A pipe bending machine

Abstract

The present disclosure relates to the technical field of pipe bending machines, and provides a pipe bending machine, which includes a machine body, wherein the machine body has two guide platforms, and the guide platforms have an inclined section; a front supporting seat is lifted and swung on the machine body, and is arranged in an inclined manner after swinging; a rear supporting seat is lifted and arranged on the machine body, is located below the guide platforms, and has an interval space between the rear supporting seat and the front supporting seat, and is close to the lower end of the inclined front supporting seat and is located in the inclined direction of the inclined section; a top seat is arranged on the machine body and above the interval space, and is used to support the bending part of the pipe fitting; the base is horizontal and lifted on the machine body, and is located in the interval space, and is used to abut against the pipe fitting and push the pipe fitting up, thereby solving the technical problems in the related art of manually adjusting the lifting position to maintain the dynamic balance of the pipe fitting, which causes the pipe fitting bending process to be cumbersome and the offset error to be large.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the technical field of pipe bending machines, and in particular, to a pipe bending machine. Background Art

[0002] With the large-scale construction of long-distance oil and gas pipeline projects in my country, the demand for on-site cold bending of ultra-large diameter steel pipes (such as 1422mm in diameter) is becoming increasingly urgent. Traditional vertical hydraulic pipe bendering machines are prone to axial displacement or radial tipping during the forming process due to the huge weight of the pipe and the uneven distribution of the bending torque. To overcome this problem, existing technologies generally rely on cranes to suspend and support the free ends of the steel pipes, and manually adjust the hoisting position to maintain the dynamic balance of the pipes. However, this auxiliary method has significant drawbacks:

[0003] One reason is that crane operation requires a specialized lifting team, and the coordinated operation with the pipe bending process is time-consuming. Statistics show that crane adjustment time for a single pipe bending operation accounts for over 30% of the total work time, severely hindering construction progress. Furthermore, the high cost of renting large lifting equipment and labor further drives up project costs.

[0004] Secondly, the crane relies on manual adjustment based on experience, making it difficult to respond in real time to changes in force during the pipe bending process. The coupling of hydraulic thrust, deadweight, and inertia forces on the pipe fittings can easily lead to large offset errors, resulting in deviations in the bend radius. This affects the ability of equipment such as welders and pigs to pass through the pipeline, as well as the overall strength of the pipeline. Summary of the Invention

[0005] To overcome the above-mentioned defects, the embodiments of the present disclosure provide a pipe bending machine that solves the technical problems in the related art of manually adjusting the lifting position to maintain the dynamic balance of the pipe, resulting in a cumbersome pipe bending process and large offset errors.

[0006] According to one aspect, at least one embodiment of the present disclosure provides a pipe bending machine, comprising: a machine body, the machine body having two guide platforms, the guide platforms having inclined sections, the inclined sections being arranged inclined along a height direction;

[0007] A front support seat, which is lifted and swung on the machine body and tilted after swinging, and is used to support a portion of one side of the bent portion of the pipe;

[0008] A rear support seat is arranged on the machine body in a lifting manner and is located below the guide platform. There is a space between the rear support seat and the front support seat, and the rear support seat is used to support the portion on the other side of the bend of the pipe. The rear support seat is close to the lower end of the inclined front support seat and is located in the inclined direction of the inclined section.

[0009] A top seat, which is arranged on the body and above the partition space, and is used to support the bending part of the pipe;

[0010] The base is horizontally and lifted on the machine body and is located in the interval space. Its height is higher or lower than the height of the front support seat and the rear support seat after lifting and moving. The base is used to abut against the pipe fitting and push the pipe fitting to rise.

[0011] For example, a pipe bending machine provided in at least one embodiment of the present disclosure further includes: a first roller, which is rotatably arranged on the machine body and is located on the side of the rear support seat away from the top seat, for supporting the bent portion of the pipe.

[0012] For example, a pipe bending machine provided in at least one embodiment of the present disclosure further includes: the guide platform also has a vertical section, the vertical section is located above the inclined section, and the interval between the vertical sections on both sides is adapted to the outer diameter of the pipe.

[0013] For example, a pipe bending machine provided in at least one embodiment of the present disclosure further includes: a second roller, the second roller having at least two, which are correspondingly rotatably arranged on the two guide platforms and located above the inclined section, and the interval between the two second rollers is adapted to the outer diameter of the pipe.

[0014] For example, in a pipe bender provided by at least one embodiment of the present disclosure, the base is composed of two guide wheels with parallel rotation axes, the machine body has a guide slope, the guide slope is arranged obliquely and is located in the spacing space, and the height of the guide slope gradually decreases from away from the rear support to closer to the rear support; the pipe bender further includes:

[0015] The movable frame is movably arranged on the guide slope, and the two guide wheels are both rotatably arranged on the movable frame.

[0016] For example, in a pipe bending machine provided in at least one embodiment of the present disclosure, the guide wheel is in a frustum shape, and the diameter of the end faces that are close to each other is smaller than the diameter of the end faces that are far away from each other.

[0017] For example, in a pipe bending machine provided by at least one embodiment of the present disclosure, the top seat has a first support section and a second support section arranged obliquely, the first support section and the second support section are connected to each other in a V shape, the connection point is an abutment portion, the abutment portion is used to abut with the pipe fitting, the first support section is inclined toward the front support seat, and the second support section is inclined toward the rear support seat.

[0018] For example, in a pipe bending machine provided by at least one embodiment of the present disclosure, the horizontal movement range of the base is located below the second supporting section.

[0019] For example, in a pipe bending machine provided in at least one embodiment of the present disclosure, the rear support seat is arranged on the machine body in a manner that it can be raised and lowered and swung.

[0020] For example, in a pipe bending machine provided by at least one embodiment of the present disclosure, an inner tube is movably arranged in the pipe, and the inner tube has a support block, and the support block is flexible.

[0021] The beneficial effects of the embodiments of the present disclosure are:

[0022] In the present disclosure, the base is used to support the pipe part close to the rear support seat. The base moves tiltedly. During the movement, the height and horizontal position both change. After rising, the pipe part close to the rear support seat is lifted up, and the top seat is cooperated to make the pipe on the rear support seat rise and the pipe on the front support seat fall down to fit the front support seat. At this time, the reel cooperates with the traction hook to pull and drive the pipe to move. During the movement of the pipe, the base moves synchronously. Its horizontal movement direction is in the same direction as the movement direction of the pipe, and during the horizontal movement, the height is synchronously reduced. The base always maintains support for the bending part until the pipe moves to the next bending position. After moving to the next bending position and preparing for the next bending, the rear support seat is moved so that the rear support seat forms a stable support for the pipe. Then the rear support seat and the front support seat are synchronously moved up so that the top seat abuts against the part to be bent. The front support seat is swung to perform the bending operation on the pipe. The machine's guide platform is equipped with an inclined section, which is tilted in the height direction. The rear support is located in the inclined direction of the inclined section. During the upward bending process of the pipe, it will pass through the guide platform, and the inclined section can guide the upward bending part of the pipe to ensure that its position does not shift laterally. In summary, the cooperation between the base and the machine's guide platform makes the pipe bending process more efficient, eliminating the need for a crane. The base also serves as an auxiliary transportation and lifting and bending function, achieving a multifunctional effect, improving work efficiency, reducing maintenance costs, and making operation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly describes the drawings required for use in describing the embodiments of the present disclosure. Obviously, the drawings described below are merely some exemplary embodiments of the present disclosure. Those skilled in the art can, without inventive effort, derive other drawings based on the content of the exemplary embodiments of the present disclosure and these drawings.

[0024] Figure 1 This is a schematic diagram of the overall structure of the pipe bending machine disclosed in the present invention;

[0025] Figure 2 for Figure 1 A partial enlarged schematic diagram of Figure 1;

[0026] Figure 3 This is a schematic diagram of the internal cross-sectional structure of the pipe bending machine disclosed herein;

[0027] Figure 4 This is a structural diagram of an embodiment of the pipe bending machine disclosed herein (with a second roller installed);

[0028] Figure 5 This is a structural schematic diagram of another embodiment of the pipe bending machine disclosed herein (without the second roller);

[0029] Figure 6 It is an enlarged structural schematic diagram of the reel part of the present invention;

[0030] Figure 7 This is a schematic diagram of the related driving and connection structures of the rear bracket disclosed in the present invention;

[0031] Figure 8 Schematic diagram of the initial operation of the pipe bending disclosed in this invention;

[0032] Figure 9 This is a schematic diagram of the subsequent bending operation of the pipe fitting disclosed herein;

[0033] Figure 10 Schematic diagram of the structure of the inner tube disclosed in the present invention;

[0034] Figure 11 It is a structural schematic diagram of the base, movable frame and driving member disclosed in the present invention.

