Centering device and method for steel rail guide and guard of universal rolling mill

Abstract

The centering device comprises a positioning base frame, a base frame positioning mechanism and a guide and guard positioning mechanism, the positioning base frame comprises an inverted-U-shaped plate and a datum plate, the inverted-U-shaped plate straddles a horizontal roller on the lower side of the universal rolling mill and is tightly attached to the top and the two sides of the horizontal roller, and the datum plate is arranged on the inverted-U-shaped plate. The datum 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 and used for leveling and locking the positioning base frame, the guide and guard positioning mechanism comprises a plurality of laser emitters installed on the positioning base frame, and laser beams emitted by the laser emitters serve as datum lines for determining the steel rail guide and guard position of the universal rolling mill. The invention also provides a centering method, the positioning base frame is used as a reference part, and the laser beam emitted by the laser emitter is used as a reference line for determining the position of the guide, so that the installation and adjustment difficulty of the guide is greatly reduced, the offline installation precision and the installation efficiency of the guide can be effectively improved, and the smooth operation of steel rail rolling production is ensured.

Description

Technical Field

[0001] The invention relates to a device and a method for assisting a universal rolling mill in centering a rail guide, and belongs to the technical field of metallurgical equipment. Background Art

[0002] When using a universal rolling mill to roll rails, it is necessary to install guide devices on the inlet and outlet sides of the horizontal rollers to guide the rolled pieces to enter and exit the pass smoothly. However, since the various parts of the roller 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, no suitable point, line or surface can be found as the reference for the installation and adjustment of the guide device.

[0003] from Figure 1 and Figure 2 It can be seen that during the installation and adjustment process of the horizontal roller guide device of the universal rolling mill, the workers on duty cannot accurately control its position and levelness, and can only make adjustments through visual inspection and experience. Therefore, the guide installation accuracy is greatly affected by human factors (such as the experience, cognition, and adjustment and control ability of different workers), resulting in large differences and fluctuations. Moreover, this difference and fluctuation continues to change with the influence of external factors such as time and environment. It is difficult to effectively guarantee the repeatability and reproducibility of the centering installation of the universal rolling mill guide device, resulting in frequent rolling quality problems during the on-line operation of the roller system, requiring shutdown and adjustment. Therefore, it is very necessary to design a centering device for the universal rolling mill rail guide. Summary of the Invention

[0004] The purpose of the present invention is to provide a centering device and method for a universal rolling mill rail guide to address the shortcomings of the existing technology, so as to improve the installation accuracy of the rail guide device and ensure the smooth progress of rail rolling production.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A centering device for a universal rolling mill rail guide comprises a positioning base, a base positioning mechanism, and a guide positioning mechanism. The positioning base comprises an inverted U-shaped plate and a reference plate. The inverted U-shaped plate straddles the lower horizontal roller of the universal rolling mill and fits tightly against the top and both sides of the horizontal roller. The reference plate is horizontally fixed to the top of the inverted U-shaped plate. The base positioning mechanism is mounted on the positioning base to level and lock the positioning base. The guide positioning mechanism comprises a plurality of laser emitters mounted on the positioning base. The laser beams emitted by the laser emitters serve as a reference line for determining the position of the universal rolling mill rail guide.

[0006] The centering device of the universal rolling mill rail guide, the guide positioning mechanism includes 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 pass neutral line of the horizontal roller of the universal rolling mill, the first laser emitter and the second laser emitter are both coaxially installed in the horizontal positioning hole and the irradiation directions of the two are respectively toward the exit side and the entrance side of the universal rolling mill, and 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 centering device of the universal rolling mill rail guide, the guide positioning mechanism also includes a third laser emitter, a fourth laser emitter, a fifth laser emitter and a sixth laser emitter. Rail head side positioning holes and rail bottom side positioning holes parallel to the horizontal positioning holes are respectively provided at the lower parts of both sides of the inverted U-shaped plate. The rail head side positioning hole is set at the widest part of the rail head side hole profile of the inverted U-shaped plate, and the rail bottom side positioning hole is set at the widest part of the rail bottom side hole profile of the inverted U-shaped plate. The third laser emitter and the fourth laser emitter are coaxially installed in the rail bottom side positioning hole, and the irradiation directions of the two are respectively toward the exit side and entrance side of the universal rolling mill; the fifth laser emitter and the sixth laser emitter are coaxially installed in the rail head side positioning hole, and the irradiation directions of the two are respectively toward the exit side and entrance side of the universal rolling mill.

