Strip tail pressing device and strip cold rolling system of rolling mill

Abstract

The present invention provides a strip tail pressing device and a strip cold rolling system of a rolling mill, wherein the strip tail pressing device of the rolling mill comprises a roller frame body, an upper roller side-by-side mechanism installed on the roller frame body, a lower roller side-by-side mechanism and a clamping drive mechanism; the upper roller side-by-side mechanism comprises a first upper roller and a second upper roller, an upper roller gap is provided between the first upper roller and the second upper roller; the lower roller side-by-side mechanism comprises a first lower roller and a second lower roller, a lower roller gap is provided between the first lower roller and the second lower roller; and along the material flow direction, the first upper roller, the first lower roller, the second upper roller and the second lower roller are distributed in sequence; the clamping drive mechanism is used to drive the upper roller side-by-side mechanism and the lower roller side-by-side mechanism to be relatively close to or away from each other. Through the present invention, the technical problem that the stability of the back tension provided by the rolling equipment to the strip after the strip tail is swung during the rolling process is poor is alleviated.

Description

Technical Field

[0001] The invention relates to the technical field of cold rolling production lines, and in particular to a strip steel tail pressing device of a rolling mill and a strip steel cold rolling system. Background Art

[0002] At present, reversible rolling refers to the rolling process in which the strip steel is repeatedly pressed down and deformed on the rolling mill for multiple times to finally obtain the finished product thickness. The steel coil is sent to the uncoiler by the steel coil conveying equipment. In the first pass, the uncoiler uncoils the strip, and the strip head passes through the rolling mill and enters the rear coiler for coiling. The front and rear tensions of the strip steel in this rolling process are provided by the uncoiler, the rolling mill and the rear coiler. At the end of the first rolling pass, the uncoiling is completed, and the tail of the strip steel will be separated from the coiler and move to the front coiler at the entrance side of the rolling mill. After the coil jaws of the front coiler clamp the tail of the strip steel, the strip steel is rolled back and forth for multiple times between the front and rear coilers and the rolling mill.

[0003] During the first rolling process, after the strip is unwound and the tail reaches the section in front of the front coiler, the tail of the strip will be in a free tension-free state. In order to carry out subsequent rolling, it is necessary to apply post-tension to the tail of the strip.

[0004] A strip pressure plate device is usually used to provide post-tension for the steel plate after the uncoiler unwinds and swings its tail. The strip pressure plate device includes an upper pressure plate and a lower pressure plate. When working, the upper pressure plate is pressed down by a hydraulic cylinder, and a certain friction force is generated between the steel plate and the hardwood by clamping the upper pressure plate and the lower pressure plate, so as to generate post-tension between the steel plate after unwinding and the rolling mill, thereby stabilizing the first pass rolling of the single stand.

[0005] In order to provide greater post-tension and reduce damage to the strip surface, the upper and lower pressing plates in the strip pressing plate device are made of hardwood. However, compared with steel, hardwood is softer in texture, and friction will cause rapid wear of the hardwood, making the friction surface condition worse, causing the friction coefficient between the two to be unstable, and reducing the stability of the post-tension; hardwood will also shed during operation. Therefore, the strip pressing plate device made of hardwood has poor stability in the post-tension applied to the strip, which is easy to affect the quality of the rolling section, reduce the yield rate, and require frequent replacement of hardwood boards. Summary of the invention

[0006] The purpose of the present invention is to provide a strip tail pressing device and a strip cold rolling system for a rolling mill to alleviate the technical problem of poor stability of the back tension provided by the rolling equipment to the strip after the strip tail is swung during the rolling process.

[0007] The above-mentioned purpose of the present invention can be achieved by adopting the following technical solutions:

[0008] The present invention provides a strip tail pressing device of a rolling mill, comprising: a roller frame body, an upper roller side-by-side mechanism installed on the roller frame body, a lower roller side-by-side mechanism and a clamping drive mechanism; the upper roller side-by-side mechanism comprises a first upper roller and a second upper roller, an upper roller gap is provided between the first upper roller and the second upper roller; the lower roller side-by-side mechanism comprises a first lower roller and a second lower roller, a lower roller gap is provided between the first lower roller and the second lower roller; and along the material flow direction, the first upper roller, the first lower roller, the second upper roller and the second lower roller are distributed in sequence; the clamping drive mechanism is used to drive the upper roller side-by-side mechanism and the lower roller side-by-side mechanism to be relatively close to or away from each other.

[0009] In a preferred embodiment, the axis of the first upper roller, the axis of the second upper roller, the axis of the first lower roller, and the axis of the second lower roller are all perpendicular to the material flow direction.

[0010] In a preferred embodiment, the lower side of the upper roller parallel mechanism is connected to a limit screw for abutting against the lower roller parallel mechanism, and / or the upper side of the lower roller parallel mechanism is connected to a limit screw for abutting against the upper roller parallel mechanism.

[0011] In a preferred embodiment, the upper roller side-by-side mechanism includes an upper bearing seat for mounting the first upper roller and the second upper roller, and the lower roller side-by-side mechanism includes a lower bearing seat for mounting the first lower roller and the second lower roller, and the upper bearing seat and the lower bearing seat are both mounted on the roller frame body.

[0012] In a preferred embodiment, the lower bearing seat is fixed to the roller frame body; the clamping drive mechanism includes a tail-pressing hydraulic cylinder installed on the roller frame body, and the tail-pressing hydraulic cylinder is connected to the upper bearing seat to drive the upper roller side-by-side mechanism to move up and down.

[0013] In a preferred embodiment, the roller frame body is detachably connected with a locking plate, and the locking plate abuts against the upper bearing seat and the lower bearing seat respectively to limit the axial position of the upper bearing seat and the axial position of the lower bearing seat.

[0014] In a preferred embodiment, the lower roller side-by-side mechanism is provided with a roll-changing roller; the strip tail pressing device of the rolling mill includes a roll-changing beam frame arranged below the roll-changing roller and a lifting hydraulic cylinder connected to the roll-changing beam frame, the roll-changing beam frame is provided with a sliding surface extending along the axial direction of the first lower roller, and the lifting hydraulic cylinder can drive the roll-changing beam frame to move upward until the sliding surface abuts against the roll-changing roller.

[0015] In a preferred embodiment, an ejector screw for pushing the lower roller parallel mechanism to move along the sliding surface is provided at the end of the roller changing crossbeam frame.

[0016] In a preferred embodiment, a protruding structure is provided on the top of the lower bearing seat; the strip tail pressing device of the rolling mill includes a roll changing locking frame, and the roll changing locking frame can be locked with the protruding structure to be connected to the lower bearing seat.

[0017] In a preferred embodiment, the strip tail pressing device of the rolling mill includes a transverse movement device, which is connected to the roller frame body and is used to drive the roller frame body to move along the axial direction of the first lower roller.

[0018] In a preferred embodiment, the transverse movement device includes a base, a transverse movement slide rail installed on the base, and a transverse movement hydraulic cylinder, the roller frame body is installed on the transverse movement slide rail, and the transverse movement hydraulic cylinder is transmission-connected to the roller frame body.

[0019] In a preferred embodiment, the strip tail pressing device of the rolling mill includes a roll changing stand, the transverse movement device can drive the roller frame body to move to connect with the roll changing stand, and the upper roller side-by-side mechanism and the lower roller side-by-side mechanism can move to the roll changing stand.

[0020] In a preferred embodiment, the strip tail pressing device of the rolling mill includes a drag chain, a drag chain frame and a crossbeam, wherein the drag chain frame is fixedly arranged; the first end of the crossbeam is fixed to the roller frame body, and the second end of the crossbeam extends to the outer side of the roller frame body close to the roll changing stand; the first end of the drag chain is connected to the drag chain frame, and the second section of the drag chain is connected to the crossbeam.

[0021] The present invention provides a strip steel cold rolling system, comprising: a reversible rolling mill and a strip steel tail pressing device of the rolling mill, wherein the strip steel tail pressing device of the rolling mill is arranged at the feeding side of the reversible rolling mill.

[0022] The characteristics and advantages of the present invention are:

[0023] After the strip is uncoiled and the tail is swung out, the tail of the strip moves between the upper roller parallel mechanism and the lower roller parallel mechanism in the strip tail pressing device of the rolling mill, and the clamping drive mechanism drives the upper roller parallel mechanism and the lower roller parallel mechanism to be relatively close, until the first upper roller and the second upper roller abut the upper surface of the strip, and the first lower roller and the second lower roller abut the lower surface of the strip.

