The ultimate goal of all welding equipment or tools is to get better solder joints. Selective wave soldering is a high-precision end-to-point soldering method among all soldering methods; in order to increase the quality and reliability of solder joints. All selective welding equipment is added with nitrogen protection part. Nitrogen is an inert gas, which can improve the wetting ability of the welding surface of the component and the printed board, reduce the degree of oxidation, and accelerate the welding reaction speed. Compared with welding in an air environment, welding in a nitrogen environment can theoretically reduce the required welding temperature, reduce process defects, and form good solder joints.
Under normal circumstances, there are some problems with nitrogen production opportunities as follows:
1) The air filter, freeze dryer, and air storage tank are not drained normally.
2) The freeze dryer is not refrigerating and no personnel find out in time.
3) There is no activated carbon degreaser at the front of the nitrogen generator.
4) A large number of black particles are ejected from the muffler of the nitrogen generator.
5) Some pneumatic valves are damaged.
The beverage nitrogen generator is based on the principle of pressure swing adsorption, using high-quality carbon molecular sieve as the adsorbent, and producing nitrogen from the air under a certain pressure. The purified and dried compressed air is subjected to pressure adsorption and decompression desorption in the adsorber. Due to the kinetic effect, the diffusion rate of oxygen in the micropores of the carbon molecular sieve is much greater than that of nitrogen. When the adsorption does not reach equilibrium, nitrogen is enriched in the gas phase to form finished nitrogen. Then the pressure is reduced to normal pressure, and the adsorbent desorbs the adsorbed oxygen and other impurities to realize regeneration. Generally, two adsorption towers are installed in the system. One tower absorbs nitrogen and the other tower desorption and regeneration. The PLC program is automatically controlled to make the two towers work alternately to achieve the purpose of continuous production of high-quality nitrogen.