Overhead Crane - Yuantai Cranes Supplier

Overhead crane, also known as bridge crane is one type of material handling equipment to meet the lifting requirements of medium and heavy industries. Generally, an overhead crane is a crane with a lifting hoist traveling along the crane bridge between parallel runways.

Designed overhead crane project realizes your overhead crane expectation. The crane design services from Dongqi Crane is provided FOR FREE.

Designs of varous types of overhead cranes are provideded. Main types of overhead cranes are as following:

• Bridge Cranes / Overhead Cranes 
• Gantry Cranes
• Monorail Crane System
• Jib Cranes

European single  vs. double girder crane - Dongqi European hoist crane

Standard overhead cranes: Lifting capacity: 5 ton-550ton,  Span：10.5m-31.5m, Lifting height：1m-30m, Working duty is medium (A5, A6). Also supply non-standard products according to your requirements.Note:

• Lifting Capacity: 5ton, 10ton, 16/3.2ton, 20/5ton, 32/5ton, 50/10ton, 75/20ton, 100/20ton, 125/32ton, 150/30ton, 160/32ton, 200/50ton, 250/50ton, 300/75ton, 350/80ton, 400/80ton, 450/100ton, 500/100ton, 550/100T
• Span: 10.5M, 13.5M, 16.5M, 19.5M, 22.5M, 25.5M, 28.5M, 31.5M,
• Working Duty: A5(Used in working not so frequency, such as general machining and assembly workshop). A6 (Used in much more frequency work, such as auxiliary hoisting in metallurgy and casting workshop). A7 (Used in busy working and the hoisting of melted hot metal).

Applications

• Applied to materials handling between fixed span, and it's one of the most widely used crane with the largest number of varieties of different specifications.
• Widely used in carrying, assemble and unassembled of general weights, and also can equipped with various special hoists for special operation.
• Forbid to use in the conditions as easily combustible, explosive, corrosive (acid, alkali, plating, steam, etc.).

Conditions

Working ambient -25℃～+40℃, moisture ≤85%, altitude below 1000 meters, power supply 380V, 50Hz, 3phases (Adjustable according to customer's different requirement).

Single girder overhead crane v.s. Double girder overhead crane

An overhead bridge crane can be configured in a single girder overhead crane or double girder overhead crane design. In simple terms, a bridge girder, or beam, is the support structure that allows the trolley and hoist to move from side-to-side along the bridge. The trolley is used to precisely position the hoist prior to raising or lowering a load.

To a degree, both single and double girder cranes are equal in strength and durability. Single girder bridge cranes distinct itself from double girder bridge configuration mainly in terms of hook height, which is height your electric hoist can lift above the ground.

Due to the placement of electric hoist, the double girder crane offers more hook height, which is installed on the top of double girders rather than hung under the single girder.

A single girder bridge crane is usually designed for the lifts under 20 tons, span less than 31.5m, or the requirement for crane services classification is under A7 and A8.

Single girder overhead crane - Overhead crane types of Dongqi

The overhead bridge consists of one girder beam supported on each side by an end truck. The electric trolley and hoist commonly run on the bottom flange of the bridge, often called single girder underhung overhead crane. The single girder underhung crane is less expensive because of the following reasons:

• Only one beam girder is needed to move the trolley and hoist.
• Lower cost in freight.
• Easy installation.
• Hoist and trolley design is easier than those of double girder overhead crane.

When the lifts is more than 20 ton or the span is more than 31.5m, or the crane duty cycle is A7 and A8, the double girder overhead crane will be the first choice.

Double girder overhead crane - Overhead crane types of Dongqi

Two girder beams makes up the bridge, supported by an end truck or carriage on each side, with the electric trolley and hoist running on the rails, installed on the top of both bridge girders.

• Double girder cranes are recommended for heavier-duty applications, where lifts is more than 20 ton or the span is more than 31.5m, or the crane duty cycle is A7 and A8.
• Double girder crane is selected when crane needs to be custom designed, in terms of walk ways, driver’s cabs, magnet cable reels, and others.
• What more, double girder overhead crane offers more lifting height with the top running design.

What a top running crane or under running crane is should be understand when you want to know the clear differences between bridge cranes.

• On a top running crane, the beam bridge runs on rails along the top of the runway beams.
• On an under running crane, or underhung crane, the beam bridges are supported by the bottom of the runway beams and the crane wheels run along the bottom of the lower beam flange.

Top running crane is very flexible and versatile, which can be used to handle lifts with small and large capacity.

Top running crane - Type of overhead crane

With no limiting capacity, the top running crane can be used to handle lifts with small capacities to very large capacities. Top running cranes consist a rail installed on top of each runway, with wheels move on the rail, rather than on the bottom flange of the runway beam. Supported by the building structure or runway support columns, or sister columns, top running overhead crane are the first option for moving extremely heavy loads.

Under running crane, also called under hung cranes, suspension cranes, are used for lighter service and lower capacity applications, usually supported by ceiling or roof structures.

Under running or under hung crane - Overhead crane type

Due to the crane wheels are supported by the bottom flange of the overhead crane runway beams, functioned as the crane rail, the under running crane is also called under hung cranes. This type of overhead cranes can maximize the utilization of the floor space of your facility, because under running cranes are supported by the ceiling trusses or the roof structure.

With the utilization of an existing support structure (if adequate), or run on a newly-engineered support structure, the under running cranes may lower the cost of crane.

Features of underhung cranes

• Designed for lighter service / lower capacity applications
• Maximize utilization of the building’s width and height when supported by roof or ceiling structures
• Hook height is less than top running design because the bridge of overhead crane and electric hoist hang underneath runways

Workstation cranes are designed for transferring with limited effort in a smaller size work area. Workstation cranes are lighter-duty systems for lifts from 0.25 ton up to 2 tons in capacity, in a repetitive way to lift and position loads, to improve working productivity and ease of work flow.

Workstation cranes can use modular design to build and install, offering high flexibility without requiring an existing supporting structure for installation.

Workstation crane - A type of overhead crane of Dongqi Crane

Do you have a better understanding on what the best type of overhead crane for your application is. Maybe you will realize a workstation crane or monorail crane is needed for your specific lifting requirements instead of a full overhead crane installation. Maybe you need additional fabrication or engineering to have an overhead crane installed in the existing building structure. No matter what the situation is, you have to consider the following factors when selecting from the different types of overhead cranes:

• Crane capacity and Hoist capacity
• Span length
• Hook Height
• Crane duty class: Number of lifts per hour, Percent of lifts near or at capacity
• Structural building conditions: Existing runways / support structure in place
• Operating conditions
• Other special considerations
• Number of cranes required

All the ovehread crane can be customized according the required crane lifting capacity, working application, loading duty, and the other specific requirements. Contact us to get custom crane design today!

Dongqi Crane is capable of design complex crane projects from 0.5 ton-500 ton outdoor gantry cranes, jib cranes and container cranes to 0.5 ton-500 ton indoor lifting systems for various industries. Dongqi Crane is capable and qualified to provide crane design for light duty overhead crane with capacity such as, 1 ton, 2 ton, 3 ton, 5 ton, 10 ton, 20 ton, and heavy duty overhead crane designes up to 600 tons, etc.

Overhead crane project design services from Dongqi Crane- your overhead crane manufacturer and crane services provider - lowers your overhead crane price. Please send your overhead crane inquiry and then decided which crane supplier to selection. Because Dongqi Crane  belive that our overhead crane will standing out after the comparison of overhead crane quotations. Buy overhead crane from Dongqi Crane will be a desicion that you will never regret.