Fault diagnosis device for hydraulic pump

Abstract

Embodiments of the present invention relate to a fault diagnosis device of a hydraulic pump capable of diagnosing a fault of the hydraulic pump, the hydraulic pump including a pump body, a swash plate disposed inside the pump body, a piston capable of changing a position of the swash plate, and a support plate disposed between the swash plate and the piston, the fault diagnosis device of the hydraulic pump including a rod provided in the swash plate, a sensor for detecting a vibration of the swash plate, and a shaft angle piece receiving the vibration of the swash plate from the rod and transmitting to the sensor.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to a fault diagnosis device of a hydraulic pump, and more particularly, to a fault diagnosis device of a hydraulic pump that can predict and diagnose a fault of the hydraulic pump by detecting a vibration of a swash plate and predicting a degree of wear between a support plate and a piston. BACKGROUND

[0002] Generally, a fault diagnosis of a hydraulic pump is performed by detecting a change in suction flow between a support plate and a piston. Specifically, a diagnosis method diagnoses a fault of a hydraulic pump by comparing a change in suction flow between the support plate and the piston with a preset flow and diagnosing a fault of the hydraulic pump based on information of the suction flow.

[0003] However, such a fault diagnosis does not require an accurate calculation of flow but an accurate calculation of a suction pressure that is too low between the support plate and the piston. Also, in a hydraulic pump provided in a construction machine, since suction pipes connected to front and rear sides are identical, it is difficult to determine a position where an abnormality occurs in the hydraulic pump. SUMMARY

[0004] TECHNICAL PROBLEM

[0005] Embodiments of the present application provide a fault diagnosis device of a hydraulic pump that can effectively predict and diagnose a fault of the hydraulic pump according to a degree of wear between a support plate and a piston disposed inside the hydraulic pump.

[0006] TECHNICAL SOLUTION

[0007] The fault diagnosis device of a hydraulic pump according to an embodiment of the present application can diagnose a fault of a hydraulic pump, the hydraulic pump including a pump body, a swash plate disposed inside the pump body, a piston capable of changing a position of the swash plate, and a support plate disposed between the swash plate and the piston, the fault diagnosis device of the hydraulic pump including a rod provided at the swash plate, a sensor for detecting a vibration of the swash plate, and a shaft angle piece receiving the vibration of the swash plate from the rod and transmitting to the sensor.

[0008] Also, the fault diagnosis device of the hydraulic pump can further include a housing disposed outside the pump body, the shaft angle piece being disposed inside the housing, and the sensor being supported at one side of the housing.

[0009] Also, the fault diagnosis device of the hydraulic pump can further include a bearing disposed inside the housing to support the shaft angle piece in a manner capable of rotating inside the housing.

[0010] Also, the fault diagnosis device of the hydraulic pump can further include a control portion receiving the vibration detected by the sensor and diagnosing a fault of the hydraulic pump by predicting a wear state between the piston and the support plate.

[0011] Also, the control part can remove noise from the vibration detected by the sensor based on a failure diagnosis model to predict a wear state between the piston and the support plate.

[0012] Also, the failure diagnosis model can be generated through one or more learning algorithms in deep learning or machine learning.

[0013] Effects of the Invention

[0014] According to an embodiment of the present invention, a failure diagnosis device of a hydraulic pump can effectively predict and diagnose a failure of the hydraulic pump based on a degree of wear between a support plate and a piston disposed inside the hydraulic pump. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a partial cross-sectional view to illustrate an internal portion of a hydraulic pump and a failure diagnosis device of the hydraulic pump according to an embodiment of the present invention.

[0016] Figure 2 FIG. 2 is a state diagram to illustrate a hydraulic pump provided with a failure diagnosis device of the hydraulic pump according to an embodiment of the present invention.

[0017] Figure 3 FIG. 3 is a block diagram to illustrate a structure of a failure diagnosis device of a hydraulic pump according to an embodiment of the present invention.

[0018] Explanation of Reference Numerals

[0019] 100: Hydraulic pump 101: Failure diagnosis device of the hydraulic pump

[0020] 110: Pump body 120: Swash plate

[0021] 130: Piston 140: Support plate

[0022] 200: Rod 300: Sensor

[0023] 400: Shaft angle piece 500: Housing

[0024] 600: Bearing 700: Control part

[0025] 800: Failure diagnosis model DETAILED DESCRIPTION

[0026] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings so as to be easily implemented by those skilled in the art to which the present invention pertains. The present invention can be implemented by various different embodiments, and is not limited to the embodiment described herein.

[0027] The accompanying drawings are simplified illustrations and are not shown to scale. For clarity and convenience, the relative dimensions and proportions of various parts in the drawings are shown enlarged or reduced compared to their actual size; however, these dimensions are illustrative and not limiting. Furthermore, to indicate similar features, the same reference numerals are used for the same structures, elements, or accessories shown in more than two drawings.

[0028] The embodiments of the present invention specifically illustrate ideal embodiments of the invention. Various variations of the illustrations are contemplated as a result. Therefore, the embodiments are not limited to the specific forms shown in the illustrated areas, and include, for example, manufacturing-based morphological variations.

[0029] The following is for reference Figures 1 to 3 This describes a fault diagnosis device 101 for a hydraulic pump according to an embodiment of the present invention.

[0030] like Figure 1 As shown, the hydraulic pump 100 includes a pump body 110, a swashplate 120, a piston 130, and a support plate 140. The hydraulic pump 100 transmits working oil, which is pressurized and supplied internally, to structures that use it as a driving force.

[0031] Inside the pump body 110, there is a swashplate 120, a piston 130, and a support plate 140. The piston 130 has an internal flow path, through which hydraulic pressure supplied to it can change the position of the swashplate 120. The support plate 140 connects the piston 130 and the swashplate 120, and contacts one end of the piston 130. Therefore, wear occurs between the support plate 140 and the piston 130.

[0032] like Figure 1 and Figure 2 As shown, a hydraulic pump fault diagnosis device 101 according to an embodiment of the present invention includes a rod 200, a sensor 300 and a shaft corner piece 400.

[0033] A rod 200 is disposed on a ramp 120, which moves along with changes occurring within the pump body 110. Specifically, the rod 200 may be arranged on one side of the outer periphery of the ramp 120 in a direction parallel to the length direction of the pump body 110. Specifically, the rod 200 may receive vibrations transmitted to the ramp 120 caused by abnormal wear between the piston 130 and the support plate 140.

[0034] Sensor 300 can detect the vibration of inclined plate 120. Specifically, sensor 300 can detect vibration information transmitted to inclined plate 120. As an example, sensor 300 can be disposed on the outside of pump body 110. Furthermore, sensor 300 can be an accelerometer.

[0035] The shaft angle member 400 can be disposed between the rod 200 and the sensor 300. Also, the shaft angle member 400 can receive the vibration of the swash plate 120 from the rod 200 and transmit it to the sensor 300. The shaft angle member 400 is disposed in a direction crossing the length direction of the pump body 110, and one side thereof can be connected to the rod 200. Also, the other side of the shaft angle member 400 can transmit the vibration of the swash plate 120 to the sensor 300.

[0036] Through the above-described structure, the hydraulic pump failure diagnosis apparatus 101 according to an embodiment of the present application can detect an abnormality due to wear between the support plate 140 and the piston 130 by the vibration transmitted to the swash plate 120, and thus can effectively diagnose the service life and failure of the hydraulic pump 100.

[0037] Also, the hydraulic pump failure diagnosis apparatus 101 according to an embodiment of the present application can further include a housing 500.

[0038] The housing 500 can be disposed outside the pump body 110. Also, the shaft angle member 400 can be disposed inside the housing 500. Also, the sensor 300 can be supported at one side of the housing 500.

[0039] Specifically, the sensor 300 can be supported outside the housing 500. Also, a housing hollow portion 501 can be formed inside the housing 500, and the shaft angle member 400 can be disposed in the housing hollow portion 501.

[0040] At least a portion of the other side of the shaft angle member 400 can be disposed inside the housing 500, and the vibration information of the swash plate 120 transmitted from the shaft angle member 400 can be transmitted to the sensor 300.

[0041] As an example, the rod 200 can be disposed in a manner that one side thereof is supported by the swash plate 120 and the other side thereof extends from the swash plate 120. A rod protrusion 210 can be formed at the other side of the rod 200, and protrude in a direction crossing the length direction of the rod 200.

[0042] Also, a shaft groove 401 can be formed at one side of the shaft angle member 400, and the shaft groove 401 can be engaged with the rod protrusion 210. Thus, the shaft angle member 400 can rotate as the swash plate 120 moves. The shaft angle member 400 rotates by the rod 200 moving due to the change of the swash plate 120, and can transmit the vibration of the swash plate 120 to the sensor 300.

[0043] Also, the hydraulic pump failure diagnosis apparatus 101 according to an embodiment of the present application can further include a bearing 600.

[0044] The bearing 600 can be disposed inside the housing 500 to rotatably support the shaft angle member 400.

[0045] The bearing 600 can be disposed in the housing hollow portion 501 to support the shaft angle piece 400 in a manner capable of rotating in the housing hollow portion 501.

[0046] Also, as shown in FIG. 1, the hydraulic pump failure diagnosis device 101 according to an embodiment of the present application can further include a control portion 700. Figures 1 to 3

[0047] The control portion 700 can receive the vibration detected by the sensor 300. Also, the control portion 700 can predict the wear state between the piston 130 and the support plate 140. Also, the control portion 700 can diagnose the failure of the hydraulic pump 100 based on such prediction.

[0048] Specifically, the control portion 700 can diagnose the failure of the hydraulic pump 100 based on the vibration information detected by the sensor 300 transmitted to the inclined plate 120 to predict the current wear state of the piston 130 and the support plate 140.

[0049] Also, in the hydraulic pump failure diagnosis device 101 according to an embodiment of the present application, the control portion 700 can store a failure diagnosis model 800.

[0050] The control portion 700 can predict the wear state between the piston 130 and the support plate 140 based on the failure diagnosis model 800. Also, the control portion 700 can remove the disturbance and noise of the hydraulic pump 100, etc. included in the vibration detected by the sensor 300 through such failure diagnosis model 800. Also, the control portion 700 can change and extract the state information caused by the wear between the piston 130 and the support plate 140 by removing the disturbance and noise, etc. from the vibration information detected by the sensor 300, and thus can apply it to the failure diagnosis. As an example, the control portion 700 can change and extract the abnormal vibration of the inclined plate 120 changed by the wear state between the piston 130 and the support plate 140 through signal processing such as Fast Fourier Transform (FFT), and thus can apply it to the failure diagnosis.

[0051] That is, the control portion 700 can predict the current wear state between the piston 130 and the support plate 140 based on the failure diagnosis model 800 by removing the disturbance or noise from the vibration information detected by the sensor 300. In other words, the control portion 700 can judge the abnormal vibration caused by the wear between the piston 130 and the support plate 140 by removing the noise from the vibration information detected by the sensor 300.

[0052] Also, in the hydraulic pump failure diagnosis device 101 according to an embodiment of the present application, the failure diagnosis model 800 can be generated through one or more learning algorithms among deep learning or machine learning.

[0053] ​The failure diagnosis model 800 can be a failure diagnosis learning model that is generated by learning a correlation between the vibration information of the swash plate 120 and the wear state information data information between the piston 130 and the support plate 140 due to the load and the like as the use time of the hydraulic pump 100 increases. Specifically, the failure diagnosis model 800 can learn a range of disturbance or a range of noise of different degrees based on the characteristics of the device in which the hydraulic pump 100 is installed and apply the same to the control part 700 to predict the wear state between the piston 130 and the support plate 140.

[0054] The control part 700 can predict the wear state between the piston 130 and the support plate 140 by removing the disturbance and the noise and the like from the vibration information detected by the sensor 300 through the failure diagnosis model 800, and thus can diagnose the failure of the hydraulic pump 100. Also, the failure diagnosis model 800 stores a failure diagnosis reference for judging the wear degree of the support plate 140 and the piston 130 based on the vibration information detected by the sensor 300.

[0055] Specifically, the control part 700 can diagnose the failure of the hydraulic pump 100, and thus can enable the worker to identify the failure present in the device such as the construction equipment in which the hydraulic pump 100 is installed.

[0056] Also, in the failure diagnosis device 101 of the hydraulic pump of the present application, a plurality of swash plates 120 are formed on both sides inside the hydraulic pump 100, and a plurality of rods 200, sensors 300, bearings 600, housings 500, and shaft angle pieces 400 can be provided, and thus the failure of the hydraulic pump 100 can be diagnosed by detecting the vibration of the swash plates 120.

[0057] Therefore, the failure diagnosis device 101 of the hydraulic pump of an embodiment of the present application can effectively judge the position of the swash plate 120 in which the abnormality due to the wear between the support plate 140 and the piston 130 occurs by the control part 700.

[0058] Through the above-described structure, the failure diagnosis device 101 of the hydraulic pump of an embodiment of the present application can effectively predict and diagnose the failure of the hydraulic pump 100 and the like due to the wear between the support plate 140 and the piston 130. Also, compared to the related art that diagnoses the failure of the hydraulic pump based on the internal pressure of the hydraulic pump, the failure diagnosis device 101 of the hydraulic pump of an embodiment of the present application can effectively predict the wear state between the support plate 140 and the piston 130.

[0059] Hereinabove, although the embodiments of the present application have been described with reference to the accompanying drawings, it will be understood by those of ordinary skill in the art that the present application can be embodied in other specific forms without changing the technical idea or essential characteristics of the present application.

[0060] Therefore, it must be understood that the above-described embodiments are merely illustrative of the application and should not be considered limiting in any respect, and the scope of the application should be determined by the appended claims, rather than the above description, and all modifications or variations that would be apparent to one skilled in the art and that are derived from the meaning, scope and equivalent concepts of the claims are intended to be embraced therein.

Claims

1. A failure diagnosing device of a hydraulic pump capable of diagnosing a failure of a hydraulic pump, the hydraulic pump comprising: A pump main body; An inclined plate disposed inside the pump main body; A piston capable of changing the position of the inclined plate; A support plate disposed between the inclined plate and the piston, The fault diagnosis apparatus of the hydraulic pump is characterized by comprising: A rod provided to the inclined plate; A sensor for detecting vibration of the inclined plate as a vibration accelerometer sensor; A housing supported to the outside of the pump main body, a housing hollow portion being formed inside the housing, the sensor being supported to one side of the outside of the housing; A shaft angle piece receiving vibration of the inclined plate from the rod and transmitting to the sensor, at least a part of the shaft angle piece being inserted into the housing hollow portion; A bearing disposed inside the housing hollow portion to support the shaft angle piece in a manner capable of rotating inside the housing; A rod protrusion protruding from one side of the rod; and A shaft groove recessed from the shaft angle piece to be inserted into the rod protrusion.

2. The hydraulic pump failure diagnosis apparatus according to claim 1, characterized by A control portion receiving vibration detected by the sensor and predicting a wear state between the piston and the support plate to diagnose a fault of the hydraulic pump.

3. The hydraulic pump failure diagnosis apparatus according to claim 2, characterized by The control portion removes noise from vibration detected by the sensor based on a fault diagnosis model to predict a wear state between the piston and the support plate.

4. The hydraulic pump failure diagnosis apparatus according to claim 3, characterized by The fault diagnosis model is generated by one or more learning algorithms of deep learning or machine learning.

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