Stainless steel cold continuous rolling unit

Abstract

The invention provides a stainless steel cold continuous rolling unit, which relates to the technical field of rolling equipment and comprises a rolling mill section, the rolling mill section comprises a plurality of rolling mills arranged in sequence, and each rolling mill comprises a working roll, a middle roll and a supporting roll. The symmetrical center line of the cross section projection of the supporting roller in the direction perpendicular to the extension direction of the supporting roller is deviated by a first preset distance relative to the symmetrical center line of the cross section projection of the middle roller in the direction perpendicular to the extension direction of the middle roller; the symmetrical center line of the cross section projection of the working roller in the direction perpendicular to the extension direction deviates by a second preset distance relative to the symmetrical center line of the cross section projection of the middle roller in the direction perpendicular to the extension direction, and the first preset distance is larger than the second preset distance. The roll system of the rolling mill adopts a double-eccentric design, and roll system stability and rolling mill service life can be both considered.

Description

Technical Field

[0001] This invention relates to the field of rolling equipment technology, and more specifically, to a stainless steel cold continuous rolling mill. Background Technology

[0002] Stainless steel, especially 2-series and 3-series stainless steel, has high yield strength and strong resistance to deformation, making it difficult to roll. To ensure the stability of the roll system during rolling, a six-roll mill with an eccentric design is usually used. This means that the center lines of symmetry of the work roll and the support roll in their cross-sectional projections perpendicular to their extension direction are on the same straight line, and this straight line is offset by a certain distance relative to the center line of symmetry of the intermediate roll in its cross-sectional projection perpendicular to its extension direction. If the offset is set too small, the improvement in roll system stability is very limited. If the offset is set too large, although the roll system stability is guaranteed to some extent, the rolling force on the work roll will be too large, making the work roll prone to deformation and damage, thus affecting the service life of the mill. Summary of the Invention

[0003] The present invention aims to solve the technical problem in the related technology that stainless steel six-roll mills cannot simultaneously take into account the stability of the roll system and the life of the mill.

[0004] This invention provides a stainless steel cold continuous rolling mill unit, including a rolling mill section. The rolling mill section includes multiple rolling mills arranged sequentially. Each rolling mill includes a work roll, an intermediate roll, and a support roll. Two support rolls are arranged opposite to each other, and two work rolls are arranged between the two support rolls. An intermediate roll is arranged between each work roll and its corresponding support roll. The center line of symmetry of the cross-sectional projection of the support roll perpendicular to its extension direction and the center line of symmetry of the cross-sectional projection of the work roll perpendicular to its extension direction are both located on the same side of the center line of symmetry of the cross-sectional projection of the intermediate roll perpendicular to its extension direction. The center line of symmetry of the cross-sectional projection of the support roll perpendicular to its extension direction is offset by a first preset distance relative to the center line of symmetry of the cross-sectional projection of the intermediate roll perpendicular to its extension direction. The center line of symmetry of the cross-sectional projection of the work roll perpendicular to its extension direction is offset by a second preset distance relative to the center line of symmetry of the cross-sectional projection of the intermediate roll perpendicular to its extension direction. The first preset distance is greater than the second preset distance.

[0005] Optionally, the first preset distance is 5-10mm, and the second preset distance is 0.5-2mm.

[0006] Optionally, the rolling mill further includes a frame, a side-push positioning device, and a work roll bearing seat. The work roll, the intermediate roll, and the support roll are all located within the frame. The two work rolls are rotatably mounted in their respective work roll bearing seats. The two side-push positioning devices are respectively mounted on the frame and connected to their respective work roll bearing seats.

[0007] Optionally, the rolling mill further includes a work roll positive bending hydraulic cylinder, which has two output shafts. The work roll positive bending hydraulic cylinder is disposed between the two work rolls, and the two output shafts of the work roll positive bending hydraulic cylinder are respectively connected to the bearing seats of the two work rolls.

