CN220416741U - Flat computer bracket with lamp - Google Patents

Abstract

The utility model provides a tablet computer support with a lamp, and relates to the technical field of computer supports. Comprising the following steps: the device comprises a mounting seat, a connecting piece, a folding piece, a clamp and a lamp; the number of the folding pieces is 2, and each folding piece comprises two connecting rods which are connected in a rotating way; the clamp and the lamp are respectively connected with a folding piece in a rotating way. The connecting piece and the folding piece are used for changing the space positions of the clamp and the lamp, so that the bracket can be lengthened or shortened as required, the lamp can be moved to any position around the clamp, and the lamp can illuminate the environment around the clamp, so that people can observe and use articles around the tablet personal computer, the brightness difference between the tablet personal computer and the environment is reduced, and eyes can be protected. Secondly, the connecting piece rotates with the mount pad to be connected, and the connecting rod rotates with the connecting piece to be connected, and two connecting rods in the folded piece rotate to be connected, anchor clamps and lamps and lanterns rotate with a folded piece respectively to be connected for panel computer support can fold together, is convenient for accomodate.

Description

Flat computer bracket with lamp

Technical Field

The utility model relates to the technical field of computer supports, in particular to a tablet personal computer support with a lamp.

Background

The screen of the tablet computer is larger than that of the mobile phone, and is generally used for playing videos or reading articles and the like. The time for people to use the tablet personal computer is more, and the applicable scene is more complicated. When people use the tablet personal computer in a dim environment, the tablet personal computer is a large-area and unique light source, and light emitted by the tablet personal computer directly irradiates eyes. If people need to use the articles around the tablet personal computer, such as a keyboard and a mouse matched with the tablet personal computer, a water cup arranged at the side of the tablet personal computer, and the like, at the moment, eyes focus on the articles, the phenomenon that the eyes cannot adapt to the surrounding light environment at one time, namely 'black under a lamp' may occur. Tablet personal computer supports in the prior art are various, but are mostly used for being placed on some platforms, and the supports are not provided with light sources, so that the condition of black under lamps cannot be improved.

Accordingly, it is desirable to provide a tablet computer holder that can illuminate the surroundings of the tablet computer.

Disclosure of Invention

The utility model aims to provide a tablet computer bracket with a lamp, which aims to solve the technical problems that the tablet computer bracket in the prior art can only be used for supporting a tablet computer and cannot provide a light source to illuminate the surrounding environment of the tablet computer _。

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model provides a tablet personal computer bracket with a lamp, which comprises: a mounting base; the connecting piece is rotationally connected with the mounting seat; the folding piece comprises two connecting rods which are connected in a rotating way; the number of the folding pieces is two, and the folding pieces are both rotationally connected with one end of the connecting piece, which is far away from the mounting seat; the clamp is used for clamping the tablet personal computer and is rotationally connected with one of the folding pieces; and the lamp is used for irradiating the surrounding environment and is rotationally connected with the other folding piece.

Preferably, the folding piece further comprises a first rotary joint, and the first rotary joint is used for connecting the connecting rod and the lamp; the first rotary joint comprises a first joint and a second joint which are connected in a rotating way; the rotating shafts of the first joint and the second joint are first shafts; the first joint and the second joint are respectively provided with a second shaft perpendicular to the first shaft; wherein the connecting rod is rotationally connected with the first joint around the axis of the first shaft; the lamp is rotationally connected with the second joint around the axis of the second shaft.

Preferably, the lamp comprises a lamp body and a support; the lamp body is arranged on the support; the support is rotatably connected with the second joint around the axis of the second shaft.

Preferably, the lamp body is elongated; the support is provided with a guide plate which is used for guiding a part of light rays emitted by the lamp body; the deflector is located the side of lamp body and the long limit of deflector is parallel with the axis of lamp body.

Preferably, the folding member further comprises a second rotary joint for connecting the connecting rod and the clamp; the second rotary joint comprises a third joint and a fourth joint which are connected in a rotating way; the rotating shafts of the third joint and the fourth joint are third shafts; the fourth joint is provided with a fourth shaft perpendicular to the third shaft; the clamp is rotationally connected with the fourth joint around the axis of the fourth shaft; the connecting rod is fixedly connected with the third joint.

Preferably, the fixture further comprises a connecting seat, clamping claws, a guide rod and an adjusting mechanism; the connecting seat is arranged on the fourth joint; the number of the clamping claws is a pair, and each clamping claw is connected with at least one guide rod; the guide rod is arranged on the connecting seat in a sliding way; the adjusting mechanism is arranged on the connecting seat and is positioned between the pair of clamping claws; the adjusting mechanism is used for driving the guide rod to axially move along the guide rod so as to realize that the tablet personal computer is clamped or loosened by the pair of clamping claws.

Preferably, the adjusting mechanism comprises a first knob, a rack and a gear; the first knob is rotationally connected with the connecting seat; the gear is axially connected with the first knob; the centers of the racks are distributed on two sides of the first knob, the two racks are respectively connected with the guide rod on one clamping claw, and the long side of each rack is parallel to the axis of the guide rod; any rack is meshed with the gear.

Preferably, the adjusting mechanism further comprises a sliding block, a swing rod and a second knob; the second knob is rotationally connected with the connecting seat; the number centers of the pair of sliding blocks are distributed on two sides of the second knob; the two sliding blocks are respectively connected with the guide rod on one clamping claw, and each sliding block is arranged on the connecting seat in a sliding way; the center of the pair of swing rods is symmetrically distributed on two sides of the second knob, one end of any swing rod is rotationally connected with the sliding block, and the other end of any swing rod is rotationally connected with the second knob.

Compared with the prior art, the embodiment of the utility model has at least the following advantages or beneficial effects:

the mounting seat is used for being fixed on a plane, the connecting piece and the folding piece are used for changing the space positions of the clamp and the lamp, so that the bracket can be lengthened or shortened as required, the lamp can be moved to any position around the clamp, the lamp can illuminate the environment around the clamp, people can observe articles around the tablet personal computer, the brightness difference between the tablet personal computer and the environment is reduced, and eyes are protected. Secondly, the connecting piece rotates with the mount pad to be connected, and the connecting rod rotates with the connecting piece to be connected, and two connecting rods in the folded piece rotate to be connected, anchor clamps and lamps and lanterns rotate with a folded piece respectively to be connected for panel computer support can fold together, is convenient for accomodate.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a tablet computer stand according to an embodiment of the present utility model;

FIG. 2 is an enlarged view at A in FIG. 1;

FIG. 3 is a schematic view of a lamp body and a guide plate according to an embodiment of the present utility model;

FIG. 4 is a schematic view of another structure of a lamp body and a guide plate according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a second rotary joint according to an embodiment of the present utility model;

FIG. 6 is a schematic view of a clamp according to an embodiment of the present utility model;

FIG. 7 is a schematic view of the structure of an adjusting mechanism according to an embodiment of the present utility model;

FIG. 8 is a schematic view of another construction of an adjustment mechanism according to an embodiment of the present utility model;

FIG. 9 is an enlarged view of FIG. 1 at B;

FIG. 10 is a schematic view of another structure of a tablet computer stand according to an embodiment of the present utility model;

FIG. 11 is an enlarged view of FIG. 10 at C;

fig. 12 is a schematic structural view of a connector according to an embodiment of the present utility model.

Icon: 100. a mounting base; 200. a connecting piece; 210. a first cylinder; 220. a second cylinder; 230. a locking sleeve; 240. a compaction cylinder; 250. briquetting; 260. a mounting member; 310. a connecting rod; 320. a first rotary joint; 3210. a first joint; 3220. a second joint; 330. a second rotary joint; 3310. a third joint; 3320. a fourth joint; 340. a third rotary joint; 3410. a fifth joint; 3420. a sixth joint; 400. a clamp; 410. a connecting seat; 420. clamping claws; 430. a guide rod; 440. an adjusting mechanism; 4410. a first knob; 4420. a rack; 4430. a gear; 4440. a slide block; 4450. swing rod; 4460. a second knob; 500. a lamp; 510. a lamp body; 520. a support; 530. and a guide plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, based on the examples herein, which are within the scope of the utility model as defined by the claims, will be within the scope of the utility model as defined by the claims.

