Cold Strip Mill

Abstract

The present invention is a cold strip rolling mill, comprising a frame, wherein an upper support roll, an upper working roll, a lower working roll and a lower support roll are arranged in the frame, upper working roll bearing seats are arranged at both ends of the upper working roll, and lower working roll bearing seats are arranged at both ends of the lower working roll. An inlet side bending roll block and an outlet side bending roll block are arranged on both sides of the upper working roll bearing seat and both sides of the lower working roll bearing seat, respectively, an inlet side multi-stage positioning cylinder and an inlet side locking cylinder are arranged in the inlet side bending roll block, and an outlet side multi-stage positioning cylinder and an outlet side locking cylinder are arranged in the outlet side bending roll block. The inlet side multi-stage positioning cylinder is arranged opposite to the outlet side locking cylinder, and the inlet side locking cylinder is arranged opposite to the outlet side multi-stage positioning cylinder. The present invention can realize horizontal multi-stage adjustment of the working roll, and the adjustment is accurate and stable, so that the working roll can withstand a smaller horizontal force under stable rolling.

Description

Technical Field

[0001] The invention relates to the technical field of metal strip rolling equipment, and in particular to a cold-rolling strip rolling mill. Background Art

[0002] In the field of cold-rolled steel strip, cold-rolled nonferrous metal and alloy strip, four-roll and six-roll mills are widely used to roll wide strips with a width greater than 800 mm. Such mills have perfect thickness control and plate shape control systems and corresponding mechanical structures. However, it is difficult for traditional four-roll and six-roll mills to control the thinning of the strip edges; and due to structural limitations, the working roll diameter is large, making it difficult to roll thinner strips, especially difficult-to-deform materials.

[0003] In order to control the thinning of the strip edge, the working roll of the six-high mill can be designed with an axial movement function; in combination with the control curve of the working roll surface, the thinning of the strip edge can be effectively controlled. In order to roll thinner strips and difficult-to-deform materials, small-diameter working rolls are required for rolling; however, during the rolling process of the working rolls, the strip steel exerts a horizontal force on the working roll surface, causing the working rolls to bend horizontally; if the working roll diameter is reduced, the horizontal force will cause the working roll to bend too much, which will not only affect the strip shape, but also cause the working roll to break in severe cases. The magnitude of the horizontal force of the working roll is related to the rolling force and strip tension, as well as the horizontal offset between the center line of the working roll and the center line of the support roll or the intermediate roll. If the horizontal offset between the center line of the working roll and the center line of the support roll or the intermediate roll is adjusted according to the rolling pressure, strip tension and working roll transmission mode, the horizontal force of the working roll can be controlled within a smaller range, so that small-diameter working rolls can be used to roll difficult-to-deform materials and thinner strips.

[0004] Therefore, the inventor, relying on his many years of experience and practice in related industries, proposes a cold-rolling strip mill to overcome the defects of the prior art. Summary of the invention

[0005] The object of the present invention is to provide a cold strip rolling mill which can realize multi-level horizontal adjustment of working rolls, and the adjustment is accurate and stable, so that the working rolls can withstand smaller horizontal forces under stable rolling.

[0006] The object of the present invention is achieved in this way. A cold strip rolling mill comprises a frame, wherein an upper support roll, an upper working roll, a lower working roll and a lower support roll are sequentially arranged in the frame from top to bottom, upper working roll bearing seats are arranged at both ends of the upper working roll, and lower working roll bearing seats are arranged at both ends of the lower working roll; an inlet side bending roll block and an outlet side bending roll block are respectively arranged on both sides of the upper working roll bearing seat and both sides of the lower working roll bearing seat, and the inlet side bending roll block and the outlet side bending roll block are both arranged on the frame; an inlet side multi-stage positioning cylinder and an inlet side multi-stage positioning cylinder are arranged in the inlet side bending roll block The locking cylinder is provided with an outlet side multi-stage positioning cylinder and an outlet side locking cylinder in the outlet side bending roll block; the inlet side multi-stage positioning cylinder is arranged opposite to the outlet side locking cylinder, and the inlet side locking cylinder is arranged opposite to the outlet side multi-stage positioning cylinder; the axes of the inlet side multi-stage positioning cylinder, the inlet side locking cylinder, the outlet side multi-stage positioning cylinder and the outlet side locking cylinder are all arranged horizontally and perpendicular to the axis of the upper working roll; the piston rods of the inlet side multi-stage positioning cylinder, the inlet side locking cylinder, the outlet side multi-stage positioning cylinder and the outlet side locking cylinder can all be pressed against the upper working roll bearing seat or the lower working roll bearing seat.

[0007] In a preferred embodiment of the present invention, when the axis of the upper working roll and the axis of the lower working roll are in the same vertical plane with the center line of the rolling mill, the gaps between the upper working roll bearing seat, the lower working roll bearing seat and the inlet side bending roll block are greater than the maximum working stroke of the inlet side multi-stage positioning cylinder, and the gaps between the upper working roll bearing seat, the lower working roll bearing seat and the outlet side bending roll block are greater than the maximum working stroke of the outlet side multi-stage positioning cylinder.

[0008] In a preferred embodiment of the present invention, the upper working roll bearing seat and the corresponding inlet side bending roll block and the corresponding outlet side bending roll block are all axially fixed along the axial direction of the upper working roll, and the lower working roll bearing seat and the corresponding inlet side bending roll block and the corresponding outlet side bending roll block are all axially fixed along the axial direction of the lower working roll; an inlet side slide groove and an outlet side slide groove are provided on the window wall of the frame, the inlet side bending roll block is embedded in the inlet side slide groove and can slide along the axial direction of the upper working roll, and the outlet side bending roll block is embedded in the outlet side slide groove and can slide along the axial direction of the upper working roll.

[0009] In a preferred embodiment of the present invention, an inlet side connecting beam is fixedly connected between the inlet side bending roll block located on the operating side of the rolling mill and the corresponding inlet side bending roll block located on the transmission side of the rolling mill, and an outlet side connecting beam is fixedly connected between the outlet side bending roll block located on the operating side of the rolling mill and the corresponding outlet side bending roll block located on the transmission side of the rolling mill; the upper working roll bearing seat and the lower working roll bearing seat located on the operating side or the transmission side of the rolling mill are both provided with a first extension arm and a second extension arm, and a first clamping groove is opened on the corresponding inlet side bending roll block, and the first extension arm is provided on the upper working roll bearing seat and the lower working roll bearing seat. The end of the arm can be clamped in the first clamping groove, and a gap is left between the bottom of the first clamping groove; a second clamping groove is opened on the corresponding outlet side bending roller block, and the end of the second extension arm can be clamped in the second clamping groove, and a gap is left between the bottom of the second clamping groove; an upper moving cylinder and a lower moving cylinder are also provided on the frame, the upper moving cylinder is connected to the corresponding inlet side bending roller block or the outlet side bending roller block, and is used to drive the axial movement of the upper working roller; the lower moving cylinder is connected to the corresponding inlet side bending roller block or the outlet side bending roller block, and is used to drive the axial movement of the lower working roller.

