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 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 with pneumatic, mechanical or electric systems, hydraulics can be simpler, more durable, and offer greater power. As an example, Nachi Hydraulic Motor has about 10 times the power density of an motor unit of similar size. Hydraulic cylinders are also available in an amazing variety of scales to meet an array of application needs.
Choosing the right cylinder for the application is critical to attaining maximum performance and reliability. That means taking into account several parameters. Fortunately, an assortment of cylinder types, mounting techniques and “rules of thumb” are for sale to help.
The 3 most typical 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 come with a heavy-duty welded cylinder housing with a barrel welded directly to the conclusion caps, and require no tie rods. Ram cylinders are only what they seem like-the cylinder pushes straight ahead using very high pressure. Ram cylinders are used in heavy-duty applications and almost always 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 a few feet or even more. Bore diameters can vary from an inch approximately more than 24 in., and piston rod diameters vary from .5 in. to a lot more than 20 in. In practice, however, the option of stroke, bore and rod dimensions could be limited by environmental or design conditions. As an example, space could be too limited for your ideal stroke length. For tie-rod cylinders, increasing the size of the bore means increasing the quantity of tie rods required to retain stability. Enhancing the diameter in the bore or piston rod is a great approach to make amends for higher loads, but space considerations may well not allow this, in which case multiple cylinders is usually necessary.
Mounting methods also play a crucial 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-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-Easy to install and repair, nevertheless the mounts create a turning moment because the cylinder applies force to your load, increasing wear and tear. To avoid 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 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. Because these mounts allow a cylinder to pivot, they ought to be combined with rod-end attachments that also pivot. Clevis mounts can be used in almost any orientation and tend to be recommended 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 forth. But knowing the operating requirements is simply half the task. Cylinders should also withstand high temperatures, humidity as well as salt water for Hydraulic Pump Power System. Wherever temperatures typically rise to 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 will be more rugged compared to they appear at first glance.
Fluid type-Most hydraulics use a form 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 take care of synthetic fluid hydraulics. Polyurethane can also be incompatible with high water-based fluids such as water glycol.
Seals -This is among the most vulnerable aspect of Electro Hydraulic Linear Actuator. Proper seals is effective in reducing 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 used 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, which is adequate for most applications. But stronger materials, such as 65-45-12 ductile iron for rod bearings, can offer a considerable performance rldvub for tough industrial tasks. The sort of piston rod material may be crucial in wet or high-humidity environments (e.g., marine hydraulics) where17-4PH stainless-steel could be stronger 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]