Rubber, a highly elastic polymer material, is widely used in industry and life, such as vehicle tires, insulated cables, children's toys, etc., are made of it. However, in the face of the severe situation of global energy shortage, the rubber industry as a high energy consumption industry, the energy consumption problem it faces has been urgent.

1.Item information

Shandong Tire Co., Ltd. is a set of tire manufacturing, sales and ancillary products in one rubber company. The annual capacity of the company reaches 3 million sets of all-steel truck tires and 80,000 sets of all-steel, skew rubber engineering tires, and more than 12,000 strips of all-steel, skew rubber giant tires and 600,000 industrial vehicle tires, with an annual output value of more than 6 billion yuan. According to the different use environment, they have manufactured a variety of series of high-quality tires with long-distance wear resistance, mine special type, short and medium distance bearing capacity, which have been widely praised by users in domestic and foreign markets.

2.Customer's difficulties

Rubber mixing equipment plays an important role in the production process of the tire industry. As tire enterprises belong to high energy consumption enterprises, more than 40% to 60% of their energy consumption is consumed in the rubber mixing workshop, so the key to reducing the energy consumption of the tire industry is the rubber mixing equipment. The smelting machine mainly relies on two relatively rotating rollers to produce extrusion and shearing action on the rubber, after several kneading and the chemical action accompanying the kneading process, the macromolecular chain inside the rubber is broken, so that the various ingredients in the formula are mixed evenly, so as to meet the requirements of the rubber mixing.

Schematic diagram of the open mixer

The open mill is a constant torque load characteristic. In different stages of rubber mixing, the load changes greatly, so it is necessary to quickly respond to the operation of the equipment caused by sudden load changes. At the same time, due to the high ambient temperature and large oil pollution, the production has brought certain challenges.

3.Field operation effect

The original production line of the owner's unit uses a 245kw asynchronous motor, but due to its low energy efficiency (0.85) and poor comprehensive electricity economy, in response to the national call for energy conservation and emission reduction, it is recommended that they now replace the FGI FD300 series low voltage frequency inverter. The rotor field oriented vector control method is used to speed the motor with large torque, high precision and wide range, which makes it resistant to high temperature and humidity corrosion, not easy to demagnetize, high reliability and powerful function.

After use, the overall efficiency is increased to about 0.95, while the rated output current of frequency conversion is 590A, and the peak current in the production process reaches 1100A without stopping the equipment due to overcurrent. FGI FD300 series low voltage frequency inverter successfully opened the mill for frequency conversion transformation, to minimize energy consumption, improve economic benefits and production efficiency, to ensure the safe operation of the opening equipment, fully demonstrating the important position of frequency conversion speed regulation technology in industrial production.