A metallographic specimen clamp

Abstract

This utility model relates to the field of metallographic preparation technology, specifically to a metallographic sample fixture, including a base, a support platform for placing metallographic samples on the base, a housing between the support platform and the base, and a plurality of claws arranged in a circular array on the housing. The claws are rotatably connected to the housing, and the top of the claws has a protruding abutment portion. A push rod is slidably arranged on the housing, one end of the push rod abutting against the bottom of the claws. An adjustment component is provided inside the housing, the adjustment component including a turntable and a plurality of protrusions arranged in a circular array on the circumference of the turntable. The outer surface of the protrusions protrudes outward to form an arc-shaped surface, and the arc-shaped surface of the protrusions abuts against the other end of the push rod. The metallographic sample pre-fabrication fixture provided by this utility model has a simple structure and is easy to operate, which can solve the problems of difficult sample handling and uneven sample grinding during the metallographic sample polishing process.

Description

Technical Field

[0001] This utility model relates to the field of metallographic preparation technology, specifically to a metallographic sample holder. Background Technology

[0002] Metallographic analysis, as an important method for testing metallic materials, is mainly used to analyze the internal microstructure of metallic products. The selection and preparation of representative samples have a significant impact on the metallographic analysis results. According to the national standard "Methods for the Examination of Microstructures of Metals," metallographic testing requires steps such as sample mounting, rough grinding, fine grinding, polishing, and etching. After sample mounting, a metallographic specimen is prepared, which is then ground or polished. The polished metallographic specimen yields the surface to be analyzed.

[0003] In the polishing process of metallographic specimens, existing technologies often employ manual hand-held polishing on a polishing machine. However, this hand-held method is problematic, especially for small and thin specimens. The specimens are difficult to handle, requiring a high level of skill from the operator. Furthermore, uneven pressure during hand-held operation often results in the specimen surface not being parallel to the polishing disc, leading to an uneven metallographic surface that affects subsequent observation. Therefore, we propose a metallographic specimen fixture to address these issues. Summary of the Invention

[0004] To address the problems of manual polishing of metallographic samples on a polishing machine, which suffers from the difficulty of handling small samples and uneven metallographic surfaces, this invention proposes a metallographic sample clamp. This clamp allows for stable clamping of the metallographic sample simply by turning a knob, simplifying operation and reducing the demands on the operator. Furthermore, the design of the mounting platform and the jaw abutment ensures that the sample surface remains parallel to the polishing disc during polishing, resolving the issue of small samples being difficult to handle and preventing uneven metallographic surfaces caused by uneven pressure during handheld operation.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A metallographic sample holder includes a base, a support platform for placing metallographic samples on top of the base, and a housing between the support platform and the base. Several jaws are arranged in a circular array on the housing, and the jaws are rotatably connected to the housing. The top of each jaw has a protruding abutment. A push rod is slidably mounted on the housing, with one end abutting against the bottom of the jaws. An adjustment assembly is provided inside the housing, including a turntable and several protrusions arranged in a circular array on the circumference of the turntable. The outer surface of each protrusion protrudes outward to form an arc-shaped surface, which abuts against the other end of the push rod. When the push rod is pushed by the protrusions, it acts on the bottom of the jaws, causing the jaws to rotate on the housing. This allows the abutment portions at the top of the three jaws to clamp the metallographic sample from different directions.

[0007] Furthermore, the adjustment assembly also includes a rotating shaft fixedly mounted at the center of the turntable. The two ends of the rotating shaft are rotatably mounted on the housing and the base, respectively. A worm gear is fixedly mounted on the rotating shaft, located above the turntable. A worm is mounted on one side of the worm gear, with both ends rotatably mounted on the inner wall of the housing. The worm meshes with the worm gear. When the worm rotates, it drives the worm wheel to rotate. Since the worm wheel is fixed to the rotating shaft, and the rotating shaft is fixedly connected to the center of the turntable, the turntable begins to rotate.

[0008] Furthermore, several of the push rods are arranged in a circular array on the housing, with each push rod corresponding to a chuck.

[0009] Furthermore, a knob is fixedly installed at one end of the worm gear that passes through the housing. The operator rotates the knob, which drives the worm gear to rotate.

[0010] Furthermore, a bracket is provided on the housing, and a support shaft is provided in the middle of the chuck, with the support shaft rotatably mounted on the bracket. The support shaft in the middle of the chuck is rotatably mounted on the bracket of the housing, allowing the chuck to rotate around the support shaft as a fulcrum.

[0011] Furthermore, a spring is fixedly connected to the lower part of the claw, and the other end of the spring is fixedly connected to the housing.

