A stratified groundwater sampling apparatus

Abstract

The application discloses a layered underground water sampling device. The technical problem to be solved is that the existing device has poor filtering and anti-blocking effect, and the sampled sample is easily disturbed, which affects the sample representativeness and analysis and detection result. The technical implementation scheme of the application is that the layered underground water sampling device comprises a protective shell and a weight block, etc. Two front and rear symmetrical weight blocks are installed on the outer surface of the protective shell. The application realizes the insulation of the inside and outside of the device by the insulation board, prevents the water sample temperature in the device from being affected, and further affects the sampling accuracy. In order to ensure the stability of the device during sampling, the arc-shaped weight block is arranged on the outer surface of the protective shell. The weight block prevents the device from being impacted by the underground water, so that the swing range of the device is not too large, the wear of the external rope is not serious, and the wear degree of the external rope is effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of groundwater, in particular to a layered groundwater sampling device. BACKGROUND

[0002] Groundwater resources are an important strategic resource to support the sustainable development of economy and society, and groundwater pollution prevention is an important part of China's water environment protection and drinking water safety guarantee system. In recent years, with the rapid development of China's economy and society, the pressure on the groundwater environment has gradually increased, and regional groundwater pollution problems have become increasingly prominent. In some areas, groundwater pollution problems are very serious, and the safety of some groundwater drinking water sources cannot be guaranteed. Due to the complexity of the hydrogeological conditions of groundwater, the investigation and sampling of groundwater is difficult, especially in the case of multi-layered groundwater or NAPL phase pollutants, layered sampling is necessary. Therefore, the detection of groundwater changes is conducive to timely governance and remediation, and prevents further pollution of pollutants.

[0003] When sampling groundwater, in order to detect the specific conditions of groundwater at different depths, layered sampling is required. A groundwater layered sampler with application number 202110282434.5 is proposed, which starts the servo motor to lower the sampling box. In this process, the push rod also pushes the positioning rod down along the inner side wall of the leg while rotating and moving down. When the positioning rod reaches the specified position, the outer side wall of the gear cannot engage with the outer side wall of the push rod due to the setting of the buffer spring, preventing damage to the gear when the sampling box is lowered. During the lowering of the sampling box, the bristles clean the outer side wall of the sampling box to ensure the cleanliness of the outer surface of the sampling box and prevent dust adhering to the outer side wall of the sampling box from polluting the groundwater, affecting personnel use, ensuring personnel health and safety, and improving the stability of the device when sampling groundwater. The device proposes protection of the gear and self-dust prevention, but during sampling, groundwater pressure is used for sampling, and after sampling, the filter screen is knocked and cleaned by the spring to prevent clogging, but the cleaning effect is poor, and when sampling groundwater at different depths, the device cannot ensure that the sampled samples will not be mixed, affecting the detection results. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a layered groundwater sampling device with good filtering and anti-clogging effect, without mixing of the sampled samples, and high sampling purity.

[0005] In order to achieve the above object, the present application is realized by the following technical scheme: A layered underground water sampling device, comprising a protective shell, a weight block, a connecting frame, a sling and a screw cap; two front and rear symmetrical weight blocks are installed on the outer surface of the protective shell; the connecting frame is installed on the upper side of the protective shell; the sling is connected to the connecting frame; the screw cap is movably connected to the upper side of the protective shell; further comprising a layered sampling assembly and a conversion assembly; the layered sampling assembly for layered sampling of underground water is installed on the inner side of the protective shell; the conversion assembly for conversion and collection of different sampling water to prevent mixing is installed on the inner side of the protective shell; the conversion assembly contacts the lower surface of the screw cap.

[0006] As a further preferred scheme, the weight block is provided in an arc shape.

