An electromagnetic surveying apparatus platform for use in shallow water and a method of launching and recovering the same

Abstract

A kind of water bottom electromagnetic detection equipment platform and its launching and recovery method, including upper top plate, middle layer plate and lower bottom plate from top to bottom in turn, the three layers of plate fixed connection constitute square fixed plate, limit space is arranged between upper top plate and lower bottom plate, electromagnetic detection equipment is installed in the limit space, the electromagnetic detection equipment contains several sensors and measurement arm I, measurement arm II, measurement arm III, measurement arm IV respectively extend outward along the diagonal direction of the four corners of the square fixed plate, can significantly improve the recovery reliability, operation flexibility and task success rate of water bottom electromagnetic detection equipment in complex shallow water environment. The platform is connected by releasing structure and platform using buoyancy cylinder, the recovery of the platform is realized, transducer release, timing release, electromagnetic signal release three independent release modes are integrated on the same platform, the recovery success rate and task reliability of seabed electromagnetic detection equipment in complex environment are significantly improved.

Description

Technical Field

[0001] This invention belongs to the field of marine electromagnetic detection technology, specifically relating to an underwater electromagnetic detection equipment platform for shallow water environments. Background Technology

[0002] Marine electromagnetic methods (MES), as a cutting-edge marine geophysical exploration technology, play a crucial role in seafloor oil and gas resource exploration, hydrate surveys, and the study of deep-sea lithosphere structures. Currently, the application of MES in deep water is relatively mature, primarily based on controlled-source electromagnetic methods. Deep-water environments offer virtually no air wave interference, allowing electromagnetic signals to clearly reflect resistivity differences in seafloor strata. However, the application of MES in shallow water faces unique technical challenges, such as the deployment and retrieval of electromagnetic detection equipment and air wave interference.

[0003] In shallow water exploration operations, the deployment and retrieval of electromagnetic detection equipment are crucial. For electromagnetic receivers, proper release and retrieval are fundamental to data acquisition. However, this process faces numerous engineering challenges. For instance, most existing release methods rely on a single trigger mode. If acoustic release alone fails, the equipment cannot be retrieved, resulting in significant economic losses. Although reports indicate that acoustic release technology has achieved high retrieval rates under certain conditions, it still operates on a single trigger mode, and the inherent reliability risks remain unresolved.

[0004] Existing platform designs are not optimized for the hydrodynamic characteristics of shallow water environments. When disturbed by water flow in shallow water areas, the platform is prone to lateral drift, leading to decreased deployment accuracy and even deviation from the intended detection area. Existing platforms extensively utilize metal materials, and these metal components can generate electromagnetic interference with sensitive elements such as magnetic probes and magnetic rods during underwater electromagnetic detection, affecting the authenticity and accuracy of the detection data. Most existing release methods are based on a single trigger mode; failure of the release device will render the equipment unrecoverable. Water flow interference is a significant problem in shallow water environments, and traditional platform designs are not optimized for the hydrodynamic characteristics of shallow water. In particular, metal materials can cause electromagnetic signal interference.

[0005] Therefore, there is an urgent need in the existing technology for a technical solution for underwater electromagnetic detection that can significantly improve the above problems by evolving from a single triggering mode to a multi-triggering mode and by addressing issues in terms of anti-water flow design and the application of non-metallic materials. Summary of the Invention

