A thickness control device for the finishing zone in hot-rolled strip steel production

Abstract

This invention relates to a thickness control device for the finishing zone in hot-rolled strip steel production, belonging to the field of hot-rolled strip steel processing technology. This device aims to solve the problem of roll gap "bouncing" caused by the compressibility of hydraulic fluid in existing pure hydraulic thickness control devices, as well as the difficulty in achieving "pulling and rolling combination" in the production of extremely thin strip steel. The device includes a mill stand, a lower lifting mechanism, and a lower pressing actuator. The lower lifting mechanism drives mutually cooperating lower and upper wedges through a hydraulic cylinder, converting horizontal thrust into vertical lifting force to raise the lower roll system. The lower pressing actuator includes a lifting bracket driven by hydraulic cylinder II, with a positioning through hole on its side and a mechanical locking device controlled by a drive cam. After the roll gap is set, the positioning through hole can be inserted to lock the lifting bracket, thereby suppressing hydraulic bounce and stabilizing the roll gap. In addition, the device also includes a tension roll system that can form an S-shaped path, which can apply adjustable tension to the strip steel to assist in rolling thinning.

Description

Technical Field

[0001] This invention belongs to the field of hot-rolled strip steel processing technology, and relates to a thickness control device for the finishing zone in hot-rolled strip steel production. Background Technology

[0002] The finishing rolling process of hot-rolled strip steel is the core link that determines the final thickness accuracy, surface quality and mechanical properties of the strip steel. Especially for the production of ultra-thin strip steel below 0.8mm, extremely high requirements are placed on the stability, adjustment accuracy and adaptability of the finishing rolling zone thickness control device. At present, the mainstream finishing rolling zone thickness control device in the industry mainly relies on the mill stand as the main support. The roll gap is adjusted by the hydraulic pressing mechanism and the lifting mechanism, and the rolling power is provided by the main drive roll. At the same time, a simple guide structure is used to ensure smooth strip steel conveying.

[0003] Existing equipment relies heavily on purely hydraulic drive mechanisms for thickness adjustment, with hydraulic pressing cylinders and lifting cylinders directly bearing the rolling force and controlling the roll gap opening. However, hydraulic oil itself is compressible, and under the influence of high-frequency rolling force fluctuations, the oil column is prone to elastic deformation similar to a spring, causing the mill to "bounce," making it impossible to maintain a stable roll gap. This results in a larger thickness tolerance for the strip, making it difficult to meet the high-precision production requirements of ultra-thin strips.

[0004] In the production of ultra-thin strip steel, relying solely on roll extrusion for thinning has significant limitations: rolling resistance is high and the strip steel is prone to sticking to the roll surface, which not only affects the surface quality of the strip steel but may also lead to equipment failure. To alleviate this problem, existing equipment usually sets up a looper between the stands to maintain micro-tension of the strip steel. However, such loopers can only store the strip steel and balance the speed difference between the stands. They can only maintain weak tension and cannot generate sufficiently large tensile deformation force. They cannot actively participate in strip steel thinning through tension and it is difficult to achieve a "pulling and rolling combined" thinning mode. The thinning efficiency and quality of ultra-thin strip steel are both constrained.

[0005] Therefore, we propose a thickness control device for the finishing zone in hot-rolled strip production to solve the problems mentioned above. Summary of the Invention

[0006] In view of this, in order to solve the above problems, the present invention provides a finishing zone thickness control device for hot-rolled strip steel production.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a thickness control device for the finishing zone in hot-rolled strip steel production, comprising:

[0008] Rolling mill archway;

[0009] The lower lifting mechanism is installed at the lower part of the rolling mill stand and is used to drive the lower pressure roller II, main drive roller and pressure roller I to move upward;

[0010] The downward pressing actuator is installed on the upper part of the mill stand and is used to drive the upper pressure roll I, pressure roll II and main drive roll to move downward so as to cooperate with the lower roll system to perform fine rolling on the strip.

[0011] The pressing actuator includes an installation frame fixed inside the rolling mill stand, a hydraulic cylinder II installed on the top of the installation frame, and a vertically arranged lifting bracket driven by the hydraulic cylinder II.

[0012] The mounting frame is equipped with a mechanical locking device, and the side of the lifting bracket is provided with a positioning through hole;

[0013] When the lifting bracket moves to the target position, the mechanical locking device can be inserted into the positioning through hole to lock the lifting bracket relative to the mounting frame, thereby suppressing the roller gap fluctuation caused by the compressibility of hydraulic oil.

[0014] As a further improvement to the above technical solution:

[0015] The lower lifting mechanism includes mounting bases fixed to both sides of the rolling mill stand, hydraulic cylinder I hinged to the top of the mounting base, a lower wedge block slidably disposed within the rolling mill stand, and an upper wedge block slidably disposed on the top of the lower wedge block.

[0016] The piston rod end of the hydraulic cylinder I is hinged to the corresponding lower wedge and upper wedge respectively, so that the hydraulic cylinder I drives the lower wedge and the upper wedge to slide relative to each other, and then converts the horizontal thrust into the vertical lifting force through the inclined plane cooperation.

[0017] It also includes a tension roller system, which includes two sets of extension brackets fixed to the strip inlet and outlet sides of the mill stand, rotating support plates rotatably mounted on the outer ends of the two extension brackets on the same side via rotating shafts, and upper and lower sets of guide rollers rotatably mounted between the two rotating support plates on the same side, forming a strip guide channel for the strip to pass through between the upper and lower sets of guide rollers.

[0018] The pressing actuator also includes a connecting bracket, and a wedge adjustment mechanism is provided between the top of the connecting bracket and the bottom of the lifting bracket;

[0019] The wedge adjustment mechanism includes a fixed base fixed to the top of the connecting bracket, a lower adjusting wedge slidably disposed on the top of the fixed base, and an upper adjusting wedge fixed to the bottom of the lifting bracket and having an inclined surface that cooperates with the lower adjusting wedge.

[0020] The fixed base is equipped with a drive assembly that drives the lower adjusting wedge to slide horizontally, thereby driving the lifting bracket and the upper roller system connected to it to make micro-displacement adjustments in the vertical direction through the inclined surface to compensate for roller wear.

[0021] The driving assembly includes an adjusting screw that rotates through the fixed base and an adjusting base threaded onto the adjusting screw. A disc spring assembly is provided between the adjusting base and the lower adjusting wedge. Rotating the adjusting screw can drive the adjusting base to move, thereby pushing the lower adjusting wedge to slide through the disc spring assembly.

[0022] It also includes a support bracket set between the two sets of rolling mill stands, wherein two swing plates are symmetrically rotatably mounted on the inner side of the support bracket, and both ends of the swing plates are provided with waist-shaped through holes;

[0023] A connecting column II is fixed to the outer side of the rotating support plate, and the connecting column II extends into the waist-shaped through hole at the corresponding side end of the swing support plate.

[0024] Hydraulic cylinders IV are hinged to both sides of the support bracket, and the piston rod end of the hydraulic cylinder IV is hinged to the corresponding connecting column II.

[0025] The hydraulic cylinder IV can drive the swing support plate to swing, and then through the cooperation of the waist-shaped through hole and the connecting column II, drive the rotating support plates on the inlet side and the outlet side to rotate in opposite directions, so that the guide roller forms an S-shaped path to apply tension to the strip steel.

[0026] The mechanical locking device includes a rotating disk rotatably mounted on the bottom wall of the mounting frame, a drive cam fixed to the top of the rotating disk, a hydraulic cylinder III hinged to the bottom wall of the mounting frame for driving the rotating disk to rotate, and a positioning rod that slides horizontally through both sides of the mounting frame and whose inner end abuts against the contour of the drive cam.

[0027] A reset spring is fitted on the positioning rod. When the hydraulic cylinder III drives the rotating disk to rotate, the protrusion of the driving cam pushes the positioning rod outward and inserts it into the positioning through hole.

[0028] The mill stand is fixedly provided with a limiting seat I. Piston rods I are slidably installed on the top and bottom of the limiting seat I. The output ends of the two piston rods I at the same height are connected to bearing seats I. The pressure roller II is rotatably installed between the two corresponding bearing seats I.

[0029] Limiting seat I is also fixedly provided with limiting seat II at both the upper and lower ends. A piston rod II slides through the limiting seat II. The output ends of the two piston rods II at the same height are fixed with bearing seats II. The main drive roller is rotatably installed between the two corresponding bearing seats II.

[0030] The top of the upper wedge block contacts the bottom of the lower bearing housing I, bearing housing II, and bearing housing III for mounting the lower pressure roller I in sequence to transmit the lifting force.

[0031] The bottom of the lifting bracket is fixed with connecting columns I on both sides. The side of the connecting bracket is provided with a vertical adjustment through hole for the connecting columns I to pass through, so that the connecting bracket can have a small floating space in the vertical direction relative to the lifting bracket.

[0032] The initial planes of the rotating support plates on the inlet and outlet sides are oriented in opposite directions, and the strip steel guide channels on both sides are on the same horizontal line.

[0033] The beneficial effects of this invention are as follows:

[0034] 1. The present invention discloses a thickness control device for the finishing zone of hot-rolled strip steel production. The lower lifting mechanism decomposes the thrust of the hydraulic cylinder into a vertical lifting force through the inclined surface cooperation of the lower wedge block and the upper wedge block. This can drive the lower pressure roller and the main drive roller to move synchronously and smoothly, avoid the offset or misalignment of the roller system components, ensure that the roll gap is uniform in the width direction, and prevent the strip steel thickness from deviating due to uneven local roll gap.

[0035] 2. The present invention discloses a thickness control device for the finishing zone of hot-rolled strip steel production, and a mechanical positioning device for the pressing actuator, which can lock the position of the lifting bracket after it moves to the target position by the cooperation of the positioning rod and the positioning through hole, thereby reducing the "bouncing" problem caused by hydraulic oil compression, reducing the fluctuation range of the roll gap during the rolling process, and controlling the thickness tolerance of the strip steel after finishing to a smaller range.

[0036] 3. The present invention discloses a thickness control device for the finishing zone of hot-rolled strip steel production, which connects the support bracket and the lifting bracket. The wedge adjustment mechanism can push the lower adjustment wedge to slide by simply rotating the adjustment screw. With the help of the inclined plane, the small displacement adjustment of the upper roller system can be achieved, which can compensate for the wear of the roller body after long-term use. The roller gap accuracy can be maintained without replacing the parts. At the same time, the disc spring assembly can absorb the impact vibration during the rolling process and reduce the impact of roller system sway on thickness control.

[0037] 4. The finishing zone thickness control device for hot-rolled strip steel production disclosed in this invention, through the strip steel guiding channel formed by the guide rollers, allows the strip steel to enter and exit the mill in a straight line, avoiding deviation or scratches during strip steel transportation. When processing extremely thin strip steel, the hydraulic cylinder IV drives the connecting column II to move, causing the swing support plate and the rotating support plate to rotate, so that the guide rollers form an S-shaped path, allowing the strip steel to obtain stable tension during the passage. It can work in conjunction with the roll extrusion to thin the strip steel, reducing the sticking of the rolls caused by relying solely on the roll extrusion. At the same time, by adjusting the displacement of the hydraulic cylinder IV, the shape of the S-shaped path can be changed online, flexibly adjusting the tension to adapt to the production of strip steel of different thicknesses, without stopping the machine to replace parts, thus improving production efficiency.

[0038] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0039] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0040] Figure 1 This is a three-dimensional structural schematic diagram of a finishing zone thickness control device for hot-rolled strip steel production according to the present invention;

[0041] Figure 2 This is a front view schematic diagram of a finishing zone thickness control device for hot-rolled strip steel production according to the present invention;

[0042] Figure 3 This is a schematic diagram of the installation structure of pressure roller I, pressure roller II and main drive roller of a thickness control device for the finishing zone in hot-rolled strip steel production according to the present invention;

[0043] Figure 4 This is a schematic diagram of the pressing actuator of a finishing zone thickness control device for hot-rolled strip steel production according to the present invention;

[0044] Figure 5 This is a schematic diagram of the cooperation structure between the upper and lower adjusting wedge blocks of a finishing zone thickness control device for hot-rolled strip steel production according to the present invention;

[0045] Figure 6 This is a schematic diagram of the drive cam and positioning rod structure of a finishing zone thickness control device for hot-rolled strip steel production according to the present invention;

[0046] Figure 7 This is a schematic diagram of the connection structure between the support bracket and the tension roller system of a thickness control device for the finishing zone in hot-rolled strip steel production according to the present invention.

[0047] Reference numerals: 1. Rolling mill stand; 11. Limit seat I; 12. Piston rod I; 13. Limit seat II; 14. Bearing seat I; 15. Piston rod II; 16. Bearing seat II; 17. Bearing seat III; 2. Lower lifting mechanism; 21. Mounting base; 22. Hydraulic cylinder I; 23. Lower wedge; 24. Upper wedge; 3. Lower pressing actuator; 31. Mounting frame; 32. Hydraulic cylinder II; 33. Lifting bracket; 34. Fixed base; 35. Lower adjusting wedge; 36. Adjusting base; 37. Disc spring assembly; 38. Adjusting screw; 39. 1. Connecting column I; 310. Adjusting through hole; 311. Upper adjusting wedge; 312. Positioning through hole; 313. Hydraulic cylinder III; 314. Rotary disk; 315. Drive cam; 316. Positioning rod; 317. Return spring; 4. Tension roller system; 41. Extension bracket; 42. Rotating support plate; 43. Guide roller; 44. Strip steel guide channel; 45. Connecting column II; 5. Connecting bracket; 6. Pressure roller I; 7. Pressure roller II; 8. Main drive roller; 9. Support bracket; 91. Swinging support plate; 92. Waist-shaped through hole; 10. Hydraulic cylinder IV. Detailed Implementation

[0048] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0049] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0050] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0051] Example 1

[0052] like Figures 1-7 As shown, a thickness control device for the finishing zone in hot-rolled strip steel production includes a mill stand 1, a lower lifting mechanism 2, a lower pressing actuator 3, and a matching roller system. It focuses on achieving stable adjustment of the roll gap and wear compensation, and suppressing the roll gap fluctuation problem caused by hydraulic drive.

