CN111922534B

CN111922534B - Combined pipe cutting machine

Info

Publication number: CN111922534B
Application number: CN202011081451.4A
Authority: CN
Inventors: 周卫国; 张启玲; 张建峰; 杨柱伦
Original assignee: Guangdong Power Grid Co Ltd; Dongguan Power Supply Bureau of Guangdong Power Grid Co Ltd
Current assignee: Guangdong Power Grid Co Ltd; Dongguan Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority date: 2020-10-12
Filing date: 2020-10-12
Publication date: 2021-01-08
Anticipated expiration: 2040-10-12
Also published as: CN111922534A

Abstract

The invention relates to the technical field of pipe cutting machines, and discloses a combined pipe cutting machine which comprises a laser cutting machine and a track lathe bed, wherein a plurality of folding pipe brackets for supporting pipes and keeping the pipes in a horizontal state are arranged on the track lathe bed; through setting up two sets of jack catchs among them with chuck mechanism into flexible jack catch for after tubular product was cut out the arc incision, the part of being cut still can be by two sets of flexible jack catchs centre gripping, has reduced the probability that tubular product slope and laser generator collided.

Description

Combined pipe cutting machine

Technical Field

The invention relates to the technical field of pipe cutting machines, in particular to a combined pipe cutting machine.

Background

The pipe cutting machine is a machine for cutting pipes, is used for the pipe processing field on a large scale, and the existing laser pipe cutting machine cuts the pipe close to through a laser generator, and needs the pipe to rotate by itself and stretch out and draw back so as to cut out corresponding shape in the cutting process, so the laser pipe cutting machine needs to cooperate in the application process: the pipe clamping device is used by external mechanisms such as a rail machine tool for stretching pipes, a folding pipe bracket for supporting the pipes, a pipe clamping device for controlling the pipes to rotate, a pipe limiting mechanism for keeping the processing stability of the pipes and the like;

however, the interaction of the external mechanism of the existing laser pipe cutting machine to the pipe still has the following problems in the using process:

(1) the roller clamping jaws used for clamping the pipes on the common pipe limiting mechanism are all of rigid structures, the pipes are limited to move by the roller clamping jaws in four directions, so that the aim of stabilizing the pipes is fulfilled, when notches are cut on the pipes and the notches shrink to the roller clamping jaws, the rigid roller clamping jaws are difficult to limit the notches of the pipes, and the pipes can be inclined and collide with a laser generator;

(2) because folding tubular product bracket is generally close to automatic folding along with tubular product clamping device, folding tubular product bracket is generally to launching again and hold up tubular product when tubular product clamping device is returning to suitable position back, along with folding tubular product bracket launch make the bracket structure on its top can exert excessive thrust to tubular product to can lead to tubular product to take place to vibrate at the in-process of processing, and then reduced the processingquality of tubular product.

Disclosure of Invention

The invention aims to provide a combined pipe cutting machine, which solves the problems that a rigid roller jaw in the prior art is difficult to limit a notch of a pipe, and excessive thrust can be applied to the pipe along with the expansion of a folding pipe bracket.

In order to solve the technical problems, the invention specifically provides the following technical scheme:

a combined pipe cutting machine comprises a laser cutting machine and a track lathe bed, wherein a plurality of folding pipe brackets for supporting pipes and keeping the pipes in a horizontal state are arranged on the track lathe bed, a pipe clamping device and a pipe limiting mechanism are arranged on the track lathe bed, and the pipe clamping device is used for controlling the pipes to move along a preset first horizontal direction or rotate around the axial direction of the pipes;

the pipe limiting mechanism comprises a rail mounting rack which is mounted on the rail bed body and can move along the first horizontal direction, a rotary chuck seat is rotatably mounted inside the rail mounting rack, and the rotary chuck seat is detachably and fixedly connected with the pipe;

still install chuck mechanism on the rotatory chuck seat, chuck mechanism's inside is equipped with two sets of butts at predetermined first vertical direction symmetry the flexible jack catch of the relative both sides of tubular product and be equipped with horizontal butt at predetermined second horizontal direction symmetry the rigid jack catch of tubular product.

