When an accident suddenly occurs, it must be calm, calm, and properly handled so that the accident does not expand and the scope of influence is reduced. 

1. Mid-frequency furnace power failure   

The intermediate frequency furnace is powered off due to an accident such as overcurrent or grounding of the power supply network or an accident of the intermediate frequency furnace itself. 

When the control loop is connected to the same power source as the main circuit, the control circuit pump also stops working. If the water is stopped in the induction coil for more than 3min to 5min , the insulation of the coil will be damaged and cause an accident. To do this, several measures must be taken in advance when designing: 

1 ) City (tap water) water supply; 

2 ) high water tank water; 

3 ) The water driven by the gasoline engine or the water supplied by the battery to drive the water of the pump; 

4 ) The power supply of the water supply pump should have two sets of lines (there should be a set of relatively stable lines). In the open cooling water circulation system, the first two kinds of standby water sources are commonly used, and in the closed cooling circulation system, a third type of standby water source is commonly used. But no matter what kind of circulation, the fourth kind must be done. 

5 ) Due to power failure, the power supply of the induction coil is also stopped at this time. Therefore, the water supply in the induction coil only needs 20 % to 30 % of the water supply during normal power supply. The water tank capacity should be higher than 10 hours of the electric furnace when the power is off. The amount to consider. 

6 ) Within 1 hour of power failure time , cover the metal surface with charcoal to prevent heat dissipation and wait for continuous power supply. Generally, other measures are not necessary, and the temperature drop of the molten metal is limited. 

7 ) When the power failure time is more than 1h , solidification may occur in the small-capacity electric furnace metal liquid. The solidification of the molten metal in the crucible will limit the shrinkage of the lining and thus cause cracks in the lining.

This should try to avoid the solidification of the molten metal in the crucible. It is best to switch the power of the oil pump to the backup power source when the molten metal is still fluid, or use a manual backup pump to pour the molten metal out. →The design should consider the pit where the molten iron is stored. The blast furnace table directly forms the pit. The low furnace table should be stored in the pit because of the slag. However, it is still necessary to use the original furnace. Pit, because it is not necessary to dump the molten iron. 

8 ) When the cold charge starts to melt, the power is cut off, and the charge has not completely melted. Therefore, it is not necessary to pour out the furnace, so that it can remain in its original state, but it needs to continue to pass water, and wait for it to melt again when it is energized. 

2 , leakage 

Leakage accidents are likely to cause equipment damage and even endanger the human body. Therefore, it is necessary to do the maintenance and maintenance of the intermediate frequency furnace as much as possible to avoid accidents. 

1 ) When the alarm of the alarm device rings, immediately turn off the power, patrol around the furnace body, and check if the metal solution leaks. If there is a leak, immediately tilt the furnace to empty the molten metal. If there is no leakage, check and handle according to the leak alarm check procedure. If it is confirmed that the metal solution leaks from the lining and hits the electrode to cause an alarm, the metal liquid is emptied, the lining is repaired, or the lining is rebuilt. 

2 ) The leaking furnace is caused by the destruction of the lining. The thinner the thickness of the lining, the higher the electrical efficiency and the faster the melting rate. However, when the thickness of the lining is less than 1/3 of the original thickness , almost all of the thickness of the lining is a hard sintered layer and a transition layer. Without a loose layer, the lining is slightly quenched and quenched to produce fine cracks. This crack can crack the entire interior of the lining and easily leak the molten metal. 

3 ) Unreasonable method of building furnace, oven, sintering, or improper selection of furnace lining material, the furnace will be produced in the first few furnaces of melting. 

3 , cooling water accident 

1 ) The high temperature of the cooling water is generally caused by the following reasons: 

a . The sensor cooling water pipe is blocked by foreign matter, and the flow rate of water is reduced. At this time, a power outage is required, and a compressed air blowing water pipe is used to remove foreign matter (the pump stop time should not exceed 3 minutes ). 

b . The coil cooling water channel has scale. According to the cooling water quality , the coil water channel must be acid-washed once every 1 to 2 years, and the hose should be removed every six months to check the scale. If there is obvious scale blockage on the waterway, pickling is required in advance. 

2 ) The sensor water pipe suddenly leaks. The cause of water leakage is mostly caused by the insulation breakdown of the yoke or the surrounding fixing bracket. When this was found immediately outage, reinforced insulation breakdown at processing , currently in use is the best TSC-L ultra-high temperature insulation paint, because it is resistant to 750 [deg.] High temperature to ensure that the intermediate frequency furnace demanding operating conditions Insulating varnish will not lose its insulation performance due to high temperature carbonization, thus effectively preventing the breakdown caused by sparking. Once the copper tube is broken down, the FCAR copper crack fast repair agent should be used to seal the surface of the leak and reduce the voltage. The furnace charge is emptied, and the molten iron is emptied before the furnace is repaired. If the coil water channel is broken down in a large area, it is impossible to temporarily seal the leaking gap with the FCAR copper crack fast repairing agent, and it is necessary to stop the furnace, empty the metal liquid and repair it. Attached: Fixing bolts for the rotating seat of the furnace and the support of the hob, which need to be inspected once a week (fastening). Because the bolts are subjected to periodic tensile stress and shear stress during the tilting and lowering of the furnace, it is easy to fatigue fracture or loose to accelerate the fracture. In addition to the usual maintenance of the fastening bolt should be used in the production of high-strength material, and 1 year replacement 1 times.