Novel high-precision prestress rolling mill on steel rolling line and control method

Abstract

The invention discloses a high-precision novel pre-stress rolling mill on a steel rolling line and a control method, and belongs to the technical field of steel rolling lines, the high-precision novel pre-stress rolling mill comprises a roller system and a rack system, the roller system is arranged in the rack system, the rack system comprises supporting columns and pre-tightening blocks, and the two sides of each pre-tightening block are connected with the supporting columns; a connecting key is arranged at the connecting position of the pre-tightening block and the supporting column. The roller system comprises an upper roller, a lower roller, an upper bearing seat and a lower bearing seat, and the upper bearing seat and the lower bearing seat are connected through a pull rod system; a pressing device is arranged at the top of the pull rod system and can control the opening degree of the roller assembling system. According to the invention, the connecting key is arranged at the joint of the pre-tightening block and the supporting column and is penetrated and fixed by a plurality of bolts, the connecting key can be arranged along the horizontal direction or the vertical direction, the transverse and longitudinal shear loads are borne by the key, the axial load is borne by the bolts, and the positioning and bearing functions are divided; relative sliding shear stress concentration is reduced, and abrasion and loosening risks of connecting pieces are reduced.

Description

Technical Field

[0001] This invention relates to a novel high-precision prestressed rolling mill and its control method on a steel rolling line, belonging to the technical field of steel rolling lines. Background Technology

[0002] Rolling mills are required for continuous rolling processes on steel production lines. These mills are installed on the rolling line and are responsible for the pressure-forming of metal strips or plates. They must continuously withstand large roll pressures and alternating loads at high or normal temperatures, and work in conjunction with a transmission system and automatic control system to ensure output and product dimensional accuracy. During operation, the equipment must simultaneously meet the requirements of rigid support, roll gap stability, thermal displacement compensation, and convenient maintenance. Therefore, high demands are placed on frame rigidity, bearing positioning accuracy, prestress control, and online adjustment capabilities.

[0003] Existing rolling mills generally adopt a basic structure including a frame, tie rods, and bearing housings. The upper and lower bearing housings are pre-tensioned or pre-compressed by tie rods and nuts, tension bolts, or hydraulic locking devices to improve the overall rigidity of the frame and maintain the stability of the roll gap. Some solutions still rely on manual adjustment or mechanical measures of a single locking device in terms of positioning repeatability, force distribution, and online adjustment. Several shortcomings in existing technologies limit rolling accuracy and operational reliability: the tie rod and nut bear all axial and impact loads during rolling, resulting in rapid wear of the connecting parts, short fatigue life, and long downtime for replacement; the positioning method between the frame and bearing housing is mostly a single bolt or single-sided contact, which makes it difficult to simultaneously take into account lateral and longitudinal positioning and load-bearing division, and assembly errors and shear loads can easily cause clearance and off-center loading; existing preload or locking measures are mostly static locking, lacking the ability to adjust zero with in-position springs and apply pre-deflection as needed to compensate for thermal expansion online, resulting in bearing clearance drift and roll gap instability under high-temperature conditions; the combination of modular maintenance methods and online fine-tuning functions is insufficient, making it difficult to quickly restore high-precision positioning without damaging the frame reference when changing rolls or performing maintenance.

[0004] Therefore, there is an urgent need for a new type of high-precision prestressed rolling mill and control method on a steel rolling line to solve the above problems. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide a new type of high-precision prestressed rolling mill and control method on a steel rolling line. It solves the problems of rapid wear of connecting parts, short fatigue life, easy to cause gaps and off-center loads, existing preload or locking measures are mostly static locking, and it is difficult to quickly restore high-precision positioning without destroying the frame reference when changing rolls or performing maintenance.

[0006] The technical problem to be solved by this invention is achieved by the following technical solution: a new type of high-precision prestressed rolling mill on a steel rolling line, comprising... A rolling mill system and a frame system, wherein the rolling mill system is disposed within the frame system. The frame system includes a support column and a preload block. The preload block is provided on the top and bottom sides of the support column. Both sides of the preload block are connected to the support column. A connecting key is provided at the connection between the preload block and the support column. The support column and the preload block are connected by bolts. The rolling mill system includes an upper rolling mill, a lower rolling mill, and an upper bearing seat and a lower bearing seat for fixing the upper rolling mill and the lower rolling mill. The upper bearing seat and the lower bearing seat are connected by a tie rod system. The upper bearing seat and the lower bearing seat are symmetrically arranged on both sides of the upper rolling mill and the lower rolling mill, respectively. The top of the tie rod system is equipped with a pressing device, which can control the opening degree of the roll assembly system, and the tie rod system can control the gap between the upper bearing seat and the lower bearing seat.

[0007] Preferably, the connecting key is provided with a screw hole, and the bolt can pass through the connecting key to connect the support column and the preload block; the connecting key is arranged horizontally or vertically.

[0008] Preferably, the tie rod system includes four vertical tie rods, which pass through the preload block, the upper bearing seat, and the lower bearing seat from top to bottom; a support seat is provided between the upper bearing seat and the lower bearing seat, and the vertical tie rod passes through the support seat.

[0009] Preferably, each of the vertical tie rods is provided with a pressing device at its top. The pressing device includes two pressing boxes arranged side by side. The pressing boxes are arranged on adjacent vertical tie rods and are connected by a lead screw. They are driven synchronously by a hydraulic motor.

