A pipe bender

Abstract

This utility model relates to the technical field of pipe bending machines, and more particularly to a pipe bending machine, including a pipe bending frame, a top wheel that can extend and retract within the pipe bending frame, force-receiving wheels and fixing components spaced apart on both sides of the pipe bending frame. The pipe bending frame has a cavity communicating with the outside, and the force-receiving wheels are rotatably disposed within the cavity. The fixing components and force-receiving wheels are correspondingly arranged along the extension direction of the top wheel, and there is a pipe fitting fixing position communicating with the cavity between the fixing components and the force-receiving wheels. The fixing components and force-receiving wheels can be assembled into the pipe bending frame according to a preset position to form a pipe fitting fixing position in the cavity that matches the pipe fitting. The operator can directly insert the pipe fitting into the pipe fitting fixing position, and the pipe fitting can be clamped by the fixing components and force-receiving wheels. There is no need to manually fix the pipe fitting at the top wheel, which greatly reduces the manual operation steps and labor intensity. A single person can complete the loading and fixing, making the operation more convenient and improving the pipe bending efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of pipe bending machines, and more particularly to a pipe bending machine. Background Technology

[0002] In many fields such as machinery manufacturing, pipeline engineering, automotive parts processing, and furniture production, pipe bending machines are often used to process straight pipes into bent pipes with specific bending angles and curvatures to meet the needs of different equipment structures and installation spaces. Some existing manual pipe bending machines require manual external force to first fit the straight pipe into the groove of the top roller, and then manually install the corresponding force-bearing roller. The straight pipe is then clamped by the top roller and the force-bearing roller, which is a very cumbersome operation and affects the bending efficiency.

[0003] This utility model was proposed in response to the shortcomings of the existing technology. Utility Model Content

[0004] This utility model addresses the problem that some existing manual pipe bending machines require manual external force to first fit the straight pipe fitting into the groove of the top wheel, and then manually install the corresponding force-bearing wheel. The straight pipe fitting is clamped by the top wheel and the force-bearing wheel, which is very troublesome and affects the bending efficiency. This utility model proposes a pipe bending machine.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A pipe bending machine includes a pipe bending frame, a top wheel extendable within the pipe bending frame, force-receiving wheels spaced apart on both sides of the pipe bending frame, and a fixing member. The pipe bending frame has a cavity communicating with the outside. The force-receiving wheels are rotatably disposed within the cavity. The fixing member and the force-receiving wheels are correspondingly arranged along the extension direction of the top wheel, and there is a pipe fixing position communicating with the cavity between the fixing member and the force-receiving wheels.

[0006] In the pipe bending machine described above, the force-bearing wheel is installed obliquely to the outside of the fixing member along the extension and retraction direction of the top wheel.

[0007] As described above, a pipe bending machine frame includes a top plate and a bottom plate located below the top plate. The top plate and the bottom plate are spaced apart vertically to form the cavity. The top wheel moves telescopically within the cavity relative to the fixed position of the pipe fitting.

[0008] As described above, a pipe bending machine has a first mounting structure and a second mounting structure symmetrically distributed on both sides of the pipe bending machine frame. The first mounting structure and the second mounting structure are respectively located on both sides of the pipe fixing position. The first mounting structure is used to install the force-bearing wheel, and the second mounting structure is used to install the fixing member. The first mounting structure includes a first mounting hole extending longitudinally through the top plate and the bottom plate, and the second mounting structure includes a second mounting hole extending longitudinally through the top plate and the bottom plate. The force-bearing wheel is rotatably connected between two corresponding first mounting holes, and the fixing member passes through the two corresponding second mounting holes along the pipe bending machine frame.

[0009] As described above, a pipe bending machine has a plurality of first mounting holes, each of which is equally spaced along a first distribution path, and the first distribution path has a first preset angle with the central axis of the pipe bending machine frame. The second mounting hole is provided in a plurality of them, and each second mounting hole is equally spaced along the second distribution path. The second distribution path has a second preset angle with the central axis of the pipe bending machine frame, and the second preset angle is equal to the first preset angle.

