Electric Chain Hoist Motors and Controls
Electric chain hoists simplify heavy load handling. They lift materials like wire spools and provide precise positioning control for manufacturing operations.
Adding an electric chain hoist can save time and money on repetitive lifting tasks and reduce strain on workers. The best models also come with improved safety features compared to manual hoists.
Power
Electric chain hoists require much less power than manual varieties to operate, which means they can lift loads more quickly and efficiently. They also use fewer moving parts than their manual counterparts, allowing for better uniform motion control throughout operations and greater reliability.
Generally speaking, electric chain hoists can be powered by either single-phase or three-phase power sources. However, it’s important to check the supply voltage at your facility before finalizing which type of hoist to buy. Ensure consistent, sufficient amperage is available to avoid damage or loss of functionality.
An electric motor inside an electric chain hoist converts electrical energy into mechanical energy that then causes the load chain drum to rotate. In addition, it implements an electric and mechanical braking system that prevents the chain from falling off the load when the hoist isn’t in use. To keep these systems operating smoothly, it’s recommended to lubricate the chain and follow other maintenance instructions, such as those found in your inspection book. These measures add layers of safety and protection to your employees.
Motors
Motors are the driving force that turns an electric chain hoist’s gear system to lift and lower loads. They are available in both single-phase and three-phase designs that directly connect to AC power sources. While both are effective at revolving geared systems, three-phase motors generally operate more smoothly and offer a longer life expectancy.
The electric motor on an electric chain hoist can produce up to four times the lifting capacity of a manual chain hoist. This allows them to speed up work cycles and improve operational efficiency. They also help uphold physical ergonomics in the workplace by reducing heavy-lifting tasks that require excessive human effort.
To ensure optimal performance, an electric chain hoist needs to be paired with a quality power supply. This ensures consistent, sufficient amperage arrives at the motor. Additionally, the chain hoist requires a strong and durable sheave that can support its weight. These sheaves typically feature deep-groove pockets, heat-treated helical and spur electric chain hoist gears and friction clutches for long service. They’re designed to resist wear and tear in harsh environments as well.
Brakes
Whether it’s for precision payload weighing or simple hands free operation, the brakes that are used with an electric chain hoist play a vital role in making these remarkable machines more cost effective and reliable. They also offer a host of safety features to protect operators.
Motor brakes on a hoist act instantly when power is cut off even under full load. They are sized by the manufacturer per their hoist’s motor horsepower and are often referred to as fail safe.
Brake discs press against each other creating friction and stopping the hoist’s rotation. Single disc brakes are typically found on lighter weight hoists. Two disc systems use two metal discs that are pressed together by a powerful magnetic field when powered on but disengage as power is removed. They offer higher torque capabilities than single disc setups.
Controls
Modern electric chain hoists feature several additional controls to enhance safety and efficiency. Generally, they include a brake system that prevents the load from falling should power be cut. Some also have a motor brake, which is used to help position the load.
Some also come with an upper limit switch for positioning, which is installed as a final device preventing overwinding in emergency situations. The owner’s manual for these devices also includes a maintenance schedule that specifies when the upper and lower limit switches should be tested for proper functioning.
Some models have a remote control for operating equipment from up to 330 feet away. This can reduce the need for workers to be near a heavy load, protecting them from possible injury. They can also help reduce downtime and increase productivity by allowing the operator to complete tasks without a crane or other piece of equipment in sight. These units typically have a durable rubber cover to protect the switches from dirt and other debris. They also have a slim shape that allows them to fit comfortably in the hand.
Safety
While these hoists offer improved safety features over manual units, they still require proper use to prevent accidents and equipment damage. Specifically, supervisors electric chain hoist must ensure that the load is properly secured before hoisting. Also, they should never operate a hoist while people are present in the area of operation. Doing so poses a massive risk of injury to people and could damage equipment.
Similarly, operators should never exceed the machine’s specified safe working load (SWL) limits. This information can generally be found on the nameplate, and it should be read before operating the equipment. Also, excessive inching should be avoided as it can cause partial abrasion and damage to limit switches.
In addition, supervisors must ensure that the chain hoist is lubricated according to the manufacturer’s recommendations with high-quality products. They should also inspect the unit on a regular basis for signs of wear and tear that could lead to dangerous failures. They must also ensure that the power cable is plugged into a suitable outlet and that it’s of sufficient gauge and length.