A groundwater detection device and a detection method thereof

Abstract

The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater detection equipment and its detection method.The present application relates to the field of groundwater detection, particularly to a kind of groundwater

Description

TECHNICAL FIELD

[0001] The present application relates to the field of groundwater detection, in particular to a groundwater detection device and a detection method thereof. BACKGROUND

[0002] In order to reasonably develop and utilize groundwater resources, curb the further deterioration of existing groundwater environmental problems, and prevent similar problems from occurring in new groundwater development areas, it is necessary to monitor the dynamic changes of groundwater on the basis of strengthening exploration. According to the detection site, it can be divided into in-situ detection and ex-situ detection. The in-situ detection technology is difficult, and the ex-situ detection usually causes waste of time and preservation of reagents, which is very inconvenient when taking multiple groundwater samples, thereby making the detection effect poor. SUMMARY

[0003] In order to ensure that the groundwater monitoring well can accurately position and sample each aquifer in the case of one well and multiple layers, it is necessary to provide a groundwater detection device and a detection method thereof for the above technical problems. The present application adopts a video positioning method to identify layered flow field and perform layered sampling and matching detection. When used, it can cooperate with a variable frequency valve to perform static sampling, cooperate with a filter screen and an electric ball valve to perform equal proportioning and neutralization detection, thereby avoiding the problem of multiple groundwater sampling and improving the matching detection effect of samples at different depths.

[0004] The present application provides a groundwater detection device, comprising:

[0005] A shore device is installed at the top end of the monitoring well pipe and the connecting end extends into the monitoring well pipe.

[0006] Two inflatable packers are symmetrically arranged in the monitoring well pipe with coinciding central axes and are used to fit and block the inner wall of the monitoring well pipe. The inflatable packer is connected to the connecting end of the shore device.

[0007] A flow velocity and direction instrument is located between the two inflatable packers and is used to detect groundwater.

[0008] A sampling device is arranged outside the monitoring well pipe. The sampling end of the sampling device is located between the two inflatable packers and moves with the movement of the connecting end of the shore device.

[0009] In one embodiment, the shore device comprises a mounting frame, a fishing wheel, a driven gear and a driving gear disc; the mounting frame is arranged at the mouth of the monitoring well pipe, the fishing wheel is provided with a plurality of fishing wheels arranged in a ring array and rotatably mounted on the side of the mounting frame, a steel wire rope is wound around the fishing wheel, and one end of the steel wire rope extends into the monitoring well pipe, each fishing wheel is provided with a driven gear at one end, and the driving gear disc is rotatably mounted at the top end of the mounting frame and is engaged with the bottom surface of the plurality of driven gears.

[0010] In one embodiment, the shore device further comprises a sleeve ring, a guide pipe, a fixing disc and a servo motor; the sleeve ring is sleeved on the top end of the monitoring well pipe, the guide pipe is provided with a plurality of guide pipes arranged in a ring array and fixed on the sleeve ring, one end of the steel wire rope extending into the monitoring well pipe passes through the guide pipe, the fixing disc is sleeved on the top end of the mounting frame, the servo motor is mounted on the fixing disc and connected with the motor drive module, and the driving end of the servo motor is engaged with the top end of the driving gear disc.

[0011] In one embodiment, the inflatable packer comprises a cylinder, a first sealing compression ring, a flange, a crescent-shaped bending rod, a cross arm, a lifting ring and a silica gel sleeve; the cylinder is provided with a first sealing compression ring and a flange in sequence at one end, and a lifting ring is movably mounted at the other end, the surface of the cylinder is provided with a plurality of groups of connecting pieces arranged in a ring array, each group of connecting pieces comprises a hanging ear and a clamping buckle, a plurality of groups of crescent-shaped bending rods are arranged in a ring array, one end of each group of two crescent-shaped bending rods is rotatably mounted on the hanging ear and the clamping buckle, respectively, and the other ends of the two crescent-shaped bending rods are hingedly connected, one cross arm is transversely inserted into each crescent-shaped bending rod, the silica gel sleeve is sleeved on the crescent-shaped bending rod and the cross arm, and one end of the silica gel sleeve is clamped between the first sealing compression ring and the flange.

