A self-centering device for clamping ultra-thin materials

Abstract

The present invention provides a self-centering device for clamping ultra-thin materials, which belongs to the technical field of centering devices, and includes a preliminary self-centering component and a reinforcement and stabilization component. The preliminary self-centering component includes a rotating ring and a plurality of clamping jaws. The reinforcement and stabilization component includes a downward pressure limiter and a unified downward pressure member. The downward pressure limiter includes a limiter base body, and a downward pressure limiter surface and a side limiter surface are arranged on the limiter base body. The self-centering device for clamping ultra-thin materials firstly and automatically performs centering and positioning of the object to be measured, and then limits and fixes the object to be measured directly from the top, thereby improving the stability and reliability of the position state of the object to be measured, and avoiding the situation that the object to be measured is separated from the clamping area or cannot be accurately and stably in the centering state. At the same time, the clamping jaws are limited from the side, thereby improving the stability of the clamping and limiting state of the object to be measured from the side, and the stability, reliability and accuracy of the centering and clamping work of the object to be measured are effectively improved as a whole.

Description

Technical Field

[0001] The invention relates to the technical field of centering devices, in particular to a self-centering device for clamping ultra-thin materials. Background Art

[0002] Self-centering devices are used in various optical systems and play an important role. In most cases, since the optical axis of the optical precision lens needs to be accurately aligned with the center of the object being measured, the optical precision lens is usually immovable and only the object being measured can be moved. Therefore, a self-centering device is usually used to center and limit the object being measured to meet the need to align the object being measured with the optical axis of the optical precision lens.

[0003] However, at present, the existing self-centering clamping devices are usually used to center and clamp thicker objects to be measured, and they cannot effectively meet the needs of centering and limiting thinner objects to be measured. During use, since the contact area of ​​the side of the object to be measured is narrow, in this state, if the clamping force applied is too small, it is difficult to stably and reliably center and clamp the object to be measured. If the clamping force is too large, it is easy for the object to be measured to leave the clamping area or cannot be accurately placed in a horizontally centered state. Summary of the invention

[0004] The present invention provides a self-centering device for clamping ultra-thin materials, so as to solve the problem in the related art that thinner materials cannot be clamped stably and reliably to meet the requirement of aligning the optical axis of the measured object with the optical precision lens.

[0005] The present invention provides a self-centering device for clamping ultra-thin materials, the self-centering device for clamping ultra-thin materials comprises a fixed disk, the fixed disk is used to place the object to be measured; a preliminary self-centering component, the preliminary self-centering component comprises a rotating ring coaxially arranged and rotatably connected with the fixed disk, a plurality of clamping jaws are rotatably arranged on the fixed disk, the plurality of clamping jaws are distributed along the circumference of the fixed disk, and a driving pin is arranged between the clamping jaw and the rotating ring, the driving pin is slidably connected with the rotating ring and rotatably connected with the clamping jaw, an elastic connecting piece is connected between the rotating ring and the fixed disk, the inner sides of the plurality of clamping jaws constitute a clamping limit area, an external force is applied to rotate the rotating ring to uniformly control the clamping jaws to rotate, open the clamping jaws to expand the clamping area, after the object to be measured is placed, the external force is released, and the rotating ring is rotated. The ring uniformly controls the jaws to reset and rotate under the action of the elastic connecting piece, and automatically performs preliminary centering and limiting on the object to be measured; a reinforcement and stabilization component is provided, wherein the reinforcement and stabilization component includes downward pressure limiting pieces corresponding to the jaws one by one and a unified downward pressure limiting piece that uniformly presses down the downward pressure limiting piece, wherein the downward pressure limiting piece is slidably connected with the corresponding jaws, and the downward pressure limiting piece includes a limiting base, wherein the limiting base is provided with a downward pressure limiting surface for limiting the object to be measured from above and a side limiting surface for limiting the jaws from outside, when the limiting base moves downward for limiting, the downward pressure limiting surface limits the object to be measured from above, and the side limiting surface limits the jaws from outside, wherein the unified downward pressure piece is a cover body, and the area in the middle of the cover body corresponding to the object to be measured is a visible area.

[0006] In one possible implementation, the clamp includes a connecting base, which is bent and connected to a rotating pin at the bend, and the rotating pin is rotatably connected to a fixed plate. A strip-shaped limiting eaves is fixedly provided on the connecting base, and the limiting eaves limits the object to be measured from the side. The downward limiting surface is a strip-shaped structure and is distributed parallel to the limiting eaves. The downward limiting surface is located on the side of the corresponding limiting eaves close to the object to be measured.

[0007] In one possible implementation, the limiting base includes a connecting part slidably connected to the clamping jaw, a pressing part and a side limiting part are slidably connected to the connecting part, the pressing part limit surface is located on the pressing part, the side limiting surface is located on the side limiting part, and elastic connecting bodies are arranged between the pressing part and the connecting part, between the connecting part and the clamping jaw, and between the side limiting part and the connecting part.

[0008] In one possible implementation, there are several elastic connectors distributed along the circumference of the rotating ring. The elastic connectors include a tension spring, a spring pin 1 and a spring pin 2. One end of the tension spring is fixedly connected to the spring pin 1 and the other end is fixedly connected to the spring pin 2. The spring pin 1 is fixedly connected to the rotating ring and the spring pin 2 is connected to the fixed disk. The fixed disk is provided with several fixed sockets. The spring pin 2 is inserted into the fixed sockets and can be inserted into different fixed sockets to adjust the tension of the tension spring on the rotating ring when there is no external force.

[0009] In a possible implementation, a limiting groove is provided on the rotating ring, and the limiting groove limits the spring pin 2, restricts the movable range of the spring pin 2 in the circumferential direction, and limits the spring pin 2 in the axial direction.

[0010] In a possible implementation, the top surface of the connecting portion is a friction contact surface, and a friction pressing surface with an annular structure is provided on the unified pressing member, and the friction contact surface is in contact with the friction pressing surface.

[0011] In a possible implementation, limiting bodies are provided between the pressing portion and the connecting portion, between the connecting portion and the clamping claw, and between the side limiting portion and the connecting portion, and the limiting bodies cooperate with corresponding elastic connecting bodies to perform elastic limiting.

[0012] In a possible implementation, the side limiting surface is an inclined surface, and a contact limiting piece corresponding to the side limiting surface is rotatably provided on the clamping jaw.

[0013] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: 1. According to a self-centering device for clamping ultra-thin materials provided in an embodiment of the present invention, the preliminary self-centering component first automatically and preliminarily centers and limits the object to be measured, and then the reinforcement and stabilization component directly limits and fixes the object to be measured from above, thereby improving the stability and reliability of the position of the object to be measured, and avoiding the situation where the object to be measured is out of the clamping area or cannot be accurately and stably in the centered state. At the same time, the reinforcement and stabilization component limits the clamping jaws from the side, thereby improving the stability of the clamping limit state of the object to be measured from the side, thereby effectively improving the stability, reliability and accuracy of the centering and clamping work of the object to be measured.

[0014] 2. According to an embodiment of the present invention, a self-centering device for clamping ultra-thin materials is provided. The connecting part applies a flexible downward pressure on the object to be measured through a downward pressing part and a side limiting part, and applies a flexible side limiting force on the clamping claws. On the basis of improving the stability of the position state of the object to be measured, damage to the object to be measured is effectively avoided.

[0015] 3. According to an embodiment of the present invention, a self-centering device for clamping ultra-thin materials is provided, in which a connecting base cooperates with a limiting eaves to effectively center and limit the object to be measured, while providing a stable and reliable installation environment for the downward limiting component, thereby improving the stability and reliability of the overall structure. The limiting eaves of the strip structure and the downward limiting surface of the strip structure are conducive to improving the scope of application of the present invention and reducing the area of ​​the overlapping region between the downward limiting surface and the object to be measured, thereby avoiding affecting the subsequent detection of the object to be measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of a self-centering device for clamping ultra-thin materials provided by an embodiment of the present invention.

[0017] Figure 2 It is a structural schematic diagram of a clamping jaw, an elastic connecting piece and a rotating ring of a self-centering device for clamping ultra-thin materials provided by an embodiment of the present invention.

[0018] Figure 3 It is a schematic diagram of the exploded structure of a self-centering device for clamping ultra-thin materials provided by an embodiment of the present invention.

[0019] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0020] Figure 5 The present invention is a schematic structural diagram of a limiting base, a downward limiting surface and a side limiting surface of a self-centering device for clamping ultra-thin materials provided by an embodiment of the present invention.

[0021] Figure 6The invention is a schematic structural diagram of a unified pressing member and a friction pressing surface of a self-centering device for clamping ultra-thin materials provided by an embodiment of the present invention.

[0022] In the figure: 1. fixed plate; 2. object to be measured; 3. preliminary self-centering component; 31. rotating ring; 32. clamping claw; 321. connecting base; 322. rotating pin; 323. limiting eaves; 324. mounting hole; 33. driving pin; 34. elastic connecting member; 341. tension spring; 342. spring pin one; 343. spring pin two; 344. fixed socket; 35. limiting groove; 36. slide groove; 37. stable limiting member; 4. reinforced stable component; 41. downward pressure limiting member; 411. limiting base; 4111. connecting part; 4112. downward pressure part; 4113. side limiting part; 4115. limiting body; 4114. elastic connecting body; 412. downward pressure limiting surface; 413. side limiting surface; 414. contact limiting member; 42. unified downward pressure member; 43. friction downward pressure surface. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0024] See also Figure 1 , Figure 2 , Figure 3 and Figure 5 A self-centering device for clamping ultra-thin materials comprises a fixed disk 1, a preliminary self-centering component 3 and a reinforcement stabilization component 4, wherein the fixed disk 1 is used to place a circular structured object 2 to be measured, the fixed disk 1 is provided with a preliminary self-centering component 3, the preliminary self-centering component 3 comprises a rotating ring 31 coaxially arranged and rotatably connected with the fixed disk 1, a plurality of clamping jaws 32 are rotatably arranged on the fixed disk 1, the plurality of clamping jaws 32 are distributed along the circumference of the fixed disk 1, and a driving pin 33 is arranged between the clamping jaw 32 and the rotating ring 31, the driving pin 33 is slidably connected with the rotating ring 31 and rotatably connected with the clamping jaw 32, an elastic connecting member 34 is connected between the rotating ring 31 and the fixed disk 1, and the inner sides of the plurality of clamping jaws 32 constitute a clamping limit zone, such as Figure 3As shown, there are three clamping jaws 32, and a sliding groove 36 is provided on the rotating ring 31, and the sliding groove 36 corresponds to the driving pin 33 one by one, and the driving pin 33 slides in the corresponding sliding groove 36. During use, an external force is applied to rotate the rotating ring 31 to uniformly control the clamping jaws 32 to rotate and open, thereby expanding the clamping area. After the object 2 to be measured is placed, the external force is released, and the rotating ring 31 controls the clamping jaws 32 to reset and rotate under the action of the elastic connecting member 34, automatically performing preliminary centering and limiting of the object 2 to be measured, and then the reinforcement and stabilization component 4 directly limits and fixes the object 2 to be measured from above on the one hand, thereby improving the stability of the position state of the object 2 to be measured 2, and limits and fixes the clamping jaws 32 from the side on the other hand, thereby improving the stability and reliability of the clamping and limiting of the object 2 to be measured by the clamping jaws 32, thereby improving the stability and reliability of the position state of the object 2 to be measured, and can effectively perform stable and reliable centering and clamping work on thinner objects 2 to be measured.

[0025] See also Figure 1 , Figure 2 , Figure 3 and Figure 5 The reinforcement and stabilization component 4 includes a downward pressure limit piece 41 corresponding to the clamping jaws 32 one by one and a unified downward pressure limit piece 42 that unifies the downward pressure limit piece 41. The downward pressure limit piece 41 includes a limit base 411 vertically slidably connected to the clamping jaws 32. The limit base 411 is provided with a downward pressure limit surface 412 for limiting the object 2 to be measured from the top and a side limit surface 413 for limiting the clamping jaws 32 from the outside. When the clamping jaws 32 complete the preliminary centering and limiting of the object to be measured, the unified downward pressure piece 42 moves downward to the unified downward pressure limit base 411, the limiting base 411 moves downward, the downward pressure limit surface 412 limits the object 2 to be measured from the top to prevent the object 2 to be measured from escaping from the limiting of the clamping jaws 32, thereby improving the stability of the position state of the object 2 to be measured, and the side limit surface 413 limits the clamping jaws 32 from the outside to improve the stability and reliability of the clamping jaws 32 limiting the object 2 to be measured.

[0026] See also Figure 3 , Figure 5 and Figure 6 The limiting base 411 includes a connecting portion 4111 slidably connected to the clamping jaw 32, a pressing portion 4112 and a side limiting portion 4113 are slidably connected to the connecting portion 4111, the pressing limiting surface 412 is located on the pressing portion 4112, the side limiting surface 413 is located on the side limiting portion 4113, and an elastic connecting body 4114 is provided between the pressing portion 4112 and the connecting portion 4111, between the connecting portion 4111 and the clamping jaw 32, and between the side limiting portion 4113 and the connecting portion 4111. Figure 5As shown, the pressing portion 4112 is connected to the connecting portion 4111 by sliding up and down, and the side limiting portion 4113 is connected to the connecting portion 4111 by sliding inward and outward directions. The connecting portion 4111 moves downward under the downward pressure of the unified pressing member 42, and the pressing portion 4112 moves downward accordingly, so that the pressing limit surface 412 applies a flexible downward pressure and acts on the object 2 to be measured. At the same time, the side limiting portion 4113 applies a flexible side limiting force through the side limiting surface 413 and acts on the clamping jaw 32. On the basis of improving the stability of the position state of the object 2 to be measured, damage to the object 2 to be measured is effectively avoided. Among them, the top surface of the connecting portion 4111 is a friction contact surface, and a friction pressing surface 43 with an annular structure is provided on the unified pressing member 42. The friction contact surface contacts the friction pressing surface 43, thereby improving the stability of the downward movement of the connecting portion 4111, and correspondingly improving the stability and accuracy of the limiting process of the clamping jaw 32 and the limiting process of the object 2 to be measured.

[0027] See also Figure 2 , Figure 3 and Figure 5 The clamping jaw 32 includes a connecting base 321, the connecting base 321 is bent and a rotating pin 322 is connected at the bending part, and the rotating pin 322 is rotatably connected to the fixed disk 1. Figure 3 As shown, a mounting hole 324 corresponding to the rotating pin 322 is provided on the fixed disk 1, and a strip-shaped limiting eaves 323 is fixedly provided on the connecting base 321. The limiting eaves 323 center and limit the object 2 to be measured from the side. The downward pressure limiting surface 412 is a strip-shaped structure and is distributed parallel to the limiting eaves 323. The downward pressure limiting surface 412 is located on the side of the corresponding limiting eaves 323 close to the object 2 to be measured. The strip-shaped limiting eaves 323 and the downward pressure limiting surface 412 are beneficial to improving the scope of application of the present invention, and can fully reduce the overlapping area between the downward pressure limiting surface 412 and the object 2 to be measured, so as to avoid the downward pressure limiting surface 412 affecting the subsequent detection of the object 2 to be measured. Moreover, the limiting eaves 323 are used to limit the object 2 to be measured from the side, so that the thinner object 2 to be measured can be effectively centered and limited. At the same time, the connecting base 321 can provide a stable and reliable installation environment for the downward pressure limiting component 41, so as to improve the stability and reliability of the overall structure.

[0028] See also Figure 2 , Figure 3 and Figure 4The elastic connectors 34 are arranged in a plurality and distributed along the circumference of the rotating ring 31. The elastic connectors 34 include a tension spring 341, a spring pin 1 342 and a spring pin 2 343. One end of the tension spring 341 is fixedly connected to the spring pin 1 342 and the other end is fixedly connected to the spring pin 2 343. The spring pin 1 342 is fixedly connected to the rotating ring 31. The spring pin 2 343 is connected to the fixed disk 1. The fixed disk 1 is provided with a plurality of fixed sockets 344. The spring pin 2 343 is plugged into the fixed sockets 344 and can be plugged into different fixed sockets 344 to adjust the tension of the tension spring 341 on the rotating ring 31 when no external force is applied. Figure 3 and Figure 4 As shown, by inserting the second spring pin 343 into different fixed sockets 344, the distance between the second spring pin 343 and the first spring pin 342 can be adjusted. In the absence of external force, the smaller the distance between the two, the smaller the tension of the tension spring 341 on the rotating ring 31, and vice versa. By controlling the distance between the second spring pin 343 and the first spring pin 342, the tension acting on the rotating ring 31 can be controlled to meet the centering and limiting requirements of the detected objects 2 of different sizes, thereby improving the scope of application of the present invention as well as the stability and reliability of its operation.

[0029] See also Figure 2 The rotating ring 31 is provided with a limiting groove 35, and the limiting groove 35 limits the spring pin 2 343, limits the activity range of the spring pin 2 343 in the circumferential direction, and limits the spring pin 2 343 in the axial direction. During the assembly process, the rotating pin 322, the driving pin 33 and the clamping claw 32 are first assembled into one part, and then the driving pin 33 is aligned with the corresponding sliding groove 36 on the rotating ring 31, and the rotating pin 322 is aligned with the mounting hole 324 on the fixed disk 1 and installed in the corresponding mounting hole 324. The rotating ring 31 is sleeved on the fixed disk 1, and the spring pin 2 343 is limited. 43 passes through the limit groove 35 and is inserted into the fixed socket 344 on the fixed disk 1. The overall structure is easy to assemble and has high reliability. On the basis of convenient assembly, in order to further improve the reliability of the overall structure, a stable limiter 37 is provided. The stable limiter 37 passes through the rotating ring 31 and is fixedly connected to the fixed disk 1. The stable limiter 37 limits the rotating ring 31 so that the rotating ring 31 can only rotate around the axis. Even in the process of replacing the fixed socket 344 with the spring pin 2 343, the stability and reliability of the overall structure can be guaranteed.

[0030] See also Figure 5A limiting body 4115 is provided between the pressing portion 4112 and the connecting portion 4111, between the connecting portion 4111 and the clamping claw 32, and between the side limiting portion 4113 and the connecting portion 4111. The limiting body 4115 cooperates with the corresponding elastic connecting body 4114 to perform elastic limiting. By the cooperation between the limiting body 4115 and the elastic connecting body 4114, taking the pressing portion 4112 and the connecting portion 4111 as an example, the limiting body 4115 is fixedly connected to the pressing portion 4112, and the limiting body 4115 is only It is slidably connected to the connecting part 4111 in the vertical direction. During the downward movement of the connecting part 4111, the pressing part 4112 is always in a horizontal state and slides up and down, thereby preventing the pressing part 4112 from tilting due to uneven force during the sliding process, which affects the limiting effect of the pressing limit surface 412. The same applies to the limiting body 4115 between the connecting part 4111 and the clamping claw 32, and between the side limiting part 4113 and the connecting part 4111, thereby effectively improving the stability and reliability of the working process of the overall structure.

[0031] See also Figure 5 The side limit surface 413 is an inclined surface, and a contact limit piece 414 corresponding to the side limit surface 413 is rotatably provided on the clamping jaw 32. The contact limit piece 414 is a roller. During the downward movement of the side limit surface 413, the clamping jaw 32 is limited by the contact limit piece 414, and at the same time, the resistance of the side limit surface 413 to the downward movement is reduced, thereby improving the smoothness and stability of the downward movement process.

[0032] See also Figure 1 The unified pressing member 42 is a cover body, and the area in the middle of the cover body corresponding to the object to be measured 2 is a visible area, which plays a role in dust prevention to improve the accuracy of subsequent detection.

[0033] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, or a sliding connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-centering device for clamping ultra-thin materials, characterized in that: It comprises a fixed plate (1), and the fixed plate (1) is used to place the object to be measured (2); A preliminary self-centering component (3), the preliminary self-centering component (3) comprising a rotating ring (31) coaxially arranged and rotatably connected to a fixed disk (1), a plurality of clamping jaws (32) rotatably arranged on the fixed disk (1), the plurality of clamping jaws (32) being distributed along the circumference of the fixed disk (1), and a driving pin (33) being arranged between the clamping jaws (32) and the rotating ring (31), the driving pin (33) being slidably connected to the rotating ring (31) and rotatably connected to the clamping jaws (32), and an elastic connecting member (34) being connected between the rotating ring (31) and the fixed disk (1); The inner sides of the plurality of clamping jaws (32) form a clamping limit area. When an external force is applied to rotate the rotating ring (31), the clamping jaws (32) are uniformly controlled to rotate and open the clamping jaws (32) to expand the clamping area. After the object (2) to be measured is placed, the external force is released, and the rotating ring (31) uniformly controls the clamping jaws (32) to reset and rotate under the action of the elastic connecting member (34), thereby automatically performing preliminary centering and limiting on the object (2) to be measured. A reinforcement and stabilization component (4), the reinforcement and stabilization component (4) comprising downward pressure limiting members (41) corresponding one to one with the clamping jaws (32) and a unified downward pressure limiting member (42) for uniformly pressing downward pressure limiting members (41), the downward pressure limiting member (41) being slidably connected with the corresponding clamping jaws (32), and the downward pressure limiting member (41) comprising a limiting base (411), the limiting base (411) being provided with a downward pressure limiting surface (412) for limiting the measured object (2) from above and a side limiting surface (413) for limiting the clamping jaws (32) from the outside, when the limiting base (411) moves downward to limit, the downward pressure limiting surface (412) limits the measured object (2) from above, and the side limiting surface (413) limits the clamping jaws (32) from the outside; The clamping jaw (32) comprises a connecting base (321), the connecting base (321) is in a bent shape and a rotating pin (322) is connected at the bent part, the rotating pin (322) is rotatably connected to the fixed disk (1), a strip-shaped limiting eave (323) is fixedly provided on the connecting base (321), the limiting eave (323) limits the measured object (2) from the side, the downward limiting surface (412) is in a strip-shaped structure and is distributed in parallel with the limiting eave (323), and the downward limiting surface (412) is located on the side of the corresponding limiting eave (323) close to the measured object (2).

2. A self-centering device for clamping ultra-thin materials according to claim 1, characterized in that: The limiting base (411) comprises a connecting portion (4111) slidably connected to the clamping jaw (32); a pressing portion (4112) and a side limiting portion (4113) are slidably connected to the connecting portion (4111); a pressing surface (412) is located on the pressing portion (4112); a side limiting surface (413) is located on the side limiting portion (4113); and elastic connecting bodies (4114) are provided between the pressing portion (4112) and the connecting portion (4111), between the connecting portion (4111) and the clamping jaw (32), and between the side limiting portion (4113) and the connecting portion (4111).

3. A self-centering device for clamping ultra-thin materials according to claim 1, characterized in that: The elastic connecting members (34) are in a plurality and are distributed along the circumference of the rotating ring (31). The elastic connecting members (34) include a tension spring (341), a spring pin 1 (342) and a spring pin 2 (343). One end of the tension spring (341) is fixedly connected to the spring pin 1 (342) and the other end is fixedly connected to the spring pin 2 (343). The spring pin 1 (342) is fixedly connected to the rotating ring (31). The spring pin 2 (343) is connected to the fixed disk (1). The fixed disk (1) is provided with a plurality of fixed plug holes (344). The spring pin 2 (343) is plugged into the fixed plug holes (344) and can be plugged into different fixed plug holes (344) to adjust the tension of the tension spring (341) on the rotating ring (31) when no external force is applied.

4. A self-centering device for clamping ultra-thin materials according to claim 3, characterized in that: The rotating ring (31) is provided with a limiting groove (35), which limits the spring pin 2 (343), restricts the activity range of the spring pin 2 (343) in the circumferential direction, and limits the spring pin 2 (343) in the axial direction.

5. The self-centering device for clamping ultra-thin materials according to claim 2, characterized in that: The top surface of the connecting portion (4111) is a friction contact surface, and a friction pressing surface (43) with an annular structure is provided on the unified pressing member (42), and the friction contact surface is in contact with the friction pressing surface (43).

6. A self-centering device for clamping ultra-thin materials according to claim 2, characterized in that: A limiting body (4115) is provided between the pressing portion (4112) and the connecting portion (4111), between the connecting portion (4111) and the clamping claw (32), and between the side limiting portion (4113) and the connecting portion (4111), and the limiting body (4115) cooperates with the corresponding elastic connecting body (4114) to perform elastic limiting.

7. The self-centering device for clamping ultra-thin materials according to claim 1, characterized in that: The side limiting surface (413) is an inclined surface, and a contact limiting piece (414) corresponding to the side limiting surface (413) is rotatably provided on the clamping jaw (32).

8. The self-centering device for clamping ultra-thin materials according to claim 1, characterized in that: The unified pressing member (42) is a cover body, and the area in the middle of the cover body corresponding to the object to be measured (2) is a visible area.

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