An electric chain hoist refers to a powered lifting apparatus that uses a motor to drive a chain mechanism. This allows it to lift and lower heavy objects with high accuracy and control to any height or position. Electric chain hoists are used in warehouses, manufacturing plants, construction sites, automotive workshops, or any other facilities that need to repeatedly vertically lift heavy materials and equipment.

Electric chain hoists are available in different configurations and capacities, starting from small 250 kg units for light workshop applications to heavy industrial models that can manage 20 tons or more. The motor rotates a chain wheel or sprocket, which in turn moves the load chain to either lift or lower the load. Electric chain hoists can be mounted to a ceiling, on a beam trolley for horizontal movement, or to a jib crane for more versatile positioning. The latest electric hoists include safety features such as an overload protection, an emergency stop and upper and lower limit switches to prevent the hook from moving beyond safe limits.Power Options and Variations

Electric hoist chains can be configured for a variety of working environments and loads. For light duties of around 2 tonnes, single-phase electric hoists can be used and run off standard 240V power supplies, making them ideal for small workshops and garages. For bigger industrial applications, three-phase hoists are used. They are more efficient and powerful. They run off 415V supplies and can handle bigger loads and more frequent cycles.

When selecting a hoist, it is important to consider the duty cycle. This is the length of time a hoist may operate before it must cool off to avoid overheating. For light duty, the cycle might be as little as 15%, which means the hoist can only operate for 9 minutes of a given hour. For more industrial type uses, the duty cycles are greater than 40%, and can often run continuously for an extended time. It’s important to align the duty cycle to your needs. If not, you may end up with a factor that is not causing delays on your production line as a result of overheating.

How to Keep Safe When Using Electric Chain Hoists

When operating hoists, there are important rules to follow to avoid huge risks and damage to others. Before making any lifts, ensure that each load is balanced and secured. Any unbalanced load risks crashing down, hitting workers, and tipping/failing the hoist. Attach the load to slings/chains that are rated to the weight involved, and regularly inspect supporting accessories to ensure they aren’t damaged or weak prior to the lift.

Never go over the max load/working weight of the hoist. This weight is clearly marked on the body of each hoist, and is the weight the lift structures and components have been built to handle. Hoists lift based on the weight added, and the loss of life is the outcome of not treating loads and weight with respect. Mistakes and deadly accidents can happen based on an incorrect load estimate. Below workers risk their life if weight is disrespected and loads are too much on the hoist.

While operating the hoist, the controls are used slowly and do not use sudden movements as these can shock the equipment. Electric chain hoists lift loads faster than manual hoists, but speed must always be controlled. During lift operations, you keep clear of the load path, and you make sure other workers are a safe distance away from the suspended load. Never walk or stand under a load as equipment can fail without warning. The consequences of being struck by falling loads are serious.

Considerations for Installation and Mounting

The mounting structures for electric chain hoists must be able to handle the S.W.L (safe working load) of the hoist, the dead weight of the hoist, and the dynamic loading factors. A 1-ton hoist usually requires a support structure or beam rated for 2 to 3 tons to compensate for shock loads and the forces from the lifting operations. You cannot just hang a hoist from a beam or structure. Inadequate support can lead to collapse and structural failure.

For operations that need horizontal load movement, a beam trolley that looks on an I-beam or a comparable track can have the hoist mounted on it. For lighter loads and infrequent use, the trolley can be a manual push type. For heavier loads and frequent movement, a motorised electric trolley is needed. With beam trolley system installations the beam needs to be load rated and all steel supporting works needs to be evaluated by engineers. This concern is more pronounced with older structures where the existing framework is not capable of supporting the added loads without some reinforcement.

Fixed mounting points need to be installed with a mounting plate and appropriate fasteners. Connections need to be checked regularly for tightness and the condition of the materials. From symptoms of hoist operations, rusted or loose bolts connected by vibration can happen with the passage of time, so maintenance schedules need to take that into consideration. You need to keep mounting hardware in check as part of your major pre-use inspections, and if there are issues you need to relay that to maintenance before continuing operations.

Inspection and Maintenance Hoist Structures

Chain hoists operate at their best and safest with regular scheduled inspection and maintenance. The hoist’s load chain should be closely examined for evidence of wear, stretch, or damage. The chain is kept well-lubricated and to maintenance standards with chain lubricants at intervals determined by the chain’s manufacturer. Lifting operations are in danger of failure if a chain has not been well-maintained and begins to wear without warning.

Motors and gears should be checked at a scheduled time for evidence of bump, grind, or heat cycles. Your brake’s function is of particular importance during a hoist cycle. Regularly lifting a load should be a part of your maintenance schedule. The load should stop immediately and the hoist should not lower. If this is not the case, the brake has a problem and the load is indicative of a more serious problem that needs to be examined by certified personnel.UK law states that lifting equipment must be examined by a qualified individual every six months if it lifts people, and every twelve months if it only lifts goods. These examinations must be logged and the log kept for health and safety inspectors. You ensure that all examinations are done on time and all defects are repaired before the equipment is put back to work. Using lifting equipment without examination certificates is a crime and insurance will not cover it.

Training and Competence

Electric chain hoist drivers and operators must be trained on the safe operation of the equipment they are going to use. Training should focus on load and weight estimation, safe slinging practices, understanding safe working loads, and recognizing unsafe conditions. An unsafe operator jeopardizes the safety of everyone around the lifting operation.

Never use electric hoists unless you have the proper instructions and demonstrated competency in their use. Most control pendants have up and down buttons and an emergency stop button, but there is more to an operation than just pressing buttons. You need to know how to stand safely during operations, how to give signals to other workers, and how to react to emergencies such as loss of power or failure of the equipment. If you need training on the use of lifting equipment and guidance on the safe use of equipment, you should find a qualified trainer who offers courses including theory and practical assessment.