CN111097236B - Filtering device and filtering method for ground gas measurement sampling in mineral exploration - Google Patents
Filtering device and filtering method for ground gas measurement sampling in mineral exploration Download PDFInfo
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- CN111097236B CN111097236B CN201911407117.0A CN201911407117A CN111097236B CN 111097236 B CN111097236 B CN 111097236B CN 201911407117 A CN201911407117 A CN 201911407117A CN 111097236 B CN111097236 B CN 111097236B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
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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
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
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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
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
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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
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2294—Sampling soil gases or the like
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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
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
Abstract
The invention belongs to the technical field of mineral exploration, and particularly relates to a filtering device and a filtering method for measuring and sampling ground gas in mineral exploration. The device provided by the invention is simple and convenient to carry, is convenient to install and disassemble, and can effectively filter large-particle soil particles and moisture in the extracted airflow; the common fault that the trace element content of a plurality of point position samples after an abnormal point position is too high caused by accidental errors can be effectively reduced; after every sampling point is accomplished, three spare part all can be alone through the soil particle among them of vibrations separation, can effectively avoid the inhomogeneous problem of the too big different positions air suction dynamics that leads to of soil moisture.
Description
Technical Field
The invention belongs to the technical field of mineral exploration, and particularly relates to a filtering device and a filtering method for measuring and sampling ground gas in mineral exploration.
Background
The geogas measuring method is a classic penetrating geochemical exploration method, is subjected to research tests of a plurality of students for many years, is mature gradually, and can play an important role in exploring blind minerals. The earth gas method comprises an active air extraction method and a passive adsorption method, wherein the active air extraction method has the advantage of rapid sampling, and the trapping medium comprises polyurethane plastic and an ultra-pure solution. In the field work of the active air extraction method, a sampling hole of about 0.7m is drilled on a soil covering layer by a steel chisel and is respectively connected with a spiral sampling drill, a filter, a trapping medium and an air extraction device to extract a ground gas sample. During sampling of the ground gas, the trapping medium is subjected to ultra-pure treatment. Therefore, ensuring the consistency of the sampling conditions is of great significance to the results. The filter has the biggest influence on the sampling link compared with other devices. In operation, a glass fiber microporous membrane is generally used as the main filtration device, and the pore size of the membrane is 1 μm, which can prevent coarse-grained soil from entering the collection medium. However, it was found that the microfiltration membrane achieved filtration during sampling, but there was some incidental error. The reasons are mainly three points: the microporous filter membrane can not be replaced at each point position under field conditions, and in continuous multi-point work, because the microporous filter membrane has certain thickness, partial particles with the particle diameters similar to or smaller than the pore diameters of the microporous filter membrane stay on the microporous filter membrane, so that certain influence can be exerted on the measurement result of subsequent point positions.
Therefore, it is desirable to provide a filtering apparatus and a filtering method for sampling and measuring the ground gas in mineral exploration, which avoid accidental errors and solve the deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a filtering device for sampling by an active air extraction method for ground gas measurement in mineral exploration, which is simple and convenient to use and operate, does not need to replace a microporous filtering membrane at each point position, and ensures the consistency in sampling work under the maximum condition.
The technical scheme for realizing the purpose of the invention is as follows:
a filter device for measuring and sampling ground gas in mineral exploration comprises a filter air inlet, a first stainless steel mesh, anhydrous calcium sulfate particles, a polyurethane filter screen, a second stainless steel mesh, an air outlet bin, an air inlet bin, a first sealant rubber ring, a sealed water filling opening, a water filtering bin and a second sealant rubber ring, wherein the filter air inlet and the air inlet bin are integrally formed by plastic; the water-tight filtering filling port is connected with the water filtering bin by threads, anhydrous calcium sulfate particles are filled in the water filtering bin, and the polyurethane filter screen is fixedly connected with the water filtering bin; the air outlet bin is fixedly connected with the air outlet, the stainless steel mesh II is fixedly connected with the air outlet, and a circle of concave ring is arranged in the inner wall of the air outlet bin and used for placing an elastic sealing rubber ring II.
The filter air inlet, the stainless steel mesh I, the air inlet bin and the sealant leather ring I form a primary filtering device.
The anhydrous calcium sulfate particles, the polyurethane filter screen, the dense water filtering filling opening and the water filtering bin form a water and gas removing device.
The stainless steel mesh II, the gas outlet bin, the gas outlet and the sealant leather ring II form a micron-sized filtering device.
The air inlet of the filter is used for being connected with a rubber air pipe of the spiral sampler.
The inner wall of the air inlet bin is bonded with the stainless steel mesh through strong glue.
The air outlet bin and the air outlet are integrally formed and are connected with a rubber tube connected with a rear trapping medium.
The aperture of the stainless steel mesh II is 2.6 mu m.
A method for measuring, sampling and filtering ground gas in mineral exploration specifically comprises the following steps:
before sampling a ground gas sample, removing dust on the surfaces and in the primary filtering device and the micron filtering device, and sequentially connecting the primary filtering device, the moisture removing device and the micron filtering device;
step (2) when sampling the ground gas at a sampling point, removing soil particles on the surfaces of the primary filtering device, the moisture removing device and the micron filtering device, and then sequentially assembling the three parts for air extraction and filtering;
and (3) after sampling the ground gas at the sampling point, removing soil particles on the surfaces of the primary filtering device, the moisture removing device and the micron filtering device, and placing the soil particles in a closed container with less dust.
The step (1) specifically comprises the following steps:
step (1.1), filling brand-new or dried anhydrous calcium sulfate particles into a water filtering bin, and screwing a water filtering filling opening onto the water filtering bin;
and (1.2) vibrating and knocking to remove dust on the surfaces and in the inner parts of the primary filtering device and the micron filtering device, and sequentially connecting the primary filtering device, the moisture removing device and the micron filtering device.
The step (2) specifically comprises the following steps:
step (2.1), the primary filtering device, the moisture removing device and the micron filtering device are slightly knocked and impacted by hard objects such as steel rods, iron hammers and the like respectively to remove soil particles staying on the surfaces of the first stainless steel mesh, the anhydrous calcium sulfate particles and the second stainless steel mesh;
sequentially connecting the three parts according to a primary filtering device, a moisture removing device and a micron-sized filtering device to form a complete filtering device;
step (2.3) connecting one side of an air inlet of the filter with a rubber tube of the spiral sampler, and connecting an air outlet with a foam plastic sampler filled with a trapping medium or a rubber tube at one side of a U-shaped bottle for air extraction;
and (2.4) disassembling the filter before sampling at the next point, knocking and vibrating the primary filtering device, the moisture removing device and the micron-sized filtering device respectively to reduce the quantity of soil particles in the primary filtering device, and then sequentially connecting the primary filtering device, the moisture removing device and the micron-sized filtering device to sample at the next point.
In the step (3), in the sampling process of the soil humid area, the color of the anhydrous calcium sulfate particles in the moisture removal device should be closely paid attention, and if more than half of the color is changed into light red, the anhydrous calcium sulfate particles should be replaced in time.
The invention has the beneficial technical effects that:
(1) the method can effectively reduce the common disease of the excessive content of trace elements in the samples at a plurality of point positions behind the abnormal point position caused by accidental errors;
(2) the invention has convenient assembly and disassembly, and after each sampling point is finished, three parts can separate soil particles independently by vibration, thereby effectively avoiding the problem of nonuniform air suction force of different points caused by overlarge soil moisture.
(3) The invention is simple and portable, and convenient to install and disassemble, and is mainly connected with the spiral sampling drill rubber tube through the air inlet hole and the air outlet hole is connected with the foam plastic sampler or the U-shaped bottle filled with solution, so that the invention plays a role of filtering in the air exhaust process and can effectively filter large soil particles and moisture in the air exhaust flow. After the work of bleeding of a sample point location is accomplished, can dismantle through simple pulling and inserting and strike vibrations through hard things such as with drill rod, hammer, effectively separate the soil particle of stagnation wherein or screen cloth surface, the uniformity in the assurance field work that can furthest.
Drawings
FIG. 1 is a schematic structural diagram of a filtering apparatus for sampling by active pumping method for geogas measurement in mineral exploration according to the present invention;
in the figure: 1-filter inlet; 2-stainless steel net I; 3-anhydrous calcium sulfate particles; 4-a polyurethane screen; 5-stainless steel net II; 6-gas outlet bin; 7-air outlet; 8-an air inlet bin; 9-sealing rubber ring I; 10-water filtration filling port; 11-a water filtering bin; 12-sealing rubber ring II
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The invention provides a filtering device for sampling by an active air extraction method for measuring ground gas in mineral exploration, which comprises a filter air inlet 1, a first stainless steel net 2, anhydrous calcium sulfate particles 3, a polyurethane filter screen 4, a second stainless steel net 5, an air outlet bin 6, an air outlet 7, an air inlet bin 8, a first sealant leather collar 9, a water filtering filling opening 10, a water filtering bin 11 and a second sealant leather collar 12.
