Pipe bending machine demolding mechanism and pipe bending machine

Abstract

The invention discloses a pipe bending machine demolding mechanism which comprises a demolding hole formed in the groove wall of a wheel mold groove of a wheel mold and a demolding block movably arranged in the demolding hole. The forming binding face and the groove wall of the wheel mold groove can jointly form a continuous forming working wall face attached to the outer wall of a pipe, and the demolding block is in transmission connection with a demolding driving mechanism. The demolding driving mechanism can drive the demolding block to do ejection motion, so that the demolding block protrudes out of the groove wall of the wheel mold groove, a bent and formed pipe is ejected away from the groove wall of the wheel mold groove, and demolding of the pipe is achieved. The demolding driving mechanism can further drive the demolding block to do reset motion, so that the forming binding face and the groove wall of the wheel mold groove jointly form a continuous forming working wall face attached to the outer wall of the pipe. The invention further discloses the pipe bending machine with the pipe bending machine demolding mechanism. The pipe demolding device has the advantage of being capable of achieving quick demolding of pipes.

Description

Technical Field

[0001] This invention relates to the field of pipe bending equipment technology, specifically to a demolding mechanism for a pipe bending machine, and a pipe bending machine having the demolding mechanism. Background Technology

[0002] Pipe bending machines are commonly used pipe processing equipment, and their structure is as follows: Figure 1 As shown, it generally includes a mandrel feeding mechanism 300 for feeding the pipe, a pipe bending mechanism 400 for bending the straight pipe into shape, and a pipe pushing mechanism 500 for pushing the pipe forward during the bending process of the pipe bending mechanism 400.

[0003] The pipe bending mechanism 400 is the core component of the pipe bending machine. For example... Figure 1 , Figure 2 As shown, the pipe bending mechanism includes: a pipe bending spindle 15, which is rotatable around its own axis and mounted on the pipe bending machine frame, and is connected to a rotation drive mechanism that drives its rotation. A wheel mold 1 and a pipe bending arm 16 are mounted on the pipe bending spindle 15. A wheel mold groove 2 is formed along the circumferential direction on the outer peripheral wall of the wheel mold 1. The groove wall cross-section of the wheel mold groove 2 is arc-shaped and fits against the outer wall of the pipe 100. A wheel clamp 13 is fixedly mounted on the wheel mold 1 along the tangent direction of the wheel mold 1. A straight wheel clamp groove 14 is formed on the outer side wall of the wheel clamp 13. The wall cross section is arc-shaped and fits the outer wall of the pipe 100. The wheel clamp groove 14 is tangent to the wheel mold groove 2 and smoothly connected to form a continuous groove. A clamping mold corresponding to the wheel clamp is movably arranged on the pipe arm. A clamping mold groove corresponding to the wheel clamp groove is provided on the side wall of the clamping mold facing the wheel clamp. The groove wall cross section of the clamping mold groove is arc-shaped and fits the outer wall of the pipe. The clamping mold is connected to the clamping drive mechanism that drives it to approach or move away from the wheel clamp. When the clamping mold approaches the wheel mold and the wheel clamp on the wheel mold closes the mold, the wheel clamp groove and the clamping mold groove together form a mold cavity for accommodating and clamping the pipe.

[0004] During pipe bending operations, the pipe is first fed into the bending mechanism, with the section to be bent placed between the roller die and the clamping die, and the end of the section to be bent positioned between the clamping die and the roller clamp on the roller die. Then, the clamping drive mechanism moves the clamping die towards the roller clamp and closes the die, clamping the end of the pipe to be bent. Next, the drive mechanism rotates the main shaft in the forward direction, simultaneously rotating the roller die, roller clamp, bending arm, and clamping die together, thus bending the pipe along the roller die. After the pipe is bent, the main shaft stops rotating, and the clamping drive mechanism drives the clamping die away from the roller clamp to release the pipe. The operator then removes the bent pipe from the roller die groove. Finally, the drive mechanism rotates the main shaft in the reverse direction, resetting the roller die, bending arm, and clamping die to their original positions, preparing for the next pipe bending operation.

