A hydraulic motor running-in test bench with a closed structure and a test method

Abstract

The present invention relates to the field of hydraulic motor performance detection, and particularly relates to a running-in test bench and test method for a hydraulic motor with a closed structure, including a test chamber. A rectangular groove is opened at the front end of the test chamber, and a rectangular plate is also installed at the front end of the test chamber. Guide grooves are opened on the left and right inner walls of the test chamber. A support plate is slidably arranged between the left and right corresponding guide grooves. A temperature sensor for detecting the temperature of the housing of the tested motor is arranged on the support plate. A placement groove is opened on the support plate, and the tested motor is placed in the placement groove. A clamping unit for clamping the tested motor is arranged on the support plate. The tested motor is limited by a placement plate, and then the placement plate is pushed into the interior of the test chamber. The tested motor can be automatically clamped and limited through the clamping unit and the triggering of a triggering unit. After the tested motor completes the experiment, the clamping unit can also be taken out of the test chamber with the placement plate to cancel the clamping of the tested motor.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic motor inspection and detection, in particular to a closed hydraulic motor running test bench. Background Art

[0002] A hydraulic motor is a hydraulic component that converts hydraulic energy into mechanical energy. It is commonly used in various mechanical equipment requiring torque output, such as construction machinery, ships, and agricultural machinery. During the factory testing phase, hydraulic motors typically undergo running-in tests, such as no-load and loaded operation tests. These tests involve operating the motor under both no-load and high-load conditions for a period of time to observe normal operation, abnormal noise and vibration, and other factors to assess any design or material defects. Furthermore, during the running-in test, the hydraulic motor generates significant heat due to its numerous internal friction pairs. Therefore, it is necessary to monitor the motor's housing temperature to determine whether the temperature rise is within the normal range.

[0003] In existing platforms for running-in tests on hydraulic motors, operators must repeatedly install and remove the motor from the test device, a cumbersome and inefficient process. With advancements in testing technology, technicians in related fields have also optimized hydraulic motor running-in test devices. To provide a more accurate comparison, Chinese patent publication number CN115388065A discloses a hydraulic motor running-in test device.

[0004] It includes a base plate and two motor mounting plates installed on the base plate; the load hydraulic motor is installed on one of the motor mounting plates, and the oil inlet and oil return port of the load hydraulic motor are connected by an oil pipe; a sensing block is provided on the coupling; one end of the coupling is connected to the load hydraulic motor, and the other end is connected to the test hydraulic motor; two proximity switches adapted to the sensing block are located on both sides of the coupling; the oil source is connected to a servo valve connected to the oil inlet and oil return port of the test hydraulic motor, and the servo valve is connected to a servo controller; the load hydraulic motor is connected to the test hydraulic motor through the coupling, and the test hydraulic motor drives the load hydraulic motor to rotate, controls the opening of the servo valve, controls the speed of the test hydraulic motor, and realizes reversal of the test hydraulic motor through induction by the sensing block and the proximity switch.

[0005] However, when using the above-mentioned prior art to conduct a running-in test on a hydraulic motor, the following problems still exist:

[0006] 1. When the above-mentioned running-in device is used to perform a running-in test on a hydraulic motor, the test installation and disassembly process of the hydraulic motor is relatively cumbersome and mainly relies on manpower.

[0007] 2. The running-in device mentioned above occupies a large space and is only applicable to hydraulic motors of a single model and specification, with poor applicability. 3. The test bench is not enclosed, and the noise of the hydraulic motor during the test is relatively large, affecting the environment. Moreover, in the event of safety accidents such as the loosening of the coupling or abnormal vibration of the motor during the test, there is a lack of an effective protection mechanism.

