Heavy-duty radar vehicle leveling device based on planetary roller screw pair

Abstract

According to the heavy-load radar vehicle leveling device, the transmission mode that the large-torque hydraulic motor drives the planetary roller lead screw pair is adopted, and due to the fact that the bearing capacity of the planetary roller lead screw pair is increased by more than two times compared with that of a ball screw, the size and the weight of the leveling device are both greatly reduced, and the use requirement of vehicle-mounted equipment is met. The stroke of the leveling device is 350 mm, the dynamic load is 65 tons, the static load is 125 tons, the weight is 380 kg, and the weight is reduced by more than 35% under the same index. And the leveling device adopts a force sensor, so that the grounding and load conditions of the leveling device can be monitored in real time in the leveling process, the conditions of virtual legs and platform torsion are avoided, the load can be monitored in the long-term working process of the radar vehicle, and the safety of the radar is greatly improved.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical structures, and particularly relates to a leveling device for a heavy-duty radar vehicle based on a planetary roller screw pair. Background Art

[0002] To meet the mobility requirements, the antenna of an extra-large radar needs to be segmented. During transportation, it is distributed on multiple transportation units, and when working, the antenna is assembled into a whole on the main vehicle. At this time, the total weight of the antenna, the main vehicle, and other equipment has exceeded one hundred tons, posing extremely high requirements for indicators such as the self-weight, dynamic load, static load, maintenance of leveling accuracy, uniform distribution of the load after leveling, and monitoring of the leveling device.

[0003] Existing leveling devices generally use screws or hydraulic cylinders to transmit motion and power. Screws have two forms: trapezoidal screws and ball screws. When a trapezoidal screw moves, it has sliding friction and is easy to self-lock, but the friction resistance is large and the transmission efficiency is low, which is suitable for leveling systems within thirty tons; when a ball screw moves, it has rolling friction, and the load is transmitted from the nut to the screw through steel balls. The load-bearing capacity depends on the diameter of the steel balls and the number of contact points, which is suitable for leveling systems within fifty tons. When the load exceeds one hundred tons, the diameters of the steel balls and the nut will be very large, and the size and self-weight of the leveling device cannot meet the requirements; the expansion sleeve hydraulic cylinder realizes locking at any position through the interference fit between the locking sleeve and the cylinder barrel. The locking force depends on the contact area of the locking sleeve, which is suitable for leveling systems of about fifty tons. When the load exceeds one hundred tons, it is necessary to increase the cylinder barrel diameter or the axial length, resulting in a multiple increase in the weight of the hydraulic cylinder and not meeting the usage requirements. The leveling device is installed on the main vehicle. Due to the limitations of indicators such as load-bearing capacity, self-weight, and self-locking performance, the current transmission forms cannot meet the usage requirements. Summary of the Invention

[0004] To solve the deficiencies in the prior art, the present invention proposes a heavy-duty and lightweight radar vehicle leveling device with strong load-bearing capacity, light self-weight, long service life, which can realize automatic leveling of an extra-large radar vehicle and meet the requirements of mobile transportation.

[0005] A leveling device for a heavy-duty radar vehicle based on a planetary roller screw pair of the present invention mainly consists of a hydraulic motor (1), a bearing seat (2), a spherical roller thrust bearing (3), an upper limit switch (4), a planetary roller screw pair (5), an outer sleeve (6), a lower limit switch (7), an inner sleeve (8), a split force sensor (9), a ball hinge (10), a base (11), etc. The present invention uses a planetary roller screw pair (5) as a transmission element. The roller tooth profile of the planetary roller screw pair (5) is an arc convex tooth profile with a relatively large radius of curvature, and multiple rollers simultaneously participate in transmitting the load. Under the same specification conditions, the load-bearing capacity is more than 3 times that of a ball screw.

[0006] The planetary ball screw pair (5) is installed at the center of the leveling device. Its upper end is connected to the high-torque hydraulic motor (1) through an internal spline to transmit torque and motion. It is connected to the outer sleeve (6) through a double-direction thrust self-aligning roller bearing (3) and a bearing seat (2). The high-torque hydraulic motor (1) directly drives the planetary roller screw pair (5) to achieve the telescopic motion of the leveling device. The nut of the planetary ball screw pair (5) is connected to the inner sleeve (8) by bolts to convert the rotational motion of the hydraulic motor (1) into the linear motion of the inner sleeve (8). The ball hinge (10) and the base (11) are installed at the lower end of the planetary ball screw pair (5) to achieve leveling support under a large slope. The hydraulic motor (1) is equipped with a brake to ensure position locking at rest. The hydraulic motor (1) is equipped with a pulse encoder to detect the telescopic speed of the leveling device. The upper limit switch (4) and the lower limit switch (7) are installed on the outer sleeve (6). By sensing the position of the nut of the planetary ball screw pair (5), automatic limit is achieved during the leveling process. The split-type force sensor (9) adopts a split design to measure the load of the leveling device. Its upper end is connected to the main vehicle platform, and its lower end is fixedly connected to the leveling device without increasing the axial length of the leveling device.

[0007] The hydraulic motor (1) directly drives the planetary roller screw pair (5) to rotate, driving the inner sleeve (8) fixed to the nut to move linearly along the outer sleeve (6). The axial force of the leveling device is borne by the planetary roller screw pair (5), and the bending moment is borne by the inner and outer sleeves of the leveling device. The screw is not subject to other forces except the axial force. The inner and outer sleeves are made of alloy steel with surface carburizing and quenching to meet the strength requirements. The clearance between the inner and outer cylinders of the leveling device is 0.08 mm, providing good guidance during the axial movement of the screw pair.

