Device and method for continuous sampling of mineral aerosol at a fixed depth in deep-covered areas of fluorocarbon cerium rare earth mines

Abstract

The present application relates to a device and method for continuous sampling of mineral aerosols at a fixed depth for deep-covered areas of fluorocarbon cerium rare earth mines, wherein the sampling device comprises a bracket, a retracting and releasing mechanism, a low-background gas collection tube, a cutting head and an automatic fixed-depth sealing valve; the retracting and releasing mechanism is connected to the bracket; the low-background gas collection tube is connected to the retracting and releasing mechanism by driving; a low-background filter is provided inside the filter assembly, and the filter assembly is connected to the low-background gas collection tube; the cutting head and the automatic fixed-depth sealing valve are connected to the low-background gas collection tube and are located below the filter assembly; the retracting and releasing mechanism can release and reel the low-background gas collection tube to move the automatic fixed-depth sealing valve, the cutting head and the filter assembly to multiple predetermined positions underground for continuous sampling, and the collected gas passes through the automatic fixed-depth sealing valve, the cutting head and the low-background filter in sequence. The present application realizes continuous sampling of mineral aerosols at different depths underground in deep-covered areas of fluorocarbon cerium rare earth mines.

Description

Technical Field

[0001] The present application belongs to the technical field of gas sampling equipment, and in particular relates to a device and method for continuous sampling of mineral aerosol at a fixed depth for deep coverage areas of fluorocarbon cerium type rare earth mines. Background Art

[0002] In the exploration of fluorocarbon cerium rare earth minerals, there are large-scale areas with deep Quaternary coverage that may contain hidden rare earth ore bodies deep underground. Conventional geophysical and geochemical sampling is easily disturbed by thick surface soil, which makes a large number of hidden mineral-induced anomalies not quickly and effectively identified in geochemical exploration. Therefore, it is important to carry out scientific and effective deep-deep continuous sampling of mineral-containing rare earth aerosols in the deep Quaternary coverage area of ​​fluorocarbon cerium rare earth deposits, develop automatic continuous sampling devices with low background interference, portability, environmental protection, easy installation, no need for external power supply, and can achieve fixed depth, and carry out rapid collection of micro-nano mineral aerosols containing fluorocarbon cerium-nepheline-fluorite-barite in the deep coverage area, which is an important guarantee for the sustainable development of rare earth mines. At present, when conducting geogas measurement sampling for mineral exploration in rare earth mineral areas, it is generally directly selected to sample using the device used for geogas measurement sampling in mineral exploration, test the concentration of particulate matter, and directly evaluate the level of mineral-induced anomalies based on the element concentration of geogas measurement samples at the time of sampling. However, there may be multiple types of areas deep underground in the deep Quaternary coverage area. The aerosol elements, mineral assemblages, and vertical zoning may be different in different types of areas. In addition, the concentration of existing single-time geogas measurement samples is used to evaluate mineral anomalies. The evaluation samples are relatively single and cannot continuously obtain particulate matter samples from different well depths, which cannot meet the research needs of particulate matter samples at different depths in vertical zoning.

[0003] In the prior art, there is a membrane changing device for an air particulate sampler and an air particulate sampler, wherein a plurality of groups of filter membrane plates are arranged in a ring shape and at equal intervals around a fixed sleeve, and the filter membrane plates are changed by driving a rotating rod driven by a driving motor. When the membrane changing mechanism changes the membrane, the filter membrane plate is forcibly inserted into the gap between the upper cylinder and the lower cylinder, which is a membrane changing method with component wear. After long-term use, the sealing between the filter membrane plate and the upper cylinder and the lower cylinder will deteriorate, affecting the sampling effect. There is also a multi-channel environmental air particulate sampler, in which multiple filter membranes can be placed on the membrane disk at one time, and are directly connected to the membrane disk through a telescopic tube, but it does not have a structure for sealing and isolating a single filter membrane, nor does it isolate the collected filter membrane, which will cause cross contamination when collecting samples.

[0004] Therefore, there is an urgent need to provide a device and method for continuous sampling of mineral aerosol at a fixed depth for deep coverage areas of fluorocarbon cerium type rare earth mines. Summary of the invention

[0005] In view of the above analysis, the embodiments of the present invention aim to provide a device and method for continuous sampling of mineral aerosol at a fixed depth for deep coverage areas of fluorocarbon cerium type rare earth mines, so as to solve one or more of the above problems existing in the prior art.

[0006] The object of the present invention is achieved in that:

[0007] On the one hand, a device for continuous sampling of mineral aerosol at a fixed depth for deep coverage of bastnaesium rare earth mines is provided, comprising:

[0008] Bracket;

[0009] A retractable mechanism connected to the bracket;

[0010] A low background gas collection tube is connected to the retractable mechanism;

[0011] A filter membrane assembly, wherein a low-background filter membrane is provided inside, and the filter membrane assembly is connected to a low-background gas collection tube;

[0012] The cutting head and the automatic depth-setting sealing valve are connected to the low-background gas collection tube and are located below the filter membrane assembly;

[0013] Among them, the retracting and releasing mechanism can release and reel the low-background gas collection tube to move the automatic depth-setting sealing valve, cutting head and filter membrane assembly to multiple predetermined positions underground for continuous sampling. The collected gas passes through the automatic depth-setting sealing valve, cutting head and low-background filter membrane in turn.

