JPS6010783Y2 - gas cutting equipment - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a gas cutting device for cutting steel materials, particularly thick steel materials.

Conventionally, in gas cutting for cutting steel materials, especially thick steel materials, there is a gap (paris) that occurs during cutting at the lower end of the cut surface.
(also called slag) adheres to the cutting surface, and the faster the cutting speed, the more burrs will occur.

In the process of manufacturing steel products at a steelworks, if the particles are not removed and remain, the transport rollers will be damaged during the transport process of the cut steel products, and scratches will be formed on the steel products themselves.

Therefore, in the past, the above-mentioned particles were removed using a hand scarf blowpipe, or off-line by a method such as mechanical removal.

However, these conventional methods not only require a lot of man-hours but also have the disadvantage of being expensive.

This idea was made in view of the above circumstances, and its purpose was to create a gas cutting device that can remove debris stuck to steel materials in a short time and at low cost, without reducing the cutting speed of steel materials. The purpose of the present invention is to provide a deburring mechanism having a deburring nozzle located near the lower end of a cut surface of a steel material and spouting a deprivant removing fluid toward the lower end in the direction of movement, in close proximity to a cutting nozzle. By installing this, the pars produced by cutting the steel material are blown away with a pars removal fluid while they are still in a molten state.

This invention will be explained below with reference to the drawings.

Fig. 1 shows an embodiment of this invention, and the reference numeral 1 in the figure shows an embodiment of this invention.
is a cutting nozzle, and this cutting nozzle 1 is attached to the base 2.

This base 2 is fixed to a manifold 3 with bolts and nuts, and this manifold 3 is fixed to a support member 4.

Here, reference numeral 5 denotes a main body of the gas cutting device, which is composed of the base 2, the manifold 3, and the support 4.

Connected to the manifold 3 are a pipe 6a through which preheated fuel gas such as propane gas or acetylene gas flows, a pipe 6b through which preheating oxygen flows, and a pipe 7 through which cutting oxygen flows.

The preheating fuel gas flowing through the pipe 6a and the preheating oxygen flowing through the pipe 6b are separated from the cutting tip 1 or
It is made to merge in the manifold 3 and the base 2, and is ejected toward the steel material 8 through a hole (not shown) arranged around the central circulation hole in the cutting nozzle 1.

Further, the cutting oxygen flowing through the pipe 7 is transferred to the manifold 3. It passes through the base 2, passes through a central communication hole (not shown) in the cutting nozzle 1, and is ejected toward the steel material 8.

Reference numeral 9 in the figure indicates a combustion gas consisting of the preheating fuel gas, preheating oxygen, and cutting oxygen.

The combustion gas 9 ejected from the cutting nozzle 1 is ignited at the tip of the cutting nozzle 1, and cuts the steel material 8 as shown in the figure.

Here, the reference numeral 10 in the figure indicates a cut surface of the steel material 8, and the reference numeral 11 indicates a burr formed when the steel material 8 melted by the combustion gas 9 adheres to the lower end portion 12 of the cut surface 10.

20 is a burr removal nozzle, and this burr removal nozzle 20
As shown in FIG. 2, it is formed in the shape of a thick hollow cube, and is located below between the cut surfaces 10 and 10.

Two spout ports 21 are provided on both sides of the burr removing nozzle 20 facing the cutting surfaces io, io to eject burr removing fluid right sideways to the direction of cutting progress.

These spouts 21... are located slightly above the lower end 12 (bottom surface 5 of the steel material) of the cut surface 10, as shown in FIG. The ejection angle θ of the paris removal fluid with respect to the horizontal plane is 10° to 3
It is formed to be inclined within the burr removal nozzle 20 so as to have an angle of 0°.

This is because it has been experimentally confirmed that when the deburring fluid is sprayed onto the burr 11 at an angle of 10° to 30° with respect to the horizontal plane, the burr 11 is most efficiently blown away.

The paris removal nozzle 20 formed in this way has the first
As shown in the drawings and FIG. 2, it is connected and supported by a plate-shaped bracket 22 made of a material with high thermal conductivity.

This bracket 22 is fixed to the base 2 very close to the cutting tip 1 via a connecting member 23.

