CN2296401Y

CN2296401Y - Negative pressure dust trapping device for coal discharge outlet of discharge top coal hydraulic support

Info

Publication number: CN2296401Y
Application number: CN 96217569
Authority: CN
Inventors: 张文平
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-10-19
Filing date: 1996-10-19
Publication date: 1998-11-04
Anticipated expiration: 2006-10-19

Abstract

The utility model discloses a negative pressure dust trapping device composed of a nozzle, a suction and spray barrel, a joint of a dust collecting hood, and a dust collecting hood. The utility model is suitable for the dust prevention of a coal drawing opening and partial gas drainage in the mine. The pressure water is served as the power, and the air in a receiving tube 4 is carried away through the longitudinal turbulent diffusion function of the water particle of nozzle jet to form a negative pressure zone. Under the action of the pressure difference of the inner side and the outer side of the suction and spray barrel, the dust-laden air continuously flows into the receiving tube 4 from the dust collecting hood 11, and is mixed in a venturi along with the flow ejected by the nozzle, at this point, the velocity of the two strands of fluid gradually tend towards consistency, and are finally exhausted after the coal dust of an increasing coupling is sufficiently surrounded and wetted by the water mist. The utility model has the advantages of simple structure, high dust removing effect, easy manufacturing, and convenient installation.

Description

Caving roof coal hydraulic support coal discharge outlet negative pressure dust trapping device

The utility model belongs to coal industry down-hole top-coal caving face synthesis dust prevention device, is mainly used in the coal dust control and the extraction of coal discharge outlet local gas of caving roof coal hydraulic support coal discharge outlet under the coal mine.

At present, under coal mine aspect the sublevel caving hydrau lic support coal discharge outlet dust control technology, usually adopt at the support front-axle beam, nozzle and auto spraying water supply pipline system are installed around side guard board side and the coal discharge outlet, realization moves frame, falls frame, automatically open the valve spraying firing dust when putting coal, but this method water consumption is big and be subjected to the restriction of hydraulic pressure and atomizing effect, the amplitude that reduces respirable dust is little, adopt the method for atomizing de-dusting to be difficult to reach the dustproof purpose of expection at the caving roof coal hydraulic support coal discharge outlet, use traditional spraying firing dust technology to be subjected to certain limitation at coal discharge outlet.Books and periodicals data such as " mine dust Prevention Technique ", " dustproof theory of mine and technology ", " mine dust control " are seen and consulted to the dustproof present situation of caving coal working surface hydraulic support coal discharge outlet as can be known under the present coal mine, and the caving coal working surface hydraulic support coal discharge outlet dirt that goes out is that power generation negative pressure is caught the dirt technology and still belonged to blank with the water under high pressure under the coal mine.

The utility model is big at present caving roof coal hydraulic support coal discharge outlet dust-producing amount, the spraying firing dust poor effect, hang the dust-separation curtain and have problems such as defective, designed a kind of novel by nozzle, inhale the spray tube, the dust shield interface, the sublevel caving hydrau lic support coal discharge outlet negative pressure dust trapping device that dust shield is connected and is sealed into one, its purpose is that the coal dust major part that the sublevel caving hydrau lic support coal discharge outlet is flown upward is got rid of by moistening sedimentation, remainder is being caught dirt system low-voltage distributed area, thereby the coal dust that effectively reduces and control caving coal mouth flies upward to the support sidewalk, most of dust that coal discharge outlet is produced is controlled at certain zone by elimination, and the coal discharge outlet local gas there is the discharging effect of extracting out, thereby improved caving work plane worker's working environment, significant to the generation and the gas and dust explosion accident of control and reduction down-hole top-coal caving face worker pneumoconiosis.

The purpose of this utility model is achieved in that nozzle is installed in the cylinder of supporting location, and nozzle housing and shell and supporting location cylinder are matched in clearance, and are fixed by dog screw; Supporting location cylinder and cylindric adopter, round table-like reducing pipe, cylindric trunnion, round table-like increaser soldering group lump together abbreviation suction spray tube or casting forms; Dust shield is oblate taper and columned dust suction interface, round-meshed gusset piece are connected; Columned dust shield interface is an one with the vertical welded seal that passes through mutually of columned adopter; Suction port section two is to be rectangular combination shape in the middle of the semicircle.

Advantage of the present utility model is, owing to adopt said structure, can effectively catch the respirable dust that goes out, compare with the spraying firing dust that present coal discharge outlet generally uses, dust-laying effect is good, the coal dust major part that produces in the time of making the sublevel caving hydrau lic support coal discharge outlet put coal is caught to go out, effectively having controlled the coal dust that produces when sublevel caving hydrau lic support is put coal spreads to the support sidewalk, utilize the characteristics that produce negative pressure, can make the coal dust that goes out at large be controlled at dust-precipitating system low pressure distributed area, thereby effectively prevent top-coal caving face to put the generation of coal worker and other staff's pneumoconiosis, and the coal discharge outlet local gas had extract discharging effect, its safety benefit out, the social benefit aspect is all significant.

Below in conjunction with accompanying drawing the utility model is further described: Fig. 1 is the longitudinal sectional drawing of caving roof coal hydraulic support coal discharge outlet negative pressure dust trapping device.With reference to Fig. 1, the shell of nozzle 1 and supporting cylinder 3 are matched in clearance, and it is fixing with dog screw 2, adopter 4 left ends and supporting cylinder 3 are welded as a whole or thread connection, adopter 4 right-hand members and the 5 big end welding of round table-like reducing pipe, the round table-like disconnected draw 5 small ends and the welding of trunnion 6 left ends, trunnion 6 rear portions and location gusset piece 8,9 welding, trunnion 6 right-hand members and the welding of round table-like increaser 7 small ends, welding is passed through mutually with adopter 4 bottoms in dust shield interface 10 upper ends, the dust shield 11 upper end sealed attachment of dust shield interface 10 lower ends and oblate taper, oblate taper dust shield 11 rear portions and location gusset piece 12,13 welding.

When practical, it utilizes press water to be power, horizontal turbulent fluctuation diffusion by nozzle 1 water jets particle, air in the adopter 4 is taken away the formation negative pressuren zone, inhaling under the effect of jet pipe inside and outside differential pressure, dust laden air is constantly from dust shield 11, dust suction interface 10 flows into adopter 4, and mix in trunnion with the current that nozzle goes out and to carry out energy exchange, this moment, the speed of two fluid streams tended to consistent gradually, and the increaser coal dust is fully surrounded by water smoke and moisteningly is discharged from last.Simple in structure, explosion-proof performance is good, the efficiency of dust collection height, and handling ease is easy for installation, is applicable to synthesis dust prevention under the coal mine.

Claims

1, a kind of caving roof coal hydraulic support coal discharge outlet negative pressure dust trapping device, comprise nozzle, inhale the spray tube, the dust shield interface, dust shield, it is characterized in that: nozzle is installed in and is matched in clearance in the supporting cylinder (3), and it is fixing with dog screw (2), supporting cylinder (3) is outside to be connected with adopter (4) one ends, the big end of adopter (4) other end and reducing pipe (5) is connected, reducing pipe (5) small end and trunnion (6) one ends are connected, trunnion (6) other end and increaser (7) are connected, trunnion (6) rear portion and location gusset piece (8,9) be connected, adopter (4) bottom is passed through mutually with dust shield interface (10) top and is connected, dust shield interface (10) bottom and dust shield (11) top are connected, dust shield (11) rear portion and location gusset piece (12,13) be connected.