A low-altitude target detection radar

Abstract

This invention provides a low-altitude target detection radar, belonging to the field of detection radar technology. It includes a telescopic joint one, a telescopic joint two movably embedded at the top center of the telescopic joint one, and a telescopic joint three movably embedded at the top center of the telescopic joint two. A detection radar is mounted on the top of the telescopic joint three. A lower T-shaped retaining post is provided on the outer wall of the telescopic joint one, and a storage groove is opened on one outer wall of the telescopic joint two. Four guide posts are symmetrically arranged on the inner wall of the storage groove. This invention provides additional support for the telescopic joint two through a retaining plate, thereby reinforcing the telescopic joints of the first and second telescopic joints, increasing the contact area between them, ensuring the limiting strength between the two telescopic joints and the verticality of the second telescopic joint, improving the overall structural strength, and thus avoiding bending problems under strong winds and other severe weather conditions.

Description

Technical Field

[0001] This invention belongs to the field of detection radar technology, specifically relating to a low-altitude target detection radar. Background Technology

[0002] Low-altitude target detection radar is a radar system specifically designed to detect, track, and identify low-altitude and ultra-low-altitude flying targets (such as drones, cruise missiles, and light aircraft). It aims to solve the problem of low-altitude detection blind spots caused by the curvature of the earth, terrain obstruction, and strong ground clutter interference of traditional radars. With the increasing prominence of the threat posed by "low, slow, and small" targets, this type of radar plays a key role in military air defense, security for major events, urban security, and low-altitude economic management.

[0003] To increase their mobility, some low-altitude target detection radars are vehicle-mounted. When detecting low-altitude targets, a lifting mechanism is used to elevate the radar to a higher position to overcome the curvature of the earth and terrain obstruction. Currently, the lifting mechanism used for low-altitude target detection radars adopts a multi-section telescopic rod structure. The extension of the multi-section telescopic rod is used to lift the low-altitude target detection radar. However, in order to increase the extension length, the contact area between each telescopic rod becomes smaller and smaller, which weakens the limiting strength between adjacent telescopic rods and reduces the support strength. This makes them more prone to bending in strong winds and other severe weather. Moreover, when the low-altitude target detection radar is located at a high position and encounters strong convective weather, the multi-section telescopic rod and the low-altitude target detection radar will encounter greater wind resistance, and under the action of external forces, they are prone to bending and deformation, affecting the subsequent retraction operation.

[0004] Therefore, a low-altitude target detection radar is proposed. Summary of the Invention

[0005] This invention provides a low-altitude target detection radar, the purpose of which is to solve the problems mentioned above.

[0006] This invention provides a low-altitude target detection radar, including a telescopic joint one, a telescopic joint two movably embedded at the top center of the telescopic joint one, a telescopic joint three movably embedded at the top center of the telescopic joint two, and a detection radar mounted on the top of the telescopic joint three. A lower T-shaped retaining post is provided on the outer wall of the telescopic joint one, and a storage groove is formed on one side of the outer wall of the telescopic joint two. Four guide posts are symmetrically arranged on the inner wall of the storage groove, and an inner through groove is formed on the inner wall of the storage groove near the four guide posts. A movable plate is movably fitted on the four guide posts, and a spring is provided between the movable plate and the storage groove, near the outer side of the guide posts. The bottom has an inclined surface, and the outer wall of the moving plate away from the second telescopic joint has an alignment concave surface. The inner wall of the alignment concave surface has an outer through groove, and a rotating disk is rotatably connected to the inner wall of the alignment concave surface near the outer side of the outer through groove. The outer circumferential surface of the rotating disk has several gear teeth 1 evenly spaced in the circumferential direction, and a locking plate is provided on the outer circumferential surface of the rotating disk near the gear teeth 1. One end of the locking plate has a bending plate. The inner wall of the alignment concave surface near the outer side of the outer through groove and above the rotating disk has an upper T-shaped locking post. The outer wall of the third telescopic joint has a lifting block, and one outer wall of the lifting block has several gear teeth 2 evenly spaced in the axial direction.

