CN105604494A - Telescopic drill pipe and mixing pile machine with same - Google Patents
Telescopic drill pipe and mixing pile machine with same Download PDFInfo
- Publication number
- CN105604494A CN105604494A CN201511021903.9A CN201511021903A CN105604494A CN 105604494 A CN105604494 A CN 105604494A CN 201511021903 A CN201511021903 A CN 201511021903A CN 105604494 A CN105604494 A CN 105604494A
- Authority
- CN
- China
- Prior art keywords
- drilling rod
- drill pipe
- telescopic
- interior
- rod
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 239000002002 slurry Substances 0.000 claims abstract description 7
- 238000005553 drilling Methods 0.000 claims description 154
- 241001074085 Scophthalmus aquosus Species 0.000 claims 1
- 241000949477 Toona ciliata Species 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 13
- 230000009466 transformation Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000009182 swimming Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
Abstract
The invention discloses a telescopic drill pipe and a mixing pile machine with the same. An outer drill pipe adopts a multistage clamping groove type telescopic outer drill pipe; an inner drill pipe adopts a multistage screw nut or multistage telescopic hydraulic cylinder telescopic inner drill pipe; the telescopic outer drill pipe and the telescopic inner drill pipe are looped into a whole body layer by layer; the top of the outer drill pipe in the outermost layer of the telescopic outer drill pipe is connected with external power; the top of the inner drill pipe in the innermost layer of the telescopic inner drill pipe is fixed to transmission shaft used for conveying slurry and clutching feeding; the bottom of the outer drill pipe in the innermost layer of the telescopic outer drill pipe and the bottom of the inner drill pipe in the outermost layer of the telescopic inner drill pipe are fixed on the same bottom connecting disc, so that the telescopic outer drill pipe and the telescopic inner drill pipe are linked. The telescopic drill pipe and the mixing pile machine can perform mixing pile construction in limited condition, such as construction under high-voltage power lines in the field, construction beside existing railway lines, and construction in plants. Compared with the prior art adopting high pressure jet grouting piles, the telescopic drill pipe and the mixing pile machine are low in cost, do not pollute the environment, and solve the problem of transformation of railways caused when the high pressure jet grouting piles are adopted during construction beside the existing railway lines.
Description
Technical field
The present invention relates to a kind of mixing pile machine, especially a kind of telescopic drill rod and the stirring with telescopic drill rodStake machine.
Background technology
In the mixing pile construction of railway, highway, building, municipal administration, water conservancy, port engineering, conventionally canRun into limited space operating mode, for example, in the construction of field high-voltage line, existing railway line side dressing work, factory building, executeWork etc. General mixing pile machine height can not meet construction needs, so existing construction adopts high pressure conventionallyRotary churning pile solves, and its drawback is that cost is high, contaminated environment and easily cause existing railway track deformation, shadowRinging existing railway normally runs.
Summary of the invention
Technical problem to be solved by this invention is that a kind of telescopic drill rod and stirring with telescopic drill rod are providedMix a machine, simple in structure, scalable creeping into, is applicable to narrow space construction.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of telescopic drill rod, bagDraw together outer drilling rod and interior drilling rod, outer drilling rod is the flexible outer drilling rod of multistage card slot type, and interior drilling rod is multistage leading screw silkThe interior drilling rod that stretches of mother or multi-stage hydraulic expansion cylinder, flexible outer drilling rod and flexible interior drilling rod ring set from level to levelTogether; The outer drilling rod of the outermost one deck top of described flexible outer drilling rod is connected on external connection power, in stretchingDrilling rod in one deck drilling rod top be fixed on the power transmission shaft for delivery of slurries, clutch feeding, stretchThe outer drilling rod of contracting in the outer drilling rod of one deck bottom with flexible in outermost one deck of drilling rod drilling rod bottom fixOn the terminal pad of same bottom, make flexible outer drilling rod and flexible interior drilling rod interlock.
Described flexible in drilling rod be round bur bar, the outer wall of drilling rod is along being axially provided with external screw thread in every gradeUndergauge section, the top of undergauge section, bottom form upper step and lower stage with the outer wall of interior drilling rod respectivelyRank, in except one deck in the upper inside wall of other interior drilling rods at different levels of drilling rod be formed with a circle surface withThe interior step of internal thread, the internal thread of interior step coordinates with the external screw thread of the undergauge section of drilling rod in internal layer, outerIn layer, the inwall of drilling rod coordinates with the outer surface of the lower step of drilling rod in internal layer.
