Underground water detection equipment and detection method thereof

Abstract

The invention relates to the field of underground water detection, in particular to underground water detection equipment and a detection method thereof. Comprising an ashore device, two expansion plugging devices, a flow velocity and flow direction instrument and a sampling device, the ashore device is installed at the top end of the monitoring well pipe, and the connecting end extends into the monitoring well pipe. The central axes of the two expansion packers coincide, and the two expansion packers are symmetrically arranged in the monitoring well pipe and used for conducting attached plugging on the inner wall of the monitoring well pipe, and the expansion packers are connected with the connecting ends of the ashore device. The flow velocity and flow direction instrument is located between the two expansion packers and used for detecting underground water. The sampling device is arranged outside the monitoring well casing, and the sampling end of the sampling device is located between the two expansion packers. Stratified sampling and matched detection are adopted, static sampling can be carried out in cooperation with a frequency conversion valve during use, equivalent matching and neutralization detection can be carried out in cooperation with a filter screen and an electric ball valve, and the matching detection effect of samples at different depths is improved while the problem of multiple times of underwater sampling is solved.

Description

Technical Field

[0001] The present invention relates to the field of groundwater detection, and particularly to a groundwater detection device and a detection method thereof. Background Art

[0002] In order to rationally 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 location, it can be divided into in-situ detection and ex-situ detection. The in-situ detection has great technical difficulty, and the ex-situ detection usually causes waste of time and preservation agents, and is very inconvenient when taking multiple groundwater samples, resulting in poor detection effects. Summary of the Invention

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

[0004] The present invention provides a groundwater detection device, including:

[0005] An onshore device, installed at the top of the monitoring well pipe, and the connection end extends into the monitoring well pipe;

[0006] Two expansion packers, with their central axes coinciding and symmetrically arranged in the monitoring well pipe, used to fit and seal the inner wall of the monitoring well pipe, and the expansion packers are connected to the connection end of the onshore device;

[0007] A flow velocity and direction meter, located between the two expansion packers, used to detect groundwater;

[0008] A sampling device, arranged 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 connection end of the onshore device.

[0009] In one embodiment, the onshore device includes a mounting frame, a fishing reel, a driven gear, and a driving gear disc; the mounting frame is arranged at the pipe orifice of the monitoring well pipe, a plurality of fishing reels are provided, the plurality of fishing reels are arranged in a circular array, and are rotatably mounted on the side surface of the mounting frame. A steel wire rope is wound around each fishing reel, and one end of the steel wire rope extends into the monitoring well pipe. Each driven gear is mounted at one end of each fishing reel, and the driving gear disc is rotatably mounted at the top end of the mounting frame, and the bottom surface of the driving gear disc is meshed and connected with the plurality of driven gears.

[0010] In one embodiment, the onshore device further includes a collar, a guiding pipe, a fixing disc, and a servo motor; the collar is sleeved on the top end of the monitoring well pipe, a plurality of guiding pipes are provided, the plurality of guiding pipes are arranged in a circular array, and are fixed on the collar. One end of the steel wire rope extending into the monitoring well pipe passes through the guiding pipe. The fixing disc is sleeved on the top end of the mounting frame, the servo motor is mounted on the fixing disc and is connected with the motor driving module, and the driving end of the servo motor is meshed and connected with the top end of the driving gear disc.

[0011] In one embodiment, the expansion packer includes a cylinder body, a first sealing pressing ring, a flange edge, a crescent-shaped bent rod, a cross arm, a lifting ring, and a silica gel sleeve; a first sealing pressing ring and a flange edge are sequentially mounted at one end of the cylinder body, and a lifting ring is movably mounted at the other end. A plurality of groups of connecting pieces are arranged in a circular array on the surface of the cylinder body, and each group of connecting pieces includes a hanging ear and a fastening buckle. A plurality of groups of crescent-shaped bent rods are arranged in a circular array. One end of two crescent-shaped bent rods in the same group is respectively rotatably mounted on the hanging ear and the fastening buckle, and the other ends of the two crescent-shaped bent rods are hinged. A cross arm is horizontally inserted on each crescent-shaped bent rod, and the silica gel sleeve is sleeved on the crescent-shaped bent rods and the cross arms, and one end of the silica gel sleeve is clamped between the first sealing pressing ring and the flange edge.