The filter air inlet 1 and the air inlet bin 8 are integrally formed by plastic, the stainless steel mesh I2 and the inner wall of the air inlet bin 8 are fixed by strong glue, and a circle of concave ring is arranged in the inner wall of the air inlet bin 8 and used for placing an elastic sealing rubber ring I9; the water filtering filling port 10 and the water filtering bin 11 are connected in a threaded screwing mode, anhydrous calcium sulfate particles 3 are filled in the inner bin 11 and can be replaced by opening the water filtering filling port 10, and the polyurethane filter screen 4 is fixedly connected with a necking part of the inner bin of the water filtering bin 11 by using super glue; the air outlet bin 6 and the air outlet 7 are also integrally formed plastic pieces, the stainless steel mesh II 5 and the inner bin of the air outlet 7 are fixed by strong glue, and a circle of concave ring is arranged in the inner wall of the air outlet bin 6 and used for placing a second elastic sealing rubber ring 12.
As shown in figure 1, the invention mainly comprises three parts, the first part is a primary filtering device which comprises a filter air inlet 1, a stainless steel mesh I2, an air inlet bin 8 and a sealant leather ring I9, the primary filtering device is used for blocking large-particle soil in the air exhaust process, the primary filtering device has the primary filtering function, the air inlet 1 is used for being connected with a rubber air pipe of a spiral sampler, air is primarily filtered in the stainless steel mesh I2, the inner wall of the air inlet bin 8 is bonded with the stainless steel mesh I2 through strong glue, the stainless steel mesh I2 is ensured to be closed, the air cannot detour, the sealant leather ring I9 has the function of connecting the first part and the second part, the elasticity is realized, the tightness of the connecting part is ensured, and metal element pollution cannot be caused in the air exhaust process. The second part is the moisture removal device, including anhydrous calcium sulfate granule 3, polyurethane filter screen 4, drainage fill mouth 10 and drainage storehouse 11, anhydrous calcium sulfate granule 3 wherein, can be effectual to taking out ground gas dry, calcium sulfate relatively with the silica gel granule, attract in the soil to receive the microparticle ability relatively poor, can not hinder its passing through in a large number. The polyurethane filter screen 4 is positioned behind the drying agent and plays a role in air mixing and drying agent isolation. The water filtering filling opening 10 is positioned in the front of the drying agent and is a filling opening of the drying bin, and the functions of air inlet, drying agent isolation and drying agent filling at the opening are achieved. The third part is a micron-sized filtering device which comprises a second stainless steel mesh 5, an air outlet bin 6, an air outlet 7 and a second sealing rubber ring 12, wherein the aperture of the second stainless steel mesh 5 is 2.6 mu m, and in the air extraction process of the ground gas, the micron-sized particles, the nanometer-sized particles and the like are filtered again in the later stage to remove the particles with slightly larger particle size. The second sealing rubber ring 12 has the same function as the first sealing rubber ring 9. The gas outlet bin 6 and the gas outlet 7 are integrally formed and are connected with a rubber hose connected with a rear trapping medium under the condition of ensuring the sealing. When the three major parts are connected or disconnected, the three major parts are only needed to be pressed and pushed forcefully or pulled out slowly and forcefully.
The invention also provides a sampling and filtering method for the ground gas measurement active air extraction method in mineral exploration, which specifically comprises the following steps:
and (1) removing dust on the surfaces and in the primary filtering device and the micron filtering device before sampling the ground gas sample, and sequentially connecting the primary filtering device, the moisture removing device and the micron filtering device.
Step (1.1) before sampling the ground gas sample, filling brand-new or dried anhydrous calcium sulfate particles 3 into a water filtering bin 11, and screwing a water filtering filling opening 10 onto the water filtering bin 11.
And (1.2) removing dust on the surfaces and in the primary filtering device and the micron filtering device by vibrating and knocking, and sequentially connecting the primary filtering device, the moisture removing device and the micron filtering device.
And (2) when sampling the ground gas at the sampling point, removing soil particles on the surfaces of the primary filtering device, the water and gas removing device and the micron filtering device, and then sequentially assembling the three parts for air extraction and filtering.
And (2.1) sampling the ground gas at a sampling point, slightly knocking and impacting the primary filtering device, the moisture removing device and the micron filtering device by hard objects such as steel rods, iron hammers and the like respectively, and removing soil particles staying on the surfaces of the first stainless steel mesh 2, the anhydrous calcium sulfate particles 3 and the second stainless steel mesh 5 in a vibration mode.
And (2.2) sequentially connecting the three parts according to the sequence of the primary filtering device, the moisture removing device and the micron-sized filtering device to form a complete filtering device, and replacing threads with the sealing rubber ring 9 and the sealing rubber ring 12, so that the installation efficiency is high.
And (2.3) after the spiral sampler is punched and connected, connecting one side of the air inlet 1 of the filter with a rubber tube of the spiral sampler, connecting the air outlet 7 with a rubber tube on one side of a foam plastic sampler or a U-shaped bottle filled with a trapping medium, and exhausting after connecting an exhaust cylinder or an atmospheric sampler.
And (2.4) disassembling the filter between sampling intervals of each point location, knocking and vibrating the primary filtering device, the moisture removing device and the micron-sized filtering device respectively to reduce the number of soil particles in the primary filtering device, so as to reduce the accidental error in the ground gas measurement sampling to the minimum, and sequentially connecting the primary filtering device, the moisture removing device and the micron-sized filtering device to perform sampling work of the next point location.
And (3) after sampling the ground gas at the sampling point, removing soil particles on the surfaces of the primary filtering device, the moisture removing device and the micron filtering device, and placing the soil particles in a closed container with less dust.
After the field work of one day is finished, the primary filtering device, the moisture removing device and the micron-sized filtering device are separated and sufficiently vibrated, and then the primary filtering device, the moisture removing device and the micron-sized filtering device are placed in a closed container with less dust for the sampling work of the next day. In the sampling process of the soil humid area, besides the above operation steps, the color of the anhydrous calcium sulfate particles 3 in the moisture removal device should be closely paid attention, and if more than half of the color is changed into light red, the anhydrous calcium sulfate particles should be replaced in time.
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.
Claims (9)
1. A filter equipment that is arranged in mineral exploration ground gas to measure sample which characterized in that: the device comprises a filter air inlet (1), an 800-mesh stainless steel mesh (2), anhydrous calcium sulfate particles (3), a 1mm polyurethane filter screen (4), a 5000-mesh stainless steel mesh (5), an air outlet bin (6), an air outlet (7), an air inlet bin (8), a first sealant rubber ring (9), a water filtering filling opening (10), a water filtering bin (11) and a second sealant rubber ring (12), wherein the filter air inlet (1) and the air inlet bin (8) are integrally formed by plastic, the 800-mesh stainless steel mesh (2) is fixedly connected with the inner wall of the air inlet bin (8), and a circle of concave ring is arranged in the inner wall of the air inlet bin (8) and used for placing the first sealant rubber ring (9) with elasticity; the water filtering filling port (10) is connected with the water filtering bin (11) by threads, anhydrous calcium sulfate particles (3) are filled in the inner bin of the water filtering bin (11), and a 1mm polyurethane filter screen (4) is fixedly connected with the inner bin of the water filtering bin (11); the air outlet bin (6) is fixedly connected with the air outlet (7), the 5000-mesh stainless steel net (5) is fixedly connected with the air outlet (7), and a circle of concave ring is arranged in the inner wall of the air outlet bin (6) and used for placing a second elastic sealing rubber ring (12);
the filter air inlet (1), the 800-mesh stainless steel net (2), the air inlet bin (8) and the sealant leather ring I (9) form a primary filtering device;
the anhydrous calcium sulfate particles (3), the 1mm polyurethane filter screen (4), the water filtering filling opening (10) and the water filtering bin (11) form a water and gas removing device;
the 5000-mesh stainless steel net (5), the air outlet bin (6), the air outlet (7) and the sealant leather ring II (12) form a micron-sized filtering device.
2. A filter device for sampling of earth gas in mineral exploration, according to claim 1, characterized in that: the filter air inlet (1) is used for being connected with a rubber air pipe of the spiral sampler.
3. A filter device for sampling of earth gas in mineral exploration, according to claim 2, characterized in that: the inner wall of the air inlet bin (8) is bonded with the 800-mesh stainless steel net (2) through strong glue.
4. A filter device for sampling of earth gas in mineral exploration, according to claim 3, characterized in that: the air outlet bin (6) and the air outlet (7) are integrally formed and are connected with a rubber tube connected with a rear trapping medium.
5. A filter device for sampling of ground gas measurements in mineral exploration, according to claim 4, characterized in that: the aperture of the 5000-mesh stainless steel net (5) is 2.6 mu m.
6. A method for filtering a ground gas measurement sample in a mineral exploration, which employs the filtering device for the ground gas measurement sample in the mineral exploration according to any one of claims 1 to 5, the method comprising the following steps:
before sampling a ground gas sample, removing dust on the surfaces and in the primary filtering device and the micron filtering device, and sequentially connecting the primary filtering device, the moisture removing device and the micron filtering device;
step (2) when sampling the ground gas at a sampling point, removing soil particles on the surfaces of the primary filtering device, the moisture removing device and the micron filtering device, and then sequentially assembling the three parts for air extraction and filtering;
and (3) after sampling the ground gas at the sampling point, removing soil particles on the surfaces of the primary filtering device, the moisture removing device and the micron filtering device, and placing the soil particles in a closed container with less dust.
7. The method as claimed in claim 6, wherein the sampling and filtering method for measuring the earth's gas in mineral exploration is as follows: the step (1) specifically comprises the following steps:
step (1.1), filling brand-new or dried anhydrous calcium sulfate particles (3) into a water filtering bin (11), and screwing a water filtering filling opening (10) onto the water filtering bin (11);
and (1.2) vibrating and knocking to remove dust on the surfaces and in the inner parts of the primary filtering device and the micron filtering device, and sequentially connecting the primary filtering device, the moisture removing device and the micron filtering device.
8. The method as claimed in claim 7, wherein the sampling and filtering method for measuring the earth's gas in mineral exploration is as follows: the step (2) specifically comprises the following steps:
step (2.1) the primary filtering device, the moisture removing device and the micron filtering device are slightly knocked and impacted by steel chisel and hammer respectively to remove soil particles staying on the surfaces of the 800-mesh stainless steel net (2), the anhydrous calcium sulfate particles (3) and the 5000-mesh stainless steel net (5);
sequentially connecting the three parts according to a primary filtering device, a moisture removing device and a micron-sized filtering device to form a complete filtering device;
step (2.3) connecting one side of the air inlet (1) of the filter with a rubber tube of a spiral sampler, and connecting an air outlet (7) with a rubber tube at one side of a foam plastic sampler or a U-shaped bottle filled with a trapping medium for air extraction;
and (2.4) disassembling the filter before sampling at the next point, knocking and vibrating the primary filtering device, the moisture removing device and the micron-sized filtering device respectively to reduce the quantity of soil particles in the primary filtering device, and then sequentially connecting the primary filtering device, the moisture removing device and the micron-sized filtering device to sample at the next point.
9. The method as claimed in claim 8, wherein the sampling and filtering method for measuring the earth's gas in mineral exploration is as follows: in the step (3), in the sampling process of the soil humid area, the color of the anhydrous calcium sulfate particles (3) in the moisture removal device should be closely paid attention, and if more than half of the color is changed into light red, the anhydrous calcium sulfate particles should be replaced in time.
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| RU2394220C2 (en) * | 2008-08-25 | 2010-07-10 | Учреждение Российской академии наук Центр геофизических исследований Владикавказского научного центра РАН и Правительства Республики Северная Осетия-Алания (ЦГИ ВНЦ РАН и РСО-А) | Device for collecting gas samples from soil |
| CN203299032U (en) * | 2013-04-27 | 2013-11-20 | 山东农业大学 | Simple device for collecting soil gas in large field by adopting dynamic balance method |
| CN104713276A (en) * | 2013-12-12 | 2015-06-17 | 常州西玛特电器有限公司 | Drying filter |
| CN206660905U (en) * | 2017-03-30 | 2017-11-24 | 雷小利 | A kind of atmospheric sampling buffers drying tube |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2394220C2 (en) * | 2008-08-25 | 2010-07-10 | Учреждение Российской академии наук Центр геофизических исследований Владикавказского научного центра РАН и Правительства Республики Северная Осетия-Алания (ЦГИ ВНЦ РАН и РСО-А) | Device for collecting gas samples from soil |
| CN203299032U (en) * | 2013-04-27 | 2013-11-20 | 山东农业大学 | Simple device for collecting soil gas in large field by adopting dynamic balance method |
| CN104713276A (en) * | 2013-12-12 | 2015-06-17 | 常州西玛特电器有限公司 | Drying filter |
| CN206660905U (en) * | 2017-03-30 | 2017-11-24 | 雷小利 | A kind of atmospheric sampling buffers drying tube |
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