A large target suspension device

Abstract

The application discloses a novel hoisting and erecting device for large targets, which comprises a main rotating table, planet rotating tables, a sling and guide rails, the main rotating table is installed on a roof, three planet rotating tables are arranged, and the three planet rotating tables are installed on the guide rails arranged at the bottom of the main rotating table, and the planet rotating tables can be adjusted in position at the bottom of the main rotating table along the guide rails; each planet rotating table corresponds to a guide rail, and the three guide rails corresponding to the three planet rotating tables are distributed in a T shape; the bottom of each planet rotating table is installed with three sets of servo rollers, one sling is wound on each set of servo rollers, and the vertical stretching and contraction of the sling is controlled by the servo rollers; the three slings at the bottom of each planet rotating table are connected to the same hoisting point on the hoisted target; the novel hoisting and erecting device for large targets can be compatible with various models, the sling scattering is small, the stability is higher than that of a traditional hoisting and erecting device, and the azimuth, pitch and roll control of the target can be realized.

Description

Technical Field

[0001] This invention relates to the field of aircraft inspection technology, and in particular to a sling-mounting device for large targets. Background Technology

[0002] When performing RCS detection on a target in a microwave field, it needs to be erected at a certain height to avoid interference from ground scattering. Large targets weighing tens of tons need to be erected at heights of several meters to tens of meters or even higher, and the target must also undergo specified attitude changes. Therefore, target erection technology is highly challenging and is one of the key technologies in RCS detection.

[0003] The existing erection technologies include the following:

[0004] The foam column setup involved using five foam columns to support the target in the field. However, the target was simply placed on the foam columns and could not be mechanically connected to them. Therefore, the foam column setup only allowed the target to rotate horizontally, not to pitch or roll. Furthermore, complex coupling scattering could occur between the multiple foam columns.

[0005] The suspended erection method involves a horizontal cable stretched between two iron towers, with three suspension ropes hanging down from the middle of the cable, suspending the target at three triangularly distributed lifting points. Since the target has only one connection point on the horizontal cable, only the target's height can be adjusted, not its angles. Therefore, several suspension ropes extend towards the ground to control the target's attitude. Compared to the foam column erection method described above, the suspended erection method has the advantage of allowing adjustment of the target's pitch and roll angles, although the adjustment precision is not very high.

[0006] The three-support setup utilizes three support rods to support the target. The support rods are mechanically hinged to the target, allowing angular movement between them. Compared to the suspended setup described above, the three-support setup offers higher accuracy in attitude angle control. However, to ensure load-bearing capacity, resistance to instability, and sufficient safety, the support rods in the three-support method must be made of metal, and their cross-sectional dimensions cannot be too small, resulting in stronger beam dispersion. Furthermore, the three support rods obstruct some areas of the target's underside to varying degrees.

[0007] The two-support-one-suspension setup utilizes two support rods on a ground-based turntable indoors to support the target, while a high-transmittance rope suspends the target from the ceiling of the darkroom via a suspension point. The vertical movement of the suspension point achieves the target's pitch, while the rotation of the ground-based turntable achieves the target's azimuth. However, it suffers from the same shortcomings as the three-support setup. Furthermore, the current two-support-one-suspension system only allows for forward pitch adjustment and cannot perform lateral roll adjustment, resulting in poor compatibility. Summary of the Invention

[0008] The purpose of this invention is to provide a large target hoisting and erection device to solve the problems existing in the prior art. It is compatible with multiple models, has low sling scattering, and has higher stability and controllability than traditional hoisting and erection methods. It can realize the target's azimuth, pitch, and roll control.

[0009] To achieve the above objectives, the present invention provides the following solution:

[0010] This invention provides a large target hoisting and erection device, including a main turntable, planetary turntables, slings, and guide rails. The main turntable is installed on the roof and can rotate relative to the roof. Three planetary turntables are provided and mounted on guide rails at the bottom of the main turntable. The planetary turntables can be adjusted along the guide rails to their position at the bottom of the main turntable and can also rotate relative to the main turntable. Each planetary turntable has three sets of servo rollers at its bottom, and a sling is wound around each set of servo rollers. The vertical extension and retraction of the sling is controlled by the servo rollers. The target is suspended from the bottom of the planetary turntables, and the target has three lifting points corresponding to the three planetary turntables. The three slings at the bottom of each planetary turntable are connected to the corresponding lifting points on the target.