[0010] In a preferred embodiment of the present invention, wear-resistant lining blocks and steel sliding blocks are sandwiched between the inlet side bending roller block and the bottom of the inlet side chute, and between the outlet side bending roller block and the bottom of the outlet side chute.

[0011] In a preferred embodiment of the present invention, a first bending roll cylinder and a second bending roll cylinder are provided in the inlet side bending roll block and the outlet side bending roll block, the first bending roll cylinder is used to drive the upper working roll bearing seat or the lower working roll bearing seat to move upward, and the second bending roll cylinder is used to drive the upper working roll bearing seat or the lower working roll bearing seat to move downward.

[0012] In a preferred embodiment of the present invention, upper protrusions are provided on both sides of the upper end of the upper working roll bearing seat and on both sides of the upper end of the lower working roll bearing seat, and lower protrusions are provided on both sides of the lower end of the upper working roll bearing seat and on both sides of the lower end of the lower working roll bearing seat. The piston rod of the first bending roll cylinder can rest on the upper protrusions, and the piston rod of the second bending roll cylinder can rest on the lower protrusions.

[0013] In a preferred embodiment of the present invention, a first inlet side mounting groove and a second inlet side mounting groove are provided on the inlet side bending roller block, the cylinder body of the inlet side multi-stage positioning cylinder is inserted and fixed in the first inlet side mounting groove, and the cylinder body of the inlet side locking cylinder is inserted and fixed in the second inlet side mounting groove; a plurality of inlet side oil channels are provided in the inlet side bending roller block, and each inlet side oil channel is respectively connected to the corresponding oil ports in the inlet side multi-stage positioning cylinder and the inlet side locking cylinder; a first outlet side mounting groove and a second outlet side mounting groove are provided on the outlet side bending roller block, the cylinder body of the outlet side multi-stage positioning cylinder is inserted and fixed in the first outlet side mounting groove, and the outlet side locking cylinder is inserted and fixed in the second outlet side mounting groove; a plurality of outlet side oil channels are provided in the outlet side bending roller block, and each outlet side oil channel is respectively connected to the corresponding oil ports in the outlet side multi-stage positioning cylinder and the outlet side locking cylinder.

[0014] In a preferred embodiment of the present invention, the inlet-side multi-stage positioning cylinder and the outlet-side multi-stage positioning cylinder are both three-stage positioning cylinders, four-stage positioning cylinders or five-stage positioning cylinders.

[0015] In a preferred embodiment of the present invention, the cold strip rolling mill is a four-roll cold strip rolling mill.

[0016] In a preferred embodiment of the present invention, the cold strip mill is a six-roll cold strip mill, an upper intermediate roll is provided between the upper support roll and the upper working roll, and a lower intermediate roll is provided between the lower working roll and the lower support roll.

[0017] As described above, the cold rolling strip mill in the present invention, through the cooperation of the multi-stage positioning cylinder and the locking cylinder, can move the upper working roll and the lower working roll in parallel in the horizontal direction according to the rolling parameters and the structural parameters of the strip mill, and realize horizontal multi-stage adjustment, thereby adjusting the horizontal offset between the center line of the working roll and the center line of the support roll accurately and stably, so that the working roll can withstand smaller horizontal force under stable rolling, so that smaller diameter working rolls can be used to roll thinner high-strength strips. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0019] Figure 1 : A structural diagram of a cold-rolled strip mill provided by the present invention.

[0020] Figure 2 :for Figure 1 A partial enlarged view of the upper and lower working rolls.

[0021] Figure 3 :for Figure 1 Cross-sectional view along MM direction.

[0022] Figure 4 :for Figure 3 An enlarged view of this section on the operating side of the rolling mill.

[0023] Figure 5 : A top view of the cooperation between the upper working roll provided by the present invention and the upper working roll bearing seat, the inlet side bending roll block and the outlet side bending roll block.

[0024] Figure 6 : A structural diagram of the inlet side bending roll block located on the operating side of the rolling mill provided by the present invention.

[0025] Figure 7 :for Figure 6 Cross-sectional view along the NN direction.

[0026] Figure 8 :for Figure 6 Cross-sectional view along the FF direction.

[0027] Fig. 9 :for Figure 6 Cross-sectional view along EE direction.

[0028] Fig.10 :for Figure 6 A top view of the Figure 6 and Fig.10 The inlet-side locking cylinder is not shown.

[0029] Description of Figure Numbers:

[0030] 1. Frame; 11. Inlet side slide; 12. Outlet side slide; 13. Steel slide block; 14. Wear-resistant lining block;

[0031] 2. Upper support roller; 21. Upper middle roller;

[0032] 3. Upper working roll; 31. Upper working roll bearing seat;

[0033] 4. Lower working roll; 41. Lower working roll bearing seat;

[0034] 51. first extension arm; 52. second extension arm; 53. upper protrusion; 54. lower protrusion;

[0035] 6. Lower support roller; 61. Lower middle roller;

[0036] 7. Inlet side bending roller block; 71. Inlet side multi-stage positioning cylinder; 72. Inlet side locking cylinder; 73. First inlet side mounting groove; 74. Inlet side oil channel; 75. Inlet side connecting beam; 76. First clamping groove;

[0037] 8. Bending roller block on the outlet side; 81. Multi-stage positioning cylinder on the outlet side; 82. Locking cylinder on the outlet side; 83. Connecting beam on the outlet side; 84. Second card slot;

[0038] 91. First roller bending cylinder; 92. Second roller bending cylinder. DETAILED DESCRIPTION

[0039] 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.

[0040] like Figures 1 to 10 As shown, this embodiment provides a cold strip rolling mill, including a frame 1, in which an upper support roll 2, an upper working roll 3, a lower working roll 4 and a lower support roll 6 are arranged in sequence from top to bottom in the frame 1, and upper working roll bearing seats 31 are arranged at both ends of the upper working roll 3, and lower working roll bearing seats 41 are arranged at both ends of the lower working roll 4. An inlet side bending roll block 7 and an outlet side bending roll block 8 are respectively arranged on both sides of the upper working roll bearing seat 31 and both sides of the lower working roll bearing seat 41, and the inlet side bending roll block 7 and the outlet side bending roll block 8 are both arranged on the frame 1. An inlet side multi-stage positioning cylinder 71 and an inlet side locking cylinder 72 are arranged in the inlet side bending roll block 7, and an outlet side multi-stage positioning cylinder 81 and an outlet side locking cylinder 82 are arranged in the outlet side bending roll block 8. The inlet side multi-stage positioning cylinder 71 and the outlet side locking cylinder 82 are arranged opposite to each other, and the inlet side locking cylinder 72 and the outlet side multi-stage positioning cylinder 81 are arranged opposite to each other. The axes of the inlet side multi-stage positioning cylinder 71, the inlet side locking cylinder 72, the outlet side multi-stage positioning cylinder 81 and the outlet side locking cylinder 82 are all horizontally arranged and perpendicular to the axis of the upper working roll 3, and the piston rods of the inlet side multi-stage positioning cylinder 71, the inlet side locking cylinder 72, the outlet side multi-stage positioning cylinder 81 and the outlet side locking cylinder 82 can all be pressed against the upper working roll bearing seat 31 or the lower working roll bearing seat 41.

[0041] There are two upper working roll bearing seats 31 and two lower working roll bearing seats 41 in the whole rolling mill. An inlet side bending roll block 7 and an outlet side bending roll block 8 are respectively arranged on both sides of the upper working roll bearing seat 31 located on the operation side of the rolling mill, and an inlet side bending roll block 7 and an outlet side bending roll block 8 are respectively arranged on both sides of the lower working roll bearing seat 41 located on the operation side of the rolling mill; an inlet side bending roll block 7 and an outlet side bending roll block 8 are respectively arranged on both sides of the upper working roll bearing seat 31 located on the transmission side of the rolling mill, and an inlet side bending roll block 7 and an outlet side bending roll block 8 are respectively arranged on both sides of the lower working roll bearing seat 41 located on the transmission side of the rolling mill; there are four inlet side bending roll blocks 7 and four outlet side bending roll blocks 8 in the whole rolling mill, each inlet side bending roll block 7 is provided with an inlet side multi-stage positioning cylinder 71 and an inlet side locking cylinder 72, and each outlet side bending roll block 8 is provided with an outlet side multi-stage positioning cylinder 81 and an outlet side locking cylinder 82.

[0042] In the initial position, the axes of the upper working roll 3 and the lower working roll 4 are in the same vertical plane as the axes of the upper support roll 2 and the lower support roll 6, and are in the same vertical plane as the center line of the rolling mill (the center line of the rolling mill mentioned in the text refers to the horizontal center line of the rolling mill perpendicular to the rolling direction); at the same time, a preset gap is left between the upper working roll bearing seat 31 and the bending roll blocks on both sides of it, and a preset gap is left between the lower working roll bearing seat 41 and the bending roll blocks on both sides of it.

[0043] Reference Figure 1 , Figure 3 and Figure 5 , Figure 1 , Figure 3 and Figure 5 The left side is the entrance side of the rolling mill. Figure 1 , Figure 3 and Figure 5 The right side in the figure is the exit side of the rolling mill; Figure 3 and Figure 5 The lower side is the rolling mill operating side. Figure 3 and Figure 5 The upper side in the figure is the transmission side of the rolling mill. Taking the adjustment of the upper working roll 3 as an example, on the operation side of the rolling mill, the piston rod of the multi-stage positioning cylinder 71 on the inlet side is extended to different strokes, and then the piston rod of the locking cylinder 82 on the outlet side is extended to make the upper working roll bearing seat 31 press against the multi-stage positioning cylinder 71 on the inlet side; the action of each cylinder on the transmission side of the rolling mill is synchronized with the operation side of the rolling mill, so that the axis of the upper working roll 3 can be horizontally offset by different distances in one direction relative to the center line of the rolling mill. Similarly, the piston rod of the multi-stage positioning cylinder 81 on the outlet side is extended to different strokes, and then the piston rod of the locking cylinder 72 on the inlet side is extended to make the upper working roll bearing seat 31 press against the multi-stage positioning cylinder 81 on the outlet side; the action of each cylinder on the transmission side of the rolling mill is synchronized with the operation side of the rolling mill, so that the axis of the upper working roll 3 can be horizontally offset by different distances in another direction relative to the center line of the rolling mill. According to the different levels of the selected multi-stage positioning cylinder, the stroke of the piston rod of the multi-stage positioning cylinder can have multiple gears, thereby horizontally offsetting the axis of the working roll by different distances.

[0044] When the piston rod of the multi-stage positioning cylinder 71 on the inlet side or the multi-stage positioning cylinder 81 on the outlet side moves, no matter what position the bearing seat is in before, the multi-stage positioning cylinder can position its piston rod at the position of the corresponding stroke, and because the multi-stage positioning cylinder itself has a positioning function, it can ensure that its piston rod remains fixed after moving to the stroke position, so as to achieve precise adjustment of the offset of the working roll. After that, the corresponding locking cylinder moves to push the bearing seat to press against the multi-stage positioning cylinder to achieve locking and keep the position of the bearing seat more stable.

[0045] Therefore, the cold rolling strip mill in this embodiment, through the cooperation of the multi-stage positioning cylinder and the locking cylinder, can move the upper working roll 3 and the lower working roll 4 in parallel in the horizontal direction according to the rolling parameters and the structural parameters of the strip mill, and realize horizontal multi-stage adjustment, thereby adjusting the horizontal offset between the center line of the working roll and the center line of the support roll accurately and stably, so that the working roll can withstand smaller horizontal force under stable rolling, so that smaller diameter working rolls can be used to roll thinner high-strength strips.

[0046] In a specific implementation, in order to make the structure more compact, when the axis of the upper working roll 3 and the axis of the lower working roll 4 are in the same vertical plane with the center line of the rolling mill, the gaps between the upper working roll bearing seat 31 and the lower working roll bearing seat 41 and the inlet side bending roll block 7 are both greater than the maximum working stroke of the inlet side multi-stage positioning cylinder 71, and the gaps between the upper working roll bearing seat 31 and the lower working roll bearing seat 41 and the outlet side bending roll block 8 are both greater than the maximum working stroke of the outlet side multi-stage positioning cylinder 81.

[0047] That is, in the initial position, the gap between the upper working roll bearing seat 31 and the lower working roll bearing seat 41 and the bending roll blocks on both sides thereof is larger than the maximum working stroke of the multi-stage positioning cylinder; when adjusting the working rolls, the axis of the working roll can be offset to different distances toward the inlet side of the rolling mill relative to the center line of the rolling mill through the cooperation of the multi-stage positioning cylinder 71 on the inlet side and the locking cylinder 82 on the outlet side; the axis of the working roll can be offset to different distances toward the outlet side of the rolling mill relative to the center line of the rolling mill through the cooperation of the multi-stage positioning cylinder 81 on the outlet side and the locking cylinder 72 on the inlet side; compared with the method of using the multi-stage positioning cylinder 71 on the inlet side to push the bearing seat to move toward the outlet side relative to the center line of the rolling mill and using the multi-stage positioning cylinder 81 on the outlet side to push the bearing seat to move toward the inlet side relative to the center line of the rolling mill, the maximum stroke of the multi-stage positioning cylinder is shorter, its volume is smaller, and the overall structure is more compact.

