CN107420051A - Automatic floating centering hydraulic clamp holder - Google Patents
Automatic floating centering hydraulic clamp holder Download PDFInfo
- Publication number
- CN107420051A CN107420051A CN201710318238.2A CN201710318238A CN107420051A CN 107420051 A CN107420051 A CN 107420051A CN 201710318238 A CN201710318238 A CN 201710318238A CN 107420051 A CN107420051 A CN 107420051A
- Authority
- CN
- China
- Prior art keywords
- clamp assemblies
- piston
- cylinder body
- centering
- end cap
- 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
- 238000007667 floating Methods 0.000 title claims abstract description 31
- 238000005553 drilling Methods 0.000 claims abstract description 37
- 230000005484 gravity Effects 0.000 claims abstract description 10
- 238000000429 assembly Methods 0.000 claims description 39
- 230000000712 assembly Effects 0.000 claims description 39
- 241000239290 Araneae Species 0.000 claims description 28
- 230000001737 promoting effect Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 230000003044 adaptive effect Effects 0.000 claims description 4
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 abstract description 8
- 238000010276 construction Methods 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000006467 substitution reaction 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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/10—Slips; Spiders ; Catching devices
-
- 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 an automatic floating centering hydraulic clamp holder which comprises a clamping component for clamping a drill rod and a base fixedly matched with a drilling machine frame and used for installing the clamping component; the clamping assembly is arranged on the base in a single-degree-of-freedom sliding mode along the radial swinging direction of the drill rod; a fixing elastic force for fixing the clamping assembly to prevent the clamping assembly from sliding under the action of gravity is arranged between the base and the clamping assembly along the single-degree-of-freedom sliding direction of the clamping assembly; external force floating centering can be increased, so that abrasion to the drill rod when the clamp holder is centered by using the force generated by the rotation of the drill rod is avoided; meanwhile, in the lateral-position drilling machine, the clamp holder can be centered under the action of floating external force, so that the problem of eccentricity of the existing clamp holder under the action of gravity is avoided, or the problem of centering in different directions is ensured by repeatedly adjusting the initial position of the clamp holder to ensure centering.
Description
Technical field
The present invention relates to drilling tool field, and in particular to a kind of automatic floating centering hydraulic gripper.
Background technology
Clamper is one of critical component in hydraulic drill rig, and the quality of its structure directly affects the clamping of drilling rod, opened
Function and the abrasion for causing drilling rod.Existing clamper is mainly normally closed type floating hydraulic gripper, and drilling rod is realized using disc spring
Clamping, realize drilling rod with clamper centering with the flying height of mounting seat using clamper seat, major defect be open and
In clamping process, the floating of drilling rod, which is moved, to be realized to the active force of slips in being rotated using drilling rod, so as to reach the mesh of " centering "
, it is to ensure that drilling rod does not continue to contact with drilling rod after opening in fact.The centering for being mainly shown as clamper is rotated by drilling rod
Apply active force, abrasion can be produced to drilling rod all the time, in particularly comprehensive rig, clamper can not produce under gravity
Capture is moved, and after clamper is opened, clamper contacts with drilling rod always, increases drill rod abrasion.
Therefore, it is to solve problem above, it is necessary to a kind of automatic floating centering hydraulic gripper, by increasing capacitance it is possible to increase external force floating
Centering, abrasion when rotating generation power using drilling rod to ensure the centering of clamper so as to avoid to drilling rod；Simultaneously in side
In the rig of position, clamper also can avoid existing clamper under gravity inclined in the presence of floating external force in
Heart problem or to ensure the adjustment clamper initial position that repeats of centering to ensure centering problem in different azimuth.
The content of the invention
In view of this, the purpose of the present invention is the defects of overcoming in the prior art, there is provided automatic floating centering hydraulic clamping
Device, by increasing capacitance it is possible to increase external force floating centering, so as to avoid rotated using drilling rod produce power to ensure the centering of clamper when pair
The abrasion of drilling rod；Simultaneously in side coil rig, clamper also can avoid existing folder in the presence of floating external force in
Holder eccentricity issues under gravity or to ensure adjustment clamper initial position that centering repeats to ensure difference
Centering problem in orientation.
The automatic floating centering hydraulic gripper of the present invention, including clamp assemblies and and borer frame for holding drill pipe
Secure fit and the base for installing clamp assemblies；The clamp assemblies are radially wobbled direction along drilling rod and slided with single-degree-of-freedom
Mode be installed on base.
Further, it is provided between the base and clamp assemblies along the single-degree-of-freedom glide direction of clamp assemblies for solid
Determine the fixation elastic force that clamp assemblies avoid clamp assemblies from sliding under gravity.
Further, the fixed elastic force includes being used for promoting the left elastic force of clamp assemblies to the left and for promoting clamping to the right
The right elastic force of component, the left and right elastic force is respectively by two along the symmetrically arranged left and right column spring of clamp assemblies glide direction
There is provided.
Further, the clamp assemblies include connecting rod and by left end cap of the left-to-right fixed jacket successively in connecting rod, left cylinders
Body, left slip spider, right slip spider, right cylinder body and right end cap；The left and right cylinder body, which corresponds, to be separately provided for back and forth pushing away
The left and right piston component of left and right slip spider is moved, the left and right slip spider bottom is slided by T-slot with base single-degree-of-freedom matches somebody with somebody
Close；The left and right end cap be provided with for left and right in cylinder body outer space oiling clamping oil inlet, left and right cylinder body is equal
Be provided with for left and right in cylinder body inner space oiling release oil inlet.
Further, the centre of the connecting rod is provided with for spacing respectively to left and right slip spider and realize the centering of centering
Step, the centering step left side move right for limiting left slip spider, are used to limit right slips on the right side of the centering step
Seat is moved to the left.
Further, it is described to lead in addition in left-right direction through the guide rod for sequentially passing through left end cap, base and right end cap
Locking nut is provided with to the both ends difference thread jacket of bar, the left and right column spring is coated at the both sides of guide rod simultaneously respectively
The fixed elastic force is provided.
Further, the left and right end cap inner face forms the convex for being placed on left and right cylinder body in sealing respectively to inner process
Set, the left and right piston component include include sealed set in the piston only in cylinder body, be connected to piston only and slips
Piston rod between seat and the fastening spring for promoting piston only to make slip spider be in normally off, outside the piston only
It is common in the lead in convex set, the equal indent of inner face and lead of the end cap to form inner seal sleeve for evagination among end face
Form the column installing space for installing fastening spring.
Further, the inner face of the piston only convexes to form sealing and passes the piston rod of cylinder body, in the piston rod
Sunken end face forms mounting groove, and the outer end insertion mounting groove of a contiguous block is simultaneously fixedly connected with piston rod, and the inner is dovetail agllutination
The dovetail groove that structure and adaptive insertion are arranged in corresponding slip spider realizes drive connection.
Further, the left and right cylinder body is cylindrical is fixedly installed the left and right contiguous block for being coated at connecting rod, the connecting rod
Both ends form axle journal, left end cap is coated at two axle journals and by being arranged at respectively with left contiguous block and right end cap with right contiguous block
The locking nut of journal outer end is axially fixed at connecting rod along connecting rod.
Further, the connecting rod is for four and arranged in parallel.
The beneficial effects of the invention are as follows：
(1) automatic centering, former single group piston is divided into two groups of pistons, positioned by connecting rod intermediate step, realized and bore
Bar automatic centering, eliminate the abrasion that drilling rod (drilling, is assembled and disassembled) at work；Clamping slips synchronization automatic centering steps up and synchronization
Automatic centering is opened, and practical reliable, drilling speed is fast；
(2) floating centering, realizes the uniform clamping of drilling rod, while avoids to vibrate in drilling process and drilling rod is hit
Hit；
(3) in side coil rig, clamper also can avoid existing clamper in the presence of floating external force in
Eccentricity issues under gravity or to ensure adjustment clamper initial position that centering repeats to ensure different azimuth
Middle centering problem.
(4) it is compact-sized, the space of piston solid section is made full use of, disc spring is replaced using spring, effectively make use of
Space；In comprehensive rig, spring floating can be avoided to eliminate shock of the free floating to drilling rod；
(5) simple in construction, small volume is in light weight, easy to operate, securely and reliably, for ease of maintenaince；The normally closed performance of clamper
When avoiding elevation bore, brill accident is run when rig powers off suddenly.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and examples：
Fig. 1 is the structural representation of the present invention.
Embodiment
Fig. 1 is the structural representation of the present invention, as illustrated, the automatic floating centering hydraulic gripper in the present embodiment；
Including the clamp assemblies for holding drill pipe and with borer frame secure fit and for installing the bases 1 of clamp assemblies；It is described
Clamp assemblies along drilling rod radially wobble direction by single-degree-of-freedom slide in a manner of be installed on base 1；By the way that clamp assemblies edge is bored
Bar radially wobbles direction and is slidably mounted on base 1 with single-degree-of-freedom, can realize that the holding holes of clamp assemblies and drilling rod are automatically right
In, i.e. realize the uniform clamping of drilling rod.
In the present embodiment, it is provided between the base 1 and clamp assemblies along the single-degree-of-freedom glide direction of clamp assemblies
The fixation elastic force that clamp assemblies slide under gravity is avoided for fixed clamp component；I.e. fixed elastic force is set relatively
Greatly, it is far longer than the gravity of clamp assemblies, in comprehensive rig, after clamper rotates (non-standard state), due to fixation
The effect of elastic force avoids the holding holes of clamp assemblies from sliding and cause clamp assemblies to be contacted when opening with drilling rod, effectively avoids
The shock of vibration (or swing) to drilling rod in drilling process, while avoid rubbing, ensure service life length.
In the present embodiment, the fixed elastic force includes being used for promoting the left elastic force of clamp assemblies to the left and for promoting to the right
The right elastic force of clamp assemblies, the left and right elastic force is respectively by two along the symmetrically arranged left and right column of clamp assemblies glide direction
Spring (including left column spring 2 and right column spring 3) provides；The fixed elastic force is provided by column spring, it is simple in construction,
It can ensure clamp assemblies floating centering by choosing the left and right column spring of identical.
In the present embodiment, the clamp assemblies include connecting rod 4 and by left-to-right fixed jacket successively in the left end cap of connecting rod 4
5th, left cylinder 6, left slip spider 7, right slip spider 8, right cylinder body 9 and right end cap 10；The left and right cylinder body 9 corresponds to be set respectively
The left and right piston component for back and forth promoting left and right slip spider is equipped with, the left and right slip spider bottom passes through T-slot and base
1 single-degree-of-freedom is slidably matched；As illustrated, the top surface of base 1 forms T-slot, and the bottom of left and right slip spider 8 is respectively formed and T-slot
The T-shaped slippery fellow that adaptive coordinates；The left and right end cap is provided with for the clamping of outer space oiling to be entered in cylinder body to left and right
Hydraulic fluid port (including it is left clamping oil inlet 11 and it is right clamping oil inlet 12), left and right cylinder body be provided with for left and right in cylinder body in
The release oil inlet (including left release oil inlet 13 and right release oil inlet 14) of side space oiling, certainly, the both ends point of connecting rod 4
Not being provided with locking nut makes clamp assemblies be an entirety；Inner side represents along connecting rod 4 axially adjacent to slips side, otherwise is outer
Side.
In the present embodiment, the centre of the connecting rod 4 is provided with for spacing respectively to left and right slip spider and realize centering
Centering step 15, the left side of centering step 15 move right for limiting left slip spider 7, and the right side of centering step 15 is used for
Right slip spider 8 is limited to be moved to the left；Former single group piston is divided into two groups of pistons, by setting centering step among connecting rod 4
15 are positioned, and realize drilling rod automatic centering, eliminate the abrasion that drilling rod (drilling, is assembled and disassembled) at work；It is synchronous to clamp slips
Automatic centering is clamped and synchronous automatic centering is opened, and practical reliable, drilling speed is fast.
In the present embodiment, in addition in left-right direction through the guide rod for sequentially passing through left end cap, base 1 and right end cap 10
16, the both ends difference thread jacket of the guide rod 16 is provided with locking nut, and the left and right column spring is coated at guiding respectively
The both sides of bar 16 simultaneously provide the fixed elastic force；Left and right column spring the inner presses on two lateral surfaces of base 1 respectively, left and right
Column spring outer end presses on the medial surface of two end cap, simple in construction, stably, easy for installation；Certain guide rod 16 and column bullet
Spring can be set multiple, ensure that fixed elastic force is larger, beneficial to stable；Left and right directions represents slip side of the clamp assemblies relative to base
To.
In the present embodiment, the left and right end cap inner face forms to inner process and is placed on left and right cylinder body in sealing respectively
Convex set (including left inside convex set 17 and right convex set 18), the left and right piston component includes including sealed set in cylinder body
Interior piston only (including left piston body 19 and right piston body 20), the piston being connected between piston only and slip spider
Bar and fastening spring (including left fastening spring 21 and right clamping bullet for promoting piston only slip spider is in normally off
Spring 22), piston only outer face centre evagination forms inner seal sleeve in the lead in convex set, the inner of the end cap
Face and the equal indent of lead are collectively forming the column installing space for installing fastening spring；It is compact-sized, make full use of piston
The space of solid section, disc spring is replaced using spring, effectively make use of space.
In the present embodiment, the inner face of the piston only convexes to form the piston rod 23 that sealing passes cylinder body, the work
Stopper rod inner face is recessed to form mounting groove, and the outer end insertion mounting groove of a contiguous block is simultaneously fixedly connected with piston rod, and the inner is swallow
The dovetail groove that tail block structure and adaptive insertion are arranged in corresponding slip spider realizes drive connection；Drive it is smooth, it is easy for installation.
In the present embodiment, the left and right cylinder body 9 is cylindrical to be fixedly installed the left and right contiguous block for being coated at connecting rod 4, institute
The both ends for stating connecting rod 4 form axle journal 24, and left end cap 5 is coated at two axle journals respectively with left contiguous block and right end cap 10 with right contiguous block
And the locking nut by being arranged at journal outer end is axially fixed at connecting rod 4 along connecting rod 4；It is simple in construction, it is convenient to mount and dismount, beneficial to inspection
Repair.
In the present embodiment, the connecting rod 4 is for four and arranged in parallel；Ensure the stability of clamp assemblies, ensure card
The stability of watt clamping is high.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although with reference to compared with
The present invention is described in detail good embodiment, it will be understood by those within the art that, can be to the skill of the present invention
Art scheme is modified or equivalent substitution, and without departing from the objective and scope of technical solution of the present invention, it all should cover at this
Among the right of invention.
Claims (10)
- A kind of 1. automatic floating centering hydraulic gripper, it is characterised in that：Including the clamp assemblies for holding drill pipe and with brill Machine frame secure fit and the base for installing clamp assemblies；The clamp assemblies radially wobble direction with single freedom along drilling rod The mode that degree slides is installed on base.
- 2. automatic floating centering hydraulic gripper according to claim 1, it is characterised in that：The base and clamp assemblies Between be provided with along the single-degree-of-freedom glide direction of clamp assemblies and avoid clamp assemblies in Action of Gravity Field for fixed clamp component The fixation elastic force of lower slider.
- 3. automatic floating centering hydraulic gripper according to claim 2, it is characterised in that：The fixed elastic force includes using In promoting the left elastic force of clamp assemblies and right elastic force for promoting clamp assemblies to the right to the left, the left and right elastic force respectively by Two provide along the symmetrically arranged left and right column spring of clamp assemblies glide direction.
- 4. automatic floating centering hydraulic gripper according to claim 3, it is characterised in that：The clamp assemblies include connecting Bar and by left-to-right fixed jacket successively in the left end cap of connecting rod, left cylinder, left slip spider, right slip spider, right cylinder body and right-hand member Lid；The left and right cylinder body corresponds the left and right piston component for being separately provided for back and forth promoting left and right slip spider, described Left and right slip spider bottom is slidably matched by T-slot and base single-degree-of-freedom；The left and right end cap be provided with for the left, The clamping oil inlet of outer space oiling in right cylinder body, left and right cylinder body are provided with for inner space to be noted in cylinder body to left and right The release oil inlet of oil.
- 5. automatic floating centering hydraulic gripper according to claim 4, it is characterised in that：Setting among the connecting rod Have and be used to limit left card for centering step that is spacing respectively to left and right slip spider and realizing centering, the centering step left side Watt seat moves right, and is used to limiting right slip spider on the right side of the centering step and is moved to the left.
- 6. automatic floating centering hydraulic gripper according to claim 4, it is characterised in that：Also include passing through in left-right direction The guide rod for sequentially passing through left end cap, base and right end cap is worn, the both ends difference thread jacket of the guide rod is provided with locking screw Mother, the left and right column spring are coated at the both sides of guide rod and provide the fixed elastic force respectively.
- 7. automatic floating centering hydraulic gripper according to claim 4, it is characterised in that：The left and right end cap is inner Face forms the convex set for being placed on left and right cylinder body in sealing respectively to inner process, and the left and right piston component is included including close Seal the piston only being arranged in cylinder body, the piston rod being connected between piston only and slip spider and for promoting piston only Slip spider is set to be in the fastening spring of normally off, evagination forms inner seal sleeve in convex set among the piston only outer face Interior lead, the column that the equal indent of inner face and lead of the end cap is collectively forming for installing fastening spring install sky Between.
