Receiving and releasing device for very low frequency transmitting antenna

Abstract

The invention discloses a receiving and releasing device for a very-low-frequency transmitting antenna, and belongs to the technical field of very-low-frequency transmitting antennas. The winding and unwinding device comprises a rack, a winding displacement assembly and a winding drum assembly. The rack is of a U-shaped structure; the wire arranging assembly comprises a driving unit and a connecting block, and the driving unit is located on the rack; the winding drum assembly comprises a first motor, a winding drum, a swing arm and a fixed pulley, the first motor is located on one side plate of the rack and is in transmission connection with the winding drum, the swing arm is rotatably arranged on the connecting block, a rotating shaft of the swing arm is arranged in the first direction, and the fixed pulley is rotatably inserted into the swing arm; and the outer peripheral wall of the fixed pulley is provided with a wire slot for accommodating a very-low-frequency transmitting antenna. The winding and unwinding device for the very-low-frequency transmitting antenna is simple in structure, the occupied space is small after the very-low-frequency transmitting antenna is wound, and the problem that the very-low-frequency transmitting antenna is broken due to friction damage can be avoided.

Description

Technical Field

[0001] This invention belongs to the field of very low frequency (VLF) transmitting antenna technology, specifically relating to a receiving and transmitting device for a VLF transmitting antenna. Background Technology

[0002] Very low frequency (VLF) communication is a communication method that uses very low frequency radio waves for long-distance signal transmission. It features stable propagation, low loss, and resistance to nuclear explosions, and is widely used in deep-sea communication systems and in building minimal long-distance communication systems. A VLF communication system consists of a VLF transmitting system and a VLF receiving system, with the VLF transmitting antenna being the most important core component.

[0003] Currently, very low frequency (VLF) transmitting antennas primarily utilize aircraft as carrier platforms, requiring the deployment and retrieval of these antennas during high-speed flight. However, existing VLF transmitting antennas typically operate at ranges of 2000-3000 meters, involving high deployment and retrieval speeds and high overload conditions. Aircraft space is limited, conventional deployment and retrieval systems are complex, and the retrieved VLF antenna occupies a significant amount of space. Furthermore, the VLF antenna is highly susceptible to breakage due to friction under high-speed, overload conditions during deployment and retrieval. Summary of the Invention

[0004] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides a retraction and deployment device for very low frequency (VLF) transmitting antennas. Its purpose is to: not only have a simple structure and a small space occupation after the VLF transmitting antenna is retracted, but also ensure that, during high-speed retraction and deployment of a high-load VLF transmitting antenna, the fixed pulley rotates synchronously with the antenna, and the antenna remains tangent to the slot during high-speed retraction and deployment, thus preventing friction damage and breakage of the VLF transmitting antenna.

[0005] To achieve the above objectives, the present invention provides a take-up and take-down device for a very low frequency transmitting antenna, the take-up and take-down device comprising a frame, a cable assembly, and a reel assembly; The frame has a U-shaped structure; The cable assembly includes a drive unit and a connecting block. The drive unit is located on the frame and is used to drive the connecting block to reciprocate between two side plates of the frame in a first direction. The drum assembly includes a first motor, a drum, a swing arm, and a fixed pulley. The first motor is located on one side plate of the frame. The drum extends axially along a first direction, and both ends of the drum are rotatably arranged on the two side plates of the frame. The first motor is drivenly connected to the drum. The swing arm is rotatably arranged on the connecting block, and the rotation axis of the swing arm is arranged along the first direction. The fixed pulley is rotatably inserted into the swing arm. The rotation axis of the fixed pulley is perpendicular to the first direction, and the rotation axis of the swing arm is coplanar with the central cross-section of the fixed pulley. The outer peripheral wall of the fixed pulley has a groove for accommodating a very low frequency (VLF) transmitting antenna, so that the VLF transmitting antenna passes through the groove and is wound onto the drum.

