CN105604494B - A kind of telescopic drill rod and the mixing pile machine with telescopic drill rod - Google Patents
A kind of telescopic drill rod and the mixing pile machine with telescopic drill rod Download PDFInfo
- Publication number
- CN105604494B CN105604494B CN201511021903.9A CN201511021903A CN105604494B CN 105604494 B CN105604494 B CN 105604494B CN 201511021903 A CN201511021903 A CN 201511021903A CN 105604494 B CN105604494 B CN 105604494B
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- Prior art keywords
- drilling rod
- layer
- interior
- rod
- wall
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- 238000005553 drilling Methods 0.000 claims abstract description 175
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 239000002002 slurry Substances 0.000 claims abstract description 7
- 230000007246 mechanism Effects 0.000 claims description 14
- 230000009182 swimming Effects 0.000 claims description 2
- 241001074085 Scophthalmus aquosus Species 0.000 claims 2
- 238000010276 construction Methods 0.000 abstract description 12
- 238000003912 environmental pollution Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Paleontology (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of telescopic drill rod and the mixing pile machine with telescopic drill rod, outer drilling rod is that multistage card slot type stretches outer drilling rod, interior drilling rod is the flexible interior drilling rod of multistage screw-nut or multi-stage hydraulic expansion cylinder, stretches outer drilling rod together with flexible interior drilling rod from level to level ring set；It is connected on external connection power at the top of outermost one layer outer drilling rod of the outer drilling rod that stretches, in flexible drilling rod most in transmission shaft for conveying slurries, clutch feeding is fixed in one layer at the top of drilling rod, stretch outer drilling rod most in one layer of outer drilling rod bottom with it is flexible in outermost one layer of drilling rod drilling rod bottom be fixed in same bottom terminal pad, make stretch outer drilling rod and interior drilling rod linkage of stretching.The present invention can be stirred pile driving construction under limited space operating mode, for example, construction, the interior construction of existing railway line side dressing work, workshop etc. under the high-voltage line of field.It is at low cost, free from environmental pollution compared with existing construction is using high-pressure rotary jet grouting pile, it solves the problems, such as using high-pressure rotary jet grouting pile track deformation caused by existing railway line side dressing working hour.
Description
Technical field
The present invention relates to a kind of mixing pile machine, especially a kind of telescopic drill rod and the mixing pile machine with telescopic drill rod.
Background technology
Railway, highway, building, municipal administration, water conservancy, port engineering mixing pile construction in, it will usually encounter limited space
Operating mode, for example, construct in the construction of field high-voltage line, existing railway line side dressing work, workshop etc..General mixing pile machine height cannot
Meet construction needs, so existing construction generally use high-pressure rotary jet grouting pile solves, drawback is of high cost, pollution environment and easily
Cause existing railway track deformation, influence existing railway normal operation.
Invention content
The technical problem to be solved by the invention is to provide a kind of telescopic drill rod and the mixing pile machine with telescopic drill rod,
Simple in structure, scalable drilling is suitble to narrow space construction.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：A kind of telescopic drill rod, including outer drilling rod and
Interior drilling rod, outer drilling rod are that multistage card slot type stretches outer drilling rod, and interior drilling rod is multistage screw-nut or multi-stage hydraulic expansion cylinder
Drilling rod in flexible stretches outer drilling rod together with flexible interior drilling rod from level to level ring set；Outermost one layer of the outer drilling rod that stretches is outer
Be connected on external connection power at the top of drilling rod, it is flexible in drilling rod most in be fixed at the top of drilling rod in one layer for convey slurries, from
On the transmission shaft for closing feeding, the outer drilling rod that stretches most in one layer of outer drilling rod bottom with outermost one layer of the interior drilling rod that stretches in drilling rod bottom
Portion is fixed in same bottom terminal pad, makes stretch outer drilling rod and flexible interior drilling rod linkage.
It is described it is flexible in drilling rod be round bur bar, the outer wall of drilling rod is axially provided with externally threaded undergauge in every grade
Section, the top of undergauge section, bottom form upper step and lower step with the outer wall of interior drilling rod respectively, are bored in except one layer in most
The upper inside wall of other interior drilling rods at different levels of bar is formed with a female interior step of circle surface band, the internal thread of interior step with
The external screw thread cooperation of the undergauge section of drilling rod in internal layer, in outer layer in the inner wall and internal layer of drilling rod the lower step of drilling rod outer surface
Cooperation.
The outer drilling rod that stretches is kelly bar or round bur bar, and the inner wall of every grade of outer drilling rod is axially provided with extension diameter section,
Outer drilling rod upper step and outer drilling rod lower step are formed respectively with the inner wall of outer drilling rod on top, the bottom of extension diameter section, except most
The outer wall top of other outer drilling rods at different levels of outer one layer of outer drilling rod is formed with a circle outer step, the outer diameter and outer layer of outer step
The internal diameter size cooperation of outer drilling rod extension diameter section, the outer wall and the inner wall of the lower step of the outer drilling rod of outer layer of the outer drilling rod of internal layer coordinate.
The drilling rod in addition to outermost layer, the structure of every grade of outer drilling rod of the outer drilling rod that stretches is identical, described except drilling rod in innermost layer, stretches
The structure of drilling rod is identical in every grade of drilling rod in contracting.
The inner wall lower of the outer drilling rod of the innermost layer does not form lower step；Under the outer wall of the outermost interior drilling rod
Portion does not form lower step.
Mixing pile machine with above-mentioned telescopic drill rod, which is characterized in that moved up and down including stake rack, along stake rack
Mounting platform, motor and swing mechanism be installed on mounting platform, the swing mechanism includes and horizontally disposed motor
The key and trunnion axis of axis connection, trunnion axis drives a pair of of bevel gear pair that a crossed axis angle is 90 degree, for conveying slurries, clutch
The bottom of the transmission shaft of feeding passes through the mesoporous of passive bevel gear, and built-in one body swimming connector is equipped at the top of transmission shaft,
Drilling rod is fixed on the bottom of transmission shaft in one layer most interior, and outer drilling rod terminal pad is fixed on the lower section of passive bevel gear, and outermost one
The outer drilling rod of layer is fixed in outer drilling rod terminal pad, and drill bit is fixed in the terminal pad of bottom, and control is cased on the outside of transmission shaft and is passed
The clutch of moving axis.
The clutch is mechanical clutch or electromagnetic clutch.
The beneficial effects of the invention are as follows：Pile driving construction can be stirred under limited space operating mode, for example, field high-voltage line
Construct in lower construction, existing railway line side dressing work, workshop etc..It is at low cost, no compared with existing construction is using high-pressure rotary jet grouting pile
Environment is polluted, is solved using high-pressure rotary jet grouting pile existing trajectory problem on deformation caused by existing railway line side dressing working hour.
Description of the drawings
Fig. 1 is the overall structure schematic diagram when mixing pile machine with telescoping mechanism of the present invention stretches 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 structure diagram when telescopic drill rod of the present invention stretches out.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description：
As shown in Figure 1,2,3, 4, telescopic drill rod of the invention, including outer drilling rod and interior drilling rod, outer drilling rod is multistage card slot
Formula is stretched outer drilling rod, interior drilling rod be multistage screw-nut or multi-stage hydraulic expansion cylinder it is flexible in drilling rod, stretch outer drilling rod and
Ring set is together from level to level for drilling rod in flexible；External connection power is connected at the top of outermost one layer outer drilling rod of the outer drilling rod that stretches
On, it is flexible in drilling rod most in transmission shaft for conveying slurries, clutch feeding is fixed in one layer at the top of drilling rod, stretch outer
Drilling rod most in one layer of outer drilling rod bottom with it is flexible in outermost one layer of drilling rod drilling rod bottom be fixed on same bottom terminal pad
On, make stretch outer drilling rod and flexible interior drilling rod linkage.
It is described it is flexible in drilling rod be round bur bar, the outer wall of drilling rod is axially provided with externally threaded undergauge section in every grade
50, the top of undergauge section, bottom form upper step 34 and lower step 24 with the outer wall of interior drilling rod respectively, except one layer in most
The upper inside wall of other interior drilling rods at different levels of interior drilling rod is formed with the female interior step 33 of a circle surface band, interior step 33
The external screw thread of the undergauge section 50 of drilling rod coordinates in internal thread and internal layer, in outer layer in the inner wall and internal layer of drilling rod drilling rod lower stage
The outer surface cooperation of rank 24.
The outer drilling rod that stretches is kelly bar or round bur bar, and the inner wall of every grade of outer drilling rod is axially provided with extension diameter section
60, outer drilling rod upper step 44 and outer drilling rod lower step 45 are formed respectively with the inner wall of outer drilling rod on top, the bottom of extension diameter section,
Except the outer wall top of other outer drilling rods at different levels of outermost one layer of outer drilling rod is formed with a circle outer step 46, the outer diameter of outer step 46
Size and the internal diameter size of the outer drilling rod extension diameter section 60 of outer layer coordinate, the lower step of the outer wall and the outer drilling rod of outer layer of the outer drilling rod of internal layer
45 inner wall cooperation.
The drilling rod in addition to outermost layer, the structure of every grade of outer drilling rod of the outer drilling rod that stretches is identical, described except drilling rod in innermost layer, stretches
The structure of drilling rod is identical in every grade of drilling rod in contracting.The inner wall lower of the outer drilling rod of the innermost layer does not form lower step 45；
Lower step 24 is not formed at the outer wall lower part of the outermost interior drilling rod.