[0007] As a further preferred scheme, the layered sampling assembly comprises a heat preservation plate, a water inlet pipe, a connecting pipe, filter cotton, a spray head, a baffle, a sealing ring, a connecting shaft, a first bevel gear, an air cylinder, a separation disc, a round rod, an elastic piece, an air pipe, a rack, a first flat gear and a second bevel gear; the heat preservation plate is fixedly connected to the inner side of the protective shell; the water inlet pipe is installed on the protective shell and penetrates the heat preservation plate; the air cylinder is fixedly connected to the inner side of the heat preservation plate; the connecting pipe is in communication between the air cylinder and the water inlet pipe; the filter cotton is installed on the inner right side of the water inlet pipe; the spray head is installed on the inner right side of the water inlet pipe and is located to the left of the filter cotton; the baffle is installed on the inner right side of the water inlet pipe and is located to the left of the spray head; the sealing ring is installed on the inner right side of the water inlet pipe and is located to the outside of the baffle; the connecting shaft is fixedly connected to the baffle and is rotatably connected to the water inlet pipe; the first bevel gear is fixedly connected to the upper side of the connecting shaft; the elastic piece is fixedly connected to the inner side of the air cylinder; the round rod is slidably connected to the inner side of the air cylinder and is located to the outside of the elastic piece; the separation disc is fixedly connected to the lower end of the elastic piece; the separation disc is fixedly connected to the round rod; the air pipe is in communication with the upper side of the air cylinder; the rack is fixedly connected to the upper side of the round rod; the first flat gear is rotatably connected to the inner side of the protective shell through a connecting rod; the second bevel gear is rotatably connected to the inner side of the protective shell through a connecting rod; the second bevel gear is engaged with the first bevel gear.

[0008] As a further preferred scheme, the spray head is provided in a circular truncated cone shape and a plurality of through holes are formed in the right side thereof.

[0009] As a further preferred scheme, the separation disc divides the air cylinder into two spaces which are not in communication with each other.

[0010] As a further preferred scheme, the connecting pipe is in communication with the water inlet pipe at a position between the spray head and the baffle.

[0011] As a further preferred scheme, the conversion assembly comprises a fixed ring, a baffle disc, a servo motor, a second spur gear, a hollow rod, a third spur gear, a connecting disc, a sampling pipe, a collection pipe, a sample discharge pipe, a waste discharge pipe and a limiting disc; the middle part of the inner side of the heat preservation plate is fixedly connected with the fixed ring; the inner side of the fixed ring is fixedly connected with the baffle disc; the hollow rod is rotatably connected to the fixed ring; the servo motor is installed on the inner side of the heat preservation plate; the output shaft of the servo motor is fixedly connected with the second spur gear; the third spur gear is fixedly connected to the hollow rod; the third spur gear meshes with the second spur gear; the connecting disc is fixedly connected to the lower side of the hollow rod; three sampling pipes are fixedly connected to the lower surface of the connecting disc in a ring shape; three collection pipes are fixedly connected to the lower surface of the connecting disc in a ring shape; the limiting disc is fixedly connected to the upper part of the inner side of the heat preservation plate; one sample discharge pipe is arranged between the lower side of each of the three sampling pipes and the limiting disc; the waste discharge pipe is arranged at the center point of the three collection pipes; the three sample discharge pipes are in contact with the lower surface of the rotary cap and the waste discharge pipe.

[0012] As a further preferred scheme, the baffle disc is provided with a circular hole corresponding to the water inlet pipe.

[0013] As a further preferred scheme, the connecting disc is provided with a sampling water inlet and a waste water removal inlet.

[0014] As a further preferred scheme, the sample discharge pipes arranged below the connecting disc are in the form of flexible pipes.

[0015] The present application has the following advantages: the present application realizes the isolation of the inside and outside of the equipment by the heat preservation plate, prevents the water sample temperature inside the equipment from being affected, and further affects the sampling accuracy; in order to ensure the stability of the equipment during sampling, the arc-shaped weight blocks are arranged on the outer surface of the protective shell, which prevents the equipment from being impacted by the underground water and causing the equipment to swing too much and the external rope to be severely worn, and effectively reduces the wear degree of the external rope.

[0016] The baffle is rotated by 90 degrees through the connecting shaft, so that the underground water smoothly enters the sampling pipe through the water inlet pipe, the impurities in the underground water are filtered through the filter cotton, after the first depth sampling is completed, the baffle is reversed by 90 degrees to reset, so as to hinder the underground water from continuously entering the sampling pipe, and when the partition disc moves downward to reset, the water in the space below the air cylinder is pressed out, the water squeezed out passes through the spray head, the spray head is arranged in the form of a circular truncated cone and has a plurality of through holes on the right side, so that the water pressed out has a certain impact force after passing through the spray head, and further has a certain impact force on the filter cotton, so as to wash away the impurities adhered and filtered on the surface of the filter cotton, and prevent the filter cotton from being blocked.

[0017] The third bevel gear is driven by the second bevel gear to rotate counterclockwise by 60 degrees, so that the collecting tube is rotated to be directly below the water outlet of the water inlet pipe. When the device is lowered to the water depth for the second sampling, the lowering is stopped. The water for the second sampling is used to flush the water for the last sampling remaining in the water inlet pipe, and the flushing is collected through the collecting tube. The flushing water is treated as waste water. After flushing for one to two minutes, the servo motor is controlled to work again, so that the connecting disc is rotated by 60 degrees again, so that the other sampling tube is rotated to be directly below the water outlet of the water inlet pipe. Then, the second sampling is completed, the problem of mixing of the sampling water is prevented, and the purity of the sampling is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0018] These and other features of the present disclosure will become more apparent from a detailed consideration of the application when taken in conjunction with the drawings in which:

[0019] Figure 1 It is a first perspective view of the present application;

[0020] Figure 2 It is a second perspective view of the present application;

[0021] Figure 3 It is a sectional view of the present application;

[0022] Figure 4 It is a partial perspective view of the present application;

[0023] Figure 5 It is a first sectional view of the layered sampling assembly of the present application;

[0024] Figure 6 It is a second sectional view of the layered sampling assembly of the present application;

[0025] Figure 7 It is a sectional view of the conversion assembly of the present application;

[0026] Figure 8 It is a partial exploded view of the conversion assembly of the present application.

[0027] The figure label name: 1-protective shell, 2-weight block, 3-connection frame, 4-sling, 5-rotary cover, 201-thermal insulation board, 202-water inlet pipe, 203-connection pipe, 204-filter cotton, 205-jet head, 206-baffle, 207-sealing ring, 208-connection shaft, 209-first bevel gear, 2010-air cylinder, 2011-separation disc, 2012-round rod, 2013-elastic member, 2014-air pipe, 2015-rack, 2016-first spur gear, 2017-second bevel gear, 301-fixed ring, 302-baffle disc, 303-servo motor, 304-second spur gear, 305-hollow rod, 306-third spur gear, 307-connection disc, 308-sampling pipe, 309-collection pipe, 3010-sample discharge pipe, 3011-waste discharge pipe, 3012-limiting disc. DETAILED DESCRIPTION

[0028] The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0029] As Figures 1-8 shown, a layered underground water sampling device, comprising a protective shell 1, a weight block 2, a connection frame 3, a sling 4 and a rotary cover 5; the outer surface of the protective shell 1 is provided with two front and rear symmetrical weight blocks 2; the upper side of the protective shell 1 is provided with a connection frame 3; the connection frame 3 is connected with a sling 4; the upper side of the protective shell 1 is movably connected with a rotary cover 5.

[0030] Further comprising a layered sampling assembly and a conversion assembly; the layered sampling assembly is installed on the inner side of the protective shell 1; the conversion assembly is installed on the inner side of the protective shell 1; the conversion assembly contacts the lower surface of the rotary cover 5.

[0031] The weight block 2 is provided in an arc shape.

[0032] The layered sampling assembly comprises a heat preservation plate 201, a water inlet pipe 202, a connecting pipe 203, filter cotton 204, a spray head 205, a baffle 206, a sealing ring 207, a connecting shaft 208, a first bevel gear 209, an air cylinder 2010, a separation disc 2011, a round rod 2012, an elastic member 2013, an air pipe 2014, a rack 2015, a first flat gear 2016 and a second bevel gear 2017; the heat preservation plate 201 is fixedly connected to the inner side of the protective shell 1; the water inlet pipe 202 is mounted on the protective shell 1 and penetrates through the heat preservation plate 201; the air cylinder 2010 is fixedly connected to the upper inner side of the heat preservation plate 201; the connecting pipe 203 is in communication between the air cylinder 2010 and the water inlet pipe 202; the filter cotton 204 is mounted on the right inner side of the water inlet pipe 202; the spray head 205 is mounted on the right inner side of the water inlet pipe 202 and located to the left of the filter cotton 204; the baffle 206 is mounted on the right inner side of the water inlet pipe 202 and located to the left of the spray head 205; the sealing ring 207 is mounted on the right inner side of the water inlet pipe 202 and located to the outside of the baffle 206; the connecting shaft 208 is fixedly connected to the baffle 206 and rotationally connected with the water inlet pipe 202; the first bevel gear 209 is fixedly connected to the upper side of the connecting shaft 208; the elastic member 2013 is fixedly connected to the inner side of the air cylinder 2010; the round rod 2012 is slidingly connected to the inner side of the air cylinder 2010 and located to the outside of the elastic member 2013; the separation disc 2011 is fixedly connected to the lower end of the elastic member 2013; the separation disc 2011 is fixedly connected with the round rod 2012; the air pipe 2014 is in communication with the upper side of the air cylinder 2010; the rack 2015 is fixedly connected to the upper side of the round rod 2012; the first flat gear 2016 is rotationally connected to the inner side of the protective shell 1 through a connecting rod; the second bevel gear 2017 is rotationally connected to the inner side of the protective shell 1 through a connecting rod; the second bevel gear 2017 is engaged with the first bevel gear 209; the internal air pressure of the air cylinder 2010 is changed through the air pipe 2014, so that the baffle 206 is rotated, and then the sampling water is automatically entered under the action of water pressure, and sampling is completed.

[0033] The elastic member 2013 is a spring.

[0034] The spray head 205 is in the shape of a circular truncated cone and a plurality of through holes are formed in the right side thereof.

[0035] The separation disc 2011 divides the air cylinder 2010 into two spaces which are not communicated with each other.

[0036] The connecting pipe 203 is in communication with the water inlet pipe 202 between the spray head 205 and the baffle 206.

[0037] The conversion assembly comprises a fixed ring 301, a baffle disc 302, a servo motor 303, a second spur gear 304, a hollow rod 305, a third spur gear 306, a connecting disc 307, sampling pipes 308, collecting pipes 309, sample discharge pipes 3010, waste discharge pipes 3011 and a limiting disc 3012; the fixed ring 301 is fixedly connected to the middle part of the inner side of the heat preservation plate 201; the baffle disc 302 is fixedly connected to the inner side of the fixed ring 301; the hollow rod 305 is rotatably connected to the fixed ring 301; the servo motor 303 is installed on the inner side of the heat preservation plate 201; the second spur gear 304 is fixedly connected to the output shaft of the servo motor 303; the third spur gear 306 is fixedly connected to the hollow rod 305; the third spur gear 306 meshes with the second spur gear 304; the connecting disc 307 is fixedly connected to the lower side of the hollow rod 305; the three sampling pipes 308 are fixedly connected to the lower surface of the connecting disc 307; the three collecting pipes 309 are fixedly connected to the lower surface of the connecting disc 307; the limiting disc 3012 is fixedly connected to the upper part of the inner side of the heat preservation plate 201; one sample discharge pipe 3010 is arranged between the lower side of each of the three sampling pipes 308 and the limiting disc 3012; the waste discharge pipe 3011 is arranged at the center point of the three collecting pipes 309; the three sample discharge pipes 3010 are in contact with the waste discharge pipe 3011 and the lower surface of the screw cap 5; the relative positions of the connecting disc 307 and the water inlet pipe 202 are converted by the servo motor 303, so that different samples can be sampled and stored.

[0038] The baffle disc 302 is provided with a circular hole corresponding to the water inlet pipe 202.

[0039] The connecting disc 307 is provided with a sampling water inlet and a waste water removal inlet.

[0040] The pipe located below the connecting disc 307 is a flexible pipe.

