CN202176356U

CN202176356U - Orifice dust extractor for underground of coal mines

Info

Publication number: CN202176356U
Application number: CN2011202740229U
Authority: CN
Inventors: 赵彤宇; 何国益; 郝志国; 周慧峰
Original assignee: Zhengzhou GL Tech Co
Current assignee: Zhengzhou GL Tech Co
Priority date: 2011-07-31
Filing date: 2011-07-31
Publication date: 2012-03-28
Anticipated expiration: 2021-07-31

Abstract

The utility model relates to an orifice dust extractor for underground of coal mines, which comprises a dust collection box. The front side and the rear side of the dust collection box are correspondingly provided with a drill stem inlet and a drill stem outlet for a drill stem to penetrate through, and a slag discharging port is positioned on the lower side of the dust collection box. A first air seal device is arranged at the position of the slag discharging port. The first air seal device encloses a first air seal port communicated with the slag discharging port and is provided with first air jetting holes for blowing dust flying from the inside of the dust collection box to the position of the slag discharging port back into the dust collection box. The first air jetting holes are arranged around the circumference of the first air seal port and respectively provided with air inlet ends connected with air sources and corresponding air jetting ends. The central line of each first air jetting hole gradually draws close to the central line of the first air seal port from the air inlet end to the air jetting end. The orifice dust extractor for the underground of coal mines resolves the problem that an existing orifice dust extractor is difficult to prevent dust from diffusing from a slag discharging port.

Description

Underground mine use aperture grit arrestor

Technical field

The utility model relates to the coal mining field, especially a kind of underground mine use aperture grit arrestor that is used for coal mine down-hole drilling.

Background technology

When in the coal seam, holing; Can produce a lot of dust at the hell downwind side when using wind power slag-discharging, during especially soft, that pulverized coal particle is very thin coal bed drilling operation, can produce amounts of dust in the coal seam; Be full of the entire job scene, even in the whole tunnel that can permeate.Not only threaten and influence the workman of field operation, other workmans to operation in same tunnel also cause very big influence simultaneously.

In order to address the above problem; Application number is that 2010106016013.3 Chinese patent discloses a kind of colliery with intensive shallow bore hole grit arrestor; Said colliery comprises disposal box with intensive shallow bore hole grit arrestor, and both sides are provided with corresponding drilling rod import and drilling rod outlet before and after the said disposal box, and both sides are provided with dedusting mouth and slag-drip opening up and down; Said drilling rod exit is provided with sleeve, and said dedusting mouth place is provided with spray nozzle.When said grit arrestor is worked; The front end of sleeve, promptly the end away from said disposal box embeds rib, and drilling rod is successively through beginning to creep into rib after said drilling rod import and the drilling rod outlet; Thereby the dust that produces in the drilling process is imported in the disposal box through said sleeve; Then dust is sprayed, finally discharge, to reach the depositing dust purpose through said slag-drip opening through said spray nozzle.

Certain depositing dust effect has in use been played with intensive shallow bore hole grit arrestor in above-mentioned colliery; But still there are some problems: 1) because the drilling rod afterbody that use in the colliery mostly is triangle; Therefore conventional hermetically-sealed construction can't be set in the drilling rod import department of said disposal box; And the spray effect of described spray nozzle is limited; Therefore can't the dust that produce in the drilling process fully be drenched, in the process of rod boring, still having the part dust " to escape from " described disposal box through said drilling rod import department influences surrounding environment, promptly can't realize the sealing with the drilling rod cooperation place; 2) said slag-drip opening place does not have the dust-break device, and the slag-drip opening place often becomes the outlet that dust is blown out; What 3) said disposal box adopted is overall structure; And drilling rod is generally longer; And in use need often to change, each disposal box that then must will be sheathed on the drilling rod of changing falls along drilling rod axial " taking off ", has also increased its labour intensity when having reduced staff's operating efficiency; 4) owing to be to adopt said spray nozzle depositing dust, the depositing dust medium is a water, and the foreign material such as dregs that therefore produce in after treatment dust (main component is a coal) and the drilling process are mingled in one and can't realize recycling; In addition, down-hole water intaking also comparatively difficulty and water after pollution caused by coal dust, can't realize recycle, this also makes above-mentioned colliery more inconvenient with the use of intensive shallow bore hole grit arrestor.

