Adjustable push-bending type pipe bending machine for large bending radius

Abstract

The invention relates to the technical field of pipe bending, and discloses an adjustable push-bending type pipe bending machine for a large bending radius, which comprises a frame-shaped rack, a pipe bending die which is arranged on the frame-shaped rack and is formed by a plurality of sliding modules in a linear array, and a plurality of oil cylinder assemblies which are arranged on the frame-shaped rack and are opposite to the pipe bending die, the sliding module comprises a groove body, a sliding plate movably arranged in the groove body, a locking pressing groove for locking the sliding plate in the groove body through a locking bolt, a plurality of floating wheel mechanisms arranged on the two sides of the sliding plate and an arc plate arranged on the sliding plate, the arc plate is provided with a bent arc opening, a first rack is arranged at the groove bottom of the groove body, and a second rack is arranged at the groove bottom of the locking pressing groove. Meshing teeth meshed with the first rack and the second rack are arranged at the bottom and the top of the sliding plate respectively, a sliding groove allowing the floating wheel mechanism to move is formed in the groove body, and the floating mechanism is used for supporting the sliding plate to be separated from the first rack. According to the pipe bending device, the bending radius can be quickly adjusted, the adjustment range is wide, adjustment is simple and labor-saving, and the pipe bending precision and quality can be ensured.

Description

Technical Field

[0002] This invention relates to the field of pipe bending technology, and in particular to an adjustable push-bending pipe bending machine for large bending radii, suitable for pushing-bending pipes with a bending radius R≥17000mm. Background Technology

[0004] In the field of pipe bending, pipe bending is a common process. Push-bending pipe bending machines, as one of the commonly used pipe bending equipment, apply a pushing force to the pipe, causing it to bend and deform under the action of a die. However, existing push-bending pipe bending machines have several shortcomings when dealing with large bending radius requirements: I. Traditional push-bending machines have a limited range of adjustable bending radii, making it difficult to meet diverse production needs. Many industries, such as construction, aerospace, and shipbuilding, often require profiles and pipes with large bending radii to achieve specific structural designs and functional requirements, and existing equipment cannot adequately meet these needs.

[0005] Second, existing pipe bending machines often use large molds when adjusting the bending radius, which are difficult to load and unload. This often requires a lot of time for debugging and mold replacement, resulting in low production efficiency and increased costs. Moreover, they are generally unsuitable for bending existing large-specification (φ400~φ600) thick-walled pipes, with problems such as insufficient power, unstable clamping, difficulty in controlling springback accuracy, and surface scratches and indentations.

[0006] Based on this, this application provides an adjustable push-bending pipe bending machine for large bending radii to solve the problems of limited bending radius adjustment range, complex operation, difficulty in debugging and replacing bending molds, and difficulty in ensuring the bending accuracy and surface quality of large bending radii in existing pipe bending machines. Summary of the Invention

[0008] This invention aims to solve the technical problems existing in the prior art. To this end, this invention provides an adjustable push-bending pipe bending machine for large bending radii that is convenient to adjust, simple to adjust, has a wide adjustment range, and can ensure bending accuracy and surface quality.

[0009] The technical solution adopted by this invention to solve its technical problem is: An adjustable push-bending pipe bending machine for large bending radii is provided, comprising a frame frame, a bending die consisting of a linear array of multiple sliding modules located inside the front end of the frame frame, and multiple hydraulic cylinder assemblies located at the rear end of the frame frame opposite to the bending die for pushing the pipe towards the bending die. Each sliding module includes a groove, a sliding plate, a locking groove, a locking bolt, a floating wheel mechanism, and an arc plate. The arc plate is detachably mounted on the front end of the sliding plate and has a bending arc opening that matches the pipe material. The rear end of the slide is located in the groove. One end of the locking groove is hinged to the rear end of the groove to press the slide into the groove. It is locked to the groove by multiple locking bolts. The bottom of the groove is provided with a first rack, and the bottom of the locking groove is provided with a second rack. The bottom and top of the slide are respectively provided with meshing teeth that mesh with the first rack and the second rack. Multiple floating wheel mechanisms are provided on both sides of the slide to support the slide and disengage it from the first rack. The groove is provided with a sliding groove for the floating wheel mechanism to move.

