A pipe bending component for the production of stainless steel pipe fittings

Abstract

This invention relates to the field of pipe fitting manufacturing technology, specifically to a pipe bending component for stainless steel pipe fitting production. The component includes a rotating wheel and a mounting plate. A connecting shaft is coaxially fixedly mounted on the bottom of the rotating wheel. A slot adapted to the pipe fitting is provided on the side wall of the rotating wheel. The mounting plate has multiple bolt holes for fixed connection with external equipment and mounting holes for inserting the connecting shaft. A limiting groove is provided inside the mounting hole. A sliding groove is provided on the connecting shaft, and a locking block is slidably mounted inside the sliding groove. The locking block matches the limiting groove. A pushing component is also provided inside the connecting shaft. This invention mounts the rotating wheel on the mounting plate through an insertion method, improving the ease of mounting and dismounting the rotating wheel. Simultaneously, the pushing component pushes the locking block, allowing it to extend into the limiting groove, ensuring that the rotating wheel will not dislodge from the mounting hole due to equipment vibration during pipe bending, thus guaranteeing the stability and safety of the rotating wheel during use.

Description

Technical Field

[0001] This invention relates to the field of pipe fitting manufacturing technology, specifically to a pipe bending component for stainless steel pipe fitting manufacturing. Background Technology

[0002] Currently, stainless steel pipe fittings are widely used in production and daily life, such as as structural components of machinery or as decorative items. Whether in production or daily life, stainless steel pipe fittings often need to be bent to change their shape to meet design requirements.

[0003] In existing stainless steel pipe bending processes, bending components are typically used. These components are usually horizontally fixed rollers with annular grooves on their side walls that fit the pipe fitting. During bending, a pneumatic or hydraulic cylinder pushes the stainless steel pipe fitting and presses it into the grooves. Then, a motor drives the pneumatic or hydraulic cylinder to rotate around the roller's axis while holding the pipe fitting in place, thus bending the stainless steel pipe.

[0004] However, stainless steel pipes come in various diameters depending on the requirements. To prevent excessive deformation of the pipe during bending, which could affect its load-bearing capacity, the grooves of the bending component are usually matched to the pipe. However, this means that bending different types of pipes requires changing the bending component, i.e., changing the bending roller. Existing rollers are typically bolted to specific positions, making roller replacement cumbersome and affecting bending efficiency.

[0005] To address the cumbersome disassembly of pipe bending components, Chinese utility model patent application number 202322621161.X, entitled "A Pipe Bending Device for Stainless Steel Pipe Production," improved the pipe bending component. It includes a drive motor and a bending component. A mounting plate is fixedly sleeved on the output shaft of the drive motor. The bending component is slidably sleeved on the output shaft of the drive motor, and multiple insert blocks are circumferentially fixedly installed on the lower surface of the bending component. The upper surface of the mounting plate has multiple circumferentially formed mounting slots for inserting the insert blocks. During bending, the drive motor controls the movement of the sliding block, causing a pressing ring to move downwards. Simultaneously, the pressing ring presses down, controlling the insertion of multiple insert blocks into the mounting slots, thus restricting the vertical movement of the bending component and locking it in place. When the pipe is not being bent, a telescopic spring automatically ejects the insert blocks from the mounting slots, allowing workers to directly remove the bending component for replacement without removing bolts.

[0006] While the aforementioned patents have addressed the issue of cumbersome disassembly of pipe bending components to some extent, they rely on motor operation for locking. Since the motor reciprocates during bending, the insert blocks undergo an "insertion into the mounting slot – ejection from the mounting slot" motion with each reciprocating motion. During bending, the motor's rotation or vibrations of the hydraulic or pneumatic cylinders can cause misalignment between the insert blocks and the mounting slots. This can result in one or even all insert blocks failing to engage properly and lock the pipe bending component. Without this locking mechanism, the pipe bending component is prone to detachment during bending, leading to equipment malfunction or even a complete accident.

[0007] To address this, a pipe bending component for stainless steel pipe production is proposed, which improves the ease of assembly and disassembly of the pipe bending component while ensuring its stability during use. Summary of the Invention

[0008] The purpose of this invention is to provide a pipe bending component for the production of stainless steel pipe fittings, which resolves the contradiction between the difficulty of disassembling and the stability of installation of the pipe bending component, and improves the convenience of disassembly and assembly of the pipe bending component while ensuring the stability of the pipe bending component during use.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A pipe bending component for stainless steel pipe production includes a rotary wheel and a mounting plate. A connecting shaft is coaxially fixedly mounted on the bottom of the rotary wheel. A slot adapted to the pipe fitting is provided on the side wall of the rotary wheel. The mounting plate has multiple bolt holes for fixed connection with external equipment. The mounting plate has mounting holes for inserting the connecting shaft. A limiting groove is provided inside the mounting holes. A sliding groove is provided on the connecting shaft. The sliding groove is perpendicular to the axis of the connecting shaft. A locking block is slidably mounted inside the sliding groove. The locking block matches the limiting groove. A pushing component is also provided inside the connecting shaft for pushing the locking block away from the axis of the connecting shaft along the sliding groove.

[0011] After the mounting plate is pre-fixed in the designated position, the speed of assembly and disassembly of the roller is improved by the interaction between the connecting shaft on the roller and the mounting hole on the mounting plate. During use, the connecting shaft on the roller is directly inserted into the mounting hole for quick installation without removing bolts, improving the ease of assembly and disassembly. This facilitates quick replacement of the appropriate roller when bending pipe fittings of different diameters, increasing production speed. After the connecting shaft is inserted into the mounting hole, the control block is moved along the sliding groove by pushing the component. The block moves away from the axis of the connecting shaft and extends out of the sliding groove. The block extending out of the sliding groove enters the limiting groove, which restricts the block's up-and-down movement along the axis of the connecting shaft. This prevents the roller from dislodging from the mounting hole due to equipment vibration during pipe bending, improving the stability of the roller during the bending process.

[0012] The pushing component can be either a small motor inside the connecting shaft that pushes the locking block, or a spring that pushes the locking block. For example, the spring can keep pushing the locking block away from the connecting shaft, meaning initially the locking block extends outside the sliding groove under the spring's action, with the end of the locking block away from the connecting shaft axis rounded. When the connecting shaft is inserted into the mounting hole, the inner wall of the mounting hole compresses the locking block, causing it to retract into the sliding groove. The spring compresses, and when the locking block reaches the limit groove, the spring resets under its own elasticity, pushing the locking block into the limit groove, thus limiting the rotation wheel. To disassemble the rotation wheel, simply pull it upwards along the mounting hole axis, using the inner wall of the mounting hole to compress the rounded end of the locking block, causing it to retract into the sliding groove. This allows for quick removal of the rotation wheel from the mounting hole.

[0013] Preferably, the pushing assembly includes a vertical insertion hole penetrating the rotating wheel and the connecting shaft, the insertion hole being coaxial with the connecting shaft, the sliding groove communicating with the insertion hole, and a first spring disposed inside the sliding groove; the first spring is used to pull the locking block towards the insertion hole, and the first spring keeps the locking block fully retracted inside the sliding groove; an inclined pressing part is provided at one end of the locking block near the axis of the insertion hole, and the pressing part extends into the insertion hole; the pushing assembly also includes a rod for inserting into the insertion hole, the bottom of the rod being provided with a tapered part, and the top of the rod being provided with a limiting part for preventing the rod from fully extending into the insertion hole.

[0014] The locking block is initially held in place inside the sliding groove by the first spring. When installing the connecting shaft, the connecting shaft is directly inserted into the mounting hole, and then the insert rod is inserted into the insertion hole. The tapered part on the insert rod presses against the inclined pressing part on the locking block, eventually causing the locking block to move along the sliding groove away from the axis of the insertion hole. The first spring is compressed, and the locking block extends out of the sliding groove and enters the limiting groove. The limiting groove and the locking block cooperate to restrict the up and down movement of the connecting shaft and the rotating wheel, maintaining the stability of the rotating wheel during use.

