CN114659828A - Fixed point pressure maintaining sampling device for coal mine underground coal bed gas content determination - Google Patents
Fixed point pressure maintaining sampling device for coal mine underground coal bed gas content determination Download PDFInfo
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- CN114659828A CN114659828A CN202210271003.3A CN202210271003A CN114659828A CN 114659828 A CN114659828 A CN 114659828A CN 202210271003 A CN202210271003 A CN 202210271003A CN 114659828 A CN114659828 A CN 114659828A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
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Abstract
The invention discloses a fixed point pressure maintaining sampling device for coal mine underground coal seam gas content determination, which comprises: a flexible drill rod which is power-transmitted by an external driving system; the connecting sleeve is connected to the tail part of the flexible drill rod; the water driving mechanism is arranged in the connecting sleeve and is provided with an output end capable of rotating around the central axis of the water driving mechanism so as to drive the drill bit sleeve to rotate, a drill bit is arranged at one end of the drill bit sleeve, at least two drill bit holes penetrate through the drill bit, and after the drill bit is used for drilling to a specified position, a coal sample is collected through the drill bit holes; and the sampling mechanism at least comprises a sampling bin and a closed pressure maintaining mechanism, wherein the sampling bin is fixed in the drill bit sleeve and is used for collecting the coal sample from the drill bit hole, and the closed pressure maintaining mechanism can seal the periphery of the sampling bin.
Description
Technical Field
The invention relates to the technical field of coal mine underground coal seam gas content determination and sampling, in particular to a fixed point pressure maintaining sampling device used in the coal seam gas content determination by utilizing directional long drilling.
Background
The method for testing the gas content can be divided into a direct method and an indirect method 2, wherein the direct method is to firstly sample a coal sample, then directly measure the gas content of a coal bed by adopting a desorption method, the accuracy of the method depends on the exposure time of the coal sample and whether the sampling site is accurate, in order to ensure the accuracy of the sampling site, directional drilling is often carried out by using drilling equipment, then the drilling equipment is withdrawn and put into the sampling equipment, so that the sampling equipment is used for carrying out fixed-point sampling, and the problems of low sampling efficiency, long exposure time of the coal sample, gas dissipation and the like are caused.
Therefore, it is necessary to provide a fixed-point pressure-maintaining sampling device for measuring the gas content in the coal seam of the coal mine to solve the above problems.
Disclosure of Invention
In order to achieve the purpose, the invention provides the following technical scheme: colliery is coal seam gas content survey fixed point pressurize sampling device in pit includes:
a flexible drill rod which is power-transmitted by an external driving system;
the connecting sleeve is connected to the tail part of the flexible drill rod;
the water driving mechanism is arranged in the connecting sleeve and is provided with an output end capable of rotating around the central axis of the water driving mechanism so as to drive the drill bit sleeve to rotate, a drill bit is arranged at one end of the drill bit sleeve, at least two drill bit holes penetrate through the drill bit, and after the drill bit is used for drilling to a specified position, a coal sample is collected through the drill bit holes; and
the sampling mechanism at least comprises a sampling bin and a closed pressure maintaining mechanism, wherein the sampling bin is fixed in the drill bit sleeve and used for collecting coal samples from the drill bit hole, and the closed pressure maintaining mechanism can seal the periphery of the sampling bin.
Further, preferably, the closed pressure maintaining mechanism comprises a bidirectional flow limiting head, and the bidirectional flow limiting head is connected with the drill bit by adopting a plurality of first springs and is blocked on the drill bit hole;
the bidirectional flow limiting head is further connected with a sliding ring through a second spring, the sliding ring slides in the inner wall of the drill bit sleeve in a limiting mode, a plurality of sampling holes used for assisting sampling are formed in the circumferential array on the drill bit sleeve, and in the initial stage, the sampling holes can be plugged by the sliding ring.
Further, preferably, the slip ring is connected with the inner wall of the drill sleeve by a third spring.
Further, as preferred, the two-way current-limiting head includes first interception net and the second interception net of symmetry setting for intercept the coal cinder, be fixed with the taper groove between first interception net and the second interception net, the opening of taper groove towards drill bit hole direction one side is greater than the other side opening, still slide in the taper groove and be provided with the closing plate, the closing plate adopts the fourth spring to link to each other with the second interception net.
