CN114750045A

CN114750045A - Auxiliary device for metallographic specimen grinding and polishing machine

Info

Publication number: CN114750045A
Application number: CN202210525973.1A
Authority: CN
Inventors: 胡付超; 沈以赴; 周益民; 李发亮; 程元光; 余涛; 周广铭
Original assignee: Yancheng Huitu Technology Co ltd; Yancheng Institute of Technology
Current assignee: Yancheng Huitu Technology Co ltd; Yancheng Institute of Technology
Priority date: 2022-05-13
Filing date: 2022-05-13
Publication date: 2022-07-15

Abstract

The invention provides an auxiliary device for a metallographic specimen grinding and polishing machine, which comprises a base and a grinding and polishing pressure plate, wherein the base is rotatably connected with a support frame, one end of the support frame is fixedly provided with a sliding block shell, the other end of the sliding block shell is movably provided with a transverse support, and one side of the transverse support is provided with a butterfly bolt II; install the pillar on the pressure disk is thrown in the mill, be equipped with the pneumatic cylinder in the pillar, the pneumatic cylinder intussuseption is filled with hydraulic medium, evenly has laid a plurality of sample grooves and sample groove on the pressure disk is thrown in the mill, the sample groove is located directly over the sample groove, and the metallography is ground and is thrown the sample and be located the sample inslot, the pneumatic cylinder with be equipped with the medium runner between the sample groove, medium runner one end movable mounting has the shrink to expand the cover, it is equipped with the draw-in groove to grind and throw pressure magnitude when the pressure is controllable when throwing to the metallography sample, can in time adjust the course of working, observes the mill condition of throwing of sample.

Description

Auxiliary device for metallographic specimen grinding and polishing machine

Technical Field

The invention belongs to the technical field of metallographic specimen grinding and polishing machines, and particularly relates to an auxiliary device for a metallographic specimen grinding and polishing machine.

Background

The application of the metal material in various fields of aerospace, automobile, biomedicine and the like is very wide, the microstructure characteristics and the performance of the material have important guiding significance on research work in the research process of the metal material, wherein metallographic examination plays an extremely important role, the preparation work of a sample usually comprises various working procedures of cutting sampling, inlaying, coarse grinding, fine grinding, polishing, corrosion and the like in the preparation process of a metallographic specimen, wherein the polishing and the polishing of the sample are two very important working procedures, the preparation of the metallographic specimen requires that a polishing surface is smooth, bright and traceless and can be clearly mapped, so the technical requirement on an operator is higher, the currently used metallographic specimen polishing and polishing machine mainly comprises two types of an automatic polishing and polishing machine and a manual polishing and polishing machine, when the existing automatic polishing and polishing machine is used for observing the polishing and polishing condition of the metallographic specimen, the sample can be observed only after the grinding and polishing disc stops rotating, the pressure applied during grinding and polishing of the sample is large, the grinding and polishing effect is poor, grinding and polishing of only one sample can be performed at one time, the workload is large when a plurality of metallographic samples are ground and polished simultaneously, long time is needed, and the efficiency is low.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides an auxiliary device for a metallographic sample polishing machine, which can polish a plurality of samples simultaneously and can greatly improve the polishing efficiency when a large number of samples are available.

The invention provides the following technical scheme:

the utility model provides a metallographic specimen grinds throws machine auxiliary device, includes:

the device comprises a base, a positioning hole, a support frame, a transverse support and a butterfly bolt II, wherein the positioning hole is used for installing an auxiliary device on a metallographic specimen grinding and polishing machine;

grind and throw the pressure disk, install the pillar on it, be equipped with the pneumatic cylinder in the pillar, the pneumatic cylinder intussuseption is filled with hydraulic medium, evenly has laid a plurality of sample grooves and sample groove on grinding and throwing the pressure disk, the sample groove is located directly over the sample groove, and the metallography is ground and is thrown the sample and be located the sample inslot, the pneumatic cylinder with be equipped with the medium runner between the sample groove, medium runner one end movable mounting has the shrink to expand the cover, grinding and throwing pressure disk top is equipped with the draw-in groove.

Furthermore, a rotating shaft is installed at the bottom end of the supporting frame, the rotating shaft is located in the base and is rotatably connected with the base, a first butterfly bolt is connected to the base in a threaded mode, the axis of the first butterfly bolt is perpendicular to the axis of the rotating shaft, and the rotating shaft is fixed through screwing the first butterfly bolt.