[0005] However, existing pipe bending mechanisms have the following shortcomings in practical applications: after bending, the pipe tends to tightly adhere to the die, making demolding difficult. This is especially true for large-diameter, thick-walled pipes with a diameter greater than 219mm and a wall thickness greater than 10mm, where the springback after bending is small, resulting in a tighter fit between the bent pipe and the die groove, making it virtually impossible for them to detach on their own. After each bending operation, operators must expend time and effort to forcibly remove the pipe from the die groove before extracting the finished product. This significantly increases labor intensity and severely impacts bending efficiency, making it difficult to meet the demands of continuous, efficient, and large-scale production. Summary of the Invention

[0006] The first objective of this invention is to provide a demolding mechanism for a pipe bending machine that enables rapid demolding of pipes.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a demolding mechanism for a pipe bending machine, comprising a demolding hole formed on the groove wall of the wheel mold and corresponding to the curved arc segment formed after the pipe is bent along the wheel mold, and a demolding module movably disposed in the demolding hole, wherein the demolding hole is located in the area corresponding to the curved arc segment formed after the pipe is bent along the wheel mold, the demolding module is provided with a forming and fitting surface, the forming and fitting surface being able to form a continuous forming working wall surface that fits against the outer wall of the pipe together with the groove wall of the wheel mold, and the demolding module being drivenly connected to a demolding drive mechanism; The demolding drive mechanism can drive the demolding module to make an ejection movement, so that the demolding module protrudes from the groove wall of the wheel mold, thereby pushing the bent tube away from the groove wall of the wheel mold and realizing the demolding of the tube; The demolding drive mechanism can also drive the demolding module to perform a reset movement, so that the molding and bonding surface and the groove wall of the wheel mold together form a continuous molding working wall surface that fits against the outer wall of the pipe.

[0008] Furthermore, in the aforementioned demolding mechanism of the pipe bending machine, the demolding hole is located at the groove wall of the wheel mold corresponding to the center position of the curved arc segment formed after the pipe is bent along the wheel mold.

[0009] Furthermore, in the aforementioned demolding mechanism of the pipe bending machine, a vertical hole communicating downward with the demolding hole is provided on the upper surface of the wheel mold; the demolding module consists of a connecting part for transmission connection with the demolding drive mechanism and a demolding shaft integrally extended downward from the bottom of the connecting part and inserted into the vertical hole. The demolding module is mounted on the wheel mold and can rotate relative to the wheel mold around the demolding shaft axis by inserting its demolding shaft downward into the vertical hole. A concave surface is provided on the outer peripheral wall of the demolding shaft at the position corresponding to the demolding hole. This concave surface constitutes a forming and fitting surface that can form a continuous forming working wall surface that fits against the outer wall of the pipe together with the groove wall of the wheel mold. The demolding drive mechanism can drive the demolding module to rotate through the connecting part so that the forming contact surface of the demolding shaft is misaligned with the demolding hole, so that the outer peripheral wall of the demolding shaft protrudes out of the groove wall of the wheel mold, thereby pushing the bent tube away from the groove wall of the wheel mold to achieve demolding of the tube. The demolding drive mechanism can also drive the demolding module to rotate in the opposite direction through the connecting part so that the molding contact surface of the demolding shaft re-forms a continuous molding working wall surface that is in contact with the outer wall of the tube, together with the groove wall of the wheel mold, thereby realizing the reset of the demolding module.

[0010] Furthermore, in the aforementioned demolding mechanism of the pipe bending machine, the demolding drive mechanism includes a mounting base and a demolding cylinder. The mounting base is fixed to the upper surface of the mold, the cylinder body of the demolding cylinder is hinged to the mounting base via a first vertical shaft, and the piston rod of the demolding cylinder is hinged to the connecting part of the demolding module via a second vertical shaft. When the piston rod of the demolding cylinder extends, it can drive the demolding module to rotate through the connecting part so that the forming contact surface of the demolding shaft is misaligned with the demolding hole, so that the outer peripheral wall of the demolding shaft protrudes out of the groove wall of the wheel mold, thereby pushing the bent tube away from the groove wall of the wheel mold to achieve demolding of the tube. When the piston rod of the demolding cylinder retracts, it can drive the demolding module to rotate in the opposite direction through the connecting part, so that the molding contact surface of the demolding shaft can re-form a continuous molding working wall that is in contact with the outer wall of the tube, thereby realizing the reset of the demolding module.

