The glasses plate is a part of the S-shaped pumping distribution valve, which is connected with the concrete conveying cylinder. The moving part S-tube swings from the concrete cylinder port on one side to the concrete cylinder port on the other side under the drive of the swing cylinder. The cutting ring swings with the S-tube against the glasses plate, forming a switching friction pair with the glasses plate. Due to the rapid swing of the cutting ring, the glasses plate and the ready-mixed concrete produce strong wear, and at the same time bear the impact force generated when cutting the stones. It can be seen that the glasses plate mainly works at room temperature and bears impact force, shear force and very strong friction.
Glasses plate is an important part of the concrete pump, its volume is not large, but the technical content and processing costs are very high. At present, the life of the glasses plate is about 30000 m2 of concrete. In order to improve the efficiency of the pump truck, it is very important to take corresponding measures to improve its life.
The main failure mode of spectacle plates is wear, fragmentation and block failure. The wear between the spectacle plate and the cutting ring belongs to abrasive wear, which is firstly manifested as blunt edges and corners of the cutting ring and the spectacle plate orifice, and forms a smaller arc surface wedge. With the increase of the abrasive particle size involved in the wear, the wear gap also increases. When the gap reaches a certain value, the construction will be affected by serious slurry leakage. With the increase of pumping height, the impact shear of the spectacle plate will increase, the wear will be more severe, and it is easy to break and collapse.
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