A clamping device for testing hydraulic motors

Abstract

This invention discloses a clamping device for testing a hydraulic motor, comprising: a fixing device, which includes a support component and a positioning component, the positioning component being connected to the support component, and a hydraulic motor being mounted to the positioning component, the positioning component at least restricting the rotation of the hydraulic motor in the circumferential direction; a load simulation mechanism, including a drive device and a connecting sleeve, the connecting sleeve being fixedly connected to the hydraulic motor, the drive device including a hydraulic cylinder, the output end of the hydraulic cylinder being poweredly connected to the connecting sleeve, the hydraulic cylinder being able to apply a tensile force along the axial direction of the hydraulic motor; and a connecting device, including a first connecting plate, a second connecting plate, and a connecting shaft, the first connecting plate being fixedly connected to the output part of the hydraulic motor, the first connecting plate being rotatable relative to the second connecting plate, the connecting shaft being fixedly connected to the first connecting plate, and the connecting shaft rotatably passing through and extending out of the second connecting plate, thereby simulating a load by applying an equivalent tensile force to test the performance of the hydraulic motor under heavy load conditions.

Description

Technical Field

[0001] This invention relates to the field of clamping device technology, and in particular to a clamping device for testing hydraulic motors. Background Technology

[0002] During the production process of hydraulic motors, to ensure that their working performance and quality meet design requirements, a test bench is usually required to conduct performance tests on the hydraulic motors. The clamping device is used to install the hydraulic motor under test onto the test bench. For heavy-duty hydraulic motors used in special working conditions, such as those used in log grappling machines, since log grappling machines need to continuously perform actions such as grabbing, lifting, and transferring large-diameter logs in daily operations, the weight of a single log can often reach several tons. This requires the hydraulic motor driving the log grappling arm to not only provide sufficient rotational torque, but also be able to withstand huge axial tensile loads. These motors are usually in a suspended state and need to bear a load of several tons while rotating. However, the clamping device of the traditional horizontal hydraulic motor test bench is difficult to provide an axial load of several tons during the rotation of the hydraulic motor. In the existing technology, if such special working conditions are to be simulated, a suspended load method is required for testing, which may require excavating a foundation or building a gantry crane or other large facilities, which is not only costly, but also complicated to operate. Therefore, it is necessary to improve it. Summary of the Invention

[0003] The purpose of this invention is to address the deficiencies and shortcomings of the prior art by providing a clamping device for testing hydraulic motors. The device has a simple and reasonable structure and is easy to operate. The clamping device is used to install the hydraulic motor to be tested onto the test bench, and the clamping device can apply an equivalent tensile force along the axial direction of the hydraulic motor to simulate a load, so as to test parameters such as torque of the hydraulic motor under heavy load conditions.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The clamping device for testing a hydraulic motor according to the present invention includes:

[0006] A fixing device, the fixing device including a support component and a positioning component, the positioning component being connected to the support component, a hydraulic motor being mounted to the positioning component, the positioning component at least restricting the movement of the hydraulic motor in the circumferential direction;

[0007] The load simulation mechanism includes a drive device and a connecting sleeve. The connecting sleeve is fixedly connected to a hydraulic motor. The drive device includes a hydraulic cylinder. The output end of the hydraulic cylinder is poweredly connected to the connecting sleeve. The hydraulic cylinder can apply a pulling force along the axial direction of the hydraulic motor and can drive the hydraulic motor to move.

[0008] The connecting device includes a first connecting plate, a second connecting plate, and a connecting shaft. The first connecting plate is fixedly connected to the output part of the hydraulic motor and can rotate relative to the second connecting plate. One end of the connecting shaft is fixedly connected to the first connecting plate, and the other end of the connecting shaft is rotatably inserted through the second connecting plate and extends out of the second connecting plate.

[0009] Furthermore, the support assembly includes a base and a support frame, the positioning assembly is located on the support frame, and the support frame is slidably connected to the base.

[0010] Furthermore, the support frame includes a first base plate, the base includes a second base plate, and a sliding assembly is provided between the first base plate and the second base plate, wherein the first base plate is slidably connected to the second base plate via the sliding assembly.

[0011] Furthermore, the sliding assembly includes a guide rail and a guide rail groove. The guide rail groove is located below the first base plate, and the guide rail is located on the second base plate. The guide rail is slidably connected to the guide rail groove, and both the guide rail and the guide rail groove extend along the moving direction of the hydraulic motor.

[0012] Furthermore, the sliding assembly also includes a slider and a groove, the second base plate has the groove, and the first base plate is provided with a slider that slides in cooperation with the groove. Both the slider and the groove extend along the moving direction of the hydraulic motor.

[0013] Furthermore, the positioning component includes a motor pressure plate having a mounting groove, the hydraulic motor including a cylinder body being confined within the mounting groove, the motor pressure plate having a first hole extending radially through the mounting groove, a first limiting member being connected within the first hole, the first limiting member engaging with the outer peripheral wall of the cylinder body to restrict the cylinder body from rotating around its own axis.

[0014] Furthermore, the motor pressure plate includes an upper pressure plate and a lower pressure plate. The upper pressure plate has a first groove, and the lower pressure plate has a second groove. The first groove and the second groove are arranged opposite to each other, and the first groove and the second groove cooperate to form the mounting groove.

[0015] Furthermore, the upper pressure plate has a plurality of second holes, and the lower pressure plate has a plurality of third holes that correspond to and cooperate with the second holes. The upper pressure plate and the lower pressure plate are fixedly connected by a second limiting member, which passes through the second hole and is fixedly connected to the third hole. The cylinder body is radially confined between the first groove and the second groove.

[0016] Furthermore, a first bearing is connected inside the second connecting plate, the first bearing is sleeved on the outside of the connecting shaft, the second connecting plate has a first limiting step, the connecting shaft has a limiting part, and the first bearing is axially limited between the first limiting step and the limiting part.

[0017] Furthermore, a second bearing and a snap-fit ​​component are also connected inside the second connecting plate. The second bearing is sleeved on the outside of the connecting shaft. The second connecting plate has a second limiting step, and the second bearing is axially limited between the second limiting step and the snap-fit ​​component.

[0018] The beneficial effects of the present invention are as follows: The clamping device for testing hydraulic motors described in the present invention is used to install hydraulic motors onto a test bench, and the clamping device can apply an equivalent tensile force along the axial direction of the hydraulic motor to simulate a load, so as to test the working performance of the hydraulic motor under heavy load conditions.

[0019] The installation and testing process is as follows: The hydraulic motor is fixedly connected to the connecting sleeve. Hydraulic oil is injected into the hydraulic cylinder to push the hydraulic motor to move and press against the first connecting plate to eliminate the gap. After pressing, the hydraulic motor is fixedly connected to the first connecting plate with screws. Then, the hydraulic cylinder pulls the hydraulic motor to limit it to the positioning component, restricting the rotation of the hydraulic motor cylinder in the circumferential direction. After the hydraulic motor is installed in place with the test bench by the clamping device, the test is carried out. The output part of the hydraulic motor rotates, driving the first connecting plate and the connecting shaft to rotate synchronously. The hydraulic cylinder continuously applies tension along the axis of the hydraulic motor to simulate the load. The connecting shaft is connected to the test bench to test the working performance of the hydraulic motor under heavy load conditions. Attached Figure Description

[0020] Figure 1 This is a cross-sectional structural diagram of the present invention from a first perspective;

[0021] Figure 2 yes Figure 1 Enlarged structural diagram at point A;

[0022] Figure 3 yes Figure 1 Enlarged structural diagram at point B;

[0023] Figure 4 This is a cross-sectional structural diagram of the present invention from a second perspective;

[0024] Figure 5 yes Figure 4 A magnified structural diagram at point C.

