A device and method for preventing breakage of a thin-walled pipe during rolling of a pipe mill

Abstract

The application provides a device and method for preventing breakage of a thin-walled pipe rolled by a pipe mill, wherein the device comprises a base, a guide disc holder, a pushing assembly and an adjusting mechanism. Two groups of rollers are rotatably arranged on the base, and a rolling channel is formed between the two groups of rollers; the guide disc holder is slidably connected to the base; a guide disc is rotatably connected to the guide disc holder; the pushing assembly has a plurality of telescopic ends which can contact and push the guide disc holder; the adjusting mechanism has two adjusting ends which can move along a second direction respectively; before the thin-walled pipe enters the rolling channel, the target position of the guide disc holder is positioned by the two adjusting ends, and then the guide disc holder is pushed to contact the two adjusting ends by the pushing assembly, so as to reduce the distance between the guide disc and one group of rollers. The device for preventing breakage of a thin-walled pipe rolled by a pipe mill can solve the problem that the breakage of the pipe occurs due to the fact that the gap between the rollers and the guide disc is greater than the wall thickness of the pipe.

Description

Technical Field

[0001] This invention belongs to the field of hot-rolled seamless tube manufacturing technology, specifically relating to a device and method for preventing the end of thin-walled tubes from breaking during rolling. Background Technology

[0002] In the field of hot-rolled seamless tube manufacturing, the ACCU-ROLL tube rolling mill is an important component of the hot-rolled seamless tube production line. The ACCU-ROLL tube rolling mill is a precision skew rolling mill, forming a closed die through two horizontally arranged rolls, two vertically arranged active rotating guide discs, and a mandrel aligned with the rolling centerline. The ACCU-ROLL tube rolling mill features high wall thickness accuracy, a wide range of product specifications, compact equipment, low heat loss in the rolled product, and energy savings.

[0003] In existing technology, because the rolls of the tube rolling mill are tapered rolls, the roll surface angle gradually increases from the inlet to the outlet. The guide plate rotates parallel to the rolling line, and the gap between the guide plate and the rolls gradually increases from the inlet to the outlet. When producing products with a rough tube outer diameter to wall thickness ratio ≥40, this specification is the limit production specification of the ACCU-ROLL tube rolling mill. The guide plate is located between two rolls, and there is a gap between the end face of the guide plate and the corresponding roll. Because the gap between the roll and the guide plate is greater than the wall thickness of the rough tube, the rough tube enters the gap between the roll and the guide plate, resulting in a rolling tail break (the guide plate will cut the rough tube). The rough tube with a tail break gets stuck at the mill exit table and cannot smoothly enter the next process, becoming intermediate scrap. Although a smaller rough tube with a tail break can enter the next process for sizing normally, the tail break part cannot meet the product quality requirements and needs to be cut off, resulting in a large amount of cutting loss, which leads to a decrease in the rolling yield and an increase in rolling costs. Summary of the Invention

[0004] This invention provides a device to prevent the end of thin-walled tubes from breaking during rolling mill production, aiming to solve the problem in the prior art where the gap between the rolls and the guide plate is greater than the wall thickness of the raw tube, leading to the end of the raw tube breaking.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a device and method for preventing the end-of-roller of thin-walled tubes from breaking during rolling, comprising:

[0006] A base; two sets of rollers are rotatably mounted on the base, and a rolling channel is formed between the two sets of rollers; the length direction of the rolling channel is defined as a first direction, and the horizontal direction perpendicular to the first direction is defined as a second direction;

[0007] A guide plate frame is arranged along the first direction and is slidably connected to the base in the horizontal direction; a guide plate is rotatably connected to the guide plate frame;

[0008] The push assembly, located on one side of the guide plate frame along the second direction, has multiple telescopic ends that can contact the guide plate frame and push the guide plate frame;

[0009] An adjustment mechanism is located on the other side of the guide plate along the second direction; the adjustment mechanism has two adjustment ends that can move separately along the second direction, and each adjustment end is spaced apart along the first direction;

[0010] Before the thin-walled tube enters the rolling channel, the adjustment mechanism positions the guide plate frame at the target position through the two adjustment ends, and then pushes the guide plate frame to contact the two adjustment ends through the push assembly to reduce the distance between the guide plate and one of the sets of rolls.

