Locking device for umbrella-shaped antenna in lodging state on semitrailer platform

Abstract

The utility model provides a locking device for a lodging umbrella-shaped antenna on a semitrailer platform, which comprises a mounting bracket, a sliding sleeve assembly, a movable top shaft, a deflector rod, a lead screw and nut assembly, a connecting seat and a top plate, the whole mounting bracket is of a frame type structure, the bottom of the mounting bracket is fixed with a semitrailer gooseneck platform, and the top of the mounting bracket is provided with an annular frame. The lead screw and nut assembly installed on one side of the installation support drives the shifting rod connected with the first lead screw and the movable top shaft to move, so that the top plate reliably presses the front end face of the umbrella-shaped antenna, and the situation that the face of the umbrella-shaped antenna in a lodging state is deformed and damaged due to bumping of a vehicle in the transportation process, and the precision and the normal use function of the antenna are affected is avoided. When the antenna locking device is used, only a nut in the lead screw and nut assembly needs to be rotated, the nut moves to drive the connecting base and the movable top shaft connected with the connecting base to move, the movable top shaft abuts against the top plate fixedly connected with the movable top shaft to move, the top plate body tightly abuts against the front end face of the umbrella-shaped antenna, antenna locking is achieved, and operation is easy.

Description

Technical Field

[0001] This utility model belongs to the field of antenna locking technology, specifically relating to a locking device for an umbrella-shaped antenna in a collapsed state on a semi-trailer platform. Background Technology

[0002] In fields such as electronic warfare, satellite communication, and tracking telemetry, parabolic antennas are widely used due to their high directivity, high transmission power, and ease of fabrication. With the development of parabolic antennas, deployable antennas for vehicle-mounted applications have begun to emerge. Deployable antennas can be categorized by the structure of their reflector surfaces into solid-surface reflector antennas, metal mesh reflector antennas, and thin-film reflector antennas. Solid-surface reflector antennas, primarily composed of multiple rigid metal or carbon fiber plates joined together by hinges, offer reliable structural quality and high reflector surface precision, and have already been applied in deep space exploration.

[0003] Currently, for fixed-surface umbrella antenna equipment, when not in use, the main structure of the umbrella antenna panel generally needs to be folded up and flattened, and the antenna is installed on the rear end of the gooseneck platform of the semi-trailer through a special mechanical interface. The antenna equipment is then fixed by designing locking and fixing devices at the front and middle of the main antenna structure. Utility Model Content

[0004] The applicant discovered that, because the antenna panel is made of carbon fiber, the front end of the antenna panel is prone to deformation, cracking, or even crushing due to frequent vibrations during road transportation, which affects the antenna's deployment and reception capabilities and accuracy. However, existing locking and fixing devices only secure the antenna as a whole to prevent the reflector from spreading out, without taking into account the deformation problem at the front end of the antenna panel.

[0005] Based on the above considerations, this utility model provides a locking device for an umbrella-shaped antenna lying on a semi-trailer platform, which can effectively and reliably lock the front end of the umbrella-shaped antenna to the main antenna structure, solving the problem of damage to the antenna caused by road bumps and other uncontrollable factors during highway transportation.

[0006] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0007] A locking device for a folded umbrella-shaped antenna on a semi-trailer platform includes a mounting bracket, a sliding sleeve assembly, a movable top shaft, a lever, a lead screw and nut assembly, a connecting seat, and a top plate.

[0008] The mounting bracket is a frame structure, wherein the upper part of the mounting bracket is a circular frame; the lower part of the mounting bracket is used to fix it to the gooseneck platform of the semi-trailer, and the axial direction of the circular frame of the mounting bracket is along the body direction of the semi-trailer.

[0009] A plurality of the aforementioned sliding sleeve assemblies are uniformly fixed around the circumference of the annular frame on one side edge of the annular frame, and the axis of the sliding sleeve assembly is along the axial direction of the annular frame; a movable top shaft is installed inside the sliding sleeve assembly, and the movable top shaft is capable of sliding along the axial direction of its inner hole within the sliding sleeve assembly;

[0010] The lead screw and nut assembly is located at the center of the annular frame, and the first lead screw end of the lead screw and nut assembly is fixedly connected to the center of the annular frame; the connecting seat is fitted on the first lead screw and close to the center of the annular frame, and the end face of the connecting seat is in contact with the end face of the nut in the lead screw and nut assembly.

[0011] The other end of the movable top shaft is hinged to the side wall of the connecting seat via the lever;

[0012] The top plate is located on the other side of the mounting bracket; the movable top shaft can extend out of the annular frame along the sliding sleeve assembly under the push of the lever, and can abut against the upper part of the top plate so that the top plate can press against the front end of the umbrella-shaped antenna in the folded state.

[0013] Furthermore, the annular frame includes a first ring and a second ring arranged concentrically from the outside to the inside, and the inner wall of the first ring and the outer wall of the second ring are fixedly connected by a plurality of radially arranged first connecting rods.

[0014] A plurality of first support plates are evenly distributed circumferentially between the first ring and the second ring, and the first support plates are fixed between two adjacent first connecting rods;

[0015] The sliding sleeve assembly is mounted on the first support plate.

[0016] Furthermore, the sliding sleeve assembly includes a first bushing, a first flange, a spring washer, a spring, and a positioning pin; the first bushing passes through the center hole of the first flange and is vertically fixed to the first support plate through the first flange;

[0017] The movable top shaft passes through the inner hole of the first bushing and can reciprocate along the inner hole of the first bushing; when the end of the movable top shaft extends out, it can abut against the top plate.

[0018] The movable top shaft is coaxially provided with an elastic washer at the shaft end near the lever, and a spring is fitted on the outer wall of the movable top shaft. One end of the spring is constrained on the end face of the elastic washer, and the other end is constrained on the surface of the top plate after the end of the movable top shaft abuts against the top plate. The spring is used to provide a restoring force to disengage the movable top shaft from the top plate.

[0019] The first bushing has a locating pin mounted radially on its sidewall, the locating pin being used to prevent the first bushing from radially shifting.

[0020] Furthermore, the annular frame has a second connecting rod and a third connecting rod arranged in parallel in the middle;

[0021] The two ends of the second and third connecting rods are welded and fixed to the inner wall of the second ring;

[0022] A second support plate is provided between the middle of the second connecting rod and the third connecting rod, and the second support plate has a central through hole;

[0023] It also includes a second flange, which is fixed to the second support plate, and the axis of the second flange coincides with the axis of the center hole of the second support plate;

[0024] One end of the first lead screw is fixedly mounted on the second support plate via the second flange.

[0025] Furthermore, it also includes a double-row tapered roller bearing, the inner wall of the center hole of the double-row tapered roller bearing having an internal thread that mates with the first lead screw;

[0026] The double-row tapered roller bearing is coaxially mounted on the first lead screw and is positioned away from the lead screw nut; the end face of the double-row tapered roller bearing is in contact with the end face of the connecting seat.

[0027] Furthermore, the sliding sleeve assembly, the movable top shaft, and the lever connected to the movable top shaft are all provided in three parts, and are located on the upper half of the annular frame;

[0028] It also includes two auxiliary locking devices, symmetrically arranged in the lower half of the annular frame, for abutting against the lower half of the top plate along the axial direction of the top plate, so that the lower half of the top plate can lock the front end face of the lower half of the umbrella-shaped antenna in the folded state.

[0029] Furthermore, the auxiliary locking device includes a connecting plate, a second bushing, a third flange, a guide rod shaft, a second lead screw, and a hand crank; the connecting plate is located at the lower part of the mounting bracket, and its two ends are fixedly connected to the first ring and the second ring; the connecting plate has a mounting through hole for mounting the third flange;

[0030] The second bushing passes through the center hole of the third flange and is vertically fixed to the connecting plate through the third flange; the guide rod shaft has a central threaded through hole opened along its axial direction, the guide rod shaft is located in the second bushing, can rotate in the second bushing, and will not move axially during rotation;

[0031] One end of the second lead screw is engaged with the central threaded through hole of the guide rod shaft, and the other end extends out of the guide rod shaft and the second bushing. The second lead screw does not rotate synchronously with the guide rod shaft during the rotation of the guide rod shaft. It can only be spirally fed along its axis under the drive of the guide rod shaft to abut against the lower part of the top plate.

[0032] The hand crank is radially fixed to the end of the guide rod shaft and is used to drive the guide rod shaft to rotate.

[0033] Furthermore, it also includes several guide rods, which are fixedly mounted on the first connecting rod along the axial direction of the annular frame, and the guide rods pass through the first connecting rod, and the extended ends of the guide rods can contact the surface of the top plate.