Further, be equipped with the gear shaft locating hole on the support frame, the gear shaft of installation movable mounting in the gear shaft locating hole, the cover is equipped with the gear on the gear shaft, be equipped with the gear hole on the support frame, gear hole cross-section is the same with the gear cross-section, slider shell one end is the opening, the gear hole passes the slider shell with the open end of slider shell communicates with each other, the symmetry is equipped with the spout on the slip shell.

Further, movable sliding block is installed to horizontal support one side, movable sliding block both ends are equipped with the tongue, the tongue is located in the spout, and tongue and spout sliding connection, movable sliding block installs the rack in one side, the rack with gear engagement.

Furthermore, handles are fixedly mounted at two ends of the gear shaft, the gear shaft is rotated in the gear shaft positioning hole through manual operation of the handles, and a hole nut is further mounted on the gear shaft and located between the handle and the support frame.

Further, be equipped with location shaft hole and annular bulge on the horizontal support, annular bulge is coaxial with the location shaft hole, and annular bulge is located location shaft hole below, annular bulge outer wall is equipped with the annular groove, the cover is equipped with the fine setting scroll cover on the annular bulge, fine setting scroll cover be equipped with annular groove complex annular tongue and screw thread, the downthehole loose axle that installs of location shaft.

Furthermore, the loose axle all adopts threaded connection with location shaft hole, fine setting spiral shell, the loose axle bottom is equipped with the draw-in groove structure.

Furthermore, the clamping groove structure of the movable shaft is matched and connected with the clamping groove through a movable sleeve.

Furthermore, a screw sleeve is connected to the support column in a threaded manner, a piston pressure rod is movably mounted in the stand column, butterfly bolts are connected to two ends of the piston pressure rod III, the screw sleeve is located above the piston pressure rod, a through groove is formed in the support column, the piston pressure rod moves up and down along the through groove, a piston is movably mounted in the hydraulic cylinder, and the top end of the piston penetrates through the hydraulic cylinder and is connected with the piston pressure rod.

Further, movable mounting has the sample briquetting in the sample groove, and the cross-section in sample groove is circular, is equipped with a plurality of bearing diagonal poles between pillar and the grinding and polishing pressure disk, the bearing diagonal pole is located between the adjacent sample groove.

The invention has the beneficial effects that:

1. the auxiliary device is directly arranged on the grinding and polishing machine through the base, simple parts are added on the basis of the original metallographic grinding and polishing machine without changing, the auxiliary device can be freely detached and used, and the quality of a grinding and polishing sample cannot be influenced.

2. The grinding and polishing pressure plate is provided with the plurality of sample grooves, so that a plurality of samples can be installed at the same time, the plurality of samples can be simultaneously ground and polished, the working principle is simple, a worker only needs to clamp, adjust and fix the height position of the samples during grinding and polishing and check the grinding and polishing effect of each grinding and polishing sample, the safety of the experiment is improved, the labor intensity is reduced, the plurality of samples are simultaneously ground and polished, the grinding and polishing efficiency is greatly improved, and a large amount of time can be saved for the worker.

3. The bottom end of the supporting frame is provided with a rotating shaft, so that the relative position of the grinding and polishing pressure plate and the grinding and polishing machine can be flexibly rotated and adjusted, and an auxiliary device can be used for grinding and polishing.

4. Adopt the movable sleeve cooperation draw-in groove structure to be connected between loose axle and the grinding and polishing pressure disk, when guaranteeing to have good stability, compare in traditional threaded connection installs and removes the in-process in the device, operate convenient and fast more, the effectual efficiency of installing and removing that has improved this equipment.

5. The hydraulic transmission design is adopted, a plurality of samples are clamped and disassembled simultaneously, and the inclined supports and the hydraulic medium flow passages which are uniformly distributed on the grinding and polishing pressure plate can ensure that each sample is uniformly stressed in the processes of pressing and grinding and polishing, so that the friction surface of the sample in the process of grinding and polishing is more uniform, and the grinding and polishing effect is better. Evenly distributed's sample groove, sample groove and hydraulic pressure press from both sides tight design, can guarantee that the sample by better installation, fixed and take out, the sample is observed also convenient and fast more.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a cross-sectional structural view of the column of the present invention;

FIG. 3 is a schematic structural diagram of a metallographic polished sample according to the present invention;

FIG. 4 is an isometric view of the polishing platen of the present invention;

FIG. 5 is a front view of the support frame of the present invention;

FIG. 6 is a schematic top view of the stand of the present invention;

FIG. 7 is a schematic view of the movable slider of the present invention;

figure 8 is an isometric view of the activity of the present invention.

