CN117000835A - U-shaped pipe machining equipment and method - Google Patents

Abstract

The application provides U-shaped pipe processing equipment and a method, wherein the equipment comprises a cutting mechanism, a pipe end processing mechanism, a pipe bending mechanism and a necking and flattening mechanism which are sequentially arranged, a pipe fitting sequentially passes through the cutting mechanism to cut materials, the pipe end processing mechanism performs one-end flaring, the pipe bending mechanism performs pipe bending processing and the necking and flattening mechanism performs cutting off of excess materials; the pipe bending mechanism comprises a box body and a die clamping box arranged on one side of the box body, the die clamping box is rotationally connected with the box body through a pipe bending shaft, a round die is arranged at the end part of the pipe bending shaft, a die clamping corresponding to the round die is arranged on the die clamping box, and the position of a pipe fitting to be bent is located between the die clamping and the round die, so that when the die clamping box rotates relative to the box body, the die clamping and the round die are used for bending the pipe.

Description

U-shaped pipe machining equipment and method

Technical Field

The application relates to the field of pipe fitting machining equipment, in particular to U-shaped pipe machining equipment and a method.

Background

At present, when carrying out the cutting, the pipe section processing, return bend and cut excess material processing to the pipe fitting, generally need adopt the equipment cooperation of more than two kinds to carry out the pipe fitting processing, then when transporting between different equipment, appear the location inaccuracy easily and lead to the problem that each processing procedure of pipe fitting appears the error, and then very big influence the yields of pipe fitting processing.

Disclosure of Invention

The application aims to provide U-shaped pipe processing equipment and method for solving the technical problems.

In order to solve the technical problems, the application provides U-shaped pipe processing equipment which comprises a cutting mechanism, a pipe end processing mechanism, a pipe bending mechanism and a necking and flattening mechanism which are sequentially arranged, wherein a pipe fitting sequentially passes through the cutting mechanism to cut materials, the pipe end processing mechanism performs one-end flaring, the pipe bending mechanism performs pipe bending processing and the necking and flattening mechanism performs cutting off of excess materials; the pipe bending mechanism comprises a box body and a die clamping box arranged on one side of the box body, the die clamping box is rotationally connected with the box body through a pipe bending shaft, a round die is arranged at the end part of the pipe bending shaft, a die clamping corresponding to the round die is arranged on the die clamping box, and the position of a pipe fitting to be bent is located between the die clamping and the round die, so that when the die clamping box rotates relative to the box body, the die clamping and the round die are used for bending the pipe.

Further, the pipe bending mechanism further comprises a movably arranged pipe bending trolley, a rotatable rotating main shaft arranged on one side of the pipe bending trolley, and a plurality of clamping jaws arranged at the end part of the rotating main shaft, so that when the clamping jaws clamp the pipe fitting, the rotating main shaft can drive the pipe fitting to rotate along the axis of the pipe fitting, and the pipe bending trolley can drive the pipe fitting to axially move along the pipe fitting.

Further, the necking and flattening mechanism comprises at least two profiling clamping dies which are oppositely arranged, a shaping seat arranged on one side of the profiling clamping dies, and a shaping hole formed in the shaping seat, wherein a cutting knife is arranged in the shaping seat, when the pipe fitting is arranged at the profiling clamping dies for fixing, the end to be cut of the pipe fitting stretches into the shaping seat from the shaping hole, and the cutting knife cuts off the residual material at the end to be cut of the pipe fitting.

Further, the shaping seat is rotationally arranged, the shaping core is arranged in the shaping seat, one end of the shaping core extends out from the shaping hole, and a gap is formed between the outer ring of the shaping core and the inner ring of the shaping hole, so that when the end to be cut of the pipe fitting extends into the shaping hole, the end to be cut of the pipe fitting is arranged at the gap.

Further, one side of the profiling clamping die is connected with an auxiliary clamping die, and a clearance position is arranged between the clamping position of the profiling clamping die and the clamping position of the auxiliary clamping die.

Further, the clamping position of the profiling clamping die is in a U-shaped structure, and one end of the U-shaped structure corresponds to the clamping position of the auxiliary clamping die.

