Pre-vacuum chamber furnace

Forvacuum box-type furnace is a single-chamber structure, the workpiece is heated under a protective atmosphere, the temperature of the heating chamber atmosphere heat treatment process is controlled by computer PLC, without manual intervention, will minimize human disturbance factors, is an automated a high degree of heat treatment equipment.
Pre-vacuum chamber furnace design requirements:
Pre-vacuum chamber furnace designed according to customer requirements, mainly used for stainless steel precision castings annealing, the device considers factors:
1. Production capacity: customized according to customer requirements.
2. Operating temperature: commonly used temperature of 850 ° C -920 ° C maximum temperature 950 ° C
3. Smart meter + SCR temperature control system to improve the control precision, saving energy (more than 30% energy saving than the on-off), reducing the impact on power.
4. Additional protection medium injection device and furnace pressure, the injection volume of the dosing medium to protect the workpiece is not oxidized.
5. A four-link door seal structure, with water cooling jacket and silicone rubber sealing device to ensure that the protective gas in the furnace is not compromised, to ensure that the pressure in the furnace, the heat loss is not easy.
6. Using the drag-lift type of materials into and out of institutions, to reduce the weight of the material basket, to improve the life of the material basket, reducing costly heat-resistant steel consumption.
7. Heat-resistant steel mixing fans, the furnace temperature uniformity up to ± 5 ° C (air furnace), to ensure product quality.
8. Imports of the light impervious C brick, heated indoor layer to reduce heat loss, further energy savings.

Tube furnace fire accident occurred when oil disposal measures

1, the first self-adjusting valve from the gas bypass valve at the gas cut off, lower the fire, when off the gas slowly to prevent tempering explosion.
2, a heat exchanger from the rich oil-rich oil outlet valve is closed into a tube furnace at the oil-rich, to prevent leakage of oil-rich continue to make fire intensified. De-oil rich in benzene column close the valve at the inlet tube furnace oil-rich tubular pipes, the pipe and other pipe furnace off.
3, surrounded by oil spillages with sand to prevent the spread of fire.
4, if the fire is not possible to place the furnace fire steam, the muffle furnace steam valve to open hearth fire put out the fire.
5, from the door of the joints foam firehouse with fire hoses connected to the foam bubbles firehouse. Tube furnace with foam fire on parts of the fire.
6, the most critical to control the outflow of gas and oil-rich, to prevent the fire intensified.

 

Oven proper use instructions

The use of oven
1. Use of environmental requirements:
a) Temperature: 5 ~ 40 ℃
b) Relative humidity: ≤ 85% RH
c) Power supply voltage: AC220V ± 10% 50Hz
d) four weeks without a strong vibration and corrosive gases affect
2 vacuum debugging:
a) The box door and tighten the door handle in place, closed discharge valve (the rubber stopper holes with the holes on the release valve twisted partial 90 °), open the vacuum valve (by the counterclockwise rotation 90 °), the first time you use the vacuum valve switch may be tight, be forced to rotate.
b) Using random accessories vacuum connection tube (inner diameter: Φ16mm thickness: 10mm) vacuum drying oven exhaust pipe (diameter: Φ16mm) and a vacuum pump (2XZ-2 type, the inlet diameter Φ16mm) connected securely (6090 and 6210 already connected). Vacuum pump connected to the power and began pumping seriously empty table indicates values ??reached-0.1Mpa, the first closure of the vacuum pump valve closed after power to prevent vacuum pump oil to flow back into the studio, this time in a vacuum chamber.
3 oven vacuum box debugging:
In the vacuum, after debugging, can be manipulated as follows:
a) Turn the vacuum chamber, and the Power LED should light. Power On Self Test temperature controller, PV display the working chamber measuring temperature, SV display is factory set temperature. Temperature control device on the AT and HEAT and other lights should be lit, heated instrument to enter the working state.
b) to modify the set temperature oven
1 Click temperature controller function key (SET); PV display SP characters, the available key head button to set the temperature changes.
(2) After modification, press the SET button, PV display ST characters, set the timer time.
 If you do not use the timer function, you can still let ST = 0
3 Press the SET button, the screen display studio temperature PV, SV screen displays the new set temperature. AT AND HEAT instrument lights, then re-enter the meter heated working condition.
c) When operating the indoor temperature close to the set temperature, HEAT lamp light suddenly flickered, which means that the heating stage to enter the PID regulator, the instrument is sometimes measured temperature exceeds the set temperature, sometimes below the set temperature is normal. When measuring the temperature close to or equal to the set temperature, and then after the studio until 1 ~ 2h enter a constant temperature, goods enter the drying stage.
d) the desired temperature is low, the second setting mode can be used, such as the required operating temperature 70 ℃, the first time to set 60 ℃, and other temperature overshoot began to fall, and then the second set 70 ℃ , so that the temperature can be reduced or even Du do overshoot, as soon as possible to enter a constant temperature.
e) when the goods drying is complete, turn the power off, if accelerated cooling, then open the bleeder valve so that the vacuum is 0, for 5 minutes or so call box door.
(4) If the working chamber of dry matter humidity, water vapor generated will affect the performance of the vacuum pump is recommended between the oven and the vacuum pump, string into a "Dry / filter."
5 If the drying process of the article, you need to add nitrogen and other inert gases, should be specified in the contract, was equipped with an inlet valve.
(Note: 1. If the pump properly and meet the technical requirements, can not vacuum, then open the door to use the product in the annex to wrench the door button on the box screwed to the inside circle to close short, re-close the door. 2 This vacuum oven can not be used as an electric oven, because the studio is not in a vacuum state, measuring the actual temperature and the working chamber temperature error great)

Optimization atmosphere furnace cooling rate

Traditional depends mainly on the furnace atmosphere furnace cooling water circulation inside the sandwich away part of the heat, the cooling speed is relatively slow. Sometimes up to 36h or so to cool to about 150 ℃.
The high-performance cores require rapid cooling, the design presented in the following optimization program:
(1) Cycle Air Act: cooling the charge into the furnace through the nitrogen to pour out of the tower, and then into the furnace, recycled. Meanwhile, in order to prevent leakage, to continue to add part of the nitrogen gas into the furnace to ensure the nitrogen partial pressure in the furnace.
(2) Box bottom openings, and the cold side of the silicon molybdenum rod gap forming gas convection, take away box furnace heat;
(3) The box-type furnace purged with nitrogen, the heat away sintered product;
(4) accelerate the rate of water flow within the furnace sandwich. These types of programs can be used simultaneously, the cooling time can be shortened to about 15h.