Labeled as: 1. a base; 2. a butterfly bolt I; 3. a rotating shaft; 4. a support frame; 401. a gear shaft positioning hole; 402. a gear hole; 5. a handle; 6. a gear; 7. a gear shaft; 8. a hole nut; 9. a rack; 10. a slider housing; 11. a chute; 12. a convex groove; 13. a movable slide block; 14. transversely supporting; 1401. an annular boss; 15. positioning the shaft hole; 16. an annular groove; 17. a butterfly bolt II; 18. fine adjustment of the screw sleeve; 19. a movable shaft; 20. a movable sleeve; 21. a spiral casing; 22. a butterfly bolt III; 23. grinding and polishing the pressure plate; 24. an inclined support rod; 25. a pillar; 26. a card slot; 27. a hydraulic cylinder; 28. a piston; 29. a piston compression bar; 30. a hydraulic medium; 31. a medium flow passage; 32. shrinking and expanding the sleeve; 33. pressing the test sample into a block; 34. a sampling groove; 35. a sample tank; 36. grinding and polishing a sample in a metallographic phase; 37. a through groove.

Detailed Description

Example one

As shown in fig. 1-4, an auxiliary device for a metallographic specimen polishing machine comprises a base 1, a polishing platen 23, a plurality of specimen grooves 35 and sampling grooves 34 are uniformly distributed on the polishing platen 23, a metallographic polishing specimen 36 is positioned in the specimen grooves 35, so that a plurality of metallographic polishing specimens 36 can be simultaneously polished, the specimen grooves 35 are positioned right above the sampling grooves 34, the cross sections of the specimen grooves 35 are circular, the longest distance between two end points on the sampling grooves 34 is greater than the diameter of the specimen grooves 35, the shortest distance between two end points on the sampling grooves 34 is less than the diameter of the specimen grooves 35, inclined support rods 24 and medium flow channels 31 are uniformly distributed on the polishing platen 23, so that the stress of each metallographic polishing specimen in the compressing and polishing processes can be ensured to be uniform, the friction surface of the specimen in the polishing process is more uniform, a better polishing effect is achieved, and the specimen grooves 35, the sampling grooves 34 and the hydraulic clamping design are uniformly distributed, can guarantee that the sample is by better installation, fixed and take out, the sample is observed also convenient and fast more.

Install pillar 25 on the pressure disk 23 of polishing, be equipped with pneumatic cylinder 27 in the pillar 25, hydraulic medium 30 is filled in the pneumatic cylinder 27, and threaded connection has screw sleeve 21 on the pillar 25, and movable mounting has piston depression bar 29 in the stand 25, piston depression bar 29 both ends are connected with butterfly bolt three 22, and screw sleeve 21 is located piston depression bar 29 top, is equipped with logical groove 37 on the pillar 25, and piston depression bar 29 reciprocates along logical groove 37, movable mounting has piston 28 in the pneumatic cylinder 27, the piston 28 top is passed pneumatic cylinder 27 and is connected with piston depression bar 29, because pillar 25 and screw sleeve 21 adopt threaded connection, when screw sleeve 21 is rotatory and move down, screw sleeve 21 applys the decurrent pressure for piston depression bar 29, and the piston 28 in the pneumatic cylinder 27 pushes down and produces pressure this moment.

Pneumatic cylinder 27 with be equipped with medium runner 31 between the sample groove 35, medium runner 31 one end movable mounting has the shrink to expand set 32, grind and throw pressure disk 23 top and be equipped with draw-in groove 26, movable mounting has sample briquetting 33 in the sample groove 35, and when piston 28 pushed down and produced pressure, hydraulic medium 30 flow direction medium runner 31 has utilized the hydraulic pressure principle, makes the shrink expand set 32 inflation extrude sample briquetting 33 to make the metallography grind and throw sample 36 and fasten in sample groove 35, be equipped with a plurality of bearing diagonal poles 24 between pillar 25 and the grinding and throwing pressure disk 23, bearing diagonal pole 24 is located between the adjacent sample groove 35.

