Electrical control device and hydraulic control device in runway surface friction coefficient testing car

Abstract

The invention discloses an electrical control device and a hydraulic control device in a runway surface friction coefficient testing car, relating to an automatic controller system, wherein the electrical control device comprises an upper computer, a lower computer, a relay, a power supply, a printer, an amplification conditioning module, a sensor, a signal converting circuit, an auto speed pulsesignal exit side and a braking signal exit side; wherein the upper computer is an industrial control computer the lower computer is a PLC computer, and the sensor comprises a horizontal force sensor,a vertical force sensor and a water pressure sensor. The hydraulic control device uses a hydraulic cylinder two-way connecting vessel and is composed of a hydraulic pump station, a three-position four-way electromagnetic directional valve, a pressure testing adapter, a hydraulic energy storage, a hydraulic cylinder, an electromagnetic directional ball valve, a hydraulic lock, a valve block and a travel switch, wherein the hydraulic cylinder is a two-way connecting vessel and consists of a rodless cavity, a rod cavity, a piston and a piston rod in the hydraulic cylinder. The invention greatly increases the measurement response speed, the control ability and the data processing ability and obviously reduces measurement errors.

Description

technical field [0001] The technical proposal of the invention relates to an automatic controller system, specifically an electric and hydraulic control device in an airport pavement friction coefficient testing vehicle. Background technique [0002] At present, the measurement methods of pavement friction coefficient used at home and abroad can be divided into four types: the braking distance method, the pendulum method, the rotary method and the test vehicle method. Compared with the other three types of methods, the test car method is the most reliable method for determining the friction coefficient, so this method is widely used. The SAAB friction coefficient test vehicle (SFT for short) produced in Sweden and the Grip Tester friction coefficient test vehicle produced in Scotland are the friction coefficient test equipment commonly used in the world at present, and these two test equipment are mainly used to measure the friction coefficient of road surfaces in my country...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: to provide the electric and hydraulic control device in the test car of friction coefficient of airport pavement, wherein the electric control device adopts advanced upper computer industrial control computer and lower computer PLC, which overcomes the existing airport pavement friction The electrical control device of the coefficient test vehicle has insufficient measurement response speed, control ability and data processing ability, which leads to the shortcomings of slow output and printing speed of the friction coefficient and curve; the hydraulic control device adopts a hydraulic cylinder two-way connector, which overcomes the existing The pressure holding value of the hydraulic control device of the airport pavement friction coefficient test vehicle cannot be stabilized at a constant value, resulting in a certain measurement error.

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