A grinding and polishing device for preparing metallographic specimens

Abstract

The present invention discloses a grinding and polishing device for preparing a metallographic specimen, which relates to the technical field of metal grinding and polishing. The present invention includes a base, and a column is fixedly installed at the top of the right side of the base. The periphery of the top of the column is rotationally connected with a connecting plate in a limited manner. One end of the connecting plate away from the column is fixedly installed with an installation cylinder. A pressing and rotating assembly is arranged inside and below the installation cylinder. A grinding assembly is arranged on the top of the base. The pressing and rotating assembly includes a first rotating shaft, and the first rotating shaft is rotationally connected with the center of the inner top of the installation cylinder in a limited manner. The present invention can realize various different relative displacement modes between the metallographic specimen and the grinding disc, and the operation is simple and effective. It can provide various different grinding and polishing methods according to needs, which is beneficial to improving the grinding and polishing effect. While facilitating the replacement of the grinding disc, it can also ensure the stability of the installation of the grinding disc during the grinding and polishing process, ensure the normal progress of the grinding and polishing, and improve the efficiency of the grinding and polishing.

Description

Technical Field

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

[0002] The preparation of metallographic specimens is the basis for the microscopic structure analysis of materials such as aluminum, steel, and ceramics. Its main preparation and research processes include specimen cutting, specimen embedding, specimen grinding, specimen polishing, and the display of metallographic microstructure. The grinding and polishing of specimens is a key link, which will directly affect the subsequent display of the microscopic structure of the metallography and determine the results of metallographic research.

[0003] However, the existing grinding and polishing devices for preparing metallographic specimens still have the following defects during use:

[0004] 1. When the existing grinding and polishing devices for preparing metallographic specimens perform grinding and polishing, they achieve the relative movement between the grinding disc and the metallographic specimen by driving the rotation of the grinding disc or the metallographic specimen, so as to achieve grinding and polishing. However, the relative movement mode between the grinding disc and the metallographic specimen is relatively single, resulting in a single grinding and polishing method, and the grinding and polishing effect needs to be improved.

[0005] 2. When grinding and polishing metallographic specimens, it is often necessary to perform step-by-step grinding of different grades. Therefore, when performing grinding and polishing, it is necessary to replace grinding discs of different mesh numbers. However, the existing grinding and polishing devices are relatively troublesome to replace the grinding discs, which reduces the grinding and polishing efficiency. And some grinding and polishing devices that are convenient for replacing grinding discs have poor fixation of the grinding discs, and are prone to deviation or wrinkles during grinding, affecting the normal progress of grinding and polishing. Therefore, it is impossible to meet the requirements of stable fixation of the grinding discs while being convenient for replacing the grinding discs. Summary of the Invention

[0006] The purpose of the present invention is to solve the problems that the relative movement mode between the grinding disc and the metallographic specimen of the existing grinding and polishing device is relatively single, resulting in a single grinding and polishing method and a grinding and polishing effect that needs to be improved, and it is impossible to meet the requirements of stable fixation of the grinding disc while being convenient for replacing the grinding disc, reducing the grinding and polishing efficiency. The present invention provides a grinding and polishing device for preparing metallographic specimens.

[0007] The present invention specifically adopts the following technical solutions to achieve the above purpose:

[0008] A grinding and polishing device for preparing metallographic specimens, including a base. A column is fixedly installed at the top of the right side of the base. The outer periphery of the top of the column is rotationally connected with a connecting plate in a limited manner. One end of the connecting plate away from the column is fixedly installed with an installation cylinder. A pressing and rotating assembly is arranged inside and below the installation cylinder. A grinding component is arranged on the top of the base.

