The washing machine is mainly used to clean solder, dust, and other impurities on PCB boards. During the soldering process, residual solder and other contaminants may remain on the PCB board. If not cleaned in a timely manner, it may affect the performance and reliability of the circuit board.

　　The working principle of a washing machine is usually to use cleaning solution to rinse the PCB board. The cleaning solution can be organic solvents, water, or other special cleaning agents. The washing machine applies cleaning solution to the PCB board through spraying, soaking, or ultrasonic waves to remove contaminants.

　　The washing machine has the characteristics of high efficiency and environmental protection. It can quickly clean a large number of PCB boards and improve production efficiency. At the same time, some washing machines use environmentally friendly cleaning solutions to reduce pollution to the environment.

　　When choosing a washing machine, factors such as PCB board size, cleaning requirements, and production scale need to be considered. Different types of washing machines are suitable for different production needs. For example, small washing machines are suitable for small-scale production, while large washing machines are suitable for large-scale production.

　　The maintenance of the washing machine is also important. Regularly replacing cleaning solution, cleaning nozzles and filters can ensure the cleaning effect and performance of the washing machine.