CN211587959U

CN211587959U - Square pipe forming device

Info

Publication number: CN211587959U
Application number: CN201922486584.9U
Authority: CN
Inventors: 赵建华; 胡晓斐; 边叶森; 张海勇
Original assignee: Hebei Tupai Electromechanical Equipment Co ltd
Current assignee: Hebei Tupai Electromechanical Equipment Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-09-29
Anticipated expiration: 2029-12-31

Abstract

The utility model provides a square tub of forming device belongs to tubular product production facility technical field, including frame, aligning roller subassembly, vertical elevating system, horizontal sideslip mechanism and rotary mechanism. Wherein, the straightening roll component comprises an upper straightening roll, a lower straightening roll, a left straightening roll and a right straightening roll. And the vertical lifting mechanism is provided with two rollers which are used for driving the upper straightening roller and the lower straightening roller to move along the up-down direction respectively. The horizontal transverse moving mechanism is used for driving the left straightening roller and the right straightening roller to move relatively along the left and right directions respectively. The rotating mechanism is used for driving the upper straightening roller and the lower straightening roller to rotate respectively so as to prevent the square pipe from twisting in the forming process. The upper straightening roller and the lower straightening roller are respectively connected with the two rotating mechanisms in a one-to-one correspondence manner. The utility model provides a square tub of forming device can adapt to the shaping of the different square tub of big or small dimension specification, can prevent simultaneously that square tub of forming in-process from taking place the torsional condition, can improve the product quality of square tub.

Description

Square pipe forming device

Technical Field

The utility model belongs to the technical field of tubular product production facility, more specifically say, relate to a square tub of forming device.

Background

The square pipe is a pipe with a rectangular cross section and is generally of a hollow structure. The processing and forming method of the square tube is generally to straighten a hollow tube with a circular cross section by a forming device so as to change the hollow tube from a circular tube to a square tube.

In the prior art, the square pipe forming device straightens the circular pipe through straightening rollers which are arranged in four directions of the upper direction, the lower direction, the left direction and the right direction on the same plane so as to ensure the forming of the square pipe. Under the influence of factors such as environment, atress and manual operation, this kind of straightening mode often leads to taking place to twist reverse deformation (the front and back end of square pipe can take place to twist relatively for the axis of square pipe promptly) in the square pipe length direction after the shaping, can't guarantee the fashioned square pipe of straightening and keep the linear type in length direction, still need further carry out the straightening processing, waste time and energy. Moreover, when the straightening rolls in such a straightening structure are close to each other, interference between the straightening rolls is likely to occur, and thus it is not possible to adapt to a small-sized square pipe.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a square tub of forming device aims at solving current square tub of forming device adaptability poor, and can't carry out the problem of aligning processing to fashioned direction pipe.

In order to achieve the above object, the utility model adopts the following technical scheme: provided is a square pipe forming device, including:

a frame;

the straightening roller component comprises an upper straightening roller, a lower straightening roller, a left straightening roller and a right straightening roller and is used for straightening and forming the peripheral surface of the pipe;

the two vertical lifting mechanisms are arranged on the rack in a sliding manner and are used for respectively driving the upper straightening roller and the lower straightening roller to move along the up-down direction;

the two horizontal transverse mechanisms are respectively positioned at the left side and the right side of the square pipe and are positioned in the middle of the two vertical lifting mechanisms, and the two horizontal transverse mechanisms are arranged on the rack in a sliding manner and are used for respectively driving the left straightening roll and the right straightening roll to relatively slide along the left-right direction; and

the two rotating mechanisms are respectively arranged on the two vertical lifting mechanisms and are respectively used for driving the upper straightening roller and the lower straightening roller to rotate around the axis of the square pipe so as to apply reverse rotating force to the square pipe and prevent the square pipe from twisting in the forming process;

the left straightening roller and the right straightening roller are respectively connected with the two horizontal transverse moving mechanisms in a one-to-one correspondence mode, the upper straightening roller and the lower straightening roller are respectively connected with the two rotating mechanisms in a one-to-one correspondence mode, the two vertical lifting mechanisms are respectively located at the front end and the rear end of the square pipe forming feeding direction, and the two horizontal transverse moving mechanisms are located between the two vertical lifting mechanisms in the square pipe forming feeding direction.

