JPH02131B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a coil tip release position control device in a wire rod rolling facility, and more specifically, to a coil tip release position control device for a wire rod rolling facility, and more specifically, a coil tip discharge position control device for controlling a coil tip discharge position in a wire rod rolling facility. This invention relates to a coil tip discharge position control device that is formed into a coil shape and discharges the tip of the coil to a predetermined position on a belt conveyor by controlling the rotational speed of a laying head.

[Technical background of the invention and its problems]

In conventional rolling equipment of this type, the flow of wire from the finishing mill to the belt conveyor including the laying head is as shown in FIG. Figures 2a and b show the structure of the laying head, and Figures 3a and 3b show the coiled wire being discharged onto the belt conveyor by the laying head. It is a diagram.

As shown in Fig. 1, the wire rod 1 that has passed through the finishing mill FM is moved to the pinch roller LP as shown by the arrow 2.
is guided to the conical laying head LH. As shown in Fig. 2a and b, the laying head LH is connected to a worm gear W connected to a laying head driving motor M2.
It is rotated by the worm wheel WH fixed to the LH, and inside it is a spirally formed pipe.
PI is stuck.

Wire 1 enters from the inlet end D of the laying head LH, passes through the pipe PI, and enters the laying head LH.
Due to the rotation of , a continuous coil CL is formed, which is ejected from the exit end E of the laying head LH and falls onto the belt conveyor BL. Here, the belt conveyor
The position of the tip A of the coil CL discharged onto the BL varies depending on the rotation angle of the laying head LH. Therefore, when the tip A of the coil CL is released onto the belt conveyor BL at a position where it protrudes outside the coil as shown in FIG. This causes problems such as twisting and often stopping the line. In addition, depending on the position where the tip A of the coil is discharged onto the belt conveyor BL other than that shown in Figure a, it may be biased to the left or right with respect to the traveling direction of the belt conveyor BL, and there is a risk that it may come into contact with peripheral equipment, etc. be.

Therefore, conventionally, when processing the tip of a coil, the rotational speed of the laying head LH is controlled so that the tip A is pressed into the succeeding coil as shown in Figure 3b. By doing so, the tip A of the coil CL was discharged to a predetermined position on the belt conveyor BL.

That is, FIG. 4 is a diagram showing the arrangement of the conventional coil tip discharge position control device, and in the figure, the first
The same parts as those in the figures or corresponding parts are given the same reference numerals, and explanations of those parts will be omitted.

The conventional coil tip discharge position control device includes a first wire rod detector HD1 on the inlet side of the finishing rolling mill FM and a second wire rod detector HD2 on the exit side of the finishing rolling mill FM, as shown in Fig. 4. , a third wire rod detector HD3 is placed immediately in front of the pinch roller PR, and a finishing rolling mill drive motor M1
A first pulse oscillator PG1 is used for the motor M2 for driving the laying head, and a second pulse oscillator is used for the laying head drive motor M2.
PG2 and limit switch LS are installed respectively.

The first pulse oscillator PG1 oscillates wire rod movement speed detection pulses at regular intervals according to the rotational speed of the finishing rolling mill driving motor M1, and the oscillated pulses are sent to a first pulse counter (not shown). is counted. In addition, a second pulse oscillator PG2
oscillates a predetermined number of rotation detection pulses during one rotation of the laying head LH based on the rotational speed of the laying head driving motor M2,
The oscillated pulses are counted by a second pulse counter (not shown).

The first pulse counter (not shown) is the wire rod 1
When the tip of the wire rod reaches the position of the first wire detector HD1, counting of wire rod movement speed detection pulses generated by the first pulse oscillator PG1 based on the detection output of the detector HD1 is started; When the tip of the wire 1 reaches the position of the second wire detector HD2, the count value of the wire moving speed detection pulse is cleared by the detection output of the second wire detector HD2. In addition, a second pulse counter (not shown) is used when the laying head LH is at a certain reference position (for example, when the limit switch LS is set as shown in FIG. 2b).
Let the mounting position of the outlet end E be the reference position. ), the count value of the rotation detection pulse oscillated from the second pulse oscillator PG2 is cleared by the action of the limit switch LS.

Now, let's assume that the tip A of the coil CL is located at the optimal discharge position at the outlet end E of the laying head LH as shown in Fig. 3b.
The exit end E of is θR (0≦θR<1) from the reference position.
In general, this type of tip discharge position control is performed by predicting the discharge position of the coil tip A and correcting the rotational speed of the laying head LH.

