Research on Automatic Pressure-Holding and Flow-Limiting Device for Sealing Bladder Based on Embedded Platform

Jiawei Chen

doi:10.63313/FE.9007

Authors

Jiawei Chen School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo Henan 454003, China Author

DOI:

https://doi.org/10.63313/FE.9007

Keywords:

Single Chip Microcomputer, Grout sealing, Embedded platform, Pressure-Holding and flow-limiting, Cooperative control

Abstract

Gas drainage is a key measure to guarantee underground operation and miners' safety, while grouting hole sealing, as the principal technical method for gas drainage, still exists many technical problems. This paper develops an automatic pressure-holding and flow-limiting system based on an embedded platform, consisting of hardware and software designs. The hardware comprises a core control module based on STC12C5A60S2, an LCD1602 display module, a relay module, a pressure sensor, a flow sensor, a two-position three-way solenoid valve, and a check valve. For software design, C-language programming in the Keil uVision5 environment is adopted to realize communication with pressure and flow sensors and control of the relay module. Taking the "two-seal one-injection" pressurized bladder sealing process as an example, in the grouting and expansion stage of the sealing bladder, when the detected pressure and flow values are lower than the set thresholds, the STC12C5A60S2 chip outputs a low-level signal to the relay module, keeping the relay inactive; the circuit of the two-position three-way solenoid valve is disconnected, and the outlet of the solenoid valve is connected to the sealing bladder for normal grouting. When the detected pressure or flow value exceeds the set thresholds, the STC12C5A60S2 chip outputs a high-level signal to activate the relay module, connecting the solenoid valve circuit and linking the solenoid valve outlet to the atmosphere, thus shutting down the grouting pump. Similarly, in the stage of sealing fractures in the middle section of the bladder with non-coagulating flexible gel, grouting continues when the pressure is below the set threshold and stops when the pressure exceeds the threshold. The system automatically regulates grouting pressure within a certain range, enabling "secondary sealing" and "tertiary sealing". This system improves the reliability of grouting hole sealing by means of pressure maintaining and flow limiting, thereby effectively increasing the gas drainage concentration.

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