Automatic pipe bending assembly equipment and assembly method thereof

Abstract

The present invention provides an automatic assembly device for bent pipes and an assembly method thereof. The automatic assembly device for bent pipes comprises a bottom plate, a movable platform and a workpiece rotating device are installed on the bottom plate, a power mechanism is arranged on the movable platform, an output end of the power mechanism is connected to a transmission belt, the other end of the transmission belt is connected to an outer rotating shaft, one end of the outer rotating shaft is connected to a sleeve for assembling bent pipes and nuts, an inner rotating shaft is arranged at the other end of the outer rotating shaft, and an angle control device for driving the inner rotating shaft to rotate and a brake positioning device for braking the inner rotating shaft to rotate are also arranged on the movable platform. The present invention can automatically assemble bent pipes and nuts, lock the bent pipes at a specified angle, is easy to use and maintain, and is safe to operate.

Description

Technical Field

[0001] The invention relates to the technical field of bent pipe assembly of workpieces, in particular to an automatic bent pipe assembly device and an assembly method thereof. Background Art

[0002] Bend pipes are often used as parts for workpiece assembly. Some workpieces are even equipped with more than one bend pipe. Moreover, the problem of fixing the bend pipe angle with the workpiece also needs to be considered. Currently, manual processing is mostly used to assemble bend pipes on workpieces. First, the bend pipe is screwed to a specified angle by hand. Manual screwing has no limit, no angle control, and is inaccurate. Secondly, after the bend pipe is screwed to a specified angle, it is necessary to fix the bend pipe by hand, and use a wrench with the other hand to tighten the nut. During the tightening process, the bend pipe is not stuck and is easy to move with the nut, resulting in angle changes that exceed the angle control range. This affects the accuracy of the assembly position to a certain extent, produces errors, and thus affects the assembly quality of the product. Summary of the invention

[0003] In view of the deficiencies of the above-mentioned prior art, the present invention provides an automatic assembly device for bent pipes and an assembly method thereof, which can automatically assemble bent pipes and nuts and lock the bent pipes at a specified angle, have high assembly accuracy, are easy to use and maintain, and are safe to operate.

[0004] The technical solution provided by the present invention is: an automatic assembly equipment for bent pipes, including a base plate, a movable platform and a workpiece rotating device are installed on the base plate, a power mechanism is provided on the movable platform, the output end of the power mechanism is connected to a transmission belt, the other end of the transmission belt is connected to an outer rotating shaft, one end of the outer rotating shaft is connected to a sleeve for assembling bent pipes and nuts, the other end of the outer rotating shaft is provided with an inner rotating shaft, and the movable platform is also provided with an angle control device for driving the inner rotating shaft to rotate and a brake positioning device for braking the inner rotating shaft to rotate.

[0005] Furthermore, the power mechanism includes a motor and a reducer, the output end of the motor is connected to the reducer, the output end of the reducer is provided with a transmission shaft, the other end of the transmission shaft is provided with a power roller, and the power roller is connected to the outer rotating shaft through a transmission belt.

[0006] Furthermore, a first support plate and a second support plate fixed above the movable platform are respectively provided on the opposite side of the reducer and the power roller to support the entire power mechanism.

[0007] Furthermore, a platform driving device is installed on the base plate for horizontally driving the movable platform to move laterally in the direction of the workpiece rotating device. The platform driving device includes a No. 1 driving cylinder arranged on the side of the base plate. The No. 1 driving cylinder is fixed to the base plate through a No. 1 cylinder seat. A connecting shaft is provided at the output end of the No. 1 driving cylinder. The other end of the connecting shaft is connected to the driving plate arranged on the movable platform. A group of linear bearings are provided at the bottom of the movable platform. The linear bearings are on guide rails arranged parallel to the top of the base plate. The driving cylinder is extended and retracted, and the movable platform is driven to move left and right through the connecting shaft.

[0008] Furthermore, a limit cylinder is provided on the bottom plate at the end of the moving direction of the movable platform for adjusting the moving distance of the movable platform, and a position sensor is also provided on the bottom plate for sensing the moving position of the movable platform.

[0009] Furthermore, the workpiece rotating device includes a No. 2 cylinder, which is fixed above the base plate through a No. 2 cylinder seat, and a horizontal rack is provided at the output end of the No. 2 cylinder, and the horizontal rack is meshingly connected with a horizontal gear. A first limit adjustment device is provided on the base plate at the end of the running direction of the horizontal rack, and a bracket is provided above the horizontal gear, and a turntable for fixing the workpiece is provided on the bracket, and the bottom of the turntable is coaxially mounted on the horizontal gear and rotates synchronously with the horizontal gear.

[0010] Furthermore, a clamp for locking the bent pipe is provided at one end of the inner rotating shaft, and a brake wheel is provided at the other end. The inner rotating shaft with the clamp at one end is horizontally inserted into the sleeve, and a brake positioning device is provided on a movable platform on one side of the inner rotating shaft with the brake wheel at one end. The brake positioning device includes a No. 3 cylinder, and the No. 3 cylinder is fixed on the movable platform through a No. 3 cylinder seat. A guide seat is provided at the output end of the No. 3 cylinder, and a brake shaft for locking the brake wheel is provided at the other end of the guide seat.

[0011] Furthermore, the angle control device includes a No. 4 cylinder, which is fixed on the movable platform through a No. 4 cylinder seat, and a vertical rack is provided at the output end of the No. 2 cylinder, and the vertical rack is meshingly connected with the vertical gear. A second limit adjustment device is provided on the movable platform at the end of the running direction of the vertical rack, and the inner rotating shaft crosses the center of the vertical gear and rotates synchronously with the vertical gear.

[0012] Furthermore, vertically supported support plates No. 3 and No. 4 are respectively provided on the right sides of the outer rotating shaft and the sleeve, and vertically supported support plates No. 5 and No. 6 are arranged in parallel in the middle of the inner rotating shaft. The inner rotating shaft horizontally penetrates the support plates No. 5 and No. 6 and is connected to the bearings in the middle of the support plates.

[0013] The technical solution provided by the present invention is an assembly method of an automatic pipe bending assembly device, comprising the following steps:

[0014] (1) Put the elbow and nut on the position where the workpiece needs to be assembled with the elbow, and fix the workpiece on the turntable of the workpiece rotating device;

[0015] (2) Adjust the workpiece rotating device, change the positioning angle, and adjust the position where the elbow needs to be assembled to an appropriate angle so that it is opposite to the sleeve;

[0016] (3) The movable platform is driven by the platform driving device to move horizontally toward the workpiece rotating device, and moves to a position so that the sleeve covers the bent pipe. The motor is started to drive the power roller to rotate, which drives the transmission belt to rotate, and then drives the outer shaft to rotate. The sleeve rotates synchronously, and the bent pipe of the workpiece is rotated to a specified angle through the sleeve;

[0017] (4) The inner shaft is driven to rotate by the rotation angle control device. When the rotation angle of the clamping head of the inner shaft is consistent with that of the sleeve, the brake shaft of the brake positioning device locks the brake wheel of the inner shaft.

[0018] (5) The movable platform is driven by the platform driving device to further move to the second stage, so that the bent pipe enters the sleeve and is locked by the clamp of the inner shaft;

[0019] (6) After the position sensor detects that the movable platform is pushed to the second position where the elbow is locked, the sleeve covers the nut, and the power mechanism drives the sleeve to continue to rotate to lock the nut;

[0020] (7) The movable platform is moved to the initial position by the platform driving device, and the workpiece is disengaged to complete the assembly of the bent pipe.

[0021] The present invention is suitable for automatic assembly of elbows and nuts. By changing the positioning angle through the workpiece rotating device, the elbows of different directions of the workpiece can be rotated and assembled. The elbow is rotated to a specified angle through the sleeve and the clamp of the inner shaft is controlled to fix the elbow through the angle control device and the brake positioning device. The elbow is locked, and then the nut is tightened through the sleeve to lock the elbow at a specified angle. The present invention saves time and effort in assembly, has high assembly efficiency and high precision, is widely used, is easy to use and maintain, is safe to operate, and has high practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure when the present invention is used;

[0024] Figure 3 It is a schematic diagram of the elevation structure of the brake positioning device and the inner rotating shaft;

[0025] Figure 4It is a schematic diagram of the elevation structure of the corner positioning device and the inner rotating shaft;

[0026] Figure 5 It is a top view of the workpiece rotating device;

[0027] Figure 6 It is a schematic diagram of the structure of the connection between the platform driving device, the base plate and the movable platform;

[0028] Figure 7 It is a schematic diagram of the structure of the sleeve;

