CN116378598B - Polyurethane long-distance quick fixed-point hole sealing device and method for underground coal mine drilling - Google Patents
Polyurethane long-distance quick fixed-point hole sealing device and method for underground coal mine drilling Download PDFInfo
- Publication number
- CN116378598B CN116378598B CN202310372112.9A CN202310372112A CN116378598B CN 116378598 B CN116378598 B CN 116378598B CN 202310372112 A CN202310372112 A CN 202310372112A CN 116378598 B CN116378598 B CN 116378598B
- Authority
- CN
- China
- Prior art keywords
- pipe
- fixedly connected
- polyurethane
- blocks
- fixed
- 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.)
- Active
Links
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 88
- 239000004814 polyurethane Substances 0.000 title claims abstract description 88
- 238000007789 sealing Methods 0.000 title claims abstract description 77
- 238000005553 drilling Methods 0.000 title claims abstract description 31
- 239000003245 coal Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 32
- 238000007599 discharging Methods 0.000 claims abstract description 25
- 238000003756 stirring Methods 0.000 claims abstract description 17
- 230000000670 limiting effect Effects 0.000 claims description 33
- 238000005187 foaming Methods 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 20
- 239000002994 raw material Substances 0.000 claims description 19
- 230000002457 bidirectional effect Effects 0.000 claims description 14
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 11
- 239000011496 polyurethane foam Substances 0.000 claims description 11
- 238000003780 insertion Methods 0.000 claims description 7
- 230000037431 insertion Effects 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims 1
- 238000005086 pumping Methods 0.000 abstract description 14
- 238000005065 mining Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229920000742 Cotton Polymers 0.000 description 4
- 239000000284 extract Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000006467 substitution reaction 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms
- B01F27/906—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms with fixed axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
- F16L3/08—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing
- F16L3/10—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing divided, i.e. with two or more members engaging the pipe, cable or protective tubing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
- F16L3/22—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets specially adapted for supporting a number of parallel pipes at intervals
- F16L3/237—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets specially adapted for supporting a number of parallel pipes at intervals for two pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L37/00—Couplings of the quick-acting type
- F16L37/56—Couplings of the quick-acting type for double-walled or multi-channel pipes or pipe assemblies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/50—Mixing mined ingredients and liquid to obtain slurries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Earth Drilling (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a polyurethane long-distance quick fixed-point hole sealing device and method for underground coal mine drilling, and belongs to the field of coal mining. The polyurethane long-distance quick fixed-point hole sealing device for underground drilling of the coal mine comprises a base, wherein the top of the base is fixedly connected with a mixing box, a stirring assembly is arranged in the mixing box, the top of the base is fixedly connected with a pumping pump, the feeding end of the pumping pump is communicated with the mixing box through a feeding pipe, and the discharging end of the pumping pump is communicated with a discharging pipe; according to the invention, through the arrangement of the L-shaped block, the cross rod, the sliding block, the reset spring, the L-shaped rod, the connecting block and the fixing hole, two pipeline joints can be fixed, the phenomenon that the two pipeline joints slide out of the clamping block when being inserted into or pulled out of the connecting pipe is avoided, and the pipeline joints are inserted into or pulled out of the connecting pipe in an electric mode through the arrangement of the air cylinder, the rectangular bar, the rack and the clamping block, so that the replacement efficiency is improved, and the manual strength is reduced.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a polyurethane long-distance quick fixed-point hole sealing device and method for underground coal mine drilling.
Background
In the underground mining and drilling process of a coal mine, gas needs to be controlled, the drilling and hole sealing work is one of the most basic works for controlling the gas of the coal mine, at present, a common hole sealing method is generally a polyurethane hole sealing method, polyurethane hole sealing refers to the steps of mixing polyurethane, pouring the polyurethane into a cotton yarn to directly send the cotton yarn into a rotary hole, and filling the cotton yarn into a polyurethane foaming bag to foam and expand the cotton yarn, so that the hole sealing work is completed.
In the prior art, like chinese application number is CN202220634144.2, provide a colliery is polyurethane long distance quick fixed point hole sealing device for drilling in pit, through being provided with feed mechanism in the inside of feed chamber, utilize feed mechanism's pivot, separate flitch and second servo motor's mutually supporting, accessible control pivot drive separate flitch pivoted number of turns, come control polyurethane raw materials feed amount for polyurethane raw materials ratio is more accurate, has improved polyurethane's foaming effect.
In addition, for example, the Chinese application patent number is CN201610173262.7, and provides a polyurethane long-distance quick fixed-point hole sealing device and method for underground drilling of coal mines, which are connected with an underground air-pressing system through an air-pressing connecting pipe with a third valve to provide power for conveying mixed liquid of polyurethane a material and polyurethane b material so as to realize long-distance quick hole sealing.
