CN218049932U - 9-shaped pipe bender - Google Patents

Abstract

The utility model discloses a 9 font bending machine, include: the pipe bending machine comprises a frame, a pipe feeding trolley movably arranged on the frame, a machine head arranged in front of the frame and a pipe bending arm with a connecting sleeve at one end, wherein a main shaft is vertically supported in front of the machine head through a bearing group, the bottom end of the main shaft extends out of the lower part of the machine head and then is connected with a driving device, and the main shaft is driven by the driving device to rotate relative to the axis of the main shaft; the bent pipe arm is fixedly sleeved on the main shaft extending out of the upper part of the machine head through a connecting sleeve, and a lower wheel die and a main clamping frame are fixedly arranged on the bent pipe arm; the upper wheel die is arranged on the main clamping frame through the lifting device and is positioned above the lower wheel die, and the upper wheel die can move downwards through the lifting device to be matched with the lower wheel die to form a complete bent pipe die cavity for bending the 9-shaped bent pipe fitting. The bending machine has the advantages of compact structure, convenience in use and maintenance and suitability for bending 9-shaped bent pipes.

Description

9-shaped pipe bender

Technical Field

The utility model relates to a bending machine especially relates to a 9 font bending machine.

Background

With the continuous development of modern science and technology, the pipe bending technology has been widely applied to various production industries, and a pipe bending machine applying the pipe bending technology becomes an irreplaceable mechanical device in industrial production.

The bending machine that is common in the existing market mainly includes: the pipe bending machine comprises a frame, a pipe feeding trolley movably arranged on the frame, a machine head arranged at the front part of the frame, a main shaft of a belt wheel module vertically and movably supported in the machine head, a pipe bending arm fixedly sleeved on the main shaft, a clamping module arranged on the pipe bending arm and a driving device for driving the pipe bending arm to swing relative to the axis of the main shaft; wherein the clamping module is positioned at the outer side of the wheel module. In the pipe bending process of the pipe bending machine, the feeding trolley clamps the pipe and sends the front end of the clamped pipe into a die cavity between the clamping module and the wheel module, and the driving device drives the pipe bending arm to swing around the set direction of the pipe bending and simultaneously the feeding trolley continuously conveys the pipe forwards until the pipe bending operation is completed. However, the pipe bending arm with the structure is large in structure and limited by the swing space, the swing angle of the pipe bending arm can only reach 180 degrees at most, for a 9-shaped pipe bending piece with the structure shown in fig. 1, the swing angle of the pipe bending processing of the head bending part exceeds 180 degrees, so that a common pipe bending machine on the market cannot process the 9-shaped pipe bending piece, the processing of the 9-shaped pipe bending piece still adopts the traditional manual bending mode, but the manual bending mode has the defects of high labor intensity of workers, low working efficiency, poor product consistency and the like.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that needs to solve is: provides a 9-shaped pipe bender which has compact structure and convenient use and maintenance and can bend 9-shaped pipe bending parts.

In order to solve the above problem, the utility model adopts the following technical scheme: the 9-shaped pipe bender comprises: the pipe bending machine comprises a frame, a pipe feeding trolley movably arranged on the frame, a machine head arranged at the front part of the frame and a pipe bending arm, wherein a connecting sleeve is arranged at one end of the pipe bending arm; the main shaft is vertically supported at the front part of the machine head through a bearing group, the bottom end of the main shaft extends out of the lower part of the machine head and then is connected with a driving device, and the driving device drives the main shaft to rotate relative to the axis of the main shaft; the bent pipe arm is fixedly sleeved on the main shaft extending out of the upper part of the machine head through a connecting sleeve, and a lower wheel die and a main clamping frame are fixedly arranged on the bent pipe arm; the upper wheel die is arranged on the main clamping frame through the lifting device and is positioned above the lower wheel die, and the upper wheel die can move downwards through the lifting device to be matched with the lower wheel die to form a complete bent pipe die cavity for bending the 9-shaped bent pipe fitting. The lifting device and the upper wheel die are arranged on the main clamping frame above the lower wheel die in a centralized manner, so that the transverse occupied space of the bent pipe arm can be greatly reduced, the space below the bent pipe arm is completely not occupied, and the bent pipe arm is positioned on the upper part of the machine head, therefore, the swinging space of the bent pipe arm is basically not obstructed by other components on the rack, and the swinging angle of the bent pipe arm completely meets the swinging angle required by the head bending part for bending the 9-shaped bent pipe fitting.

