Management device of work machine

Abstract

To provide a management device of a work machine which can reduce the number of times of maintenance of the work machine by suppressing deviation of a usage degree of a plurality of actuators.SOLUTION: A management device 2 acquires a cumulative load of each actuator, calculates a usage degree of each actuator on the basis thereof, and calculates a usage ratio of each actuator on the basis thereof. The management device 2 acquires a business category average usage ratio indicating an average usage ratio of each actuator in an arbitrary business category, and determines whether or not the work machine 1 is suitable for operation in the arbitrary category on the basis of the usage ratio and the business category average usage ratio of each of the multiple actuators to output results of the determination.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a work machine management device that manages a work machine having a plurality of actuators. [Background technology]

[0002] A shovel, which is one type of work machine, includes, for example, a lower traveling body, an upper rotating body rotatably provided above the lower traveling body, and a working device connected to the upper rotating body. The working device includes, for example, a boom rotatably connected to the upper rotating body, an arm rotatably connected to the boom, and an attachment rotatably connected to the arm.

[0003] The above-mentioned shovel is equipped with a plurality of actuators, including a travel motor for traveling the travelling body, a motor for rotating the rotating body, a boom cylinder for rotating the boom, an arm cylinder for rotating the arm, and an attachment cylinder for rotating the attachment.

[0004] Patent Document 1 discloses a management device that manages a plurality of shovels. This management device selects, from among the plurality of shovels, an shovel that has a function that a user plans to use with a low degree of usage, and lends it to the user. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2005-196399 A Summary of the Invention [Problem to be solved by the invention]

[0006] The degree of actuator usage is an index for planning the maintenance of a work machine. The degree of actuator usage can be expressed as the ratio of the cumulative load of the actuator to a predetermined reference value (more specifically, a value that serves as a guideline for maintenance or life span). For example, a high degree of actuator usage serves as a guideline for performing maintenance on that actuator. Furthermore, if the usage of two or more actuators is high at the same time, maintenance for those actuators can be performed simultaneously, making it possible to reduce the frequency of maintenance for the work machine. However, if there is a bias in the usage of multiple actuators due to reasons such as the work machines being operated in a particular business format, it is not possible to perform maintenance simultaneously, making it impossible to reduce the frequency of maintenance for the work machine.

[0007] The present invention has been made in consideration of the above-mentioned circumstances, and its object is to provide a work machine management device that can suppress bias in the usage of multiple actuators and reduce the number of maintenance operations required for the work machine. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the present invention provides a work machine management device that manages a work machine having a plurality of actuators that drive a body including a working implement, and obtains, for each of the plurality of actuators, a cumulative load that is the accumulation of the load acting on the actuator while the actuator was in use, calculates, for each of the plurality of actuators, a usage level that is the ratio between the cumulative load and a predetermined reference value, calculates, for each of the plurality of actuators, a usage ratio that is the ratio between the usage level and the total value of the usage levels of the plurality of actuators, obtains a business type average usage ratio that indicates the average usage ratio of each of the plurality of actuators in an arbitrary business type, and determines whether or not it is suitable for the work machine to be operated in the arbitrary business type based on the usage ratio of each of the plurality of actuators and the business type average usage ratio, and outputs the determination result. Effect of the Invention

[0009] According to the present invention, it is possible to prevent uneven usage of a plurality of actuators and reduce the frequency of maintenance of a work machine, and also to reduce service costs over the life cycle (maintenance work, downtime required for the work, dispatch of service personnel, etc.). [Brief description of the drawings]

[0010] [Figure 1] 1 is a block diagram illustrating a configuration of a management system according to an embodiment of the present invention. [Diagram 2] 1 is a side view showing a structure of a work machine in one embodiment of the present invention. [Diagram 3] 6 is a flowchart showing the processing contents of a computer of a management apparatus in one embodiment of the present invention. [Figure 4] FIG. 4 is a diagram illustrating a screen of a display of a management device according to an embodiment of the present invention. [Diagram 5] FIG. 11 is a block diagram illustrating a configuration of a management system according to a first modified example of the present invention. [Figure 6] FIG. 13 is a diagram illustrating a screen of a display unit of a management device in a second modified example of the present invention. [Figure 7] FIG. 13 is a diagram illustrating a screen of a display unit of a management device in a third modified example of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] An embodiment of the present invention will be described with reference to the drawings.

