CN111251558B

CN111251558B - Clamping device

Info

Publication number: CN111251558B
Application number: CN202010042691.7A
Authority: CN
Inventors: 郭成贤; 施伟达; 戴海洋; 袁祖杰; 雷果; 徐庆忠
Original assignee: Zhejiang Qiangwei Hardware Co ltd
Current assignee: Zhejiang Qiangwei Hardware Co ltd
Priority date: 2020-01-15
Filing date: 2020-01-15
Publication date: 2021-08-31
Anticipated expiration: 2040-01-15
Also published as: CN111251558A

Abstract

The invention relates to a clamping device, which comprises a rack, a rotating seat rotationally arranged on the side wall of the rack, and a rotating cylinder arranged between the rotating seat and the rack, wherein one end of the rotating cylinder is rotationally connected with the rack, the other end of the rotating cylinder is rotationally connected with the rotating seat, a support is horizontally and fixedly arranged on the rotating seat, a clamping cylinder is arranged on the support in a sliding manner along the axial direction of the support, the clamping cylinder is vertically arranged, a piston rod of the clamping cylinder faces the ground, and a clamping device is arranged at the end part of the piston rod of the clamping cylinder.

Description

Clamping device

Technical Field

The invention relates to the technical field of waste collecting equipment of injection molding machines, in particular to a clamping device.

Background

The injection molding machine needs to take out the finished product from the grinding tool after the injection molding machine finishes injection molding so that the injection molding machine can carry out next injection molding, if the finished product can be taken out from the grinding tool very fast, the injection molding machine can carry out next injection molding faster, and the work efficiency of the injection molding machine is improved.

Chinese patent with grant publication number CN106956257B discloses a manipulator, including the support, locate first drive arrangement on the support, movably install in the support and the slip table be connected with first drive arrangement, set firmly second drive arrangement on the slip table and the grabbing device who is connected with second drive arrangement, the slip table is equipped with and is used for detecting the first detection device of slip table travel, grabbing device is equipped with and is used for detecting the second detection device that grabbing device snatched the state. The manipulator automatically grabs the product through the mutual matching of the first driving device, the second driving device and the grabbing device, the grabbing speed is high, and the grabbing efficiency is high; first detection device and second detection device carry out real time monitoring to slip table and grabbing device respectively, avoid slip table action unusual or grabbing of grabbing device unusual to cause the damage to the product, have guaranteed to snatch the quality.

The manipulator is suitable for clamping various batteries and is not suitable for rubber injection products.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the clamping device which can quickly take out a formed product in the extruding machine and improve the production efficiency of the extruding machine.

The above object of the present invention is achieved by the following technical solutions: the utility model provides a clamping device, include the frame, the rotatory roating seat that sets up on the frame lateral wall the roating seat with be provided with revolving cylinder between the frame, revolving cylinder one end with frame swivelling joint, the other end with the roating seat rotates the connection, the fixed support that is provided with of roating seat upper level, it is provided with the centre gripping cylinder along its endwise slip on the support, the vertical setting of centre gripping cylinder and its piston rod set up towards ground, the tailpiece of the piston rod portion of centre gripping cylinder is provided with and holds the device.

By adopting the technical scheme, the machine frame is used as a support of the whole clamping device, when the device works and two grinding tools are separated after the plastic extruding machine completes injection molding, the clamping cylinder slides towards the support along the axial direction of the support, the clamping cylinder extends out of the piston rod to enable the piston rod to extend into the plastic extruding machine, then the clamping device clamps a formed product, the clamping cylinder slides away from the support along the axial direction of the support to pull the formed product in the mold out of the mold, the clamping cylinder withdraws the piston rod to enable the piston rod to be positioned outside the plastic extruding machine, then the rotating cylinder extends out of the piston rod to drive the rotating seat to rotate, further the support is driven to rotate to enable the clamping cylinder arranged on the support to rotate around the rotating connection point of the support and the rotating seat, at the moment, the clamping flag rod is in an inclined state, then the clamping cylinder extends out of the piston rod to enable the clamping device arranged at the end part of the piston rod to be positioned at one side of the plastic extruding machine, at last clamping device loosens the shaping product, and the shaping product will drop to the outside of extruding machine, and clamping device withdraws the piston rod at last, and revolving cylinder withdraws the piston rod and makes the support rotatory to horizontal position around the roating seat, and inside having taken out the extruding machine through the quick shaping product in the extruding machine of the device like this, improved the production efficiency of extruding machine.

