Ground-to-air transient electromagnetic detection device and method

Abstract

The present invention belongs to the technical field of electromagnetic field measurement equipment, and specifically to a ground-to-air transient electromagnetic detection device and method, comprising a ground transmitting electrode, an aerial receiving electrode and aviation equipment; the present invention improves the aerial receiving electrode, and in the process of semi-aeronautical transient electromagnetic detection, adopts a supporting frame formed by a structure such as an inflatable column, and cooperates with side wings to support the supporting frame, thereby reducing the total weight of the aerial receiving electrode and reducing the burden on the aviation equipment; at the same time, due to the connection between the side wings and the supporting frame, a plurality of side wings support the supporting frame, thereby enhancing the supporting effect of the supporting frame, providing a stable frame structure for the coil composed of cables, and thereby maintaining the stability of the aerial receiving electrode.

Description

Technical Field

[0001] The invention belongs to the technical field of electromagnetic field measurement equipment, in particular to a ground-to-air transient electromagnetic detection device and method. Background Art

[0002] Semi-aerial transient electromagnetic detection technology is a technology that uses the principle of electromagnetic induction to detect underground structures. This technology releases electromagnetic pulses in the air to stimulate the underground medium to generate a transient electromagnetic field, and then detects the electromagnetic response of the underground medium through ground or air receiving devices to obtain underground structure information. Compared with traditional ground detection methods, semi-aerial transient electromagnetic detection technology has the advantages of large detection depth, high efficiency, and low cost. It is particularly suitable for underground resource exploration in large areas and complex terrains.

[0003] In semi-aerial transient electromagnetic detection technology, the coil is carried by aerial equipment such as drones and runs along a predetermined route in the air. Since the coil itself is composed of copper and aluminum wires and has a large number of turns, its mechanical properties are poor. Therefore, a frame structure is also required to maintain the shape of the coil in the air. This results in a large coil weight, which not only increases the pressure on the carrying capacity of aerial equipment, but also reduces the endurance of aerial equipment. As the detection depth increases, the transmitting loop area and number of turns of the coil expand proportionally, which leads to a further increase in the volume and weight of the coil. In view of the high cost of upgrading aviation equipment, it is particularly necessary to reduce the weight of the coil.

[0004] In order to reduce the weight of the coil in the related art, a pod-type time-domain airborne transient electromagnetic exploration system based on a lightweight inflatable tube support structure is disclosed, with application number CN2016105154594. The scheme introduces the anti-compression load-bearing effect of the inflation pressure, and replaces the material stiffness of the fiberglass tube with the air bearing stiffness of the inflatable tube to achieve lightweight of the large cable support ring of the airborne transient electromagnetic system, and is convenient to transport. The vibration generated during working state and take-off and landing has little effect on the receiving sensor, and can achieve multi-coil, high resolution and high precision within the limited load range of the helicopter. However, in actual application, it is found that, on the one hand, although the reduction of the weight of the support frame itself can effectively reduce the total weight of the coil, the presence of multiple turns of cables and wires causes the weight of the coil to be still large, which still imposes a heavy burden on the flight equipment.

[0005] In view of this, the present invention proposes a ground-to-air transient electromagnetic detection device and method to solve the above-mentioned technical problems. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art and solve the above-mentioned technical problems, the present invention proposes a ground-to-air transient electromagnetic detection device and method.

[0007] The technical solution adopted by the present invention to solve the technical problem is: the ground-to-air transient electromagnetic detection device of the present invention comprises a ground transmitting electrode, an aerial receiving electrode and aviation equipment;

[0008] The ground transmitting electrode is used to inject a transient current of a high voltage pulse into the ground;

[0009] The aerial receiving electrode is installed on the aviation equipment, and the aerial receiving electrode is used to capture and measure the induced eddy current field;

[0010] The aerial receiving electrode comprises a supporting frame, cables and a weight reduction mechanism;

[0011] The support frame is a circular structure composed of multiple sections of inflatable columns and connecting pieces connected alternately, and the inflatable columns are composed of a wear-resistant plastic layer and an airtight layer;

[0012] The cables are laid along the supporting frame, and the cables are bound and connected to the supporting frame by ropes;

[0013] A plurality of anti-torsion ropes are installed on the support frame, and the anti-torsion ropes are used to connect the support frame and the aviation equipment;

[0014] The weight reduction mechanism is used to reduce the weight of the aerial receiving electrode, and the weight reduction mechanism includes side wings and a connecting belt;

[0015] The side wing is a sheet-like structure, the side wing is made of elastic material, a filling cavity is opened in the side wing, the filling cavity is filled with filling gas, the filling gas density is less than the air density, and the buoyancy of the side wing is less than the total gravity of the receiving electrode in the air;

[0016] The connecting belt is fixedly mounted on the side wing, and one end of the connecting belt away from the side wing is sleeved on the supporting frame.

[0017] Furthermore, a plurality of the side wings form a complete annular structure, and two adjacent side wings are elastically connected by an elastic band.

[0018] Furthermore, it also includes a deformation resistance reduction mechanism, which is installed on the weight reduction mechanism, and the deformation resistance reduction mechanism reduces the wind resistance of the aerial receiving electrode by changing the shape of the side wings;

[0019] The deformation resistance reduction mechanism comprises a connecting pipe, a control rod, a support spring and a traction rope;

[0020] The connecting pieces are all equipped with connecting pipes, which are radially arranged outward from the center of the supporting frame;

[0021] The control rod is installed at the end of the connecting pipe, a support spring is fixedly installed in the inner cavity of the connecting pipe, and the control rod extends into the inner cavity of the connecting pipe and is fixedly connected to the support spring;

[0022] The side wings are all located below the connecting tube, and one end of the side wings away from the supporting frame is connected to the control rod;

[0023] The traction rope is fixedly mounted on the control rod, a steering ring is fixedly mounted on the connecting piece, and the traction rope passes around the steering ring and then extends to the aviation equipment.

[0024] Furthermore, the deformation resistance reduction mechanism also includes a strong spring, a rotating cylinder and a lifting block;

[0025] The rotating cylinder is a cylindrical structure with an opening at the top, a strong spring is fixedly installed in the rotating cylinder, and a lifting block is fixedly installed at the end of the strong spring;

[0026] The anti-torsion rope includes a suspension rope and a dispersion rope, wherein the suspension rope is used to fix the lifting block to the aviation equipment, and the dispersion rope is used to fix the central rotating drum to the supporting frame;

[0027] A through hole is opened in the middle of the rotating cylinder, and the traction rope extends into the rotating cylinder through the through hole, and the traction rope is fixedly connected to the lifting block;

[0028] When the aerial receiving electrode is suspended in the air, the lifting block is flush with the through hole.

[0029] Furthermore, a threaded groove is provided at the bottom of the rotating cylinder, an adjusting block is threadedly installed in the threaded groove, the strong spring is fixedly installed on the adjusting block, and the adjusting block is used to adjust the starting position of the strong spring.

[0030] Furthermore, a limiting ring is provided at the top of the rotating cylinder, and the inner diameter of the limiting ring is smaller than the outer diameter of the lifting block.

[0031] Furthermore, an arc-shaped hole is provided on the connecting tube, and a push rod is slidably installed in the arc-shaped hole. The push rod is made of elastic material, one end of the push rod extends outside the connecting tube, and the other end extends into the connecting tube. A top plate is fixedly installed at one end of the push rod outside the connecting tube, and one end of the push rod inside the connecting tube is fixedly connected to the control rod.

[0032] Furthermore, the connecting member is sequentially provided with a rotating groove, a limiting groove and a swinging groove, the connecting tube is rotatably connected to the connecting member via the rotating groove, the connecting tube is provided with a telescopic groove, a clamping strip is elastically connected to the telescopic groove via a spring, the clamping strip matches the limiting groove, a swing rod is rotatably installed at the top of the swinging groove, a strong magnet is fixedly installed at the bottom of the swing rod, the clamping strip is made of ferromagnetic material, and when the supporting frame is in a horizontal state, the strong magnet is aligned with the limiting groove, and the clamping strip enters the limiting groove.

[0033] Furthermore, a stabilizing spring is fixedly installed in the rotating groove, and the stabilizing spring extends to the connecting pipe. The stabilizing spring is used to control the alignment of the clamping strip and the telescopic groove.

[0034] A ground-to-air transient electromagnetic detection method, the method comprising the following steps:

[0035] S1: Set up the ground transmitting electrode on the ground surface and adjust its position to optimize the detection point;

[0036] S2: Connect the aerial equipment to the aerial receiving electrode, and lift the aerial receiving electrode into the air using the anti-torsion rope with the help of the traction force of the aerial equipment;

[0037] S3: The ground transmitting electrode injects a transient current of high voltage pulse into the ground, thereby exciting a pulse electromagnetic field;

[0038] S4: During the intervals of the pulsed magnetic field, the aerial receiving electrodes are responsible for monitoring the transient secondary electromagnetic field induced by the underground medium and deducing the detection results based on the acquired data.

