Motor shaft strength test fixture

Abstract

This utility model discloses a motor shaft strength testing fixture, comprising: a base plate, which can be mounted on a testing machine; and a clamping assembly, having two sets respectively disposed at both ends of the top of the base plate, one set being fixed to the base plate and the other set capable of reciprocating along the length of the base plate; the clamping assembly includes four clamping blocks evenly distributed around the circumference of the motor shaft, the clamping blocks being capable of synchronously moving closer to or further away from the motor shaft; the clamping assembly also includes a support frame disposed on the clamping blocks, the support frame having a clamping wheel rotatably disposed thereon capable of contacting the surface of the motor shaft to apply clamping force to the motor shaft. By setting the clamping wheel to contact the surface of the motor shaft, when testing other positions of the motor shaft, the position can be adjusted simply by rotating the motor shaft, without the need to reposition the motor shaft.

Description

Technical Field

[0001] This utility model relates to the technical field of testing equipment for shaft workpiece processing, specifically a motor shaft strength testing fixture. Background Technology

[0002] As an indispensable power device in modern industry and daily life, the stability and reliability of electric motor performance are of paramount importance. The motor shaft, as one of the core components of the motor, bears the critical tasks of transmitting torque, supporting the rotor, and withstanding various complex loads. During motor operation, the motor shaft needs to withstand multiple forces, including internal electromagnetic forces, external loads, and its own rotational inertia, placing it under complex stress. Therefore, the strength of the motor shaft directly affects the motor's service life, operating efficiency, and safety. Insufficient strength in the motor shaft can lead to fractures, deformation, and other malfunctions during operation, resulting in motor damage. Motor shaft strength testing includes checking for internal cracks or surface cracks within the shaft.

[0003] Chinese utility model patent (authorization announcement number CN220019180U) discloses a motor shaft strength testing fixture, including a base and a support plate fixedly mounted on the top of the base. A damping shaft is fixedly mounted inside the support plate, and a damping sleeve is rotatably sleeved on the outer side of the damping shaft. Two symmetrically arranged mounting seats are fixedly mounted on the outer side wall of the damping sleeve. A positioning frame is fixedly passed through the upper end of the side wall of the mounting seat. A clamping mechanism for fixing the motor shaft is provided inside the positioning frame. A fixing plate is fixedly mounted on the upper outer side of the mounting seat. A connecting plate is fixedly mounted inside the positioning frame. A crossbar is rotatably passed through the connecting plate. A drive locking and loosening mechanism is provided between the crossbar and the fixing plate.

[0004] The aforementioned prior art discloses a motor shaft strength testing fixture that uses a lead screw drive to clamp and fix the motor shaft. Specifically, the rotation of the lead screw drives the clamping block to reciprocate, thereby tightly clamping the motor shaft for subsequent strength testing. While this fixture can meet basic clamping requirements to a certain extent, it reveals numerous problems in practical applications, especially when testing different positions of the motor shaft, making operation extremely inconvenient. When strength testing is required at other positions of the motor shaft, the existing fixture requires first loosening the motor shaft, then readjusting its position to accurately align the part to be tested with the testing head, and finally clamping the motor shaft again for testing. This repetitive positioning process involves multiple steps, requiring operators to repeatedly loosen, adjust, and clamp the fixture, which is time-consuming and labor-intensive. Utility Model Content

[0005] The purpose of this utility model application is to provide a motor shaft strength testing fixture. By setting clamping wheels to contact the surface of the motor shaft, when testing other positions of the motor shaft, the position can be adjusted simply by rotating the motor shaft, without the need to reposition the motor shaft.

[0006] To address the problems in the prior art, this utility model application provides a motor shaft strength testing fixture, comprising: a base plate, which can be mounted on a testing machine; and a clamping assembly, having two sets respectively disposed at both ends of the top of the base plate, wherein one set is fixed to the base plate and the other set of clamping assemblies can reciprocate along the length of the base plate; the clamping assembly includes four clamping blocks evenly distributed around the circumference of the motor shaft, the clamping blocks being able to synchronously move closer to or further away from the motor shaft; the clamping assembly also includes a support frame disposed on the clamping blocks, the support frame having a clamping wheel rotatably disposed thereon, capable of contacting the surface of the motor shaft to apply clamping force to the motor shaft; and a pressure sensor for detecting the magnitude of the clamping force is also disposed between the support frame and the clamping blocks.

[0007] Preferably, the clamping assembly further includes a slider disposed on the clamping block, and the clamping assembly further includes a guide rail capable of slidingly engaging with the clamping block.

[0008] Preferably, the clamping assembly further includes a fixing plate disposed on the top of the base plate, and a support plate is fixed to one side of the fixing plate, with the guide rail fixed to the surface of the support plate.

[0009] Preferably, the clamping assembly further includes a drive mechanism disposed on the fixed plate and capable of driving the clamping block to synchronously move closer to or away from the motor shaft.

[0010] Preferably, the driving mechanism includes a telescopic driving component fixed at the center of the fixed plate. The output end of the telescopic driving component is connected to a movable block that can reciprocate. A connecting rod is rotatably mounted on the movable block via a shaft, and the other end of the connecting rod is movably connected to the slider via a shaft. The position of the connecting rod near the slider is also movably connected to the guide rail via a shaft.

[0011] Preferably, the clamping wheel is a rubber wheel.

[0012] Preferably, the bottom of the fixing plate in the clamping assembly that reciprocates on the base plate is fixed with a guide block, and the top of the base plate is also provided with a sliding groove along its length, and the sliding groove is slidably engaged with the guide block.

[0013] Preferably, the clamping assembly that reciprocates on the base plate is further provided with clamps on both sides of the fixing plate, which can fix the clamping assembly to the base plate.

[0014] The advantages of this utility model compared to the prior art are:

[0015] This application designs a clamping device for motor shaft inspection, the core of which lies in the use of clamping wheels to effectively clamp the motor shaft. These clamping wheels possess synchronous movement characteristics; under the action of the drive mechanism, multiple clamping wheels can move synchronously towards the motor shaft until they make tight contact with the motor shaft surface. When other positions of the motor shaft need to be inspected, the position of the motor shaft can be easily adjusted simply by rotating the motor shaft, eliminating the need for tedious repositioning operations and greatly improving inspection efficiency. The clamping wheels are made of rubber, which has good elasticity and friction properties, effectively preventing marks from appearing on the clamping position of the motor shaft during clamping, ensuring the appearance quality of the motor shaft. Furthermore, a pressure sensor is installed between the clamping block and the support frame. The pressure sensor can monitor the pressure applied to the motor shaft in real time during clamping, preventing damage to the motor shaft due to excessive pressure. Simultaneously, the drive mechanism adopts a synchronous clamping design, ensuring that multiple clamping wheels center and clamp the motor shaft, guaranteeing the stability and accuracy of the motor shaft during inspection, and providing a reliable guarantee for motor shaft inspection. Attached Figure Description

[0016] Figure 1 This is a first three-dimensional structural diagram of a motor shaft strength testing fixture according to this utility model application.

[0017] Figure 2 This is a schematic diagram of the second three-dimensional structure of a motor shaft strength testing fixture according to this utility model application.

[0018] Figure 3 This is a first three-dimensional structural diagram of the clamping assembly of a motor shaft strength testing fixture according to this utility model application.

[0019] Figure 4 This is a schematic diagram of the second three-dimensional structure of the clamping component of a motor shaft strength testing fixture according to this utility model application.

[0020] Figure 5 This is a schematic diagram of the third three-dimensional structure of the clamping component of a motor shaft strength testing fixture according to this utility model application.

[0021] Figure 6 This is a schematic diagram of the fourth three-dimensional structure of the clamping component of a motor shaft strength testing fixture according to this utility model application.

[0022] The following are the labels in the diagram: 1. Base plate; 11. Slide groove; 2. Clamping assembly; 21. Fixing plate; 22. Support plate; 23. Guide rail; 24. Clamping block; 241. Slider; 25. Support frame; 26. Clamping wheel; 27. Drive mechanism; 271. Telescopic drive component; 272. Moving block; 273. Connecting rod; 3. Clamping clamp; 4. Guide block. Detailed Implementation

[0023] To further understand the features, technical means, and specific objectives and functions achieved by this utility model application, the following detailed description of this utility model application is provided in conjunction with the accompanying drawings and specific embodiments.

[0024] Reference Figures 1-6 As shown, this utility model application provides a motor shaft strength testing fixture, including: a base plate 1, which can be installed on a testing machine; a clamping assembly 2, having two sets respectively disposed at both ends of the top of the base plate 1, one set being fixed on the base plate 1, and the other set of clamping assemblies 2 being able to reciprocate along the length direction of the base plate 1; the clamping assembly 2 includes four clamping blocks 24 evenly distributed around the circumference of the motor shaft, the clamping blocks 24 being able to synchronously approach or move away from the motor shaft, the clamping assembly 2 also includes a support frame 25 disposed on the clamping blocks 24, the support frame 25 being rotatably disposed with clamping wheels 26 that can contact the surface of the motor shaft and apply clamping force to the motor shaft, and a pressure sensor for detecting the magnitude of the clamping force is also disposed between the support frame 25 and the clamping blocks 24.

[0025] When a strength test is required on the motor shaft, the base plate 1 is first installed on the testing machine to ensure the overall fixture is fixed and stable. Based on the length of the motor shaft to be tested, the position of the movable clamping assembly 2 along the length of the base plate 1 is adjusted so that the distance between the two sets of clamping assemblies 2 adapts to the length of the motor shaft. The motor shaft is placed between the two sets of clamping assemblies 2, so that the four clamping blocks 24 in each set of clamping assemblies 2 move synchronously towards the motor shaft. As the clamping blocks 24 move, the clamping wheels 26 on the support frame 25 contact the surface of the motor shaft and gradually apply clamping force. During this process, the pressure sensor between the support frame 25 and the clamping blocks 24 monitors the magnitude of the clamping force in real time and feeds the signal back to the control system (the control system is the control system of the testing device, which is existing technology and not shown in the figure). When the clamping force reaches a preset suitable value, the clamping blocks 24 stop moving, and the motor shaft is stably clamped between the two sets of clamping assemblies 2. During the motor shaft strength test, if the motor shaft needs to rotate, the clamping wheels 26 can roll along with the rotation of the motor shaft to ensure clamping stability.

[0026] The clamping assembly 2 also includes a slider 241 disposed on the clamping block 24, and a guide rail 23 that can slide and engage with the clamping block 24. The function of the slider 241 is to guide the clamping block 24 to move linearly along the guide rail 23, ensuring the stability and accuracy of the clamping block 24 during movement, so that the clamping block 24 can move closer to or away from the motor shaft according to a predetermined trajectory.

[0027] The clamping assembly 2 also includes a fixing plate 21 disposed on the top of the base plate 1, and a support plate 22 is fixed on one side of the fixing plate 21, and the guide rail 23 is fixed on the surface of the support plate 22.

[0028] The clamping assembly 2 also includes a drive mechanism 27 mounted on the fixed plate 21 and capable of driving the clamping block 24 to move synchronously closer to or further away from the motor shaft. The drive mechanism 27 includes a telescopic drive member 271 fixed at the center of the fixed plate 21. The output end of the telescopic drive member 271 is connected to a reciprocating moving block 272. A connecting rod 273 is rotatably mounted on the moving block 272 via a shaft, and the other end of the connecting rod 273 is movably connected to the slider 241 via a shaft. The position of the connecting rod 273 near the slider 241 is also movably connected to the guide rail 23 via a shaft. The clamping wheel 26 is a rubber wheel.

[0029] The output end of the telescopic drive component 271 drives the moving block 272 to reciprocate. The movement of the moving block 272 causes the connected link 273 to rotate and move. Since one end of the link 273 is rotatably connected to the moving block 272 and the other end is movably connected to the slider 241, and is movably connected to the guide rail 23 near the slider 241, the movement of the link 273 is converted into the linear movement of the slider 241 along the guide rail 23. The slider 241 drives the clamping block 24 to move synchronously towards the motor shaft along the guide rail 23. The clamping wheel 26, which is set on the support frame 25, contacts the surface of the motor shaft and gradually applies a clamping force to the motor shaft.

[0030] A guide block 4 is fixed to the bottom of the fixing plate 21 of the clamping assembly 2 that reciprocates on the base plate 1. A sliding groove 11 is also provided on the top of the base plate 1 along its length direction, and the sliding groove 11 slides in cooperation with the guide block 4. The two sides of the fixing plate 21 of the clamping assembly 2 that reciprocates on the base plate 1 are also provided with clamps 3 that can fix the clamping assembly 2 on the base plate 1.

[0031] The above embodiments only illustrate one or more implementation methods of this utility model application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model application, and these all fall within the protection scope of this utility model application. Therefore, the protection scope of this utility model application should be determined by the appended claims.

Claims

1. A motor shaft strength testing fixture, characterized in that: include: The base plate (1) can be installed on the testing machine; The clamping assembly (2) has two sets and is respectively set at both ends of the top of the base plate (1), and one set is fixed on the base plate (1), while the other set of clamping assemblies (2) can reciprocate along the length of the base plate (1); The clamping assembly (2) includes four clamping blocks (24) evenly distributed around the circumference of the motor shaft. The clamping blocks (24) can move closer to or further away from the motor shaft synchronously. The clamping assembly (2) also includes a support frame (25) disposed on the clamping blocks (24). The support frame (25) is rotatably provided with clamping wheels (26) that can contact the surface of the motor shaft and apply clamping force to the motor shaft. A pressure sensor for detecting the magnitude of the clamping force is also disposed between the support frame (25) and the clamping blocks (24).

2. The motor shaft strength testing fixture according to claim 1, characterized in that: The clamping assembly (2) further includes a slider (241) disposed on the clamping block (24), and the clamping assembly (2) further includes a guide rail (23) capable of slidingly engaging with the clamping block (24).

3. The motor shaft strength testing fixture according to claim 2, characterized in that: The clamping assembly (2) also includes a fixing plate (21) disposed on the top of the base plate (1), and a support plate (22) is fixed on one side of the fixing plate (21), and the guide rail (23) is fixed on the surface of the support plate (22).

4. The motor shaft strength testing fixture according to claim 3, characterized in that: The clamping assembly (2) also includes a drive mechanism (27) disposed on the fixed plate (21) and capable of driving the clamping block (24) to move synchronously closer to or away from the motor shaft.

5. A motor shaft strength testing fixture according to claim 4, characterized in that: The drive mechanism (27) includes a telescopic drive member (271) fixed at the center of the fixed plate (21). The output end of the telescopic drive member (271) is connected to a moving block (272) that can reciprocate. A connecting rod (273) is rotatably mounted on the moving block (272) via a shaft. The other end of the connecting rod (273) is movably connected to the slider (241) via a shaft. The position of the connecting rod (273) near the slider (241) is also movably connected to the guide rail (23) via a shaft.

6. A motor shaft strength testing fixture according to claim 1, characterized in that: The clamping wheel (26) is a rubber wheel.

7. A motor shaft strength testing fixture according to claim 1, characterized in that: A guide block (4) is fixed at the bottom of the fixing plate (21) in the clamping assembly (2) that moves back and forth on the base plate (1). A groove (11) is also provided on the top of the base plate (1) along its length direction, and the groove (11) slides in cooperation with the guide block (4).

8. A motor shaft strength testing fixture according to claim 7, characterized in that: The clamping assembly (2) that reciprocates on the base plate (1) is provided with clamps (3) on both sides of the fixing plate (21) that can fix the clamping assembly (2) on the base plate (1).

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