Shaft coupling diagnosis device and shaft coupling diagnosis method

Abstract

To easily and precisely diagnose a state of wear of a shaft coupling.SOLUTION: A shaft coupling diagnosis device 1 diagnoses a wear state of a shaft coupling 80 which connects a drive shaft 61 that outputs power of a prime mover 60 and a driven shaft 71 of a driven machine 70 that is driven by transmission of the power from the drive shaft 61. The shaft coupling diagnosis device 1 comprises: an operating sound acquisition portion 12 acquiring an operating sound of the prime mover 60 when rotation speed of the prime mover 60 is changed; a feature quantity extraction portion 13 extracting an abnormal sound component contained in the operating sound acquired by the operating sound acquisition portion 12 as a feature quantity; a wear model acquisition portion 14 acquiring a wear model showing a relationship between the abnormal sound component and a wear state; and a wear condition diagnosis portion 15 diagnosing a wear state of the shaft coupling 80 based on the abnormal sound component extracted by the feature quantity extraction portion 13 and the wear model acquired by the wear model acquisition portion 14.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a shaft coupling diagnosis device and a shaft coupling diagnosis method.

Background Art

[0002] Construction machinery is equipped with a shaft coupling that connects a drive shaft (for example, the output shaft of an engine) that outputs the power of a prime mover (for example, an engine) and a driven shaft (for example, the rotating shaft of a hydraulic pump) of a driven machine (for example, a hydraulic pump) that is driven when the power is transmitted from the drive shaft of the prime mover.

[0003] As a shaft coupling mounted on construction machinery, there are many shaft couplings (also referred to as "elastic body shaft couplings") that transmit the power output from the drive shaft of the prime mover to the driven shaft of the driven machine via an elastic body. This type of shaft coupling can absorb misalignment between the central axis of the drive shaft and the central axis of the driven shaft, torque fluctuations of the prime mover, etc. by elastic deformation of the elastic body, so smooth torque transmission between the prime mover and the driven machine becomes possible.

[0004] In a shaft coupling, the elastic body wears due to aging deterioration, deformation due to fatigue, etc. When the elastic body wears, it becomes difficult to transmit torque smoothly between the prime mover and the driven machine, and in some cases, failures such as shaft breakage may occur. Therefore, it is desirable to diagnose the wear condition of the shaft coupling and replace the elastic body at an appropriate timing.

[0005] As a method for diagnosing the wear condition of a shaft coupling, a method of disconnecting the connection between the prime mover and the driven machine, disassembling the shaft coupling, and diagnosing the elastic body can be considered. However, this diagnosis method requires complicated operations such as removing hydraulic piping etc. attached to the driven machine when disconnecting the connection between the prime mover and the driven machine, attaching the piping after diagnosis, and operating oil treatment operations. In addition, this diagnosis method requires preparation of crane equipment for lifting the driven machine, and the working location is also limited. Therefore, even if this diagnosis method can accurately diagnose the wear condition of the shaft coupling, there is room for improvement from the viewpoints of workability and cost etc.

[0006] On the other hand, Patent Document 1 discloses a method for diagnosing the life of an elastic body by providing diagnostic protrusions on the outer peripheral surface of the elastic body of a shaft coupling. In the method disclosed in Patent Document 1, when the elastic body wears, by utilizing the fact that the driving shaft side block and the driven shaft side block engaged with the elastic body approach and press the protrusions, it is visually recognized whether the protrusions are broken, thereby determining whether it is necessary to replace the elastic body.

[0007] Also, Patent Document 2 discloses a method for diagnosing the deterioration of a shaft coupling by providing a rotary piece made of a shape memory alloy designed and manufactured to deform into a predetermined shape when the temperature exceeds a set temperature, and measuring the degree of deformation of the rotary piece. In the method disclosed in Patent Document 2, by utilizing the phenomenon that the sliding portion in the shaft coupling becomes poorly lubricated and generates heat due to deterioration of a seal or the like or insufficient oil supply in the sliding portion, it is detected whether the temperature of the sliding portion has abnormally risen.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0009] However, in the methods disclosed in these patent documents, in any case, only when the wear situation of the shaft coupling reaches a serious stage, for example, only when it reaches a serious stage where the driving shaft side block and the driven shaft side block engaged with the elastic body approach, the wear situation of the shaft coupling can be diagnosed. In the methods disclosed in these patent documents, before taking measures against the wear of the shaft coupling, there is a possibility that failures such as shaft breakage may occur. Therefore, a technique for easily and precisely diagnosing the wear situation of the shaft coupling is required.

[0010] In view of the above circumstances, an object of the present invention is to easily and precisely diagnose the wear condition of a shaft coupling.

Means for Solving the Problem

[0011] In order to solve the above problems, a shaft coupling diagnosis device according to the present invention is a shaft coupling diagnosis device for diagnosing the wear condition of a shaft coupling that connects a drive shaft that outputs the power of a prime mover and a driven shaft of a driven machine that is driven by the transmission of the power from the drive shaft, and includes an operating sound acquisition unit that acquires the operating sound of the prime mover when the rotational speed of the prime mover is changed, a feature amount extraction unit that extracts an abnormal sound component included in the operating sound acquired by the operating sound acquisition unit as a feature amount, a wear model acquisition unit that acquires a wear model indicating the relationship between the abnormal sound component and the wear condition, and a wear condition diagnosis unit that diagnoses the wear condition based on the abnormal sound component extracted by the feature amount extraction unit and the wear model acquired by the wear model acquisition unit.

[0012] A shaft coupling diagnosis method according to the present invention is a shaft coupling diagnosis method for diagnosing the wear condition of a shaft coupling that connects a drive shaft that outputs the power of a prime mover and a driven shaft of a driven machine that is driven by the transmission of the power from the drive shaft, and includes acquiring the operating sound of the prime mover when the rotational speed of the prime mover is changed, extracting an abnormal sound component included in the acquired operating sound as a feature amount, and diagnosing the wear condition based on a wear model indicating the relationship between the abnormal sound component and the wear condition and the abnormal sound component extracted as the feature amount.

Advantages of the Invention

[0013] According to the present invention, the wear condition of the shaft coupling can be easily and precisely diagnosed.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

BEST MODE FOR CARRYING OUT THE INVENTION

[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings. For components denoted by the same reference numerals in each embodiment, unless otherwise specified, they have the same functions in each embodiment, and the description thereof will be omitted.

[0016] [Embodiment 1] The shaft coupling diagnostic apparatus 1 according to Embodiment 1 will be described with reference to Figs. 1 to 5.

[0017] Fig. 1 is an exploded perspective view schematically showing the configuration of the shaft coupling 80.

[0018] The shaft coupling 80 is a shaft coupling that connects a drive shaft 61 (for example, the output shaft of an engine) that outputs the power of a prime mover 60 (for example, an engine) and a driven shaft 71 (for example, the rotating shaft of a hydraulic pump) of a driven machine 70 (for example, a hydraulic pump) that is driven when the power is transmitted from the drive shaft 61.

[0019] The shaft coupling 80 shown in FIG. 1 is an elastic body shaft coupling that transmits the power output from the drive shaft 61 of the prime mover 60 to the driven shaft 71 of the driven machine 70 via the elastic body 85. The shaft coupling 80 absorbs the displacement between the central axis of the drive shaft 61 and the central axis of the driven shaft 71, as well as torque fluctuations of the prime mover 60, etc., by elastic deformation of the elastic body 85. The shaft coupling 80 is an elastic body shaft coupling mounted on construction machinery such as a hydraulic excavator.

[0020] The shaft coupling 80 includes a drive shaft side block 81, a hub member 82, a driven shaft side block 83, and an elastic body 85.

[0021] The drive shaft side block 81 is formed as a substantially fan-shaped block body. A plurality of drive shaft side blocks 81 are fixed to the flywheel 62 provided on the drive shaft 61 at intervals in the circumferential direction by screws or the like. On both circumferential sides of the outer diameter side of the drive shaft side block 81, flange portions 81a extending in the circumferential direction are provided respectively. The flange portions 81a regulate the radial displacement of the elastic body 85.

[0022] The hub member 82 is formed as a thick-walled cylindrical body. The hub member 82 is fixed to the outer peripheral surface of the driven shaft 71 by spline coupling.

[0023] The driven shaft side block 83 is formed as a substantially fan-shaped block body. A plurality of driven shaft side blocks 83 are fixed to the outer peripheral surface of the hub member 82 at intervals in the circumferential direction by screws or the like. The driven shaft side block 83 is provided so as to project radially outward from the outer peripheral surface of the hub member 82. On both circumferential sides of the outer diameter side of the driven shaft side block 83, flange portions 83a extending in the circumferential direction are provided respectively. The flange portions 83a regulate the radial displacement of the elastic body 85.

[0024] The elastic body 85 is formed as a thick cylindrical body made of rubber or the like. The inner peripheral surface of the elastic body 85 defines a housing portion 86 that houses the hub member 82. On the outer peripheral surface of the elastic body 85, a drive shaft side engaging portion 87 that engages with the drive shaft side block 81 and a driven shaft side engaging portion 88 that engages with the driven shaft side block 83 are alternately formed at intervals in the circumferential direction. The drive shaft side engaging portion 87 and the driven shaft side engaging portion 88 are formed in a groove shape that is recessed radially inward from the outer peripheral surface of the elastic body 85. The portion between the drive shaft side engaging portion 87 and the driven shaft side engaging portion 88 is a compression portion 89 that is compressed in the circumferential direction by the drive shaft side block 81 and the driven shaft side block 83.

[0025] The compression portion 89 of the elastic body 85 wears due to aging deterioration, deformation due to fatigue, etc., and the thickness in the circumferential direction decreases. Then, the flange portion 81a of the drive shaft side block 81 and the flange portion 83a of the driven shaft side block 83 approach each other. The compression portion 89 of the elastic body 85 further wears, and the thickness in the circumferential direction decreases. As the wear of the elastic body 85 progresses in this way, eventually the flange portion 81a and the flange portion 83a come into contact with each other, and failures such as shaft breakage occur. Therefore, it is important to diagnose the wear condition of the shaft joint 80, and it is desirable to replace the elastic body 85 at an appropriate timing.

[0026] FIG. 2 is a block diagram showing the functional configuration of the shaft joint diagnostic device 1 according to Embodiment 1.

[0027] The shaft joint diagnostic device 1 is a device that diagnoses the wear condition of the shaft joint 80. Specifically, the shaft joint diagnostic device 1 is a device that diagnoses the wear condition of the elastic body 85 included in the shaft joint 80 from the operating sound of the prime mover 60 connected to the shaft joint 80.

[0028] The shaft coupling diagnosis device 1 is provided in a mobile terminal 10 such as a smartphone, a tablet terminal, a mobile phone, or a PDA (Personal Data Assistant). The mobile terminal 10 includes a CPU (Central Processing Unit) that performs arithmetic processing, a ROM (Read Only Memory) as a secondary storage device that stores a program describing the arithmetic processing procedure, and a RAM (Random Access Memory) as a primary storage device that stores the progress of arithmetic operations and temporary control variables. The shaft coupling diagnosis device 1 is configured by the above-mentioned CPU etc. provided in the mobile terminal 10, and various functions of the shaft coupling diagnosis device 1 are realized when the CPU executes the program.

[0029] The shaft coupling diagnosis device 1 includes a machine information acquisition unit 11, an operating sound acquisition unit 12, a feature amount extraction unit 13, a wear model acquisition unit 14, a wear condition diagnosis unit 15, and a diagnosis result output unit 16.

[0030] The machine information acquisition unit 11 acquires information on the shaft coupling 80 to be diagnosed. Specifically, the machine information acquisition unit 11 acquires information for identifying the model of the shaft coupling 80 determined according to the structure of the shaft coupling 80. The machine information acquisition unit 11 can acquire information for identifying the model of the shaft coupling 80 by the user inputting the model of the shaft coupling 80 or the construction machine from the screen of the mobile terminal 10.

[0031] The operating sound acquisition unit 12 is constituted by a microphone built in the mobile terminal 10. The operating sound acquisition unit 12 acquires (records) the operating sound of the prime mover 60. The operating sound acquisition unit 12 outputs the acquired operating sound to the feature amount extraction unit 13. The position for acquiring the operating sound of the prime mover 60 is not particularly limited, but it is preferably a position close to the construction machine on which the shaft coupling 80 is mounted.

[0032] The operating sound acquisition unit 12 acquires the operating sound of the prime mover 60 when the rotational speed of the prime mover 60 is changed. Specifically, the operating sound acquisition unit 12 acquires the operating sound when the construction machine during operation at the lowest rotational speed (during low idle) is turned off. When the construction machine during operation at the lowest rotational speed is turned off, the rotational speed of the prime mover 60 changes from the lowest rotational speed to 0. In this case, the amplitude of the operating sound of the prime mover 60 shows different waveforms according to the wear condition of the shaft coupling 80. Details of the operating sound of the prime mover 60 will be described later with reference to FIGS. 3(a) and 3(b).

[0033] The feature amount extraction unit 13 extracts an abnormal sound component included in the operating sound acquired by the operating sound acquisition unit 12 as a feature amount for specifying the wear condition of the shaft coupling 80. The abnormal sound component can be generated by changing the rotational speed of the prime mover 60 in a situation where the shaft coupling 80 is worn. Specifically, the feature amount extraction unit 13 extracts, as an abnormal sound component, the amplitude of the operating sound exceeding a predetermined threshold value during the period from when the construction machine is turned off until the amplitude of the operating sound of the prime mover 60 converges. The operating sound including the abnormal sound component is a sound that sounds like "clattering" during the period from when the construction machine is turned off until the amplitude of the operating sound of the prime mover 60 converges. The feature amount extraction unit 13 outputs the extracted abnormal sound component to the wear condition diagnosis unit 15. Details of the abnormal sound component will be described later with reference to FIGS. 3(a) and 3(b).

[0034] The wear model acquisition unit 14 acquires a wear model indicating the relationship between the abnormal sound component of the operating sound of the prime mover 60 and the wear condition of the shaft coupling 80. Specifically, the wear model acquisition unit 14 acquires a wear model indicating the relationship between the wear amount of the elastic body 85 included in the shaft coupling 80 and the generation interval (time interval) of the abnormal sound component. The wear model may be a mathematical model that describes the relationship between the wear amount of the elastic body 85 and the generation interval of the abnormal sound component. The wear model acquisition unit 14 acquires a wear model corresponding to the model of the shaft coupling 80 specified by the information based on the information of the shaft coupling 80 acquired by the machine information acquisition unit 11. The wear model acquisition unit 14 may acquire the wear model by reading a wear model registered in advance in a database or the like. The wear model acquisition unit 14 may acquire the wear model by generating a wear model from experimentally stored data or the like in advance. The wear model acquisition unit 14 outputs the acquired wear model to the wear condition diagnosis unit 15. Details of the wear model will be described later with reference to FIG. 4.

[0035] The wear condition diagnosis unit 15 diagnoses the wear condition of the shaft coupling 80 based on the abnormal sound component extracted by the feature quantity extraction unit 13 and the wear model acquired by the wear model acquisition unit 14. Specifically, the wear condition diagnosis unit 15 estimates the wear amount of the elastic body 85 by applying the occurrence interval of the abnormal sound component extracted by the feature quantity extraction unit 13 to the wear model acquired by the wear model acquisition unit 14. The wear condition diagnosis unit 15 may determine the risk level of the shaft coupling 80 according to the estimated wear amount. The wear condition diagnosis unit 15 outputs a diagnosis result of the wear condition including the estimation result of the wear amount and the determination result of the risk level to the diagnosis result output unit 16. The output method of the diagnosis result of the wear condition may be a method of outputting a number indicating the value of the wear amount, or a method of outputting a graph representing time on the horizontal axis (X-axis) and an index of the wear amount on the vertical axis (Y-axis). In the case of the method of outputting a graph, the display format of the graph is not particularly limited, and may be, for example, a line graph or a bar graph. In the case of the method of outputting a graph, it is possible to easily predict the progress of wear according to the passage of time. Usually, the risk of failure due to wear increases with the passage of time. Therefore, for example, it is conceivable to notify text messages such as "replacement recommended time", "replacement required", and "key inspection" in ascending order of the elapsed time. Alternatively, it is not limited to text messages, and it may be a notification with an icon of a running light display (blue, yellow, red) according to the progress of the failure risk. The timing of the notification can be arbitrarily set.

[0036] The diagnosis result output unit 16 outputs the diagnosis result output by the wear condition diagnosis unit 15. For example, the diagnosis result output unit 16 outputs the diagnosis result to the screen of the mobile terminal 10 and notifies the user of the diagnosis result by displaying the diagnosis result on the screen of the mobile terminal 10. Further, the diagnosis result output unit 16 may transmit it to the server device 30 communicably connected to the mobile terminal 10.

[0037] FIG. 3(a) is a diagram showing the operating sound of the prime mover 60 when the wear of the shaft coupling 80 has not progressed. FIG. 3(b) is a diagram showing the operating sound of the prime mover 60 when the wear of the shaft coupling 80 has progressed to a certain extent. Each vertical axis in FIGS. 3(a) and 3(b) indicates the amplitude of the operating sound of the prime mover 60. Each horizontal axis in FIGS. 3(a) and 3(b) indicates time.

[0038] When the wear of the shaft coupling 80 has not progressed, as shown in FIG. 3(a), in the period before the time point T1 when the construction machine is turned off, the amplitude of the operating sound of the prime mover 60 is generally constant except for fluctuations due to noise or the like. After the time point T1 of turning off, the amplitude of the operating sound of the prime mover 60 gradually decreases and converges at the time point T2. After the time point T2, the amplitude of the operating sound of the prime mover 60 remains convergent and is generally constant. The time point T2 when the amplitude of the operating sound of the prime mover 60 converges indicates the time point when the operating sound is silenced.

[0039] The operating sound acquisition unit 12 acquires the operating sound of the prime mover 60 over a period including a period Te from the time point T1 when the construction machine is turned off to the time point T3 after a predetermined time has elapsed after the time point T2 when the amplitude of the operating sound of the prime mover 60 converges.

[0040] When the wear of the shaft coupling 80 has progressed to a certain extent, as shown in FIG. 3(b), in the period before the time point T1 when the construction machine is turned off, the amplitude of the operating sound of the prime mover 60 is generally constant as in the case of FIG. 3(a). After the time point T2, the amplitude of the operating sound of the prime mover 60 is generally constant as in the case of FIG. 3(a). On the other hand, in the period Tc from the time point T1 of turning off to the time point T2 when the amplitude of the operating sound converges, peaks P1 to P6 indicating abnormal sound components occur in the amplitude of the operating sound of the prime mover 60. Peaks P1 to P6 are the amplitudes of the operating sound exceeding a predetermined threshold value. This threshold value can be calculated in advance by experiments or the like.

[0041] When the construction machine is turned off at time point T1, the feature extraction unit 13 cuts out the operating sound during the period Te from the time point T2 when the amplitude of the operating sound of the prime mover 60 converges until the time point T3 after a predetermined time has elapsed from the operating sound acquired by the operating sound acquisition unit 12. Then, the feature extraction unit 13 extracts the amplitude (peaks P1 to P6) of the operating sound that exceeds a predetermined threshold value during the period Tc from the time point T1 when the construction machine is turned off until the amplitude of the operating sound of the prime mover 60 converges, as abnormal sound components. Note that the feature extraction unit 13 may extract the amplitude of the operating sound that is equal to or less than the predetermined threshold value during the period Tc as normal sound components and output them to the wear condition diagnosis unit 15.

[0042] FIG. 4 is a diagram for explaining the wear model. The vertical axis of FIG. 4 indicates the average value of the occurrence intervals of the abnormal sound components. The horizontal axis of FIG. 4 indicates the wear amount of the elastic body 85 included in the shaft coupling 80.

[0043] As shown in FIG. 4, it can be seen that as the wear amount of the elastic body 85 increases, the occurrence interval (time interval) of the abnormal sound components becomes larger. The wear model can be described as an approximate formula of a graph as shown in FIG. 4 showing the relationship between the wear amount of the elastic body 85 and the occurrence interval of the abnormal sound components. The wear model acquisition unit 14 acquires a wear model as shown in FIG. 4 according to the model of the shaft coupling 80. The wear condition diagnosis unit 15 can estimate the wear amount of the elastic body 85 included in the shaft coupling 80 by substituting the occurrence interval of the abnormal sound components extracted by the feature extraction unit 13 into the approximate formula of the graph as shown in FIG. 4.

[0044] FIG. 5 is a flowchart showing a shaft coupling diagnosis method using the shaft coupling diagnosis device 1 shown in FIG. 2.

[0045] First, the user activates the application software of the shaft coupling diagnosis device 1 installed on the mobile terminal 10. The shaft coupling diagnosis device 1 displays on the screen of the mobile terminal 10 a diagnosis procedure for prompting the preparation of the construction machine so that the prime mover 60 operates at the minimum rotational speed. The shaft coupling diagnosis device 1 displays on the screen of the mobile terminal 10 a form for inputting the type of the shaft coupling 80 to be diagnosed or the type of the construction machine. The user performs the preparation of the construction machine and inputs the type of the shaft coupling 80 or the type of the construction machine from the screen of the mobile terminal 10.