[0035] In the figure: 1. Machine body; 101. Guide platform; 102. Inclined section; 103. Vertical section; 104. Guide slope; 105. Spacing space; 2. Front support seat; 3. Rear support seat; 4. Top seat; 401. First support section; 402. Second support section; 403. Abutment portion; 5. Base; 6. First roller; 7. Second roller; 8. Moving frame; 9. Inner tube; 901. Support block; 10. Reel; 12. Guide wheel; 13. Pipe fitting. DETAILED DESCRIPTION

[0036] The present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure, rather than to limit the present disclosure.

[0037] To simplify the drawings, only the parts relevant to the disclosure are schematically shown in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically shown or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0038] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on the specific circumstances.

[0039] In the present disclosure, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "up", "down", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present disclosure.

[0041] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0042] like Figures 1 to 11 As shown, it shows a pipe bending machine disclosed in the present invention, which is used to bend a pipe fitting 13. The machine body 1 has two guide platforms 101, and the guide platform 101 has an inclined section 102, which is arranged inclined along the height direction; the front supporting seat 2 is lifted and swung and is set on the machine body 1, and is arranged inclined after swinging. The front supporting seat 2 is used to support the part on one side of the bending part of the pipe fitting 13; the rear supporting seat 3 is lifted and set on the machine body 1, and is located below the guide platform 101, and has a spacing space 105 between it and the front supporting seat 2, for supporting the part on the other side of the bending part of the pipe fitting 13, the rear supporting seat 3 is close to the lower end of the inclined front supporting seat 2, and is located in the inclined direction of the inclined section 102; the top seat 4 is set on the machine body 1, above the spacing space 105, for supporting the bending part of the pipe fitting 13; the front supporting seat 2, the rear supporting seat 3 and the top seat 4 are preferably semicircular, adapted to the outer diameter of the pipe fitting 13 to be bent, so as to provide more stable support.

[0043] The overall working principle can be summarized as follows: first, place the pipe 13 to be bent on the front support seat 2, and hook one end of the pipe 13 through the reel 10 and the traction hook. By reeling in the reel 10, the pipe 13 is driven to move on the front support seat 2. At this time, the base 5 has the same height as the front support seat 2 and the rear support seat 3. The function of the base 5 is to assist in supporting and transporting the pipe 13.

[0044] The base 5 is horizontally and liftably arranged on the body 1 and is located in the partition space 105. Figure 2 As shown, its height is higher or lower than the height of the front support 2 and the rear support 3 after they are lifted and lowered. The base 5 is used to abut against the pipe 13 to assist in conveying the pipe 13 or to push the bent section of the pipe 13 upward. Specifically, the pipe 13 moves through the base 5 and partially enters the rear support 3 (during the initial bending operation, the length of the pipe 13 entering the rear support 3 is relatively small). At the same time, the position of the bent portion is adjusted and corrected. After the adjustment is completed, the front support 2 and the rear support 3 jointly support both sides of the lower pipe 13, and use linear drives (preferably cylinders) to drive the front support 2 and the rear support 3 to rise. The height of the front support 2 and the rear support 3 after they are raised is higher than the height of the base 5, as shown in FIG. Figure 8 As shown in B, Figure 8 As can be seen in B, the front support seat 2 is in an inclined state, which is the height after being lifted. It and the rear support seat 3 are both higher than the base 5 (marked as the guide wheel 12 in the figure), and the pipe fitting 13 is synchronously driven to rise, so that the top seat 4 abuts against the upper part of the pipe fitting 13. Through the mutual cooperation of the front support seat 2, the rear support seat 3 and the top seat 4, the pipe fitting 13 is stably fixed.

[0045] After the fixation is completed, the front bracket 2 is driven to swing (as Figure 8 As shown in Figure B), the pipe 13 is bent. After the bending is completed, the front support 2 swings back to the horizontal position. Since the pipe 13 carried by the front support 2 is long and therefore heavy, during the process of the front support 2 returning to the horizontal position, the pipe 13 on the front support 2 falls under the action of gravity. In contrast, the pipe 13 on the rear support 3 with a smaller length will tilt up (as shown in Figure B). Figure 8 As shown in C), the first bending of the pipe 13 is completed.

[0046] Then, continue to bend the pipe 13 at different locations for the second time (such as Figure 9As shown in the figure, a linear drive member (preferably an oil cylinder) is used to drive the front support seat 2 and the rear support seat 3 to descend, so that the base 5 is at the same height as the front support seat 2 and the rear support seat 3. The base 5 plays an auxiliary conveying role and provides a moving space for the pipe 13 in the bent state. The reel 10 is further rotated and reeled, driving the pipe 13 to move further from the front support seat 2 to the rear support seat 3. After the movement and positioning, the above operation is repeated. The front support seat 2, the top seat 4 and the rear support seat 3 jointly fix the pipe 13. The front support seat 2 swings to perform a bending operation on the second part of the pipe 13 (as shown in the figure). Figure 9 Typically, a single pipe 13 needs to be bent at multiple locations to achieve the final shape.

[0047] It is worth noting that when the pipe 13 on the front support 2 is long and heavy, the pipe 13 will drop under the action of gravity during the process of the front support 2 swinging back to horizontal, and will always keep in contact with the front support 2, so that the pipe 13 on the rear support 3 will naturally tilt up (such as Figure 8 As shown in C in the figure, as the pipe 13 continues to move, the length of the pipe 13 moved to the rear support 3 gradually increases, and the weight gradually increases. When its weight is greater than the weight of the pipe 13 on the front support 2, the pipe 13 cannot be restored to a horizontal position under the action of gravity. That is, after the front support 2 swings back to a horizontal position, the pipe 13 on the front support 2 is still in a bent upward state, as shown in FIG. Figure 9 As shown in Figure G. At this time, since both sides of the pipe 13 are bent, it is inconvenient to move and adjust the next bending position. In traditional technology, a crane is used for auxiliary operation to make the part on the front support seat 2 swing downward and stick to the front support seat 2, and then cooperate with the reel 10 and the towing hook to drive the pipe 13 to move further. The crane not only needs to overcome the gravity of the pipe 13 itself to prevent it from falling or deflecting, but also needs to overcome the deflection force applied to the pipe 13 by the reel 10 during the reeling process (because the reel 10 is usually located on the side of the pipe 13, when the pipe 13 is moved by the rope and the towing hook, as the pipe 13 moves closer to the reel 10, the angle between the rope and the pipe 13 gradually increases, so the component force in the non-moving direction gradually increases, and the deflection force applied to the pipe 13 also gradually increases).

[0048] In this solution, the base 5 serves to support the portion of the pipe 13 near the rear support 3. The base 5 tilts and moves, and during the movement, both the height and horizontal position change. After rising, the portion of the pipe 13 near the rear support 3 is lifted up, and in cooperation with the top seat 4, the pipe 13 on the rear support 3 is lifted up, and the pipe 13 on the front support 2 is lowered to fit the front support 2. At this time, the reel 10 cooperates with the traction hook to pull the pipe 13, and during the movement of the pipe 13, the base 5 moves synchronously with it. Its horizontal movement direction is the same as that of the pipe 13, and during the horizontal movement, the height is lowered synchronously. The base 5 always maintains support for the bent portion until the pipe 13 moves to the next bending position (such as Figure 9 As shown in H in the figure, it moves to the next bending position and prepares for the next bending. Then, the rear support seat 3 is moved so that the rear support seat 3 forms a stable support for the pipe 13. Then, the rear support seat 3 and the front support seat 2 are moved upward synchronously so that the top seat 4 contacts the part to be bent. The front support seat 2 is swung to bend the pipe 13.

