Dragging type multichannel DC resistivity acquisition system

Abstract

The utility model discloses a dragging-type multichannel direct current resistivity acquisition system. The dragging-type multichannel direct current resistivity acquisition system comprises a mobile platform and a plurality of dragging-type electrodes connected with the mobile platform, the dragging type electrodes comprise two power supply electrodes and at least one group of exploration electrodes, the exploration electrodes and the power supply electrodes are arranged in a dipole-dipole device, all the dragging type electrodes are in dragging connection with the mobile platform according to a fixed arrangement interval, and all the dragging type electrodes are driven by the mobile platform to integrally move and drag on the exploration ground; all the dragging type electrodes are electrically connected with a multi-channel direct-current resistivity acquisition host arranged on the mobile platform through a multi-channel large cable; and the active water supply device is used for improving the electric conductivity between the dragging type electrode and the exploration ground. According to the utility model, the design of the active water supply device and the dragging type electrode is adopted, so that non-driven type electrode power supply and potential measurement on flat grounds such as land dams and roads are realized, and the problem of low data acquisition efficiency of a traditional high-density resistivity method is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model discloses a kind of towed multi-channel direct current resistivity acquisition systems, belong to electrical prospecting field, especially the parallel acquisition of direct current resistivity data under the ground of dam, highway etc. BACKGROUND

[0002] The existing high-density direct current resistivity technology needs to realize power supply to underground and potential measurement by driving grounding electrode or capacitive coupling mode into underground when carrying out electrical prospecting.The method of driving grounding electrode is destructive to working environment, not applicable to the environment of dam, highway etc. SUMMARY

[0003] The utility model solves technical problem: for the low efficiency problem of using fixed driving electrode into underground for electrical prospecting, provide a kind of towed multi-channel direct current resistivity acquisition system.

[0004] The utility model adopts following technical scheme implementation:

[0005] A kind of towed multi-channel direct current resistivity acquisition system, including mobile platform 3 and the several towed electrodes 4 of being connected with mobile platform 3;The towed electrode 4 includes two power supply electrodes and at least one group of exploration electrode arranged as dipole-dipole device with power supply electrode, all towed electrodes 4 are dragged connection according to fixed arrangement spacing with mobile platform 3, all towed electrodes 4 are integrally moved by mobile platform 3 and dragged on exploration ground;All towed electrodes 4 are electrically connected with the multi-channel direct current resistivity acquisition host 1 of being set up on mobile platform 3 by multi-channel large cable;It further includes the active water supply device 2 of improving the conductivity between towed electrode 4 and exploration ground.

[0006] In the towed multi-channel direct current resistivity acquisition system of the utility model, further, all towed electrodes 4 are connected on multi-channel large cable 5, the internal integrated setting of multi-channel large cable 5 is connected with the line of each electrode, all towed electrodes 4 are dragged connection by multi-channel large cable 5 with mobile platform 3.

[0007] Further, the towed electrode 4 is detachably spliced through the splicing electrode body 41 symmetrical along the big cable through hole axis, and the maintainability of the electrode is improved.

[0008] Further, the towed electrode 4 is detachably spliced through the splicing electrode body 41 symmetrical along the big cable through hole axis, and the maintainability of the electrode is improved.

[0009] Further, the towed electrode 4 is detachably spliced through the splicing electrode body 41 symmetrical along the big cable through hole axis, and the maintainability of the electrode is improved.

[0010] Further, the towed electrode 4 is detachably spliced through the splicing electrode body 41 symmetrical along the big cable through hole axis, and the maintainability of the electrode is improved.

[0011] As a preferred scheme of the towed multi-channel direct current resistivity acquisition system, the active water supply device 2 comprises a water tank 21 and a water distribution seat 22, the water tank 21 is arranged on the mobile platform 3, a multi-hole water outlet valve 211 is arranged at the bottom of the water tank, the water distribution seat 22 is connected with the multi-hole water outlet valve 211, a plurality of water inlets on the water distribution seat are in one-to-one correspondence with a plurality of outlets of the multi-hole water outlet valve 211, a water curtain water outlet 222 for discharging water to the ground is arranged on the water distribution seat 22, and the water curtain water outlet 222 forms a water curtain with a width exceeding the transverse distribution range of all the towed electrodes.

