Intermediate roll shifting device for an eighteen-roller rolling mill and roll shifting method

Abstract

The application discloses a middle roller shifting method and device for an eighteen-roller rolling mill. The device comprises locking devices, transverse shifting driving devices and position detecting devices. The locking devices lock the operation side fixed bearing seat of the middle roller on the rolling mill frame through the driving of the locking hydraulic cylinders and the locking plates. The transverse shifting driving devices drive the locking keys to be clamped into the shaft end clamping grooves of the driving side bearing seat and drive the middle roller to axially shift through the driving of the transverse shifting hydraulic cylinders. The position detecting devices are displacement sensor assemblies. The displacement sensors of the position detecting devices are fixed on the reference seats which are fixed relative to the rolling mill frame. The magnetic rings are installed on the locking keys to directly measure the axial displacement of the locking keys. The transverse shifting driving devices of the inlet side and the outlet side of the upper middle roller and the transverse shifting driving devices of the inlet side and the outlet side of the lower middle roller are independently provided with a set of position detecting devices. The transverse shifting hydraulic cylinders are synchronously controlled in a closed loop based on the displacement feedback signals of the position detecting devices. The application ensures the stability of the shifting reference of the middle roller and solves the stepping problem of the shifting of the middle roller caused by the asynchronization of the multiple cylinders.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical engineering equipment technology, specifically relating to an intermediate roll shifting device for an 18-roll mill, and also to a method for shifting intermediate rolls for an 18-roll mill. Background Technology

[0002] In the production of cold-rolled strip steel, shape control is a crucial step in ensuring the quality of the finished product. As a high-precision cold-rolling equipment, the 18-roll mill's shape adjustment capability largely depends on the axial roll movement control of the intermediate roll. By moving the intermediate roll axially to a preset position adapted to the strip width, and coordinating with the positive and negative bending operations of the work rolls, the harmful bending moment distribution between the rolls can be effectively improved. This enhances the mill's ability to adjust the strip shape, controls the strip's straightness, reduces edge thinning, and ultimately improves the quality of the finished strip steel.

[0003] However, the existing intermediate roll shifting technology for 18-roll mills still has the following shortcomings in practical applications: First, the locking reliability is insufficient. During the rolling process, the fixed bearing seat on the operating side of the intermediate roll may experience axial displacement due to an unreasonable design of the locking mechanism or insufficient locking force. Once the axial position of the fixed bearing seat shifts, the roll shifting reference of the intermediate roll is destroyed, resulting in a decrease in the accuracy of strip shape control. In severe cases, it may cause poor strip shape or even strip breakage.

[0004] Second, poor lateral movement synchronization. Eighteen-roll mills typically have lateral movement drive devices installed on the inlet and outlet sides of the upper and lower intermediate rolls, requiring a total of four drive devices to coordinate their operation. In existing technology, due to the lack of independent, precise detection and closed-loop control of the displacement of each drive device, the four drive devices are prone to asynchrony during operation, a phenomenon known as the "stepping" problem. This asynchrony causes the intermediate rolls to tilt during movement, affecting not only the accuracy of the roll position but also exacerbating uneven wear of the rolls and thinning of the strip edges.

[0005] Third, the position control accuracy is low. Some existing roll shifting devices rely solely on the stroke control of hydraulic cylinders or simple limit switches for position control, lacking direct and accurate measurement and feedback of the actual roll shifting displacement of the intermediate roll. This makes it difficult to achieve high-precision automated roll shifting control, affecting production efficiency and product consistency.

[0006] Therefore, how to improve the locking reliability, lateral movement synchronization and position control accuracy of the intermediate rolls of an 18-roll mill has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] The primary objective of this invention is to provide an intermediate roll shifting device for an 18-roll mill, which solves the technical problem of poor lateral movement synchronization caused by the lack of independent position detection in the four-corner lateral movement drive of existing devices.

[0008] The second objective of this invention is to provide a method for intermediate roll shifting in an 18-roll mill, which solves the technical problem that existing methods cannot independently detect and synchronously control the displacement of the four corner transverse drive ends, resulting in asynchronous intermediate roll shifting.

