JP2012112758A - Combination balance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combination weigher capable of reducing the frequency of occurrence of defective combinations and reducing the installation area.
SOLUTION: A plurality of weighing hoppers 4 capable of being selectively discharged in first and second directions, a plurality of memory hoppers 5, a collecting chute 6, and a collection conveyor 11 disposed outside the collecting chute 6 are provided. , A discharge combination is obtained from a plurality of movable chutes 9 for distributing the objects to be weighed discharged from the weighing hoppers 4 in the first direction to the collecting chute 6 and the collection conveyor 11, and from the weighing hoppers 4 and the memory hoppers 5. The weighing hopper 4 and the memory hopper 5 selected for the combination are controlled to discharge the objects to be collected to the collecting chute 6, and the weighing hopper 5 to which the objects to be weighed are to be collected is specified. The movable chute 9 is controlled so that the object to be weighed is discharged in the first direction and the object to be weighed discharged from the weighing hopper 4 in the first direction is supplied to the recovery conveyor 11. And a control device 10 for performing the above operation.
[Selection] Figure 1

Description

  The present invention relates to a combination weigher that puts a weighed object into a packaging machine or the like.

  Conventionally, an object to be weighed with a combination weigher is typically placed in a packaging machine and packed in a packaging bag or packaging container.

  In such a conventional combination weigher, for example, a collecting chute for collecting the objects to be weighed discharged from the weighing hopper and putting it into the receiving port of the packaging machine, for example, is disposed below the plurality of weighing hoppers. . Each weighing hopper weighs the supplied object to be weighed, and the control device performs a combination operation based on the measured value. One hopper combination is obtained, and this is set as a combination to be discharged (hereinafter referred to as “discharge combination”), and the measured object is discharged from the weighing hopper selected as the discharge combination. The discharged objects to be weighed slide down on the collecting chute and are introduced into, for example, a receiving port of the packaging machine.

  In such a combination weigher, for example, in the case of an object to be entangled easily, the objects to be weighed are entangled, and a large amount of objects to be weighed may be supplied to the weighing hopper. For example, a weighing hopper to which a large amount of objects to be weighed exceeding the upper limit value of the allowable range for the combination target weight is not selected as a discharge combination.

  When a package containing a predetermined number of objects to be weighed is produced, a combination of weighing hoppers in which the total number of objects to be weighed is a predetermined number is obtained as a discharge combination. In this case, as described above, when a large amount of objects to be weighed are supplied to the weighing hopper and more than a predetermined number of objects to be weighed are supplied to the weighing hopper, the weighing hopper is not selected as a discharge combination. .

  As the weighing hoppers to which the objects to be weighed are excessively supplied (hereinafter referred to as “excessive weighing hoppers”) gradually increase as described above, the number of combinations decreases, and the discharge combination cannot be obtained. That is, a combination failure occurs. Therefore, in order to eliminate an excessive amount of the weighing hopper, an object to be weighed by the excessive amount of the weighing hopper must be discharged.

  In Patent Document 1, a distribution device that distributes objects to be weighed discharged from the plurality of weighing hoppers in two directions is arranged below the plurality of weighing hoppers arranged in a straight line, and below the distribution device, A collection chute for discharging the weighing hopper's objects to be weighed selected for the discharge combination, and a chute for discharging the weighing hopper's weighing objects that have too much capacity to be weighed (hereinafter referred to as “overweight items”). A configuration in which the “discharge chute” is arranged is disclosed. In this case, the objects to be weighed discharged from the weighing hopper are distributed to the collecting chute and the overload discharging chute by the distribution device. This sorting device is not provided for each weighing hopper, but is provided for all weighing hoppers. Therefore, when discharging an object to be weighed from an excessive amount of weighing hoppers, it is selected as a discharge combination. The discharge from the weighing hopper must be temporarily stopped, which reduces the production capacity.

  Further, in Patent Document 2, as shown in FIG. 3, in order to discharge the objects to be weighed in the weighing hopper selected as the discharge combination below the weighing hopper capable of discharging the objects to be measured in two directions, to the packaging machine. A configuration is provided in which a first collective chute and a second collective chute for discharging an object to be weighed by a weighing hopper, for example, having an excessive amount of object to be weighed are disclosed. In this case, a receiving box is disposed at the discharge port of the second collecting chute, and the objects to be weighed discharged to the second collecting chute are stored in the receiving box.

JP 58-161829 A Japanese Patent Laid-Open No. 3-123232

  In the case of the configuration disclosed in Patent Documents 1 and 2 described above, it is possible to discharge the objects to be weighed in the weighing hopper which has too much capacity to be weighed. become. However, since the hopper selected as the discharge combination is only the weighing hopper, in order to improve the combination accuracy, when trying to increase the number of weighing hoppers to be combined, the circle of the arrangement shape of the weighing hopper The diameter increases and the installation area of the combination weigher increases.

  In addition, when a plurality of types of objects to be weighed are supplied and a combination of a plurality of types in which the number of objects to be weighed is determined for each type is performed, the number of hoppers to be combined is further increased. A large amount is required, and the installation area of the combination weigher becomes larger.

  The present invention has been made to solve the above-described problems, and provides a combination weigher that can reduce the frequency of occurrence of defective combinations and reduce the installation area without reducing production capacity. It is aimed.