[0010] As described above, in a pipe bending machine, the outer wall of the force-bearing wheel is provided with a plurality of force-bearing pipe grooves distributed circumferentially, and each of the force-bearing pipe grooves is higher than the base plate.

[0011] As described above, in a pipe bending machine, the top wheel is provided with a top wheel groove facing the fixed position of the pipe fitting.

[0012] The pipe bending machine described above further includes a body assembly connected to the pipe bending machine frame. The body assembly includes a drive device connected to the top wheel, the drive device being used to drive the top wheel to move telescopically. The drive device includes a driver and a transmission rod disposed between the driver and the top wheel.

[0013] The pipe bending machine described above further includes a limiting device disposed on the upper part of the drive device. The limiting device is used to limit the extension distance of the top wheel, and the pipe bending machine is equipped with a positioning block opposite to the limiting device.

[0014] As described above, in a pipe bending machine, the limiting device includes a connecting bracket disposed on the upper part of the top wheel and a limiting member connected to the connecting bracket. The top of the pipe bending machine frame is provided with a sliding hole, and the positioning block is disposed on the upper part of the pipe bending machine frame. The connecting bracket extends at least partially through the sliding hole to the top of the pipe bending machine frame, so that the limiting member is installed above the pipe bending machine frame and is opposite to the positioning block.

[0015] Compared with the prior art, the beneficial effects of this utility model are: This utility model provides a pipe bending machine, which includes a pipe bending frame, a top wheel retractable within the pipe bending frame, force-receiving wheels spaced apart on both sides of the pipe bending frame, and a fixing component. The pipe bending frame has a cavity communicating with the outside. The force-receiving wheels are rotatably disposed within the cavity. The fixing component and the force-receiving wheels are correspondingly arranged along the extension direction of the top wheel, and a pipe fitting fixing position communicating with the cavity is provided between the fixing component and the force-receiving wheels. The fixing component and the force-receiving wheels can be pre-assembled into the pipe bending frame according to a preset position to form a pipe fitting fixing position within the cavity that matches the pipe fitting. The operator can directly insert the pipe fitting into the pipe fitting fixing position, and the fixing component and the force-receiving wheels will then be used to fix the pipe fitting. The clamping mechanism eliminates the need for manual fixing of pipe fittings to the top roller, significantly reducing manual operation steps and labor intensity. A single person can complete the loading and fixing process, making operation more convenient and improving pipe bending efficiency. Furthermore, by clamping the pipe fittings from both sides along the extension direction of the top roller using the fixing components and the force-bearing roller, sagging, swaying, and offset phenomena can be avoided, which helps improve the accuracy of pipe bending. In addition, the pre-positioned assembly of the fixing components and the force-bearing roller ensures the corresponding accuracy of the fixing components and the force-bearing roller along the extension direction of the top roller, avoiding positional deviations caused by temporary manual installation, and ensuring that the spatial dimensions of the pipe fitting fixing position are precisely matched with the pipe fitting specifications.

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1 This is a perspective view of the pipe bending machine of this utility model; Figure 2 This is a side view of the pipe bending machine of this utility model (with the driver hidden). Figure 3 for Figure 1 Sectional view A-A in the middle; Figure 4 This is a top view of the top plate of the pipe bending machine frame of this utility model. Detailed Implementation

[0018] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings. The described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0019] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0020] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0021] This utility model provides a pipe bending machine, which can be used to process large U-bend pipe fittings. Traditional large U-bend pipe bending machines require manual fixing of the straight pipe fitting at the top wheel 4, and then manual installation of the force-bearing wheel 5 to fix the straight pipe fitting between the top wheel 4 and the force-bearing wheel 5. Then, the top wheel 4 is driven to push out to process the straight pipe fitting into a bent pipe fitting. In actual operation, it relies on manual fixing of the straight pipe fitting, which is cumbersome and has low bending efficiency.

[0022] To solve the above problems, this utility model improves the pipe bending machine, such as... Figures 1 to 4 As shown, where Figure 3The dotted lines represent straight pipe fittings to be bent. The pipe bending machine includes a bending frame 1, a top wheel 4 extendable within the bending frame 1, force-receiving wheels 5 spaced apart on both sides of the bending frame 1, and a fixing member 6. The bending frame 1 has a cavity 13 communicating with the outside. The force-receiving wheels 5 are rotatably disposed within the cavity 13. The fixing member 6 and the force-receiving wheels 5 are correspondingly arranged along the extension direction of the top wheel 4, and a pipe fitting fixing position 131 communicating with the cavity 13 is formed between the fixing member 6 and the force-receiving wheels 5. In practical applications, the fixing member 6 and the force-receiving wheels 5 can be assembled into the bending frame 1 according to a preset position to form a pipe fitting fixing position 131 adapted to the pipe fitting within the cavity 13. The cavity 13 communicates with the outside, and the operator can directly insert the straight pipe fitting from the side of the cavity 13. In the pipe fitting fixing position 131, the pipe fitting is clamped by the fixing member 6 and the force-bearing wheel 5, eliminating the need for manual fixing of the pipe fitting to the top wheel 4. This significantly reduces manual operation steps and labor intensity, allowing a single person to complete the loading and fixing, making operation more convenient and improving pipe bending efficiency. Furthermore, the fixing member 6 and the force-bearing wheel 5 are arranged sequentially at intervals along the extension direction of the top wheel 4. By clamping the pipe fitting from both sides along the extension direction of the top wheel 4, the pipe fitting can be prevented from sagging, shaking, and shifting, which helps to improve the accuracy of pipe bending. In addition, the pre-positioned assembly of the fixing member 6 and the force-bearing wheel 5 ensures the corresponding accuracy of the fixing member 6 and the force-bearing wheel 5 along the extension direction of the top wheel 4, avoiding positional deviations caused by temporary manual installation, and ensuring that the spatial dimensions of the pipe fitting fixing position 131 are precisely matched with the pipe fitting specifications.

[0023] Optionally, the left-side fixing member 6 and the force-bearing wheel 5 are symmetrically arranged along the central axis S of the bending frame 1 with the right-side fixing member 6 and the force-bearing wheel 5. The central axis S of the bending frame 1 is parallel to the extension path of the top wheel 4. The axial direction of the pipe fitting fixing position 131 is approximately perpendicular to the extension direction of the top wheel 4 to ensure that the straight pipe fitting can be smoothly inserted into the pipe fitting fixing position 131 and extended by the top wheel 4 to drive part of the pipe fitting to deform in the extension direction of the top wheel 4, so that the straight pipe fitting is processed into a bent pipe fitting with a preset angle. The top wheel 4 is provided with a top wheel groove 41 facing the pipe fitting fixing position 131. The top wheel groove 41 is at least partially adapted to the outer contour of the pipe fitting, and the two sides of the top wheel groove 41 extend along the contour of the inner bend of the bent pipe fitting. The top wheel groove 41 partially wraps around the outside of the pipe fitting to protect the outer surface of the pipe fitting, prevent the pipe fitting from deforming, and thus improve the bending quality.

[0024] In some alternative embodiments, such as Figure 3 and Figure 4As shown, along the extension and retraction direction of the top wheel 4, the force-bearing wheel 5 is installed obliquely to the outside of the fixing member 6. In practical applications, the fixing member 6 achieves stable clamping at the position of the pipe close to the inner side of the pipe bending frame 1, while the force-bearing wheel 5 provides precise trajectory guidance for the bending of the pipe on the outside. When the top wheel 4 extends and applies a pushing force to the pipe, the pipe will bend smoothly with the force-bearing wheel 5 as the fulcrum. At the same time, by setting the fixing member 6 obliquely to the inside of the force-bearing wheel 5, sufficient bending space is reserved for the pipe. When the pipe is bent and deformed, the fixing member 6 can be prevented from blocking the bending and causing the bending trajectory to shrink or jam, thus ensuring the normal bending of the pipe.

