High-precision two-roller pipe straightening machine

Abstract

The invention belongs to the technical field of pipe straightening, and discloses a high-precision two-roller pipe straightening machine which comprises a fixed cross beam, a first hydraulic cylinder and a movable cross beam and further comprises straightening rollers arranged on the opposite sides of the fixed cross beam and the movable cross beam respectively. The limiting mechanism I is arranged on one side of the fixed cross beam; a piston rod pushes a first clamping plate corresponding to the piston rod to make contact with the surface of a pipe, the pipe is limited, finally, the bending point of the bent pipe rotates between the first clamping plates, one first clamping plate is extruded to be shrunk into a sliding shell, and the first clamping plate corresponding to the first clamping plate continues to move towards the surface of the pipe; the pipe is limited, so that it is ensured that the pipe is subjected to uniform extrusion force, the swing amplitude of the pipe is reduced, the pipe is prevented from being flattened by a straightening roller due to the fact that the pipe deviates in the straightening process, and the phenomenon that spiral threads appear on the inner wall of the pipe is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of pipe straightening, in particular to a high-precision two-roller pipe straightening machine. Background Art

[0002] High-precision two-roller pipe straightening machine is a professional mechanical equipment, mainly used for high-precision straightening of metal pipes; At present, the traditional high-precision two-roller tube straightening machine accurately transports the tube to be straightened to a predetermined position between the straightening rollers, and then effectively straightens the high-precision metal tube by driving the rotation of the straightening rollers.

[0003] However, although the two-beam four-column or three-beam four-column structure design commonly used in traditional straightening machines provides the necessary stability and support for the straightening process to a certain extent, ensuring the reliability of the equipment under heavy load and high-speed operation, in actual operation, this design also exposes some limitations. In particular, during the straightening process, the pipes tend to rotate with the straightening. When these bent pipes rotate between the straightening rollers, they rotate around the bending point as the axis. This rotation method can easily cause the pipe to swing widely, which not only reduces the accuracy and efficiency of straightening, but also may cause the position of the pipe to shift between the straightening rollers. What's more serious is that due to the uneven extrusion and friction forces on the pipe during the swinging process, the inner wall of the pipe is very likely to have spiral patterns. Summary of the invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a high-precision two-roller pipe straightening machine.

[0005] To achieve the above object, the present invention provides the following technical solution: a high-precision two-roller tube straightening machine, comprising a fixed crossbeam, a hydraulic cylinder, a movable crossbeam, and also comprising: Straightening rollers are respectively arranged on opposite sides of the fixed crossbeam and the movable crossbeam; A first limiting mechanism, which is arranged on one side of the fixed beam; Wherein, the limiting mechanism 1 includes a fixed block 1, the fixed block 1 is fixedly connected to one side of the fixed crossbeam, the interior of the fixed block 1 is slidably connected to a sliding shell, the interior of the sliding shell is slidably connected to a clamping plate 1, a piston rod is arranged between the sliding shell and the clamping plate 1, the number of the piston rods is six, and each two are in a group, one side of the two piston rods is connected by a connecting hose, and the clamping plate 1 is elastically connected to the sliding shell by a spring 1; The driving component 1 is arranged inside the fixing block 1 and can drive the clamping plate 1 to limit the pipe.

[0006] Preferably, the driving assembly 1 includes a gear 1, which is rotatably connected to the inside of a fixed block 1, a rack meshing with the gear 1 is fixedly installed on one side of the sliding shell, a gear ring meshing with the gear 1 is rotatably connected to the inside of the fixed block 1, a motor 1 is fixedly installed on one side of the outer surface of the fixed block 1, and a gear 2 meshing with the gear ring is fixedly installed on the output end of the motor 1.

