CN113369725A - A laser cutting device for square pipe is convenient for press from both sides tightly - Google Patents

Abstract

The invention relates to a laser cutting device convenient for clamping a square tube, which comprises a main body, a bracket, a clamping mechanism and a rotating mechanism, wherein the main body is arranged on the bracket, the rotating mechanism is arranged on the clamping mechanism, the clamping mechanism comprises a turntable, a clamping component, a moving component and a pulling component, the rotating mechanism comprises a motor, a driving shaft, a large gear and a small gear, a locking unit is arranged on a handle, a positioning unit is arranged on a first pull rope, a supporting unit is arranged on a fixing plate, the laser cutting device convenient for clamping the square tube realizes the clamping of a workpiece through the clamping mechanism, the rotation of the workpiece is realized through the rotating mechanism, the cutting of the workpiece is realized through the main body, the clamping mechanism can realize the clamping of the workpiece through simple rotation, the use of tools such as a spanner is avoided, the labor is saved, the efficiency is improved, and meanwhile, the restoring force of a spring is adopted as the clamping force, the rigid clamping and scratching of the workpiece are avoided, and the workpiece is protected.

Description

A laser cutting device for square pipe is convenient for press from both sides tightly

Technical Field

The invention relates to a laser cutting device used for square pipes and convenient to clamp.

Background

The laser cutting device is a device which utilizes focused high-power-density laser beams to irradiate a workpiece, so that the irradiated materials are quickly melted, vaporized and ablated or reach a burning point, and simultaneously, molten substances are blown off by high-speed airflow coaxial with the beams, so that the workpiece is cut, and the laser cutting belongs to one of thermal cutting methods.

The existing laser cutting device generally adopts a chuck to clamp and fix, adopts rigid clamping, is easy to scratch a patterned workpiece and even causes workpiece damage, and simultaneously needs tools such as a wrench to screw when the chuck is used for clamping, so that the operation is inconvenient and large manpower is consumed.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: in order to overcome the defects of the prior art, the laser cutting device for the square pipe is convenient to clamp.

The technical scheme adopted by the invention for solving the technical problems is as follows: a laser cutting device convenient for clamping of a square tube comprises a main body, a support, two clamping mechanisms and a rotating mechanism, wherein the main body is arranged on the support;

the clamping mechanism comprises a rotary disc, a clamping assembly, a moving assembly and a pulling assembly, the rotary disc is arranged on a support, a square hole is formed in the rotary disc, the clamping assembly is arranged at the square hole, the clamping assembly comprises four clamping units, the included angle formed by two adjacent clamping units is 90 degrees, the clamping units comprise push rods, a moving frame, a roller and first springs, sliding grooves are formed in the through holes, one ends of the push rods are located in the sliding grooves, the other ends of the push rods extend out of the sliding grooves, the push rods are in sliding connection with the sliding grooves, the moving frame is arranged at one ends of the push rods located outside the sliding grooves, the roller is arranged in the moving frame, the first springs are arranged in the sliding grooves, one ends of the first springs are connected with the sliding grooves, the other ends of the first springs can be connected with the push rods, the moving assembly comprises four moving units, and the four moving units are respectively arranged corresponding to the four clamping units, the moving unit comprises a lead screw and rotating wheels, the lead screw penetrates through a push rod, the lead screw is in threaded connection with the push rod, the rotating wheels are arranged at one end, away from the push rod, of the lead screw, the rotating wheels are in key connection with the lead screw, the pulling assembly comprises a rotating unit and a pulling unit, the rotating unit comprises a handle, two rotating shafts, wire coils and a first pull rope, the rotating shafts are arranged on rotating discs, the handle is arranged on the rotating shafts, the number of the wire coils is two, the two wire coils are sleeved on the rotating shafts, the wire coils are in key connection with the rotating shafts, one end of the first pull rope is connected with one of the wire coils, the other end of the first pull rope is connected with the other wire coil, the first pull rope sequentially bypasses four rotating wheels;

rotary mechanism includes motor, drive shaft, gear wheel and pinion, the motor level sets up on the support, the drive shaft is installed on the motor, the gear wheel has two, and two big racks are established respectively on two carousels, gear wheel and carousel key-type connection, the pinion has two, and two pinions correspond the setting with two gear wheels respectively, the pinion cover is established in the drive shaft, pinion and drive shaft key-type connection, pinion and gear engagement.

In order to lock the handle, keep the clamping state to the work piece, be equipped with the locking unit on hand, the locking unit includes lock pipe, locking lever, second spring and second stay cord, the lock pipe sets up on hand, the one end of locking lever is located the lock pipe, the other end of locking lever stretches out outside the lock pipe, locking lever and lock pipe sliding connection, be equipped with a plurality of lockholes on the carousel, each lockhole is located same circumference, and each lockhole evenly sets up, the locking lever stretches out the outside one end of lock pipe and is located one of them lockhole, the second spring sets up in the lock pipe, the one end and the locking lever of second spring are connected, the other end and the lock union coupling of second spring, the one end of second stay cord is located the lock pipe and is connected with the locking lever, the other end of second stay cord stretches out the lock pipe.

In order to better limit the movement of the first pull rope, the first pull rope is provided with four positioning units, the four positioning units are respectively arranged corresponding to the four rotating wheels, each positioning unit comprises two positioning wheels, the two positioning wheels are respectively arranged on two sides of each rotating wheel, and the first pull rope bypasses the two positioning wheels.

In order to support the device, the support comprises a base and two fixed plates, the fixed plates are arranged on the base, through holes are formed in the fixed plates and are coaxial with the square holes, and the two fixed plates are respectively arranged corresponding to the two turnplates.

In order to support the clamping mechanism, be equipped with the supporting element on the fixed plate, the supporting element has four, and the contained angle that two adjacent supporting elements formed is 90, the supporting element includes fixed axle and spacing round, the fixed axle sets up on the fixed plate, be equipped with the ring channel on the carousel, the ring channel sets up with the carousel is coaxial, the fixed axle is kept away from the one end of fixed plate and is stretched out in the ring channel, spacing round of cover is established on the fixed axle, spacing round is connected with the fixed axle key, spacing round is located the ring channel, spacing round and ring channel roll connection.

In order to better limit the rotation of the rotary disc, a limit groove is arranged in the annular groove, the limit groove is annular, the limit wheel is positioned in the limit groove, and the limit wheel is in rolling connection with the limit groove.

In order to carry out better spacing to the removal of push rod, be equipped with the slider on the push rod, be equipped with the bar groove in the spout, the slider is located the bar inslot, slider and bar groove sliding connection.

In order to carry out better spacing to the removal of push rod, the slider has two, and two sliders set up respectively in the both sides of push rod, the bar groove has two, and two sliders are located two bar inslots respectively.

The laser cutting device for the square pipe convenient to clamp has the advantages that the clamping of the workpiece is realized through the clamping mechanism, the rotation of the workpiece is realized through the rotating mechanism, and the cutting of the workpiece is realized through the main body.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic structural view of a laser cutting device for square pipes for facilitating clamping of the same according to the present invention;

FIG. 2 is a schematic structural diagram of a clamping mechanism and a rotating mechanism of the laser cutting device for square pipes, which is convenient for clamping;

FIG. 3 is a schematic view of a connection structure of a turntable and a clamping assembly of the laser cutting device for square pipes, which is convenient for clamping;

FIG. 4 is a schematic structural view of a locking unit of the laser cutting device for square pipes for facilitating clamping of the same according to the present invention;

