Abstract: A belt cleaning device for a coal loading and unloading belt conveyor, including a split-type spraying pipe, a first alloy scraper, and a second alloy scraper. The first alloy scraper is provided on the belt, the belt is supported by a roller. The second alloy scraper is elastically pushed against an underside of the belt and suspended below the roller. A material scraping area is covered by the split-type spraying pipe, the split-type spraying pipe is configured to spray water onto the material scraping area. The belt cleaning device can independently control the inclination angle of the first alloy scraper and the second alloy scraper and uniformly control the adhesion force between the alloy scrapers and the belt, thus solving the problem of scraping off adhesive materials at different wear rates of the belt, improving the efficiency of the coal loading and unloading belt conveyor, and reducing maintenance needs.

Abstract: Described herein is an electric injection annealing test device for crystalline silicon photovoltaic solar cells, the test device comprises a dark box, a sample test bench, a temperature control device, a power supply device and an image acquisition device. The sample test bench, the temperature control device, the power supply device and the image acquisition device are located in the dark box; the sample test bench is used to place a solar cell sheet; the temperature control device is used to control a temperature of the solar cell sheet; the power supply device provides a current to the solar cell sheet, the image acquisition device is used to acquire electroluminescence images of the solar cell sheet under different temperatures and current conditions.

Abstract: The present invention discloses an electric injection annealing test device for crystalline silicon photovoltaic solar cells, the test device comprises a dark box, a sample test bench, a temperature control device, a power supply device and an image acquisition device. The sample test bench, the temperature control device, the power supply device and the image acquisition device are located in the dark box; the sample test bench is used to place a solar cell sheet; the temperature control device is used to control a temperature of the solar cell sheet; the power supply device provides a current to the solar cell sheet, the image acquisition device is used to acquire electroluminescence images of the solar cell sheet under different temperatures and current conditions. The device can provide stable temperature and current, and obtain electroluminescence images of solar cell sheet under different temperature and current conditions.