Grinding and polishing device for metallographic specimen preparation

Abstract

The invention discloses a grinding and polishing device for metallographic specimen preparation, and relates to the technical field of metal grinding and polishing. The device comprises a base, a stand column is fixedly mounted at the top end of the right side of the base, a connecting plate is rotationally connected to the periphery of the top of the stand column in a limiting mode, a mounting cylinder is fixedly mounted at the end, away from the stand column, of the connecting plate, pressing rotating assemblies are arranged in and below the mounting cylinder, and a grinding assembly is arranged at the top of the base; the pressing rotating assembly comprises a first rotating shaft, and the center of the top of the interior of the mounting cylinder is rotationally connected with the first rotating shaft in a limiting mode. Various different relative displacement modes between the metallographic specimen and the grinding piece can be achieved, operation is simple and effective, various different grinding and polishing modes can be provided according to needs, the grinding and polishing effect can be improved, the grinding piece can be replaced conveniently, meanwhile, the stability of grinding piece installation in the grinding and polishing process can be guaranteed, and the grinding efficiency is improved. Normal proceeding of grinding and polishing is guaranteed, and the grinding and polishing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal grinding and polishing, and in particular to a grinding and polishing device for preparing metallographic samples. Background Art

[0002] The preparation of metallographic samples is the basis for microstructure analysis of materials such as aluminum, steel, and ceramics. The main preparation and research processes include sample cutting, sample mounting, sample grinding, sample polishing, and metallographic microstructure display. Sample grinding and polishing is a key link, which will directly affect the subsequent metallographic microstructure display and determine the results of metallographic research.

[0003] The existing grinding and polishing device for metallographic sample preparation still has the following defects during use: 1. The existing grinding and polishing device for metallographic sample preparation realizes the relative movement of the grinding sheet and the metallographic sample by driving the rotation of the grinding sheet or the metallographic sample, thereby realizing grinding and polishing. However, the relative movement mode between the grinding sheet and the metallographic sample is relatively single, resulting in a single grinding and polishing mode, and the grinding and polishing effect needs to be improved.

[0004] 2. When grinding and polishing metallographic specimens, different levels of gradual grinding are often required. Therefore, grinding discs with different mesh sizes need to be replaced during grinding and polishing. However, the existing grinding and polishing devices are more troublesome to replace the grinding discs, which reduces the efficiency of grinding and polishing. Some grinding and polishing devices that are easy to replace the grinding discs have poor fixation of the grinding discs, which are prone to offset or wrinkles during grinding, affecting the normal progress of grinding and polishing. Therefore, it is impossible to stably fix the grinding discs while facilitating the replacement of the grinding discs. Summary of the invention

[0005] The purpose of the present invention is to solve the problems that the relative movement between the grinding plate and the metallographic sample of the above-mentioned existing grinding and polishing device is relatively single, resulting in a single grinding and polishing method, the grinding and polishing effect needs to be improved, and the grinding plate cannot be stably fixed while being easy to replace, thereby reducing the grinding and polishing efficiency. The present invention provides a grinding and polishing device for preparing metallographic samples.

[0006] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: A grinding and polishing device for metallographic sample preparation comprises a base, a column is fixedly mounted on the top of the right side of the base, a connecting plate is rotatably connected to the outer limit of the top of the column, a mounting tube is fixedly mounted on the end of the connecting plate away from the column, a pressing and rotating assembly is arranged inside and below the mounting tube, and a grinding assembly is arranged on the top of the base.

[0007] Furthermore, the pressing and rotating assembly includes a rotating shaft 1, a central limiting rotation connection at the top of the inner top of the mounting cylinder is connected to the rotating shaft 1, a peripheral limiting sliding connection at the bottom of the rotating shaft 1 is connected to a rotating cylinder, the rotating cylinder extends downward to the lower side of the bottom end of the mounting cylinder, a turntable is fixedly installed at the bottom end of the rotating cylinder, a limiting groove is provided at the eccentric part of the turntable, the limiting groove passes through the turntable up and down, a self-rotating assembly is arranged inside the limiting groove, a connecting disk is fixedly installed at the top of the rotating cylinder, a circular arc cover is connected to the peripheral limiting rotation of the connecting disk, and a spring is fixedly connected between the top of the circular arc cover and the inner wall of the mounting cylinder.

