CN114178714A

CN114178714A - Pipe flat-end cutting machine

Info

Publication number: CN114178714A
Application number: CN202111602550.7A
Authority: CN
Inventors: 石传明; 吴红苗; 石霄飞
Original assignee: Zhejiang Chunyu Industrial Co ltd
Current assignee: Zhejiang Chunyu Industrial Co ltd
Priority date: 2021-12-24
Filing date: 2021-12-24
Publication date: 2022-03-15

Abstract

The invention relates to cutting equipment and discloses a pipe flat-end cutting machine which comprises a rack, a rotating main shaft, a transverse guide rail and a cutting mechanism, wherein the rotating main shaft is arranged on the rack and is provided with a bent pipe clamping mechanism; the invention can cut a flat section on the bent pipe by adopting a laser cutting mode, can rotate along with the rotating main shaft, and can realize the cutting position conversion between two ends of the bent pipe by the rotatable clamping base, so that the double-end processing can be realized by one-time clamping of the bent pipe, and the cutting efficiency of the bent pipe is improved.

Description

Pipe flat-end cutting machine

Technical Field

The invention relates to the field of cutting equipment, in particular to a pipe plain end cutting machine.

Background

In the industrial fields of petroleum, chemical industry, medical treatment, food, light industry, mechanical instruments and the like, fluid substances are often required to be conveyed, so that a pipeline system is required. The pipeline system mainly comprises steel pipes, iron-zinc alloy pipes, stainless steel pipes and the like, wherein the copper pipes are good in heat conduction performance and corrosion resistance, but high in manufacturing cost and low in strength, the iron-zinc alloy is easy to rust, and the stainless steel pipes are widely applied by virtue of high strength and good corrosion resistance.

In the process of laying the pipeline, corner zones needing to be turned exist, in this case, in order to realize the turning of the pipeline, elbow joints are adopted in a pipeline system, and the elbow joints are mainly manufactured by inserting a cylindrical core mould into a steel pipe and then bending the steel pipe through a pipe bending machine. The outer side of the bent pipe is pulled in the bending process, and the inner side of the bent pipe is pressed, so that the end face of the bent pipe is deformed after being bent and needs to be trimmed. And the trimming of the pipeline is mainly realized by cutting off the redundant part of the pipeline by a cutting machine or a flat machine.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: for most of cutting machines, the main principle of cutting is to contact a steel pipe through a rotating cutter to realize cutting of the steel pipe.

Disclosure of Invention

The invention provides a pipe plain end cutting machine, aiming at improving the trimming effect of a pipe.

The invention provides a pipe flat cutting machine, which adopts the following technical scheme:

the utility model provides a tubular product flat-end cutting machine, includes the frame, set up in the frame and have return bend fixture's rotating main shaft, install in the frame and be on a parallel with rotating main shaft's axial transverse guide, slide and install the cutting mechanism on transverse guide, the last laser cutting head that is provided with of cutting mechanism.

Through adopting above-mentioned technical scheme, add man-hour, place the work piece in the return bend fixture on the rotating spindle, it is fixed with the work piece by return bend fixture, cutting mechanism takes the laser cutting head to be close to towards the work piece and cuts the work piece afterwards, and at the in-process of cutting, the rotating spindle is rotatory, along with the rotation of rotating spindle, produce the ring form incision on the work piece and this breach is closed gradually, thereby realize cutting of work piece, owing to adopt laser cutting, consequently, the section of work piece can have higher roughness, also can not produce the burr, so this kind of cutting machine can realize the section flat mouthful when cutting to the tubular product, thereby higher operational benefits has.

Optionally, the cutting mechanism includes that the transverse sliding seat of sliding installation on transverse guide, rotate and install on transverse guide and the horizontal screw rod of screw thread wear to locate on transverse sliding seat, be fixed in on transverse guide and the horizontal motor of output shaft and the linkage of horizontal screw rod, go up and down and set up the year thing seat on transverse sliding seat, the laser cutting head is fixed in and carries on the thing seat, just be provided with between transverse sliding seat and the year thing seat and be used for ordering about the lifting unit who carries the thing seat and be elevating movement.

