CN209398356U - Device for coal is broken in compound abrasive gas jet after a kind of - Google Patents
Device for coal is broken in compound abrasive gas jet after a kind of Download PDFInfo
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- CN209398356U CN209398356U CN201822158951.8U CN201822158951U CN209398356U CN 209398356 U CN209398356 U CN 209398356U CN 201822158951 U CN201822158951 U CN 201822158951U CN 209398356 U CN209398356 U CN 209398356U
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- abrasive material
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Abstract
The utility model discloses a kind of rear compound abrasive gas jets to break device for coal, the air feed component being arranged in parallel including drilling assembly and at least two groups, air feed component includes tank body, the outer wall both ends of tank body are provided with refrigerating plant, heating plant is set in the middle part of the outer wall of tank body, drilling assembly includes drilling machine, the drilling rod import of drilling machine connects pressure duct, the drilling rod outlet connection feed drilling rod of drilling machine, being fed drilling rod includes abrasive material pipeline and the gas pipeline for being sheathed on abrasive material pipeline inside center, the utility model is compared to front mixing abrasive gas jet feeding system, using compound abrasive in mixing chamber and gas jet, it avoids in down-hole application and blocking pipeline occurs, wear drilling rod problem, and pass through design feed drilling rod, original drilling rod is divided into abrasive material pipeline and gas pipeline, abrasive material is cooperated to form high pressure on the basis of being passed through high pressure gas Abrasive material gas jet improves brokenly coal effect.
Description
Technical field
The utility model relates to abrasive material gas fluidics fields, broken more particularly to a kind of rear compound abrasive gas jet
Device for coal.
Background technique
Arrangement drilling Gas pre-drainage is the important means for preventing and treating Gas Disaster and realizing gas comprehensive utilization of energy, but with
Pit mining depth increases, and crustal stress increases, and gas drainage condition tends to be complicated, and coal seam permeability reduces, and takes out to improve gas
Coal seam pressure relief need to be carried out by adopting effect.Common release extraction way mainly has the " waterpower such as high-pressure water jet slot, hydraulic flushing in hole
Change " measure.The moisture that the technology is introduced into coal seam in the application can inhibit gas migration, delay gas rate of release, and in pine
Also often occur phenomena such as collapse hole, plug-hole in soft seam, leads to gas drainage channel blockage, gas extraction flow and concentration pole
It is low, seriously limit the popularization and application in weak seam.And when abrasive material gas jet being used to carry out release extraction, about feed
Mode, using front mixing abrasive jet stream drilling technique, although the abrasive particle acceleration time is long, more to drill pipe system abrasion
Seriously, and the concentration of abrasive material is not easy to control, and abrasive material is easily accumulated in preceding mixing chamber, causes line clogging, seriously affects drilling rod
Service life, at the same operation and maintenance get up it is more inconvenient.
In addition, the method for common mash gas extraction is the mode of drilling in coal production, air compressor is set in underground
Air feed system, not only use it is not easy, and do not meet safety regulations in coal mine regulation, to underground work personnel have safety it is hidden
Suffer from；There are some problems for existing bore mode simultaneously, in drill bit drilling process, especially in weak seam, can cause to collapse
It falls into, hinders the discharge of cinder, a large amount of coal slimes are wrapped in around drill bit and drilling rod, and form overall vacuum state with drilling, are led
It causes plug-hole, embrace phenomena such as boring, and when drilling in harder coal seam, i.e. the Protodyakonov coefficient f > 3 in coal seam can make drill bit
At injury, cause to cause to be broken in drilling rod or drill bit drilling process.
So the utility model provides the new scheme of one kind to solve the problems, such as this.
Utility model content
For above situation, for the defect for overcoming the prior art, the utility model be designed to provide one kind after mix
Device for coal is broken in abrasive material gas jet.