[0011] Furthermore, in the aforementioned demolding mechanism of the pipe bending machine, the hinged connection structure between the piston rod of the demolding cylinder and the demolding module connection part is as follows: the demolding module connection part has two upper and lower opposing ear plates extending outward integrally, and a shaft lug is fixed at the end of the piston rod of the demolding cylinder. The shaft lug extends between the two ear plates, and the second vertical shaft passes through both ear plates and the shaft lug simultaneously, so that the piston rod of the demolding cylinder can be hinged to the demolding module connection part through the second vertical shaft.

[0012] Furthermore, in the aforementioned demolding mechanism of the pipe bending machine, the mounting base is located on one side of the ear plate of the demolding module, and the position of the mounting base is set such that when the piston rod of the demolding cylinder retracts to drive the demolding module to rotate until the forming contact surface of the demolding shaft re-forms a continuous forming working wall surface that is in contact with the outer wall of the pipe together with the groove wall of the wheel mold, the ear plate of the demolding module just abuts against the mounting base so that the mounting base can position the reset position of the demolding module.

[0013] Furthermore, in the aforementioned demolding mechanism of the pipe bending machine, the demolding drive mechanism includes a demolding cylinder built into the demolding hole and arranged radially along the wheel mold. The cylinder body of the demolding cylinder is fixed to the wheel mold, and the piston rod of the demolding cylinder is fixed to the demolding module. The outer wall of the demolding module is provided with a concave surface, which constitutes a forming and fitting surface that can form a continuous forming working wall that fits against the outer wall of the pipe together with the groove wall of the wheel mold. When the piston rod of the demolding cylinder extends, it can drive the demolding module to move outward and protrude from the groove wall of the wheel mold, thereby pushing the bent tube away from the groove wall of the wheel mold to achieve demolding of the tube. When the piston rod of the demolding cylinder retracts, it drives the demolding module to move inward until the molding and bonding surface of the demolding module re-forms a continuous molding working wall that is in contact with the outer wall of the tube, thereby achieving the repositioning of the demolding module.

[0014] Furthermore, in the aforementioned demolding mechanism of the pipe bending machine, a positioning block is fixed inside the demolding hole to position the reset position of the demolding module.

[0015] The second objective of this invention is to provide a pipe bending machine that includes the above-mentioned demolding mechanism, which enables rapid demolding of large-diameter, thick-walled pipes, significantly reducing manual labor intensity and improving pipe bending processing efficiency.

[0016] To achieve the above objectives, the present invention adopts the following technical solution: a pipe bending machine, wherein a pipe bending demolding mechanism is provided on the roller mold of the pipe bending machine.

[0017] The beneficial effects of implementing the above technical solution are as follows: (1) By setting a movable demolding module on the groove wall of the wheel mold and using a demolding drive mechanism to drive the demolding module out, the demolding mechanism moves quickly and can quickly and automatically push the pipe tightly bound to the wheel mold after bending and forming away from the groove wall of the wheel mold, thus realizing the rapid demolding of the pipe. This fundamentally solves the problem that the pipe tightly bound to the wheel mold after bending and difficult to demold, thereby shortening the processing cycle of a single pipe, which is conducive to realizing the continuous operation of the pipe bending machine and greatly improving the production efficiency of pipe bending. It is especially suitable for demolding of large diameter thick-walled pipes with a diameter greater than 219mm and a wall thickness greater than 10mm. Moreover, the demolding process does not require manual prying, which greatly reduces the labor intensity of the operators.

[0018] (2) The demolding module has a molding and fitting surface that is compatible with the groove wall of the wheel mold. When resetting, it can form a continuous and smooth molding working wall with the groove of the wheel mold. It does not affect the support and molding accuracy of the pipe during the bending process, and the bending quality is stable and reliable.

[0019] (3) The demolding mechanism can be demolded by rotating the demolding module around the axis or by radially translating the demolding module. It is flexible and adaptable, and can be adapted to different specifications of pipe bending machines and wheel mold structures. It is highly versatile. The demolding module can be movably installed in the demolding hole of the wheel mold without occupying additional external space, making the overall structure more compact. Furthermore, the arrangement of the demolding mechanism does not affect the operation of the original mechanisms of the pipe bending machine, making it easy to upgrade and modify the existing pipe bending machine.

