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Correct Operation Procedures and Daily Maintenance of Box Resistance Furnace

This article mainly describes the correct operation steps and daily maintenance of box-type resistance furnace. Today, we give an example of a temperature box-type resistance furnace in Nortel Technology.
box furnace
1. Preparing before start-up
(1) Check whether there are tools or other conductive substances in the electric control box. If there are forgotten workpieces in the furnace, they should be removed in time.
(2) Check whether the switch contacts are normal after closing.
(3) Check whether the temperature control instrument works properly and turn on its switch to keep it in working state.
 
2. BOILING PRODUCTION
(1) Set the temperature of the automatic temperature control instrument according to the technological requirements.
(2) Put the control "handle" in the position of automatic control to raise the temperature.
(3) The cold furnace can be heated for 2 hours, and then the workpiece can be loaded. Continuous production is allowed, and continuous charging is allowed.
(4) Workpieces should be placed evenly and smoothly in the furnace. No contact between workpieces and electric heating wires is allowed.
_Operate strictly according to the process regulations.
 
3. Stop the furnace
Turn off the instrument switch and turn on the power switch.
 
4. Cautions for Box Resistance Furnace Operation
(1)When the temperature of the furnace is higher than 400 C, it is not allowed to open the door of the furnace for intense cooling.
(2) The maximum operating temperature should not exceed 950 C.
(3) The charge quantity should not be too large, and the temperature reduction should not be greater than 50 C.
 
(4)Don't use too much force when loading the furnace, so as not to damage the bottom of the furnace.
(5)Always pay attention to whether the electrical work of the instrument and the electric control box is normal.
(6)_New or overhauled furnaces should be installed at room temperature for 2 to 3 days and nights after decoration. The resistance of three-phase electric heating elements to the ground (furnace shell) should be greater than 0.5M by checking with 500V megohm meter. The electric power can be supplied and baked according to the following process. The cover plate of the furnace shell is removed during the process of closing the oven door at 750-800 8h, closing the oven door at 500-600 8h and closing the oven door at 750-800 8h at 100-200 15-20h, so that the water vapor in the masonry body can be easily released.
(7)_After a month of new overhaul or installation, the diatomite at the top of the furnace should be checked, and if it sinks, it should be filled again.
 
5. Maintenance of Box Resistance Furnace
(1). Always pay attention to the lining and resistance wire bracket tiles, find out the damage and repair it in time.
(2) Check the situation of the electric heater wire frequently, if it is found that there is contact between the two wires, it should be separated in time.
(3) Check the clamp tightening of resistance wire lead rod every month, remove oxide skin and tighten the clamp in time.
(4) Clean the furnace every week to remove oxides and workpieces thrown into the furnace.
_Check the use of lifting steel wire of furnace door regularly, and replace it in time if damage is found.

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