KR102242630B1 - Maintenance planning system and maintenance planning method - Google Patents

Abstract

The management terminal 300 displays an adjustment screen including a risk graph indicating a time series of risk values, an allowable mark indicating an allowable value, a deadline mark indicating a deadline for the risk value to reach the allowable value, and a change interface for changing the allowable value. do. The management terminal accepts the designated allowable value specified by the change interface. The maintenance planning device 200 calculates a new due date based on the designated allowable value and the risk value time series, and determines a maintenance work date based on the new due date.

Description

Maintenance planning system and maintenance planning method

The present invention relates to a system for making a maintenance plan for a mechanical product involving remote monitoring.

In risk-based maintenance (RBM), the risk when an abnormality occurs and the probability of occurrence are calculated for each part of the facility, such as a plant, and an optimal maintenance plan is calculated based on the risk calculated by the multiplication. Be prepared.

In patent document 1, in risk-based maintenance, a method of predicting the timing of damage to the device or deterioration of the device's performance, treating the predicted result as a cost, and determining an appropriate maintenance timing is proposed.

In some mechanical equipment such as elevators, remote monitoring is performed to detect an abnormality based on information such as sensors in the aircraft.

Patent Document 2 proposes a technique for calculating the occurrence time of an abnormality based on the amount of change in the Mahalanobis distance by collecting information collected from various sensors in remote monitoring.

Patent Document 1: Japanese Patent Laid-Open No. 2003-303243 Patent Document 2: Japanese Patent Laid-Open No. 2013-113775

In providing maintenance services to the owner of the device, the downtime criterion applies. Specifically, the downtime criterion may be applied to a case of providing a maintenance service for a device in which operation is less likely to stop even if sufficient maintenance quality is not secured, such as an elevator.

However, since the downtime criterion did not adequately reflect the request of the owner, it was difficult to streamline the maintenance plan while maintaining customer satisfaction.

An object of the present invention is to make it possible to make a maintenance plan according to the permissible risk designated by the manager (including the owner).

The maintenance planning system of the present invention,

A display unit for displaying an adjustment screen including a risk graph representing a time series of risk values, a tolerance mark representing a tolerance, a deadline mark representing a deadline for the risk value to reach the tolerance, and a change interface for changing the tolerance;

A reception unit that accepts a designated allowable value specified by the change interface;

An adjustment unit that calculates a new deadline date based on the designated tolerance and the risk value time series,

And a planning unit that determines a repair work day based on the new deadline.

According to the present invention, a maintenance plan can be made according to the permissible risk specified by the manager (including the owner).

1 is a configuration diagram of a maintenance planning system 100 according to a first embodiment.
2 is a configuration diagram of a maintenance planning device 200 according to the first embodiment.
3 is a configuration diagram of a management terminal 300 according to the first embodiment.
4 is an explanatory diagram of maintenance plan data 120 in the first embodiment.
5 is a flowchart of the maintenance planning method according to the first embodiment.
6 is a diagram illustrating an adjustment screen 130 in the first embodiment.
7 is a diagram showing movement of the adjustment screen 130 in the first embodiment.
8 is an explanatory diagram of a maintenance work day in Embodiment 1. FIG.
9 is an explanatory diagram of a maintenance work day in the first embodiment.
10 is an explanatory diagram of a maintenance work day in the first embodiment.
11 is a configuration diagram of a maintenance planning device 200 according to the second embodiment.
12 is a flowchart of the maintenance planning method according to the second embodiment.
13 is a flowchart of the maintenance planning method according to the second embodiment.
14 is a diagram illustrating a restriction screen 140 in the second embodiment.
15 is an explanatory diagram of a maintenance work day in the second embodiment.
16 is an explanatory diagram of a maintenance work day in the second embodiment.
17 is a configuration diagram of a maintenance planning device 200 according to the third embodiment.
18 is a configuration diagram of a maintenance planning device 200 according to the fourth embodiment.
19 is a flowchart of an event response method according to the fourth embodiment.
20 is a hardware configuration diagram of the maintenance planning device 200 according to the embodiment.
21 is a hardware configuration diagram of the management terminal 300 in the embodiment.

In the embodiment and the drawings, the same elements and corresponding elements are denoted with the same reference numerals. Descriptions of elements denoted by the same reference numerals are appropriately omitted or simplified. Arrows in the drawing mainly indicate the flow of data or processing.

Embodiment 1.

The maintenance planning system 100 will be described based on FIGS. 1 to 10.

***Composition description***

The configuration of the maintenance planning system 100 will be described based on FIG. 1.

The maintenance plan system 100 is a system for setting up a maintenance plan for the monitored object 110.

The maintenance planning system 100 includes a monitoring target 110, a maintenance planning device 200, and a management terminal 300.

The monitoring target 110, the maintenance planning apparatus 200, and the management terminal 300 communicate with each other through the network 101.

The monitoring target 110 is a device that is monitored remotely, and includes various sensors 111. For example, the monitored object 110 is an elevator or an escalator.

The maintenance planning device 200 drafts a maintenance plan for the monitored object 110.

The management terminal 300 is used to manage a maintenance plan.

The configuration of the maintenance planning device 200 will be described based on FIG. 2.

The maintenance planning device 200 is a computer having hardware such as a processor 201, a memory 202, an auxiliary storage device 203, and a communication device 204. These hardware are connected to each other through signal lines.

The processor 201 is an IC (Integrated Circuit) that performs arithmetic processing, and controls other hardware. For example, the processor 201 is a central processing unit (CPU), a digital signal processor (DSP), or a graphics processing unit (GPU).

The memory 202 is a volatile memory device. The memory 202 is also called a main memory device or a main memory. For example, the memory 202 is a random access memory (RAM). The data stored in the memory 202 is stored in the auxiliary storage device 203 as necessary.

The auxiliary memory device 203 is a nonvolatile memory device. For example, the auxiliary storage device 203 is a ROM (Read Only Memory), an HDD (Hard Disk Drive), or a flash memory. Data stored in the auxiliary storage device 203 is loaded into the memory 202 as necessary.

Communication device 204 is a receiver and transmitter. For example, the communication device 204 is a communication chip or a network interface card (NIC).

The maintenance planning device 200 includes elements such as a screen portion 211, an adjustment portion 212, and a planning portion 213. These elements are realized in software.

In the auxiliary storage device 203, a maintenance plan program for causing a computer to function as the screen unit 211, the adjustment unit 212, the planning unit 213, the storage unit 291, and the communication unit 292 are stored. The maintenance plan program is loaded into the memory 202 and executed by the processor 201.

In addition, an OS (Operating System) is stored in the auxiliary storage device 203. At least part of the OS is loaded into the memory 202 and executed by the processor 201.

In other words, the processor 201 executes the maintenance plan program while executing the OS.

Data obtained by executing the maintenance plan program is stored in a memory device called a memory 202, an auxiliary storage device 203, a register in the processor 201, or a cache memory in the processor 201.

The memory 202 functions as a storage unit 291. However, another storage device may function as the storage unit 291 instead of the memory 202 or together with the memory 202.

The communication device 204 functions as a communication unit 292.

The maintenance planning device 200 may include a plurality of processors replacing the processor 201. The plurality of processors share the roles of the processor 201.

The maintenance plan program can be recorded (stored) readable by a computer on a nonvolatile recording medium such as an optical disk or flash memory.

The configuration of the management terminal 300 will be described based on FIG. 3.

The management terminal 300 is a computer having hardware such as a processor 301, a memory 302, an auxiliary storage device 303, a communication device 304, and an input/output interface 305. These hardware are connected to each other through signal lines.

The processor 301 is an IC that performs arithmetic processing and controls other hardware. For example, the processor 301 is a CPU, DSP, or GPU.

The memory 302 is a volatile memory device. The memory 302 is also called a main memory device or a main memory. For example, the memory 302 is a RAM. The data stored in the memory 302 is stored in the auxiliary storage device 303 as necessary.

The auxiliary memory device 303 is a nonvolatile memory device. For example, the auxiliary storage device 303 is a ROM, HDD, or flash memory. Data stored in the auxiliary storage device 303 is loaded into the memory 302 as necessary.

The communication device 304 is a receiver and a transmitter. For example, the communication device 304 is a communication chip or NIC.

The input/output interface 305 is a port to which an input device and an output device are connected. For example, the input/output interface 305 is a USB terminal, an input device is a keyboard and a mouse, and an output device is a display. USB is an abbreviation for Universal Serial Bus.

The management terminal 300 includes a control unit 311 that controls a storage unit 391, a communication unit 392, a display unit 393, and a reception unit 394. The control unit 311 is implemented in software.

In the auxiliary storage device 303, a management program for causing the computer to function as the control unit 311, the storage unit 391, the communication unit 392, the display unit 393, and the reception unit 394 are stored. The management program is loaded into the memory 302 and executed by the processor 301.

In addition, an OS is stored in the auxiliary storage device 303. At least part of the OS is loaded into the memory 302 and executed by the processor 301.

In other words, the processor 301 executes the management program while executing the OS.

Data obtained by executing the management program is stored in a memory device called a memory 302, an auxiliary storage device 303, a register in the processor 301, or a cache memory in the processor 301.

The memory 302 functions as a storage unit 391. However, another storage device may function as the storage unit 391 instead of the memory 302 or together with the memory 302.

The communication device 304 functions as a communication unit 392.

The input/output interface 305 functions as a display unit 393 and a reception unit 394.

The management terminal 300 may be provided with a plurality of processors that replace the processor 301. The plurality of processors share the role of the processor 301.

The management program can be recorded (stored) readable by a computer on a nonvolatile recording medium such as an optical disk or flash memory.

Based on FIG. 4, the maintenance plan data 120 is demonstrated.

The maintenance plan data 120 represents a maintenance plan for the monitored object 110.

Specifically, the maintenance plan data 120 represents a visit schedule and a maintenance work schedule.

The visit schedule is the schedule of the visit date.

The visit date is the day the worker visits the target facility.

The target facility is a facility having the monitored object 110.

The broken-line triangle represents the regular visit.

The maintenance work schedule is a schedule of maintenance work days.

The maintenance work day is a day when a worker performs maintenance work on the monitored object 110.

The solid triangle represents the maintenance work day.

The maintenance work day is determined based on the time series of risk values of the monitored object 110.

Specifically, the visit date before the day when the risk value (total) reaches the allowable value is determined as the maintenance work day.

The permissible value is a value determined as the maximum permissible risk value.

The risk value (total) is the sum of individual risk values. For example, the risk value (total) is the sum of the risk value A and the risk value B.

The risk value A is the risk value of the failure risk A.

The risk value B is the risk value of the failure risk B.

The risk value is a value indicating the degree of failure risk. The larger the risk value, the higher the risk of failure. The risk of failure increases over time.

Each risk value time series and initial maintenance plan data 120 are obtained by a conventional method in risk-based maintenance (RBM).

For example, the time series of each risk value and initial maintenance plan data 120 are obtained by the method disclosed in Patent Document 1.

***A description of the operation***

The operation of the maintenance planning system 100 (especially the operation of the maintenance planning device 200) corresponds to the maintenance planning method. In addition, the procedure of the maintenance planning method corresponds to the procedure of the maintenance planning program.

Based on Fig. 5, the maintenance planning method will be described.

In the description of the remuneration planning method, the risk value means the risk value (total).

The initial maintenance plan data 120 is stored in the storage unit 291 of the maintenance planning device 200. In addition, the risk value time series and the initial allowable value are stored in the storage unit 291 of the maintenance planning device 200.

In step S110, the display unit 393 displays the adjustment screen 130 on the display.

Based on FIG. 6, the adjustment screen 130 will be described.

The adjustment screen 130 has a risk graph 131, an allowable mark 132, a deadline mark 133, and a change interface 134.

The risk graph 131 represents a time series of risk values of the monitored object 110.

Specifically, the risk graph 131 is a line graph showing a time series of risk values. The vertical axis represents the risk value, and the horizontal axis represents the time.

The solid line portion of the risk graph 131 represents a time series of performance values. The performance value is the past risk value.

The broken line portion of the risk graph 131 represents the predicted value time series. The predicted value is a risk value in the future.

The allowable mark 132 represents an allowable value. Specifically, the allowable mark 132 is a straight line.

The deadline mark 133 indicates a deadline. The due date is the day when the risk value reaches an acceptable value. In other words, the deadline is the day corresponding to the risk value equal to the allowable value. Specifically, the deadline mark 133 is an arrow indicating a deadline date.

The change interface 134 is an interface for changing an allowable value.

Specifically, the change interface 134 is an up button and a down button. The up button is pressed to raise the tolerance, and the down button is pressed to lower the tolerance.

Returning to Fig. 5, the procedure of step S110 will be described.

First, the screen unit 211 generates data of the adjustment screen 130.

Next, the communication unit 292 transmits the data of the adjustment screen 130 to the management terminal 300.

Next, the communication unit 392 receives the data of the adjustment screen 130 from the maintenance planning device 200.

Then, the display unit 393 uses the data of the adjustment screen 130 to display the adjustment screen 130 on the display.

A procedure for generating data on the adjustment screen 130 will be described.

First, the screen unit 211 calculates an initial deadline date based on the risk value time series and the initial allowable value. The initial due date is the day corresponding to the risk value equal to the initial allowable value.

Next, the screen unit 211 generates the risk graph 131 based on the risk value time series, generates the allowable mark 132 based on the initial allowable value, and the deadline mark 133 based on the initial due date. Create

Then, the screen unit 211 generates data of the adjustment screen 130.

In step S120, the acceptance unit 394 accepts the designated allowable value.

The designated tolerance value is a tolerance value designated by the change interface 134 of the adjustment screen 130.

The procedure of step S120 will be described.

First, the manager designates an allowable value using the change interface 134 by operating the input device of the management terminal 300. Specifically, the manager presses the up button or the down button by operating the mouse.

Then, the reception unit 394 accepts the designated allowable value.

In step S130, the adjustment unit 212 calculates a new deadline.

The new deadline is the deadline corresponding to the specified tolerance.

The procedure of step S130 will be described.

First, the communication unit 392 transmits the designated allowable value to the maintenance planning device 200.

Next, the communication unit 292 receives the designated allowable value from the management terminal 300. Further, the storage unit 291 updates the stored allowable value to the designated allowable value.

Then, the adjustment unit 212 calculates a new deadline date based on the risk value time series and the designated allowable value. The new deadline is the day when the risk value reaches the specified tolerance. In other words, the new deadline is the day corresponding to the risk value equal to the specified tolerance. Further, the storage unit 291 updates the memorized deadline date with a new deadline date.

In step S140, the screen unit 211 updates the adjustment screen 130.

Specifically, the screen unit 211 moves the allowable mark 132 of the adjustment screen 130 based on the designated allowable value, and moves the deadline mark 133 of the adjustment screen 130 based on the new deadline. do.

Based on FIG. 7, the movement of the adjustment screen 130 will be described.

When the up button, which is the change interface 134, is pressed, the permission mark 132 moves upward, and the deadline mark 133 moves to the right.

Further, when the down button, which is the change interface 134, is pressed, the permission mark 132 moves downward, and the deadline mark 133 moves to the left.

Returning to Fig. 5, the procedure of step S140 will be described.

First, the screen unit 211 generates a risk graph 131 based on a risk value time series, generates an allowance mark 132 based on a designated allowable value, and creates a deadline mark 133 based on the new deadline. Generate.

Next, the screen unit 211 generates data after the adjustment screen 130 has been updated.

Next, the communication unit 292 transmits the updated data of the adjustment screen 130 to the management terminal 300.

Next, the communication unit 392 receives the updated data of the adjustment screen 130 from the maintenance planning device 200.

Then, the display unit 393 displays the adjustment screen 130 on the display by using the updated data of the adjustment screen 130.

In step S150, the planning unit 213 determines the maintenance work day based on the new deadline date.

Then, the planning unit 213 registers the maintenance work day in the maintenance plan data 120.

The procedure of step S150 will be described.

First, the planning unit 213 selects the next visit date from the maintenance plan data 120.

Next, the planning unit 213 compares the next visit date with the new due date.

When the next visit date is a day before the new due date, the planning unit 213 determines the visit date before the new due date as the maintenance work day. Specifically, the planning unit 213 selects the visit date immediately before the new due date from the maintenance plan data 120. The selected visit date becomes the maintenance work day. Then, the planning unit 213 registers the maintenance work day in the maintenance plan data 120.

When the next visit date is a day after the new due date, the planning unit 213 determines an additional visit date before the new due date as the maintenance work day. Specifically, the planning unit 213 selects any one day until the new deadline date. The selected day becomes an additional visit date and maintenance work day. Then, the planning unit 213 registers the additional visit date in the maintenance plan data 120. Further, the planning unit 213 registers the maintenance work day in the maintenance plan data 120.

Determination of the maintenance work day will be described based on FIGS. 8 to 10.

Currently, it is a day after the second visit and a day before the third visit. In other words, the next visit is the third visit.

In Figs. 8 to 10, three allowable values are shown. The first allowable value is the maximum allowable value, the second allowable value is the intermediate allowable value, and the third allowable value is the minimum allowable value.

In Fig. 8, it is assumed that the administrator has designated the first allowable value.

In this case, the next visit date (the third visit date) is the day before the due date, and the visit date immediately before the due date is the fourth visit date. Accordingly, the planning unit 213 determines the fourth visit date as the maintenance work day.

In Fig. 9, it is assumed that the administrator has designated the second allowable value.

In this case, the next visit date (the third visit date) is the day before the due date, and the visit date immediately before the due date is the third visit date. Accordingly, the planning unit 213 determines the third visit date as the maintenance work day.

In Fig. 10, it is assumed that the administrator has designated the third allowable value.

In this case, the next visit date (the third visit date) is a day after the due date. Accordingly, the planning unit 213 selects a day before the next visit date as an additional visit date, and determines the additional visit date as a maintenance work day.

***Supplementary to Embodiment 1***

A specific example of the monitored object 110 is a machine facility.

Mechanical equipment is composed of various parts, and the deterioration of each part progresses depending on the number of uses or aging. Therefore, maintenance work (inspection, adjustment, parts replacement, etc.) is regularly performed so that abnormalities such as service stoppage do not occur.

A specific example of mechanical equipment is an elevator.

Remote monitoring of elevators is being conducted. In remote monitoring, sensor information obtained by the sensor 111 in the gas is collected in the center. When an abnormality is detected by remote monitoring, a maintenance worker dispatches to the site to perform repairs.

A specific example of a facility having the monitored object 110 or the monitored object 110 is a plant.

In order to devise a reasonable maintenance plan for the plant, the risk is calculated by multiplying the effect of each of the above items and the frequency of occurrence. Then, risk-based maintenance (RBM) is performed. In RBM, the maintenance cycle and the contents of the maintenance are determined according to the risk. The influence degree shows the influence when an abnormality occurs. Specifically, the degree of influence is obtained based on the impact on human life, financial loss, or time required for coping. The frequency of occurrence indicates the possibility of occurrence of an abnormality. In a general RBM, the frequency of occurrence is obtained based on the failure occurrence record of the model or the designer's knowledge.

Further, with advances in analysis technology and simulation technology, technologies for predicting deterioration of members due to use have been proposed. Even if simulation is difficult, it is often possible to predict the number of times of use or time of use at which an abnormality occurs by carrying out an endurance test.

Here, the frequency of occurrence of a failure increases with deterioration of the component causing the failure. Therefore, using the estimation result obtained by the deterioration prediction technique, it is possible to estimate the frequency of occurrence of each failure at a specific timing.

In addition, since the condition of the parts is improved when the maintenance work is performed, the frequency of occurrence of abnormalities in the parts on which the maintenance work has been performed decreases.

The degree of influence of each abnormality does not change even if the deterioration situation changes. Therefore, if the frequency of occurrence and the degree of influence are multiplied, the risk at a specific timing can be calculated.

Here, by setting the degree of influence of the failure leading to the user's injury to a value that is significantly higher than that of the normal failure, the deterioration of the important parts is reflected in the risk more greatly.

The maintenance planning system 100 makes it possible for a manager (including the owner of the monitored object 110) to easily change an allowable value, which is a criterion for carrying out maintenance work. The risk value of the monitored object 110 is calculated using the RBM.

First, upon installation of the monitoring object 110, an initial allowable value (an initial value of the allowable level) is determined. Then, the deterioration prediction is performed using the results of the accelerated test or past failure performance data, the risk value time series is calculated based on the prediction result, and the initial maintenance plan data 120 is generated based on the risk value time series. do.

When a worker visits the site at regular intervals, maintenance work is performed at the regular visit just before the risk value exceeds the allowable value. In addition, a regular maintenance plan (initial maintenance plan) is established so that the risk value does not exceed the allowable value and the amount of work is minimized. At this time, conditions such as the personnel plan at the base for performing the maintenance work and the dependence of a plurality of tasks are taken into account.

After the operation of the monitoring object 110 is started, remote monitoring is performed using the sensor 111 provided in the monitoring object 110. Then, the deterioration condition of each component of the monitored object 110 is grasped.

Here, data obtained from deterioration estimation and observed data exist, but measurement deviations exist in the observed data. Therefore, by combining these two types of data using a method similar to the Kalman filter, it is possible to perform deterioration estimation with higher accuracy. For a site where remote monitoring is not performed, condition estimation may be performed using the inspection result at the time of the visit.

If the difference between the deterioration condition of all parts and the deterioration condition predicted at the time of installation is within a certain range, modification of the maintenance plan is unnecessary. Therefore, operation continues as it is.

On the other hand, if the difference exceeds a certain range, the repair plan will be revised.

As a correction of the first step, the timing and content of the regular maintenance is adjusted.

If the deterioration of the condition is earlier than predicted, the maintenance plan is changed to cope with the regular visit before the first time. In addition, when the risk value exceeds the allowable value immediately before the maintenance implementation date due to deterioration, the schedule of the maintenance work may be adjusted in units of several days.

If the deterioration of the condition is slower than predicted, the maintenance plan may be changed to cope with the regular visit after one visit.

In addition, by optimizing the maintenance plan based on the same constraints as in the creation of the initial maintenance plan, it is also possible to determine the contents of the final periodic maintenance.

If the increase in the risk value cannot be included within the acceptable range due to the correction in the first step, the repair plan is changed so that irregular repairs are carried out. In particular, if there is not enough time until the risk value reaches the tolerance, the maintenance plan is changed so that an emergency call is carried out. In the emergency dispatch, the worker rushes to the site to perform repair work on the target site. On the other hand, if there is a margin of time, it is also possible to optimize the overall maintenance plan of the target aircraft on the premise of conducting a visit for the implementation of irregular maintenance before the implementation of the irregular maintenance. Thereby, it is possible to perform repair work on the target site as well as repair work on other sites.

In addition, when the contents of the work at the time of the next visit are adjusted, the maintenance plan data 120 is updated, and the state change is continuously monitored based on the data after the update. By modifying the repair plan at the point when it is found that the risk cannot be coped with by this repair plan, it is always possible to determine an optimal coping policy based on the repair plan system 100.

In addition, while operating this system, the accuracy of deterioration prediction improves. Therefore, the initial repair plan itself may be reviewed at a long period of time so that the effect of this improvement is reflected in the initial repair plan.

It is desirable to set the risk tolerance according to the manager's request.

In luxury hotels, for example, it is required to keep noise and vibration at extremely low levels. In addition, in medical institutions, extremely short downtime is required.

In such a case, by setting the allowable value lower than usual, it is possible to devise an optimal maintenance plan reflecting the request. However, even when the allowable value is adjusted in this way, there cannot be a case where the adjustment to a level at which a failure affecting the user's human body occurs is allowed.

The risk value is utilized not only when the maintenance service company prepares a maintenance plan, but also effectively utilized by being initiated to the manager in real time.

The maintenance planning system 100 includes a management terminal 300. The management terminal 300 may be provided in a center facility in which the maintenance planning system 100 is operated, or may be installed in a remote location connected by the network 101.

The manager can use the management terminal 300 to confirm that the maintenance service company is properly performing maintenance work while managing the risk of the aircraft. In addition, the manager can change the tolerance on the spot based on the result of reviewing the appropriate tolerance.

If the manager changes the tolerance, the remuneration plan is recalculated using the estimate of the current risk value. When the risk value already exceeds the new allowable value, or when it is predicted that the risk value will exceed the new allowable value until the next regular visit, the repair planning system 100 plans irregular repairs. Thereby, it becomes possible to respond quickly to the request of the manager.

***Effect of Embodiment 1***

Since the maintenance planning system 100 provides the manager with the adjustment screen 130, the manager can appropriately adjust the allowable value. As a result, the maintenance service desired by the manager is provided. Therefore, it is possible to improve customer satisfaction.

***Other configurations***

The maintenance planning system 100 (for example, the maintenance planning device 200) may be provided with a generator that generates initial maintenance plan data 120. This generation unit predicts a future risk value time series based on the past risk value time series, and generates the maintenance plan data 120 based on the future risk value time series. For the prediction of the risk value and generation of the maintenance plan data 120, a method in the conventional risk-based maintenance can be used.

Embodiment 2.

In the case where the next visit date is a day later than the new due date, instead of adding a visit date, the operation of the monitored object 110 is restricted, and the differences from the first embodiment are mainly explained based on FIGS. 11 to 16 do.

***Composition description***

The configuration of the maintenance planning system 100 is the same as the configuration in the first embodiment (refer to Fig. 1).

The configuration of the maintenance planning device 200 will be described based on FIG. 11.

The maintenance planning device 200 also includes a limiting unit 214 and a predicting unit 215.

The maintenance plan program also causes the computer to function as the limiting unit 214 and the predicting unit 215.

***A description of the operation***

12 and 13, the maintenance planning method will be described.

In step S201 (refer to FIG. 12), the display unit 393 displays the restriction screen 140 on the display.

14, the restriction screen 140 will be described.

The restriction screen 140 has a restriction interface 141.

The restriction interface 141 is an interface for designating an operation restriction for the monitoring object 110. The restriction interface 141 includes an interface for designating a recommended operation restriction.

Specifically, the restriction interface 141 has a check box for each type of operation restriction.

Returning to Fig. 12, the procedure of step S201 will be described.

First, the screen unit 211 generates data of the limited screen 140.

Next, the communication unit 292 transmits the data of the restriction screen 140 to the management terminal 300.

Next, the communication unit 392 receives the data of the restriction screen 140 from the maintenance planning device 200.

Then, the display unit 393 displays the restriction screen 140 on the display by using the data of the restriction screen 140.

In step S202, the acceptance unit 394 accepts the designation operation restriction.

The designated operation restriction is an operation restriction designated by the restriction interface 141 of the restriction screen 140.

The procedure of step S202 will be described.

First, the manager designates an operation restriction using the restriction interface 141 by operating the input device of the management terminal 300. Specifically, the administrator checks the check box of any one of the motion restrictions by operating the mouse.

Then, the accepting unit 394 accepts the specified operation restriction.

Further, the communication unit 392 transmits a notification of the specified operation restriction to the maintenance planning device 200.

Next, the communication unit 292 receives a notification of the specified operation restriction from the management terminal 300.

Then, the storage unit 291 stores the designated operation restriction.

In step S211, the display unit 393 displays the adjustment screen 130 on the display.

Step S211 is the same as step S110 (refer to Fig. 5) in the first embodiment.

In step S212, the acceptance unit 394 accepts the designated allowable value.

Step S212 is the same as step S120 (refer to FIG. 5) in the first embodiment.

In step S213, the adjustment unit 212 calculates a new deadline.

Step S213 is the same as step S130 (refer to FIG. 5) in the first embodiment.

In step S220, the limiting unit 214 selects the next visit date from the maintenance plan data 120.

Then, the limiting unit 214 compares the next visit date with the new due date.

If the next visit date is a day before the new deadline, the process proceeds to steps S221 and S222.

If the next visit date is a day after the new deadline, the process proceeds to step S231 (see Fig. 13).

In step S221, the screen unit 211 updates the adjustment screen 130.

The update method is the same as step S140 (refer to FIG. 5) in the first embodiment.

In step S222, the planning unit 213 determines the visit date before the new deadline date as the maintenance work day. Specifically, the planning unit 213 selects the visit date immediately before the new due date from the maintenance plan data 120. The selected visit date becomes the maintenance work day.

Then, the planning unit 213 registers the maintenance work day in the maintenance plan data 120.

In step S231 (refer to FIG. 13), the limiting unit 214 restricts the operation of the monitored object 110.

Specifically, the restriction unit 214 generates an operation instruction corresponding to the designated operation restriction. Then, the communication unit 292 transmits the generated operation command to the monitoring target 110. The monitored object 110 receives an operation command and operates according to the received operation command. Thereby, the operation of the monitoring target 110 is restricted.

In step S232, the prediction unit 215 calculates a time series of risk values after the restriction.

The risk value time series after restriction is a risk value time series after the operation of the monitored object 110 is restricted.

Specifically, the prediction unit 215 calculates a future risk value time series of the monitoring target 110 based on the operation after the restriction of the monitoring target 110 and the past risk value time series of the monitoring target 110 .

To calculate the risk value time series, a conventional risk-based maintenance calculation method can be used.

In step S233, the adjustment unit 212 calculates the deadline date after the restriction.

The deadline date after the restriction is a deadline date corresponding to the designated allowable value after the operation of the monitored object 110 is restricted.

Specifically, the adjustment unit 212 calculates a deadline date after the restriction based on the designated allowable value and the time series of the risk value after the restriction. The deadline date after the restriction is the day when the risk value reaches the specified tolerance. In other words, the deadline date after the restriction is the day corresponding to the risk value of the same value as the designated allowable value. Further, the storage unit 291 updates the memorized deadline date to the deadline date after the restriction.

In step S234, the screen unit 211 updates the adjustment screen 130.

Specifically, the screen unit 211 moves the allowable mark 132 of the adjustment screen 130 based on the designated allowable value, and displays the deadline mark 133 of the adjustment screen 130 based on the deadline date after the restriction. Move.

The procedure of step S234 is the same as that of step S140 (refer to FIG. 5) in the first embodiment.

In step S235, the planning unit 213 determines the maintenance work day based on the deadline date after the restriction.

Then, the planning unit 213 registers the maintenance work day in the maintenance plan data 120.

The procedure of step S235 is the same as that of step S150 (refer to FIG. 5) in the first embodiment.

15 and 16, the determination of the maintenance work day will be described.

Currently, it is a day after the second visit and a day before the third visit. In other words, the next visit is the third visit.

In Fig. 15, the risk graph shows a time series of risk values before the operation of the monitored object 110 is restricted.

The next visit (the third visit) is a day after the due date. Therefore, the operation of the monitoring target 110 is restricted.

In Fig. 16, the risk graph shows a time series of risk values after the operation of the monitored object 110 is restricted. Since the operation of the monitored object 110 is restricted, an increase in the risk value is suppressed.

The next visit (third visit) is the day before the due date, and the visit immediately before the due date is the third visit. Accordingly, the planning unit 213 determines the third visit date as the maintenance work day.

***Supplementary to Embodiment 2***

When it is difficult to include an increase in the risk value below the allowable value only by modifying the work contents at the time of the planned visit, instead of performing irregular maintenance, the operation of the monitored object 110 is partially restricted. Most of the members are deteriorated depending on the number of times they are used. Therefore, the progress of deterioration can be suppressed by limiting the number of times of use. The limiting unit 214 determines the level of the operation restriction so that the risk value at the next visit is less than the allowable value. When the risk value cannot be suppressed only by operation limitation, the planning unit 213 determines the additional visit date as the maintenance work day.

The contents of the operation restriction are determined in advance and registered in the storage unit 291. The content of the operation restriction may be displayed on the display of the management terminal 300. In addition, the operation restriction may be displayed on the display of the management terminal 300. In addition, the administrator may change the contents of the operation restriction on the restriction screen 140.

