A straightening device for thin-wall seamless steel pipes

Abstract

This invention provides a straightening device for thin-walled seamless steel pipes; it includes a workbench, a straightening assembly, and a drive unit; the straightening assembly includes one or more of a plurality of first straightening sections arranged on the outside of the steel pipe or a plurality of second straightening sections arranged on the inside of the steel pipe; the drive unit is respectively connected to the first straightening sections and the second straightening sections to drive the first straightening sections and the second straightening sections to move radially along the steel pipe on the workbench; this invention, by arranging the first straightening sections and the second straightening sections in corresponding areas on the inside and outside of the steel pipe, restricts the force applied to the steel pipe during the straightening process to be between the first straightening sections and the second straightening sections, thereby improving the straightening effect of the thin-walled seamless steel pipe. Compared with the operation of applying pressure to the outside of the steel pipe, it effectively reduces the additional stress generated on the surface of the steel pipe adjacent to the straightening part, and avoids the problem of local deformation during the straightening process of thin-walled seamless steel pipes.

Description

Technical Field

[0001] The invention relates to the technical field of steel pipe processing, in particular to a straightening device for thin-wall seamless steel pipes. Background Art

[0002] After rolling or heat treatment, steel pipes will inevitably bend and deform due to external forces, thermal stress or structural stress. For the bending deformation of steel pipe ends and large-diameter steel pipes, pressure straightening methods are often used. Traditional pressure straightening often relies on experience to determine process parameters, resulting in poor straightening accuracy. The automatic straightening equipment that has appeared has improved its straightening accuracy, but for thin-walled seamless steel pipes, the low strength of the steel pipes themselves means that the pressure straightening method is still not perfect.

[0003] Chinese patent application number CN202110536287.X discloses an online straightening device for steel pipe expansion. This solution uses multiple bending detectors to comprehensively detect the formation of the steel pipe, so that the clamping structure on the annular frame rotates to the bending direction of the steel pipe, forming a targeted straightening operation, improving the accuracy and efficiency of the straightening, and can form real-time straightening operations when the steel pipe expands to form bends in different directions, thereby improving the straightening effect of the steel pipe.

[0004] However, in this technical solution, the steel pipe is straightened by applying pressure to a local position. For thin-walled seamless steel pipes, stress deformation is more likely to occur at a local position during the pressurized straightening process. Therefore, a smaller pressurized stress value is used, which weakens the straightening efficiency of the steel pipe, thereby affecting the overall straightening effect of the thin-walled steel pipe. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies in the prior art and to provide a straightening device for thin-walled seamless steel pipes. By arranging a first straightening portion and a second straightening portion in corresponding areas on both sides of the steel pipe, the force applied to the steel pipe during the straightening process is limited between the first straightening portion and the second straightening portion, thereby improving the straightening effect of the thin-walled seamless steel pipe. Compared with the pressurized straightening operation on the outside of the steel pipe, the additional stress on the surface of the steel pipe adjacent to the straightening portion is effectively reduced, thereby avoiding the problem of local deformation during the straightening process of the thin-walled seamless steel pipe.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A straightening device for thin-wall seamless steel pipes, comprising a workbench and:

[0008] A straightening assembly, wherein the straightening assembly is movably disposed on a workbench, and the straightening assembly includes one or more of a plurality of first straightening parts arranged on the outside of the steel pipe or a plurality of second straightening parts arranged on the inside of the steel pipe; and

[0009] A driving part, wherein a plurality of driving parts are fixedly arranged on one side of the straightening assembly and are respectively connected to the first straightening part and the second straightening part by transmission, and the driving part enables the first straightening part and the second straightening part to move along the radial direction of the steel pipe on the workbench;

[0010] The first straightening portion and the second straightening portion have the same structure, including:

[0011] A rotating member, the rotating member having an annular structure is fixedly mounted on the workbench; and

[0012] A transmission member, wherein the transmission member is movably arranged in the radial direction of the rotating member, and both ends of the transmission member are arranged through the inner and outer sides of the rotating member, and a pressing block for straightening is fixedly arranged at one end of the transmission member facing the steel pipe, and the other end of the transmission member is transmission-connected to the driving part;

[0013] The difference between the first straightening part and the second straightening part is that the driving parts move in opposite directions during the straightening process.

[0014] The steel pipe to be straightened is clamped in the straightening assembly on the workbench, and the first straightening part and the second straightening part are respectively located at corresponding positions on both sides of the inner and outer walls of the steel pipe. Then the pressure block on the transmission part is driven by the driving part to move toward the steel pipe and extrude and straighten it.