[0039] The beneficial effects of the present invention are as follows:

[0040] 1. The ground-to-air transient electromagnetic detection device and method described in the present invention improves the aerial receiving electrode. In the semi-aerial transient electromagnetic detection process, a support frame is formed by using structures such as inflatable columns, and the side wings support the support frame, thereby reducing the total weight of the aerial receiving electrode and reducing the burden on the aviation equipment. At the same time, due to the connection between the side wings and the support frame, multiple side wings support the support frame, thereby enhancing the supporting effect of the support frame, providing a stable frame structure for the coil composed of cables, and maintaining the stability of the aerial receiving electrode.

[0041] 2. The ground-to-air transient electromagnetic detection device and method described in the present invention, by providing a deformation resistance reduction mechanism, changes the shape of the wing during the ascent or descent of the aerial receiving electrode and the aviation equipment, thereby adjusting the size of the windward surface of the wing, and further adjusting the wind resistance caused by the movement of the aerial receiving electrode. This can not only effectively reduce the influence of wind resistance on the movement of the aerial receiving electrode, but also use the deformed wing to protect and buffer the supporting skeleton and cables, thereby reducing the probability of equipment damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The present invention will be further described below in conjunction with the accompanying drawings.

[0043] Figure 1 is a stereogram of the present invention;

[0044] Figure 2 It is a three-dimensional diagram of the supporting skeleton;

[0045] Figure 3 It is a stereogram of the side wing;

[0046] Figure 4 It is the assembly drawing of the connecting tube, control rod and traction rope;

[0047] Figure 5 is a cross-sectional view of the connecting pipe;

[0048] Figure 6 It is a stereoscopic diagram of the assembly of the central rotating drum and the anti-torsion rope;

[0049] Figure 7 is a cross-sectional view of the rotating drum;

[0050] Figure 8 is a partial cross-sectional view of a connector;

[0051] Fig. 9 is a flow chart of the method of the present invention;

[0052] In the figure: 1. Aviation equipment; 2. Inflatable column; 21. Connector; 22. Cable; 23. Wing; 24. Connecting belt; 25. Elastic belt; 3. Connecting tube; 31. Control rod; 32. Support spring; 33. Towing rope; 34. Steering ring; 4. Powerful spring; 41. Lifting block; 42. Rotating cylinder; 43. Through hole; 5. Suspension rope; 51. Dispersion rope; 6. Threaded groove; 61. Adjusting block; 62. Limiting ring; 63. Arc hole; 64. Push rod; 65. Top plate; 7. Rotating groove; 71. Limiting groove; 72. Swinging groove; 73. Telescopic groove; 74. Card strip; 75. Swinging rod; 76. Powerful magnet; 77. Stabilizing spring. DETAILED DESCRIPTION

[0053] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0054] like Figures 1 to 8 As shown, the ground-to-air transient electromagnetic detection device of the present invention comprises a ground transmitting electrode, an aerial receiving electrode and an aviation device 1;

[0055] The ground transmitting electrode is used to inject a transient current of a high voltage pulse into the ground;

[0056] The aerial receiving electrode is installed on the aviation equipment 1, and the aerial receiving electrode is used to capture and measure the induced eddy current field;

[0057] The aerial receiving electrode includes a supporting frame, a cable 22 and a weight reduction mechanism;

[0058] The support frame is a circular ring-shaped structure composed of multiple sections of inflatable columns 2 and connectors 21 connected alternately, and the inflatable columns 2 are composed of a wear-resistant plastic layer and an airtight layer;

[0059] The cables 22 are laid along the support frame, and the cables 22 are bound and connected to the support frame by ropes;

[0060] A plurality of anti-torsion ropes are installed on the support frame, and the anti-torsion ropes are used to connect the support frame and the aviation equipment 1;

[0061] The weight reduction mechanism is used to reduce the weight of the aerial receiving electrode, and the weight reduction mechanism includes a wing 23 and a connecting belt 24;

[0062] The side wing 23 is a sheet-like structure, and the side wing 23 is made of elastic material. A filling cavity is provided in the side wing 23, and the filling cavity is filled with filling gas. The density of the filling gas is less than the density of air, and the buoyancy of the side wing 23 is less than the total gravity of the receiving electrode in the air.

[0063] The connecting belt 24 is fixedly mounted on the side wing 23 , and one end of the connecting belt 24 away from the side wing 23 is sleeved on the supporting frame.

[0064] The plurality of side wings 23 form a complete annular structure, and two adjacent side wings 23 are elastically connected via an elastic band 25 .