[0008] Optionally, the rolling mill further includes a bending cylinder fixing seat. The two bending cylinder fixing seats are located on both sides of the work roll and fixed on the frame. Each bending cylinder fixing seat is equipped with a corresponding work roll positive bending hydraulic cylinder. Support plates are detachably provided on both sides of the work roll bearing seat, and the two support plates are respectively used to contact the corresponding bending cylinder fixing seat.

[0009] Optionally, the mill further includes intermediate roll traverse hydraulic cylinders, with two intermediate roll traverse hydraulic cylinders respectively connected to the corresponding intermediate roll drive to drive the intermediate roll to move along its extension direction; And / or, the mill further includes intermediate roll positive bending hydraulic cylinders, with each intermediate roll connected to a corresponding intermediate roll positive bending hydraulic cylinder.

[0010] Optionally, each of the work rolls is provided with a work roll bearing seat at both ends of its axial direction, and the difference between the distance D between the work roll bearing seats at both ends of the axial direction of each work roll and the strip width B is ≤500mm.

[0011] Optionally, the work rolls of multiple rolling mills adopt a high-rigidity dual-roll system design, with a roll diameter difference of ≥35mm between the large-size work roll and the small-size work roll.

[0012] Optionally, the rolling mill has seven rolls, of which four rolls are large-size rolls and the other three rolls are small-size rolls; or, five rolls are large-size rolls and the other two rolls are small-size rolls.

[0013] Optionally, the stainless steel cold rolling mill also includes an uncoiler, a straightener, a first shear, a welding machine, a first tension roll, an inlet looper, a second tension roll, a cleaning and drying device, a third tension roll, a flying shear, and a coiler. The uncoiler, the straightener, the first shear, the welding machine, the first tension roll, the inlet looper, and the second tension roll are arranged in sequence. The cleaning and drying device, the third tension roll, the flying shear, and the coiler are arranged in sequence. The mill section is located between the second tension roll and the cleaning and drying device.

[0014] The stainless steel cold rolling mill of the present invention has at least the following advantages compared with related technologies: Each rolling mill's work rolls, intermediate rolls, and support rolls are arranged relatively parallel and extend horizontally. Each roll can rotate around its own axis to roll the strip between two work rolls. The strip passes through multiple rolling mills in the rolling section sequentially to achieve fully continuous rolling. Because each rolling mill's roll system adopts a double-eccentric design—that is, the center line of symmetry of the support roll's cross-sectional projection perpendicular to its extension direction and the center line of symmetry of the work roll's cross-sectional projection perpendicular to its extension direction are both located on the same side of the center line of symmetry of the intermediate roll's cross-sectional projection perpendicular to its extension direction—and the center line of symmetry of the support roll's cross-sectional projection perpendicular to its extension direction is relative to the center line of symmetry of the intermediate roll's cross-sectional projection perpendicular to its extension direction. The offset of the center line (first preset distance) is greater than the offset of the center line of the work roll's cross-sectional projection perpendicular to its extension direction relative to the center line of the intermediate roll's cross-sectional projection perpendicular to its extension direction (second preset distance). In other words, the offset of the support roll relative to the intermediate roll can be set to be relatively large, so that the triangle formed by the center of the cross-sectional projections of the intermediate roll, work roll, and support roll perpendicular to their extension direction is larger, which can effectively ensure the stability of the roll system. Meanwhile, the offset of the work roll relative to the intermediate roll can be set to be relatively small, which can effectively reduce the rolling force of the work roll, avoid work roll deformation, and improve the service life of the rolling mill. This solves the existing technical problem that it is impossible to simultaneously take into account the stability and service life of the rolling mill roll system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a stainless steel cold rolling mill unit according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the rolling mill after the frame is removed, according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the structure of the rolling mill according to an embodiment of the present invention; Figure 4 for Figure 3 A magnified view of a portion of the image; Figure 5 This is a cross-sectional schematic diagram of the rolling mill according to an embodiment of the present invention; Figure 6 for Figure 5 Enlarged diagram of point A in the middle.