Its technical solution solved is: device for coal, including drilling assembly and at least are broken in compound abrasive gas jet after a kind of
Two groups of air feed components being arranged in parallel；The air feed component includes tank body, and pressure gauge, the both ends difference of tank body are provided on tank body
It is connected to the gas outlet of air inlet pipeline and the air inlet of outlet pipe, the air inlet Correspondent of the air inlet pipeline of each air feed component extremely supplies
Air pipe line, the gas outlet Correspondent of outlet pipe to pressure duct, be respectively set on air inlet pipeline, outlet pipe the first pressure reducing valve,
Second pressure reducing valve, the outer wall both ends of tank body are provided with refrigerating plant, are provided with heating plant in the middle part of the outer wall of tank body；The brill
It include drilling machine into component, the drilling rod import of drilling machine connects pressure duct, the drilling rod outlet connection feed drilling rod of drilling machine, the feed
Drilling rod includes abrasive material pipeline and the gas pipeline for being sheathed on abrasive material pipeline inside center, is fed the import of drilling rod and is located at abrasive material pipe
Ring baffle is fixedly installed between road and gas pipeline, multiple air inlets are offered on ring baffle, the outlet for being fed drilling rod is set
The mixing chamber being connected to abrasive material pipeline is set, mixing chamber includes one and the consistent axial spout of feed drilling rod export direction and two
Oppose the radial jet nozzle being arranged, and threeway spray head is arranged in mixing chamber, and threeway spray head includes an axial spray head and two radial direction sprays
Head is respectively corresponded and is set at axial spout and radial jet nozzle, the outlet of the air inlet connection gas pipeline of threeway spray head, feed
The outlet of drilling rod and check valve is set between abrasive material pipeline and gas pipeline.
Preferably, the check valve includes valve block and multiple springs, and the valve block is the hemispherical knot of top setting opening
The bottom of structure, valve block is fixedly connected with the inner wall of abrasive material pipeline, and the top of valve block and the outer wall of gas pipeline connect, described
The both ends of spring are individually fixed in the top and bottom of valve block.
Preferably, the valve block is elastic sheet metal.
Preferably, the axial spray head, radial spray head on the first counterbalance valve, the second counterbalance valve is respectively set.
Preferably, the refrigerating plant is liquid nitrogen cycle refrigeration system, and the heating plant is oil bath circulating heat supply system.
Preferably, the axial spray head, radial spray head are siphon spray head.
Preferably, the axial spout, be provided with Laval-cavity nozzle on radial jet nozzle.
Preferably, setting high pressure sealing in the junction of the drilling rod of the drilling machine and pressure duct rotates adapter.
Due to the use of above technical scheme, the utility model has the advantages that compared with prior art
1. the utility model is freezed or is added to tank body using liquid nitrogen cycle refrigeration system and oil bath circulating heat supply system
Heat avoids security risk of the air pressure pump in down-hole application to obtain brokenly the high pressure gas of pressure needed for coal.Compared to
Front mixing abrasive gas jet feeding system, the utility model are avoided using compound abrasive and gas jet in mixing chamber
Occur blocking pipeline, abrasion drilling rod problem in down-hole application.The utility model is by design feed drilling rod, by original drilling rod point
For abrasive material pipeline and gas pipeline, cooperates abrasive material to form high-pressure abrasive material gas jet on the basis of being passed through high pressure gas, improve
Broken coal effect；
2. the utility model installs threeway spray head in mixing chamber, to adapt in a manner of different broken coals, threeway spray head is used
Siphon spray head plays the role of accelerating air-flow, and preferably abrasive material can be made to enter mixing chamber using pressure difference；
3. Laval-cavity nozzle is arranged on mixing chamber effectively accelerates jet stream, improves auxiliary bore hole and slot breaks coal effect, phase
When breaking coal mode in the waterpowerization such as water jet slot, hydraulic flushing in hole in the prior art, it can be avoided drilling and collapse, improve simultaneously
Jet impact force expands relief range；
4. abrasive material pipeline will not be back in mixing chamber by playing the role of control abrasive material, more by setting check valve
The function and effect of good guarantee abrasive material；By be arranged counterbalance valve, when ensure that brokenly coal operation in gas pipeline pressure stability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Fig. 2 is the cross-sectional view that drilling rod is fed in the utility model.
Fig. 3 is the structural schematic diagram of ring baffle in the utility model.
Fig. 4 is the cross-sectional view of mixing chamber in the utility model.
In figure: 11- tank body, 12- air inlet pipeline, 13- outlet pipe, 14- air-supply pipeline, 15- pressure duct, 16- first
Pressure reducing valve, the second pressure reducing valve of 17-, 18- refrigerating plant, 19- heating plant, 20- drilling machine, 21- drilling rod, 22- are fed drilling rod, 221-
Abrasive material pipeline, 222- gas pipeline, 223- ring baffle, 224- air inlet, 23- mixing chamber, 231- axial direction spout, 232- diameter
To spout, 233- axial direction spray head, 234- radial direction spray head, the first counterbalance valve of 235-, the second counterbalance valve of 236-, 241- valve block, 242-
Spring, 25- high pressure sealing rotate adapter.
