JP2019103976A - Crusher, arithmetic device, notification method, and program - Google Patents

Abstract

To perform maintenance on a crusher at proper timing.SOLUTION: A pulverizer 1 includes: a pulverizing mechanism 10 having a concave and a mantle; a lubrication oil supply mechanism 20 including a pump to supply lubrication oil to the pulverizing mechanism 10; a measuring device 30 for measuring pressure of the lubrication oil supplied from the lubrication oil supply mechanism 20; and an arithmetic device 40 for notifying maintenance timing based on a reduction rate from a reference value of the pressure of the lubrication oil.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a crusher, an arithmetic device, a notification method and a program.

  In a crusher having a concave and a mantle, it is necessary to supply lubricating oil before and during operation. Patent Document 1 discloses a method and structure for supplying a lubricating oil.

Unexamined-Japanese-Patent No. 2016-165692

  The pump is degraded due to the contamination of the lubricating oil with stone powder or the like. As the pump deteriorates, it becomes unusable and it is necessary to stop the crusher at unintended timing. If it is not ready to replace the pump at that point, the crusher will be shut down for an extended period of time.

  An object of the present invention is to enable maintenance of a crusher at an appropriate timing.

According to the invention
A crushing mechanism having a concave and a mantle,
A lubricating oil supply mechanism including a pump and supplying lubricating oil to the crushing mechanism;
A measuring device for measuring the pressure of the lubricating oil supplied from the lubricating oil supply mechanism;
An arithmetic device for notifying maintenance timing based on a rate of decrease in pressure of the lubricating oil from a reference value;
A crusher is provided.

Moreover, according to the present invention,
A calculation unit for calculating a rate of decrease in pressure of the lubricating oil supplied to a crushing mechanism having a concave and a mantle from a reference value;
A determination unit that determines whether the decrease rate has reached a threshold value;
A notification unit that performs notification of requesting maintenance when the reduction rate reaches a threshold value;
A computing device is provided.

Moreover, according to the present invention,
The computer is
Calculating the rate of decrease in pressure of the lubricating oil supplied to a crushing mechanism having a concave and a mantle from a reference value;
A determination step of determining whether the reduction rate has reached a threshold value;
A notification step of performing notification for requesting maintenance when the reduction rate reaches a threshold value;
A notification method is provided to perform the

Moreover, according to the present invention,
Computer,
Calculation means for calculating a rate of decrease in pressure of the lubricating oil supplied to the crushing mechanism having the concave and the mantle from a reference value;
A determination unit that determines whether the decrease rate has reached a threshold value;
A notification unit for performing a notification for requesting maintenance when the reduction rate reaches a threshold value;
A program to function as is provided.

  According to the present invention, maintenance of the crusher can be performed at an appropriate timing.

It is a figure showing an example of a functional block diagram of a grinder of this embodiment. It is a figure which shows the structural example of the crusher of this embodiment. It is a figure which shows an example of the schematic of the grinding mechanism of this embodiment. It is a figure which shows notionally an example of the hardware constitutions of the arithmetic unit of this embodiment. It is a figure which shows an example of the functional block diagram of the arithmetic unit of this embodiment. It is a figure for demonstrating the process of the arithmetic unit of this embodiment.

First Embodiment
First, an outline of a crusher (corn crusher) of the present embodiment will be described. When the pump for supplying the lubricating oil to the crushing mechanism is deteriorated, the pressure of the lubricating oil supplied by the operation of the pump (pressure of the lubricating oil in the pipeline) decreases. The pressure decreases as the pump deteriorates. Therefore, the crusher of the present embodiment monitors the pressure of the lubricating oil supplied from the lubricating oil supply mechanism to the crushing mechanism, and determines and notifies the maintenance timing based on the rate of decrease of the pressure from the reference value. According to such a crusher of the present embodiment, the maintenance timing of the lubricating oil and the pump can be quantitatively determined using the pressure of the lubricating oil, so that the crusher can be maintained at an appropriate timing.

  Hereinafter, the configuration of the crusher of the present embodiment will be described in detail. FIG. 1 shows an example of a functional block diagram of the crusher 1 of the present embodiment. The structural example of the crusher 1 is shown in FIG. In FIG. 2, a line of lubricating oil is indicated by a solid line, and a communication line is indicated by a dotted line. As illustrated, the crusher 1 includes a crushing mechanism 10, a lubricating oil supply mechanism 20, a measuring device 30, and an arithmetic device 40.

