How to divide the front and back of the filter screen of sweeping robot

There is a button at the front, but not at the back. The filter screen of sweeping robot is mainly HEPA filter, which means high efficiency air filter in Chinese. It is used to filter out the dust inhaled into the sweeper and bring it into the air again to cause secondary air pollution. The filter screen of the sweeping robot is divided into two parts, with buckles on the front and no buckles on the back. A sweeper is a sweeping robot. In the near future, like white goods, it will become an indispensable cleaning helper for every family.