Described flexible outer drilling rod is kelly bar or round bur bar, and the inwall of every grade of outer drilling rod is along being axially provided withExtension diameter section, top, the bottom of extension diameter section form outer drilling rod upper step and outer with the inwall of outer drilling rod respectivelyDrilling rod lower step, is formed with one on the outer wall top of other outer drilling rods at different levels of drilling rod except outermost one deckEnclose outer step, the outside dimension of outer step coordinates with the internal diameter size of outer outer drilling rod extension diameter section, outside internal layerThe outer wall of drilling rod coordinates with the inwall of the lower step of outer outer drilling rod.
Drilling rod except outermost layer, the structure of every grade of outer drilling rod of flexible outer drilling rod is identical, described except innermost layerInterior drilling rod, in stretching, in every grade of drilling rod, the structure of drilling rod is identical.
Lower step is not formed at the inwall bottom of the outer drilling rod of described innermost layer; Described outermost interior drilling rodOuter wall bottom do not form lower step.
With the mixing pile machine of above-mentioned telescopic drill rod, it is characterized in that, comprise a frame, along stake machineThe mounting platform that frame moves up and down is provided with motor and slew gear on mounting platform, described turn-around machineStructure comprises the key and the trunnion axis that are connected with horizontally disposed motor shaft, and it is 90 that trunnion axis drives a crossed axis angleThe a pair of bevel gear pair of degree, for delivery of the bottom of the power transmission shaft of slurries, clutch feeding through passive umbrellaThe mesopore of generating gear, the top of power transmission shaft is provided with built-in one body swimming joint, and in interior one deck, drilling rod is solidFix on the bottom of power transmission shaft, outer drilling rod terminal pad is fixed on the below of passive bevel gear, outside outermost one deckDrilling rod is fixed on outer drilling rod terminal pad, and drill bit is fixed on the terminal pad of bottom, at the outside of power transmission shaft coverThere is the clutch of controlling power transmission shaft.
Described clutch is mechanical clutch or electromagnetic clutch.
The invention has the beneficial effects as follows: can under limited space operating mode, carry out mixing pile construction, for example,Construction etc. in construction under the high-voltage line of field, existing railway line side dressing work, factory building. Adopt with existing constructionHigh-pressure rotary jet grouting pile comparison, cost is low, free from environmental pollution, has solved employing high-pressure rotary jet grouting pile at existing railwayThe existing trajectory problem on deformation that line side dressing causes man-hour.
Brief description of the drawings
Fig. 1 is the general structure sketch of the mixing pile machine with telescoping mechanism of the present invention while stretching out.
Structure diagram when Fig. 2 is the retraction of the mixing pile machine with telescoping mechanism of the present invention.
Structure diagram when Fig. 3 is telescopic drill rod retraction of the present invention.
Fig. 4 is the structure diagram of telescopic drill rod of the present invention while stretching out.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
As shown in Figure 1,2,3, 4, telescopic drill rod of the present invention, comprises outer drilling rod and interior drilling rod, outerDrilling rod is the flexible outer drilling rod of multistage card slot type, and interior drilling rod is multistage screw-nut or multi-stage hydraulic expansion cylinderFlexible in drilling rod, flexible outer drilling rod and drilling rod in stretching are from level to level together with ring set; Described flexible outer boringThe outer drilling rod of outermost one deck of bar top is connected on external connection power, flexible in drilling rod in drilling rod in one deckTop is fixed on the power transmission shaft for delivery of slurries, clutch feeding, flexible outer drilling rod in outside one deckDrilling rod bottom is fixed on the terminal pad of same bottom with the interior drilling rod of the outermost one deck bottom of flexible interior drilling rod, makesFlexible outer drilling rod and flexible interior drilling rod interlock.
Described flexible in drilling rod be round bur bar, the outer wall of drilling rod is along being axially provided with external screw thread in every gradeUndergauge section 50, the top of undergauge section, bottom form upper step 34 and with the outer wall of interior drilling rod respectivelyLower step 24, in except one deck in, the upper inside wall of other interior drilling rods at different levels of drilling rod is formed with a circleThe female interior step 33 of surface band, the undergauge section 50 of drilling rod in the internal thread of interior step 33 and internal layerExternal screw thread coordinate, outer in the inwall of drilling rod join with the outer surface of the lower step 24 of the interior drilling rod of internal layerClose.
