A method for pressure balancing in an automatic control winding machine positioning system

Abstract

This invention relates to the field of hot-rolled strip steel production technology, and more particularly to a method for pressure balancing in an automatic control coiler positioning system. The method includes: after the strip enters the finishing mill, the coiler guide rails perform a final setting of the opening degree; the strip enters the guide rail control area; both guide rails apply short-stroke clamping; after the position control side reaches its position, the position setting remains unchanged, and the strip is clamped using position control; after the pressure control side reaches its position, the pressure setting remains unchanged, and the strip is clamped using pressure control; the force on the guide rail body exceeds the adjustment start control point a×F. 极限 The safety factor α is set to 0.85 to 0.95. The pressure setting on the pressure control side is reduced according to the deviation ratio, and the lateral position fluctuation of the strip in the guide ruler area is controlled within 5 to 10 mm. The initial point for pressure adjustment is set, and the adjustment limit on the pressure control side is set. This invention enables the strip to enter the coiler stably, resulting in good coil quality, reduced scrap and excess material, and improved yield.

Description

Technical Field

[0001] This invention relates to the field of hot-rolled strip steel production technology, and in particular to a method for pressure balancing of an automatic control coiler positioning system. Background Technology

[0002] With the continuous development of hot-rolled strip steel production technology and the increasing variety of specifications and materials, the application of thick and hard strip steel is becoming more and more widespread. The requirements for its performance and coil quality are also getting higher and higher. In order to ensure the coil quality of thick and hard steel coils, the pressure setting of the guide ruler of the coiler is also increasing. Generally, during the production process of the coiler, when clamping the steel plate, one side of the guide ruler on the roller table is kept in a fixed position, while the other side is controlled by pressure to clamp the steel plate so that the strip steel can pass smoothly through the guide ruler area.

[0003] When producing thick-gauge high-strength steel, in order to maintain the overall stability of the guide ruler's position and improve the coil shape quality, the guide ruler pressure is set to be particularly high, applying excessive pressure to the steel plate. This results in defects such as warping and poor wedge shape in the steel plate. As the steel plate passes through the pinch rollers, it generates a lateral pushing force. The combined force of the active pushing force on the pressure control side and this lateral force pushes the guide ruler on the position control side away. Even if the servo valve is opened to its limit, it cannot prevent this passive change in position. As a result, the steel plate does not enter the coiler in a straight line, resulting in poor coiling and thus causing scrap or reduced-price material. Summary of the Invention

[0004] This invention provides a method for automatically controlling the pressure balance of the coiler positioning system, ensuring that the coiler guide rail maintains a relatively stable position during the strip clamping process. This overcomes the shortcomings of the prior art by judging the working state of the guide rail on the strip clamping position control side and adjusting the pressure setting on the pressure control side by changing the position control side. This achieves stable control of the strip's forward direction, improves the coil shape quality of hot-rolled strip, reduces scrap and excess material, and increases the yield.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] A method for automatically controlling the pressure balance of a winding machine positioning system includes the following steps:

[0007] S1. After the strip enters the finishing mill, the opening degree is finally set by the guide scale of the coiler.

[0008] S2. When the strip enters the guide ruler control area, the double-sided guide rulers perform short-stroke clamping, that is, when the head of the strip smoothly enters the middle section of the guide ruler, the additional guide ruler width margin is clamped back.

[0009] S3. After the short-stroke control on the position control side is completed and the position setting remains unchanged, the strip is clamped by position control.

[0010] S4. After the short-stroke control on the pressure control side is completed, maintain the pressure control mode to clamp the strip.

[0011] S5. When the force on the guide ruler body of the position control side exceeds the adjustment start control point a×F 极限 'a' is the safety factor, ranging from 0.85 to 0.95; F 极限 To ensure the maximum pressure that the position control side can withstand while remaining stationary, the pressure setting of the pressure control side is reduced according to the deviation ratio, so that the lateral position fluctuation of the strip in the guide ruler area is controlled within 5-10 mm.

[0012] S6. Set the initial point for pressure adjustment startup;

[0013] S7. Set the adjustment limits for the pressure control side.