[0025] Figures 1-5 middle:

[0026] 1. Support components;

[0027] 11. Support frame; 111. First base plate; 1111. Guide rail block;

[0028] 12. Base; 121. Second base plate;

[0029] 13. Guide rail; 131. Guide rail groove;

[0030] 14. Slider; 141. Slide rail;

[0031] 2. Motor pressure plate;

[0032] 21. Upper pressure plate;

[0033] 211. First groove;

[0034] 212, First hole; 2121, First limiting component;

[0035] 213. Second hole; 2131. Second limiting component;

[0036] 22. Lower pressure plate;

[0037] 221. Second groove;

[0038] 222, Third hole;

[0039] 3. Hydraulic cylinder;

[0040] 4. Tail rack;

[0041] 41. Tail frame base plate; 411. Locating pin;

[0042] 42. Hydraulic cylinder connecting plate; 421. Fifth screw;

[0043] 43. Connecting sleeve; 431. Second pin;

[0044] 5. First connecting plate; 51. First pin; 511. Fourth screw;

[0045] 6. Second connecting plate;

[0046] 61. First bearing; 611. First limiting step;

[0047] 62. Second bearing; 621. Second limiting step;

[0048] 63. Snap-on connectors;

[0049] 7. Connecting shaft; 71. Limiting part;

[0050] 8. Hydraulic motor; 81. Cylinder body; 811. Limit groove; 82. Output part; 83. Connecting part. Detailed Implementation

[0051] The invention will now be further described with reference to the accompanying drawings.

[0052] In this invention, the hydraulic motor 8 under test is applied to special application scenarios, especially heavy-load application scenarios. For example, the hydraulic motor 8 under test is applied to log grabbing equipment in forestry machinery. This type of equipment needs to frequently grab, transport and stack large-tonnage logs during operation, which puts high demands on the performance of the hydraulic motor 8. In the actual operation of the log grabbing machine, the hydraulic motor 8 needs to withstand the large load generated by the weight of the wood itself to ensure that it can provide stable power output under heavy load conditions.

[0053] The hydraulic motor 8 under test includes a cylinder 81 and an output part 82. The output part 82 can rotate relative to the cylinder 81. In the actual operation of the log grabber, the output part 82 is used to connect to the chuck, which is used to grab the log. The end of the hydraulic motor 8 away from the output part 82 has a connecting part 83. The connecting part 83 has a first through hole for connection. The outer peripheral wall of the cylinder 81 is provided with a limit groove 811.

[0054] Before the hydraulic motor 8 leaves the factory or during maintenance, it is necessary to conduct performance tests on the hydraulic motor 8 through a test bench. Existing clamping devices are usually only used to install the hydraulic motor 8 onto the test bench. However, the hydraulic motor testing clamping device described in this invention can apply an equivalent tensile force along the axial direction of the hydraulic motor 8 to simulate a load, so as to test the working performance of the hydraulic motor 8 under heavy load conditions.

[0055] like Figures 1-5 A clamping device for testing a hydraulic motor is shown, comprising: a fixing device, the fixing device including a support component 1 for supporting a hydraulic motor 8 and a positioning component for positioning the hydraulic motor 8, the positioning component being connected to the support component 1, the hydraulic motor 8 being mounted to the positioning component, the output part 82 of the hydraulic motor 8 being connected to a connecting device, and the connecting part 83 of the hydraulic motor 8 being connected to a load simulation mechanism, the load simulation mechanism being used to simulate a load and drive the hydraulic motor 8 to move. Specifically, when the load simulation mechanism pulls the hydraulic motor 8 along the axis of the hydraulic motor 8, it can simulate a load to test the working performance of the hydraulic motor 8 under heavy load conditions. The positioning component is limited by a limiting groove 811, at least restricting the rotation of the cylinder 81 in the circumferential direction, to ensure that the hydraulic motor 8 can be stably mounted on the positioning component, avoiding rotation of the cylinder 81 and affecting the test.

