Electric actuator for actively adjusting main reflection face of large-size radio telescope

Abstract

The invention provides an electric actuator for actively adjusting a main reflection face of a large-size radio telescope. The electric actuator comprises a box body, a worm gear, a worm, an intelligent step motor, a screw nut, a ball screw, a cylinder guide sleeve, an upper guide sleeve, a supporting board, a supporting rod, a plastic bearing, a limiting stopper, a zero-position sensor, a screening box and an aviation socket, wherein the intelligent step motor is connected with the worm; the worm gear and the screw nut are fixed together; the ball screw is connected with the cylinder guide sleeve through a spline; the cylinder guide sleeve is fixedly arranged on the box body; the upper guide sleeve is fastened to and connected with the upper end of the ball screw; the supporting board is fixedly connected with the upper guide sleeve; the supporting rod is fixedly connected with the supporting board; the plastic bearing is sandwiched between the cylinder guide sleeve and the upper guide sleeve and is in interference fit with the upper guide sleeve; the limiting stopper is fixed at the lower end of the ball screw; the zero-position sensor is fixedly arranged on the box body and can be in contact with the limiting stopper; the screening box is fixedly arranged on the box body; and the aviation socket is connected with the screening box. The electric actuator provided by the invention has the advantages of high positioning precision, large power weight ratio, capability of bearing lateral force, water resistance and dust resistance, electromagnetic radiation resistance and high reliability and has a power supply-free self-locking function.

Description

Technical field [0001] The invention relates to a mechanical control device of a radio telescope, in particular to a special electric actuator used in an active adjustment system for the main reflecting surface of a large radio telescope, and belongs to the technical field of electromechanical engineering. Background technique [0002] Due to the influence of its own weight and wind load, the main reflecting surface of a large radio telescope will deviate from the standard parabolic shape, which will seriously reduce the efficiency of the radio telescope, and its high-frequency efficiency will even be attenuated by more than 5 times. In order to improve its high-frequency work efficiency, the main reflecting surface is divided into more than 1,000 pieces. Each reflecting surface is controlled by an electric actuator. The active movement of the electric actuator is used to compensate and correct the deformation of the entire main reflecting surface. This technology is called the a...

AI Technical Summary

Problems solved by technology

Since the existing electric actuators cannot fully meet the above requirements, it is necessary to develop a new type of electric actuator for active adjustment of the main reflector of large radio telescopes

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