[0008] The above-mentioned centering device of the universal rolling mill rail guide, the base positioning mechanism includes a level marker and a level adjuster, the level marker includes a gravity pointer and a rotating shaft, the upper end of the gravity pointer is rotatably connected to the outer side surface of the inverted U-shaped plate through the rotating shaft, and the lower end of the gravity pointer corresponds to the scale line on the outer side surface of the lower end of the inverted U-shaped plate; the level adjuster includes four leveling bolts and four nuts, the four nuts are welded and fixed on the reference plate, the four leveling bolts are respectively screwed into the four nuts, and pass through the bolt holes on the reference plate and then contact the horizontal roller.

[0009] The above-mentioned centering device of the universal rolling mill rail guide, the base frame positioning mechanism also includes a magnetic lock, the magnetic lock includes a permanent magnet, a slider, a frame, a draw rod, a limit plate, a handle and an elastic positioning piece, a slider through hole matching the slider is opened on the reference plate, the frame is welded on the reference plate and is located above the slider through hole, a vertical slide matching the slider is provided inside the frame, the slider is slidably installed in the vertical slide and the slider through hole, the permanent magnet is installed inside the slider and corresponds to the horizontal roller, the draw rod is slidably inserted in the vertical through hole at the top of the frame, the lower end of the draw rod is fixedly connected to the slider, and the handle is installed at the upper end, the limit plate is fixed in the middle of the draw rod and corresponds to the top of the frame, the elastic positioning piece is a bent spring piece, one end of which is fixed on the inner wall of the lower end of the frame, and the other end is in sliding contact with the inner wall of the frame, and the middle part of the elastic positioning piece bulges toward the inside of the frame to prevent the slider from moving downward under the action of magnetism and gravity.

[0010] In the centering device of the universal rolling mill rail guide, reinforcing ribs are provided on the upper part of the reference plate.

[0011] The centering device of the universal rolling mill rail guide is provided with two sets of horizontality markers, which are symmetrically installed on both sides of the inverted U-shaped plate.

[0012] The centering device of the universal rolling mill rail guide is provided with four sets of magnetic lockers.

[0013] A method for centering a universal rolling mill rail guide, the method comprising the following steps: a. Leveling of positioning base: Place the inverted U-shaped plate vertically across the lower horizontal roller of the universal rolling mill, pull up the handle of the magnetic locker, move the slider above the elastic positioning piece and be positioned by the elastic positioning piece, and adjust the inclination angle of the reference plate by rotating the four leveling bolts. When the needle tip of the gravity pointer points to the zero position of the scale line and the four leveling bolts are against the horizontal roller, the reference plate is leveled; b. Locking of positioning base: Press down the handle of the magnetic locker to reduce the distance between the permanent magnet and the horizontal roller. When the limit plate contacts the top of the frame, the positioning base is adsorbed on the horizontal roller under the action of the magnetic force, thus locking the positioning base. c. Alignment of guide: Turn on the sixth laser emitter and the fourth laser emitter at the same time, use a ruler to measure the distance between the outer surface of the head side of the entrance guide rail and the laser beam emitted by the sixth laser emitter, as well as the distance between the outer surface of the bottom side of the entrance guide rail and the laser beam emitted by the fourth laser emitter, adjust the horizontal position of the entrance guide rail so that the distance between the outer surface of the head side of the entrance guide rail and the laser beam emitted by the sixth laser emitter, and the distance between the outer surface of the bottom side of the entrance guide rail and the laser beam emitted by the fourth laser emitter both meet the process requirements, and then lock the entrance guide rail; Turn on the fifth laser emitter and the third laser emitter at the same time, 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 rail 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 meet the process requirements, and then lock the exit guide rail; D. Leveling of guide guard: Turn on the second laser emitter, use a ruler to measure the distance between the upper surface of the entrance guide and the laser beam emitted by the second laser emitter, 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, use a ruler to measure the distance between the upper surface of the exit guide and the laser beam emitted by the first laser emitter, 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 adjustment shaft of the universal rolling mill guide device to achieve precise adjustment of the guide level.