[0012] In one embodiment, the silica gel sleeve comprises two thin sleeve parts and a thickened part, the two thin sleeve parts are located at the two ends of the thickened part, respectively, one thin sleeve part is clamped between the first sealing compression ring and the flange, and the other thin sleeve part is fixed on the lifting ring, and the thickened part abuts in the recessed area formed at the connection of the two crescent-shaped bending rods.

[0013] In one embodiment, the top end of the cylinder is arranged in an open structure, the bottom end of the cylinder is closed, a pressure sensor is arranged at the bottom end of the cylinder, and a wire outlet pipe is further arranged on the side of the cylinder, the wire outlet pipe is used for threading and is connected with the pressure sensor.

[0014] In one embodiment, the expansion packer has a motor drive unit at one end, which includes a second sealing ring, a housing, a stepper motor, a top support, a motor drive plate, and a connector. The second sealing ring is fixed to the bottom end of the cylinder, the housing is installed on one side of the second sealing ring, and a silicone pad is provided on the other side of the housing. The stepper motor is located inside the housing, a top support is installed on one end of the stepper motor's lead screw, and a lead screw corrugated sleeve is fitted on the lead screw. The other end of the stepper motor's lead screw passes through the motor drive plate, and the connector is located between two adjacent motor drive plates.

[0015] In one embodiment, the flow velocity and direction meter includes a frame assembly, a main body component, a panel assembly, and a rod-lens assembly; the main body component is located within the frame assembly, the panel assembly is located at one end of the frame assembly and is used for routing pipelines, and the rod-lens assembly is located at the other end of the frame assembly and is used for monitoring groundwater.

[0016] In one embodiment, the rod lens assembly includes a plug, a three-pronged tail cap, a spacer, an LED plate, a sealing ring, a light guide plate assembly, an eyepiece micrometer scale plate, a lampshade, a fixing ring, and a quartz glass lens arranged sequentially from one end to the other.

[0017] The present invention also provides a groundwater detection method, applied to the groundwater detection equipment described in any of the above embodiments, the method comprising:

[0018] The onshore device is activated to extend and retract the connection end, thereby releasing the expansion packer to the specified depth;

[0019] When the expansion packer is released to a certain depth underground, the expansion packer is activated and its edge expands to abut against the inner wall of the monitoring well pipe, thus completing the isolation of the internal space of the monitoring well pipe.

[0020] The flow velocity and direction meter was activated to monitor the groundwater within the two expansion packers;

[0021] The sampling device samples groundwater at the current depth and samples groundwater again after the depth changes. Each sample is input into a master sampling box and another new sampling box.

[0022] The aforementioned groundwater detection equipment and method involve activating the onshore device to extend and retract the connection end, thereby releasing the expansion packer to a specified depth. When the expansion packer is released to a certain depth underground, it is activated, causing the edge of the expansion packer to expand and abut against the inner wall of the monitoring well pipe, thus isolating the internal space of the monitoring well pipe. The flow velocity and direction meter is then activated to monitor the groundwater within the two expansion packers. At this point, the sampling device can be activated to sample the groundwater at the current depth, and the sampled groundwater is placed into a main sampling box and a new sampling box. Subsequently, the sampling device performs a sampling once each time the depth changes, and the sampled groundwater is input into the main sampling box and another new sampling box. To ensure accurate location and sampling of each aquifer in a single well with multiple layers, a video positioning method is used to identify the stratified flow field and perform stratified sampling and combination testing. During use, a frequency converter valve can be used for static sampling, and a filter and electric ball valve can be used for equal proportioning and neutralization testing. This avoids the problem of multiple water sampling and improves the testing effect of samples from different depths. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 One of the three-dimensional structural schematic diagrams of the shore-based device provided by the present invention;

[0025] Figure 2 A second three-dimensional structural schematic diagram of the shore-based device provided by the present invention;

[0026] Figure 3 A three-dimensional structural diagram of the expansion packer provided by the present invention;

[0027] Figure 4 This is a schematic cross-sectional view of the expansion packer provided by the present invention;

[0028] Figure 5 One of the structural schematic diagrams of the motor drive component provided by the present invention;

[0029] Figure 6 This is the second schematic diagram of the structure of the motor drive component provided by the present invention;

[0030] Figure 7 A three-dimensional structural schematic diagram of the flow velocity and direction meter provided by the present invention;

[0031] Figure 8This is a schematic diagram of the disassembled structure of the rod lens assembly provided by the present invention.

