An abnormal wear monitoring device for a hydraulic pump

Abstract

The application discloses an abnormal wear monitoring device for a hydraulic pump. The device comprises a screw sleeve, an internal cavity of the screw sleeve is sequentially provided with a screw plug, a magnetic element and a spring assembly in the axial direction, the internal cavity wall of the screw sleeve is provided with a taper angle theta in the axial direction, and an oil passage window is arranged on the cavity wall in the circumferential direction; the top end of the magnetic element is fixedly connected with the screw plug, and the bottom end is abutted with the spring assembly; when the screw plug is inserted into the screw sleeve, the magnetic element is positionally corresponding to the oil passage window in the axial direction of the screw sleeve; when the screw plug is pulled out of the screw sleeve, the magnetic element is pulled out together, meanwhile, the spring of the spring assembly is elongated to lift the spring seat of the spring assembly in the axial direction of the screw sleeve, and the spring seat is clamped in the internal cavity of the screw sleeve due to the taper angle theta, so that the oil passage window is sealed and isolated from the outside. The application can timely find the iron-based wear-out objects in the pump cavity of the hydraulic pump, so as to judge the wear degree and whether abnormal wear occurs in the hydraulic pump, and has important significance for early health monitoring and maintenance of the hydraulic pump and improvement of the performance and service life of the hydraulic pump.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydraulic pump abnormal wear monitoring, and particularly relates to an abnormal wear monitoring device for a hydraulic pump. BACKGROUND

[0002] It is known that the cleanliness of oil is particularly important for the performance and service life of hydraulic components in a hydraulic system. In particular, for a hydraulic piston pump, there are many internal friction pairs, and the wear degree is not easy to evaluate, so early health monitoring and fault early warning are more difficult. At present, in the use and maintenance process of the hydraulic pump, the working condition of the hydraulic pump is mainly judged by checking the pressure, sealing performance and oil filter of the hydraulic system. There is a lack of effective monitoring means for early failure of the hydraulic pump, and the hydraulic pump has failed when the fault is found, which has a greater impact on flight safety. The traditional method is to paste a temperature measuring patch on the hydraulic pump shell to monitor the state of the hydraulic pump, which has achieved certain results, but this monitoring measure can only reflect the maximum temperature of the hydraulic pump and cannot reflect the temperature change in real time, so there is a certain limitation. In recent years, although some online oil pollution monitoring devices have emerged, they have complex structure, high cost and low reliability, and in addition, they are difficult to integrate with the hydraulic pump. SUMMARY

[0003] The purpose of the present application is to provide an abnormal wear monitoring device for a hydraulic pump. The present application can timely find the iron-based wear debris appearing in the pump cavity of the hydraulic pump, so as to judge the wear degree and whether abnormal wear occurs in the hydraulic pump, which has important significance for early health monitoring and maintenance of the hydraulic pump and improvement of its performance and service life.

[0004] The technical scheme of the present application is an abnormal wear monitoring device for a hydraulic pump, comprising a threaded sleeve, a threaded plug, a magnetic element and a spring assembly arranged in the threaded sleeve in sequence along the axial direction, the inner cavity wall of the threaded sleeve is provided with a taper angle θ along the axial direction, and an oil passage window is arranged on the cavity wall in the circumferential direction; the top end of the magnetic element is fixedly connected with the threaded plug, and the bottom end is abutted with the spring assembly; when the threaded plug is inserted into the threaded sleeve, the magnetic element corresponds to the position of the oil passage window in the axial direction of the threaded sleeve; when the threaded plug is pulled out of the threaded sleeve, the magnetic element is pulled out together, and at the same time, the spring of the spring assembly is elongated to lift the spring seat of the spring assembly along the axial direction of the threaded sleeve, and the spring seat is clamped in the inner cavity of the threaded sleeve due to the taper angle θ, so as to seal and isolate the oil passage window from the outside.

[0005] In the foregoing abnormal wear monitoring device for a hydraulic pump, the threaded plug and the threaded sleeve are sealed by double sealing rings.

[0006] In the foregoing abnormal wear monitoring device for a hydraulic pump, the number of oil passage windows is three.

[0007] In the abnormal wear monitoring device for hydraulic pump, the screw plug is axially limited by the clamping ring after being inserted into the screw sleeve, and the screw plug is quickly disassembled after the clamping ring is disassembled.