Specific embodiment
Aforementioned and other technology contents, feature and effect in relation to the utility model, in following cooperation with reference to figures 1 through attached
Fig. 4 can be clearly presented in the detailed description of embodiment.The structure content being previously mentioned in following embodiment is to say
Bright book attached drawing is reference.
As shown in Figure 1, device for coal is broken in compound abrasive gas jet after a kind of, including drilling assembly and at least two groups parallel connection are set
The air feed component set.Air feed component includes tank body 11, and the both ends of tank body 11 are respectively communicated with gas outlet and the outlet of air inlet pipeline 12
13 air inlet of pipeline, to air-supply pipeline 14, outlet pipe 13 goes out the air inlet Correspondent of the air inlet pipeline 12 of each air feed component
The first pressure reducing valve 16, the second pressure reducing valve is respectively set on air inlet pipeline 12, outlet pipe 13 to pressure duct 15 in port Correspondent
17.When specific setting, the outer wall both ends of tank body 11 are provided with refrigerating plant 18, and heating plant is arranged in the middle part of the side wall of tank body 11
19.Refrigerating plant 18, heating plant 19 are cooled down or are heated up to tank body 11 respectively, change 11 internal gas of tank body to reach
The purpose of pressure.Refrigerating plant 18 selects the liquid nitrogen cycle refrigeration system of existing maturation, can cool down to tank body 11, minimum to reach
77K has good cooling effect, and heating plant 19 selects the oil bath circulating heat supply system of existing maturation, and heating has fine
Stability.Liquid nitrogen cycle refrigeration system, the cooling of oil bath circulating heat supply system, heating pipeline uniform winding are arranged in tank body
On 11 outer wall, preferably tank body 11 is cooled down or be heated up, working efficiency is improved.It is provided with pressure gauge on tank body 11,
It is convenient that 11 internal pressure of tank body is observed when being cooled down or being heated up in tank body 11.
Drilling assembly includes drilling machine 20, and 21 import of drilling rod of drilling machine 20 connects pressure duct 15, in order to guarantee the close of connection
The junction setting high pressure sealing of closing property, 21 import of drilling rod and pressure duct 15 rotates adapter 25.
As shown in Figure 2,3, the outlet of the drilling rod 21 connection feed drilling rod 22 of drilling machine 20, feed drilling rod 22 includes abrasive material pipeline
221 and it is sheathed on the gas pipeline 222 of 221 inside center of abrasive material pipeline, be fed the import of drilling rod 22 and is located at abrasive material pipeline 221
Ring baffle 223 is fixedly installed between gas pipeline 222, offers multiple air inlets 224 on ring baffle 223.Specifically make
Abrasive material is added by air inlet 224 first in used time between abrasive material pipeline 221 and gas pipeline 222, then by the drilling rod of drilling machine 20
21 outlets are directly threadedly coupled with abrasive material pipeline 221, when being passed through high pressure gas inside the drilling rod 21 of drilling machine 20, a large amount of high pressure
Gas can be passed through inside gas pipeline 222, while a small amount of high pressure gas also can reach abrasive material pipeline 221 by air inlet 224
Between gas pipeline 222, so that abrasive material be driven to travel forward.
As shown in figure 4, a mixing chamber 23 being connected to abrasive material pipeline 221, mixing chamber is arranged in the outlet of feed drilling rod 22
23 include the radial jet nozzle 232 of one with feed 22 export direction of drilling rod consistent axial spout 231 and two opposition settings, axis
It is provided with Laval-cavity nozzle on spout 231, radial jet nozzle 232, can effectively accelerate jet stream, makes abrasive material gas jet in daraf(reciprocal of farad)
You accelerate nozzle exit velocity, to improve broken coal effect.
Threeway spray head is set in mixing chamber 23, threeway spray head includes an axial spray head 233 and two radial spray heads 234,
It respectively corresponding and is set at axial spout 231 and radial jet nozzle 232, axial spray head 233, radial spray head 234 are siphon spray head,
The outlet of the air inlet connection gas pipeline 222 of threeway spray head, axial spray head 233, radial spray head 234 on be respectively set first
Counterbalance valve 235, the second counterbalance valve 236, using the characteristic of counterbalance valve, the first counterbalance valve 235, the second counterbalance valve 236 can be to gas
Pressure in body pipeline 222 is stablized, and fluctuation of the siphon spray head in work due to the siphon flow generated and pressure is prevented.
