structure

The carburizing furnace is composed of shell, lining, lifting mechanism of furnace cover, sealing fan for furnace, Muffle tank, heating element and electric control system. The shell of the furnace is made of welded steel plates and sections. The furnace lining is an energy-saving composite structure made of 0.6g/cm3 high-strength ultra-lightweight energy-saving firebrick, aluminum silicate fiber, diatom soil insulation brick and asbestos board. The furnace cover lifting mechanism is composed of motor, gear pump and other components. When the furnace cover is opened, just press the button on the control box, and the furnace cover rises at a speed of 30-70 mm/s. For safety, the lifting shaft is equipped with two stroke switches, when the furnace cover rises, the lower stroke switch automatically cuts off the main circuit power supply of the carburizing furnace control cabinet, so that the heating element is powered off and stops working, the upper stroke switch limits the height of the lifting shaft to prevent the lifting shaft from rising too high and falling out.

The furnace is equipped with a sealed fan on the furnace cover to stir the atmosphere in the Muffle tank and make its composition uniform, while making the furnace temperature tend to be uniform. There are also three process pipes on the furnace cover leading to the Muffle tank of the furnace: a three-head stainless steel drip device is installed on the top of a sleeve, from which methanol, kerosene or other organic liquids are injected into the furnace by the three-head drip device, and all kinds of liquids can be adjusted. The ammonia pores on the sleeve can be used to transport ammonia gas into the furnace for carbon and nitriding (the pipe mouth can be closed when no nitriding); A casing is a sampling tube, the upper part of the casing can be connected with a "U" glass tube pressure gauge, used to monitor the furnace Muffle tank function is to maintain the furnace pressure, to ensure the normal progress of carburizing or carbon, nitriding, it is made of heat-resistant steel (casting). The heating element is coiled by the electric thermal alloy wire and installed on the inner wall of the furnace lining. Outside the furnace, the temperature of the carburizing furnace is transmitted by the thermocouple inserted into the furnace through the compensation wire to the automatic temperature control cabinet. The temperature control cabinet automatically controls, adjusts and records the heating temperature in the furnace. The carburizing furnace is equipped with a cooling bucket (optional) for storing the treated parts, and the bucket cover is equipped with a sand seal groove.

Operating specification

1. Preparation before opening the furnace

1. Remove the carbon black in the furnace tank and check the sealing gasket.

2, check the circulation fan, motor, grease the bearing, cooling water jacket water.

3, check the thermocouple position and oil pressure lifting mechanism.

4, check titrator, methanol, kerosene storage.

2. Operating rules for furnace opening

1. Turn on the power switch.

2, adjust the automatic control device of the instrument is normal before allowing power heating.

3. When heating up, turn on the fan.

4, when the furnace temperature rises to 850 ° C, begin to drop kerosene (or methanol).

5, after the furnace temperature to the required temperature, cut off the power supply of the furnace and fan, in order to install the workpiece. Then close the furnace door, connect the fan and the furnace power supply, and operate according to the range.

6, after the workpiece is out of the oven, close the furnace cover, continue to leave the fan, cut off the furnace resistance wire power supply, drop a small amount of kerosene.

7. When the furnace temperature drops to 850 ° C, stop dripping kerosene.

8. When the furnace temperature drops to 600℃, stop the fan and cut off the power switch.