A main drive shaft balancing device for a rolling mill and the rolling mill itself.

Abstract

This invention relates to the field of rolling mill technology, and provides a main drive shaft balancing device and a rolling mill. A base and a support are spaced apart on a foundation. An upper bearing housing is used to mount the upper shaft, and a lower bearing housing is used to mount the lower shaft. The cylinder body of the upper vertical hydraulic cylinder is mounted on the base, with its piston end connected to the upper column. The end of the upper column away from the base is hinged to the upper bearing housing. The cylinder body of the lower vertical hydraulic cylinder is also mounted on the base, with its piston end connected to the lower column. The end of the lower column away from the base is hinged to the lower bearing housing. One end of the upper horizontal hydraulic cylinder is hinged to the end of the upper column away from the base, and the other end is hinged to the support. One end of the lower horizontal hydraulic cylinder is hinged to the end of the lower column away from the base, and the other end is hinged to the support. The cooperation of the vertical and horizontal balancing components of this invention balances the forces generated in various directions by the skewed rolls of the main drive shaft, adapting to the skewed roll conditions and ensuring rolling stability.

Description

Technical Field

[0001] This invention relates to the field of rolling mill technology, and more specifically, to a rolling mill main drive shaft balancing device and a rolling mill. Background Technology

[0002] During rolling mill operation, the axial force generated by the main drive shaft due to its own weight causes additional loads on the rolls and main motor. Prolonged exposure to these additional loads can lead to mechanical failures, or even serious equipment damage or accidents. Currently, rolling mills typically install main drive shaft balancing devices, which consist of vertical balancing hydraulic cylinders and a vertical balancing frame, to balance the axial force generated during operation. This reduces or eliminates the additional loads on the rolls and main motor, increasing the rolling mill's service life and operational safety.

[0003] However, with the advancement of steel rolling technology, more and more hot-rolled strip mills have adopted main drive shaft shifting technology. This technology not only evens out wear on the main drive shaft and extends the service life of the work rolls, but also improves the product's shape, bringing considerable economic benefits to steel companies. However, in the case of main drive shaft shifting, the shaft must extend or shorten to follow the position of the shifting rolls. The shaft is no longer a rigid component of fixed length. Existing main drive shaft balancing devices can only balance forces in a single direction, while the shifting rolls generate forces in multiple directions. Therefore, existing main drive shaft balancing devices are ill-suited to the shifting rolls, easily leading to significant vibrations during mill operation. Summary of the Invention

[0004] The problem solved by this invention is how to ensure the rolling stability during the operation of the main drive shaft roller.

[0005] To solve the above problems, the present invention provides a main drive shaft balancing device for rolling mills and a rolling mill.

[0006] In a first aspect, the present invention provides a balancing device for the main drive shaft of a rolling mill, comprising an upper bearing seat, a lower bearing seat, a base, a support, an upper column, a lower column, a vertical balancing assembly, and a horizontal balancing assembly;

[0007] The base and the support are spaced apart on the foundation, and the upper column and the lower column are respectively hinged to the base;

[0008] The upper bearing housing is used to install the upper connecting shaft, and the lower bearing housing is used to install the lower connecting shaft;

[0009] The vertical balancing assembly includes an upper vertical hydraulic cylinder and a lower vertical hydraulic cylinder. The cylinder body of the upper vertical hydraulic cylinder is mounted on the base, and the piston end of the upper vertical hydraulic cylinder is connected to the upper column. The end of the upper column away from the base is hinged to the upper bearing seat. The cylinder body of the lower vertical hydraulic cylinder is mounted on the base, and the piston end of the lower vertical hydraulic cylinder is connected to the lower column. The end of the lower column away from the base is hinged to the lower bearing seat.

[0010] The horizontal balancing assembly includes an upper horizontal hydraulic cylinder and a lower horizontal hydraulic cylinder. One end of the upper horizontal hydraulic cylinder is hinged to the end of the upper column away from the base, and the other end of the upper horizontal hydraulic cylinder is hinged to the support. One end of the lower horizontal hydraulic cylinder is hinged to the end of the lower column away from the base, and the other end of the lower horizontal hydraulic cylinder is hinged to the support.

[0011] Optionally, the base is provided with an upper positioning part and a lower positioning part, and the vertical balance assembly further includes an upper connecting rod and a lower connecting rod. One end of the upper connecting rod is hinged to the upper positioning part, and the other end is hinged to the end of the upper column near the base. One end of the lower connecting rod is hinged to the lower positioning part, and the other end is hinged to the end of the lower column near the base.

[0012] Optionally, the mill main drive shaft balancing device further includes a locking hydraulic cylinder and a limiting block. The limiting block is connected to the piston end of the locking hydraulic cylinder, which is mounted on the base. The locking hydraulic cylinder is used to move the limiting block to below the upper column or the lower column and abut against it.

[0013] Optionally, the base is provided with a slide rail, and the limiting block is slidably connected to the slide rail.

[0014] Optionally, the two upper columns are symmetrically arranged on the base, and the two upper vertical hydraulic cylinders are spaced apart on the base along the line connecting the two upper columns and are symmetrical along the center line of symmetry of the upper columns, and the piston ends of the two upper vertical hydraulic cylinders are respectively connected to the upper columns.

[0015] Optionally, the two lower columns are symmetrically arranged on the base, the lower bearing seat is connected between the ends of the two lower columns away from the base, and the two lower vertical hydraulic cylinders are spaced apart on the base along the line connecting the two lower columns and are symmetrical along the center line of symmetry of the lower columns, and the piston ends of the two lower vertical hydraulic cylinders are respectively connected to the two lower columns.

[0016] Optionally, the vertical balancing assembly further includes an upper hinge plate, which is disposed on the upper column, and the upper vertical hydraulic cylinder is hinged to the upper hinge plate.

[0017] Optionally, the vertical balancing assembly further includes a lower hinge plate, which is disposed on the lower column, and the lower vertical hydraulic cylinder is hinged to the lower hinge plate.

[0018] Optionally, the mill main drive shaft balancing device further includes a ladder, which is mounted on the support.

[0019] Secondly, the present invention provides a rolling mill, including the rolling mill main drive shaft balancing device as described above.

[0020] The beneficial effects of the mill main drive shaft balancing device of the present invention are as follows: The main drive shaft balancing device is fixedly mounted on the foundation via a base and supports, ensuring the operational stability of the device. The upper bearing housing houses the upper shaft, and the lower bearing housing houses the lower shaft. In use, the upper vertical hydraulic cylinder is used to lift or pull back the upper column to apply a force perpendicular to the foundation to the upper bearing housing, thus buffering and balancing the force perpendicular to the foundation generated by the upper shaft's skewed rolls. The lower vertical hydraulic cylinder works similarly. The extension or retraction of either end of the upper horizontal hydraulic cylinder generates a force parallel to the foundation, thus buffering and balancing the force parallel to the foundation generated by the upper shaft's skewed rolls. The lower horizontal hydraulic cylinder works similarly. The cooperation of the vertical and horizontal balancing components balances the forces generated in various directions by the main drive shaft's skewed rolls, adapting to the skewed roll conditions and ensuring rolling stability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the mill main drive shaft balancing device according to an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1-Upper bearing housing; 2-Lower bearing housing;

[0024] 3-Base; 31-Upper positioning part; 32-Lower positioning part

[0025] 4-Support; 5-Upper column; 6-Lower column;

[0026] 7-Vertical balance assembly; 71-Upper vertical hydraulic cylinder; 72-Lower vertical hydraulic cylinder; 73-Upper hinge plate; 74-Lower hinge plate;

[0027] 8-Horizontal balancing assembly; 81-Upper horizontal hydraulic cylinder; 82-Lower horizontal hydraulic cylinder

[0028] 9 - Escalator; 100 - Upper connecting shaft; 200 - Lower connecting shaft. Detailed Implementation

[0029] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0030] In the attached diagram, the Z-axis represents the vertical direction, i.e., up and down, with the positive direction of the Z-axis representing upward and the negative direction representing downward. The X-axis represents the horizontal direction and is designated as front and back, with the positive direction of the X-axis representing the front and the negative direction representing the back. The Y-axis represents the left and right position, with the positive direction of the Y-axis representing the left and the negative direction representing the right. It should be noted that the aforementioned representations of the Z, Y, and X axes are merely for the convenience of describing the invention and for 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 invention.

[0031] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0032] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0033] like Figure 1 As shown in the figure, the main drive shaft balancing device for a rolling mill provided in this embodiment of the invention is characterized by comprising an upper bearing seat 1, a lower bearing seat 2, a base 3, a support 4, an upper column 5, a lower column 6, a vertical balancing component 7, and a horizontal balancing component 8.

[0034] The base 3 and the support 4 are used to be spaced apart on the foundation, such as a rolling mill frame or the ground, and the upper column 5 and the lower column 6 are respectively hinged to the base 3.

[0035] The upper bearing housing 1 is used to install the upper connecting shaft 100, and the lower bearing housing 2 is used to install the lower connecting shaft 200.

[0036] The vertical balancing assembly 7 includes an upper vertical hydraulic cylinder 71 and a lower vertical hydraulic cylinder 72. The cylinder body of the upper vertical hydraulic cylinder 71 is mounted on the base 3, and the piston end of the upper vertical hydraulic cylinder 71 is connected to the upper column 5. The end of the upper column 5 away from the base 3 is hinged to the upper bearing seat 1. The cylinder body of the lower vertical hydraulic cylinder 72 is mounted on the base 3, and the piston end of the lower vertical hydraulic cylinder 72 is connected to the lower column 6. The end of the lower column 6 away from the base 3 is hinged to the lower bearing seat 2.

[0037] Specifically, the upper column 5 has a plate-like structure with a certain angled arc bend in the middle, so that the upper part of the upper column 5 is offset towards the positive X-axis direction. The cylinder body of the upper vertical hydraulic cylinder 71 is fixedly mounted on the base 3. The piston end of the upper vertical hydraulic cylinder 71 is hinged to the middle of the upper column 5. In use, the upper connecting shaft 100 roller generates a force perpendicular to the base direction. The piston end of the upper vertical hydraulic cylinder 71 extends and retracts, lifting or pulling the upper column 5. By applying a force perpendicular to the base direction and in the same direction as the force generated by the upper connecting shaft 100 roller perpendicular to the base direction to the hinged upper bearing seat 1, the force generated by the upper connecting shaft 100 roller perpendicular to the base direction is buffered and balanced. The lower column 6 has a plate-like structure with a certain angled arc bend in the middle, so that the upper part of the lower column 6 is offset towards the positive X-axis direction. The cylinder body of the lower vertical hydraulic cylinder 72 is fixedly mounted on the base 3. The piston end of the lower vertical hydraulic cylinder 72 is hinged to the middle of the lower column 6. In use, the lower connecting shaft 200 roller generates a force perpendicular to the base direction. The piston end of the lower vertical hydraulic cylinder 72 extends and retracts, lifting or pulling the lower column 6. By applying a force perpendicular to the base direction to the hinged lower bearing seat 2, and in the same direction as the force generated by the lower connecting shaft 200 roller perpendicular to the base direction, the force generated by the lower connecting shaft 200 roller perpendicular to the base direction is buffered and balanced. It should be noted that, since the height of the upper connecting shaft 100 is higher than that of the lower connecting shaft 200, the length of the upper column 5 is greater than that of the lower column 6. Furthermore, to prevent collisions or friction between the upper column 5 and the lower column 6 that could damage the device, the upper vertical hydraulic cylinder 71 is positioned near the edge of the base 3, and the lower vertical hydraulic cylinder 72 is positioned near the center of the base 3. The foundation can be the ground or a rolling mill frame.

[0038] The horizontal balancing assembly 8 includes an upper horizontal hydraulic cylinder 81 and a lower horizontal hydraulic cylinder 82. One end of the upper horizontal hydraulic cylinder 81 is hinged to the end of the upper column 5 away from the base 3, and the other end of the upper horizontal hydraulic cylinder 81 is hinged to the support 4. One end of the lower horizontal hydraulic cylinder 82 is hinged to the end of the lower column 6 away from the base 3, and the other end of the lower horizontal hydraulic cylinder 82 is hinged to the support 4.

[0039] Specifically, the upper horizontal hydraulic cylinder 81 is a double-rod hydraulic cylinder with piston rods at both ends. One end is hinged to the end of the upper column 5 away from the base 3, and the other end is hinged to the support 4. The upper horizontal hydraulic cylinder 81 and the upper vertical hydraulic cylinder 71 form a certain angle, for example, about 90 degrees. In use, the upper connecting shaft 100 generates a force parallel to the foundation direction when the roller moves. At least one piston end of the upper horizontal hydraulic cylinder 81 extends and retracts to buffer and balance the force generated by the upper connecting shaft 100 roller in the direction parallel to the foundation. For example, when the upper connecting shaft 100 generates a force in the negative X-axis direction, at least one piston end of the upper horizontal hydraulic cylinder 81 extends the roller running distance (this roller running distance can be obtained according to the displacement sensor) to balance the force generated by the upper connecting shaft 100 in the negative X-axis direction. The lower horizontal hydraulic cylinder 82 is a double-rod hydraulic cylinder, with piston rods at both ends. One end is hinged to the end of the lower column 6 away from the base 3, and the other end is hinged to the support 4. The lower horizontal hydraulic cylinder 82 forms a certain angle with the lower vertical hydraulic cylinder 72. Its operation is the same as that of the upper horizontal hydraulic cylinder 81, and will not be repeated here.

[0040] The operation method of the mill main drive shaft balancing device in this embodiment is described using some operating conditions:

[0041] When the mill is running, the upper connecting shaft 100 generates an upward force perpendicular to the base direction (positive Z-axis direction) and a forward force parallel to the base direction (positive X-axis direction). The piston end of the upper vertical hydraulic cylinder 71 extends, lifting the upper column 5 to generate an upward force perpendicular to the base direction (positive Z-axis direction) on the upper bearing seat 1. Either telescopic end of the upper horizontal hydraulic cylinder 81 extends to generate a forward force parallel to the base direction (positive X-axis direction) on the upper bearing seat 1. The lower connecting shaft 200 generates a downward force perpendicular to the base direction (negative Z-axis direction) and a backward force parallel to the base direction (negative X-axis direction) on the lower connecting shaft 200. The piston end of the lower vertical hydraulic cylinder 72 retracts, bringing the lower column 6 back to generate a downward force perpendicular to the base direction (negative Z-axis direction) on the lower bearing seat 2. Either telescopic end of the lower horizontal hydraulic cylinder 82 retracts to generate a backward force parallel to the base direction (negative X-axis direction) on the upper bearing seat 1.

[0042] In this embodiment, the main drive shaft balancing device of the rolling mill is fixedly mounted on the foundation using the base 3 and the support 4, ensuring the operational stability of the main drive shaft balancing device. The upper bearing seat 1 mounts the upper shaft 100, and the lower bearing seat 2 mounts the lower shaft 200. During use, the upper vertical hydraulic cylinder 71 is used to lift or pull back the upper column 5 to apply a force perpendicular to the foundation direction to the upper bearing seat 1, thus buffering and balancing the force perpendicular to the foundation direction generated by the skewed roll of the upper shaft 100. The lower vertical hydraulic cylinder 71 works similarly. Either extension or retraction of the upper horizontal hydraulic cylinder 81 generates a force parallel to the foundation direction, thus buffering and balancing the force parallel to the foundation direction generated by the skewed roll of the upper shaft 100. The lower horizontal hydraulic cylinder 82 works similarly. The cooperation between the vertical balancing assembly 7 and the horizontal balancing assembly 2 balances the forces generated in various directions by the skewed roll of the main drive shaft, adapting to the skewed roll operation of the main drive shaft and ensuring the stability of the rolling process.

[0043] Optionally, the base 3 is provided with an upper positioning part 31 and a lower positioning part 32, and the vertical balance assembly 7 further includes an upper connecting rod and a lower connecting rod. One end of the upper connecting rod is hinged to the upper positioning part 31, and the other end is hinged to the end of the upper column 5 near the base 3. One end of the lower connecting rod is hinged to the lower positioning part 32, and the other end is hinged to the end of the lower column 6 near the base 3.

[0044] Specifically, to prevent the upper column 5 from deflecting when it is lifted or pulled back by the upper vertical hydraulic cylinder 71, an upper connecting rod is provided. Its two ends are hinged to the upper positioning part 31 on the base 3 and the end of the upper column 5 near the base 3, respectively, to limit the movement of the upper column 5. The lower connecting rod works similarly to the upper connecting rod and will not be described further here. It should be noted that the heights of the upper positioning part 31 and the lower positioning part 32 can also be adjusted according to the heights of the upper bearing seat 1 and the lower bearing seat 2.

[0045] Optionally, the mill main drive shaft balancing device further includes a locking hydraulic cylinder and a limiting block. The limiting block is connected to the piston end of the locking hydraulic cylinder. The locking hydraulic cylinder is disposed on the base 3. The locking hydraulic cylinder is used to drive the limiting block to move below the upper column 5 or the lower column 6 and to abut against it.

[0046] Specifically, when the upper connecting shaft 1 needs repair or installation, firstly, the upper vertical hydraulic cylinder 71 extends to lift the upper column 5. Secondly, the telescopic end of the locking hydraulic cylinder extends to place the limiting block at the bottom of the upper column 5. Finally, the upper vertical hydraulic cylinder 71 retracts to bring the upper column 5 back, and the end of the upper column 5 near the base 3 abuts against the limiting block, locking the upper column 5. This ensures that the upper column 5 remains stable during the repair or installation of the upper connecting shaft 1, improving the safety of the repair and installation of the upper connecting shaft 1. The operation of the lower column 6 and the limiting block during the repair and installation of the lower connecting shaft 2 is the same and will not be repeated here.

[0047] Optionally, the base 3 is provided with a slide rail, and the limiting block is slidably connected to the slide rail to increase the smoothness of the sliding of the limiting block.

[0048] Optionally, the two upper columns 5 are symmetrically arranged on the base 3, and the two upper vertical hydraulic cylinders 71 are spaced apart on the base 3 along the line connecting the two upper columns 5 and are symmetrical along the center line of symmetry of the upper columns 5, and the piston ends of the two upper vertical hydraulic cylinders 71 are respectively connected to the upper columns 5.

[0049] Optionally, the two lower columns 6 are symmetrically arranged on the base 3, the lower bearing seat 2 is connected between the ends of the two lower columns 6 away from the base 3, and the two lower vertical hydraulic cylinders 72 are spaced apart on the base 3 along the line connecting the two lower columns 6 and are symmetrical along the center line of symmetry of the lower columns 6, and the piston ends of the two lower vertical hydraulic cylinders 72 are respectively connected to the two lower columns 6.

[0050] Specifically, the existing main drive shaft balancing device for rolling mills has a single balancing hydraulic cylinder centrally located. Due to manufacturing and on-site installation errors, this can easily lead to uneven load distribution, jamming, and damage to the balancing hydraulic cylinder. Therefore, in this embodiment, two upper column 5, two lower column 6, two upper vertical hydraulic cylinders 71, and two lower vertical hydraulic cylinders 72 are respectively installed on the base 3. Correspondingly, two upper horizontal hydraulic cylinders 81 and two lower horizontal hydraulic cylinders 82 are also installed, making the force on the balancing hydraulic cylinder more balanced and effectively solving the problem of uneven load distribution of a single balancing hydraulic cylinder.

[0051] Optionally, the vertical balancing assembly 7 further includes an upper hinge plate 73, which is disposed on the upper column 5, and the upper vertical hydraulic cylinder 71 is connected to the upper hinge plate 73.

[0052] Optionally, the vertical balancing assembly 7 further includes a lower hinge plate 74, which is disposed on the lower column 6, and the lower vertical hydraulic cylinder 72 is connected to the lower hinge plate 74.

[0053] Specifically, an upper hinge plate 73 is provided, and there can be four upper hinge plates 73, with two symmetrically arranged in the middle of one of the upper columns 5. The piston end of the upper vertical hydraulic cylinder 71 is located between two upper hinge plates 73 and connected by a pin to prevent jamming when the upper vertical hydraulic cylinder 71 lifts or pulls the upper column 5 back. The structure and connection method of the lower hinge plate 74 are the same as those of the upper hinge plates 73, and will not be described in detail here.

[0054] Optionally, the mill main drive shaft balancing device further includes a ladder 9, which is mounted on the support 4.

[0055] An embodiment of the present invention provides a rolling mill, including the rolling mill main drive shaft balancing device as described above.

[0056] The advantages of the rolling mill in this embodiment compared to the prior art are the same as those of the rolling mill main drive shaft balancing device described above, and will not be repeated here.

[0057] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A balancing device for the main drive shaft of a rolling mill, characterized in that, It includes an upper bearing housing (1), a lower bearing housing (2), a base (3), a support (4), an upper column (5), a lower column (6), a vertical balance assembly (7), and a horizontal balance assembly (8). The base (3) and the support (4) are used to be spaced apart on the foundation, and the upper column (5) and the lower column (6) are respectively hinged to the base (3); The upper bearing housing (1) is used to install the upper connecting shaft (100), and the lower bearing housing (2) is used to install the lower connecting shaft (200). The vertical balancing assembly (7) includes an upper vertical hydraulic cylinder (71) and a lower vertical hydraulic cylinder (72). The cylinder body of the upper vertical hydraulic cylinder (71) is mounted on the base (3). The piston end of the upper vertical hydraulic cylinder (71) is connected to the upper column (5). The end of the upper column (5) away from the base (3) is hinged to the upper bearing seat (1). The cylinder body of the lower vertical hydraulic cylinder (72) is mounted on the base (3). The piston end of the lower vertical hydraulic cylinder (72) is connected to the lower column (6). The end of the lower column (6) away from the base (3) is hinged to the lower bearing seat (2). The horizontal balancing assembly (8) includes an upper horizontal hydraulic cylinder (81) and a lower horizontal hydraulic cylinder (82). One end of the upper horizontal hydraulic cylinder (81) is hinged to the end of the upper column (5) away from the base (3), and the other end of the upper horizontal hydraulic cylinder (81) is hinged to the support (4). One end of the lower horizontal hydraulic cylinder (82) is hinged to the end of the lower column (6) away from the base (3), and the other end of the lower horizontal hydraulic cylinder (82) is hinged to the support (4). Both the upper horizontal hydraulic cylinder (81) and the lower horizontal hydraulic cylinder (82) are double-rod hydraulic cylinders, with piston rods at both ends.

2. The mill main drive shaft balancing device according to claim 1, characterized in that, The base (3) is provided with an upper positioning part (31) and a lower positioning part (32). The vertical balance component (7) also includes an upper connecting rod and a lower connecting rod. One end of the upper connecting rod is hinged to the upper positioning part (31), and the other end is hinged to the end of the upper column (5) near the base (3). One end of the lower connecting rod is hinged to the lower positioning part (32), and the other end is hinged to the end of the lower column (6) near the base (3).

3. The mill main drive shaft balancing device according to claim 1, characterized in that, It also includes a locking hydraulic cylinder and a limiting block. The limiting block is connected to the piston end of the locking hydraulic cylinder. The locking hydraulic cylinder is disposed on the base (3). The locking hydraulic cylinder is used to drive the limiting block to move below the upper column (5) or the lower column (6) and abut against it.

4. The mill main drive shaft balancing device according to claim 3, characterized in that, The base (3) is provided with a slide rail, and the limiting block is slidably connected to the slide rail.

5. The mill main drive shaft balancing device according to claim 1, characterized in that, Two upper columns (5) are symmetrically arranged on the base (3), and two upper vertical hydraulic cylinders (71) are spaced apart on the base (3) along the line connecting the two upper columns (5) and symmetrical along the center line of the upper columns (5). The piston ends of the two upper vertical hydraulic cylinders (71) are respectively connected to the upper columns (5).

6. The mill main drive shaft balancing device according to claim 1, characterized in that, Two lower columns (6) are symmetrically arranged on the base (3). The lower bearing seat (2) is connected between the ends of the two lower columns (6) away from the base (3). Two lower vertical hydraulic cylinders (72) are spaced apart on the base (3) along the line connecting the two lower columns (6) and are symmetrical along the center line of the lower columns (6). The piston ends of the two lower vertical hydraulic cylinders (72) are respectively connected to the two lower columns (6).

7. The mill main drive shaft balancing device according to claim 1, characterized in that, The vertical balancing assembly (7) also includes an upper hinge plate (73), which is disposed on the upper column (5), and the upper vertical hydraulic cylinder (71) is hinged to the upper hinge plate (73).

8. The mill main drive shaft balancing device according to claim 1, characterized in that, The vertical balancing assembly (7) also includes a lower hinge plate (74), which is disposed on the lower column (6), and the lower vertical hydraulic cylinder (72) is hinged to the lower hinge plate (74).

9. The mill main drive shaft balancing device according to claim 1, characterized in that, It also includes an escalator (9) which is mounted on the support (4).

10. A rolling mill, characterized in that, Includes the mill main drive shaft balancing device as described in any one of claims 1 to 9.

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