Gantry crane can press frame structure form, according to the form of main girder, according to the main girder structure, classified according to the application form.Frame structure [1]
Divided into gantry crane and cantilever gantry crane
Gantry crane
1. The whole gantry crane: main girder overhanging, within the car in the main span;
2. The semi gantry crane: leg height difference, can be used according to the field of civil engineering request.
Cantilever gantry crane
1. Double cantilever gantry crane: one of the most common structure form, the structure of the force and the area of effective utilization is reasonable.
2. Single cantilever gantry crane: this kind of structure is often chosen by site restrictions.Main girder form [1]
1. The single main
Single girder gantry crane structure is simple, convenient installation, its quality is small, box girder are partial rail frame structure.Compared with the double girder gantry crane, less overall stiffness.So when lifting weight Q t, 50 or less across degrees S 35 m or less, can use this form.Single girder gantry crane gate legs have L type and C type two kinds of forms.L make convenient installation, good force, its quality is small, but, lifting the goods through the leg space is relatively small.C type of supporting feet make it tilt or curve, purpose is to have a larger transverse space, in order to make the goods smoothly through the leg.
2. Double girder
Double girder gantry crane capacity is strong, big span, the overall stability is good, many varieties, but the quality itself with the same weight of single girder gantry crane compared to larger, cost is higher also.According to the main girder structure is different, and can be divided into two forms of box beam and truss.More commonly used box structure.Main girder structure [1]
1. The truss beam
Use Angle or the structure of I steel welded together, the advantage is low cost, light weight, good wind resistance.But because of the flaws of welding point and truss truss beam with large deflection, stiffness is small, relatively low reliability, shortcomings and so on need frequent testing solder joints.Suitable for low safety requirements, lifting weight smaller venues.
2. The box girder
Using steel plate welded into a box structure, has the high security, big stiffness, etc.Commonly used in large tonnage and very large tonnage of gantry crane.As pictured MGhz1200, weight of 1200 tons, is the nation's largest gantry crane, girder box girder structure is adopted.Box girder at the same time, it has high cost, since the major and wind resistance were some drawbacks.
3. The honeycomb beam
A refers to "isosceles triangle honeycomb beam", main girder end face for the triangle, honeycomb holes on both sides of the oblique abdominal, top and bottom chord.Honeycomb beam absorbed truss beam and the characteristics of box girder, the truss beam has a larger rigidity, the smaller bending degree, reliability is high.But because of USES the steel plate welding, weight and cost is a bit higher than the truss beam.Is suitable for the use of frequent or lifting weight or beam.Because this kind of beam type for patent products, so manufacturers is relatively less.Application form [1]
1. General gantry crane
Rail gantry crane [1]
This kind of crane with box type and braced structure, use the most extensive.Can carry a variety of items and material, the weight below 100 tons, the span of 4 ~ 39 meters.Grab the general gantry crane work level is higher.Ordinary gantry crane is mainly refers to hook gantry crane, grab, electromagnetic, gourd, as well as the semi gantry crane.
2. Hydropower station gantry crane
Mainly used for lifting and opening and closing valve, also can install operations.Weight of 80 ~ 500 tons, span is small, to 8 to 16 meters;Hoisting speed is low, for 1 ~ 5 m/min.This kind of crane, although not often lifting, once use work is very heavy, so to improve the working level appropriately.
3. Shipbuilding gantry crane
Use on slipway assembled hull, regular two lifting trolley: there are two main hook, a the bridge frame flange orbit;Another have a main hook and a pair of hook, flange of the orbit under the bridge, in order to flip and hanging large hull section.Lifting weight general for 100 ~ 100 tons;Span of 185 meters;Hoisting speed of 2 ~ 15 m/min, and motion of 0.1 ~ 0.5 m/min speed.
4. Container gantry crane
Used for container terminal.So that the quay wall container carrier bridge to unload the container from the ship
Rail gantry crane [1]
To the yard or rear, the container gantry crane stacking up or shipped directly loading, can accelerate the turnover of or other container transport bridge crane.Can be stacked high 3 ~ 4 layer and 6 rows of container yard wide, generally use tyred, useful also trolley type.Container gantry crane compared with container straddle carrier, its span and height are larger on either side of the door frame.In order to adapt to the transport of port terminals need, this kind of crane work level is higher.Hoisting speed of 8 ~ 10 m/min;Span across the number of container line according to need to decide, 60 meters corresponding to maximum 20 feet long, 30 feet, 40 feet container lifting weight respectively about 20 tons, 25 tons and 30 tons.
According to the relevant provisions of the industry standard GB/T14406 gantry crane mainly consists of the following parts
1, cylindrical wheels,
2, buffer
3, block brake
4, steel wire rope
5, lifting hook
6, cab
7, reducer
8, casting roller
9, the casting roll
10 and motor
11, electronic control equipment [1]