[0012] In one embodiment, the silica gel sleeve includes two thin sleeve parts and a thickening part. The two thin sleeve parts are respectively located at both ends of the thickening part. One thin sleeve part is clamped between the first sealing pressing ring and the flange edge, and the other thin sleeve part is fixed on the lifting ring. The thickening part abuts against the concave area formed at the connection of the two crescent-shaped bent rods.

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

[0014] In one embodiment, a motor driving member is provided at one end of the expansion packer. The motor driving member includes a second sealing pressure ring, a housing, a stepper motor, a top pier, a motor driving plate, and a connector. The second sealing pressure ring is fixed to the bottom end of the cylinder body. The housing is installed on one side of the second sealing pressure ring. A silica gel pad is provided on the other side of the housing. The stepper motor is located inside the housing. A top pier is installed on the lead screw at one end of the stepper motor, and a lead screw corrugated sleeve is sleeved on the lead screw at this end. The lead screw at the other end of the stepper motor passes through the motor driving plate, and the connector is located between two adjacent motor driving plates.

[0015] In one embodiment, the flow velocity and flow direction meter includes a general frame group, a main body component, a panel group, and a rod mirror group. The main body component is located inside the general frame group. The panel group is located at one end of the general frame group and is used for threading pipelines. The rod mirror group is located at the other end of the general frame group and is used for monitoring groundwater.

[0016] In one embodiment, the rod mirror group includes a plug, a three-way tail cover, a spacer column, an LED board, a sealing ring, a light guide plate assembly, an eyepiece micrometer scale piece, a lamp shade, a fixed pressure ring, and a quartz glass lens, which are arranged in sequence from one end to the other end.

[0017] The present invention also provides a groundwater detection method, which is applied to the groundwater detection device described in any one of the above embodiments. The method includes:

[0018] Start the onshore device to retract and release the connection end, so as to release the expansion packer to a specified depth.

[0019] When the expansion packer is released to a certain depth underground, start the expansion packer and make the edge of the expansion packer expand and abut against the inner wall of the monitoring well pipe to complete the partition of the internal space of the monitoring well pipe.

[0020] Start the flow velocity and flow direction meter to monitor the groundwater in the two expansion packers.

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

[0022] The above-mentioned groundwater detection equipment and its detection method, when in use, start the onshore device to retract and extend the connection end, so as to release the expansion packer to the specified depth. When the expansion packer is released to a certain depth underground, start the expansion packer and make the edge of the expansion packer expand and abut against the inner wall of the monitoring well pipe, completing the partition of the internal space of the monitoring well pipe. Start the flow velocity and direction meter to monitor the groundwater in the two expansion packers. At this time, the sampling device can be started to sample the groundwater at the current depth, and the sampled groundwater is respectively put into the total sampling box and a new sampling box. After that, each time the depth is changed, the sampling device performs a sampling, and the sampled groundwater is respectively input into the total sampling box and another new sampling box. In order to ensure that the groundwater monitoring well can accurately locate and sample each aquifer in the case of multiple layers in one well, a video positioning method is used to identify the stratified flow field and perform stratified sampling and matching detection. When in use, it can cooperate with a variable frequency valve for static sampling, and cooperate with a filter screen and an electric ball valve for equal amount ratio and neutralization detection, avoiding the problem of sampling multiple times underwater and improving the matching detection effect of samples at different depths. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0024] Figure 1 FIG. 1 is a schematic three-dimensional structure diagram of the onshore device provided by the present invention;

[0025] Figure 2 FIG. 2 is a schematic three-dimensional structure diagram of the onshore device provided by the present invention;