The present invention in a preferred example may be further configured to: the adjusting device is characterized in that an adjusting rod is rotatably arranged on the peripheral wall of one end, connected with the rotating seat, of the rotating cylinder, an adjusting groove is formed in the rotating seat corresponding to the adjusting rod, the adjusting groove is located on an arc formed by taking the rotating point of the rotating cylinder and the rack as the circle center, and a fixing device is arranged between the adjusting rod and the adjusting groove.

By adopting the technical scheme, the adjusting groove is positioned on the arc formed by taking the rotating point of the rotating cylinder and the rack as the circle center, so that the adjusting rod can slide in the adjusting groove, but the distance between the adjusting rod and the rotating point of the rotating seat and the rack can be changed after the adjusting rod slides in the adjusting groove, the rotating angle of the rotating seat around the rack can be changed after the rotating cylinder extends out of the piston rod, the inclined angle of the clamping cylinder after the rotating seat rotates is changed, the distance between the clamping device and the extruding machine after the rotating seat rotates around the rotating point of the clamping cylinder and the rack can be different, and the applicability of the device is improved.

The present invention in a preferred example may be further configured to: the fixing device comprises a fixing hole formed in the adjusting rod along the axial direction of the adjusting rod, the fixing hole is communicated with the adjusting groove, a clamping block is inserted into the fixing hole in a sliding mode, a clamping tooth I is arranged on the clamping block, a clamping tooth II is arranged on the peripheral wall of the adjusting groove corresponding to the clamping tooth I, and a tension spring is arranged between the clamping block and the bottom wall of the fixing hole.

Through adopting above-mentioned technical scheme, when adjusting the pole and sliding in the adjustment tank, extract the joint piece from the fixed orifices, it can slide in the adjustment tank to adjust the pole, after will adjusting the pole and adjusting required position, make the joint piece get back to the fixed orifices again, the joint tooth I that sets up on the joint piece will be right with the II meshing of the joint tooth that set up on the adjustment tank perisporium, tension spring's elasticity will keep the joint piece to be in the fixed orifices, accomplished like this and fixed between adjustment pole and the adjustment tank.

The present invention in a preferred example may be further configured to: the support is followed its axial is provided with two at least guide bars, it is provided with the mounting bracket to slide jointly on the guide bar, add hold the cylinder with mounting bracket fixed connection, the mounting bracket with the support is kept away from be provided with the slip cylinder between frame one end.

Through adopting above-mentioned technical scheme, when the centre gripping cylinder need remove along the axial of support, the sliding cylinder drives the mount through flexible its piston rod and slides on the guide bar, and then drives the axial of centre gripping cylinder along the support and removes, has realized like this that the centre gripping cylinder is along the axial removal of support.

The present invention in a preferred example may be further configured to: the clamping device comprises a propulsion cylinder, clamping plates fixedly arranged on any two opposite sides of a cylinder body of the propulsion cylinder, and two V-shaped clamping plates hinged between the two hinge sleeves, turning parts of the two V-shaped clamping plates are mutually abutted, the end part of a piston rod of the propulsion cylinder, which is arranged between the V-shaped clamping plates and the clamping plates, is conical, and the end part of the propulsion cylinder is positioned between the two clamping plates.

Through adopting above-mentioned technical scheme, when clamping device was to the shaping product centre gripping, the piston rod was stretched out to the propulsion cylinder, and the part that the conical setting of piston rod tip is because the diameter is bigger and bigger, will be close centre gripping cylinder one end to two V type grip blocks and produce the extrusion and make two V type grip blocks take place the rotation around its pin joint with the hinge cover, and the butt will take place for the one end that centre gripping cylinder was kept away from to two V type grip blocks, has realized the centre gripping to the shaping product like this.

The present invention in a preferred example may be further configured to: the support in be provided with pressure sensor I under the centre gripping cylinder, the centre gripping cylinder corresponds pressure sensor I is provided with presses clamp plate I, be provided with pressure sensor II on the mounting bracket, correspond in the frame pressure sensor II is provided with presses clamp plate II, it is provided with pressure sensor III to articulate to sheathe in, it corresponds to impel the cylinder pressure sensor is provided with and presses clamp plate III, pressure sensing 1 pressure sensor II with III electricity of pressure sensor are connected with the controller.

By adopting the technical scheme, when the device works, the sliding cylinder extends out of the piston rod to push the mounting seat to move towards the rack, after the pressure sensor II collides with the press plate II, the pressure sensor II feeds back signals to the controller, the controller controls the clamping cylinder to extend out of the piston rod, when the piston rod of the clamping cylinder drives the press plate I to press the pressure sensor I, the pressure sensor I feeds back the signals to the controller, the controller controls the pushing cylinder to extend out of the piston rod to clamp a molded product, the piston rod of the pushing cylinder drives the press plate III to press the pressure sensor III, the pressure sensor III feeds back the signals to the controller, the controller controls the clamping cylinder to withdraw the piston rod and controls the rotating cylinder to extend out of the piston rod to enable the rotating seat to rotate, the pressure sensor I feeds back the signals to the controller after losing pressure, and the controller controls the clamping cylinder to extend out of the piston rod and then push the piston rod of the pushing cylinder to withdraw the piston rod, and releasing the molded product clamped by the V-shaped clamping plate, controlling the clamping cylinder to withdraw the piston rod and controlling the rotary cylinder to withdraw the piston rod and controlling the sliding cylinder to withdraw the piston rod by the controller after the pressure sensor III loses pressure, and enabling the controller to return to zero to start the next round of clamping action after the pressure sensor II loses pressure.

The present invention in a preferred example may be further configured to: two the V type grip block with all be provided with the torsional spring between the grip block, resilient means makes two the V type grip block butt impels the one end of cylinder piston rod to have the trend of mutual butt.

Through adopting above-mentioned technical scheme, when the piston rod was withdrawed to the propulsion cylinder, the one end that centre gripping cylinder was kept away from to two V type grip blocks under the effect of torsional spring will open gradually for two V type grip blocks are close the state that centre gripping cylinder one end was in the part that the butt was promoted cylinder piston rod circular cone and is set up always, have improved the reliability that the device work is like this.

The present invention in a preferred example may be further configured to: and a tension spring is arranged between the two V-shaped clamping plates, and the elastic device enables one ends of the piston rods of the propulsion cylinders, which are abutted against the two V-shaped clamping plates, to have the tendency of abutting against each other.

Through adopting above-mentioned technical scheme, when the propulsion cylinder withdraws the piston rod, the one end that the centre gripping cylinder was kept away from to two V type grip blocks under tension spring's effect will open gradually for two V type grip blocks are close the state that centre gripping cylinder one end was in the part that the butt propulsion cylinder piston rod circular cone set up always, have improved the reliability that the device work is like this.

In summary, the invention includes at least one of the following beneficial technical effects:

1. the plastic extruding machine is used for rapidly taking out a molded product in the plastic extruding machine through the matching of the machine frame, the rotating seat, the rotating cylinder, the clamping cylinder and the clamping device, so that the production efficiency of the plastic extruding machine is improved;

2. the rotating angle of the rotating seat around the rack is changed after the rotating cylinder extends out of the piston rod, so that the inclined angle of the clamping cylinder after the rotating seat rotates is changed, the distance between the clamping device and the extruding machine after the rotating seat rotates around the rotating point of the clamping cylinder and the rack is different, and the applicability of the clamping device is improved.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a partial structural schematic view of the present invention, which is intended to show the adjusting lever, the fixing hole, the clamping block and the tension spring.

Fig. 3 is a schematic structural diagram of an elastic device according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of an elastic device according to a second embodiment of the present invention.

In the figure, 1, a frame; 11. a rotating base; 111. an adjustment groove; 12. a rotating cylinder; 13. pressing a plate II; 2. a support; 21. a clamping cylinder; 211. pressing the plate I; 22. a holding device; 221. propelling the cylinder; 2211. a pressing plate III; 222. a hinge sleeve; 2221. a pressure sensor III; 223. a V-shaped clamping plate; 224. an elastic device; 23. a guide bar; 231. a mounting frame; 2311. a pressure sensor II; 232. a slide cylinder; 24. a pressure sensor I; 32. a clamping block; 321. a clamping tooth I; 322. a tension spring; 33. and a clamping tooth II.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example one

Referring to fig. 1, the clamping device disclosed by the invention comprises a frame 1, a rotating seat 11 rotatably arranged on the side wall of the frame 1, and a rotating cylinder 12 arranged between the rotating seat 11 and the frame 1, wherein one end of the rotating cylinder 12 is rotatably connected with the frame 1, the other end of the rotating cylinder 12 is rotatably connected with the rotating seat 11, a support 2 is horizontally and fixedly arranged on the rotating seat 11, a clamping cylinder 21 is arranged on the support 2 in a sliding manner along the axial direction of the support, the clamping cylinder 21 is vertically arranged, a piston rod of the clamping cylinder is arranged towards the ground, and a clamping device 22 is arranged at the end part of the piston rod of the clamping cylinder 21. In this embodiment, the rotary base 11 and the rotary cylinder 12 are connected by a hollow rivet.