[0012] As another preferred scheme of the towed multi-channel direct current resistivity acquisition system, the active water supply device 2 comprises a water tank 21 and a plurality of electrode water spraying units 23, the water tank 21 is arranged on the mobile platform 3, all the electrode water spraying units 23 are connected with the mobile platform 3 in the same fixed arrangement interval as the towed electrodes, and are in one-to-one correspondence with the towed electrodes, all the electrode water spraying units 23 are spray heads 231 arranged on rollers 232, the spray heads 231 are connected with the water tank 21 through connecting water pipes 24, and spray water towards the corresponding towed electrodes.

[0013] In the above-mentioned dragging type multi-channel direct current resistivity acquisition system, further, two electrode water spraying units 23 are symmetrically arranged on both sides of each dragging electrode, and the electrode water spraying units on the same side of all the dragging electrodes are connected to the same connecting water pipe 24, and the electrode water spraying units on both sides are connected in series with the dragging electrode connected in series in the middle, and the tail of the tail part 6 is connected to the tail of the tail part 6.

[0014] In the dragging type multi-channel direct current resistivity acquisition system, further, the water tank 21 contains an electrically conductive saline solution.

[0015] The above-mentioned technical scheme has the following beneficial effects:

[0016] (1) The utility model provides a new dragging type land multi-channel direct current resistance exploration system for the electrical prospecting of land embankment, highway and other flat ground, uses the mobile platform to drag the whole movement of all electrodes on the exploration ground, and cooperates with the small two ends and the large middle dragging electrode, after completing the exploration of a ground area, all the dragging electrodes are dragged to the next exploration area by the mobile platform, which can realize continuous, rapid and accurate exploration of the exploration ground. The dragging electrode realizes the connection of the dragging system and the electrical connection of the multi-channel direct current resistivity acquisition host with the mobile platform at the same time, saves the line arrangement of the dragging system, realizes the exploration of the exploration ground by controlling the mobile platform, and the exploration operation is simpler and the exploration efficiency is higher.

[0017] (2) The utility model is aimed at the contact of the dragging electrode and the exploration ground to collect the electric signal, and does not need to drill the electrode into the ground, which will not cause damage to the completed flat ground, and ensures the integrity of the exploration ground. At the same time, the active water supply device is arranged to improve the conductivity of the grounding of the dragging electrode, enhance the accuracy of the ground electric signal acquisition in the electrode contact exploration process, and realize the land high-density direct current resistivity dragging type continuous acquisition.

[0018] (3) The utility model uses the multi-channel direct current resistivity acquisition host with integrated differential GPS positioning module to realize the dragging type data acquisition of high-density direct current resistivity, and accurately records the position of the acquisition point during the dragging data acquisition by real-time positioning of the mobile platform.

[0019] In summary, the dragging type multi-channel direct current resistivity acquisition system provided by the utility model adopts the active water supply device and the dragging electrode design, realizes the non-drilling electrode power supply and potential measurement of the land embankment, highway and other flat ground, realizes the dragging type data acquisition of high-density direct current resistivity of the exploration ground by combining differential GPS positioning and multi-channel data acquisition, effectively improves the problem of low data acquisition efficiency of traditional high-density resistivity method, and provides technical support for embankment flood prevention, inspection and the like.

[0020] The utility model is further described below in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is whole schematic view of drag type multi-channel direct current resistivity acquisition system of example one.

[0022] Figure 2 It is water tank schematic view of active water supply device in example one.

[0023] Figure 3 It is water distribution seat schematic view of active water supply device in example one.

[0024] Figure 4a 、 4b It is schematic view of drag type electrode in example one respectively.

[0025] Figure 5 It is multi-channel direct current resistivity acquisition host schematic view in example one.

[0026] Figure 6 It is multi-channel direct current resistivity acquisition circuit schematic view of example one.

[0027] Figure 7 It is whole schematic view of drag type multi-channel direct current resistivity acquisition system of example two.

