Antenna lifting mechanism for emergency communication vehicle

Abstract

The application discloses an antenna lifting mechanism for an emergency communication vehicle, which comprises a multistage plunger oil cylinder, the multistage plunger oil cylinder comprises a cylinder barrel and at least two levels of intermediate piston sleeve rods which are arranged in cooperation, and a central piston rod is arranged in the innermost intermediate piston sleeve rod in cooperation; the outer end of the central piston rod is provided with a coaxially arranged blind hole, a supporting rod is telescopically arranged in the blind hole, a transmission thread is arranged on the supporting rod, and the outer diameter of the transmission thread is consistent with the inner diameter of the blind hole; a first holder plate is coaxially arranged on the outer end of the central piston rod, a driving nut which is arranged in cooperation with the transmission thread is sleeved on the supporting rod, the driving nut is rotatably arranged on the first holder plate, and a driving mechanism for driving the driving nut to rotate is further arranged on the first holder plate. The application has the advantages of ingenious structure design, easy maintenance and the like, and can ensure that the height difference of two antennas is kept during lifting.

Description

Technical Field

[0001] This invention relates to the field of special vehicle technology, and in particular to an antenna lifting mechanism for emergency communication vehicles. Background Technology

[0002] In the event of natural disasters, large gatherings, or other temporary network coverage needs, existing mobile communication base stations are often easily destroyed or congested. Emergency communication vehicles, as a supplement to emergency network coverage, can effectively alleviate the signal pressure caused by sudden communication peaks. They will also further enhance the brand competitiveness of communication operators, thereby improving the network's reputation and customer loyalty. Furthermore, they can avoid the problem of idle and wasted resources that may be caused by adding base stations in these areas, thus saving network investment costs.

[0003] With the continuous development of wireless communication technologies such as 4G and 5G, operators often provide two wireless communication services simultaneously to ensure normal user operation, and emergency communication vehicles also need to be equipped with two types of antennas. There are two main ways to install these two antennas. One method uses a dual-mast setup, where each antenna is equipped with a lifting mechanism, as disclosed in Chinese patent literature (application publication number CN111885751A). While this structure can simply meet the needs of dual-antenna use, the dual-mast setup requires more vehicle space and an additional set of key equipment, resulting in higher costs. The other method involves installing both antennas simultaneously on a single lifting mechanism. After being raised, the two antennas must have a height difference, and this height difference must be maintained throughout the raising process.

[0004] Currently, the commonly used lifting mechanism is a multi-stage hydraulic cylinder. The existing single-acting multi-stage piston hydraulic cylinder operates in the following sequence: the piston rod extends sequentially according to its cross-sectional area from largest to smallest, and retracts sequentially according to its cross-sectional area from smallest to largest. This sequence is determined by the pressure and force-bearing area within the hydraulic cylinder. However, antennas are typically mounted on the two sections of the piston rod with the smallest cross-section, making it impossible for either antenna to form a height difference during either ascent or descent. Chinese patent literature discloses a single-acting multi-stage piston hydraulic cylinder with controllable extension and retraction sequence (authorization announcement number CN103790892B), which uses a one-way sealing sleeve assembly to achieve sequential extension of the cylinder from smallest to largest cross-sectional area. However, in actual use, to control the one-way sealing sleeve assembly, the hydraulic system pressure experiences rapid increases and decreases, easily generating vibration and noise, resulting in poor operational stability. Furthermore, if the one-way sealing sleeve assembly is damaged, the cylinder may fail to retract, rendering the vehicle immobile and requiring on-site maintenance, which is difficult. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is: how to provide an emergency communication vehicle antenna lifting mechanism with an ingenious structural design that can ensure that the two antennas maintain a height difference during the raising process, is easy to maintain, and operates smoothly.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An antenna lifting mechanism for an emergency communication vehicle includes a multi-stage plunger cylinder. The multi-stage plunger cylinder comprises a cylinder barrel, within which at least two intermediate piston sleeves are sequentially fitted, with a central piston rod fitted within the innermost intermediate piston sleeve. The outer end of the central piston rod has a coaxially arranged blind hole, within which a support rod is retractably fitted. The support rod has a transmission thread, the outer diameter of which is the same as the inner diameter of the blind hole. A first gimbal plate is coaxially mounted on the outer end of the central piston rod. A drive nut, which engages with the transmission thread, is sleeved on the support rod. The drive nut is rotatably mounted on the first gimbal plate, and the first gimbal plate also has a drive mechanism for driving the drive nut to rotate.

[0007] Using the above structure, the drive mechanism on the first gimbal plate drives the drive nut to rotate relative to the first gimbal plate. Due to the transmission thread engagement between the drive nut and the support rod, the rotation of the drive nut causes the support rod to extend and retract within the blind hole of the central piston rod. Utilizing the self-locking characteristic of the threaded transmission, the extended length of the support rod can be kept constant. In use, the two antennas are respectively mounted on the first gimbal plate and the outer end of the support rod. By first extending the support rod, the two antennas maintain a height difference, and then the multi-stage plunger cylinder raises both antennas together. This structure, by directly setting a blind hole and support rod at the outer end of the innermost central piston rod in a mature plunger cylinder structure, and using a separately set support rod to maintain the height difference between the two antennas, ensures that the two antennas maintain a height difference during the raising process. Moreover, the mature plunger cylinder structure operates smoothly, is easier to maintain, and will not fail to retract due to malfunction. In addition, maintaining a fixed height difference between the two antennas during ascent and descent can also prevent them from colliding and being damaged due to being too close during ascent and descent.

[0008] Furthermore, the support rod has a guide groove arranged along its length, and the guide groove passes through the corresponding transmission thread along the axial direction of the support rod; a limiting seat is fixedly installed on the first gimbal plate, and the limiting seat has a guide block that cooperates with the guide groove.

[0009] In this way, since the limiting seat is fixedly installed on the first gimbal plate, and the guide block on the limiting seat is engaged with the guide groove of the support rod, the support rod cannot rotate relative to the first gimbal plate. When the drive nut rotates relative to the first gimbal plate, the support rod remains stationary relative to the drive nut in the circumferential direction. The drive nut converts the rotation into the axial extension and retraction of the support rod through the threaded engagement, making the operation more reliable.

[0010] Furthermore, the length of the guide block is greater than the lead of the transmission thread.

[0011] This ensures that the guide block always engages with the guide groove on at least one drive thread, thereby limiting the rotation of the support rod in the circumferential direction.

[0012] Furthermore, the guide block has guide portions extending from both ends in opposite directions, and the thickness of the guide portions gradually decreases in the direction away from the guide block.

[0013] In this way, as the guide block slides relative to the guide groove of the support rod, the smaller end thickness of the guide part prevents the guide block from colliding with the transmission thread and damaging the transmission thread when it slides into the guide groove of the next transmission thread, thus improving the reliability of the thread transmission.

[0014] Furthermore, the limiting seat is a flange seat sleeved on the support rod, the flange seat has a guide hole that matches the diameter of the support rod, and the guide block is protrudingly formed in the guide hole; the flange seat is fixedly installed on the first gimbal plate by bolts, and the drive nut is rotatably disposed between the first gimbal plate and the flange seat.

[0015] Furthermore, the drive nut includes a cylindrical nut body with a radially protruding gear disk in the middle. The drive mechanism includes a drive motor mounted from bottom to top on the first gimbal plate. The output shaft of the drive motor passes through the first gimbal plate and is fitted with a pinion that meshes with the gear disk. The diameter of the pinion is smaller than the diameter of the gear disk.

[0016] In this way, the drive motor meshes with the gear disk through a small gear with a smaller diameter to achieve deceleration drive, increase drive torque, and ensure that the drive nut reliably drives the support rod to rise and fall.

[0017] Furthermore, a radial thrust bearing is installed at the lower end of the nut body, and the first gimbal plate has a first bearing hole corresponding to the radial thrust bearing, and the radial thrust bearing is installed in the first bearing hole.

[0018] Since the weight of the antenna on the support rod is applied to the drive nut through the transmission thread, the drive nut applies pressure to the first gimbal plate along the axial direction. The use of a radial thrust bearing not only has good pressure bearing capacity, but also ensures the reliable rotation of the drive nut.

[0019] Furthermore, a ball bearing is installed at the upper end of the nut body, and the flange seat has a second bearing hole corresponding to the ball bearing, and the ball bearing is installed in the second bearing hole.

[0020] Since the upper end of the drive nut does not bear axial force, it is mainly used to assist the radial thrust bearing in achieving smooth rotation of the drive nut, and a ball bearing can be used.

[0021] Furthermore, the bottom of the flange seat has a protruding support block, which is distributed circumferentially along the gear disk and abuts against the first gimbal plate.

[0022] In this way, by distributing the support blocks against the first gimbal plate, the positional relationship between the flange seat and the first gimbal plate can be made more reliable, thereby ensuring the reliable rotation of the drive nut.

[0023] In summary, this invention has the advantages of ingenious structural design, which can ensure that the two antennas maintain a height difference during the rise process, and is easy to maintain and operate smoothly. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a multi-stage plunger cylinder.

[0025] Figure 2 This is a cross-sectional structural diagram of the support rod and the central piston rod.

[0026] Figure 3 This is a schematic diagram of the limit seat.

[0027] Figure 4 This is a schematic diagram showing the fit between the guide block and the guide groove. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the embodiments.

[0029] In a specific implementation: an emergency communication vehicle antenna lifting mechanism includes a multi-stage plunger cylinder. The multi-stage plunger cylinder includes a cylinder barrel 1, within which at least two intermediate piston sleeves 2 are sequentially arranged, with a central piston rod 3 arranged within the innermost intermediate piston sleeve 2. The outer end of the central piston rod 3 has a coaxially arranged blind hole, within which a support rod 4 is retractably fitted. Figure 1As shown, the support rod 4 is provided with a transmission thread (not shown in the figure), the outer diameter of which is the same as the inner diameter of the blind hole. A rubber buffer pad is also installed at the bottom of the support column 4, and a second gimbal plate is installed at the top of the support column 4. A first gimbal plate 5 is coaxially installed at the outer end of the central piston rod 3. A drive nut 6 that mates with the transmission thread is sleeved on the support rod 4. The drive nut 6 is rotatably mounted on the first gimbal plate 5, and a drive mechanism 7 for driving the drive nut 6 to rotate is also provided on the first gimbal plate 5.

[0030] To prevent the support rod 4 from rotating synchronously when the drive nut 6 rotates, the support rod 4 has a guide groove 42 arranged along its length, and the guide groove 42 passes through the corresponding transmission thread along the axial direction of the support rod 4. A limiting seat 8 is fixedly installed on the first gimbal plate 5, and the limiting seat 8 has a guide block 81 that cooperates with the guide groove 42. The length of the guide block 81 is greater than the lead of the transmission thread. In this way, it can be ensured that the guide block always cooperates with the guide groove on at least one transmission thread to limit the rotation of the support rod in the circumferential direction.

[0031] Furthermore, to allow the guide block 81 to move more smoothly within the guide groove 42, guide portions are formed at both ends of the guide block 81 extending in opposite directions. The thickness of the guide portions gradually decreases in the direction away from the guide block 81, and their fit is as follows: Figure 4 As shown.

[0032] like Figure 2 and Figure 3 As shown, the limiting seat 8 is a flange seat sleeved on the support rod 4. The flange seat has a guide hole that matches the diameter of the support rod 4. The guide block 81 protrudes into the guide hole. The flange seat is fixedly installed on the first gimbal plate 5 by bolts. The drive nut 6 is rotatably disposed between the first gimbal plate 5 and the flange seat.

[0033] The drive nut 6 includes a cylindrical nut body with a radially protruding gear disk at its center. The drive mechanism 7 includes a drive motor 71 mounted from bottom to top on the first gimbal plate 5. The output shaft of the drive motor 71 passes through the first gimbal plate 5 and is fitted with a pinion 72 that meshes with the gear disk. The diameter of the pinion 72 is smaller than the diameter of the gear disk. In this way, the drive motor achieves deceleration drive by meshing with the gear disk through the smaller diameter pinion, increasing the drive torque and ensuring that the drive nut reliably drives the support rod to rise and fall.

[0034] A radial thrust bearing is installed at the lower end of the nut body. The first gimbal plate 5 has a first bearing hole corresponding to the radial thrust bearing, and the radial thrust bearing is installed in the first bearing hole. Since the weight of the antenna on the support rod is applied to the drive nut through the transmission thread, the drive nut applies pressure to the first gimbal plate axially. Using a radial thrust bearing provides both good pressure bearing capacity and ensures reliable rotation of the drive nut.

[0035] A ball bearing is mounted on the upper end of the nut body, and a second bearing hole corresponding to the ball bearing is provided on the flange seat. The ball bearing is installed in the second bearing hole. Since the upper end of the drive nut does not bear axial force, it is mainly used to assist the radial thrust bearing in realizing the smooth rotation of the drive nut, and a ball bearing is sufficient.

[0036] The flange seat has a protruding support block at its bottom, which is distributed circumferentially along the gear disc and abuts against the first gimbal plate 5. In this way, the distributed support blocks (support columns) abutting against the first gimbal plate ensure a more reliable positional relationship between the flange seat and the first gimbal plate, thereby guaranteeing the reliable rotation of the drive nut.

[0037] The antenna lifting mechanism with the above structure mounts the antennas on the first and second gimbals respectively. When the antenna is raised, the drive motor 71 drives the pinion 72 to rotate. The speed ratio between the pinion and the gear disc on the drive nut 6 achieves a deceleration and torque increase effect. After the drive nut 6 rotates, the guide block 81 in the guide groove 42 of the support rod 4 prevents the support rod 4 from rotating synchronously. Through the threaded transmission between the two, the support rod 4 rises axially, separating the antenna mounted on the second gimbal from the antenna mounted on the first gimbal. After the second gimbal rises to a predetermined height (difference), the first and second gimbals are lifted as a whole by a multi-stage plunger cylinder. The lowering process is the reverse of the rising process.

[0038] This invention, by directly setting a blind hole and a support rod at the outer end of the innermost central piston rod in a mature plunger cylinder structure, ensures that the height difference between the two antennas is maintained during the raising process by using a separately set support rod. Furthermore, the mature plunger cylinder structure operates smoothly, is easier to maintain, and will not experience situations where it cannot retract due to malfunction.

[0039] The above description is only 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 protection scope of the present invention.

Claims

1. An antenna lifting mechanism for an emergency communication vehicle, comprising a multi-stage piston cylinder, characterized in that, The multi-stage plunger cylinder includes a cylinder barrel (1), within which at least two intermediate piston sleeves (2) are sequentially fitted, and a central piston rod (3) is fitted within the innermost intermediate piston sleeve (2). The outer end of the central piston rod (3) has a coaxially arranged blind hole, within which a support rod (4) is telescopically fitted. The support rod (4) has a transmission thread, the outer diameter of which is the same as the inner diameter of the blind hole. A first gimbal plate (5) for mounting a first antenna is coaxially mounted on the outer end of the central piston rod (3), and a second gimbal plate for mounting a second antenna is fixedly mounted on the outer end of the support rod (4). A drive nut (6) fitted with the transmission thread is sleeved on the support rod (4), and the drive nut (6) is rotatably mounted on the first gimbal plate (5). The first gimbal plate (5) also has a mechanism for driving the drive nut (6). A rotating drive mechanism (7); the support rod (4) has a guide groove (42) arranged along the length direction, and the guide groove (42) passes through the corresponding transmission thread along the axial direction of the support rod (4); a limiting seat (8) is fixedly installed on the first gimbal plate (5), and the limiting seat (8) has a guide block (81) that cooperates with the guide groove (42); the length of the guide block (81) is greater than the lead of the transmission thread; the two ends of the guide block (81) extend in opposite directions to form guide portions, and the thickness of the guide portions gradually decreases in the direction away from the guide block (81); the drive mechanism (7) is used to drive the drive nut (6) to rotate so that the support rod (4) extends along the blind hole and drives the second gimbal plate to be lifted relative to the first gimbal plate (5) to a preset height; the multi-stage plunger cylinder is used to drive the first gimbal plate (5) and the second gimbal plate to be lifted as a whole.

2. The emergency communication vehicle antenna lifting mechanism as described in claim 1, characterized in that, The limiting seat (8) is a flange seat sleeved on the support rod (4). The flange seat has a guide hole that matches the diameter of the support rod (4). The guide block (81) is formed protrudingly in the guide hole. The flange seat is fixedly installed on the first gimbal plate (5) by bolts. The drive nut (6) is rotatably disposed between the first gimbal plate (5) and the flange seat.

3. The emergency communication vehicle antenna lifting mechanism as described in claim 2, characterized in that, The drive nut (6) includes a cylindrical nut body with a gear disk that protrudes radially in the middle of the nut body. The drive mechanism (7) includes a drive motor (71) mounted from bottom to top on the first gimbal plate (5). The output shaft of the drive motor (71) passes through the first gimbal plate (5) and is fitted with a pinion (72) that meshes with the gear disk. The diameter of the pinion (72) is smaller than the diameter of the gear disk.

4. The emergency communication vehicle antenna lifting mechanism as described in claim 3, characterized in that, The lower end of the nut body is equipped with a radial thrust bearing, and the first gimbal plate (5) has a first bearing hole corresponding to the radial thrust bearing. The radial thrust bearing is installed in the first bearing hole.

5. The emergency communication vehicle antenna lifting mechanism as described in claim 4, characterized in that, A ball bearing is installed at the upper end of the nut body, and a second bearing hole corresponding to the ball bearing is provided on the flange seat, and the ball bearing is installed in the second bearing hole.

6. The emergency communication vehicle antenna lifting mechanism as described in claim 5, characterized in that, The flange seat has a protruding support block at its bottom, which is distributed around the circumference of the gear disk and abuts against the first gimbal plate (5).

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