Pipe bending machine for extra-long U-shaped bent pipe

Abstract

The utility model relates to the technical field of pipe bending machines, in particular to a pipe bending machine for an extra-long U-shaped bent pipe, which comprises a pipe pushing assembly, a pipe bending assembly and a die adjusting assembly, and the pipe pushing assembly comprises a support, a first rotary driving part, a transmission gear, a rack, a sliding plate and a pipe clamping assembly. The pipe bending assembly comprises an extension plate, first telescopic driving parts, a clamping block, a fixing block, a speed reducer and a fourth rotary driving part, the fixing block is provided with first positioning grooves corresponding to multiple pipes needing to be bent, the extension plate is connected with the fixing block, the first telescopic driving parts are installed on the extension plate, output shafts of the first telescopic driving parts are connected with the clamping block, and the clamping block is connected with the speed reducer. A plurality of second positioning grooves corresponding to the first positioning grooves are formed in the end, facing the fixing block, of the clamping block, the mold adjusting assembly comprises a worm and gear lifting machine, a rotating shaft and a positioning sleeve, and the pipe bending device has the advantages that the pipe bending forming position can be adjusted conveniently, the pipe bending device adapts to bending of different pipes, and the pipe bending position can be conveniently driven to move to different heights.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe bending machines, in particular to a pipe bending machine for extra-long U-shaped pipes. Background Art

[0002] The pipe bending machine is a device that processes pipes into bent pipes. It mostly uses a motor to drive the pipe processing mold to bend the pipe. It is mainly used for processing metal pipes. When bending longer pipes, only the pipe to be bent is manually moved to the bending point, which is inconvenient to position the bending point and has low bending accuracy. The clamping method using clamping claws is costly, and when bending, different pipes require different diameters of pipe molds for limiting, which is inconvenient to adjust the pipe bending point and has low adaptability. Utility Model Content

[0003] 1. Technical issues to be solved

[0004] In view of the deficiencies in the prior art, the utility model provides a pipe bending machine for extra-long U-shaped pipes, which is convenient for adjusting the bending forming part of the pipe, adapting to bending different pipes, and conveniently driving the bending part to move to different heights.

[0005] (II) Technical solution

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pipe bending machine for extra-long U-shaped pipes, comprising a pipe pushing assembly, a pipe bending assembly and a die adjustment assembly;

[0007] The push tube assembly comprises a bracket, a rotating driving part 1, a transmission gear, a rack, a sliding plate and a tube clamping assembly, wherein the rack is mounted on the bracket, the rotating driving part 1 is mounted on the sliding plate, the sliding plate can slide on the bracket, the rotating driving part 1 is connected to the sliding plate, the output shaft of the rotating driving part 1 is connected to the transmission gear, and the transmission gear is meshed with the rack;

[0008] The pipe bending assembly includes an extension plate, a telescopic driving part 1, a clamping block, a fixed block, a reducer and a rotating driving part 4, the fixed block is provided with a positioning groove 1 corresponding to a plurality of pipes to be bent, the extension plate is connected to the fixed block, a plurality of telescopic driving parts 1 are mounted on the extension plate, the output shaft of the telescopic driving part 1 is connected to the clamping block, a plurality of positioning grooves 2 corresponding to the positioning groove 1 are arranged on one end of the clamping block toward the fixed block, the reducer is mounted on the bracket, the rotating driving part 4 is connected to the reducer, and the output end of the rotating driving part 4 is transmission-connected to the input and output ends of the reducer;

[0009] The mold adjustment assembly includes a worm gear lift, a rotating shaft and a positioning sleeve. The worm gear lift is installed on a bracket. The output end of the worm gear lift is connected to the positioning sleeve, the positioning sleeve is rotatably connected to the rotating shaft, the output end of the reducer is connected to the rotating shaft, the rotating shaft is connected to a fixed block, the rotating shaft is transmission-connected to the output shaft of the reducer, and the rotating shaft and the output shaft of the reducer can move relative to each other.

