Vacuum coating machine vacuum pipeline preparation before evacuation and pipe fittings evacuation introduction is the pre-coating process of vacuum coating machine. The workpiece needs to be coated, and the pre-phase is to go through the cleaning process. If the customer chooses the coating process cleaning process to be carried out in the vacuum coating machine, then the vacuum tube Vacuuming the road is the first step of the vacuum coating machine coating. Many people are very interested in the preparation before vacuum line evacuation and the introduction of vacuum pipe evacuation process. Today, Huicheng Vacuum Editor will introduce you in detail:

        ICrl8NigTi, as the material of the evacuated process pipeline, is also the same as the material used for the evacuated pipeline. The stainless steel of this material has a small gas output, good weldability and brazing properties, and stable chemical properties. The pipe rack (or platform) used in the evacuation equipment must be stable and stable in working condition.
       Preliminary preparation:
      (1) The main pump unit and leak detection unit shall be qualified by professionals;
      (2) Prepare to replace helium and high-purity nitrogen;
      (3) Prepare circulating water (cooling water);
      (4) Prepare power supply and cables;
      (5) Prepare auxiliary supplies for evacuation and leak detection, including standard leaks, leak detectors, vacuum grease, vacuum sealing mud, spray guns, air bags, etc. Standard leaks and gauges should meet the measurement requirements;
      (6) Install the evacuated process pipe and connect it with the main pump unit and the leak detector. When installing, the bolts are evenly tightened and tightened symmetrically to ensure reliable sealing;
      (7) Install pipe racks or platforms that support the pipes to be drawn;
      (8) Install vacuum gauge and vacuum gauge;

       Brief introduction of vacuum pipe fittings evacuation process of vacuum coating machine The two different evacuation situations of "re-evacuation" in 1995 and 1999 and "reduced pressure rise, partial recovery of vacuum" in 2002 are introduced as follows.
       Introduction to the re-vacuum process
       The pumped pipe fittings are put on the shelf: the process evacuation valve should be installed in the center, the position should be appropriate, and the leak detection here, using helium injection method, the position of the leak is determined by the position of the spray gun, and the box cover method is used for suspected points Leak detection. After being qualified, close the valve between the process evacuation pipe and the leak detector. After closing the process valve and stabilizing for 2 minutes, record the vacuum pressure of the tooling tube at this time and record it as pl; then open each group of sealing valves and stabilize the pressure for 1 min, and record the vacuum pressure of the sandwich and tooling tube at this time, which is recorded as pZ. Pipe fitting interlayer volume, a tooling pipe volume, filling the tooling and pipe fitting interlayer with gas, and performing nitrogen replacement before evacuation.
       The vacuum coating machine is equipped with a heating temperature measuring device: each group of middle pipe fittings are equipped with temperature measuring sensors on the outer wall, and a number of heating plates are evenly arranged at the bottom. The outer cover is covered with asbestos for heat preservation and heat insulation, and the heating chamber is sealed. The pipe heating temperature is controlled between 120oC and 150oC and sealed The temperature at the valve is not higher than 60°C (with cooling water circulation), and make a record. Heating of pipe fittings: connect the sealing valve with cooling water, pass water, and heat the product pipe fittings. After the temperature rises to the specified value, keep it for 48h 。The molecular pump unit is turned on to vacuum continuously, and the vacuum pressure of the unit and pipe fittings is recorded every lh.