[0024] Since an upper roller gap is provided between the first upper roller and the second upper roller, a lower roller gap is provided between the first lower roller and the second lower roller, and the first upper roller, the first lower roller, the second upper roller and the second lower roller are distributed in sequence along the material flow direction, the strip steel will undergo elastic deformation under the action of the pressing force, and the first upper roller, the first lower roller, the second upper roller and the second lower roller apply a relatively stable post-tensioning force to the strip steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 An axonometric view of the strip tail pressing device of the rolling mill provided by the present invention in the rolling tail pressing position;

[0027] Figure 2 An axonometric view of the strip tail pressing device of the rolling mill provided by the present invention in the maintenance position;

[0028] Figure 3 for Figure 2 A front view of a strip tail pressing device of a rolling mill is shown;

[0029] Figure 4 for Figure 2 A side view of a strip tail pressing device of a rolling mill is shown;

[0030] Figure 5 A schematic diagram of each roller in the strip tail pressing device of the rolling mill provided by the present invention;

[0031] Figure 6 A side view of the upper roller side-by-side mechanism in the strip tail pressing device of the rolling mill provided by the present invention;

[0032] Figure 7 for Figure 6 A front view of the upper roller side-by-side mechanism shown;

[0033] Figure 8 A side view of a lower roller side-by-side mechanism in a strip tail pressing device of a rolling mill provided by the present invention;

[0034] Fig. 9 for Figure 8 A front view of the lower roller side-by-side mechanism shown;

[0035] Fig.10 A schematic structural diagram of a roll-changing crossbeam frame in a strip tail pressing device of a rolling mill provided by the present invention;

[0036] Fig.11 An axonometric view of a roll-changing locking frame in a strip tail pressing device of a rolling mill provided by the present invention from a first viewing angle;

[0037] Fig.12 An axonometric view of a roll-changing locking frame in a strip tail pressing device of a rolling mill provided by the present invention from a second viewing angle;

[0038] Fig.13 A schematic diagram of a strip steel cold rolling system of a rolling mill provided by the present invention.

[0039] Description of Figure Numbers:

[0040] 10. Roller frame; 11. Frame body; 12. Sliding seat; 13. Support seat; 14. Locking plate; 100. Material flow direction;

[0041] 110, upper roller parallel mechanism; 111, first upper roller; 112, second upper roller; 113, upper bearing seat; 114, connecting shaft; 115, pin shaft; 116, upper roller gap;

[0042] 120, lower roller parallel mechanism; 121, first lower roller; 122, second lower roller; 123, lower bearing seat; 124, limit top screw; 125, roller changing wheel; 126, lower roller gap; 127, groove structure;

[0043] 130. Clamping drive mechanism; 131. Tail pressing hydraulic cylinder;

[0044] 140, roller changing beam frame; 141, sliding surface; 142, ejector screw;

[0045] 150. Lifting hydraulic cylinder;

[0046] 160, roller changing lock frame; 161, protrusion; 162, protruding edge; 163, boss;

[0047] 20. Transverse movement device; 21. Base; 22. Transverse movement hydraulic cylinder; 23. Transverse movement slide rail;

[0048] 30. Roller changing stand;

[0049] 401, crossbeam; 402, drag chain; 403, drag chain frame;

[0050] 1. Uncoiler; 2. Front coiler; 3. Strip tail pressing device; 4. Reversible rolling mill; 5. Rear coiler. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] Embodiment 1

[0053] The present invention provides a strip tail pressing device for a rolling mill, such as Figure 1 , Figure 2 and Figure 5 As shown, the strip tail pressing device of the rolling mill includes: a roller frame body 10, an upper roller parallel mechanism 110, a lower roller parallel mechanism 120 and a pressing drive mechanism 130 installed on the roller frame body 10; the upper roller parallel mechanism 110 includes a first upper roller 111 and a second upper roller 112, and an upper roller gap 116 is provided between the first upper roller 111 and the second upper roller 112; the lower roller parallel mechanism 120 includes a first lower roller 121 and a second lower roller 122, and a lower roller gap 126 is provided between the first lower roller 121 and the second lower roller 122; and as shown Figure 5 As shown, along the material flow direction 100, the first upper roller 111, the first lower roller 121, the second upper roller 112 and the second lower roller 122 are distributed in sequence; the clamping drive mechanism 130 is used to drive the upper roller parallel mechanism 110 and the lower roller parallel mechanism 120 to be relatively close to or away from each other.

