Precision pointing platform based on flexible parallelogram mechanism

Abstract

The invention relates to a precision pointing platform based on a flexible parallelogram mechanism, belongs to the field of the precision pointing platform, and solves the problems that the existing precision flexible pointing platform lacks an effective pointing motion guiding mechanism, so that the rotation center of an output platform of the precision flexible pointing platform drifts, and a driver does not effectively isolate harmful lateral motions. The precision pointing platform based on the flexible parallelogram mechanism provided by the invention comprises a base assembly, an outputplatform assembly, an outer sleeve, a parallelogram rotation guide mechanism, an adapter assembly, a piezoelectric ceramic driver and a pretightening assembly. The precision pointing platform providedby the invention adopts the flexible parallelogram mechanism for rotary guidance, the input end is provided with a convex circular contact table, and the output platform is provided with a fixing rotation center. According to the invention, the rotation center of the output platform does not drift, so that stable pointing precision is ensured; and the convex circular contact table which is arranged at the input end can reduce the adverse effects 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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