Working roll changing structure of temper mill

Abstract

The invention relates to a temper mill working roll changing structure which comprises an operation side roll changing structure. The transmission side transverse-moving roll changing structure comprises a first transverse-moving roll changing part and a second transverse-moving roll changing part which are located on the two sides of the center line of the rack; the first transverse moving roll changing part comprises a first working roll changing frame, and the first working roll changing frame is provided with a first working roll storage part comprising two working roll storage positions which are independent from each other and are different from each other; the second transverse movement roll changing part comprises a second working roll changing frame, and a second working roll storage part comprising two working roll storage positions which are independent from each other and different from each other is arranged on the second working roll changing frame; a transmission side push-pull structure; and a control unit. Working rollers need to be rapidly and efficiently replaced, two sets of rollers of different types need to be stored at the same time, and the requirement for rapidly replacing the rollers is met; working roller storage environment is improved, and service life of working rollers is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of plate and strip steel production, and in particular to a working roll changing structure of a leveling machine. Background Art

[0002] The demand for plate and strip materials in various industries is increasing day by day, and there is an urgent need to improve the equipment level and process level of plate and strip steel production equipment. At the same time, users have also put forward higher requirements for the quality of plate and strip materials. As a tool to improve the quality of plate and strip steel, the flattening machine has been widely used and developed. As the core equipment for flattening in the last processing step of strip materials, the flattening machine has been widely used. The research on how to optimize its equipment structure more reasonably, reduce its equipment failure points, and improve the production efficiency of the flattening machine has become more and more valuable for practical production applications.

[0003] At present, four-roll skin pass mills and level pass mills are widely used in the field of cold rolling of strip steel. In particular, the four-roll skin pass mill has obvious advantages in rolling capacity, plate shape control ability, production cost, production efficiency, etc. Its application occasions have gradually expanded from ordinary carbon steel, low alloy structural steel, etc. to special steel fields such as high-quality steel and high-strength steel.

[0004] In order to meet the process requirements of improving the deep drawing performance and painting performance of steel plates and flat rolling high-strength steel, it is necessary to design a textured working roll with a textured function and a small-diameter working roll that can flatten high-strength steel. Therefore, the device for replacing working rolls on the transmission side must not only be able to quickly and efficiently replace working rolls, but also be able to store two sets of different types of rolls at the same time to meet the requirements of fast roll change.

[0005] Prior art 1: Figure 2 As shown in the figure, the drive side working roll change roll transverse shifting car adopts a single-side single-station transverse shifting form. After the working roll is hoisted and placed in the transverse shifting roll change trolley, it is connected and moved transversely through the transverse shifting hydraulic cylinder. This roll changer structure can only accommodate a set of new working rolls at a time. However, during the production process of the skin-pass mill, sometimes it is temporarily necessary to produce textured products or high-strength steel according to product requirements. At this time, it is necessary to quickly replace the working rolls in the frame with textured rolls or small-diameter rolls. Since this structure can only store one set of working rolls, if other types of roll systems are available in the roll change frame, it is necessary to hoist the inappropriate roll system away and re-hoist the required textured roll or small-diameter roll. If there is no roll system in the roll change frame at this time, it is also necessary to temporarily hoist the required textured roll or small-diameter roll into the roll change frame. Therefore, this single-station design structure makes it impossible to quickly switch the required roll system, and the roll change time and efficiency are greatly affected.

[0006] Prior art 2: Figure 3As shown in the figure, the working roll changing roll shifting car on the transmission side of the roll changing car adopts a double-station shifting structure. This structure adds a new station for storing working rolls on the basis of the single-station shifting roll changing car. However, in this structure, when the roll changing car is shifted, there is always a group of stations storing new working rolls aligned with the center of the frame. During the operation of the leveling machine, a large amount of wet leveling liquid and high-pressure water cleaning liquid will splash along the center of the frame onto one of the groups of working rolls facing the center of the frame, causing rust on the roll surface. Therefore, the working rolls of this structure will inevitably be corroded and rusted by water mist, which greatly shortens the working life of the roll system. If the rust is serious, the set of working rolls cannot be used.

