Generally the workpieces are entered intermittently for electrophoretic coating with the help of monorail electric hoists or other forms of conveyors.
The self-propelled electric hoist is powered by travel motors and lifting motors via sliding contacts mounted on the track to realize movement between processes and lifting and lowering of the spreader. The spreader can be swung and moved vertically into the tank. If required, the spreader can be swung after entering the treatment tank for better drainage. The self-propelled electric hoist system is poorly adapted to the drying chamber and unloads the workpiece onto another conveyor for baking when the coating needs to cure. Self-propelled electric hoists can change direction by means of a small airborne bend in the track, which takes up less space than a pushrod suspension chain. Self-propelled electric hoists can travel at speeds of up to 36m/min, allowing for fast forwarding and deceleration before stopping to minimize crosstalk.
Due to the multiple immersion processes of pre-treatment and electrophoretic coating, self-propelled hoists and programmable crane conveyor systems can move the workpieces vertically in and out of the treatment tanks. When designing, the size of the tank can be slightly larger than the movement space of the workpiece in the tank to reduce the equipment investment and operating costs, and at the same time, reduce the amount of paint and pre-treatment drugs used in the tank. This kind of equipment is suitable for intermittent coating production line, and can be used for coating production with TAKT time greater than or equal to 5min, such as electrophoretic coating process with double workstations, then the production TAKT is accelerated to 4 min.
Every innovation of conveying equipment promotes the progress of coating technology, for example, auto body pretreatment and cathodic electrophoresis coating line. Since the 21st century, in order to improve the quality of the surface electrophoresis coating of automobile body, and 100% of the surface of the body coating perfect, reduce the amount of liquid carried by the body, automobile body electrophoresis coating using the newly developed rotary reverse dip conveyor (i.e., Ro-Dip) or multifunctional shuttle conveyor, as a substitute for the traditional push rod suspension chain and pendulum conveyor. Each step of the innovation process has led to an improvement in the pre-treatment and electrophoretic coating of automotive bodies and to a conceptual solution to the problems that existed in the electrophoretic conveying process.