[0007] Preferably, it also includes: a limiting mechanism 2, which is arranged on the other side of the fixed beam, the limiting mechanism 2 includes a fixed block 2, the fixed block 2 is fixedly connected to the other side of the fixed beam, the fixed block 2 is internally slidably connected with a clamping plate 2, the fixed block 2 is internally rotatably connected with a gear disk, the gear disk is provided with a slide groove, one side of the clamping plate 2 is fixedly installed with a connecting shaft located inside the slide groove, one side of the outer surface of the fixed block 2 is fixedly installed with a motor 2, and the output end of the motor 2 is fixedly installed with a gear 3 meshing with the gear disk.

[0008] Preferably, a fixing mechanism is arranged on the other side of the fixed crossbeam, the fixing mechanism comprises a mounting shell, a sliding block is slidably connected inside the mounting shell, the mounting shell and the sliding block are elastically connected via a second spring, a second hydraulic cylinder is fixedly installed inside the sliding block, and a limiting shell located inside the sliding block is fixedly installed on the output shaft of the second hydraulic cylinder; The damping mechanism is arranged inside the mounting shell and can slow down the descending speed of the sliding block.

[0009] Preferably, the damping mechanism includes a spring three, the spring three is fixedly connected to the inside of the mounting shell, a fixing plate is fixedly installed on the side of the spring three away from the sliding block, a mounting block is fixedly installed on the top of the fixing plate, a grinding wheel is rotatably connected to the side of the mounting block close to the sliding block, and extrusion plates are fixedly installed on both sides of the outer surface of the sliding block.

[0010] Preferably, balls are rollingly connected inside the first and second clamping plates respectively, and the surfaces of the balls can contact the surface of the pipe.

[0011] Preferably, the slide groove is of curved design, there are multiple slide grooves, and the slide groove array is distributed on the surface of the gear disc.

[0012] Preferably, one side of the mounting block and the extrusion plate are both designed as inclined surfaces, and the two inclined surfaces are parallel to each other.

[0013] Preferably, a gap is provided between the gear ring and the sliding shell, and the gear 1 and the gear ring are on the same horizontal line.

[0014] Preferably, the top of the sliding block and the top of the inner part of the limiting shell are both designed to be arc-shaped, and the surface of the grinding wheel is designed to be rough.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention drives the motor 1 to drive the gear 2 to drive the gear ring and the gear 1 to rotate, and the gear 1 drives the rack, the sliding shell and the clamping plate 1 to move on the surface of the pipe. Then, the resilience of the spring 1 is used to make the clamping plate 1 initially clamp the pipe. When one of the clamping plates 1 is pushed to shrink into the sliding shell at the bending part of the pipe, the spring 1 will continue to be compressed, and the clamping plate 1 will squeeze the air inside the piston rod, and the air inside the piston rod will enter the other piston rod through the connecting hose. Then the corresponding piston rod will push the corresponding clamping plate 1 to contact with the surface of the pipe and limit the pipe. Finally, the bending point of the bent pipe will rotate between the clamping plates 1, and squeeze one clamping plate 1 to shrink into the sliding shell, and the corresponding clamping plate 1 will continue to move toward the surface of the pipe to limit the pipe, thereby ensuring that the pipe is subjected to uniform extrusion force, reducing the swing amplitude of the pipe, avoiding the deviation of the pipe during the straightening process, causing the straightening roller to flatten the pipe, and reducing the phenomenon of spiral lines on the inner wall of the pipe. The present invention utilizes the weight of the pipe to squeeze the sliding block to shrink into the inside of the mounting shell. When the sliding block moves, the squeezing plate will move downward accordingly. The squeezing plate and the mounting block will squeeze and push the mounting block to move toward the surface of the sliding block. When the mounting block moves, the spring three will be stretched, and then the mounting block will push the grinding wheel to contact the surface of the sliding block. The friction between the grinding wheel and the sliding block will cause the grinding wheel to rotate, thereby slowing down the moving speed of the sliding block, so that the sliding block can stably place the pipe on the surface of the conveying roller. Finally, the weight of the pipe is utilized to enable the sliding block to stably place the pipe on the surface of the conveying roller, so that the pipe can be prevented from directly falling on the surface of the conveying roller to damage the surface of the pipe, thereby helping to improve its overall durability and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention from another perspective; Figure 3 This is a cross-sectional schematic diagram of a fixed crossbeam of the present invention; Figure 4 A schematic diagram of a cross-sectional view of a fixing block of the present invention; Figure 5 This is a schematic diagram showing a limiting mechanism of the present invention; Figure 6 It is a schematic diagram of a cross-sectional sliding shell of the present invention; Figure 7 A schematic diagram of a cross-sectional splint of the present invention; Figure 8 This is a schematic diagram of a second cross-sectional fixed block of the present invention; Fig. 9This is a schematic diagram showing the connecting shaft of the present invention; Fig.10 It is a schematic diagram of a cross-sectional installation shell of the present invention; Fig.11 It is a schematic diagram of a cross-sectional sliding block of the present invention; Fig.12 This is a schematic diagram showing the working of a splint of the present invention.

