Working principle of fiber laser cutting machine

The use of fiber laser cutting machine to cut elevator sheet metal is mainly to concentrate the laser beam in the cutting machine on a certain point on the surface of the sheet metal material. After the laser is emitted, the light energy is converted into heat energy, and the concentrated beam Higher heat than a single beam will occur. Heat with very high energy will reach the melting point of the sheet metal material in a short time. After reaching the melting point, it will quickly climax as the boiling point. At extremely high temperatures, the sheet metal material will be melted. , And then gasification occurs. After the raw material is gasified, precise holes will be excavated at the point where the laser beam shines. While the holes are being excavated, the fiber laser cutting machine is already selected for the movement of the laser beam according to its own guiding function. The preset movement path is established, and precise movement is performed along the fixed preset path. With the movement of the laser beam, the surface of the sheet metal material that touches the laser beam will continue to undergo melting, liquefaction, and vaporization reactions. With the continuous excavation of this kind of change, the place where the laser beam has moved, that is, the place where the surface of the sheet metal raw material touches the laser beam, will dig out the slits, that is, laser cutting is realized.

In order to achieve the gate results, the buttons between the inner and outer doors of each console control should be interlocked, that is, when driving the outer door, pressing the inner door control button does not raise the way and vice versa. In order to prevent equipment damage caused by simultaneous driving between different consoles, the construction of the three consoles should also be interlocked. When one of the consoles is driving, in addition to the emergency stop button, the other two consoles should be ineffective. At the same time, the guide lights on the three consoles should be synchronized.

In order to allow personnel in the containment to exit more quickly, when the outer door console and the inner door console are driving at the same time, the signal of the inner door console has priority.

3 Electronically controlled internal and external door interlocking

In order to arrive at the internal and external doors that cannot be opened at the same time, a mechanical interlock is unilaterally constructed to make one door open while the other door is open. Can't move. In the past, the gates relied too much on mechanical interlocking, and there was no interlocking in the electric control. The power station has repeatedly discovered that the mechanical interlocking is invalid in certain specific environments during the operation process, resulting in an environment where the internal and external doors are double-open. Therefore, the electronic control system is necessary The interlocking result of the special inspection of the state of the door body comes in. Under normal circumstances, a closing trigger travel switch is built in the closing part of the gate body. This limit switch can be used to avoid double opening of the gate to a certain extent. The detailed method is: when performing electric driving to open the inner (outer) door, the electric naive should be used first before opening the inner (outer) door. Detect whether the outer (inner) door close limit switch signal is triggered, and the door can only be opened when the door body is closed. Judging from the application environment of air gates for power station personnel in the past, because the electronic control system trusts mechanical interlocking devices too much, in the absence of the above control logic, the gates have been double-opened several times, leading to the excavation of all nuclear power plants. The above-mentioned interlock can improve the unilateral redundant interlock detection of the electric control under the control of the electric control, and improve the reliability of the gate.

4 Environmental parameter interlocking requirements

To ensure the safety of personnel, and at the same time, for the personnel already in the containment to be able to withdraw from the containment quickly, the temperature inside the containment is higher than 50℃ When the gauge pressure crosses 0.1MPa, the button for opening the outer door on the outer door console is invalid, and the button for opening the inner door in the gate compartment is invalid. During the driving process of the personnel air gate, after the pressure balance valve is opened and before the door is opened, the pressure difference between the inside of the gate and the outside of the containment shall be judged. If the pressure difference is greater than 0.01MPa, the motor shall stop working. When the pressure difference is less than 0.002 MPa, the motor starts and the door opens.

The fiber laser cutting machine analyzes the various results of the air gate for guarantee personnel, and the interlocking requirements that should be considered in its electrical control. At the same time, it analyzes the empirical response to the control requirements of the nuclear power plant application gate. Similar decision-making reference to reduce negligence and carelessness in decision-making.