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Standard Model Analysis of MWD / MWC / KWD / KWC Mining Hydraulic Excavators
2026-07-21Standard Model Analysis of MWD / MWC / KWD / KWC Mining Hydraulic Excavators
- Compilation Basis
All model codes comply with Chinese coal industry standard MT/T 154.1 issued by China Mining Products Safety Approval and Certification Center (aqbz.org). Two certification categories: MA for gassy coal mines, KA for metal & non-metal mines.
1.1 Standard Letter Code Definition
| Code | Full Name | Certification Scope |
| M | Mining Equipment for Coal Mine | MA safety certification required |
| K | Mining Equipment for Metal Mine | KA safety certification required |
| W | Trackless Excavator | Underground hydraulic digging machine |
| D | Electric Explosion-proof Drive | Zero emission motor for gassy tunnels |
| C | Diesel Explosion-proof Drive | National IV flameproof diesel engine |
| L | Tracked Chassis | Universal crawler suffix for all models |
| A/B | Modified Version | Upgraded boom & structural variant |
1.2 Four Series Official Definition
- MWD: Electric Explosion-proof Tracked Excavator for Coal Mine (MA certified)
- MWC: Diesel Explosion-proof Tracked Excavator for Coal Mine (MA certified)
- KWD: Narrow Low-profile Electric Excavator for Metal Mine (KA certified)
- KWC: Narrow Low-profile Diesel Excavator for Metal Mine (KA certified)
1.3 Standard Model Format for Certification
Format: MW/KW-Operating Weight(t)/Bucket Capacity(m³) L(Modified Code)
Rule: Weight figure comes first, bucket volume second, fixed sequence for official safety certificate filing.
1.4 Standard Model Examples
- MWD6/0.3L: 6t electric explosion-proof digger for coal mine, 0.3m³ bucket
- MWD6/0.3L(A): Upgraded rotating arm electric excavator with revised certification
- MWC7/0.35L: 7t diesel flameproof digger for long inclined coal roadways
- KWD12/0.4L: 12t compact electric excavator for narrow metal mine tunnels
- 1/0.2L: Mini 4.1t narrow diesel digger for ultra-limited metal workings
- MWD2/0.12L: Mini 2t electric excavator for small coal excavation tunnels
1.5 Core Model & Certification Differences
- MWD (Coal Electric, MA)
Zero-emission explosion-proof motor complying with GB3836 standards, designed for high-gas coal roadways. Mandatory MA safety mark before underground operation, powered by 660/1140V explosion-proof cables. - MWC (Coal Diesel, MA)
National IV flameproof diesel engine with spark arrester, cable-free flexible movement for long-distance tunneling & inclined shafts. Prohibited under excessive methane concentration. Full electrical system MA certified. - KWD (Metal Electric, KA)
Slim low-profile body with superior trafficability for non-gassy metal mines. Only KA certification required, clean electric power for continuous excavation work. - KWC (Metal Diesel, KA)
Compact narrow diesel excavator without power supply restriction, dedicated for metal mine wall trimming, floor leveling & roadway renovation. Only KA safety mark is needed.