A hydraulic motor torque test system and test method

Abstract

The present invention relates to a hydraulic motor torque test system and test method, and relates to the technical field of motor testing; it includes a fixed base, and the upper end of the fixed base is sequentially provided with a motor clamping assembly and a test assembly along its length direction, and the test assembly includes an existing torque acquisition device known to be used for detecting the torque of the hydraulic motor, and a positioning assembly is provided on the side of the torque acquisition device close to the motor clamping assembly; the present invention can solve the following problems existing in the prior art: in the prior art, the installation position of the hydraulic motor is prone to offset during a long-term test, which affects the stability of torque detection. In addition, the installation steps of the motor are relatively cumbersome, and the test efficiency is low when testing large quantities or motors of multiple specifications; secondly, when the output shaft of the motor is connected to the torque acquisition device, deviations in the horizontal or height direction are likely to occur, resulting in the two being not on the same axis, thereby affecting the accuracy of torque measurement.

Description

Technical Field

[0001] The present invention relates to the technical field of motor testing, and in particular to a hydraulic motor torque testing system and a testing method. Background Art

[0002] Hydraulic motors are key actuators in hydraulic systems, converting the hydraulic energy provided by a hydraulic pump into mechanical energy (torque and speed) at their output shafts. They are widely used in injection molding machinery, ships, hoisting machinery, construction machinery, and other fields. The output torque of a hydraulic motor is a key performance parameter. Under the same inlet and outlet pressure differential, the greater the motor's output torque, the higher its mechanical and overall efficiency. Both factory and type testing of motors require measurement of output torque at various speeds and inlet and outlet pressure differentials.

[0003] In the existing motor torque testing system, such as the Chinese patent with publication number CN209894484U, a motor torque testing device is disclosed, including a base, a vertical plate is vertically fixed to the top surface of the base on one side of the base, a motor is movably placed on the top of the placement frame, the rotating end of the motor is fixedly installed with a torque sensor through a vertical slot provided on the side wall of the vertical plate through a coupling, the torque sensor is fixedly installed on the top surface of the base, and the torque sensor is fixedly installed with a magnetic powder clutch fixedly installed on the top surface of the base through a coupling, the height adjustment device includes four connecting ears fixedly installed on the side wall of the placement frame, one end of the rope is tied to the connecting ear, and the other end of the rope is tied to a ring, the top surface of the ring is provided with several fixing rods distributed in a ring, the top end of the fixing rod is fixedly connected to the bottom surface of the disc, the top surface of the disc is fixedly provided with a lifting ear, the lifting ear is fixedly connected to the lifting rope of the rope winder, the rope winder is fixedly installed on the top surface of the horizontal plate, and the side wall of the horizontal plate is vertically welded to the upper end side wall of the vertical plate.

[0004] However, the above motor torque test system still has some shortcomings in actual use:

[0005] 1. In the prior art, the height of the motor and the torque sensor is adjusted by height adjustment to avoid the motor being installed too high or too low, which makes it inconvenient to connect the rotating end of the motor to the torque sensor. In addition, in order to facilitate the transportation and installation of the motor, the starting position of the placement rack is usually located on the top surface of the base. If the placement rack is installed in other positions, it will not only increase the risk to personnel during the hoisting and transportation of the motor, but also reduce the installation efficiency; however, in the above-mentioned prior art, the motor is placed on the roller on the placement rack. Therefore, during the process of raising and lowering the placement rack, the motor on the roller on the placement rack will swing left and right, resulting in the motor and the torque sensor being unable to be quickly connected, affecting the installation efficiency.

[0006] 2. Current technology directly secures the motor output end to the torque sensor when it is connected. Although the motor is aligned with the torque sensor after being raised or lowered, the motor output shaft and the components connecting the torque sensor may deviate vertically or horizontally. This means the two are not aligned on the same central axis. Consequently, there may be some coaxiality deviation between the two after installation, affecting the accuracy of torque measurement. Large coaxiality deviations can also cause varying degrees of damage to the motor and torque sensor under high speed or high torque conditions.

[0007] Therefore, based on the above-stated viewpoint, there is still room for improvement in the existing motor torque testing system. Summary of the Invention

[0008] In order to solve the above problems, the present invention provides a hydraulic motor torque testing system and testing method.

[0009] A hydraulic motor torque testing system includes a fixed base, wherein the upper end of the fixed base is provided with a motor clamping assembly and a test assembly in sequence along its length direction, wherein: the test assembly includes a torque acquisition device known in the art for detecting the torque of a hydraulic motor, and a positioning assembly is provided on the side of the torque acquisition device close to the motor clamping assembly.

[0010] The positioning assembly includes vertical plates symmetrically arranged along the width direction at the upper end of the fixed base, and a circular fixing ring is provided on the side where the two vertical plates are close to each other. Positioning springs are fixedly installed between the circular fixing ring and the two vertical plates, and a positioning sleeve is slidably installed on the inner side of the circular fixing ring along its length direction. The end of the positioning sleeve close to the motor clamping assembly is a conical structure, and its inner diameter gradually becomes larger towards the end close to the motor clamping assembly.

[0011] Preferably, the motor clamping assembly includes a support frame fixedly connected to the upper end of the fixed base, two groups of guide columns distributed along the length direction of the fixed base are fixedly installed on the support frame, and the two groups of guide columns are slidably installed on both sides of the fixed base. The two groups of clamping plates are fixedly connected to the opposite sides of the clamping plates with horizontal cross plates for placing the hydraulic motors, and the opposite sides of the clamping plates are also provided with telescopic grooves at equal intervals, and a telescopic spring is fixedly installed in the telescopic groove, and a serrated block that slides along the telescopic groove is fixedly connected to the telescopic spring.

[0012] A threaded hole is opened in the middle of the two groups of clamping plates, and an adjusting threaded rod is installed in the threaded hole through a threaded connection. The adjusting threaded rod is rotatably installed on the upper end of the fixed base through a support, and a rotating handle is fixedly installed on one side of the adjusting threaded rod.

[0013] Preferably, a sliding groove is provided on one side opposite to the two groups of horizontal transverse plates, a telescopic plate is slidably installed in the sliding groove, and a return compression spring is connected between the telescopic plate and the inner wall of the sliding groove of the horizontal transverse plate.

[0014] Preferably, a center axis fine-tuning module for coaxially positioning the test assembly and the output shaft of the hydraulic motor is provided at one end of the positioning sleeve close to the motor clamping assembly. The center axis fine-tuning module includes guide bars hingedly installed at equal intervals along the circumferential direction of the inner wall of the positioning sleeve close to the motor clamping assembly, and a fine-tuning compression spring is connected between the guide bar and the inner wall of the positioning sleeve.

[0015] The positioning sleeve is fixedly installed with two groups of connecting frames distributed up and down at one end away from the motor clamping assembly. A telescopic circular hole is provided on the connecting frame. A telescopic column is slidably installed in the telescopic circular hole. The two groups of telescopic columns are commonly connected to the execution plate. The positioning sleeve is provided with a telescopic groove for the execution plate to slide along the length direction of the positioning sleeve.

[0016] A telescopic compression spring is fixedly installed on one end of the execution plate away from the telescopic column, and the other end of the telescopic compression spring away from the execution plate is fixedly connected to the positioning pin.

[0017] Preferably, the end of the telescopic column away from the actuator plate is linked to a clamping unit, and the clamping unit includes a clamping rod slidably installed on the positioning sleeve along the circumferential direction, a mounting block is fixed to the middle part of one side of the clamping rod, and a traction rope is connected to the mounting block, and the end of the traction rope away from the mounting block is fixedly connected to a fixing plate, and the fixing plate is connected to the end of the telescopic column away from the actuator plate, and a plurality of guide rollers fixed to the inner wall of the positioning sleeve are rotatably connected to the outer wall of the positioning sleeve, and the traction rope is sleeved on the guide rollers.

[0018] The top of the clamping rod is fixedly connected with a connecting spring, and one end of the connecting spring away from the clamping rod is fixedly mounted with a connecting plate, and the connecting plate is mounted on the positioning sleeve.

[0019] Preferably, the fixed base is provided with a long movable groove along its length direction, a movable plate is slidably installed in the long movable groove, and the upper end of the movable plate is connected to the vertical plate.

[0020] Preferably, a disc-type torque collection device is fixed to one end of the positioning sleeve close to the execution plate, and the disc-type torque collection device is connected to the torque collection device via a data line.

[0021] In addition, the present invention also provides a hydraulic motor torque test method, as shown below:

[0022] S1. Motor Fixing: The hydraulic motor to be tested is placed on the horizontal plate of the motor clamping assembly. The operator then rotates the adjusting threaded rod to drive the clamping plate to clamp the hydraulic motor in the center of the horizontal plate. At the same time, the serrated block on the clamping plate limits the horizontal direction of the hydraulic motor to ensure the stability of the hydraulic motor.

[0023] S2. Preliminary positioning: After the hydraulic motor is fixed, the operator pushes the movable plate toward the hydraulic motor, so that the entire positioning sleeve moves toward the output shaft of the hydraulic motor until the positioning sleeve is completely sleeved on the output shaft of the hydraulic motor. At this point, the preliminary positioning of the output shaft of the hydraulic motor and the positioning sleeve is completed;

[0024] S3. Precise positioning: When the operator pushes the movable plate toward the hydraulic motor, the output shaft of the hydraulic motor, under the action of the guide strip inside the positioning sleeve, fine-tunes the position of the positioning sleeve, so that the positioning pin inside it abuts against the central axis of the hydraulic motor output shaft. The positioning pin is then squeezed by the hydraulic motor output shaft, causing it to be compressed. During this process, the clamping rod clamps and fixes the hydraulic motor output shaft that enters the positioning sleeve. At this time, the hydraulic motor output shaft and the positioning sleeve are fixed, and both are on the same central axis.

[0025] S4. Torque test: After the output shaft of the hydraulic motor is positioned with the positioning sleeve, the operator starts the hydraulic motor to test its torque.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. The present invention can quickly fix the hydraulic motor placed on the horizontal cross plate through the cooperation between the clamping plate and the horizontal cross plate, and at the same time adjust the position of the hydraulic motor so that it is always in a centered state, thereby ensuring the stability of the hydraulic motor clamping and ensuring that the output shaft and positioning collar of the subsequent hydraulic motor can be quickly fixed.

[0028] 2. The present invention ensures that the positioning sleeve can be fine-tuned within a certain range through the cooperation between the positioning pin and the guide bar, so that the output shaft of the hydraulic motor and the positioning collar are on the same central axis, ensuring the coaxiality of the two and reducing the deviation in torque measurement caused by the vertical or horizontal deviation between the two due to installation.

[0029] 3. When the coaxiality of the output shaft of the hydraulic motor and the positioning collar is adjusted, the present invention effectively ensures that the two are linked and fixed, thereby significantly improving the detection efficiency of the torque of the hydraulic motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below with reference to the accompanying drawings and examples.

[0031] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0032] Figure 2 It is a structural schematic diagram of the motor clamping assembly of the present invention.

[0033] Figure 3 It is a structural schematic diagram of the horizontal cross plate of the present invention.

[0034] Figure 4 It is a structural schematic diagram of the positioning component of the present invention.

[0035] Figure 5 It is a structural schematic diagram of the central axis fine-tuning module of the present invention.

[0036] Figure 6 It is a first-perspective structural diagram between the central axis fine-tuning module and the clamping unit of the present invention.

[0037] Figure 7 It is a structural schematic diagram of the clamping unit of the present invention.

[0038] Figure 8 It is a second perspective structural diagram between the central axis fine-tuning module and the clamping unit of the present invention.

[0039] Figure 9 It is a flow chart of the hydraulic motor torque testing method of the present invention.

[0040] In the figure, A, hydraulic motor; 1, fixed base; 2, motor clamping assembly; 3, test assembly; 4, torque acquisition device; 5, positioning assembly; 50, vertical plate; 51, circular fixing ring; 52, positioning spring; 53, positioning sleeve; 20, support frame; 21, guide column; 22, clamping plate; 23, horizontal cross plate; 24, adjusting threaded rod; 25, turning handle; 26, telescopic spring; 27, serrated block; 230, telescopic plate ;231. Reset compression spring; 6. Center axis fine-tuning module; 60. Guide bar; 61. Fine-tuning compression spring; 62. Connecting frame; 63. Telescopic column; 64. Actuator plate; 65. Telescopic compression spring; 66. Positioning pin; 7. Clamping unit; 70. Clamping rod; 71. Mounting block; 72. Traction rope; 73. Guide roller; 74. Connecting spring; 75. Connecting plate; 76. Fixed plate; 80. Moving plate; 90. Disc-type torque acquisition device. DETAILED DESCRIPTION

[0041] The following is combined with Figures 1-9 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.

