CN109555485A - A kind of geotechnical engineering investigation drilling equipment - Google Patents
A kind of geotechnical engineering investigation drilling equipment Download PDFInfo
- Publication number
- CN109555485A CN109555485A CN201910047199.6A CN201910047199A CN109555485A CN 109555485 A CN109555485 A CN 109555485A CN 201910047199 A CN201910047199 A CN 201910047199A CN 109555485 A CN109555485 A CN 109555485A
- Authority
- CN
- China
- Prior art keywords
- drilling rod
- sleeve
- geotechnical engineering
- block
- drilling
- 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
- 238000005553 drilling Methods 0.000 title claims abstract description 60
- 238000011835 investigation Methods 0.000 title claims abstract description 16
- 230000000694 effects Effects 0.000 claims abstract description 15
- 244000309464 bull Species 0.000 claims abstract description 4
- 210000003781 tooth socket Anatomy 0.000 claims description 8
- 230000001681 protective effect Effects 0.000 claims description 7
- 125000006850 spacer group Chemical group 0.000 claims description 4
- 238000003491 array Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 238000010009 beating Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 3
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000003381 stabilizer 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
- E21B11/00—Other drilling tools
- E21B11/005—Hand operated drilling tools
-
- 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
- E21B15/00—Supports for the drilling machine, e.g. derricks or masts
- E21B15/006—Means for anchoring the drilling machine to the ground
-
- 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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/24—Guiding or centralising devices for drilling rods or pipes
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of geotechnical engineering investigation drilling equipments of drilling rig technical field, including link block, the intermediate active of the link block is plugged with drilling rod, the bottom activity of the supporting sleeve inner cavity is plugged with support inserted link, the supporting sleeve is provided with the clamp device to match with support inserted link far from the bottom of drilling rod side, the bottom of the support inserted link is provided with transfer, the bottom of the transfer is provided with leg device, the bottom movable sleeve of the bull stick is connected to guiding device, the device passes through rotation steering block, make chassis and ground keeping parallelism, increase the contact area with ground, keep the device more stable, rotation steering block keeps contact pin vertical with ground holding, and contact pin is injected into ground, it can play the role of effective anti-skidding, beating for three groups of support inserted links is fixed with matching for guide sleeve by connecting rod Angle of release degree, in drilling rod rotation, the bottom of fixed drilling rod, and drilling rod bottom is avoided to shake.
Description
Technical field
The present invention relates to ground probing technical field more particularly to a kind of geotechnical engineering investigation drilling equipments.
Background technique
Probing is indispensable a part in geotechnical engineering investigation, but existing drilling rig structure is simple, function
Can be single, geotechnical engineering investigation often carries out probing work in field, and field geology condition is poor, and in drilling, stabilizer blade is unstable
It is fixed, it is easy to produce offset, so as to cause drilling sideslip, influences drilling quality.
Summary of the invention
The purpose of the present invention is to provide a kind of geotechnical engineering investigation drilling equipment and methods, to solve above-mentioned background technique
The problem of middle proposition.
To achieve the above object, the invention provides the following technical scheme: a kind of geotechnical engineering investigation drilling equipment, including even
Block is connect, the intermediate active of the link block is plugged with drilling rod, and the top at left and right sides of the drilling rod is provided with handle, the brill
The bottom of bar is movably set with drill bit, and the outside of the link block bottom is uniformly hinged with supporting sleeve, in the supporting sleeve
The bottom activity of chamber is plugged with support inserted link, and the supporting sleeve is provided with and support inserted link phase far from the bottom of drilling rod side
The bottom of the clamp device matched, the support inserted link is provided with transfer, and the transfer includes steering block, the steering
Steering slot is offered at the top of block, and the inner cavity for turning to slot is movably set with steering ball, the top of the steering ball and support are inserted
The bottom of foot connects, and the bottom of the transfer is provided with leg device, and the leg device includes contact pin, and the top of contact pin
Portion and the bottom of steering block connect, and are evenly arranged with baffle on the outside of the contact pin, the outside movable sleeve of the contact pin is connected to guarantor
Protecting pipe, the bottom of the protection sleeve pipe is provided with chassis, and the bottom on chassis is evenly arranged with rectangular pyramid, the bottom on the chassis
Portion's movable sleeve is connected to protective shell, and the bottom movable sleeve of the bull stick is connected to guiding device.
Preferably, the clamp device includes fastening block, and the right side wall of supporting sleeve, institute are run through in the left side of the fastening block
It states and offers threaded hole on fastening block, the inner cavity activity of the threaded hole is plugged with bolt, the left side activity setting of the bolt
There is gasket, the spacer groove to match with gasket is offered on the left of the fastening block.
Preferably, the guiding device includes guide sleeve, and guide sleeve is actively socketed on the outside of drilling rod, described to lead
Connecting rod is uniformly hinged with to the bottom of outside of sleeve, and the other end of connecting rod and supporting sleeve are close to the bottom of drilling rod side
Hingedly, the side of guide sleeve is provided with limit plate at the top of the connecting rod, and is opened up on limit plate and guide sleeve
There is pin shaft hole, the inner cavity activity of the pin shaft hole is plugged with pin shaft.
Preferably, the gasket is rectangular washer, is evenly arranged with anti-slop serrations on the left of the gasket, and anti-slop serrations are from upper
Arrive down successively linear arrangement, and the vertical section of anti-slop serrations is in a ring, offered on the right side wall of the support prongs with it is anti-skidding
The anti-skidding tooth socket that tooth matches.
Preferably, be uniformly arranged at the top and bottom of the guide sleeve internal chamber wall it is fluted, and groove inner cavity activity
It is provided with ball, the pin shaft is in cone close to the side of drilling rod, and the other side of pin shaft is provided with drawstring, and drawstring is another
One end is connect with the top of guide sleeve lateral wall.
Preferably, the vertical section semicircular in shape of side of the handle far from drilling rod is socketed with rubber on the outside of the handle
Gum cover, and the convex grain of massage is evenly arranged on rubber sleeve, and massaging convex grain is hemispherical rubber convex grain.
Preferably, the supporting sleeve has that size structure is three groups identical, and three groups of supporting sleeve circular arrays distributions,
Side on the outside of the junction on the protective shell and chassis, the junction of protection sleeve pipe and contact pin and pin shaft close to drilling rod is respectively provided with
There is snap ring, and the internal chamber wall of the lateral wall on chassis, the lateral wall of contact pin and pin shaft hole is provided with the card slot to match with snap ring.
Compared with prior art, the beneficial effects of the present invention are:
1. rotating steering block, make chassis and ground keeping parallelism, increases the contact area with ground, keep the device more steady
Fixed, the side of rectangular pyramid is four planes, increases the frictional force between ground, and rotation steering block keeps contact pin and ground
Vertically, and by contact pin ground is injected, can plays the role of effective anti-skidding, the presence of baffle can further prevent the device
Accidental movement；
2. the open angles of three groups of support inserted links is fixed by match for connecting rod and guide sleeve, when drilling rod rotates,
The bottom of fixed drilling rod, and drilling rod bottom is avoided to shake；
3. changing support inserted link in the length of supporting sleeve inner cavity, nibble anti-slop serrations and anti-skidding tooth socket on gasket mutually
It closes, plays the role of the length of fixed support inserted link and supporting sleeve entirety, to change the drilling angle between drilling rod and ground
Degree, and the device is made to adapt to the ground of out-of-flatness, keep the device more stable, support is inserted in the matching of anti-slop serrations and anti-skidding tooth socket
Bar plays better fixed function.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention；
Fig. 2 is the portion A of the present invention schematic enlarged-scale view；
Fig. 3 is leg device structural schematic diagram of the present invention；
Fig. 4 is B structure enlarged drawing of the present invention.
In figure: 1 link block, 2 drilling rods, 3 handles, 4 supporting sleeves, 5 support inserted links, 6 clamp devices, 61 fastening blocks, 62 spiral shells
Pit, 63 bolts, 64 gaskets, 65 anti-slop serrations, 66 anti-skidding tooth sockets, 7 drill bits, 8 transfers, 81 steering blocks, 82 turn to slot, 83
Steering ball, 9 leg devices, 91 contact pins, 92 baffles, 93 protection sleeve pipes, 94 chassis, 95 rectangular pyramids, 96 protective shells, 10 guiding dresses
It sets, 101 guide sleeves, 102 connecting rods, 103 limit plates, 104 pin shaft holes, 105 pin shafts.
Specific embodiment
Below with reference to attached drawing, the present invention is described in detail:
It is as shown in Figs 1-4:
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1-4 is please referred to, the present invention provides a kind of technical solution: a kind of geotechnical engineering investigation drilling equipment, including connection
Block 1, the intermediate active of link block 1 are plugged with drilling rod 2, and the top of 2 left and right sides of drilling rod is provided with handle 3, the bottom of drilling rod 2
It is movably set with drill bit 7, the outside of 1 bottom of link block is uniformly hinged with supporting sleeve 4, the bottom activity of 4 inner cavity of supporting sleeve
It is plugged with support inserted link 5, supporting sleeve 4 is provided with far from the bottom of 2 side of drilling rod and fills with the fastening for supporting inserted link 5 to match
6 are set, the bottom of support inserted link 5 is provided with transfer 8, and transfer 8 includes steering block 81, and the top of steering block 81 offers
Slot 82 is turned to, and the inner cavity for turning to slot 82 is movably set with steering ball 83, the top of steering ball 83 and the bottom of support prongs 5 connect
It connects, the bottom of transfer 9 is provided with leg device 9, and leg device 9 includes contact pin 91, and the top of contact pin 91 and steering block
81 bottom connection, the outside of contact pin 91 are evenly arranged with baffle 92, and the outside movable sleeve of contact pin 91 is connected to protection sleeve pipe 93,
The bottom of protection sleeve pipe 93 is provided with chassis 94, and the bottom on chassis 94 is evenly arranged with rectangular pyramid 95, and the bottom on chassis 94 is living
Dynamic to be socketed with protective shell 96, the bottom movable sleeve of bull stick 2 is connected to guiding device 10.
Wherein, clamp device 6 includes fastening block 61, and the right side wall of supporting sleeve 4, fastening block are run through in the left side of fastening block 61
Threaded hole 62 is offered on 61, the inner cavity activity of threaded hole 62 is plugged with bolt 63, and the left side of bolt 63 is movably set with gasket
64, the left side of fastening block 61 offers the spacer groove to match with gasket 64, by rotating bolt 63, makes bolt 64 with mobile gasket
64 move left and right, and play the role of fixed effect to support inserted link 5, gasket 64 plays isolation bolt 64 and support inserted link 5, keeps away
Exempt from that support inserted link 5 is caused to wear when bolt 64 rotates, and gasket 64 plays increase and supports the contact area of inserted link 5, it can be with
Preferably fixed support inserted link 5；
Guiding device 10 includes guide sleeve 101, and guide sleeve 101 is actively socketed on the outside of drilling rod 2, guide sleeve
The bottom in 101 outsides is uniformly hinged with connecting rod 102, and the other end of connecting rod 102 and supporting sleeve 4 are close to 2 side of drilling rod
Bottom it is hinged, the top of connecting rod 102 is provided with limit plate 103 close to the side of guide sleeve 101, and limit plate 103 and leads
Pin shaft hole 104 is offered on casing 101, the inner cavity activity of pin shaft hole 104 is plugged with pin shaft 105, and passes through connecting rod 102
The open angles of three groups of support inserted links 5 is fixed with matching for guide sleeve 101, when drilling rod 2 rotates, the bottom of fixed drilling rod 2,
2 bottom of drilling rod is avoided to shake；
Gasket 64 is rectangular washer, and the left side of gasket 64 is evenly arranged with anti-slop serrations 65, and anti-slop serrations 65 from top to bottom according to
Secondary linear arrangement, and the vertical section of anti-slop serrations 65 is in a ring, offers on the right side wall of support prongs 5 and 65 phase of anti-slop serrations
The anti-skidding tooth socket 66 matched, the gasket 64 of rectangular washer and the matching of spacer groove can prevent 64 unintentional rotation of gasket, make anti-slop serrations
65 misplace with anti-skidding tooth socket 66, and the matching of anti-slop serrations 65 and anti-skidding tooth socket 66 plays better fixed function to support inserted link 5；
It is uniformly arranged fluted at the top and bottom of 101 internal chamber wall of guide sleeve, and the inner cavity of groove is movably set with rolling
Pearl, pin shaft 105 is in cone close to the side of drilling rod 2, and the other side of pin shaft 105 is provided with drawstring, and the other end of drawstring
It is connect with the top of 101 lateral wall of guide sleeve, the presence of ball reduces the friction between guide sleeve 101 and drilling rod 2, draws
The presence of rope facilitates the extraction of pin shaft 105, and prevents pin shaft 105 from surprisingly losing；
The vertical section semicircular in shape of side of the handle 3 far from drilling rod 2, the corner angle for keeping handle 3 not sharp are avoided to work
Personnel damage, and the outside of handle 3 is socketed with rubber sleeve, and the convex grain of massage are evenly arranged on rubber sleeve, and massage convex grain
The convex grain of massage for hemispherical rubber convex grain, hemispherical rubber convex grain has certain elasticity, plays massage to staff
Effect；
Supporting sleeve 4 has that size structure is three groups identical, and three groups of 4 circular arrays of supporting sleeve distributions, protective shell 96
It is respectively provided with junction, protection sleeve pipe 93 and the side of the close drilling rod 2 in junction and 105 outside of pin shaft of contact pin 91 on chassis 94
There is snap ring, and the internal chamber wall of the lateral wall on chassis 94, the lateral wall of contact pin 91 and pin shaft hole 104 is provided with and matches with snap ring
Card slot, good fixed function is played in the matching of snap ring and card slot, and facilitates disassembly and installation.