The application also discloses a U-shaped pipe processing method, which comprises the following steps:

step one, a pipe fitting is subjected to cutting with a set length by a cutting mechanism;

step two, conveying the cut pipe fitting to a pipe end processing mechanism, and flaring one end of the pipe fitting through the pipe end processing mechanism;

step three, moving the flared pipe fitting to a pipe bending mechanism, and carrying out pipe bending processing on the pipe fitting through the pipe bending mechanism;

step four, the pipe fitting after the pipe bending is moved to the necking and flattening mechanism, and the residual material at one end of the pipe fitting, which is not flared, is cut off;

and fifthly, blanking the pipe fitting.

Further, in the third step, after pipe fitting bending is completed, the pipe fitting is pushed to a position far away from the clamping die by the pipe bending trolley, and then the main shaft is rotated to drive the pipe fitting to rotate for a certain angle.

Further, the pipe fitting is conveyed to move among the material opening mechanism, the pipe end processing mechanism, the pipe bending mechanism and the necking and flattening mechanism through the mechanical arm.

Further, after the pipe fitting is pushed to a position far away from the clamping die by the pipe bending trolley, the main shaft is rotated to drive the pipe fitting to rotate by 90 degrees.

The application has the beneficial effects that:

1. through the cooperation of the material cutting mechanism, the pipe end machining mechanism, the pipe bending mechanism and the cutting excess material structure, the pipe fitting can be directly formed into a finished product after being sequentially machined by each mechanism, and the pipe fitting does not need to be carried among a plurality of devices, so that the problem of positioning errors during transferring among the devices is avoided;

2. the profiling clamping die in the necking and flattening mechanism is matched with the auxiliary clamping die to clamp the U-shaped pipe fitting in a targeted manner, and the radian of the bent pipe is ensured to be stably clamped, so that the end part of the pipe fitting is ensured not to shake when the excess material is cut off;

3. the avoiding position between the profiling clamping die and the auxiliary clamping die can be increased, so that the stability and convenience in conveying the pipe fitting to or taking the pipe fitting out of the necking plain-end mechanism by the mechanical arm can be improved.

Drawings

Fig. 1 is a schematic structural view of the present application.

FIG. 2 is a schematic view of the transverse roller and the longitudinal roller of the present application.

FIG. 3 is a schematic view of a feed clamp of the present application.

Fig. 4 is a schematic view of the precutting knife of the present application.

FIG. 5 is a schematic view of a snap clamp of the present application.

Fig. 6 is a schematic view of a punch of the present application.

Fig. 7 is a schematic view of a punch clamping die of the present application.

FIG. 8 is a schematic view of the structure of the pipe bending mechanism of the present application.

Fig. 9 is a schematic view of the pipe fitting of the present application disengaged after completion of the pipe bending.

Fig. 10 is a schematic view of the necking plain mechanism of the present application.

FIG. 11 is a schematic view of a profiling clamp of the present application.

FIG. 12 is a schematic view of the clamping positions of the profiling clamp and the auxiliary clamp of the present application.

Fig. 13 is a schematic view of the swage mount of the present application.

Fig. 14 is a schematic view of a cutting blade of the present application.

Fig. 15 is a schematic view of the processing of the U-shaped tube of the present application.

Reference numerals: 1. a material cutting mechanism; 11. a horizontal roller; 12. a longitudinal roller; 13. feeding a clamping die; 14. a pre-cutting knife; 15. breaking the clamping die; 2. a pipe end processing mechanism; 21. clamping a die by a punch; 22. a punch; 3. a pipe bending mechanism; 31. a case; 32. a clamping box; 33. a bent tube shaft; 34. round mould; 35. clamping a die; 36. a pipe bending trolley; 37. rotating the main shaft; 38. a clamping jaw; 4. a necking and flattening mechanism; 41. profiling clamping mold; 42. shaping seat; 43. shaping the hole; 44. a cutting knife; 45. shaping the punching core; 46. auxiliary clamping dies; 47. avoidance of yielding; 5. and a pipe fitting.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the application, fall within the scope of protection of the application.

It will be appreciated by those skilled in the art that in the present disclosure, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or positional relationship based on that shown in the drawings, which is merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms should not be construed as limiting the present application.

It will be understood that the terms "a" and "an" should be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, while in another embodiment, the number of elements may be plural, and the term "a" should not be interpreted as limiting the number.

