CN111946252A - Ground drilling device that punches - Google Patents
Ground drilling device that punches Download PDFInfo
- Publication number
- CN111946252A CN111946252A CN202010861808.4A CN202010861808A CN111946252A CN 111946252 A CN111946252 A CN 111946252A CN 202010861808 A CN202010861808 A CN 202010861808A CN 111946252 A CN111946252 A CN 111946252A
- Authority
- CN
- China
- Prior art keywords
- cavity
- motor
- linkage
- shaft
- soil
- 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.)
- Withdrawn
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Classifications
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/003—Drilling with mechanical conveying means
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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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
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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
- 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
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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
Abstract
The invention discloses a ground punching drilling device, which comprises a box body, wherein a drilling cavity which is communicated up and down is arranged in the box body, a moving shaft sliding cavity which is communicated left and right is arranged on the right side of the drilling cavity, a transmission cavity with a leftward opening is arranged on the right side of the moving shaft sliding cavity, a transmission device is arranged in the transmission cavity, and the transmission device comprises a motor air cavity positioned on the right side of the drilling cavity.
Description
Technical Field
The invention relates to the field of drilling equipment, in particular to a ground punching and drilling device.
Background
Drilling technology is applied to various fields, and most commonly, drilling equipment is needed to be used for punching the ground in the foundation constructing process, the geological exploration process and the operation process of drilling a vertical shaft.
The traditional earth boring device has the advantages that the earth discharging function is not very strong, the boring operation efficiency is low, the ground boring device capable of automatically clearing soil is designed, and the operation requirements of convenience and high efficiency are met. The present invention sets forth a device that solves the above problems.
Disclosure of Invention
The technical problem is as follows:
the ground punching drilling device capable of automatically cleaning and drilling out soil is designed, and the requirements for convenient and efficient operation are met.
In order to solve the problems, the ground punching drilling device comprises a box body, wherein a drilling cavity which is communicated up and down is arranged in the box body, a moving shaft sliding cavity which is communicated left and right is arranged on the right side of the drilling cavity, a transmission cavity with a leftward opening is arranged on the right side of the moving shaft sliding cavity, a transmission device is arranged in the transmission cavity and comprises a motor air cavity positioned on the right side of the drilling cavity, a motor sliding cavity with a leftward opening is arranged on the right side of the motor air cavity, a motor is connected in the motor sliding cavity in a sliding manner, a motor spring is fixedly connected between the right side of the motor and the inner wall of the right side of the motor sliding cavity, a motor shaft is in power connection with the left side of the motor, a motor gear is fixedly connected to the left side of the motor shaft, a moving shaft sliding block is connected to the inner wall of the left side of the transmission, the left side of the movable shaft is fixedly provided with a lifting wheel, the inner wall of the drilling cavity is provided with a clamping device, the clamping device comprises three linkage sliding cavities which are positioned at the front side, the rear side and the left side of the drilling cavity and open towards the drilling cavity, the linkage sliding cavities are internally and slidably connected with linkage sliding blocks, a linkage spring is fixedly connected between each linkage sliding block and the linkage sliding cavity, the linkage sliding blocks are close to the sides of the drilling cavity and provided with linkage sliding block inner cavities which open towards the drilling cavity, the linkage sliding block inner cavities are internally and rotatably connected with linkage sliding block shafts, the linkage sliding block shafts at the upper side and the lower side are fixedly provided with clamping wheels, the linkage sliding block shaft at the left side is fixedly provided with a side fixed pulley, the drilling cavity is internally provided with a drilling device, the drilling device comprises a threaded drill rod which is provided with threaded grooves and can be in sliding connection with the clamping wheels and, the upper side of a thread groove of the threaded drill rod is fixedly provided with a threaded rack which is meshed with the lifting wheel for transmission, the lower side of the thread groove of the threaded drill rod is fixedly provided with a sliding gasket which is in sliding connection with the lifting wheel, and the right side of the transmission cavity is provided with a soil discharging device.
The transmission device further comprises a stay wire shaft rotatably connected with the inner wall of the right side of the transmission cavity, the stay wire shaft is fixedly provided with a stay wire gear capable of being meshed with the motor gear in a transmission mode, the left side of the stay wire gear is fixedly provided with a winding wheel, the inner wall of the upper side of the transmission cavity is fixedly provided with a fixed pulley fixed block, the fixed pulley fixed block is rotatably connected with a fixed pulley shaft, the fixed pulley shaft is fixedly provided with a fixed pulley, the winding wheel is fixedly connected between sliding blocks of the moving shaft and is wound on a pulley line on the winding wheel in a sliding connection with the fixed pulley.
