Coupled four-freedom-degree parallel connection vibration isolation platform

Abstract

A coupled four-freedom-degree parallel connection vibration isolation platform mainly comprises an upper platform, a lower platform, four main part branches and a middle constraint branch, wherein the four main part branches are identical in structure and used for connecting the upper platform and the lower platform. The tails of actuators of the main part branches are connected with the lower platform through universal joints, telescopic rods of the actuators are connected with the upper platform through ball joints, one end of a lower connecting rod in the middle constraint branch is connected with the lower platform through a universal joint, the other end of the lower connecting rod is connected with an upper connecting rod in a bell socket mode to form a sliding pair, namely the upper connecting rod can expand and retract in the lower connecting rod, the upper connecting rod of the sliding pair is sleeved with a spring, the other end of the upper connecting rod is connected with the upper platform through a rotating pair, and the axis of the rotating pair is parallel to one axis of the universal joint in the middle constraint branch. Lower hinge points of the four main part branches are symmetrically arranged in a square shape, upper hinge points are arranged in a trapezoid shape, and the trapezoid is symmetrical about the axis of a rotating pair of the middle constraint branch. The coupled four-freedom-degree parallel connection vibration isolation platform is simple in structure, large in bearing capacity and good in dynamic response characteristic.

Description

technical field [0001] The invention relates to a parallel mechanism, in particular to a vibration isolation platform. Background technique [0002] Multidimensional vibration is a universal phenomenon. During the movement of ships or vehicles, multi-dimensional vibrations will be generated due to external environmental factors. The main motion forms are up and down translation vibration, pitch rotation vibration, roll rotation vibration and translation vibration in the forward direction. Multi-dimensional vibrations adversely affect personnel and equipment, causing a variety of different damages. For example, the multi-dimensional vibration of an ambulance will aggravate the suffering of patients, and the multi-dimensional vibration of a ship will affect the precision of its precision equipment and reduce the service life of the equipment. Therefore, the multi-dimensional vibration isolation platform is of great significance to reduce the vibration of the ambulance bed, ...

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Problems solved by technology

Patents 02137859.2, 02137858.4, and 02137856.8 all propose a parallel mechanism with two-dimensional translation and two-position rotation. This mechanism has a simple structure and a large working space; these mechanisms also have strict requirements on positional relationships and are not easy to process and assemble.

Patent ZL200420102722.X proposes a parallel mechanism with two-dimensional movement and two-dimensional rotation. This mechanism has simple structure, good rigidity, easy control, and good dynamic performance; Mechanism movement is easy to realize crawling

Patent CN200620056937.1 proposes a parallel mechanism with two-dimensional movement and two-dimensional rotation. The mechanism is composed of four identical branches and one RPU constrained branch. Since the universal hinge of the constrained branch of the mechanism is on the moving platform, the mechanism is It cannot produce large coupling movement while rotating, and cannot meet the vibration isolation requirements of vehicles and ships

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