1, can remove the old paint on the metal surface, with hot air nozzle and scraping tool when the use effect is better. 2. Self-adhesive stickers can be removed. 3, can remove rust or too tight nuts and metal screws; 4. Flexible plastic hose. 5. Before dealing with oil dirt or replacing old grinding powder, it can be softened first; 6, can be damp wood dry. 7, can shrink the packaging film, packaging tube. 8. Polyethylene for shrinkable metal connection; 9. Soften the welds Heat gun is mainly a tool for welding and removing components by using hot air blown from the gun core of heating resistance wire. According to the working principle of the heat gun, the main part of the control circuit of the heat gun should include the temperature signal amplifying circuit, comparison circuit, thyristor control circuit, sensor, risk control circuit, etc. In addition, in order to improve the overall performance of the circuit, some auxiliary circuits should be set up, such as temperature display circuit, shutdown delay circuit and zero crossing detection circuit. The temperature display circuit is set up for easy temperature adjustment. The temperature displayed by the temperature display circuit is the actual temperature of the circuit, and the worker can adjust it manually according to the temperature displayed on the display screen during operation. Adding shutdown delay circuit is mainly to improve the safety of the circuit. This circuit allows the gun core to be blown cold and then stop working, so as to avoid the excessive temperature of the gun core when the power is just turned off to cause harm to people or objects. Now there are some heat guns on the market that are not very demanding, without zero circuit, although they can work normally, but technically speaking, they are not perfect. The purpose of adding the zero crossing circuit in this design is to make the thyristor in the circuit at the zero crossing of alternating current, so as to avoid the silicon thyristor in the positive or negative half cycle high level of the turn-on to produce too high impact pulse wave, pollution to the power supply, and have an impact on other electrical equipment in parallel in the circuit.
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