[0006] Based on the technical problems existing in the prior art, the present invention aims to provide an underwater electromagnetic detection equipment platform and its deployment and retrieval method, which can significantly improve the retrieval reliability, operational flexibility, and mission success rate of underwater electromagnetic detection equipment in complex shallow water environments. Specifically, according to one aspect of the present invention, an underwater electromagnetic detection equipment platform is provided, the main structure of which includes an upper top plate, a middle plate, and a lower bottom plate stacked sequentially from top to bottom. These three plates are fixedly connected to form a square fixing plate, and the overall framework of the present invention adopts a flat platform design. This three-layer flat structure design can reduce the impact of water flow on the platform and maximize the platform's balance. The platform restricts the vertical movement of the measuring arm through the cooperation of the upper top plate, middle plate, and lower bottom plate. A limiting space is set between the upper top plate and the lower bottom plate. An electromagnetic detection device is installed in this limiting space. The electromagnetic detection device includes several sensors and measuring arms I, II, III, and IV extending outward along the diagonal directions of the four corners of the square fixed plate. The vertical movement of the four measuring arms is restricted by the cooperation of the upper top plate, the middle plate, and the lower bottom plate. The upper top plate presses down on the upper end of the measuring arm, and the lower bottom plate supports the lower end of the measuring arm. Two screws are used to fix the measuring arm to the lower bottom plate through the measuring arm and the lower bottom plate, thus restricting its horizontal movement.

[0007] Furthermore, grooves are set diagonally on the top plate, middle plate, and bottom plate respectively. Measuring arms I, II, III, and IV are placed in the four grooves to restrict the vertical movement of the four measuring arms. Two screws are used to pass through the measuring arms and the bottom plate to fix the measuring arms to the bottom plate to restrict the horizontal movement of the four measuring arms. This achieves precise positioning of the measuring arms and ensures the stability of the electromagnetic detection equipment in the platform.

[0008] Furthermore, the overall structure of the underwater electromagnetic detection equipment platform provided by this invention is made of non-metallic materials, which can effectively reduce the interference of the platform itself on the electromagnetic detection signal, ensure the authenticity and reliability of the data collected by detection elements such as magnetic rods and fluxgate magnetometers, and improve the accuracy of the detection results. Preferably, the non-metallic material is one or more of PE, ABS, FRP, PU, ​​HDPE, and concrete.

[0009] Furthermore, the platform also includes a buoyancy cylinder, which is connected to the platform via a release structure to enable the platform to be recovered.

[0010] The underwater electromagnetic detection equipment platform also includes a release mechanism, which includes an electromagnet release device (3), a release controller mounting plate (51), and a release controller (52); the release controller (52), the release controller mounting plate (51), and the electromagnet release device (3) are mounted on the upper top plate (41); the electromagnet release device (3) includes a fixed end (35), a release end (31), a buoyancy cylinder (34), a fixed rod (33), an electromagnet release device (32), and an electromagnet fixing rod (36); the fixed end (35) is composed of a cylinder and a fixing plate; the fixing rod (33) is a long rod; the buoyancy cylinder (34) is movably fitted on the long rod of the fixing rod (33); one end of the fixing plate on the fixed end (35) is fixed to the upper top plate (41) by screws; the other end of the fixing rod (33) is placed on the recess of the release end (31), and the electromagnet release device (32) is fixed to the recess by the electromagnet fixing rod (36).

[0011] Furthermore, the platform utilizes the unhooking device (not shown) of the shipborne crane to connect to the lifting rings set on the upper top plate, thereby enabling the platform to be deployed in the water and to be retrieved by releasing the buoyancy cylinder.

[0012] Furthermore, the release method of the release structure can be a transducer release method, that is, before the platform is deployed, the characteristics of the acoustic signal generated by the transducer are preset; the release controller is in a standby listening state; when the release controller (52) receives the preset specific acoustic signal and confirms that the instruction is valid, it controls the electromagnet release device to act, the buoyancy cylinder is separated from the release end, and the buoyancy cylinder floats up under its own buoyancy; during recovery, the personnel on the water can recover the platform by salvaging the buoyancy cylinder.

[0013] Furthermore, the release structure can be released in a timed manner. That is, before deployment, the operator sets the target release time through the interface; after the platform enters the water, the timer control unit set on the platform keeps the timer running; when the internal timer of the timer control unit reaches the preset time, the control module in the acquisition chamber sends a release command to the release controller; the release controller drives the electromagnet release device to detach from the buoyancy cylinder, causing the buoyancy cylinder to float; during recovery, personnel on the water can retrieve the buoyancy cylinder to recover the platform.