[0026] Figure 3 FIG. 3 is a schematic three-dimensional structure diagram of the expansion packer provided by the present invention;

[0027] Figure 4 FIG. 4 is a schematic cross-sectional structure diagram of the expansion packer provided by the present invention;

[0028] Figure 5 FIG. 5 is a schematic structure diagram of the motor driving member provided by the present invention;

[0029] Figure 6 FIG. 6 is a schematic structure diagram of the motor driving member provided by the present invention;

[0030] Figure 7 FIG. 7 is a schematic three-dimensional structure diagram of the flow velocity and direction meter provided by the present invention;

[0031] Figure 8Schematic diagram of the split structure of the rod lens group provided by the present invention.

[0032] Reference numerals:

[0033] 10. Monitoring well pipe; 110. Mounting rack; 120. Fishing reel; 130. Driven gear; 141. Collar; 142. Guide pipe; 150. Steel wire rope; 160. Fixed disk; 170. Driving gear disk; 180. Servo motor; 190. Motor drive module; 210. Cylinder; 221. First sealing pressure ring; 222. Flange edge; 231. Hanging ear; 232. Climbing buckle; 240. Crescent-shaped bent rod; 250. Cross arm; 260. Lifting ring; 271. Thin sleeve part; 272. Thickening part; 281. Pressure sensor; 282. Outlet pipe; 310. Machine shell; 320. Second sealing pressure ring; 330. Stepper motor; 340. Top pier; 350. Screw rod corrugated sleeve; 360. Silicone pad; 370. Screw rod; 380. Motor drive board; 390. Connector; 410. Total frame group; 420. Main body component; 430. Panel group; 440. Rod lens group; 441. Plug; 442. Trident tail cover; 443. Spacer column; 444. LED board; 445. Sealing ring; 446. Light guide plate assembly; 447. Lamp shade; 448. Eyepiece micrometer scale piece; 449. Fixed pressure ring; 4410. Quartz glass lens. Detailed implementation manners

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] The following combines Figures 1 to 8 to describe a groundwater detection device and its detection method of the present invention.

[0036] In one embodiment, a groundwater detection device includes an onshore device, two expansion plugging devices, a flow velocity and direction meter, and a sampling device; the onshore device is installed at the top end of the monitoring well pipe 10, and the connection end extends into the monitoring well pipe 10; the central axes of the two expansion packers coincide and are symmetrically arranged in the monitoring well pipe 10 for tightly sealing the inner wall of the monitoring well pipe 10, and the expansion packers are connected to the connection end of the onshore device; the flow velocity and direction meter is located between the two expansion packers for detecting groundwater; the sampling device is arranged outside the monitoring well pipe 10, and the sampling end of the sampling device is located between the two expansion packers and moves with the movement of the connection end of the onshore device.

[0037] Specifically, when in use, start the onshore device to retract and extend the connection end, so as to release the expansion packer to a specified depth. When the expansion packer is released to a certain depth underground, start the expansion packer and make the edge of the expansion packer expand and abut against the inner wall of the monitoring well pipe 10, completing the partition of the internal space of the monitoring well pipe 10. Start the flow velocity and direction meter to monitor the groundwater in the two expansion packers. At this time, the sampling device can be started to sample the groundwater at the current depth, and the sampled groundwater is respectively put into the total sampling box and a new sampling box. After that, each time the depth is changed, the sampling device performs a sampling, and the sampled groundwater is respectively input into the total sampling box and another new sampling box.