When the contents of the operation restriction are changed, the prediction unit 215 newly calculates a risk value time series. When it is estimated that the risk value exceeds the allowable value, similarly to the case where the operation restriction is not implemented, the planning unit 213 makes a maintenance plan so that irregular maintenance is performed.

The operation limitation may be applied to the entire apparatus or may be limited to a range directly related to a member undergoing deterioration.

For example, when deterioration occurs in a specific landing door of an elevator, the number of times the elevator is used on that floor may be limited.

Further, when deterioration in relation to the driving mechanism of the elevator occurs, the operating speed of the elevator car may be lowered, or the elevator car may be operated so that the number of passengers is limited by changing the setting of the capacity detection unit.

Further, when deterioration of the landing door is occurring, the operation speed or the starting acceleration of the door may be lowered when the door is opened or when the door is closed.

In addition, when deterioration occurs in a part of the hoistway, the speed of the elevator car may be reduced only when the elevator car passes through the deteriorated portion.

Administrators can select recommended items (restrictions on recommended actions). Recommended items are items that have a small influence and are selected by referring to common usage patterns.

A confirmation process may be provided before the selected motion restriction is applied. In the confirmation process, the display unit 393 displays on the display a time series of risk values and the next maintenance work day after the restriction notified from the maintenance planning device 200. The administrator, after checking the indication, determines the motion restrictions to be applied. Then, after the motion restriction to be applied is determined, the restriction unit 214 restricts the operation of the monitored object 110.

When the motion restriction is applied, the restriction unit 214 may notify the user of the monitored object 110 of the content of the applied motion restriction.

When the monitored object 110 is an elevator, a message may be displayed on a display in the elevator car, an e-mail may be transmitted to a pre-registered e-mail address, or a message may be displayed on an advertisement display installed around a landing door.

***Effect of Embodiment 2***

Even if the next visit date is later than the new due date, any one visit date can be set as the maintenance work day without adding the visit date.

Embodiment 3.

About the mode proposing the recommended operation limitation, the point which differs from Embodiment 1 and Embodiment 2 mainly from Embodiment 1 and Embodiment 2 is demonstrated based on FIG.

***Composition description***

The configuration of the maintenance planning system 100 is the same as the configuration in the first embodiment (refer to Fig. 1).

The configuration of the maintenance planning device 200 will be described with reference to FIG. 17.

The maintenance planning device 200 also includes a recommendation unit 216.

The maintenance plan program also causes the computer to function as the recommendation unit 216.

***A description of the operation***

The recommendation unit 216 determines in advance a recommended operation limit.

Specifically, the recommendation unit 216 determines the recommended operation restriction based on the operation history of the monitored object 110.

The operation history of the monitoring object 110 is data indicating the past operation status of the monitoring object 110 and is stored in advance in the storage unit 291.

When the administrator sets the allowable range of motion restriction, it is difficult to clearly designate the allowable range.

Thus, the recommendation unit 216 determines the recommended operation limit based on the operation history of the monitored object 110.

For example, when the monitored object 110 is an elevator, the recommendation unit 216 obtains the frequency of use for each time period or for each floor. Then, the recommending unit 216 selects a time zone or a floor with little influence as a limitation target, and determines the use limitation or speed limitation in the limitation target as the recommended motion limitation. The recommendation unit 216 selects a building that has an elevator of the monitoring target 110 and a building having a similar purpose or number of floors, based on the building data representing the information of each building, and limits the operation of the elevator in the selected building. The recommended motion limit may be determined based on the data for evaluating the effect. In other words, the recommendation unit 216 may determine the recommended motion restriction based on the influence of the previous motion restriction in a similar building.

***Effect of Embodiment 3***

Since the recommended operation restriction is determined in the maintenance planning system 100, the operation of the monitored object 110 can be appropriately restricted by the administrator selecting the recommended operation restriction on the restriction screen 140.

Embodiment 4.

About the mode of appropriately changing the maintenance plan when an event such as a large-scale disaster occurs, a point different from that of the first embodiment will be mainly described based on FIGS. 18 to 20.

***Composition description***

The configuration of the maintenance planning system 100 is the same as the configuration in the first embodiment (refer to Fig. 1).

Referring to Fig. 18, the configuration of the maintenance planning device 200 will be described.

The maintenance planning device 200 also includes an event unit 217.

The maintenance plan program also causes the computer to function as the event unit 217.

***A description of the operation***

Based on Fig. 19, an event response method will be described.

The event response method is part of the maintenance plan method.

In step S410, the event unit 217 determines whether a specific event has occurred.

A specific event is an event that requires a change in the allowable value, that is, an event that requires a change in a maintenance plan. The specific specific event is a large-scale disaster.

The occurrence of a specific event is detected by a person or a sensor.

When the occurrence of a specific event is detected, an occurrence notification is input to the maintenance planning device 200.

Then, when the occurrence notification is input to the maintenance planning apparatus 200, the event unit 217 determines that a specific event has occurred.

When a specific event has occurred, the process proceeds to step S420.

If no specific event has occurred, the process ends.

In step S420, the adjustment unit 212 calculates the event deadline.

The event due date is a due date corresponding to the event allowable value.

The event tolerance value is a tolerance value used when a specific event occurs.

Specifically, the setting range of the allowable value is previously stored in the storage unit 291.

Then, the adjustment unit 212 selects the upper limit allowable value from the setting range, and calculates the event deadline date based on the upper limit allowable value and the risk value time series. The event deadline is the day when the risk value reaches the upper limit limit. In other words, the event deadline is the day corresponding to the risk value equal to the upper limit allowable value. Further, the storage unit 291 updates the stored allowable value to the upper limit allowable value, and updates the stored deadline to the event deadline.

In step S430, the planning unit 213 determines a new maintenance work day based on the event deadline.

Then, the planning unit 213 changes the maintenance work day registered in the maintenance plan data 120 to a new maintenance work day.

The procedure for determining the new maintenance work day is the same as the procedure for determining the maintenance work day in step S150 (refer to Fig. 5) of the first embodiment.

***Supplementary to Embodiment 4***

In the case of a large-scale disaster, it is expected that personnel resources will be insufficient because a large number of emergency operations such as recovery work occur.

On the other hand, the manager has a request that he wants to use the facility as much as possible even when a large-scale disaster occurs.

Therefore, when a large-scale disaster occurs, the adjustment unit 212 automatically raises the allowable value. However, the adjustment unit 212 makes the allowable value after pulling up coincide with the upper limit of the allowable value that can be set at the time of normal. In other words, the tolerance is raised only when the tolerance is set low.

This makes it possible to suppress an increase in maintenance work while giving priority to emergency response.

It is specified in advance to the manager that the allowable value is raised in case of an emergency. For example, the display unit 393 displays a notification screen indicating the application condition and the range of variation on the display.

Depending on the purpose of the monitored object 110, priority maintenance work is required even in an emergency. For example, for the apparatus of a medical institution, priority maintenance work is required even in an emergency.

With respect to such a monitoring target 110, it can also be set so as not to raise an allowable value.

Also, depending on the scale of the disaster, it can be set so that the increase in the allowable value varies. For example, a tolerance value corresponding to the disaster scale is selected from a table in which the disaster scale and the tolerance value are correlated with each other.

In this way, even if it is an emergency service, it is possible to provide an appropriate service in a form in accordance with the intention of the manager by management based on the risk value and the allowable value.

Further, in the case of a large-scale disaster, by limiting the operation of the monitored object 110 according to the operation restriction (event operation restriction) applied at the time of the disaster occurrence, a more appropriate service can be executed.

In addition, the display unit 393 may display a setting screen for designating an allowable value applied in an emergency and an operation restriction on the display. And, in the setting screen, the administrator can designate the allowable value and the operation restriction applied in the case of an emergency, similarly to the case where the allowable value and the operation restriction are specified in normal times.

***Other configurations***

Embodiment 4 may be implemented in combination with Embodiment 2 or Embodiment 3. In other words, the maintenance planning device 200 may include a limiting unit 214, a predicting unit 215, and a recommending unit 216.

***Supplement of embodiment***

The maintenance planning apparatus 200 obtains the frequency of occurrence of each failure mode by using information on the deterioration state of a plurality of parts constituting the apparatus as determined by remote monitoring. The maintenance planning system 100 calculates a risk value for each failure mode by multiplying the degree of influence obtained from the effect at the time of occurrence of each failure mode by the frequency of occurrence of each failure mode, and obtains the sum of the risk values.

The maintenance planning apparatus 200 compares the allowable risk value set in advance with the total risk value of the current facility. Then, the maintenance planning device 200 corrects the plan of maintenance work for the facility at the stage in which it is predicted to exceed the permissible risk value.

The management terminal 300 displays the performance value of the total risk value and the predicted time series change to the manager (including the owner of the facility). In the management terminal 300, it is possible for the manager to change the permissible risk value based on the displayed total risk value.

The maintenance planning device 200 detects that the operation has been performed, and corrects the plan of the maintenance work.

Basically, maintenance work is planned and carried out on the basis of preset tolerances. However, it becomes possible to provide the maintenance service at the level required by the manager by changing the allowable value according to the situation.

The maintenance planning device 200 has a model of progression of deterioration accompanying the lapse of time or the number of uses of the element acquired by the acceleration test.

The maintenance planning device 200 uses the result of estimating the deterioration state of the part by utilizing both the output of the deterioration progress model and the information of the remote monitoring result.

In estimating the state of component deterioration, by integrating the calculation result in a time series model estimated in advance by an accelerated test with remote monitoring data and inspection data at the time of visit, it is possible to realize state estimation with higher accuracy.

The maintenance planning device 200 remotely limits (or suppresses) the operation (frequency or speed) of the device (all or part) when it is estimated that the total risk will exceed the allowable value before the next scheduled visit. Set up the device. In addition, the maintenance planning device 200 manages the contents of operation restrictions.

The management terminal 300 displays the contents of the allowable motion restriction and the contents of the motion restriction actually applied to the manager. In the management terminal 300, an operation to rewrite the contents of the allowable operation restriction can be executed.

The maintenance planning device 200 detects that the operation has been performed, and corrects the plan of the maintenance work.

If the parts are not likely to endure until the next scheduled maintenance due to rapid deterioration of the parts, etc., the deterioration of the parts is suppressed by implementing operation restrictions, and further maintenance can be avoided. What kind of operation restrictions are allowed is set in advance at the time of contract. The range of motion limits also includes complete stops. However, if the motion restriction is actually applied, there is a possibility that a request to cancel the motion restriction in an hurry may arise because the influence is large. Thus, it is possible for the administrator to easily change or cancel the contents of the operation restriction.

The maintenance planning device 200 extracts a condition in which the number of times the service is performed is small, based on the operation history data for each time zone in the normal time of the target device or for each operation target. Then, the maintenance planning apparatus 200 selects an object and contents of operation restriction, and causes the selected information to be displayed on the management terminal 300 as recommended contents.

The maintenance planning apparatus 200 temporarily changes the tolerance value of the risk set for each facility to a higher value than usual when a predetermined critical event such as a large-scale disaster occurs.

When there is a high possibility that the maintenance resource is insufficient, such as during a large-scale disaster, the increase in the amount of maintenance work can be suppressed by varying the permissible risk value of each gas. However, the maximum allowable risk value that can be changed (the minimum that can avoid the influence on the user's body) is not changed, and the allowable value of the gas whose allowable value is normally set to be low is raised within the range up to the maximum value.

The maintenance planning device 200 temporarily changes the permitted contents of the operation restriction set for each facility to a wider range than usual when a predetermined critical event such as a large-scale disaster occurs.

This is an elevator or escalator.

The maintenance planning apparatus 200 limits the number of times of opening/closing a door of a specific floor within a predetermined time to a predetermined number or less, and does not provide a service for calls that exceed that number. Alternatively, the maintenance planning device 200 allocates only other gases in the same bank.

The maintenance planning device 200 suppresses the starting acceleration or operation speed when the door is opened or when the door is closed on a specific floor or all floors.

The maintenance planning device 200 is a device that determines whether or not to travel based on a measurement set value of a sensor that detects a capacity in a car or an output of the sensor in all travel, travel in a specific direction, or service from a specific floor. The standard value of the judgment in is changed.

The hardware configuration of the maintenance planning device 200 will be described based on FIG. 20.

The maintenance planning device 200 includes a processing circuit 209.

The processing circuit 209 includes a screen unit 211, an adjustment unit 212, a planning unit 213, a limiting unit 214, a prediction unit 215, a recommendation unit 216, an event unit 217, and a storage unit. It is the hardware that realizes (291).

The processing circuit 209 may be dedicated hardware or may be a processor 201 that executes a program stored in the memory 202.

When the processing circuit 209 is dedicated hardware, the processing circuit 209 is, for example, a single circuit, a complex circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof.

ASIC is an abbreviation for Application Specific Integrated Circuit, and FPGA is an abbreviation for Field Programmable Gate Array.

The maintenance planning device 200 may be provided with a plurality of processing circuits replacing the processing circuit 209. The plurality of processing circuits share the role of the processing circuit 209.

In the maintenance planning apparatus 200, some functions may be realized by dedicated hardware, and the remaining functions may be realized by software or firmware.

In this way, the processing circuit 209 can be realized by hardware, software, firmware, or a combination thereof.

Based on FIG. 21, the hardware configuration of the management terminal 300 will be described.

The management terminal 300 includes a processing circuit 309.

The processing circuit 309 is hardware that realizes the control unit 311 and the storage unit 391.

The processing circuit 309 may be dedicated hardware or may be a processor 301 that executes a program stored in the memory 302.

When the processing circuit 309 is dedicated hardware, the processing circuit 309 is, for example, a single circuit, a complex circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof.

The management terminal 300 may be provided with a plurality of processing circuits replacing the processing circuit 309. The plurality of processing circuits share the role of the processing circuit 309.

In the management terminal 300, some functions may be realized by dedicated hardware, and the remaining functions may be realized by software or firmware.

In this way, the processing circuit 309 can be realized by hardware, software, firmware, or a combination thereof.

The embodiment is an illustration of a preferred embodiment and is not intended to limit the technical scope of the present invention. The embodiment may be implemented partially or may be implemented in combination with other embodiments. The procedure described using a flowchart or the like may be appropriately changed.

100: maintenance planning system
101: network
110: monitoring target
111: sensor
120: repair plan data
130: Adjustment screen
131: risk graph
132: allowed mark
133: deadline mark
134: change interface
140: Restriction screen
141: restricted interface
200: maintenance planning device
201: processor
202: memory
203: auxiliary storage device
204: communication device
209: processing circuit
211: screen part
212: adjustment unit
213: Planning Department
214: restriction
215: prediction unit
216: Recommendation
217: event section
291: memory
292: Ministry of Communications
300: management terminal
301: processor
302: memory
303: auxiliary storage device
304: communication device
305: input/output interface
309: processing circuit
311: control unit
391: memory
392: Ministry of Communications
393: display
394: Reception

Claims (12)

A display unit for displaying an adjustment screen including a risk graph representing a time series of risk values, a tolerance mark representing a tolerance, a deadline mark representing a deadline for the risk value to reach the tolerance, and a change interface for changing the tolerance;
A reception unit that accepts a specified tolerance value specified by the change interface whenever maintenance is being performed based on a maintenance plan created at the time of installation of the monitoring object or a maintenance plan modified after the installation of the monitoring object;
An adjustment unit that calculates a new deadline date based on the designated tolerance and the risk value time series,
A planning unit that selects a next visit date from maintenance plan data indicating a visit schedule, and determines a visit date before the new due date as a maintenance work day when the next visit date is a day before the new due date;
When the next visit is a day later than the new deadline, an operation restriction such as limiting the number of times of use on a specific floor for the monitored elevator, and an operation restriction such as lowering the operation speed of the elevator car , Motion restriction to limit the number of passengers, motion restriction to reduce the speed of operation of the door or the acceleration of door activation when the door is opened and closed, and the speed of the elevator car when the elevator car passes through a part of the hoistway. A limiting unit that restricts at least one of the operation limits that decreases
When the next visit date is a day later than the new due date, a prediction unit that calculates a time series of the limiting risk value
And,
The adjustment unit calculates a deadline date after the restriction based on the designated allowable value and the risk value time series after the restriction,
The planning unit, when the next visit date is a day later than the new deadline, determines the maintenance work day based on the deadline date after the restriction.
Remuneration planning system.
The method of claim 1,
And a screen unit for moving the allowable mark of the adjustment screen based on the designated allowable value, and moving the deadline mark of the adjustment screen based on the new deadline.
The method of claim 1,
The risk graph is a line graph,
The allowable mark is a straight line,
The change interface is an up button for raising the permission mark and a down button for lowering the permission mark.
Remuneration planning system.
The method of claim 1,
The display unit displays a restriction screen including a restriction interface for designating an operation restriction on the monitoring object,
The reception unit receives the specified operation restriction specified by the restriction interface whenever maintenance is being performed based on a maintenance plan created at the time of installation of the monitoring object or a maintenance plan modified after installation of the monitoring object. ,
The restriction unit, when the next visit date is a day later than the new due date, changes the operation restriction of the monitoring target according to the designated operation restriction,
The prediction unit calculates a risk value time series after the restriction based on the specified operation restriction when the next visit date is a day after the new due date.
Remuneration planning system.
The method of claim 4,
The limiting interface includes an interface for designating a recommended operating limit.
The method of claim 5,
Selecting a building similar to the building with the monitoring target based on the building data representing the information of each building, and determining the recommended motion restriction based on the data evaluating the effect of the motion restriction of the elevator in the selected building. Maintenance planning system equipped with a recommendation unit.
The method according to any one of claims 1 to 6,
The maintenance planning system includes an event unit that determines whether a large-scale disaster has occurred,
The adjustment unit calculates an event due date based on the event tolerance and the risk value time series in case of a large-scale disaster,
The planning unit changes the maintenance work date based on the event deadline in the event of a large-scale disaster.
Remuneration planning system.
The display unit displays an adjustment screen including a risk graph indicating a time series of risk values, a tolerance mark indicating a tolerance value, a deadline mark indicating a deadline for the risk value to reach the tolerance value, and a change interface for changing the tolerance value,
The reception unit receives the specified allowance specified by the change interface whenever maintenance is being performed based on the maintenance plan created at the time of installation of the monitoring object or the maintenance plan modified after the installation of the monitoring object,
The adjustment unit calculates a new deadline date based on the designated tolerance value and the risk value time series,
The planning department selects the next visit date from the maintenance plan data indicating the visit schedule, and when the next visit date is a day before the new due date, the visit date before the new due date is determined as the maintenance work day,
When the next visit date is a day after the new deadline, the limiting unit restricts the number of times of use of the monitored elevator on a specific floor, and decreases the operating speed of the elevator car. Motion restriction, motion restriction such as limiting the number of passengers, motion restriction such as lowering the operation speed of the door or the starting acceleration of the door when the door is opened and closed, and the elevator when the elevator car passes through a part of the hoistway At least one of the motion restrictions that decreases the speed of the car is applied,
The prediction unit calculates a limiting risk value time series when the next visit date is a day later than the new due date,
The adjustment unit calculates a deadline date after the restriction based on the designated allowable value and the risk value time series after the restriction,
The planning unit, when the next visit date is a day later than the new deadline, determines the maintenance work day based on the deadline date after the restriction.
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