Abstract
For the requirements of volume of cage, load and lifting height, Elevate mechanism of large-scale multi-stage direct-acting hydraulic hoist are adopted when construction hoist lifts material and staff in high-rise construction. Multi-stage expansion of hydraulic cylinder can cause towing oil pipe frequently. Friction and wear between oil pipe and framework is appeared, and oil pipe bursting is occurred. It directly influences both the constructing progress and safety operation. With the ingenious design of hydraulic cylinder and pipe connecting mode, oil pipe towing is avoided telescoping hydraulic cylinder. It provides a new way in other connecting mode of hydraulic system.
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