CN111021941B - Soft rock small-bore diameter deep hole pore-forming equipment - Google Patents
Soft rock small-bore diameter deep hole pore-forming equipment Download PDFInfo
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- CN111021941B CN111021941B CN202010001656.0A CN202010001656A CN111021941B CN 111021941 B CN111021941 B CN 111021941B CN 202010001656 A CN202010001656 A CN 202010001656A CN 111021941 B CN111021941 B CN 111021941B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B3/00—Rotary drilling
- E21B3/02—Surface drives for rotary drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a soft rock small-aperture deep hole forming device, and particularly relates to the field of tunnel construction and underground engineering construction, wherein the soft rock small-aperture deep hole forming device comprises a drilling machine, the output end of the drilling machine is in transmission connection with a main drill rod, one end of the main drill rod is provided with a drill bit, a connecting sleeve is arranged between the main drill rod and the drill bit, and the main drill rod and the drill bit are fixedly connected through the connecting sleeve; and a connecting drill rod can be arranged between the main drill rod and the drill bit, and the main drill rod and the connecting drill rod as well as the connecting drill rod and the drill bit are fixedly connected through connecting sleeves. The invention provides drilling power by adopting the YT-28 air-leg rock drill, can provide torque meeting the drilling requirement, can arrange a plurality of rock drills in a limited working space to drill simultaneously, improves the construction efficiency, can randomly adjust the hole position and the drilling direction, and has higher drilling speed under the condition of soft rock by adopting the diamond composite sheet anchor rod drill bit compared with the conventional straight drill bit or cross drill bit.
Description
Technical Field
The invention relates to the field of tunnel construction and underground engineering construction, in particular to a small-aperture deep-hole forming device for soft rock.
Background
In the soft rock tunnel construction, the drilling speed has great influence on the construction progress, and therefore, the type selection and the optimized combination of the drilling machine, the drill rod, the drill bit and other matched equipment have great significance. At present, a three-arm rock drilling trolley, a C6 drilling machine, a roofbolter and the like are adopted for drilling holes in domestic tunnel construction, but the tunnel construction is limited by operation space, large machines are small in number of simultaneously drilled holes, the drilling direction is difficult to control, the drilling depth of a common YT-28 drilling machine is shallow, horizontal drilling holes of the mining roofbolter are not suitable for discharging slag, and the mining roofbolter is difficult to be suitable for forming small-aperture deep holes under the condition of soft rock.
Disclosure of Invention
In order to overcome the defects in the prior art, the embodiment of the invention provides the soft rock small-aperture deep hole forming equipment, the YT-28 air-leg rock drill is adopted to provide drilling power, so that not only can the torque meeting the drilling requirement be provided, but also a plurality of rock drills can be arranged in a limited working space for drilling simultaneously, the construction efficiency is improved, the hole position and the drilling direction can be adjusted randomly compared with a conventional mining drilling machine, and meanwhile, compared with a conventional straight-shaped drill bit or a conventional cross-shaped drill bit, the adopted diamond composite sheet anchor rod drill bit has higher drilling speed under the soft rock condition, so that the problems in the background technology are solved.
In order to achieve the purpose, the invention provides the following technical scheme: the soft rock small-aperture deep hole forming equipment comprises a drilling machine, wherein the output end of the drilling machine is in transmission connection with a main drill rod, one end of the main drill rod is provided with a drill bit, a connecting sleeve is arranged between the main drill rod and the drill bit, and the main drill rod and the drill bit are fixedly connected through the connecting sleeve;
a connecting drill rod can be arranged between the main drill rod and the drill bit, and the main drill rod and the connecting drill rod as well as the connecting drill rod and the drill bit are fixedly connected through connecting sleeves;
the drilling machine is an YT-28 air-leg rock drill;
the main drill rod and the connecting drill rod are both hexagonal drill rods;
the drill bit is a diamond compact anchor head drill rod.
In a preferred embodiment, first flanges are welded at one end of the main drill rod far away from the drilling machine, at one end of the drill bit close to the drilling machine and at two ends of the connecting drill rod, and second flanges are welded at two ends of the connecting sleeve.
In a preferred embodiment, the diameters of the first flange and the second flange are equal, through holes are uniformly distributed in the end face edge positions of the first flange and the second flange in an annular shape, and the through holes on the first flange and the through holes on the second flange are arranged in a one-to-one correspondence manner.
In a preferred embodiment, a blind nut is welded at a position corresponding to the through hole on one side of the second flange far away from the first flange, an embedding groove is arranged at a position corresponding to the through hole on one side of the first flange far away from the second flange, and the diameter of the embedding groove is larger than that of the through hole.
