Large-size glass substrate droop jig of gluing machine

Abstract

The invention provides a gluing machine large-size glass substrate droop jig which comprises a supporting jig, an expansion block is arranged at the bottom end of the supporting jig, a bottom jig is arranged at the bottom end of the expansion block, the expansion block is arranged between the supporting jig and the bottom jig, a positioning hole is formed in the supporting jig, and the bottom jig is arranged in the positioning hole. Fixing bolts are embedded into the positioning holes, the fixing bolts are used for fixing the supporting jig and the bottom jig on the spin coater, and rubber rings used for wrapping the top ends of the fixing bolts are arranged at the upper edge openings of the positioning holes. The supporting jig is used for supporting the glass substrate, the backing ring and the suction piece in the supporting assembly are matched to jointly support the lower surface of the glass substrate, and the problem that the thin glass substrate droops in the dispensing process is effectively solved. And in the aspect of adsorption fixation, the adsorption sheet is sunken downwards to form negative pressure to adsorb the glass substrate, so that the adsorption stability is improved, edge breakage or fragmentation of the glass substrate caused by adsorption force during taking is prevented, and the operation is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of sagging jigs, and in particular to a sagging jig for a large-size glass substrate of a glue coating machine. Background Art

[0002] In modern industrial production, large-size glass substrates are increasingly used. The gluing process of glass substrates is a crucial link, and the quality of the gluing directly affects the performance and quality of the final product. During the gluing process, large-size glass substrates are prone to sagging and deformation due to their own gravity. This sagging and deformation will seriously affect the uniformity and accuracy of the gluing, resulting in defects such as inconsistent gluing thickness and deviation in the gluing position, thereby reducing the yield and quality of the product. In order to solve the problem of sagging of glass substrates, sagging jigs came into being.

[0003] In contrast, the Chinese patent application with publication number CN1511973A discloses a preheating reaction chamber, which includes a plurality of slot structures for carrying glass substrates for preheating process, and the slot structure is composed of a bottom plate, a cover plate, two side plates, a back plate and a front plate, wherein at least one elongated support block is provided on the upper surface of the bottom plate, and at least two support blocks are provided on the inner surfaces of the two side plates. The elongated support block and the support block can support the glass substrate thereon, so that there is a large contact surface between the elongated support block and the glass substrate, so as to provide a large friction resistance, and effectively prevent the glass substrate from sliding due to external force.

[0004] Based on the analysis of the above-mentioned comparative documents and existing sagging jigs, there are many deficiencies in actual use. Many jigs use a simple support structure and rely solely on the friction with the surface of the glass substrate to fix the substrate. However, this method has great limitations. On the one hand, due to the smooth surface of the glass substrate and limited friction, during the operation of the glue coating machine, such as the movement of the glue coating head and the vibration of the equipment, relative sliding may occur between the glass substrate and the jig, which greatly reduces the support stability. On the other hand, after long-term use, the surface of the jig may further reduce the friction due to wear, resulting in a deterioration in the support effect and an inability to effectively prevent the glass substrate from sagging. Therefore, there is an urgent need for a sagging jig that can effectively solve the problem of sagging of the glass substrate and avoid insufficient support caused by slipping. At the same time, it can also improve the versatility and flexibility of the jig to meet the gluing needs of glass substrates of different sizes and shapes. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art. The present invention proposes a large-size glass substrate sagging fixture for a glue coating machine.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: A large-size glass substrate sagging jig for a glue coating machine, comprising a supporting jig, an expansion block is arranged at the bottom end of the supporting jig, a bottom jig is arranged at the bottom end of the expansion block, the expansion block is between the supporting jig and the bottom jig, a positioning hole is opened inside the supporting jig, a fixing bolt is embedded inside the positioning hole, the fixing bolt is used to fix the supporting jig and the bottom jig on the glue coating machine, and a rubber ring for wrapping the top of the fixing bolt is arranged at the upper edge of the positioning hole; A suction piece is arranged in the middle position of the supporting jig, a gasket is also arranged on the top surface of the supporting jig, the gasket and the suction piece are supported on the lower surface of the glass substrate, a movable disk is embedded in the supporting jig, a guide assembly is arranged at the bottom end of the movable disk, a suction piece is connected to the top end of the movable disk, and the movable disk is controlled to descend by the guide assembly, thereby driving the suction piece to descend.

[0007] Furthermore, a first sliding groove is provided on the mating surface of the expansion block and the support jig, the bottom end of the support jig is embedded in the interior of the first sliding groove, and a sliding connection is maintained between the support jig and the first sliding groove. A sliding block is provided on a side surface of the expansion block close to the bottom jig, a second sliding groove is provided on the surface of the bottom jig, the sliding block is embedded in the interior of the second sliding groove, and the sliding block and the second sliding groove are slidably connected.

[0008] Furthermore, a connecting column is fixedly connected to the middle position of the bottom jig, one side surface of the two groups of expansion blocks are both fitted on the connecting column, and the bottom jig and the supporting jig are fixedly connected together through the connecting column.

[0009] Furthermore, a movable bin is provided inside the supporting fixture, the movable disk and the guide assembly are both embedded inside the movable bin, and a partition plate is embedded inside the movable bin, and the partition plate is used to separate the movable disk and the guide assembly.

[0010] Furthermore, the guide assembly includes a supporting spring sheet, which is fixedly connected to the inner wall of the movable bin, a lifting sheet is connected to the middle position of the supporting spring sheet, a lifting column is installed on the lifting sheet, and the lifting column passes through the interior of the partition plate and is connected to the movable disk.

[0011] Furthermore, a guide bar is fixedly connected to the supporting spring sheet, and the guide bar is arranged at both ends of the supporting spring sheet in an inclined manner upward.

[0012] Furthermore, an inner plate is fixedly connected to the inner side of the expansion block, a lifting rod is fixedly connected to the surface of the inner plate by bolts, a side of the lifting rod close to the guide bar is arranged as an inclined surface, and the guide bar and the lifting rod are matched.

[0013] Furthermore, an adaptive component is embedded in the interior of the movable warehouse, and the adaptive component includes a support ring. The interior of the movable warehouse includes a support ring and a support pad, and an expansion joint is provided between the support ring and the support pad.

[0014] Furthermore, the top and bottom ends of the support ring and the support pad pass through the movable bin and are fixed on the inner wall of the movable bin, and the support ring and the support pad are used to support the interior of the movable bin.

[0015] Furthermore, the support ring, support pad, support jig, expansion block and bottom jig are all made of PEEK material, and the surface roughness of the support jig is polished to 0.02 microns.

[0016] Compared with the prior art, the beneficial effects of the present invention include: supporting the glass substrate by the support fixture, and cooperating with the gasket ring and the suction piece in the support assembly to jointly support the lower surface of the glass substrate, effectively avoiding the sagging problem of the thin glass substrate during the dispensing process. In terms of adsorption and fixation, the suction piece is used to form a negative pressure to adsorb the glass substrate downward, which increases the fixation of the four corners of the glass substrate, improves the connection stability, and avoids shaking and displacement; at the same time, the suction piece cooperates with the gasket ring to deform and restore when adsorbing and taking the glass substrate, which not only improves the adsorption stability, but also prevents the glass substrate from breaking or breaking due to the adsorption force when taking it, and facilitates the operation.

[0017] In terms of installation protection, the present invention covers the top of the fixing bolt with a rubber ring to prevent the glass substrate from being scratched by contact with the fixing bolt. In terms of thermal expansion and contraction, a movable chamber is provided inside the support fixture to provide space for thermal expansion and contraction. A support ring and a support pad are provided in the movable chamber to enhance the overall rigidity and ensure that the upper surface of the support fixture is level. An expansion joint is reserved between the support ring and the support pad as an elastic buffer area, which further reduces the risk of deformation caused by thermal expansion and contraction, ensures that the glass substrate is always in a horizontal state during the gluing process, and improves the gluing quality and product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The disclosure of the present invention is explained with reference to the accompanying drawings. It should be understood that the accompanying drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the accompanying drawings, the same reference numerals are used to refer to the same components.