[0034] Furthermore, the third connecting rod is located below the second connecting rod;

[0035] It also includes a support frame, one end of the two struts of the support frame is inserted into the third connecting rod body, and the other end is fixed to the top of the front section of the gooseneck platform of the semi-trailer, so as to fix the bottom of the mounting bracket to the top of the rear section of the gooseneck platform of the semi-trailer.

[0036] Furthermore, it also includes a lever bracket; the lever bracket includes two parallel triangular support plates; one side of the triangular support plate is fixed to the end face of the second ring and the plate surface of the first support plate;

[0037] The lever body is located between the two triangular support plates and is hinged to the apex angle of the two triangular support plates.

[0038] The advantages of this utility model are:

[0039] 1. This utility model is designed with a mounting bracket and a top plate. The screw and nut assembly installed on one side of the mounting bracket drives the lever connected to the first screw and the movable top shaft to move in a direction parallel to the antenna's tilting direction. This ensures that the top plate reliably presses the front end of the umbrella-shaped antenna, preventing deformation and damage to the umbrella-shaped antenna surface caused by vehicle bumps during transportation, which would affect the antenna's accuracy and normal operation. This improves the reliability and mobility of the umbrella-shaped antenna equipment.

[0040] 2. This utility model is simple to use. It only requires rotating the screw nut in the screw nut assembly. The movement of the screw nut will drive the connecting seat and the movable top shaft connected to the connecting seat to move. The movable top shaft will push against the top plate that is fixedly connected to it, and the top plate will press tightly against the front end surface of the umbrella-shaped antenna to lock the antenna.

[0041] 3. This utility model also includes an auxiliary locking device. By rotating the hand crank of the auxiliary locking device, the second lead screw in the auxiliary locking device is screwed forward and pushes the top plate to move, so that the top plate abuts against the front end face of the lower part of the umbrella-shaped antenna in the fallen state, thereby achieving auxiliary locking of the lower part of the antenna and playing a safety role.

[0042] 4. This utility model is designed with a guide rod, which is fixed axially on the mounting bracket. The length of the rod between the mounting bracket and the top plate is obtained by calculation and testing. On the one hand, the guide rod plays a guiding role during the movement of the movable top shaft, and on the other hand, it plays a limiting role. When the guide rod contacts the top plate, it proves that the movable top shaft has moved into place, ensuring that the movable top shaft effectively presses the antenna end face onto the main antenna structure, while avoiding excessive movement of the movable top shaft, which would cause excessive locking load.

[0043] 5. The first ring, second ring, first connecting rod, third connecting rod, and support frame of the locking device of this utility model are all made of channel steel, which makes the locking device as a whole have strong bending and compression resistance, high reliability, and can meet the requirement that the antenna end face does not deform during long-distance and long-term transportation, and is convenient for maintenance.

[0044] 6. This utility model is small in size and compact in layout, making full use of the gooseneck platform space of the semi-trailer, and is easy to disassemble and maintain. Attached Figure Description

[0045] Figure 1 This is a three-dimensional structural diagram of the locking device of this utility model;

[0046] Figure 2 yes Figure 1 The main view;

[0047] Figure 3 yes Figure 1 Rear view;

[0048] Figure 4 yes Figure 1 Side view;

[0049] Figure 5 yes Figure 4 A sectional view;

[0050] Figure 6 yes Figure 1 A partially enlarged schematic diagram of the middle sliding sleeve assembly;

[0051] Figure 7 This is a schematic diagram showing the cooperation between the locking device of this utility model, the semi-trailer platform, and the umbrella-shaped antenna in a collapsed state. The locking device of this utility model is shown in the dashed box in the figure.

