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About Electric Hoists
Electric hoists are a mechanical unit that is designed
to lift, lower or pull loads. Whether a manually-powered product for
small loads or a heavy duty electrical motor driven version, an electric
hoist can offer a load carrying capacity for companies and individuals,
which no human alone could match. Electric hoists can be operated by
electrical, manual, hydraulic or pneumatic power, but the most commonly
used are electric hoists. An electric hoists is powered by an electrical
motor that helps them lift or lower a load to a designated location.
These types of electric hoists are typically mounted in one of three
arrangements: lug, trolley or suspension mountings. For consumers who
desire something besides off-the-shelf mounts, many companies additionally
offer custom mounting configurations.
A common type of electric hoist is a chain electric hoist, which uses
a linked or roller chain to lift and lower loads. Chain electric hoists
are sturdy and can be advantageous because they are fairly inexpensive,
simple to operate, generally rust-resistant and low maintenance. Additionally,
these electric hoists are flexible and have the ability to withstand
high temperatures and other less desirable environments. An alternative
to a chain hoist is a wire rope hoist, which uses wire
rope instead of
chains to transport materials. These types of electric hoists can be
used in various positions, either stationary or as a mobile unit attached
to a trolley system. Other types of electric hoists are available for
very specific applications, such as those used to remove engines from
airplanes and automobiles, and those that help operate the gates of dams.
Because of the wide variety of materials and products that can be transported
using electric hoists, winches and cranes, many different industries
are able to benefit from these machines. An electric hoist can be used
to move and handle large rolls of paper to install in printing presses,
so that newspapers can be printed daily. In the food industry, electric
hoists are capable of moving large equipment that is used for the mixing
of ingredients and containers for storage. Electric hoists of this type
are generally made for the particular environment and can be very gentle,
depending on need. In mining applications, electric hoists are especially
useful for withdrawing shield support and mounting platforms from mines.
These electric hoists tend to be highly durable hoists that are able
to withstand the rough environment, plus they tend to be explosion proof.
When considering electric hoists, it is important to consider the application
for which it will be used. Maximum weight capacity, maximum lift speed,
line type and mounting type of the electric hoists need to be taken into
account as well. These are important considerations because, for instance,
buying a casual load lifting hoist to transport a boat would be disastrous.
Using a lighter load hoist would result in damage to the hoist and/or
boat, not to mention the safety issues it would raise for the employees.
Safety must be taken into account when using electric hoists to ensure
that the weight of the objects being raised or lowered does not surpass
the maximum load carrying capability. Injuries can happen when dealing
with this kind of equipment, so one must understand how to safely operate
these electric hoists machines before use in order to avoid harm.
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Types of Electric Hoists
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are supplemental hoists that are used to handle light loads at a higher
speed than the main hoist.
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are lifting units specially designed to raise and lower boats. Boat
hoists are typically hydraulically or electrically powered and can lift
up to 20,000 pounds.
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use roller or link chains as a lifting medium. Chain hoists are typically
electrically powered, but can be manually and pneumatically operated
as well.
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are lifting units designed to allow engine removal from automobiles,
airplanes or boats. Engine hoists are typically hydraulically powered,
but sometimes use an electrical motor.
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are exclusively used to lift the water controlling gates at dams.
- are devices used to lift heavy loads.
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have an integral drum, motor and gearbox, with no visible shaft couplings
between them.
- are attached to wall columns or ceilings.
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are hoists suspended from a trolley. These hoists can be built into
the trolley or connected to the trolley using a clevis or hook.
- pulls heavy loads horizontally.
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use wire rope as a raising/lowering medium. A complete wire rope hoist
consists of a rope storage drum, one or more motors, a gear box and
a braking system; they can be mounted in a stationary position or along
a monorail attached to a trolley that allows them to slide to different
locations.
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