1. High-Quality Raw Materials Our raw materials are primarily sourced from renowned steel mills such as Jiangsu BOS Hydraulic Technology Co., Ltd., Baosteel, Ansteel, and Changjiang Steel Pipe.
2. Advanced Production Equipment Our manufacturing facilities include cold drawing machines, honing machines, skiving and roller burnishing machines, straightening equipment,polishing machines, heat treatment furnaces, grinding machines, and more.
3. Rich production experience, strict quality control We implement a professional internal quality control system to conduct comprehensive inspections on all products.
The single acting telescopic hydraulic cylinder is an engineering masterpiece that cleverly utilizes simple principles to solve complex space and stroke problems. It continues to play an irreplaceable role in specific application fields with its compact structure, considerable thrust, and economic cost.
Extremely compact structure: In a fully retracted state, it has the smallest installation length among all hydraulic cylinders. The design of the multi-stage sleeve enables it to achieve a long stroke with a very short initial length, which is a decisive advantage in situations where installation space is limited.
Powerful multi-stage thrust: Although the thrust decreases as each stage of the cylinder extends, in the initial stage, the largest first stage cylinder can provide the maximum thrust, which is very suitable for working conditions that require “powerful miracles”.
Self weight retraction: This is the core of “single action”. It relies on external loads (such as the weight of the carriage) or internal springs to retract the cylinder, eliminating the need for complex return oil and oil pipelines and simplifying the system.
High cost-effectiveness: With only one oil port and one oil pipe, hydraulic systems such as pumps, valves, and pipelines are simplified, reducing manufacturing costs and maintenance complexity.
Single acting telescopic hydraulic cylinder, commonly known as “multi-stage cylinder” or “tower cylinder”, is a special type of hydraulic cylinder. It is composed of multiple cylinder barrels (or “sleeves”) in a set form
The design of the single acting telescopic hydraulic cylinder enables it to flexibly adapt to various complex and harsh working conditions:
Space adaptability: Its compact closure length solves the fundamental contradiction between long travel and short installation space, and is widely used in mobile devices such as trucks and agricultural machinery.
Flexible installation posture: The most common installation method is to push vertically upwards (such as a dump truck) and use the weight of the lifted object to achieve retraction. But it can also be installed horizontally or at an angle, simply by using additional retraction mechanisms (such as springs) or leveraging the gravity of the lever mechanism.
Environmental tolerance: Special sealing and surface treatment can be designed to adapt to harsh industrial environments such as dust, humidity, high and low temperatures. For example, chrome plated cylinder surfaces can provide excellent wear and corrosion resistance.
Extension process (hydraulic drive):
Pressure oil enters the bottom of the cylinder block through the only oil port.
The oil pressure first pushes the first stage cylinder with the largest diameter to extend.
When the first stage cylinder reaches the end of its stroke, the oil pressure begins to push the second stage cylinder out, repeating this process until the smallest first stage cylinder is fully extended.
During this process, the thrust gradually decreases because the effective working area (related to the cylinder diameter) gradually decreases (F=P × A).
Retraction process (driven by external force):
The hydraulic system is depressurized, and the pressure at the oil port is released.
At this point, external forces (such as the weight of the lifted cargo compartment) are applied to the end of the cylinder.
This external force forces the cylinder tubes at all levels to retract section by section starting from the outermost stage.
During the retraction process, the hydraulic oil inside the cylinder is discharged and flows back to the oil tank.
Dump truck/dump truck: This is the most classic application used to lift carriages and dump goods.
Garbage truck: used for compressing and lifting garbage bins.
Agricultural machinery: lifting mechanisms such as tractor trailers, straw balers, and fertilizing machines.
Engineering machinery equipment: used as support or lifting legs on certain high-altitude work platforms and sanitation vehicles.
Material handling equipment: used in warehouses and factories to lift platforms or tilt devices.
When space is the primary constraint: when you need a long journey but the installation space is very limited, this is the most crucial decision point.
When the system requires simplicity and cost sensitivity, saving half of the oil circuit and control system can significantly reduce equipment and maintenance costs.
When there is a reliable external retraction force: if the application scenario itself can provide stable and reliable gravity or mechanical force to return the mechanism, then using complex double acting cylinders is a waste.
When the main task is one-way recommendation: if the work cycle is mainly “lift hold fall” and there is no precise control requirement for the speed and force of the return journey.
With the advancement of industrial technology, single acting telescopic hydraulic cylinders are also constantly evolving, and future trends are mainly reflected in:
Lightweight and High Strength: Using high-strength steel, aluminum alloy, and even composite materials to reduce self weight while ensuring thrust and durability, helps improve the energy efficiency and load-bearing capacity of mobile devices.
Intelligence and state monitoring: Integrated sensors (such as displacement sensors, pressure sensors) are used to monitor the cylinder position, load status, and sealing health in real time, achieving predictive maintenance and preventing unexpected shutdowns.
Higher sealing technology and reliability: Develop more wear-resistant, low friction, and long-life sealing materials and structures to reduce internal leakage and improve working life and reliability in harsh environments.
Integration and competition with electric cylinders: In some situations where high cleanliness and control accuracy are required, electric telescopic push rods will compete. In the future, a hybrid solution of hydraulic and electric drive may emerge to balance the advantages of power, stroke, and control.
Environmental friendliness: better adaptation to biodegradable hydraulic oil, and emphasis on oil sealing and leak prevention in design to reduce environmental impact.
