CN102865095A - Anti-spray dust removing device for bedding drilling - Google Patents
Anti-spray dust removing device for bedding drilling Download PDFInfo
- Publication number
- CN102865095A CN102865095A CN2011101895034A CN201110189503A CN102865095A CN 102865095 A CN102865095 A CN 102865095A CN 2011101895034 A CN2011101895034 A CN 2011101895034A CN 201110189503 A CN201110189503 A CN 201110189503A CN 102865095 A CN102865095 A CN 102865095A
- Authority
- CN
- China
- Prior art keywords
- pipe
- straight tube
- blowout prevention
- dedusting
- injection spray
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Nozzles (AREA)
Abstract
The invention discloses an anti-spray dust removing device for bedding drilling. The anti-spray dust removing device comprises an intra-hole pipe, a straight pipe and a reducer pipe which are connected in turn in a coaxial mode; a dust-removing slag-discharging pipe and an anti-spray pipe are fixed on the side wall of the straight pipe; the inner cavities of the straight pipe, the dust-removing slag-discharging pipe and the anti-spray pipe are mutually communicated; and an exhaust device is arranged on the anti-spray pipe. The anti-spray dust removing device further comprises an outer snap ring shaped spraying pipe which is provided with a plurality of sprayers; a plurality of through holes matched with the sprayers of the outer snap ring shaped spraying pipe are formed in the side wall of the dust-removing slag-discharging pipe in a circumference direction; the sprayers of the outer snap ring shaped spraying pipe are fixed on the side wall of the dust-removing slag-discharging pipe through the through holes; a plurality of through holes matched with the sprayers of the outer snap ring shaped spraying pipe are formed in the side wall of the reducer pipe; and the sprayers of the outer snap ring shaped spraying pipe are fixed on the side wall of the reducer pipe through the through holes. The anti-spray dust removing device is simple, reasonable and compact in structure, overcomes several defects of the prior art, and has the advantages that the use is convenient, coal slag and dust in the construction of bedding drilling can be effectively cleaned, and effective anti-spray is achieved.
Description
Technical field
The present invention relates to the gas pumping technology of drilling, relate in particular to a kind of concordant boring blowout prevention dust arrester.
Background technology
The colliery can produce a large amount of cinders and dust when this coal seam construction mash gas pumping drilling or discharge orifice.At present, usually adopt the cinder of pressing in the wind eliminating boring, cause cinder and dust directly to drain in the tunnel of construction place, serious pollution the working environment of job location, brought harm for field operation worker's health, also there is the potential safety hazard of coal-dust explosion in a large amount of dust simultaneously, and this just requires must accomplish effective depositing dust when the drilling machine construction concordant is holed.Traditional dust collection method is the annular spraying to be set or in construction ground return side full section spraying to be set at drilling orifice, although can play certain dustproof function, the phenomenon that on-the-spot coal dust gathers still exists.In addition, in the large coal seam of gas bearing capacity or during projecting coal bed middle construction concordant boring, if without reliable blowout prevention procedure, gas spray orifice phenomenon occurs very easily, cause the gas exceeding limit accident.
Summary of the invention
The invention provides a kind of concordant boring blowout prevention dust arrester, in order to solve defective of the prior art, realizes easy to use, the cinder when effectively clearing up the concordant drilling construction and dust, the effect of the anti-gas spray orifice of holing.
The invention provides a kind of concordant boring blowout prevention dust arrester, comprising:
Coaxial hole inner tube, straight tube and the reducer pipe that connects in turn, fixing (welding) on the described straight tube sidewall has dedusting scum pipe and lubricator, and described straight tube, dedusting scum pipe and lubricator inner chamber interpenetrate; Be provided with exhaust plant on the described lubricator,
Wild card annular injection spray pipe, described wild card annular injection spray pipe is provided with a plurality of shower nozzles, described dedusting scum pipe sidewall is provided with the through hole supporting with wild card annular injection spray pipe shower nozzle in the circumferential direction of the circle, and the shower nozzle of described wild card annular injection spray pipe passes through hole and is fixed on the dedusting scum pipe sidewall; Described reducer pipe sidewall is provided with the through hole supporting with wild card annular injection spray pipe shower nozzle in the circumferential direction of the circle, and the shower nozzle of described wild card annular injection spray pipe passes through hole and is fixed on the reducer pipe sidewall.