Summary of the invention

The purpose of the utility model is to provide a kind of underground mine use aperture grit arrestor that adopts hermetic seal, is difficult to prevent the problem of dust from its slag-drip opening diffusion to solve existing grit arrestor.

In order to address the above problem; The underground mine use aperture grit arrestor of the utility model adopts following technical scheme: underground mine use aperture grit arrestor; Comprise disposal box; The forward and backward both sides correspondence of said disposal box is provided with drilling rod import, the drilling rod outlet that supplies drilling rod to pass; Its downside is provided with slag-drip opening; Said slag-drip opening place is equipped with first air seal set; Said first air seal set surrounds first a sealing gland mouth that is communicated with said slag-drip opening and has and is used for blowing back first fumarole in the disposal box with wafing in the said disposal box to the dust at slag-drip opening place, the week that said each first fumarole is located in the said first sealing gland mouth upwards and have separately and be used for and inlet end that source of the gas connects and corresponding jet end, the center line of each first fumarole all from its inlet end separately extremely jet end draw close gradually to the center line of the said first sealing gland mouth.

Said first air seal set comprises first air inlet pipe; Said first air inlet pipe is located in making progress in week of slag-drip opening and surrounds the slag passage that falls that a coal supply slag drops; Have first gas channel and first air inlet that communicates with said first gas channel in first air inlet pipe, said first fumarole is arranged on the tube wall of the said first air inlet pipe upside and through said first gas channel and the said first air inlet conducting.

The upside of said first air inlet pipe has first inclined-plane of taper, and said first inclined-plane is from bottom to up gradually away from the center line of said slag-drip opening, and said first fumarole is arranged on the described tapered slope.

Be provided with first air baffle ring that is used to prevent from the air-flow of said first fumarole ejection along the adherent walking of internal face of disposal box in the said disposal box in the top of said first air inlet pipe.

Said drilling rod import department is equipped with second air seal set; Said second air seal set surrounds the second sealing gland mouth that a confession drilling rod passes; Second air seal set has and is used for blowing back second fumarole in the disposal box with wafing in the said disposal box to the dust of drilling rod import department; Said each second fumarole is located in making progress in week of the said second sealing gland mouth and has separately and is used for and the inlet end of source of the gas connection and corresponding jet end, and the center line of each second fumarole is all drawn close to the center line of the said second sealing gland mouth from its inlet end separately to jet end gradually.

The jet end of said each second fumarole all has a straight hole section, the center line of the straight hole section of each second fumarole all from front end to the rear end of said disposal box along the circumferencial direction conjugate deviation of the said second sealing gland mouth.

Described second air seal set comprises second air inlet pipe; Said second air inlet pipe surrounds the passage that supplies drilling rod to pass in said drilling rod import department; Second air inlet that second air inlet pipe has second gas channel and is used for said second gas channel is connected with source of the gas; Said each second fumarole is arranged at second air inlet pipe on a side of said drilling rod outlet, and the inlet end of said each second fumarole is through said second gas channel and the second air inlet conducting.

Said second air inlet pipe has second inclined-plane of taper towards a side of the drilling rod outlet of said disposal box; Gradually away from the center line of the said second sealing gland mouth, said second fumarole is arranged on said second inclined-plane from front end to the rear end of said disposal box on said second inclined-plane.

