JPS647020Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for removing slag (burr) that adheres to the cutting position of a steel material after cutting.

In recent years, with the significant progress in rolling technology, steel mills have started cutting continuously cast steel materials such as slag into appropriate lengths on a conveyor path, and sending these cut steel materials directly to rolling at high temperatures. The process is adopted.

In the above process, when the cut steel material (hereinafter simply referred to as steel material) is obtained, slag adheres to the lower end of the cut surface, but the steel material is sent to the next rolling process without sufficiently removing this slag. When rolled, the slag causes defects in the product and damages the rolling rolls.

Therefore, conventionally, the above-mentioned slag removal was
This is done by first removing the steel material from the conveyance path, placing it on a stand or the like with the slag adhering surface facing up, and manually scraping off the slag using a cutting tip or the like.

However, this method has problems in reducing the number of man-hours, such as the inability to automate the line, the time it takes to remove slag, and the need to secure workers.

This invention was developed as a result of various studies in order to develop a device that automatically uses gas flame to remove slag from steel materials that are placed on a roll conveyor (conveyance path) and transported without using human hands. We focused on issues such as:

In other words, (a) If slag is removed using a conventional gas cutting nozzle, a thin secondary slag will be generated around the cutting area after the slag has been removed, which will interfere with the next rolling process. Become. This is because the flame ejection angle of the melting nozzle relative to the slag adhesion surface of the steel material is somewhat larger than the appropriate angle for removing slag in hot conditions. This is thought to be because it adheres to the surface and hardens to form secondary slag. (b) Also, in order to automatically remove slag through the cutting nozzle, the cut steel material is transported by a roll conveyor with the cut portion parallel to the transport direction and with the slag adhering surface facing upward; It is judged to be optimal to position the melting nozzle above and remove the slag adhering to both sides of the steel material (parallel to the conveyance direction). It is not always possible to place the cut part on the roll conveyor so that it is exactly parallel to the conveyance direction, and it is not always possible to place the cut part on the roll conveyor with the cut part tilted to the conveyance direction (position deviation within 40 mm at the edge of the steel material). It often happens that the items are placed and transported as they are.
Therefore, the slag removal section (steel material end) on one side is located close to the melting nozzle, and the slag removal section (steel material end) on the other side is located away from the melting nozzle.
Therefore, during the preheating process that is carried out just before melt removal, the slag removal section that is farther away from the melt removal nozzle is not sufficiently preheated and is then suddenly melted away. . Therefore, slag removal is incomplete, resulting in inconvenience.

The present invention is a slag removal device that eliminates the above-mentioned drawbacks, that is, there is no generation of secondary slag due to excessive cutting when removing slag by melting, and the steel material is transported with the roll conveyor loading position disordered. As a result of intensive experiments and studies to develop a slag removal device that can fully preheat the ends of steel materials to which slag adheres and completely remove the slag, we have come to the following knowledge. Ivy.

(a) In order to eliminate the generation of secondary slag due to excessive cutting, field experiments were repeated with various flame ejection angles from the cutting crater, and as shown in Figure 1, slag adhesion to steel material 1 was observed. Surface (horizontal surface) 1a
When the angle θ of the melting nozzle 2 is set to 25° ± 2.5° from the conventional angle of the melting nozzle 30° to 35°,
It was confirmed that there was no excess or deficiency in melt cutting, and that the slag 3 could be sufficiently removed.

(b) In addition, in order to prevent uneven preheating of slag, a detector is installed inside the main body of the slag removal device to detect the tip of the conveyed steel material, and in addition to receiving detection signals from these detectors, A control device for supplying a drive signal to the wheel drive device based on the detection signal is provided in the main body of the device. Then, prior to cutting the slag, the preheating flame is injected from the cutting nozzle, and the distance is pre-inputted.
By repeatedly rotating the wheels in the forward and reverse directions, in other words, by repeatedly moving the main body of the device back and forth at the front end of the steel material on the side where the melting starts.
The area around the slag starting point to be welded can be sufficiently preheated, and then the slag can be removed by welding by moving the device and performing the fusing operation while injecting the fusing flame from the fusing nozzle as before. It has been confirmed that it can be done.

This idea was made based on the above findings. This invention will be explained below with reference to the drawings. Figures 2 and 3 show an embodiment of the slag removal device according to this invention, and in the figures, reference numeral 4
shows a roll conveyor (conveyance path) that transports the steel material 1 after cutting, with the cut parts 1b and 1c located on both sides, and with the slags 3a and 3b attached to the cut parts 1b and 1c facing upward. It is.
On both sides of this roll conveyor 4 are rails 5a, 5.
The slag removal device of this invention runs on these rails 5a and 5b.

The slag removal device of this invention has the above-mentioned rail 5.
an arch-shaped device main body (movable frame) movably placed on wheels 6a, 6b on a, 5b;
7, and movable tables 8a, 8b in the center of this device main body 7.
The melting nozzles 2a and 2b are respectively attached via the heads 2', and these melting nozzles 2
a, 2b for switching the flame ejected from the fusing nozzles 2a, 2b into a preheating flame and a fusing flame (not shown); position detector 9a,
9b and a control device 10. Note that the wheels 6a and 6b are driven by drive devices 11a and 11.
These wheels 6a, 6b and drive devices 11a, 11b constitute a traveling device 12.

The detectors 9a and 9b are set to detect the leading end of the steel material 1 being conveyed. These detectors 9a and 9b are connected to the control device 10, and are set to supply a detection signal to the control device 10 when the tip of the steel material 1 is detected.
Further, this control device 10 includes the drive device 11a,
11b and the melting nozzles 2a and 2b.

Furthermore, this control device 10 includes a preheating condition setting means (not shown), a preheating running control means (not shown), a preheating completion detecting means (not shown), and a cutting running control means (not shown). ). The preheating condition setting means is capable of inputting a distance L that is longer than the distance l of the positional deviation of the steel material 1 in the conveying direction, and the number of times the apparatus main body 7 is reciprocated toward the steel material 1 by the distance L. be. The preheating travel control means detects the steel material 1 from the detectors 9a and 9b.
In response to the detection signal, the flame switching means is switched so that a preheating flame is ejected from the fusing nozzles 2a, 2b, and the apparatus main body 7 is switched according to the distance L and the number of reciprocations input to the preheating condition setting means. The driving devices 11a, 11
b. The preheating completion detection means is
The end of preheating is detected when the number of reciprocating movements of the apparatus main body 7 reaches the number of reciprocating movements input to the preheating condition setting means. The cutting traveling control means switches the flame switching means so that the cutting flame is ejected from the cutting nozzles 2a and 2b in response to the preheating end signal from the preheating end detection means, and the apparatus main body 7 switches the cutting flame to the steel material. The driving devices 11a and 11b are controlled so that the vehicle passes over the vehicle.

Further, in this invention, the fusing nozzles 2a and 2b are attached to the head 2' of the fusing nozzle on the movable table so that the flame jetting angle is 25°±2.5°. As a result, the excess or deficiency of fusing is corrected, and as shown in Fig. 1, the area S where the flame covers the horizontal plane, that is, the slag adhesion surface 1a, is larger than before because the angle θ of the fusing nozzle is reduced. Therefore, the preheating effect is improved accordingly.

According to the slag removal device having the above configuration, the flame ejection angle of the melting ports 2a and 2b is
Since it is set at 25° ± 2.5°, it is possible to carry out melt cutting with just the right amount, sufficient slag removal, and the generation of secondary slag can be prevented, and the slag preheating effect can be slightly increased. be able to. Furthermore, the detectors 9a, 9b and the control device 10
Since the preheating operation can be performed before the melt removal operation, even if the cut parts 1a and 1b of the steel material 1 transported by the roll conveyor 4 are not parallel to the transport direction, they can be left behind. The slags 3a and 3b of the steel material 1 can be removed by melting without any melting.