The above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to preferred embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that, it can modify to technical solution of the present invention
Or equivalent replacement should all cover without departing from the objective and range of technical solution of the present invention in claim of the invention
In range.
Claims (7)
1. a kind of geotechnical engineering investigation drilling equipment, including link block (1), it is characterised in that: the intermediate of the link block (1) is lived
Dynamic to be plugged with drilling rod (2), the top at left and right sides of the drilling rod (2) is provided with handle (3), and the bottom of the drilling rod (2) is living
Dynamic to be provided with drill bit (7), the outside of link block (1) bottom is uniformly hinged with supporting sleeve (4), the supporting sleeve (4)
The bottom activity of inner cavity be plugged with support inserted link (5), the supporting sleeve (4) far from drilling rod (2) side bottom be provided with
The bottom of the clamp device (6) that support inserted link (5) matches, support inserted link (5) is provided with transfer (8), and described turn
Include steering block (81) to device (8), offered at the top of the steering block (81) and turn to slot (82), and turns to the interior of slot (82)
Chamber is movably set with steering ball (83), and the top of the steering ball (83) is connect with the bottom of support prongs (5), the steering dress
The bottom for setting (9) is provided with leg device (9), and the leg device (9) includes contact pin (91), and the top of contact pin (91) with turn
It connects to the bottom of block (81), is evenly arranged with baffle (92) on the outside of the contact pin (91), the outside of the contact pin (91) is living
Dynamic to be socketed with protection sleeve pipe (93), the bottom of the protection sleeve pipe (93) is provided with chassis (94), and the bottom of chassis (94) is equal
Even to be provided with rectangular pyramid (95), the bottom movable sleeve of the chassis (94) is connected to protective shell (96), and the bottom of the bull stick (2) is living
It is dynamic to be socketed with guiding device (10).
2. a kind of geotechnical engineering investigation drilling equipment according to claim 1, it is characterised in that: the clamp device (6)
Including fastening block (61), the right side wall of supporting sleeve (4) is run through in the left side of the fastening block (61), opens on the fastening block (61)
Equipped with threaded hole (62), the inner cavity activity of the threaded hole (62) is plugged with bolt (63), the left side activity of the bolt (63)
It is provided with gasket (64), the spacer groove to match with gasket (64) is offered on the left of the fastening block (61).
3. a kind of geotechnical engineering investigation drilling equipment according to claim 1, it is characterised in that: the guiding device (10)
Including guide sleeve (101), and guide sleeve (101) is actively socketed on the outside of drilling rod (2), and the guide sleeve (101) is outside
The bottom of side is uniformly hinged with connecting rod (102), and the other end of connecting rod (102) and supporting sleeve (4) are close to drilling rod (2) one
The bottom of side is hinged, and the side at the top of the connecting rod (102) close to guide sleeve (101) is provided with limit plate (103), and limits
It is offered pin shaft hole (104) on position plate (103) and guide sleeve (101), the inner cavity activity of the pin shaft hole (104) is plugged with
Pin shaft (105).
4. a kind of geotechnical engineering investigation drilling equipment according to claim 2, it is characterised in that: the gasket (64) is square
Shape gasket is evenly arranged with anti-slop serrations (65) on the left of the gasket (64), and anti-slop serrations (65) are successively linear from top to bottom
Arrangement, and the vertical section of anti-slop serrations (65) is in a ring, offers on the right side wall of the support prongs (5) and anti-slop serrations (65) phase
Matched anti-skidding tooth socket (66).