[0025] Furthermore, such as Figure 2 As shown, along the insertion direction of the straight pipe fitting relative to the pipe fitting fixing position 131, the projected width of the pipe fitting fixing position 131 is equal to the outer diameter of the straight pipe fitting, that is, the projected distance between the fixing member 6 and the force-receiving wheel 5 is equal to the outer diameter of the straight pipe fitting, so as to facilitate the insertion and fixing of the straight pipe fitting in the pipe fitting fixing position 131. At the same time, when the pipe fitting is inserted into the pipe fitting fixing position 131, the force-receiving wheel 5 can generate axial rotation under external force, which can further improve the smoothness of the straight pipe fitting insertion and movement.

[0026] In some alternative embodiments, such as Figure 1 As shown, the pipe bending frame 1 includes a top plate 11 and a bottom plate 12 located below the top plate 11. The top plate 11 and the bottom plate 12 are spaced vertically to form the cavity 13. The pipe fitting fixing position 131 communicates with the cavity 13. The top wheel 4 moves telescopically within the cavity 13 relative to the pipe fitting fixing position 131. By spaced vertically between the top plate 11 and the bottom plate 12, the cavity 13, which communicates directly with the outside, can be formed, which is beneficial for the placement and removal of pipe fittings. The pipe bending frame 1 has a simple structure and low production cost. In practical applications, the top wheel 4 can extend into the cavity 13 toward the pipe fitting fixing position 131 to achieve pipe bending. After bending is completed, the top wheel 4 retracts away from the pipe fitting fixing position 131 within the cavity 13 to release the pipe fitting. The operator can then remove the bent pipe fitting from the side of the cavity 13.

[0027] Optionally, at least one set of connecting columns is provided on both the left and right sides of the cavity 13. The two connecting columns are fixedly connected to the top plate 11 and the bottom plate 12, which helps to improve the structural stability of the pipe bending machine frame 1 and allows the cavity 13 between the top plate 11 and the bottom plate 12 to be large enough to accommodate the fixing member 6, the force-bearing wheel 5 and the top wheel 4, while ensuring the placement and removal of the pipe fitting. The two connecting columns can be fixedly connected between the top plate 11 and the bottom plate 12 by welding or other means, which is not specifically limited in this utility model. The two connecting columns are located outside the pipe fitting fixing position 131 to avoid obstructing the pipe fitting, and the two connecting columns are located outside the extension and retraction path of the top wheel 4 to avoid obstructing the smooth progress of the pipe bending process.

[0028] In some alternative embodiments, such as Figure 1 and Figure 3 As shown, the pipe bending frame 1 has a first mounting structure 2 and a second mounting structure 3 symmetrically distributed on both sides. The first mounting structure 2 and the second mounting structure 3 are respectively located on both sides of the pipe fitting fixing position 131. The first mounting structure 2 is used to install the force-bearing wheel 5, and the second mounting structure 3 is used to install the fixing member 6. The first mounting structure 2 includes a first mounting hole 21 extending longitudinally through the top plate 11 and the bottom plate 12. The second mounting structure 3 includes a second mounting hole 31 extending longitudinally through the top plate 11 and the bottom plate 12. The force-bearing wheel 5 is rotatably connected between the two corresponding first mounting holes 21. The fixing member 6 passes through the two corresponding second mounting holes 31 along the pipe bending frame 1. Along the central axis S of the pipe bending frame 1, there are two sets of first mounting structures 2 and two sets of second mounting structures 3 symmetrically distributed, which helps to ensure that the left and right sides of the pipe fitting are evenly stressed and reduces the situation of local deformation of the pipe wall or bending jamming.

