A serpentine pipe automatic bending machine and bending method with left-right rotating units arranged in front and behind

Abstract

The present invention discloses a serpentine automatic pipe bending machine and a pipe bending method with left-hand and right-hand rotating units arranged in front and back. The serpentine automatic pipe bending machine includes a feeding station, a first rotational pipe bending station, and a second rotational pipe bending station. The feeding station is provided with a feeding unit for conveying a portion of a pipe to be bent to the first rotational pipe bending station or the second rotational pipe bending station. One of the first rotational pipe bending station and the second rotational pipe bending station is provided with a left-hand rotating pipe bending unit for achieving left-hand bending of the pipe, and the other of the first rotational pipe bending station and the second rotational pipe bending station is provided with a right-hand rotating pipe bending unit for achieving right-hand bending of the pipe. During operation, the feeding unit alternately conveys each portion of the pipe to be bent to the left-hand rotating pipe bending unit and the right-hand rotating pipe bending unit in sequence to achieve alternating left-hand and right-hand bending of the pipe. The present invention improves the pipe bending efficiency of the serpentine pipe bending machine.

Description

Technical Field

[0001] The invention relates to the technical field of serpentine pipe manufacturing, in particular to an automatic serpentine pipe bending machine with left-right rotating units arranged in front and back, and a pipe bending method. Background Art

[0002] The automatic serpentine tube bending machine is a device that bends and deforms tubes into serpentine tubes.

[0003] The serpentine tube bending machine in the prior art is a single-unit tube bending machine, a typical example of which is a spiral fin serpentine tube bending machine and a spiral fin serpentine tube manufacturing method (CN110394386A), which includes a machine platform, a rotating arm workbench, an upper and lower opening and closing mold, a tube body clamping mechanism and a side pushing device. The side pushing device includes a side pushing movable seat that can move laterally relative to the front and rear directions of the machine platform, and a push guide plate that is arranged on the side pushing movable seat and can move along the front and rear directions. The push guide plate is provided with a guide groove for leveling the side of the tube body. The side pushing movable seat is laterally moved by a side pushing pressing mechanism, and the push guide plate is moved forward and backward by a push cylinder. The rotating arm workbench is rotated to a certain angle by a rotary drive mechanism.

[0004] The aforementioned single-unit serpentine pipe bender requires the pipe to be flipped 180 degrees after one elbow before the next bend can be made. This has the disadvantage of requiring a significant amount of auxiliary time, and the degree of automation needs to be further improved.

[0005] In order to overcome the above shortcomings, we have developed the first generation of serpentine tube automatic bending machine technology that integrates feeding and bending. The structure of the bending unit is a single-station single head or a single-station double head. Combined with the automatic feeding unit, it can realize the automatic bending of serpentine tubes, thereby improving the degree of automation of the serpentine tube bending machine, but there is still much room for improvement in improving the bending efficiency.

[0006] Furthermore, the prior art discloses a serpentine tube bender (German Patent GB1326048A, published on August 8, 1973). The left-hand and right-hand rotating units in this serpentine tube bender are arranged horizontally, that is, the left-hand and right-hand rotating units are arranged horizontally relative to the tube feed direction. Currently, dual-unit (dual-head) serpentine tube benders on the market generally adopt the unit layout of German Patent GB1326048A. A disadvantage of this dual-head serpentine tube bender is that the dual heads spend a significant portion of their time in horizontal movement during the tube bending process, resulting in low bending efficiency. Summary of the Invention

[0007] To solve the above problems, the present invention proposes a serpentine automatic pipe bending machine and a pipe bending method with left-right rotating units arranged in front and back, aiming to improve the bending efficiency of the serpentine pipe bending machine. The specific technical solution is as follows:

[0008] The serpentine tube automatic bending machine is provided with left-hand and right-hand rotating units arranged in front and back, comprising a feeding station and two tube bending stations, the two tube bending stations comprising a first rotation tube bending station arranged in front of the feeding station and a second rotation tube bending station arranged in front of the first rotation tube bending station, the feeding station being provided with a feeding unit for conveying the part to be bent of the tube to the first rotation tube bending station or the second rotation tube bending station, one of the first rotation tube bending station and the second rotation tube bending station being provided with a left-hand rotating tube bending unit for realizing left-hand bending of the tube, and the other of the first rotation tube bending station and the second rotation tube bending station being provided with a right-hand rotating tube bending unit for realizing right-hand bending of the tube; when working, the feeding unit conveys the parts to be bent of the tube to the left-hand rotating tube bending unit and the right-hand rotating tube bending unit alternately in sequence to realize alternating left-hand and right-hand bending of the tube.

[0009] As one of the preferred arrangements of the pipe bending machine group in the present invention, the left-handed pipe bending machine group is arranged on the first rotational pipe bending station, and the right-handed pipe bending machine group is arranged on the second rotational pipe bending station.

[0010] As the second preferred arrangement of the pipe bending machine group in the present invention, the right-handed pipe bending machine group is arranged on the first rotational pipe bending station, and the left-handed pipe bending machine group is arranged on the second rotational pipe bending station.

[0011] In the present invention, the left-handed pipe bending machine unit and the right-handed pipe bending machine unit are both lifting-type upsetting pipe bending machine units; the lifting-type upsetting pipe bending machine unit includes a lifting seat, a rotating arm rotatably arranged on the lifting seat, a pipe bending mold arranged at the rotation center of the rotating arm, a pipe tightening assembly at the mold arranged on the rotating arm for tightening or loosening the pipe abutting against the pipe bending mold, a transverse moving seat arranged on the lifting seat that moves in the left and right directions, a longitudinal boosting plate set on the transverse moving seat that moves in the front and rear directions, and a boosting plate pipe tightening assembly arranged on the longitudinal boosting plate for tightening or loosening the pipe abutting against the longitudinal boosting plate.

[0012] In the present invention, the longitudinal assisting platens in the left-hand pipe bending unit and the right-hand pipe bending unit have their assisting surfaces in contact with the pipe facing oppositely in the left and right directions; wherein, the assisting surface of the longitudinal assisting platen on the left-hand pipe bending unit is arranged to the left, and the assisting surface of the longitudinal assisting platen on the right-hand pipe bending unit is arranged to the right, or the assisting surface of the longitudinal assisting platen on the left-hand pipe bending unit is arranged to the right, and the assisting surface of the longitudinal assisting platen on the right-hand pipe bending unit is arranged to the left.

[0013] Preferably, the mold surface of the longitudinal boosting mold plate on the pipe bending machine unit is an arc groove adapted to the outer diameter of the pipe.

[0014] In the present invention, the feeding unit includes a material rack, a pair of parallel and spaced guide rails arranged on the material rack, and a numerically controlled automatic feeding trolley arranged on the guide rails and moving along the front-rear direction.

[0015] Preferably, a number of floating bracket assemblies for supporting the pipes are arranged on the material rack at intervals along the front-to-back direction between a pair of the guide rails, and the floating bracket assembly includes a swing block arranged on the material rack by a hinge shaft, the upper part of the swing block is in the shape of a triangular head, and a roller for supporting the pipe is arranged at the position of the upper triangular head of the swing block, and tension springs are respectively connected to the front and rear sides of the lower end of the swing block.

[0016] In the present invention, when the CNC automatic feeding trolley moves back and forth on the guide rail of the material rack, the triangular head of the swing block is pushed by the CNC automatic feeding trolley and swings to a certain angle to make way for the CNC automatic feeding trolley and allow the CNC automatic feeding trolley to pass smoothly over the swing block; after the CNC automatic feeding trolley passes smoothly over the swing block, the swing block swings back to its original position under the action of the balancing force of the tension spring.

[0017] In the present invention, the bent tube mold is an upper and lower opening and closing mold, and the upper and lower opening and closing mold is realized by an opening and closing mechanism; the lifting seat is realized to move up and down by a lifting cylinder, the horizontal moving seat is realized to move left and right by a horizontal moving cylinder, and the longitudinal boosting template is realized to move longitudinally along the front and rear direction by a longitudinal boosting cylinder; the rotating arm is realized to rotate by a rotating drive mechanism.

[0018] Wherein, the longitudinal boosting oil cylinder is built into the transverse moving seat.

[0019] In the present invention, the CNC automatic feeding trolley realizes longitudinal movement along the guide rail direction through a gear rack transmission mechanism driven by a first servo motor; the CNC automatic feeding trolley is provided with a worm gear transmission box driven by a second servo motor, and the hollow output shaft of the worm gear transmission box is provided with a spring chuck for clamping and loosening the pipe, and the spring chuck is clamped or loosened by a lever-type fork driven by a clamping cylinder.

[0020] The hollow output shaft of the worm gear transmission box can be driven by the second servo motor to rotate, so that it can automatically bend to adapt to the spatial angles of the pipe sections at the two end positions of the serpentine pipe.

