1 inductor impedance matching design, and special eccentric thick-walled copper tube to reduce coil resistance loss. For the overall heating of the billet , the wall thickness of the copper tube of the inductor is generally 2 to 3 mm . Since the operating frequency of the large material of the project is 200 to 250 Hz, the optimum wall thickness of the copper tube is calculated to be 7.5 mm, which can significantly improve the efficiency of the inductor.

2 The sensor wiring board is 8mm thick , the conductive joint is polished, the surface is tinned and conductive paste is applied to reduce the contact resistance loss.

3 The inductor adopts series flat pressure design , and the induction coil is wound with 99.9% rectangular copper tube . It has higher heating efficiency than the parallel or boost design.

4 sensors are reasonably grouped. In this scheme, the billet is divided into 5 groups according to the outer diameter of the steel pipe . Such grouping can make the quenching heating efficiency of all steel pipes more than 0.7 ; the tempering heating efficiency is greater than 0.85 .

5 quenching uses dual-supply dual-frequency heating, which not only adjusts the flexibility to facilitate temperature uniformity ( core table . axial temperature difference ) , but also shortens the length of the inductor and improves the heating efficiency.

6According to the diameter of the workpiece and the heating tempo, the length of the inductor during quenching heating is designed according to the reasonable length. For φ 196.9 ~ 279.4 , the length of the sensor is 3X1800 , the supporting power supply is 750kW+250kW ; for φ 152.4 ～184.2 , the length of the sensor is 2X1800 . Supporting power supply 750kW ; for φ 88.9 ~ 120.7 supporting sensor length 1X1800 , supporting power supply 250kW ( 350kW ). Such a design is obviously advantageous for the improvement of heating efficiency and the rational use of resources.

7 The sensor output adopts wide copper row and water cooling method , and the area enclosed by the coil is as small as possible . The two poles of the copper strip are arranged as close as possible , and the inductor is connected with the capacitor cabinet with a wide copper strip to reduce the leakage of the tank. Pressure drop loss.

8 The power cabinet of this project is far away from the capacitor cabinet. In order to reduce the transmission loss of the intermediate frequency, we use the patented coaxial bus. The coaxial busbar not only has a very high transmission efficiency, but also does not interfere with the control line.

9 furnace lining is made of high-quality high-aluminum refractory material, the refractoriness is more than 1500 °C , and it has excellent heat preservation and cold and thermal shock resistance. A heat preservation cover is arranged at the furnace room and the discharge roller to effectively reduce heat loss.

We know that system energy conservation is “excavated” little by little in every aspect. We will use this as a guiding ideology, design should be standardized, materials should be reasonable, and production should be fine .

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