1) Coal mine safety technology systems include gas drainage, ventilation reversal drills, reopening sealed fire zones, connecting unknown areas, and uncovering outburst-prone coal seams.

2) Gas drainage includes: district gas drainage (regulations, methods, precautions), mine-wide gas drainage (regulations, methods, precautions, single main fan, multiple main fans), gas drainage method - main fan ventilation drainage (regulations, methods, precautions), gas drainage method - natural ventilation drainage (regulations, methods, precautions), gas drainage method - auxiliary fan ventilation drainage (regulations, methods, precautions), gas drainage method - drainage system emission (regulations, methods, precautions).

3) Types of ventilation reversal drills include: mine-wide ventilation reversal drills (regulations, procedures, methods, precautions, single main fan, multiple main fans), regional ventilation reversal drills (regulations, procedures, methods, precautions).

4) Ventilation measurement work during reversal drills includes: ventilation measurement during reversal drills (regulations, procedures, methods, precautions, practical demonstrations).

5) Reopening sealed fire zones includes: conditions for reopening (regulatory provisions), reopening method - airlock reopening (airlock walls, airlock reconnaissance), reopening method - ventilation reopening, reopening areas (reopening mines, reopening districts, reopening working faces, reopening roadways), restoring ventilation in fire zones - reopening for gas drainage (gas extraction system drainage, ventilation drainage), restoring ventilation in fire zones.

6) Connecting unknown areas includes: connecting unknown areas (relevant regulations, relative relationship with connecting roadways), hand pick connecting, carbon dioxide blast connecting, roadheader connecting.

7) Uncovering outburst-prone coal seams includes: regulations for uncovering coal seams, pre-uncovering inspections, post-blasting work, emergency procedures for uncovering (fires, outbursts).

System Functions:

1. User login authentication;

2. The system is divided into training mode and assessment mode. In assessment mode, the system can submit user assessment results to the backend management system;

3. Supports user interaction with virtual equipment in the virtual environment via VR controllers;

4. Supports user navigation in the system through controller operation;

Technical Approach:

The system is developed using the Unreal Engine, leveraging PBR materials to realistically present the underground working environment in virtual reality, and employs particle systems to simulate effects such as water spraying and dust during operations.