JPS6130313A - Controlling method and device for centering steel belt in side trimming - Google Patents

Abstract

PURPOSE:To largely contribute to reduction of labor by forming an automatic centering means of a steel belt in side trimming in such a manner as manual operation of side trimming is required only at the time of changing width. CONSTITUTION:The captioned device is composed of upper and lower cutter edges 3a, 4a of a driving side side trimming device 2a, upper and lower cutter edges 3b, 4b of an operational side side trimming 2b, photoelectric type meandering quantity detector 5 or the like. Since a side guide 20 is directly connected to a cylinder 17 and the action of the cylinder 17 is set so as to move in the direction to eliminate the meandering quantity of a steel belt 1, the edge of said belt 1 is automatically adjusted to be always positioned in the center of the detector 5. The detector 5 is provided in the vicinity of the upper cutter edges 3a, 3b and lower cutter edges 4a, 4b of the side trimming devices, and is further set shifting mechanically by as much as T2 in the lateral direction of the steel belt, therefore, trimming margine T1 comes to be the same as the shifted quantity T2. Thus, much can be contributed to reduction of labor.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is capable of automatically performing side trimming of both edges of a continuously threaded steel strip using a site dreamer device having a fixed trimming blade. The present invention relates to a steel strip automatic centering control method and device.

[Prior Art] In a metal strip processing line, such as an annealing and pickling line for steel strips, side trimming work is performed to remove edge cracks from the steel strip or to finish the steel strip to a desired smoothness. This is performed by a side trimming device that shears the steel strip in the longitudinal direction using a rotary shear (hereinafter referred to as side trimming) disposed on the drive side and operation side of the steel strip threading line.

FIG. 1 is a schematic plan view showing the relationship between a side trimming device and a centering device, and the prior art will be explained with reference to this figure.

2a and 2b indicate side trimming devices on the drive side A and the operation side B. 3a and 4a indicate an upper blade and a lower blade of the drive-side trimming device 2a. 3b and 4b indicate an upper blade and a lower blade of the operating side trimming device 2b. Now, when trying to trim the steel strip 1 with a width of W to a width of W2, it is necessary to trim by a width of W, -W. This amount is generally around 20 dragons, and for one edge, the trimming amount is half that, around 101 dragons.

The steel strip that runs through the line usually meanderes 20 to 30 am to the left and right with respect to the line center CL, and the operator of the side trimming device should be aware that the driving side trimming T and the operating side trimming T2 are almost the same. The side guide 20 installed on the entry side of the side trimming device while monitoring to ensure that the
An adjustment operation was performed using the cylinder 17 to move the entering steel strip 1 to the driving side A or the operating side B.

[Problems to be Solved by the Invention] However, this operation by the operator requires considerable skill and must be performed as needed.

In the above-mentioned adjustment operations, if an adjustment failure such as a delay in operation or excessive adjustment occurs, the following problems occur.

(b) A state in which the trimming of only one edge of the steel strip side gradually increases and the trimming of the opposite edge decreases, and even if the trimming of the edge on the opposite side decreases, the trimming from the steel strip continues. It's fine as long as it's completely separated, but eventually the trimming that can't be removed is bent and remains on the steel strip, and in the end, one edge is only trimmed and the opposite edge is completely trimmed. Any situation in which it is not done is a bad situation for number ID trimming, and you will be forced to take measures as described below, or you will end up with bad results.

(b) Occurrence of inefficient and unsafe work such as stopping the line or reducing the line speed to remove unremovable trimmings from the steel strip, stopping the line and redoing the trimming adjustment operation, and redoing the same steel strip. Occurrence of trimming work.

(c) The initial target (predetermined) steel strip product width cannot be secured.

Defects at the edge of the steel strip remain on the product, and in particular, edge cracks that should not remain are not removed, resulting in product quality abnormalities.

There are various problems such as a decrease in line work efficiency, a decrease in manufacturing yield, increased wear and tear on trimming blades and an increase in the frequency of replacement, and an increase in manufacturing costs.

