CN107100565A - The hydraulic back-up tongs that vertical float is positioned and locked - Google Patents
The hydraulic back-up tongs that vertical float is positioned and locked Download PDFInfo
- Publication number
- CN107100565A CN107100565A CN201710347852.1A CN201710347852A CN107100565A CN 107100565 A CN107100565 A CN 107100565A CN 201710347852 A CN201710347852 A CN 201710347852A CN 107100565 A CN107100565 A CN 107100565A
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- Prior art keywords
- vertical float
- tong
- tooth
- locking
- positioning
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- 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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- 210000000080 chela (arthropods) Anatomy 0.000 claims abstract description 35
- 230000000712 assembly Effects 0.000 claims abstract description 7
- 238000000429 assembly Methods 0.000 claims abstract description 7
- 238000009826 distribution Methods 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000005553 drilling Methods 0.000 abstract description 11
- 238000010276 construction Methods 0.000 abstract description 3
- 230000007704 transition Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008092 positive effect Effects 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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/16—Connecting or disconnecting pipe couplings or joints
-
- 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 the hydraulic back-up tongs of a kind of positioning of vertical float and locking, it includes back-up tong, vertical float oil cylinder, is connected to the vertical float guiding assemblage of back-up tong and is arranged in the back-up tong guide rail of vertical float guiding assemblage；Back-up tong includes housing, and housing is provided with through hole, and through hole runs through provided with two pincers tooth assemblies in the upper surface and lower surface of housing, housing, and two pincers tooth assemblies are distributed with the Central Symmetry of through hole；Provided with positioning and fastening system between back-up tong guide rail and vertical float guiding assemblage；Positioning includes the slider-crank mechanism for locking back-up tong guide rail and the handle for driving slider-crank mechanism with fastening system.The back-up tong of the present invention, which can be realized, automatically clamps drilling rod or casing centering, reduces erection device, simple in construction；Engaged in back-up tong floating stroke using rack and tooth block, convenient and swift can complete back-up tong in the default position of stroke and locking, improve operating efficiency.
Description
Technical field
The present invention relates to oil-gas drilling equipment technical field, more particularly to a kind of vertical float positioning and locking
Hydraulic back-up tongs.
Background technology
In oil-gas drilling equipment, top drive system is important equipment.Wherein, back-up tong is to push up in drive system to unload
Indispensable part when drilling rod, dismounting inner blowout preventer and replacing tap crossover sub.But, current back-up tong is being torn open
When unloading inner blowout preventer and changing tap crossover sub, other equipment is also needed to and artificial auxiliary along the positioning and locking of back-up tong guide rail
Help completion, anchor point is limited and during operating cost, it can be common that positioning hole is provided with back-up tong guide rail, by manually by above and below back-up tong
It is moved to after positioning hole and is positioned with bearing pin, its automaticity and operating efficiency is all very low.When driving drillng operation on top, back-up tong dress
Put and directly affect top and drive overall operating efficiency and reliability, its main function be during completing drilling well and making a trip it is upper,
The clamping of shackle drilling tool.The back-up tong structure of top drive both at home and abroad is more complicated at present, and drilling rod or sleeve pipe centering need to set up auxiliary before clamping
Centering erection device, and it is upper, unload automatically and manually inner blowout preventer system and tap crossover sub when there is back-up tong
Fix the problems such as cumbersome, stroke is not enough.
The content of the invention
The technical problem to be solved in the present invention is that there is provided a kind of vertical floating in order to overcome the drawbacks described above that prior art is present
The hydraulic back-up tongs of dynamic positioning and locking.
The present invention is to solve above-mentioned technical problem by following technical proposals：
A kind of hydraulic back-up tongs of vertical float positioning and locking, it includes back-up tong, vertical float oil cylinder, is connected to back-up tong
The vertical float guiding assemblage of body and the back-up tong guide rail for being arranged in vertical float guiding assemblage, one end of vertical float oil cylinder are connected
In back-up tong guide rail, the other end is connected to vertical float guiding assemblage and back-up tong simultaneously；Back-up tong includes housing, and housing is provided with
Through hole, through hole runs through provided with two pincers tooth assemblies in the upper surface and lower surface of housing, housing, and two pincers tooth assemblies are with through hole
The heart is symmetrical；Provided with positioning and fastening system between back-up tong guide rail and vertical float guiding assemblage；Positioning and fastening system bag
Include the slider-crank mechanism for locking back-up tong guide rail and the handle for driving slider-crank mechanism；The slider-crank mechanism bag
Include push handle before tooth block, push handle, tooth block and the tooth block chute on vertical float guiding assemblage after tooth block, push handle and tooth before tooth block
Between push handle it is axle connection after block between push handle, after tooth block and tooth block；Tooth block is slidedly arranged in tooth block chute；Handle is fixedly arranged on tooth
Push handle before block；Rack is installed with back-up tong guide rail, the teeth of tooth block and the teeth of rack are oppositely arranged.
It is preferred that being additionally provided with support on vertical float guiding assemblage, handle is connected on support by bearing pin.
It is preferred that vertical float guiding assemblage is provided with the lock for being used for pinning handle.
It is preferred that tooth block chute is welded in vertical float guiding assemblage, or tooth block chute is shaped in vertical float
Guiding assemblage；Support is welded in vertical float guiding assemblage, or support is shaped in vertical float guiding assemblage；Rack leads to
Cross bolt and be fixed on back-up tong guide rail, or rack by being fixedly welded on back-up tong guide rail.
It is preferred that pincers tooth assembly includes driving oil cylinder, pliers tooth base and pincers tooth, pliers tooth base is fixedly arranged on the stretching of driving oil cylinder
End, pincers tooth is fixedly arranged on pliers tooth base.
It is preferred that pliers tooth base includes the center section part and the edge part located at middle part two ends for placement pliers tooth, stage casing
Portion is arc, and edge part is to diagonally distribute.
It is preferred that pincers tooth assembly includes three pincers teeth, three pincers curved distributions of tooth.
It is preferred that the lower surface of housing is provided with footwear are led, footwear are led for funnel-form, footwear and through hole insertion are led.
It is preferred that the top of vertical float guiding assemblage is provided with first boss, the top of back-up tong is provided with second boss, hung down
The bottom of straight floating cylinder is provided with ear mount, and ear mount is fixed in first boss and second boss simultaneously.
It is preferred that the bottom of back-up tong guide rail is provided with protection board.
The positive effect of the present invention is：The present invention, which can be realized, automatically clamps drilling rod or casing centering, reduces
Erection device, it is simple in construction；Positioning follows top drive back-up tong and vertical float guiding assemblage same along back-up tong guide rail with fastening system
Moved further, using the principle of slider-crank mechanism by rack tooth block, engagement, can rapidly realize the requirement of positioning and locking,
Improve operating efficiency；And use the limit dead point mode of slider-crank mechanism and outside lock is set up for set lever, reach
The purpose that dual safety is ensured.
Brief description of the drawings
Fig. 1 is the structural representation of invention preferred embodiment.
Fig. 2 is the left view schematic diagram of present pre-ferred embodiments.
Fig. 3 regards schematic diagram for the right side of present pre-ferred embodiments.
Fig. 4 is schematic top plan view of the back-up tong of present pre-ferred embodiments when pincers tooth is not fully closed.
Fig. 5 is clamping schematic top plan view when tooth is closed completely for the back-up tong of present pre-ferred embodiments.
Fig. 6 is the positioning of present pre-ferred embodiments and the structural representation of fastening system.
Fig. 7 is the positioning of present pre-ferred embodiments and the lock position view of fastening system.
Embodiment
Name preferred embodiment, and become apparent from intactly illustrating the present invention with reference to accompanying drawing.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6 and Fig. 7, a kind of hydraulic back-up tongs of vertical float positioning and locking,
It includes back-up tong 1, vertical float oil cylinder 7, the vertical float guiding assemblage 3 for being connected to back-up tong and is arranged in vertical float leading
To the back-up tong guide rail 2 of assembly, one end of vertical float oil cylinder 7 is connected to back-up tong guide rail 2, and the other end is connected to vertical float simultaneously
Guiding assemblage 3 and back-up tong 1.Vertical float guiding assemblage 3 and back-up tong 1 are affixed by bolt 4.
The top of vertical float guiding assemblage 3 is provided with first boss 15, and the top of back-up tong 1 is provided with second boss 16, hung down
The bottom of straight floating cylinder 7 is provided with ear mount 9, and ear mount 9 is fixed in first boss 15 and second boss 16 simultaneously.Ear mount and first
Connected between boss by bolt 10；Connected between ear mount and second boss by bolt 12.
Vertical float oil cylinder is two-stage telescopic cylinder.Connected between vertical float oil cylinder 7 and back-up tong guide rail 2 by bearing pin 8；
Connected between vertical float oil cylinder 7 and ear mount 9 by bearing pin 6.Back-up tong 1 can be driven when vertical float oil cylinder 7 is into and out of oil
Moved up and down with floating guiding assembly 3 along back-up tong guide rail 2, realize that jack up floating hydraulic back-up tongs exist by positioning and locking system 14
The fixation of any position and locked in stroke.