[0017] In the figure: 1, fixed beam; 2, hydraulic cylinder 1; 3, movable beam; 4, straightening roller; 5, limit mechanism 1; 501, fixed block 1; 502, sliding shell; 503, clamping plate 1; 504, piston rod; 505, connecting hose; 506, spring 1; 6, drive assembly 1; 601, gear 1; 602, rack; 603, gear ring; 604, motor 1; 605, gear 2; 7, limit mechanism 2; 701, fixed block 2; 702, splint 2; 703, connecting shaft; 704, toothed disc; 705, slide groove; 706, motor 2; 707, gear 3; 8, fixing mechanism; 801, mounting shell; 802, spring 2; 803, sliding block; 804, hydraulic cylinder 2; 805, limiting shell; 9, damping mechanism; 901, spring 3; 902, fixing plate; 903, mounting block; 904, grinding wheel; 905, extrusion plate; 10, ball bearing. DETAILED DESCRIPTION

[0018] 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, not all of the 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.

[0019] like Figures 1 to 12 As shown, the present invention provides a high-precision two-roller tube straightening machine, including a fixed crossbeam 1, a hydraulic cylinder 2, a movable crossbeam 3, and also includes: The straightening rollers 4 are respectively arranged on opposite sides of the fixed crossbeam 1 and the movable crossbeam 3; A limiting mechanism 5, which is arranged on one side of the fixed beam 1; The limiting mechanism 5 includes a fixed block 501, which is fixedly connected to one side of the fixed beam 1. The fixed block 501 is slidably connected to a sliding shell 502 inside, and the sliding shell 502 is slidably connected to a clamping plate 503 inside. A piston rod 504 is arranged between the sliding shell 502 and the clamping plate 503. There are six piston rods 504, and each two of them form a group. One side of the two piston rods 504 is connected through a connecting hose 505, and the clamping plate 503 is elastically connected to the sliding shell 502 through a spring 506. A driving assembly 6 is disposed inside a fixing block 501 and can drive a clamping plate 503 to limit the position of the pipe.

[0020] The above scheme is adopted: the operator inserts the high-precision metal tube to be straightened between the six clamps 503, and puts the tube between the two straightening rollers 4, and then the hydraulic cylinder 2 can be driven to make the straightening roller 4 at the bottom end of the movable crossbeam 3 contact the tube. At the same time, the driving component 6 can be driven, and the driving component 6 will drive the rack 602 and the gear ring 603 to contact the surface of the tube, and the gear ring 603 will shrink into the sliding shell 502, and then the spring 506 will be compressed. The resilience of the spring 506 can be used to clamp the tube, and the clamps 503 can be set according to the thickness of the tube. The corresponding number of them can avoid the tube from getting stuck when it rotates. Then the two straightening rollers 4 can be driven to rotate at the same time, and the tube will be pressed during the rotation. Straightening is performed, and during the straightening process, the pipe will rotate along with it, and then the bent pipe will rotate between the clamps 503, and during the rotation process, the bending part of the pipe will push one of the clamps 503 to shrink into the sliding shell 502, and the spring 506 will continue to be compressed, and then the clamp 503 will squeeze the air inside the piston rod 504, and the air inside the piston rod 504 will enter the other piston rod 504 through the connecting hose 505, and then the piston rod 504 will push the corresponding clamp 503 to contact the surface of the pipe, and limit the pipe to reduce the risk of swinging of the pipe, avoid the pipe rotating at the bending point, produce a large rotation amplitude, and the pipe will be offset, causing the straightening roller 4 to flatten the pipe, reducing the phenomenon of spiral patterns on the inner wall of the pipe.

[0021] like Figure 4 , Figure 5 and Figure 6 As shown, the driving component 16 includes a gear 1601, which is rotatably connected to the inside of the fixed block 1501, a rack 602 meshing with the gear 1601 is fixedly installed on one side of the sliding shell 502, a gear ring 603 meshing with the gear 1601 is rotatably connected to the inside of the fixed block 1501, a motor 1604 is fixedly installed on one side of the outer surface of the fixed block 1501, and a gear 2 605 meshing with the gear ring 603 is fixedly installed on the output end of the motor 1604.

[0022] The above scheme is adopted: through the design of driving component 1 6, motor 1 604 can be driven to rotate gear 2 605, because gear 2 605 is meshed with gear ring 603, and gear ring 603 is meshed with gear 1 601, and then the rotating gear ring 603 will drive gear ring 603 to rotate, and gear ring 603 will drive gear 1 601 to rotate, and because gear 1 601 is meshed with rack 602, gear 1 601 will drive rack 602 to move, and rack 602 will drive sliding shell 502 and splint 1 503 to move toward the surface of the pipe, thereby limiting the position of the pipe.

[0023] like Figure 8 and Fig. 9 As shown, it also includes: a limiting mechanism 2 7, which is arranged on the other side of the fixed beam 1, and the limiting mechanism 2 7 includes a fixed block 2 701, and the fixed block 2 701 is fixedly connected to the other side of the fixed beam 1. The fixed block 2 701 is internally slidably connected with a clamping plate 2 702, and the fixed block 2 701 is internally rotatably connected with a gear disk 704, and a slide groove 705 is provided inside the gear disk 704. A connecting shaft 703 located inside the slide groove 705 is fixedly installed on one side of the clamping plate 2 702, and a motor 2 706 is fixedly installed on one side of the outer surface of the fixed block 2 701, and a gear 3 707 meshing with the gear disk 704 is fixedly installed on the output end of the motor 2 706.

[0024] The above scheme is adopted: through the design of the limiting mechanism 2 7, after the straightening of the pipe is completed, the pipe will be axially transported by the straightening roller 4 to between the clamping plates 2 702, and then the motor 2 706 can be driven to rotate the gear 3 707. Because the gear 3 707 is engaged with the toothed disc 704, the gear 3 707 will drive the toothed disc 704 to rotate, and the connecting shaft 703 will slide on the inner wall of the slide groove 705, and then the connecting shaft 703 will drive the clamping plate 2 702 to move toward the surface of the pipe, and then the clamping plate 2 702 can limit the straightened pipe.

[0025] like Fig.10 and Fig.11 As shown, the fixing mechanism 8 is arranged on the other side of the fixed beam 1, and the fixing mechanism 8 includes a mounting shell 801, and a sliding block 803 is slidably connected inside the mounting shell 801, and the mounting shell 801 and the sliding block 803 are elastically connected through a second spring 802, and a second hydraulic cylinder 804 is fixedly installed inside the sliding block 803, and a limiting shell 805 located inside the sliding block 803 is fixedly installed on the output shaft of the second hydraulic cylinder 804; The damping mechanism 9 is arranged inside the mounting shell 801 and can slow down the descending speed of the sliding block 803 .