[0056] Preferably, in this embodiment, the reference Figure 4The positioning assembly includes a motor pressure plate 2 with a mounting groove. The hydraulic motor 8 includes a cylinder 81, which is confined within the mounting groove. The motor pressure plate 2 has a first hole 212, which is a screw hole. The first hole 212 extends radially along the motor pressure plate 2 and communicates with the mounting groove. A first limiting member 2121 is connected inside the first hole 212. The first limiting member 2121 is in a limiting engagement with the limiting groove 811. Specifically, the first limiting member 2121 is a first screw. By tightening the first screw, the lower end of the first screw is engaged in the limiting groove 811 to restrict the cylinder 81 from rotating around its axis.

[0057] Preferably, in this embodiment, the reference Figure 4 The motor pressure plate 2 includes an upper pressure plate 21 and a lower pressure plate 22. The upper pressure plate 21 has a first groove 211, and the lower pressure plate 22 has a second groove 221. The first groove 211 and the second groove 221 are arranged opposite to each other. The first groove 211 and the second groove 221 cooperate to form the mounting groove. The inner wall shape of the first groove 211 and the second groove 221 both match the outer wall shape of the cylinder 81 of the hydraulic motor 8. Specifically, in this embodiment, the first groove 211 and the second groove 221 are both set as semi-circular grooves.

[0058] Preferably, in this embodiment, the reference Figure 4 The upper pressure plate 21 has a plurality of second holes 213, and the lower pressure plate 22 has a plurality of third holes 222 that correspond to and cooperate with the second holes 213. The upper pressure plate 21 and the lower pressure plate 22 are fixedly connected by a second limiting member 2131. The second limiting member 2131 passes through the second holes 213 and is fixedly connected to the third holes 222. The cylinder body 81 is radially limited between the first groove 211 and the second groove 221. Specifically, the second limiting member 2131 is a second screw, and the second hole 213 and the third hole 222 are both screw holes. The second screw passes through the second hole 213 and is threaded into the third hole 222, so that the upper pressure plate 21 is close to the lower pressure plate 22, thereby clamping the cylinder 81. The threaded connection facilitates disassembly and assembly, and the threaded connection can effectively ensure the stability of the connection between the cylinder 81 and the motor pressure plate 2. During the installation process, the second screw does not need to be tightened too much, just maintain an appropriate tightness, so that a certain gap is maintained between the upper pressure plate 21 and the lower pressure plate 22. This is because one end of the hydraulic motor 8 is connected to the connecting device, the other end is connected to the load simulation mechanism, and the hydraulic motor 8 is also connected to the positioning component. This three-point support structure may have a slight verticality deviation during actual assembly, and it is difficult to completely guarantee the concentricity of the three support points. The reserved gap can effectively eliminate assembly stress and avoid damage to the hydraulic motor 8.

[0059] refer to Figure 1 and Figure 3 The load simulation mechanism includes a tailstock 4, a drive unit, and a connecting sleeve 43. The connecting sleeve 43 is fixedly connected to the connecting part 83 of the hydraulic motor 8. Specifically, the connecting sleeve 43 and the connecting part 83 are fixedly connected by a second pin 431. The connecting part 83 has a first through hole, and the connecting sleeve 43 has a second through hole. The second pin 431 passes through the second through hole and the first through hole from top to bottom and is fixedly connected by a nut to ensure a stable and reliable connection between the connecting sleeve 43 and the connecting part 83. The drive unit includes a hydraulic cylinder 3. The output end of the hydraulic cylinder 3 is poweredly connected to the connecting sleeve 43. The hydraulic cylinder 3 can apply tension along the axial direction of the hydraulic motor 8 and can drive the hydraulic motor 8 to move. A cylinder receiving plate 42 is fixedly connected to the upper end of the tailstock 4. One end of the hydraulic cylinder 3 away from the output end of the hydraulic cylinder 3 is fixedly connected to the cylinder receiving plate 42. Specifically, the hydraulic cylinder 3 and the cylinder receiving plate 42 are fixedly connected by a fifth screw 421 to ensure a stable and reliable connection.

