telescopic cylinder types

2022.07.31
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telescopic cylinder types

This process is automatic. Phelps packing is compatible with standard hydraulic oils. A telescopic hydraulic cylinder can be used in several types of applications that require a linear force to be applied over a long distance. Alternative rod materials available including carbon steel, precision honed, hard chrome plated stages. Telescopic multi-stage cylinders and large single ram type cylinders are the majority of our competitive edge. In the case of a dump truck/trailer the distance between where the cylinder is mounted and where the dump hinge is located can affect performance. Choosing the right telescopic cylinder design also requires knowledge of the number of stages, stroke length, and largest OD stage (outside diameter). This retract side of the cylinder is normally significantly smaller than the extend side so during extension there is generally no issue; however, during retract the flow of oil to the retract side of the cylinder can be equal to the flow that had been used to originally extend the cylinder. During typical operation of a dump truck the initial pressure to start raising the truck body or trailer should never exceed 600800 PSI.

A cylinder with a 7:1 ratiowhere the extend side is 7 times larger than its retract sidecan have a pressure intensification issue. St-Jacques, Quebec It offers the capabilities of performing its tasks optimally while being both durable and capable of customization to suit a specific purpose. Phelps Telescopic Hydraulic Cylinders are engineered to achieve truer and smoother operation in heavy duty applications. Additionally, if material does become stuck in the dump body/trailer system pressure will continue to increase throughout the entire stroke (See the red line in Figure 1). Copyright 2019 Phelps Industries, Inc. |. Both single and double acting cylinders will require some level of pressure to build in order to generate enough force to overcome the load that is opposing them. Less dead lengths per stage than a conventional double acting telescopic. Hydraulic power units , with certain design criteria and circuitry, can be supplied complete. Replacement telescopic hydraulic cylinders are a great way to keep your industrial heavy machinery up and running. In such a circumstance, both ports can be located in the barrel.

In this case, the stages are decreasing and the load is decreasing throughout the stroke of the cylinder (See the blue line in Figure 1 as an example). The pressures will be significantly different using a different cylinder. The remaining stages, therefore, are single acting. Extra wide bronze bearing rings, top and bottom. You will be redirected once the validation is complete. Packing is accessible under external gland nuts, removable with supplied spanner wrench, allowing ease of packing adjustment or replacement. Electro-Pneumatic Regulator & Flow Controller Design. To accomplish this long travel with a conventional hydraulic cylinder is very difficult considering that the collapsed length of a single stage rod cylinder is approximately 110% of its output stroke. For example, if the system pressure is limited to 2000 PSI and the largest diameter available in the telescopic cylinder is 7", the cylinder will only be able to produce a maximum force of 38.5 tons. At the most simplified level, all cylinders generate force and motion in the same way.

Thus if the hydraulic fluid return line is blocked during extension a Each design offers specific advantages; both types are suitable for fitting into tight spaces. Pressure intensification and back pressure are other factors that should be considered when using a cylinder. Phelps Industries started designing and manufacturing cylinders in 1980. This can also be accomplished in a double acting design by matching the extension and retraction areas of the pistons on all the stages. 6 stages are commonly thought to be the practical design limit as stability problems become more difficult with larger numbers of stages. The service requires full cookie support in order to view this website. [6], A double acting cylinder is extended and retracted using hydraulic or pneumatic pressure in both directions. Double-Acting Welded Rod Hydraulic Cylinders, Hydraulic Cylinder Seal Kits & Component Parts, Haul Truck / Off-Highway Dump Articulated, What to Consider When Choosing a Telescopic Hydraulic Cylinder, How to Prevent Bent Hydraulic Cylinder Rods, Servicing Your Snap Ring Hydraulic Cylinder. If the force is reduced during extension of the cylinder, the pressure will follow closer to the blue line. Typically the collapsed length of a telescopic cylinder is 20 to 40% The collapsed package size plus long stroke capability of a telescopic cylinder is one of the advantages the design offers over a rod cylinder. The largest diameter sleeve is called the main or barrel. Once the tilt back has been initiated, then gravity takes over and supplies the force to complete the full cylinder retraction. This external retraction force is usually gravity acting on the weight of the load. They both feature a telescopic design consisting of several at most six, stages, each fitting compactly into the other. The extension port is mounted at the base of the outer barrel and the retraction port is mounted in the end of the plunger section. This field is for validation purposes and should be left unchanged. While a rod cylinder could potentially perform the job it may be too long when fully collapsed, where as a telescopic cylinder will typically be significantly shorter when in the same position. While all are considered telescopic cylinders, each cylinder type has its own advantages. Several things can limit the force applied by a cylinder. In cases like this it is best to have a high flow dump valve plumbed into the circuit to prevent damage to the cylinder or other system components.

A double acting design is therefore required to both push and pull the telescoping mechanism. This means that the flow rate of oil leaving the cylinder is 140 GPM. [3], Basic design types of telescopic cylinders, Hyco Ultrametal, Telescopic Hydraulic Cylinders, Ergo-Help Pneumatics, EHTC Telescoping Cylinders, "Telescopic Cylinders Go The Extra Distance", Hyco Alabama, Tutorials, Introduction to Telescopic Cylinders, https://en.wikipedia.org/w/index.php?title=Telescopic_cylinder&oldid=1095685460, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 29 June 2022, at 18:58. Contrary to this, if the available surface area is small, a higher pressure will be required to move the load. In order to empty the load of gravel completely, the dump body must be raised to an angle of about 60 degrees. The mast is erected to the vertical position using a telescopic cylinder. This special passageway is in itself a telescopic assembly that extends with the cylinder and is outfitted with seals on the various stages.[3]. Fluid Power World is written by engineers for engineers engaged in designing machines and or equipment in Off-Highway, Oil & Gas, Mining, Packaging, Industrial Applications, Agriculture, Construction, Forestry, Medical and Material Handling. specifications. Because the seals used to accomplish this must pass over these internally machined fluid transfer holes, the seals are usually made from hard materials to resist wear and abrasion. If the available surface area is large, the resulting pressure required to move the load will be low. sales@hydrauliccylindersinc.com. The sealing system used is stacked V-packing rings or single lip U-cups molded specifically for Phelps Telescopic Cylinders. 2022 Aggressive Hydraulics, Inc. All Rights Reserved. Our improvements and facility expansions allowed us to offer a quality cylinder into the market place. Telescopic cylinders are designed with a series of steel or aluminum[2] tubes of progressively smaller diameters nested within each other. This additional complexity is due to the requirement of adding retracting piston faces to all of the cylinder stages and the difficulty in supplying pressurized fluid to the retraction pistons of the intermediate stages. A number of other special designs also exist including a hybrid single/double acting design, and a constant speed, constant thrust design. Fax: 888-693-8681 Top and bottom on pin mount models. The use of extra wide internal bronze bearings means greater low friction surface for our telescopic cylinders to operate.

