CN105201410A - Combined rotary excavation drilling tool - Google Patents

Combined rotary excavation drilling tool Download PDF

Info

Publication number
CN105201410A
CN105201410A CN201510661791.7A CN201510661791A CN105201410A CN 105201410 A CN105201410 A CN 105201410A CN 201510661791 A CN201510661791 A CN 201510661791A CN 105201410 A CN105201410 A CN 105201410A
Authority
CN
China
Prior art keywords
drilling tool
holder
hydraulic jack
hole
pin
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
Application number
CN201510661791.7A
Other languages
Chinese (zh)
Inventor
徐信芯
焦生杰
熊玉龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Changan University
Original Assignee
Changan University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Changan University filed Critical Changan University
Priority to CN201510661791.7A priority Critical patent/CN105201410A/en
Publication of CN105201410A publication Critical patent/CN105201410A/en
Pending legal-status Critical Current

Links

Abstract

The invention discloses a combined rotary excavation drilling tool. The combined rotary excavation drilling tool comprises a connecting square head, an outer drilling tool body, an inner drilling tool body and a hydraulic oil cylinder, the top of the outer drilling tool body and the top of the hydraulic oil cylinder are connected with the connecting square head, and the hydraulic oil cylinder and the inner drilling tool body are located in the outer drilling tool body; the upper end of the inner drilling tool body is connected with the hydraulic oil cylinder, the lower end of the inner drilling tool body is provided with a center drilling tooth, a spiral blade is arranged on the side face of the inner drilling tool body, a gap is formed between the spiral blade and the inner wall of the outer drilling tool body, and inner drilling teeth are arranged at the bottom of the spiral blade; a drain hole is formed in the side wall of the outer drilling tool body, and multiple outer drilling teeth are arranged on the end face of the bottom of the outer drilling tool body. The combined rotary excavation drilling tool has the advantages of being good in residue discharging effect and large in capacity.

