JP2019201124A - Maintenance system - Google Patents

Abstract

To provide a maintenance system capable of securing quality and productivity of products by performing appropriate maintenance.SOLUTION: A component mounting system including arranged component mounting facilities includes a maintenance management unit 3b as a maintenance system for managing maintenance for a maintenance object. The maintenance management unit has a configuration comprising: a history storage unit 35 for storing a period in which past maintenance was performed on the maintenance object and an index value showing states of the maintenance object before and after the period in which past maintenance was performed; and a maintenance determination unit 33 for determining a content of maintenance required for the maintenance object on the basis of the period of the past maintenance and the index value before and after the period of the past maintenance stored in the history storage unit 35.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a maintenance system that manages maintenance in a component mounting system in which component mounting facilities are arranged.

  In a component mounting system that mounts components on a substrate to manufacture a mounting substrate, a plurality of component mounting facilities such as a component mounting apparatus are arranged. In these component mounting facilities, consumable components that require maintenance and replacement such as cleaning, such as nozzles that attract and hold components, are used. Since it is necessary to perform maintenance on these parts as essential work on a daily basis, various improvements and countermeasures for efficiently performing such maintenance work have been proposed (for example, Patent Document 1). In the prior art shown in this patent document example, an example is described in which cleaning using air blow, ultrasonic cleaning, or the like is performed on a nozzle held by a nozzle attaching / detaching jig.

Japanese Patent Laying-Open No. 2015-88574

  However, the prior arts including the prior art shown in the above-mentioned patent document examples have the following disadvantages in managing maintenance work. First, in the prior art, a fixed period that is set in advance based on experience, actual results, or the like is applied to the period in which maintenance is performed next after the last maintenance is performed, regardless of the maintenance target state. For this reason, when the maintenance target becomes in a state where effective maintenance is impossible due to deterioration over time, etc., the threshold value is exceeded in the confirmation measurement performed after maintenance, and it is determined that the equipment cannot be used. There were many suspensions.

  Conventionally, when executing maintenance, a recovery rate indicating how much the maintenance target has been recovered has been obtained based on a result obtained by confirmation measurement after maintenance. By obtaining such a recovery rate, it is possible to determine the effectiveness of the maintenance, which serves as a guideline for performing maintenance on the target. The restoration rate is based on the shipping state, and the restoration rate is calculated by comparing the index value indicating the state after the maintenance with the index value in the state at the time of shipment.

  Although the recovery rate obtained in this way can be used to determine whether the state of the maintenance target at the time after maintenance is good or not, it is not necessarily effective for the maintenance work itself performed. It was not connected with the judgment. In other words, if the status of the maintenance target is good to some extent immediately before the maintenance, the recovery rate will be a value corresponding to the good status even if there is little effect of the maintenance work performed, and an appropriate guideline for maintenance effectiveness Was a difficult thing. As described above, in the maintenance management of the prior art, the setting of the maintenance period and the operation of the recovery rate are not necessarily rational and appropriate, resulting in a decrease in quality and a decrease in productivity. .

  Therefore, an object of the present invention is to provide a maintenance system that can perform appropriate maintenance to ensure product quality and productivity.

  The maintenance system of the present invention is a maintenance system that manages maintenance for a maintenance target in a component mounting system in which component mounting equipment is arranged, and the time when past maintenance was performed on the maintenance target and the past A history storage unit that stores an index value indicating the state of the maintenance target before and after the maintenance is performed, and the past maintenance timing and the past maintenance timing stored in the history storage unit A maintenance determination unit that determines the content of maintenance necessary for the maintenance target based on the index value in FIG.

  According to the present invention, proper maintenance can be performed to ensure product quality and productivity.

Configuration explanatory diagram of a component mounting system according to an embodiment of the present invention The fragmentary sectional view of the component mounting apparatus arrange | positioned at the component mounting system of one embodiment of this invention The block diagram which shows the structure of the maintenance system of one embodiment of this invention Explanatory drawing of the maintenance object in the maintenance system of one embodiment of this invention The flowchart which shows the maintenance execution time setting process in the maintenance system of one embodiment of this invention The indicator line graph which shows transition of the indicator value in the maintenance system of one embodiment of the present invention

  Next, embodiments of the present invention will be described with reference to the drawings. First, a configuration of a component mounting system 1 that is an application target of the maintenance system of the present embodiment will be described with reference to FIG. The component mounting system 1 has a function of mounting a component on a substrate and producing a mounted substrate. In the present embodiment, a plurality (here, lines ML1 to ML3) of component mounting lines 4 are connected to the management apparatus 3 via the communication network 2. Operations such as operation and maintenance of each facility in each component mounting line 4 are managed by the management device 3.