[0010] Preferably, the tube clamping assembly includes an adapter box, a second rotating drive unit, a gear one, a gear two, a positioning tube, a turntable, a clamping claw and a cam shaft, the adapter box is connected to the sliding plate, the rotating drive unit two is installed on the adapter box, the adapter box is connected to the positioning tube, the turntable is rotatably connected to the positioning tube, the clamping claw has a T-shaped strip-like cross-section, a plurality of clamping claws are provided on the positioning tube, a T-shaped hole corresponding to the clamping claw is provided on the positioning tube, the turntable is connected to the second gear, the output shaft of the second rotating drive unit is connected to the first gear, the first gear is meshed with the second gear, each clamping claw is connected to a cam shaft, the turntable is provided with an arc-shaped guide hole corresponding to the cam shaft, and the cam shaft is at different distances from the center axis of the turntable.

[0011] Preferably, it also includes a pipe limiting assembly, which includes a support box, a rotating drive unit three, a transmission shaft, a baffle, an adapter plate, a telescopic drive unit two and a frame plate. The support box is connected to the bracket, and the rotating drive unit three is installed on the support box. The output shaft of the rotating drive unit three is connected to the transmission shaft, and the transmission shaft is connected to the adapter plate for transmission. The rotation of the transmission shaft can drive the adapter plate to move. The adapter plate is connected to the baffle, and a limiting groove corresponding to the pipe to be bent is provided on the baffle. The frame plate is connected to the bracket, and the telescopic drive unit two is installed on the frame plate, and the output shaft of the telescopic drive unit two is connected to the support box.

[0012] Preferably, the push tube assembly further comprises a slider and a guide rail, a plurality of guide rails are mounted on the bracket, the slider and the guide rails are slidably connected, and the slider and the sliding plate are connected.

[0013] Preferably, the tube limiting assembly further includes an optical axis, a plurality of optical axes are fixedly connected to the support box, the optical axis passes through the adapter plate, and the optical axis and the transmission shaft are arranged in parallel.

[0014] Preferably, the bending pipe assembly also includes a guide shaft, and a plurality of guide shafts are connected to the clamping block, and the guide shafts pass through the extension plate.

[0015] Preferably, the first positioning groove and the second positioning groove are both in the shape of semicircular grooves, and each positioning groove has a different radius specification.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the utility model provides a pipe bending machine for extra-long U-shaped pipe bending, which has the following beneficial effects:

[0018] The pipe bending machine for the extra-long U-shaped pipe has a rotating driving part that drives the transmission gear to rotate, and the transmission gear and the rack are meshed, thereby effectively driving the sliding plate and the pipe clamping assembly to move, so that the pipe clamping assembly drives the pipe to move to the position where the pipe needs to be bent, and the output shaft of the telescopic driving part is extended, thereby driving the clamping block and the fixed block to cooperate, so that the clamping block and the fixed block clamp the pipe to be bent, so that the rotating driving part drives the output end of the reducer to rotate, and the reducer drives the telescopic driving part and the fixed block to rotate, and a plurality of positioning grooves are arranged on the clamping block, and the positioning sleeve and the rotating shaft are driven to rise and fall by the worm gear lifter, so as to adjust the position of the rotating shaft and the fixed block, so that different positioning grooves are used for bending, and the positioning groove is conveniently adjusted to adapt to the bending of different pipes, and the setting of the worm gear lifter can conveniently drive the pipe bending position to move to different heights. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the main structure of the utility model;

[0021] Figure 3 For this utility model Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle;

[0022] Figure 4 For this utility model Figure 3 A schematic diagram of the local enlarged structure at point A in the middle;

[0023] Figure 5 It is a left-side structural schematic diagram of the utility model;

[0024] Figure 6 For this utility model Figure 5 A schematic diagram of the local enlarged structure at point A in the middle;

[0025] Figure 7 It is a three-dimensional structural schematic diagram of the utility model;

[0026] Figure 8 For this utility model Figure 7 A schematic diagram of the local enlarged structure at point A in the middle;

[0027] Fig. 9 It is a three-dimensional structural schematic diagram of the utility model;

[0028] Fig.10 For this utility model Fig. 9 Schematic diagram of the local enlarged structure at point A in the middle.