[0014] Furthermore, the release structure can also be released via electromagnetic signals. Specifically, before deployment, the characteristics of an artificial electromagnetic signal are preset. After the platform enters the water, the transmitter's electrical signal is received by the electrode at the tail end of the measuring arm, and then processed by the acquisition chamber. When a specific artificial electrical signal is detected, a trigger command is sent to the release controller via a control module located in the acquisition chamber on the fourth side of the square fixed plate. The release controller then drives the electromagnet to release, causing the buoyancy cylinder to detach and float. Personnel on the water can then retrieve the buoyancy cylinder and recover the platform.

[0015] Furthermore, the present invention is equipped with cement blocks to increase load-bearing capacity, making it flexible and environmentally friendly. The bottom plate (43) of the present invention is equipped with cement blocks (44). By equipping cement blocks 44 of different volumes and weights, the platform can be balanced. The cement blocks are small in size, making them easy to transport and install. Moreover, the cement blocks 44 are non-magnetic and can be reused multiple times, saving costs. This ensures that the platform is green and environmentally friendly during deployment and recycling, leaving no residue and not polluting water resources.

[0016] According to another aspect of the present invention, the present invention also provides a method for deploying and recovering an underwater electromagnetic detection device platform as described above, comprising the following steps: First, the platform is deployed in the water by connecting the lifting rings on the upper plate using the release hook of the ship-mounted crane. Then, the platform is retrieved by releasing the buoyancy cylinder. The release of the buoyancy cylinder is accomplished through any one or any combination of the following three methods: (1) Transducer release: Before the platform is deployed, the characteristics of the acoustic signal generated by the transducer are preset; the release controller is in standby listening state; when the release controller receives a specific acoustic signal and confirms that the instruction is valid, it controls the electromagnet release device to act, the buoyancy cylinder is separated from the release end, and the buoyancy cylinder floats up under its own buoyancy; during recovery, the personnel on the water surface can recover the platform by salvaging the buoyancy cylinder. (2) Timed release: Before deployment, the operator sets the target release time through the interface; after the platform enters the water, the timed control unit set on the platform keeps the timer; when the internal timer of the timed control unit reaches the preset time, the control module in the acquisition chamber sends a release command to the release controller; the release controller drives the electromagnet release device to act, so that the buoyancy cylinder is detached and floats up; during recovery, the personnel on the water surface can retrieve the buoyancy cylinder to realize the recovery of the platform.

[0017] (3) Electromagnetic signal release: Before deployment, the characteristics of artificial electromagnetic signals are preset; after the platform enters the water, the transmitter electrical signal is received by the electrode at the tail end of the measuring arm, and then the transmitter electrical signal is processed by the acquisition cabin; when a specific artificial electrical signal is identified, the control module in the acquisition cabin arranged on the fourth side of the square fixed plate sends a trigger command to the release controller; the release controller drives the electromagnet release device to act, so that the buoyancy cylinder is detached and the buoyancy cylinder floats up; personnel on the water surface retrieve the buoyancy cylinder and recover the platform.

[0018] The underwater electromagnetic detection equipment platform and its deployment and retrieval method provided by the present invention have at least the following beneficial effects: 1. Employing three release modes significantly improves recovery reliability. This invention integrates three independent release methods—transducer release, timed release, and electromagnetic signal release—on the same platform. If one release method fails, the platform can still be recovered using the other two methods, significantly improving the success rate and mission reliability of seabed electromagnetic detection equipment in complex environments.

[0019] 2. The present invention designs the platform as a flat shape, which significantly reduces the water-facing surface of the platform and effectively reduces the impact and swaying interference of hydrodynamics on the platform. This allows the platform to sink faster and smoothly insert into the bottom silt or sediment layer, thereby improving the deployment accuracy and detection stability of electromagnetic detection equipment in shallow water environments.

[0020] 3. No electromagnetic compatibility design scheme for the overall materials of the platform has been found in the existing technology. The overall structure of the platform of this invention is made of non-metallic materials, which can effectively reduce the interference of the platform itself on the electromagnetic detection signal, ensure the authenticity and reliability of the data collected by the detection elements such as the magnetic rod and fluxgate magnetometer, and improve the accuracy of the detection results.

[0021] 4. This invention features independently installed cement blocks at the bottom of the fixed plate. Cement blocks of varying sizes and weights can be flexibly configured to adjust the platform's balance based on the weight of the electromagnetic detection equipment and the installation position of the platform's intelligent release device. These cement blocks are small, easy to transport and install, and are made of non-magnetic material, allowing for repeated use. During deployment and retrieval, the entire platform is recovered together, leaving no residue on the water's bottom. This environmentally friendly and reusable method does not pollute water resources. In contrast, existing release methods often leave counterweights on the bottom of the water, impacting the environment.

[0022] In summary, this invention has evolved from the traditional "single trigger mode" to a "multi-mode intelligent release system." Technically, it has achieved the parallel implementation of three modes: single acoustic release, transducer release, timed release, and electromagnetic signal release. Furthermore, it has made effective improvements in electromagnetic signal triggering, flat anti-water flow design, application of non-metallic materials, and green environmental protection. This significantly improves the reliability, operational flexibility, and mission success rate of underwater electromagnetic detection equipment in complex shallow water environments. Attached Figure Description

[0023] Figure 1 This is a top view of an underwater electromagnetic detection equipment platform according to a specific embodiment of the present invention.

[0024] Figure 2 This is a front view showing the overall plate structure of an underwater electromagnetic detection equipment platform according to a specific embodiment of the present invention.

[0025] Figure 3This is a schematic diagram illustrating the structure of the release end 31 and the fixed end 35 of the underwater electromagnetic detection equipment platform according to a specific embodiment of the present invention.

[0026] Figure 4 This is to illustrate the structural schematic diagram of the electrode device 53 installed at the end of the measuring arm of the underwater electromagnetic detection equipment platform according to a specific embodiment of the present invention, as well as the structural schematic diagram of each part of the electrode device.

[0027] Figure 5 This is to illustrate the release method of an underwater electromagnetic detection equipment platform according to a specific embodiment of the present invention.

[0028] Reference numerals: 3-Electromagnetic release device; 4-Fixing plate; 31-Release end; 32-Electromagnetic release device; 33-Fixing rod; 34-Buoyancy cylinder; 35-Fixing end; 36-Electromagnetic fixing rod; 37-Measuring arm I; 38-Measuring arm II; 39-Measuring arm III; 40-Measuring arm IV; 41-Upper top plate; 42-Middle layer plate; 43-Lower bottom plate; 44-Cement block; 45-Lifting ring I; 46-Lifting ring II; 47-Lifting ring III; 48-Lifting ring; 49-Rope; IV; 51-Release controller mounting plate; 52-Release controller; 53-Electrode device; 54-Electrode fixing head; 53-Electrode fixing cover; 53-Electrode load block; 61-Attitude bar; 62-Magnetic bar I; 63-Magnetic bar II; 64-Fluorescence gate magnetometer; 65-Data acquisition chamber; Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Those skilled in the art will understand that this description is exemplary and the present invention is not limited to these specific embodiments.

[0030] Figure 1 , 2 To illustrate the overall structure of an underwater electromagnetic detection equipment platform according to an embodiment of the present invention, Figure 1 This is a top view. Figure 2 This is an overall diagram of the slab structure. (Example) Figure 2 As shown, in terms of overall structure, the platform is assembled from an upper top plate (41), a middle layer plate (42), and a lower bottom plate (43). In this specific embodiment, all three layers are made of PE board and are fixed together by bolts. The material is not limited to PE board; it can also be one or more of ABS, FRP, PU, ​​HDPE, and concrete, as long as it meets the buoyancy requirements. If it is concrete, it must be made into a large, completely sealed, hollow structure.