  The management device 3 is provided with a mounting management unit 3a, a maintenance management unit 3b, and a display unit 3c. The mounting management unit 3a transmits data necessary for component mounting work executed by each facility belonging to the component mounting line 4 to each facility, and the processing result by each facility is transmitted to the mounting management unit 3a. The maintenance management unit 3b manages the maintenance work performed on the maintenance target of each component mounting facility arranged in the component mounting system 1. That is, the maintenance management unit 3b functions as a maintenance system that manages maintenance for the maintenance target in the component mounting system 1.

  The display unit 3c displays various notification screens and input screens necessary for management by the mounting management unit 3a and the maintenance management unit 3b. This screen includes an index line graph (see FIG. 6) that visually displays changes over time in the index value of the maintenance object.

  Each component mounting line 4 is connected in series with a plurality of component mounting facilities, that is, a substrate supply device M1, a substrate delivery device M2, a solder printing device M3, component mounting devices M4 and M5, a reflow device M6, and a substrate recovery device M7. Are arranged. The substrate 13 (see FIG. 2) supplied by the substrate supply device M1 is carried into the solder printing device M3 via the substrate delivery device M2, and a solder printing operation for screen printing solder for component joining on the substrate 13 is performed here. Is called.

  The board 13 after the solder printing is sequentially delivered to the component mounting apparatuses M4 and M5, where a component mounting operation for mounting an electronic component on the board 13 after the solder printing is executed. Then, the substrate 13 after the component mounting is carried into the reflow apparatus M6, where the component joining solder is melted and solidified by being heated according to a predetermined heating profile. As a result, the electronic component is solder-bonded to the substrate 13 to complete the mounting substrate on which the electronic component is mounted on the substrate 13, and is collected by the substrate collecting device M7.

  Next, the configuration and function of the component mounting apparatuses M4 and M5 will be described with reference to FIG. In FIG. 2, which shows a cross-section of the main parts of the component mounting apparatuses M4 and M5, a substrate transport mechanism 12 is disposed on the base 11 in the substrate transport direction (X direction, the direction perpendicular to the drawing in the drawing). The board transport mechanism 12 includes a conveyor 12 a that transports the board 13, and positions and holds the board 13 carried in from the solder printing apparatus M <b> 3 at a mounting work position by the component mounting mechanism 17.

  The component mounting mechanism 17 is disposed on both sides (the front side (1F) and the back side (1R) in the operation direction) of the substrate transport mechanism 12, and the mounting head 19 (nozzle head) is moved by the head moving mechanism 18 in the X direction and the Y direction. It is configured to move horizontally. A nozzle holder 19 a is provided at the lower end of the mounting head 19, and an electronic component is taken out from the tape feeder 15 by the nozzle 20 attached to the nozzle holder 19 a and transferred and mounted on the substrate 13.

  A component supply unit 14 is disposed on the side of the substrate transport mechanism 12 in the Y direction (a direction orthogonal to the X direction). A carriage 21 in which the tape feeder 15 is mounted in advance is set in a plurality of feeder mounting slots (not shown) provided in the feeder base 21a. The carriage 21 holds a tape reel 22 that stores a carrier tape 23 holding electronic components in a wound state. The carrier tape 23 pulled out from the tape reel 22 is pitch-fed by the tape feeder 15 to the component removal position by the nozzle 20.

  A component recognition camera 16 is disposed between the component supply unit 14 and the substrate 13. When the mounting head 19 that has picked up the electronic component from the tape feeder 15 by the nozzle 20 moves above the component recognition camera 16, the component recognition camera 16 picks up an image of the electronic component that is sucked and held by the nozzle 20. Each of the component mounting apparatuses M4 and M5 includes a power supply unit 24, and the power supply unit 24 supplies power for operation to a drive unit and a control device in the apparatus.

  The component mounting apparatuses M4 and M5 having the above-described configuration, the conveyor 12a of the board transport mechanism, the nozzle holder 19a of the mounting head 19 configuring the component mounting mechanism 17, the nozzle 20 mounted on the nozzle holder 19a, the power supply unit 24, etc. Each of them is a maintenance target that periodically performs maintenance work such as inspection and cleaning. In the component mounting system 1 shown in the present embodiment, management of maintenance work to be performed on these maintenance targets is efficiently executed by the function of the maintenance management unit 3b described above.

  Then, codes (ML1, ML2, ML3) for identifying the component mounting line 4, codes (M4, M5) for identifying the component mounting devices M4, M5, codes (1F), (1R), etc. for identifying the component mounting mechanism 17 A code for specifying each part, such as a code for specifying the mounting head 19 that is a nozzle head, is used as an identification code for specifying the above-described maintenance target when the maintenance management unit 3b performs management.

  Next, the configuration of the maintenance management unit 3b provided along with the management device 3 will be described with reference to FIG. In FIG. 3, a maintenance management unit 3 b associated with the management device 3 is connected to the component mounting system 1 via the communication network 2. Thereby, various signals and data can be transmitted and received between each part of the maintenance management part 3b and each equipment of the component mounting system 1.

  In the configuration shown here, an example is shown in which the maintenance management unit 3b is configured as a part of the processing function of the management device 3. However, the affiliation and arrangement of the maintenance management unit 3b in the component mounting system 1 are arbitrary. For example, the maintenance management unit 3b may be configured as a device independent of the management device 3, or a function equivalent to that of the maintenance management unit 3b is given to any one of the plurality of component mounting lines 4. May be.

  The maintenance management unit 3b includes a processing unit 31 and a storage unit 32. The processing unit 31 executes a predetermined process for the maintenance target based on the data stored in the storage unit 32. That is, the processing unit 31 is provided with a maintenance determining unit 33 that determines the “maintenance content” 40 and a maintenance execution processing unit 34 that performs processing necessary for execution of maintenance. In addition, the storage unit 32 includes a history storage unit 35 that stores history data used to determine the “maintenance content” 40 by the maintenance determination unit 33 and a maintenance execution information storage unit 36 that stores a processing result by the processing unit 31.

  History data related to maintenance stored in the history storage unit 35 will be described. The history storage unit 35 stores “maintenance execution time” 46, “maintenance execution content” 47, and “index value data” 48. The “maintenance execution time” 46 is data indicating a time when maintenance has been performed in the past for each maintenance target. “Maintenance execution content” 47 indicates the content of maintenance performed on each maintenance target.

  The “index value data” 48 is data relating to an index value indicating a maintenance target state. Here, the index value is a characteristic value that quantitatively represents the functional state of a component (for example, a nozzle) or a unit (for example, a nozzle holder) that is a maintenance target by numerical data. For example, in the case of a nozzle, the vacuum flow rate when the nozzle is vacuum-sucked in a specified state is used as an index value, and in the case of a nozzle holder, the pushing load when the held nozzle is pressed is used as the index value. It is done.

  Here, “index value at shipping” 48 a and “index value at maintenance” 48 b are stored as “index value data” 48. The “shipment index value” 48a is an index value as an initial value at the time of shipment of the maintenance target, and the index value at the time of shipment is used as a reference indicating the state of the maintenance target. The “maintenance index value” 48b is an index value indicating a state after maintenance is performed on the maintenance target. In this index value, a threshold value that defines a state in which a part or unit that is a maintenance target can be normally used is set for each maintenance target.

  In the present embodiment, the ratio of the “maintenance index value” 48b to the “shipment index value” 48a is defined as a recovery rate indicating how the maintenance target function has been improved by performing maintenance. In the present embodiment, the maintenance determination unit 33 determines the effectiveness of the maintenance being performed based on the sequential fluctuation of the recovery rate.

  Based on this determination, a “maintenance type” 42 and a “maintenance execution time” 43 for the “maintenance target” 41 are determined. In this maintenance content determination, the maintenance determination unit 33 determines the maintenance content necessary for the maintenance target so that the maintenance target state maintains an index value exceeding the above-described threshold value in the good determination direction. (Refer to the index line graph shown in FIG. 6).

  In other words, the maintenance determining unit 33 determines the “maintenance content” 40 necessary for the maintenance target based on the past maintenance time stored in the history storage unit 35 and the index values before and after the past maintenance time. To do. Here, the index value before the maintenance time means an index value at the time of shipment.

  The above-described index value acquisition is performed by the maintenance execution processing unit 34 executing the index value acquisition process 44. In other words, desired measurement data is acquired and imported as an index value by a measurement function provided in the target equipment, or by using an exclusive measurement unit that is brought in by an operator and attached externally. The fetched index value is stored as “index value data” 48 in the history storage unit 35. Then, each time maintenance is executed, the maintenance execution processing unit 34 executes the recovery rate calculation process 45 to calculate the recovery rate of the maintenance target. The calculated recovery rate is stored as “recovery rate calculation data” 50 in the maintenance execution information storage unit 36.

  Details of the “maintenance content” 40 will be described here. In the determination of “maintenance content” 40 by the maintenance determination unit 33, the following “maintenance object” 41, “maintenance type” 42, and “maintenance execution time” 43 are determined. Here, “maintenance target” 41 is data for specifying a component or unit to be maintained in the component mounting system 1, and is specified by the items shown in FIG. When the maintenance content is determined by the maintenance determining unit 33, the following items are determined for each maintenance target defined by the “maintenance target” 41.

  “Maintenance type” 42 is data defining the degree of maintenance to be performed. That is, as will be described with reference to FIG. 4, a light maintenance performed by a relatively simple method, a heavy maintenance performed more carefully than a light maintenance using a tool or the like, and such a maintenance is difficult to recover. The degree of maintenance, that is, replacement with a new one that is selected when it is determined, is defined in advance. When the maintenance content is determined by the maintenance determining unit 33, the following items are determined for each maintenance target defined by the “maintenance target” 41.

  The “maintenance execution timing” 43 is a period from the last maintenance to the next maintenance for the maintenance target defined by the “maintenance target” 41. Here, as the period, the operating time, the number of times of use, and the like are appropriately selected and used depending on the type of equipment. That is, the necessary maintenance content determined by the maintenance determination unit 33 in the present embodiment includes the degree of maintenance, replacement of the maintenance target, and the period from the last maintenance to the next maintenance. It has become. The “maintenance content” 40 determined by the maintenance determination unit 33 in this way is stored as “maintenance content data” 49 in the maintenance execution information storage unit 36 of the storage unit 32.

  Here, an example of “maintenance target” 41 will be described with reference to FIG. In addition, the example shown here is an example of the site | part used as the object of a maintenance operation | work in the component mounting system 1, and the maintenance object used as the application object of this invention exists about each apparatus which comprises the component mounting line 4. FIG.

  As shown in FIG. 4, “maintenance target” 41 includes “line NO” 41 a, “unit ID” 41 b, “facility ID” 41 c, “maintenance location” 41 d, and “maintenance type” 42. The “line NO” 41a is a number for identifying the component mounting line 4 shown in FIG. 1. By specifying the “line NO” 41a, the component mounting line 4 to be maintained in the component mounting system 1 is specified. The

  The “unit ID” 41b is an item that comprehensively specifies a range to be subjected to maintenance work. Here, in the configuration shown in FIG. 2, as a comprehensive range when the mounting head 19 is a work target, a comprehensive range in units of mechanism units such as “nozzle head” 1 and “nozzle head” 2, “apparatus” M5, etc. As described above, a comprehensive range set as appropriate, such as a comprehensive range in units of individual devices, is used.

  The “equipment ID” 41c is an identification code for specifying the maintenance target in units of equipment, and is appropriately set in relation to the “unit ID” 41b. Here, in “nozzle head” 1 and “nozzle head” 2 as “unit ID” 41b, these are arranged on the back side (1R) shown in FIG. 2, and “M5” It shows that the entire component mounting apparatus M5 is included in the maintenance work.

  The “maintenance part” 41d specifically indicates a part to be subjected to the maintenance work. The “maintenance type” 42 indicates a category of the degree of work that is specifically executed for the “maintenance part” 41d. That is, here, the work to be performed on the maintenance target is divided into three categories, “mild” (mild maintenance), “severe” (severe maintenance), and “replacement”, according to the level of the execution contents. In accordance with the state, the maintenance work of an appropriate division is executed from among the three.

