CN108343375A - A kind of measurable hydraulic drill rig is drilled the device and method of depth - Google Patents
A kind of measurable hydraulic drill rig is drilled the device and method of depth Download PDFInfo
- Publication number
- CN108343375A CN108343375A CN201810349609.8A CN201810349609A CN108343375A CN 108343375 A CN108343375 A CN 108343375A CN 201810349609 A CN201810349609 A CN 201810349609A CN 108343375 A CN108343375 A CN 108343375A
- Authority
- CN
- China
- Prior art keywords
- clamper
- depth
- drilling rod
- switch
- inlet pipe
- 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
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005553 drilling Methods 0.000 claims abstract description 67
- 239000003921 oil Substances 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 18
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 18
- 239000010727 cylinder oil Substances 0.000 claims abstract description 13
- 238000000691 measurement method Methods 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 6
- 230000008054 signal transmission Effects 0.000 claims description 3
- 241001074085 Scophthalmus aquosus Species 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 7
- 239000003818 cinder Substances 0.000 description 4
- 239000002817 coal dust Substances 0.000 description 4
- 238000013459 approach Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000019771 cognition Effects 0.000 description 2
- 230000008451 emotion Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 238000009423 ventilation 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
- E21B3/00—Rotary drilling
- E21B3/02—Surface drives for rotary drilling
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/04—Measuring depth or liquid level
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Geophysics (AREA)
- Earth Drilling (AREA)
Abstract
A kind of device and method for depth of drilling the invention discloses measurable hydraulic drill rig, cylinder oil inlet pipe, guide rail, propelling cylinder, rare-earth magnet, oild chuck, oild chuck oil inlet pipe, close switch, gyrator reduction box and small water are opened including drill bit, drilling rod, clamper, clamper just, the beneficial effects of the invention are as follows：Drill bit drilling machine itself during drilling can accurately record depth of drilling in real time, remember drilling rod quantity and supervision without personnel point, the advance and retreat of drilling rod pass through oild chuck oil inlet pipe pressure, clamper opening side loine pressure, oil cylinder is fed lateral line pressure, oil cylinder retracts lateral line pressure to judge, convenient for record travel values just with it is negative, close to switch using sensing element and singlechip group at, and multiple rare-earth magnets can be incuded and be acquired signal, allow continuously to sense close to switch and records stroke when two rare-earth magnets, small water is just for water flowing of divulging information in boring procedure, punch operation is carried out convenient for worker.
Description
Technical field
The present invention relates to a kind of hydraulic drill rig device, specially a kind of measurable hydraulic drill rig drill depth device and side
Method belongs to mining machinery technical field.
Background technology
The spring tide of Chinese Industrialization coal production history such as great waves formula, is poured into always today, and science and technology is all new with day, wound
New steps are maked rapid progress, and the Fast Growth of Coal Industrial has driven national economy fast development, also redefined Coal Industrial
Brand-new concept --- in the safe and efficient exploitation epoch, in China, we are absorbed in coal mine gas, water hazard prediction, coal seam always
Geological prospecting creates conditions for coal mine downhole safety production, and drilling machine, drill carriage arrange equipment as the main spy of underground coal mine instantly,
Use demand is huge, and drilling hole amount is even more innumerable, and each mine geological conditions is different, and technique of drilling is also different, which results in
The depth of pore forming of technological requirement is different, and mine drill with ferrule fleet is mostly outsourcing at present, and mine root is paid the bill according at hole number and depth, mesh
Before, the measurement of depth of pore forming can only manually put the quantity of note drilling rod, and to record, (i.e. depth of pore forming=drilling rod quantity × drilling rod is long
Degree), need mine side's quality inspection personnel moment to supervise during drilling, and result by human factor it is possible to influenced to occur inclined
Difference.
Invention content
The purpose of the present invention is that providing a kind of measurable hydraulic drill rig to solve the above-mentioned problems drills depth
Device and method.
