JPH025892Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a spray nozzle, and in particular, it prevents spray material from adhering to and accumulating on the inner peripheral surface of the tip of the nozzle, and This invention relates to a spray nozzle that has been improved to eliminate the so-called drooping phenomenon.

[Prior art] As a method of spraying monolithic refractories or cement, monolithic refractories or a mixture of cement and sand are supplied into a nozzle, and water is added to this at the tip of the nozzle to form a slurry. As a method, there is a method of ejecting it from the tip of a nozzle. (Hereinafter, the monolithic refractories before adding water or the mixture of cement and sand, etc., will be referred to as "raw materials," and the raw materials to which water has been added may be referred to as "materials.") Figure 2 shows the following: Used in such spraying processes,
FIG. 2 is an axial cross-sectional view of a conventional spray nozzle.
As shown in the figure, a water addition section 12 for injecting water into the nozzle 10 is provided at a position a required distance backward from the tip opening of the nozzle 10. This water addition section 12 includes a large number of water addition holes 14 penetrating the nozzle pipe wall surface, a ring-shaped water distribution member 16 that covers the outer periphery of the portion where the water addition holes 14 are drilled, and this water distribution member 16. It consists of a water inlet pipe 18 connected to.

In Fig. 2, water is added to the raw materials such as monolithic refractories and mixtures of cement and sand fed from the left side of the figure in the water addition section 12, and then to the part a on the tip side. The mixture is kneaded into a slurry, which is ejected from the tip opening 20.

In such a spray nozzle, the slurry produced by kneading at the tip a has adhesiveness and tends to adhere to and accumulate on the inner circumferential surface of the tip a. When adhesion and deposition occur, a so-called breathing phenomenon occurs in which the slurry ejection speed pulsates, or a so-called dripping phenomenon occurs in which the slurry partially stalls and drips from the nozzle tip. In Figure 2, A indicates adhesion;
B shows sag.

In general, in a spray nozzle, the shorter the distance from the water addition part to the tip opening, the less the material and water will mix together, and even if they are mixed, the water and material will separate again and cause a dripping phenomenon. This tends to lead to a decrease in the adhesion rate to the sprayed surface. In addition, although the nozzle drips down, it generally contains a large amount of components such as fine powder and binder, and the amount of matrix of material adhered to the wall, ceiling, etc. may be insufficient, resulting in a decrease in quality. In addition, if the mixing condition is poor, more dust will be generated and the working environment will deteriorate.

In order to solve these problems, the tip of the nozzle is made of a material such as rubber so that it can vibrate, or a slit is cut from the tip of the nozzle in a direction parallel to the axis to make the tip flexible. , a method has been proposed in which the tip part is vibrated using compressed air or the like to scatter the adhering material (for example,
11621, Japanese Unexamined Patent Publication No. 102959/1983).

[Problems that the invention attempts to solve] The above-mentioned Japanese Patent Publication No. 11621/1983 and Japanese Patent Application Laid-open No. 1983-
According to the measures disclosed in Publication No. 102959 and the like, adhesion of material to the inner surface of the nozzle tip can be prevented to some extent. However, the velocity of the material along the inner surface of the tip is low, so it is not possible to prevent the phenomenon of drooping from the tip opening. Further, a rotating nozzle has already been proposed in Japanese Patent Application Laid-Open No. 114758/1983.

However, with this proposal, although we can expect a mixture,
Adhesion prevention and drip prevention effects cannot be expected on the tip side of the rotating part.

Furthermore, if the nozzle tip is forced to vibrate, a large external force will be applied to the nozzle tip, which will shorten the life of the nozzle tip, and in extreme cases, it will be necessary to perform spraying operations. Occasionally, breakdowns occur and it is necessary to interrupt work and replace the nozzle tip member, causing other problems.

[Means for solving the problem] The present invention rotates the tip of the spray nozzle in order to prevent material from adhering to the tip side of the water addition part and to prevent material from dripping. It is configured so that it can be obtained.

That is, the present invention has a water addition section 12 as shown in the drawings.
This is characterized in that tip nozzles 24, 48, 50, and 52 are rotatably arranged around their axes on the tip side of a nozzle body 22 having a main body 22.

[Operation] Since the tip nozzles 24, 48, 50, and 52 rotate, material is prevented from adhering to their inner peripheral surfaces.
The centrifugal force of this rotation also blows the material away from the nozzle tip, eliminating the dripping phenomenon.

[Example] Examples will be described below.

FIG. 1 is an axial cross-sectional view of a spray nozzle according to an embodiment of the present invention. 22 is a nozzle body, and a tip nozzle 24 is rotatably connected to the tip side of the nozzle body. That is, the base end side of the tip nozzle 24 is a large diameter portion 24a;
A rotary bearing 26 is installed between the nozzle a and the outer circumferential surface of the tip of the nozzle body 22, thereby allowing the tip nozzle 24 to rotate around its axis.

In addition, a ring-shaped nozzle cover 28 with an L-shaped cross section
supports the tip nozzle 24 in the thrust direction. That is, the nozzle cover 28 consists of a washer-like disk part 28a and a short cylindrical part 28b. Plate part 28
A is provided. A bearing 30 such as a bearing is provided between the inner circumferential edge of the disc portion 28a and the large diameter portion 24a.

Note that the tip surface of the nozzle body 22 and the tip nozzle 24
A seal 32 is provided between the rear end surfaces.

12 in the figure is a water addition section similar to that in FIG.
It consists of a water distribution member 16 to which a water introduction pipe 18 is connected, and a water addition hole 14 that communicates the inside of the water distribution member 16 with the inside of the nozzle body 22.

In the embodiment shown in FIG. 1, the tip nozzle 2
4 is rotated by the resistance of the slurry flowing inside it.

FIG. 3 is an axial cross-sectional view of a spray nozzle according to a different embodiment of the present invention, and FIG.
It is a sectional view along a line.

In the embodiment shown in FIGS. 3 and 4, blades 34 are provided upright on the outer peripheral surface of the large diameter portion 24a of the tip nozzle 24, and the nozzle cover 28 has compressed air almost tangentially inside. A compressed air introduction pipe 36 and a compressed air discharge pipe 38 for introducing air are connected. By introducing compressed air from the introduction pipe 36, the tip nozzle 24 is forcibly rotated. This more reliably prevents material from adhering to the inner circumferential surface of the tip nozzle 24, and also increases the centrifugal force by increasing the number of revolutions, further ensuring that dripping from the tip opening of the tip nozzle 24 is prevented. It can be prevented.

FIG. 5 is an axial cross-sectional view of a spray nozzle according to yet another embodiment of the present invention. This fifth
In the illustrated embodiment, the tip nozzle 24 is rotationally driven by an electric motor 40 . That is, the electric motor 4 is mounted on a fixed frame 42 attached to the nozzle body 22.
0 is installed, and a gear 44 is fixed to the rotating shaft of the electric motor 40. On the other hand, a gear 46 that meshes with the gear 44 is fixed to the outer peripheral surface of the large diameter portion 24a of the tip nozzle 24. Therefore, by driving the electric motor 40, the tip nozzle 24 is forcibly rotated.

In the embodiment shown in FIG. 5 as well, the tip nozzle 2
4 can be increased, similar to the embodiments shown in FIGS. 3 and 4, an excellent effect of preventing material from adhering to the inner peripheral surface of the tip nozzle and preventing material from dripping can be achieved.

In each of the above embodiments, the tip nozzle 24 is a cylindrical body having the same diameter, but the present invention is not limited to this. That is, as shown in FIG. 6, the tip nozzle may have a shape 48 whose diameter gradually increases toward the tip. If the nozzle 48 is shaped like a truncated cone in this manner, centrifugal force will also act on the material trying to adhere to the inner circumferential surface of the nozzle 48, and the material will be smoothly moved toward the tip of the nozzle. Also, since the diameter is large,
Even if the number of rotations is the same, the centrifugal force at the edge of the opening of the tip end nozzle 48 increases, and the effect of preventing drooping becomes even more reliable.

In the embodiment shown in FIG. 6, the tip nozzle 4
Although the wall thickness of the nozzle 8 is constant, it may be made to gradually become thinner toward the nozzle tip side, as in the tip nozzle 50 shown in FIG.

FIG. 8 is an axial cross-sectional view of a spray nozzle according to still another embodiment of the present invention.

In the embodiment shown in FIG. 8, the tip nozzle 52 is formed with a plurality of slits 54 cut from its tip edge in a direction parallel to the axis. It is configured to have a plurality of tongue-like pieces 56 extending laterally. The tongue-shaped piece 56 is flexible and maintains a posture curved in the axial direction or slightly toward the center when at rest.

In FIG. 8, on the outside of the tip nozzle 52,
A nozzle cover 58 is provided coaxially with this. This nozzle cover 58 has a large diameter portion 58a at its base end, and a compressed air introduction pipe 36 and a compressed air discharge pipe 38 (not shown) are connected to this large diameter portion 58a as in FIG. It is connected. On the outer circumferential surface of the proximal end enlarged diameter portion 52a of the tip nozzle 52,
A large number of wings 34 are erected. The tip nozzle 52 is forcibly rotated by the compressed air introduced from the compressed air introduction pipe 36.

In this embodiment shown in FIG. 8, the raw material supplied into the nozzle body 22 and the water added from the water addition hole 14 are transferred to the tip nozzle 52 as in each of the embodiments described above.
The tongue-like piece 56 is kneaded into a slurry inside and is ejected from the tip opening, but as the tip nozzle 52 rotates, the tongue-like piece 56 bends in the direction in which its tip side expands in diameter, and the tongue-like piece 56 is flexed in the direction in which the tip side expands in diameter. slide. As a result, the material that tried to adhere to the inner circumferential surface of the nozzle cover 58 is rubbed and scraped off, and the tip nozzle 5
It is ejected from the tip opening of 2. Therefore, in this embodiment as well, as in the previous embodiments, adhesion of material to the inner circumferential surface of the tip nozzle is prevented, and the sagging phenomenon is also eliminated.

In the embodiment shown in FIG. 8, the tip nozzle 5
2, instead of the tongue-like piece, a large number of needle-like thin rods may be arranged so as to extend in a direction parallel to the axis from the base end of the rotating nozzle toward the tip. Even when a needle-like thin rod is provided in this way, as the tip nozzle rotates, this thin rod member moves toward the nozzle cover 58.
It slides on the inner circumferential surface of , and the same effect as the embodiment shown in FIG. 8 is achieved.

It is clear that in the embodiment shown in FIG. 8 as well, in addition to the air turbine rotary drive device, a drive method using an electric motor as shown in FIG. 5 may be adopted.

[Effects] As detailed above, the spray nozzle of the present invention has the following effects:
A tip nozzle is rotatably provided at the tip, and the rotation prevents material from adhering to the inner peripheral surface of the tip nozzle, and the material is blown away from the tip opening by centrifugal force.

Therefore, according to the present invention, material does not adhere or accumulate on the inner circumferential surface of the nozzle tip, and dripping of material from the nozzle tip is reliably prevented.

In addition, it does not use a vibrating member like the conventional example,
The tip nozzle is highly durable.

[Brief explanation of drawings]

1, 3, 5, and 8 are sectional views in the nozzle axis direction of the spray nozzle according to the embodiment, FIG. 2 is a sectional view in the nozzle axis direction of a conventional spray nozzle, and FIG. 4 is a sectional view taken along the line in FIG. 3, and FIGS. 6 and 7 are respectively the tip nozzle 48,
50 is a sectional view in the axial direction of the nozzle. 12...Water addition part, 14...Water addition hole, 16...
... Water distribution member, 18 ... Water introduction pipe, 20 ... Tip opening, 22 ... Nozzle body, 24, 48, 50,
52... Tip nozzle, 28, 58... Nozzle cover, 34... Wing, 36... Compressed air introduction pipe, 38
...Compressed air discharge pipe, 40...Electric motor, 42...
Fixed frame, 44, 46...gear, 54...slit, 56...tongue.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a spray nozzle having a water addition part a predetermined distance behind the tip opening, a nozzle body having the water addition part, and a part on the tip side of the nozzle body around its axis. A rotatably connected tip nozzle,
A spray nozzle comprising: (2) The spray nozzle according to claim 1, which is characterized by being provided with a drive device for rotating the tip nozzle. (3) The spray nozzle according to claim 1 or 2, wherein the tip nozzle has a shape whose diameter gradually increases toward the tip. (4) The tip nozzle has a plurality of tongue-shaped pieces extending from the base end toward the tip side, and a nozzle cover that surrounds the outer periphery of the tip nozzle is fixedly installed on the nozzle body. A spray nozzle according to any one of claims 1 to 3 of the utility model registration claims. (5) The tip nozzle consists of a number of thin rods extending from the base end to the tip side, and a nozzle cover that surrounds the outer periphery of the tip nozzle is fixedly installed on the nozzle body. A spray nozzle according to any one of claims 1 to 3 of the utility model registration claims, characterized in that: