Product Introduction:

1. The PLZ series microcomputer controlled dual axis radial fatigue testing machine for load-bearing wheels adopts a three-phase asynchronous motor and frequency converter to control the speed. A fixed friction pair wheel is installed on the inner side of the test wheel, and a certain load is applied to the radial surface of the wheel. A lateral force is applied in the transverse direction to check the durability and fatigue performance of the wheel. Parameters such as speed, descent, mileage, judgment conditions, and stopping conditions can be set in the control software. The wheel rotates in a drum while loading axial and lateral forces. The true values of the measured wheel load status are collected at the load integration point using mathematical statistical calculation methods. Integrate data and store it in the testing control software. By classifying and organizing the integrated data under load conditions,

2. Thus, by conducting a fatigue test of only 10.000 km on each wheel, the results can be obtained after driving for a typical distance of 300000 km.

3. The electromechanical drive system of the biaxial radial fatigue testing machine provides load force and lateral force. The control system consists of an industrial computer equipped with programmable memory, which performs system operations and device monitoring through a display screen and keyboard or mouse.

According to the standard:

1. QC/T 221 Performance Requirements and Test Methods for Automotive Light Alloy Wheels

2. GB/T 5334-2005 Passenger Car Wheel Performance and Test Methods

Product Structure:

1. The testing machine consists of four parts: the main engine, hydraulic oil source, variable frequency speed regulation, and microcomputer control system. The main engine part includes the machine base, frame, main loading cylinder part, lateral loading cylinder part, rotating wheel part, sample part during installation, and rotating speed control part.

2. The hydraulic oil source is a combination of a three-phase asynchronous motor and a high-pressure oil pump. The hydraulic oil pump outputs hydraulic oil through a proportional low servo valve, which controls two hydraulic cylinders respectively. One applies radial load and the other applies lateral load, coordinating work and servo control.

3. The microcomputer control part adopts multi-channel servo control mode for industrial control, and the control and pump station parts are connected by control cables and hydraulic hoses.

4. Working principle

4.1 The principle of this testing machine is as follows

Three asynchronous motors are fixed on one side of the machine as drivers, connected together by V-belts and pulleys as transmission mechanisms, driving the wheel hub to rotate. The speed can be set by a frequency converter. The wheel hub is installed on the main body and fixed by two supporting bearings. There are two auxiliary supporting wheels on the front panel to support the large wheel hub. Radial loading relies on a hydraulic cylinder to control the magnitude of the force through a servo valve. In terms of lateral force, a hydraulic cylinder is fixed on the moving seat for loading, and the radial test force is coordinated and controlled to achieve the experimental purpose.

4.2 The test time, number of times, magnitude of test force, magnitude of lateral force, and displacement can be freely set on the software.

4.3 The machine is equipped with protection functions such as pressure protection, displacement protection, test force protection, oil temperature protection, etc. If there is a problem, the machine will automatically shut down and give an alarm message.

5. Sample installation

The tested wheels are fastened together with fixture blocks (quick change positioning fixture), and a device is set up to adjust the test space according to the different diameters of the tested wheels. The output rod is connected to the load cylinder piston rod, and there is a guide support at the output rod. The rod is connected to the guide and the test cylinder. There is a sensor at the output rod connection guide to measure the force, and the piston rod extends and retracts.

5. Measurement and alarm system

During the experiment, if there is a leak or tire blowout, the software will automatically detect and emit an alarm sound and prompt the alarm information.

6. Hydraulic oil source

On the side of the testing machine is the hydraulic oil source. Before use, 46 # anti-wear hydraulic oil should be added through a filter, and the amount of oil added should be such that the oil level is at the middle position of the oil gauge. All valves on the oil source have been adjusted before leaving the factory. Please do not adjust them without authorization. The oil change cycle for hydraulic oil is generally one year.

7. Experiment

7.1 Set the pressure, speed, frequency, and test time according to the test requirements.

7.2 Determine the type of experiment, choose dynamic reciprocating test or static load holding test, which can be set from the computer software. Start the oil pump, set the test parameters - install the tested oil cylinder, and click start test.

When the experiment is completed or there is an alarm for parameters exceeding the preset parameters, the machine will automatically shut down.

7.4 Remove the oil cylinder and report the test results.

The control system adopts our company's fully digital hydraulic servo controller.

Main configuration:

The digital controller based on DSP is an open architecture that can be configured at any time to adapt to testing and measurement using various application system plug-in modules to suit specific sensor types of cards. Embedded PC host to meet specific software requirements. The controller can be configured to synchronously control multiple servo loads and structures of the free vibration table, multiple workstations, and the host of supporting equipment. The controller adopts a fully digital hydraulic servo system with high-speed analog-to-digital converter (ADC) → digital data processing (DSP) → control simulation signal output (DAC); The system has a 32-bit data capture rate and a 32-bit digital waveform integrator, providing sine, triangle, and pulse waveforms ranging from 0.001 to 100Hz. It has a high integration and high-speed data transmission interface, as well as a USB transmission interface

Power control accuracy: ± 0.5%

Displacement control accuracy: ± 0.5%

Strain control accuracy: ± 0.25%

Control mode: stress/strain/stroke control

100 MIPS DSP controller

1 to 8 independent control channels

Download firmware and USB interface

Windows compatible application software

Main technical indicators of software

For detailed information, please contact the sales personnel.