Wherein, clamping device still include with motor linkage pipe and rear side fixed connection's between the smooth chamber of linkage motor linkage pipe, the front side smooth chamber of linkage and left fixedly connected with side pulley linkage pipe between the smooth chamber of linkage, the left side smooth chamber upside of linkage be equipped with the side pulley reset tube that link up in the apron left side, the smooth chamber upside of motor be equipped with the motor reset tube that link up in the apron left side, the side pulley reset tube with the slip of motor reset tube left side is equipped with the piston, the fixed articulated fixed block that is equipped with in apron left side, articulated fixed block rotates and is connected with the articulated shaft, the articulated shaft fixed be equipped with piston fixed connection's apron.
The drilling device further comprises a threaded drill rod and a drill rod inner cavity with an upward opening, belt wheels are connected in the drill rod inner cavity in a rotating mode and are symmetrical up and down, belt wheels are fixedly arranged on the belt wheels, the two belt wheels are driven through belt wheels, fifteen soil pushing plates are fixedly arranged on the belt wheels, soil guide grooves are arranged between the threaded grooves of the threaded drill rod and the drill rod inner cavity in a penetrating mode, and limiting blocks which are symmetrical front and back are fixedly arranged on the upper side of the threaded drill rod.
The soil discharging device comprises a soil collecting cavity with an upward opening at the right side of the transmission cavity, a soil pumping box is fixedly arranged on the upper side of the soil collecting cavity, the soil collecting cavity is connected with a soil pumping guide pipe fixedly connected between inner cavities of the drill rods, a through soil pumping guide pipe cavity is arranged in the soil pumping guide pipe, a soil discharging shaft is rotatably connected to the inner wall of the lower side of the soil collecting cavity, a soil discharging push plate is fixedly arranged on the soil discharging shaft, and a soil discharging port which is through inside and outside is arranged at the right side of the soil collecting cavity.
The invention has the beneficial effects that: the invention adds the discharge function of the excavated soil on the basis of the original drilling technology, improves the drilling efficiency, realizes that the drilling device drills downwards, automatically lifts the drill bit when reaching the lowest point, controls the drill rod not to deflect vertically by the clamping device, effectively prolongs the service life of the drill bit, and further assists the drilling device to discharge soil to prevent the drilling device from being blocked by soil.
Drawings
For ease of illustration, the invention is described in detail by the following specific examples and figures.
FIG. 1 is a schematic diagram of the overall structure of a surface boring and drilling apparatus according to the present invention;
FIG. 2 is a schematic view of the structure in the direction "A-A" of FIG. 1;
FIG. 3 is a schematic view of the structure in the direction "B-B" of FIG. 1;
fig. 4 is a partially enlarged schematic view at "C" of fig. 1.
Detailed Description
The invention will now be described in detail with reference to fig. 1-4, for ease of description, the orientations described below will now be defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.
The invention relates to a ground drilling device, which is mainly applied to ground drilling, and the invention is further explained by combining the attached drawings of the invention:
the invention relates to a ground punching drilling device, which comprises a box body 17, wherein a drilling cavity 18 which is communicated up and down is arranged in the box body 17, a moving shaft sliding cavity 52 which is communicated left and right is arranged at the right side of the drilling cavity 18, a transmission cavity 28 with a leftward opening is arranged at the right side of the moving shaft sliding cavity 52, a transmission device 71 is arranged in the transmission cavity 28, the transmission device 71 comprises a motor air cavity 45 which is positioned at the right side of the drilling cavity 18, a motor sliding cavity 43 with a leftward opening is arranged at the right side of the motor air cavity 45, a motor 44 is connected in the motor sliding cavity 43 in a sliding way, a motor spring 42 is fixedly connected between the right side of the motor 44 and the inner wall at the right side of the motor sliding cavity 43, a motor shaft 47 is dynamically connected at the left side of the motor 44, a motor gear 48 is fixedly connected at the left side of the motor shaft 47, a, a transmission gear 49 which can be in meshing transmission with the motor gear 48 is fixedly arranged on the right side of the moving shaft 51, a lifting wheel 58 is fixedly arranged on the left side of the moving shaft 51, a clamping device 72 is arranged on the inner wall of the drilling cavity 18, the clamping device 72 comprises three linkage sliding cavities 62 which are positioned on the front side, the rear side and the left side of the drilling cavity 18 and open to the drilling cavity 18, a linkage sliding block 63 is connected in the linkage sliding cavity 62 in a sliding manner, a linkage spring 61 is fixedly connected between the linkage sliding block 63 and the linkage sliding cavity 62, a linkage sliding block inner cavity 60 which is open to the drilling cavity 18 is arranged on the side of the linkage sliding block 63 close to the drilling cavity 18, a linkage sliding block shaft 59 is connected in the linkage sliding block inner cavity 60 in a rotating manner, a clamping wheel 64 is fixedly arranged on the linkage sliding block shaft 59 on the upper side and the lower side, a drilling device 73 is arranged in the drilling cavity 18, the drilling device 73 comprises a threaded drill rod 19 which is provided with a threaded groove and can be slidably connected with the clamping wheel 64 and the side fixed pulley 53, a drill bit 68 is fixedly arranged on the lower side of the threaded drill rod 19, a threaded rack 66 which is in meshing transmission with the lifting wheel 58 is fixedly arranged on the upper side of the threaded groove of the threaded drill rod 19, a sliding gasket 67 which is slidably connected with the lifting wheel 58 is fixedly arranged on the lower side of the threaded groove of the threaded drill rod 19, and a soil discharging device 74 is arranged on the right side of the transmission cavity 28.