[0008] Therefore, in view of the above statements, there is still room for optimization in the existing technology for the running-in test equipment of hydraulic motors. Summary of the Invention

[0009] To solve the above problems, the present invention provides a closed test bench for running-in hydraulic motors, including a test box. A rectangular groove is opened at the front end of the test box, and a rectangular plate is also installed at the front end of the test box. Guide grooves are opened on the left and right inner walls of the test box, and a supporting plate is slidably arranged between the corresponding left and right guide grooves. A pulling handle is arranged at the front end of the supporting plate. A temperature sensor for detecting the temperature of the housing of the tested motor is arranged on the supporting plate. A placement groove is opened on the supporting plate, and the tested motor is placed in the placement groove. A clamping unit for clamping the tested motor is arranged on the supporting plate.

[0010] The clamping unit includes sliding grooves symmetrically opened on the left and right of the supporting plate. Arc-shaped plates are slidably arranged in the sliding grooves, and electro-hydraulic push rods are arranged between the arc-shaped plates and the inner walls of the corresponding sliding grooves.

[0011] Preferably, the clamping unit further includes several support shafts arranged at the front and rear ends of the arc-shaped plates. Arc-shaped plates are also slidably arranged outside the corresponding upper and lower support shafts. At least two telescopic rods distributed along its extension section are arranged on the side of the arc-shaped plate facing the tested motor, and an arc-shaped attaching plate that is in close contact with the tested motor is jointly arranged between the corresponding upper and lower telescopic rods.

[0012] Preferably, a vibration sensor for detecting the vibration intensity of the tested motor during operation is arranged between the telescopic rod and the corresponding arc-shaped attaching plate.

[0013] Preferably, a trigger unit for driving the arc-shaped plate to move is arranged at the lower end of the supporting plate. The trigger unit includes a driven plate arranged at the lower end of the arc-shaped attaching plate. Swing shafts symmetrically distributed on the left and right are arranged at the lower end of the test box. Swing plates in contact with the corresponding driven plates are sleeved outside the swing shafts. Reversing gears that are meshed with each other are also sleeved outside the swing shafts. Arc-shaped grooves symmetrically distributed in the front and rear are opened at the lower end of the test box. Limit arc plates located in the corresponding arc-shaped grooves are arranged at the lower end of the swing plate.

[0014] Preferably, a support plate is jointly arranged on the left and right inner walls of the test box. A limiting ring is arranged in the middle of the support plate. A coupling is rotatably arranged in the limiting ring, and the front end of the coupling is connected to the output shaft of the tested motor. A connecting shaft with one end rotatably connected to the inner wall of the test box is arranged at the rear end of the coupling.

[0015] Support blocks are provided at the lower end of the test chamber. A roller is provided at the upper end of the support block. A sensor for testing the output torque of the motor under test is provided inside the roller. A loading device is rotatably provided at the rear end of the roller.

[0016] In addition, the present invention also provides a hydraulic motor running-in test method, including the following steps: S1: Installation of the hydraulic motor. Place the motor under test into the support groove on the support plate, and then place the support plate into the test chamber through the guide groove. During the process of placing the support plate into the test chamber, the trigger unit drives the clamping unit to clamp the motor under test.

[0017] S2: Hydraulic motor running-in experiment. After the motor under test is clamped, high-pressure hydraulic oil can be injected into the motor under test through an external supply device to make the motor under test rotate. When the motor under test rotates, the torque sensor will detect the output torque of the motor under test, and during the rotation of the motor, the clamping assembly can collect the vibration amplitude of the motor under test in real time, facilitating the operator to make statistics.

[0018] S3: Adjust the load of the hydraulic motor. The operator adjusts the load of the loading device on the motor under test according to the actual experimental needs to detect the output torque of the motor under test.

[0019] In summary, the present application includes at least one of the following beneficial technical effects:

[0020] First, the present invention limits the motor under test through the placement plate, and then pushes the placement plate into the interior of the test chamber. Through the triggering of the clamping unit and the trigger unit, the motor under test can be automatically clamped and limited. After the motor under test completes the experiment, the clamping unit can also be taken out of the test chamber with the placement plate to cancel the clamping of the motor under test, greatly reducing the labor intensity of the operator.

[0021] Second, the present invention can respectively detect the output torque, vibration amplitude and housing temperature of the motor under test through various sensors, further increasing the applicability of the present invention.

