Prestressed rolling mill, control method and rolling mill rack positioning device

Abstract

The invention discloses a pre-stress rolling mill, a control method and a rolling mill rack positioning device. The device at least comprises two frame type racks which are symmetrically arranged; a pre-stress cylinder is arranged on an upper beam of each frame type rack, and a driving shaft of each pre-stress cylinder downwards extends out of the upper beam and is positioned below the upper beam; upper bearing seat adjusting devices are mounted on the two sides of the prestress cylinder; an upper bearing seat is mounted between the upper bearing seat adjusting devices on the two sides; a driving shaft of the pre-stress cylinder is connected with the upper bearing seat and is used for providing pre-stress for the upper bearing seat; an adjusting hydraulic cylinder is arranged on a lower beam of each frame type rack, and a driving shaft of each adjusting hydraulic cylinder upwards extends out of the corresponding upper beam and is located above the corresponding lower beam; a lower bearing seat is arranged in the frame type rack below the upper bearing seat in a sliding manner; and a driving shaft of the adjusting hydraulic cylinder is connected with the lower bearing seat. The rolling precision is high, and the adjustment requirement of the rolling mill roll gap can be met through rapid and accurate adjustment of the lower bearing seat on line.

Description

Technical Field

[0001] This invention relates to a prestressed rolling mill and a mill stand positioning device. Background Technology

[0002] Rolling mills are the core equipment in the metal rolling process. The primary indicators for measuring mill performance are its rigidity and rolling bounce, which are essential prerequisites for ensuring product precision. Furthermore, the roll gap needs to be adjusted quickly and precisely according to different rolling specifications and the wear of the rolls themselves. Especially with the current demands for automation and intelligence in rolling lines, the requirements for high precision and rapid response in roll gap adjustment are becoming increasingly important. Currently, the main types of rolling mills used in hot-rolled bar, wire, and section production lines include: archway-type rolling mills, short-stress line rolling mills, and prestressed rolling mills.

[0003] Among them, the archway-type rolling mill can precisely adjust the roll gap when using hydraulic control of the roll gap, but it has disadvantages such as large size, high cost, long stress line, and large deformation. It is mainly used for rolling large-size products.

[0004] Short stress line rolling mills have advantages such as short stress lines and small rolling deformation. However, conventional short stress line rolling mills use mechanical nut and screw methods to adjust the roll gap, which has poor adjustment accuracy, cannot automatically adjust the roll gap, and requires manual verification, resulting in low efficiency.

[0005] Short stress line rolling mills that adopt a fully hydraulic roll gap adjustment technology solution cannot be put into actual production application due to problems such as the synchronization of multiple actuators and excessive cost.

[0006] Prestressed rolling mills apply a prestress greater than the rolling force to the roll bearing housing before rolling, which can ensure that no bouncing occurs except for the rolls during rolling. It is the type of mill with the highest rolling precision. However, because of the prestress, this type of mill cannot meet the requirements for online automatic and precise adjustment of the roll gap.

[0007] Therefore, the present invention aims to explore a high-precision rolling mill with fast response. The rolling mill has the high precision characteristics of a prestressed rolling mill, and at the same time has the characteristics of fast roll gap adjustment response speed and high precision, so as to meet the development needs of high-precision rolling and the automation and intelligence of rolling lines. Summary of the Invention

[0008] To overcome the above-mentioned defects, the present invention provides a prestressed rolling mill and a mill stand positioning device.

[0009] To achieve the above objectives, the present invention provides a mill stand positioning device, comprising two stands symmetrically arranged.

[0010] The frame is a frame structure, and each frame is equipped with crossbeams at the top and bottom.

[0011] The two frames can move relative to each other under the action of external force to complete the joining and disengagement of the two frames;

[0012] One or more positioning cone sleeves and / or positioning pins are provided on the mating surface of one frame; one or more positioning pins and / or positioning cone sleeves are provided on the mating surface of another frame.

[0013] Rotary locking cylinders are installed on both sides of a frame; the piston rod of the rotary locking cylinder reciprocates under the action of hydraulic oil and rotates 90° at the same time; the free end of the piston rod is in the shape of a hook.

