A groundwater stratification sampling device

Abstract

The present invention provides a groundwater stratified sampling device, including a vehicle body, a hoisting mechanism, a sampling assembly and a charging and pumping mechanism. The connection seat at the top of the central tube of the sampling assembly is equipped with a hanging buckle, and multiple sections of composite tubes are set between the guide head at the bottom of the central tube and the connection seat; the inner side of each section of the composite tube is a composite inner tube, and there is a sealed cavity and a combined cavity between the composite inner tube and the composite outer tube; the sampling tube end of the charging and pumping mechanism is connected to the pumping mechanism, the outer end of the air blast tube is connected to the air supply mechanism, and the water pumping port on the outer wall of the composite tube is connected to the sampling tube; an air bag is set in the combined space, and the air nozzle at the bottom of the air bag is connected to the inner cavity of the air blast tube. The sealed cavity and combined cavity formed by the composite tube design of the present invention ensure that water samples of different depths can be collected independently, avoid cross contamination between samples, and significantly improve the efficiency of the sampling process and the accuracy of the samples.

Description

Technical Field

[0001] The invention belongs to the technical field of groundwater lifting and sampling equipment, and in particular relates to a groundwater stratified sampling device. Background Art

[0002] Groundwater stratified sampling is a method used to collect groundwater samples at different depths, aiming to obtain accurate groundwater layer information through stratified sampling technology. Its main purpose is to understand the physical, chemical and biological characteristics of groundwater at different depths in order to carry out water quality monitoring, environmental assessment and resource management. Stratified sampling is widely used in geological exploration, environmental protection, water resources management and pollution investigation.

[0003] In the prior art, groundwater stratified sampling usually adopts the drilling sampling method. The specific steps include using a drilling rig to drill a hole to a predetermined depth, and then collecting water samples at different depths through a sampling pipe or sampling device. These devices include sampling pumps, stratified samplers, and airbag samplers. The existing stratified sampling method can basically meet the sampling needs of shallow and middle groundwater, and provide certain groundwater layer information.

[0004] Although existing technologies are capable of stratified groundwater sampling, there are many problems and deficiencies in deep groundwater sampling. For example: Water pressure influence: During deep sampling, the pressure of groundwater causes water flows at different levels to interflow with each other, causing the groundwater barriers to lose their stratified characteristics, and the sampling results are difficult to reflect the true groundwater layer conditions. Mixed water sample problem: Due to the limitations of groundwater pressure and sampling devices, existing technologies often collect mixed water samples, which cannot accurately reflect the independent characteristics of each layer of groundwater, affecting the accuracy of water quality analysis. Equipment stability and operating difficulty: Existing stratified sampling equipment has poor stability and complex operation when operated at deep levels, and is prone to mechanical failures and sampling failures. Sample contamination risk: In existing technologies, sample contamination may occur during the sampling process, resulting in the collected water samples being unrepresentative and unable to provide reliable data support.

[0005] In order to solve the problems existing in the existing technology such as the difficulty of deep groundwater stratified sampling, mixed water sample problems, complex equipment operation and sample contamination, an efficient and stable groundwater stratified sampling device is urgently needed to ensure the accuracy of the sampling process and the integrity of the samples. Summary of the invention

[0006] In view of the defects and problems existing in the prior art, the present invention aims to provide a groundwater stratified sampling device, which can realize the independent collection of multi-layer water samples through an efficient and stable structural design, thereby ensuring the integrity and accuracy of the samples.

[0007] The solution of the present invention to solve the technical problem is: a groundwater stratified sampling device is adopted, including a vehicle body, a hoisting mechanism, a sampling component and a charging and pumping mechanism, the hoisting mechanism is installed on the top of the vehicle frame, and the sampling component is hoisted at the lower end of the lifting rope of the hoisting mechanism; the sampling component includes a central tube and a composite tube, a connecting seat is fixed on the top of the central tube, a hanging buckle is installed on the connecting seat, and the hanging buckle is connected to the end of the lifting rope; a guide head is installed on the bottom thread of the central tube, and multiple sections of composite tubes are sequentially installed from top to bottom between the upper connecting seat and the lower guide head and on the outer side of the central tube; the inner side of each section of the composite tube is a composite inner tube, and the outer side is a composite outer tube, and the composite inner tube and the composite outer tube are fixed as a whole through multiple annular partitions; there is a sealing member between the composite inner tube and the composite outer tube. The vehicle frame comprises a sealed cavity and an open combined cavity. When two adjacent sections of the composite tube are butt-jointed, the two sections of the combined cavity are combined to form a combined space. The filling and pumping mechanism comprises a sampling tube, an air blowing tube, a water pumping mechanism and an air supply mechanism. The water pumping mechanism and the air supply mechanism are respectively installed inside the front and rear ends of the frame. The inner end of the sampling tube is located in the central tube, and the outer end is led out from the upper part of the sampling component and connected to the water outlet of the water pumping mechanism. The air blowing tube is sleeved in the central tube, and the outer end of the air blowing tube is led out from the upper part of the sampling component and connected to the air blowing port of the air supply mechanism. A water pumping port is installed on the outer wall of the composite tube, and the inner end of the water pumping port is connected to the sampling tube. An air bag is sleeved in the combined space, and an air nozzle is installed at the bottom of the combined space. The air port at the bottom of the air bag is connected to the air nozzle, and the inner end of the air nozzle is connected to the inner cavity of the air blowing tube.

[0008] Preferably, an external spring is sleeved between the end of the uppermost composite pipe and the connecting seat.

[0009] Preferably, a flexible gasket is installed at the port position of the combination space.

[0010] Preferably, a spring tube is connected to the middle of the air blast tube to keep the air blast tube as a whole contractible.

[0011] Preferably, a longitudinal hollow area is provided in the middle of the frame, in which a drill avoidance mechanism is installed, the drill avoidance mechanism comprises an inner frame and a longitudinal movement mechanism, the bottom of the inner frame is provided with a bottom plate, a perforated area is provided in the middle of the bottom plate, the bottom of the bottom plate is installed together with the hollow area of ​​the frame through the longitudinal movement mechanism, so that the inner frame can slide longitudinally; a drill assembly is installed in the drill avoidance mechanism.

[0012] Preferably, the drilling rig assembly includes a drilling rig, a rotating motor is installed on the upper part of the drilling rig, a shaft frame is fixed on the front side of the rotating motor, and a drill rod clamp is installed in the shaft frame through a bearing; a gear box is installed in the inner cavity of the drilling rig, the rotating shaft of the rotating motor is connected to the input end of the gear box, and the end of the output shaft of the gear box is connected to the drill rod clamp through a pulley; a rotary joint is installed on the top of the drilling rig, a water supply pipe is installed on the top of the rotary joint, and the water supply pipe is connected to the output end of the water supply mechanism; a drill rod is installed in the drill rod clamp, and a drill bit is installed at the lower end of the drill rod.

[0013] Preferably, a sampling avoidance mechanism is installed in the middle of the frame and below the drilling rig avoidance mechanism, the sampling avoidance mechanism includes a track frame and a guide seat, a cross rail is fixed at the bottom of the frame, a dovetail slider is arranged at the bottom of the track frame, the dovetail slider is matched with the cross rail, rollers are installed on the left and right sides of the track frame, the rollers can be supported on the ground and walk along the ground, a transverse motor is installed in the track frame, the output shaft of the transverse motor is transmission-connected with the rotating shaft of the roller; a guide seat is arranged in the middle of the track frame, a guide tube is fixed to the lower end hole of the guide seat, and the sampling assembly is sleeved in the guide seat and the guide tube.

[0014] Preferably, each layer of sampled water is stored in the sealed cavity of each composite tube. When the sampling assembly is removed from the borehole as a whole, each composite tube is removed section by section and marked respectively. At this time, the water stored in each composite tube is the sampled water.

[0015] Preferably, a slow-release mechanism is also included, which includes an annular inner plug, an inner spring and a connecting tube. The annular inner plug is inserted into the sealing cavity, and the annular inner plug divides the sealing cavity into a water cavity and an air cavity. The inner spring is located in the water cavity and supported on the side wall of the annular inner plug. The connecting tube is located in the end wall of the air cavity and is connected to the airbag.

[0016] Preferably, the air nozzle is a retractable self-sealing valve.

[0017] The beneficial effects of the present invention are as follows: Through optimized design and technological innovation, the device provides an efficient, stable and highly automated groundwater stratified sampling scheme, which significantly improves the efficiency of the sampling process and the accuracy of the samples.

[0018] 1. Accurate drilling and sampling: The combination of the drill rig avoidance mechanism and the drill rig components ensures the stability and efficiency of the drilling process, and enables accurate drilling operations at different depths.

[0019] 2. Automated sampling process: The sampling avoidance mechanism and lifting mechanism enable the sampling assembly to be accurately aligned with the drilling position and automatically perform lifting operations, thereby improving the degree of automation of the sampling process.

[0020] 3. Independent collection of multi-layer water samples: The sealed cavity and combined cavity formed by the composite tube design ensure that water samples at different depths can be collected independently, avoiding cross contamination between samples.

