The conveyor generally has 10 open sunroof slots, and one open sunroof slot is installed every 9 middle slots. When the bottom chain fails, you can open the sunroof, check the bottom conveyor chain, and replace the scrapers, bolts and ring chains. 
The middle slot of the sunroof can be divided into: the middle slot of the sunroof in Shandong, the middle slot of the northwest Benniu, the middle slot of the Shanxi Coal Machinery Factory, and the middle slot of Zhengmei. 
According to the scraper conveyor model, it can be divided into: 630, 730, 764, 800, 830, 880, 900, 1000, 1200, 1250, 1350, 1400 and other models