JP7025987B2 - Anomaly detection device and abnormality detection method for weighing equipment - Google Patents

Description

The present invention relates to an abnormality detection device and an abnormality detection method for a weighing device.

As a weighing device, a device equipped with a digital load cell that supports a load-bearing unit such as a platform and an indicator that processes a signal from the digital load cell to calculate and display the weight is already widely known. Also, in this type of weighing device, a truck scale used for measuring the load capacity of cargo carried by a vehicle such as a truck is already widely known.

On the truck scale, weigh in advance in the empty state (empty state) with no cargo loaded, and then weigh in the empty state (loaded state) with cargo loaded, and weigh the empty state from the measured value in the loaded state. The cargo weight is calculated by subtracting the value, and the described weighing slip is issued or the cargo weight is confirmed.

In addition, measuring devices including truck scales used for conducting various transactions and certifications are called specific measuring instruments, and this type of specific measuring instrument needs to be inspected at predetermined intervals. For a specific measuring instrument, it is a condition that the inspection is passed if it has sufficient accuracy even at the time of inspection.

Here, in the weighing device including the track scale, when the power of the indicator is turned on, the so-called power-on-zero operation (zero (0) point adjustment at the time of turning on the power) is set to set the weight in this power-on state to 0 (zero). The operation (zero point setting operation)) is performed automatically. In this case, a zero point is automatically set if it is within a predetermined allowable range.

Further, in truck scales, so-called weighing sites (installation sites) are often outdoors so that vehicles can easily enter the platform and digital load cells. Further, the permissible fluctuation range is set to be relatively large (for example, within 10% of the weighing) so that the zero point setting operation can be performed without any problem even if there is a certain fluctuation when the power is turned on.

On the other hand, since the truck scale indicator is generally installed indoors, the indicator installed indoors and the platform installed outdoors are relatively far apart (in some cases, several hundred meters). In this case, the person operating the indicator may not be aware of the status of the platform.

Further, in such a weighing device such as a truck scale, various error displays may be displayed at the time of weighing. For example, when the measured weighing value exceeds the weighing value, a weighing over error is displayed, and when the measured value by the digital load cell becomes abnormal at the time of measurement, a load cell abnormality error is displayed, and the measured weight is preset. When the value becomes smaller than the negative value (for example, when the measured value is less than the minus 20 scale), a minus over error is displayed.

JP-A-2015-200584

However, even if the user contacts the manufacturer of the weighing device because an error display appears at the time of weighing, for example, the error display is not reproduced when the manufacturer confirms it, which is the cause of the error display. I don't understand. That is, since it is not possible to know the situation or circumstances of the error display under what circumstances, the cause of the error display may not be known.

In addition, there may be a contact or inquiry from a user or the like that the measured value of the issued weighing slip is incorrect. However, even if the manufacturer tries to confirm it later, the cause may not be known because the situation at that time is unknown.

Also, when the power of the indicator is turned on, the zero point setting operation is automatically performed if it is within the allowable fluctuation range, so if something is not on the platform when the power is turned on, the situation is not correct. , The cargo weight value may be incorrect. For example, in the case of a truck scale with a weighing of 40 tons and an allowable fluctuation range of 10% or less of the weighing, even if something is on the platform when the power is turned on, if it is within 4 tons, the zero point is set as it is. Therefore, if the situation on the platform after that changes, a measurement error will occur by that amount.

For example, if snow or rain accumulates on the platform when the power is turned on and the situation changes during weighing, the weighing value will be inaccurate. In some cases, even though the vehicle is on the indicator when the power is turned on, the operator of the indicator does not notice this and continues the weighing operation as it is, and then the situation changes. (For example, the vehicle on the platform moves), the weighing value may become inaccurate, or a negative over error may be displayed. Even in such a case, even if the manufacturer or the like tries to confirm it later, the cause may not be known because the situation at that time is unknown.

In addition, stones may be caught between the platform and the foundation around the platform, or between the platform and the digital load cell, such as when gravel falls. Weighing under such circumstances may result in inaccurate weighing values, but if the pinched area is difficult to see, it may take some time to identify the cause or it may not be known. There is.

For such a defect, for example, Patent Document 1 discloses a vehicle weight weighing system and a vehicle weight weighing method in which a state in which a vehicle is placed on a platform is imaged and recorded by an image pickup device. In this weighing system and vehicle weight weighing method, a vehicle stopped on a platform is imaged, and the vehicle number (license plate number) and the weighing data are associated and saved from the image data, so that the vehicle number is erroneously stored. Even if you have entered it, you can check it later. It is also disclosed that the weighing operation can be performed while checking the status of the platform from the operator in the office where the indicator is installed.

By using this weighing system and vehicle weight weighing method, the situation at the time of weighing can be visually confirmed by checking the captured image, so for example, from a user who displays an error or the weighing value is incorrect. Even if there is a contact, if there is an image that can be inferred to be the cause, it is possible to identify the cause from the recorded image. For example, if there is snow or rain on the platform, it can be inferred that these are the causes.

However, since the image captured by the imaging means has a blind spot, the cause cannot be identified if the cause location is not captured by the blind spot. Also, if a stone is caught between the platform and the foundation around the platform, or between the platform and the digital load cell, it is difficult to recognize this from the remaining image. be.

The present invention solves the above-mentioned problems, and it is possible to identify or infer the cause of an abnormal state when an abnormal state occurs or during a periodic inspection in a weighing device including a truck scale. It is an object of the present invention to provide an abnormality detection device and an abnormality detection method of the weighing device.

In order to solve the above problems, the abnormality detection device of the weighing device of the present invention processes a load load unit such as a platform, a digital load cell that supports the load load unit and outputs data, and a signal from the digital load cell. It is characterized by having an indicator for calculating the weight and a recording / storage unit for recording and storing the output information of the digital load cell before and after a predetermined event in the weighing device. Further, it is preferable that the recording / storage unit saves the saved output information of the digital load cell as maintenance information.

Further, in the abnormality detection method of the weighing device of the present invention, a load load unit such as a platform, a digital load cell that supports the load load unit and outputs data, and a signal from the digital load cell are processed to measure the weight. It is an abnormality detection method of a measuring device that detects an abnormality in a measuring device equipped with an indicator for calculation, and records output information of a digital load cell that is continuous in time from before to after a predetermined event. It is characterized by saving.

According to the abnormality detection device and the abnormality detection method of the weighing device, the output information of the digital load cell before and after the predetermined event is saved. Therefore, when an abnormality occurs, the output information of the saved digital load cell is used. The cause of the abnormal condition can be detected and inferred. In particular, since the output information of the digital load cell before the predetermined event as well as after the predetermined event is saved, it is possible to confirm whether or not the abnormality occurred before the predetermined event. In addition, it is possible to detect the fluctuation state of the value of the output information with the passage of time including the state before the event (that is, the output value of the digital load cell is known linearly with the passage of time instead of a point. Therefore, it becomes easier to recognize the fluctuation tendency, and it becomes easier to confirm whether or not it was abnormal.

Further, the present invention is characterized in that the output information of the digital load cell from before a predetermined time to after a predetermined time of a predetermined event is stored. With this configuration, it is possible to relatively reduce the amount of information of the output information of the digital load cell to be stored.

Further, the present invention is characterized in that a plurality of digital load cells are provided and the output information of all the digital load cells is stored in the recording / storage unit. With this configuration, it is possible to detect and infer the cause of the abnormal state of each digital load cell, and there is no loss of information that becomes a blind spot as in the case of imaging.

Further, the present invention is characterized in that a plurality of output information of digital load cells of the same event stored in the recording / storage unit can be compared and displayed or output. With this configuration, and when the weighing device has been used for a long period of time, it is possible to detect, display, and output signs related to aging of the digital load cell from the output information of the digital load cell of the weighing device. Therefore, it is possible to confirm the display information and the output information and more easily recognize the long-term tendency such as the output status of the digital load cell.

Further, it is preferable that at least a part of the events is the execution of the zero point setting operation performed when the power of the indicator is turned on. Further, it is also preferable that at least a part of the events, including the time of weighing, is from the time when the load target is placed on the load-bearing portion to the time when the load target is removed. It is also suitable if at least some of the events are weighing errors. It is also suitable when the weighing device is a truck scale.

According to the present invention, by recording and storing the output information of the digital load cell that is continuous in time from before to after a predetermined event, when an abnormality occurs, the output information of the stored digital load cell is used. The cause of the abnormal condition can be detected and inferred. In particular, since the output information of the digital load cell before the predetermined event as well as after the predetermined event is saved, it is possible to confirm whether or not the abnormality occurred before the predetermined event.

Further, by saving the output information of the digital load cell from before the predetermined time to after the predetermined time of the predetermined event, for example, by saving the output information of the digital load cell from a few seconds before to a few seconds after the predetermined event. It is possible to relatively reduce the amount of information of the output information of the digital load cell to be saved, and it is also possible to save all the information from the start to the end of use of the weighing device with a general recording / storage device.

In addition, a plurality of digital load cells are provided, and by storing the output information of all the digital load cells in the recording / storage unit, the cause of the abnormal state related to each digital load cell can be detected and estimated, and an image is taken. There is no lack of information that becomes a blind spot as in the case.

In addition, by configuring the output information of multiple output information of the digital load cell of the same event stored in the record storage unit to be compared and displayed or output, or when the weighing device has been used for a long period of time, the weighing device can be used. Since it is possible to detect and display or output signs related to aging of the digital load cell from the output information of the digital load cell, check this display information and output information to check the output status of the digital load cell, etc. Long-term trends can be recognized more easily. In addition, it is possible to prevent the occurrence of an abnormality by changing the digital load cell or performing various maintenances before the abnormality occurs.

Further, if the event is the execution of the zero point setting operation performed when the power of the indicator is turned on, the adjustment amount due to the zero point setting operation can be recognized. Also, if the weighing device is a truck scale, it can be easily inferred that snow, rain, vehicles, etc. were on the platform when the power was turned on, and it is possible that the zero point was set in a bad state. It can be inferred that there is sex.

Further, if the event is from the time when the load target is placed on the load-bearing portion to the time when the load target is removed, including the time of weighing, it is possible to estimate whether or not the weight is measured in the correct state. Also, if the weighing device is a truck scale, for example, if the weighing value is maximized before or after weighing, part of the vehicle was not yet on the platform during weighing (tires). It can be inferred that a part of the cargo was not mounted on the platform 2), and as a result, the weight of the weighed cargo may be smaller (when weighed in the loaded state) or larger (when weighed in the empty state). I can guess that it is.

Further, when the event is a weighing error, it can be determined including the output information of the digital load cell before the weighing error occurs, so that the cause of the weighing error can be easily guessed.

It is a figure which shows simply showing the weighing apparatus (the abnormality detection apparatus of the weighing apparatus) which concerns on embodiment of this invention. It is a figure which shows simply showing the indicator accommodating part, the indicator, etc. of the measuring device. It is a figure which shows the change state of the measured value from before weighing to after weighing at the time of normal weighing. It is a figure which shows the change state of the measured value from before the measurement to after the measurement at the time of an abnormal measurement. It is a figure which showed the left-right balance state and the front-back balance state at the time shown in FIG. 3, respectively. It is a figure which showed the left-right balance state and the front-back balance state at the time shown in FIG. 4, respectively.

Hereinafter, the abnormality detection device and the abnormality detection method of the weighing device according to the embodiment of the present invention will be described with reference to the drawings.
Here, FIG. 1 is a diagram simply showing a truck scale which is an example of a weighing device (abnormality detecting device of the measuring device) according to the embodiment of the present invention, and FIG. 2 is an indicator storage unit of the measuring device. It is a figure which shows the indicator etc. simply.

As shown in FIGS. 1 and 2, the truck scale as an example of the weighing device 1 has a load-bearing part 2 as a load-bearing part on which a load is loaded (a loaded truck is placed on the load cell) and the load cell. A plurality of digital load cells 3 that support 2 and output data corresponding to the load, an indicator 4 that calculates a load (weight) based on an output signal from the digital load cell 3, a digital load cell 3 and an indicator 4. It is provided with a connection wiring 5 for connecting the above, a power supply unit 6 connected to a commercial power supply, and the like. Although not shown, the mounting table 2 is arranged so as to be surrounded by a foundation (or an outer peripheral frame) or the like, but not in contact with the foundation or the like. Further, a stopper is attached to the foundation or the platform 2 so as not to move significantly from front to back and left and right, and a gap is opened between the stopper and the platform 2 or between the stopper and the foundation. It will be installed in the situation. Further, in this embodiment, as shown in FIGS. 1 and 2, the indicator 4 and the power supply unit 6 are housed in the indicator storage unit (indicator storage box (storage housing) 10). The case is shown, but it is not limited to this.

Further, in this embodiment, as shown in FIG. 1, a case where a plurality (4) digital load cells 3 are provided (digital load cells 3A to 3D) is shown, but the digital load cells 3 (3A to 3D) are shown. ) May be one, or may be plural other than four. In this embodiment, all the digital load cells 3 (3A to 3D) are connected to the load cell unit connection portion (so-called junction box) 7, and power is supplied to the digital load cell 3 side through the connection wiring 5. Signals from each digital load cell 3 (3A to 3D) are sent to the indicator 4 side through the connection wiring 5. In FIG. 2, 11 is an overall power switch that turns on (connects) and turns off (disconnects) the power of the entire measuring device 1 including the indicator storage unit 10, 12 is a power plug connected to a commercial power source, and 13 is. It is a terminal block to which the connection wiring 5 is connected.

As shown in FIG. 2, the indicator 4 is assembled to, for example, the indicator storage unit (indicator storage box) 10 in a detachable state, and includes the indicator power switch 4a and various types including the measured value. A display unit 4b for displaying information, an input unit 4c used for making various settings, and a digital load cell 3 are instructed to send a signal such as a weight value, and signals from all the digital load cells 3 are input. It has an indicator CPU (indicator control unit) 4d for calculating a measurement value and performing various controls related to the measurement operation, a storage unit 4e for storing various information related to the measurement, and the like.

Further, in the indicator storage unit 10 that detachably stores the indicator 4, a sub-board 15 having a power supply unit 6, a sub CPU 16, and the like, a built-in CPU (upper CPU) 17 that controls the entire measuring device 10, and the like. A storage unit 18 for storing and storing various types of information is also provided. The sub-board 15 is also provided with a storage unit 16a having an area for temporarily storing output data and the like from the digital load cell 3.

In this measuring device 1, even when the power switch 4a of the indicator 4 is not turned on, power is supplied to the sub-board 15 and the digital load cell 3, and the output data from the digital load cell 3 is temporarily stored in the storage unit of the sub CPU 16. It is temporarily stored in 16a. Further, when the power switch of the indicator 4 (indicator power switch 4a) is turned on, the indicator, the built-in CPU 17, and the storage unit 18 are energized. Further, when the indicator power switch 4a is turned on, the so-called power-on-zero operation (zero (0) point adjustment operation (zero point setting operation) when the power is turned on) that sets the weight in the power-on state to 0 (zero) is performed. It is done automatically. In this case, a zero point is automatically set if it is within a predetermined allowable range.

Here, the storage unit 18 is provided with a recording / storage unit 18a that records and stores the output information of the digital load cell 3 that is continuous in time from before to after a predetermined event (the recording / storage area is provided). be).

In the recording storage unit 18a, the output information of the digital load cell 2 from before the predetermined time to after the predetermined time of the predetermined event is stored as maintenance information. Specifically, the output data from the digital load cell 3 is stored in the storage unit 16a of the sub CPU 16 at any time by a FIFO (first in / first out: first in / first out) method. Then, if there is an event to be described later, the built-in CPU (upper CPU) 17 outputs the digital load cell 3 to the sub CPU 16 from a predetermined time before (for example, a few seconds) to a predetermined time (for example, a few seconds) after the event. The information is instructed to be sent, the output information corresponding to the information is received, and the output information is stored in the recording / storage unit 18a.

Further, output data corresponding to the load is output from the digital load cell 3 at predetermined cycles of, for example, several times per second or several tens of times (for example, 10 times per second). Therefore, a plurality of output information of the digital load cell 3 before and after the event are continuously stored in the recording storage unit 18a, and these are continuously recorded (not as dots but as lines). From the output information, it is possible to observe the fluctuation tendency and stability of the values before and after the event. Further, it is configured so that a plurality of output information of the digital load cell 3 of the same event stored in the record storage unit 18a can be compared and displayed on the display unit 4b, or can be output to the outside by connecting to a printer or the like. There is. Further, when the event is saved in the recording / saving unit 18a, the event occurrence time is also recorded / saved (for example, the time of the clock unit provided in the sub CPU 16 is recorded).

The recording / storage unit 18a records and stores the output information of the digital load cell 3 that is continuous in time from before to after the three events (first to third events). The first event is the execution of the zero point setting operation performed when the power of the indicator 4 is turned on. The second event is from the time when the load target is placed on the load-bearing portion to the time when the load target is removed, including the time of weighing. The third event is a weighing error.

When the power of the indicator 4 as the first event is turned on, the zero point setting operation is automatically performed, but from a predetermined time before (for example, a few seconds) to a predetermined time (for example, a few seconds) when the indicator 4 is turned on. All the output information of each digital load cell 3 up to this point is saved every time the power of the indicator 4 is turned on.

Further, when the vehicle is placed on the platform 2 and then weighed and the vehicle gets off the platform 2 (second event), a predetermined time before the vehicle starts to be mounted on the platform 2 (for example, after a few seconds). Therefore, all the output information of each digital load cell 3 until a predetermined time (for example, several seconds later) when the vehicle gets off the platform 2 (at the time of leaving) is stored every time the vehicle is mounted on the platform 2.

Further, when a weighing error occurs (third event), the output information of each digital load cell 3 from a predetermined time before (for example, after a few seconds) to a predetermined time (for example, after a few seconds) when the weighing error occurs is displayed. Every time a weighing error occurs, everything is saved. For example, when the measured weighing value exceeds the weighing value, a weighing over error is displayed, and when the measured value by the digital load cell 3 becomes abnormal at the time of measurement, a load cell abnormality error is displayed and the measured weight is negative. When it becomes, a minus over error is displayed, but when these measurement errors occur, each digital from a predetermined time before (for example, a few seconds) to a predetermined time (for example, a few seconds) when the measurement error occurs. All the output information of the load cell 3 is saved every time a measurement error occurs.

When the output information of the digital load cell 3 is recorded and saved in the recording / saving unit 18a, it is preferable to record and save the output information together with the identification information that can identify which event it is. , Not limited to this.

In the above configuration, the zero point setting operation is automatically performed when the power of the indicator 4 is turned on. For example, when the weighing device 1 is a track scale having a weighing of 40 tons and an allowable fluctuation range of 10% or less of the weighing, even if something is placed on the platform 2 at the time of turning on the power, it is within 4 tons. If there is, the zero point is set as it is, and if the situation on the platform 2 after that changes, a measurement error will occur by that amount.

For example, if snow is piled up on the platform 2 or rain is accumulated when the power is turned on, the weight of the snow or rain is loaded on the platform 2, so that the output information of the digital load cell 3 is used. Based on (comparing with the output information of the digital load cell 3 on other days, etc.), it can be inferred that something was on the platform 2. Therefore, from the date and time, the weight, etc., it can be inferred that the zero point setting may have been performed in a bad state due to snow or rain accumulated on the platform 2.

In addition, when weighing empty vehicles or weighing vehicles in a loaded state under the condition that snow is piled up or rain is accumulated on the platform 2 in this way, when these vehicles enter and exit or when weighed. It is also possible to presume that the weighing information may have become inaccurate due to the vibration of the platform 2 and the removal of snow and rain.

Further, even when a vehicle or other articles are mounted on the platform 2 when the power is turned on, the load of the vehicle or these articles is loaded on the platform 2, so that the load is based on the output information of the digital load cell 3. (Comparing with the output information of the digital load cell 3 on other days, etc.), it can be inferred that the vehicle or some other article was placed on the platform 2.

Further, if the vehicle is mounted on the platform 2 when the power is turned on, the vehicle is subsequently detached from the platform 2 and the load is greatly reduced, so that a negative over error is displayed in which the measured weight is negative. Even in such a case, it is possible to infer or suspect that the vehicle is mounted on the platform 2 when the power is turned on.

In addition, stones may be caught between the platform 2 and the foundation around the platform 2 or between the platform 2 and the digital load cell 3 due to the gravel placed on the vehicle falling. be. When weighing under such a situation, the load may be diffused through the bitten portion and the measured value may become inaccurate. In this case, when an image of a vehicle or the like on a platform is captured by an imaging means as disclosed in Patent Document 1, if the sandwiched place is difficult to see, it takes time to identify the cause. It may take or you may not understand. On the other hand, according to the above configuration, the measured value of the digital load cell 3 near the place where the stone or the like is bitten becomes small, so by observing this value or comparing it with the data of other dates and times, , Guess that a stone has been bitten or the timing of biting, or that it is still bitten (in this case, this tendency continues not only when weighing but also when the power is turned on). It is possible to do it.

Further, when the weighing device 1 is used for a long period of time, the output of the digital load cell 3 is stable by observing the history of the output information of the digital load cell 3 each time the power is turned on, and a certain digital load cell 3 is used. The output of is may become downward, upward, or unstable later. In this case, when the weighing device has been used for a long period of time or during periodic inspections, signs related to aging of the digital load cell 3 may be detected and displayed from the output information of the digital load cell 3 of the weighing device 1. Since it can be output, it is possible to confirm the display information and the output information and more easily recognize the long-term tendency such as the output status of the digital load cell 3. Further, when the value of the specific digital load cell 3 fluctuates, it is possible to estimate the time when the digital load cell 3 starts to become abnormal. In addition, by checking the output information of the digital load cell 3, it is relatively easy to infer from each behavior that it is desirable to perform maintenance such as checking the assembly status with the digital load cell 3 and the mount 2. Can be done and reliability is improved. Further, by confirming the transition of such history information, it is possible to prevent the occurrence of an abnormality.

In addition, for example, when there is an inquiry that the cargo weight is incorrect, the vehicle gets off the platform 2 from a predetermined time before (for example, a few seconds) when the vehicle starts to be mounted on the platform 2 at this time. By observing the output information of each digital load cell 3 (second event) until a predetermined time (for example, a few seconds later) at the time (at the time of withdrawal), the following situation can be inferred.

For example, when the weighing value is maximized before or after weighing, a part of the vehicle is not completely mounted on the platform 2 at the time of weighing (a part of the tire is mounted on the platform 2). It can be inferred that the weight of the weighed cargo was smaller (when weighed in the loaded state) or larger (when weighed in the empty state). Note that FIGS. 3 and 4 show changes in the measured values from immediately before the measurement to after the measurement. When weighing, first, the front wheels of a vehicle such as a truck are placed on the platform 2 to increase the measured load, and then the rear wheels (in the present embodiment, the rear wheels have two axes) are mounted on the platform 2. The measured load increases, and the weight is measured with all the wheels mounted. Therefore, normally (at the time of normal weighing), as shown in FIG. 3, the maximum measured load is almost the same at the time of weighing. On the other hand, as shown in FIG. 4, since the measured load continues to increase after the weighing and reaches the maximum measured load after the weighing, a part of the vehicle (for example, a part of the tire of the rear wheel) at the time of weighing. It can be inferred that was not completely placed on the platform 2. That is, it can be inferred that the cargo weight was not accurate due to this, and in some cases, advice can be given to the user.

Further, FIG. 5 is a diagram showing the left-right balance state A and the front-rear balance state B when shown in FIG. 3, and FIG. 6 shows the left-right balance state A when shown in FIG. It is a figure which showed the balance state B before and after, respectively. In FIGS. 5 and 6, the left-right balance state A indicates the time when the center of gravity of the vehicle is in the center at 50%, and the closer to the left and right ends, the closer to 0% or 100%. Further, the front-rear balance state B indicates the time when the center of gravity of the vehicle is in the center of the front-rear at 50%, and the closer the vehicle starts to ride, the closer to 0%, and the closer the vehicle gets off, the more 100. Approaching%.

In this weighing device 1, the left and right balance state A and the front and rear balance state B can be displayed or output to the outside from the weight value of the output information of each digital load cell 3. Normally (during normal weighing), as shown in FIG. 5, when all the wheels of the vehicle are placed on the platform 2, both the left and right balance state A and the front and rear balance state B are stable, but FIG. 6 As shown in, it can be seen that the weighing was performed in a state where the front-rear balance state B is increasing (not yet stable), and even based on the diagram showing such a balance state A, the vehicle is measured at the time of weighing. It can be inferred that a part (for example, a part of the rear wheel tire) was not completely mounted on the platform 2. In addition, by checking the left and right balance state A, if the left and right balance state A is poorly weighed, it can be inferred that either the left or right wheel is weighed in a state where it protrudes from the mount 2. Can be done.

Further, when a vehicle is placed on the platform 2, if a strong wind (crosswind or the like) is blowing, the vehicle is blown by the wind, so that the weighing load is often unstable. Therefore, even in such a case, the output information of each digital load cell 3 is confirmed from the predetermined time before the vehicle starts to be mounted on the platform 2 to the predetermined time after the vehicle gets off the platform 2. Therefore, it is possible to infer such a situation (the situation was unstable at the time of weighing and at the timing before and after the measurement due to wind or the like). Similarly, if a person such as a driver gets on or off during these periods, the measured value will fluctuate by the weight of that person, so it is possible to infer these situations. Will be.

Further, as described above, when a weighing error occurs (third event), each digital load cell 3 from a predetermined time before (for example, after a few seconds) to a predetermined time (for example, after a few seconds) when the weighing error occurs. All the output information of is saved every time a weighing error occurs. For example, when the measured weight value exceeds the weighing value, a weighing over error is displayed, and when the measured value by the digital load cell 3 becomes abnormal at the time of measurement, a load cell abnormality error is displayed, and the measured weight is measured in advance. When the value becomes smaller than the set negative value (for example, when the measured value is less than -20 stitches), a negative over error is displayed. In any case, when these weighing errors occur, the output information of each digital load cell 3 from a predetermined time before (for example, after a few seconds) to a predetermined time (for example, after a few seconds) when the weighing error occurs is the weighing error. Every time an error occurs, it is saved, so it is easy to guess the cause of the error.

For example, if an external impact is received or an earthquake occurs before the weighing over error occurs, the change status of the measured value due to the decrease at that time can be known and the cause can be easily guessed. Further, when the measured value by the digital load cell 3 becomes abnormal at the time of measurement, a load cell abnormality error is displayed, but since the measurement data of the digital load cell 3 immediately before the abnormality is also known, the abnormality occurs immediately before the abnormality occurs. It is possible to distinguish whether it was applied or whether it was normal immediately before the abnormality occurred, and it becomes easier to guess the cause of the abnormality. Further, when the measured weight becomes smaller than the preset negative value (for example, when the measured value is less than the minus 20 scale), a minus over error is displayed. In this case, the minus over error is displayed. Even immediately before the error occurs, it becomes easier to guess the cause depending on whether the measured value of the platform 2 is approaching 0. Further, as described above, when a vehicle or other object is mounted on the platform 2 when the power is turned on, the vehicle is subsequently detached from the platform 2 and the load is greatly reduced, so that the measured weight is measured in advance. A negative over error is displayed when the value becomes smaller than the set negative value, and based on this information, it is possible to guess or suspect that the vehicle is mounted on the platform 2 when the power is turned on. .. Further, when the error display is displayed, only the error display is displayed on the display unit 4b, and it has not been possible to confirm to what extent the error is specifically exceeded. On the other hand, since the measurement data (output information) of the digital load cell 3 when the error is displayed in this way can be recorded and confirmed, the situation at the time of the error is confirmed while checking how much the error is exceeded. It is possible to make a judgment based on this situation.

As described above, according to the abnormality detection device and the abnormality detection method of the measuring device 1 according to the embodiment of the present invention, the output information of the digital load cell 3 that is continuous in time from before to after a predetermined event is recorded. When an abnormality occurs, the cause of the abnormal state can be detected or inferred from the output information of the stored digital load cell 3. In particular, since the output information of the digital load cell 3 not only after the predetermined event but also before is saved, it is possible to confirm whether or not the abnormality occurred before the predetermined event.

Further, a plurality of digital load cells 3 (3A to 3D) are provided, and the output information of all the digital load cells 3 (3A to 3D) is stored in the recording / storage unit 18a, thereby relating to each digital load cell 3 (3A to 3D). The cause of the abnormal state can be detected and inferred, and the lack of information that becomes a blind spot as in the case of imaging does not occur.

In the above embodiment, the case where the recording / storage unit 18a is provided in the storage unit 18 stored in the indicator storage unit 10 is described, but the present invention is not limited to this, and the recording / storage unit is instructed. It may be provided in any place such as the inside of the meter or the outside of the indicator storage unit 10.

Further, in the above embodiment, the case where the measuring device 1 is a track scale has been described, but the present invention is not limited to this, and the measuring device 1 can be applied to various measuring devices such as a hopper scale and a coil scale. Further, in the above embodiment, the case where the load-bearing part to which the load is applied is the platform 2, but the present invention is not limited to this, and the measuring device can be used as a load-bearing part on which the object to be measured is suspended. It can also be applied to a hanging scale (suspended scale) having a hanging portion.

1 Weighing device (truck scale)
2 Platform 3, 3A to 3D Digital load cell 4 Indicator 4a Indicator power switch 4b Display unit 4c Input unit 4d Indicator CPU (Indicator control unit)
4e Storage unit 10 Indicator storage unit 15 Sub board 16 Sub CPU
16a Storage unit 17 Built-in CPU (upper CPU)
18 Storage unit 18a Record storage unit

Claims (9)

Abnormality in a weighing device equipped with a load-bearing part such as a mount, a digital load cell that supports this load-bearing part and outputs data, and an indicator that processes signals from the digital load cell to calculate the weight. It is an abnormality detection device of the weighing device that detects
It has a recording / storage unit that records and stores the output information of digital load cells that are continuous in time from before to after a predetermined event.
The predetermined event is the execution of the zero point setting operation performed when the power of the indicator is turned on.
Anomaly detection device for weighing devices characterized by. The abnormality detection device for a weighing device according to claim 1, wherein the record storage unit stores the stored output information of the digital load cell as maintenance information. The abnormality detection device for a weighing device according to claim 1 or 2, wherein the recording / storage unit stores the output information of the digital load cell from before a predetermined time to after a predetermined time of a predetermined event. The abnormality detection device for a weighing device according to any one of claims 1 to 3, wherein a plurality of digital load cells are provided and output information of all the digital load cells is stored in a recording / storage unit. The weighing device according to any one of claims 1 to 4, wherein a plurality of output information of digital load cells of the same event stored in a record storage unit can be compared and displayed or output. Anomaly detector. The abnormality of the weighing device according to any one of claims 1 to 5 , wherein the predetermined event is from the time when the load target is placed on the load-bearing portion to the time when the load target is removed, including the time of weighing. Detection device. The abnormality detection device for a weighing device according to any one of claims 1 to 6 , wherein the predetermined event is a weighing error . The abnormality detection device for a weighing device according to any one of claims 1 to 7 , wherein the weighing device is a truck scale . In a weighing device equipped with a load-bearing part such as a platform, a digital load cell that supports the load-bearing part and outputs data, and an indicator that processes a signal from the digital load cell to calculate the weight. It is an abnormality detection method for measuring devices that detect abnormalities.
To record and save the output information of the digital load cell that is continuous in time from before to after the execution of the zero point setting operation performed when the power of the indicator is turned on.
An abnormality detection method for weighing devices.

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