[0065] In the semi-aerial transient electromagnetic detection technology, the aerial equipment 1 is equipped with an anti-torsion rope to suspend the aerial receiving electrode in mid-air to receive the transient secondary electromagnetic field induced by the underground medium. In the overall process of the aerial receiving electrode rising, moving in the air, and suspending, the reduction in the weight of the aerial receiving electrode itself will not only reduce the requirements for the carrying capacity of the aerial equipment 1, but also reduce the endurance pressure of the aerial equipment 1. In the present invention, a weight-reducing mechanism is provided with a supporting frame of lightweight materials. On the one hand, the total weight of the aerial receiving electrode is effectively reduced by utilizing the reduction in the weight of the supporting frame and the buoyancy generated by the weight-reducing mechanism. On the other hand, the convenience of maintaining the shape of the aerial receiving electrode is effectively enhanced by supporting the supporting frame with high pressure in the supporting frame and the weight-reducing mechanism.

[0066] Specifically, during the detection process, the ground transmitting electrode is first installed at a pre-planned position. In the present invention, the ground transmitting electrode is composed of a transmitting coil, a transmitter and other components. By passing a transient current of a certain waveform through the transmitting coil, a transient electromagnetic field is generated around the transmitting coil under the action of the current. The electromagnetic field penetrates into the underground and induces current in the underground conductive medium. These induced currents decay over time to form a secondary induced eddy current field, which is finally observed by the aerial receiving electrode. In this process, the emission and reception of transient electromagnetic fields are common knowledge known to those skilled in the art, and will not be described in detail here. In order to reduce the operating pressure of the aviation equipment 1, the aerial receiving electrode in the present invention includes a support frame, a cable 22 And weight-reducing structure, in the present invention, the weight of the aerial receiving electrode is reduced from two aspects. One is that the cable 22 is installed with a frame structure to reduce the weight, that is, the improved supporting skeleton, and the other is that the buoyancy generated by the weight-reducing mechanism offsets the gravity of the cable 22, wherein the supporting skeleton is composed of multiple sections of inflatable columns 2 alternately connected with connecting pieces 21, wherein the inflatable column 2 is a double-layer cavity structure, the surface layer of the inflatable column 2 is supported by a wear-resistant plastic layer to enhance the wear resistance and strength of the inflatable column 2, thereby reducing the probability of damage to the inflatable column 2, and the air seal of the inner layer is composed of a thin film material with high sealing performance, so that the high-pressure gas filled in the inflatable column 2 will not leak, and under the support of the high-pressure gas, the strength of the inflatable column 2 meets the requirements, and then the connector 21 is equipped with The cables 22 are then tied to the inner ring surface of the support frame by ropes to provide support for the multi-turn ring coils formed by the cables 22. However, a large part of the weight of the aerial receiving electrode is provided by the coils formed by the multi-turn cables 22. Therefore, only reducing the weight of the support frame cannot significantly improve the weight of the aerial receiving electrode. Therefore, in the present invention, a weight-reducing mechanism is provided on the support frame. The weight-reducing structure is composed of a connecting belt 24 and a side wing 23. The side wing 23 is a sheet-like structure, and its thickness is relatively close to the thickness after the support frame and the cable 22 are combined. The side wing 23 is filled with a light gas, and the filling gas is preferably helium. Since the filling gas pressure inside the side wing 23 is close to the atmospheric pressure, under the action of the filling gas, the side wing 23 has The device has a tendency to float upward, and the connecting belt 24 connects the side wing 23 to the supporting frame, and then uses the buoyancy of the side wing 23 to offset part of the weight of the supporting frame and the cable 22, so that the total weight of the aerial receiving electrode is reduced, and when the side wings 23 are arranged, multiple side wings 23 form a ring structure and are arranged along the extension direction of the supporting frame, and the connecting effect of the connecting belt 24 makes the force of the side wings 23 on the supporting frame more uniform, and the multiple side wings 23 are connected by elastic belts 25, so that the multiple side wings 23 form a whole, which enhances the uniformity of supporting various parts of the supporting frame. When the aerial receiving electrode is suspended in the air, the aerial equipment 1 pulls the aerial receiving electrode through the anti-torsion rope, and cooperates with the buoyancy of the side wings 23 to evenly support the supporting frame.This effectively enhances the bearing capacity of the support frame, reduces the probability of the support frame being greatly deformed under the pressure of the cable 22, and makes the aerial receiving electrode more stable.

[0067] The present invention improves the aerial receiving electrode. In the process of semi-aerial transient electromagnetic detection, the supporting frame is formed by using a structure such as an inflatable column 2, and the side wings 23 support the supporting frame, thereby reducing the total weight of the aerial receiving electrode and reducing the burden on the aerial equipment 1. At the same time, due to the connection between the side wings 23 and the supporting frame, multiple side wings 23 support the supporting frame, thereby enhancing the supporting effect of the supporting frame, providing a stable frame structure for the coil formed by the cable 22, and maintaining the stability of the aerial receiving electrode.