Referring to fig. 1 and 2, an adjusting rod is rotatably disposed on a circumferential wall of one end of the rotating cylinder 12 connected to the rotating base 11, an adjusting groove 111 is disposed on the rotating base 11 corresponding to the adjusting rod, the adjusting groove 111 is located on an arc formed by a circle center of the rotating connection between the rotating cylinder 12 and the frame 1, and a fixing device is disposed between the adjusting rod and the adjusting groove 111. Fixing device sets up the fixed orifices of seting up including adjusting the pole along its axial, and fixed orifices intercommunication adjustment tank 111 sets up, and it has joint piece 32 to slide the grafting in the fixed orifices, is provided with joint tooth I321 on the joint piece 32, corresponds joint tooth I321 on the perisporium of adjustment tank 111 and is provided with joint tooth II 33, is provided with tension spring 322 between the diapire of joint piece 32 and fixed orifices. In this embodiment, adjust the pole and set up to waist type pole, the arc of adjusting the pole is unanimous with the arc of adjustment tank 111, and the joint piece 32 all is provided with joint tooth I321 through the both sides of the mutual butt of fixed orifices and adjustment tank 111 cell wall.

Referring to fig. 1 and 3, the support 2 is provided with at least two guide rods 23 along the axial direction thereof, the guide rods 23 are provided with an installation frame 231 in a sliding manner, the holding cylinder 21 is fixedly connected with the installation frame 231, and a sliding cylinder 232 is arranged between the installation frame 231 and one end of the support 2 far away from the rack 1. The clamping device 22 comprises a propelling cylinder 221, hinged sleeves 222 fixedly arranged on any two opposite sides of a cylinder body of the propelling cylinder 221, and two V-shaped clamping plates 223 hinged between the two hinged sleeves 222, wherein the turning parts of the two V-shaped clamping plates 223 are mutually abutted, the end part of a piston rod of the propelling cylinder 221 is conical, and the end part of the propelling cylinder 221 is positioned between the two clamping plates.

Referring to fig. 1, a pressure sensor i 24 is arranged right below a clamping cylinder 21 on a support 2, a pressing plate i 211 is arranged on the clamping cylinder 21 corresponding to the pressure sensor i 24, a pressure sensor ii 2311 is arranged on a mounting frame 231, a pressing plate ii 13 is arranged on a rack 1 corresponding to the pressure sensor ii 2311, a pressure sensor iii 2221 is arranged on a hinge sleeve 222, a pressing plate iii 2211 is arranged on a pushing cylinder 221 corresponding to the pressure sensor, and the pressure sensor 1, the pressure sensor ii 2311 and the pressure sensor iii 2221 are electrically connected with a controller.

Referring to fig. 3, elastic devices 224 are disposed between the two V-shaped clamping plates 223 and the clamping plates, and the elastic devices 224 make one ends of the piston rods of the two V-shaped clamping plates 223 abut against and push the cylinder 221 to have a tendency of abutting against each other. In this embodiment, the elastic means 224 is provided as a torsion spring.

The implementation principle of the embodiment is as follows: the machine frame 1 is used as a support of the whole clamping device, when the device works, when the plastic extruding machine finishes the separation of two grinding tools, the clamping cylinder 21 is driven by the sliding cylinder 232 to slide on the guide rod 23 along the axial direction of the support 2 towards the support 2, after the pressure sensor II 2311 collides with the pressing plate II 13, the pressure sensor II 2311 feeds back a signal to the controller, the controller controls the clamping cylinder 21 to extend out of the piston rod to enable the piston rod to go deep into the plastic extruding machine,

when the piston rod of the clamping cylinder 21 drives the pressing plate I211 to press the pressure sensor I24, the pressure sensor I24 feeds back a signal to the controller, then the pushing cylinder 221 extends out of the piston rod, the conical part of the end part of the piston rod of the pushing cylinder 221 is larger and larger in diameter, so that one end of the two V-shaped clamping plates 223, which is close to the clamping cylinder 21, is pressed to enable the two V-shaped clamping plates 223 to rotate around the hinge point of the two V-shaped clamping plates 223 and the hinge sleeve 222, one ends of the two V-shaped clamping plates 223, which are far away from the clamping cylinder 21, are abutted to clamp a formed product,

meanwhile, after the piston rod of the propulsion cylinder 221 drives the pressing plate III 2211 to press the pressure sensor III 2221, the pressure sensor III 2221 feeds back a signal to the controller, the controller controls the clamping cylinder 21 to withdraw the piston rod to pull the molded product in the mold out of the mold, so that the clamping device is positioned outside the extruding machine,

the rotary cylinder 12 is controlled to extend out of the piston rod to enable the rotary seat 11 to rotate, the support 2 is further driven to rotate to enable the clamping cylinder 21 arranged on the support 2 to rotate around a rotating connection point of the support 2 and the rotary seat 11, the clamping flagpole is in an inclined state at the moment, the pressure sensor I24 loses pressure and then feeds the pressure back to the controller, and the controller controls the clamping cylinder 21 to extend out of the piston rod to enable a clamping device arranged at the end part of the piston rod to be located on one side of the plastic extruding machine; the air cylinder 221 is pushed to retract the piston rod, the molded product clamped by the V-shaped clamping plate 223 is loosened, and the molded product falls to the outside of the plastic extruding machine; after the pressure sensor III 2221 loses pressure, the controller controls the clamping cylinder 21 to extend out of the piston rod, controls the rotary cylinder 12 to retract the piston rod and controls the sliding cylinder 232 to retract the piston rod, and after the pressure sensor II 2311 loses pressure, the controller returns to zero to start the next round of clamping action.

When the adjusting rod is adjusted in position, because the adjusting groove 111 is positioned on the arc formed by taking the rotating point of the rotating cylinder 12 and the frame 1 as the center of circle, the adjusting rod can slide in the adjusting groove 111, but the distance between the adjusting rod and the rotating point of the rotating base 11 and the frame 1 will change after the adjusting rod slides in the adjusting groove 111, the rotating angle of the rotating base 11 around the frame 1 will change after the rotating cylinder 12 extends out of the piston rod, so that the inclined angle of the clamping cylinder 21 after the rotating base 11 rotates changes, the clamping block 32 is pulled out from the fixed hole, the adjusting rod can slide in the adjusting groove 111, after the adjusting rod is adjusted to the required position, the clamping block 32 returns to the fixed hole again, the clamping teeth I321 arranged on the clamping block 32 are meshed with the clamping teeth II 33 arranged on the peripheral wall of the adjusting groove 111, the elasticity of the tension spring 322 will keep the clamping block 32 in the fixed hole, this completes the fixation between the adjustment lever and the adjustment groove 111.

Example two

Referring to fig. 4, the embodiment is identical to the first embodiment except that "an elastic device 224 is disposed between the two V-shaped clamping plates 223, and the elastic device 224 makes one ends of the piston rods of the two V-shaped clamping plates 223 abut against and push the cylinder 221 have a tendency of abutting against each other". In this embodiment, the elastic means 224 is provided as a spring.

The implementation principle of the embodiment is as follows: after the propulsion cylinder 221 retracts the piston rod, the spring arranged between the two V-shaped clamping plates 223 makes the two V-shaped clamping plates 223 abut against one end of the piston rod of the propulsion cylinder 221 and move towards each other through elastic force, so that one ends of the two V-shaped clamping plates 223 far away from the propulsion cylinder 221 are opened again.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. A clamping device, characterized by: the clamping device comprises a rack (1), a rotating seat (11) rotatably arranged on the side wall of the rack (1), a rotating cylinder (12) arranged between the rotating seat (11) and the rack (1), wherein one end of the rotating cylinder (12) is rotatably connected with the rack (1), the other end of the rotating cylinder is rotatably connected with the rotating seat (11), a support (2) is horizontally and fixedly arranged on the rotating seat (11), a clamping cylinder (21) is axially and slidably arranged on the support (2), the clamping cylinder (21) is vertically arranged, a piston rod of the clamping cylinder faces the ground, and a clamping device (22) is arranged at the end part of the piston rod of the clamping cylinder (21); the support (2) is provided with at least two guide rods (23) along the axial direction of the support, the guide rods (23) are provided with a mounting frame (231) in a sliding mode, the clamping cylinder (21) is fixedly connected with the mounting frame (231), and a sliding cylinder (232) is arranged between the mounting frame (231) and one end, far away from the rack (1), of the support (2); the clamping device (22) comprises a propelling cylinder (221), hinged sleeves (222) fixedly arranged on any two opposite sides of a cylinder body of the propelling cylinder (221) and two V-shaped clamping plates (223) hinged between the two hinged sleeves (222), turning parts of the two V-shaped clamping plates (223) are mutually abutted, the end part of a piston rod of the propelling cylinder (221) is conical, and the end part of the propelling cylinder (221) is positioned between the two clamping plates; a pressure sensor I (24) is arranged right below the clamping cylinder (21) on the support (2), a pressing plate I (211) is arranged on the clamping cylinder (21) corresponding to the pressure sensor I (24), a pressure sensor II (2311) is arranged on the mounting frame (231), a pressing plate II (13) is arranged on the rack (1) corresponding to the pressure sensor II (2311), a pressure sensor III (2221) is arranged on the hinge sleeve (222), a pressing plate III (2211) is arranged on the propulsion cylinder (221) corresponding to the pressure sensor III (2221), and the pressure sensor I (24), the pressure sensor II (2311) and the pressure sensor III (2221) are electrically connected with a controller;

starting a sliding cylinder (232), enabling a clamping cylinder (21) to slide towards a support (2) along the axial direction of the support (2) on a guide rod (23) under the driving of the sliding cylinder (232), feeding a signal back to a controller by a pressure sensor II (2311) after the pressure sensor II (2311) collides with a pressing plate II (13), and controlling the clamping cylinder (21) to extend out of a piston rod by the controller;

when a piston rod of the clamping cylinder (21) drives the pressing plate I (211) to press the pressure sensor I (24), the pressure sensor I (24) feeds back a signal to the controller, and then the air cylinder (221) is pushed to extend out of the piston rod; when a piston rod of the propulsion cylinder (221) drives the pressing plate III (2211) to press the pressure sensor III (2221), the pressure sensor III (2221) feeds a signal back to the controller, the controller controls the clamping cylinder (21) to withdraw the piston rod, controls the rotating cylinder (12) to extend out of the piston rod to enable the rotating seat (11) to rotate, further drives the support (2) to rotate to enable the clamping cylinder (21) arranged on the support (2) to rotate around a rotating connection point of the support (2) and the rotating seat (11), and at the moment, the clamping cylinder (21) is in an inclined state;

when the pressure sensor I (24) loses pressure and then feeds back the pressure to the controller, the controller controls the clamping cylinder (21) to extend out of the piston rod to enable the clamping device arranged at the end part of the piston rod to be positioned at one side of the extruding machine, and the air cylinder (221) is pushed to retract the piston rod;

when the pressure sensor III (2221) loses pressure, the controller controls the clamping cylinder (21) to extend out of the piston rod, controls the rotating cylinder (12) to retract the piston rod and controls the sliding cylinder (232) to retract the piston rod, and after the pressure sensor II (2311) loses pressure, the controller returns to zero to start the next round of clamping action.

2. A clamping device as claimed in claim 1, characterized in that: the rotary air cylinder (12) is rotatably provided with an adjusting rod on the peripheral wall of one end connected with the rotary base (11), the rotary base (11) is provided with an adjusting groove (111) corresponding to the adjusting rod, the adjusting groove (111) is positioned on an arc formed by the rotary air cylinder (12) and the center of a circle of the rack (1) in a rotary connection manner, and a fixing device is arranged between the adjusting rod and the adjusting groove (111).

3. A clamping device as claimed in claim 2, characterized in that: fixing device (3) include adjust the pole and set up the fixed orifices of seting up along its axial, the fixed orifices intercommunication adjustment tank (111) set up, it has joint piece (32) to slide the grafting in the fixed orifices, be provided with joint tooth I (321) on joint piece (32), correspond on the perisporium of adjustment tank (111) joint tooth I (321) are provided with joint tooth II (33), joint piece (32) with be provided with tension spring (322) between the diapire of fixed orifices.

4. A clamping device as claimed in claim 1, characterized in that: elastic devices (224) are arranged on the two V-shaped clamping plates (223), and the elastic devices (224) enable one ends of piston rods of the two V-shaped clamping plates (223) in abutting connection and propelling cylinders (221) to have a tendency of abutting connection.

5. A clamping device as claimed in claim 1, characterized in that: an elastic device (224) is arranged between the two V-shaped clamping plates (223), and the elastic device (224) enables one ends of the piston rods of the two V-shaped clamping plates (223) to be abutted and pushed into the cylinder (221) to have the tendency of being abutted with each other.