This product is composed of a box-shaped main beam, end beam, trolley, and running mechanism. The electric hoist is installed on the corner trolley as the lifting mechanism. The lower horizontal wheel is arranged at three points with the vertical walking wheel. The position of the electric hoist is raised from the lower side of the traditional main beam to the upper side of the main beam, which effectively improves the lifting height. The trolley is driven by a conical motor brake and open gear transmission. The main girder is a box-shaped structure with partial rails and horizontal wheels on the upper and lower sides, which is safe and reliable, and can prevent rail gnawing. The running of the cart adopts the form of a separate drive, conical motor braking, and open gear transmission.