[0009] Furthermore, the pressing and rotating assembly includes a first rotating shaft. The center of the inner top of the installation cylinder is limited and rotationally connected with the first rotating shaft. The periphery of the bottom of the first rotating shaft is limited and slidably connected with a rotating cylinder. The rotating cylinder extends downward to the lower side of the bottom end of the installation cylinder. The bottom end of the rotating cylinder is fixedly installed with a turntable. A limiting groove is opened at the eccentric position of the turntable. The limiting groove runs through the turntable up and down. An automatic rotation assembly is arranged inside the limiting groove. The top end of the rotating cylinder is fixedly installed with a connecting plate. The periphery of the connecting plate is limited and rotationally connected with an arc-shaped cover. A spring is fixedly connected between the top end of the arc-shaped cover and the inner wall of the installation cylinder.

[0010] Furthermore, a motor is fixedly installed at the bottom end of the installation cylinder, and the motor is in transmission connection with the first rotating shaft to drive the first rotating shaft to rotate by using the motor.

[0011] Furthermore, rollers are arranged between the periphery of the connecting plate and the arc-shaped cover to reduce the friction between the connecting plate and the arc-shaped cover, so that when pressing the arc-shaped cover downward to drive the connecting plate and the rotating cylinder to move downward, the connecting plate and the rotating cylinder can still rotate stably.

[0012] Furthermore, pressing rods are symmetrically and fixedly installed at both ends of the arc-shaped cover. The pressing rods extend to the outside of the installation cylinder, and a sliding groove is opened at the position of the outside of the installation cylinder opposite to the pressing rods, so that the pressing rods can drive the arc-shaped cover to move up and down stably in the sliding groove.

[0013] Furthermore, the automatic rotation assembly includes an installation slider. The installation slider is limited and slidably connected inside the limiting groove. The center of the installation slider is limited and rotationally connected with a second rotating shaft. The second rotating shaft extends downward to the lower side of the bottom end of the installation slider. A motor is fixedly installed at the top end of the installation slider. The motor is in transmission connection with the second rotating shaft to drive the second rotating shaft to rotate by using the motor. A fastening bolt is threadedly connected to the top of the installation slider. By rotating the fastening bolt downward, the installation slider is positioned by the extrusion contact between the fastening bolt and the top end face of the turntable. A gear is fixedly installed on the periphery of the bottom of the second rotating shaft.

[0014] Furthermore, a metallographic specimen is fixedly installed at the bottom of the second rotating shaft.

[0015] Further, the pressing and rotating assembly further includes a connecting bent rod and an internal gear ring. The outer periphery of the bottom of the installation cylinder is fixedly installed with an internal gear ring downward through the connecting bent rod. Teeth are provided on the inner side of the internal gear ring. When the second rotating shaft drives the metallographic specimen for grinding and polishing, when the second rotating shaft drives the gear to move to the inner side of the internal gear ring, the gear can mesh with the internal gear ring. Therefore, after the gear moves to mesh with the internal gear ring, when the second rotating shaft drives the gear to rotate, by using the meshing of the gear and the internal gear ring, the second rotating shaft and the gear can also rotate circumferentially around the inner side of the internal gear ring. And when the turntable drives the second rotating shaft and the gear to rotate circumferentially, by using the meshing of the gear and the internal gear ring, it can also drive the gear and the second rotating shaft to rotate self - rotatably.

[0016] Further, the grinding assembly includes an installation table. The installation table is fixedly installed in the center of the top of the base. A grinding disc is fixedly placed above the installation table. A collar is threadedly connected to the outer periphery of the top of the installation table. Clasps are evenly fixedly installed on the outer periphery of the collar. The clasps are used to limit and fix the grinding disc.

[0017] Further, the direction of the collar screwing downwards with respect to the installation table is the same as the direction of driving the metallographic specimen to rotate for grinding and polishing. Therefore, during the process of driving the metallographic specimen to rotate for grinding and polishing, the generated frictional force can cause the collar to screw downwards, thereby driving the clasps to increase the downward pressure on the grinding disc, making the fixation of the grinding disc more stable.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. In the present invention, through the design of the pressing and rotating assembly, combined with the action of the self - rotating assembly and the design of the internal gear ring, various different relative displacement methods between the metallographic specimen and the grinding disc can be achieved, and the operation is simple and effective. It can provide various different grinding and polishing methods according to requirements, which is beneficial to improving the grinding and polishing effect.

