Three-station special-shaped pipe bending machine

Abstract

The invention discloses a three-station special-shaped pipe bending machine, and relates to the technical field of pipe bending. The pipe bending device comprises a pipe bending base and a conveying motor fixedly connected to the top of the pipe bending base, the output end of the conveying motor is fixedly connected with a conveying roller, the top, close to the conveying motor, of the pipe bending base is fixedly connected with a fixing plate, and one side of the fixing plate is connected with a fixing roller through a bolt; the top, close to the fixing plate, of the pipe bending base is fixedly connected with a bending base, the top of the bending base is slidably connected with a bending roller, and the flexible supporting plate can be kept to be attached to the interior of the special-shaped pipe, so that it is guaranteed that the supporting structure is filled in the special-shaped pipe to support the inner wall of the special-shaped pipe, and the inner space of the special-shaped pipe is filled with the supporting structure; the unbalanced effect of the outer side tensile stress and the inner side compression stress is offset, the problems that the special-shaped pipe is wrinkled and sunken, the ovality exceeds the standard and the like are solved, and meanwhile the phenomenon that the section is distorted due to uneven stress can be prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of bent pipes, and more particularly to a three-station special-shaped pipe bender. Background Art

[0002] A three-station special-shaped pipe bender is an automated device specifically used for processing metal pipes with complex shapes. Its core feature is the collaborative work of three stations, which can efficiently complete the bending and forming of special-shaped pipes. The core function of the special-shaped pipe bender is to bend metal pipes into complex three-dimensional shapes to meet the customized needs of different industries. Its functions are not limited to simple pipe bending, but also include high-precision control, multi-angle composite bending, automated production, etc.

[0003] According to the Chinese Patent Network, the publication number "CN109127805B" is "A special-shaped pipe bender for air conditioners and its operation method", which includes a number of first progressive pipe bending components, second progressive pipe bending components, and pipe support components arranged in parallel at intervals. The first progressive pipe bending components and the second progressive pipe bending components are both arranged on a fixed frame. The first progressive pipe bending components and the second progressive pipe bending components are equipped with pressure sensors, ultrasonic flaw detectors, and laser three-dimensional scanners. The pressure sensors, ultrasonic flaw detectors, and laser three-dimensional scanners are connected to a central processor, and its operation method is also disclosed. The special-shaped pipe bender for air conditioners of the present invention can greatly improve the bending accuracy of special-shaped pipe fittings by using the first progressive pipe bending components, the second progressive pipe bending components, and the pipe support components to perform stretch bending on the pipe fittings, enabling the product to have more special-shaped shapes.

[0004] Although the above patent can improve the bending accuracy of special-shaped pipe fittings, when bending special-shaped pipes, the internal bending part of the special-shaped pipe will cause uneven tensile stress on the outer side and compressive stress on the inner side due to bending, resulting in problems such as wrinkles and depressions on the inner wall of the special-shaped pipe, which affects the bending quality of the special-shaped pipe. Summary of the Invention

[0005] The purpose of the present invention is to provide a three-station special-shaped pipe bender to solve the problems that the internal bending part of the special-shaped pipe will cause uneven tensile stress on the outer side and compressive stress on the inner side due to bending, resulting in problems such as wrinkles and depressions on the inner wall of the special-shaped pipe.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A three-station special-shaped pipe bender, including: A bent pipe base and a conveying motor fixedly connected to the top of the bent pipe base. The output end of the conveying motor is fixedly connected with a conveying roller. A fixed plate is fixedly connected to the top of the bent pipe base near the conveying motor. One side of the fixed plate is bolted with a fixed roller. A bending base is fixedly connected to the top of the bent pipe base near the fixed plate. A bending roller is slidably connected to the top of the bending base. A special-shaped pipe is slidably connected to one side of the bending roller. One side of the fixed plate is fixedly connected with a connecting plate. An installation mechanism and a support mechanism are arranged on one side of the connecting plate. A synchronization mechanism and a recovery mechanism are arranged inside the special-shaped pipe.

