How to Select the Right Double-Girder Overhead Crane

Do you need to buy a double girder overhead crane? There are many important factors to consider when buying a double girder overhead crane, such as load-bearing capacity, span, hook method, etc. Here are the important factors to consider, which we'll cover in detail.

Double-Girder Overhead Crane：

The double girder overhead crane is widely used for lifting heavy materials in plants, warehouse, and material stocks. It is a heavy-duty bridge crane that is frequently used.

It’s composed with girder frame, crane travel device, and the trolley with lifting and moving device. The trolley and hoist run on a rail installed on top of the bridge girders, and the double girder overhead crane can be either top running or under running in design. Assemble the moving table on the outside of the two main girder, one side is prepare for the assemble and maintenance the crane move device, and another side is prepare for the assemble of the trolley conductor device.

Compared with single girder cranes, double girder overhead cranes have many advantages:

The lifting height is greater.

There is no limit to the maximum span.

There is no limit to the maximum lifting capacity.

If you need to add access walkways, maintenance platforms, lights, cabs, and other accessories, double girder overhead crane is the best choice.

1. Lifting Load:

Lifting load refers to the weight of the object you need to lift and move. Double girder overhead cranes are designed and manufactured for frequent lifting of heavy loads. This usually means a load of 20 tons or more.

2. Span:

The distance between the center lines of the wheels at both ends of the main girder is span.During the overhead crane consultation, one of the most important measurements you will need to provide is the span of the crane.

Under normal circumstances, the lifting load is less than 50t, the span is less than 35m, and there are no special use requirements, the single girder overhead crane can be selected. If a large span is required, the working speed is high, or heavy and long pieces are often lifted, it is advisable to choose double girder overhead crane.

3.Lifting Height:

Lifting height refers to the vertical height from the center of the hook to the ground.

A top-running, double girder overhead crane runs on top of each runway beam. An under-running, double girder overhead crane (commonly known as an underhung crane), runs on the underside of each runway beam.

Top-running cranes have a higher weight capacity than under-running cranes. They also provide more overhead room, and the greatest hook height. If maximum headroom or hook height are important to you, opt for a top-running, double-girder crane.

4.Classification:

Specification of Double Girder Overhead Crane:

5. Installation:

Double-girder overhead cranes require more material for the bridge beams and runway systems. They also place a greater strain on your building structure and foundation.

Your crane may require extra tie-backs or support columns to handle the added deadweight that comes with two girders instead of just one. Factor these things into your total cost of purchase and installation.

6.Manufacturer:

The final thing you must consider is the company behind the crane. Does the company simply manufacture cranes, or does it also offer a comprehensive range of other services? Your best option is to select a crane that’s designed, engineered and built by a manufacturer that also offers:

• installations

• engineering support

• custom-manufacturing according to your unique specifications

• a full line of spare parts

• maintenance services

• inspections conducted by certified professionals

• risk assessments to document the condition of your cranes and components

• operator training

Henan Zhonggong Group is a professional group company integrating the development, design, manufacturing, sales, installation and maintenance of cranes. Our company covers an area of more than 240,000 square meters, with a construction area of more than 100,000 square meters, and has more than 1,200 employees, including more than 160 middle and senior professional technical and management personnel. We have nearly 1,000 sets of advanced production equipment, testing and equipment, and can independently complete all technological processes such as turning, milling, planing, grinding, drawing, boring, rolling, drilling, punching, pressing, cutting, bending, cutting, coiling, riveting and welding, laboratory testing and heat treatment.

You can have full confidence in our professionalism and competence.

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