[0010] Preferably, an upper nut and a lower nut are respectively provided at the connection between the vertical tie rod and the upper bearing seat and the lower bearing seat, the threads of the upper nut and the lower nut are opposite in direction, and a spherical washer is provided at the connection.

[0011] Preferably, the upper bearing seat is connected to the preload block at the top via a hydraulic assembly, and the lower bearing seat is connected to the preload block at the bottom via a hydraulic assembly. The hydraulic assembly includes a hydraulic cylinder, which is disposed within the preload block and extends out of the preload block to connect with the corresponding upper bearing seat and lower bearing seat.

[0012] Preferably, a sliding groove is provided at the connection between the support column and the upper bearing seat and the lower bearing seat, and sliding plates are provided on both sides of the upper bearing seat and the lower bearing seat. The upper bearing seat and the lower bearing seat are connected to the sliding groove through the sliding plates provided on both sides, and the sliding plates and the sliding groove can slide at the connection.

[0013] Preferably, a cover plate is provided on the outer side of the chute.

[0014] Preferably, an axial adjustment device is provided on one side of the upper bearing seat. The axial adjustment device includes an adjustment frame, an adjustment rod, and a worm gear seat. The adjustment frame is disposed on the side of the support column. The adjustment rod is horizontally disposed, with one end connected to the adjustment frame and the other end connected to the worm gear seat. The worm gear seat is fixed to one side of the upper bearing seat. Controlling the adjustment rod can change the position of the upper bearing seat.

[0015] Preferably, four pre-tightening blocks are provided, and the pre-tightening blocks are connected in pairs and respectively located at the top and bottom of the support column. The support column is located at the four corners of the spliced ​​pre-tightening blocks. The spliced ​​pre-tightening blocks are provided with opening cylinders on both sides of the connection point. The opening cylinders can separate the spliced ​​pre-tightening blocks.

[0016] Preferably, tension bolts and tension sleeves are symmetrically arranged inside the spliced ​​pre-tightening blocks, and the spliced ​​pre-tightening blocks are fixed by the cooperation of the tension bolts and tension sleeves.

[0017] Preferably, the frame system has a base at the bottom, which supports the frame system, and guide beams are provided on both sides of the base, which can move the base.

[0018] Preferably, a cooling device is provided on the side of the frame system. The cooling device includes a piping beam and a cooling pipe. The two ends of the piping beam are connected to support columns and are located above the axial plane of the upper roll. The cooling pipe is located in the middle of the piping beam. The cooling pipe is also located on the side of the guide beam near the lower roll and below the axial plane of the lower roll.

[0019] Preferably, one side of the cooling pipe is curved, and multiple nozzles are provided at the bend. The other end of the cooling pipe can be connected to a water source, which can provide cooling water to the nozzles.

[0020] Preferably, the support column, the preload block, and the tie rod system are arranged in a symmetrical layout.

[0021] A novel high-precision control method for a prestressed rolling mill on a steel rolling line includes the following steps: S1. Connect the rack system; S2. Control the upper and lower nuts on the vertical tie rod to form a preset initial distance between the upper bearing seat and the lower bearing seat; during adjustment, set the spherical pad to ensure that the angular deviation at the connection between the vertical tie rod and the upper and lower bearing seats is automatically compensated, so that the tie rod axis and the bearing seat force surface are kept in a centered state. S3. Start the pressing device and drive the lead screw through the hydraulic motor to press down the adjacent vertical tie rods synchronously; S4. Control the hydraulic assembly to adjust the positions of the upper bearing seat and the lower bearing seat; S5. Control the axial adjustment device, rotate the adjustment rod, and the worm gear seat drives the upper bearing seat to move slightly along the axial direction to correct the axial position of the upper roll; S6. Maintain the stress state of the pressing device and the tie rod system, lock the current adjustment position, and keep the frame system in a stable prestress state during the rolling process.

[0022] Preferably, in S4, the upper bearing seat and the lower bearing seat slide within the corresponding grooves via the sliding plates on both sides, ensuring stable guidance of the bearing seat.

[0023] The beneficial effects of this invention are: By means of this invention, a connecting key is set at the connection between the preload block and the support column and a number of bolts are used to fasten it. The connecting key can be arranged in the horizontal or vertical direction. The transverse and longitudinal shear loads are borne by the key and the axial loads are borne by the bolts, realizing the division of positioning and bearing functions. It significantly reduces the relative slippage and shear stress concentration at the connection, and reduces the risk of wear and loosening of the connecting parts.

[0024] This invention uses four symmetrically arranged vertical tie rods to connect the upper bearing seat, the lower bearing seat, and the preload block into a prestressed whole. The top of the tie rod is equipped with a pressing device and can be pressed down synchronously by a screw and a hydraulic motor. Controlled preload connects the various components of the frame, eliminating gaps between the tie rods and nuts. The operating load is distributed from a single nut or bolt to the overall frame, reducing local impact loads and wear, and improving the rigidity of the frame and the dynamic stability of the roll gap.

