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I. Product Overview
The Gear Pump Comprehensive Performance Test Bench is a specialised testing platform designed specifically for external gear pumps, internal gear pumps, cycloidal gear pumps, lubricating oil gear pumps and hydraulic gear pumps. As positive-displacement pumps, gear pumps exhibit characteristics such as high-pressure internal leakage, flow pulsation and low-speed start-up torque. This equipment departs from the generic control logic of standard pump test benches, instead optimising data acquisition algorithms and loading schemes to accurately replicate the actual operating conditions of gear pumps within hydraulic systems. The entire system employs a closed-loop hydraulic circuit, equipped with high-precision sensor acquisition units. Combined with a fully automated measurement and control system comprising a PLC and an industrial computer, it provides a one-stop solution for performance calibration, factory acceptance testing and durability and reliability verification. It is widely used by hydraulic component manufacturers, construction machinery suppliers and research laboratories to support new product development, factory quality inspection and batch consistency spot checks.
II. Core Test Items
1. Pressure–Flow Characteristics Testing: Measures output flow rate and inlet–outlet pressure differential under varying load pressures to perform multi-gradient pressure sweep tests; automatically plots pressure–flow characteristic curves to visually assess internal leakage under high-pressure conditions and evaluate gear clearance and housing seal performance.
2. Displacement and Efficiency Testing: Determines theoretical displacement under no-load conditions and actual displacement under full load, and calculates volumetric efficiency, mechanical efficiency and overall efficiency; quantify the degree of flow rate decay under high pressure, providing quantitative data for optimising gear machining accuracy and sealing solutions.
3. Torque and Start-up Characteristics Testing: Test operating torque and static start-up torque under different pressure loads, capturing torque fluctuations at low speeds; identify latent defects such as gear seizure, excessive frictional resistance and bearing wear.
4. Flow Pulsation Detection: Real-time monitoring of outlet pressure and flow pulsation coefficient to assess the smoothness of gear pump operation, meeting the testing requirements for products designed for low-pulsation conditions in machine tool hydraulics and precision lubrication systems.
5. Pressure Resistance and Sealing Performance Testing: Supports static pressure-holding tests to detect leaks at the pump casing, end caps and shaft seal locations, verifying the unit’s pressure-bearing capacity and sealing reliability.
6. Temperature Rise and Endurance Testing: Supports long-term endurance testing under alternating pressure cycles, continuously monitoring the temperature of the working fluid and the pump body to assess thermal stability and the wear life of components under sustained high-pressure conditions.
7. No-Load Running-In Test: Simulates factory running-in conditions by completing a no-load operation for a preset duration, thereby revealing assembly defects such as burrs and poor fit-and-finish at an early stage.
III. Core Advantages of the Equipment
1. Dedicated test logic tailored for positive-displacement gear pumps: Optimises sampling frequency and load regulation logic to address the characteristics of high-pressure internal leakage and flow pulsation in gear pumps, resolving the issues of significant deviations in internal leakage data and delayed detection of pulsation encountered with general-purpose test benches.
2. A closed-loop, temperature-controlled oil circulation system ensures stable and controllable operating conditions. The sealed hydraulic oil circulation system integrates cooling, precision filtration, and pressure-stabilising buffer components to maintain a stable medium temperature, eliminating test interference caused by oil temperature fluctuations on viscosity and leakage rates, and ensuring the repeatability of test data across multiple runs.
3. Wide operating condition compatibility covering multiple types of gear pumps. Supports external-meshing, internal-meshing and cycloidal gear pumps; It is compatible with low-pressure lubrication pumps and medium- to high-pressure hydraulic gear pumps for construction machinery; through rapid fixture changeovers, a single unit can be used for multiple product models.
4. Fully automated closed-loop testing is suited to mass production quality inspection with pre-set standardised test procedures. With a single button press, the system automatically adjusts pressure, applies load, collects parameters, generates characteristic curves and exports compliance inspection reports, thereby reducing manual intervention, minimising human reading errors and facilitating batch testing on assembly lines.
5. The modular, quick-change clamping structure features an adjustable mounting base paired with multi-size flange adaptors, enabling rapid assembly and disassembly of gear pump test specimens with varying installation dimensions and inlet/outlet port specifications, thereby reducing product changeover and commissioning time.
6. A multi-layered safety protection system integrates overpressure relief, overload protection, over-temperature shutdown, emergency stop self-locking, and audible and visual alarm functions; high- and low-voltage circuits are separated and shielded, supporting prolonged, uninterrupted endurance testing in the workshop.
IV. Overall System Composition
The complete system comprises a closed-loop hydraulic circulation unit, a precision load and pressure regulation module, high-precision pressure, flow, torque and speed sensors, an oil temperature control system, an electrical control cabinet, an industrial control HMI unit, and dedicated measurement and control software for gear pumps; it is supplied with auxiliary components such as quick-change fixtures, filters, safety relief valves and protective covers. Optional expansion modules include a noise and vibration acquisition module and a high- and low-temperature medium temperature control unit.
V. Scope of Application
Suitable for manufacturers of external gear hydraulic pumps, internal gear pumps, cycloidal gear pumps, oil-lubricated pumps, hydraulic pumps for construction machinery, and oil pumps for environmental sanitation equipment, as well as R&D laboratories and quality control departments. Used for performance calibration of new products, factory performance testing, leakage assessment, durability testing, and process optimisation verification.
VI. Delivery and After-Sales Support
Customised measurement ranges and functional modules are provided to meet the specific requirements for pressure, displacement and rotational speed of the gear pumps under test. The supplier offers on-site installation and commissioning, as well as hands-on training for operating personnel; a complete set of technical documentation in both hard copy and electronic formats (operating manual, electrical schematics, piping diagrams) is provided upon delivery. The complete unit comes with a one-year free warranty, lifetime technical support and maintenance services, with priority remote response to faults to ensure the continuous operation of production line testing.
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