First, equipment overview and use:

This equipment is suitable for modern equipment for metal heat treatment under the principle of medium frequency induction heating under hydrogen. This product heating is a kind of static and constant frequency conversion device, which converts 50H z three-phase power frequency electric energy into single-phase intermediate frequency electric energy. This series of equipment applies the principle of electromagnetic induction. Under the protective gas environment, the workpiece is placed in an alternating magnetic field, which generates eddy current loss and generates heat, which meets the requirements of heating such as sintering and heat transmission. This heating method has the advantages of fast heating, less burning loss and low labor intensity, which can ensure product quality.

Fourth , the main technical parameters:

a)    Rated working power supply 3N 380V ± 20V , 50H z ± 1 Hz

b) Rated heating power is about 500kw (the actual heating power is steplessly adjustable )

c)Rated working furnace temperature 2350 °C (design furnace temperature 2400 °C)

d)     Heating rate ≤ 20 °C / min

e)      Instrument temperature control accuracy ≤ ± 2 ° C   

f) Thermometry 0-1000 °C thermocouple (automatic delivery) 1000-2500 °C infrared

g)    Temperature control method:  Manual control and intelligent program control (heating according to a given temperature rise curve)

h)    Temperature record: Small long chart recorder records temperature and industrial computer data record

i)  Working atmosphere: Hydrogen (hydrogen flow rate is not less than 20 m 3 /h , pressure is not less than 0. 0 4 M P a .)

j)           Protective atmosphere: nitrogen ( pressure 0.04MPa )

k)         Effective size in high temperature zone: Ф600×1500

l)           Heating element size Ф600×1500 (tungsten)

m)      Furnace type vertical

n)        Discharge method: upper discharge

o)         Vacuum pumping speed ≤ 0.5 hours

p)        Empty furnace cold state ultimate vacuum ≤ 10Pa

q)         Pressure rise rate ≤ 0.67 Pa/h

r)          Furnace surface temperature rise ≤ 30 °C

s)          Cooling water rated pressure 0.1~0.3M Pa

t)          Cooling water flow: approx. 15 m 3 /h

u)        Compressed air pressure 0.4-0.6 MPa

v)         Medium frequency heating parameters:

1   IF power frequency 2500HZ

2 Rectification mode: three-phase full control bridge rectification

3        Rated DC voltage: 510V

4      DC Current Rating: 500A

5        Rated output voltage: 750V-800V

6     Rated power: 500KW

7         Efficiency: ≥92%

8         Control method: digital integrated circuit control.

9        Trigger pulse: double narrow column pulse.

Protection method:

10         Overcurrent, overvoltage rectification pull inverter protection;

11         Shutoff, power blocking protection

12         Relay protection; RC , LC absorption protection

13         Fast fuse protection

14          Furnace temperature over temperature, overshoot protection, temperature sensor fault protection

15          System under water, water shortage, water temperature over temperature and water pressure ultra high protection

16          Protective gas underflow protection

Power adjustment mode:

17          Manual mode

18          PID adjustment, automatic working mode along the specified heating curve ( user specified ) .

Fifth, the principle, structure and characteristics

The equipment consists of a furnace body, a vacuum obtaining system, an electric control system, a vacuum control system, an intermediate frequency heating system, an aeration system, and a water cooling system. The device is a heat treatment device using medium frequency induction heating. The inside of the furnace body is provided with a spiral tube coil. When the coil is connected with an intermediate frequency current, an alternating magnetic field is generated. The metal charge induces an electric potential under the action of a magnetic field to generate a toroidal current. This current concentrates on the outer layer of the metal charge under the action of its own magnetic field, so that the outer metal charge has a high current density, thereby generating a concentrated and powerful The thermal effect has caused the metal to be heated to produce a high temperature of up to 2400 °C.