[0031] like Figure 1As shown, the platform includes electromagnetic detection equipment. An example of how the electromagnetic detection equipment is installed is as follows: the electromagnetic detection equipment (including measuring arm I 37, measuring arm II 38, measuring arm III 39, measuring arm IV 40, and various sensors) is placed in the limiting space between the upper top plate 41 and the lower bottom plate 43. Grooves are set at the four opposite corners of the upper top plate (41), middle plate (42), and lower bottom plate (43) to hold the four measuring arms. The groove depth of the upper top plate (41) and lower bottom plate (43) is half the thickness of the plate. The groove in the middle plate (42) is completely excavated. The four measuring arms are placed in the four opposite corner grooves of the model to maintain balance. The acquisition chamber (65) is located on the right side of the platform and is also fixed in the groove. Inside the groove, the groove depth of the upper top plate (41) and the lower bottom plate (43) is half the thickness of the layer plate, while the groove of the middle layer plate (42) is completely excavated; Magnetic rod I and magnetic rod II are located on the upper and left sides of the platform, respectively. The groove depth of the upper top plate (41) and the lower bottom plate (43) is half the thickness of the layer plate, while the groove of the middle layer plate (42) is completely excavated. At the same time, the side of the middle layer plate (42) is also completely hollowed out for easy placement and removal; the fluxgate magnetometer and attitude bar are located on the lower side of the platform, respectively. The groove depth of the upper top plate (41) and the lower bottom plate (43) is half the thickness of the layer plate, while the groove of the middle layer plate (42) is completely excavated. At the same time, the side of the middle layer plate (42) where the attitude bar is placed is hollowed out for easy placement and removal. The upper top plate 41 presses down on the upper end of the measuring arm, while the lower bottom plate 43 supports the lower end of the measuring arm upwards, restricting its vertical displacement. The screws installed on the middle layer plate 42 are driven into the measuring arm from above, restricting its horizontal movement.

[0032] like Figure 2 As shown, to ensure the stability of the platform on the water surface, a counterweight is also installed under the platform. Specifically, based on the weight of the electromagnetic detection equipment, an appropriate number of cement blocks 44 are selected and fixed in the slots (not shown) on the bottom surface of the lower base plate 43, and secured with screws and bolts.

[0033] In addition, such as Figure 3 As shown, electrode devices 53 are installed at the ends of measuring arms I 37, II 38, III 39, and IV 40, respectively, for detecting electrical signals.

[0034] The electrode device 53 includes an electrode fixing head 54, an electrode fixing cover 55, and an electrode weight block 56.

[0035] The following reference Figure 4 The platform's deployment and recycling processes are explained in detail.

[0036] like Figure 4 As shown, a rope (not shown) is passed through rings I 45, II 46, III 47, and IV 48 respectively. Figure 1(Selected from the bid), gather the ropes and connect them to the hook of the shipborne crane (not shown). Lift the platform and slowly lower it into the water. After the platform enters the water, attitude bar 61 (in...) Figure 1 The winning bidder will transmit the platform's horizontal status to the surface workers in real time. If the platform tilts, the workers will adjust the number or position of the cement blocks 44 to restore balance before lowering it again.

[0037] During platform recovery, the platform can release the buoyancy cylinder 34 through the three methods mentioned above, namely, (1) Transducer release: Before the platform is deployed, the characteristics of the acoustic signal generated by the transducer are preset; the release controller is in standby listening state; when the release controller (52) receives a specific acoustic signal and confirms that the instruction is valid, it controls the electromagnet release device to act, the buoyancy cylinder is separated from the release end, and the buoyancy cylinder floats up under its own buoyancy; during the recovery, the personnel on the water surface can realize the recovery of the platform by salvaging the buoyancy cylinder. (2) Timed release: Before deployment, the operator sets the target release time through the interface; after the platform enters the water, the timed control unit set on the platform keeps the timer running; when the internal timer of the timed control unit reaches the preset time, the control module in the acquisition chamber sends a release command to the release controller; the release controller drives the electromagnet release device to act, causing the buoyancy cylinder to detach and float up; during recovery, the personnel on the water surface can retrieve the buoyancy cylinder to realize the recovery of the platform.

[0038] (3) Electromagnetic signal release: Before deployment, the characteristics of artificial electromagnetic signals are preset; after the platform enters the water, the magnetic rod I, magnetic rod II and fluxgate magnetometer arranged on the three sides of the square fixed plate respectively receive and process the electrical signals; when a specific artificial electrical signal is identified, the transmitter electrical signal is received by the electrode arranged at the tail end of the measuring arm, and then the transmitter electrical signal is processed by the acquisition cabin; the release controller drives the electromagnet release device to act, so that the buoyancy cylinder is detached and the buoyancy cylinder floats up; the personnel on the water surface retrieve the buoyancy cylinder and recover the platform.

[0039] Then, the buoyancy cylinder 34 is manually retrieved for recovery.

[0040] The present invention has been described in detail above with reference to specific embodiments. Those skilled in the art will understand that various modifications and changes can be made, and as long as they do not depart from the spirit and purpose of the present invention, all such modifications and changes should fall within the protection scope of the present invention, which is defined by the appended claims.

Claims

1. An underwater electromagnetic detection equipment platform, characterized in that: The main structure of the platform includes an upper top plate, a middle plate, and a lower bottom plate stacked from top to bottom. These three plates are fixedly connected to form a square fixed plate. The platform is flat and can withstand the impact of water flow. The lower bottom plate is equipped with cement blocks of different volumes and weights to make the platform balanced.

2. The underwater electromagnetic detection equipment platform as described in claim 1, characterized in that, The platform's overall structure is made of non-metallic materials. A limiting space is set between the upper top plate and the lower bottom plate. An electromagnetic detection device is installed within this limiting space. The electromagnetic detection device includes several sensors and measuring arms I, II, III, and IV extending outward along the diagonal directions of the four corners of the square fixed plate. The upper top plate and the lower bottom plate cooperate to restrict the vertical movement of the four measuring arms. The upper top plate presses down on the upper end of the measuring arm, and the lower bottom plate supports the lower end of the measuring arm. Screws installed on the middle plate drive the measuring arms from above, restricting their horizontal movement.

3. The underwater electromagnetic detection equipment platform as described in claim 1, characterized in that, The platform also includes a buoyancy cylinder, which is connected to the platform via a release structure to enable the platform to be recovered.

4. The underwater electromagnetic detection equipment platform as described in claim 3, characterized in that, It also includes a release mechanism, the release structure comprising an electromagnet release device (3), a release controller mounting plate (51), and a release controller (52); the release controller (52), the release controller mounting plate (51), and the electromagnet release device (3) are mounted on the top plate (41); the electromagnet release device (3) includes a fixed end (35), a release end (31), a buoyancy cylinder (34), a fixing rod (33), an electromagnet release device (32), and an electromagnet fixing rod (36); the fixed end (35) 5) It consists of a cylinder and a fixing plate; the fixing rod (33) is a long rod; the buoyancy cylinder (34) is movably fitted on the long rod of the fixing rod (33); one end of the fixing plate on the fixing end (35) is fixed to the top plate (41) by screws; one end of the fixing rod (33) is hollowed out and looped on the cylinder of the fixing end (35), and the other end of the fixing rod (33) is placed on the notch of the release end (31), and the electromagnet release device (32) is fixed to the notch by the electromagnet fixing rod (36).

5. The underwater electromagnetic detection equipment platform as described in claim 4, characterized in that, The release structure is released in a transducer release mode, that is, before the platform is deployed, the characteristics of the acoustic signal generated by the transducer are preset. The release controller is in standby listening state; when the release controller (52) receives a specific sound signal and confirms that the instruction is valid, it controls the electromagnet release device to act, the release end separates from the fixed end, and the buoyancy tube floats up under its own buoyancy; during recovery, the surface personnel can recover the platform by salvaging the buoyancy tube.