In order to ensure that the upper wheel die can be well matched with the lower wheel die without deviation in the transverse position, the scheme is that a positioning block protruding downwards is arranged on the bottom surface of the upper wheel die, and a positioning hole for the positioning block to extend into is downwards formed in the top surface of the lower wheel die; when the upper wheel mold moves downwards through the lifting device to be matched with the lower wheel mold, the positioning block extends into the positioning hole to play a role in positioning the upper wheel mold.

Further, in the 9-shaped pipe bender, the specific structure of the lower wheel mold is as follows: a first lower wheel die body and a second lower wheel die body are upwards protruded on the top surface of the lower wheel die at intervals, and the outer contour of the first lower wheel die body is formed by sequentially connecting a quarter circular straight channel contour, a quarter circular channel contour which is in transition connection with the quarter circular straight channel contour and is outward-convex circular arc surrounding shape, a quarter circular transition channel contour which is in transition connection with the quarter circular channel contour which is outward-convex circular arc surrounding shape and is inward-convex arc-shaped, and a quarter circular auxiliary straight channel contour; at this time, the outer contour of the first lower wheel die body is similar to a b-shaped cylinder shape. The second lower wheel die body is positioned on the position of the opposite surface of the profile of the quarter-circular straight channel of the first lower wheel die body, and the inner side surface of the second lower wheel die body and the profile of the quarter-circular straight channel of the first lower wheel die body form a half-circular straight channel; the outer contour of the first lower wheel die body and the inner side surface of the second lower wheel die body form a lower die cavity of the lower half part of the head bending part of the bent 9-shaped pipe bending piece; after the head bending part of the 9-shaped elbow pipe is sleeved on the second lower wheel die body, the outer contour of the first lower wheel die body and the inner side surface of the second lower wheel die body form a lower die cavity for bending the lower half part of the middle bending part of the 9-shaped elbow pipe; the upper wheel die structure is as follows: a first upper wheel die body and a second upper wheel die body are projected downwards on the bottom surface of the upper wheel die at intervals, the outer contour of the first upper wheel die body and the outer contour of the first lower wheel die body are in mirror symmetry, and the outer contour of the second upper wheel die body and the outer contour of the second lower wheel die body are in mirror symmetry; the outer contour of the first upper wheel die body and the inner side face of the second upper wheel die body form an upper die cavity of the upper half part of the head bending part of the bent 9-shaped pipe bending piece; after the head bending part of the 9-shaped elbow pipe fitting is sleeved on the second upper wheel die body, the outer contour of the first upper wheel die body and the inner side surface of the second upper wheel die body form an upper die cavity for bending the upper half part of the middle bending part of the 9-shaped elbow pipe fitting.

Wherein, the locating piece sets up the bottom surface intermediate position at first upper wheel mould body usually, and the locating hole sets up the top surface intermediate position at first lower wheel mould body usually, makes the overall structure of upper wheel mould and lower wheel mould compacter small and exquisite like this.

The lifting device in the scheme adopts a main clamping oil cylinder, a cylinder body of the main clamping oil cylinder is fixedly arranged on a main clamping frame, an extension rod of the main clamping oil cylinder points downwards, and an upper wheel die is fixedly arranged at the bottom of the extension rod of the main clamping oil cylinder. The design makes the overall structure of elevating gear very succinct compact.

The driving device in the scheme adopts a servo motor, a servo reducer and a coupler, a motor shaft of the servo motor is fixedly connected with an input shaft of the servo reducer, and an output shaft of the servo reducer is fixedly connected with the bottom of a main shaft through the coupler. The driving device adopting the structure only occupies the space below the main shaft, the swing angle of the elbow arm can not be influenced completely, and in addition, the integral structure is more compact.