The present invention is achieved through the following technical solutions above-mentioned purpose：A kind of measurable hydraulic drill rig is drilled the dress of depth
It sets, including drill bit, drilling rod, clamper, clamper open cylinder oil inlet pipe, guide rail, propelling cylinder, rare-earth magnet, oild chuck, liquid
Press chuck oil inlet pipe, close switch, gyrator reduction box and small water just；The drill bit is mounted on drilling rod front end, and the drilling rod is logical
It crosses clamper and oild chuck to link together with hydraulic drill rig, the clamper is stuck in the first half of drilling rod, the clamper
Top is connected with clamper and opens cylinder oil inlet pipe, and the guide rail is arranged below drilling rod, and folder is equipped with above the guide rail front end
Holder, the guide rail tail end top are connected with oild chuck, and the propelling cylinder is located at the lower section of guide rail, the rare-earth magnet edge
On guide rail, the oild chuck drives drilling rod to rotate by propelling cylinder, and the oild chuck oil inlet pipe is mounted on hydraulic pressure
Described to be mounted on guide rail close to switch on chuck, described close to the tail end switched positioned at guide rail, the gyrator reduction box is logical
It crosses screw to link together with propelling cylinder, the small water is just mounted on the tail end of drilling rod.
A kind of measurable hydraulic drill rig drill depth device measurement method, measurement method includes the following steps：
Step A drives close in switch propulsion or fall back process in propelling cylinder, is carried out close to inductive switching rare-earth magnet
Signal is acquired, when reaching setting value close to the distance between switch and magnet piece, connection point on-off signal output, when distance is more than
It automatically resets when setting value.
Step B, pressure transmitter detect clamper and open the pressure of cylinder oil inlet pipe, the pressure of oild chuck oil inlet pipe, oil
Cylinder promotes lateral line pressure, oil cylinder to retract lateral line pressure to judge the propulsion of drilling rod and retract, i.e., record travel values are being just
With it is negative.
Step C, by close to the signal transmission of switch, pressure transmitter acquisition to microcontroller, microcontroller is according to set input
Logic carry out judging that the positive and negative of stroke, accumulated value are depth of pore forming.
Preferably, in order to remove personnel point note drilling rod quantity and supervision from, drilling machine itself can during drilling for the drill bit
It is accurate to record depth of drilling in real time.
Preferably, for the ease of record travel values just with it is negative, the advance and retreat of the drilling rod pass through oild chuck oil inlet pipe
Road pressure, clamper opening side loine pressure, oil cylinder feed lateral line pressure, oil cylinder retract lateral line pressure to judge.
Preferably, stroke is recorded when two rare-earth magnets in order to allow continuously to sense close to switch, described approach is opened
It closes using sensing element and singlechip group at and multiple rare-earth magnets capable of being incuded and be acquired signal.
Preferably, in order to which cinder coal dust in hole to be discharged, the small water is just for water flowing of divulging information in boring procedure.
The beneficial effects of the invention are as follows：This can measure hydraulic drill rig and drills the device and method reasonable design of depth, drill bit
Drilling machine itself can accurately record depth of drilling in real time during drilling, and without personnel point note drilling rod quantity and supervision, avoid
Manual intervention ensure that the accuracy of result, precision fully meet mine side's demand in ± 100mm, reduce cost of labor and when
Between cost, the advance and retreat of drilling rod pass through oild chuck oil inlet pipe pressure, clamper opening side loine pressure, oil cylinder and are fed lateral line
Pressure, oil cylinder retract lateral line pressure to judge, convenient for record travel values just with it is negative, the result for the depth that prevents from drilling is by a
There is deviation in the cognition of people and emotion influence, close to switch using sensing element and singlechip group at and capable of incuding multiple dilute
Native magnet is acquired signal, has the characteristics that stronger anti-interference ability, service life length, high sensitivity, reaction speed are fast,
Allow continuously to sense close to switch and record stroke when two rare-earth magnets, small water is just logical for divulging information in boring procedure
Water, as drilling depth is constantly deepened, just cinder coal dust in hole can be discharged for small water, and punch operation is carried out convenient for worker.
