Life prediction system and life prediction method

Abstract

To predict a life of a sealing material provided in a hydraulic device of a work machine.SOLUTION: A life prediction system that predicts a life of a first sealing material provided in a first hydraulic device of a first work machine includes a temperature sensor provided on the first work machine that detects a hydraulic oil temperature of the first hydraulic device, an operating state detection unit provided on the first work machine that detects an operating state of the first work machine, and a life prediction unit that predicts the life of the first sealing material based on the hydraulic oil temperature of the first hydraulic device and the operating state of the first work machine, and a correction coefficient calculated based on a hydraulic oil temperature history of second hydraulic devices provided on each of a plurality of second work machines and an operating history of the second work machine.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a lifespan prediction system and a lifespan prediction method. [Background technology]

[0002] In the technical field relating to prediction of the life span of a sealing material, a method for evaluating the life span of a rubber sealing material as disclosed in Patent Document 1 is known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-045524 A Summary of the Invention [Problem to be solved by the invention]

[0004] A seal is provided in a hydraulic device of a work machine. There is a demand for a technique for predicting the life of the seal provided in the hydraulic device of a work machine.

[0005] An object of the present disclosure is to predict the life of a sealing material provided in a hydraulic device of a work machine. [Means for solving the problem]

[0006] According to the present disclosure, there is provided a life prediction system for predicting a life of a first sealing material provided in a first hydraulic device of a first working machine, the life prediction system comprising: a temperature sensor provided on the first working machine for detecting a hydraulic oil temperature of the first hydraulic device; an operating state detection unit provided on the first working machine for detecting an operating state of the first working machine; and a life prediction unit for predicting the life of the first sealing material based on the hydraulic oil temperature of the first hydraulic device, the operating state of the first working machine, and a correction coefficient calculated based on the hydraulic oil temperature history of second hydraulic devices provided on each of a plurality of second working machines and the operating history of the second working machine. Effect of the Invention

[0007] According to the present disclosure, it is possible to predict the life of a sealing material provided in a hydraulic device of a work machine. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram illustrating a management system for a work machine according to an embodiment. [Diagram 2] FIG. 2 is a diagram illustrating a schematic diagram of a work machine according to an embodiment. [Diagram 3] FIG. 3 is a block diagram showing a work machine management system according to the embodiment. [Figure 4] FIG. 4 is a diagram for explaining a method for calculating a calculated life according to the embodiment. [Diagram 5] FIG. 5 is a diagram for explaining the relationship between the hydraulic oil temperature and the sealing material temperature according to the embodiment. [Figure 6] FIG. 6 is a diagram showing the relationship between the measured values ​​and the calculated values ​​of the life of the sealing material according to the embodiment. [Figure 7] FIG. 7 is a diagram showing the relationship between the first correction coefficient and the value indicating the operating status according to the embodiment. [Figure 8] FIG. 8 is a diagram showing the relationship between the second correction coefficient and the value indicating the operation frequency according to the embodiment. [Figure 9] FIG. 9 is a flowchart showing a method for predicting a life span of a sealing material according to an embodiment. [Figure 10] FIG. 10 is a block diagram illustrating a computer system according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings, but the present disclosure is not limited to the embodiment. The components of the embodiments described below can be appropriately combined. In addition, some components may not be used.

[0010] [Management system] Fig. 1 is a diagram that illustrates a management system 1 for a work machine 2 according to an embodiment. The work machine 2 operates at a work site. In the embodiment, the work machine 2 is a hydraulic excavator. The work machine 2 has a running body having tracks, a rotating body supported on the running body, and a work implement supported on the rotating body. The work implement has a boom connected to the rotating body, an arm connected to the boom, and a bucket connected to the arm.

[0011] The management system 1 includes a server 3 that collects operation data indicating the operating status of the work machines 2. The server 3 is disposed outside the work machines 2. The server 3 is disposed in a remote location from the work site. The server 3 collects operation data from each of the multiple work machines 2.

[0012] The work machine 2 has a controller 4. The controller 4 transmits operation data of the work machine 2 to the server 3 via a communication system 5. The communication system 5 includes at least one of the Internet, a mobile phone communication network, a satellite communication network, and a local area network (LAN).

[0013] [Work machinery] Fig. 2 is a diagram illustrating a schematic diagram of a work machine 2 according to an embodiment. As shown in Fig. 2, the work machine 2 has a controller 4 and a hydraulic system 6. The hydraulic system 6 has a plurality of hydraulic devices and a tank 12. The hydraulic devices of the hydraulic system 6 include a hydraulic pump 7, a valve 8, a hydraulic motor 9, a hydraulic motor 10, and a hydraulic cylinder 11. The work machine 2 also has an engine 13, a lever 14, a temperature sensor 15, and an operating state detection unit 16.

[0014] The hydraulic pump 7 has a suction port for sucking in hydraulic oil contained in a tank 12, and a discharge port for discharging the hydraulic oil. The hydraulic oil discharged from the hydraulic pump 7 is supplied to each of the hydraulic motor 9, the hydraulic motor 10, and the hydraulic cylinder 11 via a valve 8. One of the hydraulic motor 9 and the hydraulic motor 10 is a travel motor for operating a traveling body of the work machine 2. The other of the hydraulic motor 9 and the hydraulic motor 10 is a swing motor for operating a swing body of the work machine 2. The hydraulic cylinder 11 is a work machine cylinder for operating a work machine of the work machine 2.

[0015] The engine 13 is a power source of the work machine 2. The engine 13 generates power to drive the hydraulic pump 7.

[0016] The levers 14 are operated by an operator aboard the work machine 2. The levers 14 are operated to operate the work machine 2. The levers 14 include a working lever that is operated to operate the work equipment and the rotating body, and a traveling lever that is operated to operate the traveling body.

[0017] The temperature sensor 15 detects the temperature of hydraulic oil in the hydraulic equipment. The detection data from the temperature sensor 15 is output to the controller 4. The operating state detection unit 16 includes a plurality of sensors that detect the operating state of the work machine 2. The detection data from the operating state detection unit 16 is output to the controller 4. The operating state of the work machine 2 includes a working state in which the work machine 2 is performing work, and a stopped state in which it is not performing work.

[0018] The operating state of the work machine 2 includes the drive state of the engine 13 and the operation state of the lever 14. The drive state of the engine 13 includes the number of times the engine 13 is turned on, the number of times the engine 13 is turned off, the time interval from one turn on of the engine 13 to the next turn on, and the time interval from one off of the engine 13 to the next turn off. The operation state of the lever 14 includes the number of times the lever 14 is turned on, the number of times the lever 14 is turned off, the time interval from one turn on of the lever 14 to the next turn on, the time interval from one off of the lever 14 to the next turn off, and a lever output value indicating the amount of operation of the lever 14.

[0019] The operating status of the work machine 2 also includes the actual operating hours per day of the work machine 2, the fuel consumption of the work machine 2, the excavation time during which the work machine 2 excavates the excavation target with its work implement, and the traveling time during which the work machine 2 travels.

[0020] The operation data of the work machine 2 also includes the temperature of hydraulic oil in the hydraulic equipment. The temperature sensor 15 may be regarded as a part of the operation state detection unit 16.

[0021] The controller 4 transmits to the server 3 detection data from a temperature sensor 15 that indicates the hydraulic oil temperature and detection data from an operating state detection unit 16 that indicates the operating state of the work machine 2 .

[0022] The hydraulic equipment of the work machine 2 has sealing materials. That is, the hydraulic pump 7, the valve 8, the hydraulic motor 9, the hydraulic motor 10, and the hydraulic cylinder 11 are each provided with a sealing material. The sealing material is made of rubber. Examples of the sealing material include an O-ring or a rubber sheet. The sealing material prevents the hydraulic oil from leaking from the hydraulic equipment.

[0023] The sealing material is thermally hardened due to, for example, the heat of the hydraulic oil. When the sealing material is thermally hardened and reaches the end of its life, the sealing performance of the sealing material deteriorates, and hydraulic oil may leak from the hydraulic equipment. In order to prevent hydraulic oil from leaking from the hydraulic equipment, it is necessary to replace the sealing material before the end of its life. On the other hand, if the sealing material is replaced even though there is still some margin in its life, replacement costs may be incurred and the operation rate of the work machine 2 may decrease due to the replacement work. There is a demand for a technology to predict the life of the sealing material provided in the hydraulic equipment of the work machine 2 so that the sealing material provided in the hydraulic equipment of the work machine 2 is replaced at the appropriate time. By predicting the life of the sealing material, the sealing material can be replaced at the appropriate time.