[0038] For the above groundwater detection equipment, when in use, start the onshore device to retract and extend the connection end, so as to release the expansion packer to a specified depth. When the expansion packer is released to a certain depth underground, start the expansion packer and make the edge of the expansion packer expand and abut against the inner wall of the monitoring well pipe 10, completing the partition of the internal space of the monitoring well pipe 10. Start the flow velocity and direction meter to monitor the groundwater in the two expansion packers. At this time, the sampling device can be started to sample the groundwater at the current depth, and the sampled groundwater is respectively put into the total sampling box and a new sampling box. After that, each time the depth is changed, the sampling device performs a sampling, and the sampled groundwater is respectively input into the total sampling box and another new sampling box. In order to ensure that the groundwater monitoring well can accurately locate and sample each aquifer in the case of multiple layers in one well, a video positioning method is adopted to identify the stratified flow field and perform stratified sampling and matching detection. When in use, it can cooperate with a variable frequency valve for static sampling, and be equipped with a filter screen and an electric ball valve for equal amount ratio and neutralization detection, avoiding the problem of sampling underwater multiple times and improving the detection effect of sample matching at different depths.

[0039] In one embodiment, the onshore device includes a mounting frame 110, a fishing reel 120, a driven gear 130 and a driving gear disk 170; the mounting frame 110 is arranged at the orifice of the monitoring well pipe 10, there are multiple fishing reels 120, the multiple fishing reels 120 are arranged in a circular array and are 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 at one end of each fishing reel 120, and the driving gear disk 170 is rotatably mounted at the top of the mounting frame 110, and the bottom surface of the driving gear disk 170 is meshed and connected with the multiple driven gears 130.

[0040] Specifically, the onshore device further includes a collar 141, a guide pipe 142, a fixing plate 160, and a servo motor 180; the collar 141 is sleeved on the top end of the monitoring well pipe 10, there are multiple guide pipes 142, the multiple guide pipes 142 are arranged in a circular array and fixed on the collar 141, and one end of the wire rope 150 extending into the monitoring well pipe 10 passes through the guide pipe 142. The fixing plate 160 is sleeved on the top end of the mounting frame 110, the servo motor 180 is installed on the fixing plate 160 and connected to the motor drive module 190, and the drive end of the servo motor 180 is meshed and connected to the top end of the drive gear disc 170.

[0041] During use, the servo motor 180 starts and drives the drive gear disc 170 to rotate, thereby driving the multiple fishing reels 120 to rotate. The rotating fishing reels 120 will wind and unwind the wire rope 150 wound thereon, thereby releasing the expansion packer to a specified depth.

[0042] In one embodiment, the expansion packer includes a cylinder body 210, a first sealing compression ring 221, a flange 222, a crescent-shaped bent rod 240, a cross arm 250, a lifting ring 260, and a silica gel sleeve; one end of the cylinder body 210 is sequentially installed with the first sealing compression ring 221 and the flange 222, and the other end is movably installed with the lifting ring 260. Multiple groups of connecting pieces are arranged in a circular array on the surface of the cylinder body 210, and each group of connecting pieces includes a hanging ear 231 and a clasp 232. Multiple groups of crescent-shaped bent rods 240 are arranged in a circular array. One end of the two crescent-shaped bent rods 240 in the same group is respectively rotatably installed on the hanging ear 231 and the clasp 232, and the other ends of the two crescent-shaped bent rods 240 are hinged. A cross arm 250 is horizontally inserted on each crescent-shaped bent rod 240, and the silica gel sleeve is sleeved on the crescent-shaped bent rods 240 and the cross arms 250, and one end of the silica gel sleeve is clamped between the first sealing compression ring 221 and the flange 222.

[0043] Specifically, in the normal state, both ends of the crescent-shaped bent rod 240 are attached to the cylinder body 210, the middle of the crescent-shaped bent rod 240 is bent away from the cylinder body 210, and the silica gel sleeve is partially sleeved on the crescent-shaped bent rod 240. When the lifting ring 260 moves along the direction of the cylinder body 210, the far ends of the two mutually hinged crescent-shaped bent rods 240 will approach each other, so that the hinged part of the two crescent-shaped bent rods 240 moves away from the cylinder body 210, thereby pushing the silica gel sleeve to fit with the inner wall of the monitoring well pipe 10 to form a seal.