5. a kind of geotechnical engineering investigation drilling equipment according to claim 3, it is characterised in that: the guide sleeve
(101) it is uniformly arranged fluted at the top and bottom of internal chamber wall, and the inner cavity of groove is movably set with ball, the pin shaft
(105) side close to drilling rod (2) is provided with drawstring in cone, and the other side of pin shaft (105), and the other end of drawstring with
The top of guide sleeve (101) lateral wall connects.
6. a kind of geotechnical engineering investigation drilling equipment according to claim 1, it is characterised in that: the handle (3) is separate
The vertical section semicircular in shape of the side of drilling rod (2) is socketed with rubber sleeve on the outside of the handle (3), and uniformly sets on rubber sleeve
It is equipped with the convex grain of massage, and massaging convex grain is hemispherical rubber convex grain.
7. a kind of geotechnical engineering investigation drilling equipment according to claim 1, it is characterised in that: the supporting sleeve (4)
Have that size structure is three groups identical, and three groups of supporting sleeve (4) circular arrays distributions, the protective shell (96) and chassis (94)
Junction, be respectively provided with close to the side of drilling rod (2) on the outside of protection sleeve pipe (93) and the junction of contact pin (91) and pin shaft (105)
There is snap ring, and the internal chamber wall of the lateral wall of chassis (94), the lateral wall of contact pin (91) and pin shaft hole (104) is provided with and snap ring
The card slot to match.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910047199.6A CN109555485A (en) | 2019-01-18 | 2019-01-18 | A kind of geotechnical engineering investigation drilling equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910047199.6A CN109555485A (en) | 2019-01-18 | 2019-01-18 | A kind of geotechnical engineering investigation drilling equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109555485A true CN109555485A (en) | 2019-04-02 |
Family
ID=65873089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910047199.6A Pending CN109555485A (en) | 2019-01-18 | 2019-01-18 | A kind of geotechnical engineering investigation drilling equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109555485A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110052647A (en) * | 2019-05-28 | 2019-07-26 | 吕谋 | A kind of structural metal plate drilling device |
| CN110230472A (en) * | 2019-06-03 | 2019-09-13 | 吴璇儿 | A kind of drilling platforms pedestal reinforcement structure |
| CN112360377A (en) * | 2020-12-07 | 2021-02-12 | 王旭 | Portable handheld drilling equipment for mountainous area |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206693914U (en) * | 2017-05-11 | 2017-12-01 | 黑龙江省金恒基工程勘察设计有限公司 | A kind of geotechnical engineering investigation drilling rig |
| CN207776806U (en) * | 2018-02-02 | 2018-08-28 | 陕西铁路工程职业技术学院 | A kind of geotechnical engineering investigation drilling rig |
| CN208010281U (en) * | 2018-04-03 | 2018-10-26 | 曾照明 | A kind of geotechnical engineering investigation drilling rig |
| CN109025839A (en) * | 2018-07-30 | 2018-12-18 | 徐州庚辰工贸有限公司 | A kind of geotechnical engineering investigation drilling rig and method |
-
2019
- 2019-01-18 CN CN201910047199.6A patent/CN109555485A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206693914U (en) * | 2017-05-11 | 2017-12-01 | 黑龙江省金恒基工程勘察设计有限公司 | A kind of geotechnical engineering investigation drilling rig |
| CN207776806U (en) * | 2018-02-02 | 2018-08-28 | 陕西铁路工程职业技术学院 | A kind of geotechnical engineering investigation drilling rig |
| CN208010281U (en) * | 2018-04-03 | 2018-10-26 | 曾照明 | A kind of geotechnical engineering investigation drilling rig |
| CN109025839A (en) * | 2018-07-30 | 2018-12-18 | 徐州庚辰工贸有限公司 | A kind of geotechnical engineering investigation drilling rig and method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110052647A (en) * | 2019-05-28 | 2019-07-26 | 吕谋 | A kind of structural metal plate drilling device |
| CN110230472A (en) * | 2019-06-03 | 2019-09-13 | 吴璇儿 | A kind of drilling platforms pedestal reinforcement structure |
| CN112360377A (en) * | 2020-12-07 | 2021-02-12 | 王旭 | Portable handheld drilling equipment for mountainous area |
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Application publication date: 20190402 |