[0006] Optionally, the connecting block is provided with a first ear plate at both ends, and the swing arm is provided with a rotating cylinder at both ends. The axial direction of each rotating cylinder is arranged along a first direction, and each rotating cylinder is rotatably inserted into the corresponding first ear plate. The axial direction of each rotating cylinder is coaxial with the tangential direction of the wire groove, so that the very low frequency transmitting antenna passes through one of the rotating cylinders and is then introduced into the wire groove along the tangential direction of the wire groove.

[0007] Optionally, the swing arm is provided with two support arms, the swing arm is located between the two support arms, a rotating shaft is inserted into the two support arms, and the fixed pulley is rotatably sleeved on the rotating shaft.

[0008] Optionally, the swing arm is provided with a limiting strip, the limiting strip is arranged at intervals with the fixed pulley, and the limiting strip is directly opposite the wire groove. The fixed pulley is located between one of the rotating drums and the limiting strip, and the limiting strip is used to limit the position of the very low frequency transmitting antenna.

[0009] Optionally, the drive unit includes a second motor, a lead screw, a slide rail, and a lead screw nut. The second motor is located on one side plate of the frame and is connected to the lead screw via a transmission. The lead screw and the slide rail extend along a first direction and are arranged parallel to each other on both side plates of the frame. The lead screw nut is threadedly engaged with the lead screw and is fixedly connected to the connecting block. The connecting block is slidably engaged with the slide rail.

[0010] Optionally, the connecting block is provided with a second ear plate at each end, and the two second ear plates are connected by an arc plate. One end of the lead screw nut is fixed on one of the second ear plates, and the other end of the lead screw nut is inserted into the space formed between the arc plate and the connecting block.

[0011] Optionally, the frame includes a first insulating layer, a metal layer, and a second insulating layer arranged sequentially together, wherein the first insulating layer and the second insulating layer cover both sides of the metal layer.

[0012] Optionally, the first insulating layer and the second insulating layer are made of glass fiber material, and the metal layer is made of aluminum alloy material.

[0013] Optionally, the two side plates of the frame are supported by a plurality of spaced support rods, each of which is arranged along a first direction.

[0014] Optionally, the fixed pulley includes an inner ring and an outer ring arranged coaxially, the outer peripheral wall of the inner ring and the inner peripheral wall of the outer ring are connected, the groove is located on the outer peripheral wall of the outer ring, the inner ring is made of aluminum alloy, and the outer ring is made of stainless steel.

[0015] The aforementioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0016] In summary, the beneficial effects of the above-described technical solutions conceived by this invention compared with the prior art include: The present invention provides a very low frequency (VLF) transmitting antenna deployment and retrieval device, wherein a frame is mounted on an aircraft (e.g., in a standard aircraft pod), and the VLF transmitting antenna is led out from the outside of the frame through a groove in a positioning wheel onto a drum. When high-speed retrieval of an overloaded VLF transmitting antenna is required, a first motor drives the drum to rotate forward, and the VLF transmitting antenna is quickly wound onto the drum. The fixed pulley rotates synchronously with the retrieval of the VLF transmitting antenna, thereby preventing the antenna from breaking due to excessive load and sliding friction with the groove. Simultaneously, the drive unit drives the connecting block to reciprocate left and right, which in turn drives the swing arm and the fixed pulley to reciprocate left and right, ensuring that the VLF transmitting antenna is wound regularly and orderly along the drum's axial direction. This avoids the problem of the VLF transmitting antenna accumulating in a localized area of ​​the drum after high-speed retrieval, resulting in an excessively large overall size, and the inability to quickly release misaligned VLF antenna layers after accumulation. In addition, as the number of VLF transmitting antenna layers on the drum increases, the VLF transmitting antenna will be driven to rotate adaptively around the rotation axis of the fixed pulley and the swing arm (arranged along the first direction). This ensures that the VLF transmitting antenna retracted onto the drum is always tangent to the groove of the fixed pulley, avoiding the problem of the VLF transmitting antenna being worn out and broken after it detaches from the groove due to an angle between the VLF transmitting antenna and the groove.