[0044] In one embodiment, the silica gel sleeve includes two thin sleeve parts 271 and one thickening part 272. The two thin sleeve parts 271 are respectively located at both ends of the thickening part 272. One thin sleeve part 271 is clamped between the first sealing compression ring 221 and the flange 222, and the other thin sleeve part 271 is fixed on the lifting ring 260. The thickening part 272 abuts against the concave area formed at the connection of the two crescent-shaped bent rods 240.

[0045] Specifically, the cross-section of the thickening part 272 is arranged in an elliptical structure, which can be effectively and stably clamped at the connection of the two crescent-shaped rods 240, and will not easily break away when the states of the two crescent-shaped rods 240 change.

[0046] In one embodiment, the top end of the cylinder 210 is arranged in an open structure, the bottom end of the cylinder 210 is closed, a pressure sensor 281 is arranged at the bottom end of the cylinder 210, and a wire outlet pipe 282 is also arranged on the side surface of the cylinder 210. The wire outlet pipe 282 is used for threading and is connected to the pressure sensor 281.

[0047] Specifically, a motor driving part is arranged at one end of the expansion packer. The motor driving part includes a second sealing pressing ring 320, a machine shell 310, a stepping motor 330, a top pier 340, a motor driving plate 380 and a connector 390. The second sealing pressing ring 320 is fixed at the bottom end of the cylinder 210. The machine shell 310 is installed on one side of the second sealing pressing ring 320. A silica gel pad 360 is arranged on the other side of the machine shell 310. The stepping motor 330 is located inside the machine shell 310. A top pier 340 is installed on a lead screw 370 at one end of the stepping motor 330. The top pier 340 faces the pressure sensor 281, and a lead screw corrugated sleeve 350 is sleeved on the lead screw 370 at this end. The lead screw 370 at the other end of the stepping motor 330 passes through the motor driving plate 380, and the connector 390 is located between two adjacent motor driving plates 380.

[0048] It should be noted that since the expansion packer is an auxiliary device, various detection instruments are arranged between two expansion packers, and the power supply and communication cables and water pipelines of these instruments must pass through the packer. Sometimes there are quite a lot of cables. At the same time, the packer functions to block the upper and lower layers of water in the well 441, so it itself also requires mechanisms and electronic control. In practice, the diameter of the monitoring well is not large. The advantage of this design is that it provides expansion while also providing enough space for threading; the middle part of the crescent-shaped rod 240 is concave, and the structure of the cross arm 250 and the surrounding framework are close to a circular surface, which is beneficial to laying a silica gel sleeve, that is, a silica gel skin on it. And through reasonable design of the protrusions and depressions of the skin, it is beneficial to form an O-ring when the framework expands, so as to fit well with the well wall and effectively prevent the up and down flow of water; the push rod is not connected to the pushing surface, but in contact, with silica gel in between, so that the silica gel can be conveniently and effectively designed to protect the motor, and there is no need to select a waterproof motor; the external controller sends signals to this device to control the lifting of the push rod of the motor, and stops the push rod from continuing to move and maintains it according to the feedback thrust.

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

[0050] Specifically, the rod lens group 440 includes a plug 441, a three-way end cap 442, a spacer column 443, an LED board 444, a sealing ring 445, a light guide plate assembly 446, an eyepiece micrometer scale piece 448, a lamp shade 447, a fixed retaining ring 449, and a quartz glass lens 4410 arranged in sequence from one end to the other end.

[0051] It should be noted that the flow velocity and direction meter calculates the movement speed of particles by photographing the particles (tracking particles) suspended in groundwater and uses an image recognition algorithm, and calculates the movement direction of the particles according to the reference direction.

[0052] Among them, a 1mm gap is reserved between the eyepiece micrometer scale piece 448 and the quartz lens after the rod lens group 440 is assembled. Several are provided outside the general frame group 410. The machine shell 310 is used to wrap the functional components and achieve waterproofing. Since the device works underwater and the water pressure can reach 0.3 Mpa, to ensure the normal operation of the electronic components of the device, the machine shell 310 needs to be sealed.