[0014] The present invention uses the positioning base as a reference component and the laser beam emitted by the laser transmitter installed on the upper part thereof as the reference line for determining the position of the guide, which greatly reduces the difficulty of installing and adjusting the universal rolling mill rail guide, can effectively improve the offline installation accuracy and installation efficiency of the guide, and ensure the smooth progress of the rail rolling production. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 1 This is a schematic diagram of a universal rolling mill rolling rails; Figure 2 This is the installation diagram of the universal rolling mill rail guide ( Figure 1 Left view of ); Figure 3 This is a three-view drawing of the centering device for the universal rolling mill rail guide of the present invention, wherein Figure 3 (a) is the main view, Figure 3 (b) is the left view, Figure 3 (c) is a top view; Figure 4 It is the three-view drawing of the positioning base, among which Figure 4 (a) is the main view, Figure 4 (b) is the left view, Figure 3 (4) is a top view; Figure 5 It is a structural diagram of the locking mechanism; Figure 6 yes Figure 5 A partial enlarged view of point A in the middle; Figure 7 This is a schematic diagram of the installation of a centering device for a universal rolling mill rail guide according to the present invention; Figure 8 This is a schematic diagram of the centering method of the universal rolling mill rail guide of the present invention, wherein Figure 8 (a) is the main view, Figure 8 (b) is a top view.

[0017] The numbers in the figure are as follows: 1. Inverted U-shaped plate; 2. Reference plate; 3. Reinforcement rib; 4. Gravity pointer; 5. Scale line; 6. Rotation axis; 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; 2 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-out rod; 28. Limit 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. Rotating axis mounting hole. DETAILED DESCRIPTION

[0018] The present invention provides a centering device and method for a universal rolling mill rail guide, which enables the offline installation and adjustment of the universal rolling mill rail guide device to realize the visualization of the target position, the quantification of the position installation adjustment, and the standardization of the installation and adjustment by workers in different positions, thereby effectively improving the offline assembly quality of the universal rolling mill guide device and improving the rail rolling quality and production efficiency.

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

[0020] See Figure 4 The positioning base includes an inverted U-shaped plate 1, a reference plate 2, and a reinforcing rib 3. The lower notch of the inverted U-shaped plate 1 matches the hole size of the horizontal roller 18. The inverted U-shaped plate 1 straddles the lower horizontal roller 18 of the universal rolling mill and fits tightly with the top and both sides of the horizontal roller 18. Its neutral line coincides with the neutral line of the hole of the horizontal roller 18; the reference plate 2 is horizontally fixed on the top of the inverted U-shaped plate 1, that is, the reference plate 2 is vertically fixed to the inverted U-shaped plate 1, and a reinforcing rib 3 is set on the upper part of the working gap reserved in the middle of the reference plate 2 to enhance the overall strength of the component.

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

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

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

[0024] Four sets of magnetic lockers are provided, each comprising a permanent magnet 9, a slider 10, a frame 11, a draw rod 27, a limit plate 28, a handle 29, and an elastic positioning piece 30. A slider hole 36 is provided on the reference plate 2 to match the slider 10 of each set of magnetic lockers. The slider hole 36 is a through hole. The frame 11 is welded to the reference plate 2 and located above the slider hole 36. A vertical slideway matching the slider 10 is provided inside the frame 11. The slider 10 is slidably mounted in the vertical slideway and the slider hole 36 and can slide up and down along the vertical slideway and the slider hole 3. The permanent magnet 9 is mounted inside the slider 10 to generate a magnetic force on the horizontal roller 18. The pull-out rod 27 is slidably inserted into the vertical through-hole at the top of the frame 11. The lower end of the pull-out rod 27 is fixedly connected to the slider 10, and a handle 29 is installed at the upper end. The limit plate 28 is fixed to the middle of the pull-out rod 27. When the slider 10 with a permanent magnet 9 inside slides downward to a position close to the horizontal roller 18, the limit plate 28 contacts the top of the frame 11, limiting the slider 10 from continuing to move downward. 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 acts on the top of the frame 11 through the slider 10, the pull-out rod 27, and the limit plate 28 in turn, and then applies downward pressure to the reference plate 2 through the frame 11, thereby firmly fixing the positioning base 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 on the inner wall of the lower end of the frame 11, and the other end is in sliding contact with the inner wall of the frame 11. The middle part bulges toward the inside of the frame 11. When the slider 10 is moved downward by pressing the handle 29, the side wall of the slider 10 flattens the elastic positioning piece 30 and moves toward the horizontal roller 18. When the handle 29 is lifted upward to move the slider 10 upward to above the elastic positioning piece 30, the elastic positioning piece 30 returns to its original shape, and its raised middle part prevents the slider 10 from moving downward under the action of magnetism and gravity.

[0026] The specific steps for leveling and locking the positioning base are as follows: Leveling of the positioning base: vertically straddle the inverted U-shaped plate 1 on the lower horizontal roller 18 of the universal rolling mill, pull up the handles 29 of the four sets of magnetic lockers respectively, move the slider 10 above the elastic positioning piece 30 and be positioned by the elastic positioning piece 30. At this time, the distance between the permanent magnet 9 and the horizontal roller 18 is large, and the magnetic force between the two is small. The inclination angle of the reference plate 2 is adjusted by rotating the four leveling bolts 7. When the needle tip of the gravity pointer 4 points to the zero position of the scale line 5 and the four leveling bolts 7 are against the horizontal roller 18, the leveling of the reference plate 2 is completed.

[0027] Locking of the positioning base: After the positioning base is leveled, press down the handles 29 of the four sets of magnetic lockers respectively to reduce the distance between the permanent magnet 9 and the horizontal roller 18, and increase the magnetic force between the two. When the limit plate 28 contacts the top of the frame 11, the magnetic force between the permanent magnet 9 and the horizontal roller 18 reaches the maximum value, and the positioning base is adsorbed on the horizontal roller 18 under the action of the magnetic force, thereby achieving the locking of the positioning base.

[0028] The guide rail positioning mechanism includes two horizontal positioning laser emitters, two rail head side positioning laser emitters, and two rail bottom 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 (entry guide horizontal positioning laser emitter) 13; the two rail bottom side positioning laser emitters are the third laser emitter (exit guide rail bottom side positioning laser emitter) 14 and the fourth laser emitter (entry guide rail bottom side positioning laser emitter) 15; and the two rail head side positioning laser emitters are the fifth laser emitter (exit guide rail head side positioning laser emitter) 16 and the sixth laser emitter (entry guide rail head side positioning laser emitter) 17.

[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 profile of the horizontal roller 18. The first laser emitter 12 and the second laser emitter 13 are both coaxially installed in the horizontal positioning hole 21 and their irradiation directions are respectively toward the exit and entrance sides of the universal rolling 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] A rail head side positioning hole 22 and a rail bottom side positioning hole 23 parallel to the horizontal positioning hole 21 are respectively provided at the lower part of both sides of the inverted U-shaped plate 1. The rail head side positioning hole 22 and the rail bottom side positioning hole 23 are at the same height. The rail head side positioning hole 22 is set at the widest part of the rail head side hole profile of the inverted U-shaped plate 1, and the rail bottom side positioning hole 23 is set at the widest part of the rail bottom side hole profile of the inverted U-shaped plate 1.