Description

A kind of combined type rotary drill tools
Technical field
The invention belongs to engineering machinery field, relate to a kind of drilling tool, be specifically related to a kind of combined type rotary drill tools.
Background technology
Along with China's rapid development of economy, infrastructure scope is constantly being widened, and rotary drilling rig, because its efficiency is high, pollute less, flexible, function combination is many, has been widely used in infrastructure.In recent years, because the construction ratio of rotary drilling rig in Foundation Design increases gradually, the efficiency of rotary drilling rig in the construction of various stratum is more and more obvious.
In the construction of Foundation Design, main at present exist two class rotary drill tools, and a class is that cylinder bores, its capacity is large, and take native ability strong, efficiency is high, but under getting rid of geotechnological condition at a high speed, often because its drilling pipe stack shell is elongated, there is slag dumping difficult problem, especially when creeping into cohesiveness stratum and the strong stratum of cementing properties, clay can be bonded in inside barrel, very difficult when making drilling pipe slag dumping, the slag dumping time is long, causes efficiency of construction greatly to reduce; Another kind of is spiral drill, and spiral drill is widely used in the construction of hardpan, compares cylinder and bores, spiral drill slag dumping is convenient, because its good guidance quality, hole quality is better than cylinder and bores, but the capacity of spiral drill is little, takes native ability and bore not as good as cylinder, so operating efficiency is lower.
Due to one of critical component that drilling tool is rotary drilling rig, drilling tool directly has influence on the operating efficiency of complete machine, therefore, how to improve the drilling tool structure of rotary drilling rig, improves its operating efficiency, is the current technical issues that need to address.
Summary of the invention
The object of the invention is to the shortcoming overcoming above-mentioned prior art, provide a kind of combined type rotary drill tools, this drilling tool has effective, the capacious advantage of slag dumping.
For achieving the above object, combined type rotary drill tools of the present invention comprises and connects square toes, outer drilling tool, interior drilling tool and hydraulic jack;
The top of outer drilling tool and the top of hydraulic jack all be connected square toes and be connected, hydraulic jack and interior drilling tool are all positioned at outer drilling tool;
The upper end of interior drilling tool is connected with hydraulic jack, and the lower end of interior drilling tool is provided with centre drill tooth, and the side of interior drilling tool is provided with helical blade, and the inwall of helical blade and outer drilling tool has gap, and the bottom of helical blade is provided with interior brill tooth;
The sidewall of outer drilling tool offers discharge orifice, and the end face bottom outer drilling tool is provided with some outer brill teeth.
The outside of described outer drilling tool is provided with the gauge bar of helical structure.
Connect square toes and comprise connection square toes holder, gripper shoe and some gussets, gripper shoe is fixed on and connects on square toes holder, the two ends up and down of gusset are connected with the top of gripper shoe and outer drilling tool respectively, connect square toes holder to be connected with the top of external equipment and hydraulic jack, the side of gusset is provided with the gusset hole for connecting external suspension hook.
The upper end of hydraulic jack is provided with the first holder, first holder be connected square toes holder and be connected, hydraulic jack is connected with the first hydraulic jack bar, the second hydraulic jack bar and the 3rd hydraulic jack bar that are connected successively up and down, the lower end of the 3rd hydraulic jack bar is provided with the second holder, and the top of interior drilling tool is provided with the 3rd holder be connected with the second holder.
The axis of the axis of outer drilling tool, the axis of interior drilling tool and hydraulic jack point-blank.
The barrel of interior drilling tool is straight tube, and interior drilling tool is single thread drilling tool.
Connect square toes holder and be provided with the first pin-and-hole and the second pin-and-hole for connecting external device;
First holder is provided with the 3rd pin-and-hole, the first bearing pin through the first pin-and-hole and the 3rd pin-and-hole by the first holder be connected square toes holder and be connected;
Second holder is provided with the 4th pin-and-hole, and the 3rd holder is provided with the 5th pin-and-hole, and the second holder is connected with the 3rd holder through the 4th pin-and-hole and the 5th pin-and-hole by the second bearing pin.
The upper end of the 3rd holder is provided with groove, and the second holder is embedded in described groove.
The quantity of gusset is 4 pieces;
The quantity of outer brill tooth is 12.
Hydraulic jack is telescopic ram.
The present invention has following beneficial effect:
Combined type rotary drill tools of the present invention bores and the advantage of spiral drill in conjunction with cylinder, hydraulic jack is provided with outside in drilling tool, interior drilling tool and centre drill tooth, when operating, native slag digs in helical blade by interior drilling tool, then dregs is deposited in the top of outer drilling tool, owing to having gap between helical blade and the inwall of outer drilling tool, thus avoid dregs to bond on the inwall of outer drilling tool, during slag dumping, dregs falls under gravity, reach the object of slag dumping, slag dumping effect is better, volume is larger, effectively solve cylinder and bore slag dumping difficult problem, substantially increase efficiency of construction.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation connecting square toes 1 in the present invention;
Fig. 3 is the structural representation of interior drilling tool 3 in the present invention;
Fig. 4 is the location diagram of the second holder 46 and the 3rd holder 31 in the present invention;
Fig. 5 is the structural representation of the present invention China and foreign countries drilling tool 2;
Fig. 6 is the distribution map that tooth 22 bores in the present invention China and foreign countries;
Fig. 7 is upward view of the present invention.
Wherein, 1 be connection side, 2 be outer drilling tool, 3 be interior drilling tool, 4 be hydraulic jack, 11 be gripper shoe for connecting square toes holder, 12,13 be gusset hole, 14 be gauge article for gusset, 15 is the first pin-and-hole, 21,22 be outer brill tooth, 23 be the second holder for discharge orifice, 31 is the 3rd holder, 32 for boring tooth, 34 centered by interior brill tooth, 33 for helical blade, 35 be the 5th pin-and-hole, 41 be the 3rd pin-and-hole, 42 be the first holder, 43 be the first hydraulic jack bar, 44 be the second hydraulic jack bar, 45 is the 3rd hydraulic jack bar, 46.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail:
With reference to figure 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 and Fig. 7, combined type rotary drill tools of the present invention comprise connect square toes 1, outer drilling tool 2, interior drilling tool 3 and hydraulic jack 4; The top of outer drilling tool 2 and the top of hydraulic jack 4 all be connected square toes 1 and be connected, hydraulic jack 4 and interior drilling tool 3 are all positioned at outer drilling tool 2; The upper end of interior drilling tool 3 is connected with hydraulic jack 4, and the lower end of interior drilling tool 3 is provided with centre drill tooth 33, and the side of interior drilling tool 3 is provided with helical blade 34, and helical blade 34 has gap with the inwall of outer drilling tool 2, and the bottom of helical blade 34 is provided with interior brill tooth 32; The sidewall of outer drilling tool 2 offers discharge orifice 23, and the end face bottom outer drilling tool 2 is provided with some outer brill teeth 22; The outside of outer drilling tool 2 is provided with the gauge bar 21 of helical structure, and point-blank, the barrel of interior drilling tool 3 is straight tube to the axis of the outer axis of drilling tool 2, the axis of interior drilling tool 3 and hydraulic jack 4, and interior drilling tool 3 is single thread drilling tool.
It should be noted that, connect square toes 1 and comprise connection square toes holder 11, gripper shoe 12 and some gussets 14, gripper shoe 12 is fixed on and connects on square toes holder 11, the two ends up and down of gusset 14 are connected with the top of gripper shoe 12 and outer drilling tool 2 respectively, connect square toes holder 11 to be connected with the top of external equipment and hydraulic jack 4, the side of gusset 14 is provided with the gusset hole 13 for connecting external suspension hook.The upper end of hydraulic jack 4 is provided with the first holder 42, first holder 42 be connected square toes holder 11 and be connected, hydraulic jack 4 is connected with the first hydraulic jack bar 43, the second hydraulic jack bar 44 and the 3rd hydraulic jack bar 45 that are connected successively up and down, the lower end of the 3rd hydraulic jack bar 45 is provided with the second holder 46, and the top of interior drilling tool 3 is provided with the 3rd holder 31 be connected with the second holder 46.