The present invention provides side trimming of a steel strip that is continuously passed through a metal strip processing line, for example, an annealing and pickling line for steel strips.
Automatic centering eliminates the above-mentioned conventional problems and automatically performs side trimming even if there is a slight meandering in the steel strip by adjusting the adjustment only when changing the target trimming width of the steel strip. The present invention seeks to provide a method and apparatus thereof.

[Means for solving the problem] This will be explained with reference to FIGS. 1 and 2. FIG. 2 is a side view showing the relationship between the steel strip edge and the detector. □ The method for controlling the centering of a steel strip in side trimming according to the present invention is such that when the strip width WI of the continuously threaded steel strip 1 is side trimmed to a predetermined @W, the centering control method is symmetrical to the line center CL and at a predetermined width. The meandering amount of the steel strip edge in the vicinity of the side trimming cutter set to the width is detected, and this detected value is input and output in this order to the amplifier 8 and the electric oil quantity converter 9 to convert it into an oil quantity according to the detected value. The operating direction and amount of operation of the side guide cylinder 17 are controlled by the amount of oil, and the side guide 20 disposed close to the front surface of the side trimming cutters 3a, 3b, 4a, 4b is linked to the movement of the cylinder. This is what I did. Further, the steel strip centering control device for side trimming according to the present invention includes side trimming cutters 3a and 3b.

4a and 4b; a detector 5 for detecting the meandering amount of the steel strip edge in the vicinity of 4a and 4b; an amplifier 8 for performing a proportional integral operation on the electric signal obtained by the detector 5; and an electric signal value output from the amplifier 8. Due to this, both piston chambers 21 of the cylinder 17
, 22;
It consists of a side guide cylinder 17 that operates according to the amount of oil sent from the electric oil amount converter 9, and a side guide 20 that centers the steel strip 1 using the cylinder 17.

[Example] The explanation will be based on the drawings.

1 is a rope strap; 2a and 2b are side trimming devices disposed on both sides of the rope strap 1, that is, on the driving side A and the operating side B; 3a and 4a;
are the upper and lower blades of the drive-side side trimming device 2a, 3
b and 4b are upper and lower blades of the operating side trimming device 2b. 5 is attached to either one of the side trimming devices 2a, 2b (drive-side side trimming device 2a in the figure) and a side trimming cutter (cutler 3a in the figure).
, 4a), and is a photoelectric steel strip edge meandering amount detector provided on the untrimmed side of the steel strip 1.

This meandering amount detector 5 is set to be shifted outward by T in the width direction of the steel strip with respect to the trimming position N for ensuring a predetermined width of the steel strip product. The shift amount T ma is the meandering amount detector 5
Any amount can be selected by changing the position of .

The photoelectric meandering amount detector 5 has a light receiver 6 and a light emitter 7 arranged above and below the steel strip l. 8 is an amplifier that receives the signal obtained by the photoreceiver 6. If the photoreceiver 6 is a commonly used silicon photodiode, only positive voltage is generated, so 1/2 of the maximum voltage generated by the photoreceiver 6 is set as the negative bias voltage of the amplifier 8. Add it to 8.

The output signal of amplifier 8 is transmitted to electric oil quantity converter 9 .

Electric oil quantity conversion 'a9 is the injection pipe 1 to which the pressure oil 10 is sent.
1 is rotatably supported by a shaft 12. A setting spring 13 is attached to the middle of the injection pipe 11, and the injection pipe is configured to be rotated by a moving coil 14. The tip of the injection pipe 11 faces two receiving holes 15 and 16. Side guide cylinder 1
7 consists of a cylinder body 18 and a piston 19, and the receiving holes 15 and 16 are connected to both chambers 21 and 22 of the piston 19 in the cylinder body 18, respectively.

Therefore, when the tip of the injection tube 11 approaches the receiving hole 15, the piston 19 moves backward, and when the tip of the injection tube 11 approaches the receiving hole 16, the piston 19 moves forward. The side guide 20 is a piston 19, that is, a side guide cylinder 17.
is connected to.

[Effect] The operation of the present invention will be explained according to the order of operation.

FIG. 3 is a graph showing the relationship between the amount of deviation e and the output V of the detector.