[0021] A pipe bending method using a serpentine pipe automatic bending machine with left-right rotating units arranged in front and back, characterized by comprising the following steps:

[0022] (1) Loading: Load the pipe onto the roller of the floating bracket assembly of the material rack, and make the pipe pass through the hollow output shaft of the CNC automatic feeding trolley;

[0023] (2) Tube feeding: Start the CNC automatic feeding trolley and feed the part of the tube to be bent to the first rotary tube bending station;

[0024] (3) First rotation direction pipe bending: start the pipe bending unit on the first rotation direction pipe bending station to bend the pipe 180 degrees in the first rotation direction;

[0025] (4) Tube feeding: Start the CNC automatic feeding trolley and send the next part of the tube to be bent to the second rotary bending station;

[0026] (5) Second rotation direction pipe bending: Start the pipe bending unit on the second rotation direction pipe bending station to perform the second rotation direction 180 degree bending of the pipe;

[0027] (6) Alternating bending: Repeat steps (2) to (5) to achieve automatic continuous bending of the serpentine tube;

[0028] The bending direction of the first 180-degree bend is opposite to the bending direction of the second 180-degree bend;

[0029] Among them, when the pipe bending unit on the first rotational pipe bending station is a left-handed pipe bending unit, the bending direction of the first rotational 180-degree bend is a 180-degree left-hand bend; when the pipe bending unit on the first rotational pipe bending station is a right-handed pipe bending unit, the bending direction of the first rotational 180-degree bend is a 180-degree right-hand bend;

[0030] Among them, when the pipe bending unit on the second rotational pipe bending station is a left-handed pipe bending unit, the bending direction of its second rotational 180-degree bend is a 180-degree left-handed bend; when the pipe bending unit on the second rotational pipe bending station is a right-handed pipe bending unit, the bending direction of its second rotational 180-degree bend is a 180-degree right-handed bend.

[0031] In the present invention, the feeding action of the CNC automatic feeding trolley includes the retreat of the CNC automatic feeding trolley when the spring chuck is released and the forward conveyance of the pipe when the spring chuck is clamped; the bending action of the pipe bending unit includes the bending action in the first half cycle and the reset action after the bending in the second half cycle.

[0032] The first half cycle of the pipe bending action includes, in sequence, the lifting seat rising to the pipe bending position, the pipe tightening assembly at the tire mold tightening the pipe, the lateral movable seat moving in the left and right directions toward the pipe so that the longitudinal boosting template on the lateral movable seat is in close contact with the pipe, the pipe tightening assembly at the boosting position tightening the pipe, and the longitudinal boosting template cooperating with the longitudinal boosting template along the front-to-back direction while the rotating arm rotates;

[0033] The bending action in the second half of the cycle includes, in sequence, the loosening of the tube pressing assembly at the tire mold, the loosening of the tube pressing assembly at the auxiliary push, the resetting of the lateral movable seat in the reverse direction, the loosening of the upper and lower opening and closing tire molds, the resetting of the longitudinal auxiliary push plate in the reverse direction, the downward movement of the lifting seat out of the bending position and resetting, the closing and resetting of the upper and lower opening and closing tire molds, and the resetting of the rotating arm in the reverse direction.

[0034] Among them, the CNC automatic feeding trolley uses the time when the pipe bending machine is performing the first half of the cycle bending action to complete the retreat of the spring clamp when the pipe is released; the CNC automatic feeding trolley uses the time when the pipe bending machine is performing the second half of the cycle bending action to complete the spring clamp when the pipe is clamped to send the pipe to the part to be bent to another pipe bending machine.

[0035] In the present invention, a base is provided on the pipe bending machine unit, a base frame is provided on the base for movement in the left and right directions, the lifting cylinder is installed on the base frame, and a lateral adjustment cylinder is provided between the base and the base frame for adjusting the left and right position of the base frame.

[0036] The beneficial effects of the present invention are:

[0037] First, the present invention provides an automatic serpentine tube bending machine and a tube bending method with left-hand and right-hand rotating units arranged in front and back. Two small R-top pier tube bending units are adopted, one is a left-hand tube bending unit and the other is a right-hand tube bending unit. The two tube bending units are arranged in front and back, with lifting and lateral movement functions, and the actions of the left-hand and right-hand tube bending units cooperate with each other to realize continuous bending of the serpentine tube; since the tube is directly delivered to the corresponding tube bending station without turning over, the two tube bending units can achieve seamless connection in the tube bending action time except for the tube feeding action, without unnecessary waiting time, so its tube bending efficiency is greatly improved compared with the traditional single tube bending unit.

[0038] Second, the present invention provides a serpentine tube automatic bending machine and bending method with left and right rotating units arranged in front and behind, and an improved floating bracket assembly with an elastic swinging structure, which can smoothly make way for the CNC automatic feeding trolley, and can adapt to the floating support of extra-long tubes with large linear errors to prevent the tubes from being suspended in the air. Compared with the traditional cylinder telescopic support method, it has better reliability.

[0039] Third, the present invention provides a serpentine tube automatic bending machine and bending method with left-hand and right-hand rotating units arranged in front and behind. The feeding unit, right-hand bending unit and left-hand bending unit are all modularly designed and easy to install and maintain.

[0040] Fourth, the present invention provides an automatic serpentine tube bending machine and method with two left-right rotating units arranged in front and behind each other. The CNC automatic feeding trolley has a spatial angle function, which can automatically bend the two ends of the serpentine tube at a spatial angle. In addition, the CNC automatic feeding trolley can also play a role in coordinating the tube push.

[0041] Fifth, the present invention provides a serpentine tube automatic bending machine and a tube bending method with left and right rotating units arranged in front and back, which uses a first servo motor to drive a CNC automatic feeding trolley. The rotation speed of the first servo motor is adjustable, thereby ensuring that the trolley and the tube bending action are synchronized. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a three-dimensional structural diagram of a serpentine tube automatic bender with left-right rotating units arranged front and back according to the present invention;

[0043] Figure 2 yes Figure 1 A partial enlarged view of

[0044] Figure 3 yes Figure 1 Partial plan view of .

[0045] In the figure: 1. Feeding station, 2. First rotation bending station, 3. Second rotation bending station, 4. Feeding unit, 5. Right-hand bending unit, 6. Left-hand bending unit, 7. Pipe, 8. Lifting seat, 9. Rotating arm, 10. Pipe bending mold, 11. Pipe tightening assembly at the mold, 12. Lateral moving seat, 13. Longitudinal booster template, 14. Pipe tightening assembly at the booster, 15. Backing surface of the longitudinal booster template (arc groove), 16. Material rack, 17. Guide rail, 18. Controlled automatic feeding trolley, 19. Floating bracket assembly, 20. Hinge shaft, 21. Swing block, 22. Roller, 23. Tension spring, 24. Lifting cylinder, 25. Lateral moving cylinder, 26. Longitudinal booster cylinder, 27. First servo motor, 28. Rack and pinion transmission mechanism, 29. Second servo motor, 30. Worm gear transmission box, 31. Spring chuck, 32. Clamping cylinder, 33. Lever-type fork, 34. Lateral adjustment cylinder, 35. Base frame, 36. Base. DETAILED DESCRIPTION

[0046] The following embodiments are further described in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Example 1:

[0047] like Figures 1 to 3 The figure shows an embodiment of a serpentine tube automatic bending machine with left and right rotation units arranged in front and behind of the present invention, comprising a feeding station 1 and two bending stations, wherein the two bending stations include a first rotation bending station 2 arranged in front of the feeding station 1 and a second rotation bending station 3 arranged in front of the first rotation bending station 2. The feeding station 1 is provided with a feeding unit 4 for conveying the portion of the tube 7 to be bent to the first rotation bending station 2 or the second rotation bending station 3. One of the first and second rotational pipe bending stations 3 is provided with a left-handed pipe bending unit 6 for realizing left-handed bending of the pipe 7, and the other of the first and second rotational pipe bending stations 2 and 3 is provided with a right-handed pipe bending unit 5 for realizing right-handed bending of the pipe 7; during operation, the feeding unit 4 alternately transports the various parts to be bent of the pipe 7 to the left-handed pipe bending unit 6 and the right-handed pipe bending unit 5 in sequence to realize alternating left-handed and right-handed bending of the pipe 7.

[0048] As one of the preferred arrangements of the pipe bending machine group in this embodiment, the left-hand pipe bending machine group 6 is arranged on the first rotational pipe bending station 2, and the right-hand pipe bending machine group 5 is arranged on the second rotational pipe bending station 3.

[0049] As the second preferred arrangement of the pipe bending machine group in this embodiment, the right-handed pipe bending machine group 5 is arranged on the first rotational pipe bending station 2, and the left-handed pipe bending machine group 6 is arranged on the second rotational pipe bending station 3.