[0020] (4) By setting a positioning structure to precisely limit the reset position of the demolding module, the molding and bonding surface can be accurately aligned with the wheel mold groove after each reset of the demolding module, thereby ensuring the bending forming accuracy and the reliability of the demolding action.

[0021] (5) The mounting base serves as both a mounting base to support the demolding drive mechanism and a limit stop to precisely position the demolding module at its reset position. This integrated design simplifies the structure and helps reduce the cost of use for enterprises.

[0022] (6) The pipe bending machine with the demolding mechanism can realize the automated and rapid demolding of large-diameter thick-walled pipes, which can significantly reduce the intensity of manual labor and improve the efficiency of pipe bending. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the pipe bending machine described in the background section of this invention.

[0024] Figure 2 This is a schematic diagram of the wheel mold described in the background section of this invention.

[0025] Figure 3 This is a schematic diagram of the usage state of the demolding mechanism of the pipe bending machine described in Embodiment 1 of the present invention during the demolding and resetting process.

[0026] Figure 4 for Figure 3 Top view.

[0027] Figure 5 for Figure 3 A three-dimensional image.

[0028] Figure 6 This is a 3D view of the wheel model.

[0029] Figure 7 for Figure 5 The 3D image after removing the wheel model.

[0030] Figure 8 This is a schematic diagram of the usage state of the demolding mechanism of the pipe bending machine described in Embodiment 1 of the present invention when the demolding module is ejected to demold the bent pipe.

[0031] Figure 9 for Figure 8 The 3D image after removing the wheel model.

[0032] Figure 10 This is a schematic diagram of the demodule structure in Embodiment 1 of the present invention.

[0033] Figure 11 This is a perspective view of the module removal in Embodiment 1 of the present invention.

[0034] Figure 12 This is a schematic diagram of the demolding mechanism of the pipe bending machine described in Embodiment 2 of the present invention during the demolding and resetting process.

[0035] Figure 13 for Figure 12 The diagram shows a structural schematic of the AA cross section.

[0036] Figure 14 This is a schematic diagram of the demolding mechanism of the pipe bending machine described in Embodiment 2 of the present invention when the demolding module is ejected to demold the pipe.

[0037] Figure 15 This is a schematic diagram of the wheel mold in Embodiment 2 of the present invention.

[0038] Figure 16 This is a schematic diagram of the pipe bending machine with a demolding mechanism according to the present invention.

[0039] Figure 17 for Figure 16 An enlarged schematic diagram of part B shown in the figure. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Example 1

[0041] like Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 As shown, the demolding mechanism 200 of the pipe bending machine includes a demolding hole 3 opened on the groove wall of the groove 2 of the wheel mold 1 and corresponding to the bending arc segment formed after the pipe 100 is bent along the wheel mold 1, and a demolding module 4 movably disposed in the demolding hole 3. The demolding module 4 is provided with a forming and fitting surface 5. The forming and fitting surface 5 can form a continuous forming working wall surface that fits against the outer wall of the pipe 100 together with the groove wall 211 of the groove 2 of the wheel mold. The demolding module 4 is connected to the demolding drive mechanism. The demolding drive mechanism can drive the demolding module 4 to make an ejection movement, so that the demolding module 4 protrudes out of the groove wall 211 of the wheel mold groove 2, so as to push the bent tube 100 away from the groove wall 211 of the wheel mold groove 2 and realize the demolding of the tube 100. The demolding drive mechanism can also drive the demolding module 4 to perform a reset movement, so that the molding and bonding surface 5 and the groove wall 211 of the wheel mold groove 2 together form a continuous molding working wall surface that fits against the outer wall of the pipe 100.

[0042] In this embodiment, the demolding hole 3 is located at the groove wall 211 of the groove 2 of the wheel mold corresponding to the center position of the curved arc segment formed after the pipe 100 is bent and formed along the wheel mold 1. Since the center of the curved arc segment of the pipe is the part where the pipe bending deformation is the greatest and the mold is the tightest, the demolding module is pushed out from here, which can more effectively break the adhesion between the pipe and the wheel mold and achieve the most effective demolding.