[0042] The embodiments of the present application disclose a hydraulic motor torque testing system and test method, which explains that the torque testing system of the hydraulic motor A is mainly used in the process of detecting the torque of the motor. In terms of technical effect, it can avoid the problem that the coaxiality tolerance between the output shaft of the motor and the detector affects the accuracy of the motor torque test due to the deviation between the output shaft of the motor and the detector in the vertical or horizontal direction; especially when testing the motor, the installation stability between the output end of the motor and the detector is poor, which can easily lead to separation between the two, thereby damaging the equipment and even causing safety accidents.

[0043] Example 1:

[0044] See Figure 1 As shown, a torque testing system and test method for a hydraulic motor A include a fixed base 1, an upper end of the fixed base 1 is provided with a motor clamping assembly 2 and a test assembly 3 in sequence along its length direction, the test assembly 3 includes an existing torque acquisition device 4 known for detecting the torque of the hydraulic motor A, and a positioning assembly 5 is provided on the side of the torque acquisition device 4 close to the motor clamping assembly 2.

[0045] In this embodiment, when the operator performs a torque test on the hydraulic motor A, he first clamps and fixes it through the motor clamping assembly 2. After it is fixed, it is tested through the testing assembly 3. However, before the test, it is necessary to first ensure that the output end of the hydraulic motor A is fixedly connected to the positioning sleeve 53 on the torque acquisition device 4 so that the two are on the same central axis, thereby ensuring that the coaxiality of the output shaft of the hydraulic motor A and the positioning sleeve 53 on the torque acquisition device 4 remains highly consistent, thereby improving the accuracy of its torque detection.

[0046] See Figure 2 and Figure 3 As shown, the motor clamping assembly 2 includes a support frame 20 fixedly connected to the upper end of the fixed base 1, and two groups of guide columns 21 distributed along the length direction of the fixed base 1 are fixedly installed on the support frame 20. The two groups of guide columns 21 are jointly slidably installed on the clamping plates 22 distributed symmetrically on both sides of the width direction of the fixed base 1. The opposite sides of the two groups of clamping plates 22 are fixedly connected with horizontal cross plates 23 for placing the hydraulic motor A.

[0047] A threaded hole is opened in the middle of the two groups of clamping plates 22, and an adjusting threaded rod 24 is installed in the threaded hole by a threaded connection. The adjusting threaded rod 24 is rotatably installed on the upper end of the fixed base 1 through a support, and a rotating handle 25 is fixedly installed on one side of the adjusting threaded rod 24.

[0048] It should be noted that the adjusting threaded rod 24 is a symmetrically distributed bidirectional thread structure.

[0049] The operator then places the hydraulic motor A on the horizontal cross plate 23 on the two clamping plates 22, and supports the hydraulic motor A through the horizontal cross plate 23. The operator then rotates the adjusting threaded rod 24. During the rotation, the adjusting threaded rod 24 drives the two symmetrically distributed clamping plates 22 connected by threads on the drive to move relative to each other until the two clamping plates 22 clamp the outer wall of the hydraulic motor A, thereby fixing the hydraulic motor A.

[0050] The rotation adjustment threaded rod 24 is adjusted by a rotation handle 25 to provide a desired rotation rate.

[0051] A telescopic spring 27 is fixedly installed in the telescopic groove, and a serrated block 26 that slides along the telescopic groove is fixedly connected to the telescopic spring 27; when the clamping plate 22 clamps the hydraulic motor A longitudinally, the hydraulic motor A may vibrate horizontally due to vibration during the torque detection process, causing itself to shift. Therefore, in the present invention, after the clamping plate 22 fixes the hydraulic motor A, the serrated block 26 on the clamping plate 22 will limit the hydraulic motor A.

[0052] During this process, the clamping plate 22 clamps the hydraulic motor A longitudinally, and the serrated block 26 in the clamping plate 22 that contacts the side wall of the hydraulic motor A will retract into the telescopic groove, while the serrated block 26 in the clamping plate 22 that is longer than the hydraulic motor A will extend out of the telescopic groove. The extended serrated block 26 will rest against the left and right sides of the hydraulic motor A to limit the hydraulic motor A.

[0053] Look again Figure 2 and Figure 3 The figure shows a schematic diagram of the structure of the horizontal cross plate 23; a slide groove is provided on the opposite side of the two sets of horizontal cross plates 23, and a telescopic plate 230 is slidably installed in the slide groove, and a return compression spring 231 is connected between the telescopic plate 230 and the inner wall of the slide groove of the horizontal cross plate 23.

[0054] In the initial state, the two horizontal cross plates 23 are against each other. At this time, when the operator places the hydraulic motor A, the hydraulic motor A can be placed at any position on the horizontal cross plate 23, and it can be supported by the horizontal cross plate 23. Then, when the operator rotates the adjustment threaded rod 24, the two clamping plates 22 can be driven to move synchronously relative to each other. Therefore, the two clamping plates 22 can adjust the position of the hydraulic motor A so that it is located in the middle of the entire equipment, preparing for the subsequent output end of the hydraulic motor A and the ability to quickly position it.

[0055] This embodiment can not only clamp the hydraulic motor A in the center, but also clamp and fix hydraulic motors A of different sizes, thereby effectively ensuring that hydraulic motors A of different sizes can be clamped, greatly improving the applicability of the present invention.

[0056] See Figure 4 and Figure 5 The figure shows a schematic diagram of the structure for the fixed connection between the output end of the hydraulic motor A and the torque acquisition device 4; the positioning assembly 5 includes a vertical plate 50 symmetrically arranged along the width direction on the upper end of the fixed base 1, and a circular fixing ring 51 is arranged on the side where the two vertical plates 50 are close to each other, and a positioning spring 52 is fixedly installed between the circular fixing ring 51 and the two vertical plates 50, and a positioning sleeve 53 is slidably installed on the inner side of the circular fixing ring 51 along its length direction, and the positioning sleeve 53 has a conical structure at one end close to the motor clamping assembly 2, and its inner diameter gradually becomes larger at the end close to the motor clamping assembly 2.

[0057] The fixed base 1 is provided with a long movable groove along its length, in which a movable plate 80 is slidably installed, and the upper end of the movable plate 80 is connected to the vertical plate 50 .

[0058] After the hydraulic motor A is fixed, the operator pushes the movable plate 80 to move the movable plate 80 toward the hydraulic motor A until the positioning sleeve 53 is sleeved on the output shaft of the hydraulic motor A. During the process of the positioning sleeve 53 being sleeved on the output shaft of the hydraulic motor A, the positioning sleeve 53 is synchronously adjusted in position.

[0059] One end of the positioning sleeve 53 close to the motor clamping assembly 2 is a tapered structure, the main purpose of which is to position and fix the output shaft of the hydraulic motor A with different diameters, thereby greatly improving the applicability of this embodiment.

[0060] See Figure 5 and Figure 6 The figure shows a structural diagram for fine-tuning the positioning sleeve 53 and the hydraulic motor A so that the central axis of the output end of the hydraulic motor A coincides with the central axis of the positioning sleeve 53; a central axis fine-tuning module 6 for coaxially positioning the test assembly 3 and the output shaft of the hydraulic motor A is provided at one end of the positioning sleeve 53 close to the motor clamping assembly 2, and the central axis fine-tuning module 6 includes a guide bar 60 hingedly installed at equal intervals along the circumferential direction of the inner wall of the positioning sleeve 53 close to the motor clamping assembly 2, and a fine-tuning compression spring 61 is connected between the guide bar 60 and the inner wall of the positioning sleeve 53.

[0061] Two groups of connecting frames 62 distributed vertically are fixedly installed on one end of the positioning sleeve 53 away from the motor clamping assembly 2. A telescopic circular hole is provided on the connecting frame 62, and a telescopic column 63 is slidably installed in the telescopic circular hole. The two groups of telescopic columns 63 are commonly connected to the actuator plate 64, and a telescopic groove is provided on the positioning sleeve 53 for the actuator plate 64 to slide along the length direction of the positioning sleeve 53.