[0014] On both sides of the other frame, corresponding to the rotary locking cylinder, there are locking steps and separation steps spaced apart. The height of the locking step is lower than the height of the piston rod in the vertical state, and the height of the separation step is higher than the height of the piston rod.

[0015] The piston rod, under the action of hydraulic oil, locks the two frames by using the hook at its end and the locking step, or separates the two frames by using the engagement of its end and the separation step.

[0016] Furthermore, the rotary locking cylinder includes a cylinder body, and the piston rod is disposed within the cylinder body;

[0017] A guide groove is provided on the middle cylindrical section of the piston rod. The guide groove includes a continuously arranged head groove, a 1 / 4 turn spiral groove and a tail groove. The head groove and the tail groove are arranged along the length direction of the piston rod.

[0018] A positioning sleeve is provided on the cylinder body at the position corresponding to the piston rod. A hemispherical groove is provided inside the positioning sleeve. A positioning ball that cooperates with the guide groove is provided inside the hemispherical groove. A part of the positioning ball is located in the guide groove, and the other part is located in the hemispherical groove.

[0019] To achieve the above objectives, the present invention provides a prestressed rolling mill comprising two symmetrically arranged frames;

[0020] Prestressing cylinders and adjusting hydraulic cylinders are respectively installed on the upper and lower beams of each frame;

[0021] Bearing seats are respectively provided at the free ends of the prestressing cylinder and the adjusting hydraulic cylinder; wherein, the prestressing cylinder is used to provide prestress to the bearing seats; and the adjusting hydraulic cylinder is used to drive the bearing seats to slide up and down.

[0022] On the frames on both sides of the prestressed cylinder, there are upper bearing seat adjustment devices installed on both sides of the bearing seats to adjust the vertical position of the upper bearing seats.

[0023] The rolls are mounted on two corresponding bearing seats;

[0024] A mill stand positioning device as described in claim 1 is provided between the two stands.

[0025] Furthermore, a prestressed cylinder is provided on the upper beam of each frame, and the drive shaft of the prestressed cylinder extends downward from the upper beam and is located below the upper beam;

[0026] An upper bearing seat is slidably disposed in the frame below the prestressed cylinder, corresponding to the drive shaft; the drive shaft of the prestressed cylinder is connected to the upper bearing seat to provide prestress to the upper bearing seat.

[0027] On the frames on both sides of the prestressed cylinder, there are upper bearing seat adjustment devices installed on both sides of the upper bearing seat to adjust the upper and lower positions of the upper bearing seat.

[0028] An adjusting hydraulic cylinder is provided on the lower beam of each frame, and the drive shaft of the adjusting hydraulic cylinder extends upward from the lower beam and is located above the lower beam; a lower bearing seat is slidably arranged in the frame below the upper bearing seat; the drive shaft of the adjusting hydraulic cylinder is connected to the lower bearing seat to drive the lower bearing seat to slide up and down.

[0029] The upper roll is mounted on two upper bearing seats; the lower roll is mounted on two lower bearing seats.

[0030] To achieve the above objectives, the present invention provides a control method for a prestressed rolling mill, the method being implemented based on the aforementioned prestressed rolling mill, characterized by comprising the following steps:

[0031] The position of the upper roll in the frame is adjusted using the upper bearing seat adjustment device;

[0032] By using the prestressed cylinders on both sides to apply prestress greater than the rolling force to the upper bearing seat, the adjustment device is placed under pressure.

[0033] Adjust the hydraulic cylinder to drive the lower bearing housing to the predetermined position in the frame.

[0034] This invention provides the upper bearing housing with prestress greater than the rolling force through an upper prestressing cylinder, placing the adjustment device under pressure. Therefore, during rolling, all parts except the rolls will no longer experience bouncing deformation, greatly improving product rolling accuracy. The bearing housing is connected to the mill frame via an adjusting hydraulic cylinder, which ensures the lower bearing housing has fast response and high precision. In summary, this invention offers high rolling accuracy, allowing for rapid and precise online adjustment of the lower bearing housing to meet the mill roll gap adjustment requirements. Furthermore, the elevation of the rolling centerline can be flexibly adjusted in advance as needed, facilitating the entry of steel billets of various specifications and reducing the occurrence of impacts and steel piling accidents during the rolling process. Attached Figure Description

[0035] Figure 1This is a three-dimensional schematic diagram of the frame of a prestressed rolling mill according to the present invention.

