1, the difference between the concrete pumped at each site. In general, when the concrete ratio is reasonable (commercial concrete), the service life of the glasses plate and the cutting ring is longer.

2. Differences in pumping conditions at each site. When the concrete is pumped at a large height and a long distance, the glasses plate and the cutting ring have a shorter life because of the greater back pressure.

Third, the gap between the glasses plate and the cutting ring will also affect the service life. The cutting ring has a large preload, so it can be pressed firmly on the glasses plate. When pumped, the mortar will not be able to enter. At this time, the wear of the glasses plate occurs on the whole flat, and the wear is more uniform, so its life is longer. The wear of the cutting ring occurs on the edge of the cutting ring, if we can adjust the direction of the cutting ring in time, so that the edge wear is uniform, then the life of the cutting ring will be doubled. When there is a large gap between the glasses plate and the cutting ring or when the rubber spring is aging, the mortar and small aggregate will easily enter the glasses plate and the cutting ring under the action of back pressure. Since each working cycle will be cut twice with the cutting ring, the nose of the glasses plate is the easiest place to enter the small aggregate, which is easy to cause the nose of the glasses plate to wear out and scrap.

Therefore, after working for a period of time, the concrete pump truck should train the direction of the cutting ring and tighten the special-shaped nut, which will greatly extend the service life of the glasses plate and the cutting ring.