A centering device and method for universal mill rail guides

Abstract

The application discloses a centering device for a universal rolling mill rail guide, comprising a positioning base frame, a base frame positioning mechanism and a guide positioning mechanism, wherein the positioning base frame comprises an inverted U-shaped plate and a reference plate, the inverted U-shaped plate is astride on the lower horizontal roller of the universal rolling mill and closely contacts with the top and both sides of the horizontal roller, and the reference plate is horizontally fixed on the top of the inverted U-shaped plate; the base frame positioning mechanism is installed on the positioning base frame to level and lock the positioning base frame; the guide positioning mechanism comprises a plurality of laser emitters installed on the positioning base frame, and the laser beams emitted by the laser emitters are used as the reference lines for determining the position of the universal rolling mill rail guide. The application also provides a centering method, wherein the positioning base frame is used as the reference component, and the laser beams emitted by the laser emitters are used as the reference lines for determining the position of the guide, so that the installation and adjustment difficulty of the guide is greatly reduced, the line installation precision and efficiency of the guide are effectively improved, and the smooth rolling production of the rail is ensured.

Description

Technical Field

[0001] This invention relates to a device and method for assisting in the alignment of rail guides in a universal rolling mill, belonging to the field of metallurgical equipment technology. Background Technology

[0002] When rolling steel rails using a universal rolling mill, guide devices must be installed on the inlet and outlet sides of the horizontal rolls to guide the workpiece smoothly into and out of the roll pass. However, because all parts of the roll pass profile are connected by arcs (such as...), Figure 1 and Figure 2 As shown in the figure, during the installation and adjustment of the guide device, a suitable point, line or surface could not be found as a reference for the installation and adjustment of the guide.

[0003] from Figure 1 and Figure 2 It can be seen that during the installation and adjustment of the horizontal roll guide device in a universal rolling mill, the workers cannot precisely control its position and levelness, and can only make adjustments through visual inspection and experience. Therefore, the installation accuracy of the guide is greatly affected by human factors (such as the experience, cognition, and adjustment control ability of different workers), resulting in significant differences and fluctuations. Moreover, these differences and fluctuations continue to change with the influence of external factors such as time and environment. The repeatability and reproducibility of the centering installation of the universal rolling mill guide device are difficult to guarantee effectively, leading to frequent rolling quality problems and shutdowns for adjustment during the operation of the roll system. Therefore, it is essential to design a centering device for the universal rolling mill rail guide. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a centering device and method for a universal rolling mill rail guide, thereby improving the installation accuracy of the rail guide device and ensuring the smooth progress of rail rolling production.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A centering device for a universal rolling mill rail guide includes a positioning base frame, a base frame positioning mechanism, and a guide positioning mechanism. The positioning base frame includes an inverted U-shaped plate and a reference plate. The inverted U-shaped plate straddles the lower horizontal roll of the universal rolling mill and is tightly fitted to the top and sides of the horizontal roll. The reference plate is horizontally fixed to the top of the inverted U-shaped plate. The base frame positioning mechanism is installed on the positioning base frame to level and lock the positioning base frame. The guide positioning mechanism includes multiple laser emitters installed on the positioning base frame, and the laser beams emitted by them serve as a reference line for determining the position of the universal rolling mill rail guide.

[0006] The above-mentioned centering device for the rail guide of the universal rolling mill includes a guide positioning mechanism comprising a first laser emitter and a second laser emitter. A horizontal positioning hole is provided on the reference plate. The horizontal positioning hole is located on the neutral line of the horizontal roll of the universal rolling mill. The first laser emitter and the second laser emitter are coaxially mounted in the horizontal positioning hole, and their irradiation directions are respectively facing the exit side and the entrance side of the universal rolling mill. The horizontal laser beams emitted by the two are respectively located above the upper surface of the exit guide and the entrance guide of the universal rolling mill.

