wire rope electric hoist is a kind of light-duty lifting tool. With compact structure, light weight, carrying Drum Lifter and simple manipulation. Close to in the absence of hoisting machinery equipment hoisting and installation of machines and tools of artifacts. The gourd according to its driving can be divided into two categories, hand and electric. Electric hoist general installation on the h beam guide rail, as with the crane hoisting mechanism is used. At present domestic chain, according to its structure can be divided into the spur gear drive and planetary cycloid pin gear transmission two kinds. Has developed into a series of different lifting weight products. SH is basic of gear transmission structure, its main models are SH1/2, 1, 2, 3, 10; WA is improved, the main models are WA1, 2, 2.5, 3, 5, 7.5, 10, 15, 20, SBL for cycloid pin gear planetary structure, main models are SHL1/2, 1, 2, 3, 10, etc. Type the Numbers behind the weight number, can be selected according to different needs. Gear type SH type of chain lifting heavy objects, along the direction of lifting zipper wheel drive hand, because of the screw on the shaft sleeve, sprocket and friction hold-down ratchet, and sprocket, ratchet wheel and shaft sleeve body, inherit the zipper pull hand wheel, makes the chain wheel rolling with coaxial, again through the planetary gear transmission, drive the guide frame and lifting chain wheel rolling, to make the weight increase. Rest rises, detent catch ratchet, not the reverse. Hanging heavy objects to fall, zipper according to drive in the opposite direction hand wheel, chain wheel and the ratchet release, weight can drop. Because the chain has since the brake system, so can the load safely promotion to the required position.