Abstract: When the environmental sweeper is used in the north, the secondary dusting phenomenon is serious. Nowadays, water spray dust reduction technology is used to deal with this problem. Due to the different amount of dust on different road sections, there is the problem that watering is less and the dust is serious, and watering mud is sticky and difficult to clean. Aiming at the secondary dust problem of the wet sweeper, a dust sensor and a single-chip microcomputer are proposed to solve the secondary dust control strategy of the sweeper. The program uses two dust sensors to detect the dust content around the sweeper and the blower outlet. The nozzle design adopts a three-level subdivision water spray system. The entire system is controlled by the single-chip microcomputer and an intelligent control scheme for the water spray system of the sanitation sweeper vehicle is realized. design. This program is not only simple and feasible, but also easy to install. It has a certain practical value.
Keywords: Road sweeper; Secondary dust; Dust sensor; Sprinkler system

0 Introduction With the acceleration of the process of urbanization and the completion of the highway network with the “Five Verticals and Seven Horizontals” as the main skeleton, the area of ​​sweeping and cleaning of urban roads and highways continues to expand, and the task of sweeping and cleaning is becoming more and more onerous. Mechanized cleaning is an inevitable trend to replace traditional manual cleaning. Therefore, sanitation sweepers have a good market prospect. Sanitation sweeper vehicles are sanitation machines used to remove, collect, and transport dirt such as road waste. Currently, many sweeping vehicles on the market have problems such as low cleaning rate, short working hours and serious secondary dust pollution. To completely solve these interrelated problems, it is necessary to adjust the relationship between the ground pressure of the sweeper, the working speed, and the flow rate of the water spray and other corresponding measures in accordance with the type of ground waste and dust concentration, but this is obviously more difficult. Even though the sweeping sweeping vehicles on the market currently have a large amount of dust, most of the secondary dust is still severe, and it is difficult to fundamentally eliminate them. This is especially true in areas with large wind and sand in the north. For the current gap in secondary dust eradication technology in the domestic market, it is very urgent to carry out this key technology research.

1 Road sweeper classification and existing problems
1.1 Classification
1.1.1 According to the principle of operation (1) Pure sweeping sweeper. The sweeper is not equipped with a fan on the sweeper. The sweeper sweeps the roadside sweeper to the sweeper by side sweeping, and sweeps the trash into the trash can by sweeping or sweeping + throwing. As early as the early 1980s, China developed a pure sweeper vehicle and used it in the sanitation department of some big cities. Later, with the development and development of the sweeper sweeper, the sweeper was gradually It was replaced by a suction sweeper. Pure sweeping sweepers only sweep (throw) the waste into the waste bin through mechanical sweeping, so no wet dusting or dry dusting is required. In order to prevent the road sweeper from dusting during sweeping operations, spray sweepers are generally installed at the sweeping positions of the sweeper sweeper.
(2) Suction Sweeper. The suction sweeper is the most widely used and most widely used sweeper in the world. The suction sweeper is not only dry and wet, but also has a variety of structural types. Since the end of the 1980s, the Changsha Institute of Construction Machinery of the Ministry of Construction has developed China's first suction sweeper. The sweeper sweeper has developed rapidly in China. At present, most of the road sweepers produced and used in China belong to the suction sweeper. The suction sweeper is not only equipped with a sweeping sweeper to increase sweeping width, but also has a fan. The sweeping device sweeps the trash on the side of the road to the suction nozzle, and then the fan sucks the garbage under the suction nozzle into the dust box through the air duct.
1.1.2 According to dust removal mode (1) Dry sweeper. The dry sweeper adopts the dry dust removal method, that is, the sweeper does not spray water during the dust removal process during the sweeping operation. Therefore, the dry sweeper must be provided with a filter in the dustbin or the air duct. When a dry sweeper sweeps, a large amount of garbage inhaled from the mouthpiece enters the waste bin, and the natural sedimentation occurs due to a drastic decrease in the wind speed in the waste box, and the inhaled light-weight fine dust passes through the air flow. The filter is trapped by the filter. Depending on the type of filter used in the sweeper, some dry sweepers can use water jet dust to counter sweep, while some dry sweepers cannot use water jet dust to prevent the filter from plugging. Because the dry sweeper truck does not use water during dust removal, there is no phenomenon that the sweeping water is frozen because the ambient temperature is too low. Therefore, the dry sweeper truck is particularly suitable for use in water-scarce areas or areas with long cold periods.
(2) Wet sweeper vehicles. The wet sweeper adopts the wet dust removal method, that is, the sweeper adopts water jet dust removal at the suction nozzle and the suction pipe, except that the dust is sprayed at the sweeping position during the sweeping operation. The purpose of spraying the dust at the sweeping point is to make the sweeper not dust when the sweeping operation is performed. The dust is sprayed at the suction nozzle and the suction pipe to make the fine dust sucked through the suction nozzle wet in the water mist. Agglomeration into larger volumes of particles for settling in the bin. Since dust collected by the wet sweeper coalesces after being agglomerated by water jets and can be naturally settled in the waste bin without using other measures, its air duct structure is relatively simple and no dust filter is required.