As shown in fig. 1-15, the application provides a U-shaped pipe processing device, which comprises a cutting mechanism 1, a pipe end processing mechanism 2, a pipe bending mechanism 3 and a necking and flattening mechanism 4 which are sequentially arranged, wherein a pipe fitting 5 sequentially passes through the cutting mechanism 1 for cutting, the pipe end processing mechanism 2 for one-end flaring, the pipe bending mechanism 3 for pipe bending and the necking and flattening mechanism 4 for cutting off excess materials; the pipe bending mechanism 3 comprises a box body 31 and a clamping box 32 arranged on one side of the box body 31, the clamping box 32 is rotationally connected with the box body 31 through a pipe bending shaft 33, a round die 34 is arranged at the end part of the pipe bending shaft 33, a clamping die 35 corresponding to the round die 34 is arranged on the clamping box 32, and the position of the pipe fitting 5 to be bent is located between the clamping die 35 and the round die 34, so that when the clamping box 32 rotates relative to the box body 31, the clamping die 35 and the round die 34 bend the pipe fitting 5.

Specifically, when pipe fitting carries to pipe bending mechanism department, the pipe fitting treat that the return bend is handled between circle mould and clamp mould, press from both sides the mould and be close to circle mould department for press from both sides mould and circle mould cooperation and carry out the centre gripping to pipe fitting treat that the return bend department is fixed, the curved pipe axle rotates this moment, makes the clamp mould case rotate for the box, and then makes the clamp mould rotate along the axis of curved pipe axle, and the curved pipe axle rotates along self axis simultaneously afterwards, and then carries out the pipe bending to the centre gripping position of pipe fitting.

In the preferred embodiment of this scheme, the one end that the pipe fitting kept away from the circle mould is equipped with the core bar that movable set up, and when the pipe fitting carries out the return bend processing, the core bar wears to establish into inside the pipe fitting and supports the pipe fitting from the other end of pipe fitting, increases the stability of pipe fitting return bend.

The pipe bending shaft is controlled by the servo motor to rotate, and the clamping die on the die clamping box is clamped by the cylinder driving connecting rod mechanism, so that the clamping die is close to the round die to clamp the pipe fitting or far away from the round die to loosen the pipe fitting.

It should be noted that the material opening mechanism 1 comprises a plurality of transverse rollers 11, a plurality of longitudinal rollers 12, a movable material feeding clamping die 13, a pre-cutting knife 14 and a stretch-breaking assembly which are arranged in sequence in a staggered manner; when the pipe passes through the transverse rollers, the transverse rollers 11 straighten the pipe horizontally, when the pipe passes through the longitudinal rollers 12, the longitudinal rollers 12 straighten the pipe longitudinally, then one end of the pipe is arranged between the feeding clamping dies 13, the feeding clamping dies 13 clamp the pipe, the pipe is pulled to the pre-cutting knife 14 by the movement of the feeding clamping dies, after the position to be cut of the pipe is moved to the position of the pre-cutting knife 14, the pipe is clamped by the fixing clamping dies of one side of the pre-cutting knife 14, which is far away from the breaking clamping dies 15, and the breaking clamping dies 15, then the pre-cutting knife 14 cuts along the circumferential direction of the pipe, so that cutting lines appear in the circumferential direction of the pipe, the pipe is ensured to be not to be completely cut, the position of the fixing clamping dies is kept fixed, and the breaking clamping dies 15 are moved away from the fixing clamping dies, so that the pipe can be broken, and the mouth shrinkage rate of the pipe can be ensured.

The clamping and loosening of the feeding clamping die are controlled by an air cylinder, a guide rail is arranged at the bottom of the feeding clamping die, and a servo motor controls the feeding clamping die to move along the guide rail in a lead screw transmission mode; the clamping and loosening of the stretch-breaking clamping die are controlled by an air cylinder, a guide rail is arranged at the bottom of the stretch-breaking clamping die, and the stretch-breaking clamping die is controlled by another air cylinder to move along the guide rail; the cutter is located on the cutter holder in advance, and the cutter holder is controlled to rotate through servo motor and synchronous pulley, and then drives the cutter holder and rotate to the through-hole has been seted up to the central point of cutter holder, and the pipe fitting wears to establish through the through-hole department, when making the cutter holder rotate, drives the cutter in advance and rotates the cutting along the circumference of pipe fitting, through the cylinder that sets up on the cutter holder this moment, makes the cylinder control cutter in advance be close to pipe fitting department, and then steerable cutter in advance cuts.

