1. Introduction

Under the background of the rapid development of industrial production today, the demand for the transportation of various materials such as coal and ore is growing. As the core equipment for material transportation, the stable operation of the conveyor is crucial. The BPQJ-(400, 250)/1140S explosion-proof and intrinsically safe combined frequency conversion starter for conveyor tensioning device is mainly used in coal mines with explosive and dangerous environments such as coal dust and gas, and is used for frequency conversion speed regulation of AC motors. This product is a new generation of tension control frequency converter independently designed and developed by Wantai Co., Ltd. for the control system of underground belt conveyors in coal mines. It is especially suitable for the dynamic analysis of belt conveyors. On this basis, it provides real-time online, optimized and perfect tension control solutions for belt conveyors, so that belt conveyors are in the best operating state. Driven by such demand, the explosion-proof and intrinsically safe combined frequency conversion starter came into being. In recent years, with the increasing requirements of coal mining, chemical industry and other industries for safe production and automation control, traditional starters can no longer meet the needs. The new flameproof and intrinsically safe combined variable frequency starter for conveyor tensioning device has one four-quadrant variable frequency output, multi-voltage and multi-circuit power frequency output capabilities, and is compatible with 127V low-voltage power supply requirements. It can adopt closed-loop vector control technology with encoder or open-loop vector control technology without encoder, which is suitable for asynchronous motors and permanent magnet synchronous motors. It has the characteristics of large starting torque, high speed regulation accuracy, long power supply distance, energy saving and high efficiency, safety and reliability. With its unique advantages, it has become the focus of industry attention.

2. Excellent characteristics of tension control inverter

• Optimized distribution of tension force: Based on the dynamic analysis of the belt conveyor, it provides a real-time online and optimized tension force control solution for the belt conveyor, so that the tension force of the belt conveyor can be adjusted in real time and the distribution can be optimized. Through the real-time adjustment of the tension force, the inherent vibration and slippage of the belt conveyor can be effectively solved;
• The tension force has a fast response speed, high control accuracy, and a large adjustment range: the intelligent frequency conversion control center realizes the adjustment of the tension force of the belt conveyor by controlling the matching mode of the tension winch, with a fast response speed, high tension control accuracy (±1KN), and a large adjustment range. It is suitable for adjusting the tension force of belt conveyors of various specifications and complex working conditions;
• High degree of intelligence: The tension force control system adopts perfect control logic. After simple parameter settings are completed, it can be automatically put into use, and the tension is automatically adjusted, with a high degree of intelligence. Real-time display of belt tension value and adjustment process;
• High degree of informatization: It has a rich communication interface, supports most protocols such as Modbus RTU and Ethernet, can be connected to any industrial control system, and uploads, stores, and records the relevant data of the belt conveyor to form an analysis data platform, which is convenient for data research and construction of the Internet of Things;
• High reliability: The inverter core circuit board has undergone rigorous high and low temperature experiments and waterproof, dustproof and anti-corrosion treatments, and can adapt to various harsh environments. The inverter process layout design is scientific and reasonable, and the overall equipment is tested in strict accordance with inspection specifications and standards (simulating on-site working conditions) before leaving the factory, and the performance of the complete set of equipment is reliable;
• Strong human-machine interaction: Equipped with a new human-machine interface, the display is flexible and changeable, the operation is simple and easy to learn, and it is more friendly and humanized, with parameter setting, status display, operation trend chart display, fault recording and storage functions;

3. Wide Application and Future Prospects

At present, Wantai's flameproof and intrinsically safe combined variable frequency starter for conveyor tensioning devices has been widely used in many places with flammable and explosive gases, such as underground coal mines and chemical workshops. In underground coal mines, it ensures the stable operation of coal conveyors and greatly improves the efficiency and safety of coal mining; in the chemical industry, it also provides reliable power support for various material conveying systems.

Looking to the future, Wantai will further improve the operation and maintenance efficiency of equipment and provide customers with safer, more energy-saving and more efficient products.