[0053] The rolling mill stand 1, serving as the overall support structure, is integrally formed from high-strength cast steel. Precision slide rails and corresponding installation positions are pre-installed on the inner side, with the guide accuracy controlled within 0.005mm, providing a stable installation benchmark and offset-free guidance for all moving parts. A lower lifting mechanism 2 is installed at the bottom of the rolling mill stand 1 to drive the pressure roll II 7, main drive roll 8, and pressure roll I 6 to move upwards synchronously, achieving basic adjustment of the roll gap. Its driving force transmission path avoids roll gap offset caused by uneven local force distribution.

[0054] The mounting base 21 of the lower lifting mechanism 2 is fixed to the outer walls of both sides of the rolling mill stand 1 by high-strength bolts. The top of the mounting base 21 is rotatably connected to the hydraulic cylinder I 22 through a hinge seat. The hinge seat has a built-in self-lubricating bearing to ensure that the hydraulic cylinder I 22 can swing slightly around the hinge point to match the relative movement trajectory of the lower wedge 23 and the upper wedge 24. A horizontal guide groove is provided on the inner bottom of the rolling mill stand 1. A dust cover is provided at the opening of the guide groove. The lower wedge 23 is embedded in the guide groove and cooperates with the groove wall through a slider. The dust cover is used to prevent dust from entering the guide groove and can slide smoothly horizontally along the groove. The top of the lower wedge 23 is machined into an inclined surface with a surface roughness controlled below Ra0.8. The bottom inclined surface of the upper wedge 24 fits against the top inclined surface of the lower wedge 23, and the bottom of the upper wedge 24 is provided with anti-slip texture to prevent slippage during relative sliding. The piston rod end of hydraulic cylinder I22 is connected to the lower wedge 23 and the upper wedge 24 respectively through a double hinge structure. The double hinge adopts a ball joint design, which can adapt to the angle change. When the piston rod of hydraulic cylinder I22 extends or retracts, it drives the lower wedge 23 and the upper wedge 24 to slide horizontally relative to each other. With the help of the inclined plane, the horizontal thrust is converted into a vertical lifting force. The lifting efficiency is adapted according to the angle of the inclined plane, which can smoothly push the upper part to rise and avoid the impact of the roller system.

[0055] A limiting seat I11 is fixedly installed inside the mill stand 1. The limiting seat I11 adopts an integral forging structure, with precision guide holes machined at the top and bottom. The clearance between the guide holes and the piston rod I12 is controlled within 0.01-0.02mm. The piston rod I12 slides through the guide holes, and its surface is hard chrome plated to improve wear resistance and smooth sliding. The output ends of the two piston rods I12 at the same height are fixedly connected to the bearing seats I14 by bolts. The two ends of the pressure roll II7 are rotatably mounted between the two corresponding bearing seats I14 by deep groove ball bearings. The deep groove ball bearings can withstand radial force and slight axial force, allowing the pressure roll II7 to rise and fall synchronously with the bearing seats I14 and rotate freely, ensuring uniform linear velocity of the roll surface during rolling.

[0056] The upper and lower ends of the limiting seat I11 are fixed to the limiting seat II13 by welding. After welding, stress relief treatment is performed to prevent deformation from affecting the guiding accuracy. The limiting seat II13 is also machined with guide holes. The piston rod II15 slides through the guide holes. The output ends of the two piston rods II15 at the same height are fixed to the bearing seat II16. The two ends of the main drive roller 8 are installed between the bearing seats II16 through self-aligning roller bearings. The self-aligning roller bearings can compensate for installation deviations. One end of the main drive roller 8 is connected to the external geared motor through a flexible coupling. The flexible coupling can buffer the motor vibration and provide stable power for the rolling process. The bearing housing III17, used to install the lower pressure roller I6, is slidably mounted on the inner slide rail of the mill stand 1. The top of the upper wedge 24 is tightly fitted with the bottom of the lower bearing housing I14, bearing housing II16, and bearing housing III17 in sequence. The mating surfaces are ground to ensure that the lifting force is evenly transmitted to each bearing housing through the upper wedge 24, driving the pressure roller II7, the main drive roller 8, and the pressure roller I6 to rise and fall synchronously, ensuring that the roll gap is uniform in the width direction and avoiding local thickness deviations.

[0057] A downward pressing actuator 3 is installed on the upper part of the rolling mill stand 1. This actuator drives the upper pressure rolls I 6, II 7, and the main drive roll 8 to move downwards, cooperating with the lower roll system to complete the strip finishing rolling, forming a bidirectional roll gap adjustment structure. The mounting frame 31 of the downward pressing actuator 3 is bolted to the upper inner side of the rolling mill stand 1. The mounting frame 31 adopts a rectangular frame structure. The hydraulic cylinder II 32 is fixed at the top center position by a flange. A sealing gasket is added between the flange and the mounting frame 31 to prevent hydraulic oil leakage. The piston rod of the hydraulic cylinder II 32 extends vertically downwards, and its end is welded to the lifting bracket 33. The weld is beveled and inspected for flaws to ensure the connection strength.