[0068] As a preferred embodiment of the present invention, it also includes a deformation resistance reduction mechanism, which is installed on the weight reduction mechanism, and the deformation resistance reduction mechanism reduces the wind resistance of the aerial receiving electrode by changing the shape of the side wing 23;

[0069] The deformation resistance reduction mechanism includes a connecting pipe 3, a control rod 31, a support spring 32 and a traction rope 33;

[0070] The connecting members 21 are all equipped with connecting pipes 3, and the connecting pipes 3 are radially arranged outward from the center of the supporting frame;

[0071] The control rod 31 is installed at the end of the connecting pipe 3. A support spring 32 is fixedly installed in the inner cavity of the connecting pipe 3. The control rod 31 extends into the inner cavity of the connecting pipe 3 and is fixedly connected to the support spring 32.

[0072] The side wings 23 are all located below the connecting tube 3, and one end of the side wings 23 away from the supporting frame is connected to the control rod 31;

[0073] The traction rope 33 is fixedly mounted on the control rod 31 , and a steering ring 34 is fixedly mounted on the connecting member 21 . The traction rope 33 passes over the steering ring 34 and then extends to the aviation equipment 1 .

[0074] The deformation resistance reduction mechanism also includes a strong spring 4, a rotating cylinder 42 and a lifting block 41;

[0075] The rotating cylinder 42 is a cylindrical structure with an opening at the top, a strong spring 4 is fixedly installed in the rotating cylinder 42, and a lifting block 41 is fixedly installed at the end of the strong spring 4;

[0076] The anti-torsion rope includes a suspension rope 5 and a dispersion rope 51. The suspension rope 5 is used to fix the lifting block 41 to the aviation equipment 1, and the dispersion rope 51 is used to fix the transfer cylinder 42 to the support frame.

[0077] A through hole 43 is formed in the middle of the middle rotating cylinder 42, and the traction rope 33 extends into the middle rotating cylinder 42 through the through hole 43, and the traction rope 33 is fixedly connected to the lifting block 41;

[0078] When the aerial receiving electrode is suspended in the air, the lifting block 41 is flush with the through hole 43 .

[0079] Since the wing 23 is in a sheet-like structure and is connected to the supporting frame, the contact area between the aerial receiving electrode and the air increases and the windward surface increases when the aerial receiving electrode moves. This will cause the wind resistance of the aerial receiving electrode to increase when the aerial receiving electrode moves. In order to reduce the influence of the weight reduction mechanism on the wind resistance of the aerial receiving electrode, a deformation resistance reduction mechanism is provided in the present invention, which adjusts the shape of the wing 23 to reduce the wind resistance of the aerial receiving electrode when it moves.

[0080] Specifically, the deformation resistance reduction mechanism includes a connecting tube 3, a control rod 31, a support spring 32, a traction rope 33, a strong spring 4, a rotating cylinder 42 and a lifting block 41, wherein the connecting tube 3 is installed on the connecting piece 21 and extends outward along the center of the supporting frame, and the multiple connecting tubes 3 are elastically connected to the control rod 31 through the support spring 32, and the sheet-like side wings 23 are connected to the control rod 31. At the same time, a traction rope 33 is installed at the end of the control rod 31. By pulling the traction rope 33, the total length of the control rod 31 and the connecting tube 3 can be changed. It should be noted that in the present invention, the control rod 31, The connecting tube 3 and the supporting spring 32 constitute an elastic telescopic rod. In actual application, the staff can select a suitable number of connecting tubes 3 according to the telescopic multiple, wherein the control rod 31 is located at the end of the elastic telescopic rod, and the multiple connecting tubes 3 are mutually sleeved. Since one side of the wing 23 is connected to the control rod 31 and the other side is connected to the supporting frame through the connecting belt 24, when the total length of the control rod 31 and the connecting tube 3 changes, the distance between the two sides of the wing 23 is shortened, causing the middle part of the wing 23 to bulge, changing from a sheet-like structure to an arc-shaped structure. When the aerial device 1 drags the aerial receiving electrode to float or fall, the aerial device 1 The device 1 directly pulls the lifting block 41 through the suspension rope 5, and the lifting block 41 is connected to the rotating cylinder 42 through the strong spring 4. In the initial state, when the aerial device 1 is hovering, the lifting block 41 is aligned with the through hole 43 on the rotating cylinder 42 under the pull of the weight of the aerial receiving electrode. When the aerial device 1 rises or falls, under the action of wind resistance, there is a difference in the movement rate of the aerial device 1 and the aerial receiving electrode. Under the pull of the strong spring 4, the lifting block 41 rises or falls in the rotating cylinder 42, thereby causing the lifting block 41 to be misaligned with the through hole 43 and extend into the rotating cylinder 42 through the through hole 43. The traction rope 33 is pulled, thereby deforming the wing 23. After the deformation, the windward surface of the wing 23 in the horizontal direction is reduced, and the windward surface in the vertical direction is increased, thereby reducing the wind resistance of the aerial receiving electrode during the ascent or descent process. At the same time, since the wing 23 is located below the connecting tube 3, when the middle part of the wing 23 is raised, when the aerial receiving electrode falls to the ground, the raised middle part of the wing 23 first contacts the ground, and the gas-filled wing 23 is used to buffer the impact generated during the landing, which can effectively enhance the stability of the aerial receiving electrode when it falls to the ground and reduce the probability of damage to the aerial receiving electrode.