[0062] A telescopic compression spring 65 is fixedly mounted on one end of the actuator plate 64 away from the telescopic column 63 , and another end of the telescopic compression spring 65 away from the actuator plate 64 is fixedly connected to a positioning pin 66 .

[0063] When the positioning sleeve 53 approaches the output end of the hydraulic motor A, the guide bar 60 inside the positioning sleeve 53 squeezes the hydraulic motor A, and then the entire positioning sleeve 53 begins to adjust its position under the action of the positioning spring 52, so that the positioning sleeve 53 is always on the same central axis as the output shaft of the hydraulic motor A. As the positioning sleeve 53 continues to approach the output end of the hydraulic motor A, the positioning pin 66 in the middle of the inner side of the positioning sleeve 53 rests against the groove on the front side of the output end of the hydraulic motor A.

[0064] See Figure 6 、 Figure 7 and Figure 8 The figure is a structural diagram of the connection between the positioning sleeve 53 and the output end of the hydraulic motor A; the end of the telescopic column 63 away from the actuator plate 64 is linked to a clamping unit 7, and the clamping unit 7 includes a clamping rod 70 slidably installed on the positioning sleeve 53 along the circumferential direction, and a mounting block 71 is fixed to the middle part of one side of the clamping rod 70, and a traction rope 72 is connected to the mounting block 71. The end of the traction rope 72 away from the mounting block 71 is fixedly connected to a fixing plate 76, and the fixing plate 76 is connected to the end of the telescopic column 63 away from the actuator plate 64. A plurality of guide rollers 73 fixed to the inner wall of the positioning sleeve 53 are rotatably connected to the outer wall of the positioning sleeve 53, and the traction rope 72 is sleeved on the guide rollers 73.

[0065] A connecting spring 74 is fixedly connected to the top of the clamping rod 70 . A connecting plate 75 is fixedly mounted on one end of the connecting spring 74 away from the clamping rod 70 . The connecting plate 75 is mounted on the positioning sleeve 53 .

[0066] After the positioning pin 66 rests against the output shaft of the hydraulic motor A, the operator continues to push the movable plate 80 toward the direction of the hydraulic motor A. At this time, the positioning pin 66 encounters resistance and begins to move to the side opposite to the direction of movement of the movable plate 80. At the same time, the positioning pin 66 squeezes the telescopic compression spring 65 until the telescopic compression spring 65 reaches the maximum compression external force. Then, the positioning pin 66 begins to squeeze the actuator plate 64, driving the actuator plate 64 to drive the telescopic column 63 to move toward the end away from the positioning sleeve 53.

[0067] At the same time, the telescopic column 63 begins to pull the traction rope 72, which is in a straight state in the initial state. After one end of the traction rope 72 is subjected to external force, the other end of the traction rope 72 moves synchronously. Therefore, the traction rope 72 pulls the clamping rod 70 toward the inner side of the positioning sleeve 53 until the clamping rod 70 rests on the output end of the hydraulic motor A. At this time, the operator stops pushing the movable plate 80, thereby completing the rapid positioning and fixation of the output shaft of the hydraulic motor A and the positioning sleeve 53.

[0068] See Figure 8As shown, a disc-type torque collection device 90 is fixed to the end of the positioning sleeve 53 near the actuator plate 64. The disc-type torque collection device 90 is wirelessly connected to the torque collection device 4. After the output shaft of the hydraulic motor A is quickly fixed to the positioning sleeve 53, the hydraulic motor A is started. During the rotation of the hydraulic motor A, the disc-type torque collection device 90 is driven by the positioning sleeve 53. The disc-type torque collection device 90 then detects the torque of the hydraulic motor A and transmits the detection data to the torque collection device 4.

[0069] Torque is a word used to express rotational force. If the rotational force can be measured, the torque can be understood. After understanding the force generated by the hydraulic motor at an instant, the operator can calculate the torque at that moment.

[0070] See Figure 9 As shown, a torque test system for a hydraulic motor A is characterized by: a torque test method for a hydraulic motor A is as follows:

[0071] S1. Motor fixing: Place the hydraulic motor to be tested on the horizontal cross plate 23 of the motor clamping assembly 2. Then the operator rotates the adjusting threaded rod 24 to drive the clamping plate 22 to clamp the hydraulic motor on the horizontal cross plate 23 in the center. At the same time, the serrated block 26 on the clamping plate 22 limits the horizontal direction of the hydraulic motor to ensure the stability of the hydraulic motor.

[0072] S2. Preliminary positioning: After the hydraulic motor is fixed, the operator pushes the movable plate 80 toward the hydraulic motor, so that the entire positioning sleeve 53 moves toward the output shaft of the hydraulic motor until the positioning sleeve 53 is completely sleeved on the output shaft of the hydraulic motor. At this time, the preliminary positioning of the hydraulic motor output shaft and the positioning sleeve 53 is completed.

[0073] S3. Precise positioning: When the operator pushes the movable plate 80 toward the hydraulic motor, the output shaft of the hydraulic motor fine-tunes the position of the positioning sleeve 53 under the action of the guide bar 60 in the positioning sleeve 53, so that the positioning pin 66 inside it abuts against the central axis of the hydraulic motor output shaft. Then, the positioning pin 66 is squeezed by the hydraulic motor output shaft, causing the positioning pin 66 to be compressed. During this process, the clamping rod 70 clamps and fixes the hydraulic motor output shaft entering the positioning sleeve 53. At this time, the hydraulic motor output shaft and the positioning sleeve 53 are fixed, and the two are on the same central axis.

[0074] S4. Torque test: After the output shaft of the hydraulic motor is positioned with the positioning sleeve 53, the operator starts the hydraulic motor to test its torque.

[0075] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0076] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A hydraulic motor torque test system, comprising a fixed base (1), characterized in that: The upper end of the fixed base (1) is provided with a motor clamping assembly (2) and a test assembly (3) in sequence along its length direction, wherein: the test assembly (3) comprises a torque acquisition device (4) known in the art for detecting the torque of a hydraulic motor, and a positioning assembly (5) is provided on one side of the torque acquisition device (4) close to the motor clamping assembly (2); The positioning assembly (5) comprises a vertical plate (50) symmetrically arranged along the width direction at the upper end of the fixed base (1), a circular fixing ring (51) is arranged on the side where the two vertical plates (50) are close to each other, and a positioning spring (52) is fixedly installed between the circular fixing ring (51) and the two vertical plates (50), and a positioning sleeve (53) is slidably installed on the inner side of the circular fixing ring (51) along its length direction, and the end of the positioning sleeve (53) close to the motor clamping assembly (2) is a conical structure, and its inner diameter gradually increases towards the end close to the motor clamping assembly (2); A center axis fine-tuning module (6) for coaxially positioning the test assembly (3) and the output shaft of the hydraulic motor is arranged at one end of the positioning sleeve (53) close to the motor clamping assembly (2), and the center axis fine-tuning module (6) comprises guide bars (60) hingedly mounted at equal intervals along the circumferential direction of the inner wall of the positioning sleeve (53) close to the motor clamping assembly (2), and a fine-tuning compression spring (61) is connected between the guide bar (60) and the inner wall of the positioning sleeve (53); Two groups of connecting frames (62) distributed up and down are fixedly installed on one end of the positioning sleeve (53) away from the motor clamping assembly (2), and a telescopic circular hole is provided on the connecting frame (62), and a telescopic column (63) is slidably installed in the telescopic circular hole. The two groups of telescopic columns (63) are commonly connected to an actuator plate (64), and a telescopic groove is provided on the positioning sleeve (53) for the actuator plate (64) to slide along the length direction of the positioning sleeve (53); A telescopic compression spring (65) is fixedly installed on one end of the actuator plate (64) away from the telescopic column (63), and a positioning pin (66) is fixedly connected to one end of the telescopic compression spring (65) away from the actuator plate (64); The end of the telescopic column (63) away from the actuator plate (64) is linked to a clamping unit (7), the clamping unit (7) comprises a clamping rod (70) slidably mounted on the positioning sleeve (53) along the circumferential direction, a mounting block (71) is fixed in the middle of one side of the clamping rod (70), a traction rope (72) is connected to the mounting block (71), the end of the traction rope (72) away from the mounting block (71) is fixedly connected to a fixing plate (76), the fixing plate (76) is connected to the end of the telescopic column (63) away from the actuator plate (64), a plurality of guide rollers (73) fixed to the inner wall of the positioning sleeve (53) are rotatably connected to the outer wall of the positioning sleeve (53), and the traction rope (72) is sleeved on the guide rollers (73); A connecting spring (74) is fixedly connected to the top of the clamping rod (70), and a connecting plate (75) is fixedly installed at one end of the connecting spring (74) away from the clamping rod (70), and the connecting plate (75) is installed on the positioning sleeve (53).

2. A hydraulic motor torque testing system according to claim 1, characterized in that: The fixed base (1) is provided with a long movable groove along its length direction, and a movable plate (80) is slidably installed in the long movable groove, and the upper end of the movable plate (80) is connected to the vertical plate (50).

3. A hydraulic motor torque testing system according to claim 2, characterized in that: The motor clamping assembly (2) comprises a support frame (20) fixedly connected to the upper end of the fixed base (1), the support frame (20) being fixedly mounted with two groups of guide columns (21) distributed along the length direction of the fixed base (1), the two groups of guide columns (21) being slidably mounted together with clamping plates (22) symmetrically distributed along the width direction of the fixed base (1), the two groups of clamping plates (22) being fixedly connected to opposite sides with horizontal cross plates (23) for placing the hydraulic motor, the opposite sides of the clamping plates (22) being also provided with telescopic grooves at equal intervals, the telescopic grooves being fixedly mounted with telescopic springs (27), the telescopic springs (27) being fixedly connected with sawtooth blocks (26) sliding along the telescopic grooves; A threaded hole is provided in the middle of the two groups of clamping plates (22), and an adjusting threaded rod (24) is installed in the threaded hole by means of a threaded connection. The adjusting threaded rod (24) is rotatably installed on the upper end of the fixed base (1) through a support, and a rotating handle (25) is fixedly installed on one side of the adjusting threaded rod (24).

4. A hydraulic motor torque testing system according to claim 3, characterized in that: A slide groove is provided on one side opposite to the two groups of horizontal cross plates (23), in which a telescopic plate (230) is slidably installed, and a return compression spring (231) is connected between the telescopic plate (230) and the inner wall of the slide groove of the horizontal cross plate (23).

5. A hydraulic motor torque testing system according to claim 2, characterized in that: A disc-type torque collection device (90) is fixed to one end of the positioning sleeve (53) close to the actuator plate (64), and the disc-type torque collection device (90) is wirelessly connected to the torque collection device (4).

6. A method for testing torque of a hydraulic motor, comprising a hydraulic motor torque testing system as claimed in any one of claims 2 to 5, characterized in that: The hydraulic motor torque test method is as follows: S1. Motor fixing: The hydraulic motor to be tested is placed on the horizontal cross plate (23) of the motor clamping assembly (2), and then the operator rotates the adjusting threaded rod (24) to drive the clamping plate (22) to centrally clamp the hydraulic motor on the horizontal cross plate (23) to ensure the stability of the hydraulic motor; S2, preliminary positioning: After the hydraulic motor is fixed, the operator pushes the movable plate (80) toward the hydraulic motor, so that the entire positioning sleeve (53) moves toward the output shaft of the hydraulic motor, until the positioning sleeve (53) is completely sleeved on the output shaft of the hydraulic motor, and the preliminary positioning of the output shaft of the hydraulic motor and the positioning sleeve (53) is completed; S3, precise positioning: when the operator pushes the movable plate (80) toward the direction of the hydraulic motor, the output shaft of the hydraulic motor, under the action of the guide strip (60) in the positioning sleeve (53), finely adjusts the position of the positioning sleeve (53), so that the positioning needle (66) inside it abuts against the central axis of the output shaft of the hydraulic motor. Then, the positioning needle (66) is squeezed by the output shaft of the hydraulic motor, so that the positioning needle (66) is compressed. During this process, the clamping rod (70) clamps and fixes the output shaft of the hydraulic motor entering the positioning sleeve (53). At this time, the output shaft of the hydraulic motor and the positioning sleeve (53) are fixed, and both are on the same central axis. S4, torque test: After the output shaft of the hydraulic motor is positioned with the positioning sleeve (53), the operator starts the hydraulic motor to test its torque.

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