[0007] Furthermore, a side groove is formed on the outer wall of the telescopic joint two adjacent to the storage groove. A servo motor one is arranged on the lower part of the inner wall of the side groove. The servo motor one is fixedly connected to a bidirectional trapezoidal lead screw through its output end. Two screw nut seats arranged in a mirror shape on the bidirectional trapezoidal lead screw are fixedly connected to the driving block by screws. A light rod is arranged on the upper part of the inner wall of the side groove. Two driven blocks are movably sleeved on the outer wall of the light rod. A rotating plate one and a rotating plate two are respectively arranged between the two driving blocks and the two driven blocks. The rotating plate one and the rotating plate two are hinged together.

[0008] Furthermore, the bottom of the first telescopic joint is provided with a mounting plate in a circular trajectory, the bottom of the mounting plate is provided with a ring sleeve, the bottom of the ring sleeve is provided with a base, and a second servo motor is provided at the center of the bottom of the mounting plate, the output end of the second servo motor is fixedly connected to the center of the bottom of the first telescopic joint.

[0009] Furthermore, the inner through groove and the outer through groove overlap, and the lifting block moves up and down inside the inner through groove and the outer through groove; By adopting the above technical solution, the overlapping inner and outer through grooves provide space for the lifting block to move up and down. Thus, when the lifting block moves up and down, the gear teeth on the lifting block move up and down synchronously, thereby providing power for the rotation of the rotating disk and controlling the reciprocating rotation of the rotating disk.

[0010] Furthermore, after a portion of the movable plate protrudes from the receiving groove, the alignment concave surface and the outer side wall of the telescopic joint are on the same vertical plane, and an active groove is provided on the outer side wall of the movable plate near the lower side of the alignment concave surface, allowing the locking plate to move circumferentially. By adopting the above technical solution, and utilizing the aligned concave surfaces and expansion joint one on the same vertical plane, the locking plate can be positioned outside the expansion joint one during circumferential movement, preventing obstruction of the locking plate's movement. Furthermore, the movable groove allows the locking plate to engage with the lower T-shaped locking post on the expansion joint one during circumferential movement, again preventing obstruction. The locking plate reinforces the expansion joints of expansion joint one and two, increasing their contact area and ensuring the limiting strength between them, thereby improving the overall structural strength and preventing bending problems under severe weather conditions such as strong winds.

[0011] Furthermore, the first, second, and third expansion joints are all square tube structures, and the third expansion joint may be provided with the same structure as the second expansion joint. The second and third expansion joints are both raised and lowered by an electric drive structure. By adopting the above technical solution, telescopic joints one, two, and three, with their square tube structure, can be interlocked to perform telescopic operations, thereby raising the detection radar to a higher position. This facilitates the vehicle-mounted detection radar's ascent and descent to higher locations in the field, enabling high-precision detection of low-altitude targets, improving the radar's coverage and accuracy. Telescopic joints two and three, which have the same structure, can be combined to form a multi-section telescopic joint structure, further raising the detection radar to even higher positions and increasing the detection range for low-altitude targets. Furthermore, the telescopic joints two and three can be telescopically extended and retracted using an electrically driven structure (such as an electric telescopic rod), achieving high electrification and enabling rapid deployment and elevation of the detection radar.

[0012] Furthermore, the locking plate and the bending plate engage with the lower T-shaped locking post, and the bending plate is located inside the lower T-shaped locking post; By adopting the above technical solution, the interlocking structure creates a limiting relationship between the interlocking plate and the bending plate and the lower T-shaped locking post. After the expansion joint 2 is subjected to bending deformation force, the interlocking plate and the bending plate provide additional support for the expansion joint 2, ensuring the verticality of the expansion joint 2.

[0013] Furthermore, the length of the second tooth is much greater than the length of the first tooth, and the second tooth and the first tooth are always in a meshing connection state; By adopting the above technical solution, and utilizing the longer second gear tooth, the first gear tooth on the moving plate and the second gear tooth on the lifting block can be kept in meshing state when the moving plate moves horizontally, thereby realizing power transmission.

[0014] Furthermore, the locking plate and the bending plate can be stored inside the aligned concave surface after circumferential movement as the rotating disk rotates; By adopting the above technical solution, the snap-fit ​​plate and the bending plate can be stored, so that when the second expansion joint is stored inside the first expansion joint, the presence of the snap-fit ​​plate and the bending plate will not hinder the contraction of the second expansion joint.