According to the embodiment, the transmission device 71 is described in detail below, the transmission device 71 further includes a pulling shaft 39 rotatably connected to the inner wall of the right side of the transmission cavity 28, the pulling shaft 39 is fixedly provided with a pulling gear 37 capable of meshing with the motor gear 48 for transmission, the left side of the pulling gear 37 is fixedly provided with a winding wheel 38 with the pulling shaft 39, the inner wall of the upper side of the transmission cavity 28 is fixedly provided with a fixed pulley fixed block 25, the fixed pulley fixed block 25 is rotatably connected with a fixed pulley shaft 26, the fixed pulley shaft 26 is fixedly provided with a fixed pulley 27, the winding wheel 38 and the moving shaft slider 50 are fixedly connected and slidably connected with the fixed pulley 27 to form a pulley line 33 wound on the winding wheel 38, when the motor 44 is located at the left side, the motor gear 48 is meshed with the transmission gear 49 for transmission, and when the motor 44 is located at the right side, the motor gear 48 is in meshed transmission with the wire pulling gear 37.
According to the embodiment, the following detailed description is made on the clamping device 72, the clamping device 72 further comprises a motor linkage tube 46 fixedly connected between the motor linkage tube 46 and the linkage sliding cavity 62 at the rear side, a front side linkage sliding cavity 62 and a left side linkage sliding wheel linkage tube 56 fixedly connected between the linkage sliding cavity 62, a left side linkage sliding cavity 62 upper side is provided with a side sliding wheel reset tube 15 communicated with the left side of the cover plate 11, a motor sliding cavity 43 upper side is provided with a motor reset tube 16 communicated with the left side of the cover plate 11, a piston 12 is slidably arranged on the left side of the side sliding wheel reset tube 15 and the motor reset tube 16, the cover plate 11 is fixedly provided with a hinge fixing block 14 at the left side, the hinge fixing block 14 is rotatably connected with a hinge shaft 13, the hinge shaft 13 is fixedly provided with the cover plate 11 fixedly connected with the piston 12, and the front and rear linkage spring 61 elasticity is less than the left linkage spring 61 and the motor spring 42, the interlocking slide 63 therefore remains stationary when pushed open, only when the piston 12 is opened, actively adjusting the air pressure to return it to its initial position.
According to an embodiment, the drilling device 73 is described in detail below, the drilling device 73 further includes a threaded drill rod 19 and a drill rod inner cavity 20 with an upward opening in the drill bit 68, a pulley shaft 23 which is symmetrical up and down is rotatably connected in the drill rod inner cavity 20, a pulley 22 is fixedly arranged on the pulley shaft 23, two pulleys 22 are driven by a pulley belt 24, fifteen bulldozer blades 21 are fixedly arranged on the pulley belt 24, a soil guide groove 57 is arranged between a thread groove of the threaded drill rod 19 and the drill rod inner cavity 20 in a penetrating manner, a limiting block 65 which is symmetrical front and back is fixedly arranged on the upper side of the threaded drill rod 19, the lifting wheel 58 drives the drilling device 73 to rotate and descend, and the side fixed pulley 53 and the clamping wheel 64 control the position of the threaded drill rod 19.