[0052] In the diagram: 1-Mounting bracket, 101-First ring, 102-Second ring, 103-Polygonal frame, 104-First connecting rod, 105-First support plate, 106-Second connecting rod, 107-Third connecting rod, 108-Second support plate, 2-Sliding sleeve assembly, 201-First bushing, 202-First flange, 203-Spring washer, 204-Spring, 205-Positioning pin, 3-Modible top shaft, 4-Toggle lever, 5-First lead screw, 6-Nut, 7-Connecting seat, 8-Top plate, 9-Second flange, 10-Auxiliary locking device, 1001-Connecting plate, 1002-Third flange, 1003-Guide rod shaft, 1004-Second lead screw, 1005-Hand crank, 11-Guide rod, 12-Support frame, 13-Toggle lever bracket. Detailed Implementation

[0053] The embodiments of the present invention are described in detail below. These embodiments are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0054] Reference Figures 1-4 This embodiment provides a locking device for a collapsed umbrella-shaped antenna on a semi-trailer platform, including a mounting bracket 1, a sliding sleeve assembly 2, a movable top shaft 3, a lever 4, a first lead screw 5, a lead nut 6, a connecting seat 7, a top plate 8, a second flange 9, an auxiliary locking device 10, a guide rod 11, a support frame 12, and a lever bracket 13. The mounting bracket 1 has an overall frame structure, providing a mounting base for the installation of other components. The sliding sleeve assembly 2, the movable top shaft 3, the lever 4, the first lead screw 5, the lead nut 6, the connecting seat 7, the second flange 9, the auxiliary locking device 10, the guide rod 11, the support frame 12, and the lever bracket 13 are all located on one side of the mounting bracket 1, and the top plate 8 is located on the other side of the mounting bracket 1.

[0055] The upper part of the mounting bracket 1 is a circular frame, which includes a first ring 101 and a second ring 102 arranged concentrically, with the first ring located outside the second ring. The inner wall of the first ring 101 and the outer wall of the second ring 102 are fixedly connected by a plurality of radially arranged first connecting rods 104, which reliably connect the first ring and the second ring. A plurality of first support plates 105 are arranged circumferentially between the first ring and the second ring, and the two ends of the first support plates 105 are respectively welded and fixed between two adjacent first connecting rods 104.

[0056] Several sliding sleeve assemblies 2 are arranged circumferentially between the first ring and the second ring. A movable top shaft 3 is coaxially installed inside the sliding sleeve assembly 2. One end of the movable top shaft 3 is hinged to the end of the lever 4, and the other end is fixedly connected to the top plate 8. Under the pushing action of the lever 4, the movable top shaft 3 can slide axially along the inner hole of the sliding sleeve assembly 2 to push the top plate 8 to move. Specifically, the movable top shaft 3 is a two-stage rod shape. One end is provided with a hinge hole for hinged with the lever 4, and the outer wall of the other end has an external thread that matches the threaded hole on the top plate 8 to fix the movable top shaft 3 to the top plate 8.

[0057] Specifically, refer to Figure 6 The sliding sleeve assembly 2 includes a first bushing 201, a first flange 202, a spring washer 203, a spring 204, and a positioning pin 205. The first bushing 201 passes through the center hole of the first flange 202 and is vertically fixed to the first support plate 105 through the first flange 202. The movable top shaft 3 passes through the inner hole of the first bushing 201 and can reciprocate along the inner hole of the first bushing. When the end of the movable top shaft 3 extends out, it can abut against the top plate 8. Specifically, it can be fixedly connected to the top plate through a threaded hole on the top plate 8. A spring washer 203 is coaxially mounted on the movable top shaft 3 near the shaft end of the lever 4, and a spring 204 is fitted on the outer wall of the movable top shaft 3. One end of the spring is constrained on the end face of the spring washer 203, and the other end is constrained on the surface of the top plate 8 after the end of the movable top shaft 3 is connected to the top plate 8. The first bushing 201 has a radially opening pin hole on its side wall, and a positioning pin 205 is installed in the pin hole. The positioning pin 205 is used to prevent the first bushing 201 from radially shifting. When locking is required, the screw nut 6 is rotated, the first screw 5 moves, and then drives the movable top shaft 3, which is hinged to the lever 4, to move through the lever 4. After the movable top shaft 3 abuts against the top plate 8, it pushes the top plate to contact the antenna surface and locks the antenna surface. When unlocking is required, the movable top shaft 3 moves in the opposite direction and away from the top plate under the restoring force of the spring 204 on it.

[0058] The annular frame has a second connecting rod 106 and a third connecting rod 107 arranged in parallel in the middle. The third connecting rod 107 is located below the second connecting rod 106. The two ends of the second and third connecting rods are welded and fixed to the inner wall of the second annular frame 102. A second support plate 108 is provided between the middle of the second and third connecting rods. The second support plate 108 has a central through hole for installing the end of the first lead screw 5 of the lead screw nut assembly into the central through hole of the second support plate 108. A second flange 9 is provided in the middle of the second support plate 108, coaxial with its central through hole. The first lead screw 5 is fixed to the second support plate by the second flange 9 and bolts. A connecting seat 7 is fitted onto the first lead screw 5 with a threaded connection, and the connecting seat 7 is located between the lead nut 6 and the second support plate 108. One end face of the connecting seat 7 contacts the end face of the lead nut and can move along the first lead screw 5 under the drive of the lead nut. The first lead screw 5 plays a transmission and guiding role. The two ends of the lever 4 are hinged to the side wall of the connecting seat 7 and the end of the movable top shaft 3, respectively. A double-row tapered roller bearing is coaxially mounted on the first lead screw 5. The inner wall of the center hole of the double-row tapered roller bearing has an internal thread that mates with the first lead screw. The other end face of the connecting seat 7 contacts the end face of the double-row tapered roller bearing. Since the antenna will be subjected to heavy loads and significant impact loads during transportation, the use of the double-row tapered roller bearing effectively optimizes the axial and radial load distribution, preventing axial deformation of the first lead screw. The connecting seat 7 includes a ring and multiple connecting parts extending radially outward from the side wall of the ring. These connecting parts are right-angled U-shaped pieces, with a mounting through hole at the open end for hinged connection with the end of the lever 4. Since this embodiment has three levers, three right-angled U-shaped pieces are provided on the side wall of the ring.

[0059] The lower part of the mounting bracket is a polygonal frame 103 connected to the first ring 101. This polygonal frame 103 is used to fix the mounting bracket 1 vertically to the top surface of the rear section of the gooseneck platform of the semi-trailer. In this embodiment, it is a symmetrically arranged pentagonal frame.

[0060] In this embodiment, three sliding sleeve assemblies 2, three movable top shafts 3, and three levers hinged to the movable top shafts are provided, and they are located on the upper half of the annular frame. It also includes two auxiliary locking devices 10 symmetrically arranged on the lower half of the annular frame. The auxiliary locking devices 10 are used to abut against the lower half of the top plate 8, so that the lower half of the top plate 8 can press against the front end face of the lower half of the umbrella-shaped antenna in its folded state. (Refer to...) Figure 2 , Figure 4 and Figure 5The auxiliary locking device includes a connecting plate 1001, a second bushing, a third flange 1002, a guide rod shaft 1003, a second lead screw 1004, and a hand crank 1005. The second bushing is not shown in the figure due to obstruction. The connecting plate 1001 is located at the lower part of the mounting bracket and its two ends are welded to the first ring and the second ring. The connecting plate 1001 has a mounting through hole for mounting the third flange 1002. The second bushing passes through the center hole of the third flange and is vertically fixed to the connecting plate 1001 through the third flange 1002. The guide rod shaft 1003 has a central threaded through hole opened along its axial direction. The guide rod shaft 1003 is located inside the second bushing and can rotate within the second bushing without axial movement during rotation. The second lead screw 1004 passes through the central threaded through hole of the guide rod shaft 1003. One end of the lead screw engages with the central threaded through hole of the guide rod shaft, while the other end extends out of the guide rod shaft and the second bushing. During the rotation of the guide rod shaft, the second lead screw does not rotate synchronously with the guide rod shaft; it can only be helically fed along its axial direction under the drive of the guide rod shaft. The hand crank 1005 is radially fixed on the guide rod shaft 1003. Rotating the hand crank in the forward direction causes the guide rod shaft 1003 to rotate, driving the second lead screw 1004 to extend from the guide rod shaft and press against the top plate 8, thus locking the lower part of the top plate 8. Rotating the hand crank in the reverse direction causes the second lead screw to retract into the guide rod shaft, completing the unlocking process.

[0061] In this embodiment, several guide rods 11 are designed. The guide rods 11 are fixedly installed on the first connecting rod 104 along the axial direction of the annular frame, and the rod body of the guide rod 11 passes through the first connecting rod 104. The end of the extended section of the guide rod can contact the surface of the top plate 8. The length of the rod body on the guide rod located between the mounting bracket and the top plate is determined according to the calculated and tested travel of the movable top shaft 3. On the one hand, the guide rod plays a guiding role during the movement of the movable top shaft, and on the other hand, it plays a limiting role. When the end face of the extended section of the guide rod 11 contacts the top plate 8, it proves that the movable top shaft 3 has moved into place, ensuring that the movable top shaft effectively presses the antenna end face onto the main antenna structure, while avoiding excessive movement of the movable top shaft, which would cause excessive locking load.

