Roll changing balancing device and rolling mill

Abstract

The utility model provides a roll changing balancing device and a rolling mill, and relates to the technical field of steel rolling equipment, the roll changing balancing device comprises a clamping plate structure and a driving device, the clamping plate structure comprises a clamping plate movably arranged on an upper cross beam, and a first clamping part and a second clamping part which are convexly arranged on the clamping plate, the arrangement height of the first clamping part is larger than that of the second clamping part, the first clamping part can be used for moving to the position below the carrying pole beam located at the first height and supporting the carrying pole beam, and the second clamping part can be used for moving to the position below the carrying pole beam located at the second height and supporting the carrying pole beam; the driving device is arranged on the upper cross beam, is in transmission connection with the clamping plate structure and is used for pushing the clamping plate structure to move to the position below the carrying pole beam. Through the design of the double-height clamping parts, equipment accidents and operator safety accidents caused by different roller changing heights of the carrying pole beam are effectively prevented, and the safety during roller changing of the rolling mill is ensured.

Description

Technical Field

[0001] This utility model relates to the field of steel rolling equipment technology, and in particular to a roll changing balancing device and a rolling mill. Background Technology

[0002] Rolling mills are indispensable key equipment in the metallurgical industry, and their performance and precision directly affect the quality of the final product and production efficiency. During the rolling process, the upper support roll balancing device plays a crucial role. This device is mainly used to lift the upper support roll assembly and the upper guide assembly, balance the weight of the moving parts in the upper part of the mill, eliminate clearances, and ensure the stability and precision of the rolling process. The upper support roll balancing device of a rolling mill typically has single-cylinder, double-cylinder, and multi-cylinder balancing structures. For general large rolling mills, the upper support roll balancing device is installed on the upper crossbeam of the mill. The main functions of the upper support roll balancing device include: when adjusting the mill opening, allowing the upper support roll system and the upper guide system to rise or fall together with the upper support roll balancing device to accommodate different specifications of rolled workpieces; balancing the weight of the moving parts in the upper part of the mill; eliminating clearances between mating parts in the mill stand; preventing impact vibrations caused by their own weight; and thus improving equipment life and rolling accuracy.

[0003] When the rolling mill is unloaded, the weight of each component causes clearances in areas such as the press screw and nut, the press screw and thrust bearing, and the support roll journal and bearing. These clearances generate strong impact vibrations during steel biting and throwing, especially at high speeds, leading to reduced lifespan of mill components, changes in roll gap, and reduced control accuracy. To eliminate these adverse factors, existing medium and heavy plate rolling mills generally employ hydraulic balancing devices. However, during roll changing or maintenance, the operation time is often long, and leaks may occur in the hydraulic or pneumatic systems, making it difficult to maintain a stable position. This can cause deviations from the required roll changing position, resulting in difficulties in roll changing, equipment accidents, and operator safety incidents.

[0004] Furthermore, the slab dimensions of traditional hot continuous rolling and medium-thick plate rolling are relatively thin, with specifications generally between 200mm and 320mm. Even for medium-thick slabs, the dimensions can be controlled to around 450mm. Therefore, in this case, when the mill opening is between 450mm and 550mm, the support rolls and work rolls can be changed at the same height through design, which is sufficient to meet process requirements. However, with the increasing demand for thicker slabs from various industries, the thickness of these slabs has increased significantly, with specifications ranging from 800mm to 900mm, and some even exceeding 1000mm. This means that the traditional 450mm-550mm mill opening cannot meet the rolling requirements of these types of workpieces, and the mill opening must be increased. For the large-opening mills required for rolling ultra-thick slabs, the support rolls and work rolls need to be changed at different heights, and the current structure cannot meet its operational requirements. Therefore, how to better ensure the positional stability of the upper support roll and work roll when changing rolls at different heights has become an urgent technical problem to be solved. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a roll changing balancing device and a rolling mill, so as to better ensure the positional stability of the upper support roll and the work roll when changing rolls at different heights.

[0006] The above-mentioned objective of this utility model can be achieved by the following technical solution: This utility model provides a roll changing balancing device, which is installed on the upper crossbeam of a rolling mill, comprising:

[0007] The clamping plate structure includes a clamping plate movably disposed on the upper crossbeam, and a first locking part and a second locking part protruding from the clamping plate. The setting height of the first locking part is greater than the setting height of the second locking part. The first locking part can be used to move to below the spreader beam at a first height and support the spreader beam. The second locking part can be used to move to below the spreader beam at a second height and support the spreader beam.

