Multistage layered water pumping test device for hydrogeological survey

Abstract

The utility model relates to a multi-stage layered water pumping test device for hydrogeological survey, and effectively solves the problems that an existing water pumping test device is easy to collide with a well wall, so that soil or other impurities are easy to enter during sampling, water pumping and sampling of aquifers with different depths are inconvenient, and the water pumping test efficiency is low. According to the multi-stage layered water pumping test device for hydrogeological exploration, through the arrangement of the protective cylinder, the first water pumping pipe structure, the inflatable air bag, the telescopic cylinder, the second water pumping pipe structure and the inductor, the inflatable air bag can be attached to the inner wall of a sample well in the falling process of the protective cylinder and the telescopic cylinder, the inflatable air bag is prevented from colliding with the well wall, and impurity mixing is reduced; different distances between the telescopic cylinder and the protective cylinder can be adjusted, layered water pumping tests can be conveniently carried out on multiple stages of water-bearing layers with different distances and depths, multiple times of operation is not needed, the water pumping test efficiency is greatly improved, the permeability of the corresponding water-bearing layer can be detected through the sensor, and the practicability of the water pumping test device is enhanced.

Description

Technical Field

[0001] The utility model belongs to the technical field of pumping test, and in particular relates to a multi-stage layered pumping test device for hydrogeological survey. Background Art

[0002] With the in-depth study of groundwater, detailed hydrogeological parameters can be obtained more accurately through stratified pumping tests of different aquifers in hydrogeological boreholes (wells). Stratified pumping tests are an important means of obtaining hydrogeological parameters such as water volume, water quality, water temperature, and permeability of each aquifer section.

[0003] When extracting water samples from a sample well drilled in advance, it is generally necessary to lower the pumping device into the well through a traction device for sampling, then pull out the pumping device, take out the water sample, replace it with a new sampler, and lower it again for sampling, which is time-consuming. In addition, the sampler lacks a positioning mechanism during the sampling process and is prone to collision with the well wall, causing mud or other impurities to be easily mixed in during sampling, resulting in inaccurate water sampling test results; and the existing pumping test device is not convenient for pumping water samples from aquifers of different depths. It is necessary to drill sample wells of different depths multiple times and lower the pumping equipment into the well for extraction. The operation is complicated and time-consuming, resulting in low efficiency of the pumping test. Utility Model Content

[0004] In view of the above situation, in order to overcome the defects of the existing technology, the utility model provides a multi-stage stratified pumping test device for hydrogeological survey. The multi-stage stratified pumping test device for hydrogeological survey is convenient for performing stratified pumping tests on aquifers with multiple levels of different spacing and depths. It does not require multiple operations and is simple to operate, which greatly improves the efficiency of the pumping test. The permeability of the corresponding aquifer can be detected through the sensor, thereby enhancing the practicality of the pumping test device.

[0005] A multi-stage layered pumping test device for hydrogeological exploration, comprising a protective cylinder with a connecting plate fixedly connected to the top, the bottom of the protective cylinder is closed and a transparent cannula is fixedly connected to the center of the inner bottom wall at the top and bottom, a first pumping pipe structure for pumping water from the protective cylinder is passed through the interior of the cannula, and a water seepage structure for circulating water is provided at the bottom of the side of the protective cylinder; the device also comprises an inflatable airbag and an inflatable tube for sealing the bottom of the protective cylinder, the inflatable tube is connected to the inner side wall of the inflatable airbag and passed through the interior of the protective cylinder, the inflatable airbag is sleeved on the bottom of the outer side of the protective cylinder and the inner surface is fixedly bonded to the protective cylinder The bottom of the cylinder; it also includes a telescopic cylinder that can move up and down inside the protective cylinder, and the bottom of the side of the telescopic cylinder is provided with a water seepage structure identical to that on the protective cylinder, the inner bottom wall of the telescopic cylinder is in a completely sealed state, and a sleeve with a top opening is fixedly connected to the center of the circle of the inner bottom wall, and a second water pumping pipe structure for pumping water from the telescopic cylinder is passed through the interior of the sleeve, and the top of the second water pumping pipe structure is connected to the first water pumping pipe structure by a threaded connection; it also includes a sensor, and the protective cylinder and the telescopic cylinder side are fixedly installed with a sensor near the top of the water seepage structure, and the sensing end of the sensor is arranged inside the protective cylinder and the telescopic cylinder.

