Common fault analysis of annealing furnace


Annealing furnace reversing valve and shut-off valve part

After the fault occurs, an alarm prompt will appear on the top of the monitoring main screen. According to the prompt content, the faulty equipment can be preliminarily determined. The alarm details are as follows: V101 valve position alarm, V105 valve position alarm, heating section gas reversing alarm, heating section air reversing alarm, The gas reversal alarm in the insulation section and the air reversal alarm in the insulation section. Among them, the V101 valve is the gas quick-cut valve in the heating section, and the V105 valve is the gas quick-cut valve in the heat preservation section. Each device consists of an action part and a valve position feedback part. The action part is actuated by a solenoid valve with pneumatic components.

Troubleshooting: After the above alarm occurs, first check the color displayed by the alarm device on the main monitoring screen to determine its status.

If the quick-cut valve is displayed in yellow, the reversing valve is displayed in red “X”, that is, the stroke is not in place, check whether the stroke is out of the device, if not, you can open the travel switch to check whether the cam is out of position in the stroke. Adjust it so that the spring plate can be pressed at the larger arc.

If the quick-cut valve or the reversing valve is displayed as one of red or green, it can be judged that its stroke is normal, and the focus of investigation is on the action part. When checking the action part, first observe whether one of the two plugs of the solenoid valve is on, if both are not on, it is an electrical fault. Then, if one of them is bright, you can remove the two plugs, and use the bright plug to insert and pull out the two solenoid valve sockets in turn. If the cylinder does not move, it is a mechanical failure. If the cylinder moves, it is an electrical fault.

Second, the regulating valve part

The regulating valve can refer to its associated temperature to judge whether the equipment is working normally. If there is a fault, first turn off the working power in the power control cabinet, open the on-site valve cover, and rotate the valve body with an Allen wrench after confirming that the module in the valve is not electrified. If the rotation feels stuck, it is a mechanical failure, if it feels smooth, it is an electrical failure.

3. The analog part

The analog quantities here refer to temperature, pressure and flow. Except for the air mains pressure and the gas mains pressure, the other analog quantities are not involved in the control.