Further, preferably, the water driving mechanism comprises a rotor which is rotatably arranged in a stator, the stator is arranged in the inner wall of the connecting sleeve and can drive the rotor to rotate when the flushing liquid flows through a gap between the rotor and the stator;
the output of rotor is universal articulated with the transmission shaft, the other end of transmission shaft is fixed with the driving disc, the driving disc links to each other with the drill bit cover is sealed fixed, be provided with the control valve on the driving disc to with flush fluid water conservancy diversion to two-way current-limiting head position department, thereby see out the drill bit hole with the flush fluid.
Further, as preferred, the drill bit is sheathe in and is link up and be provided with the second drain pipe, the second drain pipe is located the transmission disc and is close to transmission shaft one side, be provided with valve body two in the second drain pipe, and when utilizing the sampling mechanism sample, valve body two is opened, and the control valve is closed.
Further, as preferred, the drill bit sleeve is provided with a first liquid outlet pipe in a penetrating mode, the first liquid outlet pipe is located on one side, close to the transmission shaft, of the transmission disc, a first valve body is arranged in the first liquid outlet pipe, a hydraulic cylinder is further fixed to the outer portion of the drill bit sleeve in the radial direction, the hydraulic cylinder is communicated with the first liquid outlet pipe, and a hydraulic head is arranged in the hydraulic cylinder in a sliding mode.
Further, as preferred, the one end in sample storehouse is for sealing the form, and the other end is fixed with the closing disc, a plurality of logical grooves have been seted up on the closing disc, it is provided with sealing disc to lead to the inslot rotation, sealing disc has rotary power.
Further, as preferred, flexible drilling rod includes a plurality of articulated universal joint in proper order, and is a plurality of universal joint sets up in the flexible cover, one side of flexible cover forms through screw thread sunken, and the other end forms through threaded connection head, screw thread sunken department is provided with the check valve, threaded connection head is used for linking to each other with the spread groove, the fixed embedding of spread groove is in the adapter sleeve.
Compared with the prior art, the invention provides a fixed-point pressure maintaining sampling device for measuring the gas content of an underground coal seam of a coal mine, which has the following beneficial effects:
in the embodiment of the invention, the control valve is arranged on the transmission disc so as to guide the flushing liquid to the position of the bidirectional flow limiting head when no sample is taken, and the flushing liquid is utilized to push the sealing plate to be far away from the first interception net so that the flushing liquid is sent out of a drill hole, thereby effectively realizing the cooling of the drill; while
When the drill bit takes a sample, the flushing fluid stops flowing towards the direction of the drill bit hole at the moment, part of the coal sample moves towards the drill bit hole under the action of the bit pressure and pushes the second interception net to be separated from the drill bit hole, so that the coal sample enters the drill bit sleeve, the sliding ring is pushed along with the second interception net, part of the coal sample enters the drill bit sleeve from the sample taking hole, and therefore the coal sample can be quickly sampled, and further the drilling equipment is combined with the sampling equipment, fixed-point sampling is realized in the drilling process, so that the equipment replacing step can be saved, the efficiency is improved, and the sampling precision can be improved by direct sampling after the drilling, meanwhile, closed pressure maintaining is realized in the sampling process of withdrawing the drill rod, and the accurate determination of the gas content of a coal seam is facilitated.
Drawings
FIG. 1 is a schematic view of the overall structure of a fixed-point pressure-maintaining sampling device for measuring the gas content in an underground coal seam of a coal mine;
FIG. 2 is a schematic structural diagram of a water driving mechanism and a sampling mechanism in a fixed-point pressure maintaining sampling device for measuring the gas content of an underground coal seam of a coal mine;
FIG. 3 is a schematic structural diagram of a closed pressure maintaining mechanism in a fixed-point pressure maintaining and sampling device for measuring the gas content in an underground coal seam of a coal mine;
FIG. 4 is a schematic structural diagram of a bidirectional flow-limiting head in a fixed-point pressure-maintaining sampling device for measuring the gas content in an underground coal seam of a coal mine;
FIG. 5 is a schematic structural diagram of a sealing plate in a fixed-point pressure-maintaining sampling device for measuring the gas content in an underground coal seam of a coal mine;
in the figure: 1. a universal joint; 2. a one-way valve; 3. a connector; 4. a flexible sleeve; 5. connecting sleeves; 6. connecting grooves; 7. a water drive mechanism; 8. a bit sleeve; 9. a sampling mechanism; 10. a drill bit; 11. drilling a bit hole; 12. a righting frame; 13. a first liquid outlet pipe; 14. a hydraulic cylinder; 15. a hydraulic head; 16. a second liquid outlet pipe; 17. a sampling hole; 71. a rotor; 72. a stator; 73. a drive shaft; 74. a drive plate; 75. a control valve; 91. sampling a bin; 92. a closing disk; 93. sealing the pressure maintaining mechanism; 931. a bidirectional flow limiting head; 932. a first spring; 933. a second spring; 934. a slip ring; 935. a third spring; 9311. a first interception net; 9312. a second interception net; 9313. a conical groove; 9314; a sealing plate; 9315. a fourth spring; 921. a tray body; 922. a through groove; 923. and sealing the disc.
Detailed Description
Referring to fig. 1 to 5, the present invention provides a fixed point pressure maintaining sampling device for determining gas content in an underground coal seam of a coal mine, comprising:
the flexible drill rod is driven by an external driving system to carry out power transmission;
the connecting sleeve 5 is connected to the tail part of the flexible drill rod;
the water driving mechanism 7 is arranged in the connecting sleeve 5, the water driving mechanism 7 is provided with an output end capable of rotating around the central axis of the water driving mechanism so as to drive the drill bit sleeve 8 to rotate, one end of the drill bit sleeve 8 is provided with a drill bit 10, at least two drill bit holes 11 are penetrated in the drill bit 10, and after the drill bit is used for drilling to a specified position, a coal sample can be collected through the drill bit holes 11; and
the sampling mechanism 9, the sampling mechanism 9 includes sample storehouse 91 and airtight pressurize mechanism 93 at least, wherein, sample storehouse 91 is fixed in the drill bit cover 8 for collect the coal sample from in the drill bit hole 11, sealed pressurize mechanism 93 can seal the periphery of sampling storehouse 91.
That is to say, this embodiment, combine together drilling equipment and sampling device, realize the fixed point sample at the in-process that creeps into, so can save the step of changing the equipment to raise the efficiency, and the direct sample after creeping into can improve the sampling precision, simultaneously, accomplish the in-process that the drilling rod withdraws at the sample and realized airtight pressurize, be favorable to the accurate survey to coal seam gas content.
In this embodiment, as shown in fig. 2 and 3, the sealing and pressure maintaining mechanism 93 includes a bidirectional flow limiting head 931, and the bidirectional flow limiting head 931 is connected to the drill 10 by a plurality of first springs 932 and blocks the drill hole 11;
bidirectional flow limiting head 931 is still connected with slip ring 934 by adopting a second spring, slip ring 934 is limited to slide in the inner wall of drill bit sleeve 8, a plurality of sampling holes 17 used for auxiliary sampling are arranged in the circumferential array on drill bit sleeve 8, and in the initial stage, sampling holes 17 can be plugged by slip ring 934.
In addition, the slip ring 934 is connected to the inner wall of the bit housing 8 by a third spring 935.
Further, as shown in fig. 4, the bidirectional flow limiting head 931 includes a first interception net 9311 and a second interception net 9312 which are symmetrically arranged and are used for intercepting the coal, a tapered groove 9313 is fixed between the first interception net 9311 and the second interception net 9312, an opening of the tapered groove 9313 facing one side of the drill hole 11 direction is larger than an opening of the other side, a sealing plate 9314 is further slidably arranged in the tapered groove 9313, and the sealing plate 9314 is connected with the second interception net 9312 by a fourth spring.
When the drill bit takes a sample, the flushing liquid stops flowing to the direction of the drill bit hole at the moment, part of the coal sample moves towards the drill bit hole under the action of the bit pressure and pushes the second interception net 9312 to be separated from the drill bit hole, so that the coal sample enters the drill bit sleeve 8, the sliding ring is pushed along with the coal sample, and part of the coal sample enters the drill bit sleeve 8 from the sampling hole 17, so that the quick sampling is realized, and the coal sample can be collected again by the sampling bin after being sampled.
In this embodiment, as shown in fig. 2, the water driving mechanism 7 includes a rotor 71 rotatably disposed in a stator 72 disposed in the inner wall of the connecting sleeve 5 and capable of driving the rotor to rotate when the flushing liquid flows through the gap between the rotor and the stator;
the output end of the rotor 71 is hinged to the transmission shaft 73 in a universal mode, the other end of the transmission shaft 73 is fixedly provided with a transmission disc 74, the transmission disc 74 is fixedly connected with the drill bit sleeve 8 in a sealing mode, the transmission disc 74 is provided with a control valve 75, so that the flushing liquid is guided to the position of the bidirectional flow limiting head 931, the flushing liquid is sent out of the drill bit hole 11, namely, when the sample is not taken, the flushing liquid is used for pushing the sealing plate 9314 to be away from the first intercepting net 9311, the flushing liquid is sent out of the drill bit hole 11, and therefore the temperature of the drill bit can be effectively lowered.
