A clamp

Abstract

The embodiment of the present invention discloses a clamp, comprising: a first clamp, a second clamp, an elastic connection structure and a driving structure, wherein the second clamp can make a first movement away from the first clamp and a second movement toward the first clamp; the elastic connection structure is connected between the first clamp and the second clamp; the driving end of the driving structure acts on the second clamp; wherein the driving structure can overcome the elastic connection force of the elastic connection structure to make a driving movement, and the driving movement drives the second clamp to make the first movement; when the driving structure is reset, the elastic connection structure can make a restoring movement, and the restoring movement drives the second clamp to make the second movement. The use of this technical solution solves the technical problem of low reliability and convenience of the clamp in the prior art.

Description

Technical Field

[0001] The invention relates to the technical field of oral restorations, and in particular to a clamp. Background Art

[0002] In general denture processing, a clamp is required to clamp the denture material, and the reliability and convenience of the clamp are becoming increasingly important. The clamps in the prior art generally use screws to tighten the cover and then tighten the denture material, but this clamping method has the following problems: First, it takes a long time to turn the screws when clamping and unloading the denture material; second, the torque of tightening the screws is different each time, resulting in unstable clamping force applied by the cover to the denture material; third, there is a sequence in the process of tightening the screws. The local pressure at the place where the screws are tightened first is too large, and the denture material is unbalanced and easy to pry; for brittle materials, there is even a risk of cracking. Summary of the invention

[0003] Based on this, it is necessary to propose a clamp to address the above problems so as to solve the technical problems of low reliability and convenience of the clamp in the prior art.

[0004] To this end, an embodiment provides a clamp, comprising:

[0005] First splint;

[0006] a second clamping plate, the second clamping plate being capable of a first movement away from the first clamping plate and a second movement toward the first clamping plate;

[0007] An elastic connection structure connected between the first clamping plate and the second clamping plate;

[0008] and a driving structure, wherein a driving end of the driving structure acts on the second clamping plate;

[0009] Wherein, the driving structure can overcome the elastic connection force of the elastic connection structure to perform a driving movement, and the driving movement drives the second clamping plate to perform the first movement; when the driving structure is reset, the elastic connection structure can perform a restoring movement, and the restoring movement drives the second clamping plate to perform the second movement.

[0010] In some embodiments of the clamp, the elastic connection structure includes a connecting shaft and an elastic member, the elastic member is connected between the first clamping plate and the second clamping plate, the connecting shaft is movably received in the through hole, one end of the connecting shaft extends out of the through hole to be fixedly connected to the second clamping plate, and the other end of the connecting shaft extends to protrude from the first clamping plate;

[0011] The driving structure comprises a top plate which is rotatable relative to the first clamping plate, and the top plate comprises a cam portion which abuts against one end of the connecting shaft.

[0012] In some embodiments of the clamp, the first clamping plate includes a plate body and a retaining ring, the plate body is provided with a through hole, and the retaining ring is coaxially fixed in the through hole;

[0013] The elastic connection structure comprises a connecting shaft and an elastic member, the connecting shaft is movably received in the through hole, the connecting shaft comprises a first shaft body and a second shaft body, one end of the first shaft body is fixedly connected to the second clamping plate, one end of the first shaft body extends circumferentially to form the second shaft body, and the second shaft body at least partially protrudes from the first clamping plate; the elastic member is received in the through hole and is located between the second shaft body and the retaining ring;

[0014] The driving structure includes a top plate that can rotate relative to the first clamping plate, and the top plate includes a cam portion that abuts against the second shaft body.

[0015] In some embodiments of the clamp, the top plate is divided into the cam portion and the rotating portion along its rotation axis, and the length of the rotating portion is greater than the length of the cam portion.

[0016] In some embodiments of the clamp, the rotation axis intersects the central axis of the connecting shaft at right angles.

[0017] In some embodiments of the clamp, the first clamp has a side wall and a first holding edge protruding from one end of the side wall away from the second clamp; the second clamp has a second holding edge protruding from the side wall and arranged opposite to the first holding edge, and the first holding edge, the side wall and the second holding edge constitute a holding groove.

[0018] In some embodiments of the clamp, the retaining groove is an arc-shaped structure.

[0019] In some embodiments of the clamp, the driving structure also includes a fixed component and a rotating component, the fixed component includes a first fixed plate and a second fixed plate fixed on the first clamping plate with relative intervals, the rotating component includes a first rotating shaft fixed to the first fixed plate and a second rotating shaft fixed to the second fixed plate, the top plate is located between the first fixed plate and the second fixed plate, and the first rotating shaft is rotatably connected to the top plate, and the second rotating shaft is rotatably connected to the top plate.

[0020] In some embodiments of the clamp, the rotating part has a first limiting notch and a second limiting notch, the first fixing plate includes a first fixing part and a first limiting part, the second fixing plate includes a second fixing part and a second limiting part, and the first fixing part and the second fixing part are both fixedly connected to the first clamping plate; when the top plate is reset, the first limiting part abuts against the first limiting notch, and the second limiting part abuts against the second limiting notch.

[0021] In some embodiments of the clamp, the first limiting portion and the second limiting portion are elastic.

[0022] The embodiments of the present invention have the following beneficial effects:

[0023] In the present invention, when the second splint makes a first movement, the spacing distance between the second splint and the first splint gradually increases to clamp or unload the denture material; when the second splint makes a second movement, the spacing distance between the second splint and the first splint gradually decreases to clamp the denture material; the elastic connection structure is connected between the first splint and the second splint, and the driving structure can overcome the elastic connection force of the elastic connection structure to drive the second splint to make a first movement, at this time, the distance between the first splint and the second splint increases; when the driving structure is reset, the elastic connection structure makes a return movement to make the second splint make a second movement, at this time, the distance between the first splint and the second splint decreases. The technical solution keeps the first splint and the second splint elastically connected at all times through the elastic connection structure, and the second splint can be switched between the first movement and the second movement through the cooperation of the driving structure and the elastic connection structure, thereby realizing the clamping, clamping and unloading operations of the denture material, and the use of the technical solution solves the technical problem of low reliability and convenience of the clamp in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] in:

[0026] Figure 1 A schematic diagram showing a state of a clamp provided according to an embodiment of the present invention is shown;

[0027] Figure 2 A schematic diagram showing another state of a clamp provided according to an embodiment of the present invention is shown;

[0028] Figure 3A schematic diagram of the exploded structure of a clamp provided according to an embodiment of the present invention is shown;

[0029] Figure 4 Shows Figure 1 A cross-sectional view of

[0030] Figure 5 Shows Figure 2 sectional view of .

[0031] Description of main component symbols:

[0032] 100, clamp; 10, first clamp; 11, plate body; 111, through hole; 112, side wall; 113, first holding edge; 12, retaining ring; 13, mounting block; 131, mounting hole; 20, second clamp; 21, second holding edge; 30, elastic connection structure; 31, connecting shaft; 311, first shaft body; 322, second shaft body; 32, elastic member; 41, top plate; 411, cam part; 412, rotating part; 4121, first limiting notch; 4122, second limiting notch; 42, fixing assembly; 421, first fixing plate; 4211, first fixing part; 4212, first limiting part; 422, second fixing plate; 4221, second fixing part; 4222, second limiting part; 423, connecting plate; 431, first rotating shaft; 432, second rotating shaft; 50, fixing groove. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many other different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] See also Figure 1-Figure 5 In an embodiment of the present invention, a clamp 100 is provided to realize a clamping function; in this embodiment, clamping of denture material is taken as an example for explanation. The clamp 100 includes a first clamping plate 10, a second clamping plate 20, an elastic connection structure 30 and a driving structure.