[0012] Fig. 1 is a block diagram showing the configuration of a management system in this embodiment. Fig. 2 is a side view showing the structure of a work machine in this embodiment.

[0013] The management system of this embodiment comprises a plurality of work machines 1 (for convenience, only one is shown in FIG. 1) and a management device 2 that manages the plurality of work machines 1.

[0014] The work machine 1 of this embodiment is a shovel, and includes a travellable lower traveling body 11, an upper rotating body 12 rotatably provided above the lower traveling body 11, and a working device 13 connected to the upper rotating body 12. The lower traveling body 11 travels using left and right traveling motors (hydraulic motors), and the upper rotating body 12 rotates using a swing motor (hydraulic motor).

[0015] The working device 13 includes a boom 14 rotatably connected to the upper rotating body 12, an arm 15 rotatably connected to the tip of the boom 14, and an attachment 16 rotatably connected to the tip of the arm 15. The boom 14 is rotated by a boom cylinder 17 (hydraulic cylinder), the arm 15 is rotated by an arm cylinder 18 (hydraulic cylinder), and the attachment 16 is rotated by an attachment cylinder 19 (hydraulic cylinder).

[0016] The attachment 16 is, for example, a bucket as standard equipment as shown in the drawing, but may be replaced with an optional grapple, breaker, or the like depending on the type of business, such as forestry or demolition, in which the work machine 1 is operated.

[0017] The upper rotating body 12 includes a rotating frame 20 forming a lower foundation structure, a cab 21 provided on the front left side of the rotating frame 20, and a machine room 22 provided in a portion of the rotating frame 20 other than the cab 21. Although not shown, the machine room 22 includes an engine, a hydraulic pump driven by the engine, and a plurality of directional control valves that respectively control the flow of pressure oil from the hydraulic pump to a plurality of actuators (more specifically, the above-mentioned traveling motor, the rotating motor, the boom cylinder 17, the arm cylinder 18, and the attachment cylinder 19). Although not shown, the cab 21 includes a driver's seat where the driver sits, and a plurality of operating devices that are operated by the driver to operate the plurality of directional control valves.

[0018] The work machine 1 is equipped with sensors 23 that detect state quantities related to the drive of a plurality of actuators, and a controller 25 that transmits the state quantities detected by the sensors 23 via a communication device 24. The controller 25 has, for example, a processor that executes control according to a program, and a memory that stores the program and data.

[0019] The sensors 23 include, as sensors for detecting state quantities related to the drive of the traveling motor, a sensor (not shown) for detecting the operation amount of the traveling operation device (or the pilot pressure output to the directional control valve corresponding thereto) and a pressure sensor (not shown) for detecting the discharge pressure of the hydraulic pump related to the drive of the traveling motor. The sensors 23 include, as sensors for detecting state quantities related to the drive of the swing motor, for example, an angle sensor (not shown) for detecting the swing angle of the upper swing body 12 relative to the lower traveling body 11, and a pressure sensor (not shown) for detecting one side pressure and opposite side pressure of the swing motor.

[0020] The sensors 23 include, as sensors for detecting state quantities related to the drive of the boom cylinder 17, an angle sensor (not shown) for detecting the rotation angle of the boom 14 relative to the upper rotating body 12, and a pressure sensor (not shown) for detecting the bottom side pressure and rod side pressure of the boom cylinder 17. The sensors 23 include, as sensors for detecting state quantities related to the drive of the arm cylinder 18, an angle sensor (not shown) for detecting the rotation angle of the arm 15 relative to the boom 14, and a pressure sensor (not shown) for detecting the bottom side pressure and rod side pressure of the arm cylinder 18. The sensors 23 include, as sensors for detecting state quantities related to the drive of the attachment cylinder 19, an angle sensor (not shown) for detecting the rotation angle of the attachment 16 relative to the arm 15, and a pressure sensor (not shown) for detecting the bottom side pressure and rod side pressure of the attachment cylinder 19.

[0021] The management device 2 of this embodiment comprises a computer 32 that receives and processes state quantities from multiple work machines 1 via a communication device 31, an input device 33, and a display device 34. The computer 32 has, for example, a processor that executes processing according to a program, and a memory that stores programs and data. The input device 33 is composed of, for example, a keyboard and a mouse, and the display device 34 is composed of, for example, a display.

[0022] The input device 33 cooperates with the display device 34 to make it possible to select the work machine 1 or at least one business type that is a candidate for the operation of the work machine 1.

[0023] The computer 32 has a function of judging whether or not the work machine 1 is suitable for operation in the business type selected by the input device 33, based on the usage ratios (described in detail below) of each of the multiple actuators in the work machine 1 selected by the input device 33 and the business type average usage ratio (described in detail below) in the business type selected by the input device 33, and outputting the judgment result. The computer 32 has, as its functional configuration, a data storage unit 35, a usage ratio calculation unit 36, a deviation calculation unit 37, and a judgment unit 38. The data storage unit 35 stores state quantities received from the work machine 1 and the business type average usage ratio acquired in advance for each combination of business type and actuator.

[0024] Next, the process contents of the computer 32 of the management device 2 of this embodiment will be described with reference to Fig. 3. Fig. 3 is a flow chart showing the process contents of the computer 32 of the management device 2 of this embodiment.

[0025] In step S1, the usage ratio calculation unit 36 ​​of the computer 32 acquires the accumulated load of each of the multiple actuators for the work machine 1 selected by the input unit 33. In this embodiment, the accumulated load is the accumulation of the load acting on the actuator while the actuator was in use.

[0026] More specifically, the cumulative load can be determined, for example, as an integrated value of the load determined based on the magnitude of the force (e.g., stress) acting on the actuator during operation and the time during which the force acts on the actuator. For example, when the actuator is a hydraulic cylinder or a hydraulic motor, the cumulative load can be calculated as the product of the discharge pressure of a hydraulic pump that supplies pressure oil to the cylinder or motor during operation and the operating time.

[0027] When a load is applied to an actuator, the load accumulates as mechanical fatigue in the actuator. For example, when the accumulated fatigue reaches the lifespan of the actuator's material, the actuator will suffer fatigue failure. Based on the accumulated load of the actuator, a predetermined reference value of the accumulated load is determined as the timing for maintenance, making it possible to create a maintenance plan.

[0028] A method of acquiring the cumulative load of each actuator will now be described. The usage ratio calculation unit 36 ​​of the computer 32 acquires the drive timing of the travel motor based on the amount of operation of the travel operating device stored in the data storage unit 35, for example, and calculates the load of the travel motor based on the discharge pressure of the hydraulic pump stored in the data storage unit 35. In other words, the load acting on the travel motor during operation is calculated based on the time during which the travel operating device was operated to operate the travel motor and the discharge pressure of the hydraulic pump that supplied pressure oil to the travel motor during that time. Then, the load of the travel motor is integrated to calculate the cumulative load indicating the cumulative load on the travel motor.

[0029] The usage ratio calculation unit 36 ​​of the computer 32, for example, acquires the drive timing of the swing motor based on the swing angle of the upper swing body 12 stored in the data storage unit 35, and calculates the load of the swing motor based on the one-side pressure and the other-side pressure of the swing motor stored in the data storage unit 35. In other words, it calculates the load acting on the swing motor during operation based on the time during which the upper swing body 12 has been swinging by the operation of the swing motor and the pressure of the pressure oil supplied to one or the other side of the swing motor during that time. Then, it calculates the cumulative load indicating the cumulative load on the swing motor by integrating the load on the swing motor.