[0053] During use, the water flow passing through the gap between the eyepiece micrometer scale piece 448 and the quartz lens is focused. The focusing method is that the motor drives the lens barrel to move up and down. The lens barrel is subjected to a certain pulling force by three springs to reduce the force on the motor, thereby reducing the volume of the motor. During the process of controlling the focus, the user observes the video status in real time. When a large number of dense moving particles appear in the video, the focusing is completed. The real-time video is realized by the main camera and the GPU video module on the main board and transmitted to the ground through Ethernet. During the focusing process, the user can also adjust the light emission brightness of the light-emitting platform group. The side camera is used to collect and transmit the real-time wellbore video during the process of the device being lowered into the well, so that the user can understand whether the device has moved to the perforated pipe position of the monitoring well. Because this position is the observation position of the main camera. The difference between the design of this device and some current products lies in the clarification of the object distance and the adjustment function of the focal length. In some current devices, the medium between the objective lens end face and the focal plane is groundwater, which blurs the observation effect and cannot exclude the influence of particles moving up and down. This device is designed and processed with a convex quartz glass lens that only allows water flow to pass through the gap. In this way, the medium between the objective lens end face and the focal plane is quartz, which can provide a clear image for the algorithm; the focal length is adjusted by driving the lens barrel to move up and down by the motor, which is also different from other products because other products directly observe the water, and its focal plane does not need to be adjusted (also because its object distance is not optimized).

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

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

[0056] (1) System self-check, mainly checking the communication status. After the self-check is successful, (2) is executed;

[0057] ① Purpose: To ensure that the status of each sub-component of the system is normal.

[0058] ② Logic: The ground console serves as the overall control center, scheduling each sub-component and should receive the correct response from the sub-components to confirm that the interconnection status is normal.

[0059] (2) After the ground console (U7) directly or receives an instruction from a remote computer, it sends a control command to U6. U6 parses the command and executes the mechanism movement;

[0060] ① Purpose: To command U6 to lift the monitoring and detection system to a specified depth.

[0061] ② Logic: U6 parses the received command. According to the parsing result, it drives its own motor to drive some spools to unwind or wind the wire. The length of the unwound wire can be calculated based on information such as rotational speed and time. And this value is fed back to U7, and the displacement value is displayed in real time on the GUI interface of U7, that is, the current position of the detection and monitoring device.

[0062] (3) U7 sends an instruction to U4. U4 parses the instruction and then sends an instruction to U1 and U2, and the expansion mechanism of U1 and U2 moves

[0063] ① Purpose: This step is when the packers start to work. There are two packers, one at the upper part and one at the lower part of the entire detection and monitoring system. Its function is to place the system in an aquifer, isolate it from other aquifers (prevent the intrusion of water from other aquifers), and conduct detection and monitoring activities in this state.

[0064] ②Logic: Under the current system, U7 cannot directly control U1 and U2, but U7 and U4 can communicate, and U4 is connected to the communication bus with U1 and U2, so U1 and U2 are controlled by U7-U4; U1 and U2 are stepper motor driven expansion movements. During operation, multiple pulses are sent to U1, and each pulse drives one step. At the same time, U1 feeds back the force situation to U4 (U1U2 has a built-in pressure transmitter). U1 will move slowly. When the pressure reaches a certain value (this value is the effective value of the expansion seal measured by the test), stop sending pulses to U1, and control the movement of U2 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 shooting, and calculates the flow velocity and direction:

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

[0067] ②Logic: Through the U7 GUI, first adjust the focal length of the flow velocity and flow direction meter and the light field intensity. After observing the moving particles, save the two parameter values. The script program on the flow velocity and flow direction meter U4 system will shoot the video stream and use image processing and analysis technology to calculate the flow velocity and flow direction data in real time, and display it 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 through the bus and U4.

[0069] ①Purpose: Functional expansion.

[0070] ②Logic: This system supplies power to other instruments, provides bus connection, and provides an aquifer-isolated detection environment.

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

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

[0073] ①Purpose: To release the working state of the expansion isolation so as to move to the next aquifer as a whole.

[0074] ③Logic: Under the current system, U7 cannot directly control U1 and U2. However, U7 can communicate with U4, and U4, U1, and U2 are connected to the communication bus. Therefore, U1 and U2 are controlled through U7-U4. U1 and U2 drive the contraction movement of the stepper motor. During operation, multiple pulses are sent to U1, and each pulse drives one step. At the same time, U1 feeds back the force condition to U4 (pressure transmitters are built into U1 and U2). U1 will move slowly. When the pressure reaches a certain value (this value is the effective value of the expansion seal unloading measured by experiments), the pulse sending to U1 stops, and the unloading movement of U2 is controlled in the same way.

[0075] (2) The ground console (U7) directly or after receiving instructions from the remote computer, sends control commands to U6. U6 parses the commands and executes the mechanism movement;

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

[0077] ②U6 parses the received commands. According to the parsing results, it drives its own motor to drive some spools to unwind or wind the wire. The length of the unwound wire can be calculated based on information such as rotation speed and time. And this value is fed back to U7, and the displacement value is displayed in real time on the GUI interface of U7, that is, the current position of the detection and monitoring device.

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

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

[0080] Start the onshore device to take in and release the connection end, thereby releasing the expansion packer to the specified depth.

[0081] When the expansion packer is released to a certain depth underground, start the expansion packer and make the edge of the expansion packer expand and abut against the inner wall of the monitoring well pipe to complete the partition of the internal space of the monitoring well pipe.

[0082] Start the flow velocity and direction meter to monitor the groundwater in the two expansion packers.

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

[0084] In the above groundwater detection method, when in use, the onshore device is started to retract and release the connection end, so as to release the expansion packer to the specified depth. When the expansion packer is released to a certain depth underground, the expansion packer is started and the edge of the expansion packer expands to abut against the inner wall of the monitoring well pipe, completing the partition of the internal space of the monitoring well pipe. The flow velocity and direction meter is started to monitor the groundwater in the two expansion packers. At this time, the sampling device can be started to sample the groundwater at the current depth, and the sampled groundwater is respectively put into the total sampling box and a new sampling box. After that, each time the depth is changed, the sampling device performs a sampling, and the sampled groundwater is respectively input into the total sampling box and another new sampling box. Stratified sampling and combined detection are adopted. When in use, static sampling can be carried out in cooperation with a variable frequency valve, and equal amount ratio and neutralization detection are carried out in cooperation with a filter screen and an electric ball valve, avoiding the problem of sampling underwater multiple times and improving the combined detection effect of samples at different depths.

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

[0086] The above-described embodiments only represent several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be understood as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A groundwater detection device, characterized in that: include: The onshore device is installed on the top of the monitoring well pipe, and the connection end extends into the monitoring well pipe; Two expansion packers, with their central axes overlapping and symmetrically arranged in the monitoring well pipe, are used to fit and seal the inner wall of the monitoring well pipe, and the expansion packers are connected to the connecting end of the onshore device; A flow velocity and direction meter, located between the two expansion packers, for detecting groundwater; The sampling device is arranged outside the monitoring well pipe, and the sampling end of the sampling device is located between the two expansion packers and moves with the movement of the connecting end of the onshore device.

2. The groundwater detection device according to claim 1, characterized in that: The onshore device includes a mounting frame, a fishing reel, a driven gear and a driving sprocket; the mounting frame is arranged at the pipe mouth of the monitoring well pipe, and a plurality of the fishing reels are provided. The plurality of fishing reels are arranged in a ring array and are rotatably mounted on the side of the mounting frame. A steel wire rope is wound around the fishing reel, and one end of the steel wire rope extends into the monitoring well pipe. The driven gear is installed at one end of each of the fishing reels, and the driving sprocket is rotatably mounted on the top of the mounting frame, and the bottom surface of the driving sprocket is meshed and connected with the plurality of driven gears.

3. The groundwater detection device according to claim 2, characterized in that: The onshore device also includes a collar, a guide tube, a fixed disk and a servo motor; the collar is sleeved on the top of the monitoring well pipe, and a plurality of guide tubes are provided, and the plurality of guide tubes are arranged in a circular array and fixed on the collar, and one end of the wire rope extending into the monitoring well pipe passes through the guide tube, and the fixed disk is sleeved on the top of the mounting frame, and the servo motor is installed on the fixed disk and connected to the motor drive module, and the driving end of the servo motor is meshed and connected with the top of the driving gear disk.

4. The groundwater detection device according to claim 3, characterized in that: The expansion packer includes a cylinder, a first sealing pressure ring, a flange, a crescent-shaped rod, a cross arm, a lifting ring and a silicone sleeve; the first sealing pressure ring and the flange are sequentially installed at one end of the cylinder, and a lifting ring is movably installed at the other end; a plurality of groups of connecting parts are arranged in a circular array on the surface of the cylinder, and each group of the connecting parts includes a hanging ear and a climbing buckle; a plurality of groups of crescent-shaped rods are arranged in a circular array, and one end of two crescent-shaped rods in the same group are rotatably installed on the hanging ear and the climbing buckle respectively, and the other ends of the two crescent-shaped rods are hinged; a cross arm is horizontally inserted on each of the crescent-shaped rods; the silicone sleeve is arranged on the crescent-shaped rod and the cross arm, and one end of the silicone sleeve is clamped between the first sealing pressure ring and the flange.

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

6. The groundwater detection device according to claim 5, characterized in that: The top of the cylinder is in an open structure, and the bottom of the cylinder is closed. A pressure sensor is arranged at the bottom of the cylinder. A wire outlet tube is also arranged on the side of the cylinder. The wire outlet tube is used for threading and is connected to the pressure sensor.

7. The groundwater detection device according to claim 6, characterized in that: A motor drive is provided at one end of the expansion packer, and the motor drive includes a second sealing pressure ring, a casing, a stepper motor, a top pier, a motor drive board and a connector; the second sealing pressure ring is fixed at the bottom end of the cylinder, the casing is installed on one side of the second sealing pressure ring, a silicone pad is provided on the other side of the casing, the stepper motor is located in the casing, a top pier is installed on the screw rod at one end of the stepper motor, and a screw rod corrugated sleeve is provided on the screw rod at this end, the screw rod at the other end of the stepper motor is penetrated through the motor drive board, and the connector is located between two adjacent motor drive boards.

8. The groundwater detection device according to claim 7, characterized in that: The flow velocity and direction meter includes a main frame group, a main body component, a panel group and a rod mirror group; the main body component is located inside the main frame group, the panel group is located at one end of the main frame group and is used for laying pipelines, and the rod mirror group is located at the other end of the main frame group and is used for monitoring groundwater.

9. The groundwater detection device according to claim 8, characterized in that: The rod mirror assembly comprises a plug, a three-fork tail cover, a spacer column, an LED board, a sealing ring, a light guide plate assembly, an eyepiece micrometer scale sheet, a lampshade, a fixed pressure ring and a quartz glass lens which are arranged in sequence from one end to the other.

10. A groundwater detection method, applied to the groundwater detection device according to any one of claims 1 to 9, characterized in that: The method comprises: Start the onshore device to retract and release 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 started and the edge of the expansion packer expands and abuts against the inner wall of the monitoring well pipe, thereby completing the isolation of the internal space of the monitoring well pipe; Start the flow velocity and direction meter to monitor the groundwater in the two expansion packers; The sampling device samples the groundwater at the current depth and samples the groundwater again after the depth is changed, and each sampling is input into a total sampling box and another new sampling box.

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