  The crushing mechanism 10 has a concave and a mantle, which cooperate to crush an object to be crushed. An example of the crushing mechanism 10 is shown in FIG. The configuration of the crushing mechanism 10 illustrated is merely an example, and the configuration of the crushing mechanism 10 is not limited to that illustrated.

  Here, the configuration of the crushing mechanism 10 will be briefly described. As illustrated, the crushing mechanism 10 has a tubular body 13 including a hopper 11 and a concave 12, a mantle 14, a main shaft 15, and a drive shaft 16.

  An object to be crushed is supplied to the inside of the cylindrical body 13. For example, an object to be crushed carried by a conveyor (not shown) is supplied into the cylindrical body 13 from the opening at the upper side of the cylindrical body 13 in the drawing. The material to be crushed is, for example, a rock.

  The mantle 14 is located on the lower opening side of the cylindrical body 13. The mantle 14 sandwiches the object to be crushed with the lower surface of the concave 12 to break the object to be crushed. The concave 12 is vertically movably and exchangeably mounted on the upper portion of the apparatus body. The mantle 14 is supported by a drive shaft 16 inclined from the rotation axis, and is rotationally driven in a so-called precession state. Therefore, a crushing chamber for crushing the raw material is formed in the gap between the upper surface of the mantle 14 and the lower surface of the concave 12.

  When a force is applied to the drive shaft 16 by a drive means (for example, an electric motor, a hydraulic motor, etc.) not shown, the drive shaft 16 rotates. The drive shaft 16 and the main shaft 15 mesh with each other via a gear or the like. When the drive shaft 16 rotates, a force is applied to the main shaft 15, and the main shaft 15 rotates. The mantle 14 rotates with the rotation of the main shaft 15. Force is applied to the material to be crushed by the rotation to crush it.

  Returning to FIG. 1, the lubricating oil supply mechanism 20 supplies lubricating oil to the crushing mechanism 10. The lubricating oil supply mechanism 20 includes a pump for delivering the lubricating oil. Examples of the type of pump include a gear pump, a screw pump, a vane pump, and a piston pump.

  The structural example of the lubricating oil supply mechanism 20 is shown in FIG. In addition, the said structural example is an example to the last, and is not limited to this. The lubricating oil supply mechanism 20 shown in FIG. 2 includes a pump 21, a filter 22, a cooler 23, a filter 24, and a storage chamber 25.

  The storage chamber 25 stores lubricating oil. The pump 21 pumps out the lubricating oil stored in the storage chamber 25 and sends it out to the crushing mechanism 10. The lubricating oil delivered from the pump 21 is supplied to the crushing mechanism 10 after passing through the filter 22 and the cooler 23. In addition, after the lubricating oil discharged from the crushing mechanism 10 passes through the filter 24, it is returned to the storage chamber 25.

  Returning to FIG. 1, the measuring device 30 measures the pressure of the lubricating oil supplied from the lubricating oil supply mechanism 20 (pressure of the lubricating oil in the pipeline).

  An example of the installation position of the measuring device 30 is shown in FIG. The measuring device 30 is installed, for example, to measure the pressure of the lubricating oil in the line between the crushing mechanism 10 and the cooler 23. Alternatively, the pressure of lubricating oil in a pipe line between the filter 22 and the cooler 23 and a pipe line between the pump 21 and the filter 22 may be measured.

  The measuring device 30 measures the pressure when the temperature of the lubricating oil reaches a predetermined reference temperature on the day when the crusher 1 is operated. For example, the measuring device 30 may measure the pressure when the temperature of the lubricating oil reaches a predetermined reference temperature for the first time the crusher 1 is operated. As a reference temperature, 40 degreeC and its surrounding temperature are illustrated, for example.

  The position at which the temperature of the lubricating oil is measured is not particularly limited. For example, it may be measured in a pipe line between the crushing mechanism 10 and the filter 24 or in a pipe line between the crushing mechanism 10 and the cooler 23. Between the filter 22 and the pump 21, or between the pump 21 and the storage chamber 25. It may be measured in the pipeline between the storage chamber 24 and the storage chamber 25 or may be measured in the storage chamber 25.

