Universal electro-hydraulic position servo driver

Abstract

The invention relates to a universal electro-hydraulic position servo driver. The existing electro-hydraulic servo system driver mainly adopts a distributed structure. In the universal electro-hydraulic position servo driver, an SSI (Small Scale Integration) conversion module is externally connected with an SSI displacement sensor and is used by the driver for the preprocessing of input signals. An ARM 7 core is the core of the driver. An operating panel is a visual interactive operating interface and mainly consists of a liquid crystal display, a keyboard input and a light-emitting diode (LED) indicator lamp. A serial port level conversion module provides an external control port for the driver and a computer can realize the real-time data communication and the accurate system control of the servo driver through the serial port level conversion module. A digital-to-analog (D / A) conversion and amplification module is an ARM 7 self-contained D / A module and can provides an electric control signal for a servo valve or a proportional valve. A power supply module is used for providing power for all modules of the driver. The universal electro-hydraulic position servo driver has the advantages that the structure is simple, the integration level is higher, the driver is convenient to operate, the cost is lower and the large-scale popularization and application are facilitated.

Description

technical field [0001] The invention relates to an integrated driver applied to an electro-hydraulic position servo system, in particular to a general-purpose electro-hydraulic servo driver with functions of digital display, panel control and external control. Background technique [0002] At the end of the 21st century, the electro-hydraulic servo system developed rapidly and played an increasingly important role in the field of industrial control. The electro-hydraulic servo system is a feedback control system that combines electrical devices and hydraulic actuators. The most common types are electro-hydraulic position servo system, electro-hydraulic speed control system and electro-hydraulic force control system. The electro-hydraulic servo system takes the output of the actuator as the control quantity, mainly to solve the following problem of the control quantity, and realize the timely tracking of the control quantity to the given quantity under the premise of ensuring...

AI Technical Summary

Problems solved by technology

The shortcomings of these driver implementation methods are: first, the AD conversion accuracy of the hydraulic cylinder displacement signal is limited, and it is not suitable for the displacement feedback of long-stroke hydraulic cylinders. For example, the 16-bit precision AD chip must achieve 0.01mm displacement feedback accuracy. The stroke can only be limited within 600mm; second, the high precision and high speed requirements of AD conversion make it difficult to realize the driver, and at the same time, there are relatively few AD chips that meet the conversion rate of 1ms and the accuracy of more than 16 bits, and the cost is high; third, The use of a distributed structure requires technicians to have a high hardware and software foundation. For example, if the industrial computer mode is used, technicians need to be familiar with data acquisition cards and industrial computer programming application technologies. Single-chip system hardware and software programming application technology

In summary, the above deficiencies greatly limit the application of electro-hydraulic servo drive technology

The patented servo controller with the application number 200710125448.6 realizes the closed-loop control of the servo system through the closed-loop control unit, the drive unit and the single-chip microcomputer setting unit. Facilitate the promotion and use of servo controllers

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