Automatic pipe bending machine and machining method thereof

Abstract

The invention discloses an automatic pipe bending machine and a machining method thereof. The automatic pipe bending machine comprises a workbench and table legs fixed to the lower surface of the workbench and used for supporting the workbench. A driving motor is fixed to the lower end face of the workbench through bolts, the output end of the driving motor is fixed to the lower end of a main shaft, the upper end of the main shaft penetrates through the workbench to be fixed to a rotating wheel, and a second bending block is arranged on the outer side of the rotating wheel. According to the automatic pipe bending machine and the machining method thereof, a tool does not need to be used for disassembling the second bending block, the disassembling process is simple, convenient, time-saving and labor-saving, meanwhile, limiting of a plug pin is completed through clamping between a trapezoidal block and a clamping hole, then the stability of the plug pin during use is guaranteed, and in the working process of the pipe bending machine, the working efficiency is improved. According to the pipe fitting bending device, the bolts are not prone to loosening, different positions of the same pipe fitting can be bent conveniently, good practicability is achieved, meanwhile, the pipe fitting bending device can be suitable for pipe fittings of different diameters, and then the pipe fittings of different diameters can be limited conveniently.

Description

Technical Field

[0001] The invention relates to the technical field of pipe bending machines, in particular to an automatic pipe bending machine and a processing method thereof. Background Art

[0002] In the processing of pipe fittings, the pipe fittings need to be bent according to actual use requirements, so a pipe bending machine is needed to bend the pipe fittings to form pipe fittings with a preset bending structure. For example, in the application number "CN202311061402.8" and the patent number "Pipe Bending Machine", one end of the pipe fitting to be bent is facing the bending mechanism, and the other end is clamped on the pneumatic clamp; the screw motor is started to move the pipe feeding base along the No. 3 guide rail toward the direction of the bending mechanism, and the pneumatic clamp then drives the pipe fitting to move toward the direction of the bending mechanism. The end of the pipe to be bent passes through the positioning mechanism and enters the bending space of the bending mechanism. At this time, the pipe is supported on the lower bending wheel (not in contact with the upper bending wheel); the screw motor is continued to be started, and the positioning cylinder is started to retract the piston rod of the positioning cylinder. The rotating plate then rotates clockwise along the hinge seat, and then the clamping seat is driven by the linkage rod to move along the No. 1 guide rail toward the bending mechanism, so that the arc groove can be clamped on the pipe to position the pipe. However, the following problems still exist in actual use: The bending mechanism of the pipe bender will have a certain amount of wear after being used for a period of time. In order to ensure the bending effect and avoid damage to the pipe fittings, it needs to be replaced. However, when the bending mechanism needs to be replaced in the above structure, workpiece auxiliary replacement is required, and the disassembly process is cumbersome and complicated, which not only affects the bending efficiency, but also is time-consuming and labor-intensive. In addition, although some methods using latches are simple, the latches are not limited, which leads to the pins being easily loosened by external forces during the use of the pipe bender, thereby affecting the loosening of the bending mechanism and affecting the bending of the pipe fittings.

[0003] Therefore, we proposed an automatic pipe bending machine and its processing method which can solve the above problems well. Summary of the invention

[0004] The object of the present invention is to provide an automated pipe bending machine and a processing method thereof, so as to solve the problem raised by the above-mentioned background technology that when the bending mechanism needs to be replaced in the current market, workpiece auxiliary replacement is required, and the disassembly process is cumbersome and complicated, which not only affects the bending efficiency, but also is time-consuming and labor-intensive. In addition, although some methods using latches are simple, the latches are not limited, which leads to the latches being easily loosened by external forces during the use of the pipe bending machine, thereby affecting the loosening of the bending mechanism and affecting the bending of the pipe fittings.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automated pipe bending machine and a processing method thereof, comprising a workbench and table legs fixed to the lower surface of the workbench for supporting the workbench; It also includes: a driving motor is bolted to the lower end surface of the workbench, and the output end of the driving motor is fixed to the lower end of the main shaft, and the upper end of the main shaft passes through the workbench and is fixed to the rotating wheel, and a second bending block is arranged on the outer side of the rotating wheel; A plug plate is fixed on one side of the second bending block, and the plug plate is plugged into the rotating wheel. A plug pin is plugged into the upper surface of the rotating wheel, and the lower end of the plug pin extends into the rotating wheel. The lower end of the plug pin passes through the plug plate, and a clamping hole is opened on the outer side of the plug pin. A trapezoidal block is engaged inside the clamping hole, and the trapezoidal block is elastically slidably connected to the rotating wheel through a tension spring, and the two ends of the tension spring are respectively fixed to the rotating wheel and the trapezoidal block, and the upper front side of the trapezoidal block is in contact with the lower end of the pull rod; The pull rod is arranged on the upper end surface of the rotating wheel, and the pull rod is elastically slidably connected to the rotating wheel through a reset spring, and the two ends of the reset spring are respectively fixed to the rotating wheel and the pull rod, and the elastic force of the reset spring is greater than the elastic force of the tension spring.

