JPS5884613A - Device for controlling angle of laying head - Google Patents

Abstract

PURPOSE:To obtain a titled controlling device for controlling the angle of a laying head detected at the time when the tip of a wire rod is delivered, to be a fixed value, by providing two sets of material detectors to the outlet side of a wire rod mill, and constituting the devices to accurately calculate the position of the tip of the wire rod. CONSTITUTION:Controlling is started when a biting of the tip of a wire rod 1 by a finishing mill NT is detected with the aid of a biting detector DE. The moving speed of the tip of the wire rod 1 and its position after starting the controlling are calculated basing on the time that the tip of the wire rod 1 requires to pass through material detectors HD3 and HD4. On the other hand, in a laying head LH, the position of it is calculated by combining a pulse outputted from a pulse oscillator PLG and a reset of a limit switch LS; from said calculation, a correcting signal is outputted until the angle of a delivery port of the laying head LH detected at the time when the tip of wire rod 1 reaches said delivery port, coincides with a target value, thereby controlling the number of revolutions of the laying head LH.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laying head angle control device in a wire rod rolling mill that controls the angle of the laying head to be constant when the tip of the wire is discharged from the laying head that winds the wire into a ring shape. It is.

A conventional device of this type is shown in FIG. The figure shows an outline of the line from the finishing mill (NT) to the laying head. The wire (1) advances in the direction of the arrow (G), passes through the finishing mill (NT), and then goes to the laying head (
LH) is wound into a ring shape to form a coil (2),
placed on the conveyor.

FIGS. 2(i') and 2(b) show the shape of the laying head (LH) in FIG. 1, and the wire (1) is discharged through a spiral pipe. This laying head (LH) is driven by a driving electric motor (M2). As shown in Figure 8, when the tip σ) of the wire (1) discharged from the rotating laying head (LH) is conveyed by the conveyor at a position protruding from the ring, it gets caught on the conveyor and becomes tangled. There may be times when you have no choice but to stop. For this reason, conventionally, the position of the tip of the laying head has been controlled as shown in Japanese Patent Publication No. 54-84118, for example.

This method uses material detectors (HDI) and (HD2) on the entry and exit sides of the finishing mill (NT) as shown in Figure 1.
A pulse transmitter (PLGI) is attached to the finishing rolling mill drive motor (Ml), and a pulse transmitter (PLG2) is attached to the rolling head drive motor (M2).
and a limit switch (LS) to control the position of the tip of the laying head. In this case, the overall control is from when the tip of the wire (1) passes through the material detector (MDI) until it reaches the material detector (HD2).
'Similar control is performed in two stages after passing through the material detector (HD2).

The configuration of a control device for this purpose is shown in FIG.

First, to explain the case after the tip of the wire rod (1) passes the material detector HD2, when the tip of the material (1) is detected by the wire rod detector (HD2), the finishing rolling mill (NT
The pulse from the pulse transmitter (PLGI) on the side of
G1) and is incremented by a counter (CTRI). A variable resistor (
The value (Yl) obtained by determining the coefficient by RH2) and converting it from D to A by a digital/analog converter (DAI) corresponds to the distance from the wire detector (HD2) to the tip of the material.

That is, the rotation speed nl of the finishing rolling mill driving electric motor (Ml) while the wire rod (1) travels S (c) is determined by the roll diameter D M6111 of the final stand of the finishing rolling mill, the finishing rolling mill driving electric motor and the finishing rolling mill driving electric motor (Ml). If f is the advance rate at which the stand's gear ratio GR1 wire is ahead of the circumferential speed of the roll (1), then π・DM
−GR・(1+f) −°−(
1). If PM is the number of pulses of the pulse transmitter (PLGI) when the finishing rolling mill driving electric motor (Ml) rotates once, then nl·PM pulse corresponds to S (c). The variable resistor (RH2) should be set as follows.

On the other hand, pulse transmission 1 (PLG2) of the laying head is added up by counters (CTR2) and (CTR8). Each time the laying head rotates once until the tip of the wire (1) reaches the material detector (HD2), the count is reset from zero again using the limit switch (LS). wire(
1) When the tip reaches the material detector (HD2), the value of the counter (CTR8) is preset to the counter (CTR2), and the counter (CTR2) is continuously controlled by the pulse from the pulse transmitter (PLG2) of the laying head. will be counted.

