L48A1 Mast Sectionthe domestic large and medium-sized tower lifting mechanism, which speed control methods
The lifting mechanism is the most important transmission mechanism of the tower crane. It requires heavy load low speed, light load high speed, and large speed range. The advantages and disadvantages of the hoisting mechanism speed adjustment directly affect the performance of the whole machine.
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The small and medium-sized tower machines with a maximum starting weight of less than or equal to 6 t have fierce competition and strict cost control. The domestic multi-speed motor is mainly used for pole adjustment. The plan is simple and can still meet the needs of the work. 8T and 8T and above medium and large tower machines need better speed regulation performance. There are many speed regulation methods. There are three selection principles: first, it must be stable and the impact is small; Second, it should be economical and reliable, in line with national conditions; Third, it is necessary to facilitate maintenance
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