As another embodiment of the present application, each of the vertical lifting mechanisms includes:

the lifting sliding plate is arranged on the rack in a sliding mode along the vertical direction, and a through hole for the square pipe to pass through is formed in the lifting sliding plate; and

the lifting driving assembly is fixedly arranged on the rack, is connected with the lifting sliding plate and is used for driving the lifting sliding plate to ascend or descend;

wherein, rotary mechanism install in on the lift slide.

As another embodiment of the present application, the rotating mechanism includes:

the rotary drum is rotatably connected with the through hole in the lifting sliding plate; and

the first driving assembly is fixedly arranged on the lifting sliding plate, is connected with the rotary drum and is used for adjusting the rotation angle of the rotary drum;

the rotary drum is provided with a protruding end portion protruding out of the through hole, and the upper straightening roller or the lower straightening roller is fixedly arranged at the protruding end portion of the rotary drum and used for synchronously rotating along with the rotary drum.

As another embodiment of the present application, the first driving assembly includes:

the worm wheel is sleeved on the peripheral surface of the rotary drum and is fixedly connected with the rotary drum;

the worm is rotationally arranged on the lifting sliding plate, is meshed with the worm wheel and is used for driving the worm wheel to rotate; and

and the first driver is fixedly arranged on the lifting sliding plate, and the output end of the first driver is connected with the worm and is used for driving the worm to rotate.

As another embodiment of the application, the lifting driving assembly is a lifter and is fixedly arranged on the rack, and a power output end of the lifter is connected with the lifting sliding plate and is used for driving the lifting sliding plate to move up and down.

As another embodiment of the present application, each of the horizontal traversing mechanisms includes:

the transverse moving sliding plate is arranged on the rack in a sliding manner; and

the sliding driving assembly is fixedly arranged on the rack, is connected with the transverse sliding plate and is used for driving the transverse sliding plate to slide in a reciprocating manner along the left side or the right side of the feeding direction of the square pipe forming;

and the left straightening roller or the right straightening roller is respectively and fixedly arranged on the transverse moving sliding plate and is used for synchronously moving along with the transverse moving sliding plate.

As another embodiment of the present application, two horizontal traversing mechanisms are oppositely arranged along the left-right direction, and two traverse sliding plates in the two horizontal traversing mechanisms are oppositely arranged along the left-right direction of the rack;

the left straightening roller is positioned on the transverse moving sliding plate in one of the horizontal transverse moving mechanisms and is rotationally connected with the transverse moving sliding plate, and the right straightening roller is positioned on the transverse moving sliding plate in the other horizontal transverse moving mechanism and is rotationally connected with the transverse moving sliding plate

As another embodiment of the application, the sliding driving component is a horizontally arranged elevator which is fixedly arranged on the rack, and a power output end of the elevator is connected with the transverse sliding plate and used for driving the transverse sliding plate to reciprocate left and right.

As another embodiment of the present application, the square pipe forming device further includes four roller boxes, and the four roller boxes are respectively used for mounting and fixing the roller boxes of the upper straightening roller, the lower straightening roller, the left straightening roller and the right straightening roller, and are used for limiting the left straightening roller and the right straightening roller;

the two roller boxes for mounting the upper straightening roller and the lower straightening roller are fixedly arranged on the two rotating mechanisms respectively and used for mounting and limiting the left straightening roller and the right straightening roller.

As another embodiment of the present application, the square pipe forming device further includes two second lifting assemblies, two second lifting assemblies are respectively and fixedly disposed on two roller boxes for mounting the upper straightening roller and the lower straightening roller, and are respectively and vertically moved in the roller boxes for driving the upper straightening roller and the lower straightening roller.

