Towed land multi-channel direct current resistivity survey system

Abstract

The application discloses a kind of towed land multi-channel direct current resistivity exploration systems, including mobile platform and several towed electrodes connected with mobile platform;The towed electrode includes two power supply electrodes and at least one set of exploration electrode arranged as dipole-dipole device with power supply electrode, all towed electrodes are connected with mobile platform according to fixed arrangement spacing, and all towed electrodes are moved as a whole on the exploration ground by mobile platform;All towed electrodes are electrically connected with the multi-channel direct current resistivity acquisition host set on mobile platform through multi-channel large cable;It also includes active water supply device for improving the conductivity between towed electrode and exploration ground.The application uses active water supply device and towed electrode design, realizes the non-punching electrode power supply and potential measurement for land embankment, highway and other flat ground, effectively improves the problem of low data acquisition efficiency of traditional high-density resistivity method.

Description

TECHNICAL FIELD

[0001] The application discloses a dragging type land multi-channel direct current resistivity exploration system and belongs to the field of electric prospecting, in particular to parallel collection of direct current resistivity data in a flat ground grounding environment such as a dam or a highway. BACKGROUND

[0002] In the prior art, when high-density direct current resistivity technology is used for electric prospecting, grounding electrodes or a capacitive coupling mode is used to supply power to the underground and measure the potential. The method of driving grounding electrodes is destructive to the working environment and is not suitable for environments such as a dam or a highway that have been completed, and the working efficiency is low. After collecting data in one area, the electrodes need to be removed and then the next exploration area needs to be installed and constructed, so that continuous and rapid data collection cannot be realized. In addition, due to the expansion capability of the observation system, multiple large cables and electrodes need to be laid to complete the measurement of the entire working area. The capacitive coupling mode cannot realize large current power supply, is more sensitive to external electromagnetic interference, has poor anti-interference ability, has low coupling capacity, and is difficult to generate sufficient electric field response in deep strata, so that the data quality and exploration depth are greatly limited. SUMMARY

[0003] The application solves the technical problem of low efficiency of electric prospecting by driving fixed grounding electrodes, and provides a dragging type land multi-channel direct current resistivity exploration system.

[0004] The application adopts the following technical scheme:

[0005] The dragging type land multi-channel direct current resistivity exploration system comprises a mobile platform 3 and a plurality of dragging electrodes 4 connected with the mobile platform 3. The dragging electrodes 4 comprise two power supply electrodes and at least one group of exploration electrodes arranged in a dipole-dipole device with the power supply electrodes. All the dragging electrodes 4 are connected with the mobile platform 3 in a fixed arrangement interval and are dragged by the mobile platform 3 to move integrally on the exploration ground. All the dragging electrodes 4 are electrically connected with a multi-channel direct current resistivity acquisition host 1 arranged on the mobile platform 3 through a multi-channel large cable. The system further comprises an active water supply device 2 for improving the conductivity between the dragging electrodes 4 and the exploration ground.

[0006] In the dragging type land multi-channel direct current resistivity exploration system, all the dragging electrodes 4 are connected with a multi-channel large cable 5, and the multi-channel large cable 5 is internally integrated with lines electrically connected with the electrodes. All the dragging electrodes 4 are connected with the mobile platform 3 through the multi-channel large cable 5.

[0007] In the towed onshore multi-channel DC resistivity exploration system of the present invention, the towed electrode 4 is further provided with a cable through hole 403 for the multi-channel cable 5 to pass through. The inner wall of the cable through hole 403 is provided with an electrode spring 402 that is electrically connected to the internal circuit of the multi-channel cable 5. The multi-channel cable 5 is fixedly passed through the cable through hole 403 of the towed electrode 4 and is electrically connected to the towed electrode through the electrode spring 402, thus realizing both physical and electrical connection between the towed electrode and the multi-channel cable.

[0008] In the towed onshore multi-channel DC resistivity exploration system of the present invention, the towed electrode 4 is further characterized by being detachably spliced ​​by spliced ​​electrode bodies 41 symmetrically arranged along the axial direction of the large cable through hole, thereby improving the maintainability of the electrode.