The 9-shaped elbow piece has various dimensions, so that the dimensions of the elbow die cavity formed by each pair of the upper wheel die and the lower wheel die also have various dimensions, and the height of the elbow die cavity needs to be adjusted aiming at the elbow die cavities with different dimensions, namely the upper position and the lower position of the machine head need to be adjusted, so that the position of the pipe conveyed in the pipe feeding trolley and the position of the elbow die cavity are positioned on the same level. Make the aircraft nose here install on the leading flank of frame through upper and lower displacement device, the cylinder body fixed mounting of retooling hydro-cylinder is in the frame of aircraft nose below, and the projecting rod of retooling hydro-cylinder points to the top, and the projecting rod and the aircraft nose bottom fixed connection of retooling hydro-cylinder. The extension rod of the die changing oil cylinder pushes the machine head to move upwards in the process of extending upwards to drive a die cavity of the bent pipe formed by the upper wheel die and the lower wheel die to move upwards; and in the process that the extension rod of the die changing oil cylinder retracts downwards, the drawing machine head moves downwards to drive the bent pipe die cavity formed by the upper wheel die and the lower wheel die to move downwards, so that the height position of the bent pipe die cavity is adjusted.

Further, aforementioned 9 font bending machine, wherein, install on the aircraft nose and assist and push away the die sleeve assembly, assist and push away the die sleeve assembly and include: the auxiliary pushing mounting seat is provided with an auxiliary pushing die sleeve through a front-back sliding device, a cylinder body of an auxiliary pushing oil cylinder is fixedly arranged on the auxiliary pushing mounting seat, an extension rod of the auxiliary pushing oil cylinder points to the front, and the extension rod of the auxiliary pushing oil cylinder is fixedly connected with the auxiliary pushing die sleeve; the front end of the pipe conveyed in the pipe feeding trolley passes through the auxiliary pushing die sleeve and then extends into the die cavity of the bent pipe. The driving device drives the elbow arm to swing around the elbow in the set direction, and the feeding trolley continuously conveys the pipe forwards until the elbow operation is completed; in the pipe bending process, the extension rod of the auxiliary pushing oil cylinder also extends forwards at a constant speed, so that the auxiliary pushing die sleeve pushes the pipe at a constant speed, and after the pipe bending operation is finished, the extension rod of the auxiliary pushing oil cylinder retracts backwards to the original position.

The beneficial effects of the utility model are that: the 9-shaped pipe bender has the advantages of compact structure, convenient use and maintenance and suitability for bending 9-shaped pipe bending parts.

Drawings

Fig. 1 is a schematic structural view of a 9-shaped pipe bending member.

Fig. 2 is a schematic structural view of a 9-shaped pipe bender according to the present invention.

Fig. 3 is a partially enlarged structural view of fig. 1.

Fig. 4 is a partially enlarged structural view in a top view of fig. 2.

Fig. 5 is a schematic structural view of the upper wheel mold in fig. 3.

Fig. 6 is a structural view in the bottom direction of fig. 5.

Fig. 7 is a schematic structural view of the lower wheel die in fig. 3.

Fig. 8 is a partial structural view in a top view in fig. 7.

Fig. 9 is a schematic view showing a state in which a pipe is bent in a lower die when a head bending portion of a 9-shaped pipe bending member is bent.

Fig. 10 is a schematic view showing a state in which a pipe is bent in a lower die while bending an intermediate bent portion of a 9-shaped pipe bending member.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments.

The structure of the 9-shaped elbow member 1 to be processed is shown in fig. 1, and the 9-shaped elbow member 1 needs to be subjected to two pipe bending processes: the tube bending of the head bending portion 11 and the tube bending of the intermediate bending portion 11. Wherein the bending angle of the head bending portion 11 is about two hundred and sixty degrees. The maximum pipe bending angle of the pipe bending machine on the market at present can only reach one hundred eighty degrees, and the pipe bending machine cannot be used for bending the 9-shaped pipe bending part 1. Therefore, the applicant has designed a 9-shaped pipe bender which has a bending arm swinging at an angle completely satisfying the swinging angle required for bending the head bending portion of the 9-shaped pipe bending part in view of the current situation.