Further, described exhaust plant is the ball valve that is connected with monofilament, and described monofilament is connected with suction rubber tube.
Further, be fixed with a plurality of fixing holes on the described straight tube outer wall, when the work of concordant boring blowout prevention dust arrester, reeve fixing hole, the concordant blowout prevention dust arrester of holing is fixed on top board or the rib.
Further, the fixed point of described lubricator and straight tube is near the hole inner tube, and the fixed point of described dedusting scum pipe and straight tube is near reducer pipe.
Further, described dedusting scum pipe is to the reducer pipe lopsidedness.
Further, described lubricator is to the reducer pipe lopsidedness.
Further, described hole inner tube away from the caliber of an end of straight tube less than its caliber near straight tube one end.
Further, described reducer pipe away from the caliber of an end of straight tube less than its caliber near straight tube one end.
Further, described hole inner tube is connected flange with straight tube and is connected.
Further, described wild card annular injection spray pipe comprises straight length and the bend loss of series connection, is uniformly distributed with shower nozzle on the arc pipe of described bend loss, and the number of described shower nozzle is greater than three.
Concordant boring blowout prevention dust arrester of the present invention, simple and reasonable for structure, compact, have compared with prior art following several respects advantage:
1, simple in structure, with low cost, be easy to make, easy to use and life cycle is long;
2, the effect that has anti-boring gas spray orifice, the gas Abnormal Methane Emission that can occur when drilling in time carries out ejectment, and gas does not transfinite when effectively guaranteeing to drill, and is particularly useful for the work of drilling of the larger coal seam of gas bearing capacity or projecting coal bed concordant hole;
3, the dirt that goes out is respond well, and the dust of discharging of drilling does not directly enter the tunnel, but by hole inner tube, straight tube, enter again the dedusting scum pipe, full face purification water curtain through the annular injection spray pipe of the wild card of dedusting scum pipe produces carries out concentrated dust-removing, at last moistening coal dust is discharged.Simultaneously, the purifying spraying of the annular of the wild card in reducer pipe injection spray pipe generation can prevent effectively that the part dust from overflowing from the reducer pipe end.
Description of drawings
Accompanying drawing is used to provide a further understanding of the present invention, and consists of the part of manual, is used for together with embodiments of the present invention explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
The concordant boring blowout prevention dust arrester structural representation that Fig. 1 provides for the embodiment of the invention two;
Fig. 2 is Fig. 1 China and foreign countries snap ring shape injection spray pipe structural representations;
Fig. 3 is A-A section partial sectional view shown in Figure 1.
By reference to the accompanying drawings, Reference numeral is as follows in the embodiment of the invention:
1-lubricator 2-ball valve 3-monofilament
6-is straight-through for 4-wild card annular injection spray pipe 5-shower nozzle
7-flange 8-dedusting scum pipe 9-straight tube
10-reducer pipe 11-hole inner tube 12-fixing hole
13-reducer pipe flange
The specific embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Embodiment one
The present embodiment provides a kind of concordant boring blowout prevention dust arrester, comprising: coaxial hole inner tube, straight tube and the reducer pipe that connects in turn, be welded with dedusting scum pipe and lubricator on the straight tube sidewall, and straight tube, dedusting scum pipe and lubricator inner chamber interpenetrate; Be provided with exhaust plant on the lubricator, the gas that occurs when being used for bleeder off hole effectively prevents the drilling gas spray orifice.
Wild card annular injection spray pipe, wild card annular injection spray pipe is provided with a plurality of shower nozzles, dedusting scum pipe sidewall is provided with the through hole supporting with wild card annular injection spray pipe shower nozzle in the circumferential direction of the circle, the shower nozzle of wild card annular injection spray pipe passes through hole and is fixed on the dedusting scum pipe sidewall, the wild card annular injection spray pipe that is fixed on the dedusting scum pipe sidewall can produce full section purification water curtain, the cinder and the floating dust that produce in the boring is moistening, discharge by the dedusting scum pipe; The reducer pipe sidewall is provided with the through hole supporting with wild card annular injection spray pipe shower nozzle in the circumferential direction of the circle, the shower nozzle of wild card annular injection spray pipe passes through hole and is fixed on the reducer pipe sidewall, be fixed on the purifying spraying that the wild card annular injection spray pipe on the reducer pipe sidewall produces, can effectively stop dust to overflow from the reducer pipe mouth of pipe.
Concordant boring blowout prevention dust arrester of the present invention is easy to use, the hole inner tube is inserted in the pre-prepd working hole, drilling rod and the drill bit axis direction along reducing pore, straight tube and inner tube is inserted in the working hole, open the penstock of two wild card annular injection spray pipes, start drilling rod and drill bit and can realize concordant boring, the gas that produces when boring is discharged via lubricator, ball valve and monofilament, the cinder that produces and dust being through wetting the discharge by the dedusting scum pipe of wild card annular injection spray pipe, and the upper outside snap ring shape of reducer pipe injection spray pipe effective overflowing of stoping dust be set.
Embodiment two
The concordant boring blowout prevention dust arrester structural representation that Fig. 1 provides for the embodiment of the invention two; Fig. 2 is Fig. 1 China and foreign countries snap ring shape injection spray pipe structural representations; Fig. 3 is A-A section partial sectional view shown in Figure 1.
As shown in Figure 1, concordant boring blowout prevention dust arrester comprises: coaxial hole inner tube 11, straight tube 9 and the reducer pipe 10 that connects in turn.Hole inner tube 11 is connected with straight tube 9 by flange 7, straight tube 9 and reducer pipe 10 welding.Less than its caliber near straight tube 9 one ends, hole inner tube 11 adopts the processing of φ 133mm steel pipe away from an end of straight tube 9 to hole inner tube 11, connects φ 219mm flange 7 near straight tube 9 one end reducings away from the caliber of an end of straight tube 9.Reducer pipe 10 away from the caliber of an end of straight tube 9 less than its caliber near straight tube 9 one ends, reducer pipe 10 connects φ 219mm straight length near straight tube 9 one ends, to φ 133mm, reducer pipe 10 is reducer pipe flange 13 away from the termination of straight tube 9 one ends away from an end reducing of straight tube 9 for it.
Be welded with dedusting scum pipe 8 and lubricator 1 on straight tube 9 sidewalls, straight tube 9, dedusting scum pipe 8 and lubricator 1 inner chamber interpenetrate.The pad of lubricator 1 and straight tube 9 is near hole inner tube 11, and the pad of dedusting scum pipe 8 and straight tube 9 is near reducer pipe 10.Dedusting scum pipe 8 is to reducer pipe 10 lopsidedness, and lubricator 1 is also to reducer pipe 10 lopsidedness.Dedusting scum pipe 8 is arranged on the both sides that straight tube 9 sidewalls deviate from mutually with lubricator 1, and lubricator 1 upwards is convenient to collection and the discharge of gas during use, and dedusting scum pipe 8 is convenient to the collection of cinder and dust downwards.Fluid mechanics principle is followed in dedusting scum pipe 8 and the setting of lubricator 1 on straight tube 9, is convenient to reclaim the waste gas waste residue.
Lubricator is welded by the long 2 inches iron pipes of 200mm, is provided with on the lubricator 1 and installs the long monofilament 3 of 15cm on 2 inches ball valves 2, the ball valve 2, the gas of Abnormal Methane Emission when being used for timely bleeder off hole.Monofilament 3 is connected with 2.5 inches suction rubber tubes of sunkening cord, the extraction pipeline of suction rubber tube and job site links together, gas amount more also can be well introduced aperture gas in the extraction pipeline in the process mesopore of drilling, thereby avoids the gas exceeding limit accident that causes because drilling.
