ZZHZ is a professional manufacturer for producing gantry crane. It is widely used in project construction. The design of its structure is reasonable, dismantle conveniently, high reliable and safe and various classification, which can meet the requirements of customers and get very good feedback.


1. main girder
a. single girder gantry crane
 Its structure is simple, fabrication and installation is convenient, self weight is small and its girder is almost box girder. The whole machine’s stiffness is low compared with double girder gantry crane. There are L and D type legs of single girder gantry crane.
b. double girder gantry crane
Its bearing capacity is large, the span is long, and the stability of the whole machine is good. But the self weight is heavier than single girder gantry crane with the same lifting capacity, and the same to the cost. There are box girder and truss girder type according to different structure of main girder. As usual, the users often adopt the box girder.
2. doorframe structure
A. gantry crane
a. gantry crane: the main girder doesn’t have cantilevers , and the trolley can run along the main span
b. Semi gantry crane: there are height differences of legs.
B. gantry crane with cantilever
a. double cantilevers gantry crane: the bearing force of structure and the reasonable utilization of construction area are reasonable.
b.single cantilever gantry crane : it is chose because of the limitation of construction site.
C. main girder structure
a.frame girder
It is welded by angle steel or joist steel. Its advantages: low cost, light self weight and good wind resistance. But because of a lot of welding points and defects of itself, so it has disadvantages such as high deflection, small stiffness, lower reliability and frequently checking welding points. It applies to the construction site which has low requirement of safety and lifting capacity is small.
c. box girder
It is welded by steel plates with high safe and high stiffness. It is usually used in large ton and ultra-large ton gantry crane, for example, MG1200 box girder gantry crane produced by Zhengzhou Huazhong Construction Machinery Co, .Ltd.
3. Honeycomb girder
As usual, it is isosceles triangle honeycomb girder which means the main girder is welded by honeycomb steel plate and triangle web steel. Its advantages are low center of gravity, light weight, high safety and good wind resistance compared with the box girder. And compared with the truss girder, its welding interface is big, the force of interface is uniform, the deflection is small and high stiffness. But it is welded by steel plate, so self weight and cost are higher than truss girder. Honeycomb girder gantry crane is the patent product of ZZHZ.
D.Purpose
a. general gantry crane
It usually adopts box girder and truss girder, and its use is the widest. It includes hook, grab bucket, electromagnetism, hoist gantry crane and semi gantry crane.
b.hydropower station gantry crane
c. gantry crane for ship building
d.container gantry crane