[0011] In one possible implementation, the adjustment mechanism includes:

[0012] Mounting rack;

[0013] A first adjusting screw is provided along the second direction. The first adjusting screw has an abutting end that contacts the guide plate frame. The first adjusting screw is threadedly connected to the mounting frame.

[0014] The second adjusting screw is arranged along the second direction. The second adjusting screw has an abutting end that contacts the guide plate frame. The second adjusting screw is threadedly connected to the mounting frame. The second adjusting screw and the first adjusting screw are spaced apart along the first direction.

[0015] A drive assembly is disposed on the base, and the drive assembly is connected to both the first adjusting lead screw and the second adjusting lead screw, for driving the first adjusting lead screw and the second adjusting lead screw to move.

[0016] In one possible implementation, the mounting bracket includes:

[0017] Frame;

[0018] The first connecting block is rotatably mounted on the frame and is threadedly connected to the first adjusting screw.

[0019] The second connecting block is rotatably mounted on the frame and is threadedly connected to the second adjusting screw.

[0020] Two guide blocks are provided, and the two guide blocks are slidably disposed on the frame along the second direction. The two guide blocks are respectively rotatably connected to the first adjusting screw and the second adjusting screw.

[0021] The two guide blocks are located at the ends of the first and second adjusting screws away from the guide plate frame, respectively.

[0022] In one possible implementation, the driving component includes:

[0023] A driver, mounted on the base, has a first power output end and a second power output end, the first power output end having a first gear;

[0024] A first transmission rod is arranged along the second direction. A second gear and a third gear are respectively provided at both ends of the first transmission rod. The second gear meshes with the first gear for transmission, and the third gear meshes with the first connecting block for transmission. A clutch is provided on the first transmission rod.

[0025] The second transmission rod is arranged along the first direction. One end of the second transmission rod is connected to the second power output end, and the other end has a fourth gear.

[0026] The third transmission rod is arranged along the second direction. The two ends of the third transmission rod are respectively provided with a fifth gear and a sixth gear. The fifth gear meshes with the fourth gear and the sixth gear meshes with the second connecting block.

[0027] In one possible implementation, the first connecting block is provided with a first threaded hole adapted to the first adjusting screw, and the first connecting block is provided with a first annular tooth surface structure that meshes with the third gear.

[0028] In one possible implementation, the second connecting block is provided with a second threaded hole adapted to the second adjusting screw, and the second connecting block is provided with a second annular tooth surface structure that meshes with the sixth gear.

[0029] In one possible implementation, the jacking assembly includes at least two hydraulic cylinders, with the fixed end of each hydraulic cylinder connected to the base and the telescopic end of each hydraulic cylinder abutting against the guide plate frame.

[0030] Another object of the present invention is to provide a method for preventing the tail of a thin-walled tube from breaking during rolling in a tube rolling mill, including the above-mentioned device for preventing the tail of a thin-walled tube from breaking during rolling in a tube rolling mill. The method for preventing the tail of a thin-walled tube from breaking during rolling in a tube rolling mill includes:

[0031] S10. According to the specifications of the rough tube rolled by the tube rolling mill, install the corresponding guide plate on the guide plate frame. The line connecting the center points of the guide plate outlet and inlet should coincide with or be parallel to the rolling line.

[0032] S20. Disengage the clutch, adjust the distance from the second adjusting screw to the guide plate frame, and push the guide plate frame through the push assembly to tilt the guide plate frame and the guide plate. The outlet end of the gap between the steel-facing side of the guide plate and one of the sets of rolls is reduced, while the inlet end is increased.

[0033] S30. Engage the clutch, simultaneously adjust the distance between the first adjusting screw and the second adjusting screw and the guide plate frame, and then push the guide plate frame through the push assembly to reduce the gap between the guide plate frame and the guide plate and one of the sets of rollers; then adjust the gap between the other set of rollers and the guide plate frame and the guide plate.

[0034] S40, the round billets used for rough tube specifications are heated and pierced in a ring furnace to form rough tubes;

[0035] S50: Using the rolling mill obtained from S30, the tube is rolled to produce a rough tube with an outer diameter to wall thickness ratio ≥ 40.

[0036] In one possible implementation, the ratio of the guide disc diameter to the roll diameter should be ≥2.1:1.

[0037] In one possible implementation, the minimum gap between the guide plate and the roll in step S30 is ≤1mm.

[0038] The beneficial effects of the device for preventing the end-of-tube rolling mill from breaking during thin-walled tube rolling provided by this invention are as follows: Compared with the prior art, two sets of rollers are rotatably arranged on the base, forming a rolling channel between the two sets of rollers. A guide plate is rotatably connected to the guide plate frame, and the guide plate frame is slidably connected to the base in the horizontal direction, so that the guide plate moves with the guide plate frame during the sliding process. A pushing assembly along the second direction is located on one side of the guide plate frame, and an adjusting mechanism is located on the other side of the guide plate frame. The pushing assembly has multiple telescopic ends, each of which can contact the guide plate frame and push the guide plate frame to move. The adjusting mechanism has two adjusting ends that can move separately along the second direction, and the two adjusting ends are spaced apart along the first direction, so that when only one adjusting end moves, the pushing assembly then moves the guide plate frame to contact the two adjusting ends, thus completing the angle adjustment of the guide plate frame. When the two adjusting ends move simultaneously, the guide plate is then moved to contact the two adjusting ends by the push assembly. At this point, the guide plate moves horizontally, reducing the distance between the guide plate and one of the sets of rolls, thereby reducing damage to the thin-walled tube, ensuring the rolling quality of the thin-walled tube, improving the rolling yield, and making it highly practical. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of a device for preventing the end of a thin-walled tube from breaking during rolling, provided by an embodiment of the present invention.

[0040] Figure 2 A schematic diagram illustrating the cooperation of the guide plate, guide plate frame, pushing assembly, and adjusting mechanism of a device for preventing the end-of-tube rolling mill from breaking during thin-walled tube rolling, provided in an embodiment of the present invention. Figure 1 ;

[0041] Figure 3 A schematic diagram of the guide plate and adjustment mechanism of a device for preventing the end of thin-walled tubes rolled by a tube rolling mill, provided in an embodiment of the present invention;

[0042] Figure 4 A schematic diagram of the base and rolls of a device for preventing the end of a thin-walled tube from breaking during rolling in an embodiment of the present invention;

[0043] Figure 5 A flowchart illustrating a method for preventing the end of a thin-walled tube during rolling in an embodiment of the present invention.

[0044] Explanation of reference numerals in the attached figures:

[0045] 10. Base; 11. Roll; 20. Guide plate frame; 21. Guide plate; 30. Pushing assembly; 31. Hydraulic cylinder; 40. Adjusting mechanism; 41. First adjusting screw; 42. Second adjusting screw; 43. Drive assembly; 431. Driver; 432. First transmission rod; 433. Second transmission rod; 434. Third transmission rod; 435. Clutch. Detailed Implementation

[0046] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0047] It should be noted that the terms "length", "width", "height", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", and "tail" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0048] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Additionally, "multiple" and "several" mean two or more, unless otherwise explicitly specified.

[0050] Please refer to the following: Figures 1 to 5 This invention provides a device and method for preventing the tail of a thin-walled tube from breaking during rolling. The device includes a base 10, a guide frame 20, a pushing assembly 30, and an adjusting mechanism 40. Two sets of rollers 11 are rotatably mounted on the base 10, forming a rolling channel between them. The length direction of the rolling channel is defined as a first direction, and the horizontal direction perpendicular to the first direction is defined as a second direction. The guide frame 20 is positioned along the first direction and is slidably connected to the base 10 in the horizontal direction. A guide plate 21 is rotatably connected to the guide frame 20. The pushing assembly 30 is located on one side of the guide frame 20 along the second direction and has multiple telescopic ends that can contact and push the guide frame 20. The adjusting mechanism 40 is located on the other side of the guide frame 20 along the second direction. The adjusting mechanism 40 has two adjusting ends that can move separately along the second direction, and these adjusting ends are spaced apart along the first direction. Before the thin-walled tube enters the rolling channel, the adjustment mechanism 40 positions the guide plate 20 at the target position through two adjustment ends, and then pushes the guide plate 20 to contact the two adjustment ends through the push assembly 30 to reduce the distance between the guide plate 21 and one of the sets of rolls 11.