[0008] Furthermore, a motor is fixedly mounted on the bottom end of the mounting tube, and the motor is transmission-connected with the rotating shaft 1, and the rotating shaft 1 is driven to rotate by the motor.

[0009] Furthermore, a roller is provided between the outer periphery of the connecting disk and the arc cover to reduce the friction between the connecting disk and the arc cover, so that when the arc cover is pressed downward to drive the connecting disk and the rotating drum to move downward, the connecting disk and the rotating drum can still rotate stably.

[0010] Furthermore, pressing rods are symmetrically fixedly installed at both ends of the arc cover, and the pressing rods extend to the outside of the mounting tube. A sliding groove is provided on the outside of the mounting tube aligned with the pressing rods, so that the pressing rods can drive the arc cover to move up and down stably in the sliding groove.

[0011] Furthermore, the self-rotation component includes an installing slider, the internal limiting sliding connection of the limiting groove is connected to the installing slider, the central limiting rotation connection inside the installing slider is connected to the second rotating shaft, the second rotating shaft extends downward to the lower side of the bottom end of the installing slider, the top of the installing slider is fixedly installed with a motor, the motor is transmission-connected to the second rotating shaft, the second rotating shaft is driven by the motor to rotate, the top of the installing slider is threadedly connected with a fastening bolt, the fastening bolt is rotated downward and the fastening bolt is in extrusion contact with the top end surface of the turntable to achieve the positioning of the installing slider, and a gear is fixedly installed on the periphery of the bottom of the second rotating shaft.

[0012] Furthermore, a metallographic sample is fixedly mounted on the bottom of the second rotating shaft.

[0013] Furthermore, the pressing and rotating assembly also includes a connecting bent rod and an inner gear ring. The outer periphery of the bottom of the mounting tube is fixedly installed with the inner gear ring downwardly through the connecting bent rod. The inner side of the inner gear ring is provided with teeth. When the rotating shaft 2 drives the metallographic sample for grinding and polishing, when the rotating shaft 2 drives the gear to move to the inner side of the inner gear ring, the gear can engage with the inner gear ring. Therefore, after the gear moves to engage with the inner gear ring, when the rotating shaft 2 drives the gear to rotate, the rotating shaft 2 and the gear can also rotate in a circle around the inner side of the inner gear ring by utilizing the engagement between the gear and the inner gear ring. When the turntable drives the rotating shaft 2 and the gear to rotate in a circle, the engagement between the gear and the inner gear ring can also drive the gear and the rotating shaft 2 to rotate on their own.

[0014] Furthermore, the grinding assembly includes a mounting table, which is fixedly installed in the center of the top of the base, and a grinding plate is fixedly placed above the mounting table. A ring is threadedly connected to the outer periphery of the top of the mounting table, and buckles are evenly fixedly installed on the outer periphery of the ring, and the buckles are used to limit and fix the grinding plate.

[0015] Furthermore, the downward screwing direction of the ring and the mounting table is the same as the direction of driving the metallographic specimen to rotate for grinding and polishing. Therefore, in the process of driving the metallographic specimen to rotate for grinding and polishing, the friction force generated can cause the ring to screw downward, thereby driving the buckle to increase the downward pressure on the grinding sheet, making the fixation of the grinding sheet more stable.

[0016] The beneficial effects of the present invention are as follows: 1. The present invention, through the design of the pressing and rotating component, the action of the rotating component, and the design of the inner gear ring, can realize a variety of different relative displacement modes between the metallographic sample and the polishing sheet, and the operation is simple and effective. It can provide a variety of different grinding and polishing methods according to needs, which is conducive to improving the grinding and polishing effect.