Through adopting above-mentioned technical scheme, horizontal slide can take the laser cutting head to do lateral shifting, and carry the thing seat and can take the laser cutting head to do longitudinal motion, two motion direction intercrossing's structure superposes the back each other, can let the laser cutting head do the motion of optional position on the longitudinal plane to make this kind of cutting machine can carry out the adaptability according to length, the thickness of waiting to process the part and adjust, with process the work piece better.

Optionally, a vertical guide rail is fixed on the horizontal sliding seat, the object carrying seat is slidably mounted on the vertical guide rail, the lifting assembly comprises a lifting motor fixed on the vertical guide rail, a lifting screw fixed on an output shaft of the lifting motor and perpendicular to the moving direction of the horizontal sliding seat, the lifting screw is located in the vertical guide rail, a threaded hole which is penetrated through from top to bottom is formed in the object carrying seat, and the lifting screw penetrates through the threaded hole in the object carrying seat and is in threaded connection with the object carrying seat.

Through adopting above-mentioned technical scheme, vertical guide rail is used for the guide to carry the thing seat and produces vertical motion, and elevator motor can drive through the lifting screw and carry the thing seat and remove at the in-process that starts to realize the altitude mixture control of laser cutting head.

Optionally, return bend fixture is including installing the centre gripping base on the rotating main shaft, sliding and installing on the centre gripping base and along the radial removal seat that slides of rotating main shaft, be fixed in the centre gripping base respectively and remove the double-layered pipe die on the seat, be located the centre gripping base and remove on the seat all seted up the double-layered pipe groove on the double-layered pipe die, two double-layered pipe groove between each other after the double-layered pipe die amalgamation closes to form and presss from both sides the lumen, and is provided with the drive assembly who is used for ordering about the motion of removal seat on the centre gripping base.

Through adopting above-mentioned technical scheme, add man-hour, earlier put into the double-layered pipe mould on the centre gripping base with the return bend, start drive assembly, order about through drive assembly and remove the seat down, two double-layered pipe mould intercombinations were carried the return bend this moment, owing to have the double-layered pipe groove can supply the return bend holding, so the fixed of return bend is more firm to be favorable to improving the precision after the return bend processing.

Optionally, a slide rail is installed on the clamping base, the moving base is installed on the slide rail, and the driving assembly comprises a driving cylinder, wherein the cylinder body is fixed on the clamping base, and the piston rod is fixed on the moving base.

Through adopting above-mentioned technical scheme, when the return bend is put into to needs, the piston rod that drives actuating cylinder extends, and the piston rod that drives actuating cylinder can promote to move the seat and keep away from the centre gripping base at the in-process of extension to make two double-layered pipe moulds separately. And after putting into the return bend, order about the piston rod that drives actuating cylinder and shorten, drive actuating cylinder this moment and will remove the seat and stimulate towards the centre gripping base, make two pipe clamping die fold to the realization is fixed to the centre gripping of return bend.

Optionally, install the slide rail on the centre gripping base, remove the seat and install on the slide rail, it is provided with the notch of stepping down to remove the position that the seat is used for linking to each other with the slide rail, drive assembly installs on the centre gripping base and is located the intraoral spiral piece of stepping down, offers on removing the seat and is located the drive tooth on the intraoral lateral wall of stepping down including rotating, be provided with the spiral strip on the lateral wall of spiral piece, spiral strip on the spiral piece forms screw-thread fit with the drive tooth that removes on the seat, just be provided with on the centre gripping base and be used for ordering about spiral piece pivoted rotating assembly and be used for restricting the spacing subassembly that the spiral piece removed.

Through adopting above-mentioned technical scheme, because the spiral strip on the spiral piece forms screw-thread fit with the drive tooth that removes on the seat, consequently when rotating assembly ordered about the spiral piece and rotated, the spiral piece can remove the seat through the screw drive and move along the slide rail motion, and through the corotation and the reversal of spiral piece, then can control and remove the seat and be close to or keep away from the centre gripping base to realize opening, closing of two double-layered pipe dies.

Optionally, the rotating assembly includes a rotating motor installed on the clamping base, a rotating worm fixed on an output shaft of the rotating motor, and a rotating worm wheel integrally fixed on the spiral block and coaxially rotating with the spiral block, and the rotating worm is meshed with the rotating worm wheel.