In the above example, the melting nozzle is located above the roll conveyor, and the slag is located on the top surface of the conveyor so that it can handle the steel material being conveyed. In the case where the steel material is transported in such a way that the melting hole is located below the roll conveyor, this invention does not prevent this.

As explained above, in the slag removal device according to this invention, the flame ejection angle of the cutting nozzle with respect to the slag adhering surface of the steel material is set to 25° ± 2.5°, and the ejection flame is preheated at the cutting nozzle. A flame switching means for switching between a flame and a cutting flame is provided, a position detector for detecting the conveying tip of the steel material is provided in the main body of the apparatus, and the position detector, the traveling device, and the cutting flame are connected to the A control device for controlling preheating and cutting of the slag is connected, and the control device includes preheating condition setting means for setting the amount of movement and the number of reciprocating movements of the cutting tip to the steel material during preheating, and the position Based on the detection signal of the steel material from the detector, the flame switching means is switched so that the flame ejected from the cutting crater becomes a preheating flame, and the amount of movement and the number of reciprocations are set by the preheating condition setting means. a preheating traveling control means for driving and controlling a traveling device so that the fusing nozzle eventually moves; and a preheating traveling control means for controlling a traveling device so that the fusing nozzle moves, and an end of preheating when the number of reciprocating movements of the fusing nozzle reaches a set value of the preheating condition setting means. Based on the preheating completion detection means and the preheating completion signal from the preheating completion detection means, the flame switching means is switched so that the flame ejected from the cutting nozzle becomes a cutting flame, and the apparatus main body is switched over the steel material. Since it is equipped with a cutting traveling control means that drives and controls the traveling device so that the traveling device passes through the belt, there is no generation of secondary slag, and even if the steel material is conveyed with the roll conveyor mounting position disordered. , the slag can be sufficiently preheated and the slag can be completely melted away.

[Brief explanation of the drawing]

Fig. 1 is a diagram for explaining the flame ejection angle of the cutting crater, Figs. 2 and 3 show an embodiment of this invention, Fig. 2 is a plan view, and Fig. 3 is a front view. It is. 1...Steel material, 1a...Slag adhesion surface, 1a, 1
b... Cutting part, 2, 2a, 2b... Melting crater, 3
a, 3b...Slag, 6a, 6b...Wheel, 9
a, 9b...Position detector, 10...Control device, 1
1a, 11b...drive device, 12...travel device,
l...Displacement distance, L...Preset distance, θ
...Flame ejection angle of the cutting crater.

Claims (1)

[Claims for Utility Model Registration] The slag of a steel material that is cut in a continuous fusing process and is conveyed so that both cut portions on which slag is generated and adhered are substantially parallel to the conveying direction on a conveying path is ejected by flames. In the slag removal device, the slag removal device includes a fusing nozzle for removing slag from the steel material, and a main body of the device that supports the fusing nozzle and runs on the conveyance path by a traveling device having the slag. The flame ejection angle with respect to the surface is set to 25° ± 2.5°, the fusing nozzle is provided with a flame switching means for switching the ejected flame to a preheating flame and the fusing nozzle, and the apparatus main body is provided with a flame switching means for switching the ejected flame to a preheating flame and a fusing nozzle. A position detector that detects the tip is provided, and a control device that controls preheating and cutting of the slag is connected to the position detector, the traveling device, and the melting nozzle, and the control device , a preheating condition setting means for setting the amount of movement and the number of reciprocating movements of the melting nozzle to the steel material during preheating; and the flame ejected from the melting nozzle being preheated by the detection signal of the steel material from the position detector. Preheating traveling control means for switching the flame switching means so as to produce a flame, and driving and controlling the traveling device so that the cutting tip moves according to the amount of movement and the number of reciprocating movements set by the preheating condition setting means. and a preheating end detection means for detecting the end of preheating when the number of reciprocating movements of the fusing nozzle reaches a set value of the preheating condition setting means; and a preheating end signal from the preheating end detection means; A cutting traveling control means that switches the flame switching means so that the flame ejected from the cutting crater becomes a cutting flame, and drives and controls the traveling device so that the device main body passes over the steel material. A slag removal device characterized by: