Steel pipe straightening equipment and steel pipe straightening method

Abstract

The present invention provides a steel pipe straightening device and a steel pipe straightening method, wherein the steel pipe straightening device comprises: a base; a first roller assembly, which is arranged on the base and conveys the steel pipe; a second roller assembly, which is arranged on the base and located between the input roller and the output roller, a heating device, which can heat the bending part of the steel pipe; a first force device, which is fixedly arranged on the base, the moving direction of the first force device is perpendicular to the conveying direction of the steel pipe, the first force device comprises a first bracket and a first force mechanism movably arranged on the first bracket; the second force device is located on the side of the output roller away from the input roller, the bending part of the steel pipe is located between the output roller and the second force device, and under the joint action of the first force mechanism and the second force device, the bending part of the steel pipe can be deformed to a straight state. The technical solution of the present application effectively solves the problem of steel pipe back-cutting due to the bending of the pipe end in the related art.

Description

Technical Field

[0001] The present invention relates to the field of metal processing, and in particular to a steel pipe straightening device and a steel pipe straightening method. Background Art

[0002] Steel pipe straightening equipment can eliminate the bending and radial deformation of steel pipes during rolling, heat treatment or transportation. As the market's requirements for steel pipe strength continue to increase, high strength means high deformation resistance, making it increasingly difficult to control the straightness of steel pipes.

[0003] The full-length straightness of the steel pipe is mainly guaranteed by a multi-roll straightening machine. For steel pipes with a strength exceeding 1000MPa, warm straightening (≥580℃) is used to reduce the deformation resistance to improve the straightening effect. The local bending of the steel pipe is corrected by the three-point pressure straightening method, but the three-point pressure straightening is limited by the support distance. The closer the distance is, the greater the straightening resistance, the less obvious the straightening effect, and the greater the risk of damage to the pipe due to concave deformation of the steel pipe. The current methods for controlling the bending of the pipe end are as follows:

[0004] For a multi-roller straightening machine, when the distance between the rollers in the horizontal direction exceeds the bending length of the tube end, the tube end cannot be straightened effectively and can only be slightly corrected by using the meshing of the upper and lower roller surfaces. However, due to the lack of straightening deflection, the curvature will rebound after straightening and cannot be effectively straightened.

[0005] As for the pressure straightening machine, it is the same as the roller straightening machine, which uses the anti-bending rebound of the rolled piece to achieve the straightening purpose. The pressure straightening machine mainly uses the three-point bending principle for effective straightening. However, the three-point pressure straightening is limited by the support distance. The closer the distance is, the greater the straightening resistance is, and the less obvious the straightening effect is. At the same time, because the steel pipe is hollow, the distance at which the end of the steel pipe is in a goose-head shape is short, generally 300mm-400mm, which causes the pressure straightening machine to easily produce indentations and depressions on the steel pipe when straightening the goose-head bend at the end of the pipe, thereby damaging the pipe. In this way, the pressure straightening machine cannot effectively straighten the goose-head bend at the end of the pipe.

[0006] Therefore, neither the multi-roll straightening machine nor the pressure straightening machine mentioned above can effectively solve the goose head bend defect of the steel pipe end. Due to the lack of effective correction methods for the goose head bend at the pipe end, the steel pipe with goose head bend at the pipe end can only be cut off. For steel pipes with fixed length requirements, in order to ensure that the length after recutting meets the requirements, the pipe end recutting margin has to be reserved in advance, which not only affects the material yield, but also wastes a lot of manpower and material resources, seriously affecting production efficiency. Summary of the invention

[0007] The main purpose of the present invention is to provide a steel pipe straightening device and a steel pipe straightening method to solve the problem of steel pipe backcutting due to pipe end bending in the related art.

[0008] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a steel pipe straightening equipment, comprising: a base; a first roller assembly, which is arranged on the base and conveys the steel pipe, the first roller assembly comprising an input roller and an output roller; a second roller assembly, which is arranged on the base and located between the input roller and the output roller, the second roller assembly can support the steel pipe in the vertical direction and drive the steel pipe to rotate around the axis of the steel pipe; a heating device, which can heat the bend of the steel pipe; a first force device, which is movably arranged on the base, the moving direction of the first force device is perpendicular to the conveying direction of the steel pipe, the first force device comprises a first bracket and a first force mechanism movably arranged on the first bracket; the second force device is located on the side of the output roller away from the input roller, the bend of the steel pipe is located between the output roller and the second force device, and under the joint action of the first force mechanism and the second force device, the bend of the steel pipe can be deformed to a straight state.

[0009] Furthermore, the first force applying mechanism includes a drive cylinder assembly and a clip connected to the drive cylinder assembly, one end of the clip is hinged to the first bracket, the clip is hinged to the drive cylinder assembly, and the piston rod of the drive cylinder assembly is hinged to the first bracket.

[0010] Furthermore, the first bracket includes a first frame body and an arc-shaped plate arranged on the first frame body, and the clip is in an arc shape.

[0011] Furthermore, the base includes a frame and a foundation, the first force applying device is arranged on the frame and located above the first roller assembly, the first roller assembly and the second roller assembly are both arranged on the foundation, and the second force applying device is arranged on the frame.

[0012] Furthermore, the structure of the second force applying device is the same as that of the first force applying device.

[0013] Furthermore, the base includes a foundation and a pedestal arranged on the foundation, the first force applying device is arranged on the foundation and is located below the first roller assembly, the first roller assembly and the second roller assembly are both arranged on the foundation, and the second force applying device is arranged on the pedestal.

[0014] Furthermore, the second force-applying device includes a support and a sleeve detachably nested on the support, and the inner diameter of the sleeve is larger than the outer diameter of the steel pipe.

[0015] Furthermore, the first force applying device includes a plurality of first force applying devices which are arranged on the base at intervals, and the second roller assembly includes a second bracket movably arranged on the base and a roller assembly rotatably connected to the second bracket.

[0016] Furthermore, the steel pipe straightening equipment also includes a controller, the first force-applying device is connected to the controller, the heating device includes a third bracket and an induction coil arranged on the third bracket, the induction coil is connected to the controller, and the induction coil is removably mounted on the outside of the bend of the steel pipe.

[0017] According to another aspect of the present invention, a steel pipe straightening method is provided, comprising the following steps: conveying the bend of the steel pipe between a first force-applying device and a second force-applying device; rotating the steel pipe so that the bend of the steel pipe is bent in a horizontal direction or in a vertical direction; heating the bend of the steel pipe; fixing the steel pipe using the first force-applying device and applying force to the bend of the steel pipe using the second force-applying device, or limiting the bend of the steel pipe using the second force-applying device and applying force to the steel pipe using the first force-applying device.

