LD electric single-girder crane is composed of main girder welded by steel plate and I-beam, end girder, electric hoist and operating mechanism. The electric hoist runs along the lower flange of the main girder I-beam to finish the lifting work. Lightweight structure, easy installation and maintenance, etc., the lifting capacity range from 1-32t, the applicable span is 7.5m-31.5m, the working temperature is -25℃～+40℃, and the humidity is ≤84%. It is widely used in factories, warehouses, stockyards, etc. Lifting cargo on different occasions. The working level is A3-A5. There are three modes of operation: ground handle, wireless remote control and driver’s cab. There are two types of cabs: open and closed. The running of the cart adopts the form of separate drive, conical motor braking, and open gear transmission.