Optionally, the flexible jack catch includes the jack catch slide, the front end of jack catch slide is equipped with the recess, the recess internal rotation is connected with the swing arm, the cover is equipped with on the swing arm and is used for the butt the solid cylinder of swing arm of tubular product.

Optionally, two sides of the solid roller of the rotary rod are respectively provided with an elastic force arm sleeved on the rotary rod, and two compensation rollers used for elastically abutting against the pipe are rotatably connected between the front ends of the elastic force arms far away from the rotary rod.

Optionally, a barrel seat mounting groove is formed in each of the groove walls of the grooves on the two sides of the rotating rod solid drum, and a limiting barrel seat is mounted in each barrel seat mounting groove; the limiting cylinder seat is fixedly connected with the elastic force arm;

the limiting barrel seat is internally provided with a force arm connecting barrel which is sleeved on the rotary rod, and one end of the inner part of the force arm connecting barrel is fixedly connected with a coil spring arranged on the rotary rod.

Optionally, both ends of the rotating rod extend out of the jaw sliding seat and are respectively provided with a knob for driving the rotating rod to rotate and a fixing buckle for fixing the rotating angle of the rotating rod.

Optionally, one side of the limiting cylinder seat facing the rotating rod solid roller is provided with a cylinder seat limiting clamping groove for limiting the rotation angle of the force arm connecting cylinder, the force arm connecting cylinder is provided with a limiting protrusion matched with the cylinder seat limiting clamping groove, and the maximum rotation angle of the force arm connecting cylinder is 10-15 degrees.

Optionally, the folding pipe bracket comprises a folding frame device mounted on the rail bed, a pipe elastic bracket for flexibly supporting the pipe is mounted at the top end of the folding frame device, and a cylinder for controlling the folding frame device to fold or unfold is mounted inside the folding frame device;

the tubular product elastic bracket includes that whole is the twin drum bracket of U-shaped, and the both ends of twin drum bracket are rotated and are connected with and are used for holding up the silence cylinder of tubular product, the central authorities of twin drum bracket rotate and are connected with the rotation mount pad, it installs to rotate the mount pad the top of folding leg device, and rotate the mount pad with the torsional spring is installed to the junction of twin drum bracket.

Optionally, a limiting groove for limiting a rotation angle of the double-drum bracket is arranged at a joint of the double-drum bracket and the rotation mounting seat, and the maximum rotation angle of the double-drum bracket is 40-45 °.

Optionally, a rubber buffer layer is arranged outside the silent drum.

Compared with the prior art, the invention has the following beneficial effects:

(1) according to the invention, two groups of claws in the chuck mechanism are flexible claws, so that after the pipe is cut into an arc-shaped cut, the cut part can still be clamped by the two groups of flexible claws, and the probability of collision of the pipe inclination and the laser generator is reduced;

(2) according to the invention, the folding pipe bracket for supporting the middle section of the pipe is arranged into the elastic compensation type supporting structure with the double rollers, and the pipe is flexibly supported by matching the unfolding angle of the folding pipe bracket, so that if the pipe is subjected to excessive upward thrust in the process, the excessive thrust can be converted into the torque force of the rotation of the double-roller bracket, and the influence on the cutting of the pipe is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 provides an overall schematic connection diagram for an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a flexible jaw provided in the embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a rigid jaw provided in an embodiment of the present invention.

Fig. 4 is a partial cross-sectional view of an embodiment of the invention providing a resilient arm.

Fig. 5 is a schematic structural diagram of a pipe elastic bracket according to an embodiment of the present invention.

