JPS62118000A - Dust removing device for spray material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a device for removing dust from sprayed materials.

<Conventional Equipment> For example, when concrete or the like is sprayed onto the wall of a tunnel, dust is generated.

Since the generated dust spreads and fills the tunnel, the working environment inside the tunnel becomes extremely poor.

Conventionally, the following devices exist as dust removal devices for sprayed materials, but each has its own problems.

Kui> There is a device that removes dust by installing a large blower for air supply and exhaust near the blowing nozzle, and using this large blower to forcefully create a large air flow inside the mine.

This device is time-consuming because it is necessary to move the large blower as the work progresses.

Exit> There is a device that removes dust by covering the sprayed area of the tunnel with an air curtain, sucking it in locally with a blower, and processing it with a dust collector.

This device is large-scale and therefore expensive.

Kuha> There is a device that installs a pipe and spray nozzle at the top of the tunnel, sprays mist from there, separates the spraying section from the general mine with a water curtain, and collects the abrasive particles in the spraying section.

This equipment is not only large-scale, but also requires special drainage treatment inside the mine.

Problems to be Solved by the Present Invention> As described above, the following problems exist in the conventional spray material dust removal apparatus.

〉Because it is a large-scale project, the cost will be high.

<mouth> It takes time and effort to move the necessary equipment as the work progresses.

<C> When spraying, other work cannot be done.

OBJECTIVES> An object of the present invention is to provide a new apparatus for removing dust from sprayed materials, which solves the above-mentioned problems.

<Example> Hereinafter, an example of the apparatus for removing dust from a sprayed material of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the apparatus for collecting and removing dust from sprayed materials according to the present invention includes a spray nozzle 1 connected to a spray machine via a supply hose 11, and a suction hose 21 connected to a suction machine that generates negative pressure.
The dust suction section 2 has a suction port 22 connected to the dust suction section 2 through a suction port 22.

In addition, in this figure, the spray machine and the inhaler are shown conceptually.

B> Spray nozzle The spray nozzle 1 is for spraying a spray material such as powder, and is connected to a spray machine via a supply hose 11 made of, for example, a flexible material. .

The spray material sprayed from this spray nozzle 1 is
The air is blown out to the front and sprayed onto the wall surface A.

Dust suction unit The dust suction unit 2 is for sucking generated dust from the suction port 22, and is connected to the suction machine via a suction hose 21 made of, for example, a flexible material. It is connected.

The suction machine generates negative pressure in the suction hose 21, so the dust suction unit 2 has a suction port 22 connected to the suction hose 21.
absorbs dust.

As shown in cross section in FIG. 2, the dust suction section 2 is an L-shaped double hood-like member, and the spray nozzle 1 is located inside.

This spray nozzle 1 is connected to a supply hose 11 and protrudes from a bent portion C of the dust suction portion 2.

At the front face F of the dust suction unit 2, an inlet 22 and an outlet 23 are located.

The spray nozzle 1 is located at a slightly recessed position in the center of the blow-off port 23, and the spray material sprayed from there is blown out in a funnel shape and is sprayed from the Suita mouth 23.

The suction port 22 is a part that generates negative pressure and sucks in dust, and is positioned so as not to obstruct the blowout of the spraying material sprayed around the blowout port 23 .

In order to increase the dust suction speed, as shown in FIG. 3, the cross-sectional area of the front surface F of the suction port 22 should be made as small as possible.

Furthermore, in order to inhale the dust before it spreads, the suction port 22 should be brought as close to the wall surface A as possible.

Operation of the present invention>1> Generation of dust The sprayed material such as concrete sprayed from the spray nozzle 1 onto the wall surface A bounces back onto the wall surface A and generates dust.

<2> Dust suction If the dust is normal, it will spread and fill the mine.

However, in the device of the present invention, the suction port 22 is located all around the blow-off port 23 of the spray nozzle 1.

The inside of the suction hose 21 connected to this suction port 22 is brought into a negative pressure state by an inhaler.

Therefore, dust is sucked into the dust suction section 2 having the suction port 22.

For this reason, the sprayed material is blown out only in front of the outlet 23, but the dust can be sucked out and removed before it spreads around it, so the tunnel pile is not filled with dust. .

<Other Embodiments> As shown in FIG. 4, it is also possible to collect dust by gathering one or more suction hoses 21 near the spray nozzle 1. In this case, the tip of the suction hose 21 This part becomes the suction port 22.

At this time, the distal end of the suction hose 21 is arranged in a funnel shape using, for example, a spacer 30 so as not to prevent the spraying material from being blown out to the front.

Note that, as shown in the figure, a pipe separated into two parts midway may also be employed as the suction pipe 21.

In this case, if the two separated pipes are arranged so that their positional relationship is vertical, the relatively heavy rebounding material will naturally move downwards due to gravity at the separation point P. Separate into

Further, although not shown, instead of using a plurality of suction pipes 22, it is also possible to use a pipe whose tip is divided into a plurality of pipes and which are assembled into one pipe in the middle.

EXPERIMENTAL EXAMPLE In order to confirm the dust removal ability when implementing the present invention, the following experiment was conducted.

Experimental conditions As shown in Figure 1, the experiment used a tunnel with a distance of about 10 m from wall A to tunnel entrance B, with tunnel entrance B covered by sheet 3.
to keep the inside of the mine as close to airtight as possible.

In order to compare the results with those obtained by implementing the present invention, two experiments were conducted: one in which only spraying was performed using the conventional method and no dust was removed, and the other in which the present invention was implemented.

In the case of the present invention, the measurement of dust was carried out at a position approximately 5 m away from wall surface A and at a height of 1 m, and when dust was not removed, it was measured at a position 3 m away from wall surface A and at a height of 1 m.

〉Experimental Method In both the case of spraying without removing dust and the case of implementing the present invention, spraying material was sprayed on wall surface A,
We investigated changes in the amount of dust inside the mine over time.

Kuha〉Experimental results Figure 5 shows the change in the amount of dust over time.

2> Discussion From FIG. 5, it was confirmed that when the present invention was implemented, the amount of dust filling the mine was very small, and the present invention was extremely effective as a means for removing dust.

Effects> Since the present invention is as described below, the following effects can be expected.

(a) Since dust is inhaled and removed before it spreads, no large-scale equipment is required and the cost is low.

Since the suction port is located near the spray nozzle, there is no need to specially move the device as the work progresses, so it does not take time and interfere with other work.

[Brief explanation of drawings]

Figure 1: Explanatory diagram of one embodiment of the present invention Explanatory diagram of the Dust Collection Department of the Daiichi Association Diagram of teeth: Explanatory diagram of other embodiments ㅅ Figure 4: Explanatory diagram of experimental results

Claims (1)

[Claims] Consisting of a spray nozzle that blows out powder, etc., and an inlet that generates negative pressure, which is placed around the spray nozzle at a position that does not impede the blowing of the sprayed material. A device for removing dust from sprayed materials, characterized by: