There are three guide rollers in total; two guide rollers are installed on the box body, and the other guide roller is installed on the cover plate. Under the adjustment of the spring and screw mechanism, the cover plate rotates around the mandrel, thus changing the upper guide roller and the lower two guide rollers. Only the relative distance of the guide rollers. The cross-section of the two lower guide roller rings is convex, while the cross-section of the upper guide roller ring is concave. Guide roller bearings are lubricated with oil, gas or grease. There are cooling water holes on the box, spraying water to cool the guide rollers.
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