[0008] To ensure that the stroke of the leveling device does not exceed the limit position, two limit switches are set on the outer sleeve to control the stroke of the leveling device. When the stroke exceeds the limit, the hydraulic motor (1) will automatically stop rotating.

[0009] The beneficial effects of the present invention are as follows

[0010] 1. Strong load-bearing capacity: The leveling device adopts a transmission method of a high-torque hydraulic motor driving a planetary roller screw pair. Since the load-bearing capacity of the planetary roller screw pair is more than twice that of the ball screw, the size and weight of the leveling device are significantly reduced, meeting the usage requirements of vehicle-mounted equipment. The stroke of the leveling device is 350 mm, the dynamic load is 65 tons, the static load is 125 tons, and the weight is 380 kg. Under the same indicators, the weight is reduced by more than 35%.

[0011] 2. Good safety: The leveling device is equipped with a force sensor, which can monitor the situation of the leveling device touching the ground and the load in real time during the leveling process, avoiding the occurrence of "hollow legs" and platform "twisting", and can monitor the load during the long-term operation of the radar vehicle, greatly improving the safety of the radar. Description of the Drawings

[0012] Figure 1 This is a schematic structural diagram of the leveling device of the present invention.

[0013] Figure 2 This is a schematic diagram of a split force sensor.

[0014] Figure 3 This is a schematic installation diagram of the leveling device.

[0015] The meanings of the reference numerals are as follows: 1 - hydraulic motor, 2 - bearing seat, 3 - spherical roller thrust bearing, 4 - upper limit switch, 5 - planetary roller screw pair, 6 - outer sleeve, 7 - lower limit switch, 8 - inner sleeve, 9 - split force sensor, 10 - ball hinge, 11 - base, 12 - main vehicle platform, 13 - anti-overturning device, 14 - leveling device. Specific Embodiments

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] As Figure 3 shown, a certain radar main antenna vehicle adopts the heavy-duty leveling device based on the planetary roller screw pair of the present invention. The total weight of the antenna vehicle is 130 tons, and it adopts the method of four-point leveling and four-point anti-overturning support. The upper end of the leveling device is connected to the carrier vehicle platform and the anti-overturning device by bolts through a split force sensor.

[0018] Because the leveling device has dual feedback of load and displacement, it can realize one-key leveling of the radar vehicle, with a leveling time of less than 100 seconds and a leveling accuracy better than ±3'. Because the leveling device itself is reliably self-locked by a brake, it can ensure that the leveling accuracy of the radar vehicle remains unchanged for a long time. Because a force sensor is designed and installed on the leveling device to effectively monitor the load of each leveling device and give an alarm signal when the load of the leveling device is less than the safe load, ensuring the safety of the radar vehicle in a strong wind working environment.

[0019] The present invention is not limited to the above specific embodiments, and the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made based on the technical essence of the present invention to the above embodiments shall be included in the protection scope of the present invention.

Claims

1. A heavy-duty radar vehicle leveling device based on a planetary roller screw pair, characterized in that: It includes a hydraulic motor, a bearing housing, a spherical roller thrust bearing, a planetary roller screw pair, an outer sleeve, an inner sleeve, a ball hinge, and a base; The planetary roller screw pair is installed at the center of the leveling device. The upper end is connected to the hydraulic motor through an internal spline to transmit torque and motion, and is connected to the outer sleeve through a double-direction spherical roller thrust bearing and a bearing housing; The hydraulic motor directly drives the planetary roller screw pair to achieve the telescopic motion of the leveling device; The nut of the planetary roller screw pair is connected to the inner sleeve through bolts to convert the rotational motion of the hydraulic motor into the linear motion of the inner sleeve; The ball hinge and the base are installed at the lower end of the planetary roller screw pair to achieve leveling support under a large slope; When the leveling device is working, the hydraulic motor directly drives the planetary roller screw pair to rotate, driving the inner sleeve fixed to the nut to move linearly along the outer sleeve; The axial force of the leveling device is borne by the planetary roller screw pair, and the bending moment is borne by the inner and outer sleeves of the leveling device. The screw is not subjected to other forces except the axial force.

2. The heavy-load radar vehicle leveling device based on a planetary roller screw pair according to claim 1, characterized in that: The hydraulic motor is equipped with a brake and a pulse encoder to ensure the position locking of the leveling device when it is static and to detect the telescopic speed of the leveling device.

3. The leveling device for a heavy-duty radar vehicle based on a planetary roller screw pair according to claim 1, characterized in that: It further includes an upper limit switch and a lower limit switch. The upper limit switch and the lower limit switch are installed on the outer sleeve. By sensing the position of the nut of the planetary roller screw pair, automatic limiting during the leveling process is achieved; When the stroke exceeds the limit, the hydraulic motor will automatically stop rotating.

4. The heavy-load radar vehicle leveling device based on a planetary roller screw pair according to claim 1, wherein: It further includes a split-type force sensor. The split-type force sensor measures the load of the leveling device in real time. The upper end is connected to the main vehicle platform, and the lower end is fixedly connected to the leveling device without increasing the axial length of the leveling device.

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