CN219212345U - Clamp structure - Google Patents

Abstract

The utility model provides a clamp structure, it is used for centre gripping a work piece and includes a base and two interior claws. The two inner claws are arranged on the base, each inner claw is used for moving relative to the base so as to change a distance between the two inner claws, and each inner claw comprises at least one limiting inclined plane. When the two inner claws clamp a workpiece, the at least one limiting inclined surface of each inner claw protrudes into a limiting hole of the workpiece, and the distance between the two inner claws is changed, so that the at least one limiting inclined surface of each inner claw is used for tightly pressing the workpiece.

Description

Clamp structure

Technical Field

The present utility model relates to a clamping structure, and more particularly to a clamping structure for clamping and fixing a workpiece on a processing machine or a mechanical arm.

Background

In order to form a workpiece into a desired shape, a workpiece is generally machined by a machining machine, for example, a chuck is used for fixing the workpiece in a lathe, and a vice is used for fixing the workpiece in a milling machine. However, the clamping portions of the existing clamping heads or vice are all arranged outside the workpiece, so that the clamping heads or vice are not easy to process at partial positions. In addition, when the size of the workpiece is reduced or the machining shape is complicated, the tool is liable to interfere with the chuck or the vice.

In view of this, it is an objective of related industries to improve the structure of a clamp such as a chuck or a vice to reduce interference.

Disclosure of Invention

In order to solve the above-mentioned problem, the present utility model provides a clamp structure, through its structural configuration, can reach the effect of reducing the interference.

According to one embodiment of the present utility model, a clamp structure is provided for clamping a workpiece and includes a base and two inner jaws. The two inner claws are arranged on the base, each inner claw is used for moving relative to the base so as to change a distance between the two inner claws, and each inner claw comprises at least one limiting inclined plane. When the two inner claws clamp a workpiece, the at least one limiting inclined surface of each inner claw protrudes into a limiting hole of the workpiece, and the distance between the two inner claws is changed, so that the at least one limiting inclined surface of each inner claw is used for tightly pressing the workpiece.

Therefore, the inner claw can protrude into the limiting hole of the workpiece, and the interference opportunity of the inner claw and the cutter can be reduced.

According to the above embodiment, the clamp structure may further comprise a moving mechanism, wherein the base comprises a track, and the moving mechanism is disposed in the track and comprises two sliding blocks and a screw. The two sliding blocks are respectively provided with the two inner claws, and the screw rod penetrates through the two sliding blocks to drive the two sliding blocks to move in the track, so that the two inner claws move relative to the base.

According to the above embodiment, the clamp structure may further comprise a moving mechanism, wherein the base comprises a track, and the moving mechanism is disposed in the track and comprises two sliding blocks and two screws. The two sliding blocks are respectively provided with the two inner claws, and the two screws respectively penetrate through the two sliding blocks to drive the two sliding blocks to move in the track, so that the two inner claws move relative to the base.

According to the clamp structure of the foregoing embodiment, each inner jaw may have a triangular shape, and the number of the at least one limiting inclined plane of each inner jaw is two, and the two limiting inclined planes of each inner jaw are not parallel to each other.

According to the clamp structure of the foregoing embodiment, a projection shape of the at least one limiting slope of each inner claw may be wavy.

According to another embodiment of the present utility model, a clamp structure is provided for clamping a workpiece, the workpiece includes at least two limiting holes, and the clamp structure includes a base and two inner claws. The two inner claws are arranged on the base, each inner claw is used for moving relative to the base so as to change a distance between the two inner claws, and each inner claw comprises at least one positioning groove. When the two inner claws clamp a workpiece, the two inner claws respectively protrude into the two limiting holes of the workpiece, and the distance between the two inner claws is changed, so that the at least one positioning groove of each inner claw is propped against the inner wall of each inner claw, and each inner claw is enabled to press the workpiece in at least two directions.

According to the clamp structure of the foregoing embodiment, each inner claw may have a triangular shape, and the number of the at least one positioning groove of each inner claw is two, and the two positioning grooves of each inner claw are not parallel to each other.

The clamp structure according to the foregoing embodiment, wherein the at least one positioning groove of each inner jaw may have a dovetail groove structure.

According to the above embodiment, the clamp structure may further comprise a moving mechanism, wherein the base comprises a track, and the moving mechanism is disposed in the track and comprises two sliding blocks and a screw. The two sliding blocks are respectively provided with the two inner claws, and the screw rod penetrates through the two sliding blocks to drive the two sliding blocks to move in the track, so that the two inner claws move relative to the base.

According to the above embodiment, the clamp structure may further comprise a moving mechanism, wherein the base comprises a track, and the moving mechanism is disposed in the track and comprises two sliding blocks and two screws. The two sliding blocks are respectively provided with the two inner claws, and the two screws respectively penetrate through the two sliding blocks to drive the two sliding blocks to move in the track, so that the two inner claws move relative to the base.

Drawings

FIG. 1 is a schematic perspective view showing a clamp structure for clamping a workpiece according to embodiment 1 of the present utility model;

FIG. 2 is an exploded view of the clamp structure and the workpiece of the embodiment 1 of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the clamp structure and workpiece of the embodiment 1 of FIG. 1;

FIG. 4 is another cross-sectional view of the clamp structure and workpiece of the embodiment 1 of FIG. 1;

FIG. 5 is a schematic side view of the clamp structure and workpiece and a tool of the embodiment 1 of FIG. 1;

FIG. 6 is a perspective view showing a clamp structure for clamping a workpiece according to embodiment 2 of the present utility model;

FIG. 7 is an exploded view of the clamp structure of the embodiment 2 of FIG. 6;

FIG. 8 is a schematic cross-sectional view of the clamp structure of the embodiment 2 of FIG. 6;

FIG. 9 is a schematic side view of the clamp structure and workpiece of the embodiment 2 of FIG. 6 applied to a processing machine;

FIG. 10 is a schematic top view of a portion of the clamp structure and workpiece applied to the processing machine of the embodiment 2 of FIG. 6;

FIG. 11 is a perspective view showing a clamp structure for clamping a workpiece according to embodiment 3 of the present utility model;

FIG. 12 is an exploded view of the clamp structure of the embodiment 3 of FIG. 11; and

fig. 13 is a schematic cross-sectional view of the clamp structure and the workpiece of embodiment 3 of fig. 11.

Wherein reference numerals are as follows:

100, 200, 300: clamp structure

110, 210, 310: base seat

111, 211, 311: matrix body

112: adapter body

113, 213, 313: rail track

120, 220, 320: moving mechanism

121, 221, 321: sliding block

1211: body

1212: perforation

122, 222, 322: screw rod

1221, 2221: screw part

1222: limiting part

123: fixed block

131, 132, 231, 232, 331, 332: inner claw

1311, 1321, 2311, 2312, 2321, 2322: limiting inclined plane

2211, 3211: screw seat

2212, 3212: slide seat

2213: limiting block

2214: slide base dovetail groove

A1 A2, A3: workpiece

A11 A21, a22, a31: limiting hole

A12: inner wall

B1 And B2: direction of

D1: distance of

T1: cutting tool

T2: working table

θ: acute angle

Detailed Description

Embodiments of the present utility model will be described below with reference to the accompanying drawings. For purposes of clarity, many practical details will be set forth in the following description. However, the reader should appreciate that these practical details should not be used to limit the present utility model. That is, in some embodiments of the present utility model, these practical details are unnecessary. Moreover, for the sake of simplicity of the drawing, some of the well-known structures and elements are shown in the drawings in a simplified schematic manner; and repeated elements will likely be indicated by identical or analogous numerals.

In addition, the terms first, second, third, etc. are used herein only to describe different elements or components, and there is no limitation on the elements/components themselves, and thus, the first element/component may be modified as a second element/component. And the combination of elements/components/mechanisms/modules herein is not a common, conventional or existing combination in the art, and it cannot be determined whether the combination relationship thereof is easily accomplished by a person of ordinary skill in the art by whether the elements/components/mechanisms/modules themselves are existing.

Referring to fig. 1 and 2, fig. 1 is a schematic perspective view illustrating a clamp structure 100 for clamping a workpiece A1 according to embodiment 1 of the present utility model, and fig. 2 is an exploded schematic view illustrating the clamp structure 100 and the workpiece A1 of embodiment 1 of fig. 1. The clamp structure 100 is used for clamping a workpiece A1 and comprises a base 110 and two inner claws 131 and 132. The two inner claws 131 and 132 are disposed on the base 110, and each inner claw 131 and 132 is configured to move relative to the base 110 to change a distance D1 (shown in fig. 3) between the two inner claws 131 and 132, and each inner claw 131 and 132 includes at least one limiting inclined surface 1311 (shown in fig. 3) and 1321. When the two inner claws 131 and 132 clamp the workpiece A1, the at least one limiting inclined surface 1311 and 1321 of each inner claw 131 and 132 protrudes into a limiting hole a11 of the workpiece A1, and the distance D1 between the two inner claws 131 and 132 is changed, so that the at least one limiting inclined surface 1311 and 1321 of each inner claw 131 and 132 is pressed against the workpiece A1.

Thereby, the inner claws 131, 132 protrude into the limiting hole a11 of the workpiece A1, so that the chance of interference between the inner claws 131, 132 and the tool T1 (shown in fig. 5) can be reduced, and further, the inner claws 131, 132 can press the workpiece A1 from inside to outside, which can help straighten the workpiece A1 and avoid deformation of the workpiece A1. Details of the clamp structure 100 will be described later.

The base 110 may include a base 111 and a adaptor 112, the base 111 is generally cylindrical and disposed above the adaptor 112, the base 111 is provided with inner claws 131 and 132, and the clamp structure 100 may further include a plurality of screws for locking the base 111 and the adaptor 112. In other embodiments, the adaptor can be set according to the requirement, but is not limited thereto.

Referring to fig. 3 and 4, and referring to fig. 1 and 2, fig. 3 is a schematic cross-sectional view of the clamp structure 100 and the workpiece A1 of the embodiment 1 of fig. 1, and fig. 4 is another schematic cross-sectional view of the clamp structure 100 and the workpiece A1 of the embodiment 1 of fig. 1. Each inner jaw 131, 132 may be triangular, and the number of at least one limiting slope 1311, 1321 of each inner jaw 131, 132 is two, and the two limiting slopes 1311 of the inner jaw 131 are not parallel to each other, and the two limiting slopes 1321 of the inner jaw 132 are not parallel to each other. Specifically, each of the inner claws 131 and 132 has an isosceles triangle shape in plan view, and the isosceles triangle shape includes two symmetrical waists and a base. Taking the inner claw 131 as an example, the inner claw 131 further includes a top surface and an abutment surface in addition to the two limiting inclined surfaces 1311, the two limiting inclined surfaces 1311 respectively correspond to two symmetrical waists of the isosceles triangle and are not parallel to each other, the abutment surface corresponds to a bottom edge, that is, the two limiting inclined surfaces 1311 and the abutment surface are connected to form an isosceles triangle, and the top surface is parallel to the surface of the slider 121 and is connected to the two limiting inclined surfaces 1311 and the abutment surface. The limiting inclined planes 1311 may form an acute angle θ with the surface of the slider 121, so each limiting inclined plane 1311 may form a positioning groove with the surface of the slider 121. Since the two limiting inclined planes 1311 of the inner claw 131 are not parallel to each other, when the two positioning grooves are propped against the inner wall a12 of the limiting hole a11, that is, when the two limiting inclined planes 1311 are propped against the inner wall a12 of the limiting hole a11, the workpiece A1 can be forced outwards from the direction B1 and the direction B2 as shown in fig. 1, and the workpiece A1 can be clamped stably because the direction B1 and the direction B2 are not parallel to each other and form an angle. The structure of the inner jaw 132 is the same as that of the inner jaw 131, details will not be described again, and details of the slider 121 will be described later. In other embodiments, the inner claw may have other shapes, such as a semicircle, and may include only one limiting slope corresponding to the circular arc to include a positioning groove, and may tightly position the workpiece in all radial directions of the circular arc, which is not limited thereto.

The clamp structure 100 may further comprise a moving mechanism 120, the base 110 may comprise a track 113, and the moving mechanism 120 is disposed in the track 113 and comprises two sliding blocks 121 and a screw 122. The two sliding blocks 121 are respectively provided with two inner claws 131 and 132, and the screw 122 penetrates through the two sliding blocks 121 to drive the two sliding blocks 121 to move in the track 113, so that the two inner claws 131 and 132 move relative to the base 110.

Specifically, the track 113 of the base 110 is formed along a radial direction of the base 111 and penetrates through the base 111, and a portion adjacent to the adapter 112 has a larger caliber, so that two stopping portions capable of preventing the slider 121 from being separated upward are formed on the base 111. Each slider 121 may include a body 1211 and a through hole 1212, the body 1211 is disposed in the track 113 and has two ribs corresponding to the two stop portions, the through hole 1212 penetrates the body 1211 along the radial direction of the base 111, the screw 122 may include two threaded portions 1221 and a limiting portion 1222, the two threaded portions 1221 may be respectively connected to two sides of the limiting portion 1222 and configured to penetrate the two sliders 121, and the moving mechanism 120 may further include a fixing block 123 for the limiting portion 1222 to penetrate, so as to fix the screw 122 in the track 113. When the screw 122 rotates, the two sliding blocks 121 can slide out or slide in relative to the base 111, thereby changing the distance D1 between the two inner claws 131 and 132 to press the limiting hole a11 of the workpiece A1. Moreover, since both inner claws 131, 132 are movable, the centering effect can be increased.

As shown in fig. 3, when the workpiece A1 is fixed, the workpiece A1 may be first placed on the clamp structure 100, where the inner claws 131 and 132 protrude into the limiting hole a11 and the top surface contacts the upper wall of the limiting hole a11, and where the inner claws 131 and 132 may be respectively located at the first position and have an initial distance D1. Then, the two sliders 121 can be moved to move the inner claws 131 and 132 away from each other to increase the distance D1 and move to the second position of fig. 4, so that the limiting inclined surfaces 1311 and 1321 can push outwards against the inner wall a12, and due to the acute angle θ, the workpiece A1 can be prevented from being separated from the inner claws 131 and 132 upwards when the limiting inclined surfaces 1311 and 1321 push against the inner wall a12, and the rapid positioning effect can be achieved. It is to be noted that, in embodiment 1, the limiting hole a11 of the workpiece A1 is shaped like a diamond, and the length between the two corresponding vertexes corresponds to the length between the vertexes of the isosceles triangle between the inner jaw 131 and the inner jaw 132 when the inner jaw 132 is located at the second position. In other embodiments, workpieces of different sizes may have the same size of limiting hole and may be matched with the same clamp structure, and clamp structures of different sizes may be designed to match with different limiting holes, not limited by the disclosure above.

Referring to fig. 5, and referring to fig. 1 to 4, fig. 5 is a schematic side view of the clamp structure 100 and the workpiece A1 and a tool T1 according to the embodiment 1 of fig. 1. Because the inner claws 131, 132 of the clamp structure 100 are located in the limiting hole a11, the outer wall of the workpiece A1 is completely free from any shielding, that is, the clamp structure 100 does not interfere with the tool T1, so that the tool T1 can process any position of the outer wall of the workpiece A1. Note that fig. 2-5 omit the adaptor 112 for simplicity of the drawing, but the present utility model is not limited thereto.

Referring to fig. 6, 7 and 8, fig. 6 is a perspective view of a clamp structure 200 for clamping a workpiece A2 according to embodiment 2 of the present utility model, fig. 7 is an exploded view of the clamp structure 200 of embodiment 2 of fig. 6, and fig. 8 is a cross-sectional view of the clamp structure 200 of embodiment 2 of fig. 6. The clamp structure 200 is similar to the clamp structure 100 of embodiment 1, but has a slight difference, and only the differences are described below, and the same or similar parts are not repeated.

As shown in fig. 6 and 7, the base body 211 of the base 210 has a substantially rectangular parallelepiped shape, and the rail 213 penetrates the base body 211 in the longitudinal direction. Each slide block 221 of the moving mechanism 220 comprises a screw seat 2211, a slide seat 2212, a slide seat dovetail groove 2214 and two limiting blocks 2213, wherein the screw seat 2211 is used for the threaded portion 2221 of the screw rod 222 to penetrate through, the slide seat dovetail groove 2214 is arranged on the slide seat 2212, the slide seat 2212 is clamped with the screw seat 2211 through the slide seat dovetail groove 2214, and the limiting blocks 2213 can be assembled on two sides of the slide seat 2212 to prevent the slide seat 2212 from being separated from the screw seat 2211. By this, by the arrangement of the slide dovetail groove 2214, a downward pressure can be generated to prevent the workpiece A2 from floating up when the clamp structure 200 clamps the workpiece A2.

