Cylinders allow hydraulic systems to apply linear motion and force without mechanical gears or levers by transferring the pressure from fluid by way of 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, in comparison to pneumatic, mechanical or electric systems, hydraulics may be simpler, stronger, and offer greater power. As an example, Eu Standard Hydraulic Cylinder has about 10 times the power density of an electric motor of similar size. Hydraulic cylinders are also available in an amazing array of scales to meet a variety of application needs.
Choosing the proper cylinder for an application is critical to attaining maximum performance and reliability. That means considering several parameters. Fortunately, a variety of cylinder types, mounting techniques and “rules of thumb” are offered to help.
The three 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 offer additional stability. Welded cylinders feature a heavy-duty welded cylinder housing with a barrel welded straight to the end caps, and require no tie rods. Ram cylinders are only whatever they sound like-the cylinder pushes straight ahead using extremely high pressure. Ram cylinders are employed in heavy-duty applications and typically push loads instead of pull.
For all sorts of cylinders, the crucial measurements include stroke, bore diameter and rod diameter. Stroke lengths differ from under an inch to several feet or maybe more. Bore diameters can vary from an inch as much as greater than 24 in., and piston rod diameters vary 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 may be too limited for your ideal stroke length. For tie-rod cylinders, increasing the dimensions 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 an ideal method to compensate for higher loads, but space considerations may not allow this, whereby multiple cylinders may be needed.
Mounting methods also play a crucial role in cylinder performance. Generally, fixed mounts on the centerline from the cylinder are best for straight line force transfer and avoiding wear. Common kinds 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, nevertheless the mounts produce a turning moment since the cylinder applies force to some load, increasing damage. To avert this, specify a stroke at least so long as the bore size for side mount cylinders (heavy loading has a tendency to make short stroke, large bore cylinders unstable). Side mounts need 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 utilized in any orientation and are generally suitable for short strokes and small- to medium-bore cylinders.
Operating conditions-Cylinders must match a certain application regarding the level of pressure (psi), force exerted, space requirements imposed by machine design, and so on. But learning the operating requirements is just half the task. Cylinders should also withstand high temperatures, humidity and also salt water for Double Action Hydraulic Oil Cylinder. 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. If in doubt, assume operating conditions may well be more rugged compared to they appear at first.
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 will not be adequate to deal with synthetic fluid hydraulics. Polyurethane is additionally incompatible with high water-based fluids such as water glycol.
Seals -This is among the most vulnerable part of Quality Hydraulic Hose. Proper seals is able to reduce friction and wear, lengthening service life, while the wrong kind of seal can lead to downtime and maintenance headaches.
Cylinder materials -The kind of metal employed 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, such as 65-45-12 ductile iron for rod bearings, can provide a considerable performance rldvub for tough industrial tasks. The kind of piston rod material could be important in wet or high-humidity environments (e.g., marine hydraulics) where17-4PH stainless steel may be more durable than the standard case-hardened carbon steel with chrome plating used 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]