[0008] A driving device is disposed on the upper crossbeam and is tractably connected to the clamping plate structure. The driving device is used to push the clamping plate structure to move below the spreader beam.

[0009] In a preferred embodiment of the present invention, the roller changing balancing device further includes a guide structure, which is disposed between the clamping plate structure and the upper crossbeam. At least a portion of the movement path of the guide structure is located below the spreader beam, and the guide structure is used to guide the clamping plate.

[0010] In a preferred embodiment of the present invention, the guide structure includes a guide rail disposed on the upper crossbeam, and the locking plate is slidably engaged with the guide rail.

[0011] In a preferred embodiment of the present invention, the first locking portion and the second locking portion are spaced apart on the card plate along the extending direction of the guide rail.

[0012] In a preferred embodiment of the present invention, the card plate includes a card plate body, and a first pad and a second pad protruding on the card plate body. The top surface of the first pad forms a first locking portion, and the top surface of the second pad forms a second locking portion.

[0013] In a preferred embodiment of the present invention, the card plate structure further includes a positioning block, which is disposed on the first locking part and placed in the gap between the first locking part and the second locking part, and the positioning block has a positioning end face on the side near the second locking part.

[0014] In a preferred embodiment of the present invention, the positioning block is formed of a non-metallic material, which includes either rubber or nylon.

[0015] In a preferred embodiment of the present invention, the first locking part is disposed between the second locking part and the driving device.

[0016] In a preferred embodiment of the present invention, the second locking part is disposed between the first locking part and the driving device.

[0017] In a preferred embodiment of the present invention, the driving device includes a driving cylinder, a mounting seat is provided on the upper crossbeam, the driving cylinder is rotatably connected to the mounting seat, and the piston rod of the driving cylinder is rotatably connected to the clamping plate.

[0018] In a preferred embodiment of this utility model, the drive cylinder is a hydraulic cylinder or a pneumatic cylinder.

[0019] In a preferred embodiment of the present invention, the roller changing balancing device further includes a position detection module, which is disposed on the upper crossbeam and is used to obtain the position information of the card plate structure.

[0020] In a preferred embodiment of the present invention, the position detection module includes one or more combinations of a proximity switch, a displacement sensor, or an encoder.

[0021] In a preferred embodiment of the present invention, the roller changing balancing device further includes a fixing plate, which is disposed on the side of the clamping plate structure and is used to install the position detection module.

[0022] This utility model also provides a rolling mill, including an upper crossbeam, a spreader beam, and at least one of the aforementioned roll changing balancing devices. The spreader beam is located above the upper crossbeam, and the bottom of the spreader beam has a third locking part. The first locking part is used to support the third locking part when the support roll is changed, and the second locking part is used to support the third locking part when the work roll is changed.

[0023] In a preferred embodiment of the present invention, the rolling mill includes a lifting hydraulic cylinder disposed on the upper crossbeam, and two roll changing balancing devices are provided, with the two roll changing balancing devices respectively disposed on both sides of the lifting hydraulic cylinder.

[0024] In a preferred embodiment of the present invention, the rolling mill includes two lifting hydraulic cylinders disposed on the upper crossbeam, and the roll changing balancing device is provided and disposed between the two lifting hydraulic cylinders.

[0025] In a preferred embodiment of this utility model, the rolling mill is a strip rolling mill.

[0026] The technical solution of this utility model has the following significant beneficial effects:

[0027] When in use, the roll changing balancing device of this invention is installed on the upper crossbeam of the rolling mill. During the roll changing process, the clamping plate structure and the driving device work together to provide stable support for the spreader beam of the rolling mill, thereby significantly improving the stability and safety of the roll changing process. Specifically, the clamping plate is provided with a first locking part and a second locking part. By setting the first locking part and the second locking part at different heights, when changing the support roll or the work roll, the first locking part and the second locking part support the spreader beam at different heights respectively, ensuring precise support under different roll changing requirements, thereby improving the stability and safety of the roll changing process. Furthermore, the driving device can push the clamping plate structure to move below the spreader beam, ensuring the positional accuracy and stability of the clamping plate structure during the roll changing process.

[0028] This invention, through its double-height locking design, effectively prevents equipment accidents and operator safety incidents caused by differences in roll changing height on the spreader beam, ensuring safety during roll changing in the rolling mill. This invention better meets the roll changing requirements of rolling mills with large openings during ultra-thick slab rolling, ensuring the fixed position of the hydraulic cylinder during both work roll and support roll changes, avoiding roll changing malfunctions and operational safety accidents caused by the hydraulic cylinder disengaging from its position. Furthermore, the automated control drive device facilitates automated roll changing operations, significantly improving rolling mill performance and roll changing efficiency, and has broad application prospects. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0031] Figure 1 This is a three-dimensional structural diagram of one embodiment of the roller changing and balancing device of this utility model;

[0032] Figure 2 This is a side view of one embodiment of the roller changing and balancing device of this utility model.

[0033] Figure 3 This is a side view of an embodiment of the present invention in which the second locking part supports the work roll during the work roll change.

[0034] Figure 4 This is a side view of an embodiment of the present invention in which the first locking part supports the support roller during roller changing;

[0035] Figure 5 This is a front view schematic diagram of an embodiment of the two roll changing balancing devices of the present invention installed on a rolling mill with a single lifting hydraulic cylinder;

[0036] Figure 6This is a front view schematic diagram of an embodiment of the roll changing balancing device of the present invention installed on a rolling mill with dual lifting hydraulic cylinders;

[0037] Figure 7 This is a side view of another embodiment of the roller changing and balancing device of this utility model;

[0038] Figure 8 This is a side view of another embodiment of the present invention, in which the second locking part supports the work roll during the work roll change.

[0039] Figure 9 This is a side view of another embodiment of the present invention, in which the first locking part supports the support roller during roller changing.

[0040] The reference numerals in the above figures are as follows:

[0041] 10. Rolling mill;

[0042] 11. Upper crossbeam;

[0043] 12. Carrying pole beam;

[0044] 13. Lifting hydraulic cylinder;

[0045] 20. Roller changing and balancing device;

[0046] 100. Card plate structure; 110. First locking part; 120. Second locking part; 130. Positioning block;

[0047] 200. Drive unit; 210. Drive cylinder; 220. Mounting base;

[0048] 300. Guide structure; 310. Guide rail;

[0049] 400. Position detection module;

[0050] 500. Fixed plate. Detailed Implementation

[0051] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0052] Implementation Method 1

[0053] Please refer to the following: Figures 1 to 9As shown, an embodiment of this utility model provides a roll changing balancing device 20, which is used to be installed on the upper crossbeam 11 of the rolling mill 10. The roll changing balancing device 20 includes a clamping plate structure 100 and a driving device 200. The clamping plate structure 100 includes a clamping plate movably installed on the upper crossbeam 11, and a first locking part 110 and a second locking part 120 protruding on the clamping plate. The setting height of the first locking part 110 is greater than the setting height of the second locking part 120. The first locking part 110 can be used to move to below the spreader beam 12 at a first height and support the spreader beam 12. The second locking part 120 can be used to move to below the spreader beam 12 at a second height and support the spreader beam 12. The driving device 200 is installed on the upper crossbeam 11 and is tractably connected to the clamping plate structure 100. The driving device 200 is used to push the clamping plate structure 100 to move to below the spreader beam 12.

[0054] Overall, the roll changing balancing device 20 is mounted on the upper crossbeam 11 of the rolling mill 10. During roll changing, the clamping plate structure 100 and the drive device 200 work together to provide stable support for the spreader beam 12, thereby significantly improving the stability and safety of the roll changing process. Specifically, the clamping plate is provided with a first locking part 110 and a second locking part 120. By setting the first locking part 110 and the second locking part 120 at different heights, when changing the support roll or the work roll, the first locking part 110 and the second locking part 120 support the spreader beam 12 at different heights respectively, ensuring precise support under different roll changing requirements, thereby improving the stability and safety of the roll changing process. Furthermore, the drive device 200 can push the clamping plate structure 100 to move below the spreader beam 12, ensuring the positional accuracy and stability of the clamping plate structure 100 during roll changing.

[0055] This invention, through its double-height locking design, effectively prevents equipment accidents and operator safety incidents caused by differences in the roll changing height of the spreader beam 12, ensuring safety during roll changing in the rolling mill 10. This invention better meets the roll changing requirements of the rolling mill 10 at large openings during ultra-thick slab rolling, ensuring the fixed position of the lifting hydraulic cylinder 13 during both work roll and support roll changes, preventing roll changing malfunctions and operational safety accidents caused by the lifting hydraulic cylinder 13 disengaging from its position. Furthermore, the automated control drive device 200 facilitates automated roll changing operations, significantly improving the performance and roll changing efficiency of the rolling mill 10, and has broad application prospects.

[0056] Designers can adjust the specific dimensions of the first and second heights according to usage needs; no specific restrictions are imposed here. The first height is greater than the second height.