[0010] In some alternative embodiments, the sliding plate and the arc plate are joined by a mortise and tenon joint, and multiple longitudinal and transverse reinforcing ribs are provided on both sides, wherein the longitudinal reinforcing ribs are arc-shaped ribs.

[0011] In some optional embodiments, the trough includes a bottom trough, a column at the rear end of the bottom trough, and locking frames on both sides of the bottom trough. The locking frame consists of multiple upright plates, a pressure welding plate at the top of the upright plates, and an intermediate support at the inner side of the middle of the upright plates. The inner side of the upright plates is set as an arc shape matching the longitudinal reinforcing ribs. The intermediate support is provided with a relief groove that can accommodate the transverse reinforcing ribs, and the width of the relief groove is greater than the sum of the thickness of the transverse reinforcing ribs and the depth of the meshing teeth on the slide plate.

[0012] In some optional embodiments, a limiting groove is provided on one side of the groove, and a locking block is provided on the other side to engage with the limiting groove. The length of the limiting groove and the locking block is equal to the length of the groove, and two adjacent sliding modules are engaged with each other through the limiting groove and the locking block.

[0013] In some optional embodiments, the floating wheel mechanism consists of a fixed block, a screw, a support block, a support wheel, a support spring, and a nut. The support wheel is rotatably mounted on the support block via a pin. The screw is threaded through the fixed block and connected to the support block. The support spring is located on the screw between the support block and the fixed block. The nut is screwed to the screw and located above the fixed block.

[0014] In some optional embodiments, the frame is welded from multiple trusses, including a left frame, a right frame, a front transverse truss, a rear transverse truss, and a longitudinal truss. The left and right frames are both "U"-shaped structures welded from the trusses. The two ends of the front transverse truss are welded to the middle of the left and right frames, serving as the installation base for the bending mold. The two rear transverse trusses are welded to the top and bottom between the left and right frames, respectively. One end of the two longitudinal trusses is welded to the left and right frames, respectively, located between the two rear transverse trusses, serving as the installation base for the hydraulic cylinder assembly.

[0015] In some alternative embodiments, the truss includes main chords, vertical web members, horizontal web members, and diagonal web members. The four main chords are arranged in a rectangular array to form the main body of the truss. Multiple vertical web members and horizontal web members are provided on the main body of the truss for connecting the main chords. The diagonal web members are provided between two adjacent horizontal web members and vertical web members.

[0016] In some alternative embodiments, the cylinder assembly includes a cylinder, a cylinder retaining sleeve, and an arc-shaped push plate. The cylinder is fixedly installed on the side of the longitudinal truss by the cylinder retaining sleeve, and the arc-shaped push plate is installed on the top rod of the cylinder by a pin.

[0017] In some optional embodiments, a connecting truss is provided between the two longitudinal trusses of the frame frame, and a sliding module is provided on the inner side of the connecting truss. The tail of the hydraulic cylinder assembly is fixed on the slider of the sliding module, and the head of the hydraulic cylinder assembly is movably supported on the rear transverse truss by a sliding plate.

[0018] In some optional embodiments, a base and a cylinder support are also included. The base is disposed within the frame and is used to support and fix the bending die. The cylinder support is disposed below the cylinder assembly and is used to support and fix the cylinder assembly.

[0019] Compared with the prior art, the beneficial effects of the present invention are: 1. The bending die designed in this invention is composed of a linear array of multiple sliding modules, and each sliding module can adjust the extension amount of the slide plate extending from the groove. This design can flexibly combine different bending radii to achieve a wide range of bending radius adjustment, meet various complex production needs, and expand the application field of the equipment. 2. The designed sliding module uses a rack and pinion meshing method to fix the slide plate in the groove with a locking groove. The floating wheel mechanism allows the slide plate to float in the groove when the locking groove is released, so that the slide plate is disengaged from the rack at the bottom of the groove. This allows for quick and easy adjustment of the slide plate position, effectively reducing the technical requirements for operators. Compared with traditional pipe bending machines, it reduces the time for hoisting, installation, and debugging, and improves production efficiency. 3. The bending radius can be precisely adjusted through the bending die to ensure the accuracy of the bending to the maximum extent. When the pipe is bent, it is within the arc opening of the arc plate on the bending die, which can effectively position and support the pipe, effectively prevent the pipe from deviating and shaking, and ensure the quality of the bending. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a three-dimensional assembly drawing of the adjustable push-bending pipe bending machine with a large bending radius provided by the present invention. Figure 2 yes Figure 1 Top view of an adjustable push-bend pipe bending machine with a large bending radius; Figure 3 This is a structural schematic diagram of the sliding module (without the arc plate) provided by the present invention; Figure 4 yes Figure 3 The provided assembly structure diagram of the groove and the locking groove; Figure 5 yes Figure 3 The provided assembly structure diagram of the skateboard and the arc plate; Figure 6 yes Figure 3 A schematic diagram of the floating wheel mechanism is provided. Figure 7 This is a schematic diagram of the truss structure provided by the present invention; Figure 8 This is a structural schematic diagram provided in Embodiment 3.

[0022] The attached diagram lists the components represented by each number as follows: Frame-type frame 1, left frame 1.1, right frame 1.2, front transverse truss 1.3, rear transverse truss 1.4, longitudinal truss 1.5, connecting truss 1.6, truss a, main chord a.1, vertical web members a.2, horizontal web members a.3 and diagonal web members a.4, sliding module 2, trough 2.1, bottom trough 2.1.1, column 2.1.2, upright plate 2.1.3, lower pressure welding plate 2.1.4, intermediate support 2.1.5, limiting groove 2.1.6, locking block 2.1.7, sliding plate 2.2, meshing teeth 2.2.1, longitudinal reinforcement 2.2.2, 2.2.3, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 2.1, 2.2.2, 2.2.3, 2.3, 2.4, 2.5, 2.5, 2.6, 2.6, 2.6.1, 2.7, 2.8, 2.9, 2.1, 2.2, 2.2, 2.3, 2.4, 2.5, 2.5, 2.5, 2.6, 2.6, 2.6, 2.6.1, 2.7, 2.8, 2.9, 2.1, 3.2, 3.3, 3.4, 2.5, 2.5, 2.6, 2.6, 2.6, 2.7, 2.8, 2.9, 3.1, 3.2, 3.3, 3.4, 3.5, 4.2, 5.3, 6.3, 4.3, 5.4, 6.5, 7.6, 8.5, 9.5, 10.3, 1.4, 2.5, 2.5, 2.5, 2.6, 2.7, 2.8, 2.9, 2.1, 2.2, 2.2, 2.2, 2.2, 2.3, 2.4 ...9, 2. Detailed Implementation

[0024] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," etc., used in this invention are 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. The terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0028] Example 1 As attached Figure 1 and attached Figure 2 As shown, this embodiment provides an adjustable push-bending pipe bending machine for large bending radii, including a frame frame 1, a bending die consisting of a linear array of multiple sliding modules 2 located on the inner front side of the frame frame 1, and multiple hydraulic cylinder assemblies 3 located at the rear end of the frame frame 1 opposite to the bending die for pushing the pipe 10 towards the bending die, wherein: As attached Figure 1 As shown, the frame 1 is welded from multiple trusses, including a left frame 1.1, a right frame 1.2, a front transverse truss 1.3, a rear transverse truss 1.4, and a longitudinal truss 1.5. The left frame 1.1 and the right frame 1.2 are both welded from trusses a to form an "U"-shaped structure. The two ends of the front transverse truss 1.3 are welded to the middle of the left frame 1.1 and the right frame 1.2, serving as the installation base for the bending mold (i.e., the bending mold is fixedly installed on the rear transverse truss). The two rear transverse trusses 1.4 are respectively welded to the top and bottom between the left frame 1.1 and the right frame 1.2. One end of the two longitudinal trusses 1.5 are respectively welded to the left frame 1.1 and the right frame 1.2, located between the two rear transverse trusses 1.4, serving as the installation base for the hydraulic cylinder assembly 3.

[0029] Preferred options are listed below. Figure 7 As shown, the truss a in this embodiment includes a main chord a.1, vertical web members a.2, horizontal web members a.3, and diagonal web members a.4. The four main chords are arranged in a rectangular array to form the main body of the truss. Multiple vertical web members and horizontal web members are provided on the main body of the truss to tie the main chords. The diagonal web members are provided between two adjacent horizontal web members and vertical web members to enhance the structural strength of the truss.

[0030] The frame frame designed in this embodiment is used to install the pipe bending mold and the hydraulic cylinder assembly. Its core function is to stably transmit the thrust of the hydraulic cylinder assembly to the pipe bending through the unique structural form and spatial arrangement of the frame frame itself, so as to ensure the stability of the structure.

[0031] As attached Figure 1 and attached Figure 2 As shown, the hydraulic cylinder assembly 3 includes a hydraulic cylinder 3.1, a hydraulic cylinder fixing sleeve 3.2, and an arc-shaped push plate 3.3. The hydraulic cylinder 3.1 is fixedly installed on the side of the longitudinal truss 1.5 via the hydraulic cylinder fixing sleeve 3.2, and the arc-shaped push plate 3.3 is installed on the push rod of the hydraulic cylinder 3.1 via a pin. In this embodiment, the hydraulic cylinder provides the power required for bending the pipe. This embodiment has two hydraulic cylinder assemblies, which are symmetrically arranged to provide the same thrust, facilitating the control of the hydraulic cylinders.

[0032] As attached Figure 3 and attached Figure 5 As shown, the sliding module 2 includes a groove 2.1, a sliding plate 2.2, a locking groove 2.3, a locking bolt 2.4, a floating wheel mechanism 2.5, and an arc plate 2.6, wherein: The arc plate 2.6 is detachably mounted on the front end of the slide plate 2.2, and has a curved opening 2.6.1 that matches the pipe material, which can be used to position and support the pipe material. The detachable mounting method of the arc plate 2.6 in this embodiment is as shown in the attached figure. Figure 5 As shown, the sliding plate 2.2 and the arc plate 2.6 are connected by a tongue and groove joint, preferably a "T" shaped tongue and groove joint. This detachable installation method facilitates the replacement of the arc plate to match the bending of pipes of different diameters.

[0033] As attached Figure 3 As shown, the rear end of the slide plate 2.2 is movably located within the groove 2.1, allowing for arbitrary adjustment of the slide plate's position within the groove. One end of the locking groove 2.3 is hinged to the rear end of the groove 2.1, used to press the slide plate 2.2 firmly within the groove 2.1, and is locked to the groove 2.1 by multiple locking bolts 2.4.

[0034] Preferably, to ensure the stability of the slide plate at any position within the groove, this embodiment provides a first rack 2.7 at the bottom of the groove 2.1 and a second rack 2.8 at the bottom of the locking groove 2.3. Simultaneously, meshing teeth 2.2.1, engaging with the first rack 2.7 and the second rack 2.8, are respectively provided at the bottom and top of the slide plate 2.2. When the slide plate is pressed into the groove by the locking groove, the bottom and top of the slide plate engage with the first and second racks respectively to achieve position locking. In this embodiment, the minimum adjustment distance of the slide plate is the pitch of the meshing teeth; preferably, the minimum adjustment distance of the slide plate is 5mm.

[0035] Furthermore, to facilitate the adjustment of the slide plate, this embodiment provides multiple floating wheel mechanisms 2.5 on both sides of the slide plate 2.2, and a sliding groove 2.2 for the floating wheel mechanisms to move within the groove. When the locking groove is released, the floating wheel mechanisms lift the slide plate, disengaging it from the first rack at the bottom of the groove. Simultaneously, the slide plate experiences rolling friction with the groove during movement, enabling rapid movement of the slide plate's position. Preferably, as shown in the attached... Figure 6 As shown, the floating wheel mechanism 2.5 in this embodiment consists of a fixed block 2.5.1, a screw 2.5.2, a support block 2.5.3, a support wheel 2.5.4, a support spring 2.5.5, and a nut 2.5.6. The support wheel 2.5.4 is rotatably mounted on the support block 2.5.3 via a pin. The screw 2.5.2 is threaded through the fixed block 2.5.1 and connected to the support block 2.5.3. The support spring 2.5.5 is located on the screw 2.5.2 between the support block and the fixed block. The nut 2.5.6 is screwed to the screw 2.5.5 and located above the fixed block.

[0036] Preferably, in order to improve the structural strength of the skateboard, as shown in the attached... Figure 5 As shown, in this embodiment, multiple longitudinal reinforcing ribs 2.2.2 and transverse reinforcing ribs 2.2.3 are provided on both sides of the slide plate 2.2, and the longitudinal reinforcing ribs are preferably arc-shaped ribs.

[0037] As attached Figure 3 and attached Figure 4 As shown, the trough 2.1 includes a bottom trough 2.1.1, a column 2.1.2 located at the rear end of the bottom trough, and locking frames located on both sides of the bottom trough. The locking frames consist of multiple upright plates 2.1.3, a pressure welding plate 2.1.4 located at the top of the upright plates, and an intermediate support 2.1.5 located on the inner side of the middle of the upright plates. The inner side of the upright plates 2.1.3 is designed with an arc shape that matches the longitudinal reinforcing rib 2.2.2. The intermediate support 2.1.5 is provided with a clearance groove that can accommodate the transverse reinforcing rib 2.2.3, and the width of the clearance groove is greater than the sum of the thickness of the transverse reinforcing rib 2.2.3 and the depth of the meshing teeth 2.2.1 on the slide plate 2.2. This design does not affect the upward floating of the slide plate under the floating wheel mechanism.

[0038] The sliding module designed in this embodiment consists of a bottom groove, a column, and a locking frame, forming a hollow cage-like space. A sliding plate is placed inside the cage-like space. When the locking groove is opened, the sliding plate is supported by multiple floating wheel mechanisms, allowing it to move flexibly back and forth. When the locking groove is closed, the first rack in the bottom and top of the sliding plate respectively meshes with the second rack in the locking groove to lock the position and restrict the movement of the sliding plate. Multiple such sliding modules can be combined to form the desired near-ideal bending radius.

[0039] Preferably, in this embodiment, a limiting groove 2.1.6 is provided on one side of the groove 2.1, and a locking block 2.1.7 is provided on the other side to engage with the limiting groove. The length of the limiting groove and the locking block is equal to the length of the groove. Adjacent sliding modules are engaged with each other through the limiting groove and the locking block, so that all sliding modules are connected into a whole.

[0040] When performing pipe bending with a large bending radius, follow these steps: First, adjust the slide plate on each sliding module in the bending die according to the required bending radius, so that the slide plate of each sliding module is adjusted to the appropriate position and angle, and the arc plates of each sliding module are combined to form the bending die cavity with the required radius. Then, the pipe to be bent is hoisted to a suitable position in the bending work area and placed on a movable trolley; The trolley then moves and pushes the pipe into the bending mold cavity, where it is positioned and supported. The hydraulic cylinder assembly applies thrust, and by continuously increasing the thrust of the hydraulic cylinder, the pipe deforms according to the bending mold cavity to the required bending radius.

[0041] Example 2 Based on Example 1, as shown in the appendix Figure 1 and attached Figure 2 As shown, this embodiment also includes a base 4 and a cylinder support 5. The base 4 is located inside the frame 1 and is used to support and fix the bending die, which can effectively improve the service life of the bending die and the frame. The cylinder support 5 is located below the cylinder assembly 3 and is used to support and fix the cylinder assembly, which can effectively improve the service life of the cylinder assembly and the frame.

[0042] Example 3 The only difference from Embodiment 1 is the installation method of the hydraulic cylinder assembly. In this embodiment, a connecting truss 1.6 is provided between the two longitudinal trusses 1.5 of the frame frame 1. The inner side of the connecting truss 1.6 is provided with a sliding module 6. The tail of the hydraulic cylinder assembly 3 is fixed on the slider of the sliding module 6, and the head of the hydraulic cylinder assembly 3 is movably supported on the rear transverse truss 1.4 by a sliding plate (not shown in the figure). This design allows for adjustment of the spacing between the hydraulic cylinder assemblies to meet the bending requirements of pipes of different lengths.

[0043] It is worth noting that in the above embodiment, the bending requirements of the square tube can be met by removing the arc plate on the sliding module.

[0044] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An adjustable push-bending pipe bending machine for large bending radii, characterized in that, The assembly includes a frame-type machine, a pipe bending die consisting of a linear array of multiple sliding modules located inside the front end of the frame-type machine, and multiple hydraulic cylinder assemblies located at the rear end of the frame-type machine opposite to the pipe bending die for pushing the pipe towards the pipe bending die, wherein: The sliding module includes a groove, a sliding plate, a locking groove, locking bolts, a floating wheel mechanism, and an arc plate. The arc plate is detachably installed at the front end of the sliding plate and has a curved opening that matches the pipe material. The rear end of the sliding plate is movably disposed in the groove. One end of the locking groove is hinged to the rear end of the groove to press the sliding plate into the groove. It is locked to the groove by multiple locking bolts. The bottom of the groove has a first rack, and the bottom of the locking groove has a second rack. The bottom and top of the sliding plate have meshing teeth that mesh with the first and second racks, respectively. Multiple floating wheel mechanisms are disposed on both sides of the sliding plate to support the sliding plate and disengage it from the first rack. The groove has a sliding groove for the floating wheel mechanism to move.

2. The adjustable push-bending pipe bending machine for large bending radius according to claim 1, characterized in that, The sliding plate and the arc plate are connected by a mortise and tenon joint, and multiple longitudinal and transverse reinforcing ribs are provided on both sides. The longitudinal reinforcing ribs are arc-shaped ribs.

3. The adjustable push-bending pipe bending machine for large bending radius according to claim 2, characterized in that, The trough includes a bottom trough, a column at the rear end of the bottom trough, and locking frames on both sides of the bottom trough. The locking frame consists of multiple upright plates, a pressure welding plate at the top of the upright plates, and an intermediate support at the inner side of the middle of the upright plates. The inner side of the upright plates is set as an arc shape that matches the longitudinal reinforcing ribs. The intermediate support is provided with a relief groove that can accommodate the transverse reinforcing ribs, and the width of the relief groove is greater than the sum of the thickness of the transverse reinforcing ribs and the depth of the meshing teeth on the slide plate.

4. The adjustable push-bending pipe bending machine for large bending radius according to claim 1, characterized in that, One side of the groove is provided with a limiting groove, and the other side is provided with a locking block that engages with the limiting groove. The length of the limiting groove and the locking block is equal to the length of the groove. Adjacent sliding modules are engaged with each other through the limiting groove and the locking block.

5. The adjustable push-bending pipe bending machine for large bending radius according to claim 1, characterized in that, The floating wheel mechanism consists of a fixed block, a screw, a support block, a support wheel, a support spring, and a nut. The support wheel is rotatably mounted on the support block via a pin. The screw is threaded through the fixed block and connected to the support block. The support spring is located on the screw between the support block and the fixed block. The nut is screwed to the screw and located above the fixed block.

6. The adjustable push-bending pipe bending machine for large bending radius according to claim 1, characterized in that, The frame is welded from multiple trusses, including a left frame, a right frame, a front transverse truss, a rear transverse truss, and a longitudinal truss. The left and right frames are both "U"-shaped structures welded from the trusses. The two ends of the front transverse truss are welded to the middle of the left and right frames, serving as the installation base for the bending mold. The two rear transverse trusses are welded to the top and bottom of the left and right frames, respectively. One end of the two longitudinal trusses is welded to the left and right frames, respectively, located between the two rear transverse trusses, serving as the installation base for the hydraulic cylinder assembly.

7. The adjustable push-bending pipe bending machine for large bending radius according to claim 6, characterized in that, The truss includes main chords, vertical web members, horizontal web members, and diagonal web members. The four main chords are arranged in a rectangular array to form the main body of the truss. Multiple vertical web members and horizontal web members are provided on the main body of the truss to tie the main chords. The diagonal web members are provided between two adjacent horizontal web members and vertical web members.

8. The adjustable push-bending pipe bending machine for large bending radius according to claim 6, characterized in that, The hydraulic cylinder assembly includes a hydraulic cylinder, a hydraulic cylinder fixing sleeve, and an arc-shaped push tube plate. The hydraulic cylinder is fixedly installed on the side of the longitudinal truss by the hydraulic cylinder fixing sleeve, and the arc-shaped push tube plate is installed on the top rod of the hydraulic cylinder by a pin.

9. The adjustable push-bending pipe bending machine for large bending radius according to claim 6, characterized in that, A connecting truss is provided between the two longitudinal trusses of the frame frame. A sliding module is provided on the inner side of the connecting truss. The tail of the hydraulic cylinder assembly is fixed on the slider of the sliding module, and the head of the hydraulic cylinder assembly is movably supported on the rear transverse truss by a sliding plate.

10. The adjustable push-bending pipe bending machine for large bending radii according to any one of claims 1 to 8, characterized in that, It also includes a base and a cylinder support seat. The base is located inside the frame and is used to support and fix the pipe bending mold. The cylinder support seat is located below the cylinder assembly and is used to support and fix the cylinder assembly.

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