FIG. 5 is a schematic structural view of a supporting unit of the clamping-facilitating laser cutting apparatus for square pipes according to the present invention;

in the figure: 1. the automatic locking device comprises a main body, 2. a rotating disc, 3. a push rod, 4. a moving frame, 5. a roller, 6. a first spring, 7. a screw rod, 8. a rotating wheel, 9. a handle, 10. a rotating shaft, 11. a wire coil, 12. a first pull rope, 13. a motor, 14. a driving shaft, 15. a large gear, 16. a small gear, 17. a locking pipe, 18. a locking rod, 19. a second spring, 20. a second pull rope, 21. a positioning wheel, 22. a base, 23. a fixing plate, 24. a fixing shaft, 25. a limiting wheel and 26. a sliding block.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

As shown in fig. 1, a laser cutting device for a square tube, which is convenient to clamp, comprises a main body 1, a support, two clamping mechanisms and a rotating mechanism, wherein the main body 1 is arranged on the support, the two clamping mechanisms are respectively arranged at two ends of the support, and the rotating mechanism is arranged on the clamping mechanisms;

when the device is used, the workpiece is clamped through the clamping mechanism, the workpiece is cut through the main body 1, the clamping mechanism rotates through the rotating mechanism, the workpiece rotates, and the rotating workpiece is cut through the main body 1.

As shown in fig. 2-3, the clamping mechanism includes a rotary table 2, a clamping assembly, a moving assembly and a pulling assembly, the rotary table 2 is disposed on the support, a square hole is disposed on the rotary table 2, the clamping assembly is disposed at the square hole, the clamping assembly includes four clamping units, an included angle formed by two adjacent clamping units is 90 °, the clamping unit includes a push rod 3, a moving frame 4, a roller 5 and a first spring 6, a sliding slot is disposed in the through hole, one end of the push rod 3 is disposed in the sliding slot, the other end of the push rod 3 extends out of the sliding slot, the push rod 3 is slidably connected with the sliding slot, the moving frame 4 is disposed at one end of the push rod 3 outside the sliding slot, the roller 5 is disposed in the moving frame 4, the first spring 6 is disposed in the sliding slot, one end of the first spring 6 is connected with the sliding slot, and the other end of the first spring 6 can be connected with the push rod 3, the moving assembly comprises four moving units, the four moving units are respectively arranged corresponding to the four clamping units, the moving units comprise a lead screw 7 and a rotating wheel 8, the lead screw 7 penetrates through the push rod 3, the lead screw 7 is in threaded connection with the push rod 3, the rotating wheel 8 is arranged at one end, far away from the push rod 3, of the lead screw 7, the rotating wheel 8 is in key connection with the lead screw 7, the pulling assembly comprises a rotating unit and a pulling unit, the rotating unit comprises a handle 9, a rotating shaft 10, two wire coils 11 and a first pull rope 12, the rotating shaft 10 is arranged on the turntable 2, the handle 9 is arranged on the rotating shaft 10, the number of the wire coils 11 is two, the two wire coils 11 are sleeved on the rotating shaft 10, the wire coils 11 are in key connection with the rotating shaft 10, one end of the first pull rope 12 is connected with one of the wire coils 11, and the other end of the first pull rope 12 is connected with the other wire coil 11, the first pull rope 12 sequentially winds around the four rotating wheels 8, and a circle of the first pull rope 12 is wound on each rotating wheel 8;