However, in the using process of the two devices, as the feeding pipes are fixedly installed, when fixed-point hole sealing at different distances is realized, the two feeding pipes with different lengths cannot be quickly taken down, and the two feeding pipes with different lengths cannot be simultaneously replaced, so that the replacement efficiency is reduced, and therefore, the polyurethane long-distance quick fixed-point hole sealing device and method for underground drilling of the coal mine are provided.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, because the feeding pipes are fixedly installed, when fixed-point hole sealing at different distances is realized, the feeding pipes with different lengths cannot be quickly taken down, and two feeding pipes with different lengths cannot be simultaneously replaced, so that the replacement efficiency is reduced.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a colliery is quick fixed point hole sealing device of polyurethane long distance for drilling in pit, includes the base, the top fixedly connected with mixing box of base, be equipped with stirring subassembly in the mixing box, the top fixedly connected with of base takes out the material pump, take out the feed end of material pump and pass through inlet pipe and mixing box intercommunication, the discharge end intercommunication of taking out the material pump has the discharging pipe, the top of base is fixed with the supporting seat that is used for supporting the discharging pipe, the one end intercommunication of discharging pipe has two connecting pipes, all the card has gone into the pipe joint in the connecting pipe, two the one end of pipe joint communicates respectively has first conveying pipe and second conveying pipe, the top of base is equipped with the change hole, first polyurethane foaming bag is installed to the inside one side of change hole, the inside opposite side of change hole installs the second polyurethane foaming bag, the inside of change hole is provided with the pipe, the top of base is provided with the drive portion that is used for driving pipe joint to insert or pull out, still install the spacing subassembly that is used for two pipe joints in step, still have the linkage in the drive portion to prevent that two pipe joints from falling off, two pipe joints have sealing assembly with sealing joint.
Preferably, the stirring assembly comprises a top cover arranged at the top of the mixing box, two feed hoppers are communicated with the top of the top cover, a motor is fixedly connected to the top of the top cover, and a stirring rod is fixedly connected to the output shaft end of the motor.
Preferably, the driving part comprises a cylinder fixedly connected to the top of the base, one end of the cylinder extension rod is fixedly connected with a rectangular bar, one side surface of the rectangular bar is fixedly connected with a rack, and the top of the rectangular bar is fixedly connected with a clamping block.
Preferably, the limiting component comprises L-shaped blocks symmetrically fixed on two side surfaces of the clamping block, two cross bars are fixedly connected between the L-shaped blocks, two sliding blocks are symmetrically and slidingly connected on the outer surfaces of the cross bars, reset springs are fixedly connected between the sliding blocks and the corresponding L-shaped blocks, L-shaped rods are fixedly connected on the upper side surface and the lower side surface of the sliding blocks, two connecting blocks are symmetrically and fixedly connected on the outer surfaces of the pipeline joints, and fixing holes for being clamped with the L-shaped rods are formed in the connecting blocks.
Preferably, the locking component comprises a gear which is engaged and connected with the outer surface of the rack, a bidirectional screw rod is fixedly connected with the axis of the gear, two supporting blocks are fixedly connected with the top of the base, the bidirectional screw rod is rotationally connected with the supporting blocks through bearings, two moving blocks are symmetrically and threadedly connected with the outer surface of the bidirectional screw rod, locking rods are fixedly connected with the top of the moving blocks, connecting pieces are fixedly connected with the outer surfaces of the pipeline joints, locking grooves are formed in two side surfaces of the connecting pieces, the locking rods can be clamped in the locking grooves, limiting blocks are fixedly connected with the bottoms of the moving blocks, limiting rods are fixedly connected between the two supporting blocks, and the limiting blocks are slidably connected with the outer surfaces of the limiting rods.
Preferably, the sealing assembly comprises three sealing rings fixed on the inner wall of the connecting pipe, two sealing grooves are formed in the outer surface of the pipeline joint, and the sealing rings can be embedded in the sealing grooves.
Preferably, a jack is formed in one side face of the sliding block, and the jack is used for inserting a finger.
Preferably, valves are arranged on the feeding pipe and the two feeding hoppers.
The application method of the polyurethane long-distance quick fixed-point hole sealing device for underground drilling of the coal mine comprises the following steps:
step A: fixed-point measurement and installation: determining reasonable positions of a first polyurethane foaming bag and a second polyurethane foaming bag according to positions of holes to be sealed, determining lengths of a first feeding pipe and a second feeding pipe according to the positions of the first polyurethane foaming bag and the second polyurethane foaming bag, fixing the first polyurethane foaming bag, the second polyurethane foaming bag, the first feeding pipe and the second feeding pipe at corresponding positions of a pressure measuring pipe together, and then sending the first polyurethane foaming bag, the second polyurethane foaming bag, the first feeding pipe and the second feeding pipe to a designated position in a rotating hole together to realize long-distance fixed-point hole sealing;
and (B) step (B): quick replacement of the pipeline: the two pipeline joints are respectively inserted from two through holes on the clamping blocks, the two pipeline joints are fixed through the limiting assembly, meanwhile, the air cylinder is started, the air cylinder drives the rectangular bar to move towards the direction of the connecting pipe, the clamping blocks and the two pipeline joints fixed in the clamping blocks move together, the two pipeline joints are inserted into corresponding connecting pipes, connection between the connecting pipes and the pipeline joints is completed, and when the air cylinder drives the rectangular bar to move towards the direction of the connecting pipes, the rack is driven to move forwards, so that the gear and the bidirectional screw rod are driven to rotate, and the two moving blocks are driven to move towards the middle through the threaded connection of the gear and the bidirectional screw rod and the limiting effect of the limiting block and the limiting rod, so that the locking rod moves towards the middle together, the locking rod is inserted into the corresponding locking groove, and the pipeline joints are locked;
step C: and (3) hole sealing: two different polyurethane raw materials are respectively added into the mixing box and are stirred through the stirring assembly, so that the two polyurethane raw materials are uniformly mixed, after the two polyurethane raw materials are uniformly mixed, the material sucking pump is started, the mixed polyurethane raw materials are sucked into the pipeline joint and the first feeding pipe from the feeding pipe, the discharging pipe and the connecting pipe, and the first polyurethane foaming bag and the second polyurethane foaming bag are respectively injected from the connecting pipe and the pipeline joint, so that the polyurethane raw materials are foamed and expanded, and hole sealing work is completed.