[0020] Figure 1 A schematic diagram of the three-dimensional structure of a sagging fixture proposed according to an embodiment of the present invention is shown; Figure 2 The schematic diagram shows the structure of the sagging jig support jig and the rubber ring according to one embodiment of the present invention; Figure 3The schematic diagram shows the structure of the sagging jig support jig and the positioning hole according to one embodiment of the present invention; Figure 4 A schematic diagram of a partial cross-sectional structure of a sagging jig support jig and an expansion block according to an embodiment of the present invention is shown; Figure 5 The schematic diagram of the structure of the drooping jig support ring and the support pad according to one embodiment of the present invention is shown; Figure 6 The schematic diagram shows the structure of the inner plate and the lifting rod of the sagging fixture according to one embodiment of the present invention; Figure 7 The exploded structure diagram of the sagging jig proposed according to one embodiment of the present invention is schematically shown; Figure 8 The schematic diagram of the decomposed structure of the movable plate and the lifting column of the sagging fixture proposed according to one embodiment of the present invention is shown schematically.

[0021] In the figure: 11. Support fixture; 12. Extension block; 13. Bottom fixture; 14. Fixing bolt; 15. Rubber ring; 16. Positioning hole; 2. Support assembly; 21. Gasket; 22. Suction plate; 23. Connecting column; 24. Movable bin; 25. Movable disk; 26. First sliding groove; 27. Sliding block; 28. Second sliding groove; 29. ​​Partition plate; 3. Adaptive assembly; 31. Support ring; 32. Support pad; 33. Expansion joint; 4. Guide assembly; 41. Inlaid plate; 42. Lifting rod; 43. Lifting sheet; 44. Support spring piece; 45. Lifting column; 46. Guide strip. DETAILED DESCRIPTION

[0022] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the whole of the present invention or as a limitation or restriction to the technical solution of the present invention.

[0023] According to one embodiment of the present invention, Figure 1-Figure 8A large-size glass substrate sagging jig for a glue coating machine comprises a support jig 11, an expansion block 12 is arranged at the bottom end of the support jig 11, a bottom jig 13 is arranged at the bottom end of the expansion block 12, the expansion block 12 is between the support jig 11 and the bottom jig 13, a positioning hole 16 is opened inside the support jig 11, a fixing bolt 14 is embedded inside the positioning hole 16, the fixing bolt 14 is used to fix the support jig 11 and the bottom jig 13 on the glue coating machine, and a rubber ring 15 for wrapping the top of the fixing bolt 14 is arranged at the upper edge of the positioning hole 16; in the dispensing of the glass substrate, since the thickness of the glass substrate is relatively thin, the glass substrate can be supported by the support jig 11 to prevent the glass substrate from sagging, so when the support jig 11 is installed, it is fixed on the glue coating machine by the fixing bolt 14, and the glass substrate is placed on the support jig 11 for supporting it.

[0024] A suction piece 22 is provided in the middle position of the support fixture 11, and a gasket 21 is also provided on the top surface of the support fixture 11. The gasket 21 and the suction piece 22 are supported on the lower surface of the glass substrate. A movable disk 25 is embedded in the support fixture 11, and a guide component 4 is provided at the bottom end of the movable disk 25. The suction piece 22 is connected to the top end of the movable disk 25. The movable disk 25 is controlled by the guide component 4 to descend, thereby driving the suction piece 22 to descend. A first sliding groove 26 is provided on the mating surface between the expansion block 12 and the support jig 11, and the bottom end of the support jig 11 is embedded in the first sliding groove 26. The support jig 11 and the first sliding groove 26 maintain a sliding connection. A sliding block 27 is provided on the side surface of the expansion block 12 close to the bottom jig 13. A second sliding groove 28 is provided on the surface of the bottom jig 13. The sliding block 27 is embedded in the second sliding groove 28, and the sliding block 27 and the second sliding groove 28 are slidably connected.

[0025] In the large-size glass substrate sagging jig of the glue coating machine, the support jig 11 plays an extremely critical role. A suction piece 22 is precisely set in the middle position of the support jig 11, and a gasket 21 is reasonably arranged on its top surface. The two work together to support the lower surface of the glass substrate. The gasket 21 has a certain elasticity and buffering performance, which can effectively disperse the pressure of the glass substrate and avoid damage to the glass substrate caused by excessive local pressure; the suction piece 22 bears the important responsibility of adsorbing and fixing the glass substrate to ensure that the glass substrate will not move during the glue coating process.