the handle 9 is rotated, the handle 9 drives the rotating shaft 10 to rotate, the rotating shaft 10 drives the two wire coils 11 to rotate, so that the first pull rope 12 is wound on the other wire coil 11 by one wire coil 11, so that the first pull rope 12 moves, the first pull rope 12 is wound on each rotating wheel 8 for one circle, so that each rotating wheel 8 is driven to rotate under the action of friction force, the rotating wheel 8 drives the screw rod 7 to rotate, the screw rod 7 drives the push rod 3 to move, the push rod 3 drives the moving frame 4 to move, the moving frame 4 drives the rollers 5 to move, so that enough space is reserved between the rollers 5, then a workpiece passes through a square hole, the handle 9 is released, at the moment, the first spring 6 is in a deformation state, the restoring force of the first spring 6 generates reverse thrust on the push rod 3, so that the push rod 3 moves in the reverse direction, the push rod 3 drives the moving frame 4 to move in the reverse direction, the moving frame 4 drives the rollers 5 to move in the reverse direction, thereby make each cylinder 5 paste four sides of tight work piece, thereby press from both sides tightly the work piece, the work piece presss from both sides tightly the back, can continue reverse rotation handle 9, thereby make 12 reverse rotations of first stay cord, 12 drive runner 8 reverse rotations of first stay cord, 8 drive lead screw 7 reverse rotations of runner, 3 reverse movements of 7 drive push rods of lead screw, thereby make cylinder 5 continue to remove towards the work piece direction, thereby realize the better tight work piece of subsides of cylinder 5, thereby realize better tight effect of clamp, here push rod 3 removes drive slider 26 and removes, slider 26 is located the bar inslot, thereby make slider 26 only can remove along the axis direction in bar groove, thereby it is spacing to the removal of slider 26, thereby carry out better spacing to the removal of push rod 3.

As shown in fig. 2, rotary mechanism includes motor 13, drive shaft 14, gear wheel 15 and pinion 16, motor 13 level sets up on the support, drive shaft 14 is installed on motor 13, gear wheel 15 has two, and two big racks overlap respectively on two carousels, gear wheel 15 and carousel key-type connection, pinion 16 has two, and two pinion 16 correspond the setting with two gear wheels 15 respectively, pinion 16 overlaps on drive shaft 14, pinion 16 and 14 key-type connections of drive shaft, pinion 16 and gear wheel 15 mesh.

The motor 13 is operated, the motor 13 drives the driving shaft 14 to rotate, the driving shaft 14 drives the small gear 16 to rotate, the small gear 16 drives the large gear 15 to rotate, and the large gear 15 drives the rotary table to rotate, so that each clamping mechanism on the rotary table rotates, the workpiece rotates, the main body 1 is opposite to each position of the workpiece, and the workpiece is subjected to circular cutting.

As shown in fig. 4, in order to lock the handle 9, maintaining the clamped state of the workpiece, a locking unit is provided on the handle 9, the locking unit includes a lock tube 17, a lock lever 18, a second spring 19 and a second pulling rope 20, the lock tube 17 is arranged on the handle 9, one end of the lock rod 18 is positioned in the lock tube 17, the other end of the lock rod 18 extends out of the lock tube 17, the lock rod 18 is connected with the lock tube 17 in a sliding way, the rotary table is provided with a plurality of lock holes, each lock hole is positioned on the same circumference, each lock hole is uniformly arranged, one end of the lock rod 18 extending out of the lock tube 17 is positioned in one of the lock holes, the second spring 19 is arranged in the lock tube 17, one end of the second spring 19 is connected with the lock rod 18, the other end of the second spring 19 is connected with the lock tube 17, one end of the second pull rope 20 is positioned in the lock tube 17 and connected with the lock rod 18, and the other end of the second pull rope 20 extends out of the lock tube 17.

When the handle 9 needs to be rotated, the second pull rope 20 is pulled, the second pull rope 20 drives the lock rod 18 to move, the lock rod 18 moves out of the lock hole, the lock rod 18 cannot be blocked, the handle 9 can rotate freely, the second pull rope 20 is loosened after the handle 9 is rotated, the second spring 19 is in a deformation state at the moment, the restoring force of the second spring 19 generates outward pushing force on the lock rod 18, the lock rod 18 is clamped into the corresponding lock hole, and the handle 9 is locked.

As shown in fig. 2, in order to better limit the movement of the first rope 12, the first rope 12 is provided with four positioning units, the four positioning units are respectively arranged corresponding to the four rotating wheels 8, each positioning unit includes two positioning wheels 21, the two positioning wheels 21 are respectively arranged at two sides of the rotating wheel 8, and the first rope 12 bypasses the two positioning wheels 21.

