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Shenzhen Dallast Technology Co., Ltd. : Your Trustworthy Telescopic Cylinder Manufacturer！
 

Shenzhen Dallast Technology Co ., Ltd. is a hydraulic cylinder manufacturing enterprise integrated with professional designing, production, and sales. The company after decades of precipitation process, has a mature R&D to production process, technology research, and development capabilities to lead the company's business development capabilities.

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Rich Product Variety

The company focuses on and specializes in the production of various types of hydraulic cylinders, including dump truck hydraulic cylinders; engineering cylinders; agricultural cylinders; telescopic cylinders; small hydraulic cylinders, welding cylinders and hydraulic lifting cylinders, etc.

02

Wide Range of Product Uses

Our products can be widely used in many fields such as dump trucks, dump trailers, garbage trucks, excavators, loaders, forklifts, cranes, ships, mining machinery and fire trucks.

03

Quality Assurance

Our products will undergo many tests such as trial run test, start-up pressure test, pressure resistance test, leakage test, full stroke test, etc. before delivery; each hydraulic cylinder will be tested and will not be shipped until it passes various tests.

04

Leading Service

We have many years of industry experience and a complete production management, quality supervision, sales service operation system. Whether you want to buy a dump truck hydraulic cylinder or an engineering cylinder, just send your requirements by email and we can customize the product for you.

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What is Telescopic Cylinder

 

 

A telescopic cylinder is a specialized hydraulic or pneumatic actuator designed with a series of nested tubes or stages that extend sequentially to provide a longer stroke than would be possible with a single-stage cylinder within the same overall length. The name "telescopic" derives from its resemblance to a telescope, with each stage sliding inside the next like sections of a collapsible tube.

 

Features of Telescopic Cylinder
 

Telescopic Cylinder Take Less Space
One of the main benefits is the fact that these cylinders can be used effectively in small, compact spaces. If your operations are confined and require compact equipment, consider a telescopic hydraulic cylinder that can extend significantly longer than the collapsed length. This is the most logical option if you have limited mounting space and require a long stroke.

 

Telescopic Cylinders Can Meet Specific Angle Requirements
Using this cylinder variety is the most practical in vehicles that feature a hydraulic-powered bed such as a dump truck. There are specific angles that are required to gradually release the materials at the required range, requiring a 60-degree angle to empty the contents of the bed. As well as raising the bed, telescoping cylinders are beneficial in collapsing and returning the bed to a horizontal position.

 

Can Be Made as a Constant Thrust
Special telescopic cylinders are known as constant-thrust/constant-speed cylinders. They are configured so that all moving stages extend simultaneously to provide a constant speed and force while it is extending or retracting. This variety of telescopic hydraulic cylinders is often used to drive drill heads in underground mining where performance parameters are necessary. Due to its more complicated design, this type of hydraulic cylinder accomplished the necessary action by internally trapping oil, limiting the number of moving stages, and matching retract and extend areas.

 

Can Be Made as a Double or Single Acting
Another noteworthy advantage is that telescopic hydraulic cylinders can be made as single-acting, double acting, or a combination of the two. If you opt for the combination of single-acting and double-acting telescopic cylinders, you’ll also receive the benefits of a double-acting cylinder combined with the ease of operation and cost-effectiveness of a single-acting hydraulic cylinder.

 

Telescopic Cylinders Have a Longer Stroke
The stroke length of this cylinder variety is longer than others. The typical collapsed length of a telescopic hydraulic cylinder is roughly 20-40 percent of its fully extended length. This is considered an extra-long stroke that cannot be achieved with other types of cylinder types, making it one of the biggest unique selling points of this variety.

 

Parts of Telescopic Cylinder
Multi Stage Telescopic Hydraulic Cylinder
Multi Stage Telescoping Hydraulic Cylinder
Three Stage Hydraulic Ram
3 Stage Hydraulic Cylinder

Cylinder Barrel
The cylinder barrel is the main body of the cylinder, which houses the pistons and provides the structural support for the telescoping action. It is usually made from high-strength steel to withstand the pressures exerted during operation.

 

Pistons
There are multiple pistons in a telescopic cylinder, each corresponding to a different stage or section. These pistons divide the cylinder into separate chambers. As the cylinder extends, each piston moves in succession, pushing the next stage outward.

