A control method for preventing steel piling during threading of thin gauge strips at the entrance channel of a continuous annealing line

Abstract

The present invention discloses a control method for preventing steel piling during threading of thin gauge strips at the entrance channel of a continuous annealing line, which includes the following steps: When performing the automatic threading sequence at the entrance channel and the leading end of the strip reaches the sampling guide table at the transverse cutting position, the main line first-level entrance control system starts the automatic threading sequence. The main line first-level entrance control system receives the strip thickness data. After performing automatic identification of the thickness specification, it starts the delay control stroke. According to the automatic identification of the thickness specification and the delay control stroke, the main line first-level entrance control system controls the two-way solenoid valve to be energized and controls the hydraulic cylinder to act; When performing the manual threading sequence at the entrance channel and the leading end of the strip reaches the sampling guide table at the transverse cutting position, the operator adjusts the data on the human-machine interface according to the actual thickness specification of the strip, inputs the thickness specification and the delay time. According to the input thickness specification and the delay time, the main line first-level entrance control system controls the two-way solenoid valve to be energized and controls the hydraulic cylinder to act.

Description

Technical Field

[0001] The present invention belongs to the technical field of continuous annealing lines, and particularly relates to a control method for preventing steel piling during threading of thin-gauge strips at the entrance channel of a continuous annealing line. Background Art

[0002] The control method for preventing steel piling during threading of thin-gauge strips at the entrance channel of a continuous annealing line can significantly reduce the problem of steel piling during threading of thin-gauge strips, providing an important guarantee for the continuous operation of the production line.

[0003] The currently adopted threading mode does not control the guide plate table according to the strip gauge. When strips of all thickness gauges are threaded to the guide plate table, the guide plate table has to be lowered to the low position for the threading sequence to run. This control method is likely to cause steel piling of the strip head on the guide plate during the production of thin-gauge strips, resulting in the interruption of the threading sequence and the shutdown of the unit.

[0004] Therefore, a control method for preventing steel piling during threading of thin-gauge strips at the entrance channel of a continuous annealing line is needed. Summary of the Invention

[0005] The purpose of the present invention is to provide a control method for preventing steel piling during threading of thin-gauge strips at the entrance channel of a continuous annealing line.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a control method for preventing steel piling during threading of thin-gauge strips at the entrance channel of a continuous annealing line, including the following steps:

[0007] 1) During the automatic threading sequence at the entrance channel, when the strip head is threaded to the sampling guide plate table at the transverse shear, the main line first-level entrance control system starts the automatic threading sequence. The main line first-level entrance control system receives the strip thickness data, performs automatic thickness gauge identification, and then starts the delay control stroke. According to the automatic thickness gauge identification and the delay control stroke, the main line first-level entrance control system controls the two-way solenoid valve to be energized and controls the hydraulic cylinder to act.

[0008] 2) During the manual threading sequence at the entrance channel, when the strip head is threaded to the sampling guide plate table at the transverse shear, the operator adjusts the data on the human-machine interface according to the actual thickness gauge of the strip, inputs the thickness gauge and the delay time. According to the input thickness gauge and the delay time, the main line first-level entrance control system controls the two-way solenoid valve to be energized and controls the hydraulic cylinder to act.

[0009] The present invention has the following beneficial effects: When producing strips with a thickness gauge of 0.8 mm or less, precise control of the position of the sampling guide plate table is achieved, effectively avoiding the problem of steel piling at the sampling guide plate table due to the strip gauge after the strip is sheared by the transverse shear, realizing the efficient operation of the threading sequence for thin-gauge strips, and avoiding the shutdown of the unit. Description of the Drawings

[0010] Figure 1 It is a schematic structural diagram of a sampling guide plate table.

[0011] Figure 2 It is a schematic diagram of threading the strip in the entrance channel production line.

[0012] Figure 3 It is a control flow chart of the present invention.

[0013] In the figure: 1 - two-way solenoid valve; 2 - sampling guide plate table; 3 - hydraulic cylinder; 4 - fixed guide plate table; 5 - pinch roll; 6 - flying shear. Specific embodiments

[0014] Now, the present invention will be further described in detail with reference to the accompanying drawings.

