CN103323328A - Gas sealing device and test method for coal rock impact test - Google Patents

Gas sealing device and test method for coal rock impact test Download PDF

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Publication number
CN103323328A
CN103323328A CN2013102874797A CN201310287479A CN103323328A CN 103323328 A CN103323328 A CN 103323328A CN 2013102874797 A CN2013102874797 A CN 2013102874797A CN 201310287479 A CN201310287479 A CN 201310287479A CN 103323328 A CN103323328 A CN 103323328A
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China
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gas
tight silo
bar connection
sample
transmission bar
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CN2013102874797A
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CN103323328B (en
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谢广祥
殷志强
王磊
胡祖祥
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Anhui University of Science and Technology
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Anhui University of Science and Technology
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Abstract

The invention provides a test sample gas sealing device for a gas-enriched coal rock gas solid coupling state impact test so as to research the impact mechanical property of a gas-enriched gas coal rock. The device comprises a support, a gas sealing storehouse, a sealing storehouse cover, a transmission rod connecting end, an incident rod connecting end, a transmission rod, an incident rod, an O-shaped sealing ring, a YX-shaped sealing ring, an incident rod connecting end and storehouse cover fixing bolt, a transmission rod connecting end and sealing storehouse fixing bolt, a gas inlet hole, a gas outlet hole, an electromagnetic adjusting control valve, a gas inlet adjusting gas valve, a gas tank, a gas outlet gas valve, a gas suction pump, a high-frequency gas gas-pressure sensor, a super-dynamic gas pressure acquisition instrument, a gas pressure monitoring instrument, a computer, a balance adjusting bolt and a fixing bolt. By adoption of the device, the gas content of a test sample is constant in the impact stress wave loading process in the gas-enriched gas coal rock impact test process. A unique test device is provided for research on the mechanical property of the gas coal rock.

Description

Gas packoff and the experimental technique of coal petrography impact experiment
Technical field
The invention belongs to coal petrography mechanical property testing technical field, more specifically, relate to a kind of sample gas packoff and experimental technique that gas coal rock Gas-solid Coupling state impacts loading experiment that be rich in.
Background technology
In the recovery process of underground coal resource, coal petrography is in the gas state that is rich in, during back production a large amount of use mechanizations to combine to adopt cutting coal machine coal petrography is carried out fragmentation, the goaf top plate cycle strides and brings power to load to workplace coal containing methane gas rock mass simultaneously, and this just needs to be grasped the dynamic characteristics of coal containing methane gas rock.These dynamic characteristics normally by experiment the chamber carry out all kinds of impact experiments and obtain, use at present extensively and the reliable impact experiment system of result is SHPB(split Hopkinson pressure bar, split hopkinson press bar) device, and improved various deformation device thus.
In traditional SHPB experiment, institute's test sample is exposed among the air often, composes in the gas exposure air of depositing in the coal petrography desorption of mash gas effect will occur, and causes methane gas disengaging in the coal petrography sample, almost no longer contains methane gas in the sample.Yet, China's coal seam major part is the coal seam of containing the Permo-carboniferous period that enriches gas (mainly being methane CH4), continuous increase along with the coal resources back production degree of depth, the coal and rock gas bearing capacity also is increase trend, unmind coal body and be in the gas state that is rich in, gas pressure at deep under ground can reach more than the 10MPa, and gas bearing capacity is higher than gas bearing capacity in the traditional experiment sample far away in the coal and rock, its mechanical characteristic also with the traditional experiment result again than big difference.When the working seam gas bearing capacity is less, coal petrography Experiments of Machanics result application without gas adsorption is more reasonable with mining engineering design and construction, and when entering the high gas bearing seam mining in deep, under high gas pressure absorption environment, the mechanical characteristic of coal containing methane gas rock mass and traditional experiment result have obvious difference.Correlative study shows: determined mine type during shallow mining, and after entering deep mining, the phenomenon that the type of mine also changes.Be mainly manifested in following four aspects: (1) hard rock mine is to the conversion of soft rock mine; (2) low gaseous mine is to the transformation of gassy mine; (3) non-prominent mine is to the transformation of projecting mine; (4) non-impact mine is to the transformation of impacting mine.Cause that the basic reason that mine makes the transition is to enter behind the deep mining because the change of geomechanics environment causes the conversion of deep coal petrography, gas characteristic.In the underground coal resource exploitation process, coal petrography in the coal seam all is to be in the gas state that is rich in, coal petrography gas is to affect the colliery whether one of key factor of coal and gas dynamical disaster occurs, and it is completely different that its coal containing methane gas rock crash characteristics and tradition do not contain the gas state.Therefore, develop corresponding coal petrography and tested the work of demanding urgently carrying out into current coal petrography mechanics field with the crash characteristics that the gas packoff is rich in gas coal rock.