[0051] In this embodiment, two sets of rollers 11 are rotatably mounted on the base 10, forming a rolling channel between the two sets of rollers 11. A guide plate frame 20 is arranged along a first direction and is slidably connected to the base 10 in the horizontal direction. A guide plate 21 is rotatably connected to the guide plate frame 20. A pushing assembly 30 along a second direction is located on one side of the guide plate frame 20. The pushing assembly 30 has multiple telescopic ends, each of which can contact the guide plate frame 20 and push the guide plate frame 20 to move. An adjusting mechanism 40 along the second direction is located on the other side of the guide plate frame 20. The adjusting mechanism 40 has two adjusting ends, which can move along the second direction respectively. The two adjusting ends are spaced apart along the first direction. Before the thin-walled tube enters the rolling channel, the target position of the guide plate frame 20 is positioned by the two adjusting ends of the adjusting mechanism 40. Then, the pushing assembly 30 moves the guide plate frame 20 to contact the two adjusting ends, thereby reducing the distance between the guide plate 21 and one of the sets of rollers 11.

[0052] It should be noted that after the distance between the guide plate 21 and one set of rolls 11 is adjusted, the position of the other set of rolls 11 is then adjusted so that a rolling channel is formed between the two sets of rolls 11.

[0053] This invention provides a device for preventing the end-of-tube rolling mill from breaking during thin-walled tube rolling. Compared with the prior art, two sets of rollers 11 are rotatably mounted on a base 10, forming a rolling channel between the two sets of rollers 11. A guide plate 21 is rotatably connected to a guide plate frame 20, and the guide plate frame 20 is slidably connected to the base 10 in the horizontal direction, so that the guide plate 21 moves with the guide plate frame 20 during its sliding process. A pushing assembly 30 along the second direction is located on one side of the guide plate frame 20, and an adjusting mechanism 40 is located on the other side of the guide plate frame 20. The pushing assembly 30 has multiple telescopic ends, each of which can contact the guide plate frame 20 and push the guide plate frame 20 to move. The adjusting mechanism 40 has two adjusting ends that can move separately along the second direction, and the two adjusting ends are spaced apart along the first direction, so that when only one adjusting end moves, the pushing assembly 30 then moves the guide plate frame 20 to contact the two adjusting ends, thus completing the angle adjustment of the guide plate frame 20. When the two adjusting ends move simultaneously, the guide plate 20 is then moved to contact the two adjusting ends by the push assembly 30. At this time, the guide plate 20 is moved in the horizontal direction, reducing the distance between the guide plate 20 and one of the sets of rolls 11, thereby reducing the damage to the thin-walled tube, ensuring the rolling quality of the thin-walled tube, improving the rolling yield, and making it practical.

[0054] Furthermore, there are gaps between the guide plate 21 and both sets of rolls 11. The guide plate 21 has a steel-facing side and a steel-discharging side. Adjusting the gap between the guide plate 21 and the rolls 11 mainly adjusts the gap between the steel-facing side of the guide plate 21 and one set of rolls 11. The gap between the steel-discharging side of the guide plate 21 and the other set of rolls 11 has no impact on production and is not controlled. Since the rolls 11 are tapered rolls, there will be an angle between the guide plate 21 and the two sets of rolls 11. When adjusting the gap between the guide plate 21 and the rolls 11, it is necessary to first adjust the angle between the guide plate 21 and the rolls 11, and then adjust the distance between them.

[0055] In some embodiments, please refer to Figures 1 to 3 The adjustment mechanism 40 includes a mounting frame, a first adjusting screw 41, a second adjusting screw 42, and a drive assembly 43. The first adjusting screw 41 is arranged along a second direction and has an abutment end that contacts the guide plate frame 20. The first adjusting screw 41 is threadedly connected to the mounting frame. The second adjusting screw 42 is also arranged along a second direction and has an abutment end that contacts the guide plate frame 20. The second adjusting screw 42 is threadedly connected to the mounting frame, and the second adjusting screw 42 is spaced apart from the first adjusting screw 41 along a first direction. The drive assembly 43 is mounted on the base 10 and is connected to both the first adjusting screw 41 and the second adjusting screw 42. The drive assembly 43 is used to drive the first adjusting screw 41 and the second adjusting screw 42 to move. In this embodiment, both the first adjusting screw 41 and the second adjusting screw 42 are arranged along the second direction. Both are threadedly connected to the mounting bracket, and the drive assembly 43 is connected to both. Thus, the drive assembly 43 drives the first adjusting screw 41 and the second adjusting screw 42 to move. Both the first adjusting screw 41 and the second adjusting screw 42 have a contact end that contacts the guide plate 21. The position of the contact end of the first adjusting screw 41 and the second adjusting screw 42 is adjusted by the drive assembly 43 to locate the target position of the guide plate frame 20, making operation convenient.

[0056] In some embodiments, the mounting bracket includes a frame, a first connecting block, a second connecting block, and a guide block. The first connecting block is rotatably mounted on the frame and is threadedly connected to a first adjusting screw 41. The second connecting block is rotatably mounted on the frame and is threadedly connected to a second adjusting screw 42. Two guide blocks are provided, mounted on the frame, and rotatably connected to the first adjusting screw 41 and the second adjusting screw 42, respectively. The two guide blocks are located at the ends of the first adjusting screw 41 and the second adjusting screw 42 furthest from the guide plate frame 20. In this embodiment, the first connecting block is rotatably mounted on the frame and threadedly connected to the first adjusting screw 41. The first adjusting screw 41 is rotatably connected to one of the guide blocks, thereby enabling the first adjusting screw 41 to move along a second direction. Similarly, the second connecting block is rotatably mounted on the frame and threadedly connected to the second adjusting screw 42. The second adjusting screw 42 is rotatably connected to the other guide block, thereby enabling the second adjusting screw 42 to move along a second direction. The distance between the guide plate frame 20 and the guide plate frame 20 is adjusted by moving the first adjusting screw 41 and the second adjusting screw 42, thereby achieving the positioning of the guide plate frame 20. That is, when the first adjusting screw 41 and the second adjusting screw 42 reach the target position, the guide plate frame 20 is pushed to the target position by the pushing assembly 30.

[0057] Specifically, the first adjusting screw 41 and the second adjusting screw 42 can be connected to the guide block via bearings.

[0058] In some embodiments, please refer to Figures 1 to 3The drive assembly 43 includes a driver 431, a first transmission rod 432, a second transmission rod 433, and a third transmission rod 434. The driver 431 is mounted on the base 10 and has a first power output end and a second power output end. The first power output end has a first gear. The first transmission rod 432 is arranged along a second direction, and its two ends are respectively provided with a second gear and a third gear. The second gear meshes with the first gear for transmission, and the third gear meshes with a first connecting block for transmission. A clutch 435 is provided on the first transmission rod 432. The second transmission rod 433 is arranged along a first direction, with one end connected to the second power output end and the other end having a fourth gear. The third transmission rod 434 is arranged along the second direction, and its two ends are respectively provided with a fifth gear and a sixth gear. The fifth gear meshes with the fourth gear for transmission, and the sixth gear meshes with a second connecting block for transmission. In this embodiment, the driver 431 has a first power output end and a second power output end, and the first power output end has a first gear. The first transmission rod 432 is arranged along the second direction. A second gear and a third gear are respectively provided at both ends of the first transmission rod 432. The second gear meshes with the first gear, thereby driving the first transmission rod 432 to rotate. Simultaneously, the third gear meshes with the first connecting block, thereby driving the first connecting block to rotate. The second transmission rod 433 is arranged along the first direction and is connected to the second power output end. A fourth gear is provided at the other end. The third transmission rod 434 is arranged along the second direction. A fifth gear and a sixth gear are respectively provided at both ends of the third transmission rod 434. The fifth gear meshes with the fourth gear, thereby driving the second transmission rod 433 to rotate, and the second transmission rod 433 drives the third transmission rod 434 to rotate. The sixth gear meshes with the second connecting block, thereby driving the second connecting block to rotate.

[0059] Furthermore, a clutch 435 is provided on the first transmission rod 432. When adjusting the angle between the guide plate 21 and the roll 11, the first transmission rod 432 is locked by the clutch 435. The distance between the second adjusting screw 42 and the guide plate frame 20 is adjusted by the third transmission rod 434. Then, the push assembly 30 pushes the guide plate frame 20 to abut against both the first adjusting screw 41 and the second adjusting screw 42. After the angle is adjusted, the clutch 435 is released from locking the first transmission rod 432. The first transmission rod 432 and the third transmission rod 434 adjust the distance between the first adjusting screw 41 and the second adjusting screw 42 respectively. Then, the push assembly 30 pushes the guide plate frame 20 to abut against both the first adjusting screw 41 and the second adjusting screw 42, thereby completing the adjustment of the position of the guide plate frame 20 and realizing the adjustment of the angle and gap between the guide plate 21 and the roll 11.

[0060] In the above embodiments, the first connecting block is provided with a first threaded hole adapted to the first adjusting screw 41, and the first connecting block is provided with a first annular tooth surface structure that meshes with the third gear. Specifically, the first annular tooth surface structure surrounds the outer periphery of the first connecting block. In this embodiment, the first connecting block is provided with a first annular tooth surface structure, which meshes with the third gear, thereby enabling the first transmission rod 432 to drive the first connecting block to rotate, and the first adjusting screw 41 to be threadedly connected to the first connecting block, thereby the first connecting block drives the first adjusting screw 41 to move along the second direction.

[0061] In the above embodiment, the second connecting block is provided with a second threaded hole adapted to the second adjusting screw 42, and the second connecting block is provided with a second annular tooth surface structure that meshes with the sixth gear. Specifically, the second annular tooth surface structure surrounds the outer periphery of the second connecting block. In this embodiment, the second connecting block is provided with a second annular tooth surface structure, which meshes with the sixth gear, thereby enabling the third transmission rod 434 to drive the second connecting block to rotate, and the second adjusting screw 42 to be threadedly connected to the second connecting block, thereby the second connecting block drives the second adjusting screw 42 to move along the second direction.

[0062] In some embodiments, please refer to Figure 2 The jacking assembly 30 includes at least two hydraulic cylinders 31. The fixed end of each hydraulic cylinder 31 is connected to the base 10, and the telescopic end of each hydraulic cylinder 31 abuts against the guide plate frame 20. In this embodiment, at least two hydraulic cylinders 31 are provided, and each hydraulic cylinder 31 is spaced apart along a first direction. The telescopic end of each hydraulic cylinder 31 abuts against the guide plate frame 20, thereby pushing the guide plate frame 20 to move through each hydraulic cylinder 31.

[0063] Based on the same inventive concept, this application also provides a method for preventing the tail of a thin-walled tube from breaking during rolling, including the aforementioned device for preventing the tail of a thin-walled tube from breaking during rolling. A method for preventing the tail of a thin-walled tube from breaking during rolling includes:

[0064] S10. According to the specifications of the rolled tube of the rolling mill, install the corresponding guide plate 21 on the guide plate frame 20. The line connecting the center point of the outlet and inlet of the guide plate 21 should coincide with or be parallel to the rolling line.

[0065] S20. Lock the first transmission rod 432 through the clutch 435, adjust the distance between the second adjusting screw 42 and the guide plate frame 20, push the guide plate frame 20 through the push assembly 30, so that the guide plate frame 20 and the guide plate 21 are tilted, the outlet end of the gap between the steel-facing side of the guide plate 21 and one of the sets of rolls 11 is reduced, and the inlet end is increased at the same time.

[0066] S30, release the clutch 435 from locking the first transmission rod 432, and simultaneously adjust the distance between the first adjusting screw 41 and the second adjusting screw 42 and the guide plate frame 20. Then, push the guide plate frame 20 through the push assembly 30 to reduce the gap between the guide plate frame 20 and the guide plate 21 and one of the sets of rollers 11. Then adjust the gap between the other set of rollers 11 and the guide plate frame 20 and the guide plate 21.

[0067] S40, the round billets used for rough tube specifications are heated and pierced in a ring furnace to form rough tubes;

[0068] S50: Using the rolling mill obtained from S30, the tube is rolled to produce a rough tube with an outer diameter to wall thickness ratio ≥ 40.