Said air seal set comprises that also sealing is assemblied in the sheath in the said drilling rod import, and said sheath is the tubular of both ends open, and said second air inlet pipe is integrally formed on the inwall of said sheath; Coaxial line is equipped with fire-retardant cover in the said sheath, and said fire-retardant putting has the fire-retardant passage that supplies drilling rod to pass, the internal diameter of the ring that the internal diameter of said fire-retardant passage surrounds less than said air inlet pipe.

One side of the drilling rod outlet in said second air inlet pipe towards said disposal box in the said sheath is provided with and is used to prevent the air-flow that in said second fumarole, sprays second air baffle ring along the adherent walking of internal face of sheath; Have the resistance dirt passage that supplies drilling rod to pass on said second air baffle ring, said resistance dirt passage and center line and the central lines of the said second sealing gland mouth.

Because the underground mine use aperture grit arrestor of the utility model is equipped with first air seal set at the slag-drip opening place of said disposal box; Said first air seal set surrounds first a sealing gland mouth that is communicated with said slag-drip opening and has and is used for blowing back first fumarole in the disposal box with wafing in the said disposal box to the dust at slag-drip opening place; Said each first fumarole is located in making progress in week of the said first sealing gland mouth and has separately and is used for and the inlet end of source of the gas connection and corresponding jet end; The center line of each first fumarole is all drawn close to the center line of the said first sealing gland mouth from its inlet end separately to jet end gradually; Therefore; Can the dust that fall to slag-drip opening in the disposal box be blown back disposal box through the air-flow that in said first fumarole, sprays in use; Prevent the slag-drip opening diffusion of dust, thereby reduce the influence of dust, solved existing grit arrestor and be difficult to prevent the problem of dust from its slag-drip opening diffusion to surrounding environment from said disposal box.

Description of drawings

Fig. 1 is the structural representation of embodiment 1 of the underground mine use aperture grit arrestor of the utility model;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the structural representation of second air seal set among Fig. 2;

Fig. 4 is the stereogram of embodiment 1 of the underground mine use aperture grit arrestor of the utility model.

The specific embodiment

The embodiment 1 of the underground mine use aperture grit arrestor of the utility model shown in Fig. 1-4, has disposal box 1, and the forward and backward side of disposal box 1 is provided with corresponding drilling rod import, drilling rod outlet, and its upper and lower side correspondence is provided with dust mouth, slag-drip opening; The drilling rod import is used to supply corresponding drilling rod to penetrate disposal box 1; The drilling rod outlet is used to supply drilling rod to pass disposal box 1; In addition, when work, can connect corresponding sleeve in the drilling rod exit; And sleeve is plugged on the rib; Thereby the dust that produces in the rod boring process is caused in the disposal box 1 dust mouth is used for connecting through dust outlet tube road 4 and corresponding dust collecting (like filter bag, dedusting tank or dirt, gas, separator), thus with dust (main component is a coal) centralized collection so that later use or focus on and the Device in Gas of following is collected (when adopting dirt, gas, separator); Disposal box 1 adopts split-type structural; Specifically; Be upper case half 1-1 and the bottom half 1-2 that disposal box 1 comprises mutual fastening, the dust mouth is arranged on the upper case half 1-1, and slag-drip opening is arranged on the bottom half 1-2; The relative heavier dregs that are used for supplying boring procedure to produce drop out, can install gathering-device (like collecting box or collecting bag) at described slag-drip opening place additional when specifically using thus the dregs that produce in to boring procedure focus on; The drilling rod import and export surrounds after fastening mutually by upper and lower half chests body; Be hinged with on the front end of bottom half 1-2 can on the check lock lever 5 that turns over; Check lock lever 5 is bolted with lock handle 6 away from an end of its hinged end; Has corresponding clip slot 7 on the corresponding end 1-1 of upper case half; Turn on the check lock lever 5 that the back embeds in the corresponding clip slot and cooperates with the upper end block of clip slot and with upper and lower half chests body locking, the rear end of upper case half and bottom half is provided with the pin-and-hole of correspondence respectively through the fixed block 30 of correspondence through corresponding lock handle, cooperation is located through the alignment pin 31 that is plugged in the respective pin hole in the rear end of upper and lower half chests body.