[0017] 2. The present invention, through the design of pressing the rotating component and the grinding component, can more conveniently replace the grinding sheet. At the same time, during the grinding and polishing process, it can increase the downward pressure on the grinding sheet, making the fixation of the grinding sheet more stable. Therefore, while facilitating the replacement of the grinding sheet, it can also ensure the stability of the installation of the grinding sheet during the grinding and polishing process, ensure the normal progress of grinding and polishing, and improve the efficiency of grinding and polishing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the local three-dimensional structure of the present invention Figure 1 ; Figure 3 It is a schematic diagram of the local three-dimensional structure of the present invention Figure 2 ; Figure 4It is a schematic diagram of the three-dimensional structure of the installation cylinder and the pressing and rotating assembly of the present invention; Figure 5 It is a partial cross-sectional three-dimensional structural schematic diagram of the installation cylinder and the pressing and rotating assembly of the present invention; Figure 6 It is a schematic diagram of the internal three-dimensional structure of the installation tube of the present invention; Figure 7 The present invention Figure 6 A magnified view of the structure at center; Figure 8 It is a schematic diagram of the three-dimensional structure of the turntable and the self-rotating assembly of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the bottom of the pressing and rotating assembly of the present invention; Fig.10 It is a schematic diagram of a partially cutaway three-dimensional structure of the rotation assembly of the present invention; Fig.11 It is a schematic diagram of the three-dimensional structure of the base of the present invention; Fig.12 It is a schematic diagram of the three-dimensional structure of the grinding assembly of the present invention.

[0019] Figure numerals: 1. base; 2. column; 3. connecting plate; 4. mounting cylinder; 41. slide groove; 5. press-rotate assembly; 51. rotating shaft 1; 52. rotating cylinder; 53. turntable; 54. limiting groove; 55. rotation assembly; 551. mounting slider; 552. rotating shaft 2; 553. motor; 554. fastening bolt; 555. gear; 56. connecting plate; 57. arc cover; 571. pressing rod; 58. spring; 59. connecting bent rod; 510. inner gear ring; 6. motor; 7. metallographic specimen; 8. grinding assembly; 81. mounting table; 82. grinding disc; 83. sleeve ring; 84. buckle. DETAILED DESCRIPTION

[0020] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0021] A grinding and polishing device for metallographic sample preparation according to a preferred embodiment of the present invention will be described in detail below. Figure 1-Figure 3 , Fig.10 As shown, a grinding and polishing device for metallographic sample preparation includes a base 1, a column 2 is fixedly installed on the top of the right side of the base 1, a connecting plate 3 is rotatably connected to the outer limit of the top of the column 2, a mounting cylinder 4 is fixedly installed on the end of the connecting plate 3 away from the column 2, a pressing and rotating component 5 is arranged inside and below the mounting cylinder 4, a metallographic sample 7 is installed in the pressing and rotating component 5, and a grinding component 8 is arranged on the top of the base 1.

[0022] During grinding and polishing, the metallographic sample 7 is first installed in the pressing and rotating assembly 5, and then the connecting plate 3 is rotated and the limiting rotation connection between the connecting plate 3 and the column 2 is utilized to rotate and move the pressing and rotating assembly 5 on which the metallographic sample 7 is installed to the top of the grinding assembly 8, and then the metallographic sample 7 is pressed downward by the pressing and rotating assembly 5, so that the metallographic sample 7 and the grinding assembly 8 are attached, and the metallographic sample 7 is driven to rotate, and then the grinding and polishing operation is performed on the metallographic sample 7 in cooperation with the grinding assembly 8.

[0023] Furthermore, if Figure 2-Figure 9 As shown, the pressing and rotating assembly 5 includes a rotating shaft 51, and the central limiting rotation connection of the top of the inner top of the mounting tube 4 is connected with the rotating shaft 51, and the bottom end of the mounting tube 4 is fixedly installed with a motor 6, and the motor 6 is transmission-connected with the rotating shaft 51, and the rotating shaft 51 is driven by the motor 6 to rotate.

[0024] The outer limit sliding connection of the bottom of the rotating shaft 51 is connected with a rotating drum 52, and the rotating drum 52 extends downward to the lower side of the bottom end of the mounting cylinder 4. A rotating disk 53 is fixedly installed at the bottom end of the rotating drum 52. A limit groove 54 is provided at the eccentric part of the rotating disk 53. The limit groove 54 passes through the rotating disk 53 up and down. A self-rotation component 55 is arranged inside the limit groove 54. A connecting disk 56 is fixedly installed at the top of the rotating drum 52. The outer limit rotation connection of the connecting disk 56 is connected with an arc cover 57. A roller is arranged between the outer periphery of the connecting disk 56 and the arc cover 57 to reduce the friction between the connecting disk 56 and the arc cover 57, so that when the arc cover 57 is pressed downward to drive the connecting disk 56 and the rotating drum 52 to move downward, the connecting disk 56 and the rotating drum 52 can still rotate stably.

