JPH07328718A - Steel plate speed detection method for winding equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the detection accuracy of the steel plate speed that is constantly detected from the finishing stand. [Structure] Two tracking devices 4 and 5 are installed in the side guide of the winder in the sheet passing direction of the steel plate, and the time (time t2-t1) at which the tip of the steel plate moves the distance S between them is measured. The velocity V _TR is calculated by the following formula, and the deviation Δ from the steel plate velocity V _{F (t2)} at the time t2 detected by the finishing final stand 3
V = V _TR −V _{F (t2)} is calculated, and the steel plate speed at an arbitrary time point thereafter is calculated as V _{F (t)} ′ = V _{F (t)} + ΔV. V
_{F (t)} is a steel plate speed detected by the finishing final stand 3 at an arbitrary time point after the time t2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting the speed of a hot rolled steel sheet at the front of the winder.

[0002]

2. Description of the Related Art In the production of steel sheets in the hot rolling process,
A steel sheet winding machine is arranged at the final end, and its role is to wind the steel sheet rolled by the rolling machine tightly at high speed and in a good winding shape. In particular, the latter is the largest factor of the yield reduction due to the edge breakage that occurs when the coil is conveyed in the defective winding shape state, and therefore improvement thereof is desired.

In order to obtain a good coil winding shape, after the finish rolling, the leading edge of the steel sheet that has run away from the center of the mill is run at the optimum timing centering on the winder, and
Need to guide quickly.

As a means for guiding the steel sheet to the center of the mill, a side guide device is installed in front of the winder pinch roll. In order to prevent the front end of the steel plate from being caught in this side guide, the opening is set in advance to a width of several tens to 100 mm wider than the plate width, and the plate width is set quickly after the front end of the steel plate has passed. A short stroke mechanism is installed.

The start timing of narrowing the side guide opening to the plate width of this short stroke mechanism is the distance timer value (finishing) measured at the finishing stand from the timing of recognizing the tip of the steel plate by the tracking device installed on the side guide. It is the time when the value of the feeding distance of the front end of the steel plate from the final stand) becomes equal to the distance between the tracking device and the optimum starting position of the short stroke mechanism.

This distance timer measures the moving distance of the tip of the steel plate during traveling. The distance timer value is S, the sampling interval (time axis) of the steel plate speed is Δt _i , and the steel plate speed at each sampling is V _i. (= Calculation from final finishing work roll peripheral speed × advancement rate) S = Σ (V _i × Δt _i ) (1) S: distance timer value Δt _i : interval V _i : at each sampling interval It can be expressed by the steel plate speed.

As a method for continuously detecting the steel plate speed for measuring the distance timer value, there is a laser Doppler velocimeter used in a cold rolling factory or the like. However, in a hot rolling factory in a high temperature steam atmosphere, the speed of the steel sheet is detected. The detection accuracy is low and there is a problem in maintenance. Therefore, the method for continuously detecting the steel plate speed in a hot rolling plant is generally performed by a rotating body such as a roll. In the case of this side guide short stroke mechanism, the finishing final work roll peripheral speed is used, and a method of using the pinch roll peripheral speed for detecting the tip position of the steel plate in the wrapper roll step avoidance control is disclosed in It is disclosed in Japanese Laid-Open Patent Publication No. 57-22820.

[0008]

However, all of these methods have errors in the advance rate and roll slip of the rolling stand, and it is difficult to obtain a highly accurate detected value. Referring to FIG. 2, the winding side guide 1
Finishing stand 3 detected from the passage timing of the steel plate tip recognized by the tracking device 2 installed in the
When the distance timer value S becomes equal to the distance S ′ between the tracking device and the side guide short stroke start optimum position, that is, when S = S ′ (2), the actual short stroke drive ( Setting of narrowing the side guide opening to the plate width) starts. However, the steel plate speed V _{F (t)} (= V _i ) in the final finishing stand has an error in the advanced rate, and ΔV is different from the true steel plate speed V.
An error of (= | V−V _{F (t)} |) occurred.

As a method of correcting these errors, for example, a speedometer is installed in front of the pinch roll, the slip ratio of the pinch roll is calculated from the peripheral speed of the pinch roll and the steel plate speed detected from the speedometer, and the wrapper roll step avoidance control timing is calculated. The method for correcting the above is disclosed in Japanese Patent Laid-Open No. 59-225815, but as described above, in the hot rolling plant, continuous detection of the steel plate speed other than that of the rotating body has low accuracy and cannot be applied.

Therefore, in the present invention, attention is paid to the fact that the detection accuracy is high for tracking the front end of a hot rolled steel sheet, and a tracking device is used to correct the steel plate speed detection value in the side guide on the front side of the winding machine to obtain the winding side. The purpose is to improve the accuracy of the short stroke drive start timing of the guide and to improve the coil winding shape.

[0011]

SUMMARY OF THE INVENTION According to the present invention, tracking is performed by performing speed correction at the same tracking timing of a steel plate speed detected when a steel plate passes by two tracking devices installed on a front side guide of a winder. It is intended to improve the accuracy of the steel plate speed detected by the finishing final stand thereafter and the accuracy of the start timing of the winding side guide short stroke.

[0012]

As shown in FIG. 1, when the steel plate speed in the finishing final stand 3 is VF _(t) , the steel plate is the one of the two tracking devices 4 and 5 installed on the side guide 1 which is the downstream side tracking device 5. The steel plate speed at the passing time t2 is V _{F (t2)} . On the other hand, two tracking devices 4, 5
If the steel plate speed measured by V _TR is V _TR , the deviation ΔV (= V _TR −V _{F (t2)} ) between the two is added to the strip steel speed V _{F (t)} after passing the downstream tracking device 5. That is, the steel plate speed V _{F (t)} 'after speed correction is as follows.
_{V F (t) '= V} F (t) + ΔV = V F (t) + V TR -V F (t2) ··· (3) ( provided that t ≧ 2) Accordingly, the distance is detected by the final finishing stand timer The value S ′ is S ′ = Σ (V _i ′ × Δt _i ) ... (4) S ′: Distance timer value after speed correction, Δt _i : Steel plate speed sampling interval, V _i ′ (= V _{F (t)} '): Steel plate speed at each sampling time after speed correction.

The steel plate velocity V _TR detected when passing the two tracking devices 4 and 5 is calculated by the following formula: V _TR = S / (t2-t1) (5) V _TR : Tip speed of the steel plate measured by the tracking device, S: distance between the upstream tracking device 4 and the downstream tracking device 5, t1: time when the steel plate tip passes through the upstream tracking device, t2: steel plate tip The time at which the downstream tracking device passes.

That is, in the present invention, two tracking devices 4 and 5 are installed in the sheet guide direction of the winder in the front side guide of the winder, and the time when the tip of the steel plate moves the distance S between them (time t2). -T1) is measured to calculate the speed V _TR ,
The deviation ΔV = V _TR −V _{F (t2)} from the steel plate speed V _{F (t2)} at time t2 detected by the finishing final stand 3 is calculated,
Then, the steel plate speed at an arbitrary time point is V _{F (t)} '= V _{F (t)} + Δ
Calculate as V. VF _(t) is a steel plate speed detected by the finishing final stand 3 at an arbitrary time point after the time t2.

[0015]

[Example] As a result of additionally installing one tracking device 5 on the rear surface of the existing tracking device (2 in FIG. 2 and 4 in FIG. 1) and correcting the steel plate speed by the two tracking devices 4 and 5. , The precision of the start timing of the short stroke drive has been significantly improved, and the coil winding shape at the tip of the steel plate has been greatly improved.

[Application] Since the accuracy of the detected value of the steel plate speed after the tracking device installed on the side guide can be improved, it is possible to accurately estimate the position of the front end of the steel plate. By combining with the tracking device, the actual AJC is estimated at the time when it is estimated that the steel plate tip reaches the position of the AJC tracking device.
When the tracking signal is not input to the C tracking device, it is estimated that the miscoil has occurred due to the pinch roll biting failure of the steel plate, and the rolling is instantaneously stopped.
It can be applied to methods such as minimizing damage caused by miscoils.

[0017]

EFFECTS OF THE INVENTION The present invention has the following effects: The accuracy of the steel plate speed detection value after passing the tracking device installed on the side guide is improved; The accuracy of the side guide short stroke drive start timing is improved, and the coil winding shape at the tip of the steel plate is significantly improved.

Damage can be minimized by estimating the position of the front end of the steel sheet in combination with, for example, an AJC tracking laser on the rear surface, instantaneously determining a miscoil and stopping rolling.

[Brief description of drawings]

1 is a drawing showing an embodiment of the present invention, (a)
Indicates a side guide between the finishing stand 3 and the winder,
(B) is a graph showing steel plate speed.

FIG. 2 is a view showing a conventional steel plate speed detection mode,
(A) shows a side guide between the finishing stand 3 and the winder, and (b) is a graph showing a steel plate speed.

[Explanation of symbols]

1: Front side guide of winder 2: Existing tracking sensor 3: Finishing final stand 4: Upstream tracking sensor 5: Downstream tracking sensor

Claims (2)

[Claims] 1. A speed correction at the same tracking timing of a steel plate speed constantly detected from a finishing final stand by using a steel plate tip speed detected when two steel plates pass by a two tracking devices installed on a winding front side guide. A method for detecting a steel plate speed of a winding facility, which is for improving the accuracy of a steel plate speed detected by a finishing final stand after tracking. 2. A steel plate speed in a finishing final stand, which is corrected to an appropriate speed by using a steel plate tip speed detected when a steel plate passes by two tracking devices installed on a winding front side guide, and a tracking device. A method for detecting a steel plate speed in a coiling equipment, characterized in that the coil winding shape is improved by improving the accuracy of the start timing of the short side stroke of the side guide of the winder front surface determined by the passage timing of the front end of the steel plate.