[0006] Preferably, the telescopic cylinder includes a telescopic plate and a bottom cylinder that are passed through the side of the protective cylinder. The number of the telescopic plates is four and the four telescopic plates are fixedly connected to the top of the bottom cylinder in the form of a circular array, and the four telescopic plates are all passed through the inside of the side of the protective cylinder from the bottom of the protective cylinder.

[0007] Preferably, fixing bolts are threaded through the bottom of the two corresponding sides of the protective tube. The number of the protective tubes can be several and the several protective tubes are fixedly connected to each other in a state of vertical correspondence of the axes. The connecting plate on the top of one protective tube can be inserted into the bottom of another protective tube on top of it. The fixing bolts pass through the side of the bottom of the protective tube and are threadedly connected to the connecting plate on the top of the other protective tube to fix the two adjacent protective tubes.

[0008] Preferably, two of the telescopic plates corresponding to the fixing bolts on both sides of the bottom of the protective tube are provided with a number of positioning holes at equal distances, and the fixing bolts on both sides of the bottom of the protective tube connected to the telescopic tube are threadedly passed through the corresponding positioning holes on the side of the telescopic plate, so as to adjust the distance between the bottom cylinder and the protective tube.

[0009] Preferably, the first water pumping pipe structure includes a first pipe, a first filter pipe head, a first one-way solenoid valve, and a second one-way solenoid valve. The top and bottom ends of the first pipe are structures that can be connected to each other. The first filter pipe head is fixedly connected to the side of the bottom of the first pipe and is passed through the side of the insert pipe. The first filter pipe head is a right angle and the bottom end is close to the inner bottom wall of the protective tube. The first pipe passes through the insert pipe and is arranged at one end below the protective tube. A first one-way solenoid valve for controlling its circulation is fixedly installed. The side of the first filter pipe head is fixedly installed with a second one-way solenoid valve for controlling its circulation.

[0010] Preferably, the seepage structure includes seepage holes and seepage nets, the number of the seepage holes is several and the several seepage holes are evenly divided into four groups, the four groups of seepage holes are opened in the form of a circular array around the bottom of the protective tube and are all arranged between two adjacent telescopic plates, and both sides of each group of seepage holes are provided with seepage nets to prevent blockage, and the bottom of the side of the protective tube and the side of the bottom cylinder are provided with a seepage structure that allows water in the soil layer to penetrate into its interior.

[0011] Preferably, the bottom of the outer side of the protective tube and the bottom cylinder are fixedly bonded with inflatable airbags, and adjacent inflatable airbags are connected through inflation tubes, and the top of the inflation tube near the top can be connected to an external inflation device.

[0012] Preferably, the second water pumping pipe structure includes a second pipe, a second filter pipe head, a third one-way solenoid valve and a telescopic tube. The bottom end of the second pipe is passed through the interior of the sleeve and the top end can be connected to the bottom end of the first pipe by a thread. The telescopic tube is arranged in the middle of the second pipe, which can facilitate the adjustment of the length of the second pipe according to the telescopic situation of the telescopic cylinder. The second filter pipe head is fixedly connected to the side of the bottom of the second pipe and passed through the side of the sleeve. The second filter pipe head has the same shape as the first filter pipe head and its bottom end is close to the inner bottom wall of the bottom cylinder. The third one-way solenoid valve is fixedly mounted on the side of the second filter pipe head.

[0013] Preferably, the top end of the second pipe is connected to the bottom end of the first pipe by threads and is interconnected. The number of the first pipes is the same as the number of protective tubes and several first pipes are interconnected by threads. The first pipe near the top can be connected to the pumping end of the external pumping equipment.

[0014] Preferably, sensors are fixedly mounted on the sides of the protective cylinder and the bottom cylinder, and the height of the sensor on the side of the protective cylinder relative to the bottom of the protective cylinder is the same as the height of the sensor on the side of the bottom cylinder relative to the bottom of the bottom cylinder, and the inner diameters of the protective cylinder and the bottom cylinder are the same.

