Main categories and characteristics of multi-stage telescopic oil cylinders

 

Multi stage telescopic oil cylinder is a special Hydraulic Cylinder composed of multiple nested pistons or sleeves, which has the characteristics of long stroke and compact structure when retracted. Its classification can be based on dimensions such as motion mode, action form, structural design, and application scenarios.

 

Linear reciprocating multi-stage telescopic oil cylinder: It achieves linear motion by sequentially extending multi-stage pistons, and when retracted, it resets in the order of "from small to large". It is the most common type and widely used in construction machinery, lifting platforms and other equipment, such as the lifting mechanism of garbage trucks and the telescopic arm drive of cranes.

 

Rotary swing multi-stage telescopic oil cylinder: Combining telescopic and rotary functions, it converts linear motion into a certain angle of swing through internal gears or spiral structures, suitable for scenarios that require composite actions, such as ship servos and large machinery rotating platform drives.

 

 

Single acting multi-stage telescopic oil cylinder: The pressure oil only drives the piston to extend in one direction, and the return requires external force (such as the weight of the load, spring force, or external mechanical force). The structure is simple and the cost is low. It is commonly used in one-way load scenarios, such as the lifting oil cylinder of dump trucks and the tipping mechanism of agricultural machinery.

 

Double acting multi-stage telescopic oil cylinder: The piston moves in both directions by alternately injecting oil into two chambers. Both extension and retraction are driven by hydraulic pressure, with high control accuracy and fast response speed. It is suitable for equipment that requires bidirectional load and precise control, such as large hydraulic lifting platforms and telescopic support legs for special vehicles.

 

 

Sleeve type multi-stage telescopic oil cylinder: composed of nested multi-stage sleeves (pistons) with decreasing diameters, it moves in sequence from large to small when extended, and resets from small to large when unloaded and retracted. It has the advantages of large stroke and short retraction length, and is the mainstream type of construction machinery, such as crane telescopic arm oil cylinder and high-altitude work platform lifting oil cylinder.

 

Piston type multi-stage telescopic oil cylinder: The plunger is the main moving component, and there is no contact between the plunger and the cylinder liner. The cylinder liner has low processing difficulty and is suitable for long stroke scenarios. However, it can only move in one direction (requiring external force return) and is commonly used for opening and closing large hydraulic gates and long-distance material conveying equipment.

 

 

Multi stage hydraulic cylinders for construction machinery: designed for excavator construction machinery and loader construction machinery, they have high strength and impact resistance characteristics, such as multi-stage hydraulic cylinders for boom cylinders and multi-stage hydraulic cylinders for boom cylinders. They often adopt a double acting sleeve structure to adapt to harsh working conditions.

 

Customized multi-stage oil cylinders for special equipment: Designed according to specific needs, such as customized multi-stage oil cylinders for special equipment with a long stroke of over 10M (greater than 10 meters), customized multi-stage oil cylinders for special equipment with a super large load of 10000 tons (thrust of 10000 tons) or corrosion-resistant models, applied in fields such as marine engineering and metallurgical equipment, requiring special materials (such as high-strength alloy cylinder barrels for special equipment customized multi-stage oil cylinders) and sealing technology.

 

 

16MPa medium and low pressure multi-stage telescopic oil cylinder: working pressure ≤ 16MPa, suitable for light load scenarios, such as small lifting platforms and agricultural machinery.

 

25MPa high-pressure multi-stage telescopic oil cylinder: working pressure of 25-31.5MPa, used for medium and heavy-duty equipment, such as high-pressure multi-stage telescopic oil cylinders for medium-sized construction machinery and mining machinery.

 

31.5MPa ultra-high pressure multi-stage telescopic oil cylinder: designed for extreme loads with a working pressure greater than 31.5MPa, such as ultra-high pressure multi-stage telescopic oil cylinders for large forging equipment and hydraulic engineering opening and closing systems.

 

From the above classification, it can be seen that the classification of multi-stage telescopic oil cylinders needs to be based on structural characteristics, power modes, and application requirements. Different categories of products have significant differences in stroke, load capacity, and control accuracy, which can meet diverse needs from ordinary machinery to special engineering.