[0049] The front support 2 can be vertically lifted and lowered along the body 1, and can be swung to adjust the tilt angle so that the whole is tilted. Figure 1 As shown, this solution provides a swinging drive method, in which a first oil cylinder and a second oil cylinder are respectively provided at both ends of the front support seat 2. The first oil cylinder and the second oil cylinder are driven independently, and can synchronously drive the front support seat 2 to maintain a horizontal rise. After rising to a suitable position, the first oil cylinder is stopped, and the second oil cylinder is controlled to continue driving, thereby driving one end of the front support seat 2 to continue to rise, so that the front support seat 2 as a whole is gradually tilted, thereby performing a bending operation on the pipe fitting 13.

[0050] Among them, the guide platform 101 of the machine body 1 is provided with an inclined section 102, which is arranged inclined in the height direction; the rear support seat 3 is located in the inclined direction of the inclined section 102; during the upward bending process of the pipe 13, it will pass through the guide platform 101, and the inclined section 102 can guide the upward bending part of the pipe 13 to ensure that its position does not shift laterally. In summary, through the cooperation between the base 5 and the guide platform 101 of the machine body 1, the pipe 13 is made more efficient during the bending process, without the need for a crane, and the base 5 also has the functions of assisting transportation and lifting and bending, achieving a multi-functional effect, improving work efficiency, reducing maintenance costs, and making operation more convenient.

[0051] In some examples, the first roller 6 is rotatably and liftably arranged on the machine body 1, such as Figure 2 、 3As shown in Figure 4, the rear support seat 3 is located on the side away from the top seat 4, and is used to support the bent portion of the pipe 13. The first roller 6 is located on the side away from the top seat 4, leaving space for the movement of the rear support seat 3. Its function is to cooperate with the base 5 to provide preliminary support to the bent portion, effectively preventing the pipe 13 from shifting. Specifically: after the first portion of the pipe 13 is bent, the pipe 13 needs to be moved to perform the bending operation on the next portion. At this time, the portion located on the rear support seat 3 is usually shorter and will automatically rise as the front support seat 2 descends (refer to the above description for the specific principle). Under the action of the reel 10 and the traction hook, it moves close to the first roller 6, so that the raised portion rests on the first roller 6, wherein the first roller 6 can be raised and lowered, as shown in Figure 4. Figure 3 and Figure 4 As shown, in this solution, the lifting and lowering guidance of the first roller 6 is achieved by setting a guide groove on the body 1, and the driving device is not shown. A cylinder, a screw or the like can be used as a driving method.

[0052] When the pipe 13 on the rear support 3 is long and heavy, the bent portion will be lifted up by the base 5, and the pipe 13 will be moved in cooperation with the reel 10 and the traction hook, and the bent portion will be placed on the first roller 6.

[0053] The arrangement of the first roller 6 provides stable and reliable support for the bent portion of the tube 13, effectively preventing the tube 13 from shifting, shaking, or partially deforming during the bending process, allowing the tube 13 to be processed according to the predetermined bending path and angle. This helps improve the accuracy of pipe bending, meeting the stringent bending requirements of various high-precision projects for tubes 13, reducing scrap rates, and improving production efficiency and product quality. Preferably, the position of the first roller 6 is flexibly adjustable. Accordingly, the machine body 1 should be provided with multiple fixed positions for the first roller 6, such as horizontally or vertically, to accommodate requirements for different sizes and bending angles.

[0054] In some examples, the guide platform 101 has a vertical section 103, which is located above the inclined section 102. The bent section of the pipe 13 enters the vertical section 103 after being guided by the inclined section 102. The spacing between the vertical sections 103 on both sides is adapted to the outer diameter of the pipe 13. Preferably, the distance between the vertical sections 103 on both sides should be adapted to the outer diameter of the pipe 13, so that the pipe 13 on the rear support 3 can enter between the vertical sections 103 on both sides after bending, and the pipe 13 is further supported and limited by the vertical section 103 to improve the stability of subsequent bending operations.

[0055] In some examples, another method is used to limit the pipe 13. Specifically, two rotatable second rollers 7 are correspondingly provided on the guide platforms 101 on both sides. The two second rollers 7 are located above the inclined section 102, and the interval between them is adapted to the outer diameter of the pipe 13. Compared with the vertical section 103, the rotatable second rollers 7 can improve the smoothness of the passage of the pipe 13, reduce friction, and reduce mutual wear during the bending operation, thereby improving the durability of the equipment.