Concrete, connect square toes holder 11 and be provided with the first pin-and-hole 15 and the second pin-and-hole for connecting external device; First holder 42 be provided with the 3rd pin-and-hole 41, first bearing pin through the first pin-and-hole 15 and the 3rd pin-and-hole 41 by the first holder 42 be connected square toes holder 11 and be connected; Second holder 46 is provided with the 4th pin-and-hole, and the 3rd holder 31 is provided with the 5th pin-and-hole 35, second bearing pin and is connected with the 3rd holder 31 by the second holder 46 through the 4th pin-and-hole and the 5th pin-and-hole 35; The upper end of the 3rd holder 31 is provided with groove, and the second holder 46 is embedded in described groove; The quantity of gusset 14 is 4 pieces; The quantity of outer brill tooth 22 is 12; Hydraulic jack 4 is telescopic ram.
The Main Function of interior drilling tool 3 fetches earth for creeping into, before creeping into, hydraulic jack 4 stretches out, centre drill tooth 33 is connected to the 3rd hydraulic jack bar 45 bottom, be subject to the pressure of hydraulic jack 4, the size of centre drill tooth 33 is greater than the size of interior brill tooth 32, first centre drill tooth 33 touches soil layer, and compress into soil layer, rotate into soil layer, good axial location is formed to interior drilling tool 3, when centre drill tooth 33 enters soil layer appropriate depth, interior brill tooth 32 starts to contact soil layer, interior drilling tool 3 is along with the rotation of hydraulic jack bar, interior brill tooth 32 starts to cut soil layer, soil slag can enter on helical blade 34, along with helical blade 34 is piled up from the bottom up, acting as of helical blade 34 is transported and carries native slag.
Operating principle of the present invention is: during drilling condition, connects square toes 1 and is connected with drilling rod, transmits the moment of torsion from rotary digging drill power head and the pressure of pressurization oil cylinder, rotates and creep into downwards with combined type rotary drill tools of the present invention, concrete step of creeping into is as follows: hydraulic jack 4 drives the 3rd hydraulic jack bar 45 to stretch out, in promoting, drilling tool 3 moves downward, when interior drilling tool 3 exceeds at the bottom of the cylinder of outer drilling tool 2, start to touch soil layer, size due to centre drill tooth 33 is greater than the size of interior brill tooth 32, centre drill tooth 33 is under the pressure effect of pressurize oil cylinder and hydraulic jack 4, driven to rotate to soil layer by unit head and to creep into, after centre drill tooth 33 enters soil layer, owing to connecting each hydraulic jack bar of centre drill tooth 33, interior drilling tool 3 and outer drilling tool 2 coaxial, so centre drill tooth 33 can give interior drilling tool 3 and outer drilling tool 2 well axial location, prevent hole scattering phenomenon, then bore tooth 32 in start to contact soil layer, and rotary cutting soil layer, the native slag be cut can be stored on helical blade 34, along with deeply creeping into of interior drilling tool 3, outer drilling tool 2 starts to touch soil layer, drilling pipe diameter due to outer drilling tool 2 is greater than the diameter of helical blade 34, beyond drilling tool 2 can continue to creep in the outside in the hole that interior drilling tool 3 has bored, the enlarged-diameter in the hole of having bored, and the drilling pipe native slag being collected outer drilling tool 2 is inner, in the process of down creeping into, soil slag can move up along spiral path on the helical blade 34 of interior drilling tool 3, the drilling pipe finally entering into outer drilling tool 2 is inner,
When slag dumping, hydraulic jack 4 drives the 3rd hydraulic jack bar 45 inwardly to shrink, thus drilling tool 3 up moves in driving, until interior drilling tool 3 is retracted in the drilling pipe of outer drilling tool 2 completely, winding of rotary drilling rig system starts to carry on drilling rod, drilling rod drives combined type rotary drill tools of the present invention to move upward, after whole combined type rotary drill tools of the present invention departs from the suitable height of boring, after the slew gear of rotary drilling rig complete machine drives combined type rotary drill tools of the present invention to turn to unload the position of soil, hydraulic jack 4 drives each hydraulic jack bar to stretch out, until interior drilling tool 3 reach completely the drilling pipe of outer drilling tool 2 outer till, unit head starts reversion, high speed centrifugation gets rid of soil, thus realize slag dumping.