The count number of the pulse counter (CTR8) when the tip of the wire (1) reaches the material detector (HD2) is Po, and the distance S (of the wire (1) from the material detector (HD2) to the laying head discharge port is Let P2 be the number of pulses of the pulse transmitter (PLG2) generated while running C), and let P2 be the number of pulses of the pulse transmitter (PLG2) generated during one rotation of the laying head.
If the number of pulses in 2) is PL and the count number of the counter (CTR8) when the ejection port of the laying head reaches the ejection target point is 2 PL, then PO + P2 = (K+-7) Pt
-(2) However, if the rotation angle of the laying head (LH) is controlled so that the integer of K = 1.2.8... is established, the tip of the wire can be placed at a desired position on the conveyor. It should be. In addition, control is performed in the same way until the tip of the wire rod (1) reaches the material detector (HDI) on the entry side of the finishing rolling mill (NT) to the material detector (HD2) on the exit side of the finishing rolling mill (NT). be able to.

The above is the angle control of the laying head (LH) by the conventional laying head (LH) position control device.

However, in such conventional equipment, ■Wire (1)
An error occurs because the distance traveled is estimated by counting the pulses from the pulse transmitter (PLGI) and multiplying this count value by a coefficient from the variable resistor (RH2).

(2) Since the initial control is performed from the material detector (HDI), the control starts before the wire rod (1) is bitten by the steel rolling mill (NT). In this case, the rotation speed of the finishing rolling mill driving electric motor (Ml), that is, the pulse transmitter (
There is no relationship between the number of pulses of PLGI) and the distance traveled by the wire, so equation (1) does not hold true. In particular, if the angle control of the laying head (LH) is started when the finishing rolling mill (NT) is about to be changed to a certain set speed, the number of pulses of the finishing rolling mill and the moving distance of the wire (1) will be Since the relationship is completely different from Equation (1), it causes a disturbance, and there are drawbacks such as the inability to bring the discharge port of the raining head to the target discharge point.

This invention was made in order to eliminate the drawback of the conventional method described above.In order to solve the above-mentioned drawback ①, two material detectors are installed on the exit side of the NTZ wire, separated by a certain distance, and By counting the number of pulses from the finishing mill's pulse transmitter while the tip passes through these two material detectors, we can actually measure the distance the wire travels per pulse of the finishing mill's pulse transmitter, and use this value as well. On the other hand, for the above-mentioned drawback (2), by detecting a signal indicating that the wire is caught in the cutting mill and starting control at this timing, equation (1) is always satisfied. It is an object of the present invention to provide angle control of a laying head and a device therefor, which performs control only during the period of time, and does not have the drawbacks of the prior art.

Hereinafter, one embodiment of the present invention will be described based on the drawings. In Fig. 5, (DE) is a wire rod (
1) is a biting detection device that detects biting. This jam detection device (DE) is a finishing rolling mill driving electric motor (M
By inputting the current 1) and differentiating it, the rise of the current, that is, the biting of the wire (1) is detected.

(HD8) and (HD4) are finishing rolling mills (NT)
This is a pair of material detectors installed on the exit side with a distance of L (ITI>).A counter is detected between the time when the tip of the wire is detected by the material detector (HD8) and the time when it is detected by the material detector (HD4). If the number of pulses of the pulse transmitter (PLGI) counted by (CTRIA) is PL, then the tip of the wire (1) moved by L (c) during this time, so
The distance of the tip of the wire (1) traveled per pulse of the pulse transmitter (PLGI) is K = dingr... (3
), and operation A performs these calculations.

The angle of the laying head (LH) is controlled by the biting detection device (D).
E) detects the biting, that is, when the tip of the wire rod (1) is bitten by the finishing rolling mill (NT), the finishing rolling mill (NT)
) Until the material detector (HD8) on the outlet side detects the leading edge of the material, and after this material detector (HD8) detects the leading edge of the material, the leading edge of the material is at the discharge port of the laying head (LH). The process is divided into two stages until reaching . Each time this two-step control is started, a pulse transmitter (PLG) attached to the finishing rolling mill driving electric motor (Ml) is activated.
The pulse of I) is passed through the counter (CT
RI).

By multiplying the value of this counter (CTRI) by K obtained by equation (3), that is, the value obtained by operation A, the wire rod (1)
The tip position of can be calculated.

On the other hand, pulses from the pulse transmitter (PLG2) of the laying head are given to counters (CTR2) and (CTR8).

The value of the counter (CTR8) is reset by the limit switch (LS) every time the laying head rotates once. When control is started by the biting detection device (DE) or material detector (HD8), the count value of the counter (CTR8) is preset to the counter (CTR2), and from then on, the counter (CTR2) is used as the pulse transmitter of the laying head. (P
Continuously count the pulses of LG2) from a preset value. The number of pulses multiplied by a constant value KK (the distance traveled by the laying head per pulse) becomes the feedback signal for the position of the laying head.

Next, the time from when the tip of the wire rod (1) is detected to be bitten in the finishing rolling mill by the biting detector (DE) until the tip of the wire rod (1) reaches the laying head (LH) is measured. 1)
2) From detection of biting to detection of the tip of the wire rod (1) by the material detector (HD8) on the exit side of the finishing rolling machine, and 2) when the tip of the wire rod (1) is detected by the material detector (HD8) on the exit side of the finishing rolling machine. The operation will be explained in more detail by using an example in which the ejection is divided into two stages, from when it is detected until it reaches the ejection port of the laying head.

A jamming detector (DE) detects that the tip of the wire (1) is bitten in the finishing rolling mill. The first control is started at this timing. At this time, the counter (CTR8) value PO
is preset in the counter (CTR2). Pulse transmitter (PLO2) per revolution of the laying head (LH)
If the number of rotations is Pt, the count value po at this time is the angle P
.

When converted to degrees, it is (-P-il-x860)0, that is, the angle of the discharge port of the laying head (LH) when biting is detected is limit P.

It is located at a position of 1τ×860° with respect to the cut-off switch (LS). Also, P converts this into a position.

and -5×πD6'1 from the limit switch (LS)
This means that they are at a distance of 11. Laying head (LH)
If the circumferential speed of wire rod (1) is synchronized with the wire rod speed,
The number of revolutions NLH of the laying head (LH) while traveling the distance sh is the rotational diameter of the discharge port of the laying head D61
11, it is expressed by the following formula.

NLH＝蒲・・・・・・
(4) Therefore, when the wire (1) runs a distance of S (m: 1×7), the angle of the laying head (LH) is expressed by the following formula.

Po Po'-X860'+NLHX860°=(pτ0Nt, Φ×
860°L = N
= positive integer of 1.2.8...) It is sufficient if this angle α matches the target angle. That is, [If the target angle is set to β0 from the limit switch (LS), then the difference in angle between β and equation (5) (β-α) is 0 and the laying head (LH)
If the angle is corrected, the ejection port of the laying head (LH) can always be positioned at the target angle β. FIG. 5 shows this in block diagram form.

In the figure, all angles are converted into distances.・In other words, the product of the counter (CTRI) and operation A is wire (1)
, and the counter (CTR2) and constant are (C
Equation (5) is converted into distance by multiplying by the moving distance of the ejection port of the laying head per one pulse of TR2.

Letting these be LLOD and LLH, respectively, if the laying head (LH) is synchronized with the speed of the wire (1), then
The difference between LROD and LLH is always constant. Further, target angle 1 and target angle 2 are the target angles β converted into distances when the control is performed for the first time (from detection of jamming to HD8) and for the second time (from HD8 to LH), respectively.

During control, only either target angle 1 or target angle 2 is output. When control is started, the difference between the target angle β converted into distance and (LROD-LLH) is added to the speed reference of the laying head as an angle correction signal for the laying head (LH).

This signal causes the laying head (LH) to increase or decrease its speed. Therefore, the speed of the laying head and the speed of the wire rod are no longer synchronized, and l (LROD - LLH)
changes, and when it finally matches the target angle β converted into distance, the control ends.

If the control is not completed even when the tip of the wire (1) reaches the material detector (HD8), repeating the same control will cause the tip of the wire (1) to reach the laying head (LH). Control can be performed until the discharge port is reached.

The finish rolling mill for the wire rod (1) is composed of a plurality of stands, and when the final dimension of the wire rod (1) is thick, the last few stands may be removed for rolling. In such a case, the apparent distance (distance converted to the final stand) from the biting detection to the material detector (HD8) differs, and therefore the target angle differs.

Therefore, the number of target angles that can be used as the final stand is required for control from the biting detection to the material detector (HD8).

In the above embodiment, the second control is performed using the material detector HD8.
I decided to start with the material detector (HD4).
You may start from In this way, the second control will be performed using a material detector (HD8) with two wire tips (HD8), (
Since the calculation is performed after passing through HD4), the calculation expressed by equation (3) is performed on the wire currently passing through, and calculations can be made based on the calculated value.

On the other hand, in the method described in the above embodiment, the control is started before the tip of the wire (1) passes the material detector (HD4), so the calculation of equation (3) is performed in one step. Data of previous material or data of several previous materials
It is calculated using the average value of , but it is known that the calculation of equation (3) is almost constant for each material, and that it changes in units of the order of several hours. This is not a problem because

As described above, according to the present invention, in the control to keep the angle of the laying head constant when the tip of the wire is discharged from the discharge port of the laying head, after the wire has bitten into the finishing mill, By measuring the distance traveled by the wire using a pulse transmitter, and by actually measuring the distance traveled by the wire and the number of pulses from the pulse transmitter of the finishing mill, more accurate control can be achieved.

In addition, by actually measuring the moving distance of the wire and the number of pulses from the finishing mill's pulse transmitter, even if the roll diameter of the finishing mill changes, it is automatically corrected, eliminating the need for the operator to make corrections and reducing work. The amount can also be reduced accordingly.

[Brief explanation of the drawings] Figure 1 shows a conventional finishing mill with a rolling head and
Figure 2 is a side view (a) and plan view (b) showing the mechanism of the laying head. Figure 8 shows the state of the coil discharged from the laying head onto the conveyor. A plan view, FIG. 4 is a control block diagram showing an example of a conventional device, and FIG. 5 is a block diagram showing an outline of a line of an embodiment of the present invention. In the figure, (NT) is the finishing rolling mill, (LH) is the laying head, (1) is the wire rod, (MDI), (HD2)
, (HD8), (HD4) are material detectors, (
Ml) is the electric motor for driving the finishing rolling mill, (M2) is the electric motor for driving the leifugu head, (PLGI), (PLG2
) is a pulse transmitter, (LS) is a limit switch, (C
TR1), (CTRLA), (CTR2),
(CTR8) is a counter, (Gl) is a gate, (DA
I), (DA2) are digital-to-analog converters, (RHI
), (RH2'), (RH4) are variable resistors, (D
E) shows a biting detection device. Note that the same reference numerals in each figure indicate the same or equivalent parts. Agent Makoto Kuzuno - 1st:,! Figure 2 3Fl

Claims (1)

[Claims] In a device that controls the discharge angle of a laying head that winds and discharges a wire rod coming out of a finishing rolling machine into a ring shape and places it on a conveyor, there is a mechanism that detects that the wire rod is caught in the finishing rolling machine. a first and second material detector installed at a predetermined interval on the exit side of the rolling mill, a first pulse transmitter connected to the finishing rolling machine driving motor, The distance value that the wire moves per pulse is determined by the interval (distance) and the number of pulses generated by the first pulse transmitter within the interval (time) in which the first and second material detectors respectively operate. a first computing device that calculates a pulse that is generated by the first pulse transmitter from when the wire is detected by the biting detector until it reaches the discharge port of the laying hesode; a second calculation device that calculates the tip position of the wire rod as a distance from the biting position of the finishing rolling mill by sequentially multiplying the distances; a second pulse transmitter connected to the leifugu head driving electric motor; The pulse generated by the second pulse transmitter from when the wire is detected by the biting detector until it reaches the discharge port of the laying head is multiplied by a constant value (the distance traveled by the laying head per pulse). Accordingly, an eighth arithmetic unit calculates the distance traveled by the laying head, sequentially counts the pulses generated by the second pulse transmitter, resets the pulses by a limit switch every time the laying head rotates once, and calculates the above counted value. A fourth calculation device calculates the deviation angle of the laying head discharge port from the position based on the limit switch based on the difference with the pulse value of the one-turn light of the laying head, and the deviation angle is calculated by the second calculation device. The distance calculated by the eighth arithmetic device is made equal to the distance calculated by the eighth calculation device, and the deviation angle of the laying head discharge port is determined from when the wire is detected by the biting detector until it reaches the first material detector. and a laying head angle correction device that corrects the rotational speed of the laying head so as to match each target value at each stage between detection by the first material detector and reaching the laying head discharge port. An angle control device for a laying head, comprising: