Shearer is the leading equipment in underground mining production, due to its high concentration of electrical system, many types of components, failure is not easy to troubleshoot, and its maintenance has always been a difficult point.
In line with the principles of practicality, intelligence, environmental protection and energy savingXinshida cooperated with a leading enterprise in the coal industry to jointly design and build an intelligent test benchIt provides accurate data detection support for the maintenance and remanufacturing of shearers, and ensures the stability and reliability of the equipment.
Figure 1-1: Remanufactured Coal Machine**.
The test bench was selected as XinshidaAS700 series four-quadrant inverterIt provides effective support for the torque, temperature rise and other index tests in the process of returning the shearer equipment to the factory for maintenance, which helps to improve the detection efficiency and maintenance quality of the shearer control electrical parts, and reduces the labor intensity of employees.
First, the platform system composition
The entire test bench system is adoptedProfinet communication network controlThe new AS700 series four-quadrant inverter has successfully achieved localized substitution, through which the test bench can switch between electric mode and feedback mode. The block diagram of the system is as follows:
Figure 1-2 Block diagram of the test bench system.
Second, performance advantages
For the re-factory repair and remanufacturing of shearer equipment, the test bench plays a key role, and the new Shida AS700 series four-quadrant inverter has the following features:
It is composed of LCL filter unit + AFE rectifier feedback unit + inverter unit, which can not only realize energy feedback to the power grid, but also must meet the provisions of GB T 14549-93 power quality "Harmonics of Public Power Grid" and "IEEE519" standardsThe inverter should have no harmonic influence on other control cabinets of the body control system;
The control algorithm is superior, which can realize closed-loop vector open-loop vector control, and can be switched freely
The running speed can be directly set, and the torque limit function can be provided
The internal current sharing control of the inverter avoids the unbalanced energy consumption of each control unit
It has the function of PROFINET communication control, and can realize the communication and switching of two sets of motor parameters
Full torque at zero speed, the torque can be preset at zero speed and can be adjusted freely, the adjustment range is 1%-100%, and the torque limit error is less than 3%.
Third, the test bench system operation
The test bench has high requirements for torque accuracy, and this time the inverterThe torque output fluctuates at 100% or less, the torque output is accurate to 001. To improve the given accuracy of torque, the output current waveform of the inverter is close to the sine wave, and the current sharing state of each unit is normal.
Figure 1-3: Torque fluctuation is less than 1%.
Figure 1-4 Waveform of the output current of the inverter.
Figure 1-5: Load the inverter in one and two.
Figure 1-6 Load the motor in one tow and two in two.
Figure 1-7: Swingarm traction loading inverter.
Figure 1-8 Rocker Traction Test Bench.
Fourth, summary
This test bench totals3 sets of test systems, the new AS700 series four-quadrant inverter was selectedThere are two voltage levels of 380V and 690Vproducts. Among them, the cutting part and traction rocker arm test system are powered by 690V power supply, which is used for the step-by-step loading and full load test of the rocker arm and traction parts of the shearer of 1400kW and below, which can meet the factory test test of the cutting parts and traction parts of the current mainstream shearer power modelsThe loading inverter of the one-to-two inverter test system adopts 380V power supply, which can meet the daily inverter loading and power generation two modes switching test within 150KW, and the inverter adopts AFE rectifier common DC power supply, and the energy is fed back to the power grid during the loading process to improve energy utilization.
With the development of the economy, the scale of the coal industry continues to expand, and it is urgent to improve the level of scientific and technological production in the coal mining industry. Following the development needs of the industry, Xinshida has made a breakthrough in the application of four-quadrant inverter energy-saving technology in coal mining machinery and equipment, which has greatly improved the degree of automation of the system, and provided strong support for helping coal mining enterprises reduce costs and increase efficiency, and promote the sustainable development of enterprises