General bridge crane parameters

- May 20, 2019-

The main technical parameters of the bridge crane are lifting capacity, span, lifting height, running speed, lifting speed, working type and power-on duration of the motor.

   The lifting weight, also called the rated lifting weight, refers to the maximum allowable lifting capacity of the crane, in tons (t).

The weight of the overhead crane is 5, 10 (single hook), 15/3, 20/5, 30/5, 50/lO, 75/20, 100/20, 125/20, 150/30, 200/30. 250/30t (double hook) and many more. The numerator in the number is the main hook weight, and the denominator is the secondary hook weight. For example, a 15t/3t crane means that the main hook has a rated lifting capacity of 15t and the auxiliary hook has a rated lifting capacity of 3t. The bridge crane can be divided into three grades according to the lifting capacity, 5~10t for small cranes, 10~50t for medium-sized cranes and 50t for heavy-duty cranes.

   The span of a bridge crane refers to the distance between the centerlines of the wheels at both ends of the main beam of the crane, that is, the distance between the centerlines of the cart tracks, in meters (m).

Bridge crane spans are generally 10.5, 13.5, 16.5, 19.5, 22.5, 25.5, 28.5, 31.5m and so on. Every 3m is a grade.

Lifting height: The distance between the upper limit position and the lower limit position of the crane's spreader or grabbing device (such as grab, electromagnetic chuck) is called the lifting height of the crane in meters (m).

    Cranes commonly used lifting heights are 12, 14, 18, 22, 26m and so on.

    The running speed refers to the speed corresponding to the moving mechanism of the big and small cars when the drag motor is running at the rated speed, in meters per minute (m/min). The running speed of the trolley is generally 20~60m/min, and the running speed of the cart is generally 20~135m/min.