CN109488217A - A kind of electric drill with square base - Google Patents
A kind of electric drill with square base Download PDFInfo
- Publication number
- CN109488217A CN109488217A CN201811653514.1A CN201811653514A CN109488217A CN 109488217 A CN109488217 A CN 109488217A CN 201811653514 A CN201811653514 A CN 201811653514A CN 109488217 A CN109488217 A CN 109488217A
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- China
- Prior art keywords
- carriage
- support beam
- square base
- electric drill
- gear
- 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.)
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- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 6
- 238000005553 drilling Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000007790 scraping Methods 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
- E21B15/00—Supports for the drilling machine, e.g. derricks or masts
-
- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
Abstract
A kind of electric drill with square base disclosed by the invention, including square base, support beam is equipped in the square base, it is slidably connected between support beam both ends and square base, first carriage and second carriage are equipped between electric drill and support beam, it is slidably connected between second carriage and support beam, first carriage and second carriage are slidably connected, and electric drill is mounted in first carriage;In boring procedure, electric drill is fixed in first carriage, square base is placed in foundation pit later, up and down adjustment support beam front end, and first carriage is moved left and right along second carriage, so that drill bit is directed at hole location, bit location is easy to adjust, practicability is good, while also worker being facilitated to drill, and reduces labor intensity.
Description
Technical field
The present invention relates to electric drill drilling technique field, specifically a kind of electric drill with square base.
Background technique
Electric drill working principle is that the rotor of electromagnetic rotation or electromagnetic reciprocating small capacity motor does magnetic field intercepts
Acting operating drives apparatus for work by transmission mechanism, the power of drill bit is increased with moving gear, to make drill bit scrapings body surface
Object is preferably pierced in face.
Existing electric drill is in drilling, especially when drilling on foundation pit side-wall, user oneself is needed to adjust the water of drill bit
Prosposition is set, it will usually because the problems such as drill bit sliding punch position is inaccurate caused by experience deficiency, cause bore position unqualified.
Summary of the invention
The purpose of the present invention is to solve the above problem, provides an electric drill with square base, can guarantee drill bit level, beats
Hole site is accurate.
The technical scheme adopted by the invention to solve the technical problem is that:
A kind of electric drill with square base, including square base, the square base is interior to be equipped with support beam, support beam
Be slidably connected between both ends and square base, between electric drill and support beam be equipped with first carriage and second carriage, second
It is slidably connected between sliding rack and support beam, first carriage and second carriage are slidably connected, and it is sliding that electric drill is mounted on first
In moving frame;
The square base rear end be equipped with driving support beam rotation driving mechanism, the driving mechanism include column,
Shell, rack and pinion, the rack gear are located at column side, are slidably connected between shell and column, turn between gear and shell
Dynamic connection, wheel and rack engagement, is equipped with self-locking mechanism between gear and shell.
Further, the support beam is telescopic rod, is slidably connected between support beam both ends and square base, is supported
There are two crossbeam is set, it is located at square base left and right ends.
Further, the support beam rear and front end is equipped with sleeve, and support beam front end sleeve and square base are vertical
The first lock-screw is equipped between column.
Further, further, the second carriage both ends are equipped with first sliding groove, and support beam upper end is equipped with first
Slideway, first sliding groove and the first slideway cooperate.
Further, first carriage both ends are equipped with second sliding slot, and second carriage is equipped with the second slideway, second sliding slot
Cooperate with the second slideway, the first carriage front end is equipped with connecting plate, and connecting plate is equipped with the second lock-screw.
Further, the first carriage is equipped with set casing, and electric drill and set casing cooperate, and electric drill, which is equipped with, to be fixed
Block, set casing both ends are equipped with baffle, and fixed block both ends contact with baffle, are connected by screw between fixed block and baffle.
Further, the shell includes cylindrical portion and square department, and cylindrical portion and column cooperate, and gear is located at square department
Interior, gear is equipped with shaft, is rotatablely connected between shaft and square department, and roller end is equipped with handle, and the square department end is set
There is end cap.
The self-locking mechanism includes pawl and extension spring, is rotatablely connected between the pawl lower end and square department, pawl
Upper end and gear cooperate, and square department lower end is equipped with fixed plate, and extension spring upper end is connect with pawl, extension spring lower end and fixation
Plate connection, pawl lateral ends are contacted with end cap, and pawl end is equipped with driving lever.
The support beam is equipped with horizontal testing agency, and horizontal testing agency includes fanning strip and weight, on fanning strip
End is connect with support beam, and fanning strip is equipped with scale, and the weight is fallen by movement weight cable in fanning strip middle position.
The beneficial effects of the present invention are:
1, square base of the present invention, is equipped with support beam in the square base, support beam both ends and square base it
Between be slidably connected, first carriage and second carriage, second carriage and support beam are equipped between electric drill and support beam
Between be slidably connected, first carriage and second carriage are slidably connected, and electric drill is mounted in first carriage, in boring procedure
In, electric drill is fixed in first carriage, square base is placed in foundation pit later, up and down adjustment support beam front end,
And first carriage is moved left and right along second carriage, so that drill bit is directed at hole location, bit location is easy to adjust, practicability
It is good, while worker also being facilitated to drill, reduce labor intensity.
2, square base rear end of the present invention is equipped with the driving mechanism of driving support beam rotation, and the driving mechanism includes vertical
Column, shell, rack and pinion, the rack gear are located at column side, are slidably connected between shell and column, between gear and shell
Rotation connection, wheel and rack engagement are equipped with self-locking mechanism between gear and shell, rotate gear passes through gear and rack gear
So that rack and pinion is moved up and down along column, shell drives support beam rear end to move up and down for effect, adjusts drill bit
Horizontal position degree, after drill bit level, support beam rear end is locked by self-locking mechanism, preceding to have mobile second carriage in Foundation Pit
It drills on wall, facilitates and adjust drill bit level, punch position is accurate.
3, self-locking mechanism includes pawl and extension spring, the company of rotation between the pawl lower end and square department in the present invention
It connects, pawl upper end and gear cooperate, and square department lower end is equipped with fixed plate, and extension spring upper end is connect with pawl, under extension spring
End is connect with fixed plate, and pawl lateral ends are contacted with end cap, and pawl end is equipped with driving lever, when shell moves up, tooth at this time
Wheel rotates clockwise, and when shell rises to suitable position, gear cannot be rotated counterclockwise under the action of pawl, prevents shell
Body slide downward, good reliability stirs pawl by driving lever when needing to move down shell, so that pawl overcomes stretching bullet
The pulling force of spring rotates counterclockwise, and pawl is separated with gear, at this time can rotate gear counterclockwise so that shell decline, facilitate support
Crossbeam adjusts level, and practicability is good.
4, support beam is equipped with horizontal testing agency in the present invention, and horizontal testing agency includes fanning strip and weight, fan
Shape plate upper end is connect with support beam, and fanning strip is equipped with scale, and the weight is fallen by movement weight cable in fanning strip middle position,
It may determine that whether support beam is in a horizontal position by the scale on weight and fanning strip, to guarantee drill bit water
It is flat, good reliability.
5, second carriage both ends are equipped with first sliding groove in the present invention, and support beam upper end is equipped with the first slideway, and first is sliding
Slot and the first slideway cooperate, and first slideway of the second carriage in support beam moves left and right, and drilling when passes through promotion
Second carriage can drill on foundation pit side-wall, reduce exerting oneself for the master worker that drills when drilling, facilitate drilling, practicability
It is good.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without creative efforts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is schematic structural view of the invention one;
Fig. 2 is schematic structural view of the invention two;
Fig. 3 is first carriage of the present invention, second carriage and electric drill fit structure schematic diagram;
Fig. 4 is first carriage of the present invention and second carriage fit structure schematic diagram;
Fig. 5 is first carriage structural schematic diagram of the present invention;
Fig. 6 is driving mechanism cross-sectional view of the present invention;
Fig. 7 is driving mechanism top view of the present invention.
In figure: square base 1, support beam 2, first carriage 3, second carriage 4, electric drill 5, column 6, shell 7, tooth
Item 8, gear 9, the first lock-screw 10, first sliding groove 11, the first slideway 12, second sliding slot 13, the second slideway 14, connecting plate
15, the second lock-screw 16, set casing 17, fixed block 18, baffle 19, cylindrical portion 20, square department 21, shaft 22, handle 23, end
Lid 24, pawl 25, extension spring 26, fixed plate 27, driving lever 28, fanning strip 29, weight 30, scale 31, movement weight cable 32.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work, all should belong to protection of the present invention
Range.
For convenience of description, it is as shown in Figure 1 now to define coordinate system.
As shown in figs. 1,2 and 6, a kind of electric drill with square base, including square base 1, in the square base 1
It equipped with support beam 2, is slidably connected between 2 both ends of support beam and square base 1, the is equipped between electric drill 5 and support beam 2
One sliding rack 3 and second carriage 4, are slidably connected between second carriage 4 and support beam 2, and first carriage 3 and second is slided
Moving frame 4 is slidably connected, and electric drill 5 is mounted in first carriage 3;1 rear end of square base is equipped with driving support beam 2 and rotates
Driving mechanism, the driving mechanism includes column 6, shell 7, rack gear 8 and gear 9, and the rack gear 8 is located at 6 side of column, shell
It is slidably connected between body 7 and column 6, is rotatablely connected between gear 9 and shell 7, gear 9 is engaged with rack gear 8, gear 9 and shell 7
Between be equipped with self-locking mechanism.
In boring procedure, electric drill 5 is fixed in first carriage 3, square base 1 is placed in foundation pit later,
2 front end of up and down adjustment support beam, and first carriage 3 is moved left and right along second carriage 4, so that 5 drill bit alignment hole of electric drill
Position, bit location is easy to adjust, and practicability is good, while also worker being facilitated to drill, and reduces labor intensity, later rotate gear 9, leads to
The effect of gear 9 and rack gear 8 is crossed so that rack gear 8 and gear 9 are moved up and down along column 6, shell 7 drives on 2 rear end of support beam
Lower movement adjusts the horizontal position degree of 5 drill bit of electric drill, and after drill bit level, 2 rear end of support beam is locked by self-locking mechanism, preceding
There is mobile second carriage 4 to drill in foundation pit crater wall, ensure that 5 drill bit of electric drill is horizontal, punch position is accurate, is equipped with from lock machine
Structure realizes that 2 rear end of support beam is self-locking, and easy to operate, practicability is good.
As shown in Figure 1, the support beam 2 is telescopic rod, it is slidably connected between 2 both ends of support beam and square base 1,
There are two support beam 2 is set, 1 left and right ends of square base are located at, support beam 2 is being supported using the form of telescopic rod
In 2 rotation process of crossbeam, since square base 1 is fixed frame, the form of telescopic rod can adapt to the rotation of support beam 2,
Practicability is good.
As shown in Figure 1,2 rear and front end of support beam is equipped with sleeve 9,2 front end sleeve 9 of support beam and rectangular base
It is equipped with the first lock-screw 10 between 1 column of seat, by 10 locking sleeve 9 of the first lock-screw and 1 column of square base, thus
Position the height of 5 drill bit of electric drill, good reliability.
As shown in figures 1 and 3, shown, 4 both ends of second carriage are equipped with first sliding groove 11, and 2 upper end of support beam is set
There is the first slideway 12, first sliding groove 11 and the first slideway 12 cooperate, first slideway 12 of the second carriage 4 in support beam 2
It moves left and right, by pushing second carriage 4 that can drill on foundation pit side-wall when drilling, drills when reducing drilling
Master worker's exerts oneself, and facilitates drilling, practicability is good.
As described in Fig. 4 and Fig. 5,3 both ends of first carriage are equipped with second sliding slot 13, and it is sliding that second carriage 4 is equipped with second
Road 14, second sliding slot 13 and the second slideway 14 cooperate, and 3 front end of first carriage is equipped with connecting plate 15, set on connecting plate 15
There is the second lock-screw 16, first carriage 3 is moved left and right along second carriage 4, and is locked by the second lock-screw 16, side
Just the horizontal position of 5 drill bit of electric drill is adjusted.
As shown in Figure 3 and Figure 5, the first carriage 3 is equipped with set casing 17, and set casing 17 is fixed on first carriage
On 3, electric drill 5 and set casing 17 cooperate, and electric drill 5 is equipped with fixed block 18, and 17 both ends of set casing are equipped with baffle 19, and 18 liang of fixed block
End is contacted with baffle 19, is connected by screw between fixed block 18 and baffle 19, the slot cylindrical of set casing 17, and electric drill 5 is installed
In cylindrical groove, to realize the fixation of electric drill 5.
