This product consists of a box shaped main beam, end beam, trolley, and operating mechanism. The electric hoist is installed on the angle shaped trolley as the lifting mechanism, and the angle shaped trolley is arranged in a biased hanging form on one side of the main beam for operation. The trolley is equipped with upper and lower flat wheels, which are arranged at three points with the vertical walking wheel. The position of the electric hoist has been raised from the traditional lower side of the main beam to the upper side of the main beam, effectively improving the lifting height. The car operates with a conical motor brake and an open gear transmission. The main beam is a box shaped structure with eccentric rails and horizontal wheels installed at the top and bottom, which is safe and reliable, and can prevent rail biting. The operation of the crane adopts a separate drive form, with a conical motor for braking and an open gear transmission.