[0041] When groundwater needs to be sampled, the hoisting rope 4 is connected to an external rope, and then the device is placed into the groundwater through the external rope, and the groundwater is sampled; when sampling, the water temperature of the sample also needs to be detected, therefore, the heat preservation plate 201 is used to isolate the inside and outside of the device, so as to prevent the water sample temperature inside the device from being affected, and thus the sampling accuracy is affected; at the same time, in order to ensure the stability of the device during sampling, the weight block 2 in the arc shape is arranged on the outer surface of the protective shell 1, so that the device is prevented from being subjected to a large impact of the groundwater, and thus the swing range of the device is too large, and the external rope is seriously worn.

[0042] At the same time, further processing is needed to solve the problem of impurities entering the sampling water during the sampling process, that is, the problems of filtering and anti-blocking exist, and at the same time, for the stratified sampling of groundwater, such as the sampling depth of the sampling water is not the same, in order to prevent the mixing between the sampling water at different depths, therefore, after each sampling is completed, the water remaining after the last sampling needs to be cleaned when preparing to sample the groundwater at another depth to solve the mixing problem.

[0043] Filtering and anti-blocking treatment: when the device is lowered to the designated sampling depth of underground water, the device stops descending, and due to the external water pressure, underground water automatically enters the water inlet pipe 202 and passes through the filter cotton 204 and the through hole of the spray head 205, at this time the water inlet pipe 202 is still blocked by the baffle 206 and the sealing ring 207, and underground water cannot enter the sampling pipe 308, at the same time, the air pipe 2014 is connected with the air pump, and then the pump is controlled to start working, the pump inhales the air inside the air cylinder 2010 through the air pipe 2014, since the air cylinder 2010 is divided into two spaces by the partition disc 2011, the upper space of the air cylinder 2010 is lowered in pressure, so that the underground water enters the lower space of the air cylinder 2010 through the connecting pipe 203, and at the same time, the partition disc 2011 drives the round rod 2012 to slide upwards and compresses the elastic member 2013, when the round rod 2012 moves upwards, the round rod 2012 drives the rack 2015 to move upwards at the same time, and the rack 2015 is engaged with the first spur gear 2016, and the first spur gear 2016 is driven to rotate by 90 degrees through the rack 2015, and then the second bevel gear 2017 is driven to rotate by 90 degrees through the first spur gear 2016, and then the first bevel gear 209 is driven to rotate by 90 degrees through the second bevel gear 2017, and then the connecting shaft 208 is driven to rotate by 90 degrees through the first bevel gear 209, so that the baffle 206 is driven to rotate by 90 degrees through the connecting shaft 208, so that the underground water smoothly enters the sampling pipe 308 through the water inlet pipe 202, and at the same time, the impurities in the underground water are filtered through the filter cotton 204, after the sampling of the first depth is completed, when the sampling of another depth is performed, the pump is controlled to inflate the upper space of the air cylinder 2010, so that the upper space is pressurized, and then the partition disc 2011 and the round rod 2012 move downwards and reset, when the round rod 2012 moves downwards, the round rod 2012 drives the rack 2015 to move downwards and reset, and then the first spur gear 2016 is driven to reverse by 90 degrees through the rack 2015, and then the baffle 206 is reversed by 90 degrees to reset, so as to prevent the underground water from continuing to enter the sampling pipe 308, and when the partition disc 2011 moves downwards to reset, the water in the lower space of the air cylinder 2010 is pressed out and discharged from the water inlet pipe 202 through the connecting pipe 203, and when the discharged water passes through the spray head 205, since the spray head 205 is provided in the shape of a circular table and a plurality of through holes are formed on the right side, the discharged water passes through the through holes of the spray head 205, so as to generate a certain impact force on the filter cotton 204, so as to wash away the impurities adhered and filtered on the surface of the filter cotton 204, and prevent the filter cotton 204 from being blocked.

[0044] Layered sampling, prevent mixing: when the first sampling is completed, continue to make the device down, while the control servo motor 303 starts to work, servo motor 303 uses battery independent power supply, as a reference from top to bottom, through the servo motor 303 drive the second flat gear 304 clockwise rotation sixty degrees, then through the second flat gear 304 drive the third flat gear 306 counterclockwise rotation sixty degrees, so that the collection tube 309 is rotated to the water outlet of the water inlet pipe 202 directly below, when the device is lowered to the second sampling water depth, stop descending, because after the last sampling, the water inlet pipe 202 will inevitably remain the first sampling water, in order to ensure the purity of the sampling in the second sampling, start sampling, control the pump to work again, so that the partition plate 2011 moves upward again, so that the baffle 206 rotates ninety degrees again, so that the second sampling water enters the water inlet pipe 202, and the water inlet pipe 202 is washed by the second sampling water, and is collected by the collection tube 309, when the waste water is treated, after one to two minutes of flushing, control the servo motor 303 to work again, so that the connecting disc 307 rotates sixty degrees again, so that another sampling tube 308 is rotated to the water outlet of the water inlet pipe 202 directly below, then complete the second sampling, during the rotation of the connecting disc 307, there is a small amount of water flowing out of the water inlet pipe 202 adhering to the upper surface of the connecting disc 307, in order to prevent the mixing of different sampling water into different sampling tubes 308, the water adhering to the upper surface of the connecting disc 307 is scraped off by the baffle 302, so that the sampling water adhering to the surface of the connecting disc 307 is cleaned in turn when the connecting disc 307 rotates, thereby preventing the mixing of sampling water and ensuring the purity of sampling.

[0045] When the layered sampling is completed, the device is lifted back to the ground, then the device is taken off from the external rope, and then the rotary cover 5 is manually unscrewed, the sampling tube 308 and the exhaust pipe 3011 are connected to the pipeline, the sampling water is taken out, and at the same time, because the exhaust pipe 3011 is in communication with the collection tube 309, the waste water is discharged from the exhaust pipe 3011.