Example two

In order to adjust the position of the grinding and polishing pressure plate conveniently, as shown in fig. 1, fig. 5 and fig. 6, a base 1 is provided with a positioning hole for installing an auxiliary device on a metallographic specimen grinding and polishing machine, the auxiliary device is directly installed on the grinding and polishing machine without changing the original metallographic grinding and polishing machine, a support frame 4 is rotatably connected on the base 1, the support frame 4 and the base 1 are in clearance fit, a rotating shaft 3 is installed at the bottom end of the support frame 4, the rotating shaft 3 is positioned in the base 1, the rotating shaft 3 is rotatably connected with the base 1, a butterfly bolt one 2 is in threaded connection on the base 1, the axis of the butterfly bolt one 2 is perpendicular to the axis of the rotating shaft 3, the rotating shaft 3 is fixed by screwing the butterfly bolt one 2, the rotating shaft 3 is fixed by rotating the butterfly bolt one 2, and the position of the support frame 4 is fixed, so that the structure can be disassembled arbitrarily, the grinding and polishing device is free to use, and the quality of a grinding and polishing sample cannot be influenced by the addition of the parts.

Be equipped with gear shaft locating hole 401 on support frame 4, installation movable mounting has gear shaft 7 in gear shaft locating hole 401, the cover is equipped with gear 6 on the gear shaft 7, be equipped with gear hole 402 on support frame 4, gear hole 402 cross-section is the same with the gear 6 cross-section, 4 one end fixed mounting of support frame has slider shell 10, slider shell 10 one end is the opening, gear hole 402 passes slider shell 10 with slider shell 10's open end communicates with each other, and the meshing of the gear 6 of being convenient for and rack 9 meshes through rotating handle 5 and meshes the transmission fast, and the transmission is steady swift, and movable slide 13 also steadily slides in spout 11 under the drive of rack 9, through driving the 19 movements of loose axle, can adjust the height of throwing mill pressure dish 23 in a flexible way.

Handles 5 are fixedly arranged at two ends of the gear shaft 7, the gear shaft 7 rotates in the gear shaft positioning hole 401 by manually operating the handles 5, and a hole nut 8 is further arranged on the gear shaft 7, and the hole nut 8 is positioned between the handles 5 and the support frame 4.

The sliding shell 10 is symmetrically provided with sliding grooves 11, the other end of the sliding shell 10 is movably provided with a transverse support 14, one side of the transverse support 14 is provided with a butterfly bolt II 17, one side of the transverse support 14 is provided with a movable sliding block 13, two ends of the movable sliding block 13 are provided with convex grooves 12, the convex grooves 12 are located in the sliding grooves 11, the convex grooves 12 are connected with the sliding grooves 11 in a sliding mode, one side of the movable sliding block 13 is provided with a rack 9, and the rack 9 is meshed with the gear 6.

EXAMPLE III

In order to ensure the accuracy of the upper and lower positions of the polishing platen 23, as shown in fig. 1, 7 and 8, a positioning shaft hole 15 and an annular protrusion 1401 are arranged on the transverse support 14, the annular protrusion 1401 is coaxial with the positioning shaft hole 15, the annular protrusion 1401 is located below the positioning shaft hole 15, an annular groove 16 is arranged on the outer wall of the annular protrusion 1401, a fine adjustment screw sleeve 18 is sleeved on the annular protrusion 1401, an annular convex groove and a thread matched with the annular groove 16 are arranged on the fine adjustment screw sleeve 18, a movable shaft 19 is arranged in the positioning shaft hole 15, the movable shaft 19, the positioning shaft hole 15 and the fine adjustment screw sleeve 18 are in threaded connection, a clamping groove structure is arranged at the bottom end of the movable shaft 19, the clamping groove structure of the movable shaft 19 is matched and connected with the clamping groove 26 through the movable sleeve 20, the fine adjustment screw sleeve 18 matched with the positioning shaft hole 15 is in threaded connection for fine adjustment, so that the position of the polishing platen 23 can be adjusted in a small degree, therefore, the pressure between the sample and the grinding and polishing disc can be accurately controlled, the height of the grinding and polishing pressure disc 23 can be fixed by the butterfly bolt II 17 on the positioning shaft hole 15, the stability of the grinding and polishing pressure disc 23 and the sample in the grinding and polishing process is ensured, and compared with the manual grinding and polishing and the automatic grinding and polishing machine, the auxiliary device has the advantages that the pressure control is more stable and accurate, and the grinding and polishing effect of the sample can be better ensured.

Based on the multistage speed regulating device of the three embodiments, the invention also provides a use method of the auxiliary device for the metallographic specimen grinding and polishing machine, which comprises the following steps:

the auxiliary device is arranged on a metallographic specimen grinding and polishing machine through a positioning hole on a base 1, a rotating shaft 3 at the bottom end of a supporting frame 4 is rotated, a grinding and polishing pressure plate 23 is adjusted to a proper position corresponding to the grinding and polishing machine, then the position of a transmission shaft 3 is fixed through screwing a butterfly bolt 2, the position of the grinding and polishing pressure plate 23 relative to the grinding and polishing machine is indirectly fixed, then a metallographic grinding and polishing specimen 36 is placed in a specimen groove 35 on the grinding and polishing pressure plate 23, a screw sleeve 21 rotates and presses a piston press rod 29 downwards, the piston press rod 29 enables a piston 28 to move downwards, a hydraulic medium 30 in a hydraulic cylinder 27 flows into a hydraulic medium flow passage 31 uniformly designed in the grinding and polishing pressure plate 23 after being pressed, a contraction expansion sleeve 32 at the rear end of a specimen pressing block 33 is further pressed and expanded to push the specimen pressing block 33 to move forwards, meanwhile, each grinding and polishing specimen on the grinding and polishing pressure plate 23 is extruded, each metallographic grinding and polishing specimen is tightly fixed in the specimen groove 35 on the grinding and polishing pressure plate 23, then, the gear shaft 7 is driven to rotate by rotating the handle 5, the gear 6 on the gear shaft 7 is in meshing transmission with the rack 9, so that the movable sliding block 13 stably ascends or descends in the sliding groove 11 of the sliding block shell 10, the movable shaft 19 and the polishing pressing disc 23 in the positioning shaft hole 15 on the transverse support 14 connected with the movable sliding block 13 are further driven to rapidly move up and down, the hole nut 8 is screwed down by adjusting the polishing pressing disc 23 to a proper height, so that the gear 6, the rack 9, the movable sliding block 13, the movable shaft 19 and the polishing pressing disc 23 are kept in proper positions, finally, the fine adjustment screw sleeve 18 is rotated, the fine adjustment screw sleeve 18 and the movable shaft 19 are in micro-adjustment through thread transmission, after the metallographic polishing sample and the polishing pressing disc 23 are adjusted to a proper position, the metallographic polishing sample can be automatically polished after the butterfly bolt 17 is screwed, when the metallographic polishing sample polishing condition needs to be checked, the handle 5 is operated to enable the polishing pressing disc 23 to be improved by a certain height, and then the metallographic polishing sample is fixed And (3) screwing the screw sleeve 21 loose, pushing the piston 28 to move upwards by a hydraulic medium under the action of pressure, continuously reducing the pressure in the hydraulic cylinder 27, naturally contracting the contracting expansion sleeve 32, reducing the pressure of the metallographic grinding and polishing sample by the sample pressing block 33, directly taking out the metallographic grinding and polishing sample for observation, and directly taking out the metallographic grinding and polishing sample without sampling and observing after the grinding and polishing disc stops rotating.

Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a metallographic specimen grinds throws machine auxiliary device which characterized in that includes:

the device comprises a base (1), wherein a positioning hole for installing an auxiliary device on a metallographic sample grinding and polishing machine is formed in the base (1), a support frame (4) is connected to the base (1) in a rotating mode, a sliding block shell (10) is fixedly installed at one end of the support frame (4), a transverse support (14) is movably installed at the other end of the sliding block shell (10), and a butterfly bolt II (17) is installed on one side of the transverse support (14);

grind and polish pressure disk (23), install pillar (25) on it, be equipped with pneumatic cylinder (27) in pillar (25), pneumatic cylinder (27) intussuseption is filled with hydraulic medium (30), grinds and polish evenly to have laid a plurality of sample grooves (35) and sample groove (34) on pressure disk (23), sample groove (35) are located sample groove (34) directly over, and metallographic phase grinds and polishes sample (36) and is located in sample groove (35), pneumatic cylinder (27) with be equipped with medium runner (31) between sample groove (35), medium runner (31) one end movable mounting has shrink expanding sleeve (32), it is equipped with draw-in groove (26) to grind and polish pressure disk (23) top.

2. The auxiliary device for the metallographic specimen grinding and polishing machine according to claim 1, wherein a rotating shaft (3) is installed at the bottom end of the support frame (4), the rotating shaft (3) is located in the base (1), the rotating shaft (3) is rotatably connected with the base (1), a butterfly bolt I (2) is connected to the base (1) in a threaded mode, the axis of the butterfly bolt I (2) is perpendicular to the axis of the rotating shaft (3), and the rotating shaft (3) is fixed by screwing the butterfly bolt I (2).

3. The auxiliary device for the metallographic specimen grinding and polishing machine according to claim 2, wherein a gear shaft positioning hole (401) is formed in the support frame (4), a gear shaft (7) is movably mounted in the gear shaft positioning hole (401), a gear (6) is sleeved on the gear shaft (7), a gear hole (402) is formed in the support frame (4), the cross section of the gear hole (402) is identical to that of the gear (6), one end of the slider shell (10) is an opening, the gear hole (402) penetrates through the slider shell (10) and is communicated with the open end of the slider shell (10), and sliding grooves (11) are symmetrically formed in the slider shell (10).

4. The auxiliary device for the metallographic specimen grinding and polishing machine according to claim 3, wherein a movable sliding block (13) is mounted on one side of the transverse support (14), convex grooves (12) are formed in two ends of the movable sliding block (13), the convex grooves (12) are located in the sliding grooves (11), the convex grooves (12) are in sliding connection with the sliding grooves (11), a rack (9) is mounted on one side of the movable sliding block (13), and the rack (9) is meshed with the gear (6).

5. The auxiliary device for the metallographic sample polishing and grinding machine is characterized in that handles (5) are fixedly mounted at two ends of a gear shaft (7), the gear shaft (7) can rotate in a gear shaft positioning hole (401) by manually operating the handles (5), a hole nut (8) is further mounted on the gear shaft (7), and the hole nut (8) is located between the handle (5) and a support frame (4).

6. The auxiliary device for the metallographic specimen grinding and polishing machine according to claim 1, wherein a positioning shaft hole (15) and an annular boss (1401) are arranged on the transverse support (14), the annular boss (1401) is coaxial with the positioning shaft hole (15), the annular boss (1401) is located below the positioning shaft hole (15), an annular groove (16) is formed in the outer wall of the annular boss (1401), a fine-adjustment screw sleeve (18) is sleeved on the annular boss (1401), an annular convex groove and a thread matched with the annular groove (16) are formed in the fine-adjustment screw sleeve (18), and a movable shaft (19) is installed in the positioning shaft hole (15).

7. The auxiliary device for the metallographic specimen grinding and polishing machine according to claim 6, wherein the movable shaft (19) is in threaded connection with the positioning shaft hole (15) and the fine adjustment screw sleeve (18), and a clamping groove structure is arranged at the bottom end of the movable shaft (19).

8. The auxiliary device for the metallographic specimen polisher according to claim 7, wherein the clamping groove structure of the movable shaft (19) is connected with the clamping groove (26) in a matched manner through a movable sleeve (20).

9. The auxiliary device for the metallographic specimen grinding and polishing machine according to claim 1, wherein the pillar (25) is connected with a screw sleeve (21) in a threaded manner, a piston pressing rod (29) is movably mounted in the pillar (25), butterfly bolts (22) are connected to two ends of the piston pressing rod (29), the screw sleeve (21) is located above the piston pressing rod (29), a through groove (37) is formed in the pillar (25), the piston pressing rod (29) moves up and down along the through groove (37), a piston (28) is movably mounted in the hydraulic cylinder (27), and the top end of the piston (28) penetrates through the hydraulic cylinder (27) and is connected with the piston pressing rod (29).

10. The auxiliary device for the metallographic sample polishing machine according to any one of claims 1 to 9, wherein a sample pressing block (33) is movably mounted in the sample groove (35), the cross section of the sample groove (35) is circular, a plurality of inclined support rods (24) are arranged between the pillars (25) and the polishing platen (23), and the inclined support rods (24) are located between adjacent sampling grooves (35).