[0018] According to the technical solution of the present invention, the steel pipe straightening equipment includes: a base, a first roller assembly, a second roller assembly, a heating device, a first force-applying device and a second force-applying device. The first roller assembly is arranged on the base and conveys the steel pipe, and the first roller assembly includes an input roller and an output roller. After the first roller assembly is started, the steel pipe can be translated. The second roller assembly is arranged on the base and located between the input roller and the output roller, and the second roller assembly can support the steel pipe in its vertical direction and drive the steel pipe to rotate around the axis of the steel pipe. The heating device can heat the bending part of the steel pipe to reduce the straightening deformation resistance. In this way, the bending part of the steel pipe is easy to deform under pressure, avoiding the phenomenon of depression on the surface of the steel pipe in the related art. The first force-applying device is movably arranged on the base. The moving direction of the first force-applying device is perpendicular to the conveying direction of the steel pipe. In this way, by adjusting the distance between the first force-applying device and the first roller assembly, the distance is convenient to match the size of the steel pipe placed on the first roller assembly. The first force-applying device includes a first bracket and a first force-applying mechanism movably arranged on the first bracket. The second force-applying device is located on the side of the output roller away from the input roller, and the bending part of the steel pipe is located between the output roller and the second force-applying device. Under the joint action of the first force-applying mechanism and the second force-applying device, the bending part of the steel pipe can be deformed to a straight state. The steel pipe can first be adjusted to the overall straightness of the steel pipe by a multi-roller straightener or a pressure straightener, and then the bending part of the pipe end of the steel pipe that cannot be corrected by the multi-roller straightener or the pressure straightener is transported to the position between the output roller and the second force-applying device through the first roller assembly. Under the joint action of the first force-applying mechanism and the second force-applying device, the bending part of the steel pipe can be deformed to a straight state. In this way, the technical solution of the present application can make up for the shortcomings of the multi-roller straightener and the pressure straightener in the related technology in terms of the bending and straightening ability of the pipe end, and there is no need to reserve the pipe end re-cutting margin in advance, which greatly reduces the re-cutting loss of the steel pipe and improves the yield rate of the steel pipe. Therefore, the technical solution of the present application can effectively solve the problem of steel pipe backcutting due to pipe end bending in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 It shows a front schematic diagram of the first embodiment of the steel pipe straightening device according to the present invention;

[0021] Figure 2 Shows Figure 1 A top view schematic diagram of a steel pipe straightening equipment;

[0022] Figure 3 Shows Figure 1 A cross-sectional schematic diagram of a first force applying device of a steel pipe straightening device;

[0023] Figure 4 Shows Figure 1 A partial schematic diagram of a steel pipe straightening equipment;

[0024] Figure 5 Shows Figure 1 A schematic diagram of a front view of a steel pipe straightening device in which a steel pipe is in a straightened state;

[0025] Figure 6 It shows a front schematic diagram of a second embodiment of a steel pipe straightening device according to the present invention; and

[0026] Figure 7 Shows Figure 6 Schematic diagram of top view of steel pipe straightening equipment.

[0027] The above drawings include the following reference numerals:

[0028] 1. Steel pipe; 11. Stand; 20. First roller assembly; 21. Input roller; 22. Output roller; 30. Second roller assembly; 31. Second bracket; 32. Roller assembly; 40. First force-applying device; 41. First bracket; 411. First frame; 412. Arc plate; 42. First force-applying mechanism; 421. Drive cylinder assembly; 422. Clip; 44. Pivot; 50. Heating device; 51. Third bracket; 52. Induction coil; 60. Second force-applying device; 63. Support; 64. Sleeve. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0032] like Figures 1 to 5As shown, the steel pipe straightening equipment of the first embodiment includes: a base, a first roller assembly 20, a second roller assembly 30, a heating device 50, a first force device 40 and a second force device 60. The first roller assembly 20 is arranged on the base and conveys the steel pipe 1. The first roller assembly 20 includes an input roller 21 and an output roller 22. The second roller assembly 30 is arranged on the base and is located between the input roller 21 and the output roller 22. The second roller assembly 30 can support the steel pipe along its vertical direction and drive the steel pipe 1 to rotate around the axis of the steel pipe 1. The heating device 50 can heat the bending part of the steel pipe 1. The first force device 40 is movably arranged on the base. The moving direction of the first force device 40 is perpendicular to the conveying direction of the steel pipe 1. The first force device 40 includes a first bracket 41 and a first force mechanism 42 movably arranged on the first bracket 41. The second force applying device 60 is located on the side of the output roller 22 away from the input roller 21, and the bend of the steel pipe 1 is located between the output roller 22 and the second force applying device 60. Under the joint action of the first force applying mechanism 42 and the second force applying device 60, the bend of the steel pipe 1 can be deformed to a straight state.

