Chain structure principle: take reverse non-return 1 ton Trolley speed reducer and the combination of the chain pulley block, the symmetrical arrangement of secondary spur gear rotational structure, durable, high efficiency. Chain advantages: 1. Meet the national standards, safe and reliable, durable 2. Good performance, easy maintenance 3. Great toughness 1 ton trolley, small volume, light weight, easy to carry 4. Hand pull small machine parts, high wire rope hoist manufacturers 5. Advanced structure, good appearance 6. Lifting goods without power supply area.