Cylinders allow hydraulic systems to use 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 with pneumatic, mechanical or electric systems, hydraulics could be simpler, stronger, and provides greater power. For example, 100 Ton Telescopic Hydraulic Cylinder has about ten times the power density of an motor unit of comparable size. Hydraulic cylinders are also available in an impressive variety of scales to meet a variety of application requirements.
Choosing the proper cylinder for an application is critical to attaining maximum performance and reliability. This means taking into consideration 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 outside the cylinder housing, to provide additional stability. Welded cylinders feature a heavy-duty welded cylinder housing having a barrel welded straight to the end 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 employed in heavy-duty applications and typically push loads instead of pull.
For all types of cylinders, the crucial measurements include stroke, bore diameter and rod diameter. Stroke lengths vary from lower than an inch to a few feet or even more. Bore diameters can range from an inch as much as a lot more than 24 in., and piston rod diameters range from .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 instance, space could be too limited for the ideal stroke length. For tie-rod cylinders, increasing the dimensions of the bore means increasing the amount of tie rods required to retain stability. Improving the diameter of the bore or piston rod is an ideal way to compensate for higher loads, but space considerations may well not allow this, whereby multiple cylinders is usually necessary.
Mounting methods also play a vital role in cylinder performance. Generally, fixed mounts on the centerline from the cylinder are ideal 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-Easy to install and repair, however the mounts create a turning moment as the cylinder applies force to your load, increasing deterioration. To prevent 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 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 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 ought to be used in combination with rod-end attachments which pivot. Clevis mounts can be utilized in any orientation and are generally appropriate 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 forth. But understanding the operating requirements is simply half the challenge. Cylinders should also withstand high temperatures, humidity as well as salt water for Hydraulic Valves Directional Control. 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 than they appear at first.
Fluid type-Most hydraulics use a form of mineral oil, but applications involving synthetic fluids, such as phosphate esters, require Viton seals. Once again, Buna-N seals might not be adequate to take care of synthetic fluid hydraulics. Polyurethane can also be incompatible with higher water-based fluids including water glycol.
Seals -This is among the most vulnerable part of Dump Truck Hydraulic Piston. Proper seals is effective in reducing friction and wear, lengthening service life, as the wrong type of seal can cause 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, that is adequate for the majority of applications. But stronger materials, like 65-45-12 ductile iron for rod bearings, provides a substantial 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 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]draulic.com