[0022] Third, this test chamber is of a closed structure, reducing the impact of the noise generated by the hydraulic motor during the running-in test on the external environment, and having a certain mechanical protection effect, effectively preventing accidents during the running-in test and improving the personal safety of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the drawings and embodiments.

[0024] Figure 1 is a schematic structural diagram of the present invention.

[0025] Figure 2 is a schematic cross-sectional structural diagram of the present invention.

[0026] Figure 3 This invention Figure 2 A partial enlarged view of point A in the middle.

[0027] Figure 4 It is a structural diagram of the trigger unit and the drive assembly of the present invention.

[0028] Figure 5 It is a structural schematic diagram of the trigger unit of the present invention from another perspective.

[0029] Figure 6 It is a structural schematic diagram of the regulating component of the present invention.

[0030] Figure 7 It is a structural schematic diagram of the connection component of the present invention.

[0031] In the figure, 1. test box; 10. rectangular groove; 11. rectangular plate; 12. guide groove; 13. supporting plate; 14. pull handle; 15. temperature sensor; 16. placement groove; 17. test motor; 2. clamping unit; 20. sliding groove; 21. arc plate; 22. electro-hydraulic push rod; 23. support shaft; 24. telescopic rod; 25. arc plate; 3. trigger unit; 30. driven plate; 31. swing shaft; 32. swing plate; 33. reversing gear; 34. arc groove; 35. limit arc plate ; 36. Support plate; 37. Limiting ring; 38. Coupling; 39. Connecting shaft; 310. Support block; 311. Roller; 312. Transmission shaft; 4. Driving assembly; 40. Driven shaft; 41. Driving shaft; 42. Driving circular plate; 43. Toggle plate; 44. Fixing groove; 45. Fixing rod; 5. Adjusting assembly; 50. Adjusting groove; 51. Adjusting plate; 52. Clamping plate; 53. Limiting plate; 54. Screw; 55. Turning handle; 6. Connecting assembly; 60. Connecting plate; 61. Docking hole. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1 To the attached Figure 7 While embodiments of the invention have been described in detail, the invention can be implemented in many different ways as defined and covered by the claims.

[0033] The embodiment of the present application discloses a closed hydraulic motor running-in test bench and a test method. It should be noted that the closed hydraulic motor running-in test bench and the test method are mainly applied in the process of running-in testing of hydraulic motors. In terms of technical effects, it can automatically clamp the hydraulic motor, reducing the labor intensity of operators; especially after the hydraulic motor starts, the present invention can not only perform torsional testing on the motor, but also can monitor the vibration amplitude of the hydraulic motor in real time according to the sensor, facilitating the operator to record; and, after the hydraulic motor completes the test, when the operator takes the motor out of this equipment, this hydraulic motor running-in test equipment can automatically cancel the clamping of the hydraulic motor, further reducing the labor intensity of the operator. This equipment has a closed structure, reducing the impact of the noise generated by the hydraulic motor during the running-in test on the external environment, and having a certain mechanical protection effect, effectively preventing accidents during the running-in test and improving the personal safety of operators.

[0034] Embodiment 1: Refer to Figure 1 and Figure 2 As shown, it includes a test box 1, a rectangular groove 10, a rectangular plate 11, a guide groove 12, a supporting plate 13, a pulling handle 14, a temperature sensor 15, a placement groove 16, a tested motor 17 and a clamping unit 2. A rectangular groove 10 is opened at the front end of the test box 1, and a rectangular plate 11 is also installed at the front end of the test box 1. Guide grooves 12 are opened on the left and right inner walls of the test box 1. A supporting plate 13 is slidably arranged between the left and right corresponding guide grooves 12. A pulling handle 14 is arranged at the front end of the supporting plate 13. By pulling the pulling handle 14, the supporting plate 13 can be driven to enter the guide groove 12 through the rectangular groove 10, and then the supporting plate 13 completely enters the test box 1 under the limitation of the guide groove 12. The rectangular plate 11 is used to block the rectangular groove 10 during the experiment.

[0035] A temperature sensor 15 for detecting the temperature of the tested motor 17 is arranged on the supporting plate 13. A placement groove 16 is opened on the supporting plate 13, and the tested motor 17 is placed in the placement groove 16. Before the test, the tested motor 17 is placed in the placement groove 16. The placement groove 16 can limit the tested motor 17 to prevent it from rolling on the supporting plate 13. When the tested motor 17 is running, the temperature sensor 15 can record the real-time running temperature of the tested motor 17 by the change of the temperature in the test box 1; a clamping unit 2 for clamping the tested motor 17 is arranged on the supporting plate 13, and the clamping unit 2 can clamp the tested motor 17 to prevent it from rolling during the running process.

[0036] Continue to refer to Figure 2 and Figure 3As shown in the figure, it is the clamping unit 2 for clamping the tested motor 17. Specifically, the clamping unit 2 includes a sliding groove 20, an arc-shaped plate 21, an electro-hydraulic push rod 22, a support shaft 23, a telescopic rod 24, and an arc-shaped attaching plate 25. The left and right symmetric sliding grooves 20 are opened on the supporting plate 13. An arc-shaped plate 21 is slidably arranged in the sliding groove 20. An electro-hydraulic push rod 22 is arranged between the arc-shaped plate 21 and the inner wall of the corresponding sliding groove 20. Several support shafts 23 are arranged at the front and rear ends of the arc-shaped plate 21. An arc-shaped plate 21 is also slidably arranged outside the vertically corresponding support shafts 23. The arc-shaped plate 21 can drive the corresponding arc-shaped plate 21 to move in the left and right directions in the sliding groove 20 through the support shaft 23. In the initial situation, the electro-hydraulic push rod 22 can pull the corresponding arc-shaped plate 21 to be located at one end of the sliding groove 20 far from the tested motor 17.

[0037] On the side of the arc-shaped plate 21 facing the tested motor 17, at least two telescopic rods 24 are arranged along its extension section. And an arc-shaped attaching plate 25 that is in close contact with the tested motor 17 is jointly arranged between the vertically corresponding telescopic rods 24. When the arc-shaped plate 21 is driven by an external force, it can drive the corresponding arc-shaped attaching plate 25 to be tightly attached to the outer side surface of the tested motor 17 through the telescopic rod 24 to clamp the tested motor 17. The function of the telescopic rod 24 is to provide a buffer force between the arc-shaped attaching plate 25 and the tested motor 17.

[0038] A vibration sensor (not shown in the figure) for detecting the vibration intensity of the tested motor 17 during operation is arranged between the telescopic rod 24 and the corresponding arc-shaped attaching plate 25. When the tested motor 17 is running, its body will vibrate, and the vibration sensor will record its vibration amplitude in real time, so that the operator can judge whether its vibration amplitude meets the standard.

[0039] Refer to Figure 4 and Figure 5 As shown in the figure, that is, a trigger unit 3 for driving the arc-shaped plate 21 to move is arranged at the lower end of the supporting plate 13. Specifically, the trigger unit 3 includes a driven plate 30, a swing shaft 31, a swing plate 32, a reversing gear 33, an arc-shaped groove 34, a limiting arc plate 35, a supporting plate 36, a limiting ring 37, a coupling 38, a connecting shaft 39, a support block 310, a roller 311, and a transmission shaft 312. The driven plate 30 is arranged at the lower end of the arc-shaped attaching plate 25, and the driven plate 30 can drive the corresponding arc-shaped plate 21 to move in the sliding groove 20. Swing shafts 31 symmetrically distributed left and right are arranged at the lower end of the test chamber 1. Swing plates 32 in contact with the corresponding driven plates 30 are sleeved outside the swing shafts 31, and the swing shafts 31 can drive the swing plates 32 to swing around their axes.

