Research And Design On A New Lifting Moment Limiter

Lifting Moment Limiter is an essential safety protection equipment for boom typeconstruction machinery. The truck cranes, caterpillar cranes, wheel cranes, navalrepair cars, aerial ladder, and other products of Zoomlion must be installed safetyprotection device now. Lifting Moment Limiter, which is an important kind ofhoisting machinery overload protection device, involves the following technologyareas: embedded hardware, embedded software, structure calculation, hydraulicsimulation, system simulation, numerical treatment, EMC simulation, reliabilitydesign and so on.In this paper, By studying of crane torque algorithm model, the algorithm modelof Lifting Moment Limiter is accurately established, which has high precision, goodconsistency, strong applicability and short debugging time. In view of the unique badenvironment of construction machinery products, stable and reliable hardware systemis designed, which has a specialized power supply module circuit, fault self-diagnosisfunction, sensor adaptive function, electromagnetic interference function and so on.About software system, ARM+Linux+Qt was used and have a good effect on thesystem performance, interface effect, system architecture and program articulation.After optimizing Linux operation system and driver, the performance and reliabilitywas improved when software running. The Lifting Moment Limiter designed in thispaper had been passed the reliability test of related national standards, whichconforms to the corresponding technical requirements.The various functions and technical indicators of the Lifting Moment Limiter inthis paper have met the national standard and which is much better than the primaryones in Zoomlion. Lifting Moment Limiter has strong characteristics of generictechnology, and has a very wide application field, can be applied to otherengineering machinery products.