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      Our country has been using the three-arc straight-line tooth profile of the former Soviet Union and Europe, although the transmission performance is good, but the design and manufacture are relatively complex. The involute tooth shape of 30 degree pressure angle is called HV chain drive, which has good high-speed transmission performance. Another notable feature is the application of CAD/CAM technology, which directly promotes the development of sprocket technology. Sprocket drawing software has entered the market. With these software, sprocket working drawing can be quickly drawn by inputting relevant parameters, such as the size of the matching chain, sprocket structure, number of teeth, etc.
Chain and synchronous belt pulley products are the main basic transmission components. Their transmission characteristics are long-distance transmission without affecting speed ratio (in contrast, gears are short-distance transmission, and teeth and teeth cross-drive, speed ratio is equal). Synchronized pulley sprocket products have become an indispensable important mechanical basic transmission products in the national economy. There are two kinds of driving devices for slurry valves: manual operation and electro-hydraulic operation. And widely used in mining machinery, agricultural machinery, construction machinery, forestry machinery, petrochemical industry, automatic assembly line and other transmission machinery, visible chain, synchronous pulley products are widely used.
With the acceleration of marketization and internationalization of chain and synchronous pulley products, the classification of sprocket is gradually standardized. From the categorization of chain and synchronous pulley products, in recent years, the system of laundry franchise has become more and more perfect, and the service of these franchises is getting better and better. Mainly divided into A series (American Standard) and B series (European Standard) two categories. Series A is the size and specifications conforming to American and Japanese standards. The products are mainly used in the American and Asian markets. Series B is the size specifications conforming to European chain standards and mainly applicable to European markets. Series A and B can be divided into three types: sheet type, single side belt convex type and double side belt convex type. The sheet type is A, the single side belt convex table type is B, and the two side belt convex table type is C. According to the different types of chains, A, B and C can be divided into single row, double row, three row, four row and so on. According to the different types of chains, they can also be divided into short pitch precision roller sprocket, long pitch precision roller sprocket, conveying sprocket and so on.