[0016] Explanation of reference numerals in the attached figures: 1. Rolling mill; 101. Work roll; 102. Intermediate roll; 103. Support roll; 104. Frame; 105. Side push positioning device; 106. Work roll bearing seat; 107. Work roll positive bending hydraulic cylinder; 108. Bending roll cylinder fixing seat; 109. Intermediate roll transverse movement hydraulic cylinder; 110. Intermediate roll positive bending hydraulic cylinder; 111. Support plate; 2. Uncoiler; 3. Straightener; 4. First shear; 5. Welding machine; 6. First tension roll; 7. Inlet looper; 8. Second tension roll; 9. Cleaning and drying device; 10. Third tension roll; 11. Flying shear; 12. Coiler; L1. First preset distance; L2. Second preset distance. Detailed Implementation

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0018] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fitting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0019] In addition, it should be noted that in the description of the present invention, terms such as "upper," "lower," "front," and "rear" used to indicate orientation in various embodiments are only for simplifying the description of the positional relationships based on the accompanying drawings and do not mean that the elements and devices referred to must be operated in accordance with the specific orientation and limited operation, method, and structure in the specification. Such directional terms do not constitute a limitation on the present invention.

[0020] This paper establishes an XYZ coordinate system. The Z-axis represents the vertical direction, with the positive Z-axis pointing upwards and the negative Z-axis pointing downwards. It should be noted that the aforementioned Z-axis representation is merely for ease of description and simplification of the invention, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, it should not be construed as a limitation of the invention.

[0021] like Figure 1 , Figure 3 and Figure 4As shown in the figure, a stainless steel cold rolling mill unit according to an embodiment of the present invention includes a rolling mill section, which includes a plurality of rolling mills 1 arranged sequentially. Each rolling mill 1 includes a work roll 101, an intermediate roll 102, and a support roll 103. Two support rolls 103 are arranged opposite to each other, and two work rolls 101 are provided between the two support rolls 103. An intermediate roll 102 is provided between each work roll 101 and its corresponding support roll 103. The center line of symmetry of the cross-sectional projection of the support roll 103 perpendicular to its extension direction and the center line of symmetry of the cross-sectional projection of the work roll 101 perpendicular to its extension direction are shown in the figure. The center lines are all located on the same side of the center line of the cross-section projection of the intermediate roller 102 perpendicular to its extension direction, and the center line of the cross-section projection of the support roller 103 perpendicular to its extension direction is offset by a first preset distance L1 relative to the center line of the cross-section projection of the intermediate roller 102 perpendicular to its extension direction. The center line of the cross-section projection of the working roller 101 perpendicular to its extension direction is offset by a second preset distance L2 relative to the center line of the cross-section projection of the intermediate roller 102 perpendicular to its extension direction. The first preset distance L1 is greater than the second preset distance L2.

[0022] Specifically, the rolling mill 1 has two work rolls 101, two intermediate rolls 102, and two support rolls 103, all of which extend along the direction shown by the X-axis. The two work rolls 101 are the upper work roll and the lower work roll, the two intermediate rolls 102 are the upper intermediate roll and the lower intermediate roll, and the two support rolls 103 are the upper support roll and the lower support roll. They are arranged from top to bottom in the order of upper support roll, upper intermediate roll, upper work roll, lower work roll, lower intermediate roll, and lower support roll.

[0023] The projection of each roller onto the YZ plane along its cross-section perpendicular to its extension direction is a circle. The center line of symmetry of the projection of each roller onto its cross-section perpendicular to its extension direction is a straight line along the vertical direction that passes through the center of the projection.