[0007] As a further scheme of the present invention: The installation mechanism includes a hydraulic base fixedly connected to one side of the connecting plate, and a hydraulic cylinder is fixedly connected to the top of the hydraulic base. The output end of the hydraulic cylinder is fixedly connected with a connecting disk, and four steel wire ropes are fixedly connected to one side of the connecting disk.

[0008] As a further scheme of the present invention: The installation mechanism further includes multiple groups of flexible support plates slidably connected to the outer wall of the steel wire rope. The inner sides of each group of flexible support plates are respectively fixedly connected with sliding support plates. Sliding plates are respectively fixedly connected to both sides of the sliding support plate. A sliding limit plate is fixedly connected to the other side of the sliding plate. An installation plate is slidably connected to the outer wall of the sliding support plate. Chain plates are fixedly connected to both sides of the installation plate. Each two chain plates are rotatably connected by a chain rod. The other end of the chain plate is rotatably connected to a core plate by a chain rod. And the core plate is fixedly connected to the inner side of the connecting plate.

[0009] As a further scheme of the present invention: The support mechanism includes two pads symmetrically installed on the inner side of the flexible support plate. Sliding tubes are symmetrically installed on the other side of one of the pads. Sliding rods are symmetrically installed on the other side of the other pad. And the outer wall of the sliding rod is slidably connected to the inner wall of the sliding tube.

[0010] As a further scheme of the present invention: The support mechanism further includes a support frame fixedly connected to the inner side of the sliding support plate. Two limiting rods are symmetrically installed on one side of the support frame. A return spring rod is fixedly connected to the inner side of the installation plate. And one end of the return spring rod penetrates through the support frame and extends to the inner side of the sliding support plate. A return spring is arranged on the outer wall of the return spring rod. And the return spring is installed between the support frame and the installation plate.

[0011] As a further scheme of the present invention: The synchronization mechanism includes a synchronization connecting rope fixedly connected to one side of the steel wire rope. The other end of the synchronization connecting rope is fixedly connected with a synchronization sliding plate. A synchronization limiting plate is fixedly connected to the top of the synchronization sliding plate. A recovery spring is installed between the synchronization sliding plate and the installation plate.

[0012] As a further solution of the present invention: The synchronization mechanism further includes two synchronization grooves symmetrically opened on one side of the flexible support plate and matching with the synchronization connection ropes. The two synchronization grooves arranged on one side are arranged one above the other, and a pulley is rotatably connected inside the synchronization groove close to the synchronization connection rope.

[0013] As a further solution of the present invention: The recovery mechanism includes a recovery inclined plate slidably connected to the outer wall of the front end of the steel wire rope, and a recovery seat is fixedly connected to one side of the recovery inclined plate. A recovery connection seat is fixedly connected to one side of the recovery seat, and the other side of the recovery connection seat is rotatably connected to a chain plate through a link rod.