[0048] Furthermore, in the initial position, the gaps between the upper working roll bearing seat 31 and the lower working roll bearing seat 41 and the bending roll blocks on both sides thereof are larger than the maximum working stroke of the multi-stage positioning cylinder. The inlet-side multi-stage positioning cylinder 71 and the outlet-side multi-stage positioning cylinder 81 both use three-stage positioning cylinders and hydraulic cylinders. Taking the adjustment of the upper working roll 3 as an example, combined with Figure 3 and Figure 4 The working process of adjusting the horizontal offset of the working roll of the rolling mill is as follows:

[0049] Each three-stage positioning cylinder has a first oil port A, a second oil port B and a third oil port C, and the first oil port A, the second oil port B and the third oil port C are arranged sequentially from the cylinder bottom to the cylinder port of the three-stage positioning cylinder. The piston rod of the three-stage positioning cylinder has three strokes in total, and its piston rod can be positioned in the fully extended position, the middle position and the fully retracted position.

[0050] On the operation side of the rolling mill, the oil ports of the inlet side locking cylinder 72 and the outlet side multi-stage positioning cylinder 81 are all depressurized. When the first oil port A of the inlet side multi-stage positioning cylinder 71 is supplied with pressure oil, the second oil port B and the third oil port C are all depressurized; or the second oil port B is supplied with pressure oil, the first oil port A and the third oil port C are all depressurized; or the first oil port A and the second oil port B are both supplied with pressure oil, and the third oil port C is depressurized, the piston rod of the inlet side multi-stage positioning cylinder 71 extends to the rightmost end, that is, it is in the fully extended position. The rodless chamber of the outlet side locking cylinder 82 is supplied with pressure oil, and its piston rod extends to press the upper working roll bearing seat 31 against the inlet side multi-stage positioning cylinder 71. The actions of the cylinders on the transmission side of the rolling mill are synchronized with those on the operation side of the rolling mill. At this time, the horizontal center line (i.e., axis) of the upper working roll 3 is offset to the inlet side (i.e., to the left) of the rolling mill relative to the center line of the rolling mill by a distance e1.

[0051] On the operation side of the rolling mill, the oil ports of the inlet side locking cylinder 72 and the outlet side multi-stage positioning cylinder 81 are all depressurized. When the first oil port A and the third oil port C of the inlet side multi-stage positioning cylinder 71 are both supplied with pressure oil and the second oil port B is depressurized, the piston rod of the inlet side multi-stage positioning cylinder 71 extends to the middle position. The rodless chamber of the outlet side locking cylinder 82 is supplied with pressure oil, and its piston rod extends to push the upper working roll bearing seat 31 against the inlet side multi-stage positioning cylinder 71. The actions of the cylinders on the transmission side of the rolling mill are synchronized with those on the operation side of the rolling mill. At this time, the horizontal center line of the upper working roll 3 is offset by a distance e2 relative to the center line of the rolling mill toward the inlet side (i.e., to the left) of the rolling mill.

[0052] On the operation side of the rolling mill, the oil ports of the inlet side locking cylinder 72 and the outlet side multi-stage positioning cylinder 81 are all depressurized. When the third oil port C of the inlet side multi-stage positioning cylinder 71 is supplied with pressure oil, and the first oil port A and the second oil port B are both depressurized, the piston rod of the inlet side multi-stage positioning cylinder 71 is retracted to the leftmost end, that is, in the fully retracted position (at this time, the end of the piston rod still extends out of the cylinder body). The rodless chamber of the outlet side locking cylinder 82 is supplied with pressure oil, and its piston rod extends to press the upper working roll bearing seat 31 against the inlet side multi-stage positioning cylinder 71. The actions of each cylinder on the transmission side of the rolling mill are synchronized with those on the operation side of the rolling mill. At this time, the horizontal center line of the upper working roll 3 is offset by a distance e3 relative to the center line of the rolling mill to the inlet side (i.e., to the left) of the rolling mill.

[0053] On the operation side of the rolling mill, the oil ports of the inlet-side multi-stage positioning cylinder 71 and the outlet-side locking cylinder 82 are all depressurized. When the first oil port A of the outlet-side multi-stage positioning cylinder 81 is supplied with pressure oil, the second oil port B and the third oil port C are all depressurized; or the second oil port B is supplied with pressure oil, the first oil port A and the third oil port C are all depressurized; or the first oil port A and the second oil port B are both supplied with pressure oil, and the oil port C is depressurized, the piston rod of the outlet-side multi-stage positioning cylinder 81 extends to the leftmost end and is also in the fully extended position. The rodless chamber of the inlet-side locking cylinder 72 is supplied with pressure oil, and its piston rod extends to press the upper working roll bearing seat 31 against the outlet-side multi-stage positioning cylinder 81. The actions of the cylinders on the transmission side of the rolling mill are synchronized with those on the operation side of the rolling mill. At this time, the horizontal center line of the upper working roll 3 is offset by a distance e4 relative to the center line of the rolling mill toward the outlet side (i.e., to the right) of the rolling mill.

[0054] On the operation side of the rolling mill, the oil ports of the inlet-side multi-stage positioning cylinder 71 and the outlet-side locking cylinder 82 are all depressurized. When the first oil port A and the third oil port C of the outlet-side multi-stage positioning cylinder 81 are both supplied with pressure oil and the second oil port B is depressurized, the piston rod of the outlet-side multi-stage positioning cylinder 81 extends to the middle position. The rodless chamber of the inlet-side locking cylinder 72 is supplied with pressure oil, and its piston rod extends to push the upper working roll bearing seat 31 against the outlet-side multi-stage positioning cylinder 81. The actions of the cylinders on the transmission side of the rolling mill are synchronized with those on the operation side of the rolling mill. At this time, the horizontal center line of the upper working roll 3 is offset by a distance e5 relative to the center line of the rolling mill toward the outlet side (i.e., to the right) of the rolling mill.

[0055] On the operation side of the rolling mill, all the oil ports of the inlet-side multi-stage positioning cylinder 71 and the outlet-side locking cylinder 82 are depressurized. When the third oil port C of the outlet-side multi-stage positioning cylinder 81 is supplied with pressure oil, and the first oil port A and the second oil port B are depressurized, the piston rod of the outlet-side multi-stage positioning cylinder 81 is retracted to the rightmost end, that is, in the fully retracted position (at this time, the end of the piston rod still extends out of the cylinder body). The rodless chamber of the inlet-side locking cylinder 72 is supplied with pressure oil, and its piston rod extends to press the upper working roll bearing seat 31 against the outlet-side multi-stage positioning cylinder 81. The actions of each cylinder on the transmission side of the rolling mill are synchronized with those on the operation side of the rolling mill. At this time, the horizontal center line of the upper working roll 3 is offset by a distance e6 relative to the center line of the rolling mill toward the outlet side (i.e., to the right) of the rolling mill.

[0056] Among them, since the gap between the bearing seat and the bending roll blocks on both sides thereof at the initial position is greater than the maximum working stroke of the multi-stage positioning cylinder, after the piston rod of the multi-stage positioning cylinder 71 on the inlet side is positioned to a certain position and locked with the locking cylinder 72 on the inlet side, the axis of the working roll is offset to the inlet side (i.e., to the left) of the rolling mill relative to the center line of the rolling mill; after the piston rod of the multi-stage positioning cylinder 81 on the outlet side is positioned to a certain position and locked with the locking cylinder 72 on the inlet side, the axis of the working roll is offset to the outlet side (i.e., to the right) of the rolling mill relative to the center line of the rolling mill. The specific offset amount = the gap between the bearing seat and the bending roll block at the initial position - the stroke of the piston rod in the multi-stage positioning cylinder. For example, when the piston rod of the multi-stage positioning cylinder 71 on the inlet side is in the fully extended position, i.e., corresponding to the maximum stroke, the offset distance e1 = the gap between the upper working roll bearing seat 31 and the bending roll block 7 on the inlet side at the initial position - the maximum stroke.

[0057] In this way, by cooperating with the inlet-side multi-stage positioning cylinder 71 and the outlet-side locking cylinder 82, the offset of the horizontal center line of the upper working roll 3 relative to the center line of the rolling mill can be adjusted between e1, e2, and e3, that is, the axis of the upper working roll 3 is offset to the inlet side (i.e., to the left) of the rolling mill relative to the center line of the rolling mill by a distance e1, e2, or e3. By cooperating with the outlet-side multi-stage positioning cylinder 81 and the inlet-side locking cylinder 72, the offset of the horizontal center line of the upper working roll 3 relative to the center line of the rolling mill can be adjusted between e4, e5, and e6, that is, the axis of the upper working roll 3 is offset to the outlet side (i.e., to the right) of the rolling mill relative to the center line of the rolling mill by a distance e4, e5, or e6.

[0058] Similarly, the lower working roll 4 can achieve different horizontal offset distances relative to the center of the rolling mill in a similar manner. Through the cooperation of the multi-stage positioning cylinder 71 on the inlet side and the locking cylinder 82 on the outlet side, the offset of the horizontal center line of the lower working roll 4 relative to the center line of the rolling mill can be adjusted between e1, e2, and e3, that is, the axis of the lower working roll 4 is offset to the inlet side (i.e., to the left) of the rolling mill relative to the center line of the rolling mill by a distance e1, e2, or e3. Through the cooperation of the multi-stage positioning cylinder 81 on the outlet side and the locking cylinder 72 on the inlet side, the offset of the horizontal center line of the lower working roll 4 relative to the center line of the rolling mill can be adjusted between e4, e5, and e6, that is, the axis of the lower working roll 4 is offset to the outlet side (i.e., to the right) of the rolling mill relative to the center line of the rolling mill by a distance e4, e5, or e6. The horizontal offset adjustment of the upper working roll 3 and the horizontal offset adjustment of the lower working roll 4 can be adjusted independently as needed.

[0059] Of course, the multi-stage positioning cylinder is not limited to the three-stage positioning cylinder in this embodiment, and a four-stage positioning cylinder, a five-stage positioning cylinder or other stages may be used according to actual needs to achieve more levels of positioning of the working roll in the horizontal direction.

[0060] In addition, the actions of the cylinders on the transmission side of the rolling mill may be asynchronous with the actions of the cylinders on the operating side of the rolling mill. When they are asynchronous, they can be used to realize the cross-roll action to achieve the function of controlling the strip shape.

[0061] Further, in order to facilitate processing and installation, refer to Figure 3 as well as Figures 6 to 10 As shown, a first inlet side mounting groove 73 and a second inlet side mounting groove are provided on the inlet side bending roll block 7, the cylinder body of the inlet side multi-stage positioning cylinder 71 is inserted and fixed in the first inlet side mounting groove 73, and the cylinder body of the inlet side locking cylinder 72 is inserted and fixed in the second inlet side mounting groove. A plurality of inlet side oil channels 74 are provided in the inlet side bending roll block 7, and each inlet side oil channel 74 is respectively connected to the corresponding oil ports in the inlet side multi-stage positioning cylinder 71 and the inlet side locking cylinder 72. A first outlet side mounting groove and a second outlet side mounting groove are provided on the outlet side bending roll block 8, the cylinder body of the outlet side multi-stage positioning cylinder 81 is inserted and fixed in the first outlet side mounting groove, and the outlet side locking cylinder 82 is inserted and fixed in the second outlet side mounting groove. A plurality of outlet side oil channels are provided in the outlet side bending roll block 8, and each outlet side oil channel is respectively connected to the corresponding oil ports in the outlet side multi-stage positioning cylinder 81 and the outlet side locking cylinder 82.

[0062] Generally, the multi-stage positioning cylinder adopts a multi-stage hydraulic cylinder (existing structure), and the locking cylinder adopts a single-rod hydraulic cylinder, and the corresponding piston rod is driven to extend by supplying oil to the corresponding oil port. The number of the inlet side oil passages 74 should be the same as the total number of oil ports in the inlet side multi-stage positioning cylinder 71 and the inlet side locking cylinder 72, and the number of the outlet side oil passages should be the same as the total number of oil ports in the outlet side multi-stage positioning cylinder 81 and the outlet side locking cylinder 82.

[0063] Furthermore, in order to make the rolling mill have the function of roll shifting to ensure good control of the thinning of the strip edge, such as Figure 1 , Figure 2 and Figure 5 As shown, the upper working roll bearing seat 31 and the corresponding inlet side bending roll block 7 and the corresponding outlet side bending roll block 8 are all axially fixed along the axial direction of the upper working roll 3, and the lower working roll bearing seat 41 and the corresponding inlet side bending roll block 7 and the corresponding outlet side bending roll block 8 are all axially fixed along the axial direction of the lower working roll 4. An inlet side chute 11 and an outlet side chute 12 are provided on the window wall of the frame 1, the inlet side bending roll block 7 is embedded in the inlet side chute 11 and can slide along the axial direction of the upper working roll 3, and the outlet side bending roll block 8 is embedded in the outlet side chute 12 and can slide along the axial direction of the upper working roll 3.

