JPH0751723A - Method for controlling position of cooling floor screw - Google Patents

Abstract

PURPOSE:To control a screw position within a most suitable range especially without receiving the influence of the mill velocity. CONSTITUTION:Tubes are tracked until carrying out to a cooling floor 6 by reading cut-pitch velocity and screw receiving angle and calculating the command value of cooling floor velocity from the cut-pitch velocity, and it is controlled so that it comes to the screw receiving angle in the accelerated or decelerated pitch velocity by obtaining the deviation of screw movement at one piece before carrying out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling bed screw position control method and, more particularly, to a control method which makes it possible to adjust a screw position to an optimum range without being influenced by a mill speed.

[0002]

2. Description of the Related Art As a conventional technique, as shown in FIG.
The mill 1 makes a continuous pipe by heating and rolling the slit cold-rolled material, the cutting saw 2 cuts the pipe to a preset length, and the sizer 3 straightens the pipe. . The conveyor 4 conveys the pipe from the mill to the cooling floor, and the kicker 5 vertically pays out the pipe conveyed to the cooling floor.

[0003] During proper (no trouble), there are two pipes inside. The cooling floor 6 cools the pipe discharged from the kicker while continuously rotating the pipe and conveys it to the downstream equipment.

[0004]

SUMMARY OF THE INVENTION In the above prior art,
Since the speed command of the cooling bed changes in synchronization with the acceleration and deceleration of the mill speed and the speed command of the cooling bed changes at the timing when the mill accelerates and decelerates, many pipe receiving errors occur.

The present invention advantageously solves the problems of the prior art and provides a position control method for a cooling floor screw which makes it possible to adjust the screw position to an optimum range without being affected by the mill speed. The purpose is to provide.

[0006]

According to the present invention, a cutting pitch speed V at the time of automatic start of a cooling floor screw, a screw receiving angle (preset) A are read, a cooling floor speed command value C is calculated from V, and a reference speed is calculated. When the mill accelerates / decelerates when rotating the cooling bed, the pipe at the time of acceleration / deceleration is tracked until the pipe is dispensed to the cooling bed, and the screw movement deviation ΔA is obtained before one is dispensed,
The position control method of the cooling floor screw is characterized in that the speed command of the cooling floor is controlled so that the speed command to the position A can be reached at the accelerated and decelerated pitch speed V '.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. Figure 1
FIG. 4 is a diagram showing an example according to the present invention. The mill 1 makes a continuous pipe by heating and rolling the slit cold-rolled material, the cutting saw 2 cuts the pipe to a preset length, and the sizer 3 straightens the pipe. . The conveyor 4 conveys the pipe from the mill to the cooling floor, and the kicker 5 vertically pays out the pipe conveyed to the cooling floor.

[0008] During proper (no trouble), there are two pipes inside. The cooling floor 6 cools the pipe discharged from the kicker while continuously rotating the pipe and conveys it to the downstream equipment.

Further, the control device 10 uses a
Cut timing, b pipe passage timing, c kicker rotation position, d cooling floor rotation position are taken in, pitch speed is calculated from a (b is used for backup), movement deviation is calculated from d, and cooling floor speed command is calculated. And operate the cooling floor.

FIG. 2 is a diagram showing the movement of the pipe and the movement of the screw. The pipe passes over No1 and the kicker operates with the b pipe passage timing signal to shift the pipe to the right. When the pipe passes No1, it is shifted to No2 with one kick, shifted to No3 with two kicks, and is delivered to the cooling floor for the third time, and the cooling floor receives the pipe.

The cycle time for operating the cooling bed is predicted from the a cut timing, and the cooling bed is added to correct the deviation between the receiving target angle (preset value) and the d cooling bed rotation position (current angle) within the cycle time. Slow down.

FIG. 3 is a diagram showing a flow of the present invention.
V: Cut pitch speed at the time of automatic start of the cooling floor screw, A: Screw receiving angle (preset) are read, C (cooling floor speed command value) is calculated from V, and the cooling floor is rotated as a reference speed.

When the mill accelerates or decelerates, the cut pitch speed changes. If the pipe is rotated at the above-mentioned reference speed at a constant speed, the pipe cut period is changed, so that the angle is outside the acceptance angle. When the mill accelerates / decelerates The pipe during acceleration / deceleration is tracked until it is delivered to the cooling floor, and one line before delivery (No 3 in FIG. 2), ΔA: The screw movement deviation is obtained V ′: Acceleration / deceleration The speed command for the cooling bed is controlled so that the position A is reached at the current pitch speed.

FIG. 4 is an operation flow chart of the control method according to the present invention. When the size of the pipe is 50A, the cut pitch is about 4.3 seconds. It takes about 5 seconds, like when the mill slowed down. When the kicker operates twice and the pipe comes to the No. 1 position, the speed reference of the cooling bed is changed to a wide range so that the rotation position of the cooling bed is kept constant.

(A) is the cut timing, which is about 4.3 seconds at 50 A and about 5 seconds when the mil decelerates. (B) is a pipe passage timing, which operates a few seconds after the cut timing. The intervals will be a little shorter,
It changes proportionally. (5) is triggered by (b) as 1
Rotational movement, shifting the pipe to the right, (c) is the angle in (d). (6) rotates at the reference speed obtained from the pitch speed of (a), and when the mill decelerates, the speed reference is changed to a wide range after two rotations of the kicker. (Although there are some fluctuations even under normal conditions). (D) is the angle of (6).

[0016]

According to the position control method of the present invention described above, a receiving error due to acceleration / deceleration of mill speed does not occur.

[Brief description of drawings]

FIG. 1 is a diagram showing an example based on the method of the present invention.

FIG. 2 is a diagram showing movement of a pipe and movement of a screw.

FIG. 3 is a flow chart of the present invention.

FIG. 4 is an operation flow diagram of the control method according to the present invention.

[Explanation of symbols]

 1 mil 2 Cut and sew 3 3 Sizer 4 Conveyor 5 Kicker 6 Cooling floor 10 Controller

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B65G 43/00

Claims (1)

[Claims] 1. V: Cut pitch speed at the time of automatic start of the cooling bed screw, A: Screw receiving angle (preset) is read, C (cooling bed speed command value) is calculated from V, and the cooling bed is set as a reference speed. When rotating,
When the mill accelerates / decelerates, the pipe at the time of acceleration / deceleration is tracked until the pipe is dispensed to the cooling floor, and ΔA: the screw movement deviation is obtained before the pipe is dispensed. The position control method of the cooling floor screw is characterized by controlling the speed command of the cooling floor.