Roll bending system of large-opening-degree medium plate rolling mill and large-opening-degree medium plate rolling mill

Abstract

The invention provides a large-opening-degree medium plate rolling mill roll bending system and a large-opening-degree medium plate rolling mill, and relates to the technical field of rolling mills, and the large-opening-degree medium plate rolling mill roll bending system comprises a rack and a working roll assembly; the machine frame comprises two stand column sets which are arranged in the length direction in a spaced mode, roll bending blocks and guide sliding plates are installed on the installation faces of stand columns, upper roll bending cylinders which are arranged up and down are installed at the upper ends of the roll bending blocks, and the guide sliding plates are located above the roll bending blocks and extend up and down. The working roller assembly is arranged on the machine frame and arranged in the length direction of the machine frame, the end of the working roller assembly extends to the position between the two stand columns of the stand column set, and installation protruding blocks are arranged on the peripheral side of the end of the working roller assembly, connected with the upper end of the upper roller bending cylinder and matched with the guide sliding plate in a guiding mode. According to the large-opening-degree medium plate mill roll bending system, the size of the roll bending block assembly can be reduced, and the structural compactness of the roll bending block assembly is improved; the upper roll bending cylinder does not need to directly drive the guide cover, and the load borne by the upper roll bending cylinder can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of rolling mills, and in particular to a roll bending system of a medium plate rolling mill with a large opening and a medium plate rolling mill with a large opening. Background Art

[0002] The bending roll system is an important component of the medium plate rolling mill. It can adjust the mill roll gap convexity according to the plate shape control needs to ensure the quality of the rolled steel plate.

[0003] At present, the bending roll system usually includes a bending roll block assembly consisting of a bending roll block, an upper bending roll cylinder and a guide cover, wherein the upper bending roll cylinder is arranged at the upper end of the bending roll block, and the guide cover is covered on the bending roll block and cooperates with the bending roll block guide, and the guide cover is also connected to the upper bending roll cylinder and the working roll assembly respectively. When the upper bending roll cylinder is raised or lowered, it will drive the working roll assembly to rise or fall through the guide cover to adjust the opening degree of the rolling mill, and at the same time, the guide cover cooperates with the bending roll block guide to guide the lifting stroke of the working roll assembly. However, for a medium plate rolling mill with a large opening degree (for example, an opening degree of 500mm), the lifting stroke required for the upper bending roll cylinder may be large, which will cause the size of the guide cover to be larger, resulting in a large size of the bending roll block assembly. Summary of the invention

[0004] The problem solved by the invention is how to reduce the volume of a bending roll block assembly in a medium plate rolling mill with a large opening.

[0005] In order to solve the above problems, the present invention provides a medium plate rolling mill roll bending system with a large aperture and a medium plate rolling mill with a large aperture.

[0006] In the first aspect, the present invention provides a large-opening medium plate rolling mill bending roll system, comprising a frame and a working roll assembly; the frame comprises two column groups spaced apart along the length direction, the column group comprises two columns spaced apart along the width direction of the frame, in the column group, one of the columns has a mounting surface close to the other column, a bending roll block and a guide slide are mounted on the mounting surface, an upper bending roll cylinder arranged up and down is mounted on the upper end of the bending roll block, the guide slide is located above the bending roll block and extends up and down; the working roll assembly is arranged on the frame and arranged along the length direction of the frame, the end of the working roll assembly extends between the two columns of the column group, a mounting protrusion is provided on the circumferential side of the end of the working roll assembly, the mounting protrusion is connected to the upper end of the upper bending roll cylinder and cooperates with the guide slide.

[0007] Optionally, a mounting plate is detachably mounted on the mounting surface at a position above the bending roller block; and the guide slide plate is fixedly mounted on the mounting plate.

[0008] Optionally, the length of the guide slide is greater than the opening of the rolling mill.

[0009] Optionally, a wear-resistant slide plate is installed on the side of the bending roll block close to the working roll assembly.

[0010] Optionally, the bending roller block is fixed to the mounting surface by bolts, and the bending roller block has a fitting surface that fits with the mounting surface, and two blocks are respectively provided at both ends of the fitting surface along the length direction of the frame, and the two blocks are respectively fitted with the two end surfaces of the column along the length direction of the frame.

[0011] Optionally, the bending roll block has an outer end face away from the other column group; the large-aperture medium plate rolling mill bending roll system also includes an axial end clamping plate, which is movably installed on the outer end face of the bending roll block along the width direction of the frame, and the axial end clamping plate is used to move relative to the bending roll block to stop or avoid the working roll assembly.