Compared with the prior art, the polyurethane long-distance quick fixed-point hole sealing device and method for underground drilling of the coal mine have the following beneficial effects:
1. this colliery is polyurethane long distance quick fixed point hole sealing device for drilling in pit through L shape piece, horizontal pole, slider, reset spring, L shape pole, connecting block and fixed orifices's setting, can fix two pipe connection, avoids two pipe connection when inserting or extracting the connecting pipe in, takes place the phenomenon of sliding out from the grip block, again through setting up of cylinder, rectangle strip, rack, grip block, adopts electric mode, inserts or extracts pipe connection, has not only increased change efficiency, has reduced manual strength moreover, and it is comparatively convenient to use.
2. This colliery is polyurethane long distance quick fixed point hole sealing device for drilling in pit, through gear, two-way lead screw, supporting shoe, movable block, locking lever, connecting piece, locking groove, stopper, gag lever post's linkage effect, after the cylinder drive pipeline connects inserts in the connecting pipe, can drive locking component operation, make locking component can be timely carry out spacingly to pipeline joint, when preventing the pump start, the impulsive force that produces is too big, makes pipeline joint follow connecting pipe slip, stability when reinforcing the device uses.
3. This colliery is polyurethane long distance quick fixed point hole sealing device for drilling in pit, through the setting of seal groove and sealing washer, can seal the interface department of connecting pipe and pipe joint, avoid taking place the condition that polyurethane revealed.
The invention adopts an electric mode to insert or pull out the pipeline joint, not only increases the replacement efficiency, but also reduces the manual strength, is convenient to use, and can fix two pipeline joints through the limiting component in the process of inserting or pulling out the pipeline joint, so that the phenomenon that the two pipeline joints slide out from the clamping blocks when the two pipeline joints are inserted into or pulled out of the connecting pipe is avoided, and meanwhile, the locking component can limit the pipeline joint timely after the cylinder drives the pipeline joint to be inserted into the connecting pipe through the linkage effect of the locking component, so that the impact force generated when the pumping pump is prevented from being started is too large, and the pipeline joint slides out from the connecting pipe.
Drawings
Fig. 1 is a schematic diagram of a structural front view angle of a polyurethane long-distance quick fixed-point hole sealing device for underground coal mine drilling;
fig. 2 is a schematic diagram of the internal structure of a mixing box and a rotary hole of the polyurethane long-distance quick fixed-point hole sealing device for underground drilling of a coal mine;
FIG. 3 is a schematic diagram of a connecting pipe structure of a polyurethane long-distance quick fixed-point hole sealing device for underground coal mine drilling;
fig. 4 is a schematic diagram of the structural connection relationship among a driving part, a limiting component and a locking component of the polyurethane long-distance quick fixed-point hole sealing device for underground drilling of a coal mine;
fig. 5 is a schematic diagram of the internal structure of a connecting pipe of the polyurethane long-distance quick fixed-point hole sealing device for underground coal mine drilling;
fig. 6 is a schematic diagram of a limiting component structure of a polyurethane long-distance quick fixed-point hole sealing device for underground drilling of a coal mine;
fig. 7 is a schematic diagram of a locking assembly of the polyurethane long-distance quick fixed-point hole sealing device for underground coal mine drilling.
In the figure: 1. a base; 2. a mixing box; 3. a stirring assembly; 301. a top cover; 302. a feed hopper; 303. a motor; 304. a stirring rod; 4. a material pump; 5. a feed pipe; 6. a discharge pipe; 7. a support base; 8. a connecting pipe; 9. a pipe joint; 10. a first feed tube; 11. a second feed tube; 12. a turning hole; 13. a first polyurethane foam bag; 14. a second polyurethane foam bag; 15. a pressure measuring tube; 16. a driving section; 1601. a cylinder; 1602. a rectangular bar; 1603. a rack; 1604. a clamping block; 17. a limit component; 1701. an L-shaped block; 1702. a cross bar; 1703. a slide block; 1704. a return spring; 1705. an L-shaped rod; 1706. a connecting block; 1707. a fixing hole; 18. a locking assembly; 1801. a gear; 1802. a two-way screw rod; 1803. a support block; 1804. a moving block; 1805. a locking lever; 1806. a connecting piece; 1807. a locking groove; 1808. a limiting block; 1809. a limit rod; 19. a seal assembly; 1901. sealing grooves; 1902. a seal ring; 20. and a jack.
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.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices 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 figures 1-7, the polyurethane long-distance quick fixed-point hole sealing device for underground drilling of coal mines comprises a base 1, wherein the top of the base 1 is fixedly connected with a mixing box 2, a stirring assembly 3 is arranged in the mixing box 2, the top of the base 1 is fixedly connected with a material pumping pump 4, the feeding end of the material pumping pump 4 is communicated with the mixing box 2 through a feeding pipe 5, the discharging end of the material pumping pump 4 is communicated with a discharging pipe 6, the top of the base 1 is fixedly provided with a supporting seat 7 for supporting the discharging pipe 6, one end of the discharging pipe 6 is communicated with two connecting pipes 8, pipe joints 9 are clamped in the connecting pipes 8, one ends of the two pipe joints 9 are respectively communicated with a first feeding pipe 10 and a second feeding pipe 11, the top of the base 1 is provided with a rotary hole 12, one side inside the rotary hole 12 is provided with a first polyurethane foaming bag 13, the second polyurethane foaming bag 14 is installed to the opposite side of change hole 12 inside, the inside of change hole 12 is provided with pressure measurement pipe 15, the top of base 1 is provided with the drive division 16 that is used for driving pipeline joint 9 to insert or extract, still install the spacing subassembly 17 that is used for two synchronous pipeline joints 9 of fixing on the drive division 16, still the linkage has the locking subassembly 18 that is used for preventing two pipeline joints 9 to drop on the drive division 16, the interface department of connecting pipe 8 and pipeline joint 9 is provided with seal assembly 19, stirring subassembly 3 is including the top cap 301 that sets up at mixing box 2 top, the top intercommunication of top cap 301 has two feeder hoppers 302, the top fixedly connected with motor 303 of top cap 301, the output axle head fixedly connected with puddler 304 of motor 303, the valve is all installed on inlet pipe 5 and the two feeder hoppers 302.
In the invention, when the device is used, the reasonable positions of the first polyurethane foam bag 13 and the second polyurethane foam bag 14 are determined according to the positions of the holes to be sealed, the lengths of the first conveying pipe 10 and the second conveying pipe 11 are determined according to the positions of the first polyurethane foam bag 13 and the second polyurethane foam bag 14, the first polyurethane foam bag 13, the second polyurethane foam bag 14, the first conveying pipe 10 and the second conveying pipe 11 are fixed at the corresponding positions of the pressure measuring pipe 15 together, then the first conveying pipe and the second conveying pipe 11 are sent to the appointed positions in the rotating hole 12 together to realize long-distance fixed-point hole sealing, when the first conveying pipe 10 and the second conveying pipe 11 with different lengths are required to be matched, the two pipeline joints 9 are fixed through the limiting assembly 17, the driving part 16 is started, the two pipeline joints 9 are driven to be inserted into the connecting pipe 8 through the driving force generated by the driving part 16, the connecting pipe 8 and the pipeline joint 9 are preliminarily connected, the connecting part of the connecting pipe 8 and the pipeline joint 9 is sealed through the sealing component 19, polyurethane raw materials can be prevented from flowing out, the pipeline joint 9 is inserted or pulled out through the driving part 16 in an electric mode, the replacement efficiency is improved, the manual strength is reduced, the whole hole sealing process is quicker, the two pipeline joints 9 can be fixed through the limiting component 17, the phenomenon that the two pipeline joints 9 slide out from the clamping blocks 1604 when the two pipeline joints 9 are inserted or pulled out of the connecting pipe 8 is avoided, the locking component 18 can be driven to operate when the driving part 16 is started, the pipeline joints 9 can be limited in time after the two pipeline joints 9 are inserted into the connecting pipe 8 through the locking component 18, and the generated impact force is prevented from being too large when the pumping pump 4 is started, the pipeline joint 9 slides out of the connecting pipe 8, stability of the device in use is enhanced, the top cover 301 is covered on the top of the mixing box 2, the top cover 301 is fixed through bolts, wherein the bolts can be replaced by lock catches which are arranged on the mixing box 2 and the top cover 301 and are matched with each other, the fixing effect is achieved, two different polyurethane raw materials are respectively added into the mixing box 2 from two feed hoppers 302, the motor 303 is started, the motor 303 drives the stirring rod 304 to rotate, the polyurethane raw materials are uniformly mixed, foaming effect of the polyurethane raw materials is enhanced, after the polyurethane raw materials are uniformly mixed, the valve is opened, the suction pump 4 is started, the mixed polyurethane raw materials are sucked into the pipeline joint 9 from the feed pipe 5, the discharge pipe 6 and the connecting pipe 8, and the first polyurethane foaming bag 13 and the second polyurethane foaming bag 14 are respectively injected from the first feed pipe 10 and the second feed pipe 11, so that the polyurethane foaming bags are foamed and expanded, and hole sealing work is completed.