[0056] In some examples, the base 5 comprises two guide wheels 12 with parallel rotation axes. The base 5 assists in conveying and lifting during the bending operation. The use of guide wheels 12 can optimize conveying efficiency, reduce surface wear on the tube 13, and reduce energy loss during operation. This reduces wear on the guide wheels 12 and tube 13, extending the equipment's service life and reducing maintenance costs. The two guide wheels 12 are preferably coaxial, providing more accurate support for the bending portion and occupying less horizontal space, thereby increasing the range of motion to accommodate various tube 13 bending requirements.

[0057] The body 1 has an inclined guide slope 104. The height of the guide slope 104 gradually decreases from away from the rear support seat 3 to close to the rear support seat 3, providing a mobile support base for the mobile frame 8. The mobile frame 8 can be driven by a cylinder. Specifically, a notch arranged along the height direction can be provided on the mobile frame 8. The cylinder drive component has a connecting head, which can be T-shaped, etc., and slides with the notch, so that the cylinder can drive the inclined path of the mobile frame 8 while keeping its position fixed.

[0058] In some examples, the guide wheel 12 is frusto-conical in shape, accommodating pipes 13 with varying diameters within a certain range. The diameters of the ends closer together are smaller than those farther apart, effectively maintaining the pipe 13 on the intended bending path during the bending process. The different diameter ends of the guide wheel 12 provide different support and guidance for the pipe 13. Through its structural characteristics, the guide wheel 12 can correct the deviation of the pipe 13 and reduce lateral displacement, thereby significantly improving guidance stability and ensuring bending accuracy.

[0059] In some examples, the top seat 4 has a first support segment 401 and a second support segment 402 arranged obliquely, and the first support segment 401 and the second support segment 402 are connected to each other in a V shape (eg Figure 2As shown, the first support section 401 is tilted toward the front support seat 2, and the second support section 402 is tilted toward the rear support seat 3. Preferably, the tilting angle should be adapted to the bending angle of the tube 13 each time. When the front support seat 2 swings and tilts, after the tube 13 is bent, the portion of the tube 13 located on the front support seat 2 is cooperatively clamped by the first support section 401 and the front support seat 2, respectively, while the portion of the tube 13 located on the rear support seat 3 is supported by the rear support seat 3. After the front support seat 2 descends, the portion of the tube 13 located on the rear support seat 3 is supported by the second support section 402. The connection between the first support section 401 and the second support section 402 is an abutment portion 403 for abutting against the tube 13. Preferably, the connection should be an arc-shaped transition.

[0060] In some examples, the horizontal movement range of the base 5 is located below the second support section 402, that is, the base 5 is raised and lowered and moved horizontally below the second support section 402, and after movement, it abuts against the part of the pipe 13 located at the abutting portion 403 close to the rear support seat 3. By pushing this part of the pipe 13, the pipe 13 located on the front support seat 2 falls toward the front support seat 2, avoiding the front and rear support seats 3 being in a tilted state, making it difficult to perform the next movement.

[0061] In some examples, the rear support 3 is raised and lowered and swung on the machine body 1. As the bending operation proceeds, the pipe 13 on the rear support 3 is bent. In order to better fit the rear support 3 with the pipe 13 and provide a more stable support, a rotation axis can be provided at the bottom of the rear support 3. The swinging of the rear support 3 can achieve better contact and fit.

[0062] In some examples, the inner tube 9 is movably arranged inside the pipe 13. The inner tube 9 has a support block 901. The support block 901 is flexible. Preferably, the support block 901 can be made of a polyurethane rubber block. The inner tube 9 can move inside the pipe 13. When the pipe 13 is bent, the inner tube 9 adjusts the support block 901 to a suitable position by moving inside the pipe 13. Since the support block 901 is flexible, it can be adaptively adjusted according to the shape of the inside of the pipe 13 and the stress changes generated during bending. During the bending process of the pipe 13, the inner wall of the pipe 13 will be subjected to uneven pressure. The flexibility of the support block 901 enables it to conform to the deformation of the inner wall of the pipe 13, fill the gap caused by bending, and evenly disperse the pressure to avoid problems such as wrinkling, thinning or cracking of the inner wall of the pipe 13 due to local stress concentration. For example, on the inner side of the bend of the pipe 13, due to the compressive stress, the inner wall of the pipe 13 may tend to sag inward, and the support block 901 can provide reverse support force in time to prevent the occurrence of sag; and on the outer side of the bend of the pipe 13, due to the tensile stress, the support block 901 can deform appropriately and extend along with the stretching of the pipe 13 to ensure the force balance between the inner and outer walls of the pipe 13.

