JPS58119447A - Operating method of conveying table of continuous casting installation - Google Patents

Abstract

PURPOSE:To avert the approaching of a preceding ingot and a succeeding ingot to each other and to eliminate troubles such as resticking by melting, deformation, etc. by driving the table rolls of a conveying table at the speed equal to a drawing speed until the cutting of the ingot is completed and driving the same at a high speed after the completion of said cutting. CONSTITUTION:In the stage of operating a conveying table 5 of a continuous casting installation, table rolls 5a are rotated synchronously with the driving of pinch rolls 9-11 until the cutting of a cut ingot 1a is completed and the completion signal is outputted with a time lag. Then, the spacing between the preceding ingot 1a and a succeeding ingot 1b is maintained at the initial cutting clearance L. When the detection signal for the completion of the cutting is emitted, the table rolls are rotated at a high speed. Thereafter, the driving of the rolls 5a is changed over to the speed equal to the casting speed. The respective rolls 5a are driven with independent electric motors connected to a control device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an example of an operating method for a conveying table of a continuous casting facility, and in particular, it reduces the phenomenon of over-extrusion caused by subsequent slabs during cutting, and prevents deformation and re-welding of cut slabs. We propose a technology that can advantageously overcome these problems.

Fig. 1 shows the pattern of cutting a slab, in which cutting is started by driving a pair of cutting torches 2.18 from both ends of the slab 1'' in the width direction so that they approach each other; stomach)
When an uncut portion of width l is left in the center: In other words, both torches 2.8 collide at this position, so limit switch 4
When a and 4b are activated, (b) one of the torches 8 moves forward and continues the cutting operation, but the other one retreats and returns to the standby position, and then the actual operation is carried out with safety in mind so that there is no uncut material left. Even after passing the cutting completion point, the torch 8
advance and then output a cutting completion signal (c).
l・□ Cutting is performed through each process O Therefore, the feature of this cutting is that the cutting completion signal is output after a certain period of time has passed after the actual cutting is completed.
Width I as a safety factor to prevent one slab from being left uncut! . Since the cutting operation is continued for an extra period of time corresponding to , there is a time lag between the actual completion of cutting and the output of the completion detection signal.

If there is the above-mentioned time lag, the cast slab 1 is placed on the transfer table 5 at the female bath stand, as recently the casting speed has reached 9.5 m 1 m 1 m. Moreover, when the table roll 5a is not yet driven, the tip of the following slab 1b collides with the tail end of the cut slab 1a, causing troubles such as re-welding and deformation. Ta.

In short, this phenomenon is caused by the fact that the casting speed has increased and the transport table 5 is configured as an idle roll until the cut slab 1a is taken out, and then switched to a drive during transport. To,
The following slab 1b extends at the following slab drawing speed to the preceding slab 1a whose movement has stopped due to separation.
This occurs because the time lag approaches abnormally.0 This invention was developed for the purpose of observing the problems of the prior art described above, and changes the method of driving the conveyance table. This method prevents the above-mentioned rear-end collision phenomenon from occurring even when high-speed continuous casting is performed. The details of the configuration will be explained below.

FIG. 2 is a side view of the continuous casting machine, in which 61 is a tundish, 7 is molten steel, 8 is a mold, 9° 10.11 are pinch rolls, and 12 is a cutting machine. A conveying table 5 consisting of a plurality of table rolls 5a is located behind the cutting machine 12. Details of the conveying table 5 and the cutting state of the slab 1 are shown in FIG. 3.

This invention does not operate the above-mentioned conveyance table 5 as an idle roll when not driving for unloading as in the conventional case, but operates at the same speed as the slab pulling speed by the hinge rolls 9 to 11 during cutting. In this method, the cutting slab 1a is rotated at a high speed in order to carry out the cut slab 1a.