Example 2:
referring to fig. 1-7, the polyurethane long-distance quick fixed point hole sealing device for underground drilling of coal mine comprises a base 1, the top of the base 1 is fixedly connected with a mixing box 2, a stirring component 3 is arranged in the mixing box 2, the top of the base 1 is fixedly connected with a material pumping pump 4, the feeding end of the material pumping pump 4 is communicated with the mixing box 2 through a feeding pipe 5, the discharging end of the material pumping pump 4 is communicated with a discharging pipe 6, the top of the base 1 is fixedly provided with a supporting seat 7 for supporting the discharging pipe 6, one end of the discharging pipe 6 is communicated with two connecting pipes 8, pipe joints 9 are clamped in the connecting pipes 8, one ends of the two pipe joints 9 are respectively communicated with a first feeding pipe 10 and a second feeding pipe 11, the top of the base 1 is provided with a rotary hole 12, one side inside the rotary hole 12 is provided with a first polyurethane foaming bag 13, the other side inside the rotary hole 12 is provided with a second polyurethane foaming bag 14, the inside of the rotary hole 12 is provided with a pressure measuring pipe 15, the top of the base 1 is provided with a driving part 16 for driving the pipe joint 9 to be inserted into or pulled out, the driving part 16 is also provided with a limiting component 17 for synchronously fixing the two pipe joints 9, the driving part 16 is also linked with a locking component 18 for preventing the two pipe joints 9 from falling off, the interface of the connecting pipe 8 and the pipe joint 9 is provided with a sealing component 19, the driving part 16 comprises an air cylinder 1601 fixedly connected at the top of the base 1, one end of an extension rod of the air cylinder 1601 is fixedly connected with a rectangular bar 1602, one side surface of the rectangular bar 1602 is fixedly connected with a rack 1603, the top of the rectangular bar 1602 is fixedly connected with a clamping block 1604, the limiting component 17 comprises L-shaped blocks 1701 symmetrically fixed at two side surfaces of the clamping block 1604, two cross bars 1702 are fixedly connected between the two L-shaped blocks 1701, the outer surfaces of the cross bars 1702 are symmetrically and slidingly connected with two sliding blocks 1703, a reset spring 1704 is fixedly connected between the two sliding blocks 1703 and the corresponding L-shaped blocks 1701, L-shaped rods 1705 are fixedly connected to the upper side surface and the lower side surface of the sliding blocks 1703, two connecting blocks 1706 are symmetrically fixed to the outer surfaces of the two pipeline joints 9, fixing holes 1707 which are clamped with the L-shaped rods 1705 are formed in the connecting blocks 1706, insertion holes 20 are formed in one side surface of the sliding blocks 1703, and the insertion holes 20 are used for finger insertion.
In the invention, when two pipe joints 9 are required to be fixed, fingers are inserted into two insertion holes 20, sliding blocks 1703 are arranged on the outer surface of a cross bar 1702 to slide towards two sides, two L-shaped rods 1705 slide towards two sides along with each other, a return spring 1704 is compressed, two pipe joints 9 are respectively inserted into two through holes on a clamping block 1604, the positions of two connecting blocks 1706 are aligned with the positions of the L-shaped rods 1705, the sliding blocks 1703 are loosened, the two sliding blocks 1703 and the L-shaped rods 1705 are driven to slide towards the middle through the elastic force of the return spring 1704, the L-shaped rods 1705 are inserted into corresponding fixing holes 1707, the fixing of the two pipe joints 9 can be synchronously completed, the phenomenon that the pipe joints 9 fall off is avoided, a cylinder 1601 is started, the rectangular bar 1602 is driven to move towards the direction of a connecting pipe 8, the clamping block 1604 and the two pipe joints 9 fixed in the clamping block 1604 move along with each other, the two pipe joints 9 are inserted into corresponding connecting pipes 8, and the connection between the connecting pipes 8 and the pipe joints 9 is completed.
Example 3:
referring to fig. 1-7, the polyurethane long-distance quick fixed point hole sealing device for underground drilling of coal mine comprises a base 1, the top of the base 1 is fixedly connected with a mixing box 2, a stirring component 3 is arranged in the mixing box 2, the top of the base 1 is fixedly connected with a material pumping pump 4, the feeding end of the material pumping pump 4 is communicated with the mixing box 2 through a feeding pipe 5, the discharging end of the material pumping pump 4 is communicated with a discharging pipe 6, the top of the base 1 is fixedly provided with a supporting seat 7 for supporting the discharging pipe 6, one end of the discharging pipe 6 is communicated with two connecting pipes 8, pipe joints 9 are clamped in the connecting pipes 8, one ends of the two pipe joints 9 are respectively communicated with a first feeding pipe 10 and a second feeding pipe 11, the top of the base 1 is provided with a rotary hole 12, one side inside the rotary hole 12 is provided with a first polyurethane foaming bag 13, the other side inside the rotary hole 12 is provided with a second polyurethane foaming bag 14, the pressure measuring tube 15 is arranged in the rotary hole 12, the top of the base 1 is provided with a driving part 16 for driving the pipeline joint 9 to be inserted into or pulled out, the driving part 16 is also provided with a limiting component 17 for synchronously fixing the two pipeline joints 9, the driving part 16 is also linked with a locking component 18 for preventing the two pipeline joints 9 from falling off, the interface of the connecting tube 8 and the pipeline joint 9 is provided with a sealing component 19, the driving part 16 comprises an air cylinder 1601 fixedly connected at the top of the base 1, one end of an extension rod of the air cylinder 1601 is fixedly connected with a rectangular bar 1602, one side surface of the rectangular bar 1602 is fixedly connected with a rack 1603, the top of the rectangular bar 1602 is fixedly connected with a clamping block 1604, the locking component 18 comprises a gear 1801 which is meshed with the outer surface of the rack 1603, a bidirectional screw rod is fixedly connected at the axis of the gear 1801, the top of the base 1 is fixedly connected with two supporting blocks 1803, the bidirectional screw rod 1802 is rotationally connected with the supporting blocks 1803 through bearings, two movable blocks 1804 are symmetrically and threadedly connected to the outer surface of the bidirectional screw rod 1802, locking rods 1805 are fixedly connected to the top of the movable blocks 1804, connecting pieces 1806 are fixedly connected to the outer surfaces of pipeline connectors 9, locking grooves 1807 are formed in two side faces of the connecting pieces 1806, the locking rods 1805 can be clamped in the locking grooves 1807, limiting blocks 1808 are fixedly arranged at the bottoms of the movable blocks 1804, limiting rods 1809 are fixedly connected between the two supporting blocks 1803, and the limiting blocks 1808 are slidably connected to the outer surfaces of the limiting rods 1809.