[0060] An equivalent pulling force is applied to the hydraulic motor 8 along the axial direction by the hydraulic cylinder 3 to simulate the axial load force borne by the hydraulic motor 8. The pulling force generated by the hydraulic cylinder 3 is adjusted by controlling the oil pressure of the hydraulic oil entering the hydraulic cylinder 3. Specifically, the oil pressure value can be converted to obtain the actual axial load force value borne by the hydraulic motor 8.

[0061] The hydraulic cylinder 3 is threadedly connected to the connecting sleeve 43. Since it is a threaded connection, when not tightened, the connecting sleeve 43 can rotate 90 degrees along its own axis to adjust the appropriate angle for the installation of the hydraulic motor 8. The hydraulic motor 8 has a connecting part 83, which is connected to the connecting sleeve 43. After the connection is completed, the connecting sleeve 43 and the hydraulic cylinder 3 are tightened. The connecting part 83 has a first through hole, and the connecting sleeve 43 has a second through hole. The second pin 431 passes through the second through hole and the first through hole from top to bottom and is then fixed by a nut to ensure a stable and reliable connection between the connecting sleeve 43 and the connecting part 83.

[0062] refer to Figures 1-2The connecting device includes a first connecting plate 5, a second connecting plate 6, and a connecting shaft 7. The connecting shaft 7 is connected to the test bench. The first connecting plate 5 is fixedly connected to the output part 82 of the hydraulic motor 8. Specifically, the first connecting plate 5 and the hydraulic motor 8 are fixedly connected by a fourth screw 511 to ensure a stable and reliable connection between the first connecting plate 5 and the hydraulic motor 8. The screw connection also facilitates disassembly and assembly. The second connecting plate 6 is used for fixed connection to the test bench. The second connecting plate 6 and the test bench are fixedly connected by a sixth screw (not shown in the figure). The screw connection ensures a stable and reliable connection. The first connecting plate 5 can rotate relative to the second connecting plate 6. A gap is formed between the first connecting plate 5 and the second connecting plate 6 to avoid interference when the first connecting plate 5 rotates. One end of the connecting shaft 7 is fixedly connected to the first connecting plate 5. The connecting shaft 7 and the first connecting plate 5 are fixedly connected by a first pin 51 to ensure a stable and reliable connection. The other end of the connecting shaft 7 is rotatably inserted through the second connecting plate 6 and extends out of the second connecting plate 6 to cooperate with the test bench.

[0063] The output part 82 of the hydraulic motor 8 drives the first connecting plate 5 to rotate, and the rotation of the first connecting plate 5 drives the connecting shaft 7 to rotate synchronously. The test bench is equipped with several sensors, such as torque sensors and speed sensors. The sensors cooperate with the connecting shaft 7 to test the performance of the hydraulic motor 8.

[0064] Since there are many different models of hydraulic motors 8, and different models of motors have significant differences in size and axial length, in this embodiment, the first connecting plate 5 is a flange connecting plate. The flange connecting plate has various specifications to adapt to different specifications of hydraulic motors 8.

[0065] Preferably, in this embodiment, the reference Figures 4-5 The support component 1 serves as a support and includes a base 12 and a support frame 11. The positioning component is located on the support frame 11. The support frame 11 is slidably connected to the base 12. The support frame 11 and the positioning component also have various specifications to adapt to different specifications of hydraulic motors 8.

[0066] Preferably, in this embodiment, the reference Figures 4-5 The support frame 11 includes a first base plate 111, and the base 12 includes a second base plate 121. A sliding assembly is provided between the first base plate 111 and the second base plate 121. The first base plate 111 is slidably connected to the second base plate 121 through the sliding assembly. A thrust is provided by the hydraulic cylinder 3 to drive the movement of the hydraulic motor 8.

