Shearing and prying tool

Abstract

The invention relates to the technical field of manual hardware tools, in particular to a shearing prying tool which comprises a movable handle, a fixed jaw and a fixed handle, one end of the fixed jaw is hinged to the middle, close to the supporting end, of the fixed handle, and a positioning structure is assembled between the fixed jaw and the fixed handle. Any main body of the fixed jaw and the fixed handle is continuously connected with the positioning structure, and the positioning structure is selectively connected with or separated from the other main body, so that the fixed jaw is fixedly connected with or separated from the fixed handle, and the other end of the fixed jaw is hinged with one end of the movable handle; and the hinged ends of the fixed jaw and the movable handle are respectively provided with tong heads which are mutually matched for opening and closing. By adjusting the connecting position of the positioning structure relative to the fixed jaw and the fixed handle, flexible switching between the shearing function and the prying function can be achieved, and the multifunctional prying device has the advantages of being efficient in function integration, convenient and fast to operate, stable and reliable in structure and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of manual hardware tools, in particular to a quick shearing and prying device. BACKGROUND

[0002] In daily work scenes such as mechanical maintenance, home installation and handcrafting, shearing tools are indispensable basic tools.

[0003] In the prior art, common shearing tools are nutcrackers and wire clippers, which mainly rely on the biting action of the jaw to achieve the shearing function of metal wires, small pipes, nut shells and other workpieces, and can play an important role in specific work requirements. However, the shearing tools on the market generally have the problem of single function, which can only meet the shearing requirement and cannot adapt to complex and diverse actual work scenes. For example, when the work process needs to pull out nails, disassemble small parts or separate workpieces attached to the operation surface, the traditional shearing tool cannot play a role: if the sharp part of the shearing tool is forced to align with the nail or the edge of the workpiece, the target object needs to be clamped first, and then the nail or the workpiece is pulled out or separated by slowly rotating or repeatedly applying force. Not only is the operation difficult, but the tool is also likely to slip and the target object is deformed due to uneven force, and even the operator's hand is injured. This "single tool for single requirement" situation makes the operator need to frequently change tools during the work process, which not only increases the tool carrying cost, but also wastes a lot of time due to tool switching, resulting in a significant reduction in work efficiency. Especially in scenes with narrow space and complex work environment, the limitations of traditional single-function tools are more prominent, and it is difficult to meet the efficient and convenient work requirements.

[0004] Therefore, it is an urgent need to develop a multifunctional integrated tool that can not only achieve stable shearing function but also quickly complete prying work to solve the current work pain points and improve work efficiency. SUMMARY

[0005] The purpose of the present application is to provide a shearing and prying tool to solve the problem that the tools in the prior art cannot perform shearing and prying work, have single function and poor flexibility.

[0006] The embodiments of the present application can be implemented by the following technical solutions: A shearing and prying tool, comprising a fixed jaw and a fixed handle, one end of the fixed jaw is hinged to the middle near the support end of the fixed handle, any main body of the fixed jaw and the fixed handle is in continuous connection with a positioning structure, and the positioning structure is selectively connected or separated from the other main body, so as to realize the fixed connection or separation of the fixed jaw and the fixed handle. Further, the fixed handle is adjacent to one end of the jaw of the fixed jaw, and the positioning structure changes its connection position relative to the fixed jaw and the fixed handle through sliding displacement, and realizes function conversion in two different states.

[0007] Further, the fixed handle is adjacent to one end of the jaw of the fixed jaw, and the positioning structure changes its connection position relative to the fixed jaw and the fixed handle through sliding displacement, and realizes function conversion in two different states.

[0008] Further, when the fixed jaw is fixedly connected as a whole through the positioning structure, the movable handle and the fixed handle are opened and closed with the hinge point of the two as the fulcrum, driving the jaw of the fixed jaw and the jaw of the movable handle to be synchronized to clamp or separate; When the locking of the positioning structure is released, the fixed handle and the fixed handle are separated and moved, and when the fixed handle and the fixed handle are pressed together, the supporting end of the fixed handle is displaced to abut against the operating surface with the hinge point of the fixed handle and the fixed jaw as the fulcrum, and the movable handle takes the contact point of the supporting end of the fixed handle and the operating surface as a new fulcrum, and the jaw pries the workpiece from the operating surface through the leverage force.

