Process control of electrostation automatic sprayer

Coating line using high-voltage electrostitive automatic spraying system, in the actual process of production, we have to constantly explore the construction characteristics of various colors, for different coatings, need to choose the appropriate automatic sprayer parameters (paint volume, molded air pressure, voltage value), adjustment amplitude of the impact on the appearance of the actual production to explore, which is important for site construction adjustment. Of course, to get a uniform coating film, only through the adjustment of these three parameters is not enough. The purpose can also be achieved by the switch of the main needle of the screw cup in different positions and the speed of the

. In addition, the imitation design parameters can also be appropriately used to adjust, such as the imitation route of the automatic sprayer, according to different positions to adjust the different spray distance (generally in 27±1cm gun distance), the upper and lower left and right swing, the pitch of the rotary cup, the angle of the spraying of the screw cup and other parameters, so as to obtain the best spraying imitation route. The selection and optimization of equipment operating parameters is also very important, the setting of high-voltage electrostitive value, speed, pressure of forming air, viscosity of the coating, etc. must be repeatedly adjusted in the production site until the best range, in order to minimize the orange peel.
1, the speed of the screw cup is the biggest factor affecting the atomization particle size. Poor coating atomization when the speed is too low, will lead to rough paint film, the greater the speed, the smaller the atomization particle size of the paint, the smoother the paint film, but too fine atomization will lead to the loss of paint fog, and will cause excessive wear of flat bearings. For solvent-based coatings, the medium and color paint ESTA speed should be controlled to 20000 to 30000r/min, varnish speed of 25000 to 35000r/min.
2. The amount of forming air can control the paint fan, the lower the amount of forming air, the larger the spray fan. The appropriate amount to reduce the amount of forming air, can reduce the long wave of paint film, but the amount of forming air is too low, will cause rotary cup pollution.
3. The spray distance between the spray cup and the body should generally be controlled at 250 to 300 mm, if the distance is too large, which will not only affect the utilization rate of the coating, but also adversely affect the smoothness of the coating.
4. Spray flow is an important factor affecting the thickness of the paint film, so that the medium coating and varnish film thickness to the maximum, can improve the fullness of the coating, effectively reduce the coating orange peel. In fact, when the spray amount reaches the critical state of flow hanging, the surface effect of the coating is best. At present, the vast majority of domestic automotive factory paint room only heating no drop, the temperature of the paint room is generally controlled at 18 degrees C to 36 degrees C, in the production process can be based on the temperature of the painting room to determine several sets of different spray parameters, to ensure that the amount of spray always reached a non-flow-like state.
5. Spraying electrostic voltage also has an effect on the coated orange peel. Generally controlled at 30,000 volts to 100,000 volts.