Henan Tongda Lifting Equipment Co., Ltd. was established in 2015 and is located in Zhengzhou City, Henan Province. Convenient transportation and excellent location. Henantongda is a trading and manufacturing company. It specializing in the manufacture and sale of lifting equipment, road and bridge equipment, engineering machinery equipment, subway shield machine equipment, tower cranes and construction lifts. Our main products are: all kinds of common gantry cranes (container gantry cranes, grab gantry cranes, electric hoist gantry cranes, hook gantry cranes), manual and electric single beam and double girder bridge cranes (QZ grab double girder bridge cranes, QD hook bridge cranes, QC electromagnetic bridge cranes, LH electric hoist double beam crane), and various crane accessories. We provide professional support services, project management, transportation and installation, maintenance, logistics and other service support. Tower crane and lift construction.

The pulley is a small wheel with a groove around it that can rotate around the axis. A simple machine consisting of a disk that can be rotated around a central axis and a flexible cable (rope, tape, cable, chain, etc.) that spans the disk can be called a pulley.The pulley block is a simple machine assembled from a plurality of movable pulleys and fixed pulleys, which can save labor and change the direction of force. The labor saving of the pulley block is determined by the number of rope strands, and the mechanical efficiency is determined by the gravity of the pulled object, the gravity of the moving pulley and the friction.