This wider bearing surface aids in the prevention of side-loading, which ultimately causes scoring within the tube and sends damaging metal particles throughout the hydraulic system. Protect Your Hydraulic Cylinder with Grease, S74DC-74-135 (Commercial / Parker) Replacement SAT Dump Hoist Cylinder, S74DC-74-161 (Commercial / Parker) Ox Bodies MAC Trailer Replacement SAT Dump Hoist Cylinder, S63DC-96-130 (Commercial/Parker) Ox Bodies SAT Dump Hoist Cylinder, S64DB-12-135 (Commercial / Parker) Replacement SAT Dump Hoist Cylinder, S63DC-102-120 (Commercial / Parker) Heil Replacement SAT Dump Hoist Cylinder. In a typical dump application, the truck or trailer body will be lifted into the air by the cylinder and the weight of the body will cause the cylinder to retract. All telescopic cylinders have a comprehensive warranty program. Reliable Engineering for Todays Bulk Handling Industry Permanent or Portable. If the weight or force pushing on the cylinder is large it will cause the cylinder to collapse quickly. Horizontal, or near horizontal applications, do not have gravity available to assist in the retracting of the cylinder. Each one may present unique challenges beyond those that apply to the applications covered; however, the general concept remains the same. We offer a full line of four stage, single acting telescopic cylinders with five standard series of sizes. This relief valve is utilized on the retract side of the cylinder, limiting the force that can be created during retract. [3], Single acting telescopic cylinders are the simplest and most common design. Telescopic cylinders present an additional challenge when considering the force required. A few of the key limiting factors to consider are the size and resulting surface areas available within the cylinder, the materials of the cylinder, the cylinder construction/design and the pressure limitations of the hydraulic system. Interestingly, the pressure is truly the consequence of applying a force. Our engineering team comprised of engineers, technicians and draftsmen are dedicated to developing value added, innovative solutions for our customers. Anexperienced engineering teamhelps you work through design considerations to ensure your cylinder meets your requirements. Engineers in almost all of the worlds industries require hydraulic cylinders capable of providing sufficient force to move huge loads. Telescopic hydraulic cylinders utilize multiple nested stages, achieving a long working stroke in compact/retracted form. Our fully welded type construction, which incorporates a generous lap between stages for more stability and rigidity, allows our cylinders to have a higher stress and side-loading threshold. www.powermotiontech.com is using a security service for protection against online attacks. Thus a double acting telescopic actuator usually retracts starting from the smallest diameter stage to finish with the largest stage retracting lastly. At Mailhot Industries we believe in creating partnerships with our customers to better understand their individual specific needs. By doing so, we are able to target potential or existing problems and then apply an innovative solution that adds value. For this reason, care must be taken to avoid shock pressures in a hydraulic system using telescopic cylinders. In addition, internal air or oil passageways are machined so that as each stage completes retracting, a passage is open to supply the next stage with pressurized fluid to retract. This additional complexity makes double acting telescopic cylinders very expensive. If the system is capable of 2500 PSI, the same 7" diameter stage can now produce 48.1 tons of force.

Plunger rod can be double acting and sleeves single-acting. An example of this is erecting the mast of a large mobile drilling rig. Typical applications for our custom telescopic cylinders include: Valuable resources to help you plan your custom telescopic cylinder design. Telescopic cylinders consist of a single or double-acting cylinder with several piston rods inserted into each other, whereby the hollow rod in each case becomes the body for the next stage. This same principle applies to both single acting and double acting cylinders. The pressure must also build to a high enough level within a double acting cylinder to allow it to retract; however, the pressures required to retract a telescopic cylinder can be much higher than the pressures required to extendthat is if the same forces are required to extend and retract. Phelps Hydraulic Telescopic Cylinders can replace existing telescopic cylinders and retrofit to any existing truck dumper. Applications that are horizontal, or near horizontal, will have pressure signatures similar in nature to those noted in Figure 1. This is because the dump angle is increasing and material is leaving the dump body. Telescopic cylinders provide extended reach, making them perfect for heavy construction machinery, dump trucks, and other industrial mobile vehicles. When deciding which telescopic cylinder is right for you, it is important to think about whether you need a standard telescopic cylinder or custom telescopic cylinder.

An internal passageway must be fitted, however, so that the retracting fluid is supplied to the plunger section at full extension. At this high flow rate, there will be a lot of back pressure that can damage the cylinder or the system. Telescopic cylinders should not be used to stabilize a structural component. At Southern Hydraulic Cylinders, we offer two types of telescopic cylinders. Heavy duty construction with generous lap between stages. There are exceptions however, with one pneumatic cylinder manufacturer successfully incorporating up to 9 stages in their cylinder designs. The plunger rods can be single or double-acting. Telescopic Hydraulic Cylinder Applications and Advantages, Increasing Your Reach With A Custom Telescopic Cylinder, The Importance Of The Design Phase In A Custom Telescopic Cylinder. [3], To accomplish the double acting feature, additional hydraulic seals are added to internally seal off the individual stages. The reason for the different cylinder use per application is due to the ability or restriction on being able to retract the extended cylinder. Choose from the following custom telescopic cylinder design options: Purpose-built designs ensure that you get the best performance from your custom telescopic cylinder. Some factors to consider when choosing a telescopic hydraulic cylinder include: Common industrial mobile equipment that benefits from telescopic cylinders: Whether you need a single-acting or double-acting telescopic hydraulic cylinder, make sure the telescopic cylinder you select can withstand workload demands.

Often such hydraulic systems are equipped with shock suppressing components, such as hydraulic accumulators, to absorb pressure spikes. These cylinders will provideretract forcefor a portion of the stroke, and gravity completes the retract cycle. The cylinders are usually mounted in machinery by pivot mounts welded to the end or outer body of the barrel as well as on the end of the plunger. Content from this site may not be reused without permission. [3], In some special applications, a telescopic cylinder is required to extend with a constant force or constant speed. [1] It would be very challenging for the design engineer to fit the single stage cylinder into the chassis of the dump truck with the dump body in the horizontal rest position. This task is easily accomplished, however, using a telescopic style multi-stage cylinder.[3]. While it may seem simple at first, choosing and buying the right hydraulic cylinder can be a time-consuming and overwhelming. We can handle all of your mounting requirements. We specialize in large multiple stage single acting telescopic hydraulic cylinders. Telescopic cylinders are commonly restricted to a maximum of 6 stages. Telescopic hydraulic cylinders are ideal for applications where force space is limited. T: (306) 786-2677 | Toll Free: (877) 799-1005 | F: (306) 786-2651, Click here to download our RFQ form (PDF), Alternative barrel tube stage coatings available including nitride, chrome over nickel, plasma spray. Rod cylinders will apply the same force throughout their stroke, assuming that system pressure remains constant. A typical dump trailer application will be different because the force needed to move the body will decrease as the cylinder is being extended.

Experience across various markets and hydraulic applications helps us understand your unique challenges and design the best solution for the equipment and operating environment. For instance, if there is a large over-hung load past the dump hinge a lower force is required to extend the cylinder. The weight of the steel bodies and the hydraulic oil contained within the actuator create moment loads on the bearing surfaces between stages. There are numerous applications that use cylinders, and specifically those that require telescopic cylinders. In the example above of the dump truck, the weight of the dump body, now raised at an angle of 60 degrees but empty of the load, must be enough to force the unpressurized hydraulic fluid out of the cylinder and cause it to retract to the fully collapsed position. To help protect the system and cylinder a "down side" relief valve is normally installed. Please enable JavaScript on your browser and try again. In double acting cylinders, both telescopic and rod, pressure intensification can occur. At Southern Hydraulic Cylinder, our engineers and technicians will work with you to ensure you understand your options, including what type of telescopic cylinders will prove to be the most effective and efficient. As with a single acting rod style cylinder, the single acting telescopic cylinder is extended using hydraulic or pneumatic pressure but retracts using external forces when the fluid medium is removed and relieved to the reservoir. pressure intensifying effect can occur causing seal failure or even causing the metal sleeve to balloon outward. More complex than single-acting cylinders, double-acting telescopic cylinders retract and extend via hydraulic pressure. For example, the weight of a dump body plus the material in it creates a load that requires a specific force to be applied in order to move or dump the material. We offer different designs, attachment configurations and application oriented products that outlast the competition. Steel Stop Rings are welded in, eliminating troublesome snaprings. Proper maintenance and Phelps service can also extend the life of your telescopic cylinder. Custom designed telescopic cylinders can be made with load capacities in mind, allowing for enhanced capacity, stroke lengths, and number of stages that standard telescopic cylinders cant match. These range from a smallest (final) moving stage O.D. www.powermotiontech.com is using a security service for protection against online attacks. Fluid Power World covers pneumatics, mobile hydraulics and industrial hydraulics.

Phelps Telescopic Cylinders meet or exceed O.E.M. The smaller inner sleeves are called the stages. Sticking with the 7:1 ratio, a cylinder that takes 35 gallons to extend and five gallons to retract will have a cycle time of 2 minutes1 minute, 45 seconds, for extension and 15 seconds to retract. It performs optimally where a rod-cylinder cannot. When standard options wont do, custom telescopic cylinders can be built to spec. Each potential limitation can be tied to one another. This technique is necessary when very long strokes are required compared to the installation length of the cylinder. Other parts including castings and bearings are machined and then tagged to assure proper specifications. At Mailhot Industries, we distinguish ourselves by constantly finding ways to innovate our manufacturing technologies. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media. As oil is supplied to the cylinder, pressure builds in an attempt to move the stages. Two Types of Telescopic Cylinder: Which do I need? However, to lower the mast, gravity is not available for the initial tilt back from the vertical position.

Note: All examples are calculated with theoretical conditions using a 5 stage cylinder.

Pressure is a result of the force generated/required to perform the job. The danger exists that a permanent deformation of the outer diameter of a sleeve could occur, thus ruining a telescopic actuator. As the dump angle increases during the extension of the cylinder, less weight is applied to the cylinder while more weight shifts to the rear hinge (See the red line in Figure 1 for this situation). Single or double acting telescopic cylinders, Multiple attachment configurations available, Operating pressures up to 2000 psi (138 Bar), NCERA option available to improve corrosion resistance, Meet industry requirements for safety and performance. With the ability to extend further, it is the ideal hydraulic cylinder for such heavy-duty equipment as dump trucks, excavators, and garbage trucks. A fluid is forced into the vessel and it pushes against a movable surface. As the double acting cylinder extends, it forces oil out of the retract port. Blocks foreign contamination from entering the hydraulic system by removing stuck-on contaminants. [6], Care must be taken when controlling most double acting telescopic design cylinders. Special packing materials are available when required by the specification of non-standard hydraulic fluids. Reservoir sizes can range from 60 gallons to 2,000 gallons. In some cases the system pressure limit may be a result of the maximum pressure rating of the cylinder; in other cases, the cylinder maximum rating is greater than the system maximum. An example of this would be an elevator where the force applied to the cylinder is the same during its entire extension, as long as the number of riders remains constant. This can, in some applications, prove to be very difficult to connect with hydraulic hoses due to the distance between these ports at full extension. Material selection and construction or design of the cylinder will only limit the maximum pressure and force that the cylinder can handle. www.powermotiontech.com is using a security service for protection against online attacks. Partially double-acting cylinders are typically used in over-center applications. The available surface area within the cylinder determines the amount of force generated at a given pressure. 2721, 341 North Road The defining factor in the pressure signature is the force that is pushing against the cylinder. Telescopic cylinders are a special design of a hydraulic cylinder or pneumatic cylinder as well as pulley system which provide an exceptionally long output travel from a very compact retracted length. [2], Telescopic cylinders require careful design as they are subjected to large side forces especially at full extension. Knowing the correct measurements needed for your telescopic cylinder can help you choose a cylinder that will meet your requirements and specifications. These are single and double-acting. This special combination is much less complex and much less costly than using an entirely double acting design. [4], Another problem can occur if a double acting telescopic cylinder encounters a load that pulls on the actuator during extension such as when a tilting load goes over center and opens the cylinder beyond the internal volume of the hydraulic oil. Too much pressure will cause the nested sleeves to balloon outward, bind the mechanism and stop moving. This is because the pressure typically increases within the cylinder and hydraulic system as the cylinder extends (See the blue line in Figure 1). The cylinder could thus be rendered unable to retract because of failed seals or jam in position due to binding. While it is possible to design a telescopic cylinder that applies a constant force, the cost is significantly increased. The smallest stage is often called the plunger[3] or piston rod. All of our cylinders are manufactured at our facility using mill purchased 1026 DOM tubing. If it is a constant force, the pressure will steadily increase like the red and green lines. This shaver technology offers unmatched performance in certain applications. Skip-a-sleeve option, which is a sleeve or stage, is skipped during design, increasing the effective area and retract force. If you want a longer reach but also must place it within a confined space, you should consider a telescopic cylinder. Side forces and moment loads must be minimized. Controls can be arranged to extend a single telescopic cylinder or to operate a series of telescopic cylinders. In all of these applications, the cylinder operates near horizontally and thus gravity is not available to retract the actuator. How Do I Know Its Time to Repair My Hydraulic Cylinders? Toll Free: 888-771-1894 You can choose from one of several hydraulic power options however, if you need to apply force in a small space, the most satisfactory type is the telescopic cylinder. Read more >, We offer a shaver that was developed through our R&D department that is a patented metal wiper. 2010-2022 Mailhot | Allrightsreserved, Mailhot | Manufacturer of hydraulic cylinders at the forefront of technology since 1956 |, 2010-2022 Mailhot | Allrightsreserved, Protects cylinder from scratching or other potential surface damage, Variable warranty offered depending on the product and its use, Improved corrosion and wear resistance with NCERA, Operating pressures up to 3000 psi (207 bar). When the piston face catches up again and strikes the oil column a pressure spike occurs which can damage the actuator.[4]. In some cases the body of the truck or trailer may go "over center," meaning that the body of the vehicle is now pulling on the cylinder once fully extended. of the fully extended length depending on the number of stages. Mailhot differentiates their telescopic cylinders from the competition by offering exceptional durability via our patented ARCOR salt bath nitriding process. Typical applications for double acting telescopic cylinders include the packer-ejector cylinders in garbage trucks and transfer trailers, horizontal compactors, telescopic excavator shovels, and roll-on/roll-off trucks. The service requires full JavaScript support in order to view this website. All telescopic cylinders are pressure tested before leaving our plant and designed to operate at a maximum of 2,000 PSI. The effective retraction area is often much less than the extension area. [1] Some pneumatic telescoping units are manufactured with retracted lengths of under 15% of overall extended unit length. Telescopic cylinders are also referred to as telescoping cylinders and multi-stage telescopic cylinders.

