The Electric Hoist Industry
The electric hoist market has been thriving over the past few years. In recent years, Asia Pacific has dominated the global electric hoist market, and is expected to do so until 2025. The region’s robust economic growth and population growth are driving the industry’s size, and several residential construction projects are underway in many APAC countries. In addition, government initiatives to upgrade public infrastructure in APAC nations will continue to push product demand.
Load chain is the lifting medium
An electric hoist is a mechanical device that suspends an object over a supporting structure, such as a fixed or movable beam. Once the load has been placed on the hoist, a worker switches on the motor. A brake is integrated into the motor and is responsible for holding the driven load and stopping the motor when it reaches a halt. During vertical displacement, the break releases the power supply.
The lifting medium of an electric hoist is a chain or wire that is attached to a rotating arm. These machines are mobile and are guided by rails attached to the ceilings of industrial buildings. They can be manually operated or electrically powered and are used in construction and steel industries, as well as in airports, mines, and mechanical workshops. They are often used for loading and unloading extremely heavy materials.
Electric chain hoists are durable products. However, high-duty-cycle operation creates heat in the mechanical components, which can lead to failure and downtime. To ensure the safety of workers and employees, electric chain hoists are required to have warning labels on their equipment. In addition, they must have adequate electrical connections during operation. If the electrical current in the area is not regulated, the hoist can cause a spark and ignite the objects in its path.
Another type of electric hoist is the wire rope hoist. These hoists are also popular with industrial users, as they use wire rope as the lifting medium. Wire rope hoists are generally more expensive than electric chain hoists, which are used for light-duty applications. They are also available in a variety of configurations and lighter capacities. Chain hoists are also more durable than wire rope and usually offer the same duty cycle as their wire rope counterparts.
Induction motor for electric hoists are used in lifting equipment, primarily in construction and manufacturing applications. They have advantages over conventional, synchronous-type motors, including a lower starting torque. This allows them to be started without overheating the machinery. Unlike conventional synchronous-type motors, these also prevent overspeeding in the event of failure of braking means. Further, they offer additional braking power with minimal extra electrical circuitry.
The electrical circuit of a single-phase motor is similar to that shown in FIG. 4, with the exception of a capacitor 27 across one motor phase. A capacitor in this circuit can be selected based on the impedance characteristics of the motor. An open capacitor may yield a resonant circuit condition. Unlike the resonant circuit of the single-phase motor, the prior-art motor does not reverse when a phase is lost. The torque that results continues in the lifting direction. This may cause damage to the hoist and the load to drop.
A typical hoist using the instant invention would resemble FIG. 1, but would lack the load brake. In addition to the load brake, the electrical circuit of FIG. 3 is similar to that of FIG. 1. The only difference is the type of single-phase motor used. In this case, the limit switch is not plugged. In addition, the lift control switch would be energized by the raise control switch 14. Then, a separate motor 17 is connected to the power circuit 16 and the lift contactor closes the power circuit 16. The hook is raised by the rotation of the winding means 7 in the motor.
While single-phase motors do not offer reverse-while-running capability, this feature is important in a hoist. It is vital for safety reasons that the speed of the motor should be consistent with the speed of the load. If the hoist is not able to stop, the operator can release the load through the clutching means. After the load is released, the motor torque acts to release the frictional surfaces.
The rated capacity of an electric hoist is the maximum weight that the hoist can safely lift before buckling. This value is dependent on a number of factors, including the motor capacity, the rigidity of the electric hoist assembly, and the strength of the wire rope or load chain. The working load limit, on the other hand, is the maximum weight that an electric hoist can safely lift. The working load limit is determined by multiplying the rated capacity by a safety factor that depends on the construction and surroundings of the hoist.
The safety factor of an electric hoist should be liberal, and a licensed structural engineer should review the specifications before installation. Additionally, electrical installations should be performed by licensed electricians, following the latest edition of the National Electrical Code. Finally, the operator should be well-versed in local, state, and national electrical codes. Fortunately, the latest versions of hoist safety standards are very high. To prevent any injury or damage to property, a wire rope hoist must comply with these regulations.
While the electric chain hoist’s safety mechanism may be inadequate in certain situations, the overall concept of a safety mechanism is sound and essential to keep employees safe. Overloading can be extremely dangerous, and electrical chain hoists are designed to prevent overloading by disengaging the chain at a preset torque. Moreover, many modern electric hoists are equipped with safety cut out switches to prevent overloading. With this safety mechanism, an electric hoist can handle all types of materials without causing any harm to the user.
An electric chain hoist’s safety mechanism includes limit switches and a self-limiter. This mechanism can be set to shut off the hoist when the hook reaches its highest or lowest point. Most electric chain hoists have two types of limit switches: paddle type and screw type. A paddle type limit switch involves a hook on the chain that contacts a paddle switch. This contacts the switch and stops the motion.
Electric hoists can be single or double speed. Single speed is usually appropriate for most applications, while double speed is used when precise positioning is required. Two-speed models allow the user to adjust the speed between zero and full speed to suit the job. The last choice may be ideal for assembly workshops and other places where high lifting speeds are necessary. The single speed type is often referred to as a single speed electric hoist.
To ensure a safe working environment, the operators of electric hoists must understand and follow all safety regulations for the equipment. For example, workers are not allowed to operate the electric hoist unless they are specially trained to do so. The electric source must be turned off after each use. Inflammable materials, such as wood, may spark during the operation. In order to ensure the safety of the work area, it is crucial to regularly check electric hoists to prevent any potential hazards.
The lifting height of electric hoists is highly important, and the selection of an electric hoist must be made with care. For example, a conventional electric hoist has a working height of 6 to 30 meters. But if you’re using the hoist for special occasions, you may want to go for a non-standard height. To avoid such problems, you can also order a customized height, including non-standard lifting heights.
Choosing an electric hoist should also consider how quickly you need it to move loads. A standard rule is 8 start/stop cycles per cycle. Ideally, a hoist should be able to handle up to two tons of weight and lift up to fifteen feet of load. A good choice would also come with a 230V 3-phase operation and H4 service classification. However, this example assumes a nominal voltage, which will be affected by high temperatures.
Brands of electric hoists
If you are in the market for an electric chain hoist, you’ll find several top-quality brands. The top brands include Jet, Strongway, CM, Budgit, and Elephant Lifting. Each brand is known for providing a high level of quality and durability. Each hoist has a long history of service, and each offers a wide range of products. Take a look at our product comparison chart to find the best electric chain hoist for your needs.
A good electric hoist is not only functional and easy to use, but it is also quieter than a manual or hydraulic hoist. It is kinder to your employees’ hearing, and it can help reduce worker stress while lifting heavy items. You can even use electric hoists in smaller machine shops, resulting in a larger space in the shop. There are many brands to choose from, so take some time to do your research to determine which one will suit your needs best.
Electric hoists come in two basic styles: overhead hoist lift systems and portable hoist units. Portable models are lightweight, portable, and are a great option for light to medium-duty applications. Overhead electric hoists, on the other hand, are usually mounted on a ceiling and can lift up to eighty tons. Some hoisting systems integrate several devices, including an overhead chain hoist and an overhead wire rope one.
Columbus McKinnon is a world-class manufacturer of electric chain hoists, including Lodestar, Powerstar, ShopStar, and Valustar. Based in Springfield, Ohio, this company strives to provide high quality and reliable equipment to businesses across North America. The company also has service and parts centers throughout the country. You can trust R&M’s experience to deliver quality and a wide range of features.