[0040] A reversing gear 33 that meshes with each other is also sleeved outside the swing shaft 31. When one side of the swing shaft 31 is driven to rotate, the swing shaft 31 on the other side can be driven to rotate through the reversing gear 33. At this time, the swing shafts 31 on both sides can rotate in opposite directions, so that the corresponding swing shafts 31 swing in the corresponding directions. When the swing plate 32 swings to a predetermined position, it is fixed by an external force at this time. When the support plate 13 enters the test chamber 1, the driven plate 30 will move under the drive of the swing plate 32 at this time. During the movement, it contacts the outside of the corresponding swing plate 32, clamping the outer side of the motor under test 17. According to the diameter of the motor under test 17, the swing amplitude of the swing plate 32 is indirectly adjusted later, and then the clamping amplitude of the arc-shaped attaching plate 25 to the motor under test 17 can be indirectly driven to reach a reasonable distance.

[0041] Arc-shaped grooves 34 that are symmetrically distributed front and back are opened at the lower end of the test chamber 1. A limiting arc plate 35 located in the corresponding arc-shaped groove 34 is arranged at the lower end of the swing plate 32. The swing plate 32 can drive the limiting arc plate 35 to slide in the corresponding arc-shaped groove 34. When the limiting arc groove moves, the corresponding swing plate 32 can be limited and guided through the arc-shaped groove 34.

[0042] Support plates 36 are jointly arranged on the left and right inner walls of the test chamber 1. A limiting ring 37 is arranged in the middle of the support plate 36. A coupling 38 is rotatably arranged in the limiting ring 37. The coupling 38 can rotate in the limiting ring 37, and the support plate 36 can support the limiting ring 37; and the front end of the coupling 38 is connected to the output shaft of the motor under test 17, and a connecting shaft 39 with one end rotatably connected to the inner wall of the test chamber 1 is arranged at the rear end of the coupling 38. When the motor under test 17 rotates, the connecting shaft 39 can be driven to rotate through the coupling 38.

[0043] A support block 310 is arranged at the lower end of the test chamber 1. A roller 311 is arranged at the upper end of the support block 310. The support block 310 is used to support the roller 311; a sensor for testing the output torque of the motor under test 17 is arranged in the roller 311, and a loading device is arranged in the roller 311. The loading device can indirectly adjust the torque applied to the motor under test 17 by moving back and forth in the roller 311. The connecting shaft 39 is connected to the lower loading device through a universal joint transmission method.

[0044] It should be noted that the "loading device" mentioned in the above implementation process is a well-known technology. Its function is to give a force opposite to the rotation direction of the motor, that is, a reverse acting force. And the reverse acting force exerted by the loading device on the motor can be indirectly adjusted by moving back and forth, so as to realize the adjustment of the motor torque. Therefore, it will not be elaborated in this implementation process.

[0045] Example two: Continue to refer to Figure 4As shown, on the basis of Example 1, in order to facilitate the operator to adjust the trigger unit 3 more conveniently, a driving assembly 4 is provided on the inner wall of the lower end of the test box 1; specifically, the driving assembly 4 includes a driven shaft 40, a driving shaft 41, a driving circular plate 42, a toggle plate 43, a fixing groove 44 and a fixing rod 45. The driven shaft 40 is arranged on the inner wall of the bottom of the test box 1 in a rotating manner, and the driven shaft 40 is connected to the swing shaft 31 on one side by a belt transmission. When the driven shaft 40 rotates, the swing shaft 31 on one side can be driven to rotate by the belt transmission; a driving shaft 41 is also provided on the inner wall of the lower end of the test box 1, and the driving shaft 41 and the driven shaft 40 are connected by a belt transmission. The driving shaft 41 can drive the driven shaft 40 to rotate by the belt transmission.

[0046] A driving circular plate 42 is provided on the outer side of the driving shaft 41 for longitudinal sliding. A toggle plate 43 is provided on the outer side of the driving circular plate 42. The driving circular plate 42 can rotate in the up and down directions on the outer side of the driving shaft 41, and the toggle plate 43 can drive the driving shaft 41 to rotate through the driving circular plate 42; the lower end of the test box 1 is provided with several fixed grooves 44 evenly distributed around the axis of the driving shaft 41, and the lower end of the driving circular plate 42 is provided with a fixing rod 45 located inside any one of the fixing grooves 44. When the swing amplitude of the swing plate 32 is to be adjusted, the driving circular plate 42 is first driven to move upward by the toggle plate 43, and then the driving shaft 41 is driven to rotate. When the swing plate 32 swings to the corresponding swing amplitude, the driving circular plate 42 is indirectly driven to move downward by the toggle plate 43, so that after the fixing rod 45 is inserted into the corresponding fixing groove 44, the swing plate 32 is indirectly limited.

[0047] 7 , in order to be able to adjust and move the torque generated by the loading device, an adjustment component 5 is provided on the outside of the drum 311; specifically, the adjustment component 5 includes an adjustment slot 50, an adjustment plate 51, a card plate 52, a limit plate 53, a screw rod 54 and a rotating handle 55. The adjustment slot 50 is opened on one side of the drum 311, and an adjustment plate 51 is slidingly arranged in the adjustment slot 50. The adjustment plate 51 can slide in the front and rear directions under the limit of the adjustment slot 50; a card plate 52 is provided on the side of the adjustment plate 51 close to the drum 311, and the inner wall of the card plate 52 is slidably connected to the loading device. The card plate 52 can move synchronously with the adjustment plate 51, and the card plate 52 can drive the loading device to move.

[0048] At the front and rear ends of the roller 311, there are also limit plates 53 corresponding to the adjusting plate 51. A lead screw 54 is threaded through between the front and rear corresponding limit plates 53 and the adjusting plate 51. One end of the lead screw 54 is provided with a rotating handle 55. The limit plate 53 can limit the lead screw 54. When adjusting the torque of the loading device, the lead screw 54 can be driven to rotate by rotating the handle 55. When the lead screw 54 rotates, it can drive the adjusting plate 51 to slide in the adjusting groove 50.

[0049] On one side of the support plate 36, a torque sensor is also installed, and the output shaft of the motor passes through the torque sensor. Therefore, when the output shaft of the motor rotates, the torque sensor can detect the torque of the output shaft of the motor in real time.

[0050] Referring Figure 7 As shown, that is, at the upper end of the test chamber 1, there is also a connection assembly 6 for connecting with an external supply device; specifically, the connection assembly 6 includes a connection plate 60 and a docking hole 61. The connection plate 60 is arranged at the upper end of the test chamber 1, and docking holes 61 corresponding to the tested motor 17 are symmetrically formed on the connection plate 60. The hydraulic oil delivery pipe of the external supply device can enter the test chamber 1 through the docking hole 61 and be connected to the interface on the tested motor 17 to provide power for the tested motor 17.

[0051] In addition, the present invention also provides a hydraulic motor running-in test method, including the following steps:

[0052] S1: Installation of the hydraulic motor. The tested motor 17 is placed into the support groove on the support plate 13, and then the support plate 13 is placed into the test chamber 1 from the guide groove 12. During the process of placing the support plate 13 into the test chamber 1, the triggering unit 3 drives the clamping unit 2 to clamp the tested motor 17.

[0053] S2: Running-in experiment of the hydraulic motor. After the tested motor 17 is clamped, hydraulic oil can be injected into the tested motor 17 through an external supply device to make the tested motor 17 rotate. When the tested motor 17 rotates, the loading device will detect the output torque of the tested motor 17, and during the rotation of the motor, the clamping assembly can collect the vibration amplitude of the tested motor 17 in real time, which is convenient for the operator to count.

[0054] S3: Adjust the load of the hydraulic motor. The operator adjusts the load of the loading device on the tested motor 17 according to the actual experimental needs to detect the output torque of the tested motor 17.