Through adopting above-mentioned technical scheme, when the rotating electrical machines started, can drive rotatory worm wheel through rotatory worm and rotate, and be reciprocal anchorage again between rotatory worm wheel and the spiral piece, consequently the spiral piece will drive the removal seat and produce the motion along the slide rail to the realization is to the control that presss from both sides the pipe die and open, close.

Optionally, the limiting assembly comprises at least two limiting stops fixed on the clamping base and located in the yielding groove, a centering rod fixed on the moving seat and located in the yielding groove, the limiting stops are distributed along the moving direction of the moving seat, the spiral block and the rotating worm wheel are located between the two limiting stops, the two limiting stops respectively conflict with the end faces of the spiral block and the rotating worm wheel, an axial groove is formed in each limiting stop, and the free end of the centering rod sequentially penetrates through the centers of the axial groove, the spiral block and the rotating worm wheel on the limiting stops.

Through adopting above-mentioned technical scheme, limit stop is located the axial direction of spiral piece, an axial motion for limiting spiral piece, and the centering shaft rod wears to locate the center of spiral piece and rotatory worm wheel, can restrict the radial motion of spiral piece, limit stop and centering shaft rod back of mutually supporting, make spiral piece and rotatory worm wheel only can carry out original place rotary motion, and remove the seat and then can only follow the slide rail and be linear motion, consequently the spiral piece can order about through self and the threaded connection relation between the removal seat at rotatory in-process and remove the seat and slide.

Optionally, a mounting support is fixed on the rotating spindle, the clamping base is rotatably mounted on the mounting support, the rotating axis of the clamping base is perpendicular to the rotating axis of the rotating spindle, and a corner mechanism for driving the clamping base to rotate is arranged between the mounting support and the clamping base.

Through adopting above-mentioned technical scheme, the rotation of rotating main shaft mainly realizes the rotation of return bend man-hour for the laser cutting head need not to realize the circular cutting to the return bend around tubular product rotation, and the rotation of centre gripping base then can make the both ends switching position of return bend, and the rotation of rotating main shaft is resupplied for can realize the circular cutting after the return bend switches the tip, thereby need not to clamp the return bend again, can realize the cutting at return bend both ends and maintain.

Optionally, the corner mechanism includes a corner block rotatably mounted on the mounting support, a rotating shaft of which is along the tangential direction of the clamping base, and a corner motor fixed on the mounting support and having an output shaft with external threads, worm gear teeth are formed on the outer side wall of the corner block, the output shaft of the corner motor is meshed with the worm gear teeth, a through hole is formed in the center of the corner block, internal threads are formed on the inner wall of the through hole, an arc-shaped groove is formed in the clamping base, the arc-shaped groove enables an arc-shaped block to be formed on the clamping base, the external threads are formed on the arc-shaped block, the arc-shaped block is arranged in the through hole in the center of the corner block in a penetrating manner, and the external threads on the arc-shaped block are matched with the internal threads on the corner block.

Through adopting above-mentioned technical scheme, because the corner piece forms screw-thread fit with the arc piece, and the corner piece rotates and installs on erection support, consequently the corner piece can guide the centre gripping base rotatory at the pivoted in-process, and the rotatory in-process of centre gripping base can carry out the position with the both ends of return bend and switch to make the return bend need not the cutting process that repeated clamping just can realize both ends.

In conclusion, a smooth section can be cut on the bent pipe by adopting a laser cutting mode, the bent pipe can rotate along with the rotating main shaft, and the clamping base capable of rotating automatically can realize cutting position conversion between two ends of the bent pipe, so that double-end machining can be realized by clamping the bent pipe at one time, and the cutting efficiency of the bent pipe is improved.

Drawings

FIG. 1 is a schematic view of the overall structure of embodiment 1 of the present invention;

fig. 2 is an exploded view of a cutting mechanism in embodiment 1 of the present invention;

FIG. 3 is a schematic view of the overall structure of embodiment 2 of the present invention;

fig. 4 is an exploded view of the elbow clamping mechanism and the cutting mechanism in embodiment 2 of the present invention;

FIG. 5 is a schematic view of the structure of a rotary unit in embodiment 2 of the present invention;

fig. 6 is a partially enlarged view at a in fig. 3.