According to an embodiment, the soil discharging device 74 is described in detail below, the soil discharging device 74 includes a soil collecting cavity 32 located at the right side of the transmission cavity 28 and having an upward opening, a soil pumping box 31 is fixedly disposed at the upper side of the soil collecting cavity 32, a soil pumping duct 30 is fixedly connected between the soil collecting cavity 32 and the inner drill rod cavity 20, a through soil pumping duct cavity 29 is disposed in the soil pumping duct 30, a soil discharging shaft 34 is rotatably connected to the inner wall of the lower side of the soil collecting cavity 32, a soil discharging push plate 35 is fixedly disposed on the soil discharging shaft 34, a soil discharging port 36 is disposed at the right side of the soil collecting cavity 32 and is through inside and outside, the soil pumping box 31 pumps soil in the inner drill rod cavity 20 into the soil collecting cavity 32 through the soil pumping duct cavity 29, and the soil discharging push plate 35 rotates to push out through the soil discharging port 36.
The steps of using a surface boring and drilling apparatus herein will be described in detail with reference to fig. 1 to 4:
initially, the motor spring 42 and the linkage spring 61 are in a relaxed state, the chucking wheel 64 is in contact with the threaded drill rod 19, the side fixed pulley 53 is not in contact with the threaded drill rod 19, the movable shaft slider 50 is located at the lowest position, and the motor gear 48 is meshed with the transmission gear 49.
During drilling, the motor gear 48 is meshed with the transmission gear 49, so that the lifting wheel 58 is matched with the threaded rack 66 to drive the threaded drill rod 19 to rotate and descend, and the clamping wheel 64 is connected with the threaded drill rod 19 in a sliding mode.
During soil discharging, soil enters the inner cavity 20 of the drill rod through the soil guide groove 57, the wheel shaft 23 rotates, the soil is continuously pushed to the upper side of the inner cavity 20 of the drill rod by the moving of the soil pushing plate 21, the soil in the inner cavity 20 of the drill rod is pumped into the soil collecting cavity 32 by the soil pumping box 31 through the soil pumping guide pipe cavity 29, and the soil discharging push plate 35 rotates to be pushed out through the soil discharging port 36.
At the end, when the threaded drill rod 19 reaches the lowest position, the limiting block 65 pushes the clamping wheel 64 to move towards two sides, the gas in the front and rear linkage sliding cavities 62 is pushed into the left linkage sliding cavity 62 and the motor air cavity 45, the side fixed pulley 53 is in contact with the threaded drill rod 19, the motor gear 48 is meshed with the wire pulling gear 37, the winding wheel 38 rotates, the movable shaft sliding block 50 is pulled up through the pulley line 33 to drive the threaded drill rod 19 to ascend, the piston 12 is opened after the threaded drill rod 19 leaves the ground, the linkage sliding block 63 and the motor 44 are inflated inwards to reset, and meanwhile the threaded drill rod 19 and the movable shaft 51 descend to reset.
The invention has the beneficial effects that: the invention adds the discharge function of the excavated soil on the basis of the original drilling technology, improves the drilling efficiency, realizes that the drilling device drills downwards, automatically lifts the drill bit when reaching the lowest point, controls the drill rod not to deflect vertically by the clamping device, effectively prolongs the service life of the drill bit, and further assists the drilling device to discharge soil to prevent the drilling device from being blocked by soil.
In the above manner, a person skilled in the art can make various changes depending on the operation mode within the scope of the present invention.
Claims (5)
1. The utility model provides a ground drilling creeps into device, includes the box, be equipped with the drilling chamber that link up from top to bottom in the box, drilling chamber right side is equipped with the smooth chamber of removal axle that link up about, its characterized in that: the drilling machine is characterized in that a transmission cavity with a leftward opening is formed in the right side of the movable shaft sliding cavity, a transmission device is arranged in the transmission cavity and comprises a motor air cavity located on the right side of the drilling cavity, a motor sliding cavity with a leftward opening is formed in the right side of the motor air cavity, a motor is slidably connected in the motor sliding cavity, a motor spring is fixedly connected between the right side of the motor and the inner wall of the right side of the motor sliding cavity, the left side of the motor is in power connection with a motor shaft, a motor gear is fixedly connected to the left side of the motor shaft, a movable shaft sliding block is slidably connected to the inner wall of the left side of the transmission cavity, a movable shaft is rotatably connected in the movable shaft sliding block, a transmission gear capable of being in meshing transmission with the motor gear is fixedly arranged on the right side of the movable shaft, The drilling device comprises three linkage sliding cavities with openings at the rear side and the left side facing the drilling cavity, a linkage sliding block is connected in the linkage sliding cavities in a sliding manner, a linkage spring is fixedly connected between the linkage sliding block and the linkage sliding cavities, the linkage sliding block is provided with a linkage sliding block inner cavity with an opening facing the drilling cavity near the drilling cavity side, a linkage sliding block shaft is connected in the linkage sliding block inner cavity in a rotating manner, clamping wheels are fixedly arranged on the linkage sliding block shaft at the upper side and the lower side, a side fixed pulley is fixedly arranged on the linkage sliding block shaft at the left side, a drilling device is arranged in the drilling cavity and comprises a threaded drill rod which is provided with a threaded groove and can be in sliding connection with the clamping wheels and the side fixed pulley, a drill bit is fixedly arranged at the lower side of the threaded drill rod, a threaded rack which is in meshing transmission with the lifting wheel is fixedly arranged at the upper side of the threaded groove of the threaded drill rod, and, and a soil discharging device is arranged on the right side of the transmission cavity.
2. A ground boring device according to claim 1, wherein: the transmission device further comprises a stay wire shaft rotatably connected with the inner wall of the right side of the transmission cavity, the stay wire shaft is fixedly provided with a stay wire gear capable of being meshed with the motor gear in a transmission mode, the left side of the stay wire gear is fixedly provided with a winding wheel, the inner wall of the upper side of the transmission cavity is fixedly provided with a fixed pulley fixed block, the fixed pulley fixed block is rotatably connected with a fixed pulley shaft, the fixed pulley shaft is fixedly provided with a fixed pulley, the winding wheel is fixedly connected with a moving shaft sliding block, and the fixed pulley sliding block is connected with a pulley line wound on the winding wheel.
3. A ground boring device according to claim 1, wherein: clamping device still include with motor linkage pipe and rear side fixed connection's between the smooth chamber of linkage motor linkage pipe, the front side the smooth chamber of linkage and left fixedly connected with side pulley linkage pipe between the smooth chamber of linkage, the left side the smooth chamber upside of linkage be equipped with the side pulley reset tube that link up in the apron left side, the smooth chamber upside of motor be equipped with the motor reset tube that link up in the apron left side, the side pulley reset tube with the slip of motor reset tube left side is equipped with the piston, the fixed articulated fixed block that is equipped with in apron left side, articulated fixed block rotates and is connected with the articulated shaft, the articulated shaft fixed be equipped with piston fixed connection's apron.
4. A ground boring device according to claim 1, wherein: the drilling device further comprises a threaded drill rod and a drill rod inner cavity with an upward opening in the drill bit, belt wheels are rotationally connected in the drill rod inner cavity, the belt wheels are vertically symmetrical, belt wheels are fixedly arranged on the belt wheels, the two belt wheels are driven through belt wheels, fifteen soil pushing plates are fixedly arranged on the belt wheels, soil guide grooves are arranged between threaded grooves of the threaded drill rod and the drill rod inner cavity in a penetrating mode, and limiting blocks which are symmetrical front and back are fixedly arranged on the upper side of the threaded drill rod.
5. A ground boring device according to claim 1, wherein: the soil discharging device comprises a soil collecting cavity with an upward opening at the right side of the transmission cavity, a soil pumping box is fixedly arranged on the upper side of the soil collecting cavity, the soil collecting cavity is connected with a soil pumping guide pipe fixedly connected between inner cavities of the drill rods, a communicated soil pumping guide pipe cavity is arranged in the soil pumping guide pipe, a soil discharging shaft is rotatably connected to the inner wall of the lower side of the soil collecting cavity, a soil discharging push plate is fixedly arranged on the soil discharging shaft, and a soil discharging port which is communicated with the inside and the outside is arranged on the right side of the soil collecting cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010861808.4A CN111946252A (en) | 2020-08-25 | 2020-08-25 | Ground drilling device that punches |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010861808.4A CN111946252A (en) | 2020-08-25 | 2020-08-25 | Ground drilling device that punches |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111946252A true CN111946252A (en) | 2020-11-17 |
Family
ID=73360174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010861808.4A Withdrawn CN111946252A (en) | 2020-08-25 | 2020-08-25 | Ground drilling device that punches |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111946252A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113187382A (en) * | 2021-04-30 | 2021-07-30 | 中国矿业大学 | Multi-stroke drilling and digging device based on bionics principle |
-
2020
- 2020-08-25 CN CN202010861808.4A patent/CN111946252A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113187382A (en) * | 2021-04-30 | 2021-07-30 | 中国矿业大学 | Multi-stroke drilling and digging device based on bionics principle |
| CN113187382B (en) * | 2021-04-30 | 2023-02-21 | 中国矿业大学 | Multi-stroke drilling and digging device based on bionics principle |
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Application publication date: 20201117 |
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| WW01 | Invention patent application withdrawn after publication |