A multi-pass steel strip rolling apparatus and method

Abstract

The application provides a multi-pass steel strip rolling device, which comprises a rolling mill body, a winding device, a thickness detection device and an adjusting pressure roller device, the rolling mill body comprises a roller set, and the roller set is provided with a first roll opening and a second roll opening on both sides of the roll gap; the winding device comprises a first winding assembly and a second winding assembly, the thickness detection device is arranged between the rolling mill body and the winding device and is used for detecting the thickness of the steel strip; and the adjusting pressure roller device comprises a first adjusting assembly arranged at the first roll opening, and the first adjusting assembly comprises an upper adjusting roller set. The adjusting pressure roller device is arranged to make the steel strip be forcedly extruded before entering the roll gap of the roller set, so that the steel strip is pushed into the roll gap, and the rolling efficiency is ensured. In addition, the winding device and the thickness detection device are arranged, the two strip ends of the steel strip are fixed by the first winding assembly and the second winding assembly respectively, the steel strip is rolled back and forth in the rolling mill body, repeated feeding and discharging operations of the steel strip are avoided, and the rolling efficiency is improved.

Description

Technical Field

[0001] This invention relates to the technical field of steel strip production, and more specifically, to a multi-pass rolling steel strip equipment and method. Background Technology

[0002] During the rolling process, the force exerted by the rolls on the steel strip has two simultaneous effects: dragging the strip into the roll gap while simultaneously causing it to undergo plastic deformation. Provided the yield condition is met, whether the rolling process can begin depends on whether the rolls can drag the steel strip into the roll gap.

[0003] During the rolling process, the height of the steel strip decreases. The volume of the steel strip that decreases in height is transferred to the width and length directions of the steel strip. This deformation process not only determines the size of the rolled steel strip, but also affects the speed at which the steel strip enters and exits the rolls.

[0004] During the rolling process, the greater the reduction, the wider the strip becomes. However, the strip is also quite hard. In actual production, the strip usually needs to be rolled through multiple passes. If the reduction of the roll set is too small, the strip will be difficult to be pulled into the roll gap, which is not conducive to the rolling process and will affect production efficiency. Summary of the Invention

[0005] Therefore, in order to solve the problem that when the roll reduction of the above-mentioned steel strip rolling equipment is too small, it is difficult for the steel strip to be dragged into the roll gap, which is not conducive to the rolling process, the present invention provides a multi-pass steel strip rolling equipment and method, the specific technical solution of which is as follows:

[0006] On one hand, a multi-pass rolling steel strip equipment includes a rolling mill body, a winding device, a thickness detection device, and an adjusting pressure roll device. The rolling mill body includes a roll group, with a first roll opening and a second roll opening on both sides of the roll gap of the roll group. The winding device includes a first winding assembly and a second winding assembly, with the first winding assembly disposed on one side of the first roll opening and the second winding assembly disposed on one side of the second roll opening. The thickness detection device is disposed between the rolling mill body and the winding device and is used to detect the thickness of the steel strip. The adjusting pressure roll device includes a first adjusting assembly disposed at the first roll opening, the first adjusting assembly including an upper adjusting roll group, and the roll pressure of the upper adjusting roll group is adjusted by adjusting the downward pressure height of the upper adjusting roll group.

[0007] The aforementioned multi-pass rolling steel strip equipment uses an adjustable pressure roller device to compress the steel strip before it enters the roll gap of the rolling mill. When the roll reduction is too small, the steel strip is pushed into the roll gap, thus ensuring rolling efficiency. In addition, by setting up a winding device and a thickness detection device, the first winding assembly and the second winding assembly fix the two ends of the steel strip respectively, allowing the steel strip to be rolled back and forth in the main body of the mill, avoiding repeated loading and unloading operations. Then, the rolling mill, in conjunction with the steel strip thickness data detected by the thickness detection device, adjusts the reduction amount through the control terminal to realize multi-pass rolling of the steel strip, thereby improving rolling efficiency.

[0008] Furthermore, the main body of the rolling mill includes a rolling mill stand, and the rolling mill stand is provided with an installation groove; the first adjustment component includes a pressing component disposed on both sides of the upper adjusting roll group, the pressing component includes a pressing cylinder and a bearing seat, and the bearing seat is disposed in the installation groove; the pressing cylinder drives the bearing seat to move within the installation groove.

[0009] Furthermore, the first adjustment assembly also includes an adjustment wedge and a buffer. The bottom of the bearing seat is provided with an adjustment slope adapted to the adjustment wedge. The adjustment wedge is provided with a mounting hole adapted to the buffer. The buffer is used to buffer the tendency of the adjustment wedge to move outward from the first roller opening when subjected to force.

[0010] Furthermore, the buffer is a spring, and the mill stand is provided with an adjustment group for adjusting the spring force; one end of the spring is fitted into the mounting hole, and the other end is in contact with the adjustment group.

[0011] Furthermore, the main body of the rolling mill includes a support assembly and a gap adjustment assembly. The roll set includes two rolling rolls, which are rotatably connected to the support assembly and form a roll gap between them. The two rolling rolls rotate synchronously in opposite directions to drive the steel strip through the roll gap. The gap adjustment assembly is sleeved on both ends of the rolling roll and is respectively disposed on two opposite sides of the support assembly. The gap adjustment assembly is used to absorb the circular runout of the rolling roll caused by uneven steel strip thickness.

[0012] Furthermore, the conveying and adjusting pressure roller device also includes a second adjusting component disposed at the second roller opening.

[0013] Furthermore, the thickness detection device includes symmetrically arranged detection components; the detection components include an infrared ranging sensor, a support member, an elastic member, and a movable member. The movable member moves away from the support member and contacts the steel strip through the elastic force of the elastic member. The infrared ranging sensor detects the thickness of the steel strip by detecting the change in distance between the movable member and the support member.

[0014] Furthermore, the second winding assembly includes a winding host, a roll assembly, and an auxiliary feeding assembly. The roll assembly is rotatably mounted on the winding host, and the auxiliary feeding assembly is hinged to the winding host. The roll assembly includes a hydraulic push rod and a roll body disposed on the hydraulic push rod. The roll body is switched between an open state and a closed state by the thrust of the hydraulic push rod. In the open state, the roll body is opened into several roll arc blocks, and clamping gaps are provided between the roll arc blocks. The auxiliary feeding assembly is used to roll the steel strip roll on the roll assembly and feed the steel strip end into the clamping gap.

[0015] On the other hand, a method for multi-pass rolling of steel strip includes the following steps:

[0016] S1. The steel strip coil is fixed to the first winding assembly.

[0017] S2. Raise the roll gap to allow the steel strip to pass through the roll group and fix the end of the steel strip to the second winding assembly.

[0018] S3. Adjust the downward pressure height of the upper roller group in the adjusting pressure roller device to form a roller pressure height difference with the main roller group of the rolling mill.

[0019] S31. The thickness of the steel strip is detected by a thickness detection device.

[0020] S32. The hydraulic system controls the oil pressure of the lowering cylinder, controls the extension of the cylinder rod of the lowering cylinder, and thus controls the roller pressure of the upper adjusting roller group, thereby controlling the roller pressure of the upper adjusting roller group on the steel strip.

[0021] S4. The strip is retracted through the first and second winding assemblies, and the roll gap of the main roll group and the rolling height of the upper roll group are adjusted simultaneously to enable the steel strip to undergo multiple rolling passes. Attached Figure Description

[0022] The invention will be further understood from the following description taken in conjunction with the accompanying drawings. The components in the drawings are not necessarily drawn to scale, but rather the emphasis is on illustrating the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0023] Figure 1 This is a schematic diagram of the structure of a multi-pass rolling strip equipment according to an embodiment of the present invention;

[0024] Figure 2 This is a rolling strip equipment according to an embodiment of the present invention. Figure 1 Enlarged view of the structure at point E in the middle;

[0025] Figure 3 This is a rolling strip equipment according to an embodiment of the present invention. Figure 2 Magnification of the structure at point F Figure 1 ;

[0026] Figure 4 This is a rolling strip equipment according to an embodiment of the present invention. Figure 2 Magnification of the structure at point F Figure 2 ;

[0027] Figure 5 This is a thickness detection device according to an embodiment of the present invention. Figure 3 Enlarged view of the structure at point G in the middle;

[0028] Figure 6 This is a schematic diagram of the structure of the second winding assembly according to an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1-Rolling mill body, 2-Rewinding device, 3-Thickness detection device, 4-Adjusting pressure roll device;

[0031] 101 - First roller inlet, 102 - Second roller inlet;

[0032] 11-Roll set, 12-Mill stand, 13-Support assembly, 14-Gap adjustment assembly;

