JP7301702B2 - Construction Machinery and Cylinder Parts Replacement Timing Prediction System - Google Patents

Description

The present invention relates to a construction machine and a cylinder part replacement time prediction system, and more particularly, a construction machine having a hydraulic cylinder having a seal part and a cylinder part for predicting the replacement time of the seal part of the hydraulic cylinder used in the construction machine. It relates to a replacement timing prediction system.

Construction machines such as hydraulic excavators and cranes generally include a hydraulic cylinder driven by pressure oil discharged from a hydraulic pump. A hydraulic cylinder is generally composed of a cylindrical cylinder body closed at both ends, a piston dividing the inside of the cylinder body into two pressure chambers, and one end attached to the piston and the other protruding from the cylinder body. and a piston rod. A hydraulic cylinder expands and contracts by causing a piston to slide within a cylinder body by supplying and discharging pressurized oil to and from a pressure chamber.

An annular groove is formed in the outer peripheral surface of the piston, and a piston seal is interposed in the annular groove. The piston seal moves (sliding) while being in contact with the inner peripheral surface of the cylinder body when the hydraulic cylinder expands and contracts. Therefore, the piston seal wears out as the sliding distance increases. In addition, the piston seal is deformed by being pressed against the end surface of the annular groove by the action of the pressure oil, or its material deteriorates due to the heat of the pressure oil, and its function gradually deteriorates. Therefore, it is necessary to replace the piston seal periodically. However, damage to the piston seal prior to replacement can lead to failure of the hydraulic cylinder. In this case, an increase in the downtime of the construction machine (reduced operation rate) and a burden of repair costs are incurred.

As a countermeasure against such problems, for example, a technique described in Patent Document 1 has been proposed. The actuator prediction system described in US Pat. Predict failures such as piston seals by comparing with known pressure vs. time curves obtained from hydraulic cylinders for which .

Japanese Patent Application Publication No. 2015-514947

However, the technique described in Patent Document 1 detects an abnormality based on the pressure vs. time curve generated from the data measured during the operation of the hydraulic cylinder. It is assumed that the piston seal is already defective or damaged. Therefore, it is considered that the effect is insufficient as a means for preventing malfunction of the hydraulic cylinder.

SUMMARY OF THE INVENTION The present invention has been made on the basis of the above matters, and an object of the present invention is to prevent failures of hydraulic cylinders by making it possible to replace seal parts of hydraulic cylinders at appropriate times. and to provide a cylinder parts replacement timing prediction system.

The present application includes a plurality of means for solving the above problems. To give one example, a construction machine equipped with a hydraulic cylinder having a sealing part includes a displacement sensor for detecting the displacement of the hydraulic cylinder and a notification device. and calculating a value related to the amount of change in displacement based on the displacement detected by the displacement sensor, and integrating the value related to the amount of change in displacement, so that the accumulated movement from the time of replacement of the seal part due to expansion and contraction of the hydraulic cylinder is calculated. and a control device that calculates an amount and outputs a notification command to the notification device when the cumulative movement amount becomes equal to or greater than a threshold value.

According to the present invention, it is possible to accurately predict the state of deterioration of the seal component of the hydraulic cylinder based on the integrated value obtained by integrating the values relating to the amount of change in displacement calculated based on the displacement detected by the displacement sensor. Therefore, by notifying the people involved in the construction machinery of the replacement timing of the seal parts based on the accurately predicted state of the seal parts, it becomes possible to replace the seal parts of the hydraulic cylinder at an appropriate time. It is possible to prevent malfunction of the cylinder.
Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

1 is a diagram showing a hydraulic excavator to which a construction machine according to a first embodiment of the present invention is applied; FIG. 1 is a longitudinal sectional view showing a hydraulic cylinder forming part of a construction machine according to a first embodiment of the present invention; FIG. FIG. 3 is a cross-sectional view showing an enlarged state of a portion of the hydraulic cylinder indicated by symbol S in FIG. 2 ; 1 is a block diagram showing the hardware configuration and functional configuration of a control device forming part of a construction machine according to a first embodiment of the present invention; FIG. FIG. 5 is a flow chart showing an example of an arithmetic processing procedure regarding part replacement timing by a control device constituting a part of the first embodiment of the construction machine of the present invention shown in FIG. 4; FIG. FIG. 4 is a diagram showing a hydraulic excavator to which a construction machine according to a second embodiment of the present invention is applied; FIG. 6 is a block diagram showing the hardware configuration and functional configuration of a control device forming part of a construction machine according to a second embodiment of the present invention; FIG. 8 is a flow chart showing an example of an arithmetic processing procedure regarding part replacement timing by a control device constituting a part of the second embodiment of the construction machine of the present invention shown in FIG. 7; FIG. FIG. 5 is a block diagram showing the hardware configuration and functional configuration of a control device in a modified example of the second embodiment of the construction machine of the present invention; FIG. 10 is a flow chart showing an example of an arithmetic processing procedure regarding part replacement timing by a control device forming part of the modification of the second embodiment of the construction machine of the present invention shown in FIG. 9; FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing the configuration of an embodiment of a cylinder part replacement timing prediction system of the present invention; BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the hardware configuration and functional configuration of a server forming part of an embodiment of a cylinder part replacement time prediction system of the present invention;

An embodiment of a construction machine and a cylinder part replacement timing prediction system according to the present invention will be described below with reference to the drawings. In this embodiment, a hydraulic excavator will be described as an example of a construction machine.

First, the configuration of a hydraulic excavator to which a construction machine according to a first embodiment of the present invention is applied will be described with reference to FIGS. 1 to 3. FIG. FIG. 1 is a diagram showing a hydraulic excavator to which a first embodiment of the construction machine of the present invention is applied. FIG. 2 is a vertical cross-sectional view showing a hydraulic cylinder forming part of the construction machine according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view showing an enlarged state of a portion of the hydraulic cylinder indicated by symbol S in FIG.

In FIG. 1, a hydraulic excavator 1 as a construction machine includes a self-propelled lower traveling body 2, an upper revolving body 3 rotatably mounted on the lower traveling body 2, and a front portion of the upper revolving body 3 which is elevated. and a front work machine 4 provided movably.

The lower traveling body 2 is provided with crawler-type traveling devices 11 on the left and right sides. The left and right travel devices 11 are driven by travel hydraulic motors 12, respectively.

The upper revolving structure 3 is driven to revolve with respect to the lower traveling structure 2 by a revolving hydraulic motor (not shown). The upper revolving body 3 includes a revolving frame 21 as a support structure, an operator's cab 22 installed on the front left side of the revolving frame 21, a machine room 23 arranged on the rear side of the revolving frame 21, a revolving and a counterweight 24 attached to the rear end of the frame 21 . In the operator's cab 22, an operation device (not shown) for an operator to operate the machine body such as the front working machine 4, a monitor device 91 described later, and the like are arranged. The machine room 23 accommodates a hydraulic pump and control valves that constitute a hydraulic system for driving the machine body such as the front working machine 4, a prime mover (both not shown) that drives the hydraulic pump, and the like. The counterweight 24 is for balancing the weight with the front working machine 4 .

The front work machine 4 is a multi-joint work device for performing excavation work and the like, and includes, for example, a boom 31, an arm 32, and a bucket 33 as an attachment. The base end of the boom 31 is rotatably connected to the front end of the revolving frame 21 of the upper revolving body 3 via a first rotating shaft (not shown). A proximal end of an arm 32 is rotatably connected to a distal end of the boom 31 via a second rotating shaft 35 . The base end of the bucket 33 is rotatably connected to the tip of the arm 32 via the third rotating shaft 36 . The boom 31 is driven by a boom cylinder 37 that spans the upper swing body 3 and the boom 31 . The arm 32 is driven by an arm cylinder 38 that spans the boom 31 and the arm 32 . The bucket 33 is driven by a bucket cylinder 39 that spans the arm 32 and the bucket 33 via a link mechanism 40 . The boom cylinder 37, the arm cylinder 38, and the bucket cylinder 39 are hydraulic cylinders that can be extended and contracted by supplying pressure oil. These hydraulic cylinders 37 , 38 , 39 are supplied with pressure oil from hydraulic pumps. Driving of the hydraulic cylinders 37, 38, and 39 is controlled by operation signals such as hydraulic signals and electric signals output from the operating device.

The boom cylinder 37, the arm cylinder 38, and the bucket cylinder 39 are hydraulic cylinders having the same basic structure. Therefore, the configurations of the boom cylinder 37, the arm cylinder 38, and the bucket cylinder 39 will be explained using the same drawings (FIGS. 2 and 3).

2, the hydraulic cylinder (boom cylinder 37, arm cylinder 38, bucket cylinder 39) includes a cylinder body 41, a piston rod 42 movable inside the cylinder body 41, and one end of the piston rod 42 (see FIG. 2). 2), and a first pressure chamber (hereinafter referred to as bottom chamber) C1 on the bottom side (right side in FIG. 2) where the piston rod 42 does not exist in the cylinder body 41 and the piston rod 42 side ( It has a piston 43 that partitions into two chambers, the second pressure chamber (hereinafter referred to as rod chamber) C2 on the left side in FIG.

The cylinder body 41 includes, for example, a cylindrical cylinder tube 45 closed at one axial end (right end in FIG. 2) and open at the other end (left end in FIG. 2), and an opening of the cylinder tube 45. and a cover 46 attached to close the A first supply/discharge port 45a for supplying/discharging hydraulic oil to/from the bottom chamber C1 and a ring-shaped first mounting portion 45b are provided at the closed end of the cylinder tube 45. . The cover 46 is provided with a second supply/discharge port 46a for supplying/discharging hydraulic oil to/from the rod chamber C2. The piston rod 42 extends inside and outside the cylinder body 41 through the cover 46 and has a ring-shaped second mounting portion 42 a at the tip located outside the cylinder body 41 . A rod seal 47 that seals a gap between the piston rod 42 and the cover 46 (cylinder body 41) is mounted on the cover 46 side. The rod seal 47 is configured to slide relative to the outer peripheral surface of the piston rod 42 .

The piston 43 is configured to slide against the inner peripheral surface of the cylinder tube 45 . An annular groove 49 for mounting a piston seal 50 is provided on the outer peripheral surface of the piston 43, as shown in FIG. The annular groove 49 includes, for example, first annular grooves 49a provided at both ends (left and right ends in FIG. 3) in the axial direction (movable direction) of the outer peripheral surface of the piston 43, It is composed of a pair of second annular grooves 49b provided axially inside the grooves 49a, and one third annular groove 49c provided between the pair of second annular grooves 49b. there is A contamination seal ring 51 is arranged in each first annular groove 49a. The contamination seal ring 51 prevents impurities contained in the hydraulic oil and foreign substances (contamination) mixed in the hydraulic oil from entering the gap between the inner peripheral surface of the cylinder tube 45 and the outer peripheral surface of the piston 43. . A bearing ring 52 is arranged in each second annular groove 49b. The outer peripheral surface of the bearing ring 52 contacts the inner peripheral surface of the cylinder tube 45 and has a function of supporting the piston 43 slidably with respect to the cylinder tube 45 . A seal ring 53 is arranged in the third annular groove 49c. The seal ring 53 suppresses leakage of hydraulic oil between the bottom chamber C1 and the rod chamber C2.

In each hydraulic cylinder 37, 38, 39, as shown in FIG. 2, pressure oil is supplied to the bottom chamber C1 through the first supply/discharge port 45a, and the second supply/discharge port 46a on the rod chamber C2 side is operated. When connected to an oil tank (not shown), the piston 43 slides in the cylinder tube 45 toward the cover 46 (left side in FIG. 2) so that the piston rod 42 protrudes from the cylinder body 41. It expands by Further, when pressure oil is supplied to the rod chamber C2 through the second supply/discharge port 46a and the first supply/discharge port 45a on the bottom chamber C1 side is connected to the hydraulic oil tank, the piston 43 is pushed out of the cylinder tube 45. The piston rod 42 is slid in the cylinder tube 45 to the closed end side (right side in FIG. 2) and moved so as to be pulled into the cylinder body 41 to contract.

The piston seal 50 shown in FIG. 3 moves (sliding) while being in contact with the inner peripheral surface of the cylinder tube 45 when the hydraulic cylinders 37, 38, 39 expand and contract. Therefore, the piston seal 50 wears out as the sliding distance increases. Further, the piston seal 50 is deformed by being pressed against the side wall surface of the annular groove 49 by the action of the pressure oil, or its material deteriorates due to the heat of the high temperature pressure oil, and its function gradually deteriorates. will decline. Therefore, it is necessary to replace the piston seal 50 periodically. Damage to the piston seal 50 prior to replacement may lead to failure of the hydraulic cylinders 37,38,39. In this case, repair costs for the hydraulic cylinders 37, 38, and 39 are incurred, and the hydraulic excavator 1 having the hydraulic cylinders 37, 38, and 39 is stopped.

The rod seal 47 also slides relative to the outer peripheral surface of the piston rod 42 when the hydraulic cylinders 37 , 38 , 39 extend and retract. Therefore, like the piston seal 50, the rod seal 47 also wears as the sliding distance with respect to the piston rod 42 increases. In addition, the function gradually deteriorates due to deformation due to the action of pressure oil, deterioration of materials due to high temperature pressure oil, and the like. Therefore, the rod seal 47 also needs to be replaced periodically.

Therefore, the hydraulic excavator 1 according to the present embodiment includes a cylinder parts replacement timing prediction system that predicts the replacement timing of the seal parts of each hydraulic cylinder such as the boom cylinder 37, the arm cylinder 38, and the bucket cylinder 39. As shown in FIG. 1, the cylinder parts replacement timing prediction system is a first displacement system that detects displacements x (relative positions with respect to a predetermined position) of the boom cylinder 37, the arm cylinder 38, and the bucket cylinder 39, respectively. The displacement x detected by the sensor 61a, the second displacement sensor 61b, the third displacement sensor 61c, and each of the displacement sensors 61a, 61b, and 61c (the three displacement sensors may be collectively referred to as 61 below) A control device 70 that performs various arithmetic processing regarding the replacement timing of the seal parts of the hydraulic cylinders 37, 38, and 39, and a notification device that is arranged in the operator's cab 22 and notifies the result of the arithmetic processing of the control device 70. and a monitor device 91 that functions as a

The first to third displacement sensors 61a, 61b, 61c are, for example, linear potentiometers that directly detect displacements of the respective hydraulic cylinders 37, 38, 39. attached to each. The first to third displacement sensors 61 a , 61 b , 61 c are electrically connected to the control device 70 and output detection signals of the displacement x of the hydraulic cylinders 37 , 38 , 39 to the control device 70 .

The control device 70 is arranged inside the hydraulic excavator 1 (in FIG. 1, it is illustrated outside the hydraulic excavator 1 for convenience). The control device 70 outputs the result of the arithmetic processing to the monitor device 91 and also transmits it to the server 92 . Details of the configuration and functions of the control device 70 will be described later.

The monitor device 91 is electrically connected to, for example, the control device 70, and displays various information on the display screen in response to a notification command or the like from the control device 70, which will be described later.

The control device 70 is configured to be connectable via a communication network 100 to a server 92 installed in a management center or the like outside the hydraulic excavator 1 . The server 92 stores, for example, various types of information about a plurality of construction machines including the hydraulic excavator 1, and receives a notification command, replacement time information, and the like from the control device 70, which will be described later. The server 92 connects an information processing device 93 such as a PC and a portable terminal device 94 such as a mobile phone, which are used by service personnel of construction machinery manufacturers, owners of construction machinery, construction managers, and other persons concerned with construction machinery, to a communication network. 100 can be connected. The information processing device 93 and the portable terminal device 94 in the present embodiment function as a notification device that receives the result of the arithmetic processing of the control device 70 via the server 92 and notifies the relevant personnel of the hydraulic excavator 1 of the result. It is something to do.

Next, the hardware configuration and functional configuration of the control device in the construction machine according to the first embodiment of the present invention will be described with reference to FIG. FIG. 4 is a block diagram showing the hardware configuration and functional configuration of a control device forming part of the construction machine according to the first embodiment of the present invention.

In FIG. 4, the control device 70 has a hardware configuration such as a storage device 71 made up of a RAM, a ROM, etc., a processing device 72 made up of a CPU, etc., and an external device such as a server 92 capable of communicating with the outside via the communication network 100. and a communication device 73 that The storage device 71 preliminarily stores programs and various information necessary for various kinds of arithmetic processing regarding the replacement timing of the seal parts 50 and 47 of the hydraulic cylinders 37 , 38 and 39 . The processing device 72 reads a predetermined program and various information from the storage device 71 as appropriate, and executes processing according to the program, thereby realizing the following various functions.

The control device 70 includes, for example, a storage unit 81 as a function of the storage device 71, a displacement change amount calculation unit 82 as a function executed by the processing device 72, a cumulative movement amount calculation unit 83, a replacement timing determination unit 84, a replacement A timing information calculation unit 85 is provided. Note that the control device 70 separately performs arithmetic processing regarding the replacement timing of the seal parts of the boom cylinder 37, the arm cylinder 38, and the bucket cylinder 39, respectively. However, since all of those calculation processes are the same, only the calculation process for one hydraulic cylinder will be described in FIG.

The threshold value X _th is stored in advance in the storage unit 81 . The threshold value X _th is used for determination by the replacement timing determination unit 84, and is a comparison target of the accumulated movement amount X described later.

The displacement change amount calculator 82 sequentially calculates the absolute value Δxa of the displacement change amount of the hydraulic cylinders 37, 38, 39 based on the displacement x sequentially detected by the displacement sensors 61 (61a, 61b, 61c). be. Specifically, the displacement change amount calculation unit 82 takes in the detection signal of the displacement x detected by the displacement sensor 61 for each calculation loop of a series of calculation processing (see FIG. 5 described later), and calculates the current calculation loop (count When the displacement taken in the calculation loop of n) is _xn and the displacement taken in the previous calculation loop (calculation loop of count n-1) is xn _-1 , the displacement _xn to the displacement _xn By taking the absolute value of the value obtained by subtracting _-1 , the absolute value Δxa of the amount of change in displacement is calculated. That is, the displacement change amount calculator 82 calculates the absolute value Δxa of the displacement change amount based on the following equation (1).
Δxa=|x _n −x _n−1 | (1)

Cumulative movement amount calculation unit 83 integrates the absolute value Δxa of the amount of change in displacement calculated by displacement change amount calculation unit 82 from the time of replacement of seal parts 50 and 47 . It calculates the cumulative amount of movement due to the expansion and contraction of the hydraulic cylinders 37, 38, and 39 (that is, the cumulative amount of movement of the piston 43 and the piston rod 42) up to the current calculation process. The cumulative amount of movement of the piston 43 and the piston rod 42 corresponds to the sum of the distances by which the seal parts such as the piston seal 50 and the rod seal 47 slide relative to each other. Since the wear state (deterioration state) of the seal part progresses in accordance with the size of the sliding distance of the seal part, the sliding distance (cumulative amount of movement) of the seal part serves as an indicator of the replacement timing of the seal part.

Specifically, the cumulative displacement calculation unit 83 adds the absolute value Δxa of the displacement change amount, which is the calculation result of the displacement change calculation unit 82, to the cumulative displacement X obtained in the previous calculation loop for each calculation loop. By adding to the current calculation loop, the cumulative movement amount X up to the current calculation loop is calculated. That is, the cumulative movement amount calculator 83 calculates the cumulative movement amount X based on the following equation (2).
X=X+Δxa (2)

In addition, the cumulative movement amount calculation unit 83 causes the storage unit 81 to store the cumulative movement amount X of the final calculation result as the initial value X _ini at the end of the series of calculation processing. Furthermore, the cumulative movement amount calculation unit 83 reads the initial value X _ini stored in the storage unit 81 and sets it as the initial value of the cumulative movement amount X at the start of a series of calculation processes.

The replacement timing determination section 84 determines whether or not the replacement timing of the seal components of the piston seal 50 or the rod seal 47 has arrived based on the cumulative movement amount X calculated by the cumulative movement amount calculation section 83. . Specifically, the replacement timing determination unit 84 determines by comparing the cumulative movement amount X, which is the calculation result of the cumulative movement amount calculation unit 83 , with the threshold value X _th prestored in the storage unit 81 . That is, the replacement timing determination unit 84 determines the replacement timing of the sealing parts of the hydraulic cylinders 37, 38, and 39 based on the following equation (3). The threshold value X _th is set based on the resistance to sliding wear of the piston seal 50 and rod seal 47 of each hydraulic cylinder 37, 38, 39, and the piston seal 50 and rod seal 47 are free from defects and damage. It is the amount of movement that can maintain normal function.
X≧X _th (3)

When the replacement timing determination unit 84 determines that the cumulative movement amount X is equal to or greater than the threshold value _Xth , the replacement timing determination unit 84 outputs a notification command to the monitor device 91 to notify that the seal parts of the hydraulic cylinders 37, 38, and 39 are due to be replaced. , and output to the server 92 via the communication device 73 .

The replacement timing information calculation unit 85 calculates replacement timing information I indicating the degree of margin until the replacement timing of the seal parts of the hydraulic cylinders 37 , 38 , 39 . Specifically, the replacement timing information calculation unit 85 calculates the replacement timing information I, which is the ratio of the cumulative movement amount X of the calculation result of the cumulative movement amount calculation unit 83 to the threshold value _Xth stored in the storage unit 81 in advance. do. That is, the replacement timing determination unit 84 calculates the replacement timing information I based on the following equation (4).
I=X/ _Xth (4)

Furthermore, the replacement time information calculation unit 85 outputs the replacement time information I as a calculation result to the monitor device 91 and also to the server 92 via the communication device 73 .

Next, an example of the arithmetic processing procedure executed by the control device in the construction machine according to the first embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG. FIG. 5 is a flow chart showing an example of an arithmetic processing procedure regarding part replacement timing by the control device forming part of the first embodiment of the construction machine of the present invention shown in FIG.

A series of arithmetic processing of the control device 70 shown in FIG. 5 is basically executed for each operating cycle of the hydraulic excavator 1 from start to stop of the engine of the excavator 1 (steps S10 to S100). . When the operation cycle of the hydraulic excavator 1 is performed many times, the series of arithmetic processing shown in FIG. 5 is repeated many times accordingly. In this case, since the hydraulic cylinders 37, 38 and 39 are repeatedly expanded and contracted, the cumulative movement amount X of the hydraulic cylinders 37, 38 and 39 calculated by the cumulative movement amount calculation unit 83 (the piston seal 50 and the total sliding distance of the seal parts of the rod seal 47) reaches the threshold value _Xth or more (YES in step S70), and the seal parts 50, 47 of the hydraulic cylinders 37, 38, 39 are due to be replaced. A notification command is output to notify that there is something (step S110).

Specifically, when the engine of the hydraulic excavator 1 is started, the control device 70 shown in FIG. 4 starts executing a series of arithmetic processing for predicting the replacement timing of the seal parts of the hydraulic cylinders 37, 38, and 39 (see FIG. 4). 5). First, the control device 70 initializes the count of the arithmetic loops executed in the series of arithmetic processing, and the initial value stored in the storage device 71 as the initial value of the cumulative movement amount X at the start of the series of arithmetic processing. Set the value X _ini . That is, n=1 and X=X _ini (step S10 shown in FIG. 5). The initial value X _ini is the final calculation result of the cumulative movement amount X obtained by a series of calculation processes executed by the control device 70 in the previous operation cycle of the hydraulic excavator 1 .

Next, the displacement change amount calculator 82 of the control device 70 takes in the displacement x of each of the hydraulic cylinders 37, 38, 39 detected by the displacement sensors 61 (61a, 61b, 61c) (step S20 shown in FIG. 5). Furthermore, the displacement change amount calculation unit 82 calculates the absolute value of the difference between the displacement _xn taken in the calculation loop of the current count n and the displacement _xn-1 taken in the calculation loop of the previous count n-1. The absolute value Δxa of the amount of change in displacement is calculated by the above equation (1) (step S30 shown in FIG. 5). The absolute value Δxa of the amount of change in displacement is determined by the movement of the hydraulic cylinders 37, 38, and 39 within the time from the calculation loop of count n−1 to the calculation loop of count n (the period in which the calculation loop is executed once). This corresponds to a minute distance (minute movement amount).

Next, the cumulative movement amount calculation unit 83 of the control device 70 calculates the absolute value Δxa of the displacement change amount, which is the calculation result of the displacement change amount calculation unit 82, and calculates the cumulative movement amount X (count n− The cumulative movement amount X in the current calculation loop of the count n is calculated (step S40 shown in FIG. ). As a result, minute movement amounts of the hydraulic cylinders 37, 38, and 39 moved within the period of one calculation loop (for example, 0.1 second) are added to the accumulated movement amount X.

Then, the replacement timing information calculation unit 85 of the control device 70 divides the cumulative movement amount X, which is the calculation result of the cumulative movement amount calculation unit 83, by the threshold value _Xth stored in the storage unit 81. , the replacement time information I is calculated (step S50 shown in FIG. 5). Further, the replacement time information I of the calculation result is output to the monitor device 91 and output to the server 92 via the communication device 73 (step S60 shown in FIG. 5).

As a result, the monitor device 91 can display the replacement time information I at the time of the current calculation loop of the count n on the display screen of the monitor device 91 . In addition, the server 92 transmits the replacement time information I from the control device 70 to the information processing device 93 and the portable terminal device 94 used by the persons concerned with the construction machine via the communication network 100 as necessary. (See Figure 1).

After that, the replacement timing determination unit 84 of the control device 70 compares the cumulative movement amount X calculated by the cumulative movement amount calculation unit 83 with the threshold value X _th stored in the storage unit 81. According to the above equation (3), It is determined whether or not it is time to replace the seal parts 50, 47 of the hydraulic cylinders 37, 38, 39 (step S70 shown in FIG. 5). If NO is determined in step S70, the control device 70 proceeds to step S80, and thereafter repeats the processing steps (computation loop) of steps S90 and S20 to S80 until it is determined YES in step S80 or YES in step S70. . On the other hand, if the determination in step S80 is YES, control device 70 proceeds to step S100 and then terminates the series of arithmetic processing. Further, if the determination in step S70 is YES, the control device 70 proceeds to step S110 and then terminates the series of arithmetic processing.

Specifically, in step S70, when the cumulative movement amount X is compared with the threshold value _Xth and the replacement timing determination unit 84 determines that the cumulative movement amount X is smaller than the threshold value _Xth (NO), the control device 70 determines whether or not the engine has been stopped (step S80 shown in FIG. 5). If it is determined that the engine has not been stopped (NO), the control device 70 increments the calculation loop count n by 1 to n=n+1 (step S90 shown in FIG. 5), and the next calculation loop (count n+1 operation loop) is started.

The control device 70 again captures the displacement x of the hydraulic cylinder detected by the displacement sensor 61 (step S20 shown in FIG. 5), and subtracts the displacement captured in the previous computation loop of the count n from the displacement captured in the current computation loop of the count n+1. (step S30 in FIG. 5), and the amount of change in displacement during the period from the current calculation loop of count n+1 to the previous calculation loop of count n The cumulative movement amount X is calculated by adding the absolute value Δxa of (step S40 shown in FIG. 5). This accumulated movement amount X is a value obtained by adding the initial value X _ini to the sum of the absolute values Δxa of the displacement change amounts sequentially calculated from the calculation loop of count 1 (first) to the current calculation loop of count n+1. Become. Therefore, the cumulative movement amount X of the calculation result corresponds to the cumulative movement amount of the hydraulic cylinders 37, 38, 39 from the replacement of the seal parts 50, 47 of the hydraulic cylinders 37, 38, 39 to the current calculation processing.

If it is determined that the engine has been stopped (YES) in step S80 after repeating the calculation loop of steps S90 and S20 to S80, the final calculation result calculated by the cumulative movement amount calculation unit 83 is The accumulated movement amount X is stored in the storage device 71 as the initial value X _ini (step S100 shown in FIG. 5), and the series of calculation processing is completed. The initial value X _ini stored in the storage device 71 is the initial value X _ini read from the storage device 71 at the start of the current series of arithmetic processing. The amount of movement of 37, 38, and 39 is added. By using this initial value X _ini as the initial value of the cumulative movement amount X of the series of arithmetic processing to be executed next time, the cumulative movement amount of the hydraulic cylinders 37, 38, 39 from the time of replacement of the seal parts 50, 47 is calculated. be able to. Since this accumulated movement amount X corresponds to the total sliding distance of the seal parts 50 and 47 after replacement, it serves as an index that accurately reflects the deterioration state of the seal parts 50 and 47 .

When the operation cycle from start to stop of the engine of the hydraulic excavator 1 is performed many times, the processing steps S10 to S100 shown in FIG. 5 are repeatedly performed many times. In this case, since the expansion and contraction operation of the hydraulic cylinder is repeatedly performed, at a certain point in time when the series of calculation processes shown in _FIG . reach.

In this case, in step S70, the replacement timing determination unit 84 compares the cumulative movement amount X with the threshold value _Xth and determines that the cumulative movement amount X is equal to or greater than the threshold value _Xth (YES). A notification command for notifying that the seal parts 50 and 47 of 39 are due to be replaced is output to the monitor device 91 and to the server 92 via the communication device 73 (step S110 shown in FIG. 5).

The monitor device 91 displays on the display screen an indication (for example, characters or icons) prompting replacement of the seal parts 50 and 47 of the hydraulic cylinders 37 , 38 and 39 in response to the notification command from the control device 70 . As a result, the operator of the hydraulic excavator 1 can know the proper replacement timing of the seal parts 50 and 47 before the hydraulic cylinders 37, 38 and 39 malfunction.

In addition, the server 92 provides the sealing parts of the hydraulic cylinders 37, 38, 39 via the communication network 100 as necessary to the information processing device 93 and the portable terminal device 94 used by the persons involved in the construction machine. 50 and 47 transmit a notification command to notify that it is time for replacement. Therefore, it is possible to inform the persons concerned with the hydraulic excavator 1 that it is time to replace the seal parts 50, 47 of the hydraulic cylinders 37, 38, 39 before any trouble occurs in the hydraulic cylinders 37, 38, 39. can.

Among the processing steps shown in FIG. 5, the order of steps S50 to S60 and step 70 can be changed or arranged in parallel.

As described above, in the first embodiment, in the hydraulic excavator (construction machine) 1 equipped with the hydraulic cylinders 37, 38, 39 having the seal parts 50, 47, the displacement x of the hydraulic cylinders 37, 38, 39 is Based on the displacement x detected by the displacement sensor 61 (61a, 61b, 61c), the monitor device (informing device) 91, and the displacement x detected by the displacement sensor 61, a value Δxa relating to the amount of change in displacement is calculated. A monitor _device ( annunciation _ _ and a control device 70 that outputs to a device) 91 .

According to such a configuration, the cumulative movement amount X ( Accurate prediction of the deterioration state of the sealing parts 50 and 47 is possible based on the integrated value) . Therefore, based on the accurately predicted states of the seal parts 50 and 47, the timing for replacing the seal parts 50 and 47 is notified to the persons concerned with the hydraulic excavator (construction machine) 1, thereby enabling the hydraulic cylinders 37, 38 and 39 to The sealing parts 50, 47 can be replaced at appropriate times, and malfunctions of the hydraulic cylinders 37, 38, 39 can be prevented.

Further, as described above, in the first embodiment, in the cylinder part replacement timing prediction system for predicting the replacement timing of the seal parts 50, 47 of the hydraulic cylinders 37, 38, 39 of the hydraulic excavator (construction machine) 1, , displacement sensors 61 (61a, 61b, 61c) for detecting the displacement x of the hydraulic cylinders 37, 38, 39, and the displacement x detected by the displacement sensor 61. By accumulating the value Δxa related to the amount of change in the displacement obtained from the time of replacement of the seal parts 50 and 47, the cumulative movement amount X due to expansion and contraction of the hydraulic cylinders 37, 38, and 39 is calculated. A control device 70 that compares with X _th and transmits a notification command when it is determined that the cumulative movement amount X of the calculation result is equal to or greater than the threshold value X _th ; Then, the received notification command is used by a person concerned with the hydraulic excavator (construction machine) 1, and information processing as a notification device for notifying that the seal parts 50 and 47 are due to be replaced in response to the notification command. A server 92 that transmits a notification command to a device 93 and a portable terminal device 94 is provided.

According to such a configuration, the value Δxa related to the amount of change in displacement calculated based on the displacement x detected by the displacement sensor 61 is integrated from the point of time when the seal parts 50 and 47 are replaced. is calculated, the deterioration state of the sealing parts 50 and 47 can be accurately predicted. Therefore, based on the accurately predicted states of the seal parts 50 and 47, the replacement timing of the seal parts 50 and 47 is notified to the persons concerned with the hydraulic excavator (construction machine) 1, thereby enabling the hydraulic cylinders 37, 38 and 39 to The sealing parts 50, 47 can be replaced at appropriate times, and malfunctions of the hydraulic cylinders 37, 38, 39 can be prevented.

Further, in the present embodiment, the control device 70 calculates the replacement time information I indicating the margin, which is the ratio of the cumulative movement amount X (integrated value) of the calculation result to the threshold value X _th , and the monitor device (notification device). 91. According to this configuration, it is possible to prevent replacement of the seal components 50, 47 of the hydraulic cylinders 37, 38, 39 even though there is a sufficient remaining period until the replacement time. Also, based on the replacement time information I, it is possible to create a plan such as a maintenance schedule.

Next, a construction machine according to a second embodiment of the present invention will be described with reference to FIGS. 6 to 8. FIG. FIG. 6 is a diagram showing a hydraulic excavator to which a construction machine according to a second embodiment of the present invention is applied. FIG. 7 is a block diagram showing the hardware configuration and functional configuration of a control device forming part of the second embodiment of the construction machine of the present invention. FIG. 8 is a flow chart showing an example of an arithmetic processing procedure regarding part replacement timing by the control device forming part of the second embodiment of the construction machine of the present invention shown in FIG. In FIGS. 6 to 8, parts having the same reference numerals as those shown in FIGS. 1 to 5 are the same parts, and detailed description thereof will be omitted.

The second embodiment of the construction machine of the present invention shown in FIGS. 6 and 7 differs from the first embodiment mainly in the following three points. First, it further comprises a temperature sensor 62 for detecting the temperature of hydraulic fluid flowing through the hydraulic system including the hydraulic cylinders 37,38,39. Secondly, each hydraulic cylinder 37, 38, 39 has a bottom chamber C1 and a rod chamber C2 (see FIG. 2) of each hydraulic cylinder 37, 38, 39 in addition to the displacement sensor 61 (61a, 61b, 61c). A first pressure sensor 63 and a second pressure sensor 64 are provided to detect the pressure of each. Thirdly, the control device 70A has an additional function and a partially different function with respect to the arithmetic processing function.

Specifically, in FIG. 6, the boom cylinder 37 is attached with a first pressure sensor 63a for the bottom chamber and a second pressure sensor 64a for the rod chamber. A first pressure sensor 63b for the bottom chamber and a second pressure sensor 64b for the rod chamber are attached to the arm cylinder 38 . A first pressure sensor 63c for the bottom chamber and a second pressure sensor 64c for the rod chamber are attached to the bucket cylinder 39 . The first pressure sensors 63a, 63b, 63c and the second pressure sensors 64a, 64b, 64c are electrically connected to the control device 70A, respectively, and measure the pressures in the bottom chambers of the boom cylinder 37, the arm cylinder 38, and the bucket cylinder 39. A detection signal of pressure P1 and rod chamber pressure P2 is output to the control device 70A.

The temperature sensor 62 is installed, for example, in a hydraulic fluid tank (not shown) of the hydraulic system. The temperature sensor 62 is electrically connected to the control device 70A and outputs a detection signal of the temperature T of the working oil to the control device 70A.

In FIG. 7, a control device 70A according to the present embodiment includes various functions similar to those of the control device 70 according to the first embodiment, and a pressure selection unit 86 as a function executed by a processing device 72. , a first correction coefficient calculator 87 , a second correction coefficient calculator 88 , a third correction coefficient calculator 89 , and a correction coefficient determiner 90 . Further, the accumulated movement amount calculation section 83A in the present embodiment differs in the calculation method of the accumulated movement amount X from the accumulated movement amount calculation section 83 in the first embodiment. Arithmetic processing regarding replacement timing of each seal component of the boom cylinder 37, the arm cylinder 38, and the bucket cylinder 39 executed by the control device 70A is performed separately, but is similar. Therefore, the description of the arithmetic processing in the present embodiment also deals with one hydraulic cylinder. Therefore, only one each of the first and second pressure sensors 63 and 64 is shown in FIG.

The pressure selection unit 86 sequentially (for each calculation loop) takes in the detection signals of the pressures P1 and P2 in the bottom chambers and rod chambers of the hydraulic cylinders 37, 38 and 39 detected by the first and second pressure sensors 63 and 64, The larger one of the taken pressures P1 and P2 is selected. That is, the pressure selection unit 86 selects the pressure P based on the following equation (5). The pressure selection section 86 outputs the selected pressure P to the third correction coefficient calculation section 89 .
P=MAX (P1, P2) … (5)

The first correction coefficient calculator 87 sequentially (calculates) the first correction coefficient Cx corresponding to the absolute value Δxa of the displacement change amount, which is the calculation result of the displacement change calculator 82, based on the table for the first correction coefficient Cx. each loop). The first correction coefficient calculator 87 outputs the first correction coefficient Cx as a calculation result to the correction coefficient determiner 90 . In the first correction coefficient Cx table, for example, the first correction coefficient Cx is set to 1 when the absolute value Δxa of the amount of change in displacement is smaller than a predetermined value, and the first correction coefficient Cx is set to 1 when Δxa is equal to or greater than the predetermined value. The correction coefficient Cx is set to increase in proportion to Δxa.

The absolute value Δxa of the amount of change in displacement indicates a very small moving distance of the hydraulic cylinder within the period of one calculation loop, and can be regarded as the sliding speed of the piston seal 50 and the rod seal 47. . The service life (replacement time) of the piston seal 50 and the rod seal 47 is affected not only by the sliding distance but also by the sliding speed. Therefore, the first correction coefficient Cx is intended to convert the effect of the sliding speed on the life of the seal parts of the hydraulic cylinders 37, 38, 39 into a sliding distance (amount of movement) related to the life of the seal parts. is.

The second correction coefficient calculation unit 88 sequentially (for each calculation loop) takes in the detection signal of the temperature T of the hydraulic oil detected by the temperature sensor 62, and corresponds to the taken temperature T based on the table for the second correction coefficient Ct. It calculates the second correction coefficient Ct. The second correction coefficient calculator 88 outputs the second correction coefficient Ct as the calculation result to the correction coefficient determiner 90 . In the table for the second correction coefficient Ct, for example, the second correction coefficient Ct is set to 1 when the temperature T of the hydraulic oil is lower than a predetermined value (when the temperature is low), and when the temperature T is equal to or higher than the predetermined value ( high temperature), the second correction coefficient Ct is set to increase in proportion to T.

The temperature T of the hydraulic oil supplied to the hydraulic cylinders 37 , 38 , 39 is one of the factors that affect material deterioration (service life) of the piston seal 50 and rod seal 47 . Therefore, the second correction coefficient Ct is intended to convert the influence of the hydraulic oil temperature T on the life of the seal parts of the hydraulic cylinders 37, 38, 39 into a sliding distance (amount of movement) related to the life of the seal parts. It is what I did.

The third correction coefficient calculator 89 sequentially (per calculation loop) calculates the third correction coefficient Cp corresponding to the pressure P selected by the pressure selector 86 based on the table for the third correction coefficient Cp. The third correction coefficient calculator 89 outputs the third correction coefficient Cp of the calculation result to the correction coefficient determiner 90 . In the table for the third correction coefficient Cp, for example, when the pressure P in the hydraulic cylinders 37, 38, 39 is less than a predetermined value, the third correction coefficient Cp is set to 1, and when the pressure P is equal to or higher than the predetermined value is set so that the third correction coefficient Cp increases in proportion to P.

The pressure P (P1 or P2) in the bottom chamber or rod chamber of each hydraulic cylinder 37, 38, 39 is one of the factors that affect the service life of the piston seal 50 and rod seal 47. Therefore, the third correction coefficient Cp is used to determine the effect of the pressure P in each hydraulic cylinder 37, 38, 39 on the service life of the sealing parts of the hydraulic cylinders 37, 38, 39 by the sliding distance (movement amount) related to the service life of the sealing parts. ).

The correction coefficient determination unit 90 determines the first correction coefficient Cx that is the calculation result of the first correction coefficient calculation unit 87, the second correction coefficient Ct that is the calculation result of the second correction coefficient calculation unit 88, and the third correction coefficient calculation unit 89. Among the third correction coefficients Cp that are the calculation results of (1), the largest correction coefficient is selected sequentially (for each calculation loop) and determined as the correction coefficient C used for the calculation of the cumulative movement amount calculation section 83A. That is, the correction coefficient determination unit 90 determines the correction coefficient C based on the following equation (6).
C=MAX(Cx, Ct, Cp) (6)

The cumulative movement amount calculation unit 83A sequentially corrects the absolute value Δxa of the displacement change amount, which is the calculation result of the displacement change amount calculation unit 82, using the correction coefficient C determined by the correction coefficient determination unit 90, and then calculates the hydraulic pressure. By accumulating from the time of replacement of the seal parts 50, 47 of the cylinders 37, 38, 39, the cumulative movement amount X due to expansion and contraction of the hydraulic cylinders 37, 38, 39 from the time of replacement of the seal parts 50, 47 to the time of the current calculation process is calculated. Specifically, the cumulative movement amount calculation unit 83A multiplies the absolute value Δxa of the displacement change amount, which is the calculation result of the displacement change amount calculation unit 82, by the correction coefficient C of the correction coefficient determination unit 90 for each calculation loop. By adding the value to the accumulated movement amount obtained in the previous calculation loop, the accumulated movement amount X up to the current calculation loop is calculated. That is, the cumulative movement amount calculator 83A calculates the cumulative movement amount X based on the following equation (2A).
X=X+CΔxa...(2A)

The cumulative movement amount X as a result of this calculation is determined by three factors (sliding speed of the seal parts 50 and 47, temperature T of the hydraulic oil, temperature T of the hydraulic oil, and Since the most influential factor of the pressure P) is reflected as the sliding distance (movement amount) of the seal parts, it is estimated to be larger than the actual cumulative movement amount due to expansion and contraction of the hydraulic cylinders 37, 38, and 39. be

As with the cumulative movement amount calculation section 83 of the first embodiment, the cumulative movement amount calculation section 83A sets the cumulative movement amount X of the final calculation result as an initial value X _ini at the end of a series of calculation processing. The initial value _X ini stored in the storage unit 81 and stored in the storage unit 81 at the start of a series of arithmetic processing is set as the initial value of the accumulated movement amount X.

In this manner, the cumulative movement amount X calculated by the cumulative movement amount calculation unit 83A is a movement amount that always reflects the influence of factors affecting the service life (replacement timing) of the seal component by correcting Δxa. It's becoming

Next, an example of the arithmetic processing procedure executed by the control device in the construction machine according to the second embodiment of the present invention will be described with reference to FIGS. 7 and 8. FIG. A description of the same arithmetic processing procedure as in the first embodiment will be omitted.

A series of arithmetic processing of the control device 70A shown in FIG. 8 is basically executed for each operating cycle of the hydraulic excavator 1 from start to stop of the engine of the excavator 1 (steps S10 to S100). When the operation cycle of the hydraulic excavator 1 is performed many times, the series of calculation processes (steps S10 to S100) shown in FIG. 8 are repeated many times accordingly.

The main difference between the series of arithmetic processing procedures by the control device 70A of the second embodiment shown in FIG. 8 and the series of arithmetic processing procedures by the control device 70 of the first embodiment shown in FIG. Regarding the calculation of the movement amount X, correction corresponding to the movement speed of the hydraulic cylinders 37, 38, and 39 and the temperature T and pressure P of the hydraulic oil that affect the life (replacement timing) of the seal parts is performed. Specifically, steps S20A, S32, S34, and S40A among steps S10 to S110 of the arithmetic processing procedure of the present embodiment shown in FIG. 8 are the same as those of the arithmetic processing procedure of the first embodiment shown in FIG. is different. Other steps S10, S30, S50 to S110 are the same as the arithmetic processing procedure of the first embodiment shown in FIG.

In step S20A, similarly to step S20 shown in FIG. 5 of the first embodiment, the displacement change amount calculation unit 82 of the control device 70A calculates the displacement x of the hydraulic cylinders 37, 38, and 39 from the displacement sensor 61 for each calculation loop. take in. On the other hand, unlike step S20 shown in FIG. 5 of the first embodiment, the second correction coefficient calculation unit 88 of the control device 70A takes in the temperature T of the hydraulic oil detected by the temperature sensor 62 for each calculation loop, The pressure selection unit 86 takes in the pressure P1 in the bottom chamber and the pressure P2 in the rod chamber of the hydraulic cylinders 37, 38, 39 detected by the first pressure sensor 63 and the second pressure sensor 64 for each calculation loop.

In step S32, the first correction coefficient calculator 87 uses the table for the first correction coefficient Cx to perform a first correction corresponding to the absolute value Δxa of the displacement change amount, which is the calculation result of the displacement change calculator 82 in step S30. Calculate the coefficient Cx. Further, the second correction coefficient calculator 88 calculates the second correction coefficient Ct corresponding to the temperature T read in step S20A using the table for the second correction coefficient Ct. Further, the pressure selection unit 86 selects the larger one of the pressures P1 and P2 from the first pressure sensor 63 and the second pressure sensor 64 captured in step S20A as the pressure P, and the third correction coefficient calculation unit 89 selects the A third correction coefficient Cp corresponding to the pressure P selected by the pressure selection unit 86 is calculated using the table for three correction coefficients Cp.

In step S34, the correction coefficient determination unit 90 determines the first correction coefficient Cx that is the calculation result of the first correction coefficient calculation unit 87 in step S32, the second correction coefficient Ct that is the calculation result of the second correction coefficient calculation unit 88, Among the third correction coefficients Cp that are the calculation results of the third correction coefficient calculator 89, the largest one is determined as the correction coefficient C. FIG.

In step S40A, the cumulative movement amount calculation unit 83A calculates the correction coefficient determined by the correction coefficient determination unit 90 in step S34 with respect to the absolute value Δxa of the displacement change amount calculated by the displacement change amount calculation unit 82 in step S30. The accumulated movement amount X in the current calculation loop of the count n is calculated by the above equation (2A) in which C is multiplied and added to the accumulated movement amount of the calculation result obtained in the previous calculation loop of the count n-1. This cumulative movement amount X is calculated by calculating the absolute value Δxa of the change amount of displacement sequentially calculated from the calculation loop of count 1 (first) to the current calculation loop of count n. It is obtained by adding the initial value X _ini to the integrated value after successively correcting with the correction coefficient C that reflects the influence of the factor. Therefore, the cumulative movement amount X of the calculation result affects the life (replacement time) of the seal parts 50, 47 from the time of replacement of the seal parts 50, 47 of the hydraulic cylinders 37, 38, 39 to the current calculation process. It corresponds to the cumulative movement amount of the hydraulic cylinders 37, 38, 39 reflecting the influence of factors. This cumulative movement amount X reflects the effects of factors that affect the service life (replacement timing) of the seal parts 50 and 47, so the deterioration of the seal parts 50 and 47 is greater than in the case of the first embodiment. A more accurate counterpoint of the state.

Note that, in the same manner as in the arithmetic processing of the first embodiment shown in FIG. 5, among the processing steps shown in FIG. 8, the order of steps S50 to S60 and step 70 can be exchanged or made parallel. .

In the second embodiment of the construction machine of the present invention described above, the temperature sensor 62 for detecting the temperature of hydraulic oil flowing through the hydraulic system including the hydraulic cylinders 37, 38, 39 and the pressure of the hydraulic cylinders 37, 38, 39 The control device 70A uses the largest correction coefficient C among the first correction coefficient Cx, the second correction coefficient Ct, and the third correction coefficient Cp to detect the change in the displacement of the calculation result. It is arranged to correct the quantity Δxa.

According to this configuration, the cumulative movement amount X calculated by the control device 70A reflects the influence of the factor affecting the service life (replacement timing) of the seal parts 50, 47 of the hydraulic cylinders 37, 38, 39. It is possible to more accurately predict the state of deterioration of the seal component. Therefore, it becomes possible to replace the sealing parts of the hydraulic cylinders 37, 38, 39 at a more appropriate time, and troubles of the hydraulic cylinders 37, 38, 39 can be prevented.

Next, a modified example of the second embodiment of the construction machine of the present invention will be described with reference to FIGS. 9 and 10. FIG. FIG. 9 is a block diagram showing the hardware configuration and functional configuration of the control device in the modification of the second embodiment of the construction machine of the present invention. FIG. 10 is a flow chart showing an example of an arithmetic processing procedure regarding part replacement timing by a control device forming part of the modification of the second embodiment of the construction machine of the present invention shown in FIG. In FIGS. 9 and 10, parts having the same reference numerals as those shown in FIGS. 1 to 8 are the same parts, and detailed description thereof will be omitted.

The modification of the second embodiment of the construction machine of the present invention shown in FIG. 9 differs from the second embodiment (see FIG. 7) in that the control device 70B The difference is that the function of the correction coefficient determination section 90 is not provided, and the calculation method of the cumulative movement amount calculation section 83B is different from that of the cumulative movement amount calculation section 83A of the second embodiment.

The cumulative movement amount calculation unit 83B calculates a first correction coefficient Cx that is the calculation result of the first correction coefficient calculation unit 87, a second correction coefficient Ct that is the calculation result of the second correction coefficient calculation unit 88, and a third correction coefficient calculation unit. Using the average value of the third correction coefficient Cp, which is the calculation result of 89, the displacement change amount absolute value Δxa, which is the calculation result of the displacement change amount calculation unit 82, is sequentially corrected. , 39 from the time of replacement of the seal parts 50, 47 to calculate the cumulative movement amount X due to expansion and contraction of the hydraulic cylinders 37, 38, 39 from the time of replacement of the seal parts 50, 47 to the current calculation process. is. Specifically, the cumulative movement amount calculation unit 83B applies the first correction coefficient Cx and the second correction coefficient Ct to the absolute value Δxa of the displacement change amount, which is the calculation result of the displacement change amount calculation unit 82, for each calculation loop. By adding the value obtained by multiplying the third correction coefficient Cp by the average value to the accumulated movement amount obtained in the previous calculation loop, the accumulated movement amount X up to the current calculation loop is calculated. That is, the cumulative movement amount calculator 83B calculates the cumulative movement amount X based on the following equation (2B): X=X+(Cx+Ct+Cp)/3×Δxa (2B)

The cumulative movement amount X as a result of this calculation is determined by three factors (sliding speed of seal parts, temperature T of hydraulic oil, pressure P of hydraulic oil) that affect the service life (replacement timing) of the piston seal 50 and rod seal 47. is reflected in the sliding distance (movement amount) of the seal parts, it is estimated to be longer than the actual cumulative movement amount due to expansion and contraction of the hydraulic cylinders 37, 38, and 39.

Further, the main difference between the series of arithmetic processing procedures by the control device 70B of the modified example of the second embodiment shown in FIG. 10 and the series of arithmetic processing procedures by the control device 70A of the second embodiment is that Step S34 for determining the correction coefficient C is omitted in response to the fact that the control device 70B does not have the function of the correction coefficient determination unit 90 of the second embodiment, and the cumulative movement amount calculation unit 83B The difference is that the step S40B for calculating the cumulative movement amount X by the cumulative movement amount calculation section 83B is different corresponding to the difference in the calculation method.

Specifically, in step S32, the first correction coefficient calculator 87 calculates the first correction coefficient Cx, the second correction coefficient calculator 88 calculates the second correction coefficient Ct, and the third correction coefficient calculator 89 calculates the third correction coefficient. After calculating the coefficient Cp, go to step 40B.

In step S40B, the cumulative movement amount calculation unit 83B calculates the absolute value Δxa of the displacement change amount calculated by the displacement change amount calculation unit 82 in step S30 with the first correction coefficient Cx, which is the calculation result of step S32, and the first correction coefficient Cx. The average value of the second correction coefficient Ct and the third correction coefficient Cp is multiplied and added to the accumulated movement amount obtained in the previous calculation loop of the count n-1. Calculate the cumulative movement amount X in . This cumulative movement amount X is calculated by calculating the absolute value Δxa of the change amount of displacement sequentially calculated from the calculation loop of count 1 (first) to the current calculation loop of count n. It is obtained by adding the initial value X _ini to the integrated value after successively correcting with the first correction coefficient Cx, the second correction coefficient Ct, and the third correction coefficient Cp that reflect the influence of the factor. Therefore, the cumulative movement amount X of the calculation result does not affect the life (replacement time) of the seal parts 50, 47 from the time of replacement of the seal parts 50, 47 of the hydraulic cylinders 37, 38, 39 to the time of the current calculation process. It corresponds to the cumulative amount of movement of the hydraulic cylinders 37, 38, 39 reflecting the effects of three factors (sliding speed of seal parts, temperature and pressure of hydraulic oil).

The cumulative movement amount X, which is the calculation result of the cumulative movement amount calculation unit 83A in the second embodiment, reflects the most influential factor among the first correction coefficient Cx, the second correction coefficient Ct, and the third correction coefficient Cp. It is a thing. On the other hand, the cumulative movement amount X of the calculation result by the cumulative movement amount calculation unit 83B in this modified example reflects the average of all the factors of the first correction coefficient Cx, the second correction coefficient Ct, and the third correction coefficient Cp. It will be the one that made it. The cumulative movement amount X in this modified example also reflects the effects of factors that affect the service life (replacement timing) of the seal components 50 and 47, so that the seal components 50 and 47 It is a more accurate indicator of the deterioration state of 47.

In the modified example of the second embodiment of the construction machine of the present invention described above, the temperature sensor 62 for detecting the temperature of hydraulic oil flowing through the hydraulic system including the hydraulic cylinders 37, 38, 39 and the hydraulic cylinders 37, 38, The control device 70B uses the average values of the first correction coefficient, the second correction coefficient, and the third correction coefficient to calculate the value Δxa regarding the amount of change in the displacement of the calculation result. configured to correct.

According to this configuration, the three factors affecting the service life (replacement timing) of the seal parts 50 and 47 of the hydraulic cylinders 37, 38 and 39 are reflected in the cumulative movement amount X calculated by the control device 70B. It is possible to more accurately predict the state of deterioration of the seal component. Therefore, it becomes possible to replace the sealing parts of the hydraulic cylinders 37, 38, 39 at a more appropriate time, and troubles of the hydraulic cylinders 37, 38, 39 can be prevented.

Next, an embodiment of the cylinder parts replacement timing prediction system of the present invention will be described with reference to FIGS. 11 and 12. FIG. FIG. 11 is a diagram showing the configuration of an embodiment of the cylinder part replacement time prediction system of the present invention. FIG. 12 is a block diagram showing the hardware configuration and functional configuration of a server forming part of one embodiment of the cylinder part replacement time prediction system of the present invention. In FIGS. 11 and 12, the same reference numerals as those shown in FIGS. 1 to 10 denote the same parts, so detailed description thereof will be omitted.

A cylinder parts replacement timing prediction system according to the present embodiment shown in FIG. Displacement sensors 61 (61a, 61b, 61c) provided in the hydraulic excavator 1 for detecting the displacement x of the hydraulic cylinders 37, 38, 39, respectively, a temperature sensor 62 for detecting the temperature T of hydraulic oil flowing through the hydraulic system, hydraulic cylinders A first pressure sensor 63 (63a, 63b, 63c) and a second pressure sensor 64 (64a, 64b, 64c) for detecting the pressure P1 of the bottom chamber and the pressure P2 of the rod chamber of 37, 38, 39, respectively there is Further, the cylinder parts replacement timing prediction system according to the present embodiment detects displacement x detected by the displacement sensor 61, temperature T detected by the temperature sensor 62, the first pressure sensor 63 and the second pressure sensor 64, respectively. The pressure P1 and the pressure P2 thus obtained are received via the communication network 100, and based on the received displacement x, temperature T, first pressure P1, and second pressure P2, seal components provided in the hydraulic cylinders 37, 38, 39 50 and 47 (see FIGS. 2 and 3) are provided with a server 92C for performing various arithmetic processing regarding the replacement timing. The server 92C outputs the information on the calculated replacement time to the terminal device 94 as a notification device and to the monitor device 91 via the control device 70C.

A hydraulic excavator 1 according to the present embodiment including a displacement sensor 61, a temperature sensor 62, a first pressure sensor 63, and a second pressure sensor 64 has substantially the same configuration as the hydraulic excavator 1 according to the second embodiment. . The difference between the hydraulic excavator 1 according to the present embodiment and the hydraulic excavator 1 according to the second embodiment is as follows. The control device 70A (see FIGS. 6 and 7) according to the second embodiment detects the displacement x detected by the displacement sensor 61, the temperature T detected by the temperature sensor 62, the first pressure sensor 63 and the second pressure Based on the pressure P1 and the pressure P2 respectively detected by the sensor 64, various arithmetic processing regarding the replacement timing of the seal parts 50, 47 of the hydraulic cylinders 37, 38, 39 is performed, and the result of the arithmetic processing is sent to the monitor device 91 or the server 92. It outputs to On the other hand, the control device 70C according to the present embodiment does not perform various arithmetic processing regarding the replacement timing of the seal parts 50, 47 of the hydraulic cylinders 37, 38, 39, and the displacement detected by the displacement sensor 61 Displacement x, temperature T detected by temperature sensor 62, pressure P1 and pressure P2 detected by first pressure sensor 63 and second pressure sensor 64, respectively, are captured and transmitted to server 92C via communication network 100. be. Further, the control device 70C receives the calculation result of the server 92C via the communication network 100 and outputs it to the monitor device 91. FIG.

That is, the cylinder parts replacement timing prediction system according to the present embodiment is the control device 70A (see FIGS. 6 and 7) in the cylinder parts replacement timing prediction system provided in the construction machine according to the second embodiment described above. Instead, the server 92C executes various arithmetic processing related to the replacement timing of the seal parts 47, 50 of the hydraulic cylinders 37, 38, 39, which has been executed by the server 92C. Specifically, the hardware configuration of the server 92C shown in FIG. 12 is similar to the control device 70A of the second embodiment shown in FIG. A device 97 and a communication device 98 that enables communication with the outside such as the control device 70C and the terminal device 94 via the communication network 100 . The storage device 96 preliminarily stores programs and various information necessary for various kinds of arithmetic processing regarding the replacement timing of the seal parts 50, 47 of the hydraulic cylinders 37, 38, 39. FIG. The processing device 97 appropriately reads a predetermined program and various information from the storage device 96 and executes processing according to the program, thereby realizing various functions similar to those of the control device 70A of the second embodiment.

That is, the server 92C includes a storage unit 81 as a function of the storage device 96, a displacement change amount calculation unit 82 as functions executed by the processing device 97, a cumulative movement amount calculation unit 83A, a replacement time determination unit 84, a replacement time An information calculation unit 85 , a pressure selection unit 86 , a first correction coefficient calculation unit 87 , a second correction coefficient calculation unit 88 , a third correction coefficient calculation unit 89 and a correction coefficient determination unit 90 are provided. These functional units of the server 92C are the same as the functional units of the control device 70A (see FIG. 7) of the second embodiment, and will not be described here.

The communication device 98 transmits the displacement x detected by the displacement sensor 61, the temperature T detected by the temperature sensor 62, the pressure P1 and the pressure P2 detected by the first pressure sensor 63 and the second pressure sensor 64 from the control device 70C. Receive via communication network 100 . Also, the replacement time information I and the notification command as the calculation result of the server 92C are transmitted to the terminal device 94 and the control device 70C via the communication network 100. FIG.

The arithmetic processing procedure regarding the replacement timing of the seal parts 50 and 47 executed by the server 92C of the cylinder parts replacement timing prediction system according to the present embodiment indicates the arithmetic processing procedure executed by the control device 70A of the second embodiment. Since it is similar to the flow chart of FIG. 8, it will not be described here. However, the output destination of the replacement timing information I in step S60 and the notification command in step S110 shown in FIG. 8 is the terminal device 94, not the server.

As described above, the cylinder parts replacement timing prediction system according to the present embodiment uses the displacement sensor 61 for detecting the displacement x of the hydraulic cylinders 37, 38, and 39 of the hydraulic excavator (construction machine) 1, and the displacement sensor 61. The detected displacement x is received via the communication network 100, the replacement timing of the seal parts 50, 47 provided in the hydraulic cylinders 37, 38, 39 is calculated based on the received displacement x, and the calculated replacement timing is calculated. to a terminal device (informing device) 94, the server 92C calculates a value Δxa related to the amount of change in displacement based on the displacement x detected by the displacement sensor 61, and the calculated displacement When the cumulative movement amount X (integrated value) of the hydraulic cylinders 37, 38 , 39 obtained by integrating the value Δxa related to the amount of change becomes equal to or greater than the threshold value _Xth , It is configured to output information to a terminal device (notification device) 94 .

According to this configuration, the cumulative movement amount X ( integrated value ) , it is possible to accurately predict the state of deterioration of the sealing parts 50, 47. Therefore, based on the accurately predicted states of the seal parts 50 and 47, the replacement timing of the seal parts 50 and 47 is notified to the persons concerned with the hydraulic excavator (construction machine) 1, thereby enabling the hydraulic cylinders 37, 38 and 39 to The sealing parts 50, 47 can be replaced at appropriate times, and malfunctions of the hydraulic cylinders 37, 38, 39 can be prevented.

In addition, the present invention is not limited to the present embodiment, and includes various modifications. The above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the described configurations. A part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Moreover, it is also possible to add, delete, or replace a part of the configuration of each embodiment with another configuration.

For example, in the embodiment of the construction machine and the cylinder part replacement time prediction system of the present invention described above, the hydraulic excavator 1 was described as an example of the construction machine to which the present invention is applied. However, it can be widely applied to construction machines such as cranes and wheel loaders equipped with hydraulic cylinders having seal parts that need to be replaced.

Further, in the embodiment of the construction machine and the cylinder part replacement time prediction system of the present invention described above, the displacement sensors 61 (61a, 61b, 61c) for detecting the displacement of the respective hydraulic cylinders 37, 38, 39 are replaced by hydraulic cylinders. An example is shown in which sensors are installed at 37, 38, and 39 to directly detect the displacement x. However, the first displacement sensor, the second displacement sensor, and the third displacement sensor respectively detect the rotation angle of the boom 31 about the central axis of the first rotation axis (not shown) and the rotation angle of the second rotation axis 35 . A rotary potentiometer that detects the rotation angle of the arm 32 about the central axis and the rotation angle of the bucket 33 about the central axis of the third rotating shaft 36 can also be used. In this case, the first displacement sensor, the second displacement sensor, and the third displacement sensor are attached to the boom, arm, and bucket, respectively. The rotation angle detected by each displacement sensor can be converted into the displacement of each hydraulic cylinder according to the shape of the boom, arm, and bucket. Each displacement sensor may be another sensor that can directly or indirectly acquire the displacement of each hydraulic cylinder 37 , 38 , 39 .

Moreover, in the above-described second embodiment of the construction machine of the present invention and its modified example, the hydraulic excavator 1 has shown an example of a configuration in which both the temperature sensor 62 and the pressure sensors 63 and 64 are provided. However, a configuration in which the hydraulic excavator 1 includes only one of the temperature sensor 62 and the pressure sensors 63 and 64 is also possible. In this case, the control device sequentially corrects the absolute value Δxa of the amount of change in displacement of the calculation result using a correction coefficient corresponding to the sensor provided in the hydraulic excavator 1, and then integrates the absolute value Δxa, thereby calculating the cumulative movement amount X. Just do it. Even in this configuration, at least one of the factors affecting the service life (replacement timing) of the seal parts of the hydraulic cylinders 37, 38, and 39 can be reflected in the cumulative movement amount X calculated by the control device. , the deterioration state of the sealing parts can be predicted more accurately. Therefore, it becomes possible to replace the sealing parts of the hydraulic cylinders 37, 38, 39 at a more appropriate time, and troubles of the hydraulic cylinders 37, 38, 39 can be prevented.

Further, in the embodiment of the cylinder parts replacement timing prediction system of the present invention described above, the server 92C receives the seal parts of the hydraulic cylinders 37, 38, and 39 by the control device 70A in the second embodiment of the construction machine of the present invention. 47 and 50 have shown an example of a configuration having an arithmetic processing function similar to the arithmetic processing function relating to the replacement time. However, the server 92C of the cylinder part replacement timing prediction system predicts the replacement timing of the seal parts 47, 50 of the hydraulic cylinders 37, 38, 39 by the control device 70B according to the modification of the second embodiment of the construction machine of the present invention. A configuration having an arithmetic processing function similar to the arithmetic processing function related to is also possible. Further, the server 92C of the cylinder parts replacement timing prediction system performs arithmetic processing related to the replacement timing of the seal parts 47, 50 of the hydraulic cylinders 37, 38, 39 by the control device 70 according to the first embodiment of the construction machine of the present invention. A configuration having an arithmetic processing function similar to the function is also possible. That is, the server 92C of the cylinder parts replacement time prediction system has the same arithmetic processing function as the arithmetic processing function of any one of the control devices 70, 70A, and 70B according to the first and second embodiments and their modifications. configuration is possible.

In the above-described embodiment of the construction machine of the present invention, the displacement x of each hydraulic cylinder 37, 38, 39 detected by each displacement sensor 61a, 61b, 61c is An example used for arithmetic processing related to time was shown. In the hydraulic excavator, the displacement x of each hydraulic cylinder 37, 38, 39 detected by each displacement sensor 61a, 61b, 61c is used to control the attitude of the front working machine 4 (boom 31, arm 32, bucket 33). There is something used for In such a hydraulic excavator, a displacement sensor installed in advance for attitude control of the front working machine 4 can be used for arithmetic processing of the control devices 70, 70A, and 70B. A hydraulic excavator that uses a displacement sensor to control the attitude of the front working machine can be used to implement programs necessary for various arithmetic processing related to the replacement timing of the seal parts 50 and 47 of the hydraulic cylinders 37, 38 and 39 without providing a new sensor. is newly introduced into the control device, the present invention can be applied.

DESCRIPTION OF SYMBOLS 1... Hydraulic excavator (construction machine), 4... Front work machine (work apparatus), 37... Boom cylinder (hydraulic cylinder), 38... Arm cylinder (hydraulic cylinder), 39... Bucket cylinder (hydraulic cylinder), 47... Rod seal (Seal parts) 50 Piston seal (seal parts) 61 Displacement sensor 62 Temperature sensor 63 First pressure sensor (pressure sensor) 64 Second pressure sensor (pressure sensor) 70, 70A, 70B... Control device, 91... Monitor device (notification device), 92C... Server, 94... Terminal device (notification device), 100... Communication network

Claims (6)

In a construction machine with a hydraulic cylinder with sealing parts,
a displacement sensor that detects displacement of the hydraulic cylinder;
a notification device;
A value related to the amount of change in displacement is calculated based on the displacement detected by the displacement sensor, and the value related to the amount of change in displacement is integrated, resulting in an accumulated amount of movement from the time of replacement of the seal component due to expansion and contraction of the hydraulic cylinder. and a control device that outputs a notification command to the notification device when the cumulative movement amount exceeds a threshold value. In the construction machine according to claim 1,
The control device comprises a first correction coefficient corresponding to a value related to the amount of change in displacement, a second correction coefficient corresponding to the temperature of hydraulic fluid flowing through a hydraulic system including the hydraulic cylinder, and a pressure of the hydraulic cylinder. a value relating to the amount of change in displacement is corrected using at least one correction coefficient among third correction coefficients corresponding to . In a construction machine with a hydraulic cylinder with sealing parts,
a displacement sensor that detects displacement of the hydraulic cylinder;
a notification device;
A value related to the amount of change in displacement is calculated based on the displacement detected by the displacement sensor, and a notification command is output to the notification device when an integrated value obtained by integrating values related to the amount of change in displacement exceeds a threshold value. and a controller for
The control device has a first correction coefficient corresponding to a value related to the amount of change in displacement , a second correction coefficient corresponding to the temperature of hydraulic fluid flowing through a hydraulic system including the hydraulic cylinder, and a pressure of the hydraulic cylinder. Using the largest correction coefficient among the third correction coefficients obtained , the value related to the amount of change in the displacement is corrected and integrated.
A construction machine characterized by: In a construction machine with a hydraulic cylinder with sealing parts,
a displacement sensor that detects displacement of the hydraulic cylinder;
a notification device;
A value related to the amount of change in displacement is calculated based on the displacement detected by the displacement sensor, and a notification command is output to the notification device when an integrated value obtained by integrating values related to the amount of change in displacement exceeds a threshold value. and a controller for
The control device corresponds to a first correction coefficient corresponding to the value related to the amount of change in displacement, a second correction coefficient corresponding to the temperature of hydraulic oil flowing through a hydraulic system including the hydraulic cylinder, and the pressure of the hydraulic cylinder. A construction machine characterized in that the value related to the amount of change in the displacement is corrected by using an average value of the third correction coefficient obtained and then integrated. In the construction machine according to claim 1,
The construction machine, wherein the control device calculates replacement time information indicating a margin, which is a ratio of the cumulative movement amount to the threshold value, and outputs the information to the notification device. a displacement sensor that detects the displacement of a hydraulic cylinder of a construction machine;
The displacement detected by the displacement sensor is received via a communication network, the replacement timing of the seal part provided in the hydraulic cylinder is calculated based on the received displacement, and the calculated replacement timing is output to a notification device. a server;
The server calculates a value related to the amount of change in displacement based on the displacement detected by the displacement sensor, and integrates the value related to the amount of change in displacement. and outputting information about the replacement timing of the seal part to the notification device when the cumulative travel amount exceeds a threshold value.

Images