[0081] The present invention provides a deformation resistance reduction mechanism, and during the ascent or descent of the aerial receiving electrode and the aviation equipment 1, the shape of the wing 23 is changed, thereby adjusting the size of the windward surface of the wing 23, and further adjusting the wind resistance caused by the movement of the aerial receiving electrode. This can not only effectively reduce the influence of wind resistance on the movement of the aerial receiving electrode, but also utilize the deformed wing 23 to protect and buffer the supporting frame and the cable 22, thereby reducing the probability of equipment damage.

[0082] As a preferred embodiment of the present invention, a thread groove 6 is provided at the bottom of the rotating cylinder 42, an adjustment block 61 is installed in the inner thread of the thread groove 6, and the strong spring 4 is fixedly installed on the adjustment block 61, and the adjustment block 61 is used to adjust the starting position of the strong spring 4.

[0083] A limiting ring 62 is disposed at the top of the rotating cylinder 42 , and the inner diameter of the limiting ring 62 is smaller than the outer diameter of the lifting block 41 .

[0084] During the long-term use of the strong spring 4, its total length and elastic strength change. Therefore, the staff can twist the adjusting block 61 to make the adjusting block 61 rise or fall in the threaded groove 6, so that when the aerial receiving electrode is suspended and stationary, the lifting block 41 is always aligned with the through hole 43. The setting of the limiting ring 62 limits the maximum movement distance of the lifting block 41. When there is extreme climate such as strong wind in the environment, the probability of separation of the suspension rope 5 and the dispersion rope 51 can be reduced.

[0085] As a preferred embodiment of the present invention, an arc-shaped hole 63 is opened on the connecting tube 3, and a push rod 64 is slidably installed in the arc-shaped hole 63. The push rod 64 is made of elastic material, one end of the push rod 64 extends to the outside of the connecting tube 3, and the other end extends to the inside of the connecting tube 3. A top plate 65 is fixedly installed at one end of the push rod 64 outside the connecting tube 3, and one end of the push rod 64 inside the connecting tube 3 is fixedly connected to the control rod 31.

[0086] During the process of shortening the total length of the control rod 31 and the connecting tube 3, the push rod 64 gradually extends into the arc hole 63 and extends from the other end of the arc hole 63 to the outside of the connecting tube 3. The push rod 64 pushes the top plate 65 to move, pushing the middle part of the side wing 23, thereby facilitating the bulging of the middle part of the side wing 23.

[0087] As a preferred embodiment of the present invention, the connecting member 21 is sequentially provided with a rotating groove 7, a limiting groove 71 and a swinging groove 72, the connecting tube 3 is rotatably connected to the connecting member 21 through the rotating groove 7, the connecting tube 3 is provided with a telescopic groove 73, a clamping strip 74 is elastically connected to the telescopic groove 73 through a spring, the clamping strip 74 matches the limiting groove 71, a swing rod 75 is rotatably installed at the top of the swinging groove 72, a strong magnet 76 is fixedly installed at the bottom of the swing rod 75, the clamping strip 74 is made of ferromagnetic material, and when the supporting frame is in a horizontal state, the strong magnet 76 is aligned with the limiting groove 71, and the clamping strip 74 enters the limiting groove 71.

[0088] A stabilizing spring 77 is fixedly installed in the rotating groove 7 . The stabilizing spring 77 extends to the connecting pipe 3 . The stabilizing spring 77 is used to control the alignment of the clamping strip 74 and the telescopic groove 73 .