[0024] In the embodiment, the management system 1 includes a life prediction system for a seal material provided in a hydraulic device. The management system 1 predicts the life of the seal material based on the hydraulic oil temperature. In the embodiment, the server 3 predicts the life of the seal material based on the hydraulic oil temperature detected by the temperature sensor 15.

[0025] The consumed life of the sealing material may be a consumed life time or a consumed life ratio. When the consumed life of the sealing material is defined as a consumed life time, the sealing material is determined to have reached the end of its life when the consumed life time exceeds a predetermined life time. When the consumed life of the sealing material is defined as a consumed life ratio, the sealing material is determined to have reached the end of its life when the consumed life ratio exceeds a predetermined life ratio.

[0026] In an embodiment, the management system 1 predicts the life of a sealing material provided in a hydraulic equipment of a first work machine 2 based on the hydraulic oil temperature of the hydraulic equipment of the first work machine 2 and the operating state of the first work machine 2, and the hydraulic oil temperature of the hydraulic equipment of a second work machine 2 different from the first work machine 2 and the operating state of the second work machine 2. In other words, the management system 1 predicts the life of a sealing material provided in a hydraulic equipment of the first work machine 2 based on the hydraulic oil temperature of the hydraulic equipment of the first work machine 2 and the operating state of the first work machine 2, and the hydraulic oil temperature of the hydraulic equipment of the second work machine 2 and the operating state of the second work machine 2.

[0027] In the following description, the first working machine 2 having a sealing material whose lifespan is predicted will be referred to as the first working machine 2A, and the second working machine 2 different from the first working machine 2A will be referred to as the second working machine 2B. Additionally, the hydraulic equipment of the first working machine 2A will be referred to as the first hydraulic equipment, and the sealing material provided on the first hydraulic equipment will be referred to as the first sealing material. The hydraulic equipment of the second working machine 2B will be referred to as the second hydraulic equipment, and the sealing material provided on the second hydraulic equipment will be referred to as the second sealing material.

[0028] The first sealant of the first working machine 2A is a sealant whose life span is to be predicted. The second sealant of the second working machine 2B is a sealant after it has actually reached the end of its life span. In predicting the life span of the first sealant, the actual life span indicating the actual life span of the second sealant is known data. The hydraulic oil temperature of the second hydraulic device is detected by a temperature sensor 15 provided on the second working machine 2B. The operating state of the second working machine 2B is detected by an operating state detection unit 16 provided on the second working machine 2B. In predicting the life span of the first sealant, the hydraulic oil temperature of the second hydraulic device is known data, and the operating state of the second working machine 2B is known data. In the following description, the hydraulic oil temperature of the second hydraulic device is appropriately referred to as the hydraulic oil temperature history, and the operating state of the second working machine 2B is appropriately referred to as the operating history.

[0029] The number of second work machines 2B may be one or more. In the embodiment, the number of second work machines 2B is assumed to be multiple.

[0030] [Lifespan prediction system] Fig. 3 is a functional block diagram showing a management system 1 for a work machine 2 according to an embodiment. As shown in Fig. 3, an output device 20 is connected to a server 3. The output device 20 outputs output data. Examples of the output device 20 include a display device or an audio output device. The display device includes a flat panel display such as a liquid crystal display or an organic EL display. The display device outputs display data. The audio output device outputs audio data.

[0031] As shown in FIG. 3, each of the first work machine 2A and the second work machine 2B has a controller 4, a temperature sensor 15, and an operating state detection unit 16.

[0032] The hydraulic oil temperature of the first hydraulic device detected by the temperature sensor 15 of the first work machine 2A is transmitted to the server 3 via the communication system 5. First operation data indicating the operation state of the first work machine 2A detected by the operation state detection unit 16 of the first work machine 2A is transmitted to the server 3 via the communication system 5.

[0033] The hydraulic oil temperature (hydraulic oil temperature history) of the second hydraulic equipment detected by the temperature sensor 15 of the second work machine 2B is transmitted to the server 3 via the communication system 5. Second operation data indicating the operation state (operation history) of the second work machine 2B detected by the operation state detection unit 16 of the second work machine 2B is transmitted to the server 3 via the communication system 5.

[0034] The server 3 includes a computer system. The server 3 has at least one processor and a main memory that stores a computer program executed by the processor. The server 3 has a life prediction unit 30 and a correction coefficient calculation unit 40. The life prediction unit 30 predicts the life of the first sealant based on the hydraulic oil temperature of the first hydraulic device and the operating state of the first work machine 2A, and a correction coefficient calculated based on the hydraulic oil temperature history of the second hydraulic device and the operating history of the second work machine 2B. The correction coefficient calculation unit 40 calculates the correction coefficient based on the hydraulic oil temperature history of the second hydraulic device and the operating history of the second work machine 2B.

[0035] The life prediction unit 30 includes an operation data acquisition unit 31 , a calculated life calculation unit 32 , a corrected life calculation unit 33 , a correction coefficient storage unit 34 , a life threshold storage unit 35 , a comparison unit 36 ​​, and a notification unit 37 .

[0036] The operation data acquisition unit 31 acquires the hydraulic oil temperature of the first hydraulic device and the operation state of the first work machine 2A transmitted from the controller 4 of the first work machine 2A.

[0037] The calculated life calculation unit 32 calculates a calculated life of a first seal material provided in the first hydraulic device based on the hydraulic oil temperature of the first hydraulic device. The calculated life calculation unit 32 calculates the calculated life based on a statistical value of the hydraulic oil temperature of the first hydraulic device and an Arrhenius plot related to the first seal material.

[0038] FIG. 4 is a diagram for explaining a method of calculating a calculated life according to an embodiment. The calculated life calculation unit 32 generates a hydraulic oil temperature histogram as a statistical value of the hydraulic oil temperature based on the detection data of the temperature sensor 15 of the first work machine 2A. The hydraulic oil temperature histogram shows the relationship between a plurality of hydraulic oil temperatures (hydraulic oil temperature zones) and the time that each hydraulic oil temperature is maintained. In addition, an Arrhenius plot related to the sealing material is created in advance. The calculated life calculation unit 32 generates an approximation line of the Arrhenius plot.

[0039] p n indicates the cumulative usage time of the seal material in the nth hydraulic oil temperature zone. In FIG. 4, the cumulative usage time p3 in the third hydraulic oil temperature zone and the cumulative usage time p4 in the fourth hydraulic oil temperature zone are illustrated. n indicates the estimated life time of the seal material in the nth hydraulic oil temperature zone. In Fig. 4, an estimated life time q3 in the third hydraulic oil temperature zone and an estimated life time q4 in the fourth hydraulic oil temperature zone are illustrated.

[0040] r n indicates the calculated life consumption rate of the seal material in the hydraulic oil temperature zone n. In the example shown in FIG. 4, the calculated life consumption rate r n The cumulative usage time p of each of the multiple hydraulic oil temperature zones is calculated. n p1, p2, …p 12 The estimated life time of each of the multiple hydraulic oil temperature ranges q n Let q1, q2, …q 12 The calculated life consumption rate r for each of the multiple hydraulic oil temperature ranges is n r1, r2, …r 12 In this case, the following equation (1) holds.

[0041]

number

[0042] The total calculated life consumption rate of the sealing material calculated by the calculated life calculation unit 32 is expressed by the following formula (2). The time when the total calculated life consumption rate calculated by formula (2) becomes 100% is defined as the calculated life of the sealing material.

[0043]

number

[0044] The corrected life calculation unit 33 corrects the calculated life of the first seal material expressed by equation (2) with a correction coefficient to calculate the corrected life. In the embodiment, the life of the first seal material is the corrected life calculated by the corrected life calculation unit 33.

[0045] The calculated lifespan and the actual lifespan (real lifespan) of the sealing material (first sealing material) may not match. The following first, second, and third factors are considered to be the reasons why the calculated lifespan and the actual lifespan of the sealing material do not match.

[0046] 5 is a diagram for explaining the relationship between the hydraulic oil temperature and the sealing material temperature according to the embodiment. As a first factor, the temperature sensor 15 directly detects the hydraulic oil temperature but does not directly detect the sealing material temperature. Therefore, there is a possibility that a difference occurs between the hydraulic oil temperature and the sealing material temperature at the detection position of the temperature sensor 15, or a difference occurs between the change in the hydraulic oil temperature and the change in the sealing material temperature as shown in FIG. 5.

[0047] The second factor is that when the flow state of hydraulic oil in hydraulic equipment changes between lever on and lever off, there is a possibility that a difference will occur in the way the hydraulic oil temperature changes and the way the sealant temperature changes, as shown in Figure 5.

[0048] A third factor is that the temperature sensor 15 detects the hydraulic oil temperature when the engine is on (key is on), but does not detect the hydraulic oil temperature when the engine is off (key is off). That is, although the hydraulic oil temperature is not detected when the engine is off, for example, immediately after the transition from engine on to engine off, the seal continues to be in contact with high-temperature hydraulic oil, and the seal may be thermally hardened.

[0049] In the embodiment, the discrepancy between the calculated life and the actual life of the sealing material due to the above-mentioned factors is eliminated by using a correction coefficient. The corrected life calculation unit 33 can calculate a corrected life close to the actual life by correcting the calculated life with the correction coefficient.

[0050] The correction coefficient will be described below. In this embodiment, the correction coefficient is calculated in a correction coefficient calculation unit 40. The correction coefficient calculation unit 40 calculates the correction coefficient based on the hydraulic oil temperature history of the second hydraulic equipment of the second work machine 2B and the operation history of the second work machine 2B. The correction coefficient storage unit 34 stores the correction coefficient calculated by the correction coefficient calculation unit 40. The corrected life calculation unit 33 corrects the calculated life with the correction coefficient stored in the correction coefficient storage unit 34.

[0051] In calculating the correction coefficient, the hydraulic oil temperature of the second hydraulic device and the operation history of the second work machine 2B are used. The controller 4 or server 3 of the second work machine 2B holds actual life data indicating the actual life of the second sealant. In the embodiment, the calculated life of the second sealant provided in the second work machine 2B used in calculating the correction coefficient is calculated in the same manner as the calculated life of the first work machine 2A. That is, the correction coefficient calculation unit 40 calculates the calculated life of the second sealant based on the statistical values ​​of the hydraulic oil temperature history of the second hydraulic device and an Arrhenius plot related to the second sealant. In the embodiment, each of the first operation data indicating the operation state of the first work machine 2A and the second operation data indicating the operation history of the second work machine 2B used in calculating the correction coefficient is calculated using a value a indicating the operation status. n and value b indicating the operation frequency n Includes the value a indicating the operating statusn contains values ​​for regular operation. Value b indicates the operation frequency n Includes the frequency with which the content of operations changes.

[0052] Value indicating operation status a n Examples of these include the actual operating time a1 per day of the work machine 2 (the first work machine 2A and the second work machine 2B), the fuel consumption a2 of the work machine 2, the excavation time a3 that the work machine 2 uses its work equipment to excavate the excavation target, and the traveling time a4 that the work machine 2 travels.

[0053] Value b indicating operation frequency n Examples of these include the number of times b1 the engine 13 of the work machine 2 (first work machine 2A and second work machine 2B) is turned on, the number of times b2 the engine 13 of the work machine 2 is turned off, the time interval b3 from on to off of the engine 13 of the work machine 2, the time interval b4 from off to on of the engine 13 of the work machine 2, the number of times b5 the lever 14 of the work machine 2 is turned on, the number of times b6 the lever 14 of the work machine 2 is turned off, the time interval b7 from on to off of the lever 14 of the work machine 2, the time interval b8 from off to on of the lever 14 of the work machine 2, and a lever output value b9 indicating the amount of operation of the lever 14 of the work machine 2.

[0054] First correction factor α n is expressed by the following equation (3). The second correction coefficient β n is expressed by the following equation (4). In equation (3), C1 n is a constant, and A is a constant. In equation (4), C2 n , C3 n is a constant.

[0055]

number

[0056]

number

[0057] FIG. 6 shows the actual measured value y of the life of the sealing material according to the embodiment.i and the calculated value x i 6 is a graph showing the relationship between the actual measured values ​​y of the sealant life in each of the first to tenth second working machines 2B. i and the calculated value x i As an example, the actual measurement value y1 is a relationship between the actual measurement value y i The calculated value x1 is the calculated value x for the first machine of the second work machine 2B. i The actual measurement value y2 is the actual measurement value y i and the calculated value x2 is the calculated value x for the second machine of the second work machine 2B. i It is.

