KR100966809B1 - Device for controlling the speed of cutting using the oxygen sputter in cutting the slab of a continuous caster - Google Patents

Abstract

In the present invention, in the cutting speed adjusting device of the slab, the cutting oxygen detection plate is fixed to the upper portion of the detection plate attachment ring, the lower portion is fixed via a balancing weight connection bracket, the detection car shaft is loosely fitted to the detection plate attachment ring. A plurality of detection switches installed at angles on switch mounting brackets are fixed at both ends of the detection shaft and the switch detection bar is pivotally fixed to the cutting oxygen detecting vehicle and the detection vehicle moving pipe in which a bearing is inserted. Cut off oxygen detection during cutting slab cutting, characterized in that the switch detection bar is moved according to the movement of the cutting oxygen detection plate by the steel wire penetrates through the sensor unit and the balance weight hole and the upper hole of the switch detection bar. Provided is a cutting speed adjusting device.

According to the present invention, by preventing the uncut portion of the slab and providing a slab having a good cutting surface to the post-process, the plate defect factor during post-process rolling is prevented in advance, thereby improving the cutting efficiency.

Slab, Cutting, Oxygen, Detection Car, Proximity Switch

Description

Device for controlling the speed of cutting using the oxygen sputter in cutting the slab of a continuous caster}

1 is a cutting slab cutting state diagram of a conventional cutting machine,

2 is a perspective view of the cutting nozzle when cutting the slab,

3 is a flow diagram of the cutting oxygen during slab cutting,

4 is an exploded view and an assembly view of the device of the present invention,

5 is an installation state diagram of the cutting machine of the present invention,

6 is a functional diagram of the device of the present invention,

7 is a slab cutting flow chart of the present invention,

8 is a conventional slab cutting flow chart.

♣ Explanation of symbols for main part of drawing ♣

100: cutting oxygen detection difference 200: sensor

1: cutting oxygen detection plate 2: detection plate attachment ring

3: sensing car shaft 4: counterweight connecting bracket

5: balance weight 6: sensing car driving bearing

7: fixing pin 8: steel wire                 

9: switch detection bar 10: switch detection bar pin

11: steel wire fixing bolt 12: switch fixing bracket

13 detection switch 14 detection car moving pipe

15: sensing plate coolant line 16: sensing car driving track

20: cutting burner 21: cutting nozzle

22: cut oxygen 23: preheating gas

24: cutting burner coolant 25: burner running motor

30: slab 31: slab cutting surface

32: uncut portion 40: slab feed roll

41: roll mounting frame

The present invention relates to a technology for preventing a phenomenon in which the slab is not partially cut due to a high cutting speed when cutting hot and cold slabs using a cutting machine in a continuous casting process of an iron making plant. The present invention relates to a cutting speed adjusting device using cutting oxygen detection that senses an angle and reduces cutting speed before an uncut portion of a slab occurs.

When cutting the conventional slab, uncut portions often occur, which often causes a large increase in the defect rate in the post process. The situation in which the uncut portion of the playing slab occurs will be described with reference to the drawings.

1 is a state diagram of cutting slab of the conventional cutting machine.

The cutting machine includes a cutting burner 20 equipped with a cutting nozzle 21 emitting a cutting oxygen 22 for cutting the slab 30, a cutting burner cooling water line 24 and a cutting burner 20 connected to cool the cutting burner. ) Is composed of a travel motor 25 for moving left and right. In the figure, you can see the work of cutting two cutting machines towards the center on both sides.

Typically, when cutting the slab 30 cast in the machine in the hot and cold state, the cutting speed is set within the range of 35 to 500 mm / min according to the equipment specifications of the slab 30 and the experience of the operator. However, according to various conditions such as the temperature, thickness of the slab 30 or the state of the cutting burner, various gas pressures, and foreign matter mixed in the slab 30, it is necessary to adjust the cutting speed accordingly. It is a reality.

2 shows an embodiment of the cutting nozzle 21, in which the cutting oxygen 22 at a pressure of about 14 to 17 bar is formed at the center of the cutting nozzle 21 of the cutting burner 20 through the cutting oxygen hole 22-2. It comes out and the preheating gas 23 comes out through the preheating gas hole 23-1. The figure shows an embodiment in which the preheating gas holes 23-1 are in one or two rows.

3 is a flow diagram of the cleaved oxygen 22.

(A) of FIG. 3 is a normal cutting state, and the cutting oxygen 22 maintains a straight state, and (b) the cutting oxygen speed is gradually increased, and the angle of the cutting oxygen 22 at the lower end of the slab 30 is increased. It is a situation where the uncut portion 32 is to be generated slightly as it is opened at an angle of 0 to 30 degrees, and (c) shows that the cut oxygen portion 22 at the lower end of the slab 30 has an angle of 30 to 60 degrees, so that the uncut portion 32 is completely formed. (D) is an angle of the cutting oxygen 22 at the lower end of the slab 30 is expanded to 60 ° or more so that the scale 22-1 generated when cutting the slab 30 is scattered to the upper slab 30. It is a situation in which cutting is impossible in such a state.

That is, in the related art, when the cutting speed is appropriate, the slab 30 is accurately cut, but when the cutting speed is high, the slab 30 is uncut and the scale 22-1 generated during cutting is upper part of the slab 30. This can be confirmed by the operator to reduce the cutting speed. However, when the scale 22-1 generated during cutting is scattered to the upper portion of the slab 30, the partial uncut portion 32 is already generated in the lower portion of the slab 30.

When the uncut portion 32 of the slab 30 is generated, the worker goes out to the site using a crane, and lifts one side of the slab 30 up and down repeatedly forcibly cutting or re-cutting, which increases the difficulty.

In addition, the generation of the uncut portion 32 of the slab 30 results in plate failure during rolling, which is a post-process due to the poor cutting surface, and decreases the cutting efficiency of the cutting machine, re-cuts when the uncut portion is generated, and forcibly cuts using a crane. In case of poor cutting surface, it causes a problem that the work load increases to the worker, such as the problem of scarfing using the hand torch.

On the other hand, the slab uncut prevention detection device of the domestic patent application 10-2001-36020 detects only the uncut that occurs at the beginning of the initial cutting to generate an alarm for the operator to know that the operator can start cutting again, It is not a technology that can not respond to the uncut state of the slab that is generated at all, and it is a technology that can only follow-up after the uncut occurs, not a technology that can prevent uncut in advance.

The present invention has been made in order to solve the technical problem as described above, the cutting oxygen 22 having a pressure of about 14 to 17 bar coming out through the cutting nozzle 21 when cutting the uncut portion 32 of the slab (30) generation Previously, a cutting speed adjusting device is manufactured and installed in a new concept, thereby automatically reducing the cutting speed, thereby preventing the occurrence of the cutting portion 32 of the slab 30 in advance.

 In the present invention, in the slab cutting speed control device, the cutting oxygen detection plate is fixed to the upper portion of the detection plate attachment ring, the lower portion is fixed via a balancing weight connection bracket, the detection car shaft is loosely fitted to the detection plate attachment ring. A plurality of detection switches installed at angles on switch mounting brackets are fixed at both ends of the detection shaft and the switch detection bar is pivotally fixed to the cutting oxygen detecting vehicle and the detection vehicle moving pipe in which a bearing is inserted. Cut off oxygen detection during cutting slab cutting, characterized in that the switch detection bar is moved according to the movement of the cutting oxygen detection plate by the steel wire penetrates through the sensor unit and the balance weight hole and the upper hole of the switch detection bar. Provided is a cutting speed adjusting device.

In addition, there is also provided a cutting speed adjusting device using a cutting oxygen detection when cutting slab cutting slab characterized in that to prevent the thermal deformation of the cutting oxygen detecting plate by spraying on the cutting oxygen sensing difference by installing a coolant line in the sensing difference moving pipe. do.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

Figure 4 is an exploded view and assembly view of the cutting speed adjusting device using the present inventors cut oxygen detection.

4 (a) is a configuration of the cutting oxygen detection difference 100, the detection plate attachment ring (2), the balance weight connection bracket (4) and the balance weight (5) in a straight line center on the cutting oxygen detection plate (1) Weld and fix accordingly. Insert the sensing shaft (3) into the sensing plate attachment ring (2). At this time, the sensing plate attaching ring (2) and the sensing shaft (3) should be loosely fitted to make smooth rotation, but not too much flow. do. This is a necessary part for the precise detection of the cutting oxygen 22. Then, the fixing pin 7 is inserted into the shaft pinhole 3-1 of the sensing vehicle shaft 2 to prevent the left and right flow of the sensing plate attachment ring 2. On both sides of the sensing car shaft 3, the sensing car driving bearing 6 is assembled by interference fit.

In the configuration of the sensor unit 200 (b), the switch detection bar 9 is inserted into the switch detection bar pin 10 so as to be rotatable, weld-fixed to the detection difference movement pipe 14 and the switch mounting bracket 12 Also, the welding of the switch detection bar 9 is fixed to the welding range. Proximity switches 13 and 13-1 are provided in the switch mounting bracket hole 12-1 of the switch mounting bracket 12.

Then, the steel wire 8 is inserted into the counterweight hole 5-1 of the cut oxygen detecting vehicle 100 and the upper hole 9-2 of the switch sensing bar 9 of the sensor unit 200, and is connected to the steel wire fixing bolt. Insert into hole (11-1) of (11) and fix with nut (11-2).

(c) is an assembly view of the device of the present invention is connected to the cutting burner 20 and the sensing car moving pipe 14 by the sensing car moving pipe 14 connected when the cutting burner traveling motor 25 is moved. Go with it.

In some cases, the sensing plate coolant line 15 is installed along the side of the sensing difference moving pipe 14 to be connected to the coolant line 24 of the cutting burner 20 to be cut by the coolant 15-1. To prevent thermal deformation of the oxygen detecting plate (1).

5 is an installation state diagram of the cutting machine of the present invention. The sensing vehicle traveling bearing 6 is inserted into the sensing vehicle traveling track 16 and installed to move on a rail, and the sensing vehicle traveling track 16 is welded and fixed to the roll installation frame 41.

The operation of the apparatus of the present invention configured as described above will be described below with reference to the drawings.

6 is a perspective view of a device portion of the present invention, and (a) to (d) show a conceptual diagram in which the device of the present invention operates.

In FIG. 6A, the cut oxygen detecting plate 1 of the cut oxygen detecting difference 100 is maintained at a right angle by the counterweight 5 in a normal cut state.

In (b), when the cutting oxygen 22 angle at the lower end of the slab 30 reaches 30 °, the cutting oxygen detecting plate 1 is pushed backward by the pressure of the cutting oxygen 22 and is switched by the steel wire 8 connected thereto. The detection bar 9 is pulled at this time, and the switch detection bar 9 contacts the primary proximity switch 13 to generate a signal. By this signal, the cutting speed is reduced to 30 to 40%. When the primary proximity switch 13 contact is released, the cutting speed is increased to the normal cutting speed previously input to the program.

In (c), when the cutting oxygen 22 angle at the lower end of the slab 30 becomes 60 ° or more, the secondary proximity switch 13-1 is contacted to generate a signal. By the program pre-input by this signal, the initial cutting speed (typically 60 to 70% of the normal cutting speed) is reduced, the contact of the secondary proximity switch 13-1 is released, and the primary proximity switch 13 is closed. When activated, it is reduced to the terminal cutting speed (typically 30 to 40% of the normal cutting speed).

As shown in (d), when the contact of the primary proximity switch 13 is released, the speed is increased at the normal cutting speed. When the cutting speed is delayed due to the detection of the cutting oxygen of the detection difference 100, the cutting state returns to the normal state, and the cutting oxygen 22 that acts on the cutting oxygen detecting plate 1 without generating the uncut portion 32 of the slab 30 is not generated. Since the pressure of the cutting oxygen detecting plate 1 is maintained at a right angle again by the counterweight (5).

In addition, when the cutting speed continues to drop abnormally, the operator may go to the site and check the status of various equipment to take abnormal measures to maintain the normal state of the equipment.

7 and 8 are a working process diagram according to the present invention and the conventional method, respectively.

The present invention further includes the step of automatically decreasing the speed by using the proximity sensor as described above compared to the conventional method.

Therefore, according to the present invention to prevent the slab (30) uncut portion 32 by the detection plate 1 of the cutting oxygen detection difference 100 in advance to block the plate defect factors during the post-process rolling to a good cutting surface, When the uncut portion 32 of the slab 30 is generated, there is an effect of preventing the load of the worker, such as re-cutting, deterioration in cutting efficiency due to forced cutting using a crane, and scarring using a hand torch due to poor cutting surface.

Claims (2)

In the cutting speed adjusting device of the slab, Cutting oxygen detecting plate (1) is fixed to the upper portion of the detection plate attachment ring (2), the counterweight (5) is fixed via the counterweight connecting bracket (4) at the bottom, A sensed oxygen detecting vehicle 100 in which a sensing vehicle shaft 3 is loosely fitted to the sensing plate attachment ring 2, and bearings 6 are forcibly fitted at both ends of the sensing vehicle shaft 3;  The switch sensing bar 9 is fixed to the sensing difference moving pipe 14 so as to be rotatable, and a plurality of sensing switches 13 and 13 installed at angles in the switch mounting bracket 12 fixed to the sensing difference moving pipe 14. A sensor unit 200 consisting of -1); The steel wire 8 penetrates through the hole 5-1 of the counterweight 5 and the upper hole 9-2 of the switch sensing bar 9 to be connected to each other. Cutting switch control device using the cutting oxygen detection during cutting slab, characterized in that the switch detection bar (9) to move in accordance with the movement of the cutting oxygen detecting plate (1). The method according to claim 1, Cutting oxygen during cutting slab cutting slab characterized in that to prevent the thermal deformation of the cutting oxygen detecting plate 1 by spraying the coolant line 15 in the sensing difference moving pipe 14 and sprayed on the cutting oxygen detecting difference (100). Cutting speed adjusting device using detection.

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