Combined gap type multi-stage dump truck hydraulic cylinder

Abstract

The invention discloses a combined gap type multi-stage dumper hydraulic cylinder, and belongs to the technical field of hydraulic cylinders. The combined gap type multi-stage dumper hydraulic cylinder comprises a piston rod, a multistage sleeve and a cylinder barrel, wherein sealing devices are arranged between the piston rod and the sleeve at the next stage or between adjacent sleeves or betweenthe sleeve at the last stage and the cylinder barrel; a matching gap between the sealing device at the last stage and the sleeve or the cylinder barrel is taken as a last-stage matching gap; a matching gap between the sealing device at the next stage and the sleeve or the piston rod is taken as a next-stage matching gap; and a numerical value of the last-stage matching gap is greater than that ofthe next-stage matching gap. The combined gap type multi-stage dumper hydraulic cylinder is simple and compact in structure, is low in cost, and is reasonable in combining and configuration; the numerical value of the last-stage matching gap is greater than that of the next-stage matching gap, so that the defect that friction between stages is too great as a result of not high processing precision and even host machine harm caused by disorderly stretching-out and drawing-back of the multi-stage hydraulic cylinder is effectively reduced; and the combined gap type multi-stage dumper hydraulic cylinder can be widely applied to various multi-stage hydraulic cylinder occasions, and is strong in universality.

Description

technical field [0001] The invention relates to the technical field of hydraulic cylinders, in particular to a combined gap type multi-stage dump truck hydraulic cylinder capable of improving the expansion and contraction sequence of oil cylinders. Background technique [0002] At present, most of the domestic multi-stage dump truck hydraulic cylinder structures and sealing systems for dump trucks are basically similar. Its main features are: 1. The matching gap between the inner hole of each cylinder or upper sleeve and the sealing system installed at this part; 2. The sealing system of each cylinder or upper sleeve inner hole and the lower piston rod The fit clearance of the outer surface remains basically the same. For example, "a dump truck hydraulic cylinder" applied by Shandong Longyuan Hydraulic Technology Co., Ltd.; it includes a sheath, a jacket seal ring, and a dustproof ring. , the inner sleeve I, inner sleeve II, and inner sleeve III are sequentially arranged i...

AI Technical Summary

Problems solved by technology

[0004] However, due to factors such as machine tool accuracy, fixture error, and tool vibration, it is difficult to ensure the design accuracy of the coaxiality and straightness accuracy of the inner hole and outer circle of the sleeve after machining, resulting in the sealing system of the upper cylinder barrel being different from the lower cylinder when the hydraulic cylinder expands and contracts. The friction force on the outer surface of the piston rod is too large, which causes the hydraulic cylinder to expand and contract out of order

When the hydraulic cylinder expands and contracts out of order, it will cause the dump truck compartment to slide down at an instantaneous speed, resulting in strong impact pressure and causing serious accidents

In view of the above-mentioned interference factors on product quality stability in actual production and manufacturing, there is no corresponding preventive design and technical considerations in the design level of existing products

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