Grinding clamp for preparing permanent magnetic ferrite test sample

Abstract

The utility model discloses a grinding fixture for preparing a permanent magnetic ferrite test sample, which comprises a grinding machine working table, a sample clamping device and a pushing device, the sample clamping device is fixed on the pushing device, the pushing device is fixed on the grinding machine working table, and the grinding machine working table is fixed on the grinding machine working table. The device is characterized in that the sample clamping device comprises a clamping cylinder, a sample chuck and a clamping seat, clamping grooves are symmetrically formed in the two sides of the end of the clamping cylinder, insections are symmetrically arranged on the inner walls of the two clamping grooves, and the clamping seat penetrates through the clamping grooves in the two sides to be locked on the clamping cylinder. And the end part of the clamping cylinder is divided into an upper end part and a lower end part by the clamping groove. According to the utility model, the permanent magnetic ferrite test sample with two parallel end faces can be obtained through the matching of the sample clamping device and the pushing device, the universality is very high, and the test sample is doubly clamped by the clamping pieces on the sample clamping device and the pushing device, so that the test sample is firm and reliable, and the operation safety is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of permanent magnet ferrite sample preparation technology, and specifically relates to a grinding fixture for preparing permanent magnet ferrite test samples. Background Technology

[0002] Currently, permanent magnet ferrites need to be tested by preparing permanent magnet ferrite test samples before use.

[0003] According to the national standard GB / T 3217-2013 "Magnetic Test Methods for Permanent Magnet (Hard Magnetic) Materials": The standard specimen for performance testing should be a cylindrical shape with a circular (or rectangular) cross-section. To ensure uniform magnetization, the specimen length should be greater than 5 mm. Both end faces of the specimen should be ground until they are parallel to each other, with a parallelism not exceeding 9th grade of geometric tolerance. The end faces should be perpendicular to the axis, with a perpendicularity not exceeding 9th grade of geometric tolerance. The surface roughness parameter Ra value should not exceed 3.2 μm to reduce air gaps. Especially for circular cross-section specimens, due to the shrinkage of the pressed ferrite blank during sintering and the indentation of the filter cloth on its upper end face, the roughness of the upper and lower end faces of the cylindrical sample may not meet the standards and they may not be parallel. Therefore, the upper and lower surfaces of the sample must be ground before performance testing can be performed.

[0004] To achieve the requirement of parallelism at both ends of the sample, surface grinders are generally used, which is costly. However, ordinary grinding wheels are difficult to use to meet national standards. Therefore, to make the method of grinding standard samples more universal and enable ordinary grinding wheels to grind standard samples, this invention proposes a grinding fixture for preparing permanent magnet ferrite test samples. Utility Model Content

[0005] 1. Technical problem to be solved by the utility model

[0006] The purpose of this invention is to overcome the problems of ordinary grinding machines being unable to clamp permanent magnet ferrite test samples and being unable to grind standard permanent magnet ferrite test samples with parallel end faces, and to provide a grinding fixture for preparing permanent magnet ferrite test samples. This invention utilizes the cooperation of a sample clamping device and a pushing device to obtain permanent magnet ferrite test samples with parallel end faces, exhibiting high versatility. Furthermore, the test sample is double-clamped by the clamps on both the sample clamping device and the pushing device, ensuring a firm and reliable grip. This effectively avoids the need for grinding operators to manually clamp the test instrument during grinding, greatly improving operational safety. This invention is also resistant to humid environments during grinding and is easy to inspect, maintain, and service.

[0007] 2. Technical Solution

[0008] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0009] This utility model discloses a grinding fixture for preparing permanent magnet ferrite test samples, comprising a grinding wheel worktable, a sample clamping device, and a pushing device. The sample clamping device is fixed on the pushing device, and the pushing device is fixed on the grinding wheel worktable. The sample clamping device comprises a clamping cylinder, a sample chuck, and a clamping seat. The clamping cylinder has symmetrically formed clamping grooves on both sides of its end, and symmetrically formed teeth on the inner walls of the two clamping grooves. The clamping seat passes through the clamping grooves on both sides and is locked onto the clamping cylinder. The clamping grooves divide the end of the clamping cylinder into an upper end and a lower end, with the lower end being longer than the upper end. Symmetrically formed lower clamping plates are arranged on both sides of the lower end. The sample chuck includes two upper clamping plates and an arc-shaped clamping plate that respectively cooperate with the lower clamping plates. The upper and lower clamping plates are bolted together.

[0010] As a further improvement of this utility model, the clamping base is an integral design, which includes a fixing card, a connecting key, a fixing base, a fixing head and a fixing nut in sequence. The fixing card is connected to one side of the fixing base through the connecting key, and the other side of the fixing base is connected to the fixing head. The fixing head is provided with a fixing nut for locking the clamping base.

[0011] As a further improvement of this utility model, the pushing device includes a pushing frame body, a pushing screw, and a fixing fixture platform. The upper part of the pushing frame body is a hollow square pushing frame, and the fixing fixture platform is disposed inside the square pushing frame. The pushing screw passes through the side of the pushing frame body and pushes the fixing fixture platform to move within the square pushing frame.

[0012] As a further improvement of this utility model, the lower part of the push frame body is fixed to the grinding wheel worktable by no less than two fixing screws.

[0013] As a further improvement of this utility model, the fixed clamping table includes a square base and a base clamping piece disposed on the square base. The bottom of the square base is disposed on the grinding wheel worktable, and the two symmetrical sides of the square base are in close contact with the inner wall of the square push frame.

[0014] As a further improvement of this utility model, there are two base clamps, which are symmetrically arranged. Each base clamp includes a vertical clamp and a horizontal base plate that is perpendicularly connected to the vertical clamp. The horizontal base plate is fixed on the square base by clamping nuts. Clamping nuts are symmetrically arranged on the upper part of each vertical clamp.

[0015] As a further improvement of this utility model, the grinding wheel workbench includes an L-shaped workbench and a grinding wheel installed on the side of the L-shaped workbench. The vertical surface and the horizontal surface of the L-shaped workbench are connected at a right angle, and the pushing device is in close contact with the vertical surface and the horizontal surface of the L-shaped workbench.

[0016] As a further improvement of this utility model, a gasket is provided between the upper clamping plate and the lower clamping plate.

[0017] As a further improvement of this utility model, the clamping cylinder is a hollow cylinder.

[0018] 3. Beneficial effects

[0019] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0020] This invention utilizes a sample clamping device and a pushing device to obtain a permanent magnet ferrite test sample with parallel end faces, exhibiting high versatility. The test sample is double-clamped by the clamping plates on both the sample clamping and pushing devices, ensuring a secure and reliable hold. This effectively eliminates the need for manual clamping of the test instrument by the grinding operator during grinding, significantly improving operational safety. This invention is unaffected by humid environments during grinding, and is easy to inspect, maintain, and repair. Its reasonable structure eliminates the need for complex circuitry. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the grinding fixture for preparing permanent magnet ferrite test samples according to this utility model;

[0022] Figure 2 This is a schematic diagram of the sample clamping device of this utility model;

[0023] Figure 3 This is a right view of the clamping cylinder of this utility model;

[0024] Figure 4 This is a cross-sectional view of the clamping cylinder and sample clamp after assembly of this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the clamping base of this utility model;

[0026] Figure 6 This is a schematic diagram of the assembly cross-section of the clamping base and clamping cylinder of this utility model;

[0027] Figure 7 This is a schematic diagram of the base clamp of this utility model.

[0028] Reference numerals: 1-Grinding machine workbench 1; 2-Sample clamping device; 3-Pushing device; 11-L-shaped workbench; 12-Grinding machine; 21-Clamping cylinder; 22-Sample chuck; 23-Clamping seat; 231-Fixing card; 232-Connecting key; 233-Fixing base; 234-Fixing head; 235-Fixing nut; 24-Clamping groove; 25-Lower clamping piece; 221-Upper clamping piece; 222-Arc-shaped clamping piece; 31-Pushing frame body; 32-Pushing screw; 33-Fixing fixture table; 311-Fixing screw rod; 331-Square base; 332-Base clamping piece; 3321-Vertical clamping piece; 3322-Horizontal base piece; 3323-Clamping nut. Detailed Implementation

[0029] To further understand the content of this utility model, the technical solutions of this utility model will be clearly and completely described in conjunction with the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0030] Example 1

[0031] Figure 1-7 The diagram shows a schematic of a grinding fixture for preparing permanent magnet ferrite test samples according to this invention. The grinding fixture includes a grinding wheel worktable 1, a sample clamping device 2, and a pushing device 3. The sample clamping device 2 is fixed to the pushing device 3, and the pushing device 3 is fixed to the grinding wheel worktable 1. The sample clamping device 2 includes a clamping cylinder 21, a sample chuck 22, and a clamping seat 23. The clamping cylinder 21 has symmetrical openings on both sides of its end. A clamping groove 24 is provided, and symmetrical teeth are provided on the inner walls of the two clamping grooves 24. The clamping seat 23 passes through the clamping grooves 24 on both sides and is locked onto the clamping cylinder 21. The clamping groove 24 divides the end of the clamping cylinder 21 into an upper end and a lower end. The lower end is longer than the upper end. Lower clamping pieces 25 are symmetrically provided on both sides of the lower end. The sample clamp 22 includes two upper clamping pieces 221 and an arc-shaped clamping piece 222 that respectively cooperate with the lower clamping pieces 25. The upper clamping pieces 221 and the lower clamping pieces 25 are bolted together.

[0032] This embodiment utilizes the cooperation of a sample clamping device and a pushing device to obtain a permanent magnet ferrite test sample with parallel end faces, which has high versatility. The test sample is double-clamped by the clamping plates on the sample clamping device and the pushing device, which is firm and reliable. It effectively avoids the need for the grinding operator to manually clamp the tester for grinding, greatly improving the safety of operation. This utility model is not afraid of the humid environment during grinding, and is easy to inspect, maintain and repair. The structure is reasonable and does not require a complex circuit structure.

[0033] Example 2

[0034] like Figure 1-7 As shown, this embodiment is basically the same as embodiment 1. Preferably, the clamping seat 23 is an integral design, which includes a fixing card 231, a connecting key 232, a fixing base 233, a fixing head 234 and a fixing nut 235 in sequence. The fixing card 231 is connected to one side of the fixing base 233 through the connecting key 232. The other side of the fixing base 233 is connected to the fixing head 234. The fixing base 233 is a solid circular metal sheet that matches the size of the clamping cylinder 21. The fixing head 234 is externally provided with a fixing nut 235 for locking the clamping seat 23. In this embodiment, the fixing base 233 in the clamping seat 23 is a solid circular sheet, which can be used to hold samples of different sizes.

[0035] In a preferred embodiment, the pushing device 3 includes a pushing frame body 31, a pushing screw 32, and a fixing fixture platform 33. The upper part of the pushing frame body 31 is a hollow square pushing frame. The fixing fixture platform 33 is disposed inside the square pushing frame. The pushing screw 32 passes through the side of the pushing frame body 31 and pushes the fixing fixture platform 33 to move within the square pushing frame. In this embodiment, the pushing screw 32 and the fixing fixture platform 33 cooperate to push the test sample onto the grinding wheel, avoiding the dangers caused by manual clamping and grinding.

[0036] In a preferred embodiment, the lower part of the push frame body 31 is fixed to the grinding wheel worktable 1 by two fixing screws 311.

[0037] In a preferred embodiment, the fixed clamping table 33 includes a square base 331 and a base clamping piece 332 disposed on the square base 331. The bottom of the square base 331 is disposed on the grinding wheel worktable 1, and the two symmetrical sides of the square base 331 are in close contact with the inner wall of the square push frame.

[0038] In a preferred embodiment, there are two base clamping pieces 332, which are symmetrically arranged. Each base clamping piece 332 includes a vertical clamping piece 3321 and a horizontal base piece 3322 vertically connected to the vertical clamping piece 3321. The horizontal base piece 3322 is fixed to the square base 331 by clamping nuts 3323. Two clamping nuts 3323 are symmetrically arranged on the upper part of each vertical clamping piece 3321. In this embodiment, the clamping nuts 3323 located on the upper part of the vertical clamping piece 3321 are more conducive to locking the clamping cylinder.

[0039] In a preferred embodiment, the grinding wheel worktable 1 includes an L-shaped worktable 11 and a grinding wheel 12 installed on the side of the L-shaped worktable. The vertical surface and the horizontal surface of the L-shaped worktable 11 are connected at a right angle. The pushing device 3 is in close contact with the vertical surface and the horizontal surface of the L-shaped worktable 11, which can ensure the perpendicularity of the test sample after final grinding.

[0040] In a preferred embodiment, a gasket is provided between the upper clamping piece 221 and the lower clamping piece 25.

[0041] In a preferred embodiment, the clamping cylinder 21 is a hollow cylinder.

[0042] This embodiment utilizes the cooperation of a sample clamping device and a pushing device to obtain a permanent magnet ferrite test sample with parallel end faces, which has high versatility. The test sample is double-clamped by the clamping plates on the sample clamping device and the pushing device, which is firm and reliable. It effectively avoids the need for the grinding operator to manually clamp the tester for grinding, greatly improving the safety of operation. This utility model is not afraid of the humid environment during grinding, and is easy to inspect, maintain and repair. The structure is reasonable and does not require a complex circuit structure.

[0043] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A grinding fixture for preparing permanent magnet ferrite test samples, comprising a grinding wheel worktable, a sample clamping device, and a pushing device, wherein the sample clamping device is fixed on the pushing device, and the pushing device is fixed on the grinding wheel worktable, characterized in that: The sample clamping device includes a clamping cylinder, a sample clamping head, and a clamping base. The clamping cylinder has symmetrical clamping grooves on both sides of its end. The inner walls of the two clamping grooves are symmetrically provided with teeth. The clamping base passes through the clamping grooves on both sides and is locked onto the clamping cylinder. The clamping grooves divide the end of the clamping cylinder into an upper end and a lower end. The lower end is longer than the upper end. The lower end has symmetrically provided lower clamping pieces on both sides. The sample clamping head includes two upper clamping pieces and an arc-shaped clamping piece that respectively cooperate with the lower clamping pieces. The upper clamping pieces and the lower clamping pieces are bolted together.

2. The grinding fixture for preparing permanent magnet ferrite test samples according to claim 1, characterized in that: The clamping base is an integral design, comprising a fixing card, a connecting key, a fixing base, a fixing head, and a fixing nut in sequence. The fixing card is connected to one side of the fixing base via the connecting key, and the other side of the fixing base is connected to the fixing head. The fixing head is provided with a fixing nut on its exterior for locking the clamping base.

3. The grinding fixture for preparing permanent magnet ferrite test samples according to claim 2, characterized in that: The pushing device includes a pushing frame body, a pushing screw, and a fixing fixture platform. The upper part of the pushing frame body is a hollow square pushing frame. The fixing fixture platform is disposed inside the square pushing frame. The pushing screw passes through the side of the pushing frame body and pushes the fixing fixture platform to move within the square pushing frame.

4. The grinding fixture for preparing permanent magnet ferrite test samples according to claim 3, characterized in that: The lower part of the push frame body is fixed to the grinding wheel worktable by no less than two fixing screws.

5. A grinding fixture for preparing permanent magnet ferrite test samples according to claim 4, characterized in that: The fixed fixture table includes a square base and a base clamping piece disposed on the square base. The bottom of the square base is disposed on the grinding wheel worktable, and the two symmetrical sides of the square base are in close contact with the inner wall of the square push frame.

6. A grinding fixture for preparing permanent magnet ferrite test samples according to claim 5, characterized in that: The base clamps are two in number and are symmetrically arranged. Each base clamp includes a vertical clamp and a horizontal base plate that is perpendicularly connected to the vertical clamp. The horizontal base plate is fixed to the square base by clamping nuts. Clamping nuts are symmetrically arranged on the upper part of each vertical clamp.

7. A grinding fixture for preparing permanent magnet ferrite test samples according to claim 6, characterized in that: The grinding wheel workbench includes an L-shaped workbench and a grinding wheel installed on the side of the L-shaped workbench. The vertical surface and the horizontal surface of the L-shaped workbench are connected at a right angle. The pushing device is in close contact with the vertical surface and the horizontal surface of the L-shaped workbench.

8. A grinding fixture for preparing permanent magnet ferrite test samples according to claim 7, characterized in that: A gasket is provided between the upper clamp and the lower clamp.

9. A grinding fixture for preparing permanent magnet ferrite test samples according to claim 8, characterized in that: The clamping cylinder is a hollow cylinder.

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