[0015] The beneficial effects of the above technical solution are:

[0016] The multi-stage layered pumping test device for hydrogeological exploration is provided with a protective tube, a first pumping pipe structure, an inflatable airbag, a telescopic tube, a second pumping pipe structure and a sensor. The protective tube and the telescopic tube can be placed in a pre-drilled sample well, and multiple protective tubes can be assembled according to the required pumping depth, so that the overall length is adapted to the required pumping depth. During the falling process of the protective tube and the telescopic tube, the inflatable airbag will fit with the inner wall of the sample well to prevent it from colliding with the well wall and reduce the mixing of impurities. Different spacings can be adjusted between the telescopic tube and the protective tube, and multiple protective tubes can be provided. Therefore, the first pumping pipe structure and the second pumping pipe structure can facilitate layered pumping tests on aquifers with multiple levels of different spacings and depths. Multiple operations are not required and the operation is simple, which greatly improves the efficiency of the pumping test. The permeability of the corresponding aquifer can be detected by the sensor, thereby enhancing the practicality of the pumping test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the telescopic cylinder of the utility model in an extended state;

[0019] Figure 3 This is a schematic diagram of the protective tube and telescopic tube of the utility model in a disassembled state;

[0020] Figure 4 This is a schematic cross-sectional view of the overall structure of the utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the protective tube and the first water pumping pipe of the utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the telescopic cylinder and the second water pumping pipe of the utility model;

[0023] Figure 7 This is a schematic diagram of the inflatable airbag and inflation tube of the utility model.

[0024] In the figure: 1. Protective cylinder; 2. Connecting plate; 3. Intubation tube; 4. Inflatable airbag; 5. Inflatable tube; 6. Telescopic cylinder; 601. Telescopic plate; 602. Bottom cylinder; 7. Sleeve; 8. Sensor; 9. Fixing bolt; 10. Positioning hole; 11. First pipeline; 12. First filter tube head; 13. First one-way solenoid valve; 14. Second one-way solenoid valve; 15. Seepage hole; 16. Seepage net; 17. Second pipeline; 18. Second filter tube head; 19. Third one-way solenoid valve; 20. Telescopic tube. DETAILED DESCRIPTION

[0025] The above and other technical contents, features and effects of the present invention are described in detail below with reference to the attached Figures 1 to 7The embodiments are described in detail.

[0026] This embodiment provides a multi-stage stratified pumping test device for hydrogeological survey, as shown in the attached Figure 1-7 As shown, it includes a protective tube 1 with a connecting plate 2 fixedly connected to the top. There are two connecting plates 2, and the two connecting plates 2 are respectively fixedly connected to the two sides of the top of the protective tube 1 and are symmetrically arranged with the vertical center line of the protective tube 1 as the symmetry axis. The bottom of the two corresponding sides of the protective tube 1 is threaded with fixing bolts 9. The number of protective tubes 1 can be several, and several protective tubes 1 are fixedly connected to each other in a state of vertical correspondence of the axis. The connecting plate 2 at the top of one protective tube 1 can be inserted into the bottom of another protective tube 1 on its top. The fixing bolts 9 pass through the side of the bottom of the protective tube 1 and are threadedly connected to the connecting plate 2 at the top of the other protective tube 1, so that the upper and lower adjacent protective tubes 1 can be fixedly connected.

[0027] The bottom of the protective cylinder 1 is closed and a cannula 3 that is transparent from top to bottom is fixedly connected to the center of the inner bottom wall. A first water pumping pipe structure for pumping water from the protective cylinder 1 is provided inside the cannula 3. The first water pumping pipe structure includes a first pipe 11, a first filter pipe head 12, a first one-way solenoid valve 13, and a second one-way solenoid valve 14. The top and bottom ends of the first pipe 11 are structures that can be connected to each other and its bottom end is provided inside the cannula 3, which can close the opening at the top of the cannula 3 to prevent water from entering the protective cylinder 1. The water flows downward from the cannula 3, the first filter tube head 12 is fixedly connected to the side of the bottom of the first pipe 11 and is arranged on the side of the cannula 3. The first filter tube head 12 is at a right angle and the bottom end is close to the inner bottom wall of the protective tube 1, which can fully extract the water in the protective tube 1. The first pipe 11 passes through the cannula 3 and is arranged at one end below the protective tube 1. A first one-way solenoid valve 13 for controlling its flow is fixedly installed. A second one-way solenoid valve 14 for controlling its flow is fixedly installed on the side of the first filter tube head 12;

[0028] A seepage structure for circulating water is provided at the bottom of the side of the protective tube 1, and a seepage structure identical to that on the protective tube 1 is provided at the bottom of the side of the telescopic tube 6. The seepage structure includes seepage holes 15 and a seepage net 16. The number of seepage holes 15 is several, and the several seepage holes 15 are evenly divided into four groups. The four groups of seepage holes 15 are provided in the form of a circular array around the bottom of the protective tube 1 and are all arranged between two adjacent telescopic plates 601. The seepage holes 15 and the seepage net 16 are not connected to the gaps passed through the telescopic plates 601. Seepage nets 16 are provided on both sides of each group of seepage holes 15 to prevent blockage. The water in the soil layer around the protective tube 1 will penetrate into the interior of the protective tube 1 from the seepage holes 15 and the seepage net 16.

[0029] The air bag 4 is connected to the bottom of the protective tube 1 and the air bag 4 is inflated. The air bag 4 is connected to the inner wall of the protective tube 1 and is passed through the inside of the protective tube 1. The air bag 4 is sleeved on the bottom of the outer side of the protective tube 1 and the inner surface is fixedly bonded to the bottom of the protective tube 1. The bottom of the outer side of the protective tube 1 and the bottom of the bottom cylinder 602 are fixedly bonded with the air bag 4, and the adjacent air bags 4 are connected through the air bag 5, and the top of the air bag 5 near the top can be connected to the external inflation device. The external inflation device can inflate each air bag 4 in turn through the air bag 5. Before putting the protective tube 1 and the telescopic tube 6 into the sample well, a certain amount of gas can be filled into each air bag 4 to make each air bag The bag 4 can fit the inner wall of the sample well, thereby preventing the protective tube 1 and the telescopic tube 6 from colliding with the inner wall of the sample well when they are lowered. Only the inflatable air bag 4 contacts the inner wall of the sample well, which can effectively reduce the soil or impurities on the inner wall of the sample well from falling, and prevent impurities from entering the protective tube 1 and affecting the pumping test results; when the protective tube 1 and the telescopic tube 6 are completely placed in the sample well, the external inflation device can continue to pressurize and inflate each inflatable air bag 4 through the inflation tube 5, so that the inflatable air bag 4 can be pressed against the corresponding part of the inner wall of the sample well, thereby separating the inside of the sample well into layers, so that the water at the corresponding depth of each protective tube 1 and the telescopic tube 6 can penetrate into the protective tube 1 of its corresponding depth, preventing the water from flowing down from the gap between the inflatable air bag 4 and the inner wall of the sample well.

[0030] The protective tube 1 further comprises a telescopic tube 6 that can move up and down inside the protective tube 1. The telescopic tube 6 comprises a telescopic plate 601 and a bottom cylinder 602 that pass through the inside of the side surface of the protective tube 1. There are four telescopic plates 601, and the four telescopic plates 601 are fixedly connected to the top of the bottom cylinder 602 in the form of a circular array. The four telescopic plates 601 are all passed through the inside of the side surface of the protective tube 1 from the bottom. The tops of the outer sides of the four telescopic plates 601 are all fixedly connected to limiting blocks, and limiting grooves for limiting the limiting blocks are provided around the outer side surface of the protective tube 1. The limiting blocks on the sides of the four telescopic plates 601 can only move downward along the inner mountain of the limiting groove, which can prevent the telescopic plates 601 from falling off from the protective tube 1. The telescopic tube 6 plays a good limiting role.

