JP2001179411A - Method for using cutting-off device for continuously cast material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a using method of a cutting-off device for continuously cast material, applied in the case of developing a trouble in a self-positional detector for detecting the position of a carriage, that is the using method of the cutting-off device for continuously cast material, with which the carriage clamping the continuously cast material is synchronously shifted with the shifting of the continuously cast material and the continuously cast material is cut off with a torch engaged with the carriage to make a cast slab. SOLUTION: The positioning of the carriage is performed at the position of a fixed point as a basis for starting the cut-off by using the detector for detecting the shifting amount of the clamped continuously cast material, and the carriage position from the setting point is calculated from an output signal of the above detector.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of using a continuous cast material cutting device for cutting a continuous cast material such as steel into a torch to form a slab, and more particularly, to a method of using a continuous cast material cutting device provided at a bogie position. The present invention relates to a method of using a continuous cast material cutting device that enables continuous cutting of a torch even when a failure occurs in a position detector.

[0002]

2. Description of the Related Art First, a continuous casting facility in a steelmaking process of steel will be described with reference to FIG. Molten steel 15 refined in a converter and other refining facilities is cast into a mold 10 from a tundish 11 via a ladle 12. Then, the shell portion of the surface layer is solidified by the mold 10 and is pulled downward. Drawn continuous cast material 2
Immediately below the mold 10, only the shell part is solidified, the inside remains molten steel, and is pulled out by being constrained by the pinch rolls 3 arranged in parallel. And it solidifies to the inside while being spray-cooled with cooling water. The continuous cast material 2 solidified to the inside is straightened by the straightening device 4, and cut into a desired length by the continuous cast material cutting device 5 to form the slab 1.

Here, the amount of movement of the continuous casting material 2 is calculated from, for example, a signal of a pulse generator 8 attached to a transport roll and used for various controls. In the continuous casting material cutting device 5, as shown in FIG. 1, for example, a clamp 5c fixed to a carriage 5a grips the continuous casting material 2 and moves in synchronization with the moving speed of the continuous casting material 2. The continuous cast material 2 is cut by a flame 5e injected from a torch 5b to form a slab 1 having a predetermined length. here,
The roller table 6 in the moving zone 7 in the continuous casting material cutting device 5 is constituted by a transport roll 6a that can be lowered and retracted, and the transport roll 6a that comes directly below the flame 5e during cutting.
Are controlled so as to descend and retreat sequentially, and the flame 5e
The roll is controlled so as not to be blown or damaged.

[0004] For this control, it is necessary to accurately detect the position of the bogie of the continuous cast material cutting device 5. Cart
For position detection of 5a, a self-position detector 5d such as an ABSOCODER attached to the carriage 5a is usually used. Absocoder 5d can accurately detect the amount of rotation (number of times and angle) of the wheels of bogie 5a, including the direction of rotation in the forward and reverse directions. Can be detected. Therefore, it is possible to accurately output the descending / retreating instruction to the transport roll 6a in accordance with the movement of the carriage 5a.

In order to detect the position of the bogie, a method of counting pulses of a pulse generator attached to an axle or the like is also employed. Here, the carriage 5a is provided with a clamp 5c, which clamps the continuous casting material 2 and
Movement is completely synchronized with the movement. After the cutting is completed, the clamp 5c is released, and the self-propelled
Retreat to position. However, depending on the cutting length of the next slab material, the slab may be started again by clamping again halfway without retreating to the fixed point. Such control is also possible because the absolute position of the bogie can always be accurately grasped by the self-position detector 5d.

[0006]

However, if a failure occurs in the self-position detector or a failure such as a short circuit or poor conduction of the signal line occurs, the position of the bogie cannot be accurately detected, and The transport roll cannot be lowered and retracted in accordance with the movement, and in the worst case, the continuous casting line stops.

Conventionally, in order to avoid this line stop, when a failure occurs in the self-position detector of the bogie, the operator manually lowers and retreats the transport roll while visually checking the torch position to manually cut the slab. And continued operations. However, manual control while visually observing the torch position places an excessive burden on the operator and is likely to cause erroneous operation, which makes it difficult not only to avoid roll damage completely, but also to prevent short cast slabs from falling. Was causing it.

The present invention solves the above-mentioned problems and provides a method of using a continuous cast material cutting apparatus that can continue operation as soon as possible even if a failure occurs in a self-position detector attached to a truck. To provide.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a continuous cast material is transported on a roller table including a plurality of transport rolls capable of retreating, and is loaded on a carriage which moves in synchronization with the continuous cast material. Cutting the continuous cast material by the torch, and retracting the transport roll corresponding to immediately below the torch being cut, based on a detection value of a self-position detector provided on the bogie. In the method of using the apparatus, when a failure occurs in the self-position detector, the bogie position at the time when the bogie starts synchronizing with the continuous cast material, and the moving distance of the continuous cast material after synchronizing. The above problem is solved by a method of using a continuous cast material cutting device, wherein the position of the bogie is calculated based on the calculated value and used as a substitute for the detection value of the self-position detector.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a continuous cast material cutting apparatus includes a bogie 5a which moves in a moving zone 7 in synchronization with a moving speed of a continuous cast material 2, a continuous cast material attached to the bogie. It consists of a torch 5b for fusing the material. Further, a roller table including a plurality of foldable transfer rolls 6a configured so that the torch sequentially descends and retreats when the torch passes directly above the moving carriage 7 in the moving zone 7 of the continuous casting material cutting device. 6 are provided.

The carriage 5a is usually provided with a clamp 5c, which can move in synchronization with the movement of the continuous casting material by clamping the continuous casting material. The movement of the carriage 5a is detected by a self-position detector 5d attached to the carriage, and the detected position signal is used for controlling the lowering and retreating of the transport roll 6a. On the other hand, a slab length measuring device 8 such as a pulse generator is also attached to the transport roll or the pinch roll 3 of the continuous casting material 2, and the movement amount of the continuous casting material 2 is detected.
Based on this detected value, it is used for instructing the clamp 5c to start clamping, determining the passing position of the continuous casting material in the width changing section, and the like.

Here, while the continuous casting material 2 is being cut by the continuous casting material cutting device 5, the movement of the two is completely synchronized because the clamp 5c of the carriage 5a is gripping the continuous casting material 2.
That is, the movement amount of the bogie detected by the self-position detector 5d and the movement amount of the continuous cast material detected by the slab length measuring device 8 are the same. The present invention has been made by paying attention to this point.

If a problem occurs in the self-position detector 5d attached to the truck 5a, the signal of the absolute position of the truck 5a cannot be obtained from the self-position detector 5d. In such a case, the present invention makes it possible to continue cutting the continuous cast material by knowing the absolute position of the carriage 5a as described below. Usually, in order to control the transport and stop positions of the truck, a fixed point 9 serving as a reference point for stopping the truck is provided on the truck transport line. At the fixed point 9, a method of detecting the arrival of the bogie using a sensor or a limit switch or the like and stopping the bogie, a method of providing a mechanical stopper and forcibly stopping the bogie with the stopper, and the like are adopted. In FIG. 1, only fixed points directly related to the present invention are shown, and other fixed points are not shown.

A fixed point 9-1 shown in FIG. 1 is a retreat limit when the carriage 5a retreats, and is also a reference origin when starting to cut the continuous cast material 2. The fixed points 9-2 and 9-3 shown in FIG.
Is an intermediate reference point when stopping and starting cutting when the carriage 5d has retreated. In the application of the present invention, first, after the previous continuous cast material cutting sequence is completed,
5a self-propelled and retreats, the position of fixed point 9 which is the retreat limit
Or, the preselected intermediate reference points 9-2, 9-3
Stop at the position.

Then, when the continuous cast material 2 moves by a predetermined length and a slab cutting position arrives immediately below the torch 5b,
By operating the clamp 5c, the continuous cast material 2 is gripped and starts to move in synchronization with the continuous cast material, and at the same time, the cutting of the continuous cast material 2 is started. Since the fixed point, that is, the position at which the cart 5a starts synchronous movement with the continuous casting material is known in advance, the continuous casting material movement amount measurement such as the pulse generator attached to the transport roll 6 or the pinch roll 3 or the like is performed. By using the output signal of the device 8, the position of the bogie can be grasped, and the position of the torch 5b is calculated and output. By issuing a retreat command to the transport roll 6a based on the position of the torch 5b grasped in this way, even if a failure occurs in the self-position detector that detects the bogie position of the continuous casting material cutting device. Thus, the transport roll 6a can be reliably moved down to the retract position.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Conventionally, when a failure has occurred in a self-position detector attached to a bogie of a continuous cast material cutting device and it becomes difficult to accurately detect the bogie position, an operator performs a process of lowering and retracting the transport roll 6a. It was done manually. Therefore, it is not only difficult to avoid the roll damage due to the operator's erroneous operation, but also a dropping trouble of the short cast piece has been caused.

On the other hand, after the present invention is applied when the operation of the self-position detector attached to the bogie of the continuous cast material cutting device becomes unstable, automatic operation can be continued, and Roll damage and short slab dropping trouble caused by incorrect operation could be eliminated.

[0018]

According to the present invention, it becomes possible to continue the automatic operation of the continuous casting material cutting device even when the operation of the self-position detector attached to the bogie of the continuous casting material cutting device becomes unstable. It is now possible to completely avoid damage to the transport roll due to the flame of the torch.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a continuous cast material cutting device to which the present invention is applied.

FIG. 2 is a side view of a continuous casting facility.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slab 2 Continuous casting material 3 Pinch roll 4 Straightening machine 5 Continuous casting material cutting device 5a Truck 5b Torch 5c Clamp 5d Self-position detector 5e Flame 6 Roller table 6a Transport roll 7 Moving zone 8 Continuous casting material movement measuring device 9 -1, 9-2, 9-3 Fixed point 10 Mold 11 Tundish 12 Ladle 15 Molten steel

Claims (1)

[Claims] The continuous casting material is conveyed on a roller table including a plurality of transport rolls capable of retreating, and the continuous casting material is moved by a torch mounted on a carriage that moves in synchronization with the continuous casting material. A continuous cast material cutting device for cutting off the transport roll corresponding to immediately below the torch being cut, based on a value detected by a self-position detector provided on the carriage. When a failure occurs in the position detector, the bogie position at the time when the bogie starts synchronizing with the continuous cast material, based on the moving distance of the continuous cast material after synchronizing,
A method of using a continuous cast material cutting device, wherein a position of the bogie is calculated and used as a substitute for a detection value of the self-position detector.