Control method for realizing full-automatic tail fixing of hot coil box

Abstract

The invention discloses a control method for realizing full-automatic tail fixing of a hot coil box, which comprises the following steps of: after a first-stage heat detector 1 # HDM detects the tail part of strip steel, starting to track the tail part of the strip steel, and reducing the coiling speed of the hot coil box; after a falling edge tail tracking value of a first-stage heat detector 1 # HDM at an OFF signal triggering time point and a tail correction value after original logic correction of a second-stage heat detector 2 # HDM at the OFF signal triggering time point are obtained, the difference value between the tail correction value and the tail tracking value is multiplied by an experimental coefficient (1 + alpha), and an accurate correction value is obtained; by conveying the accurate correction value into a program, executing corrected tail tracking and stopping the tail of the strip steel to an ideal position, the method for achieving full-automatic tail fixing by accurately correcting, tracking and calculating errors can effectively avoid uncoiling failure caused by tail fixing errors, and waste steel caused by uncoiling failure is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of hot rolling, and in particular to a control method for realizing full-automatic tail positioning of a hot coil box. Background Art

[0002] Since the research object is a coreless hot coil box, when the slab passes through various rollers of the hot coil box to form a core and during normal coiling, different degrees of natural slippage may occur due to different width, hardness, temperature and other conditions, thereby affecting the deviation between the calculated tracking and the actual position of the slab, and the hardware conditions involved in the tracking correction are relatively few, and the correction accuracy and frequency are low, which ultimately causes the tail fixed position to deviate from the ideal position.

[0003] In the prior art, a technology has been found: according to the need for the final stop position of the tail, a tail positioning method is formed by combining the standard physical distance and the calculated tracking distance with the scanning result of the HMD heat detector. Figure 1 The original logic has a smaller correction value for tail correction, which is mainly based on the integral calculation of the roller speed and the time difference of the OFF signals of the first-level heat detector 1#HDM and the second-level heat detector 2#HDM, and then compared and judged in combination with the actual physical position, thereby providing a correction value for tail tracking. However, this value only considers the correction before the second-level heat detector 2#HDM, and does not consider the natural slippage from the second-level heat detector 2#HDM to the final stop position. Therefore, when the width, hardness, temperature and other conditions change, the original auxiliary tail positioning logic will have a large deviation from the actual object, which will eventually cause the actual tail positioning to fluctuate.

[0004] Therefore, based on the above technical problems, the present application proposes a control method for realizing fully automatic tail positioning of a hot coil box with inaccurate tail positioning and low waste coil rate. Summary of the invention

[0005] The object of the present invention is to overcome the deficiencies of the prior art and to provide a control method for realizing fully automatic tail positioning of a hot coil box with inaccurate tail positioning and low waste coil rate.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a control method for realizing fully automatic tail positioning of a hot coil box, comprising the following steps: The control method comprises the following steps: S1 After the first-level heat detector 1#HDM detects the tail of the strip, the first-level heat detector 1#HDM triggers an OFF signal; The procedure described in S2 causes the first-level heat detector 1#HDM and the second-level heat detector 2#HDM to start tail tracking of the strip; S3: The program controls the hot coil box to reduce the coiling speed; S4 obtains the falling edge tail tracking value of the first-level heat detector 1#HDM at the time point when the OFF signal is triggered; S5 obtains the tail correction value of the secondary heat detector 2#HDM after the original logic correction at the time point of triggering the OFF signal; S6 multiplies the difference between the obtained tail correction value and the tail tracking value by the experimental coefficient (1+α) to obtain an accurate correction value; S7 delivers the precise correction value to the program; After receiving the precise correction value, the S8 program performs the corrected tail tracking and stops the strip tail at the ideal position.

[0007] Furthermore, the first-level heat detector 1#HDM and the second-level heat detector 2#HDM are installed equidistantly above the strip along the strip input direction.

[0008] Furthermore, the automatic tail tracking logic of the hot coil box includes three distances, namely the straight-line distance D1 from the first-level heat detector 1#HDM to the second-level heat detector 2#HDM, the straight-line distance D2 from the second-level heat detector 2#HDM to the lower bending roller, and the arc length distance L from the center of the lower bending roller to the final stop position of the strip.

[0009] Furthermore, the arc length angle α is the angle between the center of the lower bending roller and the final stop position of the strip.

[0010] Furthermore, the coiling speed of the hot coil box is reduced from the maximum speed to 2 m / s.

[0011] The present invention adopts the above-mentioned solution, and its beneficial effects are: Quantitative tail tracking is formed by integrating the trigger signal of the relevant heat detector, the roller speed and other conditions, and the tail tracking values ​​at the falling edge of the first-level heat detector 1#HDM and the time point of the second-level heat detector 2#HDMOFF signal are obtained. The difference is subtracted and multiplied by the experimental coefficient (1+α). The shortcoming of the natural slippage of the second-level heat detector 2#HDM to the final stop position without compensation correction is optimized, thereby solving the problem of inaccurate tail positioning of the hot coil box, reducing the generation of waste coils due to hot coil boxes, and improving regional automation to promote labor efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a flow chart of the existing hot coil box tail control technology.

[0013] Figure 2 Schematic diagram of the process of fully automatic tail setting control of the hot coil box in this embodiment.

[0014] Figure 3 It is a schematic diagram of a function chart of the fully automatic tail setting control of the hot coil box in this embodiment.

[0015] Figure 4 Schematic diagram of the structure of the fully automatic tail setting control of the hot coil box in this embodiment. DETAILED DESCRIPTION

[0016] In order to facilitate the understanding of the present invention, the present invention is described more fully below with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. The purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0017] See attached Figure 2 As shown, in this embodiment, a control method for realizing fully automatic tail positioning of a hot coil box comprises the following steps: The control method comprises the following steps: S1 After the first-level heat detector 1#HDM detects the tail of the strip, the first-level heat detector 1#HDM triggers the OFF signal; The S2 program instructs the first-level heat detector 1#HDM and the second-level heat detector 2#HDM to start tail tracking of the strip; The S3 program controls the hot coil box to reduce the coiling speed from the maximum speed to 2m / s, making it easier for the system to locate and collect the OFF signal, reducing the difficulty of subsequent acquisition of related parameters and providing buffer time for strip control; S4 See Appendix Figure 4 As shown, the falling edge tail tracking value of the first-level heat detector 1#HDM at the time point when the OFF signal is triggered is obtained; S5 See Appendix Figure 4 As shown, the tail correction value of the secondary heat detector 2#HDM after the original logic correction at the time point of triggering the OFF signal is obtained; S6 multiplies the difference between the tail correction value and the tail tracking value by the experimental coefficient (1+α) to obtain the precise correction value. The specific calculation formula is:

[0018] S7 delivers the precise correction value to the program; After receiving the precise correction value, the S8 program performs the corrected tail tracking and stops the strip tail at the ideal position.

[0019] Furthermore, the first-level heat detector 1#HDM and the second-level heat detector 2#HDM are installed equidistantly above the strip along the strip input direction, thereby making it easier for the first-level heat detector 1#HDM and the second-level heat detector 2#HDM to accurately identify the input strip.

[0020] See attached Figure 4As shown, in this embodiment, the automatic tail tracking logic of the hot coil box includes three distances, namely the straight-line distance D1-9.69m from the first-level heat detector 1#HDM to the second-level heat detector 2#HDM, the straight-line distance D2-3.1m from the second-level heat detector 2#HDM to the lower bending roller, and the arc length distance L from the center of the lower bending roller to the final stop position of the strip - the specific size needs to be calculated in conjunction with the actual product.

[0021] See attached Figure 4 As shown, further, the arc length angle α is the angle between the center of the lower bending roller and the final stop position of the strip.

[0022] It should be noted that the specific formula for calculating the arc length angle α and the arc length distance L is:

[0023]

[0024] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any technician familiar with the art who, without departing from the scope of the technical solution of the present invention, uses the above disclosed technical content to make more possible changes and modifications to the technical solution of the present invention, or modifications are all equivalent embodiments of the present invention. Therefore, all equivalent and equivalent changes made according to the ideas of the present invention without departing from the content of the technical solution of the present invention should be covered within the protection scope of the present invention.

Claims

1. A control method for realizing fully automatic tail setting of hot coil box, characterized in that The control method comprises the following steps: S1 After the first-level heat detector 1#HDM detects the tail of the strip, the first-level heat detector 1#HDM triggers an OFF signal; The procedure described in S2 causes the first-level heat detector 1#HDM and the second-level heat detector 2#HDM to start tail tracking of the strip; S3: The program controls the hot coil box to reduce the coiling speed; S4 obtains the falling edge tail tracking value of the first-level heat detector 1#HDM at the time point when the OFF signal is triggered; S5 obtains the tail correction value of the secondary heat detector 2#HDM after the original logic correction at the time point of triggering the OFF signal; S6 multiplies the difference between the obtained tail correction value and the tail tracking value by the experimental coefficient (1+α) to obtain an accurate correction value; S7 delivers the precise correction value to the program; After receiving the precise correction value, the S8 program performs the corrected tail tracking and stops the strip tail at the ideal position.

2. A control method for realizing fully automatic tail positioning of hot coil box according to claim 1, characterized in that: The first-level heat detector 1#HDM and the second-level heat detector 2#HDM are installed equidistantly above the strip along the strip input direction.

3. The control method for realizing fully automatic tail positioning of hot coil box according to claim 1, characterized in that: The automatic tail tracking logic of the hot coil box includes three distances, namely the straight-line distance D1 from the first-level heat detector 1#HDM to the second-level heat detector 2#HDM, the straight-line distance D2 from the second-level heat detector 2#HDM to the lower bending roller, and the arc length distance L from the center of the lower bending roller to the final stop position of the strip.

4. A control method for realizing fully automatic tail positioning of hot coil box according to claim 1, characterized in that: The arc length angle α is the angle between the center of the lower bending roller and the final stop position of the strip.

5. The control method for realizing fully automatic tail positioning of hot coil box according to claim 1 is characterized in that: The coiling speed of the hot coil box is reduced from the maximum speed to 2m / s.

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