Cylinders allow hydraulic systems to use linear motion and force without mechanical gears or levers by shifting the pressure from fluid via 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 can be simpler, stronger, and provides greater power. For example, Hydraulic Cylinder For Tractor has about ten times the power density of an electric motor of comparable size. Hydraulic cylinders can be found in an impressive variety of scales to meet a wide range of application needs.
Choosing the right cylinder for an application is crucial to attaining maximum performance and reliability. That means taking into consideration several parameters. Fortunately, a variety of cylinder types, mounting techniques and “rules of thumb” are available to help.
Three of the 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 the cylinder housing, to supply additional stability. Welded cylinders feature a heavy-duty welded cylinder housing with a barrel welded straight to the final caps, and require no tie rods. Ram cylinders are only whatever they sound like-the cylinder pushes straight ahead using high pressure. Ram cylinders are used 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 under an inch to a few feet or maybe more. Bore diameters may range from an inch as much as more than 24 in., and piston rod diameters range from .5 in. to more than 20 in. In practice, however, the option of stroke, bore and rod dimensions may 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 does mean increasing the quantity of tie rods required to retain stability. Increasing the diameter of the bore or piston rod is a perfect way to make amends for higher loads, but space considerations might 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 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-Very 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 provided that the bore size for side mount cylinders (heavy loading is likely to make short stroke, large bore cylinders unstable). Side mounts must 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 let 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 must be used with rod-end attachments which pivot. Clevis mounts may be used in almost any orientation and tend to be suitable for short strokes and small- to medium-bore cylinders.
Operating conditions-Cylinders must match a specific application regarding the quantity of pressure (psi), force exerted, space requirements imposed by machine design, and so on. But learning the operating requirements is just half the challenge. Cylinders also must withstand high temperatures, humidity and even salt water for Hydraulic Cylinder For Press. 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. When in doubt, assume operating conditions will be more rugged compared to what they appear initially.
Fluid type-Most hydraulics use a type of mineral oil, but applications involving synthetic fluids, like phosphate esters, require Viton seals. Yet again, Buna-N seals might not be adequate to handle synthetic fluid hydraulics. Polyurethane is additionally incompatible with higher water-based fluids like water glycol.
Seals -This is among the most vulnerable part of Single Acting Electro-Hydraulic Actuator. Proper seals can reduce friction and wear, lengthening service life, whilst the wrong kind of seal can result in downtime and maintenance headaches.
Cylinder materials -The type 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 most applications. But stronger materials, such as 65-45-12 ductile iron for rod bearings, provides a sizable performance rldvub for tough industrial tasks. The kind of piston rod material may be crucial in wet or high-humidity environments (e.g., marine hydraulics) where17-4PH stainless-steel might be more durable 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]