CN114278241B - Sleeve type coring reamer based on hydraulic drive for deep mining of coal mine - Google Patents
Sleeve type coring reamer based on hydraulic drive for deep mining of coal mine Download PDFInfo
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- CN114278241B CN114278241B CN202111650920.4A CN202111650920A CN114278241B CN 114278241 B CN114278241 B CN 114278241B CN 202111650920 A CN202111650920 A CN 202111650920A CN 114278241 B CN114278241 B CN 114278241B
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- 239000003245 coal Substances 0.000 title claims abstract description 57
- 238000005065 mining Methods 0.000 title claims abstract description 20
- 238000005070 sampling Methods 0.000 claims abstract description 81
- 230000007306 turnover Effects 0.000 claims description 5
- 244000208734 Pisonia aculeata Species 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 210000000078 claw Anatomy 0.000 description 10
- 230000006872 improvement Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Abstract
The invention relates to the technical field of coal mining, in particular to a sleeve type coring reamer for deep mining of a coal mine based on hydraulic driving. The device comprises a protection device and a sampling device which is arranged inside the protection device in a sliding manner, wherein a linkage device is arranged between the protection device and the sampling device, and a plurality of positioning devices are arranged at the bottom of the protection device. When the device needs to sample, the cone plate is turned around and opened and embedded in the coal seam, so that the position of the protecting device is fixed, the sampling device can rotate in the protecting device to sample coal, the situation that the position between the protecting device and the sampling device is positioned by installing a clamping block for positioning the position of the sampling device at the top of the protecting device when the sampling device rotates is avoided, the coal cannot be sampled by the sampling device in the moving process of the protecting device, the accuracy of coal sampling is ensured, and the sampling effect of the device is improved.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a sleeve type coring reamer for deep mining of a coal mine based on hydraulic driving.
Background
The invention discloses a coring reamer with a patent number of CN109184607A, which comprises an inner sleeve, an outer sleeve and a core claw, wherein the inner sleeve and the outer sleeve are connected in a sliding manner, an upper limit and a lower limit are arranged between the inner sleeve and the outer sleeve, a connector is arranged at the upper end of the inner sleeve, a drill bit is arranged at the lower end of the outer sleeve, the core claw comprises a plurality of claw pieces along the circumferential direction of the inner sleeve, the upper ends of the claw pieces are fixedly connected to the inner wall of the outer sleeve, a fixed point of the claw pieces is positioned between the inner sleeve and the outer sleeve, the claw pieces are spring pieces, when the claw pieces are in a natural state, the claw pieces are arc-shaped curved towards the center of the inner sleeve, when the outer sleeve is positioned at the upper limit position, all claw pieces are in a natural state, and when the outer sleeve is positioned at the lower limit position, all claw pieces are completely positioned between the inner sleeve and the outer sleeve. The invention plays a role in cutting coal pillars left and right when lifting the drill, and plays a role in avoiding coal pillars from leaking after cutting is completed, and is simple and practical.
The invention can not locate between the outer sleeve and the inner sleeve in the moving process, the outer sleeve can move to the bottom of the inner sleeve, the moving space can be occupied in the moving process, the device is inconvenient to move in a narrow space, and the outer sleeve is in direct contact with the ground in the using process, the locating effect is poor, and the outer sleeve and the inner sleeve synchronously rotate in the rotating process of the inner sleeve, so that the coal taking effect of the device is affected.
Disclosure of Invention
The invention aims to provide a sleeve type coring reamer for deep mining of a coal mine based on hydraulic driving so as to solve the problems in the background art.
In order to achieve the above-mentioned purpose, provide the deep mining of colliery based on hydraulic drive and use telescopic coring reamer, including protection device and slip setting at the inside sampling device of protection device, be provided with aggregate unit between protection device and the sampling device, protection device's bottom is provided with a plurality of positioner, protection device includes the inside hollow registration tube that is, sampling device is including the slip setting at the inside sampling tube of registration tube, the upper end of sampling tube is provided with the hydraulic stem that is used for driving sampling device to remove, the thread groove has been seted up to central symmetry on the inside wall of registration tube, the central symmetry is fixed with the slippin on the lateral wall that the sampling tube is close to the upper end, the slippin slides and sets up the inside at the thread groove, positioner includes the taper plate and fixes the hinge plate in the taper plate upper end, a plurality of taper plate combination forms a toper, annular arrangement has seted up a plurality of flip groove on the lateral wall of registration tube bottom, the hinge plate articulates in the inside of flip groove, the upside of hinge plate is provided with the locating plate that is L shape, aggregate unit includes on the lateral wall of last annular ring and the side of last annular ring and fixed ring, a plurality of fixed ring and fixed ring are arranged on the fixed ring bottom the fixed ring, the fixed ring is arranged on the fixed ring and the fixed ring has the fixed bottom that the fixed ring is contacted on the fixed ring.
As a further improvement of the technical scheme, a chute is formed in the positioning pipe at the upper side of the overturning groove, the positioning plate is arranged in the abutting block in a sliding mode, and a spring is fixed on the side wall between the positioning plate and the abutting block.
As a further improvement of the technical scheme, a clamping groove is formed in the position between the turnover groove and the sliding groove, which is close to the inner side wall, one end of the positioning plate is inserted into the clamping groove, and one side of the positioning plate is contacted with one side of the hinge plate.
As a further improvement of the technical scheme, a circular moving groove is formed in the positioning pipe at the upper side of the sliding groove, the moving ring is rotatably arranged in the moving groove, and the moving ring slides up and down in the moving groove.
As a further improvement of the technical scheme, an upper mounting groove is formed in the top of the positioning tube, a plurality of arc-shaped through grooves are annularly arranged between the upper mounting groove and the moving groove, the upper ring is arranged in the upper mounting groove, and the driving column is arranged in the through grooves.
As a further improvement of the technical scheme, a plurality of arc blocks are annularly arranged and fixed on the inner wall of the upper ring, a clamping block is arranged at one end of each arc block, and one end of each clamping block penetrates through the side wall of the positioning tube and is inserted into the side wall of the sampling tube.
As a further improvement of the technical scheme, a plurality of clamping plates are annularly arranged and fixed at the top of the positioning tube, and a pull-back spring is fixedly connected between one end of each clamping plate and each clamping block.
As a further improvement of the technical scheme, arc toothed plates which are arc-shaped are fixedly arranged on the upper ring in an annular arrangement mode, driving gears are meshed on the arc toothed plates, and a driving motor for driving the driving gears to rotate is arranged on one side of each driving gear.
As a further improvement of the technical scheme, the top screw of the positioning tube is connected with an annular upper guard plate, one end of the piston rod of the hydraulic rod penetrates through the middle part of the upper guard plate and is rotationally connected with the sampling tube, and the screw of the driving motor is connected with the upper guard plate.
As a further improvement of the technical scheme, a plurality of guide plates which are obliquely arranged are annularly arranged and fixed at the bottom of the sampling tube, and a thread plate is fixed at the position, close to the bottom, of the sampling tube.
Compared with the prior art, the invention has the beneficial effects that:
1. in this deep mining of colliery based on hydraulic drive uses telescopic coring reamer, the awl board of setting is when the device needs the sample, turns over around and opens, inlays and establishes in the coal seam, makes protection device's position fixed to sampling device is rotatory in protection device's inside to take a sample coal, avoids sampling device when rotatory, and protection device follows the rotatory condition of sampling device, improves the effect of sampling device to the coal sample.
2. In this deep mining of colliery based on hydraulic drive uses telescopic coring reamer, through fixing a position between protection device and the sampling device at the fixture block that the protection device's top installation was fixed a position, make the device at the in-process that removes, protection device can not remove on the sampling device, the space that occupies when reducing the device and remove, when the device drills the hole in the coal seam simultaneously, the position between protection device and the sampling device is fixed, make sampling device can not take a sample to coal in-process that protection device removed, guarantee the accuracy of coal sampling, improve the effect of device sampling.
