JP7453675B2 - Weighing device - Google Patents

Description

The present disclosure relates to a metering device.

Conventionally, there has been a transport section that can transport articles, a weighing section that outputs an original signal corresponding to the weighing component of the force applied to the transport section, and a weighing section that applies a digital filter to the original signal to generate a weighing signal. A weighing device is known that includes a processing section that performs weighing processing based on the above (for example, Patent Document 1).

Special table 2015-141670 publication

In the above-mentioned measuring device, when it is installed at the installation location, the zero point is acquired, for example, before the start of an inspection. After the zero point is obtained and the measuring device is installed at the installation location, the conditions of the measuring device and its surroundings (e.g. abnormalities in the measuring section, vibrations of the measuring device itself, vibrations transmitted to the measuring device from the outside, etc.) change over time. As a result, an abnormality in the measuring section may occur, such as a deviation of more than a certain level or worsening of dispersion with respect to the initially obtained zero point. Such an abnormality in the measuring section may affect the yield rate of the production of articles, for example, when the measuring device is applied to an article production line. In this way, it is desired to suppress the measurement accuracy of the measurement device from decreasing over time.

An object of the present disclosure is to provide a weighing device that is capable of suppressing a decrease in productivity due to a decrease in weighing accuracy over time.

The weighing device according to the present disclosure includes a transport section capable of transporting an article, a weighing section that outputs an original signal corresponding to a measurement component of a force applied to the transport section, and a weighing signal by applying a digital filter to the original signal. and a processing unit that performs weighing processing based on the weighing signal, and the processing unit evaluates weighing accuracy based on the weighing signal when no article is located on the carrying unit during operation of the carrying unit. First accuracy information is generated for the measurement, and an abnormality in the measuring section is detected based on the generated first accuracy information.

According to this weighing device, when no article is located on the transport section during operation of the transport section, the first accuracy information for evaluating the weighing accuracy is generated based on the weighing signal. An abnormality in the measuring section is detected based on the generated first accuracy information. In this way, the first accuracy information when no article is located on the conveyor during operation of the conveyor is used as a reference to detect changes over time in the weighing device and its surroundings (for example, vibrations in the floor). By regarding the increase (increase) as a change in accuracy information relative to the standard, it is possible to detect abnormalities in the measuring section earlier than when detection is not performed based on the standard. As a result, it becomes possible to quickly resolve the abnormality in the measuring section and restart the weighing process, thereby making it possible to suppress a decrease in productivity due to a decline in weighing accuracy over time.

After generating the first accuracy information, the processing unit further generates second accuracy information for evaluating changes in measurement accuracy over time, and detects an abnormality based on the comparison result between the first accuracy information and the second accuracy information. May be detected. In this case, by evaluating the second accuracy information based on the first accuracy information, even non-experts can easily evaluate changes over time in the measurement accuracy.

The processing unit stores a plurality of digital filters in advance, and when an abnormality is detected, applies a digital filter different from the digital filter applied to generate the first accuracy information, and adjusts the measurement accuracy using the different digital filter. Generate third accuracy information for evaluating, and select either the different digital filter or a predetermined default digital filter based on the comparison result between the first accuracy information and the third accuracy information, and perform weighing processing. You may do so. In this case, by automatically switching the digital filter based on the comparison result between the first accuracy information and the third accuracy information, abnormalities in weighing accuracy can be detected by using the digital filter applied to generate the first accuracy information. Even in such a case, it is possible to restart the weighing process by using the digital filter applied to generate the third accuracy information. As a result, it is possible to shorten the interruption time of the weighing process.

The measuring device may further include a notification section that notifies the occurrence of an abnormality when an abnormality is detected. In this case, the user of the measuring device can be made aware of the occurrence of an abnormality in the measuring section. As a result, the user of the weighing device is encouraged to resolve the abnormality in the weighing section, making it possible to restart the weighing process early.

The measuring device includes a storage unit that stores processing information that includes at least detection result information regarding the date and time when the first accuracy information was generated, the type of digital filter applied to the generation of the first accuracy information, or an abnormality detection result; The device may further include a display unit that displays processing information. In this case, the user of the weighing device can easily check the processing information.

According to the present disclosure, it is possible to suppress a decrease in productivity due to a decrease in measurement accuracy over time.

FIG. 1 is a schematic configuration diagram of a measuring device according to an embodiment. It is a figure showing the functional composition of a control part. 2 is a flowchart showing a first accuracy information generation process of the weighing device of FIG. 1. FIG. 2 is a flowchart showing an abnormality detection process of the weighing device of FIG. 1. FIG. 2 is a flowchart showing digital filter switching processing of the weighing device of FIG. 1. FIG. FIG. 6(a) is a diagram showing waveforms included in the original signal. FIG. 6(b) is a diagram showing a waveform after filtering the waveform shown in FIG. 6(a). FIG. 7(a) is an example of how the standard deviation changes over time in the abnormality detection process. FIG. 7(b) is an example of how the standard deviation changes over time in the measurement process. It is a schematic block diagram of the measuring device based on a modification.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. In each figure, the same or corresponding parts are denoted by the same reference numerals, and redundant explanations will be omitted.

FIG. 1 is a schematic configuration diagram of a measuring device according to an embodiment. A weighing device 1 shown in FIG. 1 is a device that weighs an object while conveying it in the direction of the arrow in FIG. 1 (hereinafter simply referred to as the "conveying direction"). The weighing device 1 is, for example, a device placed at the final line of a production line. The object to be measured is, for example, an article P extending along the conveyance direction. The weighing device 1 includes a transport section 2, a pedestal 3, a weighing section 4, and an operation section 6.

The conveyance unit 2 is a conveyance device that can convey the article P along the conveyance direction, and is, for example, a conveyor. The conveyance unit 2 conveys the article P at a conveyance speed specified via the operation unit 6, for example. The conveyance speed is specified via the operation unit 6. The conveyance section 2 includes a first conveyor section 2a, a second conveyor section 2b, and a third conveyor section 2c. Each of the first conveyor section 2a, the second conveyor section 2b, and the third conveyor section 2c includes, for example, a rotating body such as a roller or a motor, and a conveyor belt. The first conveyor section 2a, the second conveyor section 2b, and the third conveyor section 2c are arranged in order from the upstream side in the conveyance direction. That is, the second conveyor section 2b is located between the first conveyor section 2a and the third conveyor section 2c in the conveyance direction. The first conveyor section 2a is a conveyor that carries the article P into the second conveyor section 2b. The first conveyor section 2a may include, for example, a metal detector (not shown). The second conveyor section 2b is a conveyor that carries the article P conveyed from the first conveyor section 2a to the third conveyor section 2c. The third conveyor section 2c is a conveyor that carries out the article P from the second conveyor section 2b. The third conveyor section 2c includes, for example, a sorting machine (not shown) that sorts articles P whose weight deviates from the appropriate range.

