CN-116441331-B - Control method of pinch roll at outlet of head-removing roller way

CN116441331BCN 116441331 BCN116441331 BCN 116441331BCN-116441331-B

Abstract

The embodiment of the invention provides a control method of a pinch roll at an outlet of a head-removing roller way, and relates to the technical field of electric automation control. The pinch roll aims to solve the problem that pinch faults are easy to occur due to the fact that the pinch roll cannot be dynamically adjusted according to the size of a rolled piece. The method comprises the steps of obtaining pinch roll idle torque, obtaining pinch roll preset torque, a workpiece head position, a workpiece target position, pinch roll actual torque and pinch roll actual speed Vact, controlling the upper roll to move close to the lower roll in a staged mode according to the workpiece head position, the workpiece target position, the pinch roll actual torque Tact and the pinch roll idle torque T0, and controlling the upper roll to move up and down relative to the lower roll according to the pinch roll actual torque Tact, the pinch roll preset torque Tset, the pinch roll actual speed Vact and the workpiece roll entering speed V0. And continuously correcting the pressing stroke of the upper roller until the preset condition is met, so that the clamping and conveying faults of the rolled piece caused by the dimensional change of the rolled piece can be eliminated.

Inventors

HU ZHANMIN
JIANG HAIJUN
ZHENG BIN
WU XIANHUA
Ye Chaoyuan

Assignees

广东中南钢铁股份有限公司

Dates

Publication Date: 20260508
Application Date: 20230512

Claims (10)

1. The control method of the pinch roll of the outlet of the head-removing roller way comprises an upper roll (100) and a lower roll (200), wherein a channel for conveying rolled pieces is formed between the upper roll (100) and the lower roll (200), and the control method of the pinch roll of the outlet of the head-removing roller way comprises the following steps: Acquiring the roller entering speed V0 of a rolled piece; Acquiring no-load torque T0 of the pinch roll; acquiring a preset torque Tset of a pinch roll; acquiring the head position of a rolled piece; acquiring a target position of a rolled piece; acquiring the actual torque Tact of the pinch roll; acquiring the actual speed Vact of the pinch roll; controlling the upper roll (100) to move close to the lower roll (200) in stages according to the head position of the rolled piece, the target position of the rolled piece, the actual torque Tact of the pinch roll and the idle torque T0 of the pinch roll; And controlling the upper roll (100) to move up and down relative to the lower roll (200) according to the actual pinch roll torque Tact, the preset pinch roll torque Tset, the actual pinch roll speed Vact and the rolled piece feeding speed V0 until preset conditions are reached.
2. The method according to claim 1, wherein the step of controlling the movement of the upper roll (100) closer to the lower roll (200) in stages according to the head position of the rolled piece, the target position of the rolled piece, the actual torque Tact of the pinch roll, and the no-load torque T0 of the pinch roll comprises: Controlling the upper roll (100) to be pressed towards the lower roll (200) at a preset high speed according to the head position of the rolled piece and the target position of the rolled piece; According to the actual torque Tact of the pinch roll and the idle torque T0 of the pinch roll, the upper roll (100) is controlled to be pressed towards the lower roll (200) at a preset low speed; wherein the preset high speed is greater than the preset low speed.
3. The method of controlling the pinch roll out of the de-header roll table according to claim 2, wherein the step of controlling the upper roll (100) to be pressed against the lower roll (200) at a preset high speed according to the head position of the rolled piece and the target position of the rolled piece comprises: If the head position of the rolled piece does not reach the target position of the rolled piece, continuing to acquire the head position of the rolled piece; and if the head position of the rolled piece reaches the target position of the rolled piece, controlling the upper roller (100) to press against the lower roller (200) from the initial position at a preset high speed.
4. A method of controlling a pinch roll-off table outlet pinch roll according to claim 3, wherein the step of controlling the upper roll (100) to be pressed against the lower roll (200) at a preset low speed according to the actual torque Tact of the pinch roll and the no-load torque T0 of the pinch roll comprises: If the actual torque Tact of the pinch roll is larger than the idle torque T0 of the pinch roll, the upper roll (100) is controlled to be pressed towards the lower roll (200) at a preset low speed; and if the actual torque Tact of the pinch roll is smaller than the idle torque T0 of the pinch roll, controlling the upper roll (100) to press against the lower roll (200) at a preset high speed.
5. The method according to claim 4, wherein the step of controlling the upper roll (100) to move up and down with respect to the lower roll (200) according to the pinch roll actual torque Tact, the pinch roll preset torque Tset, the pinch roll actual speed Vact, and the product entry speed V0 until a preset condition is reached comprises: if the actual torque Tact of the pinch roll is equal to the preset torque Tset of the pinch roll, the actual speed Vact of the pinch roll is greater than or equal to the roll feeding speed V0 of the rolled piece, and the adjustment of the upper roll (100) is finished; if the actual pinch roll torque Tact is equal to the preset pinch roll torque Tset, the actual pinch roll speed Vact is smaller than the workpiece feeding speed V0, the upper roll (100) is controlled to move upwards relative to the lower roll (200) until the preset condition is reached, wherein the preset condition is that the actual pinch roll torque Tact is larger than the preset pinch roll torque Tset, and the actual pinch roll speed Vact is larger than or equal to the workpiece feeding speed V0.
6. The method according to claim 5, wherein the step of controlling the upper roll (100) to move up and down with respect to the lower roll (200) according to the pinch roll actual torque Tact, the pinch roll preset torque Tset, the pinch roll actual speed Vact, and the product entry speed V0 until a preset condition is reached further comprises: And if the actual torque Tact of the pinch roll is smaller than the preset torque Tset of the pinch roll and larger than the idle torque T0 of the pinch roll, controlling the upper roll (100) to press against the lower roll (200) at a preset low speed.
7. The method for controlling a pinch roll off-head roll table outlet according to any one of claims 1 to 6, further comprising: and controlling the pinch roll to run at a set running speed Vpr according to the workpiece feeding speed V0, wherein the set running speed Vpr is larger than the workpiece feeding speed V0.
8. The method for controlling an exit pinch roll of a de-header roller way as claimed in claim 7, wherein the calculation formula for the set running speed Vpr comprises Vpr=K V0, vpr is the set running speed, V0 is the roll feeding speed of the rolled piece, K is the advance coefficient of the pinch roll speed, the value range of the advance coefficient of the pinch roll speed K is more than or equal to 1 and less than or equal to 1.1, Is the multiplication number.
9. The method for controlling the pinch roll out of the de-header roller way according to claim 8, wherein the step of obtaining the velocity lead coefficient K of the pinch roll comprises: Obtaining the thickness dimension h of a rolled piece; and obtaining the speed lead coefficient K of the pinch roll according to the thickness dimension h of the rolled piece.
10. The method for controlling the pinch roll off-head roller way outlet according to any one of claims 1 to 6, wherein the step of obtaining the preset torque Tset of the pinch roll comprises: Obtaining the thickness dimension h of a rolled piece; And obtaining the preset torque Tset of the pinch roll according to the thickness dimension h of the rolled piece.

Description

Control method of pinch roll at outlet of head-removing roller way Technical Field The invention relates to the technical field of electric automation control, in particular to a control method of a pinch roll at an outlet of a head-removing roller way. Background A section of head-removing roller way is often arranged between a roughing mill set and a middle mill set of the high-quality steel production line and is used for buffering mismatch of rolling capacities of the roughing mill set and the middle mill set. A pinch roll is arranged on the outlet side of the head-removing roller way (the inlet side of the middle rolling mill set) and used for assisting a rolled piece to bite into the middle rolling mill set, and synchronous matching of the speed of the rolled piece and the speed of the rolling mill when the rolled piece bites into the middle rolling mill set is realized, so that impact damage to rolling mill equipment is reduced. The pinch roll comprises an upper roll and a lower roll, wherein the lower roll is in a fixed position, the upper roll is controlled to lift or press down by a hydraulic oil cylinder, and the pressing down position is adjustable according to the size of a rolled piece. The rotation of the upper roller and the lower roller is driven by a motor with adjustable speed. When the pinch roll is used for clamping the rolled piece, when the head of the rolled piece passes through the gap between the upper roll and the lower roll of the pinch roll, the upper roll of the pinch roll starts to press down, an upper roll oil cylinder executes the pressing down, when the pressing down stroke of the oil cylinder is reached, the upper roll of the pinch roll is locked at the position of the stroke through a hydraulic lock, at the moment, the roll gap between the upper roll and the lower roll of the pinch roll is consistent with the height of the rolled piece, and the rolled piece is clamped by the pinch roll to run. There are generally two methods for realizing the depressing stroke of the cylinder. The first is a mechanical stop block, and the positioning of the oil cylinder is realized through the stop block by adjusting the position of the mechanical stop block. And secondly, according to the height of the rolled piece, the position of the proximity switch is detected by adjusting the position, and the action of the oil cylinder is controlled to realize the pressing positioning. Both of the above methods have problems in that when the size of the rolled product is changed, the pinch rolls cannot perform effective clamping of the rolled product due to the fixed value of the roll gap between the upper and lower rolls of the pinch rolls, or the pinch rolls are overloaded due to excessive clamping. Meanwhile, due to inaccurate control of the pressing positioning action, the roll gap between the upper roll and the lower roll of the pinch roll can be slightly changed, and thus clamping failure or overload failure of the pinch roll can be caused. In practical application, the adjustment of different operators to the position of the positioning stop block or the proximity switch and the control of the size of the rolled piece can influence the use of the pinch roll, bring adverse effects to the production with high rhythm, have large adjustment workload, are easy to cause human errors, have potential safety hazards and are unfavorable for the smooth operation of the production line. Disclosure of Invention The invention aims to provide a control method of a pinch roll at an outlet of a head-removing roller way, which can solve the problem that the pinch roll cannot be dynamically adjusted according to the size of a rolled piece, so that pinch faults are easy to occur. Embodiments of the invention may be implemented as follows: The embodiment of the invention provides a control method of a pinch roll at an outlet of a head-removing roller way, wherein the pinch roll comprises an upper roll and a lower roll, a channel for conveying rolled pieces is formed between the upper roll and the lower roll, and the control method of the pinch roll at the outlet of the head-removing roller way comprises the following steps: Acquiring the roller entering speed V0 of a rolled piece; Acquiring no-load torque T0 of the pinch roll; acquiring a preset torque Tset of a pinch roll; acquiring the head position of a rolled piece; acquiring a target position of a rolled piece; acquiring the actual torque Tact of the pinch roll; acquiring the actual speed Vact of the pinch roll; Controlling the upper roll to move close to the lower roll in stages according to the head position of the rolled piece, the target position of the rolled piece, the actual torque Tact of the pinch roll and the idle torque T0 of the pinch roll; And controlling the upper roll to move up and down relative to the lower roll according to the actual torque Tact of the pinch roll, the preset torque Tset of the pinch roll, the actual speed Vact of the pinc