[0012] The beneficial effects of this utility model through the above technical solution are as follows:

[0013] This utility model provides a metallographic sample clamp. The metallographic sample is placed on a support platform. The adjustment component rotates via a turntable, and the arc-shaped surface of the protrusion contacts the push rod. When the turntable rotates counterclockwise, the arc-shaped surface of the protrusion pushes the push rod to slide on the housing. After being pushed by the protrusion, the push rod acts on the bottom of the jaws, causing the jaws to rotate on the housing. In this way, the abutting parts at the top of the three jaws clamp the metallographic sample from different directions, ensuring stable clamping. During the above operation, only the knob needs to be turned to stably clamp the metallographic sample. The structure is simple, compact, and easy to operate, reducing the requirements for the operator. It solves the problem of the small size of the sample being difficult to handle when polishing metallographic samples manually by hand in the prior art. Furthermore, with the support of the support platform, the abutting parts at the top of the three jaws clamp the metallographic sample from different directions, ensuring stable clamping. The design of the cooperation between the support platform and the abutting parts of the jaws ensures that the surface of the metallographic sample remains parallel to the polishing disc during the polishing process, avoiding the problem of uneven metallographic surface caused by uneven pressure during hand operation. Attached Figure Description

[0014] Figure 1 This is a perspective view of a metallographic sample holder according to the present invention;

[0015] Figure 2 This is a front view of a metallographic sample holder according to the present invention;

[0016] Figure 3 This utility model relates to a metallographic sample holder. Figure 2 Sectional view at point AA;

[0017] Figure 4 This is a schematic diagram of the adjustment component in a metallographic sample holder according to the present invention;

[0018] Figure 5 This is a diagram showing the connection relationship between the jaws and the support in a metallographic sample fixture according to this utility model.

[0019] Figure 6 This is a schematic diagram illustrating the application state of a metallographic sample holder according to the present invention.

[0020] The numbers in the attached diagram are:

[0021] 1. Base; 2. Support platform; 3. Housing; 4. Claw; 5. Abutment part; 6. Push rod; 7. Turntable; 8. Protrusion; 9. Rotating shaft; 10. Worm gear; 11. Worm; 12. Arc surface; 13. Knob; 14. Bracket; 15. Support shaft; 16. Spring; 17. Metallographic sample. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0023] like Figures 1-6 As shown, this embodiment provides a metallographic sample fixture, including a base 1, a support platform 2 for placing a metallographic sample 17 is provided above the base 1, a housing 3 is provided between the support platform 2 and the base 1, three claws 4 are arranged in a circular array on the housing 3, the claws 4 are rotatably connected to the housing 3, and the top of the claws 4 is provided with an abutment part 5; a push rod 6 is slidably arranged on the housing 3, one end of the push rod 6 abuts against the bottom of the claws 4; an adjustment component is provided inside the housing 3, the adjustment component includes a turntable 7 and three protrusions 8 arranged in a circular array on the circumference of the turntable 7, the outer surface of the protrusions 8 protrudes outward to form an arc surface 12, the arc surface 12 abuts against the other end of the push rod 6.

[0024] This utility model provides a metallographic sample fixture in which the metallographic sample 17 is placed on the support platform 2. The adjustment component rotates via the turntable 7, and the arc-shaped surface 12 of the protrusion 8 contacts the push rod 6. When the turntable 7 rotates counterclockwise, the arc-shaped surface 12 of the protrusion 8 pushes the push rod 6 to slide on the housing 3. For details, please refer to [link / reference]. Figure 3 The thickness of the protrusion 8 gradually changes. When the turntable 7 starts to rotate counterclockwise, the protrusion 8 moves with the turntable 7. The arc surface 12 on the protrusion 8 gradually applies radial thrust to the push rod 6, thereby pushing the push rod 6 to slide outward. Furthermore, after the push rod 6 is pushed by the protrusion 8, it will act on the bottom of the clasp 4, causing the clasp 4 to rotate on the housing 3. In this way, the abutting parts 5 at the top of the three clasp 4 clamp the metallographic sample 17 from different directions, and the clamping is stable.

[0025] Please refer to this again. Figure 4 The adjustment assembly also includes a rotating shaft 9 fixedly mounted at the center of the turntable 7. The two ends of the rotating shaft 9 are rotatably mounted on the housing 3 and the base 1, respectively. A worm gear 10 is fixedly mounted on the rotating shaft 9, located above the turntable 7. A worm 11 is mounted on one side of the worm gear 10, with both ends rotatably mounted on the inner wall of the housing 3. The worm 11 meshes with the worm gear 10. When the worm 11 rotates, it drives the worm gear 10 to rotate. Since the worm gear 10 is fixed to the rotating shaft 9, and the rotating shaft 9 is fixedly connected to the center of the turntable 7, the turntable 7 begins to rotate.

[0026] In this embodiment, the three push rods 6 are arranged in a circular array on the housing 3, and the push rods 6 are correspondingly arranged with the claws 4. Specifically, the three push rods 6 are arranged in a 120° circular array, and each push rod 6 is pushed synchronously by the protrusion 8. One end of the push rod 6 abuts against the bottom of the claw 4, and the sliding of the push rod 6 will push the claw 4 to rotate around the support shaft 15 in the middle.

[0027] A knob 13 is fixedly installed at one end of the worm gear 11 that passes through the housing 3. When the operator rotates the knob 13, the knob 13 drives the worm gear 11 to rotate.

[0028] In this embodiment, a bracket 14 is provided on the housing 3, and a support shaft 15 is provided in the middle of the claw 4. The support shaft 15 is rotatably mounted on the bracket 14. The support shaft 15 in the middle of the claw 4 is rotatably mounted on the bracket 14 of the housing 3, so that the claw 4 can rotate with the support shaft 15 as the fulcrum.

[0029] In this invention, a spring 16 is fixedly connected to the lower part of the jaw 4, and the other end of the spring 16 is fixedly connected to the housing 3. When the clamp is in its initial state, the spring 16 is in a stretched state. Under the action of the tension of the spring 16, the abutment part 5 at the top of the jaw 4 is in a relatively open position, at which time the metallographic sample 17 can be placed on the support platform 2. Furthermore, when the turntable 7 rotates clockwise, the tension of the spring 16 causes the push rod 6 to return to its original position, at which time the abutment part 5 of the jaw 4 simultaneously releases the metallographic sample 17.

[0030] It is worth mentioning that the diameter of the metallographic sample 17 is larger than the diameter of the support stage 2, which provides a suitable positional relationship for the subsequent clamping of the metallographic sample 17 by the jaws 4. The upper surface of the metallographic sample 17 is in contact with the polishing disc for grinding or polishing.

[0031] The working principle of this utility model is as follows:

[0032] In use, the metallographic sample 17 is placed on the support platform 2. The operator rotates the knob 13, which drives the worm gear 11 to rotate, and the rotation of the worm gear 11 drives the worm wheel 10 to rotate. The worm wheel 10 is fixed on the rotating shaft 9, which is fixedly connected to the center of the turntable 7, thus causing the turntable 7 to start rotating. When the turntable 7 rotates counterclockwise, the arc-shaped surface 12 of the protrusion 8 pushes the push rod 6 to slide on the housing 3. After being pushed by the protrusion 8, the push rod 6 acts on the bottom of the chuck 4, causing the chuck 4 to rotate on the housing 3. In this way, the abutment parts 5 at the top of the three chucks 4 clamp the metallographic sample 17 from different directions, ensuring stable clamping. In addition, when the knob 13 is rotated in the opposite direction, the turntable 7 rotates clockwise, and the spring 16 pulls the push rod 6 to return to its original position. At this time, the abutment parts 5 of the chuck 4 release the metallographic sample 17 simultaneously.

[0033] In summary, this invention allows for stable clamping of metallographic samples simply by turning a knob. Its simple structure, compact size, and convenient operation reduce the demands on the operator. It solves the problem of small, difficult-to-handle samples during manual polishing in existing technologies. Furthermore, supported by the support platform, the abutments at the top of the three jaws clamp the metallographic sample from different directions, ensuring stable clamping. The design of the support platform and the jaw abutments ensures that the surface of the metallographic sample remains parallel to the polishing disc during polishing, avoiding uneven metallographic surfaces caused by uneven pressure during hand operation. This improves the accuracy and reliability of metallographic analysis and provides excellent conditions for subsequent metallographic observation.

[0034] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A metallographic sample holder, comprising a base (1), characterized in that, A support platform (2) for placing metallographic specimens (17) is provided above the base (1). A housing (3) is provided between the support platform (2) and the base (1). Several claws (4) are arranged in a ring array on the housing (3). The claws (4) are rotatably connected to the housing (3). The top of the claws (4) is provided with an abutment part (5). A push rod (6) is slidably provided on the housing (3). One end of the push rod (6) abuts against the bottom of the claws (4). An adjustment component is provided inside the housing (3). The adjustment component includes a turntable (7) and several protrusions (8) arranged in a ring array on the circumference of the turntable (7). The outer surface of the protrusions (8) protrudes outward to form an arc surface (12). The arc surface (12) abuts against the other end of the push rod (6).

2. The metallographic sample holder according to claim 1, characterized in that, The adjustment assembly also includes a rotating shaft (9) fixedly set at the center of the turntable (7). The two ends of the rotating shaft (9) are respectively rotatably set on the housing (3) and the base (1). A worm gear (10) is fixedly set on the rotating shaft (9). The worm gear (10) is located above the turntable (7). A worm (11) is set on one side of the worm gear (10). Both ends of the worm (11) are rotatably set on the inner wall of the housing (3). The worm (11) meshes with the worm gear (10).

3. A metallographic sample holder according to claim 1, characterized in that, Several push rods (6) are arranged in a ring array on the housing (3), and the push rods (6) and the claws (4) are arranged in a one-to-one correspondence.

4. A metallographic sample holder according to claim 2, characterized in that, A knob (13) is fixedly installed at one end of the worm gear (11) that passes through the housing (3).

5. A metallographic sample holder according to claim 1, characterized in that, A bracket (14) is provided on the housing (3), and a support shaft (15) is provided in the middle of the claw (4). The support shaft (15) is rotatably mounted on the bracket (14).

6. A metallographic sample holder according to claim 1, characterized in that, A spring (16) is fixedly connected to the lower part of the claw (4), and the other end of the spring (16) is fixedly connected to the housing (3).

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