A measuring section 4 is attached to the second conveyor section 2b. Therefore, the articles P transported by the transport section 2 are weighed on the second conveyor section 2b. Moreover, a sensor for detecting the presence or absence of the article P may be provided on each of the upstream side and the downstream side of the second conveyor section 2b. In this case, it can be easily determined whether the entire article P is located on the second conveyor section 2b.

The pedestal 3 is a member that accommodates the weighing section 4, and is fixed to the floor F below the transport section 2. The pedestal 3 has a main body 3a that accommodates the measuring section 4, and a plurality of legs 3b located between the main body 3a and the floor F. In FIG. 1, the main body 3a is shown in broken lines.

The weighing section 4 is a detector that measures the weight of the article P located on the second conveyor section 2b, and is located, for example, in the center of the conveyance section 2. The weighing section 4 includes a strain body 11 that receives compression and tension according to a load, and a weighing cell 12 that weighs the articles P located on the second conveyor section 2b. The strain body 11 has a movable rigid body part 11 a that supports the second conveyor part 2 b and a fixed rigid body part 11 b that is fixed to the pedestal 3 . Each of the movable rigid body part 11a and the fixed rigid body part 11b is a member extending in the vertical direction, for example. One end of the movable rigid body part 11a is connected to the upstream end of the second conveyor part 2b, and the other end of the movable rigid body part 11a is connected to the weighing cell 12. One end of the fixed rigid body part 11b is connected to the weighing cell 12, and the other end of the fixed rigid body part 11b is connected to the main body 3a of the pedestal 3. Although not shown, in the weighing cell 12, a plurality of strain gauges attached to the strain body 11 are connected to a Wheatstone bridge circuit.

In this embodiment, the measuring section 4 includes an A/D converter in addition to the strain body 11 and the measuring cell 12. The measuring cell 12 extracts an electric signal corresponding to the load transmitted from the strain body 11 from the Wheatstone bridge circuit. This electrical signal is an analog original signal corresponding to the metric component of the force applied to the second conveyor section 2b. This analog original signal is converted into a digital original signal by an A/D converter. The measuring unit 4 outputs the digital original signal to the outside (hereinafter simply referred to as "original signal"). Thereby, the amount of data output from the measuring section 4 to the operating section 6 can be reduced.

The measuring section 4 outputs an original signal corresponding to the measuring component of the force applied to the second conveyor section 2b. The measurement component is a vertically downward component of the force (load) applied to the second conveyor section 2b. When the article P is not located on the second conveyor section 2b during the operation of the conveyance section 2, the force due to vibrations generated by the weighing device 1 and the force due to vibrations generated by the surroundings of the weighing device 1 are transferred to the second conveyor section 2b. It is added to the conveyor section 2b. The vibrations generated by the weighing device 1 include vibrations associated with the operation of the transport section 2, vibrations generated when the article P is transported to the transport section 2, etc. The vibrations generated by the surroundings of the weighing device 1 include, for example, , vibrations transmitted from the floor surface on which the weighing device 1 is placed (floor vibrations), and the like. The floor vibration is, for example, vibration caused by a device installed in a production line for the article P including the weighing device 1, a device not included in the production line, or the like. When the article P is located on the second conveyor part 2b during the operation of the transport part 2, in addition to the force due to vibrations generated by the weighing device 1 and the force due to vibrations generated by the surroundings of the weighing device 1, The force due to gravity acting on the article P is applied to the second conveyor section 2b.

The operation section 6 is a control panel for operating the conveyance section 2 and the weighing section 4, and is installed, for example, in the vicinity of the second conveyor section 2b. The operation unit 6 includes a display interface 7, a control unit 8, a notification light 9, and a speaker 10.

The display interface 7 is a member (display unit) that displays various information output from the control unit 8. The display interface 7 displays, for example, a measurement value indicating the weight of the weighed article P, accuracy information indicating the weighing accuracy of the article P, the conveyance speed of the conveyance unit 2, dimensions of the article P along the conveyance direction, and conveyance of the article P. The frequency, measuring pitch of the article P, etc. are displayed. The various information output from the control unit 8 includes the date and time when first accuracy information (described later) for evaluating weighing accuracy based on the weighing signal was generated, the type of digital filter applied to generate the first accuracy information, Further, processing information such as detection result information regarding the abnormality detection result of the measuring unit 4 is included. The detection result information includes at least information that the abnormality detection result of the measuring section 4 is "abnormality detected in the measuring section 4" or "no abnormality detected in the measuring section 4". In this embodiment, the display interface 7 includes a touch panel 7a that functions as an external input section. Thereby, when the display interface 7 receives an input from the worker (user), input information indicating the input content is output to the control unit 8. The input information is, for example, data regarding the conveyance speed of the conveyor 2, the dimensions of the article P along the conveyance direction, the type of article P, the frequency of conveyance of the article P, and the like. The frequency of conveyance of the article P is set based on the capacity of a production machine located upstream of the weighing device 1, for example.

The weighing value of the article P and the accuracy information are data obtained based on a weighing signal output from the weighing section 4 to the operation section 6. Further, the weighing pitch of the article P is calculated by the control section 8 based on the conveyance speed of the conveyance section 2, the above-mentioned dimensions of the article P, and the conveyance frequency of the article P.

The control section 8 is a controller that controls each member included in the weighing device 1, and is built into the operation section 6. The control unit 8 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like. The control unit 8 outputs, to the transport unit 2, an operation signal for controlling the transport speed of the transport unit 2 specified via the display interface 7, for example. For example, if the third conveyor section 2c is provided with a sorting machine and the control section 8 determines that the weight of the article P deviates from a preset appropriate range, the control section 8 outputs an operation signal to the sorting machine so that the article P is sorted (excluded from the line). The control unit 8 not only controls each member included in the weighing device 1, but also receives/calculates/transmits various signals, records/reads various signals, and the like. An example of the calculation of various signals by the control unit 8 is derivation of the weighing result of the article P. The control unit 8 includes, for example, a drive circuit for outputting a control signal to the conveyance unit 2, a drive circuit for calculating the weighing value of the article P from the weighing signal generated by the weighing unit 4, and a drive circuit for calculating the weighing value of the article P from the weighing signal. It has a drive circuit for calculating accuracy information, a storage circuit for storing each signal and each information, and the like. That is, the control unit 8 is a processing unit that applies a digital filter to the original signal to generate a measurement signal, and performs measurement processing based on the measurement signal. The weighing process refers to a process of generating a weight value of the article P when the article P is located on the second conveyor section 2b during the operation of the conveyor section 2.