[0043] In this embodiment, the demolding of the bent pipe is completed by rotating the demolding module. Specifically, a vertical hole 6 is provided on the upper surface of the wheel mold 1, which is connected to the demolding hole downward. The demolding module 4 consists of a connecting part 41 for transmission connection with the demolding drive mechanism and a demolding shaft 42 that extends downward from the bottom of the connecting part 41 and can be inserted into the vertical hole 6. The demolding module 4 is installed on the wheel mold 1 and can rotate relative to the wheel mold 1 around the axis of the demolding shaft 42 by inserting its demolding shaft 42 downward into the vertical hole 6. A concave surface is provided on the outer peripheral wall of the demolding shaft 42 at the position corresponding to the demolding hole 3. This concave surface constitutes a forming and fitting surface 5 that can form a continuous forming working wall surface that fits with the outer wall of the pipe 100 together with the groove wall 211 of the wheel mold groove 2. The demolding drive mechanism can drive the demolding module 4 to rotate through the connecting part 41 so that the forming contact surface 5 of the demolding shaft 42 is misaligned with the demolding hole 3, so that the outer peripheral wall of the demolding shaft 42 protrudes out of the groove wall 211 of the wheel mold groove 2, thereby pushing the bent tube 100 away from the groove wall 211 of the wheel mold groove 2 to achieve demolding of the tube 100. The demolding drive mechanism can also drive the demolding module 4 to rotate in the opposite direction through the connecting part 41 so that the molding contact surface 5 of the demolding shaft 42 and the groove wall 211 of the wheel mold groove 2 together form a continuous molding working wall surface that fits against the outer wall of the pipe 100, thereby realizing the reset of the demolding module 4.

[0044] In this embodiment, the demolding drive mechanism includes a mounting base 7 and a demolding cylinder 8. The mounting base 7 is fixed to the upper surface 101 of the wheel mold 1. The cylinder body 81 of the demolding cylinder 8 is hinged to the mounting base 7 via a first vertical shaft 9. The piston rod 82 of the demolding cylinder 8 is hinged to the connecting part 41 of the demolding module 4 via a second vertical shaft 10. In this embodiment, the hinged connection structure between the piston rod 82 of the demolding cylinder 8 and the connecting part 41 of the demolding module is as follows: the connecting part 41 of the demolding module 4 has two upper and lower opposing ear plates 43 extending outward integrally. A shaft lug 11 is fixed at the end of the piston rod 82 of the demolding cylinder 8. The shaft lug 11 extends between the two ear plates 43. The second vertical shaft 10 passes through both ear plates 43 and the shaft lug 11, so that the piston rod 82 of the demolding cylinder 8 can be hinged to the connecting part 41 of the demolding module 4 via the second vertical shaft 10.

[0045] When the piston rod 82 of the demolding cylinder extends, it can drive the demolding module 4 to rotate through the connecting part 41 so that the forming contact surface 5 of the demolding shaft 42 is misaligned with the demolding hole 3, so that the outer peripheral wall of the demolding shaft 42 protrudes out of the groove wall 211 of the wheel mold groove 2, thereby pushing the bent tube 100 away from the groove wall 211 of the wheel mold groove 2 to achieve demolding of the tube 100. When the piston rod 82 of the demolding cylinder 8 retracts, it can drive the demolding module 4 to rotate in the opposite direction through the connecting part 41 so that the molding contact surface 5 of the demolding shaft 42 and the groove wall 211 of the wheel mold groove 2 together form a continuous molding working wall that fits against the outer wall of the tube 100, so as to realize the reset of the demolding module 4.