[0058] The lifting bracket 33 is a steel plate structure with connecting columns I 39 welded to both sides of the bottom end. Vertical adjustment through holes 310 are machined on the side of the connecting bracket 5. The connecting column I 39 passes through the adjustment through holes 310. The height of the adjustment through holes 310 is 0.5-1mm greater than the diameter of the connecting column I 39, so that the connecting bracket 5 can have a slight floating space in the vertical direction relative to the lifting bracket 33, which can adapt to the slight impact during the rolling process and avoid component damage caused by rigid connection.

[0059] A wedge adjustment mechanism is installed between the top of the connecting bracket 5 and the bottom of the lifting bracket 33 to compensate for wear of the roller body after long-term use and achieve micron-level adjustment of the roller gap. The fixed base 34 of the wedge adjustment mechanism is fixed to the top of the connecting bracket 5 by bolts. A horizontal slide rail is machined on the top of the fixed base 34. The slide rail adopts a dovetail groove structure and has a telescopic dust cover on the outside of the slide rail. The lower adjusting wedge 35 is embedded in the slide rail and can slide along the slide rail. The two ends of the dust cover are fixed to the end of the fixed base 34 and the side of the lower adjusting wedge 35, respectively, to prevent it from falling off the rail when sliding. An adjusting wedge 311 is welded to the bottom of the lifting bracket 33. The inclined surface of the upper adjusting wedge 311 fits against the inclined surface of the lower adjusting wedge 35. The inclination angle of the inclined surface is controlled at 15-20°. This angle takes into account both adjustment accuracy and driving force, which is convenient for small displacement control and avoids excessive thrust that could cause component deformation.

[0060] A drive assembly is provided on the fixed base 34 to drive the lower adjusting wedge 35 to slide horizontally. The drive assembly includes an adjusting screw 38 and an adjusting base 36. The adjusting screw 38 rotates through the fixed base 34 via a sealed rolling bearing. A dustproof sealing cover is provided on the outside of the bearing. A bellows dustproof sleeve is fitted around the outer periphery of the adjusting screw 38. The two ends of the bellows dustproof sleeve are fixedly connected to the fixed base 34 and the adjusting base 36, respectively. To prevent dust from entering and affecting the rotation accuracy, the adjusting base 36 is threadedly fitted onto the adjusting screw 38. A limit pin is provided between the adjusting base 36 and the fixed base 34. The limit pin is embedded in the sliding groove of the fixed base 34 to prevent the adjusting base 36 from rotating with the adjusting screw 38. Two guide rods are fixed inside the fixed base 34 and pass through the adjusting base 36 to limit the movement of the adjusting base 36 to only the horizontal direction, ensuring that it moves only in the horizontal direction. A disc spring assembly 37 is installed between the adjusting base 36 and the lower adjusting wedge 35. The disc spring assembly 37 is composed of multiple stacked disc springs in a mating stacking manner. Both ends of the disc spring assembly 37 are in close contact with the adjusting base 36 and the lower adjusting wedge 35, respectively. The disc spring assembly 37 can provide stable preload force, absorb impact vibration during the rolling process, and control the vibration amplitude within the design tolerance range of the strip thickness, reducing the impact of roll system sway on thickness control. When the adjusting screw 38 is rotated, the adjusting base 36 is driven to move horizontally. The thrust is transmitted to the lower adjusting wedge 35 through the disc spring assembly 37, pushing the lower adjusting wedge 35 to slide horizontally. With the help of the inclined plane, the horizontal displacement is converted into vertical displacement, driving the lifting bracket 33 and the upper roll system to make micro-displacement adjustments in the vertical direction. The adjustment accuracy can reach 0.01mm, meeting the production requirements of ultra-thin strip steel.

[0061] A mechanical locking device is installed on the mounting frame 31 to lock the position of the lifting bracket 33 after it moves to the target position, suppressing roller gap fluctuations caused by the compressibility of hydraulic oil. The mechanical locking device includes a rotating disk 314, a drive cam 315, a hydraulic cylinder Ⅲ 313, and a positioning rod 316. The rotating disk 314 is rotatably mounted on the bottom wall of the mounting frame 31 via a thrust bearing. The thrust bearing can withstand axial force to ensure smooth rotation of the rotating disk 314. The drive cam 315 has an elliptical structure and is fixed to the top of the rotating disk 314 by bolts. The contour of the drive cam 315 is precision ground to ensure stable contact with the positioning rod 316.

[0062] Hydraulic cylinder III 313 is mounted on the bottom wall of mounting frame 31 via a hinged seat. Its piston rod end is eccentrically hinged to the top of rotating disk 314. The eccentricity is designed according to the stroke of drive cam 315. When the piston rod of hydraulic cylinder III 313 extends or retracts, it drives rotating disk 314 to rotate around its central axis, thus adjusting the angle of drive cam 315. Positioning rod 316 slides horizontally through both sides of mounting frame 31. The inner end of positioning rod 316 is machined into an arc surface, tightly abutting against the contour of drive cam 315 to reduce contact wear. A return spring 317 is fitted onto positioning rod 316. The two ends of return spring 317 abut against the inner wall of one side of mounting frame 31 and the boss of positioning rod 316, respectively, always providing an inward restoring force to positioning rod 316, ensuring that positioning rod 316 and drive cam 315 are tightly fitted in the unlocked state. When the lifting bracket 33 moves to the target position, the hydraulic cylinder III 313 drives the rotating disk 314 to rotate, and the protrusion of the driving cam 315 pushes the positioning rod 316 outward, so that the outer end of the positioning rod 316 is inserted into the positioning through hole 312 on the side of the lifting bracket 33, thereby realizing the relative locking between the lifting bracket 33 and the mounting frame 31, controlling the roll gap fluctuation range within ±0.005mm, and significantly improving the thickness control accuracy.

[0063] In this embodiment, during operation, the strip first enters the roll system area within the mill stand 1. The hydraulic cylinder I 22 of the lower lifting mechanism 2 actuates, driving the lower wedge 23 to slide relative to the upper wedge 24. Through the inclined plane, the lower pressure roller II 7, the main drive roller 8, and the pressure roller I 6 are lifted and adjusted to the preset basic roll gap position. Subsequently, the hydraulic cylinder II 32 of the lower pressing actuator 3 actuates, driving the lifting bracket 33 downwards, thus pressing down the upper roll system. During this process, the roll gap is finely adjusted by rotating the adjusting screw 38, using the wedge adjustment mechanism to compensate for errors caused by roller wear. Once the lifting bracket 33 reaches the target position, the hydraulic cylinder III 313 actuates, driving the rotating disk 314 to rotate. The positioning rod 316, under the action of the driving cam 315, inserts into the positioning through hole 312, locking the lifting bracket 33 and suppressing roll gap bounce caused by hydraulic oil compression. The main drive roller 8 rotates under the drive of the reduction motor, using friction to propel the strip forward and complete the rolling process.

[0064] Example 2

[0065] Reference Figures 1-7 Based on Example 1, this embodiment adds a tension roller system 4, a support bracket 9, and a matching drive structure. By combining tensioning and rolling, the thinning effect of ultra-thin strip steel is optimized, the sticking phenomenon of rollers is reduced, and the surface quality and production efficiency of strip steel are improved.

[0066] The tension roll system 4 is installed on the strip inlet and outlet sides of the rolling mill stand 1 to guide the strip and apply adjustable tension. Combined with the roll system extrusion in Embodiment 1, it achieves thinning through a combination of tensioning and rolling. Two sets of extension supports 41 of the tension roll system 4 are welded to the strip inlet and outlet sides of the rolling mill stand 1, respectively. The extension supports 41 are constructed of welded steel profiles and undergo aging treatment after welding to eliminate internal stress. The outer ends of the extension supports 41 are rotatably connected to the rotating support plate 42 via a horizontal rotating shaft. Bearings are fitted at both ends of the horizontal rotating shaft to ensure that the rotating support plate 42 can rotate freely around the shaft, with rotational resistance controlled within a small range.

[0067] Two sets of upper and lower guide rollers 43 are rotatably mounted between two rotating support plates 42 on the same side via bearings. The surfaces of the guide rollers 43 are chrome-plated and polished to improve wear resistance and surface smoothness, preventing scratches on the strip surface. A strip guide channel 44 is formed between the upper and lower sets of guide rollers 43. The width of the strip guide channel 44 can be adjusted according to the strip thickness. The initial planes of the rotating support plates 42 on the inlet and outlet sides face opposite directions, and the center lines of the strip guide channels 44 on both sides are on the same horizontal line, ensuring that the strip enters and exits the mill straight, avoiding deviation or scratches during conveying, and laying the foundation for subsequent tension application.

[0068] A support bracket 9 is erected between the two sets of rolling mill stands 1. The support bracket 9 is fixed to the ground with anchor bolts, which are cast into the concrete foundation to ensure overall stability and prevent swaying during tension adjustment. Two swing plates 91 are symmetrically mounted on the inner side of the support bracket 9 via pins. Copper sleeves are fitted between the pins and the swing plates 91 to reduce rotational wear. Both ends of the swing plates 91 are machined with oblong through holes 92. The length of the oblong through holes 92 is adapted to the rotation stroke of the rotating support plate 42, providing movement space for the connecting column II 45.

[0069] A connecting column II 45 is welded to the outer side of the rotating support plate 42. The end of the connecting column II 45 is machined with a rounded corner structure to avoid scratching the inner wall of the waist-shaped through hole 92. The connecting column II 45 extends into the waist-shaped through hole 92 at the end of the corresponding side swing support plate 91, and a clearance fit is used between the connecting column II 45 and the waist-shaped through hole 92. The clearance is controlled within 0.1-0.2mm, allowing the connecting column II 45 to slide smoothly along the length of the through hole. Hydraulic cylinders IV 10 are mounted on both sides of the support bracket 9 via hinge seats. The piston rod end of the hydraulic cylinder IV 10 is hinged to the corresponding connecting column II 45. The hinge uses a spherical bearing, which can adapt to multi-angle movement.

[0070] The device also includes a controller (not shown in the diagram). The controller can be a PLC or an industrial computer. The controller is electrically connected to hydraulic cylinders I22, II32, III313 and IV10 respectively through hydraulic servo valve groups. It is used to receive thickness setting signals and sensor feedback, and coordinate and control the action sequence, displacement and pressure of each hydraulic cylinder according to a preset program, thereby realizing the precise setting, locking and dynamic adjustment of the roll gap and tension.

[0071] When tension needs to be applied, the piston rod of hydraulic cylinder IV10 extends and retracts, driving the swing support plate 91 to swing around the pin shaft. The swing support plate 91, through the oblong through hole 92 and the connecting column II 45, drives the rotating support plates 42 on the inlet and outlet sides to rotate in opposite directions, causing the upper and lower sets of guide rollers 43 to form an S-shaped path. When the strip steel passes through the S-shaped path, the guide rollers 43 make a wrapping contact with the strip steel, applying stable tension. The tension can be adjusted online by adjusting the displacement of hydraulic cylinder IV10, with an adjustment range of 5-20MPa. It can be flexibly adapted to strip steel of different thicknesses and materials without stopping the machine to replace parts, thus improving production continuity.

[0072] By utilizing the stretching effect of tension in conjunction with the extrusion force of the rolls, strip thinning is achieved. The Poisson's ratio effect is employed to simultaneously elongate the strip in the stretching direction and thin it in the thickness direction, reducing the sticking phenomenon that can occur with relying solely on roll extrusion and lowering the surface defect rate of the strip. In this embodiment, based on the rolling process of Embodiment 1, the guide roller 43 is adjusted by hydraulic cylinder IV10 to form a corresponding S-shaped path according to the strip thickness specifications. Appropriate tension is applied, and the tension and roll extrusion force work synergistically to further improve thickness control accuracy while reducing equipment failure risks, making it suitable for production scenarios requiring extremely thin strips.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A thickness control device for the finishing zone in hot-rolled strip steel production, characterized in that, include: Rolling mill archway (1); The lower lifting mechanism (2) is installed at the lower part of the mill stand (1) and is used to drive the lower pressure roller II (7), main drive roller (8) and pressure roller I (6) to move upward; The downward pressing actuator (3) is installed on the upper part of the mill stand (1) and is used to drive the upper pressure roller I (6), pressure roller II (7) and main drive roller (8) to move downward so as to cooperate with the lower roller system to perform fine rolling on the strip. The pressing actuator (3) includes an installation frame (31) fixed inside the mill stand (1), a hydraulic cylinder II (32) installed on the top of the installation frame (31), and a lifting bracket (33) driven by the hydraulic cylinder II (32) and vertically arranged. The mounting frame (31) is provided with a mechanical locking device, and the lifting bracket (33) has a positioning through hole (312) on its side. When the lifting bracket (33) moves to the target position, the mechanical locking device can be inserted into the positioning through hole (312) to lock the lifting bracket (33) relative to the mounting frame (31), thereby suppressing the roller gap fluctuation caused by the compressibility of hydraulic oil.

2. The thickness control device for the finishing zone in hot-rolled strip steel production according to claim 1, characterized in that, The lower lifting mechanism (2) includes a mounting base (21) fixed on both sides of the mill stand (1), a hydraulic cylinder I (22) hinged to the top of the mounting base (21), a lower wedge (23) slidably disposed in the mill stand (1), and an upper wedge (24) slidably disposed on the top of the lower wedge (23). The piston rod end of the hydraulic cylinder I (22) is hinged to the corresponding lower wedge (23) and upper wedge (24), so that the hydraulic cylinder I (22) drives the lower wedge (23) and the upper wedge (24) to slide relative to each other, and then converts the horizontal thrust into the vertical lifting force through the inclined plane cooperation.

3. The thickness control device for the finishing zone in hot-rolled strip steel production according to claim 1, characterized in that, It also includes a tension roller system (4), which includes two sets of extension brackets (41) fixed to the strip entry side and exit side of the mill stand (1), rotating support plates (42) rotatably mounted on the outer ends of the two extension brackets (41) on the same side via rotating shafts, and two sets of upper and lower guide rollers (43) rotatably mounted between the two rotating support plates (42) on the same side, forming a strip guide channel (44) for the strip to pass through between the upper and lower sets of guide rollers (43).

4. The thickness control device for the finishing zone in hot-rolled strip steel production according to claim 1, characterized in that, The pressing actuator (3) also includes a connecting bracket (5), and a wedge adjustment mechanism is provided between the top of the connecting bracket (5) and the bottom of the lifting bracket (33); The wedge adjustment mechanism includes a fixed base (34) fixed to the top of the connecting bracket (5), a lower adjustment wedge (35) slidably disposed on the top of the fixed base (34), and an upper adjustment wedge (311) fixed to the bottom of the lifting bracket (33) and whose inclined surface cooperates with the lower adjustment wedge (35). The fixed base (34) is provided with a drive assembly that drives the lower adjusting wedge (35) to slide horizontally, thereby driving the lifting bracket (33) and the upper roller system connected thereto to make micro-displacement adjustments in the vertical direction through inclined surface cooperation, so as to compensate for roller wear.

5. The thickness control device for the finishing zone in hot-rolled strip steel production according to claim 4, characterized in that, The driving assembly includes an adjusting screw (38) that rotates through the fixed base (34) and an adjusting base (36) threaded onto the adjusting screw (38). A disc spring assembly (37) is provided between the adjusting base (36) and the lower adjusting wedge (35). Rotating the adjusting screw (38) can drive the adjusting base (36) to move, thereby pushing the lower adjusting wedge (35) to slide through the disc spring assembly (37).

6. The thickness control device for the finishing zone in hot-rolled strip production according to claim 3, characterized in that, It also includes a support bracket (9) set between the two sets of the rolling mill stands (1), and two swing plates (91) are symmetrically rotated on the inner side of the support bracket (9), and both ends of the swing plates (91) are provided with waist-shaped through holes (92). A connecting column II (45) is fixed on the outside of the rotating support plate (42), and the connecting column II (45) extends into the waist-shaped through hole (92) at the end of the swing support plate (91) on the corresponding side. Hydraulic cylinders IV (10) are hinged to both sides of the support bracket (9), and the piston rod end of the hydraulic cylinder IV (10) is hinged to the corresponding connecting column II (45). The hydraulic cylinder IV (10) can drive the swing support plate (91) to swing, and then through the cooperation of the waist-shaped through hole (92) and the connecting column II (45), drive the rotating support plate (42) on the inlet side and the outlet side to rotate in opposite directions, so that the guide roller (43) forms an S-shaped path to apply tension to the strip steel.

7. The thickness control device for the finishing zone in hot-rolled strip steel production according to claim 1, characterized in that, The mechanical locking device includes a rotating disk (314) rotatably mounted on the bottom wall of the mounting frame (31), a drive cam (315) fixed to the top of the rotating disk (314), a hydraulic cylinder III (313) hinged to the bottom wall of the mounting frame (31) for driving the rotating disk (314) to rotate, and a positioning rod (316) that slides horizontally through both sides of the mounting frame (31) and whose inner end abuts against the contour of the drive cam (315). A reset spring (317) is fitted on the positioning rod (316). When the hydraulic cylinder III (313) drives the rotating disk (314) to rotate, the protrusion of the driving cam (315) pushes the positioning rod (316) outward and inserts it into the positioning through hole (312).

8. The thickness control device for the finishing zone in hot-rolled strip steel production according to claim 2, characterized in that, The mill stand (1) is fixedly provided with a limiting seat I (11). The top and bottom of the limiting seat I (11) are slidably installed with piston rods I (12). The output ends of the two piston rods I (12) at the same height are connected to bearing seats I (14). The pressure roller II (7) is rotatably installed between the two corresponding bearing seats I (14). Limiting seat I (11) is also fixedly provided with limiting seat II (13) at both ends. A piston rod II (15) slides through the limiting seat II (13). The output ends of the two piston rods II (15) at the same height are fixed with bearing seats II (16). The main drive roller (8) is rotatably installed between the two corresponding bearing seats II (16). The top of the upper wedge (24) contacts the bottom of the lower bearing seat I (14), bearing seat II (16) and bearing seat III (17) for mounting the lower pressure roller I (6) in sequence to transmit the lifting force.

9. The finishing zone thickness control device for hot-rolled strip steel production according to any one of claims 1 to 8, characterized in that, The bottom of the lifting bracket (33) is fixed with connecting columns I (39) on both sides. The side of the connecting bracket (5) is provided with a vertical adjustment through hole (310) through which the connecting column I (39) passes, so that the connecting bracket (5) can have a small floating space in the vertical direction relative to the lifting bracket (33).

10. The thickness control device for the finishing zone in hot-rolled strip production according to claim 6, characterized in that, The initial planes of the rotating support plate (42) on the inlet side and the outlet side are oriented in opposite directions, and the strip steel guide channels (44) on both sides are on the same horizontal line.

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