A motor loaded hydraulic motor performance test apparatus

Abstract

The utility model discloses a kind of hydraulic motor performance test equipment of motor loading belongs to hydraulic test technical field.The equipment adopts modular design, mainly including hydraulic motor power module, control module, test module, man-machine interactive control module and energy recovery module.When testing, adjustable load is provided for the measured motor by loading motor, and performance data is collected using torque speed instrument;Part of electric energy in testing process is recycled through energy recovery module, test temperature rise is controlled through specially designed motor flushing oil port, and a variety of models of hydraulic motor can be adapted by replacing conversion shaft sleeve.The equipment has the advantages of compact structure, energy saving and efficient, comprehensive test function, easy operation and maintenance.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic testing technology, specifically a device for testing the working performance of a hydraulic motor, and in particular a hydraulic motor performance testing device that uses an electric motor as a loading unit, has a modular structure and energy recovery function. Background Technology

[0002] Hydraulic motors are key components in engineering machinery, mining equipment, and other fields, making performance testing before shipment crucial. Currently, most common testing equipment uses magnetic particle brakes to provide the load for the motor under test. This approach has several drawbacks: the magnetic particle brake has a complex internal structure and large size, resulting in low integration and difficult maintenance of the entire testing system; the magnetic powder is prone to fatigue and caking after long-term use, potentially causing equipment jamming; the overall energy consumption is high; and its performance is highly dependent on an external high-precision constant current source, limiting its practicality. Furthermore, existing equipment is mostly an integrated design, making it inconvenient to transport and move, and difficult to troubleshoot. Rapid motor temperature rise during testing can easily lead to internal structural sintering and seal failure. Therefore, it is necessary to improve existing technology. Utility Model Content

[0003] This invention aims to overcome the shortcomings of existing technologies and provide a hydraulic motor performance testing device that is compact, easy to maintain, energy-efficient, and can effectively control temperature rise. The device adopts a modular design and motor loading method, and features energy recovery functionality.

[0004] To solve the aforementioned technical problems, the present invention adopts the following technical solution: a hydraulic motor performance testing device with electric motor loading, the overall structure of which adopts a modular design and mainly includes five functionally independent but collaborative modules: a hydraulic motor power module, a hydraulic motor control module, a hydraulic motor testing module, a human-machine interaction control module, and an energy recovery module. The modules are connected via hydraulic pipelines and electrical circuits.

[0005] The hydraulic motor power module mainly includes a hydraulic oil tank, a fixed displacement piston pump that provides power to the system, and a variable frequency motor that drives the pump. The hydraulic oil tank is equipped with a temperature sensor and a level relay to monitor oil temperature and level. This module is responsible for providing a stable and controllable hydraulic oil source for the entire testing system.

[0006] The hydraulic motor control module includes an independent control pump and control motor, primarily providing control oil circuits for the auxiliary functions of the motor under test. This module has dedicated control ports, including: a brake control port for controlling a motor with a brake, a variable displacement control port for adjusting the displacement of a variable displacement motor, and a motor flushing port for providing continuous flushing flow to the motor under test to remove internal heat. Through components such as the module's pressure reducing valve and three-position four-way directional valve, the pressure and on / off state of the aforementioned control oil circuits can be precisely adjusted.

[0007] The hydraulic motor testing module is the core component for performing the test. It includes a test platform for mounting and securing the motor under test (DUT) and a motor mounting bracket. The output shaft of the DUT is connected to the input shaft of a torque tachometer via a conversion bushing and coupling. The torque tachometer is used to acquire the torque and speed data of the DUT in real time. The output shaft of the torque tachometer is then connected to the input shaft of a speed increaser via another coupling, and the output shaft of the speed increaser is connected to a loading motor. By adjusting the operating state of the loading motor, the required resistance torque can be applied to the output shaft of the DUT, simulating actual operating load conditions. The test platform is a cast iron platform.

[0008] The human-computer interaction control module provides manual and automatic testing modes, and can set test parameters, display system status, and save test data.

[0009] The human-machine interface control module, presented in the form of a control cabinet and touchscreen, serves as the interface for operators to control equipment, set parameters, and observe data. This module offers both manual and automatic testing modes. In manual mode, operators can adjust parameters such as loading pressure and system flow rate in real time. In automatic mode, after the operator selects the test item and inputs the target parameters, the equipment automatically completes the testing process. This module can also display the system status in real time, such as oil temperature, oil level, valve status, and alarm information, and is responsible for saving the test data.

[0010] The energy recovery module is key to achieving energy conservation. Its core lies in mechanically connecting the loading motor, speed increaser, torque and tachometer, and the motor under test in series via a coupling. During testing, the motor under test drives the loading motor and speed increaser, at which point the loading motor acts as a generator, outputting electrical energy. This energy is processed by a rectifier and then fed back to the variable frequency motor driving the fixed displacement piston pump via a common DC bus technology, thereby recovering some energy and reducing the amount of electricity directly drawn from the grid.

[0011] Compared with existing technologies, this invention offers the following advantages: The five functional modules are relatively independent, smaller in size than traditional integrated equipment, facilitating handling, layout, and troubleshooting. Each module can be maintained independently or adapted for other applications, improving equipment utilization. By introducing an energy recovery module, some mechanical energy generated during testing is converted into electrical energy and fed back, effectively reducing testing energy consumption and aligning with green development principles. This invention allows a single device to complete multiple tests, including no-load running-in, displacement measurement, volumetric efficiency, total efficiency and mechanical efficiency, variable characteristics, low-speed performance, and impact testing, covering the main performance indicators of hydraulic motors and significantly improving testing efficiency. It provides both manual and automatic testing modes, balancing the flexibility of R&D debugging with the automation needs of batch testing. Data is automatically saved in automatic testing mode, reducing human error. This invention uses a dedicated motor flushing port in the control module to inject cooling oil into the tested motor, continuously removing heat generated by friction and preventing damage due to excessive temperature rise, ensuring testing safety and accuracy. Furthermore, by equipping it with various models of conversion bushings, it can easily connect hydraulic motors of different interface sizes and types for testing, expanding the equipment's applicability. It can simultaneously monitor multiple parameters such as torque, speed, multi-channel pressure, flow rate, and oil temperature, providing reliable data support for a comprehensive and accurate evaluation of motor performance. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a schematic diagram of energy recovery according to the present invention.

[0015] Figure 3 for Figure 1 An enlarged schematic diagram of the human-computer interaction control module.

[0016] Figure 4 for Figure 1 An enlarged schematic diagram of the hydraulic motor testing module.

[0017] Figure 5 for Figure 1 Enlarged schematic diagram of the hydraulic motor control module.

[0018] Figure 6 for Figure 1 Enlarged schematic diagram of the hydraulic motor power module.

[0019] In the diagram: 1 is the hydraulic oil tank, 2 is the fixed displacement piston pump, 3 is the variable frequency motor, 4 is the control pump, 5 is the control motor, 6 is the cooler, 7 is the loading valve group, 8 is the motor under test, 9 is the torque tachometer, 10 is the speed increaser, 11 is the loading motor, 12 is the human-machine interface control module, 13 is the test platform, 14 is the conversion bushing, and 15 is the coupling. Detailed Implementation

[0020] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings and specific test items.

[0021] The following is an example: It is necessary to test the overall efficiency and mechanical efficiency of a variable hydraulic motor.

[0022] Step 1: Installation and Connection The motor 8 under test is fixed to the motor mounting bracket of the test platform 13 with bolts.

[0023] Based on the size of the output shaft and the keyway type of the motor under test, select a suitable conversion bushing 14 and connect it to the output shaft of the motor under test and the coupling 15 respectively.

[0024] Connect the coupling 15, torque and tachometer 9, speed increaser 10 and loading motor 11 in sequence to form a complete mechanical transmission chain.

[0025] Connect the inlet and outlet oil ports of the motor under test to the main oil circuit of the test system, connect its variable control oil port to the corresponding oil port of the hydraulic motor control module, and connect its flushing oil port to the motor flushing oil circuit of the control module.

[0026] Step 2: Parameter Settings and Test Startup The operator selects the "Motor volumetric efficiency, mechanical efficiency and total efficiency test" item on the touch screen of the human-machine interaction control module 12.

[0027] In the parameter setting window, enter parameters such as the target test pressure range, test rotation speed, and loading gradient.

[0028] Select "Automatic Test" mode to start the test.

[0029] Step 3: Automated Testing Process The system first starts the hydraulic motor power module, and the variable frequency motor 3 drives the fixed displacement piston pump 2 to supply oil to the system.

[0030] The hydraulic motor control module starts, providing control pressure to the variable displacement mechanism of the motor under test, so that it is in the displacement state required by the test.

[0031] At the same time, the motor flushing oil circuit of the control module is opened, injecting cooling oil into the motor.

[0032] After the system pressure is established, the tested motor begins to rotate. The human-machine interface control module controls the loading motor 11 to gradually increase the load torque according to the set loading gradient through the motor frequency converter.

[0033] At each stable load point, the system synchronously collects data such as inlet pressure, outlet pressure, leakage flow, main flow, output torque, and speed through pressure sensors, flow sensors, and torque-speed meters.

[0034] While applying load torque, the loading motor is in a power generation state. The generated electrical energy is rectified by the rectifier and then supplied to the variable frequency motor driving the fixed displacement piston pump through the common DC bus.

[0035] Step 4: Data Processing and Conclusion After the test is completed, the system automatically calculates and displays the volumetric efficiency, mechanical efficiency, and total efficiency at each operating point, and can plot the efficiency curve.

[0036] All test data and curves are automatically saved to the specified location.

[0037] The system was uninstalled, and each module was shut down in sequence.

[0038] Throughout the test, the level relay and temperature sensor continuously monitored the oil tank status, and the cooler automatically started and stopped according to the oil temperature to ensure the safe and stable operation of the system.

[0039] Through the detailed description of the above embodiments, the core working principle and functional integration of this utility model are specifically realized. Its technological innovation is mainly reflected in the following collaborative operation mechanism: This invention is based on the physical and logical decoupling of five functional modules. Each module—hydraulic power, control, testing, interaction, and energy recovery—has its own independent mechanical structure, hydraulic circuit, and electrical interface, enabling rapid docking and disassembly via standardized quick-connect couplings and aviation plugs. This design not only facilitates handling, layout, and fault isolation and maintenance, but also allows each module to function as an independent functional unit, adaptably applied to other testing systems or equipment, achieving "one module, multiple uses" scalability.

[0040] This invention abandons the traditional passive energy-consuming magnetic powder brake and adopts a loading motor as an active load unit capable of four-quadrant operation. During testing, the loading motor operates in torque control mode, precisely applying the required resistance torque to simulate working conditions; simultaneously, it functions as a generator, converting the mechanical energy output from the hydraulic motor into electrical energy. This electrical energy, after rectification, is directly fed back to the variable frequency motor driving the hydraulic pump via a common DC bus technology, forming a partial closed-loop energy cycle of "hydraulic energy—mechanical energy—electrical energy—hydraulic energy," significantly reducing net energy consumption to the external power grid.

[0041] In this invention, the human-machine interface control module acts as the "nerve center," unifying and coordinating the setting, adjustment, and acquisition of multi-dimensional parameters such as pressure, flow rate, torque, speed, and temperature. Through integrated testing software, complex testing logic, such as stepped loading in efficiency testing and waveform generation in impact testing, is transformed into automated control command sequences, driving the coordinated action of actuators such as hydraulic valve groups, frequency converters, and loading motors. This enables a single device to automatically complete multiple items from no-load running-in to impact testing according to a preset program, achieving a multi-dimensional, one-stop comprehensive evaluation of hydraulic motor performance.

[0042] To address the issue of excessively rapid motor temperature rise during testing, this invention integrates an independent flushing control oil circuit into the control module. The oil in this circuit, after being adjusted to a suitable pressure and flow rate by a pressure reducing valve, is continuously injected into the motor housing under test, directly carrying away the heat generated by internal friction and hydraulic losses. This function operates in parallel with the main testing process and is uniformly managed by the control system, achieving decoupling and synchronization between the testing process and thermal management. This effectively prevents motor overheating damage and ensures the continuity and safety of the test.

[0043] Faced with a wide variety of hydraulic motor models, the test module solves the physical compatibility problem of the output shaft interface by being equipped with a variety of conversion bushing libraries. Combined with the T-slots and adjustable brackets on the cast iron test platform, a flexible mechanical mounting interface is formed, which can quickly and securely clamp motors of different shapes and shaft extension types, greatly improving the versatility of the equipment and the efficiency of test preparation.

[0044] In summary, this utility model, through the organic integration of the above five core mechanisms, constructs a high-efficiency, energy-saving, intelligent, and universal hydraulic motor performance testing platform, systematically improving the technical level of the testing equipment in terms of structure, energy consumption, function, reliability, and applicability.

[0045] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A performance testing device for a hydraulic motor under electric motor loading, characterized in that, include: Hydraulic motor power module, hydraulic motor control module, hydraulic motor testing module, human-machine interaction control module (12) and energy recovery module; The hydraulic motor test module includes a test platform (13) for mounting the motor under test (8), a torque tachometer (9) for collecting torque and speed data, a loading motor (11) for applying load, and a speed increaser (10) located between the torque tachometer (9) and the loading motor (11). The energy recovery module includes a rectifier and a common DC bus, used to recover the electrical energy generated by the loading motor (11) during the test and supply it to the hydraulic motor power module.

2. The hydraulic motor performance testing equipment under motor loading according to claim 1, characterized in that, The hydraulic motor control module is equipped with an independent control oil circuit, which includes at least a motor brake control oil port, a motor variable control oil port, and a motor flushing oil port.

3. The hydraulic motor performance testing equipment under motor loading according to claim 1, characterized in that, The human-computer interaction control module (12) provides manual test mode and automatic test mode, and can set test parameters, display system status and save test data.

4. The hydraulic motor performance testing equipment under motor loading according to claim 1, characterized in that, The hydraulic motor test module is equipped with various types of conversion bushings (14) to adapt to the connection between different types of motors (8) under test and couplings (15).

5. The hydraulic motor performance testing equipment under motor loading according to claim 1, characterized in that, The hydraulic motor power module includes a fixed displacement piston pump (2) driven by a variable frequency motor (3).

6. The hydraulic motor performance testing equipment under motor loading according to claim 1, characterized in that, The loading motor (11) is connected to the output shaft of the speed increaser (10) via a coupling (15), and the input shaft of the speed increaser (10) is connected to the torque tachometer (9) via a coupling (15).

7. The hydraulic motor performance testing equipment under motor loading according to claim 1, characterized in that, The test platform (13) is a cast iron platform.

8. The hydraulic motor performance testing equipment under motor loading according to claim 2, characterized in that, The motor flushing port is used to inject cooling oil into the motor under test to control the temperature rise during the test.

Images