A Knowledge Graph System for the Maintenance of Coal Mine Equipment

Table 1

Neo4j knowledge storage scheme.

Category	Use	Object scope
Label	Describe the concept of CMEM knowledge	CME category, maintenance plan category, fault-repair category, staff category, maintenance case category, and equipment-status category
Node	Describe knowledge entity of CMEM	Shearers, roadway boring machines, electrical maintenance workers, and so on
Edge	Describe the relationship among CMEM knowledge entities	Ownership relationship, father-son relationship, utilization relationship, causal relationship, parallel relationship, and so on