[0064] Among them, a block is generally installed on the window wall of the frame 1, and an inlet side chute 11 or an outlet side chute 12 is opened on the block. The length direction of the inlet side chute 11 and the outlet side chute 12 extends along the axial direction of the upper working roll 3, and each chute can be horizontally penetrated through the corresponding block. By driving the inlet side bending roll block 7 and the outlet side bending roll block 8 to slide in the corresponding chute along the axial direction of the working roll, the corresponding upper working roll 3 and the lower working roll 4 can be driven to move axially to achieve roller shifting, which can effectively control the edge thinning of the strip and assist in controlling the strip shape.

[0065] More specifically, an inlet side connecting beam 75 is fixedly connected between the inlet side bending roll block 7 located on the operation side of the rolling mill and the corresponding inlet side bending roll block 7 located on the transmission side of the rolling mill, and an outlet side connecting beam 83 is fixedly connected between the outlet side bending roll block 8 located on the operation side of the rolling mill and the corresponding outlet side bending roll block 8 located on the transmission side of the rolling mill. The upper working roll bearing seat 31 and the lower working roll bearing seat 41 located on the operation side or the transmission side of the rolling mill are both provided with a first extension arm 51 and a second extension arm 52, and a first clamping groove 76 is provided on the corresponding inlet side bending roll block 7, and the end of the first extension arm 51 can be clamped in the first clamping groove 76, and a gap is left between the first clamping groove 76 and the bottom of the first clamping groove 76. A second clamping groove 84 is provided on the corresponding outlet side bending roll block 8, and the end of the second extension arm 52 can be clamped in the second clamping groove 84, and a gap is left between the second clamping groove 84 and the bottom of the second clamping groove 84. An upper moving cylinder and a lower moving cylinder are also provided on the frame 1. The upper moving cylinder is connected to the corresponding inlet side bending roll block 7 or the outlet side bending roll block 8 to drive the axial movement of the upper working roll 3; the lower moving cylinder is connected to the corresponding inlet side bending roll block 7 or the outlet side bending roll block 8 to drive the axial movement of the lower working roll 4.

[0066] That is, each inlet side bending roll block 7 located on the operation side of the rolling mill is fixedly connected to the corresponding inlet side bending roll block 7 located on the transmission side of the rolling mill through an inlet side connecting beam 75, and each outlet side bending roll block 8 located on the operation side of the rolling mill is fixedly connected to the corresponding outlet side bending roll block 8 located on the transmission side of the rolling mill through an outlet side connecting beam 83; the entire rolling mill has two inlet side connecting beams 75 and two outlet side connecting beams 83. One of the two upper working roll bearing seats 31 is provided with a first extension arm 51 and a second extension arm 52, and one of the two lower working roll bearing seats 41 is provided with a first extension arm 51 and a second extension arm 52, and the entire rolling mill has two first extension arms 51 and two second extension arms 52. Generally, the extension arm is arranged on the bearing seat located on the transmission side of the rolling mill. The end of the extension arm has a flange, which can be clamped in the corresponding groove to achieve axial fixation between the bearing seat and the bending roll block. There is a gap between the flange and the bottom of the groove, which does not affect the horizontal movement of the bearing seat.

[0067] Generally, the entire rolling mill has two upper moving cylinders and two lower moving cylinders, the two upper moving cylinders are respectively connected to the inlet side bending roll block 7 and the outlet side bending roll block 8 on both sides of the upper working roll bearing seat 31 on the transmission side of the rolling mill, and the two lower moving cylinders are respectively connected to the inlet side bending roll block 7 and the outlet side bending roll block 8 on both sides of the lower working roll bearing seat 41 on the transmission side of the rolling mill. The setting of the upper moving cylinder and the lower moving cylinder can also play a role in axial positioning of the bending roll block along the axis direction of the working roll, and the stability of each bending roll block in the axis direction of the working roll can be guaranteed when each moving cylinder is not in action.

[0068] like Figure 2 As shown, generally, a wear-resistant lining block 14 and a steel slider 13 are sandwiched between the inlet side bending roller block 7 and the bottom of the inlet side chute 11, and a wear-resistant lining block 14 and a steel slider 13 are sandwiched between the outlet side bending roller block 8 and the bottom of the outlet side chute 12. The wear-resistant lining block 14 is fixedly connected to the corresponding bending roller block, and the steel slider 13 is fixedly connected to the corresponding chute.

[0069] Furthermore, in order to make the rolling mill have a roll bending function, such as Figure 3 , Figure 5 and Figure 6 As shown, a first bending roll cylinder 91 and a second bending roll cylinder 92 are provided in the inlet side bending roll block 7 and the outlet side bending roll block 8. The first bending roll cylinder 91 is used to drive the upper working roll bearing seat 31 or the lower working roll bearing seat 41 to move upward, and the second bending roll cylinder 92 is used to drive the upper working roll bearing seat 31 or the lower working roll bearing seat 41 to move downward.

[0070] The number of the first roll bending cylinder 91 and the second roll bending cylinder 92 in each roll bending block can be determined as needed. For example, in the present embodiment, two first roll bending cylinders 91 and a second roll bending cylinder 92 located between the two first roll bending cylinders 91 are provided in each roll bending block on both sides of the upper working roll bearing seat 31, and a first roll bending cylinder 91 and two second roll bending cylinders 92 located on both sides of the first roll bending cylinder 91 are provided in each roll bending block on both sides of the lower working roll bearing seat 41. The axes of the first roll bending cylinder 91 and the second roll bending cylinder 92 are both arranged vertically, and the piston rod of the first roll bending cylinder can extend upward, and the piston rod of the second roll bending cylinder 92 can extend downward.

[0071] Generally, the first bending roll cylinder 91 in the bending roll block on both sides of the upper working roll bearing seat 31 and the second bending roll cylinder 92 in the bending roll block on both sides of the lower working roll bearing seat 41 are also called positive bending roll cylinders, and the second bending roll cylinder 92 in the bending roll block on both sides of the upper working roll bearing seat 31 and the first bending roll cylinder 91 in the bending roll block on both sides of the lower working roll bearing seat 41 are also called negative bending roll cylinders. Each positive bending roll cylinder on both sides of the upper working roll bearing seat 31 is arranged vertically opposite to each positive bending roll cylinder on both sides of the lower working roll bearing seat 41, and each negative bending roll cylinder on both sides of the upper working roll bearing seat 31 is arranged vertically opposite to each negative bending roll cylinder on both sides of the lower working roll bearing seat 41. According to actual needs, through the action of each positive bending roll cylinder, the two ends of the upper working roll 3 can be bent upward and the two ends of the lower working roll 4 can be bent downward, that is, positive bending can be achieved; through the action of each negative bending roll cylinder, the two ends of the upper working roll 3 can be bent downward and the two ends of the lower working roll 4 can be bent upward, that is, negative bending can be achieved. Through the corresponding bending roll function, it is convenient to control the strip shape.