[0015] Furthermore, both rotating plate one and rotating plate two have rounded chamfers on their opposite outer walls; By adopting the above technical solution and using the chamfered corner, the gap at the hinge of rotating plate one and rotating plate two can be minimized. After rotating plate one and rotating plate two form a certain angle, they can break through the strong convective weather, reduce the contact area between expansion joint two and strong wind, reduce wind resistance, thereby reducing the pressure on expansion joint two, preventing expansion joint two from bending and deforming due to strong convective weather, and ensuring the smooth expansion and contraction of expansion joint two.

[0016] The beneficial effects of this invention are as follows: 1. In this invention, when the telescopic joint three extends upward, it uses meshing transmission to pull the rotating disk on the telescopic joint two to rotate, so that the locking plate and the bending plate are locked and limited on the lower T-shaped locking post. The locking plate provides additional support for the telescopic joint two, thereby reinforcing the telescopic joints one and two, increasing the contact area between the telescopic joints one and two, ensuring the limiting strength between the telescopic joints one and two and the verticality of the telescopic joint two, improving the overall structural strength, and thus avoiding bending problems in strong winds and other severe weather conditions. It also ensures the smoothness of the telescopic joint two's extension and retraction, and avoids the problem of large extension and retraction resistance caused by the telescopic joint two being tilted, resulting in poor extension and retraction or even failure to extend and retract. 2. In this invention, rotating plate one and rotating plate two are set at a certain angle on the outside of expansion joint two. The conical surface is used to break the wind and guide the airflow, thereby reducing the contact area between expansion joint two and strong wind, reducing wind resistance and reducing the pressure on expansion joint two, avoiding bending deformation of expansion joint two due to strong convective weather, and ensuring smooth expansion and contraction of expansion joint two.

[0017] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the expansion joint II structure according to an embodiment of the present invention; Figure 3 This is a three-dimensional schematic diagram of the expansion joint in two sections according to an embodiment of the present invention; Figure 4 This is an embodiment of the present invention. Figure 1 Enlarged diagram of point A in the diagram; Figure 5 This is a schematic diagram of the three-structure expansion joint according to an embodiment of the present invention; Figure 6 This is a three-dimensional cross-sectional view of the expansion joint according to an embodiment of the present invention; Figure 7 This is an embodiment of the present invention. Figure 2 Enlarged diagram of point B in the diagram; Reference numerals: 1. Telescopic joint one; 11. Lower T-shaped locking post; 2. Telescopic joint two; 21. Storage slot; 211. Guide post; 212. Inner through slot; 22. Moving plate; 221. Inclined surface; 222. Alignment concave surface; 223. Outer through slot; 224. Rotating disk; 2241. Gear tooth one; 2242. Locking plate; 2243. Bending plate; 23. Spring; 225. Upper T-shaped locking post; 25. Side groove; 251. Servo motor one; 2511. Bidirectional trapezoidal lead screw; 2512. Driving block; 252. Smooth rod; 2521. Driven block; 26. Rotating plate one; 27. Rotating plate two; 3. Telescopic joint three; 31. Lifting block; 311. Gear tooth two; 4. Detection radar; 5. Base; 51. Ring sleeve; 52. Mounting plate; 53. Servo motor two. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] Example 1 Reference Figure 1-6This invention proposes a low-altitude target detection radar, including a telescopic joint 1. A second telescopic joint 2 is movably embedded at the top center of the first telescopic joint 1, and a third telescopic joint 3 is movably embedded at the top center of the second telescopic joint 2. All three telescopic joints (1, 2, and 3) are square tubular structures, allowing them to interlock and extend to raise the detection radar 4 to a higher position. This facilitates the vehicle-mounted detection radar 4's elevation and retraction in the field, enabling high-precision detection of low-altitude targets and improving the radar's coverage. To improve the detection range and accuracy, the telescopic joint 3 can be equipped with the same structure as the telescopic joint 2. Both the telescopic joint 2 and the telescopic joint 3 are raised and lowered by an electric drive structure. The telescopic joint 3 and the telescopic joint 2, which have the same structure, can be combined to form a multi-section telescopic joint structure, thereby raising the detection radar 4 to a higher position and further improving the detection range of low-altitude targets. The telescopic joint 2 and the telescopic joint 3 can be extended and retracted by an electric drive structure (such as an electric telescopic rod). The high degree of electrification enables the rapid deployment and raising and lowering of the detection radar 4. The detection radar 4 is installed at the top of the telescopic joint 3. A lower T-shaped locking post 11 is provided on the outer wall of the telescopic joint 1. A storage groove 21 is provided on one side of the outer wall of the telescopic joint 2. Four guide posts 211 are symmetrically arranged on the inner wall of the storage groove 21. An inner through groove 212 is provided on the inner wall of the storage groove 21 near the four guide posts 211. A movable plate 22 is movably sleeved on the four guide posts 211. A limit block is provided on the outer wall of the movable plate 22. With the cooperation of the limit block and the storage groove 21, the movable plate 22 can only move outward a limited distance, so that the alignment concave surface 222 and the outer wall of the telescopic joint 1 are on the same vertical plane. A spring 23 is provided between the movable plate 22 and the storage groove 21 and near the outer side of the guide posts 211. A bottom opening of the movable plate 22 is provided. An alignment concave surface 222 is formed on the outer wall of the movable plate 22 away from the telescopic joint 2. An outer through groove 223 is formed on the inner wall of the alignment concave surface 222. A rotating disk 224 is rotatably connected to the inner wall of the alignment concave surface 222 near the outer side of the outer through groove 223. A number of gear teeth 2241 are evenly spaced circumferentially on the outer circumferential surface of the rotating disk 224. A locking plate 2242 is provided on the outer circumferential surface of the rotating disk 224 near the gear teeth 2241. After a part of the movable plate 22 pushes out of the receiving groove 21, the alignment concave surface 222 and the outer wall of the telescopic joint 1 are on the same vertical plane. A locking plate 224 is provided on the outer wall of the movable plate 22 near the lower side of the alignment concave surface 222. The movable groove for circumferential movement, utilizing the aligned concave surface 222 on the same vertical plane and the expansion joint 1, allows the locking plate 2242 to be positioned outside the expansion joint 1 during circumferential movement, preventing obstruction of the locking plate 2242's movement. The movable groove also allows the locking plate 2242 to engage with the lower T-shaped locking post 11 on the expansion joint 1 during circumferential movement, preventing obstruction of the locking plate 2242's movement. The locking plate 2242 reinforces the expansion joints of expansion joint 1 and expansion joint 2, increasing the contact area between them, ensuring the limiting strength between expansion joints 1 and 2, improving the overall structural strength, and thus preventing bending problems under strong winds and other severe weather conditions. The end is provided with a bending plate 2243. The engaging plate 2242 and the bending plate 2243 engage with the lower T-shaped locking post 11. The bending plate 2243 is located inside the lower T-shaped locking post 11. The engaging structure creates a limiting relationship between the engaging plate 2242 and the bending plate 2243 and the lower T-shaped locking post 11. After the expansion joint 2 is subjected to bending deformation force, the engaging plate 2242 and the bending plate 2243 provide additional support for the expansion joint 2, ensuring the verticality of the expansion joint 2. After the engaging plate 2242 and the bending plate 2243 move circumferentially with the rotating disk 224, they can be stored inside the aligned concave surface 222. This allows for the storage of the engaging plate 2242 and the bending plate 2243. Furthermore, when the expansion joint 2 is stored inside the expansion joint 1,The presence of the locking plate 2242 and the bending plate 2243 does not hinder the contraction of the expansion joint 2. Upper T-shaped locking posts 225 are provided on the inner wall of the aligned concave surface 222 near the outer side of the outer through groove 223 and above the rotating disk 224. A lifting block 31 is provided on the outer wall of the expansion joint 3. The inner through groove 212 and the outer through groove 223 overlap, and the lifting block 31 moves up and down within the inner through groove 212 and the outer through groove 223. The overlapping inner through groove 212 and the outer through groove 223 provide space for the lifting block 31's movement, thus allowing the lifting block 31 to move up and down during its movement. The gear teeth 311 on the lifting block 31 move synchronously up and down, thus providing power for the rotation of the rotating disk 224, and controlling the reciprocating rotation of the rotating disk 224. Several gear teeth 311 are axially spaced at equal intervals on one side of the outer wall of the lifting block 31. The length of the gear teeth 311 is much greater than the length of the gear teeth 2241, and the gear teeth 311 and 2241 are always in a meshing connection. By utilizing the longer gear teeth 311, the gear teeth 2241 on the moving plate 22 and the gear teeth 311 on the lifting block 31 are always in a meshing state when the moving plate 22 moves horizontally, thereby achieving power transmission. To enhance the structural strength between adjacent expansion joints, in this embodiment, when expansion joint 3 extends upwards, the rotating disk 224 on expansion joint 2 is rotated by meshing transmission, causing the locking plate 2242 and the bending plate 2243 to engage and limit the expansion joint on the lower T-shaped locking post 11. The locking plate 2242 provides additional support for expansion joint 2, thereby reinforcing the expansion joints of expansion joint 1 and expansion joint 2, increasing the contact area between expansion joint 1 and expansion joint 2, ensuring the limiting strength between expansion joint 1 and expansion joint 2, as well as the verticality of expansion joint 2, improving the overall structural strength, and thus preventing bending problems under strong winds and other severe weather conditions. It also ensures the smoothness of expansion and contraction of expansion joint 2, preventing expansion joint 2 from being tilted and causing resistance to expansion and contraction. Excessive force can cause problems with smooth or even impossible extension and retraction. Specifically, when lifting the detection radar 4, an electrically driven structure (such as an electric telescopic rod) is used to first control the upward movement of telescopic joint 2. Telescopic joint 2 gradually pushes out of telescopic joint 1. When most of telescopic joint 2 has pushed out of telescopic joint 1, the moving plate 22 and telescopic joint 1 are misaligned. At this time, the limiting force of the moving plate 22 disappears, and under the rebound force of the spring 23 and the linear horizontal guidance of the guide column 211, the moving plate 22 pushes outward a certain distance. At this time, the aligned concave surface 222 and the outer wall of telescopic joint 1 are on the same vertical plane. Then, the electrically driven structure (such as an electric telescopic rod) is used to control the upward movement of telescopic joint 3, realizing the extension section by section. With extension and retraction... When section 3 moves upward, the lifting block 31 on section 3 moves upward along the inner through groove 212 and the outer through groove 223. Utilizing the meshing transmission between gear teeth 2241 and 311, the rotating disk 224 rotates counterclockwise under the traction of the meshing. As the rotating disk 224 rotates, the engaging plate 2242 on the rotating disk 224 moves synchronously circumferentially. With the circumferential movement of the engaging plate 2242, the bent plate 2243 at one end of the engaging plate 2242 engages with the lower T-shaped locking post 11 on section 1. The engaging plate 2242 and the bent plate 2243 form a limiting relationship with the lower T-shaped locking post 11. After the expansion joint 2 is subjected to bending deformation force, the engaging plate 2242 and the bent plate 2243 provide additional support for the expansion joint 2, ensuring... The verticality of telescopic joint 2 is such that when telescopic joint 3 has the same structure as telescopic joint 2, several telescopic joints can be combined to raise the detection radar 4 to a higher position. When the detection radar 4 is lowered, the telescopic joint is gradually contracted from top to bottom. When telescopic joint 3 moves downward, under the traction of the meshing transmission, the rotating disk 224 rotates counterclockwise. The locking plate 2242 and the bending plate 2243 move circumferentially with the rotating disk 224 and can be stored inside the aligned concave surface 222. When telescopic joint 2 moves downward, under the guidance of the inclined surface 221 at the bottom of the moving plate 22, the moving plate 22 is pressed by telescopic joint 1 and stored in the storage groove 21 on telescopic joint 2 until telescopic joint 2 is retracted to the inside of telescopic joint 1.