[0033] 111 - Rolling roll;

[0034] 121 - Mounting slot; 122 - Adjustment assembly;

[0035] 21-First winding assembly, 22-Second winding assembly;

[0036] 221-Rewinding unit, 222-Roll assembly, 223-Auxiliary winding assembly;

[0037] 2221 - Hydraulic push rod, 2222 - Drum body;

[0038] 31-Detection component;

[0039] 311-Infrared ranging sensor; 312-Support component; 313-Elastic component; 314-Moving component;

[0040] 41-First adjustment component, 42-Second adjustment component;

[0041] 411-Upward adjusting roller assembly, 412-Downward pressing assembly, 413-Adjusting wedge block, 414-Buffer component;

[0042] 4121 - Lowering cylinder, 4122 - Bearing housing. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of protection of the invention.

[0044] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0046] In this invention, "first" and "second" do not represent a specific quantity or order, but are merely used to distinguish names.

[0047] On the one hand, such as Figure 1 and Figure 2 As shown, a multi-pass rolling strip equipment according to an embodiment of the present invention includes a rolling mill body 1, a winding device 2, a thickness detection device 3, and an adjusting pressure roller device 4. The rolling mill body 1 includes a roll group 11, with a first roll opening 101 and a second roll opening 102 on both sides of the roll gap of the roll group 11. The winding device 2 includes a first winding assembly 21 and a second winding assembly 22, with the first winding assembly 21 disposed on one side of the first roll opening 101 and the second winding assembly 22 disposed on one side of the second roll opening 102. The thickness detection device 3 is disposed between the rolling mill body 1 and the winding device 2 and is used to detect the thickness of the steel strip. The adjusting pressure roller device 4 includes a first adjusting assembly 41 disposed at the first roll opening 101, with the first adjusting assembly 41 including an upper adjusting roller group 411, the roller pressure of which is adjusted by adjusting the downward pressing height of the upper adjusting roller group 411.

[0048] The aforementioned multi-pass rolling steel strip equipment uses an adjusting pressure roller device 4 to compress the steel strip before it enters the roll gap of the roll group 11. When the pressure of the roll group 11 is too small, the steel strip is pushed into the roll gap, thus ensuring rolling efficiency. In addition, by setting up a winding device 2 and a thickness detection device 3, the first winding assembly 21 and the second winding assembly 22 respectively fix the two ends of the steel strip, so that the steel strip is rolled back and forth in the main body of the rolling mill 1, avoiding repeated loading and unloading operations. Then, the roll group 11, in conjunction with the steel strip thickness data detected by the thickness detection device 3, adjusts the pressure through the control terminal to realize multi-pass rolling of the steel strip, thereby improving rolling efficiency.

[0049] like Figure 3 and Figure 4 As shown, in one embodiment, the mill body 1 includes a mill stand 12 with an mounting groove 121. The first adjusting assembly 41 includes pressing assemblies 412 disposed on both sides of the upper adjusting roll group 411. The pressing assembly 412 includes a pressing cylinder 4121 and a bearing seat 4122, with the bearing seat 4122 disposed in the mounting groove 121. The pressing cylinder 4121 drives the bearing seat 4122 to move within the mounting groove 121. Thus, by controlling the oil pressure of the pressing cylinder 4121 through the hydraulic system, the extension amount of the cylinder rod of the pressing cylinder 4121 is controlled, thereby controlling the roll pressure of the upper adjusting roll group 411, increasing the roll pressure of the upper adjusting roll group 411 on the steel strip, facilitating the pushing of the steel strip into the roll gap, and thus ensuring rolling efficiency.

[0050] In one embodiment, the mounting groove 121 is set at an angle to the vertical line of rolling, with the angle ranging from 0° to 60°. Furthermore, by setting the mounting groove 121 at an angle, the rolling pressure of the upper adjusting roll group 411 on the steel strip is decomposed into vertical and horizontal forces. The horizontal force is used to push the steel strip into the roll gap, thereby ensuring rolling efficiency.

[0051] In one specific embodiment, the included angle is 30°. This ensures that the upper adjusting roller group 411 has a certain pre-compression effect on the steel strip, while also ensuring that the upper adjusting roller group 411 pushes the steel strip into the roller gap.

