Design of automatic measurement system for drill cuttings gas desorption index Δh2

In view of problems of many steps, low automation degree and more human interference factors in current measuring process of drilling cuttings gas desorption index Δh2 under different gas adsorption pressure conditions in laboratory, a high precision automatic measurement system for coal drill cuttings gas desorption index Δh2 based on single-chip microcomputer was designed. The system takes Atmega16 single-chip microcomputer as the core, and takes USART_HMI touch screen as input and output devices of system instructions. The single-chip microcomputer is used to operate various sensors, relays and solenoid valves to complete process of automatic degassing, adsorption, pressure relief and determination of coal samples through identifying touch screen instructions, so as to obtain final measured coal drill cuttings adsorption pressure desorption index Δh2 under different adsorption pressure conditions. The test results show that the relative error of the automatic measurement system is controlled within 5% compared with the existing coal drill cuttings gas desorption instrument,which has good practicability and data accuracy.