[0036] Figure 2 This is a cross-sectional schematic diagram of the frame of a prestressed rolling mill according to the present invention.

[0037] Figure 3 for Figure 2 The diagram shows a prestressed rolling mill after the rolls are installed.

[0038] Figure 4 This is a schematic diagram of the flexible anti-shaft movement mechanism for the rolls in this invention.

[0039] Figure 5 for Figure 4 A horizontal cross-sectional view.

[0040] Figure 6 for Figure 5 A partial sectional view.

[0041] Figure 7 This is a side view and a front view of a slider.

[0042] Figure 8 These are the side and front views of the locating pin.

[0043] Figure 9 This is a schematic diagram of the deformation of a rolling mill roll under stress.

[0044] Figure 10 This is the working connection state of the frame. The piston rod of the actuating cylinder retracts and locks, and the piston rod is in a vertical position.

[0045] Figure 11 The frame is in the disengaged state. The piston rod of the actuating cylinder extends and rotates to a horizontal position.

[0046] Figure 12 The frame is in the disengaged state. The piston rod of the actuating cylinder continues to extend while maintaining a horizontal position, pushing open the frame.

[0047] Figure 13 The rack is completely detached.

[0048] Figure 14 This is a cross-sectional view of the working cylinder.

[0049] Figure 15 for Figure 14 A three-dimensional schematic diagram of the piston rod. Detailed Implementation

[0050] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0051] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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, they should not be construed as limitations on this invention.

[0052] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0053] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0054] The fast-response high-precision rolling mill of the present invention includes upper and lower roll systems. One roll system bearing housing is connected to the lead screw by a nut, and prestress is applied to the bearing housing by a hydraulic cylinder to realize a prestressed structure and improve rolling accuracy. The other roll system bearing housing is adjusted in position by a hydraulic cylinder, which can realize online fast and accurate adjustment of the roll position.

[0055] As shown in the figure, the present invention includes at least: a prestressed cylinder 1, a frame 2, an upper roller system (upper bearing seat) 3, a lower roller system (lower bearing seat) 4, an adjusting hydraulic cylinder 5, a lead screw 6, a sliding plate 7, a spherical pad 8, a nut 9, a sealing sleeve 10, a pressure cap 11, and a sleeve 12.

[0056] like Figure 1 As shown, the frame 2 includes an operating side frame and a transmission side frame. The frame 2 has a frame structure, as shown in the figure. Viewed from the side, the frame is U-shaped; viewed from above or below, the frame is T-shaped. The frame has crossbeams at both the upper and lower parts, and positioning mechanisms are located at the upper and lower crossbeams. The two frames can be connected together through the positioning mechanisms.

[0057] Each frame has holes and slots for installing prestressed cylinder 1 and adjusting hydraulic cylinder 5 at the top and bottom, respectively. Holes for installing screw rod 6, pressure cap 11 and sleeve 12 are provided on the middle two sides of the frame 2.

[0058] Both the upper bearing seat 3 and the lower bearing seat 4 are combined components with a roller in the middle and bearing seats on both sides.

[0059] The adjustment device for the upper bearing housing 3 includes holes for mounting a lead screw 6, a spherical washer 8, and a nut 9 on both sides of the bearing housing. One end of the spherical washer 8 is flat and is directly mounted on the bearing housing. The inner diameter of the spherical washer 8 is larger than the outer diameter of the thread of the lead screw 6. One end of the nut 9 is a spherical surface that mates with the spherical washer 8, and the inner diameter of the nut 9 is a thread that mates with the lead screw 6.

[0060] The lead screw 6 has a stepped lower section, with a positioning section at the top and bottom of the largest diameter step. The lower positioning section is installed in the frame 2 via a sleeve 12, and the upper positioning section is installed on the frame 2 via a pressure cap 11. The lead screw 6 is positioned on the frame 2 and can only rotate. The lead screw 6 has a threaded section that cooperates with the nut 9 to bear prestress. The top of the lead screw 6 is the drive section, which connects to the rolling mill pressing device and drives the lead screw 6 to rotate and adjust the position of the upper bearing seat 3. The sealing sleeve 10 is fixedly installed on the pressure cap 11, and there is a small gap between its inner and outer rings and the upper bearing seat 3 and the nut 9 to prevent foreign objects from entering.

[0061] After the upper bearing seat 3 is adjusted to the correct position, the prestress cylinders 1 on both sides apply a prestress greater than the rolling force. The lead screw 6 and the spherical pad are under pressure. Since they have already been subjected to a prestress greater than the rolling force, no part except the rolls will bounce or deform during rolling, which greatly improves the rolling accuracy of the product.

[0062] The lower bearing housing 4 is connected to the frame 2 by adjusting the hydraulic cylinder 5. The hydraulic cylinder drive can ensure that the lower bearing housing 4 has the characteristics of fast response speed and high precision.

[0063] Slide plates 7 are provided between the upper bearing housing 3 and the lower bearing housing 4 and the frame 2 to facilitate adjustment of the clearance and replacement after wear.

[0064] Since the rolls rotate, direct positioning is difficult. As a further improvement to this invention, such as... Figures 4 to 6 As shown, an anti-axial movement mechanism is installed on the bearing housing that is integrated with the roll. By setting a flexible anti-axial movement mechanism at the center of the bearing housing, the axial movement of the roll can be prevented, thus improving product accuracy. At the same time, the roll can be allowed to bend and deform. The flexible connection method improves the working conditions of the rolling mill and extends its service life.

[0065] The flexible anti-shaft movement mechanism for the rolls includes at least: bearing housing 2, frame 3, slide plate 7, cover 35, pressure plate 36, slider 37, sleeve 38, positioning pin 39, and screws, etc.

[0066] The roll and bearing housing 3 are axially connected as one unit. A sliding plate 7 is provided between the bearing housing and the frame 2 for precise adjustment of the sliding clearance and for easy replacement.

[0067] A rectangular guide groove is provided on the frame 2 at the center of the corresponding bearing seat 3, and the rolling mill roll system (rolls, bearing seats, etc.) can be adjusted relative to the frame as needed.

[0068] Locating pin 39 is a stepped shaft, such as Figure 8 As shown, one side is fixedly installed on both sides of the bearing housing 3 by screws, and the sleeve 38 is installed on the shaft on the other side of the positioning pin 39 by the pressure plate 36 and screws. The length of the sleeve 38 is greater than the length of the corresponding section of the positioning pin 39.

[0069] Slider 37 has two relative settings, such as Figure 7 As shown, its external shape is rectangular with a circular hole in the middle. The center of the circular hole is outside the slider 37, and the arc segment is smaller than a semicircle for easy installation. The length of the slider 37 is less than the length of the sleeve 38, and the pressure plate 36 does not lock the slider 37.

[0070] The installation process of the flexible anti-shaft movement mechanism for the rolls is as follows:

[0071] 1) After the slide plate 7 is installed on the bearing seat 3, it is installed in the frame 2 as a whole;

[0072] 2) Adjust the bearing housing 3 to the position of the rectangular guide groove of the frame 2, and install the positioning pin 39 on the bearing housing 3;

[0073] 3) Install sleeve 38 on positioning pin 39, and then install two sliders 37 from the rectangular guide slot of frame 3 between frame and sleeve 38;

[0074] 4) Install the pressure plate 36. Since the length of the sleeve 38 is greater than the length of the corresponding section of the positioning pin 39, and the length of the slider 37 is less than the length of the sleeve 38, the sleeve 38 is locked and the slider 37 is not locked.

[0075] 5) Install cover 35 on frame 3 to prevent debris from entering.

[0076] 6. After the sleeve 38 and two sliders 37 are installed on the positioning pin 39, the overall radial width is matched with the width of the rectangular guide groove on the frame 2, with a slight gap, which prevents the entire roller system from moving around, while also allowing the entire roller system to be adjusted relative to the frame.

[0077] The aforementioned flexible anti-shaft movement mechanism for the rolls causes the rolls to rotate around the center of the bearing housing under radial rolling force (the slider 37 is installed in the frame 2 and does not rotate on its own, but rotates relative to the sleeve 38). The flexible connection improves the working conditions of the equipment.

[0078] The aforementioned positioning mechanism includes at least a rotary locking cylinder 22, a guide key 24, a positioning cone sleeve 25, and a positioning pin 26.

[0079] As shown in the figure, the rotary locking cylinder 22 is mounted on a frame and includes a piston rod 22.1, a rotating ball 22.2, a sleeve 22.3, and a cylinder body 22.4. The piston rod 22.1 has a guide groove on its central cylindrical section, which includes two straight grooves at the beginning and end, and a 1 / 4-turn spiral groove in the middle. The head of the piston rod 22.1 is hook-shaped. The sleeve 22.3 has a spherical groove, the depth of which is less than its radius. The rotating ball 22.2 is installed in the sleeve 22.3 and engages with the guide groove on the piston rod 22.1. The piston rod 22.1 reciprocates under the action of hydraulic oil and simultaneously rotates 90°.

[0080] When the rotary locking cylinder 22 is fully retracted, the piston rod 22.1 is defined as being in a horizontal state; when the rotary locking cylinder 22 is fully extended, the piston rod 22.1 is defined as being in a vertical state.

[0081] Description of the motion state of the rotary locking cylinder 22:

[0082] 1) The piston rod 22.1 is fully retracted and in a horizontal position;

[0083] 2) The piston rod 22.1 extends from the straight groove section at the tail end to the spiral groove section, and remains horizontal throughout.

[0084] 3) The piston rod 22.1 extends into the helical groove section and begins to rotate from a horizontal state to a vertical state;

[0085] 4) The piston rod 22.1 is fully extended from the helical groove section and rotated to a vertical position;

[0086] 5) The piston rod 22.1 continues to extend in the straight groove section at the head, maintaining a vertical position.

[0087] At the joint surface of the upper and lower crossbeams of another frame, steps of different heights are provided, including a locking step 27 and a separating step 28. The height of the locking step 27 is lower than the height of the piston rod 22.1 in its vertical state, while the height of the separating step 28 is higher than the height of the piston rod 22.1. The piston rod 22.1 locks and separates the frame by cooperating with the locking step and the separating step. On both sides of the joint surface of the upper and lower crossbeams of the frame, there are grooves for cooperating with the guide key 24 and holes for installing the positioning cone sleeve 25.

[0088] A mounting step 29 is provided on the frame where the locking cylinder is located. The mounting step is used to position the rotating locking cylinder 2 and to bear the locking reaction force during operation. Rectangular grooves for mounting guide keys and holes for mounting positioning pins 26 are respectively provided on both sides of the joint surface of the upper and lower crossbeams of the frame.

[0089] The guide key 24 has a rectangular bottom and beveled sides at the head, which mates with a groove on another frame. The guide key 24 is mounted on the frame with screws.

[0090] The locating pin 26 has a cylindrical bottom and a conical head, which mates with the locating cone sleeve 25 on another frame 1. The locating pin 26 is mounted on the frame by screws. The locating pin 26 has a threaded hole with a smaller diameter than the nominal diameter of the screw. The screw is installed in the same way as a normal round hole. When the locating pin 26 needs to be disassembled, it can be assisted by a matching screw.

[0091] When connecting the two frames, the rotary locking cylinder 22 retracts, and the piston rod 22.1 is in a horizontal position, engaging with the locking step on the frame for locking. When the two frames need to be separated, the rotary locking cylinder 22 extends, and the piston rod 22.1 rotates to a vertical position, contacting the separation step on the frame before continuing to extend horizontally, pushing the two frames apart. When the locking cylinder 22 is fully extended, the positioning cone pins and guide keys on both frames are completely separated, allowing the two frames to be easily pulled apart for roll replacement.

[0092] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described above. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Many other changes and modifications made without departing from the concept and scope of the present invention should be considered within the scope of protection of the present invention.

[0093] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0094] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A rolling mill stand positioning device, characterized in that, Includes two symmetrically arranged racks; The frame is a frame structure, and each frame is equipped with crossbeams at the top and bottom. The two frames can move relative to each other under the action of external force to complete the joining and disengagement of the two frames; One or more positioning cone sleeves and / or positioning pins are provided on the mating surface of one frame; one or more positioning pins and / or positioning cone sleeves are provided on the mating surface of another frame. Rotary locking cylinders are installed on both sides of a frame; the piston rod of the rotary locking cylinder reciprocates under the action of hydraulic oil and rotates 90° at the same time; the free end of the piston rod is in the shape of a hook. On both sides of the other frame, corresponding to the rotary locking cylinder, there are locking steps and separation steps spaced apart. The height of the locking step is lower than the height of the piston rod in the vertical state, and the height of the separation step is higher than the height of the piston rod. The piston rod, under the action of hydraulic oil, locks the two frames by using the hook at its end and the locking step, or separates the two frames by using the engagement of its end and the separation step.

2. The mill stand positioning device as described in claim 1, characterized in that, The rotary locking cylinder includes a cylinder body, and the piston rod is disposed within the cylinder body; A guide groove is provided on the middle cylindrical section of the piston rod. The guide groove includes a continuously arranged head groove, a 1 / 4 turn spiral groove and a tail groove. The head groove and the tail groove are arranged along the length direction of the piston rod. A positioning sleeve is provided on the cylinder body at the position corresponding to the piston rod. A hemispherical groove is provided inside the positioning sleeve. A positioning ball that cooperates with the guide groove is provided inside the hemispherical groove. A part of the positioning ball is located in the guide groove, and the other part is located in the hemispherical groove.

3. A prestressed rolling mill, characterized in that, Includes two symmetrically arranged racks; Prestressing cylinders and adjusting hydraulic cylinders are respectively installed on the upper and lower beams of each frame; Bearing seats are respectively provided at the free ends of the prestressing cylinder and the adjusting hydraulic cylinder; wherein, the prestressing cylinder is used to provide prestress to the bearing seats; and the adjusting hydraulic cylinder is used to drive the bearing seats to slide up and down. On the frames on both sides of the prestressed cylinder, there are upper bearing seat adjustment devices installed on both sides of the bearing seats to adjust the vertical position of the upper bearing seats. The rolls are mounted on two corresponding bearing seats; A mill stand positioning device as described in claim 1 is provided between the two stands.

4. The prestressed rolling mill as described in claim 3, characterized in that, A prestressing cylinder is installed on the upper beam of each frame, and the drive shaft of the prestressing cylinder extends downward from the upper beam and is located below the upper beam; An upper bearing seat is slidably disposed in the frame below the prestressed cylinder, corresponding to the drive shaft; the drive shaft of the prestressed cylinder is connected to the upper bearing seat to provide prestress to the upper bearing seat. On the frames on both sides of the prestressed cylinder, there are upper bearing seat adjustment devices installed on both sides of the upper bearing seat to adjust the upper and lower positions of the upper bearing seat. An adjusting hydraulic cylinder is provided on the lower beam of each frame, and the drive shaft of the adjusting hydraulic cylinder extends upward from the lower beam and is located above the lower beam; a lower bearing seat is slidably arranged in the frame below the upper bearing seat; the drive shaft of the adjusting hydraulic cylinder is connected to the lower bearing seat to drive the lower bearing seat to slide up and down. The upper roll is mounted on two upper bearing seats; the lower roll is mounted on two lower bearing seats.

5. A control method for a prestressed rolling mill, the method being implemented based on the prestressed rolling mill as described in claim 3, characterized in that, Includes the following steps: The position of the upper roll in the frame is adjusted using the upper bearing seat adjustment device; By using the prestressed cylinders on both sides to apply prestress greater than the rolling force to the upper bearing seat, the adjustment device is placed under pressure. Adjust the hydraulic cylinder to drive the lower bearing housing to the predetermined position in the frame.

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