[0032] Figure label:

[0033] 10. Monitoring well casing; 110. Mounting bracket; 120. Fishing reel; 130. Driven gear; 141. Collar; 142. Guide tube; 150. Wire rope; 160. Fixed disc; 170. Drive gear disc; 180. Servo motor; 190. Motor drive module; 210. Cylinder; 221. First sealing ring; 222. Flange; 231. Hanging lug; 232. Climbing buckle; 240. Crescent-shaped rod; 250. Cross arm; 260. Lifting ring; 271. Thin sleeve section; 272. Thickened section; 281. Pressure sensor; 282. Outlet pipe; 310. Housing 320. Second sealing ring; 330. Stepper motor; 340. Top block; 350. Lead screw corrugated sleeve; 360. Silicone pad; 370. Lead screw; 380. Motor drive board; 390. Connector; 410. Frame assembly; 420. Main component; 430. Panel assembly; 440. Rod lens assembly; 441. Plug; 442. Three-pronged tail cap; 443. Spacer; 444. LED board; 445. Sealing ring; 446. Light guide plate assembly; 447. Lampshade; 448. Eyepiece micrometer scale plate; 449. Fixing ring; 4410. Quartz glass lens. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] The following is combined Figures 1 to 8 This invention describes a groundwater detection device and its detection method.

[0036] In one embodiment, a groundwater detection device includes an onshore device, two expansion packers, a flow velocity and direction meter, and a sampling device. The onshore device is installed at the top of a monitoring well pipe 10, with its connecting end extending into the monitoring well pipe 10. The two expansion packers are symmetrically arranged with their central axes aligned within the monitoring well pipe 10, and are used to seal the inner wall of the monitoring well pipe 10. The expansion packers are connected to the connecting end of the onshore device. The flow velocity and direction meter is located between the two expansion packers and is used to detect groundwater. The sampling device is located outside the monitoring well pipe 10, with its sampling end located between the two expansion packers and moving with the movement of the connecting end of the onshore device.

[0037] Specifically, during use, the onshore device is activated to extend and retract the connection end, thereby releasing the expansion packer to a specified depth. When the expansion packer is released to a certain depth underground, the expansion packer is activated and its edge expands to abut against the inner wall of the monitoring well pipe 10, completing the isolation of the internal space of the monitoring well pipe 10. The flow velocity and direction meter is activated to monitor the groundwater in the two expansion packers. At this time, the sampling device can be activated to sample the groundwater at the current depth, and the sampled groundwater is placed into the main sampling box and a new sampling box respectively. Afterwards, the sampling device will perform a sampling once each time the depth is changed, and the sampled groundwater will be input into the main sampling box and another new sampling box respectively.

[0038] When using the aforementioned groundwater detection equipment, the onshore device is activated to extend and retract the connection end, thereby releasing the expansion packer to a specified depth. When the expansion packer is released to a certain depth underground, the expansion packer is activated and its edge expands to abut against the inner wall of the monitoring well pipe 10, completing the isolation of the internal space of the monitoring well pipe 10. The flow velocity and direction meter is activated to monitor the groundwater in the two expansion packers. At this time, the sampling device can be activated to sample the groundwater at the current depth, and the sampled groundwater is placed into a main sampling box and a new sampling box respectively. Afterwards, the sampling device will perform a sampling once each time the depth is changed, and the sampled groundwater will be input into the main sampling box and another new sampling box respectively. To ensure accurate location and sampling of each aquifer in a single well with multiple layers, a video positioning method is used to identify the stratified flow field and perform stratified sampling and combination testing. During use, a frequency converter valve can be used for static sampling, and a filter and electric ball valve can be used for equal proportioning and neutralization testing. This avoids the problem of multiple water sampling and improves the testing effect of samples from different depths.

