Some material handling applications are conducted in room sized chambers and required a fixed load travel path. A standalone hoist could be the best fit for such applications!
Hoist units represent the assembly of motors, gears, brakes, wire rope/chain, rope drum/bag-sprocket, hook etc. which are the sum total of all the components essential for the lifting/lowering mechanism for handling different loads (hyperlink).
Common components of a standalone hoist.
Motors: The motors are used to provide the travel and hoisting power to the hoist. There are different types of available motors viz. slip ring motors, conical rotor motors, pole changing motors, geared brake motors (brake + gearbox + motor assembly). Click here for further details (hyperlink).
Brakes: The brakes are used to regulate/stop the travel and hoisting mechanism of the hoist. There are different types of brakes available viz. Electro-Hydraulic Thrusters (EHT), Shoe brakes, disc brakes, geared brake motors (brake + gearbox + motor assembly) etc. Click here for further details (hyperlink).
Gearbox: The gearbox is used to transmit the rotary power of the motors to the hoist rope drum for lifting or to the wheels for hoist cross travel. Generally, planetary gearbox OR geared brake motors (brake + gearbox + motor assembly) etc. are used with the hoist. Click here for further details (hyperlink).
Wire Rope/Chain: Depending upon the load capacity and available hook headroom (hyperlink), hoists come with either chain or wire rope options. Click here for further details (hyperlink).
Hooks: Hooks are the main lifting units of the hoist. They are generally C shaped as a standard but Ram’s horn hooks can also be provided for some specific applications. Click here for further details (hyperlink).
Power Supply: The multiple options available for the power supply to the hoist are Festoon cables (most common), Drag Chain, MS Angle Bar, Shrouded Bus Bar (DSL), etc and the selection depends on multiple factors like location, application and the budget. There are also some electrical accessories required to supply power to the hoist which may include the isolator and the supply cables.
Control Type: The standard control of hoists is through pendant and trailing cable. But the control can be optimized using Radio Remote Control (RRC). Click here for detailed information. (hyperlink)
Supporting Structure: The hoist could be simply hung with lifting lugs for applications where there is no travel required OR can be installed on the bottom plate of an ISMB beam where there is requirement of cross travel. Click here for further details (hyperlink).
Additional Accessories: There are also additional safety/operational accessories available for the hoists and they are described as follows;
Variable Voltage Variable Frequency (VVVF) Drives: VVFD’s provide a wide range of normal and micro speeds which can be used for general load handling or inching applications. Click here for more information. (hyperlink)
Limit Switches: As the name suggests, the limit switches can be used for controlling the hoisting and cross travel motions. Click here to know about the different kinds of Limit switches. (hyperlink).
Buffers and end stop: The buffers on hoists and the end stop at the end of beam are used to minimize impact.
Types of hoists
We can broadly classify hoists into two main categories as described below in detail (you can click on any of them for detailed description):
Factors to be considered while installing a standalone hoist.
Let us now discuss the parameters that need to be considered before installing a hoist:
Application: The most important parameter which needs to be taken into consideration is your application. It also tells you whether you really need to install a hoist! For example, in many warehouses or workshops where we need both internal and external movement, it is much more beneficial to use a forklift than to install a hoist. Also, the application of the hoist would be a key indicator of the required class of duty of the hoist. (hyperlink)
Safe Working load (SWL): In general terms, safe working load can be considered as the load that any lifting device can carry without breakage. It is always advisable to incorporate some extra margin and/or consider increased load handling requirement in the future while calculating the required SWL of the hoist.
Height of Lift: The height of lift is the vertical distance by the which the load has to be lifted. It is a very crucial factor since it directly affects the length of wire rope/chain link, rope drum/bag-sprocket dimensions etc.
Travel length: Travel length tells us the total distance that the hoist has to travel. It also tells us the approximate length of the power supply lines to be installed.
Location: Indoor or Outdoor location of the hoist needs to be specified as special provisions need to be made for adverse weather conditions.
Brand: There are several hoist manufacturers in India, so many a times the user is inclined towards a specific or some few specific brands.
Pricing: Aggressive price point is what drives the course of many order finalizations and the technically superior brands should always be on their toes to keep up with the cut throat competition.
Service Availability: It is strongly recommended to check/verify the service availability of the hoist manufacturer in the vicinity of the hoist installation to avoid service/spares related hassles in the future.
So many techno-commercial considerations for a single procurement…. Intimidating isn’t it?
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