[0009] In the towed onshore multi-channel DC resistivity exploration system of the present invention, the towed electrode 4 is further described as an ellipsoidal or spindle electrode with small ends and a large middle, and the electrode surface is provided with a wear-resistant conductive coating.

[0010] In the drag-and-drop onshore multi-channel DC resistivity exploration system of the present invention, the multi-channel DC resistivity acquisition host 1 is further equipped with a differential GPS positioning module 101.

[0011] As a preferred embodiment of the towed onshore multi-channel DC resistivity exploration system of the present invention, the active water supply device 2 includes a water tank 21 and a water distribution seat 22. The water tank 21 is set on the mobile platform 3, and a multi-hole water outlet valve 211 is provided at the bottom of the water tank. The water distribution seat 22 is connected to the multi-hole water outlet valve 211, and multiple water inlets on the water distribution seat are connected to multiple outlets of the multi-hole water outlet valve 211 one by one. The water distribution seat 22 is provided with a water curtain outlet 222 that discharges water to the ground. The width of the water curtain formed by the water curtain outlet 222 exceeds the lateral distribution range of all towed electrodes.

[0012] As another preferred embodiment of the towed onshore multi-channel DC resistivity exploration system of the present invention, the active water supply device 2 includes a water tank 21 and several electrode spraying units 23. The water tank 21 is set on the mobile platform 3. All the electrode spraying units 23 are towed and connected to the mobile platform 3 with the same fixed arrangement spacing as the towed electrodes, and correspond one-to-one with the towed electrodes. All the electrode spraying units 23 are nozzles 231 set on rollers 232. The nozzles 231 are connected to the water tank 21 through the connecting water pipe 24 to supply water and spray water toward the corresponding towed electrodes.

[0013] In the above-mentioned towed onshore multi-channel DC resistivity exploration system of the present invention, each towed electrode is further provided with two electrode water spraying units 23 symmetrically arranged on both sides. All electrode water spraying units 23 on the same side of the towed electrode are connected to the same connecting water pipe 24. The electrode water spraying units connected in series on both sides and the towed electrode connected in series in the middle are all connected to the tail trailer 6 at the end away from the moving platform.

[0014] In the towed onshore multi-channel DC resistivity exploration system of the present invention, the water tank 21 further contains a conductive brine solution.

[0015] The present invention, by adopting the above technical solution, has the following beneficial effects:

[0016] (1) This invention provides a novel drag-type multi-channel DC resistivity survey system for flat ground such as embankments and highways on land. It utilizes a mobile platform to drag all electrodes across the survey surface, employing drag-type electrodes that are smaller at both ends and larger in the middle. After surveying one area, the mobile platform moves all the drag-type electrodes to the next area, enabling continuous, rapid, and accurate surveying of the surface. The drag-type electrodes are simultaneously connected to the mobile platform and the multi-channel DC resistivity acquisition host via a multi-channel cable, saving on wiring for the drag system. Surveying can be performed simply by controlling the mobile platform, making the operation simpler and the survey efficiency higher.

[0017] (2) This invention addresses the acquisition of electrical signals by dragging electrodes in contact with the exploration surface. It eliminates the need to drive the electrodes underground, thus avoiding damage to the leveled surface after construction and ensuring the integrity of the exploration surface. Simultaneously, by incorporating an active water supply device, the conductivity of the dragging electrode grounding is improved, enhancing the accuracy of ground electrical signal acquisition during electrode contact exploration and enabling continuous dragging acquisition of high-density DC resistivity on land.

[0018] (3) The present invention uses a multi-channel DC resistivity acquisition host with integrated differential GPS positioning module to realize high-density DC resistivity drag-and-drop data acquisition. By positioning the mobile platform in real time, the location of the acquisition point is accurately recorded during drag-and-drop data acquisition.

[0019] In summary, the draggable onshore multi-channel DC resistivity exploration system provided by this invention adopts an active water supply device and a draggable electrode design, realizing non-penetrating electrode power supply and potential measurement on flat ground such as onshore dikes and highways. Combined with differential GPS positioning and multi-channel data acquisition, it realizes draggable data acquisition of high-density DC resistivity of the exploration ground, effectively improving the problem of low data acquisition efficiency of traditional high-density resistivity methods, and providing technical support for flood control and inspection of dikes.

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the drag-and-drop onshore multi-channel DC resistivity exploration system in Example 1.

[0022] Figure 2 This is a schematic diagram of the water tank of the active water supply device in Embodiment 1.

[0023] Figure 3 This is a schematic diagram of the water distribution seat of the active water supply device in Embodiment 1.

[0024] Figure 4a , 4b These are schematic diagrams of the drag-type electrode in Example 1.

[0025] Figure 5 This is a schematic diagram of the multi-channel DC resistivity acquisition host in Example 1.

[0026] Figure 6 This is a schematic diagram of the multi-channel DC resistivity acquisition circuit in Example 1.

[0027] Figure 7 This is a schematic diagram of the drag-and-drop onshore multi-channel DC resistivity exploration system in Example 2.

[0028] Figure 8 This is a schematic diagram of the electrode spraying unit of the active water supply device in Embodiment 2.

[0029] Figure 9 This is a schematic diagram of the nozzle and roller of the electrode water spray unit in Example 2.

[0030] The diagram is labeled as follows: 1-Multi-channel DC resistivity acquisition host, 101-Differential GPS positioning module, 2-Active water supply device, 21-Water tank, 211-Multi-hole water outlet valve, 22-Water distribution seat, 221-Water inlet, 222-Water curtain outlet, 23-Electrode spraying unit, 231-Sprayer, 232-Roller, 233-Spraying connector, 24-Connecting water pipe, 3-Mobile platform, 4-Drag-away electrode, 41-Assembled electrode body, 401-Electrode screw hole, 402-Electrode spring, 403-Large cable through hole, 5-Multi-channel large cable, 6-Tail trailer. Detailed Implementation

[0031] Example 1

[0032] See Figure 1 The figure shows a specific implementation of the draggable onshore multi-channel DC resistivity exploration system of the present invention, which specifically includes a multi-channel DC resistivity acquisition host 1, an active water supply device 2, a mobile platform 3, a draggable electrode 4, and a multi-channel cable 5.

[0033] This embodiment uses a mobile platform 3 and sixteen sets of draggable electrodes connected to it as the main body of the exploration system. The mobile platform 3 is a mobile carrier carrying a multi-channel DC resistivity acquisition host 1, an active water supply device 2, and draggable electrodes 4. It can be implemented using a handcart or an electric drive trolley. In this embodiment, the draggable electrodes 4 include two power supply electrodes C and fourteen exploration electrodes P. Several exploration electrodes P and power supply electrodes C form a dipole-dipole device for simultaneous multi-channel acquisition. All draggable electrodes 4 are dragged and connected to the mobile platform 3 at fixed intervals. In this embodiment, after all draggable electrodes 4 are connected in series at equal intervals on the mobile platform 3, the mobile platform 3 drives all draggable electrodes 4 to move as a whole on the exploration surface. All draggable electrodes 4 are electrically connected to the multi-channel DC resistivity acquisition host 1 set on the mobile platform 3 through a multi-channel cable 5. The multi-channel DC resistivity acquisition host 1 has a multi-channel DC resistivity acquisition circuit inside, which performs multi-channel acquisition and processing of electrical signals from the exploration surface through the draggable electrodes. After completing the exploration of one ground area, the mobile platform directly moves all the draggable electrodes to the next area to achieve continuous exploration.

[0034] Furthermore, all draggable electrodes 4 are connected in series on a multi-channel cable 5. The multi-channel cable 5 is a multi-core cable with integrated wiring for electrical connections to each electrode. Simultaneously, all draggable electrodes 4 are connected to the mobile platform 3 via the multi-channel cable 5. The multi-channel cable 5, originating from the multi-channel DC resistivity acquisition host 1, is first clamped and fixed by a conduit clamp on the mobile platform 3 before extending to connect in series with the draggable electrodes 4. This avoids directly connecting the multi-channel cable 5 to the mobile platform 3 via the multi-channel DC resistivity acquisition host 1. In this embodiment, all draggable electrodes 4 are equally spaced on the multi-channel cable 5. The multi-channel cable 5 serves both as the cable connecting the draggable electrodes 4 to the multi-channel DC resistivity acquisition host 1 and as a drag rope connecting the draggable electrodes 4 to the mobile platform 3, avoiding the problem of excessive wiring during exploration.