Description of reference numerals:

1. a frame; 2. rotating the main shaft; 21. mounting a support; 3. a bent pipe clamping mechanism; 31. clamping the base; 311. an arc-shaped slot; 312. an arc-shaped block; 313. an external thread; 32. a movable seat; 321. a abdication notch; 33. clamping a pipe die; 331. a pipe clamping groove; 34. a slide rail; 35. a driving cylinder; 4. a cutting mechanism; 41. a transverse slide carriage; 411. a vertical guide rail; 42. a transverse screw; 43. a transverse motor; 44. a carrying seat; 45. a laser cutting head; 5. a transverse guide rail; 6. a lifting assembly; 61. a lifting motor; 62. a lifting screw; 7. a corner turning mechanism; 71. a corner block; 711. perforating holes; 712. worm gear teeth; 713. a collar; 72. a corner motor; 8. a vertical plate; 9. a drive assembly; 91. a screw block; 911. a helical strip; 92. a drive tooth; 10. a limiting component; 101. a limit stop block; 102. a centering shaft rod; 103. a shaft passing groove; 11. a rotating assembly; 111. a rotating electric machine; 112. rotating the worm; 113. rotating the worm gear.

Detailed Description

The invention is described in further detail below with reference to figures 1-6.

Example 1:

the embodiment of the application discloses pipe material flat mouth cutting machine, refer to fig. 1, including frame 1, rotating main shaft 2, transverse guide 5 and cutting mechanism 4, rotating main shaft 2 installs on the inside wall of frame 1, and the specific gear box or the motor of selecting of the drive mode of rotating main shaft 2.

Install return bend fixture 3 on rotating main shaft 2, return bend fixture 3 specifically includes clamping base 31, removes seat 32 and press from both sides pipe die 33, and clamping base 31 is fixed in on rotating main shaft 2, is fixed with length direction along the radial slide rail 34 of rotating main shaft 2 on the terminal surface of rotating main shaft 2, removes the seat 32 and slides and peg graft and install on slide rail 34, and then makes and to remove and can produce relative motion between seat 32 and the clamping base 31. In order to drive the movable base 32 to move, the driving assembly 9 is disposed on the clamping base 31, specifically, the driving assembly 9 includes a driving cylinder 35, a cylinder body of the driving cylinder 35 is fixed on the clamping base 31, and a piston rod of the driving cylinder 35 is fixed to the movable base 32, so that the movable base 32 can be driven to be close to or far from the clamping base 31 in the process of extending and retracting the driving cylinder 35.

The pipe clamping dies 33 are provided with two, the two pipe clamping dies 33 are respectively fixed on the surfaces of the clamping base 31 and the moving base 32 opposite to each other, the pipe clamping grooves 331 with arc-shaped bends are formed in the surfaces of the two pipe clamping dies 33 opposite to each other, the pipe clamping grooves 331 can be used for the insertion of bent pipes, and the pipe clamping grooves 331 between the two pipe clamping dies 33 after combination are closed to form the pipe clamping cavities.

The transverse guide rail 5 is fixed on the inner side wall of the frame 1, the length distribution direction of the transverse guide rail 5 is parallel to the axial direction of the rotating main shaft 2, and the side wall where the transverse guide rail 5 is located is adjacent to the side wall where the rotating main shaft 2 is located.

Referring to fig. 2, the cutting mechanism 4 includes a transverse sliding base 41, a transverse screw 42, a transverse motor 43, a carrying base 44 and a laser cutting head 45, wherein the transverse sliding base 41 is slidably inserted and mounted on the transverse guide rail 5. The transverse screw 42 is rotatably mounted on the transverse rail 5 and is parallel to the longitudinal direction of the transverse rail 5. The transverse motor 43 is fixed on the transverse guide rail 5, and an output shaft of the transverse motor 43 is coaxially fixed with the transverse screw 42, so that linkage between the transverse motor 43 and the transverse screw 42 is realized.

A vertical guide rail 411 is fixed on the horizontal sliding base 41, the length direction of the vertical guide rail 411 is perpendicular to the horizontal guide rail 5, and the object carrying seat 44 is installed on the vertical guide rail 411 in a sliding and inserting mode, so that the object carrying seat 44 can move vertically. In order to drive the loading seat 44 to ascend and descend, a lifting assembly 6 is disposed on the transverse sliding seat 41, and specifically, the lifting assembly 6 includes a lifting motor 61 and a lifting screw 62, and the lifting motor 61 is fixed on the vertical guide rail 411. The threaded hole that runs through about having seted up on carrying the thing seat 44, lifting screw 62 rotates and installs on vertical guide rail 411 and wear to locate the threaded hole on carrying the thing seat 44, forms screw-thread fit this moment between lifting screw 62 and the thing seat 44, and lifting screw 62's length distribution direction is on a parallel with vertical guide rail 411 simultaneously. The output shaft of the lifting motor 61 is coaxially fixed with the lifting screw 62, so that the linkage between the lifting motor 61 and the lifting screw 62 is realized.

