Medium frequency induction sintering furnace
1 , equipment composition
The medium frequency induction sintering furnace is mainly composed of a thyristor intermediate frequency power supply, a hydrogen sintering furnace and an automatic temperature control system. The composition of each part is as follows:
1. The thyristor intermediate frequency power supply consists of KGPS-250/2.5 250KW 2.5KHz power supply cabinet, electric heating capacitor cabinet, connecting copper bars and engine mechanism;
2. The sintering furnace is composed of a tank body, an inductor, an alumina, a zirconia refractory material, a tungsten crucible pot, an open return water tank, a hydrogen / nitrogen flow regulating valve control board, and a gantry;
3. The temperature automatic control system recommends the following methods:
3.1 , the temperature automatic control system is measured by the optical fiber sensor, controlled by the temperature regulator, and recorded by the recorder.
2 , the main technical indicators selection method of medium frequency induction sintering furnace
1 , inner diameter: φ 400 × 750 × 16
2 , intrinsic material: tungsten
3 , the highest sintering temperature: not less than 2200 °C
4 , temperature control accuracy: ± 10 °C
5 , power supply voltage: 380V , 50Hz , three-phase four-wire system
6 , working frequency: 2500Hz
7 , automatic temperature measurement, display, automatic recording
8. Furnace hydrogen protection, flow adjustable outlet, slag discharge
9 , with overcurrent, overpressure, lack of phase, insufficient water pressure, over temperature protection
10, the number of equipment 1
4 , sintering furnace structure description
Explosion-proof port: explosion-proof membrane , silicone rubber gasket and over-pressure hydrogen outlet.
Blasting test port: detecting the hydrogen purity outlet in the furnace.
Furnace body: two layers inside and outside, the outer layer is welded by 10mm thick 16Mn welding material. 8mm thick inner layer is welded 1Cr18Ni9Ti, increased reinforcing bars, to prevent excessive water pressure furnace liner deformed inner and outer layers, middle and bottom.
Furnace cover: its structure is the same as the furnace body.
Lens cover: A rotating structure is built in to prevent contamination of the lens by smoke in the furnace.
Hydrogen and nitrogen inlets.
Flange lens: equipped with a silicone rubber gasket in contact with the lid flange, quartz lens fixed to the upper flange, the lid is simply detached wing nut flange of the lens can be cleaned.
Temperature measuring bracket: Add infrared temperature measuring head, can do three-dimensional adjustment for aiming.
Furnace water outlet
10 , the lid inlet
11 , the furnace outlet
12 , the furnace cover lifting rotary hydraulic cylinder: built-in furnace cover lifting rotary sleeve , the furnace cover can be rotated 20mm and then rotated 0~90 degrees, the furnace cover rises during the rotation process.
13 、Folding foot pedal: arranged in two layers of misalignment , which can be used for workers to discharge materials. Due to the high squat, the pedals are arranged in two layers, three foot pedals on each floor, and the lower layer is for workers to take the upper layer. Use, the lower layer is used by workers to take the lower layer. After use, fold the foot pedal to prevent it from being heated by the sensor.
14 , the furnace inlet
15. Hydrogen, nitrogen, slag, and water discharge outlets.
16, sheathed thermocouple sealing means equipped with a silicone rubber strip, sealing flange.
17 , armored thermocouple protection tube: built-in thermocouple.
18 , insulated porcelain pillar
29 , porcelain pad bushings and porcelain washers: electrical insulation.
20 , induction coil .
21 , stainless steel trough support plate .
22 , tungsten 坩埚: φ 400 × 750 × 16
23 , zirconia refractory brick
24 , aluminum oxide refractory brick
25 , the middle of the engine inlet and flange , inside the fluoro rubber , O -ring and copper tube wire and through the cooling water.
27, stage: stage height from the ground work surface 1 8 M, from the height of the furnace opening 0.6M, 2.9M outside fenced overall height, the middle set Buti, Buti worktop and the steel plate surface with a pattern. Into, non-slip. A hydrogen and nitrogen control box is arranged on the side of the step ladder, and a rotor flow meter and a gas switching valve are arranged inside to switch the gas and adjust the flow rate. The gantry is made detachable and separated along the diameter of the furnace body, and the furnace body is placed. Once in place, close the stand and tighten with bolts.
5 , medium frequency induction sintering furnace heating element
The tungsten crucible heating element is used to heat the tungsten crucible by induction heating, and then the material to be heated is heated.
6 , medium frequency induction sintering furnace refractory
The refractory material between the inductor and the tungsten crucible consists of aluminum oxide and zirconium oxide. Since the inner layer is close to the tungsten crucible and the temperature is high, the zirconia having a refractoriness of 2600 ° C is selected as the refractory material. Since the outer layer has the heat insulating effect of zirconia as the refractory material and the temperature is lower, the aluminum oxide having a lower refractoriness and a melting point of 2050 ° C can be used as the refractory material. In this way, both the fire and heat insulation effect can be achieved, and the equipment cost can be appropriately reduced.
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