[0007] Therefore, the inventor, relying on many years of experience and practice in related industries, proposes a working roll changing structure for a leveling machine to overcome the defects of the prior art. Summary of the invention

[0008] The purpose of the present invention is to provide a working roll changing structure for a leveling machine to overcome the problems existing in the prior art such as low roll changing efficiency, limited roll changing types, and easy corrosion and rust of the roll system. The present invention not only needs to be able to quickly and efficiently replace the working rolls, but also needs to be able to store two sets of different types of rolls at the same time to meet the requirements of fast roll changing; improve the working roll storage environment and increase the life of the working rolls.

[0009] The object of the present invention is achieved by a working roll changing structure of a leveling machine, comprising:

[0010] The roll changing structure on the operating side can be moved close to the working roll to support and transfer the old working roll being replaced;

[0011] The transmission side transverse shift roll changing structure comprises a first transverse shift roll changing part and a second transverse shift roll changing part which are arranged on the transmission side and are respectively located on both sides of the center line of the frame; the first transverse shift roll changing part comprises a first working roll changing frame which can be laterally moved between one side of the center line of the frame and the center line of the frame, and the first working roll changing frame is provided with a first working roll storage part which comprises two independent and different working roll storage positions; the second transverse shift roll changing part comprises a second working roll changing frame which can be laterally moved between the other side of the center line of the frame and the center line of the frame, and the second working roll changing frame is provided with a second working roll storage part which comprises two independent and different working roll storage positions; each working roll storage position is used to store a new working roll to be replaced; when roll changing is required, the first transverse shift roll changing part or the second transverse shift roll changing part is transversely moved to the center line of the frame; when the leveling machine is operating normally, the first transverse shift roll changing part and the second transverse shift roll changing part are respectively located on both sides of the working roll away from the center line of the frame;

[0012] A transmission side push-pull structure, used for pushing a new working roll on the working roll storage position into the frame and pushing an old working roll from the frame to the operating side roll changing structure;

[0013] The control unit, the operating side roller changing structure, the transmission side transverse roller changing structure and the transmission side push-pull structure are all electrically connected to the control unit.

[0014] In a preferred embodiment of the present invention, the transmission side transverse shift roll changing structure further comprises a horizontal transverse shift track, and the first working roll changing frame and the second working roll changing frame are respectively movably arranged on the transverse shift track;

[0015] When the leveling machine operates normally, the first working roll changing frame and the second working roll changing frame are respectively located at two ends of the transverse movement track; when rolls need to be changed, the first working roll changing frame or the second working roll changing frame is transversely moved to the center line of the frame.

[0016] In a preferred embodiment of the present invention, the bottom ends of the first working roll changing stand and the second working roll changing stand are respectively provided with inwardly concave guide grooves, and the guide grooves are sleeved on the transverse track.

[0017] In a preferred embodiment of the present invention, a first transverse push-pull portion capable of pushing and pulling the first working roll changing frame to move along the transverse track is connected to the first working roll changing frame.

[0018] In a preferred embodiment of the present invention, a first support is arranged on the side of the bottom end of the first working roll changing frame close to the center line of the frame, one end of the first transverse push-pull portion is connected to the first support, and the first transverse push-pull portion drives the first working roll changing frame to move along the transverse track by pushing the first support to move transversely.

[0019] In a preferred embodiment of the present invention, the first transverse push-pull portion includes a first transverse hydraulic cylinder, the first transverse hydraulic cylinder includes a first cylinder barrel, a first cylinder rod is sealingly and slidingly inserted in the first cylinder barrel, and the first cylinder barrel is fixed; one end of the first cylinder rod located on the outside of the first cylinder barrel is connected to the first support.

[0020] In a preferred embodiment of the present invention, a second transverse push-pull portion capable of pushing and pulling the second working roll changing frame to move along the transverse track is connected to the second working roll changing frame.