[0008] In the abnormal wear monitoring device for hydraulic pump, the top end of the magnetic element is fixedly connected with the screw plug through the interference fit between the boss at the bottom end of the screw plug and the magnetic element 6.

[0009] In the abnormal wear monitoring device for hydraulic pump, a sealing ring is arranged on the outer wall of the screw sleeve to seal and isolate the internal space of the hydraulic pump from the outside.

[0010] In the abnormal wear monitoring device for hydraulic pump, the abnormal wear monitoring device is screwed on the hydraulic pump shell through the threaded structure on the outer wall of the screw sleeve, and the oil passage window is in the pump cavity of the hydraulic pump and is in communication with each other.

[0011] In the abnormal wear monitoring device for hydraulic pump, the abnormal wear monitoring device is connected to the hydraulic pump oil return system through an adapter connector; the inner cavity of the adapter connector is a T-shaped channel, the coaxial channels of the T-shaped channel are respectively connected to the oil path A of the hydraulic pump oil return port and the oil path B of the system oil return pipeline, and the vertical channel is used for loading the screw sleeve; the oil path A, the oil passage window and the oil path B are sequentially communicated.

[0012] The present application has the advantages that the present application provides a monitoring device which can effectively monitor the wear severity of the hydraulic pump, so that the maintenance personnel can timely monitor the abnormal wear of the friction pair of the hydraulic pump, health management, and can also early warn the failure of the hydraulic pump and timely maintain.

[0013] The abnormal wear monitoring device for hydraulic pump of the present application uses the magnetic force of the magnetic element to collect the metal wear debris in the pump cavity through the adsorption of the magnetically conductive metal object. By disassembling the abnormal wear monitoring device for inspection, the iron-based wear debris appearing in the pump cavity of the hydraulic pump can be found, so as to judge the wear degree and whether abnormal wear occurs in the hydraulic pump. This has important significance for early health monitoring and maintenance of the hydraulic pump and improving its performance and service life.

[0014] The present application can more effectively quantitatively monitor the pollution condition of the pump cavity of the hydraulic pump, so that the maintenance personnel can timely and accurately diagnose the wear condition of the friction pair of the hydraulic pump, and then can timely early warn the failure of the hydraulic pump.

[0015] The present application is convenient to assemble and disassemble, low in cost, and can not only be used for monitoring the abnormal wear degree of the hydraulic pump, but also can be widely used in other occasions where oil pollution monitoring of hydraulic components is required.

[0016] The application effectively improves the health monitoring level of the hydraulic pump, improves the working condition of the hydraulic system, and thus improves the reliability, safety and service life of the hydraulic system and its accessories and even the entire equipment.

[0017] The abnormal wear monitoring device of the application can ensure performance and process after sealing test, adsorption test and disassembly test, and has high reliability. After 180 hours of accelerated durability test, the abnormal wear monitoring device is disassembled, and a small amount of metal powder is found to be adsorbed on the magnetic element. After the hydraulic pump is disassembled, it is found that the metal powder mainly comes from the wear of the bearing of the hydraulic pump, thereby verifying the effectiveness of the application. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the abnormal wear monitoring device of the application;

[0019] Figure 2 is another schematic installation structure diagram of the abnormal wear monitoring device of the application;

[0020] Figure 3 is a schematic diagram of a screw sleeve structure;

[0021] Figure 4 is a schematic diagram of a screw plug structure.

[0022] The drawings show that: 1 is a screw sleeve, 2 is a sealing ring, 3 is an adapter joint, 4 is a spring seat, 5 is a spring, 6 is a magnetic element, 7 is a double-channel sealing ring, 8 is a screw plug, 9 is a hydraulic pump housing, A is an oil path connected to the oil return port of the hydraulic pump, B is an oil path connected to the system oil return pipeline, C is a pump cavity, and D is an oil passage window. DETAILED DESCRIPTION

[0023] The application will be further described below in combination with the drawings and examples, but it is not used as the basis for limiting the application.

[0024] Example 1. An abnormal wear monitoring device for a hydraulic pump, as shown in Figures 1-4 , comprising a screw sleeve 1, a sealing ring 2, an adapter joint 3, a spring seat 4, a spring 5, a magnetic element 6, a double-channel sealing ring 7, a screw plug 8, an oil path A connected to the oil return port of the hydraulic pump, and an oil path B connected to the system oil return pipeline.