[0029] Figure 8 It is a structural schematic diagram of the inner rotating shaft;

[0030] In the figure: 1-bottom plate, 2-movable platform, 201-linear bearing, 3-workpiece rotating device, 301-No. 2 cylinder, 302-No. 2 cylinder seat, 303-horizontal rack, 304-horizontal gear, 305-first limit adjustment device, 306-bracket, 307-turntable, 4-transmission belt, 5-outer shaft, 6-sleeve, 7-inner shaft, 701-chuck, 702-brake wheel, 8-rotation angle control device, 801-No. 4 cylinder, 802-No. 4 cylinder seat, 803-vertical rack, 804-vertical gear, 805-second limit adjustment device, 9-brake positioning device, 901- Cylinder No. 3, 902—Cylinder seat No. 3, 903—Guide seat, 904—Brake shaft, 10—Motor, 11—Reducer, 12—Drive shaft, 13—Power roller, 14—Support plate No. 1, 15—Support plate No. 2, 16—Platform drive device, 1601—Cylinder No. 1, 1602—Cylinder seat No. 1, 1603—Connecting shaft, 1604—Drive plate, 17—Guide rail, 18—Limiting cylinder, 19—Position sensor, 20—Support plate No. 3, 21—Support plate No. 4, 22—Support plate No. 5, 23—Support plate No. 6, 24—Flat key, 25—Workpiece, 26—Nut, 27—Bend pipe. DETAILED DESCRIPTION

[0031] The technical solution of this embodiment will be clearly and completely described below in conjunction with the drawings in this embodiment. Obviously, the described embodiment is only a part of this embodiment, rather than all of the embodiments.

[0032] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top / bottom", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms such as "setting" and "connection" should be understood in a broad sense. For example, "connection" 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 a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] like Figure 1-8 The automatic assembly equipment for bent pipes shown includes a base plate 1, on which a movable platform 2 and a workpiece rotating device 3 are installed, and a power mechanism is provided on the movable platform 2, wherein the output end of the power mechanism is connected to a transmission belt 4, and the other end of the transmission belt 4 is connected to an outer rotating shaft 5, one end of the outer rotating shaft 5 is connected to a sleeve 6 for assembling bent pipes and nuts, and the other end of the outer rotating shaft 5 is provided with an inner rotating shaft 7, and the movable platform 2 is provided with an angle control device 8 for driving the inner rotating shaft 7 to rotate and a brake positioning device 9 for braking the inner rotating shaft 7 to rotate.

[0035] The power mechanism includes a motor 10 and a reducer 11. The output end of the motor 10 is connected to the reducer 11. The output end of the reducer 11 is provided with a transmission shaft 12. The other end of the transmission shaft 12 is provided with a power roller 13. The power roller 13 is connected to the outer shaft 5 through a transmission belt 4.

[0036] The motor 10 is equipped with a servo encoder, and the rotation angle of the sleeve 6 is controlled by the servo encoder.

[0037] The reducer 11 and the power roller 13 are provided with a No. 1 support plate 14 and a No. 2 support plate 15 fixed above the movable platform 2 on the opposite side, respectively, for supporting the entire power mechanism. The base plate 1 is also equipped with a platform driving device 16 for driving the movable platform 2 to move horizontally in the direction of the workpiece rotating device 3. The platform driving device 16 includes a No. 1 cylinder 1601 arranged on the side of the base plate 1. The No. 1 cylinder 1601 is fixed to the base plate 1 through a No. 1 cylinder seat 1602. The output end of the No. 1 cylinder 1601 is provided with a connecting shaft 1603. The other end of the connecting shaft 1603 is connected to a driving plate 1604 arranged on the movable platform 2. A group of linear bearings 201 are provided at the bottom of the movable platform 2, which make linear motion on the guide rail. The linear bearings 201 are on the guide rail 17 arranged parallel to the base plate 1. The No. 1 cylinder 1601 is extended and retracted, and the movable platform 2 is driven to move left and right through the connecting shaft 1603.

[0038] A limit cylinder 18 is provided on the bottom plate 1 at the end of the moving direction of the movable platform 2, which is used to adjust the moving distance of the movable platform 2. A position sensor 19 is also provided on the bottom plate 1 for sensing the moving position of the movable platform 2. The No. 1 cylinder is extended and retracted, and the movable platform is driven to move left and right through the connecting shaft. The limit cylinder can adjust the moving distance of the movable platform, and can control the specific position of the first and second positions.