To explain this in more detail, even after the cutting of the cut slab 1a is completed, the table roll 5a is not driven by the pinch rolls 9 to 11 described above until a signal indicating the completion is output after a time lag. The rotations are made in sync to maintain the gap between the preceding cut slab 1a and the following slab 1b at the original cutting gap, so that the two slabs 1a and 1b do not come close to each other. 1. Then, when a detection signal indicating completion of cutting is output, the apparatus is configured to carry out high-speed rotation conveyance operation as in the conventional case. Thereafter, in response to a signal indicating completion of unloading, the table roll 5a is driven at a constant speed as the casting speed. In order to perform the drive control described above, each table roll 5a... is driven by an independent electric motor, and the electric motor is equipped with a selector for determining which of the two speed control methods described above to operate, and A control device i that controls commands to the selector such as the position of the cutting machine 12 when cutting is completed, etc. etc. will be provided.

Next, a preferred embodiment of the present invention will be described based on FIG. 4. The drive device includes a synchronized operation speed control device 15. which is used to synchronize the drive of the table rolls 5a... with the drive of the pinch rolls 9-11. Conveyance operation speed control device 16 used for drive control during unloading, selection for selecting whether to drive the motor M-Ml 4 connected to each roll in either synchronized operation or conveyance operation. It mainly consists of a selector command control device 17 for outputting one command signal to the selector according to the position signals of the cutters 18 and 19 degree cutting machine. The control devices 15 and 16 are speed controllers A and 16, respectively.
A', current phase shift controller B;

B', main circuit thyristors c, c',
Further, TG shown in the figure indicates the speed detector 11.

The synchronized operation speed control device 15 operates the motors M□ to M connected to the table roll 5a at the same speed as the slab drawing speed before completion of cutting, and the speed reference is the pinch speed. Use roll speed performance. The conveyance operation speed control device 16 is used when conveying the cut slab 1a after cutting to the next process, and normally operates at a constant speed. Until the cutting completion signal is output, all the motors are operated at a synchronized operating speed by the control device 15, and at the same time as the cutting completion signal is output, the motors on the next process side of the cutting completion point perform conveyance operation, and then the next process When the transfer is completed, synchronized operation is performed again. Even after the cutting completion signal is output, motors located closer to the pinch roll than the cutting completion point continue synchronous operation. M8
To w-(Sw ↓ and MSw'~M.

1 4
The command to the selector 1aw' is determined by the control device based on conditions such as the cutting completion position.

According to the present invention having the configuration as explained above, even in high-speed continuous casting, there is no possibility that the preceding cut slab and the following slab come close to each other, and therefore rear-end collisions can be avoided, so that it is possible to avoid repeated collisions. Problems such as welding and deformation can be resolved.

[Brief explanation of the drawing]

Figure 1 (a) to (c) are explanatory diagrams of each process of slab cutting, Figure 2 is a route map of the continuous casting machine, Figure 3 is a perspective view showing the pattern of slab cutting, and Figure 4 is FIG. 3 is a block diagram of drive control. ■...Slab, la...Preceding cut slab, 1b...Following slab ζ2.8...Cutting torch, 4a, 4b...Limit switch, 5...Transport table, 5a... ... table roll, 6 ... tundish, 7 ... molten steel,
8...Mold, 9.10. ．． DESCRIPTION OF SYMBOLS 11... Pinch roll, 12... Cutting machine, 15... Synchronized operation speed control device, 16... Conveyance operation speed... degree control device, 17...
Selector command control device, 18.19... Selector, M...
・Moheta, L...Cutting clearance, lCt: Width to prevent slab uncut. Patent applicant: Kawasaki Steel Corporation

Claims (1)

[Claims] 1. When operating the lower conveyance table of the cutting device where there is a time lag between the time of cutting completion and the output of the cutting completion signal, the table roll of the above conveyance table is in a pinch from the start of cutting by the cutting torch until the output of cutting completion signal No. 1g. The roll is driven at the same speed as the slab drawing speed, and then the cut slab □“□
A method for operating a conveying table of continuous casting equipment, characterized in that the table roll supporting the table roll is driven at a conveying speed.