[0009] The first technical solution adopted in this invention is a method for shifting intermediate rolls in an 18-roll mill, comprising the following steps: The fixed bearing housing on the operating side of the intermediate roll is locked to the mill stand to restrict its axial movement; The drive end of a transverse drive device is inserted into the slot at the shaft end of the bearing seat on the intermediate roller drive side. The intermediate roller is driven to move axially by a transverse drive device; During the lateral movement, independent position detection devices are used on the upper intermediate roller inlet side, upper intermediate roller outlet side, lower intermediate roller inlet side, and lower intermediate roller outlet side to detect the displacement of each drive end in real time. Based on the feedback from the position detection devices, the displacement of each lateral drive device is synchronously controlled to prevent the intermediate rollers from moving asynchronously.

[0010] The first technical solution of this invention is further characterized by: The specific steps for locking the fixed bearing seat on the operating side of the intermediate roll to the mill stand are as follows: a locking plate is driven to extend by a locking hydraulic cylinder and engage in the corresponding slot on the fixed bearing seat; the transverse drive device includes a locking key and a transverse hydraulic cylinder, the locking key constitutes the drive end, and the transverse hydraulic cylinder drives the locking key to move along the axial direction of the intermediate roll.

[0011] The position detection device is a displacement sensor assembly, which includes a displacement sensor and a magnetic ring. The displacement sensor is fixed on a reference base that is fixed relative to the mill stand, and the magnetic ring is mounted on a locking key, so that the displacement sensor can directly measure the displacement of the locking key relative to the reference base.

[0012] It also includes: detecting the limit position of the locking key by proximity switch before and after the start and end of the roll shifting, in order to perform zero-position calibration or overtravel protection.

[0013] The second technical solution adopted in this invention is an intermediate roll shifting device for an 18-roll mill, comprising: A locking device is used to lock the fixed bearing seat on the operating side of the intermediate roll onto the mill stand to restrict its axial movement; A transverse drive device has a drive end, which is used to engage in the groove of the bearing seat shaft end of the intermediate roller drive side, so as to drive the intermediate roller to move axially under the drive of the transverse drive device. A position detection device is used to directly detect the axial displacement of the drive end; The transverse drive devices for the inlet and outlet sides of the upper intermediate roller and the inlet and outlet sides of the lower intermediate roller are each equipped with an independent position detection device.

[0014] The second technical solution of the present invention is further characterized by: The locking device includes a locking hydraulic cylinder and a locking plate. The cylinder body of the locking hydraulic cylinder is fixed on the mill stand, and its piston rod is connected to the locking plate to drive the locking plate to engage or disengage from the slot on the fixed bearing seat. The lateral movement drive device includes a lateral movement hydraulic cylinder and a locking key. The cylinder body of the lateral movement hydraulic cylinder is fixed on the locking plate to move synchronously with the locking plate. The piston rod of the lateral movement hydraulic cylinder is connected to the locking key, and the locking key constitutes the drive end.

[0015] The position detection device is a displacement sensor assembly, which includes a displacement sensor and a magnetic ring. The displacement sensor is fixed on a reference base, which is fixed relative to the mill stand. The magnetic ring is mounted on a locking key and moves synchronously with the locking key. The reference base is a locking plate guide seat, which is fixedly installed on the mill stand or integrated with the cylinder body of the locking hydraulic cylinder. The locking plate slides and is guided within the locking plate guide seat.

[0016] The piston rod end of the transverse hydraulic cylinder is a T-shaped head, and the locking key is provided with a T-shaped groove that matches the T-shaped head. The piston rod of the transverse hydraulic cylinder pulls the locking key through the cooperation of the T-shaped head and the T-shaped groove; the magnetic ring is installed on the outer peripheral surface of the mounting block of the locking key.

[0017] It also includes a protective cover and / or a proximity switch. The protective cover is placed over the displacement sensor and fixed to the reference base. The proximity switch is mounted on the reference base and configured to detect whether the locking key has reached a preset limit position.

[0018] The four transverse drive devices on the upper intermediate roll inlet side, upper intermediate roll outlet side, lower intermediate roll inlet side, and lower intermediate roll outlet side are configured to perform closed-loop synchronous control based on the position signals fed back by their respective position detection devices.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention separates the bearing housing locking function from the intermediate roll lateral movement function. The locking hydraulic cylinder drives the locking plate to rigidly lock the operating side fixed bearing housing to the mill stand, ensuring the stability and reliability of the roll shifting reference during the rolling process. At the same time, each of the four lateral movement drive devices on the upper intermediate roll inlet side, upper intermediate roll outlet side, lower intermediate roll inlet side, and lower intermediate roll outlet side is independently equipped with a displacement sensor assembly with the fixed reference seat as a reference. This assembly directly detects the actual axial displacement of each locking key and performs closed-loop synchronous control of each lateral movement hydraulic cylinder based on the four independent displacement feedback signals. This effectively eliminates the "stepping" problem caused by the asynchrony of multiple cylinders, significantly improves the positional accuracy and synchronization of the intermediate roll shifting, and provides precise roll shifting position assurance for strip shape control. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the intermediate roll shifting device for an 18-roll mill according to the present invention; Figure 2 yes Figure 1 Top view; Figure 3 yes Figure 1 The left view.

[0021] In the diagram: 1. Locking hydraulic cylinder, 2. Locking plate guide seat, 3. Upper intermediate roll operating side fixed bearing seat, 4. Lower intermediate roll operating side fixed bearing seat, 5. Mill stand, 6. Protective cover, 7. Displacement sensor assembly, 8. Locking key mounting block, 9. Locking plate, 10. Transverse hydraulic cylinder, 11. Transverse hydraulic cylinder piston rod, 12. Locking key, 13. Drive side bearing seat shaft end slot, 14. Intermediate roll. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] To make the technical solution of this application clearer and easier to understand, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0024] Example 1 This embodiment discloses an intermediate roll shifting device for an 18-roll mill, such as... Figures 1 to 3 As shown, the intermediate rolls 14 of the 18-roll mill include an upper intermediate roll and a lower intermediate roll. Each intermediate roll 14 has a fixed bearing seat on its operating side and a bearing seat on its transmission side. On the mill stand 5, corresponding to the inlet and outlet sides of the upper intermediate roll and the inlet and outlet sides of the lower intermediate roll, there are four sets of identical transverse drive devices. Each set of transverse drive devices is independently equipped with a position detection device.

[0025] Specifically as follows: The locking device includes a locking hydraulic cylinder 1 and a locking plate 9. The cylinder body of the locking hydraulic cylinder 1 is fixed to the mill stand 5, and the piston rod of the locking hydraulic cylinder 1 is connected to one end of the locking plate 9. The locking plate guide seat 2 is fixedly installed on the mill stand 5, and the locking plate 9 slides within the locking plate guide seat 2. When it is necessary to lock the fixed bearing seat on the operating side of the intermediate roll 14, the piston rod of the locking hydraulic cylinder 1 extends, driving the locking plate 9 to slide along the axial direction of the intermediate roll 14 within the locking plate guide seat 2, so that the other end of the locking plate 9 engages in the corresponding slot on the fixed bearing seat on the operating side of the intermediate roll 14. At this time, the axial position of the fixed bearing seat relative to the mill stand 5 is locked and cannot move with the axial movement of the intermediate roll 14.

[0026] When unlocking is required, the piston rod of the locking hydraulic cylinder 1 retracts, driving the locking plate 9 to disengage from the slot on the fixed bearing seat, and the fixed bearing seat returns to its free state.

[0027] The lateral movement drive device includes a lateral movement hydraulic cylinder 10 and a locking key 12. The cylinder body of the lateral movement hydraulic cylinder 10 is fixed to the end face of the locking plate 9 and can move synchronously with the locking plate 9. The piston rod 11 of the lateral movement hydraulic cylinder is provided with a T-shaped head at its end.

[0028] The locking key 12 includes a locking part and a mounting block 8. The locking part is located at the front end of the locking key 12, forming the drive end of the transverse drive device, and is used to engage with the shaft end slot 13 of the intermediate roller 14 transmission side bearing seat. The mounting block 8 is located at the rear end of the locking key 12 and is integrally formed with the locking part. The mounting block 8 has a T-slot that matches the T-head of the transverse hydraulic cylinder piston rod 11. The transverse hydraulic cylinder piston rod 11 is detachably connected to the locking key 12 through the cooperation of the T-head and the T-slot.

[0029] When the intermediate roller 14 needs to move, the locking key 12, driven by the transverse hydraulic cylinder 10, engages with the locking part of the locking key into the slot 13 at the shaft end of the transmission side bearing seat; the piston rod 11 of the transverse hydraulic cylinder 10 extends and retracts, and through the cooperation of the T-head and the T-slot, pulls the locking key 12 to move axially along the intermediate roller 14. The locking key 12 then drives the entire intermediate roller 14 to move axially through the slot 13 at the shaft end of the transmission side bearing seat, thereby achieving precise adjustment of the position of the intermediate roller 14.

[0030] The position detection device is a displacement sensor assembly 7, which includes a displacement sensor and a magnetic ring. The displacement sensor is fixed on the lock plate guide seat 2, which is fixed relative to the rolling mill stand 5. An annular groove is formed on the outer circumferential surface of the mounting block 8, and the magnetic ring is embedded in the annular groove, which can move synchronously with the locking key 12. When the piston rod 11 of the transverse hydraulic cylinder 10 drives the locking key 12 to move axially, the magnetic ring moves together with the locking key 12. The displacement sensor detects the position change of the magnetic ring in real time, thereby directly measuring the axial displacement of the locking key 12 relative to the lock plate guide seat 2.

[0031] The displacement sensor assembly 7 also includes a protective cover 6, which covers the outside of the displacement sensor and is fixed to the lock plate guide seat 2 to prevent impact and foreign objects from entering, and to ensure that the displacement sensor works stably for a long time in the harsh rolling environment.

[0032] A proximity switch is also installed on the locking plate guide seat 2, configured to detect whether the locking key 12 has reached the preset limit position. Before and after the roll shifting begins, the limit position of the locking key 12 is detected by the proximity switch, which can be used for zero-position calibration or overtravel protection to ensure the safety and reliability of the roll shifting operation.

[0033] Each set of transverse drive devices on the upper intermediate roll inlet side, upper intermediate roll outlet side, lower intermediate roll inlet side, and lower intermediate roll outlet side is independently equipped with a set of the aforementioned displacement sensor assembly 7. During the roll shifting process, the control system receives the position signals fed back by each of the four displacement sensor assemblies 7, and performs closed-loop synchronous control on the displacement of the four transverse hydraulic cylinders 10 to ensure that the four sets of transverse drive devices operate synchronously and prevent the intermediate rolls 14 from shifting asynchronously.

[0034] This embodiment separates the locking function from the lateral movement function. The locking plate 9 ensures that the working position of the fixed bearing seat on the operating side of the intermediate roller 14 remains fixed. The lateral movement hydraulic cylinder 10, in conjunction with the displacement sensor assembly 7, achieves high-precision position adjustment. The four corners are independently configured with displacement sensor assemblies 7, and closed-loop synchronous control is performed based on their respective feedback signals. This effectively solves the "stepping" problem caused by the asynchrony of multiple cylinders, significantly improves the positional accuracy and synchronization of the intermediate roller 14, and lays a solid foundation for strip shape control.

[0035] Example 2 This embodiment is basically the same as embodiment 1, except that the direction of movement of the locking hydraulic cylinder 1 driving the locking plate 9 corresponds to the locking / unlocking state.

[0036] In this embodiment, the locking hydraulic cylinder 1 drives the locking plate 9 as follows: when the piston rod of the locking hydraulic cylinder 1 retracts, it drives the locking plate 9 to extend and engage in the slot of the fixed bearing seat to achieve locking; when the piston rod extends, it drives the locking plate 9 to retract to achieve unlocking. This solution can also achieve the function of locking the fixed bearing seat on the operating side of the intermediate roll 14 onto the mill stand 5, and can adapt to different installation spaces and working conditions. The remaining structure and working principle are the same as in Embodiment 1, and will not be described again here.