In a preferred embodiment, a screw rod penetrates through the through hole, the outer peripheral surface of the screw rod is attached to the inner peripheral surface of the through hole, a limiting plate is fixedly connected to one end of the screw rod close to the caulking groove, and one end of the screw rod close to the blind nut is in threaded connection with the blind nut.
In a preferred embodiment, the limit plate is nested inside the caulking groove, and the end of the limit plate away from the caulking groove is dared with a knob.
In a preferred embodiment, a connector is fixedly arranged at one end, close to the connecting sleeve, of the first flange, the length of the connector is one half of the length of the connecting sleeve, one end, far away from the first flange, of the connector is arranged inside the connecting sleeve and is in threaded connection with the inner peripheral surface of the connecting sleeve, and a plurality of stop bars are uniformly distributed on the outer peripheral surface of the connecting sleeve in an annular shape.
In a preferred embodiment, the end face edge positions of the first flange and the second flange are provided with calibration slots in a penetrating manner.
In a preferred embodiment, the drill bit has a diameter of 28-50mm, the main and jointed drill rods are B19 or B22 drill rods, and the length of the main and jointed drill rods is 5 m.
In a preferred embodiment, the environment is soft rock with Rc < 30MPa, the pore-forming depth is 10-15m, and the pore-forming pore diameter is 28-50 mm.
The invention has the technical effects and advantages that:
1. according to the invention, the YT-28 air-leg rock drill is adopted to provide drilling power, so that not only can torque meeting the drilling requirement be provided, but also a plurality of rock drills can be arranged in a limited working space to drill simultaneously, and the construction efficiency is improved;
2. according to the invention, the YT-28 air-leg rock drill is adopted to provide drilling power, so that the hole position and the drilling direction can be adjusted at will compared with a conventional mining drilling machine;
3. compared with a conventional straight drill bit or a cross drill bit, the diamond compact anchor rod drill bit has higher drilling speed under the condition of soft rock;
4. the invention breaks through the hole forming depth of the conventional YT-28 air-leg rock drill by adopting the connecting and sleeving long drill rod, adopts a lengthening mode instead of a whole long drill rod, and avoids overlarge deflection of the drill rod at the initial drilling stage;
5. according to the invention, a single drill rod with the length of 5m is adopted, and the drill rod can be prevented from being frequently lengthened compared with the drill rod with the length of 1-2m, so that the drilling efficiency is improved;
6. according to the invention, the screw rod is screwed into the blind hole nut, and the first flange and the second flange are connected and fixed, so that secondary reinforcement is realized on the connecting sleeve and the drill bit and the main drill rod at the corresponding positions, the main drill rod and the connecting drill rod or the connecting drill rod and the drill bit, and the working stability of the drill rod in the drilling process is greatly improved.
Drawings
Fig. 1 is a schematic view of the initial drilling configuration of the present invention.
Fig. 2 is a schematic diagram of the final drilling configuration of the present invention.
FIG. 3 is an enlarged view of the portion A of FIG. 2 according to the present invention.
FIG. 4 is an enlarged view of the portion B of FIG. 1 according to the present invention.
Fig. 5 is a partial structural schematic diagram of the connecting sleeve of the invention.
Fig. 6 is a schematic structural view of a first flange of the present invention.
The reference signs are: the drilling machine comprises a drilling machine 1, a main drilling rod 2, a drill bit 3, a connecting sleeve 4, a connecting drilling rod 5, a first flange 6, a second flange 7, a blind hole nut 8, a screw rod 9, a through hole 10, an embedding groove 11, a limiting plate 12, a stop strip 13, a calibration groove 14, a connector 15 and a knob 16.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-2 and fig. 5-6, the invention provides a soft rock small-aperture deep hole forming device, which comprises a drilling machine 1, wherein the output end of the drilling machine 1 is in transmission connection with a main drill rod 2, one end of the main drill rod 2 is provided with a drill bit 3, a connecting sleeve 4 is arranged between the main drill rod 2 and the drill bit 3, and the main drill rod 2 and the drill bit 3 are fixedly connected through the connecting sleeve 4;
a connecting drill rod 5 can be arranged between the main drill rod 2 and the drill bit 3, and the main drill rod 2 and the connecting drill rod 5 as well as the connecting drill rod 5 and the drill bit 3 are fixedly connected through connecting sleeves 4;
the drilling machine 1 is an YT-28 air-leg rock drill and is used for providing drilling power;
the main drill rod 2 and the connecting drill rod 5 are both hexagonal drill rods;
the drill bit 3 is a diamond composite sheet anchor head drill rod and can well and quickly drill to form a hole under the condition of soft rock;
a connector 15 is fixedly arranged at one end, close to the connecting sleeve 4, of the first flange 6, the length of the connector 15 is half of that of the connecting sleeve 4, one end, far away from the first flange 6, of the connector 15 is arranged inside the connecting sleeve 4 and is in threaded connection with the inner peripheral surface of the connecting sleeve 4, and the main drill rod 2, the connecting drill rod 5 and the drill bit 3 can be conveniently and quickly assembled and disassembled;
the diameter of the drill bit 3 is 28-50mm, the main drill rod 2 and the connecting drill rod 5 are B19 or B22 drill rods, and the lengths of the main drill rod 2 and the connecting drill rod 5 are 5 m;
the soft rock small-aperture deep-hole forming equipment is applicable to soft rock with Rc less than 30MPa, the hole forming depth is 10-15m, and the hole forming aperture is 28-50 mm.
