Bridge crane used in steel coil factory
A Bridge crane also known as overhead crane, overhead travelling crane, or industrial crane is a material handling machine which lifts, lowers, and transport a load horizontally. Typically, an Bridge crane involves a hook-and-line mechanism that moves along a horizontal beam which moves on a runway beam, the supporting structure.
Overhead canes are heavy duty material handling equipment with high lifting capacities for transporting load. Bridge crane travel is directed by an operator, either manually or with a wired pendant station or wireless controls. Typically, Bridge crane is used for the multi-directional movement of materials to help manufacturing, storing, loading or unloading works inside a facility or outside in a yard, or at a railway, or shipping port, and other application environments.
Generally, the Bridge crane is consisted of three main parts, the crane bridge, the hoist or trolley, and the runway. The crane bridge is the part which traverses across the runway. The hoist or trolley is the lifting mechanism which traverses across the crane bridge and lifts vertically.
The runway is tied to the building structure. Besides, there are other parts are involved, showing in the following diagram for your reference.
Double girder Bridge crane componets drawing
Crane capacity: The maximum weight the Bridge crane is required to handle.
Crane span: The horizontal distance between the rails of runway on which the crane travels.
Lift or hook height:The distance from the floor to the crane hook, which determines the height of the runway from the floor and is subjected to the clear inside height of the building.
Bridge, trolley and lift speeds: The rate at which the bridge or trolley runs or at which the hoist lifts. Dual speeds are available.
Crane bridge: The main travelling structure of Bridge crane which is consisted of two end trucks and one or two bridged girders varying with the type of the crane.
End trucks: The end trucks is located on both sides of the span. The end trucks house the wheels on which the crane runs.
Bridge girder(s)：Bridge girder is the principal horizontal beam of the crane bridge which is supported by the end trucks. The bridge girder of the crane is meat to support the trolley.
Trolley hoist: The trolley hoist is consisted of hoist and the trolley frame. According to the lifting requirements, one or more hoist can be installed, which can be supplied on the same trolley or on separate trolleys.
Trolley: The trolley takes the hoist across the bay along bridge girder(s) traversing the span.
Hoist: Hoist is mounted to the trolley and is the main lifting equipment together with the crane hook or other lifting attachment.
Bridge crane parts and components assembly 3 D presentation
Bridge crane mainly have two configurations: Top running Bridge cranes and under running Bridge cranes.
The top running Bridge crane or Bridge crane refers to the crane which has the bridge travel on the top of rails mounted on a runway beam supported by either the building columns or columns specifically engineered for the crane. The top running Bridge crane or Bridge crane is the most common crane configuration with the feature that the crane loads are transmitted to the supporting columns or free standing structure and with the advantage of minimum head room and maximum height of lift.
Top running Bridge crane
Top running Bridge cranes can be further classified into single girder, double girder, and box girder Bridge crane or Bridge crane in terms of girder types.
Single girder bridge crane is consisted of two end trucks, trolley hoist unit and a single bridge girder, on the bottom flange of which the trolley runs on.
Single girder Bridge crane designed for your application can be cost-effective. Single girder Bridge crane has lower wheel loads so that it will save on new support structures and it will also allow you to add more lifting capabilities to your runway structure without upgrading.
Double girder bridge craneis consisted of two end trucks, trolley hoist unit and two bridge girders, on the top of which located the rails on which the trolley runs.
Double girder Bridge crane provides better hook height for the hoist of the double girder Bridge crane is mounted on top of the bridge rather than underneath.
Box girder bridge crane is a crane equipped on a girder formed by multiple walls in the shape of enclosed tube, rather than on an I-beam or H-beam.
Box girder Bridge crane is used for heavy duty material handling with the feature of extremely rigidity and durability.
Under-running or under-hung Bridge crane or Bridge crane has the end trucks ride on the bottom flange of the runway, which is usually suspended from the roof, with no need of extra floor columns for the support of the runway. The under-running or under-hung Bridge crane has the advantage of taking no floor space and saving cost for supporting system. Moreover, an under-running or under-hung Bridge crane can be applied to the sloped ceilings or multiple crane systems.
Under running Bridge crane
In terms of crane girder, the under-running or under-hang Bridge cranes can be grouped into single girder, double girder and box girder Bridge cranes.
Single girder under running Bridge crane provides you a cost effective material handling solution for it can save new support structure because of its reduced wheel loads, which also makes it possible to add more lifting capabilities without upgradation.
Double girder under running Bridge crane is usually used for handling loads over 25 tons, which is usually provided with a complete material handling solution. Double girder cranes provides a higher lifting height for the crane hook travels between the beams, comparing with that of the single girder Bridge crane.
To choose the top running or under running Bridge crane is mainly determined by two factors:
Top running Bridge crane configuration is best used when headroom is an issue. Double girder top running configuration is the most space efficient one. Whereas when the headroom is not an issue a top or under running configuration can be either single girder or double girder.
Bridge crane or Bridge crane can be applied for material handling in various situations and industries, such as, Automotive, Beverage, Chemicals, Commercial printing, Manufacturing, Newspaper, Paper, Steel and warehousing and distribution, etc.
Bridge crane are most applied material handling equipment for the following advantages:
Bridge crane control
Bridge crane control controls your crane safety and reliability. Flexible and reliable control for Bridge crane are very important. Usually, the following controls are frequently used on Bridge cranes.
Bridge crane runway
Generally the lifting capacity of the Bridge cranes decides the types of crane girders: single, double and box girder. The single girder overhead is designed for handling loads of about 20 tons and the double girder and box girder Bridge crane can be used to handling materials above 20 tons.
To choose the right material handling solution is critical. Therefore the customized or tailored overhead are manufactured. However, how to find out the best type of Bridge crane for your application? The most suitable Bridge crane should be selected out based on the specific application conditions and your building dimensions if the building has been constructed. The following tips is given for your reference to find your best cranes.
1. Crane lifting capacity ;;2. Lifting height of crane. 3. Runways height. ;4. Clearance required. 5. Building width.
6. Crane span. 7. Building height. 8. Runway size and length. 9. Hook approach & end approach 10. Hoist speed
11. Bridge gravel speed12. Trolley travel speed. 13. Electrical requirements. 14. Control requirements.
Bridge crane maintenace
As there many parts of the Bridge crane, for different technical characteristics of the various components, in the actual work they will generally be maintained into periodic check in weeks.
Our offering of Bridge cranes/ Bridge cranes includes 12 series of products, with the lifting capacity ranging from 1 ton to 400 ton. They are widely used in various industries and places.