[0089] When the aerial device 1 drags the aerial receiving electrode to move, the aerial receiving electrode is not always in a horizontal state. When the aerial device 1 drags the aerial receiving electrode at a low horizontal movement speed, under the influence of airflow and drag force, the wind resistance is small, and the aerial receiving electrode moves stably horizontally. When the aerial device 1 moves at a faster speed, as the movement speed of the aerial receiving electrode increases, its movement resistance increases, causing the aerial receiving electrode to tilt. As the aerial receiving electrode tilts, the swing rod 75 in the swing slot 72 moves. Since the swing plate is located inside the swing slot 72, it is not affected by the airflow but only by gravity. Therefore, the bottom end of the swing rod 75 is always facing the ground. Therefore, when the support frame tilts, the strong magnet 76 is misaligned with the limiting groove 71, and the clamping strip 74 attracted by the strong magnet 76 retracts under the pull of the spring inside the telescopic groove 73, thereby separating the clamping strip 74 from the limiting groove 71. At this time, the connecting tube 3 can rotate in the rotating groove 7. Under the influence of airflow and drag force, the connecting tube 3 and the side wing 23 push the stabilizing spring 77 by themselves, thereby reducing the movement resistance of the aerial receiving electrode as much as possible. When the aerial receiving electrode is stationary, the connecting tube 3 and the side wing 23 are restored to their original positions under the support of the stabilizing springs 77 on both sides. Subsequently, when the supporting frame is horizontal, the strong magnet 76 is aligned with the limiting groove 71, causing the clamping strip 74 to re-enter the limiting groove 71, thereby fixing the supporting frame and the connecting tube 3 again.

[0090] like Fig. 9 As shown, the ground-to-air transient electromagnetic detection method comprises the following steps:

[0091] S1: Set up the ground transmitting electrode on the ground surface and adjust its position to optimize the detection point;

[0092] S2: Connect the aerial device 1 to the aerial receiving electrode, and lift the aerial receiving electrode into the air using the anti-torsion rope with the help of the traction force of the aerial device 1;

[0093] S3: The ground transmitting electrode injects a transient current of high voltage pulse into the ground, thereby exciting a pulse electromagnetic field;

[0094] S4: During the intervals of the pulsed magnetic field, the aerial receiving electrodes are responsible for monitoring the transient secondary electromagnetic field induced by the underground medium and deducing the detection results based on the acquired data.

[0095] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A ground-to-air transient electromagnetic detection device, comprising a ground transmitting electrode, an aerial receiving electrode and an aerial device (1); The ground transmitting electrode is used to inject a transient current of a high voltage pulse into the ground; The aerial receiving electrode is installed on the aviation equipment (1), and the aerial receiving electrode is used to capture and measure the induced eddy current field; Features: The aerial receiving electrode comprises a supporting frame, a cable (22) and a weight reduction mechanism; The support frame is a circular ring-shaped structure formed by alternatingly connecting multiple sections of inflatable columns (2) and connecting pieces (21), wherein the inflatable columns (2) are composed of a wear-resistant plastic layer and an airtight layer; The cables (22) are laid along the supporting frame, and the cables (22) are bound and connected to the supporting frame via ropes; A plurality of anti-torsion ropes are installed on the support frame, and the anti-torsion ropes are used to connect the support frame and the aviation equipment (1); The weight reduction mechanism is used to reduce the weight of the aerial receiving electrode, and the weight reduction mechanism comprises side wings (23) and a connecting belt (24); The side wing (23) is a sheet-like structure, the side wing (23) is made of elastic material, a filling cavity is provided in the side wing (23), the filling cavity is filled with filling gas, the filling gas density is less than the air density, and the buoyancy of the side wing (23) is less than the total gravity of the receiving electrode in the air; The connecting belt (24) is fixedly mounted on the side wing (23), and one end of the connecting belt (24) away from the side wing (23) is sleeved on the supporting frame.

2. The ground-to-air transient electromagnetic detection device according to claim 1, characterized in that: The plurality of side wings (23) form a complete annular structure, and two adjacent side wings (23) are elastically connected via an elastic band (25).

3. The ground-to-air transient electromagnetic detection device according to claim 2, characterized in that: It also includes a deformation resistance reduction mechanism, which is installed on the weight reduction mechanism, and the deformation resistance reduction mechanism reduces the wind resistance of the aerial receiving electrode by changing the shape of the side wing (23); The deformation resistance reduction mechanism comprises a connecting pipe (3), a control rod (31), a support spring (32) and a traction rope (33); The connecting pieces (21) are all provided with connecting pipes (3), and the connecting pipes (3) are radially arranged outward from the center of the supporting frame; The control rod (31) is installed at the end of the connecting tube (3), a support spring (32) is fixedly installed in the inner cavity of the connecting tube (3), and the control rod (31) extends into the inner cavity of the connecting tube (3) and is fixedly connected to the support spring (32); The side wings (23) are all located below the connecting tube (3), and one end of the side wings (23) away from the supporting frame is connected to the control rod (31); The traction rope (33) is fixedly mounted on the control rod (31), a steering ring (34) is fixedly mounted on the connecting member (21), and the traction rope (33) passes around the steering ring (34) and then extends to the aviation equipment (1).

