Selection method of single beam crane and double beam gantry crane:
(1) Single girder crane and double girder gantry crane are generally selected, with the lifting capacity below 50t and the span within 35m. There is no special use requirement, so the single main girder crane should be selected. If the gate leg is required to be wide, the working speed is high, or heavy and large pieces are often lifted, double beam gantry crane should be selected.
(2) Span and cantilever length: the span of gantry crane is an important factor affecting the quality of the crane itself. In the selection, the span should be minimized as much as possible while meeting the equipment usage conditions and meeting the span series standards.
(3) Principles for determining track width
(a) Can meet the stability requirements of the gantry along the crane track direction;
(b) The overall dimensions of the goods should be able to smoothly pass through the support leg flat steel frame;
(c) Pay attention to making the wheelbase B proportional to the span S, generally taking the wheelbase B=(1/4-1/6) S.
(4) Determination of spacing size of gantry crane: during operation, a certain space size shall be reserved between the external size of gantry crane and the cargo and transport vehicle passages in the storage yard to facilitate loading and unloading operations. When loading and unloading general transportation vehicles within the span, a distance of more than 0.7m should be maintained from the door legs. When the lifting appliance is not working, there should be a distance of more than 0.5m between it and the transportation vehicle, and when goods pass through the door legs, there should be a distance of more than 0.5m.
(5) The selection of electrical equipment of gantry crane shall comply with the relevant provisions of General gantry crane GB/T14406-1993.