[0026] A connecting column 23 is fixedly connected to the middle position of the bottom fixture 13, and one side surface of the two groups of expansion blocks 12 are both attached to the connecting column 23, and the bottom fixture 13 and the supporting fixture 11 are fixedly connected together through the connecting column 23; In order to strengthen the fixation of the four corners of the glass substrate, when the glass substrate is placed on the upper surface of the suction piece 22, the suction piece 22 is recessed downward so that the suction piece 22 can be better adsorbed on the glass substrate. The stability of the connection is increased by adsorption, and the displacement of the glass substrate caused by shaking can be avoided.

[0027] A movable bin 24 is provided inside the supporting fixture 11, and a movable disk 25 and a guide assembly 4 are both embedded inside the movable bin 24. A partition plate 29 is embedded inside the movable bin 24, and the partition plate 29 is used to separate the movable disk 25 and the guide assembly 4. The guide assembly 4 includes a supporting spring 44, and the supporting spring 44 is fixedly connected to the inner wall of the movable bin 24. A lifting piece 43 is connected to the middle position of the supporting spring 44, and a lifting column 45 is installed on the lifting piece 43. The lifting column 45 passes through the interior of the partition plate 29 and is connected to the movable disk 25. A guide bar 46 is fixedly connected to the supporting spring 44, and the guide bar 46 is inclined upwardly arranged at both ends of the supporting spring 44. An inner plate 41 is fixedly connected to the inner side of the expansion block 12, and a lifting rod 42 is fixedly connected to the surface of the inner plate 41 by bolts. The side of the lifting rod 42 close to the guide bar 46 is set as an inclined surface, and the guide bar 46 and the lifting rod 42 are adapted to each other.

[0028] When the glass substrate is adsorbed by the suction sheet 22, the specific operation is as follows: first, the support jig 11 is placed at the corresponding position of the glue spreader, and the support jig 11 and the glue spreader are connected together by the fixing bolt 14, and the fixing bolt 14 is rotated until the fixing bolt 14 is embedded in the bottom end of the rubber ring 15, and the upper surface of the fixing bolt 14 is covered by the rubber ring 15. In this way, when the glass substrate is placed on the upper surface of the support jig 11, the glass substrate will not contact with the fixing bolt 14. When there is no contact, the risk of scratching the glass substrate can be avoided; After the support fixture 11 is installed, the glass substrate is placed on the upper surface of the support fixture 11. After placement, the two expansion blocks 12 are moved in two different directions by sliding the expansion block 12. When the expansion block 12 slides between the support fixture 11 and the bottom fixture 13, the inner panel 41 is driven to move. When the inner panel 41 is slid, the lifting rod 42 is driven to move. At this time, the lifting rod 42 will gradually separate from the bottom end of the lifting piece 43. After the lifting rod 42 and the lifting piece 43 are separated, the lifting piece 43 will move downward under the action of the supporting spring piece 44. When the lifting piece 43 descends, it drives the lifting column 45 and the movable disk 25 to descend. Since the movable disk 25 is arranged in the middle position of the suction piece 22, when the middle position of the connecting column 23 is pulled by the movable disk 25, the middle of the suction piece 22 is recessed inward. At this time, the recessed part of the suction piece 22 and the glass substrate Negative pressure will be formed between the plates, so that the position of the glass substrate can be better fixed by the suction piece 22 to prevent damage to the glass substrate caused by accidental sliding. After the dispensing of the glass substrate is completed, the two groups of expansion blocks 12 are brought closer to each other by sliding the expansion block 12. At this time, the movement of the expansion block 12 drives the movement of the lifting rod 42. When the lifting rod 42 contacts the guide bar 46, the lifting rod 42 is gradually embedded into the bottom end of the lifting piece 43 through the guidance of the inclined design of the guide bar 46. At this time, due to the addition of the lifting rod 42, the height of the lifting piece 43 is increased. At this time, the originally concave suction piece 22 can be restored again, so that the negative pressure of the concave part is converted into a normal pressure state. At this time, the glass substrate will not be attracted by the support fixture 11 when it is taken. In such an environment, it can be avoided that the glass substrate is adsorbed on the support fixture 11, which causes difficulty in taking. In order to further improve the stability of the glass substrate and the convenience of taking it, the suction piece 22 is provided with a gasket 21. When the suction piece 22 sucks, negative pressure is generated. In the negative pressure state, the glass is firmly adsorbed on the supporting jig 11. At this time, the gasket 21 will be deformed and embedded in the inside of the supporting jig 11, and remain flush with the upper surface of the supporting jig 11. When the suction piece 22 rises, the suction piece 22 and the glass substrate are in a normal pressure state. At this time, the gasket 21 is restored. The overall height of the restored gasket ring 21 is higher than the upper surface of the supporting jig 11. At this time, the glass substrate is supported. Through such a design, the glass substrate can be prevented from being adsorbed on the supporting jig 11. If the staff is not careful when taking it, the glass substrate will be affected by the adsorption force and the edge will collapse or even break.

[0029] The movable bin 24 is embedded with an adaptive component 3, which includes a support ring 31, a support ring 31 and a support pad 32 are embedded in the movable bin 24, an expansion joint 33 is provided between the support ring 31 and the support pad 32, the top and bottom ends of the support ring 31 and the support pad 32 pass through the movable bin 24 and are fixed on the inner wall of the movable bin 24, the support ring 31 and the support pad 32 are used to support the inside of the movable bin 24, and the support ring 31, the support pad 32, the support fixture 11, the expansion block 12 and the bottom fixture 13 are all made of PEEK The support jig 11 is made of a material, and the surface roughness of the support jig 11 is polished to 0.02 microns. During the use of the support jig 11, due to the continuous change of the working temperature, if the interior of the support jig 11 is a solid structure, after being heated, the support jig 11 will expand. When the support jig 11 expands, it will cause an irregular plane to appear on the upper surface of the support jig 11, which will affect the support of the support jig 11. During the glue coating operation, the change of ambient temperature is inevitable, which will cause the support jig 11 to expand and contract with heat. If there is not enough space to accommodate this size change, the support jig 11 may be deformed due to excessive internal stress, which will affect its support effect on the glass substrate, resulting in the glass substrate being unable to remain flat, and ultimately affecting the glue coating quality. Therefore, the movable chamber 24 is provided inside the support fixture 11, and its primary function is to provide necessary space for its thermal expansion and contraction, so that the component support fixture 11 can adjust its size naturally when the temperature changes, and avoid deformation due to thermal stress concentration. At the same time, in order to ensure that the upper surface of the support fixture 11 can remain horizontal under various working conditions to stably support the glass substrate, a support ring 31 and a support pad 32 are provided inside the movable chamber 24 for internal support. These two support structures are like a solid skeleton, which enhances the overall rigidity of the component support fixture 11, enabling it to withstand the weight of the glass substrate and the external force that may be generated during the glue coating process, and prevent the upper surface from tilting or sinking due to uneven force, thereby ensuring that the glass substrate is always in a horizontal state during the glue coating process, creating good conditions for uniform glue coating.

[0030] However, the thermal expansion and contraction caused by temperature changes do not occur uniformly, and the degree of expansion or contraction of different parts may be different. The reserved expansion joint 33 space can be used as an elastic buffer area. When the component support fixture 11 expands due to heat, its internal material can expand to the expansion joint 33 space to avoid excessive stress concentration due to local expansion restriction; when the temperature decreases and shrinks, the expansion joint 33 space can also provide a certain margin for the shrinkage process, so that the component support fixture 11 can restore its size more freely, further reducing the risk of deformation caused by thermal expansion and contraction, and ensuring the horizontality of the upper surface of the support fixture 11.

[0031] The technical scope of the present invention is not limited to the contents in the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of ​​the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A large-size glass substrate sagging fixture for a glue coating machine, characterized in that: The invention comprises a support jig (11), wherein an expansion block (12) is arranged at the bottom end of the support jig (11), and a bottom jig (13) is arranged at the bottom end of the expansion block (12); the expansion block (12) is located between the support jig (11) and the bottom jig (13); a positioning hole (16) is provided inside the support jig (11), and a fixing bolt (14) is embedded inside the positioning hole (16); the fixing bolt (14) is used to fix the support jig (11) and the bottom jig (13) on a glue leveling machine; and a rubber ring (15) is provided at the upper edge of the positioning hole (16) for wrapping the top end of the fixing bolt (14); A suction piece (22) is arranged in the middle of the support jig (11), a gasket ring (21) is also arranged on the top surface of the support jig (11), the gasket ring (21) and the suction piece (22) support the lower surface of the glass substrate, a movable disk (25) is embedded in the support jig (11), a guide component (4) is arranged at the bottom end of the movable disk (25), the suction piece (22) is connected to the top end of the movable disk (25), and the movable disk (25) is controlled by the guide component (4) to descend, thereby driving the suction piece (22) to descend.

2. The large-size glass substrate sagging jig for a glue coating machine as claimed in claim 1, characterized in that: A first sliding groove (26) is provided on the mating surface of the expansion block (12) and the support jig (11); the bottom end of the support jig (11) is embedded in the first sliding groove (26); the support jig (11) and the first sliding groove (26) are in sliding connection; a sliding block (27) is provided on a side surface of the expansion block (12) close to the bottom jig (13); a second sliding groove (28) is provided on the surface of the bottom jig (13); the sliding block (27) is embedded in the second sliding groove (28); the sliding block (27) and the second sliding groove (28) are in sliding connection.

3. The large-size glass substrate sagging jig for a glue coating machine as claimed in claim 1, characterized in that: A connecting column (23) is fixedly connected to the middle position of the bottom jig (13), one side surface of the two groups of expansion blocks (12) are both fitted on the connecting column (23), and the bottom jig (13) and the supporting jig (11) are fixedly connected together via the connecting column (23).

4. The large-size glass substrate sagging jig for a glue coating machine as claimed in claim 1, characterized in that: A movable bin (24) is provided inside the supporting fixture (11), the movable disk (25) and the guide assembly (4) are both embedded inside the movable bin (24), and a partition plate (29) is embedded inside the movable bin (24), the partition plate (29) being used to separate the movable disk (25) and the guide assembly (4).

5. The large-size glass substrate sagging jig for a glue coating machine as claimed in claim 4, characterized in that: The guide assembly (4) comprises a supporting spring sheet (44), wherein the supporting spring sheet (44) is fixedly connected to the inner wall of the movable bin (24), a lifting sheet (43) is connected to the middle position of the supporting spring sheet (44), a lifting column (45) is mounted on the lifting sheet (43), and the lifting column (45) passes through the interior of the partition plate (29) and is connected to the movable disk (25).

6. The large-size glass substrate sagging jig for a glue coating machine as claimed in claim 5, characterized in that: A guide bar (46) is fixedly connected to the supporting spring sheet (44), and the guide bar (46) is arranged at both ends of the supporting spring sheet (44) in an inclined manner upward.

7. The large-size glass substrate sagging jig for a glue coating machine as claimed in claim 1, characterized in that: An inner plate (41) is fixedly connected to the inner side of the expansion block (12); a lifting rod (42) is fixedly connected to the surface of the inner plate (41) via bolts; a side of the lifting rod (42) close to the guide bar (46) is arranged as an inclined surface; the guide bar (46) and the lifting rod (42) are matched.

8. The large-size glass substrate sagging jig for a glue coating machine as claimed in claim 4, characterized in that: An adaptable component (3) is embedded in the movable bin (24), the adaptable component (3) comprises a support ring (31), a support ring (31) and a support pad (32) are embedded in the movable bin (24), and an expansion joint (33) is provided between the support ring (31) and the support pad (32).

9. The large-size glass substrate sagging jig for a glue coating machine as claimed in claim 8, characterized in that: The top and bottom ends of the support ring (31) and the support pad (32) pass through the movable bin (24) and are fixed on the inner wall of the movable bin (24); the support ring (31) and the support pad (32) are used to support the interior of the movable bin (24).

10. The large-size glass substrate sagging jig for a glue coating machine as claimed in claim 9, characterized in that: The support ring (31), the support pad (32), the support jig (11), the expansion block (12) and the bottom jig (13) are all made of PEEK material, and the surface roughness of the support jig (11) is polished to 0.02 micrometers.

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