[0037] Example 3 This embodiment is basically the same as embodiment 1, except that the connection method between the piston rod 11 of the transverse hydraulic cylinder 10 and the locking key 12 is different.

[0038] In this embodiment, the piston rod 11 of the transverse hydraulic cylinder 10 is provided with an external thread at its end, and the locking key mounting block 8 is provided with an internal thread hole that matches the external thread. The piston rod 11 of the transverse hydraulic cylinder is fixedly connected to the locking key 12 through a threaded fit. When it is necessary to disassemble or replace the locking key 12, it can be separated from the piston rod 11 of the transverse hydraulic cylinder by rotating the locking key 12. This alternative solution can also achieve the function of driving the locking key 12 to move axially by the transverse hydraulic cylinder 10, and is suitable for working conditions with high requirements for connection reliability and low maintenance frequency. The remaining structure and working principle are the same as in Embodiment 1, and will not be described again here.

[0039] Example 4 This embodiment is basically the same as Embodiment 1, except for the installation reference of the displacement sensor.

[0040] In this embodiment, the mounting reference for the displacement sensor is not the locking plate guide seat 2, but an independent mounting bracket. This mounting bracket is fixed to the mill stand 5 and is independent of the locking plate guide seat 2. The displacement sensor is fixed to this mounting bracket, and the magnetic ring is still mounted on the locking key mounting block 8. Since the mounting bracket is fixed relative to the mill stand 5, the displacement sensor can still measure the axial displacement of the locking key 12 with a fixed reference. This solution is particularly suitable for mill retrofit projects, as it allows the addition of the displacement sensor assembly 7 without replacing the original locking plate guide seat 2, reducing retrofit costs and construction difficulty. The remaining structure and working principle are the same as in Embodiment 1, and will not be described again here.

[0041] Example 5 This embodiment is basically the same as embodiment 1, except that the connection method between the locking plate guide seat 2 and the cylinder body of the locking hydraulic cylinder 1 is different.

[0042] In this embodiment, the locking plate guide seat 2 and the cylinder body of the locking hydraulic cylinder 1 are integrated into one unit, forming an integral structural component, which is fixedly installed on the rolling mill stand 5. The locking plate 9 slides and is guided within the guide groove of this integral structural component, and the piston rod of the locking hydraulic cylinder 1 drives the locking plate 9 to extend or retract along the guide groove. Since the locking plate guide seat 2 and the cylinder body of the locking hydraulic cylinder 1 are integrated into one unit, the number of parts and assembly steps are reduced, improving the overall rigidity and assembly accuracy. At the same time, the displacement sensor still uses this integrated structure as a fixed reference, and the measurement accuracy is not affected. The remaining structure and working principle are the same as in Embodiment 1, and will not be described again here.

[0043] Example 6 This embodiment discloses a method for shifting intermediate rolls in an 18-roll mill, which can be executed by the apparatus of any of the above embodiments.

[0044] Before strip rolling, the target roll position of intermediate roll 14 is determined according to the strip width and process requirements. The specific operating steps are as follows: Step 1: Unlock the operating side fixed bearing housing If the fixed bearing seat on the operating side of the intermediate roller 14 is in the locked state, the locking hydraulic cylinder 1 drives the locking plate 9 to retract, causing the locking plate 9 to disengage from the slot on the fixed bearing seat, and the fixed bearing seat returns to its free state. If it is already in the unlocked state, proceed directly to step two.

[0045] Step 2: Insert the driver terminal The lateral hydraulic cylinder 10 drives the locking key 12 to move axially along the intermediate roller 14, causing the locking key 12 to engage in the slot 13 at the shaft end of the drive-side bearing seat of the intermediate roller 14. The engagement can be confirmed by feedback signals from a proximity switch or displacement sensor assembly 7.

[0046] Step 3: Axial movement The piston rod 11 of the transverse hydraulic cylinder 10 extends and retracts, and the locking key 12 is pulled along the axial direction of the intermediate roller 14 by the cooperation of the T-head and the T-slot. The locking key 12 drives the intermediate roller 14 to move axially to the target position through the slot 13 at the shaft end of the transmission side bearing seat.

[0047] During the lateral movement, four displacement sensor assemblies 7 on the inlet side of the upper intermediate roller, the outlet side of the upper intermediate roller, the inlet side of the lower intermediate roller, and the outlet side of the lower intermediate roller respectively detect the axial displacement of their corresponding locking keys 12 in real time and feed the position signals back to the control system. The control system performs closed-loop synchronous control on the displacement of each transverse hydraulic cylinder 10 based on the feedback signals from the four displacement sensor assemblies 7.

[0048] The closed-loop synchronous control is as follows: the control system presets the target displacement of the intermediate roller 14; four displacement sensor assemblies 7 detect the actual displacement of their respective locking keys 12 in real time and feed the position signals back to the control system; the control system compares the four actual displacements with the target displacement, and independently adjusts the oil supply of each transverse hydraulic cylinder 10 according to the comparison results, so that the actual displacements of the four locking keys 12 all reach the target displacement. During the adjustment process, the control system monitors the displacement deviation between the four locking keys 12 in real time. When the displacement deviation on any side exceeds the preset tolerance range, the control system pauses the roller movement, corrects the deviation, and then continues to synchronize the roller movement to ensure that the four sets of transverse drive devices operate synchronously and prevent the intermediate roller 14 from moving asynchronously.

[0049] Step 4: Lock the operating side fixed bearing housing After the intermediate roll 14 reaches the target position, the locking hydraulic cylinder 1 drives the locking plate 9 to extend and engage in the slot on the fixed bearing seat, thus axially locking the fixed bearing seat relative to the mill stand 5. At this time, the axial position of the intermediate roll 14 is fixed during the rolling process and will not shift axially due to changes in rolling force.

[0050] Step 5: Extreme Position Detection Before and after the roll shifting begins, a proximity switch installed on the lock plate guide seat 2 can be used to detect whether the locking key 12 has reached the preset limit position, so as to perform zero-position calibration or overtravel protection, ensuring the safety and reliability of the roll shifting operation.

[0051] This invention locks the fixed bearing seat on the operating side by locking plate 9, ensuring that the position of the intermediate roll 14 remains constant during rolling. By independently configuring displacement sensor assemblies 7 at the four corners and combining them with closed-loop synchronous control, it effectively prevents the problem of asynchrony when the intermediate roll 14 moves laterally. The lateral position control is precise, the adjustment accuracy is high, and the load-bearing capacity is strong. It can realize the electronically controlled automated operation of the lateral movement of the intermediate roll 14, which significantly improves production efficiency and the quality of finished strip steel.

[0052] This document uses specific examples to illustrate the principles and implementation methods of this application. The various embodiments are progressive, with each embodiment focusing on its differences from others. Similar or identical parts between embodiments can be referred to interchangeably. The descriptions of the above embodiments are merely for the purpose of helping to understand the method and core ideas of this application. For those skilled in the art, various improvements and modifications can be made to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of this application.

[0053] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

Claims

1. A method for shifting intermediate rolls in an 18-roll mill, characterized in that, Includes the following steps: The fixed bearing seat on the operating side of the intermediate roll (14) is locked onto the mill stand (5) to restrict its axial movement; Insert the drive end of a transverse drive device into the slot (13) at the shaft end of the bearing seat on the intermediate roller drive side; The intermediate roller (14) is driven to move axially by the transverse drive device; During the lateral movement, position detection devices are independently configured for the upper intermediate roller inlet side, upper intermediate roller outlet side, lower intermediate roller inlet side and lower intermediate roller outlet side to detect the displacement of each drive end in real time. Based on the feedback from the position detection devices, the displacement of each lateral drive device is synchronously controlled to prevent the intermediate roller (14) from moving asynchronously.

2. The method for shifting intermediate rolls in an 18-roll mill according to claim 1, characterized in that, The specific steps of locking the fixed bearing seat on the operating side of the intermediate roll (14) onto the mill stand (5) are as follows: a locking plate (9) is driven to extend by a locking hydraulic cylinder (1) and engage in the corresponding slot on the fixed bearing seat; the transverse drive device includes a locking key (12) and a transverse hydraulic cylinder (10), the locking key (12) constitutes the drive end, and the transverse hydraulic cylinder (10) drives the locking key (12) to move axially along the intermediate roll (14).

3. The method for shifting intermediate rolls in an 18-roll mill according to claim 2, characterized in that, The position detection device is a displacement sensor assembly (7), which includes a displacement sensor and a magnetic ring. The displacement sensor is fixed on a reference base that is fixed relative to the mill stand (5). The magnetic ring is installed on the locking key (12) so that the displacement sensor can directly measure the displacement of the locking key (12) relative to the reference base.

4. The method for shifting intermediate rolls in an 18-roll mill according to claim 3, characterized in that, Also includes: Before and after the roller shifting begins, the limit position of the locking key (12) is detected by a proximity switch for zero-position calibration or overtravel protection.

5. An intermediate roll shifting device for an 18-roll mill, used to implement the method as described in any one of claims 1 to 4, characterized in that, include: A locking device is used to lock the fixed bearing seat on the operating side of the intermediate roll (14) onto the mill stand (5) to restrict its axial movement; The transverse drive device has a drive end, which is used to engage in the groove (13) at the shaft end of the intermediate roller drive side bearing seat so as to drive the intermediate roller (14) to move axially under the drive of the transverse drive device. A position detection device is used to directly detect the axial displacement of the drive end; The transverse drive devices for the inlet and outlet sides of the upper intermediate roller and the inlet and outlet sides of the lower intermediate roller are each equipped with an independent position detection device.

6. The intermediate roll shifting device for an 18-roll mill according to claim 5, characterized in that, The locking device includes a locking hydraulic cylinder (1) and a locking plate (9). The cylinder body of the locking hydraulic cylinder (1) is fixed on the mill stand (5), and its piston rod is connected to the locking plate (9) to drive the locking plate (9) to engage or disengage from the slot on the fixed bearing seat. The transverse drive device includes a transverse hydraulic cylinder (10) and a locking key (12). The cylinder body of the transverse hydraulic cylinder (10) is fixed on the locking plate (9) to move synchronously with the locking plate (9). The piston rod (11) of the transverse hydraulic cylinder (10) is connected to the locking key (12), and the locking key (12) constitutes the drive end.

7. The intermediate roll shifting device for an 18-roll mill according to claim 6, characterized in that, The position detection device is a displacement sensor assembly (7), which includes a displacement sensor and a magnetic ring. The displacement sensor is fixed on a reference base, which is fixed relative to the mill stand (5). The magnetic ring is installed on the locking key (12) and moves synchronously with the locking key (12). The reference base is a locking plate guide seat (2), which is fixedly installed on the mill stand (5) or integrated with the cylinder body of the locking hydraulic cylinder (1). The locking plate (9) slides and guides within the locking plate guide seat (2).

8. The intermediate roll shifting device for an 18-roll mill according to claim 7, characterized in that, The piston rod (11) of the transverse hydraulic cylinder has a T-shaped head at its end. The locking key (12) has a T-shaped groove that matches the T-shaped head. The piston rod (11) of the transverse hydraulic cylinder pulls the locking key (12) through the cooperation of the T-shaped head and the T-shaped groove. The magnetic ring is installed on the outer circumferential surface of the mounting block (8) of the locking key.

9. The intermediate roll shifting device for an 18-roll mill according to claim 7, characterized in that, It also includes a protective cover (6) and / or a proximity switch, the protective cover (6) being placed over the displacement sensor and fixed to the reference base; the proximity switch being mounted on the reference base and configured to detect whether the locking key (12) has reached a preset limit position.

10. The intermediate roll shifting device for an 18-roll mill according to any one of claims 5 to 9, characterized in that, The four transverse drive devices on the upper intermediate roller inlet side, upper intermediate roller outlet side, lower intermediate roller inlet side, and lower intermediate roller outlet side are configured to perform closed-loop synchronous control based on the position signals fed back by their respective position detection devices.

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