[0006] Preferably, a connecting plate is fixed to the outer side surface of the main shaft, and the front end of the connecting plate is fixed to the movable plate. The movable plate is arranged on the upper surface of the workbench, and a sliding connection structure is formed between the movable plate and the arc groove opened on the upper surface of the workbench.

[0007] Preferably, a first cylinder is fixed to the upper surface of the movable plate, and the upper end of the first cylinder is fixedly connected to the second cylinder, and the output end of the second cylinder is fixed to the first bending block, and the first bending block and the second bending block are arranged in a symmetrical structure.

[0008] Preferably, a supporting foot is fixed on the right side of the upper surface of the workbench, and the upper end of the supporting foot is fixedly connected to the lower end surface of the mounting plate, and a servo motor is bolted to the front side surface of the mounting plate.

[0009] Preferably, the output end of the servo motor is fixed to one end of the first bidirectional screw, and the other end of the first bidirectional screw extends to the inside of the mounting plate and forms a bearing connection with the mounting plate, and the outer side surface of the first bidirectional screw is bolted with a sliding block.

[0010] Preferably, the upper end of the sliding block extends out of the upper end surface of the mounting plate and is fixed to the lower end surface of the fixing block, and a semicircular groove is provided on the inner side of the fixing block.

[0011] Preferably, a third cylinder is also installed on the right side of the upper end surface fixing block of the mounting plate, and the output end of the third cylinder is fixed to the cylinder, and a gear ring is rotatably provided on the outer side surface of the cylinder, and the inner side of the gear ring is meshed with the gear.

[0012] Preferably, the gears are arranged in four groups, and a second bidirectional screw is fixed in the middle of each of the four groups of gears, and both ends of the second bidirectional screw are connected to cylindrical bearings, and the outer side surface of each group of second bidirectional screws is threadedly connected with two groups of connecting sliders.

[0013] Preferably, one side of the connecting slider is rotatably connected to one end of the connecting rod, and the other end of the connecting rod is rotatably connected to the arc plate, and four groups of arc plates are provided, and the arc plates are arranged on the inner side of the cylinder.

[0014] Another technical solution provided by the present invention is to provide a processing method of an automated pipe bending machine, which is characterized by comprising the following steps: S1: The pipe fitting is placed between the first bending block, the second bending block and the fixed block. The first bending block can be driven to approach the second bending block through the second cylinder, and then contact the pipe fitting. At the same time, the servo motor can be started to clamp the pipe fitting through the first bidirectional screw rod, and then the pipe fitting is limited to avoid displacement during bending. S2: Place one end of the pipe fitting in the cylinder at the same time, and rotate the gear ring, so that the four sets of gears and the second bidirectional screw drive the arc plate to contact the pipe fitting through the connecting rod, and limit the pipe fitting; S3: By starting the driving motor, the driving motor not only drives the rotating wheel and the second bending block to rotate through the main shaft, but also drives the second cylinder and the first bending block to rotate synchronously through the connecting plate, thereby bending the pipe through the cooperation between the first bending block and the second bending block; S4: When the bending is completed, the driving motor can be reversed to drive the first bending block and the second bending block to reset; S5: At this time, the third cylinder can be started, and the third cylinder drives the cylinder and the pipe inside it to continue to move to the left, thereby pushing the pipe to the left and changing the bending point; S6: When the pipe is moved to the position where bending is required, the operation of S3 can be repeated to complete the automatic bending of the pipe.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the automatic pipe bending machine and the processing method thereof not only do not need to use tools to disassemble the second bending block, but also the disassembly process is simple and convenient, saving time and effort. At the same time, the latch is limited by the engagement between the trapezoidal block and the clamping hole, thereby ensuring its stability during use. During the operation of the pipe bending machine, the latch will not be easily loosened, and it is convenient to bend different positions of the same pipe fitting. It not only has good practicality, but also can be applied to pipe fittings of different diameters, thereby facilitating the limiting of pipe fittings of different diameters, and has good practicality. The specific contents are as follows: By pulling the pull rod upward, the lower end of the pull rod no longer squeezes the trapezoidal block. At this time, the tension spring can pull the other end of the trapezoidal block to separate from the clamping hole, thereby releasing the limit on the clamping hole, and then releasing the limit between the latch pin and the plug plate. At this time, the second bending block can be taken down, and the second bending block does not need to be disassembled using tools, and the disassembly process is simple and convenient, saving time and effort; Furthermore, the latch is limited by the engagement between the trapezoidal block and the card hole, thereby ensuring its stability during use. During the operation of the pipe bending machine, the latch will not loosen easily, thereby enabling the second bending block to bend the pipe better. At the same time, the elastic force of the reset spring is greater than the tension spring, so the pull rod can keep the trapezoidal block always engaged with the card hole through the extrusion force. The main shaft is driven to rotate by the driving motor, so that the main shaft drives the connecting plate to rotate together, so that the connecting plate drives the first cylinder and the second cylinder to move together, so that the second cylinder drives the first bending block to always contact with the second bending block. At this time, the second bending block cooperates with the first bending block to bend the pipe fitting, thereby realizing the automation of pipe fitting bending; Furthermore, the servo motor drives the first bidirectional screw to rotate, so that the first bidirectional screw drives the two sets of sliding blocks to approach each other, and the sliding blocks drive the fixed blocks to approach each other, so that the fixed blocks clamp and limit the pipe fittings, so that the rear end of the pipe fittings will not be displaced during the bending process, thereby ensuring that the bending work of the pipe fittings is carried out normally; (3) The gear and the second bidirectional screw are rotated, and the second bidirectional screw is rotated, and the arc plate is driven to move by connecting the slider and the connecting rod, so that the connecting rod can approach and clamp the pipe fitting to limit the position, so as to facilitate bending different positions of the same pipe fitting. It not only has good practicality, but also can be applied to pipe fittings of different diameters, so as to facilitate the limiting of pipe fittings of different diameters, and has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a bottom view structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of a partial cross-sectional structure of the present invention; Figure 4 For the present invention Figure 3 The enlarged structural diagram at A in the middle; Figure 5 It is a schematic diagram of the cross-section top view of the mounting plate of the present invention; Figure 6 This is a schematic diagram of the cross-section of the mounting plate of the present invention; Figure 7 This is a schematic diagram of the front view of the structure of the connection between the third cylinder and the cylinder of the present invention; Figure 8 This is a schematic diagram of the front view of the meshing structure of the gear ring and the gear of the present invention; Fig. 9 It is a schematic diagram of the rear view structure of the meshing ring gear and gear of the present invention.

[0017] In the figure: 1. workbench; 2. driving motor; 3. spindle; 4. rotating wheel; 5. connecting plate; 6. moving plate; 7. arc groove; 8. first cylinder; 9. second cylinder; 10. first bending block; 11. second bending block; 12. plug plate; 13. latch; 14. clamping hole; 15. trapezoidal block; 16. tension spring; 17. pull rod; 18. reset spring; 19. supporting foot; 20. mounting plate; 21. servo motor; 22. first bidirectional lead screw; 23. sliding block; 24. fixed block; 25. third cylinder; 26. cylinder; 27. gear ring; 28. gear; 29. ​​second bidirectional lead screw; 30. connecting slider; 31. connecting rod; 32. arc plate. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 7 , the present invention provides the following technical solutions: Embodiment 1: In order to solve the problem in the prior art that when the bending mechanism needs to be replaced, it is necessary to use workpiece auxiliary replacement, and the disassembly process is cumbersome and complicated, which not only affects the bending efficiency, but also is time-consuming and labor-intensive. In addition, although some methods using the latch 13 are simple, the latch 13 is not limited, which leads to the latch 13 being easily loosened by external force during the use of the pipe bending machine, thereby affecting the loosening of the bending mechanism and affecting the bending of the pipe fitting. Therefore, the following scheme is disclosed, including a workbench 1 and a table leg fixed to the lower surface of the workbench 1 for supporting the workbench 1; it also includes: a driving motor 2 is fixed to the lower end surface of the workbench 1 with bolts, and the output end of the driving motor 2 is fixed to the lower end of the main shaft 3, and the upper end of the main shaft 3 passes through the workbench 1 and is fixed to the rotating wheel 4, and a second bending block 11 is arranged on the outer side of the rotating wheel 4; the second bending A plug plate 12 is fixed to one side of the block 11, and the plug plate 12 is plugged with the rotating wheel 4, and a plug pin 13 is plugged with the upper surface of the rotating wheel 4, and the lower end of the plug pin 13 extends into the rotating wheel 4, and the lower end of the plug pin 13 passes through the plug plate 12, and a clamping hole 14 is provided on the outer side of the plug pin 13; a trapezoidal block 15 is clamped inside the clamping hole 14, and the trapezoidal block 15 is elastically slidably connected with the rotating wheel 4 through a tension spring 16, and the two ends of the tension spring 16 are respectively fixed to the rotating wheel 4 and the trapezoidal block 15, and the upper front side of the trapezoidal block 15 is in contact with the lower end of the pull rod 17; the pull rod 17 is arranged on the upper end surface of the rotating wheel 4, and the pull rod 17 is elastically slidably connected with the rotating wheel 4 through a reset spring 18, and the two ends of the reset spring 18 are respectively fixed to the rotating wheel 4 and the pull rod 17, and the elastic force of the reset spring 18 is greater than the elastic force of the tension spring 16; When the second bending block 11 on the rotating wheel 4 needs to be replaced, it is only necessary to pull the pull rod 17 upwards, so that the lower end of the pull rod 17 no longer squeezes the trapezoidal block 15. At this time, the tension spring 16 can pull the trapezoidal block 15 to move to the right, so that the other end of the trapezoidal block 15 is separated from the clamping hole 14, thereby releasing the limit on the clamping hole 14, and the latch 13 can be pulled out at this time, so that the limit between the latch 13 and the plug plate 12 is released, and the second bending block 11 can be taken down at this time, and then there is no need to use tools to disassemble the second bending block 11, and the disassembly process is simple and convenient, saving time and effort, and only the new second bending block 11 and the plug plate 12 need to be inserted into the rotating wheel 4, and then the latch 13 is inserted, so that the latch 1 3 and the plug plate 12 form a snap connection, and then the pull rod 17 is released. At this time, the elastic force of the reset spring 18 can drive the pull rod 17 to reset downward, so that the pull rod 17 resets downward and squeezes the trapezoidal block 15, so that the trapezoidal block 15 is forced to slide to the left, so that the left end of the trapezoidal block 15 is drawn into the clamping hole 14, thereby completing the limit of the latch 13, thereby ensuring its stability during use. During the operation of the pipe bending machine, the latch 13 will not be easily loosened, so that the second bending block 11 can bend the pipe better. At the same time, the elastic force of the reset spring 18 is greater than the tension spring 16, so the pull rod 17 can keep the trapezoidal block 15 always in the clamping effect with the clamping hole 14 through the extrusion force; Embodiment 2: Different from Embodiment 1, this embodiment realizes the automation of pipe bending. Figure 1-Figure 3 and Figure 5 A connecting plate 5 is fixed to the outer side surface of the main shaft 3, and the front end of the connecting plate 5 is fixed to the moving plate 6. At the same time, the moving plate 6 is arranged on the upper surface of the workbench 1, and a sliding connection structure is formed between the moving plate 6 and the arc groove 7 opened on the upper surface of the workbench 1. A first cylinder 8 is fixed to the upper surface of the moving plate 6, and the upper end of the first cylinder 8 is fixedly connected to the second cylinder 9, and the output end of the second cylinder 9 is fixed to the first bending block 10, and the first bending block 10 and the second bending block 11 are arranged in a symmetrical structure. A supporting foot 19 is fixed to the right side of the upper surface of the workbench 1, and The upper end of the support foot 19 is fixedly connected to the lower end surface of the mounting plate 20, and the front side surface of the mounting plate 20 is bolted with a servo motor 21, the output end of the servo motor 21 is fixed to one end of a first bidirectional screw rod 22, and the other end of the first bidirectional screw rod 22 extends to the inside of the mounting plate 20 and forms a bearing connection with the mounting plate 20, and the outer side surface of the first bidirectional screw rod 22 is bolted with a sliding block 23, and the upper end of the sliding block 23 extends out of the upper end surface of the mounting plate 20 and is fixed to the lower end surface of the fixing block 24, and the inner side of the fixing block 24 is provided with a semicircular groove; Moreover, through the setting of the first cylinder 8, the second cylinder 9 and the first bending block 10 can be driven to rise to be parallel to the second bending block 11. At this time, the second cylinder 9 can drive the first bending block 10 to approach the second bending block 11, so that the second bending block 11 and the first bending block 10 clamp the pipe fitting. At this time, it is only necessary to start the driving motor 2, so that the driving motor 2 drives the main shaft 3 to rotate, and through the rotation of the main shaft 3, it drives the upper end of the rotating wheel 4 to rotate together, so that it drives the first bending block 10 to rotate together. At the same time, when the main shaft 3 rotates, it also drives the connecting plate 5 to rotate together, so that when the connecting plate 5 rotates, it drives the movable plate 6 to slide in the arc groove 7, so that the movable plate 6 drives the first cylinder 9 to rotate. The cylinder 8 moves together with the second cylinder 9, so that the second cylinder 9 drives the first bending block 10 to always contact the second bending block 11. At this time, the second bending block 11 cooperates with the first bending block 10 to bend the pipe, thereby realizing the automation of pipe bending. The servo motor 21 is started, so that the servo motor 21 drives the first bidirectional screw rod 22 to rotate, so that the first bidirectional screw rod 22 drives the two sets of sliding blocks 23 to approach each other, so that the sliding block 23 drives the fixed fixed block 24 to approach each other, so that the fixed block 24 clamps and limits the pipe, so that the rear end of the pipe will not be displaced during the bending process, thereby ensuring that the bending work of the pipe is carried out normally. Embodiment 3: Different from Embodiment 2, this embodiment can be applied to pipes of different diameters, thereby facilitating the positioning of pipes of different diameters, and has good practicality. Figure 5-Figure 9 , a third cylinder 25 is also installed on the right side of the upper end surface fixing block 24 of the mounting plate 20, and the output end of the third cylinder 25 is fixed to the cylinder 26, and a gear ring 27 is rotatably provided on the outer side surface of the cylinder 26, and the inner side of the gear ring 27 is meshed with a gear 28, four groups of gears 28 are provided, and a second bidirectional screw rod 29 is fixed in the middle of the four groups of gears 28, and both ends of the second bidirectional screw rod 29 are connected to the cylinder 26 bearing, and the outer side surface of each group of second bidirectional screw rods 29 is threadedly connected with two groups of connecting sliders 30, one side of the connecting slider 30 is rotatably connected to one end of the connecting rod 31, and the other end of the connecting rod 31 is rotatably connected to the arc plate 32, and four groups of arc plates 32 are provided, and the arc plate 32 is arranged on the inner side of the cylinder 26; At the same time, one end of the pipe is placed in the cylinder 26, and the gear ring 27 can be rotated at this time, so that the gear ring 27 drives the four sets of gears 28 to rotate, and the gear 28 drives the second bidirectional screw 29 fixed in the middle to rotate together, so that the second bidirectional screw 29 rotates and drives the two sets of connecting sliders 30 threadedly connected on the outer side thereof to move away from each other, and when the connecting slider 30 moves, it also drives one end of the connecting rod 31 connected to it for rotation to move together, and the other end of the connecting rod 31 is moved between the arc plate 32. The rotating connection formed allows the connecting rod 31 to drive the arc plate 32 to move, so that the connecting rod 31 can approach and clamp the pipe fitting to limit the position. Subsequently, during the bending process, the third cylinder 25 can be controlled by the numerical control system to drive the cylinder 26 to move forward, so that the cylinder 26 drives the pipe fitting inside it to move together, thereby facilitating the bending of different positions of the same pipe fitting. It not only has good practicality, but can also be applied to pipe fittings of different diameters, thereby facilitating the limiting of pipe fittings of different diameters, and has good practicality.

