JPH0871629A - Device for controlling tip end position of wire in laying head - Google Patents

Abstract

PURPOSE: To provide the device for controlling precise position while a unit pulse distance is determined by a present material without using measured results in a previous material. CONSTITUTION: Wire detectors 2, 3, 4 are arranged at comparatively short distances L1 , L2 apart from each other at a discharging port of a finishing mill and two places in front of the port; the tip end position S1 of the wire is operated on the basis of the detected output of the first and second wire detectors 2, 3 and the transmitted pulse of a pulse transmitter 7; and the tip end position S2 of the wire is operated on the basis of the detected output of the first and third wire detectors 2, 4 and the transmitted pulse of a pulse transmitter 7. The tip end position S1 of the wire is used until the wire reaches the position of the third wire detector 4, the tip end position S2 is used after the wire reaches the position of the third wire detector 4, and the tip end position of the wire is thereby controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire rod tip position control device for a laying head which drops a wire rod discharged from a finishing rolling mill into a ring shape by a laying head and drops the wire rod at a predetermined position on a conveyor.

[0002]

2. Description of the Related Art In a wire rod facility, a wire rod after finish rolling is formed into a ring shape by a laying head, drops on a conveyor, and then is conveyed while being cooled on the conveyor. As a measure for preventing the wire rod conveyed on the conveyor from being caught, tip position control is performed in which the laying head is accelerated / decelerated and the wire rod is dropped so that the tip of the wire rod is located at a fixed position on the conveyor.

Therefore, in order to obtain the tip position of the wire, the tip position of the next wire is controlled by using the unit pulse distance calculation value of the previous material, that is, the wire travel distance per unit pulse, so that the size of the wire is changed. When performing the above, the first tip immediately after the size change could not perform appropriate tip position control because there was no previous material to be used as a reference.

Therefore, conventionally, the tip position is not automatically controlled only for the first size-changed wire, but the tip-end position is controlled manually, but recently all wire rods including the first size-changed wire are cut for labor saving. There is an increasing need for automation.

An example of a conventional tip position control device will be described with reference to FIG.

In FIG. 2, the wire rod Q passes through the finish rolling mill 1 and advances to the laying head 6. The leading end of the laying head 6 is adjusted by the drive motor 19. A pulse transmitter 7 is attached to the finish rolling mill 1, and a wire rod detector (hereinafter referred to as “HM” is provided on the output side of the finish rolling mill 1.
2), and the HMD 5 is arranged at the entrance of the laying head 6. The pulse transmitter 7 outputs the number of pulses according to the traveling distance of the wire rod Q discharged from the finish rolling mill 1. When the tip of the wire rod Q discharged from the finish rolling mill 1 reaches the HMD2, the HMD2 is turned on,
Similarly, when the tip of the wire rod Q reaches the HMD5, the HMD5 is turned on.

First, in the unit pulse distance calculation circuit 8,
The moving distance per pulse for the front material, that is, the unit pulse distance P _F1 [mm / Pulse] is measured in advance in HMD2.
And the distance L ₃ [mm] between the HMD 5 and the pulse count value P of the previous material between the HMD 2 ON and the HMD 5 ON
_It is calculated by the following formula according to ₁ .

P _F1 = L ₃ / P ₁ (1) This unit pulse distance P _F1 is stored in the memory circuit 18, and is output as the unit pulse distance P _FP of the previous material when the tip position of the next material is calculated. .

The distance L ₃ is at most about 50 m, and the wire Q is transported at a high speed of 100 m / s depending on the thickness, depending on the thickness.

Now, the wire rod Q this time starting from HMD2
The tip position S ₁ [mm] of the unit is the unit pulse distance P _FP [mm / Pulse] measured by the front material in the tip position calculation circuit 9 and stored in the memory circuit 18, and the pulse transmitter 7 after the HMD 2 is turned on. The output pulse value P ₂ can be calculated by the following equation.

S ₁ = P _FP × P ₂ (2) A pulse generator 12 is attached to the drive motor 19, and the angle calculation circuit 13 calculates the current angle θ _P of the laying head 6 according to the output pulse value. It

Using the present laying head angle θ _P , the wire rod tip position S ₁ calculated by the tip position calculation circuit 9, and the distance L ₄ from the HMD 2 to the laying head 6, the wire rod Q is used as the laying head 6. The estimated angle θ _E when the angle reaches is calculated by the estimated angle calculation circuit 14.
The predicted angle θ _E obtained by the predicted angle calculation circuit 14 is compared with the target angle θ _T by the comparison circuit 15, and the difference Δ
The speed correction circuit 16 obtains the speed correction value v _c according to θ. The line speed v given in advance is used as the speed correction value v
_{It is} corrected by _c and is controlled so that the tip of the wire rod Q falls to a fixed position on a conveyor (not shown) via the drive motor 19 and the laying head 6.

[0013]

However, in such a tip position control device, since the unit pulse distance P _FP of the previous material is used for _obtaining the tip position of the wire Q, the first tip immediately after the size change. The position control cannot be performed with the wire rod.

As described above, in the method of using the unit pulse distance P _FP of the previous material as the tip position control device, the position control cannot be executed by the first line immediately after the size change, so that conventionally, the position control immediately after the size change is performed. Only for the first wire, a method of manually correcting the tip position of the wire rod on the conveyor was adopted.

The present invention has been made in consideration of the above circumstances, and it is an object of the present invention to provide a tip position control device for performing position control while obtaining a unit pulse distance according to a current material without using a measurement result of a previous material. It is intended.

[0016]

In order to achieve the above-mentioned object, the present invention provides a tip of a steel wire rod which drops a wire rod discharged from a finishing rolling mill into a ring shape by a laying head and drops it at a predetermined position on a conveyor. A position control device,
A pulse transmitter that emits a number of pulses according to the traveling distance of the wire rod discharged from the finish rolling mill, and a discharge port arranged at a relatively short distance between the finish rolling mill discharge port and two points in front of the discharge port. First, second and third wire rod detectors, and first tip position calculating means for calculating the wire rod tip position based on the detection outputs of the first and second wire rod detectors and the pulse generated by the pulse transmitter, Second tip position calculating means for calculating the tip position of the wire based on the detection outputs of the first and third wire rod detectors and the pulse output from the pulse oscillator, and the wire rod is the third
Until the wire rod detector position is reached, using the calculation result of the first tip position calculating means, and after the wire rod reaches the third wire rod detector position, using the calculation result of the second tip position calculating means. And a control means for controlling the tip position of the wire rod in the laying head.

The first tip position computing means computes a wire rod travel distance per unit pulse based on the detection outputs of the first and second wire rod detectors and the pulse output from the pulse oscillator. A distance between the first and second wire rod detectors, a calculation result of the first unit pulse distance calculation device, and a pulse transmitter transmission after the detection output of the second wire rod detector is generated. The pulse may be used to calculate the wire rod tip position.

The second tip position calculating means calculates a second unit pulse distance per unit pulse based on the detection outputs of the first and third wire rod detectors and the pulse output from the pulse oscillator. A calculation means is provided, and the distance between the first and third wire rod detectors, the calculation result of the second unit pulse distance calculation means, and the transmission of the pulse transmitter after the detection output of the third wire rod detector is generated. The pulse may be used to calculate the wire rod tip position.

[0019]

According to the present invention, the wire rod tip position is obtained from the unit pulse distance currently measured in the material, and the laying head is accelerated and decelerated according to the expected discharge angle calculated from the distance to the laying head discharge port. Match the discharge angle to the target angle. If the measurement distance of the unit pulse distance in the current material is lengthened, the measurement accuracy is improved but the control start is delayed too much. Therefore, in the present invention, the unit pulse distance calculation is performed twice at a relatively short point, the control is started immediately using the first calculation result, and the accurate control is started using the second calculation result. In this way, it is possible to harmonize the control delay with the improvement of the accuracy of the unit pulse distance, and it is possible to realize the position control with the highest possible accuracy, with the least possible delay in starting the control.

[0020]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. The difference from the one shown in FIG. 2 already described is that HMD3, HMD4, unit pulse distance arithmetic circuit 1
0, and the tip position calculation circuit 11 is newly added, and the storage circuit 18 is deleted. In FIG. 1, the same or corresponding parts as those in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted. The HMD3 is located at a distance L _{1 in} front of the HMD2, and the HMD4 is located at the HMD4.
It is arranged at a distance L _{2 which} is relatively close to the position further forward than 3.

The wire rod Q passes through the finish rolling mill 1 and the unit pulse distance P _F1 [mm / Pulse] is calculated in the unit pulse distance calculation circuit 8 in the HMD 2 to HMD 3 at a relatively short distance from the HMD 2 ON to the next HMD 3 ON. Using the distance L ₁ [mm] between them and the pulse count value P ₁ of the pulse oscillator 7 between HMD 2 on and HMD 3 on, it is tentatively calculated by the following equation.

P _F1 = L ₁ / P ₁ (3) The control of the tip position is started from the time when the HMD 3 is turned on.

The wire tip position S ₁ from the HMD3 on is
The unit pulse distance P _F1 obtained by the arithmetic circuit 8 using relatively short distance data, the pulse count value P ₂ after the HMD3 is turned on, and the distance L ₁ between HMD2 and HMD3.
Is calculated by the following equation in the tip position calculation circuit 9.

S ₁ = L ₁ + P _F1 × P ₂ (4) On the other hand, when the HMD 4 is turned on, the unit pulse distance P _F2 between the distances (L ₁ + L ₂ ) is set in the unit pulse distance calculation circuit 10 to the HMD 2 ON- Using the pulse count value P ₃ for a relatively long distance interval between the HMD 4 ONs, it is obtained with relatively high accuracy by the following equation.

P _F2 = (L ₁ + L ₂ ) / P ₃ (5) Using this unit pulse distance P _F2 and the pulse count value P ₄ after the HMD ₄ is turned on, the wire rod tip position S ₂ after the HMD ₂ is turned on Is calculated by the following equation in the tip position calculation circuit 9. S ₂ = L ₁ + L ₂ + P _F2 × P ₄ (6) Wire rod tip positions S ₁ and S obtained as described above
Both ₂ are introduced into the expected angle calculation circuit 14. The predicted angle calculation circuit 14 uses the wire rod tip position S ₁ tentatively detected at a relatively early time until the HMD 4 is turned on, but thereafter the wire rod tip position S detected at a relatively high accuracy at a relatively late time. Used by switching to ₂ . In this way, it is possible to realize position control with relatively high accuracy using only the detection data of the material itself that is currently flowing. The operation after the comparison circuit 15 is performed in the same manner as described with reference to FIG.

[0027]

As described above, according to the present invention,
By using the current material to detect the unit pulse distance and controlling the tip position of the wire rod without using the unit pulse distance data of the previous material, position control can be applied to all wire rods including those immediately after size change. Therefore, it is possible to eliminate the manual work of correcting the tip position of a part of the wire material (the first wire immediately after the size change).

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a tip position control device according to the present invention.

FIG. 2 is a block diagram showing a conventional tip position control device.

[Explanation of symbols]

 1 Finishing rolling mill 2-5 Wire rod detector 6 Laying head 7,12 Pulse transmitter 8,10 Unit pulse distance arithmetic circuit 9,11 Tip position arithmetic circuit 13 Angle arithmetic circuit 14 Expected angle arithmetic circuit 15 Comparison circuit 16 Speed correction Circuit 17 Speed control circuit 19 Driving motor for laying head Q Wire

Claims (3)

[Claims] 1. A wire rod tip position control device for a laying head, which drops a wire rod discharged from a finish rolling mill into a ring shape by a laying head and drops the wire rod at a predetermined position on a conveyor. A pulse transmitter that emits a number of pulses according to the traveling distance, and first, second and third wire rods arranged at relatively short distances from each other at the finish rolling mill discharge port and two points in front thereof. A detector, a first tip position calculating means for calculating the tip position of the wire based on the detection outputs of the first and second wire detectors and the transmission pulse of the pulse transmitter; and the first and third wire detectors. Second tip position calculating means for calculating the tip position of the wire based on the detection output of the pulse generator and the pulse output from the pulse transmitter, and the first until the wire reaches the position of the third wire detector.
Control for performing the tip position control of the wire rod in the laying head using the calculation result of the second tip position calculation means after the wire has reached the third wire rod detector position. And a wire rod tip position control device for a laying head. 2. A first unit for calculating a wire rod travel distance per unit pulse based on the detection outputs of the first and second wire rod detectors and the pulse output from the pulse oscillator. A pulse transmitter having pulse distance calculating means, a distance between the first and second wire rod detectors, a calculation result of the first unit pulse distance calculating means, and a pulse output after the detection output of the second wire rod detector is generated. 2. The wire rod tip position control device according to claim 1, wherein the wire rod tip position is calculated by using the transmission pulse of. 3. A second unit for calculating a wire rod travel distance per unit pulse based on the detection outputs of the first and third wire rod detectors and the pulse output from the pulse oscillator. A pulse oscillator having pulse distance calculation means, a distance between the first and third wire rod detectors, a calculation result of the second unit pulse distance calculation means, and a pulse transmitter after detection output of the third wire rod detector is generated. 2. The wire rod tip position control device according to claim 1, wherein the wire rod tip position is calculated by using the transmission pulse of.