Cylinders allow hydraulic systems to use linear motion and force without mechanical gears or levers by transferring the pressure from fluid through a piston to begin operation. Hydraulic cylinders are at work in both industrial applications (hydraulic presses, cranes, forges, packing machines), and mobile applications (agricultural machines, construction equipment, marine equipment). And, in comparison to pneumatic, mechanical or electric systems, hydraulics can be simpler, stronger, and provides greater power. As an example, Hydraulic Ram Pump has about ten times the power density of an electric motor of similar size. Hydraulic cylinders are also available in an amazing array of scales to meet an array of application needs.
Selecting the right cylinder to have an application is critical to attaining maximum performance and reliability. This means considering several parameters. Fortunately, a big selection of cylinder types, mounting techniques and “rules of thumb” are offered to help.
Three of the most frequent cylinder configurations are tie-rod, welded and ram styles. Tie-rod cylinders use high-strength threaded steel tie-rods, typically on the away from the cylinder housing, to supply additional stability. Welded cylinders feature a heavy-duty welded cylinder housing using a barrel welded directly to the conclusion caps, and require no tie rods. Ram cylinders are just the things they seem like-the cylinder pushes straight ahead using very high pressure. Ram cylinders are employed in heavy-duty applications and more often than not push loads as opposed to pull.
For all sorts of cylinders, the crucial measurements include stroke, bore diameter and rod diameter. Stroke lengths change from lower than an inch to a few feet or more. Bore diameters may range from an inch up to greater than 24 in., and piston rod diameters range between .5 in. to more than 20 in. In practice, however, the choice of stroke, bore and rod dimensions could be limited by environmental or design conditions. As an example, space could be too limited for your ideal stroke length. For tie-rod cylinders, increasing the dimensions of the bore means increasing the amount of tie rods needed to retain stability. Improving the diameter of the bore or piston rod is a great way to compensate for higher loads, but space considerations may not allow this, whereby multiple cylinders may be required.
Mounting methods also play a crucial role in cylinder performance. Generally, fixed mounts on the centerline of the cylinder are perfect for straight line force transfer and avoiding wear. Common varieties of mounting include:
Flange mounts-Very strong and rigid, but have little tolerance for misalignment. Experts recommend cap end mounts for thrust loads and rod end mounts where major loading puts the piston rod in tension. Side-mounted cylinders-Very easy to install and repair, but the mounts create a turning moment since the cylinder applies force to a load, increasing deterioration. To avoid this, specify a stroke at least so long as the bore size for side mount cylinders (heavy loading tends to make short stroke, large bore cylinders unstable). Side mounts need to be well aligned as well as the load supported and guided.
Centerline lug mounts -Absorb forces on the centerline, but require dowel pins to secure the lugs to avoid movement at higher pressures or under shock conditions. Pivot mounts -Absorb force on the cylinder centerline and allow the cylinder change alignment in one plane. Common types include clevises, trunnion mounts and spherical bearings. As these mounts allow a cylinder to pivot, they ought to be used in combination with rod-end attachments that also pivot. Clevis mounts can be used in every orientation and are generally recommended for short strokes and small- to medium-bore cylinders.
Operating conditions-Cylinders must match a certain application with regards to the amount of pressure (psi), force exerted, space requirements imposed by machine design, and the like. But understanding the operating requirements is simply half the process. Cylinders must also withstand high temperatures, humidity as well as salt water for Air Hydraulic Transferring Pump. Wherever temperatures typically rise to more than 300° F, standard Buna-N nitrile rubber seals may fail-choose cylinders with Viton synthetic rubber seals instead. If in doubt, assume operating conditions could be more rugged than they appear at first glance.
Fluid type-Most hydraulics use a type of mineral oil, but applications involving synthetic fluids, like phosphate esters, require Viton seals. Yet again, Buna-N seals will not be adequate to deal with synthetic fluid hydraulics. Polyurethane is also incompatible with high water-based fluids including water glycol.
Seals -This is probably the most vulnerable aspect of Black Hydraulic Sae Rubber Hose. Proper seals is effective in reducing friction and wear, lengthening service life, while the wrong type of seal can cause downtime and maintenance headaches.
Cylinder materials -The type of metal used for cylinder head, base and bearing can make a significant difference. Most cylinders use SAE 660 bronze for rod bearings and medium-grade carbon steel for heads and bases, which can be adequate for many applications. But stronger materials, such as 65-45-12 ductile iron for rod bearings, can offer a sizable performance rldvub for tough industrial tasks. The type of piston rod material could be essential in wet or high-humidity environments (e.g., marine hydraulics) where17-4PH stainless might be more durable compared to the standard case-hardened carbon steel with chrome plating employed for most piston rods.
Yongxiang Hydraulic Equipment Co., Ltd locates in Yangzhou, CN, and it covers an area of 143,500 square feet. Winning customer trust with innovation, Yongxiang has been aiming to provide customers with safe and reliable hydraulic products, services, on-time delivery, and customer satisfaction while ensuring employee safety, fostering employee relations and driving efficiency improvements.
Jiangsu Yongxiang Hydraulic Equipment Co. Ltd
Factory: Wujian Industrial Park, Jiangdu District, Yangzhou, CN
Office: 3107# No.2 Building, Global Financial Center, Wenchang East Road, Yangzhou, CN
E-mail: [email protected]