[0046] In this embodiment, the mounting base 7 is located on one side of the ear plate 43 of the demolding module 4, and the position of the mounting base 7 is set such that when the piston rod 82 of the demolding cylinder 8 retracts to drive the demolding module 4 to rotate so that the forming contact surface 5 of the demolding shaft 42 re-forms a continuous forming working wall surface that is in contact with the outer wall of the tube 100 together with the groove wall 211 of the wheel mold groove 2, the ear plate 43 of the demolding module 4 is exactly against the mounting base 7, so that the mounting base 7 can position the reset position of the demolding module 4. By precisely limiting the reset position of the demolding module 4 through the mounting base 7, it is ensured that the forming contact surface 5 of the demolding module 4 can be accurately aligned with the groove wall 211 of the wheel mold groove 2 after each reset, thereby ensuring the bending forming accuracy and the reliability of the demolding action; and since the mounting base 7 in this embodiment serves as both a mounting base to support the demolding drive mechanism and a limiting block to precisely position the reset position of the demolding module 4, this integrated design simplifies the structure and helps to reduce the enterprise's usage cost. Example 2

[0047] The difference between this embodiment 2 and embodiment 1 is that embodiment 1 uses the method of driving the demolding module to rotate to complete the demolding of the bent pipe, while this embodiment 2 uses the method of driving the demolding module to translate to complete the demolding of the bent pipe.

[0048] like Figure 12 , Figure 13 , Figure 14 , Figure 15 As shown, the demolding mechanism 200 of the pipe bending machine includes a demolding hole 3 opened on the groove wall of the wheel mold 2 of the wheel mold 1, and a demolding module 4 movably disposed in the demolding hole 3. The demolding module 4 is a block-shaped structure that is slidably embedded in the demolding hole 3. A concave surface is provided on the outer side wall of the demolding module 4. The concave surface constitutes a forming and fitting surface 5 that can form a continuous forming working wall surface that fits against the outer wall of the pipe 100 together with the groove wall 211 of the wheel mold 2. The demolding module 4 is connected to the demolding drive mechanism. The demolding drive mechanism can drive the demolding module 4 to make an ejection movement, so that the demolding module 4 protrudes out of the groove wall 211 of the wheel mold groove 2, so as to push the bent tube 100 away from the groove wall 211 of the wheel mold groove 2 and realize the demolding of the tube 100. The demolding drive mechanism can also drive the demolding module 4 to perform a reset movement, so that the molding and bonding surface 5 and the groove wall 211 of the wheel mold groove 2 together form a continuous molding working wall surface that fits against the outer wall of the pipe 100.

[0049] In this embodiment, the demolding drive mechanism includes a demolding cylinder built into the demolding hole 3 and arranged radially along the wheel mold. The cylinder body 82 of the demolding cylinder is fixed to the wheel mold 1, and the piston rod 82 of the demolding cylinder is fixed to the demolding module 4. When the piston 82 of the demolding cylinder extends, it can drive the demolding module 4 to move outward along the demolding hole 3 and protrude outward from the groove wall 211 of the wheel mold groove 2, thereby pushing the bent tube 100 away from the groove wall 211 of the wheel mold groove 2 to achieve demolding of the tube 100. When the piston rod 82 of the demolding cylinder retracts, it can drive the demolding module 4 to move inward along the demolding hole 3 to the molding and bonding surface 5 of the demolding module 4, and together with the groove wall 211 of the wheel mold groove 2, form a continuous molding working wall surface that is in contact with the outer wall of the tube 100, so as to realize the reset of the demolding module 4.

[0050] In this embodiment, a positioning block 12 is fixed in the demolding hole 3 to position the reset position of the demolding module 4. The positioning block 12 precisely limits the reset position of the demolding module 4, ensuring that the forming and fitting surface 5 of the demolding module 4 can be accurately aligned with the groove wall 211 of the wheel mold groove 2 after each reset, thereby ensuring the bending forming accuracy and the reliability of the demolding action.

[0051] This invention also protects a pipe bending machine, such as Figure 16 , Figure 17As shown, it includes: a mandrel feeding mechanism 300 for feeding the pipe, a pipe bending mechanism 400 for bending the straight pipe into shape, and an auxiliary clamping and pushing mechanism 500 for pushing the pipe 100 forward during the bending process of the pipe bending mechanism 400. Since the mandrel feeding mechanism 300, the pipe bending mechanism 400 and the auxiliary clamping and pushing mechanism 500 are all existing structures, each structure will not be described in detail here. The pipe bending machine demolding mechanism 200 described in Embodiment 1 or Embodiment 2 is provided on the roller mold 1 of the pipe bending machine. After the pipe bending mechanism 400 bends the pipe into shape and the clamping mold in the pipe bending mechanism 400 is unclamped, the pipe bending machine demolding mechanism 200 can quickly and automatically push the pipe that is tightly wrapped on the roller mold after bending into shape away from the groove wall of the roller mold, so as to realize the rapid demolding of the pipe.

[0052] The advantages of this invention are: (1) By setting a movable demolding module on the groove wall of the wheel mold and using a demolding drive mechanism to drive the demolding module out, the demolding mechanism moves quickly and can quickly and automatically push the pipe tightly bound to the wheel mold after bending and forming away from the groove wall of the wheel mold, thus realizing the rapid demolding of the pipe. This fundamentally solves the problem that the pipe tightly bound to the wheel mold after bending and difficult to demold, thereby shortening the processing cycle of a single pipe, which is conducive to realizing the continuous operation of the pipe bending machine and greatly improving the production efficiency of pipe bending. It is especially suitable for demolding of large diameter thick-walled pipes with a diameter greater than 219mm and a wall thickness greater than 10mm. Moreover, the demolding process does not require manual prying, which greatly reduces the labor intensity of the operators.

[0053] (2) The demolding module has a molding and fitting surface that is compatible with the groove wall of the wheel mold. When resetting, it can form a continuous and smooth molding working wall with the groove of the wheel mold. It does not affect the support and molding accuracy of the pipe during the bending process, and the bending quality is stable and reliable.

[0054] (3) The demolding mechanism can be demolded by rotating the demolding module around the axis or by radially translating the demolding module. It is flexible and adaptable, and can be adapted to different specifications of pipe bending machines and wheel mold structures. It is highly versatile. The demolding module can be movably installed in the demolding hole of the wheel mold without occupying additional external space, making the overall structure more compact. Furthermore, the arrangement of the demolding mechanism does not affect the operation of the original mechanisms of the pipe bending machine, making it easy to upgrade and modify the existing pipe bending machine.

[0055] (4) By setting a positioning structure to precisely limit the reset position of the demolding module, the molding and bonding surface can be accurately aligned with the wheel mold groove after each reset of the demolding module, thereby ensuring the bending forming accuracy and the reliability of the demolding action.

[0056] (5) The mounting base serves as both a mounting base to support the demolding drive mechanism and a limit stop to precisely position the demolding module at its reset position. This integrated design simplifies the structure and helps reduce the cost of use for enterprises.

[0057] (6) The pipe bending machine with the demolding mechanism can realize the automated and rapid demolding of large-diameter thick-walled pipes, which can significantly reduce the intensity of manual labor and improve the efficiency of pipe bending.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any modifications or equivalent changes made based on the technical essence of the present invention shall still fall within the scope of protection claimed by the present invention.

Claims

1. A demolding mechanism for a pipe bending machine, characterized in that: The device includes a demolding hole formed on the groove wall of the wheel mold and corresponding to the curved arc segment formed after the tube is bent along the wheel mold, and a demolding module movably disposed in the demolding hole. The demolding module is provided with a molding and fitting surface, which can form a continuous molding working wall that fits against the outer wall of the tube together with the groove wall of the wheel mold. The demolding module is connected to the demolding drive mechanism. The demolding drive mechanism can drive the demolding module to make an ejection movement, so that the demolding module protrudes from the groove wall of the wheel mold, thereby pushing the bent tube away from the groove wall of the wheel mold and realizing the demolding of the tube; The demolding drive mechanism can also drive the demolding module to perform a reset movement, so that the molding and bonding surface and the groove wall of the wheel mold together form a continuous molding working wall surface that fits against the outer wall of the pipe.

2. The demolding mechanism for a pipe bending machine according to claim 1, characterized in that: The demolding hole is located on the groove wall of the wheel mold corresponding to the center of the curved arc segment formed after the tube is bent and formed by the wheel mold.

3. The demolding mechanism for a pipe bending machine according to claim 1, characterized in that: A vertical hole is provided on the upper surface of the wheel mold, which is connected to the demolding hole downwards; the demolding module consists of a connecting part for transmission connection with the demolding drive mechanism, and a demolding shaft that extends integrally downwards from the bottom of the connecting part and can be inserted into the vertical hole. The demolding module is installed on the wheel mold and can rotate relative to the wheel mold around the demolding shaft axis by inserting its demolding shaft downwards into the vertical hole. A concave surface is provided on the outer peripheral wall of the demolding shaft at the position corresponding to the demolding hole. This concave surface constitutes a forming and fitting surface that can form a continuous forming working wall surface that fits against the outer wall of the tube together with the groove wall of the wheel mold. The demolding drive mechanism can drive the demolding module to rotate through the connecting part so that the forming contact surface of the demolding shaft is misaligned with the demolding hole, so that the outer peripheral wall of the demolding shaft protrudes out of the groove wall of the wheel mold, thereby pushing the bent tube away from the groove wall of the wheel mold to achieve demolding of the tube. The demolding drive mechanism can also drive the demolding module to rotate in the opposite direction through the connecting part so that the molding contact surface of the demolding shaft re-forms a continuous molding working wall surface that is in contact with the outer wall of the tube, together with the groove wall of the wheel mold, thereby realizing the reset of the demolding module.

4. The demolding mechanism for a pipe bending machine according to claim 3, characterized in that: The demolding drive mechanism includes a mounting base and a demolding cylinder. The mounting base is fixed to the upper surface of the wheel mold. The cylinder body of the demolding cylinder is hinged to the mounting base via a first vertical shaft. The piston rod of the demolding cylinder is hinged to the connecting part of the demolding module via a second vertical shaft. When the piston rod of the demolding cylinder extends, it can drive the demolding module to rotate through the connecting part so that the forming contact surface of the demolding shaft is misaligned with the demolding hole, so that the outer peripheral wall of the demolding shaft protrudes out of the groove wall of the wheel mold, thereby pushing the bent tube away from the groove wall of the wheel mold to achieve demolding of the tube. When the piston rod of the demolding cylinder retracts, it can drive the demolding module to rotate in the opposite direction through the connecting part, so that the molding contact surface of the demolding shaft can re-form a continuous molding working wall that is in contact with the outer wall of the tube, thereby realizing the reset of the demolding module.

5. The demolding mechanism for a pipe bending machine according to claim 4, characterized in that: The hinged connection structure between the piston rod of the demolding cylinder and the demolding module connection part is as follows: the demolding module connection part has two upper and lower opposing ear plates extending outward integrally, and a shaft lug is fixed at the end of the piston rod of the demolding cylinder. The shaft lug extends between the two ear plates, and the second vertical shaft passes through both ear plates and the shaft lug at the same time, so that the piston rod of the demolding cylinder can be hinged to the demolding module connection part through the second vertical shaft.

6. The demolding mechanism for a pipe bending machine according to claim 5, characterized in that: The mounting base is located on one side of the ear plate of the demolding module, and the position of the mounting base is set such that when the piston rod of the demolding cylinder retracts to drive the demolding module to rotate so that the molding contact surface of the demolding shaft re-forms a continuous molding working wall surface that is in contact with the outer wall of the tube, the ear plate of the demolding module is exactly against the mounting base so that the mounting base can position the reset position of the demolding module.

7. The demolding mechanism for a pipe bending machine according to claim 1, characterized in that: The demolding drive mechanism includes a demolding cylinder built into the demolding hole and arranged radially along the wheel mold. The cylinder body of the demolding cylinder is fixed to the wheel mold, and the piston rod of the demolding cylinder is fixed to the demolding module. The outer side wall of the demolding module is provided with a concave surface, which constitutes a forming and fitting surface that can form a continuous forming working wall that fits against the outer wall of the tube together with the groove wall of the wheel mold. When the piston rod of the demolding cylinder extends, it can drive the demolding module to move outward and protrude from the groove wall of the wheel mold, thereby pushing the bent tube away from the groove wall of the wheel mold to achieve demolding of the tube. When the piston rod of the demolding cylinder retracts, it drives the demolding module to move inward until the molding and bonding surface of the demolding module re-forms a continuous molding working wall that is in contact with the outer wall of the tube, thereby achieving the repositioning of the demolding module.

8. The demolding mechanism for a pipe bending machine according to claim 7, characterized in that: A positioning block is fixed inside the demolding hole to position the demolding module at its reset position.

9. A pipe bending machine, characterized in that: The tube bending machine has a tube bending machine demolding mechanism as described in any one of claims 1 to 8 on the tube bending machine mold.

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