In the invention, when the air cylinder 1601 drives the rectangular bar 1602 to move towards the connecting pipe 8, the rack 1603 is also driven to move forwards, and as the rack 1603 is meshed with the gear 1801, the gear 1801 and the bidirectional screw 1802 are driven to rotate, and the two moving blocks 1804 are driven to move towards the middle through the threaded connection of the gear 1801 and the bidirectional screw 1802 and the limit function of the limit block 1808 and the limit rod 1809, so that the locking rod 1805 moves towards the middle along with the movement, the locking rod 1805 is inserted into the corresponding locking groove 1807, the pipeline joint 9 is locked, the impact force is prevented from being too large, the pipeline joint 9 is prevented from falling off, the locking assembly 18 and the driving part 16 are started by one power supply of the air cylinder 1601, the quantity of the power supply is reduced, and the linkage between structures is strong.
Example 4:
referring to fig. 1-7, the quick fixed point hole sealing device of polyurethane long distance for colliery is drilled in pit, the on-line screen storage device comprises a base 1, the top fixedly connected with mixing box 2 of base 1, be equipped with stirring subassembly 3 in the mixing box 2, the top fixedly connected with pump 4 of taking out of base 1, the feed end of pump 4 passes through inlet pipe 5 and mixing box 2 intercommunication, the discharge end intercommunication of pump 4 has discharging pipe 6, the top of base 1 is fixed with the supporting seat 7 that is used for supporting discharging pipe 6, the one end intercommunication of discharging pipe 6 has two connecting pipes 8, all block into in the connecting pipe 8 has pipeline joint 9, the one end of two pipeline joint 9 is linked respectively and is had first conveying pipe 10 and second conveying pipe 11, the top of base 1 is equipped with change hole 12, the inside one side of change hole 12 is installed first polyurethane foam bag 13, the inside opposite side of change hole 12 is installed second polyurethane foam bag 14, the inside of change hole 12 is provided with inlet 15, the top of base 1 is provided with the drive portion 16 that is used for driving pipeline joint 9 to insert or extract, still install the drive portion 16 that is used for synchronous fixed two pipeline joint 9 on the drive portion 16, the drive portion 17 has two pipeline joint 9 to have two pipeline joint's sealing washer 1902, the sealing washer 19 is located at two sealing washer 9 sealing washer 19 sealing joint 1, sealing washer 19 is sealed joint 9 is equipped with in the sealing joint between two pipeline joint 9, sealing washer 1.
In the invention, when two pipe joints 9 are inserted into corresponding connecting pipes 8, the sealing rings 1902 are inserted into corresponding sealing grooves 1901, so that the interface of the connecting pipes 8 and the pipe joints 9 is sealed, the outflow of polyurethane raw materials is prevented, and the sealing effect is better through multiple sealing.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (5)
1. The utility model provides a colliery is polyurethane long distance quick fixed point hole sealing device for drilling in pit, includes base (1), a serial communication port, the top fixedly connected with mixing box (2) of base (1), be equipped with stirring subassembly (3) in mixing box (2), the top fixedly connected with material pump (4) of base (1), the feed end of material pump (4) is through inlet pipe (5) and mixing box (2) intercommunication, the discharge end intercommunication of material pump (4) has discharging pipe (6), the top of base (1) is fixed with supporting seat (7) that are used for supporting discharging pipe (6), the one end intercommunication of discharging pipe (6) has two connecting pipes (8), all block into in connecting pipe (8) has pipe joint (9), and two the one end of pipe joint (9) is linked together respectively and is had first conveying pipe (10) and second conveying pipe (11), the inside one side of change hole (12) installs first polyurethane foam bag (13), the inside change hole (12) and install in the top (12) and be used for driving the inside the expansion joint (16) of polyurethane bag (1), the driving part (16) is also provided with a limiting component (17) for synchronously fixing the two pipeline joints (9), the driving part (16) is also linked with a locking component (18) for preventing the two pipeline joints (9) from falling off, and a sealing component (19) is arranged at the interface of the connecting pipe (8) and the pipeline joints (9);
the stirring assembly (3) comprises a top cover (301) arranged at the top of the mixing box (2), two feed hoppers (302) are communicated with the top of the top cover (301), a motor (303) is fixedly connected to the top of the top cover (301), and a stirring rod (304) is fixedly connected to the output shaft end of the motor (303);
the driving part (16) comprises an air cylinder (1601) fixedly connected to the top of the base (1), one end of an extension rod of the air cylinder (1601) is fixedly connected with a rectangular bar (1602), one side surface of the rectangular bar (1602) is fixedly connected with a rack (1603), and the top of the rectangular bar (1602) is fixedly connected with a clamping block (1604);
the limiting assembly (17) comprises L-shaped blocks (1701) symmetrically fixed on two side surfaces of a clamping block (1604), two cross bars (1702) are fixedly connected between the two L-shaped blocks (1701), two sliding blocks (1703) are symmetrically and slidingly connected to the outer surfaces of the cross bars (1702), return springs (1704) are fixedly connected between the two sliding blocks (1703) and the corresponding L-shaped blocks (1701), L-shaped rods (1705) are fixedly connected to the upper side surface and the lower side surface of the sliding blocks (1703), two connecting blocks (1706) are symmetrically fixed on the outer surfaces of the two pipeline connectors (9), and fixing holes (1707) clamped with the L-shaped rods (1705) are formed in the connecting blocks (1706);
the locking assembly (18) comprises a gear (1801) which is connected to the outer surface of a rack (1603) in a meshed mode, a bidirectional screw rod (1802) is fixedly connected to the axis of the gear (1801), two supporting blocks (1803) are fixedly connected to the top of the base (1), the bidirectional screw rod (1802) is rotatably connected with the supporting blocks (1803) through bearings, two moving blocks (1804) are symmetrically connected to the outer surface of the bidirectional screw rod (1802) in a threaded mode, a locking rod (1805) is fixedly connected to the top of the moving block (1804), a connecting piece (1806) is fixedly connected to the outer surface of a pipe joint (9), locking grooves (1807) are formed in two side faces of the connecting piece (1806), the locking rod (1805) can be clamped in the locking grooves (1807), limiting blocks (1808) are fixedly connected to the bottom of the moving blocks (1803), and limiting rods (1809) are fixedly connected between the two supporting blocks (1803) in a sliding mode, and the limiting blocks (1808) are connected to the outer surface of the limiting rods (1809).
2. The polyurethane long-distance quick fixed-point hole sealing device for underground coal mine drilling according to claim 1, wherein the sealing assembly (19) comprises three sealing rings (1902) fixed on the inner wall of the connecting pipe (8), two sealing grooves (1901) are formed in the outer surface of the pipeline joint (9), and the sealing rings (1902) can be embedded in the sealing grooves (1901).
3. The polyurethane long-distance quick fixed-point hole sealing device for underground coal mine drilling according to claim 1, wherein insertion holes (20) are formed in one side face of the sliding block (1703), and the insertion holes (20) are used for finger insertion.
4. The polyurethane long-distance quick fixed-point hole sealing device for underground coal mine drilling according to claim 1, wherein valves are arranged on the feeding pipe (5) and the two feeding hoppers (302).
5. The application method of the polyurethane long-distance quick fixed-point hole sealing device for underground coal mine drilling comprises the following steps of:
step A: fixed-point measurement and installation: according to the positions of the holes to be sealed, the reasonable positions of a first polyurethane foaming bag (13) and a second polyurethane foaming bag (14) are determined, the lengths of a first feeding pipe (10) and a second feeding pipe (11) are determined according to the positions of the first polyurethane foaming bag (13) and the second polyurethane foaming bag (14), the first polyurethane foaming bag (13), the second polyurethane foaming bag (14), the first feeding pipe (10) and the second feeding pipe (11) are fixed at the corresponding positions of a pressure measuring pipe (15) together, and then the positions are fed into the designated positions in a rotating hole (12) together, so that long-distance fixed-point hole sealing is realized;
and (B) step (B): quick replacement of the pipeline: the two pipeline joints (9) are respectively inserted from two through holes on the clamping block (1604), the two pipeline joints (9) are fixed through the limiting component (17), meanwhile, the air cylinder (1601) is started, the air cylinder (1601) drives the rectangular bar (1602) to move towards the connecting pipe (8), the clamping block (1604) and the two pipeline joints (9) fixed in the clamping block (1604) move along, the two pipeline joints (9) are inserted into the corresponding connecting pipe (8), connection between the connecting pipe (8) and the pipeline joints (9) is completed, when the air cylinder (1601) drives the rectangular bar (1602) to move towards the connecting pipe (8), the rack (1603) is driven to move forwards, so that the gear (1801) and the bidirectional screw (1802) are driven to rotate, and the two moving blocks (1804) are driven to move towards the middle through the threaded connection of the gear (1801) and the limiting effect of the limiting block (1808) and the limiting rod (1809), the locking rod (1805) moves along with the middle, and the locking rod (1805) moves towards the middle, so that the locking rod (1807) is inserted into the corresponding locking groove (1805) to lock the locking groove (1807);