[0009] Further, the fixed jaw includes a first slot, and the fixed handle includes a second slot, the first slot and the second slot are long slots extending in the same direction, and the second slot is open on one side along its extension direction, and the positioning structure is limited in the first slot and the second slot and slides in the common extension direction of the two long slots.

[0010] Further, the second slot is protruded from the top wall of the fixed handle as a whole, the top wall of the fixed handle extends obliquely upward, and the open side end of the second slot is lower than the height of the top wall of the fixed handle.

[0011] Further, along the X-axis direction, a first insertion hole is arranged between the two hinge points of the fixed jaw, a second insertion hole corresponding to the first insertion hole is arranged on the movable handle, a first torsional spring is connected at the hinge point of the fixed jaw and the movable handle, and the two torsional arms of the first torsional spring are respectively inserted and limited in the first insertion hole and the second insertion hole.

[0012] Further, the proximal supporting end of the fixed handle is provided with a third insertion hole, and a second torsional spring is connected at the hinge point of the fixed jaw and the fixed handle, and the two torsional arms of the second torsional spring are respectively inserted and limited in the first insertion hole and the third insertion hole.

[0013] Further, the fixed jaw is arranged between the movable handle and the fixed handle along the Y-axis direction, and the axes of the first, second and third insertion holes are arranged in a straight line along the Z-axis direction.

[0014] Further, the supporting end of the fixed handle is provided with a protruding portion in the pulling direction away from the fixed handle.

[0015] Further, the jaw of the fixed jaw, the jaw of the movable handle and the protruding portion of the fixed handle extend in the same direction, the jaw of the fixed jaw is bent towards the side where the positioning structure is located, the jaw of the movable handle is bent away from the side where the positioning structure is located, the two jaws form an adaptive biting angle through reverse bending, and the jaws of the fixed jaw and the movable handle extend to the same plane along the Y-axis direction to jointly form a size-adjustable clamping opening.

[0016] The shear prying tool provided by the embodiment of the application has at least the following beneficial effects: On the one hand, the embodiment of the application switches the mode by changing the connection position only through the hinge design of the fixed jaw and the movable handle and the fixed handle and the position adjustment of the positioning structure, without disassembling the components, so that the shear and prying dual functions can be switched, the jaws are reversely bent to adapt to the biting, and the lever action of the hinge structure can effectively reduce the operation force, and the embodiment has the advantages of high function integration, convenient operation and labor saving.

[0017] On the other hand, the two torsional springs are limited by the corresponding insertion holes, can accurately transmit the elastic force, avoid the torsional spring from deviating and dislocating, ensure the structural stability, store the elastic potential energy when the components relatively rotate, drive the jaws to reset after shearing and assist the handle to return to the normal position after prying, reduce the manual reset operation, reduce the operation strength, improve the use convenience, and have the advantages of practicality and compactness. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a plan view of the shear prying tool according to the application; Figure 2 、 Figure 3 FIGS. 2 and 3 are schematic diagrams of the application scenarios of the shear prying tool according to the application in different states; Figure 4 FIG. 4 is a structural schematic diagram of the fixed jaw according to the application; Figure 5 FIG. 5 is a structural schematic diagram of the movable handle according to the application; Figure 6 FIG. 6 is a structural schematic diagram of the fixed handle according to the application; Figure 7A structural schematic diagram of a positioning structure in the present application; Figure 8 A structural schematic diagram of a limiting component in the present application.

[0019] Reference numerals in the drawings 1 - movable handle; 10 - third hinge hole; 12 - second insertion hole; 2 - fixed jaw; 20 - first hinge hole; 21 - first slot; 22 - first insertion hole; 23 - second hinge hole; 3 - fixed handle; 31 - second slot; 32 - third insertion hole; 33 - fourth hinge hole; 34 - protruding part; 4 - positioning structure; 41 - internally threaded hole; 5 - limiting component; 6 - first fixed part; 7 - first torsional spring; 8 - second fixed part; 9 - second torsional spring. DETAILED DESCRIPTION

[0020] Hereinafter, the present application will be further described based on preferred embodiments and with reference to the drawings.

[0021] In addition, for the convenience of understanding, various components on the drawings are enlarged or reduced, but such practice is not intended to limit the protection scope of the present application.

[0022] The singular form also includes the plural meaning, and vice versa.

[0023] In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the embodiments of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, in the description of the present application, in order to distinguish different units, the first, second and the like are used in the specification, but these are not limited by the order of manufacture, and cannot be understood as indicating or implying relative importance, and the names may be different in the detailed description and claims of the present application.

[0024] The words in the specification are used to illustrate the embodiments of the present application, but are not intended to limit the present application. It should be noted that, unless otherwise explicitly specified and limited, if the terms "provided", "connected", "connected" appear, they should be interpreted broadly, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, can be directly connected, or indirectly connected through an intermediate medium; can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be specifically understood.

[0025] For the sake of subsequent clear description of the relative position relationship, motion trajectory and stress direction of each component of the tool, a three-dimensional coordinate system is established uniformly for the description, the axis direction of the third hinge hole 10 is positioned as the Y-axis direction (i.e. the horizontal transverse extension direction of the hinge shaft), in the same horizontal plane as the Y-axis, the direction perpendicular to the Y-axis is defined as the X-axis (mainly corresponding to the length extension direction of the tool handle), the downward pressing operation direction of the movable handle 1 in the shearing or prying operation, and the lifting operation direction of the fixed handle 3 in the prying operation are collectively defined as the Z-axis direction, and the Z-axis is perpendicular to the XY plane composed of the X-axis and the Y-axis.

[0026] As shown in Figures 1 to 3 , a shearing and prying tool includes a movable handle 1, a fixed jaw 2 and a fixed handle 3, one end of the fixed jaw 2 is hinged to the middle near the support end of the fixed handle 3 (referring to the middle region of the overall length direction and close to the position of the support end of the fixed handle 3), a positioning structure 4 is assembled between the fixed jaw 2 and the fixed handle 3, by changing the connection position of the positioning structure 4 with the fixed jaw 2 and the fixed handle 3, the fixed jaw 2 and the fixed handle 3 are fixedly connected or separated, for realizing the switching of the tool function, the other end of the fixed jaw 2 is hinged to one end of the movable handle 1, the hinge ends of the fixed jaw 2 and the movable handle 1 are respectively provided with jaw heads that open and close with each other, and the clamping or shearing function is realized through the opening and closing action.

[0027] In some preferred embodiments, the fixed handle 3 is adjacent to one end of the jaw head of the fixed jaw 2 as a support end, the positioning structure 4 changes its connection position relative to the fixed jaw 2 and the fixed handle 3 through sliding displacement, and realizes the conversion of the two different states.

[0028] In some preferred embodiments, when the fixed jaw 2 is fixedly connected as a whole through the positioning structure 4, the movable handle 1 and the fixed handle 3 perform opening and closing operations with the hinge point of the two as the fulcrum, the jaw head of the fixed jaw 2 and the jaw head of the movable handle 1 are synchronous to engage or separate, for serving as a shearing tool; when the positioning structure 4 is unlocked to separate the fixed jaw 2 from the fixed handle 3, the fixed handle 3 is lifted and the movable handle 1 is pressed against the fixed handle 3, the support end of the fixed handle 3 is reversely displaced to abut against the operating surface (ground, workbench surface) with the hinge point of the fixed handle 3 and the fixed jaw 2 as the fulcrum, the movable handle 1 takes the contact point of the support end of the fixed handle 3 and the operating surface as a new fulcrum, and the jaw head makes the workpiece pry out from the operating surface through the lever action force, for serving as a prying tool.

[0029] Specifically, as shown in Figure 4 , Figure 6As shown, in order to realize the fixed jaw 2 and the fixed handle 3 fixed / separation state switching, the fixed jaw 2 and the fixed handle 3 are respectively provided with a notch structure matched with the positioning structure 4, wherein the fixed jaw 2 includes a first notch 21, and the fixed handle 3 includes a second notch 31, the first notch 21 and the second notch 31 are long strip-shaped grooves extending in the same direction, and the second notch 31 is open on one side along the extending direction, which provides the necessary space for the sliding and state switching of the positioning structure 4, the positioning structure 4 is connected in the first notch 21 and the second notch 31, and slides and displaces along the common extending direction of the two long grooves, when the positioning structure 4 slides to the overlapping locking area of the first notch 21 and the second notch 31, the fixed jaw 2 and the fixed handle 3 can be tightly fixed, realizing the switching of the shearing mode; when the positioning structure 4 slides to the open side or the non-locking area of the second notch 31 along the long groove, the constraint between the fixed jaw 2 and the fixed handle 3 is released, and they can freely move relative to each other, and then switch to the prying mode.

[0030] In some preferred embodiments, as shown in Figure 6 As shown, the second notch 31 protrudes from the top wall of the fixed handle 3, the top wall of the fixed handle 3 extends upwardly, and the open side end of the second notch 31 is lower than the height of the top wall of the fixed handle 3, so that the top wall of the fixed handle 3 and the open side end of the second notch 31 form a natural height difference structure, which can be used as a limiting protrusion to physically block the positioning structure 4 sliding to the open side, which can not only ensure the sliding flexibility of the positioning structure 4 when switching the mode, but also effectively limit the sliding stroke, prevent the positioning structure 4 from being separated from the notch due to improper operation, and improve the reliability and safety during tool use.

[0031] In some preferred embodiments, as shown in Figure 7 , Figure 8As shown, the positioning structure 4 is a latch structure, one end of which is integrally formed with an enlarged end, and the other end is provided with an internal threaded hole 41 along the axis, and when assembling, the side of the positioning structure 4 without the enlarged end is sequentially inserted through the first notch 21 and the second notch 31, and then one end of the limiting component 5 is screwed into the threaded hole 41, and the detachable fixed connection of the positioning structure 4 and the limiting component 5 is realized through threaded cooperation, preferably, the diameter of the enlarged end of the positioning structure 4 and the diameter of the head of the limiting component 5 are both greater than the width of the two long grooves, so that the enlarged end of the positioning structure 4 and the head of the limiting component 5 can be tightly abutted on the outside of the two ends of the long groove respectively, forming a bidirectional limiting structure, which not only does not affect the flexible sliding of the positioning structure 4 along the extension direction of the long groove, but also effectively prevents the positioning structure 4 from falling out of the notch, further improving the stability of the assembly of the positioning structure 4 and the convenience of disassembly and maintenance.

[0032] In some preferred embodiments, as shown in Figure 6 As shown, the supporting end of the fixed handle 3 is provided with a protruding part 34 in the direction away from the lifting direction of the fixed handle 3, which is used to form a supporting structure matched with the operation surface, and when the tool is switched to the prying mode and the fixed handle 3 is lifted, the supporting end can quickly form stable abutment with the operation surface, increase the supporting contact area, avoid the supporting end sinking into the operation surface or slipping due to force concentration, and at the same time, through reasonable extension length optimization of the lever arm, the operator only needs small force to pry the workpiece, which significantly reduces the physical consumption of prying operation.

[0033] In some preferred embodiments, as shown in Figure 4 、 Figure 5 As shown, along the X-axis direction, the two ends of the fixed jaw 2 are respectively provided with a first hinge hole 20 and a second hinge hole 23, and a first insertion hole 22 is arranged between the first hinge hole 20 and the second hinge hole 23, correspondingly, the top of the jaw of the movable handle 1 is provided with a third hinge hole 10 corresponding to the first hinge hole 20, and the movable handle 1 is further provided with a second insertion hole 12 corresponding to the first insertion hole 22, and the first hinge hole 20 and the third hinge hole 10 realize the hinge connection of the fixed jaw 2 and the movable handle 1 through a first fixing part 6, which ensures that the two can flexibly rotate around the first fixing part 6, preferably, the first fixing part 6 is a rivet.

[0034] In some preferred embodiments, as shown in Figure 1 、 Figure 4 、 Figure 5As shown, the first fixed part 6 is connected with the coil (middle spiral part) of the first torsion spring 7, and the two torsion arms (end extended straight section) of the first torsion spring 7 are respectively inserted into and limited in the first insertion hole 22 and the second insertion hole 12, so as to provide the fixed jaw 2 and the movable handle 1 with continuous elastic force by using the elastic reset characteristics of the first torsion spring 7. When the movable handle 1 and the fixed jaw 2 are relatively opened and closed by external force, and the external force is removed, the first torsion spring 7 can automatically reset the two to the initial state by restoring the deformation of itself, which not only avoids the random opening and closing of the tool head due to gravity, but also reduces the hand force during operation, and improves the convenience and continuity of tool use.

[0035] In some preferred embodiments, the middle part of the fixed handle 3 is provided with a fourth hinge hole 33 corresponding to the second hinge hole 23, and the fixed jaw 2 and the fixed handle 3 are hinged by the second fixed part 8, so that the two can be flexibly rotated around the second fixed part 8. Preferably, the second fixed part 8 is a rivet.

[0036] In some preferred embodiments, as shown in Figure 1 、 Figure 6 As shown, the proximal support end of the fixed handle 3 is provided with a third insertion hole 32, and the second fixed part 8 is connected with the coil (middle spiral part) of the second torsion spring 9, and the two torsion arms (end extended straight section) of the second torsion spring 9 are respectively inserted into and limited in the first insertion hole 22 of the fixed jaw 2 and the third insertion hole 32 of the fixed handle 3. When the fixed jaw 2 and the fixed handle 3 are relatively rotated around the second fixed part 8 (such as the process of switching the tool from the shearing mode to the prying mode), the second torsion spring 9 will be deformed and store elastic potential energy with the change of the angle of the two; after the external force is removed, the second torsion spring 9 can drive the fixed jaw 2 and the fixed handle 3 to automatically reset to the initial relative position by the elastic restoring force, which not only ensures the structural stability after mode switching, but also avoids the random shaking of the components due to gravity, and further improves the smoothness and convenience of tool operation.

[0037] In some preferred embodiments, the fixed jaw 2 is arranged between the movable handle 1 and the fixed handle 3 along the Y-axis direction, the axes of the first insertion hole 22, the second insertion hole 12 and the third insertion hole 32 are arranged along the Y-axis and linearly arranged along the Z-axis direction, so that the elastic force directions of the two torsion springs can be kept in the same vertical plane, avoiding additional torque caused by the deviation of the force direction, thereby reducing unnecessary friction and loss between components; at the same time, the linearly arranged insertion holes can provide accurate guidance for the torsion arm, ensuring that the torsion arm is always subjected to force along the axis direction of the insertion hole during tool switching state or reset process, preventing the torsion arm from deforming or breaking due to force skew, and significantly improving the stability and reliability of the torsion spring work.

[0038] In some preferred embodiments, the jaw of the fixed jaw 2, the jaw of the movable handle 1 and the protruding part 34 of the fixed handle extend in the same direction, the jaw of the fixed jaw 2 is curved towards the side where the positioning structure 4 is located, the jaw of the movable handle 1 is curved away from the side where the positioning structure 4 is located, both of which form an adaptive bite angle by reverse bending, and the jaw of the fixed jaw 2 and the jaw of the movable handle 1 both extend to the same plane along the Y-axis direction, together forming a size-adjustable clamping opening.

[0039] When the tool is in the shearing mode, the reverse-bent jaws can realize stable clamping of workpieces such as wires and sheets through the precise fitting of the bite surface, avoiding workpiece slipping during shearing; and the design of extending to the same vertical plane along the Y-axis can ensure that the bite force of the jaws is concentrated in the same plane, reducing the loss of shearing force caused by misalignment and improving the shearing efficiency; in addition, when the tool is used to clamp small workpieces, the clamping opening can provide a stable holding space, cooperating with the auxiliary support of the protruding part 34 of the fixed handle 3, further enhancing the controllability of operation during operation.

[0040] The specific embodiments of the present application are described in detail above, and for those skilled in the art, without departing from the principles of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications also belong to the protection scope of the claims of the present application.

Claims

1. A shearing and prying tool, characterized in that: it comprises a fixed jaw (2) and a fixed handle (3), one end of the fixed jaw (2) is hinged to the middle near support end of the fixed handle (3), either of the main bodies of the fixed jaw (2) and the fixed handle (3) is kept in continuous connection with a positioning structure (4), the positioning structure (4) is selectively connected or separated from the other main body, so as to realize the fixed connection or separate activity of the fixed jaw (2) and the fixed handle (3); it further comprises a movable handle (1), the other end of the fixed jaw (2) is hinged to one end of the movable handle (1), and the hinged ends of the fixed jaw (2) and the movable handle (1) are respectively provided with jaw heads that are matched and opened and closed.