[0028] Figure 8 It is electrode water spraying unit schematic view of active water supply device in example two.

[0029] Figure 9 It is spray head and roller schematic view of electrode water spraying unit in example two.

[0030] Marked number in drawing: 1-multi-channel direct current 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 water outlet, 23-electrode water spraying unit, 231-spray head, 232-roller, 233-water spraying connecting head, 24-connecting water pipe, 3-moving platform, 4-drag type electrode, 41-spliced electrode body, 401-electrode screw hole, 402-electrode spring piece, 403-large cable through hole, 5-multi-channel large cable, 6-tail tow frame. DETAILED DESCRIPTION

[0031] Example one

[0032] Referring to Figure 1 , the drawing is one specific implementation scheme of the utility model drag type multi-channel direct current resistivity acquisition system, and specifically includes multi-channel direct current resistivity acquisition host 1, active water supply device 2, moving platform 3, drag type electrode 4, multi-channel large cable 5.

[0033] The embodiment takes the mobile platform 3 and the sixteen groups of towed electrodes connected with the mobile platform 3 as the main body of the exploration system. The mobile platform 3 is a mobile carrier carrying the multi-channel direct current resistivity acquisition host 1, the active water supply device 2 and the towed electrodes 4. The mobile platform 3 can be realized by using a handcart or an electrically driven trolley. The towed electrodes 4 in the embodiment include two power supply electrodes C and fourteen exploration electrodes P. The several exploration electrodes P and the power supply electrodes C form a dipole-dipole device to perform simultaneous multi-channel acquisition. All the towed electrodes 4 are connected with the mobile platform 3 in a fixed arrangement interval. In the embodiment, all the towed electrodes 4 are equally spaced and connected in series behind the mobile platform 3. The mobile platform 3 drives all the towed electrodes 4 to move integrally on the exploration ground. All the towed electrodes 4 are electrically connected with the multi-channel direct current resistivity acquisition host 1 arranged on the mobile platform 3 through the multi-channel large cable 5. The multi-channel direct current resistivity acquisition host 1 is internally provided with a multi-channel direct current resistivity acquisition circuit. The towed electrodes perform multi-channel acquisition and processing on the electrical signals of the exploration ground. After the exploration of a ground area is completed, the mobile platform directly moves all the towed electrodes integrally to the next area to realize continuous exploration.

[0034] Further, all the towed electrodes 4 are connected in series on the multi-channel large cable 5. The multi-channel large cable 5 is a multi-core cable, which is internally provided with lines electrically connected with the electrodes. At the same time, all the towed electrodes 4 are connected with the mobile platform 3 through the multi-channel large cable 5. The multi-channel large cable 5 connected with the multi-channel direct current resistivity acquisition host 1 is first clamped and fixed by the wire pipe clamp on the mobile platform 3, and then extended to be connected in series with the towed electrodes 4. In this way, the multi-channel large cable 5 is avoided from being directly connected with the mobile platform 3 through the multi-channel direct current resistivity acquisition host 1. In the embodiment, all the towed electrodes 4 are equally spaced and connected in series on the multi-channel large cable 5. The multi-channel large cable 5 serves as not only the cable electrically connecting the towed electrodes 4 and the multi-channel direct current resistivity acquisition host 1, but also the tow rope connecting the towed electrodes 4 and the mobile platform 3. This avoids the problem of line redundancy in the exploration process caused by too many cables.

[0035] For reference Figure 5The multi-channel direct current resistivity acquisition host 1 in the embodiment is internally provided with a differential GPS positioning module 101 and a multi-channel high-speed acquisition card to realize system positioning and data acquisition. The differential GPS positioning module 101 can accurately record the position of the acquisition point when the data is acquired by dragging. The acquisition program is controlled by an industrial computer. The multi-channel direct current resistivity acquisition host 1 supplies power to the underground through the external DC high-voltage battery box via the dragging electrode 4, and measures the current through the high-stability sampling resistor inside. The multi-channel direct current resistivity acquisition host 1 is fixedly installed on the mobile platform 3 and moves with the mobile platform 3. The multi-channel direct current resistivity acquisition host has a multi-channel acquisition card integrating a multi-channel direct current resistivity acquisition circuit. The multi-channel acquisition card is electrically connected with the dragging electrode 4 through the multi-core line in the multi-channel large cable 5. The acquisition is controlled through real-time communication with the differential GPS positioning module 101. The Sic full-bridge circuit is controlled to supply power to the ground. In the embodiment, the multi-channel direct current resistivity acquisition host 1 uses Nordica TPC6000-B101-C1 as an industrial computer, the multi-channel acquisition card uses ART USB5633-D, and the differential GPS positioning module 101 uses Alpha 6 high-precision surveying and mapping GPS.

