JPS6145493B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spraying machine for spraying highly viscous plastic refractories.

Conventional wet spraying machines that spray cement mixtures mixed with water can spray cement-based concrete and refractory castables continuously, but when spraying clay-based plastic refractories, viscous clay particles can be sprayed continuously. There was a problem in that the liquid adhered to the bent part of the discharge pipe coming out of the spray machine and blocked the discharge pipe. That is, FIG. 1 shows a conventional wet spraying machine, in which 1 is a hopper into which concrete 2 is charged, 3 is a stirring blade, 4 is a conduit that guides the concrete 2 downward, and a vibrator 5 is used. We are prepared. Reference numeral 6 denotes a rotating shaft that rotates the stirring blade 3 and a plurality of pockets 7 arranged around it. The pockets 7 sequentially come around to the lower part of the conduit 4 and are filled with concrete 2. Reference numeral 8 represents an air blowing pipe for blowing compressed air into the pocket, and reference numeral 9 represents a discharge pipe for blowing out the concrete in the pocket 7 with the compressed air blown from the air blowing pipe 8. A hose is connected to the discharge pipe 9, and a spray nozzle (not shown) attached to the tip of the hose performs spraying.

The discharge pipe 9 is usually provided with a bent part A called a gooseneck immediately after rising from the device, and in such a spraying machine, it is difficult to continuously spray cement-based concrete or refractory castable. However, if the plastic refractory has a high viscosity, the viscosity will adhere to the tube wall of this bent portion A, and the discharge tube 9 will eventually be blocked with the material. This is from pocket 7 to curved part A.
The distance to
This is because the material has a high viscosity and cannot smoothly pass through the bend A where the flow resistance is greatest.

In order to eliminate the above-mentioned drawbacks of the conventional example, the present invention provides a rising straight section of the discharge pipe with a length necessary for the plastic refractory to reach a speed with kinetic energy that overcomes the internal friction at the bent portion of the discharge pipe. The present invention provides a plastic refractory spraying machine that is installed in a plastic refractory and enables continuous spraying. Hereinafter, embodiments will be described in detail with reference to the drawings.

FIG. 2 shows an embodiment of the present invention.
11 is a hopper into which the plastic refractories 12 are introduced; 14 is a conduit for guiding the plastic refractories 12 downward; this conduit 1 is equipped with a vibrator 15 so that the highly viscous plastic refractories 12 can smoothly flow downwards. ing. Reference numeral 16 denotes a rotating shaft for rotating a circulating pocket group consisting of a plurality of pockets 17 arranged around the rotating shaft. 18 is an air blowing pipe for blowing compressed air into the pocket 17; 19 is a material discharge pipe; and 20 is a support fitting for supporting the discharge pipe 19. The discharge pipe 19 has a relatively long rising straight section B.
Continuing therefrom, there is a relatively gentle bend C, and a bendable hose is connected to the tip of this discharge pipe 19, and a spray nozzle is connected to the tip of the hose.

Next, the operation of this embodiment will be explained. First, the plastic refractory 12 put into the hopper 11
enters the conduit 14 and is guided downward by its own weight and vibrations transmitted to the conduit 14 by the vibrator 15. On the other hand, the circulation pocket group is rotated by the rotating shaft 16, and the pockets 17 are sequentially moved around the lower part of the conduit 14, so that the plastic refractory 12 in the conduit 14
falls into pocket 17, and this pocket 17
are sequentially moved to the discharge section.

In the discharge pipe, compressed air is blown into the pocket 17 through the air blowing pipe 18, and along with this air flow, the plastic refractories in the pocket 17 are blown out to the discharge pipe 19, and can be moved in any direction by a flexible hose. It is guided and sprayed from the spray nozzle onto the target. The above operations are performed continuously by rotating a series of circulating pocket groups.

In this embodiment configured as described above, the discharge pipe 19 is provided with a relatively long rising straight section B, which gives momentum to the material transfer and has a relatively large radius of curvature, that is, reduces internal friction in the pipe. curved part C
Combined with this, highly viscous plastic refractories can be transferred smoothly.

Note that the length of the rising straight portion B of the discharge pipe 19 depends on the air compression capacity, the radius of curvature of the bent portion, the pipe diameter,
It is determined by the viscosity of the material, etc., and in short,
The length may be sufficient as long as the momentum of the material flowing in the rising straight section, that is, the kinetic energy, overcomes the internal friction at the bent section. Since the material flows within the bendable hose with considerable force, there is no problem in transferring the material even if the hose is bent in any direction.

As explained above, according to the present invention, plastic refractories with high viscosity can be discharged smoothly and continuously, so there is an advantage that spraying can be carried out efficiently.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional wet spraying machine for spraying a cement mixture, FIG. 2A is a plan view of an embodiment of the present invention, and FIG. 2B is a sectional view of the same side. 11...Hopper, 12...Plastic refractory,
14... Conduit, 15... Vibrator, 16... Rotating shaft, 17
...pocket, 18...air blowing pipe, 19...discharge pipe,
B...Rising straight section, C...Curved section.

Claims (1)

[Claims] 1. A hopper into which plastic refractories are introduced, a conduit provided below the hopper to guide the plastic refractories, a vibrator placed near the entrance of the conduit to vibrate the conduit, and a vibrator that vibrates the conduit. a circulating pocket group having a shaft around which a plurality of pockets are arranged, the pockets sequentially going around to the lower part of the conduit; an air blowing pipe for blowing compressed air into the pocket, and a discharge pipe for blowing out the plastic refractories in the pocket with the compressed air blown from the air blowing pipe,
A plastic refractory spraying machine characterized in that the discharge pipe has a rising straight section having a length necessary for the plastic refractory to reach a speed at which it has kinetic energy that overcomes the internal friction of the bent portion of the discharge pipe. .