[0021] In a preferred embodiment of the present invention, a second support is arranged on the side of the bottom end of the second working roll changing frame close to the center line of the frame, one end of the second transverse push-pull portion is connected to the second support, and the second transverse push-pull portion drives the second working roll changing frame to move along the transverse track by pushing the second support to move transversely.

[0022] In a preferred embodiment of the present invention, the second transverse push-pull portion includes a second transverse hydraulic cylinder, the second transverse hydraulic cylinder includes a second cylinder barrel, a second cylinder rod is sealingly and slidingly arranged in the second cylinder barrel, and the second cylinder barrel is fixed; one end of the second cylinder rod located on the outside of the second cylinder barrel is connected to the second support.

[0023] In a preferred embodiment of the present invention, push-pull units corresponding to the two working roll storage positions on the first working roll storage portion or the second working roll storage portion are provided on the transmission side push-pull structure, and each of the push-pull units can independently complete the push-pull replacement of the new working roll on the corresponding working roll storage position.

[0024] In a preferred embodiment of the present invention, the operating side roll changing structure is provided with old roll supporting units corresponding to the two working roll storage positions on the first working roll storage section or the second working roll storage section respectively.

[0025] In a preferred embodiment of the present invention, a first limit switch and a second limit switch electrically connected to the control unit are respectively provided on the first working roll changing stand and the second working roll changing stand, and a first sensing block and a second sensing block corresponding to the first limit switch and the second limit switch are respectively provided on the frame, and the control unit controls the movement and stop position of the first working roll changing stand and the second working roll changing stand through the sensing signals of the first limit switch and the second limit switch.

[0026] As described above, the working roll changing structure of the leveling machine of the present invention has the following beneficial effects:

[0027] The present invention can not only meet the needs of special leveling machine process, but also can quickly move the transmission side transverse roller changing structure, quickly switch the working roller station, and move the required type of working roller to the center roller changing station of the frame; it can also realize efficient and fast switching of different types of working rollers, save roller changing time, and improve the working efficiency of roller changing, and the working roller storage position for storing the working roller is far away from the center of the frame, so as to prevent wet leveling liquid and high-pressure water cleaning liquid from splashing onto the working roller along the center of the frame, causing roller surface corrosion;

[0028] After adopting the present invention, when waiting for roll replacement, two sets of different types of working rolls are respectively waiting for roll replacement at positions far away from the center of the frame, meeting the needs of diversified working rolls and preventing wet leveling liquid and high-pressure water cleaning liquid from splashing onto the working rolls along the center of the frame. The storage environment of the working rolls is greatly improved, there is almost no rust, and the service life of the rolls is guaranteed, meeting the use requirements of the leveling mill;

[0029] After adopting the present invention, when one of the transverse shifting roll changing parts fails, the other transverse shifting roll changing part can temporarily replace it. After the broken part is repaired, the roll changing function is restored, so as to avoid the inability to work when the parts are damaged and need to be repaired, thereby meeting the use requirements of the leveling machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0031] in:

[0032] Figure 1 It is a schematic diagram of the working roll changing structure of the leveling machine of the present invention.

[0033] Figure 2 It is a schematic diagram of prior art one.

[0034] Figure 3 It is a schematic diagram of the second prior art.

[0035] In the figure:

[0036] 1. First traverse cylinder; 11. First cylinder barrel; 12. First cylinder rod;

[0037] 2. First working roll changing stand; 21. First support;

[0038] 3. First working roll storage section;

[0039] 4. Transverse track bracket;

[0040] 5. Second working roll changing stand; 51. Second support;

[0041] 6. Second working roll storage section;

[0042] 7. second traverse cylinder; 71. second cylinder barrel; 72. second cylinder rod;

[0043] 8. Horizontal shift track. DETAILED DESCRIPTION

[0044] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0045] The specific embodiments of the present invention described herein are only used to explain the purpose of the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be considered to belong to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on the other element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0047] like Figure 1 As shown, the present invention provides a working roll changing structure of a leveling machine, comprising:

[0048] The roll changing structure on the operating side can be moved close to or away from the working roll to support and transfer the old working roll being replaced;

[0049] The transmission side transverse roller changing structure comprises a first transverse roller changing part and a second transverse roller changing part which are arranged on the transmission side and are respectively located on both sides (entrance and exit) of the center line of the frame;

[0050] The first transverse roll changing section comprises a first working roll changing stand 2 which can be laterally moved between one side of the center line of the frame and the center line of the frame, and the first working roll changing stand 2 is provided with a first working roll storage section 3 which comprises two independent and different working roll storage positions;

[0051] The second transverse shift roll changing part comprises a second working roll changing stand 5 which can be laterally moved between the other side of the center line of the frame and the center line of the frame, and the second working roll changing stand 5 is provided with a second working roll storage part 6 which comprises two independent and different working roll storage positions; the second transverse shift roll changing part and the first transverse shift roll changing part may have the same structural form, and are symmetrically arranged on both sides of the center line of the frame;

[0052] Each work roll storage position is used to store new work rolls to be replaced; in order to meet the process requirements of improving the deep drawing performance and painting performance of steel plates and leveling high-strength steel, it is necessary to design a textured work roll with a textured function and a small-diameter work roll that can level high-strength steel. Therefore, the two work roll storage positions on the first work roll storage section 3 or the second work roll storage section 6 should meet the storage requirements of the textured work roll and the small-diameter work roll respectively. The specifications of each work roll storage position are determined according to the specifications of the work rolls required for actual production;

[0053] When the roll needs to be changed, the first transverse roll changing unit or the second transverse roll changing unit is transversely moved to the center line of the frame; when the leveling machine is working normally, the first transverse roll changing unit and the second transverse roll changing unit are respectively located on both sides of the working roll away from the center line of the frame;

[0054] The transmission side push-pull structure is used to push the new working roll on the working roll storage position into the frame and push the old working roll from the frame to the operating side roll changing structure;

[0055] The control part, the operating side roller changing structure, the transmission side transverse roller changing structure and the transmission side push-pull structure are all electrically connected to the control part.

[0056] The present invention can not only meet the needs of special leveling machine process, but also can quickly drive the side transverse shifting roll changing structure, quickly switch the working roll station, and move the required type of working roll to the center roll changing station of the frame (existing technology). At the same time, there will not be a working roll storage position where the working roll is fixedly stored and aligned with the center roll changing position of the frame. The waiting positions of the first transverse shifting roll changing part and the second transverse shifting roll changing part are both on both sides of the center line of the frame, and only when the roll needs to be changed, it will be transversely moved to the center of the frame to realize the roll changing process.

[0057] The present invention can realize efficient and rapid switching of different types of working rolls, save roll changing time, and improve the work efficiency of roll changing. In addition, the working roll storage position for storing the working rolls is far away from the center of the frame, preventing wet leveling liquid and high-pressure water cleaning liquid from splashing onto the working rolls along the center of the frame, causing rust on the roll surface.

[0058] The working roll changing structure of the leveling machine of the present invention has the following beneficial effects:

[0059] After adopting the present invention, when waiting for roll replacement, two sets of different types of working rolls are respectively waiting for roll replacement at positions far away from the center of the frame, meeting the needs of diversified working rolls and preventing wet leveling liquid and high-pressure water cleaning liquid from splashing onto the working rolls along the center of the frame. The storage environment of the working rolls is greatly improved, there is almost no rust, and the service life of the rolls is guaranteed, meeting the use requirements of the leveling mill;

[0060] After adopting the present invention, when one of the transverse shifting roll changing parts fails, the other transverse shifting roll changing part can temporarily replace it. After the broken part is repaired, the roll changing function is restored, so as to avoid the inability to work when the parts are damaged and need to be repaired, thereby meeting the use requirements of the leveling machine.

