CN219416423U - Bulk material balance calibration device - Google Patents
Bulk material balance calibration device Download PDFInfo
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- CN219416423U CN219416423U CN202320499892.9U CN202320499892U CN219416423U CN 219416423 U CN219416423 U CN 219416423U CN 202320499892 U CN202320499892 U CN 202320499892U CN 219416423 U CN219416423 U CN 219416423U
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Abstract
The utility model discloses a calibration device for a bulk material scale, which comprises: a frame body; the weighing bin is arranged on the frame body, the weighing bin is connected with the frame body through a first weighing sensor group, the weighing bin is provided with a first discharge hole, and a first discharge door capable of opening or closing the first discharge hole is arranged at the first discharge hole; the check bin is arranged on the frame body and corresponds to the first discharge port of the weighing bin, so as to receive materials from the weighing bin, the check bin is connected with the frame body through a second weighing sensor group, the check bin is provided with a second discharge port, and a second discharge door capable of opening or closing the second discharge port is arranged at the second discharge port. The checking device for the bulk material scale can adapt to the requirement of quick checking of the bulk material scale, check at any required time in real time and ensure the continuity of equipment use.
Description
Technical Field
The utility model relates to the technical field of metering detection of bulk material scales, which comprises bulk material scales applied to ports and grain and oil, in particular to a calibration device of the bulk material scales.
Background
Bulk material scales in the current market are generally large in tonnage and are arranged in a factory building in a cross-layer mode. When the bulk material balance is used, if the weighing accuracy is required to be confirmed, the bulk material balance is checked. The common calibration method of the bulk material balance is as follows: the method comprises the following steps: standard weight verification method. In the process of loading and unloading weights, the method consumes a great deal of manpower, material resources and time. The second method is as follows: constant load physical verification method. The method needs to prepare a large amount of measured bulk materials, and the result is compared after the bulk materials are weighed by a bulk material scale, so that the method has long preparation time and inconvenient turnover.
The two methods are both online verification of the bulk material balance, the production rhythm is required to be interrupted in the verification process, and the verification process is complex, time-consuming and labor-consuming. Therefore, after the bulk material balance is initially calibrated and put into operation, the calibration is basically not performed any more, and after long-time operation, the metering precision cannot be ensured, so that the production is greatly influenced.
The information disclosed in this background section is only for enhancement of understanding of the general background of the utility model and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The utility model aims to provide a bulk material balance calibration device which can meet the requirement of quick calibration of a bulk material balance, can immediately calibrate at any required time and can ensure the use consistency of equipment.
To achieve the above object, an embodiment of the present utility model provides a bulk material balance calibration device, including:
a frame body;
the weighing bin is arranged on the frame body, the weighing bin is connected with the frame body through a first weighing sensor group, the weighing bin is provided with a first discharge hole, and a first discharge door capable of opening or closing the first discharge hole is arranged at the first discharge hole;
the check bin is arranged on the frame body and corresponds to the first discharge port of the weighing bin, so as to receive materials from the weighing bin, the check bin is connected with the frame body through a second weighing sensor group, the check bin is provided with a second discharge port, and a second discharge door capable of opening or closing the second discharge port is arranged at the second discharge port.
In one or more embodiments of the utility model, the verification bin is supported on the frame by the second set of weighing sensors.
In one or more embodiments of the utility model, the second set of weighing sensors comprises a plurality of shear beam sensors or a plurality of digital sensors.
In one or more embodiments of the utility model, the weigh bin is suspended from the frame by the first set of weigh sensors.
In one or more embodiments of the utility model, the first set of weighing sensors includes a plurality of s-type pull sensors.
In one or more embodiments of the utility model, the weigh bin is supported on the frame by the first set of weigh sensors.
In one or more embodiments of the utility model, the first set of weighing sensors comprises a plurality of shear beam sensors or a plurality of digital sensors.
In one or more embodiments of the present utility model, the checking bin is disposed below the weighing bin, and a feed inlet of the checking bin is disposed corresponding to the first discharge port.
In one or more embodiments of the present utility model, the projection of the first discharge port of the weighing bin in the gravity direction falls into the second discharge port of the verification bin.