Description of the drawings
Fig. 1 is schematic structural view of the invention；
In figure：1, drill bit, 2, drilling rod, 3, clamper, 4, clamper open cylinder oil inlet pipe, 5, guide rail, 6, propelling cylinder, 7,
Rare-earth magnet, 8, oild chuck, 9, oild chuck oil inlet pipe, 10, close to switch, 11, gyrator reduction box and 12, small water are just.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The device of depth referring to Fig. 1, a kind of measurable hydraulic drill rig is drilled, including drill bit 1, drilling rod 2, clamper 3, folder
Holder opens cylinder oil inlet pipe 4, guide rail 5, propelling cylinder 6, rare-earth magnet 7, oild chuck 8, oild chuck oil inlet pipe 9, approaches and open
Close 10, gyrator reduction box 11 and small water just 12；The drill bit 1 is mounted on 2 front end of drilling rod, and the drilling rod 2 passes through 3 He of clamper
Oild chuck 8 links together with hydraulic drill rig, and the clamper 3 is stuck in the first half of drilling rod 2, and 3 top of the clamper connects
It is connected to clamper and opens cylinder oil inlet pipe 4, the guide rail 5 is arranged below drilling rod 2, and clamping is equipped with above 5 front end of the guide rail
Device 3,5 tail end of guide rail top are connected with oild chuck 8, and the propelling cylinder 6 is located at the lower section of guide rail 5, the Rare-Earth Magnetic
Iron 7 is embedded on guide rail 5, and the oild chuck 8 drives drilling rod 2 to rotate by propelling cylinder 6, the oild chuck oil inlet pipe 9
It is described to be mounted on guide rail 5 close to switch 10 on oild chuck 8, the tail end that guide rail 5 is located at close to switch 10,
The gyrator reduction box 11 is linked together by screw and propelling cylinder 6, the small water just 12 be mounted on drilling rod 2 tail
End.
A kind of measurable hydraulic drill rig drill depth device measurement method, measurement method includes the following steps：
Step A drives close in the propulsion of switch 10 or fall back process in propelling cylinder, incudes rare-earth magnet close to switch 10
7 are acquired signal, when reaching setting value close to the distance between switch 10 and magnet piece, the output of connection point on-off signal, when
It automatically resets when distance is greater than the set value.
Step B, pressure transmitter detect clamper open the pressure of cylinder oil inlet pipe 4, the pressure of oild chuck oil inlet pipe 9,
Oil cylinder promotes lateral line pressure, oil cylinder to retract lateral line pressure to judge the propulsion of drilling rod 2 and retract, i.e. record travel values
Just with it is negative.
Step C, by the signal transmission acquired close to switch 10, pressure transmitter to microcontroller, microcontroller is according to set defeated
The logic entered carries out judging that the positive and negative of stroke, accumulated value are depth of pore forming.
The drilling machine itself during drilling of the drill bit 1 can accurately record depth of drilling in real time, remember drilling rod without personnel point
Quantity and supervision, avoid manual intervention, ensure that the accuracy of result, precision fully meet mine side's demand in ± 100mm,
Cost of labor and time cost are reduced, the advance and retreat of the drilling rod 2 are opened by 8 oil inlet pipe pressure of oild chuck, clamper 3
Lateral line pressure, oil cylinder feed lateral line pressure, oil cylinder retract lateral line pressure to judge, convenient for record travel values just with
Negative, is there is deviation by personal cognition and emotion influence in the result for the depth that prevents from drilling, described first using induction close to switch 10
Part and singlechip group are at and capable of incuding multiple rare-earth magnets 7 and be acquired signal, have stronger anti-interference ability, use
The features such as long lifespan, high sensitivity, fast reaction speed, allows to approach when switch 10 continuously senses two rare-earth magnets 7 and remember
Record stroke, the small water just 12 in boring procedure for divulging information water flowing, as drilling depth is constantly deepened, small water just 12 can
Cinder coal dust in hole is discharged, punch operation is carried out convenient for worker.