Described flexible outer drilling rod is kelly bar or round bur bar, and the inwall of every grade of outer drilling rod is along being axially provided withExtension diameter section 60, top, the bottom of extension diameter section form outer drilling rod upper step with the inwall of outer drilling rod respectively44 and outer drilling rod lower step 45, on the outer wall of other outer drilling rods at different levels of drilling rod except outermost one deckPortion is formed with the outer step 46 of a circle, in the outside dimension of outer step 46 and outer outer drilling rod extension diameter section 60Footpath dimensional fits, the outer wall of the outer drilling rod of internal layer coordinates with the inwall of the lower step 45 of outer outer drilling rod.
Drilling rod except outermost layer, the structure of every grade of outer drilling rod of flexible outer drilling rod is identical, described except innermost layerInterior drilling rod, in stretching, in every grade of drilling rod, the structure of drilling rod is identical. The inwall of the outer drilling rod of described innermost layerLower step 45 is not formed at bottom; Lower step is not formed at the outer wall bottom of described outermost interior drilling rod24。
With the mixing pile machine of above-mentioned telescopic drill rod, comprise a frame 30, upper and lower along stake frame 30Mobile mounting platform 8 is provided with motor 9 and slew gear, described turn-around machine on mounting platform 8Structure comprises the key 10 and the trunnion axis 11 that are connected with horizontally disposed motor shaft, and trunnion axis 11 drives an axle to hand overAngle is a pair of bevel gear pair of 90 degree, for delivery of the bottom of the power transmission shaft 13 of slurries, clutch feedingThrough the mesopore of passive bevel gear 16, the top of power transmission shaft 13 is provided with built-in one body swimming joint 40,In interior one deck, drilling rod 18 is fixed on the bottom of power transmission shaft 13, and it is passive that outer drilling rod terminal pad 17 is fixed onThe below of bevel gear 16, the outer drilling rod 7 of outermost one deck is fixed on outer drilling rod terminal pad 17, drill bit 1Be fixed on the terminal pad 2 of bottom, in the outside of power transmission shaft 13, cover has the clutch 14 of controlling power transmission shaft 13.
Described clutch 14 is mechanical clutch or electromagnetic clutch.
Describe as an example of one group 5 layers 4 flexible telescopic drill rod example below:
On the platform 8 moving up and down along stake frame 30, motor 9 and slew gear are housed, slew gear bagDraw together key 10, trunnion axis 11, initiatively bevel gear 12, passive bevel gear 16, outer drilling rod terminal pad 17,The top of power transmission shaft 13 is provided with built-in one body swimming joint 40, and power transmission shaft 13 is equipped with clutch 14,The present embodiment is mechanical clutch, comprises taper sheath and the axis of cone, and telescopic drill rod is equipped with in slew gear below,Comprise flexible outer drilling rod 3,4,5,6,7, flexible interior drilling rod 18,19,20,21,22, outside stretchingThis example of drilling rod is kelly bar, and interior drilling rod is round bur bar. In, outer drilling rod is by the soldered one-tenth of bottom terminal pad 2One, drill bit 1 is bolted below terminal pad 2.
The operation principle of this structure is as follows: the motor shaft that is arranged on motor 9 on platform 8 is with by key 10Moving trunnion axis 11 rotates, and trunnion axis 11 drives initiatively bevel gear 12 to rotate, initiatively bevel gear 12Drive passive bevel gear 16 to rotate, passive bevel gear 16 drives outer drilling rod terminal pad 17 to rotate,Outer drilling rod terminal pad 17 drives outermost layer kelly bar 7,7 to be with 6,6 to be with 5,5 to be with 4,4 to be with 3 rotations. 3Drive drilling rod 22 in outermost layer to rotate by terminal pad 2,22,21,20,19,18 is respectively by contractingFootpath section 55, the internal and external screw thread fastness forming with female interior step 33. Due to 22,21,20,19,18 diameters successively decrease successively, are that the fastness 19 of diameter minimum rotates in theory, drive downwards20,21,22 move down the lower plane of the interior step 33 on the top on 19 and 20 lower stageWhen the upper plane contact on rank, produce very large frictional force, when frictional force is greater than the second level 19 and 20 screw threadsWhile paying frictional force, can make second level screw thread pay rotation, impel 20 rotations to stretch out. And the rubbing of contact surfaceWiping power is easy to be bigger than the frictional force that screw thread is paid, by that analogy, until drilling rod 22 rotations are stretched in outermost layerGo out, after stretching out and putting in place, motor reversal, retraction process principle with stretch out identically, screw mandrel starts to rise step by stepContraction completes once circulation, according to the technological requirement of stake, completes flexible number of times, pile. Stake machine is displaced toNext position.
The flexible principle of outer drilling rod is: when interior drilling rod is rotated down while stretching out, in theory due to gravity and the arm of forceReason, drives outer drilling rod 6 to stretch out, when the lower plane of the outer step 46 on outer drilling rod 6 tops drop toIn the lower step 45 of the fixing outer drilling rod 7 of outermost layer, when plane, block, stop stretching out lower one deckOuter drilling rod 5 continues to stretch out, and in like manner analogizes, until outer drilling rod 3 rotations of innermost layer are stretched out.
In the present embodiment, clutch 14 is cone clutch, when feeding, for closing state, ensures line shaft 13Do not turn, thereby in fixing, drilling rod 18 does not rotate, in the time that feeding runs into hard formation or rock, use lever 15 willClutch is opened, and makes drilling rod stop powerful feeding, ensures that parts are not destroyed. Utilize pulley 31 and establishStandby deadweight is slided rear rise by platform 8 along the column of stake frame 30.
In above-described embodiment, slew gear is bevel gear mechanism, and spur gear, worm gear and other mechanism also canWith. Adopt mixing pile machine of the present invention, also can adopt the method for simple extension arm, but poor practicabilityOnce.
In sum, content of the present invention is not limited in the above-described embodiment, having in same areaThe scholar of knowledge can propose easily other embodiment within technological guidance's thought of the present invention, but thisPlanting embodiment all comprises within the scope of the present invention.
Claims (7)
1. a telescopic drill rod, comprises outer drilling rod and interior drilling rod, it is characterized in that, outer drilling rod is multistageThe card slot type outer drilling rod that stretches, interior drilling rod is to bore in multistage screw-nut or multi-stage hydraulic expansion cylinder flexibleBar, flexible outer drilling rod and drilling rod in stretching are from level to level together with ring set; The outermost one of described flexible outer drilling rodLayer outer drilling rod top is connected on external connection power, flexible in drilling rod in the interior drilling rod of one deck top be fixed toOn power transmission shaft for delivery of slurries, clutch feeding, flexible outer drilling rod in one deck outer drilling rod bottom andIn flexible, in outermost one deck of drilling rod, drilling rod bottom is fixed on the terminal pad of same bottom, makes flexible outer drilling rodWith flexible interior drilling rod interlock.
2. telescopic drill rod according to claim 1, is characterized in that, described flexible interior drilling rod isRound bur bar, the outer wall of drilling rod is along being axially provided with externally threaded undergauge section (50), undergauge in every gradeTop, the bottom of section form upper step (34) and lower step (24) with the outer wall of interior drilling rod respectively,In except one deck in, the upper inside wall of other interior drilling rods at different levels of drilling rod is formed with a circle surface with interiorThe interior step (33) of screw thread, the undergauge section (50) of drilling rod in the internal thread of interior step (33) and internal layerExternal screw thread coordinate, outer in the inwall of drilling rod and the outer surface of the lower step (24) of the interior drilling rod of internal layerCoordinate.
3. telescopic drill rod according to claim 1 and 2, is characterized in that, described flexible outer boringBar is kelly bar or round bur bar, and the inwall of every grade of outer drilling rod, along being axially provided with extension diameter section (60), expandsTop, the bottom of footpath section form outer drilling rod upper step (44) and outer drilling rod with the inwall of outer drilling rod respectivelyLower step (45), is formed with on the outer wall top of other outer drilling rods at different levels of drilling rod except outermost one deckThe one outer step of circle (46), the outside dimension of outer step (46) and outer outer drilling rod extension diameter section (60)Internal diameter size coordinates, and the outer wall of the outer drilling rod of internal layer is joined with the inwall of the lower step (45) of outer outer drilling rodClose.
4. telescopic drill rod according to claim 3, is characterized in that, drilling rod except outermost layer,The structure of every grade of outer drilling rod of flexible outer drilling rod is identical, described except drilling rod in innermost layer, flexible interior drilling rodIn every grade, the structure of drilling rod is identical.
5. telescopic drill rod according to claim 3, is characterized in that, the outer brill of described innermost layerLower step (45) is not formed at the inwall bottom of bar; The not shape of outer wall bottom of described outermost interior drilling rodBecome lower step (24).
6. band is just like a mixing pile machine for the telescopic drill rod described in claim 1-5 any one, its spyLevy and be, the mounting platform (8) that comprises a frame (30), moves up and down along stake frame (30),Motor (9) and slew gear are installed on mounting platform (8), and described slew gear comprises and levelKey (10) and trunnion axis (11) that the motor shaft arranging connects, trunnion axis (11) drives a crossed axis angleBe a pair of bevel gear pair of 90 degree, for delivery of the end of the power transmission shaft (13) of slurries, clutch feedingPortion is through the mesopore of passive bevel gear (16), and the top of power transmission shaft (13) is provided with built-in integral typeWater swivel (40), in interior one deck, drilling rod (18) is fixed on the bottom of power transmission shaft (13), outer drilling rodTerminal pad (17) is fixed on the below of passive bevel gear (16), and the outer drilling rod (7) of outermost one deck is solidFix on outer drilling rod terminal pad (17) upper, it is upper that drill bit (1) is fixed on bottom terminal pad (2), in transmissionThe outside cover of axle (13) has the clutch (14) of control power transmission shaft (13).
7. the mixing pile machine with telescopic drill rod according to claim 6, is characterized in that, instituteStating clutch (14) is mechanical clutch or electromagnetic clutch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511021903.9A CN105604494B (en) | 2015-12-23 | 2015-12-23 | A kind of telescopic drill rod and the mixing pile machine with telescopic drill rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511021903.9A CN105604494B (en) | 2015-12-23 | 2015-12-23 | A kind of telescopic drill rod and the mixing pile machine with telescopic drill rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105604494A true CN105604494A (en) | 2016-05-25 |
| CN105604494B CN105604494B (en) | 2018-06-29 |
Family
ID=55984780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511021903.9A Expired - Fee Related CN105604494B (en) | 2015-12-23 | 2015-12-23 | A kind of telescopic drill rod and the mixing pile machine with telescopic drill rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105604494B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108843243B (en) * | 2018-08-17 | 2023-11-21 | 吉林大学 | Hydraulic electric control telescopic hydraulic mining drilling tool suitable for hydraulic mining of drilling |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3517760A (en) * | 1968-03-22 | 1970-06-30 | Delmag Maschinenfabrik | Telescopic drill rods for soil drilling equipments |
| CN2182197Y (en) * | 1993-09-11 | 1994-11-09 | 武汉东湖新能源机器研究所 | Elastic augar stem pile dusting machine |
| CN2375755Y (en) * | 1999-05-25 | 2000-04-26 | 孙新河 | Telescopic drilling rod for delivering slurry |
| CN201214989Y (en) * | 2008-07-04 | 2009-04-01 | 福田雷沃国际重工股份有限公司 | Anti-releasing device for expansion link |
| CN201546615U (en) * | 2009-11-24 | 2010-08-11 | 彭文 | Telescopic drilling tool of mixing pile machine |
| CN203939441U (en) * | 2014-01-06 | 2014-11-12 | 上海上探工程机械有限公司 | Telescopic drill rod |
| CN205225089U (en) * | 2015-12-23 | 2016-05-11 | 徐玉杰 | Telescopic drill rod and stirring stake machine that has telescopic drill rod |
-
2015
- 2015-12-23 CN CN201511021903.9A patent/CN105604494B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3517760A (en) * | 1968-03-22 | 1970-06-30 | Delmag Maschinenfabrik | Telescopic drill rods for soil drilling equipments |
| CN2182197Y (en) * | 1993-09-11 | 1994-11-09 | 武汉东湖新能源机器研究所 | Elastic augar stem pile dusting machine |
| CN2375755Y (en) * | 1999-05-25 | 2000-04-26 | 孙新河 | Telescopic drilling rod for delivering slurry |
| CN201214989Y (en) * | 2008-07-04 | 2009-04-01 | 福田雷沃国际重工股份有限公司 | Anti-releasing device for expansion link |
| CN201546615U (en) * | 2009-11-24 | 2010-08-11 | 彭文 | Telescopic drilling tool of mixing pile machine |
| CN203939441U (en) * | 2014-01-06 | 2014-11-12 | 上海上探工程机械有限公司 | Telescopic drill rod |
| CN205225089U (en) * | 2015-12-23 | 2016-05-11 | 徐玉杰 | Telescopic drill rod and stirring stake machine that has telescopic drill rod |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108843243B (en) * | 2018-08-17 | 2023-11-21 | 吉林大学 | Hydraulic electric control telescopic hydraulic mining drilling tool suitable for hydraulic mining of drilling |
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| Publication number | Publication date |
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| CN105604494B (en) | 2018-06-29 |
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Granted publication date: 20180629 Termination date: 20191223 |