Cylinders allow hydraulic systems to apply linear motion and force without mechanical gears or levers by shifting the pressure from fluid through a piston to the point of 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, when compared with pneumatic, mechanical or electric systems, hydraulics could be simpler, more durable, and provides greater power. For instance, Single Acting Hydraulic Ram has about 10 times the power density of an electric motor of similar size. Hydraulic cylinders can be found in an impressive array of scales to meet a variety of application requirements.
Choosing the right cylinder for the application is crucial to attaining maximum performance and reliability. Which means considering 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 away from the cylinder housing, to offer additional stability. Welded cylinders come with a heavy-duty welded cylinder housing with a barrel welded right to the final caps, and require no tie rods. Ram cylinders are just whatever they appear to be-the cylinder pushes straight ahead using very high pressure. Ram cylinders are utilized in heavy-duty applications and almost always push loads as opposed to pull.
For all sorts of cylinders, the crucial measurements include stroke, bore diameter and rod diameter. Stroke lengths vary from under an inch to several feet or maybe more. Bore diameters can vary from an inch up to greater than 24 in., and piston rod diameters range from .5 in. to greater than 20 in. In reality, however, deciding on a stroke, bore and rod dimensions could be limited by environmental or design conditions. For example, space could be too limited for your ideal stroke length. For tie-rod cylinders, increasing the size of the bore also means increasing the amount of tie rods necessary to retain stability. Increasing the diameter from the bore or piston rod is a great approach to make amends for higher loads, but space considerations might 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 in the cylinder are best 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 repair, nevertheless the mounts generate a turning moment as the cylinder applies force to some load, increasing wear and tear. To avert this, specify a stroke a minimum of provided that 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 and also 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 enable the cylinder change alignment in just one plane. Common types include clevises, trunnion mounts and spherical bearings. Since these mounts allow a cylinder to pivot, they must be used in combination with rod-end attachments that also pivot. Clevis mounts can be used in every orientation and are generally suitable for short strokes and small- to medium-bore cylinders.
Operating conditions-Cylinders must match a particular application in terms of the level of pressure (psi), force exerted, space requirements imposed by machine design, and so forth. But understanding the operating requirements is just half the challenge. Cylinders also must withstand high temperatures, humidity as well as salt water for Manual Hydraulic Pumps. 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 compared to they appear initially.
Fluid type-Most hydraulics use a kind of mineral oil, but applications involving synthetic fluids, such as phosphate esters, require Viton seals. Yet again, Buna-N seals may not be adequate to deal with synthetic fluid hydraulics. Polyurethane can also be incompatible with higher water-based fluids like water glycol.
Seals -This is among the most vulnerable aspect of Welded Hydraulic Cylinder Piston. Proper seals can reduce friction and wear, lengthening service life, as the wrong type of seal can lead to downtime and maintenance headaches.
Cylinder materials -The type of metal utilized 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, including 65-45-12 ductile iron for rod bearings, can provide a sizable performance rldvub for tough industrial tasks. The type of piston rod material can be important in wet or high-humidity environments (e.g., marine hydraulics) where17-4PH stainless may be stronger than 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