It is fed the outlet of drilling rod 22 and check valve, check valve packet is set between abrasive material pipeline 221 and gas pipeline 222
Valve block 241 and multiple springs 242 are included, valve block 241 is the hemispherical configuration of top setting opening, and valve block 241 is elastic sheet metal,
The bottom of valve block 241 is fixedly connected with the inner wall of abrasive material pipeline 221, and the top of valve block 241 is contacted with the outer wall of gas pipeline 222
Connection, the both ends of spring 242 are individually fixed in the top and bottom of valve block 241, ensure that abrasive material will not reverse reflux.In siphon
When spray head works, due to gradually becoming smaller with nozzle cross-section, the pressure of compressed gas increases, and flow velocity increases with it, at this moment mixed
It closes and generates a vacuum degree in chamber 23, cause to form pressure difference between mixing chamber 23 and abrasive material pipeline 221, acted in pressure difference
Under, spring 242 stretches, and check valve is opened, and abrasive material is inhaled into mixing chamber 23, and abrasive material is mixed with high-speed gas in mixing chamber 23,
Thus by abrasive material high speed ejection.
The broken coal method that device for coal is broken using above-mentioned rear compound abrasive gas jet, is included the following steps:
1) abrasive material is added between abrasive material pipeline 221 and gas pipeline 222, according to two kinds of broken coal sides of auxiliary bore hole and slot
The broken coal pressure of formula needs, and sets cracking pressure, setup pressure value difference to the first counterbalance valve 235, the second counterbalance valve 236 respectively
For Pz、Pj。
When selecting auxiliary bore hole to break coal mode, meet: 5MPa≤Pz< Pj≤10MPa；
When selecting slot to break coal mode, meet: 5MPa≤Pj≤ 10MPa < Pz；
When rotating auxiliary bore hole and two kinds of slot broken coal modes work at the same time, meet: 5MPa≤Pz=Pj≤10MPa。
2) it is automatically turned on when the first all pressure reducing valves 16 being set pressure as 2MPa, and by the second all pressure reducing valves 17
It is automatically turned on when setting pressure as P1, the value range of P1 are as follows: P1 > 10MPa.Air-supply pipeline 14 is connected to the air on well again
Compressor makes air compressor be passed through gas into tank body 11, and observes the registration of pressure gauge.Wherein, the confession of air compressor
Wind pressure force value is greater than 2MPa, recycles the characteristic of pressure reducing valve, air compressor is when passing through the first pressure reducing valve 16, into tank body 11
Can stablize for wind pressure in 2MPa.
3) when the registration of pressure gauge reaches 2MPa, all refrigerating plants 18 are opened, and refrigerating plant 18 is set into temperature
Angle value is that T1 cools down to tank body 11, while observing the registration of pressure gauge.Wherein, the value range of T1 are as follows: 77K≤T1≤
124K。
4) according to the equation of gas state: PV=nRT, when temperature T is reduced in tank body 11, pressure P decline in tank body 11, when
When the registration of pressure gauge is less than 2MPa, air compressor can be passed through gas into tank body 11 again, refrigerating plant 18 during this
The gas in tank body 11 is persistently set to cool down, until pressure gauge registration reaches 2MPa again and remains constant in 10min-15min, table
Show that the pressure in tank body 11 reaches equalization point, closes all refrigerating plants 18 at this time.
Wherein: P is the pressure in tank body 11, and V is the volume of tank body 11, and n is the amount of gaseous matter, and T is in tank body 11
Temperature, R are ideal gas constant.
5) all heating plants 19 are opened, and are that T2 heats tank body 11 by 19 set temperature value of heating plant,
Wherein, the value range of T2 are as follows: 385K≤T2≤620K.Until pressure gauge registration reaches certain certain value again and maintains 10min-
It is constant in 15min, close heating plant 19.
6) according to selected broken coal mode, all the second pressure reducing valve 17 setting pressure is adjusted to P2, and start brokenly
Coal work, wherein the value and P of P2z、PjIn lesser one it is equal.
7) when pressure gauge registration is less than P2, all refrigerating plants 18 are again turned on, and refrigerating plant 18 is set into temperature
Angle value is that T1 cools down to tank body 11, then repeatedly step 4), 5).
8) after breaking coal operation completion, air compressor, refrigerating plant 18, heating plant 19 are closed, and tear open to each component
Unload recycling.
In above-mentioned steps, the case where the volume V of tank body 11, the amount n of gaseous matter and ideal gas constant R are definite value
Under, the temperature T in tank body 11 is directly proportional to the pressure P in tank body 11, so that the value of T1, T2 meet: T1/2=T2/P, P are tank
Pressure in body 11.
For the air feed component being arranged in parallel below by three groups, above-mentioned three kinds broken coal modes are described in detail:
One: the first counterbalance valve 235 of embodiment sets cracking pressure PzFor 5Mpa, the second counterbalance valve 236 sets cracking pressure Pj
For 10Mpa, all the second pressure reducing valve 17 setting pressure is adjusted to 5Mpa, at this point, according to the opening feature of counterbalance valve, first
Counterbalance valve 235 is opened, and the second counterbalance valve 236 is closed, and axial spray head 233 starts auxiliary bore hole work, at this time the drill bit of drilling machine 20
In rotation status, with the propulsion of drilling rod 21, it is straight that the high-pressure abrasive material gas jet that axial spray head 233 sprays can increase drilling
Diameter reaches auxiliary bore hole purpose.
Two: the first counterbalance valve 235 of embodiment sets cracking pressure PzFor 15Mpa, the second counterbalance valve 236 sets cracking pressure
PjFor 8Mpa, all the second pressure reducing valve 17 setting pressure is adjusted to 8Mpa, at this point, the first counterbalance valve 235 is closed, the second back
Pressure valve 236 is opened, and radial spray head 234 starts slot work, and the drill bit of drilling machine 20 is in static condition at this time, with drilling rod 21
It promotes, coal is cut out a gap by the high-pressure abrasive material gas jet that radial spray head 234 sprays, and achievees the purpose that slot.
Three: the first counterbalance valve 235 of embodiment, the second counterbalance valve 236 set cracking pressure Pz、PjIt is 8Mpa, it will be all
Second pressure reducing valve 17 setting pressure is adjusted to 8Mpa, at this point, the first counterbalance valve 235, the second counterbalance valve 236 are opened, it is axial to spray
First 233, radial spray head 234 starts simultaneously at work.The auxiliary bore hole stage is first turned on, the drill bit of drilling machine 20 is in rotation status,
Using the high-pressure abrasive material gas jet that threeway spray head sprays bore diameter is become larger during drilling rod 21 promotes, reaches auxiliary
Help the effect of drilling.It is then turned on the slot stage, drilling machine 20 is arranged to stationary state and carries out push rod at this time, is moving back bar mistake
Cheng Zhong carries out slot to coal using the high-pressure abrasive material gas jet that radial spray head 234 sprays, achievees the purpose that slot.
P in embodiment described abovez、PjValue it is not unique, need to be selected according to practical broken coal operation or work standard, only
Meet above-mentioned Pz、PjValue range.
In conclusion the utility model carries out tank body 11 using liquid nitrogen cycle refrigeration system and oil bath circulating heat supply system
Refrigeration or heating, to obtain brokenly the high pressure gas of pressure needed for coal, it is hidden to avoid safety of the air pressure pump in down-hole application
Suffer from.Compared to front mixing abrasive gas jet feeding system, the utility model is using compound abrasive and gas in mixing chamber 23
Jet stream avoids and occurs blocking pipeline, abrasion drilling rod problem in down-hole application.The utility model passes through design feed drilling rod
22, existing drilling rod is divided into abrasive material pipeline 221 and gas pipeline 222, cooperates abrasive material to be formed on the basis of being passed through high pressure gas
High-pressure abrasive material gas jet improves brokenly coal effect.Jet stream is effectively accelerated using Laval-cavity nozzle, improves auxiliary bore hole and slot
Broken coal effect is equivalent to the waterpowerization such as water jet slot, hydraulic flushing in hole in the prior art and breaks coal mode, can be avoided drilling and collapse
It collapses, while improving jet impact force, expand relief range.
The above is to combine specific embodiment further detailed description of the utility model, and it cannot be said that originally
Utility model specific implementation is limited only to this；Belonging to the utility model and for those skilled in the technology concerned,
Under the premise of technical solutions of the utility model thinking, made expansion and the replacement of operating method, data should all be fallen in
Within scope of protection of the utility model.
Claims (8)
1. device for coal is broken in compound abrasive gas jet after a kind of, it is characterised in that: set including drilling assembly and at least two groups parallel connection
The air feed component set；
The air feed component includes tank body, and pressure gauge is provided on tank body, and the both ends of tank body are respectively communicated with the outlet of air inlet pipeline
Mouthful and outlet pipe air inlet, the air inlet Correspondent of the air inlet pipeline of each air feed component to air-supply pipeline, outlet pipe
The first pressure reducing valve, the second pressure reducing valve is respectively set on air inlet pipeline, outlet pipe to pressure duct in gas outlet Correspondent, tank body
Outer wall both ends are provided with refrigerating plant, are provided with heating plant in the middle part of the outer wall of tank body；
The drilling assembly includes drilling machine, and the drilling rod import of drilling machine connects pressure duct, and the drilling rod outlet connection feed of drilling machine bores
Bar, the feed drilling rod includes abrasive material pipeline and the gas pipeline for being sheathed on abrasive material pipeline inside center, is fed the import of drilling rod
And ring baffle is fixedly installed between abrasive material pipeline and gas pipeline, multiple air inlets are offered on ring baffle, are fed
The mixing chamber that the outlet setting of drilling rod is connected to abrasive material pipeline, mixing chamber include one and the feed consistent axis of drilling rod export direction
To the radial jet nozzle of spout and two opposition settings, threeway spray head is set, threeway spray head includes an axial spray head in mixing chamber
It with two radial spray heads, respectively corresponds and is set at axial spout and radial jet nozzle, the air inlet of threeway spray head connects flue
The outlet in road is fed the outlet of drilling rod and check valve is arranged between abrasive material pipeline and gas pipeline.
2. device for coal is broken in compound abrasive gas jet after as described in claim 1, it is characterised in that: the check valve includes valve
Piece and multiple springs, the valve block are the hemispherical configuration of top setting opening, and the bottom of valve block and the inner wall of abrasive material pipeline are solid
Fixed connection, the top of valve block and the outer wall of gas pipeline connect, and the both ends of the spring are individually fixed in the top of valve block
The bottom and.
3. device for coal is broken in compound abrasive gas jet after as claimed in claim 2, it is characterised in that: the valve block is elasticity gold
Belong to piece.
4. device for coal is broken in compound abrasive gas jet after as described in claim 1, it is characterised in that: the axial direction spray head, diameter
The first counterbalance valve, the second counterbalance valve are respectively set on spray head.
5. device for coal is broken in compound abrasive gas jet after as described in claim 1, it is characterised in that: the refrigerating plant is liquid
Nitrogen cycle refrigeration system, the heating plant are oil bath circulating heat supply system.
6. device for coal is broken in compound abrasive gas jet after as described in claim 1, it is characterised in that: the axial direction spray head, diameter
It is siphon spray head to spray head.
7. device for coal is broken in compound abrasive gas jet after as described in claim 1, it is characterised in that: the axial direction spout, diameter
Laval-cavity nozzle is provided on spout.
8. device for coal is broken in compound abrasive gas jet after as described in claim 1, it is characterised in that: the drilling rod of the drilling machine with
The junction setting high pressure sealing of pressure duct rotates adapter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822158951.8U CN209398356U (en) | 2018-12-21 | 2018-12-21 | Device for coal is broken in compound abrasive gas jet after a kind of |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822158951.8U CN209398356U (en) | 2018-12-21 | 2018-12-21 | Device for coal is broken in compound abrasive gas jet after a kind of |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209398356U true CN209398356U (en) | 2019-09-17 |
Family
ID=67895653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822158951.8U Expired - Fee Related CN209398356U (en) | 2018-12-21 | 2018-12-21 | Device for coal is broken in compound abrasive gas jet after a kind of |
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| CN (1) | CN209398356U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113431498A (en) * | 2021-07-21 | 2021-09-24 | 辽宁工程技术大学 | Pulse gas coal breaking and reaming device |
-
2018
- 2018-12-21 CN CN201822158951.8U patent/CN209398356U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113431498A (en) * | 2021-07-21 | 2021-09-24 | 辽宁工程技术大学 | Pulse gas coal breaking and reaming device |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190917 Termination date: 20191221 |