Flat grinding device capable of clamping multiple ceramic parts at one time

By designing multiple positioning molds and clamping components, the problems of low efficiency and poor adaptability of existing ceramic parts grinding devices are solved, enabling efficient clamping and cooling of multiple ceramic parts, thus improving processing efficiency and quality.

CN224223457UActive Publication Date: 2026-05-12XINXIANG DACHANG PRECISION CERAMIC TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
XINXIANG DACHANG PRECISION CERAMIC TECH
Filing Date
2025-07-23
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

Existing ceramic parts grinding devices are inefficient, cannot clamp multiple ceramic parts at once, cannot adapt to ceramic parts of different sizes and shapes, and are prone to cracking or deformation of parts due to excessive temperature during grinding.

Method used

A flat grinding device comprising multiple sets of positioning molds and clamping components was designed. The positioning molds and clamping components enable the simultaneous clamping of multiple ceramic parts, and the cooling treatment is achieved by spraying coolant through a conveying pipe and a nozzle.

Benefits of technology

It enables efficient clamping and grinding of multiple ceramic parts, adapting to the needs of ceramic parts of different sizes and shapes, while preventing damage to parts caused by excessive temperature, thus improving processing efficiency and quality.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a flat grinding device capable of clamping multiple ceramic parts at a time, and relates to the technical field of part machining. The device comprises a base, a conveying pipe, a positioning die and a clamping assembly, the conveying pipe and the clamping assembly are located above the base. A square groove is formed in the top end of the base, a positioning mold is sleeved with the square groove, a clamping assembly is further fixedly connected to the top end of the base, a grinding piece is arranged above the clamping assembly, a conveying pipe is arranged above the base, and spray heads are arranged on the lower portion of the peripheral side of the conveying pipe. According to the plane grinding device for the ceramic parts, the multiple sets of positioning dies, the multiple clamping assemblies, the conveying pipe and the spray head are arranged, so that the problem that an existing plane grinding device for the ceramic parts cannot clamp multiple ceramic parts at a time is solved, and the problem that ceramic parts of different sizes and shapes cannot be clamped is solved; and the problem that the ceramic part cracks or deforms due to the fact that the surface temperature of the ceramic part is too high during flat grinding is solved.
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Description

Technical Field

[0001] This utility model belongs to the field of parts processing technology, and in particular relates to a flat grinding device for clamping multiple ceramic parts at one time. Background Technology

[0002] Ceramic parts, due to their superior performance, play a vital role in aerospace, semiconductor manufacturing, and other industrial fields. Before using ceramic parts, they need to undergo surface grinding to improve surface precision, repair surface damage, optimize performance, and meet precision machining requirements. However, currently available surface grinding devices for ceramic parts still have the following problems during use:

[0003] Currently, the mainstream surface grinding devices for ceramic parts on the market generally work by using a fixing device to fix a ceramic part, and then using a grinding disc to grind it. After grinding, the next ceramic part is replaced and ground. This working method of clamping and grinding one ceramic part at a time is very inefficient and not conducive to the mass grinding of ceramic parts.

[0004] When performing surface grinding on ceramic parts of different models, due to the different sizes and shapes of the parts, the surface grinding device using the same ceramic parts may not be able to stably clamp the ceramic parts, resulting in the surface grinding work not being able to proceed smoothly. Only by replacing it with a surface grinding device that is compatible with it can the surface grinding be performed, which increases the cost.

[0005] 3. During the grinding process of ceramic parts, the friction between the grinding disc and the ceramic parts causes them to heat up, which may cause cracks or deformation in the ceramic parts, affecting the grinding quality and reducing the precision of the ceramic parts.

[0006] To address these issues, we have provided a surface grinding device that can clamp multiple ceramic parts at once. Utility Model Content

[0007] The purpose of this utility model is to provide a flat grinding device for clamping multiple ceramic parts at one time. By setting up multiple sets of positioning molds, multiple clamping components, conveying pipes and nozzles, it solves the problems of existing flat grinding devices for ceramic parts that cannot clamp multiple ceramic parts at one time, cannot clamp ceramic parts of different sizes and shapes, and have excessively high surface temperatures of ceramic parts during flat grinding.