[0021] Example 2 Reference Figure 1 , Figure 2 and Figure 7 Based on the above embodiments, this embodiment of the invention further proposes that a side groove 25 is provided on the outer wall of the telescopic joint 2 adjacent to the storage groove 21. A servo motor 251 is provided at a lower position on the inner wall of one side of the side groove 25. The servo motor 251 is fixedly connected to a bidirectional trapezoidal lead screw 2511 through its output end. Two screw nut seats arranged in a mirror shape on the bidirectional trapezoidal lead screw 2511 are fixedly connected to an active block 2512 by screws. A guide rod 252 is provided at a higher position on the inner wall of one side of the side groove 25. Two driven blocks 2521 are movably sleeved on the outer wall of the guide rod 252. A rotating plate 26 and a rotating plate 27 are respectively provided between the two active blocks 2512 and the two driven blocks 2521. The rotating plate 26 and the rotating plate 27 are hinged together. Both sides of the outer wall of the two-sided rotating plate 27 are provided with rounded chamfers. By using the rounded chamfers, the gap at the hinge of the rotating plate 26 and the rotating plate 27 can be minimized. After the rotating plate 26 and the rotating plate 27 form a certain angle, they can break through the strong convective weather, reduce the contact area between the expansion joint 22 and the strong wind, reduce wind resistance, thereby reducing the pressure on the expansion joint 22, and prevent the expansion joint 22 from bending and deforming due to strong convective weather, ensuring the smooth expansion and contraction of the expansion joint 22. The bottom of the expansion joint 1 is provided with a mounting plate 52 in a ring track. The bottom of the mounting plate 52 is provided with a ring sleeve 51. The bottom of the ring sleeve 51 is provided with a base 5. The center of the bottom of the mounting plate 52 is provided with a servo motor 2 53. The output end of the servo motor 2 53 is fixedly connected to the center of the bottom of the expansion joint 1. To reduce wind resistance on the expansion joint, in this embodiment, rotating plate 26 and rotating plate 27 are positioned at a certain angle on the outside of expansion joint 2, using their conical surfaces to break the wind and guide airflow. This reduces the contact area between expansion joint 2 and strong winds, thereby reducing wind resistance and the pressure on expansion joint 2, preventing bending deformation of expansion joint 2 due to severe convective weather, and ensuring smooth expansion and contraction of expansion joint 2. Specifically, when encountering severe convective weather, servo motor 253 is first controlled to drive expansion joint 1 to rotate through its output end on one side. Expansion joint 2, expansion joint 3, and detection radar 4 rotate synchronously, with rotating plate 26 and rotating plate 27 facing the wind direction. Then, servo motor 251 is controlled to drive expansion joint 1 through its output end on one side. The output end drives the bidirectional trapezoidal screw 2511 to rotate. The two active blocks 2512 on the bidirectional trapezoidal screw 2511 move towards each other. Under the action of traction force, the driven block 2521 moves linearly along the smooth rod 252. Since the opposite ends of the rotating plate 1 26 and the rotating plate 27 are hinged, as the active block 2512 and the driven block 2521 pull the other ends of the rotating plate 1 26 and the rotating plate 27 to move linearly, the opposite ends of the rotating plate 1 26 and the rotating plate 27 rotate towards each other. At this time, the rotating plate 1 26 and the rotating plate 27 have a certain included angle. The conical surface is used to break the airflow and guide the airflow, thereby reducing the contact area between the expansion joint 22 and the strong wind, reducing the wind resistance and reducing the pressure on the expansion joint 22.

[0022] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A low-altitude target detection radar, characterized in that: It includes a telescopic joint one (1), a telescopic joint two (2) is movably embedded at the top center of the telescopic joint one (1), a telescopic joint three (3) is movably embedded at the top center of the telescopic joint two (2), and a detection radar (4) is installed at the top of the telescopic joint three (3). A lower T-shaped locking post (11) is provided on the outer wall of the first telescopic joint (1). A storage groove (21) is provided on one side of the outer wall of the second telescopic joint (2). Four guide posts (211) are symmetrically arranged on the inner wall of the storage groove (21). An inner through groove (212) is provided on the inner wall of the storage groove (21) near the four guide posts (211). A movable plate (22) is movably fitted on the four guide posts (211). A spring (23) is provided between the movable plate (22) and the storage groove (21) and near the outer side of the guide posts (211). An inclined surface (221) is provided at the bottom of the movable plate (22). An alignment concave surface (222) is provided on the outer wall of the movable plate (22) away from the second telescopic joint (2). An outer through groove is provided on the inner wall of the alignment concave surface (222). (223), and a rotating disk (224) is rotatably connected to the inner wall of the aligned concave surface (222) near the outer side of the outer through groove (223). The outer circumferential surface of the rotating disk (224) is provided with several gear teeth (2241) at equal intervals in the circumferential direction. A locking plate (2242) is provided on the outer circumferential surface of the rotating disk (224) near the gear teeth (2241). A bending plate (2243) is provided at one end of the locking plate (2242). An upper T-shaped locking post (225) is provided on the inner wall of the aligned concave surface (222) near the outer side of the outer through groove (223) and above the rotating disk (224). A lifting block (31) is provided on the outer wall of the telescopic joint (3). Several gear teeth (311) are provided on one side of the outer wall of the lifting block (31) at equal intervals in the axial direction.

2. A low-altitude target detection radar according to claim 1, characterized in that: The telescopic joint 2 (2) has a side groove (25) on the outer wall of one side adjacent to the storage groove (21). A servo motor 1 (251) is provided on the lower side of the inner wall of the side groove (25). The servo motor 1 (251) is fixedly connected to a bidirectional trapezoidal screw (2511) through its output end. Two screw nut seats on the bidirectional trapezoidal screw (2511) are fixedly connected to an active block (2512) by screws. A light rod (252) is provided on the upper side of the inner wall of the side groove (25). Two driven blocks (2521) are movably sleeved on the outer wall of the light rod (252). A rotating plate 1 (26) and a rotating plate 2 (27) are respectively provided between the two active blocks (2512) and the two driven blocks (2521). The rotating plate 1 (26) and the rotating plate 2 (27) are hinged together.

3. A low-altitude target detection radar according to claim 1, characterized in that: The bottom of the first telescopic joint (1) is provided with a mounting plate (52) in a circular trajectory. The bottom of the mounting plate (52) is provided with a ring sleeve (51). The bottom of the ring sleeve (51) is provided with a base (5). The center of the bottom of the mounting plate (52) is provided with a servo motor (53). The output end of the servo motor (53) is fixedly connected to the center of the bottom of the first telescopic joint (1).

4. A low-altitude target detection radar according to claim 1, characterized in that: The inner through groove (212) and the outer through groove (223) overlap, and the lifting block (31) moves up and down inside the inner through groove (212) and the outer through groove (223).

5. A low-altitude target detection radar according to claim 1, characterized in that: After a portion of the movable plate (22) is pushed out of the storage groove (21), the outer side wall of the aligned concave surface (222) and the telescopic joint (1) are on the same vertical plane, and an active groove is provided on the outer side wall of the movable plate (22) near the lower side of the aligned concave surface (222) for the circumferential movement of the locking plate (2242).

6. A low-altitude target detection radar according to claim 1, characterized in that: The first telescopic joint (1), the second telescopic joint (2) and the third telescopic joint (3) are all square tube structures. The third telescopic joint (3) may be provided with the same structure as the second telescopic joint (2). The second telescopic joint (2) and the third telescopic joint (3) are both raised and lowered by an electric drive structure.

7. A low-altitude target detection radar according to claim 1, characterized in that: The locking plate (2242) and the bending plate (2243) engage with the lower T-shaped locking post (11), and the bending plate (2243) is located inside the lower T-shaped locking post (11).

8. A low-altitude target detection radar according to claim 1, characterized in that: The length of the second tooth (311) is much greater than the length of the first tooth (2241), and the second tooth (311) and the first tooth (2241) are always in a meshing connection state.

9. A low-altitude target detection radar according to claim 1, characterized in that: The locking plate (2242) and bending plate (2243) can be stored inside the aligned concave surface (222) after circumferential movement as the rotating disk (224) rotates.

10. A low-altitude target detection radar according to claim 2, characterized in that: Both rotating plate one (26) and rotating plate two (27) have rounded chamfers on their opposite outer walls.

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