[0014] Furthermore, the strip entering the guide ruler control area refers to the strip head entering the guide ruler area. After the short stroke control of the guide rulers on both sides of the coiler is completed, the position control side always maintains the position control mode.

[0015] Furthermore, the pressure on the position control side reaches a safety factor a×F. 极限 Initiate adjustment, set the position control side pressure control range to a×F 极限 ~F 极限 The pressure is adjusted in real time by performing a linear function calculation within the pressure setting range F0 to 0 on the corresponding pressure control side.

[0016] Furthermore, the final pressure of the guide ruler on the pressure control side is set as follows: when F 位置 -aF 极限 When adjustment is initiated at >0, F = F0 × (F 位置 -F 极限 ) / (a×F 极限 -F 极限 When F 位置 -aF 极限 ≤0, meaning that when the force on the position control side is within the safe range, F = F0, and no adjustment is needed; where F 位置 F0 is the actual pressure feedback on the position control side; F0 is the initial pressure setting of the guide gauge on the pressure control side, and F is the actual pressure setting of the guide gauge on the pressure control side.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] To ensure that the guide ruler of the coiler remains relatively stable in position during the strip clamping process, this technology overcomes the shortcomings of existing technologies. It judges the working status of the guide ruler on the strip clamping position control side, and adjusts the pressure setting on the pressure control side by changing the position control side. This achieves stable control of the strip's forward direction and automatically controls the system's pressure balance after the coiler guide ruler is in place. The strip can stably enter the coiler for production, improving the coil shape quality of hot-rolled strip, reducing scrap and excess material, and increasing the yield. Detailed Implementation

[0019] The specific embodiments of the present invention will be further described below:

[0020] This invention discloses a method for automatically controlling the pressure balance of a winding machine positioning system, comprising the following steps:

[0021] S1. After the strip enters the finishing mill, the opening degree of the coiler guide is set. In order to accommodate the strip with an offset center line to smoothly enter the guide area, we add 60mm, 80mm and 80mm to the guides of coilers #1, #2 and #3 respectively to form the final opening degree setting based on the strip width set at the second level.

[0022] S2. The strip enters the guide ruler control area, that is, the head of the strip enters the guide ruler area. After the short stroke control of the guide rulers on both sides of the coiler is completed, the position control side always maintains the position control mode. The guide rulers on both sides perform short stroke clamping. When the head of the strip smoothly enters the middle section of the guide ruler, in order to reduce the quality defects of the coil head, the additional guide ruler width margin is clamped back. This method is called short stroke control. This additional margin can be added to the guide ruler on one side for control, or it can be divided equally and added to both sides for control. In order to reduce the action time and improve the coil shape quality, we adopt a dual-side short stroke control scheme. Taking the No. 1 coiler as an example, the total additional value of 60mm is added to 30mm on each side. When the short stroke control is executed, 30mm is clamped on each side. After the short stroke is completed, one side is kept stationary by position control, and the other side is actively clamped by pressure control. This allows the strip to continuously maintain a straight state when entering the coiler.

[0023] S3. After the short-stroke control on the position control side is completed and in place, the position setting remains unchanged, and the strip is clamped in the position control mode.

[0024] S4. After the short-stroke control on the pressure control side is completed and in place, maintain the control mode to clamp the strip.

[0025] S5. When the force on the position control side guide ruler body exceeds the adjustment start control point aF 极限 Set a safety factor 'a', where 'a' is 0.9, and F 极限To ensure the maximum pressure that the position control side can withstand while remaining stationary, the pressure setting of the pressure control side is reduced according to the deviation ratio. Since the current steel coil tower shape index is 50mm, we set a target of 5mm as the limit. If this target is exceeded, the pressure setting adjustment range of the pressure control side can be increased to control the lateral position fluctuation of the strip in the guide area to 5mm.

[0026] When the short-stroke control of the coiler guide scale ends, the pressure control side maintains the pressure setting. This initial pressure setting is recorded as F0, and the actual pressure setting is recorded as F. The position control side remains stationary, and the pressure exerted by the steel plate is recorded as F. 位置 Its ultimate stress is denoted as F. 极限 When F 位置 >F 极限 The position control side was passively pushed open.

[0027] S6. When the position control side feedback pressure reaches a×F 极限 At that time, initiate adjustment and set the pressure control range on the position control side to a×F. 极限 ~F 极限 The pressure setting range F0 to 0 on the corresponding pressure control side is calculated using a linear function. When the pressure feedback value on the position control side reaches a×F... 极限 The pressure on the corresponding pressure control side is set to the initial value F0, and when the pressure feedback value on the position control side reaches F... 极限 Then the pressure on the corresponding pressure control side is set to 0, and the pressure feedback value on the position control side is in the range of a×F. 极限 and F 极限 In between, we use a linear function correspondence to determine the pressure setpoint on the pressure control side and adjust the pressure in real time.

[0028] S7. The final pressure setting of the guide ruler on the pressure control side is: when F 位置 -aF 极限 When adjustment is initiated at >0, F = F0 × (F 位置 -F 极限 ) / (a×F 极限 -F 极限 When F 位置 -aF 极限 ≤0, meaning that when the force on the position control side is within the safe range, F = F0, and no adjustment is needed; where F 极限 Based on actual calculations, the maximum pressure that the position control side can withstand to remain stationary was determined to be 13 tons. 位置 F0 is the actual pressure feedback on the position control side; F0 is the initial pressure setting of the guide gauge on the pressure control side, and F is the actual pressure setting of the guide gauge on the pressure control side.

[0029] S8. The guide ruler requires 0.7 tons of pressure to overcome resistance during normal operation. This pressure is the limit of F adjustment, that is, the actual minimum value of F for pressure control is 0.7 tons.

[0030] The above embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the above embodiments. Unless otherwise specified, the methods used in the above embodiments are conventional methods.

Claims

1. A method for automatically controlling the pressure balance of a winding machine positioning system, characterized in that, Includes the following steps: S1. After the strip enters the finishing mill, the opening degree is finally set by the guide scale of the coiler. S2. When the strip enters the guide ruler control area, the double-sided guide rulers perform short-stroke clamping, that is, when the head of the strip smoothly enters the middle section of the guide ruler, the additional guide ruler width margin is clamped back. S3. After the short-stroke control on the position control side is completed and the position setting remains unchanged, the strip is clamped by position control. S4. After the short-stroke control on the pressure control side is completed, maintain the pressure control mode to clamp the strip. S5. When the force on the guide ruler body of the position control side exceeds the adjustment start control point a×F 极限 'a' is the safety factor, ranging from 0.85 to 0.95; F 极限 To ensure the maximum pressure that the position control side can withstand while remaining stationary, the pressure setting of the pressure control side is reduced according to the deviation ratio, so that the lateral position fluctuation of the strip in the guide ruler area is controlled within 5-10 mm. S6. Set the initial point for pressure adjustment startup; The pressure on the position control side reaches a safety factor a×F 极限 Start adjustment, set the position control side pressure control range to a*F 极限 ~F 极限 The pressure control side pressure setting range F0~0 is correspondingly calculated using a linear function, and the pressure is adjusted in real time. S7. Set the adjustment limits for the pressure control side: The final pressure setting of the guide ruler on the pressure control side is: when F 位置 -aF 极限 When adjustment is initiated at >0, F = F0 × (F 位置 -F 极限 ) / (a×F 极限 -F 极限 When F 位置 -aF 极限 ≤0, meaning that when the force on the position control side is within the safe range, F=F0, and no adjustment is needed; where F 位置 F0 is the actual pressure feedback on the position control side; F0 is the initial pressure setting of the guide gauge on the pressure control side, and F is the actual pressure setting of the guide gauge on the pressure control side.

2. The method for pressure balancing in an automatic control winding machine positioning system according to claim 1, characterized in that, The strip enters the guide ruler control area when the strip head enters the guide ruler area. After the short stroke control of the guide rulers on both sides of the coiler is completed, the position control side always maintains the position control mode.