[0037] The second clamping plate 20 can make a first movement away from the first clamping plate 10 and a second movement towards the first clamping plate 10; the elastic connecting structure 30 is connected between the first clamping plate 10 and the second clamping plate 20; the driving end of the driving structure acts on the second clamping plate 20; wherein the driving structure can overcome the elastic connecting force of the elastic connecting structure 30 to make a driving movement, and the driving movement drives the second clamping plate 20 to make a first movement; when the driving structure is reset, the elastic connecting structure 30 can make a restoring movement, and the restoring movement drives the second clamping plate 20 to make a second movement.

[0038] In the present invention, when the second splint 20 makes a first movement, the spacing distance between the second splint 20 and the first splint 10 gradually increases to clamp or unload the denture material; when the second splint 20 makes a second movement, the spacing distance between the second splint 20 and the first splint 10 gradually decreases to clamp the denture material; the elastic connecting structure 30 is connected between the first splint 10 and the second splint 20, and the driving structure can overcome the elastic connecting force of the elastic connecting structure 30 to make a driving movement to drive the second splint 20 to make a first movement, at which time, the distance between the first splint 10 and the second splint 20 increases; when the driving structure is reset, the elastic connecting structure 30 makes a restoring movement to make the second splint 20 make a second movement, at which time the distance between the first splint 10 and the second splint 20 decreases. The present technical solution uses an elastic connection structure 30 to keep the first splint 10 and the second splint 20 always elastically connected, and the cooperation of the driving structure and the elastic connection structure 30 can enable the second splint 20 to switch between the first movement and the second movement, thereby realizing operations such as clamping, clamping and unloading of the denture material. The use of the present technical solution solves the technical problem of low reliability and convenience of the clamp 100 in the prior art.

[0039] It should be noted that the driving end of the driving structure acts on the second clamping plate 20 , which means that the driving end of the driving structure can act on the second clamping plate 20 directly or indirectly.

[0040] In one embodiment, the first clamping plate 10 is provided with a through hole 111; the elastic connection structure 30 includes a connecting shaft 31 and an elastic member 32, the elastic member 32 is connected between the first clamping plate 10 and the second clamping plate 20, the connecting shaft 31 is movably accommodated in the through hole 111, one end of the connecting shaft 31 extends to protrude from the first clamping plate 10, and the other end of the connecting shaft 31 extends out of the through hole 111 to be fixedly connected to the second clamping plate 20; the driving structure includes a top plate 41 that can rotate relative to the first clamping plate 10, and the top plate 41 includes a cam portion 411 that abuts against one end of the connecting shaft 31.

[0041] The elastic member 32 realizes the connection between the first clamp plate 10 and the second clamp plate 20, and allows the second clamp plate 20 to move relative to the first clamp plate 10; one end of the connecting shaft 31 protrudes from the first clamp plate 10, and the other end of the connecting shaft 31 is fixedly connected to the second clamp plate 20. Therefore, by reducing the protrusion of one end of the connecting shaft 31, the distance between the second clamp plate 20 and the first clamp plate 10 can be increased, that is, the driving structure can indirectly act on the second clamp plate 20 through the connecting shaft 31. Specifically, when the driving structure makes a driving movement, that is, the top plate 41 rotates, the cam portion 411 rotates accordingly to increase the pressure acting on one end of the connecting shaft 31, driving the second splint 20 to make a first movement to increase the spacing distance between the second splint 20 and the first splint 10, so as to clamp or unload the denture material, and at this time the elastic member 32 is stretched; when the driving structure is reset, that is, the pressure of the cam portion 411 acting on one end of the connecting shaft 31 is reduced or cancelled, at this time, the stretched elastic member 32 makes a restoring movement, and the elastic restoring force of the elastic member 32 pulls the second splint 20 to make a second movement, so as to reduce the spacing distance between the second splint 20 and the first splint 10, and clamp the denture material.

[0042] In some specific embodiments, the elastic member 32 is a butterfly spring to achieve a constant elastic restoring force.

[0043] In one embodiment, the first clamping plate 10 includes a plate body 11 and a retaining ring 12, the plate body 11 is provided with a through hole 111, and the retaining ring 12 is coaxially fixed in the through hole 111; the elastic connection structure 30 includes a connecting shaft 31 and an elastic member 32, the connecting shaft 31 is movably accommodated in the through hole 111, the connecting shaft 31 includes a first shaft body 311 and a second shaft body 322, one end of the first shaft body 311 is fixedly connected to the second clamping plate 20, and the other end of the first shaft body 311 extends circumferentially to form a second shaft body 322, and the second shaft body 322 at least partially protrudes from the first clamping plate 10; the elastic member 32 is accommodated in the through hole 111 and is located between the second shaft body 322 and the retaining ring 12; the driving structure includes a top plate 41 that can rotate relative to the first clamping plate 10, and the top plate 41 includes a cam portion 411 that abuts against the second shaft body 322.

[0044] In this embodiment, the connecting shaft 31 can be movably received in the through hole 111, and the second clamping plate 20 and the connecting shaft 31 are fixedly connected by the first shaft body 311, and the elastic member 32 is located between the first shaft body 311 and the retaining ring 12, so as to realize the elastic connection between the second clamping plate 20 and the first clamping plate 10; and the second shaft body 322 of the connecting shaft 31 at least partially protrudes from the first clamping plate 10, therefore, by increasing or decreasing the protrusion amount of the second shaft body 322 relative to the first clamping plate 10, that is, the driving structure can indirectly act on the second clamping plate 20 through the connecting shaft 31 so that the distance between the second clamping plate 20 and the first clamping plate 10 is increased; specifically, when the driving structure acts as a driving When the driving structure is in motion, that is, the top plate 41 rotates, the cam portion 411 rotates accordingly to increase the pressure acting on one end of the connecting shaft 31, driving the second splint 20 to make a first movement to increase the spacing distance between the second splint 20 and the first splint 10, so as to clamp or unload the denture material, and the elastic member 32 is compressed at this time; when the driving structure is reset, that is, the pressure of the cam portion 411 on one end of the connecting shaft 31 is reduced or cancelled, at this time, the compressed elastic member 32 makes a restoring movement, and the elastic restoring force of the elastic member 32 drives the second splint 20 to make a second movement to reduce the spacing distance between the second splint 20 and the first splint 10, and clamp the denture material.

[0045] In some specific embodiments, the elastic member 32 is a butterfly spring to achieve a constant elastic restoring force; in addition, the elastic member 32 is sleeved on the first shaft 311, and the first shaft 311 stably supports the deformation of the elastic member 32.

[0046] The technical solution drives the second splint 20 to make the second movement through the restoring movement of the elastic member 32. When the thickness of the clamped denture material is constant, the deformation of the elastic member 32 is also constant. Therefore, the clamping force of the second splint 20 on the denture material of the same thickness is also constant. The second splint 20 is pushed open by the cam portion 411. Therefore, the pushing distance of the second splint 20 relative to the first splint 10 is also constant.

[0047] In one embodiment, see Figure 3, the top plate 41 is divided into a cam portion 411 and a rotating portion 412 along its rotation axis, and the length of the rotating portion 412 is greater than the length of the cam portion 411. When the top plate 41 rotates through the cam portion 411 to drive the second clamping plate 20, it is necessary to overcome the elastic connection force of the elastic member 32 to do work. Therefore, the driving force for driving the cam portion 411 to rotate is relatively large, and it is difficult to directly push open the second clamping plate 20 when clamping or unloading the denture material. Based on this problem, this embodiment uses the principle of a lever to divide the top plate 41 along its rotation axis into a cam portion 411 and a rotating portion 412, so that the length of the rotating portion 412 is greater than the length of the cam portion 411. The larger the ratio of the length of the rotating portion 412 to the cam portion 411, the smaller the force applied to the rotating portion 412, and the cam portion 411 can be easily driven to rotate, further improving the convenience of the clamp 100.

[0048] In some specific embodiments, the rotation axis intersects perpendicularly with the central axis of the connecting shaft 31 , so that the cam portion 411 is always stably in contact with the second shaft body 322 , thereby ensuring the stability of clamping and unloading of the clamp 100 .

[0049] In one embodiment, see Figure 1-Figure 3 The plate body 11 has a side wall 112 and a first holding edge 113 formed by protruding from one end of the side wall 112 away from the second clamping plate 20; the second clamping plate 20 has a second holding edge 21 protruding from the side wall 112 and arranged opposite to the first holding edge 113, and the first holding edge 113, the side wall 112 and the second holding edge constitute a holding groove 50. The side wall 112 of the first clamping plate 10 is used to form a clamping space for clamping the denture material, and the first holding edge 113 of the first clamping plate 10 and the second holding edge 21 of the second clamping plate 20 are arranged opposite to each other to clamp the denture material, so that when clamping and unloading the denture material, the distance that the cam portion 411 pushes the second clamping plate 20 can be reduced, that is, the length of the cam portion 411 can be reduced.

[0050] Based on the shape of the denture material, the retaining groove 50 is configured as an arc-shaped structure, so that the clamp 100 can stably clamp the denture material, and the clamping force of the clamp 100 acts evenly on the denture material.

[0051] In some specific embodiments, the arc length of the retaining groove 50 is 2πr×1 / 3, where r is the radius of the arc-shaped retaining groove 50; that is, a circle is made with the radius r of the arc-shaped retaining groove 50, and the clamping range of the clamp 100 is approximately one-third of the circumference of the circle.

[0052] In one embodiment, see Figure 3The driving structure also includes a fixed component 42 and a rotating component. The fixed component 42 includes a first fixed plate 421 and a second fixed plate 422 fixed on the first clamping plate 10 with relative spacing. The rotating component includes a first rotating shaft 431 fixed to the first fixed plate 421 and a second rotating shaft 432 fixed to the second fixed plate 422. The top plate 41 is located between the first fixed plate 421 and the second fixed plate 422, and the first rotating shaft 431 is rotatably connected to the top plate 41, and the second rotating shaft 432 is rotatably connected to the top plate 41.

[0053] It should be noted that the first rotating shaft 431 can be rotatably connected to the first fixing plate 421 and fixedly connected to the top plate 41 ; the second rotating shaft 432 can be rotatably connected to the second fixing plate 422 and fixedly connected to the top plate 41 .

[0054] In some specific embodiments, the fixing assembly 42 also includes a connecting plate 423 connected between the first fixing plate 421 and the second fixing plate 422. When the top plate 41 is not driven to move, the rotating portion 412 is in contact with the plate surface of the connecting plate 423, and the end face of the second shaft 322 is flush with the plate surface, that is, the rotation range of the top plate 41 is limited by the connecting plate 423.

[0055] In one implementation, see Figure 1 and Figure 3 The rotating part 412 has a first limiting notch 4121 and a second limiting notch 4122, the first fixing plate 421 includes a first fixing part 4211 and a first limiting part 4212, the second fixing plate 422 includes a second fixing part 4221 and a second limiting part 4222, and the first fixing part 4211 and the second fixing part 4221 are both fixedly connected to the first clamping plate 10; when the top plate 41 is reset, the first limiting part 4212 abuts against the first limiting notch 4121, and the second limiting part 4222 abuts against the second limiting notch 4122. That is, when the first clamping plate 10 and the second clamping plate 20 clamp the denture material to each other, the first limiting part 4212 and the second limiting part 4222 work together to keep the top plate 41 in the reset (initial) state.

[0056] In some specific embodiments, the first limiting portion 4212 and the second limiting portion 4222 are elastic. The elastic first limiting portion 4212 and the second limiting portion 4222 can keep the top plate 41 stable in a state of not being driven, and can also achieve driving movement.

[0057] In some specific embodiments, there are at least two through holes 111 symmetrically distributed about the symmetry axis of the arc-shaped retaining groove 50 ; correspondingly, there are at least two elastic members 32 and cam portions 411 ; so as to further improve the movement stability of the second clamping plate 20 relative to the first clamping plate 10 .

[0058] In one embodiment, a receiving groove is provided on the board surface opposite to the first splint 10 and the second splint 20, and the second splint 20 is located in the receiving groove to limit the position of the second splint 20 relative to the first splint 10 and improve the stability of the second splint 20 relative to the first splint 10.