[0062] The support frame 12 is generally I-shaped. One end of the two support rods of the support frame 12 is inserted into the third connecting rod 107. The other end of the two support rods is fixed to the top of the front section of the semi-trailer gooseneck platform so as to support the entire mounting bracket on the semi-trailer gooseneck platform.

[0063] The lever bracket 13 includes two parallel triangular support plates, one side of which is fixed to the end face of the second ring and the surface of the first support plate 105. The lever 4, with its body near the position connected to the movable top shaft, is located between the two triangular support plates and is hinged to the apex angle of the two triangular support plates.

[0064] In this embodiment, the first ring 101, the second ring 102, the first connecting rod 104, the third connecting rod 107, and the support frame 12 are all made of channel steel, which can effectively distribute the load and improve the bending strength of the components. Furthermore, a thin plate coaxially arranged is fixed to the end face of the first ring 101 and the second ring 102 near the top plate 8. This thin plate is welded and fixed to the first and second rings, which on the one hand further improves the support strength of the mounting bracket, and on the other hand, the thin plate closes the edges of the first and second rings, making the mounting bracket aesthetically pleasing.

[0065] Reference Figure 7 In use, the bottom of the polygonal frame in this utility model is vertically fixed to the top of the rear section of the gooseneck platform of the semi-trailer with bolts; one end of the two support rods of the support frame is clamped on the third connecting rod 107 of the mounting bracket, the angle of the support frame is adjusted, and the other end of the two support rods is fixed to the top of the front section of the gooseneck platform of the semi-trailer with connecting pieces and bolts.

[0066] The screw nut 6 of the rotating screw nut assembly moves along the first screw 5, driving the connecting seat 7 connected to it to move. The connecting seat 7 drives the lever 4 and the movable top shaft 3 connected in sequence to move. The movable top shaft 3 moves out and abuts against the top plate 8 and presses the front end face of the umbrella antenna, thereby achieving axial locking of the umbrella antenna.

[0067] To ensure that the entire top plate reliably presses against the front end of the antenna, the hand crank of the auxiliary locking device can be rotated simultaneously to assist the push rod in the components to move the lower part of the top plate 8, so that the lower part of the top plate 8 reliably presses against the front end of the lower part of the antenna.

[0068] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model.

Claims

1. A locking device for a folded umbrella-shaped antenna on a semi-trailer platform, characterized in that, Includes mounting bracket, sliding sleeve assembly, movable top shaft, lever, lead screw and nut assembly, connecting seat and top plate; The mounting bracket is a frame structure, wherein the upper part of the mounting bracket is a circular frame; the lower part of the mounting bracket is used to fix it to the gooseneck platform of the semi-trailer, and the axial direction of the circular frame of the mounting bracket is along the body direction of the semi-trailer. A plurality of the aforementioned sliding sleeve assemblies are uniformly fixed around the circumference of the annular frame on one side edge of the annular frame, and the axis of the sliding sleeve assembly is along the axial direction of the annular frame; a movable top shaft is installed inside the sliding sleeve assembly, and the movable top shaft is capable of sliding along the axial direction of its inner hole within the sliding sleeve assembly; The lead screw and nut assembly is located at the center of the annular frame, and the first lead screw end of the lead screw and nut assembly is fixedly connected to the center of the annular frame; the connecting seat is fitted on the first lead screw and close to the center of the annular frame, and the end face of the connecting seat is in contact with the end face of the nut in the lead screw and nut assembly. The other end of the movable top shaft is hinged to the side wall of the connecting seat via the lever; The top plate is located on the other side of the mounting bracket; The movable top shaft can extend out of the annular frame along the sliding sleeve assembly under the push of the lever, and can abut against the upper part of the top plate so that the top plate can press against the front end of the umbrella-shaped antenna in the folded state.

2. The locking device according to claim 1, characterized in that, The annular frame includes a first ring and a second ring arranged concentrically from the outside to the inside. The inner wall of the first ring and the outer wall of the second ring are fixedly connected by a plurality of radially arranged first connecting rods. A plurality of first support plates are evenly distributed circumferentially between the first ring and the second ring, and the first support plates are fixed between two adjacent first connecting rods; The sliding sleeve assembly is mounted on the first support plate.

3. The locking device according to claim 2, characterized in that, The sliding sleeve assembly includes a first bushing, a first flange, a spring washer, a spring, and a positioning pin; the first bushing passes through the center hole of the first flange and is vertically fixed to the first support plate through the first flange; The movable top shaft passes through the inner hole of the first bushing and can reciprocate along the inner hole of the first bushing; when the end of the movable top shaft extends out, it can abut against the top plate. The movable top shaft is coaxially provided with an elastic washer at the shaft end near the lever, and a spring is fitted on the outer wall of the movable top shaft. One end of the spring is constrained on the end face of the elastic washer, and the other end is constrained on the surface of the top plate after the end of the movable top shaft abuts against the top plate. The spring is used to provide a restoring force to disengage the movable top shaft from the top plate. The first bushing has a locating pin mounted radially on its sidewall, the locating pin being used to prevent the first bushing from radially shifting.

4. The locking device according to claim 3, characterized in that, The annular frame has a second connecting rod and a third connecting rod arranged in parallel in the middle. The two ends of the second connecting rod and the third connecting rod are welded and fixed to the inner wall of the second ring; A second support plate is provided between the middle of the second connecting rod and the third connecting rod, and the second support plate has a central through hole; It also includes a second flange, which is fixed to the second support plate, and the axis of the second flange coincides with the axis of the center hole of the second support plate; One end of the first lead screw is fixedly mounted on the second support plate via the second flange.

5. The locking device according to claim 4, characterized in that, It also includes a double-row tapered roller bearing, the inner wall of the center hole of the double-row tapered roller bearing having an internal thread that mates with the first lead screw; The double-row tapered roller bearing is coaxially mounted on the first lead screw and is positioned away from the lead screw nut; the end face of the double-row tapered roller bearing is in contact with the end face of the connecting seat.

6. The locking device according to claim 1 or 2, characterized in that, The sliding sleeve assembly, the movable top shaft, and the lever connected to the movable top shaft are all provided in three parts, and are located on the upper half of the annular frame; It also includes two auxiliary locking devices, symmetrically arranged in the lower half of the annular frame, for abutting against the lower half of the top plate along the axial direction of the top plate, so that the lower half of the top plate can lock the front end face of the lower half of the umbrella-shaped antenna in the folded state.

7. The locking device according to claim 6, characterized in that, The auxiliary locking device includes a connecting plate, a second bushing, a third flange, a guide rod shaft, a second lead screw, and a hand crank; the connecting plate is located at the lower part of the mounting bracket and its two ends are fixedly connected to the first ring and the second ring; the connecting plate has a mounting through hole for mounting the third flange; The second bushing passes through the center hole of the third flange and is vertically fixed to the connecting plate through the third flange; the guide rod shaft has a central threaded through hole opened along its axial direction, the guide rod shaft is located in the second bushing, can rotate in the second bushing, and will not move axially during rotation; One end of the second lead screw is engaged with the central threaded through hole of the guide rod shaft, and the other end extends out of the guide rod shaft and the second bushing. The second lead screw does not rotate synchronously with the guide rod shaft during the rotation of the guide rod shaft. It can only be spirally fed along its axis under the drive of the guide rod shaft to abut against the lower part of the top plate. The hand crank is radially fixed to the end of the guide shaft and is used to drive the guide shaft to rotate.

8. The locking device according to claim 2, characterized in that, It also includes several guide rods, which are fixedly mounted on the first connecting rod along the axial direction of the annular frame, and the guide rods pass through the first connecting rod, and the extended ends of the guide rods can contact the surface of the top plate.

9. The locking device according to claim 4, characterized in that, The third connecting rod is located below the second connecting rod; It also includes a support frame, one end of the two struts of the support frame is inserted into the third connecting rod body, and the other end is fixed to the top of the front section of the gooseneck platform of the semi-trailer, so as to fix the bottom of the mounting bracket to the top of the rear section of the gooseneck platform of the semi-trailer.

10. The locking device according to claim 2, characterized in that, It also includes a lever bracket; the lever bracket includes two parallel triangular support plates; one side of the triangular support plate is fixed to the end face of the second ring and the plate surface of the first support plate; The lever body is located between the two triangular support plates and is hinged to the apex angle of the two triangular support plates.

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