[0054] After the strip is uncoiled and the tail is swung off, the tail of the strip moves between the upper roller parallel mechanism 110 and the lower roller parallel mechanism 120, and the clamping drive mechanism 130 drives the upper roller parallel mechanism 110 and the lower roller parallel mechanism 120 to be relatively close, until the first upper roller 111 and the second upper roller 112 abut against the upper surface of the strip, and the first lower roller 121 and the second lower roller 122 abut against the lower surface of the strip.

[0055] Since an upper roller gap 116 is provided between the first upper roller 111 and the second upper roller 112, a lower roller gap 126 is provided between the first lower roller 121 and the second lower roller 122, and the first upper roller 111, the first lower roller 121, the second upper roller 112 and the second lower roller 122 are distributed in sequence along the material flow direction 100, the strip steel will undergo elastic deformation under the action of the clamping force, and the first upper roller 111, the first lower roller 121, the second upper roller 112 and the second lower roller 122 apply a relatively stable post-tensioning force to the strip steel.

[0056] Compared with the strip press device made of hardwood, the strip tail press device of this rolling mill is quite different. In the strip press device made of hardwood, the upper and lower press plates are in plane contact with the strip respectively. In actual production, the incoming state of the strip is different, and waves or water and oil will appear on the strip. The shape of the strip and foreign matter on the surface have a great influence on the contact state between the upper and lower press plates and the steel plate, causing changes in friction conditions and making the back tension more unstable. In addition, the upper and lower press plates provide back tension by friction with the strip, which will cause heat generation and have an adverse effect on the stability of the back tension.

[0057] The material of each roller in the strip tail pressing device can be 9Cr2Mo. According to the material and thickness of the production specification plate, the spacing between the rollers should be increased to ensure a certain wrap angle; the outer diameter of each roller can remain unchanged within a certain plate variation range, mainly to meet the structural and space requirements.

[0058] The strip tail pressing device of the rolling mill has a first upper roller 111 and a second upper roller 112 located above the first lower roller 121 and the second lower roller 122, a material flow roll gap is formed between the upper roller side-by-side mechanism 110 and the lower roller side-by-side mechanism 120, and the first upper roller 111 and the second upper roller 112 in the upper roller side-by-side mechanism 110 and the first lower roller 121 and the second lower roller 122 in the lower roller side-by-side mechanism 120 form a mutually staggered structure, which is conducive to making the back tension more stable; the first upper roller 111, the second upper roller 112, the first lower roller 121 and the second lower roller 122 are in contact with the strip in a rolling manner, which reduces the wear and heat of each roller compared to sliding contact, which is conducive to maintaining stable contact conditions, improving the stability of the back tension, and extending the service life of each roller.

[0059] After the strip tail is swung, the direction from the strip tail to the strip head is the material flow direction. Figure 5 As shown, the axis of the first upper roller 111, the axis of the second upper roller 112, the axis of the first lower roller 121, and the axis of the second lower roller 122 are all perpendicular to the material flow direction 100. Preferably, the axis of the first upper roller 111, the axis of the second upper roller 112, the axis of the first lower roller 121, and the axis of the second lower roller 122 are all parallel to the horizontal plane. A guide plate is provided on the feeding side of the strip tail pressing device of the rolling mill to facilitate guiding the strip into the material flow roller gap.

[0060] In one embodiment of the present invention, the upper roller side-by-side mechanism 110 includes an upper bearing seat 113 disposed at both ends thereof, and both ends of the first upper roller 111 and both ends of the second upper roller 112 are respectively installed on the upper bearing seat 113 through bearings; the lower roller side-by-side mechanism 120 includes a lower bearing seat 123 disposed at both ends thereof, and both ends of the first lower roller 121 and both ends of the second lower roller 122 are respectively installed on the lower bearing seat 123 through bearings; the upper bearing seat 113 and the lower bearing seat 123 are both installed on the roller frame body 10.