[0072] More specifically, if Figure 1 and Figure 2 As shown, upper protrusions 53 are provided on both sides of the upper end of the upper working roll bearing seat 31 and the upper end of the lower working roll bearing seat 41, and lower protrusions 54 are provided on both sides of the lower end of the upper working roll bearing seat 31 and the lower end of the lower working roll bearing seat 41. The piston rod of the first bending roll cylinder 91 can be against the upper protrusions 53, and the piston rod of the second bending roll cylinder 92 can be against the lower protrusions 54. That is, an upper protrusion 53 is provided on both sides of the upper end of each upper working roll bearing seat 31, and a lower protrusion 54 is provided on both sides of the lower end of each upper working roll bearing seat 31; an upper protrusion 53 is provided on both sides of the upper end of each lower working roll bearing seat 41, and a lower protrusion 54 is provided on both sides of the lower end of each lower working roll bearing seat 41. By lifting the corresponding upper protrusion 53 through the first bending roller cylinder 91, the corresponding bearing seat can be driven to move in the vertical direction; by pushing the corresponding lower protrusion 54 through the second bending roller cylinder 92, the corresponding bearing seat can be driven to move downward in the vertical direction.

[0073] Furthermore, the rolling mill in this embodiment can be a four-roll cold strip rolling mill or a six-roll cold strip rolling mill. When used for a six-roll rolling mill, an upper intermediate roll 21 is provided between the upper support roll 2 and the upper working roll 3, and a lower intermediate roll 61 is provided between the lower working roll 4 and the lower support roll 6.

[0074] In summary, the rolling mill in this embodiment has the following advantages:

[0075] (1) In the initial position, the gap between the bearing seat and the bending roll blocks on both sides thereof is greater than the maximum working stroke of the multi-stage positioning cylinder. Before the horizontal position of the working roll is adjusted, no matter what position the bearing seat is in, by controlling the hydraulic pressure in different oil circuits in the inlet-side multi-stage positioning cylinder 71, its piston rod can be fixed in different positions. The piston rod of the corresponding outlet-side locking cylinder 82 is extended, and the working roll bearing seat and the working roll are pressed against the piston rod of the inlet-side multi-stage positioning cylinder 71 to achieve locking and positioning. At this time, the inlet-side locking cylinder 72 and the outlet-side multi-stage positioning cylinder 81 are fully retracted. In this way, the horizontal position of the working roll can be offset to different positions in the inlet direction relative to the center line of the rolling mill, that is, the axis of the working roll is offset to different distances relative to the center line of the rolling mill toward the inlet side (i.e., to the left) of the rolling mill.

[0076] By controlling the hydraulic pressure in different oil circuits of the outlet-side multi-stage positioning cylinder 81, its piston rod can be fixed in different positions. The piston rod of the corresponding inlet-side locking cylinder 72 is extended, and the working roll bearing seat together with the working roll is pressed against the piston rod of the outlet-side multi-stage positioning cylinder 81 to achieve locking and positioning. At this time, the inlet-side multi-stage positioning cylinder 71 and the outlet-side locking cylinder 82 are fully retracted. In this way, the horizontal position of the working roll can be offset to different positions in the outlet direction relative to the center line of the rolling mill, that is, the axis of the working roll is offset to the outlet side (i.e., to the right) of the rolling mill relative to the center line of the rolling mill.

[0077] The entire rolling mill can be used on a conventional four-roll mill or a six-roll mill for rolling strip steel, nonferrous metals and alloy strips. According to the rolling parameters and the structural parameters of the strip mill, the working rolls can be moved in parallel in the horizontal direction by adjusting the position of the multi-stage positioning cylinder to achieve multi-stage positioning in the horizontal position, so as to adjust the horizontal offset between the center line of the working roll and the center line of the support roll. The working rolls can be adjusted horizontally in multiple stages, which reduces the horizontal force of the working rolls, so that smaller diameter working rolls can be used to roll thinner high-strength strips. At the same time, the rolling mill can not only reduce the horizontal force of the working rolls, but also keep the working rolls stable in the horizontal direction. Moreover, in the initial position, the gap between the bearing seat and the bending roll blocks on both sides is greater than the maximum working stroke of the multi-stage positioning cylinder, which can make the structure more compact.

[0078] (2) The actions of the cylinders on the transmission side of the rolling mill can be synchronized with the actions of the cylinders on the operating side of the rolling mill, that is, the actions of the multi-stage positioning cylinders and locking cylinders in the bending roll block on the transmission side are completely consistent with the actions of the multi-stage positioning cylinders and locking cylinders in the working roll bending roll block, so as to realize the multi-stage adjustment of the working roll in the horizontal direction. The actions of the cylinders on the transmission side of the rolling mill can also be asynchronous with the actions of the cylinders on the operating side of the rolling mill, so as to realize the cross-roll action to control the strip shape, which is more flexible in operation and has more functions.

[0079] (3) The entire rolling mill can not only realize the horizontal movement and positioning of the working rolls, but also realize the bending and shifting of the working rolls; it can also realize complete strip shape control and strip edge thinning control.

[0080] The above are only exemplary embodiments of the present invention and are 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 method for adjusting the working rolls of a cold rolling strip mill in a horizontal multi-stage manner, the cold rolling strip mill comprising a frame, wherein an upper support roll, an upper working roll, a lower working roll and a lower support roll are sequentially arranged in the frame from top to bottom, upper working roll bearing seats are arranged at both ends of the upper working roll, and lower working roll bearing seats are arranged at both ends of the lower working roll; characterized in that: An inlet side bending roll block and an outlet side bending roll block are respectively provided on both sides of the upper working roll bearing seat and both sides of the lower working roll bearing seat, and the inlet side bending roll block and the outlet side bending roll block are both arranged on the frame; an inlet side multi-stage positioning cylinder and an inlet side locking cylinder are provided in the inlet side bending roll block, and an outlet side multi-stage positioning cylinder and an outlet side locking cylinder are provided in the outlet side bending roll block; the inlet side multi-stage positioning cylinder is arranged opposite to the outlet side locking cylinder, and the inlet side locking cylinder is arranged opposite to the outlet side multi-stage positioning cylinder; the axes of the inlet side multi-stage positioning cylinder, the inlet side locking cylinder, the outlet side multi-stage positioning cylinder and the outlet side locking cylinder are all arranged horizontally and perpendicular to the axis of the upper working roll; the piston rods of the inlet side multi-stage positioning cylinder, the inlet side locking cylinder, the outlet side multi-stage positioning cylinder and the outlet side locking cylinder can all be pressed against the upper working roll bearing seat or the lower working roll bearing seat; When the axis of the upper working roll and the axis of the lower working roll are in the same vertical plane with the center line of the rolling mill, the gaps between the upper working roll bearing seat, the lower working roll bearing seat and the inlet side bending roll block are all greater than the maximum working stroke of the inlet side multi-stage positioning cylinder, and the gaps between the upper working roll bearing seat, the lower working roll bearing seat and the outlet side bending roll block are all greater than the maximum working stroke of the outlet side multi-stage positioning cylinder; through the cooperation of the inlet side multi-stage positioning cylinder and the outlet side locking cylinder, the axis of the working roll can be offset to the inlet side of the rolling mill by different distances relative to the center line of the rolling mill; through the cooperation of the outlet side multi-stage positioning cylinder and the inlet side locking cylinder, the axis of the working roll can be offset to the outlet side of the rolling mill by different distances relative to the center line of the rolling mill; By controlling the hydraulic pressure in different oil circuits of the inlet-side multi-stage positioning cylinder or the outlet-side multi-stage positioning cylinder, its piston rod can be fixed at different positions; the piston rod of the corresponding outlet-side locking cylinder or the inlet-side locking cylinder is extended, and the working roll bearing seat together with the working roll is pressed against the piston rod of the inlet-side multi-stage positioning cylinder or the outlet-side multi-stage positioning cylinder to achieve locking positioning, so as to realize that the horizontal position of the working roll is offset to different positions in the inlet direction or the outlet direction relative to the center line of the rolling mill.