The utility model provides a tablet computer support with a lamp, referring to fig. 1, comprising: a mounting base 100; a connecting member 200 rotatably connected to the mount 100; a folding member comprising two links 310 rotatably connected; the number of the folding pieces is two, and the folding pieces are both in rotary connection with one end of the connecting piece 200 away from the mounting seat 100; the clamp 400 is used for clamping the tablet personal computer and is rotationally connected with one of the folding pieces; a luminaire 500 for illuminating the surroundings and being rotatably connected to the other folder.

In some embodiments, referring to fig. 1, a plurality of through holes may be provided in the mounting block 100, and screws may be used to pass through the through holes and connect with a wall or table top or other platform. The two ends of the connecting piece 200 are respectively and rotatably connected with the mounting seat 100 and the connecting rod 310, the connecting rod 310 is rotatably connected with the clamp 400 or the lamp 500, the space position of the clamp 400 or the lamp 500 can be greatly adjusted by rotating the connecting parts, the clamp 400 or the lamp 500 moves up and down, left and right and back relative to the mounting seat 100, and when the clamp 400 does not clamp a tablet personal computer, the lamp 500 can be used as a desk lamp with good ductility; when the tablet computer is held by the clamp 400, the lamp 500 can be moved to the vicinity of the clamp 400 to illuminate the environment in the vicinity of the tablet computer, so that people can observe articles around the tablet computer.

In some embodiments, referring to fig. 1 and 2, the folder further includes a first swivel 320, the first swivel 320 for connecting the link 310 and the light fixture 500; the first rotary joint 320 includes a first joint 3210 and a second joint 3220 rotatably connected; the rotation axes of the first joint 3210 and the second joint 3220 are first axes; the first joint 3210 and the second joint 3220 are each provided with a second shaft perpendicular to the first shaft; wherein the connecting rod 310 is rotatably connected with the first joint 3210 around the axis of the first shaft; the light fixture 500 is rotatably connected to the second joint 3220 about the axis of the second shaft.

In detail, the connecting rod 310 is rotatably connected with the connecting rod 310, and the connecting rod 310 is also rotatably connected with the connecting piece 200, so that the lamp 500 can be moved to the accessory of the clamp 400 by means of the connecting rod 310, and the light of the lamp 500 can illuminate the surrounding environment of the tablet personal computer. The luminaire 500 may be rectangular parallelepiped in shape. When the connecting rod 310 rotates around the axis of the first shaft, the included angle of the long-side tablet computer of the lamp 500 in the XOY plane can be changed; when the second joint 3220 rotates relative to the first joint 3210, an included angle between the long side of the lamp 500 and the Z-axis may be changed; when the lamp 500 rotates around the axis of the second shaft, the light emitted by the lamp 500 can be irradiated to the environment where the circle using the axis of the lamp 500 as the central axis is located, such as a wall surface, a ceiling, a ground, and the like.

In some embodiments, referring to fig. 1 and 2, a luminaire 500 includes a lamp body 510 and a support 520; the lamp body 510 is disposed on the support 520; the support 520 is rotatably connected to the second joint 3220 about the axis of the second shaft. A processor and a control board may also be included; the lamp body 510 may be provided with a power line for connecting an external power source; the lamp body 510, external power supply and control board are all electrically connected with the processor. The light body 510 may be a color-tunable LED light, i.e., the light body 510 may be tuned to a cool or warm color, and multiple tuning gradients may be set between the cool and warm colors. The control board is provided with a switch for controlling the operation of the lamp body 510 and a control button for controlling the LED lamp to change the color tone, and the control board may be provided with a button for adjusting the brightness of the lamp body 510. The processor may be disposed on the mount 100 and the control board may be disposed on the link 310.

In some embodiments, referring to fig. 1, the light body 510 is elongated; the support 520 is provided with a guide plate 530, and the guide plate 530 is used for guiding a part of light rays emitted by the lamp body 510; the guide plate 530 is located at a side of the lamp body 510 and a long side of the guide plate 530 is parallel to an axis of the lamp body 510.