6. The underwater electromagnetic detection equipment platform as described in claim 4, characterized in that, The release structure is released in a timed manner, that is, before deployment, the operator sets the target release time through the interface; after the platform enters the water, the timed control unit set on the platform keeps the timer running. When the internal timer of the timing control unit reaches the preset time, the control module in the acquisition chamber sends a release command to the release controller; the release controller drives the electromagnet release device to disengage the release end and the buoyancy tube floats up; during recovery, personnel on the water can retrieve the buoyancy tube to recover the platform.

7. The underwater electromagnetic detection equipment platform as described in claim 4, characterized in that, The release mechanism of the release structure is an electromagnetic signal release method. That is, before deployment, the characteristics of the artificial electromagnetic signal are preset. After the platform enters the water, the magnetic field signal is received and processed by magnetic rod I, magnetic rod II, and fluxgate sensors respectively arranged on the three sides of the square fixed plate. When a specific artificial electromagnetic signal is identified, the control module in the acquisition chamber arranged on the fourth side of the square fixed plate sends a trigger command to the release controller. The release controller drives the electromagnet release device to act, causing the release end to detach and the buoyancy cylinder to float. Personnel on the water surface retrieve the buoyancy cylinder and recover the platform.

8. The underwater electromagnetic detection equipment platform as described in claim 1, characterized in that, The vertical movement of the measuring arms is restricted by the cooperation of the upper top plate and the lower bottom plate. Grooves are set on the upper top plate (41), the middle plate (42), and the lower bottom plate (43) respectively. Measuring arms I, II, III, and IV are placed in the four grooves to restrict the vertical movement of the four measuring arms.

9. The underwater electromagnetic detection equipment platform as described in claim 8, characterized in that, The measuring arms are fixed to the bottom plate (43) by means of the middle plate and by means of screws to restrict the horizontal movement of the measuring arms. Two screws are used to pass through the four measuring arms and the bottom plate (43) to restrict the horizontal movement of the four measuring arms.

10. A method for deploying and recovering an underwater electromagnetic detection equipment platform as described in any one of claims 1-9, comprising the following steps: First, the platform is deployed in the water by connecting the lifting rings on the upper plate using the release hook of the ship-mounted crane. Then, the platform is retrieved by releasing the buoyancy cylinders. The action of releasing the buoyancy cylinder is accomplished by any one or any combination of the following three methods: (1) Transducer release: Before the platform is deployed, the characteristics of the acoustic signal generated by the transducer are preset; the release controller is in standby listening state; when the release controller (52) receives a specific acoustic signal and confirms that the instruction is valid, it controls the electromagnet release device to act, the buoyancy cylinder is separated from the release end, and the buoyancy cylinder floats up under its own buoyancy; during the recovery, the personnel on the water surface can realize the recovery of the platform by salvaging the buoyancy cylinder. (2) Timed release: Before deployment, the operator sets the target release time through the interface; after the platform enters the water, the timed control unit set on the platform keeps the timer running. When the internal timer of the timing control unit reaches the preset time, the control module in the acquisition chamber sends a release command to the release controller; the release controller drives the electromagnet release device to act, causing the buoyancy cylinder to detach and float up; during recovery, personnel on the water can retrieve the buoyancy cylinder to recover the platform. (3) Electromagnetic signal release: Before deployment, the characteristics of artificial electromagnetic signals are preset; after the platform enters the water, the magnetic rod I, magnetic rod II and fluxgate magnetometer arranged on the three sides of the square fixed plate respectively receive and process the electrical signals; when a specific artificial electromagnetic signal is identified, the control module in the acquisition chamber arranged on the fourth side of the square fixed plate sends a trigger command to the release controller; the release controller drives the electromagnet release device to act, so that the buoyancy cylinder is detached and floats up; personnel on the water surface retrieve the buoyancy cylinder and recover the platform.

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