Topic: Hoist: Chain hoist or Wire rope hoist
HOISTS
A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain
wraps. Cranes and Hoists are somewhat interchangeable terminology since the actual lifting mechanism of a crane is
commonly referred to as a hoist. Hoists may be integral to a crane or mounted in affixed position, permanently or
temporarily. When a hoist is mounted to a trolley on a fixed monorail, two directions of load motion are
available: forward or reverse, up or down. When the hoist is mounted on a crane, three directions of load
motion are available: right or left, forward or reverse, up or down. Figure below shows a rope hoist for
double girder crane application.
Fig- Double Girder Crane Hoist
The majority of hoists used in the United States are classified as Standard or “packaged hoists”, typically
defined as largely self contained units, prepared to be installed on existing structures.
Hoist Lifting Media
There are two basic hoist lifting media – Wire Rope Hoist which is very durable and will provide long term,
reliable usage and the other type of hoist is the Chain Hoist.
For a given rated load, wire rope is of lighter weight per running foot but is limited to drum diameters far
large than the lift wheel over which chain may function. Therefore a high-performance chain hoist may be
of significantly smaller physical size than a wire rope hoist rated at the same working load. High speed
lifting (60 ft/min +) requires wire rope over a drum because chain over a pocket wheel generates fatigue
inducing resonance for long lifts.
Which hoist is better – Chain hoist or Wire Rope hoist
Chain Hoist
Chain hoists are used for lower capacity, lighter duty applications and for projects in which cost is a
primary deciding factor. Chain hoists are mainly used for maintenance tasks. The main reasons for
choosing a chain hoist are the following:
1) Possible to change height of lift by changing the chain (versatile)
2) Compact design (no drum, which saves space)
3) Portable and can tolerate greater levels of abuse
4) Usually more economical than a wire rope hoist
5) Provide true vertical lift at no extra cost
6) Capacity up to 5 tons (up to 20 tons for some makes)
Chain hoists do, however, have certain inherent inconveniences, such as
1) Limited lifting speed
2) Noisier operation than a wire rope hoist
3) May be problematic at a height of lift of over 20ft (6 meters)
4) Space taken by the chain or chain container
Wire Rope
The wire rope is a piece of equipment that is used mainly for production tasks. The main reasons for
choosing a wire rope hoist are the following:
1) Very fast lifting speeds than a chain hoist
2) Quieter than a chain hoist
3) No room taken up by chain or chain receptacle
4) Recommended for considerable long lifting height
5) Very smooth lifting operation such as handle glass panel
6) Heavy Safe Working Load up to 25 tons
Both wire rope and chain hoists available in market today are rugged and durable products. A good load
chain can lasts up to 30 times longer than standard wire rope, it greatly reduces the down time and operational costs. Duty ratings stated in various standards (HMI/DIN / FEM) are a better indicator of the
durability of hoist type (chain or wire rope). Therefore, when purchasing a crane, focus on lifting speeds,
headroom and features, less on the type of hoist.
overhead hoist Power Application
Three methods of applying power for overhead hoists:
1) Manual – By hand Chain
2) Electric – The most common power source application
3) Pneumatic – Often required in applications of high speed, higher duty cycle involving rapid, repetitive
tasks or hazardous areas where electric power is inadvisable.
HOIST SELECTION FACTORS
To select the proper hoist, consider:
1) The weight of the load to be lifted including below-the-hook lifting,
load supporting, and positioning devices.
2) Physical size of the load.
Holding and orienting devices.
Design for center of gravity (control & stability).
Lift – the vertical distance the load can be moved.
3) Clearance Considerations
Headroom
Obstacles to be cleared during the load transfer.
Design for vertical lift required including holding device height.
4) Lifting Speed Considerations
Distance the load is to be raised and lowered
Frequency of usage
Required positioning accuracy
Nature of the load being lifted
5) Hoist duty Cycle Considerations based on:
Number of lifts per hour
Total number of lifts per shift
Maximum number of starts and stops per hour
Number of shifts per day
Average distance load is raised and lowered
Average weight to be lifted
Maximum weight to be lifted
Frequency of lifts with maximum weight.
Hoisting equipment offering of Dongqi
Various types of hoists are provided by Dongqi Group, the following list will give you a general introduction of Dongqi Hoists. Please contact us to select the right Hoists and lifting equipment for you application.
Chain Electric hoist
Electric hoist
Electric hoist
The electric chain hoists can be used to handle material with the lifting capacity of 0.5 ton to 35 ton, lifting height of 3 to50m, with the working class of M3 and M4. Hoistdq offers you various types of electric chain hoists to solve you material handling solutions.
DHS Series Electric Hoists, TCH series Chain Electric Hoist DHP series Chain Electric Hoists
Electric hoist dhs Electric hoist tch Electric hoist dhp
DHS Series Electric Hoists:1 ton, 2 ton, 3 ton, 5 ton,10 ton
TCH series Chain Electric Hoist：1 ton, 2 ton, 3 ton, 5 ton,10 ton
DHP series Chain Electric Hoists：1 ton, 2 ton, 3 ton, 5 ton,10 ton
More information about Chain Electric Hoist, please click.