The reference numerals in the drawings denote the following, respectively:

1-a rail bed; 2-folding the tubing carrier; 3-a tube holding device; 4-a pipe limiting mechanism; 5-a pipe material;

21-folding leg means; 22-a tube elastic bracket;

221-double drum carriage; 222-a silent drum; 223-rotating the mounting seat; 224-torsion spring;

41-a rail mounting; 42-rotating chuck base; 43-a chuck mechanism; 44-flexible jaws; 45-rigid jaws;

441-jaw slide; 442-a rotating rod; 443-rotating rod solid drum; 444-elastic arm of force; 445-a compensating roller;

4421-a knob; 4422-fixing buckle; 4441-limiting cylinder seat; 4442-arm connecting cylinder; 4443-coil spring; 4444-limiting clamping groove of cylinder seat.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

As shown in fig. 1 to 5, the present invention provides a combined pipe cutting machine, which includes a laser cutting machine and a track bed 1, wherein the track bed 1 is provided with a plurality of folding pipe brackets 2 for supporting a pipe 5 and keeping the pipe 5 in a horizontal state, the track bed 1 is provided with a pipe clamping device 3 and a pipe limiting mechanism 4, and the pipe clamping device 3 is used for controlling the pipe 5 to move along a predetermined first horizontal direction or rotate around the axial direction of the pipe 5; wherein the first horizontal direction is the lateral direction in fig. 1.

The folding pipe bracket 2 is automatically folded along with the approach of the pipe clamping device 3 and is used for the pipe clamping device 3 to pass through, the folding pipe bracket 2 is automatically unfolded to the original height along with the one-way distance of the pipe clamping device 3 and supports the pipe 5, and the folding pipe bracket 2 prevents the pipe 5 from being excessively stressed by the support force through elastic compensation type support during unfolding;

the pipe limiting mechanism 4 comprises a rail mounting rack 41 which is arranged on the rail bed body 1 and can move along a first horizontal direction, a rotary chuck seat 42 is rotatably arranged in the rail mounting rack 41, and the rotary chuck seat 42 is detachably and fixedly connected with the pipe 5;

the rotary chuck base 42 is also provided with a chuck mechanism 43, two groups of flexible clamping jaws 44 which are abutted to two opposite sides of the pipe 5 are symmetrically arranged in the chuck mechanism 43 in a preset first vertical direction, and rigid clamping jaws 45 which are transversely abutted to the pipe 5 are symmetrically arranged in a preset second horizontal direction; wherein, the second horizontal direction is the direction perpendicular with first horizontal direction, and second horizontal direction and first horizontal direction all are parallel with the bottom surface of track lathe bed 1.

The arc-shaped notch processed on the end surface of the pipe 5 is compensated and clamped by matching two groups of flexible clamping claws 44.

Two groups of claws in the chuck mechanism are set as flexible claws 44, so that after the pipe 5 is cut into an arc-shaped cut, the cut part can still be compensated and clamped by the two groups of flexible claws 44, and the probability of collision between the inclination of the pipe 5 and a laser generator is reduced;

through the folding tubular product bracket 2 that will hold up the tubular product middle section set up to the elastic compensation formula bearing structure of twin drum, tubular product 5 is lifted to the angle flexibility that the folding tubular product bracket 2 of cooperation expanded, at this in-process, if tubular product 5 receives too big last thrust, then can change unnecessary thrust into twin drum bracket 221 pivoted torsion, reduced the influence to cutting tubular product 5.

The flexible claw 44 comprises a claw slide 441, the front end of the claw slide 441 is provided with a groove, a rotating rod 442 is rotationally connected in the groove, and a rotating rod solid roller 443 for abutting against the pipe 5 is sleeved on the rotating rod 442.

The two sides of the rotating rod solid roller 443 are respectively provided with an elastic force arm 444 sleeved on the rotating rod 442, and a compensation roller 445 for elastically abutting against the pipe 5 is rotatably connected between the front ends of the two elastic force arms 444 far away from the rotating rod 442.

A barrel seat mounting groove is respectively formed in the groove walls of the grooves on the two sides of the rotary rod solid roller 443, and a limiting barrel seat 4441 is mounted in the barrel seat mounting groove; the limiting cylinder seat 4441 is fixedly connected with the elastic force arm 444;

the limiting cylinder seat 4441 is internally provided with a force arm connecting cylinder 4442 which is sleeved on the rotary rod 442, and the force arm connecting cylinder 4442 is internally and fixedly connected with a coil spring 4443 of which one end is arranged on the rotary rod 442.

Both ends of the rotary rod 442 extend out of the jaw slide 441 and are respectively provided with a knob 4421 for driving the rotary rod 442 to rotate and a fixing buckle 4422 for fixing the rotation angle of the rotary rod 442.

One side of the limiting cylinder seat 4441 facing the rotary rod solid cylinder 443 is provided with a cylinder seat limiting clamping groove 4444 for limiting the rotation angle of the force arm connecting cylinder 4442, the force arm connecting cylinder 4442 is provided with a limiting bulge matched with the cylinder seat limiting clamping groove 4444, and the maximum rotation angle of the force arm connecting cylinder 4442 is 10-15 degrees.

The folding pipe bracket 2 comprises a folding rack device 21 arranged on the track bed body 1, a pipe elastic bracket 22 for flexibly supporting the pipe 5 is arranged at the top end of the folding rack device 21, and a cylinder for controlling the folding or unfolding of the folding rack device 21 is arranged in the folding rack device 21;

the tube elastic bracket 22 includes a double-drum bracket 221 having a U-shape as a whole, and both ends of the double-drum bracket 221 are rotatably connected with a mute drum 222 for supporting the tube 5, a rotation mounting seat 223 is rotatably connected to the center of the double-drum bracket 221, the rotation mounting seat 223 is installed at the top end of the folding leg device 21, and a torsion spring 224 is installed at the connection of the rotation mounting seat 223 and the double-drum bracket 221.

The joint of the double-roller bracket 221 and the rotary mounting seat 223 is provided with a limiting groove for limiting the rotation angle of the double-roller bracket 221, and the maximum rotation angle of the double-roller bracket 221 is 40-45 degrees.

The outer side of the silent cylinder 222 is of an inwardly concave structure, and the outer layer of the silent cylinder 222 is provided with a rubber buffer layer.

The general folding starting mode of the folding pipe bracket 2 is a sensor installed on the track bed 1, after the pipe 5 is cut, the pipe clamping device 3 is controlled to continuously move towards the laser cutting machine, after the pipe clamping device 3 approaches and then the group of folding pipe brackets 2 is controlled, the group of folding pipe brackets 2 starts to be folded without obstructing the movement of the pipe clamping device 3, and after the pipe clamping device 3 moves backwards to a proper position, the group of folding pipe brackets 2 is controlled to start to be unfolded again and support the pipe 5.

During the use, need to place the tubular product 5 of waiting to cut on a plurality of folding tubular product brackets 2 earlier, make tubular product to push down the tubular product elasticity bracket 22 of slope 40-45 to the horizontality, two sets of silence cylinders 222 hold up tubular product this moment, make tubular product keep the state of relative level, and use tubular product clamping device 3 centre gripping tubular product 5's one end, make tubular product clamping device 3 can drive tubular product 5 rotatory, and move along track lathe bed 1 through control tubular product clamping device 3 and drive tubular product 5 and remove, tubular product removes in laser cutting machine, the notch of required shape can be cut out to rotatory cooperation laser generator.

In the process of re-expanding the folding pipe bracket 2 to support the pipe 5, the cylinder extends out to drive the folding pipe bracket 2 to expand, the pipe elastic bracket 22 arranged at the top end of the folding pipe bracket is driven to be in contact with the pipe 5, at the moment, the single mute roller 222 at one end of the double-roller bracket 221 is abutted against the pipe 5, because the pipe 5 is clamped by the pipe clamping device 3 and the chuck mechanism 43, the pipe cannot move when being pushed upwards by the mute roller 222, the mute roller 222 is driven to increase the force of extruding the pipe 5 along with the continuous expansion of the folding pipe bracket 2, the double-roller bracket 221 is driven to rotate along the connecting shaft in the rotating mounting seat 223, the connecting torsion spring 224 is continuously twisted and compressed, the mute roller 222 at the other end of the double-roller bracket 221 is driven to move upwards along with the continuous rotation of the double-roller bracket 221 until the folding pipe bracket 2 is completely expanded, at the moment, the two groups, in the process of unfolding the folding pipe bracket 2, the pipe elastic bracket 22 always keeps proper upward thrust, so that the pipe 5 is not easy to be subjected to excessive thrust, the pipe 5 part in the laser cutting machine is probably caused to displace, and the processing quality of the pipe 5 is guaranteed.

In the process that the pipe 5 passes through the pipe limiting mechanism 4 and extends to the laser cutting machine, the operation steps of the pipe limiting mechanism 4 are as follows:

step 100, controlling the chuck mechanism 43 to drive the two sets of flexible jaws 44 and the two sets of rigid jaws 45 to move relatively in a shape like a Chinese character 'jing', so that the pipe 5 is clamped at the central position.

In the process that the flexible claw 44 moves towards the tube 5, the compensation roller 445 inclined by 10 degrees to 15 degrees contacts with the tube 5, and along with the continuous movement of the flexible claw 44, the rotating rod solid roller 443 presses the tube 5 to drive the elastic force arm 444 to rotate outwards along the rotating rod 442, at this time, the two coil springs 4443 on the rotating rod 442 accumulate elastic potential energy until the rotating rod solid roller 443 connected on the rotating rod 442 abuts against the tube 5, in addition, the rotating rod 442 is driven to rotate by screwing the knob 4421, the potential energy of the twisting of the two coil springs 4443 on the rotating rod 442 is enhanced or reduced, so that the force of the compensation roller 445 abutting against the tube 5 is adjusted, and the rotating angle of the rotating rod 442 is fixed by screwing the fixing buckle 4422.

Step 200, controlling the rotating chuck base 42 and the clamping device on the pipe clamping device 3 to rotate synchronously, and driving the two positions of the pipe 5 to rotate synchronously, so that the pipe 5 can rotate, stretch and cooperate with the laser generator in the laser cutting machine to cut the outer end face of the pipe 5 in an appointed shape.

Because laser generator cuts tubular product 5's in-process, need keep less distance with tubular product 5, consequently need install at the tubular product 5 that is close to the centre gripping near laser generator's position, and do not influence the rotatory position of tubular product 5, when being cut out curved breach on tubular product 5, if tubular product 5 continuously rotates, flexible, remove the solid cylinder 443 department back of the swing arm of flexible jack catch 44 front end at the breach, two solid cylinders 443 of swing arm can't cooperate centre gripping tubular product 5, two elastic force arm 444 drive the arc breach department that compensation cylinder 445 elasticity butt tubular product under the effect of coil spring 4443 this moment, join in marriage a set of centre gripping tubular product through two compensation cylinders 445, prevent that tubular product 5 front end from rocking and then reducing the effect of cutting because of the centre gripping unstability results in.

In addition, in the process that the two compensating rollers 445 are matched to clamp the pipe 5, the pipe 5 is extruded along the arc-shaped notch on the pipe 5 all the time under the action of the elastic force arm 444 in the rotating and stretching processes of the two compensating rollers 445, the situation that the cut part of the pipe 5 is inclined due to the fact that the roller clamping mechanism cannot abut against the notch of the pipe 5 is not prone to occurring, and the probability of collision between the pipe 5 and a laser generator is reduced.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a combination pipe cutting machine, includes laser cutting machine and track lathe bed (1), its characterized in that: the pipe clamping device comprises a rail lathe bed (1), wherein a plurality of folding pipe brackets (2) used for supporting pipes (5) and keeping the pipes (5) in a horizontal state are arranged on the rail lathe bed (1), a pipe clamping device (3) and a pipe limiting mechanism (4) are arranged on the rail lathe bed (1), and the pipe clamping device (3) is used for controlling the pipes (5) to move along a preset first horizontal direction or rotate around the axial direction of the pipes (5);

the pipe limiting mechanism (4) comprises a track mounting rack (41) which is mounted on the track bed body (1) and can move along the first horizontal direction, a rotary chuck seat (42) is rotatably mounted inside the track mounting rack (41), and the rotary chuck seat (42) is detachably and fixedly connected with the pipe (5);

still install chuck mechanism (43) on rotatory chuck seat (42), the inside of chuck mechanism (43) is equipped with two sets of butts at predetermined first vertical direction symmetry flexible jack catch (44) and the rigidity jack catch (45) that are equipped with horizontal butt at predetermined second horizontal direction symmetry of the relative both sides of tubular product (5).

2. The combination pipe cutter of claim 1, wherein: the flexible clamping jaw (44) comprises a clamping jaw sliding seat (441), a groove is formed in the front end of the clamping jaw sliding seat (441), a rotating rod (442) is connected to the groove in a rotating mode, and a rotating rod solid roller (443) used for abutting against the pipe (5) is sleeved on the rotating rod (442).

3. The combination pipe cutter of claim 2, wherein: and the two sides of the rotating rod solid roller (443) are respectively provided with an elastic force arm (444) sleeved on the rotating rod (442), and a compensation roller (445) used for elastically abutting against the pipe (5) is rotatably connected between the front ends of the two elastic force arms (444) far away from the rotating rod (442).

4. The combination pipe cutter of claim 3, wherein: a barrel seat mounting groove is respectively formed in the groove wall of the groove on each of the two sides of the rotating rod solid roller (443), and a limiting barrel seat (4441) is mounted in each barrel seat mounting groove; the limiting cylinder seat (4441) is fixedly connected with the elastic force arm (444);

the limiting cylinder seat (4441) is internally provided with a force arm connecting cylinder (4442) sleeved on the rotary rod (442), and one end of the force arm connecting cylinder (4442) is fixedly connected with a coil spring (4443) arranged on the rotary rod (442).

5. The combination pipe cutter of claim 4, wherein: two ends of the rotary rod (442) extend out of the claw sliding seat (441) and are respectively provided with a knob (4421) for driving the rotary rod (442) to rotate and a fixing buckle (4422) for fixing the rotating angle of the rotary rod (442).

6. The combination pipe cutter of claim 5, wherein: one side of the limiting cylinder seat (4441) facing the rotating rod solid roller (443) is provided with a cylinder seat limiting clamping groove (4444) used for limiting the rotating angle of the force arm connecting cylinder (4442), a limiting bulge matched with the cylinder seat limiting clamping groove (4444) is arranged on the force arm connecting cylinder (4442), and the maximum rotating angle of the force arm connecting cylinder (4442) is 10-15 degrees.

7. The combination pipe cutter of claim 1, wherein: the folding pipe bracket (2) comprises a folding rack device (21) arranged on the track bed body (1), a pipe elastic bracket (22) used for flexibly supporting the pipe (5) is arranged at the top end of the folding rack device (21), and a cylinder used for controlling the folding rack device (21) to fold or unfold is arranged in the folding rack device (21);

tubular product elasticity bracket (22) is including whole twin drum bracket (221) that is the U-shaped, and the both ends of twin drum bracket (221) are rotated and are connected with and are used for holding up silent roll (222) of tubular product (5), the central authorities of twin drum bracket (221) are rotated and are connected with rotation mount pad (223), install rotation mount pad (223) the top of folding leg device (21), and rotate mount pad (223) with torsional spring (224) are installed to the junction of twin drum bracket (221).

8. The combination pipe cutter of claim 7, wherein: the joint of the double-roller bracket (221) and the rotary mounting seat (223) is provided with a limiting groove for limiting the rotation angle of the double-roller bracket (221), and the maximum rotation angle of the double-roller bracket (221) is 40-45 degrees.

9. The combination pipe cutter of claim 7, wherein: and a rubber buffer layer is arranged outside the mute roller (222).