[0031] Two of the telescopic plates 601 corresponding to the fixing bolts 9 on both sides of the bottom of the protective cylinder 1 are provided with a plurality of positioning holes 10 at equal intervals on their sides. The fixing bolts 9 on both sides of the bottom of the protective cylinder 1 connected to the telescopic cylinder 6 are threadedly penetrated into the corresponding positioning holes 10 on the side of the telescopic plate 601, so that the spacing between the bottom cylinder 602 and the protective cylinder 1 can be adjusted. When the fixing bolts 9 on both sides are threadedly connected to the positioning holes 10 at different heights, the bottom cylinder 602 and the protective cylinder 1 can be fixed at different spacing positions, so that the spacing between the protective cylinder 1 and the bottom cylinder 602 can be adjusted according to the aquifers of different depths to be surveyed, so as to facilitate the pumping test of aquifers of different depths with irregular spacing.

[0032] The inner bottom wall of the telescopic cylinder 6 is in a completely sealed state and a sleeve 7 with a top opening is fixedly connected at the center of its inner bottom wall. A second water pumping pipe structure for pumping water from the telescopic cylinder 6 is provided inside the sleeve 7. The top of the second water pumping pipe structure is threadedly connected to the first water pumping pipe structure. The second water pumping pipe structure includes a second pipe 17, a second filter pipe head 18, a third one-way solenoid valve 19 and a telescopic pipe 20. The bottom end of the second pipe 17 is passed through the interior of the sleeve 7 and the top end can be connected to the bottom end of the first pipe 11 through a thread. The telescopic pipe 20 is arranged in the middle of the second pipe 17, which can facilitate the adjustment of the length of the second pipe 17 according to the telescopic situation of the telescopic cylinder 6. The second filter pipe head 18 is fixedly connected to the side of the bottom of the second pipe 17 and is passed through the side of the sleeve 7. The second filter pipe head 18 has the same shape as the first filter pipe head 12 and its bottom end is close to the inner bottom wall of the bottom cylinder 602. The third one-way solenoid valve 19 is fixedly mounted on the side of the second filter pipe head 18;

[0033] The top end of the second pipe 17 is connected to the bottom end of the first pipe 11 through a thread and is connected to each other. The number of first pipes 11 is the same as the number of protective tubes 1, and several first pipes 11 are connected to each other through threads. The first pipe 11 near the top can be connected to the pumping end of the external pumping equipment.

[0034] When a multi-level stratified pumping test is required for aquifers at different depths, the second one-way solenoid valves 14 on the multiple first filter pipe heads 12 can be closed by an external control unit, and the first one-way solenoid valves 13 at the bottom of the multiple first pipes 11 and the third one-way solenoid valves 19 on the second filter pipe head 18 at the bottom can be controlled to flow. Then, the pumping equipment can be operated to pump out the water that has seeped into the bottom cylinder 602 through the second filter pipe head 18, thereby performing a pumping test on the aquifer at the corresponding depth of the bottom cylinder 602, which is convenient for analyzing the geological parameters of the aquifer at the corresponding depth. Then, the second one-way solenoid valve 14 corresponding to the depth where the pumping test is required and all the first one-way solenoid valves 13 above it can be controlled to flow, and the corresponding first one-way solenoid valve 13 can be closed, so that the water that has seeped into the protective cylinder 1 corresponding to the depth where the pumping test is required can be pumped out through the external pumping equipment, which is convenient for analyzing the geological parameters of the aquifer at the corresponding depth.

[0035] The protective tube 1 and the bottom cylinder 602 are both fixedly mounted with a sensor 8. The height of the sensor 8 on the side of the protective tube 1 relative to the bottom of the protective tube 1 is the same as the height of the sensor 8 on the side of the bottom cylinder 602 relative to the bottom of the bottom cylinder 602. The sensing end of the sensor 8 is set inside the protective tube 1 and the telescopic tube 6. The first one-way solenoid valve 13, the second one-way solenoid valve 14, the third one-way solenoid valve 19 and the sensor 8 are all electrically connected to the external control unit. The protective tube 1 and the bottom cylinder 60 2 has the same inner diameter, which can ensure that the volumes of the protective cylinder 1 and the bottom cylinder 602 at the same height are the same. Therefore, after the water in the protective cylinder 1 and the telescopic tube 6 at different depths is pumped out by the external pumping equipment, the permeability and water content of each aquifer can be analyzed according to the time it takes for the sensor 8 corresponding to each aquifer to sense the water body. The shorter the time it takes for the sensor 8 to sense the water body, the greater the permeability of the water body in the corresponding aquifer. On the contrary, the longer the time it takes for the sensor 8 to sense the water body, the smaller the permeability of the water body in the corresponding aquifer.

[0036] In some other embodiments of the present application, multiple protective tubes 1 can be selected to be connected in series according to the depth of the drilled sample well, until the pumping test device can perform pumping tests on aquifers of different depths. The structures of the multiple protective tubes 1 are the same and can be connected to each other vertically and coaxially. A slot corresponding to the connecting plate 2 at its top is provided at the bottom of the protective tube 1. The connecting plate 2 at the top of the next protective tube 1 can be inserted into the corresponding slot at the bottom of the protective tube 1 above it. A first pumping pipe structure is passed through the interior of each protective tube 1, and the multiple first pumping pipe structures in the multiple protective tubes 1 can be connected or disassembled to each other, so that each structure of the device is a split structure, which is convenient for installation and disassembly.

[0037] The above description is only for the purpose of illustrating the present invention. It should be understood that the present invention is not limited to the above embodiments, and various variations that conform to the concept of the present invention are within the scope of protection of the present invention.

Claims

1. A multi-stage stratified pumping test device for hydrogeological exploration, comprising a protective cylinder (1) with a connecting plate (2) fixedly connected to the top, characterized in that: The bottom of the protective tube (1) is closed, and a vertically transparent insert (3) is fixedly connected to the center of the inner bottom wall. A first water pumping pipe structure for pumping water from the protective tube (1) is provided inside the insert (3). A water seepage structure for circulating water is provided at the bottom of the side of the protective tube (1). It also includes an inflatable airbag (4) and an inflatable tube (5) for sealing the bottom of the protective tube (1), wherein the inflatable tube (5) is connected to the inner wall of the inflatable airbag (4) and is arranged inside the protective tube (1), and the inflatable airbag (4) is sleeved on the bottom of the outer side of the protective tube (1) and the inner surface is fixedly bonded to the bottom of the protective tube (1); It also includes a telescopic cylinder (6) that can move up and down inside the protective cylinder (1), the bottom of the side of the telescopic cylinder (6) is provided with a water seepage structure identical to that on the protective cylinder (1), the inner bottom wall of the telescopic cylinder (6) is in a completely sealed state, and a sleeve (7) with a top opening is fixedly connected to the center of the inner bottom wall, a second water pumping pipe structure for pumping water from the telescopic cylinder (6) is provided inside the sleeve (7), and the top end of the second water pumping pipe structure is connected to the first water pumping pipe structure via a threaded connection; It also includes a sensor (8), which is fixedly installed on the side of the protective tube (1) and the telescopic tube (6) near the top of the water seepage structure, and the sensing end of the sensor (8) is arranged inside the protective tube (1) and the telescopic tube (6).

2. A multi-stage stratified pumping test device for hydrogeological exploration according to claim 1, characterized in that: The telescopic cylinder (6) comprises a telescopic plate (601) and a bottom cylinder (602) that are inserted into the side of the protective cylinder (1). The number of the telescopic plates (601) is four, and the four telescopic plates (601) are fixedly connected to the top of the bottom cylinder (602) in the form of a ring array. The four telescopic plates (601) are all inserted into the side of the protective cylinder (1) from the bottom of the protective cylinder (1).

3. The multi-stage stratified pumping test device for hydrogeological exploration according to claim 2, characterized in that: The bottoms of the two corresponding sides of the protective tube (1) are both threaded with fixing bolts (9), the number of the protective tubes (1) can be several and the several protective tubes (1) are fixedly connected to each other in a state of vertically corresponding axes, the connecting plate (2) at the top of one protective tube (1) can be plugged into the bottom of another protective tube (1) at its top, and the fixing bolts (9) pass through the side of the bottom of the protective tube (1) and are threadedly connected to the connecting plate (2) at the top of the other protective tube (1), so as to fix the two adjacent protective tubes (1) together.