[0046] Although the embodiments of the present application have been shown and described, it is understood by those skilled in the art that changes can be made in the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A stratified groundwater sampling device, comprising a protective shell (1), weight blocks (2), a connecting frame (3), a sling (4), and a cap (5); two symmetrical weight blocks (2) are installed on the outer surface of the protective shell (1); a connecting frame (3) is installed on the upper side of the protective shell (1); and a sling (4) is connected to the connecting frame (3); The protective outer shell (1) has a movably connected cap (5) on its upper side; Its characteristics are: It also includes a stratified sampling component and a conversion component; the inner side of the protective housing (1) is equipped with a stratified sampling component for stratified sampling of groundwater; the inner side of the protective housing (1) is equipped with a conversion component for converting and collecting different sampled waters to prevent mixing; the conversion component contacts the lower surface of the screw cap (5); The stratified sampling assembly includes an insulation board (201), a water inlet pipe (202), a connecting pipe (203), a filter cotton (204), a spray head (205), a baffle (206), a sealing ring (207), a connecting shaft (208), a first bevel gear (209), an air cylinder (2010), a separator plate (2011), a round rod (2012), an elastic element (2013), an air pipe (2014), a rack (2015), a first flat gear (2016), and a second bevel gear (2017); the insulation board (201) is fixedly attached to the inner side of the protective shell (1); A water inlet pipe (202) is installed on the protective shell (1), and the water inlet pipe (202) penetrates the insulation board (201); an air cylinder (2010) is fixed to the upper inner side of the insulation board (201); a connecting pipe (203) connects the air cylinder (2010) and the water inlet pipe (202); a filter cotton (204) is installed on the right inner side of the water inlet pipe (202); a spray head (205) is installed on the right inner side of the water inlet pipe (202), and the spray head (205) is located to the left of the filter cotton (204); a baffle (206) is installed on the right inner side of the water inlet pipe (202), and... The baffle (206) is located to the left of the spray head (205); a sealing ring (207) is installed on the right side of the inner side of the water inlet pipe (202), and the sealing ring (207) is located on the outside of the baffle (206); a connecting shaft (208) is fixedly connected to the baffle (206), and the connecting shaft (208) is rotatably connected to the water inlet pipe (202); a first bevel gear (209) is fixedly connected to the upper side of the connecting shaft (208); an elastic element (2013) is fixedly connected to the inner side of the air cylinder (2010); a round rod (2012) is slidably connected to the inner side of the air cylinder (2010), and the round rod (2012) is slidably connected to the inner side of the air cylinder (2010). 2) Located on the outside of the elastic element (2013); a partition plate (2011) is fixedly connected to the lower end of the elastic element (2013); the partition plate (2011) is fixedly connected to the round rod (2012); an air pipe (2014) is connected to the upper side of the air cylinder (2010); a rack (2015) is fixedly connected to the upper side of the round rod (2012); a first flat gear (2016) is rotatably connected to the inner side of the protective shell (1) through a connecting rod; a second bevel gear (2017) is rotatably connected to the inner side of the protective shell (1) through a connecting rod; the second bevel gear (2017) meshes with the first bevel gear (209); The conversion assembly includes a fixed ring (301), a baffle (302), a servo motor (303), a second spur gear (304), a hollow rod (305), a third spur gear (306), a connecting plate (307), a sampling tube (308), a collection tube (309), a discharge tube (3010), a waste discharge tube (3011), and a limiting plate (3012); a fixed ring (301) is fixedly connected to the inner center of the insulation board (201); a baffle (302) is fixedly connected to the inner side of the fixed ring (301); a hollow rod (305) is rotatably connected to the fixed ring (301); a servo motor (303) is installed inside the insulation board (201); a second spur gear (304) is fixedly connected to the output shaft of the servo motor (303); a hollow rod (305) is connected to the output shaft of the servo motor (303); a connecting plate (307), a sampling tube (308), a collection tube (309), a sampling tube (3010), a waste discharge tube (3011), and a limiting plate (3012); a fixed ring (301) is fixedly connected to the inner center of the insulation board (201); a baffle (302) is fixedly connected to the inner side of the fixed ring (301); a hollow rod (305) is rotatably connected to the fixed ring (301); a servo motor (303) is installed inside the insulation board (201); a second spur gear (304) is fixedly connected to the output shaft of the servo motor (303); a hollow rod (305) is fixedly connected to the output shaft of the servo motor (301); a connecting plate (305) is connected to the output shaft of the servo motor (301); a connecting plate (306), a sampling tube (307), a collection tube ( 5) A third spur gear (306) is fixedly connected to the top; the third spur gear (306) meshes with the second spur gear (304); a connecting plate (307) is fixedly connected to the lower side of the hollow rod (305); three annularly arranged sampling tubes (308) are fixedly connected to the lower surface of the connecting plate (307); three annularly arranged collection tubes (309) are fixedly connected to the lower surface of the connecting plate (307); a limiting plate (3012) is fixedly connected to the upper inner side of the insulation board (201); a discharge tube (3010) is provided between the lower side of the three sampling tubes (308) and the limiting plate (3012); a waste discharge tube (3011) is provided at the center point of the three collection tubes (309); the three discharge tubes (3010) are in contact with the waste discharge tube (3011) and the lower surface of the cap (5).

2. A stratified groundwater sampling device according to claim 1, characterized in that: The weighting block (2) is set to be arc-shaped.

3. A stratified groundwater sampling device according to claim 1, characterized in that: The nozzle (205) is shaped like a frustum and has several through holes on the right side.

4. A stratified groundwater sampling device according to claim 1, characterized in that: The divider plate (2011) divides the air cylinder (2010) into two separate, unconnected spaces.

5. A stratified groundwater sampling device according to claim 1, characterized in that: The connection point between the connecting pipe (203) and the water inlet pipe (202) is located between the spray head (205) and the baffle (206).

6. A stratified groundwater sampling device according to claim 5, characterized in that: The baffle (302) is provided with a round hole corresponding to the water inlet pipe (202).

7. A stratified groundwater sampling device according to claim 6, characterized in that: The connecting plate (307) is provided with a sampling inlet and a wastewater removal inlet.

8. A stratified groundwater sampling device according to claim 7, characterized in that: The outlet pipe (3010) located below the connecting plate (307) is configured as a flexible hose.

Images