JPS59113975A - Detector for defective cutting of billet - Google Patents

Abstract

PURPOSE:To provide a titled device which detects easily and surely a defective cutting part by providing a means for passing a detecting lever in a cutting gap with a delay by a prescribed distance from a cutting torch. CONSTITUTION:A motor 6 is run to lower a base plate 5 until the projecting piece 13 of the plate 5 actuates a microswitch 12 for a lower limit stop so that a detecting lever 4 can pass the inside of a cutting gap l in the stage of cutting a billet 15. The cutting is started and when the lever 4 passing the inside of the cutting gap by tracing a cutting torch 1 comes into contact with a defective cutting part 16, the lever 4 rocks in the direction of an arrow A and the projecting piece 4a of the lever 4 pushes a microswitch 8. The vibration of the lever 4 during detection is prevented by a stopper 9. The torch 1 is moved backward by a distance L through the automatic travelling system of the torch 1 by the signal of said microswitch 8. The part 16 is cut again by the torch, then the torch is moved forward.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting defective cutting of slabs in continuous casting machines and the like.

In continuous casting, in the final step, an automatic cutting machine is moved a certain distance along the flow of the casting line while synchronizing with the line speed, and during this time the slab is cut into a predetermined length by a cutting torch.

At this time, in cases where the line speed is high or in the case of thick plates, the automatic cutting torch may not completely cut the slab and send it out with defective cuts remaining.

This invention was devised in view of the above-mentioned circumstances, and its purpose is to cause a detection lever to pass through the cutting gap after a predetermined distance from the cutting torch, and to determine whether or not this detection lever contacts the defective cut portion. It is an object of the present invention to provide a cutting defect detection device which has a simple structure and easily and reliably detects a defective cutting portion by detecting whether the cutting is complete or incomplete.

The present invention will be explained below with reference to illustrated embodiments.

A cutting defect detection device 2 is attached to a cutting torch 1 of an automatic cutting machine (not shown).

Two cutting defect detection devices, a mounting support plate 3 attached to the side surface of the cutting torch 1, a board that is provided on the mounting support plate 3 so that it can be raised and lowered, and a detection lever 4 at the lower end. 5, and a motor 6 for raising and lowering the board 5.

The substrate 5 is mounted parallel to the cutting torch 1 and guided by a guide K-27 so as to be movable up and down. The substrate 5 has a protruding piece 4a at its upper end, and a microswitch 8 which is swingably pivoted below the protruding piece 4m and is actuated by the 4a, and a microswitch 8 that controls the swinging of the detection lever 4. A stopper 9 for stopping the cutting torch 1 , a rack 10 attached to the end of the cutting torch 1 and extending over the entire longitudinal length of the substrate 5 , a rack 10 attached to the opposite end of the cutting torch 10 , and a rack 10 attached to the opposite end of the cutting torch 1 and provided on the mounting support plate 3 . A protruding piece 13 is provided for operating the detection lever 4 lower limit stop micro switch 11 and the detection lever 4 upper limit stop micro switch 12.

This substrate 5 is attached to the mounting support plate 3 such that the distance between the cutting torch 1 and the detection lever 4 is a minimum value at which the detection lever 4 is not affected by heat from the cutting torch 1. K, which is raised and lowered, is raised and lowered by rotationally driving the pinion 14 that is engaged with the rack 10 by the motor 6.

When cutting the slab 15 using the cutting torch 1 equipped with such a cutting defect detection device 2, the detection lever 4 first detects the cutting gap! The motor 6 is driven to lower the board 5 until the protruding piece 13 of the board 5 activates the lower limit stop microswitch 12 so that the board 5 can pass through the inside.

Next, start cutting and track the cutting torch 1 to create a cutting gap l.
When the detection lever 4 that is passing through the inside comes into contact with the defective cutting portion 16, the detection lever 4 swings in the direction of arrow A, and the protrusion 4a of the detection lever 4 pushes the microswitch 8. At this time, the stopper 9 can prevent the detection lever 4 from vibrating at the time of detection.

In response to the signal from the microswitch 8ON, the position of the cutting torch 1 is reversed by the distance between the cutting torch 1 and the detection lever 4 through the automatic transport system of the cutting torch 1. Then, cut the defective cut portion 16 again and proceed forward.

Next, after normal cutting is completed, the lifting motor 6 is driven by the cutting completion signal to raise the board 5 until the protrusion 13 of the board 5 activates the upper limit stop microswitch 11 (7), which causes the detection lever The lower end of the cutting torch 4 moves with the cutting torch 1 to a fixed position without touching the slab 15, with the upper end on the surface of the slab 15.

(3) This invention can be applied not only to continuously cast slabs but also to general automatic cutting machines.

The present invention has the above configuration and has the following effects.

The device passes through the cutting gap in the same direction as the cutting torch after a certain distance delay, and detects whether or not the detection lever comes into contact with the defective part, allowing for easy and reliable cutting with a simple structure. Defective parts can be detected. Therefore, cutting errors with automatic cutting machines can be prevented without the need for large-scale and complicated equipment.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the defective cutting detection device of the present invention, and FIG. 2 is a schematic perspective view showing the cutting state. 1... Cutting torch 2... Cutting defect detection device 3... Mounting support plate 4... Detection lever 4a... Protruding piece 5... Board 6... Motor 7... Guide roller 8... Micro switch 9... Stopper 10...Rack (4) 11...Upper limit stop microswitch 12Φ・Lower limit stop microswitch 13...Protrusion 14.e pinion 15...Slab
16...Poor cutting area A...Arrow L...Distance!
... Cutting gap.

Claims (1)

[Claims] A detection lever having a length equal to or greater than the thickness of the slab is provided so as to be able to track the cutting torch through the cutting gap at a minimum distance interval that will not be affected by heat from the slab cutting torch. A device for detecting defects in slab cutting.