Excavator pump

Excavator pump as the power core of the hydraulic system, directly affecting the performance, efficiency and reliability of the equipment. The following is an analysis of the technical principles, mainstream types, brand comparison and selection suggestions:

First, the technical principle and core parameters

1, the principle of work

Mechanical energy → hydraulic energy conversion: through the reciprocating movement of the rotor / plunger to change the volume of hydraulic oil, generating pressure. For example, piston pump swash plate tilt angle changes drive the axial movement of the plunger to realize the suction and discharge process.

Key Equation:

Theoretical flow rate: Qt = V × n Q_t = V \times n Qt = V × n (displacement × speed)

Power: P = p × Q600 P = \frac{p \times Q}{600} P = 600p × Q (pressure × flow / 600, unit: kW)

2、Core Parameters

Displacement: output oil volume per revolution (e.g. 160-300ml/r), which directly affects the speed of oil supply.

Rated pressure: maximum pressure for continuous operation (e.g. 34MPa).

Peak pressure: the maximum pressure allowed briefly (e.g. 39MPa).

Speed: 2000-2500rpm commonly used for closed systems, 1800-2200rpm for open systems.

Volumetric efficiency: 92-96% of the standard for new pumps, below 85% need to be repaired.

Second, brand recommendation

1, Caterpillar (Caterpillar): high efficiency and durability, for high load conditions.

2, Kawasaki (Kawasaki): K3V series piston pump known for stability and cost-effective.

3, Rexroth (Rexroth): A2FE series of high-precision variable pump, precise control.

4, Baudouin (Baudouin): high-strength materials, suitable for extreme environments.

5、KSB：Multi-working condition adaptability, low failure rate.

Third, excavator pump performance advantages

1、Efficient energy saving

Through variable control technology, reduce unnecessary energy loss and improve fuel efficiency.

Optimize the matching of hydraulic system to reduce pressure loss and heat generation.

2、High reliability

Rigorous testing: through the durability test (such as 2000 hours continuous operation test) to ensure stability.

Sealing technology: adopts fluorine rubber seal to prevent oil leakage and adapt to high/low temperature environment.

3、Maintenance convenience

Modular design: pump body, bearings and other components can be replaced individually, reducing maintenance costs.

Troubleshooting: some models support pressure sensor monitoring, quickly locate the fault point.

Fourth, excavator pump application scenes

1、Earthwork: such as excavation, loading, leveling the site, need high flow hydraulic oil to drive the big arm, bucket.

2、Crushing operation: with the hydraulic crushing hammer, the pump needs to provide instantaneous high-pressure impact.

3、Special working conditions: such as plateau, extreme cold areas, JCB pumps through special materials and lubrication design to ensure performance.

Fifth, selection and maintenance recommendations

1、Selection of key points

2、Matching working conditions: according to the tonnage of equipment, the intensity of operation to choose the displacement (such as micro-machine 80ml/r, large machine > 400ml/r).

3、Pressure redundancy: the rated pressure needs to be 10-15% higher than the maximum demand of the system.

4, speed matching: to avoid excessive speed leading to cavitation (such as plateau operations need to lower speed).

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