JPS5964117A - Device for controlling discharging position of coil front end in wire-rod rolling installation - Google Patents

Abstract

PURPOSE:To detect the accurate leading rate of a laying head, and to control accurately the discharging position of the front end of a coil, by providing wire rod detectors to the inlet and outlet sides of a finish mill, and providing counting means of rotating amount to the driving motor of the mill and the laying head respectively. CONSTITUTION:The 1st and 2nd wire rod detectors HD4, HD1 are arranged at the inlet side of a finish mill FM, at a fixed distance L3 from each other in the advancing direction of a wire rod, and the 3rd wire rod detector HD2 at the outlet side of the mill FM. Then the leading rate of a laying head LH is obtained when the front end of the wire rod passes a space between the 1st and 2nd detectors HD4, HD1, and the rotating speed of the head LH is controlled basing on the obtained leading rate when the front end of the wire rod arrives at the position of the 3rd detector HD2.

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 laying head that rotates a wire phase that has passed through a finishing mill of a wire rod rolling mill. The present 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. Also, Figure 2A2 (a)
(b) is a diagram showing the configuration of the above-mentioned laying head, and FIG. 3(b) is a diagram showing a state in which the wire formed into a coil shape by the laying head is discharged onto a belt conveyor. .

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

The inlet end of the laying head LH has been inserted ■ Wire 1 is passed through the inoya PP, and the wire rod 1 is passed through the inlet of the laying head LH.
Due to the rotation of the coil CL, it is released from the exit end of the laying head LH (EJI) and transferred to the belt conveyor BL.
fall on top. Here, the position of the tip A of the coil CLO discharged onto the belt conveyor 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 11111 as shown in FIG. This causes the tip A of the coil to twist, often causing the line to stop. 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 the figure (, ), 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 the coil,
As shown in FIG. 3(b), the rotational speed of the laying head LH is controlled so that the tip A of the coil CL is pressed down by the succeeding coil.
was discharged to a predetermined position on the belt conveyor BL.

That is, FIG. 4 is a diagram showing the arrangement and configuration of a conventional coil tip ejection position bk control device, and FIG.
The same reference numerals are given to s or corresponding parts, and the explanation of these parts will be omitted.

The conventional coil tip discharge position control device has a first wire rod detector HD7 on the inlet side of the finishing rolling mill FM, as shown in Fig. 4.
and finishing pressure lJ:, a second wire rod detector HD2 is installed on the exit side of the machine F''M, and a third wire rod detector HD3 is installed at the position immediately before the pinch roller PR. , a first pulse oscillator PGJ is connected to the finishing rolling mill driving motor Ml, and a second pulse oscillator PGJ is connected to the finishing rolling mill driving motor M2.
A pulse oscillator PG2 and a limit switch LS are respectively attached.

The first Noyals oscillator PGI oscillates wire rod movement speed detection pulses at fixed time intervals according to the rotational speed of the finishing rolling mill driving motor M), and the oscillated pulses are processed by a first pulse counter (not shown). It is counted. Also the second
The pulse source Jh1 device PG2 generates the laying head LH based on the rotational speed of the driving motor M2.
A constant number of rotation detection pulses are oscillated during one rotation of the motor, and the oscillated pulses are counted by a second pulse counter (not shown).

When the tip of the wire rod 1 reaches the position of the first wire detector HDI, the first thousand pulse counter (not shown) uses the detection output of the detector HDI to generate the first thousand pulse oscillator. Detection of the moving speed of the wire rod oscillated by PGJ/4' When the tip of the wire rod 1 reaches the position of the second wire detector HD2, the detection output of the detector HD2 is detected. This clears the count value of the wire rod movement speed detection pulse. In addition, a second pulse counter (
(not shown), each time the laying head LH rotates once from the reference position (for example, as shown in FIG. 2(b), the limit switch LS is located at the reference position of the exit end E). This clears the count value of the rotation detection/4' pulse oscillated from the second pulse oscillator PG2 by the action of the limit switch LS.

Hypothetically, the tip A of the coil CI is at the optimal ejection position from the outlet end E of the laying head LH as shown in FIG. 3(b), and the outlet end E of the laying head LH is at the reference position. Assuming that the coil is rotated by more than θR (0≦θR<1), the glaze tip discharge position control is generally performed by predicting the discharge position of the coil tip A and correcting the rotational speed of the laying head LH.

In other words, the tip emission position can be controlled by correcting the difference between the predicted emission position θ and the optimum emission position θR of the coil tip A to zero.

The predicted release position θ (0≦θ×1) of the coil tip ψiAA is:
The position where the exit end E of the laying head LH has rotated many times from the reference position at that point is θLH, and the track of the wire J,
The distance from the tracking start point to the exit end E is the distance that the tip of L1 wire 1 has moved from the tracking start point at that point. The lead rate (advance rate) of the laying head rotation speed relative to the transfer speed of line 1 is t1. Assuming α, it is generally determined by the following formula.

However, in the above formula, D...Rotational diameter M of the outlet end E of the laying head LH
. . . The rolls (k=0.1.2, 3, . . . ) relative to the rotation of the finishing rolling mill driving motor M1.

That is, the conventional coil tip discharge position control device is turned on when the tip of the wire 1 reaches the position of the first wire detector HDI (hereinafter referred to as the first tracking start point). Find t and α in the formula (1), and calculate the (
1) The rotational speed of the laying head L)I was controlled based on the formula.

This t is the distance from the first tracking start point to the exit end E of the laying head LH, and the (1st)
It was determined by the following formula, with L in the formula as ri,...,LO.

t=pi・C...(2) However, in the above equation, PI...the count value of the first Noriless counter C...
・This is the amount of movement of the wire rod 1 on the exit side of the finishing rolling mill for each 1.9 Lus of the first Lus oscillator PGI.

Further, the lead rate α of the laying head LH is determined by the distance L 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. L in equation (1) was determined by the following equation, with L=LJ.

N・π・D α=□−1...(3) L However, in the above equation, L2 is the distance between the second wire detector HD2 and the third wire detector HD3, and N is the tip of the wire 1. is the second wire detector HD2 to the third wire detector HD,
This is the amount of rotation of the laying head LH until it reaches 9.

Therefore, the conventional coil tip release position control device does not perform release position control when rolling the first wire rod of the same lot, but only calculates the lead rate α using equation (3), and when rolling the second and subsequent wire rods, this lead rate is determined. (1) based on α
The rotational speed of the laying head LH was controlled by the formula. In addition, recent wire movement speeds, especially the speed at the FM exit side of the finishing mill, are as fast as approximately 100 m/s, so in order to ensure control response time, the tip of the second and subsequent wires is is detected by the first pure material detector HD7, preliminary control is started, and when the tip reaches the second tracking start point, the count value PI of the first particle counter is increased once. This was cleared and main control was performed.

However, the lead rate α of the laying head LH obtained by the above equation (3) is not necessarily the same as the preset value of the lead rate for the second and subsequent wire rods of the same lot. 1) The predicted release position θ in the equation differed from the actual release position, making it impossible to control the release position accurately.

[Purpose of the invention]

The present invention d1 has been made based on the above circumstances, and provides 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

[4th aspect 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 direction of movement of the wire rod on the inlet side of the finishing rolling mill, A third wire rod detector is placed on the exit side of the finishing rolling mill, and the tip of =@ is the first and second wire rod detector.
The lead rate of the laying head is determined when the wire passes between the wire detectors, and based on this lead rate, the tip of the wire is 3+ill! The laying head is designed to control the rotational speed of the laying head when it is slow to the position of the falling detector.

[Example of Zuto Akira]

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 HD is provided at a distance L3 in front of the wire detector HD7.
4 is arranged, and the tip of wire 1 is connected to this detector HD.
When the fourth position is reached, the detection output causes the first /
4' The pulse counter starts counting the wire rod movement detection pulse name of the pulse oscillator PGj, and the laying head LH
Measure the lead rate α.

The lead rate α of the laying head LH is determined by the rotation tN of the laying head L during the period in which the tip of the wire passes from the fourth wire detector HD (from the first wire detector HDJ). , the distance t when the tip of the wire rod moves through the finish rolling mill exit 11111 during the same period is obtained by the following equation.

α=□-1...(4) The amount of rotation N1 of the laying head LH is calculated by calculating the number of pulses generated by the second pulse oscillator PG2 during that period by the predetermined number of pulses generated per one rotation of the laying head. By dividing by the number (1, moving distance t), multiply the number of pulses generated by the first Norrus oscillator PG7 in that period by the amount of material movement C on the exit side of the finishing rolling mill per Torrus. Served by.

Therefore, the above formula (4) sets the count value of the first pulse counter in that period as 'cP2, the count value of the second pulse counter in the same period as P3, and the second pulse counter per revolution of the laying head as 'cP2'. Letting the count value of P4 be P4, it can be transformed into the following equation.

α=”￥F9uni...(5) When the lead ratio α of the laying head LH with respect to the wire rod on the inlet side of the finishing rolling mill FM is determined in this way,
When the tip of the wire reaches the position of the second wire detector H''D2, the rotational speed of the V-ing head LH is controlled based on the equation (1).

Therefore, according to this embodiment, instead of using the lead ratio measured at one end for the second and subsequent wire rods as in the conventional case, [Effects of the Invention] As explained below, According to the present invention, first and second wire rod testers are arranged at a certain distance in the direction of movement of the wire on the artificial side of the finishing rolling mill, and a third wire rod tester is arranged at the outlet of the wire rod tester. Since the structure is equipped with a W month detector, a first counting means for counting the amount of rotation of the finishing rolling mill drive motor, and a second counting means for counting the amount of rotation of the laying head, it is possible to always It is possible to provide a coil tip discharge position control device that can accurately measure the lead rate of a laying head and perform highly accurate discharge position jill-fall.

[Brief explanation of drawings]

Figure 1 is a line diagram showing the flow of wire rods in wire rod rolling equipment, Figure 2 (a) is a diagram showing the configuration of the laying head, and figure (b) is a side view. is a front view,
Figure 3 (a) and (b) are diagrams showing the state in which the tip of the coil is released onto the belt conveyor, Figure 3 (,) is a state diagram showing a defective state, and Figure 3 (b) is a diagram showing an optimal state. The state diagram, Figure 4, is the arrangement 6 of the conventional coil tip discharge position IIq control device.
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...finish rolling 44, t, p...pinch roller,
LH...laying head, BL...belt conveyor, CL...coil, LS...limit switch,
7 for P, PG,? ...Pulse oscillator, HDJ-II0
4... Wire rod detector, 1... Wire rod. Applicant's representative Patent attorney Takehiko Suzue 1st medical doctor 2nd prisoner 3rd prisoner

Claims (1)

[Claims] The wire passed through the finishing mill of the wire rod rolling mill is formed into a coil by a rotating laying bed, and the tip of the coil is discharged to a predetermined position on a belt conveyor by controlling the rotational speed of the laying head. In a coil tip discharge position control device in a wire rod rolling facility, first and second wire rod detectors are arranged on the inlet side of the finishing rolling mill at a certain distance from each other with respect to the traveling direction of the wire rod; a third wire rod detector disposed on the exit side of the mill; and a first wire rod detector for counting the rotational dip of the electric motor that drives the finishing mill.
and a second gi number means for counting the rotation value of the laying head, and when the tip of the wire passes between the first and second wire vane detectors, the same An advancement rate of the laying head is calculated based on the counts of the first and second counting means during the period, and when the front 6th wire passes through the third wire detector based on this advancement rate. A coil tip discharge position control device for wire rod rolling installation i1i, characterized in that the rotational speed of the laying head is controlled.