In one or more embodiments of the present utility model, the bulk material balance calibration device further includes a buffer bin disposed on the frame, the buffer bin having a third discharge port, and a third discharge door capable of opening or closing the third discharge port is disposed at the third discharge port; the weighing bin is arranged corresponding to the third discharge hole of the buffering bin so as to receive materials from the buffering bin.
In one or more embodiments of the present utility model, the weighing bin is disposed below the buffer bin, and a feed inlet of the weighing bin is disposed corresponding to the third discharge port.
In one or more embodiments of the present utility model, the bulk material balance checking device further includes a control cabinet, and the control cabinet is connected to the first weighing sensor group, the second weighing sensor group, the first discharging door, the second discharging door, and the third discharging door.
In one or more embodiments of the present utility model, the frame is configured as a tank structure, and the weighing bin and the verification bin are both located within the tank structure.
The utility model also provides a calibration method based on the bulk material balance calibration device, which comprises the following steps:
acquiring first material weight information of materials transferred from a weighing bin to a checking bin;
acquiring second material weight information of the material acquired by the checking bin;
and comparing the difference value of the first material weight information and the second material weight information with a preset value.
In one or more embodiments of the present utility model, the step of obtaining the first material weight information of the material transferred from the weighing bin to the verification bin includes:
acquiring first weighing bin weight information of a weighing bin with materials through a first weighing sensor group;
acquiring second weighing bin weight information of the weighing bin after transferring the materials through a first weighing sensor group;
and calculating and obtaining a difference value between the weight information of the first weighing bin and the weight information of the second weighing bin so as to obtain first material weight information of the material transferred from the weighing bin to the checking bin.
In one or more embodiments of the present utility model, the step of obtaining the second material weight information of the material obtained by the verification bin includes:
acquiring the weight information of a first checking bin of the checking bin without materials through a second weighing sensor group;
acquiring second check bin weight information of the check bins after receiving the materials through a second weighing sensor group;
and calculating and obtaining the difference value between the weight information of the first checking bin and the weight information of the second checking bin so as to obtain the weight information of the second material of the material obtained by the checking bin.
In one or more embodiments of the present utility model, if the difference between the first material weight information and the second material weight information is within the preset value, no alarm is generated, otherwise, an alarm is generated.
In one or more embodiments of the utility model, the means for alerting includes one or more of an audible alert, a light alert, a display alert.
In one or more embodiments of the present utility model, the information acquired by the first weighing sensor group and the second weighing sensor group is transmitted to a terminal in a wireless or wired manner.
Compared with the prior art, the bulk material balance calibration device can adapt to the requirement of quick calibration of the bulk material balance, can immediately calibrate at any required time, and can ensure the continuity of equipment use.
According to the bulk material balance checking device, the checking bin is additionally arranged below the weighing bin, so that the bulk material balance checking device can check timely at any required time, and can also be used for temporarily replacing the weighing bin to work when the weighing bin fails, so that the continuity of equipment use (no shutdown) is ensured. No transition link is added between the weighing bin and the checking bin, so that the checking accuracy of the checking bin is improved.
According to the bulk material balance calibration device, the calibration bin adopts pressure type weighing, so that the measurement is more accurate, and the calibration result is more accurate.
According to the bulk material balance calibration device, the material object calibration is replaced by the calibration bin, so that the material object turnover and waste are reduced; through setting up the check-up feed bin and substituting the weight check-up, reduce the influence of personnel's operation to the check-up, reduce the intensity of labour of personnel's operation.
According to the calibration method of the bulk material balance calibration device, the weighing weight values are directly compared, the result is more accurate, and waiting is not needed.
According to the calibration method of the bulk material balance calibration device, the weight of the materials to be weighed is obtained by measuring the weighing bin with the materials and then measuring the weighing bin after the materials are weighed; meanwhile, the weight of the received material is obtained by measuring an empty checking bin and then measuring a checking bin for receiving the material, and the weight difference value of the two weight difference values is compared to check the weighing bin, so that the accuracy of measurement and check is ensured.
The calibration method of the bulk material balance calibration device can realize remote calibration, and the calibration result participates in enterprise digital management.
Drawings
FIG. 1 is a schematic diagram of a bulk material balance calibration device according to an embodiment of the present utility model;
fig. 2 is a flowchart of a calibration method of the bulk material balance calibration device according to an embodiment of the present utility model.
Fig. 3 is a flowchart of a calibration method of the bulk material balance calibration device according to an embodiment of the present utility model.
Fig. 4 is a flowchart of a calibration method of the bulk material balance calibration device according to an embodiment of the present utility model.
Detailed Description
The following detailed description of embodiments of the utility model is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the utility model is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.
As to the background art, in the prior art, a standard weight calibration method or a constant load real object calibration method is generally adopted for calibration, but the two calibration methods are required to interrupt the production rhythm, and the calibration process is tedious, time-consuming and labor-consuming.
In order to solve the technical problems, the utility model creatively provides a bulk material balance calibration device and a calibration method thereof, which can adapt to the requirement of quick calibration of a bulk material balance, can immediately calibrate at any required time, and can ensure the continuity of equipment use.
As shown in fig. 1, the bulk material balance checking device according to an embodiment of the present utility model includes a frame 10, a weighing bin 20, a first weighing sensor group 30, a checking bin 40, and a second weighing sensor group 50. The weighing bin 20 is arranged on the frame body 10, and the weighing bin 20 is connected with the frame body 10 through a first weighing sensor group 30. The weigh bin 20 has a first discharge opening 21. The checking bin 40 is disposed on the frame 10 and corresponds to the first discharge port 21 of the weighing bin 20, so as to receive the material from the weighing bin 20. The checking bunker 40 is connected with the frame body 10 through a second weighing sensor group 50.
The frame 10 may be provided in a can structure, which may include a round can or a square can. The weighing bin 20 and the checking bin 40 are both located in the tank structure.
The weighing bin 20 is suspended on the frame body 10 by a first weighing sensor group 30, wherein the first weighing sensor group 30 may comprise a plurality of s-shaped pull sensors. Illustratively, a mounting portion 11 is disposed in the frame 10, one end of the s-shaped pull sensor is fixed on the mounting portion 11, and the other end is fixed on the weighing bin 20, so that the weighing bin 20 is suspended relative to the frame 10.
The weighing bins 20 are arranged in a funnel shape. Preferably, the sidewall of the weigh bin 20 is inclined at an angle of 30-60 ° to the horizontal. The weighing bin 20 comprises a first feed inlet 22, the first feed inlet 22 and a first discharge outlet 21 are oppositely arranged in the gravity direction of the weighing bin 20, and a first discharge door 23 capable of opening or closing the first discharge outlet 21 is arranged at the first discharge outlet 21 of the weighing bin 20.
The verification bin 40 is disposed below the weigh bin 20. The verification bin 40 is supported on the frame 10 by a second set of weighing sensors 50, wherein the second set of weighing sensors 50 includes a plurality of shear beam sensors or a plurality of digital sensors. Illustratively, the mounting portion 11 is disposed in the frame 10, the shear beam sensor or digital sensors are disposed on the mounting portion 11, the supporting portion 41 is disposed on the outer surface of the calibration bin 40, and the supporting portion 41 is disposed on the shear beam sensor or digital sensors. The calibration bin 40 is supported on the mounting portion 11 of the frame 10 through the supporting portion 41 thereof, and is supported on the frame 10, so that the second weighing sensor group 50 can accurately weigh the weight of the calibration bin 40 and the materials therein.
The verification feed bin 40 is likewise funnel-shaped. Preferably, the sidewall of the calibration silo 40 is inclined at an angle of 30-60 deg. to the horizontal. The checking silo 40 has a second discharge port 43 and a second feed port 42, the second feed port 42 and the second discharge port 43 are disposed opposite to each other in the gravity direction of the checking silo 40, and the second feed port 43 of the checking silo 40 is disposed corresponding to the first discharge port 21 of the weighing silo 20. A second discharging door 44 capable of opening or closing the second discharging hole 43 is arranged at the second discharging hole 43 of the checking bunker 40.
When the checking bin 40 does not participate in checking, the second discharging hole 43 is opened, the weighing bin 20 is discharged after being metered, and the materials can pass through the checking bin 40 and directly enter the user chute. In order to influence the discharging of the material referred to by the weighing bin 20 of the calibration bin 40, the projection of the first discharge opening 22 of the weighing bin 20 in the direction of gravity falls completely into the second feed opening 42 and the second discharge opening 43 of the calibration bin 40.
Since the checking bin 40 is used for checking the accuracy of weighing the material in the weighing bin 20, the checking bin 40 is preferably arranged by a pressure type weighing structure with higher weighing accuracy relative to the suspension type weighing of the weighing bin 20. In other embodiments, the weigh bin 20 may also be supported on the frame 10 by a plurality of shear beam sensors or a plurality of digital sensors. Illustratively, the frame 10 is provided with a mounting portion 11, the shear beam sensor or digital sensors are disposed on the mounting portion 11, and the weighing bin 20 is provided with a supporting portion on an outer surface thereof, the supporting portion being disposed on the shear beam sensor or digital sensors. The weighing bin 20 is supported on the mounting portion 11 of the frame body through the supporting portion thereof, and is supported on the frame body 10, so that a plurality of shear beam sensors or a plurality of digital sensors can accurately weigh the weight of the weighing bin 20 and materials therein.
The bulk material balance checking device of the utility model further comprises a buffer bin 60 and a control cabinet (not shown). The buffer bin 60 is disposed in the frame 10 and above the weighing bin 20. The buffer bin 60 is provided with a third discharge hole 61, and the third discharge hole 61 is arranged corresponding to the first feed hole 22 of the weighing bin 20, so that the materials in the buffer bin 60 can be discharged into the weighing bin 20. A third discharging door 62 which can open or close the third discharging hole 61 is arranged at the third discharging hole 61 of the buffer bin 60.
The control cabinet is connected with the first weighing sensor group 30, the second weighing sensor group 50, the first discharging door 23, the second discharging door 44 and the third discharging door 62, and can control the first weighing sensor group 30 and the second weighing sensor group 50 to weigh the weighing bin 20 and the checking bin 40 respectively according to a control program, and control the opening and closing of the first discharging door 23, the second discharging door 44 and the third discharging door 62.
According to the bulk material balance checking device, the real-time quick checking of the weighing bin 20 is realized by arranging the checking bin 40 below the weighing bin 20. During daily use of the weighing bin 20, the second discharging door 44 of the checking bin 40 is always in an open state; the weighing bin 20 is discharged after metering, and the material can directly pass through the checking bin 40 and enter the user chute. When the weighing bin 20 needs to be checked, the second discharging door 44 of the checking bin 40 is closed; and the weighing bin 20 is used for discharging after metering, the material enters the checking bin 40 for metering again, and the checking bin 40 is used for discharging after metering. The weight values of the weighing bins 20 and the calibration bins 30 are compared to accurately calibrate the weighing bins 20.
Compared with the prior art, the bulk material balance calibration device can adapt to the requirement of quick calibration of the bulk material balance, can immediately calibrate at any required time, and can ensure the continuity of equipment use.
According to the bulk material balance checking device, the checking bin is additionally arranged below the weighing bin, so that the bulk material balance checking device can check timely at any required time, and can also be used for temporarily replacing the weighing bin to work when the weighing bin fails, so that the continuity of equipment use (no shutdown) is ensured. No transition link is added between the weighing bin and the checking bin, so that the checking accuracy of the checking bin is improved.
According to the bulk material balance calibration device, the calibration bin adopts pressure type weighing, so that the measurement is more accurate, and the calibration result is more accurate.
According to the bulk material balance calibration device, the material object calibration is replaced by the calibration bin, so that the material object turnover and waste are reduced; through setting up the check-up feed bin and substituting the weight check-up, reduce the influence of personnel's operation to the check-up, reduce the intensity of labour of personnel's operation.
Referring to fig. 2, the utility model further provides a calibration method based on the bulk material balance calibration device, which comprises the following steps: s1, acquiring first material weight information m of materials transferred from the weighing bin to the checking bin. s2, acquiring second material weight information m' of the material acquired by the checking bin. And s3, comparing the difference value of the first material weight information m and the second material weight information m' and comparing the difference value with a preset value. If the difference value between the first material weight information m and the second material weight information m' is within the range of the preset value, no alarm occurs, otherwise, the alarm occurs. The alarm mode can comprise one or more of an audio alarm, a lamplight alarm and a display alarm; for example, when the difference between the first material weight information m and the second material weight information m' exceeds the range of the preset value, the control cabinet sends an alarm signal to a sound generating device such as a buzzer, and the control cabinet sends an alarm sound after receiving the alarm signal; the buzzer can be self-contained or independently arranged and electrically connected with the control cabinet; or the control cabinet can send an alarm signal to a light generating device such as an alarm lamp, and the control cabinet can send out light flashing to carry out alarm prompt when receiving the alarm signal; or the control cabinet can send an alarm signal to a display connected with the control cabinet, and the display receives the alarm signal and sends out a flashing mark or other marks to carry out alarm prompt.
Referring to fig. 3, the method for obtaining the first material weight information m of the material transferred from the weighing bin to the checking bin may include the following specific steps: s11, acquiring first weighing bin weight information m1 of the weighing bin 20 with the materials through the first weighing sensor group 30; s12, acquiring second weighing bin weight information m2 of the weighing bin 20 after transferring the materials through the first weighing sensor group 30; s13, calculating and obtaining a difference value between the weight information m1 of the first weighing bin and the weight information m2 of the second weighing bin so as to obtain first material weight information m of the material transferred from the weighing bin to the checking bin.
Referring to fig. 4, obtaining second material weight information m' of the material obtained by the verification bin includes: s21, acquiring the first checking bin weight information m3 of the checking bin 40 without materials through the second weighing sensor group 50; s22, acquiring second check bin weight information m4 of the check bin 40 after receiving the materials through the second weighing sensor group 50; s23, calculating and obtaining the difference value between the weight information m3 of the first checking bin and the weight information m4 of the second checking bin so as to obtain the weight information m' of the second material of the material obtained by the checking bin.
The control cabinet obtains the weight information m1 of the first weighing bin and the weight information m2 of the second weighing bin, calculates the difference value between the weight information m1 of the first weighing bin and the weight information m2 of the second weighing bin, obtains the weight information m3 of the first checking bin and the weight information m4 of the second checking bin, calculates the difference value between the weight information m3 of the first checking bin and the weight information m4 of the second checking bin, compares the difference value obtained by the two calculation, and compares the difference value between the two difference values with a preset value to obtain the checking condition.
The control cabinet and the first weighing sensor group and the second weighing sensor group can adopt a wireless or wired mode for signal transmission, and meanwhile, the control cabinet and a terminal (such as a computer, a mobile phone, a display or other equipment) can also adopt a wireless or wired mode for signal transmission, so that remote verification of the bulk material balance verification device is realized. The control cabinet can be accessed into a digital management system of an enterprise where a user is located at the same time to participate in the digital management of the enterprise.
The calibration method of the bulk material balance calibration device of the present utility model is explained in detail below through a specific operation procedure.
Step 1: the operator switches the working mode of the bulk material balance checking device to a balance checking mode;
step 2: opening the start button, closing the first discharging door 23 of the weighing bin 20, and closing the second discharging door 44 of the checking bin 40;
step 3: the third discharging door 62 of the buffer bin 60 is opened, the material enters the weighing bin 20, and when the target value is reached, the third discharging door 62 of the buffer bin 60 is closed;
step 4: the weighing bin 20 measures weight to obtain first weighing bin weight information m1; meanwhile, the check bin 40 (empty bin at this time) measures the weight to obtain first check bin weight information m3;
step 5: the first discharging door 23 of the weighing bin 20 is opened, and the materials in the weighing bin 20 enter the checking bin 40;
step 6: the first discharging door 23 of the weighing bin 20 after discharging is closed, the weight is measured again, the second weighing bin weight information m2 is obtained, the first material weight information m=m1-m 2 of the materials transferred from the weighing bin 20 to the checking bin 40 is obtained through calculation, and the first material weight information m=m1-m 2 is displayed on the terminal;
step 7: the weight of the checking bin 40 is measured, second checking bin weight information m4 is obtained, and second material weight information m' =m4-m 3 of the materials obtained by the checking bin 40 is obtained through calculation and is displayed on a terminal;
step 8: comparing the first material weight information m with the second material weight information m ', and if the first material weight information m and the second material weight information m' are within an allowable error range, displaying that the bulk material balance is accurate in metering; and if the error range exceeds the allowable error range, displaying that the bulk material balance is inaccurate in metering and giving out a fault alarm.
Compared with the prior art, the calibration method of the bulk cargo balance calibration device has the advantages that the weighing weight values are directly compared, the result is more accurate, and waiting is not needed.
According to the calibration method of the bulk material balance calibration device, the weight of the materials to be weighed is obtained by measuring the weighing bin with the materials and then measuring the weighing bin after the materials are weighed; meanwhile, the weight of the received material is obtained by measuring an empty checking bin and then measuring a checking bin for receiving the material, and the weight difference value of the two weight difference values is compared to check the weighing bin, so that the accuracy of measurement and check is ensured.
The calibration method of the bulk material balance calibration device can realize remote calibration, and the calibration result participates in enterprise digital management.
The foregoing descriptions of specific exemplary embodiments of the present utility model are presented for purposes of illustration and description. It is not intended to limit the utility model to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the utility model and its practical application to thereby enable one skilled in the art to make and utilize the utility model in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the utility model be defined by the claims and their equivalents.
Claims (13)
1. A bulk material scale verification device, comprising:
a frame body;
the weighing bin is arranged on the frame body, the weighing bin is connected with the frame body through a first weighing sensor group, the weighing bin is provided with a first discharge hole, and a first discharge door capable of opening or closing the first discharge hole is arranged at the first discharge hole;
the check bin is arranged on the frame body and corresponds to the first discharge port of the weighing bin, so as to receive materials from the weighing bin, the check bin is connected with the frame body through a second weighing sensor group, the check bin is provided with a second discharge port, and a second discharge door capable of opening or closing the second discharge port is arranged at the second discharge port.
2. The bulk material scale verification device of claim 1, wherein the verification bin is supported on the frame by the second set of weighing sensors.
3. The bulk material balance verification device of claim 2, wherein the second set of weighing sensors comprises a plurality of shear beam sensors or a plurality of digital sensors.
4. The bulk material scale verification device of claim 1, wherein the weigh bin is suspended from the frame by the first set of weigh sensors.
5. The bulk material balance calibration device of claim 4, wherein the first set of weighing sensors comprises a plurality of s-type pull sensors.
6. The bulk material scale verification device of claim 1, wherein the weigh bin is supported on the frame by the first set of weigh sensors.
7. The bulk material balance verification device of claim 6, wherein the first set of weighing sensors comprises a plurality of shear beam sensors or a plurality of digital sensors.
8. The bulk material balance checking device according to claim 1, wherein the checking bin is disposed below the weighing bin, and a feed inlet of the checking bin is disposed corresponding to the first discharge outlet.
9. The bulk material balance calibration device of claim 8, wherein a projection of the first discharge port of the weigh bin in the direction of gravity falls into the second discharge port of the calibration bin.
10. The bulk material balance calibration device according to claim 8, further comprising a buffer bin arranged on the frame body, wherein the buffer bin is provided with a third discharge port, and a third discharge door capable of opening or closing the third discharge port is arranged at the third discharge port;
the weighing bin is arranged corresponding to the third discharge hole of the buffering bin so as to receive materials from the buffering bin.
11. The bulk material balance checking device according to claim 10, wherein the weighing bin is disposed below the buffer bin, and a feed inlet of the weighing bin is disposed corresponding to the third discharge outlet.
12. The bulk material balance verification device of claim 10, further comprising a control cabinet, wherein the control cabinet is connected to the first weighing sensor group, the second weighing sensor group, the first discharge door, the second discharge door, and the third discharge door.
13. The bulk material balance calibration device of claim 1, wherein the frame is configured as a tank structure, and the weighing bin and the calibration bin are both located within the tank structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320499892.9U CN219416423U (en) | 2023-03-15 | 2023-03-15 | Bulk material balance calibration device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320499892.9U CN219416423U (en) | 2023-03-15 | 2023-03-15 | Bulk material balance calibration device |
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| CN219416423U true CN219416423U (en) | 2023-07-25 |
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| CN202320499892.9U Active CN219416423U (en) | 2023-03-15 | 2023-03-15 | Bulk material balance calibration device |
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