The slag-drip opening place of disposal box 1 is provided with first air seal set; First air seal set comprises first air inlet pipe 16; First air inlet pipe 16 is used to prevent that dust from dropping out from slag-drip opening; First air inlet pipe 16 surrounds an annular; Its hole that surrounds forms the slag passage that falls that a coal supply slag drops; Also has first air inlet 17 that is used for corresponding source of the gas connection on the tube wall of first air inlet pipe 16; First air inlet, 17 places are provided with and are used to regulate the tap changer 18 of air-flow size and pass through air inlet pipe 19 and 15 conductings of second air inlet; Have first gas channel in first air inlet pipe 16, the circumferencial direction that the upside of first air inlet pipe 16 (towards a side of the dust mouth of disposal box) tube wall is provided with first inclined-plane of corresponding taper and the ring that first air inlet pipe 16 surrounds in upper edge, said first inclined-plane be laid with week that first fumarole, 20, the first fumaroles 20 are located in the said slag passage that falls upwards and form one stop dust to pass through the first sealing gland mouth; It has and is used for and inlet end that source of the gas connects and corresponding jet end; The inlet end of each first fumarole is through the first air inlet conducting of said first gas channel and first air inlet pipe, and wherein first inclined-plane is the processing of first fumarole 20 for ease, first fumarole 20 center line from the lower end (end of the dust mouth of disposal box dorsad) to the upper end gradually near the center line of the said slag passage that falls; The center line of each first fumarole near the center line of the said slag passage that falls after and the angle that forms between the center line of the slag passage that falls be advisable with the 20-45 degree; The jet end of first fumarole all have a straight hole section and each first fumarole the circumferencial direction conjugate deviation of the annular that surrounds along first air inlet pipe 16 of center line, angle excursion is advisable with the 20-45 degree, so also is to be covered with the slag-drip opening of disposal box and to form spiral air flow in order to make from filtering the air-flows that spray in first fumarole 20; Thereby form reliable hermetic seal, prevent that dust from dropping out from the slag-drip opening of disposal box 1; The top of first air inlet pipe is provided with first air baffle ring, 21, the first air baffle rings 21 and is used for making from the air-flow break-in of said first fumarole 20 interior ejections with filter dirt pipe jointing, prevents the adherent walking of its internal face along disposal box.