[0015] Compared to motor-driven systems, the control method using a rod to move the locking block is simpler, with lower installation and maintenance costs and better stability. Compared to a spring-driven system that keeps the locking block extended, keeping it initially retracted within the sliding groove, and then extending it via the rod after alignment with the limiting groove, reduces wear on the mounting hole's inner wall when the connecting shaft is inserted into or removed. This prevents gaps from forming between the mounting hole's inner wall and the locking block due to wear, thus preventing the roller from wobbling during pipe bending and improving its stability during use. During roller disassembly, simply pulling out the rod allows the first spring to automatically retract the locking block back into the sliding groove, eliminating the need for the mounting hole's inner wall to press the block back in, saving effort and further ensuring ease of roller assembly and disassembly.

[0016] Preferably, the mounting plate is provided with an abutment block, and the abutment block is provided with an arc-shaped part. The circle of the arc-shaped part coincides with the center of the rotating wheel, and the arc-shaped part is in contact with the outer wall of the rotating wheel, and the outer wall of the rotating wheel slides in contact with the arc-shaped part.

[0017] After the connecting shaft is inserted into the mounting hole on the mounting plate, the arc-shaped part on the abutment block abuts against the outer wall of the roller. The abutment block provides support to the roller during the bending process of the pipe fitting, ensuring that the roller and connecting shaft are not damaged during bending and guaranteeing the stability and safety of the roller during use. Simultaneously, it provides a limit to the roller after long-term wear of the mounting hole or connecting shaft, preventing the roller from wobbling and further ensuring its stability during use.

[0018] Preferably, the mounting plate has a rotating groove, a turntable is rotatably mounted inside the rotating groove, an annular retaining ring is fixedly mounted inside the rotating groove, an annular groove is formed on the side wall of the turntable, and the retaining ring is engaged in the groove to restrict the up and down movement of the turntable; the mounting hole is formed on the turntable, and the abutment block is vertically fixedly mounted on the turntable.

[0019] Because different pipe fittings have different production requirements and bending angles, the abutment block, while supporting the rotating wheel and improving its stability, might interfere with the pipe fitting during bending if fixed to the mounting plate, thus affecting the bending process. By using a rotating plate, the abutment block is fixedly mounted on it and abuts against the rotating wheel, allowing it to rotate with the plate. When the pipe fitting is pressed against the side wall of the abutment block during bending, the fitting pushes the abutment block to rotate with the wheel, preventing it from interfering with the bending. Thus, the abutment block improves the strength of the rotating wheel and connecting shaft without affecting the bending of the pipe fitting.

[0020] Preferably, a support portion is provided on the side of the abutment block opposite to the arc-shaped portion. The support portion is a right-angled triangle, with one right-angled side of the support portion vertically fixed to the arc-shaped portion, and the other right-angled side of the support portion parallel to and in sliding contact with the upper surface of the mounting plate.

[0021] By utilizing the contact between the support and the upper surface of the mounting plate, the force can be further transferred to the mounting plate, further preventing damage to the turntable and connecting shaft. In addition, when dust or metal shavings accumulate on the surface of the mounting plate, the contact block can be rotated to scrape them off, preventing excessive accumulation of dust and metal shavings that could become stuck in the gap between the turntable and the rotating groove, thus affecting the turntable's rotation.

[0022] Preferably, the limiting groove is annular and the cross-section of the limiting groove is semi-circular, and a semi-circular guide portion is provided at the end of the card block away from the axis of the connecting shaft.

[0023] The annular limiting groove allows the locking block to align directly with the groove after it has reached the specified depth inside the mounting hole, eliminating the need to rotate the connecting shaft to find the alignment position and further improving the ease of assembly and disassembly. The guide section allows the connecting shaft to be pulled down by the pressure between the semi-circular guide section and the opening of the limiting groove when the insert rod is inserted into the insertion hole and pushes the locking block out of the sliding groove. This ensures complete alignment of the locking block with the limiting groove. The insertion of the insert rod into the insertion hole ensures that the locking block fully enters the limiting groove, further improving the stability of the roller during use and reducing the possibility of the connecting shaft detaching from the mounting hole due to the locking block not fully entering the limiting groove.