[0029] Markings in the accompanying drawings: 1. bracket; 2. rotation drive unit 1; 3. transmission gear; 4. rack; 5. sliding plate; 6. adapter box; 7. rotation drive unit 2; 8. gear 1; 9. gear 2; 10. positioning tube; 11. turntable; 12. clamping claw; 13. cam shaft; 14. support box; 15. rotation drive unit 3; 16. transmission shaft; 17. baffle; 18. adapter plate; 19. telescopic drive unit 2; 20. frame plate; 21. extension plate; 22. telescopic drive unit 1; 23. clamping block; 24. fixing block; 25. guide shaft; 26. reducer; 27. rotation drive unit 4; 28. worm gear lift; 29. ​​rotating shaft; 30. positioning sleeve; 31. slider; 32. guide rail; 33. optical axis. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] Example:

[0032] See also Figure 1-10 A pipe bending machine for extra-long U-shaped pipes comprises a pipe pushing assembly, a pipe bending assembly and a die adjusting assembly.

[0033] The tube pushing assembly includes a bracket 1, a rotating driving part 2, a transmission gear 3, a rack 4, a sliding plate 5 and a tube clamping assembly. The rack 4 is installed on the bracket 1, the rotating driving part 2 is installed on the sliding plate 5, the sliding plate 5 can slide on the bracket 1, the rotating driving part 2 and the sliding plate 5 are connected, the output shaft of the rotating driving part 2 is connected to the transmission gear 3, and the transmission gear 3 and the rack 4 are meshed.

[0034] The pipe bending assembly includes an extension plate 21, a telescopic driving part 22, a clamping block 23, a fixed block 24, a reducer 26 and a rotating driving part 27. The fixed block 24 is provided with a positioning groove 1 corresponding to multiple pipes to be bent. The extension plate 21 is connected to the fixed block 24. A plurality of telescopic driving parts 22 are installed on the extension plate 21. The output shaft of the telescopic driving part 22 is connected to the clamping block 23. The clamping block 23 is provided with a plurality of positioning grooves 2 corresponding to the positioning groove 1 at one end facing the fixed block 24. The reducer 26 is installed on the bracket 1. The rotating driving part 27 is connected to the reducer 26. The output end of the rotating driving part 27 is connected to the input and output ends of the reducer 26.

[0035] The mold adjustment assembly includes a worm gear lift 28, a rotating shaft 29 and a positioning sleeve 30. The worm gear lift 28 is installed on the bracket 1. The output end of the worm gear lift 28 is connected to the positioning sleeve 30. The positioning sleeve 30 is rotatably connected to the rotating shaft 29. The output end of the reducer 26 is connected to the rotating shaft 29. The rotating shaft 29 is connected to the fixed block 24. The rotating shaft 29 is connected to the output shaft of the reducer 26. The rotating shaft 29 and the output shaft of the reducer 26 can move relatively. The rotating shaft 29 and the reducer 26 are connected by a key. The rotary drive part 2 and the transmission gear 3 are preferably connected by a key or The output end of the rotary drive unit 27 and the input and output ends of the reducer 26 are preferably connected by a key. The connection between the transmission shaft 16 and the adapter plate 18 is preferably a threaded connection, or a ball screw nut is installed on the adapter plate 18 and the transmission shaft 16 is selected as a ball screw. The telescopic drive unit 2 19 and the telescopic drive unit 1 22 are preferably one of a cylinder, a hydraulic cylinder and an electric cylinder. The rotary drive unit 27 is preferably a servo motor. The input end of the worm gear elevator 28 is preferably installed with a motor drive, or a hand wheel is installed, or the worm gear elevator 28 is rotated with a wrench. The input shaft of the worm gear lift 28 is used to provide power for the movement of the worm gear lift 28. The rotating shaft 29 is provided with a long key that matches the output of the reducer 26. The rotating shaft 29 and the positioning sleeve 30 are preferably connected by bearings. The fixed block 24 is provided with a rounded corner at one end toward the push tube assembly. The transmission gear 3 is driven to rotate by the rotating drive part 2. The transmission gear 3 and the rack 4 are engaged, thereby effectively driving the sliding plate 5 and the clamping tube assembly to move, so that the clamping tube assembly drives the tube to move to the place where it needs to be bent, and the output shaft of the telescopic drive part 22 is extended, thereby driving the clamping block 23 and the fixed block 24 to cooperate, so that the clamping The block 23 and the fixed block 24 clamp the pipe to be bent, so that the rotating drive part 27 drives the output end of the reducer 26 to rotate, and the reducer 26 drives the telescopic drive part 2 19 and the fixed block 24 to rotate, and a plurality of positioning grooves 1 are set on the clamping block 23, and the positioning sleeve 30 and the rotating shaft 29 are driven to rise and fall by the worm gear lift 28, so as to adjust the position of the rotating shaft 29 and the fixed block 24, so that different positioning grooves 1 are used for bending, and the positioning grooves are conveniently adjusted to adapt to the bending of different pipes, and the setting of the worm gear lift 28 can conveniently drive the bending pipe to move to different heights.

