CN108581227A - The special pipe cutting machine of pipe - Google Patents

Abstract

The invention discloses a special pipe cutting machine for round pipes, which comprises a frame and a laser cutting head. One side of the frame is provided with a feeding mechanism for placing round pipes on the frame; Mechanism and unloading mechanism, wherein there are several supporting devices distributed at intervals between the pushing mechanism and the pressing mechanism; The push drive device that the clamping device moves on the push track; when the round tube is placed on the frame by the feeding mechanism, the support device moves the round tube up to the clamping device, and when the clamping device clamps the round tube, pushes The driving device drives the clamping device close to or away from the pressing mechanism, pushes the round tube forward and places it under the laser cutting head for cutting. All materials are fully automated to improve production efficiency and reduce labor intensity.

Description

Special pipe cutting machine for round pipe

technical field

The invention relates to the field of cutting equipment, more specifically, it relates to a special pipe cutting machine for round pipes.

Background technique

At present, with the continuous improvement of laser cutting technology, especially the rapid development of the pipe cutting industry, laser processing has brought convenience and benefits to the manufacturing industry, and the market demand for laser pipe cutting machines is also increasing. However, most of the laser tube cutting equipment used in actual production is manually fed, cut and unloaded, which requires manual intervention, and the labor intensity of workers is high, which reduces production efficiency.

Contents of the invention

In view of the deficiencies in the prior art, the object of the present invention is to provide a special pipe cutting machine for round pipes, which can realize automatic feeding of round pipes, improve production efficiency and reduce labor intensity.

To achieve the above object, the present invention provides the following technical solutions:

A special pipe cutting machine for round pipes, including a frame and a laser cutting head, one side of the frame is provided with a feeding mechanism for placing round pipes on the frame; a pushing mechanism, a pressing mechanism and a The unloading mechanism, wherein several supporting devices distributed at intervals are arranged between the pushing mechanism and the pressing mechanism; the pushing mechanism includes a pushing track arranged on the frame, a clamping device for clamping the round pipe, and a driving clip The push drive device that the clamping device moves on the push track; when the round tube is placed on the frame by the feeding mechanism, the support device moves the round tube up to the clamping device, and when the clamping device clamps the round tube , the push driving device drives the clamping device close to or away from the pressing mechanism, pushes the round tube forward and places it under the laser cutting head for cutting, and the cut round tube is stored by the unloading mechanism.

The present invention further provides that: the feeding mechanism includes two feeding racks arranged at intervals, each feeding rack is provided with a feeding guide rod for placing round pipes, and one end of the feeding guide rod is inclined downward set, and the end is provided with a take-up device for taking the round tube from the feeding guide rod;

The retrieving device includes a retrieving seat, a retrieving track, and a first retrieving driver that drives the reclaiming seat to move back and forth along the retrieving track. The reclaiming seat is hinged with a retrieving arm and drives the retrieving arm to rotate around the hinge The second reclaim drive;

When it is necessary to take the round pipe, the second retrieving driver drives the retrieving arm to rotate toward the direction of the feeding guide rod and places it under the round pipe, and then drives the retrieving seat toward the direction of the feeding guide rod through the first reclaiming driver. Move a certain distance on the retrieving track so that the retrieving arm is placed directly below the round pipe, and at this moment, the second retrieving driver drives the retrieving arm to rotate in the opposite direction to take the round pipe.

The present invention further provides that: the fetching arm is provided with a fetching part and a material guiding part, and the fetching part and the material guiding part are arranged at a certain angle. The material arm rotates towards the direction of the feeding guide rod, so that the reclaiming part is placed under the round tube, and then the reclaiming seat is driven to move a certain distance along the retrieving track in the direction of the guide rod through the first reclaiming driver, so that the reclaiming part is placed Directly below the round tube, at this moment, the second pick-up driver drives the pick-up part to rotate in the opposite direction to pick up the round tube, and the round tube slides along the guide part onto the supporting device of the frame.

The present invention further provides that: the material guide part is hinged to the limit part, and the limit part is provided with an L-shaped positioning part. When the circular tube slides onto the limit part along the material guide part, the positioning part will The tube blocks the sliding, so that it is fixed above the desired position. When the second feeding driver drives the feeding arm to rotate toward the guide rod to take material again, the limiting part will rotate around the guiding part, so that the limiting part will Pull out from under the round tube.

The present invention further provides that: the clamping device includes a clamping seat arranged on the push track, and the clamping seat is provided with a clamping head for clamping the round pipe, and a first clamping drive for driving the clamping head to rotate. device and drives the clamping head to move up and down the second clamping driving device;

The first clamping drive device includes a first clamping motor and a first clamping bull gear connected to the clamping head, and the output shaft of the first clamping motor is provided with a gear that meshes with the first clamping bull gear. The first clamping pinion.

The second clamping drive device includes a second clamping motor and a mounting plate for fixing the clamping head, the mounting plate is provided with a drive nut, and the output shaft of the second clamping motor is provided with a drive nut corresponding to the drive nut. Matched drive screw.

The present invention further provides that: the push drive device includes a push motor fixed on the clamping seat and a push rack arranged on the push track, the output shaft of the push motor is provided with a push rotation gear meshed with the push rack .

The present invention further provides that: the pressing mechanism includes a base with a pressing V-shaped groove, and a pressing support assembly is arranged on the opposite surfaces of the two groove walls of the pressing V-shaped groove, and the two grooves of the pressing V-shaped groove A compression assembly is arranged on the end surface of the wall, and the two compression assemblies correspond to the two compression support assemblies one by one, and the compression assembly is placed directly above the compression support assembly;

The pressing support assembly includes a roller seat and a pressing steel ball rotatably arranged on the roller seat, and the roller seat is inlaid on the groove wall of the pressing V-shaped groove;

The compression assembly includes a compression seat fixed on the upper end surface of the compression V-shaped groove wall, the compression seat is provided with a compression cylinder, and the output shaft of the compression cylinder is provided with a compression head;

When the round pipe is placed on the pressing V-shaped groove of the base, the pressing steel balls of the pressing support assembly are placed under the round pipe for support, and the pressing cylinder drives the pressing head to move down and press the circle The tube is fixed.

The present invention further provides: the blanking mechanism includes a blanking rack, a movable bracket device and several fixed bracket devices are arranged on the blanked rack, and a mobile bracket device and several fixed bracket devices are arranged side by side in sequence on the shelf;

The mobile support device includes a mobile frame with a supporting device, a moving track and a moving cylinder that drives the mobile frame to move on the moving track;

The fixed bracket device includes a fixed frame fixed on the blanking frame, and the fixed frame is also provided with a supporting device;

Both the upper ends of the movable frame and the fixed frame are inclined towards one side.

The present invention further provides: the supporting device includes a supporting base, on which a lifting cylinder is arranged, the output shaft of the lifting cylinder is provided with a supporting seat with a compressed V-shaped groove, and the supporting seat is moved up and down by the lifting cylinder. move;

Universal balls are arranged on the two groove walls of the pressed V-shaped groove, and the two universal balls are arranged oppositely. Press it against the groove wall of the V-shaped groove.

The present invention further provides: two guide assemblies are provided on the support base, the lifting cylinder is placed between the two guide assemblies, the guide assemblies include guide sleeves and guide posts that cooperate with each other, and the guide sleeves are fixed on the support On the base, one end of the guide column is connected with the support seat, and the other end is placed on the guide sleeve.

Beneficial effects of the present invention: when the round pipe is placed on the frame by the feeding mechanism, the support device moves the round pipe upward to the clamping device, and when the clamping device clamps the round pipe, the push drive device drives The clamping device is close to or away from the pressing mechanism, and the round tube is pushed forward and placed under the laser cutting head for cutting. The cut round tube is stored by the unloading mechanism, and the feeding, cutting and unloading of the round tube are all realized. Automation, improve production efficiency and reduce labor intensity.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of a special pipe cutting machine for round pipes of the present invention;

Fig. 2 is the structural representation of feeding mechanism;

Fig. 3 is the structural representation of reclaiming device;

Fig. 4 is the structural representation of pushing mechanism;

Fig. 5 is a structural schematic diagram 1 of the clamping device;

Fig. 6 is a structural schematic diagram II of the clamping device;

Fig. 7 is the structural representation of pressing mechanism;

Fig. 8 is the structural representation of unloading mechanism;

Fig. 9 is a schematic structural view of the mobile stand device;

Fig. 10 is a schematic structural view of the supporting device.