[0033] The technical solution of the first embodiment is applied. After the first roller assembly 20 is started, it can translate the steel pipe and adjust the position of the steel pipe 1 moving forward or backward. The second roller assembly 30 is arranged on the base and located between the input roller 21 and the output roller 22. The second roller assembly 30 can support the steel pipe along its vertical direction and drive the steel pipe 1 to rotate around the axis of the steel pipe 1. The heating device 50 can heat the bending part of the steel pipe 1. In this way, the bending part of the steel pipe 1 is easy to deform under pressure, which can greatly reduce the deformation resistance during the straightening process, improve the straightening effect, and avoid the phenomenon of depression on the surface of the steel pipe in the related art. The first force-applying device 40 is movably arranged on the base. The moving direction of the first force-applying device 40 is perpendicular to the conveying direction of the steel pipe 1. In this way, by adjusting the distance between the first force-applying device 40 and the first roller assembly 20, the distance is convenient to match the size of the steel pipe placed on the first roller assembly 20. The first force-applying device 40 includes a first bracket 41 and a first force-applying mechanism 42 movably disposed on the first bracket 41. The second force-applying device 60 is located on the side of the output roller 22 away from the input roller 21, and the bend of the steel pipe 1 is located between the output roller 22 and the second force-applying device 60. Under the joint action of the first force-applying mechanism 42 and the second force-applying device 60, the bend of the steel pipe 1 can be deformed to a straightened state. The steel pipe 1 can first be adjusted for its overall straightness by a multi-roll straightening machine or a pressure straightening machine, and then the bend of the pipe end of the steel pipe 1 that cannot be corrected by the multi-roll straightening machine or the pressure straightening machine is transported to the position between the output roller and the second force-applying device through the first roller assembly 20. Under the joint action of the first force-applying mechanism and the second force-applying device, the bend of the steel pipe can be deformed to a straightened state. In this way, the technical solution of the first embodiment can make up for the shortcomings of the multi-roll straightening machine and the pressure straightening machine in the related art in terms of the bending and straightening capabilities of the pipe ends, and there is no need to reserve the pipe end re-cutting margin in advance, which greatly reduces the steel pipe re-cutting loss and improves the steel pipe yield rate. Therefore, the technical solution of the first embodiment can effectively solve the problem of re-cutting of steel pipes due to pipe end bending in the related art.

[0034] It should be noted that the back-cutting margin in this embodiment means that, assuming that a 10m long steel pipe needs to be cut, the length of the steel pipe before straightening is greater than 10m. After straightening, the portion of the pipe end with an extra 10m length at the bend is cut off, and the cut portion is the back-cutting margin. The bend of the steel pipe in Embodiment 1 is located at the end of the steel pipe, and the rotation axis of the first roller assembly 20 in Embodiment 1 is perpendicular to the rotation axis of the second roller assembly 30.

[0035] like Figure 3As shown, in the first embodiment, the first force-applying mechanism 42 includes a drive cylinder assembly 421 and a clip 422 connected to the drive cylinder assembly 421. The structure of the clip 422 is simple, and it is convenient to cooperate with the first bracket 41 to clamp the steel pipe 1. One end of the clip 422 is hinged to the first bracket 41, the clip 422 is hinged to the drive cylinder assembly 421, and the piston rod of the drive cylinder assembly 421 is hinged to the first bracket 41. Under the movement of the piston rod, the clip 422 is driven to swing around the first bracket 41 to adjust the opening size of the clip 422, and adjust it according to the outer diameter size of the steel pipe 1 to ensure that the steel pipe 1 can be completely clamped. In this way, the opening size of the clip 422 is adjusted according to the different outer diameters of the steel pipe to open and close, avoiding frequent replacement of the pressure head in the related technology, and greatly improving the work efficiency.

[0036] The driving cylinder of the driving cylinder assembly in the first embodiment may be an oil cylinder or a gas cylinder.

[0037] like Figure 3 As shown, in the first embodiment, the first bracket 41 includes a first frame body 411 and an arc-shaped plate 412 arranged on the first frame body 411. The clip 422 is arc-shaped. The shapes of the arc-shaped plate 412 and the clip 422 are similar to the wall profile of the steel pipe 1, so that the contact area between the arc-shaped plate 412 and the wall of the steel pipe 1 can be guaranteed, and at the same time, the contact area between the clip 422 and the wall of the steel pipe 1 can also be guaranteed, so that the clamping and fixing effect of the first force-applying mechanism 42 is better and more stable. The first bracket 41 also includes a first cylinder assembly for driving the first frame body 411 to move. The first cylinder assembly includes a cylinder and a piston rod movably arranged in the cylinder. The cylinder is hinged to the stand 11, and the piston rod is hinged to the first bracket 41.

[0038] like Figure 3 As shown, in the first embodiment, the clip 422 includes two clips located on both sides of the arc plate 412, and the opening size between the two clips 422 can be adjusted, and can be flexibly adjusted according to the outer diameter of the steel pipe 1, so that the clip 422 can reliably clamp the steel pipe 1. The clip 422 is connected to the arc plate 412 through a pivot 44.

[0039] like Figure 1As shown, in the first embodiment, the base includes a stand 11 and a foundation. The first force-applying device 40 is arranged on the stand 11 and is located above the first roller assembly 20. The setting of the stand 11 facilitates fixing the first force-applying device 40 above the steel pipe 1. The oil cylinder of the first oil cylinder assembly is connected to the stand 11. The first roller assembly 20 and the second roller assembly 30 are both arranged on the foundation, and the second force-applying device 60 is arranged on the stand 11. The setting of the stand 11 facilitates fixing the second force-applying device 60 above the steel pipe 1. In the first embodiment, the first force-applying device 40 and the second force-applying device 60 are both located above the steel pipe 1, so that when the pipe end of the steel pipe 1 is bent upward, the first force-applying device 40 can press the steel pipe 1 on the first roller assembly 20, so that the clamping piece of the second force-applying device 60 can apply force to the pipe end of the steel pipe 1 from top to bottom. In the process of applying force, the appropriate stroke and supporting force are selected according to the severity of the bending of the pipe end of the steel pipe 1. Specifically, the steel pipe straightening equipment also includes a detection device arranged at the bend of the pipe end of the steel pipe 1 and a controller connected to the detection device, and the second force-applying device 60 is connected to the controller. The above-mentioned "appropriate stroke and supporting force" are controlled by the controller to realize stepless adjustment of the upward stroke. The "severity of the pipe end bend" includes the length and curvature of the pipe end bend. The above-mentioned severity can be judged by manual judgment or by automatic infrared measurement. Figure 1 As shown, in the first embodiment, the structure of the second force applying device 60 is the same as that of the first force applying device 40. In this way, it is easy to assemble and improve production efficiency. Specifically, the second force applying mechanism includes a drive cylinder assembly and a second clip connected to the drive cylinder assembly, one end of the second clip is hinged to the fourth bracket, the second clip is hinged to the drive cylinder assembly, and the piston rod of the drive cylinder assembly is hinged to the fourth bracket. The fourth bracket includes a second frame body and a second arc plate arranged on the second frame body, and the second clip is arc-shaped.

[0040] like Figure 1 and Figure 2 As shown, in the first embodiment, the first force applying device 40 includes five first force applying devices 40, and the five first force applying devices 40 are arranged on the base at intervals. The five first force applying devices can apply force to the steel pipe 1 respectively, and the fixing of the steel pipe 1 is more reliable. Of course, in other embodiments not shown in the figures, the number of the first force applying devices is not limited to five, and can be two, three, four, six or more. The specific design number can be adjusted according to the actual applicable steel pipe length.

[0041] like Figure 4As shown, in the first embodiment, the second roller assembly 30 includes a second bracket 31 movably arranged on the base and a roller assembly 32 rotatably connected to the second bracket 31. The roller assembly 32 has a simple structure and is easy to install and process. The roller assembly 32 includes two rollers. Of course, the design number of rollers can be adjusted according to the actual applicable steel pipe length. At the same time, the distance between the two rollers driving the two rollers to rotate is adjustable to adapt to steel pipes with different outer diameters. The second roller assembly 30 also includes a second cylinder assembly (not shown in the figure) that drives the second bracket 31 to move. The second cylinder assembly includes a cylinder and a piston rod movably arranged in the cylinder. The piston rod is hinged to the roller assembly 32, and the cylinder is hinged to the foundation.

[0042] like Figures 1 to 4 As shown, in the first embodiment, the steel pipe straightening equipment also includes a controller, the first force-applying device 40 is connected to the controller, the heating device 50 includes a third bracket 51 and an induction coil 52 arranged on the third bracket 51, the induction coil 52 is connected to the controller, and the induction coil 52 is removably sleeved on the outside of the bend of the steel pipe 1. The induction coil 52 has a simple structure and low cost, and heats the bend of the steel pipe 1 more evenly. Before straightening, the induction coil 52 is sleeved on the bend of the steel pipe 1 to heat the bend of the steel pipe 1, and after the heating is completed, the induction coil 52 is removed from the bend of the steel pipe 1. The induction coil 52 of this embodiment is preferably a medium frequency induction coil. In other embodiments not shown in the figures, the heating device can also use an oxygen gun according to the actual conditions of the factory.

[0043] like Figures 1 to 5 As shown, in Example 1, the specific working process of the steel pipe straightening equipment is as follows:

[0044] Through the first roller assembly 20 → locate the position of the bend of the pipe end of the steel pipe 1 → raise the second roller assembly 30 to exceed the first roller assembly 20 → drive the steel pipe 1 to rotate circumferentially until the bending direction of the pipe end of the steel pipe 1 is upward → move the induction coil 52 to the bending part of the pipe end and heat it → withdraw the induction coil 52 → the first force-applying device 40 moves downward and fixes the pipe body of the steel pipe 1 → drive the first bracket 41 of the second force-applying device 60 to apply force downward until the bending of the pipe end of the steel pipe 1 is eliminated to a straight state. In this way, the technical solution of the embodiment 1 of the steel pipe straightening equipment not only ensures that the defects of the bend of the pipe end of the steel pipe are effectively solved and the straightness requirements of the pipe end of the steel pipe are met, but also ensures that the surface of the steel pipe is not damaged during the straightening process.

[0045] like Figure 6 and Figure 7As shown, in the second embodiment of the steel pipe straightening equipment provided by the present application, the difference from the first embodiment is that the base includes a foundation and a pedestal arranged on the foundation, and the first force-applying device 40 is arranged on the foundation and located below the first roller assembly 20, so that the setting of the pedestal facilitates the first force-applying device 40 to be fixed below the steel pipe 1. The first roller assembly 20 and the second roller assembly 30 are both arranged on the foundation, and the second force-applying device 60 is arranged on the pedestal. In this way, the setting of the pedestal facilitates the second force-applying device 60 to be fixed below the steel pipe 1. In the second embodiment, the first force-applying device 40 and the second force-applying device 60 are both located below the steel pipe 1, so that when the pipe end of the steel pipe 1 is bent downward, the first force-applying device 40 can support the steel pipe 1 on the one hand, so that the second force-applying device 60 can apply force to the steel pipe 1 from bottom to top. In the process of applying force, the appropriate stroke and supporting force are selected according to the severity of the bending of the pipe end of the steel pipe 1. Specifically, the steel pipe straightening device also includes a detection device arranged at the bend of the pipe end of the steel pipe 1 and a controller connected to the detection device, and the first force applying device 40 is connected to the controller. The above-mentioned "appropriate stroke and supporting force" are controlled by the controller to realize stepless adjustment of the upward stroke. The "severity of the pipe end bend" includes the length and curvature of the pipe end bend, and the above-mentioned severity can be judged manually or automatically measured by infrared.

[0046] It should be noted that the structure of the first force applying device 40 of the second embodiment is the same as that of the first force applying device 40 of the first embodiment. In this way, the cooperation between the clip 422 and the first bracket 41 can provide a supporting force on the one hand, and on the other hand, the opening size of the clip 422 can be adjusted to open and close according to the different outer diameters of the steel pipe, thereby avoiding frequent replacement of the pressure head in the related art and greatly improving the work efficiency.

[0047] like Figure 6 and Figure 7 As shown, in the second embodiment, the second force-applying device 60 includes a support 63 and a sleeve 64 detachably nested on the support 63, and the inner diameter of the sleeve 64 is larger than the outer diameter of the steel pipe 1. In this way, the sleeve 64 can be sleeved on the outer side of the bend of the pipe end of the steel pipe 1 to limit the position. When the first force-applying device 40 applies force upward to the steel pipe 1, the pipe end of the steel pipe 1 remains stationary, and the pipe body of the steel pipe 1 moves upward as a whole. It should be noted that the sleeve 64 is preferably a high-hardness steel sleeve. The size of the inner diameter of the sleeve 64 can be replaced according to the outer diameter size of the correction steel pipe 1.

[0048] like Figure 6 As shown, in the second embodiment, the specific working process of the steel pipe straightening equipment is as follows:

[0049] Through the first roller assembly 20 → locate the position of the bending part of the pipe end of the steel pipe 1 → raise the second roller assembly 30 to exceed the first roller assembly 20 → drive the steel pipe 1 to rotate in the circumferential direction until the bending direction of the pipe end of the steel pipe 1 is downward → move the induction coil 52 to the bending part of the pipe end and heat it → withdraw the induction coil 52 → operate the first roller assembly 20 to make the steel pipe 1 enter the sleeve 64, and adjust the position of the straightening point → close the clamp 422 in the first force-applying device 40, and determine the lifting height of the clamp 422 according to the bending degree of the pipe end of the steel pipe 1 → after fine-tuning → the first bracket 41 of the first force-applying device 40 applies force upward until the bending of the pipe end of the steel pipe 1 is eliminated to a straightened state. In this way, the technical solution of the second embodiment of the steel pipe straightening equipment not only ensures that the defects of the bending part of the pipe end of the steel pipe are effectively solved and the straightness requirements of the pipe end of the steel pipe are met, but also ensures that the surface of the steel pipe is not damaged during the straightening process.

[0050] The present application also provides a steel pipe straightening method, such as Figure 1 and Figure 6 As shown, in this embodiment, the steel pipe straightening method includes the following steps: conveying the bend of the steel pipe 1 to between the first force-applying device 40 and the second force-applying device 60; rotating the steel pipe 1 so that the bend of the steel pipe 1 is bent in the horizontal direction or in the vertical direction; heating the bend of the steel pipe 1; fixing the steel pipe 1 with the first force-applying device 40, applying force to the bend of the steel pipe 1 with the second force-applying device 60, or limiting the bend of the steel pipe 1 with the second force-applying device 60, and applying force to the steel pipe 1 with the first force-applying device 40. The technical solution of the steel pipe straightening method of this embodiment can effectively solve the problem of steel pipe back-cutting caused by the bending of the pipe end in the related art. It should be noted that the bending of the steel pipe 1 in the horizontal direction means that the axis of the steel pipe 1 is located in the horizontal plane at the bend. The bending of the steel pipe 1 in the vertical direction means that the axis of the steel pipe 1 is located in the vertical plane at the bend.

[0051] In the present application, the pipe end of the steel pipe can also be bent to the left, and accordingly, the first force-applying device and the second force-applying device are simultaneously located on the right side of the steel pipe. The pipe end of the steel pipe can also be bent to the right, and accordingly, the first force-applying device and the second force-applying device are simultaneously located on the left side of the steel pipe. Of course, in other embodiments not shown in the figures, a first force-applying device and a second force-applying device are provided in four directions of the bend of the pipe end of the steel pipe. In this way, the curvature of the existing bend of the steel pipe can be adjusted at the same time. In addition, after the related art adjusts the straightness of the steel (such as bars, channel steels, etc.) through the transport roller and the pressure head structure, the steel pipe straightening equipment of the present application can also be used to straighten the bend at the end of the steel (such as bars, channel steels, etc.).

[0052] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0053] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0054] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A steel pipe straightening device, characterized in that: include: matrix; A first roller assembly (20), arranged on the base and conveying the steel pipe (1), the first roller assembly (20) comprising an input roller (21) and an output roller (22); a second roller assembly (30) arranged on the base and located between the input roller (21) and the output roller (22), the second roller assembly (30) being capable of supporting and driving the steel pipe (1) to rotate around the axis of the steel pipe (1) in its vertical direction; A heating device (50) capable of heating the bend of the steel pipe (1); a first force applying device (40) movably arranged on the base, the moving direction of the first force applying device (40) being perpendicular to the conveying direction of the steel pipe (1), the first force applying device (40) comprising a first bracket (41) and a first force applying mechanism (42) movably arranged on the first bracket (41), the first force applying device (40) comprising a plurality of; a second force applying device (60) located on a side of the output roller (22) away from the input roller (21), the curved portion of the steel tube (1) being located between the output roller (22) and the second force applying device (60), and under the combined action of the first force applying mechanism (42) and the second force applying device (60), the curved portion of the steel tube (1) can be deformed to a straightened state; The base comprises a foundation and a pedestal arranged on the foundation, the first force applying device (40) is arranged on the foundation and is located below the first roller assembly (20), the first roller assembly (20) and the second roller assembly (30) are both arranged on the foundation, and the second force applying device (60) is arranged on the pedestal; The second force applying device (60) comprises a support (63) and a sleeve (64) detachably nested on the support (63), wherein the inner diameter of the sleeve (64) is greater than the outer diameter of the steel pipe (1).

2. The steel pipe straightening equipment according to claim 1, characterized in that: The first force applying mechanism (42) comprises a drive cylinder assembly (421) and a clip (422) connected to the drive cylinder assembly (421), one end of the clip (422) being hinged to the first bracket (41), the clip (422) being hinged to the drive cylinder assembly (421), and a piston rod of the drive cylinder assembly (421) being hinged to the first bracket (41).

3. The steel pipe straightening equipment according to claim 2, characterized in that: The first bracket (41) comprises a first frame body (411) and an arc-shaped plate (412) arranged on the first frame body (411), and the clip (422) is in an arc shape.

4. The steel pipe straightening equipment according to claim 1, characterized in that: The base comprises a frame (11) and a foundation, the first force applying device (40) is arranged on the frame (11) and is located above the first roller assembly (20), the first roller assembly (20) and the second roller assembly (30) are both arranged on the foundation, and the second force applying device (60) is arranged on the frame (11).

5. The steel pipe straightening equipment according to claim 1, characterized in that: A plurality of the first force applying devices (40) are arranged at intervals on the base, and the second roller assembly (30) comprises a second bracket (31) movably arranged on the base and a roller assembly (32) rotatably connected to the second bracket (31).

6. The steel pipe straightening equipment according to claim 1, characterized in that: The steel pipe straightening device further comprises a controller, the first force applying device (40) being connected to the controller, the heating device (50) comprising a third bracket (51) and an induction coil (52) arranged on the third bracket (51), the induction coil (52) being connected to the controller, and the induction coil (52) being removably sleeved on the outer side of the bend of the steel pipe (1).

7. A steel pipe straightening method, characterized in that: The steel pipe straightening method realizes the straightening of the steel pipe by the steel pipe straightening equipment described in any one of claims 1 to 6, and the steel pipe straightening method comprises the following steps: Conveying the curved portion of the steel pipe (1) to between the first force applying device (40) and the second force applying device (60); Rotating the steel pipe (1) so that the bending portion of the steel pipe (1) bends in a horizontal direction or in a vertical direction; Heating the bend of the steel pipe (1); The second force applying device (60) is used to limit the bending portion of the steel pipe (1), and the first force applying device (40) is used to apply force to the steel pipe (1).

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