[0039] In one embodiment, the shore-based device includes a mounting frame 110, a fishing reel 120, a driven gear 130, and a drive gear 170. The mounting frame 110 is located at the opening of the monitoring well pipe 10. Multiple fishing reels 120 are arranged in a circular array and rotatably mounted on the side of the mounting frame 110. A steel wire rope 150 is wound around the fishing reel 120, and one end of the steel wire rope 150 extends into the monitoring well pipe 10. A driven gear 130 is mounted on one end of each fishing reel 120. The drive gear 170 is rotatably mounted on the top of the mounting frame 110, and the bottom surface of the drive gear 170 meshes with the multiple driven gears 130.

[0040] Specifically, the onshore device also includes a collar 141, a guide tube 142, a fixing plate 160, and a servo motor 180. The collar 141 is fitted onto the top of the monitoring well pipe 10. Multiple guide tubes 142 are arranged in a ring array and fixed on the collar 141. One end of the steel wire rope 150 extends into the monitoring well pipe 10 and passes through the guide tube 142. The fixing plate 160 is fitted onto the top of the mounting frame 110. The servo motor 180 is mounted on the fixing plate 160 and connected to the motor drive module 190. The drive end of the servo motor 180 is meshed with the top of the drive gear plate 170.

[0041] When in use, the servo motor 180 starts and drives the drive gear 170 to rotate, thereby driving multiple fishing reels 120 to rotate. The rotating fishing reels 120 will retract and extend the steel wire rope 150 wound on them, thereby releasing the expansion packer to the specified depth.

[0042] In one embodiment, the expansion packer includes a cylinder 210, a first sealing ring 221, a flange 222, a crescent-shaped rod 240, a cross arm 250, a lifting ring 260, and a silicone sleeve. The first sealing ring 221 and the flange 222 are sequentially installed at one end of the cylinder 210, and the lifting ring 260 is movably installed at the other end. Multiple sets of connectors are arranged in a ring array on the surface of the cylinder 210. Each set of connectors includes a lug 231 and a latch 232. Multiple sets of crescent-shaped rods 240 are arranged in a ring array. One end of two crescent-shaped rods 240 in the same set is rotatably installed on the lug 231 and the latch 232, respectively. The other ends of the two crescent-shaped rods 240 are hinged. A cross arm 250 is inserted laterally on each crescent-shaped rod 240. The silicone sleeve is sleeved on the crescent-shaped rod 240 and the cross arm 250, and one end of the silicone sleeve is clamped between the first sealing ring 221 and the flange 222.

[0043] Specifically, under normal conditions, the two ends of the crescent-shaped rod 240 are attached to the cylinder 210, and the middle of the crescent-shaped rod 240 is bent away from the cylinder 210. The silicone sleeve is fitted onto the crescent-shaped rod 240. When the lifting ring 260 moves along the direction of the cylinder 210, the two hinged crescent-shaped rods 240 will move closer to each other, thereby causing the hinge of the two crescent-shaped rods 240 to move away from the cylinder 210, thereby pushing the silicone sleeve to fit against the inner wall of the monitoring well pipe 10 to form a seal.

[0044] In one embodiment, the silicone sleeve includes two thin sleeve portions 271 and one thickened portion 272. The two thin sleeve portions 271 are located at both ends of the thickened portion 272. One thin sleeve portion 271 is sandwiched between the first sealing pressure ring 221 and the flange edge 222, and the other thin sleeve portion 271 is fixed on the lifting ring 260. The thickened portion 272 abuts against the recessed area formed at the connection of the two crescent-shaped rods 240.

[0045] Specifically, the thickened part 272 has an elliptical cross-section, which can effectively and stably engage with the connection of the two crescent-shaped rods 240, and will not easily detach when the state of the two crescent-shaped rods 240 changes.

[0046] In one embodiment, the top of the cylinder 210 is open and the bottom is closed. A pressure sensor 281 is provided at the bottom of the cylinder 210. A cable outlet tube 282 is also provided on the side of the cylinder 210. The cable outlet tube 282 is used for threading a wire and is connected to the pressure sensor 281.