[0020] 2. In the present invention, through the design of the pressing and rotating assembly and the grinding assembly, the grinding disc can be replaced more conveniently. At the same time, during the grinding and polishing process, the downward pressure on the grinding disc can be increased, making the fixation of the grinding disc more stable. Thus, while facilitating the replacement of the grinding disc, the stability of the grinding disc installation during the grinding and polishing process can be ensured, guaranteeing the normal progress of grinding and polishing and improving the efficiency of grinding and polishing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three - dimensional structural schematic diagram of the present invention;

[0022] Figure 2 is a partial three - dimensional structural schematic Figure 1 ;

[0023] Figure 3Schematic of the local three-dimensional structure of the present invention Figure 2 ;

[0024] Figure 4 Schematic of the three-dimensional structure of the mounting cylinder and the pressing and rotating assembly of the present invention;

[0025] Figure 5 Schematic of the partially sectional three-dimensional structure of the mounting cylinder and the pressing and rotating assembly of the present invention;

[0026] Figure 6 Schematic of the three-dimensional structure inside the mounting cylinder of the present invention;

[0027] Figure 7 is the present invention Figure 6 Enlarged view of the structure at A in;

[0028] Figure 8 Schematic of the three-dimensional structure of the turntable and the self-rotating assembly of the present invention;

[0029] Figure 9 Schematic of the three-dimensional structure of the bottom of the pressing and rotating assembly of the present invention;

[0030] Figure 10 Schematic of the partially sectional three-dimensional structure of the self-rotating assembly of the present invention;

[0031] Figure 11 Schematic of the three-dimensional structure of the base of the present invention;

[0032] Figure 12 Schematic of the three-dimensional structure of the grinding assembly of the present invention.

[0033] Reference numerals: 1, base; 2, column; 3, connecting plate; 4, mounting cylinder; 41, chute; 5, pressing and rotating assembly; 51, first rotating shaft; 52, rotating cylinder; 53, turntable; 54, limiting groove; 55, self-rotating assembly; 551, mounting slider; 552, second rotating shaft; 553, motor; 554, fastening bolt; 555, gear; 56, connecting disc; 57, arc cover; 571, pressing rod; 58, spring; 59, connecting bent rod; 510, internal gear ring; 6, motor; 7, metallographic specimen; 8, grinding assembly; 81, mounting table; 82, grinding disc; 83, collar; 84, buckle. Detailed implementation manners

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0035] A grinding and polishing device for preparing metallographic specimens according to a preferred embodiment of the present invention will be elaborated in detail below, as Figures 1-3 , Figure 10As shown in the figure, a grinding and polishing device for preparing a metallographic specimen includes a base 1. At the top of the right side of the base 1, a column 2 is fixedly installed. The periphery of the top of the column 2 is rotationally connected with a connecting plate 3 in a limited way. At one end of the connecting plate 3 away from the column 2, an installation cylinder 4 is fixedly installed. Inside and below the installation cylinder 4, a pressing and rotating assembly 5 is arranged. A metallographic specimen 7 is installed in the pressing and rotating assembly 5. At the top of the base 1, a grinding assembly 8 is arranged.

[0036] When grinding and polishing, first install the metallographic specimen 7 in the pressing and rotating assembly 5. Then, by rotating the connecting plate 3, using the limited rotational connection between the connecting plate 3 and the column 2, move the pressing and rotating assembly 5 with the installed metallographic specimen 7 rotationally to the upper part of the grinding assembly 8. Then, press the metallographic specimen 7 downward through the pressing and rotating assembly 5, so that the metallographic specimen 7 adheres to the grinding assembly 8, and drive the metallographic specimen 7 to rotate, thereby cooperating with the grinding assembly 8 to perform grinding and polishing operations on the metallographic specimen 7.

