Test fixture for testing shear force of magnetic steel
By designing a test fixture that includes a base, a connecting plate, a screw, and a force gauge, the problem of accurately measuring the shear force of magnets in existing technologies has been solved, and rapid and accurate testing of the shear force of magnets has been achieved.
Patent Information
- Application Number
- CN202521833172.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-27
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-08-27
AI Technical Summary
Existing technologies lack effective testing equipment, making it difficult to accurately measure the shear force required for the magnet to move on the yoke, and manual measurement is greatly affected by external factors.
A testing fixture was designed, including a base, a connecting plate, a screw, a force gauge, and a push plate. The force gauge is driven by the screw to move downward and contact the push plate, which pushes the magnet and the shear force is detected by the force gauge.
This technology enables rapid and accurate testing of the shear force of magnets on the yoke, improving the accuracy and stability of the test.
Smart Images
Figure CN224681712U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of motor equipment technology, specifically relating to a testing fixture for testing the shear force of magnets. Background Technology
[0002] In a motor rotor composed of a yoke and magnets, the shear force of the magnets refers to the force required to move the magnets on the yoke. It affects the stable operation of the motor, but there is a lack of testing equipment that can effectively measure the shear force of the magnets. Manual measurement is greatly affected by external factors and it is difficult to obtain accurate data.
[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content
[0004] The purpose of this invention is to provide a testing fixture that can quickly and effectively test the shear force of a magnet fixed on a magnetic yoke.
[0005] To achieve the above objectives, a specific embodiment of this utility model provides a testing fixture for testing the shear force of a magnet, comprising a base, a connecting plate, and a testing assembly. A fixing column is provided on the base. The connecting plate is used to fix a magnetic yoke and is fixed to the fixing column along with the yoke. The testing assembly includes a screw, a force gauge, a push plate, and a fixing plate. The fixing plate is connected to the connecting plate. The push plate abuts against the magnet. The force gauge is mounted on the fixing plate and located above the push plate. The screw is mounted on the fixing plate and positioned above the force gauge, connecting to and driving the force gauge downwards to contact the push plate, thereby driving the push plate to push the magnet.
[0006] In one or more embodiments of the present invention, the testing assembly further includes a mounting bracket fixed to the fixing plate, the force gauge is disposed within the mounting bracket, and the screw is fixed above the mounting bracket and extends into the mounting bracket.
[0007] In one or more embodiments of the present invention, the connecting plate includes a main plate and a cylindrical first protrusion protruding from one side of the main plate, the fixing plate includes an annular plate sleeved on the first protrusion and a mounting block protruding from the annular plate, and the mounting bracket is fixed on the mounting block.
[0008] In one or more embodiments of the present invention, a pressure plate fixed to the first protrusion is further included, and the annular plate is clamped between the main body plate and the pressure plate.
[0009] In one or more embodiments of this utility model, the height of the first protrusion is less than the thickness of the annular plate, and the annular plate is pressed between the main body plate and the pressure plate.
[0010] In one or more embodiments of the present invention, the test assembly further includes a limiting plate fixed to the mounting block, the limiting plate having two opposing protrusions extending outwards, a channel being formed between the two protrusions parallel to the direction of movement of the push-away magnet, and the push plate being clamped between the two protrusions.
[0011] In one or more embodiments of this utility model, the limiting plate is provided with a through strip-shaped limiting groove that extends along the moving direction of the magnet, and the push plate is provided with a positioning hole. When the push plate is located between two protrusions, the positioning hole is coaxial with the limiting groove.
[0012] In one or more embodiments of the present invention, the push plate includes a rectangular main body and an abutting block protruding from one end of the main body. The main body is attached to the surface of the magnet, the abutting block abuts against the upper end of the magnet, and a positioning hole is formed on the main body.
[0013] In one or more embodiments of this utility model, the fixing column is detachably fixed to the base and the connecting plate, and / or the connecting plate and the pressure plate are detachably fixed, and / or the mounting bracket and the limiting plate are detachably fixed to the mounting block.
[0014] In one or more embodiments of the present invention, the connecting plate includes a second protrusion protruding from the other side of the main body plate and a third protrusion protruding from the surface of the second protrusion. The top of the fixing column is provided with a groove for accommodating the third protrusion. The second protrusion is supported on the top surface of the fixing column. The surface of the main body plate surrounding the second protrusion is used to fix the magnetic yoke to be tested.
[0015] Compared with the prior art, the test fixture of this utility model has a simple structure and can quickly and accurately test the shear force of the magnet attached to the magnetic yoke. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the test fixture in one embodiment of the present invention;
[0018] Figure 2 This is a disassembled view of the test fixture in one embodiment of the present invention;
[0019] Figure 3 This is a schematic diagram of the connecting plate in one embodiment of the present utility model;
[0020] Figure 4 This is a schematic diagram of the other side of the connecting plate in one embodiment of the present invention;
[0021] Figure 5 This is a schematic diagram of the fixing plate in one embodiment of the present utility model;
[0022] Figure 6 This is a schematic diagram of the limiting plate in one embodiment of the present invention;
[0023] Figure 7 This is a schematic diagram of the push plate in one embodiment of the present invention.
