How are overhead cranes powered? Power is transferred from the building supply to the crane runway and bridge crane control panel via cable festoons, conductor bars, or cable reels. The same components are then employed to power the hoist trolley across the bridge.
The crane and hoists are controlled by an operator using push button pendants or radio remote controls. All of these parts work together to allow the bridge and hoist to move over the weight. After the load has been lifted, the bridge crane is driven to its destination and the load is lowered using the push button pendant or radio remote control.
Every electrical delivery method to a crane has advantages and downsides. The sort of system you choose will be determined by your power requirements, power availability, crane system size, and the work environment.
One of the most common methods of electrifying and supplying power to a crane and hoist is through conductor bars (also known as power bars, figure eight bars, or hot bars). When compared to other power systems, a conductor bar uses a sliding shoe collector system, which eliminates most of the exposed conductor safety hazards while also supplying higher amperage power.
Most conductor bar electrification systems now have a cover to protect them from the elements. The conductor bar may or may not be insulated in some applications, but the most common types have insulated covers.
Components:
Conductor bar - The supply of incoming power and/or control along the runway or bridge is provided by the conductor bar.
Power feed - Incoming power is connected to the conductor bar through a power supply.
Collector - a device that collects electrical current from a conductor bar and sends it to a machine.
Brackets - a device that allows many hangers to be attached to a runway or bridge.
Hangers - Attach the conductor bar to the brackets with hangers.
End cover — a safety barrier at the conductor system's end.
Anchor clamp - a device that directs conductor movement during thermal expansion and contraction.
Advantages:
Conductor bar systems for overhead cranes are typically installed on the crane's runway systems or monorail cranes and can be used on both indoor and outdoor cranes. One of the most significant advantages of adopting a conductor bar system is that it may be used on runways with several bridges.
With a variety of brackets and hanger clamps, they're also highly cost-effective and simple to install. They're also great for low-headroom situations where cables can't dangle down, as well as systems with a curve or track switch.
Finally, conductor bars are ideal for crane configurations where future upgrades or extensions are a possibility. Because conductor bars are so easy to link together for installation, runway systems can be extended more easily and at a lower cost. Conductor bars are also ideal for ensuring power continuity in interlocking crane systems.
If you have a crane at your workplace, it should be inspected on a regular basis by someone who is professionally qualified to do so. All cranes should be inspected annually, according to OSHA regulations. Important crane components will deteriorate over time because of continuous use. This wear and tear can eventually result in crane failure or dangerous failure, putting your entire team or company at risk.
Routine crane inspections aid in spotting potential issues, which can then be remedied before irreparable or costly incidents occur. An inspector for cranes and lifting equipment should have experience with maintenance, servicing, modification, repair, and functional testing of cranes and lifting equipment.
No one is allowed to inspect cranes unless they have been adequately trained. Overhead crane inspection services are divided into four categories: initial, functional, frequent, and periodic.
An initial inspection is a documented visual inspection performed after the installation of a new crane or the modification of an existing crane. It will be conducted by an authorized person, who will thereafter provide a written report. The purpose of a functional test inspection is to see if any of the functional operational
mechanisms are malfunctioning. Valve, drain pump, and other components are examined for deterioration or leaking.
It's done on a daily or monthly basis to check for excessive component wear. This also verifies non-compliance with the manufacturer's guidelines. The hoist brake, load chains, and other components should receive special attention from the inspection. A crane in heavy use should be inspected at least once a week.
The frequency of periodic inspection is determined by the crane's use. Cranes that are used for both light and heavy work should be inspected once a year.
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