  In order to achieve the above object, the combination weigher of the present invention is configured to be capable of selectively discharging in two directions of the first direction and the second direction after temporarily holding the supplied objects to be weighed. And a plurality of weighing hoppers for weighing the objects to be weighed, and the weighing hoppers disposed below the weighing hoppers and temporarily discharged from the weighing hoppers in the second direction. A plurality of memory hoppers to be discharged, a weighing hopper and a weighing object to be discharged in the first direction from the weighing hopper, and a weighing object to be discharged from the memory hopper. A collecting chute that collects and discharges from a lower discharge port, and a collection unit that is disposed below the weighing hopper and outside the collecting chute and collects an object to be weighed discharged in the first direction from the weighing hopper. means A plurality of sorting means provided at the upper end portion of the collecting chute corresponding to each of the weighing hoppers, and sorting the objects to be discharged from the weighing hopper in the first direction into the collecting chute and the collecting means. A combination means for obtaining a discharge combination which is a combination for discharging the held objects to be weighed onto the collecting chute from the weighing hopper and the memory hopper based on a predetermined combination condition; and a predetermined recovery Collecting hopper specifying means for specifying the weighing hopper to collect the object to be weighed based on conditions, and discharging the object to be weighed in the first direction to the weighing hopper selected as the discharge combination and discharging The memory hopper selected for the combination is controlled to discharge the object to be weighed, and the first direction is selected from the selected weighing hopper. The weighing hopper specified by the recovery hopper specifying means is further controlled by controlling the sorting means corresponding to the selected weighing hopper so that the objects to be weighed are supplied to the collecting chute. The specified object is controlled such that the object to be weighed is discharged in the first direction, and the object discharged in the first direction from the specified weighing hopper is supplied to the recovery means. Control means for controlling the sorting means corresponding to the weighing hopper.

  According to this configuration, the weighing hopper can be selectively discharged in two directions, and the objects to be discharged from the weighing hopper in the first direction corresponding to each weighing hopper can be set as a collecting chute. Since there is a distribution means that distributes to the collection means, it is possible to discharge the objects to be weighed in the weighing hopper that are not selected as a discharge combination to the collection means without lowering the production capacity, resulting in a combination failure The frequency of occurrence can be reduced. In addition to the weighing hopper, the memory hopper is provided below the weighing hopper as the hopper selected for the discharge combination, so that the installation area of the combination weigher can be reduced and the weighing accuracy can be improved.

  Further, the distribution means may be configured to have a plate-like member rotatably attached to the upper end of the collective chute and a drive means for turning the plate-like member.

  Further, the control means further gives priority to a predetermined number of objects to be weighed when the combination means does not find a discharge combination that satisfies the predetermined combination condition. The weighing hopper is selected, and the sorting means corresponding to the selected weighing hopper is controlled so that an object to be weighed discharged from the weighing hopper in the first direction is supplied to the collecting means, You may comprise so that it may control so that the to-be-measured object may be discharged to a 1st direction with respect to the said selected said weighing hopper.

  According to this configuration, when a discharge combination that satisfies a predetermined combination condition is not obtained, the weighing hopper that discharged the weighing object is discharged by discharging the weighing object of the predetermined number of weighing hoppers to the collecting means. Since a new object to be weighed is supplied, it is then possible to determine the discharge combination.

  In addition, the combination weigher of the present invention is configured so as to be able to selectively discharge in two directions, the first direction and the second direction, after temporarily holding the supplied objects to be weighed, and holds it. A plurality of weighing hoppers for weighing the objects to be weighed and each weighing hopper disposed below the weighing hoppers and temporarily holding the objects to be discharged from the weighing hoppers in the second direction; A plurality of memory hoppers configured to be selectively discharged in two directions of the second direction, the weighing hopper and the memory hopper are disposed below, and discharged from the weighing hopper in the first direction. Collecting the objects to be weighed and the objects to be weighed discharged from the memory hopper in the first direction and collecting them from the lower discharge port, and collecting the objects to be weighed discharged from the memory hopper in the second direction Recovery means to perform, predetermined Based on a combination condition, a combination means for obtaining a discharge combination which is a combination for discharging the held objects to be weighed onto the collective chute from the weighing hopper and the memory hopper, and based on a predetermined collection condition The collection hopper specifying means for specifying the weighing hopper to collect the objects to be weighed, and the weighing hopper selected as the discharge combination to discharge the objects to be weighed in the first direction and selected as the discharge combination. And controlling the memory hopper to discharge the object to be weighed in the first direction, and when the memory hopper corresponding to the weighing hopper specified by the recovery hopper specifying means is empty, the specifying The specified weighing hopper is discharged so that the measured object of the weighing hopper is discharged to the collecting means via the memory hopper. And a control means for controlling so as to discharge the objects to be weighed to the second direction with respect to said memory hoppers which path the corresponding.

  According to this configuration, the memory hopper to which the objects to be weighed are supplied from the weighing hopper can be selectively discharged in two directions, and the objects to be weighed in the memory hopper are transferred to the collecting chute and the collecting means. Since it can be sorted and discharged, the objects in the weighing hopper that are not selected as a discharge combination can be discharged to the collection means via the memory hopper without reducing the production capacity, and the frequency of occurrence of defective combinations. Can be reduced. In addition to the weighing hopper, the memory hopper is provided below the weighing hopper as the hopper selected for the discharge combination, so that the installation area of the combination weigher can be reduced and the weighing accuracy can be improved.

  Further, the control means further gives priority to a predetermined number of objects to be weighed when the combination means does not find a discharge combination that satisfies the predetermined combination condition. The memory hopper is selected, the object to be weighed is discharged to the selected memory hopper in the second direction, and the object to be weighed is supplied to the discharged memory hopper from the weighing hopper thereabove. It may be configured to control.

  According to this configuration, when a discharge combination that satisfies the predetermined combination condition is not obtained, the memory hopper that has discharged the object to be weighed is discharged to the collection means by discharging the object to be weighed from the predetermined number of memory hoppers. Since an object to be weighed is supplied from the weighing hopper and a new object to be weighed is supplied to the weighing hopper, it is possible to obtain a discharge combination next.

  In addition, the combination means may determine that the total weight of the objects to be weighed held in the hopper selected as the discharge combination from the weighing hopper and the memory hopper is a value within a predetermined weight range. The collection hopper specifying means is configured to include the weighing hopper holding the object to be weighed exceeding the upper limit value of the predetermined weight range as the predetermined collection condition. It may be configured as follows. According to this configuration, an object to be weighed in the weighing hopper that is not selected as a discharge combination can be collected.

  In addition, the combination means may determine that the total number of objects to be weighed held in the hopper selected as the discharge combination from the weighing hopper and the memory hopper matches the target combination number. The collection hopper specifying means is configured to use the weighing hopper holding the objects to be weighed exceeding the combination target number as the predetermined collection condition. May be. According to this configuration, an object to be weighed in the weighing hopper that is not selected as a discharge combination can be collected.

  Further, the weighing hopper and the memory hopper are divided into a plurality of groups to be supplied with different kinds of objects to be weighed, and the combination means is configured to discharge the objects to be weighed onto the collective chute for each of the groups. And a plurality of the collection means are provided corresponding to each group so as to collect the same kind of objects to be weighed. It may be. According to this configuration, a discharge combination for discharging a plurality of types of objects to be weighed to the collecting chute is required, and the objects to be weighed in the weighing hopper that are not selected as the discharge combination can be collected by type. .

  Further, the combination means has a predetermined target number for each group, and is held by a hopper selected as the discharge combination from the weighing hopper and the memory hopper in each group. The predetermined combination condition includes that the total number of objects to be measured coincides with the target number of the group, and the collection hopper specifying means includes the target number of the group in each of the groups. The weighing hopper holding a larger number of objects to be weighed may be configured as the predetermined collection condition. According to this configuration, a discharge combination for discharging a plurality of types of objects to be weighed to the collecting chute is required, and the objects to be weighed in the weighing hopper that are not selected as the discharge combination can be collected by type. .

  The present invention has the above-described configuration, and in the combination weigher, there is an effect that it is possible to reduce the frequency of occurrence of defective combinations and reduce the installation area without reducing the production capacity.

(A) is the schematic schematic diagram of the cross section which looked at the combination balance of the 1st Embodiment of this invention from the side, (b) looked at the combination balance of the 1st Embodiment of this invention from upper direction. FIG. (A) is a schematic side view which shows an example of the discharge path | route from the movable chute to a conveyor in the combination scale of the 1st Embodiment of this invention, and its vicinity part, (b) is the discharge path | route and its vicinity. It is a schematic front view of a part. (A) is the schematic schematic diagram of the cross section which looked at the combination balance of the 2nd Embodiment of this invention from the side, (b) looked at the combination balance of the 2nd Embodiment of this invention from upper direction. FIG. It is the schematic schematic diagram of the cross section which looked at the combination weigher of the other example in the 2nd Embodiment of this invention from the side.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout all the drawings, and redundant description thereof is omitted. Further, the present invention is not limited to the following embodiment.

(First embodiment)
FIG. 1A is a schematic schematic view of a cross section of the combination weigher according to the first embodiment of the present invention viewed from the side, and FIG. 1B is a combination weigher according to the first embodiment of the present invention. It is the schematic model which looked at from the top. Fig.1 (a) shows the cross section along the AA in FIG.1 (b).

  In the combination weigher of the present embodiment, a conical dispersion feeder 1 is provided in the center of the upper part of the apparatus to disperse an object to be weighed supplied from an external supply device (not shown) radially by vibration. Around the dispersion feeder 1, a linear feeder 2 is provided for feeding an object to be weighed sent from the dispersion feeder 1 to each supply hopper 3 by vibration. Below each of the linear feeders 2, a supply hopper 3, a weighing hopper 4, and a memory hopper 5 are provided correspondingly and arranged in a circular shape. A weighing hopper 4 is disposed below the supply hopper 3, and a memory hopper 5 is disposed obliquely below the weighing hopper 4. A collecting chute 6 is disposed below the weighing hopper 4 and the memory hopper 5, and the objects to be weighed discharged from the weighing hopper 4 and the memory hopper 5 are collected and discharged from a discharge port 6a provided at the lower portion. Below this combination weigher, for example, a packaging machine (not shown) is installed, and the objects to be weighed discharged from the discharge port 6a of the collecting chute 6 are put into the packaging machine and packed in a bag.

  The supply hopper 3 has a discharge gate 3g for temporarily holding an object to be weighed sent from the linear feeder 2 and discharging the object to be weighed to a weighing hopper 4 arranged below the object to be weighed. The weighing hopper 4 temporarily holds an object to be weighed supplied from the upper supply hopper 3 and discharges the object to be weighed in the outer direction (first direction). It has a discharge gate (inner gate) 4b for discharging in the direction (second direction), and is configured to selectively discharge the object to be measured in the outer direction and the inner direction. Here, the inside direction and the outside direction are an inside direction and an outside direction of a circle which is an arrangement shape of the weighing hopper 4. A weight sensor 4s such as a load cell is attached to the weighing hopper 4, and the weight of the object to be weighed in the weighing hopper 4 is measured by the weight sensor 4s. The measurement value of each weight sensor 4 s is output to the control device 10. The memory hopper 5 has a discharge gate 5g for temporarily holding an object to be weighed supplied from the weighing hopper 4 obliquely above and discharging the object to be weighed downward (collection chute 6).

  The combination weigher of this embodiment is a combination weigher to which a plurality of kinds of objects to be weighed are supplied. As an example, a combination weigher that mixes and weighs objects of four types (first to fourth types) is shown. For example, as shown in FIG. 1B, 16 weighing hoppers 4 and 16 memory hoppers 5 are arranged. And is grouped into a plurality of groups corresponding to the varieties of articles to be supplied. In this example, the four weighing hoppers 4 adjacent to each other and the four memory hoppers 5 arranged below the four weighing hoppers 4 are grouped into four groups of first to fourth groups G1 to G4. It is divided. Different types of objects to be weighed are supplied to each of these groups G1 to G4. In order to prevent these different types of objects to be weighed from being mixed, a partition plate 7 is disposed on the dispersion feeder 1, and a partition plate 8 is disposed between the linear feeders 2 corresponding to different groups. In addition, a supply device (not shown) for supplying an object to be weighed onto the dispersion feeder 1 allows each of four different kinds of objects to be weighed to corresponding locations partitioned by the partition plate 7 on the dispersion feeder 1. It is configured so that it can be supplied. The first group G1 and the parts corresponding thereto (the linear feeder 2 and the supply hopper 3) are supplied with the first kind of objects to be weighed. Similarly, the second group G2 and the parts corresponding thereto are supplied with the second kind of objects. A weighing object is supplied, and the third group G3 and the corresponding part are supplied with the third kind of weighing object, and the fourth group G4 and the corresponding part are supplied with the fourth kind of weighing object. .

