DDB Multi-Point Grease Pump for Coal Mining Machinery

Major underground and open-pit coal mines in China operate core mining machinery under 24/7 three-shift heavy-duty continuous working conditions.

Mining sites feature extremely harsh operating environments: dense coal dust, coal sludge accumulation, drastic temperature fluctuations ranging from -40℃ to 80℃, constant impact vibration, plus stringent explosion-proof safety standards for underground operations. Traditional manual greasing via grease guns brings multiple prominent drawbacks:

• Lubrication points on individual mining machines are scattered; manual greasing easily leads to missing lubrication, insufficient grease supply or excessive grease overflow, frequently triggering bearing dry friction, overheating and seizure.
• Manual maintenance requires equipment shutdown, drastically cutting effective production time. Greasing at elevated positions or narrow underground roadways creates safety hazards such as falling objects and collisions.
• Coal dust and sludge penetrate friction pairs of bearings, doubling the wear rate of hinge pins and bearings, resulting in frequent replacement of wearing parts and soaring costs for maintenance and spare components.
• Without standardized quantitative grease feeding, grease waste is severe. Full-time lubrication staff must be assigned, generating long-term high labor and operation costs.

A complete automatic lubrication scheme tailored by DDB to accommodate heavy load, explosion-proof and wide-temperature working conditions in coal mines:

Core Unit: DDB Series Hydraulic Multi-Point Grease Pump

1. Power Structure: Full steel grease reservoir and pump body, driven by hydraulic motor. Stable power output with outstanding anti-vibration performance, compatible with unified hydraulic oil supply systems of mining equipment.

2. Oil Outlet Configuration: Each outlet is equipped with independent overpressure protection. Blockage of a single circuit will not disrupt grease supply to other points, and automatic pressure relief protects the pump body when local overpressure occurs.

3. Sealing & Pipeline Design: Fully enclosed pipeline delivery blocks coal dust and sludge from invading friction pairs. The pump body adopts an integrated sealing structure equipped with multiple oil seals and O-rings for dustproof and waterproof performance.

1. Optimized Labor Cost: Dedicated lubrication teams are eliminated, cutting lubrication maintenance manpower by 90%. Frequent maintenance shutdowns are avoided, boosting effective equipment production time by 13%.

2. Reduced Grease Consumption: Precise quantitative grease feeding via plungers eliminates waste caused by manual overfilling, lowering grease consumption by 32%.

3. Stable Operation Under Extreme Conditions: The pump runs continuously and reliably across multiple mining sites, enduring frigid open-air winters at -40℃, high-temperature heading faces up to 80℃, and heavy dust & sludge environments with an extremely low failure rate.