In order to support the device, the support comprises a base 22 and two fixing plates 23, the fixing plates 23 are arranged on the base 22, through holes are formed in the fixing plates 23 and are coaxial with the square holes, the number of the fixing plates 23 is two, and the two fixing plates 23 are respectively arranged corresponding to the two turntables.

As shown in fig. 5, in order to support fixture, be equipped with the supporting element on the fixed plate 23, the supporting element has four, and the contained angle that two adjacent supporting elements formed is 90, the supporting element includes fixed axle 24 and spacing wheel 25, fixed axle 24 sets up on fixed plate 23, be equipped with the ring channel on the carousel, the ring channel sets up with the carousel is coaxial, fixed axle 24 keeps away from in the one end of fixed plate 23 stretches out the ring channel, spacing wheel 25 cover is established on fixed axle 24, spacing wheel 25 and the 24 key-type connections of fixed axle, spacing wheel 25 is located the ring channel, spacing wheel 25 and ring channel roll connection.

Here, each of the limit wheels 25 is located in the limit groove to support the turntable, and at the same time, the limit wheels 25 can only move along the axis direction of the limit groove to limit the rotation of the turntable.

In order to better limit the rotation of the turntable, a limit groove is arranged in the annular groove, the limit groove is annular, the limit wheel 25 is positioned in the limit groove, and the limit wheel 25 is in rolling connection with the limit groove.

For carrying out better spacing to the removal of push rod 3, be equipped with slider 26 on the push rod 3, be equipped with the bar groove in the spout, slider 26 is located the bar inslot, slider 26 and bar groove sliding connection.

For carrying out better spacing to push rod 3's removal, slider 26 has two, and two sliders 26 set up respectively in push rod 3's both sides, the bar groove has two, and two sliders 26 are located two bar inslot respectively.

When the device is used, the second pull rope 20 is pulled, the second pull rope 20 drives the lock rod 18 to move, the lock rod 18 moves out of the lock hole, the lock rod 18 is not blocked, the handle 9 can rotate freely, then the handle 9 is rotated, the handle 9 drives the rotating shaft 10 to rotate, the rotating shaft 10 drives the two wire coils 11 to rotate, the first pull rope 12 is wound on the other wire coil 11 by one wire coil 11, the first pull rope 12 moves, the first pull rope 12 is wound on each rotating wheel 8 for one circle, each rotating wheel 8 is driven to rotate under the action of friction force, the rotating wheel 8 drives the screw rod 7 to rotate, the screw rod 7 drives the push rod 3 to move, the push rod 3 drives the movable frame 4 to move, the movable frame 4 drives the rollers 5 to move, enough space is reserved between the rollers 5, then the second pull rope 20 is loosened, and the second spring 19 is in a deformation state, the restoring force of the second spring 19 generates an outward pushing force on the lock rod 18, so that the lock rod 18 is clamped into the corresponding lock hole, so that the handle 9 is locked, so that the rollers 5 are kept in an open state, then the workpiece passes through the square hole, the second pull rope 20 is pulled again, so that the lock rod 18 moves out of the lock hole, so that the handle 9 can rotate freely, then the handle 9 is rotated reversely, at this time, the first spring 6 is in a deformation state, the restoring force of the first spring 6 generates a reverse pushing force on the push rod 3, so that the push rod 3 moves reversely, the push rod 3 drives the movable frame 4 to move reversely, the movable frame 4 drives the rollers 5 to move reversely, so that the rollers 5 cling to four sides of the workpiece, so that the workpiece is clamped, after the workpiece is clamped, the handle 9 can continue to rotate reversely, so that the first pull rope 12 rotates reversely, and the first pull rope 12 drives the rotating wheel 8 to rotate reversely, the rotating wheel 8 drives the screw rod 7 to rotate reversely, the screw rod 7 drives the push rod 3 to move reversely, so that the roller 5 continues to move towards the direction of the workpiece, so that the roller 5 can be better attached to the workpiece, and a better clamping effect is realized, here, the push rod 3 drives the sliding block 26 to move, the sliding block 26 is positioned in the strip-shaped groove, so that the sliding block 26 can only move along the axis direction of the strip-shaped groove, so that the movement of the sliding block 26 is limited, so that the movement of the push rod 3 is better limited, after the workpiece is clamped, the motor 13 is operated, the motor 13 drives the driving shaft 14 to rotate, the driving shaft 14 drives the pinion 16 to rotate, the pinion 16 drives the gearwheel 15 to rotate, the gearwheel 15 drives the turntable to rotate, so that each clamping mechanism on the turntable rotates, so that the workpiece rotates, so that the main body 1 is right opposite to each position of the workpiece, so as to perform circular cutting on the workpiece, here, each of the limit wheels 25 is located in the limit groove to support the turntable, and at the same time, the limit wheels 25 can only move along the axis direction of the limit groove to limit the rotation of the turntable.

Compared with the prior art, this a laser cutting device for square pipe is convenient for press from both sides tight, realize the clamp of work piece through fixture, realize the rotation of work piece through rotary mechanism, realize the cutting of work piece through main part 1, compare with current fixture, this mechanism can realize the clamp of work piece through simple rotation, avoid the use of tools such as spanner, saved the manpower, improved efficiency, this mechanism adopts the restoring force of spring as clamping-force simultaneously, avoid rigidity centre gripping to draw colored work piece, realize the protection to the work piece.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (8)

1. The laser cutting device convenient for clamping of the square tube is characterized by comprising a main body (1), a support, two clamping mechanisms and a rotating mechanism, wherein the main body (1) is arranged on the support, the two clamping mechanisms are respectively arranged at two ends of the support, and the rotating mechanism is arranged on the clamping mechanisms;

the clamping mechanism comprises a rotary table (2), a clamping assembly, a moving assembly and a pulling assembly, the rotary table (2) is arranged on a support, a square hole is formed in the rotary table (2), the clamping assembly is arranged at the square hole, the clamping assembly comprises four clamping units, an included angle formed by two adjacent clamping units is 90 degrees, each clamping unit comprises a push rod (3), a moving frame (4), a roller (5) and a first spring (6), a sliding groove is formed in each through hole, one end of each push rod (3) is located in each sliding groove, the other end of each push rod (3) extends out of each sliding groove, each push rod (3) is in sliding connection with each sliding groove, each moving frame (4) is arranged at one end, located outside each sliding groove, of each push rod (3), each roller (5) is arranged in each moving frame (4), each first spring (6) is arranged in each sliding groove, one end of each first spring (6) is connected with each sliding groove, the other end of first spring (6) can be connected with push rod (3), the removal subassembly includes four mobile unit, and four mobile unit correspond the setting with four centre gripping units respectively, the mobile unit includes lead screw (7) and runner (8), lead screw (7) pass push rod (3), lead screw (7) and push rod (3) threaded connection, runner (8) set up the one end of keeping away from push rod (3) in lead screw (7), runner (8) and lead screw (7) key-type connection, the pulling subassembly includes rotation unit and pulling unit, the rotation unit includes handle (9), pivot (10), drum (11) and first stay cord (12), pivot (10) set up on carousel (2), handle (9) set up on pivot (10), drum (11) have two, and two drum (11) are all established in pivot (10), the wire coil (11) is in key connection with the rotating shaft (10), one end of the first pull rope (12) is connected with one wire coil (11), the other end of the first pull rope (12) is connected with the other wire coil (11), the first pull rope (12) sequentially bypasses four rotating wheels (8), and the first pull rope (12) is wound on one rotating wheel (8) for one circle;

rotary mechanism includes motor (13), drive shaft (14), gear wheel (15) and pinion (16), motor (13) level sets up on the support, install on motor (13) drive shaft (14), gear wheel (15) have two, and two big racks are established respectively on two carousels, gear wheel (15) and carousel key-type connection, pinion (16) have two, and two pinion (16) correspond the setting with two gear wheel (15) respectively, pinion (16) cover is established on drive shaft (14), pinion (16) and drive shaft (14) key-type connection, pinion (16) and gear wheel (15) meshing.

