General-purpose Multi-function Crane Torque Limiter Study

Crane moment limiter that is equipped on the crane is an important overload protective device. It provides safeguard for the safety work of crane. This paper is based on the efficient experience learnt through the comparison and analysis of the present domestic and foreign moment limiter. In this paper, the author proposes the idea of separating the main control unit of system and the display unit, which can enhance generation and function, greatly reduce building and maintenance costs, increase the precision of control and boost up expansibility of system.MCU W77E58 is used as a core component in the main control unit of system. It samples signals from the sensors, calculates, judges and executes the corresponding control action. In the display unit, the author chooses W78E58 as the controller. Liquid Crystal Display, which can provide both interaction between people and machines and a large amount of information, is applied, so that the parameters of the working conditions of crane can be displayed dynamically. Data transmission between the main control unit and the display one is supported by the communication protocol that is developed by the author.The adjusting and running of the system indicates that the whole design is feasible and reliable, and the presumed functions have been conducted successfully.