  A movable chute 9 is provided at the upper end of the collective chute 6 corresponding to each weighing hopper 4. The movable chute 9 is rotatably attached to the upper end of the collective chute 6, and the position indicated by the solid line in FIG. 1A is a fixed position, and the objects to be weighed in the weighing hopper 4 are discharged onto the collection conveyor 11. When it does, it is rotated to the position (collection position) indicated by the chain line.

  The collection conveyor 11 is disposed outside the collective chute 6 corresponding to each group G1 to G4, and a collection container 12 is provided on one end side of each collection conveyor 11.

  2A is a schematic side view showing an example of the discharge path from the movable chute 9 to the recovery conveyor 11 and an example of the vicinity thereof, and FIG. 2B is a schematic front view of the discharge path and the vicinity thereof. It is.

  In this case, the shaft 9 a of the movable chute 9 is rotatably attached to the upper end of the collective chute 6, the operation plate 13 is attached to the shaft 9 a of the movable chute 9, and this operation plate 13 is connected to the rod of the air cylinder 14. ing. The rear end of the air cylinder 14 is supported by a member (not shown), and when the rod of the air cylinder 14 moves forward, the movable chute 9 rotates to the collection position indicated by the chain line, and the rod of the air cylinder 14 moves backward. The movable chute 9 returns to the fixed position indicated by the solid line. When the movable chute 9 becomes the collection position indicated by the chain line and the outer gate 4a of the weighing hopper 4 is opened, the object to be weighed in the weighing hopper 4 is discharged onto the movable chute 9. The movable chute 9, the operation plate 13, and the air cylinder 14 constitute a distribution means.

  Below each movable chute 9, a guide chute 15 for guiding an object to be weighed discharged onto the movable chute 9 onto a collection conveyor (collection means) 11 is disposed. The shape of each guide chute 15 differs depending on the positional relationship between each movable chute 9 and the collection conveyor 11. Further, guard plates 16 are arranged on both sides along the transport direction of the recovery conveyor 11 (the direction of the arrow S shown in FIG. 1B) so that the objects to be weighed do not jump out of the recovery conveyor 11. .

  In a state where the movable chute 9 is rotated to the collection position indicated by the chain line, the object to be weighed discharged from the weighing hopper 4 by opening the outer gate 4a slides down on the movable chute 9 and the guide chute 15 and is collected. 11 is transported in the direction of arrow S and stored in the collection container 12.

  In addition, the partition plates 7 and 8 and the collection container 12 are not illustrated in FIG. Further, in FIG. 1B, the rectilinear feeder 2, the supply hopper 3, and the guard plate 16 are not shown.

  The control device 10 functions as control means, combination means, recovery hopper specifying means, and the like. The control device 10 includes a CPU, a microcontroller having a ROM and a RAM memory in which an operation program and operation parameters of the CPU are stored, and the CPU executes the operation program stored in the ROM. Thus, the operation of the entire combination weigher is controlled and the combination process is performed. That is, the control device 10 controls the vibration operation of the dispersion feeder 1 and the linear feeder 2, and controls the opening / closing operation of the discharge gates of the supply hopper 3, the weighing hopper 4, and the memory hopper 5.

  In the combination process, the control device 10 determines the weighing hopper 4 and the memory based on the predetermined combination conditions and the weights of the objects to be weighed in the weighing hopper 4 and the memory hopper 5 measured by the respective weight sensors 4s. One combination (discharge combination) of hoppers (discharge hoppers) 4 and 5 from which the objects to be weighed are to be discharged is obtained from the hopper 5. The weight of the object to be weighed in the memory hopper 5 used in this combination processing is a weight value when measured by the weight sensor 4s in the weighing hopper 4 above it.

  Further, details of the combination processing here will be described. In this combination process, for each group G1 to G4 to which the first to fourth types of objects to be weighed are supplied, one combination of the hoppers 4 and 5 that should discharge the objects to be weighed based on a predetermined combination condition. The combination of each of the groups G1 to G4 is determined as a discharge combination. Here, before the start of operation, the unit weight setting value (the set weight value of one object to be weighed) of each kind of the first kind to the fourth kind and each kind of the first kind to the fourth kind These target numbers and target weights are stored in advance in a memory in the control device 10.

  For example, the unit weight setting value of the objects to be weighed for the first to third varieties is 5 g, the target number of each varieties of the first to third varieties is 5 and the target weight is 25 g. The unit weight setting value of the object to be weighed is set to 3 g, the target number of the fourth type is set to 8, and the target weight is set to 24 g.

  For example, the linear feeders corresponding to the weighing hoppers 4 are supplied to the weighing hoppers 4 of the first to third groups G1 to G3 so that one to-be-measured item corresponding to each group is supplied one by one. Operations such as 2 are controlled. Further, the operation of the linear feeder 2 corresponding to each weighing hopper 4 of the fourth group G4 is controlled so that each weighing hopper 4 of the fourth group G4 is supplied with two pieces of the fourth kind of weighing objects. Has been. Even if it is controlled in this way, one weighing object is not necessarily supplied to each weighing hopper 4 of the first to third groups G1 to G3. May be supplied. Similarly, two weighing objects are not necessarily supplied to each weighing hopper 4 of the fourth group G4, and one or three or more weighing objects may be supplied.

  In the combination process, for example, when the control device 10 obtains the combination of the first group G1, the control object 10 is provided with the weighing objects held in the hoppers 4 and 5 of the first group G1 to which the first kind of weighing objects are supplied. The number of objects to be weighed held in the hoppers 4 and 5 is calculated based on the weight and the unit weight setting value of the first kind of objects to be weighed, and the total number of objects to be weighed is the first. One combination of hoppers 4 and 5 that matches the target number of one type is obtained and set as the combination of the first group G1. When there are a plurality of combinations of the hoppers 4 and 5 in which the total number of the objects to be weighed matches the target number of the first type, the total weight of the items to be weighed and the first type The combination having the smallest absolute value of the difference from the target weight is set as the combination of the first group G1. The number of objects to be weighed held in the hoppers 4 and 5 is obtained by dividing the weight of the objects to be weighed held in the hoppers 4 and 5 by the unit weight setting value of the first kind of objects to be weighed. Calculate by rounding to the nearest whole number.

  The combination of each of the second to fourth groups G2 to G4 is obtained in the same manner as the case of obtaining the combination of the first group G1. And the control apparatus 10 makes the combination of the hoppers 4 and 5 which combined the combination of all the four groups G1-G4 a discharge combination.

  In other words, the combination condition here is that the total number of objects to be weighed in each group is the same for the hoppers 4 and 5 that match the target number of the group (the target number of varieties supplied to the group). It is a combination.

  Next, the operation of the combination weigher of this embodiment will be described. The operation of the entire combination weigher is controlled by the control device 10.

  First, an object to be weighed that has been conveyed by a supply device (not shown) is placed on the dispersion feeder 1. Then, it is dispersed radially by the vibration of the dispersion feeder 1 and sent to each linear feeder 2. Further, the linear feeder 2 is vibrated by the vibration of the linear feeder 2, is discharged from the distal end of the linear feeder 2, is supplied to the supply hopper 3, is further supplied to the weighing hopper 4 below, and is supplied from the weighing hopper 4. It is supplied to the memory hopper 5. Here, when the supply hopper 3 corresponding to each linear feeder 2 is empty, the objects to be weighed are supplied from the linear feeder 2 to the supply hopper 3. In addition, when the weighing hopper 4 positioned below each supply hopper 3 is empty, the objects to be weighed are supplied from the supply hopper 3 to the weighing hopper 4. Then, after the weighing object is weighed by each weighing hopper 4, the weighing object is supplied from the weighing hopper 4 to the memory hopper 5 when the memory hopper 5 located obliquely below the weighing hopper 4 is empty. The

  Further, after the weight of the object to be weighed is measured by the weighing hopper 4, the control device 10 obtains the discharge combination by performing the above-described combination processing, for example, receives the input command signal from the packaging machine, and selects the discharge combination. The discharge gates 4a and 5g of the hoppers 4 and 5 are opened and closed to discharge the objects to be weighed onto the collecting chute 6. The discharged objects to be weighed slide down on the collecting chute 6 and are fed into the packaging machine through the discharge port 6a. Here, the movable chute 9 corresponding to at least the weighing hopper 4 selected as the discharge combination is located at a fixed position indicated by a solid line.

  When the weighing hopper 4 above the memory hopper 5 that has become empty after the weighing object is discharged, the control device 10 supplies the weighing object to the memory hopper 5. Thus, the discharge gate 4b of the corresponding weighing hopper 4 is opened and closed. The weighing hopper 4 that has supplied the objects to be weighed to the memory hopper 5 and the weighing hopper 4 that has been emptied after being discharged onto the collecting chute 6 are supplied with the objects to be weighed from the supply hopper 3 thereabove. Then, the discharge gate 3g of the corresponding supply hopper 3 is opened and closed, and after the predetermined weighing stabilization time (output stabilization time of the weight sensor 4s) has elapsed, the weight of the weighing object in the weighing hopper 4 is measured, and the following combination processing I do. By repeating a series of processes in this way, the objects to be weighed are sequentially put into the packaging machine and bagging is performed. The linear feeder 2 and the dispersion feeder 1 are controlled by the control device 10 so that the objects to be weighed are supplied to the supply hopper 3 that has supplied the objects to be weighed to the weighing hopper 4.

  Further, in the present embodiment, every time the combination process is performed, the control device 10 determines whether or not there is a weighing hopper 4 that satisfies a predetermined collection condition for each of the groups G1 to G4. When there is such a weighing hopper 4, the weighing hopper 4 is determined as a hopper to collect the object to be weighed (hereinafter referred to as “collected weighing hopper 4”). Then, the movable chute 9 corresponding to the collection weighing hopper 4 is rotated to the collection position indicated by the chain line, the discharge gate 4a of the collection weighing hopper 4 is opened to discharge the object to be measured, and the collection conveyor 11 is driven. Here, the object to be weighed discharged from the collection and weighing hopper 4 slides down on the movable chute 9 and the guide chute 15 and is placed on the collection conveyor 11 and conveyed in the direction of arrow S in FIG. Collected in twelve. The object to be weighed is supplied from the supply hopper 3 to the recovery weighing hopper 4 which has discharged the object to be weighed.

The said collection conditions are defined about each group G1-G4. For example, for an arbitrary group, for example, the number of objects to be weighed held by the weighing hopper 4 exceeds the target number (N) of the group to which the weighing hopper 4 belongs. In other words, the number of objects to be weighed held by the weighing hopper 4 of the group is (N + 1) or more. That the number of objects to be weighed is (N + 1) or more,
Wa = Ws × (N + 1)
This is equivalent to the weight of the object to be weighed held by the weighing hopper 4 being equal to or greater than the predetermined weight Wa. Ws is a unit weight setting value of the product to be weighed supplied to the group to which the weighing hopper 4 belongs.

  The discharge of the object to be weighed from the weighing hopper 4 selected as the discharge combination and the discharge of the object to be weighed from the recovery weighing hopper 4 may be performed at the same time, or the timing may be different. .

