JPS6121161Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gas cutting device for cutting continuously cast slabs (hereinafter referred to as continuous slabs) into predetermined dimensions.

FIGS. 1 and 2 are a longitudinal sectional view and a transverse sectional view showing an example of the gas cutting device. In the figure, reference numeral 1 denotes a continuously cast piece that is continuously fed from continuous casting equipment, and 2 denotes a conveyor roller for the continuous cast piece 1. Reference numeral 3 denotes a gas cutting device, which is configured to be able to move forward and backward via a traveling axle 5 on rails 4 laid above both sides of the continuously cast slab 1 along the conveying direction thereof. Reference numeral 6 denotes a gas cutting torch (hereinafter referred to as the cutting torch) attached to the gas cutting device 3, and in this embodiment, it includes a holder 8 screwed onto the drive shaft 7 and a holding rod 9 hanging from the holder 8. It is attached so that it can be moved laterally through the Furthermore, in this embodiment, two cutting torches 6 are used.
are attached so that cutting can be started from both ends of the continuously cast piece 1. In order to gas-cut the continuous slab 1 with the gas cutting device 3, the gas cutting device 3, which is waiting at the cutting start position, is moved by, for example, a well-known clamping mechanism 1.
0 is activated and moves forward in synchronization with continuous slab 1 (arrow a
direction). Next, by rotating the drive shaft 7, the cutting torch 6 is moved laterally in the width direction of the continuous cast piece 1, and flame is injected from the cutting torch 6 to cut the continuous cast piece 1. In the present invention, the movement path of the cutting torch 6 refers to the path in which the cutting torch 6 moves laterally in the width direction of the continuous slab while jetting flame, as described above, and the gas cutting direction refers to the path in which the cutting torch 6 moves laterally in the width direction of the continuous slab while spraying flame. This refers to the direction in which is sprayed, that is, the thickness direction of the continuously cast piece 1 shown by the arrow y in FIG.
By the way, during the gas cutting, the temperature of the cutting section naturally becomes high. In particular, in recent years, various improvements have been made to maintain the temperature of the continuous cast strip 1 as high as possible by adopting so-called direct rolling, etc., in which the continuous cast strip 1 is directly fed to the rolling process without being cooled. ing. For example, as shown in FIGS. 1 and 2, measures have been actively taken to cover the continuously cast piece 1 with heat insulating covers 11 and 12 to prevent a drop in temperature during gas cutting and transport. Since the temperature of the continuously cast piece 1 is extremely high and the flame for gas cutting is injected, the atmosphere around the gas cutting part is heated, and as a result, a hot air flow is generated and the dust and cutting chips in the surrounding area are blown away. etc., and an updraft will be generated. Particularly in equipment covered with heat insulating covers 11 and 12 except for the portion where the cutting torch 6 moves as described above, the velocity of the upward flow is large and the temperature thereof is high. Problems such as damage to the 7 and the holding body 8, malfunction, etc. often occur, and repairs have to be carried out at short intervals.

The present invention was created to solve the above problems. The present invention will be described in detail below based on figures showing embodiments.

Now, as shown in FIGS. 1 and 2, the gas cutting device 3 of the present invention is equipped with a compressed gas injection nozzle (hereinafter referred to as an injection nozzle) 21. The injection nozzle 21 is provided with a blowhole 22, which will be described later, and is mounted above a moving path along which the cutting torch 6 moves laterally while ejecting flame. Fumarole 22
For example, along the moving path of the cutting torch 6, an arbitrary number of pores 22a are opened in the injection nozzle 21 at appropriate intervals as shown in FIG. 2, or discontinuously as shown in FIG. Continuous slit groove 22
It is constructed by opening b. Further, the blowhole 22 is configured to be substantially perpendicular to the gas cutting direction y of the cutting torch 6. When a compressed gas such as air or nitrogen gas is supplied to the injection nozzle 21, the compressed gas is ejected from the jet nozzle 22 and forms a barrier film by the ejected gas flow above the moving path of the cutting torch 6. That is, by forming the barrier film, the above-mentioned upward airflow caused by gas cutting is prevented, or even if an upward airflow occurs, it rises at a portion remote from the gas cutting device 3. Therefore, it is possible to prevent dust, cutting chips, frames, etc. contained in the upward airflow from adhering to the lateral movement mechanism such as the drive shaft 7 and the holder 8 and worsening the operation thereof, and also to prevent the lateral movement mechanism from adhering to the lateral movement mechanism such as the drive shaft 7 and the holder 8, and to prevent the hot air from adhering to the lateral movement mechanism. The pressure, flow velocity, flow rate, etc. of the compressed gas ejected from the blowhole 22 can protect the moving mechanism and the body of the gas cutting device 3, and can greatly extend the repair cycle of the gas cutting device 3. may be appropriately set according to the equipment conditions in the range in which the gas cutting device 3 moves back and forth (for example, the installation conditions of the heat insulating covers 11 and 12 or their structure, etc.), the size of the continuous slab 1, the gas cutting speed, etc. In the experience of the inventor, etc.
In the embodiment in which the injection nozzle 21 shown in the embodiment shown in FIG. 2 is installed in the gas cutting device 3 for cutting a continuous slab 1 having a thickness of 250 mm and a width of 1000 mm and air is used as the compressed gas, the pressure inside the injection nozzle 21 is 7Kg/ ^cm2
As described above, by setting the flow rate to 3,600 to 4,000 Nm ² /mm or more, an efficient barrier film that prevents the upward airflow can be formed, and as a result, there is no malfunction of the lateral movement mechanism.

Note that the installation position of the injection nozzle 21 is the cutting torch 6.
It is sufficient that the flame injected from the nozzle port 22 is located above the cutting torch movement path so that it is not affected by the ejected gas flow ejected from the nozzle port 22.
A heat insulating cover 11 fixed to the gas cutting device 3, or a suitable means such as a means for fixing a bracket 23 to the body 3a of the gas cutting device 3 and holding the injection nozzle 21 through the bracket 23, etc. It can be installed by

As described in detail above, although the present invention has a simple configuration, its practical effects are extremely large.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment based on the present invention. Figure 1 is a longitudinal cross-sectional view of the gas cutting device, Figure 2 is a cross-sectional view of the gas cutting device, and Figure 3 is a front view of the injection nozzle. It is a diagram. 1: Continuous slab, 2: Conveyance roller, 3: Gas cutting device, 4: Rail, 5: Running wheel, 6: Gas cutting torch, 7: Drive shaft, 8: Holding body, 9: Holding rod,
10: Clamp mechanism, 11, 12: Heat insulation cover,
21: injection nozzle, 22: blowhole, 23: bracket.

Claims (1)

[Scope of utility model registration request] A gas cutting device that moves a gas cutting torch in the width direction of the continuous cast piece to cut the continuous cast piece to a predetermined length, the gas cutting device including a gas cutting torch arranged above the moving path of the gas cutting torch and substantially orthogonal to the gas cutting direction. , and is equipped with a compressed gas injection nozzle equipped with continuous or discontinuous jet holes along the moving path, and is configured to form a jet flow blocking film above the moving path. Gas cutting equipment.