The combined type rotary drill tools of the present invention's design easily can unload native reason and be: during drilling condition, on the drilling pipe that dregs is deposited in outer drilling tool 2 and helical blade 34, the inwall of helical blade 34 and outer drilling tool 2 has certain gap, the dregs of outer drilling tool 2 drilling pipe inside leans on the support of helical blade 34, and the position that drilling pipe inside is positioned at helical blade 34 top can be stored in, gap location between helical blade 34 and drilling pipe inwall, owing to lacking support, gap location does not almost have dregs, so clayed soil and drilling pipe inwall lack enough extruding, do not become viscous force, so when getting rid of soil, interior drilling tool 3 is when hydraulic jack 4 is pushed to outer drilling tool 2 outside, the dregs of drilling pipe inside under gravity, automatically land, unit head reversion is anxious to stop, dregs on helical blade 34 is also laid down.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a combined type rotary drill tools, is characterized in that, comprises and connects square toes (1), outer drilling tool (2), interior drilling tool (3) and hydraulic jack (4);
The top of outer drilling tool (2) and the top of hydraulic jack (4) all be connected square toes (1) and be connected, hydraulic jack (4) and interior drilling tool (3) are all positioned at outer drilling tool (2);
The upper end of interior drilling tool (3) is connected with hydraulic jack (4), the lower end of interior drilling tool (3) is provided with centre drill tooth (33), the side of interior drilling tool (3) is provided with helical blade (34), helical blade (34) has gap with the inwall of outer drilling tool (2), and the bottom of helical blade (34) is provided with interior brill tooth (32);
The sidewall of outer drilling tool (2) offers discharge orifice (23), the end face of outer drilling tool (2) bottom is provided with some outer brill teeth (22).
2. combined type rotary drill tools according to claim 1, is characterized in that, the outside of described outer drilling tool (2) is provided with the gauge bar (21) of helical structure.
3. combined type rotary drill tools according to claim 1, it is characterized in that, connect square toes (1) and comprise connection square toes holder (11), gripper shoe (12) and some gussets (14), gripper shoe (12) is fixed on and connects on square toes holder (11), the two ends up and down of gusset (14) are connected with the top of gripper shoe (12) and outer drilling tool (2) respectively, connect square toes holder (11) to be connected with the top of external equipment and hydraulic jack (4), the side of gusset (14) is provided with the gusset hole (13) for connecting external suspension hook.
4. combined type rotary drill tools according to claim 3, it is characterized in that, the upper end of hydraulic jack (4) is provided with the first holder (42), first holder (42) be connected square toes holder (11) and be connected, hydraulic jack (4) is connected with the first hydraulic jack bar (43) be connected successively up and down, second hydraulic jack bar (44) and the 3rd hydraulic jack bar (45), the lower end of the 3rd hydraulic jack bar (45) is provided with the second holder (46), the top of interior drilling tool (3) is provided with the 3rd holder (31) be connected with the second holder (46).
5. combined type rotary drill tools according to claim 1, is characterized in that, the axis of the axis of outer drilling tool (2), interior drilling tool (3) and the axis of hydraulic jack (4) are point-blank.
6. combined type rotary drill tools according to claim 1, is characterized in that, the barrel of interior drilling tool (3) is straight tube, and interior drilling tool (3) is single thread drilling tool.
7. combined type rotary drill tools according to claim 4, is characterized in that,
Connect square toes holder (11) and be provided with the first pin-and-hole (15) and the second pin-and-hole for connecting external device;
First holder (42) is provided with the 3rd pin-and-hole (41), the first bearing pin through the first pin-and-hole (15) and the 3rd pin-and-hole (41) by the first holder (42) be connected square toes holder (11) and be connected;
Second holder (46) is provided with the 4th pin-and-hole, 3rd holder (31) is provided with the 5th pin-and-hole (35), and the second holder (46) is connected with the 3rd holder (31) through the 4th pin-and-hole and the 5th pin-and-hole (35) by the second bearing pin.
8. combined type rotary drill tools according to claim 4, is characterized in that, the upper end of the 3rd holder (31) is provided with groove, and the second holder (46) is embedded in described groove.
9. combined type rotary drill tools according to claim 4, is characterized in that,
The quantity of gusset (14) is 4 pieces;
The quantity of outer brill tooth (22) is 12.
10. combined type rotary drill tools according to claim 1, is characterized in that, hydraulic jack (4) is telescopic ram.
CN201510661791.7A 2015-10-14 2015-10-14 Combined rotary excavation drilling tool Pending CN105201410A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510661791.7A CN105201410A (en) 2015-10-14 2015-10-14 Combined rotary excavation drilling tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510661791.7A CN105201410A (en) 2015-10-14 2015-10-14 Combined rotary excavation drilling tool

Publications (1)

Publication Number Publication Date
CN105201410A true CN105201410A (en) 2015-12-30

Family

ID=54949323

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510661791.7A Pending CN105201410A (en) 2015-10-14 2015-10-14 Combined rotary excavation drilling tool

Country Status (1)

Country Link
CN (1) CN105201410A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110306925A (en) * 2019-08-12 2019-10-08 吴迪 A kind of digging perforation structure of the road construction based on shroud
CN111472691A (en) * 2020-04-20 2020-07-31 牡丹江师范学院 Multifunctional diamond drill bit

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3388949A (en) * 1965-12-22 1968-06-18 Salem Tool Co Mining machine head
US4228862A (en) * 1977-11-15 1980-10-21 Antoine Causse Apparatus for drilling holes in the ground
CN1241666A (en) * 1999-08-02 2000-01-19 叶长生 Auger bin for deposited-pile hole
US20080127528A1 (en) * 2006-11-30 2008-06-05 Mlt Soil Co., Ltd. Earth auger head and excavation method
CN101343982A (en) * 2008-08-22 2009-01-14 北京市三一重机有限公司 Double-layer barrel type drilling tool
CN201598983U (en) * 2009-10-30 2010-10-06 北京市三一重机有限公司 Spiral drilling machine and spiral drilling tool thereof
CN202360033U (en) * 2011-11-29 2012-08-01 北京市三一重机有限公司 Rotary digging drill tool capable of automatically discharging slag
CN205025364U (en) * 2015-10-14 2016-02-10 长安大学 Dig drilling tool soon

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3388949A (en) * 1965-12-22 1968-06-18 Salem Tool Co Mining machine head
US4228862A (en) * 1977-11-15 1980-10-21 Antoine Causse Apparatus for drilling holes in the ground
CN1241666A (en) * 1999-08-02 2000-01-19 叶长生 Auger bin for deposited-pile hole
US20080127528A1 (en) * 2006-11-30 2008-06-05 Mlt Soil Co., Ltd. Earth auger head and excavation method
CN101343982A (en) * 2008-08-22 2009-01-14 北京市三一重机有限公司 Double-layer barrel type drilling tool
CN201598983U (en) * 2009-10-30 2010-10-06 北京市三一重机有限公司 Spiral drilling machine and spiral drilling tool thereof
CN202360033U (en) * 2011-11-29 2012-08-01 北京市三一重机有限公司 Rotary digging drill tool capable of automatically discharging slag
CN205025364U (en) * 2015-10-14 2016-02-10 长安大学 Dig drilling tool soon

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110306925A (en) * 2019-08-12 2019-10-08 吴迪 A kind of digging perforation structure of the road construction based on shroud
CN111472691A (en) * 2020-04-20 2020-07-31 牡丹江师范学院 Multifunctional diamond drill bit

Similar Documents

Publication Publication Date Title
CN104018792B (en) Reducing screw displacement pile drilling tool and construction method thereof
CN2906026Y (en) Double-barrel hard rock core drill for large-diameter pile hole
CN204082014U (en) A kind of combined type PDC drill bit
CN205025364U (en) Dig drilling tool soon
CN203594367U (en) Spiral half soil squeezing and dumping drilling tool
CN105201410A (en) Combined rotary excavation drilling tool
CN206503562U (en) A kind of impact rotating extrusion sealing drill bit
CN203701981U (en) Reamer bit
CN103510850B (en) A kind of piling drilling rig
CN203569561U (en) Novel pile forming device of steel pipe protection wall cast-in-place piles following up drill
CN203188899U (en) Full sleeve special-type drilling machine
CN105568962B (en) A kind of new self-advancing type multiple holes grouting stake and its grouting construction method
CN204492646U (en) Bore broken integrated sluicing internal discharging type tunnel drilling tool
CN210918893U (en) Drill bit for rapidly repairing wall of pile hole
CN106049463B (en) The construction method and its drilling tool of a kind of earth-squeezing hole-enlarging stake and the earth-squeezing hole-enlarging stake
CN204252833U (en) A kind of long spire center pressure of improvement fills with CFG stake drill bit
CN204225782U (en) A kind of large aperture, coal seam deep drill Anti-inclining drilling rod
CN204572026U (en) A kind of Multifunctional anchor rod device
CN202055750U (en) Screw-type compact drilling device
CN203175394U (en) Engineering drilling machine capable of carrying out ultra-flow state concrete pressing-and-filling pile construction on hard rock stratum
CN110295849A (en) Weathering crushed zone bored grouting method and drilling sub-assembly in shallow rock
CN206267795U (en) Spiral cylinder soil compaction drill bit
CN206338032U (en) A kind of long auger guncreting pile expansion bit
CN206608110U (en) A kind of adjustable drill bit device of diameter for bored pile construction
CN108222837A (en) Rotary excavating extruding expanding drilling head, the rotary drilling rig and construction method for including it

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20151230

RJ01 Rejection of invention patent application after publication