[0025] This invention designs pretensioning blocks to be spliced ​​in pairs, with a top-opening cylinder at the splice point. A tensioning bolt and tensioning sleeve penetrate the splice. When maintenance or roll replacement is required, activating the top-opening cylinder separates the spliced ​​pretensioning blocks. After maintenance, the tensioning bolts quickly reset and restore positioning, significantly shortening maintenance downtime and ensuring repeatability of positioning accuracy after maintenance. Pretensioning blocks are installed on both sides and the top and bottom of the frame system, and the splices are tightened through the tensioning bolts and tensioning sleeves, improving the local rigidity of the frame and forming a closed force circuit. This eliminates gaps at the splices, ensuring repeatability of positioning accuracy between the pretensioning blocks and support columns, thereby reducing roll gap drift caused by deformation or loosening of the joint surface and shortening the time for restoring accuracy after maintenance.

[0026] This invention employs a reverse-threaded upper and lower nut with a spherical washer at the vertical tie rod connection. The reverse thread enables single-point operation, generating relative displacement for precise fine-tuning of the upper and lower bearing seat spacing. The spherical washer compensates for angular errors, ensuring uniform force distribution and facilitating high-resolution static gap adjustment and long-term mechanical stability. Hydraulic components, such as hydraulic steel cylinders, are arranged within the preload block or at its connection to the bearing seat. The piston end extends and connects to the bearing seat, independently applying a small thrust. This achieves the following: online micro-displacement adjustment of the upper / lower bearing seats under preload, enabling precise closed-loop correction of the roll gap. This structure allows for compensation of minor deviations caused by thermal displacement or load during operation, improving rolling accuracy and maintaining long-term stability. The design incorporates a sliding groove and a sliding plate with a cover plate on the outside of the groove. Lubrication / wear-resistant measures are provided at the groove, allowing controlled micro-sliding of the bearing seat in a predetermined direction to release displacement caused by thermal expansion or pre-deflection, preventing jamming or misalignment, and ensuring guiding reliability and repeatability.

[0027] This invention employs two parallel pressing chambers linked by a lead screw and driven by a hydraulic motor to achieve synchronous pressing. This ensures synchronized and symmetrical force distribution on the entire tie rod system, avoiding uneven loading and resulting in eccentric loads or torque. It also improves overall rigidity and force balance, thereby reducing roll gap fluctuations and enhancing product thickness consistency. The frame layout is symmetrical: support columns, preload blocks, and tie rods are arranged in pairs, ensuring symmetrical force paths and uniform deformation distribution. This reduces unilateral deformation or warping, facilitating high-precision maintenance. It also simplifies manufacturing, assembly, and on-site replacement, improving on-site maintenance efficiency and repeatability. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention.

[0029] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0030] Figure 3 This is a side view diagram of the present invention. Figure 4 This is a schematic diagram of the installation of the axial adjustment device of the present invention.

[0031] Figure 5 This is a schematic diagram of the rack system of the present invention.

[0032] Figure 6 This is a schematic diagram showing the connection between the upper bearing housing and the lower bearing housing on one side of the present invention.

[0033] Figure 7 This is a schematic diagram of the installation of the cooling device of the present invention.

[0034] In the diagram: 1-Roll system, 11-Upper roll, 12-Lower roll, 13-Upper bearing housing, 14-Lower bearing housing, 15-Tie rod system, 151-Vertical tie rod, 152-Upper nut, 153-Lower nut, 154-Spherical pad, 16-Pressure device, 161-Pressure housing, 162-Screw, 163-Hydraulic motor, 17-Support base, 2-Frame system, 21-Support column, 211-Slide groove, 212-Slide plate, 22-Preload block, 221-Push-opening cylinder, 222-Tightening bolt, 223-Tightening sleeve, 23-Connecting key, 24-Bolt, 3-Hydraulic assembly, 31-Hydraulic steel cylinder, 4-Axial adjustment device, 41-Adjusting frame, 42-Adjusting rod, 43-Worm gear seat, 5-Frame. 51-Guide beam, 6-Cooling device, 61-Pipe beam, 62-Cooling pipe. Detailed Implementation

[0035] To facilitate a clear understanding of the technical means, creative features, objectives, and effects of this invention, the invention will be further described below in conjunction with specific embodiments. Example 1

[0036] like Figures 1-7 As shown, a new type of high-precision prestressed rolling mill on a steel rolling line includes a roll system 1 and a frame system 2, with the roll system 1 housed within the frame system 2.

[0037] The frame system 2 includes a support column 21 and a pre-tightening block 22. The support column 21 is provided with a pre-tightening block at the top and bottom of its side. The two sides of the pre-tightening block 22 are connected to the support column 21. A connecting key 23 is provided at the connection between the pre-tightening block 22 and the support column 21. The support column 21 and the pre-tightening block 22 are connected by bolts 24.

[0038] The rolling mill system 1 includes an upper rolling mill 11 and a lower rolling mill 12. Upper bearing seats 13 are provided on both sides of the upper rolling mill 11, and lower bearing seats 14 are provided on both sides of the lower rolling mill 12. The upper bearing seats 13 and the lower bearing seats 14 are connected by a tie rod system 15. The upper bearing seats 13 and the lower bearing seats 14 are symmetrically provided on both sides of the upper rolling mill 11 and the lower rolling mill 12, respectively.

[0039] A pressing device 16 is provided at the top of the tie rod system 15. The pressing device 16 can control the opening degree of the roll assembly system, specifically the tie rod system 15. The tie rod system 15 can control the gap between the upper bearing seat 13 and the lower bearing seat 14.

[0040] Reference Figure 1-5 The frame system 2 includes support column 21, preload block 22, connecting key 23, and bolt 24.

