CN115453060A - Gas detection appearance device is used in portable geological survey - Google Patents
Gas detection appearance device is used in portable geological survey Download PDFInfo
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- CN115453060A CN115453060A CN202211113223.XA CN202211113223A CN115453060A CN 115453060 A CN115453060 A CN 115453060A CN 202211113223 A CN202211113223 A CN 202211113223A CN 115453060 A CN115453060 A CN 115453060A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
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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
- G01N1/24—Suction devices
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The invention discloses a portable gas detector device for geological exploration, which comprises a disc and two supports which are integrally fixed on the surface of the disc and symmetrically distributed, wherein a detector body for detecting gas and a driving assembly for driving the detector body to move along the vertical direction are arranged below the disc. According to the invention, the driving assembly is arranged, so that the detector body can be driven to move downwards into the rock cavern, and the air in the rock cavern can be detected; the air transmission assembly is arranged so that air can be transmitted into the detector body when the detector body moves downwards, the detector body can detect air at different depths all the time, and the detection efficiency of the device is effectively improved; through setting up the linkage subassembly to drive detector body and three-way pipe along horizontal direction reciprocating motion, thereby can enlarge the sampling range to the air in the cavern, can effectively improve the accuracy of testing data.
Description
Technical Field
The invention relates to the technical field of geological exploration, in particular to a portable gas detector device for geological exploration.
Background
The geological exploration can be understood as geological work in a broad sense, and is the investigation and research work on geological conditions such as rocks, stratum structures, mineral products, underground water, landforms and the like in a certain area by applying geological exploration methods such as mapping, geophysical exploration, geochemical prospecting, drilling, pit exploration, sampling test, geological remote sensing and the like according to the needs of economic construction, national defense construction and scientific and technical development.
The gas detector is an instrument and meter tool for detecting gas leakage concentration, which comprises: portable gas detectors, hand-held gas detectors, stationary gas detectors, online gas detectors, and the like. Gas sensors are used to detect the types of gases present in the environment, gas sensors are sensors used to detect the composition and content of gases.
At present, the volume of the existing gas detector is small, the gas detector is often held by a worker to detect a gas sample, but in the actual geological exploration process, when air in a rock cavern needs to be detected, the operation is difficult, and the detection is carried out by means of external force or the worker needs to enter the rock cavern.
Therefore, a portable gas detector device for geological exploration is provided to solve the above problems.
Disclosure of Invention
The invention aims to provide a portable gas detector device for geological exploration, wherein a disc is placed above a cave opening of a rock cavern, two brackets are arranged on the edge of the cave opening, and a driving assembly is arranged, so that a detector body is driven to move downwards to the interior of the rock cavern, and the air in the rock cavern is detected; through setting up gas transmission subassembly to in this internal gas transmission of detector when detector body moves down, make the detector body can detect the air of the different degree of depth always, the effectual detection efficiency who improves the device has solved when needs detect the air in the rock cavern, and it is just comparatively difficult to operate, need with the help of external force, perhaps need the staff to get into the problem that detects in the rock cavern.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a portable for geological survey gas detection appearance device, includes the disc to and the integration is fixed in disc surface and two supports of symmetric distribution, the disc below is provided with the detector body that is used for detecting gas to and be used for driving the drive assembly that the detector body removed along vertical direction.
Preferably, drive assembly is including running through in the disc centre of a circle department and with the disc rotation threaded rod of being connected, the threaded rod is driven by external drive equipment, and surperficial threaded connection has the backup pad, disc lower surface vertical fixation has and is parallel to each other with the threaded rod and runs through the gag lever post in the backup pad, horizontal spacing sliding connection of detector body is in the backup pad surface.