[0046] In step S101, the shaft coupling diagnosis device 1 obtains information for specifying the type of the shaft coupling 80 by the user inputting the type of the shaft coupling 80 or the type of the construction machine from the screen of the mobile terminal 10. The shaft coupling diagnosis device 1 displays on the screen of the mobile terminal 10 a diagnosis procedure for prompting to obtain the operating sound of the prime mover 60 at an optimal position for obtaining the operating sound. The user moves the mobile terminal 10 according to the diagnosis procedure displayed on the screen of the mobile terminal 10.

[0047] In step S102, the shaft coupling diagnosis device 1 obtains a wear model corresponding to the type of the shaft coupling 80 specified by the information based on the information for specifying the type of the shaft coupling 80 obtained.

[0048] In step S103, the shaft coupling diagnosis device 1 obtains the operating sound when the construction machine with the prime mover 60 operating at the minimum rotational speed is turned off. The shaft coupling diagnosis device 1 displays on the screen of the mobile terminal 10 a diagnosis procedure for prompting to obtain the operating sound of the prime mover 60 over a period including the period Te. The user turns off the construction machine and obtains the operating sound according to the diagnosis procedure displayed on the screen of the mobile terminal 10.

[0049] In step S104, the shaft coupling diagnosis device 1 cuts out the operating sound in the period Te from the obtained operating sound. Then, the shaft coupling diagnosis device 1 extracts, as abnormal sound components, the amplitudes of the operating sound exceeding a predetermined threshold in the period Tc among the cut-out operating sound.

[0050] In step S105, the shaft coupling diagnosis device 1 diagnoses the wear condition of the shaft coupling 80 based on the extracted abnormal sound components and the obtained wear model. Specifically, the shaft coupling diagnosis device 1 calculates the occurrence interval of the extracted abnormal sound components. The shaft coupling diagnosis device 1 estimates the wear amount of the elastic body 85 included in the shaft coupling 80 by applying the calculated occurrence interval of the abnormal sound components to the obtained wear model.

[0051] In step S106, the shaft coupling diagnosis device 1 outputs the diagnosis result to the screen of the mobile terminal 10 to notify the user. The shaft coupling diagnosis method shown in FIG. 5 ends.

[0052] Note that the shaft coupling diagnosis device 1 may change the order of performing step S102 as long as it is between step S101 and step S105.

[0053] As described above, the shaft coupling diagnosis device 1 of Embodiment 1 is a device that diagnoses the wear condition of the shaft coupling 80 that connects the drive shaft 61 that outputs the power of the prime mover 60 and the driven shaft 71 of the driven machine 70 that is driven when the power is transmitted from the drive shaft 61. The shaft coupling diagnosis device 1 includes an operating sound acquisition unit 12 that acquires the operating sound of the prime mover 60 when the rotational speed of the prime mover 60 is changed. The shaft coupling diagnosis device 1 includes a feature amount extraction unit 13 that extracts, as a feature amount, the abnormal sound components included in the operating sound acquired by the operating sound acquisition unit 12. The shaft coupling diagnosis device 1 includes a wear model acquisition unit 14 that acquires a wear model indicating the relationship between the abnormal sound components and the wear condition. The shaft coupling diagnosis device 1 includes a wear condition diagnosis unit 15 that diagnoses the wear condition of the shaft coupling 80 based on the abnormal sound components extracted by the feature amount extraction unit 13 and the wear model acquired by the wear model acquisition unit 14.

[0054] With this configuration, the shaft coupling diagnosis device 1 can diagnose the wear condition of the shaft coupling 80 without disconnecting the connection between the prime mover 60 and the driven machine 70 and disassembling the shaft coupling 80. Furthermore, even before the wear condition of the shaft coupling 80 reaches a serious stage, the shaft coupling diagnosis device 1 can utilize the occurrence of abnormal sound components in the operating sound of the prime mover 60 to diagnose the wear condition of the shaft coupling 80 from a stage where the wear is minor. Therefore, the shaft coupling diagnosis device 1 can easily and precisely diagnose the wear condition of the shaft coupling.

[0055] Furthermore, in the shaft coupling diagnosis device 1, the shaft coupling 80 may be an elastic shaft coupling mounted on a construction machine. The operating sound acquisition unit 12 acquires the operating sound when the construction machine with the prime mover 60 operating at the minimum rotational speed is turned off. The feature quantity extraction unit 13 extracts, as abnormal sound components, the amplitudes of the operating sound that exceed a predetermined threshold value during the period Tc from when the construction machine is turned off until the amplitude of the operating sound converges.

[0056] Thereby, the shaft coupling diagnosis device 1 can stably acquire the operating sound of the prime mover 60 by always setting the states of the prime mover 60, the driven machine 70, and the shaft coupling 80 to the same conditions when diagnosing the shaft coupling 80. In addition, the shaft coupling diagnosis device 1 can clearly distinguish whether the operating sound of the prime mover 60 contains abnormal sound components caused by the wear of the shaft coupling 80, and can accurately extract only the abnormal sound components. Therefore, the shaft coupling diagnosis device 1 can not only easily and precisely diagnose the wear condition of the shaft coupling 80, but also accurately and stably diagnose it.

[0057] Furthermore, the wear model acquisition unit 14 acquires a wear model showing the relationship between the wear amount of the elastic body 85 included in the shaft coupling 80 and the occurrence interval of abnormal sound components. The wear condition diagnosis unit 15 estimates the wear amount of the elastic body 85 by applying the occurrence interval of the abnormal sound components extracted by the feature quantity extraction unit 13 to the wear model acquired by the wear model acquisition unit 14.

[0058] As a result, the shaft coupling diagnostic device 1 can quantitatively represent the degree of wear of the elastic body 85 by a relatively simple method, so that it can detect a sign of an abnormality occurring in the shaft coupling 80. Therefore, the shaft coupling diagnostic device 1 can not only diagnose the wear condition of the shaft coupling 80 more precisely, but also optimize the maintenance plan of the shaft coupling 80 such as the replacement timing of the elastic body 85. The shaft coupling diagnostic device 1 can significantly shorten the downtime of the construction machine and improve the productivity of the construction machine.

[0059] Furthermore, the operating sound acquisition unit 12, the feature quantity extraction unit 13, the wear model acquisition unit 14, and the wear condition diagnosis unit 15 may be provided in the mobile terminal 10.

[0060] As a result, the shaft coupling diagnostic device 1 can easily diagnose the wear condition of the shaft coupling 80 by anyone at the work site. Therefore, the shaft coupling diagnostic device 1 can diagnose the wear condition of the shaft coupling 80 more easily.

[0061] In addition, the shaft coupling diagnosis method of Embodiment 1 is a shaft coupling diagnosis method for diagnosing the wear condition of a shaft coupling 80 that connects a drive shaft 61 that outputs the power of a prime mover 60 and a driven shaft 71 of a driven machine 70 that is driven by the power being transmitted from the drive shaft 61. The shaft coupling diagnosis method includes acquiring the operating sound of the prime mover 60 when the rotational speed of the prime mover 60 is changed (step S103). The shaft coupling diagnosis method includes extracting an abnormal sound component included in the acquired operating sound as a feature quantity (step S104). The shaft coupling diagnosis method includes diagnosing the wear condition of the shaft coupling 80 based on a wear model showing the relationship between the abnormal sound component and the wear condition and the abnormal sound component extracted as a feature quantity (step S105).

[0062] Accordingly, the shaft coupling diagnosis method can diagnose the wear condition of the shaft coupling 80 without disconnecting the connection between the prime mover 60 and the driven machine 70 and disassembling the shaft coupling 80. Further, even before the wear condition of the shaft coupling 80 reaches a serious stage, the shaft coupling diagnosis method utilizes the fact that an abnormal sound component occurs in the operating sound of the prime mover 60 to diagnose the wear condition of the shaft coupling 80 from a stage where the wear is minor. Therefore, the shaft coupling diagnosis method can easily and precisely diagnose the wear condition of the shaft coupling.

[0063] Furthermore, the shaft coupling 80 may be an elastomeric shaft coupling mounted on a construction machine. Obtaining the operating sound is to obtain the operating sound when the construction machine with the prime mover 60 operating at the minimum rotational speed is turned off. Extracting the abnormal sound component is to extract, as the abnormal sound component, the amplitude of the operating sound that exceeds a predetermined threshold value during the period Tc from when the construction machine is turned off until the amplitude of the operating sound converges.

[0064] Accordingly, the shaft coupling diagnosis method can always obtain the operating sound of the prime mover 60 stably by keeping the states of the prime mover 60, the driven machine 70, and the shaft coupling 80 the same conditions when diagnosing the shaft coupling 80. In addition, the shaft coupling diagnosis method can clearly distinguish whether the operating sound of the prime mover 60 contains an abnormal sound component caused by the wear of the shaft coupling 80, and can accurately extract only the abnormal sound component. Therefore, the shaft coupling diagnosis method can not only easily and precisely diagnose the wear condition of the shaft coupling 80, but also accurately and stably diagnose it.

[0065] [Embodiment 2] The shaft coupling diagnosis apparatus 1 according to Embodiment 2 will be described with reference to FIG. 6. Regarding the same configuration and operation as in Embodiment 1 in the shaft coupling diagnosis apparatus 1 according to Embodiment 2, the description will be omitted.

[0066] FIG. 6 is a block diagram showing the functional configuration of the shaft coupling diagnosis apparatus 1 according to Embodiment 2.

[0067] In the shaft coupling diagnostic device 1 according to Embodiment 2, the machine information acquisition unit 11 and the operating sound acquisition unit 12 are provided in the mobile terminal 10. In the shaft coupling diagnostic device 1 according to Embodiment 2, the feature amount extraction unit 13, the wear model acquisition unit 14, the wear condition diagnosis unit 15, and the diagnosis result output unit 16 are provided in the server device 30 that can communicate with the mobile terminal 10.

[0068] The server device 30 includes a CPU, a ROM, and a RAM, and is installed in a management sensor or the like of a construction machine. The shaft coupling diagnostic device 1 according to Embodiment 3 is configured by the above-described CPU or the like provided in the server device 30, and the CPU executes a program to realize various functions of the shaft coupling diagnostic device 1.

[0069] The machine information acquisition unit 11 according to Embodiment 2 transmits the acquired information of the shaft coupling 80 to the wear model acquisition unit 14 provided in the server device 30. The operating sound acquisition unit 12 according to Embodiment 2 transmits the acquired operating sound of the prime mover 60 to the feature amount extraction unit 13 provided in the server device 30. The diagnosis result output unit 16 according to Embodiment 2 transmits the diagnosis result to the mobile terminal 10 to be displayed on the screen of the mobile terminal 10, or transmits the diagnosis result to the construction machine to be displayed on a display device provided in the construction machine. At this time, when an emergency response is required, only the event may be simply displayed on the mobile terminal 10 by the above-described signal lamp display function, while detailed information such as the diagnosis result may be displayed on the display device of the construction machine, and the notification destination of the diagnosis result may be different.

[0070] As described above, in the shaft coupling diagnostic device 1 according to Embodiment 2, since the feature amount extraction unit 13, the wear model acquisition unit 14, and the wear condition diagnosis unit 15 are provided in the server device 30, the processing related to these functions can be speeded up compared to Embodiment 1. Therefore, the shaft coupling diagnostic device 1 according to Embodiment 2 can diagnose the wear condition of the shaft coupling 80 more quickly than Embodiment 1. Further, by using the server device 30, the shaft coupling diagnostic device 1 can analyze the transition of the wear condition of the shaft coupling 80 and detailed wear causes, or collect the diagnosis results of the shaft couplings 80 of other construction machines to centrally manage the wear condition of the shaft coupling 80.

[0071] [Embodiment 3] The shaft coupling diagnostic device 1 according to Embodiment 3 will be described with reference to FIG. 7. In the shaft coupling diagnostic device 1 according to Embodiment 3, the description of the same configuration and operation as in Embodiment 1 will be omitted.

[0072] FIG. 7 is a block diagram showing the functional configuration of the shaft coupling diagnostic device 1 according to Embodiment 3.

[0073] In the shaft coupling diagnostic device 1 according to Embodiment 3, a machine information acquisition unit 11, an operating sound acquisition unit 12, a feature amount extraction unit 13, a wear model acquisition unit 14, a wear condition diagnosis unit 15, and a diagnosis result output unit 16 are provided in the control device 20 of the construction machine.

[0074] The control device 20 is constituted by a microcomputer combining a CPU, a ROM, and a RAM. The shaft coupling diagnostic device 1 according to Embodiment 3 is constituted by the above CPU etc. provided in the control device 20, and by the CPU executing a program, the rotational speed of the prime mover 60 can be changed, or the operating sound of the prime mover 60 can be acquired using a microphone provided in the construction machine.

[0075] In Embodiment 3, the machine information acquisition unit 11 directly acquires information on the shaft coupling 80 from the control device 20 at the start of diagnosis. The operating sound acquisition unit 12 of Embodiment 3 starts acquiring the operating sound of the prime mover 60 based on a command from the control device 20. For example, event information indicating the occurrence of key-off of the construction machine is predefined in the control device 20, and when the construction machine is keyed off, the control device 20 outputs the event information to the operating sound acquisition unit 12. When the event information is input, the operating sound acquisition unit 12 starts acquiring the operating sound. Also, the diagnosis result output unit 16 of Embodiment 3 causes the diagnosis result to be displayed on a display device provided on the construction machine, output as an alarm, or transmitted to the server device 30. Note that the notification content and destination of the diagnosis result can be arbitrarily set. That is, when urgent response is required, only the event may be simply displayed on the mobile terminal 10 by the above-mentioned pilot lamp display function, while detailed information such as the diagnosis result may be displayed on the display device of the construction machine. Also, the destination of the diagnosis result notification may be arbitrarily set according to the progress of the failure risk. For example, when there is a possibility of resolution by prompt response from an inspector at the work site, it may be possible to respond more quickly by notifying the mobile terminal 10 held by the inspector. Therefore, the urgency of the failure risk may be determined, and when the urgency is high, it may be transmitted to both the mobile terminal 10 and the server device 30, and the notification destination is not necessarily limited to one.

[0076] As described above, in the shaft coupling diagnosis device 1 of Embodiment 3, since the machine information acquisition unit 11, the operating sound acquisition unit 12, the feature amount extraction unit 13, the wear model acquisition unit 14, the wear condition diagnosis unit 15, and the diagnosis result output unit 16 are provided in the control device 20 of the construction machine, it is possible to diagnose the wear condition of the shaft coupling 80 on the construction machine side without going to the work site. Furthermore, by the control device 20 of the construction machine transmitting the diagnosis result to the server device 30 etc. together with the operation information of the construction machine, the server device 30 can analyze the transition of the wear condition of the shaft coupling 80 and the detailed wear causes, or collect the diagnosis results of the shaft couplings 80 of other construction machines to centrally manage the wear condition of the shaft couplings 80.

[0077] [Embodiment 4] The shaft coupling diagnosis device 1 according to Embodiment 4 will be described with reference to FIG. 8. In the shaft coupling diagnosis device 1 according to Embodiment 4, descriptions of the same configurations and operations as those in Embodiment 3 will be omitted.

[0078] FIG. 8 is a block diagram showing the functional configuration of the shaft coupling diagnosis device 1 according to Embodiment 4.

[0079] In the shaft coupling diagnosis device 1 according to Embodiment 4, the machine information acquisition unit 11 and the operating sound acquisition unit 12 are provided in the control device 20 of the construction machine. In the shaft coupling diagnosis device 1 according to Embodiment 4, the feature amount extraction unit 13, the wear model acquisition unit 14, the wear condition diagnosis unit 15, and the diagnosis result output unit 16 are provided in the server device 30 that can communicate with the construction machine.

[0080] The machine information acquisition unit 11 according to Embodiment 4 transmits the acquired information of the shaft coupling 80 to the server device 30. The operating sound acquisition unit 12 according to Embodiment 4 transmits the acquired operating sound of the prime mover 60 to the server device 30. The diagnosis result output unit 16 according to Embodiment 4 transmits the diagnosis result to the construction machine to be displayed on a display device provided in the construction machine, or transmits it to the mobile terminal 10 to be displayed on the screen of the mobile terminal 10.

[0081] As described above, in the shaft coupling diagnosis device 1 according to Embodiment 4, since the feature amount extraction unit 13, the wear model acquisition unit 14, and the wear condition diagnosis unit 15 are provided in the server device 30, the processing related to these functions can be speeded up compared to Embodiment 3. Therefore, the shaft coupling diagnosis device 1 according to Embodiment 4 can diagnose the wear condition of the shaft coupling 80 more quickly than Embodiment 3.

[0082] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention described in the claims. The present invention can add the configuration of one embodiment to the configuration of another embodiment, replace the configuration of one embodiment with that of another embodiment, or delete a part of the configuration of one embodiment.

Explanation of Reference Numerals

[0083] 1...Shaft joint diagnosis device, 10...Mobile terminal, 11...Mechanical information acquisition unit, 12...Operating sound acquisition unit, 13...Feature quantity extraction unit, 14...Wear model acquisition unit, 15...Wear condition diagnosis unit, 20...Control device, 30...Server device, 60...Prime mover, 61...Drive shaft, 70...Driven machine, 71...Driven shaft, 80...Shaft joint, 85...Elastomer

Claims

1. A shaft coupling diagnosis device for diagnosing the wear condition of a shaft coupling that connects a drive shaft for outputting the power of a prime mover and a driven shaft of a driven machine driven by the transmission of the power from the drive shaft, an operating sound acquisition unit that acquires the operating sound of the prime mover when the rotational speed of the prime mover is changed, a feature quantity extraction unit that extracts an abnormal sound component included in the operating sound acquired by the operating sound acquisition unit as a feature quantity, a wear model acquisition unit that acquires a wear model showing the relationship between the abnormal sound component and the wear condition, and a wear condition diagnosis unit that diagnoses the wear condition based on the abnormal sound component extracted by the feature quantity extraction unit and the wear model acquired by the wear model acquisition unit. The shaft coupling diagnosis device is characterized by the above.

2. The shaft coupling is an elastic body shaft coupling mounted on a construction machine, the operating sound acquisition unit acquires the operating sound when the construction machine in which the prime mover is operating at the minimum rotational speed is turned off, and the feature quantity extraction unit extracts, as the abnormal sound component, the amplitude of the operating sound that exceeds a predetermined threshold during the period from when the construction machine is turned off until the amplitude of the operating sound converges. The shaft coupling diagnosis device according to claim 1, characterized by the above.

3. The wear model acquisition unit acquires the wear model showing the relationship between the wear amount of the elastic body included in the shaft coupling and the occurrence interval of the abnormal sound component, and the wear condition diagnosis unit estimates the wear amount of the elastic body by applying the occurrence interval of the abnormal sound component extracted by the feature quantity extraction unit to the wear model acquired by the wear model acquisition unit. The shaft coupling diagnosis device according to claim 2, characterized by the above.

4. The operating sound acquisition unit, the feature quantity extraction unit, the wear model acquisition unit, and the wear condition diagnosis unit are provided in a portable terminal. The shaft coupling diagnosis device according to claim 1, characterized in that...

5. The operating sound acquisition unit is provided in a mobile terminal, The feature amount extraction unit, the wear model acquisition unit, and the wear condition diagnosis unit are provided in a server device capable of communicating with the mobile terminal The shaft coupling diagnosis device according to claim 1, characterized in that...

6. The shaft coupling is mounted on a construction machine, The operating sound acquisition unit, the feature amount extraction unit, the wear model acquisition unit, and the wear condition diagnosis unit are provided in the construction machine The shaft coupling diagnosis device according to claim 1, characterized in that...

7. The shaft coupling is mounted on a construction machine, The operating sound acquisition unit is provided in the construction machine, The feature amount extraction unit, the wear model acquisition unit, and the wear condition diagnosis unit are provided in a server device capable of communicating with the construction machine The shaft coupling diagnosis device according to claim 1, characterized in that...

8. A shaft coupling diagnosis method for diagnosing the wear condition of a shaft coupling that connects a drive shaft that outputs power from a prime mover and a driven shaft of a driven machine that is driven by the power being transmitted from the drive shaft, comprising: Obtaining the operating sound of the prime mover when the rotational speed of the prime mover is changed; Extracting an abnormal sound component included in the obtained operating sound as a feature amount; Diagnosing the wear condition based on a wear model showing the relationship between the abnormal sound component and the wear condition and the abnormal sound component extracted as the feature amount. The shaft coupling diagnosis method, characterized in that...

9. The shaft coupling is an elastic body shaft coupling mounted on a construction machine, The obtaining of the operating sound is to obtain the operating sound when the construction machine in which the prime mover is operating at the minimum rotational speed is turned off. The extracting of the abnormal sound component is to extract, as the abnormal sound component, the amplitude of the operating sound that exceeds a predetermined threshold value during a period from when the construction machine is turned off until the amplitude of the operating sound converges. The shaft coupling diagnosis method according to claim 8, characterized by the above.

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