Service life predicting system and service life predicting method

Abstract

This service life predicting system for predicting the service life of a first sealing material provided in a first hydraulic device of a first working machine comprises: a temperature sensor which is provided in the first working machine to detect the hydraulic oil temperature of the first hydraulic device; an operating state detecting unit which is provided in the first working machine to detect an operating state of the first working machine; and a service life predicting unit for predicting the service life of the first sealing material on the basis of the hydraulic oil temperature of the first hydraulic device, the operating state of the first working machine, and a correction factor calculated on the basis of the hydraulic oil temperature histories of second hydraulic devices provided in each of a plurality of second working machines and operation histories of the second working machines.

Description

Life prediction system and life prediction method

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

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

[0003] JP 2015-045524 A

[0004] Seals are provided in hydraulic equipment of work machines. There is a demand for a technique for predicting the life of seals provided in hydraulic equipment of work machines.

[0005] An object of the present disclosure is to predict the life of a seal material provided in a hydraulic device of a work machine.

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

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

[0008] FIG. 1 is a diagram schematically showing a management system for a work machine according to an embodiment. FIG. 2 is a diagram schematically showing a work machine according to an embodiment. FIG. 3 is a block diagram showing a management system for a work machine according to an embodiment. FIG. 4 is a diagram for explaining a method for calculating a calculated life according to an embodiment. FIG. 5 is a diagram for explaining the relationship between hydraulic oil temperature and sealing material temperature according to an embodiment. FIG. 6 is a diagram showing the relationship between an actually measured value and a calculated value of the life of a sealing material according to an embodiment. FIG. 7 is a diagram showing the relationship between a first correction coefficient and a value indicating an operating status according to an embodiment. FIG. 8 is a diagram showing the relationship between a second correction coefficient and a value indicating an operating frequency according to an embodiment. FIG. 9 is a flowchart showing a method for predicting the life of a sealing material according to an embodiment. FIG. 10 is a block diagram showing a computer system according to an embodiment.

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

[0010] [Management System] Figure 1 is a diagram that schematically shows a management system 1 for a work machine 2 according to an embodiment. The work machine 2 operates at a work site. In this embodiment, the work machine 2 is a hydraulic excavator. The work machine 2 has a running body with 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 located outside the work machines 2. The server 3 is located 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] [Working Machine] Figure 2 is a diagram that schematically shows a working machine 2 according to an embodiment. As shown in Figure 2, the working 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 working 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 that sucks in hydraulic oil stored in a tank 12, and a discharge port that discharges the hydraulic oil. The hydraulic oil discharged from the hydraulic pump 7 is supplied to the hydraulic motor 9, hydraulic motor 10, and hydraulic cylinder 11 via a valve 8. One of the hydraulic motors 9 and 10 is a travel motor that operates the traveling body of the work machine 2. The other of the hydraulic motor 9 and 10 is a swing motor that operates the swing body of the work machine 2. The hydraulic cylinder 11 is a work implement cylinder that operates the work implement of the work machine 2.

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

[0016] The levers 14 are operated by an operator on board the work machine 2. The levers 14 are operated to operate the work machine 2. The levers 14 include working levers that are operated to operate the work implement and the rotating body, and travel levers that are operated to operate the traveling body.

[0017] The temperature sensor 15 detects the temperature of the hydraulic oil in the hydraulic equipment. The detected 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 detected 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 turn 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 the hydraulic oil in the hydraulic equipment. The temperature sensor 15 may be considered as 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 seals. That is, a seal is provided for each of the hydraulic pump 7, valve 8, hydraulic motor 9, hydraulic motor 10, and hydraulic cylinder 11. The seals are made of rubber. Examples of seals include O-rings and rubber sheets. The seals prevent 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, deteriorating its sealing performance, there is a possibility that 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 it reaches the end of its life. On the other hand, if the sealing material is replaced when there is still some life left in the sealing material, replacement costs may be incurred and the replacement work may reduce the availability of the work machine 2. There is a demand for 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 can be replaced at the appropriate time. By predicting the life of the sealing material, it is possible to replace the sealing material 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 expressed as consumed life hours or consumed life percentage. If the consumed life of the sealing material is expressed as consumed life hours, the sealing material is determined to have reached the end of its life when the consumed life hours exceed a predetermined life time. If the consumed life of the sealing material is expressed as consumed life percentage, the sealing material is determined to have reached the end of its life when the consumed life percentage exceeds a predetermined life percentage.