[0008] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0009] This utility model is a surface grinding device for clamping multiple ceramic parts at one time, including a base, a conveying pipe, a clamping assembly and a positioning mold; the conveying pipe and the clamping assembly are located above the base;

[0010] The top of the base has five sets of square slots arranged in a linear array. Each set of square slots has two slots. Each square slot has a positioning mold fitted inside it. The positioning mold is fixedly connected to the base by bolts. A clamping component is fixedly connected to the top of the base between the two square slots in each set. A grinding disc is provided above each clamping component.

[0011] When performing surface grinding on ceramic parts, the ceramic parts are placed inside the positioning mold in the square groove. The positioning mold positions and fixes the lower part of the ceramic parts, and the clamping assembly is used to fix the upper part of the ceramic parts. Then, the grinding disc is used to perform surface grinding on the ceramic parts. When it is necessary to perform surface grinding on ceramic parts of different sizes and shapes, simply replace the corresponding matching positioning mold and re-clamp the parts using the clamping assembly. Multiple positioning molds and multiple clamping assemblies can be used to clamp multiple ceramic parts for surface grinding simultaneously.

[0012] The clamping assembly includes a fixed block fixed to the top of the base and a rotating rod rotatably connected to the upper part of the fixed block. A limiting groove is provided on the upper part of the fixed block. Two moving blocks are movably connected to the rotating rod inside the limiting groove. Clamping components are fixedly connected to both ends of the two moving blocks on the side that are close to each other.

[0013] When clamping ceramic parts, move the two moving blocks in the limiting groove toward each other until the two clamping parts can stably clamp the ceramic parts; after the ceramic parts are flat ground, move the two moving blocks away from each other to release the ceramic parts.

[0014] Furthermore, the rotating rod located inside the limiting groove has two opposite threads on its periphery, and each threaded segment on the rotating rod is threadedly connected to a moving block. A crank is fixedly connected to the end of the rotating rod away from the vertical plate.

[0015] Turn the crank in the opposite direction to make the rotating rod rotate in the opposite direction. Due to the opposite threads at both ends, the two moving blocks move in opposite directions. Then, put the ceramic part into the positioning mold. Turn the crank in the forward direction to make the rotating rod rotate in the forward direction. The two moving blocks move in opposite directions until the clamping part stably clamps the upper part of the ceramic part, and the clamping work of the ceramic part is completed.

[0016] Furthermore, a vertical plate is fixedly connected to the top of one side of the base. Five connectors are fixedly connected in a linear array to the lower middle part of the vertical plate near the base. The ends of the five connectors away from the vertical plate are fixedly connected to a conveying pipe. Five sets of nozzles are arranged in a linear array on the lower periphery of the conveying pipe near the clamping assembly. The nozzles are fixedly connected to the conveying pipe in a through manner. The end of the nozzle away from the conveying pipe points to the positioning mold that is close to it.

[0017] The delivery pipe is connected to a coolant storage device. The coolant storage device contains coolant. When the ceramic parts are being ground, the coolant enters the delivery pipe and is sprayed out from the nozzle onto the ceramic parts to cool them down and prevent them from cracking or deforming due to excessive temperature.

[0018] Furthermore, a top plate is fixedly connected to the top of the vertical plate, the top plate is located above the base, a cylinder is fixedly connected to the center of the top of the top plate, a movable plate is provided between the top plate and the base, and the piston rod of the cylinder's telescopic end passes downward through the top plate and is fixedly connected to the movable plate.

[0019] Furthermore, two limiting rods are fixedly connected to the top of the movable plate. The two limiting rods are located on both sides of the piston rod, and the top ends of the two limiting rods are both through and extend out of the top plate.

[0020] Furthermore, each of the five movable plates located above the clamping assemblies is rotatably connected to a rotating shaft at its bottom end. Each rotating shaft is fixedly connected to a pulley on its periphery. A transmission belt is connected between the pulleys on every two adjacent rotating shafts. A grinding disc is fixedly connected to the bottom end of each rotating shaft.

[0021] When the cylinder is activated, the piston rod at the cylinder's extension and retraction end extends and retracts, which drives the moving plate to move up and down, thereby moving the grinding disc. The limit rod limits the movement of the moving plate, allowing it to move up and down stably. When clamping ceramic parts, the grinding disc is moved up; after clamping, the grinding disc is moved down to the surface of the ceramic part, and the grinding disc rotates to perform surface grinding on the ceramic part.

[0022] Furthermore, a motor is fixedly connected to the top of the movable plate above one of the rotating shafts, and the output end of the motor passes through the movable plate and is connected to the rotating shaft below it in a transmission manner.

[0023] Start the motor, and the motor output will rotate, which will drive the shaft to rotate. The rotation of the shaft will drive the pulleys fixedly connected to the side of the shaft to rotate. The pulleys will drive the other pulleys to rotate together through the transmission belt, which in turn will drive all the shafts and grinding discs to rotate, and perform surface grinding on all the clamped ceramic parts.

[0024] This utility model has the following beneficial effects:

[0025] This invention solves the problem of not being able to clamp multiple ceramic parts at once by setting up multiple sets of positioning molds and multiple clamping components; multiple sets of positioning molds and multiple clamping components can clamp multiple ceramic parts, and then perform surface grinding on the ceramic parts, thus achieving the purpose of clamping multiple ceramic parts for surface grinding.

[0026] This invention solves the problem of being unable to clamp ceramic parts of different sizes and shapes by setting a positioning mold and a clamping assembly. When it is necessary to clamp ceramic parts of different sizes and shapes, simply replace the corresponding positioning mold to position the lower part of the ceramic part. At the same time, due to the clamping parts on the clamping assembly, ceramic parts of different shapes can be clamped, thus achieving the purpose of clamping ceramic parts of different sizes and shapes.

[0027] This invention solves the problem of excessively high surface temperature of ceramic parts during flat grinding by setting up a conveying pipe and a nozzle. The conveying pipe is connected to a coolant storage device. During flat grinding, the coolant flows through the conveying pipe and is then sprayed out from the nozzle onto the surface of the ceramic parts to cool them down, thereby reducing the surface temperature of the ceramic parts and preventing cracks or deformation.

[0028] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of a surface grinding device for clamping multiple ceramic parts at once.

[0031] Figure 2 This is a front view schematic diagram of a surface grinding device that can clamp multiple ceramic parts at once.

[0032] Figure 3 This is a schematic diagram of the connection structure of the base, vertical plate, top plate and conveying pipe.

[0033] Figure 4 This is a schematic diagram of the positioning module.

[0034] Figure 5 This is a schematic diagram of the clamping assembly.

[0035] Figure 6 This is a schematic diagram of the connection structure between the rotating shaft and the grinding disc.

[0036] The attached diagram lists the components represented by each number as follows:

[0037] 1. Base; 101. Vertical plate; 1011. Connector; 102. Top plate; 103. Cylinder; 1031. Piston rod; 104. Moving plate; 1041. Limiting rod; 105. Square groove; 2. Conveying pipe; 201. Nozzle; 3. Rotating shaft; 301. Pulley; 302. Transmission belt; 303. Grinding disc; 304. Motor; 4. Clamping assembly; 401. Fixing block; 4011. Limiting groove; 402. Rotating rod; 4021. Handle; 403. Moving block; 404. Clamping component; 5. Positioning mold. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. Specific Implementation Example 1

[0039] Please see Figure 1-4 This utility model is a flat grinding device for clamping multiple ceramic parts at one time, including a base 1, a conveying pipe 2, a clamping component 4 and a positioning mold 5; the top of the base 1 has five sets of square slots 105 arranged in a linear array, each set of square slots 105 has two slots, and each square slot 105 is fitted with a positioning mold 5. The positioning mold 5 is fixedly connected to the base 1 by bolts. The top of the base 1 between each set of two square slots 105 is fixedly connected with a clamping component 4, and a grinding disc 303 is provided above each clamping component 4.

