Spraying robots are industrial robots that can be painted or sprayed with other paints. They are mainly composed of a robot body, a computer and a corresponding control system. The hydraulic-driven sprayer also includes hydraulic sources such as pumps, fuel tanks and motors. More use of 5 or 6 degrees of freedom articular structure, the arm has a larger movement space, and can do complex trajectory movement, the wrist generally have 2 to 3 degrees of freedom, can be flexible movement. So what are the terms of the spray robot? Does it understand the key parameters?
 
First, the main terminology of spraying robots
1, spraying robot painting efficiency, painting efficiency and coating efficiency
Painting efficiency is the efficiency of spraying operations, including the unit area of ​​the spray area, paint and spray the effective use of the area. The efficiency of the coating is the ratio of the amount of coating applied to the coated material to the total amount of the actually sprayed paint during the spraying process or the ratio of the measured thick film on the coated surface to the thickness of the coating film calculated from the amount of sprayed paint , That is, the transfer efficiency of paint (Transferefficency referred to as TE) or paint utilization.
 
Coating efficiency refers to the actual coating of the surface area of ​​the coating with the gun to run the coverage area ratio; in order to be coated part of the coating area of ​​the coating integrity, the general operation of the spray gun coverage area should be greater than the area of ​​the coating.
 
2, spray the robot spray trajectory
Spraying Robot Spraying tracks refer to the order and stroke of the gun run during the spraying process, and the spray robot can be used to simulate the spray trajectory of a skilled sprayer.
 
3, spray the robot's paint flow rate
Spraying the robot coating flow rate is the amount of paint per unit time lost to each spin cup, also known as spray flow, the amount of paint (rate). In addition to rotating cup speed, the coating flow rate is the second factor affecting the fineness of atomized particles. When the other parameters of the same circumstances, the lower the flow rate of paint, the more fine atomized particles, but also lead to paint mist in the solvent evaporation increased.
 
Spray coating robot coating rate will form a corrugated coating, and when the paint flow is too large to spin cup overload, the edge of the spiral cup coating thickened to a certain extent, resulting in the rotation of the groove on the groove can not make the paint shunt, And the emergence of layered patent leather, which will produce bubbles or paint droplets uneven size of the phenomenon.
The maximum coating flow rate of each spray gun is related to the diameter of the high-speed rotary cup and the density of the speed coating. The upper limit is determined by the fineness of the atomization and the effect of the electrostatic coating. Practical experience shows that the paint should be entered at a constant speed, fluctuations in a small range will not affect the quality of the coating.
Spraying robots in the actual spraying process each spin cup is sprayed different areas, the flow rate of the coating is not the same, and because of the changes in the shape of the reasons for the coating, spin cup coating flow rate also changes. To spray the car body, for example, when spraying a large area, such as spraying a large amount of paint, spray the door column, the window column, the amount of paint spit out the small, and in the spraying process automatically and accurately control the spit out the paint In order to ensure the quality of coating and film thickness uniformity, which is to improve the utilization of paint one of the important measures.
 
4, spray the robot rotation cup speed
Spinning robot Rotating cup speed is the most influential factor in the aerosol fineness of high rotational speed cups. When the other process parameters unchanged, the greater the rotation speed of the spin, the smaller the diameter of the paint droplets. In the slightly lower speed range, the effect of the speed on the fog fineness is significantly higher than in the high speed range.
Spraying the robot rotation cup will have an effect on the film thickness. When the speed is too low will lead to rough coating; spray the robot and the atomization will lead to excessive paint mist loss (caused by over-spray), so that the thickness of the film fluctuations; colleagues when the atomization of ultra-fine, sensitive. Rotating cups in addition to excessive rotation caused by over-spray, but also lead to excessive wear and tear of the turbine bearings, increase the consumption of compressed air and reduce the amount of solvent contained in the coating. The optimum rotational speed of the sprayed robot can be determined according to the flow rate characteristics of the coating used. Therefore, for the water-borne coating with surface tension, the rotational speed of the two-component coating with high viscosity is higher than that of the ordinary solvent-based coating.
Spraying robots Under normal circumstances, no-load rotary cup speed of 6X10 ^ 4r / min, the load set the speed range (1.0 ~ 4.2) X10 ^ 4r / min error ± 500r / min.
 
Second, spray the main spray parameters of the robot
 
Electrostatic spraying technology has become the mainstream of today's automobile industry spraying technology, and the application of static automatic spraying equipment to make the car, the surface coating into the automation era. The following is a brief description of the main spray parameters of the sprayed robot.

1, spray flow
The flow rate of the electrostatic spraying robot is the amount of paint lost per unit time to the rotating cup, also known as the discharge volume. The size of the flow affects the thickness of the film. Different colors of paint coating capacity is different, the construction film thickness is also different. During the spraying process, each robot has a different spray area, and the flow rate is different. At the same time the flow is also related to the shape of the sprayed material, for the car, the rules of the five-door cover a general flow larger, and the column, ridge, corner flow smaller.
 
2, forming air
The gas is sprayed from the evenly distributed holes in the rear side of the swivel cup to limit the amplitude of the mist (fan) and push the atomized paint mist toward the object, place the paint mist to diffuse and react with the rotating cup and Atomizer. For metal lacquers, spray the effect of the final color effect, spray is not appropriate prone to zebra or flower. Spray the setting and the distance between the two guns, the number of times the paint is stacked three times. Such as the distance between the two guns 100mm, spray the best control of 300mm, so that the same point of paint can be superimposed 3 times.
 
3, rotating cup speed
Rotating cup speed is the key parameter of the paint atomization, spinning cup high-speed rotation of the centrifugal force generated when the paint atomization is very fine (50-100μm). The smaller the diameter of the paint droplets, the better the smoothness of the paint film, the smaller the orange peel effect, the higher the gloss. The speed setting is also related to the type of paint, paint the speed is relatively small, the coating, varnish speed is relatively higher. Speed ​​and flow are also related to the flow, the speed should be increased in order to achieve better atomization effect, but the speed is too high, sprayed on the paint to be painted on the more dry, will lead to orange peel problem.
 
4, high pressure
In the electrostatic spraying, the coating is positive, the rotating cup is the negative electrode, and the high voltage is applied between the poles to produce strong electric attraction force, so that the atomized mist particles are transported to the surface of the coated material. The size of the high voltage affects the electrostatic effect of electrostatic spraying, painting rate, film uniformity.
Flow, speed, forming air and high pressure directly affect the film quality, but also affect the utilization of paint. In the production to be combined with the characteristics of paint and atomizer parameters, to adjust, Sihe parameters to be considered, and constantly optimize in order to achieve the desired spraying effect.