Hydraulic cylinders are components of hydraulic devices which are used in machinery. They enable the machines to move heavy work loads across a certain distance. Hydraulic cylinders are commonly found in vehicles like earth movers, road graders, tippers, garbage collectors and some cranes. Hydraulic cylinders are also used in factories and workshops where there is a need to lift or press with a significant amount of force. Therefore devices such as press machines and trap doors all have hydraulic cylinders. There is a distinction between commercially sold hydraulic cylinders and industrial hydraulic cylinders. Industrial hydraulic cylinders are custom made for specific applications in manufacturing industries. They often have specified dimensions and special coatings added to the steel. This makes industrial hydraulic cylinders much more expensive than off-the-shelf hydraulic cylinders.
The hydraulic cylinder is filled with hydraulic oil and it houses a piston which moves back and forth along its length. The piston is pushed or pulled by a piston arm that is in turn powered by a generator. The piston has rings and valves that allow it to slide along the hydraulic cylinder. Hydraulic cylinders endure tremendous forces that are transmitted through the oil by hydraulic pressure. Since the hydraulic cylinder is tightly sealed, it is able to efficiently direct force to work upon a heavy workload. Hydraulic cylinders are made of high stress steel. To avoid corrosion they are painted but the piston rods that are connected at their end are not painted since they are always under high stress.
For aesthetic purposes the piston rods may be coated with chromium. Industrial hydraulic cylinders are custom welded with bore sizes that fit into specified volumes of space. Hydraulic cylinders come in different sizes and features. They may be single stage for one directional function, or double stage for dual directional force. In the case of industrial hydraulic cylinders, there are options of multi stage cylinders as seen in earth movers that can operate with multiple functions. A hydraulic cylinder is usually connected to an oil reservoir that it draws from until the piston rod is pulled to full length. The hydraulic oil is routinely drained and replaced to avoid build up of impurities. The entire hydraulic apparatus is powered by DC current from standard automotive batteries.
There are options for AC powered hydraulic cylinders that are normally used for stand alone applications. The AC current may be supplied from a single phase or three-phase current. The hydraulic cylinder end is usually threaded or flanged to enable repair or routine maintenance to be carried out. As for the piston rod it is welded or threaded for fitting during installation of a hydraulic cylinder. Industrial hydraulic cylinders are welded on all ends since they don't have standard sizes and because they have to withstand higher forces. The piston rod interfaces with the bottom of the hydraulic cylinder at a point with a special seal to prevent outside contaminants from passing through. The inside of a hydraulic cylinder may be smoothly machined or it may be honed.
This article has been taken from http://www.ideamarketers.com/?articleid=3300449CFID=187323731CFTOKEN=51798306
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