[0007] The alignment device for the rail guide of the aforementioned universal rolling mill includes a third laser emitter, a fourth laser emitter, a fifth laser emitter, and a sixth laser emitter. A rail head side positioning hole and a rail bottom side positioning hole, parallel to the horizontal positioning hole, are respectively provided on the lower sides of the inverted U-shaped plate. The rail head side positioning hole is located at the widest point of the rail head side hole of the inverted U-shaped plate, and the rail bottom side positioning hole is located at the widest point of the rail bottom side hole of the inverted U-shaped plate. The third and fourth laser emitters are coaxially installed in the rail bottom side positioning hole, and their irradiation directions are respectively towards the exit side and the entrance side of the universal rolling mill. The fifth and sixth laser emitters are coaxially installed in the rail head side positioning hole, and their irradiation directions are respectively towards the exit side and the entrance side of the universal rolling mill.

[0008] The aforementioned centering device for the universal rolling mill rail guide includes a base frame positioning mechanism comprising a level indicator and a level adjuster. The level indicator comprises a gravity pointer and a rotating shaft. The upper end of the gravity pointer is rotatably connected to the outer side of the inverted U-shaped plate via the rotating shaft, and the lower end of the gravity pointer corresponds to the scale line on the outer side of the lower end of the inverted U-shaped plate. The level adjuster comprises four leveling bolts and four nuts. The four nuts are welded and fixed to the reference plate. The four leveling bolts are screwed into the four nuts respectively and pass through the bolt holes on the reference plate before contacting the horizontal roll.

[0009] The aforementioned centering device for the universal rolling mill rail guide includes a magnetic locker in its base frame positioning mechanism. The magnetic locker comprises a permanent magnet, a slider, a frame, a pull rod, a limiting plate, a handle, and an elastic positioning piece. A slider through-hole matching the slider is provided on the reference plate. The frame is welded to the reference plate and located above the slider through-hole. A vertical slide rail matching the slider is provided inside the frame. The slider is slidably installed in the vertical slide rail and the slider through-hole. The permanent magnet is installed inside the slider and corresponds to the horizontal rolling roll. The pull rod is slidably inserted into a vertical through-hole at the top of the frame. The lower end of the pull rod is fixedly connected to the slider, and a handle is installed at the upper end. The limiting plate is fixed in the middle of the pull rod and corresponds to the top of the frame. The elastic positioning piece is a bent spring sheet, one end of which is fixed to the lower inner wall of the frame, and the other end slides in contact with the inner wall of the frame. The middle of the elastic positioning piece bulges inward towards the frame, preventing the slider from moving downward under the action of magnetic force and gravity.

[0010] The centering device for the universal rolling mill rail guide mentioned above has reinforcing ribs on the upper part of the reference plate.

[0011] The alignment device for the universal rolling mill rail guide mentioned above includes two sets of levelness markers, which are symmetrically installed on both sides of the inverted U-shaped plate.

[0012] The above-mentioned centering device for the universal rolling mill rail guide includes four sets of magnetic lockers.

[0013] A method for centering a universal rolling mill rail guide, the method comprising the following steps: a. Leveling the positioning base: Place the inverted U-shaped plate vertically across the lower horizontal roll of the universal rolling mill, pull up the handle of the magnetic lock to move the slider above the elastic positioning plate and position it there. Adjust the tilt angle of the reference plate by rotating the four leveling bolts. When the tip of the gravity pointer points to the zero mark on the scale and all four leveling bolts are pressed against the horizontal roll, the leveling of the reference plate is complete. b. Locking of the positioning base frame: Press down the handle of the magnetic lock to reduce the distance between the permanent magnet and the horizontal roller. When the limiting plate contacts the top of the frame, the positioning base is attracted to the horizontal roller under the action of magnetic force, thus locking the positioning base. c. The guide's centering: Simultaneously turn on the sixth and fourth laser emitters. Use a ruler to measure the distance between the outer surface of the entrance guide rail head side and the laser beam emitted by the sixth laser emitter, as well as the distance between the outer surface of the entrance guide rail bottom side and the laser beam emitted by the fourth laser emitter. Adjust the horizontal position of the entrance guide so that the distance between the outer surface of the entrance guide rail head side and the laser beam emitted by the sixth laser emitter, as well as the distance between the outer surface of the entrance guide rail bottom side and the laser beam emitted by the fourth laser emitter, all meet the process requirements. Then lock the entrance guide. Simultaneously turn on the fifth and third laser emitters. Use a ruler to measure the distance between the outer surface of the head side of the exit guide rail and the laser beam emitted by the fifth laser emitter, as well as the distance between the outer surface of the bottom side of the exit guide rail and the laser beam emitted by the third laser emitter. Adjust the horizontal position of the exit guide so that the distance between the outer surface of the head side of the exit guide rail and the laser beam emitted by the fifth laser emitter, as well as the distance between the outer surface of the bottom side of the exit guide rail and the laser beam emitted by the third laser emitter, all meet the process requirements. Then lock the exit guide. D. Leveling of the guide: Turn on the second laser emitter, measure the distance between the upper surface of the entrance guide and the laser beam emitted by the second laser emitter using a ruler, and adjust the height of both ends of the entrance guide so that the distance between the two ends of the upper surface of the entrance guide and the laser beam emitted by the second laser emitter is equal and meets the process requirements. Turn on the first laser emitter, measure the distance between the upper surface of the exit guide and the laser beam emitted by the first laser emitter using a ruler, and adjust the height of both ends of the exit guide so that the distance between the two ends of the upper surface of the exit guide and the laser beam emitted by the first laser emitter is equal and meets the process requirements. Lock the eccentric adjusting shaft of the universal rolling mill guide device to achieve precise adjustment of the guide's level.

[0014] This invention uses the positioning base frame as a reference component and the laser beam emitted by the laser emitter installed on it as a reference line to determine the position of the guide. This greatly reduces the difficulty of installing and adjusting the rail guide of the universal rolling mill, and can effectively improve the offline installation accuracy and efficiency of the guide, ensuring the smooth progress of rail rolling production. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of a universal rolling mill rolling steel rails; Figure 2 This is a schematic diagram of the installation of rail guides for a universal rolling mill. Figure 1 (Left view) Figure 3 These are three views of the centering device for the universal rolling mill rail guide of the present invention, wherein... Figure 3 (a) is the front view. Figure 3 (b) is the left view. Figure 3 (c) is a top view; Figure 4 These are the three views of the positioning base frame, among which... Figure 4 (a) is the front view. Figure 4 (b) is the left view. Figure 4 (c) is a top view; Figure 5 This is a schematic diagram of the locking mechanism; Figure 6 yes Figure 5 A magnified view of a section at point A in the middle; Figure 7 This is an installation schematic diagram of the centering device for the universal rolling mill rail guide of the present invention; Figure 8 This is a schematic diagram of the centering method for the universal rolling mill rail guide of the present invention, wherein... Figure 8 (a) is the front view. Figure 8 (b) is a top view.

[0017] The labels in the diagram are as follows: 1. Inverted U-shaped plate; 2. Base plate; 3. Reinforcing rib; 4. Gravity pointer; 5. Scale line; 6. Rotation shaft; 7. Leveling bolt; 8. Nut; 9. Permanent magnet; 10. Slider; 11. Frame; 12. First laser emitter; 13. Second laser emitter; 14. Third laser emitter; 15. Fourth laser emitter; 16. Fifth laser emitter; 17. Sixth laser emitter; 18. Horizontal roller; 19. Inlet guide; 20. Outlet guide; 1. Horizontal positioning hole; 22. Rail head side positioning hole; 23. Rail bottom side positioning hole; 24. Rail head vertical roller; 25. Rail bottom vertical roller; 26. Rail; 27. Pull rod; 28. Limiting plate; 29. ​​Handle; 30. Elastic positioning piece; 31. Centering device; 32. Ruler; 33. Laser beam emitted by the first laser emitter; 34. Laser beam emitted by the fifth laser emitter; 35. Laser beam emitted by the third laser emitter; 36. Slider through hole; 37. Bolt hole; 38. Rotary shaft mounting hole. Detailed Implementation

[0018] This invention provides a centering device and method for universal rolling mill rail guides, enabling the offline installation and adjustment of universal rolling mill rail guides to achieve target position visualization, quantifiable position installation and adjustment, and standardized installation and adjustment by workers in different positions. This effectively improves the offline assembly quality of universal rolling mill guides and enhances rail rolling quality and production efficiency.

