Double beam gantry crane is a kind of heavy equipment can lift materials in the open air or along the railway, composed of two main beams, carts, carts and electrical equipment, lifting weight, span and lifting height are relatively large, there are two structural forms of box type and truss, lifting weight generally between 10-420 tons, span between 18-40 meters, lifting height between 10-30 meters, Job level is A5 or A6.

Working principle of double beam gantry crane
The working principle of double beam gantry crane is to use motor to drive the reducer, brake, drum and other components of the big car running mechanism and the small car running mechanism, through the wire rope or chain hook or other lifting or lowering, to achieve the horizontal and vertical direction of the material movement. Double beam gantry crane is composed of bridge frame, trolley running mechanism, trolley running mechanism, electrical equipment and other parts. The bridge is a rigid structure connected by the main beam and the end beam, which bears the load of heavy objects and moves in the horizontal direction on the track. The vehicle running mechanism is a transmission device composed of motor, reducer, brake, drum and so on. The drive axle frame moves on the track. The car running mechanism is a transmission device composed of motor, reducer, brake, drum, etc., which drives the car to move on the main beam and lifts or lowers the hook or other spreader through the wire rope or chain. Electrical equipment is a control system composed of control cabinet, push button switch, limit switch, etc., which controls all parts of the crane to work according to the instructions.

Type of double beam crane
There are many types of double beam cranes. According to the number and function of the trolley, It can be divided into single trolley double beam gantry crane (MG type), double trolley double beam gantry crane (ME type), double beam grab gantry crane (MZ type), electromagnetic double beam gantry crane (MC type), electromagnetic hook double beam gantry crane (MA type), grab bucket electromagnetic portal crane (MP type), hook grab bucket double beam gantry crane (MN type) Wait for 1. According to the load, span, height and other factors, the price of different types of double beam crane is different. Generally speaking, the price of the double beam bridge crane below 10 tons is about 30,000-50,000, 10-50 tons is about 50,000-200,000, 50-100 tons is about 200,000-400,000, and more than 100 tons is more than 400,000. The specific price also depends on the manufacturer, quality, service and other factors.

Advantages and disadvantages of double beam crane:
The advantages and disadvantages of different types of double beam cranes mainly depend on their structure, function and working environment. Generally speaking, the double beam crane relative to the single beam crane, has the following advantages:

The rated lifting weight of the double beam crane is large, which can reach several hundred tons, while the single beam crane is generally below 20 tons.
Double beam crane work level is high, can adapt to complex, frequent, efficient operation requirements, and single beam crane is suitable for mild or moderate operation.
The structure of the double beam crane is stable and can bear the larger load and wind pressure, while the single beam crane will appear bending deformation when the span is larger.

The twin beam crane also has some disadvantages:

The structure of double beam crane is complex, the cost of manufacturing and installation is high, its mass is large, and it occupies much space.
Double beam crane maintenance is relatively difficult, need professional personnel and equipment.
Double beam cranes require a higher roof height when used indoors.
According to the different types of double beam gantry cranes (MG, ME, MZ, etc.), they also have their own specific advantages and disadvantages. For example:

MG type single trolley double beam gantry crane is suitable for outdoor site or warehouse cargo loading and unloading, transportation and other operations. Its advantages are simple structure, convenient operation, low maintenance cost; Its disadvantage is that it cannot move in both directions at the same time.
ME type double trolley double beam gantry crane is suitable for lifting large items or two sizes of items at the same time. Its advantage is that it can realize a variety of combination ways and improve work efficiency. Its disadvantage is that the control system is complex and difficult to operate.
MZ type double beam grab gantry crane is suitable for handling bulk materials (such as coal, ore, etc.). Its advantage is that different forms and volumes can be selected according to the nature of the material grab; Its disadvantage is its large mass and high power consumption.