[0036] The multi-channel direct current resistivity acquisition host 1 is electrically connected with the multi-channel large cable 5, as shown in Figure 6 Two power supply electrodes C connected in series on the multi-channel large cable 5 are connected in a loop with a low-frequency high-voltage power supply on the multi-channel direct current resistivity acquisition host to supply power to the exploration ground. The remaining fourteen exploration electrodes P are connected with the power supply electrodes C through a dipole-dipole connection. The multi-channel large cable 5 has sixteen core conductors. Two core conductors connecting the two power supply electrodes C are connected with the positive and negative electrodes of the power supply on the host. The remaining fourteen core conductors are connected with the dragging electrodes at one end and connected with the signal conditioning module in the host at the other end. Then the signal is input to the multi-channel acquisition card through the signal conditioning module for data acquisition and processing, and the multi-channel acquisition of the multi-point potential of the exploration ground is performed at the same time. The number of exploration electrodes P can be adjusted according to the actual exploration area size and the setting interval. The specific multi-channel direct current resistivity circuit principle belongs to mature electrical exploration acquisition technology, which is not described in detail in the embodiment.

[0037] Meanwhile, the multi-channel large cable 5 is also used as a tow rope for connecting all the dragging electrodes 4 in series. Referring to Figure 4a and 4b , the multi-channel large cable 5 passes through the large cable through hole 403 provided on the dragging electrode 4. The inner wall of the large cable through hole 403 is provided with an electrode spring 402 electrically connected with the internal line of the multi-channel large cable 5. The multi-channel large cable 5 is fixedly passed through the large cable through hole 403 of the dragging electrode 4 and electrically connected with the dragging electrode through the electrode spring 402. The electrode spring 402 is made of brass with high electrical conductivity.

[0038] The multi-channel large cable 5 can be inserted into the large cable through hole 403 of the drag electrode 4, and the cables and sockets connected to the drag electrode 4 are arranged in the multi-channel large cable 5 in advance. After the rigid body on the multi-channel large cable 5 is inserted into the large cable through hole 403 of the drag electrode, the drag electrode is realized through the axial positioning component on the rigid body. The positioning shaft shoulder or mounting ring on the rigid body can be axially positioned with the large cable through hole 403. The electrical connection and physical connection between the multi-channel large cable 5 and the drag electrode 4 are realized through the electrical socket reserved on the multi-channel large cable and the electrode spring 402 in the large cable through hole 403. The multi-channel large cable 5 is a multi-core cable, and a socket that can be connected to the electrode spring 402 on the drag electrode is arranged on the multi-channel large cable according to the distribution interval of the drag electrode. In the embodiment, the drag electrode 4 is connected in series on the multi-channel large cable 5, which means that the physical connection between all drag electrodes is realized through the multi-channel large cable, and does not mean that all drag electrodes are connected in series through the multi-channel large cable. The line arrangement of the multi-channel direct current resistivity acquisition circuit between the drag electrode and the multi-channel direct current resistivity acquisition host in the multi-channel large cable 5 is a mature electrical prospecting technology, and the line arrangement of the acquisition circuit in the multi-channel large cable 5 is not described in detail in this embodiment.

[0039] The drag electrode 4 in the embodiment adopts a split assembly structure, and the drag electrode 4 is divided into two symmetrical half electrode bodies 41. The electrode screw holes 401 that can be detachably fixed by screws are arranged on the electrode bodies on both sides of the large cable through hole. The drag electrode 4 is assembled into a whole electrode by the two symmetrical half electrode bodies 41.