2. The horizontal multi-stage adjustment method of the working rolls of the cold strip rolling mill according to claim 1, characterized in that: The upper working roll bearing seat and the corresponding inlet side bending roll block and the corresponding outlet side bending roll block are all axially fixed along the axis direction of the upper working roll, and the lower working roll bearing seat and the corresponding inlet side bending roll block and the corresponding outlet side bending roll block are all axially fixed along the axis direction of the lower working roll; An inlet side slide groove and an outlet side slide groove are provided on the window wall of the frame, the inlet side bending roll block is embedded in the inlet side slide groove and can slide along the axial direction of the upper working roll or the lower working roll, and the outlet side bending roll block is embedded in the outlet side slide groove and can slide along the axial direction of the upper working roll or the lower working roll.

3. The horizontal multi-stage adjustment method of the working rolls of the cold strip rolling mill according to claim 2, characterized in that: An inlet side connecting beam is fixedly connected between the inlet side bending roll block located on the operation side of the rolling mill and the corresponding inlet side bending roll block located on the transmission side of the rolling mill, and an outlet side connecting beam is fixedly connected between the outlet side bending roll block located on the operation side of the rolling mill and the corresponding outlet side bending roll block located on the transmission side of the rolling mill; The upper working roll bearing seat and the lower working roll bearing seat located on the operation side or the transmission side of the rolling mill are both provided with a first extension arm and a second extension arm, and a first clamping groove is provided on the corresponding inlet side bending roll block, and the end of the first extension arm can be clamped in the first clamping groove, and a gap is left between the first clamping groove and the bottom of the first clamping groove; a second clamping groove is provided on the corresponding outlet side bending roll block, and the end of the second extension arm can be clamped in the second clamping groove, and a gap is left between the second clamping groove and the bottom of the second clamping groove; An upper moving cylinder and a lower moving cylinder are also provided on the frame. The upper moving cylinder is connected to the corresponding inlet side bending roll block or the outlet side bending roll block to drive the axial movement of the upper working roll; the lower moving cylinder is connected to the corresponding inlet side bending roll block or the outlet side bending roll block to drive the axial movement of the lower working roll.

4. The horizontal multi-stage adjustment method of the working rolls of the cold strip rolling mill according to claim 2, characterized in that: A wear-resistant lining block and a steel sliding block are sandwiched between the inlet side bending roller block and the bottom of the inlet side chute, and between the outlet side bending roller block and the bottom of the outlet side chute.

5. The horizontal multi-stage adjustment method of the working rolls of the cold strip rolling mill according to claim 1, characterized in that: A first bending roll cylinder and a second bending roll cylinder are also provided in the inlet side bending roll block and the outlet side bending roll block. The first bending roll cylinder is used to drive the upper working roll bearing seat or the lower working roll bearing seat to move upward, and the second bending roll cylinder is used to drive the upper working roll bearing seat or the lower working roll bearing seat to move downward.

6. The method for adjusting the working rolls of a cold strip mill in multiple levels according to claim 5, characterized in that: Upper protrusions are provided on both sides of the upper end of the upper working roll bearing seat and on both sides of the upper end of the lower working roll bearing seat, and lower protrusions are provided on both sides of the lower end of the upper working roll bearing seat and on both sides of the lower end of the lower working roll bearing seat. The piston rod of the first bending roll cylinder can be abutted against the upper protrusions, and the piston rod of the second bending roll cylinder can be abutted against the lower protrusions.

7. The method for adjusting the working rolls of a cold strip mill in multiple levels according to claim 1, characterized in that: A first inlet side mounting groove and a second inlet side mounting groove are provided on the inlet side bending roller block, the cylinder body of the inlet side multi-stage positioning cylinder is inserted and fixed in the first inlet side mounting groove, and the cylinder body of the inlet side locking cylinder is inserted and fixed in the second inlet side mounting groove; a plurality of inlet side oil channels are provided in the inlet side bending roller block, and each of the inlet side oil channels is respectively connected to a corresponding oil port in the inlet side multi-stage positioning cylinder and the inlet side locking cylinder; A first outlet side mounting groove and a second outlet side mounting groove are provided on the outlet side bending roller block, the cylinder body of the outlet side multi-stage positioning cylinder is inserted and fixed in the first outlet side mounting groove, and the outlet side locking cylinder is inserted and fixed in the second outlet side mounting groove; a plurality of outlet side oil channels are provided in the outlet side bending roller block, and each of the outlet side oil channels is respectively connected to the corresponding oil ports in the outlet side multi-stage positioning cylinder and the outlet side locking cylinder.

8. The method for adjusting the working rolls of a cold strip mill in multiple levels according to claim 1, characterized in that: The inlet-side multi-stage positioning cylinder and the outlet-side multi-stage positioning cylinder are both three-stage positioning cylinders, four-stage positioning cylinders or five-stage positioning cylinders.

9. The method for adjusting the working rolls of a cold strip mill in multiple levels according to claim 1, characterized in that: The cold strip rolling mill is a four-roller cold strip rolling mill.

10. The method for adjusting the working rolls of a cold strip mill in multiple levels according to claim 1, characterized in that: The cold strip mill is a six-roll cold strip mill, an upper intermediate roll is provided between the upper support roll and the upper working roll, and a lower intermediate roll is provided between the lower working roll and the lower support roll.

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