[0026] In an embodiment, the management system 1 predicts the life of the seals provided in the 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 that is 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 the seals provided in the 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 work machine 2 having a sealing material whose lifespan is predicted will be referred to as the first work machine 2A, and the second work machine 2 different from the first work machine 2A will be referred to as the second work machine 2B. Furthermore, the hydraulic equipment of the first work 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 work 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 work machine 2A is the sealant whose lifespan is to be predicted. The second sealant of the second work machine 2B is the sealant after it has actually reached the end of its lifespan. In predicting the lifespan of the first sealant, the actual lifespan that indicates the actual lifespan 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 work machine 2B. The operating state of the second work machine 2B is detected by an operating state detection unit 16 provided on the second work machine 2B. In predicting the lifespan of the first sealant, the hydraulic oil temperature of the second hydraulic device is known data, and the operating state of the second work machine 2B is known data. In the following description, the hydraulic oil temperature of the second hydraulic device will be referred to as the hydraulic oil temperature history, and the operating state of the second work machine 2B will be referred to as the operating history, as appropriate.

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

[0030] [Lifespan Prediction System] Figure 3 is a functional block diagram showing a management system 1 for a work machine 2 according to an embodiment. As shown in Figure 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 operating state of the first work machine 2A detected by the operating 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 operating state (operation history) of the second work machine 2B detected by the operating 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 computer programs executed by the processor. The server 3 has a lifespan prediction unit 30 and a correction coefficient calculation unit 40. The lifespan prediction unit 30 predicts the lifespan 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 the first seal 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 statistics of the hydraulic oil temperature of the first hydraulic device and an Arrhenius plot for the first seal.

[0038] 4 is a diagram for explaining a method for calculating a calculated lifespan according to an embodiment. The calculated lifespan calculation unit 32 generates a hydraulic oil temperature histogram as statistical values ​​of hydraulic oil temperatures based on detection data from 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 ranges) and the time that each hydraulic oil temperature has continued. In addition, an Arrhenius plot for the sealing material is created in advance. The calculated lifespan calculation unit 32 generates an approximation line for the Arrhenius plot.

[0039] p ｎ indicates the cumulative usage time of the sealing material in the nth hydraulic oil temperature range. ３ and the cumulative use time p in the fourth hydraulic oil temperature range. ４ and are shown. ｎ indicates the estimated life time of the seal material in the nth hydraulic oil temperature range. ３ and the estimated life time q in the fourth hydraulic oil temperature range ４ The following is 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 operating time p of each of the plurality of hydraulic oil temperature ranges is calculated. ｎ o p １ , p ２ , ...p １２ and the estimated life time q of each of the multiple hydraulic oil temperature ranges ｎ q １ , q ２ , …q １２ and the calculated life consumption rate r for each of the multiple hydraulic oil temperature ranges ｎ r１ , r ２ , ...r １２ In this case, the following equation (1) holds:

[0041]

[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) reaches 100% is defined as the calculated life of the sealing material.

[0043]

[0044] The corrected life calculation unit 33 calculates the corrected life by correcting the calculated life of the first seal material expressed by equation (2) with a correction coefficient. 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 (actual lifespan) of the sealing material (first sealing material) may not match. The following first, second, and third factors are considered to be factors that cause the calculated lifespan and the actual lifespan of the sealing material to not match.

[0046] 5 is a diagram illustrating the relationship between the hydraulic oil temperature and the sealant temperature according to the embodiment. The first factor is that the temperature sensor 15 directly detects the hydraulic oil temperature but does not directly detect the sealant temperature. Therefore, a difference may occur between the hydraulic oil temperature and the sealant temperature at the detection position of the temperature sensor 15, or a difference may occur between the rate of change in the hydraulic oil temperature and the rate of change in the sealant temperature, as shown in FIG. 5.

[0047] The second factor is that when the flow state of hydraulic oil in a hydraulic device changes between lever-on and lever-off, there is a possibility that a difference will occur between the rate of change in the hydraulic oil temperature and the rate of change in the seal material temperature, 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 on), but does not detect the hydraulic oil temperature when the engine is off (key 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, which may cause the seal to thermally harden.

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

[0050] The correction coefficient will be described below. In this embodiment, the correction coefficient is calculated by the 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 using the correction coefficient stored in the correction coefficient storage unit 34.

[0051] The calculation of the correction coefficient uses the hydraulic oil temperature of the second hydraulic device and the operation history of the second work machine 2B. The controller 4 or server 3 of the second work machine 2B holds actual lifespan data indicating the actual lifespan of the second sealant. In this embodiment, the calculated lifespan of the second sealant provided on the second work machine 2B, which is used to calculate the correction coefficient, is calculated in the same way as the calculated lifespan of the first work machine 2A. That is, the correction coefficient calculation unit 40 calculates the calculated lifespan of the second sealant based on statistical values ​​of the hydraulic oil temperature history of the second hydraulic device and an Arrhenius plot for the second sealant. In this embodiment, the first operation data indicating the operating state of the first work machine 2A and the second operation data indicating the operation history of the second work machine 2B, which is used to calculate the correction coefficient, each contain a value a indicating the operating status. ｎ and a value b indicating the operation frequency ｎ Includes the value a indicating the operating status ｎcontains a value for steady operation. Value b indicating the operation frequency ｎ includes the frequency with which the content of operations changes.

[0052] Value a indicating the operating status ｎ and the actual operating time a per day of the work machine 2 (the first work machine 2A and the second work machine 2B) １ , the fuel consumption a of the work machine 2 ２ , the excavation time a during which the work machine 2 excavates the excavation target with the work implement ３ , and the travel time a ４ is exemplified.

[0053] Value b indicating the operation frequency ｎ as the number of times the engine 13 of the work machine 2 (the first work machine 2A and the second work machine 2B) is turned on, b １ , the number of times the engine 13 of the work machine 2 is turned off b ２ , the time interval b from turning on to turning off the engine 13 of the work machine 2 ３ , the time interval b from when the engine 13 of the work machine 2 is turned off to when it is turned on ４ , the number of times the lever 14 of the work machine 2 is turned on b ５ , the number of times the lever 14 of the work machine 2 is turned off b ６ , the time interval b from the ON to the OFF of the lever 14 of the work machine 2 ７ , the time interval b from the OFF to ON of the lever 14 of the work machine 2 ８ , and a lever output value b indicating the amount of operation of the lever 14 of the work machine 2 ９ is exemplified.

[0054] First correction coefficient α ｎ is expressed by the following equation (3): 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]

[0056]

[0057] FIG. 6 shows the actual measured value y of the life of the sealing material according to the embodiment. ｉand the calculated value x ｉ 6 is a graph showing the relationship between the actual measured values ​​y of the sealant lifespans of the first to tenth second working machines 2B. ｉ and the calculated value x ｉ As an example, the actual measurement value y １ is the actual measured value y for the first machine of the second work machine 2B. ｉ and the calculated value x １ is the calculated value x for the first machine of the second work machine 2B ｉ The actual measured value y ２ is the actual measured value y for the second machine of the second work machine 2B. ｉ and the calculated value x ２ is the calculated value x for the second machine of the second work machine 2B ｉ is.

[0058] Actual measured value of sealant 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. 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 calculated based on the above-mentioned calculated life. ｉ may be considered as the actual lifespan. The calculated seal lifespan x ｉ The first, second, and third factors described above may be considered as the calculated life. As shown in FIG. 6, the actual measured value y 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 of the sealant life. 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 equation (5) is minimized: ｎ Constant C1 for ｎ The correction coefficient calculation unit 40 determines the second correction coefficient β so that the following equation (5) is minimized: ｎ Constant C2 for ｎ and constant C3ｎ The following is established.

[0060]

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

[0062] As shown in FIG. 7, the constant C1 ｎ By defining the value a indicating the operating status, ｎ Based on this, the first correction coefficient α ｎ Each of the points shown in FIG. 7 is a value a ｎ There is a value (a １ , a ２ , a ３ , ...) when y ｉ =x ｉ ×α ｎ That is, the calculated value of the sealant life after correction (corrected life) is a value that matches the actually measured value of the sealant life (actual life).

[0063] As shown in FIG. 8, the constant C2 ｎ and constant C3 ｎ By defining the value b ｎ Based on this, the second correction coefficient β ｎ Each of the points shown in FIG. 8 is a value b ｎ There is a value (b １ , b ２ , b ３ , ...) when y ｉ =x ｉ ×β ｎ That is, the calculated value of the sealant life after correction (corrected life) is a value that matches the actually measured value of the sealant life (actual life).

[0064] In this way, the correction coefficient calculation unit 40 calculates the calculated lifespan 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 the correction coefficient based on the calculated lifespan of the second sealing material, the actual lifespan (actual lifespan) 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 calculates the corrected life by correcting the calculated life with the correction coefficient. The corrected life calculation unit 33 calculates the corrected life by correcting the calculated life with 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 these, 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 these, one second correction coefficient β ｎ Alternatively, a plurality of second correction factors 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 equations (6), (7), and (8):

[0066]

[0067]

[0068]

[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] [Lifespan Prediction Method] Figure 9 is a flowchart showing a lifespan prediction method for a sealing material according to an embodiment. In the example shown in Figure 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 stored in the life threshold 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 server 3 and controller 4 described above includes a computer system 1000. The computer system 1000 includes a processor 1001 such as a central processing unit (CPU), a main memory 1002 including a nonvolatile memory such as a read-only memory (ROM) and a volatile memory such as a random access memory (RAM), a storage 1003, and an interface 1004 including an input / output circuit. The functions of the server 3 and controller 4 described above are stored in the storage 1003 as computer programs. The processor 1001 reads the computer programs from the storage 1003, loads them into the main memory 1002, and executes the above-described processing in accordance with the programs. The computer programs may be distributed to the computer system 1000 via a network.

[0079] The computer program is capable of predicting the life of a seal provided in the hydraulic equipment of a first work machine 2A according to the above-described embodiment. The computer system is capable of detecting the hydraulic oil temperature of the first hydraulic equipment of the first work machine 2A, detecting the operating state of the first work machine 2A, calculating a correction coefficient based on the hydraulic oil temperature history of the second hydraulic equipment provided in each of a plurality of second work machines 2B and the operating history of the second work machine 2B, and predicting the life of the first seal 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] [Effects] As described above, according to the embodiment, the management system 1 can predict the lifespan of the seals provided in the hydraulic equipment of the work machine 2. By predicting the lifespan of the seals, the seals can be replaced at an appropriate time.

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

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

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

[0084] In the above-described embodiment, in predicting the lifespan of the first sealant, the second operational data indicating the operational history of the second work machine 2B is known data, and the correction coefficient is calculated based on the second operational data. In calculating the correction coefficient, second operational data may be added as needed. The correction coefficient calculation unit 40 may calculate a new correction coefficient based on the newly added second operational data, and update the correction coefficient storage unit 34.

[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...lifespan prediction unit, 31...operation data acquisition unit, 32...calculated lifespan calculation unit, 33...corrected lifespan calculation unit, 34...correction coefficient memory unit, 35...lifespan 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 the life of a first sealing material provided in a first hydraulic device of a first working machine, 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 the 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 and 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.

2. A life prediction system as described in claim 1, wherein the life prediction unit includes: 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; and a corrected life calculation unit that corrects the calculated life of the first sealing material with the correction coefficient to calculate a corrected life, and the life of the first sealing material includes the corrected life.

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

4. A life prediction system as described in claim 1, further comprising a correction coefficient calculation unit that calculates the correction coefficient, wherein the correction coefficient calculation unit calculates a calculated life of a second sealant provided in the second hydraulic equipment based on a hydraulic oil temperature history of the second hydraulic equipment, and calculates the correction coefficient based on the calculated life of the second sealant, an actual life of the second sealant, and an operating history of the second work machine.

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

6. A life prediction system as described in claim 1, wherein the life prediction unit has a correction coefficient memory unit that stores a correction coefficient calculated based on the hydraulic oil temperature history of the second hydraulic equipment and the operation history of the second work machine.

7. A life prediction system as described in claim 6, further comprising a correction coefficient calculation unit that calculates the correction coefficient based on the hydraulic oil temperature history of the second hydraulic equipment and the operation history of the second work machine, and the correction coefficient memory unit stores the correction coefficient calculated by the correction coefficient calculation unit.

8. A life prediction system as described in claim 2, wherein the life prediction unit has a comparison unit that compares the corrected life with a predetermined life threshold value, and a notification unit that notifies an output device of the comparison result of the comparison unit.

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

10. A life prediction system as described in claim 1, wherein each of the first operation data indicating the operating state of the first work machine and the second operation data indicating the operating history of the second work machine includes a value indicating the operating status and a value indicating the operating frequency.

11. A life prediction system as described in claim 10, wherein the value indicating the operating status includes at least one of the actual operating time of each of the first work machine and the second work machine, the fuel consumption of each of the first work machine and the second work machine, the excavation time that each of the first work machine and the second work machine excavates an excavation target with a work implement, and the traveling time that each of the first work machine and the second work machine travels.

12. A lifespan prediction system as claimed in claim 10, wherein the value indicating the operation frequency includes at least one of the number of times the engines of each of the first work machine and the second work machine are turned on, the number of times the engines of each of the first work machine and the second work machine are turned off, the time interval from on to off of the engines of each of the first work machine and the second work machine, the time interval from off to on of the engines of each of the first work machine and the second work machine, the number of times a lever operated to operate 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 each of the first work machine and the second work machine, the time interval from off to on of the levers of each of the first work machine and the second work machine, and a lever output value indicating the amount of operation of the levers of each of the first work machine and the second work machine.

13. A life prediction method for predicting the life of a first sealing material provided in a first hydraulic device of a first work machine, comprising: 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 the hydraulic oil temperature history of second hydraulic devices provided on each of a plurality of second work machines and the operating history of the second work machines; and 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 work machine, and the correction coefficient.

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