[0019] See Figure 3-5 The universal rolling mill rail guide centering device provided by this invention includes a positioning base frame, a base frame positioning mechanism, and a guide positioning mechanism. The positioning base frame provides a reference for the installation and adjustment of the guide; the base frame positioning mechanism levels and locks the positioning base frame; and the guide positioning mechanism centers and adjusts the levelness of the guide.

[0020] See Figure 4 The positioning base frame includes an inverted U-shaped plate 1, a reference plate 2, and a reinforcing rib 3. The lower groove of the inverted U-shaped plate 1 matches the diameter of the pass of the horizontal roll 18. The inverted U-shaped plate 1 straddles the lower horizontal roll 18 of the universal mill and fits tightly against the top and sides of the horizontal roll 18. Its neutral line coincides with the neutral line of the pass of the horizontal roll 18. The reference plate 2 is horizontally fixed to the top of the inverted U-shaped plate 1, that is, the reference plate 2 and the inverted U-shaped plate 1 are vertically fixedly connected. The upper part of the reference plate 2 with a pre-reserved working gap is provided with a reinforcing rib 3 to enhance the overall strength of the component.

[0021] See Figure 3 The base frame positioning mechanism includes three functional components: a level indicator, a level adjuster, and a magnetic lock.

[0022] Two sets of level indicators are installed symmetrically on both sides of the inverted U-shaped plate 1. Each set of level indicators includes a gravity pointer 4, a scale line 5, and a rotation shaft 6. The upper end of the gravity pointer 4 is rotatably connected to the inverted U-shaped plate 1 through the rotation shaft 6 and the rotation shaft mounting hole 38 set on the outer side of the inverted U-shaped plate 1. The lower end of the gravity pointer 4 corresponds to the scale line 5 on the outer side of the lower end of the inverted U-shaped plate 1. The current levelness of the reference plate 2 is indicated by the position deflection of the gravity pointer 4.

[0023] The leveling adjuster consists of four leveling bolts 7 and four nuts 8. The four nuts 8 are welded and fixed on the reference plate 2 and distributed on both sides of the axis of the horizontal roll 18. The four leveling bolts 7 are screwed into the four nuts 8 respectively, and after passing through the bolt holes 37 on the reference plate 2, they contact the corresponding positions on the surface of the horizontal roll 18.

[0024] Four sets of magnetic lockers are provided. Each set of magnetic lockers includes a permanent magnet 9, a slider 10, a frame 11, a pull rod 27, a limiting plate 28, a handle 29, and an elastic positioning piece 30. A slider through hole 36 matching the slider 10 of each set of magnetic lockers is provided on the reference plate 2. The slider through hole 36 is a through hole. The frame 11 is welded to the reference plate 2 and located above the slider through hole 36. The frame 11 has a vertical slide rail matching the slider 10 inside. The slider 10 is slidably installed in the vertical slide rail and the slider through hole 36 and can slide up and down along the vertical slide rail and the slider through hole 36. The permanent magnet 9 is installed inside the slider 10 and can generate magnetic force on the horizontal roller 18. The pull rod 27 is slidably inserted into the vertical through hole at the top of the frame 11. The lower end of the pull rod 27 is fixedly connected to the slider 10, and the upper end is equipped with a handle 29. The limiting plate 28 is fixed in the middle of the pull rod 27. When the slider 10, which has a permanent magnet 9 inside, slides down to a position close to the horizontal roller 18, the limiting plate 28 contacts the top of the frame 11, restricting the slider 10 from moving further down. At this time, there is a certain gap between the slider 10 and the horizontal roller 18. The magnetic force of the horizontal roller 18 on the permanent magnet 9 is applied to the top of the frame 11 in sequence through the slider 10, the pull rod 27, and the limiting plate 28. Then, the frame 11 applies downward pressure to the reference plate 2, thereby firmly fixing the positioning base frame on the horizontal roller 18.

[0025] See Figure 5 The elastic positioning piece 30 is a curved spring piece, one end of which is fixed to the inner wall of the lower end of the frame 11, and the other end slides in contact with the inner wall of the frame 11. The middle part bulges into the frame 11. When the slider 10 is moved down by pressing down the handle 29, the side wall of the slider 10 flattens the elastic positioning piece 30 and moves towards the horizontal roller 18. When the handle 29 is pulled up to move the slider 10 up to above the elastic positioning piece 30, the elastic positioning piece 30 returns to its original shape, and its bulging middle part prevents the slider 10 from moving down under the action of magnetic force and gravity.

[0026] The specific steps for leveling and locking the positioning base frame are as follows: Leveling the positioning base frame: Place the inverted U-shaped plate 1 vertically across the lower horizontal roll 18 of the universal rolling mill, and pull up the handles 29 of the four sets of magnetic locks respectively, so that the slider 10 moves above the elastic positioning plate 30 and is positioned by the elastic positioning plate 30. At this time, the distance between the permanent magnet 9 and the horizontal roll 18 is large, and the magnetic force between them is small. Adjust the tilt angle of the reference plate 2 by rotating the four leveling bolts 7. When the tip of the gravity pointer 4 points to the zero position of the scale line 5, and all four leveling bolts 7 are pressing against the horizontal roll 18, the leveling of the reference plate 2 is completed.

[0027] Locking of the positioning base frame: After the positioning base frame is leveled, the handles 29 of the four sets of magnetic locks are pressed down respectively, which reduces the distance between the permanent magnet 9 and the horizontal roller 18 and increases the magnetic force between them. When the limiting plate 28 contacts the top of the frame 11, the magnetic force between the permanent magnet 9 and the horizontal roller 18 reaches its maximum value. The positioning base frame is attracted to the horizontal roller 18 under the action of magnetic force, thus locking the positioning base frame.

[0028] The guide positioning mechanism includes two horizontal positioning laser emitters, two railhead-side positioning laser emitters, and two railbot-side positioning laser emitters. The two horizontal positioning laser emitters are the first laser emitter (exit guide horizontal positioning laser emitter) 12 and the second laser emitter (entrance guide horizontal positioning laser emitter) 13, respectively; the two railbot-side positioning laser emitters are the third laser emitter (exit guide railbot-side positioning laser emitter) 14 and the fourth laser emitter (entrance guide railbot-side positioning laser emitter) 15, respectively; and the two railhead-side positioning laser emitters are the fifth laser emitter (exit guide railhead-side positioning laser emitter) 16 and the sixth laser emitter (entrance guide railhead-side positioning laser emitter) 17, respectively.

[0029] A horizontal positioning hole 21 is provided on the reference plate 2. After the reference plate 2 is leveled, the horizontal positioning hole 21 is located on the neutral line of the hole pattern of the horizontal roll 18. The first laser emitter 12 and the second laser emitter 13 are coaxially installed in the horizontal positioning hole 21, and their irradiation directions are respectively facing the exit side and the entrance side of the universal mill. The laser beams emitted by the two are higher than the upper surfaces of the exit guide 20 and the entrance guide 19.

[0030] On the lower sides of the inverted U-shaped plate 1, there are rail head side positioning holes 22 and rail bottom side positioning holes 23, which are parallel to the horizontal positioning holes 21. The rail head side positioning holes 22 and rail bottom side positioning holes 23 are at the same height. The rail head side positioning holes 22 are located at the widest part of the rail head side hole of the inverted U-shaped plate 1, and the rail bottom side positioning holes 23 are located at the widest part of the rail bottom side hole of the inverted U-shaped plate 1.

[0031] The third laser emitter 14 and the fourth laser emitter 15 are coaxially installed in the positioning hole 23 on the bottom of the rail, and their irradiation directions are respectively facing the exit side and the entrance side of the universal rolling mill; the fifth laser emitter (exit guide rail head side positioning laser emitter) 16 and the sixth laser emitter (entrance guide rail head side positioning laser emitter) 17 are coaxially installed in the positioning hole 22 on the rail head side, and their irradiation directions are respectively facing the exit side and the entrance side of the universal rolling mill.

[0032] The specific steps for centering and leveling the guide are as follows: Guide's centering: Simultaneously open the sixth laser emitter 17 and the fourth laser emitter 15. Use a ruler 32 to measure the distance between the outer surface of the rail head side of the entrance guide 19 and the laser beam emitted by the sixth laser emitter 17, as well as the distance between the outer surface of the rail bottom side of the entrance guide 19 and the laser beam emitted by the fourth laser emitter 15. Adjust the horizontal position of the entrance guide 19 so that the distance between the outer surface of the rail head side of the entrance guide 19 and the laser beam emitted by the sixth laser emitter 17, as well as the distance between the outer surface of the rail bottom side of the entrance guide 19 and the laser beam emitted by the fourth laser emitter 15, all meet the process requirements. Then lock the entrance guide 19. Simultaneously activate the fifth laser emitter 16 and the third laser emitter 14. Use a ruler 32 to measure the distance between the outer surface of the rail head side of the exit guide 20 and the laser beam emitted by the fifth laser emitter 16, as well as the distance between the outer surface of the rail bottom side of the exit guide 20 and the laser beam emitted by the third laser emitter 14. Adjust the horizontal position of the exit guide 20 so that the distance between the outer surface of the rail head side of the exit guide 20 and the laser beam emitted by the fifth laser emitter 16, and the distance between the outer surface of the rail bottom side of the exit guide 20 and the laser beam emitted by the third laser emitter 14, all meet the process requirements. Then lock the exit guide 20; thus achieving precise adjustment of the guide's centering position.

[0033] Leveling of the guide: Turn on the second laser emitter 13, measure the distance between the upper surface of the entrance guide 19 and the laser beam emitted by the second laser emitter 13 using a ruler 32, and adjust the height of both ends of the entrance guide 19 so that the distance between the two ends of the upper surface of the entrance guide 19 and the laser beam emitted by the second laser emitter 13 is equal and meets the process requirements. Turn on the first laser emitter 12, measure the distance between the upper surface of the exit guide 20 and the laser beam emitted by the first laser emitter 12 using a ruler 32, and adjust the height of both ends of the exit guide 20 so that the distance between the two ends of the upper surface of the exit guide 20 and the laser beam emitted by the first laser emitter 12 is equal and meets the process requirements. Lock the eccentric adjustment shaft of the guide device to achieve precise adjustment of the guide's level.

[0034] This invention arranges six laser emitters on a positioning base frame, wherein the laser beams emitted by the first laser emitter 12 and the second laser emitter 13 serve as reference lines for adjusting the levelness of the exit guide 20 and the entrance guide 19. The inverted U-shaped plate 1, secured to the perforated surface of the horizontal roll 18, ensures that the first laser emitter 12 and the second laser emitter 13 are always positioned at the neutral line of the arc at the rail web. The leveling action of the leveling bolt 7 and the magnetic attraction of the permanent magnet 9 ensure that the reference plate 2 and the first laser emitter 12 and the second laser emitter 13 installed inside it are always in a horizontal position. By measuring the distance between the upper surface of the entrance guide 19 and the exit guide 20 and the laser beams emitted by the second laser emitter 13 and the first laser emitter 12 with a ruler, and by adjusting the installation height of the guide's upper surface to maintain consistent distances with the corresponding laser beams, the quality requirement of straight guide installation is achieved. The method for measuring the distance between the upper surface of the guide and the laser beam is as follows: place one end of the ruler 32 against the upper surface of the guide and keep the ruler 32 perpendicular to the upper surface of the guide. Move the ruler 32 so that the laser beam shines on the ruler 32. Read the distance from the center of the circular spot (or the upper and lower edges of the spot, but the reading position must be kept consistent) to the upper surface of the guide.

[0035] The laser beams emitted by the fifth laser emitter 16 and the third laser emitter 14 serve as the reference line for adjusting the horizontal position of the exit guide 20, and the laser beams emitted by the sixth laser emitter 17 and the fourth laser emitter 15 serve as the reference line for adjusting the horizontal position of the inlet guide 19. The reading method during measurement is the same as described above.

Claims

1. A centering device for a universal rolling mill rail guide, characterized in that, The system includes a positioning base frame, a base frame positioning mechanism, and a guide positioning mechanism. The positioning base frame includes an inverted U-shaped plate (1) and a reference plate (2). The inverted U-shaped plate (1) straddles the lower horizontal roll (18) of the universal rolling mill and is in close contact with the top and sides of the horizontal roll (18). The reference plate (2) is horizontally fixed to the top of the inverted U-shaped plate (1). The base frame positioning mechanism is installed on the positioning base frame to level and lock the positioning base frame. The guide positioning mechanism includes multiple laser emitters installed on the positioning base frame. The laser beams emitted by these emitters serve as a reference line for determining the position of the universal rolling mill rail guide. The guide positioning mechanism also includes a third laser emitter (14), a fourth laser emitter (15), a fifth laser emitter (16), and a sixth laser emitter (17). On the lower sides of the inverted U-shaped plate (1), there are rail head side positioning holes (22) and rail bottom side positioning holes (23) parallel to the horizontal positioning holes (21), respectively. The rail head side positioning hole (22) is located at the widest part of the rail head side hole of the inverted U-shaped plate (1), and the rail bottom side positioning hole (23) is located at the widest part of the rail bottom side hole of the inverted U-shaped plate (1). The third laser emitter (14) and the fourth laser emitter (15) are coaxially installed in the rail bottom side positioning hole (23), and their irradiation directions are respectively towards the exit side and the entrance side of the universal rolling mill. The fifth laser emitter (16) and the sixth laser emitter (17) are coaxially installed in the rail head side positioning hole (22), and their irradiation directions are respectively towards the exit side and the entrance side of the universal rolling mill. The base frame positioning mechanism includes a level indicator and a level adjuster. The level indicator includes a gravity pointer (4) and a rotating shaft (6). The upper end of the gravity pointer (4) is rotatably connected to the outer side of the inverted U-shaped plate (1) through the rotating shaft (6). The lower end of the gravity pointer (4) corresponds to the scale line (5) on the outer side of the lower end of the inverted U-shaped plate (1). The level adjuster includes four leveling bolts (7) and four nuts (8). The four nuts (8) are welded and fixed on the reference plate (2). The four leveling bolts (7) are screwed into the four nuts (8) respectively, and after passing through the bolt holes (37) on the reference plate (2), they contact the horizontal roller (18). The base frame positioning mechanism also includes a magnetic lock, which includes a permanent magnet (9), a slider (10), a frame (11), a pull rod (27), a limiting plate (28), a handle (29), and an elastic positioning piece (30). A slider through hole (36) matching the slider (10) is provided on the reference plate (2). The frame (11) is welded to the reference plate (2) and located above the slider through hole (36). The frame (11) has a vertical slide rail matching the slider (10) inside. The slider (10) is slidably installed in the vertical slide rail and the slider through hole (36). The permanent magnet (9) is installed on the slider (10). The inner part of the frame (11) corresponds to the horizontal roller (18). The pull rod (27) is slidably inserted into the vertical through hole at the top of the frame (11). The lower end of the pull rod (27) is fixedly connected to the slider (10), and the upper end is equipped with a handle (29). The limiting plate (28) is fixed in the middle of the pull rod (27) and corresponds to the top of the frame (11). The elastic positioning piece (30) is a bent spring piece. One end of the spring piece is fixed on the lower inner wall of the frame (11), and the other end slides in contact with the inner wall of the frame (11). The middle part of the elastic positioning piece (30) bulges into the frame (11) to prevent the slider (10) from moving downward under the action of magnetic force and gravity.

2. The centering device for a universal rolling mill rail guide according to claim 1, characterized in that, The guide positioning mechanism includes a first laser emitter (12) and a second laser emitter (13). A horizontal positioning hole (21) is provided on the reference plate (2). The horizontal positioning hole (21) is located on the neutral line of the hole pattern of the horizontal roll (18) of the universal mill. The first laser emitter (12) and the second laser emitter (13) are coaxially installed in the horizontal positioning hole (21) and their irradiation directions are respectively facing the exit side and the entrance side of the universal mill. The horizontal laser beams emitted by the two are respectively located above the upper surface of the exit guide (20) and the entrance guide (19) of the universal mill.

3. The centering device for a universal rolling mill rail guide according to claim 2, characterized in that, The upper part of the reference plate (2) is provided with reinforcing ribs (3).

4. The centering device for a universal rolling mill rail guide according to claim 3, characterized in that, Two sets of levelness indicators are provided and symmetrically installed on both sides of the inverted U-shaped plate (1).

5. The centering device for a universal rolling mill rail guide according to claim 4, characterized in that, Four sets of magnetic locks are provided.

6. A centering method using the centering device according to any one of claims 2-5, the method comprising the following steps: a. Leveling the positioning base: Place the inverted U-shaped plate (1) vertically across the lower horizontal roll (18) of the universal rolling mill, pull up the handle (29) of the magnetic lock, so that the slider (10) moves above the elastic positioning plate (30) and is positioned by the elastic positioning plate (30). Adjust the tilt angle of the reference plate (2) by rotating the four leveling bolts (7). When the tip of the gravity pointer (4) points to the zero position of the scale line (5) and all four leveling bolts (7) are pressed against the horizontal roll (18), the leveling of the reference plate (2) is completed. b. Locking of the positioning base frame: Press down the handle (29) of the magnetic lock to reduce the distance between the permanent magnet (9) and the horizontal roller (18). When the limiting plate (28) contacts the top of the frame (11), the positioning base is attracted to the horizontal roller (18) under the action of magnetic force, thereby locking the positioning base. c. The guide's centering: Simultaneously turn on the sixth laser emitter (17) and the fourth laser emitter (15), and measure the distance between the outer surface of the rail head side of the entrance guide (19) and the laser beam emitted by the sixth laser emitter (17) and the distance between the outer surface of the rail bottom side of the entrance guide (19) and the laser beam emitted by the fourth laser emitter (15) using a ruler (32). Adjust the horizontal position of the entrance guide (19) so that the distance between the outer surface of the rail head side of the entrance guide (19) and the laser beam emitted by the sixth laser emitter (17) and the distance between the outer surface of the rail bottom side of the entrance guide (19) and the laser beam emitted by the fourth laser emitter (15) both meet the process requirements. Then lock the entrance guide (19). Simultaneously turn on the fifth laser emitter (16) and the third laser emitter (14), and measure the distance between the outer surface of the rail head side of the exit guide (20) and the laser beam emitted by the fifth laser emitter (16), as well as the distance between the outer surface of the rail bottom side of the exit guide (20) and the laser beam emitted by the third laser emitter (14) using a ruler (32). Adjust the horizontal position of the exit guide (20) so that the distance between the outer surface of the rail head side of the exit guide (20) and the laser beam emitted by the fifth laser emitter (16), as well as the distance between the outer surface of the rail bottom side of the exit guide (20) and the laser beam emitted by the third laser emitter (14) both meet the process requirements. Then lock the exit guide (20). D. Leveling of the guide: Turn on the second laser emitter (13), measure the distance between the upper surface of the entrance guide (19) and the laser beam emitted by the second laser emitter (13) using a ruler (32), adjust the height of both ends of the entrance guide (19) so that the distance between the two ends of the upper surface of the entrance guide (19) and the laser beam emitted by the second laser emitter (13) is equal and meets the process requirements; Turn on the first laser emitter (12), measure the distance between the upper surface of the exit guide (20) and the laser beam emitted by the first laser emitter (12) using a ruler (32), adjust the height of both ends of the exit guide (20) so that the distance between the two ends of the upper surface of the exit guide (20) and the laser beam emitted by the first laser emitter (12) is equal and meets the process requirements; Lock the eccentric adjusting shaft of the universal rolling mill guide device to achieve precise adjustment of the guide's level.

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