[0024] Preferably, the abutment block has a support platform and a horizontally formed sliding groove. The sliding groove is located above the support platform, and a slider is slidably installed inside the sliding groove. A second spring is provided inside the sliding groove to keep the slider horizontally extending out of the sliding groove. The top of the slider has an inclined ramp, and the bottom surface of the slider extending out of the sliding groove cooperates with the top surface of the support platform to form a horizontal clamping groove. The clamping groove is used to engage the limiting part to prevent the limiting part from moving up and down. The top of the abutment block also has a through groove that connects to the sliding groove. A pull rod is provided on the top of the slider, and the pull rod passes through the through groove and can slide along the through groove.

[0025] After the insertion rod is inserted into the socket, although the spring force of the first spring will not push the rod out of the socket because the axis of the first spring is perpendicular to the rod, the vibration of the motor during the bending of the pipe may cause the rod to move upward. When the bottom of the rod moves above the locking block, the first spring loses the compression of the rod and will cause the locking block to retract into the sliding groove. This may cause the roller to loosen due to the vibration of the motor, affecting the bending of the pipe. After setting the clamping groove, the limiting part can be inserted into the clamping groove to restrict the upward movement of the limiting part and the rod. The ramp on the slider can play a guiding role. When the limiting part is inserted into the clamping groove, simply insert the rod into the socket and press it downward. The bottom of the limiting part will squeeze the ramp into the sliding groove, without any other operation, ensuring the ease of installation of the rod. When it is necessary to remove the rod, simply pull the lever along the through groove to let the slider retract into the sliding groove to avoid the limiting part, and the rod can be removed upward.

[0026] Preferably, the limiting part is disc-shaped, and the sidewall of the disc-shaped limiting part abuts against the bottom of the clamping groove.

[0027] The disc-shaped limiting part ensures that it remains inside the clamping groove, preventing the abutment block from being pushed by the pipe fitting during bending and preventing the limiting part from disengaging from the clamping part after the abutment block rotates around the wheel, thus further ensuring the stability of the wheel. In addition, the fact that the side wall of the limiting part abuts against the bottom of the clamping groove also further improves the strength of the connecting shaft and the wheel.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1. The present invention provides a pipe bending component for stainless steel pipe production. Compared with existing pipe bending components, it utilizes an insert-type mounting method to install the roller on the mounting plate, improving the ease of roller assembly and disassembly. Simultaneously, it employs a method of mutual cooperation between the insert rod and the locking block, allowing the insert rod to insert into the insert hole and press against the locking block, causing the locking block to extend into the limiting groove. This ensures that the roller will not dislodge from the mounting hole due to equipment vibration during pipe bending, guaranteeing the stability and safety of the roller during use.

[0030] 2. The stainless steel pipe bending component of this invention also includes an abutment block on the mounting plate. This abutment block slides against the side wall of the roller, increasing the roller's strength during pipe bending and compensating for the insufficient strength of rollers installed using a snap-fit ​​method. Furthermore, the abutment block maintains the roller's stability even after long-term disassembly and wear of the mounting hole, preventing roller wobbling and further ensuring the roller's safety and stability during use.

[0031] 3. The stainless steel pipe bending component for production described in this invention is further provided with a turntable, and an abutment block is set on the turntable. This allows the abutment block to rotate around the axis of the turntable if it is squeezed during the bending process of the pipe fitting. This avoids the problem of the abutment block interfering with the bending of the pipe fitting due to being fixedly installed on the mounting plate. This increases the force on the turntable without interfering with the bending operation of the pipe fitting. Attached Figure Description

[0032] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0033] Figure 2 This is a front view of the present invention;

[0034] Figure 3 This is a top view of the present invention;

[0035] Figure 4 For the present invention Figure 3 Sectional view at point AA;

[0036] Figure 5 For the present invention Figure 4 Enlarged view of point B in the middle;

[0037] Figure 6 For the present invention Figure 4 Enlarged view of point C in the middle;

[0038] Figure 7 This is a three-dimensional schematic diagram of the turntable and mounting plate in this invention;

[0039] Figure 8 This is a three-dimensional schematic diagram of the rotating wheel in this invention.

[0040] In the diagram: 1. Rotary wheel; 2. Mounting plate; 3. Connecting shaft; 4. Slot; 5. Bolt hole; 6. Mounting hole; 7. Limiting groove; 8. Sliding groove; 9. Clamping block; 10. Insertion hole; 11. First spring; 12. Extrusion part; 13. Insert rod; 14. Conical part; 15. Limiting part; 16. Abutting block; 17. Arc-shaped part; 18. Rotating groove; 19. Turntable; 20. Snap ring; 21. Groove; 22. Support part; 23. Guide part; 24. Support platform; 25. Slide groove; 26. Slider; 27. Second spring; 28. Inclined ramp; 29. ​​Clamping groove; 30. Through groove; 31. Pull rod. Detailed Implementation

[0041] Please see Figures 1 to 8 This invention provides a pipe bending component for the production of stainless steel pipe fittings, the technical solution of which is as follows:

[0042] A pipe bending component for stainless steel pipe production includes a rotating wheel 1 and a mounting plate 2. A connecting shaft 3 is coaxially fixedly mounted on the bottom of the rotating wheel 1. A groove 4, adapted to the pipe fitting, is formed on the side wall of the rotating wheel 1. The mounting plate 2 has multiple bolt holes 5 for fixed connection with external equipment; these bolt holes 5 are countersunk bolt holes. A rotating groove 18 is formed on the mounting plate 2, and a turntable 19 is rotatably mounted inside the rotating groove 18. An annular retaining ring 20 is fixedly mounted inside the rotating groove 18. An annular groove 21 is formed on the side wall of the turntable 19, and the retaining ring 20 engages with the groove 21 to restrict the vertical movement of the turntable 19. A mounting hole 6 is coaxially provided on the turntable 19. The connecting shaft 3 from the rotating wheel 1 is coaxially inserted into the mounting hole 6 for positioning and installation. A limiting groove 7, which is annular and has a semi-circular cross-section, is formed inside the mounting hole 6.

[0043] refer to Figure 1 , Figure 4 and Figure 7 A contact block 16 is vertically fixed on the turntable 19. The contact block 16 has an arc-shaped portion 17, the circle of which coincides with the center of the turntable 1. The arc-shaped portion 17 is in contact with the outer wall of the turntable 1, and slides in contact with the outer wall of the turntable 1. A support portion 22 is provided on the side of the contact block 16 opposite to the arc-shaped portion 17. The support portion 22 is a right-angled triangle, with one right-angled side vertically fixed to the arc-shaped portion 17, and the other right-angled side parallel to and in sliding contact with the upper surface of the mounting plate 2.

[0044] refer to Figure 4 , Figure 6 and Figure 8A sliding groove 8 is provided on the connecting shaft 3. The sliding groove 8 is perpendicular to the axis of the connecting shaft 3. A locking block 9 is slidably installed inside the sliding groove 8. A semi-circular guide part 23 is provided at the end of the locking block 9 away from the axis of the connecting shaft 3. The locking block 9 matches the limiting groove 7. A pushing component is also provided inside the connecting shaft 3 for pushing the locking block 9 away from the axis of the connecting shaft 3 along the sliding groove 8.

[0045] Among them, reference Figure 1 , Figure 4 and Figure 6 The pushing assembly includes a vertically penetrating insertion hole 10 through the rotating wheel 1 and the connecting shaft 3. The insertion hole 10 is coaxially arranged with the connecting shaft 3. A sliding groove 8 communicates with the insertion hole 10, and a first spring 11 is provided inside the sliding groove 8. The first spring 11 is used to pull the locking block 9 towards the insertion hole 10, and the first spring 11 keeps the locking block 9 completely housed inside the sliding groove 8. An inclined pressing part 12 is provided at one end of the locking block 9 near the axis of the insertion hole 10, and the pressing part 12 extends into the insertion hole 10. The pushing assembly also includes a rod 13 for inserting into the insertion hole 10. A tapered part 14 is provided at the bottom of the rod 13, and a limiting part 15 is provided at the top of the rod 13 to prevent the rod 13 from fully extending into the insertion hole 10. The limiting part 15 is disc-shaped, and the side wall of the disc-shaped limiting part 15 abuts against the bottom of the clamping groove 29.