Be fixed with four fixing holes 12 (as hanging nut) on straight tube 9 outer walls, the nut bore of passing fixing hole 12 and reducer pipe flange 13 with seizing wire or crude iron silk when the work of concordant boring blowout prevention dust arrester is fixed on the concordant blowout prevention dust arrester of holing on top board or the rib.
As seen from Figure 1, respectively install one group of wild card annular injection spray pipe 4 on dedusting scum pipe 8 and the reducer pipe 10.The present embodiment comprises two wild card annular injection spray pipes 4, structure as shown in Figure 2,6 minutes galvanized pipes of wild card annular injection spray pipe 4 usefulness are made, wild card annular injection spray pipe 4 is divided into straight length and the bend loss that comprises series connection, the straight length termination is provided with straight-through 6, wild card annular injection spray pipe 4 water inlet ends straight-through 6 are fixed by welding on dedusting scum pipe 8 outer walls and then are communicated with outside supply channel, and outside two-way feed pipe respectively arranges a ball valve, in order to the size of the water yield in the process of drilling is controlled.Bend loss totally is 270 degree circular arcs, is 120 degree on the arc pipe of bend loss and is uniformly distributed with three single hole shower nozzles 5, and namely three shower nozzles 5 are 120 ° and are evenly distributed on dedusting scum pipe 8 and reducer pipe 10 sidewalls.Wild card annular injection spray pipe 4 for installing on reducer pipe 10 sidewalls shown in Figure 2, one of ordinary skill in the art will appreciate that: the number of shower nozzle 5 can for more, can suitably be added according to the cinder that produces in the actual condition or Dust Capacity.
The use step of the present embodiment: during the concordant drilling construction, at first according to the drill bit construction drill perforate section of data of holes drilled with diameter 133mm, after drill bit creeps into 1.2m, stop boring with pressing cinder in the wind clear opening, withdraw from drilling rod and drill bit, with hand-hole inner tube 11 under the "painted-face" character in opera, hole inner tube 11 puts in place and connects straight tubes 9 with bolt by flange 7 afterwards, after hanging straight tube 9 firmly with fixing hole 12, again drilling rod and applicable drill bit are penetrated reducer pipe flange 13 along axis direction, open the water supply valve of wild card annular injection spray pipe 4.Cinder and dust enter straight tube 9 during boring, cinder and dust enter rapidly dedusting scum pipe 8 and reducer pipe 10 pressing under the wind effect, and coal dust or coal slime are discharged from the end opening of dedusting scum pipe 8 under the effect of the formed full section purification water curtain of the annular of the wild card on dedusting scum pipe 8 and the reducer pipe 10 injection spray pipe 4; When if coal seam gas-bearing capacity is larger or projecting coal bed, need before the boring in advance to connect by the sunken cord extraction system at suction rubber tube and the place of being connected of monofilament 3 usefulness at lubricator 1 place, aperture gas is large or need in time open the ball valve 2 at lubricator 1 place when spray orifice occurring when drilling, the timely ejectment of gas Abnormal Methane Emission that occurs during boring, gas does not transfinite when effectively guaranteeing to drill, and preferably economic benefit and safety benefit are arranged after the popularization.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a concordant boring blowout prevention dust arrester is characterized in that, comprising:
Coaxial hole inner tube, straight tube and the reducer pipe that connects in turn is fixed with dedusting scum pipe and lubricator on the described straight tube sidewall, and described straight tube, dedusting scum pipe and lubricator inner chamber interpenetrate, and are provided with exhaust plant on the described lubricator; And
Wild card annular injection spray pipe, described wild card annular injection spray pipe is provided with a plurality of shower nozzles, described dedusting scum pipe sidewall is provided with the through hole supporting with wild card annular injection spray pipe shower nozzle in the circumferential direction of the circle, and the shower nozzle of described wild card annular injection spray pipe passes through hole and is fixed on the dedusting scum pipe sidewall; Described reducer pipe sidewall is provided with the through hole supporting with wild card annular injection spray pipe shower nozzle in the circumferential direction of the circle, and the shower nozzle of described wild card annular injection spray pipe passes through hole and is fixed on the reducer pipe sidewall.
2. described concordant boring blowout prevention dust arrester according to claim 1 is characterized in that, described exhaust plant is the ball valve that is connected with monofilament, and described monofilament is connected with suction rubber tube.
3. described concordant boring blowout prevention dust arrester according to claim 1 is characterized in that, is fixed with a plurality of fixing holes on the described straight tube outer wall.
4. described concordant boring blowout prevention dust arrester according to claim 1 is characterized in that, the fixed point of described lubricator and straight tube is near the hole inner tube, the close reducer pipe of the fixed point of described dedusting scum pipe and straight tube.
5. according to claim 1 or 4 described concordants boring blowout prevention dust arresters, it is characterized in that, described dedusting scum pipe is to the reducer pipe lopsidedness.
6. according to claim 1 or 4 described concordants boring blowout prevention dust arresters, it is characterized in that, described lubricator is to the reducer pipe lopsidedness.
7. described concordant boring blowout prevention dust arrester according to claim 1 is characterized in that, described hole inner tube away from the caliber of an end of straight tube less than its caliber near straight tube one end.
8. described concordant boring blowout prevention dust arrester according to claim 1 is characterized in that, described reducer pipe away from the caliber of an end of straight tube less than its caliber near straight tube one end.
9. according to claim 1 or 7 described concordants boring blowout prevention dust arresters, it is characterized in that, described hole inner tube is connected flange with straight tube and is connected.
10. described concordant boring blowout prevention dust arrester according to claim 1 is characterized in that, described wild card annular injection spray pipe comprises straight length and the bend loss of series connection, is uniformly distributed with shower nozzle on the arc pipe of described bend loss, and the number of described shower nozzle is greater than three.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101895034A CN102865095A (en) | 2011-07-07 | 2011-07-07 | Anti-spray dust removing device for bedding drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101895034A CN102865095A (en) | 2011-07-07 | 2011-07-07 | Anti-spray dust removing device for bedding drilling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102865095A true CN102865095A (en) | 2013-01-09 |
Family
ID=47444196
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101895034A Pending CN102865095A (en) | 2011-07-07 | 2011-07-07 | Anti-spray dust removing device for bedding drilling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102865095A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107191153A (en) * | 2017-07-31 | 2017-09-22 | 辽宁工程技术大学 | A kind of mining drilling is drilled spraying-preventing system |
| CN107461164A (en) * | 2017-09-26 | 2017-12-12 | 绵阳行吉科技有限公司 | A kind of gas prevention protrudes deduster |
| CN111608720A (en) * | 2020-06-04 | 2020-09-01 | 常州鸣人信息科技有限公司 | Dust falling device for mine |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85204041U (en) * | 1985-09-11 | 1986-09-24 | 湖南省煤炭科学研究所 | Pneumatic chip removal device for dry drilling |
| GB2409418A (en) * | 2002-09-13 | 2005-06-29 | Johnson Leslie Vincent P | Dust scrubber |
| CN200961487Y (en) * | 2006-10-20 | 2007-10-17 | 周连春 | Gas-exhausting drilling dust-removing device |
| CN101915115A (en) * | 2010-08-18 | 2010-12-15 | 郑州市光力科技发展有限公司 | Protective device for mine drilling construction |
| CN201753613U (en) * | 2010-08-11 | 2011-03-02 | 义马煤业集团股份有限公司新安煤矿 | Collector used for outburst prevention |
| CN201851067U (en) * | 2010-11-16 | 2011-06-01 | 永贵能源开发有限责任公司 | Drilling anti-jet orifice device |
| CN202176354U (en) * | 2011-07-07 | 2012-03-28 | 淮南矿业(集团)有限责任公司 | Blowout prevention and dust collection device for hole drilled along seam |
-
2011
- 2011-07-07 CN CN2011101895034A patent/CN102865095A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85204041U (en) * | 1985-09-11 | 1986-09-24 | 湖南省煤炭科学研究所 | Pneumatic chip removal device for dry drilling |
| GB2409418A (en) * | 2002-09-13 | 2005-06-29 | Johnson Leslie Vincent P | Dust scrubber |
| CN200961487Y (en) * | 2006-10-20 | 2007-10-17 | 周连春 | Gas-exhausting drilling dust-removing device |
| CN201753613U (en) * | 2010-08-11 | 2011-03-02 | 义马煤业集团股份有限公司新安煤矿 | Collector used for outburst prevention |
| CN101915115A (en) * | 2010-08-18 | 2010-12-15 | 郑州市光力科技发展有限公司 | Protective device for mine drilling construction |
| CN201851067U (en) * | 2010-11-16 | 2011-06-01 | 永贵能源开发有限责任公司 | Drilling anti-jet orifice device |
| CN202176354U (en) * | 2011-07-07 | 2012-03-28 | 淮南矿业(集团)有限责任公司 | Blowout prevention and dust collection device for hole drilled along seam |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107191153A (en) * | 2017-07-31 | 2017-09-22 | 辽宁工程技术大学 | A kind of mining drilling is drilled spraying-preventing system |
| CN107461164A (en) * | 2017-09-26 | 2017-12-12 | 绵阳行吉科技有限公司 | A kind of gas prevention protrudes deduster |
| CN111608720A (en) * | 2020-06-04 | 2020-09-01 | 常州鸣人信息科技有限公司 | Dust falling device for mine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105964124A (en) | Rotary spraying dust removal and desulfurization device | |
| CN108889480B (en) | Soluble particulate matter spraying device and cleaning method | |
| CN202176354U (en) | Blowout prevention and dust collection device for hole drilled along seam | |
| CN102865095A (en) | Anti-spray dust removing device for bedding drilling | |
| CN103949125B (en) | A kind of smoke and dust purifier | |
| CN104399336A (en) | Boiler dust collector and dust collection method | |
| CN108005598B (en) | Gas jet dust remover for mine drilling | |
| CN202756009U (en) | Mining drilling dust removal and gas drainage device | |
| CN112554818B (en) | Device for removing dust and preventing gas from exceeding limit in underground construction drilling and using method | |
| CN219425162U (en) | Automatic deashing dust removal pipeline | |
| CN107604122B (en) | Movable smoke hood for converter waste heat boiler | |
| CN202844684U (en) | Filter with self-cleaning and anti-blocking functions | |
| CN204943044U (en) | A kind of device removed for gas pipe line impurity | |
| CN201482356U (en) | Blowing mechanism of flue gas processing device | |
| CN204337939U (en) | Boiler dust remover | |
| CN205226864U (en) | Filter type natural gas trap | |
| CN201669048U (en) | Double-tower high-efficient dust removal desulfurization device | |
| CN219691580U (en) | Deslagging, dust-reducing and water-draining device for gas extraction pipeline | |
| CN219441215U (en) | Flue gas desulfurization pipeline with purification performance | |
| CN220990110U (en) | Filter cartridge end cover with high-flow drainage structure | |
| CN217674565U (en) | Simple annular blowing ash removal device for steel mill | |
| CN221051906U (en) | Novel ash conveying pipeline equipment for dry dedusting | |
| CN210057716U (en) | Quick disassembly mechanism of jetting pipe | |
| CN214741179U (en) | Dust removal device for pneumatic drilling of directional drilling machine | |
| CN219596139U (en) | Quick assembly disassembly structure of jetting pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20130109 |