JPS6133629B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is applicable to linings of various furnaces, other buildings,
This invention relates to a spray gun that can also be used for lining work in civil engineering work, etc.

For example, when lining kilns, etc., conventional dry spraying methods generally use long spray nozzles (e.g. 1000 mm or more) and short spray nozzles (approximately 300 to 500 mm).
mm) is used. In the case of a long spray nozzle, the distance from the time the water is injected into the spray nozzle to the time it is sprayed is long, so the powder and liquid are mixed well, there is little dust generation, and the adhesion is good, but a short spray nozzle is used. In this case, a lot of dust was generated (which inevitably worsened the working environment), and the adhesion of the refractory to the wall surface was extremely poor. Therefore, at present, an appropriate amount (for example, 1 to 6%) of liquid is mixed and moistened with a mixer or the like in advance to improve dustproofing and adhesion. However, it is necessary to separately provide kneading equipment, it is necessary to secure personnel, and the work is also very complicated.

The present invention was created in consideration of the current situation, and its purpose is to save labor by minimizing the kneading equipment and personnel, and to significantly improve the adhesion rate of sprayed refractories. The aim is to provide a spray gun that can.

The spray gun according to the present invention is provided with a fluid injection part in the middle of a powder transfer path that transfers powder from a powder storage tank to a spray nozzle, and has a vibrating member in the injection part and a gap for a gas flow path on its outer periphery. It is characterized by having an outer cylindrical body attached thereto.

Hereinafter, the spray gun according to the present invention will be explained in Figs. 1 to 7.
This will be specifically explained using the embodiment shown in the drawings.

FIG. 1 shows the overall structure of the spray gun according to the first embodiment. In the figure, 1 is a powder storage tank for storing powder, and 2 is a tank for spraying refractories onto the wall surface A to be constructed. A spray nozzle 3 is a powder transfer pipe that communicates the powder storage tank 1 with the spray nozzle 2 to transfer powder;
4 is a water injection part provided in the middle of the powder transfer pipe 3, and 5 is a secondary water injection part that performs secondary water injection into the spray nozzle 2.

2 to 4 show the detailed structure of the water injection section 4, and 10 is a cylindrical water injection section main pipe with openings at both ends, and the water injection section main pipe is essentially a two-part pipe 1.
0a and 10b are flange-coupled, one end of the one-side split pipe 10a is connected to the upstream powder transfer pipe 3a by a coupling 11, and the other end of the other-side split pipe 10b has a tapered shape. One end is connected to the downstream powder transfer pipe 3b by a coupling ring 12. Reference numerals 13 and 14 denote a liquid inflow pipe and a spray nozzle used to spray and mix a liquid (usually water) into the powder passing through the water injection part 4. It consists of the formed annular water inflow space 14a and an annular jet water channel 14b formed on the outer circumferential surface of the distal end of the divided tube and opening into the other side divided tube 10b. Inside the main pipe 10 of the water injection section, a vibrating body 15 for preventing adhesion of powder and granules, which is a hollow cylinder shaped like a truncated cone, is arranged concentrically and spaced apart. An annular space 16 is formed therebetween. The base end of the vibrating body 15 is integrally fixed to a flange connecting portion 17 that connects the split tubes 10a and 10b.

In this embodiment, the gap holding means used to hold the annular space 16 is the downstream split pipe 10.
An annular compressed air inflow space 18 is formed on the outer peripheral surface of the base of b, and compressed air is brought into the annular air gap 16 from the inflow space through the through hole 19, and further from the annular air gap 16 through the blowout opening 16a. The water is configured to be ejected into the main pipe 10 of the water injection section.

In the above configuration, the material of the vibrating body 19 for preventing adhesion of powder particles may be rubber having wear resistance, or a thin steel plate or piece of steel. Its shape does not necessarily have to be the above-mentioned truncated conical shape, but may be a simple cylinder, plate, strip, flare, chain, string, bead shape, or the like. It is also conceivable to provide a protrusion on the outer peripheral surface of the vibrating body 15. That is, as long as the vibrating body 15 is held apart from the inner wall of the water injection section main pipe 10 by the inflowing compressed air, the vibrating body 15 can take a desired shape. The structure of the coupling rings 11 and 12 may take various forms, but in this embodiment, a toggle clamp 20 is used to allow the water injection part 4 to be detachably attached to the middle of the powder transfer pipe 3. Also, the liquid inflow pipe 13
is used exclusively to add water to the powder to be transported, but it can also be used to introduce binders and suspensions, and for cleaning (spraying residual water in the pipe into the water injection part) or It may also be used to inflow compressed air for imparting auxiliary conveying energy, and the liquid inflow pipe 1 after ejection may also be used.
A drain may be installed to remove water remaining in the container 3, and a vacuum suction pump may be connected. The length of the powder transfer pipe 3b from the water injection part 4 to the spray nozzle 2 is preferably 1 m or more. Further, the water injection part 4 can be directly connected to the spray nozzle 2, and similarly can be directly connected to the powder storage tank 1.

Next, the operation of the spray gun according to the present invention will be described.

First, powder is force-transferred from the powder storage tank 1 into the powder transfer pipe 3a on the upstream side using compressed air or the like. When the powder is introduced into the water injection section main pipe 10, a desired amount (for example, 2%) of water (liquid) is mixed in through the liquid inlet pipe 13 and the spray nozzle 14. Moreover, the vibrating body 15 generates vibrations due to the transport energy of the powder to be transported and the water injection energy. On the other hand, compressed air is ejected into the water injection section main pipe 10 through the air inflow space 18 and the annular space 16, and the vibrating body 15 is constantly maintained at a distance from the inner wall surface of the water injection section main pipe 10 due to the inflow and ejection. On the other hand, the compressed air also promotes the vibration of the vibrating body 15. Due to this operation of the water injection section 4, the mixture of powder and water does not adhere to the inner wall of the water injection section 4 surrounding the vibrating body 15, not to mention the vibrating body 15, and is transferred to the powder on the downstream side. The water is brought to the transfer pipe 3b, and then secondary water injection is performed at the spray nozzle 2, and then sprayed from the same nozzle onto the desired wall surface to be constructed.

5 and 6 show a second embodiment of the water injection part structure according to the present invention, and as shown in the figures, this embodiment substantially connects the liquid inflow pipe 21 to the water injection part main pipe 1.
0 axis, and then bent in the same direction as the outflow direction of the refractory, and a jet nozzle 22 is installed at the tip.
It is characterized by the fact that it is equipped with. Note that the other components have the same structure and function as the water injection part in one embodiment, and are respectively "-
1”.

FIG. 7 shows a third embodiment of the water injection part structure according to the present invention, and as shown in the figure, this embodiment uses an air rammer 23 and a shock absorber in addition to the compressed air inflow structure of the first embodiment as a distance maintaining means. The Zobar 24 is attached to the water injection section main pipe 10-2 to further enhance the spacing maintaining function and the adhesion prevention function due to vibration. Note that the other components have the same structure and function as the water injection part structure of the first embodiment, and are indicated by "-2", respectively.

As described above, the spray gun according to the present invention has the following effects.

(1) A water injection part is installed in the middle of the powder transfer pipe, and the desired amount of water is mixed from the same part, which eliminates the need for kneading equipment and the personnel required for the equipment, and improves work efficiency. can be improved.

(2) The water injection part has a vibrating body inside, and the vibrating body vibrates by itself due to powder energy and jet water energy, and the vibrating body is constantly separated from the inner wall of the water injection part. The adhesion and deposition of slurry can be effectively prevented. Furthermore, the compressed air inlet mechanism forming the spacing mechanism can also promote the vibration effect.

The water injection part structure according to the present invention can be applied not only to a spray gun having the above-mentioned spray nozzle at the tip, but also to a method of pouring into molds, containers, etc., which has only a simple discharge port. . In this case, the pouring conditions are preferably a pouring pressure of 3 kg/cm ² or less, preferably 2 kg/cm ² .

[Brief explanation of the drawing]

FIG. 1 is an overall explanatory diagram of a spray gun according to the present invention;
Fig. 2 is a longitudinal cross-sectional view showing the first embodiment of the water injection part, Fig. 3 is a cross-sectional view taken along the line in Fig. 2, Fig. 4 is a cross-sectional view taken along the line in Fig. 2, and Fig. 5 is a cross-sectional view taken along the line in Fig. 2. FIG. 6 is a cross-sectional view taken along the line of FIG. 5, and FIG. 7 is a vertical cross-sectional view showing the third embodiment.

Claims (1)

[Claims] 1. A fluid injection part is provided in the middle of the powder transfer path that transfers the powder from the powder storage tank to the spray nozzle, and inside the injection part there is a vibrating member and an outer cylindrical body with a gap for a gas flow path on its outer periphery. A spray gun characterized by having a.