[0061] Further, if Figure 1 As shown, the transmission side transverse shifting roll changing structure further includes a horizontal transverse shifting track 8 which is arranged perpendicularly to the central axis of the working roll, and the first working roll changing frame 2 and the second working roll changing frame 5 are respectively movably arranged on the transverse shifting track 8; specifically, the transverse shifting track 8 is supported and arranged on the transverse shifting track bracket 4;

[0062] When the leveling machine is working normally, the first working roll changing stand 2 and the second working roll changing stand 5 are respectively located at the two ends of the transverse track 8, the first working roll changing stand 2 is located at the entrance of the transmission side, and the second working roll changing stand 5 is located at the exit of the transmission side; when roll changing is required, the first working roll changing stand 2 or the second working roll changing stand 5 is transversely moved to the center line of the frame, that is, the working roll station.

[0063] Further, if Figure 1 As shown, the bottom ends of the first working roll changing stand 2 and the second working roll changing stand 5 are respectively provided with inwardly concave guide grooves, and the guide grooves are sleeved on the transverse track 8.

[0064] Further, if Figure 1 As shown, the first working roll changing frame 2 is connected to a first transverse push-pull portion capable of pushing and pulling the first working roll changing frame 2 to move along the transverse track 8 .

[0065] Further, if Figure 1 As shown, a first support 21 is arranged on the side of the bottom end of the first working roll changing frame 2 close to the center line of the frame, one end of the first transverse push-pull portion is connected to the first support 21, and the first transverse push-pull portion drives the first working roll changing frame 2 to move along the transverse track 8 by pushing the first support 21 to move transversely.

[0066] Further, if Figure 1 As shown, the first transverse push-pull part includes a first transverse hydraulic cylinder 1, which includes a first cylinder barrel 11, in which a first cylinder rod 12 is sealingly and slidingly inserted, and the first cylinder barrel 11 is fixed; one end of the first cylinder rod 12 located on the outside of the first cylinder barrel 11 is connected to the first support 21.

[0067] A control valve is provided on the first transverse hydraulic cylinder 1 , and the control unit controls the extension and retraction of the first cylinder rod 12 through the control valve to ensure the moving speed and displacement of the first working roll changing frame 2 .

[0068] Further, if Figure 1As shown, the second working roll changing frame 5 is connected to a second transverse push-pull portion capable of pushing and pulling the second working roll changing frame 5 to move along the transverse track 8 .

[0069] Further, if Figure 1 As shown, a second support 51 is arranged on the side of the bottom end of the second working roll changing frame 5 close to the center line of the frame, one end of the second transverse push-pull portion is connected to the second support 51, and the second transverse push-pull portion drives the second working roll changing frame 5 to move along the transverse track 8 by pushing the second support 51 to move transversely.

[0070] Further, if Figure 1 As shown, the second transverse push-pull part includes a second transverse hydraulic cylinder 7, which includes a second cylinder barrel 71, in which a second cylinder rod 72 is sealingly and slidably arranged, and the second cylinder barrel 71 is fixed; one end of the second cylinder rod 72 located on the outside of the second cylinder barrel 71 is connected to the second support 51.

[0071] A control valve is provided on the second transverse hydraulic cylinder 7 , and the control unit controls the extension and retraction of the second cylinder rod 72 through the control valve to ensure the moving speed and displacement of the second working roll changing frame 5 .

[0072] Furthermore, the transmission side push-pull structure adopts a movable push-pull car structure, and push-pull units corresponding to the two working roll storage positions on the first working roll storage part 3 or the second working roll storage part 6 are arranged on the transmission side push-pull structure, and each push-pull unit is connected to a push-pull hydraulic cylinder; each push-pull unit can independently complete the push-pull replacement of the new working roll on the corresponding working roll storage position, that is, two different types of working rolls can be independently replaced at the same time.

[0073] The transmission side push-pull structure is located on the transmission side, which enables the new working roll to be pushed into the frame, while the old working roll is withdrawn from the frame to complete the roll changing process.

[0074] Furthermore, the operating side roll changing structure is provided with old roll supporting units corresponding to two working roll storage positions on the first working roll storage part or the second working roll storage part. The operating side roll changing structure has no rolls, and its function is to support the replaced old working rolls and move them away from the frame.

[0075] Furthermore, the positions of the transmission side push-pull structure and the transmission side transverse roller changing structure are controlled by limit switches.

[0076] The first working roll changing frame 2 and the second working roll changing frame 5 are respectively provided with a first limit switch and a second limit switch electrically connected to the control unit, and the frame is provided with a first sensing block and a second sensing block corresponding to the first limit switch and the second limit switch respectively. The control unit controls the movement and stop position of the first working roll changing frame 2 and the second working roll changing frame 5 through the sensing signals of the first limit switch and the second limit switch respectively.

[0077] A third limit switch electrically connected to the control unit is provided on the transmission side push-pull structure, and a third sensing block corresponding to the third limit switch is provided on the frame. The control unit controls the movement and stop position of the transmission side push-pull structure through the sensing signal of the third limit switch.

[0078] Furthermore, the first working roll changing frame 2, the second working roll changing frame 5 and the transverse track bracket 4 are welded steel structures.

[0079] When changing rolls, the roll changing structure on the operating side (roll changing car on the operating side) is pushed to the position where the old working roll is replaced, and the first transverse hydraulic cylinder 1 transversely moves the first working roll changing frame 2 located at the waiting position to the position where the new working roll is replaced, or the second transverse hydraulic cylinder 7 transversely moves the second working roll changing frame 5 located at the waiting position to the position where the new working roll is replaced. The first working roll changing frame 2 or the second working roll changing frame 5 can be transversely moved according to production needs;

[0080] The push-pull hydraulic cylinder pushes the transmission side push-pull structure to push the new working roll into the frame and push the old working roll out of the frame to complete the roll change. The positions of the transmission side push-pull structure and the transmission side transverse roll change structure are controlled by limit switches.

[0081] The replaced old working rolls are lifted by the workshop crane to the steel coil warehouse and then transported to the grinding roll room.

[0082] As described above, the working roll changing structure of the leveling machine of the present invention has the following beneficial effects:

[0083] The present invention can not only meet the needs of special leveling machine process, but also can quickly move the transmission side transverse roller changing structure, quickly switch the working roller station, and move the required type of working roller to the center roller changing station of the frame; it can also realize efficient and fast switching of different types of working rollers, save roller changing time, and improve the working efficiency of roller changing, and the working roller storage position for storing the working roller is far away from the center of the frame, so as to prevent wet leveling liquid and high-pressure water cleaning liquid from splashing onto the working roller along the center of the frame, causing roller surface corrosion;

[0084] After adopting the present invention, when waiting for roll replacement, two sets of different types of working rolls are respectively waiting for roll replacement at positions far away from the center of the frame, meeting the needs of diversified working rolls and preventing wet leveling liquid and high-pressure water cleaning liquid from splashing onto the working rolls along the center of the frame. The storage environment of the working rolls is greatly improved, there is almost no rust, and the service life of the rolls is guaranteed, meeting the use requirements of the leveling mill;

[0085] After adopting the present invention, when one of the transverse shifting roll changing parts fails, the other transverse shifting roll changing part can temporarily replace it. After the broken part is repaired, the roll changing function is restored, so as to avoid the inability to work when the parts are damaged and need to be repaired, thereby meeting the use requirements of the leveling machine.

[0086] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A working roll changing structure of a leveling machine, characterized in that: include: The roll changing structure on the operating side can be moved close to the working roll to support and transfer the old working roll being replaced; The transmission side transverse shift roll changing structure comprises a first transverse shift roll changing part and a second transverse shift roll changing part which are arranged on the transmission side and are respectively located on both sides of the center line of the frame; the first transverse shift roll changing part comprises a first working roll changing frame which can be laterally moved between one side of the center line of the frame and the center line of the frame, and the first working roll changing frame is provided with a first working roll storage part which comprises two independent and different working roll storage positions; the second transverse shift roll changing part comprises a second working roll changing frame which can be laterally moved between the other side of the center line of the frame and the center line of the frame, and the second working roll changing frame is provided with a second working roll storage part which comprises two independent and different working roll storage positions; each working roll storage position is used to store a new working roll to be replaced; when roll changing is required, the first transverse shift roll changing part or the second transverse shift roll changing part is transversely moved to the center line of the frame; when the leveling machine is operating normally, the first transverse shift roll changing part and the second transverse shift roll changing part are respectively located on both sides of the working roll away from the center line of the frame; A transmission side push-pull structure, used for pushing a new working roll on the working roll storage position into the frame and pushing an old working roll from the frame to the operating side roll changing structure; The control unit, the operating side roller changing structure, the transmission side transverse roller changing structure and the transmission side push-pull structure are all electrically connected to the control unit.