The patent No. is that the Chinese utility model patent of CN201120313333.1 discloses a kind of solid coupling parameter tester for coal gas containing mashgas, is made of air supply unit, vacuum unit, monitoring means and control module; Vacuum unit is set whole air-channel system and Rock Mechanics Test And system and coal sample are bled, whole system is in is vacuum state; Adopt solenoid electric valve to implement automatic monitoring system; Adopt output pressure transmitter and displacement monitoring device to implement the measurement of experiment parameter; The monitoring, control and the data that adopt Surveillance center, computing machine and printer to implement experiment parameter are exported.But this solid coupling parameter tester for coal gas containing mashgas only can be carried out the experiment of static quasistatic loading and can't carry out experiment for the situation of dynamic load.
Summary of the invention
Carry out at the relatively ripe SHPB experimental provision of development and to be rich in the gas coal rock dynamic experiment, what at first will solve is gas adsorption coupling and the hermetic seal problem of experimentation coal petrography sample.The present invention is take the SHPB device as the basis, and the invention experimentation guarantees that sample does not leave the packoff of methane gas, and corresponding gordian technique and product are provided, and carries out the dynamic load experiment at SHPB.
Technical matters to be solved by this invention provides a kind of coal petrography sample of realizing and does not leave methane gas, guarantee coal petrography sample gas bearing capacity, guarantee the sample gas packoff that is used for being rich in the gas coal rock impact experiment of sample and incident bar, transmission bar Accurate align.
For solving the problems of the technologies described above, according to one side, the invention provides a kind of sample gas packoff that is rich in gas coal rock Gas-solid Coupling state impact experiment, comprise bearing, the device in Gas gas-tight silo, the gas-tight silo lid, the transmission bar connection end, the incident bar connection end, transmission bar, incident bar, the O RunddichtringO, the YX RunddichtringO, incident bar connection end and storehouse lid set bolt, transmission bar connection end and gas-tight silo set bolt, air admission hole, venthole, the electromagnetism adjusting control valve, the air inlet adjustment air valve, the gas gas tank, the air valve of giving vent to anger, aspiration pump, high frequency device in Gas pressure sensor, super dynamic pressure acquisition instrument, the gas pressure monitor, computing machine, the balance adjustment bolt, and set bolt, it is characterized in that: bearing is provided with the device in Gas gas-tight silo and at dismountable gas-tight silo lid of an end of device in Gas gas-tight silo, be provided with O-ring seal and gas-tight silo lid set bolt at device in Gas gas-tight silo and gas-tight silo lid junction, have emptying aperture at device in Gas gas-tight silo and gas-tight silo lid axial centre position, two emptying aperture places are provided with respectively transmission bar connection end and incident bar connection end, the transmission bar connection end links to each other with transmission bar, the incident bar connection end links to each other with incident bar, at the device in Gas gas-tight silo, gas-tight silo lid and transmission bar connection end, incident bar connection end junction is provided with O RunddichtringO and YX RunddichtringO, incident bar connection end and storehouse lid set bolt and six transmission bar connection ends and gas-tight silo set bolt, cover at gas-tight silo and to be provided with air admission hole and venthole, air admission hole is connected with the gas gas tank by the air inlet adjustment air valve by the electromagnetism adjusting control valve, venthole is connected with aspiration pump by the air valve of giving vent to anger, be provided with high frequency device in Gas pressure sensor in device in Gas gas-tight silo central upper portion position and link to each other with computing machine by the gas pressure monitor by super dynamic pressure acquisition instrument, four jiaos are provided with levelling device and stationary installation in the bearing bottom.