  The measuring device 30 preferably measures the pressure every day when the crusher 1 is operated, but may measure the pressure every predetermined operation day such as every two operation days, every five operation days, every ten operation days.

  Returning to FIG. 1, the computing device 40 notifies maintenance timing based on the rate of decrease of the pressure of the lubricating oil from the reference value. Arithmetic device 40 acquires the measured value of measuring device 30, and executes the process based on the acquired value.

  First, an example of the hardware configuration of the arithmetic device 40 for realizing the processing will be described. The respective units included in the arithmetic device 40 according to the present embodiment include a central processing unit (CPU) of any computer, a memory, and a program loaded to the memory (in addition to a program stored in the memory from the stage of shipping the device in advance) Arbitrary hardware and software centering on a storage medium such as a CD (Compact Disc), a program downloaded from a server on the Internet, etc., a storage unit such as a hard disk storing the program, and an interface for network connection It is realized by the combination. And it is understood by those skilled in the art that there are various modifications in the implementation method and apparatus.

  FIG. 4 is a diagram conceptually showing an example of the hardware configuration of the arithmetic device 40. As shown in FIG. As illustrated, the arithmetic device 40 includes a processor 1A, a memory 2A, an input / output interface 3A, a peripheral circuit 4A, and a bus 5A. Peripheral circuit 4A includes various modules. The peripheral circuit 4A may not be provided.

  The bus 5A is a data transmission path for the processor 1A, the memory 2A, the peripheral circuit 4A, and the input / output interface 3A to mutually transmit and receive data. The processor 1A is an arithmetic processing unit such as a CPU or a graphics processing unit (GPU), for example. The memory 2A is, for example, a memory such as a random access memory (RAM) or a read only memory (ROM). The input / output interface 3A is an interface for acquiring information from an input device (eg, a keyboard, a mouse, a microphone, etc.), an external device, an external server, an external sensor, etc., an output device (eg, a display, a speaker, a printer, a mailer) Etc.), an interface for outputting information to an external device, an external server, etc. The processor 1A can issue an instruction to each module and perform an operation based on the result of the operation.

  Next, the functional configuration of the arithmetic device 40 will be described. FIG. 5 shows an example of a functional block diagram of the arithmetic device 40. As illustrated, the arithmetic device 40 includes a calculation unit 41, a determination unit 42, and a notification unit 43.

  The calculator 41 calculates the rate of decrease of the pressure of the lubricating oil supplied to the crushing mechanism 10 from the reference value. Hereinafter, the rate of decrease of the pressure of the lubricating oil supplied to the crushing mechanism 10 from the reference value may be simply referred to as the “rate of decrease”.

  The reference value may be a predetermined value, and may be a value registered in the calculation unit 41. For example, the operator may register a predetermined value as the reference value in the arithmetic device 40. In addition, the calculation unit 41 may determine the reference value based on the measurement value of the measurement device 30.

  In the case where the calculation unit 41 determines the reference value, for example, the pressure of the lubricating oil initially measured by the measuring device 30 may be used as the reference value. The pressure of the lubricating oil initially measured by the measuring device 30 means the pressure when the temperature of the lubricating oil reaches a predetermined reference temperature on the first day of operation of the crusher 1.

  The method of calculating the rate of decrease is, for example, (rate of decrease [%]) = {(reference value) − (measured pressure)} × 100 / (reference value).

  The determination unit 42 determines whether the reduction rate has reached a threshold. When the reduction rate reaches the threshold, the notification unit 43 notifies the operator of a request for maintenance. Notifications are realized via any output device such as a display, speakers, lamps, buzzers, mailers, printers and the like.

  Note that multiple levels of thresholds may be defined. Then, the determination unit 42 initially determines whether the decrease rate has reached the first level threshold, and after the decrease rate reaches the first level threshold, the decrease rate indicates the second level. It is determined whether or not the reduction rate has reached the second level threshold, and then it is determined whether the reduction rate has reached the third level threshold. May be switched. In this case, the notification unit 43 may switch the notification content according to the threshold level at which the reduction rate has reached.

  For example, as shown in FIG. 6, the threshold value of the reduction rate may be associated with the notification content. In this example, the first level threshold is 10%, the second level threshold is 20%, the third level threshold is 30%, and the fourth level threshold is 40 [ %].

  Then, when the reduction rate reaches the first level threshold, the notification unit 43 requests oil change (lubricant replacement). Also, when the reduction rate reaches the second level threshold, the notification unit 43 requests oil change. Furthermore, when the reduction rate reaches the third level threshold, the notification unit 43 requests an oil change. Then, when the decrease rate reaches the fourth level threshold value, the notification unit 43 requests preparation for pump reserve.

  In addition, the rate of deterioration of the pump can be made slow by oil exchange. However, oil change can not improve the degree of deterioration of the pump. Therefore, for example, even if oil change is performed in response to a notification when the reduction rate reaches the first level threshold (10%), the reduction rate is not improved and remains at 10%. Become. Therefore, the next comparison target threshold is the second level threshold (20%).

  In addition, when the said pressure is measured every day when the measurement apparatus 30 operated the crusher 1, the calculation part 41 calculates the said reduction rate every day which operated the crusher 1, and the determination part 42 makes a reduction rate a threshold value. It is determined whether or not it has reached, and the notification unit 43 can perform notification processing according to the determination result. When the measuring device 30 measures the above-mentioned pressure every predetermined operation day of the crusher 1 (e.g. every 2 operation days), the calculation unit 41 reduces the above-mentioned decrease every predetermined operation day of the crusher 1 (e.g. every 2 operation days) The rate is calculated, the determination unit 42 determines whether the decrease rate has reached a threshold, and the notification unit 43 performs notification processing according to the determination result.

  According to the crusher 1 of the present embodiment described above, the maintenance timing of the lubricating oil or the pump can be quantitatively determined using the pressure of the lubricating oil, so that the crusher can be maintained at an appropriate timing.

  Further, according to the crusher 1 of the present embodiment, the maintenance timing can be determined based on the rate of decrease of the pressure of the lubricating oil from the reference value. Assuming that the reference value is the pressure when the temperature of the lubricating oil reaches a predetermined reference temperature on the day of the first operation of the crusher 1, the crusher from the reference state (the initial state) The degree of deterioration of 1 (specifically, the pump) can be well expressed. Since the maintenance timing of the lubricating oil and the pump can be determined using such a reduction rate, maintenance of the crusher can be performed at an appropriate timing.

  In addition, the measuring device 30 measures the pressure when the temperature of the lubricating oil reaches a predetermined reference temperature on the day when the crusher is operated. For example, the measuring device 30 measures the pressure when the temperature of the lubricating oil reaches a predetermined reference temperature for the first time the crusher is operated. By using the value measured under such conditions, the reliability of notification of maintenance timing can be increased.

Second Embodiment
The crusher 1 of the present embodiment is different from that of the first embodiment in the configurations of the measuring device 30 and the computing device 40. The structures of the crushing mechanism 10 and the lubricating oil supply mechanism 20 are the same as in the first embodiment.

  The measuring device 30 measures the pressure when the temperature of the lubricating oil reaches each of a plurality of predetermined reference temperatures on the day when the crusher 1 is operated. For example, the measuring device 30 may measure the pressure when the temperature of the lubricating oil reaches each of a plurality of predetermined reference temperatures for the first time when the crusher 1 is operated. As a plurality of reference temperatures, for example, 30 ° C., 40 ° C., 50 ° C., etc., and the ambient temperature thereof are exemplified. The other configuration of the measuring device 30 is the same as that of the first embodiment.

  Arithmetic unit 40 notifies maintenance timing based on the pressure when the temperature of the lubricating oil reaches any one of a plurality of predetermined reference temperatures on the day when crusher 1 is operated. That is, the calculation unit 41 calculates the rate of decrease from the reference value of pressure when one of the plurality of reference temperatures is reached, and the determination unit 42 determines whether the rate of decrease reaches the threshold value or not. The notification unit 43 performs notification processing according to the determination result.

  The reference value is determined for each of a plurality of reference temperatures. The reference value may be predetermined and may be a value registered in the calculation unit 41. For example, the operator may determine the reference value for each reference temperature and register it in the arithmetic device 40. In addition, the calculation unit 41 may determine the reference value for each reference temperature based on the measurement result by the measurement device 30.

  In the case where the calculation unit 41 determines the reference value, for example, the pressure of the lubricating oil at each reference temperature initially measured by the measuring device 30 may be used as the reference value. When the temperature of the lubricating oil reaches a predetermined reference temperature on the first operation day of the crusher 1, the pressure measured at that time is used as the reference value of the reference temperature. If there is a reference temperature at which the temperature of the lubricating oil did not reach on the first operation day, the pressure measured when the temperature of the lubricating oil first reached on the subsequent operation days is taken as the reference value of the reference temperature.

  Here, processing for determining one to be used for notification of maintenance timing from among a plurality of reference temperatures will be described.

  For example, a plurality of reference temperatures may be prioritized in advance. Then, the arithmetic unit 40 performs maintenance timing based on the pressure when the temperature of the lubricating oil reaches the highest reference temperature among the reference temperatures reached by the temperature of the lubricating oil on the day when the crusher 1 is operated. It may be notified.

  The other configuration of the arithmetic device 40 is the same as that of the first embodiment.

  According to the crusher 1 of the present embodiment described above, the same effects as those of the first embodiment can be realized. Moreover, according to the crusher 1 of the present embodiment, it is possible to measure the pressure when each of the plurality of reference temperatures is reached, and to determine the maintenance timing using any of them. The ultimate temperature of the lubricating oil may differ depending on the season, weather, installation environment, etc. If the reference temperature is set to only one, days may occur where the temperature of the lubricating oil does not reach that reference temperature. In such a case, the pressure of the lubricating oil of that day is not measured, so it can not be determined whether maintenance is necessary. If such a day occurs, and if such days occur continuously, there may be a disadvantage that detection of maintenance timing or notification is delayed.

  When a plurality of reference temperatures are determined as in the present embodiment, the occurrence of the above-mentioned inconvenience can be suppressed. In addition, by prioritizing a plurality of reference temperatures, it is possible to make a determination at a preferable reference temperature preferentially.

Third Embodiment
The crusher 1 of the present embodiment differs from the first and second embodiments in the configuration of the arithmetic device 40. The configurations of the crushing mechanism 10, the lubricating oil supply mechanism 20, and the measuring device 30 are the same as in the first and second embodiments.

  The determination unit 42 of the arithmetic device 40 predicts the timing at which the reduction rate reaches the threshold based on the time change of the reduction rate. Then, the notification unit 43 notifies the timing predicted by the determination unit 42 as a maintenance timing.

  Based on the reduction rates for the plurality of operation days calculated by the calculation unit 41, it is possible to grasp the time change of the reduction rates over a plurality of days. For example, an approximate curve that well represents the time change of the rate of decrease may be determined, and an expression indicating the approximate curve may be used to predict the timing (day) when the rate of decrease reaches the threshold.

  In addition, when the threshold value of multiple levels is defined, the determination unit 42 may predict the timing at which the decrease rate reaches each of the threshold values of multiple levels.

  The other configuration of the arithmetic device 40 is the same as that of the first and second embodiments.

  According to the crusher 1 of the present embodiment described above, the same effects as those of the first and second embodiments can be realized. Moreover, according to the present embodiment, before the decrease rate reaches the threshold value, it is possible to notify the operator of the prediction result of the timing. By preparing for maintenance based on the prediction result, the operator can reliably perform maintenance when the reduction rate reaches the threshold.