They are often iron rings or glass reinforced nylon seals. We offer many types of large diameter cylinders . Optional integrated machined piston design, Steel or ductile internally threaded gland design, Optional end mounts: trunnion, clevis, tang, cross tube, spherical bearing, custom bushing, cross drilled hole, Custom arrangements for port size, type and location, Seal options: Urethane wiper seals, modern urethane lipped shaft seal, modern urethane one piece static seals, glass filled nylon gland bearing rings, glass filled nylon piston bearing rings, cast iron piston rings, interlocking step-cut reinforced heat stabilized thermoplastic zero leak piston rings, and custom sealing arrangements for high or low temperature, high cycle or continuous duty. If the force is to remain constant, the pressure will increase as each smaller stage begins to move (See the green line in Figure 1). Pre-Engineered Cylinder Drawing Application, Single-Acting Telescopic (SAT) Hydraulic Cylinder Calculator, Double-Acting Telescopic (DAT) Hydraulic Cylinder Calculator, Single-acting telescopic hydraulic cylinders, Double-acting telescopic hydraulic cylinders, When to Consider a Telescopic Hydraulic Cylinder, Video: Avoiding Downtime with Purpose Built Cylinders, Combination of single- and double-acting telescopic cylinders, Common hydraulic pressures up to 2,000 psi, special applications optional up to 3,000 psi, Hydraulic flow and pressure extends the cylinder, Gravity or some other external force will retract the cylinder, Hydraulic power retracts cylinder as opposed to gravity/force, Piston seals are typically cast iron rings, Cylinder is not designed to hold load in exact positions (drifting), Minimum flow required to prevent stalling, Both ports on the barrel design avoid moving hoses and wear patterns, Positive piston seals allow the cylinder to hold the load and eliminate the minimum flow requirement, Less dead lengths per stage than a conventional double acting telescopic cylinders.