Design method of a hydraulic cylinder and hydraulic cylinder

Abstract

The invention discloses a design method of a hydraulic oil cylinder and the hydraulic oil cylinder, comprising: determining the overall reliability R of the hydraulic oil cylinder; determining the allowable reliability Rn, the strength reserve coefficient n and the reliability index [z] of each part of the hydraulic oil cylinder ; Calculate the stress distribution parameters μr, σr or the intensity distribution parameters μS, σS; based on the reliability index [z] and the strength reserve coefficient n, and calculate the stress mean value μS or μr according to the strength-stress interference model; based on the mean value μS or μr and according to The relationship between the mean value μS or μr and the size of the hydraulic cylinder parts determines the corresponding structural size of the hydraulic cylinder parts. The design method and the hydraulic cylinder of the present invention do not consider the selection of the safety factor, but consider the randomness of the strength and stress, and use the strength-stress interference model to determine the structural size of the hydraulic cylinder and calculate the reliability of the hydraulic cylinder, which is reliable. It has the characteristics of high degree of safety and high degree of safety, and can save costs and improve product quality, so that the hydraulic cylinder has a safety effect that meets the requirements of use.

Description

technical field [0001] The invention relates to the technical field of construction machinery, in particular to a design method of a hydraulic oil cylinder and the hydraulic oil cylinder. Background technique [0002] At present, the conventional design of hydraulic cylinders is generally based on the design method of the worst condition analysis. Assuming that the minimum strength and maximum load occur at the same time, the ratio between the two is the safety factor. The selection of the safety factor is generally based on long-term practical experience. [0003] (1) Solve the cylinder wall thickness δ by the following cylinder strength calculation formula: [0004] [0005] [0006] [0007] The parameters in the above formula are: F max : maximum thrust of hydraulic cylinder; D: inner diameter of hydraulic cylinder; P t : Maximum working pressure of hydraulic cylinder; δ: Wall thickness of hydraulic cylinder; σ s : Yield stress of hydraulic cylinder barrel ...

AI Technical Summary

Problems solved by technology

[0031] (1) The safety factor is determined based on long-term practical experience, which is generally conservative and likely to cause waste of materials;

[0032] (2) The error caused by the uncertainty of various parameters such as the strength, pressure, and dimensional stability of the hydraulic cylinder is not considered;

[0033] (3) The calculated safety factor does not reflect the reliability of the hydraulic cylinder

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