 

Piston Rods
Attached to the pistons, piston rods extend from the cylinder barrel and transmit the force generated by the pistons to the load or mechanism connected to the cylinder. Piston rods are typically made from hardened steel to resist bending and wear.

 

Seals
Seals are crucial components that prevent the hydraulic or pneumatic fluid from leaking out of the cylinder. There are various types of seals used in different parts of the cylinder, including piston seals, rod seals, and wiper seals, each designed to handle specific conditions.

 

End Caps
End caps are fitted to both ends of the cylinder barrel. They house the bearings that support the piston rods and may also contain ports for the fluid to enter and exit the cylinder.

 

Bearings
Bearings support the piston rod and guide it as it moves in and out of the cylinder. They are typically located in the end caps and may be either plain or roller bearings, depending on the design requirements.

 

Fluid Ports
These are the openings in the end caps or cylinder barrel through which the hydraulic or pneumatic fluid enters and exits the cylinder. The ports are connected to hoses or pipes that link the cylinder to the pump or compressor providing the fluid power.

 

Cushions
Telescopic cylinders are equipped with cushions, typically located at the end of the stroke, to absorb the energy and reduce shock as the pistons come to a stop. This helps to protect the cylinder and extend its service life.

 

Joints and Couplings
Depending on the application, telescopic cylinders may include joints or couplings that allow for flexibility in mounting and connection to other components.

 

Basic Design Types of Telescopic Cylinders
Multi Stage Hydraulic Oil Cylinder
 

Single Acting Telescopic Cylinders

Single acting telescopic cylinders are the simplest and most common design. 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. This external retraction force is usually gravity acting on the weight of the load. This external weight must obviously be sufficient to overcome the friction and mechanical losses within the machine design even after the work portion of the machine cycle has been accomplished. 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.

Two Stage Hydraulic Cylinder
 

Double Acting Cylinder

A double acting cylinder is extended and retracted using hydraulic or pneumatic pressure in both directions. Double acting telescopic cylinders are thus much more complex in design than the single acting type. 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.

Multi Stage Telescopic Hydraulic Cylinder
 

Single- / Double-Acting Combination

In some applications, a single acting telescopic cylinder is adequate to accomplish the work except for one stage that is required to be double acting. An example of this is erecting the mast of a large mobile drilling rig. The mast is erected to the vertical position using a telescopic cylinder. However, to lower the mast, gravity is not available for the initial tilt back from the vertical position. Thus, the plunger stage only of the telescopic actuator is equipped as a double acting cylinder to provide the initial force to pull the mast back from vertical. Once the tilt back has been initiated, then gravity takes over and supplies the force to complete the full cylinder retraction. The remaining stages, therefore, are single acting.

 

How to Choose Telescopic Cylinders
 

Stroke Length
Determine the required stroke length, which is the distance the cylinder must extend and retract. The stroke length dictates the number of stages necessary in the telescopic cylinder.

 

Force Requirements
Calculate the amount of force needed to move the load. This includes not only the weight of the load but also any additional forces due to friction, acceleration, or dynamic loads.

 

Work Environment
Consider the operating environment, including temperature extremes, exposure to corrosive substances, and the presence of contaminants that could affect the cylinder's seals and performance.

 

Cylinder Size and Installation Space
Measure the available space for installing the cylinder. Telescopic cylinders are designed to provide a long stroke in a compact area, but you still need to ensure that the cylinder’s dimensions fit within the confines of the

application.

 

Material and Construction
Select a cylinder with a material and construction suitable for the intended use. For example, stainless steel or hardened steel might be required for corrosive environments or heavy-duty applications.

 

Sealing Systems
Evaluate the sealing systems available for the cylinder to ensure they can handle the pressure and environmental conditions without leaking.

 

Mounting Options
Look at the available mounting options to ensure they match the installation points on your machine or structure. Cylinders can be mounted in various ways, such as flanged, threaded, or eye mounts.

 

Cylinder Speed
Determine the desired speed of operation. Telescopic cylinders can be designed to operate quickly or slowly, depending on the needs of the application.

 

Cylinder Bore and Rod Diameter
Verify that the cylinder bore and rod diameter are appropriate for the required force and that the cylinder will not exceed its pressure rating.

 

 
How to Maintain Telescopic Cylinders
 
01/

Regular Inspection
Inspect the cylinder regularly for signs of wear, leaks, or damage. Pay attention to seal wear, rod straightness, and the condition of the rod finish.

02/

Cleanliness
Keep the cylinder clean, free from dirt, grit, and other contaminants that can cause abrasive wear and premature failure of seals and internal components.

03/

Lubrication
Apply lubricant to the rod and exposed surfaces as recommended by the manufacturer. This helps prevent rust and reduces friction, extending the life of the cylinder.

04/

Fluid Checks
Regularly check and maintain the hydraulic or pneumatic fluid levels and quality. Contaminated fluid can lead to premature seal failure and component wear.

05/

Seal Replacement
Inspect the seals regularly and replace them when necessary. Seal kits are often available for telescopic cylinders, allowing for easy replacement.

06/

Pressure Testing
Periodically conduct pressure testing to ensure the integrity of the cylinder. This can help identify leaks or weaknesses before they lead to failure.

07/

Storage
When not in use, store telescopic cylinders in a clean, dry environment to protect them from moisture, corrosion, and contaminants.

08/

Operational Practices
Avoid using the cylinder beyond its rated capacity or in extreme conditions not specified by the manufacturer. Abuse can lead to sudden failure and potential injury.

 

 
Frequently Asked Questions
 

Q: What is a telescopic cylinder?

A: A telescopic cylinder is a type of linear actuator that consists of multiple nested tubes or stages that slide out sequentially, allowing for a longer stroke within a relatively small space. They are commonly used in applications where space is limited but a significant extension is required.

Q: How does a telescopic cylinder work?

A: Telescopic cylinders operate on the principle of pressurized fluid (hydraulic or pneumatic) that is applied to the smallest inner tube, pushing it outward. As each successive tube extends, it pushes the next larger tube out until the entire assembly has reached its full extended position. Retraction occurs when the pressure is released, and springs or gravity pull the tubes back into the housing.

Q: What are the advantages of using a telescopic cylinder?

A: Telescopic cylinders offer several advantages, including a compact design for long strokes, the ability to lift heavy loads with minimal deflection, and versatility in mounting options. They are also relatively maintenance-free compared to other types of actuators, making them ideal for a wide range of industrial and commercial applications.

Q: What materials are telescopic cylinders typically made from?

A: Telescopic cylinders are typically constructed from high-strength steel or aluminum alloys to withstand the forces exerted during operation. The seals and piston materials may vary depending on the application, with options such as nitrile rubber, polyurethane, and PTFE for enhanced durability and resistance to chemicals or heat.

Q: Can telescopic cylinders be customized?

A: Yes, telescopic cylinders can be customized to meet specific application requirements. Manufacturers offer a variety of options, including different stroke lengths, load capacities, mounting configurations, and materials. Customization may also involve integrating special features such as cushions, limit switches, or magnetic sensors for added functionality.

Q: What factors should be considered when selecting a telescopic cylinder?

A: When selecting a telescopic cylinder, several factors must be considered, including the required stroke length, load capacity, working pressure, and environmental conditions. Additionally, the cylinder's mounting options, speed, and any special features required for the application should be taken into account to ensure optimal performance and compatibility.

Q: How do I determine the correct size and type of telescopic cylinder for my application?

A: To determine the correct size and type of telescopic cylinder for your application, consult with a knowledgeable sales engineer or manufacturer's representative. They can help you assess your specific needs and recommend the best cylinder option based on factors such as load requirements, space constraints, and operating environment.

Q: What is the difference between single-acting and double-acting telescopic cylinders?

A: Single-acting telescopic cylinders have one chamber for applying pressure to extend the cylinder and rely on gravity or a spring to retract. Double-acting cylinders, on the other hand, have chambers on both sides of the piston, allowing for controlled extension and retraction. Double-acting cylinders are generally more versatile but also more complex and expensive.

Q: What is the maximum load capacity of a telescopic cylinder?

A: The maximum load capacity of a telescopic cylinder depends on its size, design, and material specifications. Heavy-duty models can support loads of several tons, while smaller units may be limited to lifting lighter weights. It is important to choose a cylinder with a load capacity that meets or exceeds the requirements of your specific application.

Q: How do I install a telescopic cylinder?

A: Installing a telescopic cylinder requires careful planning and preparation. Begin by determining the optimal location for mounting the cylinder, ensuring that it has adequate support and clearance for movement. Next, align the cylinder with the load and connect it securely using the appropriate hardware and fasteners. Finally, bleed any air from the system and test the cylinder to ensure proper operation.

Q: What maintenance is required for telescopic cylinders?

A: Telescopic cylinders require regular maintenance to ensure optimal performance and longevity. This includes inspecting the cylinder for wear and damage, keeping it clean and free of contaminants, lubricating moving parts, and replacing worn seals or other components as needed. Manufacturers may provide specific maintenance recommendations based on the application and operating conditions.

Q: How do I troubleshoot common problems with telescopic cylinders?

A: Common problems with telescopic cylinders include leaks, slow operation, or sticking. To troubleshoot these issues, start by checking for obvious signs of damage or wear. Next, inspect the seals and replace any that are damaged or deteriorated. If the problem persists, check the fluid level and quality in the system and bleed any air trapped inside. If necessary, seek assistance from a qualified technician or the manufacturer.

Q: What are the typical applications for telescopic cylinders?

A: Telescopic cylinders are widely used in various industries and applications, including automotive manufacturing, construction equipment, agricultural machinery, material handling, and automation systems. They are particularly well-suited for tasks that require a long stroke within a limited space, such as dump trucks, excavators, and conveyor systems.

Q: Can telescopic cylinders be used in hazardous environments?

A: Yes, telescopic cylinders can be used in hazardous environments, but special precautions must be taken to ensure safety. This may involve selecting cylinders with flame-resistant materials, integrating explosion-proof components, and following strict maintenance procedures to prevent leaks or other failures that could pose a risk.

Q: What is the expected lifespan of a telescopic cylinder?

A: The expected lifespan of a telescopic cylinder depends on several factors, including its quality, material specifications, operating conditions, and maintenance practices. High-quality cylinders that are properly maintained and operated within their design limits can last for many years, often exceeding 100,000 cycles. However, the actual lifespan may vary depending on the specific application and usage patterns.

Q: Can telescopic cylinders be repaired or reconditioned?

A: Yes, telescopic cylinders can often be repaired or reconditioned if they become worn or damaged. Repair services may include replacing worn seals, straightening bent rods, re-chroming barrels, and reassembling the cylinder with new components. However, the feasibility and cost-effectiveness of repair will depend on the extent of the damage and the availability of replacement parts.

Q: Are there any safety considerations when using telescopic cylinders?

A: Yes, there are several safety considerations when using telescopic cylinders. Always follow the manufacturer's safety guidelines and use the cylinder within its design limits. Ensure that the cylinder is properly supported and secured to prevent tipping or buckling. Use protective covers or guards to protect operators from moving parts and flying debris. Finally, always disconnect power and relieve system pressure before performing maintenance or repairs.

Q: How do I choose the right seals for my telescopic cylinder?

A: Choosing the right seals for your telescopic cylinder depends on the application's specific requirements, including the operating environment, working pressure, and temperature range. Consult with a knowledgeable sales engineer or manufacturer's representative to select seals that offer the best combination of durability, flexibility, and resistance to chemicals or other contaminants.

Q: What is the difference between rod-end and cap-end cylinders?

A: Rod-end and cap-end cylinders differ in the way they are mounted and the direction in which they apply force. Rod-end cylinders have a piston rod extending from one end, allowing for force to be applied in one direction only. Cap-end cylinders, on the other hand, have a solid cap on one end and a piston rod on the other, allowing for force to be applied in both directions. The choice between rod-end and cap-end cylinders depends on the specific application requirements and mounting considerations.

Q: Can telescopic cylinders be integrated with other automation components?

A: Yes, telescopic cylinders can be integrated with other automation components to create more complex and sophisticated systems. They can be connected to valves, sensors, controllers, and other actuators to achieve precise control over the movement and position of the load. Integration with automation components can improve efficiency, reduce manual labor, and enhance the overall capabilities of the system.

Shenzhen Dallast Technology Co., Ltd. is one of the most professional telescopic cylinder manufacturers and suppliers in China, specialized in providing high quality customized products with competitive price. We warmly welcome you to buy cheap telescopic cylinder for sale here from our factory. Also, discount information is available.

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