[0040] When the drag electrode 4 is installed on the multi-channel large cable, the split half electrode bodies 41 are buckled on the installation position of the multi-channel large cable 5 from both sides, and then are fixed and connected into a whole drag electrode 4 by screws or detachable connectors such as binding rings, to complete the installation and fixation of the drag electrode on the multi-channel large cable 5. The two half electrode bodies 41 clamp the drag electrode 4 on the multi-channel large cable. The split half electrode bodies 41 also facilitate the accurate and reliable electrical connection between the electrode spring in the large cable through hole 403 and the interface on the multi-channel large cable 5. Since the drag electrode 4 rarely rotates during dragging, the lower electrode body is more likely to be worn than the upper electrode body due to long-time friction with the ground. The detachable half electrode bodies 41 can facilitate the replacement of the more worn half electrode body, thereby reducing the cost of replacing the whole electrode body.

[0041] Referring again to Figure 4aThe dragging electrode 4 of the embodiment adopts an ellipsoid or a spindle electrode with small ends and a large middle part, the electrode body adopts a good conductor material, such as a copper electrode, and the electrode surface is provided with a wear-resistant conductive coating. The ellipsoid or spindle electrode can ensure that the electrode body protruding part is always in contact with the ground during the dragging process by the multi-channel large cable, and the wear-resistant conductive coating arranged on the electrode body surface further reduces the wear of the dragging electrode during the dragging on the exploration ground, improves the service life of the electrode, and can adapt to the flat and hard ground environment.

[0042] The embodiment also includes an active water supply device 2 for improving the conductivity between the dragging electrode 4 and the exploration ground. Figure 2 and Figure 3 As shown in the drawings, the active water supply device 2 includes a water tank 21 and a water distribution seat 22, the water tank 21 is arranged on the moving platform 3, the water tank 21 is filled with a salt water solution with good conductivity, the bottom of the water tank is provided with a porous water outlet valve 211, the water distribution seat 22 is connected with the porous water outlet valve 211, a plurality of water inlets 221 on the water distribution seat 22 are in one-to-one correspondence with a plurality of outlets of the porous water outlet valve 211, and a water curtain water outlet 222 for spraying water to the ground is arranged on the water distribution seat 22, and the water curtain formed by the water curtain water outlet 222 has a width exceeding the transverse distribution range of all the dragging electrodes.

[0043] The active water supply device 2 in the embodiment is all arranged on the moving platform 3, during the movement of the moving platform 3, the porous water outlet valve 211 is opened, and the water in the water tank 21 is sprayed to the ground in the form of a water curtain through the water curtain water outlet 222 of the water distribution seat 22 under the action of gravity, since the moving platform 3 drags the dragging electrodes connected behind on the exploration ground, the exploration ground is first wetted by the active water supply device 2, so that the ground environment is moist when the dragging electrodes 4 behind are dragged, which is beneficial to improve the conductivity between the dragging electrodes 4 and the exploration ground. The water distribution mode of the water curtain adopted in the embodiment can cover the ground range where all the dragging electrodes move, so that the wetting effect can be achieved on all the electrodes.

[0044] Embodiment two

[0045] Referring to Figure 7 , another specific implementation scheme of the dragging multi-channel direct current resistivity acquisition system is shown, which specifically includes a multi-channel direct current resistivity acquisition host 1, an active water supply device 2, a moving platform 3, a dragging electrode 4, a multi-channel large cable 5 and a tail drag frame 6, the main exploration structure of the multi-channel direct current resistivity acquisition host 1, the moving platform 3, the dragging electrode 4 and the multi-channel large cable 5 in the embodiment is the same as that in the first embodiment, and the difference from the first embodiment is that the active water supply device 2 is used to spray water on each electrode.

[0046] Specifically as shown in the drawings, the active water supply device 2 includes a water tank 21 and a water distribution seat 22, the water tank 21 is arranged on the moving platform 3, the water tank 21 is filled with a salt water solution with good conductivity, the bottom of the water tank is provided with a porous water outlet valve 211, the water distribution seat 22 is connected with the porous water outlet valve 211, a plurality of water inlets 221 on the water distribution seat 22 are in one-to-one correspondence with a plurality of outlets of the porous water outlet valve 211, and a water curtain water outlet 222 for spraying water to the ground is arranged on the water distribution seat 22, and the water curtain formed by the water curtain water outlet 222 has a width exceeding the transverse distribution range of all the dragging electrodes. Figure 8and Figure 9 As shown in the figure, the active water supply device 2 in the embodiment includes a water tank 21, an electrode water spraying unit 23 and a connecting water pipe 24, the water tank 21 is arranged on the moving platform 3, the water tank 21 is filled with a saltwater solution with good conductivity, all the electrode water spraying units 23 are connected with the moving platform 3 in the same fixed arrangement interval as the towed electrode and correspond to the positions of the towed electrodes one by one, all the electrode water spraying units 23 are spray heads 231 arranged on rollers 232, the spray heads 231 are connected with the water tank 21 for water supply through the connecting water pipe 24, the spray heads 231 move synchronously with the towed electrodes 4 through the rollers 232 and spray water to the corresponding towed electrodes for humidification.

[0047] The electrode water spraying unit 23 in the embodiment specifically includes a spray head 231, a roller 232 and a water spraying connector 233, the spray head 231, the roller 232 and the connecting water pipe 24 are all connected and installed through the water spraying connector 233, the water spraying connector 233 in the embodiment is a tee structure, two straight-through interfaces of which are connected with the upper and lower connecting water pipes respectively, the spray head 231 is arranged on the other 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 spray head 231 sprays water to the corresponding moving towed electrode on the side.

[0048] The electrode water spraying unit 23 and the corresponding towed electrode 4 are synchronously towed by the moving platform 3 to realize humidification between the electrode surface and the exploration ground to increase the conductivity, the electrode water spraying unit 23 can be connected through a separate tow rope or directly through the connecting water pipe 24 connected with the electrode water spraying unit 23 for water supply, the water spraying connector 233 of each electrode water spraying unit 23 is stably connected with the connecting water pipe 24 of each level through a threaded joint, and the multi-level connecting water pipe 24 forms a flexible connection between adjacent electrode water spraying units 23, which can adapt to the directional movement in the towing process of the electrode water spraying unit 23.

[0049] The connecting water tank 24 directly connected with the water tank 21 realizes water supply connection between the water tank 21, supplies water to all connected electrode water spraying units 23, the power of water supply can be passive water supply through the water pressure in the water tank or active water supply through the pressure pump arranged in the water tank and the connecting water pipe, all the spray heads spray fine saltwater mist towards the corresponding towed electrodes, so that the electrode surface is always in a wet state and realizes good grounding and conductivity conditions with the exploration ground.

[0050] Further, two electrode water spraying units 23 are symmetrically arranged on both sides of each tow electrode, the electrode water spraying units 23 on the same side of all tow electrodes are connected to the same water pipe 24, and the electrode water spraying units 23 on both sides are connected to the tow frame 6 at the end far from the moving platform.

[0051] The electrode water spraying units 23 are symmetrically arranged on both sides of the tow electrode, and the electrode is sprayed and humidified from both sides at the same time, which can avoid the situation that the electrode cannot be sprayed and humidified due to the blockage of the nozzle on one side, and the electrode water spraying units driven by the rollers arranged on both sides can improve the stability of the tow electrode during the towing process, and avoid the deviation to one side caused by the traction of the electrode water spraying unit on one side. One end of the electrode water spraying unit 23 and the tow electrode 4 is connected to the moving platform 3 and the water tank thereon, and the other end is connected through the tail tow frame 6, so that the two sets of towing systems of the electrode water spraying unit 23 and the tow electrode 4 are connected into one whole, the electrode water spraying unit 23 and the tow electrode 4 in the towing movement form good integrity, and the electrode water spraying unit 23 reliably sprays and humidifies the tow electrode 4.

[0052] In this document, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to express the technical solution clearly and conveniently, and therefore cannot be understood as a limitation on the present application.

