Thursday 21 June 2012

Applications of Overhead Cranes


Out of all the different types of cranes, the overhead cranes are the one that is used in most of the industries. It is also called as the Bridge Crane. It consists of parallel runways with a traveling bridge spanning the gap. A hoist, the lifting component of a crane, travels along the bridge. If the bridge is rigidly supported on two or more legs running on a fixed rail at ground level, then it is called as gantry crane.
The most common application is in the steel industry. At every step of the manufacturing process, until it leaves a factory as a finished product, steel is handled by it Raw materials are poured into a furnace by crane, hot steel is stored for cooling by the bridge crane, the finished coils are lifted and loaded onto trucks and trains by it and the fabricator or stamper uses an it to handle the steel in his factory. The automobile industry uses overhead cranes for handling of raw materials. Smaller workstation cranes handle lighter loads in a work-area, such as CNC mill or saw.
Almost all paper mills use bridge cranes for regular maintenance requiring removal of heavy press rolls and other equipment. The bridge cranes are used in the initial construction of paper machines because they facilitate installation of the heavy cast iron paper drying drums and other massive equipment, some weighing as much as 70 tons.
In many instances the cost of a bridge crane can be largely offset with savings from not renting mobile cranes in the construction of a facility that uses a lot of heavy process equipment. It has been a boon for the manufacturing industries. For more details please visit https://www.aceworldcompanies.com/

Wednesday 13 June 2012

Introduction to Chain Hoist : Everything You should Know about Chain Hoist


According to the dictionary, the device for lifting and raising heavy or cumbersome objects is called as the hoist. It is the member of the crane family. There are many different kinds of available in this category too. The most commonly used is the Chain Hoist. Theycan be of either the chain type or the wire rope type.
Common small portable hoists are of two main types, the chain and the wire rope or cable type. They may have a lever to actuate the hoist or have a loop of operating chain that one pulls through the block which then activates the block to take up the main lifting chain.
A hand powered chain hoist with a ratchet wheel is known as a "ratchet lever hoist" or, colloquially,”Come-A-Long". Going back in the history, the original hoist of this type was developed by Abraham Maasdam of Deep Creek, Colorado about 1919, and later commercialized by his son, Felber Maasdam, about 1946. It has been copied by many manufacturers in recent decades. A similar heavy duty unit with a combination chain and cable became available in 1935 that was used by railroads, but lacked the success of the cable only type unit.
The following are the features it offers:
·          Offered as hook suspension or with a range of push,
·          Mains contactors fitted as standard for increased safety
·          Complete electrical protection by low voltage control circuit
·          Seated protection from dust and water to IP55
·          Quiet and smooth hoist operation ensured.
·          Top hook fitted as standard
·          The heavy-duty 960-rpm. Brake motor features with adjustable  spring pressure
·          All units factory tested to 125% safe working load
·          Three phase 230-415V,50Hz units available
This was all about Chain hoist, if you want more details please visit https://www.aceworldcompanies.com/