The drilling rod import department sealing of disposal box 1 is equipped with second air seal set 8; Second air seal set 8 has the sheath 9 that is sealed and matched with disposal box 1; Sheath 9 be both ends open tubular and with the concentricity line setting of drilling rod import; The internal face of sheath is provided with second air inlet pipe 10; Second air inlet pipe 10 surrounds an annular, the second sealing gland mouth that the annular distance formation one of the annular that it surrounds is connected with drilling rod import conducting, and second air inlet pipe 10 forms the passage that the corresponding drilling rod of a confession passes jointly with the drilling rod import; Second air inlet pipe 10 is integrally formed on the internal face of sheath 9; The correspondence position of sheath 9 internal faces forms the outside wall surface of second air inlet pipe 10, and the cross section vertical with its center line of second air inlet pipe 10 is quadrangle, and its inner tube chamber forms second gas channel; Has second air inlet that is used for being connected on the tube wall of second air inlet pipe 10 with source of the gas; Second air inlet is used for second gas channel in second air inlet pipe 10 is connected with corresponding source of the gas, and the periphery that second fumarole, 14, the second fumaroles 14 are located in the second sealing gland mouth that circumferentially is laid with of tube wall upper edge second air inlet pipe 10 of the side that the drilling rod towards disposal box 1 of second air inlet pipe 10 exports makes progress; It has and is used for and inlet end that source of the gas connects and corresponding jet end, and the inlet end of second fumarole is through second air inlet pipe interior second gas channel and the said second air inlet conducting; Second fumarole is used for blowing back in the disposal box 1 wafing in the disposal box to the dust of drilling rod import department; Preventing it discharges from drilling rod import department; The tube wall towards a side of the drilling rod of disposal box outlet of second air inlet pipe 10 be one from front side to the rear side of disposal box 1 gradually away from second inclined-plane of the taper of the center line of said slagging channel; Second fumarole 14 is laid on described second inclined-plane; Made things convenient for processing so widely to second fumarole 14; Reduce its difficulty of processing and cost; The center line of each second fumarole 14 is drawn close to the center line of the said second sealing gland mouth from front side (side of said dorsad drilling rod outlet) to the rear side (towards a side of said drilling rod outlet) of second air inlet pipe gradually, and the angle that the center line of second fumarole is drawn close to the center line of the second sealing gland mouth between the center line of the back and the second sealing gland mouth is advisable with the 20-45 degree; The jet end of each second fumarole 14 all has a straight hole section; The circumferencial direction conjugate deviation of the ring that this straight hole Duan Jun edge second air inlet pipe 10 surrounds; Angle excursion is advisable with the 20-45 degree; Be for the tight described drilling rod import of air bell that makes from said second fumarole 14 ejection like this and form spiral air flow, thereby prevent that better dust from " escaping " to go out from drilling rod import department; Locate to be provided with second air baffle ring 11 in the rear side (a side) of second air inlet pipe 10 in the sheath 9 with second fumarole; Blow back break-in to second air baffle ring 11 from the air-flow that blows out in second fumarole 14; Thereby avoided air-flow along the adherent walking of the internal face of sheath 9, improved its hermetic seal (negative-pressure sealing) performance; Also be equipped with fire-retardant cover 12 in the sheath 9; Fire-retardant cover 12 adopts copper material; It has the fire-retardant passage that a confession drilling rod passes; The internal diameter of the endoporus (being said sealing gland mouth) of the annular that the internal diameter of fire-retardant passage is surrounded less than second air inlet pipe can avoid second air inlet pipe 10 to contact with drilling rod like this, plays the effect of protection second air inlet pipe 10; Fire-retardant cover 12 is divided into two sections in the both sides, front and back of second air inlet pipe 10, and two sections of fire-retardant cover 12 two pressure rings 13 that are connected in the sheath two ends through flange are respectively pressed to establish and are fixed in the sheath 9, certainly, all have the passage that supplies drilling rod to pass on two pressure rings 13; Second air seal set adopts split-type structural equally; Specifically; Be first cover and second cover that sheath 9 comprises mutual fastening, described first puts and is fixed with upper tube half and first plate, and described second puts and be fixed with lower tube half and second plate; Said upper and lower semicanal is spliced to form described second air inlet pipe 10; Said upper and lower half plate is spliced to form said second air baffle ring 11, and said fire-retardant cover 12 and pressure ring 13 all adopt and be divided into the upper and lower two halves formula structure that partly puts simultaneously, and the described disposal box 1 and second air seal set all adopt the split-type structural of mutual fastening; Therefore can the radially both sides of upper and lower half chests body from drilling rod be fastened fast through check lock lever 5, lock handle 6 and the clip slot 7 that correspondence is divided on the upper and lower half chests body in use; The assembling of said second air seal set is shaped, and do not need again with the control of dust housing-case along drilling rod axially put drilling rod, made things convenient for the replacing of drilling rod widely.

Said underground mine use aperture grit arrestor in use can be with the upper and lower half chests body of the disposal box radially fastening from drilling rod; Turn over then said check lock lever make its embed behind corresponding clip slot the described lock handle of turn make it with the corresponding end jam-packed of clip slot can be with upper and lower half chests body quick lock in; Thereby drilling rod is contained; Sleeve through correspondence is sealed and matched the drilling rod outlet of disposal box with rib, thereby the dust that drilling rod is produced in the process of creeping into gets into disposal box, gets into the dust of disposal box because the effect of said second air seal set and first air seal set can't be from the drilling rod import and slag-drip opening discharge of disposal box; Therefore can only discharge disposal box from said dust mouth; Therefore only need to enter corresponding dust collecting so that follow-up use when needing to change drilling rod, only need be unclamped said lock handle through said dust outlet tube road; Under turn over said check lock lever can realize for convenience detach, easy accessibility.

Because the underground mine use aperture grit arrestor in the present embodiment is equipped with said first air seal set in the sealing of the slag-drip opening place of said disposal box; Said first air seal set comprises first air inlet pipe; Said first air inlet pipe is located in making progress in week of slag-drip opening and surrounds the slag passage that falls that a coal supply slag drops; Has first gas channel in first air inlet pipe; Have first air inlet that is used for being connected with source of the gas on its tube wall and be used for dust is upwards blown afloat first fumarole, said first fumarole is arranged at the upside of first air inlet pipe and through said first gas channel and the said first air inlet conducting, therefore; Can the dust that fall to slag-drip opening in the disposal box be blown back disposal box through the air-flow that in said first fumarole, sprays in use; Prevent the slag-drip opening diffusion of dust, thereby reduce the influence of dust, solved existing grit arrestor and be difficult to prevent the problem of dust from its slag-drip opening diffusion to surrounding environment from said disposal box; In addition; Drilling rod import department sealing at said disposal box is equipped with said second air seal set; Said second air seal set surrounds the second sealing gland mouth that a confession drilling rod passes, and second air seal set has and is used for blowing back second fumarole in the disposal box with wafing in the said disposal box to the dust of drilling rod import department, and corresponding drilling rod is passed in the passage of said air seal set and the common formation of drilling rod import; In the process of rod boring; When the dust that produces wafts to said drilling rod import department, can it be blown through the air-flow of said second fumarole ejection and be back to disposal box, prevent dust from the drilling rod import department of disposal box to external diffusion; Owing to be to lean on air seal; Therefore second air seal set does not need to contact with drilling rod, is the drilling rod of Any shape (like triangle, circle etc.) applicable to the cross section, has solved the problem that the drilling rod import department of existing grit arrestor is difficult to seal.

In the foregoing description, described first air seal set can also adopt the one group of shower nozzle that is laid in said slag-drip opening periphery, is about to described first fumarole and is arranged on the described shower nozzle; Second air seal set can also adopt the one group of shower nozzle that is laid in said drilling rod import department; The ring that said second air inlet pipe surrounds can also be Fang Huan; The described disposal box and first air seal set can also adopt monolithic construction separately; Described check lock lever, clip slot and corresponding lock handle can also adopt screw rod or hook, certainly, corresponding screw rod bearing structure (like screwed hole, swivel nut) must be set on upper and lower half chests body in such cases or link up with bearing structure (like otic placode); The sheath of said second air seal set, second air baffle ring and fire-retardant cover all can omit; Existing dedusting mouth also can be adopted in described dust mouth, and promptly the upside at disposal box is provided with spray nozzle to reach the depositing dust purpose.

Claims

1. underground mine use aperture grit arrestor; Comprise disposal box; The forward and backward both sides correspondence of said disposal box is provided with drilling rod import, the drilling rod outlet that supplies drilling rod to pass; Its downside is provided with slag-drip opening; It is characterized in that: said slag-drip opening place is equipped with first air seal set; Said first air seal set surrounds first a sealing gland mouth that is communicated with said slag-drip opening and has and is used for blowing back first fumarole in the disposal box with wafing in the said disposal box to the dust at slag-drip opening place, the week that said each first fumarole is located in the said first sealing gland mouth upwards and have separately and be used for and inlet end that source of the gas connects and corresponding jet end, the center line of each first fumarole all from its inlet end separately extremely jet end draw close gradually to the center line of the said first sealing gland mouth.

2. underground mine use according to claim 1 aperture grit arrestor; It is characterized in that: said first air seal set comprises first air inlet pipe; Said first air inlet pipe is located in making progress in week of slag-drip opening and surrounds the slag passage that falls that a coal supply slag drops; Have first gas channel and first air inlet that communicates with said first gas channel in first air inlet pipe, said first fumarole is arranged on the tube wall of the said first air inlet pipe upside and through said first gas channel and the said first air inlet conducting.

3. underground mine use according to claim 2 aperture grit arrestor; It is characterized in that: the upside of said first air inlet pipe has first inclined-plane of taper; Said first inclined-plane is from bottom to up gradually away from the center line of said slag-drip opening, and said first fumarole is arranged on the described tapered slope.

4. underground mine use according to claim 3 aperture grit arrestor is characterized in that: be provided with first air baffle ring that is used to prevent from the air-flow of said first fumarole ejection along the adherent walking of internal face of disposal box in the said disposal box in the top of said first air inlet pipe.

5. according to each described underground mine use aperture grit arrestor of claim 1-4; It is characterized in that: said drilling rod import department is equipped with second air seal set; Said second air seal set surrounds the second sealing gland mouth that a confession drilling rod passes; Second air seal set has and is used for blowing back second fumarole in the disposal box with wafing in the said disposal box to the dust of drilling rod import department; Said each second fumarole is located in making progress in week of the said second sealing gland mouth and has separately and is used for and the inlet end of source of the gas connection and corresponding jet end, and the center line of each second fumarole is all drawn close to the center line of the said second sealing gland mouth from its inlet end separately to jet end gradually.

6. underground mine use according to claim 5 aperture grit arrestor; It is characterized in that: the jet end of said each second fumarole all has a straight hole section, the center line of the straight hole section of each second fumarole all from front end to the rear end of said disposal box along the circumferencial direction conjugate deviation of the said second sealing gland mouth.

7. underground mine use according to claim 6 aperture grit arrestor; It is characterized in that: described second air seal set comprises second air inlet pipe; Said second air inlet pipe surrounds the passage that supplies drilling rod to pass in said drilling rod import department; Second air inlet that second air inlet pipe has second gas channel and is used for said second gas channel is connected with source of the gas; Said each second fumarole is arranged at second air inlet pipe on a side of said drilling rod outlet, and the inlet end of said each second fumarole is through said second gas channel and the second air inlet conducting.

8. underground mine use according to claim 7 aperture grit arrestor; It is characterized in that: said second air inlet pipe has second inclined-plane of taper towards a side of the drilling rod outlet of said disposal box; Gradually away from the center line of the said second sealing gland mouth, said second fumarole is arranged on said second inclined-plane from front end to the rear end of said disposal box on said second inclined-plane.

9. underground mine use according to claim 8 aperture grit arrestor; It is characterized in that: said air seal set comprises that also sealing is assemblied in the sheath in the said drilling rod import; Said sheath is the tubular of both ends open, and said second air inlet pipe is integrally formed on the inwall of said sheath; Coaxial line is equipped with fire-retardant cover in the said sheath, and said fire-retardant putting has the fire-retardant passage that supplies drilling rod to pass, the internal diameter of the ring that the internal diameter of said fire-retardant passage surrounds less than said air inlet pipe.

10. underground mine use according to claim 9 aperture grit arrestor; It is characterized in that: a side of the drilling rod outlet in said second air inlet pipe towards said disposal box in the said sheath is provided with and is used to prevent the air-flow that in said second fumarole, sprays second air baffle ring along the adherent walking of internal face of sheath; Have the resistance dirt passage that supplies drilling rod to pass on said second air baffle ring, said resistance dirt passage and center line and the central lines of the said second sealing gland mouth.