And a second liquid outlet pipe 16 is arranged on the drill sleeve 8 in a penetrating manner, the second liquid outlet pipe 16 is positioned on one side, close to the transmission shaft 73, of the transmission disc 74, a second valve body is arranged in the second liquid outlet pipe 16, and when the sampling mechanism 9 is used for sampling, the second valve body is opened, and the control valve 75 is closed.
At this time, the flushing liquid is discharged from the position of the second liquid outlet pipe 16, so that the coal sample can enter the drill bit sleeve 8 from the drill bit hole.
In a preferred embodiment, a first liquid outlet pipe 13 is arranged on the bit sleeve 8 in a penetrating manner, the first liquid outlet pipe 13 is positioned on one side of the transmission disc 74 close to the transmission shaft 73, a first valve body is arranged in the first liquid outlet pipe 16, a hydraulic cylinder 14 is further fixed on the outer portion of the bit sleeve 8 in the radial direction, the hydraulic cylinder 14 is communicated with the first liquid outlet pipe 13, a hydraulic head 15 is slidably arranged in the hydraulic cylinder 14, and hydraulic pressure can be driven by injecting washing liquid into the hydraulic cylinder 14.
In this embodiment, as shown in fig. 5, one end of the sampling bin 91 is closed, and the other end is fixed with a closed disk 92, a plurality of through grooves 922 have been seted up on the closed disk 92, a sealing disc 923 rotates in the through grooves 922, and the sealing disc 923 has rotational power.
That is to say, in this embodiment, on the one hand, the sampling cabin can be used to realize sampling sealing pressure maintaining, and on the other hand, the sealing pressure maintaining mechanism 93 can also be used to realize sealing pressure maintaining outside the sampling cabin, thereby realizing double-layer sealing pressure maintaining.
In this embodiment, flexible drilling rod includes a plurality of articulated universal joint 1 in proper order, and is a plurality of universal joint 1 sets up in flexible cover 4, one side of flexible cover 4 forms through screw thread sunken, and the other end forms through threaded connection head 3, screw thread sunken department is provided with check valve 2, threaded connection head 3 is used for linking to each other with spread groove 6, spread groove 6 fixed embedding is in adapter sleeve 5.
In specific implementation, when a sample is not taken, the second valve body is closed, the control valve 75 is opened, the flushing liquid is guided to the position of the bidirectional flow limiting head 931, the flushing liquid pushes the sealing plate 9314 to be far away from the first interception net 9311, and the flushing liquid is sent out of the drill hole 11, so that the drill can be effectively cooled; and then
When the drill bit samples, the second valve body is opened, the control valve 75 is closed, at the moment, flushing liquid stops flowing towards the direction of the drill bit hole, part of the coal sample moves towards the drill bit hole under the action of the bit pressure and pushes the second interception net 9312 to be separated from the drill bit hole, the coal sample enters the drill bit sleeve 8, the sliding ring is pushed along with the coal sample, part of the coal sample enters the drill bit sleeve 8 from the sampling hole 17, rapid sampling is achieved, further the drilling equipment and the sampling equipment are combined, fixed-point sampling is achieved in the drilling process, the equipment replacing step can be saved, the efficiency is improved, direct sampling after drilling can improve the sampling precision, meanwhile, closed pressure maintaining is achieved in the process that the sampling is completed when the drill rod is withdrawn, and accurate determination of the gas content of a coal seam is facilitated.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (9)
1. Colliery is fixed point pressurize sampling device of coal seam gas assay in pit, its characterized in that: the method comprises the following steps:
a flexible drill rod which is power-transmitted by an external driving system;
the connecting sleeve (5) is connected to the tail part of the flexible drill rod;
the water driving mechanism (7) is arranged in the connecting sleeve (5), the water driving mechanism (7) is provided with an output end capable of rotating around the central axis of the water driving mechanism so as to drive the drill bit sleeve (8) to rotate, one end of the drill bit sleeve (8) is provided with a drill bit (10), at least two drill bit holes (11) are penetrated in the drill bit (10), and after the drill bit is used for drilling to a specified position, a coal sample is collected through the drill bit holes (11);
and the sampling mechanism (9), the sampling mechanism (9) includes sample storehouse (91) and airtight pressurize mechanism (93) at least, wherein, sample storehouse (91) is fixed in drill bit cover (8) for collect the coal sample from in drill bit hole (11), sealed pressurize mechanism (93) can seal the periphery of sampling storehouse (91).
2. The coal mine underground coal seam gas content determination fixed-point pressure maintaining sampling device according to claim 1, characterized in that: the sealing pressure maintaining mechanism (93) comprises a bidirectional flow limiting head (931), and the bidirectional flow limiting head (931) is connected with the drill bit (10) through a plurality of first springs (932) and is plugged on the drill bit hole (11);
two-way current limiting head (931) still adopt the second spring to link to each other with sliding ring (934), sliding ring (934) are spacing to slide in the inner wall of drill bit cover (8), just a plurality of thief holes (17) that are used for supplementary sample are seted up to circumference array on drill bit cover (8), and initial stage, thief holes (17) can be blocked by sliding ring (934).
3. The coal mine underground coal seam gas content determination fixed-point pressure-maintaining sampling device according to claim 2, characterized in that: the slip ring (934) is also connected with the inner wall of the drill bit sleeve (8) by a third spring (935).
4. The coal mine underground coal seam gas content determination fixed-point pressure maintaining sampling device according to claim 2, characterized in that: two-way current limiting head (931) are including first interception net (9311) and second interception net (9312) that the symmetry set up for the interception coal cinder, be fixed with tapered slot (9313) between first interception net (9311) and second interception net (9312), tapered slot (9313) is greater than the other side opening towards the opening of drill bit hole (11) direction one side, it is provided with closing plate (9314) still to slide in tapered slot (9313), closing plate (9314) adopt the fourth spring to link to each other with second interception net (9312).
5. The coal mine underground coal seam gas content determination fixed-point pressure maintaining sampling device according to claim 4, characterized in that: the water driving mechanism (7) comprises a rotor (71) which is rotatably arranged in a stator (72), the stator is arranged in the inner wall of the connecting sleeve (5), and the rotor can be driven to rotate when flushing liquid flows through a gap between the rotor and the stator;
the output and the universal articulated of transmission shaft (73) of rotor (71), the other end of transmission shaft (73) is fixed with driving disc (74), driving disc (74) and drill bit cover (8) are sealed fixed continuous, be provided with control valve (75) on driving disc (74) to water conservancy diversion to two-way restriction head (931) position department with the flush fluid, thereby send out drill bit hole (11) with the flush fluid.
6. The coal mine underground coal seam gas content determination fixed-point pressure maintaining sampling device according to claim 5, characterized in that: the drill bit sleeve (8) is provided with a second liquid outlet pipe (16) in a penetrating mode, the second liquid outlet pipe (16) is located on one side, close to the transmission shaft (73), of the transmission disc (74), a second valve body is arranged in the second liquid outlet pipe (16), and when sampling is conducted through the sampling mechanism (9), the second valve body is opened, and the control valve (75) is closed.
7. The coal mine underground coal seam gas content determination fixed-point pressure maintaining sampling device according to claim 5, characterized in that: the drill bit sleeve is characterized in that a first liquid outlet pipe (13) is arranged on the drill bit sleeve (8) in a penetrating mode, the first liquid outlet pipe (13) is located on one side, close to a transmission shaft (73), of a transmission disc (74), a first valve body is arranged in the first liquid outlet pipe (16), a hydraulic cylinder (14) is further fixed on the outer portion of the drill bit sleeve (8) in the radial direction, the hydraulic cylinder (14) is communicated with the first liquid outlet pipe (13), and a hydraulic head (15) is arranged in the hydraulic cylinder (14) in a sliding mode.
8. The coal mine underground coal seam gas content determination fixed-point pressure maintaining sampling device according to claim 1, characterized in that: the one end in sample storehouse (91) is for sealing the form, and the other end is fixed with and seals dish (92), seal and seted up a plurality of logical grooves (922) on dish (92), it is provided with sealed disc (923) to rotate in logical groove (922), sealed disc (923) have rotation power.
9. The coal mine underground coal seam gas content determination fixed-point pressure maintaining sampling device according to claim 1, characterized in that: flexible drilling rod includes a plurality of articulated universal joint (1) in proper order, and is a plurality of universal joint (1) sets up in flexible cover (4), one side of flexible cover (4) forms through screw thread sunken, and the other end forms through threaded connection head (3), screw thread sunken department is provided with check valve (2), threaded connection head (3) are used for linking to each other with spread groove (6), spread groove (6) fixed embedding is in adapter sleeve (5).
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| CN202210271003.3A CN114659828B (en) | 2022-03-18 | 2022-03-18 | Fixed point pressure maintaining sampling device for coal mine underground coal seam gas content determination |
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| Publication number | Publication date |
|---|---|
| CN114659828B (en) | 2022-12-20 |
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