[0037] Furthermore, as Figures 2-9 shown, the pressing and rotating assembly 5 includes a first rotating shaft 51. The center of the inner top of the installation cylinder 4 is rotationally connected with the first rotating shaft 51 in a limited way. At the bottom end of the installation cylinder 4, a motor 6 is fixedly installed, and the motor 6 is in transmission connection with the first rotating shaft 51, and the motor 6 is used to drive the first rotating shaft 51 to rotate.

[0038] The periphery of the bottom of the first rotating shaft 51 is slidably connected with a rotating cylinder 52 in a limited way. The rotating cylinder 52 extends downward to the lower side of the bottom end of the installation cylinder 4. At the bottom end of the rotating cylinder 52, a turntable 53 is fixedly installed. A limiting groove 54 is opened at the eccentric position of the turntable 53. The limiting groove 54 penetrates through the turntable 53 up and down. An automatic rotating assembly 55 is arranged inside the limiting groove 54. At the top end of the rotating cylinder 52, a connecting disc 56 is fixedly installed. The periphery of the connecting disc 56 is rotationally connected with an arc cover 57 in a limited way. Between the periphery of the connecting disc 56 and the arc cover 57, rollers are arranged, so as to reduce the friction between the connecting disc 56 and the arc cover 57, so that when pressing the arc cover 57 downward to drive the connecting disc 56 and the rotating cylinder 52 to move downward, the connecting disc 56 and the rotating cylinder 52 can still rotate stably.

[0039] At both ends of the arc cover 57, pressing rods 571 are symmetrically fixedly installed. The pressing rods 571 extend to the outside of the installation cylinder 4, and at the position of the outside of the installation cylinder 4 aligned with the pressing rods 571, a sliding groove 41 is opened, so that the pressing rods 571 can drive the arc cover 57 to move up and down stably in the sliding groove 41. A spring 58 is fixedly connected between the top end of the arc cover 57 and the inner wall of the installation cylinder 4.

[0040] Even further, as Figures 9-10As shown in the figure, the rotation assembly 55 includes a mounting slider 551. The mounting slider 551 is internally and limit-slidingly connected to the inside of the limiting groove 54. A second rotating shaft 552 is centrally and limit-rotationally connected to the inside of the mounting slider 551. The second rotating shaft 552 extends downward to the lower side of the bottom end of the mounting slider 551. A metallographic specimen 7 is fixedly installed at the bottom of the second rotating shaft 552.

[0041] A motor 553 is fixedly installed at the top end of the mounting slider 551. The motor 553 is drivingly connected to the second rotating shaft 552. The motor 553 is used to drive the second rotating shaft 552 to rotate. A fastening bolt 554 is threadedly connected to the top of the mounting slider 551. By rotating the fastening bolt 554 downward, the mounting slider 551 is positioned by the squeezing contact between the fastening bolt 554 and the top end face of the turntable 53. A gear 555 is fixedly installed on the outer periphery of the bottom of the second rotating shaft 552.

[0042] The pressing and rotating assembly 5 further includes a connecting bent rod 59 and an internal gear ring 510. The internal gear ring 510 is fixedly installed downward through the connecting bent rod 59 on the outer periphery of the bottom of the mounting cylinder 4. Teeth are provided on the inner side of the internal gear ring 510. When the second rotating shaft 552 drives the metallographic specimen 7 to perform grinding and polishing, when the second rotating shaft 552 drives the gear 555 to move to the inner side of the internal gear ring 510, the gear 555 can mesh with the internal gear ring 510. Therefore, after the gear 555 moves to mesh with the internal gear ring 510, when the second rotating shaft 552 drives the gear 555 to rotate, by the meshing of the gear 555 and the internal gear ring 510, the second rotating shaft 552 and the gear 555 can also perform circular rotation around the inner side of the internal gear ring 510. And when the turntable 53 drives the second rotating shaft 552 and the gear 555 to perform circular rotation, by the meshing of the gear 555 and the internal gear ring 510, the gear 555 and the second rotating shaft 552 can also be driven to rotate self.

[0043] The principle of using the pressing and rotating assembly 5 to press and rotate the metallographic specimen 7 is as follows:

[0044] After the installation of the metallographic specimen 7 at the bottom of the second rotating shaft 552 is completed and the pressing and rotating assembly 5 is rotated and moved above the grinding assembly 8, by pushing the pressing rod 571 downward, the arc cover 57 and the connecting disc 56 are driven to move downward, and then the rotating cylinder 52 and the turntable 53 are driven to move downward. During the downward movement of the turntable 53, the rotation assembly 55 can be driven to move downward, so that the second rotating shaft 552 drives the metallographic specimen 7 to move downward to complete the attachment to the grinding assembly 8.

[0045] When it is necessary to drive the metallographic specimen 7 to rotate self - clockwise to achieve grinding and polishing, the motor 553 can be used to drive the second rotating shaft 552 to rotate, thereby driving the metallographic specimen 7 to rotate self - clockwise, realizing the grinding of the metallographic specimen 7 relative to the grinding assembly 8 in a self - rotating manner. Through the design of the fastening bolt 554, the position of the mounting slider 551 in the limiting groove 54 can be adjusted, and then the contact position between the metallographic specimen 7 and the grinding assembly 8 during self - rotating grinding can be adjusted.

[0046] When it is necessary to drive the metallographic specimen 7 to rotate circumferentially to achieve grinding and polishing, after the mounting slider 551 is fixed by using the fastening bolt 554, the motor 6 drives the first rotating shaft 51 to rotate. During the rotation of the first rotating shaft 51, by using the limiting sliding connection between the first rotating shaft 51 and the rotating cylinder 52, the rotating cylinder 52 can be driven to rotate, thereby driving the turntable 53 and the self - rotating assembly 55 to rotate, so that the self - rotating assembly 55 can drive the metallographic specimen 7 to rotate circumferentially above the grinding assembly 8 to achieve grinding in a circumferential rotation manner relative to the grinding assembly 8. Similarly, the position of the mounting slider 551 can also be adjusted to adjust the contact position between the metallographic specimen 7 and the grinding assembly 8 during circumferential rotation grinding.

[0047] When it is necessary to drive the metallographic specimen 7 to rotate circumferentially and also rotate self - clockwise to achieve grinding and polishing, through the limiting sliding connection of the mounting slider 551 in the limiting groove 54, the mounting slider 551 is first moved to the edge of the limiting groove 54. At this time, the gear 555 on the periphery of the second rotating shaft 552 can be driven to mesh with the teeth on the inner side of the internal gear ring 510. Therefore, when the motor 553 is started to drive the second rotating shaft 552 and the metallographic specimen 7 to rotate self - clockwise, by using the meshing of the gear 555 and the internal gear ring 510, the gear 555 can be rotated inside the internal gear ring 510, thereby driving the turntable 53 to rotate to achieve the circumferential rotation of the metallographic specimen 7. At the same time, the turntable 53 can also be driven to rotate by starting the motor 6 to make the metallographic specimen 7 rotate circumferentially. During the rotation of the turntable 53, by using the meshing of the gear 555 and the internal gear ring 510, the gear 555 can be driven to rotate, thereby driving the second rotating shaft 552 and the metallographic specimen 7 to rotate self - clockwise. Thus, grinding and polishing in a manner that the metallographic specimen 7 rotates circumferentially and also rotates self - clockwise can be achieved.

[0048] After grinding and polishing are completed, the pressing rod 571 is released, and the arc cover 57 will drive the rotating cylinder 52 and the turntable 53 to move upward under the restoring force of the spring 58. Then, the mounting cylinder 4 is moved away from above the base 1 through the connecting plate 3, which is convenient for removing the ground and polished metallographic specimen 7.

[0049] Further, as Figure 1 、 Figures 11-12As 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.

[0050] 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.

[0051] The principle of grinding and polishing the metallographic sample 7 by using the grinding assembly 8 is as follows:

[0052] 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 polished by driving the rotation of the metallographic sample 7.

[0053] 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.

[0054] 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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