Crane and moment limiter and its moment correction method and system

Abstract

The invention discloses a crane, a torque limiter as well as a torque correction method and system. Because the weight and gravity center of an auxiliary arm are fixed values, the initial state of the auxiliary arm is firstly set according to the common state of the auxiliary arm of the crane, and then, the torque of the auxiliary arm in the initial state is calibrated as an initial torque, so that the initial torque of the auxiliary arm in the initial state can be directly called as the current torque when the auxiliary arm is in the initial state, and the calibrated initial torque can be corrected through acquiring the length and angle of a main arm of the crane and the state of the auxiliary arm when the auxiliary arm is not in the initial state; and the torque from the auxiliary arm to the head of the main arm is added or subtracted according to the length and angle of the main arm and the state of the auxiliary arm, secondary complex calibration work is not needed, and thus, the aims of keeping the torque limiter precise and keeping the operation safety of the crane can also be achieved although the state of the auxiliary arm is changed.

Description

technical field [0001] The invention relates to the field of cranes, in particular to a crane, a moment limiter and a moment correction method and system thereof. Background technique [0002] The torque limiter is a device that prevents the lifting moment or lifting capacity of the crane from exceeding the maximum load allowed by the current state of the machine. When the crane is in a dangerous situation, the torque limiter will provide the operator with sound and light alarms and make unloading The protection device forcibly stops the operation in the dangerous direction, so that the crane is always under the safety monitoring of the torque limiter when it is working, so as to achieve the purpose of safety protection. Therefore, the precise operation of the moment limiter is the first condition to ensure the safe operation of the crane. [0003] In the prior art, the jib of most cranes is worn on the main arm. As an integral part of the crane, when the moment limiter is ...

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Problems solved by technology

[0004] In view of this, the present invention proposes a crane, a moment limiter and its moment correction method and system to solve the problem that the state of the jib when the crane is working cannot be accurately judged and the accuracy of the moment limiter is affected

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