JP3324495B2 - Gas cutting equipment for continuous casting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas cutting device for a continuous casting facility, and more particularly to a gas cutting device capable of easily adjusting a cutting position of a blowpipe in a slab moving direction.

[0002]

2. Description of the Related Art A slab produced by a continuous casting machine is cut into a predetermined length while moving, usually by a gas cutting device which moves in synchronization with a casting speed.

[0003] The gas cutting device comprises a blow pipe for cutting the slab from the side end in the width direction by the heat of the frame, an elevating guide bar for supporting the blow pipe, and a guide roll for guiding the guide bar up and down. And a guide.

In general, when cutting a slab by the above gas cutting device, two gas cutting devices are synchronized with the moving slab, and are positioned at both side ends of the slab. Move and cut with the heat of the frame.

However, in the blowpipe, the cores of the cutting frames from the left and right blowpipe easily shift due to thermal deformation due to radiant heat from the high-heat slab and adhesion of the cutting stick to the nozzle.
If a gap occurs in the core, a step is formed in the cut surface at the center of the slab, which leads to an increase in crops in the next step. Also,
In severe cases, it cannot be cut. For this purpose, various countermeasures have been taken against deviation of the core of the cutting frame.

[0006] Generally, a shim is attached to a blow pipe mounting portion to adjust the position of the frame or to replace the blow pipe.

On the other hand, Japanese Patent Application Laid-Open No. Hei 9-150262 discloses an image obtained by photographing the lower surface of a slab using a monitoring camera when cutting the slab from the upper surface side using a gas torch. And monitors the state of the frame blown out from the blowpipe, and adjusts the position of the blowpipe so that the state of the frame becomes normal. Here, when the blowpipe is defective, the blowpipe is retracted in the reverse direction to re-cut the poorly cut slab.

[0008]

However, in the above-mentioned prior art in which a shim is mounted on the blow pipe mounting portion to adjust the position of the frame, the gas cutting machine must be shut down for a long time, and casting cannot be performed during that time. There is a problem.

On the other hand, in the technique disclosed in Japanese Patent Application Laid-Open No. Hei 9-150262, the surveillance camera is used to photograph the lower surface side of the cast slab, process the obtained image, and change the state of the frame blown out from the blow pipe. Since the temperature at the time of cutting the slab by continuous casting is in a high temperature state of about 600 ° C. to 1000 ° C., it is difficult to bring the monitoring camera close to an appropriate position.

The technique of monitoring the state of the frame from the lower surface side of the slab is based on the fact that when the slab is cut normally, the frame blown out from the blow tube penetrates the slab. If a cutting failure occurs, the frame is blocked inside the slab and sparks are generated. If it is determined to be defective, the height position of the tip of the blowpipe is finely adjusted, the blowpipe is retracted in the opposite direction, and the slab is cut again.

For this reason, it is not possible to appropriately cope with the above-mentioned problem caused by the displacement of the core of the cutting frame.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem caused by the displacement of the core of the cutting frame, and a blow pipe is operated while operating a gas cutting device synchronized with a moving slab. It is an object of the present invention to provide a gas cutting device of a continuous casting facility capable of correcting a deviation of a core of a cutting frame caused by the above.

[0013]

According to the present invention, there is provided a blow pipe which is synchronized with a moving slab and cuts the slab from a side end in a width direction, a guide bar which supports the blow pipe and has a lifting / lowering mechanism,
A fixed guide provided with a guide roll for guiding the ascending and descending of the guide bar, and a gas cutting device for a continuous casting facility, comprising: a position adjusting mechanism in a slab moving direction provided on the guide roll; A gas cutting device for a continuous casting facility, wherein an adjustment mechanism adjusts the position of the blowpipe in the slab moving direction via the guide bar.

According to the present invention, with the above configuration, it is possible to cut the slab by correcting the displacement of the core of the cutting frame by the blowpipe while operating the gas cutting device synchronized with the moving slab.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing an embodiment of the present invention. The gas cutting device 1 of the present invention is used for cutting a slab S manufactured by a continuous casting machine in a continuous casting facility (not shown). In general, when cutting the slab S, the two gas cutting devices 1 are paired and can be moved in synchronization with the casting speed, and are positioned at both side ends of the slab S. 2 is moved from left to right to the center of the slab S by a moving device (not shown), and the slab S is cut in the width direction by the heat of the frame 10.

The gas cutting device 1 comprises a blow pipe 2, a guide bar 3 for supporting the blow pipe 2, and a fixed guide 5 having guide rolls 4a and 4b for guiding the guide bar 3 up and down.

A commercially available blow pipe 2 is used, and oxygen necessary for cutting a slab is blown out from a nozzle 6. The blowpipe 2 is fixed to a blowpipe mount 7, and the blowpipe mount 7 is fixed to a lower end of the guide bar 3 by a fixture 8.