[0030] The usage ratio calculation unit 36 ​​of the computer 32 acquires the drive timing of the boom cylinder 17 based on, for example, the rotation angle of the boom 14 stored in the data storage unit 35, and calculates the load of the boom cylinder 17 based on the bottom side pressure and rod side pressure of the boom cylinder 17 stored in the data storage unit 35. In other words, it calculates the load acting on the boom cylinder 17 during operation based on the time during which the boom 14 was rotated by the operation of the boom cylinder 17 and the pressure of pressure oil supplied to the bottom side or rod side of the boom cylinder 17 during that time. Then, by integrating the load of the boom cylinder 17, it calculates a cumulative load indicating the cumulative load on the boom cylinder 17.

[0031] The usage ratio calculation unit 36 ​​of the computer 32 acquires the drive timing of the arm cylinder 18 based on, for example, the change in the rotation angle of the arm 15 stored in the data storage unit 35, and calculates the load of the arm cylinder 18 based on the bottom side pressure and rod side pressure of the arm cylinder 18. In other words, it calculates the load acting on the arm cylinder 18 during operation based on the time during which the arm 15 was rotated by the operation of the arm cylinder 18 and the pressure of pressure oil supplied to the bottom side or rod side of the arm cylinder 18 during that time. Then, by integrating the load of the arm cylinder 18, it calculates a cumulative load indicating the cumulative load on the arm cylinder 18.

[0032] The usage ratio calculation unit 36 ​​of the computer 32 obtains the drive timing of the attachment cylinder 19 based on, for example, changes in the rotation angle of the attachment 16 stored in the data storage unit 35, and calculates the load on the attachment cylinder 19 based on the bottom side pressure and rod side pressure of the attachment cylinder 19 stored in the data storage unit 35. In other words, it calculates the load acting on the attachment cylinder 19 during operation based on the time during which the attachment 16 is rotated by the operation of the attachment cylinder 19 and the pressure of pressure oil supplied to the bottom side or rod side of the attachment cylinder 19 during that time. Then, by integrating the load on the attachment cylinder 19, it calculates a cumulative load indicating the cumulative load on the attachment cylinder 19.

[0033] Proceeding to step S2, the usage ratio calculation unit 36 ​​of the computer 32 calculates the usage rate for each of the multiple actuators, which is the ratio between the above-mentioned accumulated load and a predetermined reference value (more specifically, a value set for each actuator and serving as a guideline for maintenance or lifespan).

[0034] Proceeding to step S3, the usage ratio calculation unit 36 ​​of the computer 32 calculates a usage ratio for each of the multiple actuators, which is the ratio of the above usage to the total usage of all the actuators. For example, if the usage of the travel motor is 0.05, the usage of the swing motor is 0.08, the usage of the boom cylinder 17 is 0.08, the usage of the arm cylinder 18 is 0.30, and the usage of the attachment cylinder 19 is 0.30, then the total value is 0.81. In this case, the usage ratio of the travel motor is 0.06 (=0.05 / 0.081), the usage rate of the swing motor is 0.10 (=0.08 / 0.081), the usage rate of the boom cylinder 17 is 0.10 (=0.08 / 0.081), the usage rate of the arm cylinder 18 is 0.37 (=0.30 / 0.081), and the usage rate of the attachment cylinder 19 is 0.37 (=0.30 / 0.081).

[0035] Proceeding to step S4, the deviation degree calculation unit 37 of the computer 32 calculates the deviation degree for the business type selected by the input unit 33 by summing up the differences (absolute values) between the usage ratios of each of the multiple actuators and the business type average usage ratio for the business type selected by the input unit 33. For example, for the business type selected by the input unit 33, if the business type average usage ratio of the travel motor = 0.10, the business type average usage ratio of the swing motor = 0.15, the business type average usage ratio of the boom cylinder = 0.35, the business type average usage ratio of the arm cylinder = 0.30, and the business type average usage ratio of the attachment cylinder = 0.10, then the deviation degree = 0.68 (= |0.06-0.10| + |0.10-0.15| + |0.10-0.35| + |0.37-0.30| + |0.37-0.10|).

[0036] The business-type average usage ratio of each actuator indicates the average usage ratio of each actuator in a given business type, and more specifically, is the ratio between the business-type average usage of each actuator and the total value of the business-type average usage of all actuators. The business-type average usage of each actuator is set for each business type, and is the ratio between the average increase in the accumulated load of each actuator (average accumulated load) during a predetermined reference time when the work machine 1 is operated in that business type and a predetermined reference value.

[0037] Proceeding to step S5, the judgment unit 38 of the computer 32 judges whether the business format selected by the input unit 33 is suitable or not based on the deviation degree calculated by the deviation degree calculation unit 37, and outputs the judgment result. For example, in a case where multiple business formats are selected by the input unit 33, the judgment unit 38 of the computer 32 judges whether each of the multiple business formats is suitable or not based on whether multiple deviation degrees corresponding to each of the multiple business formats are larger than a predetermined threshold value. Alternatively, the judgment unit 38 judges that the business format corresponding to the largest deviation degree among the multiple business formats is suitable, and judges the other business formats to be unsuitable. The computer 32 causes the display unit 34 to display the judgment result of the judgment unit 38, etc.

[0038] The display device 34 displays, for example, a screen 41 shown in Fig. 4. The screen 41 has a machine information display area 42, a usage ratio display area 43, and a business type information display area 44. The machine information display area 42 displays the identification information (machine number) of the work machine 1 selected by the input device 33. The usage ratio display area 43 displays, in a radar chart, the usage ratios of a plurality of actuators calculated by the computer 32 for the work machine 1 selected by the input device 33. "TR", "SW", "BM", "AM", and "AT" in Fig. 4 are abbreviations for "travel motor", "swing motor", "boom cylinder", "arm cylinder", and "attachment cylinder". The business type information display area 44 displays the name of at least one business type selected by the input device 33 (for example, forestry or demolition work, etc.) and also displays the judgment result by the computer 32 as to whether the business type is suitable or not.

[0039] The manager selects the business type in which the work machine 1 is to be operated, based on the information displayed on the display 34. As a result, it is possible to prevent uneven usage of multiple actuators and reduce the number of maintenance operations for the work machine 1. In addition, it is possible to reduce service costs over the life cycle (maintenance work, downtime required for the work machine, dispatch of service personnel, etc.).

[0040] In the above embodiment, the computer 32 of the management device 2 uses a business type average usage rate acquired in advance, but this is not limited to the above. The computer 32 of the management device 2 may calculate a business type average usage rate based on state quantities and the like received from a plurality of work machines 1, and use the calculated business type average usage rate. The first modified example will be described with reference to Fig. 5. Fig. 5 is a block diagram showing the configuration of a management system in this modified example.

[0041] The work machine 1 of this modified example further includes a position measuring device 26 that measures the position of the work machine 1 based on a signal from a satellite, for example. The controller 25 of the work machine 1 transmits the state quantities detected by the sensors 23 via the communication device 24 in association with the position of the work machine 1 measured by the position measuring device 26.

[0042] The computer 32 of the management device 2 of this modified example further has, as a functional configuration, a business type average usage ratio calculation unit 39. The data storage unit 35 of the computer 32 stores the relationship between the position of the work machine 1 and the business type in which the work machine 1 is operated. The business type average usage ratio calculation unit 39 of the computer 32 acquires the business type corresponding to the position of each work machine 1 received from each work machine 1 based on the relationship stored in the data storage unit 35, and classifies the status quantities received from each work machine 1 according to the business type.

[0043] The business type average usage ratio calculation unit 39 of the computer 32 calculates the cumulative load increase of each of the actuators during the operation time in each business type based on the state quantities classified as described above. Then, for each combination of business type and actuator, the time during which the actuator was operated in that business type (hereinafter referred to as business type operation time) is integrated, and the cumulative load increase of the actuator is integrated. The average cumulative load is calculated by multiplying the integrated value of the cumulative load increase by the ratio between a predetermined reference time and the integrated value of the business type operation time.

[0044] The business type average usage ratio calculation unit 39 of the computer 32 calculates the business type average usage, which is the ratio between the average cumulative load and a predetermined reference value, for each combination of business type and actuator. Then, for each business type, the ratio between the business type average usage of each actuator and the total value of the business type average usage of all actuators is calculated as the business type average usage ratio of each actuator, and stored in the data storage unit 35.

[0045] The deviation degree calculation unit 37 of the computer 32 calculates the deviation degree for the business type selected by the input device 33 using the business type average usage rate calculated by the business type average usage rate calculation unit 39 and stored in the data storage unit 35 .

[0046] In this modified example, the same effect as in the above embodiment can be obtained. Moreover, in this modified example, the accuracy of the average business type usage ratio can be improved compared to the above embodiment, and the accuracy of determining whether or not an arbitrary business type is suitable can be improved.

[0047] In the above embodiment, an example has been described in which the computer 32 of the management device 2 displays on the display 34 the usage ratio of multiple actuators for the work machine 1 selected by the input device 33 and the determination result as to whether the business type selected by the input device 33 is suitable or not, but the present invention is not limited to this.

[0048] In the second modified example, the data storage unit 35 of the computer 32 stores the price of each actuator. The determination unit 38 of the computer 32 extracts, from among the multiple actuators for the work machine 1 selected by the input unit 33, the actuator whose usage ratio is greater than the business type average usage ratio and whose difference between the usage ratio and the business type average usage ratio is the largest (in other words, the actuator that has the greatest effect of suppressing usage). Then, the extracted actuator and its price are displayed in the business type information display area 44 on the screen 41 of the display unit 34 (see FIG. 6). This can help the manager make a decision to select a business type.

[0049] In the third modified example, the computer 32 calculates the deviation degree for each of a plurality of actions, selects the largest deviation degree among them, and displays the action corresponding to the selected deviation degree as a recommended action on the display 34. The details of this modified example will be described below.

[0050] In this modified example, the data storage unit 35 of the computer 32 stores the average operation usage ratio acquired in advance for each combination of business type and actuator. The average operation usage ratio of each actuator is the ratio between the average operation usage of each actuator and the total value of the average operation usage of all actuators. The average operation usage of each actuator is the ratio between the increase in the cumulative load of each actuator in a predetermined reference time when each operation of the work machine 1 is performed and a predetermined reference value.

[0051] The deviation degree calculation unit 37 of the computer 32 calculates the deviation degree for the loading operation by summing up the differences (absolute values) between the usage ratios of each of the multiple actuators and the average usage ratio for an operation, for example, a loading operation related to forestry, and also calculates the deviation degree for other operations by summing up the differences (absolute values) between the usage ratios of each of the multiple actuators and the average usage ratio for an operation, for example, a forestry operation.

[0052] The determination unit 38 of the computer 32 determines, for example, the magnitude relationship between the deviation degree for the loading action and the deviation degree for other actions. If the deviation degree for the loading action is greater than the deviation degree for other actions, the loading action is displayed as a recommended action in the business type information display area 44 on the screen 41 of the display 34 (see FIG. 7).

[0053] Alternatively, the deviation degree calculation unit 37 of the computer 32 calculates the deviation degree for the ground leveling operation by summing up the difference (absolute value) between the usage ratio of each of the multiple actuators and the average usage ratio for an operation, for example, ground leveling operation, related to the demolition work. Also, the deviation degree for other operations is calculated by summing up the difference (absolute value) between the usage ratio of each of the multiple actuators and the average usage ratio for an operation, for example, related to the demolition work, related to the business type.