Explanation of reference signs: 1. Frame; 2. Laser cutting head; 3. Feeding mechanism; 31. Feeding frame; 32. Feeding guide rod; 33. Reclaiming device; Material track; 333, first reclaiming drive; 334, retrieving arm; 3341, retrieving part; 3342, guide part; 3343, limit part; 335, second retrieving drive; 4, push mechanism; 41, Push track; 42, clamping device; 421, clamping seat; 422, clamping head; 423, first clamping drive device; 424, second clamping drive device; 43, push drive device; 5, pressing mechanism 51, pressing the base; 511, pressing the V-shaped groove; 52, pressing the support assembly; 521, pressing the roller seat; 522, pressing the steel ball; 53, pressing the assembly; 531, pressing the seat; 532, Compression cylinder; 533, compression head; 6, blanking mechanism; 6, blanking mechanism; 61, blanking frame; 62, mobile support device; 621, mobile frame; 622, mobile track; 623, mobile cylinder; 63 , fixed bracket device; 631, fixed frame; 7, support device; 71, support base; 72, lifting cylinder; 73, support seat; 731, support V-shaped groove; 74, universal ball.

Detailed ways

The embodiment of a special pipe cutting machine for round pipes of the present invention will be further described in detail with reference to accompanying drawings 1 to 10 .

As can be seen from Fig. 1, a special pipe cutting machine for round pipes includes a frame 1 and a laser cutting head 2, and one side of the frame 1 is provided with a feeding mechanism 3 for placing round pipes to the frame 1; 1, a push mechanism 4, a pressing mechanism 5 and a blanking mechanism 6 are arranged in sequence, wherein a plurality of supporting devices 7 distributed at intervals are arranged between the pushing mechanism 4 and the pressing mechanism 5; The push track 41 on 1, the clamping device 42 for clamping the round tube and the push drive device 43 that drives the clamping device 42 to move on the push track 41; when the round tube is placed on the frame 1 by the feeding mechanism 3 , the supporting device 7 supports and moves the round tube upwards to the clamping device 42, and when the clamping device 42 clamps the round tube, the push drive device 43 drives the clamping device 42 to approach or move away from the pressing mechanism 5, and the The round tube is pushed forward and placed under the laser cutting head 2 for cutting. The cut round tube is stored by the unloading mechanism 6, and the loading, cutting, and unloading of the round tube are all automated to improve production efficiency and reduce labor intensity. .

As can be seen from Fig. 2 and Fig. 3, wherein the feeding mechanism 3 comprises two feeding racks 31 arranged at intervals, each feeding rack 31 is provided with a feeding guide rod 32 for placing a round pipe, and the feeding guide rod One end of 32 is inclined downwards, and the end is provided with a material retrieving device 33 from a circular tube on the feeding guide rod 32; Seat 331 moves back and forth along the first reclaiming driver 333 of material retrieving track 332, and described reclaiming seat 331 is hinged with reclaiming arm 334 and the second reclaiming driver 335 that drives reclaiming arm 334 to rotate around hinge; Wherein the The retrieving arm 334 is provided with a retrieving part 3341 and a material guide part 3342. The retrieving part 3341 and the material guide part 3342 are arranged at a certain angle. The arm 334 rotates toward the direction of the feeding guide rod 32, so that the retrieving part 3341 is placed under the circular tube, and then the first retrieving driver 333 drives the retrieving seat 331 to move along the retrieving track 332 toward the direction of the feeding guide rod 32 A certain distance, so that the pick-up part 3341 is placed directly below the round tube, at this time, the second pick-up driver 335 drives the pick-up part 3341 to rotate in the opposite direction to take the round tube, and the round tube slides along the material guide part 3342 onto the support device 7 of the frame 1.

In order to prevent the round tube from directly sliding to the desired position and causing noise, the limiting part 3343 is hinged on the guide part 3342, and the limiting part 3343 is provided with an L-shaped positioning part. When the round tube moves along the guide part 3342 When sliding to the limit part 3343, the positioning part will block the sliding of the round tube, so that it is fixed above the desired position, effectively avoiding the collision of the round tube and generating noise. When the second feeding driver 335 drives the feeding When the arm 334 rotates toward the direction of the guide bar to take out material again, the stopper 3343 will rotate around the guide part 3342, so that the stopper 3343 is drawn out from the bottom of the round tube, which has a simple structure and is easy to operate.