Back-up tong 1 includes housing 100, and housing is provided with through hole 101, and through hole 101 runs through the upper surface and lower surface of housing,
Provided with two pincers tooth assemblies in housing 100, tooth assembly 200 and pincers tooth assembly 300 are respectively clamped, pincers tooth assembly 200 and pincers tooth are total
It is distributed into 300 with the Central Symmetry of through hole 101.
Clamping tooth assembly 200 includes driving oil cylinder 201, pliers tooth base 202 and three pincers teeth 203, and pliers tooth base 202 is fixedly arranged on drive
The external part of dynamic oil cylinder 201, pincers tooth 203 is fixedly arranged on pliers tooth base.
Pliers tooth base 202 includes the center section part 204 and the edge part 205 located at the two ends of middle part 204 for placement pliers tooth,
Center section part is arc, and edge part is to diagonally distribute；Three pincers curved distributions of tooth 203.
Clamping tooth assembly 300 includes driving oil cylinder 301, pliers tooth base 302 and three pincers teeth 303, and pliers tooth base 302 is fixedly arranged on drive
The external part of dynamic oil cylinder 301, pincers tooth 303 is fixedly arranged on pliers tooth base.
Pliers tooth base 302 includes the center section part 304 and the edge part 305 located at the two ends of middle part 304 for placement pliers tooth,
Center section part is arc, and edge part is to diagonally distribute；Three pincers curved distributions of tooth 303.
Footwear 19 are led for funnel-form, footwear 19 and the insertion of through hole 101 are led provided with footwear 19 are led in the lower surface of housing 100.
Using double clip-on clamping forms of oil cylinder in back-up tong 1, when drilling rod or sleeve pipe via footwear 19 are led enter back-up tong 1
In, drilling rod or sleeve pipe are positioned in Ф 260mm through hole by a diameter of Ф 260mm footwear 19 of leading, driving oil cylinder 201 stretches out
End and the driving external part of oil cylinder 301 promote pliers tooth base 202, three pincers teeth 203 and pliers tooth base 302, three pincers teeth 303 to well respectively
Eye central axis movement, completes automatic centering and pinching action.
Pliers tooth base 202 and pliers tooth base 302 are respectively provided with three pincers teeth by structure optimization, while the both sides optimization of pliers tooth base
It is 260mm for distance between transition oblique angle, and every oblique angle of pliers tooth base two, it is equal with leading the diameter of footwear 19, moved to hole axis
During the drilling rod or sleeve pipe that can will be skewed towards in transition oblique angle side be centered in well central axis via transition oblique angle.
Three pincers teeth, and three pincers curved distributions of tooth are set, the external part and driving oil cylinder of oil cylinder 201 can driven
301 external part effectively clamps minor diameter bar when reaching the limit of position.
Provided with positioning and fastening system 14 between back-up tong guide rail 2 and vertical float guiding assemblage 3.Positioning and fastening system 14
Including for locking the slider-crank mechanism 400 of back-up tong guide rail and handle 143 for driving slider-crank mechanism 400.
The slider-crank mechanism 400 is including push handle 146, tooth block 149 after push handle 145, tooth block before tooth block and located at vertical floating
Before tooth block chute 148 on action-oriented assembly 3, tooth block after push handle 145 and tooth block between push handle 146, tooth block 149 and tooth block pusher
It is axle connection between handle 146；Tooth block 149 is slidedly arranged in tooth block chute 148；Handle 143 is fixedly arranged on push handle 145 before tooth block；The back of the body
Rack 142 is installed with pincers guide rail 2, rack 142 is secured by bolts in back-up tong guide rail 2, or rack 142 by being welded and fixed
In back-up tong guide rail 2.The teeth of tooth block 149 and the teeth of rack 142 are oppositely arranged；Branch is additionally provided with vertical float guiding assemblage 3
Frame 144, handle 143 is connected on support 144 by bearing pin 147.
When handle 143 around bearing pin 147 towards away from the movement of vertical float guiding assemblage direction when, tooth block 149 is towards leaving tooth
Slide in the direction of bar 142；When handle 143 is moved around bearing pin 147 towards the direction close to vertical float guiding assemblage, tooth block
149 slide towards the direction close to rack 142.When the end abutment of handle 143 is in vertical float guiding assemblage 3, tooth block 149 with
Rack 142 is meshed.
When back-up tong guide rail needs vertical float, handle is outwards pulled, and tooth block and rack are separated, and back-up tong guide rail can freely hang down
Translation is moved；When back-up tong guide rail moves vertically to specified location, push handle to inner side and reach crank block extreme position
Complete locking.
Vertical float guiding assemblage 3 is provided with the lock 1410 for being used for pinning handle.The limit dead point of slider-crank mechanism
Position is the operating position of this positioning and locking system, i.e., position when tooth block is engaged with rack.Handle is pulled to crank block
During dead-centre position, handle is just contacted with vertical float guiding assemblage side wall, then there is provided secondary safeguard protection by lock closure.
Tooth block chute 148 is welded in vertical float guiding assemblage 3, or tooth block chute 148 is shaped in vertical float
Guiding assemblage 3.Support 144 is welded in vertical float guiding assemblage 3, or support 144 is shaped in vertical float and is oriented to always
Into 3.So, respectively tooth block provides slideway, the swing for push handle before handle and tooth block and provides fulcrum.
The bottom of back-up tong guide rail 2 is provided with protection board 18, and protection board is fixed on back-up tong guide rail 2 by bolt 17.Will positioning with
The handle of fastening system is pulled outwardly, and is opened positioning and fastening system, back-up tong guide rail 2 is passed out of vertical float guiding assemblage 3.
It will position and the handle of fastening system push inner side to, back-up tong 1 is positioned and is locked, then be fixed on protection board 18 with bolt 17
The bottom of back-up tong guide rail 2, prevents positioning from causing back-up tong 1 to come off with the failure of fastening system 14.
The present invention reduces drill rod centering device compared with back-up tong is driven on top in the past, simplifies back-up tong structure, and vertical float row
Journey scope is bigger, meets the replacing demand of upper and lower inner blowout preventer and tap crossover sub, and can it is upper, unload it is automatic and
The quick positioning of any position is realized when manual inner blowout preventer is with tap crossover sub and locked, improve operating efficiency.
Compared with the positioning and locking mode that back-up tong was used in the past, positioning of the invention utilizes crank block machine with fastening system
The principle of structure engages rack with tooth block, simple in construction, and manufacturing cost is low, simple and convenient, can quickly realize positioning
With the requirement of locking.
The present invention uses the limit dead point mode (i.e. self-locking manner) of slider-crank mechanism and sets up outside for set lever
Lock, using safer, reaches the purpose of double shield.
Although the embodiment of the present invention is the foregoing described, it will be appreciated by those of skill in the art that this is only
For example, protection scope of the present invention is to be defined by the appended claims.Those skilled in the art without departing substantially from
On the premise of the principle and essence of the present invention, various changes or modifications can be made to these embodiments, but these changes and
Modification each falls within protection scope of the present invention.
Claims (10)
1. a kind of vertical float positioning and the hydraulic back-up tongs of locking, it includes back-up tong, vertical float oil cylinder, is connected to back-up tong
Vertical float guiding assemblage and be arranged in the back-up tong guide rail of vertical float guiding assemblage, one end of vertical float oil cylinder is connected to
Back-up tong guide rail, the other end is connected to vertical float guiding assemblage and back-up tong simultaneously；Characterized in that, back-up tong includes housing,
Housing is provided with through hole, and through hole runs through in the upper surface and lower surface of housing, housing provided with two pincers tooth assemblies, two pincers tooth assemblies
It is distributed with the Central Symmetry of through hole；Provided with positioning and fastening system between back-up tong guide rail and vertical float guiding assemblage；Positioning with
Fastening system includes the slider-crank mechanism for locking back-up tong guide rail and the handle for driving slider-crank mechanism；The crank
Slide block mechanism includes push handle, tooth block and the tooth block chute on vertical float guiding assemblage, tooth block after push handle, tooth block before tooth block
Between push handle it is axle connection after preceding push handle and tooth block between push handle, after tooth block and tooth block；Tooth block is slidedly arranged in tooth block chute；Hand
Handle is fixedly arranged on push handle before tooth block；Rack is installed with back-up tong guide rail, the teeth of tooth block and the teeth of rack are oppositely arranged.
2. vertical float positioning as claimed in claim 1 and the hydraulic back-up tongs of locking, it is characterised in that vertical float is oriented to total
Into support is above additionally provided with, handle is connected on support by bearing pin.
3. vertical float positioning as claimed in claim 1 and the hydraulic back-up tongs of locking, it is characterised in that vertical float is oriented to total
Into provided with the lock for being used to pin handle.