[0014] Furthermore, the filter membrane assembly comprises:

[0015] A shell, a first telescopic hose mechanism is arranged at the top of the shell, a connecting pipe structure is arranged at the bottom of the shell, the first telescopic hose mechanism and the connecting pipe structure are arranged correspondingly, and both are connected to the low background gas collection pipe;

[0016] A filter frame, in which the low-background filter is placed;

[0017] The material changing mechanism is arranged in the housing, the filter membrane frames include a plurality of filter membrane frames, all of which are arranged on the material changing mechanism, the material changing mechanism is used to push the filter membrane frames onto the material changing seat, the first telescopic hose mechanism can abut against the edge of the filter membrane frame on the material changing seat, the connecting pipe structure is connected to the material changing seat, and the connecting pipe structure is connected to the hollow material changing seat;

[0018] The pushing mechanism is arranged at a corresponding position of the material changing seat and is used for pushing the filter membrane frame out of the material changing seat.

[0019] Furthermore, the filter membrane assembly also includes a moving mechanism, which is arranged in the shell, and the material changing seat is connected to the moving mechanism, and the moving mechanism can drive the material changing seat to move in the vertical direction; multiple filter membrane frames are stacked on the material changing mechanism in sequence in the vertical direction, and at each downhole position, the material changing mechanism pushes the filter membrane frame to move to the material changing seat in sequence from top to bottom.

[0020] Furthermore, the moving mechanism includes a moving platform and a moving linear motor. The material changing seat is connected to the moving platform, the moving linear motor is connected to the inner wall of the shell, the moving linear motor is drivingly connected to the moving platform, and the connecting pipe structure includes a second telescopic hose mechanism. One end of the second telescopic hose mechanism is connected to the low background gas collection pipe, and the other end passes through the moving platform and the bottom of the material changing seat and is connected to the inside of the material changing seat.

[0021] Furthermore, the filter membrane assembly also includes a accommodating bin, which includes multiple layers of slots arranged in sequence from top to bottom, and the size of the slots corresponds exactly to the filter membrane frame. The accommodating bin is arranged outside one end of the material changing seat, and the pushing mechanism is arranged outside the other end opposite to the material changing seat. The moving mechanism is configured to control the filter membrane frame on the material changing seat to stop on the side of the corresponding slot of the accommodating bin, and the pushing mechanism is configured to push the filter membrane frame into the slot of the accommodating bin.

[0022] Furthermore, the material changing mechanism comprises:

[0023] A release platform is arranged on one side of the material changing seat, the top surface of the release platform is an inclined surface, the height of the inclined surface from the side away from the material changing seat is higher than the height of the side close to the material changing seat, and a plurality of filter membrane frames are stacked obliquely on the release platform;

[0024] The material pulling mechanism is arranged on the moving mechanism and is located on the other side opposite to the material changing seat;

[0025] Auxiliary release mechanism, used to control the uppermost filter membrane frame to fall from the release platform to the material change seat, and keep the remaining filter membrane frames fixed;

[0026] Part of the filter membrane frame falls onto the material changing seat, and the pulling mechanism is used to pull the filter membrane frame to move all of it onto the material changing seat;

[0027] The height of the material changing seat is lower than the lowermost end of the inclined filter membrane frame to be received.

[0028] Further, the auxiliary release mechanism includes:

[0029] A baffle is disposed close to a side surface of the lowest side of the inclined surface of the release platform;

[0030] An auxiliary motor is connected to the baffle drive;

[0031] A bottom tooth plate is connected to the top side of the baffle plate, and the bottom tooth plate is vertically arranged;

[0032] The three-quarter gear is meshed and connected with the bottom gear plate, and a counterweight is provided on the end surface corresponding to the meshing termination position of the three-quarter gear and the bottom gear plate;

[0033] A speed change gear set is meshed and connected with the three-quarter gear, and the speed change gear set is located on the same side of the bottom gear plate;

[0034] A synchronous belt assembly drivingly connected to the speed change gear set;

[0035] The auxiliary frame is arranged on the other side of the release platform opposite to the baffle plate and is also drivingly connected to the synchronous belt assembly;

[0036] A tension spring, one end of which is connected to the auxiliary frame and the other end of which is connected to the auxiliary frame;

[0037] Wherein, magnets are arranged on opposite sides of the auxiliary frame and the filter membrane frame, and opposite sides of the magnets on the auxiliary frame and the magnets on the filter membrane frame are of the same poles that repel each other.

[0038] Furthermore, the auxiliary release mechanism also includes a side gear, a side tooth plate, and a damper, which are coaxially connected to the three-quarter gear. The side tooth plate is meshed with the side gear, the side tooth plate is drivingly connected to the damper, the side tooth plate is slidingly connected to the side slide rail, and the side slide rail and the damper are both connected to the shell.

[0039] Furthermore, the material pulling mechanism includes a material pulling motor and a material pulling plate. The material pulling plate is connected to the driving end of the material pulling motor. A magnet is connected to the material pulling plate. A support arm is provided in the material changing seat. The magnet is inserted into the material changing seat. A corresponding magnet is provided at the bottom of the filter membrane frame. The magnet on the material pulling plate and the magnet at the bottom of the filter membrane frame have opposite poles that attract each other.

[0040] On the other hand, the present application also provides a method for continuous sampling of mineral aerosols at a fixed depth in deep-covered areas of fluorocarbon cerium type rare earth mines, and uses the above-mentioned continuous sampling device for continuous sampling of mineral aerosols at a fixed depth in deep-covered areas of fluorocarbon cerium type rare earth mines to continuously sample mineral aerosols at different depths underground in deep-covered areas of fluorocarbon cerium type rare earth mines.

[0041] Furthermore, the continuous sampling method comprises the following steps:

[0042] The retracting and releasing mechanism is started to slowly release the low background gas collection tube, and the automatic depth-setting sealing valve, cutting head and filter membrane assembly are gradually lowered to the designated position underground;

[0043] When it is lowered to the predetermined position, the automatic depth-setting sealing valve starts to open and starts to collect gas at that depth; the collected gas passes through the automatic depth-setting sealing valve, cutting head and low-background filter membrane in turn to screen and capture particles of specific particle sizes; after completing one sampling, the automatic depth-setting sealing valve is closed;

[0044] The retracting and releasing mechanism continues to move the automatic depth-fixed sealing valve to the next predetermined position, and the sampling process is repeated;

[0045] After completing the continuous sampling, the low background gas collection tube and the filter membrane assembly are rolled back to the ground, and the low background filter membrane is taken out.

[0046] Compared with the prior art, the device and method for continuous sampling of mineral aerosol at a fixed depth for deep coverage areas of bastnaesium rare earth mines provided by the present invention have at least one of the following beneficial effects:

[0047] 1. By starting the retractable mechanism, the low-background gas collection tube is lowered to the predetermined position, the automatic depth-setting sealing valve is started, and the gas at the depth begins to be collected; the collected gas passes through the automatic depth-setting sealing valve, the cutting head and the low-background filter membrane in turn to screen and capture particles of a specific particle size; the retractable mechanism continues to move the automatic depth-setting sealing valve to the next predetermined position and repeats the sampling process; after completing the continuous sampling, the low-background gas collection tube and the filter membrane assembly are rolled back to the ground, and the low-background filter membrane is taken out to achieve accurate and continuous sampling of gases at different depths underground in the deep coverage area of ​​fluorocarbon cerium rare earth mines.

[0048] 2. The material changing mechanism can realize non-destructive membrane changing, and the sealing cover and the material changing seat form a sealed environment, which can avoid cross contamination between samples during the sampling process.

[0049] 3. Use low background filter membrane with low background value, which can minimize the interference of impurities contained in it on the sampling results. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0051] Figure 1 The structure of the device for continuous sampling of mineral aerosol at a fixed depth for deep coverage of bastnaesium rare earth mines provided by the present invention is shown in FIG. Figure 1 ;

[0052] Figure 2 The structure of the device for continuous sampling of mineral aerosol at a fixed depth for deep coverage of bastnaesium rare earth mines provided by the present invention is shown in FIG. Figure 2 ;

[0053] Figure 3 The structure of the filter membrane assembly provided by the present invention is schematically shown Figure 1 ;

[0054] Figure 4 The structure of the filter membrane assembly provided by the present invention is schematically shown Figure 2 ;

[0055] Figure 5 The structure of the filter membrane assembly provided by the present invention is schematically shown Figure 3 ;

[0056] Figure 6 The structure of the filter membrane assembly provided by the present invention is schematically shown Figure 4 ;

[0057] Figure 7 A schematic structural diagram of the auxiliary release mechanism of the filter membrane assembly provided by the present invention.

[0058] Reference numerals:

[0059] 10. Bracket; 11. Retractable mechanism; 12. Low background gas collection tube; 13. Cutting head; 14. Automatic fixed depth sealing valve; 15. Gas capturer; 20. Filter membrane assembly; 31. Shell; 32. First telescopic hose mechanism; 33. Filter membrane frame; 34. Material changing seat; 341. Support arm; 40. Receiving bin; 50. Material changing mechanism; 51. Release platform; 52. Material pulling mechanism; 521. Material pulling motor; 522. Material pulling plate; 53. Auxiliary release mechanism; 531. Baffle; 532. Auxiliary frame; 533. Bottom gear plate; 534. Three-quarter gear; 535. Counterweight; 536. Engagement end position; 537. Speed ​​change gear set; 538. Synchronous belt assembly; 54. Tension spring; 55. Magnet; 56. Side gear plate; 57. Damper; 60. Moving mechanism; 601. Moving platform. DETAILED DESCRIPTION

[0060] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0061] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connected" should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or an integral connection, which can be a mechanical connection, or an electrical connection, which can be a direct connection, or can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] The terms "top", "bottom", "above", "lower", and "on" used throughout the description are relative to the relative positions of components of a device, such as the relative positions of the top and bottom substrates within a device. It is understood that devices are multifunctional regardless of their orientation in space.

[0063] Example 1

[0064] A specific embodiment of the present invention, as Figures 1 to 7 As shown, a device for continuous sampling of mineral aerosols at a fixed depth for deep-covered areas of fluorocarbon cerium rare earth mines is disclosed, comprising a bracket 10, a retracting mechanism 11, a low-background gas collection tube 12 and a sampling mechanism; the sampling mechanism is connected to the underground mobile end of the low-background gas collection tube 12, and the upper part of the low-background gas collection tube 12 is connected to the retracting mechanism 11, which is arranged on the bracket 10 and configured to control the sampling mechanism at different depths underground to achieve continuous sampling of mineral aerosols at different depths underground. The sampling mechanism comprises an automatic fixed-depth sealing valve 14, a cutting head 13 and a filter membrane assembly 20 arranged from bottom to top, and the filter membrane assembly 20 is fixedly connected and communicated with the underground mobile end of the low-background gas collection tube 12.

[0065] Specifically, the low background gas collection tube 12 is driven and connected to the retracting and releasing mechanism 11; a low background filter membrane is provided inside the filter membrane assembly 20, and the filter membrane assembly 20 is connected to the low background gas collection tube 12; the low background gas collection tube 12 is also connected to a cutting head 13 and an automatic depth-setting sealing valve 14 in sequence below the filter membrane assembly 20; the retracting and releasing mechanism 11 can release and reel the low background gas collection tube 12 to move the automatic depth-setting sealing valve 14 together with the cutting head 13 and the filter membrane assembly 20 to multiple predetermined positions underground for continuous sampling, and the collected gas passes through the automatic depth-setting sealing valve 14, the cutting head 13 and the low background filter membrane in sequence, and the particulate matter samples in the gas are collected on the low background filter membrane.

