CN102296955A - Dedusting method with closed excavating working face and system thereof - Google Patents

Abstract

The invention discloses a closed dust removal method and system for a tunneling working face, which comprises a press-in fan, a press-in air cylinder, a metal frame gauze, an atomizing nozzle, a dust removal fan and a draw-out air cylinder; the press-in fan forms The air flow is blown out through the press-in type blower to form an air curtain that can close the entire working section of the roadway, and at the same time blow the dust to the other side of the roadway; the atomizing nozzle and gauze mesh cooperate to form a dust control water curtain on the other side of the roadway The gauze and the extractor fan are connected to the dust removal fan. Under the action of the dust removal fan, the dust in the dust accumulation area is sucked into the extractor fan from the dust collection hood, and then enters the dust removal fan for purification. The design method of the present invention is simple and practical, easy to operate, less maintenance workload, does not hinder the normal operation of on-site personnel, the dust removal efficiency exceeds 96%, and the dust removal effect is good.

Description

A closed dust removal method and system for a tunneling face

technical field

The invention relates to the technical field of dust removal technology for roadheaders in coal mine excavation working faces, and in particular to a closed dust removal method for the excavation work face and a closed dust removal system for the excavation work face.

Background technique

With the continuous improvement of the degree of mechanization of tunneling, the tunneling methods and techniques of mine roadways are developing towards high-yield and intensive production. It has the advantages of high output and fast footage, but at the same time, this technology is also likely to lead to a high amount of dust in the tunneling roadway, which directly brings great difficulties to the dust prevention and control work in the mine. According to the actual measurement, without any dust prevention measures, the dust concentration at the face of the machine excavation is 1200-1500mg/m ³ , and some of them are as high as 3000mg/m ³ . The existence of a large amount of dust poses a great threat to the physical and mental health of the workers on the working face and the safe and efficient production of the mine.

At present, various dust removal technologies such as spraying inside and outside the roadheader, dust extraction and purification have been formed in the aspect of flour dust prevention and control of machine excavation. The defect that hinders the work of the on-site staff, and, due to the particularity of the excavation work face, the existing dust removal measures are far from being able to reduce the dust concentration of the work face to a safe range. Therefore, it is urgent to design a dust removal method and system for machine excavation face with good dust removal effect and simple structure. the

Contents of the invention

The task of the present invention is to provide a closed dust removal method for a tunneling face and a closed dust removal system for a tunneling face; dust removal effect.

Its technical solutions are:

A closed dust removal method for an excavation face, comprising the following steps:

① Above the side of the roadway where the driver's station of the roadheader is located, the dust removal airflow is sent to the working section through the press-in type air duct, and an air curtain covering the entire section is formed at the working section to prevent dust from flowing to the back of the tunneling head Spread the manned operation area, and at the same time, blow the dust generated by the tunneling head to the other side of the roadway;

②Arrange gauze on the other side of the above-mentioned roadway, and adopt the method of spraying water curtain to cooperate with the gauze to form a dust-control water curtain gauze, which is used to capture the dust blown to the same side of the roadway in the above step ①;

③Above the other side of the above-mentioned roadway, the dust collected in step ② is concentrated and extracted through the extraction type air duct, and then enters the purification treatment step.

A closed dust removal system for an excavation face, comprising:

A push-in fan;

A press-in type air duct, the press-in type air duct is suspended on the top plate above the side of the roadway where the driver's station of the roadheader is located, the press-in type air duct is connected with the above-mentioned press-in type fan, and the airflow formed by the press-in type fan passes through The press-in type blower blows out to form an air curtain that can close the entire working section of the roadway, and at the same time blow the dust to the other side of the roadway;

A metal frame gauze, including mesh cloth and a metal frame supporting the mesh cloth, an atomizing nozzle is arranged on the top of the metal frame gauze. One side, located between the roadheader and the side wall of the roadway, is used to capture the dust blown to the same side of the roadway;

a dust removal fan;

A draw-out air duct, the draw-out air duct is suspended on the top plate above the other side of the above-mentioned roadway, the draw-out air duct passes through the top of the metal frame gauze, and the exhaust port of the draw-out air duct is located between the metal frame gauze and the excavation surface In the dust accumulation area between the tunneling heads, a trumpet-shaped dust collection hood is installed at the air outlet, and the draw-out air duct is connected to the dust removal fan. Under the action of the dust removal fan, the dust in the dust accumulation area is removed from the dust collection Inhale and extract the air duct, and then enter the dust removal fan for purification.