The notification light 9 is a signal tower that emits light depending on the operating status of the weighing device 1 and the like. The notification light 9 can emit red, yellow, and green light, for example. The speaker 10 emits a sound (for example, a buzzer sound) depending on the operating status of the weighing device 1 and the like. The display interface 7 and the notification light 9 function as a notification unit that emits light depending on the operating status of the weighing device 1 and the like. The speaker 10 functions as a notification section that emits sound depending on the operating status of the weighing device 1 and the like.

The operating status of the weighing device 1 includes an abnormality in the weighing section 4 that occurred after the first accuracy information was generated. Abnormalities in the weighing section 4 include abnormalities in the weight value (so-called zero point) serving as a reference for measurement. The first accuracy information is generated when the weighing device 1 is installed at the installation location (for example, a production line for the article P including the weighing device 1), before manufacturing and weighing the article P (for example, before starting a weight inspection). ). An abnormality in the measuring unit 4 may be, for example, a state in which the accuracy information varies beyond an allowable range that takes a predetermined margin into account with respect to the generated first accuracy information. If an abnormality occurs in the measuring section 4, the measuring accuracy of the measuring device 1 will deteriorate over time.

FIG. 2 is a diagram showing the functional configuration of the control section. As shown in FIG. 2, the control section 8 includes a reception section 21, a filter section 22, a calculation section 23, an output section 24, and a storage section 25.

The receiving unit 21 is a part that receives, for example, a measurement signal output from the measurement unit 4 and input information transmitted from the display interface 7. The output of the measurement signal from the measurement unit 4 to the reception unit 21 and the transmission of input information from the display interface 7 to the reception unit 21 may be performed via wired or wireless. You can. The receiving unit 21 may receive data other than the measurement signal and input information.

The filter section 22 is a section that filters the original signal using a plurality of digital filters stored in advance. Each of the plurality of digital filters is composed of a low-pass filter that attenuates frequency components exceeding a predetermined frequency, a notch filter (bandstop filter) that attenuates frequency noise of the rotating body included in the conveyance section 2, and the like. . That is, when at least some of the plurality of digital filters are selected, the filter section 22 can perform multi-stage filtering processing on the original signal. Each digital filter may include one or more low pass filters and one or more notch filters. Each of the plurality of digital filters may include low-pass filters that attenuate different frequency bands, or may include notch filters that attenuate different frequency bands. The plurality of low-pass filters may be variable filters described in, for example, Japanese Patent No. 5901126.

As a weighing process, the filter unit 22 filters the original signal using one digital filter selected in advance from a plurality of digital filters while the transport unit 2 is operating and the article P is being transported. . The filter section 22 then generates a signal (metric signal) after the filtering process. The obtained measurement signal is output to, for example, the calculation section 23, the storage section 25, etc. included in the control section 8 shown in FIG. The weighing signal has a waveform arranged to perform weighing processing to calculate the weight of the article P.

The filter unit 22 filters an original signal obtained when the transport unit 2 is in operation and the article P is not being transported by the transport unit 2 (hereinafter also referred to as “dry operation of the transport unit 2”). Apply each of multiple digital filters. In other words, the filter section 22 performs filtering processing that applies each of a plurality of digital filters to the original signal while the conveyance section 2 is running idle. Thereby, the filter section 22 generates a plurality of measurement signals that are the results of applying each of the plurality of digital filters to the original signal obtained while the conveyance section 2 is running idle. The filter section 22 then outputs the plurality of measurement signals to the calculation section 23, the storage section 25, and the like. Note that whether or not the transport section 2 is in idle operation may be determined by the operator or automatically. For example, when the conveyance section 2 is in operation and the non-detection state of the sensor for detecting articles provided in the weighing device 1 continues for a predetermined period of time or more, if the conveyance section 2 is in idle operation, the may be judged.

In the present embodiment, the signal output from the weighing section 4 when the conveying section 2 is operated idly at the scheduled conveying speed specified via the display interface 7 indicates that the conveying section 2 is in operation and is being conveyed. This corresponds to the original signal obtained when the article P is not being transported by the section 2. For example, when the plurality of digital filters include first to third filters, each of the first to third filters performs filtering processing on the original signal. Thereby, the first metric signal obtained by applying the first filter, the second metric signal obtained by applying the second filter, and the third metric signal obtained by applying the third filter. A weighing signal is obtained.

The calculation unit 23 is a part that performs calculation processing on various input information. As a weighing process, the calculating section 23 calculates the weight of the article P based on the weighing signal output from the filter section 22 when the article P is located on the second conveyor section 2b during the operation of the conveying section 2. Perform weighing process. Thereby, the calculation unit 23 generates the weight value of the article P. The calculation unit 23 outputs the generated measurement value to the output unit 24. The calculation unit 23 calculates the weighing pitch (weighing interval) of the article P based on the input conveyance speed of the conveyance unit 2, dimensions of the article P, and conveyance frequency. The calculation unit 23 determines whether the weight of the article P deviates from a preset appropriate range based on the measured value. According to this determination result, the calculation unit 23 outputs an operation signal to, for example, a sorting machine.

The calculation unit 23 calculates the obtained value when the transport unit 2 is in operation and the transport unit 2 is not transporting the product P before manufacturing and weighing the product P when it is installed at the installation location of the weighing device 1. One of the plurality of digital filters is selected based on the result of applying each of the plurality of digital filters to the obtained original signal. In the present embodiment, the calculation unit 23 is based on a plurality of weighing signals obtained during idle operation of the conveyance unit 2 before manufacturing and weighing the article P when installed at the installation location of the weighing device 1. Generate multiple accuracy information. Subsequently, the calculation unit 23 compares the plural pieces of accuracy information. Here, the first accuracy information, which is the most appropriate accuracy information among the plurality of measurement signals, is accuracy information for evaluating measurement accuracy based on the measurement signals. The calculation unit 23 determines the most appropriate accuracy information as the first accuracy information. Subsequently, the calculation unit 23 selects a digital filter corresponding to the first accuracy information.

The accuracy information is calculated, for example, based on the standard deviation of the amplitude of the waveform included in the measurement signal. This calculation result may be the standard deviation of the waveform amplitude itself, or a parameter based on the standard deviation. The first accuracy information here is the standard deviation σ _a of the amplitude of the waveform included in the measurement signal. The calculation unit 23 compares the standard deviation of the amplitude for each waveform obtained by applying each of the plurality of digital filters to the original signal, and selects the digital filter from which the smallest standard deviation is obtained as the first accuracy information. . For example, when the plurality of digital filters have first to third filters, the calculation unit 23 calculates the first standard deviation of the amplitude of the waveform included in the first measurement signal and the amplitude of the waveform included in the second measurement signal. and a third standard deviation of the amplitude of the waveform included in the third measurement signal. Subsequently, the calculation unit 23 specifies the standard deviation σ _a that is the smallest value among the first standard deviation, the second standard deviation, and the third standard deviation as the first accuracy information. Then, the calculation unit 23 selects the digital filter applied to the measurement signal having the first accuracy information. Then, the calculation unit 23 outputs the date and time when the first accuracy information was generated and the type of digital filter applied to the generation of the first accuracy information to the storage unit 25 as information regarding the first accuracy information and the selected digital filter. do. The storage unit 25 stores the date and time when the first accuracy information was generated and the type of digital filter applied to generate the first accuracy information.

The waveform included in the weighing signal includes vibrations generated by the weighing device 1 and its surroundings. The vibration becomes noise for weighing the article P. Therefore, it can be determined that the smaller the standard deviation of the amplitude of the waveform, the smaller the noise in the weighing of the article P.

Here, the calculation unit 23 performs an abnormality detection process to detect an abnormality in the measuring unit 4 that has occurred after the generation of the first accuracy information, based on the stored first accuracy information. The weighing signal used for the abnormality detection process may be a period after the start of production of the article P while the conveyor section 2 is in operation and the article P is not located on the second conveyor section 2b. This applies to the period between weight inspections of the article P, etc.

For example, after generating the first accuracy information, the calculation unit 23 further generates second accuracy information for evaluating changes in measurement accuracy over time. The second accuracy information is accuracy information for detecting an abnormality in the measuring section 4 using the first accuracy information as a reference. The second accuracy information is calculated, for example, based on the standard deviation of the amplitude of the waveform included in the measurement signal after the first accuracy information is generated. This calculation result may be the standard deviation of the waveform amplitude itself, or a parameter based on the standard deviation. The second accuracy information is the standard deviation σ _b of the amplitude of the waveform included in the measurement signal after the generation of the first accuracy information. The standard deviation σ _b of the second accuracy information is the standard deviation of the amplitude of the waveform included in the weighing signal during a preset constant standard deviation acquisition period after the generation of the first accuracy information (for example, after the start of production of the article P). It can be a deviation. The constant standard deviation acquisition period is a continuous period or a period during which the conveyance section 2 is in operation and the article P is not located on the second conveyor section 2b after the production of the article P is started after the generation of the first accuracy information. This corresponds to an intermittent extension period, and may be, for example, a total of 30 minutes, although it is not particularly limited. As an example, the standard deviation σ _b can be expressed as a standard deviation calculated using data (in this case, 3000 samples) of the amplitude values of the waveform included in the weighing signal 100 times per minute during the standard deviation acquisition period. good.

The calculation unit 23 may detect an abnormality in the measuring unit 4 based on the comparison result between the first accuracy information and the second accuracy information as an abnormality detection process. For example, the calculation unit 23 compares the standard deviation σ _a of the first accuracy information with the standard deviation σ _b of the second accuracy information, and calculates that the standard deviation σ b is lower than the threshold Th1 obtained by multiplying the standard deviation _{σ a} by a predetermined margin. If is large, an abnormality in the measuring section 4 is detected. For example, the calculation unit 23 does not detect an abnormality in the measuring unit 4 when the standard deviation σ _b is less than or equal to the threshold Th1. The predetermined margin may be, for example, a predetermined coefficient of about 1.5 to 3.0. Note that the output unit 24 may or may not necessarily stop the weighing device 1 when the calculation unit 23 detects an abnormality in the weighing unit 4 . Further, the output unit 24 may graph the standard deviation σ _b of the second accuracy information and display it on the touch panel 7a. In this case, the output unit 24 may further display the standard deviation σ _a of the first accuracy information on the touch panel 7a.

When the calculation unit 23 detects an abnormality in the measuring unit 4 through the abnormality detection process, the calculation unit 23 automatically switches from the digital filter applied to generate the first accuracy information to a digital filter that does not detect the abnormality in the measuring unit 4. good. For example, when an abnormality in the weighing section 4 is detected through the abnormality detection process, the calculation section 23 calculates whether the transport section 2 is in operation and the article P is on the second conveyor section after the start of production of the article P after the abnormality in the weighing section 4 has been detected. 2b, a digital filter different from the digital filter applied to generate the first accuracy information is applied, and the measurement accuracy with the different digital filter is evaluated. Generate third accuracy information. The original signal in this case may be an original signal after the time when the abnormality of the measuring section 4 is detected.

The calculation unit 23 selects either the different digital filter or a predetermined default digital filter and performs the measurement process, for example, based on the comparison result between the first accuracy information and the third accuracy information. The third accuracy information is accuracy information for evaluating the measurement accuracy using a digital filter different from the digital filter applied to generate the first accuracy information upon detection of an abnormality in the measurement unit 4. The third accuracy information is, for example, a weighing signal during a period during which the conveying section 2 is in operation and the article P is not located on the second conveyor section 2b after the start of production of the article P after detecting an abnormality in the weighing section 4. Calculated based on the standard deviation of the amplitude of the waveform included in. This calculation result may be the standard deviation of the waveform amplitude itself, or a parameter based on the standard deviation. The third accuracy information is included in the weighing signal during the period during which the conveyance section 2 is in operation and the article P is not located on the second conveyor section 2b after the start of production of the article P after an abnormality in the weighing section 4 is detected. is the standard deviation σ _c of the amplitude of the waveform. The standard deviation σ _c of the third accuracy information is determined, for example, after an abnormality in the weighing unit 4 is detected, in the same way as the standard deviation σ _b described above. This can be the standard deviation of the amplitude of the waveform included in the weighing signal during the standard deviation acquisition period during the period when P is not located on the second conveyor section 2b.

For example, the calculation unit 23 compares the standard deviation σ _a of the first accuracy information with the standard deviation σ _c of the third accuracy information, and if the standard deviation σ _c is equal to or less than the standard deviation σ _a , the third accuracy information Switch to the digital filter applied to the generation of. For example, when the standard deviation σ _c is larger than the standard deviation σ _a , the calculation unit 23 switches to the default digital filter. Note that the default digital filter is a digital filter that is used with standard settings among multiple digital filters, and is used for general purpose use under a wide range of conditions rather than prioritizing the convergence of weighing signals under specific conditions. It is a digital filter with possible convergence. Note that the digital filter switching process by the arithmetic unit 23 described above may be performed automatically, or may be performed in response to an input operation by the operator on the touch panel 7a or the like. When performed in response to an input operation, the output unit 24 may prompt the operator of the weighing device 1 to perform the input operation, for example, by displaying predetermined characters and/or images on the touch panel 7a.

The output unit 24 outputs, for example, various information and various signals generated by the control unit 8 and various information and various signals stored in the storage unit 25 to the outside. The output unit 24 outputs, for example, the measured value of the article P, accuracy information, first accuracy information, weighing pitch, etc. to the display interface 7 as display information. The output unit 24 displays, as display information, the date and time when the first accuracy information was generated, the type of digital filter applied to generate the first accuracy information, or processing information that includes at least detection result information regarding abnormality detection results. Output to interface 7. The output unit 24 outputs an operation signal for controlling the conveyance speed of the conveyance unit 2 to the conveyance unit 2, and outputs an operation signal for the sorting machine to the sorting machine. The output of the operation signal from the output unit 24 to the transport unit 2, etc. may be performed via a wire or wirelessly.

When an abnormality in the measuring section 4 is detected by the abnormality detection process, the output section 24 outputs an output to at least one of the display interface 7, the warning light 9, and the speaker 10 to notify the occurrence of the abnormality in the measuring section 4. Good too. The occurrence of an abnormality in the measuring section 4 can be notified by, for example, turning on the notification light 9, making a buzzer sound from the speaker 10, displaying the screen on the touch panel 7a, and notifying a remote terminal.

The storage unit 25 stores input information input via the display interface 7 and various information and signals generated by the control unit 8. The storage unit 25 stores a plurality of digital filters in advance. The storage unit 25 stores, for example, processing information including at least the date and time when the first accuracy information was generated, the type of digital filter applied to the generation of the first accuracy information, or detection result information regarding abnormality detection results. The storage unit 25 stores, for example, the standard deviation σ _a of the first accuracy information. The storage unit 25 may store the standard deviation σ _b of the second accuracy information and the standard deviation σ _c of the third accuracy information.

Next, each process performed by the control section 8 of the weighing device 1 will be explained with reference to FIGS. 3 to 5. FIG. 3 is a flowchart showing the first accuracy information generation process of the weighing device 1. The process shown in FIG. 3 is performed when the weighing device 1 is installed at the installation location (for example, a production line for the article P including the weighing device 1), before manufacturing and weighing the article P (for example, before starting a weight inspection). It will be done.

First, the conveyance speed of the conveyance section 2 is determined (step S01). In step S01, the conveyance speed of the conveyance unit 2 is specified via the display interface 7. At this time, the operator may input the conveyance speed itself of the conveyance section 2 via the display interface 7, or may input the conveyance frequency of the article P.

An original signal is obtained when the conveyance section 2 is operated in a state where the article P is not conveyed (when the conveyance section 2 is running idle) (step S02). In step S02, for example, the weighing unit 4 acquires an original signal obtained when the carrying unit 2 is idle-operated for about 5 seconds at a specified carrying speed before weighing the article P. The acquired original signal is output to the control section 8.

Each of the plurality of digital filters is applied to the acquired original signal (step S03). In step S03, the filter unit 22 applies each of a plurality of digital filters to the original signal to perform filtering processing. Thereby, the filter section 22 acquires a plurality of measurement signals.

The standard deviation of the amplitude of each waveform after the filtering process is compared (step S04). In step S04, first, the calculation unit 23 calculates the standard deviation of the amplitude of the waveform included in each of the plurality of measurement signals. Subsequently, the calculation unit 23 compares the magnitude of each standard deviation. Here, the calculation unit 23 determines the waveform from which the smallest standard deviation (standard deviation σ _a of the first accuracy information) is obtained among the plurality of standard deviations.

One digital filter is selected from the plurality of digital filters (step S05). In step S05, the calculation unit 23 selects the digital filter used to generate the metric signal having the waveform that provides the smallest standard deviation. After that, the first accuracy information is stored (step S06). In step S06, the storage unit 25 stores the standard deviation σ _a as first accuracy information. As described above, the setting of the digital filter used when weighing the article P at the designated transport speed is automatically reserved.

FIG. 4 is a flowchart showing the abnormality detection process of the weighing device 1. The process in FIG. 4 is performed after the first accuracy information is generated, for example, after the start of production of the article P after the first accuracy information is generated, while the transport section 2 is in operation.

An original signal is obtained when the transport section 2 is operated in a state where the article P is not transported (step S11). In step S11, for example, the weighing section 4 calculates the original value of the period during which the conveyance section 2 is operated at the specified conveyance speed for about 5 seconds and the article P is not located on the second conveyor section 2b. Get the signal. The acquired original signal is output to the control section 8.

For example, the same digital filter as that used to generate the first accuracy information is applied to the original signal to generate second accuracy information (step S12). In step S12, the calculation unit 23 calculates the original signal for a period during which the conveyance unit 2 is in operation and the article P is not located on the second conveyor unit 2b after the production of the article P after the generation of the first accuracy information is started. Based on the second accuracy information, the same digital filter as that used to generate the first accuracy information is applied to generate the second accuracy information.

The first standard deviation (standard deviation σ _a of the first accuracy information) and the second standard deviation (standard deviation σ _b of the second accuracy information) are compared (step S13). In step S13, the calculation unit 23 compares, for example, a threshold Th1 obtained by multiplying the standard deviation σ _a by a predetermined margin with the standard deviation σ _b .

It is determined whether the second standard deviation is larger than a threshold Th1 obtained by multiplying the first standard deviation by a predetermined margin (step S14). For example, when the second standard deviation is larger than the threshold Th1 obtained by multiplying the first standard deviation by a predetermined margin (step S14: YES), the calculation unit 23 detects an abnormality (step S15). On the other hand, if the second standard deviation is less than or equal to the threshold Th1 (step S14: NO), the calculation unit 23 directly ends the process of FIG. 4 without detecting any abnormality.

Here, the digital filter is automatically switched when an abnormality is detected (step S16). In step S16, specifically, the digital filter switching process shown in FIG. 5 is performed.

FIG. 5 is a flowchart showing the digital filter switching process of the weighing device 1. As shown in FIG. 5, after the detection of an abnormality, the original signal for the period during which the conveying section 2 is in operation and the article P is not located on the second conveyor section 2b is acquired (step S21). In step S21, for example, the weighing section 4 calculates the original value of the period when the conveyance section 2 is operated at the specified conveyance speed for about 5 seconds and the article P is not located on the second conveyor section 2b. Get the signal. The acquired original signal is output to the control section 8.

A digital filter different from that used to generate the first accuracy information is applied to the original signal to generate third accuracy information (step S22). In step S22, the calculation unit 23 generates first accuracy information based on the original signal during the period during which the conveyance unit 2 is in operation and the article P is not located on the second conveyor unit 2b after the abnormality is detected. The third accuracy information is generated by applying a digital filter different from that used in the third accuracy information.

The first standard deviation (standard deviation σ _a of the first accuracy information) and the third standard deviation (standard deviation σ _c of the third accuracy information) are compared (step S23). In step S23, the calculation unit 23 compares, for example, the standard deviation σ _a of the first accuracy information and the standard deviation σ _c of the third accuracy information.

It is determined whether the third standard deviation is less than or equal to the first standard deviation (step S24). For example, when the third standard deviation is less than or equal to the first standard deviation (step S24: YES), the calculation unit 23 switches to the digital filter applied to the third accuracy information (step S25). On the other hand, the calculation unit 23 switches to the default digital filter, for example, when the third standard deviation is larger than the first standard deviation (step S24: NO).

Returning to FIG. 4, the occurrence of an abnormality in the measuring section 4 is notified (step S17). In step S17, the output section 24 outputs an output to at least one of the display interface 7, the notification light 9, and the speaker 10 to notify the occurrence of an abnormality in the measuring section 4, for example. The occurrence of an abnormality in the measuring section 4 is notified by, for example, turning on the notification light 9, making a buzzer sound from the speaker 10, displaying a screen on the touch panel 7a, and notifying a remote terminal.

Next, the operation of the weighing device 1 will be explained with reference to FIGS. 6 and 7. FIG. 6(a) is a diagram showing waveforms included in the original signal. FIG. 6(b) is a diagram showing a waveform after filtering the waveform shown in FIG. 6(a).

FIG. 6A shows a waveform 51 of an original signal for calculating the weight of the article P acquired by the weighing unit 4 of the weighing device 1 when the transport unit 2 is transported at a predetermined speed. The waveform includes noise caused by the weighing device 1 and its surroundings. Therefore, the noise is usually removed by filtering the waveform.

FIG. 6B shows waveforms 52 and 53 after filtering the waveform 51 using a plurality of digital filters. The waveform 52 is a waveform obtained by applying one digital filter among a plurality of digital filters. The waveform 53 is a waveform of a measurement signal obtained by applying a digital filter different from the digital filter applied to the waveform 52 among the plurality of digital filters. According to FIG. 6(b), noise in waveform 53 tends to be removed more than in waveform 52. Therefore, when the weighing device 1 weighs the article P at the predetermined speed, the digital filter applied to the waveform 53 is more appropriate under the conditions of FIG. 6 than the digital filter applied to the waveform 52. , it is estimated that the article P is weighed with small variations in weight. Therefore, the digital filter applied to the waveform 53 is selected as the digital filter corresponding to the first accuracy information, and the standard deviation of the amplitude of the waveform 53 is stored in the storage unit 25 as the standard deviation σ _a of the first accuracy information.

FIG. 7(a) is an example of how the standard deviation changes over time in the abnormality detection process. FIG. 7A shows a standard deviation σ _a of the first accuracy information, a threshold Th1 obtained by multiplying the standard deviation σ _a by a predetermined margin, and a standard deviation σ _b of the second accuracy information. The times t1 to t6 are each included in a period after the generation of the first accuracy information and after the start of production of the article P while the conveyor section 2 is in operation and the article P is not located on the second conveyor section 2b. It's time to start. The times t1 to t6 may be, for example, the time when the idle operation in the idle operation period between multiple weight inspections ends (the time when the article detection sensor enters the detection state).

In FIG. 7A, from time t1 to time t5, the standard deviation σ _b of the second precision information is less than or equal to the threshold Th 1 obtained by multiplying the standard deviation σ _a by a predetermined margin. Therefore, no abnormality in the measuring section 4 is detected from time t1 to time t5. However, after it is installed at the installation location, the conditions of the measuring device 1 and its surroundings (for example, abnormalities in the measuring section 4, vibrations of the measuring device 1 itself, vibrations transmitted to the measuring device 1 from the outside, etc.) may change over time. As a result, the standard deviation σ _b of the second accuracy information increases over time. As a result, at time t6, the standard deviation σ _b corresponding to the variation in accuracy information from the zero point increases by a certain amount or more from the initially acquired standard deviation σ _a and exceeds the threshold Th1. That is, at time t6, the standard deviation σ _b of the second accuracy information becomes larger than the threshold Th1 obtained by multiplying the standard deviation σ _a by a predetermined margin, and as a result, an abnormality in the measuring unit 4 is detected at time t6.

Incidentally, in addition to detecting an abnormality in the weighing section 4 while the conveying section 2 is running idle, the control section 8 also detects abnormalities in the weighing section 4 while the conveying section 2 is in operation (that is, while the conveying section 2 is in operation and the article P is being conveyed). ) An abnormal increase in the transfer noise of the article P conveyed from the first conveyor section 2a to the second conveyor section 2b (an abnormality due to improper setting of the digital filter), and an abnormality in article weight variation (for example, an abnormality due to improper setting of the digital filter) An abnormality in which the weight of the article P itself increases (an abnormality in which the weight of the article P itself increases) due to an abnormality in a production machine located upstream of the apparatus 1 may be detected. These abnormalities may occur, for example, when the standard deviation of the amplitude of the waveform included in the weighing signal generated based on the original signal during the operation of the transport unit 2 and during the transport of the article P exceeds a certain value from the initially obtained standard deviation σ _a. If it increases, it may be detected.

FIG. 7(b) is an example of how the standard deviation changes over time in the measurement process. FIG. 7(b) shows the standard deviation of the first accuracy information obtained based on the original signal when the transport unit 2 is in operation and the article P is not being transported by the transport unit 2 (idle operation). σ _a , the threshold Th2 obtained by multiplying the standard deviation σ _a of the first accuracy information by a predetermined margin, and the original signal obtained after the first accuracy information is acquired while the transport unit 2 is operating and the article P is being transported. The standard deviation σ _Pb is shown.

In FIG. 7B, as an example, the standard deviation σ _Pb is calculated for each transport of the article P. For example, times t10, t12, t14, and t16 correspond to the times when the article detection sensors are in the detection state, and times t11, t13, t15, and t17 are the times when the article detection sensors are in the non-detection state. Corresponds to time. That is, during each period of time t10 to t11, t12 to t13, t14 to t15, and t16 to t17, the article P is located on the second conveyor section 2b. Note that the timing for calculating the standard deviation σ _Pb is not limited to this.

In FIG. 7B, the standard deviation σ _Pb calculated at times t11, t13, and t15 is less than or equal to the threshold Th2. Therefore, at times t11, t13, and t15, no abnormal increase in transfer noise or abnormality in article weight variation is detected. However, noise caused by transfer of the article P conveyed from the first conveyor section 2a to the second conveyor section 2b, and/or variations in the weight of the article P itself in the production machine located upstream of the weighing device 1 over time. As a result, the standard deviation σ _Pb is increasing over time. As a result, the standard deviation σ _Pb exceeds the threshold Th2 at time t17. That is, an article measurement abnormality is detected at time t17.

As explained above, according to the weighing device 1, when the article P is not located on the second conveyor section 2b during the operation of the conveyor section 2, the first Accuracy information is generated. An abnormality in the measuring section 4 is detected based on the generated first accuracy information. In this way, the first accuracy information when the article P is not located on the second conveyor section 2b during the operation of the conveyor section 2 is used as a reference to calculate changes over time in the weighing device 1 and the surrounding situation. By capturing (for example, an increase in floor vibration) as a change in accuracy information with respect to the standard, an abnormality in the measuring unit 4 can be detected earlier than when detection is not performed based on the standard. As a result, it becomes possible to quickly resolve the abnormality in the measuring section 4 and restart the measuring process, thereby making it possible to suppress a decrease in productivity due to a decrease in measuring accuracy over time.

After generating the first accuracy information, the control unit 8 further generates second accuracy information for evaluating changes in weighing accuracy over time, and detects abnormalities based on the comparison result between the first accuracy information and the second accuracy information. Detect. Thereby, by evaluating the second accuracy information based on the first accuracy information, even non-experts can easily evaluate changes over time in the measurement accuracy.

The control unit 8 stores a plurality of digital filters in advance, and when an abnormality is detected, it applies a digital filter different from the digital filter applied to generate the first accuracy information, and performs measurement using the different digital filter. Generate third accuracy information for evaluating accuracy, and select and weigh either the different digital filter or a predetermined default digital filter based on the comparison result between the first accuracy information and the third accuracy information. Perform processing. As a result, by automatically switching the digital filter based on the comparison result between the first accuracy information and the third accuracy information, abnormalities in weighing accuracy are detected when the digital filter applied to generate the first accuracy information is used. Even in such a case, it is possible to restart the weighing process by using the digital filter applied to generate the third accuracy information. As a result, it is possible to shorten the interruption time of the weighing process.

The weighing device 1 further includes a notification light 9 and a speaker 10 as a notification section that notifies the occurrence of an abnormality when an abnormality is detected. Thereby, the user of the weighing device 1 can be made aware of the occurrence of an abnormality in the weighing section 4. As a result, the user of the weighing device 1 is encouraged to resolve the abnormality in the weighing section 4, and it becomes possible to restart the weighing process at an early stage.

The weighing device 1 includes a storage unit 25 that stores processing information including at least detection result information regarding the date and time when the first accuracy information was generated, the type of digital filter applied to the generation of the first accuracy information, or abnormality detection results. , and a touch panel 7a of a display interface 7 for displaying processing information. Thereby, the user of the weighing device 1 can easily check the processing information.

Although the embodiments and modifications thereof of the measuring device according to the present disclosure have been described above, the present disclosure is not limited to the embodiments and modifications thereof. For example, the weighing device 1 can be modified like a weighing device 1A shown in FIG. In the description of the weighing device 1A, description of parts that overlap with the above embodiment will be omitted. Therefore, in the following, parts that are different from the above embodiment will be mainly explained.

FIG. 8 is a schematic configuration diagram of a weighing device 1A according to a modification. As shown in FIG. 8, the weighing device 1A is a device for weighing the long article P1 along the conveyance direction, and includes a first weighing section 4A and a second weighing section 5. The first measuring section 4A is located upstream of the second conveyor section 2b. The second weighing section 5 is located downstream of the second conveyor section 2b, and includes a strain body 31 and a weighing cell 32. Like the strain body 11, the strain body 31 includes a movable rigid body portion 31a that supports the second conveyor portion 2b, and a fixed rigid body portion 31b fixed to the pedestal 3.

When the transport section 2 is in operation and the article P1 is not transported by the transport section 2, the filter section 22 of the control section 8 uses, for example, the first original signal output from the first measuring section 4A and the second signal. One of the plurality of digital filters is selected for each of the second original signals output from the measuring section 5. In this case, the digital filter selected based on the first original signal and the digital filter selected based on the second original signal may be the same or different. In this case, while the transport section 2 is in operation and the article P1 is being transported by the transport section 2, a weighing signal obtained by filtering the original signal output from the first weighing section 4A and a weighing signal from the second weighing section 5 are used. The metric signal obtained by filtering the output original signal is summed. The standard deviation σ _a of the first accuracy information, the standard deviation σ _b of the second accuracy information, and the standard deviation σ _c of the third accuracy information are calculated based on the total measurement signal obtained by this, and the same as in the above embodiment. Then, first accuracy information generation processing, abnormality detection processing, and digital filter switching processing are performed. Further, the calculation unit 23 of the control unit 8 generates the weight value of the article P1 based on the total weight signal.

Alternatively, the filter unit 22 of the control unit 8 may, for example, generate a total original signal of the first original signal output from the first measurement unit 4A and the second original signal output from the second measurement unit 5, Select one digital filter from a plurality of digital filters. In this case, the control section 8 first generates a total original signal by adding up the first original signal output from the first measurement section 4A and the second original signal output from the second measurement section 5. Then, the calculation unit 23 selects one digital filter from among the plurality of digital filters for the summed original signal. In this case, while the transport section 2 is in operation and the article P1 is being transported by the transport section 2, the original signal output from the first weighing section 4A and the original signal output from the second weighing section 5 are summed. . Based on the metric signal obtained by filtering the combined original signal obtained, the standard deviation σ _a of the first accuracy information, the standard deviation σ _b of the second accuracy information, and the standard deviation σ of the third accuracy information are determined. _c is calculated, and the first accuracy information generation process, abnormality detection process, and digital filter switching process are performed in the same manner as in the above embodiment. Further, the calculation unit 23 of the control unit 8 generates the weight value of the article P based on the weight signal obtained by filtering the total original signal.

Also in such a weighing device 1A, the same effects as in the above embodiment are achieved. In addition, according to the weighing device 1A, it is possible to accurately weigh the long article P1 along the conveyance direction.

In the above embodiment and the above modification, the accuracy information is calculated based on the standard deviation of the amplitude of the waveform obtained by applying a digital filter to the original signal, but the accuracy information is not limited thereto. For example, the accuracy information may be calculated based on a value at an arbitrary point on a waveform obtained by applying a digital filter to the original signal. Furthermore, for example, the accuracy information may be calculated based on the bias of the zero points of the waveform (for example, the average value of the measurement signal) included in the measurement signal obtained by applying a digital filter to the original signal, or the It may be calculated based on both the deviation and bias. Further, for example, the accuracy information may be calculated based on the standard deviation of the differential value of the amplitude of a waveform obtained by applying a digital filter to the original signal. This calculation result may be the standard deviation itself of the differential value of the waveform amplitude. In these cases, the influence of vibrations that occur when conveying articles to the weighing device can be reduced. Therefore, it becomes easier to automatically select a digital filter suitable for the weighing device and its surroundings. Alternatively, the accuracy information may be calculated based on the standard deviation of the second derivative of the amplitude of a waveform obtained by applying a digital filter to the original signal. This calculation result may be the standard deviation itself of the second-order differential value of the waveform amplitude. Alternatively, the accuracy information may be calculated by subtracting the minimum amplitude value from the maximum amplitude value of the waveform. In this case, accuracy information can be easily calculated.

In the above embodiment and the above modification, the measuring section uses the digital signal as the original signal and outputs it to the outside, but the present invention is not limited thereto. The measuring section may output the acquired analog signal to the outside as an original signal. In this case, for example, the control section may convert the analog signal into digital.

In the embodiment and the modified example described above, the second accuracy information is generated for the measurement signal obtained by applying the same digital filter as that applied to the generation of the first accuracy information to the original signal, and the second accuracy information is generated from the first accuracy information. Although the abnormality was detected based on the comparison result with the second accuracy information, the present invention is not limited to this. For example, when generating the second accuracy information, a digital filter different from that applied to generate the first accuracy information may be applied to the original signal, or a digital filter may not be applied to the original signal.

In the embodiment and the modification described above, the third accuracy information is generated for the measurement signal obtained by applying a digital filter different from that applied to the generation of the first accuracy information to the original signal, and the third accuracy information is generated from the first accuracy information. Although the digital filter switching process was performed based on the comparison result with the third accuracy information, the present invention is not limited thereto. For example, it is not necessary to generate the third accuracy information. In this case, it may be automatically switched to the default digital filter. Alternatively, the digital filter switching process itself may be omitted. In this case, step S16 in FIG. 4 and the process in FIG. 5 may be omitted.

In the embodiment and the modification described above, the weighing devices 1 and 1A were provided with the touch panel 7a, the notification light 9, and the speaker 10 as the notification section, but some of these may be omitted. Further, all of these may be omitted. In this case, step S17 in FIG. 4 may be omitted.

DESCRIPTION OF SYMBOLS 1, 1A... Weighing device, 2... Conveying part, 3... Frame, 4... Measuring part, 4A... First measuring part (measuring part), 5... Second measuring part (measuring part), 6... Operation part, 7... Display interface (display section), 8... Control section (processing section), 9... Notification light (notification section), 10... Speaker (notification section), 11, 31... Strain body, 11a, 31a... Movable rigid body section, 11b , 31b...Fixed rigid body section, 12, 32...Measuring cell, 21...Receiving section, 22...Filter section (processing section), 23...Calculating section (processing section), 24...Output section, 25...Storage section, P, P1 ...Goods.

Claims (4)

a transport unit capable of transporting articles;
a measuring section that outputs an original signal corresponding to a measuring component of the force applied to the conveying section;
a processing unit that applies a digital filter to the original signal to generate a weighing signal and performs weighing processing based on the weighing signal,
The processing unit includes:
If the article is not located on the conveyance unit during operation of the conveyance unit, first accuracy information for evaluating weighing accuracy is generated based on the weighing signal, and the first accuracy information is based on the generated first accuracy information. detecting an abnormality in the measuring section based on the
Multiple digital filters are stored in advance,
When the abnormality is detected, third accuracy information for evaluating the weighing accuracy with the different digital filter by applying the digital filter different from the digital filter applied to generate the first accuracy information. generate,
A weighing device that performs the weighing process by selecting either the different digital filter or the predetermined default digital filter based on a comparison result between the first precision information and the third precision information. After generating the first accuracy information, the processing unit further generates second accuracy information for evaluating changes over time in the weighing accuracy, and compares the first accuracy information and the second accuracy information. The measuring device according to claim 1, wherein the abnormality is detected based on. The weighing device according to claim 1 or 2 , further comprising a notification unit that notifies the occurrence of the abnormality when the abnormality is detected. a storage unit that stores processing information including at least date and time when the first accuracy information was generated, the type of the digital filter applied to the generation of the first accuracy information, or detection result information regarding the abnormality detection result;
The weighing device according to any one of claims 1 to 3 , further comprising a display unit that displays the processing information.

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