2. The laser cutting device convenient for clamping of square pipe as claimed in claim 1, wherein the handle (9) is provided with a locking unit, the locking unit comprises a locking pipe (17), a locking rod (18), a second spring (19) and a second pull rope (20), the locking pipe (17) is arranged on the handle (9), one end of the locking rod (18) is arranged in the locking pipe (17), the other end of the locking rod (18) extends out of the locking pipe (17), the locking rod (18) is connected with the locking pipe (17) in a sliding manner, the turntable is provided with a plurality of locking holes, each locking hole is arranged on the same circumference, each locking hole is uniformly arranged, one end of the locking rod (18) extending out of the locking pipe (17) is arranged in one of the locking holes, the second spring (19) is arranged in the locking pipe (17), one end of the second spring (19) is connected with the locking rod (18), the other end of the second spring (19) is connected with the lock tube (17), one end of the second pull rope (20) is positioned in the lock tube (17) and connected with the lock rod (18), and the other end of the second pull rope (20) extends out of the lock tube (17).

3. The laser cutting device for square pipes convenient to clamp as claimed in claim 1, wherein the first pulling rope (12) is provided with four positioning units, the four positioning units are respectively arranged corresponding to the four rotating wheels (8), the positioning units comprise two positioning wheels (21), the two positioning wheels (21) are respectively arranged at two sides of the rotating wheels (8), and the first pulling rope (12) bypasses the two positioning wheels (21).

4. The laser cutting device for square pipes convenient to clamp as claimed in claim 1, wherein the support comprises a base (22) and two fixing plates (23), the fixing plates (23) are arranged on the base (22), the fixing plates (23) are provided with through holes, the through holes and the square holes are coaxially arranged, the number of the fixing plates (23) is two, and the two fixing plates (23) are respectively arranged corresponding to the two rotating discs.

5. The laser cutting device convenient for clamping of square pipe as claimed in claim 4, wherein there are four supporting units on the fixing plate (23), the included angle formed by two adjacent supporting units is 90 °, the supporting unit comprises a fixing shaft (24) and a spacing wheel (25), the fixing shaft (24) is disposed on the fixing plate (23), the rotating disc is provided with an annular groove, the annular groove is coaxially disposed with the rotating disc, one end of the fixing shaft (24) far away from the fixing plate (23) extends out of the annular groove, the spacing wheel (25) is sleeved on the fixing shaft (24), the spacing wheel (25) is in key connection with the fixing shaft (24), the spacing wheel (25) is located in the annular groove, and the spacing wheel (25) is in rolling connection with the annular groove.

6. The laser cutting device convenient for clamping of square tubes as claimed in claim 5, wherein the annular groove is internally provided with a limiting groove, the limiting groove is annular, the limiting wheel (25) is positioned in the limiting groove, and the limiting wheel (25) is in rolling connection with the limiting groove.

7. The laser cutting device convenient for clamping of square tubes as claimed in claim 1, wherein the push rod (3) is provided with a slide block (26), the slide groove is internally provided with a strip-shaped groove, the slide block (26) is positioned in the strip-shaped groove, and the slide block (26) is connected with the strip-shaped groove in a sliding manner.

8. The laser cutting device for square pipes convenient to clamp as claimed in claim 7, wherein there are two sliding blocks (26), two sliding blocks (26) are respectively arranged at two sides of the push rod (3), there are two strip-shaped grooves, and two sliding blocks (26) are respectively positioned in the two strip-shaped grooves.

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