[0069] In this embodiment, according to the specifications of the rolled tube, the corresponding guide plate 21 is installed on the guide plate frame 20. The line connecting the center points of the guide plate 21's outlet and inlet should coincide with or be parallel to the rolling line. Since the rolls 11 are tapered rolls, there will be an angle between the guide plate 21 and the two sets of rolls 11. When adjusting the gap between the guide plate 21 and the rolls 11, it is necessary to first adjust the angle between the guide plate 21 and the rolls 11, and then adjust the distance between them. There is a gap between the guide plate 21 and the two sets of rolls 11. The guide plate 21 has a steel-facing side and a steel-discharging side. Adjusting the gap between the guide plate 21 and the rolls 11 mainly involves adjusting the gap between the steel-facing side of the guide plate and one of the sets of rolls 11. When adjusting the angle between the guide plate 21 and the roll 11, the first transmission rod 432 is locked by the clutch 435, and the distance between the second adjusting screw 42 and the guide plate frame 20 is adjusted by the third transmission rod 434. Then, the pushing assembly 30 pushes the guide plate frame 20 to abut against both the first adjusting screw 41 and the second adjusting screw 42. After the angle is adjusted, the clutch 435 is released from locking the first transmission rod 432. The first transmission rod 432 and the third transmission rod 434 adjust the distance between the first adjusting screw 41 and the second adjusting screw 42 respectively. Then, the pushing assembly 30 pushes the guide plate frame 20 to abut against both the first adjusting screw 41 and the second adjusting screw 42, thereby completing the adjustment of the position of the guide plate frame 20 and realizing the adjustment of the angle and gap between the guide plate 21 and the roll 11. The round billet used for the rough tube specification product is heated and pierced in a ring furnace to form a rough tube. Then, the rough tube is rolled using an adjusted rolling mill to obtain a rough tube with an outer diameter to wall thickness ratio ≥40. The gap between the guide plate on the steel-facing side and the rolling roll 11 is reduced, thereby reducing tail breakage and improving the production quality of the rough tube.

[0070] Specifically, the guide disc 21 is a large, disc-shaped guiding device, typically installed between stands or at specific locations in a continuous rolling mill. Its core function is to provide precise guidance and support for the tube during the rolling process, ensuring that the tube smoothly and accurately enters the next stand according to the set path and posture. The guide disc 21 guides the front end of the tube, aligning its centerline with the centerline of the rolling mill, ensuring the tube smoothly bites into the next roll 11 and preventing accidents such as collisions with the stand or scratches on the tube surface. In this application, the guide disc 21 includes an upper guide disc body and a lower guide disc body, which together complete the conveying of the tube.

[0071] In some embodiments, the ratio of the guide disc diameter to the roll diameter should be ≥2.1:1. The linear velocity ratio of the guide disc 21 to the roll 11 is 2.2:1.

[0072] In some embodiments, the ratio of the distance between the upper and lower guide disc bodies to the roll gap, i.e., the ellipticity of the roll pass, is 1.08, and the roll feed angle is 6.5 degrees. The wall thickness of the tube should be 4-7 mm thicker than the wall thickness of the rough tube after rolling, and the outer diameter of the tube should be the same as or ≤ 6 mm different from the outer diameter of the rough tube after rolling. Specifically, the tube is a thin-walled tube.

[0073] 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 within the protection scope of the present invention.

Claims

1. A method for preventing breakage of a thin-walled pipe during rolling of a pipe mill based on an apparatus for preventing breakage of a thin-walled pipe during rolling of a pipe mill, characterized by, The device for preventing the rolling thin-wall pipe from breaking in the pipe rolling mill comprises: a base, two groups of rolling mills rotating on the base, a rolling channel formed between the two groups of rolling mills, a first direction being the length direction of the rolling channel, and a second direction being the horizontal direction perpendicular to the first direction; a guide disc holder arranged along the first direction and slidingly connected with the base in the horizontal direction, and a guide disc rotatingly connected with the guide disc holder; a pushing assembly arranged along the second direction on one side of the guide disc holder and having a plurality of telescopic ends capable of contacting and pushing the guide disc holder; an adjusting mechanism arranged along the second direction on the other side of the guide disc holder, the adjusting mechanism having two adjusting ends capable of moving along the second direction respectively, and each adjusting end being arranged along the first direction; wherein, before the thin-wall pipe enters the rolling channel, the adjusting mechanism positions the target position of the guide disc holder through the two adjusting ends, and then pushes the guide disc holder to contact the two adjusting ends through the pushing assembly to reduce the distance between the guide disc and one group of rolling mills; the adjusting mechanism comprises a mounting frame, a first adjusting screw, a second adjusting screw and a driving assembly; the driving assembly comprises a driver, a first transmission rod, a second transmission rod and a third transmission rod, and the first transmission rod is provided with a clutch; the method for preventing the rolling thin-wall pipe from breaking in the pipe rolling mill comprises: S10, according to the rolling pipe specification, the corresponding guide disc is installed on the guide disc holder, and the center line of the outlet and the inlet of the guide disc should coincide with or be parallel to the rolling line; S20, the clutch is disconnected, the distance between the second adjusting screw and the guide disc holder is adjusted, the guide disc holder is pushed through the pushing assembly, the guide disc holder and the guide disc are inclined, the outlet end of the gap between the steel meeting side of the guide disc and one group of rolling mills is reduced, and the inlet end is increased; S30, the clutch is connected, the distance between the first adjusting screw, the second adjusting screw and the guide disc holder is adjusted, the guide disc holder is pushed through the pushing assembly, the gap between the guide disc holder, the guide disc and one group of rolling mills is reduced, and the gap between the other group of rolling mills and the guide disc holder and the guide disc is adjusted; S40, the round billet for the pipe specification product is heated in the annular furnace and perforated to form a rough pipe; S50, the rough pipe is rolled by using the rolling mill obtained in S30 to obtain the pipe with the ratio of the outer diameter to the wall thickness being greater than or equal to 40.

2. A method of preventing breakage of thin-walled pipe being rolled by a pipe rolling mill as defined in claim 1, wherein The first adjusting screw is arranged along the second direction, the first adjusting screw has an abutting end contacting with the guide disc holder, and the first adjusting screw is threadedly connected with the mounting frame; the second adjusting screw is arranged along the second direction, the second adjusting screw has an abutting end contacting with the guide disc holder, the second adjusting screw is threadedly connected with the mounting frame, and the second adjusting screw is arranged along the first direction away from the first adjusting screw. The driving assembly is arranged on the base and connected with the first adjusting screw rod and the second adjusting screw rod, and is used for driving the first adjusting screw rod and the second adjusting screw rod to move.

3. A method of preventing breakage of thin-walled pipe being rolled by a pipe mill as defined in claim 2, characterized in that, The mounting frame comprises: a frame body; a first connecting block rotatably arranged on the frame body and in threaded transmission connection with the first adjusting screw rod; a second connecting block rotatably arranged on the frame body and in threaded transmission connection with the second adjusting screw rod; two guide blocks arranged on the frame body in sliding connection in the second direction and respectively rotatably connected with the first adjusting screw rod and the second adjusting screw rod; wherein the two guide blocks are respectively located at one end of the first adjusting screw rod and the second adjusting screw rod away from the guide disc frame.

4. A method of preventing breakage of thin-walled pipe being rolled by a pipe rolling mill as defined in claim 3, wherein The driver is arranged on the base and has a first power output end and a second power output end, and the first power output end has a first gear; the first transmission rod is arranged in the second direction, and two ends of the first transmission rod are respectively provided with a second gear and a third gear, the second gear is in meshing transmission with the first gear, and the third gear is in meshing transmission with the first connecting block; the second transmission rod is arranged in the first direction, one end of the second transmission rod is connected with the second power output end, and the other end has a fourth gear; the third transmission rod is arranged in the second direction, and two ends of the third transmission rod are respectively provided with a fifth gear and a sixth gear, the fifth gear is in meshing transmission with the fourth gear, and the sixth gear is in meshing transmission with the second connecting block.

5. A method of preventing breakage of thin-walled pipe being rolled by a pipe rolling mill as defined in claim 4, wherein The first connecting block is provided with a first threaded hole matched with the first adjusting screw rod, and the first connecting block is provided with a first annular tooth surface structure meshing with the third gear.

6. A method of preventing breakage of thin-walled pipe being rolled by a pipe rolling mill as defined in claim 4, wherein The second connecting block is provided with a second threaded hole matched with the second adjusting screw rod, and the second connecting block is provided with a second annular tooth surface structure meshing with the sixth gear.

7. A method of preventing breakage of thin-walled pipe being rolled by a pipe mill as defined in claim 4, wherein The pushing assembly comprises at least two hydraulic cylinders, the fixed end of each hydraulic cylinder is connected with the base, and the telescopic end of each hydraulic cylinder is in abutment with the guide disc frame.

8. A method of preventing breakage of thin-walled pipe being rolled by a pipe mill as defined in claim 1, wherein The ratio of the diameter of the guide disc to the diameter of the roller should be ≥2.1:

1.

9. A method of preventing breakage of thin-walled pipe being rolled by a pipe mill as defined in claim 1, wherein The minimum gap between the guide disc and the roller in the S30 step is ≤1mm.

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