The two inner claws 231 and 232 are respectively disposed on the two slide base 2212, and a projection shape of at least one limiting inclined surface 2311 and 2321 of each inner claw 231 and 232 can be wavy. Taking the inner claw 231 as an example, the inner claw 231 may be rectangular, the rectangular may include two long sides, the inner claw 231 may include two limiting slopes 2311 and 2312 corresponding to the two rectangular long sides respectively, and the shapes of the limiting slopes 2311 and 2312 are different. The limiting inclined plane 2311 can have larger-amplitude concave-convex (a plurality of convex arcs) so as to enable the projection of the limiting inclined plane 2311 to be wavy, and a wavy positioning groove can be formed; the limiting slope 2312 may have a small width of concave-convex to make the projection of the limiting slope into a tooth shape, so that a tooth-shaped positioning groove can be formed, and the limiting slope 2312 is adjacent to the inner claw 232. The inner claw 232 has the same structure as the inner claw 231 and includes a wavy limit inclined surface 2321 and a toothed limit inclined surface 2322, so as to form a wavy positioning groove and a toothed positioning groove respectively. The wavy positioning groove may help to stably clamp the workpiece A2, but in other embodiments, the two sides of the wavy positioning groove may be toothed, so as to facilitate processing, or the wavy positioning groove may be composed of only double-convex arcs, which is not limited by the disclosure above.

The clamp structure 200 may be configured to clamp the workpiece A2 outwardly or inwardly, and the workpiece A2 may include two limiting apertures a21, a22. When the two inner claws 231 and 232 clamp the workpiece A2, the inner claw 231 protrudes into the limiting hole a21 of the workpiece A2, the inner claw 232 protrudes into the limiting hole a22 of the workpiece A2, and the distance between the two inner claws 231 and 232 is changed, so that the positioning grooves of the inner claws 231 and 232 abut against the inner walls of the limiting holes a21 and a22, and the inner claws 231 and 232 are pressed against the workpiece A2 in at least two directions. In detail, if the clamp structure 200 is pressed outward to tightly press the workpiece A2, the two inner claws 231 and 232 are relatively far apart to increase the distance, so that the limiting inclined surfaces 2311 and 2321 (the wavy positioning grooves) respectively abut against the outer inner walls of the limiting holes a21 and a 22; if the clamp structure 200 is pressed inward to tightly press the workpiece A2, the two inner claws 231 and 232 are relatively close to each other to reduce the distance, so that the limiting inclined surfaces 2312 and 2322 (tooth-shaped positioning grooves) respectively abut against the inner walls of the limiting holes a21 and a22, and the shapes of the limiting holes a21 and a22 can be matched with the shapes of the inner claws 231 and 232.

Referring to fig. 9 and 10, and referring to fig. 6 to 8, fig. 9 is a schematic side view of a portion of the clamp structure 200 and the workpiece A2 of the embodiment 2 of fig. 6 applied to a processing machine, and fig. 10 is a schematic top view of a portion of the clamp structure 200 and the workpiece A2 of the embodiment 2 of fig. 6 applied to a processing machine. As shown in fig. 9 and 10, the clamp structure 200 is disposed on the table T2 of the processing machine, and since the inner claws 231 and 232 of the clamp structure 200 are respectively disposed in the limiting holes a21 and a22, no shielding is caused to the outer wall of the workpiece A2 no matter whether the inner claws are outwardly or inwardly pressed against the workpiece A2, that is, the clamp structure 200 does not interfere with the tool T1, so that the tool T1 can process any position of the outer wall of the workpiece A2, such as the bottom of the outer wall, at different angles.

Referring to fig. 11, 12 and 13, fig. 11 is a perspective view of a clamp structure 300 for clamping a workpiece A3 according to embodiment 3 of the present utility model, fig. 12 is an exploded view of the clamp structure 300 of embodiment 3 of fig. 11, and fig. 13 is a cross-sectional view of the clamp structure 300 and the workpiece A3 of embodiment 3 of fig. 11. The structure of the clamp structure 300 is similar to the clamp structure 200 of embodiment 2, and only the differences are described below.

As shown in fig. 11 to 13, the base body 311 of the base 310 has a substantially rectangular parallelepiped shape, and the rail 313 penetrates the base body 311 in the longitudinal direction. The moving mechanism 320 may include two sliding blocks 321 and two screws 322, each sliding block 321 may include a screw base 3211 and a sliding base 3212, each screw base 3211 may be used for the screw 322 to pass through, each sliding base 3212 is disposed on the screw base 3211, and each inner claw 331, 332 may be disposed on each sliding base 3212.

As shown in fig. 11, the workpiece A3 may include four limiting holes a31, and the four limiting holes a31 are located at four corners of the workpiece A3. When the clamp structure 300 is used for clamping a workpiece A3, the two inner claws 331 and 332 respectively protrude into two of the four limiting holes a31 of the workpiece A3, and the distance between the inner claws 331 and 332 is changed, so that the positioning grooves of the inner claws 331 and 332 abut against the inner walls of the inner claws and the inner claws 331 and 332 are pressed against the workpiece A3 in at least two directions. Thus, two clamp structures 300 may be used to clamp the workpiece A3, with each clamp structure 300 corresponding to two limiting holes a31. In other embodiments, the number of limiting holes may be increased, and different numbers of clamp structures may be matched according to the number of limiting holes.

Although the present utility model has been described with reference to the above embodiments, it should be understood that the utility model is not limited thereto, but may be modified or altered in various ways without departing from the spirit and scope of the utility model.

Claims (10)

1. A clamp structure for clamping a workpiece, the clamp structure comprising:

a base; and

two inner claws arranged on the base, wherein each inner claw is used for moving relative to the base so as to change a distance between the two inner claws, and each inner claw comprises at least one limiting inclined plane;

when the two inner claws clamp the workpiece, the at least one limiting inclined plane of each inner claw protrudes into a limiting hole of the workpiece, and the distance between the two inner claws is changed, so that the at least one limiting inclined plane of each inner claw is used for tightly pressing the workpiece.

2. The clamp structure of claim 1, further comprising a moving mechanism, the base comprising a track, the moving mechanism disposed within the track and comprising:

two sliding blocks for the two inner claws to be arranged respectively; and

the screw rod penetrates through the two sliding blocks to drive the two sliding blocks to move in the track, so that the two inner claws move relative to the base.

3. The clamp structure of claim 1, further comprising a moving mechanism, the base comprising a track, the moving mechanism disposed within the track and comprising:

two sliding blocks for the two inner claws to be arranged respectively; and

the two screws are respectively arranged on the two sliding blocks in a penetrating way to drive the two sliding blocks to move in the track, so that the two inner claws move relative to the base.

4. The clamp structure of claim 1, wherein each of the inner claws has a triangular shape, and the number of the at least one limiting inclined surface of each of the inner claws is two, and the two limiting inclined surfaces of each of the inner claws are not parallel to each other.

5. The clamp structure of claim 1, wherein a projected shape of the at least one limiting slope of each inner jaw is wavy.

6. A clamp structure for clamping a workpiece, the workpiece including at least two limiting holes, the clamp structure comprising:

a base; and

two inner claws arranged on the base, wherein each inner claw is used for moving relative to the base so as to change a distance between the two inner claws, and each inner claw comprises at least one positioning groove;

when the two inner claws clamp the workpiece, the two inner claws respectively protrude into the two limiting holes of the workpiece, and the distance between the two inner claws is changed, so that the at least one positioning groove of each inner claw is propped against the inner wall of each inner claw, and each inner claw is used for tightly pressing the workpiece in at least two directions.

7. The clamp structure of claim 6, wherein each of the inner claws has a triangular shape, and the number of the at least one positioning groove of each of the inner claws is two, and the two positioning grooves of each of the inner claws are not parallel to each other.

8. The clamp structure of claim 6, wherein the at least one locating slot of each inner jaw has a dovetail configuration.

9. The clamp structure of claim 6, further comprising a moving mechanism, the base comprising a track, the moving mechanism disposed within the track and comprising:

two sliding blocks for the two inner claws to be arranged respectively; and

the screw rod penetrates through the two sliding blocks to drive the two sliding blocks to move in the track, so that the two inner claws move relative to the base.

10. The clamp structure of claim 6, further comprising a moving mechanism, the base comprising a track, the moving mechanism disposed within the track and comprising:

two sliding blocks for the two inner claws to be arranged respectively; and

the two screws are respectively arranged on the two sliding blocks in a penetrating way to drive the two sliding blocks to move in the track, so that the two inner claws move relative to the base.

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