JPS6053271B2 - Thermal spray lance nozzle of flame gunning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermal spray lance nozzle for a flame gunning device.

Conventionally, when repairing refractory walls such as steelmaking furnaces and ladles, the first
A frame gunning device as shown in the figure has been proposed.

In this device, one end of a lance 2 is rotatably supported on a traveling truck 1, 3 is a pivot pin, 4 is a cylinder, and 5 is a heat shield plate. A nozzle 6 is fixed to the tip of the lance. For example, when repairing the side wall of the converter 7, the tip of the lance 2 is inserted into the furnace by moving the cart 1, and then the nozzle 6 is inserted. A combustion-supporting gas such as q is injected together with the spraying repair material (refractory material + fine powder of C), the refractory material is melted by combustion due to contact between the two, and this is sprayed to repair the furnace wall. I'm starting to do that. However, conventional nozzles are fixed to a lance and cannot be replaced.

Moreover, such conventional lance nozzles generally have a complicated structure, and in addition, because they are used under harsh conditions, they are subject to severe damage and require frequent replacement if the nozzle becomes clogged. .

However, since the conventional lance is fixed and cannot be replaced, it is necessary to replace the entire lance 2, which has the disadvantage of increasing costs. Particularly, among the nozzles, the inner nozzle pipe that flows the mixed spray repair material of refractory powder and C powder is subject to severe wear and tear, and the service life of this inner nozzle pipe is limited and the entire lance must be replaced. It was done. This invention is
It is constructed as a possible structure of the conventional lance nozzle as described above.

The details of the configuration will be explained below. The lance nozzle of the present invention has a lance of the same core multiple tubes consisting of a central flow path for spraying material flow and an annular flow path for combustion-supporting gas flow, with an inner nozzle pipe communicating with the center flow path, The lance is characterized in that the tip nozzle of the concentric double tube, in which the outer nozzle tube communicates with the annular flow path, is removably screwed onto a boss that fixes the inner nozzle tube to the lance inner tube. FIG. 2 is a drawing showing a preferred implementation/example thereof. The lance 2 is a concentric quadruple pipe, and a sprayed repair material consisting of a refractory powder such as MgO and powdered solid carbon (a preferred example is coke powder) is flowed into the center flow path 8. A combustion supporting gas such as oxygen or air is made to flow through the annular passage 9 formed between the tube 2a and the lance outer tube 2b.

Note that there is a water cooling jacket structure 2 on the outside of the lance outer tube 2b.
A heavy pipe is installed. The lance 2 has an inner nozzle pipe 6a in the center passage 8, and an outer nozzle pipe 6a in the annular passage 9.
b are attached so as to communicate with each other in the direction of the distal end of the lance 2.

In particular, the inner nozzle pipe 6a is removably attached by screwing the inner circumferential surface of the inner nozzle pipe 6a to the screwed boss 10 attached to the lance inner pipe 2a, so that it can be replaced in case of wear. Also,
A nozzle having such a structure can also be applied to a nozzle 6' provided in the radial direction of the lance other than the tip nozzle described above.

Further, as shown in FIG. 3, when the tip nozzle is not used, a blind plug 11 is screwed on and a refractory material 12 is applied. Note that the blind plug 11 may be provided with a seal packing 13 or a spacer. As explained above, according to the present invention, only the inner nozzle pipe, which wears quickly, is made removable, so the spraying accuracy is high and it is effective in reliably forming the desired repair wall. This has excellent practical effects, such as being able to provide an inexpensive lance nozzle with a long life.

[Brief explanation of the drawing]

The first figure in the drawings is an explanatory diagram of the frame gunning device, and the second figure is an explanatory diagram of the frame gunning device.
The figure is a cross-sectional view of the lance nozzle of the embodiment, and FIG. 3 is a drawing showing a state in which the tip nozzle is blinded. 1...Dolly, 2...Lance, 2a...
...Inner pipe of the lance, 2b...Outer pipe of the lance, 3...Zen, 4...Cylinder, 5...
・・Heat shield plate, 6,6″・・・Nozzle, 6a・・・
...Inner nozzle pipe, 6b...Outer nozzle pipe, 7.
... Converter, 8 ... Center passage of lance, 9
...Annular flow path of lance, 10 ... Boss, 11 ... Blind plug, 12 ... Refractory, 1
3... Seal packing, A... Combustion supporting gas, M... Repair material.

Claims (1)

[Claims] 1 For a lance of concentric multiple pipes consisting of a central flow path for spraying repair material flow and an annular flow path for combustion-supporting gas flow, an inner nozzle pipe communicates with the center flow path, and an outer nozzle pipe communicates with the annular flow path. 1. A thermal spray lance nozzle for a flame gunning device, characterized in that the inner nozzle pipe is removably screwed into a boss fixed to the lance inner pipe.