[0041] The support columns 21 are multiple vertically arranged components. In this embodiment, four support columns 21 are provided. The support columns 21 have planar mounting surfaces corresponding to the pre-tightening blocks 22 at the top and bottom. Sliding grooves 211 are provided on the side of the support columns 21. The structure of the sliding grooves 211 is as follows: Figure 5 As shown. The slide 211 can hold the slide plate 212 in place.

[0042] In this embodiment, four pre-tightening blocks 22 are provided, and the pre-tightening blocks 22 are spliced ​​in pairs. Two spliced ​​pre-tightening blocks 22 are located at the bottom, and two spliced ​​pre-tightening blocks 22 are located at the top. The four corners of the spliced ​​pre-tightening blocks 22 are provided with end faces that cooperate with the support columns 21. The cross-section is provided with screw holes that cooperate with the support columns 21, and key holes that cooperate with the connecting key 23 are reserved. The bolts 24 can cooperate with the reserved screw holes.

[0043] Reference Figure 5 The pre-tightening block 22 has symmetrical through holes inside, and the tensioning bolt 222 and tensioning sleeve 223 can be installed in the through holes. The tensioning bolt 222 and tensioning sleeve 223 can cooperate to fix the spliced ​​pre-tightening block 22.

[0044] The four corners of the two spliced ​​pre-tightening blocks 22 at the bottom are connected to the bottom of the support column 21 by bolts 24; the four corners of the two spliced ​​pre-tightening blocks 22 at the top are connected to the top of the support column 21 by bolts 24. In this embodiment, multiple bolts 24 are provided, and grooves for connecting keys 23 are provided horizontally and vertically at the connection points. Two connecting keys 23 are provided in the contact surface between a pre-tightening block 22 and a support column 21, respectively, and are fixed by horizontal and vertical arrangement. The connecting keys 23 are also provided with through bolt holes, and some bolts 24 can pass through the pre-tightening block 22, connecting key 23, and support column 21 in sequence for fixation, while others pass through the pre-tightening block 22 and support column 21 in sequence for fixation. In this embodiment, the body of the connecting key 23 can withstand lateral shear force and is tightened by bolts 24 to ensure that there is no gap between the key and the groove.

[0045] Reference Figure 1 , 34 and 5, a lifting cylinder 221 is installed at the connection point of the two spliced ​​pre-tightening blocks 22. The lifting cylinder 221 is fixed to the splicing point of the spliced ​​pre-tightening blocks 22 by bolts. The lifting cylinder 221 can lift the two spliced ​​pre-tightening blocks 22 apart. When maintenance or replacement is required, activating the lifting cylinder 221 can separate the spliced ​​pre-tightening blocks 22. The pre-tightening blocks 22 are equipped with tension bolts 222 and tension sleeves 223 along the through direction inside. The tension bolts 222 and tension sleeves 221 can fix the spliced ​​blocks so that they can be retightened after the lifting cylinder 221 is activated. The lifting cylinder 221, tension bolts 222, and tension sleeves 223 work together to ensure positioning accuracy.

[0046] The rolling mill system 1 includes an upper rolling mill 11 and a lower rolling mill 12. The bodies of the upper rolling mill 11 and the lower rolling mill 12 are roller shafts, which are installed in corresponding upper bearing seats 13 and lower bearing seats 14. The ends of the upper rolling mill 11 and the lower rolling mill 12 are assembled by bearings and fixed by bolts. The upper bearing seats 13 and the lower bearing seats 14 are symmetrically arranged on both sides of the upper rolling mill 11 and the lower rolling mill 12 to ensure that the forces at both ends of the rolling mill are symmetrical.

[0047] A box structure is adopted between the upper bearing seat 13 and the lower bearing seat 14. Holes for fixing the upper roller 11 and the lower roller 12 are respectively provided in the middle of the upper bearing seat 13 and the lower bearing seat 14, allowing the upper roller 11 and the lower roller 12 to rotate within their respective bearing seats 13 and 14. Slide plates 212 are provided on the outer edges of the sides of the upper bearing seat 13 and the lower bearing seat 14, and these slide plates 212 can mate with the side grooves 211 of the support column 21. Support seats 17 are provided on both sides of the upper bearing seat 13 and the lower bearing seat 14, and the sides of the support seats 17 can mate with and be fixed to the support column 21. In this embodiment, screw holes are provided at the connection points between the support column 21 and the support seat 17, and keys are also provided at the mating points between the support seat 17 and the support column 21 for fixation.

[0048] Reference Figure 6 The upper bearing seat 13 and the lower bearing seat 14 are provided with holes on both sides to accommodate the vertical tie rod 151. In this embodiment, the vertical tie rod 151 can pass through from the top of the upper bearing seat 13 to the bottom and through the support seat 17, and is located inside the lower bearing seat 14.

[0049] In this embodiment, the sliding plates 212 on both sides of the upper bearing seat 13 and the lower bearing seat 14 have the same structure, and the sliding plates 212 can cooperate with the guide surface of the sliding groove 211 on the support column 21. The sliding plates 212 and the sliding groove 211 are allowed to slide relative to each other at the connection point. A cover plate is provided on the outside of the sliding groove 211, which can prevent foreign objects from entering and ensure the cleanliness of the guide surface.

[0050] The support base 17 is a rectangular block with a hole in the vertical direction to accommodate the vertical tie rod 151. Wear-resistant bushings are provided between the support base 17 and the upper bearing seat 13 and the lower bearing seat 14.