[0057] In the embodiments of this utility model, such as Figure 1 and Figure 2 In the embodiment shown, the roller changing balancing device 20 further includes a guide structure 300, which is disposed between the pallet structure 100 and the upper crossbeam 11. At least a portion of the movement path of the guide structure 300 is located below the spreader beam 12, and the guide structure 300 is used to guide the pallet.

[0058] The guide structure 300 provides a stable movement trajectory for the pallet, ensuring that it will not deviate or tilt during movement, thereby ensuring that the pallet can accurately reach the predetermined position to support the spreader beam 12.

[0059] Designers can adjust the specific shape and structure of the guide structure 300 according to usage needs, and no specific restrictions are imposed here. Preferably, the guide structure 300 includes a guide rail 310 disposed on the upper crossbeam 11, and the locking plate is slidably engaged with the guide rail 310.

[0060] Specifically, such as Figure 1 and Figure 2 In the illustrated embodiment, a slider structure is formed at the bottom of the card plate, and a groove structure is provided on the guide rail 310. The slider structure and the groove structure are slidably engaged. The cooperation between the slider structure and the groove structure allows the card plate to quickly reach the designated position under the action of the driving device 200.

[0061] In the embodiments of this utility model, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 In the embodiment shown, the first locking portion 110 and the second locking portion 120 are spaced apart on the plate along the extending direction of the guide rail 310.

[0062] By arranging the first locking part 110 and the second locking part 120 at intervals along the extension direction of the guide rail 310, the movement stroke of the drive device 200 can be controlled to precisely control the movement position of the first locking part 110 and the second locking part 120, thereby enabling the first locking part 110 or the second locking part 120 to support the spreader beam 12 located at different heights.

[0063] Furthermore, by spacing the first locking part 110 and the second locking part 120 apart, mutual interference between them is avoided. At the same time, a certain amount of redundant space is reserved between the first locking part 110 and the second locking part 120, preventing the first locking part 110 from accidentally colliding with the spreader beam 12. Designers can adjust the spacing between the first locking part 110 and the second locking part 120 according to usage requirements; no specific limitations are imposed here.

[0064] Specifically, such as Figure 1, Figure 2 , Figure 3 and Figure 4 In the embodiment shown, the card plate includes a card plate body and a first pad and a second pad protruding from the card plate body. The top surface of the first pad forms a first locking portion 110, and the top surface of the second pad forms a second locking portion 120.

[0065] Furthermore, such as Figure 2 , Figure 3 and Figure 4 In the embodiment shown, the card plate structure 100 further includes a positioning block 130, which is disposed on the first locking part 110 and placed in the gap between the first locking part 110 and the second locking part 120. The positioning block 130 has a positioning end face on the side near the second locking part 120.

[0066] When the drive device 200 pushes the second locking part 120 under the spreader beam 12, causing the spreader beam 12 to fall onto the second locking part 120 to lock the position of the spreader beam 12, the drive device 200 can drive the positioning end face of the positioning block 130 to abut against the spreader beam 12 and other equipment, thereby forming a roughly L-shaped contact end face.

[0067] By cooperating with the second locking part 120 and the positioning block 130, the roll changing position can be kept stable when the drive device 200 malfunctions, thereby providing better roll changing safety for the rolling mill 10.

[0068] Designers can adjust the specific structure and material of the positioning block 130 according to the usage requirements, and no specific restrictions are imposed here. Preferably, the positioning block 130 is constructed as a cuboid or a cylinder.

[0069] More preferably, the positioning stop 130 is formed of a non-metallic material, including either rubber or nylon. Rubber and nylon materials have good elasticity, effectively mitigating impact and preventing hard impacts.

[0070] Of course, in other feasible embodiments, the designer may adjust the specific material of the positioning block 130 according to the needs of use, and no specific restrictions are imposed here.

[0071] In one feasible embodiment of this utility model, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 In the embodiment shown, the first locking part 110 is disposed between the second locking part 120 and the driving device 200.

[0072] By placing the first locking part 110 between the second locking part 120 and the drive device 200, the roller changing balancing device 20 can be arranged as a whole on one side of the spreader beam 12, which helps to reduce the travel of the drive device 200.

[0073] When the drive device 200 pushes the pallet outward, the smaller second locking part 120 will move to the bottom of the spreader beam 12 first, and then the larger second locking part 120 will move to the bottom of the spreader beam 12.

[0074] In another feasible embodiment of this utility model, such as Figure 7 , Figure 8 and Figure 9 In the embodiment shown, the second locking part 120 is disposed between the first locking part 110 and the driving device 200.

[0075] By placing the second locking part 120 between the first locking part 110 and the driving device 200, the locking plate and the driving device 200 are respectively arranged on both sides of the spreader beam 12.

[0076] When the drive device 200 pulls the plate inward, the lower-height second locking part 120 will move to the bottom of the spreader beam 12 first, and then the higher-height second locking part 120 will move to the bottom of the spreader beam 12.

[0077] In the embodiments of this utility model, such as Figure 1 In the embodiment shown, the drive device 200 includes a drive cylinder 210, and a mounting base 220 is provided on the upper crossbeam 11. The drive cylinder 210 is rotatably connected to the mounting base 220, and the piston rod of the drive cylinder 210 is rotatably connected to the clamping plate.

[0078] Specifically, the drive cylinder 210 is hinged to the mounting base 220, and the piston rod of the drive cylinder 210 is hinged to the clamping plate. This rotary connection allows the drive cylinder 210 to have a certain adjustment margin during operation, preventing it from jamming and improving its movement flexibility, thus enabling it to better cope with complex working environments.

[0079] Designers can adjust the specific structure of the drive cylinder 210 according to usage requirements, and no specific limitations are imposed here. Preferably, the drive cylinder 210 is a hydraulic cylinder or a pneumatic cylinder. Of course, the drive device 200 can also be configured as other devices that have the same function as a hydraulic cylinder or a pneumatic cylinder, and no specific limitations are imposed here.

[0080] In the embodiments of this utility model, such as Figure 1 , Figure 2 and Figure 7In the embodiment shown, the roller changing balancing device 20 also includes a position detection module 400, which is disposed on the upper crossbeam 11 and is used to obtain the position information of the card plate structure 100.

[0081] The position detection module 400 can quickly feed back the position information to the control system, enabling the drive device 200 to quickly adjust its actions and precisely control the motion stroke according to the actual situation, thereby improving control accuracy and facilitating the realization of automated control.

[0082] Designers may construct the position detection module 400 according to the specific model used, without making specific limitations. Preferably, the position detection module 400 includes one or more combinations of proximity switches, displacement sensors, or encoders.

[0083] Furthermore, such as Figure 1 , Figure 2 and Figure 7 In the embodiment shown, the roller changing balancing device 20 also includes a fixing plate 500, which is disposed on the side of the plate structure 100 and is used to install the position detection module 400.

[0084] Specifically, the fixed clamping plate 500 is mounted on the guide rail 310 and positioned to the side of the clamping plate structure 100. By installing the position detection module 400 on the fixed clamping plate 500, the installation stability of the position detection module 400 is improved, thereby ensuring the motion accuracy of the drive device 200. Designers can adjust the shape and structure of the fixed clamping plate 500 according to usage requirements, and no specific restrictions are imposed here.

[0085] Implementation Method 2

[0086] Please refer to the following: Figures 1 to 9 As shown, an embodiment of the present invention provides a rolling mill 10, which includes an upper crossbeam 11, a spreader beam 12, and at least one roll changing balancing device 20 as described in Embodiment 1. The spreader beam 12 is located above the upper crossbeam 11, and the bottom of the spreader beam 12 has a third locking part. The first locking part 110 is used to support the third locking part when the support roll is changed, and the second locking part 120 is used to support the third locking part when the work roll is changed.

[0087] The specific structure, working principle, and beneficial effects of the roll changing balancing device 20 are the same as those in Embodiment 1, and will not be repeated here. By using the roll changing balancing device 20, the rolling mill 10 can meet the support needs of the work roll and the support roll during roll changing, thus providing better operational flexibility.

[0088] In one embodiment of this utility model, such as Figure 1 and Figure 5In the embodiment shown, the rolling mill 10 includes a lifting hydraulic cylinder 13 mounted on the upper crossbeam 11, and two roll changing balancing devices 20 are provided, which are respectively mounted on both sides of the lifting hydraulic cylinder 13.

[0089] By setting the two roller-changing balancing devices 20 on both sides of the lifting hydraulic cylinder 13, the force on the spreader beam 12 is more even, reducing the problem of skewing or imbalance caused by uneven force on one side.

[0090] In another embodiment of this utility model, such as Figure 6 In the embodiment shown, the rolling mill 10 includes two lifting hydraulic cylinders 13 mounted on the upper crossbeam 11, and a roll changing balancing device 20 is provided and positioned between the two lifting hydraulic cylinders 13.

[0091] In another embodiment of this utility model, the designer can adjust the number of roller changing and balancing devices 20 according to the needs of use, and no specific limitation is made here.

[0092] Designers may adjust the specific model and structure of the rolling mill 10 according to usage requirements, and no specific restrictions are imposed here. Preferably, the rolling mill 10 is a strip rolling mill 10.

[0093] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0094] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A roll changing balancing device for being arranged on an upper beam of a rolling mill, characterized in that, The roll changing balancing device comprises: a clamping plate structure, which comprises a clamping plate movably arranged on the upper cross beam, and a first clamping part and a second clamping part protruding from the clamping plate, the first clamping part is arranged higher than the second clamping part, the first clamping part is capable of moving to the lower side of the beam below the first height and supporting the beam, and the second clamping part is capable of moving to the lower side of the beam below the second height and supporting the beam; a driving device arranged on the upper cross beam, the driving device is in driving connection with the clamping plate structure, and the driving device is used to drive the clamping plate structure to move to the lower side of the beam.

2. The roll changing balancing device as claimed in claim 1, wherein The roll changing balancing device further comprises a guide structure arranged between the clamping plate structure and the upper cross beam, at least part of the movement path of the guide structure is below the beam, and the guide structure is used to guide the clamping plate.

3. The roll changing balancing device as claimed in claim 2, wherein The guide structure comprises a guide rail arranged on the upper cross beam, and the clamping plate is in slidable connection with the guide rail.

4. The roll changing balancing device as claimed in claim 3, wherein The first clamping part and the second clamping part are arranged on the clamping plate in the extension direction of the guide rail.

5. The roll changing balancing device as claimed in claim 4, wherein The clamping plate comprises a clamping plate body, and a first pad and a second pad protruding from the clamping plate body, the top surface of the first pad forms the first clamping part, and the top surface of the second pad forms the second clamping part.

6. The roll changing balancing device as claimed in claim 4, wherein The clamping plate structure further comprises a positioning stopper arranged on the first clamping part and located in the gap between the first clamping part and the second clamping part, and a positioning end face is arranged on the side close to the second clamping part.

7. The roll changing balancing device as claimed in claim 6, characterized in that The positioning stopper is formed by a non-metallic material, and the non-metallic material comprises one of rubber or nylon material.

8. The roll changing balancing device as claimed in claim 4, wherein The first clamping part is arranged between the second clamping part and the driving device.

9. The roll changing balancing device as claimed in claim 4, wherein The second clamping part is arranged between the first clamping part and the driving device.

10. The roll changing balancing device as claimed in claim 1, wherein The driving device comprises a driving cylinder, the upper cross beam is provided with a mounting seat, the driving cylinder is rotatably connected with the mounting seat, and the piston rod of the driving cylinder is rotatably connected with the clamping plate.

11. The roll changing balancing device as claimed in claim 10, wherein The driving cylinder is a hydraulic cylinder or a pneumatic cylinder.

12. The roll changing balancing device as claimed in claim 1, wherein The roll changing balancing device further comprises a position detection module arranged on the upper cross beam, and the position detection module is used to acquire the position information of the clamping plate structure.

13. The roll changing balancing device as claimed in claim 12, characterized in that The position detection module comprises one or more combinations of proximity switches, displacement sensors or encoders.

14. The roll changing balancing device as claimed in claim 12, wherein, The roll changing balancing device further comprises a fixed clamping plate arranged on the side of the clamping plate structure, and the fixed clamping plate is used to mount the position detection module.

15. A rolling mill, characterized in that The roll changing balancing device comprises an upper cross beam, a beam and at least one roll changing balancing device according to any one of claims 1 to 14, the beam is arranged above the upper cross beam, the bottom of the beam is provided with a third clamping part, the first clamping part is used to support the third clamping part when the supporting roll is changed, and the second clamping part is used to support the third clamping part when the working roll is changed.

16. Rolling mill according to claim 15, characterized in that The rolling mill comprises a lifting hydraulic cylinder arranged on the upper cross beam, and the roll changing balance device is provided with two roll changing balance devices arranged on both sides of the lifting hydraulic cylinder.

17. The rolling mill of claim 15, wherein The rolling mill comprises two lifting hydraulic cylinders arranged on the upper cross beam, and the roll changing balance device is provided with one roll changing balance device arranged between the two lifting hydraulic cylinders.

18. The rolling mill of claim 15, wherein, The rolling mill is a plate strip rolling mill.

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