[0024] In this embodiment, the work roll 101, intermediate roll 102, and support roll 103 of each rolling mill 1 are relatively parallel, and each roll can rotate around its own axis to roll the strip between two work rolls 101. The strip passes through multiple rolling mills 1 in the rolling mill section in sequence to achieve fully continuous rolling and obtain cold-rolled strip of suitable thickness. Since the roll system of each rolling mill 1 adopts a double eccentric design, that is, the center line of symmetry of the support roll of the rolling mill 1 in the cross-sectional projection perpendicular to its extension direction and the center line of symmetry of the work roll 101 in the cross-sectional projection perpendicular to its extension direction are both located on the same side of the center line of symmetry of the intermediate roll 102 in the cross-sectional projection perpendicular to its extension direction. Moreover, the offset of the center line of symmetry of the support roll 103 in the cross-sectional projection perpendicular to its extension direction relative to the center line of symmetry of the intermediate roll 102 in the cross-sectional projection perpendicular to its extension direction (the first preset distance L1) is greater than the offset of the center line of symmetry of the work roll 101 in the cross-sectional projection perpendicular to its extension direction relative to the intermediate roll 102 in the cross-sectional projection perpendicular to its extension direction. The offset of the center line of the symmetrical center line of the cross-sectional projection in its extension direction (the second preset distance L2), that is, the offset of the support roll relative to the intermediate roll 102, can be set to be relatively large. This makes the triangle formed by the center N of the cross-sectional projection of the upper intermediate roll perpendicular to its extension direction, the center M of the cross-sectional projection of the upper work roll perpendicular to its extension direction, and the center P of the cross-sectional projection of the upper support roll perpendicular to its extension direction larger. The triangle formed by the center of the cross-sectional projection of the lower intermediate roll perpendicular to its extension direction, the center of the cross-sectional projection of the lower work roll perpendicular to its extension direction, and the center of the cross-sectional projection of the lower support roll perpendicular to its extension direction is also larger, which can effectively ensure the stability of the roll system. At the same time, the offset of the work roll 101 relative to the intermediate roll 102 can be set to be relatively small, which can effectively reduce the rolling force of the work roll 101, avoid deformation of the work roll 101, and improve the service life of the rolling mill 1. This solves the existing technical problem that it is impossible to simultaneously take into account the stability and service life of the rolling mill 1 roll system.

[0025] Optionally, the first preset distance is 5-10mm and the second preset distance is 0.5-2mm, that is, the support roller 103 is offset by 5-10mm relative to the intermediate roller 102 and the work roller 101 is offset by 0.5-2mm relative to the intermediate roller 102. At this time, the stability of the roller system is optimal and the rolling force of the work roller 101 is very small, so it will not deform.

[0026] like Figure 3 and Figure 6As shown, optionally, the rolling mill 1 further includes a frame 104, a side-push positioning device 105, and a work roll bearing seat 106. The work roll 101, the intermediate roll 102, and the support roll 103 are all located within the frame 104. The two work rolls 101 are rotatably disposed within their respective work roll bearing seats 106. The two side-push positioning devices 105 are respectively mounted on the frame 104 and connected to their respective work roll bearing seats 106.

[0027] Specifically, the frame 104 can be frame-shaped, with the working roller 101, intermediate roller 102, and support roller 103 all located inside the frame 104. The two ends of the upper support roller in the X direction can be installed above the frame 104 through corresponding support roller bearing seats, and the two ends of the lower support roller in the X direction can be installed below the frame 104 through corresponding support roller bearing seats. The two ends of the upper working roller in the X direction can be installed in corresponding working roller bearing seats, and the two ends of the lower working roller in the X direction can be installed in corresponding working roller bearing seats.

[0028] The cold-rolled strip moves along the Y-axis to enter and exit the mill 1, that is, the two sides of the Y-axis of the stand 104 are the entrance side and the exit side of the cold-rolled strip, respectively. The side-push positioning device 105 can be a side-push hydraulic cylinder and is installed on the entrance side of the stand 104. The two side-push hydraulic cylinders are respectively set with two work roll bearing seats. Each side-push hydraulic cylinder is driven connected to the corresponding work roll bearing seat 106. The side-push hydraulic cylinder can push the work roll bearing seat 106 and the corresponding work roll 101 to move along the Y-axis and toward the exit side of the stand 104, and maintain a certain pressure after being pushed into place, thereby realizing the position adjustment and positioning of the work roll 101.

[0029] like Figure 2 and Figure 6 As shown, optionally, the rolling mill 1 further includes a work roll bending hydraulic cylinder 107, which has two output shafts. The work roll bending hydraulic cylinder 107 is disposed between the two work rolls 101, and the two output shafts of the work roll bending hydraulic cylinder 107 are respectively connected to the two work roll bearing seats 106.

[0030] Specifically, the working roll positive bending hydraulic cylinder 107 is a dual-axis hydraulic cylinder, with two hydraulic rods that can extend and retract vertically. Since the Z-direction distance between the two working rolls 101 is small, by setting a dual-axis hydraulic cylinder between them and connecting the two output shafts to the upper and lower working roll bearing seats 106 respectively, it is possible to use one working roll positive bending hydraulic cylinder 107 to drive the two working rolls 101 simultaneously. The force on the two working rolls 101 is more uniform, and the overall structure of the rolling mill 1 is simpler, with lower cost and less space occupation.

[0031] like Figure 3 , Figure 5and Figure 6 As shown, optionally, the rolling mill 1 further includes a bending cylinder fixing seat 108. The two bending cylinder fixing seats 108 are respectively located on both sides of the work roll 101 and fixed on the frame 104. Each bending cylinder fixing seat 108 is equipped with a corresponding work roll positive bending hydraulic cylinder 107. The two sides of the work roll bearing seat 106 are respectively provided with support plates 111, and the two support plates 111 are respectively used to contact the corresponding bending cylinder fixing seat 108.

[0032] Two working roller bending hydraulic cylinders 107 are provided between one end of the upper and lower working rollers 101 along the positive or negative X-axis. The two working roller bending hydraulic cylinders 107 are located on both sides of the working roller 101 in the Y direction. The bending cylinder fixing seat 108 is provided in a one-to-one correspondence with the working roller bending hydraulic cylinder 107. The bending cylinder fixing seat 108 is fixedly installed on the inlet side and outlet side of the frame 104. The side push positioning device 105 can be installed on the bending cylinder fixing seat 108 on the inlet side of the frame 104. Support plates 11 are provided on both sides of the working roller bearing seat 106 in the Y direction. 1. Initially, the support plates 111 on both sides can contact the corresponding bending roller cylinder fixing seat 108 respectively. By changing the thickness of the support plate 111 near the outlet side of the frame 104, the side push positioning device 105 can push the work roller bearing seat 106 and the work roller 101 toward the outlet side of the frame 104 to adjust the position of the work roller 101. After being pushed into place, the support plate 111 on the outlet side contacts the bending roller cylinder fixing seat 108 on the outlet side, thereby achieving the positioning of the work roller bearing seat 106, i.e., the work roller 101.

[0033] like Figure 2 As shown, optionally, the mill 1 further includes intermediate roll traversing hydraulic cylinders 109, and the two intermediate roll traversing hydraulic cylinders 109 are respectively driven connected to the corresponding intermediate rolls 102 to drive the intermediate rolls 102 to move along their extension direction.

[0034] The intermediate roll lateral movement hydraulic cylinder 109 can push the intermediate roll 102 to move along the X-axis. By pushing the intermediate roll 102 along the X-axis with the intermediate roll lateral movement hydraulic cylinder 109, the position of the intermediate roll 102 is adjusted, thereby adjusting the shape of the rolled strip to meet different processing needs.

[0035] like Figure 2 As shown, optionally, the rolling mill 1 further includes an intermediate roll positive bending hydraulic cylinder 110, and each intermediate roll 102 is connected to the corresponding intermediate roll positive bending hydraulic cylinder 110.

[0036] In this embodiment, each intermediate roll 102 is connected to an intermediate roll bending hydraulic cylinder 110 at both ends along the X direction. The intermediate roll bending hydraulic cylinder 110 can apply a driving force in the up and down direction to the intermediate roll 102, causing the middle part of the intermediate roll 102 to bend upward, thereby changing the force applied by the intermediate roll 102 to the work roll 101, so as to adjust the shape of the rolled strip and shape it into the required shape.

[0037] In some embodiments, where space permits, the intermediate roller 102 may also be connected to an intermediate roller negative bending hydraulic cylinder, which can apply a driving force to the intermediate roller 102, causing the middle portion of the intermediate roller 102 to bend and concave downward.

[0038] like Figure 2 As shown, optionally, each of the working rolls 101 is provided with a working roll bearing seat 106 at both axial ends, and the difference between the distance D between the working roll bearing seats 106 at both axial ends of each working roll 101 and the strip width B is ≤500mm.