[0024] Explanation of key figure labels:
[0025] 100-Test fixture, 10-Base, 11-Fixing column, 12-Groove, 20-Connecting plate, 21-Main body plate, 22-First protrusion, 23-Second protrusion, 24-Third protrusion, 30-Test component, 31-Screw, 32-Force gauge, 33-Push plate, 331-Positioning hole, 332-Main body, 333-Abutting block, 34-Fixing plate, 341-Annular plate, 342-Mounting block, 35-Mounting bracket, 351-Side plate, 352-Top plate, 36-Limiting plate, 361-Protrusion, 362-Limiting groove, 40-Pressure plate, 51-Magnetic yoke, 52-Magnet. Detailed Implementation
[0026] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.
[0027] like Figure 1-7As shown, the test fixture 100 in one embodiment of this utility model is used to test the shear force of the magnet 52 attached to the magnetic yoke 51 in the motor rotor. The test fixture 100 includes a base 10, a connecting plate 20, and a test assembly 30. A fixing post 11 is provided on the base 10. The connecting plate 20 is used to fix to the end of the magnetic yoke 51 and then to the fixing post 11. The test assembly 30 includes a screw 31, a force gauge 32, a push plate 33, and a fixing plate 34. The fixing plate 34 is connected to the connecting plate 20. The push plate 33 is used to abut against the upper end face of the magnet 52. The force gauge 32 and the screw 31 are both mounted on the fixing plate 34. The force gauge 32 is located above the push plate 33. The screw 31 is located above the force gauge 32 and can connect to and drive the force gauge 32 to move down and contact the push plate 33, thereby driving the push plate 33 to push the magnet 52.
[0028] The test fixture 100 in this embodiment is used to test the shear force of the magnet 52, that is, to test the force required to move the magnet 52. During operation, the magnetic yoke 51 is first fixed to the connecting plate 20, and then the connecting plate 20 with the magnetic yoke 51 fixed is installed onto the fixing column 11, with the magnetic yoke 51 sleeved outside the fixing column 11. The fixing plate 34 is connected to the connecting plate 20, and the push plate 33 is placed on one of the magnets 52 to be tested. The screw 31 is operated to cause the force gauge 32 to descend and abut against the push plate 33. Then, the screw 31 is operated to cause the force gauge 32 to push the push plate 33 downward, applying a force to the magnet 52 until the magnet 52 moves. The force gauge 32 detects the force during the process, thereby obtaining the shear force data of the magnet 52. This test fixture 100 has a simple structure and can quickly detect the shear force of the magnet 52.
[0029] Preferably, the test assembly 30 further includes a mounting bracket 35 fixed to the mounting plate 34, a force gauge 32 disposed within the mounting bracket 35, and a screw 31 fixed above the mounting bracket 35 and extending into the mounting bracket 35.
[0030] The connecting plate 20 includes a main plate 21 and a cylindrical first protrusion 22 protruding from the upper surface of the main plate 21. The fixing plate 34 includes an annular plate 341 sleeved on the first protrusion 22 and a mounting block 342 protruding from the annular plate 341. The mounting frame 35 is fixed to the mounting block 342. The mounting frame 35 has an inverted U-shaped structure, including two side plates 351 and a top plate 352, which cooperate with the mounting block 342 to form a rectangular frame. Holes are opened on the mounting block 342 and the top plate 352 respectively. The force gauge 32 is set between the mounting block 342 and the top plate 352. The push plate 33 is located below the opening of the mounting block 342. The screw 31 is fixed on the top plate 352 and pushes the force gauge 32 downward through the opening of the top plate 352. The force gauge 32 abuts against and pushes the push plate 33 downward through the opening of the mounting block 342, thereby applying a force to the magnet 52.
[0031] The annular plate 341 can rotate around its own axis, so the mounting bracket 35 can quickly rotate to the position of the next magnet to be tested after the test of a certain magnet 52 is completed, which is highly flexible.
[0032] In one embodiment, a pressure plate 40 is provided above the first protrusion 22 and is fixed to the first protrusion 22. Therefore, the annular plate 341 is clamped between the pressure plate 40 and the main plate 21, thereby improving the stability during the test and preventing the force measuring instrument 32 from shaking.
[0033] Furthermore, the height of the first protrusion 22 is set to be less than the thickness of the annular plate 341, thus creating a gap between the pressure plate 40 and the first protrusion 22. The pressure plate 40 actually contacts the annular plate 341, causing the annular plate 341 to be pressed between the pressure plate 40 and the main plate 21. This arrangement further improves the stability of the testing process, preventing the annular plate 341 from wobbling vertically or rotating horizontally, thereby ensuring testing accuracy.
[0034] Preferably, the test assembly 30 further includes a limiting plate 36 fixed to the mounting block 342. Two opposing protrusions 361 protrude from the limiting plate 36, forming a channel between the two protrusions 361 parallel to the direction of movement of the pushing magnet 52. The width of this channel is the same as the width of the push plate 33, and the push plate 33 is clamped between the two protrusions 361. The limiting plate 36 restricts the direction of movement of the push plate 33, preventing horizontal displacement and thus ensuring test accuracy.
[0035] Furthermore, a through-type strip-shaped limiting groove 362 is provided on the limiting plate 36, and the extending direction of the limiting groove 362 is also parallel to the moving direction of the pushing magnet 52. Correspondingly, a positioning hole 331 is provided on the push plate 33. When the push plate 33 is located between the two protrusions 361, the positioning hole 331 is coaxial with the limiting groove 362. The push plate 33 can be fixed on the limiting plate 36 with bolts, and the two will not separate without removing the bolts. At the same time, the limiting groove 362 further improves the stability of the push plate 33 when it moves.
[0036] In one embodiment, the push plate 33 includes a rectangular main body 332 and an abutment block 333 protruding from one end of the main body 332, with a positioning hole 331 formed on the main body 332. During testing, the main body 332 is used to fit against the surface of the magnet 52, while the abutment block 333 abuts against the upper end face of the magnet 52, and a force is applied to the magnet 52 by the abutment block 333.
[0037] Preferably, the connecting plate 20 further includes a second protrusion 23 protruding from the lower surface of the main body plate 21, and a third protrusion 24 protruding from the surface of the second protrusion 23. The top of the fixing post 11 is provided with a groove 12 for accommodating the third protrusion 24. When fixed, the third protrusion 24 is embedded in the groove 12, while the second protrusion 23 is supported on the top surface of the fixing post 11. The surface of the main body plate 21 surrounding the second protrusion 23 is used to fix the magnetic yoke 51 to be tested.
[0038] Preferably, the fixing column 11 is detachably fixed to the base 10 and the connecting plate 20 respectively, the connecting plate 20 is detachably fixed to the pressure plate 40, and the mounting bracket 34 and the limiting plate 36 are detachably fixed to the mounting block 342 respectively. Therefore, when changing the magnetic yoke 51 of different specifications, the fixing column 11 of the corresponding specifications and the test component 30 can be replaced for adaptation, further improving flexibility.
[0039] For example, multiple mounting holes can be made on the pressure plate 40, connecting plate 20, fixing column 11 and base 10 respectively, and fixed by bolts. When disassembly and replacement are required, the bolts can be removed.
[0040] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A testing fixture for testing the shear force of a magnet, characterized in that, include: A base, on which a fixing post is provided; A connecting plate is used to fix the magnetic yoke and, together with the magnetic yoke, to the fixing post; The test assembly includes a screw, a force gauge, a push plate, and a fixed plate. The fixed plate is connected to the connecting plate. The push plate is used to abut against the magnet. The force gauge is mounted on the fixed plate and located above the push plate. The screw is mounted on the fixed plate and positioned above the force gauge. It connects to and drives the force gauge to move downward and contact the push plate, thereby driving the push plate to push the magnet.
2. The test fixture according to claim 1, characterized in that, The test assembly also includes a mounting bracket fixed to the mounting plate, the force gauge is disposed within the mounting bracket, and the screw is fixed above the mounting bracket and extends into the mounting bracket.
3. The testing fixture according to claim 2, characterized in that, The connecting plate includes a main plate and a cylindrical first protrusion protruding from one side of the main plate. The fixing plate includes an annular plate sleeved on the first protrusion and a mounting block protruding from the annular plate. The mounting bracket is fixed on the mounting block.
4. The testing fixture according to claim 3, characterized in that, It also includes a pressure plate fixed to the first protrusion, and the annular plate is clamped between the main body plate and the pressure plate.
5. The testing fixture according to claim 4, characterized in that, The height of the first protrusion is less than the thickness of the annular plate, which is pressed between the main plate and the pressure plate.
6. The test fixture according to claim 3, characterized in that, The test assembly also includes a limiting plate fixed to the mounting block, on which two opposing protrusions protrude, forming a channel between the two protrusions parallel to the direction of movement of the push-away magnet, and the push plate is clamped between the two protrusions.
7. The test fixture according to claim 6, characterized in that, The limiting plate is provided with a through strip-shaped limiting groove that extends along the moving direction of the magnet. The push plate is provided with a positioning hole. When the push plate is located between two protrusions, the positioning hole is coaxial with the limiting groove.
8. The test fixture according to claim 7, characterized in that, The push plate includes a rectangular main body and an abutting block protruding from one end of the main body. The main body is attached to the surface of the magnet, and the abutting block abuts against the upper end of the magnet. The corresponding positioning hole is opened on the corresponding main body.
9. The test fixture according to claim 6, characterized in that, The fixing columns are detachably fixed to the base and the connecting plate, and / or The connecting plate and pressure plate are detachably fixed, and / or The mounting bracket and the limiting plate are detachably fixed to the mounting block.
10. The test fixture according to claim 3, characterized in that, The connecting plate includes a second protrusion protruding from the other side of the main plate and a third protrusion protruding from the surface of the second protrusion. The top of the fixing column is provided with a groove to accommodate the third protrusion. The second protrusion is supported on the top surface of the fixing column. The surface of the main plate surrounding the second protrusion is used to fix the magnetic yoke to be tested.