Comprehensive protector for crane

Abstract

The present invention discloses a comprehensive protector for a crane, wherein the comprehensive protector comprises a lifting motor main circuit and a control circuit. According to the comprehensive protector of the present invention, normally closed contacts PZ1 and PZ2 of relays JZ1 and JZ2 are respectively connected with a lifting control circuit and a lowering control circuit of a cam controller in series; a rotation encoder BMQ is arranged on a main shaft of a lifting motor M; a position sensor is installed on the cam controller of the crane; signals of the rotation encoder BMQ and the position sensor are input into a PLC controller; and the PLC controller controls action of the relay JZ1 or JZ2 through signal acquisition and data processing to enable the lifting motor M and a brake YA to be subjected to power-down. With the present invention, high environment adaptability and system stability can be obtained so as to ensure long term stable and excellent running; lifting distance limitation protection function, crane overspeed protection function, braking slipping distance detection function and load learning function are provided, and load upper limitation parameters are automatically set.

Description

(1) Technical field [0001] The invention belongs to a crane protection device, in particular to a comprehensive protection system for a bridge crane. (2) Background technology [0002] The existing crane safety protection device includes a limiter for rising limit position, an overspeed protection device and a limiter for lifting capacity. The rising limit position limiter generally has a hammer type rising limit position limiter and a screw type upper limit limiter. When the boom rises to the limit position, the contact moves and the circuit is disconnected, so that the lifting mechanism no longer moves upward. Start in the upward direction. This mechanical upper limit device can only function at the limit position, and cannot perceive the actual position of the spreader when the spreader is running within a limited range, and this structure may make mistakes in actual work. Therefore, the current safety technical regulations require that metallurgical cranes must be equi...

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide a comprehensive protector for cranes to overcome the shortcomings of the existing protection devices such as single function, large space occupation and high failure rate

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