Protection switch for heavy current power limitation quick action

Abstract

The invention relates to a protection switch for heavy current power limitation quick action, which is especially used for protection of a main circuit as well as has large rated operational current and high reliability. The protection switch comprises: a box (1), which is equipped with a cover; a force failure detection mechanism (2); a conversion energy storage mechanism (3); a contact system, which is composed of a plurality of contact mechanisms (4); and a main shaft (5). According to the invention, a heavy object hung at the force failure detection mechanism (2) is utilized to carry out limitation on a limitation position of a motor; the conversion energy storage mechanism (3) rapidly drives the main shaft (5) to make rotation; each the contact mechanism (4) in the contact system is utilized to ensure rapid and reliable conversion of circuits; and protection is directly formed in a main circuit; the rated operational current is capable of reaching 1,000 A. Beneficial effects of the invention are as follows: the design is reasonable; the structure is simple; the main circuit can be directly protected; circuit conversion has high reliability; on-off performance is good; and the rated operational current is heavy; therefore, the protection switch can be applied in a high temperature environment.

Description

Technical field [0001] The invention relates to a protection switch for lifting equipment, in particular to a high-current power limit quick-action protection switch. Background technique [0002] At present, in the safety protection of various types of hoisting machinery, limit switches are adopted to control their travel, and limit protection is mainly carried out through the secondary control circuit, which is only used for the protection of the control circuit, so direct protection of the main circuit cannot be realized. Moreover, the safety factor of one more circuit will inevitably be reduced. Once the protection circuit fails, it will have serious consequences. The limit switch is an electrical appliance that switches the control circuit according to the stroke position of the moving part. Its function principle is similar to that of a button. It can be installed on a relatively stationary object (referred to as a still life, such as a fixed frame, a door frame, etc.), or ...

AI Technical Summary

Problems solved by technology

The existing cam limit switch, through a gear transmission device, changes the rotation of the reel into the rotation of the cam disc; the limit switch of the crane is mainly used for AC 50-60Hz rated voltage 380 volts, DC rated working voltage 220 volts In the control circuit of the crane, it is used to limit the working angle of the crane's rotary motion mechanism and perform sequential control; there is also a laser position detection protection currently used, which requires loop support, and cannot be directly applied to the protection of the main circuit and the protection of the high-current circuit. Among them, for example, the related products of foreign Schneider and ABB companies have a rated current of no more than 16A, and they are only used for the protection of the control circuit, and cannot directly protect the main circuit.

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