Steel coil tail positioning control method of hot rolling coiler

Abstract

The invention belongs to the technical field of steel coil production, and particularly relates to a hot rolling coiler steel coil tail positioning control method. Comprising the following steps that (1) when the tail of a steel coil reaches a tail pressing starting point position, a wrapper roller is controlled to enter a pressure control mode from a waiting position for tail pressing operation; (2) when the speed of the steel coil is reduced to zero and the tail pressing pressure is stabilized in an allowable range, a roll gap value S is obtained through a position sensor of a No.1 wrapper roll, and S is S1 or S2; and (3) the winding drum and the wrapper roll are controlled to rotate forwards at the speed V to drive the steel coil to conduct tail positioning, nodes are recorded according to the value condition of S, the steel coil continues to rotate forwards for T seconds and then stops, and the tail of the steel coil is positioned at the coil unloading safety position in the five o'clock direction of the coiling machine. According to the method, the dynamic change of the roll gap value of the wrapper roll serves as a tail positioning judgment basis for the first time, a traditional indirect detection or pure calculation model is replaced, the physical position of the tail is directly reflected, and the anti-interference performance is high.

Description

Technical Field

[0001] The invention belongs to the technical field of steel coil production, and in particular relates to a method for controlling the tail of a steel coil of a hot rolling coiler. Background Art

[0002] When the tail of the hot rolled steel coil is thrown out from the finishing rolling mill, it will be calculated based on the strip speed and distance so that when the steel coil stops completely in the coiler, the tail will be fixed at about 5 o'clock on the coiler. However, the accuracy of the calculation will be affected by the plate shape of the tail and other issues. Another method is to use the detection instrument in front of the coiler to detect the tail to calculate the fixed position of the tail, but the change of the tail plate temperature will cause detection errors. In this case, it is difficult to fix the tail of the steel coil at about 5 o'clock on the coiler. If it is unloaded, the tail of the steel coil or the equipment and facilities will be scratched, which may cause a coil drop accident. Summary of the invention

[0003] The object of the present invention is to provide a method for controlling the tail of a steel coil of a hot rolling coiler to solve the problems existing in the prior art.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A method for controlling the tail position of a steel coil of a hot rolling coiler comprises the following steps:

[0006] (1) When the tail of the steel coil reaches the tail pressing start point, the auxiliary coil roller is controlled to enter the pressure control mode from the waiting position to perform the tail pressing operation;

[0007] (2) When the coil speed drops to zero and the tail pressure is stable within the allowable range, the roll gap value S is obtained through the position sensor of the No. 1 auxiliary roll, and S takes the value S1 or S2;

[0008] (3) Control the reel and auxiliary reel to rotate forward at a speed of V to drive the steel coil to position the tail, and record the node according to the value of S. Continue to rotate forward for T seconds and then stop. The tail of the steel coil is positioned at the safe unloading position at the 5 o'clock direction of the coiler.

[0009] Furthermore, the tail pressing starting point of step (1) is 5 meters away from the tail of the steel coil to the pinch roller of the coiler.

[0010] Furthermore, step (2) S1 is the roll gap value when the tail of the steel coil stays below the No. 1 auxiliary roll;

[0011] S2 is the roll gap value when the tail of the steel coil does not stay under the No. 1 auxiliary roll;

[0012] And S1=S2+H is satisfied, where H is the thickness of the strip.

[0013] Furthermore, the allowable range of the tail pressure in step (2) is the set value of the tail pressure ±3KN.

[0014] Furthermore, the specific method of recording the node according to the value of S in step (3) is as follows:

[0015] If the initial roll gap value S is S1, when the roll gap value is detected to change from S1 to S2 during the forward rotation, this is recorded as the node where the tail leaves the No. 1 auxiliary roll, and the forward rotation continues for T seconds before stopping;

[0016] If the initial roller gap value S is S2, the roller gap value will first change to S1 during the forward rotation, and then change to S2 again. The node where S1 changes to S2 for the second time is recorded, and the forward rotation continues for T seconds and then stops.

[0017] Furthermore, in step (3), the unloading safety position is located at the 5 o'clock direction of the coiler, the distance between the No. 1 auxiliary winding roller and the unloading safety position is L, and the forward rotation time T is determined by the proportional relationship between the distance L and the speed V, satisfying T=L / V.

[0018] Furthermore, the forward rotation time T=2 seconds, the distance between the No. 1 auxiliary winding roller and the unloading safety position L=2 meters, and the forward rotation speed of the winding drum and the auxiliary winding roller V=1 meter / second.

[0019] The present invention has the following beneficial effects:

[0020] 1. Technological breakthrough: For the first time, the dynamic change of the gap value of the auxiliary winding roller is used as the basis for judging the positioning of the tail, replacing the traditional indirect detection or pure calculation model, directly reflecting the physical position of the tail, and having strong anti-interference ability.

[0021] 2. Logical innovation: By combining the conversion nodes of S1 and S2 with fixed duration control, the uncertainty of the initial position of the tail is accommodated to ensure the uniqueness of the final positioning.

[0022] 3. Engineering value: The mechanical action of the auxiliary roll is deeply coupled with the positioning control, eliminating the need for additional testing equipment and reducing transformation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the positioning method when the tail of the steel coil stays below the No. 1 auxiliary winding roller in Example 1 of the present invention.

[0024] Figure 2 It is a schematic diagram of the positioning method when the tail of the steel coil does not stay under the No. 1 auxiliary winding roller in Example 2 of the present invention.

[0025] Among them: 1. The tail of the steel coil; 2. No. 1 auxiliary coiling roller; 3. The reel. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] Embodiment 1:

[0028] like Figure 1 As shown, a method for controlling the tail position of a steel coil of a hot rolling coiler comprises the following steps:

[0029] (1) When the tail 1 of the steel coil reaches the tail pressing start point (the tail 1 of the steel coil is 5 meters away from the pinch roller of the coiler), the auxiliary winding roller is controlled to enter the pressure control mode from the waiting position to perform the tail pressing operation. The auxiliary winding roller is the prior art, including the No. 1 auxiliary winding roller 2, the No. 2 auxiliary winding roller, and the No. 3 auxiliary winding roller. The No. 1 auxiliary winding roller 2 has been marked in the drawings of the specification, and the specific structure is not repeated here.

[0030] (2) The setting value of the tail pressure is 65 kN. When the coil speed drops to zero and the tail pressure is stabilized within 65 kN ± 3 kN, the roller gap value S is obtained through the position sensor of the No. 1 auxiliary coil roller 2, S = S1 = 655 mm, and the strip thickness H = 5 mm. That is, at this time, the tail 1 of the coil stays below the No. 1 auxiliary coil roller 2.

[0031] (3) The reel 3 and the auxiliary roll are controlled to rotate forward at a speed of V = 1 m / s to drive the steel coil to position the tail. When S is S1 (655 mm), it means that the tail 1 of the steel coil has entered under the No. 1 auxiliary roll 2. When S1 (655 mm) changes to S2 (650 mm), it means that the tail 1 of the steel coil has left the No. 1 auxiliary roll 2. After measuring, the distance between the No. 1 auxiliary roll 2 and the safe unloading position of the coil at the 5 o'clock direction of the coiler is 2 meters. Using the node where S1 (655 mm) changes to S2 (650 mm), the steel coil stops at T = 2 seconds of forward rotation. At this time, the tail stops at the safe unloading position at 5 o'clock.

[0032] Embodiment 2:

[0033] This embodiment provides a method for controlling the tail position of a steel coil of a hot rolling coiler. The method steps are basically the same as those of Embodiment 1, except that:

[0034] like Figure 2 As shown, in step (2), S=S1=650 mm, that is, at this time, the tail 1 of the steel coil does not stay under the No. 1 auxiliary winding roller 2.

[0035] In step (3), when S is S2 (650 mm), it means that the tail 1 of the steel coil has not stopped under the No. 1 auxiliary winding roller 2. During the forward rotation of the steel coil, the tail 1 of the steel coil will definitely enter under the No. 1 auxiliary winding roller 2 and leave under the No. 1 auxiliary winding roller 2 again. That is to say, during the forward rotation, the roller gap value will first change from S2 (650 mm) to S1 (655 mm), and then change to S2 (650 mm) again. The node where S1 changes to S2 for the second time is recorded. After measuring the distance between the No. 1 auxiliary winding roller 2 and the safe unloading position is L = 2 meters, using the node where S1 changes to S2, the steel coil stops at T = 2 seconds during the forward rotation. At this time, the tail stops at the safe unloading position at 5 o'clock.

[0036] The above embodiments are only for describing the preferred implementation of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention should fall within the protection scope of the present invention.

[0037] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A method for controlling the tail position of a hot rolling coiler, characterized in that: The following steps are involved: (1) When the tail of the steel coil reaches the tail pressing start point, the auxiliary coil roller is controlled to enter the pressure control mode from the waiting position to perform the tail pressing operation; (2) When the coil speed drops to zero and the tail pressure is stable within the allowable range, the roll gap value S is obtained through the position sensor of the No. 1 auxiliary roll, and S takes the value S1 or S2; (3) Control the reel and auxiliary reel to rotate forward at a speed of V to drive the steel coil to position the tail, and record the node according to the value of S. Continue to rotate forward for T seconds and then stop. The tail of the steel coil is positioned at the safe unloading position at the 5 o'clock direction of the coiler.

2. The method for controlling the tail position of a hot rolling coiler according to claim 1, characterized in that: The tail pressing starting point in step (1) is 5 meters away from the tail of the steel coil to the pinch roller of the coiler.

3. The method for controlling the tail position of a hot rolling coiler according to claim 1, characterized in that: In step (2), S1 is the roll gap value when the tail of the steel coil stays below the No. 1 auxiliary roll; S2 is the roll gap value when the tail of the steel coil does not stay under the No. 1 auxiliary roll; And S1=S2+H is satisfied, where H is the thickness of the strip.

4. The method for controlling the tail position of a hot rolling coiler according to claim 1, characterized in that: The allowable range of the tail pressure in step (2) is the set value of the tail pressure ±3KN.

5. The method for controlling the tail position of a hot rolling coiler according to claim 1, characterized in that: The specific method of recording nodes according to the value of S in step (3) is: If the initial roll gap value S is S1, when the roll gap value is detected to change from S1 to S2 during the forward rotation, this is recorded as the node where the tail leaves the No. 1 auxiliary roll, and the forward rotation continues for T seconds before stopping; If the initial roller gap value S is S2, the roller gap value will first change to S1 during the forward rotation, and then change to S2 again. The node where S1 changes to S2 for the second time is recorded, and the forward rotation continues for T seconds and then stops.

6. The method for controlling the tail position of a hot rolling coiler according to claim 1, characterized in that: In step (3), the unloading safety position is located at the 5 o'clock direction of the coiler, the distance between the No. 1 auxiliary winding roller and the unloading safety position is L, and the forward rotation time T is determined by the proportional relationship between the distance L and the speed V, satisfying T=L / V.

7. The method for controlling the tail position of a hot rolling coiler according to claim 6, characterized in that: The forward rotation time T=2 seconds, the distance L between the No. 1 auxiliary winding roller and the unloading safety position is 2 meters, and the forward rotation speed V of the winding drum and the auxiliary winding roller is 1 meter / second.

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