As can be seen from Fig. 4 to Fig. 6, wherein the clamping device 42 includes a clamping seat 421 arranged on the pushing track 41, and the clamping seat 421 is provided with a clamping head 422 for clamping a round pipe, a driving clamp The first clamping driving device 423 for rotating the clamping head 422 and the second clamping driving device 424 for driving the clamping head 422 to move up and down;

The first clamping drive device 423 includes a first clamping motor and a first clamping bull gear connected to the clamping head 422, the output shaft of the first clamping motor is provided with the first clamping bull gear When the first clamping pinion gear is meshed with each other, when the first clamping motor drives the first clamping gear to rotate through the first clamping pinion, the first clamping gear will drive the clamping head 422 to rotate.

The second clamping drive device 424 includes a second clamping motor and a mounting plate for fixing the clamping head 422, the mounting plate is provided with a drive nut, and the output shaft of the second clamping motor is provided with a transmission When the second clamping motor drives the drive screw to rotate, the mounting plate moves up and down through the drive nut and the drive screw, thereby driving the clamping head 422 to move up and down.

When the round tube is placed on the support device 7 on the frame 1 through the feeding mechanism 3, according to the position of the round tube, when the second clamping motor drives the drive screw to rotate, the mounting plate cooperates with the drive screw through the drive nut Moving up and down, thereby driving the clamping head 422 to move up and down to align with the round pipe and perform clamping.

As can be seen from Fig. 7, wherein the pressing mechanism 5 includes a pressing base 51 with a pressing V-shaped groove 511, and a pressing supporting assembly 52 is arranged on the opposite sides of the two groove walls of the pressing V-shaped groove 511, and when pressing The upper end surfaces of the two groove walls of the V-shaped groove 511 are provided with a compression assembly 53, and the two compression assemblies 53 correspond to the two compression support assemblies 52 one by one, and the compression assembly 53 is placed directly above the compression support assembly 52; The compression support assembly 52 includes a compression roller seat 521 and a compression steel ball 522 that is rotatably arranged on the roller seat, and the compression roller seat 521 is embedded on the groove wall of the compression V-shaped groove 511; The compression assembly 53 includes a compression seat 531 fixed on the upper end surface of the compression V-shaped groove 511, the compression seat 531 is provided with a compression cylinder 532, and the output shaft of the compression cylinder 532 is provided with a compression head 533 ; The compression head 533 includes a compression head body and a compression steel ball that is rotatably arranged on the compression head body.

When the round pipe is placed on the pressing V-shaped groove 511 of the pressing base 51, the pressing steel ball 522 of the pressing support assembly 52 is placed under the round pipe for support, and the pressing cylinder 532 drives the pressing The head 533 moves downward to press the round pipe to fix it. At this time, the laser cutting head 2 cuts the round pipe, which can avoid the shaking of the round pipe during cutting and improve the cutting accuracy.

As can be seen from Fig. 8 and Fig. 9, wherein said unloading mechanism 6 comprises unloading rack 61, and said unloading rack 61 is provided with a mobile support device 62 and several fixed support devices 63, a mobile support device 62 and several Two fixed support devices 63 are arranged side by side on the blanking rack 61 in turn; the mobile support device 62 includes a mobile frame 621 with a support device 7, a moving track 622 and a moving cylinder 623 that drives the mobile frame 621 to move on the moving track 622 , the fixed bracket device 63 includes a fixed frame 631 fixed on the blanking frame 61, and the fixed frame 631 is also provided with a support device 7; the upper ends of the movable frame 621 and the fixed frame 631 are all inclined to one side, The length can be cut according to the needs of the round tube, so that one end of the round tube moves forward through the laser cutting head 2 and placed on the moving frame 621 or the fixed frame 631;

At this time, the support device 7 moves upwards to support and fix the round pipe. The laser cutting head 2 cuts the round pipe. After the cutting is completed, the cut round pipe automatically rolls down along the moving frame 621 and the fixed frame 631 for storage. Realize automatic cutting of round tubes, improve production efficiency and reduce labor intensity.

As can be seen from Fig. 10, the support device 7 includes a support base 71, on which a lift cylinder 72 is arranged, and the output shaft of the lift cylinder 72 is provided with a support base 73 with a supporting V-shaped groove 731, the support The seat 73 moves up and down by the lifting cylinder 72, and the two groove walls supporting the V-shaped groove 731 are provided with universal balls 74, and the two universal balls 74 are relatively arranged, and the universal balls 74 include a roller seat and a rotating device The steel ball on the roller seat is embedded on the groove wall of the supporting V-shaped groove 731 .

Wherein the support seat 73 is arranged on the lifting cylinder 72, can realize the height adjustment of the support seat 73, and can adjust the diameter of the circular tube, which is very convenient, and the two groove walls supporting the V-shaped groove 731 are all provided with universal balls 74, and The two universal balls 74 are arranged opposite to each other, so that the two universal balls 74 are arranged at a certain angle, which can reduce the friction damage to the processed round pipe, and at the same time can locate the center of the processed round pipe to prevent deflection and downward bending. The universal ball 74 includes a roller seat and a steel ball rotatably arranged on the roller seat. The roller seat is inlaid on the groove wall supporting the V-shaped groove 731, so that the round pipe moves back and forth relative to the support seat 73 or rotates to drive the steel ball to move forward and backward. The roller seat rotates, using the principle of rolling friction to replace the sliding friction of the round tube in the prior art, and also greatly reduces the friction damage to the processed round tube.

Two guide assemblies are provided on the support base 71, and the lifting cylinder 72 is placed between the two guide assemblies. The guide assemblies include guide sleeves and guide posts that cooperate with each other. Above, one end of the guide column is connected with the support seat 73, and the other end is placed on the guide sleeve. The guide assembly plays a guiding role in the process of the lifting cylinder 72 driving the support seat 73 to move up and down, and the support seat 73 moves up and down more smoothly. Stable and reliable.

A mounting plate is arranged below the support base 73, and the bolts pass through the support base 73 to connect with the mounting plate, the mounting plate is provided with a slot, and the support base 73 is provided with a protrusion matching the slot, When the supporting seat 73 needs to be replaced, it can be replaced only by loosening the bolts, and the supporting seat 73 can be quickly positioned through the cooperation of the protrusion and the draw-in groove, which is convenient for installation.

The above descriptions are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention should also be regarded as the protection scope of the present invention.

Claims (10)