Further, the transmission bar connection end and the incident bar connection end that are arranged on device in Gas gas-tight silo and gas-tight silo lid axial centre position are the Asia font, be provided with at outstanding position and be fixed in transmission bar connection end that device in Gas gas-tight silo and gas-tight silo cover and gas-tight silo set bolt and incident bar connection end and storehouse and cover set bolt, and O-ring seal.
Further, described levelling device is to be located under the described bearing four balance adjustment bolts of four jiaos.
Further, described stationary installation is four set bolts that are located at described bearing both sides.
According to a further aspect in the invention, provide a kind of sample device in Gas close experimental technique, comprised the steps:
(1) will be according to claim 1 one of-4 described sample gas packoffs vertically place;
(2) transmission bar connection end and O-ring seal are placed on device in Gas gas-tight silo central hole, use transmission bar connection end and gas-tight silo set bolt with device in Gas gas-tight silo fixing seal;
(3) the coal petrography sample is placed on the transmission bar connection end in the device in Gas gas-tight silo, coal petrography sample and transmission bar connection end are axially aligned;
(4) the incident bar connection end is placed on coal petrography sample top, guarantees that transmission bar connection end, sample, incident bar connection end three axially align;
(5) the gas-tight silo lid is placed on device in Gas gas-tight silo and incident bar connection end top, by O-ring seal, gas-tight silo lid set bolt, incident bar connection end and storehouse lid set bolt, fixed bin lid, incident bar connection end guarantee that simultaneously the sample in the device in Gas gas-tight silo is in sealing state;
(6) the sample gas packoff level after will fixing is put on the experiment table, by regulating the balance adjustment nut of four jiaos of bottoms of bearing, incident bar is contacted with intact with the Accurate align of transmission bar with the transmission bar connection end with the incident bar connection end;
(7) connect venthole and the air valve of giving vent to anger, connect air admission hole and air inlet adjustment air valve;
(8) open give vent to anger air valve and aspiration pump, the gas in the described sample gas gas check is drawn out of, the coal petrography sample is in vacuum state;
(9) close give vent to anger air valve and aspiration pump, open air inlet adjustment air valve and gas gas tank, make methane gas be filled with described sample gas packoff, regulate the air inlet adjustment air valve and make device in Gas be pressed in one section Preset Time of maintenance under the pressure constant state, until the coal petrography sample is in the gas state that is rich in;
(10) mobile absorbing rod aligns the tight axle center of itself and transmission bar;
(11) unclamp incident bar connection end and storehouse lid set bolt;
(12) open data acquisition system (DAS), this data acquisition system (DAS) is traditional SHPB equipment, is used for gathering the stress wave signal of incident bar and throwing-stick, and its structure is common practise to those skilled in the art;
(13) close the air inlet adjustment air valve;
(14) emission drift, drift bump incident bar produces stress wave, and stress wave imports the coal petrography sample into by the incident bar connection end, and imports transmission bar into and import absorbing rod into by the transmission bar connection end;
(15) data acquisition system (DAS) collects stress wave signal on incident bar and the transmission bar by foil gauge, carries out data by the data-signal that collects and processes, and obtains the dynamic characteristics curve of coal petrography under this gas pressure;
(16) super dynamic pressure acquisition instrument collects stress wave by high frequency device in Gas pressure sensor and loads gas pressure variation characteristic curve in the coal petrography sample process.
The present invention has following beneficial effect: the sample gas packoff that is used for being rich in the gas coal rock impact experiment that adopts technique scheme, by gas-tight silo and Cang Gai, gas-tight silo and transmission bar connection end, Cang Gai and incident bar connection end, the O-ring seal at totally three places and set bolt, can make coal petrography sample and methane gas be in sealing state, avoid a large amount of of methane gas to scatter and disappear, guaranteed the gas state that is rich in of sample; But be installed in four balance adjustment screw up-down adjustment under the bearing, ensure in the SHPB device incident bar, throwing-stick respectively with incident bar connection end, transmission bar connection end center-aligned, and keep good contact at end face; Be installed in four set bolts under the bearing, can with SHPB device pedestal close contact, can guarantee that the position of gas packoff and SHPB device is fixed; By mutually combining with the SHPB device, can realize being rich under the gas coal rock Gas-solid Coupling state and impact dynamic load, gas coal rock shock stress ripple load mode is rich in simulation, is rich in the destruction characteristic that the gas characteristic reproducibly descends the on-the-spot coal and rock of coal back production loaded by power by the coal petrography sample.In the coal exploitation process of further research and probe deep, adopt disturbance and bring out coal and gas dynamical disaster mechanism, and then for deepen coal resource safety, efficiently back production provides theoretical foundation.
In sum, the present invention is that a kind of experimentation coal petrography sample of realizing does not leave methane gas, guarantee that the coal petrography sample is in Gas-solid Coupling state and gas bearing capacity, guarantee the sample gas packoff that is used for being rich in gas coal rock Gas-solid Coupling state impact experiment of sample and incident bar, transmission bar Accurate align.
Description of drawings
Fig. 1 (a) is traditional SHPB structural representation.
Fig. 1 (b) is the structural representation of the sample gas packoff be used to being rich in gas coal rock Gas-solid Coupling state impact experiment according to an embodiment of the invention;
Fig. 2 is the sample gas packoff cut-open view be used to being rich in gas coal rock Gas-solid Coupling state impact experiment according to an embodiment of the invention;
Fig. 3 is the left view of the sample gas packoff be used to being rich in gas coal rock Gas-solid Coupling state impact experiment according to an embodiment of the invention as shown in Figure 2;
Fig. 4 is the right view of the sample gas packoff be used to being rich in gas coal rock Gas-solid Coupling state impact experiment according to an embodiment of the invention as shown in Figure 2;
Fig. 5 is according to gas pressure variation characteristic curve in the stress wave loading coal petrography process of the embodiment of Fig. 2;
Fig. 6 is the dynamic stress strain curve of coal petrography under the 1MPa gas pressure that the embodiment according to Fig. 2 obtains.
Number in the figure:
The 1-drift; The 2-incident bar; The 3-foil gauge; The 4-sample; The 5-transmission bar; The 6-absorbing rod; 7-sample gas packoff; The 8-data acquisition system (DAS); 9-gas-tight silo lid set bolt; The 10-air admission hole; 11-incident bar connection end and storehouse lid set bolt; 12-incident bar connection end; The 13-venthole; 14-gas-tight silo lid; 15-balance adjustment bolt; The 16-O-ring seal; 17-transmission bar connection end; The 18-set bolt; 19-high frequency device in Gas pressure sensor; 20-device in Gas gas-tight silo; 21-transmission bar connection end and gas-tight silo set bolt; The 22-bearing; 23-air inlet adjustment air valve; 24-gas gas tank; The 25-air valve of giving vent to anger; The 26-aspiration pump; The 27-O RunddichtringO; The 28-YX RunddichtringO; The super dynamic pressure acquisition instrument of 29-; 30-gas pressure monitor; 31-electromagnetism adjusting control valve; The 32-computing machine; The 33-SHPB experiment table; 34-gas gas-tight silo emptying aperture; 35-gas-tight silo lid emptying aperture.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are further described.
Referring to Fig. 1 (b), show the structural representation of the sample gas packoff be used to being rich in gas coal rock Gas-solid Coupling state impact experiment according to an embodiment of the invention.Compare the traditional SHPB structural representation shown in Fig. 1 (a), Fig. 1 (b) is the equipment schematic diagram after traditional SHPB loads new equipment.
Among Fig. 1 (b), drift 1 is to incident bar 2 motions, incident bar 2, transmission bar 5, absorbing rod 6 conllinear, be provided with sample gas packoff 7 between the incident bar connection end 12 of incident bar 2 and the transmission bar connection end 17 of transmission bar 5, sample gas packoff 7 interior placement samples 4, and sample 4 and incident bar 2, transmission bar 5, absorbing rod 6 conllinear, transmission bar 5 is connected with transmission bar 5 away from an end of transmission bar connection end 17.Incident bar 2, the transmission bar 5 interior foil gauges 3 that arrange respectively, twisted pair line connection is passed through with incident bar 2 and transmission bar 5 respectively by foil gauge 3 in the two ends of data acquisition system (DAS) 8.The bottom of sample gas packoff 7 is connected with 3 pipelines: article one connects aspiration pump 26 by the air valve 25 of giving vent to anger; Second is connected with the air inlet adjustment air valve by electromagnetism adjusting control valve 31 and is connected gas gas tank 24; Article three, connect gas pressure monitor 30 by super dynamic pressure acquisition instrument 29.Wherein, gas pressure monitor 30 is also connected to electromagnetism adjusting control valve 31.The other end of gas pressure monitor 30 connects computing machine 32 by signal transmssion line (such as data flat cable etc.).Wherein, the pore on aspiration pump 26 equipment such as grade and air inlet adjustment air valve 23 and the air valve 25 of giving vent to anger, and with gas gas tank 24 between be connected with the rubber tracheae.Wherein, acting as of absorbing rod 6: when stress wave imports the distal head of absorbing rod 6 into, to change tensile stress wave into by original compression stress wave, cause absorbing rod 6 and throwing-stick to break away from, with the stress wave energy in the walking system, guarantee that incident bar and throwing-stick remain static in experimentation.
Referring to Fig. 2-3, Fig. 2 is the axis profile figure of gas-tight silo, and gas-tight silo is right cylinder, does section along cylindrical high line, obtains Fig. 2.The structure of sample gas packoff 7 is: bearing 22 is provided with device in Gas gas-tight silo 20 and at dismountable gas-tight silo lid 14 of an end of device in Gas gas-tight silo 20, cover 14 junctions at device in Gas gas-tight silo 20 and gas-tight silo and be provided with O-ring seal 16 and six gas-tight silos lid set bolts 9, cover 14 axial centre positions at device in Gas gas-tight silo 20 and gas-tight silo and have gas gas-tight silo emptying aperture 34 and gas-tight silo lid emptying aperture 35, two emptying aperture places are provided with respectively transmission bar connection end 17 and incident bar connection end 12, transmission bar connection end 17 links to each other with transmission bar 5, incident bar connection end 12 links to each other with incident bar 2, at device in Gas gas-tight silo 20, gas-tight silo lid 14 and transmission bar connection end 17, incident bar connection end 12 junctions are provided with O RunddichtringO 27 and YX RunddichtringO 28, six incident bar connection ends and storehouse lid set bolt 11 and six transmission bar connection ends and gas-tight silo set bolt 21, be provided with air admission hole 10 and venthole 13 at gas-tight silo lid 14, air admission hole 10 connects electromagnetism adjusting control valve 31 by the rubber gas piping and is connected with gas gas tank 24 by signal transmssion line connection air inlet adjustment air valve 23, venthole 13 connects the air valve 25 of giving vent to anger by signal transmssion line and is connected with aspiration pump 26, be provided with high frequency device in Gas pressure sensor 19 in device in Gas gas-tight silo 20 central upper portion positions and link to each other with computing machine 32 by signal transmssion line connection gas pressure monitor 30 by the super dynamic pressure acquisition instrument 29 of signal transmssion line connection, be provided with four balance adjustment bolts 15 and four set bolts 18 four jiaos of bearing 22 bottoms.
