Sealed Bearings
Piston seals for hydraulic cylinders
The most common fluids used in hydraulic systems are based on mineral oil. In recent years there has been a lot of attention to environmentally acceptable hydraulic fluids, but its use so far is limited, mainly due to its relatively high cost compared with mineral oil. In many cases, standard piston seals can be used in these fluids. fire resistant fluids such as water high based fluids, have applications in specific areas such as mining long wall and have led to the evolution of specialized labels, but the vast majority of applications using hydraulic mineral oil. Two main factors affecting the mineral oil-based systems are cost and losses.
This article discusses two issues Key: -
• The effect of forming tubes on the performance of the seal - the lowest cost tube can not give the desired performance
• The influence of the brush in gland exhaust
THE EFFECT OF THE FINAL SEAL TUBE PERFORMANCE
A meeting of a hydraulic cylinder piston is only part of the locking system. Your life will depend on several factors, one important one being the nature of the surface against which it is running. Cylinder hydraulic steel tubes generally have a surface finish that is produced in one of three ways: -
• Honing
• Roller-burnished
• drawing on a mandrel (DOM)
Hallite stamps have been aa significant out performance studies Double Action retainer, used both in a double action and single-acting form of examining the effect of the manufacturing of the tube and therefore the surface tube texture, in the performance of a typical twin-piston seal quality.
Manufacture of cylinder tube
Hydraulic pipes cylinder is usually made of steel is drawn over a mandrel (DOM). This process work hardens the material and give desirable mechanical properties. The surface final tube is obtained in one of three ways. In the refinement of the process tube is machined to obtain the required roundness and gave birth to tolerance and eliminate imperfections surface and then finished by grinding or honing internal. In scraping and burnishing roller-tube of the probe is again the interior mechanical (scraping) and crushed by the rollers on the machining head. More recently, drawing techniques have been developed so that the tube is considered ready for use in the state, as stated. This is known as a special smooth inside diameter (SSID) or 'smooth' tube.
In terms of cost of the tube over the ranking from most DOM SSID is cheap, roller polished and perfected. DOM tube SSID can be 30% cheaper than polished rollers, so that places of interest for the manufacturer of the cylinder are evident. However, the quality of these tubes can be an issue that could lead to premature seal failure.
The limitations of As-Drawn (SSID) tube
SSID tube has shown its limitations in its application, especially when the double seal of the piston is being driven under pressure. This can happen, for example, when the descent of a load is being controlled by the release of liquid from step total. The tube manufacturing process results in scoring as axial traction of the tube in the tube roll-polished and perfected, these defects are eliminated by the finish of the tube in a circumferential direction. These results may provide sites for the liquid axial reaction to erode over the seal face contact, especially when the seal is being driven under pressure. A further difficulty is that these defects are not detected by the usual methods of measuring surface finish.
THE INFLUENCE OF THE LEAK GLAND brush in
The collar seal a hydraulic cylinder system consists of a number of factors, including housing seal, rod seal, wipers, rod, rod bearing, hydraulic fluid and the bar itself. The rods are usually hard chrome and relatively consistent in the finish. The bar is cleaner the primary role of preventing external contamination reaching the rod seal and plain gland, and for this reason it is installed in the great Most hydraulic cylinders. However, this component was often overlooked in the laboratory testing alternative seals.
Numerous studies have been carried out on the factors affecting the performance of an alternative seal including surface finish to the face and the effects of pollution.
Hallite Boards conducted a series of tests where the performance of flight of five different pieces of work with a common rod polyurethane seal was examined. It demonstrates that Cleaning an important factor in controlling leakage of hydraulic cylinder gland. Single lip wipers can leak a lot higher than the seal itself without a wiper. This is the result of the lip to collect clean oil on the dipstick, which provides lubrication limit for closure. The use of double lip wiper dispersion reduces the level of a label in itself, but the danger of trapping pressure between the seal and wiper. A profile of double lip wiper has been developed, which minimizes the ring of oil on the dipstick collected by wiping lip, and also has a ventilation function to release the oil in the case an accumulation of pressure between the seal and wiper.
About the Author
Hallite Seals International are an ISO 9001 accredited manufacturer and provider of Hydraulic Seals and sealing solutions to the global fluid power industry. We operate in all five continents of the world, and work with a number of major international brands - renowned for their commitment to engineering excellence.
For over 100 years Hallite Seals International has been at the cutting edge of fluid power technology, manufacturing a wide range of rod / gland, piston, and static seals, as well as support and bearing components, for technically challenging applications, from a wide range of materials which include Polytetrafluoroethylene (PTFE), Polyurethane (AU), nitrile rubbers (NBR) and Fluoro-elastomers (FKM).
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