[0046] refer to Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 7 The abutment block 16 has a support platform 24, and a horizontal sliding groove 25 is provided on the abutment block 16. The sliding groove 25 is located on the upper side of the support platform. A slider 26 is slidably installed inside the sliding groove 25. A second spring 27 is provided inside the sliding groove 25. The second spring 27 is used to keep the slider 26 horizontally extending out of the sliding groove 25. An inclined ramp 28 is provided at the top of the slider 26. The bottom surface of the slider 26 extending out of the sliding groove 25 cooperates with the top surface of the support platform 24 to form a horizontal clamping groove 29. The clamping groove 29 is used to lock into the limiting part 15 to prevent the limiting part 15 from moving up and down. A through groove 30 is also provided at the top of the abutment block 16. The through groove 30 connects to the sliding groove 25. A pull rod 31 is provided at the top of the slider 26. The pull rod 31 passes through the through groove 30 and can slide along the through groove 30.

[0047] refer to Figures 1 to 8During use, the mounting plate 2 is first fixed in the designated position with bolts. Then, the connecting shaft 3 on the rotating wheel 1 is coaxially inserted into the mounting hole 6 until the bottom of the rotating wheel 1 abuts against the upper surface of the rotating plate 19. Next, the insertion rod 13 is inserted into the insertion hole 10 from above. During insertion, the tapered portion 14 at the bottom of the insertion rod 13 presses against the inclined pressing portion 12 on the locking block 9, causing the locking block 9 to move horizontally away from the insertion rod 13 and extend into the limiting groove 7. At this time, the first spring 11 is compressed. The locking block 9 extending into the limiting groove 7 restricts the up-and-down movement of the connecting shaft 3, thereby ensuring the stability of the rotating wheel 1 during the pipe bending operation. When the insertion rod 13 is inserted into the insertion hole 10, the bottom of the limiting part 15 on the insertion rod 13 will first contact the ramp 28 on the slider 26 as it passes the slider 26. As the insertion rod 13 continues to press down, the slider 26 is squeezed towards the inside of the groove 25 by the limiting part 15 under the guidance of the ramp 28, and the second spring 27 is compressed. When the limiting part 15 has completely passed the slider 26, the slider 26 returns to its original position under the elastic force of the second spring 27, and extends out of the groove 25 again, preventing the limiting part 15 from moving upward.

[0048] When bending the pipe fitting, the fitting with the corresponding shaft diameter is inserted into the slot 4 on the rotating wheel 1 to complete the positioning of the fitting. During bending, the abutment block 16 supports the side wall of the rotating wheel 1, increasing the strength of the rotating wheel 1 and the connecting shaft 3, and preventing the connecting shaft 3 and the rotating wheel 1 from being deformed and damaged by the force. When the fitting contacts the abutment block 16 due to the bending angle during the bending process, the fitting can push the abutment block 16 to rotate around the axis of the rotating wheel 1, and the abutment block 16 will not interfere with the bending path of the fitting. When the rotating wheel 1 needs to be replaced, simply pull the pull rod 31 to let the slider 26 retract into the sliding groove 25, and then pull the insertion rod 13 upward. When the bottom of the insertion rod 13 completely passes the top of the locking block 9, the locking block 9 resets under the elastic force of the first spring 11, the locking block 9 disengages from the limiting groove 7, and is completely retracted into the sliding groove 8. Then the rotating wheel 1 can be pulled upward along its axis to remove the rotating wheel 1. Then, insert the connecting shaft 3 on the rotating wheel 1 that needs to be installed into the mounting hole 6, and reinsert the plug rod 13 to complete the replacement.

[0049] The specific embodiment of the present invention has been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the embodiments described above. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and ideas of the present invention should still fall within the protection scope of the present invention.

Claims

1. A pipe bending component for the production of stainless steel pipe fittings, characterized in that, The device includes a rotating wheel and a mounting plate. A connecting shaft is coaxially fixedly mounted on the bottom of the rotating wheel. The side wall of the rotating wheel has a slot that matches the pipe fitting. The mounting plate has multiple bolt holes for fixed connection with external equipment. The mounting plate has mounting holes for inserting the connecting shaft. A limit groove is provided inside the mounting hole. The connecting shaft has a sliding groove that is perpendicular to the axis of the connecting shaft. A locking block is slidably mounted inside the sliding groove. The locking block matches the limit groove. The connecting shaft also has a pushing component inside for pushing the locking block away from the axis of the connecting shaft along the sliding groove. The pushing assembly includes a vertically penetrating insertion hole through the rotating wheel and the connecting shaft, the insertion hole and the connecting shaft being coaxially arranged, a sliding groove communicating with the insertion hole, and a first spring being provided inside the sliding groove; the first spring is used to pull the locking block towards the insertion hole, and the first spring keeps the locking block completely retracted inside the sliding groove; an inclined pressing part is provided at one end of the locking block near the axis of the insertion hole, and the pressing part extends into the insertion hole; the pushing assembly also includes a rod for inserting into the insertion hole, the bottom of the rod being provided with a tapered part, and the top of the rod being provided with a limiting part for preventing the rod from fully extending into the insertion hole; The mounting plate is provided with an abutment block, and the abutment block is provided with an arc-shaped part. The circle of the arc-shaped part coincides with the center of the wheel. The arc-shaped part fits against the outer wall of the wheel and slides in contact with the outer wall of the wheel. During bending, the abutment block supports the side wall of the rotating wheel, increasing the strength of the rotating wheel and connecting shaft, and preventing the connecting shaft and rotating wheel from being deformed and damaged by the force. When the pipe comes into contact with the abutment block due to the bending angle during the bending process, the pipe can push the abutment block to rotate around the axis of the rotating wheel, and the abutment block will not interfere with the bending path of the pipe. The abutment block has a support platform, and a horizontal sliding groove is formed on the abutment block. The sliding groove is located above the support platform, and a slider is slidably installed inside the sliding groove. A second spring is installed inside the sliding groove to keep the slider horizontally extending out of the sliding groove. The top of the slider has an inclined ramp. The bottom surface of the slider extending out of the sliding groove and the top surface of the support platform form a horizontal clamping groove. The clamping groove is used to engage with the limiting part to prevent the limiting part from moving up and down. The top of the abutment block also has a through groove that connects to the sliding groove. A pull rod is installed on the top of the slider. The pull rod passes through the through groove and can slide along the through groove. When the insert rod is inserted into the socket, the bottom of the limiting part on the insert rod will first contact the ramp on the slider when it passes the slider. As the insert rod is pressed down, the slider is squeezed into the groove by the limiting part under the guidance of the ramp. The second spring is compressed. When the limiting part has completely passed the slider, the slider is reset under the elastic force of the second spring and extends out of the groove again to prevent the limiting part from moving upward. The limiting part is disc-shaped, and the side wall of the disc-shaped limiting part abuts against the bottom of the clamping groove; The mounting plate has a rotating groove, inside which a turntable is rotatably mounted. An annular retaining ring is fixedly mounted inside the rotating groove. An annular groove is formed on the side wall of the turntable, and the retaining ring is inserted into the groove to restrict the up and down movement of the turntable. Mounting holes are formed on the turntable, and abutment blocks are vertically fixedly mounted on the turntable. A support part is provided on the side of the abutment block opposite to the arc-shaped part. The support part is a right-angled triangle. One right-angled side of the support part is vertically fixed to the arc-shaped part, and the other right-angled side of the support part is parallel to and in sliding contact with the upper surface of the mounting plate. The limiting groove is annular, and the cross-section of the limiting groove is semi-circular. A semi-circular guide is provided at the end of the block away from the axis of the connecting shaft.

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