[0050] In this embodiment, the left-handed pipe bending machine unit 6 and the right-handed pipe bending machine unit 5 are both lifting-type upsetting pipe bending machine units; the lifting-type upsetting pipe bending machine unit includes a lifting seat 8, a rotating arm 9 rotatably arranged on the lifting seat 8, a bending pipe mold 10 arranged at the rotation center of the rotating arm 9, a pipe tightening assembly 11 at the mold arranged on the rotating arm 9 for tightening or loosening the pipe 7 abutting against the bending pipe mold 10, a transverse moving seat 12 movable along the left and right directions on the lifting seat 8, a longitudinal boosting plate 13 movable along the front and rear directions on the transverse moving seat 12, and a boosting pipe tightening assembly 14 arranged on the longitudinal boosting plate 13 for tightening or loosening the pipe 7 abutting against the longitudinal boosting plate 13.

[0051] In this embodiment, the longitudinal boosting plate 13 in the left-handed pipe bending unit 6 and the right-handed pipe bending unit 5 has its supporting surface in contact with the pipe 7 in opposite directions in the left-right direction; wherein, the supporting surface of the longitudinal boosting plate 13 on the left-handed pipe bending unit 6 is set to the left, and the supporting surface of the longitudinal boosting plate 13 on the right-handed pipe bending unit 5 is set to the right, or the supporting surface of the longitudinal boosting plate 13 on the left-handed pipe bending unit 6 is set to the right, and the supporting surface of the longitudinal boosting plate 13 on the right-handed pipe bending unit 5 is set to the left.

[0052] Preferably, the mold surface of the longitudinal boosting mold plate 13 on the pipe bending machine units 5 and 6 is an arc groove adapted to the outer diameter of the pipe 7.

[0053] In this embodiment, the feeding unit 4 includes a material rack 16, a pair of parallel and spaced guide rails 17 provided on the material rack 16, and a CNC automatic feeding trolley 18 provided on the guide rails 17 and moving along the front-rear direction.

[0054] Preferably, a number of floating bracket assemblies 19 for supporting the tube 7 are arranged at intervals along the front-to-back direction on the material rack 16 between a pair of the guide rails 17. The floating bracket assembly 19 includes a swing block 21 rotatably arranged on the material rack 16 via a hinge shaft 20. The upper part of the swing block 21 is in the shape of a triangular head, and a roller 22 for supporting the tube 7 is arranged at the upper triangular head position of the swing block 21. Tension springs 23 are respectively connected to the front and rear sides of the lower end of the swing block 21.

[0055] In this embodiment, when the CNC automatic feeding trolley 18 moves back and forth on the guide rail 17 of the material rack 16, the triangular head of the swing block 21 is pushed by the CNC automatic feeding trolley 18 and swings to a certain angle to make way for the CNC automatic feeding trolley 18 and allow the CNC automatic feeding trolley 18 to pass smoothly over the swing block 21; after the CNC automatic feeding trolley 18 passes smoothly over the swing block 21, the swing block 21 swings back to its original position under the balancing force of the tension spring 23.

[0056] In this embodiment, the bent tube mold 10 is an upper and lower opening and closing mold, and the upper and lower opening and closing mold is realized by an opening and closing mechanism; the lifting seat 8 is moved up and down by the lifting cylinder 24, and the horizontal moving seat 12 is moved left and right by the horizontal moving cylinder 25, and the longitudinal booster template 13 is moved longitudinally along the front and rear direction by the longitudinal booster cylinder 26; the rotating arm 9 is rotated by a rotating drive mechanism.

[0057] The longitudinal boosting oil cylinder 26 is placed in the transverse moving seat 12 .

[0058] In this embodiment, the CNC automatic feeding trolley 18 realizes longitudinal movement along the guide rail 17 through a gear rack transmission mechanism 28 driven by a first servo motor 27; the CNC automatic feeding trolley 18 is provided with a worm gear transmission box 30 driven by a second servo motor 29, and the hollow output shaft of the worm gear transmission box 30 is provided with a spring chuck 31 for clamping and loosening the pipe, and the spring chuck 31 is clamped or loosened by a lever-type fork 33 driven by a clamping cylinder 32.

[0059] The hollow output shaft of the worm gear transmission box 30 can be driven by the second servo motor 29 to rotate, so as to automatically bend to adapt to the spatial angles of the pipe sections at the two end positions of the serpentine pipe. Example 2:

[0060] A pipe bending method using a serpentine pipe automatic bending machine with left-right rotating units arranged in front and back, characterized by comprising the following steps:

[0061] (1) Loading: Load the tube 7 onto the roller 22 of the floating bracket assembly 19 of the material rack 16, and allow the tube 7 to pass through the hollow output shaft of the CNC automatic feeding trolley 18;

[0062] (2) Tube feeding: Start the CNC automatic feeding trolley 18 and feed the part of the tube 7 to be bent to the first rotary tube bending station 2;

[0063] (3) First rotational direction pipe bending: start the pipe bending unit on the first rotational direction pipe bending station 2 to perform a first rotational direction 180-degree bend on the pipe 7;

[0064] (4) Tube feeding: Start the CNC automatic feeding trolley 18 and feed the next part of the tube 7 to be bent to the second rotary bending station 3;

[0065] (5) Second rotational direction pipe bending: Start the pipe bending unit on the second rotational direction pipe bending station 3 to perform the second rotational direction 180-degree bending of the pipe 7;

[0066] (6) Alternating bending: Repeat steps (2) to (5) to achieve automatic continuous bending of the serpentine tube;

[0067] The bending direction of the first 180-degree bend is opposite to the bending direction of the second 180-degree bend;

[0068] Among them, when the pipe bending unit on the first rotational pipe bending station 2 is a left-handed pipe bending unit 6, the bending direction of the first rotational 180-degree bend is a 180-degree left-hand bend; when the pipe bending unit on the first rotational pipe bending station 2 is a right-handed pipe bending unit 5, the bending direction of the first rotational 180-degree bend is a 180-degree right-hand bend;

[0069] Among them, when the pipe bending unit on the second rotational pipe bending station 3 is a left-handed pipe bending unit 6, the bending direction of its second rotational 180-degree bend is a 180-degree left-hand bend; when the pipe bending unit on the second rotational pipe bending station 3 is a right-handed pipe bending unit 5, the bending direction of its second rotational 180-degree bend is a 180-degree right-hand bend.

[0070] In this embodiment, the feeding action of the CNC automatic feeding trolley 18 sequentially includes the retreat of the CNC automatic feeding trolley 18 when the tube 7 is released and the forward conveyance of the tube 7 when the tube 7 is clamped by the spring chuck 31; the bending action of the tube bending units 5 and 6 sequentially includes the bending action in the first half cycle and the reset action after the bending in the second half cycle.

[0071] The pipe bending action in the first half cycle sequentially includes the lifting seat 8 rising to the pipe bending position, the pipe tightening assembly 11 at the tire mold tightening the pipe 7, the transverse moving seat 12 moving in the left and right directions toward the pipe 7 so that the longitudinal boosting template 13 on the transverse moving seat 12 is in close contact with the pipe 7, the pipe tightening assembly 14 at the boosting position tightening the pipe 7, and the rotating arm 9 rotating while the longitudinal boosting template 13 is longitudinally and cooperatively boosted in the front-to-back direction.

[0072] The bending action in the second half of the cycle includes, in sequence, the loosening of the tube 7 by the tube pressing assembly 11 at the tire mold, the loosening of the tube 7 by the tube pressing assembly 14 at the auxiliary pusher, the reverse movement and reset of the lateral movable seat 12, the loosening of the upper and lower opening and closing tire molds, the reverse movement and reset of the longitudinal auxiliary pusher plate 13, the downward movement of the lifting seat 8 out of the bending position and reset, the closing and reset of the upper and lower opening and closing tire molds, and the reverse rotation and reset of the rotating arm 9.

[0073] Among them, the CNC automatic feeding trolley 18 uses the time when the pipe bending machine unit 5 or 6 is performing the first half of the cycle bending action to complete the retreat of the spring clamp 31 when the pipe 7 is released; the CNC automatic feeding trolley 18 uses the time when the pipe bending machine unit 5 or 6 is performing the second half of the cycle bending action to complete the spring clamp 31 when the pipe 7 is clamped to send the part to be bent of the pipe 7 to another pipe bending machine unit 6 or 5.

[0074] In this embodiment, a base 36 is provided on the pipe bending machine unit 5 or 6, and a base frame 35 is provided on the base 36 for movement in the left and right directions. The lifting cylinder 24 is installed on the base frame 35, and a lateral adjustment cylinder 34 is provided between the base 36 and the base frame 35 for adjusting the left and right position of the base frame 35. Example 3:

[0075] The serpentine tube automatic bending machine and bending method of Examples 1 and 2 with left and right rotating units arranged in front and back were used to bend the serpentine tube, and compared with two existing serpentine tube automatic bending machines with integrated feeding and bending. The results are as follows:

[0076]

[0077] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A serpentine tube automatic bending machine with left and right rotating units arranged in front and behind, characterized in that: The invention comprises a feeding station and two pipe bending stations which are arranged in sequence from back to front in the front-rear direction of pipe feeding, wherein the two pipe bending stations comprise a first rotary pipe bending station which is arranged in front of the feeding station in the front-rear direction and a second rotary pipe bending station which is arranged in front of the first rotary pipe bending station, and a feeding unit which is used to alternately convey the part of the pipe to be bent to the first rotary pipe bending station and the second rotary pipe bending station in the front-rear direction. One of the first rotary pipe bending station and the second rotary pipe bending station which are arranged in the front-rear direction A left-handed pipe bending machine unit for realizing left-hand bending of the pipe is provided on the first rotational pipe bending station and the second rotational pipe bending station arranged along the front-to-back direction, and a right-handed pipe bending machine unit for realizing right-hand bending of the pipe is provided on the other of the first rotational pipe bending station and the second rotational pipe bending station arranged along the front-to-back direction; when working, the feeding unit transports the various parts of the pipe to be bent alternately to the left-handed pipe bending machine unit and the right-handed pipe bending machine unit in turn along the front-to-back direction to realize alternating left-hand and right-hand bending of the pipe; the left-handed pipe bending machine unit and the right-handed pipe bending machine unit are both lifting-type top-up bending machine units.

2. The serpentine automatic pipe bender with left-right rotating units arranged in front and back according to claim 1, characterized in that: The feeding unit includes a material rack, a pair of parallel and spaced guide rails arranged on the material rack, and a numerically controlled automatic feeding trolley arranged on the guide rails and moving along the front-rear direction.

3. The serpentine automatic pipe bender with left-right rotating units arranged in front and back according to claim 2, characterized in that: The lifting type upsetting pipe bending machine unit includes a lifting seat, a rotating arm rotatably arranged on the lifting seat, a bending pipe mold arranged at the rotation center of the rotating arm, a pipe tightening assembly at the mold arranged on the rotating arm for tightening or loosening the pipe abutting on the bending pipe mold, a transverse moving seat arranged on the lifting seat that moves in the left and right directions, a longitudinal boosting plate arranged on the transverse moving seat that moves in the front and back directions, and a plate arranged on the longitudinal boosting plate for tightening or loosening the pipe abutting on the longitudinal boosting plate. The tube tightening assembly at the assisting position for tightening or loosening the tube on the template; the longitudinal assisting templates in the left-hand pipe bending unit and the right-hand pipe bending unit have opposite surfaces in the left and right directions in contact with the tube; wherein, the supporting surface of the longitudinal assisting template on the left-hand pipe bending unit is arranged to the left, and the supporting surface of the longitudinal assisting template on the right-hand pipe bending unit is arranged to the right, or the supporting surface of the longitudinal assisting template on the left-hand pipe bending unit is arranged to the right, and the supporting surface of the longitudinal assisting template on the right-hand pipe bending unit is arranged to the left.

4. The serpentine automatic pipe bender with left-right rotating units arranged in front and back according to claim 2, characterized in that: A number of floating bracket assemblies for supporting the pipes are arranged at intervals along the front-to-back direction on the material rack between a pair of guide rails. The floating bracket assemblies include a swing block rotatably arranged on the material rack via a hinge shaft. The upper part of the swing block is in the shape of a triangular head, and a roller for supporting the pipe is arranged at the position of the upper triangular head of the swing block. Tension springs are respectively connected to the front and rear sides of the lower end of the swing block.

5. The serpentine automatic pipe bender with left-right rotating units arranged in front and back according to claim 4, characterized in that: When the CNC automatic feeding trolley moves back and forth on the guide rail of the material rack, the triangular head of the swing block is pushed by the CNC automatic feeding trolley and swings to a certain angle to make way for the CNC automatic feeding trolley and allow the CNC automatic feeding trolley to pass smoothly over the swing block; after the CNC automatic feeding trolley passes smoothly over the swing block, the swing block swings back to its original position under the action of the balancing force of the tension spring.

6. The serpentine automatic pipe bender with left-right rotating units arranged in front and back according to claim 3, characterized in that: The bent tube mold is an upper and lower opening and closing mold, and the upper and lower opening and closing mold is realized by an opening and closing mechanism; the lifting seat is moved up and down by a lifting cylinder, the transverse moving seat is moved left and right by a transverse moving cylinder, and the longitudinal boosting template is moved longitudinally in the front and rear direction by a longitudinal boosting cylinder; the rotating arm is rotated by a rotating drive mechanism.

7. The serpentine automatic pipe bender with left-right rotating units arranged in front and back according to claim 2, characterized in that: The CNC automatic feeding trolley realizes longitudinal movement along the guide rail through a gear rack transmission mechanism driven by a first servo motor; the CNC automatic feeding trolley is provided with a worm gear transmission box driven by a second servo motor, and a spring chuck for clamping and loosening the pipe is provided on the hollow output shaft of the worm gear transmission box, and the spring chuck is clamped or loosened by a lever-type fork driven by a clamping cylinder.

8. A pipe bending method using a serpentine pipe automatic bending machine with left-right rotating units arranged in front and behind as claimed in any one of claims 1 to 7, characterized in that: The steps include: (1) Loading: Load the pipe onto the roller of the floating bracket assembly of the material rack, and make the pipe pass through the hollow output shaft of the CNC automatic feeding trolley; (2) Tube feeding: Start the CNC automatic feeding trolley and feed the part of the tube to be bent to the first rotary tube bending station in the front-to-back direction; (3) First rotational bending: Start the bending unit on the first rotational bending station located in front of the feeding station and behind the second rotational bending station to bend the pipe 180 degrees in the first rotational direction; (4) Tube feeding: Start the CNC automatic feeding trolley and feed the next part of the tube to be bent in the front-to-back direction to the second rotary bending station located in front of the first rotary bending station; (5) Second rotational bending: Start the bending unit on the second rotational bending station located in front of the first rotational bending station to perform the second rotational 180-degree bending of the pipe; (6) Alternating bending: Repeat steps (2) to (5) to achieve automatic continuous bending of the serpentine tube; The bending direction of the first 180-degree bend is opposite to the bending direction of the second 180-degree bend; Among them, when the pipe bending unit on the first rotational pipe bending station is a left-handed pipe bending unit, the bending direction of the first rotational 180-degree bend is a 180-degree left-hand bend; when the pipe bending unit on the first rotational pipe bending station is a right-handed pipe bending unit, the bending direction of the first rotational 180-degree bend is a 180-degree right-hand bend; Among them, when the pipe bending unit on the second rotational pipe bending station is a left-handed pipe bending unit, the bending direction of its second rotational 180-degree bend is a 180-degree left-handed bend; when the pipe bending unit on the second rotational pipe bending station is a right-handed pipe bending unit, the bending direction of its second rotational 180-degree bend is a 180-degree right-handed bend.

9. The pipe bending method of a serpentine pipe automatic bending machine with left-right rotating units arranged in front and back according to claim 8, characterized in that: The feeding action of the CNC automatic feeding trolley includes the retreat of the CNC automatic feeding trolley when the spring chuck is released and the forward conveyance of the pipe when the spring chuck is clamped; the bending action of the pipe bending unit includes the bending action in the first half cycle and the reset action after the bending in the second half cycle. The first half cycle of the pipe bending action includes, in sequence, the lifting seat rising to the pipe bending position, the pipe tightening assembly at the tire mold tightening the pipe, the lateral movable seat moving in the left and right directions toward the pipe so that the longitudinal boosting template on the lateral movable seat is in close contact with the pipe, the pipe tightening assembly at the boosting position tightening the pipe, and the longitudinal boosting template cooperating with the longitudinal boosting template along the front-to-back direction while the rotating arm rotates; The bending action in the second half of the cycle includes, in sequence, the loosening of the tube pressing assembly at the tire mold, the loosening of the tube pressing assembly at the auxiliary push, the resetting of the lateral movable seat in the reverse direction, the loosening of the upper and lower opening and closing tire molds, the resetting of the longitudinal auxiliary push plate in the reverse direction, the downward movement of the lifting seat out of the bending position and resetting, the closing and resetting of the upper and lower opening and closing tire molds, and the resetting of the rotating arm in the reverse direction. The CNC automatic feeding trolley utilizes the time when the pipe bending unit is performing the first half cycle of the pipe bending action to complete the retreat of the spring chuck when the pipe is loosened; the CNC automatic feeding trolley utilizes the time when the pipe bending unit is performing the second half cycle of the pipe bending action to complete the spring chuck when the pipe is clamped to deliver the pipe to the part to be bent to another pipe bending unit; Among them, when the CNC automatic feeding trolley is feeding the pipe, the roller on the swing block of the floating bracket assembly supports the pipe, and the floating bracket assembly uses its elastic swing structure to move away from the CNC automatic feeding trolley and automatically adapt to the linear error of the extra-long pipe to prevent the pipe from hanging in the air.

Images