[0015] Furthermore, the pressing block is an arc-shaped plate-shaped structure, and the transmission member also includes a transmission accessory for adjusting the shape of the pressing block, the two ends of the transmission accessory are respectively connected to the pressing block and the driving part, and the paired transmission accessories are distributed on both sides of the transmission member along the circumference of the rotating member;

[0016] In the process of moving the pressing block to the surface of the steel pipe for pressurization, the transmission parts and transmission accessories have different feed amounts, so that the plate-shaped pressing block forms an arc structure with different curvatures.

[0017] Furthermore, the pressing block is fixedly provided with sliding blocks at both ends along the circumference of the rotating member, and the sliding blocks are provided with sliding grooves for movably connecting to the transmission accessories.

[0018] As a preference, it further includes a roller portion for rolling and pressurizing the clamped steel pipe, wherein the roller portion is movably arranged on the side of the pressure block facing the steel pipe, the roller portion protrudes from the surface of the pressure block and the axial direction of the roller portion is parallel to the axial direction of the clamped steel pipe.

[0019] Specifically, it also includes a traction part for guiding the movement of the transmission member and the transmission accessory, and the traction part includes:

[0020] A rotating disk, the rotating disk is movably arranged on the end surface of the rotating member, and the rotating disk and the rotating member are arranged coaxially;

[0021] A guide groove, the guide groove being provided on the surface of the rotary disk and being inclined to the radial direction of the rotary member;

[0022] A driven member, which is fixedly mounted on the transmission member and the transmission accessory and is away from the pressing block end and is movably connected in the guide groove; and

[0023] The transmission part is connected to the driving part in a transmission manner and is fixed on a side of the rotating member facing the driving part.

[0024] Furthermore, the length of the guide groove in the radial direction of the turntable is equal to the moving distance of the transmission member in the radial direction of the turntable, and the arc angle of the guide groove in the circumferential direction of the turntable is equal to the arc angle of the transmission member in the circumferential direction of the turntable.

[0025] As a preference, the turntables are arranged in pairs at both end surfaces of the rotating member, the pair of turntables are respectively connected to the transmission member and the transmission accessory through driven members, and the pair of turntables rotate differentially under the action of the driving part of the transmission connection.

[0026] Furthermore, it also includes a support part for clamping the steel pipe, and the support part includes:

[0027] Support frames are arranged in pairs at both ends of the steel pipe and are movably mounted on a workbench; and

[0028] The shaft rod member is movably connected between the paired support frames, and the second straightening portion is movably connected to the shaft rod member.

[0029] Furthermore, the shaft member includes a first shaft section for fixing the rotating member and a second shaft section for fixing the rotating disk, the second shaft section is sleeved on the first shaft section, and the second shaft sections located on both sides of the end surface of the second straightening portion are respectively connected to the driving portion.

[0030] As a preferred embodiment, the device further comprises a clamping part for mounting the rotating member, wherein the clamping part enables a plurality of second straightening parts to be mounted on the shaft member, and the clamping part comprises:

[0031] A through groove, wherein the through groove is formed on the second shaft section and exposes the first shaft section;

[0032] A keyway, the keyway corresponding to the position of the through slot is provided on the first shaft segment; and

[0033] A curved key movably connected to the rotating member is used to engage with the keyway.

[0034] (1) The present invention utilizes a first straightening portion and a second straightening portion arranged in corresponding areas on both sides of the steel pipe, so that the force applied to the steel pipe during the straightening process is limited between the first straightening portion and the second straightening portion. Compared with the operation of pressurizing and straightening on the outside of the steel pipe, the present invention effectively reduces the additional stress on the surface of the steel pipe adjacent to the straightening portion, avoids local deformation during the straightening process of the thin-walled seamless steel pipe, and thus improves the straightening effect of the thin-walled seamless steel pipe.

[0035] (2) The present invention controls the deformation amount of the curvature of the cambered surface of the pressing block by setting the feed difference between the transmission member and the transmission accessory, thereby adapting to the pressurized straightening process of steel pipes of different models and improving the straightening efficiency of various steel pipes.

[0036] (3) The present invention realizes the effect of rolling pressurization by rotating the roller part installed on the pressing block so that the clamped steel pipe rotates relative to the roller part. The process of straightening the steel pipe is often under static pressure. In the process of straightening different parts of the steel pipe, it is necessary to perform unloading and then pressurizing operations. Due to the existence of residual stress during processing, the pressurizing process needs to be repeated many times. The convenience of the steel pipe straightening process is also improved.

[0037] (4) The present invention can realize the feeding action of multiple transmission members and pressure blocks in the circumferential direction of the steel pipe by adopting a single driving part, so that the driven part drives the transmission member to move along the radial direction of the rotating part, realizes the movement of the pressure block relative to the steel pipe and plays a role in pressurization and straightening. The driving part adopts, for example, a servo motor, and the transmission part adopts gears respectively fixed on the main shaft of the servo motor and an arc-shaped rack on the circumference of the turntable. The transmission accuracy and transmission efficiency are also increased through the gear transmission, thereby further improving the pressurization and straightening quality of the steel pipe by the pressure block.

[0038] (5) The present invention utilizes the through groove on the second shaft segment and the keyway at the corresponding position on the first shaft segment, operates the locking screw to tighten the unfolded crank key into the keyway of the first shaft segment to complete the installation, then installs the turntable on the second shaft segment and assembles it into a second straightening section. By installing multiple second straightening sections in the shaft member, it is suitable for pressurized straightening of longer steel pipes, thereby enhancing the stability of clamping the long steel pipes and improving the pressurized straightening effect of thin-walled seamless steel pipes.

[0039] In summary, the present invention has the advantages of changing the diameter of the straightening mechanism and correspondingly adjusting the curvature of the pressing block to adapt to the straightening of steel pipes of different specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0041] Figure 2 This is a schematic diagram of the structure of the straightening assembly of the present invention;

[0042] Figure 3 This is a schematic diagram of the operating state of the straightening assembly of the present invention;

[0043] Figure 4 This is an exploded schematic diagram of the first straightening part structure of the present invention;

[0044] Figure 5 This is an exploded schematic diagram of the second straightening part structure of the present invention;

[0045] Figure 6 It is a schematic diagram of the structure of the engaging portion of the present invention;

[0046] Figure 7 for Figure 2 A local enlarged schematic diagram of the middle A;

[0047] Figure 8 for Figure 6 A local enlarged schematic diagram of point B in the middle. DETAILED DESCRIPTION

[0048] 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 embodiment is only an embodiment of an apparatus of the present invention, rather than all embodiments. 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.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0050] Embodiment 1

[0051] like Figure 1-5 As shown, this embodiment provides a straightening device for thin-walled seamless steel pipes, including a workbench 1, and also including:

[0052] A straightening assembly 2, wherein the straightening assembly 2 is movably disposed on the workbench 1, and the straightening assembly 2 includes one or more of a plurality of first straightening parts 21 arranged on the outside of the steel pipe or a plurality of second straightening parts 22 arranged on the inside of the steel pipe; and

[0053] A driving part 23, a plurality of driving parts 23 fixedly arranged on one side of the straightening assembly 2, are respectively connected to the first straightening part 21 and the second straightening part 22 by transmission, and the driving part 23 enables the first straightening part 21 and the second straightening part 22 to move along the radial direction of the steel pipe on the workbench 1;

[0054] The first straightening portion 21 and the second straightening portion 22 have the same structure, including:

[0055] A rotating member 240, the rotating member 240 having an annular structure is fixedly mounted on the workbench 1; and

[0056] A transmission member 241, wherein the transmission member 241 is movably arranged in the radial direction of the rotating member 240, and both ends of the transmission member 241 are arranged to penetrate the inner and outer sides of the rotating member 240, and a pressing block 242 for straightening is fixedly arranged at one end of the transmission member 241 facing the steel pipe, and the other end of the transmission member 241 is transmission-connected to the driving part 23;

[0057] The difference between the first straightening portion 21 and the second straightening portion 22 is that the driving member 241 moves in opposite directions during the straightening process.

[0058] The steel pipe to be straightened is clamped in the straightening assembly 2 on the workbench 1, and the first straightening part 21 and the second straightening part 22 are respectively located at corresponding positions on both sides of the inner and outer walls of the steel pipe. Then, the pressing block 242 on the transmission member 241 is driven by the driving part 23 to move toward the steel pipe for extrusion and straightening.

[0059] In this embodiment, the steel pipe is clamped into the straightening assembly 2 on the workbench 1, so that the steel pipe and the first straightening part 21 and the second straightening part 22 are in a coaxial state, and then the driving part 23, such as a cylinder, pulls the transmission member 241, such as a connecting rod, to move radially along the disc of the rotating member 240, so that the pressure block 242 fixed on the end of the transmission member 241 abuts against the steel pipe, and as the force of the cylinder of the driving part 23 is gradually increased, the pressure blocks 242 abutting against the inner and outer sides of the steel pipe pressurize the pipe wall, and the plurality of transmission members 241 arranged around the rotating member 240 and the pressure blocks 242 thereon cooperate with each other to play a straightening role. After the straightening is completed, the pressure of the cylinder of the driving part 23 is removed, the pressure blocks 242 of the first straightening part 21 and the second straightening part 22 are separated, and the position of the steel pipe in the straightening assembly 2 is adjusted, and then the pressurization straightening process is continued, and this reciprocating operation is performed to achieve the straightening operation of the entire steel pipe;

[0060] In the present embodiment, the first straightening portion 21 and the second straightening portion 22 arranged in corresponding areas on both sides of the steel pipe are used so that the force applied to the steel pipe during the straightening process is limited between the first straightening portion 21 and the second straightening portion 22. Compared with the pressurized straightening operation on the outside of the steel pipe, the additional stress on the surface of the steel pipe adjacent to the straightening position is effectively reduced, thereby avoiding local deformation during the straightening process of the thin-walled seamless steel pipe, thereby improving the straightening effect of the thin-walled seamless steel pipe.

[0061] like Figure 3 As shown, the pressing block 242 is an arc-shaped plate-shaped structure, and the transmission member 241 also includes a transmission accessory 2410 for adjusting the shape of the pressing block 242. The two ends of the transmission accessory 2410 are respectively connected to the pressing block 242 and the driving part 23, and the paired transmission accessories 2410 are distributed on both sides of the transmission member 241 along the circumference of the rotating member 240;

[0062] In the process of moving the pressing block 242 to the surface of the steel pipe for pressurization, the transmission member 241 and the transmission accessory 2410 have different feed amounts, so that the plate-shaped pressing block 242 forms an arc structure with different curvatures.

[0063] In the present embodiment, a pressure block 242 made of a deformable material, such as a copper plate, and a transmission accessory 2410, such as a support rod, fixedly connected to the pressure block 242, in cooperation with the connecting rod of the transmission member 241, are fed to the steel pipe at different distances under the action of the cylinders of different driving parts 23, so that the pressure block 242 connected to its end presents an arc shape with different degrees of bending, and the softer hardness of the copper plate of the pressure block 242 is utilized to avoid wear on the wall of the thin-walled seamless steel pipe during the pressurized straightening process. Subsequently, in the process of straightening the steel pipe, when thin-walled seamless steel pipes of different models and sizes are involved, the pressure block 242 with the same arc-shaped plate structure is directly used. By setting the feed amount difference between the transmission member 241 and the transmission accessory 2410, the deformation amount of the arc curvature of the pressure block 242 is controlled, thereby adapting to the pressurized straightening process of steel pipes of different models, thereby improving the straightening efficiency of various steel pipes.

[0064] like Figure 3 As shown, the pressing block 242 is fixedly provided with sliding blocks 2420 at both ends along the circumference of the rotating member 240 , and the sliding blocks 2420 are provided with sliding grooves 2421 for movably connecting to the transmission accessory 2410 .

[0065] In this embodiment, when the transmission accessory 2410 and the transmission member 241 move radially along the rotating member 240, the slide groove 2421 provided on the pressure block 242 allows the transmission accessory 2410 to move synchronously on the slide groove 2421 of the sliders 2420 at both ends of the pressure block 242 when feeding radially along the rotating member 240, thereby avoiding extrusion in the circumferential direction of the pressure block 242, and utilizing the end face of the slide table to enable the slidingly connected transmission accessory 2410 to move in a single direction at the end of the pressure block 242, thereby preventing the transmission accessory 2410 from generating additional radial displacement when moving along the surface of the pressure block 242 with an arc structure, thereby avoiding interference with the feed amount of the pressure block 242 supported by the transmission accessory 2410, thereby enhancing the control accuracy of the deformation curvature of the pressure block 242, thereby improving the straightening quality of the thin-walled seamless steel pipe.

[0066] like Figure 3-5 As shown, it also includes a roller portion 2422 for rolling and pressurizing the clamped steel pipe. The roller portion 2422 is movably arranged on the side of the pressure block 242 facing the steel pipe. The roller portion 2422 protrudes from the surface of the pressure block 242 and the axial direction of the roller portion 2422 is parallel to the axial direction of the clamped steel pipe.