[0066] During implementation, the support 10 is firmly placed at the wellhead, and the retracting mechanism 11 is connected to the support 10, and the release and reeling of the low background gas collection tube are controlled by the retracting mechanism 11. During sampling, the retracting mechanism 11 releases the low background gas collection tube 12. During the release process, the operating state of the retracting mechanism is monitored in real time so that the low background gas collection tube can be lowered smoothly; after the filter membrane assembly 20, the cutting head 13 and the automatic depth-setting sealing valve 14 of the sampling mechanism are lowered to the predetermined position underground at the same time, the automatic depth-setting sealing valve 14 is started and opened to start collecting gas at the depth. The cutting head 13 can screen the particle size of the particles in the incoming gas and screen out the particles that meet specific requirements. The automatic depth-setting sealing valve 14 can automatically open when reaching the predetermined underground depth position, and the collected gas passes through the automatic depth-setting sealing valve 14, the cutting head 13 in turn, and then passes through the low background filter membrane of the filter membrane assembly 20. Since the low background filter has a low background value and high efficiency filtering performance, it can effectively capture and retain target particles and reduce the influence of background interference and impurities. After completing the sampling of mineral aerosol at a predetermined position, the automatic fixed depth sealing valve 14 is closed, and the retracting mechanism 11 moves the low background gas collection tube to the next predetermined position, and repeats the above sampling process, thereby achieving continuous sampling at multiple positions. Through such a process, accurate and continuous sampling of mineral aerosols at different depths underground in the deep coverage area of ​​fluorocarbon cerium rare earth mines is achieved.

[0067] In this embodiment, the mineral aerosol fixed-depth continuous sampling device for deep-covered areas of fluorocarbon cerium rare earth mines also includes a solar power supply device, which is configured to supply power to the operation of the mineral aerosol sampling device. Specifically, the power-consuming part of the device is powered by a solar panel, and the solar power supply device includes a solar panel and a battery. The solar panel is arranged on a bracket 10, and the solar panel is connected to the battery through a cable, and can store the electric energy converted from solar energy in the battery.

[0068] In this embodiment, the support 10 is fixed at the wellhead, the retractable mechanism 11 can be a retractable motor, the low background gas collection tube 12 is wound on the driving end of the retractable motor, and the retractable motor can be started to release the low background gas collection tube 12 or reel it in. The automatic depth-fixed sealing valve 14 can be an electric valve, which is opened and closed by a motor control.

[0069] In this embodiment, the low background gas collection tube 12 has a certain strength and can bear the weight of various components underground. It also has the function of guiding gas, and can smoothly enter the filter membrane assembly 20 for the gas at the specified depth underground during each sampling, and discharge the gas filtered by the filter membrane assembly 20 to the wellhead, so that the underground gas environment is always in a relatively stable state during the entire continuous sampling process, avoiding the disturbance of the underground air flow caused by directly discharging the filtered gas into the territory. The above-mentioned setting of this embodiment can prevent the gas discharged from the filter membrane assembly 20 from disturbing the underground gas environment, causing the mixing of gases at different depths, and then causing cross-contamination of gas samples at different depths.

[0070] In one of the optional embodiments, the low background gas collection tube 12 is also connected to a fan at the wellhead to provide a certain suction force for the gas to smoothly enter the filter membrane assembly 20 during the sampling process, and at the same time, it can also promptly extract the gas discharged from the filter membrane assembly 20 under relatively closed conditions.

[0071] In this embodiment, due to the high background value of rare earth elements in the current ground gas capture device and sampling filter membrane, the sampling and analysis of the fluorine-containing carbon cerium ore-nepheline-fluorite-barite micro-nano mineral aerosol hidden deep underground in the prior art is prone to errors. Therefore, in this embodiment, the composition of the low-background gas collection tube 12 is free of rare earth element background, F, Ca and quartz fiber, etc., which can reduce the interference with the elements in the gas. The low-background filter membrane adopts a special material electron microscope filter membrane that can be used for SEM TEM analysis. It is translucent, free of rare earth element background, F, Ca and quartz fiber, etc. Its pore size and distribution only allow target particles of a specific particle size to pass through and be effectively captured and retained, while blocking other irrelevant impurities and interfering substances.

[0072] In one of the optional embodiments, the cutting head 13 may be a PM2.5 or PM10 cutting head 13, including a main body, a particle impact chamber and a particle size separator, and is used to collect aerosol samples of a set particle size.

[0073] In one optional embodiment, Figure 2 As shown, the low background gas collection tube 12 can also be connected to a gas capturer 15, and the automatic fixed depth sealing valve 14 is connected to the gas capturer 15. The gas capturer 15 is used to collect aerosol gas samples at a fixed depth, and the fixed depth collection bag can be automatically sealed and replaced, so as to realize the collection of gas samples at different depths in the borehole for gas chromatography analysis.

[0074] In one of the optional implementations, the portion of the low background gas collection pipe 12 located underground is also sleeved with a protection pipe for protecting the low background gas collection pipe 12 .