[0052] like Figure 3 and Figure 4 As shown, in one embodiment, the first adjusting assembly 41 further includes an adjusting wedge 413 and a buffer member 414. The bottom of the bearing seat 4122 is provided with an adjusting inclined surface adapted to the adjusting wedge 413. The adjusting wedge 413 is provided with a mounting hole adapted to the buffer member 414. The buffer member 414 is used to buffer the tendency of the adjusting wedge 413 to move outward from the first roller opening 101 under force. In this way, the direction of the force applied to the bearing seat 4122 can be adjusted by adjusting the adjusting wedge 413, that is, the force applied along the mounting groove 121 is adjusted to the outside of the first roller opening 101, thereby facilitating the adjustment of the buffering strength of the buffer member 414.

[0053] In one embodiment, the buffer 414 is a spring, and the mill stand 12 is provided with an adjustment group 122 for adjusting the spring force; one end of the spring is fitted into a mounting hole, and the other end is in contact with the adjustment group 122. Thus, by controlling the position of the adjustment group 122, the compression of the spring is adjusted, thereby adjusting the buffering strength of the buffer 414.

[0054] In one embodiment, the adjustment group 122 includes an adjustment block, which has a positioning part and a pressing part. The positioning part has a spring positioning hole. The mill stand 12 has an adjustment channel. The spring and the adjustment block are arranged in the adjustment channel. Specifically, the fixing member passes through the threaded hole on the mill stand 12 and uses the force in the direction of thread screwing to press the adjustment block to adjust the buffer strength of the buffer member 414.

[0055] In one embodiment, the adjustment assembly 122 includes an eccentric protrusion. Thus, by rotating the eccentric protrusion, the convex surface presses against the adjustment block, thereby adjusting the cushioning strength of the buffer 414.

[0056] In one embodiment, the mill body 1 includes a support assembly 13 and a gap adjustment assembly 14. The roll set 11 includes two rolling rolls 111, which are rotatably connected to the support assembly 13, forming a roll gap between them. The two rolling rolls 111 rotate synchronously in opposite directions to drive the steel strip through the roll gap. Gap adjustment assemblies 14 are respectively fitted onto both ends of the rolling rolls 111, and are respectively disposed on two opposite sides of the support assembly 13. The gap adjustment assemblies 14 are used to absorb the circular runout of the rolling rolls 111 caused by uneven steel strip thickness. Specifically, the gap adjustment assembly 14 absorbs the radial force generated by the circular runout through a damping element or a compression spring. Thus, by absorbing the circular runout of the rolling rolls 111 caused by uneven steel strip thickness, the circular runout of the rolling rolls 111 prevents stress on the support assembly 13 and reduces its service life.

[0057] In one embodiment, the support assembly 13 is a bearing bracket, and the gap adjustment assembly 14 is a spring sleeve column, which is a guide column fitted with a spring. The bearing bracket is provided with a guide hole adapted to the guide column. In this way, the roll gap between the two rolling rolls 111 is adjusted by moving the two bearing brackets closer to or further apart from each other. Through the guiding action of the guide hole and the guide column, the rolling vertical lines of the two rolling rolls 111 are kept in a vertical plane.

[0058] In one embodiment, the conveying and adjusting pressure roller device 4 further includes a second adjusting component 42 disposed at the second roll opening 102. Specifically, the second adjusting component 42 and the first adjusting component 41 are symmetrically arranged along the rolling center of the roll group 11. Thus, by providing the second adjusting component 42, the steel strip can be pushed by the second adjusting component 42 and enter the roll gap from the second roll opening 102, thereby realizing the back-and-forth rolling of the steel strip in the main body of the rolling mill 1 and improving production efficiency.

[0059] like Figure 5As shown, in one embodiment, the thickness detection device 3 includes detection components 31 symmetrically arranged along the steel strip's forward direction. The detection components 31 include an infrared ranging sensor 311, a support member 312, an elastic member 313, and a movable member 314. The movable member 314 moves away from the support member 312 and contacts the steel strip due to the elastic force of the elastic member 313. The infrared ranging sensor 311 detects the steel strip thickness by detecting changes in the distance between the movable member 314 and the support member 312. Thus, by pressing the steel strip with the two sets of detection components 31 of the thickness detection device 3, the steel strip is horizontally fed into the rolling mill body 1. Since the movable member 314 is in direct contact with the steel strip, when the steel strip thickness varies, the infrared ranging sensor 311 detects changes in the distance between the movable member 314 and the support member 312 to detect the steel strip thickness.

