Research And Design Of Hydraulic And Electrical Control System For Wheel Crane Telescopic Boom

The boom is the main bearing structure of truck cranes. The boom is usually made into box-type fabric with telescopic cylinder or telescoping system and slide pad inside. The loading capacity and overall stability and total mass depend on whether the boom design is reasonable and it influences the development of wheeled cranes.The boom usually weight takes 13-20% of the total mass,andeven more in the bigger cranes which will cause the prompt reduction of lifting capacity while working with big radius and hoist height while lifting heavy loads, so it is one of main obstacles which influence negatively on the development of big cranes.The telescoping control technique depends on the structure of the telescoping mechanism while the telescoping mechanism technique affects the boom weight and overall machine performance directly as well as the development of boom and even the whole crane. So famous foreign companies always pay more attention tithe development of the telescoping mechanism and have the own patent echniques.The application of electro-hydraulic mechanical integration combined control technique makes the objective of one single cylinder automatically control five telescopic booms possible.In this paper, The works I have done and the result are as following:(1)The control system of single cylinder telescopic machinery is aliped by using PLC.In this The operator can control the boom's action according to set mode and logic sequence by the human-computer terface,and the real time monitoring of boom'state is available. Hardware circuit and software are designed in this papers, which are proved to be reliable and stable by being put into proactive.(2)By comparing a wide range of telescopic boom of the advantages and disadvantages of the control mechanism,we elect a representative of the advanced research arm of the telescopic control mechanism, and a detailed analysis of the calculation and design.(3)The parameters of the primary elements of hydraulic elements such as bump,valve and cylinder, are calculated and the primary static state index also are calculated. (4)Design control system of hardware circuit, the electrical control system design and calculation of components in the basic functions to meet the conditions, so that it will have high reliability and stability.(5)The key control circuit's mathematics model of hydraulic system is set up in this essay and dynamic characteristic is analyzed via the model. We have used AMESim simulation software on telescopic boom cylinder position servo systems, and marketed analysis of the hydraulic system simulation.(6)We designed the flow chart of electrical control system and used programming software Siemens STEP7-Micro/MIN produce telescopic boom's automatic and manual movement control procedures, and drive it to simulation.