Application of PLC technology on double-beam claw-bucket overhead traveling crane

Abstract：Problems such as high fault rate and difficult maintenance exist in the traditional double-beam claw-bucket overhead traveling crane.For it, firstly, control principle of the overhead traveling crane is presented, an alteration concept of replacing contactor and relay with PLC is provided, and also the trapezoidal diagram of PLC is drawn.According to the alteration concept, the control system of a traditional overhead traveling crane has been reconstructed and works well in production that demonstrates the mentioned concept is feasible.It will be a unique and useful approach in equipment maintenance, alteration and improvement of electrical system.Also, it is worthwhile to spread owing to the simplicity of connection circuit lines and high operating efficiency.

Keyword：overhead;traveling crane PLC;switching quantity;analog quantity;