step C: and (3) hole sealing: two different polyurethane raw materials are respectively added into the mixing box (2) and are stirred through the stirring assembly (3), so that the two polyurethane raw materials are uniformly mixed, after the two polyurethane raw materials are uniformly mixed, the material suction pump (4) is started, the mixed polyurethane raw materials are sucked into the pipeline joint (9) and the first conveying pipe (10) from the feeding pipe (5), the discharging pipe (6) and the connecting pipe (8), and the first polyurethane foaming bag (13) and the second polyurethane foaming bag (14) are respectively injected from the connecting pipe (8) and the pipeline joint (9), so that the polyurethane raw materials are foamed and expanded, and hole sealing work is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310372112.9A CN116378598B (en) | 2023-04-10 | 2023-04-10 | Polyurethane long-distance quick fixed-point hole sealing device and method for underground coal mine drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310372112.9A CN116378598B (en) | 2023-04-10 | 2023-04-10 | Polyurethane long-distance quick fixed-point hole sealing device and method for underground coal mine drilling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116378598A CN116378598A (en) | 2023-07-04 |
| CN116378598B true CN116378598B (en) | 2023-11-03 |
Family
ID=86967234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310372112.9A Active CN116378598B (en) | 2023-04-10 | 2023-04-10 | Polyurethane long-distance quick fixed-point hole sealing device and method for underground coal mine drilling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116378598B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3878686A (en) * | 1972-11-21 | 1975-04-22 | Geol Associates Inc | Grouting process |
| CN102913183A (en) * | 2012-10-26 | 2013-02-06 | 河南理工大学 | Multifunctional pneumatic sealing device and matched sealing process thereof |
| CN205445544U (en) * | 2016-03-24 | 2016-08-10 | 河南理工大学 | Colliery is boring polyurethane long distance hole sealing device of fixing a point fast in pit |
| CN109184613A (en) * | 2018-10-26 | 2019-01-11 | 晋中学院 | A kind of polyurethane gas hole sealing device |
| CN208934647U (en) * | 2018-10-26 | 2019-06-04 | 晋中学院 | A kind of polyurethane gas hole sealing device |
| CN217462102U (en) * | 2022-03-23 | 2022-09-20 | 山东金鼎新能源材料有限公司 | Polyurethane long-distance quick fixed-point hole sealing device for underground drilling of coal mine |
-
2023
- 2023-04-10 CN CN202310372112.9A patent/CN116378598B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3878686A (en) * | 1972-11-21 | 1975-04-22 | Geol Associates Inc | Grouting process |
| CN102913183A (en) * | 2012-10-26 | 2013-02-06 | 河南理工大学 | Multifunctional pneumatic sealing device and matched sealing process thereof |
| CN205445544U (en) * | 2016-03-24 | 2016-08-10 | 河南理工大学 | Colliery is boring polyurethane long distance hole sealing device of fixing a point fast in pit |
| CN109184613A (en) * | 2018-10-26 | 2019-01-11 | 晋中学院 | A kind of polyurethane gas hole sealing device |
| CN208934647U (en) * | 2018-10-26 | 2019-06-04 | 晋中学院 | A kind of polyurethane gas hole sealing device |
| CN217462102U (en) * | 2022-03-23 | 2022-09-20 | 山东金鼎新能源材料有限公司 | Polyurethane long-distance quick fixed-point hole sealing device for underground drilling of coal mine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116378598A (en) | 2023-07-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103306657B (en) | A kind of coal seam cutting release is anti-reflection and slot holding device and method | |
| CN203145957U (en) | Mining concrete wet-type injecting equipment | |
| CN116378598B (en) | Polyurethane long-distance quick fixed-point hole sealing device and method for underground coal mine drilling | |
| CN103061787A (en) | Mining wet type concrete spraying device | |
| CN113236347B (en) | Full-automatic gas extraction multiple hole sealing system and method | |
| CN201431939Y (en) | Pumping wet spraying machine | |
| CN202707065U (en) | Tracked all-hydraulic drill for coal mines | |
| CN111232602A (en) | Dedicated multi-functional feeding device of subway shield construction | |
| CN108590621B (en) | System and method for high-pressure sand adding after hydraulic fracturing remote continuous pump in coal mine | |
| CN201677384U (en) | Mine anti-explosion cement foaming machine | |
| CN216840785U (en) | Glue injection device for building structure reinforcement | |
| CN213269969U (en) | Automatic accurate proportioning device of high pressure | |
| CN210087288U (en) | Quantitative quick pressurizing device for water injection hole packer | |
| CN103266598A (en) | Equipment for one-time pile forming into rock of screw pile driver and pile forming method | |
| CN110685708A (en) | Underground mechanical type excavating equipment for mine field | |
| CN114687674A (en) | Operating arm of anchor bar trolley with rod piece bracket | |
| CN201065838Y (en) | Screw filling pump | |
| CN219366003U (en) | Drilling hole sealing system special for gas extraction between coal beds | |
| CN218407289U (en) | Coal seam gas drainage drilling repairing equipment | |
| CN219002948U (en) | Accurate interpolation device of raw materials | |
| CN212104101U (en) | Concrete grouting machine | |
| CN215541707U (en) | Coal dressing system is with automatic powdered ore medium device that adds | |
| CN219638883U (en) | Gangue ejector high-efficiency filling system | |
| CN217176693U (en) | Colliery is combination formula hole collapse inefficacy drilling prosthetic devices in pit | |
| CN115977548A (en) | Drilling, punching and slotting integrated drill bit for low-permeability soft coal seam crossing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |