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 with pneumatic, mechanical or electric systems, hydraulics may be simpler, stronger, and offer greater power. As an example, Axial Hydraulic Motor has about ten times the power density of an electric motor of similar size. Hydraulic cylinders can be found in an amazing variety of scales to meet a wide range of application requirements.
Choosing the proper cylinder to have an application is essential to attaining maximum performance and reliability. That means taking into consideration several parameters. Fortunately, an assortment of cylinder types, mounting techniques and “rules of thumb” are for sale to help.
The three most common cylinder configurations are tie-rod, welded and ram styles. Tie-rod cylinders use high-strength threaded steel tie-rods, typically on the outside of the cylinder housing, to provide additional stability. Welded cylinders include a heavy-duty welded cylinder housing having a barrel welded straight to the final caps, and require no tie rods. Ram cylinders are only the things they sound like-the cylinder pushes straight ahead using extremely high pressure. Ram cylinders are used in heavy-duty applications and almost always push loads rather than pull.
For all types of cylinders, the crucial measurements include stroke, bore diameter and rod diameter. Stroke lengths vary from under an inch to many feet or maybe more. Bore diameters can vary from an inch up to more than 24 in., and piston rod diameters range between .5 in. to a lot more than 20 in. In practice, however, deciding on a stroke, bore and rod dimensions might be limited by environmental or design conditions. For instance, space could be too limited for your ideal stroke length. For tie-rod cylinders, increasing how big the bore also means increasing the quantity of tie rods necessary to retain stability. Enhancing the diameter from the bore or piston rod is an ideal way to compensate for higher loads, but space considerations may well not allow this, in which case multiple cylinders is usually necessary.
Mounting methods also play a crucial role in cylinder performance. Generally, fixed mounts on the centerline from the cylinder are perfect for straight line force transfer and avoiding wear. Common varieties of mounting include:
Flange mounts-Quite 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-Simple to install and service, however the mounts generate a turning moment because the cylinder applies force to some load, increasing damage. To avoid this, specify a stroke at least so long as the bore size for side mount cylinders (heavy loading is likely to make short stroke, large bore cylinders unstable). Side mounts have 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 prevent movement at higher pressures or under shock conditions. Pivot mounts -Absorb force on the cylinder centerline and allow the cylinder change alignment in just one plane. Common types include clevises, trunnion mounts and spherical bearings. As these mounts allow a cylinder to pivot, they should be used with rod-end attachments that also pivot. Clevis mounts may be used in almost any orientation and are generally recommended for short strokes and small- to medium-bore cylinders.
Operating conditions-Cylinders must match a certain application in terms of the amount of pressure (psi), force exerted, space requirements imposed by machine design, and so on. But knowing the operating requirements is only half the challenge. Cylinders also must withstand high temperatures, humidity as well as salt water for Rexroth Hydraulic Pump. Wherever temperatures typically rise to a lot more than 300° F, standard Buna-N nitrile rubber seals may fail-choose cylinders with Viton synthetic rubber seals instead. While in doubt, assume operating conditions may well be more rugged than they appear at first.
Fluid type-Most hydraulics use a type of mineral oil, but applications involving synthetic fluids, like phosphate esters, require Viton seals. Once again, Buna-N seals will not be adequate to handle synthetic fluid hydraulics. Polyurethane is additionally incompatible rich in water-based fluids like water glycol.
Seals -This is among the most vulnerable part of Factory Hydraulic Cylinder Piston. Proper seals is able to reduce friction and wear, lengthening service life, whilst the wrong form of seal can cause downtime and maintenance headaches.
Cylinder materials -The kind 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, that is adequate for the majority of applications. But stronger materials, like 65-45-12 ductile iron for rod bearings, provides a considerable performance rldvub for tough industrial tasks. The kind of piston rod material may be essential in wet or high-humidity environments (e.g., marine hydraulics) where17-4PH stainless might be stronger compared to 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]