Built-in guide rod type multi-stage plunger hydraulic cylinder

By incorporating a combination of guide plates and guide rods into the multi-stage piston hydraulic cylinder, the problem of relative rotation during the lifting process of the multi-stage piston hydraulic cylinder is solved, achieving stable positioning of equipment or display boards under wind load conditions and meeting outdoor work requirements.

CN224396828UActive Publication Date: 2026-06-23SHANGHAI TONGLI CONSTR ROBOT CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHANGHAI TONGLI CONSTR ROBOT CO LTD
Filing Date
2025-08-26
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing multi-stage plunger hydraulic cylinders are prone to relative rotation during the lifting process due to the helical lines machined on the outer surface of the plunger or the influence of horizontal wind loads, which can cause the detection equipment or display board to deflect and affect normal operation.

Method used

Design a multi-stage piston hydraulic cylinder with built-in guide rod. By setting a guide plate at the bottom of each stage piston and fixing a guide rod thereon, the guide rod is connected to the lower guide plate or the lower cylinder head. The axis is set at intervals to limit the position of adjacent pistons and prevent relative rotation.

Benefits of technology

It effectively prevents the multi-stage plunger hydraulic cylinder from rotating due to horizontal loads such as wind loads during the lifting and lowering process and when it stops in the jacking position, ensuring that the equipment or display board does not rotate during long periods of time and meeting the requirements for outdoor wind-resistant work.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a kind of built-in guide rod type multistage plunger hydraulic cylinder, including outer cylinder barrel assembly, multistage plunger assembly and anti-rotation device. Outer cylinder barrel assembly includes upper cylinder cover, outer cylinder barrel and lower cylinder cover. Multistage plunger assembly includes the multistage plunger that is nested in order from outside to inside, the outermost first plunger can be extended and contracted relative to outer cylinder barrel, and the rest of each plunger can be extended and contracted relative to the first plunger outside;Anti-rotation device includes multistage dredging plate and multiple guide rods, and each level of dredging plate is fixed at the bottom of corresponding first plunger;Each guide rod is used to pass through corresponding first dredging plate, and is connected with lower first dredging plate or lower cylinder cover;The axis of all guide rods is spaced apart from the axis of outer cylinder barrel. The multistage plunger hydraulic cylinder solves the problem that the existing technology is difficult to ensure that the fixed position of detection equipment or display card is unchanged, fills the gap of domestic built-in guide rod type multistage plunger cylinder anti-rotation technology.
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