Cylinders allow hydraulic systems to use linear motion and force without mechanical gears or levers by transferring 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 apps (agricultural machines, construction equipment, marine equipment). And, in comparison with pneumatic, mechanical or electric systems, hydraulics can be simpler, stronger, and offer greater power. For instance, Small Hydraulic Motor has about 10 times the power density of an motor unit of comparable size. Hydraulic cylinders can be found in an amazing array of scales to meet an array of application needs.
Selecting the right cylinder for the application is critical to attaining maximum performance and reliability. Which means taking into account several parameters. Fortunately, a variety of cylinder types, mounting techniques and “rules of thumb” are for sale 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 conclusion caps, and require no tie rods. Ram cylinders are simply what they sound like-the cylinder pushes straight ahead using very high pressure. Ram cylinders are used 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 less than an inch to many feet or even more. Bore diameters may range from an inch as much as greater than 24 in., and piston rod diameters range from .5 in. to a lot more than 20 in. In reality, however, the choice of stroke, bore and rod dimensions might 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 necessary to retain stability. Improving the diameter from the bore or piston rod is a great way to compensate 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 of the cylinder are perfect for straight line force transfer and avoiding wear. Common kinds 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 service, but the mounts produce a turning moment because the cylinder applies force to a load, increasing wear and tear. To avoid this, specify a stroke a minimum of so long as the bore size for side mount cylinders (heavy loading is likely to make short stroke, large bore cylinders unstable). Side mounts need 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 allow 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 used with rod-end attachments that also pivot. Clevis mounts may be used in almost any orientation and are generally recommended for short strokes and small- to medium-bore cylinders.
Operating conditions-Cylinders must match a particular application with regards to the level of pressure (psi), force exerted, space requirements imposed by machine design, and so on. But knowing the operating requirements is only half the challenge. Cylinders must also withstand high temperatures, humidity and even salt water for Hydraulic Directional Control Valve. 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. While 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 will not be adequate to handle synthetic fluid hydraulics. Polyurethane can also be incompatible rich in water-based fluids like water glycol.
Seals -This has become the most vulnerable element of Small Hydraulic System. Proper seals is effective in reducing friction and wear, lengthening service life, whilst the wrong form of seal can result in downtime and maintenance headaches.
Cylinder materials -The type of metal used 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, like 65-45-12 ductile iron for rod bearings, can offer a considerable 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 may be more durable compared to standard case-hardened carbon steel with chrome plating utilized 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]