[0075] In some embodiments, the filter membrane assembly 20 includes a shell 31, in which a material changing mechanism 50 is provided; a first telescopic hose mechanism 32 is provided at the top of the shell 31, and a connecting pipe structure is provided at the bottom of the shell 31, the first telescopic hose mechanism 32 and the connecting pipe structure are correspondingly arranged, and both are connected to the low background gas collection pipe 12; a filter membrane frame 33, in which the low background filter membrane is placed; the filter membrane frame 33 includes multiple ones, all of which are arranged on the material changing mechanism 50, and the material changing mechanism 50 is used to push the filter membrane frame 33 onto the material changing seat 34, the first telescopic hose mechanism 32 can abut against the edge of the filter membrane frame 33 on the material changing seat 34, the connecting pipe structure is connected to the material changing seat 34, and the connecting pipe structure is connected to the hollow material changing seat 34; a pushing mechanism is arranged at a corresponding position of the material changing seat 34, and is used to push the filter membrane frame 33 out of the material changing seat 34. The first telescopic hose mechanism 32 can be a first telescopic hose motor driving the first hose to move, and a sealing cover is also connected to the end of the first hose. When the first telescopic hose mechanism 32 abuts against the material changing seat 34, the sealing cover just abuts against the filter membrane frame 33, so that the first hose and the low background filter membrane are just in communication. At the same time, the sealing cover and the material changing seat 34 form a sealed environment, and the low background filter membrane is in a sealed environment, thereby avoiding cross contamination between samples during the sampling process.

[0076] The filter membrane frame 33 is a rectangular structure, and a plurality of spaced support rods are arranged in the filter membrane frame 33 to support the low background filter membrane. A low background filter membrane is installed in each filter membrane frame 33 .

[0077] After the membrane filter assembly 20 reaches a predetermined position, the material changing mechanism 50 pushes the membrane filter frame 33 onto the material changing seat 34, and the first telescopic hose mechanism 32 abuts against the membrane filter frame 33 to start sampling. After the low background membrane sampling is completed, the first telescopic hose mechanism 32 is reset, and the pushing mechanism pushes the membrane filter frame 33 out of the material changing seat 34. When the membrane filter assembly 20 moves to the next position, the above sampling steps are repeated.

[0078] In some embodiments, a moving mechanism 60 is also provided in the shell 31, and the material changing seat 34 is connected to the moving mechanism 60, and the moving mechanism 60 can drive the material changing seat 34 to move in the vertical direction; multiple filter membrane frames 33 are stacked in sequence on the material changing mechanism 50 in the vertical direction, and at each downhole position, the material changing mechanism 50 pushes the filter membrane frame 33 from top to bottom to move to the material changing seat 34; wherein, the connecting pipe structure includes a second telescopic hose mechanism.

[0079] Optionally, the moving mechanism 60 includes a moving platform 601 and a moving linear motor, the material changing seat 34 is connected to the moving platform 601, the moving linear motor is connected to the inner wall of the housing 31, the moving linear motor is drivingly connected to the moving platform 601, one end of the second telescopic hose mechanism is connected to the low background gas collection tube 12, and the other end thereof passes through the moving platform 601 and the bottom of the material changing seat 34, and is connected to the inside of the material changing seat 34. The second telescopic hose mechanism includes a second hose, which is connected to the moving platform 601, and whose length changes with the movement of the moving platform 601.

[0080] By moving the linear motor to drive the moving platform 601 to rise and fall, the height of the material changing seat 34 can change accordingly with the height of the material changing mechanism 50 after the material is changed. Since the filter membrane frame 33 on the material changing mechanism 50 is stacked up and down, its overall height decreases during the continuous material changing process. Therefore, through the height adjustment of the moving platform 601, the height of the material changing seat 34 and the material changing mechanism 50 is always kept in relative balance, avoiding the filter membrane frame 33 from being unable to enter the material changing seat 34.

[0081] In some embodiments, the filter membrane assembly 20 also includes a containing bin 40, which includes multiple layers of slots arranged in sequence from top to bottom, and the size of the slots is adapted to the filter membrane frame 33. The containing bin 40 is arranged outside one end of the material changing seat 34, and the pushing mechanism is arranged outside the other end opposite to the material changing seat 34. The moving mechanism 60 is configured to control the filter membrane frame 33 on the material changing seat 34 to stop on the side of the corresponding slot of the containing bin 40, and the pushing mechanism is configured to push the filter membrane frame 33 into the slot of the containing bin 40.

[0082] By setting up the storage bin 40, since the storage bin 40 has multiple layers of slots arranged in sequence from top to bottom, and the size of the slots corresponds exactly to the filter membrane frame 33, after the low-background filter membrane sampling on the filter membrane frame 33 at one position is completed, the pushing mechanism pushes the filter membrane frame 33 into a slot of the storage bin 40 for sealed storage. Since the size of the slots corresponds exactly to the filter membrane frame 33, the filter membrane frame 33 fits into the slot to seal the low-background filter membrane. After sampling at the next position, the pushing mechanism immediately pushes the filter membrane frame 33 into a slot of the lower layer to prevent cross-infection of the low-background filter membrane. The pushing mechanism includes a pushing motor and a pushing plate.