[0047] Specifically, one end of the expansion packer is equipped with a motor drive component, which includes a second sealing ring 320, a housing 310, a stepper motor 330, a top support 340, a motor drive plate 380, and a connector 390. The second sealing ring 320 is fixed to the bottom of the cylinder 210. The housing 310 is installed on one side of the second sealing ring 320, and a silicone pad 360 is provided on the other side of the housing 310. The stepper motor 330 is located inside the housing 310. A top support 340 is installed on the lead screw 370 at one end of the stepper motor 330. The top support 340 is directly opposite the pressure sensor 281, and a lead screw corrugated sleeve 350 is fitted on the lead screw 370 at this end. The lead screw 370 at the other end of the stepper motor 330 passes through the motor drive plate 380, and the connector 390 is located between two adjacent motor drive plates 380.

[0048] It should be noted that because the expansion packer is an auxiliary device, various testing instruments are located between the two expansion packers. The power supply and communication cables and water pipes of these instruments must pass through the packer. Sometimes there are quite a few cables. At the same time, the packer is used to block the upper and lower layers of water in well 441. Therefore, it also needs a mechanism and electrical control. In practice, the well diameter is not large. The advantages of this design are that it provides expansion while also offering sufficient space for wiring; the concave center of the crescent-shaped rod 240, the crossarm 250 structure, and the surrounding skeleton form a near-circular surface, which facilitates the installation of a silicone sleeve, i.e., a silicone skin, on it. Furthermore, the well-designed protrusions and depressions of the skin help form an O-ring during skeleton expansion, ensuring a good fit with the well wall and effectively preventing water from flowing up and down; the push rod and the top pushing surface are not connected but only in contact, separated by silicone rubber, allowing for convenient and effective silicone protection of the motor without the need for a waterproof motor; the external controller sends signals to this device to control the raising and lowering of the motor's push rod, stopping the push rod's movement and maintaining its position based on the feedback thrust.

[0049] In one embodiment, the flow velocity and direction meter includes a frame assembly 410, a main body component 420, a panel assembly 430, and a rod lens assembly 440; the main body component 420 is located inside the frame assembly 410, the panel assembly 430 is located at one end of the frame assembly 410 and is used for laying pipelines, and the rod lens assembly 440 is located at the other end of the frame assembly 410 and is used for monitoring groundwater.

[0050] Specifically, the rod lens assembly 440 includes a plug 441, a three-pronged end cap 442, a spacer 443, an LED plate 444, a sealing ring 445, a light guide plate assembly 446, an eyepiece micrometer scale plate 448, a lampshade 447, a fixing ring 449, and a quartz glass lens 4410 arranged sequentially from one end to the other.

[0051] It should be noted that the flow velocity and direction meter works by photographing particles suspended in groundwater (tracking particles), using image recognition algorithms to calculate the particle's velocity, and then calculating the particle's direction of motion based on a reference direction.

[0052] In the rod lens assembly 440, a 1mm gap is reserved between the eyepiece micrometer scale plate 448 and the quartz lens after assembly. Several are installed on the outside of the frame assembly 410. The housing 310 is used to enclose the functional components and achieve waterproofing. Because the equipment operates underwater, the water pressure can reach 0.3Mpa. In order to ensure the normal operation of the electronic components of the equipment, the housing 310 needs to be sealed.

[0053] During operation, the focus is achieved by adjusting the water flow passing through the gap between the micrometer scale plate 448 of the eyepiece and the quartz lens. Focusing is accomplished by a motor driving the lens barrel up and down. Three springs apply tension to the lens barrel to reduce the stress on the motor, thus minimizing its size. During focusing, the user observes the video in real-time. Focusing is complete when a large number of densely moving particles appear in the video. Real-time video is generated by the main camera and the GPU video module on the motherboard and transmitted to the ground via Ethernet. The user can also adjust the brightness of the light-emitting platform group during focusing. The side-view camera captures and transmits real-time video of the wellbore during the equipment's descent, allowing the user to know whether the equipment has reached the monitoring well's perforated pipe position, as this is the observation position of the main camera. The difference between this device and some current products lies in its improved object distance clarity and focal length adjustment. Some current devices use groundwater as the medium between the objective lens end face and the focal plane, resulting in blurred observations and the inability to eliminate the influence of moving particles. This device features a quartz glass lens with a raised section, allowing water to flow only through the gap. This ensures that the medium between the objective lens end face and the focal plane is quartz, providing a clear image input to the algorithm. The focal length adjustment function, achieved by a motor driving the lens barrel up and down, is also different from other products, as other products directly observe water, eliminating the need for focal plane adjustment (also because they lack optimized object distance).

