Cylinders allow hydraulic systems to apply linear motion and force without mechanical gears or levers by shifting 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, when compared with pneumatic, mechanical or electric systems, hydraulics could be simpler, stronger, and provides greater power. As an example, Surplus Hydraulic Cylinders has about ten times the power density of an motor unit of similar size. Hydraulic cylinders can be found in a remarkable array of scales to meet a wide range of application requirements.
Selecting the right cylinder to have an application is essential to attaining maximum performance and reliability. Which means considering several parameters. Fortunately, a variety of cylinder types, mounting techniques and “rules of thumb” are for sale to help.
Three of the 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 of the cylinder housing, to supply additional stability. Welded cylinders feature a heavy-duty welded cylinder housing with a barrel welded directly to the end caps, and require no tie rods. Ram cylinders are just what they sound like-the cylinder pushes straight ahead using extremely high pressure. Ram cylinders are utilized in heavy-duty applications and typically push loads rather than pull.
For all types of cylinders, the crucial measurements include stroke, bore diameter and rod diameter. Stroke lengths vary from less than an inch to a few feet or more. Bore diameters may range from an inch approximately more than 24 in., and piston rod diameters vary from .5 in. to more than 20 in. In reality, however, the option 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 how big the bore means increasing the quantity of tie rods necessary to retain stability. Improving the diameter of the bore or piston rod is a perfect approach to make up 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 in the cylinder are best 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 repair, but the mounts produce a turning moment because the cylinder applies force to a load, increasing deterioration. To prevent this, specify a stroke at least provided that the bore size for side mount cylinders (heavy loading has a tendency to make short stroke, large bore cylinders unstable). Side mounts need to 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 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 that also pivot. Clevis mounts can be utilized in almost any orientation and are generally suitable for short strokes and small- to medium-bore cylinders.
Operating conditions-Cylinders must match a particular 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 also must withstand high temperatures, humidity as well as salt water for Excavator Hydraulic Pump. 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 what they appear at first.
Fluid type-Most hydraulics use a type of mineral oil, but applications involving synthetic fluids, like phosphate esters, require Viton seals. Once again, Buna-N seals might not be adequate to take care of synthetic fluid hydraulics. Polyurethane is also incompatible with higher water-based fluids such as water glycol.
Seals -This is probably the most vulnerable part of Stone Hydraulic Power Units. Proper seals can reduce friction and wear, lengthening service life, while the wrong kind of seal can cause downtime and maintenance headaches.
Cylinder materials -The sort 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 is adequate for most applications. But stronger materials, including 65-45-12 ductile iron for rod bearings, can provide a considerable performance rldvub for tough industrial tasks. The kind of piston rod material could be essential 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 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]