[0060] In one embodiment, the detection assembly 31 further includes a screw 315 and a tension spring 316. Symmetrical through holes are provided on the support member 312. One end of the screw 315 is connected to the through hole, and the tension spring is fitted around the outer periphery of the screw 315. The other end of the screw 315 is connected to a threaded hole on the movable member 314. The infrared ranging sensor 311 includes an infrared transmitter and an infrared signal receiver. The infrared transmitter is disposed on the lower base surface of the support member 312, and the corresponding infrared signal receiver is disposed on the upper base surface of the movable member 314. Specifically, the end face of the movable member 314 that contacts the steel strip has a groove, and a roller that can rotate relative to the movable member 314 is disposed within the groove. Thus, the roller contacts the steel strip, preventing the movable member 314 from scratching the steel strip and affecting the production quality of the steel strip.

[0061] In one embodiment, the roller is a nylon roller. This results in minimal deformation of the nylon roller, facilitating rolling contact with the steel belt.

[0062] like Figure 6 As shown, in one embodiment, the second winding assembly 22 includes a winding host 221, a roll assembly 222, and an auxiliary feeding assembly 223. The roll assembly 222 is rotatably mounted on the winding host 221, and the auxiliary feeding assembly 223 is hinged to the winding host 221. The roll assembly 222 includes a hydraulic push rod 2221 and a roll body 2222 disposed on the hydraulic push rod 2221. The roll body 2222 is switched between an open state and a closed state by the thrust of the hydraulic push rod 2221. In the open state, the roll body 2222 is opened into several roll arc blocks, and a clamping gap is provided between the roll arc blocks. The auxiliary feeding assembly 223 is used to roll the steel strip roll on the roll assembly 222 and feed the steel strip end into the clamping gap. In this way, by clamping the end of the steel strip with the main body 2222, the end of the steel strip is prevented from detaching from the second winding assembly 22 and needing to be re-entered into the rolling gap, which facilitates the stable rolling of the steel strip back and forth in the main body 1 of the rolling mill.

[0063] In one embodiment, the auxiliary feeding assembly 223 is equipped with an electrically driven feeding roller, which is driven by a servo motor to feed the end of the steel strip into the clamping gap of the drum body 2222. Specifically, the electrically driven feeding roller includes a rubber roller body. Thus, after the rubber roller body presses the steel strip, the friction is large, which facilitates the feeding action of the steel strip end.

[0064] On the other hand, a method for multi-pass rolling of steel strip includes the following steps:

[0065] S1. The steel strip coil is fixed to the first winding assembly.

[0066] S2. Raise the roll gap to allow the steel strip to pass through the roll group and fix the end of the steel strip to the second winding assembly.

[0067] S3. Adjust the downward pressure height of the upper roller group in the adjusting pressure roller device to form a roller pressure height difference with the main roller group of the rolling mill.

[0068] S31. The thickness of the steel strip is detected by a thickness detection device;

[0069] S32. The hydraulic system controls the oil pressure of the lowering cylinder, controls the extension of the cylinder rod of the lowering cylinder, and thus controls the roller pressure of the upper adjusting roller group, thereby controlling the roller pressure of the upper adjusting roller group on the steel strip.

[0070] S4. The strip is retracted through the first and second winding assemblies, and the roll gap of the main roll group and the rolling height of the upper roll group are adjusted simultaneously to enable the steel strip to undergo multiple rolling passes.

[0071] The aforementioned multi-pass rolling method for steel strip utilizes an adjustable pressure roller device to compress the steel strip before it enters the roll gap of the rolling mill. When the roll reduction is too small, the steel strip is pushed into the roll gap, ensuring rolling efficiency. Furthermore, by incorporating a winding device and a thickness detection device, the first and second winding assemblies respectively fix the two ends of the steel strip, allowing it to be rolled back and forth within the mill body. This avoids repeated loading and unloading operations. The rolling mill, in conjunction with the thickness data detected by the thickness detection device, adjusts the reduction amount via a control terminal to achieve multi-pass rolling of the steel strip, thereby improving rolling efficiency.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A multi-pass rolling steel strip equipment, characterized in that, include: The main body of the rolling mill includes a roll group, wherein a first roll opening and a second roll opening are provided on both sides of the roll gap of the roll group; The winding device includes a first winding assembly and a second winding assembly, wherein the first winding assembly is disposed on one side of the first roller opening and the second winding assembly is disposed on one side of the second roller opening; A thickness detection device is installed between the main body of the rolling mill and the winding device to detect the thickness of the steel strip; The pressure roller adjustment device includes a first adjustment component disposed at the first roller opening. The first adjustment component includes an upper adjustment roller group, and the roller pressure of the upper adjustment roller group is adjusted by adjusting the downward pressure height of the upper adjustment roller group. The main body of the rolling mill includes a rolling mill frame, and the rolling mill frame is provided with an installation groove; The first adjustment assembly includes a pressing assembly disposed on both sides of the upper adjustment roller group. The pressing assembly includes a pressing cylinder and a bearing seat, and the bearing seat is disposed in the mounting groove. The downward pressure cylinder drives the bearing seat to move within the mounting groove; The first adjustment assembly also includes an adjustment wedge and a buffer, and the bottom of the bearing seat is provided with an adjustment slope adapted to the adjustment wedge; The adjusting wedge is provided with mounting holes for a buffer component, which is used to buffer the tendency of the adjusting wedge to move outward from the first roller opening when subjected to force.

2. The multi-pass rolling strip equipment according to claim 1, characterized in that, The buffer component is a spring, and the mill stand is provided with an adjustment group for adjusting the spring force. One end of the spring is fitted into the mounting hole, and the other end is in contact with the adjustment assembly.

3. The multi-pass rolling strip equipment according to claim 1, characterized in that, The main body of the rolling mill includes a support assembly and a gap adjustment assembly. The roll group includes two rolling rolls, which are rotatably connected to the support assembly and form a roll gap between them. The two rolling rolls rotate synchronously in opposite directions to drive the steel strip through the roll gap. The two ends of the rolling rolls are respectively fitted with the gap adjustment components, and the gap adjustment components are respectively disposed on two opposite sides of the support assembly. The gap adjustment components are used to absorb the circular runout of the rolling rolls caused by the uneven thickness of the steel strip.

4. The multi-pass rolling strip equipment according to claim 1, characterized in that, The adjusting roller device also includes a second adjusting component disposed at the second roller opening.

5. A multi-pass rolling strip equipment according to claim 1, characterized in that, The thickness detection device includes symmetrically arranged detection components; The detection component includes an infrared ranging sensor, a support member, an elastic member, and a movable member. The movable member moves away from the support member and comes into contact with the steel strip by the elastic force of the elastic member. The infrared ranging sensor detects the thickness of the steel strip by detecting the change in distance between the movable member and the support member.

6. A multi-pass rolling strip equipment according to claim 1, characterized in that, The second winding assembly includes a winding host, a roll assembly, and an auxiliary winding feed assembly. The roll assembly is rotatably mounted on the winding host, and the auxiliary winding feed assembly is hinged to the winding host. The drum assembly includes a hydraulic push rod and a drum body disposed on the hydraulic push rod. The drum body is switched between an open state and a closed state by the thrust of the hydraulic push rod. In the open state, the drum body is opened into a plurality of drum arc blocks, and a clamping gap is provided between the drum arc blocks. The auxiliary feeding group is used to roll the steel strip coil on the drum group and feed the steel strip end into the clamping gap.

7. A method for multi-pass rolling of steel strip, used in the multi-pass rolling equipment as described in any one of claims 1-6, characterized in that, Includes the following steps: The steel strip coil is fixed to the first winding assembly; The gap between the rollers is increased so that the steel strip passes through the roll group and the end of the steel strip is fixed in the second winding assembly; Adjust the downward pressure height of the upper roller group in the adjusting pressure roller device to form a roller pressure height difference with the main roller group of the rolling mill; The strip is retracted by the first and second winding assemblies, and the roll gap of the main roll group and the rolling height of the upper roll group are adjusted simultaneously to enable the steel strip to undergo multiple rolling passes.

8. A method for multi-pass rolling of steel strip according to claim 7, characterized in that, The step of adjusting the downward pressure height of the upper roller group in the adjusting pressure roller device to form a roller pressure height difference with the main roller group of the rolling mill specifically includes the following steps: The thickness of the steel strip is detected using a thickness detection device; The hydraulic system controls the oil pressure of the lowering cylinder, thereby controlling the extension of the cylinder rod and thus the roller pressure of the upper roller group, and finally the roller pressure of the upper roller group on the steel strip.

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