280 Cutting Gearbox
High-Power · High-Torque · Highly Reliable Heavy-Duty Mining Cutting Drive System
The 280 cutting gearbox is a high-power, heavy-duty mining gearbox designed for cutting motors with power ratings up to 280 kW. It is specifically engineered for the cutting units of boom-type roadheaders, shearers, and continuous miners. Utilizing a parallel-shaft/planetary gear transmission configuration, this model features a high gear ratio, high output torque, robust overload capacity, and high reliability. It ensures stable operation of the cutting drum for coal and rock breaking under complex working conditions, including hard rock, mixed coal-rock, and pure coal seams.
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Core Technical Parameters
|
Item |
Parameter Value |
|
Matching Cutting Motor Power |
280 kW |
|
Maximum Motor Input Starting Torque |
5,402 N·m |
|
Rated Input Torque |
2,701 N·m |
|
Service Factor |
2.5 |
|
Nominal Gear Ratio |
27 |
|
Input Speed |
990 r/min |
|
Output Speed |
Approx. 37 r/min |
|
Rated Output Torque |
68,500 N·m |
|
Elevation Angle Range |
-24.8° to +39.5° |
|
Gradient Adaptability Range |
-27° to +25° |
|
Rotation Direction |
Unidirectional; short-term reverse rotation permitted |
|
Design Service Life |
≥ 20,000 h |
|
Cutting Drum Diameter |
1,050 mm |
|
Recommended Lubricant Grade |
VG 320 |
· Ultra-High Output Torque: With a nominal gear ratio of 27 and a rated output torque of up to 68,500 N·m, it delivers powerful drive force for hard rock cutting.
· High Power and Load Capacity: Designed for a 280 kW cutting motor, it withstands a maximum starting torque of 5,402 N·m. With a service factor of 2.5, it maintains ample overload margin to handle impact loads such as cutting head jamming or rock-biting. ·Low-speed, high-torque output: An output speed of approximately 37 r/min enables the cutting drum to maintain stable cutting under low-speed, heavy-load conditions, thereby enhancing coal/rock breaking efficiency and reducing cutter wear.
· Wide operational adaptability: Supports an elevation angle range of -24.8° to +39.5° and a gradient range of -27° to +25°, making it suitable for tunneling operations on downhill and uphill slopes, in level roadways, and in steep-gradient roadways.
· Short-term reverse rotation capability: While designed for unidirectional operation, it supports short-term reverse rotation to facilitate extraction and troubleshooting in the event of a cutter head jam.
· Long service life and high reliability: Designed for a service life of ≥ 20,000 hours; utilizes VG 320 heavy-duty industrial gear oil to ensure adequate lubrication of bearings and gears under heavy-load, low-speed, and high-temperature conditions.
Application Areas
Cutting units for boom-type roadheaders (e.g., EBZ series)
Shearers for thin coal seams, medium-thick coal seams, and steep-gradient working faces
Rapid tunneling equipment for hard rock and mixed coal-rock roadways
Integrated mining and tunneling equipment sets requiring high-power cutting capabilities
Operation and Maintenance Highlights
Lubrication and maintenance
The initial oil change is recommended at 500 hours; subsequent changes should occur every 2,000 hours or based on oil analysis results, using VG 320 gear oil. Oil temperature should be maintained between -20°C and 95°C.
Oil level monitoring
Check oil level, oil temperature, and for the presence of metal debris at every shift change; inspect seals for leakage.
Temperature monitoring
It is recommended to install temperature sensors at key points on the bearing housing and gearbox casing to provide real-time feedback on operating status.
Overload protection
Motor current rises sharply if the cutter head jams; the system should be used in conjunction with motor overload protection and soft-start or variable-frequency drive (VFD) devices.
Periodic inspection
Focus on inspecting gear meshing surfaces, bearing clearances, seal wear, and the torque of casing fasteners.
Value and Advantages
The 280 cutting gearbox is positioned as the "power heart" of high-power excavation and mining equipment, characterized by high power, high torque, low-speed output, wide-angle adaptability, and long service life. It significantly enhances the machine's cutting efficiency and operational reliability in complex geological conditions, reduces unplanned downtime, and enables mine operators to achieve efficient, safe, and low-consumption green mining.
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