1. A special pipe cutting machine for round pipes, characterized in that: it includes a frame and a laser cutting head, and one side of the frame is provided with a feeding mechanism for placing round pipes to the frame; A pushing mechanism, a pressing mechanism, and a feeding mechanism are sequentially arranged on the frame, wherein a plurality of support devices distributed at intervals are arranged between the pushing mechanism and the pressing mechanism; The pushing mechanism includes a pushing track arranged on the frame, a clamping device for clamping the round pipe, and a pushing drive device for driving the clamping device to move on the pushing track; When the round pipe is placed on the frame by the feeding mechanism, the support device moves the round pipe upwards to the clamping device, and when the clamping device clamps the round pipe, the push drive device drives the clamping device close to or Away from the pressing mechanism, the round tube is pushed forward and placed under the laser cutting head for cutting, and the cut round tube is stored by the unloading mechanism. 2. The special pipe cutting machine for round pipes according to claim 1, characterized in that: the feeding mechanism includes two feeding racks arranged at intervals, and each feeding rack is provided for placing the feeding material of the round pipe A guide rod, one end of the feeding guide rod is inclined downward, and the end is provided with a reclaiming device for taking the round tube from the feeding guide rod; The retrieving device includes a retrieving seat, a retrieving track, and a first retrieving driver that drives the reclaiming seat to move back and forth along the retrieving track. The reclaiming seat is hinged with a retrieving arm and drives the retrieving arm to rotate around the hinge The second reclaim drive; When it is necessary to take the round pipe, the second retrieving driver drives the retrieving arm to rotate toward the direction of the feeding guide rod and places it under the round pipe, and then drives the retrieving seat toward the direction of the feeding guide rod through the first reclaiming driver. Move a certain distance on the retrieving track so that the retrieving arm is placed directly below the round pipe, and at this moment, the second retrieving driver drives the retrieving arm to rotate in the opposite direction to take the round pipe. 3. The special pipe cutting machine for round pipes according to claim 2, characterized in that: the reclaiming arm is provided with a retrieving part and a material guiding part, and the retrieving part and the material guiding part are arranged at a certain angle, and it is necessary to When taking the round pipe, the second reclaiming driver drives the reclaiming arm to rotate toward the direction of the feeding guide rod, so that the reclaiming part is placed under the round pipe, and then drives the reclaiming seat toward the guide rod through the first reclaiming driver The direction moves a certain distance along the retrieving track, so that the retrieving part is placed directly below the round tube. At this time, the second retrieving driver drives the retrieving part to rotate in the opposite direction to take the round tube, and the round tube moves along the guide The material section slides onto the supporting device of the frame. 4. The special pipe cutting machine for round pipes according to claim 3, characterized in that: the guide part is hinged with a limit part, and the limit part is provided with an L-shaped positioning part. When sliding to the limit part, the positioning part blocks the sliding of the round tube to fix it above the desired position. When the second reclaiming driver drives the reclaiming arm to rotate in the direction of the guide rod to refeed, The limiting part will rotate around the material guide part, so that the limiting part is drawn out from the bottom of the round tube. 5. The special pipe cutting machine for round pipes according to claim 1, characterized in that: the clamping device includes a clamping seat arranged on the push track, and the clamping seat is provided with a clamp for clamping the round pipe. a clamping head, a first clamping driving device for driving the clamping head to rotate, and a second clamping driving device for driving the clamping head to move up and down; The first clamping drive device includes a first clamping motor and a first clamping bull gear connected to the clamping head, and the output shaft of the first clamping motor is provided with a gear that meshes with the first clamping bull gear. The first clamping pinion. The second clamping drive device includes a second clamping motor and a mounting plate for fixing the clamping head, the mounting plate is provided with a drive nut, and the output shaft of the second clamping motor is provided with a drive nut corresponding to the drive nut. Matched drive screw. 6. The special pipe cutting machine for round pipes according to claim 5, characterized in that: the push drive device includes a push motor fixed on the clamping seat and a push rack arranged on the push track, and the push motor The output shaft of the output shaft is provided with the push rotation gear meshed with the push rack. 7. The special pipe cutting machine for round pipes according to claim 1, characterized in that: the pressing mechanism includes a base with a pressing V-shaped groove, and is provided on the opposite sides of the two groove walls of the pressing V-shaped groove. There is a compression support assembly, and the compression assembly is arranged on the upper end faces of the two groove walls of the compression V-shaped groove, and the two compression assemblies correspond to the two compression support assemblies one by one, and the compression assembly is placed in the compression support assembly Directly above; The pressing support assembly includes a roller seat and a pressing steel ball rotatably arranged on the roller seat, and the roller seat is inlaid on the groove wall of the pressing V-shaped groove; The compression assembly includes a compression seat fixed on the upper end surface of the compression V-shaped groove wall, the compression seat is provided with a compression cylinder, and the output shaft of the compression cylinder is provided with a compression head; When the round pipe is placed on the pressing V-shaped groove of the base, the pressing steel balls of the pressing support assembly are placed under the round pipe for support, and the pressing cylinder drives the pressing head to move down and press the circle The tube is fixed. 8. The special-purpose pipe cutting machine for round pipes according to claim 1, characterized in that: the blanking mechanism includes a blanking frame, and the blanking frame is provided with a mobile bracket device and several fixed bracket devices, A mobile support device and several fixed support devices are arranged side by side on the unloading rack in sequence; The mobile support device includes a mobile frame with a supporting device, a moving track and a moving cylinder that drives the mobile frame to move on the moving track; The fixed bracket device includes a fixed frame fixed on the blanking frame, and the fixed frame is also provided with a supporting device; Both the upper ends of the movable frame and the fixed frame are inclined towards one side. 9. The special pipe cutting machine for round pipes according to claim 1, characterized in that: the supporting device includes a supporting base, a lifting cylinder is arranged on the supporting base, and the output shaft of the lifting cylinder is provided with a pressing The supporting seat of the V-shaped groove, the supporting seat moves up and down through the lifting cylinder; Universal balls are arranged on the two groove walls of the pressed V-shaped groove, and the two universal balls are arranged oppositely. Press it against the groove wall of the V-groove. 10. The special pipe cutting machine for round pipes according to claim 9, characterized in that: two guide assemblies are provided on the support base, the guide assemblies are placed between the two guide assemblies, and the lifting cylinder includes mutual A matched guide sleeve and a guide post, the guide sleeve is fixed on the support base, one end of the guide post is connected to the support base, and the other end is placed on the guide sleeve.