A commercially available bending machine, comprising: the pipe bending machine comprises a frame 2, a pipe feeding trolley movably arranged on the frame 2, a machine head 21 arranged at the front part of the frame 2 and a pipe bending arm 3, wherein a connecting sleeve 31 is arranged at one end of the pipe bending arm 3. The 9-shaped pipe bender is improved and designed on the basis as follows: as shown in fig. 2 and fig. 3, the main shaft 22 is vertically supported at the front of the machine head 21 through a bearing set, and the bottom end of the main shaft 22 extends out of the lower part of the machine head 21 and then is connected with a driving device, and the main shaft 22 is driven by the driving device to rotate relative to the axis thereof. The elbow arm 3 is fixedly sleeved on the main shaft 22 extending out of the upper part of the machine head 21 through a connecting sleeve 31, and the lower wheel mold 4 and the main clamping frame 5 are fixedly arranged on the elbow arm 3. The upper wheel die 6 is arranged on the main clamping frame 5 through the lifting device, the upper wheel die 6 is positioned above the lower wheel die 4, and the upper wheel die 6 can move downwards through the lifting device to be matched with the lower wheel die 4 to form a complete bent pipe die cavity for bending the 9-shaped bent pipe fitting 1.

The lifting device and the upper wheel die 6 are arranged on the main clamping frame 5 above the lower wheel die 4 in a centralized manner, so that the transverse occupied space of the elbow arm 3 can be greatly reduced, the space below the elbow arm 3 is not occupied at all, and the elbow arm 3 is positioned on the upper part of the machine head 21, therefore, the swinging space of the elbow arm 3 is basically not obstructed by other components on the rack 2, and the swinging angle of the elbow arm 3 completely meets the swinging angle required by the head bending part 11 for bending the 9-shaped elbow pipe fitting 1. As shown in fig. 4, the swing angle α of the elbow arm 3 from the position a to the position B can be about two hundred and seventy degrees.

In order to ensure that the upper wheel die 6 can be well matched with the lower wheel die 4 without deviation at the transverse position, the scheme is provided with a positioning structure for guiding the upper wheel die 6 to be matched with the lower wheel die at a required position: as shown in fig. 5 and 7, a positioning block 61 protruding downward is provided on the bottom surface of the upper die 6, and a positioning hole 41 into which the positioning block 61 extends is provided downward on the top surface of the lower die 4. When the upper wheel die 6 moves downwards through the lifting device to be matched with the lower wheel die 4, the positioning block 61 extends into the positioning hole 41 to play a role in positioning the position of the upper wheel die 6, so that the transverse dislocation phenomenon of a bent pipe die cavity after die matching is avoided, and the bent pipe quality is further improved.

The lower wheel mold 4 has a lower mold cavity 40 adapted to bend the lower half of the head bending portion 11 and the lower half of the middle bending portion 11 of the 9-shaped elbow member 1 laid flat. As shown in fig. 7 and 8, the specific structure of the lower wheel mold 4 is as follows: a first lower wheel die body 42 and a second lower wheel die body 43 are protruded upwards at intervals on the top surface of the lower wheel die 4, the outer contour of the first lower wheel die body 42 is formed by sequentially connecting a quarter circular straight channel contour 421, a quarter circular channel contour 422 which is in transition connection with the quarter circular straight channel contour 421 and is outward convex in circular arc surrounding shape, a quarter circular transition channel contour 423 which is in transition connection with the quarter circular channel contour 422 which is outward convex in circular arc surrounding shape and is inward convex in arc shape, and a quarter circular auxiliary straight channel contour 424 to form a closed outer contour. At this time, the outer profile of the first lower die body 42 is shaped like a b-shaped cylinder. The second lower die body 43 is located at a position opposite to the quarter circular straight channel contour 421 of the first lower die body 42, and at this time, the inner side surface 431 of the second lower die body 43 faces the quarter circular straight channel contour 421 of the first lower die body 42. The inner side surface 431 of the second lower die body 43 is a quarter-circular straight channel profile which is mirror-symmetrical to the quarter-circular straight channel profile 421 of the first lower die body 42, and the inner side surface 431 of the second lower die body 43 and the quarter-circular straight channel profile 421 of the first lower die body 42 form a half-circular straight channel 44. The outer contour of the first lower die body 42 and the inner side surface 431 of the second lower die body 43 form a lower die cavity 40 for bending the lower half part of the head bending part 11 of the 9-shaped elbow pipe fitting 1; after the head bending part 11 of the 9-shaped pipe bending member 1 is fitted over the second lower die body 43, the outer contour of the first lower die body 42 and the inner side surface 431 of the second lower die body 43 form a lower die cavity 40 for bending the lower half of the middle bending part 12 of the 9-shaped pipe bending member 1.

The cavity of the upper wheel mold 6 is an upper mold cavity 60 adapted to bend the upper half of the head bending part 11 and the upper half of the middle bending part 11 of the 9-shaped pipe bending member 1 laid flat. As shown in fig. 5 and 6, the specific structure of the upper wheel die 6 is as follows: a first upper wheel die body 62 and a second upper wheel die body 63 are protruded downwards at intervals on the bottom surface of the upper wheel die 6, and the outer contour of the first upper wheel die body 62 and the outer contour of the first lower wheel die body 42 are in mirror symmetry and are also in a shape similar to a b-shaped cylinder. The outer contour of the second upper wheel die body 62 and the outer contour of the second lower wheel die body 42 are mirror images. The outer contour of the first upper die body 62 and the inner side surface 631 of the second upper die body 63 constitute an upper die cavity 60 for bending the upper half of the head bending part 11 of the 9-shaped elbow part 1; after the head bending part 11 of the 9-shaped elbow member 1 is sleeved on the second upper die body 63, the outer contour of the first upper die body 62 and the inner side 631 of the second upper die body 63 form an upper die cavity 60 for bending the upper half part of the middle bending part 12 of the 9-shaped elbow member 1.

Upper mold cavity 60 and lower mold cavity 40 are closed to form a complete elbow mold cavity. For convenience of description, the bending process of the tube material into the lower mold cavity 40 is described, and after the front end of the tube material is inserted into the inner side surface 431 of the second lower die body 43 and the quarter-circle straight channel profile 421 of the first lower die body 42 to form a half-circle straight channel 44, the bending arm swings and bends around the bending setting direction to obtain the head bending part 11 of the 9-shaped bent tube member 1, and the bent head bending part 11 is shown in fig. 9. Then, after the head bending part of the 9-shaped pipe bending part is sleeved on the second lower wheel die body 43, at this time, the outer contour of the first lower wheel die body 42 and the inner side surface 431 of the second lower wheel die body 43 form a lower die cavity 40 for bending the lower half part of the middle bending part 12 of the 9-shaped pipe bending part 1, the pipe bending arm swings and bends around the pipe bending setting direction to obtain the middle bending part 12 of the 9-shaped pipe bending part 1, and the bent middle bending part 12 is as shown in fig. 10.

Wherein, the positioning block 61 on the bottom surface of the upper wheel mold 6 is usually disposed at the middle position of the bottom surface of the first upper wheel mold body 62, and the positioning hole 41 on the top surface of the lower wheel mold 4 is usually disposed at the middle position of the top surface of the first lower wheel mold body 42, so that the lower wheel mold 4 and the upper wheel mold 6 are more compact.

The lifting device has various forms, the lifting device in the scheme adopts a main clamping oil cylinder 51, as shown in fig. 3, a cylinder body of the main clamping oil cylinder 51 is fixedly arranged on a main clamping frame 5, an extension rod of the main clamping oil cylinder 51 points downwards, and an upper wheel die 6 is fixedly arranged at the bottom of the extension rod of the main clamping oil cylinder 51. And the upper wheel die 6 is pushed to move downwards in the process that the extension rod of the main clamping oil cylinder 51 extends downwards until the upper wheel die 6 and the lower wheel die 4 are matched. The upper wheel die 6 is pulled to move upwards and away from the lower wheel die 4 in the process that the extension rod of the main clamping oil cylinder 51 retracts upwards. In order to improve the overall strength of the main clamping frame 5, a reinforcing rib structure can be arranged.

The driving device in the present embodiment adopts a servo motor 71, a servo reducer 72 and a coupler 73, as shown in fig. 2, a motor shaft of the servo motor 71 is fixedly connected with an input shaft of the servo reducer 72, and an output shaft of the servo reducer 72 is fixedly connected with the bottom of the main shaft 22 through the coupler 73. The driving device adopting the above structure only occupies the space below the main shaft 22, and does not limit the swing angle of the elbow arm 3 at all.

The 9-shaped elbow member 1 has various dimensions: such as a difference in outer tube diameter. Therefore, the size of each complete elbow combined die consisting of the upper wheel die 4 and the lower wheel die 6 has multiple specifications, and aiming at elbow combined dies with different specifications, the height of an elbow die cavity in the corresponding elbow combined die needs to be adjusted, namely the upper position and the lower position of the machine head 21 need to be adjusted, so that the position of a pipe conveyed in the pipe feeding trolley and the position of the elbow die cavity are positioned on the same level. As shown in fig. 2, the machine head 21 is mounted on the front side of the machine frame 2 through an up-down sliding device, the up-down sliding structure may adopt a common slide block guide rail structure on the market, a cylinder body of the die-changing cylinder 23 is fixedly mounted on the machine frame 2 below the machine head 21, an extending rod 231 of the die-changing cylinder 23 points upward, and the extending rod 231 of the die-changing cylinder 23 is fixedly connected with the bottom of the machine head 21. The extension rod 231 of the die changing oil cylinder 23 pushes the machine head 21 to move upwards in the process of extending upwards, and drives the bending die cavity formed by the upper wheel die 6 and the lower wheel die 4 to move upwards; the extension rod 231 of the die-changing oil cylinder 23 pulls the machine head 21 to move downwards in the process of retracting downwards, so as to drive the elbow die cavity formed by the upper wheel die 6 and the lower wheel die 4 to move downwards, thereby adjusting the height position of the elbow die cavity.

As shown in fig. 4, in the present scheme, an auxiliary pushing mold sleeve assembly is installed on the machine head 21, and the auxiliary pushing mold sleeve assembly includes: the auxiliary pushing mounting seat 81 is provided with a front pushing die sleeve 82 and a rear pushing die sleeve 82, the front and rear sliding devices are mounted on the auxiliary pushing mounting seat 81 through a front sliding device and a rear sliding device, the front and rear sliding structures can adopt a common slide block guide rail structure on the market, a cylinder body of the auxiliary pushing oil cylinder 83 is fixedly mounted on the auxiliary pushing mounting seat 81, an extension rod of the auxiliary pushing oil cylinder 83 points to the front, and the extension rod of the auxiliary pushing oil cylinder 83 is fixedly connected with the auxiliary pushing die sleeve 82. The front end of the pipe conveyed in the pipe feeding trolley passes through the auxiliary push die sleeve 82 and then extends into the die cavity of the bent pipe. The driving device drives the pipe bending arm 3 to swing around the set pipe bending direction, and the feeding trolley continuously conveys the pipes forwards until pipe bending operation is completed; in the pipe bending process, the extension rod of the auxiliary push oil cylinder 83 also extends forwards at a constant speed, so that the auxiliary push die sleeve 82 assists in pushing the pipe at a constant speed, and after the pipe bending process is finished, the extension rod of the auxiliary push oil cylinder 83 retracts backwards to the original position.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any modifications or equivalent changes made in accordance with the technical spirit of the present invention are also within the scope of the present invention.

Claims (8)

1.9 font bending machine includes: the pipe bending machine comprises a frame, a pipe feeding trolley movably arranged on the frame, a machine head arranged at the front part of the frame and a pipe bending arm, wherein a connecting sleeve is arranged at one end of the pipe bending arm; the method is characterized in that: the main shaft is vertically supported at the front part of the machine head through a bearing group, the bottom end of the main shaft extends out of the lower part of the machine head and then is connected with a driving device, and the driving device drives the main shaft to rotate relative to the axis of the main shaft; the bent pipe arm is fixedly sleeved on the main shaft extending out of the upper part of the machine head through a connecting sleeve, and a lower wheel die and a main clamping frame are fixedly arranged on the bent pipe arm; the upper wheel die is arranged on the main clamping frame through the lifting device and is positioned above the lower wheel die, and the upper wheel die can move downwards through the lifting device to be matched with the lower wheel die to form a complete bent pipe die cavity for bending the 9-shaped bent pipe fitting.

2. The figure-9 bender according to claim 1, wherein: a positioning block protruding downwards is arranged on the bottom surface of the upper wheel die, and a positioning hole for the positioning block to extend into is arranged downwards on the top surface of the lower wheel die; when the upper wheel die moves downwards through the lifting device and is matched with the lower wheel die, the positioning block extends into the positioning hole.