The course of work：Using this can measure hydraulic drill rig drill depth device when, oild chuck oil inlet pipe 9 enters high
Drilling rod 2 is held in pressure oil, 8 clamping of oild chuck tightly, and clamper opens cylinder oil inlet pipe 4 and enters high pressure oil, and clamper 3 is opened, and is unclamped and is bored
Bar 2, the at this moment drive of oild chuck 9 drilling rod revolution, propelling cylinder drive gyrator reduction box 11, close switch 10 and drilling rod 2 suitable
Guide rail 5 to push ahead.After being pushed into oil cylinder terminal, oild chuck stops revolution, and clamper is opened cylinder oil inlet pipe 4 and stopped into high
Pressure oil, clamper 3 clamp, and 9 oil inlet pipe of oild chuck stops entering high pressure oil, and oild chuck 8 unclamps, at this moment 6 band of propelling cylinder
Dynamic gyrator reduction box 11 is retracted backward close to 10 follows track 5 of switch, and after retreating to beginning, an action of drilling terminates.It repeats
The above action, even if drilling depth is constantly deepened, small water just 12 is that water flowing and ventilation are used, for cinder coal dust in tap, when
When needing continued access drilling rod, small water just 12 need to be laid down, from rear end continued access.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Profit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent requirements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiment being appreciated that.
Claims (6)
- The device of depth 1. a kind of measurable hydraulic drill rig is drilled, it is characterised in that：Including drill bit (1), drilling rod (2), clamper (3), clamper opens cylinder oil inlet pipe (4), guide rail (5), propelling cylinder (6), rare-earth magnet (7), oild chuck (8), hydraulic pressure card Disk oil inlet pipe (9), close switch (10), gyrator reduction box (11) He little Shui are just (12)；The drill bit (1) is mounted on drilling rod (2) front end, the drilling rod (2) are linked together by clamper (3) and oild chuck (8) with hydraulic drill rig, the clamper (3) it is stuck in the first half of drilling rod (2), clamper is connected with above the clamper (3) and opens cylinder oil inlet pipe (4), the guide rail (5) setting is equipped with clamper (3), connects above guide rail (5) tail end below drilling rod (2) above guide rail (5) front end It is connected to oild chuck (8), the propelling cylinder (6) is located at the lower section of guide rail (5), and the rare-earth magnet (7) is embedded in guide rail (5) On, the oild chuck (8) drives drilling rod (2) to rotate by propelling cylinder (6), and the oild chuck oil inlet pipe (9) is mounted on It is described to be mounted on guide rail (5) close to switch (10) on oild chuck (8), the tail that guide rail (5) is located at close to switch (10) End, the gyrator reduction box (11) are linked together by screw and propelling cylinder (6), and just (12) are mounted on brill to the small water The tail end of bar (2).
- The measurement method of the device of depth 2. a kind of measurable hydraulic drill rig is drilled, which is characterized in that its measurement method include with Lower step：Step A drives close in switch (10) propulsion or fall back process in propelling cylinder, incudes rare-earth magnet close to switch (10) (7) it is acquired signal, when reaching setting value close to switch the distance between (10) and magnet piece, connection point on-off signal is defeated Go out, automatically resets when distance is greater than the set value；Step B, pressure transmitter detect clamper open cylinder oil inlet pipe (4) pressure, the pressure of oild chuck oil inlet pipe (9), Oil cylinder promotes lateral line pressure, oil cylinder to retract lateral line pressure to judge the propulsion of drilling rod (2) and retract, that is, records travel values Just with it is negative；Step C, will be close to the signal transmission that switch (10), pressure transmitter acquire to microcontroller, and microcontroller is according to set input Logic carry out judging that the positive and negative of stroke, accumulated value are depth of pore forming.
- The device of depth 3. a kind of measurable hydraulic drill rig according to claim 1 is drilled, it is characterised in that：The drill bit (1) drilling machine itself can accurately record depth of drilling in real time during drilling.
- The device of depth 4. a kind of measurable hydraulic drill rig according to claim 1 is drilled, it is characterised in that：The drilling rod (2) advance and retreat are fed lateral line pressure by oild chuck (8) oil inlet pipe pressure, clamper (3) opening side loine pressure, oil cylinder Power, oil cylinder retract lateral line pressure to judge.
