A precision pointing platform based on flexible parallelogram mechanism

Abstract

The invention relates to a precision pointing platform based on a flexible parallelogram mechanism, which belongs to the field of precision pointing platforms, and solves the problem that the existing precision flexible pointing platform lacks an effective guiding mechanism for pointing motion, which causes the rotation center of the output platform to drift and the driver to be out of alignment. The problem of effective isolation of unwanted lateral motion. The precision pointing platform based on the flexible parallelogram mechanism of the present invention includes: a base assembly, an output platform assembly, an outer sleeve, a parallelogram rotating guide mechanism, an adapter assembly, a piezoelectric ceramic driver and a preload assembly. The precision pointing platform of the present invention adopts a flexible parallelogram mechanism for rotation guidance, and the input end is provided with a convex contact platform, and the output platform has a fixed rotation center. The invention realizes that the rotation center of the output platform does not drift, thereby ensuring stable pointing accuracy, and the convex contact table is arranged at the input end to reduce the adverse influence of lateral load on the piezoelectric ceramic driver.

Description

technical field [0001] The invention relates to the field of precision pointing, in particular to a precision pointing platform based on a flexible parallelogram mechanism. Background technique [0002] The precision pointing platform is widely used in space laser communication, precision capture, aiming and tracking, terrestrial astronomical observation and astronomical telescopes, etc., to realize small-scale, fast and precise pointing and positioning of carrying equipment. The mechanism design of the pointing platform can adopt two design methods: rigid mechanism and compliant mechanism. The kinematic joints of rigid pointing platforms are mostly traditional rigid kinematic pairs, such as gears, bearings, Hooke hinges, spherical joints, etc., which are mostly used in large-angle deflection occasions, such as antenna pointing mechanisms, weapon system fire control, reconnaissance platforms, etc. However, there are inherent nonlinear problems such as friction and backlash ...

AI Technical Summary

Problems solved by technology

[0005] However, the existing precision flexible pointing platforms mostly use simple multi-axis hinge joints (such as omnidirectional notch hinges or series reed hinges) for their flexible support structures, and the rotation guidance of pointing motion only depends on the elongation or extension of the control driver. Shorten the implementation, the output platform pointing to the platform can experience unwanted axial and lateral parasitic motion

The reason for this is that the output platform pointing to the platform lacks a fixed center of rotation, which will drift due to changes in the drive input

In addition, since the piezoelectric ceramic driver is directly connected to the multi-axis hinge joint, as the rotation angle of the output platform increases, the lateral force of the driver will become larger and larger, and it will easily exceed its lateral shear force limit, causing damage to the driver. destroy

In the final analysis, the existing precision flexible pointing platform lacks an effective pointing motion guiding mechanism, resulting in the drift of the rotation center of the output platform, and the driver does not effectively isolate the harmful lateral motion

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