[0017] Similarly, when it is necessary to release the overloaded VLF transmitting antenna at high speed, the first motor drives the drum to rotate in the opposite direction. At the same time, the drive unit drives the connecting block to move back and forth. During the release process, the VLF transmitting antenna released from the drum is always tangent to the groove of the fixed pulley.

[0018] In other words, the retraction and deployment device for very low frequency (VLF) transmitting antennas provided in this embodiment of the invention is not only simple in structure and occupies little space after the VLF transmitting antenna is retracted, but also ensures that the fixed pulley rotates synchronously with the VLF transmitting antenna during high-speed retraction and deployment of the VLF transmitting antenna, and that the VLF transmitting antenna is always tangent to the wire slot during high-speed retraction and deployment, thus avoiding the problem of friction damage and breakage of the VLF transmitting antenna. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a receiving and transmitting device for a very low frequency transmitting antenna provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the frame structure provided in an embodiment of the present invention; Figure 3 This is a partial structural schematic diagram of a receiving and transmitting device for a very low frequency transmitting antenna provided in an embodiment of the present invention; Figure 4 This is an assembly diagram of the swing arm and fixed pulley provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the swing arm's swing provided in an embodiment of the present invention; Figure 6 yes Figure 4 Side view; Figure 7 This is a schematic diagram of the structure of the driving unit provided in an embodiment of the present invention.

[0020] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1. Frame; 11. Support rod; 2. Drive unit; 21. Second motor; 22. Lead screw; 23. Slide rail; 24. Lead screw nut; 3. Connecting block; 31. First ear plate; 32. Second ear plate; 33. Arc plate; 34. Slider; 4. First motor; 5. Drum; 6. Swing arm; 61. Rotary drum; 62. Support arm; 63. Rotating shaft; 64. Limiting strip; 7. Fixed pulley; 71. Wire groove; 72. Inner ring; 73. Outer ring; 100. Very low frequency transmitting antenna. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] Example: Figure 1 This is a schematic diagram of a receiving and transmitting device for a very low frequency (VLF) transmitting antenna provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the take-up and take-down device includes a frame 1, a cable assembly, and a reel assembly.

[0027] Figure 2This is a schematic diagram of the rack structure provided in an embodiment of the present invention, as shown below. Figure 2 As shown, frame 1 has a U-shaped structure.

[0028] The cable assembly includes a drive unit 2 and a connecting block 3. The drive unit 2 is located on the frame 1 and is used to drive the connecting block 3 to reciprocate between the two side plates of the frame 1 in a first direction (X-axis direction).

[0029] Figure 3 This is a partial structural schematic diagram of a receiving and transmitting device for a very low frequency transmitting antenna provided in an embodiment of the present invention. Figure 4 This is an assembly diagram of the swing arm and fixed pulley provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of the swing arm's swing provided in an embodiment of the present invention, combined with... Figures 3-5 As shown, the drum assembly includes a first motor 4, a drum 5, a swing arm 6, and a fixed pulley 7. The first motor 4 is located on one side plate of the frame 1. The drum 5 extends axially along a first direction, and both ends of the drum 5 are rotatably arranged on the two side plates of the frame 1. The first motor 4 is connected to the drum 5 in a transmission manner. The swing arm 6 is rotatably arranged on the connecting block 3, and the rotation axis of the swing arm 6 is arranged along the first direction. The fixed pulley 7 is rotatably inserted into the swing arm 6. The rotation axis of the fixed pulley 7 is perpendicular to the first direction, and the rotation axis of the swing arm 6 is coplanar with the central cross-section of the fixed pulley 7. The outer peripheral wall of the fixed pulley 7 has a wire groove 71 for accommodating a very low frequency (VLF) transmitting antenna 100, so that the VLF transmitting antenna 100 is wound onto the drum 5 after passing through the wire groove 71.

[0030] In the very low frequency (VLF) transmitting antenna deployment and retrieval device provided in this embodiment of the invention, a frame 1 is mounted on an aircraft (e.g., in a standard aircraft pod), and the VLF transmitting antenna 100 is led out from the outside of the frame 1 through the cable groove 71 of the positioning wheel onto the drum 5. When it is necessary to quickly retrieve the overloaded VLF transmitting antenna 100, the first motor 4 drives the drum 5 to rotate forward, and the VLF transmitting antenna 100 is quickly wound onto the drum 5. The fixed pulley 7 rotates synchronously with the retrieval of the VLF transmitting antenna 100, thereby preventing the VLF transmitting antenna 100 from being pulled apart due to excessive load and sliding friction with the cable groove 71. Meanwhile, the drive unit 2 drives the connecting block 3 to reciprocate left and right. The connecting block 3, in turn, drives the swing arm 6 and the fixed pulley 7 to reciprocate left and right, so that the very low frequency (VLF) transmitting antenna 100 is wound regularly and orderly around the drum 5 along the axial direction. This avoids the problem of the VLF transmitting antenna 100 accumulating in a localized area of ​​the drum 5 after high-speed retrieval, resulting in an excessively large overall size, and the problem of the VLF transmitting antenna 100 being mis-layered and unable to be released quickly after accumulation. In addition, as the number of VLF transmitting antenna layers on the drum 5 increases, the VLF transmitting antenna 100 will cause the fixed pulley 7 and the swing arm 6 to adaptively rotate around the rotation axis of the swing arm 6 (arranged along the first direction) (i.e., rotating around the axial direction of the rotating drums 61 at both ends of the swing arm 6). Figure 5 The VLF transmitting antenna 100 swings in direction A in the drum 5 so that it is always tangent to the groove 71 of the fixed pulley 7. This avoids the problem that the VLF transmitting antenna 100 will be worn out and broken after it leaves the groove 71 due to the angle between the VLF transmitting antenna 100 and the groove 71.

[0031] Similarly, when it is necessary to release the overloaded very low frequency transmitting antenna 100 at high speed, the first motor 4 drives the drum 5 to rotate in the opposite direction. At the same time, the drive unit 2 drives the connecting block 3 to move back and forth. During the release process, the very low frequency transmitting antenna 100 released from the drum 5 is always tangent to the groove 71 of the fixed pulley 7.

[0032] In other words, the retraction and deployment device for a very low frequency (VLF) transmitting antenna provided in this embodiment of the invention is not only simple in structure, but also occupies little space after the VLF transmitting antenna 100 is retracted. Moreover, when the VLF transmitting antenna 100 is retracted and deployed at high speed under high load, the fixed pulley 7 rotates synchronously with the VLF transmitting antenna 100 during retraction and deployment, and the VLF transmitting antenna 100 is always tangent to the wire groove 71 during high-speed retraction and deployment, thus avoiding the problem of friction damage and breakage of the VLF transmitting antenna 100.

[0033] In this embodiment, baffles are fitted at both ends of the drum 5, which can limit the very low frequency transmitting antenna 100. The drum 5 has a cable capacity of not less than 2300m, an antenna release length of 2200m, a maximum load of 500kg, and a release speed of not less than 8m / s. The two ends of the drum 5 are rotatably arranged on the side plates of the frame 1 via connecting sleeves made of high-strength titanium alloy.

[0034] In addition, the first motor 4 is a permanent magnet synchronous servo motor, realizing closed-loop control of position, speed, and torque. Its rated speed is designed to be 9000 rpm, with a maximum speed of 15000 rpm. The torque of the first motor 4 is 37 Nm. The first motor 4 is liquid-cooled, with a cooling water flow rate of approximately 16 L / min. The first motor 4 measures Φ0.17 × 0.15 m and weighs 15 kg. A reducer is installed between the first motor 4 and the drum 5, with a reduction ratio of 21.25. The first motor 4 also contains a brake, a friction brake with a braking torque greater than 56 Nm, measuring Φ0.275 × 0.1 mm and weighing 8 kg. This brake is used for static stopping of the drum 5 after it stops, and can also be used for dynamic braking in emergency situations.

[0035] To ensure the reliability of the release and recovery of the very low frequency transmitting antenna 100, a large-pitch cross-laying method is adopted, so that the very low frequency transmitting antenna 100 is wound back and forth on the drum 5 with the cable assembly at a pitch of 4 times the antenna diameter.

[0036] For example, the fixed pulley 7 includes an inner ring 72 and an outer ring 73 arranged coaxially. The outer peripheral wall of the inner ring 72 is connected to the inner peripheral wall of the outer ring 73. The groove 71 is located on the outer peripheral wall of the outer ring 73. The inner ring 72 is made of aluminum alloy, and the outer ring 73 is made of stainless steel. The outer ring 73, which is in contact with the very low frequency transmitting antenna 100, is made of stainless steel to ensure its wear resistance, while the inner ring 72, made of aluminum alloy, ensures its strength.

[0037] See also Figure 3 and Figure 4 The connecting block 3 has a first ear plate 31 at each end. The swing arm 6 has a rotating cylinder 61 at each end. The axis of each rotating cylinder 61 is arranged along the first direction. Each rotating cylinder 61 is rotatably inserted into the corresponding first ear plate 31. The axis of each rotating cylinder 61 is coaxial with the tangential direction of the wire groove 71, so that the very low frequency transmitting antenna 100 passes through a rotating cylinder 61 and is introduced into the wire groove 71 along the tangential direction of the wire groove 71.

[0038] In the above embodiment, on the one hand, the swing arm 6 can reliably rotate on the connecting block 3 through two rotating cylinders 61; on the other hand, the rotating cylinder 61 can also serve as a channel for the very low frequency transmitting antenna 100 to be introduced, so that the very low frequency transmitting antenna 100 passes through one rotating cylinder 61 ( Figure 4 The right-side rotating cylinder 61 is then guided into the wire groove 71 along the tangential direction of the wire groove 71 to avoid the very low frequency transmitting antenna 100 being worn and broken due to being guided at other angles.

[0039] For example, both first ear plates 31 are fixed to the bottom surface of the connecting block 3.

[0040] Figure 6 yes Figure 4 The side view, combined with Figure 4 and Figure 6 As shown, the swing arm 6 is provided with two support arms 62, and the swing arm 6 is located between the two support arms 62. A rotating shaft 63 is inserted into the two support arms 62, and a fixed pulley 7 is rotatably sleeved on the rotating shaft 63. The two support arms 62 provide support for the rotating shaft 63, while the rotating shaft 63 provides support for the rotation of the fixed pulley 7.

[0041] For example, the swing arm 6 and the two support arms 62 are integrally formed, and the two support arms 62 are arranged in a V-shape. Each support arm 62 has a V-shaped structure, which has the effect of reducing weight.

[0042] In addition, a limit bar 64 is provided on the swing arm 6. The limit bar 64 is arranged at intervals with the fixed pulley 7, and the limit bar 64 is directly opposite the wire groove 71. The fixed pulley 7 is located between a rotating drum 61 and the limit bar 64. The limit bar 64 is used to limit the very low frequency transmitting antenna 100.

[0043] It is easy to understand that the limiting strip 64 can prevent the very low frequency transmitting antenna 100 from detaching from the wire slot 71 due to slack when the very low frequency transmitting antenna 100 is under overload or without overload.

[0044] Figure 7 This is a schematic diagram of the structure of the driving unit provided in an embodiment of the present invention, as shown below. Figure 7 As shown, the drive unit 2 includes a second motor 21, a lead screw 22, a slide rail 23, and a lead screw nut 24. The second motor 21 is located on one side plate of the frame 1. The second motor 21 is connected to the lead screw 22 for transmission. The lead screw 22 and the slide rail 23 extend along the first direction and are arranged parallel to each other on both side plates of the frame 1. The lead screw nut 24 is threadedly engaged with the lead screw 22 and is fixedly connected to the connecting block 3. The connecting block 3 is slidably engaged with the slide rail 23.