Hereinafter, an example of a reference form is added.
1. A crushing mechanism having a concave and a mantle,
A lubricating oil supply mechanism including a pump and supplying lubricating oil to the crushing mechanism;
A measuring device for measuring the pressure of the lubricating oil supplied from the lubricating oil supply mechanism;
An arithmetic device for notifying maintenance timing based on a rate of decrease in pressure of the lubricating oil from a reference value;
Crusher with.
2. In the crusher described in 1,
The crusher which notifies that the arithmetic unit requests maintenance when the reduction rate reaches a threshold.
3. In the crusher according to 1 or 2,
The measuring device measures the pressure when the temperature of the lubricating oil reaches a predetermined reference temperature on the day when the crusher is operated.
4. In the crusher described in 3,
The measuring device measures the pressure when the temperature of the lubricating oil reaches each of a plurality of predetermined reference temperatures on the day when the crusher is operated.
5. In the crusher described in 4,
The crusher notifies the maintenance timing based on the pressure when the temperature of the lubricating oil reaches any of a plurality of predetermined reference temperatures on the day when the crusher is operated.
6. In the crusher described in 5,
Priorities are set in advance for multiple reference temperatures,
The arithmetic unit is configured to notify maintenance timing based on the pressure when the temperature of the lubricating oil reaches a reference temperature having the highest priority among the reference temperatures reached by the temperature of the lubricating oil on the day when the crusher is operated. Machine.
7. In the crusher according to any one of 1 to 6,
The crusher predicts the timing at which the decrease rate reaches a threshold based on the time change of the decrease rate, and notifies the predicted timing as maintenance timing.
8. A calculation unit for calculating a rate of decrease in pressure of the lubricating oil supplied to a crushing mechanism having a concave and a mantle from a reference value;
A determination unit that determines whether the decrease rate has reached a threshold value;
A notification unit that performs notification of requesting maintenance when the reduction rate reaches a threshold value;
A computing device having
9. The computer is
Calculating the rate of decrease in pressure of the lubricating oil supplied to a crushing mechanism having a concave and a mantle from a reference value;
A determination step of determining whether the reduction rate has reached a threshold value;
A notification step of performing notification for requesting maintenance when the reduction rate reaches a threshold value;
Notification method to carry out.
10. Computer,
Calculation means for calculating a rate of decrease in pressure of the lubricating oil supplied to the crushing mechanism having the concave and the mantle from a reference value;
A determination unit that determines whether the decrease rate has reached a threshold value;
A notification unit for performing a notification for requesting maintenance when the reduction rate reaches a threshold value;
A program to function as

1A processor 2A memory 3A input / output I / F
4A Peripheral Circuit 5A Bus 1 Crusher 10 Crushing Mechanism 11 Hopper 12 Concave 13 Tubular Body 14 Mantle (Crushing Means)
Reference Signs List 15 spindle 16 drive shaft 20 lubricating oil supply mechanism 21 pump 22 filter 23 cooler 24 filter 25 storage chamber 30 measuring device 40 computing device 41 calculating unit 42 determining unit 43 notification unit

Claims (10)

A crushing mechanism having a concave and a mantle,
A lubricating oil supply mechanism including a pump and supplying lubricating oil to the crushing mechanism;
A measuring device for measuring the pressure of the lubricating oil supplied from the lubricating oil supply mechanism;
An arithmetic device for notifying maintenance timing based on a rate of decrease in pressure of the lubricating oil from a reference value;
Crusher with. In the crusher according to claim 1,
The crusher which notifies that the arithmetic unit requests maintenance when the reduction rate reaches a threshold. In the crusher according to claim 1 or 2,
The measuring device measures the pressure when the temperature of the lubricating oil reaches a predetermined reference temperature on the day when the crusher is operated. In the crusher according to claim 3,
The measuring device measures the pressure when the temperature of the lubricating oil reaches each of a plurality of predetermined reference temperatures on the day when the crusher is operated. In the crusher according to claim 4,
The crusher notifies the maintenance timing based on the pressure when the temperature of the lubricating oil reaches any of a plurality of predetermined reference temperatures on the day when the crusher is operated. In the crusher according to claim 5,
Priorities are set in advance for multiple reference temperatures,
The arithmetic unit is configured to notify maintenance timing based on the pressure when the temperature of the lubricating oil reaches a reference temperature having the highest priority among the reference temperatures reached by the temperature of the lubricating oil on the day when the crusher is operated. Machine. The crusher according to any one of claims 1 to 6.
The crusher predicts the timing at which the decrease rate reaches a threshold based on the time change of the decrease rate, and notifies the predicted timing as maintenance timing. A calculation unit for calculating a rate of decrease in pressure of the lubricating oil supplied to a crushing mechanism having a concave and a mantle from a reference value;
A determination unit that determines whether the decrease rate has reached a threshold value;
A notification unit that performs notification of requesting maintenance when the reduction rate reaches a threshold value;
A computing device having The computer is
Calculating the rate of decrease in pressure of the lubricating oil supplied to a crushing mechanism having a concave and a mantle from a reference value;
A determination step of determining whether the reduction rate has reached a threshold value;
A notification step of performing notification for requesting maintenance when the reduction rate reaches a threshold value;
Notification method to carry out. Computer,
Calculation means for calculating a rate of decrease in pressure of the lubricating oil supplied to the crushing mechanism having the concave and the mantle from a reference value;
A determination unit that determines whether the decrease rate has reached a threshold value;
A notification unit for performing a notification for requesting maintenance when the reduction rate reaches a threshold value;
A program to function as

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