[0011] Preferably, the main turntable is controlled to rotate by a main motor, which is mounted on a beam in the roof.

[0012] Preferably, the planetary turntable is controlled to rotate by a planetary motor, and a slider is mounted on the planetary motor, the slider being slidably connected within the guide rail.

[0013] Preferably, each planetary turntable corresponds to one guide rail, and the three guide rails corresponding to the three planetary turntables are distributed in a T-shape.

[0014] Preferably, the three planetary turntables are arranged in an isosceles triangle at the bottom of the main turntable.

[0015] Preferably, the three lifting points on the suspended target are on the same vertical line as the centers of the three planetary turntables.

[0016] Preferably, when the main turntable rotates in orientation, each of the planetary turntables rotates in the opposite direction at the same speed.

[0017] The present invention achieves the following beneficial technical effects compared to the prior art:

[0018] 1. The large target hoisting and erection device provided by this invention is compatible with multiple machine models.

[0019] Each planetary turntable corresponds to one of the three lifting points on the target. By adjusting the positions of the three planetary turntables on the main turntable, the different lifting point positions of different models can be accommodated. Increasing the diameter of the main turntable can further expand the adjustment range.

[0020] The large target hoisting device provided by this invention features minimal scattering from the sling. The sling is designed to be made of ultra-high molecular weight polyethylene (UHMWPE), whose relative permittivity is higher than that of polyurethane or polystyrene foam used to manufacture foam columns. However, because the cross-sectional dimensions and surface area of ​​the sling are much smaller than those of a foam column with the same load-bearing capacity, the RCS (Radar Cross Section) generated by the sling is significantly smaller. Experiments also show that the rope diameter has a significant impact on the RCS. When the rope diameter is reduced to 5 mm, a mere 2-degree inclination angle causes the rope's RCS to be completely submerged by the background. Therefore, precisely selecting the rope diameter based on the actual load can further reduce the scattering of the sling.

[0021] The large target sling erection device provided by this invention offers higher stability and controllability than traditional sling erection methods. The slings of this invention have virtually no self-weight sag, with a total of nine slings suspending the target at three points, enhancing sling rigidity and stability compared to traditional methods. The sling erection of this invention is essentially a 9-3 type parallel mechanism with flexible branches, achieving millimeter-level precision through kinematic algorithms, laser pose monitoring, and multi-axis computer control.

[0022] The large target hoisting and erection device provided by this invention can realize azimuth, pitch, and roll control. Due to the flexibility of the 9-3 type parallel mechanism control, multi-axis linkage attitude control can be performed, and RCS detection can be achieved under any pitch-roll angle combination.

[0023] The large target hoisting device provided by this invention has minimal obstruction; the wave-transparent sling obstructs the target far less than the support rod, especially since there is no obstruction on the belly of the target, which is beneficial for accurate measurement of the RCS at the bottom of the target.

[0024] The large target hoisting device provided by this invention requires a smaller static area than the two-support-one-lift method; the hoisting point of the two-support-one-lift method must be at the center of the turntable, the target has a large rotation radius, and a larger static area size is required; while the 9-3 type sling hoisting method can design the static area size according to the target's circumcircle.

[0025] 7. The large target hoisting device provided by this invention has a large safety redundancy; it has a total of 9 slings suspending the target at three lifting points, which enhances the hoisting rigidity compared with traditional hoisting methods. At the same time, even if one sling completely breaks, the target will not fall immediately, thus improving the system's safety redundancy. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the hoisting and erecting device for large targets in this invention;

[0028] Figure 2 This is a partial structural diagram of the bottom of the main turntable in this invention;

[0029] Figure 3 This is a schematic diagram of the guide rail distribution at the bottom of the main turntable in this invention;

[0030] In the diagram: 1-Main turntable, 2-Planetary turntable, 3-Sling, 4-Guide rail, 5-Suspended target, 6-Servo roller. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] The purpose of this invention is to provide a sling-mounting device for large targets to solve the problems existing in the prior art.

[0033] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] The large target hoisting and erection device in this embodiment, such as Figure 1-3As shown, the system includes a main turntable 1, planetary turntables 2, slings 3, and guide rails 4. The main turntable 1 is installed on the roof and can rotate relative to the roof. There are three planetary turntables 2, and the three planetary turntables 2 are installed on the guide rails 4 at the bottom of the main turntable 1. The position of the planetary turntables 2 at the bottom of the main turntable 1 can be adjusted along the guide rails 4, and the planetary turntables 2 can also rotate relative to the main turntable 1. Each planetary turntable 2 corresponds to one guide rail 4, and the three guide rails 4 corresponding to the three planetary turntables 2 are distributed in a T-shape. Three sets of servo rollers 6 are installed at the bottom of each planetary turntable 2, and a sling 3 is wound on each set of servo rollers 6. The vertical extension and retraction of the sling 3 is controlled by the servo rollers 6. The suspended target 5 is suspended at the bottom of the planetary turntables 2, and the suspended target 5 has three suspension points that are respectively opposite to the three planetary turntables 2. The three slings 3 at the bottom of each planetary turntable 2 are connected to the corresponding suspension points on the suspended target 5.

[0035] In this specific embodiment, the main turntable 1 is controlled to rotate by a main motor, which is mounted on a beam in the roof. The planetary turntable 2 is controlled to rotate by a planetary motor, on which a slider is mounted and slidably connected within a guide rail 4.

[0036] In this specific embodiment, the three planetary turntables 2 are arranged in an isosceles triangle at the bottom of the main turntable 1, and the three suspension points on the target 5 are respectively on the same vertical line as the centers of the three planetary turntables 2. The three suspension cables 3 on each planetary turntable 2 suspend one point on the target 5, so that the angle between the suspension cable 3 and the wavefront is greater than 10 degrees, so as to significantly reduce the microwave scattering of the suspension cable 3.

[0037] In this specific embodiment, when the main turntable 1 rotates in azimuth, each planetary turntable 2 rotates in the opposite direction at the same speed to ensure that the angle between each sling 3 and the wavefront remains unchanged.

[0038] In this embodiment, when performing RCS detection on the target, it needs to be detected at different pitch and roll angles in a 360-degree azimuth, that is, it needs three rotational degrees of freedom: azimuth, pitch, and roll. A wave-transparent sling 3 is used to suspend the target at three points on the fuselage and wing. The extension and retraction of the sling 3 drives the raising and lowering of the corresponding sling points, enabling pitch and roll operations on the target. The rotation of the main turntable 1 allows for 360-degree azimuth rotation of the target.

[0039] This invention has illustrated its principles and implementation methods using specific examples. The descriptions of these embodiments are merely illustrative of the method and its core ideas; furthermore, those skilled in the art will recognize that modifications may be made to the specific implementation methods and application scope based on the principles of this invention. Therefore, the content of this specification should not be construed as limiting the invention.

Claims

1. A large object suspension erecting apparatus characterized by comprising: The application relates to a rotating device for hanging targets, which comprises a main rotating table, planet rotating tables, hanging ropes and guide rails, wherein the main rotating table is installed on a roof and can rotate relative to the roof; three planet rotating tables are arranged and installed on guide rails arranged at the bottom of the main rotating table, the position of the planet rotating tables at the bottom of the main rotating table can be adjusted along the guide rails, and the planet rotating tables can rotate relative to the main rotating table; three sets of servo rollers are installed at the bottom of each planet rotating table, one hanging rope is wound on each set of servo rollers, and the vertical stretching and contraction of the hanging rope is controlled by the servo rollers; a hanging target is hung at the bottom of the planet rotating table, and the hanging target is provided with three hanging points corresponding to the three planet rotating tables; three hanging ropes at the bottom of each planet rotating table are connected to the corresponding same hanging point on the hanging target to form a 9-3 parallel mechanism; each planet rotating table corresponds to one guide rail, and the three guide rails corresponding to the three planet rotating tables are distributed in a T shape; the three planet rotating tables are distributed in an isosceles triangle shape at the bottom of the main rotating table; the three hanging points on the hanging target and the centers of the three planet rotating tables are located on the same vertical line; and the planet rotating tables rotate at the same speed in the opposite direction when the main rotating table rotates.

2. The large target suspension erecting device according to claim 1, characterized by: The main rotating table is controlled to rotate by a main motor, and the main motor is installed on a beam of the roof.

3. The large target suspension erecting device according to claim 1, characterized by: The planet rotating tables are controlled to rotate by planet motors, and the planet motors are provided with sliding blocks which are slidingly connected in the guide rails.

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