4. The multi-stage stratified pumping test device for hydrogeological exploration according to claim 3, characterized in that: A plurality of positioning holes (10) are equidistantly provided on the sides of the two telescopic plates (601) corresponding to the fixing bolts (9) on both sides of the bottom of the protective cylinder (1). The fixing bolts (9) on both sides of the bottom of the protective cylinder (1) connected to the telescopic cylinder (6) are threadedly inserted into the corresponding positioning holes (10) on the sides of the telescopic plates (601), so that the distance between the bottom cylinder (602) and the protective cylinder (1) can be adjusted.

5. The multi-stage stratified pumping test device for hydrogeological exploration according to claim 1, characterized in that: The first water pumping pipe structure comprises a first pipe (11), a first filter pipe head (12), a first one-way solenoid valve (13), and a second one-way solenoid valve (14). The top and bottom ends of the first pipe (11) are structures that can be connected to each other. The first filter pipe head (12) is fixedly connected to the side of the bottom of the first pipe (11) and is arranged on the side of the insertion pipe (3). The first filter pipe head (12) is at a right angle and the bottom end is close to the inner bottom wall of the protective tube (1). The first pipe (11) passes through the insertion pipe (3) and is arranged below the protective tube (1). One end thereof is fixedly installed with a first one-way solenoid valve (13) for controlling its circulation. The side of the first filter pipe head (12) is fixedly installed with a second one-way solenoid valve (14) for controlling its circulation.

6. The multi-stage stratified pumping test device for hydrogeological exploration according to claim 2, characterized in that: The water seepage structure comprises a water seepage hole (15) and a water seepage net (16). The number of the water seepage holes (15) is several and the several water seepage holes (15) are evenly divided into four groups. The four groups of water seepage holes (15) are opened in the form of a ring array around the bottom of the protective tube (1) and are all arranged between two adjacent telescopic plates (601). Both sides of each group of water seepage holes (15) are provided with a water seepage net (16) that can prevent blockage. The bottom of the side of the protective tube (1) and the side of the bottom cylinder (602) are provided with a water seepage structure that can allow water in the soil layer to penetrate into the interior thereof.

7. The multi-stage stratified pumping test device for hydrogeological exploration according to claim 2, characterized in that: The bottom of the outer side of the protective tube (1) and the bottom cylinder (602) are fixedly bonded with an inflatable airbag (4), and adjacent inflatable airbags (4) are connected through an inflatable tube (5), and the top of the inflatable tube (5) near the top can be connected to an external inflatable device.

8. The multi-stage stratified pumping test device for hydrogeological exploration according to claim 2, characterized in that: The second water pumping pipe structure includes a second pipe (17), a second filter pipe head (18), a third one-way solenoid valve (19) and a telescopic pipe (20). The bottom end of the second pipe (17) is passed through the interior of the sleeve (7) and the top end can be connected to the bottom end of the first pipe (11) through a thread. The telescopic pipe (20) is arranged in the middle of the second pipe (17) and can facilitate the adjustment of the length of the second pipe (17) according to the telescopic condition of the telescopic cylinder (6). The second filter pipe head (18) is fixedly connected to the side of the bottom of the second pipe (17) and passed through the side of the sleeve (7). The second filter pipe head (18) has the same shape as the first filter pipe head (12) and its bottom end is close to the inner bottom wall of the bottom cylinder (602). The third one-way solenoid valve (19) is fixedly installed on the side of the second filter pipe head (18).

9. The multi-stage stratified pumping test device for hydrogeological exploration according to claim 8, characterized in that: The top end of the second pipe (17) is connected to the bottom end of the first pipe (11) through a thread and is in communication with each other. The number of the first pipes (11) is the same as the number of the protective tubes (1), and several first pipes (11) are in communication with each other through threads. The first pipe (11) near the top end can be in communication with the pumping end of an external pumping device.

10. The multi-stage stratified pumping test device for hydrogeological exploration according to claim 2, characterized in that: The sides of the protective cylinder (1) and the bottom cylinder (602) are both fixedly mounted with sensors (8), and the height of the sensor (8) on the side of the protective cylinder (1) relative to the bottom of the protective cylinder (1) is the same as the height of the sensor (8) on the side of the bottom cylinder (602) relative to the bottom of the bottom cylinder (602), and the inner diameters of the protective cylinder (1) and the bottom cylinder (602) are the same.

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