Intermediate frequency electric stove

Intermediate frequency electric furnace is a power supply device that converts power frequency 50HZ alternating current to intermediate frequency (300HZ above to 10000 HZ). It is composed of frequency conversion device, furnace body, furnace front control and other parts.

Principle of intermediate frequency furnace equipment

According to the basic principle of electromagnetic induction, the three-phase alternating current into direct current, after rectification power frequency and direct current (dc) into adjustable intermediate frequency electric current, the supply is composed of capacitor and inductor load (coil and capacitance can be parallel, series), high density in induction coil in the magnetic field lines, and metal cutting in the induction coil, produce a lot of eddy current in the metal materials. This eddy current also has some of the properties of intermediate frequency current, that is, the free electrons of the metal itself flow in a resistive metal body to generate heat. , for example, put a metal cylinder has alternating medium frequency current in induction coil, metal cylinder has no direct contact with induction coil, electric coil temperature is very low, but the surfaces are heated to redness, and even melt, and the redness and melting speed as long as adjust the size and the strength of the current frequency can be achieved. If the cylinder is placed in the center of the coil, the temperature around the cylinder is the same, and the heating and melting of the cylinder does not produce harmful gases or light pollution to the environment.

Advantages of intermediate frequency electric furnace

1. The central control circuit board is optimized by computer, and the combination of large scale integrated circuit is optimized.

2. Components layout coordination and reasonable, easy maintenance;

3. On the basis of zero voltage starting, automatic frequency sweep and repeat starting function is added, the voltage and current loop circuit is closely tracked, the device starts and stops smoothly and stably, without current shock.

4. The inverter starting signal adopts single signal high sensitive trigger circuit, which further increases the starting performance of the equipment and makes the starting success rate of the equipment reach 100%.

5. Constant power circuit control system can adjust the voltage and current automatically at the optimal setting with the change of charge in the production without manual adjustment of the inverter cut-off Angle.

6. With perfect over voltage, over current, under voltage, water shortage, phase shortage, voltage and current limit protection system, so as to ensure the use of reliability and stability of the equipment;

7. Highly integrated circuit scheme, debugging and operation are fast, simple and easy to learn.

Intermediate frequency electric furnace features

Melting furnace

(1) High melting efficiency, good energy-saving effect, compact structure, strong overload capacity

(2) Low temperature around the furnace, less smoke, good working environment.

(3) Simple operation process, reliable melting operation.

(4) Uniform metal composition.

(5) Fast melting temperature, easy to control furnace temperature, high production efficiency.

(6) High utilization rate of furnace, convenient to change varieties.

(7) The long arc yoke shields magnetic flux leakage and reduces external magnetic resistance, and the magnetic flux leakage at both ends of the shielded coil and the cross section of the yoke are seamless and close to the outer wall of the arc, which increases the effective magnetic permeability area and provides better support for the lower ring. The unique positive and negative coil greatly improves the efficiency of the system.

Heating furnace

● Heating speed, high production efficiency, less oxidation and carbon removal, save material and cost, extend the life of the mold

Because the principle of medium frequency induction heating is electromagnetic induction, its heat is generated in the workpiece itself, ordinary workers can use medium frequency electric furnace to work after 10 minutes to carry out forging task of continuous work, do not need to burn furnace professional workers in advance and furnace sealing work. Due to the high heating speed of this heating method, oxidation is very little. The oxidation loss of intermediate frequency heating forgings is only 0.5%. The oxidation loss of gas furnace heating is 2%, and the coal furnace reaches 3%. Its material utilization rate can reach 95%. Due to uniform heating and small temperature difference between core and gauge, the forging life is greatly increased in forging. The surface roughness of the forging is also less than that of the 50um process, and the energy saving of intermediate frequency heating is 31.5% ~ 54.3% as compared with oil heating, and 5% ~ 40% as compared with gas heating. Good heating quality can reduce the rejection rate by 1.5%, increase the production rate by 10% ~ 30% and prolong the life of the die by 10% ~ 15%.

● Superior working environment, improve workers' working environment and company image, pollution-free, low energy consumption

Compared with coal furnace, induction heating furnace, workers will not be subjected to the baking and smoking of coal furnace under the scorching sun, more can meet the requirements of the environmental protection department, and set up the external image of the company and the development trend of the forging industry in the future. Induction heating is the most energy-saving heating method in electric heating furnace. The power consumption of tons of forgings heated from room temperature to 1100℃ is less than 360 ℃.

● Uniform heating, core table temperature difference is very small, high temperature control precision

Induction heating its heat in the workpiece itself so heating uniform, the core table temperature difference is very small. The application of temperature control system (as shown in the figure below) can achieve accurate temperature control to improve product quality and pass rate.