[0014] As a further solution of the present invention: The recovery mechanism further includes a recovery motor fixedly connected inside the recovery connection seat, and a recovery threaded rod is fixedly connected to the output end of the recovery motor. A recovery threaded tube is threadedly connected to the outer wall of the recovery threaded rod, and a recovery moving rod is fixedly connected to one end of the recovery threaded tube. Recovery rollers are fixedly connected to both ends of the recovery moving rod, and a recovery pulling rope is slidably connected to the outer wall of the recovery roller. Both ends of the recovery pulling rope are respectively fixedly connected to the other ends of the two steel wire ropes, and a recovery groove matching with the recovery moving rod is arranged inside the recovery seat.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. Through the provided installation mechanism, the flexible support plate is made of flexible material and can undergo slight deformation as the special-shaped pipe bends. Multiple flexible support plates are arranged inside the bending part of the special-shaped pipe. When the bending roller bends the special-shaped pipe, the bending part will cause the flexible support plate to move linearly inward. The linearly moving flexible support plate drives the sliding support plate to move linearly inside the mounting plate. The linear movement of the sliding support plate can keep the flexible support plate in contact with the inside of the special-shaped pipe through the elastic action of the return spring, so as to ensure that the inside of the special-shaped pipe is filled to support the inner wall of the special-shaped pipe. The support structure offsets the unbalanced action of the outer tensile stress and the inner compressive stress by filling the internal space of the special-shaped pipe, avoiding problems such as wrinkles, depressions, and excessive ovality of the special-shaped pipe, and at the same time preventing the cross-section from being distorted due to uneven stress. 2. Through the provided steel wire rope and hydraulic cylinder, before installing the special-shaped pipe, start the hydraulic cylinder. The hydraulic cylinder can drive the connection plate to move linearly. The linearly moving connection plate drives the steel wire rope to move linearly. After the steel wire rope moves linearly and is straightened, it can drive the flexible support plates to line up, thus facilitating the special-shaped pipe to be sleeved into the support mechanism and avoiding increasing the installation time of the special-shaped pipe due to deflection between the flexible support plates. 3. Through the provided support mechanism, when the flexible support plate deforms, the deformed flexible support plate can drive the wire rope to move linearly towards the recovery inclined plate. The linearly moving wire rope drives the synchronous connection rope to move linearly. The linearly moving synchronous connection rope drives the synchronous sliding plate to move linearly through a pulley. The linearly moving synchronous sliding plate drives the synchronous limiting plate to move linearly. The linear movement of the synchronous limiting plate can limit the movement distance of the linearly moving sliding support plate, enabling the movement distance of the sliding support plate to change with the bending angle of the special-shaped pipe, thereby continuously ensuring the support of the flexible support plate for the inner wall of the special-shaped pipe. 4. Through the provided recovery mechanism, after the bending is completed, the recovery motor rotates to drive the recovery threaded rod to rotate. The rotating recovery threaded rod drives the recovery threaded pipe to move linearly through the threaded action and the limiting action of the recovery moving rod. The linearly moving recovery threaded pipe drives the recovery moving rod to move linearly. The linearly moving recovery moving rod drives the recovery roller to move linearly. The linearly moving recovery roller drives the wire rope to move linearly through the recovery pull rope, thereby relaxing the tension of the wire rope on the synchronous connection rope. At this time, under the elastic action of the recovery spring, the synchronous sliding plate can be driven to reset and the synchronous limiting plate can be driven to release the limitation on the sliding support plate, so that the flexible support plate does not need to fit on the inner wall of the special-shaped pipe, ultimately avoiding damage to the special-shaped pipe caused by the flexible support plate and improving the bending quality of the special-shaped pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the internal structural cross-sectional view of the special-shaped pipe of the present invention; Figure 3 is the internal structural schematic diagram of the special-shaped pipe of the present invention; Figure 4 is the structural schematic diagram of the support structure of the present invention; Figure 5 is the partial structural schematic diagram of the installation mechanism of the present invention; Figure 6 is the structural cross-sectional view of the support mechanism of the present invention; Figure 7 of the present invention Figure 6 is the enlarged view of the structure at A in; Figure 8 is the partial structural cross-sectional view of the synchronous mechanism of the present invention; Figure 9 is the partial structural schematic diagram of the support mechanism of the present invention; Figure 10 is the structural cross-sectional view of the recovery mechanism of the present invention; Figure 11 is the structural schematic diagram of the deformed support mechanism of the present invention.

[0017] In the figure: 1, elbow base; 2, conveying motor; 3, fixing plate; 4, bending base; 5, special-shaped pipe; 6, hydraulic base; 7, hydraulic cylinder; 8, connecting plate; 9, connecting disk; 10, steel wire rope; 11, flexible support plate; 12, backing plate; 13, sliding pipe; 14, sliding rod; 15, sliding support plate; 16, mounting plate; 17, chain plate; 18, chain rod; 19, core plate; 20, sliding plate; 21, sliding limit plate; 22, support frame; 23, limit rod; 24, return spring rod; 25, return spring; 26, pulley; 27, synchronous connecting rope; 28, synchronous sliding plate; 29, synchronous limiting plate; 30, recovery spring; 31, recovery inclined plate; 32, recovery seat; 33, recovery connecting seat; 34, recovery motor; 35, recovery threaded rod; 36, recovery threaded pipe; 37, recovery moving rod; 38, recovery roller; 39, recovery pull rope; 40, conveying roller; 41, fixed roller; 42, bending roller. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art of the elbow technology field without creative efforts shall fall within the protection scope of the present invention.