[0025] Pressing rods 571 are symmetrically fixedly installed at both ends of the arc cover 57. The pressing rods 571 extend to the outside of the mounting tube 4, and a sliding groove 41 is opened on the outside of the mounting tube 4 aligned with the pressing rods 571, so that the pressing rods 571 can drive the arc cover 57 to move up and down stably in the sliding groove 41, and a spring 58 is fixedly connected between the top of the arc cover 57 and the inner wall of the mounting tube 4.

[0026] Furthermore, if Figure 9-10 As shown, the rotation component 55 includes an installation slider 551, the internal limit sliding connection of the limit groove 54 is connected to the installation slider 551, the central limit rotation connection inside the installation slider 551 is connected to the second rotating shaft 552, the second rotating shaft 552 extends downward to the lower side of the bottom end of the installation slider 551, and the bottom of the second rotating shaft 552 is fixedly installed with a metallographic sample 7.

[0027] A motor 553 is fixedly installed on the top of the mounting slider 551, and the motor 553 is transmission-connected to the second rotating shaft 552. The second rotating shaft 552 is driven to rotate by the motor 553. A fastening bolt 554 is threadedly connected to the top of the mounting slider 551. The mounting slider 551 is positioned by rotating the fastening bolt 554 downward and utilizing the extrusion contact between the fastening bolt 554 and the top end surface of the turntable 53. A gear 555 is fixedly installed on the periphery of the bottom of the second rotating shaft 552.

[0028] The pressing and rotating assembly 5 also includes a connecting bent rod 59 and an inner gear ring 510. The outer periphery of the bottom of the mounting tube 4 is fixedly mounted with the inner gear ring 510 downwardly through the connecting bent rod 59. The inner side of the inner gear ring 510 is provided with teeth. When the rotating shaft 552 drives the metallographic sample 7 to be polished, when the rotating shaft 552 drives the gear 555 to move to the inner side of the inner gear ring 510, the gear 555 can mesh with the inner gear ring 510. Therefore, when the gear 555 moves to After meshing with the inner gear ring 510, when the rotating shaft 2 552 drives the gear 555 to rotate, the meshing of the gear 555 and the inner gear ring 510 allows the rotating shaft 2 552 and the gear 555 to rotate in a circle around the inner side of the inner gear ring 510. When the turntable 53 drives the rotating shaft 2 552 and the gear 555 to rotate in a circle, the meshing of the gear 555 and the inner gear ring 510 can also drive the gear 555 and the rotating shaft 2 552 to rotate on their own.

[0029] The principle of pressing and rotating the metallographic sample 7 by the pressing and rotating assembly 5 is as follows: After the metallographic sample 7 is installed at the bottom of the second rotating shaft 552 and the pressing and rotating assembly 5 is rotated and moved to the top of the grinding assembly 8, the arc cover 57 and the connecting plate 56 are driven downward by pushing the pressing rod 571 downward, thereby driving the rotating drum 52 and the turntable 53 to move downward. In the process of the turntable 53 moving downward, the self-rotating assembly 55 can be driven downward, thereby causing the second rotating shaft 552 to drive the metallographic sample 7 to move downward to complete the attachment to the grinding assembly 8.

[0030] When it is necessary to drive the metallographic sample 7 to rotate to achieve grinding and polishing, the motor 553 can be used to drive the rotating shaft 552 to rotate, thereby driving the metallographic sample 7 to rotate, so as to achieve the self-rotation grinding of the metallographic sample 7 relative to the grinding assembly 8. Through the design of the fastening bolt 554, the position of the mounting slider 551 in the limit groove 54 can be adjusted, thereby adjusting the contact position of the metallographic sample 7 with the grinding assembly 8 during self-rotation grinding.