As shown in Figure 6 and Figure 7, the shell 7 includes cylindrical portion 20 and square department 21, and cylindrical portion 20 and column 6 cooperate, tooth
Wheel 9 is located in square department 21, and gear 9 is equipped with shaft 22, is rotatablely connected between shaft 22 and square department 21,22 end of shaft is set
There is handle 23, is fixedly connected between handle 23 and shaft 22, by 23 rotate gear 9 of handle, thus realize that shell moves up and down,
21 end of square department is equipped with end cap 24, is connected by screw between end cap 24 and square department.
As depicted in figs. 1 and 2, the self-locking mechanism includes pawl 25 and extension spring 26,25 lower end of pawl and side
It is rotatablely connected between shape portion 21,25 upper end of pawl and gear 9 cooperate, and 21 lower end of square department is equipped with fixed plate 27, extension spring 26
Upper end is connect with pawl 25, and 26 lower end of extension spring is connect with fixed plate 27, and 25 lateral ends of pawl are contacted with end cap 24, herein
Described lateral ends refer to that one end far from gear, 25 end of pawl are equipped with driving lever 28, and driving lever 28 stretches out square department 21, works as shell
7 when moving up, and gear 9 rotates clockwise at this time, and pawl 25 can not stop gear 9 to rotate, but pawl 25 is in extension spring
It is fitted close under the action of 26 with gear 9, when shell 7 rises to suitable position, gear 9 cannot under the action of pawl 25
It rotates counterclockwise, prevents 7 slide downward of shell, good reliability stirs spine by driving lever 28 when needing to move down shell 7
Pawl 25, so that pawl 25 overcomes the pulling force of extension spring 26 to rotate counterclockwise, pawl 25 is separated with gear 9, at this time can be counterclockwise
Rotate gear 9, so that shell 7 declines.
The support beam 2 is equipped with horizontal testing agency, and horizontal testing agency includes fanning strip 29 and weight 30, sector
29 upper end of plate is connect with support beam 2, and fanning strip 29 is equipped with scale 31, and the weight 30 is fallen by movement weight cable 32 in fanning strip
29 middle positions may determine that whether support beam 2 is in a horizontal position by the scale on weight 30 and fanning strip 29, thus
Guarantee that drill bit is horizontal, good reliability.
In the description of this invention, it should be noted that the orientation of the instructions such as term "left", "right", "upper", "lower" or
Positional relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplification of the description, without
It is that the device of indication or suggestion meaning or element must have a particular orientation, be constructed and operated in a specific orientation, therefore not
It can be interpreted as limitation of the present invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected;It can
To be mechanical connection, it is also possible to be electrically connected, can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Claims (9)
1. a kind of electric drill with square base, characterized in that including square base (1), support is equipped in the square base (1)
Crossbeam (2) is slidably connected between support beam (2) both ends and square base (1), is equipped between electric drill (5) and support beam (2)
First carriage (3) and second carriage (4), are slidably connected between second carriage (4) and support beam (2), the first sliding
Frame (3) and second carriage (4) are slidably connected, and electric drill (5) is mounted on first carriage (3);
Square base (1) rear end is equipped with the driving mechanism of driving support beam (2) rotation, and the driving mechanism includes column
(6), shell (7), rack gear (8) and gear (9), the rack gear (8) is located at column (6) side, between shell (7) and column (6)
Be slidably connected, be rotatablely connected between gear (9) and shell (7), gear (9) is engaged with rack gear (8), gear (9) and shell (7) it
Between be equipped with self-locking mechanism.
2. a kind of electric drill with square base according to claim 1, characterized in that the support beam (2) is flexible
Bar is slidably connected between support beam (2) both ends and square base (1), and support beam (2) is located at rectangular there are two setting
Pedestal (1) left and right ends.
3. a kind of electric drill with square base according to claim 2, characterized in that two before and after the support beam (2)
End is equipped with sleeve (9), and the first lock-screw is equipped between support beam (2) front end sleeve (9) and square base (1) column
(10)。
4. a kind of electric drill with square base according to claim 1, characterized in that second carriage (4) both ends
Equipped with first sliding groove (11), support beam (2) upper end is equipped with the first slideway (12), and first sliding groove (11) is matched with the first slideway (12)
It closes.
5. a kind of electric drill with square base according to claim 1, characterized in that first carriage (3) both ends are equipped with
Second sliding slot (13), second carriage (4) are equipped with the second slideway (14), and second sliding slot (13) and the second slideway (14) cooperate,
First carriage (3) front end is equipped with connecting plate (15), and connecting plate (15) is equipped with the second lock-screw (16).
6. a kind of electric drill with square base according to claim 1, characterized in that set on the first carriage (3)
Have set casing (17), electric drill (5) and set casing (17) cooperate, and electric drill (5) is equipped with fixed block (18), and set casing (17) both ends are set
Have baffle (19), fixed block (18) both ends are contacted with baffle (19), are connected by screw between fixed block (18) and baffle (19).
7. a kind of electric drill with square base according to claim 1, characterized in that the shell (7) includes cylindrical portion
(20) cooperate with square department (21), cylindrical portion (20) and column (6), gear (9) is located in square department (21), and gear is set on (9)
Have shaft (22), be rotatablely connected between shaft (22) and square department (21), shaft (22) end is equipped with handle (23), described rectangular
Portion (21) end is equipped with end cap (24).
8. a kind of electric drill with square base according to claim 1, characterized in that the self-locking mechanism includes pawl
(25) and extension spring (26) it, is rotatablely connected between pawl (25) lower end and square department (21), pawl (25) upper end and tooth
(9) cooperation is taken turns, square department (21) lower end is equipped with fixed plate (27), and extension spring (26) upper end is connect with pawl (25), stretches bullet
Spring (26) lower end is connect with fixed plate (27), and pawl (25) lateral ends are contacted with end cap (24), and pawl (25) end is equipped with driving lever
(28)。
9. a kind of electric drill with square base according to claim 1, characterized in that the support beam (2) is equipped with
Horizontal testing agency, horizontal testing agency include fanning strip (29) and weight (30), fanning strip (29) upper end and support beam (2)
Connection, fanning strip (29) are equipped with scale (31), and the weight (30) is fallen by movement weight cable (32) in fanning strip (29) interposition
It sets.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201811653514.1A CN109488217B (en) | 2018-12-29 | 2018-12-29 | Electric drill with square base |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201811653514.1A CN109488217B (en) | 2018-12-29 | 2018-12-29 | Electric drill with square base |
Publications (2)
Publication Number | Publication Date |
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CN109488217A true CN109488217A (en) | 2019-03-19 |
CN109488217B CN109488217B (en) | 2020-05-19 |
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ID=65713643
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CN201811653514.1A Active CN109488217B (en) | 2018-12-29 | 2018-12-29 | Electric drill with square base |
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CN (1) | CN109488217B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114809019A (en) * | 2022-05-28 | 2022-07-29 | 上海山安建设工程有限公司 | Foundation pit supporting structure and foundation pit construction method |
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CN206561151U (en) * | 2017-03-03 | 2017-10-17 | 西安科技大学 | A kind of portable hand electric drill support |
CN108044152A (en) * | 2017-12-20 | 2018-05-18 | 四川建筑职业技术学院 | A kind of ceiling turn hole auxiliary device of packaged type |
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CN108526544A (en) * | 2018-04-13 | 2018-09-14 | 陆永柱 | The drilling device to drill for building ceiling or metope |
CN207879254U (en) * | 2017-12-15 | 2018-09-18 | 国家电网公司 | A kind of trackside horizontal drilling device |
CN108818764A (en) * | 2018-07-16 | 2018-11-16 | 陈天生 | Timber horizontal drilling device |
CN108971568A (en) * | 2018-09-04 | 2018-12-11 | 扬中奇佩智能装配科技有限公司 | A kind of rotatable double drill bit automatic punches of piping lane self-balancing |
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DE3245131C1 (en) * | 1982-12-07 | 1984-05-24 | Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart | Apparatus for drilling in underground excavations |
EP0270458A1 (en) * | 1986-12-02 | 1988-06-08 | Gilles Delbaere | Ground drilling device working along a substantially horizontal axis |
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CN108971568A (en) * | 2018-09-04 | 2018-12-11 | 扬中奇佩智能装配科技有限公司 | A kind of rotatable double drill bit automatic punches of piping lane self-balancing |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN114809019A (en) * | 2022-05-28 | 2022-07-29 | 上海山安建设工程有限公司 | Foundation pit supporting structure and foundation pit construction method |
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Publication number | Publication date |
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CN109488217B (en) | 2020-05-19 |
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