[0059] In one embodiment, the first clamping plate 10 further includes a mounting block 13 for fixing the clamp 100 , and the mounting block 13 is provided with a mounting hole 131 .

[0060] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A clamp, characterized in that: include: First splint; A second clamping plate, the second clamping plate can make a first movement away from the first clamping plate and a second movement toward the first clamping plate; a receiving groove is provided on a plate surface opposite to the first clamping plate and the second clamping plate is located in the receiving groove; An elastic connection structure connected between the first clamping plate and the second clamping plate; and a driving structure, wherein a driving end of the driving structure acts on the second clamping plate; Wherein, the driving structure is capable of overcoming the elastic connection force of the elastic connection structure to perform a driving movement, and the driving movement drives the second clamping plate to perform the first movement; When the driving structure is reset, the elastic connection structure can perform a restoring movement, and the restoring movement drives the second clamping plate to perform a second movement; The first clamping plate is provided with a through hole; The elastic connection structure includes a connection shaft and an elastic member, wherein the elastic member is connected between the first clamping plate and the second clamping plate, the connection shaft is movably received in the through hole, one end of the connection shaft extends out of the through hole to be fixedly connected to the second clamping plate, and the other end of the connection shaft extends to protrude from the first clamping plate; The driving structure comprises a top plate which is rotatable relative to the first clamping plate, and the top plate comprises a cam portion which abuts against one end of the connecting shaft.

2. The clamp according to claim 1, characterized in that: The first clamping plate includes a plate body and a retaining ring, the plate body is provided with a through hole, and the retaining ring is coaxially fixed in the through hole; The elastic connection structure comprises a connecting shaft and an elastic member, the connecting shaft is movably received in the through hole, the connecting shaft comprises a first shaft body and a second shaft body, one end of the first shaft body is fixedly connected to the second clamping plate, one end of the first shaft body extends circumferentially to form the second shaft body, and the second shaft body at least partially protrudes from the first clamping plate; the elastic member is received in the through hole and is located between the second shaft body and the retaining ring; The driving structure includes a top plate that can rotate relative to the first clamping plate, and the top plate includes a cam portion that abuts against the second shaft body.

3. The clamp according to claim 2, characterized in that: The top plate is divided into the cam portion and the rotating portion along the rotation axis thereof, and the length of the rotating portion is greater than the length of the cam portion.

4. The clamp according to claim 3, characterized in that: The rotation axis intersects the central axis of the connecting shaft perpendicularly.

5. The clamp according to claim 1, characterized in that: The first clamping plate has a side wall and a first retaining edge protruding from one end of the side wall away from the second clamping plate; the second clamping plate has a second retaining edge protruding from the side wall and arranged opposite to the first retaining edge, and the first retaining edge, the side wall and the second retaining edge constitute a retaining groove.

6. The clamp according to claim 5, characterized in that: The retaining groove is an arc-shaped structure.

7. The clamp according to claim 3, characterized in that: The driving structure also includes a fixed component and a rotating component, the fixed component includes a first fixed plate and a second fixed plate fixed on the first clamping plate with relative spacing, the rotating component includes a first rotating shaft fixed to the first fixed plate and a second rotating shaft fixed to the second fixed plate, the top plate is located between the first fixed plate and the second fixed plate, the first rotating shaft is rotatably connected to the top plate, and the second rotating shaft is rotatably connected to the top plate.

8. The clamp according to claim 7, characterized in that: The rotating part has a first limiting notch and a second limiting notch, the first fixing plate includes a first fixing part and a first limiting part, the second fixing plate includes a second fixing part and a second limiting part, and the first fixing part and the second fixing part are both fixedly connected to the first clamping plate; when the top plate is reset, the first limiting part abuts against the first limiting notch, and the second limiting part abuts against the second limiting notch.

9. The clamp according to claim 8, characterized in that The first limiting portion and the second limiting portion are elastic.

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