[0031] When it is necessary to drive the metallographic sample 7 to rotate in a circle to achieve grinding and polishing, after the fixing of the mounting slide block 551 is completed by using the fastening bolts 554, the rotating shaft 51 is driven to rotate by the motor 6. During the rotation of the rotating shaft 51, the limited sliding connection between the rotating shaft 51 and the rotating drum 52 can drive the rotating drum 52 to rotate, and then drive the turntable 53 and the self-rotating assembly 55 to rotate, so that the self-rotating assembly 55 can drive the metallographic sample 7 to rotate in a circle above the grinding assembly 8 to achieve grinding in a circular rotation relative to the grinding assembly 8. Similarly, the position of the mounting slide block 551 can be adjusted to achieve the adjustment of the contact position of the metallographic sample 7 with the grinding assembly 8 during circular rotation grinding.

[0032] When it is necessary to drive the metallographic sample 7 to rotate in a circle and rotate on its own to realize grinding and polishing, the installation slider 551 can be connected by limiting the sliding movement in the limiting groove 54. The installation slider 551 is first moved to the edge of the limiting groove 54. At this time, the gear 555 on the outer periphery of the second rotating shaft 552 can be driven to mesh with the teeth on the inner side of the inner gear ring 510. Therefore, when the motor 553 is started to drive the second rotating shaft 552 and the metallographic sample 7 to rotate on their own, the gear 555 can mesh with the inner gear ring 510 to make the gear 555 mesh with the inner gear ring 510. The inner side of the gear ring 510 rotates, thereby driving the turntable 53 to rotate, so as to realize the circular rotation of the metallographic sample 7. At the same time, the turntable 53 can also be driven to rotate by starting the motor 6, so that the metallographic sample 7 can rotate in a circular manner. During the rotation of the turntable 53, the gear 555 and the inner gear ring 510 are meshed with each other, so as to drive the gear 555 to rotate, thereby driving the rotating shaft 552 and the metallographic sample 7 to rotate on their own, so that the metallographic sample 7 can be polished in a self-rotating manner while the metallographic sample 7 rotates in a circular manner.

[0033] After the grinding and polishing is completed, the pressing rod 571 is released, and the arc cover 57 will drive the rotating drum 52 and the turntable 53 to move upward under the action of the restoring force of the spring 58, and then the mounting cylinder 4 is removed from the top of the base 1 through the connecting plate 3, so as to facilitate the removal of the polished metallographic sample 7.

[0034] Furthermore, if Figure 1 , Figure 11-Figure 12 As shown, the grinding assembly 8 includes a mounting table 81, the mounting table 81 is fixedly installed in the center of the top of the base 1, a grinding sheet 82 is fixedly placed above the mounting table 81, a ring 83 is threadedly connected to the outer periphery of the top of the mounting table 81, and a buckle 84 is evenly fixedly installed on the outer periphery of the ring 83, and the buckle 84 is used to limit and fix the grinding sheet 82.

[0035] The downward screwing direction of the ring 83 and the mounting platform 81 is the same as the direction of driving the metallographic sample 7 to rotate for grinding and polishing. Therefore, in the process of driving the metallographic sample 7 to rotate for grinding and polishing, the friction force generated can cause the ring 83 to screw downward, thereby driving the buckle 84 to increase the downward pressure on the grinding sheet 82, making the fixation of the grinding sheet 82 more stable.

[0036] The principle of grinding and polishing the metallographic sample 7 by using the grinding assembly 8 is as follows: After the metallographic sample 7 moves downward, it will adhere to the grinding sheet 82 above the mounting table 81 in the grinding assembly 8, and the metallographic sample 7 can be driven to rotate, so that the metallographic sample 7 can be ground and polished.

[0037] When the grinding sheet 82 needs to be replaced, the buckle 84 can be used to replace the grinding sheet 82 without removing the ring 83, which is more convenient and quick. During the grinding process, the ring 83 and the mounting table 81 are designed to have the same downward screwing direction as the direction of driving the metallographic specimen 7 to rotate for grinding and polishing. During grinding and polishing, the friction force generated can cause the ring 83 to screw downward, thereby driving the buckle 84 to increase the downward pressure on the grinding sheet 82, making the fixation of the grinding sheet 82 more stable, thereby facilitating the replacement of the grinding sheet 82 while ensuring the stability of the installation of the grinding sheet 82 during the grinding and polishing process.

[0038] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A grinding and polishing device for preparing a metallographic sample, comprising a base (1), characterized in that: A column (2) is fixedly mounted on the top of the right side of the base (1); a connecting plate (3) is rotatably connected to the outer periphery of the top of the column (2); a mounting tube (4) is fixedly mounted on the end of the connecting plate (3) away from the column (2); a pressing and rotating assembly (5) is arranged inside and below the mounting tube (4); and a grinding assembly (8) is arranged on the top of the base (1); The pressing and rotating assembly (5) comprises a rotating shaft (51), the central limit rotation connection of the top of the interior of the mounting cylinder (4) is connected to the rotating shaft (51), the peripheral limit sliding connection of the bottom of the rotating shaft (51) is connected to the rotating cylinder (52), the rotating cylinder (52) extends downward to the lower side of the bottom end of the mounting cylinder (4), a rotating disk (53) is fixedly installed at the bottom end of the rotating cylinder (52), a limit groove (54) is provided at the eccentric part of the rotating disk (53), the limit groove (54) passes through the rotating disk (53) from top to bottom, a self-rotating assembly (55) is arranged inside the limit groove (54), a connecting disk (56) is fixedly installed at the top end of the rotating cylinder (52), the peripheral limit rotation connection of the connecting disk (56) is connected to a circular arc cover (57), and a spring (58) is fixedly connected between the top end of the circular arc cover (57) and the inner wall of the mounting cylinder (4); The self-rotating component (55) comprises a mounting slider (551), the mounting slider (551) is slidably connected to the internal limiting position of the limiting groove (54), the central limiting position inside the mounting slider (551) is rotatably connected to the second rotating shaft (552), the second rotating shaft (552) extends downward to the lower side of the bottom end of the mounting slider (551), a motor (553) is fixedly installed on the top of the mounting slider (551), the motor (553) is transmission-connected to the second rotating shaft (552), the top of the mounting slider (551) is threadedly connected to a fastening bolt (554), and a gear (555) is fixedly installed on the periphery of the bottom of the second rotating shaft (552); The pressing and rotating assembly (5) further comprises a connecting bent rod (59) and an inner gear ring (510). The outer periphery of the bottom of the mounting tube (4) is fixedly mounted with the inner gear ring (510) downwardly via the connecting bent rod (59). The inner side of the inner gear ring (510) is provided with teeth. When the second rotating shaft (552) drives the metallographic sample (7) to be polished, when the second rotating shaft (552) drives the gear (555) to move to the inner side of the inner gear ring (510), the gear (555) can mesh with the inner gear ring (510).

2. The grinding and polishing device for preparing metallographic samples according to claim 1, characterized in that: A motor (6) is fixedly mounted on the bottom end of the mounting cylinder (4), and the motor (6) is in transmission connection with a rotating shaft 1 (51).

3. The grinding and polishing device for preparing metallographic samples according to claim 1, characterized in that: A roller is provided between the periphery of the connecting disk (56) and the arc cover (57).

4. The grinding and polishing device for preparing metallographic samples according to claim 1, characterized in that: Pressing rods (571) are symmetrically fixedly mounted at both ends of the arc cover (57), the pressing rods (571) extend to the outside of the mounting tube (4), and a sliding groove (41) is provided on the outside of the mounting tube (4) aligned with the pressing rods (571).

5. The grinding and polishing device for preparing metallographic samples according to claim 1, characterized in that: A metallographic sample (7) is fixedly mounted on the bottom of the second rotating shaft (552).

6. The grinding and polishing device for preparing metallographic samples according to claim 5, characterized in that: The grinding assembly (8) comprises: A mounting platform (81), wherein a mounting platform (81) is fixedly mounted at the center of the top of the base (1); A grinding sheet (82), wherein the grinding sheet (82) is fixedly placed above the mounting platform (81); A collar (83), the outer periphery of the top of the mounting platform (81) being threadedly connected to the collar (83); Buckles (84), the outer periphery of the collar (83) is evenly and fixedly mounted with buckles (84), the buckles (84) being used to limit and fix the grinding sheet (82).

7. The grinding and polishing device for preparing metallographic samples according to claim 6, characterized in that: The downward screwing direction of the collar (83) and the mounting platform (81) is the same as the direction of driving the metallographic sample (7) to rotate for grinding and polishing.

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