[0061] like Figure 3 As shown, a frame hole is provided on the roller frame body 10, and an upper bearing seat 113 and a lower bearing seat 123 are provided in the frame hole and contact the side wall of the frame hole to define the radial position of the upper roller parallel mechanism 110 and the lower roller parallel mechanism 120. The roller frame body 10 is connected with a locking plate 14, which abuts against the upper bearing seat 113 and the lower bearing seat 123 respectively to define the axial position of the upper bearing seat 113 and the axial position of the lower bearing seat 123.

[0062] At least one of the upper roller parallel mechanism 110 and the lower roller parallel mechanism 120 can slide up and down in the roller frame body 10 to achieve the compression and release of the strip steel. Figure 3 As shown, a support seat 13 is provided in the roller frame body 10, and a lower bearing seat 123 is connected to the support seat 13 by bolts, so that the position of the lower roller parallel mechanism 120 is relatively fixed; the clamping drive mechanism 130 includes a tail clamping hydraulic cylinder 131 installed on the roller frame body 10, and the tail clamping hydraulic cylinder 131 is connected to the upper bearing seat 113 to drive the upper roller parallel mechanism 110 to move up and down. Please refer to Figure 6 and Figure 7 The upper bearing seat is provided with a coupling shaft 114 and a pin shaft 115, the pin shaft 115 is connected to the upper bearing seat 113 along the axial direction of the first upper roller 111, and passes through the coupling shaft 114 to connect the lower end of the coupling shaft 114 to the upper bearing seat 113, and the upper end of the coupling shaft 114 is connected to the piston rod of the tail pressing hydraulic cylinder 131. Preferably, the clamping drive mechanism 130 includes two tail pressing hydraulic cylinders 131, and the tail pressing hydraulic cylinders 131 are respectively connected to the upper bearing seats 113 located at both ends.

[0063] Furthermore, if Figure 6 and Figure 7 As shown, the lower side of the upper roller parallel mechanism 110 is connected with a limit screw 124 for abutting against the lower roller parallel mechanism 120, and / or, as shown in FIG. Figure 8 and Fig. 9 As shown, the upper side of the lower roller parallel mechanism 120 is connected with a limit screw 124 for abutting against the upper roller parallel mechanism 110 to limit the limit position of the upper roller parallel mechanism 110 moving downward and control the size of the pressing force on the strip.

[0064] The structures of various production equipment in the rolling line are usually compact, and the distance between the equipment is small. For this reason, the inventor has made further improvements to the strip tail pressing device of the rolling mill: the strip tail pressing device of the rolling mill includes a transverse moving device 20, which is connected to the roller frame body 10 and is used to drive the roller frame body 10 to move along the axial direction of the first lower roller 121, so that the roller frame body 10 can switch between the rolling tail pressing position and the maintenance position. When the roller frame body 10 moves to the rolling tail pressing position, the roller frame body 10 and each roller therein cooperate with the rolling mill in the rolling line to provide back tension; when the roller frame body 10 moves to the maintenance position, the roller frame body 10 leaves the rolling line, freeing up space for the front and rear equipment of the strip tail pressing device of the rolling mill, which is convenient for the inspection and maintenance of the strip tail pressing device and its front and rear equipment of the rolling mill.

[0065] Furthermore, the transverse movement device 20 includes a base 21, a transverse movement slide rail 23 installed on the base 21, and a transverse movement hydraulic cylinder 22. The roller frame body 10 is installed on the transverse movement slide rail 23, and the transverse movement hydraulic cylinder 22 is connected to the roller frame body 10 by transmission. Figure 1 As shown, after the piston rod of the transverse hydraulic cylinder 22 is extended, the roller frame 10 is pushed to the rolling tail position. The force and the overturning moment along the material flow direction 100 received by the roller frame 10 are borne by the transverse slide rail 23. A fixed baffle is provided at the end of the base 21 to constrain the lateral position of the roller frame 10. The roller frame 10 includes a sliding seat 12 and a frame body 11 fixed above the sliding seat 12, and the sliding seat 12 is fixed on the slider on the transverse slide rail 23.

[0066] After removing the locking plate 14, the bolts connecting the lower bearing seat 123 and the support seat 13, and the connecting shaft 114 and the pin shaft 115 connecting the upper bearing seat 113 and the tail hydraulic cylinder 131, the upper roller side-by-side mechanism 110 and the lower roller side-by-side mechanism 120 can be removed from the frame hole to facilitate the replacement of each roller.

[0067] like Figure 2 and Figure 3 As shown, the strip tail pressing device of the rolling mill includes a roll changing stand 30, and the transverse movement device 20 can drive the roller frame body 10 to move to connect with the roll changing stand 30, so as to facilitate the upper roller parallel mechanism 110 and the lower roller parallel mechanism 120 to be pulled onto the roll changing stand 30 along the axial direction of the first lower roller 121, thereby reducing the difficulty of operation.

[0068] In one embodiment of the present invention, the lower roller side-by-side mechanism 120 is provided with a roll-changing roller 125; the strip tail pressing device of the rolling mill includes a roll-changing beam frame 140 arranged below the roll-changing roller 125 and a lifting hydraulic cylinder 150 connected to the roll-changing beam frame 140, and the roll-changing beam frame 140 is provided with a sliding surface 141 extending along the axial direction of the first lower roller 121, and the lifting hydraulic cylinder 150 can drive the roll-changing beam frame 140 to move upward until the sliding surface 141 abuts against the roll-changing roller 125.

[0069] During disassembly, first remove the bolts connecting the lower bearing seat 123 and the support seat 13; then the lifting hydraulic cylinder 150 drives the roller changing beam frame 140 to rise, the sliding surface 141 contacts the roller changing roller 125, and the roller changing beam frame 140 carries the lower roller parallel mechanism 120; after removing the locking plate 14, the lower roller parallel mechanism 120 can be pushed or pulled on the sliding surface 141 to move along the axial direction of the first lower roller 121.

[0070] Specifically, when the lifting hydraulic cylinder 150 is retracted, a gap is provided between the sliding surface 141 and the roller changing roller 125. A track surface for carrying the roller changing roller 125 is provided on the top of the roller changing stand 30; when the lifting hydraulic cylinder 150 is extended, the sliding surface 141 and the track surface are located in the same plane, so that the lower roller parallel mechanism 120 can be pulled from the sliding surface 141 to the roller changing stand 30; preferably, when the lifting hydraulic cylinder 150 is extended, the roller changing crossbeam frame 140 lifts the lower roller parallel mechanism 120 upward for a distance, so that the lower bearing seat 123 is separated from the support seat 13, so as to facilitate the pulling of the lower roller parallel mechanism 120 to move.

[0071] The roll-changing beam frame 140 includes two parallel connected steel beams. Figure 3 and Fig.10 As shown, the end of the roller changing beam frame 140 away from the roller changing stand 30 is provided with an ejector screw 142. When the ejector screw 142 is rotated, the ejector screw 142 will move along the axial direction of the first lower roller 121, pushing the lower roller parallel mechanism 120 to move along the sliding surface 141, thereby reducing the difficulty of pulling the lower roller parallel mechanism 120 out of the frame hole.

[0072] In one embodiment of the present invention, a groove structure 127 is provided on the lower bearing seat 123 and the upper bearing seat 113; the strip tail pressing device of the rolling mill also includes a roll changing lock frame 160, such as Fig.11 and Fig.12As shown, a protrusion 161 is provided on the roller lock frame 160, and the groove structure 127 and the protrusion 161 are matched to form a mortise and tenon structure; the roller lock frame 160 is provided with a protruding edge 162 for buckling the long sides of the upper and lower bearing seats and a boss 163 for supporting the outer sides of the upper and lower bearing seats. Since the inner part of the bearing seat adopts a self-aligning roller bearing, the upper roller parallel mechanism 110 and the lower roller parallel mechanism 120 of the upper and lower double rollers are locked into one by the roller lock frame 160, which can prevent the bearing seat from tipping along the roller axis direction when pulled out, so that the roller lock frame 160 can be pulled to drive the lower roller parallel mechanism 120 to move out of the roller frame body 10. Preferably, a pull ring is provided on the roller lock frame 160.

[0073] Furthermore, during disassembly, the roll-changing locking frame 160 is installed on the top of the lower bearing seat 123; then the tail-pressing hydraulic cylinder 131 drives the upper roller parallel mechanism 110 to move downward until the upper bearing seat 113 contacts the roll-changing locking frame 160; then the connecting shaft 114 and the pin shaft 115 connecting the upper bearing seat 113 and the tail-pressing hydraulic cylinder 131 are removed, so that the upper bearing seat 113 falls onto the roll-changing locking frame 160. At this time, the upper bearing seat 113 and the lower bearing seat 123 are connected together through the roll-changing locking frame 160, so that the upper roller parallel mechanism 110 and the lower roller parallel mechanism 120 can be pulled onto the roll-changing stand 30 by pulling the roll-changing locking frame 160.

[0074] The tail hydraulic cylinder 131 and the lifting hydraulic cylinder 150 are connected with pipelines, and the pipelines will move with the movement of the moving parts of the device. Due to the compactness of the front and rear equipment and the limited space between the equipment, the pipelines need to be centrally planned and constrained by pipe clamps to avoid interference. Figure 1-Figure 4 As shown, the strip tail pressing device of the rolling mill includes a drag chain 402, a drag chain frame 403 and a crossbeam 401. The piping pipeline is arranged on the crossbeam 401 to facilitate access to the drag chain 402. The drag chain frame 403 is fixed on the ground or the end of the transverse moving device 20 close to the roll changing stand 30. The first end of the crossbeam 401 is fixed to the roller frame body 10, and the second end of the crossbeam 401 extends to the outer side of the roller frame body 10 close to the roll changing stand 30. The first end of the drag chain 402 is connected to the drag chain frame 403, and the second section of the drag chain 402 is connected to the crossbeam 401. The crossbeam 401 leads the pipeline outside the range of motion of the roller frame body 10 and then leads it into the drag chain 402, which can avoid interference between the pipeline and the roller frame body 10 and peripheral equipment.

[0075] Embodiment 2

[0076] The present invention provides a strip cold rolling system, which includes: a reversible rolling mill 4 and a strip tail pressing device 3 of the rolling mill. The strip tail pressing device 3 of the rolling mill is arranged on the feeding side of the reversible rolling mill 4 to provide post-tensioning force for the tail of the strip after tail swinging.

[0077] Specifically, the strip cold rolling system also includes an unwinder 1, a front coiler 2 and a rear coiler 5, please refer to Fig.13 , the uncoiler 1, the front coiler 2, the strip tail pressing device 3, the reversing mill 4 and the rear coiler 5 are sequentially distributed along the material flow direction 100. During the first rolling, the rear coiler 5 at the outlet side of the uncoiler 1 and the reversing mill 4 is first tensioned; after the uncoiling is completed, the strip tail is separated from the coiler 1, and the strip tail between the uncoiler 1 and the reversing mill 4 will be in a tension-free state for a long distance, at which time the strip tail pressing device 3 is activated; after the strip tail runs between the strip tail pressing device 3 and the front coiler 2, the strip tail returns to the front coiler 2 and is clamped by the reel jaws of the front coiler 2, at which time the tail pressing device is no longer activated, and a tension closed loop is formed by the front coiler 2, the reversing mill 4 and the rear coiler 5. The reversing mill 4 can be a single-frame reversing mill or a double-frame reversing mill.

[0078] The above are only several embodiments of the present invention. Those skilled in the art may make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A strip tail pressing device for a rolling mill, characterized in that: include: A roller frame, an upper roller parallel mechanism installed on the roller frame, a lower roller parallel mechanism and a pressing drive mechanism; the upper roller parallel mechanism includes a first upper roller and a second upper roller, an upper roller gap is provided between the first upper roller and the second upper roller; the lower roller parallel mechanism includes a first lower roller and a second lower roller, a lower roller gap is provided between the first lower roller and the second lower roller; and along the material flow direction, the first upper roller, the first lower roller, the second upper roller and the second lower roller are distributed in sequence; The clamping drive mechanism is used to drive the upper roller parallel mechanism and the lower roller parallel mechanism to move relatively closer or farther away; The lower roller parallel mechanism comprises a lower bearing seat for mounting the first lower roller and the second lower roller, and the lower bearing seat is mounted on the roller frame body; The lower bearing seat is fixed to the roller frame body; The roller frame body is detachably connected with a locking plate; the locking plate abuts against the lower bearing seat to limit the axial position of the lower bearing seat; The lower roller side-by-side mechanism is provided with a roller-changing wheel; The strip tail pressing device of the rolling mill includes a roll changing beam frame arranged below the roll changing roller and a lifting hydraulic cylinder connected to the roll changing beam frame, the roll changing beam frame is provided with a sliding surface extending along the axial direction of the first lower roller, and the lifting hydraulic cylinder can drive the roll changing beam frame to move upward until the sliding surface abuts against the roll changing roller; the roll changing beam frame lifts the lower roller side-by-side mechanism upward to separate the lower bearing seat from the support seat.

2. The strip tail pressing device of the rolling mill according to claim 1, characterized in that: An axis of the first upper roller, an axis of the second upper roller, an axis of the first lower roller, and an axis of the second lower roller are all perpendicular to the material flow direction.

3. The strip tail pressing device of the rolling mill according to claim 2, characterized in that: The lower side of the upper roller parallel mechanism is connected to a limit screw for abutting against the lower roller parallel mechanism, and / or the upper side of the lower roller parallel mechanism is connected to a limit screw for abutting against the upper roller parallel mechanism.

4. The strip tail pressing device of the rolling mill according to claim 1, characterized in that: The upper roller side-by-side mechanism comprises an upper bearing seat for mounting the first upper roller and the second upper roller, and the upper bearing seat is also mounted on the roller frame body.

5. The strip tail pressing device of the rolling mill according to claim 4, characterized in that: The clamping drive mechanism comprises a tail-pressing hydraulic cylinder installed on the roller frame body, and the tail-pressing hydraulic cylinder is connected to the upper bearing seat to drive the upper roller parallel mechanism to move up and down.

6. The strip tail pressing device of the rolling mill according to claim 4, characterized in that: The locking plate abuts against the upper bearing seat to limit the axial position of the upper bearing seat.

7. The strip tail pressing device of a rolling mill according to claim 1, characterized in that: The end of the roller changing cross beam frame is provided with an ejector screw for pushing the lower roller parallel mechanism to move along the sliding surface.

8. The strip tail pressing device of a rolling mill according to claim 1, characterized in that: A protruding structure is provided on the top of the lower bearing seat; the strip tail pressing device of the rolling mill includes a roll changing locking frame, and the roll changing locking frame can be locked with the protruding structure to be connected to the lower bearing seat.

9. The strip tail pressing device of a rolling mill according to claim 1, characterized in that: The strip tail pressing device of the rolling mill includes a transverse moving device, which is connected to the roller frame body and is used to drive the roller frame body to move along the axial direction of the first lower roller.

10. The strip tail pressing device of a rolling mill according to claim 9, characterized in that: The transverse movement device comprises a base, a transverse movement slide rail installed on the base, and a transverse movement hydraulic cylinder. The roller frame body is installed on the transverse movement slide rail, and the transverse movement hydraulic cylinder is transmission-connected to the roller frame body.

11. The strip tail pressing device of a rolling mill according to claim 10, characterized in that: The strip tail pressing device of the rolling mill includes a roll changing stand, the transverse movement device can drive the roll frame body to move to connect with the roll changing stand, and the upper roll side-by-side mechanism and the lower roll side-by-side mechanism can move to the roll changing stand.

12. The strip tail pressing device of a rolling mill according to claim 11, characterized in that: The strip tail pressing device of the rolling mill includes a drag chain, a drag chain frame and a crossbeam, wherein the drag chain frame is fixed; the first end of the crossbeam is fixed to the roller frame body, and the second end of the crossbeam extends to the outer side of the roller frame body close to the roll changing stand; the first end of the drag chain is connected to the drag chain frame, and the second section of the drag chain is connected to the crossbeam.

13. A strip cold rolling system, characterized in that: include: A reversible rolling mill and a strip tail pressing device of the rolling mill as described in any one of claims 1 to 12, wherein the strip tail pressing device of the rolling mill is arranged on the feeding side of the reversible rolling mill.

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