[0031] The third laser emitter 14 and the fourth laser emitter 15 are coaxially installed in the rail bottom side positioning hole 23, and the irradiation directions of the two are respectively toward 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 rail head side positioning hole 22, and the irradiation directions of the two are respectively toward 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 alignment: Simultaneously turn on the sixth laser emitter 17 and the fourth laser emitter 15, and use the ruler 32 to measure the distance between the outer surface of the rail head side of the entry 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 entry guide 19 and the laser beam emitted by the fourth laser emitter 15. Adjust the horizontal position of the entry guide 19 so that the distance between the outer surface of the rail head side of the entry 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 entry guide 19 and the laser beam emitted by the fourth laser emitter 15 meet the process requirements, and then lock the entry guide 19. Turn on the fifth laser emitter 16 and the third laser emitter 14 at the same time, and use the ruler 32 to measure the distance between the outer surface of the 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 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 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 bottom side of the exit guide 20 and the laser beam emitted by the third laser emitter 14 meet the process requirements, and then lock the exit guide 20 to achieve precise adjustment of the centering position of the guide.

[0033] Leveling of the guide: Turn on the second laser emitter 13, use the ruler 32 to measure the distance between the upper surface of the entrance guide 19 and the laser beam emitted by the second laser emitter 13, and adjust the height of both ends of the entrance guide 19 so that the distance between 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, use the ruler 32 to measure the distance between the upper surface of the exit guide 20 and the laser beam emitted by the first laser emitter 12, and adjust the height of both ends of the exit guide 20 so that the distance between both 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 level.

[0034] The present invention arranges six laser emitters on a positioning base, wherein the laser beams emitted by the first laser emitter 12 and the second laser emitter 13 serve as the reference line for adjusting the horizontality of the exit guide 20 and the entrance guide 19. An inverted U-shaped plate 1 is clamped onto the surface pass of the horizontal roller 18, ensuring that the first laser emitter 12 and the second laser emitter 13 are always located at the neutral line of the circular arc at the rail waist. The leveling action of the leveling bolts 7 and the magnetic attraction of the permanent magnets 9 ensure that the reference plate 2 and the first laser emitter 12 and the second laser emitter 13 installed therein are always in a horizontal position. By measuring the distance between the upper surfaces 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, the installation height of the guide top surface is adjusted to maintain a consistent distance from the corresponding laser beams, thereby achieving the required quality of the guide installation flatness. The method for measuring the distance between the upper surface of the guide and the laser beam is to place one end of a ruler 32 on 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, and read the distance from the center of the circular light spot on the ruler (or the upper and lower edges of the light 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 when 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 when adjusting the horizontal position of the entrance 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 invention comprises a positioning base, a base positioning mechanism, and a guide positioning mechanism, wherein the positioning base comprises an inverted U-shaped plate (1) and a reference plate (2), wherein the inverted U-shaped plate (1) straddles the lower horizontal roller (18) of the universal rolling mill and is tightly fitted with the top and both sides of the horizontal roller (18), and the reference plate (2) is horizontally fixed on the top of the inverted U-shaped plate (1); the base positioning mechanism is installed on the positioning base to level and lock the positioning base, and the guide positioning mechanism comprises a plurality of laser emitters installed on the positioning base, and the laser beams emitted by the laser emitters serve as reference lines for determining the positions of the universal rolling mill rail guides.

2. A centering device for a universal rolling mill rail guide according to claim 1, characterized in that: The guide positioning mechanism comprises 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 hole neutral line of the horizontal roller (18) of the universal rolling mill; the first laser emitter (12) and the second laser emitter (13) are both coaxially installed in the horizontal positioning hole (21) and the irradiation directions of the first laser emitter (12) and the second laser emitter (13) are respectively directed toward the exit side and the entrance side of the universal rolling mill; the horizontal laser beams emitted by the first laser emitter and the second laser emitter are respectively located above the upper surface of the exit guide (20) and the entrance guide (19) of the universal rolling mill.

3. A centering device for a universal rolling mill rail guide according to claim 1 or 2, characterized in that: The guide positioning mechanism further includes a third laser emitter (14), a fourth laser emitter (15), a fifth laser emitter (16) and a sixth laser emitter (17). A rail head side positioning hole (22) and a rail bottom side positioning hole (23) parallel to the horizontal positioning hole (21) are respectively provided at the lower part of both sides of the inverted U-shaped plate (1). The rail head side positioning hole (22) is set 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 set 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 the irradiation directions of the two are respectively directed 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 the irradiation directions of the two are respectively directed towards the exit side and the entrance side of the universal rolling mill.

4. A centering device for a universal rolling mill rail guide according to claim 3, characterized in that: 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 surface 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 surface 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 respectively screwed into the four nuts (8) and pass through the bolt holes (37) on the reference plate (2) to contact the horizontal roller (18).

5. A centering device for a universal rolling mill rail guide according to claim 4, characterized in that: The base frame positioning mechanism also includes a magnetic locker, which includes a permanent magnet (9), a slider (10), a frame (11), a draw rod (27), a limit 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 is located above the slider through hole (36). A vertical slideway matching the slider (10) is provided inside the frame (11). The slider (10) is slidably installed in the vertical slideway and the slider through hole (36). The permanent magnet (9) is installed on the slider (10). The draw rod (27) is slidably inserted into the vertical through hole at the top of the frame (11), the lower end of the draw rod (27) is fixedly connected to the slider (10), and the upper end is provided with a handle (29). The limit plate (28) is fixed to the middle of the draw rod (27) and corresponds to the top of the frame (11). 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 is in sliding contact with the inner wall of the frame (11). The middle part of the elastic positioning piece (30) bulges toward the inside of the frame (11), preventing the slider (10) from moving downward under the action of magnetism and gravity.

6. A centering device for a universal rolling mill rail guide according to claim 5, characterized in that: A reinforcing rib (3) is provided on the upper portion of the reference plate (2).

7. A centering device for a universal rolling mill rail guide according to claim 6, characterized in that: Two sets of level markers are provided and symmetrically mounted on both sides of the inverted U-shaped plate (1).

8. A centering device for a universal rolling mill rail guide according to claim 7, characterized in that: The magnetic lockers are provided in four sets.

9. A centering method using the centering device according to any one of claims 5 to 8, the method comprising the following steps: a. Leveling of positioning base: The inverted U-shaped plate (1) is vertically straddled on the lower horizontal roller (18) of the universal rolling mill, and the handle (29) of the magnetic lock is pulled up to move the slider (10) above the elastic positioning piece (30) and positioned by the elastic positioning piece (30). The inclination angle of the reference plate (2) is adjusted by rotating the four leveling bolts (7). When the needle tip of the gravity pointer (4) points to the zero position of the scale line (5) and the four leveling bolts (7) are all against the horizontal roller (18), the leveling of the reference plate (2) is completed; b. Locking of positioning base: The handle (29) of the magnetic locker is pressed down to reduce the distance between the permanent magnet (9) and the horizontal roller (18). When the limit plate (28) contacts the top of the frame (11), the positioning base is adsorbed on the horizontal roller (18) under the action of the magnetic force, thereby achieving locking of the positioning base; c. Alignment of guide: Simultaneously turn on the sixth laser emitter (17) and the fourth laser emitter (15), 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) by 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) meet the process requirements, and then lock the entrance guide (19); Simultaneously turn on the fifth laser emitter (16) and the third laser emitter (14), 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), 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) by 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), 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) meet the process requirements, and then lock the exit guide (20); D. Leveling of guide guard: 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 heights of both ends of the entrance guide (19) so that the distances between both ends of the upper surface of the entrance guide (19) and the laser beam emitted by the second laser emitter (13) are equal and meet the process requirements; Turning on the first laser emitter (12), measuring the distance between the upper surface of the outlet guide (20) and the laser beam emitted by the first laser emitter (12) using a ruler (32), and adjusting the heights of both ends of the outlet guide (20) so that the distances between both ends of the upper surface of the outlet guide (20) and the laser beam emitted by the first laser emitter (12) are equal and meet process requirements; Lock the eccentric adjustment shaft of the universal rolling mill guide device to achieve precise adjustment of the guide level.

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