In detail, referring to fig. 3, the lamp body 510 may have a cylindrical shape, the surface of the lamp body 510 is a curved surface, and a light irradiation area emitted from the lamp body 510 is a fan shape, and at this time, the guide plate 530 blocks and guides a portion of the light such that the light near the guide plate 530 extends along the guide plate 530. The connecting rods 310 rotate around the connecting piece 200, the two connecting rods 310 rotate relatively, the lamp 500 rotates around the connecting rods 310, the lamp body 510 can move to the front of the screen of the tablet computer under the action of the first rotary joint 320 and the third rotary joint 340, the long side of the lamp body 510 is parallel to the long side of the tablet computer, the guide plate 530 is positioned on the front side of the tablet computer, the guide plate 530 is parallel to the screen, at the moment, light rays emitted by the lamp body 510 extend along the guide plate 530, and the situation that the light rays of the lamp body 510 irradiate on the tablet computer to be reflected into eyes to cause eyestrain of a user is avoided.

In other embodiments, referring to fig. 4, the number of the guide plates 530 may be located on the symmetry plane of the light body 510, when the light fixture 500 is placed, the long side of the light body 510 may be parallel to the long side of the tablet computer, the guide plates 530 are located above the tablet computer, one end surface of the guide plates 530 is located on the front side of the screen of the tablet computer and parallel to the screen, and the other end surface of the guide plates 530 is located on the rear side of the screen, so that a part of the light emitted by the light body 510 irradiates in front of the screen and is not reflected by the screen; another portion of the light illuminates the environment behind the tablet computer screen to reduce eye strain for the user.

In some embodiments, referring to fig. 5, the folder further includes a second swivel 330, the second swivel 330 for connecting the link 310 and the clamp 400; the second rotary joint 330 includes a third joint 3310 and a fourth joint 3320 that are rotatably connected; the rotation axes of the third joint 3310 and the fourth joint 3320 are third axes; the fourth joint 3320 is provided with a fourth axis perpendicular to the third axis; wherein the clamp 400 is rotatably coupled to the fourth joint 3320 about the axis of the fourth shaft; the connecting rod 310 is fixedly connected with the third joint 3310.

In detail, when the tablet computer is placed on the jig 400, the axis of the third shaft is parallel to the screen of the tablet computer. The third joint 3310 and the fourth joint 3320 are rotated around the third axis to change the relative angle between the tablet pc and the connecting rod 310 so that the tablet pc may be arranged with a certain inclination angle with respect to the horizontal plane. Because the clamp 400 is rotatably connected with the fourth joint 3320 around the axis of the fourth shaft, the tablet computer can be adjusted to be a vertical screen or a horizontal screen.

In some embodiments, referring to fig. 6, the clamp 400 further includes a connecting seat 410, a clamping jaw 420, a guide bar 430, and an adjustment mechanism 440; the connecting seat 410 is arranged on the fourth joint 3320; the number of the clamping claws 420 is one pair, and at least one guide rod 430 is connected to each clamping claw 420; the guide rod 430 is slidably disposed on the connecting base 410; the adjusting mechanism 440 is disposed on the connection block 410 and between the pair of clamping jaws 420; the adjusting mechanism 440 is used for driving the guide rod 430 to move along the axial direction of the guide rod 430, so as to clamp or unclamp the tablet personal computer by the pair of clamping claws 420.

In some embodiments, referring to fig. 7, the adjustment mechanism 440 includes a first knob 4410, a rack 4420, and a gear 4430; the first knob 4410 is rotatably connected with the connecting seat 410; gear 4430 is axially coupled to first knob 4410; the centers of the racks 4420 are distributed on two sides of the first knob 4410, the two racks 4420 are respectively connected with the guide rod 430 on one of the clamping claws 420, and the long side of each rack 4420 is parallel to the axis of the guide rod 430; any rack 4420 is meshed with the gear 4430.

In detail, the inside of the connection seat 410 is provided with a cavity for accommodating the gear 4430 and the rack 4420. The first knob 4410 is partially located outside the connecting base 410, and partially extends into the connecting base 410 and is connected with the gear 4430. Each gripper jaw 420 may be provided with two guide rods 430, one end of each guide rod 430, which is far away from the gripper jaw 420, may be provided with a connecting block, each connecting block is connected with one rack 4420, and one end of each rack 4420, which is far away from the connecting block, is a free end. The first knob 4410 is rotated in the forward direction, the gear 4430 drives the two racks 4420 to move in the opposite direction, and at the moment, the two clamping claws 420 are closed to realize the clamping function; turning the first knob 4410 in the opposite direction, the gear 4430 drives the two racks 4420 in the opposite direction, and the two clamping claws 420 are far away from each other to realize the loosening function. The forward direction here refers to clockwise or counterclockwise, and the rotation direction of the first knob 4410 is positive when the two holding claws 420 are closed.