Preferably, the disc top is provided with the gas transmission subassembly of the internal gas transmission of past detector when the detector body moves down, the gas transmission subassembly is including the annular slab that is located the disc upper surface, disc upper surface integration is fixed with the annular frame, the annular channel with the annular frame adaptation is seted up to the annular slab lower surface, the fixed surface is connected with two symmetric distribution's on the annular slab riser, two sliding connection has the sliding block between the riser, the sliding block surface is seted up the bar groove that supplies the threaded rod to pass, and the equal vertical fixation in sliding block both ends has the stand, the cam that is located between two stands has been cup jointed on the threaded rod top.
Preferably, the gas transmission assembly further comprises a three-way pipe fixed on the surface of the detector body, a first check valve is installed at one end, close to the detector body, of the three-way pipe, a second check valve is installed at one end, far away from the detector body, of the three-way pipe, an L-shaped plate is fixedly connected to the edge of the disc, a pipeline is connected to one end of the L-shaped plate in an inserted mode, a piston rod is fixedly connected to the surface of the sliding block, a piston plate capable of sliding in the pipeline is fixedly connected to one end of the piston rod, and a hose is fixedly installed between the pipeline and the three-way pipe.
Preferably, an air outlet pipe is fixedly installed on one side, away from the three-way pipe, of the detector body, and a one-way air outlet valve is installed at one end of the air outlet pipe.
Preferably, a linkage assembly which drives the detector body and the three-way pipe to reciprocate along the horizontal direction to expand the sampling range is arranged above the disc.
Preferably, the linkage assembly comprises vertical rods which are respectively and vertically fixed on the upper surfaces of the two supports, the upper ends of the vertical rods are respectively and telescopically inserted with a cross rod, a U-shaped frame is fixedly connected between the cross rods, and one of the vertical columns is slidably connected in the U-shaped frame.
Preferably, one of the cross rods is fixedly connected with two L rods on the surface, and the detector body is fixedly connected with a push rod extending between the two L rods on the surface.
Compared with the prior art, the invention has the following beneficial effects:
1. put the disc in the entrance to a cave top of cave, two support frames are on the edge of entrance to a cave through setting up drive assembly to inside the drive detector body moves down to the cave, carry out detection work to the air in the cave.
2. Through setting up gas transmission subassembly to in this internal gas transmission of detector when the detector body moves down, make the detector body can detect the air of the different degree of depth all the time, the effectual detection efficiency who improves the device.
3. Through setting up the linkage subassembly to drive detector body and three-way pipe along horizontal direction reciprocating motion, thereby can enlarge the sampling scope to air in the cave, can effectively improve the accuracy of testing data.
4. The inclination of riser is different, can lead to the change of horizontal pole and U-shaped frame mobility range to the mobility range that makes the detector body also changes thereupon, and the staff can promote the annular plate rotation through L shaped plate piece, makes the riser along with the annular plate rotation to predetermineeing the angle, changes the horizontal migration scope of detector body, adapts to the particular case in the cavern.
Drawings
FIG. 1 is a schematic structural diagram of a portable gas detector apparatus for geological exploration, according to the present invention;
FIG. 2 is a first schematic view of the gas delivery assembly of the present invention;
FIG. 3 is a second schematic view of the gas delivery assembly of the present invention;
FIG. 4 is a schematic view of the construction of the annular groove of the present invention;
FIG. 5 is a schematic view of a linkage assembly according to the present invention;
FIG. 6 is a schematic view showing a structure of the ring plate after rotating in the present invention.
In the figure: 1. a disc; 11. an annular frame; 2. a support; 3. a detector body; 4. a drive assembly; 41. a threaded rod; 42. a support plate; 43. a limiting rod; 5. a gas delivery assembly; 51. an annular plate; 511. an annular groove; 52. a vertical plate; 53. a slider; 54. a strip-shaped groove; 55. a column; 56. a cam; 571. a three-way pipe; 572. a one-way valve I; 573. a second one-way valve; 574. an L-shaped plate; 575. a pipeline; 576. a piston rod; 577. a piston plate; 578. an air outlet pipe; 579. a one-way air outlet valve; 6. a linkage assembly; 61. a vertical rod; 62. a cross bar; 63. a U-shaped frame; 64. an L-bar; 65. a push rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, the present invention provides a technical solution: the utility model provides a portable for geological survey gas detection appearance device, includes disc 1 to and the integration is fixed in disc 1 surface and two supports 2 of symmetric distribution, disc 1 below is provided with the detector body 3 that is used for detecting gaseous, and is used for driving drive assembly 4 that detector body 3 removed along vertical direction.
In use, put disc 1 in the entrance to a cave top of cavern, two supports 2 are put on the edge of entrance to a cave, through setting up drive assembly 4 to inside the drive detector body 3 moves down to the cavern, detect the work to the air in the cavern.
Drive assembly 4 is including running through in 1 centre of a circle department of disc and with disc 1 rotation connection's threaded rod 41, threaded rod 41 is driven by external drive equipment, and surperficial threaded connection has backup pad 42, disc 1 lower surface vertical fixation has and is parallel to each other with threaded rod 41 and runs through in backup pad 42's gag lever post 43, horizontal spacing sliding connection in backup pad 42 surface of detector body 3.
The external driving device is a motor.
In use, start external drive equipment and drive threaded rod 41 rotatory, threaded rod 41 can drive threaded connection in its surperficial backup pad 42 downstream, because gag lever post 43 runs through in backup pad 42, then backup pad 42 can not be rotatory along with threaded rod 41's rotation, and backup pad 42 can slide down along gag lever post 43 simultaneously, and backup pad 42 can drive detector body 3 inside the following downstream to the cavern to subsequent detection work.
Example two
Referring to fig. 2-4, in this embodiment, for further explanation of the first embodiment, an air transportation assembly 5 for transporting air into the detector body 3 when the detector body 3 moves downward is disposed above the disc 1.
In use, through setting up gas transmission subassembly 5 to in detector body 3 internal gas transmission when 3 downstream of detector, make detector body 3 can detect the air of the different degree of depth all the time, the effectual detection efficiency who improves the device.
The gas transmission assembly 5 comprises an annular plate 51 positioned on the upper surface of the disc 1, the annular frame 11 is integrally fixed on the upper surface of the disc 1, an annular groove 511 matched with the annular frame 11 is formed in the lower surface of the annular plate 51, two vertical plates 52 and two sliding blocks 53 are fixedly connected to the upper surface of the annular plate 51 and are connected between the vertical plates 52 in a sliding manner, a strip-shaped groove 54 for the threaded rod 41 to penetrate is formed in the surface of each sliding block 53, the two ends of each sliding block 53 are vertically fixed with upright columns 55, and cams 56 positioned between the two upright columns 55 are sleeved on the top ends of the threaded rods 41.
In use, when the threaded rod 41 rotates, the cam 56 sleeved on the top end thereof can rotate, and since the cam 56 is located between the two upright posts 55, the cam 56 pushes the two upright posts 55 when rotating, and the two upright posts 55 drive the sliding block 53 to reciprocate between the two upright plates 52.
The gas transmission assembly 5 further comprises a three-way pipe 571 fixed on the surface of the detector body 3, one end of the three-way pipe 571 close to the detector body 3 is provided with a one-way valve 572, one end of the three-way pipe 571 far away from the detector body 3 is provided with a two-way valve 573, the edge of the disc 1 is fixedly connected with an L-shaped plate 574, one end of the L-shaped plate 574 is inserted with a pipeline 575, the surface of the sliding block 53 is fixedly connected with a piston rod 576, one end of the piston rod 576 is fixedly connected with a piston plate 577 capable of sliding in the pipeline 575, and a hose (not shown in the figure) is fixedly installed between the pipeline 575 and the three-way pipe 571.
In use, when the sliding block 53 moves back and forth along the two vertical plates 52, the piston rod 576 fixed on the surface thereof can be driven, and the piston plate 577 fixed at one end of the piston rod 576 moves back and forth, because the hose is fixedly installed between the pipeline 575 and the three-way pipe 571, when the piston plate 577 moves towards the side far away from the pipeline 575, air in the rock cavern can be sucked through the two check valves 573, when the piston plate 577 moves towards the side close to the pipeline 575, air in the three-way pipe 571 can be pushed into the detector body 3 through the one check valves 572, so that the detector body 3 can perform detection work conveniently.
An air outlet pipe 578 is fixedly arranged on one side of the detector body 3, which is far away from the three-way pipe 571, and one end of the air outlet pipe 578 is provided with a one-way air outlet valve 579.
In use, gas after being detected can exit through the one-way outlet valve 579.
EXAMPLE III
Referring to fig. 5-6, in this embodiment, for further explanation of the second embodiment, a linkage assembly 6 is disposed above the disc 1, and drives the detector body 3 and the tee pipe 571 to reciprocate along the horizontal direction to expand the sampling range.
In use, the linkage assembly 6 is arranged, so that the detector body 3 and the three-way pipe 571 are driven to move in a reciprocating mode along the horizontal direction, the sampling range of air in the cave can be enlarged, and the accuracy of detection data can be effectively improved.
In use, in an initial state, the vertical plate 52 and the vertical rod 61 are in a mutually perpendicular state, and when the sliding block 53 reciprocates, the U-shaped frame 63 and the cross rod 62 are still in a static state;
the L-shaped plate 574 pushes the annular plate 51 to rotate, the annular plate 51 drives the two vertical plates 52 fixed on the surface thereof and the sliding block 53 connected between the two vertical plates 52 to rotate therewith, the sliding block 53 drives the upright posts 55 fixed on the two ends thereof to rotate therewith, so that the vertical plates 52 and the sliding block 53 are inclined;
meanwhile, when the upright column 55 reciprocates along the vertical plate 52, the U-shaped frame 63 can be driven to reciprocate along the horizontal direction, the U-shaped frame 63 can drive the two cross rods 62 to reciprocate along the horizontal direction, the cross rods 62 can drive the two L-shaped rods 64 fixed on the surfaces of the cross rods 62 to reciprocate along the horizontal direction, the L-shaped rods 64 drive the push rod 65, and the detector body 3 fixed at one end of the push rod 65 reciprocates along the horizontal direction, so that the sampling range of the air in the cavern can be expanded;
the inclination angle of the vertical plate 52 is different, which results in the change of the moving range of the cross rod 62 and the U-shaped frame 63, so that the moving range of the detector body 3 is changed, and the worker can push the annular plate 51 to rotate through the L-shaped plate 574, so that the horizontal moving range of the detector body 3 is changed by rotating the vertical plate 52 to a preset angle along with the annular plate 51, and the vertical plate is adapted to the specific situation in the cave.
The working principle is as follows: when the portable gas detector device for geological exploration is used, the disc 1 is placed above a cave opening of a rock cave, the two brackets 2 are erected on the edge of the cave opening, and the threaded rod 41 and the limiting rod 43 extend into the rock cave;
starting an external driving device to drive the threaded rod 41 to rotate, wherein the threaded rod 41 can drive the supporting plate 42 in threaded connection with the surface of the threaded rod to move downwards, and the limiting rod 43 penetrates through the supporting plate 42, so that the supporting plate 42 cannot rotate along with the rotation of the threaded rod 41, meanwhile, the supporting plate 42 can slide downwards along the limiting rod 43, and the supporting plate 42 can drive the detector body 3 to move downwards to the interior of the cave, so that the subsequent detection work is facilitated;
when the threaded rod 41 rotates, the cam 56 sleeved at the top end of the threaded rod can be driven to rotate along with the threaded rod, and because the cam 56 is positioned between the two upright posts 55, the cam 56 can push the two upright posts 55 when rotating, and the two upright posts 55 drive the sliding block 53 to reciprocate between the two upright plates 52;
when the sliding block 53 moves back and forth along the two vertical plates 52, the piston rod 576 fixed on the surface of the sliding block and the piston plate 577 fixed at one end of the piston rod 576 can be driven to move back and forth, because a hose is fixedly installed between the pipeline 575 and the three-way pipe 571, when the piston plate 577 moves away from one side of the pipeline 575, air in the rock cavern can be sucked through the two check valves 573, and when the piston plate 577 moves close to one side of the pipeline 575, air in the three-way pipe 571 can be pushed into the detector body 3 through the one check valves 572, so that the detector body 3 can perform detection work conveniently;
in the initial state, the vertical plate 52 and the vertical rod 61 are in a mutually vertical state, and when the sliding block 53 reciprocates, the U-shaped frame 63 and the cross rod 62 are still in a static state;
the annular plate 51 is pushed to rotate through the L-shaped plate 574, the annular plate 51 drives the two vertical plates 52 fixed on the surface of the annular plate 51 and the sliding block 53 connected between the two vertical plates 52 to rotate along with the annular plate, and the sliding block 53 drives the upright posts 55 fixed at the two ends of the sliding block to rotate along with the upright posts, so that the vertical plates 52 and the sliding block 53 are inclined;
meanwhile, when the upright column 55 reciprocates along the vertical plate 52, the U-shaped frame 63 can be driven to reciprocate along the horizontal direction, the U-shaped frame 63 can drive the two cross rods 62 to reciprocate along the horizontal direction, the cross rods 62 can drive the two L-shaped rods 64 fixed on the surfaces of the cross rods 62 to reciprocate along the horizontal direction, the L-shaped rods 64 drive the push rod 65, and the detector body 3 fixed at one end of the push rod 65 reciprocates along the horizontal direction, so that the sampling range of the air in the cavern can be expanded;
the inclination of riser 52 is different, can lead to the change of horizontal pole 62 and U-shaped frame 63 movement range to make the movement range of detector body 3 also change thereupon, the staff can promote annular plate 51 rotatory through L shaped plate 574, makes riser 52 rotatory to predetermineeing the angle along with annular plate 51, changes the horizontal migration scope of detector body 3, adapts to the particular case in the cavern.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a gas detection appearance device for portable geological survey which characterized in that: the device comprises a disc (1) and two supports (2) which are integrally fixed on the surface of the disc (1) and symmetrically distributed, wherein a detector body (3) used for detecting gas is arranged below the disc (1), and a driving assembly (4) used for driving the detector body (3) to move along the vertical direction is arranged.
2. The gas detecting apparatus for portable geological survey according to claim 1, wherein: drive assembly (4) including running through in disc (1) centre of a circle department and with disc (1) rotation threaded rod (41) of being connected, threaded rod (41) are driven by external drive equipment, and surperficial threaded connection has backup pad (42), disc (1) lower surface vertical fixation has gag lever post (43) that are parallel to each other and run through in backup pad (42) with threaded rod (41), horizontal spacing sliding connection in backup pad (42) surface in detector body (3).
3. A gas detecting apparatus for portable geological survey according to claim 2, wherein: and a gas transmission assembly (5) for transmitting gas into the detector body (3) when the detector body (3) moves downwards is arranged above the disc (1).
4. A gas detecting apparatus for portable geological survey according to claim 3, wherein: the air delivery assembly (5) comprises an annular plate (51) located on the upper surface of the disc (1), an annular frame (11) is integrally fixed on the upper surface of the disc (1), an annular groove (511) matched with the annular frame (11) is formed in the lower surface of the annular plate (51), two vertical plates (52) which are symmetrically distributed are fixedly connected to the upper surface of the annular plate (51), a sliding block (53) is connected between the two vertical plates (52) in a sliding manner, a strip-shaped groove (54) for a threaded rod (41) to penetrate through is formed in the surface of the sliding block (53), stand columns (55) are vertically fixed to two ends of the sliding block (53), and a cam (56) located between the two stand columns (55) is sleeved at the top end of the threaded rod (41);
the gas transmission assembly (5) further comprises a three-way pipe (571) fixed on the surface of the detector body (3), a first check valve (572) is installed at one end, close to the detector body (3), of the three-way pipe (571), a second check valve (573) is installed at one end, far away from the detector body (3), of the disc (1), an L-shaped plate block (574) is fixedly connected to the edge of the disc (1), a pipeline (575) is inserted into one end of the L-shaped plate block (574), a piston rod (576) is fixedly connected to the surface of the sliding block (53), a piston plate (577) capable of sliding in the pipeline (575) is fixedly connected to one end of the piston rod (576), and a hose is fixedly installed between the pipeline (575) and the three-way pipe (571).
5. The gas detecting apparatus for portable geological survey according to claim 4, wherein: an air outlet pipe (578) is fixedly installed on one side, away from the three-way pipe (571), of the detector body (3), and a one-way air outlet valve (579) is installed at one end of the air outlet pipe (578).
6. The gas detector apparatus for geological exploration, as recited in claim 5, wherein: and a linkage assembly (6) which drives the detector body (3) and the three-way pipe (571) to reciprocate along the horizontal direction to expand the sampling range is arranged above the disc (1) while moving downwards.
7. The gas detecting apparatus for portable geological survey according to claim 6, wherein: linkage subassembly (6) are including montant (61) of difference vertical fixation in two supports (2) upper surfaces, two montant (61) upper end is all flexible the grafting has horizontal pole (62), two fixedly connected with U-shaped frame (63), one of them stand (55) sliding connection is in U-shaped frame (63).
8. The gas detector apparatus for geological exploration, as recited in claim 7, wherein: one of the cross rods (62) is fixedly connected with two L rods (64), and the surface of the detector body (3) is fixedly connected with a push rod (65) extending between the two L rods (64).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211113223.XA CN115453060B (en) | 2022-09-14 | 2022-09-14 | Portable gas detector device for geological survey |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211113223.XA CN115453060B (en) | 2022-09-14 | 2022-09-14 | Portable gas detector device for geological survey |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60028974D1 (en) * | 2000-10-10 | 2006-08-03 | Riken Keiki Co | Portable gas sensor device and associated holder |
| US20180348183A1 (en) * | 2017-05-12 | 2018-12-06 | Acrulog Pty Ltd | Portable Long Term Gas Detecting and Monitoring Apparatus |
| US20210048419A1 (en) * | 2019-08-13 | 2021-02-18 | Chengdu Sudu Geological Engineering Consulting Co., Ltd. | Tunnel toxic-and-harmful-gas deep-hole detection device and method |
| CN213544500U (en) * | 2020-09-26 | 2021-06-25 | 袁丽伟 | Portable gas detector for geological survey |
| CN214750165U (en) * | 2021-05-07 | 2021-11-16 | 张璞 | Portable gas detector for geological survey |
| CN217007200U (en) * | 2022-02-09 | 2022-07-19 | 山东省地质矿产勘查开发局第八地质大队(山东省第八地质矿产勘查院) | Portable gas detector for geological survey |
-
2022
- 2022-09-14 CN CN202211113223.XA patent/CN115453060B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60028974D1 (en) * | 2000-10-10 | 2006-08-03 | Riken Keiki Co | Portable gas sensor device and associated holder |
| US20180348183A1 (en) * | 2017-05-12 | 2018-12-06 | Acrulog Pty Ltd | Portable Long Term Gas Detecting and Monitoring Apparatus |
| US20210048419A1 (en) * | 2019-08-13 | 2021-02-18 | Chengdu Sudu Geological Engineering Consulting Co., Ltd. | Tunnel toxic-and-harmful-gas deep-hole detection device and method |
| CN213544500U (en) * | 2020-09-26 | 2021-06-25 | 袁丽伟 | Portable gas detector for geological survey |
| CN214750165U (en) * | 2021-05-07 | 2021-11-16 | 张璞 | Portable gas detector for geological survey |
| CN217007200U (en) * | 2022-02-09 | 2022-07-19 | 山东省地质矿产勘查开发局第八地质大队(山东省第八地质矿产勘查院) | Portable gas detector for geological survey |
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