CN206053863U - Mast folding-back rotary drilling rig - Google Patents
Mast folding-back rotary drilling rig Download PDFInfo
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- CN206053863U CN206053863U CN201621082692.XU CN201621082692U CN206053863U CN 206053863 U CN206053863 U CN 206053863U CN 201621082692 U CN201621082692 U CN 201621082692U CN 206053863 U CN206053863 U CN 206053863U
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- mast
- turntable
- hinged
- oil cylinder
- drilling rig
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- 238000005553 drilling Methods 0.000 title claims abstract description 77
- 239000000203 mixture Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 13
- 230000007246 mechanism Effects 0.000 description 13
- 239000010959 steel Substances 0.000 description 13
- 230000005484 gravity Effects 0.000 description 8
- 210000003371 toe Anatomy 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000014509 gene expression Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 210000004247 hand Anatomy 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
This utility model provides a kind of mast folding-back rotary drilling rig, including turntable, swing arm, mast, drilling rod, unit head, mast oil cylinder and amplitude oil cylinder, one end of swing arm and turntable are hinged and connected, the other end and mast are hinged and connected, one end of mast oil cylinder and turntable are hinged and connected, the other end and mast are hinged and connected, one end of amplitude oil cylinder and turntable are hinged and connected, the other end and swing arm are hinged and connected, rotary drilling rig also includes lift oil tank, one end of lift oil tank is connected with turntable, the other end is free end, lift oil tank is for stretching out and hold mast in movable mast stage or raising stage.
Description
Technical field
This utility model is related to pile foundation construction apparatus field, and more particularly to a kind of mast folding-back churning driven
Machine.
Background technology
The jib lubbing mechanism of rotary drilling rig is broadly divided into two kinds according to version：Parallelogram-type and double big trigonometric expressions.
Medium and small rotary drilling rig typically adopts parallelogram-type jib lubbing mechanism at present, and large-scale rotary drilling rig is typically using double big trigonometric expressions
Jib lubbing mechanism.
The rotary drilling rig of parallelogram-type jib lubbing mechanism can realize the folded back upon of mast by the deformation of self structure
It is folded, center of gravity is substantially reduced, is easy to short distance to shift, without multi-part was dismantled during its transport, be readily transported, but during its work
Mast oil cylinder is little to the support angle of mast, and job stability is relatively poor, is unfavorable for into rock.
The rotary drilling machine for supporting point of double big trigonometric expression jib lubbing mechanisms is relatively outer, and support angle is big, and job stability is high, just
In rock, but typically only 15 °～20 ° of its mast hypsokinesis angle is entered, center of gravity is higher, using the churning driven of double big triangle jib lubbing mechanisms
Machine is limited larger by work place when short distance is shifted, because its mast hypsokinesis limited angle, can only typically tilt backwards 15 °
～20 °, so this rotary drilling rig can not possibly cross more than 10 ° of the gradient in the case of not dismounting drilling rod, cannot also cross
Some aerial obstacles, such as electric wire, overpass etc..And short distance will be carried out in out-of-flatness or the building site for having aerial barrage and be turned
Move, it is necessary to the part such as drilling rod of dismantling, drilling tool, upper mast and catead, extremely inconvenience.
Utility model content
The purpose of this utility model is to provide a kind of mast folding-back rotary drilling rig, the mast of the rotary drilling rig
Can fold back, it is low to building site requirement in transfer transport, and also when working, mast oil cylinder support angle is larger, job stability
It is high.
This utility model provides a kind of mast folding-back rotary drilling rig, including turntable, swing arm, mast, drilling rod, dynamic
Power head, mast oil cylinder and amplitude oil cylinder, one end of swing arm and turntable are hinged and connected, and the other end and mast of swing arm are hinged phase
Even, one end of mast oil cylinder and turntable are hinged and connected, and the other end and mast of mast oil cylinder are hinged and connected, one end of amplitude oil cylinder
It is hinged and connected with turntable, the other end and swing arm of amplitude oil cylinder are hinged and connected, rotary drilling rig also includes lift oil tank, lift oil tank
One end be connected with turntable, the other end of lift oil tank is free end, and lift oil tank is for stretching in movable mast stage or raising stage
Go out and hold mast.
Further, be fixed with support beam on turntable, the quantity of mast oil cylinder is two, two mast oil cylinders it is close
One end of turntable and the two ends of support beam are hinged and connected, each mast oil cylinder, one triangle knot of composition between mast and turntable
Structure, two constitute another three-legged structure between mast oil cylinder and support beam.
Further, swing arm and turntable are hinged and connected by first axle, and swing arm and mast are hinged and connected by the second axle, mast
Rod oil cylinder and turntable are hinged and connected by the 3rd axle, and mast oil cylinder and mast are hinged and connected by the 4th axle, amplitude oil cylinder and turn
Platform is hinged and connected by the 5th axle, and amplitude oil cylinder and swing arm are hinged and connected by the 6th axle.
Further, lift oil tank is fixedly linked with turntable and not rotatable, and lift oil tank is towards an inclination of mast
Tiltedly.
Further, lift oil tank is installed in rotation on turntable, and lift oil tank can be rotated relative to turntable.
Further, cylinder barrel one end of lift oil tank is connected with turntable, piston rod one end of lift oil tank be free end and
Can be protruding relative to cylinder barrel and hold mast.
Further, the pin joint of mast oil cylinder and turntable is located at the driver's cabin a rears of rotary drilling rig, and is less than driver's cabin
A upper surfaces.
Further, mast includes lower mast and upper mast.
To sum up, the rotary drilling rig that this utility model embodiment is provided, as mast oil cylinder, mast and turntable constitute big triangle
Structure, mast oil cylinder and support beam also constitute big three-legged structure, and mast oil cylinder support angle is larger, stabilized structure, and work is steady
Qualitative height.When rotary drilling rig needs short distance to shift, mast oil cylinder and lift oil tank can be shunk, make mast, horizontal positioned,
Machine gravity is relatively low, can go everywhere without any hindrance here on the ground of great slope, also can avoid high-altitude obstacle well, in transfer transport
It is low to building site requirement, and displacement is achieved that without dismounting drilling rod and unit head under this kind of state, many times can be saved.
When rotary drilling rig needs long-distance transportation, upper mast, unit head and drilling rod are dismantled, it is not necessary to Auxiliary support.Therefore,
The jib lubbing mechanism of this rotary drilling rig has had the advantage of existing parallelogram luffing mechanism and double big triangle jib lubbing mechanisms, work concurrently
When making, stability is high, and mast can fold back, and also allows for short distance transfer.
Description of the drawings
Fig. 1 is the structural representation after this utility model embodiment rotary drilling rig omits driver's cabin.
Rotary drilling rig structural representations in working order of the Fig. 2 for Fig. 1.
Connection diagrams of the Fig. 3 for the mast oil cylinder and turntable of the rotary drilling rig in Fig. 1.
Fig. 4 be Fig. 1 in rotary drilling rig short distance travel position structural representation.
Fig. 5 is the rotary drilling rig in Fig. 1 in the structural representation that mast and horizontal plane angle are 10 °.
Fig. 6 be Fig. 1 in rotary drilling rig long-distance transport state structural representation.
Fig. 7 is that the rotary drilling rig in Fig. 1 produces what is interfered during movable mast between lift oil tank and master winch steel wire rope
Principle schematic.
Fig. 8 is that the rotary drilling rig in Fig. 1 installs the structural representation after drill pipe positioner.
Structural representations of the Fig. 9 for the drill pipe positioner in Fig. 8.
Figure 10 be Fig. 1 in rotary drilling rig movable mast step one structural representation.
Figure 11 be Fig. 1 in rotary drilling rig movable mast step 2 structural representation.
Figure 12 be Fig. 1 in rotary drilling rig movable mast step 3 structural representation.
Figure 13 be Fig. 1 in rotary drilling rig movable mast step 4 structural representation.
Specific embodiment
Further to illustrate that this utility model is to reach technical approach and effect that predetermined utility model purpose is taken,
Below in conjunction with drawings and Examples, to specific embodiment of the present utility model, structure, feature and its effect, describe in detail such as
Afterwards.
Fig. 1 is the structural representation after this utility model embodiment rotary drilling rig omits driver's cabin, in order to express in Fig. 1
It is clear, eliminate driver's cabin.Fig. 2 is the rotary drilling rig structural representation in working order of Fig. 1, and driver's cabin is contained in Fig. 2.
Please join Fig. 1 and Fig. 2, in the present embodiment, the rotary drilling rig include turntable 1, swing arm 3, mast, drilling rod 7, unit head 8, catead 9,
Mast oil cylinder 12, amplitude oil cylinder 13, support beam 16 and lift oil tank 17.In the present embodiment, mast includes 6 He of lower mast
Upper mast 10.
One end of swing arm 3 and turntable 1 are hinged and connected, and the other end and mast of swing arm 3 are hinged and connected.In the present embodiment, move
Arm 3 and turntable 1 are hinged and connected by first axle 2, and swing arm 3 and mast are hinged and connected by the second axle 5.
One end of mast oil cylinder 12 and turntable 1 are hinged and connected, and the other end and mast of mast oil cylinder 12 are hinged and connected.This reality
Apply in example, mast oil cylinder 12 and turntable 1 are hinged and connected by the 3rd axle 14, mast oil cylinder 12 and mast are hinged by the 4th axle 11
It is connected.
One end of amplitude oil cylinder 13 and turntable 1 are hinged and connected, and the other end and swing arm 3 of amplitude oil cylinder 13 are hinged and connected.This
In embodiment, amplitude oil cylinder 13 and turntable 1 are hinged and connected by the 5th axle 15, and amplitude oil cylinder 13 and swing arm 3 are cut with scissors by the 6th axle 4
Connect connected.
Connection diagrams of the Fig. 3 for the mast oil cylinder and turntable of the rotary drilling rig in Fig. 1, incorporated by reference to Fig. 3, the present embodiment
In, support beam 16 is welded with turntable 1, mast oil cylinder 12 is articulated and connected by the 3rd axle 14 near one end of turntable 1
In support beam 16, for example, otic placode (figure is not marked) can be provided with support beam 16, mast oil cylinder 12 is near turntable 1
One end is hingedly connected on the otic placode.And, the quantity of mast oil cylinder 12 is two, and two mast oil cylinders 12 are hingedly connected
In the end positions of support beam 16.It is to be appreciated that support beam 16 is not limited to welding with the connection of turntable 1, remaining connection
Mode such as bolt connection and bearing pin connection can；Support beam 16 is used as mast oil cylinder 12 and the middle knot of the connection of turntable 1
Structure, is not limited to structure shown in Fig. 3, and other structures can also.
As shown in Fig. 2 rotary drilling rig is operationally, the pin joint (i.e. the 3rd axle 14) of mast oil cylinder 12 and turntable 1 is located at
Driver's cabin a rears and the upper surface less than driver's cabin a, after folding back so as to mast, whole height meets movement requirement.Often
A big three-legged structure, stabilized structure are constituted between individual mast oil cylinder 12, mast and turntable 1.And as shown in figure 3, two masts
Also a big three-legged structure is constituted between rod oil cylinder 12 and support beam 16.Therefore, this jib lubbing mechanism forms two trianglees, knot
Structure is consolidated, and stability is high.
As shown in Figures 1 and 2, lift oil tank 17 and turntable 1 are installed together, one end and 1 phase of turntable of lift oil tank 17
Even, the other end of lift oil tank 17 is free end, and lift oil tank 17 is for stretching out and hold mast in movable mast stage or raising stage
Bar.Preferably, cylinder barrel one end of lift oil tank 17 is connected with turntable 1, and piston rod one end of lift oil tank 17 is free end and can
It is protruding relative to cylinder barrel and hold mast.In the present embodiment, lift oil tank 17 is fixed on turntable 1 and not rotatable, and
Lift oil tank 17 is inclined towards mast side, and the angle between lift oil tank 17 and horizontal plane is, for example, 80 °.It is to be appreciated that
Angle between lift oil tank 17 and turntable 1 is not limited to 80 °, and remaining angle can also.In other embodiments, lift oil tank 17
Can not also be fixedly mounted on turntable 1, and be rotatably mounted on turntable 1 so that lift oil tank 17 can surround certain
One installation axle is rotated relative to turntable 1, to facilitate the angle adjusted hoisting between oil cylinder 17 and turntable 1.
When rotary drilling rig needs short distance to shift, mast oil cylinder 12 can be shunk and reach short distance fortune as shown in Figure 4
Defeated state.Under this kind of state, mast horizontal positioned, machine gravity are relatively low, can go everywhere without any hindrance here, also can on the ground of great slope
High-altitude obstacle is avoided well.And displacement is achieved that without dismounting drilling rod 7 and unit head 8 under this kind of state, can save
Many times.It is to be appreciated that the backfolding angle of mast is not limited to 90 °, remaining can avoid the angle of high-altitude obstacle all
Can be with.
As shown in figure 5, during mast is from vertical state to horizontality, when mast and horizontal plane angle are 10 °
When, lift oil tank 17 will stretch out and hold mast.In the present embodiment, transfer from 10 ° in mast to the process of horizontality
In, mast oil cylinder 12 is in quick condition, does not provide thrust, and thrust is provided completely by lift oil tank 17.In addition, mast is from water
During level state is gradually lifted (i.e. raising stage), provide thrust simultaneously to push away by mast oil cylinder 12 and lift oil tank 17
It is dynamic, after mast lifts are more than 10 °, then turn to be promoted by mast oil cylinder 12 alone.It is to be appreciated that mast is returned from 10 ° of positions
When dropping down onto horizontality, can be promoted by lift oil tank 17 and mast oil cylinder 12 simultaneously, it is also possible to pushed away by lift oil tank 17 alone
It is dynamic；When mast rises to 10 ° from horizontality, can be promoted by lift oil tank 17 and mast oil cylinder 12 simultaneously, it is also possible to by
Oil-lifting jar 17 is promoted alone.Also, it is to be understood that ground, during mast is from vertical state to horizontality, is not limited to
When mast and horizontal plane angle are 10 °, lift oil tank 17 just stretch out and hold mast, or from vertical state to
When such as 15 ° of other predetermined angulars between horizontality, lift oil tank 17 stretches out and holds mast, then in lift oil tank
Mast is made to transfer to horizontality under 17 thrusts for providing.
As shown in fig. 6, when rotary drilling rig needs long-distance transportation, from rotary drilling rig is by upper mast 10, unit head 8 and bores
Bar 7 is dismantled, it is not necessary to Auxiliary support.
But, during band drilling rod movable mast, due to the presence of lift oil tank 17, it is possible that lift oil tank 17 and master
Hoisting rope b produces the problem interfered.As shown in fig. 7, during mast is from vertical state to horizontality, drilling rod 7
Master winch steel wire rope b is made to be in tensioned state all the time under gravity.Therefore, during lift oil tank 17 is stretched out, rise
Oil-lifting jar 17 may produce interference with master winch steel wire rope b.
This utility model embodiment is to solve the problems, such as above-mentioned interference, while optimizing machine gravity, increases on rotary drilling rig
Drill pipe positioner, as shown in Figure 8 and Figure 9, the drill pipe positioner includes square toes adapter sleeve 18 and positioning wire rope 21, wherein
Square toes adapter sleeve 18 is linked together with the bottom of drilling rod 7, and one end and the unit head 8 of positioning wire rope 21 link together,
The other end of positioning wire rope 21 is linked together with square toes adapter sleeve 18.Specifically, in the present embodiment, square toes adapter sleeve 18 leads to
The bottom that the 7th bearing pin 19 is crossed with drilling rod 7 links together, and 21 two ends of positioning wire rope bypass two steel wire rope collars respectively
23 and fixed with rope clamp 22, one of steel wire rope collar 23 is linked together with unit head 8 by the 8th bearing pin 23, separately
One steel wire rope collar 23 is linked together with square toes adapter sleeve 18 by the 9th bearing pin 20.The length of positioning wire rope 21 according to
Actual requirement is set.
So, as long as by drilling rod 7 to certain position is transferred to, then positioning wire rope 21 will be tightened, and master winch steel wire
Rope b will relax.As long as before lift oil tank 17 is interfered with master winch steel wire rope b, making master winch steel wire rope b in lax shape
State, then rig personnel just master winch steel wire rope b can be drawn apart with handss, it is to avoid which is interfered with lift oil tank 17.
Above-mentioned rotary drilling rig is illustrated below again on the premise of not dismounting drilling rod 7, the method with drilling rod movable mast is realized.
First, as shown in Figure 10, before movable mast is carried out, unit head 8 is transferred to the lower end of mast, drilling rod 7 is transferred
To ground, drill pipe positioner is installed between the bottom of unit head 8 and drilling rod 7 then.
Then, as shown in figure 11, shrinking mast oil cylinder 12 makes mast movable mast backward, while lowering drill pipes 7, until drilling rod is determined
The positioning wire rope 21 of position device is in tensioned state, and now master winch steel wire rope b is in relaxed state, can be by rig operations people
Master winch steel wire rope b is pushed into member the outside of lift oil tank 17, so that during lift oil tank 17 stretches out, lift oil tank 17
Interference is not produced and master winch steel wire rope b between.
Then, as shown in figure 12, when movable mast is to arrival predetermined angular (such as 10 °) between horizontal plane backward for mast, stretch
Go out lift oil tank 17, lift oil tank 17 is entered with mast and contact to hold mast.
Finally, as shown in figure 13, lift oil tank 17 is shunk until mast movable mast is to horizontality.Due to drill pipe positioner
Presence, during the movable mast in mast from vertical state to horizontality, drilling rod 7 be in earlier position, Neng Gouyou
Effect balance machine gravity.
In sum, the rotary drilling rig that this utility model embodiment is provided, due to 1 structure of mast oil cylinder 12, mast and turntable
Into big three-legged structure, mast oil cylinder 12 and support beam 16 also constitute big three-legged structure, and 12 support angle of mast oil cylinder is larger, knot
Structure is consolidated, and job stability is high.When rotary drilling rig needs short distance to shift, mast oil cylinder 12 and lift oil tank can be shunk
17, mast horizontal positioned is made, machine gravity is relatively low, can go everywhere without any hindrance here on the ground of great slope, also can avoid height well
Empty obstacle, it is low to building site requirement in transfer transport, and achieve that without dismounting drilling rod 7 and unit head 8 under this kind of state
Displacement, can save many times.When rotary drilling rig needs long-distance transportation, upper mast 10, unit head 8 and drilling rod 7 are torn open
Fall, it is not necessary to Auxiliary support.Therefore, the jib lubbing mechanism of this rotary drilling rig has had existing parallelogram luffing mechanism concurrently
With the advantage of double big triangle jib lubbing mechanisms, during work, stability is high, and mast can fold back, and also allows for short distance transfer.
The above is only preferred embodiment of the present utility model, not make any pro forma limit to this utility model
System, although this utility model is disclosed above with preferred embodiment, but is not limited to this utility model, any to be familiar with sheet
Technical professional, in the range of without departing from technical solutions of the utility model, when the technology contents using the disclosure above are made
Go out a little change or be modified to the Equivalent embodiments of equivalent variations, as long as be without departing from technical solutions of the utility model content, according to
Any simple modification, equivalent variations and the modification made to above example according to technical spirit of the present utility model, still falls within
In the range of technical solutions of the utility model.
Claims (8)
1. a kind of mast folding-back rotary drilling rig, including turntable (1), swing arm (3), mast, drilling rod (7), unit head
(8), mast oil cylinder (12) and amplitude oil cylinder (13), one end of the swing arm (3) and the turntable (1) are hinged and connected, described
The other end and the mast of swing arm (3) is hinged and connected, and one end of the mast oil cylinder (12) and the turntable (1) are hinged phase
Even, the other end and the mast of the mast oil cylinder (12) are hinged and connected, one end of the amplitude oil cylinder (13) and described turn
Platform (1) is hinged and connected, and the other end and the swing arm (3) of the amplitude oil cylinder (13) are hinged and connected, it is characterised in that the rotation
Digging rig also includes lift oil tank (17), and one end of the lift oil tank (17) is connected with the turntable (1), the lift oil tank
(17) the other end is free end, and the lift oil tank (17) is for stretching out in movable mast stage or raising stage and hold the mast
Bar.
2. mast folding-back rotary drilling rig as claimed in claim 1, it is characterised in that fixed on the turntable (1)
There is support beam (16), the quantity of the mast oil cylinder (12) is two, close described turn of two mast oil cylinders (12)
One end of platform (1) and the two ends of the support beam (16) are hinged and connected, each mast oil cylinder (12), the mast and institute
One three-legged structure of composition between turntable (1) is stated, is constituted between two mast oil cylinders (12) and the support beam (16)
Another three-legged structure.
3. mast folding-back rotary drilling rig as claimed in claim 1, it is characterised in that the swing arm (3) and described
Turntable (1) is hinged and connected by first axle (2), and the swing arm (3) and the mast are hinged and connected by the second axle (5), described
Mast oil cylinder (12) and the turntable (1) are hinged and connected by the 3rd axle (14), and the mast oil cylinder (12) and the mast are logical
Cross the 4th axle (11) to be hinged and connected, the amplitude oil cylinder (13) and the turntable (1) are hinged and connected by the 5th axle (15), described
Amplitude oil cylinder (13) and the swing arm (3) are hinged and connected by the 6th axle (4).
4. mast folding-back rotary drilling rig as claimed in claim 1, it is characterised in that the lift oil tank (17) with
The turntable (1) is fixedly linked and not rotatable, and the lift oil tank (17) is inclined towards the side of the mast.
5. mast folding-back rotary drilling rig as claimed in claim 1, it is characterised in that the lift oil tank (17) can
It is rotatably mounted on the turntable (1), the lift oil tank (17) can be rotated relative to the turntable (1).
6. mast folding-back rotary drilling rig as claimed in claim 1, it is characterised in that the lift oil tank (17)
Cylinder barrel one end is connected with the turntable (1), and piston rod one end of the lift oil tank (17) is free end and can be relative to cylinder barrel
It is protruding and hold the mast.
7. mast folding-back rotary drilling rig as claimed in claim 1, it is characterised in that the mast oil cylinder (12) and
The pin joint of the turntable (1) is located at driver's cabin (a) rear of the rotary drilling rig, and is less than driver's cabin (a) upper surface.
8. mast folding-back rotary drilling rig as claimed in claim 1, it is characterised in that the mast includes lower mast
And upper mast (10) (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621082692.XU CN206053863U (en) | 2016-09-26 | 2016-09-26 | Mast folding-back rotary drilling rig |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621082692.XU CN206053863U (en) | 2016-09-26 | 2016-09-26 | Mast folding-back rotary drilling rig |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206053863U true CN206053863U (en) | 2017-03-29 |
Family
ID=58367550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621082692.XU Withdrawn - After Issue CN206053863U (en) | 2016-09-26 | 2016-09-26 | Mast folding-back rotary drilling rig |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206053863U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106223865A (en) * | 2016-09-26 | 2016-12-14 | 上海中联重科桩工机械有限公司 | Mast folding-back rotary drilling rig and the method for band drilling rod movable mast |
-
2016
- 2016-09-26 CN CN201621082692.XU patent/CN206053863U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106223865A (en) * | 2016-09-26 | 2016-12-14 | 上海中联重科桩工机械有限公司 | Mast folding-back rotary drilling rig and the method for band drilling rod movable mast |
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Granted publication date: 20170329 Effective date of abandoning: 20181012 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20170329 Effective date of abandoning: 20181012 |