[0055] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0056] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A hydraulic motor running-in test bench with a closed structure, comprising a test chamber (1), characterized in that: The front end of the test chamber (1) is provided with a rectangular groove (10). A rectangular plate (11) is also installed at the front end of the test chamber (1). Guide grooves (12) are opened on the left and right inner walls of the test chamber (1). A support plate (13) is slidably arranged between the correspondingly left and right guide grooves (12). A pulling handle (14) is arranged at the front end of the support plate (13). A temperature sensor (15) for detecting the shell temperature of the tested motor (17) is arranged on the support plate (13). A placement groove (16) is opened on the support plate (13). The tested motor (17) is placed in the placement groove (16). A clamping unit (2) for clamping the tested motor (17) is arranged on the support plate (13). The clamping unit (2) includes sliding grooves (20) symmetrically opened on the left and right of the support plate (13). An arc-shaped plate (21) is slidably arranged in the sliding groove (20). An electro-hydraulic push rod (22) is arranged between the arc-shaped plate (21) and the inner wall of the corresponding sliding groove (20). The clamping unit (2) further includes several support shafts (23) arranged at the front and rear ends of the arc-shaped plate (21). An arc-shaped plate (21) is also slidably arranged outside the correspondingly upper and lower support shafts (23). At least two telescopic rods (24) distributed along its extension section are arranged on the side of the arc-shaped plate (21) facing the tested motor (17). An arc-shaped attaching plate (25) in tight contact with the tested motor (17) is arranged between the correspondingly upper and lower telescopic rods (24). A vibration sensor for detecting the vibration intensity of the tested motor (17) during operation is arranged between the telescopic rod (24) and the corresponding arc-shaped attaching plate (25). A trigger unit (3) for driving the arc-shaped plate (21) to move is arranged at the lower end of the support plate (13). The trigger unit (3) includes a driven plate (30) arranged at the lower end of the arc-shaped attaching plate (25). Swing shafts (31) symmetrically distributed left and right are arranged at the lower end of the test chamber (1). Swing plates (32) in contact with the corresponding driven plates (30) are sleeved outside the swing shafts (31). Reversing gears (33) engaged with each other are also sleeved outside the swing shafts (31). Arc-shaped grooves (34) symmetrically distributed front and rear are opened at the lower end of the test chamber (1). A limiting arc plate (35) located in the corresponding arc-shaped groove (34) is arranged at the lower end of the swing plate (32).

2. The hydraulic motor running-in test bench with a sealed structure according to claim 1, characterized in that: Support plates (36) are jointly arranged on the left and right inner walls of the test chamber (1). A limiting ring (37) is arranged in the middle of the support plate (36). A coupling (38) is rotatably arranged in the limiting ring (37). The front end of the coupling (38) is connected to the output shaft of the tested motor (17). A connecting shaft (39) with one end rotatably connected to the inner wall of the test chamber (1) is arranged at the rear end of the coupling (38). A support block (310) is provided at the lower end of the test chamber (1). A roller (311) is provided at the upper end of the support block (310). A detection unit (4) for testing the output torque of the motor under test (17) is provided inside the roller (311). A transmission shaft (312) with one end connected to the detection unit (4) is rotatably provided at the rear end of the roller (311). The other end of the transmission shaft (312) is connected to the connecting shaft (39) by means of a universal joint drive.

3. A running-in test method for a hydraulic motor, comprising a test bench for running in a hydraulic motor with a closed structure as described in any one of claims 1 or 2, characterized in that, The running-in method includes the following steps: S1: Installation of the motor under test. The motor under test (17) is placed into the support groove on the support plate (13), and then the support plate (13) is placed into the test chamber (1) through the guide groove (12). During the process of placing the support plate (13) into the test chamber (1), the trigger unit (3) drives the clamping unit (2) to clamp the motor under test (17). S2: Running-in experiment of the motor under test. After the motor under test (17) is clamped, high-pressure hydraulic oil can be injected into the oil inlet of the motor under test (17) through an external supply device, causing the motor under test (17) to rotate. When the motor under test (17) rotates, the detection unit (4) will detect the output torque of the motor under test (17), and during the rotation of the motor under test (17), the clamping assembly can collect the vibration amplitude of the motor under test (17) in real time for the operator to analyze. S3: Adjust the load of the motor under test. The operator adjusts the load of the loading device on the motor under test (17) according to the actual experimental needs to detect the output torque of the motor under test (17).

Images