[0020] In order to better demonstrate the processing method of the automatic pipe bending machine, in this embodiment, a processing method of the automatic pipe bending machine includes the following steps: Step 1: Place the pipe between the first bending block 10, the second bending block 11 and the fixed block 24. The second cylinder 9 can drive the first bending block 10 to approach the second bending block 11, and then contact the pipe. At the same time, start the servo motor 21 to clamp the pipe through the first bidirectional screw rod 22, and then limit the pipe to avoid displacement during bending. Step 2: Place one end of the pipe in the cylinder 26 at the same time, and rotate the gear ring 27, so that the four sets of gears 28 and the second bidirectional screw 29 drive the arc plate 32 to contact the pipe through the connecting rod 31, and limit the pipe; Step 3: By starting the driving motor 2, the driving motor 2 can not only drive the rotating wheel 4 and the second bending block 11 to rotate through the main shaft 3, but also drive the second cylinder 9 and the first bending block 10 to rotate synchronously through the connecting plate 5, and then the pipe is bent through the cooperation between the first bending block 10 and the second bending block 11; Step 4: When the bending is completed, the first bending block 10 and the second bending block 11 can be reset by driving the motor 2 to reverse; Step 5: At this time, the third cylinder 25 can be started, and the third cylinder 25 drives the cylinder 26 and the pipe inside it to continue to move to the left, thereby pushing the pipe to the left and changing the bending point; Step 6: When it moves to the position where bending is required, the operation of S3 can be repeated to complete the automatic bending of the pipe.