[0012] Optionally, the shaft end clamp is provided with an elongated hole extending along the width direction of the frame, a connecting bolt is movably passed through the elongated hole, and the end of the connecting bolt is fixedly connected to the bending roller block; a clamping cylinder is installed on the bending roller block, and the clamping cylinder is drivingly connected to the shaft end clamp, for driving the shaft end clamp to move relative to the bending roller block along the width direction of the frame.

[0013] Optionally, the two column groups are respectively an operating side column group and a transmission side column group, the two columns of the operating side column group are respectively a first entrance column and a first exit column, the two columns of the transmission side column group are respectively a second entrance column and a second exit column, the second entrance column and the first entrance column are respectively arranged opposite to each other along the length direction of the frame, and the second exit column and the first exit column are arranged opposite to each other along the length direction of the frame; the large aperture medium plate rolling mill bending roll system also includes a first frame roller assembly, the two ends of the first frame roller assembly are respectively connected to the first entrance column and the second entrance column, including three first frame rollers arranged in sequence along the width direction of the frame, the second entrance column is provided with three first through holes which are respectively horizontally opposite to the axial ends of the three first frame rollers, the first through holes are penetrated with a first transmission shaft, one end of the three first transmission shafts is connected to the three first frame rollers, and the other end is connected to the three first motors.

[0014] Optionally, the large aperture medium plate rolling mill bending roll system also includes a second frame roller assembly, the two ends of the second frame roller assembly are respectively connected to the first outlet column and the second outlet column, including three second frame rollers arranged in sequence along the width direction of the frame, the second outlet column is provided with three second through holes horizontally opposite to the axial ends of the three second frame rollers, a second transmission shaft is passed through the second through hole, one end of the three second transmission shafts is connected to the three second frame rollers, and the other end is connected to three second motors.

[0015] In a second aspect, the present invention provides a medium plate rolling mill with a large aperture, comprising the large aperture medium plate rolling mill roll bending system as described above.

[0016] The beneficial effects of the large-opening medium plate rolling mill bending roll system of the present invention are as follows: a bending roll block is installed on the mounting surface of each column of the two column groups, and an upper bending roll cylinder arranged up and down is installed on the upper end of the bending roll block, and the mounting protrusion of the working roll assembly is connected to the upper end of the upper bending roll cylinder, so that the upper bending roll cylinder can directly drive the working roll assembly to rise and fall to adjust the mill opening when it is in action, without the need to synchronously drive the guide cover, thereby reducing the load on the upper bending roll cylinder; at the same time, a guide slide is also installed on the mounting surface, and the guide slide cooperates with the mounting protrusion guide, so that the guide slide can provide a guiding effect for the lifting and lowering of the working roll assembly, so that the present bending roll system directly sets a guide slide on the mounting surface of the column to provide guidance, thereby eliminating the setting of the guide cover in the bending roll block assembly, and can relatively reduce the volume of the bending roll block assembly, thereby improving its structural compactness. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a roll bending system for a medium plate rolling mill with a large opening according to an embodiment of the present invention;

[0018] Figure 2 It is a cross-sectional view of a roll bending system of a medium plate rolling mill with a large opening according to an embodiment of the present invention at the position of a roll bending block;

[0019] Figure 3 It is a top view of a roll bending system of a medium plate mill with a large opening according to an embodiment of the present invention;

[0020] Figure 4 for Figure 3 An enlarged schematic diagram of a part A of the roll bending system of a medium plate mill with medium to large opening;

[0021] Figure 5 It is a rear view of a roll bending system of a medium plate mill with a large opening according to an embodiment of the present invention;

[0022] Figure 6 It is a front view of a roll bending system for a medium plate mill with a large opening according to an embodiment of the present invention;

[0023] Figure 7It is a cross-sectional view of the bending roll system of a medium plate rolling mill with a large opening at the position of the shaft end clamping plate according to an embodiment of the present invention.

[0024] Description of reference numerals:

[0025] 1. Working roll assembly; 11. Mounting convex block; 2. Column group; 21. Column; 211. Mounting plate; 22. Operation side column group; 221. First entrance column; 222. First exit column; 23. Transmission side column group; 231. Second entrance column; 2311. First through hole; 232. Second exit column; 2321. Second through hole; 3. Bending roll block; 31. Upper bending roll cylinder; 32. Lower bending roll cylinder; 33. Wear-resistant slide plate; 34. Fitting surface; 35. Stopper; 4. Guide slide plate; 5. Support roll assembly; 6. Shaft end clamp plate; 61. Long hole; 611. Connecting bolt; 7. First frame roll; 8. Second frame roll. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be interpreted as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0027] The Z axis in the drawings represents the vertical direction, that is, the up and down position, and the positive direction of the Z axis represents the top, and the reverse direction of the Z axis represents the bottom; the X axis in the drawings represents the horizontal direction, and is designated as the front and back position, and the positive direction of the X axis represents the front side, and the reverse direction of the X axis represents the back side; the Y axis in the drawings represents the left and right position, and the positive direction of the Y axis represents the left side, and the reverse direction of the Y axis represents the right side. It should also be noted that the aforementioned Z axis, Y axis, and X axis are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0029] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0030] The present invention provides a large aperture medium plate rolling mill roll bending system and a large aperture medium plate rolling mill, so as to reduce the volume of the roll bending block assembly in the large aperture medium plate rolling mill.

[0031] like Figure 1 and Figure 2 As shown, a large-aperture medium plate rolling mill bending system provided by an embodiment of the present invention comprises a frame and a working roll assembly 1; the frame comprises two column groups 2 spaced apart along the length direction, the column group 2 comprises two columns 21 spaced apart along the width direction of the frame, in the column group 2, one of the columns 21 has a mounting surface close to the other column 21, a bending roll block 3 and a guide slide 4 are mounted on the mounting surface, an upper bending roll cylinder 31 arranged up and down is mounted on the upper end of the bending roll block 3, the guide slide 4 is located above the bending roll block 3 and extends up and down; the working roll assembly 1 is arranged on the frame and arranged along the length direction of the frame, the end of the working roll assembly 1 extends between the two columns 21 of the column group 2, a mounting protrusion 11 is provided on the circumferential side of the end of the working roll assembly 1, the mounting protrusion 11 is connected to the upper end of the upper bending roll cylinder 31 and is guided and matched with the guide slide 4.

[0032] It should be noted that the length direction of the rack is Figure 1 The X-axis direction is shown, and the width direction of the rack is Figure 1The Y-axis direction is shown. It can be understood that in the column group 2, one column 21 has a mounting surface close to another column 21, that is, in each column group 2, the side of the column 21 close to another column 21 is the mounting surface, and the bending roll block 3 and the guide slide 4 are installed on the mounting surface, that is, the bending roll block 3 and the guide slide 4 are installed on the mounting surfaces of the four columns 21. It can also be understood that the mounting protrusion 11 is guided and matched with the guide slide 4, which will make the mounting protrusion 11 slide up and down along the guide slide 4 when the upper bending roll cylinder 31 drives the working roll assembly 1 to rise and fall, so that the guide slide 4 in turn forms a guiding effect on the lifting process of the working roll assembly 1. Specifically, the working roll assembly 1 may include two bearing seats and working rolls rotatably mounted on the two bearing seats at both ends, and the mounting protrusion 11 may be formed on the peripheral side of the bearing seat. Specifically, the lower end of the bending roll block 3 can be installed with a lower bending roll cylinder 32 arranged up and down. The large-opening medium plate rolling mill bending roll system can also include a support roll assembly 5. The end of the support roll assembly 5 extends between the two columns 21 of the column group 2. The support roll assembly 5 is connected to the lower end of the lower bending roll cylinder 32. The upper bending roll cylinder 31 and the lower bending roll cylinder 32 can be used to apply bending roll force to the working roll assembly 1 and the support roll assembly 5 respectively, so as to realize the plate shape control of the rolled steel plate.

[0033] In this embodiment, a bending roll block 3 is installed on the mounting surface of each column 21 of the two column groups 2, and an upper bending roll cylinder 31 arranged up and down is installed on the upper end of the bending roll block 3, and the mounting protrusion 11 of the working roll assembly 1 is connected to the upper end of the upper bending roll cylinder 31, so that the upper bending roll cylinder 31 can directly drive the working roll assembly 1 to rise and fall to adjust the opening degree of the rolling mill when it is in action, without the need to synchronously drive the guide cover, thereby reducing the load on the upper bending roll cylinder 31; at the same time, a guide slide plate 4 is also installed on the mounting surface, and the guide slide plate 4 is guided and matched with the mounting protrusion 11, so that the guide slide plate 4 can provide a guiding effect for the lifting and lowering of the working roll assembly 1, so that the present bending roll system is to directly set the guide slide plate 4 on the mounting surface of the column 21 to provide guidance, thereby eliminating the setting of the guide cover in the bending roll block 3 assembly, which can relatively reduce the volume of the bending roll block 3 assembly and improve its structural compactness.

[0034] Alternatively, if Figure 2 As shown, a mounting plate 211 is detachably mounted on the mounting surface above the bending roller block 3 ; the guide slide plate 4 is fixedly mounted on the mounting plate 211 .

[0035] It should be noted that the present application does not limit the specific implementation method of the detachable installation of the mounting plate 211 on the mounting surface, for example, a bolt connection method may be used.

[0036] It is understandable that after the bending roller system is used for a long time, the installation protrusion 11 will cause certain wear to the guide slide 4, thereby affecting the guide accuracy. In this optional embodiment, the installation plate 211 is detachably installed on the installation surface, and the guide slide 4 is fixed to the installation plate 211. In this way, after the guide slide 4 is greatly worn, the installation plate 211 and the guide slide 4 can be removed from the installation surface, which is convenient for the maintenance and replacement of the guide slide 4 and ensures the guide accuracy.

[0037] Optionally, the length of the guide slide plate 4 is greater than the opening of the rolling mill.

[0038] In this optional embodiment, the length of the guide slide 4 is greater than the opening of the rolling mill, which can ensure that the mounting protrusion 11 is always in contact with the guide slide 4 when the working roll assembly 1 is raised or lowered, thereby improving the guiding effect.

[0039] Alternatively, if Figure 2 As shown, a wear-resistant slide plate 33 is installed on the side of the bending roll block 3 close to the working roll assembly 1.

[0040] Specifically, the wear-resistant sliding plate 33 may be made of a wear-resistant material.

[0041] In this optional embodiment, the wear-resistant slide plate 33 can replace the bending roll block 3 to contact the working roll assembly 1, so as to avoid the working roll assembly 1 directly rubbing against the bending roll block 3 and causing wear of the bending roll block 3.

[0042] Alternatively, if Figure 3 and Figure 4 As shown, the bending roller block 3 is fixed to the mounting surface by bolts, and the bending roller block 3 has a fitting surface 34 fitted with the mounting surface, and two blocks 35 are respectively provided at both ends of the fitting surface 34 along the length direction of the frame, and the two blocks 35 are respectively fitted with the two end surfaces of the column 21 along the length direction of the frame.

[0043] In this optional embodiment, the fitting surface 34 fits with the installation surface, and the two blocks 35 fit with the two end surfaces of the column 21 along the length direction of the frame respectively. In this way, when the bending roller block 3 is installed to the column 21, it can be positioned by the fitting surface 34 and the two blocks 35 to ensure that the bending roller block 3 has a correct position on the column 21, thereby improving the installation accuracy.

[0044] Alternatively, if Figure 1 , Figure 5 and Figure 6As shown, the bending roll block 3 has an outer end face away from the other column group 2; the large aperture medium plate rolling mill bending roll system also includes an axial end clamping plate 6, which is movably installed on the outer end face of the bending roll block 3 along the width direction of the frame, and the axial end clamping plate 6 is used to move relative to the bending roll block 3 to stop or avoid the working roll assembly 1.

[0045] Specifically, the two column groups 2 are respectively an operating side column group 22 and a transmission side column group 23 , and the shaft end clamping plate 6 can be installed on the bending roller block 3 of the column 21 of the operating side column group 22 .

[0046] In this optional embodiment, the shaft end clamp 6 can be moved relative to the bending roll block 3 to stop or avoid the working roll assembly 1. In this way, after the working roll assembly 1 is installed on the bending roll block 3, the shaft end clamp 6 can be driven to move to stop the end face of the working roll assembly 1, thereby limiting the axial position of the working roll assembly 1 and preventing the working roll assembly 1 from axial movement when the rolling mill is working.

[0047] Alternatively, if Figure 5 As shown, the shaft end clamping plate 6 is provided with an elongated hole 61 extending along the width direction of the frame, and a connecting bolt 611 is movably passed through the elongated hole 61, and the end of the connecting bolt 611 is fixedly connected to the bending roller block 3; a clamping plate cylinder is installed on the bending roller block 3, and the clamping plate cylinder is drivingly connected to the shaft end clamping plate 6, and is used to drive the shaft end clamping plate 6 to move relative to the bending roller block 3 along the width direction of the frame.

[0048] It should be noted that the connection bolt 611 is movably inserted into the elongated hole 61 , which means that the connection bolt 611 can move along the length direction of the elongated hole 61 (ie, the width direction of the frame).

[0049] In this optional embodiment, since a connecting bolt 611 is movably inserted into the elongated hole 61 of the shaft end clamping plate 6, and the end of the connecting bolt 611 is fixedly connected to the bending roller block 3, when the clamping plate cylinder drives the shaft end clamping plate 6 to move, the connecting bolt 611 can guide the movement of the shaft end clamping plate 6, thereby avoiding the jamming of the clamping plate due to external force, and making the movement of the clamping plate smoother.

[0050] Alternatively, if Figure 1 , Figure 3 and Figure 7As shown, the two column groups 2 are respectively an operating side column group 22 and a transmission side column group 23, the two columns 21 of the operating side column group 22 are respectively a first entrance column 221 and a first exit column 222, the two columns 21 of the transmission side column group 23 are respectively a second entrance column 231 and a second exit column 232, the second entrance column 231 and the first entrance column 221 are arranged opposite to each other along the length direction of the frame, and the second exit column 232 and the first exit column 222 are arranged opposite to each other along the length direction of the frame; The large aperture medium plate rolling mill bending roll system also includes a first frame roller assembly, the two ends of which are respectively connected to the first entrance column 221 and the second entrance column 231, including three first frame rollers 7 arranged in sequence along the width direction of the frame, the second entrance column 231 is provided with three first through holes 2311 horizontally opposite to the axial ends of the three first frame rollers 7, the first through holes 2311 are penetrated by a first transmission shaft, one end of the three first transmission shafts is connected to the three first frame rollers 7, and the other end is connected to three first motors.

[0051] In this optional embodiment, the first transmission shaft is connected to the first frame roller 7 through the first through hole 2311. When the first frame roller 7 needs to be replaced, the first transmission shaft detached from the first frame roller 7 can be quickly pulled out of the first through hole 2311, thereby facilitating the replacement of the first frame roller 7 and improving the replacement efficiency of the first frame roller 7; and, the three first transmission shafts are respectively connected to the three first motors, forming a separate transmission of the three first frame rollers 7. If a first motor fails, the separate transmission can enable the other first frame rollers 7 to continue working, thereby reducing the shutdown frequency of the rolling mill.

[0052] Alternatively, if Figure 1 , Figure 3 and Figure 7 As shown, the large aperture medium plate rolling mill bending roll system also includes a second frame roller assembly, the two ends of the second frame roller assembly are respectively connected to the first outlet column 222 and the second outlet column 232, including three second frame rollers 8 arranged in sequence along the width direction of the frame, the second outlet column 232 is provided with three second through holes 2321 which are horizontally opposite to the axial ends of the three second frame rollers 8, and the second through holes 2321 are penetrated by a second transmission shaft, one end of the three second transmission shafts is connected to the three second frame rollers 8, and the other end is connected to three second motors.

[0053] In this optional embodiment, the second transmission shaft is connected to the second frame roller 8 through the second through hole 2321. When the second frame roller 8 needs to be replaced, the second transmission shaft detached from the second frame roller 8 can be quickly pulled out of the second through hole 2321, thereby facilitating the replacement of the second frame roller 8 and improving the replacement efficiency of the second frame roller 8; and, the three second transmission shafts are respectively connected to the three second motors, forming a separate transmission of the three second frame rollers 8. If a second motor fails, the separate transmission can enable the other second frame rollers 8 to continue working, thereby reducing the shutdown frequency of the rolling mill.

[0054] An embodiment of the present invention provides a medium plate rolling mill with a large aperture, comprising the large aperture medium plate rolling mill roll bending system as described above.

[0055] In this embodiment, since the large aperture medium plate rolling mill includes the above-mentioned large aperture medium plate rolling mill roll bending system, it has the beneficial effects brought by the large aperture medium plate rolling mill roll bending system of all the above-mentioned embodiments, which will not be described one by one here.

[0056] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A roll bending system for a medium plate mill with a large opening, characterized in that: The invention comprises a frame and a working roll assembly (1); the frame comprises two column groups (2) arranged at intervals along the length direction; the column group (2) comprises two columns (21) arranged at intervals along the width direction of the frame; in the column group (2), one of the columns (21) has a mounting surface close to the other column (21); a bending roll block (3) and a guide slide plate (4) are mounted on the mounting surface; an upper bending roll cylinder (31) arranged up and down is mounted on the upper end of the bending roll block (3); The guide slide plate (4) is located above the bending roll block (3) and extends upward and downward; the working roll assembly (1) is arranged on the frame and arranged along the length direction of the frame, and the end of the working roll assembly (1) extends between the two columns (21) of the column group (2). A mounting protrusion (11) is provided on the circumferential side of the end of the working roll assembly (1), and the mounting protrusion (11) is connected to the upper end of the upper bending roll cylinder (31) and is guided and matched with the guide slide plate (4).

2. The large aperture medium plate mill roll bending system according to claim 1 is characterized in that: A mounting plate (211) is detachably mounted on the mounting surface at a position above the bending roller block (3); the guide slide plate (4) is fixedly mounted on the mounting plate (211).

3. The large aperture medium plate mill roll bending system according to claim 1 is characterized in that: The length of the guide slide plate (4) is greater than the opening of the rolling mill.

4. The large aperture medium plate mill roll bending system according to claim 1 is characterized in that: A wear-resistant slide plate (33) is installed on the side of the bending roll block (3) close to the working roll assembly (1).

5. The large aperture medium plate mill roll bending system according to claim 1 is characterized in that: The bending roller block (3) is fixed to the mounting surface by bolts, and the bending roller block (3) has a fitting surface (34) fitted with the mounting surface, and two stoppers (35) are respectively provided at both ends of the fitting surface (34) along the length direction of the frame, and the two stoppers (35) are respectively fitted with the two end surfaces of the column (21) along the length direction of the frame.

6. The large aperture medium plate mill roll bending system according to claim 1 is characterized in that: The bending roll block (3) has an outer end face away from the other column group (2); the large aperture medium plate rolling mill bending roll system also includes an axial end clamping plate (6), the axial end clamping plate (6) is movably installed on the outer end face of the bending roll block (3) along the width direction of the frame, and the axial end clamping plate (6) is used to move relative to the bending roll block (3) to stop or avoid the working roll assembly (1).

7. The large aperture medium plate mill roll bending system according to claim 6 is characterized in that: The shaft end clamping plate (6) is provided with an elongated hole (61) extending in the width direction of the frame, and a connecting bolt (611) is movably inserted into the elongated hole (61), and the end of the connecting bolt (611) is fixedly connected to the bending roller block (3); a clamping plate cylinder is installed on the bending roller block (3), and the clamping plate cylinder is drivingly connected to the shaft end clamping plate (6) and is used to drive the shaft end clamping plate (6) to move relative to the bending roller block (3) along the width direction of the frame.

8. The large aperture medium plate mill roll bending system according to claim 1 is characterized in that: The two column groups (2) are respectively an operating side column group (22) and a transmission side column group (23); the two columns (21) of the operating side column group (22) are respectively a first entrance column (221) and a first exit column (222); the two columns (21) of the transmission side column group (23) are respectively a second entrance column (231) and a second exit column (232); the second entrance column (231) and the first entrance column (221) are arranged opposite to each other along the length direction of the frame; the second exit column (232) and the first exit column (222) are arranged opposite to each other along the length direction of the frame. The large aperture medium plate rolling mill bending roll system further comprises a first frame roll assembly, the two ends of the first frame roll assembly are respectively connected to the first entrance column (221) and the second entrance column (231), and comprises three first frame rolls (7) arranged in sequence along the width direction of the frame, the second entrance column (231) is provided with three first through holes (2311) which are respectively horizontally opposite to the axial ends of the three first frame rolls (7), the first through holes (2311) are penetrated by a first transmission shaft, one end of the three first transmission shafts is connected to the three first frame rolls (7), and the other end is connected to the three first motors.

9. The large aperture medium plate mill roll bending system according to claim 8, characterized in that: The large aperture medium plate rolling mill roll bending system also includes a second frame roll assembly, the two ends of the second frame roll assembly are respectively connected to the first outlet column (222) and the second outlet column (232), and include three second frame rolls (8) arranged in sequence along the width direction of the frame, the second outlet column (232) is provided with three second through holes (2321) which are horizontally opposite to the axial ends of the three second frame rolls (8), and a second transmission shaft is passed through the second through hole (2321), one end of the three second transmission shafts is connected to the three second frame rolls (8), and the other end is connected to the three second motors.

10. A medium plate rolling mill with a large opening, characterized in that: It comprises a large aperture medium plate mill roll bending system as described in any one of claims 1 to 9.

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