  Further, in the present embodiment, the control device 10 measures a predetermined number (for example, two) when the combination processing is performed and a discharge combination that satisfies the combination condition is not obtained, that is, when a combination failure occurs. The object to be weighed in the hopper 4 is discharged onto the collection conveyor 11 and collected in the collection container 12 in the same manner as in the case of the collection and weighing hopper 4 described above. For example, as described above, when the target number of the first type is an odd number (for example, five), when the even number of objects to be weighed is supplied to all the hoppers 4 and 5 of the first group G1. The combination of the first group G1 cannot be obtained, and the discharge combination cannot be obtained. In such a case, for example, a predetermined number of weighing hoppers 4 of the first group G1 for which no combination has been obtained are selected, and the movable chute 9 corresponding to the selected weighing hopper 4 is rotated to the collection position, thereby The outer gate 4a of the selected weighing hopper 4 is opened and closed to discharge the object to be weighed. Here, as the weighing hopper 4 to be selected, for example, a weighing object having a large weight to be weighed is preferentially selected.

  In the present embodiment, the weighing hopper 4 is configured to be able to selectively discharge an object to be measured in two directions, the inner direction and the outer direction, and discharged from the weighing hopper 4 to the outer direction corresponding to each weighing hopper 4. Since the movable chute 9 is provided to distribute the objects to be weighed to the collecting chute 6 and the collection conveyor 11, the objects to be weighed in the weighing hopper 4 that are not selected as a discharge combination without reducing the production capacity Can be discharged to the collection conveyor 11, and the frequency of occurrence of defective combinations can be reduced. In addition to the weighing hopper 4, the memory hopper 5 is provided below the weighing hopper 4 as the hopper selected for the discharge combination, so that the installation area of the combination weigher can be reduced and the weighing accuracy can be improved.

  Furthermore, since the collection conveyor 11 and the collection container 12 are provided for each group (G1 to G4) to which the objects to be weighed of each kind are supplied, the objects to be weighed are collected according to the kinds. This eliminates the need to divide the product by product type, and makes it easier to reuse the collected objects.

  Further, when a combination failure occurs, a new number of objects to be weighed are supplied to the discharged weighing hopper 4 by discharging the objects to be weighed from a predetermined number of the weighing hoppers 4 onto the collection conveyor 11, and weighed it. In the combination process performed later, it becomes possible to obtain the discharge combination.

(Second Embodiment)
FIG. 3A is a schematic sectional view of the combination weigher according to the second embodiment of the present invention viewed from the side, and FIG. 3B is the combination weigher according to the second embodiment of the present invention. It is the schematic model which looked at from the top. Fig.3 (a) shows the cross section along the BB line in FIG.3 (b). 3A and 3B, the same or corresponding parts as those in FIGS. 1A and 1B are denoted by the same reference numerals, and the description thereof is omitted.

  In the combination weigher of the first embodiment, the objects to be weighed in the collection weighing hopper 4 from which the objects to be weighed are collected are directly collected from the collection weighing hopper 4, whereas in the present embodiment, the collection weighing hopper 4 In this configuration, the data is collected from the memory hopper 5. In the configuration shown in FIGS. 3A and 3B of the present embodiment, the memory hopper 5 is disposed obliquely outward and downward with respect to the weighing hopper 4, and the outer gate 4 a of the weighing hopper 4 is opened and closed to thereby open the weighing hopper 4. An object to be weighed is supplied to the memory hopper 5. The memory hopper 5 is provided with an outer gate 5 a and an inner gate 5 b that can be opened and closed independently as discharge gates, and a guide chute 15 is provided corresponding to each memory hopper 5. The guide chute 15 is connected to the upper end of the collective chute 6 and is provided to guide the objects to be weighed discharged from the memory hopper 5 outwardly onto the collection conveyor 11. When the outer gate 5a is opened and closed, the object to be weighed in the memory hopper 5 slides down on the guide chute 15 and is discharged onto the collection conveyor 11 and collected in the collection container 12. Moreover, the objects to be weighed in the memory hopper 5 are discharged onto the collecting chute 6 by opening and closing the inner gate 5b. In addition, a chute 21 is disposed obliquely downward on the inner side with respect to each weighing hopper 4. The weighing hopper 4 discharges the object to be weighed to the memory hopper 5 when the outer gate 4a opens and closes, and discharges it onto the collecting chute 6 via the chute 21 when the inner gate 4b opens and closes. Note that the chute 21 may not be provided, but by providing the chute 21, damage to the objects to be weighed discharged from the weighing hopper 4 onto the collecting chute 6 can be prevented.

  In the present embodiment, the control device 10 controls the operation of the entire combination weigher and performs the same combination process as in the first embodiment. For the hoppers 4 and 5 selected as the discharge combination obtained in the combination process, the inner gates 4b and 5b are opened and closed, and the collective chute 6 discharges the objects to be weighed.

  Moreover, the control apparatus 10 determines whether there exists the collection | recovery measurement hopper 4 whenever it performs a combination process similarly to the case of 1st Embodiment. Here, when there is the collection weighing hopper 4, the memory hopper 5 below it is selected as the discharge combination, and after the objects to be weighed in the memory hopper 5 are discharged to the collecting chute 6, The outer gate 4a is opened and closed, and the outer gate 5a of the memory hopper 5 therebelow is opened and closed. As a result, the objects to be weighed in the collection weighing hopper 4 are discharged onto the collection conveyor 11 via the memory hopper 5. The object to be weighed is supplied from the supply hopper 3 to the recovery weighing hopper 4 which has discharged the object to be weighed.

  Further, when a combination failure occurs, the control device 10 discharges a predetermined number (for example, two) of the objects to be weighed in the memory hopper 5 onto the collection conveyor 11 and collects them in the collection container 12. The memory hopper 5 that has been discharged is supplied with the objects to be weighed from the weighing hopper 4 thereabove, and new objects to be weighed are supplied to the weighing hopper 4. A combination can be determined.

  In the present embodiment, an outer gate 5a and an inner gate 5b are provided in the memory hopper 5 to which the objects to be weighed are supplied from the weighing hopper 4, and the objects to be weighed in the memory hopper 5 are transferred to the collecting chute 6 and the collection conveyor 11. Since it is configured so that it can be sorted and discharged, an excessive amount of objects to be weighed in the collection and weighing hopper 4 that are not selected as a discharge combination without reducing the production capacity are collected via the memory hopper 5 through the collection conveyor 11. The frequency of occurrence of defective combinations can be reduced. In addition to the weighing hopper 4, the memory hopper 5 is provided below the weighing hopper 4 as the hopper selected for the discharge combination, so that the installation area of the combination weigher can be reduced and the weighing accuracy can be improved.