[0040] The base 1 provides support for the entire surface grinding device for ceramic parts, enabling the surface grinding of ceramic parts to be carried out normally and stably. When performing surface grinding of ceramic parts, the ceramic parts are placed inside the positioning mold 5 in the square groove 105. The positioning mold 5 positions and fixes the lower part of the ceramic parts. Then, the clamping assembly 4 is used to fix the upper part of the ceramic parts, and the grinding disc 303 is used to perform surface grinding of the ceramic parts. When it is necessary to perform surface grinding of ceramic parts of different sizes and shapes, it is only necessary to replace the positioning mold 5 to fix the lower part of the ceramic parts and re-use the clamping assembly 4 to clamp them. Ceramic parts of different sizes and shapes can be clamped. The setting of multiple positioning molds 5 and multiple clamping assemblies 4 can clamp multiple ceramic parts for surface grinding at the same time.

[0041] The clamping assembly 4 includes a fixed block 401 fixed to the top of the base 1 and a rotating rod 402 rotatably connected to the upper part of the fixed block 401. A limiting groove 4011 is provided on the upper part of the fixed block 401. Two moving blocks 403 are movably connected to the rotating rod 402 inside the limiting groove 4011. Clamping members 404 are fixedly connected to both ends of the side of the two moving blocks 403 that are close to each other.

[0042] Due to the setting of the limiting groove 4011, the fixed block 401 can only move along the limiting groove 4011. When clamping ceramic parts of different sizes and shapes, first move the two moving blocks 403 in a direction away from each other so that the two clamping parts 404 will not block the square groove 105. Then, place the positioning mold 5 corresponding to the part and put the part into the positioning mold 5. Finally, move the two moving blocks 403 in a direction closer to each other until the clamping parts 404 can stably clamp the ceramic parts, and the clamping work of the ceramic parts can be completed.

[0043] Among them, such as Figure 2 , Figure 5 As shown, the rotating rod 402 located inside the limiting groove 4011 has two opposite threads on its periphery, and each threaded segment on the rotating rod 402 is threadedly connected to a moving block 403. A crank handle 4021 is fixedly connected to the end of the rotating rod 402 away from the vertical plate 101.

[0044] Before processing the ceramic parts, the handle 4021 is turned in reverse, causing the rotating rod 402 to rotate in the opposite direction. Due to the opposite threads at both ends, the two moving blocks 403 will move in opposite directions. The positioning mold 5 is placed into the gap between the two moving blocks 403. Then, the ceramic parts are placed into the positioning mold 5. The handle 4021 is turned in the forward direction, causing the rotating rod 402 to rotate in the forward direction. The two moving blocks 403 move in opposite directions until the clamping member 404 stably clamps the upper part of the ceramic parts, thus completing the clamping of the ceramic parts. The clamping member 404 allows the clamping assembly 4 to clamp ceramic parts of different sizes and shapes.

[0045] Among them, such as Figure 1-3 As shown, a top plate 102 is fixedly connected to the top of the vertical plate 101. The top plate 102 is located above the base 1. A cylinder 103 is fixedly connected to the center of the top of the top of the top plate 102. A movable plate 104 is provided between the top plate 102 and the base 1. The piston rod 1031 of the telescopic end of the cylinder 103 passes through the top plate 102 downward and is fixedly connected to the movable plate 104. When the cylinder 103 is activated, the piston rod 1031 of the telescopic end of the cylinder 103 extends and retracts, which drives the movable plate 104 to move up and down.

[0046] Among them, such as Figure 1-3As shown, two limiting rods 1041 are fixedly connected to the top of the movable plate 104. The two limiting rods 1041 are located on both sides of the piston rod 1031, and the top ends of the two limiting rods 1041 are through and extend out of the top plate 102. The setting of the limiting rods 1041 makes the movement of the movable plate 104 in the vertical direction more stable.

[0047] Among them, such as Figure 1 , Figure 2 , Figure 6 As shown, the bottom of the movable plate 104 located above the five clamping components 4 is rotatably connected to a rotating shaft 3. Each rotating shaft 3 is fixedly connected to a pulley 301 on its periphery. A transmission belt 302 is connected between the pulleys 301 on each two adjacent rotating shafts 3. A grinding disc 303 is fixedly connected to the bottom of the rotating shaft 3.

[0048] As long as one rotating shaft 3 rotates, it can drive the pulley 301 fixedly connected to its periphery to rotate, and through the transmission belt 302, drive the other pulleys 301 to rotate together, thereby driving the other rotating shafts 3 to rotate, and at the same time driving the grinding disc 303 to rotate, to perform surface grinding on the ceramic parts; when the cylinder 103 is started, the piston rod 1031 at the telescopic end of the cylinder 103 can extend and retract, thereby driving the moving plate 104 to move up and down, thereby driving the grinding disc 303 to move up and down. When clamping the ceramic parts, the grinding disc 303 is moved up; after clamping is completed, the grinding disc 303 is moved down to the surface of the ceramic parts, and the grinding disc 303 rotates to perform surface grinding on the ceramic parts.

[0049] Among them, such as Figure 1 , Figure 2 As shown, a motor 304 is fixedly connected to the top of a movable plate 104 above one of the rotating shafts 3. The output end of the motor 304 passes through the movable plate 104 and is connected to the rotating shaft 3 below it.

[0050] Start the motor 304. The output end of the motor 304 rotates, which drives the rotating shaft 3 to rotate. Under the action of the pulley 301 and the transmission belt 302, all the rotating shafts 3 and the grinding disc 303 rotate, and perform surface grinding on all the clamped ceramic parts.

[0051] The working principle of this embodiment is as follows: When clamping ceramic parts, cylinder 103 is activated, and the telescopic rod of cylinder 103 pulls the moving plate 104 upward, and the grinding disc 303 also moves upward. Then, the handle 4021 is rotated in the reverse direction, causing the two moving blocks 403 to move away from each other. The positioning mold 5 corresponding to the ceramic part is placed into the gap between the two moving blocks 403. Then, the ceramic part is placed into the positioning mold 5. The handle 4021 is rotated in the forward direction, and the two moving blocks 403 move towards each other until the clamping member 404 stably clamps the upper part of the ceramic part, thus completing the clamping of the ceramic part. Then, cylinder 103 is activated again, and the telescopic rod of cylinder 103 pushes the moving plate 104 downward, and the grinding disc 303 also moves downward, moving to the surface of the ceramic part. When the cylinder 103 is closed, the motor 304 is started. The output end of the motor 304 rotates, driving the rotating shaft 3 to rotate. Under the action of the pulley 301 and the transmission belt 302, all the rotating shafts 3 and the grinding disc 303 rotate together to grind the clamped ceramic parts. After grinding, the motor 304 is closed, the cylinder 103 is started, and the grinding disc 303 is moved upward to remove the ground ceramic parts. When it is necessary to perform surface grinding on ceramic parts of different sizes and shapes, it is only necessary to replace the different positioning molds 5 to fix the lower part of the ceramic parts and re-clamp them with the clamping components 4. At the same time, the setting of multiple positioning molds 5 and multiple clamping components 4 can clamp multiple ceramic parts for surface grinding at the same time, which improves the working efficiency of surface grinding. Specific Implementation Example 2

[0052] Please see Figure 1-3 Based on the first specific embodiment, the conveying pipe 2 is located above the base 1. A vertical plate 101 is fixedly connected to the top of one side of the base 1. Five connectors 1011 are fixedly connected in a linear array on the lower middle part of the side of the vertical plate 101 near the base 1. The end of the five connectors 1011 away from the vertical plate 101 is fixedly connected to the conveying pipe 2. Five sets of nozzles 201 are arranged in a linear array on the lower part of the periphery of the conveying pipe 2 near the clamping component 4. The nozzles 201 are fixedly connected to the conveying pipe 2 in a through manner. The end of the nozzle 201 away from the conveying pipe 2 points to the positioning mold 5 that is close to it.

[0053] The working principle of this embodiment is as follows: the conveying pipe 2 is connected to a coolant storage device, which stores coolant (such as water or other cooling medium). When the ceramic parts are being ground, the coolant enters the conveying pipe 2 and is sprayed out from the nozzle 201. Since the end of the nozzle 201 away from the conveying pipe 2 points to the positioning mold 5 that is close to it, the coolant will be sprayed onto the surface of the ceramic parts to cool them down and prevent the ceramic parts from cracking or deforming due to friction with the grinding disc 303 during the grinding process.