4. The ground-to-air transient electromagnetic detection device according to claim 3, characterized in that: The deformation resistance reduction mechanism also includes a strong spring (4), a rotating cylinder (42) and a lifting block (41); The rotating cylinder (42) is a cylindrical structure with an opening at the top, a strong spring (4) is fixedly installed in the rotating cylinder (42), and a lifting block (41) is fixedly installed at the end of the strong spring (4); The anti-torsion rope comprises a suspension rope (5) and a dispersion rope (51), wherein the suspension rope (5) fixedly connects the lifting block (41) to the aviation equipment (1), and the dispersion rope (51) fixedly connects the transfer cylinder (42) to the supporting frame; A through hole (43) is provided in the middle of the middle rotating cylinder (42), and the traction rope (33) extends into the middle rotating cylinder (42) through the through hole (43), and the traction rope (33) is fixedly connected to the lifting block (41); When the aerial receiving electrode is suspended in the air, the lifting block (41) is flush with the through hole (43).

5. The ground-to-air transient electromagnetic detection device according to claim 4, characterized in that: A thread groove (6) is provided at the bottom of the rotating cylinder (42), an adjusting block (61) is installed in the inner thread of the thread groove (6), the powerful spring (4) is fixedly installed on the adjusting block (61), and the adjusting block (61) is used to adjust the starting position of the powerful spring (4).

6. The ground-to-air transient electromagnetic detection device according to claim 5, characterized in that: A limiting ring (62) is provided at the top of the rotating cylinder (42), and the inner diameter of the limiting ring (62) is smaller than the outer diameter of the lifting block (41).

7. The ground-to-air transient electromagnetic detection device according to claim 6, characterized in that: The connecting tube (3) is provided with an arc-shaped hole (63), a push rod (64) is slidably mounted in the arc-shaped hole (63), the push rod (64) is made of elastic material, one end of the push rod (64) extends outside the connecting tube (3), and the other end extends inside the connecting tube (3), a top plate (65) is fixedly mounted on one end of the push rod (64) outside the connecting tube (3), and one end of the push rod (64) inside the connecting tube (3) is fixedly connected to the control rod (31).

8. The ground-to-air transient electromagnetic detection device according to claim 7, characterized in that: The connecting member (21) is provided with a rotation groove (7), a limiting groove (71) and a swinging groove (72) in sequence. The connecting tube (3) is rotatably connected to the connecting member (21) through the rotation groove (7). The connecting tube (3) is provided with a telescopic groove (73). A clamping strip (74) is elastically connected to the telescopic groove (73) through a spring. The clamping strip (74) matches the limiting groove (71). A swinging rod (75) is rotatably mounted on the top end of the swinging groove (72). A strong magnet (76) is fixedly mounted on the bottom end of the swinging rod (75). The clamping strip (74) is made of ferromagnetic material. When the supporting frame is in a horizontal state, the strong magnet (76) is aligned with the limiting groove (71), and the clamping strip (74) enters the limiting groove (71).

9. The ground-to-air transient electromagnetic detection device according to claim 8, characterized in that: A stabilizing spring (77) is fixedly installed in the rotating groove (7), and the stabilizing spring (77) extends to the connecting pipe (3). The stabilizing spring (77) is used to control the alignment of the clamping strip (74) and the telescopic groove (73).

10. A ground-to-air transient electromagnetic detection method, characterized in that: The method is applicable to the ground-to-air transient electromagnetic detection device according to claim 9, and the method comprises the following steps: S1: Set up the ground transmitting electrode on the ground surface and adjust its position to optimize the detection point; S2: connecting the aerial device (1) to the aerial receiving electrode, and using the traction force of the aerial device (1) to lift the aerial receiving electrode into the air using an anti-torsion rope; S3: The ground transmitting electrode injects a transient current of high voltage pulse into the ground, thereby exciting a pulse electromagnetic field; S4: During the intervals of the pulsed magnetic field, the aerial receiving electrodes are responsible for monitoring the transient secondary electromagnetic field induced by the underground medium and deducing the detection results based on the acquired data.

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