[0054] The determination unit 38 of the computer 32 determines the magnitude relationship between the deviation degree for the flat ground leveling operation and the deviation degree for other operations, for example. If the deviation degree for the flat ground leveling operation is greater than the deviation degree for other operations, the flat ground leveling operation is displayed as a recommended operation in the business type information display area 44 on the screen 41 of the display 34 (see FIG. 7).

[0055] The user proactively performs the recommended actions displayed on the display 34. As a result, it is possible to prevent uneven usage of multiple actuators and reduce the number of maintenance operations for the work machine 1. It is also expected that the user will be able to avoid unexpected maintenance during operation due to uneven usage of the actuators.

[0056] In the above embodiment and modified example, the computer 32 of the management device 2 outputs the determination result as to whether or not the arbitrary business type is suitable by displaying on the display 34, but this is not limited to the above. The computer 32 of the management device 2 may output the determination result as to whether or not the arbitrary business type is suitable by, for example, audio from a speaker or printing from a printer.

[0057] Furthermore, in the above embodiment and modified example, the management device 2 has been described as managing a plurality of work machines 1, but this is not limiting, and the management device 2 may manage a single work machine 1.

[0058] Furthermore, in the above embodiment and modified example, the construction machine 1 has been described as a shovel, but this is not limited thereto, and the construction machine may be a construction machine other than a shovel as long as it has a plurality of actuators. [Explanation of symbols]

[0059] 1. Work Machinery 2 Management device 11 Undercarriage 12 Upper rotating body 13 Working Equipment 17 Boom cylinder 18 Arm Cylinder 19 Attachment cylinder

Claims

1. A work machine management device that manages a work machine having a plurality of actuators that drive a vehicle body including a work implement, obtaining an accumulated load for each of the actuators, the accumulated load being an accumulation of loads acting on the actuator while the actuator was in use; Calculating a usage rate for each of the actuators, the usage rate being a ratio between the cumulative load and a predetermined reference value; calculating a usage ratio for each of the plurality of actuators, the usage ratio being a ratio between the usage level and a total value of the usage levels of the plurality of actuators; acquiring a business type average usage ratio indicating an average usage ratio of each of the plurality of actuators in a given business type; A work machine management device characterized by determining whether or not it is suitable for the work machine to be operated in the given business type based on the usage ratio of each of the plurality of actuators and the business type average usage ratio, and outputting the determination result.

2. 2. The management device for a work machine according to claim 1, calculating an average cumulative load of each of the plurality of actuators based on an increase in the cumulative load of each of the plurality of actuators during the time that the work machine is operated in the arbitrary business mode; Calculating an average business use level for each of the actuators, the average use level being a ratio between the average cumulative load and the predetermined reference value; A work machine management device characterized by calculating, for each of the multiple actuators, the ratio of the business type average usage rate in the arbitrary business type to the sum of the business type average usage rates of the multiple actuators.

3. 2. The management device for a work machine according to claim 1, A work machine management device characterized in that it displays the usage ratio of the plurality of actuators and a judgment result as to whether or not the arbitrary business type is suitable.

4. The management device for a work machine according to claim 3, extracting an actuator from among the plurality of actuators, the actuator having the usage ratio greater than the business-type average usage ratio and having the largest difference between the usage ratio and the business-type average usage ratio; A work machine management device that displays the extracted actuators and their prices.

5. The management device for a work machine according to claim 3, calculating a deviation degree for one motion by summing up the differences between the usage ratios of the actuators and an average usage ratio for the one motion; calculating a deviation degree for the other operation by summing up the differences between the usage ratios of the actuators and an average usage ratio for the other operation; A work machine management device characterized by selecting the larger of the deviation degree for the one action and the deviation degree for the other action, and displaying the one action or the other action corresponding to the selected deviation degree as a recommended action.

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