[0025] Among them, the inner cavity of the adapter joint 3 is a T-shaped structure, which is provided with an oil path A connected to the oil return port of the hydraulic pump, an oil path B connected to the system oil return pipeline, and an inner hole for installing the screw sleeve 1.

[0026] Further, the screw sleeve 1 is threadedly connected in the middle of the inner cavity of the adapter joint 3. The screw sleeve 1 is provided with a threaded sealing groove, and the sealing ring 2 is arranged in the sealing groove, so that the oil in the inner cavity can be prevented from leaking to the outside of the cavity through the cooperation gap between the screw sleeve 1 and the adapter joint 3.

[0027] In addition, the inner hole angle of the screw sleeve 1 is a conical hole with an angle θ, which is too small, the contact deformation is not enough, and the sealing effect is poor; the angle is too large, the contact stress and deformation are large, which can easily cause the bushing to be scratched or difficult to disassemble, and the θ angle of the screw sleeve (1) of the abnormal wear monitoring device is 0.3-0.6°. When the external field disassembles the screw plug 8 to check whether the metal chips are adsorbed on the magnetic element 6, the spring seat 4 rebounds under the elastic force of the spring 5, and a sealing surface is formed between the outer circle of the spring seat 4 and the conical surface of the screw sleeve 1, which can prevent oil leakage. The screw sleeve 1 is used as a constraint element of the internal structure of the abnormal wear monitoring device, and an insurance hole is arranged at the outer end of the screw sleeve 1 for insurance.

[0028] Further, the screw sleeve 1 is provided with a screw plug 8. The screw plug 8 is used as an auxiliary element, and its function is mainly to fix the magnetic element 6, that is, the bottom end boss of the screw plug 8 is connected in one body with the magnetic element 6 after forming an interference fit, and in the field, it is used as a quick disassembly part to facilitate the inspection of the adsorbed material on the magnetic element 6. In order to ensure the sealing performance of the abnormal wear monitoring device, two sealing grooves are arranged on the outer circle of the screw plug 8 for installing double sealing rings 7, so as to form double sealing with the screw sleeve 1, thereby avoiding the leakage of oil through the gap between the screw sleeve 1 and the screw plug 8. In addition, an annular ring groove is arranged at the outer circle of the nut step of the screw plug 8, and after the ring is installed, it can prevent the screw plug 8 from loosening or falling off, and also can realize quick disassembly and assembly.

[0029] Preferably, in order to ensure the flow of oil, three oil flow windows are arranged on the screw sleeve 1. After being assembled into the screw sleeve 1, the magnetic element 6 will be limited in the oil flow window area, so that the magnetic element 6 can fully contact the circulating oil of the hydraulic system and adsorb the magnetic metal wear particles in the oil.

[0030] The spring seat 4 mainly supports the magnetic element 6, and at the same time, rebounds under the elastic force of the spring 5 during disassembly. Since a certain taper is arranged in the inner hole of the screw plug 8, when the spring presses the spring seat, the outer circle thereof can be precisely fitted with the inner hole of the adapter, thereby forming a sealing surface and ensuring the sealing performance.

[0031] The magnetic element 5 is used to adsorb the magnetic metal particles such as iron, cobalt, nickel and other elements near the window of the screw plug 8 by using the magnetic effect of the material.

[0032] The abnormal wear monitoring device mainly adsorbs the magnetic metal chips. The wear in the hydraulic pump is mainly discharged with the back oil. After the abnormal wear monitoring device is installed on the back oil joint of the pump cavity, the back oil of the hydraulic pump directly flows into the cavity of the abnormal wear monitoring device. The magnetic element in the abnormal wear monitoring device can fully contact the oil and adsorb the magnetic metal chips in the oil. The design and connection mode of the adapter joint can meet the design principle requirements of the abnormal wear monitoring device. After the adapter joint 3 is installed on the hydraulic pump shell, it can be fixed by the compression nut, and the reliability of the connection can be ensured.

[0033] As one of the embodiments of the present application, according to the working principle of the abnormal wear monitoring device, the abnormal wear monitoring device can be directly integrated on the hydraulic pump shell 9 (see Figure 2 ), installed in the pump cavity of the hydraulic pump, and can fully contact the back oil of the pump cavity C of the hydraulic pump, adsorb the magnetic wear particles, and thus realize the effect of pollution monitoring.

[0034] Due to the compact structure of the hydraulic pump, the parts in the pump cavity are closely arranged, and the abnormal wear monitoring device cannot be directly installed in the pump cavity area. The second embodiment of the present application can also be used. A adapter joint 3 is designed, and the hydraulic pump and the abnormal wear monitoring device are connected through the form of replacing the back oil pipe joint, so that the back oil of the hydraulic pump directly flows from the pump cavity to the abnormal wear monitoring device, and then flows into the back oil pipeline. For this purpose, the interface A of the adapter joint 3 is connected with the outer thread of the connection part of the hydraulic pump shell, and the interface B of the adapter joint connected with the system is also provided with an outer thread, and a mounting interface matched with the abnormal wear monitoring device is designed.

[0035] When there is no space on the hydraulic pump shell to directly install the abnormal wear monitoring device, the adapter joint is installed after the abnormal wear monitoring device, the function and performance test, environmental adaptability test and durability test of the hydraulic pump can be carried out, and the effect of the first embodiment can also be achieved. Moreover, it is not necessary to design a specific mounting hole on the pump body, and it can also be more widely applied to other occasions.

[0036] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments. The above description is only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed application.

Claims

1. An abnormal wear monitoring device for a hydraulic pump, characterized in that The application relates to an abnormal wear monitoring device, which comprises a screw sleeve (1), the inner cavity of the screw sleeve (1) is sequentially provided with a screw plug (8), a magnetic element (6) and a spring assembly along the axial direction, the inner cavity wall of the screw sleeve (1) is provided with a taper angle theta along the axial direction; the cavity wall is provided with oil passing windows (D) along the circumferential direction; the top end of the magnetic element (6) is fixedly connected with the screw plug (8), and the bottom end is abutted with the spring assembly; when the screw plug (8) is inserted into the screw sleeve (1), the magnetic element (6) is positionally corresponding to the oil passing windows (D) in the axial direction of the screw sleeve (1); when the screw plug (8) is pulled out of the screw sleeve (1), the magnetic element (6) is pulled out together, meanwhile, the spring (5) of the spring assembly is elongated to lift the spring seat (4) of the spring assembly along the axial direction of the screw sleeve (1), and the spring seat (4) is clamped in the inner cavity of the screw sleeve (1) due to the taper angle theta, so that the oil passing windows (D) are sealed from the outside.

2. The abnormal wear monitoring device for a hydraulic pump according to claim 1, characterized by, The screw plug (8) and the screw sleeve (1) are sealed by double sealing rings (7).

3. The abnormal wear monitoring device for a hydraulic pump according to claim 1, characterized by, The number of the oil passing windows (D) is three.

4. The abnormal wear monitoring device for a hydraulic pump according to claim 1, characterized by, After the screw plug (8) is inserted into the screw sleeve (1), the axial position is limited by a clamping ring, and the screw plug (8) is quickly disassembled after the clamping ring is disassembled.

5. The abnormal wear monitoring device for a hydraulic pump according to claim 1, characterized by, The top end of the magnetic element (6) is fixedly connected with the screw plug (8) in the structure that the bottom end of the screw plug (8) is connected with the magnetic element (6) in interference fit.

6. The abnormal wear monitoring device for a hydraulic pump according to claim 1, characterized by, The outer wall of the screw sleeve (1) is provided with a sealing ring (2), so that the internal space of the hydraulic pump is sealed from the outside.

7. The abnormal wear monitoring device for a hydraulic pump according to claim 1, characterized by, The abnormal wear monitoring device is screwed on the hydraulic pump shell (9) through the threaded structure on the outer wall of the screw sleeve (1), the oil passing windows (D) are in the pump cavity (C) of the hydraulic pump and are communicated with each other.

8. The abnormal wear monitoring device for a hydraulic pump according to claim 1, characterized by, The abnormal wear monitoring device is connected into the oil return pipeline system of the hydraulic pump through an adapter connector (3); the inner cavity of the adapter connector (3) is a T-shaped channel, the coaxial channels of the T-shaped channel are respectively connected with the oil path A of the oil return port of the hydraulic pump and the oil path B of the system oil return pipeline, and the vertical channel is used for loading the screw sleeve (1); the oil path A, the oil passing windows (D) and the oil path B are sequentially communicated.

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