[0021] 4. Efficient inflation and pumping system: The inflation and pumping mechanism realizes the inflation and pumping functions of the multi-layer airbag through the sampling tube and the air inflation tube, ensuring the efficiency and accuracy of water sample collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the implementation process of the present invention;

[0023] Figure 2 yes Figure 1 Front view of the middle vehicle body;

[0024] Figure 3 yes Figure 2 Schematic diagram of the mechanism of the middle drilling rig assembly;

[0025] Figure 4 It is a schematic diagram of the assembly relationship between the avoidance mechanism and the sampling component;

[0026] Figure 5 It is a schematic diagram of the appearance structure of the sampling component;

[0027] Figure 6 yes Figure 5 The cross-sectional structure diagram of the middle part I;

[0028] Figure 7 yes Figure 5 Schematic diagram of the cross-sectional structure of the middle J part;

[0029] Figure 8 It is a schematic diagram of the airbag inflation state;

[0030] Fig. 9 yes Figure 1 Schematic diagram of the bottom structure;

[0031] Fig.10 It is a schematic diagram of the assembly relationship of the slow-release mechanism;

[0032] Fig.11 is with Fig.10 A schematic diagram of a self-closing valve structure.

[0033] Numbers in the figure: vehicle body 1; lifting mechanism 2; drilling rig avoidance mechanism 3; drilling rig assembly 4; sampling avoidance mechanism 5; sampling assembly 6; charging and pumping mechanism 7; slow-release mechanism 8; self-sealing valve 9; frame 11; steering wheel 12; walking wheel 13; shell 14; walking drive mechanism 15; bracket 21; wheel seat 22; rope pulley mechanism 23; lifting rope 24; bracket holder 25; inner frame 31; bottom plate 32; longitudinal movement mechanism 33; perforation area 34; drilling rig 41; rotating motor 42; drill rod clamp 43; drill rod 44; drill bit 45; rotary joint 46; water supply pipe 47; track frame 51; cross rail 52; roller 53; guide Seat 54; guide tube 55; transverse motor 56; buffer seat 57; center tube 61; composite inner tube 62; composite outer tube 63; sealing chamber 64; combined chamber 65; flexible gasket 66; fixing hole 67; strip hole 68; outer spring 69; sampling tube 71; water suction port 72; air inflation tube 73; air nozzle 74; air bag 75; spring tube 76; water suction mechanism 77; air supply mechanism 78; annular inner plug 81; inner spring 82; connecting tube 83; outer tube 91; inner fixed seat 92; outer fixed seat 93; piston 94; telescopic tube 95; core tube 96; constant pressure valve 97; side air hole 1 98; side air hole 2 99. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0035] Embodiment 1: A groundwater stratified sampling device, such as Figure 1 and Fig. 9 As shown, it mainly includes a vehicle body 1, a hoisting mechanism 2, a drilling rig avoidance mechanism 3, a drilling rig component 4, a sampling component 6 and a charging and pumping mechanism 7. Figure 1 and Fig. 9 As shown, the vehicle body 1 includes a frame 11, a steering wheel 12, a running wheel 13, a shell 14 and a running drive mechanism 15. The steering wheel 12 is installed at the front bottom of the frame 11, the running wheel 13 is installed at the rear bottom, and the running drive mechanism 15 is installed at the rear side of the bottom of the frame 11. The running drive mechanism 15 is used to drive the running wheel 13 to rotate. A hoisting mechanism 2 is installed on the top of the frame 11, and a shell 14 is fixed on the outside of the entire frame 11.

[0036] like Figure 1As shown, the hoisting mechanism 2 includes a bracket 21, a wheel seat 22, a rope pulley mechanism 23, a hoisting rope 24 and a bracket holder 25. The bracket holder 25 is fixed to the bottom of the bracket 21, and the bracket holder 25 is fixed to the assembly groove at the upper center of the frame 11. The upper part of the bracket 21 is fixed to the wheel seat 22, and the rope pulley mechanism 23 is installed on the wheel seat 22 through a bearing. The rope pulley mechanism 23 can be driven by a motor or a hand wheel to rotate or lock. The rope pulley mechanism 24 is wound around the rope pulley mechanism 23, and the lower end of the rope pulley 24 is hoisted with a sampling assembly 6, and the sampling assembly 6 can be removed or assembled from the rope pulley 24 at any time.

[0037] like Figure 1 and Figure 2 As shown, a longitudinal hollow area is provided in the middle of the vehicle frame 11, in which a drilling rig avoidance mechanism 3 is installed. The drilling rig avoidance mechanism 3 includes an inner frame 31, a bottom plate 32 and a longitudinal movement mechanism 33. The inner frame 31 is a rectangular frame body, and a bottom plate 32 is provided at the bottom of the inner frame 31, and a rectangular perforated area 34 is provided in the middle of the bottom plate 32. The bottom of the bottom plate 32 is installed together with the hollow area of ​​the vehicle frame 11 through the longitudinal movement mechanism 33, so that the inner frame 31 can slide in the longitudinal direction.

[0038] like Figure 2-4 As shown, a drilling assembly 4 is installed in the drilling rig avoidance mechanism 3. The drilling assembly 4 includes a drilling rig 41, a rotary motor 42, a drill rod clamp 43, a drill rod 44, a drill bit 45, a rotary joint 46 and a water supply pipe 47. A rotary motor 42 is installed on the upper part of the drilling rig 41, and a shaft frame is fixed on the front side of the rotary motor 42. The drill rod clamp 43 is installed in the shaft frame through a bearing. A gear box is installed in the inner cavity of the drilling rig 41, and the rotating shaft of the rotary motor 42 is connected to the input end of the gear box. The end of the output shaft of the gear box is connected to the drill rod clamp 43 through a pulley. A rotary joint 46 is installed on the top of the drilling rig 41, and a water supply pipe 47 is installed on the top of the rotary joint 46. The water supply pipe 47 is connected to the output end of the water supply mechanism. A drill rod 44 is installed in the drill rod clamp 43, and a drill bit 45 is installed at the lower end of the drill rod 44.

[0039] A sampling avoidance mechanism 5 is installed in the middle of the vehicle frame 11 and below the drilling rig avoidance mechanism 3. The sampling avoidance mechanism 5 includes a track frame 51, a cross rail 52, a roller 53, a guide seat 54, a guide tube 55 and a traverse motor 56. A cross rail 52 is fixed at the bottom of the vehicle frame 11, and a dovetail slider is arranged at the bottom of the track frame 51. The dovetail slider is matched with the cross rail 52, so that the track frame 51 can slide in the lateral direction. Rollers 53 are installed on the left and right sides of the track frame 51, and the rollers 53 can be supported on the ground and walk along the ground. A traverse motor 56 is installed in the track frame 51, and the output shaft of the traverse motor 56 is connected to the rotating shaft of the roller 53. A guide seat 54 is arranged in the middle of the track frame 51, and a guide tube 55 is fixed to the lower end opening of the guide seat 54. The sampling assembly 6 is sleeved in the guide seat 54 and the guide tube 55. A buffer seat 57 is fixed on one side of the track frame 51 so as to provide a buffering effect when the sampling avoidance mechanism 5 returns.

[0040] like Figure 5 As shown, the sampling assembly 6 includes a central tube 61, a composite inner tube 62, a composite outer tube 63, a sealing cavity 64, a combined cavity 65 and a flexible gasket 66. A connecting seat is fixed on the top of the central tube 61, and a hanging buckle is installed on the connecting seat, and the hanging buckle is connected to the end of the hanging rope 24. A guide head is threadedly installed at the bottom of the central tube 61, and multiple sections of composite tubes are sequentially installed from top to bottom between the upper connecting seat and the lower guide head, and on the outside of the central tube 61. An outer spring 69 is installed between the end of the composite tube at the top and the connecting seat.

[0041] like Figure 5 and Figure 7 As shown, the inner side of each section of composite pipe A, B, C, and D is a composite inner pipe 62, and the outer side is a composite outer pipe 63. The composite inner pipe 62 and the composite outer pipe 63 are fixed as a whole through a plurality of annular partitions. There is a closed sealing cavity 64 (the area between adjacent partitions) and an open combination cavity 65 between the composite inner pipe 62 and the composite outer pipe 63. When two adjacent sections of composite pipe are butt-jointed, the two sections of the combination cavity 65 are combined to form a combination space, and a flexible gasket 66 is installed at the port position of the combination space.

[0042] like Figure 6 and Figure 7 As shown, the charging and pumping mechanism 7 includes a sampling tube 71, a water pumping port 72, an air blowing tube 73, an air nozzle 74, an air bag 75, a spring tube 76, a water pumping mechanism 77 and an air supply mechanism 78. The water pumping mechanism 77 and the air supply mechanism 78 are installed inside the front and rear ends of the frame 11 respectively. Figure 1As shown, the inner end of the sampling tube 71 is located in the central tube 61, and the outer end is led out from the upper part of the sampling assembly 6 and connected to the water outlet of the pumping mechanism 77 (the excess part of the sampling tube 71 is hidden in the frame 11, or wound on the auxiliary tube wheel at the end of the pulley mechanism 23). The air blast pipe 73 is sleeved in the central tube 61, and the outer end of the air blast pipe 73 is led out from the upper part of the sampling assembly 6 and connected to the air blast port of the air supply mechanism 78 (the excess part of the air blast pipe 73 is hidden in the frame 11, or wound on the auxiliary tube wheel at the end of the pulley mechanism 23). An air bag 75 is sleeved in the combined space, and an air nozzle 74 is installed at the bottom of the combined space. The air port at the bottom of the air bag 75 is connected to the air nozzle 74, and the inner end of the air nozzle 74 is connected to the inner cavity of the air blast pipe 73. Thus, the air blast tube 73 is a common air tube, which simultaneously connects multiple air bags 75 in series, and the sampling tube 71 is a plurality of parallel water pipes, and the end of each sampling tube 71 is independently connected to a corresponding water extraction port 72. In addition, a spring tube 76 can be connected to the middle of the air blast tube 73 to keep the air blast tube 73 contractible as a whole. The sampling tube 71 is a flexible tube, and a fixing hole 67 is provided on the composite outer tube, and a corresponding strip hole 68 is provided on the composite inner tube, so that the sampling tube 71 can be pulled out from the fixing hole 67 and the strip hole 68 or the strip hole 68 can slide. The connection between the sampling tube 71 and the water extraction port 72 can be automatically docked by a magnetic attraction component 79.

[0043] Based on the above scheme, when in use, first, move the vehicle body 1 to the ground above the sampling position, drive the mobile drill avoidance mechanism 3 to move longitudinally, carry the drill assembly 4 to move to the position where the hole needs to be drilled, and then start the drill assembly 4 to start drilling. During the drilling process, when the length of the drill rod 44 is insufficient, additional drill rods 44 are continuously added to achieve the purpose of extending the drilling depth. After the drilling is completed, remove each section of the drill rod 44, and move the drill avoidance mechanism 3 to the initial position in the return direction, so that the entire drill assembly 4 is moved out of the drilling position by using the drill avoidance mechanism 3. Then, assemble the sampling assembly 6 into the sampling avoidance mechanism 5, and then hoist the sampling assembly 6 at the lower end of the suspension rope 24. Control the sampling avoidance mechanism 5 to move horizontally toward the front side, so that the sampling assembly 6 is located above the borehole. By controlling the hoisting mechanism 2, the sampling assembly 6 moves downward as a whole into the borehole. When the sampling assembly 6 moves down to the bottom of the borehole, the air supply mechanism 78 is controlled to inflate the multiple airbags 75 through the air blowing pipe 73, so that the multiple airbags 75 expand after being inflated. After each airbag 75 expands, it can cause the multiple composite tubes to move upward layer by layer (resisting the elastic force of the external spring 69). When each airbag 75 is drawn out from the combination chamber 65, as shown in FIG. Figure 8As shown, under the action of the outer spring 69, the multiple composite tubes are squeezed toward each other, so that the multiple air bags 75 are exposed outside the composite outer tube 63, thereby forming a closed sampling area in the area between adjacent air bags 75. Then, by controlling the pumping mechanism 77, the closed sampling area is pumped and sampled through the sampling tube 71. During the pumping and sampling process, the mixed water in the early stage of sampling needs to be removed first, and the last sampled water seat sample is retained for storage.

[0044] The above scheme uses the sampling tube 71 to extract water from the corresponding closed area for sampling. The filling and pumping mechanism 7 is used to lead the sampled water out of the ground and respectively install it in different sampling bottles for storage (the outer end of each sampling tube 71 is respectively installed with an independent water pump, or there is only one main water pump, and the outer end of each sampling tube 71 is respectively connected to the water suction port of the main water pump through a flexible joint according to the sampling sequence). Alternatively, each sampled water is stored in the sealed cavity 64 of each composite tube. When the sampling assembly 6 is removed from the borehole as a whole, each composite tube is dismantled section by section and marked respectively. At this time, the water stored in each composite tube is the sampled water. This process still needs to remove the previous mixed water first. The process of removing the mixed water can be adopted as follows. Fig.10 A mode of slow-release mechanism 8 is shown, and slow-release mechanism 8 comprises an annular inner plug 81, an inner spring 82 and a connecting pipe 83. The annular inner plug 81 is sleeved in the sealing cavity 64, and the annular inner plug 81 divides the sealing cavity 64 into a water cavity and an air cavity. The inner spring 82 is located in the water cavity and supported between the annular inner plug 81 and the inner wall of the sealing cavity 64. The connecting pipe 83 is located in the end wall of the air cavity and connected to the airbag 75. The lower end of the sampling tube 71 is connected to the inner wall of the sealing cavity 64, and the water extraction port 72 is installed on the outer wall of the sealing cavity 64. When the sampling tube 71 is pumped with water by the pumping mechanism 77, the water stored in the closed area (between adjacent airbags 75) first enters the sealing cavity 64 through the water extraction port 72, and then is discharged from the sealing cavity 64 to the outside of the ground through the sampling tube 71. When the amount of water in the closed area decreases, the area will be in a negative pressure state. Under the negative pressure state, the annular inner plug 81 will overcome the elastic force of the inner spring 82 and move downward. When the sampling tube 71 stops pumping water, the annular inner plug 81 will gradually move upward under the reset action of the inner spring 82, and then the water seeping out of the closed area will be drawn into the corresponding sealed cavity 64 through the water extraction port 72. After the entire sampling assembly 6 is lifted and the drilling is removed, each composite tube is removed section by section and marked separately, and the entire composite tube is used as a storage unit for sample water. Sample integrity guarantee: The slow release mechanism ensures the effective removal of mixed water, maintains the integrity and accuracy of the sample, and provides high-quality water sample data.

[0045] Based on the above solution, in order to ensure that each composite tube can be smoothly taken out from the outside of the central tube 61, the air nozzle 74 needs to be designed as a telescopic structure. One implementation method is as follows: Fig.11As shown in the figure, the self-sealing valve 9 includes an outer tube 91, an inner fixed seat 92, an outer fixed seat 93, a piston 94, a telescopic tube 95, a core tube 96, a constant pressure valve 97, a side air hole 1 98 and a side air hole 2 99. The inner end of the outer tube 91 is fixed with an inner fixed seat 92, and the outer end is fixed with an outer fixed seat 93. The inner fixed seat 92 is fixed together with the air blast tube 73, and the outer fixed seat 93 is fixed together with the composite inner tube 62. A piston 94 is matched and set in the outer tube 91, and the piston 94 divides the chamber of the outer tube 91 into an inner cavity and an outer cavity. A telescopic tube 95 is fixed on the outer end wall of the piston 94 (i.e., in the outer cavity). The telescopic tube 95 is a hollow structure, and its front end is a conical convex head. The position of the air nozzle on the inner wall of the airbag 75 is a conical groove. When the telescopic tube 95 is extended, the conical convex head and the conical groove can be sealed and docked. A side hole is provided on the side wall of the outer cavity of the outer tube 91 and a constant pressure valve 97 is installed. A core tube 96 is installed at the center of the inner fixed seat 92. The core tube 96 is connected to the inner cavity of the air blowing tube 73. On the side wall of the core tube 96, a side air hole 1 98 is arranged at the outer position, and a side air hole 2 99 is arranged at the inner position. A partition is arranged in the inner cavity of the core tube 96 and between the side air hole 1 98 and the side air hole 2 99. When the telescopic tube 95 is in a contracted state, the side air hole 1 98 is located in the inner cavity of the telescopic tube 95, and the side air hole 2 99 is located outside the inner cavity of the telescopic tube 95. When the air blowing tube 73 is blown through the side air hole 1 98, the air flow is exhausted from the side air hole 2 99 of the core tube 96 to the inner cavity of the outer tube 91, and the air pressure in the inner cavity of the outer tube 91 increases. During the pressurization process, when the pressure reaches the rated value, the constant pressure valve 97 starts to exhaust. The piston 94 is prompted to move toward the outer end, and then the telescopic tube 95 moves forward to dock with the entrance of the airbag 75. At the same time, the side air hole 1 98 is exposed in the inner cavity. At this time, the gas entering from the core tube 96 will be discharged from the side air hole 2 99 at the same time and then enter the telescopic tube 95 through the side air hole 1 98, and finally enter the airbag 75. When the airbag 75 needs to be exhausted, the side air hole 1 98 provides a negative pressure suction function, and the airbag 75 is evacuated through the air blast tube 73 and the telescopic tube 95, so that the airbag 75 is in a contracted state. During the air extraction process, when the negative pressure reaches the rated value, the constant pressure valve 97 starts to take in air, so that the telescopic tube 95 begins to shrink. Thus, by controlling the side air hole 1 98 to perform positive pressure blowing or negative pressure suction, the extension and retraction of the self-sealing valve 9 can be realized, and the airbag 75 can be inflated after extension, and the airbag 75 can be evacuated before retraction. The telescopic structure of the self-sealing valve realizes automatic inflation and exhaust control of the airbag through positive pressure blowing and negative pressure suction of the side air hole, thereby improving the accuracy and convenience of the sampling process.

[0046] Based on the above scheme, the specific implementation steps of the groundwater stratified sampling device when in use are as follows.

[0047] (1) Device movement and positioning: Move the vehicle body 1 to the location where sampling is required. Use the steering wheels 12 and the travel wheels 13 to flexibly adjust the position of the vehicle body to ensure that the device is located just above the target sampling point. The travel drive mechanism 15 drives the travel wheels 13 to ensure that the device is stably parked on the ground.

[0048] (2) Drilling preparation: Start the drilling machine avoidance mechanism 3, and slide the inner frame 31 longitudinally through the longitudinal movement mechanism 33 to move the drilling machine assembly 4 to the position directly above the drilling position. The smooth sliding of the longitudinal movement mechanism 33 ensures the accurate positioning of the drilling position.

[0049] (3) Drilling operation: Start the drilling assembly 4, and the rotating motor 42 drives the drill rod 44 and the drill bit 45 to start drilling. When the drill rod 44 is not long enough, additional drill rods 44 are gradually added to ensure that the drilling depth reaches the expected depth. During the drilling process, the design of the drill rod clamp 43 and the rotary joint 46 ensures the stability of the drill rod and the accuracy of the drilling.

[0050] (4) Drill avoidance: After drilling is completed, the drill rod sections 44 are removed, and the drill avoidance mechanism 3 is moved to the initial position in the return direction. The longitudinal movement mechanism 33 is used to move the drill assembly 4 out of the drilling position to make room for the operation of the sampling assembly.

[0051] (5) Sampling assembly preparation: The sampling assembly 6 is installed in the sampling avoidance mechanism 5, and the sampling assembly 6 is hoisted to the lower end of the hoisting rope 24 by the hoisting mechanism 2. The modular design of the sampling assembly 6 facilitates installation and disassembly, thereby improving the convenience of operation.

[0052] (6) Sampling position adjustment: The sampling avoidance mechanism 5 is controlled, and the traverse motor 56 drives the track frame 51 to move in the lateral direction, so that the sampling assembly 6 is located just above the drill hole. The design of the traverse rail 52 and the roller 53 ensures the smooth movement of the sampling assembly.

[0053] (7) Sampling process: The hoisting mechanism 2 controls the sampling assembly 6 to slowly descend into the borehole to ensure that the sampling assembly safely reaches the bottom of the borehole. The air supply mechanism 78 is controlled to inflate multiple air bags 75 through the air pipe 73 to expand the air bags and seal the sampling area. The expansion of the air bags 75 and the action of the external spring 69 ensure the proper movement of the composite tube and the formation of the sealing area.

[0054] (8) Pumping and sampling: Start the pumping mechanism 77, pump water from the closed sampling area through the sampling tube 71, and collect groundwater samples. After the initial extraction of mixed water, retain the final sample water and store it in the corresponding sampling bottle. The design of the sampling tube 71 and the pumping port 72 ensures the independent collection of water samples and the integrity of the samples.

[0055] (9) Sampling assembly removed from the borehole: After sampling is completed, the sampling assembly 6 is slowly lifted out of the borehole by the lifting mechanism 2 and safely removed. The modular design facilitates the removal of each composite pipe section by section and the marking of water storage.

[0056] (10) Sample storage and labeling: Collected water samples are stored in sampling bottles or in each composite tube to ensure the integrity and accuracy of the samples. Labeling is used to ensure the identification and management of the water stored in each composite tube.

[0057] The above steps ensure the high efficiency, stability and sample accuracy of the groundwater stratified sampling device during the sampling process. The design and technical effects of each link complement each other and achieve high-quality collection of groundwater samples.

[0058] The above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modification, equivalent substitution, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention.

Claims

1. A groundwater stratified sampling device, comprising a vehicle body (1), a hoisting mechanism (2), a sampling assembly (6) and a charging and pumping mechanism (7), wherein the hoisting mechanism (2) is installed on the top of the vehicle frame (11), and the sampling assembly (6) is hoisted at the lower end of a hoisting rope (24) of the hoisting mechanism (2); characterized in that: The sampling assembly (6) comprises a central tube (61) and a composite tube. A connection seat is fixed on the top of the central tube (61), a hanging buckle is installed on the connection seat, and the hanging buckle is connected to the end of the hanging rope (24). A guide head is installed on the bottom thread of the central tube (61). A plurality of composite tubes are sequentially mounted on the outer side of the central tube (61) from top to bottom, and the plurality of composite tubes are located between the upper connection seat and the lower guide head. The inner side of each composite tube is a composite inner tube (62), and the outer side is a composite outer tube (63). The composite inner tube (62) and the composite outer tube (63) are fixed as a whole by a plurality of annular partitions. A closed sealing cavity (64) and an open sealing cavity (64) are provided between the composite inner tube (62) and the composite outer tube (63). The combined cavity (65) is configured such that when two adjacent sections of the composite tube are butt-jointed, the adjacent combined cavities (65) are combined to form a combined space; the charging and pumping mechanism (7) comprises a sampling tube (71), an air blowing tube (73), a water pumping mechanism (77) and an air supply mechanism (78); the water pumping mechanism (77) and the air supply mechanism (78) are respectively installed inside the front and rear ends of the vehicle frame (11); the inner end of the sampling tube (71) is located inside the central tube (61); the outer end of the sampling tube (71) is led out from the upper part of the sampling assembly (6) and connected to the water outlet of the water pumping mechanism (77); the air blowing tube (73) is sleeved inside the central tube (61); the outer end of the air blowing tube (73) is led out from the upper part of the sampling assembly (6) and connected to the water outlet of the water pumping mechanism (77); The composite tube (73) is connected to the air blast port (8); a water extraction port (72) is installed on the outer wall of the composite tube, and the inner end of the water extraction port (72) is connected to the sampling tube (71); an air bag (75) is installed in the combined space, and an air nozzle (74) is installed at the bottom of the combined space, the air port at the bottom of the air bag (75) is connected to the air nozzle (74), and the inner end of the air nozzle (74) is connected to the inner cavity of the air blast tube (73); and also includes a slow release mechanism (8), the slow release mechanism (8) includes an annular inner plug (81), an inner spring (82) and a connecting tube (83), the annular inner plug (81) is installed in the sealing cavity (64), the annular inner plug (81) divides the sealing cavity (64) into a water cavity and an air cavity, the inner spring (82) is located in the water cavity and supports The side wall of the annular inner plug (81) is supported, and the connecting pipe (83) is located in the end wall of the air cavity and connected to the air bag (75); the lower end of the sampling tube (71) is connected to the inner wall of the sealed cavity (64), and the water extraction port (72) is installed on the outer wall of the sealed cavity (64). When the sampling tube (71) is pumped with water by the pumping mechanism (77), the water stored in the closed area between the adjacent air bags (75) first enters the sealed cavity (64) through the water extraction port (72), and then is discharged from the sealed cavity (64) through the sampling tube (71) to the outside of the ground; when the amount of water in the closed area decreases, the area will be in a negative pressure state, and under the negative pressure state, the annular inner plug (81) will overcome the elastic force of the inner spring (82) and move downward;When the sampling tube (71) stops pumping water, the annular inner plug (81) will gradually move upward under the reset action of the inner spring (82), thereby pumping the water seeping out of the closed area into the corresponding sealed cavity (64) through the water pumping port (72); after the entire sampling assembly (6) is lifted and the drilling hole is removed, each composite tube is removed section by section and marked respectively, and the entire composite tube is used as a storage unit for sample water. ; 2. The groundwater stratified sampling device according to claim 1, characterized in that: An outer spring (69) is sleeved between the end of the uppermost composite pipe and the connecting seat.

3. The groundwater stratified sampling device according to claim 1, characterized in that: A flexible gasket (66) is installed at the port position of the combination space.

4. The groundwater stratified sampling device according to claim 1, characterized in that: A spring tube (76) is connected to the middle of the air blast tube (73), so that the air blast tube (73) as a whole has contractility.

5. The groundwater stratified sampling device according to claim 1, characterized in that: A longitudinal hollow area is provided in the middle of the vehicle frame (11), and a drilling rig avoidance mechanism (3) is installed in the hollow area. The drilling rig avoidance mechanism (3) comprises an inner frame (31) and a longitudinal movement mechanism (33). The bottom of the inner frame (31) has a bottom plate (32), and a perforated area (34) is provided in the middle of the bottom plate (32). The bottom of the bottom plate (32) is connected to the hollow area of ​​the vehicle frame (11) through the longitudinal movement mechanism (33), so that the inner frame (31) can slide in the longitudinal direction. A drilling rig assembly (4) is installed in the drilling rig avoidance mechanism (3).

6. The groundwater stratified sampling device according to claim 5, characterized in that: The drilling rig assembly (4) comprises a drilling rig (41), a rotating motor (42) is installed on the upper part of the drilling rig (41), a shaft frame is fixed on the front side of the rotating motor (42), and a drill rod clamp (43) is installed in the shaft frame via a bearing; a gear box is installed in the inner cavity of the drilling rig (41), the rotating shaft of the rotating motor (42) is connected to the input end of the gear box, and the end of the output shaft of the gear box is transmission-connected to the drill rod clamp (43) via a pulley; a rotating joint (46) is installed on the top of the drilling rig (41), a water supply pipe (47) is installed on the top of the rotating joint (46), and the water supply pipe (47) is connected to the output end of the water supply mechanism; a drill rod (44) is installed in the drill rod clamp (43), and a drill bit (45) is installed at the lower end of the drill rod (44).

7. The groundwater stratified sampling device according to claim 5, characterized in that: A sampling avoidance mechanism (5) is installed in the middle of the vehicle frame (11) and below the drilling rig avoidance mechanism (3). The sampling avoidance mechanism (5) comprises a track frame (51) and a guide seat (54). A cross rail (52) is fixed at the bottom of the vehicle frame (11). A dovetail slider is arranged at the bottom of the track frame (51). The dovetail slider is matched with the cross rail (52). Rollers (53) are installed on the left and right sides of the track frame (51). The rollers (53) can be supported on the ground and move along the ground. A traverse motor (56) is installed in the track frame (51). The output shaft of the traverse motor (56) is connected to the rotating shaft of the roller (53) in a transmission manner. A guide seat (54) is arranged in the middle of the track frame (51). The guide seat (54) is provided with a guide hole. A guide tube (55) is fixed at the lower end of the guide hole. The sampling assembly (6) is sleeved in the guide seat (54) and the guide tube (55).

8. The groundwater stratified sampling device according to claim 1, characterized in that: The sampled water of each layer is stored in the sealed cavity (64) of the corresponding composite tube. When the sampling assembly (6) is removed from the borehole as a whole, the composite tubes are removed section by section and marked respectively. At this time, the water stored in each composite tube is the sampled water.

9. The groundwater stratified sampling device according to claim 1, characterized in that: The air nozzle (74) is a retractable self-sealing valve.

Images