2. The working roll changing structure of the leveling machine according to claim 1, characterized in that: The transmission side transverse shift roll changing structure further comprises a horizontal transverse shift track, and the first working roll changing frame and the second working roll changing frame are respectively movably arranged on the transverse shift track; When the leveling machine operates normally, the first working roll changing frame and the second working roll changing frame are respectively located at two ends of the transverse movement track; when rolls need to be changed, the first working roll changing frame or the second working roll changing frame is transversely moved to the center line of the frame.

3. The working roll changing structure of the leveling machine according to claim 2, characterized in that: The bottom ends of the first working roll changing frame and the second working roll changing frame are respectively provided with inwardly concave guide grooves, and the guide grooves are sleeved on the transverse movement track.

4. The working roll changing structure of the leveling machine according to claim 2, characterized in that: The first working roll changing frame is connected to a first transverse push-pull portion capable of pushing and pulling the first working roll changing frame to move along the transverse track.

5. The working roll changing structure of the leveling machine according to claim 4, characterized in that: A first support is arranged on the side of the bottom end of the first working roll changing frame close to the center line of the frame, one end of the first transverse push-pull portion is connected to the first support, and the first transverse push-pull portion drives the first working roll changing frame to move along the transverse track by pushing the first support to move transversely.

6. The working roll changing structure of the leveling machine according to claim 5, characterized in that: The first transverse push-pull part includes a first transverse hydraulic cylinder, which includes a first cylinder barrel, in which a first cylinder rod is sealingly and slidably arranged, and the first cylinder barrel is fixed; one end of the first cylinder rod located outside the first cylinder barrel is connected to the first support.

7. The working roll changing structure of a skin-pass mill according to claim 2, characterized in that: The second working roll changing frame is connected to a second transverse push-pull portion capable of pushing and pulling the second working roll changing frame to move along the transverse track.

8. The working roll changing structure of the leveling machine according to claim 7, characterized in that: A second support is arranged on the side of the bottom end of the second working roll changing frame close to the center line of the frame, one end of the second transverse push-pull portion is connected to the second support, and the second transverse push-pull portion drives the second working roll changing frame to move along the transverse track by pushing the second support to move transversely.

9. The working roll changing structure of the leveling machine according to claim 8, characterized in that: The second transverse push-pull part includes a second transverse hydraulic cylinder, which includes a second cylinder barrel, in which a second cylinder rod is sealingly and slidably arranged, and the second cylinder barrel is fixed; one end of the second cylinder rod located outside the second cylinder barrel is connected to the second support.

10. The working roll changing structure of a skin-pass mill according to claim 1, characterized in that: The transmission side push-pull structure is provided with push-pull units corresponding to the two working roll storage positions on the first working roll storage portion or the second working roll storage portion, and each push-pull unit can independently complete the push-pull replacement of the new working roll on the corresponding working roll storage position.

11. The working roll changing structure of a skin-pass mill according to claim 10, characterized in that: The operating side roll changing structure is provided with old roll supporting units corresponding to the two working roll storage positions on the first working roll storage portion or the second working roll storage portion respectively.

12. The working roll changing structure of a skin-pass mill according to claim 1, characterized in that: The first working roll changing stand and the second working roll changing stand are respectively provided with a first limit switch and a second limit switch electrically connected to the control unit, and the frame is provided with a first sensing block and a second sensing block corresponding to the first limit switch and the second limit switch respectively, and the control unit controls the movement and stop position of the first working roll changing stand and the second working roll changing stand through sensing signals of the first limit switch and the second limit switch respectively.

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