The above-mentioned metal frame gauze is installed on one side of the body of the roadheader, controlled by movable bolts, and can be folded onto the body of the roadheader.

The present invention has the following beneficial technical effects:

The present invention adopts the technical method of combining the self-constructed air curtain and water curtain gauze of the press-in air duct, which can effectively isolate the dust produced by the excavation head on the excavation surface from the field operators. Simple and practical, easy to operate, less maintenance workload, does not hinder the normal operation of on-site personnel, the dust removal efficiency exceeds 96%, and the dust removal effect is good. In addition, the trumpet-shaped dust collection hood is installed in the area where the dust concentration is the most concentrated, and the dust extraction effect is good. Since both the draw-out air duct and the dust removal fan are hung on the roof of the roadway, the draw-out air duct has no folding section, and there will be no suction. The danger of the flat air tube effectively guarantees the air suction volume.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the present invention will be further described:

Fig. 1 is a schematic diagram of the structural principle of an embodiment of the closed dust removal system of the driving face in the present invention, which is a schematic diagram of the structure in side view.

FIG. 2 shows a top view structure of the manner in FIG. 1 .

Fig. 3 shows the front view structure of the mode in Fig. 1 .

Figure 1. Tunneling machine, 2. Vacuum cover, 3. Metal frame gauze, 4. Atomizing nozzle, 5. Nozzle support tube, 6. Withdrawable air duct, 7. Press-in air duct, 8. Dust removal fan.

Detailed ways

With reference to Fig. 1, Fig. 2 and Fig. 3, the closed dust removal method of the excavation face will be described below in combination with the closed dust removal system of the excavation face in the present invention.

A closed dust removal system for a tunneling face, comprising a press-in fan, a press-in air cylinder 7, a metal frame gauze 3, an atomizing nozzle 4, a dust removal fan 8 and a draw-out air cylinder 6.

The above-mentioned press-in air cylinder 7 is suspended on the top plate above the side of the roadway where the driver's station of the roadheader is located. Blow out to form an air curtain that can close the entire working section of the roadway, and at the same time blow the dust to the other side of the roadway. This method can form an air curtain covering the entire section to prevent high-concentration dust from spreading to the manned operation area behind the heading head, and at the same time, blow the dust produced by the heading head to the side opposite to the driver's station, that is, the other side of the roadway On one side, it can protect the driver from the hazards of high concentration dust.

The above-mentioned metal frame gauze 3 comprises mesh cloth and a metal frame supporting the mesh cloth, and an atomizing nozzle is arranged on the top of the metal frame gauze, and the atomizing nozzle 4 is preferably an outer spiral solid conical nozzle, which is fixed on the On the metal gauze, the spraying direction of the atomizing nozzle is towards the front and down, and the metal frame gauze is set on the other side of the above-mentioned roadway, between the roadheader and the side wall of the roadway, to capture and move to the same (this) side of the roadway of dust. The above-mentioned atomizing nozzles can spray water mist on the metal frame gauze, and cooperate with the gauze to form a dust control water curtain gauze, which is arranged on the opposite side of the driver's station, between the side of the roadheader and the side wall of the roadway. The above-mentioned water curtain gauze traps the high-concentration dust that moves to this side, and further prevents the dust from spreading outward.

The draw-out air duct is suspended on the top plate above the other side of the roadway, the draw-out air duct passes through the metal frame gauze, and the air outlet of the draw-out air duct is located between the metal frame gauze and the tunneling head of the excavation surface. In the dust accumulation area, a trumpet-shaped dust suction hood is installed at the air exhaust port, and the draw-out air duct is connected to the dust removal fan. Then enter the dust removal fan for purification. The above-mentioned draw-out blower is arranged on the roof opposite to the driver's station of the tunnel boring machine, and a trumpet-shaped dust collection cover is used to increase the dust-absorbing area. The draw-out blower is directly connected to the dust removal fan suspended on the roof .

Its working principle is roughly as follows:

When the roadheader cuts, the press-in fan is turned on, and the airflow is blown out by the press-in air cylinder 7 to form an air curtain that can close the entire roadway section, and press the dust to the opposite side of the roadway roadheader driver's station. Open the water supply shut-off valve, the water is transported from the underground water supply pipe to the atomizing nozzle 4 through the water supply hose and nozzle support pipe 5, and sprayed out from the atomizing nozzle 4, and the water mist is sprayed on the metal frame gauze 3 to form a dust control water curtain The gauze prevents the dust from spreading to the manned working area on the working surface, and the water curtain gauze can also directly capture the settled dust. The metal frame gauze 3 is controlled by movable bolts and can be folded onto the boring machine body to allow pedestrians to pass through freely. The trumpet-shaped dust collection cover 2 of the draw-out air duct 6 is arranged in the high-concentration dust accumulation area between the water curtain gauze and the tunneling head. Enter the dust removal fan 8 suspended on the top plate for purification. Since both the draw-out blower and the dust removal fan are hung on the roof of the roadway, the draw-out blower has no folding section, and there is no danger of blowing the blower, which effectively guarantees the air suction volume. The circular trumpet-shaped vacuum hood is made of flame-retardant and anti-explosion polyurethane material, which is light, durable and convenient for workers to move freely.

The technical content not mentioned in the above methods can be realized by adopting or referring to the existing technology.

It should also be noted that under the teaching of this specification, those skilled in the art can also make many easy changes, such as equivalents or obvious modifications; these changes should be within the protection scope of the present invention.

Claims (3)

1. closed dust collection method of driving face is characterized in that may further comprise the steps:

1. above tunnel one side at development machine driver station place, by forced air duct the dedusting air-flow is delivered to the work section part, form the full face air curtain of covering at the work section part, in order to stop dust to spread to the people operating area that has at heading end rear portion, simultaneously, the dust that heading end is produced blows to the tunnel opposite side;

2. arrange gauze at above-mentioned tunnel opposite side, and take to spray mode that water curtain matches with gauze and form and control dirt water curtain gauze, 1. blow the dust that moves to the tunnel homonymy in order to the capture above-mentioned steps;

3. above the opposite side of above-mentioned tunnel, the dust that 2. step traps is concentrated extraction, enter the purified treatment step again by the pull-out type air duct.

2. closed dust pelletizing system of driving face is characterized in that comprising:

One forced blower fan;

One forced air duct, forced air duct is suspended on the top board of tunnel one side top at development machine driver station place, forced air duct is connected with above-mentioned forced blower fan, the air communication that forced blower fan forms is crossed forced air duct and is blown out, but form the air curtain of the whole work section of enclosing tunnel, simultaneously dust is blowed to the tunnel opposite side;

One metal frame gauze, comprise screen cloth and the metal framework that supports screen cloth, top at the metal frame gauze is provided with pulverizing nozzle, the injection direction of pulverizing nozzle is towards the front lower place, the metal frame gauze is arranged on above-mentioned tunnel opposite side, between development machine and tunnel sidewall, blow the dust that moves to the tunnel homonymy in order to capture;

One dedusting fan;

One pull-out type air duct, the pull-out type air duct is suspended on the top board of opposite side top, above-mentioned tunnel, the pull-out type air duct passes the top of metal frame gauze, the dust of the suction opeing of pull-out type air duct between metal frame gauze and development end heading end gathers in the district, the suction opeing place is provided with the dust shield of bell mouth shape, the pull-out type air duct connects dedusting fan, under the effect of dedusting fan, the dust that dust is gathered in the district sucks the pull-out type air duct from dust shield, then enters dedusting fan and carries out purified treatment.

3. the closed dust pelletizing system of driving face according to claim 2 is characterized in that: described metal frame gauze is installed on the side body of development machine, by movable bolt control, can be folded on the body of development machine.

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