On laser cutting head 45 was fixed in and carries thing seat 44, during specific application, with the help of the drive of horizontal motor 43, can realize carrying the lateral shifting of thing seat 44, and through elevator motor 61's drive, can realize carrying the vertical movement of thing seat 44, through the removal of carrying thing seat 44, the position of adjustable laser cutting head 45 to the realization appoints laser cutting head 45 to get up the purpose of cutting the position.

Example 2:

in order to improve the machining efficiency of the bent pipe, the present application also provides a pipe flat cutting machine, and referring to fig. 3 and 4, the installation manner of the clamping base 31 on the rotating spindle 2 and the structure of the driving assembly 9 of the moving base 32 are mainly optimized, and the rest structures are the same as those of embodiment 1. Specifically, the rotating spindle 2 is connected with the clamping base 31 through the mounting support 21, the mounting support 21 is fixed on the rotating spindle 2, the base plate of the clamping base 31 in this embodiment is in a disc shape, the clamping base 31 is rotatably mounted on the mounting support 21, and the mounting support 21 is provided with the rotation angle mechanism 7 for driving the clamping base 31 to rotate.

Referring to fig. 4 and 5, specifically, the corner mechanism 7 includes a corner block 71 and a corner motor 72, the corner block 71 is a circular ring structure formed by two half rings fastened together, a cavity at the center of the corner block 71 is named as a through hole 711, worm gear teeth 712 are integrally arranged on the outer circumference of the corner block 71, and an internal thread is arranged on the inner wall of the through hole 711 of the corner block 71. The corner block 71 is rotatably mounted on the mounting bracket by two collars 713, and the rotation axis of the corner block 71 is along the tangential direction of the clamping base 31.

The clamping base 31 is provided with an arc-shaped groove 311, the central angle of the arc-shaped groove 311 corresponding to the rotation center of the clamping base 31 is larger than 90 degrees, 145 degrees can be specifically selected, the arc-shaped groove 311 enables an arc-shaped block 312 to be formed on the clamping base 31, an external thread 313 is arranged on the arc-shaped block 312, two half rings of the corner block 71 are buckled on the arc-shaped block 312 of the clamping base 31 when combined, and the external thread 313 on the arc-shaped block 312 is matched with an internal thread on the corner block 71 after buckling.

The corner motor 72 is fixed on the mounting support 21, an external thread 313 is formed on an output shaft of the corner motor 72, and the output shaft of the corner motor 72 is meshed with the corner block 71, so that the corner block 71 is driven to rotate, and when the corner block 71 rotates, the clamping base 31 can be driven to rotate through thread matching.

Referring to fig. 4 and 6, in order to facilitate installation of the movable seat 32, in this embodiment, the vertical plate 8 is fixed on the clamping base 31, the slide rail 34 is installed on the vertical plate 8, and the movable seat 32 is slidably inserted into the slide rail 34 installed on the vertical plate 8, in this embodiment, a position of the movable seat 32 for connecting with the slide rail 34 is provided with a abdicating notch 321, the driving assembly 9 of this embodiment includes a spiral block 91 and a driving tooth 92, a spiral strip 911 is integrally provided on an outer circumferential side wall of the spiral block 91, and the spiral block 91 is installed on the vertical plate 8 through the limiting assembly 10. Specific spacing subassembly 10 includes limit stop 101 and centering shaft lever 102, and limit stop 101 is provided with two, is fixed in on the riser 8 and is located the notch 321 of stepping down, and two now for the baffle along the length direction distribution of riser 8 and distribute in the both ends of spiral piece 91, and have seted up axle socket 103 on the limit stop 101. One end of the centering shaft rod 102 is fixed on the movable base 32, and the other end penetrates through the through-shaft grooves 103 on the two limit stops 101 and the centers of the spiral blocks 91 in sequence and serves as a rotating shaft of the spiral blocks 91, at this time, the limit stops 101 restrict the axial movement of the spiral blocks 91, and the centering shaft rod 102 restricts the radial movement of the spiral blocks 91, so that the spiral blocks 91 can only rotate on the vertical plate 8 in situ.

The driving teeth 92 are arranged on the side wall of the movable seat 32 in the abdicating notch 321, and the driving teeth 92 are engaged with the spiral strip 911 on the spiral block 91, so that the movable seat 32 can be driven to move along the slide rail 34 by means of the screw thread through the rotation of the spiral block 91.

In order to better drive the screw block 91 to rotate, a rotating assembly 11 is disposed on the vertical plate 8, the rotating assembly 11 specifically includes a rotating motor 111, a rotating worm 112 and a rotating worm wheel 113, an object of the rotating motor 111 is fixed on a side of the vertical plate 8 opposite to the limit stop 101, and an output shaft of the rotating motor 111 penetrates through the vertical plate 8 and reaches a side of the limit stop 101. The rotating worm 112 is fixed on the output shaft of the rotating motor 111, the rotating worm wheel 113 is coaxially fixed with the spiral block 91, the two limit stoppers 101 respectively abut against the spiral block 91 and the end face of the rotating worm wheel 113 at the moment, the diameter of the rotating worm wheel 113 is smaller than that of the spiral block 91, and the rotating worm 112 is meshed with the rotating worm wheel 113, so that the rotating motor 111 can drive the spiral block 91 to rotate.

The implementation principle of a tubular product flat-end cutting machine of this application embodiment does: during the use, put into two double-layered pipe die 33 between with the return bend to by two double-layered pipe die 33 with the return bend clip, laser cutting head 45 is close to towards the return bend afterwards, and rotatory main shaft 2 is rotatory simultaneously, cuts the return bend. After the one end cutting of return bend was accomplished, centre gripping base 31 is rotatory, switches the other end of return bend to the cutting station, is cut the return bend by laser cutting head 45 equally, and this kind of clamping mode can be through a clamping, accomplishes the both ends cutting of return bend to the mode of laser cutting is difficult to make the fracture department of return bend leave flaws such as burr, consequently can have better trimming effect to the return bend.

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

Claims

1. The utility model provides a tubular product flat-nose cutting machine which characterized in that: the cutting machine comprises a rack (1), a rotating main shaft (2) which is arranged on the rack (1) and is provided with a bent pipe clamping mechanism (3), a transverse guide rail (5) which is arranged on the rack (1) and is parallel to the axial direction of the rotating main shaft (2), and a cutting mechanism (4) which is arranged on the transverse guide rail (5) in a sliding manner, wherein a laser cutting head (45) is arranged on the cutting mechanism (4).

2. The pipe flat cutting machine according to claim 1, characterized in that: cutting mechanism (4) including slide install horizontal slide (41) on horizontal guide (5), rotate install on horizontal guide (5) and the screw thread wears to locate horizontal screw rod (42) on horizontal slide (41), be fixed in horizontal guide (5) on and output shaft and horizontal screw rod (42) linkage horizontal motor (43), go up and down to set up and carry thing seat (44) on horizontal slide (41), laser cutting head (45) are fixed in and carry on thing seat (44) on, and be provided with between horizontal slide (41) and the thing seat (44) and be used for driving about and carry the lifting unit (6) that thing seat (44) were elevating movement.

3. The pipe flat cutting machine according to claim 2, characterized in that: be fixed with vertical guide rail (411) on horizontal slide (41), carry thing seat (44) and slide and install on vertical guide rail (411), lifting unit (6) including be fixed in elevator motor (61) on vertical guide rail (411), be fixed in elevator motor (61) output shaft on and the horizontal slide of rotation axis perpendicular to (41) moving direction's lifting screw (62), lifting screw (62) are located vertical guide rail (411), the screw hole of having seted up upper and lower through on carrying thing seat (44) just lifting screw (62) wear to locate in the screw hole on carrying thing seat (44) and form threaded connection with carrying thing seat (44).

4. The pipe flat cutting machine according to claim 1, characterized in that: elbow pipe fixture (3) are including installing centre gripping base (31) on rotary main shaft (2), sliding and installing on centre gripping base (31) and along radial removal seat (32) that slide of rotary main shaft (2), be fixed in centre gripping base (31) respectively and remove double-layered pipe die (33) on seat (32), be located centre gripping base (31) and remove on seat (32) all seted up on double-layered pipe die (33) and press from both sides tub groove (331), two clamp tub groove (331) between each other behind double-layered pipe die (33) amalgamation form and press from both sides the lumen, and be provided with on centre gripping base (31) and be used for ordering about drive assembly (9) that remove seat (32) motion.

5. The pipe flat cutting machine according to claim 4, wherein: the clamping device is characterized in that a sliding rail (34) is installed on the clamping base (31), the moving base (32) is installed on the sliding rail (34), the driving assembly (9) comprises a driving cylinder (35) which is fixed on the clamping base (31) through a cylinder body and is fixed on the moving base (32) through a piston rod.

6. The pipe flat cutting machine according to claim 4, wherein: a slide rail (34) is arranged on the clamping base (31), the moving base (32) is arranged on the slide rail (34), the part of the movable seat (32) used for being connected with the sliding rail (34) is provided with a yielding notch (321), the driving component (9) comprises a spiral block (91) which is rotatably arranged on the clamping base (31) and is positioned in the abdicating notch (321), and a driving tooth (92) which is arranged on the movable seat (32) and is positioned on the inner side wall of the abdicating notch (321), the outer side wall of the spiral block (91) is provided with a spiral strip (911), the spiral strip (911) on the spiral block (91) forms thread fit with a driving tooth (92) on the moving seat (32), and a rotating component (11) for driving the spiral block (91) to rotate and a limiting component (10) for limiting the movement of the spiral block (91) are arranged on the clamping base (31).

7. The pipe flat cutting machine according to claim 6, wherein: the rotating assembly (11) comprises a rotating motor (111) arranged on the clamping base (31), a rotating worm (112) fixed on an output shaft of the rotating motor (111), and a rotating worm wheel (113) which is integrally fixed on the screw block (91) and coaxially rotates with the screw block (91), wherein the rotating worm (112) is meshed with the rotating worm wheel (113).

8. The pipe flat cutting machine according to claim 7, wherein: spacing subassembly (10) are fixed in on centre gripping base (31) and lie in spacing dog (101) of stepping down notch (321), are fixed in and move on seat (32) and lie in centering axostylus axostyle (102) of stepping down notch (321), along the direction of motion distribution that moves seat (32) between spacing dog (101), spiral piece (91) and rotatory worm wheel (113) lie in between two spacing dogs (101) and two spacing dogs (101) contradict respectively on the terminal surface of spiral piece (91) and rotatory worm wheel (113), axial groove (103) have been seted up on spacing dog (101), the center of crossing axial trough (103), spiral piece (91) and rotatory worm wheel (113) on spacing dog (101) is passed in proper order to the free end of centering axostylus axostyle (102).

9. The pipe flat cutting machine according to any one of claims 4 to 8, wherein: be fixed with erection support (21) on rotatory main shaft (2), centre gripping base (31) rotate to be installed on erection support (21), the axis of rotation of centre gripping base (31) perpendicular to the axis of rotation of rotatory main shaft (2), just be provided with between erection support (21) and centre gripping base (31) and be used for driving about the rotatory corner mechanism (7) of centre gripping base (31).

10. The pipe flat cutting machine according to claim 9, wherein: the corner mechanism (7) comprises a corner block (71) which is rotatably installed on the installation support (21) and a rotating shaft of which is arranged along the tangential direction of the clamping base (31), and a corner motor (72) which is fixed on the installation support (21) and of which the output shaft is provided with an external thread (313), the outer side wall of the corner block (71) is provided with a worm gear (712), the output shaft of the corner motor (72) is meshed with the worm gear (712), the center of the corner block (71) is provided with a through hole (711), the inner wall of the through hole (711) is provided with an internal thread, the clamping base (31) is provided with an arc-shaped groove (311), the arc-shaped groove (311) enables the clamping base (31) to form an arc-shaped block (312), the arc-shaped block (312) is provided with an external thread (313), and the arc-shaped block (312) is arranged in the through hole (711) in the center of the corner block (71) in a penetrating way, and the external thread (313) on the arc-shaped block (312) is matched with the internal thread on the corner block (71).