Constant force supporting mechanism based on flexible Sarrus mechanism

Abstract

The invention belongs to the field of flexible mechanisms, and particularly relates to a constant force supporting mechanism based on a flexible Sarrus mechanism. The constant force supporting mechanism is characterized by comprising at least six rigid rods and hinges connected with the at least six rigid rods, wherein the at least six rigid rods are in rigid articulation through the hinges to form a spatial six-rod single-degree-of-freedom mechanism; the at least six rigid rods are namely the first rod piece, the second rod piece, the third rod piece, the fourth rod piece, the fifth rod piece and the sixth rod piece; the second rod piece is connected with the third rod piece through the third crossed spring piece type flexible hinge; the third rod piece is connected with the fourth rod piece through the fourth crossed spring piece type flexible hinge; the fourth rod piece is connected with the fifth rod piece through the fifth crossed spring piece type flexible hinge; and the fifth rod piece is connected with the sixth rod piece through the sixth crossed spring piece type flexible hinge. According to the constant force supporting mechanism based on the flexible Sarrus mechanism, the structure is simple, the carrying is convenient, the stability is good, the reliability is high, and therefore the constant force supporting mechanism is applicable to places and fields in which the output of a constant force is needed, for example, realizing a constant force in fitness equipment and providing an auxiliary body support in medical surgical operation processes.

Description

technical field [0001] The invention belongs to the field of flexible mechanisms, and relates to a constant force support mechanism based on a flexible Sarrus mechanism, which can be used in many occasions requiring constant force support, such as mechanical products in the fields of medical treatment, household appliances, transportation, construction, metallurgy and the like. Background technique [0002] Within a certain range of motion, the reaction force generated at the output end of the constant force mechanism is always maintained at a certain value or fluctuates around a certain value. Because the constant force mechanism does not satisfy Hooke's law, it is essentially different from traditional cylindrical springs or other elastic bodies. It has broad application prospects in many fields and occasions such as machinery, nuclear industry, national defense, instrumentation, etc., such as objects Clamping, pipe cleaning, thermal power generation, artillery automaton, ...

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Problems solved by technology

[0003] Limited by the complexity and weight of the mechanism, the current constant force mechanism is mostly used in engineering fields such as hangers and brackets, but is rarely used in the field of life. The patent number is CN201610003886.4 Chinese patent discloses a constant force adjustable mechanism, which has a simple structure and high reliability, but it can provide a small constant force working range, which cannot meet the constant force output occasions that require a large range of motion, such as medical devices for patients with lower limb injuries, patent CN 2128879Y, CN 2885222Y, etc., and the patient can only lie down or sit when using it, which greatly reduces the convenience, comfort and initiative of rehabilitation activities; another example is the support mechanism of common computer monitor supports or large electronic display screens, realized in CN 101178944A A movable support is adopted, but the structure is complicated and the production cost is high

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