[0039] Each working roll 101 has a working roll bending hydraulic cylinder 107 at both axial ends. The working roll bending hydraulic cylinder 107 is connected to the working roll bearing seat 106. The distance D between the working roll bearing seats 106 at both axial ends of the working roll 101 is also the distance between the working roll bending hydraulic cylinders 107 at both axial ends of the working roll 101. If the support span D of the work roll 101 is much larger than the strip width B, the area of ​​the work roll 101 that is not in contact with the strip will be subjected to repeated bending fatigue, accelerating the peeling of the roll surface or the wear of the bearings. By making the difference between the distance D between the work roll bearing seats 106 at both ends of the axial direction of each work roll 101 and the strip width B ≤ 500mm, that is, the support span of the work roll 101 is closer to the strip width, the rolling force transmission path of the work roll 101 is shorter, avoiding premature failure of the bearings due to excessive bending moment. Moreover, it can significantly reduce the bending of the work roll 101 caused by the rolling force, avoid strip edge thinning or central wavy lines caused by excessive roll body cantilever, make the roll system deformation more symmetrical, and make the thickness tolerance in the strip width direction easier to control, which is suitable for high-precision thin strip rolling. In addition, the compact support design allows the rolling force to be smoothly transmitted to the mill stand through the bearing seat, reducing the deformation of the mill stand and improving the rigidity of the mill.

[0040] Optionally, the work rolls 101 of the multiple rolling mills 1 adopt a high-rigidity double-roll system design, with the diameter difference between the large-size work roll and the small-size work roll being ≥35mm.

[0041] In this embodiment, the work roll 101 of the rolling mill 1 is a high-rigidity roll, which improves the bending resistance and is suitable for higher rolling force conditions, thus avoiding roll system deformation.

[0042] The work rolls 101 of multiple rolling mills 1 adopt a dual-roll system design, that is, some of the work rolls 101 of the rolling mills 1 use large-size work rolls, and the other part of the work rolls 101 of the rolling mills 1 use small-size work rolls. The large-size work rolls can be located at the front end of the rolling direction, and the small-size work rolls can be located at the rear end of the rolling direction. The difference in roll diameter between the large-size work rolls and the small-size work rolls is ≥35mm. For example, the roll diameter of the large-size work rolls can be between 170mm and 210mm, and the roll diameter of the small-size work rolls can be between 130mm and 180mm. This makes the performance difference between the two sizes of work rolls 101 quite significant, avoiding redundant design of intermediate sizes. The large-size work rolls can share the main rolling force, while the small-size work rolls focus on fine forming. The combination of the two different sizes of work rolls 101 can cover the rolling needs of a variety of products.

[0043] Optionally, the rolling mill 1 has seven rolls, of which four of the rolling mill 1's work rolls 101 are large-size work rolls and the other three of the rolling mill 1's work rolls 101 are small-size work rolls; or, of which five of the rolling mill 1's work rolls 101 are large-size work rolls and the other two of the rolling mill 1's work rolls 101 are small-size work rolls.

[0044] Here, by adjusting the ratio of large and small work rolls, the overall rigidity of the rolling mill section is improved to meet the rolling needs of stainless steel cold-rolled strips of various thicknesses. For example, when the work rolls 101 of five rolling mills 1 use large work rolls and the work rolls 101 of the other two rolling mills 1 use small work rolls, that is, when the number of large work rolls is large, high-strength and high-thickness strips can be rolled; when the proportion of small work rolls increases, such as when the work rolls 101 of four rolling mills 1 use large work rolls and the work rolls 101 of the other three rolling mills 1 use small work rolls, extremely thin strips such as aluminum foil can be rolled, reducing the risk of edge cracking of the strip.

[0045] Optionally, the work rolls 101 of the plurality of rolling mills 1 adopt two specifications: large-size work rolls and small-size work rolls. The diameter of the large-size work rolls is between 170mm and 210mm, and the diameter of the small-size work rolls is between 130mm and 180mm. The rolling mill 1 is provided with seven rolls, of which four of the work rolls 101 of the rolling mill 1 adopt the large-size work rolls, and the other three of the work rolls 101 of the rolling mill 1 adopt the small-size work rolls; or, five of the work rolls 101 of the rolling mill 1 adopt the large-size work rolls, and the other two of the work rolls 101 of the rolling mill 1 adopt the small-size work rolls.

[0046] A cold continuous rolling mill may include seven rolling mills 1 arranged in sequence. The seven rolling mills 1 can achieve a larger compression ratio, obtain thinner products, and the strip rolling is less difficult and the processing quality is better.

[0047] Some of the working rolls 101 of the rolling mill 1 have large diameters, while the working rolls of the remaining rolling mill 1 have small diameters. That is, the working rolls 101 of each rolling mill 1 have different diameters, and different combination modes can be adopted. For example, four of the rolling mill 1 have large diameter working rolls 101, and the other three have small diameter working rolls 101. Alternatively, five of the rolling mill 1 have large diameter working rolls 101, and the other two have small diameter working rolls 101. Different combination modes can be flexibly selected to meet the rolling needs of stainless steel cold-rolled strips of various thicknesses and specifications.

[0048] like Figure 1 As shown, optionally, the stainless steel cold rolling mill also includes an uncoiler 2, a straightener 3, a first shear 4, a welder 5, a first tension roll 6, an inlet looper 7, a second tension roll 8, a cleaning and drying device 9, a third tension roll 10, a flying shear 11, and a coiler 12. The uncoiler 2, the straightener 3, the first shear 4, the welder 5, the first tension roll 6, the inlet looper 7, and the second tension roll 8 are arranged in sequence. The cleaning and drying device 9, the third tension roll 10, the flying shear 11, and the coiler 12 are arranged in sequence. The mill section is located between the second tension roll 8 and the cleaning and drying device 9.

[0049] Specifically, the uncoiler 2 can hold steel coils and release strip, the straightener 3 can straighten the head and tail of the strip, the first shear 4 is a hydraulic shear, the first shear 4 can cut off the unqualified part of the strip, two uncoilers 2 can be set, after the steel coil on one uncoiler 2 is released, the steel coil on the other uncoiler 2 begins to be released, and the head of the strip of the newly released steel coil is welded to the tail of the strip of the released steel coil at the welding machine 5, thereby realizing continuous rolling.

[0050] The first tension roller 6 can increase the tension of the strip entering the rolling mill section, and the second tension roller 8 can increase the tension of the strip exiting the rolling mill section. The inlet looper 7 can not only guide the strip entering the rolling mill section, but also move or adjust freely. When the welding machine 5 is welding the strip, the strip stops being fed into the inlet looper 7. At this time, by disassembling and adjusting the inlet looper 7, the strip stored inside can be released and supplied to the rolling mill section to achieve continuous rolling in the rolling mill section.

[0051] The strip output from the rolling mill may carry lubricant. The cleaning and drying device 9 can clean the lubricant on the surface of the strip and dry the strip to prevent the third tension roller 10 from slipping. The third tension roller 10 can tension the cleaned and dried strip before it enters the coiler 12. After the coiler 12 is wound to the appropriate coil diameter, the flying shear 11 cuts the strip, and then the uncoiling trolley transports the steel coil away.

[0052] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A stainless steel cold tandem rolling mill characterized by comprising: The rolling mill section comprises a plurality of rolling mills (1) arranged in sequence, each of the rolling mills (1) comprises a work roll (101), an intermediate roll (102) and a backup roll (103), two of the backup rolls (103) are oppositely arranged, two of the work rolls (101) are arranged between the two backup rolls (103), and the intermediate roll (102) is arranged between each of the work rolls (101) and the corresponding backup roll (103); the symmetric center line of the cross-sectional projection perpendicular to the extending direction of the backup roll (103) and the symmetric center line of the cross-sectional projection perpendicular to the extending direction of the work roll (101) are located on the same side of the symmetric center line of the cross-sectional projection perpendicular to the extending direction of the intermediate roll (102), and the symmetric center line of the cross-sectional projection perpendicular to the extending direction of the backup roll (103) is offset from the symmetric center line of the cross-sectional projection perpendicular to the extending direction of the intermediate roll (102) by a first preset distance (L1), and the symmetric center line of the cross-sectional projection perpendicular to the extending direction of the work roll (101) is offset from the symmetric center line of the cross-sectional projection perpendicular to the extending direction of the intermediate roll (102) by a second preset distance (L2), and the first preset distance (L1) is greater than the second preset distance (L2).

2. The stainless steel cold rolling mill according to claim 1, characterized in that The first preset distance (L1) is 5-10mm, and the second preset distance (L2) is 0.5-2mm.

3. The stainless steel cold rolling mill according to claim 1, characterized in that, The rolling mill (1) further comprises a rack (104), a side push positioning device (105) and a work roll bearing seat (106), the work roll (101), the intermediate roll (102) and the backup roll (103) are located in the rack (104), the two work rolls (101) are rotatably arranged in the corresponding work roll bearing seats (106) respectively, and the two side push positioning devices (105) are mounted on the rack (104) and connected with the corresponding work roll bearing seats (106) respectively.

4. The stainless steel cold tandem mill according to claim 3, characterized in that, The rolling mill (1) further comprises a work roll positive bending hydraulic cylinder (107), the work roll positive bending hydraulic cylinder (107) has two output shafts, the work roll positive bending hydraulic cylinder (107) is arranged between the two work rolls (101), and the two output shafts of the work roll positive bending hydraulic cylinder (107) are connected with the two work roll bearing seats (106) respectively.

5. The stainless steel cold rolling mill according to claim 4, characterized in that The rolling mill (1) further comprises a bending roll cylinder fixing seat (108), the two bending roll cylinder fixing seats (108) are located on the two sides of the work roll (101) and fixed on the rack (104) respectively, the corresponding work roll positive bending hydraulic cylinder (107) is mounted on each of the bending roll cylinder fixing seats (108), and the two sides of the work roll bearing seat (106) are detachably provided with a support plate (111) respectively, and the two support plates (111) are used for contacting the corresponding bending roll cylinder fixing seat (108) respectively.

6. The stainless steel cold rolling mill according to claim 1, characterized in that, The rolling mill (1) further comprises intermediate roll transverse movement hydraulic cylinders (109), two of which are respectively in driving connection with the corresponding intermediate roll (102) to drive the intermediate roll (102) to move along its extension direction; And / or, the rolling mill (1) further comprises intermediate roll positive bending hydraulic cylinders (110), each of which is connected with the corresponding intermediate roll positive bending hydraulic cylinder (110).

7. The stainless steel cold tandem mill according to claim 3, characterized in that, The axial both ends of each work roll (101) are respectively provided with the work roll bearing seat (106), and the difference between the spacing D between the axial both ends of each work roll (101) and the strip width B is ≤500mm.

8. The stainless steel cold rolling mill according to claim 1, characterized in that, The work rolls (101) of the plurality of rolling mills (1) adopt a high-rigidity double-roll system design, and the difference between the diameters of large-specification work rolls and small-specification work rolls is ≥35mm.

9. The stainless steel cold rolling mill according to claim 8, characterized in that The rolling mill (1) is provided with seven, four of which are provided with the large-specification work rolls (101), and the other three are provided with the small-specification work rolls (101), or five of which are provided with the large-specification work rolls (101), and the other two are provided with the small-specification work rolls (101).

10. The stainless steel cold rolling mill according to claim 1, characterized in that, It further comprises an uncoiler (2), a straightener (3), a first shear (4), a welder (5), a first tension roll (6), an inlet loop (7), a second tension roll (8), a cleaning and drying device (9), a third tension roll (10), a flying shear (11) and a coiler (12), the uncoiler (2), the straightener (3), the first shear (4), the welder (5), the first tension roll (6), the inlet loop (7) and the second tension roll (8) are sequentially arranged, the cleaning and drying device (9), the third tension roll (10), the flying shear (11) and the coiler (12) are sequentially arranged, and the second tension roll (8) and the cleaning and drying device (9) are provided with the rolling mill section.

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