How to choose the right hydraulic pump for YUKEN injection molding machine
To choose a suitable hydraulic pump for YUKEN injection molding machine, you need to comprehensively consider the core elements such as working pressure, flow requirements, pump type, control method, installation and maintenance, and environmental FACTORS. The following are the specific steps and recommended models.：
- Clarify the requirements for core parameters
Working pressure
The working pressure of the hydraulic system of the injection molding machine is usually between 10-35MPa, which needs to be determined according to the mold closing force, injection pressure and other requirements.
Recommended model：
Medium and low pressure pumps (≤16MPa): PV2R series vane pumps (such as PV2R2-50, with a maximum pressure of 35MPa and a flow rate of 50L/min) have low noise and high efficiency.
High pressure scenario (≥21MPa): A series or AR series plunger pumps (such as AR22-FR01C-20, pressure range 2.0-16MPa, flow rate can be customized), high pressure resistance and long life.
Traffic demand
Calculate according to the flow requirements of the actuators (cylinders, motors) of the injection molding machine, and consider the system efficiency (generally estimated at 90%).
Formula: Flow rate (L/min) = displacement (cm3/rev) × rotation speed (rpm)÷1000.
Example: If you need a flow rate of 50L/min and a speed of 1500rpm, the displacement needs to be≈34cm3/Rev. You can choose PV2R4-76 (displacement 76cm3/rev, adjustable flow rate).
Speed matching
Ensure that the rated speed of the pump matches the drive motor to avoid overspeed operation.For example, the recommended speed of the PV2R series is 1500-1800RPM, and the A series is 1000-3000RPM. - Choose the pump type
Vane pump
Features: Low noise, wide flow range, suitable for medium and low pressure, low vibration scenarios (such as injection molding machine mold closing mechanism).
Recommended model: PV2R series single pump (such as PV2R1-23) or double pump (such as PV2R23-47), which can be combined to achieve greater flow.
Piston pump
Features: High pressure, high precision, suitable for high pressure injection or large injection molding machines.
Recommended models: A series (such as A37, displacement 37cm3/rev) or AR series (such as AR22, displacement 22cm3/rev), support variable control, energy saving and high efficiency. - Determine the control method
Quantitative pump
Suitable for simple systems with constant flow and low cost (such as G series gear pumps).
Injection molding machine application: minicomputer or auxiliary hydraulic circuit.
Variable pump
Pressure compensation control: The output flow rate is automatically adjusted with the pressure, which is suitable for constant pressure systems (such as clamping circuits).
Load-sensitive control: the flow rate is distributed according to the load requirements, and the multi-actuator system (such as injection molding machine injection and mold closing synchronization).
Recommended model: A10 series variable piston pump (such as A10-F-R-01-C-K-10, which supports pressure compensation and load sensitivity).
4. installation and maintenance considerations
Installation method
Flange installation: save space (such as PV2R series-F suffix model).
Base installation: high stability, suitable for vibration environment (such as A series-L suffix model).
Sealing and materials
Fluorine rubber (FKM) seals (such as PV2R series-FKM option) are required for high temperature or chemical media environments.
Nickel-plated anti-rust coating is optional for corrosive environments (such as A series-N suffix models).
Filtering requirements
Plunger pumps have high requirements for oil cleanliness, and it is recommended to use grade 9 (β-≥75) and inlet filtration ≥25µm.
5. Environment and budget balance
High temperature environment
Choose high-temperature-resistant seals and install an oil cooler to reduce the oil temperature to below 50℃.
Low noise requirements
Priority is given to vane pumps (such as PV2R series, noise <70dB) or silent plunger pumps (such as PV2R silent design).
Budget control
Gear pumps have the lowest cost, followed by vane pumps, and plunger pumps have the highest.Comprehensive decision-making based on long-term operating costs (such as energy consumption and maintenance).
- Quick reference of recommended models
Application scenario recommended model parameter example (pressure/flow) advantages
Injection molding machine mold closing mechanism PV2R2-50 14Mpa/50L/min low noise, high efficiency
High pressure injection system A37-FR01C-20 35MPa/76L/min high pressure resistance, long life
Multi-actuator synchronous control A10-F-R-04-C-K-10 load-sensitive control flow distribution as needed, energy saving
Economical small injection molding machine G-50 (gear pump) 25MPa/50L/min, low cost and simple structure