[0029] Furthermore, such as Figure 2As shown, the fixing member 6 can be configured as a T-shaped insert or similar structure. The fixing member 6 includes a connected rod head and rod body. The rod head abuts against the upper part of the top plate 11, and the rod body passes longitudinally through the corresponding upper and lower second mounting holes 31. The bottom of the rod body extends to the lower part of the bottom plate 12. The extended portion of the rod body relative to the bottom plate 12 can be provided with a threaded outer wall and is connected to the rod body and fixed against the bottom of the bottom plate 12 by a suitable nut. This allows the fixing member 6 to be detachably fixed in the pipe bending machine frame 1. The structure is simple and easy to implement, which helps to reduce the production and maintenance costs of the pipe bending machine. In practical applications, the fixing member 6 is detachably connected to the pipe bending machine frame 1. After the pipe bending is completed, the top wheel 4 retracts to release the pipe. At this time, the operator can remove the fixing member 6 to facilitate the smooth removal of the pipe and avoid secondary compression of the pipe with the fixing member 6 or the force wheel 5, which could lead to deformation. On the other hand, the force-bearing wheel 5 has a through hole along its longitudinal direction, which is aligned with the first mounting hole 21 above and below. It is connected to the top plate 11, the force-bearing wheel 5, and the bottom plate 12 through a connecting shaft 9, thereby realizing the rotational connection of the force-bearing wheel 5. The structure of the connecting shaft 9 can be similar to that of the fixing member 6 to reduce the manufacturing cost of the pipe bending machine. During the pipe bending process, the pipe is bent and deformed along the extension direction of the top wheel 4 and applies an external force to the force-bearing wheel 5, causing the force-bearing wheel 5 to rotate axially around the connecting shaft 9. This can avoid the rigid compression of the pipe by the force-bearing wheel 5, which would cause the pipe to deform. This greatly reduces the surface damage of the pipe and protects the appearance and structural integrity of the pipe. At the same time, it ensures the stability of the bending trajectory of the pipe and improves the bending accuracy. In addition, the axial rotation of the force-bearing wheel 5 can also reduce the driving resistance of the top wheel 4, reduce the equipment energy consumption of the pipe bending machine, and reduce the wear and tear of the top wheel 4, the pipe, the force-bearing wheel 5, and other components.

[0030] like Figures 1 to 4As shown, the outer wall of the force-bearing wheel 5 is provided with several circumferentially distributed force-bearing grooves 51. Each force-bearing groove 51 is adapted to the outer contour of the pipe fitting. Each force-bearing groove 51 is higher than the bottom plate 12, so that the top wheel 4 can extend into the space between the pipe fitting and the bottom plate 12. This ensures that the pipe fitting fits in the groove 41 of the top wheel, improves the processing quality of the outer surface of the pipe fitting, and avoids wrinkles and scratches on the pipe fitting. At the same time, a certain gap can be formed between the top wheel 4 and the bottom plate 12 to ensure the normal extension and retraction of the top wheel 4, reduce the moving friction of the top wheel 4, improve the bending efficiency, and reduce the wear of the top wheel 4. In practical applications, since each of the force-bearing grooves 51 is higher than the base plate 12, before bending begins, the straight pipe is clamped by the fixing member 6 and the force-bearing wheel 5, while the straight pipe fits into one of the force-bearing grooves 51. The groove wall of the force-bearing groove 51 extends at least partially to the lower part of the straight pipe to support it and prevent it from sagging. At the same time, the fixing member 6 fixes the straight pipe in the force-bearing groove 51 to prevent it from detaching from the groove under gravity. During the bending process, the axial rotation of the force-bearing wheel 5 drives each of the force-bearing grooves 51 to rotate relative to the pipe, ensuring that the pipe is always within the corresponding force-bearing groove 51, further protecting the pipe and ensuring the quality of the bending process.

[0031] In some alternative embodiments, such as Figure 1 and Figure 4 As shown, a plurality of first mounting holes 21 are provided, each first mounting hole 21 being equally spaced along a first distribution path 211, and the first distribution path 211 having a first preset angle 212 between it and the central axis S of the pipe bending machine frame 1; a plurality of second mounting holes 31 are provided, each second mounting hole 31 being equally spaced along a second distribution path 311, and the second distribution path 311 having a second preset angle 312 between it and the central axis S of the pipe bending machine frame 1, the second preset angle 312 being equal to the first preset angle 212; by providing a plurality of first mounting holes 21 and second mounting holes 31, actual production The installation positions of the force-bearing wheel 5 and the fixing component 6 can be adjusted according to the processing requirements of different pipe diameters and bending radii of the pipe bends. There is no need to replace the entire pipe bending machine frame 1 or the mold. The force-bearing wheel 5 and the fixing component 6 can be adapted by selecting the corresponding mounting holes. For example, when processing pipes with small bending radii, the mounting hole close to the central axis S of the pipe bending machine frame 1 can be selected, and when processing pipes with large bending radii, the mounting hole far away from the central axis S of the pipe bending machine frame 1 can be selected. The adjustment process is precise and has a standard spacing reference, avoiding errors caused by manual adjustment based on experience. This can improve the applicability of the pipe bending machine and reduce the adjustment time of the pipe bending machine frame 1, which is conducive to improving the pipe bending efficiency.

[0032] Furthermore, such as Figure 4As shown, the first distribution path 211 and the second distribution path 311 are arranged in parallel and corresponding manner, which helps to maintain the consistency of the positioning of the pipe bending process of the fixing member 6 and the force-bearing wheel 5, and further ensures the stability of the spatial dimensions of the pipe fixing position 131, so that the pipe can be evenly clamped after being placed in, reducing the bending angle deviation caused by the fixing offset.

[0033] On the other hand, such as Figure 1 As shown, the pipe bending machine also includes a body assembly 7 connected to the pipe bending machine frame 1. The body assembly 7 includes a drive device 71 connected to the top wheel 4. The drive device 71 is used to drive the top wheel 4 to extend and retract. The drive device 71 includes a driver 711 and a transmission rod 712 disposed between the driver 711 and the top wheel 4. The transmission rod 712 is connected to the output end of the driver 711, and the top wheel 4 is connected to the end of the transmission rod 712 away from the driver 711. In this embodiment, the driver 711 can be configured as a pneumatic, hydraulic, or electric driver, etc., and this utility model does not make a specific limitation. The transmission rod 712 can be configured as a piston-type telescopic rod, an electric telescopic rod, a screw-nut type telescopic rod, etc. The driver 711 drives the transmission rod 712 to extend and retract, and the transmission rod 712 drives the top wheel 4 to extend and retract. The top wheel 4 moves telescopically within the cavity 13 relative to the fixed position 131 of the pipe fitting. An electric telescopic drive device 71 outputs stable power, which, in conjunction with a telescopic transmission rod 712, precisely transmits the driving force. This allows for uniform and controllable telescopic movement of the top wheel 4 within the cavity 13 relative to the fixed position 131 of the pipe fitting. This avoids fluctuations in the telescopic speed of the top wheel 4 caused by uneven manual driving force, ensuring stable force distribution during pipe bending and reducing local deformation or cracking of the pipe wall caused by sudden changes in external force. This is particularly suitable for processing thick-walled pipe fittings requiring continuous and stable thrust. Simultaneously, the telescopic transmission rod 712 can flexibly adapt to the telescopic stroke of the top wheel 4, adjusting the extension distance of the top wheel 4 according to the bending radius of the pipe fitting. Furthermore, there is no additional shaking during transmission, ensuring that the top wheel 4 always acts on the pipe fitting in a preset direction, further improving the accuracy of the bending angle and curvature. This also reduces manual labor intensity and improves the reliability and safety of pipe bending.

[0034] In other alternative embodiments, to further improve the reliability of pipe bending, such as Figure 1 and Figure 2As shown, the pipe bending machine also includes a limiting device 72 disposed on the upper part of the driving device 71. The limiting device 72 is used to limit the extension distance of the top wheel 4. The pipe bending machine frame 1 is provided with a positioning block 8 opposite to the limiting device 72. The limiting device 72 includes a connecting bracket 721 disposed on the upper part of the top wheel 4 and a limiting member 722 connected to the connecting bracket 721. The top of the pipe bending machine frame 1 is provided with a sliding hole 111. The positioning block 8 is disposed on the upper part of the pipe bending machine frame 1. The connecting bracket 721 extends at least partially through the sliding hole 111 to the top of the pipe bending machine frame 1, so that the limiting member 722 is installed on the top wheel 4. The top plate 111 is located above the pipe bending machine frame 1 and opposite to the positioning block 8. Specifically, the sliding hole 111 extends longitudinally through the top plate 11 and extends along the central axis S of the pipe bending machine frame 1. The positioning block 8 is located on the upper part of the top plate 11 and at one end of the sliding hole 111 away from the driving device 71. The connecting bracket 721 is located on the upper part of the top wheel 4 and corresponds to the sliding hole 111, so that the top of the connecting bracket 721 can extend upward through the sliding hole 111 to the top of the pipe bending machine frame 1. The limiting member 722 is connected to the top of the connecting bracket 721 and faces the positioning block 8.