3. This deep mining of colliery is with telescopic coring reamer, rotate through driving motor control drive gear, make aggregate unit carry out synchronous regulation and control to positioner and sampling device, when last ring rotation, sampling device is rotatory in protection device's inside, the outside upset of taper plate simultaneously, rotatory sampling device moves down, promote the taper plate, help the upset of taper plate, so that quick position location with protection device, guarantee sampling device when the sample, the stability of protection device position, make sampling device stretch out protection device simultaneously and take a sample to the coal seam of protection device bottom, the accuracy of coal sample sampling has been guaranteed.
4. In this deep mining sleeve-type coring reamer of colliery based on hydraulic drive, make up into a toper through a plurality of taper plate, make the device before the sample layer of coal, carry out the awl thorn to the coal seam, make the device form a passageway in coal, make things convenient for the multiple sampling of passageway, the taper plate that makes up together simultaneously stops coal, avoids outside coal to enter into sampling device in, guarantees the accuracy of the data of coal sample.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a second schematic diagram of the overall structure of the present invention;
FIG. 3 is a schematic overall cross-sectional view of the present invention;
FIG. 4 is a schematic view of the overall structure of the present invention, partially in section;
FIG. 5 is a schematic cross-sectional view of the protection device of the present invention;
FIG. 6 is a schematic cross-sectional view of a sampling device according to the present invention;
FIG. 7 is a schematic view of a positioning device according to the present invention;
FIG. 8 is a schematic diagram of a combined sampling device and linkage assembly of the present invention;
FIG. 9 is a schematic view of a positioning device and linkage assembly of the present invention;
fig. 10 is a schematic view of the linkage structure of the present invention.
The meaning of each reference sign in the figure is:
1. a protection device; 11. a positioning tube; 12. a thread groove; 13. a turnover groove; 14. a chute; 15. a clamping groove; 16. a moving groove; 17. a through groove; 18. an upper mounting groove; 19. a clamping plate;
2. a sampling device; 21. a sampling tube; 22. a slide pin; 23. a thread plate;
3. a positioning device; 31. a cone plate; 32. a hinge plate; 33. a positioning plate; 34. a spring;
4. a linkage; 41. a ring is arranged; 411. an arc block; 42. a moving ring; 43. driving the column; 44. abutting blocks; 45. arc toothed plates; 46. a driving motor; 47. a drive gear; 48. a pull-back spring; 49. a clamping block;
5. a hydraulic rod;
6. and (5) an upper guard board.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Example 1
Referring to fig. 1-10, the present embodiment is aimed at providing a sleeve-type coring reamer for deep mining of coal mine based on hydraulic driving, which comprises a protecting device 1 and a sampling device 2 slidably arranged in the protecting device 1, wherein a linkage device 4 is arranged between the protecting device 1 and the sampling device 2, a plurality of positioning devices 3 are arranged at the bottom of the protecting device 1, the protecting device 1 comprises a positioning tube 11 with a hollow inside, the sampling device 2 comprises a sampling tube 21 slidably arranged in the positioning tube 11, the upper end of the sampling tube 21 is provided with a hydraulic rod 5 for driving the sampling device 2 to move, a thread groove 12 is symmetrically arranged on the inner side wall of the positioning tube 11, a sliding pin 22 is symmetrically fixed on the side wall of the sampling tube 21 close to the upper end, the sliding pin 22 is slidably arranged in the thread groove 12, and the sampling tube 21 rotates in the protecting device 1 to sample coal through the movement of the sliding pin 22 in the thread groove 12 in the downward moving process;
the positioning device 3 comprises a conical plate 31 and a hinge plate 32 fixed at the upper end of the conical plate 31, a plurality of conical plates 31 are combined to form a cone shape, a plurality of overturning grooves 13 are formed in an annular arrangement on the side wall of the bottom of the positioning tube 11, the hinge plate 32 is hinged in the overturning grooves 13, an L-shaped positioning plate 33 is arranged on the upper side of the hinge plate 32, a clamping groove 15 is formed between the overturning grooves 13 and the sliding grooves 14 and close to the inner side wall, one end of the positioning plate 33 is inserted in the clamping groove 15, one side of the positioning plate 33 is contacted with one side of the hinge plate 32, the position of the hinge plate 32 is fixed through the blocking of the positioning plate 33 to ensure that the conical plate 31 forms a cone shape when the conical plate 31 does not need to be opened for positioning, and coal is drilled;
the linkage device 4 comprises an upper ring 41 and a movable ring 42 arranged at the bottom of the upper ring 41, wherein a plurality of driving columns 43 are fixedly connected to the bottom of the upper ring 41 in an annular arrangement manner, one ends of the driving columns 43 are slidably inserted on the movable ring 42, a plurality of supporting blocks 44 are fixedly arranged at the bottom of the movable ring 42 in an annular arrangement manner, and the bottoms of the supporting blocks 44 are contacted with the upper side of the positioning plate 33;
an arc toothed plate 45 with an arc shape is annularly arranged and fixed on the upper ring 41, a driving gear 47 is meshed on the arc toothed plate 45, and a driving motor 46 for driving the driving gear 47 to rotate is arranged on one side of the driving gear 47;
a plurality of arc blocks 411 are annularly arranged and fixed on the inner wall of the upper ring 41, clamping blocks 49 are arranged at one ends of the arc blocks 411, one ends of the clamping blocks 49 penetrate through the side wall of the positioning tube 11 and are inserted into the side wall of the sampling tube 21, a plurality of clamping plates 19 are annularly arranged and fixed on the top of the positioning tube 11, and a pull-back spring 48 is fixedly connected between one ends of the clamping plates 19 and the clamping blocks 49.
When the sampling device 2, the positioning device 3 and the linkage device 4 are used, the device is moved to a designated coal sampling point, one end of the hydraulic rod 5 is fixed after the device is moved to the sampling point, a piston rod on the hydraulic rod 5 extends downwards to drive the protection device 1, the sampling device 2, the positioning device 3 and the linkage device 4 to extend into coal, and at the moment, if the cone formed by the cone plates 31 is used for drilling the coal, the difficulty of entering the coal by the device is reduced, and the coal is accelerated;
when the device is positioned at a specified position, the rotating shaft of the driving motor 46 rotates to drive the driving gear 47 to rotate, the driving gear 47 drives the upper ring 41 to rotate through meshing with the arc toothed plate 45, the rotating upper ring 41 drives the driving post 43 to drive the movable ring 42 to rotate, the rotating movable ring 42 drives the abutting block 44 to be separated from the positioning plate 33, the positioning plate 33 is pushed by the spring 34 to separate one side of the positioning plate 33 from one side of the hinge plate 32, at the moment, the cone plate 31 is overturned outwards through the resistance of coal to the cone plate 31, the cone plate 31 is penetrated into the coal, and the position of the protection device 1 is positioned;
in the process of rotating the upper ring 41, the upper ring 41 drives the arc block 411 to rotate, so that the clamping block 49 slides on one side of the arc block 411, the clamping block 49 leaves the arc block 411, at the moment, one end of the clamping block 49 is separated from the sampling pipe 21, a piston rod of the hydraulic rod 5 drives the sampling device 2 to move downwards, the sliding pin 22 slides in the thread groove 12, the sampling pipe 21 rotates in the positioning pipe 11, and the rotating sampling device 2 stretches out of the protection device 1 to collect coal.
In order to make the movable ring 42 stably contact and separate from the positioning plate 33 in the moving process, the inside of the positioning tube 11 at the upper side of the turnover groove 13 is provided with the sliding groove 14, the positioning plate 33 is slidably arranged in the abutting block 44, the side wall between the positioning plate 33 and the abutting block 44 is fixedly provided with the spring 34, the positioning tube 11 at the upper side of the sliding groove 14 is provided with the annular movable groove 16, the movable ring 42 is rotatably arranged in the movable groove 16, the movable ring 42 slides up and down in the movable groove 16, and when the upper ring 41 rotates, the movable ring 42 is driven to rotate in the driving column 43, so that the driving column 43 drives the movable ring 42 to synchronously rotate along with the upper ring 41, the rotating movable ring 42 rotates in the movable groove 16, the abutting block 44 moves along with the movable ring 42, so that the abutting block 44 is separated from the positioning plate 33, and at the moment, the spring 34 jacks up the positioning plate 33 and one side of the hinge plate 32 are separated, so that the hinge plate 32 rotates in the turnover groove 13, the cone plate 31 is conveniently turned into the coal seam, and the position of the protection device 1 is conveniently positioned.
In order to limit the moving position of the driving post 43, the driving post 43 is guaranteed to drive the moving ring 42 to stably move, an upper mounting groove 18 is formed in the top of the positioning tube 11, a plurality of arc-shaped through grooves 17 are annularly arranged between the upper mounting groove 18 and the moving groove 16, an upper ring 41 is arranged in the upper mounting groove 18, the driving post 43 is arranged in the through grooves 17, the position of the driving post 43 is limited through the through grooves 17, when the driving post 43 is driven to rotate by the upper ring 41, the moving ring 42 is driven to rotate at a fixed angle, the separation of the abutting block 44 and the positioning plate 33 is guaranteed, and accordingly the separation of the positioning plate 33 and the hinge plate 32 is guaranteed, so that the positioning device 3 is convenient to position the protection device 1.
In order to facilitate the driving of the linkage device 4 by the driving motor 46, the annular upper guard plate 6 is connected with the top screw of the positioning tube 11, one end of a piston rod of the hydraulic rod 5 penetrates through the middle of the upper guard plate 6 and is rotationally connected with the sampling tube 21, the driving motor 46 is connected with the upper guard plate 6 by the screw, the driving motor 46 is positioned through the upper guard plate 6, the driving motor 46 is convenient to drive the driving gear 47, the driving gear 47 drives the driving motor 46 to rotate, so that the linkage device 4 can control the opening of the positioning device 3 and the movement of the position of the sampling device 2, and the stable sampling of coal by the device is ensured.
For the convenience sampling device 2 is to the sampling of coal, the bottom annular arrangement of sampling tube 21 is fixed with the baffle that a plurality of slope set up, guide the coal when rotatory through the baffle that the slope set up, drive coal and remove to the inside, the collection of being convenient for coal, the sampling tube 21 is close to the position that the bottom is fixed with screw thread board 23, twist the coal through the screw thread board 23 that sets up, make coal gather to the inside of sampling tube 21, and after the coal sampling finishes, stop the coal of sampling tube 21 through screw thread board 23, avoid the coal in the sampling tube 21 to drop, guarantee the stability of the coal that is sampled.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. Sleeve formula coring reamer is used in deep mining of colliery based on hydraulic drive, including protection device (1) and slip setting at inside sampling device (2) of protection device (1), be provided with aggregate unit (4) between protection device (1) and sampling device (2), the bottom of protection device (1) is provided with a plurality of positioner (3), protection device (1) is including inside hollow registration arm (11), sampling device (2) are including sliding setting up in inside sampling tube (21) of registration arm (11), the upper end of sampling tube (21) is provided with hydraulic stem (5) that are used for driving sampling device (2) to remove, thread groove (12) have been seted up to central symmetry on the inside wall of registration arm (11), central symmetry is fixed with slide pin (22) on the lateral wall that sampling tube (21) are close to the upper end, slide pin (22) slide the inside of setting in thread groove (12), its characterized in that: the positioning device (3) comprises a conical plate (31) and a hinged plate (32) fixed at the upper end of the conical plate (31), a plurality of conical plates (31) are combined to form a cone shape, a plurality of overturning grooves (13) are formed in an annular arrangement on the side wall of the bottom of the positioning tube (11), the hinged plate (32) is hinged in the overturning grooves (13), an L-shaped positioning plate (33) is arranged on the upper side of the hinged plate (32), the linkage device (4) comprises an upper ring (41) and a movable ring (42) arranged at the bottom of the upper ring (41), a plurality of driving columns (43) are fixedly connected to the bottom of the upper ring (41) in an annular arrangement, one ends of the driving columns (43) are slidably inserted on the movable ring (42), a plurality of supporting blocks (44) are fixedly arranged on the bottom of the movable ring (42) in an annular arrangement, and the bottoms of the supporting blocks (44) are contacted with the upper side of the positioning plate (33); a chute (14) is formed in the positioning tube (11) at the upper side of the turnover groove (13), the positioning plate (33) is arranged in the supporting block (44) in a sliding manner, and a spring (34) is fixed on the side wall between the positioning plate (33) and the supporting block (44);
clamping grooves (15) are formed in positions, close to the inner side walls, between the overturning grooves (13) and the sliding grooves (14), one ends of the positioning plates (33) are inserted into the clamping grooves (15), one sides of the positioning plates (33) and one sides of the hinge plates (32) are in contact with the positioning pipes (11) on the upper sides of the sliding grooves (14), annular moving grooves (16) are formed in the positioning pipes (11) on the upper sides of the sliding grooves (14), the moving rings (42) are rotatably arranged in the moving grooves (16), and the moving rings (42) slide up and down in the moving grooves (16).
2. A hydraulically driven telescopic coring reamer for deep mining of coal mines as set forth in claim 1, wherein: an upper mounting groove (18) is formed in the top of the positioning tube (11), a plurality of arc-shaped through grooves (17) are annularly arranged between the upper mounting groove (18) and the moving groove (16), an upper ring (41) is arranged in the upper mounting groove (18), and a driving column (43) is arranged in the through grooves (17).
3. A hydraulically driven telescopic coring reamer for deep mining of coal mines as set forth in claim 1, wherein: a plurality of arc blocks (411) are annularly arranged and fixed on the inner wall of the upper ring (41), clamping blocks (49) are arranged at one ends of the arc blocks (411), and one ends of the clamping blocks (49) penetrate through the side wall of the positioning tube (11) and are inserted into the side wall of the sampling tube (21).
4. A hydraulically driven telescopic coring reamer for deep mining of coal mines as set forth in claim 1, wherein: the top annular arrangement of registration arm (11) is fixed with a plurality of cardboard (19), fixedly connected with pullback spring (48) between one end of cardboard (19) and fixture block (49).
5. A hydraulically driven telescopic coring reamer for deep mining of coal mines as set forth in claim 1, wherein: an arc toothed plate (45) which is arc-shaped is fixedly arranged on the upper ring (41), a driving gear (47) is meshed on the arc toothed plate (45), and a driving motor (46) for driving the driving gear (47) to rotate is arranged on one side of the driving gear (47).
6. A hydraulically driven telescopic coring reamer for deep mining of coal mines as set forth in claim 5, wherein: the top screw connection of registration arm (11) has and is annular backplate (6), the position and the sampling tube (21) rotation connection in backplate (6) middle part are run through to the one end of hydraulic rod (5) piston rod, driving motor (46) screw connection is on backplate (6).
7. A hydraulically driven telescopic coring reamer for deep mining of coal mines as set forth in claim 1, wherein: the bottom of the sampling tube (21) is annularly arranged and fixed with a plurality of guide plates which are obliquely arranged, and a thread plate (23) is fixed at the position of the sampling tube (21) close to the bottom.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111650920.4A CN114278241B (en) | 2021-12-30 | 2021-12-30 | Sleeve type coring reamer based on hydraulic drive for deep mining of coal mine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111650920.4A CN114278241B (en) | 2021-12-30 | 2021-12-30 | Sleeve type coring reamer based on hydraulic drive for deep mining of coal mine |
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| CN114278241A CN114278241A (en) | 2022-04-05 |
| CN114278241B true CN114278241B (en) | 2023-11-24 |
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| CN114855750A (en) * | 2022-04-11 | 2022-08-05 | 刘芳业 | Hydraulic engineering foundation detection method |
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