JPS5853986B2 - wet blast nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wet plasto nozzle used for descaling and surface grinding of hot rolled steel strips or other metal surfaces.

Wet-type plasto nozzles discharge abrasive slurry, which is a mixture of abrasives and liquids such as industrial water, and also spray high-pressure liquid at high speed to accelerate the abrasives at high speed. A jet of abrasive material is projected onto the surface of a processed material such as a hot-rolled steel strip, and the impact when the high-speed abrasive material collides with the surface of the processed material can descale the material surface, remove surface flaws, and perform other purposes. It performs surface treatment, and is used as a pollution-free, small-scale, energy-saving descaling method for grinding the surface of materials, etc., instead of pickling treatment, which requires large equipment and generates pollution.

As shown in Figs. 1 and 2, conventionally used wet-type plast nozzles have a plurality of high-pressure water jets around the tip side of a slurry discharge hole provided through the center of the nozzle body a. Small holes C were provided, and the high-speed jet water injected from these high-pressure water injection small holes C was focused on a focal point d to mix and accelerate the abrasive slurry discharged from the slurry discharge holes. .

For this reason, as shown in Fig. 3, the projection width e of the abrasive material accelerated by high-speed jet water is relatively narrow, and the blasting force f is excessively concentrated and large. When processing the surface of a wide material, processing unevenness occurs and a uniform surface treatment cannot be achieved.

The present invention makes it possible to uniformly spread the blasting force to prevent excessive concentration of the blasting force and to evenly treat a wide surface. A plurality of high-pressure liquid injection holes for jetting high-pressure liquid at high speed are provided around the high-pressure liquid injection hole, and the high-pressure liquid injection In a wet-type plastic nozzle in which a small hole has a required injection angle, a pressure gas introduction pipe is provided in the slurry discharge hole, and the high-speed jet is connected to a pressure gas supply device equipped with a pressure regulating valve. The gist of the present invention is a wet-type plast nozzle that is characterized by injecting gas at a required pressure toward a liquid convergence point.

Next, an embodiment of the present invention will be described with reference to FIGS. 4 to 6. A slurry discharge hole 2 is provided passing through the center of the nozzle body 1, and a plurality of slurry discharge holes 2 are provided around the tip of the slurry discharge hole 2. High-pressure liquid injection small holes 3 are arranged in a circular shape, and the direction thereof is an injection angle θ with respect to the center line of the slurry discharge hole 2.
The jetted liquid such as water is converged at a convergence point 4 on the center line of the slurry discharge hole 2.

A pressure gas introduction pipe 5 is disposed at the center of the slurry discharge hole 2, and its tip forms a nozzle 6, which protrudes from the nozzle body 1 toward the convergence point 4.

The nozzle main body 1 is housed in a nozzle holder 7 as shown in FIG. 6, and the high pressure liquid injection small hole 3 communicates with a high pressure liquid chamber 8 provided in the nozzle holder 7.

A high pressure liquid supply pipe 9 connected to the high pressure liquid chamber 8 and a slurry supply pipe 10 connected to the slurry discharge hole 2 are connected to the outside of the nozzle holder 7, and the pressure gas introduction pipe 5 is connected to an external pressure gas supply pipe 9. It is connected to the device 11.

A pressure gas source 12 and a pressure regulating valve 13 are provided within the pressure gas supply device 11 .

When high-pressure liquid such as high-pressure water is supplied from the high-pressure liquid supply pipe 9 in the above-described apparatus, high-pressure jet liquid 14 is ejected from the high-pressure liquid injection small hole 3 .

Next, when a slurry mixed with abrasive material and circulating water is supplied from the slurry supply pipe 10, this slurry is discharged from the slurry discharge hole 2, mixed with the high-pressure jet liquid 14, accelerated, and becomes a high-speed slurry mixing jet 15 that flows forward. is projected to.

Next, when pressure gas such as pressure air at a required pressure is supplied from the pressure gas supply device 11 to the pressure gas introduction pipe 5, the pressure gas is injected from the nozzle 6 and diffuses the high-speed slurry mixing jet 15.

The distribution of the blasting force f at this time is as shown in Fig. 7, where the central concentrated force is diffused and equalized within a certain range, and the projection state e of the high-speed slurry mixing jet 15 is also uniformly diffused, resulting in a uniform distribution of the wide surface. become suitable for processing.

It is also possible to construct a wide-width projection device by allowing a plurality of nozzle bodies 1 to be attached to the nozzle holder 7 in parallel.

In the present invention, high-pressure liquid is projected from a small high-pressure liquid injection hole to a focal point, and the blasting force of the abrasive mixed jet is strongly distributed at the projection center. Since the abrasive mixed jet is dispersed by spraying, the concentration of blasting force is averaged, and the diffusion width can also be widened, making it possible to uniformly treat a wide surface.

Furthermore, since the pressure of the pressurized gas can be adjusted in relation to the pressure of the high-pressure liquid, this method can also be used when controlling the pressure of the high-pressure liquid according to the processing line speed, such as when descaling hot-rolled steel sheets. By controlling the pressure of the pressurized gas in conjunction with the high-pressure liquid pressure to maintain an even distribution of blasting force, the hot-rolled steel strip can be uniformly descaled.

[Brief explanation of drawings]

Figure 1 is a vertical side view of a conventional wet-type plastic nozzle, Figure 2
The figures are a front view of Fig. 1, Fig. 3 is a graph showing the blasting force distribution and slurry projection state by a conventional wet blast nozzle, Fig. 4 is a vertical sectional view of the main part of an embodiment of the present invention, and Fig. 5
The figure is a front view of FIG. 4, FIG. 6 is a longitudinal sectional view showing the usage state of an embodiment of the present invention, and FIG. 7 is a graph showing the blast force distribution and slurry projection state by the wet blast nozzle according to the present invention. be. 1... Nozzle body, 2... Slurry discharge hole, 3... High pressure liquid injection small hole, 4...
・Focusing point, 5... Pressure gas introduction pipe, 6...
...Nozzle, θ...Injection angle.

Claims (1)

[Claims] 1 A plurality of high-pressure liquid injection holes for jetting high-pressure liquid at high speed are provided around a slurry discharge hole provided at the center of the nozzle body, and each high-speed jet liquid ejected from the high-pressure liquid injection small holes reaches the slurry discharge hole. a wet-type plast nozzle in which the high-pressure liquid injection small hole is set at a required injection angle so as to converge on the center line of the slurry, a pressurized gas supply device provided with a pressure gas introduction pipe in the slurry discharge hole and equipped with a pressure regulating valve; A wet-type plast nozzle 0 characterized in that it is connected to the pressurized gas introduction pipe and injects gas at a required pressure toward the convergence point of the high-speed jet liquid.