The guide bar 3 has a rectangular shape, and has a V-shaped groove M provided in the fixed guide 5 as described later.
a (upper guide roll) and the guide roll 4 b (lower guide roll), and the fixed guide 5 is moved up and down by the cylinder 9. The guide rolls 4a and 4b are each formed of a pair of guide rolls so as to sandwich the guide bar 3, as described later.

The guide roll 4a has a position adjusting device 11
Is provided, and the guide roll 4a is moved so that the V-shaped groove M
Can be moved in the slab moving direction.

When the position of the groove M is moved in the slab moving direction, the guide bar 3 engaged with the groove M moves in the slab moving direction synchronously and is fixed to the lower end of the guide bar 3. The blow pipe 2 moves in the slab moving direction via the blow pipe mount 7.

Here, the movement driving device 11 is provided on the guide roll 4a, but the present invention is not limited to this, and the movement drive device 11 may be provided on the guide roll 4b for raising and lowering the guide bar 3 as appropriate.

Reference numeral 24 denotes a clevis fixing pin, and the guide bar 3 and the cylinder 9 are moved in accordance with the movement of the guide roll 4a.
The axial direction of the clevis fixing pin 24 is adjusted so that the joining portion of the clevis and the mounting portion of the cylinder 9 to the fixing guide 5 bend freely in the moving direction of the guide roll 4a.

According to the present invention, the cut surface of the slab S is constantly measured by a displacement measuring device, which will be described later, and the position of the guide roll 4a is adjusted by remote control based on the measured result. Is adjusted. for that reason,
The position of the cutting frame 10 of the blowpipe 2 can be adjusted without stopping the operation.

Next, the mechanism constituting the present invention will be described in detail. FIG. 2 is a view showing an embodiment of a guide roll moving mechanism used in the present invention.

The guide roll 4a is a roll having a V-shaped groove M. Thereby, the square-shaped guide bar 3 can be prevented from swinging when it comes into contact with the V-shaped groove M and moves up or down or when cutting.

The guide roll 4a is fixed to the moving sleeve 13 via a bearing 12 by a snap ring (shaft retaining ring) 14a and a flange 15 at the tip of the moving sleeve. The fixed shaft 16 is supported and fixed by a fixed shaft support member 17 and a fixed guide 5. The fixed shaft 16 is provided with a stepped portion 18, and an intermediate gear 19 is rotatably provided on the fixed shaft support member 17 via a bearing 20. A part of the main body is inserted into the end of the moving sleeve 13 and integrally joined by screws 21. Reference numeral 32 denotes a nut.

The intermediate gear 19 is meshed with the pinion rack 22, and the movement of the pinion rack 22 causes the intermediate gear 19 to rotate. When the intermediate gear 19 rotates, a rotational force is transmitted to the moving sleeve 13 via the screw 22.
However, since the moving sleeve 13 is stopped by the rotation stopper key 23 and is connected to the fixed shaft 16, the moving sleeve 13 can be moved in the horizontal direction but does not rotate.

As a result, either the moving sleeve 13 or the intermediate gear 19 moves horizontally in the direction of the arrow.
The movement in the horizontal direction is restricted by the stepped portion 18 and the snap ring 14b, so that only the movement sleeve 13 can be moved.

Thus, when the moving sleeve 13 moves horizontally in the direction of the arrow, the guide roll 4a fixed to the moving sleeve 13 also moves.

FIG. 3 is a view showing an embodiment of a drive mechanism for moving a guide roll used in the present invention.

The intermediate gear 19 includes left and right guide rolls 4a.
And fixed to the pinion rack 22. When the motor 25 is driven, the pinion rack 22 moves horizontally in the direction of the arrow via the speed reducer 26, and the intermediate gear 19 rotates.

Here, since the intermediate gear 19 mounted on the fixed shaft 16 of the left and right guide rolls 4a is rotated by one pinion rack 22, it is easily synchronized and rotated by the same amount.

Further, by constantly measuring the position of the moving sleeve 13 with the displacement meter 27 attached to the moving sleeve 13, the position and the moving amount of the guide roll 4a are adjusted.

In the above description, when the guide roll 4a is moved in the axial direction by the movement driving device 11, the guide bar 3 is supported by the guide roll (lower guide roll) 4b at the position of the guide roll 4a in the same direction as the guide roll 4a. To the same amount. The guide bar 3 and the lifting cylinder 9
The connecting portion of the lifting cylinder 9 and the mounting portion of the lifting cylinder 9 to the fixed guide 5 are configured to bend freely in the direction in which the guide roll 4a moves.

Next, the method of correcting the position of the blow nozzle according to the present invention will be described. FIG. 4 is a schematic view of a cut surface of a slab requiring correction, and FIG. 5 is an explanatory diagram of a blow pipe nozzle position correcting method.

When the blow tubes of the two gas cutting devices are moved toward the center from both side ends of the slab S to cut the slab S, the core N of the cutting frame is displaced and one gas cutting device is displaced. The cut surface Sa of the slab S cut by the above and the cut surface Sb of the slab S cut by another gas cutting device have a step difference in the cut surface at the center of the slab S. Assuming that the deviation of the upper surface due to the step of the cut surface is a and the deviation of the lower surface is b, generally b
> A.

When the axis of the upper guide roll is A, the axis of the lower guide roll is B, and the tip of the blowing nozzle 6 is C, the distance between the axis A and the axis B is La, and the distance between the axis B and the blowing nozzle 6 is La. Let Lb be the distance on the horizontal extension of the tip.

Now, the axis B is fixed, and the axis A is
When moved as x, the inclination of the guide bar 3 becomes Ax / L
a.

Since the inclination of the tip of the blow pipe nozzle 6 is considered to be the same as the inclination of the cut surface of the slab S as shown in FIG. 5, when the thickness of the slab S is t, (ba) / t.

Therefore, in order to correct the tip of the blow pipe nozzle, Ax / La = (ba) / t, that is, Ax = La × (ba) / t (1) Then, assuming that the moving amount of the tip of the blowing nozzle is Cy, Cy = Lb × Ax / La (2) or Cy = Lb × (ba) / t (3) Become.

Also, by moving the shaft center B and the shaft center A,
To correct the displacement a at the tip of the blowing nozzle 6, the movement amount A
x, Bx, and assuming that the moving amount of the tip of the blower nozzle is Cy, Ax = Bx = a−Cy = a−Lb × (ba) / t ·
... (4)

FIG. 6 is a view showing a control state of the slab cutting according to the present invention. In order to cut a slab S produced by a continuous casting machine in a continuous casting facility (not shown), two gas cutting devices 1 are paired and moved in synchronization with a casting speed by a tuning device 33 shown by a two-dot chain line. However, it is located at both ends of the slab S.

Here, the blowing pipe 2 of each gas cutting device 1 is
The slab S is moved from the left and right to the center by the moving device 28, and the slab S is cut in the width direction by the heat of the frame 10.

The gas cut surface of the slab S is measured by the displacement measuring device 2
9, the shift amount is constantly observed. When the shift is detected, the adjustment amount of the left and right blow pipes is calculated by the blow pipe position calculating device 31 according to the above equation (1) or (4). The moving amount is calculated so as to be the same, and based on the calculated amount, the position adjusting device 11 of the blowpipe shown in FIG. 1 is driven via the gas cutting position control device 30 to adjust the position of the blowpipe 2. I do.

Therefore, according to the present invention, it is possible to easily correct the deviation between the left and right cut surfaces in a short time without stopping the operation of the gas cutting device and without being affected by severe conditions around the tip of the blowpipe. Can be.

[0047]

As described above, according to the present invention, it is possible to cut the slab by correcting the displacement of the core of the cutting frame by the blowpipe while operating the gas cutting device synchronized with the moving slab. Therefore, it is possible to improve the quality of the cut surface of the cast slab and avoid production stoppage due to defective cutting.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

FIG. 2 is a view showing an embodiment of a guide roll moving mechanism used in the present invention.

FIG. 3 is a view showing an embodiment of a drive mechanism for moving a guide roll used in the present invention.

FIG. 4 is a schematic view of a cut surface of a slab requiring correction according to the present invention.

FIG. 5 is an explanatory diagram of a method of correcting the position of a blowpipe nozzle according to the present invention.

FIG. 6 is a diagram showing a control state of slab cutting according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas cutting device 2 Blowing tube 3 Guide bar 4a, 4b Guide roll 5 Fixed guide 6 Nozzle 7 Blowing tube mount 8 Fixing device 9 Cylinder 10 Frame 11 Position adjusting device 12 Bearing 13 Moving sleeve 14a, 14b Snap ring (shaft retaining ring) 15 Collar 16 Fixed shaft 17 Fixed shaft support member 18 Stepped portion 19 Intermediate gear 20 Bearing 21 Screw 22 Pinion rack 23 Detent key 24 Clevis fixing pin 25 Motor 26 Reducer 27 Displacement meter 28 Moving device 29 Displacement measuring device 30 Gas cutting Position control device 31 blow pipe position calculation device 32 nut 33 tuning device

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Norichika Aramaki 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (56) References JP-A-8-323453 (JP, A) JP-A Sho 49-63637 (JP, A) JP-A-10-113768 (JP, A) JP-A-9-150262 (JP, A) JP-A-57-187170 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B22D 11/126

Claims (1)

(57) [Claims] 1. A blow pipe that is synchronized with a moving slab and cuts the slab in a width direction from a side end, a guide bar that supports the blow pipe and has an elevating mechanism, and a guide that guides the elevating and lowering of the guide bar. A fixed guide provided with a roll, and a gas cutting device of a continuous casting facility provided with a position adjusting mechanism in the slab moving direction provided in the guide roll, the position adjusting mechanism, the guide bar, A gas cutting device for a continuous casting facility, wherein the position of the blowpipe in the direction of movement of the slab is adjusted via the slab.