  Further, as in the first embodiment, the collection conveyor 11 and the collection container 12 are provided for each group (G1 to G4) to which the articles to be weighed are supplied, and the articles to be weighed are collected by kind. Therefore, there is no need to separate the collected objects to be measured according to the varieties, and the collected objects to be measured can be easily reused.

  FIG. 4 is a schematic cross-sectional schematic view of another example combination weigher according to the second embodiment viewed from the side.

  In the configuration of FIG. 4, the guide chute 15 and the recovery conveyor 16 are not provided as in FIG. 3, and the memory hopper 5 is provided obliquely below the inner side of the weighing hopper 4, and the recovery pipe ( Recovery means) 22 is provided. The weighing hopper 4 discharges the object to be weighed onto the collecting chute 6 when the outer gate 4a opens and closes, and discharges it to the memory hopper 5 when the inner gate 4b opens and closes. Further, the memory hopper 5 discharges the object to be weighed onto the collecting chute 6 when the outer gate 5a opens and closes and discharges it to the collection pipe 22 when the inner gate 5b opens and closes. The recovery pipes 22 are provided corresponding to the respective memory hoppers 5 and are configured to guide the objects to be weighed that pass through the collecting chute 6 and are discharged inward from the memory hoppers 5 to the recovery container 12. Similar to the case of FIG. 3, a collection container 12 is provided for each of the groups G1 to G4, and the objects to be weighed are collected for each type. Here, each recovery pipe 22 is provided corresponding to one memory hopper 5, but the upper opening of the recovery pipe 22 is widened to correspond to a plurality of adjacent memory hoppers 5 in the same group. Two recovery pipes 22 may be provided.

  The control device 10 in FIG. 4 performs combination processing and determines whether or not there is the collection weighing hopper 4 in the same manner as the control device 10 in FIG. 3. In the configuration of FIG. 4, for the hoppers 4 and 5 selected as the discharge combination, the outer gates 4 a and 5 a are opened and closed, and the objects to be weighed are discharged to the collecting chute 6. If there is a collection weighing hopper 4, the memory hopper 5 below it is selected as the discharge combination, and after the objects to be weighed in the memory hopper 5 are discharged to the collecting chute 6, The gate 4b is opened and closed, and the inner gate 5b of the memory hopper 5 below the gate 4b is opened and closed. As a result, the objects to be weighed in the collection weighing hopper 4 are discharged to the collection pipe 22 via the memory hopper 5. The object to be weighed is supplied from the supply hopper 3 to the recovery weighing hopper 4 which has discharged the object to be weighed.

  Also with the configuration of FIG. 4, the same effects as the configuration of FIG. 3 can be obtained.

  The combination weighers of the first and second embodiments are configured such that a plurality of types of objects to be weighed are supplied and combined to be discharged. It may be configured to be supplied and discharged. The combination process in this case is the same as, for example, the case of obtaining a combination of one group in the combination process in the above embodiment, and from among all the hoppers 4 and 5 in which the weight of the object to be weighed is measured, One combination in which the total number of objects to be weighed matches the target number (combination target number) is determined, and this is set as the discharge combination. In this case, for example, the weighing hopper 4 holding the objects to be weighed exceeding the combination target number may be used as the collection weighing hopper.

  In addition, the combination process in the case where a single kind of objects to be weighed is supplied and discharged may be as follows. For example, out of all the hoppers 4 and 5 in which the weight of the object to be weighed is measured, one combination in which the total weight of the objects to be weighed falls within a predetermined weight range (allowable range for the combination target weight) is obtained. Make it a discharge combination. In this case, for example, the weighing hopper 4 holding the object to be weighed exceeding the upper limit value of the predetermined weight range may be used as the collection weighing hopper. Alternatively, the weighing hopper 4 that holds an object to be weighed of a predetermined weight Wm or more out of the weighing hoppers 4 not selected as the discharge combination may be used as the collection weighing hopper. Here, the predetermined weight Wm is set to a value which is not more than the upper limit value of the predetermined weight range and greatly exceeds the target supply amount of the weighing hopper 4. For example, the predetermined weight Wm may be set to a weight value twice the target supply amount of the weighing hopper 4. In such a case, in addition to the weighing hopper that is not selected as the discharge combination, the collection hopper 4 is selected as the weighing hopper that is difficult to be selected as the discharge combination.

  In addition, in the case where a plurality of types of objects to be weighed are supplied and combined to be discharged as in the first and second embodiments, in each group, One combination in which the total weight of the objects to be weighed is closest to the target weight may be obtained from the hoppers 4 and 5 that are weighed, and the combination of these groups may be combined into a discharge combination. . Further, in this case, in each group, for example, the weighing hopper 4 holding an object to be weighed that greatly exceeds the target weight may be used as the collection weighing hopper.

  In the first and second embodiments, a combination weigher having a configuration in which a plurality of weighing hoppers 4 and a plurality of memory hoppers 5 are arranged in a circular shape has been described. However, the present invention is not limited to this. For example, a combination weigher having a configuration in which a plurality of weighing hoppers 4 and a plurality of memory hoppers 5 are arranged in a straight line may be used.

  In the first and second embodiments, the control device 10 is configured by, for example, a microcontroller or the like. However, the control device 10 may be configured by a single control device that performs centralized control, or may be distributed in cooperation with each other. You may be comprised by the some control apparatus to control.

  INDUSTRIAL APPLICABILITY The present invention is useful as a combination weigher or the like that can reduce the frequency of occurrence of defective combinations and reduce the installation area without reducing production capacity.

4 Weighing hoppers 4a, 4b Discharge gate 4s Weight sensor 5 Memory hoppers 5a, 5b, 5g Discharge gate 6 Collecting chute 7, 8 Partition plate 9 Moving chute 10 Control device 11 Recovery conveyor 12 Recovery container 15 Guide chute 22 Recovery pipe

Claims (9)

A plurality of units that are configured to be capable of selectively discharging in two directions, the first direction and the second direction, after temporarily holding the supplied objects to be weighed, and weighing the weight of the objects to be held A weighing hopper,
A plurality of memory hoppers disposed under each of the weighing hoppers and temporarily holding and discharging the objects to be discharged from the weighing hoppers in the second direction;
The objects to be weighed are disposed below the weighing hopper and the memory hopper and discharged from the weighing hopper in the first direction and the objects to be weighed discharged from the memory hopper are collected and discharged from the lower discharge port. A collective chute
A collecting means disposed below the weighing hopper and outside the collective chute for collecting an object to be weighed discharged from the weighing hopper in the first direction;
A plurality of sorting means provided at the upper end portion of the collecting chute corresponding to each of the weighing hoppers, and sorting the objects to be discharged from the weighing hopper in the first direction into the collecting chute and the collecting means; ,
A combination means for obtaining a discharge combination which is a combination for discharging a held object to be weighed onto the collective chute from the weighing hopper and the memory hopper based on a predetermined combination condition;
A collection hopper specifying means for specifying the weighing hopper to collect an object to be weighed based on a predetermined collection condition;
The weighing hopper selected for the discharge combination is discharged to the weighing hopper in the first direction, and the memory hopper selected for the discharge combination is controlled to be discharged. Controlling the sorting means corresponding to the selected weighing hopper so that the objects to be weighed discharged in the first direction from the selected weighing hopper are supplied to the collecting chute, The weighing hopper specified by the recovery hopper specifying means is controlled to discharge the weighing object in the first direction, and the weighing object discharged in the first direction from the specified weighing hopper is the A combination weigher comprising control means for controlling the sorting means corresponding to the specified weighing hopper so as to be supplied to the collecting means.   2. The combination weigher according to claim 1, wherein the distribution unit includes a plate-like member rotatably attached to an upper end of the collective chute and a drive unit that rotates the plate-like member.   The control means is further configured to give priority to a predetermined number of the weighing objects when the combination means does not find a discharge combination that satisfies the predetermined combination condition, and gives priority to the weight of the object to be weighed being large. The hopper is selected, and the sorting means corresponding to the selected weighing hopper is controlled so that the objects to be weighed discharged from the weighing hopper in the first direction are supplied to the collecting means, and the selection The combination weigher according to claim 1, wherein the weighing hopper is configured to control the weighing object to be discharged in a first direction. A plurality of units that are configured to be capable of selectively discharging in two directions, the first direction and the second direction, after temporarily holding the supplied objects to be weighed, and weighing the weight of the objects to be held A weighing hopper,
Each of the weighing hoppers disposed below the weighing hopper and temporarily discharged from the weighing hopper in the second direction can be selectively discharged in two directions, the first direction and the second direction. A plurality of memory hoppers configured as described above,
The weighing hopper and the memory hopper are arranged below the weighing hopper, and the objects to be weighed discharged from the weighing hopper in the first direction and the objects to be weighed discharged from the memory hopper in the first direction are assembled to form a lower part. A collective chute to be discharged from the discharge port;
A collection means for collecting the objects to be weighed discharged in the second direction from the memory hopper;
A combination means for obtaining a discharge combination which is a combination for discharging a held object to be weighed onto the collective chute from the weighing hopper and the memory hopper based on a predetermined combination condition;
A collection hopper specifying means for specifying the weighing hopper to collect an object to be weighed based on a predetermined collection condition;
The weighing object selected in the discharge combination is discharged in the first direction with respect to the weighing hopper, and the measured object is discharged in the first direction with respect to the memory hopper selected in the discharge combination. And when the memory hopper corresponding to the weighing hopper specified by the collection hopper specifying means is empty, the object to be weighed in the specified weighing hopper is passed through the memory hopper to the collecting means. A combination weigher comprising: a control unit that controls the specified weighing hopper and the corresponding memory hopper to discharge an object to be measured in a second direction.   The control means is further configured to prioritize a weight of the object to be weighed being large when the combination means does not find a discharge combination that satisfies the predetermined combination condition. A hopper is selected, and the object to be weighed is discharged to the selected memory hopper in the second direction, and the object to be weighed is supplied to the discharged memory hopper from the weighing hopper thereabove. The combination weigher according to claim 4, configured as described above. The combination means determines that the total weight of the objects to be weighed held in the hopper selected as the discharge combination from the weighing hopper and the memory hopper becomes a value within a predetermined weight range. Configured to include in the condition,
The said collection | recovery hopper specific | specification means was comprised so that it might be said predetermined | prescribed collection | recovery conditions that it is the said measurement hopper holding the to-be-measured object of the weight exceeding the upper limit of the said predetermined weight range. The combination weigher according to any one of 5. The combination means uses the predetermined combination condition that a total number of objects to be weighed held in a hopper selected as the discharge combination from the weighing hopper and the memory hopper matches a target combination number. Configured to include
The said collection | recovery hopper specific | specification means was comprised so that it might be said predetermined | prescribed collection | recovery conditions that it is the said measurement hopper holding the number of to-be-measured objects exceeding the said combination target number. A combination scale according to any one of the above. The weighing hopper and the memory hopper are divided into a plurality of groups to which different types of objects to be weighed are supplied,
The combination means is configured to obtain a combination for discharging the objects to be weighed onto the collective chute for each of the groups, and to determine the discharge combination that is a combination of all the groups.
6. The combination weigher according to any one of claims 1 to 5, wherein a plurality of the collecting means are provided corresponding to each of the groups so as to collect an object of the same kind. In the combination means, a target number of each group is determined in advance, and an object to be weighed held in a hopper selected as the discharge combination from the weighing hopper and the memory hopper in each group. And the predetermined combination condition includes that the total number of the same number matches the target number of the group,
The collection hopper specifying means is configured to make the predetermined collection condition that each of the groups is the weighing hopper holding the objects to be weighed exceeding the target number of the group. The combination weigher according to claim 8.

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