[0067] Preferably, in this embodiment, the reference Figures 4-5The sliding assembly includes a guide rail 13 and a guide rail groove 131. A guide rail block 1111 is fixedly disposed below the first base plate 111, and the guide rail groove 131 is located below the guide rail block 1111. The guide rail 13 is located on the second base plate 121. The guide rail 13 is slidably connected to the guide rail groove 131. The guide rail 13 and the guide rail groove 131 extend along the moving direction of the hydraulic motor 8.

[0068] Preferably, in this embodiment, the reference Figures 4-5 The sliding assembly further includes a slider 14 and a groove 141. The second base plate 121 has the groove 141, and the first base plate 111 is provided with a slider 14 that slides in cooperation with the groove 141. The slider 14 and the groove 141 extend along the moving direction of the hydraulic motor 8.

[0069] Preferably, in this embodiment, the reference Figures 1-2 The second connecting plate 6 is connected to a first bearing 61, which is sleeved on the outside of the connecting shaft 7. The second connecting plate 6 has a first limiting step 611, and the connecting shaft 7 has a limiting part 71. The first bearing 61 is axially limited between the first limiting step 611 and the limiting part 71, effectively restricting the movement of the first bearing 61. The first bearing 61 is a planar bearing. When the hydraulic cylinder 3 is working and the hydraulic motor 8 is simulating a load, the planar bearing can withstand lateral tension.

[0070] Preferably, in this embodiment, the reference Figures 1-2 The second connecting plate 6 also has a second bearing 62 and a snap-fit ​​member 63 connected inside. The second bearing 62 is sleeved on the outside of the connecting shaft 7. The second connecting plate 6 has a second limiting step 621. The second bearing 62 is axially limited between the second limiting step 621 and the snap-fit ​​member 63, which effectively restricts the movement of the second bearing 62. The second bearing 62 is a deep groove ball bearing, which can reduce the friction of the connecting shaft 7 and improve the service life of the connecting shaft 7.

[0071] The installation and testing process is as follows: The hydraulic motor 8 is fixedly connected to the connecting sleeve 43. Hydraulic oil is pumped into the hydraulic cylinder 3 to push the hydraulic motor 8 to move and press against the first connecting plate 5 to eliminate gaps. After pressing, the hydraulic motor 8 is fixedly connected to the first connecting plate 5 through the fourth screw 511. After the connection is completed, the hydraulic motor 8 is pulled by the hydraulic cylinder 3 so that the hydraulic motor 8 is located in the mounting groove of the motor pressure plate 2. Then, the hydraulic motor 8 is limited to the mounting groove by the first limiting member 2121 and the second limiting member 2131. After the clamping device ensures that the hydraulic motor 8 is installed in place with the test bench, the test is carried out. The output part 82 of the hydraulic motor 8 starts to rotate, driving the first connecting plate 5 and the connecting shaft 7 to rotate synchronously. The hydraulic cylinder 3 continuously applies tension along the axial direction of the hydraulic motor 8 to simulate the load. The connecting shaft 7 is connected to the test bench to test the working performance of the hydraulic motor 8 under heavy load conditions.

[0072] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A clamping device for hydraulic motor testing, characterized in that, The utility model relates to a load simulation test device, including: A fixing device, the fixing device includes a support assembly (1) and a positioning assembly connected to the support assembly (1), a hydraulic motor (8) is installed to the positioning assembly, the positioning assembly at least restricts rotation of the hydraulic motor (8) in the circumferential direction; A load simulation mechanism, including driving device and connecting sleeve (43), the connecting sleeve (43) is fixedly connected with the hydraulic motor (8), the driving device includes hydraulic cylinder (3), the output end of hydraulic cylinder (3) is power connected with connecting sleeve (43), and hydraulic cylinder (3) applies tension along the axial direction of hydraulic motor (8) and can drive the hydraulic motor (8) to move; Connecting device, including first connecting plate (5), second connecting plate (6) and connecting shaft (7), the first connecting plate (5) is fixedly connected with the output part (82) of hydraulic motor (8), the first connecting plate (5) can rotate relative to second connecting plate (6), one end of connecting shaft (7) is fixedly connected with first connecting plate (5), the other end of connecting shaft (7) is rotatably arranged in second connecting plate (6) and extends outside the second connecting plate (6), and the connecting shaft (7) is connected to the test bench, and the second connecting plate (6) is used to be fixedly connected with the test bench.

2. A clamping device for testing a hydraulic motor according to claim 1, characterized in that: The support assembly (1) includes a base (12) and a support frame (11), the positioning assembly is located on the support frame (11), and the support frame (11) is slidably connected to the base (12).

3. A clamping device for testing a hydraulic motor according to claim 2, characterized in that: The support frame (11) includes a first bottom plate (111), the base (12) includes a second bottom plate (121), and a sliding assembly is arranged between the first bottom plate (111) and the second bottom plate (121).

4. The clamping device for testing a hydraulic motor according to claim 3, wherein: The sliding assembly includes a guide rail (13) and a guide rail groove (131), the first bottom plate (111) is provided with the guide rail groove (131) below, the second bottom plate (121) is provided with the guide rail (13), the guide rail (13) is slidably connected into the guide rail groove (131), and the guide rail (13) and the guide rail groove (131) extend along the moving direction of the hydraulic motor (8).

5. A clamping device for testing a hydraulic motor according to claim 4, characterized in that: The sliding assembly further includes a sliding block (14) and a sliding groove (141), the second bottom plate (121) is provided with the sliding groove (141), the first bottom plate (111) is provided with the sliding block (14) that is slidably matched with the sliding groove (141), and the sliding block (14) and the sliding groove (141) extend along the moving direction of the hydraulic motor (8).

6. The clamping device for testing a hydraulic motor of claim 1, wherein: The positioning assembly comprises a motor pressing plate (2) having a mounting groove, the hydraulic motor (8) comprises a cylinder (81) which is limited in the mounting groove, the motor pressing plate (2) has a first hole (212) which penetrates the mounting groove in the radial direction, a first limiting piece (2121) is connected in the first hole (212), and the first limiting piece (2121) is in limiting cooperation with the outer peripheral wall of the cylinder (81) to limit the rotation of the cylinder (81) around its axis.

7. A clamping device for testing a hydraulic motor according to claim 6, characterized in that: The motor pressing plate (2) comprises an upper pressing plate (21) and a lower pressing plate (22), the upper pressing plate (21) has a first groove (211), the lower pressing plate (22) has a second groove (221), the first groove (211) and the second groove (221) are oppositely arranged, and the first groove (211) and the second groove (221) cooperatively form the mounting groove.

8. A clamping device for testing a hydraulic motor according to claim 7, characterized in that: The upper pressing plate (21) has a plurality of second holes (213), the lower pressing plate (22) has a plurality of third holes (222) corresponding to the second holes (213), the upper pressing plate (21) and the lower pressing plate (22) are fixedly connected through a second limiting piece (2131), and the second limiting piece (2131) is fixedly connected to the third holes (222) through the second holes (213).

9. The clamping device for testing a hydraulic motor of claim 1, wherein: The second connecting plate (6) is connected with a first bearing (61), the first bearing (61) is sleeved outside the connecting shaft (7), the second connecting plate (6) has a first limiting step (611), the connecting shaft (7) has a limiting portion (71), and the first bearing (61) is axially limited between the first limiting step (611) and the limiting portion (71).

10. The clamping device for testing a hydraulic motor according to claim 9, wherein: The second connecting plate (6) is further connected with a second bearing (62) and a clamping piece (63), the second bearing (62) is sleeved outside the connecting shaft (7), the second connecting plate (6) has a second limiting step (621), and the second bearing (62) is axially limited between the second limiting step (621) and the clamping piece (63).

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