Lifting capacity
Lifting capacity, also known as rated lifting capacity, refers to the maximum load actually allowed by the crane, measured in tons (t).
The lifting capacity of bridge cranes includes 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 other types. The numerator in the number is the lifting capacity of the main hook, and the denominator is the lifting capacity of the auxiliary hook. For example, a 15t/3t crane means that the rated lifting capacity of the main hook is 15t, and the rated lifting capacity of the auxiliary hook is 3t.
Bridge cranes can be divided into three levels according to their lifting capacity: 5~lOt is a small crane, lO~50t is a medium crane, and 50t or more is a heavy crane.
Span
The span of a bridge crane refers to the distance between the center lines of the wheels at both ends of the crane's main beam, that is, the distance between the center lines of the trolley tracks, in meters (m).
The span of a bridge crane is 10.5, 13.5, 16.5, 19.5, 22.5, 25.5, 28.5, 31.5m, etc. Every 3m is a level.
Lifting height
The distance between the upper limit position and the lower limit position of the crane's sling or grabbing device (such as grab, electromagnetic suction cup) is called the crane's lifting height, in meters (m).
The commonly used lifting heights of cranes are 12, 16, 12/14, 12/18, 16/18, 19/21, 20/22, 21/23, 22/26, 24/26m, etc. The numerator is the main hook lifting height, and the denominator is the auxiliary hook lifting height.
Running speed
The running speed refers to the speed of the trolley moving mechanism when its drag motor runs at the rated speed, in meters per minute (m/min). The running speed of the trolley is generally 40~60m/min, and the running speed of the trolley is generally 100~135m/min.
Lifting speed
The speed at which the motor of the lifting mechanism raises the weight at the rated speed is the lifting speed. Generally, the lifting speed does not exceed 30m/min, which is determined by the nature, weight and lifting requirements of the weight.
The lifting speed also has the empty hook speed, which can shorten the non-production time. The empty hook speed can be as high as twice the rated lifting speed.
There is also a special case of lifting speed. The low speed when the heavy object is close to the ground is called the landing low speed. In order to ensure the safety of people and goods, its speed is generally 4~6 m/min.