[0054] In one embodiment, the above-ground components include a communication control unit U6 (automatic lifting device), a control console U7, a communication control unit U8 (well-washing pump power supply), a remotely controllable electrical box U9, and a DC switching power supply U10; and the below-ground components include an expansion packer U1 (below) and an expansion packer U2 (above), other instruments U3 (such as the sampling end of a sampling device), a flow velocity and direction meter U4, and a well-washing pump U5.

[0055] Based on the above embodiments, the operation process of this device is as follows:

[0056] (1) System self-test, mainly checks the communication status. After the self-test is successful, execute (2);

[0057] ① Purpose: To ensure that all sub-components of the system are in normal working order.

[0058] ②Logic: The ground control console acts as the central control point, scheduling each sub-component and receiving correct responses from the sub-components to confirm that the interconnection status is normal.

[0059] (2) After receiving instructions from the remote computer, the ground control console (U7) sends control commands to U6, and U6 parses the commands and executes the movement of the mechanism.

[0060] ① Purpose: Command U6 to raise or lower the monitoring and detection system to the specified depth.

[0061] ② Logic: U6 parses the received commands and, based on the parsing results, drives its own motor to move some spools to let out or retract the wire. The length of the wire let out can be calculated using information such as rotation speed and time. This value is then fed back to U7, where the displacement value is displayed in real time on the U7's GUI interface, indicating the current position of the monitoring device.

[0062] (3) U7 sends an instruction to U4, U4 parses the instruction, and then sends instructions to U1 and U2, causing the expansion mechanisms of U1 and U2 to move.

[0063] ① Purpose: This step is when the expansion packer starts working. There are two expansion packers, one at the top and one at the bottom of the entire detection and monitoring system. Their function is to place the system in an aquifer, isolate it from other aquifers (prevent water from other aquifers from entering), and carry out detection and monitoring activities in this state.

[0064] ② Logic: In the current system, U7 cannot directly control U1 and U2, but U7 and U4 can communicate. Since U4 is connected to both U1 and U2 on the communication bus, U1 and U2 are controlled through U7-U4. U1 and U2 are driven by stepper motors for expansion movement. During operation, multiple pulses are sent to U1, each pulse driving one step. At the same time, U1 feeds back the force status to U4 (U1 and U2 have built-in pressure transmitters). U1 will move slowly. When the pressure reaches a certain value (this value is the effective value of the expansion seal measured by experiment), pulses are stopped being sent to U1. U2 is controlled in the same way. The entire control process is a fine-tuning process.

[0065] (4) The flow velocity and direction meter monitors the water flow, starts recording, and calculates the flow velocity and direction:

[0066] ①Purpose: The velocity and direction meter is used to observe the velocity and direction of groundwater at a specific point.

[0067] ②Logic: Through the U7 GUI, the focal length and light field intensity of the velocity and direction meter are first adjusted. After observing moving particles, the two parameter values ​​are saved. The script program on the U4 velocity and direction meter system will capture video streams and use image processing and analysis technology to calculate flow velocity and direction data in real time, and display them on the GUI interface.

[0068] (5) At the same time, this system can be equipped with other groundwater index detection instruments, and the data of these instruments are transmitted back to the GUI interface via bus and U4.

[0069] ① Purpose: Functional expansion.

[0070] ②Logic: This system supplies power to other instruments and provides bus connections, while also providing a detection environment isolated from the aquifer.

[0071] It should be noted that the above describes the working process of one aquifer, and the following describes the working process of moving to another aquifer.