[0015] As Figures 1-3 , a control method for preventing the steel coil stacking during threading of thin-gauge strips in the entrance channel of a continuous annealing line is mainly composed of a master-level timing control system. The master-level timing control system of the production line consists of an entrance section control system, an HMI screen input, and a threading timing control.

[0016] In the automatic threading mode, the threading timing control mainly realizes the automatic recognition of the thickness specification during the threading process of thin-gauge strips, and at the same time accurately controls the action time of the hydraulic cylinder of the sampling guide plate table to complete the secondary action of the sampling guide plate table, solving the problem that the sampling guide plate table cannot thread the thin-gauge strip normally at the low position, thereby avoiding the problem of steel coil stacking during the threading of thin materials.

[0017] In the manual threading mode, through the HMI human-machine interface, the operator can manually set the "action time of the sampling guide plate table" and the "strip gauge thickness" in advance according to the actual incoming material situation to adapt to the stroke control of the sampling guide plate table for different thickness specifications. Manually set the "action time of the sampling guide plate table", the time range is 0.2S - 1S, and manually set the "strip gauge thickness", the thickness range is 0.3mm - 0.8mm.

[0018] The present invention aims at the sampling guide plate table 2 after the flying shear 6 in the entrance threading channel of the cold rolling continuous annealing line. The lifting of the sampling guide plate table 2 is realized by controlling the hydraulic cylinder 3 with a two-way solenoid valve 1. On the basis of the original control of the threading timing in the entrance channel, the present invention adds the function of automatic recognition of the strip thickness specification. At the same time, the action stroke of the sampling guide plate table is controlled by an automatic timing program. On the HMI human-machine interface, the operator can also manually set the "action time of the sampling guide plate table" and the "strip gauge thickness" according to the actual production situation to adapt to the stroke control of the sampling guide plate table for different thickness specifications.

[0019] Execute the automatic threading timing in the entrance channel. When the leading end of the strip is threaded to the sampling guide table at the transverse cutting position, the main line first-level entrance control system starts the automatic threading timing. The main line first-level entrance control system receives the strip thickness data. After performing automatic recognition of the thickness specification, it starts the delay control stroke. Based on the automatic recognition of the thickness specification and the delay control stroke, the main line first-level entrance control system controls the two-way solenoid valve to be energized and controls the hydraulic cylinder to actuate.

[0020] Execute the manual threading timing in the entrance channel. When the leading end of the strip is threaded to the sampling guide table at the transverse cutting position, the operator adjusts the data on the human-machine interface according to the actual thickness specification of the strip, inputs the thickness specification and the delay time. Based on the input thickness specification and the delay time, the main line first-level entrance control system controls the two-way solenoid valve to be energized and controls the hydraulic cylinder to actuate.

[0021] The present invention is not limited to the above embodiments. Anyone should know that structural changes made under the inspiration of the present invention, as long as they have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention.

[0022] The technologies, shapes, and structures not detailedly described in the present invention are all well-known technologies.

Claims

1. A control method for preventing thin-gauge strip steel from piling up during threading at the entrance of a continuous annealing line, characterized in that, when producing strip steel with a thickness specification of 0.8 mm or less, precise control of the position of the sampling guide table is achieved, including the following steps: 1) During the automatic threading sequence at the entrance channel, when the leading end of the strip is threaded to the sampling guide table at the transverse cutting position, the main line first-level entrance control system starts the automatic threading sequence. The main line first-level entrance control system receives the strip thickness data, performs automatic thickness specification identification, and then starts the delay control stroke. According to the automatic thickness specification identification and the delay control stroke, the main line first-level entrance control system controls the two-way solenoid valve to be energized and controls the hydraulic cylinder to act; 2) During the manual threading sequence at the entrance channel, when the leading end of the strip is threaded to the sampling guide table at the transverse cutting position, the operator adjusts the data on the human-machine interface according to the actual thickness specification of the strip, inputs the thickness specification and the delay time. According to the input thickness specification and the delay time, the main line first-level entrance control system controls the two-way solenoid valve to be energized and controls the hydraulic cylinder to act. Manually set the "sampling guide table action time", with a time range of 0.2S - 1S, and manually set the "strip steel specification thickness", with a thickness range of 0.3 mm - 0.8 mm.

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