Be arranged on transmission bar connection end 17 and the incident bar connection end 12 that device in Gas gas-tight silo 20 and gas-tight silo cover 14 axial centre positions and be the Asia font, to have the transmission bar connection end that is fixed on device in Gas gas-tight silo 20 and the gas-tight silo lid 14 and gas-tight silo set bolt 21 and incident bar connection end and storehouse to cover set bolt 11 at outstanding position, and O-ring seal 16.
Gas pressure control is arranged by the gas pressure monitor 30 of computing machine 32 controls, high frequency device in Gas pressure sensor 19 is mutual with gas pressure monitor 30 signals respectively by the super dynamic pressure acquisition instrument 29 of signal transmssion line connection, electromagnetism adjusting control valve 31, and computing machine 32 connects gas pressure monitor 30 by signal transmssion line and implements gas pressures control and the super dynamic acquisition of dynamic load process gas pressure parameter.
Fig. 4 is the right view of the sample gas packoff be used to being rich in gas coal rock Gas-solid Coupling state impact experiment according to an embodiment of the invention as shown in Figure 2.Wherein describe 6 gas-tight silos lid set bolts 9 and 6 incident bar connection ends and storehouse in detail and cover relative position relation and their positional structures in the embodiment of Fig. 2 of set bolt 11.Incident bar connection end and storehouse lid set bolt 11 are 6 bolts that are evenly arranged along the cylinder end face, just only draw two up and down in sectional view.
The experimental technique of the sample gas packoff be used to being rich in gas coal rock Gas-solid Coupling state impact experiment of the present invention is as follows:
Dynamic this structure of coal petrography under the SHPB of gas-tight silo device test methane gas 2MPa.
(1) at first sample gas packoff of the present invention is vertically placed;
(2) transmission bar connection end 17 and O-ring seal 28 are placed on device in Gas gas-tight silo emptying aperture 34 places, use gas-tight silo set bolt 21 with transmission bar connection end 17 and device in Gas gas-tight silo 20 fixing seals;
(3) coal petrography sample 4 is placed on the transmission bar connection end 17 in the device in Gas gas-tight silo 20, coal petrography sample 4 and transmission bar connection end 17 are axially aligned;
(4) incident bar connection end 12 is placed on coal petrography sample 4 tops, guarantees that transmission bar connection end 17, sample 4, incident bar connection end 12 threes axially align;
(5) gas-tight silo lid 14 is placed on device in Gas gas-tight silo 20 and incident bar connection end 12 tops, by O-ring seal 16, gas-tight silo lid set bolt 9, incident bar connection end and storehouse lid set bolt 11, fixed bin lid 14, incident bar connection end 12 guarantee that simultaneously the sample 4 in the device in Gas gas-tight silo 20 is in sealing state;
(6) the sample gas packoff level after will fixing is put on the experiment table, by regulating the balance adjustment nut 15 of four jiaos of bottoms of bearing, incident bar 2 is contacted with intact with the Accurate align of transmission bar 5 with incident bar connection end 12 and transmission bar connection end 17;
(7) connect venthole 13 and the air valve 25 of giving vent to anger, connect air admission hole 10 and air inlet adjustment air valve 23;
(8) open give vent to anger air valve 25 and aspiration pump 26, the gas in the described sample gas gas check is drawn out of, coal petrography sample 4 is in vacuum state;
(9) close give vent to anger air valve 25 and aspiration pump 26, open air inlet adjustment air valve 23 and gas gas tank 24, make methane gas be filled with described sample gas packoff, regulate air inlet adjustment air valve 23 and make device in Gas be pressed in one section Preset Time of maintenance under the pressure constant state, until coal petrography sample 4 is in the gas state that is rich in;
(10) mobile absorbing rod 6 makes it contact with transmission bar 5 and align in the axle center, wherein, axially is the horizontal direction among Fig. 1 (b);
(11) unclamp incident bar connection end and storehouse lid set bolt 11;
(12) open data acquisition system (DAS) 8;
(13) close air inlet adjustment air valve 23;
(14) emission drift 1, drift 1 bump incident bar 2 produces stress wave, and stress wave imports coal petrography sample 4 into by incident bar connection end 12, and imports transmission bar 5 into and import absorbing rod 6 into by transmission bar connection end 17;
(15) data acquisition system (DAS) 8 collects stress wave signal on incident bar 2 and the transmission bar 5 by foil gauge 3, carries out data by the data-signal that collects and processes, and obtains the dynamic characteristics curve of coal petrography under this gas pressure, as shown in Figure 5;
(16) super dynamic pressure acquisition instrument 29(or title " super dynamic gas pressure Acquisition Instrument ", " gas pressure measurement instrument ") collect stress wave by high frequency device in Gas pressure sensor 19 and load gas pressure variation characteristic curve in coal petrography sample 4 processes (that is, stress wave enters process sample and the Afferent Projections bar from incident bar).The dynamic stress strain curve of example coal petrography as shown in Figure 6 under the 1MPa gas pressure.
Each above embodiment is described preferred implementation of the present invention; be not that scope of the present invention is limited; design under the prerequisite of spirit not breaking away from the present invention; various distortion and improvement that the common engineering technical personnel in this area make technical scheme of the present invention all should fall in the definite protection domain of claims of the present invention.

Claims (5)

1. sample gas packoff that is rich in gas coal rock Gas-solid Coupling state impact experiment, comprise bearing (22), device in Gas gas-tight silo (20), gas-tight silo lid (14), transmission bar connection end (17), incident bar connection end (12), transmission bar (5), incident bar (2), O RunddichtringO (27), YX RunddichtringO (28), incident bar connection end and storehouse lid set bolt (11), transmission bar connection end and gas-tight silo set bolt (21), air admission hole (10), venthole (13), electromagnetism adjusting control valve (31), air inlet adjustment air valve (23), gas gas tank (24), the air valve (25) of giving vent to anger, aspiration pump (26), high frequency device in Gas pressure sensor (19), super dynamic gas pressure Acquisition Instrument (29), gas pressure monitor (30), computing machine (32), balance adjustment bolt (15), and set bolt (18), it is characterized in that: bearing (22) is provided with device in Gas gas-tight silo (20) and at dismountable gas-tight silo lid (14) of an end of device in Gas gas-tight silo (20), be provided with O-ring seal (16) and gas-tight silo lid set bolt (9) at device in Gas gas-tight silo (20) and gas-tight silo lid (14) junction, have emptying aperture at device in Gas gas-tight silo (20) and gas-tight silo lid (14) axial centre position, two emptying aperture places are provided with respectively transmission bar connection end (17) and incident bar connection end (12), transmission bar connection end (17) links to each other with transmission bar (5), incident bar connection end (12) links to each other with incident bar (2), in device in Gas gas-tight silo (20), gas-tight silo lid (14) and transmission bar connection end (17), incident bar connection end (12) junction is provided with O RunddichtringO (27) and YX RunddichtringO (28), incident bar connection end and storehouse lid set bolt (11) and six transmission bar connection ends and gas-tight silo set bolt (21), be provided with air admission hole (10) and venthole (13) at gas-tight silo lid (14), air admission hole (10) is connected with gas gas tank (24) by air inlet adjustment air valve (23) by electromagnetism adjusting control valve (31), venthole (13) is connected with aspiration pump (26) by the air valve of giving vent to anger (25), be provided with high frequency device in Gas pressure sensor (19) in device in Gas gas-tight silo (20) central upper portion position and link to each other with computing machine (32) by gas pressure monitor (30) by super dynamic gas pressure Acquisition Instrument (29), be provided with levelling device and stationary installation four jiaos of bearing (22) bottoms.