[0035] By setting the limiting device 72 in the pipe bending machine, the maximum extension distance of the top wheel 4 can be precisely controlled, avoiding excessive extension of the top wheel 4 due to excessive power output from the drive device 71. In practical applications, when the top wheel 4 moves telescopically via the transmission rod 712, the limiting device 72 can be driven to slide back and forth via the transmission rod 712. When the transmission rod 712 drives the top wheel 4 to extend to the preset position, the limiting device 722 will precisely abut against the positioning block 8, forcing the top wheel 4 to stop moving, ensuring that the extension amount of the top wheel 4 is consistent each time it bends, thereby ensuring uniform bending angle and curvature of the pipe bending component. This effectively solves the problems of "over-bending" and "under-bending" that are easily caused by manual control or simply driving the device 71, and is especially suitable for batch processing. The high requirements for the consistency of pipe dimensions during mass production; at the same time, the limiting device 72 and the transmission rod 712 move synchronously, and the limiting response is more timely. It can quickly prevent the top wheel 4 from moving beyond its travel, reduce equipment failures such as excessive deformation of pipes caused by excessive extension of the top wheel 4, damage to the top wheel 4 or the transmission rod 712, and extend the service life of the drive device 71 and the top wheel 4; in addition, the connecting bracket 721 can extend through the sliding hole 111 to the top of the pipe bending machine frame 1 and install the limiting device 722. This allows the limiting device 722 and the positioning block 8 to form a visual limiting fit on the upper part of the pipe bending machine frame 1, which is convenient for operators to observe the limiting status. It also avoids the limiting device 72 occupying the bending space inside the pipe bending machine frame 1, and does not affect the placement of pipes in the cavity 13 and the pipe bending process.

[0036] Further optional, such as Figure 1 and Figure 2As shown, the connecting bracket 721 can be configured as an L-shaped bracket, and the vertical part of the connecting bracket 721 can be fixedly connected to the upper part of the top wheel 4 by welding or other means; the limiting member 722 is fixedly connected to the end of the horizontal part of the connecting bracket 721. Further optionally, the limiting member 722 can be installed at the end of the connecting bracket 721 by threaded connection or other means.

[0037] In some alternative embodiments, the pipe bending machine further includes an adjustment device connected to the limiting device 72 and the connecting bracket 721. The adjusting device allows the limiting member 722 to be telescopically connected to the connecting bracket 721. In practical applications, the distance between the limiting member 722 and the positioning block 8 can be adjusted according to the telescopic amount of the top wheel 4. Optionally, the connecting bracket 721 has a connecting hole facing the positioning block 8. The adjusting device includes an adjusting hole located on the top of the connecting bracket 721 and communicating with the connecting hole, and an adjusting screw adapted to the adjusting hole. The limiting member 722 is slidably disposed in the connecting hole to facilitate adjustment of the extension length of the limiting member 722 relative to the connecting bracket 721, thereby achieving fine adjustment of the distance between the limiting member 722 and the positioning block 8. At the same time, the adjusting screw fixes the limiting member 722 to improve the reliability of the limiting device 72. The adjusting device has a simple structure and is easy to implement. In practical applications, the adjusting hole can be configured as an internally threaded hole. The adjusting screw is threadedly connected to the adjusting hole and moves up and down within the adjusting hole. When the adjusting screw moves down and abuts against the top of the limiting member 722, the limiting member 722 is fixed within the connecting hole. When the adjusting screw moves up to loosen the limiting member 722, the limiting member 722 can extend and retract along the connecting hole under external force, thereby adjusting the extension length of the limiting member 722.

[0038] The above examples are merely illustrative of the technical content of this utility model to facilitate reader understanding, but do not imply that the implementation of this utility model is limited to these embodiments. Any technical extensions or re-creations made based on this utility model are protected by this utility model. The scope of protection of this utility model is defined by the claims.

Claims

1. A pipe bender characterized by comprising: The device includes a pipe bending frame (1), a top wheel (4) that can extend and retract within the pipe bending frame (1), force-bearing wheels (5) spaced apart on both sides of the pipe bending frame (1), and a fixing member (6). The pipe bending frame (1) has a cavity (13) that communicates with the outside. The force-bearing wheels (5) are rotatably disposed within the cavity (13). The fixing member (6) and the force-bearing wheels (5) are correspondingly arranged along the extension direction of the top wheel (4), and there is a pipe fixing position (131) between the fixing member (6) and the force-bearing wheels (5) that communicates with the cavity (13).

2. A pipe bender as claimed in claim 1, characterised in that Along the extension and retraction direction of the top wheel (4), the force-bearing wheel (5) is installed on the oblique outer side of the fixing member (6).

3. A pipe bender as claimed in claim 1, wherein, The pipe bending machine frame (1) includes a top plate (11) and a bottom plate (12) located below the top plate (11). The top plate (11) and the bottom plate (12) are spaced apart vertically to form the cavity (13). The top wheel (4) moves telescopically within the cavity (13) relative to the pipe fitting fixing position (131).

4. A pipe bender as claimed in claim 3, wherein the pipe bender is configured to bend the pipe to a predetermined bend angle. The pipe bending machine frame (1) is provided with a first mounting structure (2) and a second mounting structure (3) symmetrically distributed on both sides. The first mounting structure (2) and the second mounting structure (3) are respectively located on both sides of the pipe fitting fixing position (131). The first mounting structure (2) is used to install the force-bearing wheel (5), and the second mounting structure (3) is used to install the fixing member (6). The first mounting structure (2) includes a first mounting hole (21) extending longitudinally through the top plate (11) and the bottom plate (12). The second mounting structure (3) includes a second mounting hole (31) extending longitudinally through the top plate (11) and the bottom plate (12). The force-bearing wheel (5) is rotatably connected between the two corresponding first mounting holes (21) and the fixing member (6) passes through the pipe bending machine frame (1) along the two corresponding second mounting holes (31).

5. A tube bender as defined in claim 4 wherein, The first mounting hole (21) is provided in a plurality of them, and each first mounting hole (21) is provided at equal intervals along the first distribution path (211). The first distribution path (211) and the central axis S of the bending frame (1) have a first preset angle (212). The second mounting hole (31) is provided in a plurality of them. Each second mounting hole (31) is provided at equal intervals along the second distribution path (311). The second distribution path (311) and the central axis S of the bending frame (1) have a second preset angle (312). The second preset angle (312) is equal to the first preset angle (212).

6. A pipe bender as claimed in claim 3, wherein, The outer wall of the force-bearing wheel (5) is provided with a number of force-bearing grooves (51) distributed along the circumference, and each of the force-bearing grooves (51) is higher than the bottom plate (12).

7. A pipe bender as defined in claim 1 wherein, The top wheel (4) is provided with a top wheel groove (41) facing the pipe fixing position (131).

8. A tube bender as claimed in any one of claims 1 to 7, characterised in that, It also includes a body assembly (7) connected to the bending frame (1), the body assembly (7) including a drive device (71) connected to the top wheel (4), the drive device (71) being used to drive the top wheel (4) to move telescopically; the drive device (71) includes a driver (711) and a transmission rod (712) disposed between the driver (711) and the top wheel (4).

9. A tube bender as defined in claim 8, wherein It also includes a limiting device (72) located on the upper part of the drive device (71), the limiting device (72) is used to limit the extension distance of the top wheel (4), and the pipe bending frame (1) is provided with a positioning block (8) opposite to the limiting device (72).

10. A tube bender as defined in claim 9, wherein The limiting device (72) includes a connecting bracket (721) located on the top of the top wheel (4) and a limiting member (722) connected to the connecting bracket (721). The top of the pipe bending machine frame (1) is provided with a sliding hole (111). The positioning block (8) is located on the top of the pipe bending machine frame (1). The connecting bracket (721) extends at least partially through the sliding hole (111) to the top of the pipe bending machine frame (1) so that the limiting member (722) is installed above the pipe bending machine frame (1) and is opposite to the positioning block (8).

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