  Here, “mild maintenance” refers to light cleaning that removes foreign matter by simple operations such as air blowing and lubrication of rotating and sliding parts without requiring removal or disassembly of the parts that make up the target part. This refers to maintenance work that can be performed without requiring long-term equipment outages. “Severe maintenance” means, for example, heavy cleaning to remove foreign matters by ultrasonic cleaning or polishing after disassembling the target part and sliding of rotating parts and sliding parts to some extent. Maintenance work that requires equipment downtime during work hours. “Replacement” is an option presented when improvement of the state cannot be confirmed even after executing the above-mentioned severe maintenance. Note that the definitions of “unit ID” 41b, “equipment ID” 41c, “mild”, and “severe” are convenient, and may be appropriately set according to the convenience of maintenance work management.

  Next, the maintenance execution time setting process will be described with reference to FIGS. This processing is executed by the maintenance determination unit 33 based on the maintenance history stored in the history storage unit 35. In the present embodiment, the maintenance execution time is obtained on an index line graph (see FIG. 6) displaying the transition of the index value to be maintained in time series.

  Here, the index line graph will be described. The index line graph is obtained by the maintenance execution processing unit 34 of the maintenance management unit 3b acquiring the measurement values acquired by measuring the individual maintenance targets at predetermined intervals in each facility constituting the component mounting system 1. It is done. Then, the index line graph created based on the obtained measurement value is displayed on the display unit 3 c provided in the management device 3. As a result, the operator can perform appropriate maintenance management while visually confirming the change with time of the maintenance target state.

  FIG. 6A shows an index line graph at the time of maintenance work planning. In this index line graph, the horizontal axis represents the period and number of times indicating the operation time and frequency of the maintenance target, and the vertical axis represents the index value for the target maintenance target. If the index value at the time of shipment (initial value R0), which serves as the index value reference, is the reference (100%), the index value after maintenance in FIG. 6 corresponds to the recovery rate defined above. In FIG. 6, items at the time of planning are described with parentheses, and those actually realized are separated by removing the parentheses.

  The index line graph shown in FIG. 6A is a maintenance work plan, and ideal virtual index lines (L1), (L2), and (L3) are drawn. Here, the threshold value at the timing (t1) when the index value that was the initial value R0 corresponding to the state at the time of initial shipment decreases with the passage of time due to equipment operation and the preset interval (T0) has elapsed. A pattern for Rth is shown. Here, by performing predetermined maintenance at timing (t1), the index value has an ideal pattern of recovery to the initial value R0 (recovery rate 100%), and subsequent timings (t2) and (t3) The same ideal pattern is repeatedly executed by performing maintenance in the same manner.

  In the maintenance execution time setting process shown in the present embodiment, an appropriate maintenance execution time is obtained by modifying the ideal pattern shown in FIG. 6A in accordance with actual data reflecting the actual operation state. I am doing so. FIG. 6B shows the transition of the index value in the state where the same work is continuously executed from the initial value R0 in the same maintenance target as in the example shown in FIG.

  In the index line L1 * indicating the transition of the actual index value in the example shown here, the index value becomes the threshold value Rth at the timing t1 * when the interval T1 * longer than the previously planned interval (T0) has elapsed. ing. If the index value falls below the threshold value Rth, the facility operation cannot be continued, and therefore maintenance is performed at this timing t1 *. As a result, the index value rises from the threshold value Rth. At this time, the index value does not always recover to the initial value R0 due to the effect of the maintenance, and often only reaches the post-maintenance index value R1 with a recovery rate of less than 100%. The maintenance execution time setting in such a case is executed as follows along the flow shown in FIG.

  First, the inclination of the index line before the latest maintenance is obtained (ST1). That is, in the example shown in FIG. 6B, the slope of the index line L1 * indicating the transition of the actual index value is obtained. Next, the index line after the current maintenance is extended with the obtained inclination (ST2). That is, the maintenance is executed at timing t1 *, and the index line after the index value is restored to the post-maintenance index value R1 is extended with the same slope as the slope of the index line L1 *.

  Then, the time when the extended index line (L2 *) crosses the level of the predetermined threshold Rth is specified (ST3). Thereby, as shown in FIG. 6B, the timing (t2) at which the interval (T2) has elapsed from the timing t1 * at which the maintenance is executed is specified. Then, the next maintenance execution time is determined based on the specified time (ST5). That is, the timing (t2) is determined as the next maintenance execution time, and the determined maintenance execution time is written in the maintenance execution information storage unit 36 (ST6).

  Thereafter, the operation is continuously performed from the state where the index value has recovered to the post-maintenance index value R1. Then, the maintenance is performed again at the timing t2 * at which the index line L2 * indicating the transition of the actual index value intersects the level of the threshold value Rth. At this time, the timing t2 * does not necessarily match the timing t (2) predicted in advance, but the timing t (2) is determined based on the slope of the index line L1 * indicating the transition of the actual index value. Therefore, the difference is small, and a maintenance plan with excellent prediction accuracy is realized. In addition, when the above-mentioned difference is small, you may make it perform a maintenance at the timing t (2) estimated beforehand.

  Even after this, the setting of the interval execution time based on the transition of the actual index value is repeatedly executed. That is, as shown in FIG. 6C, the slope of the index line L2 * indicating the transition of the actual index value is obtained. Next, the index line after the current maintenance is extended with the obtained inclination. That is, the maintenance is executed at the timing t2 *, and the index line (L3 *) after the index value is restored to the post-maintenance index value R2 is extended with the same slope as the slope of the index line L2 *.

  Then, the time when the extended index line (L3 *) intersects the level of the predetermined threshold value Rth is specified. That is, as shown in FIG. 6C, the timing (t3) at which the interval (T3) has elapsed from the timing t2 * at which the maintenance is performed is specified. Based on the specified time, the next maintenance execution time is similarly determined.

  As shown in the maintenance execution time setting process described above, the maintenance determination unit 33 maintains an index value that exceeds the threshold value Rth, which is a predetermined threshold value, in the good determination direction, that is, the direction approaching the initial value R0. The contents of maintenance necessary for the maintenance target are determined. Further, in the present embodiment, the maintenance is managed in consideration of the fluctuation of the recovery rate calculated every time maintenance is performed.

  That is, for each maintenance, the degree of improvement of the index value is grasped by the execution of the maintenance, and the effectiveness of the performed maintenance is evaluated. Based on this evaluation, appropriate intervals for maintenance to be performed can be set, and the degree of maintenance required, that is, whether light maintenance, heavy maintenance, or parts or units need to be replaced can be appropriately determined. It is possible. As a result, more appropriate maintenance can be performed as compared with the conventional technique in which a fixed maintenance interval is applied.

  As described above, in the maintenance system shown in the present embodiment, the index value indicating the time when the past maintenance is performed on the maintenance target and the state of the maintenance target before and after the time when the past maintenance is performed. A history storage unit 35 for storing, and a maintenance determination unit for determining the content of maintenance necessary for the maintenance target based on the past maintenance time stored in the history storage unit 35 and the index values before and after the past maintenance time. It is set as the structure provided with. With such a configuration, proper maintenance can be performed to ensure product quality and productivity.

  The maintenance system of the present invention has an effect that proper maintenance can be performed to ensure product quality and productivity, and is useful in the field of manufacturing a mounting board in which components are mounted on a board.

DESCRIPTION OF SYMBOLS 1 Component mounting system 2 Communication network 4 Component mounting line M4, M5 Component mounting apparatus R0 Initial value R1, R2 Index value after maintenance Rth threshold (L1), (L2), (L3), L1 *, L2 *, L3 * index line

Claims (8)

A maintenance system for managing maintenance for a maintenance target in a component mounting system in which component mounting equipment is arranged,
A history storage unit for storing an index value indicating a state of the maintenance target before and after the time when the past maintenance is performed on the maintenance target and the time when the past maintenance is performed;
A maintenance determination unit that determines the content of maintenance necessary for the maintenance target based on the index value before and after the past maintenance time and the past maintenance time stored in the history storage unit;
A maintenance system.   The maintenance system according to claim 1, wherein the index value indicating the state of the maintenance target is based on an index value at the time of shipment of the maintenance target.   3. The maintenance determination unit according to claim 1, wherein the maintenance determination unit determines the content of maintenance necessary for the maintenance target so as to maintain the index value in which the state of the maintenance target exceeds a predetermined threshold in a good determination direction. Maintenance system.   The maintenance system according to claim 1, wherein the necessary maintenance content includes a degree of maintenance.   The maintenance system according to claim 1, wherein the content of the necessary maintenance includes replacement of the maintenance target.   The maintenance system according to claim 1, wherein the content of the necessary maintenance includes a period from the last maintenance to the next maintenance.   The said maintenance determination part determines the content of the said required maintenance based on the recovery rate which shows the ratio of the said index value after the maintenance with respect to the said index value at the time of the shipment. Maintenance system.   The maintenance system according to any one of claims 1 to 7, further comprising a display unit that visually displays a change with time of the index value.

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