[0045] In the above embodiment, the second motor 21 drives the lead screw 22 to rotate. Under the guidance of the slide rail 23, the rotation of the lead screw 22 is converted into the axial movement of the lead screw nut 24 and the connecting block 3. The forward and reverse rotation of the second motor 21 can realize the repeated movement of the connecting block 3, the swing arm 6 and the fixed pulley 7, avoiding the problem of the very low frequency transmitting antenna 100 gathering in a localized area of ​​the drum 5 after high-speed recovery.

[0046] For example, the second motor 21 is a servo motor, realizing closed-loop control of position, speed, and torque. Its rated speed is designed to be 3000 rpm, with a maximum speed of 4500 rpm and a motor torque of 4 Nm. It uses a standard housing with a 100mm mounting flange and weighs 4 kg. A reducer is installed between the second motor 21 and the lead screw 22. The reducer has a reduction ratio of 8 and uses planetary gears and helical gears for space saving. The second motor 21 and the reducer are integrally mounted on one side plate of the frame 1, using a standard housing with a 100mm mounting flange and weighing 6 kg. The lead screw 22 is a Φ25mm diameter steel lead screw with a lead of 15mm, a total length of 1565mm, an effective stroke of 1432mm, and can withstand an axial alternating load of 500kg. It weighs 6.7kg. The slide rail 23 uses two 23×22mm steel guide rails. The connecting block 3 is equipped with four sliders 34. The sliders 34 slide in conjunction with the slide rail 23. The sliders 34 can withstand a radial alternating load of 500kg and weigh 14.2kg.

[0047] It should be noted that in other embodiments of the present invention, the drive unit 2 may also be a telescopic motor, a cylinder or other linear displacement mechanism, and the present invention does not limit this.

[0048] Furthermore, each end of the connecting block 3 is provided with a second ear plate 32 (each second ear plate 32 is perpendicular to the first direction). The two second ear plates 32 are connected by an arc-shaped plate 33. One end of the lead screw nut 24 is fixed to one of the second ear plates 32, and the other end of the lead screw nut 24 is inserted into the space formed between the arc-shaped plate 33 and the connecting block 3. The two second ear plates 32 support the arc-shaped plate 33 and serve as a transitional connection between the lead screw nut 24 and the connecting block 3. The arc-shaped plate 33 increases the structural strength of the second ear plates 32. Additionally, the space formed between the arc-shaped plate 33 and the connecting block 3 allows for the placement and insertion of the lead screw nut 24, further reducing space requirements and achieving miniaturization.

[0049] In this embodiment, the frame 1 includes a first insulating layer, a metal layer and a second insulating layer arranged in sequence, with the first insulating layer and the second insulating layer covering both sides of the metal layer.

[0050] It is easy to understand that during the deployment and retraction of the VLF transmitting antenna 100, a high-frequency AC voltage of 12kV exists on the VLF transmitting antenna 100, which can be easily transmitted to the carrier platform. The two insulating layers can achieve insulation between the frame 1 and the carrier platform, while the metal layer can enhance the structural strength of the frame 1.

[0051] For example, the first and second insulating layers can be made of fiberglass, and the metal layer can be made of aluminum alloy. Additionally, the frame 1 can withstand 12kV AC voltage without discharging, can handle a maximum fluctuating load of 500kg without deformation, and weighs no more than 35kg.

[0052] In one implementation of the present invention, the two side plates of the frame 1 are supported by a plurality of spaced support rods 11, each support rod 11 being arranged along a first direction.

[0053] In the above embodiments, the support rod 11 can support the two side plates of the frame 1, ensuring the structural strength of the frame 1.

[0054] For example, the support rod 11 is provided with a plurality of spaced-apart weight-reducing holes along its axial direction to achieve weight reduction. In addition, the support rod 11 and the slide rail 23 are fixedly connected, so that the support rod 11 can simultaneously support the slide rail 23.

[0055] It should be noted that the standard aircraft pod has external dimensions of 5×0.5×0.5m, while the overall dimensions of this recovery device are 1.46×0.42×0.42m, achieving miniaturization and allowing it to be stored inside a standard aircraft pod.

[0056] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A receiving and transmitting device for a very low frequency (VLF) transmitting antenna, characterized in that, The take-up and unwinding device includes a frame, a cable assembly, and a reel assembly; The frame has a U-shaped structure; The cable assembly includes a drive unit and a connecting block. The drive unit is located on the frame and is used to drive the connecting block to reciprocate between two side plates of the frame in a first direction. The drum assembly includes a first motor, a drum, a swing arm, and a fixed pulley. The first motor is located on one side plate of the frame. The drum extends axially along a first direction, and both ends of the drum are rotatably arranged on the two side plates of the frame. The first motor is drivenly connected to the drum. The swing arm is rotatably arranged on the connecting block, and the rotation axis of the swing arm is arranged along the first direction. The fixed pulley is rotatably inserted into the swing arm. The rotation axis of the fixed pulley is perpendicular to the first direction, and the rotation axis of the swing arm is coplanar with the central cross-section of the fixed pulley. The outer peripheral wall of the fixed pulley has a groove for accommodating a very low frequency (VLF) transmitting antenna, so that the VLF transmitting antenna passes through the groove and is wound onto the drum.

2. The receiving and transmitting device for a very low frequency transmitting antenna according to claim 1, characterized in that, The connecting block has a first ear plate at each end, and the swing arm has a rotating cylinder at each end. The axial direction of each rotating cylinder is arranged along a first direction. Each rotating cylinder is rotatably inserted into the corresponding first ear plate, and the axial direction of each rotating cylinder is coaxial with the tangential direction of the wire groove, so that the very low frequency transmitting antenna passes through one of the rotating cylinders and is introduced into the wire groove along the tangential direction of the wire groove.

3. The receiving and transmitting device for a very low frequency transmitting antenna according to claim 2, characterized in that, The swing arm is provided with two support arms, the swing arm is located between the two support arms, and a rotating shaft is inserted into the two support arms. The fixed pulley is rotatably sleeved on the rotating shaft.

4. The receiving and transmitting device for a very low frequency transmitting antenna according to claim 2, characterized in that, The swing arm is provided with a limit bar, which is arranged at intervals with the fixed pulley and is directly opposite the groove. The fixed pulley is located between the rotating drum and the limit bar. The limit bar is used to limit the position of the very low frequency transmitting antenna.

5. The receiving and transmitting device for a very low frequency transmitting antenna according to claim 1, characterized in that, The drive unit includes a second motor, a lead screw, a slide rail, and a lead screw nut. The second motor is located on one side plate of the frame and is connected to the lead screw via a transmission. The lead screw and the slide rail extend along a first direction and are arranged parallel to each other on both side plates of the frame. The lead screw nut is threadedly engaged with the lead screw and is fixedly connected to the connecting block. The connecting block is slidably engaged with the slide rail.

6. The take-up and take-off device for a very low frequency transmitting antenna according to claim 5, characterized in that, The connecting block has a second ear plate at each end, and the two second ear plates are connected by an arc plate. One end of the lead screw nut is fixed to one of the second ear plates, and the other end of the lead screw nut is inserted into the space formed between the arc plate and the connecting block.

7. The receiving and transmitting device for a very low frequency transmitting antenna according to claim 1, characterized in that, The frame includes a first insulating layer, a metal layer, and a second insulating layer arranged sequentially together, with the first insulating layer and the second insulating layer covering both sides of the metal layer.

8. A receiving and transmitting device for a very low frequency transmitting antenna according to claim 7, characterized in that, The first and second insulating layers are made of glass fiber, and the metal layer is made of aluminum alloy.

9. A receiving and transmitting device for a very low frequency transmitting antenna according to any one of claims 1-8, characterized in that, The frame is supported between its two side plates by a plurality of spaced support rods, each of which is arranged along a first direction.

10. A receiving and transmitting device for a very low frequency transmitting antenna according to any one of claims 1-8, characterized in that, The fixed pulley includes an inner ring and an outer ring arranged coaxially. The outer peripheral wall of the inner ring is connected to the inner peripheral wall of the outer ring. The groove is located on the outer peripheral wall of the outer ring. The inner ring is made of aluminum alloy and the outer ring is made of stainless steel.

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