- 8. automatic floating centering hydraulic gripper according to claim 7, it is characterised in that：The inner of the piston only Face convexes to form the piston rod that sealing passes cylinder body, and the piston rod inner face is recessed to form mounting groove, the outer end of a contiguous block Embedded mounting groove is simultaneously fixedly connected with piston rod, and the inner is embedded in the swallow being arranged in corresponding slip spider for dovetail block structure and adaptive Stern notch realizes drive connection.
- 9. automatic floating centering hydraulic gripper according to claim 4, it is characterised in that：The left and right cylinder body is cylindrical Be fixedly installed the left and right contiguous block for being coated at connecting rod, the both ends of the connecting rod form axle journal, left end cap and left contiguous block and Right end cap and right contiguous block are coated at two axle journals and by being arranged at the locking nut of journal outer end along connecting rod axial restraint respectively In connecting rod.
- 10. automatic floating centering hydraulic gripper according to claim 4, it is characterised in that：The connecting rod be four simultaneously It is arranged in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710318238.2A CN107420051A (en) | 2017-05-08 | 2017-05-08 | Automatic floating centering hydraulic clamp holder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710318238.2A CN107420051A (en) | 2017-05-08 | 2017-05-08 | Automatic floating centering hydraulic clamp holder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107420051A true CN107420051A (en) | 2017-12-01 |
Family
ID=60425839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710318238.2A Pending CN107420051A (en) | 2017-05-08 | 2017-05-08 | Automatic floating centering hydraulic clamp holder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107420051A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108222864A (en) * | 2018-02-13 | 2018-06-29 | 北京新能正源环境科技有限公司 | Drilling rod mechanism for assembling-disassembling |
| CN108626211A (en) * | 2018-04-13 | 2018-10-09 | 宜昌长机科技有限责任公司 | A kind of optical axis retaining mechanism and operating method |
| CN109025855A (en) * | 2018-08-03 | 2018-12-18 | 四川诺克钻探机械有限公司 | A kind of magnetic control drill rod grip device |
| CN109826574A (en) * | 2019-04-16 | 2019-05-31 | 克拉玛依市建业能源股份有限公司 | Light maintenance workover rig integrated operation system |
| CN110370016A (en) * | 2019-08-07 | 2019-10-25 | 绵阳飞腾精密机械科技有限公司 | Mold assembles adaptive suspension centralising device |
| CN110939388A (en) * | 2019-12-13 | 2020-03-31 | 遵义师范学院 | High-precision drilling anti-deviation device for geotechnical engineering survey |
| CN111486812A (en) * | 2020-03-26 | 2020-08-04 | 中船澄西船舶修造有限公司 | Hydraulic nut trial assembly tool |
| CN112554815A (en) * | 2020-12-09 | 2021-03-26 | 江苏徐工工程机械研究院有限公司 | Clamp and clamp holder |
| CN112664717A (en) * | 2020-11-17 | 2021-04-16 | 武汉船舶设计研究院有限公司 | Centre gripping angle compensation arrangement suitable for deep sea mining |
| CN113696157A (en) * | 2021-09-09 | 2021-11-26 | 红云红河烟草(集团)有限责任公司 | Movable clamping device for pipeline joint |
| CN114700382A (en) * | 2022-03-09 | 2022-07-05 | 江苏海川光电新材料有限公司 | Metal draws fender oiled-plate clamping tool a little |
| CN116877046A (en) * | 2023-08-21 | 2023-10-13 | 石家庄博安煤矿机械制造有限公司 | Drill rod holder with fault detection function and fault detection method |
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| CN108222864A (en) * | 2018-02-13 | 2018-06-29 | 北京新能正源环境科技有限公司 | Drilling rod mechanism for assembling-disassembling |
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Inventor after: Ruan Shaogang Inventor after: Chen Long Inventor after: Wang Zhijin Inventor after: Chen Yan Inventor after: Zheng Zhulin Inventor after: Li Xuezhong Inventor after: Zhang Ling Inventor after: Jiang Kaiyong Inventor after: Ma Zhengang Inventor after: Chen Hang Inventor after: Tian Leyi Inventor after: Du Yuzhou Inventor after: Qiu Xianglin Inventor before: Ruan Shaogang Inventor before: Chen Long Inventor before: Wang Zhijin Inventor before: Chen Yan Inventor before: Zheng Zhulin Inventor before: Li Xuezhong Inventor before: Zhang Ling Inventor before: Jiang Kaiyong Inventor before: Ma Zhengang Inventor before: Chen Hang Inventor before: Tian Leyi Inventor before: Du Yuzhou Inventor before: Qiu Xianglin |
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Application publication date: 20171201 |