Ironworker is a class of machines that can shear, notch, and punch holes in steel plate. Modern systems use hydraulic rams powered by a heavy alternating current electric motor. High strength carbon steel blades and dies of various shapes are used to work the metal. The hydraulic ironworker machine itself is made of very heavy steel to handle the enormous force that can be generated during use. Ironworkers are rated according to the force they can generate in tons; ratings usually start at 20 tons and go as high as 150 tons. And a hydraulic cylinder produces linear motion and force by using pressurized hydraulic fluid. Industrial machines powered by hydraulic cylinders are able to form metals or other materials at a very high force with a relatively small supply of highly pressurized fluid.
The simplest hydraulic systems in ironworker machine consist of two pistons and a fluid-filled pipe. Pistons used in hydraulic systems are made in one, two, or three pieces depending on the speed and force required by the machine. One piece of heavy construction machinery uses up to eight hydraulic cylinders that may need as much as 100 gallons of oil. Water hydraulic systems use water as the fluid for the hydraulic cylinder rather than oil. Although water is less expensive than oil, as well as non-polluting, water's low viscosity and poor lubrication qualities require a system designed exclusively for water hydraulics.
Saturday, January 19, 2013
Sunday, January 13, 2013
The Operation about Rotary Screw Compressor and its Application
Rotary screw compressor is a form of air compressor. It is larger, more complex and more expensive than the models kept by most private workshops. In most cases, it is a non-portable unit used to supply compressed air for many industrial purposes. Rotary screw compressors use two meshing helical screws, known as rotors, to compress the gas. In a dry running rotary screw compressor, timing gears ensure that the male and female rotors maintain precise alignment. In an oil-flooded rotary screw compressor, lubricating oil bridges the space between the rotors, both providing a hydraulic seal and transferring mechanical energy between the driving and driven rotor. Gas enters at the suction side and moves through the threads as the screws rotate. The meshing rotors force the gas through the compressor, and the gas exits at the end of the screws.
Typically, they are used to supply compressed air for general industrial applications. Trailer mounted diesel powered units are often seen at construction sites, and are used to power air operated construction machinery. In an oil-free compressor, the air is compressed entirely through the action of the screws, without the assistance of an oil seal. Oil-free compressors are used in applications where entrained oil carry-over is not acceptable, such as medical research and semiconductor manufacturing. On the other hand, in an oil-flooded rotary screw compressors, oil is injected into the compression cavities to aid sealing and provide cooling sink for the gas charge. It is usual for some entrained compressor oil to carry over into the compressed gas stream downstream of the compressor. In many applications, this is rectified by coalescer/filter vessels.
Thursday, January 10, 2013
Clean Your Backyard by Using High Pressure Washers
Pressure washing can be a quick, easy way to clean your car, driveway, deck or siding. However, the powerful stream of water can also inflict damage if not handled properly. By learning a few techniques and principles, you'll get the job done more quickly and won't risk harming your home or family in the process. Pressure washers can generate significantly more water pressure than a garden hose. In fact, most domestic pressure washers available for home use actually utilize your garden hose and its water supply. A pressure washer can increase your garden hose's pressure by 15 to 50 times, or more. Not only does this increased pressure help clean better, but it also cuts down on the amount of water you use.
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