Intermediate roll on-line stringer device and method

Abstract

The present application belongs to the technical field of strip rolling, and particularly relates to an intermediate roll on-line stringing device and method. The device comprises a stringing oil cylinder, a stringing support, an intermediate roll and a telescopic transmission shaft. The stringing oil cylinder is installed on the stringing support and used to drive the intermediate roll to move axially. The transmission shaft connects the intermediate roll with the output shaft of the speed reducer of the six-roll rolling mill to transmit torque. The method comprises the following steps: switching the six-roll rolling mill to a dynamic variable-gauge rolling mode, adjusting the rolling speed, rolling force, tension and bending force to initial values respectively; calculating the stringing displacement of the intermediate roll according to the widths of the front and rear strips, and controlling the stringing oil cylinder to drive the intermediate roll to move axially at a set speed; when the intermediate roll moves to the set position, controlling the stringing oil cylinder to stop driving the intermediate roll; and switching the six-roll rolling mill to a normal rolling mode, and adjusting the rolling speed, rolling force, tension and bending force to set values respectively. The intermediate roll can be on-line stringed without stopping operation, and the production efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of strip rolling technology, specifically relating to an online intermediate roll setting device and method. Background Technology

[0002] UCM rolling mills (a type of six-roll rolling mill) typically have an intermediate roll reversal function, where the upper and lower intermediate rolls can move in opposite directions along the axial direction. Its working principle is as follows: during the rolling process, based on changes in strip width, the amount of reversal between the upper and lower intermediate rolls is adjusted to eliminate harmful contact between the work rolls and support rolls, reduce the elastic deflection of the work rolls, and combine the bending functions of the work rolls and intermediate rolls to achieve control over various strip shape defects.

[0003] Conventional UCM rolling mills use work roll drive, and the intermediate rolls can be pre-set or serged online. Pre-set serging means that when the mill is stopped and the roll gap is fully open, the intermediate rolls are pre-positioned to a predetermined location, and then the roll gap is closed for rolling once the conditions are met. This is generally suitable for single-stand reversible mills. For continuous rolling mills, to improve production efficiency, dynamic variable-specification continuous rolling is required. This means that while the mill is running and the roll gap is closed, parameters such as roll gap, speed, tension, bending force, and intermediate roll serging amount are dynamically adjusted to change the steel grade, thickness, width, and other specifications of adjacent strip coils. This requires the intermediate rolls to be capable of online serging.

[0004] For materials such as medium and high grade silicon steel, stainless steel, and high strength steel, small-diameter work rolls are usually used to achieve thin strip rolling. The typical work roll diameter is below φ230mm. However, the drive shaft of a small-diameter six-roll mill is difficult to meet the requirements for transmitting rolling torque, and generally only intermediate roll drive can be used. The above-mentioned conventional UCM mill is no longer applicable.

[0005] Domestically known UCM rolling mills that use intermediate roll drives have limited equipment functionality, meaning the intermediate rolls do not have online roll-changing capabilities. They can only be pre-set during roll changes when the machine is stopped, which is not conducive to shape control and improving production efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide an online intermediate roll setting device and method, which enables online adjustment of the intermediate roll setting amount during dynamic variable specification rolling, especially when the strip width changes, thereby significantly improving the strip shape control capability and production efficiency. It is particularly suitable for continuous rolling mills based on small-diameter six-roll mills and can be widely used in the rolling of silicon steel, stainless steel, and high-strength steel.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An online intermediate roll setting device includes a roll setting cylinder, a roll setting support, an intermediate roll, and a retractable drive shaft. The roll setting cylinder is mounted on the roll setting support and is used to drive the intermediate roll to move axially. The intermediate roll is connected to the first end of the drive shaft, and the second end of the drive shaft is used to connect to the output shaft of the reducer of a six-roll mill. The drive shaft is used to transmit torque.

[0009] Preferably, the drive shaft includes a roll-side sleeve, an intermediate shaft, and a reducer-side sleeve in sequence from the first end to the second end. The intermediate shaft is a telescopic structure. The roll-side sleeve and the reducer-side sleeve are respectively connected to both ends of the intermediate shaft. The reducer-side sleeve is used to connect to the reducer output shaft of the six-roll mill. The roll-side sleeve is connected to the intermediate roll.

[0010] Preferably, the intermediate shaft includes a roller side shaft, a reducer side shaft, and a spring assembly. The roller side shaft is connected to the roller side sleeve through a drum-shaped tooth structure, the reducer side shaft is connected to the reducer side sleeve through a drum-shaped tooth structure, the roller side shaft and the reducer side shaft are connected by a spline, the roller side shaft can move axially relative to the reducer side shaft, and the spring assembly is located between the roller side shaft and the reducer side shaft and is compressed by the roller side shaft and the reducer side shaft.

[0011] Preferably, the roller side sleeve is provided with an annular groove in the circumference, the roller cylinder has a piston rod, a pull rod is mounted on the piston rod, the first end of the pull rod is connected to the piston rod of the roller cylinder, and the second end of the pull rod is located in the annular groove. The pull rod is used to prevent the drive shaft from disengaging from the intermediate roller.

[0012] Preferably, there is a gap between the second end of the pull rod and both the bottom and wall of the annular groove.

[0013] Preferably, the roller cylinder has a piston rod, on which a photoelectric switch is mounted. The photoelectric switch is used to detect the position of the roller side sleeve.

[0014] Preferably, the roller cylinder is equipped with a displacement sensor, which is used to detect the displacement of the rollers.

[0015] Preferably, the roller cylinder has a rod chamber and a rodless chamber, and both the rod chamber and the rodless chamber are equipped with pressure sensors, which are used to detect the oil pressure during roller connection.

[0016] Preferably, the roller cylinder is controlled by a proportional hydraulic valve to control the roller speed, and the preset roller speed N is greater than the roller speed M when rollers are connected online.

[0017] An online intermediate roll setting method for a six-high mill, the method comprising the above-described online intermediate roll setting device, the method comprising:

[0018] S1, switch the six-roll mill to dynamic variable specification rolling mode, and adjust the rolling speed, rolling force, tension, and bending force to their initial values ​​V0, P0, T0, and F0 respectively;

[0019] S2, calculate the displacement L of the connecting rollers based on the width of the front and rear strips, and control the connecting roller cylinder to drive the intermediate roller to move axially at the connecting roller speed M.

[0020] S3, when the intermediate rollers move to the roller displacement L, control the roller cylinder to stop driving the intermediate rollers;

[0021] S4. Switch the six-roll mill to normal rolling mode, and adjust the rolling speed, rolling force, tension, and bending force to the set values ​​V1, P1, T1, and F1, respectively.

[0022] Beneficial technical effects of the present invention:

[0023] The online intermediate roll reeling device provided by this invention allows for online reeling of intermediate rolls during dynamic variable specification rolling, especially when the strip width changes, without requiring machine shutdown. This significantly improves the strip shape control effect and further enhances production efficiency. Attached Figure Description

[0024] Figure 1 This is a front view of the online intermediate roller connection device in Embodiment 1;

[0025] Figure 2 This is a top view of the online intermediate roller connection device in Embodiment 1. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1:

[0028] Figure 1 This is a front view of the online roller relay device in this embodiment. Figure 2 This is a top view of the online roller relay device in this embodiment, showing the internal structure of the device. Figure 2 Partial sections were cut out.

[0029] In this embodiment, as Figure 1 and 2 As shown, the online intermediate roll setting device for a six-roll mill provided by the present invention includes a roll setting cylinder 1, a roll setting support 2, a bending roll block 3, and a roll setting beam 4. The roll setting support 2 is located on the transmission side of the mill, and the roll setting cylinder 1 is installed on the roll setting support 2. The upper and lower intermediate rolls 5 are each driven axially by two roll setting cylinders 1.

[0030] The six-roll mill uses intermediate roll 5 for drive. The upper and lower intermediate rolls 5 are each driven by a telescopic drive shaft 6. The drive shaft 6 includes a roll side sleeve 6-1, a reducer side sleeve 6-2, and an intermediate shaft 6-3. The reducer side sleeve 6-2 is connected to the output shaft of the mill reducer, and the roll side sleeve 6-1 is connected to the flat end of the intermediate roll 5.

[0031] The intermediate shaft 6-3 is a telescopic structure, including a roller side shaft connected to the roller side sleeve 6-1 and a reducer side shaft connected to the reducer side sleeve 6-2. The roller side shaft is connected to the roller side sleeve 6-1 and the reducer side shaft is connected to the reducer side sleeve 6-2 respectively through a drum-shaped tooth structure. The roller side shaft and the reducer side shaft are connected by a spline. The roller side shaft can move axially relative to the reducer side shaft.

[0032] Inside the intermediate shaft 6-3, between the roller side shaft and the reducer side shaft, a high-load-bearing spring assembly 6-4 is provided to ensure that the intermediate shaft 6-3 can freely extend and retract axially. The spring assembly 6-4 is always compressed by the roller side shaft and the reducer side shaft, so that the inner end face of the roller side sleeve 6-1 remains in contact with the flat head of the intermediate roller 5.

[0033] When the intermediate roller 5 moves axially, the roller side shaft moves synchronously. Specifically, when the intermediate roller 5 moves toward the transmission side under the drive of the roller cylinder 1, the spring assembly 6-4 is further compressed, and the roller side shaft of the intermediate shaft 6-3 moves synchronously toward the transmission side; when the intermediate roller 5 moves toward the operating side under the drive of the roller cylinder 1, the spring assembly 6-4 releases part of its elastic potential energy, pushing the roller side shaft of the intermediate shaft 6-3 to move synchronously toward the operating side.

[0034] In other embodiments, the structure of the retractable drive shaft 6 may differ from that of this embodiment. For example, the spring assembly 6-4 may be replaced with other elastic mechanisms, or the intermediate shaft 6-3 may adopt other retractable structures.

[0035] The roller cylinder 1 is equipped with a displacement sensor 7 for real-time detection of roller displacement. The rod-side and rodless sides of the roller cylinder 1 are also equipped with pressure sensors to detect the oil pressure during roller connection, thereby achieving overpressure protection.

[0036] The speed of the roller cascading cylinder 1 is controlled by a proportional hydraulic valve. When the roller cascading is preset or the rolls are being replaced, the roll gap is fully opened. The proportional hydraulic valve controls the roller cascading cylinder 1 to drive the intermediate roll 5 to cascade at a set speed N. When the rollers are cascading online, in order to avoid scratching the roll surface and damaging the equipment, the proportional hydraulic valve controls the roller cascading cylinder 1 to drive the intermediate roll 5 to cascade at a set speed M.

[0037] Each intermediate roller 5 has a pair of photoelectric switches 8 horizontally mounted on the piston rod head of the two roller cylinders 1. The axis of the photoelectric switch 8 is perpendicular to the axis of the drive shaft 6. The photoelectric switch 8 is used to detect the safe position of the roller side sleeve 6-1 of the drive shaft 6.

[0038] In other embodiments, the detection of roller displacement, hydraulic pressure, speed, and the position of the roller side sleeve 6-1 can all be achieved using other methods.

[0039] Each of the two roller cylinders 1 of the intermediate roller 5 is also equipped with a pull rod 9 at the piston rod head. The first end of the pull rod 9 is connected to the piston rod of the roller cylinder 1, and the second end of the pull rod 9 extends into the circumferential annular groove of the roller side sleeve 6-1 of the drive shaft 6. The second end of the pull rod 9 maintains a certain safety clearance with the groove wall and the bottom of the annular groove so that the drive shaft 6 will not contact the pull rod 9 during rotation.

[0040] When the intermediate roller 5 is in normal online operation, the tie rod 9 and the roller-side sleeve 6-1 of the drive shaft 6 move synchronously with the intermediate roller 5. In abnormal situations, such as spline jamming of the drive shaft 6 or failure of the spring assembly 6-4, the roller-side sleeve 6-1 may fail to move synchronously with the intermediate roller 5. In such cases, the tie rod 9 will hook onto the annular groove of the roller-side sleeve 6-1 to prevent the drive shaft 6 from disengaging from the intermediate roller 5 during rotation and causing a production accident.

[0041] Example 2:

[0042] This embodiment provides a method for online intermediate roll connection, which can be implemented by a six-roll mill containing the online intermediate roll connection device provided in Embodiment 1.

[0043] The online intermediate roll connection method includes the following steps:

[0044] S1, switch the six-roll mill to dynamic variable specification rolling mode, and adjust the rolling speed, rolling force, tension, and bending force to their initial values ​​V0, P0, T0, and F0 respectively;

[0045] S2, calculate the displacement L of the rollers based on the width of the front and rear strips, and control the roller cylinder 1 to drive the intermediate roller 5 to move axially at the roller speed M.

[0046] S3, Displacement sensor 7 detects the displacement of the rollers in real time. When the intermediate roller 5 moves to the roller displacement L, the roller cylinder 1 stops driving the intermediate roller 5, and the six-roll mill gives a roller completion signal.

[0047] S4, switch the six-roll mill to normal rolling mode, and adjust the rolling speed, rolling force, tension, and bending force to the set values ​​V1, P1, T1, and F1 respectively;

[0048] In this embodiment, during the intermediate roll 5-roll connection process, the above-mentioned online intermediate roll connection method further includes the following steps:

[0049] S5, the oil cylinder 1 of the roller cascade cylinder detects the oil pressure in the rod chamber and the rodless chamber in real time. If the roller cascade resistance of the intermediate roller 5 is too large and the oil pressure exceeds the preset pressure P, the six-roll mill will give an overpressure alarm signal and stop the roller cascade.

[0050] S6, photoelectric switch 8 detects in real time whether the roll side sleeve 6-1 of the drive shaft 6 is in a safe position. If there is an abnormality such as spline jamming of the drive shaft 6 or failure of the spring group 6-4, and the drive shaft 6 fails to move synchronously with the intermediate roll 5, the photoelectric switch 8 signal will change, the six-roll mill will give a drive shaft fault alarm signal and stop the roll connection.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. It should be noted that any modifications, equivalent substitutions, or improvements made by those skilled in the art within the spirit and principles of the present invention after reading this specification should be included within the scope of protection of the present invention.

Claims

1. An online intermediate roll setting device for a six-roll mill, characterized in that: It includes a roller cylinder, a roller support, an intermediate roller, and a telescopic drive shaft. The roller cylinder is mounted on the roller support and is used to drive the intermediate roller to move axially. The intermediate roller is connected to the first end of the drive shaft, and the second end of the drive shaft is used to connect to the output shaft of the reducer of the six-roll mill. The drive shaft is used to transmit torque. The drive shaft includes, from the first end to the second end, a roll side sleeve, an intermediate shaft, and a reducer side sleeve. The intermediate shaft is a telescopic structure. The roll side sleeve and the reducer side sleeve are respectively connected to both ends of the intermediate shaft. The reducer side sleeve is used to connect to the reducer output shaft of the six-roll mill. The roll side sleeve is connected to the intermediate roll. The intermediate shaft includes a roller side shaft, a reducer side shaft, and a spring assembly. The roller side shaft is connected to the roller side sleeve through a drum-shaped tooth structure, the reducer side shaft is connected to the reducer side sleeve through a drum-shaped tooth structure, and the roller side shaft is connected to the reducer side shaft through a spline. The roller side shaft can move axially relative to the reducer side shaft. The spring assembly is located between the roller side shaft and the reducer side shaft and is compressed by the roller side shaft and the reducer side shaft.

2. The online intermediate roll setting device as described in claim 1, characterized in that: The roller side sleeve is provided with an annular groove in the circumference. The roller cylinder has a piston rod, and a pull rod is installed on the piston rod. The first end of the pull rod is connected to the piston rod of the roller cylinder, and the second end of the pull rod is located in the annular groove. The pull rod is used to prevent the drive shaft from disengaging from the intermediate roller.

3. The online intermediate roll setting device as described in claim 2, characterized in that: There are gaps between the second end of the pull rod and the bottom and wall of the annular groove.

4. The online intermediate roll setting device as described in claim 1, characterized in that: The roller cylinder has a piston rod, on which a photoelectric switch is mounted. The photoelectric switch is used to detect the position of the roller side sleeve.

5. The online intermediate roll setting device as described in claim 1, characterized in that: The roller cylinder is equipped with a displacement sensor, which is used to detect the displacement of the rollers.

6. The online intermediate roll setting device as described in claim 1, characterized in that: The roller cylinder has a rod chamber and a rodless chamber, and both the rod chamber and the rodless chamber are equipped with pressure sensors, which are used to detect the oil pressure during roller connection.

7. The online intermediate roll setting device as described in claim 1, characterized in that: The speed of the rollers is controlled by a proportional hydraulic valve. The preset roller speed N is greater than the roller speed M when rollers are connected online.

8. A method for online intermediate roll configuration, the method being used in a six-high mill, the six-high mill comprising the online intermediate roll configuration device as described in any one of claims 1 to 6, characterized in that, The method includes: S1, switch the six-roll mill to dynamic variable specification rolling mode, and adjust the rolling speed, rolling force, tension, and bending force to their initial values ​​V0, P0, T0, and F0 respectively; S2, calculate the displacement L of the connecting rollers based on the width of the front and rear strips, and control the connecting roller cylinder to drive the intermediate roller to move axially at the connecting roller speed M. S3, when the intermediate rollers move to the roller displacement L, control the roller cylinder to stop driving the intermediate rollers; S4. Switch the six-roll mill to normal rolling mode, and adjust the rolling speed, rolling force, tension, and bending force to the set values ​​V1, P1, T1, and F1, respectively.

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