In other words, the bracket 22 is fixed to the base 2 as close as possible within a range where the bracket 22 and the deburr removal nozzle 20 are not directly exposed to the flame ejected from the cutting nozzle 1.

As a result, the burr removal nozzle 20, which moves simultaneously with the cutting nozzle 1, can reach between the burrs 11 on both sides produced by cutting while the burrs 11 are in a molten state.

Furthermore, a conduit 24 through which a deburring fluid flows is connected to the deburring nozzle 20 on the side opposite to the side facing the cutting nozzle 1, and this conduit 24 is connected to the base 2. It communicates with a flow hole (not shown) drilled therein through which a paris removal fluid flows.

A pipe 25 for distributing a par-removal fluid is connected to the base 2 near the pipe 7, and this pipe 25 communicates with the communication hole in the base 2.

Note that although oxygen is usually used as the above paris removing fluid, other fluids such as nitrogen, air, and water may also be used.

Reference numeral 26 is a thin tube for spouting cooling water (hereinafter abbreviated as thin tube)
This thin tube 26 is connected to the base 2 and opens toward the bracket 22.

Reference numeral 27 indicates a pipe through which cooling water flows, and the cooling water passes through this pipe 27, is supplied to the thin tube 26 via the manifold 3 and the base 2, and is injected onto the bracket 22.

In addition, the reference numeral 28 in the figure indicates a burr removal mechanism comprising the burr removal nozzle, the bracket 22, the connecting member 23, the conduit 24, and the thin tube 26.

Next, the operation of the gas cutting device according to this invention will be explained.

First, the cutting tip 1 cuts the steel material 8 as shown in FIG.

As the steel material 8 is cut, a burr 1 is attached to the lower end 12 of the cut surface 10.

This burr 11 remains in a molten state for a while after being attached, and when a burr removing fluid is ejected from the burr removing nozzle 20 located at a close distance behind the cutting nozzle 1, this burr removing fluid is It is sprayed onto the burr 11 at an optimal spray angle to blow away the burr 11.

Moreover, since the deburr removal fluid is injected right sideways, the distance from the deburr removal nozzle 20 to the burr is shortened.

Therefore, the fluid can blow against the inner burr 1 whose jetting force is not attenuated, and the burr can be blown away with force and reliably.

Here, the deburr removing nozzle 20 tends to become overheated due to the cutting nozzle 1 and the burr 11, but since the cooling water is injected from the thin tube 26 toward the bracket 22, the nozzle 20 does not become overheated.

Moreover, since the paris removal nozzle 20 is formed thick, it can function normally without being subjected to thermal deterioration due to the effect of the cooling water.

In this way, the gas cutting device of this invention is a device that simultaneously cuts the steel material 8 and blows off the spark 11 generated by cutting the steel material 8 while the gas cutting device 11 is in a molten state. Paris can be easily removed without slowing down.

In the above embodiment, four spout ports 21 are provided on both sides of the pari removal nozzle 20, but the number is not limited to four, and one jet port is provided on each side surface.
It may be provided in one, two or more, or in the form of a slit.

As explained above, the gas cutting device according to this invention is
The deburr removal mechanism is located near the lower end of the cut surface of the steel material, and has a deburr removal nozzle that spouts deburr removal fluid toward the lower end.The deburr removal mechanism is installed near the cutting nozzle. It is possible to blow away the pars produced by cutting while the pars are in a molten state, and it is possible to remove the pars that adhere to the steel material in a short time and at low cost without reducing the cutting speed of the steel material. .

[Brief explanation of drawings]

Figure 1A shows an embodiment of this invention; Figure 1A shows a front view of the gas cutting device according to the invention;
FIG. 2 is a perspective view of the deburr removal mechanism of the gas cutting device according to this invention, and FIG.
0 and its vicinity; FIG. 1... Cutting crater, 5... Gas cutting device main body, 8... Steel material, 9... Combustion gas,
20... Paris removal nozzle, 22...
bracket.

Claims (1)

[Scope of utility model registration request] A cutting nozzle for cutting steel materials, especially thick steel materials, is attached to the main body of the gas cutting device, and a bracket is suspended from the gas cutting device main body very close to the rear of the cutting nozzle in the direction of movement, and the tip of this bracket is used to remove pars from the side. A gas cutting device that is equipped with a thick deburring nozzle that ejects cleaning fluid straight to the side.