Combined sealing device friction wear and external leakage test bench and test method thereof

Abstract

The invention discloses a combined sealing device frictional wear and external leakage test bed and a test method thereof, and aims to solve the problem that the existing device cannot accurately know the sealing wear. The test bench comprises a rack, a test piece, a stay wire sensor, an oil pipe and a hydraulic system, wherein an oil tank is arranged in the rack. The test piece comprises a test sealing assembly and a plunger, and the stay wire sensor is connected with a sealing combination structure. During testing, the hydraulic system drives the plunger and the sealing assembly to move relatively, the pull wire sensor measures displacement, friction force is calculated by combining pressure data to reflect abrasion, and the oil groove collects leaked oil. According to the invention, comprehensive testing of friction, wear and leakage is realized, sealing performance and wear rules under multiple working conditions can be analyzed, the structure is convenient to observe and operate, and optimization of the sealing structure is facilitated.

Description

Technical Field

[0001] This invention relates to the field of sealing device test bench technology, and in particular to a test bench and test method for friction, wear and external leakage of combined sealing devices. Background Technology

[0002] The sealing performance and service life of a combined seal are closely related to its structure, compression, materials, and operating conditions. In particular, excessive compression can improve sealing performance, but it also leads to an increase in the coefficient of friction and wear. Existing tribological theories cannot accurately predict friction and wear problems; therefore, friction and wear experiments are necessary to arrive at a more reasonable solution. However, existing experimental devices can only monitor the coefficient of friction of the seal assembly in real time and cannot accurately determine the wear of the combined seal device. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that existing sealing combination test benches cannot accurately detect the wear of combined sealing devices.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a test bench for friction, wear and external leakage of a combined sealing device, including a frame, a test piece installed in the frame, a pull-wire sensor connected between the test piece and the frame, and oil pipes connected to the top of both ends of the test piece and connected to an external hydraulic system. A test sealing assembly and a plunger axially slidably disposed in the test sealing assembly are installed inside the test piece. The detection end of the pull-wire sensor is connected to the sealing assembly structure. An oil tank for detecting leakage is provided at the bottom of the frame.

[0005] Preferably, the platform includes a base, a left end cover and a right end cover mounted on the top of both ends of the base, and an observation window connected between the left end cover and the right end cover, and the oil tank is fixed to the bottom of the base by a mounting pin.

[0006] Preferably, the base has mounting grooves with semi-circular cross-sections at both ends, the ends of the specimens are arranged in the mounting grooves, and a rectangular oil receiving groove is provided in the middle of the base. The groove opening at the end of the mounting groove is connected to the top of the oil receiving groove, and the oil groove is connected to the bottom of the oil receiving groove.

[0007] Preferably, both the left and right end caps are semi-circular and hollow inside. Both ends of the left and right end caps are provided with bosses and are fixedly connected to the base by the bosses and bolts. The top of both the left and right end caps is provided with an oil pipe hole for the oil pipe to pass through vertically.

[0008] Preferably, mounting bosses are provided on the opposite sidewalls of the left and right end covers, and the end of the observation window is fixedly connected to the mounting bosses.

[0009] Preferably, the test piece includes a circular cylinder at the end, the end face and outer wall of the cylinder are in contact with the inner wall of the mounting groove, and circular openings are provided on the opposite side walls of the two cylinders. The test sealing assembly is fixed on the annular opening, the plunger is barbell-shaped, and the end of the plunger is axially slidably connected in the test sealing assembly.

[0010] Preferably, a flange-shaped test component is fixedly connected to the circular opening, a circular channel is provided in the middle of the test component, the test sealing component is installed on the inner side wall of the circular channel, the outer side wall of the plunger end is in contact with the inner side wall of the test sealing component, and an annular sealing ring mounting groove is provided on the connecting side wall of the cylinder and the test component, and a sealing ring is installed in the sealing ring mounting groove.

[0011] Preferably, a scraper is vertically fixedly connected to the middle of the plunger, the scraper is located at the top of the plunger, the detection end of the pull wire sensor is fixedly connected to the top of the scraper, and the detection end of the pull wire sensor is in a horizontal state.

[0012] Preferably, the hydraulic system includes an oil tank, a filter, a rubber shock absorber, a hydraulic pump, a check valve, a speed control valve, a three-position four-way valve, a hydraulically controlled check valve, and a pressure transmitter connected in sequence. The pressure transmitter is connected to the oil pipe. A pipeline connects the oil tank and the three-position four-way valve, and a second relief valve is installed on the pipeline. A pipeline connects the oil tank and the speed control valve, and a first relief valve and a two-position two-way directional valve are connected in parallel on the pipeline.

[0013] The test method for the combined sealing device friction, wear and external leakage test bench includes the following steps: Step 1: Specimen installation. Open the test bench and install the specimen inside the test bench. Connect the oil pipe to the specimen, connect the pull wire sensor to the specimen, and seal the specimen inside the test bench through the left end cover, right end cover and observation window. Connect the oil pipe and hydraulic system. Step 2: Testing. The hydraulic system is controlled to supply oil to the test piece, so that oil enters at the left end and returns at the right end. The plunger in the test piece moves to the right, generating a relative linear motion with the test sealing component in the test piece. The movement data of the plunger is detected by the pull-wire sensor, and the test data is fed back to the control system of the hydraulic system to detect the sealing status of the combined sealing component consisting of the sealing component and the test sealing component. Step 3: Seal Wear Detection. The hydraulic system's oil flow rate, supply direction, and inlet pressure are adjusted via the control system. The frictional force of the test seal assembly is calculated using the pressure transmitters in the hydraulic system and the end face area of ​​the plunger. The pressure transmitters on the two pipelines connecting the hydraulic system and the test piece at both ends detect the following pressures: and The inlet pressure is adjusted by the first and second relief valves. Based on the detected friction of the test sealing assembly and the deformation of the combined sealing assembly (comprising the test sealing assembly and the sealing assembly itself) observed through the observation window, the relationship between the inlet pressure and the deformation of the test sealing assembly is analyzed. The relationship between the friction of the combined sealing assembly and the plunger running speed is detected by adjusting the oil pressure and flow rate. This is further analyzed through prolonged measurement. and The results were used to test the wear condition of the sealing components.

[0014] This invention provides a test bench and test method for friction, wear and external leakage of a combined sealing device, which has the following beneficial effects.

[0015] 1. By setting a pull-wire sensor on the specimen, with its detection end connected to the sealing assembly structure, the displacement change of the plunger and the test sealing assembly during relative motion can be captured in real time. Combined with friction force calculation (based on pressure transmitter data and plunger end face area), the wear degree of the sealing assembly can be indirectly reflected, solving the core pain point of existing experimental devices that cannot accurately know the wear problem.

[0016] 2. An oil tank is installed at the bottom of the test bench, which, together with the oil receiving tank structure of the base, can directly collect the oil leaked by the sealing components during the test, enabling intuitive detection of external leakage of the seal. This complements the functional limitation of traditional devices that only monitor the coefficient of friction, forming a comprehensive testing system of "friction-wear-leakage".

[0017] 3. The hydraulic system allows for adjustment of oil flow rate, oil supply direction, and inlet pressure. Combined with data feedback from the cable sensor and pressure transmitter, it enables analysis of the relationship between inlet pressure and sealing component deformation, as well as the correlation between friction and plunger running speed. This provides data support for research on sealing performance and wear patterns under different working conditions, and helps optimize the design of the sealing structure.

[0018] 4. The test stand adopts a combination structure of left end cover, right end cover and observation window, which not only ensures the sealing of the test specimen installation, but also allows for direct observation of the real-time deformation and movement of the sealing components through the observation window; the modular installation design of the test specimen and the test stand facilitates quick replacement of the test sealing components and improves experimental efficiency. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the test bench in an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the internal structure of the platform in an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the internal structure of the specimen in an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the internal structure of the platform in an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the structure of the left end cap in an embodiment of the present invention.

[0024] Figure 6 This is a schematic diagram of the structure of the hanging plate in an embodiment of the present invention.

[0025] Figure 7 This is a schematic diagram of the hydraulic system in an embodiment of the present invention.

[0026] In the diagram: 1. Stand; 1-1. Base; 1-2. Left end cover; 1-3. Right end cover; 1-4. Observation window; 1-5. Oil tank; 1-6. Mounting pin; 2. Specimen; 2-1. Cylinder block; 2-2. Test assembly; 2-3. Sealing ring; 2-4. Test sealing assembly; 2-5. Plunger; 2-6. Scraper; 3. Wire sensor; 4. Oil pipe.

[0027] ① Oil tank; ② Filter; ③ Rubber shock absorber; ④ Hydraulic pump; ⑤ Check valve; ⑥ Speed ​​control valve; ⑦ First relief valve; ⑧ Two-position two-way directional valve; ⑨ Second relief valve; ⑩ Three-position four-way directional valve; Hydraulic check valve; Pressure transmitter. Detailed Implementation

[0028] like Figure 1-7 As shown, the present invention provides a test bench for friction, wear and external leakage of a combined sealing device, including a frame 1, a specimen 2 installed in the frame 1, a pull-wire sensor 3 connected between the specimen 2 and the frame 1, and an oil pipe 4 connected to the top of both ends of the specimen 2 and connected to an external hydraulic system. The specimen 2 is equipped with a test sealing assembly 2-4 and a plunger 2-5 axially slidably disposed in the test sealing assembly 2-4. The detection end of the pull-wire sensor 3 is connected to the sealing assembly structure. An oil groove 1-5 for detecting leakage is provided at the bottom of the frame 1.

[0029] like Figure 1 , Figure 2 and Figure 4 As shown, the stand 1 includes a base 1-1, a left end cover 1-2 and a right end cover 1-3 installed at the top of both ends of the base 1-1, and an observation window 1-4 connected between the left end cover 1-2 and the right end cover 1-3. The oil tank 1-5 is fixed to the bottom of the base 1-1 by a mounting pin 1-6.

[0030] The base 1-1 has semi-circular mounting grooves at both ends. The radius of the mounting grooves is the same as the outer diameter of the cylinder 2-1 in the specimen 2. The specimen 2 can be fitted and installed on the semi-circular grooves.

[0031] like Figure 4 As shown, in order to ensure that the pull wire sensor 3 can be installed on the base 1-1 and pass through the left end cover 1-2, the left end of the base 1-1 extends to the top, forming a circular end plate structure. On the right end, in order to facilitate the installation and debugging of the test piece 2, the height of the mounting groove at the right end of the base 1-1 is located at the center of the circular groove.

[0032] like Figure 5 As shown, the left end cover 1-2 is semi-circular in shape. Mounting bosses are arranged at both ends of the left end cover 1-2, and corresponding bosses are arranged on both sides of the base 1-1. The left end cover 1-2 is connected to the base 1-1 by bolts engaging the bosses. A circular hole is machined at the top of the left end cover 1-2, through which the oil supply pipe 4 passes. The bottom of the left end cover 1-2 is hollow, allowing the pull-wire sensor 3 to pass through from above the specimen 2, while also reducing the weight of the left end cover 1-2. The structure of the right end cover 1-3 is similar to that of the left end cover 1-2, but a sealing wall is provided on the right end face of the right end cover 1-3. The sealing wall falls at the rightmost end of the base 1-1, ensuring the sealing of the entire interior of the platform 1.

[0033] like Figure 3 As shown, specimen 2 is a hollow cylindrical structure with a circular oil port in the radial direction. A circular opening is made in the center of the end wall of cylinder 2-1 at the end of specimen 2. Cylinder 2-1 is connected to test assembly 2-2 through a flange structure. In order to ensure the seal between cylinder 2-1 and test assembly 2-2, a sealing ring mounting groove is made on the connecting side wall of cylinder 2-1 and test assembly 2-2, and a sealing ring 2-3 is installed in the mounting groove.

[0034] A groove is made inside the test component 2-2, and the test sealing component 2-4 is installed in the groove. When the structure or material of the test object (test sealing component 2-4) changes, the test component 2-2 and the test sealing component 2-4 are replaced as a whole.

[0035] The plunger 2-5 is a barbell structure that is thin in the middle and thick at both ends. It is symmetrical from left to right. Its end passes through the test assembly 2-2 and is located inside the cylinder 2-1, forming a plunger oil chamber with the cylinder 2-1.

[0036] like Figure 1 , Figure 3 and Figure 6 As shown, a mounting plate 2-6 is installed in the center of the plunger 2-5. Its function is to fix the movable end of the pull wire sensor 3, that is, the detection end of the pull wire sensor 3.

[0037] First, the oil tank 1-5 is fixed to the bottom of the rectangular oil receiving groove inside the base 1-1 by the mounting pin 1-6. The oil receiving groove is connected to the mounting grooves at both ends of the base 1-1. When the plunger 2-5 leaks due to wear between it and the test sealing component 2-4, the leaked hydraulic oil is collected through the oil tank 1-5. By weighing and analyzing the collected hydraulic oil, the friction and wear mechanism of the test sealing component 2-4 is indirectly evaluated.

[0038] When installing the test bench, first install the oil tank 1-5, then assemble the specimen 2 and oil pipe 4, and place the whole assembly into the semi-circular mounting slot of the base 1-1. Note that at this time, the oil pipe 4 and the hanging plate 2-6 are vertically upward. Install the pull wire sensor 3 on the left end of the base 1-1, with the free end of the pull wire extended, and connect it to the hanging plate 2-6 with bolts. Lower the left end cover 1-2 and the right end cover 1-3 from above the base 1-1. During the lowering process, ensure that the oil pipe 4 passes through the round hole at the top of the left end cover 1-2 and the right end cover 1-3. At the same time, the left end cover 1-2 should not touch the pull wire extending from the pull wire sensor 3. After the front and rear bosses of the left end cover 1-2 and the right end cover 1-3 are aligned with the bosses on both sides of the base 1-1, fix them with bolts. Finally, install the observation window 1-3 between the left end cover 1-2 and the right end cover 1-3, and connect the oil pipe 4 and the hydraulic system. The mechanical assembly is now complete.

[0039] During operation, oil enters from the left side of cylinder 2-1 and returns from the right side. The plunger 2-5 moves to the right, generating a relative linear motion with the test sealing assembly 2-4. The detection data from the pull wire sensor 3 is fed back to the control system to control the flow rate and direction of the oil. When oil enters from the right side of cylinder 2-1 and returns from the left side, the plunger 2-5 moves to the left, also generating a relative linear motion with the test sealing assembly 2-4.

[0040] The hydraulic system includes, in sequence, an oil tank ①, a filter ②, a rubber shock absorber ③, a hydraulic pump ④, a check valve ⑤, a speed control valve ⑥, a three-position four-way valve ⑩, and a hydraulically controlled check valve. and pressure transmitter Pressure transmitter A pipeline connects the oil pipe 4, the oil tank ① and the three-position four-way valve ⑩, and a second overflow valve ⑨ is installed on the pipeline. A pipeline connects the oil tank ① and the speed control valve ⑥, and a first overflow valve ⑦ and a two-position two-way directional valve ⑧ are installed in parallel on the pipeline.

[0041] When cylinder 2-1 is fixed, the three-position four-way directional valve ⑩ causes the plunger 2-5 to move back and forth alternately through the switching of the electromagnet, which is used to test the wear problem between the plunger 2-5 and the test sealing assembly 2-4.

[0042] The 2-position 2-way directional valve (⑧) is normally used for system unloading. When its electromagnet is energized, it switches to the working state, and the system starts working.

[0043] The running speed of plunger 2-5 can be adjusted by adjusting the opening size of speed control valve ⑥. The actual running speed of plunger 2-5 can be measured by the pull wire sensor 3 installed on plunger 2-5.

[0044] The three-position four-way directional valve ⑩ has a total of four connecting pipes. Two pipes are connected to the two ends of the test piece 2 respectively, and the other two pipes are connected to the installation pipe of the speed control valve ⑥ and the installation pipe of the second relief valve ⑨ respectively. The second relief valve ⑨ is used to provide reverse back pressure to simulate different load conditions.

[0045] Hydraulic check valves are installed on the pipes connected to both ends of specimen 2. and pressure transmitter Two hydraulic check valves It is used to ensure that the cylinder block remains in a fixed position under external load conditions.

[0046] When the speed control valve ⑥ is opened to its maximum degree and the second relief valve ⑨ is opened to its maximum degree, the test sealing component 2-4 in the test piece 2 is tested by gradually increasing the set pressure of the first relief valve ⑦.

[0047] Two pressure transmitters The measured pressures were respectively and Given that the end face area of ​​plunger 2-5 is A, the frictional force of the test sealing assembly 2-4 can be calculated as follows: By modifying the opening degrees of the first overflow valve ⑦, the speed control valve ⑥, and the second overflow valve ⑨, the [function / property] can be modified. The values ​​are obtained to obtain the relationship between the friction force of the test sealing component 2-4 and the initial oil inlet pressure, thereby indirectly analyzing the deformation problem of the test combination sealing components (i.e., test component 2-2 and test sealing component 2-4).

[0048] By modifying the opening of the speed control valve ⑥, the relationship between the friction force of the combined sealing device and the operating speed can be studied under different operating speeds of the plunger 2-5.

[0049] A test method for a combined sealing device friction wear and external leakage test bench includes the following steps: Step 1: Specimen installation. Open the test stand 1 and install the specimen 2 inside the test stand 1. Connect the oil pipe 4 to the specimen 2. Connect the pull wire sensor 3 to the specimen 2. Seal the specimen 2 inside the test stand 1 through the left end cover 1-2, the right end cover 1-3 and the observation window 1-4. Connect the oil pipe 4 to the hydraulic system. Step 2: Testing. The hydraulic system is controlled to supply oil to the test piece 2, so that oil enters at the left end of the test piece 2 and returns at the right end. The plunger 2-5 in the test piece 2 moves to the right, generating a relative linear motion with the test sealing component assembly 2-4 in the test piece 2. The movement data of the plunger 2-5 is detected by the pull wire sensor 3, and the test data is fed back to the control system of the hydraulic system to detect the sealing status of the combined sealing component consisting of sealing component 2-2 and test sealing component 2-4. Step 3: Seal wear detection. Adjust the hydraulic system's oil flow rate, supply direction, and inlet pressure using the control system's pressure transmitter. The frictional force of the test sealing assembly 2-4 is calculated based on the pressure and end face area of ​​the plunger 2-5. The pressures detected by the pressure transmitters on the two pipelines connected to the two ends of the hydraulic system and the test piece 2 are respectively... and The inlet pressure is adjusted by the first overflow valve ⑦ and the second overflow valve ⑨. Based on the frictional force of the test sealing component 2-4 and the deformation of the combined sealing component consisting of sealing component 2-2 and test sealing component 2-4 observed through the observation window 1-4, the relationship between the inlet pressure and the deformation of the test sealing component 2-4 is analyzed. By adjusting the oil pressure and flow rate, the relationship between the frictional force of the combined sealing component and the running speed of the plunger 2-5 is detected. This is achieved through prolonged measurement. and The results showed that the wear of the sealing components 2-4 was detected.

Claims

1. A test bench for friction, wear, and external leakage of a combined sealing device, characterized in that: The test piece (2) includes a test stand (1), a test piece (2) installed in the test stand (1), a pull wire sensor (3) connected between the test piece (2) and the test stand (1), and an oil pipe (4) connected to the top of both ends of the test piece (2) and connected to an external hydraulic system. The test piece (2) is equipped with a test sealing assembly (2-4) and a plunger (2-5) axially sliding in the test sealing assembly (2-4). The detection end of the pull wire sensor (3) is connected to the sealing assembly structure. The bottom of the test stand (1) is provided with an oil tank (1-5) for detecting leaks.

2. The combined sealing device friction wear and external leakage test bench as described in claim 1, characterized in that: The stand (1) includes a base (1-1), a left end cover (1-2) and a right end cover (1-3) installed on the top of both ends of the base (1-1), and an observation window (1-4) connected between the left end cover (1-2) and the right end cover (1-3). The oil tank (1-5) is fixed to the bottom of the base (1-1) by a mounting pin (1-6).

3. The combined sealing device friction wear and external leakage test bench as described in claim 2, characterized in that: The base (1-1) has a semi-circular cross-section mounting groove at both ends. The ends of the specimen (2) are arranged in the mounting groove. The base (1-1) has a rectangular oil receiving groove in the middle. The groove opening at the end of the mounting groove is connected to the top of the oil receiving groove. The oil groove (1-5) is connected to the bottom of the oil receiving groove.

4. The combined sealing device friction wear and external leakage test bench as described in claim 3, characterized in that: The left end cap (1-2) and the right end cap (1-3) are both semi-circular structures and hollow inside. Both ends of the left end cap (1-2) and the right end cap (1-3) are provided with bosses and are fixedly connected to the base (1-1) by the bosses and bolts. The top of the left end cap (1-2) and the right end cap (1-3) are provided with oil pipe holes for the oil pipe (4) to pass through vertically.

5. The combined sealing device friction wear and external leakage test bench as described in claim 4, characterized in that: Mounting bosses are provided on the opposite side walls of the left end cover (1-2) and the right end cover (1-3), and the end of the observation window (1-4) is fixedly connected to the mounting bosses.

6. The combined sealing device friction wear and external leakage test bench as described in claim 3, characterized in that: The test piece (2) includes a circular cylinder (2-1) located at the end. The end face and outer wall of the cylinder (2-1) are in contact with the inner wall of the mounting groove. Circular openings are provided on the opposite side walls of the two cylinders (2-1). The test sealing assembly (2-4) is fixed on the annular opening. The plunger (2-5) is barbell-shaped. The end of the plunger (2-5) is axially slidably connected in the test sealing assembly (2-4).

7. The combined sealing device friction wear and external leakage test bench as described in claim 6, characterized in that: A flange-shaped test assembly (2-2) is fixedly connected to the circular opening. A circular channel is provided in the middle of the test assembly (2-2). The test sealing assembly (2-4) is installed on the inner wall of the circular channel. The outer wall of the plunger (2-5) end is in contact with the inner wall of the test sealing assembly (2-4). An annular sealing ring mounting groove is provided on the connecting side wall of the cylinder (2-1) and the test assembly (2-2). A sealing ring (2-3) is installed in the sealing ring mounting groove.

8. The combined sealing device friction wear and external leakage test bench as described in claim 7, characterized in that: A scraper (2-6) is vertically fixedly connected to the middle of the plunger (2-5). The scraper (2-6) is located at the top of the plunger (2-5). The detection end of the pull wire sensor (3) is fixedly connected to the top of the scraper (2-6), and the detection end of the pull wire sensor (3) is in a horizontal state.

9. The combined sealing device friction wear and external leakage test bench as described in claim 1, characterized in that: The hydraulic system includes an oil tank, a filter, a rubber shock absorber, a hydraulic pump, a check valve, a speed control valve, a three-position four-way valve, a hydraulically controlled check valve, and a pressure transmitter connected in sequence. The pressure transmitter is connected to the oil pipe (4). A pipeline is connected between the oil tank and the three-position four-way valve. A second relief valve is installed on the pipeline. A pipeline is connected between the oil tank and the speed control valve. A first relief valve and a two-position two-way directional valve are connected in parallel on the pipeline.

10. The test method for the friction, wear, and external leakage test bench of the combined sealing device as described in claim 1, characterized in that, Includes the following steps: Step 1: Specimen installation. Open the test stand (1), install the specimen (2) inside the test stand (1), connect the oil pipe (4) to the specimen (2), connect the pull wire sensor (3) and the specimen (2), seal the specimen (2) inside the test stand (1) through the left end cover (1-2), the right end cover (1-3) and the observation window (1-4), and connect the oil pipe (4) and the hydraulic system. Step 2: Testing. The hydraulic system is controlled to supply oil to the test piece (2), so that oil enters at the left end of the test piece (2) and returns at the right end. The plunger (2-5) in the test piece (2) moves to the right and generates a relative linear motion with the test sealing component assembly (2-4) in the test piece (2). The movement data of the plunger (2-5) is detected by the pull wire sensor (3), and the test data is fed back to the control system of the hydraulic system to detect the sealing status of the combined sealing component consisting of the sealing component (2-2) and the test sealing component (2-4). Step 3: Seal Wear Detection. The hydraulic system's oil flow rate, supply direction, and inlet pressure are adjusted via the control system. The friction force of the test sealing assembly (2-4) is calculated using the pressure detected by the pressure transmitter in the hydraulic system and the end face area of ​​the plunger (2-5). The pressures detected by the pressure transmitters on the two pipelines connecting the hydraulic system and the test piece (2) are respectively... and The oil inlet pressure was adjusted by the first and second relief valves. Based on the friction of the test sealing assembly (2-4) and the deformation of the combined sealing assembly consisting of the sealing assembly (2-2) and the test sealing assembly (2-4) observed through the observation window (1-4), the relationship between the oil inlet pressure and the deformation of the test sealing assembly (2-4) was analyzed. The friction of the combined sealing assembly and the running speed of the plunger (2-5) were detected by adjusting the oil pressure and flow rate. The relationship between the friction of the combined sealing assembly and the running speed of the plunger (2-5) was measured over a long period of time. and The results showed that the wear of the sealing components (2-4) was detected.

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