[0051] The upper bearing housing 13 and the lower bearing housing 14 are connected by a tie rod system 15. In this embodiment, the tie rod system 15 includes vertical tie rods 151. Four vertical tie rods 151 are provided, respectively located at the four corners. The vertical tie rods 151 pass through the top preload block 22, the upper bearing housing 13, and the support seat 17 in sequence from top to bottom. The bottom of the vertical tie rods 151 is fixed inside the lower bearing housing 14. The vertical tie rods 151 can connect the above components into a prestressed whole.

[0052] In this embodiment, a spherical pad 154 is provided inside the upper bearing housing 13. An upper nut 152 is located at the bottom of the spherical pad 154, and an oil reservoir is located at the bottom of the upper nut 152. The bottom of the oil reservoir is connected to a wear-resistant sleeve, and the oil reservoir extends out of the upper bearing housing 13. A spherical pad 154 is also provided inside the lower bearing housing 14. An oil reservoir is located at the top of the lower nut 153, and extends out of the lower bearing housing 14. The oil reservoirs at the bottom of the upper nut 152 and at the top of the lower nut 153 are respectively connected to and disconnected from the top and bottom of the support base 17. In this embodiment, a spacer is also provided inside the support base 17. The threads of the upper nut 152 and the lower nut 153 have opposite directions of rotation. Rotating the upper nut 152 and lower nut 153 allows them to tighten or loosen against each other, thus enabling precise adjustment of the distance between the vertical tie rod 151 and the upper bearing seat 13 and lower bearing seat 14. The reverse thread structure allows for relative displacement through a single operation, enabling fine-tuning of the clearance. A spherical pad 154 is provided at the connection point, compensating for angular deviations between the vertical tie rod 151 and the upper and lower bearing seats 13 and 14 through spherical contact, preventing stress concentration and ensuring uniform load distribution.

[0053] A pressing device 16 is provided at the top of each set of vertical tie rods 151. The pressing device 16 includes two pressing boxes 161 arranged side by side, a lead screw 162 connecting the two pressing boxes 161, and a hydraulic motor 163 driving the lead screw 162. In this embodiment, the specific structure is as follows: the two pressing boxes 161 are respectively placed on the top of adjacent vertical tie rods 151, and a lead screw bearing seat is provided inside the pressing box 161, through which the lead screw can pass; the two ends of the lead screw are respectively fixed to the pressing box 161, and the middle or one end of the lead screw is driven by the hydraulic motor 163, so that the two pressing boxes 161 can perform linked and synchronous pressing actions. The hydraulic motor 163 drives the lead screw 162 to rotate. The lead screw 162 and the pressing housing 161 are connected by a nut to achieve lifting and lowering, thereby converting the rotational motion into vertical displacement, and thus applying axial preload or release force to the vertical tie rod 151. The pressing housing 161 is a near-rectangular shell with internal guide and reinforcing ribs to withstand the clamping force.

[0054] The hydraulic motor 163 drives the lead screw 162 to control the synchronous pressing of the two pressing boxes 161, enabling adjacent vertical tie rods 151 to be preloaded simultaneously in a controlled direction, eliminating gaps at the connection. This achieves zeroing functionality. Furthermore, pre-deflection can be applied when needed to compensate for structural thermal deformation and correct the roll gap curve. The lead screw 162, pressing box 161, and the top of the vertical tie rod 151 of the pressing device 16 are connected by a locking mechanism to ensure reliable load transmission.

[0055] In frame system 2, the top-assembled preload block 22 has hydraulic components 3 at both ends connected to the upper bearing seat 13; the bottom-assembled preload block 22 also has hydraulic components 3 at both ends connected to the lower bearing seat 14. A hole for fixing the hydraulic component 3 is provided at one end of each preload block 22. The hydraulic component 3 includes a hydraulic cylinder 31, which can be installed inside the preload block 22. The piston rod end of the hydraulic cylinder 31 extends out of the preload block and connects to the corresponding upper bearing seat 13 or lower bearing seat 14. The cylinder body of the hydraulic cylinder 31 is fixed inside the preload block 22, and the piston rod end is connected to the upper bearing seat 13 or lower bearing seat 14 through a flat support, allowing the hydraulic cylinder 31 to apply a fine force to the upper bearing seat 13 or lower bearing seat 14. A seal and guide sleeve are provided between the cylinder body and the piston of the hydraulic cylinder 31, and an oil port is provided outside the cylinder body of the hydraulic cylinder 31 to connect to an external oil circuit. In this embodiment, the preload block 2 is provided with an oil passage that connects to an oil passage at the bottom of the hydraulic cylinder 31. The oil passage at the bottom of the hydraulic cylinder 31 extends upward and connects to the side wall of the hydraulic cylinder 31. The hydraulic cylinder 31 can finely adjust the position of the connected upper bearing seat 13 or lower bearing seat 14.

[0056] An axial adjustment device 4 is provided on one side of the upper bearing housing 13. The axial adjustment device 4 includes an adjustment frame 41 fixed to the side of the support column 21, a horizontally arranged adjustment rod 42, and a worm gear seat 43 fixed to the end of the adjustment rod 42. The adjustment rod 42 is in the shape of a round shaft, arranged horizontally, with one end connected to the adjustment frame 41 and the other end connected to the worm gear seat 43 by a thread. The worm gear seat 43 is fixed on one side of the upper bearing housing 13. When the adjustment rod 42 is driven to rotate, the worm gear seat 43 can generate creep on the support surface, causing the upper bearing housing 14 to move slightly axially, thereby achieving fine correction of the axial position of the rolls 11 and 12. In this embodiment, the axial adjustment device 4 can perform axial correction under the condition of being greased and preloaded.

[0057] In this embodiment, the frame system 2 is mounted on the base 5, and the base 5 is located at the bottom of the frame system 2. The base 5 supports the frame system 2, and guide beams 51 are provided on both sides of the base 5, allowing the base 5 to move. In this embodiment, the base 5 is a base component with an overall rectangular frame shape. A groove for accommodating the support column 21 is provided at the bottom of the base 5, and the bottom of the support column 21 can be placed within the groove at the bottom of the base 5. In this embodiment, support fixing plates are also provided at the four corners of the base 5. A swivel bolt is provided on the top of the support fixing plate, and a connecting seat is provided on the top of the swivel bolt. The connecting seat is bolted to the outer surface of the support column 21, and a key is provided at the connection point for fixation. The base 5 has high rigidity and bears the weight of the entire machine and transmits force to the foundation.

[0058] Guide beams 51 are provided on both sides of the base 5. The guide beams 51 are located on both sides of the base 5. The guide beams 51 can control the movement of the base 5. The guide beams 51 can be equipped with guide or clamping structures to assist in guidance.

[0059] In this embodiment, a cooling device 6 is also provided on the side of the frame system 2. The cooling device 6 includes a piping beam 61 and cooling pipes 62. In this embodiment, the piping beam 61 is connected to both sides of the support column 21 and is located above the axial plane of the upper roll 11. The cooling pipes 62 are located in the middle of the piping beam 61 and are arranged along the required arc, which is consistent with the arc of the upper roll 11. A cooling device is also provided on one side of the lower roll 12. The cooling pipes 62 are arranged on the side of the guide beam 51 near the lower roll to provide local cooling below the axial plane of the lower roll. One side of the cooling pipe 62 is arc-shaped, and multiple nozzles are installed at the arc bend. The other end of the cooling pipe can be connected to a water source. The cooling pipes 62 can provide local cooling for the upper roll 11 or the lower roll 12. The cooling device 6 can control the local temperature of the mill and reduce the impact of thermal expansion on accuracy.

[0060] A control method for a novel high-precision prestressed rolling mill on a steel rolling line, used to control a novel high-precision prestressed rolling mill on a steel rolling line.

[0061] S1, Connecting rack system 2.

[0062] The machine base 5 is fixed on the foundation, the reference surface is calibrated and the level is adjusted; the support column 21 is installed in the machine base 5 according to the design position and tightened with bolts.

[0063] Multiple preload blocks 22 are respectively assembled onto the top and bottom sides of the support column 21. The preload blocks 22 are paired and spliced ​​together, and connected and fixed by tension bolts 222 and tension sleeves 223. A connecting key 23 is inserted at the connection between the preload block 22 and the support column 21, and bolts 24 are used to pass through the connecting key 23 and fix it to the preload block 22, ensuring that there is no gap between the key and the groove. When replacing parts later, the spliced ​​preload blocks 22 are separated by activating the opening cylinder 221 located between two preload blocks 22.

[0064] S2. Control the upper nut 152 and lower nut 153 on the vertical tie rod 151 to form a preset initial gap between the upper bearing seat 13 and the lower bearing seat 14; during adjustment, set the spherical pad 154 to ensure that the angular deviation at the connection between the vertical tie rod 151 and the upper bearing seat 13 and the lower bearing seat 14 is automatically compensated, and to ensure that the axis of the vertical tie rod 151 is aligned with the force-bearing surface of the upper bearing seat 13 and the lower bearing seat 14.

[0065] Install the upper bearing housing 13 and the lower bearing housing 14 into the predetermined positions, install the support seat 17 and make the vertical tie rod 151 pass through the pre-tightening block 22, the upper bearing housing 13, the support seat 17 and the lower bearing housing 14 from top to bottom, with the bottom end of the vertical tie rod 151 set in the lower bearing housing 14.

[0066] S3 controls the position of the hydraulic assembly 3 relative to the upper bearing housing 13 and the lower bearing housing 14.

[0067] Force is applied to the upper bearing housing 13 and the lower bearing housing 14 by the hydraulic steel cylinder 31; the oil pressure inside the hydraulic steel cylinder is regulated by the hydraulic system control valve.

[0068] Under preload conditions, the gap between the upper bearing housing 13 and the lower bearing housing 14 is precisely controlled by opening and closing hydraulic valves and adjusting the position of the piston by a small amount, so as to prevent jumping between the upper roll 11 and the lower roll 12.

[0069] S4. Start pressing device 16 and press down synchronously; Install and connect the pressing device 16, specifically by placing the parallel pressing housings 161 on top of adjacent vertical tie rods 151, inserting the lead screw 162, and installing the hydraulic motor 163. Ensure that the locking mechanism connecting the pressing housings 161 to the top of the vertical tie rods 151 via the lead screw 162 is reliable.

[0070] The hydraulic motor 163 is started, driving the lead screw 162 to press down the pressing box 161 synchronously, applying a certain initial preload to the vertical tie rod 151. The pressing process adopts a stepped loading method: the load is increased step by step, and at each step, the connection is checked for abnormal deformation or loosening, so as to achieve spring zeroing and clearance elimination.

[0071] S5. Control the axial adjustment device 4, rotate the adjustment rod 42, and drive the upper bearing seat 13 to move slightly along the axial direction via the worm gear seat 43, correct the axial position of the upper roll 11 to ensure that the axis of the upper roll 11 is consistent with the direction of the workpiece.

[0072] After the axial adjustment is completed, the effect of the axial adjustment on the clearance or force can be checked again by pressing device 16, and a verification fine adjustment can be made if necessary.

[0073] S6. Keep the pressing device 16 and the tie rod system 15 in the set preload state. The current adjustment position is mechanically locked by the mechanical locking of the upper nut 152 and the lower nut 153 and the fixing of the tension bolt 222, so as to ensure that the stable prestress and gap state is maintained during oil cut-off or long-term operation.

[0074] In this embodiment, the two sets of pressing boxes 161 set at the top of the vertical pull rod 151 are linked by the lead screw 162 to press down synchronously.

[0075] When implementing the above steps, engineering rules such as symmetrical loading and diagonal sequential tightening should be followed to avoid eccentric loading. In steps S4 and S5, the slide groove 211 and slide plate 212 allow controlled sliding of the bearing housing to ensure guidance and micro-displacement compensation.

[0076] In step S3, a hydraulic assembly 3 is provided in each preload block 22. After the hydraulic assembly 3 is activated, the hydraulic cylinder 31 applies a maintaining pressure to the corresponding upper bearing seat 13 and lower bearing seat 14. In this embodiment, the maintaining pressure applied by the hydraulic cylinder 31 is 4 MPa. After step S4, the roll gap between the upper roll 11 and the lower roll 12 is adjusted to the set gap, and the pressure applied by the hydraulic cylinder 31 is increased to 14 MPa-16 MPa to prevent jumping between the upper roll 11 and the lower roll 12 during the rolling process.

[0077] In this embodiment, the support column 21, the preload block 22, and the tie rod system 15 are arranged in a symmetrical layout.

[0078] In this embodiment, the preload block 22 in the frame system 2 is equipped with a combination of connecting key 23 and bolt 24 to achieve rigid positioning and load-bearing division in the horizontal and vertical directions: the connecting key 23 bears the shear positioning load, and the bolt 24 bears the axial preload, thereby improving the assembly positioning accuracy and reducing local wear at the unit connection.

[0079] The connection between the vertical tie rod 151, the upper bearing seat 13, and the lower bearing seat 14 is achieved through the cooperation of the upper nut 152, the lower nut 153 and the spherical pad 154 to achieve fine adjustment and angle compensation, so that the initial positioning accuracy of the distance between the upper and lower bearing seats is controllable and can be calibrated by the pressing device 16 before operation.

[0080] The pressing device 16, as an online controllable preload actuator, can achieve spring zeroing and apply pre-deflection through stepped loading during assembly or operation, thereby maintaining the stability of the roll gap during rolling, reducing the impact load on tie rods and connecting parts, and improving processing accuracy and component life.

[0081] The pre-tightening block 22 can be equipped with a top-opening cylinder 221 at the splicing point, and the spliced ​​pre-tightening blocks 22 can be connected by tension bolts 222, so that the roller changing and maintenance operations can be completed quickly while maintaining the frame 5 reference as much as possible, reducing maintenance time and maintaining repeatability positioning accuracy.

[0082] The sliding groove 211, sliding plate 212 and axial adjustment device 4 work together to ensure that the bearing seat can be guided and will not get stuck when thermal expansion or slight displacement occurs, which is beneficial to temperature change compensation and long-term accuracy maintenance.

[0083] The cooling device 6 is equipped with a piping beam 61, a cooling pipe 62 and a nozzle, which can be used to control the local temperature field and reduce the thermal deformation range, thereby further ensuring the roll gap and rolling accuracy within the controllable range of temperature influence.

[0084] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of the invention, all of which fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel high-precision prestressed rolling mill for steel rolling lines, comprising: A rolling mill system and a frame system, wherein the rolling mill system is disposed within the frame system. Its features are: The frame system includes a support column and a preload block. The preload block is provided on the top and bottom sides of the support column. Both sides of the preload block are connected to the support column. A connecting key is provided at the connection between the preload block and the support column. The support column and the preload block are connected by bolts. The rolling mill system includes an upper rolling mill, a lower rolling mill, and an upper bearing seat and a lower bearing seat for fixing the upper rolling mill and the lower rolling mill. The upper bearing seat and the lower bearing seat are connected by a tie rod system. The upper bearing seat and the lower bearing seat are symmetrically arranged on both sides of the upper rolling mill and the lower rolling mill, respectively. The top of the tie rod system is equipped with a pressing device, which can control the opening degree of the roll assembly system, and the tie rod system can control the gap between the upper bearing seat and the lower bearing seat.

2. The novel high-precision prestressed rolling mill on a steel rolling line according to claim 1, characterized in that: The connecting key is provided with a screw hole, and the bolt can pass through the connecting key to connect the support column and the preload block; the connecting key is set horizontally or vertically.

3. A novel high-precision prestressed rolling mill for steel rolling lines according to claim 1, characterized in that: The tie rod system includes four vertical tie rods, which pass through the preload block, the upper bearing seat, and the lower bearing seat from top to bottom; a support seat is provided between the upper bearing seat and the lower bearing seat, and the vertical tie rod passes through the support seat.

4. A novel high-precision prestressed rolling mill for steel rolling lines according to claim 3, characterized in that: Each vertical tie rod is equipped with a pressing device at its top. The pressing device includes two pressing boxes arranged side by side. The pressing boxes are installed on adjacent vertical tie rods and are connected by a lead screw. They are driven synchronously by a hydraulic motor.

5. A novel high-precision prestressed rolling mill for steel rolling lines according to claim 3, characterized in that: The vertical tie rod is connected to the upper bearing seat and the lower bearing seat respectively with an upper nut and a lower nut. The threads of the upper nut and the lower nut are opposite in direction, and a spherical washer is provided at the connection.

6. A novel high-precision prestressed rolling mill for steel rolling lines according to claim 1, characterized in that: The upper bearing housing is connected to the preload block located at the top via a hydraulic assembly, and the lower bearing housing is connected to the preload block located at the bottom via a hydraulic assembly. The hydraulic assembly includes a hydraulic steel cylinder, which is disposed within the preload block and extends out of the preload block at its end, connecting to the corresponding upper and lower bearing housings.

7. A novel high-precision prestressed rolling mill for steel rolling lines according to claim 1, characterized in that: A sliding groove is provided at the connection between the support column and the upper bearing seat and the lower bearing seat. Slide plates are provided on both sides of the upper bearing seat and the lower bearing seat. The upper bearing seat and the lower bearing seat are connected to the sliding groove through the slide plates provided on both sides. The slide plates and the sliding groove can slide at the connection.

8. A novel high-precision prestressed rolling mill for steel rolling lines according to claim 7, characterized in that: A cover plate is provided on the outside of the chute.

9. A novel high-precision prestressed rolling mill for steel rolling lines according to claim 1, characterized in that: An axial adjustment device is provided on one side of the upper bearing seat. The axial adjustment device includes an adjustment frame, an adjustment rod, and a worm gear seat. The adjustment frame is located on the side of the support column. The adjustment rod is horizontally arranged, with one end connected to the adjustment frame and the other end connected to the worm gear seat. The worm gear seat is fixed to one side of the upper bearing seat. Controlling the adjustment rod can change the position of the upper bearing seat.

10. A novel high-precision prestressed rolling mill for steel rolling lines according to claim 1, characterized in that: Four pre-tightening blocks are provided, and the pre-tightening blocks are connected in pairs and respectively set at the top and bottom of the support column. The support column is located at the four corners of the spliced ​​pre-tightening blocks. The spliced ​​pre-tightening blocks are provided with opening cylinders on both sides of the connection point. The opening cylinders can separate the spliced ​​pre-tightening blocks.

11. A novel high-precision prestressed rolling mill on a steel rolling line according to claim 10, characterized in that: The pre-tightening blocks are symmetrically perforated with tension bolts and tension sleeves inside, and the pre-tightening blocks are fixed by the tension bolts and tension sleeves.

12. A novel high-precision prestressed rolling mill for steel rolling lines according to claim 1, characterized in that: The frame system is provided with a base at the bottom, which can support the frame system. Guide beams are provided on both sides of the base, and the guide beams can move the base.

13. A novel high-precision prestressed rolling mill on a steel rolling line according to claim 12, characterized in that: A cooling device is provided on the side of the frame system. The cooling device includes a piping beam and a cooling pipe. The two ends of the piping beam are connected to support columns and are located above the axial plane of the upper roll. The cooling pipe is located in the middle of the piping beam. The cooling pipe is also located on the side of the guide beam near the lower roll and below the axial plane of the lower roll.

14. A novel high-precision prestressed rolling mill on a steel rolling line according to claim 13, characterized in that: The cooling pipe is curved on one side, and multiple nozzles are installed at the bend. The other end of the cooling pipe can be connected to a water source, which can provide cooling water to the nozzles.

15. A novel high-precision prestressed rolling mill for steel rolling lines according to any one of claims 1-14, characterized in that: The support column, the preload block, and the tie rod system are arranged symmetrically.

16. A novel high-precision control method for a prestressed rolling mill on a steel rolling line, characterized in that: Controlling a novel high-precision prestressed rolling mill on a steel rolling line as described in any one of claims 1-15 includes the following steps: S1. Connect the rack system; S2. Control the upper and lower nuts on the vertical tie rod to form a preset initial distance between the upper bearing seat and the lower bearing seat; during adjustment, set the spherical pad to ensure that the angular deviation at the connection between the vertical tie rod and the upper and lower bearing seats is automatically compensated, so that the tie rod axis and the bearing seat force surface are kept in a centered state. S3. Control the hydraulic assembly to adjust the positions of the upper bearing seat and the lower bearing seat; S4. Start the pressing device and drive the lead screw through the hydraulic motor to press down the adjacent vertical tie rods synchronously; S5. Control the axial adjustment device, rotate the adjustment rod, and the worm gear seat drives the upper bearing seat to move slightly along the axial direction to correct the axial position of the upper roll; S6. Maintain the stress state of the pressing device and the tie rod system, lock the current adjustment position, and keep the frame system in a stable prestress state during the rolling process.

17. The control method for a novel high-precision prestressed rolling mill on a steel rolling line according to claim 16, characterized in that: In S4, the upper bearing seat and the lower bearing seat slide in the corresponding grooves via the sliding plates on both sides to ensure stable guidance of the bearing seat.

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