[0067] For a steel pipe with a small straightness error, the rotating roller part 2422 is made to contact the surface of the steel pipe, and through the joint action of the first straightening part 21 and the pressure block 242 in the second straightening part 22, the rolling roller part 2422 applies stress along the inner and outer walls of the steel pipe respectively, thereby making the first straightening part 21 and the second straightening part 22 rotate together along the pipe wall of the steel pipe, directly pressurizing and straightening the entire wall surface of the steel pipe;

[0068] For a steel pipe with a large straightness error, the pressing block 242 in the first straightening part 21 can be directly pressed against the steel pipe, and the first straightening part 21 can be driven to rotate by the rotary motor on the support part 4, thereby changing the position of the steel pipe relative to the second straightening part 22, and then the pressing block 242 on the second straightening part 22 is controlled to move to support and clamp the steel pipe, and then the pressure of the first straightening part 21 on the steel pipe is released and rotated to a position corresponding to the second straightening part 22, thereby completing the adjustment of the straightening area of ​​the steel pipe;

[0069] Similarly, for the axial movement of the steel pipe, the steel pipe is clamped by the first straightening part 21 or the second straightening part 22, so that the support part 4 or the straightening assembly 2 drives the second straightening part 22 or the first straightening part 21 to move along the axial direction of the steel pipe, and then the steel pipe is clamped by the second straightening part 22 or the first straightening part 21, and the initially clamped first straightening part 21 or the second straightening part 22 is released and moved to the position where the steel pipe needs to be subsequently pressurized and straightened;

[0070] In this embodiment, the roller portion 2422 rotatably installed on the pressure block 242 is used to make the clamped steel pipe rotate relative to the roller portion 2422 to achieve the effect of rolling pressurization. The process of straightening the steel pipe is often under static pressure. In the process of straightening different parts of the steel pipe, unloading and then pressurizing operations need to be performed, and due to the existence of residual stress during processing, the pressurization process needs to be repeated multiple times; and the convenience of the steel pipe straightening process is improved.

[0071] Embodiment 2

[0072] like Figure 1-5 As shown, the components identical or corresponding to those in the first embodiment are marked with the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The second embodiment differs from the first embodiment in that:

[0073] It also includes a traction part 3 for guiding the movement of the transmission member 241 and the transmission accessory 2410, and the traction part 3 includes:

[0074] A rotating disk 31, wherein the rotating disk 31 is movably disposed on the end surface of the rotating member 240, and the rotating disk 31 and the rotating member 240 are coaxially disposed;

[0075] A guide groove 310, which is formed on the surface of the rotary disk 31 and is inclined to the radial direction of the rotary member 240;

[0076] The driven member 2411 is fixed to the transmission member 241 and the transmission accessory 2410 and is far from the pressing block 242 and is movably connected to the guide groove 310; and

[0077] The transmission part 311 , which is transmission-connected to the driving part 23 , is fixedly disposed on a side of the rotating member 240 facing the driving part 23 .

[0078] The transmission part 311 drives the rotating disk 31 to rotate, so that the guide groove 310 on the rotating disk 31 pulls the driven member 2411 to drive the transmission member 241 to move along the radial direction of the rotating member 240 .

[0079] In this embodiment, a coaxial turntable 31 is provided on the end surface of the rotating member 240, and a guide groove 310 inclined in the radial direction of the turntable 31 is matched, so that the rotation of the turntable 31 drives the driven member 2411 in the guide groove 310 to change the radial position, thereby pulling the transmission member 241 to move, and thus only a single driving part 23 is required to realize the feeding action of multiple transmission members 241 and the pressing block 242 in the circumferential direction of the steel pipe; the driving part 23 adopts, for example, a servo motor, and the transmission part 311 adopts respectively fixed The gears on the main shaft of the servo motor and the arc-shaped racks on the circumference of the turntable 31 also increase the transmission accuracy and efficiency through gear transmission, further improving the pressurization and straightening quality of the steel pipe by the pressure block 242; the guide groove 310 in the turntable 31 applies a radial driving force to the follower 2411 slidingly connected therein during the rotation process, so that the follower 2411 drives the transmission member 241 to move radially along the rotating member 240, thereby realizing the movement of the pressure block 242 relative to the steel pipe and playing a pressurization and straightening role.

[0080] like Figure 2-5 As shown in FIG. 7 , the radial length of the guide groove 310 in the rotating disk 31 is equal to the radial movement distance of the transmission member 241 in the rotating disk 240 , and the arc angle of the guide groove 310 in the circumferential direction of the rotating disk 31 is equal to the arc angle of the transmission member 311 in the circumferential direction of the rotating disk 31 .

[0081] By limiting the size of the guide groove 310 on the turntable 31 to match the moving stroke of the transmission member 241, the accuracy of the moving path of the traction follower 2411 and the fixed transmission member 241 thereon is controlled by rotation, so that the traction follower 2411 drives the pressure block 242 at the end of the transmission member 241 to move; in this embodiment, the inclined guide groove 310 is opened on the turntable 31 to synchronously and accurately control the pressurization and straightening process of several pressure blocks 242 on the circumference of the steel pipe; and the inclination degree of the guide groove 310 is used to control the rotation angle of the turntable 31 and the radial moving distance of the traction follower 2411, thereby improving the pressure torque that the servo motor of the drive unit 23 can provide to the transmission member 241, and expanding the stress range for providing pressurization in the process of straightening the steel pipe.

[0082] like Figure 4-5 As shown, the turntables 31 are arranged in pairs at the two end surfaces of the rotating member 240, and the pair of turntables 31 are respectively connected to the transmission member 241 and the transmission accessory 2410 through the driven member 2411, and the pair of turntables 31 rotate differentially under the action of the driving part 23 connected by the transmission.

[0083] In this embodiment, the driven member 2411 on the transmission member 241 and the transmission accessory 2410 are respectively movably connected in the guide groove 310 in the pair of rotating disks 31, and the two rotating disks 31 are respectively pulled by the driving part 23 to rotate differentially at different transmission ratios, so that the transmission member 241 and the transmission accessory 2410 are fed along the radial direction of the rotating member 240 by different distances, thereby realizing the control of the shape curvature of the pressing block 242;

[0084] It is worth mentioning that different driving parts 23 can also be used to pull the paired turntables 31. By setting the driving torque of the servo motor in the driving part 23, for steel pipes of different specifications, the stress applied by the transmission member 241 and the transmission accessory 2410 to the pressure block 242 can achieve the goal of deforming the pressure block 242 to evenly fit the surface of the steel pipe, instead of using different transmission ratios to achieve the effect of differential rotation between the return disks, effectively avoiding the curvature error of the deformation of the copper plate of the pressure block 242 due to the transmission error, further improving the control accuracy of the curvature shape of the pressure block 242, thereby improving the pressurization and straightening effect of the steel pipe.

[0085] Embodiment 3

[0086] like Figure 1-2 , 6, and 8, where the components identical or corresponding to those in the second embodiment are marked with the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the second embodiment are described below. The difference between the third embodiment and the second embodiment is that:

[0087] It also includes a support part 4 for clamping the steel pipe, and the support part 4 includes:

[0088] Support frames 41 are arranged in pairs at both ends of the steel pipe in the axial direction. The support frames 41 are movably arranged on the workbench 1; and

[0089] The shaft member 42 is movably connected between the pair of support frames 41 , and the second straightening portion 22 is movably connected to the shaft member 42 .

[0090] In this embodiment, one end of the shaft member 42 is passed through the first straightening portion 21, and the support frame 41 at the end thereof is moved away, and then the steel pipe is sleeved on the second straightening portion 22 of the shaft member 42. Then, according to the distance between the support frames 41 arranged in pairs according to the length condition of the clamped steel pipe, the driving parts 23 at both ends of the shaft member 42 feed the transmission member 241 and the transmission accessory 2410 in the rotating member 240 of the second straightening portion 22 differently, so that the circumferential pressing block 242 abuts against the inner wall of the steel pipe. After the clamping is completed, the pressure block 242 in the first straightening part 21 is adjusted so that the pressure block 242 corresponding to the second straightening part 22 contacts the outer wall of the steel pipe to avoid extrusion deformation caused by clamping the outer wall of the thin-walled seamless steel pipe. During the straightening process, the second straightening part 22 in the support part 4 moves on the workbench 1 along the axial direction of the steel pipe, driving the first straightening part 21 to move relative to the outer wall of the steel pipe, and cooperating with the second straightening part 22 on the inner wall of the steel pipe, various parts of the steel pipe can be pressurized and straightened conveniently.

[0091] like Figure 1 , 6 As shown in Figures 8 and 9, the shaft member 42 includes a first shaft segment 421 for fixing the rotating member 240 and a second shaft segment 422 for fixing the rotating disk 31. The second shaft segment 422 is sleeved on the first shaft segment 421. The second shaft segments 422 located on both sides of the end surface of the second straightening portion 22 are respectively connected to the driving portion 23.

[0092] The second straightening portion 22 clamped on the inner side of the steel pipe realizes separate control of the movements of the rotating member 240 and the turntable 31 through the first shaft segment 421 and the second shaft segment 422 which are connected inner and outer sleeves, and uses the first shaft segment 421 which does not need to rotate to support the rotating second shaft segment 422, thereby improving the stability of the second straightening portion 22, and cooperating with the different step amounts of the motor of the end side driving portion 23 of the second straightening portion 22, so that the turntables 31 on both sides of the rotating member 240 have different rotation amounts, thereby realizing different feed amounts of the transmission member 241 and the transmission accessory 2410, and realizing the control effect of the curvature shaping of the pressing block 242.

[0093] like Figure 8 As shown, it also includes a clamping portion 43 for mounting the rotating member 240, and the clamping portion 43 enables a plurality of second straightening portions 22 to be mounted on the shaft member 42, and the clamping portion 43 includes:

[0094] A through slot 431, wherein the through slot 431 is formed on the second shaft section 422 and exposes the first shaft section 421;

[0095] A key groove 432 corresponding to the position of the through groove 431 is formed on the first shaft segment 421 ; and

[0096] The crank key 433 movably connected to the rotating member 240 is used to engage with the key slot 432 .

[0097] In this embodiment, a locking screw is provided at the end of the rotating member 240 connected to the crank key 433. The crank key 433 is moved radially along the rotating member 240 by adjusting the locking screw, and then the rotating member 240 is installed in the keyway 432 of the second shaft segment 422. The through groove 431 provided on the second shaft segment 422 and the keyway 432 at the corresponding position on the first shaft segment 421 are used to operate the locking screw to tighten the unfolded crank key 433 into the keyway 432 of the first shaft segment 421 to complete the installation. Then, the turntable 31 is mounted on the second shaft segment 422 and assembled into the second straightening portion 22. By installing multiple second straightening portions 22 in the shaft member 42, it is suitable for pressurized straightening of longer steel pipes, thereby enhancing the stability of clamping the long steel pipes, thereby improving the pressurized straightening effect on thin-walled seamless steel pipes.

[0098] Working steps

[0099] Step 1: Clamp the steel pipe into the straightening assembly 2 on the workbench 1, so that the steel pipe is in a coaxial state with the first straightening part 21 and the second straightening part 22, and then use the driving part 23, such as a cylinder, to pull the transmission member 241, such as a connecting rod, to move radially along the disc of the rotating member 240, so that the pressure block 242 fixed on the end of the transmission member 241 abuts against the steel pipe, and as the force of the cylinder of the driving part 23 is gradually increased, the pressure blocks 242 abutting against the inner and outer sides of the steel pipe pressurize the pipe wall, and the plurality of transmission members 241 arranged around the rotating member 240 and the pressure blocks 242 thereon cooperate with each other to achieve a straightening effect.

[0100] Step 2: After the straightening is completed, the pressure of the cylinder of the driving part 23 is removed, the pressure block 242 of the first straightening part 21 and the second straightening part 22 is separated, and the position of the steel pipe in the straightening assembly 2 is adjusted, and the pressure straightening process is continued. This process is repeated to achieve the straightening operation of the entire steel pipe.

[0101] Step 3: Select a deformable pressing block 242 such as a copper plate, and a transmission accessory 2410 such as a support rod fixedly connected to the pressing block 242, and cooperate with the connecting rod of the transmission member 241, and feed different distances to the steel pipe under the action of the cylinder of different driving parts 23, so that the pressing block 242 connected to the end thereof presents an arc shape with different bending degrees.

[0102] Step 4: In the process of straightening the steel pipe, when thin-walled seamless steel pipes of different sizes are involved, the pressing block 242 of the same arc-shaped plate structure is directly used, and the deformation amount of the arc curvature of the pressing block 242 is controlled by setting the feed difference between the transmission member 241 and the transmission accessory 2410, so as to adapt to the pressurized straightening process of steel pipes of different sizes.

[0103] Step 5: For a steel pipe with a small straightness error, the rotating roller part 2422 is made to contact the surface of the steel pipe, and through the joint action of the first straightening part 21 and the pressure block 242 in the second straightening part 22, the rolling roller part 2422 applies stress along the inner and outer walls of the steel pipe respectively, thereby making the first straightening part 21 and the second straightening part 22 rotate together along the pipe wall of the steel pipe, directly pressurizing and straightening the entire wall surface of the steel pipe;

[0104] Step 6: For steel pipes with large straightness errors, the pressing block 242 in the first straightening part 21 can be directly pressed against the steel pipe, and the first straightening part 21 can be driven to rotate by the rotary motor on the support part 4, so as to change the position of the steel pipe relative to the second straightening part 22, and then the pressing block 242 on the second straightening part 22 is controlled to move to support and clamp the steel pipe, and then the pressure of the first straightening part 21 on the steel pipe is released and rotated to a position corresponding to the second straightening part 22, so as to complete the adjustment of the straightening area of ​​the steel pipe;

[0105] Step seven, for the axial movement of the steel pipe, the steel pipe is clamped by the first straightening part 21 or the second straightening part 22 in turn, so that the support part 4 or the straightening assembly 2 drives the second straightening part 22 or the first straightening part 21 to move along the axial direction of the steel pipe, and then the steel pipe is clamped by the second straightening part 22 or the first straightening part 21, and the initially clamped first straightening part 21 or the second straightening part 22 is released and moved to the position where the steel pipe needs to be subsequently pressurized and straightened.

[0106] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A straightening device for thin-walled seamless steel pipes, comprising a workbench, characterized in that: Also includes: A straightening assembly, wherein the straightening assembly is movably arranged on a workbench, and the straightening assembly comprises a plurality of first straightening parts arranged on the outside of the steel pipe and a plurality of second straightening parts arranged on the inside of the steel pipe; and A first driving part, a plurality of first driving parts fixedly arranged on one side of the straightening assembly, are respectively connected to the first straightening part and the second straightening part by transmission, and the first driving part enables the first straightening part and the second straightening part to move along the radial direction of the steel pipe on the workbench; The first straightening portion and the second straightening portion have the same structure, including: A rotating member, the rotating member having an annular structure is fixedly mounted on the workbench; and A transmission member, wherein the transmission member is movably arranged in the radial direction of the rotating member, and both ends of the transmission member are arranged through the inner and outer sides of the rotating member, and a pressing block for straightening is fixedly arranged at one end of the transmission member facing the steel pipe, and the other end of the transmission member is transmission-connected to the first driving part; The difference between the first straightening section and the second straightening section is that the driving parts move in opposite directions during the straightening process; The pressing block is an arc-shaped plate-shaped structure, and the transmission member also includes a transmission accessory for adjusting the shape of the pressing block, the two ends of the transmission accessory are respectively connected to the pressing block and the first driving part, and the paired transmission accessories are distributed on both sides of the transmission member along the circumference of the rotating member; In the process of moving the pressing block to the surface of the steel pipe for pressurization, the transmission parts and transmission accessories have different feed amounts, so that the plate-shaped pressing block forms an arc structure with different curvatures; The pressing block is fixedly provided with sliding blocks at both ends along the circumference of the rotating member, and the sliding blocks are provided with sliding grooves for movably connecting the transmission accessories; It also includes a traction part for guiding the movement of the transmission member and the transmission accessory, and the traction part includes: A rotating disk, the rotating disk is movably arranged on the end surface of the rotating member, and the rotating disk and the rotating member are arranged coaxially; A guide groove, the guide groove being provided on the surface of the rotary disk and being inclined to the radial direction of the rotary member; A driven member, which is fixedly mounted on the transmission member and the transmission accessory and is away from the pressing block end and is movably connected in the guide groove; and A transmission part, which is transmission-connected to the first driving part and is fixedly arranged on a side of the rotary disk facing the first driving part; The length of the guide groove in the radial direction of the rotary disk is equal to the moving distance of the transmission member in the radial direction of the rotary member, and the arc angle of the guide groove in the circumferential direction of the rotary disk is equal to the arc angle of the transmission member in the circumferential direction of the rotary disk; The rotating discs are arranged in pairs at both end surfaces of the rotating member, and the paired rotating discs are respectively connected to the transmission member and the transmission accessory through driven members, and the paired rotating discs rotate differentially under the action of the first driving part of the transmission connection.

2. A straightening device for thin-walled seamless steel pipe according to claim 1, characterized in that: It also includes a roller part for rolling and pressurizing the clamped steel pipe. The roller part is movably arranged on the side of the pressure block facing the steel pipe. The roller part protrudes from the surface of the pressure block and the axial direction of the roller part is parallel to the axial direction of the clamped steel pipe.

3. A straightening device for thin-walled seamless steel pipe according to claim 1, characterized in that: It also includes a support part for clamping the steel pipe, and the support part includes: Support frames, which are arranged in pairs at both ends of the steel pipe and are movably mounted on the workbench; and The shaft rod member is movably connected between the paired support frames, and the second straightening portion is movably connected to the shaft rod member.

4. A straightening device for thin-walled seamless steel pipe according to claim 3, characterized in that: The shaft member includes a first shaft section for fixing the rotating member and a second shaft section for fixing the rotating disk, the second shaft section is sleeved on the first shaft section, and the second shaft sections located on both sides of the end surface of the second straightening portion are respectively connected to the second driving portion.

5. A straightening device for thin-walled seamless steel pipe according to claim 4, characterized in that: It also includes a clamping part for installing the rotating member, the clamping part enables the shaft member to install a plurality of second straightening parts, and the clamping part includes: A through groove, wherein the through groove is formed on the second shaft section and exposes the first shaft section; A keyway, the keyway corresponding to the position of the through slot is provided on the first shaft segment; and A curved key movably connected to the rotating member is used to engage with the keyway.

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