Electric Chain Hoist
Electric chain hoists are valuable tools that improve load lifting operations in a variety of industries. They can save time and money for businesses.
One key consideration when choosing an electric hoist is its power requirements based on the capacity you need. This includes the voltage your site is wired to operate.
Power
Electric chain hoists are a great way to lift and move heavyweight items that would be impossible or difficult to carry by hand. They use chains to pull through sprockets on gear systems that turn to lift and lower loads in applications such as machine shops, fabricating plants, and auto mechanic shops. They also work in warehouses to move supplies and equipment. These general purpose hoists can withstand high temperatures and abrasive loads.
These devices operate on a regular 120V AC power supply to run their motors. The motor mechanism converts electrical energy into mechanical motion by arranging different sets of electromagnets between two concentric rings to create a rotational force on the load chain drum and trolley wheels. This enables the system to move the load up and down with precise control.
Most models feature an overload relay that prevents damage to the motor by detecting electric chain hoist abnormal speed, current, or voltage and shutting off power. They are also designed to stop automatically if the load is dropped below the rated capacity. Most units also feature a side magnetic brake device that brakes the load immediately when power is cut to prevent accidents.
These devices also have a push button station that allows workers to easily control the unit from ground-level. They are compatible with standard NEMA 3R push buttons that fit the operator’s thumb or two-fingered grip for single or dual-handed operation.
Design
Electric chain hoists are a popular choice for many applications that require a high level of precision and control. These motorized lifting devices are designed with the safety of workers in mind, and come equipped with features like overload protection, emergency stop controls, and more to protect personnel from accidents and equipment damage.
These hoists typically use between two and four times less power than their manual counterparts, helping businesses save on energy costs. Additionally, these hoists are often much easier to mount than manual models, and installation is quick and simple. This helps businesses recoup their initial investment in the hoist quickly and start saving on operational costs almost immediately.
The core of these hoists is a DC motor mechanism that converts electrical current into mechanical motion through an alternating arrangement of electromagnets on its armature. When the armature is activated, it produces a back-EMF that causes the rotor to rotate. This rotation causes the load chain to wrap around the rotor and transfer power to the gearing inside the drum, enabling lifting operations to begin.
Additional features of these hoists include safety slipping clutches for reliable overload protection and quick, easy electrical connections through their quick plug-type connectors. These hoists are also constructed with steel safety cages that help prevent workers from contacting moving parts or tripping over the chain while in operation.
Safety
Hoists are remarkable machines that make it possible to move a great deal of weight with relative ease. However, like all power equipment they require care and maintenance to ensure that they operate safely.
An electric chain hoist’s braking system is one of the most important safety features. Reputable manufacturers always include motor brakes to allow their customers to control their loads at all times. The brakes work by applying friction between mating surfaces to delay the movement of the load.
The motor brakes also act as an upper and lower limit switch to protect the hoist from abnormal usage damage. These are the same safety measures that also prevent electrical overloading and overheating.
All reputable manufacturers design their electric hoists to meet and exceed the latest Occupational Safety and Health Administration (OSHA) regulations. These regulations cover all aspects of safe hoist operation, including slinging and rigging requirements.
Ensure that the hoist is used in an area free of excessive humidity, dust or other pollutants. Hoists are susceptible to corrosion when exposed to these conditions. Also, it is a good idea to keep the workplace well demarcated using visible signs. This will help prevent people from unintentionally wandering into areas where hoists are in use. Hoists should be periodically inspected and maintained by an experienced professional to ensure that they are operating correctly and safely.
Maintenance
Electric chain hoists are electric chain hoist remarkable pieces of machinery that have made many industrial tasks much smoother, cost effective and safer. However, like any piece of equipment, it requires proper maintenance procedures in order to keep it functioning smoothly and avoiding the potential for malfunction.
Keeping the hoist clean is a must, as it can help prevent corrosion and prolong its lifespan. Regular cleaning and lubrication will ensure the smooth operation of the machine. Using the right kind of lubricant will also minimize friction, which can cause the chain to wear out and cause damage to other parts.
The brake system is another critical component of an electric hoist, as it prevents the load from falling if the power source fails. This feature is often achieved by a magnetic or mechanical brake, depending on the model. The brake system can also be reinforced by using a friction clutch.
The most common maintenance procedure for an electric chain hoist is to check the components and attachments for wear and tear. The chain and wire rope should be inspected for nicks, gouges, cracks, twist, birdcaging, and looseness or dislocation. In addition, the hook should be checked for kinking and distortion. The hoist should also be lubricated and checked for a properly seated limit guide groove group. A professional technician should conduct these inspections to ensure the safe operation of an electric chain hoist.