Mixing pile machine with above-mentioned telescopic drill rod, including stake rack 30, the installation moved up and down along stake rack 30
Platform 8, is equipped with motor 9 and swing mechanism on mounting platform 8, and the swing mechanism includes connecting with horizontally disposed motor shaft
The key 10 and trunnion axis 11 connect, it is 90 degree of a pair of of bevel gear pair that trunnion axis 11, which drives a crossed axis angle, for convey slurries, from
The bottom for closing the transmission shaft 13 of feeding passes through the mesoporous of passive bevel gear 16, and the top of transmission shaft 13 is equipped with built-in integral type
Water swivel 40, it is one layer most interior in drilling rod 18 be fixed on the bottom of transmission shaft 13, outer drilling rod terminal pad 17 is fixed on passive umbrella shape tooth
The lower section of wheel 16, outermost one layer of outer drilling rod 7 are fixed in outer drilling rod terminal pad 17, and drill bit 1 is fixed in bottom terminal pad 2,
The outside of transmission shaft 13 is cased with the clutch 14 of control transmission shaft 13.
The clutch 14 is mechanical clutch or electromagnetic clutch.
It is illustrated by taking one group 5 layers 4 flexible telescopic drill rods as an example below：
Equipped with motor 9 and swing mechanism on the platform 8 moved up and down along stake rack 30, swing mechanism includes key 10, horizontal
Axis 11, active bevel gear 12, passive bevel gear 16, outer drilling rod terminal pad 17, the top of transmission shaft 13 are equipped with built-in one
Body formula water swivel 40, transmission shaft 13 are equipped with clutch 14, and the present embodiment is mechanical clutch, including taper sheath and the axis of cone, revolution
Equipped with telescopic drill rod below mechanism, including the outer drilling rod 3,4,5,6,7 that stretches, stretch interior drilling rod 18,19,20,21,22, stretches outer
Drilling rod this example is kelly bar, and interior drilling rod is round bur bar.Interior, outer drilling rod is connected by the weldering of bottom terminal pad 2, and drill bit 1 passes through
It is bolted to the lower section of terminal pad 2.
The operation principle of the structure is as follows：The motor shaft of motor 9 drives trunnion axis 11 to revolve by key 10 on platform 8
Turn, trunnion axis 11 drives active bevel gear 12 to rotate, and active bevel gear 12 drives passive bevel gear 16 to rotate, passive umbrella
Shape gear 16 drives outer drilling rod terminal pad 17 to rotate, and outer drilling rod terminal pad 17 drives 6,6 band of outermost layer 7,7 band of kelly bar, 5,5 band
4,4 bands 3 rotate.3 by terminal pad 2 drive outermost layer in drilling rod 22 rotate, 22,21,20,19,18 be respectively by undergauge section 50,
The internal and external screw thread fastness formed with female interior step 33.It is theoretical since 22,21,20,19,18 diameters successively decrease successively
On be that the fastness 19 of diameter minimum rotates, drive 20,21,22 to move down downwards, the interior step 33 on the top on 19
During the upper plane contact of lower plane and 20 lower step, very big frictional force is generated, when frictional force is more than the second level 19 and 20
When screw thread pays frictional force, second level screw thread can be made to pay rotation, 20 rotations is promoted to stretch out.And the frictional force of contact surface is easy to greatly
The frictional force that screw thread is paid is crossed, and so on, until the rotation of drilling rod 22 is stretched out in outermost layer, after stretching out in place, motor reversal bounces back
Principle of Process is identical with stretching, and screw starts to step up contraction completion one cycle, according to the technological requirement of stake, completes flexible
Number, pile.Stake machine is displaced to next position.
Outer drilling rod principle of stretching is：When interior drilling rod is rotated down stretching, theoretically due to gravity and the arm of force, drive
Outer drilling rod 6 stretches out, when the lower plane of the outer step 46 on outer 6 top of drilling rod drops to the lower part with the fixed outer drilling rod 7 of outermost layer
It on step 45 during plane, blocks, stops stretching out, the outer drilling rod 5 of next layer continues to stretch out, and similarly analogizes, until drilling rod 3 outside innermost layer
Rotation is stretched out.
Clutch 14 is cone clutch in the present embodiment, is conjunction state during feeding, ensures that line shaft 13 does not turn, so as to solid
Drilling rod 18 does not rotate in fixed, when feeding encounters hard formation or rock, is opened clutch with lever 15, make drilling rod stop strength into
It gives, ensures that parts are not destroyed.It is risen after using pulley 31 and equipment self-weight, the column of platform 8 along stake rack 30 is slided.
In above-described embodiment, swing mechanism is bevel gear mechanism, and spur gear, worm gear and other mechanisms can also.Using this
The mixing pile machine of invention, the method that simple extension arm can also be used, but poor practicability is once.
In conclusion present disclosure is not limited in the above embodiments, the knowledgeable people in same area can
Can propose other embodiments easily, but this embodiment is included in this hair within the technological guidance's thought of the present invention
Within the scope of bright.
Claims (4)
1. a kind of telescopic drill rod, including outer drilling rod and interior drilling rod, which is characterized in that outer drilling rod is that multistage card slot type stretches outer brill
Bar, interior drilling rod are the interior drilling rod that stretches of multistage screw-nut or multi-stage hydraulic expansion cylinder, and stretch outer drilling rod and flexible interior drilling rod
Ring set is together from level to level；It is connected on external connection power at the top of outermost one layer outer drilling rod of the outer drilling rod that stretches, interior bore of stretching
Bar most in be fixed to transmission shaft for conveying slurries, clutch feeding in one layer at the top of drilling rod, the outer drilling rod that stretches most in
One layer of outer drilling rod bottom with it is flexible in outermost one layer of drilling rod drilling rod bottom be fixed in same bottom terminal pad, make flexible outer
Drilling rod links with flexible interior drilling rod；It is described it is flexible in drilling rod be round bur bar, the outer wall of drilling rod is axially provided in every grade
Externally threaded undergauge section (50), top, the bottom of undergauge section form upper step (34) and lower part with the outer wall of interior drilling rod respectively
Step (24), the upper inside wall of other interior drilling rods at different levels of drilling rod is formed with a circle surface with internal thread in except one layer in most
Interior step (33), the external screw thread cooperation of the undergauge section (50) of drilling rod in the internal thread and internal layer of interior step (33) bored in outer layer
The outer surface cooperation of the lower step (24) of drilling rod in the inner wall and internal layer of bar；The outer drilling rod that stretches is kelly bar or round bur
Bar, the inner wall of every grade of outer drilling rod are axially provided with extension diameter section (60), the top of extension diameter section, bottom respectively in outer drilling rod
Wall forms outer drilling rod upper step (44) and outer drilling rod lower step (45), except other outer brills at different levels of outermost one layer of outer drilling rod
The outer wall top of bar is formed with a circle outer step (46), outer diameter and the outer drilling rod extension diameter section (60) of outer layer of outer step (46)
Internal diameter size coordinates, and the outer wall and the inner wall of the lower step (45) of the outer drilling rod of outer layer of the outer drilling rod of internal layer coordinate；Outside innermost layer
The inner wall lower of drilling rod does not form lower step (45)；Lower step (24) is not formed at the outer wall lower part of outermost interior drilling rod.
2. telescopic drill rod according to claim 1, which is characterized in that the drilling rod in addition to outermost layer, every grade of the outer drilling rod that stretches
The structure of outer drilling rod is identical, and except drilling rod in innermost layer, the structure of drilling rod is identical in every grade of interior drilling rod that stretches.
3. a kind of band is just like the mixing pile machine of claim 1-2 any one of them telescopic drill rods, which is characterized in that including stake machine
Frame (30), the mounting platform (8) moved up and down along stake rack (30) are equipped with motor (9) and revolution on mounting platform (8)
Mechanism, the swing mechanism include and the key (10) of horizontally disposed motor axis connection and trunnion axis (11), trunnion axis (11) band
A pair of of bevel gear pair that a dynamic crossed axis angle is 90 degree, the bottom for conveying the transmission shaft (13) of slurries, clutch feeding pass through
The mesoporous of passive bevel gear (16), is equipped with built-in one body swimming connector (40) at the top of transmission shaft (13), it is one layer most interior in
Drilling rod (18) is fixed on the bottom of transmission shaft (13), and outer drilling rod terminal pad (17) is fixed on the lower section of passive bevel gear (16),
Outermost one layer of outer drilling rod (7) is fixed on outer drilling rod terminal pad (17), and drill bit (1) is fixed in bottom terminal pad (2), is being driven
The clutch (14) of control transmission shaft (13) is cased on the outside of axis (13).
4. the mixing pile machine according to claim 3 with telescopic drill rod, which is characterized in that the clutch (14) is machine
Tool 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 CN105604494A (en) | 2016-05-25 |
| CN105604494B true 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) |
Families Citing this family (2)
| 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 |
| CN115434631B (en) * | 2022-09-29 | 2024-07-23 | 北京中岩大地科技股份有限公司 | Deep stirring drilling tool with active telescopic function and use method |
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 |
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| Publication number | Publication date |
|---|---|
| CN105604494A (en) | 2016-05-25 |
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