The implementation mode is specifically as follows: in practical use, one end of the main drill rod 2 is assembled with the drilling machine 1, then one end of the main drill rod 2, which is far away from the drilling machine 1, is connected with the drill bit 3 through the connecting sleeve 4, because one end of the main drill rod 2, which is far away from the drilling machine 1, one end of the drill bit 3, which is near to the drilling machine 1, and two ends of the connecting drill rod 5 are both welded with the first flanges 6, one end of the first flange 6, which is near to the connecting sleeve 4, is fixedly provided with the connecting head 15, and two ends of the connecting sleeve 4 are both welded with the second flanges 7, in the connecting process, the main drill rod 2 and the connecting head 15 at the end part of the first flange 6 on the drill bit 3 are only required to be inserted into the connecting sleeve 4 to be in threaded connection with the connecting sleeve 4, so as to complete the assembly between the main drill rod 2 and the drill bit 3, then the drilling, utilize adapter sleeve 4 to connect drilling rod 5, analogize by so on, until drilling finishes, this embodiment has specifically solved drilling equipment among the prior art and has been difficult to be applicable to the small aperture deep hole pore-forming problem under the soft rock condition.
As shown in fig. 1-6, in the soft rock small-aperture deep-hole forming device, the diameters of the first flange 6 and the second flange 7 are equal, through holes 10 are uniformly distributed in the end face edge positions of the first flange 6 and the second flange 7 in an annular shape, and the through holes 10 on the first flange 6 and the second flange 7 are arranged in a one-to-one correspondence manner;
a blind nut 8 is welded at a position, corresponding to the through hole 10, of one side, far away from the first flange 6, of the second flange 7, an embedded groove 11 is formed at a position, corresponding to the through hole 10, of one side, far away from the second flange 7, of the first flange 6, and the diameter of the embedded groove 11 is larger than that of the through hole 10;
a screw 9 penetrates through the through hole 10, the outer peripheral surface of the screw 9 is attached to the inner peripheral surface of the through hole 10, one end of the screw 9, which is close to the caulking groove 11, is fixedly connected with a limiting plate 12, and one end, which is close to the blind nut 8, is in threaded connection with the blind nut 8;
the limiting plate 12 is nested in the caulking groove 11, and one end of the limiting plate 12, which is far away from the caulking groove 11, is connected with the knob 16, so that the situation that the main drill rod 2 and the drill rod 5 are connected with the drill bit 3 in the process of dismounting and mounting can be avoided, and the operation by means of tools is convenient and rapid;
a plurality of baffle strips 13 are uniformly distributed on the outer peripheral surface of the connecting sleeve 4 in an annular manner, so that the connecting sleeve 4 can be conveniently screwed without a tool, and the connecting sleeve can be prevented from slipping in the screwing process;
the end face edge positions of the first flange 6 and the second flange 7 are both provided with a calibration groove 14 in a penetrating manner, so that after the connector 15 is screwed in place, the through holes 10 on the first flange 6 and the second flange 7 are just correspondingly communicated, and the insertion of the screw rod 9 is facilitated;
the implementation mode is specifically as follows: in the process of connecting the main drill rod 2 and the connecting drill rod 5, and connecting the drill rod 5 and the drill bit 3, or connecting the main drill rod 2 and the drill bit 3 by using the connecting sleeve 4, firstly, the calibrating groove 14 on the edges of the first flange 6 and the second flange 7 at the corresponding positions is provided, then the connector 15 at the end part of the first flange 6 is screwed into the connecting sleeve 4, when the connector 15 is screwed in place, the first flange 6 is correspondingly communicated with the through hole 10 on the second flange 7, then, the screw 9 at the end part of the limiting plate 12 is inserted from the through hole 10 at the side of the first flange 6 far from the second flange 7, then the knob 16 is screwed, and one end of the screw 9 far from the limiting plate 12 is screwed into the blind nut 8, so as to realize the secondary reinforcement of the connecting sleeve 4 and the drill bit 3 and the main drill rod 2 at the corresponding positions, the main drill rod 2 and the connecting drill rod 5, or the connecting drill rod 5 and the drill bit 3, the connection between the drill bit 3, the connector drill rod 5 and the main drill rod 2 is not firm, which results in a problem of drilling failure.
