Cylinders allow hydraulic systems to utilize linear motion and force without mechanical gears or levers by transferring the pressure from fluid via 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 may be simpler, more durable, and provides greater power. As an example, Large Hydraulic Cylinder has about 10 times the power density of an electric motor of similar size. Hydraulic cylinders can be found in a remarkable variety of scales to meet an array of application requirements.
Choosing the proper cylinder to have an application is critical to attaining maximum performance and reliability. This means taking into account several parameters. Fortunately, a big selection of cylinder types, mounting techniques and “rules of thumb” are offered to help.
The three most typical 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 come with a heavy-duty welded cylinder housing with a barrel welded right to the conclusion caps, and require no tie rods. Ram cylinders are just the things they seem like-the cylinder pushes straight ahead using high pressure. Ram cylinders are used in heavy-duty applications and more often than not push loads instead of pull.
For all types of cylinders, the crucial measurements include stroke, bore diameter and rod diameter. Stroke lengths differ from lower than an inch to several feet or more. Bore diameters can range from an inch approximately 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. For example, space could be too limited for your ideal stroke length. For tie-rod cylinders, increasing the dimensions of the bore means increasing the number of tie rods needed to retain stability. Enhancing the diameter from the bore or piston rod is a perfect approach to make up for higher loads, but space considerations might not allow this, in which case 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 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-Simple to install and service, nevertheless the mounts generate a turning moment since the cylinder applies force to some load, increasing deterioration. To avoid this, specify a stroke a minimum of provided that the bore size for side mount cylinders (heavy loading tends to make short stroke, large bore cylinders unstable). Side mounts must 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 let 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 should be combined with rod-end attachments that also pivot. Clevis mounts can be used in almost any orientation and tend to be appropriate for short strokes and small- to medium-bore cylinders.
Operating conditions-Cylinders must match a certain application regarding the amount of pressure (psi), force exerted, space requirements imposed by machine design, and the like. But learning the operating requirements is simply half the challenge. Cylinders must also withstand high temperatures, humidity and also salt water for Vane Type Hydraulic Pump. Wherever temperatures typically rise to greater 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 what they appear at first.
Fluid type-Most hydraulics use a form of mineral oil, but applications involving synthetic fluids, including phosphate esters, require Viton seals. Once again, Buna-N seals may not be adequate to take care of synthetic fluid hydraulics. Polyurethane is additionally incompatible rich in water-based fluids including water glycol.
Seals -This has become the most vulnerable element of Hydraulic Power Packs. Proper seals is effective in reducing friction and wear, lengthening service life, as the wrong form of seal can lead to downtime and maintenance headaches.
Cylinder materials -The sort of metal utilized for cylinder head, base and bearing can create 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 the majority of applications. But stronger materials, including 65-45-12 ductile iron for rod bearings, can offer a sizable performance rldvub for tough industrial tasks. The kind of piston rod material may be important in wet or high-humidity environments (e.g., marine hydraulics) where17-4PH stainless-steel could be more durable compared to 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