Characteristic: 1. Chain-type electric crane with the shortest distance to the fuselage. 2. Special clutch, the overload load and the upper and lower limits are automatically idling, and the lifting and lowering are stopped. 3. Use super-strong wear-resistant alloy copper keys with a safety factor of more than 6. 4. The powerful brake is accurate and safe, the main engine structure is simple and easy to assemble and disassemble, and the failure rate is extremely low. 5. The hook head can be rotated 360 degrees, and is equipped with an anti-fall safety buckle.