[0036] Reference Figure 1 , 5The clamping tube assembly includes a transfer box 6, a rotary drive unit 27, a gear 18, a gear 29, a positioning tube 10, a turntable 11, a clamping claw 12 and a convex shaft 13. The transfer box 6 is connected to the sliding plate 5. The rotary drive unit 27 is installed on the transfer box 6. The transfer box 6 is connected to the positioning tube 10. The turntable 11 is rotatably connected to the positioning tube 10. The clamping claw 12 has a T-shaped strip cross section. The positioning tube 10 is provided with a plurality of clamping claws 12. The positioning tube 10 is provided with a T-shaped hole corresponding to the clamping claw 12. The turntable 11 is connected to the gear 29. The output shaft of the rotary drive unit 27 is connected to the gear 18. The gear 18 is meshed with the gear 29. Each clamping claw 12 is connected to a convex shaft 13. The turntable 1 1 is provided with an arc-shaped guide hole corresponding to the convex shaft 13. The convex shaft 13 is at different distances from the central axis of the turntable 11. The rotating drive part 27, the gear 18 and then the gear 29 are supported by the adapter box 6. The rotating drive part 27 drives the gear 18 to rotate, and the gear 18 and the gear 29 cooperate to drive the gear 29 and the turntable 11 to rotate. The guide hole on the turntable 11 and the convex shaft 13 on the clamping jaw 12 cooperate to effectively drive the clamping jaw 12 to move toward the middle of the turntable 11, so that the clamping jaw 12 can clamp the pipe to be processed. The way in which the turntable 11 drives the clamping jaw 12 and the convex shaft 13 to move can effectively drive multiple clamping jaws 12 to move to the clamping position at the same time, thereby facilitating clamping and positioning.

[0037] Reference Figure 7 and 9 The pipe bending machine also includes a pipe limiting assembly, which includes a support box 14, a rotating drive unit 3 15, a transmission shaft 16, a baffle 17, an adapter plate 18, a telescopic drive unit 2 19 and a frame plate 20. The support box 14 is connected to the bracket 1, and a rotating drive unit 3 15 is installed on the support box 14. The output shaft of the rotating drive unit 3 15 is connected to the transmission shaft 16, and the transmission shaft 16 is connected to the adapter plate 18 for transmission. The rotation of the transmission shaft 16 can drive the adapter plate 18 to move. The adapter plate 18 is connected to the baffle 17, and the baffle 17 is provided with a limiting groove corresponding to the pipe to be bent. The frame plate 20 is connected to the support On the frame 1, a telescopic driving part 2 19 is installed on the frame plate 20, the output shaft of the telescopic driving part 2 19 is connected to the support box 14, a guide rail A is installed on the bracket 1, a slider A is slidably set on the guide rail A, the slider A is connected to the support box 14, and the rotation driving part 3 15 and the transmission shaft 16 are supported by the support box 14. The rotation driving part 3 15 drives the transmission shaft 16 to rotate, and the transmission shaft 16 cooperates with the adapter plate 18, thereby driving the adapter plate 18 and the baffle 17 to rise and fall to the appropriate position, so that the limiting grooves of different limiting tubes on the baffle 17 cooperate with the bent tube to limit the position of the tube to be bent.

[0038] Reference Figure 6The push tube assembly also includes a slider 31 and a guide rail 32. Several guide rails 32 are installed on the bracket 1. The slider 31 and the guide rail 32 are slidably connected. The slider 31 is connected to the sliding plate 5. By sliding on the slider 31 and the guide rail 32, the sliding plate 5 can be effectively guided to move to a certain position, thereby realizing the sliding of the sliding plate 5 on the bracket 1 and reducing the position deviation of the sliding plate 5.

[0039] Reference Figure 7 The tube limit assembly also includes an optical axis 33. A plurality of optical axes 33 are fixedly connected to the support box 14. The optical axis 33 passes through the adapter plate 18. The optical axis 33 and the transmission shaft 16 are arranged in parallel. A shaft sleeve matching the optical axis 33 is installed on the adapter plate 18. The moving position of the adapter plate 18 is limited by the optical axis 33, which effectively guides the adapter plate 18 and reduces the position deviation of the adapter plate 18.

[0040] Reference Figure 7 The bending pipe assembly also includes a guide shaft 25, and a plurality of guide shafts 25 are connected to the clamping block 23. The guide shaft 25 passes through the extension plate 21, and a guide sleeve that matches the guide shaft 25 is provided on the extension plate 21. Through the cooperation between the guide shaft 25 and the extension plate 21, the clamping block 23 is effectively guided to reduce the position deviation of the clamping block 23.

[0041] As one of the application forms, the positioning groove one and the positioning groove two are both semicircular grooves, and each positioning groove one has a different radius specification. The different radius specifications are determined according to the outer diameter of the tube to be bent. For example, a round tube between 10-30mm can preferably be 1mm larger than the outer diameter of the tube to be bent. By coordinating the positioning grooves one and two with different radius specifications, it can effectively adapt to the bending effects of different tubes and further improve the adaptability.

[0042] When in use, the input shaft of the worm gear lift 28 is rotated, and the worm gear lift 28 drives the rotating shaft 29 and the positioning sleeve 30 to rise and fall, and the position of the fixed block 24 is adjusted to move the positioning groove 1 at the bending position of different pipes to the bending pipe, and the pipe is passed through the positioning pipe 10, so that the rotating drive part 27 drives the gear 18 to rotate, and the gear 18 cooperates with the gear 29, and then drives the gear 29 and the turntable 11 to rotate, and the guide hole on the turntable 11 cooperates with the convex shaft 13 to drive the clamping claw 12 to clamp the pipe to be bent, and the rotating drive part 2 is started, and the rotating drive part 2 drives the transmission The gear 3 rotates, and the transmission gear 3 and the rack 4 cooperate to drive the sliding plate 5 and the tube to be bent to move, so that the bending point moves to a positioning groove, so that the output shaft of the telescopic drive unit 2 19 extends, and the telescopic drive unit 2 19 drives the baffle 17 to limit the position of the tube to be bent. The output shaft of the telescopic drive unit 1 22 extends to drive the positioning groove 1 on the clamping block 23 and the positioning groove 2 on the fixed block 24 to cooperate to limit the position of the tube to be bent, and the rotary drive unit 4 27 drives the input shaft of the reducer 26 to rotate, and the rotary drive unit 4 27 drives the fixed block 24 to rotate, thereby driving the pipeline to bend.

[0043] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0044] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0045] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0046] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A pipe bending machine for extra-long U-shaped pipes, characterized in that: It includes a tube pushing assembly, a tube bending assembly and a mold adjustment assembly; The tube push assembly comprises a bracket (1), a rotary drive unit (2), a transmission gear (3), a rack (4), a sliding plate (5) and a tube clamping assembly, wherein the rack (4) is mounted on the bracket (1), the rotary drive unit (2) is mounted on the sliding plate (5), the sliding plate (5) can slide on the bracket (1), the rotary drive unit (2) and the sliding plate (5) are connected, the output shaft of the rotary drive unit (2) is connected to the transmission gear (3), and the transmission gear (3) and the rack (4) are meshed; The pipe bending assembly comprises an extension plate (21), a telescopic driving part (22), a clamping block (23), a fixed block (24), a speed reducer (26) and a rotating driving part (27); the fixed block (24) is provided with a positioning groove (1) corresponding to a plurality of pipes to be bent; the extension plate (21) is connected to the fixed block (24); a plurality of telescopic driving parts (22) are mounted on the extension plate (21); an output shaft of the telescopic driving part (22) is connected to the clamping block (23); a plurality of positioning grooves (2) corresponding to the positioning groove (1) are provided at one end of the clamping block (23) facing the fixed block (24); the speed reducer (26) is mounted on the bracket (1); the rotating driving part (27) is connected to the speed reducer (26); and the output end of the rotating driving part (27) is transmission-connected to the input and output ends of the speed reducer (26); The mold adjustment component comprises a worm gear lift (28), a rotating shaft (29) and a positioning sleeve (30); the worm gear lift (28) is mounted on the bracket (1); the output end of the worm gear lift (28) is connected to the positioning sleeve (30); the positioning sleeve (30) is rotationally connected to the rotating shaft (29); the output end of the reducer (26) is connected to the rotating shaft (29); the rotating shaft (29) is connected to the fixed block (24); the rotating shaft (29) is transmission-connected to the output shaft of the reducer (26); and the rotating shaft (29) and the output shaft of the reducer (26) are relatively movable.

2. The pipe bending machine for extra-long U-shaped pipes according to claim 1, characterized in that: The pipe clamping assembly comprises a transfer box (6), a second rotary drive unit (7), a gear one (8), a second gear (9), a positioning tube (10), a rotating disk (11), a clamping claw (12) and a convex shaft (13); the transfer box (6) is connected to the sliding plate (5); the second rotary drive unit (7) is installed on the transfer box (6); the transfer box (6) is connected to the positioning tube (10); the rotating disk (11) is rotatably connected to the positioning tube (10); the clamping claw (12) is in the shape of a T-shaped strip in cross section; the positioning tube (10) is A plurality of clamping jaws (12) are provided, a T-shaped hole corresponding to the clamping jaws (12) is provided on the positioning tube (10), a turntable (11) is connected to a second gear (9), an output shaft of a second rotating driving part (7) is connected to a first gear (8), the first gear (8) and the second gear (9) are meshed, each clamping jaw (12) is connected to a convex shaft (13), an arc-shaped guide hole corresponding to the convex shaft (13) is provided on the turntable (11), and the distances between the convex shaft (13) and the central axis of the turntable (11) are different at different locations.

3. The pipe bending machine for extra-long U-shaped pipes according to claim 1, characterized in that: The invention also comprises a pipe limiting assembly, wherein the pipe limiting assembly comprises a support box (14), a rotating drive unit three (15), a transmission shaft (16), a baffle (17), an adapter plate (18), a telescopic drive unit two (19) and a frame plate (20). The support box (14) is connected to the support (1), the rotating drive unit three (15) is installed on the support box (14), the output shaft of the rotating drive unit three (15) is connected to the transmission shaft (16), the transmission shaft (16) and the adapter plate (18) are in transmission connection, the transmission shaft (16) can drive the adapter plate (18) to move when the transmission shaft (16) rotates, the adapter plate (18) is connected to the baffle (17), a limiting groove corresponding to the pipe to be bent is arranged on the baffle (17), the frame plate (20) is connected to the support (1), the telescopic drive unit two (19) is installed on the frame plate (20), and the output shaft of the telescopic drive unit two (19) is connected to the support box (14).

4. The pipe bending machine for extra-long U-shaped pipes according to claim 1, characterized in that: The push tube assembly further comprises a slider (31) and a guide rail (32). The plurality of guide rails (32) are mounted on the bracket (1). The slider (31) and the guide rail (32) are slidably connected. The slider (31) and the sliding plate (5) are connected.

5. The pipe bending machine for extra-long U-shaped pipes according to claim 3, characterized in that: The tube limiting assembly also includes an optical axis (33). A plurality of optical axes (33) are fixedly connected to the support box (14). The optical axis (33) passes through the adapter plate (18). The optical axis (33) and the transmission shaft (16) are arranged in parallel.

6. The pipe bender for extra-long U-shaped pipes according to claim 3, characterized in that: The elbow assembly also includes a guide shaft (25). The clamping block (23) is connected to a plurality of guide shafts (25), and the guide shafts (25) pass through the extension plate (21).

7. The pipe bending machine for extra-long U-shaped pipes according to claim 1, characterized in that: The first positioning groove and the second positioning groove are both in the shape of semicircular grooves, and each positioning groove has a different radius specification.

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