Discussion of container spreader from technical and cost point of view.

First, from the technical point of view

1, rotating hook and hydraulic sling, the total height will be greater than 4 meters, to some extent, affect the lifting height;

2, the rotating hook requires the wire rope to be connected with the hook to be big, so that the stability of the hook body can be ensured when rotating so as to make the trolley structure become larger and more complicated.

3, rotating hook and hydraulic sling, its deadweight at least 8 tons, resulting in increased crane structure.

Two, from the cost point of view, dedicated rotary hook and hydraulic spreader, in explosion-proof requirements, the price of about 500 thousand, plus the crane on the sling control system, the total cost of about 550 thousand. Based on this, we put forward our scheme to users, using the simple unpowered container spreader with shelves, which has the following advantages compared with the user scheme and the conventional unpowered spreader:

1, due to the unpowered scheme, the whole sling system is not electrified, and the explosion prevention needs not be considered. Both the simplified design and the cost reduction can be realized.

2, the use of double hanging points on the shelves, crane adopts double electric hoist lifting method, simplifies the design of the crane, at the same time relative to the conventional no power spreader, this scheme sling can not rotate, easy to box.

3, reduce the weight of the sling, use rack plus unpowered spreader, its deadweight is not more than 3 tons, greatly reducing the user cost.

4, the shelves plus non power crane scheme, the total height can be controlled within 2 meters, than the conventional non power crane is reduced by 1.5 meters, than the rotary hook with a hydraulic spreader, reduction of more than 2 meters, greatly reduced due to lifting height is not enough trouble.

5, compared with the user scheme, the scheme reduces the cost by more than 700 thousand, which greatly benefits the user's bidding.