Any detector 5 may be used as long as it can detect the movement of the edge of the steel strip with a resolution of about one fin. FIG. 4 is a circuit diagram of the amplifier 4, showing the signals V, and (2) from the light receiving section. The bias signal v1 of /2 is input to the amplifier, and the amplifier performs "proportional + integral operation". The input/output relationship in this amplifier 8 is V. If `` is the output of the amplifier, then = K (V. - V, ) + dt, and K' are constants representing the proportional gain and integral gain, respectively. The output signal is input to the electric oil quantity converter 9.

Figure 5 shows the input/output characteristics of the electric oil quantity converter 9, and the output Q
(12/min > represents the amount of oil flowing into the side guide cylinder 17. Therefore, the direction and amount of operation of the cylinder 9 are controlled according to the signal amount and polarity of ``. Since the side guide 20 is directly connected to the cylinder 17, the meandering amount is
This is the meandering amount of the cylinder 17.

That is, the side guide 20 is directly connected to the cylinder 17, and the cylinder 17 moves in a direction that eliminates the meandering amount of the steel strip 1 (deviation amount e between the center of the detector and the edge of the steel strip). The edge of 1 is automatically adjusted so that it is always located at the center of detection ``a5''.
Since the trimming T is set to be shifted by the amount T in the width direction of the steel strip plate, the trimming T is the same as the amount of shift T, and it is possible to perform constant trimming.

According to the present invention, since it is controlled so that T=T, the trimming margin can be freely set by changing the position of the detector 5 and changing the shift amount T.

[Effect of the invention] The effects of the present invention will be listed below.

(1) Manual side trimming is required only when changing the width, greatly contributing to labor savings.

(2) Trimming will no longer be 0, contributing to quality improvement and performance improvement.

(3) Trimming can be reduced and yield is improved.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view showing the relationship between the side trimming device and the centering device, Fig. 2 is a side view showing the relationship between the steel strip edge and the detector, and Fig. 3 is the relationship between the steel strip edge eccentric position and the output of the detector. Graph showing the relationship between , Figure 4 is the circuit diagram of the amplifier,
FIG. 5 is a graph showing the relationship between input and output of the electric oil quantity converter. 1 Steel strips 2a, 2b Side trimming devices 3a, 3b
Upper blades 4a, 4b Lower blade 5 Detector 6 Light receiver 7 Emitter 8 Amplifier 9 Electric oil quantity converter 10 Pressure oil 11 Injection pipe 12 shaft 13 Setting spring 14 Moving coils 15, 16 Receiving hole 17 Cylinder 1B Cylinder body 19 Piston 20 Side guide 21 Piston retreat side chamber 22 Piston forward side chamber A Drive side B Operation side W+ Width W2 of steel strip before trimming
Width CL of steel strip after trimming Line center T, Drive side trimming T1 Operating side trimming N Trimming position Vs Negative bias voltage vo Amplifier input vj Amplifier output

Claims (1)

[Claims] 1. When side trimming the width of a continuously threaded steel strip to a predetermined width, the steel strip in the vicinity of a side trimming tool set symmetrically to the line center and at a predetermined width. The amount of meandering of the edge is detected, and this detected value is input and output in that order to an amplifier and an electric oil quantity converter to convert it into an oil quantity according to the detected value.The operating direction of the side guide cylinder and its operation are determined by this oil quantity. A method for controlling the centering of a steel strip in side trimming, characterized by controlling the amount of the centering of a steel strip in side trimming, and interlocking the movement of the cylinder with a side guide disposed close to the front surface of the side trimming cutter. 2. A detector that detects the meandering amount of the steel strip edge near the side trimming cutter, an amplifier that performs a proportional integral operation on the electrical signal obtained by the detector, and a cylinder that uses the electrical signal value output from the amplifier. an electric oil quantity converter that adjusts the amount of oil sent to both chambers of the piston; a side guide cylinder that operates according to the amount of oil sent from the electric oil quantity converter; and a side guide that centers the steel strip with the cylinder. Centering device for steel strip in side trimming.