Safety protection method and system of gantry crane

Abstract

The invention relates to a safety protection method of a gantry crane, strain sensors are at least arranged in five positions including the center on a load-bearing gantry girder, two positions between the center and two ends and vertical supporting positions at two ends of the lower end of a horizontal arm, strain signals outputted by the strain sensors correspond to strain born in the five positions, strain values of the strain sensors in the five positions output the acquired strain signals in a real-time manner, and the strain signals are converted to the strain by data conversion. When the strain signal epsilon outputted by the strain sensor which corresponds to the strain is not less than a certain fixed value 1, a system plays the role of limiting dynamic load; when the strain signal epsilon outputted by the strain sensor which corresponds to the strain is not less than a certain fixed value 2 and the fixed value 2 is larger than the certain fixed value 1, the system limits the motion of the crane; when the strain signal epsilon outputted by the strain sensor which corresponds to the strain is not less than a certain fixed value 3, a protection action actuating mechanism limits actions of the crane or stops the actions of the crane according to a safety protection control signal.

Description

technical field [0001] The invention relates to a crane safety protection method and system, in particular to a gantry crane safety protection method and system. Background technique [0002] CN200810212121.7 discloses a crane safety protection system, including several sensors, controllers and protective action actuators; the sensors detect the working status of the crane in real time and transmit it to the controller; according to the detection data of the sensors, the controller calculates the current working status Below, the maximum allowable load determined by each characteristic of the crane; compare the above-mentioned maximum allowable load related to each characteristic of the crane, take the minimum value and take the predetermined design margin, and obtain the rated working load G rated; according to the sensor data, calculate the current The actual hoisting weight; compare the actual hoisting weight with the rated working load, if it exceeds the preset safety ra...

AI Technical Summary

Problems solved by technology

[0004] The structure of a large gantry crane (crane) is composed of a main beam and two outriggers. The overall structure is similar to the door type. Its own weight, plus the possible dynamic load in the working state, its load can often exceed the rated value. The traditional The crane safety protection method is limited to the load limit and speed limit, which cannot realize reliable protection function for the gantry crane

In the event of overloading or other additional load situations for various reasons, accidents frequently occur, often with catastrophic results

The 1 / 4 position of the arm length of the cantilever of the gantry crane and a certain support point of the support are also greatly stressed, which may cause danger

In particular, the gantry crane is a dynamic process in the process of lifting workpieces. The process of acceleration and deceleration often produces additional momentum, and the result of additional stress is more dangerous.

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