In some embodiments, referring to fig. 8, the adjustment mechanism 440 further includes a slider 4440, a swing link 4450, and a second knob 4460; the second knob 4460 is rotatably connected with the connecting seat 410; the centers of the number of the pair of sliding blocks 4440 are distributed on two sides of the second knob 4460; two sliding blocks 4440 are respectively connected with the guide rod 430 on one clamping claw 420, and each sliding block 4440 is slidably arranged on the connecting seat 410; the center of the pair of swing rods 4450 is symmetrically distributed on two sides of the second knob 4460, one end of any swing rod 4450 is rotationally connected with the sliding block 4440, and the other end of the swing rod 4450 is rotationally connected with the second knob 4460.

In detail, when the second knob 4460 rotates in the forward direction, the pair of swing rods 4450 rotate around the second knob 4460, the swing rods 4450 drive the sliding blocks 4440 to move towards the second knob 4460, at this time, the two sliding blocks 4440 move towards each other, the sliding blocks 4440 drive the clamping claws 420 to move through the guide rods 430, at this time, the two clamping claws 420 draw close to each other to realize the clamping function; when the second knob 4460 rotates reversely, the swing rod 4450 drives the sliding block 4440 to move away from the second knob 4460, and the two clamping claws 420 move reversely along with the sliding block 4440, so that the two clamping claws 420 move away from each other to realize the loosening function. The forward direction here refers to clockwise or counterclockwise, and the rotation direction of the second knob 4460 is positive when the two holding claws 420 are closed.

Referring to fig. 1, 9, 10 and 11, the folder further includes a third rotary joint 340, the third rotary joint 340 for connecting the link 310 and the connector 200; the third rotary joint 340 includes a fifth joint 3410 and a sixth joint 3420 rotatably connected; the rotation axes of the fifth joint 3410 and the sixth joint 3420 are fifth axes; the sixth joint 3420 is provided with a sixth axis perpendicular to the fifth axis; the link 310 is fixedly connected to the fifth joint 3410. The third rotary joint 340 is used to adjust the relative position between the link 310 and the connector 200. The axis of the sixth shaft may be set as desired.

In some embodiments, referring to fig. 1 and 9, the connector 200 is a single piece, and the connector 200 is rotatably coupled to the sixth joint 3420 about a sixth axis, which may be perpendicular to the long side of the connector 200.

In other embodiments, referring to fig. 10 and 11, the connector 200 includes a first barrel 210, a second barrel 220, and a locking sleeve 230. The axis of the sixth shaft may be parallel to the long side of the connector 200.

Referring to fig. 10 and 12, the first cylinder 210 is disposed on the mounting base 100, one end of the second cylinder 220 is slidably sleeved in the first cylinder 210, the other end of the second cylinder 220 is provided with a mounting member 260, and the mounting member 260 is used for connecting with the connecting rod 310. The end of the first cylinder 210 far away from the mounting seat 100 is provided with a compression cylinder 240, and the outer side wall of the compression cylinder 240 is provided with threads; the locking sleeve 230 is slidably disposed on the second cylinder 220, threads are disposed on an inner side wall of the locking sleeve 230, and the locking sleeve 230 is disposed on an outer side of the pressing cylinder 240 and is in threaded connection with the pressing cylinder 240. The compressing cylinder 240 is provided with a plurality of openings along the circumferential direction for dividing the compressing cylinder 240 into a plurality of circumferentially arranged pressing blocks 250, the inner side wall of each pressing block 250 is abutted against the outer side wall of the second cylinder 220, the inner side surface of one side of the locking sleeve 230, which is close to the second cylinder 220, can be a conical surface, when the locking sleeve 230 is in threaded connection with the compressing cylinder 240, each pressing block 250 is pressed by the conical surface of the locking sleeve 230 to deform towards the center of the first cylinder 210, and the plurality of pressing blocks 250 compress the outer side wall of the second cylinder 220, so that the first cylinder 210 and the second cylinder 220 are locked, and the second cylinder 220 is prevented from moving along the axial direction of the first cylinder 210. When the axial length of the connector 200 needs to be adjusted, the first cylinder 210 and the second cylinder 220 can be fixed by only loosening the locking sleeve 230 from the pressing cylinder 240 and axially moving the second cylinder 220 to change the distance between the mounting seat 100 and the mounting member 260 and then screwing the locking sleeve 230 and the pressing cylinder 240 to fix the distance between the mounting seat 100 and the mounting member 260.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (8)

1. A tablet computer support with a lamp, comprising:

a mounting base;

the connecting piece is rotationally connected with the mounting seat;

the folding piece comprises two connecting rods which are connected in a rotating way; the number of the folding pieces is two, and the folding pieces are both rotationally connected with one end of the connecting piece, which is far away from the mounting seat;

the clamp is used for clamping the tablet personal computer and is rotationally connected with one of the folding pieces;

and the lamp is used for irradiating the surrounding environment and is rotationally connected with the other folding piece.

2. The lighted tablet computer support of claim 1, wherein the fold further includes a first swivel joint for connecting the link and the light fixture;

the first rotary joint comprises a first joint and a second joint which are connected in a rotary way; the rotating shafts of the first joint and the second joint are first shafts; the first joint and the second joint are respectively provided with a second shaft perpendicular to the first shaft; wherein,

the connecting rod is rotationally connected with the first joint around the axis of the first shaft; the lamp is rotationally connected with the second joint around the axis of the second shaft.

3. The lighted tablet computer support of claim 2, wherein the light fixture includes a light body and a support; the lamp body is arranged on the support; the support is rotatably connected with the second joint around the axis of the second shaft.

4. The tablet personal computer support with a lamp according to claim 3, wherein the lamp body is in a long strip shape; the support is provided with a guide plate which is used for guiding a part of light rays emitted by the lamp body; the guide plate is positioned on the side face of the lamp body, and the long side of the guide plate is parallel to the axis of the lamp body.

5. The lighted tablet computer support of claim 1, wherein the folder further includes a second swivel joint for connecting the link and the clamp;

the second rotary joint comprises a third joint and a fourth joint which are connected in a rotating way; the rotating shafts of the third joint and the fourth joint are third shafts; the fourth joint is provided with a fourth shaft perpendicular to the third shaft; wherein,

the clamp is rotationally connected with the fourth joint around the axis of the fourth shaft; the connecting rod is fixedly connected with the third joint.

6. The tablet computer holder with lamp of claim 5, wherein the clamp further comprises a connecting base, clamping jaws, a guide rod, and an adjustment mechanism; the connecting seat is arranged on the fourth connector; the number of the clamping claws is one pair, and each clamping claw is connected with at least one guide rod; the guide rod is arranged on the connecting seat in a sliding manner; the adjusting mechanism is arranged on the connecting seat and is positioned between the pair of clamping claws; the adjusting mechanism is used for driving the guide rod to axially move along the guide rod so as to clamp or unclamp the tablet personal computer by the pair of clamping claws.

7. The lighted tablet computer support of claim 6, wherein the adjustment mechanism includes a first knob, a rack, and a pinion; the first knob is rotationally connected with the connecting seat; the gear is axially connected with the first knob; the centers of the racks are distributed on two sides of the first knob, the two racks are respectively connected with the guide rod on one clamping claw, and the long side of each rack is parallel to the axis of the guide rod; any one of the racks is meshed with the gear.

8. The tablet personal computer holder with lamp of claim 6, wherein the adjustment mechanism further comprises a slider, a swing link, and a second knob; the second knob is rotationally connected with the connecting seat; the number centers of the pair of sliding blocks are distributed on two sides of the second knob; the two sliding blocks are respectively connected with the guide rod on one of the clamping claws, and each sliding block is slidably arranged on the connecting seat; the center of the pair of swing rods is symmetrically distributed on two sides of the second knob, one end of any swing rod is rotationally connected with the sliding block, and the other end of any swing rod is rotationally connected with the second knob.