3. The figure-9 bender according to claim 1, wherein: the lower wheel mold structure is as follows: the top surface of the lower wheel die is upwards protruded with a first lower wheel die body and a second lower wheel die body at intervals, and the outer contour of the first lower wheel die body is formed by sequentially connecting a quarter circular straight channel contour, a quarter circular channel contour which is in transition connection with the quarter circular straight channel contour and is outward convex in circular arc surrounding shape, a quarter circular transition channel contour which is in transition connection with the quarter circular channel contour which is outward convex in circular arc surrounding shape and is inward convex in arc shape, and a quarter circular auxiliary straight channel contour; the second lower wheel die body is positioned at the position of the opposite surface of the profile of the quarter-circular straight channel of the first lower wheel die body, and the inner side surface of the second lower wheel die body and the profile of the quarter-circular straight channel of the first lower wheel die body form a half-circular straight channel; the outer contour of the first lower wheel die body and the inner side surface of the second lower wheel die body form a lower die cavity of the lower half part of the head bending part of the bent 9-shaped pipe bending piece; after the head bending part of the 9-shaped elbow pipe fitting is sleeved on the second lower wheel die body, the outer contour of the first lower wheel die body and the inner side surface of the second lower wheel die body form a lower die cavity for bending the lower half part of the middle bending part of the 9-shaped elbow pipe fitting; the upper wheel die structure is as follows: a first upper wheel die body and a second upper wheel die body are projected downwards on the bottom surface of the upper wheel die at intervals, the outer contour of the first upper wheel die body and the outer contour of the first lower wheel die body are in mirror symmetry, and the outer contour of the second upper wheel die body and the outer contour of the second lower wheel die body are in mirror symmetry; the outer contour of the first upper wheel die body and the inner side face of the second upper wheel die body form an upper die cavity of the upper half part of the head bending part for bending the 9-shaped pipe bending part; after the head bending part of the 9-shaped elbow pipe fitting is sleeved on the second upper wheel die body, the outer contour of the first upper wheel die body and the inner side surface of the second upper wheel die body form an upper die cavity for bending the upper half part of the middle bending part of the 9-shaped elbow pipe fitting.

4. The figure-9 bender according to claim 2, wherein: a positioning block protruding downwards is arranged in the middle of the bottom surface of the first upper wheel die body, and a positioning hole for the positioning block to extend into is formed downwards in the middle of the top surface of the first lower wheel die body; when the upper wheel die moves downwards through the lifting device and is matched with the lower wheel die, the positioning block extends into the positioning hole.

5. The 9-letter bender according to claim 1 or 2, wherein: the lifting device comprises: the main clamping oil cylinder is fixedly arranged on the main clamping frame, an extension rod of the main clamping oil cylinder points downwards, and the upper wheel die is fixedly arranged at the bottom of the extension rod of the main clamping oil cylinder.

6. The 9-font bender according to claims 1 or 2, wherein: the drive device includes: the servo motor comprises a servo motor, a servo reducer and a coupler, wherein a motor shaft of the servo motor is fixedly connected with an input shaft of the servo reducer, and an output shaft of the servo reducer is fixedly connected with the bottom of a main shaft through the coupler.

7. The figure-9 bender according to claim 1, wherein: the die changing device comprises a frame, a die changing oil cylinder, a machine head, an upper sliding device, a lower sliding device, a cylinder body, a stretching rod and a guide rail.

8. The 9-font bender according to claim 1, wherein: install on the aircraft nose and assist and push away the die sleeve assembly, assist and push away the die sleeve assembly and include: the auxiliary pushing mounting seat is provided with an auxiliary pushing die sleeve through a front-back sliding device, a cylinder body of an auxiliary pushing oil cylinder is fixedly arranged on the auxiliary pushing mounting seat, an extension rod of the auxiliary pushing oil cylinder points to the front, and the extension rod of the auxiliary pushing oil cylinder is fixedly connected with the auxiliary pushing die sleeve; the front end of the pipe conveyed in the pipe feeding trolley passes through the auxiliary pushing die sleeve and then extends into the die cavity of the elbow pipe.

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