[0063] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure and are not limiting. Although the present disclosure has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, and all of these should be included in the scope of the claims of the present disclosure.

Claims

1. A pipe bender for bending a pipe (13), characterized in that: include: A machine body (1), the machine body (1) having a guide platform (101), the guide platform (101) having an inclined section (102); A front support seat (2), the front support seat (2) is arranged on the machine body (1) in a lifting and swinging manner, and is arranged in an inclined manner after swinging. The front support seat (2) is used to support a portion on one side of the bending portion of the pipe (13); A rear support seat (3), the rear support seat (3) is arranged on the machine body (1) in a lifting manner, is located below the guide platform (101), and has a spacing space (105) between the rear support seat (3) and the front support seat (2), the rear support seat (3) is used to support the portion on the other side of the bending part of the pipe (13), the rear support seat (3) is close to the lower end of the inclined front support seat (2), and the inclined section (102) is inclined toward the rear support seat (3); A top seat (4), the top seat (4) being arranged on the machine body (1) and located above the partition space (105), and being used to support the bending portion of the pipe (13); A base (5), the base (5) is horizontally and liftably arranged on the body (1) and located in the separation space (105); the base (5) is raised or lowered above or below the front support seat (2) and the rear support seat (3); the base (5) is used to abut against the pipe (13) and push the pipe (13) upward; The base (5) is composed of two guide wheels (12) with parallel rotation axes. The machine body (1) has a guide slope (104). The guide slope (104) is arranged obliquely and is located in the spacing space (105). The height of the guide slope (104) gradually decreases from being away from the rear support seat (3) to being close to the rear support seat (3). The pipe bending machine also includes a movable frame (8). The movable frame (8) is movably arranged on the guide slope (104). The two guide wheels (12) are both rotatably arranged on the movable frame (8).

2. A pipe bending machine according to claim 1, characterized in that: The guide platform (101) has two groups, which are respectively located on both sides of the machine body (1); the pipe bending machine further includes: A first roller (6) is rotatably and liftably arranged on the machine body (1), and is located on a side of the rear support seat (3) away from the top seat (4), for supporting the pipe (13).

3. A pipe bending machine according to claim 2, characterized in that: The guide platform (101) further has a vertical section (103), and the vertical section (103) is located above the inclined section (102). The interval between the vertical sections (103) of the two groups of guide platforms (101) is adapted to the outer diameter of the pipe (13).

4. A pipe bending machine according to claim 2, characterized in that: Also includes: The second roller members (7) have at least two second roller members (7) which are rotatably arranged on the two guide platforms (101) and located above the inclined section (102). The interval between the two second roller members (7) is adapted to the outer diameter of the pipe (13).

5. The pipe bending machine according to claim 1, characterized in that: The guide wheel (12) is in a frustum shape, and the diameter of the end faces that are close to each other is smaller than the diameter of the end faces that are far away from each other.

6. The pipe bending machine according to claim 1, characterized in that: The top seat (4) has a first supporting section (401) and a second supporting section (402) arranged obliquely. The first supporting section (401) and the second supporting section (402) are connected to each other in a V shape. The connection point is an abutment portion (403). The abutment portion (403) is used to abut against the pipe (13). The first supporting section (401) is inclined toward the front supporting seat (2), and the second supporting section (402) is inclined toward the rear supporting seat (3).

7. The pipe bending machine according to claim 6, characterized in that: The horizontal movement range of the base (5) is located below the second supporting section (402).

8. The pipe bending machine according to claim 1, characterized in that: The rear support seat (3) is arranged on the machine body (1) in a manner of lifting and swinging.

9. The pipe bending machine according to claim 8, characterized in that: Also includes: An inner tube (9) is movably arranged in the tube (13), and the inner tube (9) has a support block (901). The support block (901) is flexible and is used to support the portion of the tube (13) to be bent.

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