Internal feedback digital servo hydraulic cylinder

Abstract

The invention relates to an internal feedback digital servo hydraulic cylinder, which belongs to the field of digital hydraulic technology and aims to solve the problems of inaccurate control and difficulty in gain adjustment of an electrohydraulic servo system. The internal feedback digital servo hydraulic cylinder comprises motors, a slide valve, a hydraulic cylinder, a magnetostrictive displacement sensor, an oil path integrated block, a supporting plate and the like. A valve core of the slide valve is driven and controlled by a first motor; a feedback turnbuckle of the slide valve is driven and controlled by a second motor; a hydraulic cylinder displacement signal is fed back to a driver corresponding to the second motor by the magnetostrictive displacement sensor; the second motor is controlled to operate by the driver; and closed-loop digital control over the hydraulic cylinder displacement is realized by controlling relative motion of the feedback turnbuckle and the valve core. The internal feedback digital servo hydraulic cylinder has the advantages of simple structure, high control accuracy, small vibration and high stability, and is suitable for working places with long-stroke and large-thrust hydraulic cylinder.

Description

technical field [0001] The invention relates to an internal feedback digital servo hydraulic cylinder, which belongs to the technical field of digital hydraulics. Background technique [0002] The traditional electro-hydraulic servo control system and electro-hydraulic proportional control system are used to precisely control the displacement, speed, force and other physical quantities of the hydraulic system, but they cannot realize direct digital control, and need to use a digital / analog-analog / digital conversion device. Moreover, the electro-hydraulic servo system has high requirements on the cleanliness of the hydraulic oil, which limits its application range to a certain extent. Pulse hydraulic cylinders, digital cylinders, etc. are directly driven and controlled hydraulic valves by stepping motors or servo motors, and are equipped with hydraulic cylinders with mechanical feedback composed of internal ball screw structures, which can realize direct digital signal (pulse...

AI Technical Summary

Problems solved by technology

However, due to the difficulties in processing and manufacturing of the internal mechanical feedback mechanism, high installation accuracy requirements, prone to failure and troublesome maintenance, etc., especially after the stroke of the oil cylinder increases, the above problems are more obvious, which limits this type of hydraulic cylinder to a certain extent. itinerary

Moreover, in practical applications, there are still problems such as commutation vibration, low-speed crawling, and difficult adjustment of the gain of the control loop.

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