- The device of depth 5. a kind of measurable hydraulic drill rig according to claim 1 is drilled, it is characterised in that：It is described close Switch (10) using sensing element and singlechip group at.
- The device of depth 6. a kind of measurable hydraulic drill rig according to claim 1 is drilled, it is characterised in that：The small water Just (12) are used for water flowing of divulging information in boring procedure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810349609.8A CN108343375A (en) | 2018-04-18 | 2018-04-18 | A kind of measurable hydraulic drill rig is drilled the device and method of depth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810349609.8A CN108343375A (en) | 2018-04-18 | 2018-04-18 | A kind of measurable hydraulic drill rig is drilled the device and method of depth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108343375A true CN108343375A (en) | 2018-07-31 |
Family
ID=62954896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810349609.8A Pending CN108343375A (en) | 2018-04-18 | 2018-04-18 | A kind of measurable hydraulic drill rig is drilled the device and method of depth |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108343375A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109113600A (en) * | 2018-09-26 | 2019-01-01 | 浙江杭钻能源装备有限公司 | Continuous stepless drilling rod drill pipe rack and its control method |
| CN109322658A (en) * | 2018-12-20 | 2019-02-12 | 河北欧登塞科技有限公司 | A kind of drilling depth measuring device and method |
| CN109719323A (en) * | 2019-03-07 | 2019-05-07 | 大连大学 | A kind of High-efficiency mesh drilling new method |
| CN109854190A (en) * | 2019-04-23 | 2019-06-07 | 安徽理工大学 | Drilling auto counter device and application method for hydraulic feed structure drilling machine |
| CN109930581A (en) * | 2019-04-19 | 2019-06-25 | 武汉吉欧信海洋科技股份有限公司 | A kind of static sounding device with casing function and continuous injection construction technology |
| CN111075366A (en) * | 2019-12-05 | 2020-04-28 | 中煤科工集团西安研究院有限公司 | Device and method for post-centralizing drill rod of tunnel drilling rig and automatically loading and unloading water |
| CN113565453A (en) * | 2021-08-13 | 2021-10-29 | 王超 | Resistance induction drill rod pushing device |
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| CN208280893U (en) * | 2018-04-18 | 2018-12-25 | 冀凯河北机电科技有限公司 | A kind of measurable hydraulic drill rig is drilled the device of depth |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109113600A (en) * | 2018-09-26 | 2019-01-01 | 浙江杭钻能源装备有限公司 | Continuous stepless drilling rod drill pipe rack and its control method |
| CN109322658A (en) * | 2018-12-20 | 2019-02-12 | 河北欧登塞科技有限公司 | A kind of drilling depth measuring device and method |
| CN109322658B (en) * | 2018-12-20 | 2024-06-11 | 河北欧登塞科技有限公司 | Drilling depth measuring equipment and method |
| CN109719323A (en) * | 2019-03-07 | 2019-05-07 | 大连大学 | A kind of High-efficiency mesh drilling new method |
| CN109930581A (en) * | 2019-04-19 | 2019-06-25 | 武汉吉欧信海洋科技股份有限公司 | A kind of static sounding device with casing function and continuous injection construction technology |
| CN109930581B (en) * | 2019-04-19 | 2024-02-23 | 武汉吉欧信海洋科技股份有限公司 | Static sounding device with sleeve function and continuous penetrating construction process |
| CN109854190A (en) * | 2019-04-23 | 2019-06-07 | 安徽理工大学 | Drilling auto counter device and application method for hydraulic feed structure drilling machine |
| CN109854190B (en) * | 2019-04-23 | 2024-02-13 | 安徽理工大学 | Method for using automatic length measuring device for drilling of hydraulic feeding structure drilling machine |
| CN111075366A (en) * | 2019-12-05 | 2020-04-28 | 中煤科工集团西安研究院有限公司 | Device and method for post-centralizing drill rod of tunnel drilling rig and automatically loading and unloading water |
| CN113565453A (en) * | 2021-08-13 | 2021-10-29 | 王超 | Resistance induction drill rod pushing device |
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Application publication date: 20180731 |