[0021] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0022] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automated pipe bending machine, comprising a workbench (1) and table legs fixed to the lower surface of the workbench (1) for supporting the workbench (1); It is characterized in that Also includes: The lower end surface of the workbench (1) is bolted with a driving motor (2), and the output end of the driving motor (2) is fixed to the lower end of the main shaft (3), and the upper end of the main shaft (3) passes through the workbench (1) and is fixed to the rotating wheel (4), and a second bending block (11) is arranged on the outer side of the rotating wheel (4); A plug plate (12) is fixed on one side of the second bending block (11), and the plug plate (12) is plugged into the rotating wheel (4), and a plug pin (13) is plugged into the upper surface of the rotating wheel (4), and the lower end of the plug pin (13) extends into the rotating wheel (4), and the lower end of the plug pin (13) passes through the plug plate (12), and a clamping hole (14) is provided on the outer side surface of the plug pin (13); A trapezoidal block (15) is engaged inside the clamping hole (14), and the trapezoidal block (15) is elastically slidably connected to the rotating wheel (4) via a tension spring (16), and the two ends of the tension spring (16) are respectively fixed to the rotating wheel (4) and the trapezoidal block (15), and the upper front side surface of the trapezoidal block (15) is in contact with the lower end of the pull rod (17); The pull rod (17) is arranged on the upper end surface of the rotating wheel (4), and the pull rod (17) is elastically slidably connected to the rotating wheel (4) through a return spring (18), and the two ends of the return spring (18) are respectively fixed to the rotating wheel (4) and the pull rod (17), and the elastic force of the return spring (18) is greater than the elastic force of the tension spring (16).

2. The automatic pipe bending machine according to claim 1, characterized in that: A connecting plate (5) is fixed to the outer side surface of the main shaft (3), and the front end of the connecting plate (5) is fixed to the movable plate (6). The movable plate (6) is arranged on the upper surface of the workbench (1), and a sliding connection structure is formed between the movable plate (6) and an arc groove (7) provided on the upper surface of the workbench (1).

3. The automatic pipe bending machine according to claim 2, characterized in that: A first cylinder (8) is fixed on the upper surface of the movable plate (6), and the upper end of the first cylinder (8) is fixedly connected to the second cylinder (9), and the output end of the second cylinder (9) is fixed to the first bending block (10), and the first bending block (10) and the second bending block (11) are arranged in a symmetrical structure.

4. The automatic pipe bending machine according to claim 1, characterized in that: A support foot (19) is fixed to the right side of the upper surface of the workbench (1), and the upper end of the support foot (19) is fixedly connected to the lower end surface of the mounting plate (20), and a servo motor (21) is bolted to the front side of the mounting plate (20).

5. The automatic pipe bending machine according to claim 4, characterized in that: The output end of the servo motor (21) is fixed to one end of the first bidirectional screw rod (22), and the other end of the first bidirectional screw rod (22) extends to the inside of the mounting plate (20) and forms a bearing connection with the mounting plate (20), and the outer side surface of the first bidirectional screw rod (22) is bolted to a sliding block (23).

6. The automatic pipe bending machine according to claim 5, characterized in that: The upper end of the sliding block (23) extends out of the upper end surface of the mounting plate (20) and is fixed to the lower end surface of the fixing block (24), and a semicircular groove is provided on the inner side of the fixing block (24).

7. The automatic pipe bending machine according to claim 4, characterized in that: A third cylinder (25) is also installed on the right side of the upper end surface fixing block (24) of the mounting plate (20), and the output end of the third cylinder (25) is fixed to the cylinder (26), and a gear ring (27) is rotatably provided on the outer side surface of the cylinder (26), and the inner side of the gear ring (27) is meshed with a gear (28).

8. The automatic pipe bending machine according to claim 7, characterized in that: The gears (28) are provided in four groups, and a second bidirectional screw rod (29) is fixed in the middle of each of the four groups of gears (28), and both ends of the second bidirectional screw rod (29) are connected to the bearing of the cylinder (26), and the outer side surface of each group of the second bidirectional screw rod (29) is threadedly connected with two groups of connecting sliders (30).

9. The automatic pipe bending machine according to claim 8, characterized in that: One side of the connecting slider (30) is rotatably connected to one end of the connecting rod (31), and the other end of the connecting rod (31) is rotatably connected to the arc plate (32), and four groups of the arc plates (32) are provided, and the arc plates (32) are arranged on the inner side of the cylinder (26).

10. A processing method of an automated pipe bending machine as claimed in claim 1, characterized in that: The steps include: S1: The pipe fitting is placed between the first bending block (10), the second bending block (11) and the fixing block (24), and the first bending block (10) is driven by the second cylinder (9) to approach the second bending block (11) and thus contact the pipe fitting. At the same time, the servo motor (21) is started to clamp the pipe fitting by the fixing block (24) through the first bidirectional screw rod (22), thereby limiting the position of the pipe fitting and preventing displacement during bending; S2: simultaneously placing one end of the pipe fitting in the cylinder (26), and rotating the gear ring (27), thereby causing the four sets of gears (28) and the second bidirectional screw rod (29) to drive the arc plate (32) to contact the pipe fitting through the connecting rod (31), and limit the position of the pipe fitting; S3: By starting the driving motor (2), the driving motor (2) can not only drive the rotating wheel (4) and the second bending block (11) to rotate through the main shaft (3), but also drive the second cylinder (9) and the first bending block (10) to rotate synchronously through the connecting plate (5), thereby bending the pipe fitting through the cooperation between the first bending block (10) and the second bending block (11); S4: When the bending is completed, the driving motor (2) can be reversed to drive the first bending block (10) and the second bending block (11) to reset; S5: At this time, the third cylinder (25) can be started, and the third cylinder (25) drives the cylinder (26) and the pipe inside it to continue to move to the left, thereby pushing the pipe to the left and changing the bending point; S6: When the pipe is moved to the position where bending is required, the operation of S3 can be repeated to complete the automatic bending of the pipe.

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