4. vertical float positioning as claimed in claim 1 and the hydraulic back-up tongs of locking, it is characterised in that tooth block chute is welded in
Vertical float guiding assemblage, or tooth block chute are shaped in vertical float guiding assemblage；Support is welded in vertical float and led
Vertical float guiding assemblage is shaped in assembly, or support；Rack is secured by bolts in back-up tong guide rail, or rack
By being fixedly welded on back-up tong guide rail.
5. vertical float positioning as claimed in claim 1 and the hydraulic back-up tongs of locking, it is characterised in that pincers tooth assembly includes driving
Dynamic oil cylinder, pliers tooth base and pincers tooth, pliers tooth base are fixedly arranged on the external part of driving oil cylinder, and pincers tooth is fixedly arranged on pliers tooth base.
6. vertical float positioning as claimed in claim 5 and the hydraulic back-up tongs of locking, it is characterised in that pliers tooth base includes being used for
The center section part of placement pliers tooth and the edge part located at middle part two ends, center section part are arc, and edge part is to diagonally distribute.
7. vertical float positioning as claimed in claim 6 and the hydraulic back-up tongs of locking, it is characterised in that pincers tooth assembly includes three
Individual pincers tooth, three pincers curved distributions of tooth.
8. vertical float positioning as claimed in claim 1 and the hydraulic back-up tongs of locking, it is characterised in that the lower surface of housing is set
Footwear are led, footwear is led for funnel-form, leads footwear and through hole insertion.
9. vertical float positioning as claimed in claim 1 and the hydraulic back-up tongs of locking, it is characterised in that vertical float is oriented to total
Into top be provided with first boss, the top of back-up tong is provided with second boss, and the bottom of vertical float oil cylinder is provided with ear mount, ear
Seat is fixed in first boss and second boss simultaneously.
10. vertical float positioning as claimed in claim 1 and the hydraulic back-up tongs of locking, it is characterised in that the bottom of back-up tong guide rail
Portion is provided with protection board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710347852.1A CN107100565A (en) | 2017-05-17 | 2017-05-17 | The hydraulic back-up tongs that vertical float is positioned and locked |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710347852.1A CN107100565A (en) | 2017-05-17 | 2017-05-17 | The hydraulic back-up tongs that vertical float is positioned and locked |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107100565A true CN107100565A (en) | 2017-08-29 |
Family
ID=59670407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710347852.1A Pending CN107100565A (en) | 2017-05-17 | 2017-05-17 | The hydraulic back-up tongs that vertical float is positioned and locked |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107100565A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108194031A (en) * | 2018-02-26 | 2018-06-22 | 四川宏华石油设备有限公司 | A kind of top drive guide rail |
| CN115045626A (en) * | 2022-06-08 | 2022-09-13 | 中国石油天然气集团有限公司 | Binding clip device and method for check valve of automatic pipe connecting drilling tool |
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| US20090272232A1 (en) * | 2008-05-01 | 2009-11-05 | Clint Musemeche | Dumbell Roller Assembly for Tong Unit |
| CN201687905U (en) * | 2010-03-02 | 2010-12-29 | 浙江泰普森休闲用品有限公司 | Rack lifting mechanism |
| CN202627996U (en) * | 2012-06-04 | 2012-12-26 | 江苏如石机械有限公司 | Bushing back-up tong |
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| CN106014196A (en) * | 2016-07-12 | 2016-10-12 | 河北永明地质工程机械有限公司 | Top drive drilling device |
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2017
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| US20090272232A1 (en) * | 2008-05-01 | 2009-11-05 | Clint Musemeche | Dumbell Roller Assembly for Tong Unit |
| CN201687905U (en) * | 2010-03-02 | 2010-12-29 | 浙江泰普森休闲用品有限公司 | Rack lifting mechanism |
| CN202627996U (en) * | 2012-06-04 | 2012-12-26 | 江苏如石机械有限公司 | Bushing back-up tong |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108194031A (en) * | 2018-02-26 | 2018-06-22 | 四川宏华石油设备有限公司 | A kind of top drive guide rail |
| CN108194031B (en) * | 2018-02-26 | 2024-05-24 | 四川宏华石油设备有限公司 | Top drive guide rail |
| CN115045626A (en) * | 2022-06-08 | 2022-09-13 | 中国石油天然气集团有限公司 | Binding clip device and method for check valve of automatic pipe connecting drilling tool |
| CN115045626B (en) * | 2022-06-08 | 2024-04-30 | 中国石油天然气集团有限公司 | Clamp head device and method for automatic preemptive connection of check valve of drilling tool |
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Application publication date: 20170829 |