西驰变频器在塔式起重机上的应用（Application of speed inverter in tower crane）.doc

西驰变频器在塔式起重机上的应用（Application of speed inverter in tower crane） Application of speed inverter in tower crane The tower crane is mainly aimed at the formwork technology in the construction process. It is suitable for lifting and hoisting of building materials and components in the construction of reinforced concrete structures in industrial and civil construction. 1., the main speed regulating mechanism of lifting mechanism in china: Lifting mechanism is the most important transmission mechanism of tower crane. At present, the traditional speed regulation requires heavy load, low speed, light load, high speed and large speed range. The speed of hoisting mechanism affects the performance of the whole machine directly. There are three principles for the selection of speed governing mechanism of lifting mechanism: first of all, to be smooth and small impact; secondly, to be economical and reliable, to meet the national conditions; and three, to facilitate maintenance. 1.1 multi speed motor variable pole speed regulation 4 rope maximum weight less than 6T of small and medium-sized tower crane competition is fierce, cost control is strict, the domestic speed motor variable pole speed based, simple program, widely used, often use 4/8/32 very fast motor realization. 1.2 speed reducer with electromagnetic clutch and single speed winding rotor motor with eddy current brake This method has been used for decades in our country, but now it is no longer used. It changes the speed ratio of the reducer by electromagnetic clutch, and obtains the softer characteristics and the slow position speed by the series resistance of the single speed winding rotor motor with eddy current brake. Its advantage is that the running ratio is stable, and the speed ratio can be larger. Many of its shortcomings, the first electromagnetic clutch is generally used for domestic machine tool products, short life, poor reliability; second is not air dynamic transform clutch gear, it will decline, this is ver