A digital electro-hydraulic loading device and loading method suitable for large load intervals

Abstract

The invention discloses a digital electro-hydraulic loading device suitable for a large load interval. The digital electro-hydraulic loading device suitable for the large load interval comprises a hydraulic cylinder group, a guide mechanism, a loading mechanism and a loading control loop, wherein the acting areas of the hydraulic cylinder group, the guide mechanism, the loading mechanism and the loading control loop increase progressively according to the geometric progression; the hydraulic cylinder group is connected with the loading mechanism through the guide mechanism to transmit loadingforce to the loading mechanism. The hydraulic cylinder group comprises a hydraulic cylinder controlled by an electro-hydraulic proportional valve or an electro-hydraulic servo valve and (N-1) hydraulic cylinders controlled by a common on-off valve, wherein N is a positive integer greater than 1, and by controlling the pressure of the electro-hydraulic proportional valve or the hydraulic cylinder controlled by the electro-hydraulic servo valve under different load values and the opening or closing state of the hydraulic cylinders controlled by the common on-off valve, the continuous change of the total output loading force in a certain full range is achieved. The digital electro-hydraulic loading device suitable for the large load interval does not need to adopt the large hydraulic cylinderand a hydraulic system matched with the large hydraulic cylinder, so that the problems of increased manufacturing cost, slow response of the system and poor dynamic performance of the system are solved.

Description

technical field [0001] The invention relates to the technical field of hydraulic loading control, in particular to a digital electro-hydraulic loading device suitable for a large load interval and a loading method thereof. Background technique [0002] Hydraulic transmission is currently a very widely used power transmission method in the industrial field, such as cranes, press machinery, machine tools and so on. Compared with mechanical transmission, the components in hydraulic transmission system are relatively independent and can be flexibly arranged according to needs; and the system has high rigidity, high precision and fast response speed; it has the characteristics of self-lubricating, self-cooling and long service life. Easy to implement security protection. [0003] The power output form of the hydraulic system is mainly divided into rotary motion (the actuator is a hydraulic motor) and linear motion (the actuator is a hydraulic cylinder). The latter is often used ...

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Problems solved by technology

[0004] In order to overcome the deficiencies of the above technologies, the present invention provides a digital electro-hydraulic loading device suitable for a large load range, without using a large hydraulic cylinder and a hydraulic system that cooperates with the large hydraulic cylinder, avoiding the increase in manufacturing costs and changing the system response. Slow and deteriorating system dynamic performance

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