[0054] The above are merely preferred embodiments of the present utility model and do not limit the present utility model. Any modifications, equivalent substitutions, or improvements made to the technical solutions described in the foregoing embodiments, or to some of the technical features, shall fall within the protection scope of the present utility model.

Claims

1. A surface grinding device for clamping multiple ceramic parts at once, comprising a base (1), a conveying pipe (2), a clamping assembly (4), and a positioning mold (5); characterized in that: The delivery pipe (2) and the clamping assembly (4) are located above the base (1); The base (1) has five sets of square slots (105) arranged in a linear array at its top. Each set of square slots (105) has two slots. Each square slot (105) is fitted with a positioning mold (5). The positioning mold (5) is fixedly connected to the base (1) by bolts. A clamping assembly (4) is fixedly connected to the top of the base (1) between each set of two square slots (105). A grinding disc (303) is provided above each clamping assembly (4). The clamping assembly (4) includes a fixed block (401) fixed to the top of the base (1) and a rotating rod (402) rotatably connected to the upper part of the fixed block (401). A limiting groove (4011) is provided on the upper part of the fixed block (401). Two moving blocks (403) are movably connected to the rotating rod (402) inside the limiting groove (4011). Clamping members (404) are fixedly connected to both ends of the two moving blocks (403) on the side that are close to each other.

2. The surface grinding device for clamping multiple ceramic parts at once according to claim 1, characterized in that: The rotating rod (402) located inside the limiting groove (4011) has two opposite threads on its periphery, and each thread segment on the rotating rod (402) is threadedly connected to a moving block (403). A crank (4021) is fixedly connected to the end of the rotating rod (402) away from the vertical plate (101).

3. The surface grinding device for clamping multiple ceramic parts at once according to claim 2, characterized in that: A vertical plate (101) is fixedly connected to the top of one side of the base (1). Five connectors (1011) are fixedly connected in a linear array on the lower middle part of the side of the vertical plate (1) near the base (1). The ends of the five connectors (1011) away from the vertical plate (101) are fixedly connected to a conveying pipe (2). Five sets of nozzles (201) are arranged in a linear array on the lower periphery of the conveying pipe (2) near the clamping assembly (4). The nozzles (201) are fixedly connected to the conveying pipe (2) in a through-type manner. The end of the nozzle (201) away from the conveying pipe (2) points to the positioning mold (5) that is close to it.

4. The surface grinding device for clamping multiple ceramic parts at once according to claim 3, characterized in that: A top plate (102) is fixedly connected to the top of the vertical plate (101). The top plate (102) is located above the base (1). A cylinder (103) is fixedly connected to the center of the top of the top of the top plate (102). A movable plate (104) is provided between the top plate (102) and the base (1). The piston rod (1031) of the telescopic end of the cylinder (103) passes through the top plate (102) downward and is fixedly connected to the movable plate (104).

5. The surface grinding device for clamping multiple ceramic parts at once according to claim 4, characterized in that: The top of the movable plate (104) is fixedly connected to two limiting rods (1041). The two limiting rods (1041) are located on both sides of the piston rod (1031), and the tops of the two limiting rods (1041) are both through and extend out of the top plate (102).

6. The surface grinding device for clamping multiple ceramic parts at once according to claim 4, characterized in that: The bottom of each movable plate (104) located above the five clamping components (4) is rotatably connected to a rotating shaft (3). Each rotating shaft (3) is fixedly connected to a pulley (301) on its periphery. A transmission belt (302) is connected between the pulleys (301) on each two adjacent rotating shafts (3). A grinding disc (303) is fixedly connected to the bottom of the rotating shaft (3).

7. The surface grinding device for clamping multiple ceramic parts at once according to claim 6, characterized in that: A motor (304) is fixedly connected to the top of a movable plate (104) above one of the rotating shafts (3). The output end of the motor (304) passes through the movable plate (104) and is connected to the rotating shaft (3) below it.