[0072] (1) U1, U2 shrink and unload

[0073] ① Purpose: To release the expansion seal so that the entire structure can move to the next aquifer.

[0074] ③ Logic: In the current system, U7 cannot directly control U1 and U2, but U7 and U4 can communicate. Since U4 is connected to both U1 and U2 on the communication bus, U1 and U2 are controlled through U7-U4. U1 and U2 are driven by stepper motors for contraction. During operation, multiple pulses are sent to U1, each pulse driving one step. At the same time, U1 feeds back the force status to U4 (U1 and U2 have built-in pressure transmitters). U1 will move slowly. When the pressure reaches a certain value (this value is the effective value of expansion seal unloading measured by test), pulses are stopped being sent to U1. The unloading movement of U2 is controlled in the same way.

[0075] (2) After receiving instructions from the remote computer, the ground control console (U7) sends control commands to U6, and U6 parses the commands and executes the movement of the mechanism.

[0076] ① Purpose: Command U6 to raise or lower the monitoring and detection system to the specified depth.

[0077] ②U6 parses the received commands and, based on the parsing results, drives its own motor to move some spools to let out or take in the wire. The length of the wire let out can be calculated using information such as rotation speed and time. This value is then fed back to U7, where the displacement value is displayed in real time on the U7's GUI interface, indicating the current position of the monitoring equipment.

[0078] Then repeat steps (3)-(4)-(5).

[0079] In one embodiment, a groundwater detection method, applied to the groundwater detection equipment of any of the above embodiments, includes the following steps:

[0080] The onshore device is activated to extend and retract the connection end, thereby releasing the expansion packer to the specified depth.

[0081] When the expansion packer is released to a certain depth underground, the expansion packer is activated and its edges expand to abut against the inner wall of the monitoring well casing, thus completing the isolation of the internal space of the monitoring well casing.

[0082] The flow velocity and direction meter was activated to monitor the groundwater within the two expansion packers.

[0083] The sampling device samples groundwater at the current depth and samples groundwater again after the depth changes. Each sample is input into a master sampling box and another new sampling box.

[0084] The aforementioned groundwater detection method involves activating the onshore device to extend and retract the connection end, releasing the expansion packer to a designated depth. Once the packer reaches a certain depth, it is activated, causing its edges to expand and press against the inner wall of the monitoring well, effectively isolating the internal space. A flow velocity and direction meter is then activated to monitor the groundwater within the two expansion packers. Simultaneously, a sampling device is activated to collect groundwater samples at the current depth, placing the samples into a main sampling box and a new sampling box. Subsequent sampling is performed each time the depth changes, with the sampled groundwater being transferred to both the main sampling box and the new sampling box. This method employs stratified sampling and combined testing. During operation, a frequency converter valve can be used for static sampling, while a filter and electric ball valve can be used for equal-volume mixing and neutralization testing. This avoids the need for multiple sampling attempts and improves the effectiveness of combined testing at different depths.

[0085] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A groundwater detection device, characterized in that, include: The onshore device is installed at the top of the monitoring well pipe, with the connection end extending into the monitoring well pipe; Two expansion packers, with their central axes overlapping and symmetrically arranged inside the monitoring well pipe, are used to seal the inner wall of the monitoring well pipe. The expansion packers are connected to the connection end of the onshore device. A flow velocity and direction meter, located between the two expansion packers, is used to detect groundwater. A sampling device is installed outside the monitoring well pipe. The sampling end of the sampling device is located between the two expansion packers and moves with the movement of the onshore device connection end. The expansion packer includes a cylinder, a first sealing ring, a flange, a crescent-shaped rod, a cross arm, a lifting ring, and a silicone sleeve. The first sealing ring and the flange are sequentially installed at one end of the cylinder, and a lifting ring is movably installed at the other end. Multiple sets of connectors are arranged in a circular array on the surface of the cylinder. Each set of connectors includes a lug and a latch. Multiple sets of crescent-shaped rods are arranged in a circular array. Two crescent-shaped rods in the same set have one end rotatably mounted on the lug and the latch, respectively, and the other ends of the two crescent-shaped rods are hinged together. A cross arm is inserted laterally into each crescent-shaped rod. The silicone sleeve is fitted onto the crescent-shaped rod and the cross arm, with one end of the silicone sleeve clamped between the first sealing ring and the flange.

2. The groundwater detection equipment according to claim 1, characterized in that, The onshore device includes a mounting frame, fishing reels, driven gears, and a drive gear. The mounting frame is located at the inlet of the monitoring well pipe. Multiple fishing reels are arranged in a circular array and rotatably mounted on the side of the mounting frame. A steel wire rope is wound around each fishing reel, with one end of the steel wire rope extending into the monitoring well pipe. Each fishing reel has a driven gear mounted at one end. The drive gear is rotatably mounted on the top of the mounting frame, and the bottom surface of the drive gear meshes with the multiple driven gears.

3. The groundwater detection equipment according to claim 2, characterized in that, The onshore device also includes a collar, guide tubes, a fixing plate, and a servo motor. The collar is fitted onto the top of the monitoring well pipe. Multiple guide tubes are arranged in a ring array and fixed to the collar. One end of the steel wire rope extends into the monitoring well pipe and passes through the guide tube. The fixing plate is fitted onto the top of the mounting frame. The servo motor is mounted on the fixing plate and connected to the motor drive module. The drive end of the servo motor meshes with the top of the drive gear plate.

4. The groundwater detection equipment according to claim 3, characterized in that, The silicone sleeve includes two thin sleeve portions and one thickened portion. The two thin sleeve portions are located at the two ends of the thickened portion, one thin sleeve portion is clamped between the first sealing pressure ring and the flange edge, and the other thin sleeve portion is fixed on the lifting ring. The thickened portion abuts against the recessed area formed at the connection of the two crescent-shaped rods.

5. The groundwater detection equipment according to claim 4, characterized in that, The top of the cylinder is open, and the bottom of the cylinder is closed. A pressure sensor is installed at the bottom of the cylinder, and a cable outlet is installed on the side of the cylinder. The cable outlet is used to thread a wire and is connected to the pressure sensor.

6. The groundwater detection equipment according to claim 5, characterized in that, The expansion packer is equipped with a motor drive unit at one end, which includes a second sealing ring, a housing, a stepper motor, a top support, a motor drive plate, and a connector. The second sealing ring is fixed to the bottom end of the cylinder. The housing is installed on one side of the second sealing ring, and a silicone pad is provided on the other side of the housing. The stepper motor is located inside the housing. A top support is installed on the lead screw at one end of the stepper motor, and a lead screw corrugated sleeve is fitted on the lead screw at that end. The lead screw at the other end of the stepper motor passes through the motor drive plate, and the connector is located between two adjacent motor drive plates.

7. The groundwater detection equipment according to claim 6, characterized in that, The flow velocity and direction meter includes a frame assembly, a main body component, a panel assembly, and a rod lens assembly. The main body component is located within the frame assembly, the panel assembly is located at one end of the frame assembly and is used for laying pipelines, and the rod lens assembly is located at the other end of the frame assembly and is used for monitoring groundwater.

8. The groundwater detection equipment according to claim 7, characterized in that, The rod lens assembly includes a plug, a three-pronged tail cap, a spacer, an LED plate, a sealing ring, a light guide plate assembly, an eyepiece micrometer scale plate, a lampshade, a fixing ring, and a quartz glass lens arranged sequentially from one end to the other.

9. A groundwater detection method, applied to the groundwater detection equipment according to any one of claims 1 to 8, characterized in that, The method includes: The onshore device is activated to extend and retract the connection end, thereby releasing the expansion packer to the specified depth; When the expansion packer is released to a certain depth underground, the expansion packer is activated and its edge expands to abut against the inner wall of the monitoring well pipe, thus completing the isolation of the internal space of the monitoring well pipe. The flow velocity and direction meter was activated to monitor the groundwater within the two expansion packers; The sampling device samples groundwater at the current depth and samples groundwater again after the depth changes. Each sample is input into a master sampling box and another new sampling box.

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