The utility model provides a square tub of forming device's beneficial effect lies in: compared with the prior art, the utility model discloses square pipe forming device main part comprises frame, aligning roller subassembly, vertical elevating system, horizontal sideslip mechanism and rotary mechanism. Wherein, the leveling roller subassembly includes last leveling roller, lower leveling roller, left leveling roller and right leveling roller, and left leveling roller and right leveling roller are located the intermediate position of last leveling roller and lower leveling roller, go up the relative setting of leveling roller and lower leveling roller slant, and four leveling rollers of this kind of structure of being convenient for can not take place to interfere when relative movement, can adapt to the shaping of the square pipe of the different size specifications. Meanwhile, the four straightening rollers arranged in different directions can straighten the round pipe into a square shape, and the straightness of the square pipe can be ensured to a certain extent. The two vertical lifting mechanisms can respectively drive the upper straightening roller and the lower straightening roller to move up and down, so that the upper straightening roller and the lower straightening roller can be conveniently adjusted; the two horizontal cross-sliding mechanisms can respectively drive the left straightening roller and the right straightening roller to relatively slide, and the left straightening roller and the right straightening roller can be conveniently adjusted. The two rotating mechanisms are arranged on the two vertical lifting mechanisms respectively and can drive the upper straightening rollers and the lower straightening rollers to rotate at different angles, so that the square pipe can be corrected in time when twisted, and the quality of the formed square pipe can be guaranteed. The utility model provides a square tub of forming device can adapt to the shaping of the different square pipe of size and dimension specification through the crisscross leveling roller structure that distributes, and the rotary mechanism that sets up simultaneously can prevent to take place the torsional condition in the square pipe forming process, can improve the product quality of square pipe.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic view of a rectangular pipe forming device according to an embodiment of the present invention;

fig. 2 is a schematic side view of a square pipe forming device according to an embodiment of the present invention;

FIG. 3 is a schematic view of the structure of FIG. 2 along line A-A;

fig. 4 is a schematic structural diagram of a position of a straightening roller assembly of the square pipe forming device according to an embodiment of the present invention;

in the figure: 10. a frame; 20. a straightening roll assembly; 21. an upper straightening roll; 22. a lower straightening roll; 23. a left straightening roll; 24. a right straightening roll; 30. a vertical lifting mechanism; 31. a lifting slide plate; 32. a lift drive assembly; 40. a horizontal traversing mechanism; 41. transversely moving the sliding plate; 42. a traverse driving assembly; 50. a rotation mechanism; 51. A rotating drum; 52. a first drive assembly; 521. a worm gear; 522. a worm; 523. a first driver; 60. a roller box; 70. a second lifting assembly; 80. a square tube.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 4, a square pipe forming apparatus according to the present invention will now be described. The square pipe forming device comprises a rack 10, a straightening roller assembly 20, a vertical lifting mechanism 30, a horizontal traversing mechanism 40 and a rotating mechanism 50. The straightening roller assembly 20 comprises an upper straightening roller 21, a lower straightening roller 22, a left straightening roller 23 and a right straightening roller 24 and is used for straightening and forming a pipe through the periphery, and the left straightening roller 23 and the right straightening roller 24 are positioned at the middle position of the upper straightening roller 21 and the lower straightening roller 22 along the feeding direction of the forming of the square pipe 80. And two vertical lifting mechanisms 30 are arranged, the two vertical lifting mechanisms 30 are arranged on the rack 10 in a sliding manner, and are arranged oppositely along the feeding direction of the square pipe 80 for respectively driving the upper straightening roll 21 and the lower straightening roll 22 to move along the up-and-down direction. The number of the horizontal transverse moving mechanisms 40 is two, the two horizontal transverse moving mechanisms 40 are arranged oppositely and are located in the middle positions of the two vertical lifting mechanisms 30, and the two horizontal transverse moving mechanisms 40 are arranged on the rack 10 in a sliding mode and are used for driving the left straightening roll 23 and the right straightening roll 24 to move relatively in the left-right direction respectively. And two rotating mechanisms 50 are arranged, wherein the two rotating mechanisms 50 are respectively arranged on the two vertical lifting mechanisms 30 and are respectively used for driving the upper straightening rollers 21 and the lower straightening rollers 22 to rotate so as to prevent the square pipe 80 from twisting in the forming process. Wherein, the left straightening roll 23 and the right straightening roll 24 are respectively connected with the two horizontal cross moving mechanisms 40 in a one-to-one correspondence manner, and the upper straightening roll 21 and the lower straightening roll 22 are respectively connected with the two rotating mechanisms 50 in a one-to-one correspondence manner.