Specifically, the pipe end processing mechanism 2 includes a punch clamping die 21 and a punch 22, when the pipe is subjected to stretch-breaking and cutting, the pipe is conveyed to the punch clamping die 21 for clamping and fixing, the punch 22 is aligned to the end of the pipe to be flared, and then the punch performs punching flaring on the end of the pipe, so that the pipe end flaring processing procedure can be completed.

The punch clamping die is clamped or loosened through the control of the air cylinder, an air pump is connected to one side, away from the punch clamping die, of the punch, and the punch is controlled to punch, expand and reset the pipe end through the air pump.

Preferably, the pipe bending mechanism 3 further includes a movably disposed pipe bending trolley 36, a rotatable rotating spindle 37 disposed on one side of the pipe bending trolley 36 facing the box 31, and a plurality of clamping jaws 38 disposed on an end of the rotating spindle 37, so that when the plurality of clamping jaws 38 clamp the pipe 5, the rotating spindle 37 can drive the pipe 5 to rotate along the pipe axis, and the pipe bending trolley 36 can drive the pipe 5 to move along the pipe axis.

Specifically, when pipe fitting carries out the return bend, carry out the centre gripping through a plurality of clamping jaws to the pipe fitting, and then guarantee to press from both sides mould and round mould when carrying out the return bend to the pipe fitting, the position of pipe fitting self is stable enough, and the cooperation sets up return bend dolly and rotatory main shaft simultaneously, make the pipe fitting can follow pipe fitting axial under the drive of return bend dolly and remove, and rotate along the pipe fitting axis under rotatory main shaft's drive, guarantee that follow-up pipe fitting breaks away from round mould and press from both sides the mould and remove to the next process time, the pipe fitting can not appear colliding with round mould or clamp the mould and interfere, guarantee the yields of pipe fitting processing.

The servo motor controls the bent pipe trolley to move along the track in a lead screw transmission mode, and the bent pipe trolley is also provided with a motor which is connected with the rotating main shaft in a synchronous pulley transmission mode, so that the rotating main shaft can rotate under the drive of the motor; the manner of clamping or unclamping of the plurality of clamping jaws is similar to that of the existing mechanical clamping jaw structure, and is not described in detail herein.

Preferably, the necking and flattening mechanism 4 comprises at least two profiling clamping dies 41, a profiling seat 42 arranged on one side of the profiling clamping dies 41 and a profiling hole 43 formed in the profiling seat 42, wherein a cutting knife 44 is arranged in the profiling seat 42, when the pipe fitting 5 is placed in the profiling clamping dies 41 for fixing, the end to be cut of the pipe fitting 5 stretches into the profiling seat 42 from the profiling hole 43, and the cutting knife 44 cuts off the residual material at the end to be cut of the pipe fitting 5.

Specifically, when the pipe fitting is conveyed to the necking and flattening mechanism, two sides of the pipe fitting bent pipe are clamped and fixed through two profiling clamping dies which are arranged oppositely, and then the end to be cut of the pipe fitting stretches into the shaping seat from the shaping hole, and then the cutting tool is used for cutting off the residual materials at the end to be cut of the pipe fitting.

The clamping or loosening of the two profiling clamping dies which are oppositely arranged is controlled through the air cylinder, one side of the shaping seat is provided with the three-phase motor and the servo motor, the three-phase motor drives the shaping seat to rotate and then synchronously drives the cutting knife to rotate so as to control the cutting knife to rotationally cut the pipe fitting, the servo motor controls the shaping seat to move back and forth in a screw transmission mode, and then controls the distance between the cutting knife and the pipe fitting, so that the pipe fitting stretches into the shaping hole or is far away from the shaping hole relative to the shaping seat.

Preferably, the shaping seat 42 is rotatably disposed, the shaping seat 42 is internally provided with a shaping core 45, and one end of the shaping core 45 extends from the shaping hole 43, and a gap is formed between an outer ring of the shaping core 45 and an inner ring of the shaping hole 43, so that when the end to be cut of the pipe 5 extends into the shaping hole 43, the end to be cut of the pipe 5 is disposed at the gap.

Specifically, when pipe fitting one end stretches into the plastic hole, the pipe fitting is arranged in the gap department between plastic core outer lane and the plastic hole inner circle to guarantee the inside and outside spacing guide of pipe fitting wait to cut the end through plastic hole and plastic core, the plastic seat is rotatory and drive the cutting knife and rotate afterwards, and the axial displacement that the shaping seat drove the cutting knife along the plastic core is close to the pipe fitting wait to cut the end this moment, and then carries out the excision clout through the cutting knife to pipe fitting tip.

Preferably, an auxiliary clamping die 46 is connected to one side of the profiling clamping die 41, and a clearance gap 47 is provided between the clamping position of the profiling clamping die 41 and the clamping position of the auxiliary clamping die 46.

Specifically, the bent pipe position of the pipe fitting is clamped through the profiling clamping die, and meanwhile, one end of the pipe fitting, which does not need to be cut off, is clamped through the auxiliary clamping die, so that stability of the pipe fitting when the pipe fitting is cut off the residual material is guaranteed to the greatest extent, and meanwhile, the pipe fitting can be placed on the profiling clamping die or taken out from the profiling clamping die from the avoiding position through the avoiding position assurance manipulator.

In an embodiment of the present disclosure, the clamping position of the profiling clamping mold 41 is configured in a "U" structure, and one end of the "U" structure corresponds to the clamping position of the auxiliary clamping mold 46.

The application also discloses a U-shaped pipe processing method, which comprises the following steps:

step one, a pipe fitting 5 is subjected to cutting with a set length by a cutting mechanism 1;

step two, conveying the cut pipe fitting 5 to the pipe end machining mechanism 2, and flaring one end of the pipe fitting 5 through the pipe end machining mechanism 2;

step three, moving the flared pipe fitting 5 to the position of the pipe bending mechanism 3, and carrying out pipe bending processing on the pipe fitting 5 through the pipe bending mechanism 3;

step four, the pipe fitting 5 after the pipe bending is moved to the position of the necking and flattening mechanism 4, and the surplus material at one end of the pipe fitting 5 which is not flared is cut off;

and fifthly, blanking the pipe fitting 5.

Preferably, in the third step, after the pipe fitting 5 is bent, the bending trolley 36 pushes the pipe fitting 5 to a position away from the clamping die 35, and then the spindle 37 is rotated to rotate the pipe fitting 5 by a certain angle.

In the preferred embodiment of the present solution, when the pipe bending trolley 36 pushes the pipe fitting 5 to a position far away from the clamping die 35, the rotating spindle 37 drives the pipe fitting 5 to rotate 90 ° so as to ensure that the pipe fitting can be separated from the round die and the clamping die at the pipe bending position of the pipe fitting after moving and rotating, and further, the pipe fitting is sufficiently stable when being taken out from the pipe fitting by the manipulator and conveyed to the next procedure, so that collision of the pipe fitting is avoided, and correct direction of the pipe fitting is ensured.

Preferably, the feeding mechanism 1, the pipe end processing mechanism 2, the pipe bending mechanism 3 and the necking and flattening mechanism 4 are moved by a mechanical arm for conveying the pipe fitting 5.

The conveying manner of the manipulator is similar to the existing manipulator, and detailed description is omitted here.

The present application is not limited to the above-mentioned preferred embodiments, and any person who can obtain other various products under the teaching of the present application can make any changes in shape or structure, and all the technical solutions that are the same or similar to the present application fall within the scope of the present application.

Claims (10)

1. The utility model provides a U type pipe processing equipment which characterized in that: the pipe cutting device comprises a cutting mechanism (1), a pipe end machining mechanism (2), a pipe bending mechanism (3) and a necking and flattening mechanism (4) which are sequentially arranged, wherein a pipe fitting (5) sequentially passes through the cutting mechanism (1) for cutting, the pipe end machining mechanism (2) for carrying out one-end flaring, the pipe bending mechanism (3) for carrying out pipe bending machining and the necking and flattening mechanism (4) for cutting off excess materials; wherein, return bend mechanism (3) include box (31), locate clamp mould case (32) of box (31) one side, clamp mould case (32) are rotation through bent pipe axle (33) and box (31) and are connected, bent pipe axle (33) tip is equipped with circle mould (34), be equipped with on clamp mould case (32) with the clamp mould (35) that circle mould (34) correspond, the waiting of pipe fitting (5) is located between clamp mould (35) and circle mould (34), so that clamp mould case (32) carry out the pipe bending with circle mould (34) when rotating for box (31).

2. The U-shaped tube processing apparatus of claim 1, wherein: the pipe bending mechanism (3) further comprises a movably arranged pipe bending trolley (36), a rotatable rotating main shaft (37) arranged on one side of the pipe bending trolley (36) towards the box body (31), and a plurality of clamping jaws (38) arranged on the end part of the rotating main shaft (37), so that when the clamping jaws (38) clamp the pipe (5), the rotating main shaft (37) can drive the pipe (5) to rotate along the axis of the pipe, and the pipe bending trolley (36) can drive the pipe (5) to axially move along the pipe.

3. The U-shaped tube processing apparatus of claim 1, wherein: the necking and flattening mechanism (4) comprises at least two profiling clamping dies (41) which are oppositely arranged, a shaping seat (42) arranged on one side of the profiling clamping dies (41), and a shaping hole (43) formed in the shaping seat (42), wherein a cutting knife (44) is arranged in the shaping seat (42), when the pipe fitting (5) is arranged at the profiling clamping dies (41) to be fixed, the end to be cut of the pipe fitting (5) stretches into the shaping seat (42) from the shaping hole (43), and the cutting knife (44) cuts off the residual material at the end to be cut of the pipe fitting (5).

4. A U-shaped tube processing apparatus as defined in claim 3, wherein: the shaping seat (42) is rotationally arranged, the shaping core (45) is arranged in the shaping seat (42), one end of the shaping core (45) extends out from the shaping hole (43), a gap is formed between the outer ring of the shaping core (45) and the inner ring of the shaping hole (43), and when the end to be cut of the pipe fitting (5) extends into the shaping hole (43), the end to be cut of the pipe fitting (5) is arranged at the gap.

5. A U-shaped tube processing apparatus as defined in claim 3, wherein: an auxiliary clamping die (46) is connected to one side of the profiling clamping die (41), and a clearance position (47) is arranged between the clamping position of the profiling clamping die (41) and the clamping position of the auxiliary clamping die (46).

6. The U-shaped tube processing apparatus of claim 5, wherein: the clamping position of the profiling clamping die (41) is in a U-shaped structure, and one end of the U-shaped structure corresponds to the clamping position of the auxiliary clamping die (46).

7. The U-shaped pipe processing method is characterized by comprising the following steps of:

step one, a pipe fitting (5) is subjected to cutting with a set length by a cutting mechanism (1);

step two, conveying the cut pipe fitting (5) to a pipe end machining mechanism (2), and flaring one end of the pipe fitting (5) through the pipe end machining mechanism (2);

step three, moving the flared pipe fitting (5) to the position of the pipe bending mechanism (3), and carrying out pipe bending processing on the pipe fitting (5) through the pipe bending mechanism (3);

fourthly, moving the pipe fitting (5) after the pipe bending to the necking and flattening mechanism (4), and cutting off the residual material at one end of the pipe fitting (5) which is not flared;

and fifthly, blanking the pipe fitting (5).

8. The method for processing the U-shaped pipe according to claim 7, wherein: in the third step, after the pipe fitting (5) is bent, the pipe bending trolley (36) pushes the pipe fitting (5) to a position far away from the clamping die (35), and then the main shaft (37) is rotated to drive the pipe fitting (5) to rotate for a certain angle.

9. The method for processing the U-shaped pipe according to claim 7, wherein: the feeding mechanism (1), the pipe end machining mechanism (2), the pipe bending mechanism (3) and the necking and flattening mechanism (4) are moved through a mechanical arm conveying pipe fitting (5).

10. The method for processing the U-shaped pipe according to claim 8, wherein: when the pipe fitting (5) is pushed to a position far away from the clamping die (35) by the pipe bending trolley (36), the rotary main shaft (37) drives the pipe fitting (5) to rotate by 90 degrees.