JPS59150650A - Device for preventing failure in cutting billet - Google Patents

Abstract

PURPOSE:To make a cutting operation thoroughly unmanned without the need for constant monitoring in gas cutting of a billet formed by continuous casting by providing detectors for the uncut part of a billet operating cooperatively with right and left torches and performing retreat of the torches and recutting of the billet. CONSTITUTION:A gas cutter is constituted by providing torches 2, 3 moving an inside direction 4 on a carriage 6 which is advanced by wheels 7 in synchronization with a billet 1 formed by continuous casting. Detectors 9-12 for the uncut part of the billet are attached to supports 25, and speed setters 19-21 and a driving motor 18 are provided respectively to moving devices for the torches. The detectors 9-12 move together with the torches 2, 3 at the cutting speed set by the setter 19 upon starting of cutting. When the optical axis of the detector through which the cutting groove of the billet 1 passes detects the uncut part, the corresponding torch is once retreated at the retreat speed set by the setter 21 and cuts again the billet at the low speed set by the setter 20. The unmanned cutting operation is thus made possible without the need for constant monitoring.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a slab cutting failure prevention device for a gas cutting machine of continuous casting equipment.

[Technical background of the invention and its problems]

The gas cutting machine of the continuous casting equipment is a device that cuts slabs into regular lengths, and as shown in Fig. 1, the right soft pipe 2 and the left soft pipe move independently in the inner direction 4 and the outer direction 5, respectively. 3, a right soft pipe 2, and a left soft pipe 3 are placed on it, and a slab 1 is loaded on it, and the trolley 6 moves forward with wheels 7 (:).

When a cutting start signal is output from the length measuring device (not shown) to the gas cutting machine, the cart 6 of the gas cutting machine moves downstream from the standby position in synchronization with the slab l, and after the cutting is completed. Return to standby position. During this time, the right soft tube 2 and the left soft tube 3 blow out gas and oxygen to cut into the slab from the left and right outside in the inward direction 4, and proceed to the cutting completion point, after which the left and right soft tubes return to the outside direction 5, respectively. , Next cutting 1: Prepare.

When cutting, especially when cutting into the end face of a cast slab, uncut parts of the cast slab may be left uncut, which occurs frequently because the surface has already cooled and become hard. This is the cutting speed of the soft pipe,
The amount of gas and oxygen, the temperature and material of the slab, etc. are related.

Conventionally, in order to prevent this and take action in the event that uncut material occurs, the operator constantly monitors the cutting process and manually adjusts the speed of the blowpipe during operation, so the cutting speed tends to be set low. This has the disadvantage that operation is slowed down and that an operator must constantly monitor cutting.

OBJECTS OF THE INVENTION] In view of the above-mentioned drawback 1, an object of the present invention is to provide a failure prevention device for cutting slabs that can be unmanned during cutting.

Embodiment of the Invention] An embodiment of the invention will be described below with reference to FIGS. 2, 3, and 4.

The present invention consists of the following: That is, a photoelectric detector 9 for detecting uncut slabs is attached to the outside of each of the right soft pipe 2 and the left soft pipe 3 so that it can be moved together with the left and right blowpipe.
10 and 11.12 (to be precise, 12 is the emitter and 9.11 is the receiver) and the emitter of the photoelectric detector with respect to the support 25 and the transition device of the right soft tube 2 and the left soft tube 3, respectively. , a soft pipe cutting speed setting device 19, a contact point 22 that closes during cutting, a correction speed setting device 20 for lowering the blowing rod speed during re-cutting after detecting uncut slabs, and detecting uncut slabs. A contact point 23 that is closed when the pipe is recut later, a blow rod retraction speed setter 21, a contact point 24 that is closed for a certain period of time when the soft pipe is retracted, the aforementioned soft pipe cutting speed setter 19 and correction speed setter 20. A power source 17 which inputs the signal from the blowing rod backward speed setting device 21 and outputs a signal proportional to the setting speed (===) of each setting device, and a blowing rod shifting electric motor 18 whose speed changes in proportion to the signal from this power source 17. It consists of

Now, when cutting is started with the left and right blowpipe, the contact 22 is closed and the photoelectric detectors 9.10 and 11.12 are set in the inner direction 4 with the soft pipe cutting speed setting device 19 along with the blowpipe 2.3. The optical axes of the photoelectric detectors 9°lO and 11.12 are located in the groove (approximately 10° wide) of the slab cut by the blowpipe.
move through the.

If there is an uncut portion, the uncut portion 16 will block the light 26 from the photoelectric detector's projector 10, and the uncut portion will be detected by the photoelectric detector (2). The signal opens the contact 22 of the blowing rod transfer device on the side left uncut, and closes the contact 24.If the contact 24 of B is the contact that becomes the contact after being closed for a certain period of time, the blowpipe on the side left uncut will be closed. , the blowpipe moves backward for a certain period of time, that is, by a certain distance, at the speed set by the blow rod retraction speed setting device 21. After that, when the contact point 23 is closed, the blowpipe moves back at the speed set by the blow rod movement speed setting device 19. Since re-cutting is started at a speed lowered by the speed set by the correction speed setting device 20, it becomes possible to cut the slab without leaving any uncut parts.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to completely unattend slab cutting work using a gas cutting machine without constantly monitoring the slab cutting operation, and it is possible to achieve completely unmanned slab cutting work using a gas cutting machine. If you set it high, you can get .

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional gas cutting machine, Fig. 2 is a front view of a gas cutting machine showing an embodiment of the present invention, Fig. 3 is an electric circuit diagram showing an embodiment of the present invention, and Fig. 4 is a front view of a conventional gas cutting machine. FIG. 3 is a diagram showing a state in which uncut portions are detected according to an embodiment of the present invention. l...Slab 2...Right soft pipe 3...Left soft pipe 4...Inner transfer direction 5...Outer transfer direction 6...Gas cutting machine trolley 7...Gas cutting machine trolley Wheel 8...Rail 9...Photoelectric detector for right soft tube 10...Photoelectric detector for right soft tube 11...Photoelectric detector for left soft tube [2...Photoelectric detector for left soft tube Detector 13...Roll 14...Roll bearing 15
...Wheel for transferring the blowing rod 16...Uncut area 17.
...Power source 18...Electric motor 19...Blow rod speed setting device 20...Speed setting device for blow rod correction 21.
... Blow rod backward speed setting device 22.23.24 ... Contact 25 ... Floodlight support 26 ... Optical axis (731
7) Agent Patent attorney Kensuke Chika (and 1 other person) Figure 1, Nippon Toy b- JP-A-59-150650 (3) Figure 3'□'

Claims (1)

[Claims] In a gas cutting machine installed in continuous casting equipment, a photoelectric detector is installed on each of the left and right soft tubes and works in conjunction with the soft tube to detect uncut portions of the slab. A first setting section that stops the blowpipe and moves it in the opposite direction when the blowpipe is detected, and a first setting section that moves the soft pipe in the thickness direction again after the blowpipe has moved in the opposite direction. and a second setting part for setting the slab, and when the photoelectric detector is activated, the first setting part and the second setting part are activated to prevent uncut slabs from being left uncut. A device to prevent failure in cutting slabs.