Connection tube, also known as the cover, the cover is connected, 40 -type connecting tube for SGB620 / 40T , SGB420 / 40TX type scraper head portion for covering the connecting portion to protect the motor, reducer, 40 , small 40 The scraper is generally connected by a coupler, and it is also directly connected by a pair of wheels. One of these two connection methods is called a soft connection, and the other is called a hard connection. There is a window that can be opened in the middle of the connection cylinder, which is convenient to replace the cone pin Wheel pin) and reducer, motor wheel. The connecting cylinder is a commonly used scraper accessory in scraper conveyors.