[0039] The workpiece rotating device 3 comprises a No. 2 cylinder 301, which is fixed on the top of the bottom plate 1 through a No. 2 cylinder seat 302. A horizontal rack 303 is provided at the output end of the No. 2 cylinder 301, which is meshed and connected with a horizontal gear 304. A first limit adjustment device 305 is provided on the bottom plate at the end of the running direction of the horizontal rack 303. A bracket 306 is provided above the horizontal gear 304, and a turntable 307 for fixing the workpiece is provided on the bracket 306. The bottom of the turntable 307 is coaxially mounted on the horizontal gear 304 and rotates synchronously with the horizontal gear 304. The use process of the workpiece rotating device 3 is as follows: the No. 2 cylinder pushes the horizontal rack, which meshes with the horizontal gear and drives the horizontal gear to rotate. The workpiece is placed on the turntable coaxially connected with the horizontal gear, so that the turntable and the workpiece rotate synchronously with the horizontal gear. The first limit adjustment device can adjust the telescopic distance of the rack, and the first limit adjustment device controls the angle of the horizontal gear by adjusting the stroke of the horizontal rack moving forward and backward.

[0040] One end of the inner rotating shaft 7 is provided with a clamp 701 for locking the elbow, and the other end is provided with a brake wheel 702, and the inner rotating shaft 7 is connected with the brake wheel 702 through a flat key 24. The inner rotating shaft 7 with one end of the clamp 701 is horizontally inserted into the sleeve 6, and a brake positioning device 9 is provided on the movable platform 2 on one side of the inner rotating shaft 7 with one end of the brake wheel 702, and the brake positioning device 9 includes a No. 3 cylinder 901, and the No. 3 cylinder 901 is fixed on the movable platform 2 through the No. 3 cylinder seat 902, and the output end of the No. 3 cylinder 901 is provided with a guide seat 903, and the other end of the guide seat 903 is provided with a brake shaft 904 for locking the brake wheel 702. When the inner rotating shaft 7 is rotated to the required angle, the No. 3 cylinder 901 pushes the brake shaft 904 to lock the brake wheel 702, and the No. 3 cylinder 901 retracts to drive the brake shaft 904 to release the brake wheel 702.

[0041] The rotation angle control device 8 includes a No. 4 cylinder 801, which is fixed on the movable platform 2 through a No. 4 cylinder seat 802. A vertical rack 803 is provided at the output end of the No. 4 cylinder 801, and the vertical rack 803 is meshed and connected with a vertical gear 804. A second limit adjustment device 805 is provided on the movable platform 2 at the end of the running direction of the vertical rack 803. The inner rotating shaft 7 crosses the center of the vertical gear 804, and the rotation of the vertical gear 804 synchronously drives the inner rotating shaft 7 to rotate. The No. 4 cylinder pushes the vertical rack, which meshes with the vertical gear and drives the vertical gear to rotate. The inner rotating shaft is coaxially connected with the vertical gear, thereby driving the inner rotating shaft to rotate synchronously. The second limit adjustment device controls the rotation angle of the vertical gear by adjusting the stroke of the vertical rack moving forward and backward.

[0042] The first limit adjustment device has the same structure as the second limit adjustment device, both of which include a fixing plate and a threaded rod. The extended length of the threaded rod can be adjusted by rotating clockwise or counterclockwise to control the travel of the rack.

[0043] The right sides of the outer rotating shaft 5 and the sleeve 6 are respectively provided with a vertically supported No. 3 support plate 20 and a No. 4 support plate 21, and the middle part of the inner rotating shaft 7 is parallelly provided with a vertically supported No. 5 support plate 22 and a No. 6 support plate 23. The inner rotating shaft 7 horizontally penetrates the No. 5 support plate 22 and the No. 6 support plate 23 and is respectively connected to the bearings in the middle of the support plates.

[0044] The cylinder operation and motor operation steps are all interlocked and controlled by the controller and can be realized by starting the operation button.

[0045] An assembly method for an automatic pipe bending assembly device comprises the following steps:

[0046] (1) Put the elbow and nut on the position where the workpiece needs to be assembled with the elbow, and fix the workpiece on the turntable of the workpiece rotating device;

[0047] (2) Adjust the workpiece rotating device, change the positioning angle, and adjust the position where the elbow needs to be assembled to an appropriate angle so that it is opposite to the sleeve;

[0048] (3) The movable platform is driven by the platform driving device to move horizontally toward the workpiece rotating device, and moves to a position so that the sleeve covers the bent pipe. The motor is started to drive the power roller to rotate, which drives the transmission belt to rotate, and then drives the outer shaft to rotate. The sleeve rotates synchronously, and the bent pipe of the workpiece is rotated to a specified angle through the sleeve;

[0049] (4) The inner shaft is driven to rotate by the rotation angle control device. When the rotation angle of the clamping head of the inner shaft is consistent with that of the sleeve, the brake shaft of the brake positioning device locks the brake wheel of the inner shaft.

[0050] (5) The movable platform is driven by the platform driving device to further move to the second stage, so that the bent pipe enters the sleeve and is locked by the clamp of the inner shaft;

[0051] (6) After the position sensor detects that the movable platform is pushed to the second position where the elbow is locked, the sleeve covers the nut, and the power mechanism drives the sleeve to continue to rotate to lock the nut;

[0052] (7) The movable platform is moved to the initial position by the platform driving device, and the workpiece is disengaged to complete the assembly of the bent pipe.

[0053] When it is necessary to assemble a bent pipe at another position of the workpiece, the above steps can be repeated to achieve the desired effect.

[0054] The torque of the sleeve rotation can be set and adjusted to meet different tightening torque requirements. The motor can rotate forward and reverse, and can tighten or loosen the nut. The shape of the sleeve can be customized according to the requirements of the workpiece, and is compatible with the needs of elbow and nut locking. When tightening the elbow, the sleeve works in the first position and the nut is not interfered. When tightening the nut, it works in the second position, the elbow enters the sleeve, avoids the nut, and is locked by the clamp of the inner shaft. At this time, the elbow can be locked at a specified angle, avoiding the elbow moving together when the nut is locked during manual operation, causing the fixed angle of the elbow to change.

[0055] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automatic assembly device for bent pipes, comprising a base plate (1), characterized in that: A movable platform (2) and a workpiece rotating device (3) are mounted on the bottom plate (1); a power mechanism is disposed on the movable platform (2); an output end of the power mechanism is connected to a transmission belt (4); the other end of the transmission belt (4) is connected to an outer rotating shaft (5); one end of the outer rotating shaft (5) is connected to a sleeve (6) for assembling a bent pipe and a nut; the other end of the outer rotating shaft (5) is provided with an inner rotating shaft (7); and an angle control device (8) for driving the inner rotating shaft (7) to rotate and a brake positioning device (9) for braking the inner rotating shaft (7) to rotate are disposed on the movable platform (2); The base plate (1) is also provided with a platform driving device (16) for driving the movable platform (2) to move horizontally in the direction of the workpiece rotating device (3); The workpiece rotating device (3) comprises a No. 2 cylinder (301), the No. 2 cylinder (301) being fixed on the top of the bottom plate (1) via a No. 2 cylinder seat (302), a horizontal rack (303) being provided at the output end of the No. 2 cylinder (301), the horizontal rack (303) being meshingly connected with a horizontal gear (304), a first limit adjustment device (305) being provided on the bottom plate at the end of the running direction of the horizontal rack (303), a bracket (306) being provided above the horizontal gear (304), a rotating disk (307) for fixing the workpiece being provided on the bracket (306), the bottom of the rotating disk (307) being coaxially mounted on the horizontal gear (304) and rotating synchronously with the horizontal gear (304); One end of the inner rotating shaft (7) is provided with a clamp (701) for locking the bent pipe, and the other end is provided with a brake wheel (702). The inner rotating shaft (7) provided with one end of the clamp (701) is horizontally inserted into the sleeve (6), and a brake positioning device (9) is provided on the movable platform (2) on one side of the inner rotating shaft (7) provided with one end of the brake wheel (702). The brake positioning device (9) comprises a No. 3 cylinder (901), and the No. 3 cylinder (901) is fixed on the movable platform (2) through a No. 3 cylinder seat (902). The output end of the No. 3 cylinder (901) is provided with a guide seat (903), and the other end of the guide seat (903) is provided with a brake shaft (904) for locking the brake wheel (702).

2. The automatic pipe bending assembly equipment according to claim 1 is characterized in that: The power mechanism comprises a motor (10) and a reducer (11); the output end of the motor (10) is connected to the reducer (11); the output end of the reducer (11) is provided with a transmission shaft (12); the other end of the transmission shaft (12) is provided with a power roller (13); the power roller (13) is connected to the outer rotating shaft (5) via a transmission belt (4).

3. The automatic pipe bending assembly equipment according to claim 2 is characterized in that: A first support plate (14) and a second support plate (15) fixed above the movable platform (2) are respectively provided on the opposite side of the reducer (11) and the power roller (13) for supporting the entire power mechanism.

4. The automatic pipe bending assembly equipment according to claim 1 is characterized in that: The platform driving device (16) comprises a No. 1 cylinder (1601) arranged on the side of the base plate (1), the No. 1 cylinder (1601) is fixed to the base plate (1) via a No. 1 cylinder seat (1602), a connecting shaft (1603) is provided at the output end of the No. 1 cylinder (1601), the other end of the connecting shaft (1603) is connected to a driving plate (1604) arranged on the movable platform (2), a group of linear bearings (201) are provided at the bottom of the movable platform (2), the linear bearings (201) are located on a guide rail (17) arranged parallel to the top of the base plate (1), the No. 1 cylinder (1601) is extended and retracted, and the movable platform (2) is driven to move left and right via the connecting shaft (1603).

5. The automatic pipe bending assembly equipment according to claim 4 is characterized in that: A limit cylinder (18) is provided on the bottom plate (1) at the end of the moving direction of the movable platform (2) for adjusting the moving distance of the movable platform (2), and a position sensor (19) for sensing the moving position of the movable platform (2) is also provided on the bottom plate (1).

6. The automatic pipe bending assembly equipment according to claim 1 is characterized in that: The rotation angle control device (8) comprises a No. 4 cylinder (801), wherein the No. 4 cylinder (801) is fixed to the movable platform (2) via a No. 4 cylinder seat (802), a vertical rack (803) is provided at the output end of the No. 4 cylinder (801), the vertical rack (803) is meshingly connected with a vertical gear (804), a second limit adjustment device (805) is provided on the movable platform (2) at the end of the running direction of the vertical rack (803), the inner rotating shaft (7) crosses the center of the vertical gear (804), and the rotation of the vertical gear (804) synchronously drives the inner rotating shaft (7) to rotate.

7. The automatic pipe bending assembly equipment according to claim 1 is characterized in that: A third support plate (20) and a fourth support plate (21) are respectively arranged vertically on the right sides of the outer rotating shaft (5) and the sleeve (6); a fifth support plate (22) and a sixth support plate (23) are arranged vertically in parallel in the middle of the inner rotating shaft (7); the inner rotating shaft (7) horizontally penetrates the fifth support plate (22) and the sixth support plate (23) and is respectively connected to bearings in the middle of the support plates.

8. The assembly method of the automatic pipe bending assembly equipment according to any one of claims 1 to 7, characterized in that The steps include: (1) Put the elbow and nut on the position where the workpiece needs to be assembled with the elbow, and fix the workpiece on the turntable of the workpiece rotating device; (2) Adjust the workpiece rotating device, change the positioning angle, and adjust the position where the elbow needs to be assembled to an appropriate angle so that it is opposite to the sleeve; (3) The platform driving device drives the movable platform to move horizontally toward the workpiece rotating device, moves to a certain position, and makes the sleeve cover the bent pipe. The motor is started to drive the power roller to rotate, which drives the transmission belt to rotate, and then drives the outer shaft to rotate. The sleeve rotates synchronously, and the bent pipe of the workpiece is rotated to a specified angle through the sleeve; (4) The inner shaft is driven to rotate by the rotation angle control device. When the rotation angle of the chuck of the inner shaft is consistent with that of the sleeve, the brake shaft of the brake positioning device locks the brake wheel of the inner shaft. (5) The movable platform is further moved to the second stage by the platform driving device, so that the bent pipe enters the sleeve and is locked by the clamp of the inner shaft; (6) After the position sensor detects that the movable platform is pushed to the second position where the elbow is locked, the sleeve covers the nut, and the power mechanism drives the sleeve to continue to rotate to lock the nut; (7) The movable platform is moved to the initial position by the platform driving device, and the workpiece is disengaged to complete the assembly of the bent pipe.

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