[0026] The above scheme is adopted: through the design of the fixing mechanism 8, when the limiting mechanism 27 limits the pipe, the pipe will enter between the sliding block 803 and the limiting shell 805, and after all the pipes are discharged from the limiting mechanism 27, the hydraulic cylinder 2 804 will instantly pull the limiting shell 805 down, and then fix the pipe, and use the weight of the pipe to squeeze the sliding block 803 to shrink into the inside of the mounting shell 801, and the moving sliding block 803 will squeeze the spring 2 802, and in the process of the sliding block 803, the damping mechanism 9 can slow down the moving speed of the sliding block 803, thereby making the sliding block 803 move slowly, and then the sliding block 803 will lightly place the pipe on the surface of the conveying roller, and the conveying roller can drive the pipe for subsequent processing.

[0027] like Fig.10 and Fig.11 As shown, the damping mechanism 9 includes a spring three 901, which is fixedly connected to the inside of the mounting shell 801, a fixing plate 902 is fixedly installed on the side of the spring three 901 away from the sliding block 803, a mounting block 903 is fixedly installed on the top of the fixing plate 902, a grinding wheel 904 is rotatably connected to the side of the mounting block 903 close to the sliding block 803, and extrusion plates 905 are fixedly installed on both sides of the outer surface of the sliding block 803.

[0028] The above scheme is adopted: through the design of the damping mechanism 9, when the sliding block 803 descends, the extrusion plate 905 will move downward accordingly, and then the extrusion plate 905 will contact the mounting block 903, and will squeeze and push the mounting block 903 to move toward the surface of the sliding block 803, and when the mounting block 903 moves, the spring three 901 will be stretched, and then the mounting block 903 will push the grinding wheel 904 to contact the surface of the sliding block 803, and the friction between the grinding wheel 904 and the sliding block 803 will cause the grinding wheel 904 to rotate, thereby slowing down the moving speed of the sliding block 803, so that the sliding block 803 can smoothly place the pipe on the surface of the conveyor roller.

[0029] like Figure 7 and Fig. 9 As shown, the inside of the first clamping plate 503 and the second clamping plate 702 are respectively connected with balls 10 in a rolling manner, and the surface of the balls 10 can contact the surface of the pipe.

[0030] The above scheme is adopted: through the design of the ball 10, when the splint 1 503 and the splint 2 702 move toward the surface of the tube, the surface of the ball 10 will contact the surface of the tube, and the friction between the tube and the ball 10 will be utilized, so that the ball 10 can roll inside the splint 1 503 and the splint 2 702, thereby reducing the wear of the splint 1 503 and the splint 2 702.

[0031] like Figure 8 and Fig.10As shown, the slide groove 705 is of curved design, there are multiple slide grooves 705, and the slide grooves 705 are arrayed on the surface of the gear plate 704. One side of the mounting block 903 and the extrusion plate 905 are both of inclined surface design, and the two inclined surfaces are parallel to each other.

[0032] The above scheme is adopted: through the design of the slide groove 705, since the slide groove 705 is a curved design, the connecting shaft 703 can move along the curved direction of the slide groove 705, and can drive the second splint 702 to move toward the surface of the pipe, and the number of the second splint 702 and the slide groove 705 is multiple, which can increase the limiting effect. Through the design of the mounting block 903 and the extrusion plate 905, since one side of the mounting block 903 and the extrusion plate 905 are both inclined designs and parallel to each other, the resistance between the extrusion plate 905 and the mounting block 903 can be reduced, making it convenient for the extrusion plate 905 to push the mounting block 903 to move.

[0033] like Figure 5 , Fig.10 and Fig.11 As shown, there is a gap between the gear ring 603 and the sliding shell 502, and the gear 1 601 and the gear ring 603 are on the same horizontal line. The top of the sliding block 803 and the top of the inner part of the limiting shell 805 are both arc-shaped, and the surface of the grinding wheel 904 is rough.

[0034] The above scheme is adopted: through the design of the toothed ring 603, since there is a gap between the toothed ring 603 and the sliding shell 502, when the sliding shell 502 moves, the toothed ring 603 will not interfere with the movement of the sliding shell 502, and the gear 1 601 and the toothed ring 603 are on the same horizontal line, which makes it convenient for the toothed ring 603 to drive the gear 1 601 to rotate. Through the design of the sliding block 803 and the limiting shell 805, since the top of the sliding block 803 and the top of the inner part of the limiting shell 805 are both arc-shaped designs, the pipe can be better clamped, and the surface of the grinding wheel 904 is rough, which can increase the friction with the sliding block 803 and the stability of the movement of the sliding block 803.

[0035] The working principle and use process of the present invention: First, the operator needs to insert the metal pipe to be straightened between the clamp plate 503 and the straightening roller 4, and then drive the motor 604 to make the gear 2 605 drive the gear ring 603 and the gear 1 601 to rotate, and the gear 1 601 will drive the rack 602, the sliding shell 502 and the surface of the clamp plate 503 pipe to move, and then use the resilience of the spring 506 to make the clamp plate 503 clamp the pipe, and then drive the two straightening rollers 4 to rotate at the same time, and in the process of rotation, the pipe will be straightened, and in the process of straightening, the pipe will rotate with it, and then bend. The curved pipe will rotate between the clamping plates 503. During the rotation process, the bending part of the pipe will push one of the clamping plates 503 to shrink into the sliding shell 502, and the spring 506 will continue to be compressed. Then the clamping plate 503 will squeeze the air inside the piston rod 504, and the air inside the piston rod 504 will enter the other piston rod 504 through the connecting hose 505. Then the piston rod 504 will push the corresponding clamping plate 503 to contact the surface of the pipe and limit the pipe to avoid a large rotation amplitude during the rotation of the pipe. Then the straightened pipe will be axially transported to between the second clamping plate 702 by the straightening roller 4, and then the second motor 706 can be driven to rotate the gear 3 707 and the toothed disc 704, and the connecting shaft 703 will slide along the bending direction of the slide groove 705, and then the connecting shaft 703 will drive the second clamping plate 702 to move toward the surface of the pipe, and then the second clamping plate 702 can limit the straightened pipe, and then the pipe will enter between the sliding block 803 and the limiting shell 805, and after all the pipes are discharged from the inside of the limiting mechanism 2 7, the second hydraulic cylinder 804 will instantly pull the limiting shell 805 down, and then fix the pipe, and use the weight of the pipe to squeeze the sliding block 803 to shrink to the installation shell Inside 801, when the sliding block 803 moves, the squeezing plate 905 will move downward, and the squeezing plate 905 and the mounting block 903 will squeeze and push the mounting block 903 to move toward the surface of the sliding block 803. When the mounting block 903 moves, the spring three 901 will be stretched, and then the mounting block 903 will push the grinding wheel 904 to contact the surface of the sliding block 803. Using the friction between the grinding wheel 904 and the sliding block 803, the grinding wheel 904 will rotate, thereby slowing down the moving speed of the sliding block 803, so that the sliding block 803 can steadily place the pipe on the surface of the conveyor roller, avoiding the pipe falling directly on the surface of the conveyor roller and causing damage to the surface of the pipe, and finally completing the operation process.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision two-roller tube straightening machine, comprising a fixed crossbeam (1), a hydraulic cylinder (2), and a movable crossbeam (3), characterized in that: Also included are: Straightening rollers (4) are respectively arranged on opposite sides of the fixed crossbeam (1) and the movable crossbeam (3); A limiting mechanism 1 (5), which is arranged on one side of the fixed crossbeam (1); The limiting mechanism (5) comprises a fixing block (501), the fixing block (501) is fixedly connected to one side of the fixed crossbeam (1), the fixing block (501) is internally slidably connected to a sliding shell (502), the sliding shell (502) is internally slidably connected to a clamping plate (503), a piston rod (504) is provided between the sliding shell (502) and the clamping plate (503), the number of the piston rods (504) is six, and each two are in a group, one side of the two piston rods (504) is connected via a connecting hose (505), and the clamping plate (503) is elastically connected to the sliding shell (502) via a spring (506); A driving assembly 1 (6) is arranged inside the fixing block 1 (501) and can drive the clamping plate 1 (503) to limit the position of the pipe.

2. The high-precision two-roller tube straightening machine according to claim 1 is characterized in that: The driving assembly 1 (6) comprises a gear 1 (601), wherein the gear 1 (601) is rotatably connected to the interior of a fixed block 1 (501), a rack (602) meshing with the gear 1 (601) is fixedly installed on one side of the sliding shell (502), a gear ring (603) meshing with the gear 1 (601) is rotatably connected to the interior of the fixed block 1 (501), a motor 1 (604) is fixedly installed on one side of the outer surface of the fixed block 1 (501), and a gear 2 (605) meshing with the gear ring (603) is fixedly installed on the output end of the motor 1 (604).

3. The high-precision two-roller tube straightening machine according to claim 1 is characterized in that: The invention also comprises: a second limiting mechanism (7) which is arranged on the other side of the fixed beam (1), the second limiting mechanism (7) comprising a second fixing block (701), the second fixing block (701) being fixedly connected to the other side of the fixed beam (1), the second fixing block (701) being internally slidably connected to a second clamping plate (702), the second fixing block (701) being internally rotatably connected to a toothed disc (704), the toothed disc (704) being internally provided with a sliding groove (705), a connecting shaft (703) located inside the sliding groove (705) being fixedly mounted on one side of the second clamping plate (702), a second motor (706) being fixedly mounted on one side of the outer surface of the second fixing block (701), and a third gear (707) meshing with the toothed disc (704) being fixedly mounted on the output end of the second motor (706).

4. The high-precision two-roller tube straightening machine according to claim 1 is characterized in that: A fixing mechanism (8) is arranged on the other side of the fixed crossbeam (1), the fixing mechanism (8) comprising a mounting shell (801), the mounting shell (801) being slidably connected to a sliding block (803) inside, the mounting shell (801) being elastically connected to the sliding block (803) via a second spring (802), a second hydraulic cylinder (804) being fixedly installed inside the sliding block (803), and an output shaft of the second hydraulic cylinder (804) being fixedly installed with a limiting shell (805) located inside the sliding block (803); The damping mechanism (9) is arranged inside the mounting shell (801) and can slow down the descending speed of the sliding block (803).

5. The high-precision two-roller tube straightening machine according to claim 4 is characterized in that: The damping mechanism (9) comprises a spring three (901), the spring three (901) being fixedly connected to the inside of the mounting shell (801), a fixing plate (902) being fixedly mounted on a side of the spring three (901) away from the sliding block (803), a mounting block (903) being fixedly mounted on the top of the fixing plate (902), a grinding wheel (904) being rotatably connected to a side of the mounting block (903) close to the sliding block (803), and extrusion plates (905) being fixedly mounted on both sides of the outer surface of the sliding block (803).

6. The high-precision two-roller tube straightening machine according to claim 1 is characterized in that: The insides of the first clamping plate (503) and the second clamping plate (702) are respectively connected in a rolling manner with balls (10), and the surfaces of the balls (10) can contact the surface of the pipe.

7. The high-precision two-roller tube straightening machine according to claim 3 is characterized in that: The slide groove (705) is of curved design, there are multiple slide grooves (705), and the slide grooves (705) are distributed in an array on the surface of the toothed disc (704).

8. The high-precision two-roller tube straightening machine according to claim 5, characterized in that: One side of the mounting block (903) and the extrusion plate (905) are both designed with inclined surfaces, and the two inclined surfaces are parallel to each other.

9. The high-precision two-roller tube straightening machine according to claim 2, characterized in that: A gap is provided between the gear ring (603) and the sliding housing (502), and the gear 1 (601) and the gear ring (603) are on the same horizontal line.

10. The high-precision two-roller tube straightening machine according to claim 4, characterized in that: The top of the sliding block (803) and the top of the interior of the limiting shell (805) are both arc-shaped, and the surface of the grinding wheel (904) is rough.

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