2. the sample gas packoff that is rich in gas coal rock Gas-solid Coupling state impact experiment according to claim 1, it is characterized in that, the transmission bar connection end (17) and the incident bar connection end (12) that are arranged on device in Gas gas-tight silo (20) and gas-tight silo lid (14) axial centre position are the Asia font, be provided with transmission bar connection end and gas-tight silo set bolt (21) and incident bar connection end and the storehouse lid set bolt (11) that is fixed on device in Gas gas-tight silo (20) and the gas-tight silo lid (14) and O-ring seal (16) at outstanding position.
3. the sample gas packoff that is rich in gas coal rock Gas-solid Coupling state impact experiment according to claim 1 and 2 is characterized in that, described levelling device is to be located under the described bearing four balance adjustment bolts (15) of four jiaos.
4. the sample gas packoff that is rich in gas coal rock Gas-solid Coupling state impact experiment according to claim 1 and 2 is characterized in that, described stationary installation is four set bolts (18) that are located at described bearing both sides.
5. the close experimental technique of sample device in Gas comprises the steps:
(1) will be according to claim 1 one of-4 described sample gas packoffs vertically place;
(2) transmission bar connection end (17) and O-ring seal (16) are placed on device in Gas gas-tight silo (20) central hole, use transmission bar connection end (17) and gas-tight silo set bolt (21) with device in Gas gas-tight silo (20) fixing seal;
(3) coal petrography sample (4) is placed on the interior transmission bar connection end (17) of device in Gas gas-tight silo (20), coal petrography sample (4) and transmission bar connection end (17) are axially aligned;
(4) incident bar connection end (12) is placed on coal petrography sample (4) top, guarantees that transmission bar connection end (17), sample (4), incident bar connection end (12) three axially align;
(5) gas-tight silo lid (14) is placed on device in Gas gas-tight silo (20) and incident bar connection end (12) top, by O-ring seal (16), gas-tight silo lid set bolt (9), incident bar connection end and storehouse lid set bolt (11), fixed bin lid (14), incident bar connection end (12) guarantee that simultaneously the sample (4) in the device in Gas gas-tight silo (20) is in sealing state;
(6) the sample gas packoff level after will fixing is put on the experiment table, by regulating the balance adjustment nut (15) of four jiaos of bottoms of bearing, incident bar (2) is contacted with intact with the Accurate align of transmission bar connection end (17) with transmission bar (5) with incident bar connection end (12);
(7) connect venthole (13) and the air valve of giving vent to anger (25), connect air admission hole (10) and air inlet adjustment air valve (23);
(8) open the air valve of giving vent to anger (25) and aspiration pump (26), the gas in the described sample gas gas check is drawn out of, coal petrography sample (4) is in vacuum state;
(9) close the air valve of giving vent to anger (25) and aspiration pump (26), open air inlet adjustment air valve (23) and gas gas tank (24), make methane gas be filled with described sample gas packoff, regulate air inlet adjustment air valve (23) and make device in Gas be pressed in one section Preset Time of maintenance under the pressure constant state, until coal petrography sample (4) is in the gas state that is rich in;
(10) mobile absorbing rod (6) makes it closely align in the axle center with transmission bar (5);
(11) unclamp incident bar connection end and storehouse lid set bolt (11);
(12) open data acquisition system (DAS) (8);
(13) close air inlet adjustment air valve (23);
(14) emission drift (1), drift (1) bump incident bar (2) produces stress wave, stress wave imports coal petrography sample (4) into by incident bar connection end (12), and imports transmission bar (5) into and import absorbing rod (6) into by transmission bar connection end (17);
(15) data acquisition system (DAS) (8) collects stress wave signal on incident bar (2) and the transmission bar (5) by foil gauge (3), carry out data by the data-signal that collects and process, obtain the dynamic characteristics curve of coal petrography under this gas pressure;
(16) super dynamic pressure acquisition instrument (29) collects stress wave by high frequency device in Gas pressure sensor (19) and loads gas pressure variation characteristic curve in coal petrography sample (4) process.
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