[0019] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the elbow technology field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The embodiments of the present invention will be described below according to the overall structure of the present invention.

[0020] Please refer to Figures 1 to 2, this embodiment provides a three-station special-shaped pipe bender, including a pipe bending base 1 and a conveying motor 2 fixedly connected to the top of the pipe bending base 1. The output end of the conveying motor 2 is fixedly connected with a conveying roller 40. A fixing plate 3 is fixedly connected to the top of the pipe bending base 1 near the conveying motor 2. One side of the fixing plate 3 is bolted with a fixing roller 41. A bending base 4 is fixedly connected to the top of the pipe bending base 1 near the fixing plate 3. A bending roller 42 is slidably connected to the top of the bending base 4. A special-shaped pipe 5 is slidably connected to one side of the bending roller 42. One side of the fixing plate 3 is fixedly connected with a connecting plate 8. An installation mechanism and a support mechanism are arranged on one side of the connecting plate 8. A synchronization mechanism and a recovery mechanism are arranged inside the special-shaped pipe 5.

[0021] Start the conveying motor 2. The conveying motor 2 drives the conveying roller 40 to rotate. The rotation of the conveying roller 40 can drive the special-shaped pipe 5 to move linearly. During the linear movement of the special-shaped pipe 5, the fixing roller 41 can limit the movement of the special-shaped pipe 5. When the position of the special-shaped pipe 5 that needs to be bent moves to the bending roller 42, the bending operation of the special-shaped pipe 5 can be carried out. Through the synchronous operation of the three stations, the bending operation of the special-shaped pipe 5 can be completed. Please refer to Figures 1 to 3 , in the process of implementing the above technology, it is found that when bending the special-shaped pipe 5, the bending part will cause uneven tensile stress on the outer side and compressive stress on the inner side due to bending, resulting in problems such as wrinkles and depressions on the special-shaped pipe 5, affecting the bending quality of the special-shaped pipe 5. Based on this problem, the following technical improvements are made: The installation mechanism further includes a plurality of flexible support plates 11 slidably connected to the outer wall of the steel wire rope 10. The inner sides of each group of flexible support plates 11 are respectively fixedly connected with a sliding support plate 15. Sliding plates 20 are respectively fixedly connected to both sides of the sliding support plate 15. A sliding limit plate 21 is fixedly connected to the other side of the sliding plate 20. An installation plate 16 is slidably connected to the outer wall of the sliding support plate 15. Chain plates 17 are fixedly connected to both sides of the installation plate 16. Each two chain plates 17 are rotatably connected by a chain rod 18. The other end of the chain plate 17 is rotatably connected to the core plate 19 by a chain rod 18. The core plate 19 is fixedly connected to the inner side of the connecting plate 8.

[0022] The flexible support plate 11 is made of a flexible material and can undergo slight deformation as the special-shaped pipe 5 is bent. Multiple groups of flexible support plates 11 are arranged inside the bending part of the special-shaped pipe 5. When the bending roller 42 bends the special-shaped pipe 5, the bending part will cause the flexible support plate 11 to move linearly inward. The linearly moving flexible support plate 11 drives the sliding support plate 15 to move linearly inside the mounting plate 16. The linear movement of the sliding support plate 15 can keep the flexible support plate 11 in contact with the inside of the special-shaped pipe 5 through the elastic action of the return spring 25, so as to ensure that the filling inside the special-shaped pipe 5 supports the inner wall of the special-shaped pipe 5. The support structure fills the internal space of the special-shaped pipe 5 to offset the unbalanced action of the outer tensile stress and the inner compressive stress, avoiding problems such as wrinkles, depressions, and excessive ovality of the special-shaped pipe 5, and at the same time preventing the cross-section from being distorted due to uneven stress.

[0023] Please refer to Figures 3 to 4 During the implementation of the above technology, it was found that when the special-shaped pipe 5 was sleeved into the support mechanism, due to the action of the chain plate 17 and the link rod 18, the flexible support plates 11 would deflect naturally, affecting the normal installation of the special-shaped pipe 5. Based on this problem, the following technical improvements were made: The installation mechanism includes a hydraulic base 6 fixedly connected to one side of the connecting plate 8, and a hydraulic cylinder 7 is fixedly connected to the top of the hydraulic base 6. The output end of the hydraulic cylinder 7 is fixedly connected to a connecting disc 9, and four steel wire ropes 10 are fixedly connected to one side of the connecting disc 9.

[0024] Before installing the special-shaped pipe 5, start the hydraulic cylinder 7. The hydraulic cylinder 7 can drive the connecting disc 9 to move linearly. The linearly moving connecting disc 9 drives the steel wire ropes 10 to move linearly. After the steel wire ropes 10 move linearly and are straightened, they can drive the flexible support plates 11 to line up, so as to facilitate the special-shaped pipe 5 to be sleeved into the support mechanism and avoid increasing the installation time of the special-shaped pipe 5 due to the deflection between the flexible support plates 11.

[0025] Please refer to Figures 4 to 9 During the implementation of the above technology, it was found that when the special-shaped pipe 5 was bent, as the bending angle of the bending part of the special-shaped pipe 5 increased, the internal material was subjected to axial compressive force and flowed towards the neutral axis, resulting in an increase in wall thickness and a contraction of the inner cavity, which would affect the support of the inner wall of the special-shaped pipe 5 by the internal flexible support plate 11 and affect the bending quality. Based on this problem, the following technical improvements were made: The support mechanism further includes a support frame 22 fixedly connected to the inner side of the sliding support plate 15. Two limiting rods 23 are symmetrically installed on one side of the support frame 22. A resilient rod 24 is fixedly connected to the inner side of the mounting plate 16. One end of the resilient rod 24 penetrates through the support frame 22 and extends to the inner side of the sliding support plate 15. A resilient spring 25 is arranged on the outer wall of the resilient rod 24, and the resilient spring 25 is installed between the support frame 22 and the mounting plate 16. The synchronization mechanism includes a synchronization connection rope 27 fixedly connected to one side of the steel wire rope 10. The other end of the synchronization connection rope 27 is fixedly connected to a synchronization sliding plate 28. A synchronization limiting plate 29 is fixedly connected to the top of the synchronization sliding plate 28. A recovery spring 30 is installed between the synchronization sliding plate 28 and the mounting plate 16. The synchronization mechanism further includes two synchronization grooves symmetrically formed on one side of the flexible support plate 11 and matching with the synchronization connection rope 27. The two synchronization grooves arranged on one side are arranged one above the other. A pulley 26 is rotatably connected to the inside of the synchronization groove close to the synchronization connection rope 27.

[0026] When the flexible support plate 11 deforms, the deformed flexible support plate 11 can drive the steel wire rope 10 to perform a linear motion in the direction of the recovery inclined plate 31. The linearly moving steel wire rope 10 drives the synchronization connection rope 27 to perform a linear motion. The linear motion of the synchronization connection rope 27 drives the synchronization sliding plate 28 to perform a linear motion through the pulley 26. The linearly moving synchronization sliding plate 28 drives the synchronization limiting plate 29 to perform a linear motion. The linear motion of the synchronization limiting plate 29 can limit the moving distance of the linearly moving sliding support plate 15, so that the moving distance of the sliding support plate 15 changes with the bending angle of the special-shaped pipe 5, thereby always ensuring the support of the flexible support plate 11 on the inner wall of the special-shaped pipe 5.

[0027] Please refer to Figures 9 to 11 , in the process of implementing the above technology, it is found that after the special-shaped pipe 5 is bent, since the flexible support plate 11 fits inside the special-shaped pipe 5, when the support mechanism is withdrawn, the special-shaped pipe 5 will limit the flexible support plate 11, affecting the removal of the support mechanism. Forcibly withdrawing will cause damage to the inside of the special-shaped pipe 5, affecting the bending quality of the special-shaped pipe 5. Based on this problem, the following technical improvements are made: The recovery mechanism includes a recovery inclined plate 31 slidably connected to the outer wall of the front end of the steel wire rope 10. One side of the recovery inclined plate 31 is fixedly connected to a recovery seat 32. One side of the recovery seat 32 is fixedly connected to a recovery connection seat 33. The other side of the recovery connection seat 33 is rotatably connected to the link plate 17 through a link rod 18. The recovery mechanism further includes a recovery motor 34 fixedly connected to the inside of the recovery connection seat 33. The output end of the recovery motor 34 is fixedly connected to a recovery threaded rod 35. The outer wall of the recovery threaded rod 35 is threadedly connected to a recovery threaded tube 36. One end of the recovery threaded tube 36 is fixedly connected to a recovery moving rod 37. Both ends of the recovery moving rod 37 are fixedly connected to recovery rollers 38. The outer wall of the recovery roller 38 is slidably connected to a recovery pull rope 39. Both ends of the recovery pull rope 39 are respectively fixedly connected to the other ends of the two steel wire ropes 10. The inside of the recovery seat 32 is provided with a recovery groove matching the recovery moving rod 37.

[0028] After the bending is completed, the recovery motor 34 rotates to drive the recovery threaded rod 35 to rotate. The rotating recovery threaded rod 35 drives the recovery threaded tube 36 to move linearly through the threaded action and the limiting action of the recovery moving rod 37. The linear movement of the recovery threaded tube 36 drives the recovery moving rod 37 to move linearly. The linearly moving recovery moving rod 37 drives the recovery roller 38 to move linearly. The linear movement of the recovery roller 38 drives the steel wire rope 10 to move linearly through the recovery pull rope 39, thereby relaxing the tension of the steel wire rope 10 on the synchronous connection rope 27. At this time, under the elastic action of the recovery spring 30, the synchronous sliding plate 28 can be driven to reset, and the synchronous limiting plate 29 can be driven to release the limitation on the sliding support plate 15, so that the flexible support plate 11 does not need to fit against the inner wall of the special-shaped pipe 5, and finally the damage to the special-shaped pipe 5 caused by the flexible support plate 11 is avoided, and the bending quality of the special-shaped pipe 5 is improved.

[0029] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art of pipe bending technology within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A three-station special-shaped pipe bender, characterized in that, Comprising: An elbow base (1) and a conveying motor (2) fixedly connected to the top of the elbow base (1). The output end of the conveying motor (2) is fixedly connected with a conveying roller (40). A fixing plate (3) is fixedly connected to the top of the elbow base (1) near the conveying motor (2). One side of the fixing plate (3) is connected with a fixing roller (41) by bolts. A bending base (4) is fixedly connected to the top of the elbow base (1) near the fixing plate (3). A bending roller (42) is slidably connected to the top of the bending base (4). A special-shaped pipe (5) is slidably connected to one side of the bending roller (42). A connecting plate (8) is fixedly connected to one side of the fixing plate (3). An installation mechanism and a support mechanism are arranged on one side of the connecting plate (8). A synchronization mechanism and a recycling mechanism are arranged inside the special-shaped pipe (5).

2. The three-station special-shaped pipe bender according to claim 1, wherein, The installation mechanism includes a hydraulic base (6) fixedly connected to one side of the connecting plate (8), and a hydraulic cylinder (7) is fixedly connected to the top of the hydraulic base (6). The output end of the hydraulic cylinder (7) is fixedly connected with a connecting disk (9), and four steel wire ropes (10) are fixedly connected to one side of the connecting disk (9).

3. The three-station special-shaped pipe bender according to claim 2, wherein, The installation mechanism further includes a plurality of groups of flexible support plates (11) slidably connected to the outer wall of the steel wire rope (10). The inner side of each group of flexible support plates (11) is fixedly connected with a sliding support plate (15). Sliding plates (20) are fixedly connected to both sides of the sliding support plate (15). A sliding limit plate (21) is fixedly connected to the other side of the sliding plate (20). An installation plate (16) is slidably connected to the outer wall of the sliding support plate (15). Chain plates (17) are fixedly connected to both sides of the installation plate (16). Each two chain plates (17) are rotatably connected by a chain rod (18). The other end of the chain plate (17) is rotatably connected to a core plate (19) by a chain rod (18), and the core plate (19) is fixedly connected to the inner side of the connecting plate (8).

4. The three-station special-shaped pipe bender according to claim 3, characterized in that, The support mechanism includes two cushion blocks (12) symmetrically installed on the inner side of the flexible support plate (11). Sliding tubes (13) are symmetrically installed on the other side of one of the cushion blocks (12). Sliding rods (14) are symmetrically installed on the other side of the other cushion block (12). The outer wall of the sliding rod (14) is slidably connected to the inner wall of the sliding tube (13).

5. A three-station special-shaped pipe bender according to claim 3, characterized in that, The support mechanism further includes a support frame (22) fixedly connected to the inner side of the sliding support plate (15). Two limit rods (23) are symmetrically installed on one side of the support frame (22). A return spring rod (24) is fixedly connected to the inner side of the installation plate (16). One end of the return spring rod (24) penetrates through the support frame (22) and extends to the inner side of the sliding support plate (15). A return spring (25) is arranged on the outer wall of the return spring rod (24), and the return spring (25) is installed between the support frame (22) and the installation plate (16).

6. The three-station special-shaped pipe bender according to claim 3, wherein, The synchronization mechanism includes a synchronization connection rope (27) fixedly connected to one side of the steel wire rope (10), and the other end of the synchronization connection rope (27) is fixedly connected with a synchronization sliding plate (28). A synchronization limiting plate (29) is fixedly connected to the top of the synchronization sliding plate (28), and a recovery spring (30) is installed between the synchronization sliding plate (28) and the mounting plate (16).

7. A three-station special-shaped pipe bender according to claim 6, characterized in that, The synchronization mechanism further includes two synchronization grooves symmetrically formed on one side of the flexible support plate (11) and matching with the synchronization connection rope (27). The two synchronization grooves arranged on one side are arranged one above the other, and a pulley (26) is rotatably connected to the inside of the synchronization groove close to the synchronization connection rope (27).

8. The three-station special-shaped pipe bender according to claim 6, characterized in that, The recovery mechanism includes a recovery inclined plate (31) slidably connected to the outer wall of the front end of the steel wire rope (10), and a recovery seat (32) is fixedly connected to one side of the recovery inclined plate (31). A recovery connection seat (33) is fixedly connected to one side of the recovery seat (32), and the other side of the recovery connection seat (33) is rotatably connected to the chain plate (17) through a link rod (18).

9. A three-station special-shaped pipe bender according to claim 8, characterized in that The recovery mechanism further includes a recovery motor (34) fixedly connected to the inside of the recovery connection seat (33), and a recovery threaded rod (35) is fixedly connected to the output end of the recovery motor (34). A recovery threaded tube (36) is threadedly connected to the outer wall of the recovery threaded rod (35), and a recovery moving rod (37) is fixedly connected to one end of the recovery threaded tube (36). Recovery rollers (38) are fixedly connected to both ends of the recovery moving rod (37), and a recovery pull rope (39) is slidably connected to the outer wall of the recovery roller (38). The two ends of the recovery pull rope (39) are respectively fixedly connected to the other ends of the two steel wire ropes (10), and a recovery groove matching with the recovery moving rod (37) is arranged inside the recovery seat (32).

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