[0058] Actual measured value of seal life y i is the actual time from when a new (good) seal is installed in a hydraulic device until it reaches the end of its life. The calculated value of the seal life x i is the calculated time from when a new seal is installed in a hydraulic device to when it reaches the end of its life, which is calculated based on the above-mentioned calculated life. i may be considered as the actual life. The calculated value of the seal life x i The actual value y of the sealant life can be considered as the calculated life due to the above-mentioned first, second, and third factors, as shown in FIG. i (actual life) and calculated value x i (Calculated lifespan) does not match.

[0059] In the embodiment, the correction coefficient calculation unit 40 calculates the actual measured value y i and the calculated value x i The correction coefficient calculation unit 40 calculates a correction coefficient α based on the difference between the first correction coefficient α and the second correction coefficient α so that the following formula (5) is minimized: n Constant C1 for n The correction coefficient calculation unit 40 determines the second correction coefficient β so that the following formula (5) is minimized: n The constant C2 n and constant C3 n Determine.

[0060]

number

[0061] FIG. 7 shows the first correction coefficient α n and the value a indicating the operating status n 8 is a graph showing the relationship between the second correction coefficient β n and the value b indicating the operation frequency n FIG.

[0062] As shown in Figure 7, the constant C1 n By defining the value a, which indicates the operating status, n Based on the first correction coefficient α n Each of the points shown in FIG. 7 is a value a n When y is one of the values ​​(a1, a2, a3, …), i =x i ×α n In other words, this is a value where the calculated value of the sealant life after correction (corrected life) coincides with the actual measured value of the sealant life (actual life).

[0063] As shown in Figure 8, the constant C2 n and constant C3 n By defining the value b, which indicates the operation frequency, n Based on the second correction factor β n Each of the points shown in FIG. 8 is a value b n When y is one of the values ​​(b1, b2, b3, …), i =x i ×β n In other words, this is a value where the calculated value of the sealant life after correction (corrected life) coincides with the actual measured value of the sealant life (actual life).

[0064] In this way, the correction coefficient calculation unit 40 calculates the calculated life of the second sealing material provided in the second hydraulic equipment based on the hydraulic oil temperature history of the second hydraulic equipment, and calculates a correction coefficient based on the calculated life of the second sealing material, the actual life (actual life) of the second sealing material, and the operating history of the second work machine 2B.

[0065] The correction coefficient has been described above. The corrected life calculation unit 33 corrects the calculated life with the correction coefficient to calculate the corrected life. The corrected life calculation unit 33 calculates the corrected life by using the first correction coefficient α n and the second correction coefficient β n The corrected life calculation unit 33 calculates the corrected life using one or both of the first correction coefficients α n Among them, one first correction coefficient α n Alternatively, a plurality of first correction coefficients α n The corrected life calculation unit 33 may use a plurality of second correction coefficients β n Among them, one second correction coefficient β n Alternatively, a plurality of second correction coefficients β n When the calculated life is La and the corrected life is Lb, the corrected life calculation unit 33 may calculate the corrected life Lb based on at least one of the following formulas (6), (7), and (8).

[0066]

number

[0067]

number

[0068]

number

[0069] The comparator 36 compares the corrected life calculated by the corrected life calculation unit 33 with a predetermined life threshold value. The life threshold value is stored in advance in the life threshold value storage unit 35.

[0070] The notification unit 37 notifies the output device 20 of the comparison result of the comparison unit 36. If the corrected life exceeds the life threshold value, the notification unit 37 causes the output device 20 to output notification data recommending replacement of the sealing material.

[0071] [Life expectancy prediction method] Fig. 9 is a flowchart showing a method for predicting the life of a sealing material according to an embodiment. In the example shown in Fig. 9, the correction coefficient is calculated in advance based on the hydraulic oil temperature history of the second hydraulic device and the operation history of the second work machine 2B, and is stored in advance in the correction coefficient storage unit 34.

[0072] The operation data acquisition unit 31 acquires the hydraulic oil temperature of the first hydraulic device and the operation state of the first work machine 2A from the first work machine 2A (step S1).

[0073] The calculated life calculation unit 32 calculates the calculated life of the first sealant based on the statistical values ​​of the hydraulic oil temperature of the first hydraulic device of the first working machine 2A and the Arrhenius plot for the first sealant (step S2).

[0074] The corrected life calculation unit 33 corrects the calculated life calculated in step S2 with the correction coefficient stored in the correction coefficient storage unit 34 to calculate a corrected life (step S3).

[0075] The comparison unit 36 ​​determines whether the corrected life calculated in step S3 exceeds the life threshold value stored in the life threshold value storage unit 35 (step S4).

[0076] In step S4, if it is determined that the corrected life exceeds the life threshold value (step S4: Yes), the notification unit 37 causes the output device 20 to output notification data recommending replacement of the sealing material (step S5).

[0077] In step S4, if it is determined that the corrected life is equal to or less than the life threshold value (step S4: No), the process returns to step S1.

[0078] [Computer System] FIG. 10 is a block diagram showing a computer system 1000 according to an embodiment. Each of the above-mentioned server 3 and controller 4 includes a computer system 1000. The computer system 1000 includes a processor 1001 such as a CPU (Central Processing Unit), a main memory 1002 including a non-volatile memory such as a ROM (Read Only Memory) and a volatile memory such as a RAM (Random Access Memory), a storage 1003, and an interface 1004 including an input / output circuit. The functions of the above-mentioned server 3 and controller 4 are stored in the storage 1003 as computer programs. The processor 1001 reads the computer program from the storage 1003, loads it in the main memory 1002, and executes the above-mentioned processing according to the program. The computer program may be distributed to the computer system 1000 via a network.

[0079] The computer program can predict the life of the sealing material provided in the hydraulic equipment of the first work machine 2A according to the above-described embodiment. The computer system can execute the following: detect the hydraulic oil temperature of the first hydraulic equipment of the first work machine 2A, detect the operating state of the first work machine 2A, calculate a correction coefficient based on the hydraulic oil temperature history of the second hydraulic equipment provided in each of the multiple second work machines 2B and the operating history of the second work machine 2B, and predict the life of the first sealing material based on the hydraulic oil temperature of the first hydraulic equipment, the operating state of the first work machine 2A, and the correction coefficient.

[0080] [effect] As described above, according to the embodiment, the management system 1 can predict the life of the sealing material provided in the hydraulic equipment of the work machine 2. By predicting the life of the sealing material, it is possible to replace the sealing material at an appropriate time.

[0081] [Other embodiments] In the above-described embodiment, the life prediction unit 30 is provided in the server 3 external to the work machine 2. The life prediction unit 30 may also be provided inside the work machine 2. The controller 4 of the work machine 2 may have the function of the life prediction unit 30.

[0082] In the above embodiment, the work machine 2 is a hydraulic excavator. The work machine 2 may be any work machine having hydraulic equipment. Examples of the work machine 2 include a bulldozer, a wheel loader, and a dump truck.

[0083] In the above embodiment, the power source of the work machine 2 is the engine 13. The power source of the work machine 2 may be an electric motor driven by a battery or a fuel cell. The hydraulic equipment may be driven by an electric motor.

[0084] In the above-described embodiment, in predicting the life span of the first sealing material, the second operation data indicating the operation history of the second working machine 2B is known data, and the correction coefficient is calculated based on the second operation data. In calculating the correction coefficient, the second operation data may be added as needed. The correction coefficient calculation unit 40 may newly calculate the correction coefficient based on the newly added second operation data, and update the correction coefficient storage unit 34. [Explanation of symbols]

[0085] 1...management system, 2...work machine, 2A...first work machine, 2B...second work machine, 3...server, 4...controller, 5...communication system, 6...hydraulic system, 7...hydraulic pump, 8...valve, 9...hydraulic motor, 10...hydraulic motor, 11...hydraulic cylinder, 12...tank, 13...engine, 14...lever, 15...temperature sensor, 16...operation status detection unit, 20...output device, 30...life prediction unit, 31...operation data acquisition unit, 32...calculated life calculation unit, 33...corrected life calculation unit, 34...correction coefficient memory unit, 35...life threshold memory unit, 36...comparison unit, 37...notification unit, 40...correction coefficient calculation unit, 1000...computer system, 1001...processor, 1002...main memory, 1003...storage, 1004...interface.

Claims

1. A life prediction system for predicting a life of a first seal material provided in a first hydraulic device of a first work machine, a temperature sensor provided in the first work machine for detecting a hydraulic oil temperature of the first hydraulic device; an operating condition detection unit provided in the first work machine, the operating condition detection unit detecting an operating condition of the first work machine; a life prediction unit that predicts a life of the first sealant based on a hydraulic oil temperature of the first hydraulic device and an operating state of the first work machine, and a correction coefficient calculated based on a hydraulic oil temperature history of a second hydraulic device provided on each of a plurality of second work machines and an operating history of the second work machine. Lifespan prediction system.

2. The life prediction unit is a calculated life calculation unit that calculates a calculated life of the first sealing material based on a hydraulic oil temperature of the first hydraulic device; a corrected life calculation unit that corrects a calculated life of the first sealing material by the correction coefficient to calculate a corrected life, The life of the first sealant includes the corrected life. The life prediction system according to claim 1 .

3. the calculated life calculation unit calculates a calculated life of the first sealing material based on a statistical value of a hydraulic oil temperature of the first hydraulic device and an Arrhenius plot related to the first sealing material; The life prediction system according to claim 2 .

4. a correction coefficient calculation unit for calculating the correction coefficient, the correction coefficient calculation unit calculates a calculated life of a second seal material provided in the second hydraulic device based on a hydraulic oil temperature history of the second hydraulic device; calculating the correction coefficient based on a calculated life of the second sealing material, an actual life of the second sealing material, and an operation history of the second work machine; The life prediction system according to claim 1 .

5. the correction coefficient calculation unit calculates a calculated life of the second sealing material based on a statistical value of a hydraulic oil temperature history of the second hydraulic device and an Arrhenius plot related to the second sealing material. The life prediction system according to claim 4 .

6. The life prediction unit is a correction coefficient storage unit that stores a correction coefficient calculated based on a hydraulic oil temperature history of the second hydraulic device and an operation history of the second work machine; The life prediction system according to claim 1 .

7. a correction coefficient calculation unit that calculates the correction coefficient based on a hydraulic oil temperature history of the second hydraulic device and an operation history of the second work machine, the correction coefficient storage unit stores the correction coefficient calculated by the correction coefficient calculation unit; The life prediction system according to claim 6.

8. The life prediction unit is a comparison unit that compares the corrected life with a predetermined life threshold value; A notification unit that notifies an output device of a comparison result of the comparison unit. The life prediction system according to claim 2 .

9. the life prediction unit is disposed outside the first work machine and the second work machine. The life prediction system according to claim 1 .

10. each of first operation data indicating an operation state of the first work machine and second operation data indicating an operation history of the second work machine includes a value indicating an operation status and a value indicating an operation frequency; The life prediction system according to claim 1 .

11. The value indicating the operating status includes at least one of an actual operating time of each of the first work machine and the second work machine, a fuel consumption amount of each of the first work machine and the second work machine, an excavation time during which each of the first work machine and the second work machine excavates an excavation target with a work implement, and a traveling time during which each of the first work machine and the second work machine travels. The life prediction system according to claim 10.

12. The value indicating the operation frequency includes at least one of the following: the number of times that the engines of the first work machine and the second work machine are turned on; the number of times that the engines of the first work machine and the second work machine are turned off; the time interval from on to off of the engines of the first work machine and the second work machine; the time interval from off to on of the engines of the first work machine and the second work machine; the number of times that a lever operated to operate each of the first work machine and the second work machine is turned on; the number of times that a lever of each of the first work machine and the second work machine is turned off; the time interval from on to off of the levers of the first work machine and the second work machine; the time interval from off to on of the levers of the first work machine and the second work machine; and a lever output value indicating the amount of operation of the lever of each of the first work machine and the second work machine. The life prediction system according to claim 10.

13. A method for predicting a life of a first seal material provided in a first hydraulic device of a first work machine, comprising the steps of: Detecting a hydraulic oil temperature of the first hydraulic device; Detecting an operating state of the first work machine; calculating a correction coefficient based on a hydraulic oil temperature history of a second hydraulic device provided in each of a plurality of second work machines and an operation history of the second work machines; predicting a life of the first sealing material based on a hydraulic oil temperature of the first hydraulic device, an operating state of the first work machine, and the correction coefficient. Life expectancy prediction methods.

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