CN112482990A - Drilling equipment is used in coal exploitation - Google Patents
Drilling equipment is used in coal exploitation Download PDFInfo
- Publication number
- CN112482990A CN112482990A CN202011317157.9A CN202011317157A CN112482990A CN 112482990 A CN112482990 A CN 112482990A CN 202011317157 A CN202011317157 A CN 202011317157A CN 112482990 A CN112482990 A CN 112482990A
- Authority
- CN
- China
- Prior art keywords
- adjusting screw
- drilling
- lifting column
- vehicle body
- drill bit
- 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.)
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Classifications
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/02—Drilling rigs characterized by means for land transport with their own drive, e.g. skid mounting or wheel mounting
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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
- E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
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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
- E21B15/00—Supports for the drilling machine, e.g. derricks or masts
- E21B15/003—Supports for the drilling machine, e.g. derricks or masts adapted to be moved on their substructure, e.g. with skidding means; adapted to drill a plurality of wells
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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
- E21B15/00—Supports for the drilling machine, e.g. derricks or masts
- E21B15/04—Supports for the drilling machine, e.g. derricks or masts specially adapted for directional drilling, e.g. slant hole rigs
-
- 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
-
- 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
- E21B7/04—Directional drilling
Abstract
The invention discloses a drilling device for coal mining, which comprises a vehicle body, a moving mechanism for driving the vehicle body to travel and a drilling mechanism for mining; the drilling mechanism is rotatably arranged on the vehicle body and comprises a shell, a lifting column and a drill bit, the lifting column is slidably arranged in the shell, and the drill bit is arranged at the lower end of the lifting column; a first-stage adjusting screw is rotatably arranged in the shell, and the lower side of the first-stage adjusting screw is in threaded connection with the lifting column; two mounting grooves have been seted up to the inside left and right sides symmetry of lift post, rotate in the mounting groove and install second grade adjusting screw, and still slidable mounting has the sliding sleeve in the mounting groove, the lower extreme and the drill bit fixed connection of sliding sleeve, second grade adjusting screw's downside and sliding sleeve threaded connection. The drilling mechanism is stretched for multiple times by controlling the rotation of the primary adjusting screw and the secondary adjusting screw, the position of the drill bit is changed, the drilling depth of the drilling mechanism is changed, and the working range of the drilling mechanism is enlarged.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a drilling device for coal mining.
Background
Coal is a combustible black or brown black sedimentary rock, usually occurs in the rock strata or veins of coal beds or coal seams, mainly consists of elements such as carbon, hydrogen, oxygen, nitrogen, sulfur and phosphorus, the sum of the first three accounts for about more than 95% of organic matters, is a very important energy source, and mainly produces electricity or heat energy through combustion; is also an important raw material for metallurgy and chemical industry, and is used for refining metals or producing chemical fertilizers and a plurality of chemical products.
Coal mines refer to places rich in coal resources and are generally divided into underground coal mines and opencast coal mines. When the coal seam is far from the ground surface, a tunnel is usually dug to the underground, so that the coal is a mineworker coal mine. When the coal seam is very close to the earth surface, the coal is generally excavated by directly stripping the earth surface, which is an open pit coal mine.
Coal mining needs utilize drilling mechanism to carry out the trompil, and trompil mechanism length among the prior art is fixed, can't extend to the trompil degree of depth that has led to the trompil mechanism is fixed, and application range is less, can't satisfy growing exploitation demand.
Disclosure of Invention
The invention aims to provide a drilling device for coal mining, which solves the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a drilling device for coal mining comprises a vehicle body, a moving mechanism for driving the vehicle body to move and a drilling mechanism for mining; the drilling mechanism is rotatably arranged in the middle of the vehicle body and comprises a shell, a lifting column and a drill bit, the lifting column is slidably arranged in the shell, and the drill bit is arranged at the lower end of the lifting column; a first-stage adjusting screw is rotatably arranged in the shell, and the lower side of the first-stage adjusting screw is in threaded connection with the lifting column; two mounting grooves have been seted up to the inside left and right sides symmetry of lift post, rotate in the mounting groove and install second grade adjusting screw, and still slidable mounting has the sliding sleeve in the mounting groove, the lower extreme and the drill bit fixed connection of sliding sleeve, second grade adjusting screw's downside and sliding sleeve threaded connection.
As a further scheme of the invention: the outside fixed mounting of drilling mechanism has the ring gear, rotate on the automobile body and install the master gear, master gear and ring gear meshing.
As a still further scheme of the invention: and a driving motor for driving the main gear to rotate is fixedly arranged on the vehicle body.
As a still further scheme of the invention: the shell is fixedly provided with a drilling motor, and the output end of the drilling motor is fixedly connected with the primary adjusting screw; and a rotating motor for driving the second-stage adjusting screw rod to rotate is fixedly arranged in the lifting column.
As a still further scheme of the invention: the moving mechanism is provided with four groups of moving mechanisms which are respectively arranged at four corners of the bottom of the vehicle body, the moving mechanism comprises support rods which are rotatably arranged at the bottom of the vehicle body and adjusting hydraulic rods which are symmetrically hinged to the left side and the right side of the support rods, and the telescopic ends of the adjusting hydraulic rods are hinged to the support rods.
As a still further scheme of the invention: the lower extreme of bracing piece is connected and is installed the mounting bracket, and the bottom fixed mounting of mounting bracket has the support, evenly rotates on the support and installs a plurality of truckles.
As a still further scheme of the invention: the spout has been seted up to the downside of bracing piece, and the inside slidable mounting of spout has the connecting rod, and damping spring and spout fixed connection are passed through to the upper end of connecting rod, the lower extreme and the mounting bracket fixed connection of connecting rod.
As a still further scheme of the invention: the lifting column is provided with a sliding section and an opening end, the length of the opening end is larger than that of the sliding section, and a plurality of spiral blades are fixedly mounted on the outer side of the lifting column at the opening end.
Compared with the prior art, the invention has the beneficial effects that: the drilling mechanism comprises a shell, a lifting column and a drill bit, wherein a primary adjusting screw is rotatably mounted in the shell, the lower side of the primary adjusting screw is in threaded connection with the lifting column, two mounting grooves are symmetrically formed in the left side and the right side of the interior of the lifting column, a secondary adjusting screw is rotatably mounted in each mounting groove, a sliding sleeve is further slidably mounted in each mounting groove, the lower end of each sliding sleeve is fixedly connected with the drill bit, the drilling mechanism is extended for multiple times by controlling the rotation of the primary adjusting screw and the secondary adjusting screw, the position of the drill bit is changed, the drilling depth of the drilling mechanism is improved, and the working range of the drilling mechanism is enlarged.
Drawings
Fig. 1 is a schematic structural diagram of a drilling device for coal mining.
Fig. 2 is a partially enlarged schematic view of a portion a in fig. 1.
Fig. 3 is a schematic structural view of a drilling mechanism in the embodiment 1 of the drilling device for coal mining.
Fig. 4 is an external view of a drilling mechanism in the drilling apparatus for coal mining use in example 2.
In the figure: 1-vehicle body, 2-adjusting hydraulic rod, 3-supporting rod, 4-mounting rack, 5-support, 6-caster, 7-main gear, 8-driving motor, 9-gear ring, 10-drilling mechanism, 11-damping spring, 12-connecting rod, 13-sliding chute, 14-shell, 15-lifting column, 16-drilling motor, 17-primary adjusting screw, 18-rotating motor, 19-secondary adjusting screw, 20-sliding sleeve, 21-drill bit, 22-sliding section, 23-drilling end and 24-helical blade.
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.
Example 1
Referring to fig. 1 to 3, in an embodiment of the present invention, a drilling device for coal mining includes a vehicle body 1, a moving mechanism for driving the vehicle body 1 to travel, and a drilling mechanism 10 for mining; the drilling mechanism 10 is rotatably arranged in the middle of the vehicle body 1, the drilling mechanism 10 comprises a shell 14, a lifting column 15 and a drill bit 21, the lifting column 15 is slidably arranged in the shell 14, and the drill bit 21 is arranged at the lower end of the lifting column 15; a primary adjusting screw 17 is rotatably mounted in the shell 14, the lower side of the primary adjusting screw 17 is in threaded connection with the lifting column 15 to control the primary adjusting screw 17 to rotate, and the primary adjusting screw 17 drives the lifting column 15 to slide up and down in the shell 14, so that the position of the drill bit 21 is adjusted; two mounting grooves are symmetrically formed in the left side and the right side of the interior of the lifting column 15, a secondary adjusting screw 19 is rotatably mounted in each mounting groove, a sliding sleeve 20 is further slidably mounted in each mounting groove, the lower end of each sliding sleeve 20 is fixedly connected with a drill bit 21, the lower side of each secondary adjusting screw 19 is in threaded connection with the corresponding sliding sleeve 20, the secondary adjusting screw 19 is driven to rotate, the sliding sleeves 20 are driven to slide in the mounting grooves, the drill bits 21 are driven to slide outwards when the sliding sleeves 20 slide outwards, the positions of the drill bits 21 are changed, and the drilling depth of the drill bits 21;
specifically, in this embodiment, a gear ring 9 is fixedly mounted on the outer side of the drilling mechanism 10, a main gear 7 is rotatably mounted on the vehicle body 1, and the main gear 7 is engaged with the gear ring 9 and used for driving the gear ring 9 and the drilling mechanism 10 to rotate;
further, in this embodiment, a driving motor 8 for driving the main gear 7 to rotate is fixedly installed on the vehicle body 1;
a drilling motor 16 is fixedly mounted on the shell 14, and the output end of the drilling motor 16 is fixedly connected with a primary adjusting screw 17 to drive the primary adjusting screw 17 to rotate; a rotating motor 18 for driving a secondary adjusting screw 19 to rotate is fixedly arranged inside the lifting column 15;
the four groups of moving mechanisms are respectively arranged at four corners of the bottom of the vehicle body 1, each moving mechanism comprises a support rod 3 rotatably arranged at the bottom of the vehicle body 1 and two adjusting hydraulic rods 2 symmetrically hinged to the left side and the right side of the support rod 3, the telescopic ends of the adjusting hydraulic rods 2 are hinged to the support rods 3, and the rotating angle of the support rods 3 is changed by adjusting the telescopic lengths of the two adjusting hydraulic rods 2;
the lower end of the supporting rod 3 is connected with a mounting frame 4, the bottom of the mounting frame 4 is fixedly provided with a support 5, the support 5 is uniformly and rotatably provided with a plurality of trundles 6 for driving the device to move, and the rotating angle of the supporting rod 3 is changed in the moving process, so that the inclination angle of the vehicle body 1 is changed, the vehicle body 1 can conveniently climb and descend in a coal mine, the drilling mechanism 10 can be aligned to the drilling position, and the drilling efficiency is improved;
specifically, in this embodiment, the lower side of the support rod 3 is provided with a sliding groove 13, a connecting rod 12 is slidably mounted inside the sliding groove 13, the upper end of the connecting rod 12 is fixedly connected with the sliding groove 13 through a damping spring 11, and the lower end of the connecting rod 12 is fixedly connected with the mounting frame 4.
Example 2
Referring to fig. 1 to 3, in an embodiment of the present invention, a drilling device for coal mining includes a vehicle body 1, a moving mechanism for driving the vehicle body 1 to travel, and a drilling mechanism 10 for mining; the drilling mechanism 10 is rotatably arranged in the middle of the vehicle body 1, the drilling mechanism 10 comprises a shell 14, a lifting column 15 and a drill bit 21, the lifting column 15 is slidably arranged in the shell 14, and the drill bit 21 is arranged at the lower end of the lifting column 15; a primary adjusting screw 17 is rotatably mounted in the shell 14, the lower side of the primary adjusting screw 17 is in threaded connection with the lifting column 15 to control the primary adjusting screw 17 to rotate, and the primary adjusting screw 17 drives the lifting column 15 to slide up and down in the shell 14, so that the position of the drill bit 21 is adjusted; two mounting grooves are symmetrically formed in the left side and the right side of the interior of the lifting column 15, a secondary adjusting screw 19 is rotatably mounted in each mounting groove, a sliding sleeve 20 is further slidably mounted in each mounting groove, the lower end of each sliding sleeve 20 is fixedly connected with a drill bit 21, the lower side of each secondary adjusting screw 19 is in threaded connection with the corresponding sliding sleeve 20, the secondary adjusting screw 19 is driven to rotate, the sliding sleeves 20 are driven to slide in the mounting grooves, the drill bits 21 are driven to slide outwards when the sliding sleeves 20 slide outwards, the positions of the drill bits 21 are changed, and the drilling depth of the drill bits 21;
specifically, in this embodiment, a gear ring 9 is fixedly mounted on the outer side of the drilling mechanism 10, a main gear 7 is rotatably mounted on the vehicle body 1, and the main gear 7 is engaged with the gear ring 9 and used for driving the gear ring 9 and the drilling mechanism 10 to rotate;
further, in this embodiment, a driving motor 8 for driving the main gear 7 to rotate is fixedly installed on the vehicle body 1;
a drilling motor 16 is fixedly mounted on the shell 14, and the output end of the drilling motor 16 is fixedly connected with a primary adjusting screw 17 to drive the primary adjusting screw 17 to rotate; a rotating motor 18 for driving a secondary adjusting screw 19 to rotate is fixedly arranged inside the lifting column 15;
the four groups of moving mechanisms are respectively arranged at four corners of the bottom of the vehicle body 1, each moving mechanism comprises a support rod 3 rotatably arranged at the bottom of the vehicle body 1 and two adjusting hydraulic rods 2 symmetrically hinged to the left side and the right side of the support rod 3, the telescopic ends of the adjusting hydraulic rods 2 are hinged to the support rods 3, and the rotating angle of the support rods 3 is changed by adjusting the telescopic lengths of the two adjusting hydraulic rods 2;
the lower end of the supporting rod 3 is connected with a mounting frame 4, the bottom of the mounting frame 4 is fixedly provided with a support 5, the support 5 is uniformly and rotatably provided with a plurality of trundles 6 for driving the device to move, and the rotating angle of the supporting rod 3 is changed in the moving process, so that the inclination angle of the vehicle body 1 is changed, the vehicle body 1 can conveniently climb and descend in a coal mine, the drilling mechanism 10 can be aligned to the drilling position, and the drilling efficiency is improved;
specifically, in this embodiment, the lower side of the support rod 3 is provided with a sliding groove 13, a connecting rod 12 is slidably mounted inside the sliding groove 13, the upper end of the connecting rod 12 is fixedly connected with the sliding groove 13 through a damping spring 11, and the lower end of the connecting rod 12 is fixedly connected with the mounting frame 4.
Referring to fig. 4, the difference between the present embodiment and embodiment 1 is:
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A drilling device for coal mining comprises a vehicle body (1), a moving mechanism for driving the vehicle body (1) to move and a drilling mechanism (10) for mining; the drilling mechanism (10) is rotatably arranged in the middle of the vehicle body (1), and is characterized in that the drilling mechanism (10) comprises a shell (14), a lifting column (15) and a drill bit (21), the lifting column (15) is slidably arranged in the shell (14), and the drill bit (21) is arranged at the lower end of the lifting column (15); a primary adjusting screw (17) is rotatably arranged in the shell (14), and the lower side of the primary adjusting screw (17) is in threaded connection with the lifting column (15); two mounting grooves have been seted up to the inside left and right sides symmetry of lift post (15), rotate in the mounting groove and install second grade adjusting screw (19), and still slidable mounting has sliding sleeve (20) in the mounting groove, the lower extreme and drill bit (21) fixed connection of sliding sleeve (20), the downside and sliding sleeve (20) threaded connection of second grade adjusting screw (19).
2. The coal mining and drilling device according to claim 1, characterized in that a gear ring (9) is fixedly mounted on the outer side of the drilling mechanism (10), a main gear (7) is rotatably mounted on the vehicle body (1), and the main gear (7) is meshed with the gear ring (9).
3. The coal mining and drilling device according to claim 2, characterized in that a driving motor (8) for driving the main gear (7) to rotate is fixedly arranged on the vehicle body (1).
4. The drilling device for coal mining according to claim 1, characterized in that a drilling motor (16) is fixedly mounted on the housing (14), and the output end of the drilling motor (16) is fixedly connected with a primary adjusting screw (17); and a rotating motor (18) for driving the second-stage adjusting screw rod (19) to rotate is fixedly arranged in the lifting column (15).
5. The coal mining drilling device according to any one of claims 1 to 4, wherein four groups of moving mechanisms are provided and are respectively installed at four corners of the bottom of the vehicle body (1), each moving mechanism comprises a support rod (3) rotatably installed at the bottom of the vehicle body (1) and two adjusting hydraulic rods (2) symmetrically hinged to the left side and the right side of the support rod (3), and the telescopic ends of the adjusting hydraulic rods (2) are hinged to the support rods (3).
6. The drilling device for coal mining according to claim 5, characterized in that the lower end of the support rod (3) is connected with a mounting rack (4), a support (5) is fixedly mounted at the bottom of the mounting rack (4), and a plurality of casters (6) are uniformly and rotatably mounted on the support (5).
7. The coal drilling device as claimed in claim 6, characterized in that a sliding groove (13) is formed in the lower side of the support rod (3), a connecting rod (12) is slidably mounted inside the sliding groove (13), the upper end of the connecting rod (12) is fixedly connected with the sliding groove (13) through a damping spring (11), and the lower end of the connecting rod (12) is fixedly connected with the mounting frame (4).
8. The coal mining and drilling device according to claim 1, characterized in that the lifting column (15) is provided with a sliding section (22) and a hole opening end (23), the length of the hole opening end (23) is larger than that of the sliding section (22), and a plurality of spiral blades (24) are fixedly installed on the outer side of the hole opening end (23) of the lifting column (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011317157.9A CN112482990A (en) | 2020-11-23 | 2020-11-23 | Drilling equipment is used in coal exploitation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011317157.9A CN112482990A (en) | 2020-11-23 | 2020-11-23 | Drilling equipment is used in coal exploitation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112482990A true CN112482990A (en) | 2021-03-12 |
Family
ID=74932818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011317157.9A Withdrawn CN112482990A (en) | 2020-11-23 | 2020-11-23 | Drilling equipment is used in coal exploitation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112482990A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2007116352A (en) * | 2007-05-03 | 2008-11-20 | нов Владимир Иванович Скл (RU) | METHOD FOR REMOVING PIPES FROM A WELL AND A DEVICE FOR ITS IMPLEMENTATION |
| CN108678663A (en) * | 2018-05-14 | 2018-10-19 | 西南石油大学 | A kind of shale gas exploitation exploration multi-angle drilling device |
| CN108756736A (en) * | 2018-05-14 | 2018-11-06 | 西南石油大学 | One kind being convenient for shale gas exploitation slope drilling equipment |
| CN208294431U (en) * | 2018-05-14 | 2018-12-28 | 廊坊市穿山甲工程机械有限公司 | A kind of shale gas exploitation exploration multi-angle drilling device |
| CN110714794A (en) * | 2019-11-11 | 2020-01-21 | 周正波 | Supporting platform device for coal mine drilling machine |
| CN210665127U (en) * | 2019-10-14 | 2020-06-02 | 熊灿阳 | Multi-stage drill rod hydrogeology sample thief |
| CN210831168U (en) * | 2019-07-10 | 2020-06-23 | 济源职业技术学院 | Multi-stage external heat dissipation support for notebook computer |
| CN111331173A (en) * | 2020-04-01 | 2020-06-26 | 浙江机电职业技术学院 | Asymmetric double-face machining drilling device and using method |
-
2020
- 2020-11-23 CN CN202011317157.9A patent/CN112482990A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2007116352A (en) * | 2007-05-03 | 2008-11-20 | нов Владимир Иванович Скл (RU) | METHOD FOR REMOVING PIPES FROM A WELL AND A DEVICE FOR ITS IMPLEMENTATION |
| CN108678663A (en) * | 2018-05-14 | 2018-10-19 | 西南石油大学 | A kind of shale gas exploitation exploration multi-angle drilling device |
| CN108756736A (en) * | 2018-05-14 | 2018-11-06 | 西南石油大学 | One kind being convenient for shale gas exploitation slope drilling equipment |
| CN208294431U (en) * | 2018-05-14 | 2018-12-28 | 廊坊市穿山甲工程机械有限公司 | A kind of shale gas exploitation exploration multi-angle drilling device |
| CN210831168U (en) * | 2019-07-10 | 2020-06-23 | 济源职业技术学院 | Multi-stage external heat dissipation support for notebook computer |
| CN210665127U (en) * | 2019-10-14 | 2020-06-02 | 熊灿阳 | Multi-stage drill rod hydrogeology sample thief |
| CN110714794A (en) * | 2019-11-11 | 2020-01-21 | 周正波 | Supporting platform device for coal mine drilling machine |
| CN111331173A (en) * | 2020-04-01 | 2020-06-26 | 浙江机电职业技术学院 | Asymmetric double-face machining drilling device and using method |
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| PB01 | Publication | ||
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Application publication date: 20210312 |