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QME is a world leader in supplying services to the mining industry. QME supply new and re-manufactured underground and open pit mining equipment. to the mining industry world wide. Our aim is to supply a customer service of reliability and satisfaction.
Our 15,000 ft2 rebuild facility is located on the east coast of Ireland near Navan, Co. Meath and has been in operation since 1985. Throughout this time Quarry & Mining Equipment Ltd. has built a solid reputation for top-quality standards in remanufacturing and customer support.
Contact name is John Murnin.
Apprentices (Note: we have only begun recording apprentice names here since July 2012, cp12b, so there may be others who attended prior to that date and are not listed here)
In construction plant fitting, there are 2 contexts for quenching:
In Diesel Fuel Injection:
To quench a flame means to put it out. For example, you would use a fire extinguisher to quench a fire.
In the context of combustion in an engine, quenching means that when atomised fuel enters a cold engine, the low temperatures cause the atomised fuel particles to condense on the relatively cool cylinder walls.
As we know, the only part of any fuel that burns is the vapour, so fuel that has condensed on to a cold cylinder wall does not produce vapour and will not burn.
In Electrics and Electronics:
The 86/85 circuit is essentially a coil of wire which we energise to make an electromagnet. We then use this magnet to close the contacts in the 30/87 circuit, causing the relay to close the circuit it serves.
Because 86/85 is a coil of wire, every time we open the circuit, the magnetic field around the coil of wire will collapse and induce a voltage spike. In order to prevent that spike from damaging any electronics in the circuit, we fit a diode across the 86/85 contacts. There are many names for this diode, and one of them is a 'quenching diode'.
You can think of it as the baseline current required to have the device ready to perform its task.