The working principle of the invention is as follows:
referring to the attached drawings 1-6 of the specification, in the practical use process, the main drill rod 2 can be firstly connected with the output end of the drilling machine 1 through the connecting sleeve 4, the drill bit 3 is connected to the main drill rod 2, then the drilling machine 1 is started to carry out the drilling operation, when the drilling is carried out until the drill rod is remained for 30-50cm, the connecting sleeve 4 is used for connecting the drill rod 5, and the like, the damage to the drill rod caused by the overlarge deflection of the drill rod at the initial stage of drilling can be avoided until the drilling is finished, and when the connecting sleeve 4 is used for connecting the drill bit 3 and the main drill rod 2 or the drill bit 3 and the connecting drill rod 5 and the main drill rod 2, the first flange 6 and the second flange 7 are connected and fixed by screwing the screw rod 9 into the blind nut 8, so as to realize the secondary reinforcement of the connecting sleeve 4 and the drill bit 3 and the main drill rod 2 at the corresponding positions, the stability of drilling rod work in the drilling process has been improved greatly.
The points to be finally explained are: first, in the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may be a mechanical connection or an electrical connection, or a communication between two elements, and may be a direct connection, and "upper," "lower," "left," and "right" are only used to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed;
secondly, the method comprises the following steps: in the drawings of the disclosed embodiments of the invention, only the structures related to the disclosed embodiments are referred to, other structures can refer to common designs, and the same embodiment and different embodiments of the invention can be combined with each other without conflict;
and finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (8)
1. The utility model provides a soft rock small bore diameter deep hole pore-forming equipment, includes rig (1), its characterized in that: the output end of the drilling machine (1) is in transmission connection with a main drill rod (2), one end of the main drill rod (2) is provided with a drill bit (3), a connecting sleeve (4) is arranged between the main drill rod (2) and the drill bit (3), and the main drill rod (2) and the drill bit (3) are fixedly connected through the connecting sleeve (4);
a connecting drill rod (5) can be arranged between the main drill rod (2) and the drill bit (3), and the main drill rod (2) and the connecting drill rod (5) as well as the connecting drill rod (5) and the drill bit (3) are fixedly connected through connecting sleeves (4);
the drilling machine (1) is an YT-28 air-leg rock drill;
the main drill rod (2) and the connecting drill rod (5) are both hexagonal drill rods;
the drill bit (3) is a diamond compact anchor head drill rod;
first flanges (6) are welded at one end, far away from the drilling machine (1), of the main drilling rod (2), one end, close to the drilling machine (1), of the drill bit (3) and two ends of the connecting drilling rod (5), and second flanges (7) are welded at two ends of the connecting sleeve (4);
first flange (6) are close to the fixed connector (15) that is equipped with of one end of adapter sleeve (4), the length of connector (15) is the half of adapter sleeve (4) length, the one end setting that first flange (6) were kept away from in connector (15) is inside adapter sleeve (4), and with adapter sleeve (4) inner peripheral surface threaded connection, the periphery of adapter sleeve (4) is personally submitted annular evenly distributed and is had a plurality of shelves strip (13).
2. The soft rock small-aperture deep-hole forming device as claimed in claim 1, wherein: the diameter of the first flange (6) is equal to that of the second flange (7), through holes (10) are uniformly distributed in an annular mode at the edge positions of the end faces of the first flange (6) and the second flange (7), and the through holes (10) in the first flange (6) and the second flange (7) are in one-to-one correspondence.
3. The soft rock small-aperture deep-hole forming device as claimed in claim 2, wherein: the blind nut (8) is welded at the position, corresponding to the through hole (10), of one side, far away from the first flange (6), of the second flange (7), the caulking groove (11) is arranged at the position, corresponding to the through hole (10), of one side, far away from the second flange (7), of the first flange (6), and the diameter of the caulking groove (11) is larger than that of the through hole (10).
4. The soft rock small-aperture deep-hole forming device as claimed in claim 3, wherein: the screw rod (9) penetrates through the inside of the through hole (10), the outer peripheral face of the screw rod (9) is attached to the inner peripheral face of the through hole (10), one end of the screw rod (9), close to the caulking groove (11), is fixedly connected with a limiting plate (12) and one end of the screw rod, close to the blind nut (8), is in threaded connection with the blind nut (8).
5. The soft rock small-aperture deep-hole forming device as claimed in claim 4, wherein: the limiting plate (12) is nested inside the caulking groove (11), and one end of the limiting plate (12) far away from the caulking groove (11) is dared with a knob (16).
6. The soft rock small-aperture deep-hole forming device as claimed in claim 1, wherein: and the edge positions of the end surfaces of the first flange (6) and the second flange (7) are provided with calibration grooves (14) in a penetrating manner.
7. The soft rock small-aperture deep-hole forming device as claimed in claim 1, wherein: the diameter of the drill bit (3) is 28-50mm, the main drill rod (2) and the connecting drill rod (5) are B19 or B22 drill rods, and the lengths of the main drill rod (2) and the connecting drill rod (5) are 5 m.
8. The apparatus for forming a small-bore deep hole in soft rock according to any one of claims 1 to 7, wherein the apparatus is applied to soft rock with Rc < 30MPa, the depth of the formed hole is 10 to 15m, and the bore diameter of the formed hole is 28 to 50 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010001656.0A CN111021941B (en) | 2020-01-02 | 2020-01-02 | Soft rock small-bore diameter deep hole pore-forming equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010001656.0A CN111021941B (en) | 2020-01-02 | 2020-01-02 | Soft rock small-bore diameter deep hole pore-forming equipment |
Publications (2)
| Publication Number | Publication Date |
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| CN111021941A CN111021941A (en) | 2020-04-17 |
| CN111021941B true CN111021941B (en) | 2021-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010001656.0A Active CN111021941B (en) | 2020-01-02 | 2020-01-02 | Soft rock small-bore diameter deep hole pore-forming equipment |
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| CN (1) | CN111021941B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2641263Y (en) * | 2003-08-30 | 2004-09-15 | 铉家盈 | Drilling rod with increased length |
| CN102367725A (en) * | 2011-11-08 | 2012-03-07 | 山东鲁南装备制造有限公司 | Large-aperture spiral deep hole drill |
| CN104343383A (en) * | 2014-10-08 | 2015-02-11 | 陕西师范大学 | Drilling device for earthen archaeological site |
| CN204975415U (en) * | 2015-09-22 | 2016-01-20 | 武汉市众恒六合地质装备科技有限责任公司 | Portable rig |
| CN107916895A (en) * | 2017-12-25 | 2018-04-17 | 重庆九州探矿机械技术开发有限公司 | A kind of Multifunctional drill |
-
2020
- 2020-01-02 CN CN202010001656.0A patent/CN111021941B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2641263Y (en) * | 2003-08-30 | 2004-09-15 | 铉家盈 | Drilling rod with increased length |
| CN102367725A (en) * | 2011-11-08 | 2012-03-07 | 山东鲁南装备制造有限公司 | Large-aperture spiral deep hole drill |
| CN104343383A (en) * | 2014-10-08 | 2015-02-11 | 陕西师范大学 | Drilling device for earthen archaeological site |
| CN204975415U (en) * | 2015-09-22 | 2016-01-20 | 武汉市众恒六合地质装备科技有限责任公司 | Portable rig |
| CN107916895A (en) * | 2017-12-25 | 2018-04-17 | 重庆九州探矿机械技术开发有限公司 | A kind of Multifunctional drill |
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| Publication number | Publication date |
|---|---|
| CN111021941A (en) | 2020-04-17 |
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Inventor after: Tang Shaowu Inventor after: Zhu Xiaohong Inventor after: Hou Jingtong Inventor after: Long Wenhua Inventor after: Xin Wei Inventor after: Zhang Yonghai Inventor after: Cao Luping Inventor after: Duan Sai Inventor after: Wang Zhipeng Inventor after: Liu Zhenguang Inventor after: Liu Yuanxin Inventor after: Yu Jiawu Inventor after: Shi Xiaojun Inventor after: Chen Jun Inventor after: Wang Jian Inventor after: Hu Jia Inventor after: Zhang Shubo Inventor after: Guo Zhenzhi Inventor after: Chen Jiehua Inventor after: Yang Zhanfeng Inventor after: Xiong Liang Inventor after: Xu Teng Inventor after: Xu Sheng Inventor after: Zhou Xitao Inventor before: Tang Shaowu Inventor before: Yu Jiawu Inventor before: Guo Zhenzhi Inventor before: Chen Jiehua Inventor before: Yang Zhanfeng Inventor before: Xiong Liang Inventor before: Xu Teng Inventor before: Xu Sheng |
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