2. The shearing and prying tool according to claim 1, characterized in that: one end of the fixed jaw (2) adjacent to the jaw head of the fixed handle (3) is a support end, the positioning structure (4) changes its connection position relative to the fixed jaw (2) and the fixed handle (3) through sliding displacement, and realizes the function conversion in two different states.

3. The shearing and prying tool according to claim 2, characterized in that: when the fixed jaw (2) is fixedly connected as a whole through the positioning structure (4), the movable handle (1) and the fixed handle (3) are opened and closed with the hinge point of the two as the fulcrum, driving the jaw head of the fixed jaw (2) and the jaw head of the movable handle (1) to be synchronized to clamp or separate; when the positioning structure (4) is unlocked, the fixed jaw (2) and the fixed handle (3) are separated and active, when the fixed handle (3) is pulled and the movable handle (1) and the fixed handle (3) are pressed together, the support end of the fixed handle (3) is displaced to abut against the operating surface with the hinge point of the fixed handle (3) and the fixed jaw (2) as the fulcrum, the movable handle (1) takes the contact point of the support end of the fixed handle (3) and the abutment of the operating surface as a new fulcrum, and the jaw head is made to pry the workpiece from the operating surface through the lever action force.

4. The shearing and prying tool according to claim 2, characterized in that: the fixed jaw (2) comprises a first slot (21), the fixed handle (3) comprises a second slot (31), the first slot (21) and the second slot (31) are long slots extending in the same direction, and one side of the second slot (31) along its extension direction is in an open shape, the positioning structure (4) is limited in the first slot (21) and the second slot (31) and slides in the common extension direction of the two long slots.

5. The shearing and prying tool according to claim 4, characterized in that: the second slot (31) is entirely protruded from the top wall of the fixed handle (3), the top wall of the fixed handle (3) extends obliquely upward, and the open side end of the second slot (31) is lower than the height of the top wall of the fixed handle (3).

6. The shearing and prying tool according to claim 1, characterized in that: ​ ​ ​ ​ ​ ​ ​ The fixed jaw (2) is provided with a first insertion hole (22) between two hinge points in the X-axis direction, the movable handle (1) is provided with a second insertion hole (12) corresponding to the first insertion hole (22), and the fixed jaw (2) is connected with the movable handle (1) at the hinge point and connected with a first torsion spring (7), and the two torsion arms of the first torsion spring (7) are respectively inserted into and limited in the first insertion hole (22) and the second insertion hole (12).

7. The cutting prying tool according to claim 6, characterized in that: The fixed handle (3) is provided with a third insertion hole (32) at the proximal support end, the fixed jaw (2) is connected with the fixed handle (3) at the hinge point and connected with a second torsion spring (9), and the two torsion arms of the second torsion spring (9) are respectively inserted into and limited in the first insertion hole (22) and the third insertion hole (32).

8. The cutting prying tool according to claim 7, characterized in that: In the Y-axis direction, the fixed jaw (2) is arranged between the movable handle (1) and the fixed handle (3), the axes of the first insertion hole (22), the second insertion hole (12) and the third insertion hole (32) are arranged along the Y-axis and linearly arranged along the Z-axis direction.

9. The cutting prying tool according to claim 1, characterized in that: The support end of the fixed handle (3) is provided with a protruding part (34) in the pulling direction away from the fixed handle (3).

10. The cutting prying tool according to claim 9, characterized in that: The jaw of the fixed jaw (2), the jaw of the movable handle (1) and the protruding part (34) of the fixed handle (3) extend in the same direction, the jaw of the fixed jaw (2) is curved towards the side where the positioning structure (4) is located, the jaw of the movable handle (1) is curved away from the side where the positioning structure (4) is located, and the two are formed to have an adaptive occlusion angle by reverse bending, and the jaw of the fixed jaw (2) and the jaw of the movable handle (1) both extend to the same plane in the Y-axis direction, and jointly form a size-adjustable clamping opening.

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