This use novel square pipe forming device that provides, the theory of operation is: the circular pipe sequentially passes through the lower straightening roller 22, the left straightening roller 23, the right straightening roller 24 and the upper straightening roller 21 along the feeding direction, wherein each straightening roller can be adjusted to move without interference, and the square pipe 80 with different sizes and specifications can be formed in a guaranteed manner; furthermore, the rotating mechanism 50 is provided to adjust the angle of the upper straightening roll 21 or the lower straightening roll 22 to ensure that the square pipe 80 is not twisted.

It should be noted that the straightening roll assembly 20 further includes a power assembly, and the power assembly drives the upper straightening roll 21, the lower straightening roll 22, the left straightening roll 23 and the right straightening roll 24 to rotate respectively.

The utility model provides a square pipe forming device compares with prior art, the utility model discloses square pipe forming device main part comprises frame 10, leveling roller subassembly 20, vertical elevating system 30, horizontal sideslip mechanism 40 and rotary mechanism 50. Wherein, the leveling roller assembly 20 includes upper leveling roller 21, lower leveling roller 22, left leveling roller 23 and right leveling roller 24, and left leveling roller 23 and right leveling roller 24 are located the intermediate position of upper leveling roller 21 and lower leveling roller 22, and upper leveling roller 21 and lower leveling roller 22 slant are relative the setting, and this kind of structure is convenient for four leveling rollers can be when relative movement, can not take place to interfere, can adapt to the shaping of the square pipe 80 of the different size specifications. Meanwhile, the four straightening rollers arranged in different directions can straighten the round pipe into a square shape, and the straightness of the square pipe 80 can be ensured to a certain extent. The two vertical lifting mechanisms 30 are arranged, the two vertical lifting mechanisms 30 can respectively drive the upper straightening roll 21 and the lower straightening roll 22 to move up and down, and the adjustment of the upper straightening roll 21 and the lower straightening roll 22 can be facilitated; the two horizontal cross-sliding mechanisms 40 can respectively drive the left straightening roll 23 and the right straightening roll 24 to relatively slide, and can facilitate the adjustment of the left straightening roll 23 and the right straightening roll 24. The two rotating mechanisms 50 are arranged, the two rotating mechanisms 50 are respectively arranged on the two vertical lifting mechanisms 30 and can respectively drive the upper straightening rollers 21 and the lower straightening rollers 22 to rotate at different angles, so that the square pipes 80 can be corrected in time when twisted, and the quality of the formed square pipes 80 is ensured. The utility model provides a square tub of forming device can adapt to the shaping of the different square tub of 80 of big or small size specification through the crisscross leveling roller structure that distributes, and the rotary mechanism 50 that sets up simultaneously can prevent to take place the torsional condition in the square tub of 80 forming process, can improve the product quality of square tub of 80.

As a specific embodiment of the square tube forming device provided in the present invention, please refer to fig. 1 to 4 together, each vertical lifting mechanism 30 includes a lifting slide plate 31 and a lifting driving assembly 32. The lifting slide plate 31 is arranged on the rack 10 in a sliding manner along the vertical direction, a through hole for the pipe to pass through is formed in the lifting slide plate 31, so that the pipe can pass through the lifting slide plate 31, and the rotating mechanism 50 is arranged on the lifting slide plate 31, so that the rotating mechanism 50 can lift together with the lifting slide plate 31. The lifting driving assembly 32 is fixedly arranged on the frame 10 and connected with the lifting sliding plate 31, and can drive the lifting sliding plate 31 to ascend or descend so as to ensure the lifting adjustment of the upper straightening roll 21 or the lower straightening roll 22.

In this embodiment, the frame 10 is provided with a rail for the lifting slider 31 to slide up and down, and the lifting slider 31 is slidably disposed in the rail.

As a specific implementation manner of the square tube forming apparatus provided in the embodiment of the present invention, please refer to fig. 1 to 4, the rotating mechanism 50 includes a rotating drum 51 and a first driving assembly 52. Wherein, the through-hole in rotary drum 51 and the lift slide 31 rotates to be connected, and the fashioned square pipe can feed to the through-hole in rotary drum 51, and the direction pipe of being convenient for feeds the conveying, and the rotation is also convenient for to this kind of structure simultaneously. The first driving assembly 52 is fixedly disposed on the lifting slide plate 31, and is connected to the rotating drum 51, so as to adjust a rotation angle of the rotating drum 51. The upper straightening roller 21 or the lower straightening roller 22 is fixedly arranged at the extending end part of the rotary drum 51 and can synchronously rotate along with the rotary drum 51. The rotating mechanism 50 can ensure that the upper straightening roller 21 or the lower straightening roller 22 rotates a certain angle around the axis of the square pipe, so that the formed square pipe 80 can be corrected accurately when twisted.

As a specific implementation manner of the square tube forming device provided in the embodiment of the present invention, please refer to fig. 1 to fig. 4, the first driving assembly 52 includes a worm wheel 521, a worm 522 and a first driver 523. The worm gear 521 is sleeved on the outer circumferential surface of the drum 51 and is fixedly connected with the drum 51. The worm 522 is rotatably disposed on the lifting slide plate 31 and engaged with the worm wheel 521 for driving the worm wheel 521 to rotate. The first driver 523 is fixedly arranged on the lifting sliding plate 31, and the output end of the first driver is connected with the worm 522 and can drive the worm 522 to rotate. Worm gear 522 can have the steady characteristics of transmission, and can take place the auto-lock, the adjustment of the rotary drum 51 angle of being convenient for.

In this embodiment, the worm wheel 521 may be a ring worm wheel 521, a semi-ring worm wheel 521, or a sector worm wheel 521, and is fixedly connected to the drum 51 through a positioning key. The first driver 523 may be a servo motor. In this embodiment, during the rolling process of the direction tube, the square tube needs to be measured or viewed in time, and whether the front end and the rear end of the square tube are twisted relatively to the central axis of the square tube 80 or not is determined. If torsion occurs, the worm 521 is adjusted in time to ensure that the upper straightening roll 21 and the lower straightening roll 22 are rotationally adjusted to straighten the square pipe 80.

As an embodiment of the present invention, please refer to fig. 1 to 4 together, the lifting driving assembly 32 is a lift, and is fixed to the frame 10, the power output end is connected to the lifting slide plate 31, the lift can stably drive the lifting slide plate 31 to move up and down, so that the upper straightening roll 21 or the lower straightening roll 22 can be adjusted along the vertical direction.

As a specific implementation manner of the square tube forming device provided in the embodiment of the present invention, please refer to fig. 1 to 4, each horizontal traversing mechanism 40 includes a traversing sliding plate 41 and a traversing driving assembly 42. Wherein, the traverse slide 41 is slidably disposed on the frame 10. The sliding driving assembly is fixedly arranged on the frame 10, is connected with the traverse sliding plate 41, and is used for driving the traverse sliding plate 41 to slide back and forth along the left side or the right side of the feeding direction of the square pipe 80. The left straightening roller 23 or the right straightening roller 24 is respectively and fixedly arranged on the cross sliding plate 41 and is used for synchronously moving along with the cross sliding plate 41. The structure mainly can realize the adjustment of the left straightening roller 23 or the right straightening roller 24, and further ensures the adaptability of the straightening roller assembly 20.

As a specific implementation manner of the square tube forming device provided by the embodiment of the present invention, please refer to fig. 1 to fig. 4 together, two horizontal sliding mechanisms 40 are disposed relatively along the left and right directions of the square tube 80, and two horizontal sliding plates 41 in the two horizontal sliding mechanisms 40 are disposed relatively along the left and right directions of the frame 10. The left straightening roller 23 or the right straightening roller 24 is positioned on a cross sliding plate 41 in one of the horizontal cross sliding mechanisms 40 and is rotatably connected with the cross sliding plate 41. The right straightening roller 24 or the left straightening roller 23 is positioned on a traverse slide 41 in another horizontal traverse mechanism 40 and is rotatably connected with the traverse slide 41. The left and right straightening rollers 24 can move relatively to straighten and form the two sides of the pipe respectively.

In this embodiment, the rack 10 is provided with guide rails for sliding the two traverse sliding plates 41, so as to support the traverse sliding plates 41.

As an embodiment of the present invention, please refer to fig. 1 to 4 together, the sliding driving assembly 42 is a horizontally disposed elevator, and is fixed to the frame 10, and the power output end is connected to the lateral sliding plate 41, and can drive the lateral sliding plate 41 to move along the left and right directions, so as to facilitate the left and right adjustment of the left straightening roller 23 or the right straightening roller 24.

As an embodiment of the present invention, please refer to fig. 1 to 4 together, the square tube forming device further includes four roller boxes 60, and the roller boxes 60 are provided with four rollers 60, and are respectively used for installing and fixing the roller boxes 60 of the upper straightening roll 21, the lower straightening roll 22, the left straightening roll 23 and the right straightening roll 24, and for limiting the left straightening roll 23 and the right straightening roll 24. Wherein, two roller boxes 60 for installing the upper straightening roller 21 and the lower straightening roller 22 are respectively and fixedly arranged on the two rotating mechanisms 50, and two roller boxes 60 for installing and limiting the left straightening roller 23 and the right straightening roller 24 are fixedly arranged on the frame 10. The roller box 60 can ensure the stability of the upper straightening roller 21, the lower straightening roller 22, the left straightening roller 23 and the right straightening roller 24, and ensure that the upper straightening roller 21, the lower straightening roller 22, the left straightening roller 23 and the right straightening roller 24 are supported and limited when the stress is large.

As an embodiment of the present invention, please refer to fig. 1 to 4 together, the square pipe forming device further includes two second lifting assemblies 70, the two second lifting assemblies 70 are provided with two, the two second lifting assemblies 70 are respectively fixed on two roller boxes 60 for installing the upper straightening roller 21 and the lower straightening roller 22, and are respectively used for driving the upper straightening roller 21 and the lower straightening roller 22 to move up and down in the roller boxes 60. Further realizing fine adjustment of the upper straightening roll 21 and the lower straightening roll 22 to ensure the product quality of the square pipe 80.

In this embodiment, the second lifting assembly 70 may be a servo motor.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. Square tub of forming device, its characterized in that includes:

a frame;

2. The square tube forming apparatus of claim 1, wherein each of the vertical elevating mechanisms comprises:

wherein, rotary mechanism install in on the lift slide.

3. The square tube forming apparatus of claim 2, wherein the rotating mechanism comprises:

4. The square tube forming apparatus of claim 3, wherein the first driving assembly comprises:

5. The square pipe forming device as claimed in any one of claims 2-4, wherein the lifting driving assembly is a lifter, which is fixed to the frame, and a power output end of the lifter is connected to the lifting slide plate for driving the lifting slide plate to move up and down.

6. The square tube forming apparatus of claim 1, wherein each of said horizontal traversing mechanisms comprises:

7. The square tube forming apparatus as claimed in claim 6, wherein two of said horizontal traversing mechanisms are disposed oppositely in a left-right direction, and two of said traversing sliding plates of the two horizontal traversing mechanisms are disposed oppositely in a left-right direction of the frame;

the left straightening roller is positioned on the transverse moving sliding plate in one of the horizontal transverse moving mechanisms and is rotationally connected with the transverse moving sliding plate, and the right straightening roller is positioned on the transverse moving sliding plate in the other horizontal transverse moving mechanism and is rotationally connected with the transverse moving sliding plate.

8. The square tube forming apparatus as claimed in claim 7, wherein the sliding driving unit is a horizontally disposed elevator fixed to the frame, and a power output end of the elevator is connected to the traverse slide for driving the traverse slide to reciprocate left and right.

9. The square tube forming device as claimed in any of claims 1 to 4, further comprising four roll cassettes for mounting and fixing the upper straightening roll, the lower straightening roll, the left straightening roll and the right straightening roll, respectively, and for limiting the left straightening roll and the right straightening roll;

10. The square tube forming device as claimed in claim 9, further comprising two second lifting units, wherein two second lifting units are provided, and are respectively fixed to two roller boxes for mounting the upper straightening roll and the lower straightening roll, and are respectively used for driving the upper straightening roll and the lower straightening roll to move up and down in the roller boxes.