[0035] See also Figure 5In this embodiment, the multi-channel DC resistivity acquisition host 1 incorporates a differential GPS positioning module 101 and a multi-channel high-speed acquisition card to achieve system positioning and data acquisition. The differential GPS positioning module 101 can accurately record the location of the acquisition point during drag-and-drop data acquisition. The acquisition program is controlled by an industrial control computer. The multi-channel DC resistivity acquisition host 1 is powered to the ground via an external DC high-voltage battery box through the drag-and-drop electrode 4. Internally, it measures the current through a high-stability sampling resistor. The multi-channel DC resistivity acquisition host 1 is fixedly installed on the mobile platform 3 and moves with the mobile platform 3. The multi-channel DC resistivity acquisition host has a multi-channel acquisition card that integrates a multi-channel DC resistivity acquisition circuit. It is electrically connected to the drag-and-drop electrode 4 through the multi-core lines in the multi-channel large cable 5. It performs acquisition control through real-time communication with the differential GPS positioning module 101 and achieves power supply to the ground by controlling the SiC full-bridge circuit. In this embodiment, the multi-channel DC resistivity acquisition host 1 uses the Nordage TPC6000-B101-C1 as an industrial control computer, the multi-channel acquisition card uses the ART USB5633-D, and the differential GPS positioning module 101 uses the Alpha 6 high-precision mapping GPS.

[0036] The multi-channel DC resistivity acquisition host 1 is electrically connected to the multi-channel large cable 5, such as... Figure 6 As shown, the two power supply electrodes C connected in series on the multi-channel cable 5 are connected to the low-frequency high-voltage power supply on the multi-channel DC resistivity acquisition host to form a circuit, supplying power to the exploration surface. The remaining fourteen exploration electrodes P are connected to the power supply electrodes C via dipole-dipole wiring. The multi-channel cable 5 contains sixteen core wires. The two core wires connecting the two power supply electrodes C are connected to the positive and negative terminals of the power supply from the host. One end of the remaining fourteen core wires is connected to the drag-type electrode, and the other end is connected to the signal conditioning module inside the host. The signal conditioning module then inputs the signal to the multi-channel acquisition card for data acquisition and processing, performing simultaneous multi-channel acquisition of the potential at multiple points on the exploration surface. The number of exploration electrodes P can be adjusted according to the actual exploration area size and spacing. The specific principle of the multi-channel DC resistivity circuit belongs to mature electrical exploration acquisition technology, and will not be elaborated here in this embodiment.

[0037] Meanwhile, this embodiment also uses a multi-channel large cable 5 as a tow rope to connect all the drag electrodes 4 in series, in conjunction with [see also...]. Figure 4a and 4b The drag-type electrode 4 is provided with a cable through hole 403 for the multi-channel cable 5 to pass through. The inner wall of the cable through hole 403 is provided with an electrode spring 402 that is electrically connected to the internal circuit of the multi-channel cable 5. The multi-channel cable 5 is fixedly passed through the cable through hole 403 of the drag-type electrode 4 and is electrically connected to the drag-type electrode through the electrode spring 402. The electrode spring 402 is made of brass spring with high conductivity.

[0038] Multiple rigid sections can be inserted into the cable through-hole 403 of the drag-type electrode 4 on the multi-channel cable 5. The cables and sockets for connecting each drag-type electrode 4 are pre-arranged inside the multi-channel cable 5. After the rigid section on the multi-channel cable 5 is inserted into the cable through-hole 403 of the drag-type electrode, the drag-type electrode is positioned by the axial positioning component on the rigid section. The positioning shoulder or the mounting ring can be machined on the rigid section to axially position it with the cable through-hole 403. The electrode spring 402 in the cable through-hole 403 is aligned and connected by the reserved electrical socket on the multi-channel cable, thus realizing the electrical and physical connection between the multi-channel cable 5 and the drag-type electrode 4. The multi-channel cable 5 is a multi-core cable with a socket distributed according to the distribution spacing of the dragged electrodes, which can be connected to the electrode spring 402 on the dragged electrodes. In this embodiment, the dragged electrodes 4 are connected in series on the multi-channel cable 5, which means that all dragged electrodes are physically connected through the multi-channel cable. It does not mean that all dragged electrodes are connected in series through the multi-channel cable. The wiring arrangement of the multi-channel DC resistivity acquisition circuit between the dragged electrodes and the multi-channel DC resistivity acquisition host in the multi-channel cable 5 is a mature electrical exploration technology. This embodiment will not elaborate on the wiring arrangement of the acquisition circuit in the multi-channel cable 5.

[0039] In this embodiment, the drag-type electrode 4 adopts a split assembly structure. The drag-type electrode 4 is divided into two splicing electrode bodies 41 that are split in half along the axial direction of the large cable through hole. Electrode screw holes 401 that can be detached and fixed by screws are machined on the electrode bodies 41 located on both sides of the large cable through hole. The drag-type electrode 4 is spliced ​​into an integral electrode by two symmetrical splicing electrode bodies 41.

[0040] When the drag-on electrode 4 is installed onto the multi-channel cable, the separate splicing electrode bodies 41 are aligned and fastened to the mounting positions on the multi-channel cable 5 from both sides. Then, they are fixed together as a whole drag-on electrode 4 using screws or detachable connectors such as cable ties. This completes the installation and fixation of the drag-on electrode on the multi-channel cable 5. Simultaneously, the two halves of the splicing electrode body 41 clamp the drag-on electrode 4 onto the multi-channel cable. The separate splicing electrode bodies 41 also facilitate precise and reliable electrical connection between the electrode springs inside the cable through-hole 403 and the interface on the multi-channel cable 5. Since the drag-on electrode 4 rarely rotates during dragging, the lower electrode body will experience greater wear due to prolonged friction with the ground. The detachable structure of the splicing electrode body 41 also facilitates the replacement of the more worn half of the electrode body, reducing the cost of replacing the entire electrode body.

[0041] See you again Figure 4aIn this embodiment, the draggable electrode 4 adopts an ellipsoidal or spindle-shaped electrode that is smaller at both ends and larger in the middle. The electrode body is made of a good conductor material, such as copper, and the electrode surface is coated with a wear-resistant conductive coating. The ellipsoidal or spindle-shaped electrode ensures that the protruding part of the electrode body remains in contact with the ground during the process of being dragged by a multi-channel cable. The wear-resistant conductive coating on the electrode surface further reduces the wear of the draggable electrode when it is being dragged during exploration, improves the electrode's service life, and enables it to adapt to flat and hard ground environments.

[0042] This embodiment also includes an active water supply device 2 to improve the conductivity between the dragged electrode 4 and the exploration surface. Specifically, as follows... Figure 2 and Figure 3 As shown, the active water supply device 2 includes a water tank 21 and a water distribution seat 22. The water tank 21 is set on the mobile platform 3. The water tank 21 is filled with a brine solution with good conductivity. A multi-hole water outlet valve 211 is provided at the bottom of the water tank. The water distribution seat 22 is connected to the multi-hole water outlet valve 211. Multiple water inlets 221 on the water distribution seat 22 are connected to multiple outlets of the multi-hole water outlet valve 211. The water distribution seat 22 is provided with a water curtain outlet 222 that discharges water to the ground. The width of the water curtain formed by the water curtain outlet 222 exceeds the lateral distribution range of all the drag-type electrodes.

[0043] In this embodiment, all active water supply devices 2 are mounted on the mobile platform 3. During the movement of the mobile platform 3, the multi-hole water outlet valve 211 is opened, and the water in the water tank 21, under the action of gravity, forms a water curtain sprayed onto the ground through the water curtain outlet 222 of the water distribution seat 22. Since the mobile platform 3 drives the trailing electrode to be dragged across the exploration ground, the active water supply device 2 wets the exploration ground in advance, so that the ground environment is moist when the trailing electrode 4 is dragged across, which is beneficial to improving the conductivity between the trailing electrode 4 and the exploration ground. This embodiment uses a water curtain to distribute water to the exploration ground, and the width of the water distribution can cover the ground range of all the trailing electrodes, ensuring that all electrodes can be humidified.

[0044] Example 2

[0045] See Figure 7 The figure shows another specific implementation of the towed onshore multi-channel DC resistivity exploration system of the present invention, which specifically includes a multi-channel DC resistivity acquisition host 1, an active water supply device 2, a mobile platform 3, a towed electrode 4, a multi-channel cable 5, and a tail trailer 6. The exploration main structure of the multi-channel DC resistivity acquisition host 1, the mobile platform 3, the towed electrode 4, and the multi-channel cable 5 in this embodiment is the same as that in Embodiment 1. Unlike Embodiment 1, which involves pre-spraying water to humidify the exploration ground, this embodiment adopts an active water supply method that precisely sprays water onto each electrode.

[0046] Specifically, such as Figure 8and Figure 9 As shown, the active water supply device 2 in this embodiment includes a water tank 21, electrode spraying units 23, and connecting water pipes 24. The water tank 21 is set on the moving platform 3 and is filled with a salt solution with good conductivity. All electrode spraying units 23 are dragged and connected to the moving platform 3 at the same fixed arrangement spacing as the dragged electrodes, and correspond one-to-one with the position of the dragged electrodes. All electrode spraying units 23 are nozzles 231 set on rollers 232. The nozzles 231 are connected to the water tank 21 for water supply through the connecting water pipes 24. The nozzles 231 move synchronously with the dragged electrodes 4 through the rollers 232 and spray water towards the corresponding dragged electrodes for humidification.

[0047] The electrode water spraying unit 23 in this embodiment specifically includes a nozzle 231, a roller 232, and a water spraying connector 233. The nozzle 231, roller 232, and connecting water pipe 24 are all connected and installed through the water spraying connector 233. In this embodiment, the water spraying connector 233 is a three-way structure, in which two straight-through interfaces are respectively connected to the upper-level connecting water pipe and the lower-level connecting water pipe. The nozzle 231 is set on another bypass interface, and the roller 232 is rotatably installed on the connector pipe inside the bypass interface through a bearing. The roller 232 drives the water spraying connector 233 to move forward, and the nozzle 231 sprays water to the drag-type electrode that moves to the side.

[0048] The electrode water spray unit 23 and the corresponding dragged electrode 4 are synchronously dragged by the moving platform 3 to humidify the electrode surface and the exploration ground to increase conductivity. The electrode water spray unit 23 can be connected by a separate tow rope or directly by using the connecting water pipe 24 that supplies water to the electrode water spray unit 23 as the tow rope. The water spray connector 233 of each electrode water spray unit 23 is stably connected to the connecting water pipes 24 at each level through threaded joints on both sides. The multi-level connecting water pipes 24 form a flexible connection between adjacent electrode water spray units 23, which can adapt to the change of direction during the dragging process of the electrode water spray unit 23.

[0049] Water tank 24, which is directly connected to water tank 21, is connected to water tank 21 to supply water to all the electrode spraying units 23. The water supply can be passively supplied by the water pressure in the water tank, or actively supplied by a booster pump and connecting water pipe in the water tank. All nozzles spray fine salt water mist toward the corresponding dragged electrode after pressurization, so that the electrode surface is always wet and achieves good grounding and conductivity with the exploration ground.

[0050] Furthermore, in this embodiment, two electrode water spraying units 23 are symmetrically arranged on both sides of each drag-type electrode. All electrode water spraying units 23 on the same side of the drag-type electrode are connected to the same connecting water pipe 24. The electrode water spraying units 23 connected in series on both sides and the drag-type electrode 4 connected in series in the middle are all connected to the tail trailer 6 at the end away from the moving platform.

[0051] Electrode water spray units 23 are symmetrically arranged on both sides of the towed electrode, simultaneously spraying water to humidify the electrode from both sides. This avoids clogging of one side's nozzles, preventing the electrode from being unable to be humidified. Simultaneously, the roller-driven electrode water spray units on both sides ensure the stability of the towed electrode during towing, preventing it from shifting to one side due to the traction of a single-sided electrode water spray unit. One end of both the series-connected electrode water spray units 23 and the towed electrode 4 is connected to the moving platform 3 and its water tank, while the other end is connected via the tail trailer 6. This connects the two towing systems of the electrode water spray units 23 and the towed electrode 4 into a single unit, creating good overall stability between the towed electrode water spray units 23 and the towed electrode 4, thus ensuring reliable water humidification of the towed electrode 4 by the electrode water spray units 23.

[0052] In this document, the terms "upper," "lower," "front," "back," "left," "right," "top," "bottom," "inner," "outer," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used for the clarity of expressing the technical solution and for the convenience of description, and therefore should not be construed as limiting the present invention.

[0053] In this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0054] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A towable onshore multi-channel DC resistivity exploration system, characterized in that: Includes a mobile platform (3) and several drag-and-drop electrodes (4) connected to the mobile platform (3); The draggable electrode (4) includes two power supply electrodes and at least one set of exploration electrodes arranged in a dipole-dipole configuration with the power supply electrodes. All draggable electrodes (4) are dragged and connected to the mobile platform (3) at a fixed spacing. The mobile platform (3) drives all draggable electrodes (4) to move and drag as a whole on the exploration ground. All draggable electrodes (4) are electrically connected to the multi-channel DC resistivity acquisition host (1) set on the mobile platform (3) through a multi-channel cable (5). It also includes an active water supply device (2) to improve the conductivity between the dragged electrode (4) and the exploration surface. The active water supply device (2) includes a water tank (21) and several electrode spraying units (23). The water tank (21) is set on the moving platform (3). The water tank (21) contains a conductive brine solution. All the electrode spraying units (23) are dragged and connected to the moving platform (3) with the same fixed arrangement spacing as the dragged electrode, and correspond one-to-one with the dragged electrode. All the electrode spraying units (23) are nozzles (231) set on rollers (232). The nozzles (231) are connected by... The water pipe (24) is connected to the water tank (21) for water supply. The nozzle (231), roller (232) and water pipe (24) are all connected and installed through the water spray connector (233). The water spray connector (233) is a three-way structure, in which two straight interfaces are connected to the upper-level water pipe and the lower-level water pipe respectively. The nozzle (231) is set on another bypass interface. The roller (232) is installed on the connector pipe inside the bypass interface through the bearing. The roller (232) drives the water spray connector (233) to move forward. The nozzle (231) sprays water to the drag-type electrode that moves to the side.

2. The towed onshore multi-channel DC resistivity exploration system according to claim 1, characterized in that: All the drag-type electrodes (4) are connected in series on the multi-channel cable (5). The multi-channel cable (5) has integrated wiring that connects to each electrode. All the drag-type electrodes (4) are dragged and connected to the mobile platform (3) through the multi-channel cable (5).

3. The towed onshore multi-channel DC resistivity exploration system according to claim 2, characterized in that: The drag-type electrode (4) is provided with a cable through hole (403) for the multi-channel cable (5) to pass through. The inner wall of the cable through hole (403) is provided with an electrode spring (402) that is electrically connected to the internal circuit of the multi-channel cable (5). The multi-channel cable (5) is fixedly passed through the cable through hole (403) of the drag-type electrode (4) and electrically connected to the drag-type electrode through the electrode spring (402).

4. The towed onshore multi-channel DC resistivity exploration system according to claim 3, characterized in that: The drag-type electrode (4) can be detachably spliced ​​by splicing electrode bodies (41) symmetrical along the axial direction of the large cable through hole.

5. The towed onshore multi-channel DC resistivity exploration system according to claim 4, characterized in that: The drag-type electrode (4) adopts an ellipsoidal or spindle-shaped electrode with small ends and a large middle, and the electrode surface is provided with a wear-resistant conductive coating.

6. The towed onshore multi-channel DC resistivity exploration system according to claim 1, characterized in that: The multi-channel DC resistivity acquisition host (1) is equipped with a differential GPS positioning module (101).

7. The towed onshore multi-channel DC resistivity exploration system according to claim 1, characterized in that: Each of the drag-type electrodes is symmetrically provided with two electrode water spray units (23) on both sides. All the electrode water spray units (23) on the same side of the drag-type electrodes are connected in series on the same connecting water pipe (24). The electrode water spray units connected in series on both sides and the drag-type electrodes connected in series in the middle are all connected to the tail trailer (6) at the end away from the moving platform.

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