[0053] In this document, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, in addition to the listed elements, other elements not explicitly listed can also be included.

[0054] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A towed multi-channel direct current resistivity acquisition system, characterized by: The mobile platform (3) and a plurality of towed electrodes (4) connected with the mobile platform (3) are included. The towed electrodes (4) include two power supply electrodes and at least one set of exploration electrodes arranged in a dipole-dipole device with the power supply electrodes, all the towed electrodes (4) are connected with the mobile platform (3) in a fixed arrangement interval, and all the towed electrodes (4) are moved as a whole on the exploration ground by the mobile platform (3); all the towed electrodes (4) are electrically connected with a multi-channel DC resistivity acquisition host (1) arranged on the mobile platform (3) through a multi-channel large cable (5). The active water supply device (2) for improving the conductivity between the towed electrodes (4) and the exploration ground is further included.

2. The towed multi-channel DC resistivity acquisition system of claim 1, wherein: All the towed electrodes (4) are connected in series on the multi-channel large cable (5), the multi-channel large cable (5) is internally provided with lines electrically connected with each electrode, and all the towed electrodes (4) are connected with the mobile platform (3) through the multi-channel large cable (5).

3. The towed multi-channel DC resistivity acquisition system of claim 2, wherein: The towed electrode (4) is provided with a large cable through hole (403) for the multi-channel large cable (5) to pass through, the inner wall of the large cable through hole (403) is provided with an electrode spring (402) electrically connected with the internal lines of the multi-channel large cable (5), the multi-channel large cable (5) is fixedly passed through the large cable through hole (403) of the towed electrode (4) and electrically connected with the towed electrode through the electrode spring (402).

4. The towed multi-channel DC resistivity acquisition system of claim 3, wherein: The towed electrode (4) is detachably spliced through the splicing electrode body (41) symmetrical along the large cable through hole axis.

5. The towed multi-channel DC resistivity acquisition system of claim 4, wherein: The towed electrode (4) adopts an ellipsoid or a spindle electrode with small ends and a large middle part, and the electrode surface is provided with a wear-resistant conductive coating.

6. The towed multi-channel DC resistivity acquisition system of claim 1, wherein: The multi-channel DC resistivity acquisition host (1) is integrally provided with a differential GPS positioning module (101).

7. The towed multi-channel DC resistivity acquisition system of claim 1, wherein: The active water supply device (2) includes a water tank (21) and a water distribution seat (22), the water tank (21) is arranged on the mobile platform (3), the bottom of the water tank is provided with a multi-hole water outlet valve (211), the water distribution seat (22) is connected with the multi-hole water outlet valve (211), a plurality of water inlets on the water distribution seat are one-to-one connected with a plurality of outlets of the multi-hole water outlet valve (211), the water distribution seat (22) is provided with a water curtain water outlet (222) for water outlet to the ground, and the water curtain water outlet (222) forms a water curtain with a width exceeding the transverse distribution range of all the towed electrodes.

8. The towed multi-channel DC resistivity acquisition system of claim 1, wherein: The active water supply device (2) includes a water tank (21) and a plurality of electrode water spraying units (23), the water tank (21) is arranged on the mobile platform (3), all the electrode water spraying units (23) are connected with the mobile platform (3) in the same fixed arrangement interval as the towed electrodes and one-to-one correspond to the towed electrodes, and all the electrode water spraying units (23) are spray heads (231) arranged on rollers (232), the spray heads (231) are connected with the water tank (21) through a connecting water pipe (24) for water supply, and spray water towards the corresponding towed electrodes.

9. The towed multi-channel DC resistivity acquisition system of claim 8, wherein: Two electrode water spraying units (23) are symmetrically arranged on both sides of each said tow electrode, and all electrode water spraying units (23) on the same side of the tow electrode are connected in series on the same water pipe (24), and the electrode water spraying units connected in series on both sides and the tow electrode connected in series in the middle are all connected with the tail tow rack (6) at the end far from the moving platform.

10. The towed multi-channel DC resistivity acquisition system of claim 7 or 9, wherein: The water tank (21) contains an electrically conductive brine solution.

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