[0083] In some embodiments, the material changing mechanism 50 includes: a release platform 51, which is arranged on one side of the material changing seat 34, and the top surface of the release platform 51 is a slope, and the height of the slope from the side away from the material changing seat 34 is higher than the height of the side close to the material changing seat 34, and multiple filter membrane frames 33 are stacked obliquely on the release platform 51; a pulling mechanism 52, which is arranged on the moving mechanism 60 and is located on the other side opposite to the material changing seat 34; an auxiliary release mechanism 53, which is used to control the uppermost filter membrane frame 33 to fall from the release platform 51 to the material changing seat 34, and keep the remaining filter membrane frames 33 fixed; wherein, some filter membrane frames 33 fall onto the material changing seat 34, and the pulling mechanism 52 is used to pull all the filter membrane frames 33 to move to the material changing seat 34; the height of the material changing seat 34 is lower than the bottom of the lowest end of the inclined filter membrane frame 33 to be received. The auxiliary release mechanism 53 includes: a baffle 531, which is arranged on a side surface close to the lowest side of the inclined surface of the release platform 51; an auxiliary motor, which is connected to the baffle 531; a bottom gear plate 533, which is connected to the top side of the baffle 531, and the bottom gear plate 533 is vertically arranged; a three-quarter gear 534, which is meshed and connected with the bottom gear plate 533, and a counterweight 535 is arranged on the end surface corresponding to the meshing termination position 536 of the three-quarter gear 534 and the bottom gear plate 533. It can also be understood that the counterweight 535 is arranged on the end surface of the three-quarter gear 534 and is located at the starting end of the 3 / 4 circumferential teeth of the three-quarter gear 534; the three-quarter gear 534 refers to a gear with 3 / 4 circumference teeth on its outer circumference, and no teeth on the other 1 / 4 circumference; the baffle 531 is lowered by a height of the filter frame 33, which can make the three-quarter gear 534 from the toothed side The end rotates to the other end with teeth, that is, the three-quarter gear 534 can push out a filter frame 33 every time it is fully meshed and rotated; the speed change gear set 537 is meshed and connected with the three-quarter gear 534, and the speed change gear set 537 is located on the same side of the bottom gear plate 533, and the meshing position of the speed change gear set 537 and the bottom gear plate 533 are collinear; the synchronous belt assembly 538 is drivingly connected to the speed change gear set 537; the auxiliary frame 532 is arranged on the other side of the release platform 51 opposite to the baffle 531, and is also drivingly connected to the synchronous belt assembly 538; the tension spring 54 is connected to the auxiliary frame 532 at one end and to the auxiliary frame 532 at the other end; magnets 55 are provided on the opposite sides of the auxiliary frame 532 and the filter frame 33, and the opposite sides of the magnet 55 on the auxiliary frame 532 and the magnet 55 on the filter frame 33 are repelling same poles. In this embodiment, firstly, the filter membrane frames 33 are stacked from top to bottom, and under the action of gravity, the filter membrane frames 33 can automatically slide toward the material changing seat 34, but the sliding distance is short.

[0084] It should also be noted that the starting position of the material changing seat 34 and the position after the filter membrane frame 33 is stacked, and the height of the material changing seat 34 is lower than the lowermost end of the inclined filter membrane frame 33 to be received. After such configuration, it is also necessary to ensure that one end of the filter membrane frame 33 can fall onto the sliding seat after sliding. At this time, there are the following two structural settings:

[0085] In the first structural setting, the gap between the release platform 51 and the filter membrane frame 33 as a whole and the material changing seat 34 is smaller than the width of the filter membrane frame 33, and the inclination of the inclined surface is set so that after one end slides down to the material changing seat 34, the other end is still on the lower filter membrane frame 33, so that the sliding filter membrane frame 33 will not fall.

[0086] The second structural setting is that the baffle 531 is driven to move by the auxiliary motor, and the initial position of the baffle 531 is set to be level with the filter frame 33 at the top of the release platform 51. When sampling is required, the baffle 531 moves downward by the height of the filter frame 33. When the baffle 531 moves, it drives the bottom gear plate 533 to move, and the movement of the bottom gear plate 533 drives the three-quarter gear 534 to rotate, and the rotation of the three-quarter gear 534 drives the speed change gear set 537 to rotate, and the speed change gear set 537 drives the synchronous belt assembly 538 to move, and then the auxiliary frame 532 moves toward the filter frame 33. Since the side of the filter frame 33 and the auxiliary frame 532 are provided with repelling magnets 55, the two have repulsive force. Among them, the driving direction between the speed change gear set 537, the three-quarter gear 534 and the synchronous belt assembly 538 should be reasonably configured. So that the auxiliary frame 532 moves toward the filter frame 33.

[0087] After the membrane frame 33 is repelled, the baffle 531 just moves out of the lowest surface of the membrane frame 33 and just lies on the top surface of the membrane frame 33 below. It should be noted that the top surface of the baffle 531 should also be set on the same slope as the slope of the release platform 51 to avoid obstruction of the membrane frame 33 passing through the baffle 531. Then, the membrane frame 33 is pushed out by the relative force. Due to the certain thrust, the membrane frame 33 has an initial speed, so that the gap between the release platform 51 and the material changing seat 34 can be set according to the thrust, regardless of the gap being smaller than the width of the membrane frame 33. After part of the membrane frame 33 falls into the material changing seat 34, the pulling mechanism 52 is controlled to pull the membrane frame 33 to move completely into the material changing seat 34, and the pulling mechanism 52 is reset.

[0088] After the filter membrane frame 33 pops out of the release platform 51, the three-quarter gear 534 has no teeth in the latter part of the original rotation direction. At this time, the position of the counterweight 535 is set to the 3 o'clock position of the clock. At this time, under the action of gravity, the three-quarter gear 534 rotates along the original rotation direction, the counterweight 535 rotates to the 6 o'clock position, and the three-quarter gear 534 engages with the bottom gear plate 533 again.

[0089] During the process of the three-quarter gear 534 rotating along the original rotation direction and the counterweight 535 rotating from the 3 o'clock position to the 6 o'clock position, due to the lack of gear meshing connection, and the setting position of the speed change gear set 537, the speed change gear set 537 and the three-quarter gear 534 are not meshed, the auxiliary frame 532 is reset due to the action of the force and the tension spring 54, the synchronous belt assembly 538 can be reset, and the three-quarter gear 534 is reset. It can be understood that the process of the counterweight 535 rotating from the 3 o'clock position to the 6 o'clock position can realize the reset of the auxiliary frame 532 and the synchronous belt assembly 538, and at the same time ensure that the position of the bottom toothed plate 533 is constant, so that the next sampling operation can be carried out.

[0090] In some embodiments, the auxiliary release mechanism 53 also includes a side gear, a side tooth plate 56, and a damper 57 coaxially connected to the three-quarter gear 534, the side tooth plate 56 is meshed with the side gear, the side tooth plate 56 is drivingly connected to the damper 57, the side tooth plate 56 is slidingly connected to the side slide rail, and the side slide rail and the damper 57 are both connected to the shell 31.

[0091] By providing the damper 57, the process of the counterweight 535 rotating from the 3 o'clock position to the 6 o'clock position can be slowed down, thereby increasing the reset time of the component and achieving accurate reset.

[0092] In some embodiments, the material pulling mechanism 52 includes a material pulling motor 521 and a material pulling plate 522. The material pulling plate 522 is connected to the driving end of the material pulling motor 521. A magnet 55 is connected to the material pulling plate 522. A support arm 341 is provided in the material changing seat 34. The support arm 341 serves to support the side wall of the material changing seat 34. The magnet 55 is inserted into the material changing seat 34. A corresponding magnet 55 is provided at the bottom of the filter membrane frame 33. The magnet 55 on the material pulling plate 522 and the magnet 55 at the bottom of the filter membrane frame 33 have opposite poles that attract each other.

[0093] The material pulling motor 521 pushes the material pulling plate 522 to move, so that the magnet 55 extends into the material changing seat 34, and the bottom of the part of the filter membrane frame 33 located on the material changing seat 34 is used for the magnet 55 to attract each other, so that when the material pulling motor 521 is reset, it drives the filter membrane frame 33 to move, so that the filter membrane frame 33 is completely moved into the material changing seat 34. After the material pulling motor 521 is reset, part of the magnet 55 is still located in the material changing seat 34, thereby realizing the sealing of the moving opening of the magnet 55 of the material changing seat 34.

[0094] The baffle 531 is arranged at the middle position of the release platform 51. The auxiliary frame 532 is penetrated by the guide rod to support the movement of the auxiliary frame 532. At the same time, a plurality of parallel magnets 55 are installed at intervals on the auxiliary frame 532 to ensure the balance of thrust.

[0095] The present application also provides a method for continuous sampling of mineral aerosols at a fixed depth in deep-covered areas of fluorocarbon cerium type rare earth mines, and uses the above-mentioned continuous sampling device for continuous sampling of mineral aerosols at a fixed depth in deep-covered areas of fluorocarbon cerium type rare earth mines to continuously sample mineral aerosols at different depths underground in deep-covered areas of fluorocarbon cerium type rare earth mines.

[0096] Specifically, the method for continuous sampling of mineral aerosol at a fixed depth in a deep-covered area of ​​a fluorocarbon cerium-type rare earth mine comprises the following steps:

[0097] The support of the device is firmly placed at the wellhead, and the retracting mechanism is connected to the support; the retracting mechanism 11 is started, and the low background gas collection tube 12 is slowly released, and the sampling mechanism is gradually lowered to the designated position underground, that is, the low background gas collection tube drives the filter membrane assembly, the cutting head and the automatic fixed depth sealing valve to move downward at the same time until they are lowered to the designated position; during the release process, the operating state of the retracting mechanism 11 is monitored in real time, so that the low background gas collection tube 12 can be lowered smoothly;

[0098] When the low-background gas collection tube 12 is lowered to a predetermined position, the automatic depth-setting sealing valve 14 is started and opened to start collecting gas at that depth; the collected gas passes through the automatic depth-setting sealing valve 14, the cutting head 13 and the low-background filter membrane in sequence to screen and capture particles of a specific particle size; after completing one sampling, the automatic depth-setting sealing valve 14 is closed to prevent gas from entering;

[0099] The retracting and releasing mechanism 11 continues to move the automatic depth-fixed sealing valve 14 to the next predetermined position, and the sampling process is repeated;

[0100] After the continuous sampling is completed, the low background gas collection tube 12 and the filter membrane assembly 20 are rolled back to the ground, and the low background filter membrane is taken out.

[0101] Based on the above sampling steps, the mineral aerosol at different depths underground in the deep coverage area of ​​fluorocarbon cerium type rare earth mine can be accurately and continuously sampled.

[0102] The above specific implementation methods further illustrate the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above are only specific implementation methods of the present application and are not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A device for continuous sampling of mineral aerosol at a fixed depth for deep coverage areas of fluorocarbon cerium rare earth mines, characterized in that: include: Bracket; A retractable mechanism connected to the bracket; A low background gas collection tube is drivingly connected to the retractable mechanism; A filter membrane assembly, wherein a low-background filter membrane is provided inside, and the filter membrane assembly is connected to the low-background gas collection tube; A cutting head and an automatic depth-setting sealing valve are connected to the low-background gas collection tube and are located below the filter membrane assembly; The retractable mechanism can release and reel the low-background gas collection tube to move the automatic depth-setting sealing valve, the cutting head and the filter membrane assembly to multiple predetermined positions in the well for continuous sampling, and the collected gas passes through the automatic depth-setting sealing valve, the cutting head and the low-background filter membrane in sequence; The filter membrane assembly comprises: A shell, wherein a first telescopic hose mechanism is disposed at the top of the shell, and a connecting pipe structure is disposed at the bottom of the shell, wherein the first telescopic hose mechanism and the connecting pipe structure are disposed correspondingly, and both are connected to the low background gas collection pipe; A filter membrane frame, wherein the low background filter membrane is placed in the filter membrane frame; A material changing mechanism is arranged in the housing, the filter membrane frames include a plurality of filter membrane frames, all of which are arranged on the material changing mechanism, the material changing mechanism is used to push the filter membrane frame onto the material changing seat, the first telescopic hose mechanism can abut against the edge of the filter membrane frame on the material changing seat, the connecting pipe structure is connected to the inside of the material changing seat, and the connecting pipe structure is connected to the hollow material changing seat; A pushing mechanism, arranged at a position corresponding to the material changing seat, for pushing the filter membrane frame out of the material changing seat; A moving mechanism is arranged in the shell, and the material changing seat is connected to the moving mechanism. The moving mechanism can drive the material changing seat to move in the vertical direction; a plurality of the filter membrane frames are stacked on the material changing mechanism in sequence in the vertical direction, and at each downhole position, the material changing mechanism pushes the filter membrane frames to move to the material changing seat in sequence from top to bottom.

2. The device for continuous sampling of mineral aerosol at a fixed depth for deep coverage areas of bastnaesium rare earth mines according to claim 1, characterized in that: The moving mechanism includes a moving platform and a moving linear motor. The material changing seat is connected to the moving platform. The moving linear motor is connected to the inner wall of the shell. The moving linear motor is drivingly connected to the moving platform. The connecting pipe structure includes a second telescopic hose mechanism. One end of the second telescopic hose mechanism is connected to the low background gas collection pipe, and the other end passes through the moving platform and the bottom of the material changing seat and is connected to the inside of the material changing seat.

3. The device for continuous sampling of mineral aerosol at a fixed depth for deep coverage areas of bastnaesium rare earth mines according to claim 1, characterized in that: The filter membrane assembly also includes a containing bin, which includes multiple layers of slots arranged in sequence from top to bottom, and the size of the slots corresponds exactly to the filter membrane frame. The containing bin is arranged outside one end of the material changing seat, and the pushing mechanism is arranged outside the other end opposite to the material changing seat. The moving mechanism is configured to control the filter membrane frame on the material changing seat to stop on the side of the corresponding slot of the containing bin, and the pushing mechanism is configured to push the filter membrane frame into the slot of the containing bin.

4. The device for continuous sampling of mineral aerosol at a fixed depth for deep coverage areas of bastnaesium rare earth mines according to claim 1, characterized in that: The material changing mechanism comprises: A release platform is arranged on one side of the material changing seat, the top surface of the release platform is an inclined surface, the height of the inclined surface from the side away from the material changing seat is higher than the height of the side close to the material changing seat, and a plurality of the filter membrane frames are stacked obliquely on the release platform; A material pulling mechanism is arranged on the moving mechanism and is located on the other side opposite to the material changing seat; An auxiliary release mechanism, used to control the uppermost filter membrane frame to fall from the release platform to the material changing seat, and to keep the remaining filter membrane frames fixed; Part of the filter membrane frame falls onto the material changing seat, and the material pulling mechanism is used to pull the filter membrane frame to move all of it onto the material changing seat; The height of the material changing seat is lower than the lowermost end of the inclined filter membrane frame to be received.

5. The device for continuous sampling of mineral aerosol at a fixed depth for deep coverage areas of bastnaesium rare earth mines according to claim 4, characterized in that: The auxiliary release mechanism comprises: A baffle plate is disposed close to a side surface of the lowest edge of the inclined surface of the release platform; An auxiliary motor, drivingly connected to the baffle; A bottom tooth plate connected to the top side of the baffle, wherein the bottom tooth plate is vertically arranged; A three-quarter gear is meshed and connected with the bottom gear plate, and a counterweight is provided on the end surface corresponding to the meshing termination position of the three-quarter gear and the bottom gear plate; a speed change gear set, meshingly connected with the three-quarter gear, the speed change gear set being located on the same side of the bottom gear plate; A synchronous belt assembly, drivingly connected to the speed change gear set; An auxiliary frame, arranged on the other side of the release platform opposite to the baffle, and also drivingly connected to the synchronous belt assembly; A tension spring, one end of which is connected to the auxiliary frame, and the other end of which is connected to the auxiliary frame; Wherein, magnets are arranged on opposite sides of the auxiliary frame and the filter membrane frame, and opposite sides of the magnets on the auxiliary frame and the magnets on the filter membrane frame are of the same poles that repel each other.

6. The device for continuous sampling of mineral aerosol at a fixed depth for deep coverage areas of bastnaesium rare earth mines according to claim 5, characterized in that: The auxiliary release mechanism also includes a side gear, a side tooth plate, and a damper, which are coaxially connected to the three-quarter gear. The side tooth plate is meshed with the side gear, the side tooth plate is drivingly connected to the damper, the side tooth plate is slidingly connected to the side slide rail, and the side slide rail and the damper are both connected to the shell.

7. A method for continuous sampling of mineral aerosol at a fixed depth in a deep-covered area of ​​a fluorocarbon cerium type rare earth mine, characterized in that: The mineral aerosol fixed-depth continuous sampling device for deep-covered areas of fluorocarbon cerium type rare earth mines as described in any one of claims 1 to 6 is used to continuously sample mineral aerosols at different depths underground in deep-covered areas of fluorocarbon cerium type rare earth mines.

8. The method for continuous sampling of mineral aerosol at a fixed depth for deep coverage areas of bastnaesium rare earth mines according to claim 7, characterized in that: The steps include: The retracting and releasing mechanism is started to slowly release the low background gas collection tube, and the automatic depth-setting sealing valve, cutting head and filter membrane assembly are gradually lowered to the designated position underground; When it is lowered to the predetermined position, the automatic depth-setting sealing valve starts to open and starts to collect gas at that depth; the collected gas passes through the automatic depth-setting sealing valve, cutting head and low-background filter membrane in turn to screen and capture particles of specific particle sizes; after completing one sampling, the automatic depth-setting sealing valve is closed; The retracting and releasing mechanism continues to move the automatic depth-fixed sealing valve to the next predetermined position, and the sampling process is repeated; After completing the continuous sampling, the low background gas collection tube and the filter membrane assembly are rolled back to the ground, and the low background filter membrane is taken out.

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