In other words, by correcting the difference between the predicted discharge position θ and the optimum discharge position θR of the coil tip A to zero, the tip discharge position can be controlled. The predicted release position θ (0≦θ<1) of the coil tip A is calculated from the tracking start point of the wire 1 to the exit end E, with θLH being the position at which the exit end E of the laying head LH has rotated from the reference position at that time. If the distance is L, the distance that the tip of the wire 1 has moved from the tracking start point at that point is l, and the lead rate (advance rate) of the laying head rotation speed with respect to the transfer speed of the wire 1 is α, then in general, the following formula is obtained. It is sought after.

θ=θ _LH + (L-l)/π・D・M(1+α)−k…
...(1) However, in the above equation, D...Rotational diameter M of the exit end E of the laying head LH...Gear ratio k of the roll diameter to the rotation of the finishing rolling mill drive motor M1...Predicted release position θ is 0≦θ <1 (k=0, 1, 2, 3,...).

That is, the conventional coil tip discharge position control device turns on when the tip of the wire 1 reaches the position of the first wire detector HD1 (hereinafter referred to as the first tracking start point), and the 1) In equation (1), l and α were determined, and the rotational speed of the laying head LH was controlled based on equation (1).

This l was determined by the following equation, where L0 is the distance from the first tracking start point to the exit end E of the laying head LH, and L in equation (1) is L=L0.

l=P1・C......(2) However, in the above formula, P1...The count value of the first pulse counter C...The amount of movement of the wire 1 on the exit side of the finishing rolling machine per one pulse of the first pulse oscillator PG1 It is.

Further, the lead rate α of the laying head LH is calculated by setting the distance from the position of the second wire detector HD2 (hereinafter referred to as the second tracking start point) to the exit end E of the laying head LH as L1, and L in equation (1) was determined by the following equation, with L=L1.

α=N・π・D/L2−1 ………(3) However, in the above equation, L2 is the second wire detector
The distance between HD2 and the third wire detector HD3, N is the distance between the tip of the wire 1 and the third wire detector HD2.
This is the amount of rotation of the laying head LH until it reaches the wire detector HD3.

Therefore, the conventional coil tip discharge position control device does not perform discharge position control when rolling the first wire of the same lot, but calculates only the lead rate α using equation (3), and when rolling the second and subsequent wire rods. Sometimes, the laying head is determined by equation (1) based on this lead rate α.
It controlled the rotation speed of LH. In addition, the recent wire rod movement speed, especially the speed at the finish rolling mill FM exit side, is approximately
For the second and subsequent wire rods 1, for the purpose of securing control response time because it is as fast as 100 m/s,
When the tip is detected by the first wire detector HD1, preliminary control is started, and when the tip reaches the second tracking start point, the count value P1 of the first pulse counter is increased by 1. I cleared it once and performed the main control.

However, the lead rate α of the laying head LH obtained by the above equation (3) is actually 2
The preset value of the lead rate for wire rods of the same lot after the main run is not necessarily the same, and as a result, the predicted discharge position θ in equation (1) differs from the actual one, making it impossible to perform accurate discharge position control. .

[Purpose of the invention]

The present invention has been made based on the above circumstances, and an object of the present invention is to provide a coil tip ejection position control device that can always accurately detect the lead rate of a laying head and perform highly accurate ejection position control. The purpose is to

[Summary of the invention]

In order to achieve the above object, the present invention arranges first and second wire rod detectors at a certain distance apart from each other in the traveling direction of the wire on the entrance side of the finishing rolling mill, and on the exit side of the finishing rolling mill. arranging a third wire detector;
Determine the lead rate of the laying head when the tip of the wire passes between the first and second wire detectors,
The present invention is characterized in that the rotation speed of the laying head is controlled based on this lead rate when the tip of the wire reaches the position of the third wire detector.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 5 is a diagram showing the arrangement of a coil tip discharge position control device according to an embodiment of the present invention. In the figure, the same or corresponding parts as in FIG. 4 are denoted by the same reference numerals. Explanation will be omitted.

That is, in this embodiment, as shown in the figure, a fourth wire detector HD4 is placed in front of the wire detector HD1 at a distance L3, and when the tip of the wire 1 reaches the position of this detector HD4. Then, based on the detection output, the first pulse counter starts counting the wire movement detection pulses of the pulse oscillator PG1, and measures the read rate α of the laying head LH.

The lead rate α of the laying head LH is the wire rod 1
The rotation amount N1 of the laying head LH during the period in which the tip of the wire rod passes from the fourth wire rod detector HD4 to the first wire rod detector HD1, and the amount of rotation N1 of the laying head LH during the period when the tip of the wire rod 1 passes from the fourth wire rod detector HD4 to the first wire rod detector HD1, and the amount of rotation N1 of the laying head LH during the period when the tip of the wire rod 1 passes from the fourth wire rod detector HD4 to the first wire rod detector HD1. By determining the distance l1 in the case, the following equation is obtained.

α=N1・D・π/l1−1 ………(4) Also, the amount of rotation N1 of the laying head LH is the number of pulses generated by the second pulse oscillator PG2 during that period by a predetermined number of pulses per one rotation of the laying head. It is obtained by dividing by the number of generated pulses, and the moving distance l1 is the first pulse oscillator PG in that period.
It is obtained by multiplying the number of generated pulses by the material movement amount C on the exit side of the finishing rolling mill per pulse.

Therefore, in equation (4) above, the count value of the first pulse counter in that period is P2, the count value of the second pulse counter in the same period is P3, and the second pulse count per rotation of the laying head is If the count value of the pulse counter is P4, it can be transformed into the following equation.

α=(P3/P4)・D・π/P2・C……(5) When the lead ratio α of the laying head LH with respect to the wire rod 1 on the inlet side of the finishing rolling mill FM is determined in this way, the wire rod When the tip of the laying head LH reaches the position of the second wire detector HD2, the rotational speed of the laying head LH is controlled based on the equation (1).

Therefore, according to this embodiment, two
Since the lead ratio can be measured for each wire rod without using the lead ratio measured for the first wire rod after the first wire rod, it is possible to control the coil tip discharge position with extremely high accuracy.

[Effects of the Invention] As explained above, according to the present invention, first and second wire rod detectors are arranged on the entrance side of a finishing rolling mill at a certain distance apart from each other in the direction of movement of the wire rod;
A third wire rod detector disposed on the exit side, a first counting means for counting the amount of rotation of the motor for driving the finishing rolling mill, and a second counting means for counting the amount of rotation of the laying head. With this configuration, it is possible to provide a coil tip ejection position control device that can always accurately measure the lead rate of the laying head and perform highly accurate ejection position control.

[Brief explanation of drawings]

Figure 1 is a line diagram showing the flow of wire in the wire rolling equipment, Figures 2a and b are diagrams showing the configuration of the laying head, where Figure a is a side view, Figure b is a front view, and Figure 3 is a diagram showing the configuration of the laying head. Figures a and b are diagrams showing the state in which the tip of the coil is released onto the belt conveyor. Figure a is a state diagram showing a defective state, Figure b is a state diagram showing an optimal state, and Figure 4 is a state diagram showing a conventional coil. FIG. 5 is an arrangement diagram showing the arrangement of a coil tip discharge position control device according to an embodiment of the present invention. FM...finishing mill, LP...pinch roller,
LH...laying head, BL...belt conveyor, CL...coil, LS...limit switch,
PG1, PG2...Pulse oscillator, HD1~HD4
...Wire rod detector, 1...Wire rod.

Claims (1)

[Claims] 1. The wire rod passed through the finish rolling mill of the wire rod rolling mill,
A coil tip release position control device for a wire rod rolling facility that forms a coil into a coil by a rotating laying head and releases the tip of the coil to a predetermined position on a belt conveyor by controlling the rotational speed of the laying head. first and second wire rod detectors arranged at the entrance side of the finishing rolling mill at a certain distance from each other with respect to the traveling direction of the wire rod; and a third wire rod detector arranged at the exit side of the finishing rolling mill. a first counting means for counting the amount of rotation of the electric motor that drives the finishing rolling mill, and a second counting means for counting the amount of rotation of the laying head, When passing between the first and second wire detectors, an advancement rate of the laying head is calculated based on the counts of the first and second counting means during the same period, and based on this advancement rate. A coil tip discharge position control device for a wire rod rolling facility, characterized in that the rotation speed of the laying head is controlled when the wire rod passes through the third wire rod detector.