The cutting ring and spectacle plate are a pair of closely matched parts with relative motion. The contact surface of both parts is welded with a layer of wear-resistant material. Through the special-shaped nut at the end of the S-shaped key shaft, the concrete pump can adjust the gap between them within (0.1-0.2) mm. The rubber spring assembled between the S-shaped tube and the cutting ring enables the cutting ring and the spectacle plate to move freely relative to each other.

随着使用时间的延长，橡胶弹簧失去弹性，切割环和眼镜板的接合面将出现磨损，从而导致二者之间间隙增大。当间隙>0.7mm时，需立即调整，否则混凝土泵送的砂浆会乘“隙”而入。一旦有砂浆进入摩擦面，切割环和眼镜板的磨损速度将大大加快。

With the extension of the use time, the rubber spring loses its elasticity, and the joint surface of the cutting ring and the spectacle plate will be worn, resulting in the increase of the gap between the two. When the gap is more than 0.7mm, it needs to be adjusted immediately, otherwise the mortar pumped by concrete will enter by "gap". Once the mortar enters the friction surface, the wear rate of the cutting ring and the spectacle plate will be greatly accelerated.

泵送混凝土时，切割环随着S形管的摆动而摆动，起着切割混凝土的作用，因此切割环磨损的速度比较快，出口处混凝土的压力越高，切割环的磨损程度就越严重。通常情况下，切割环的磨损发生在边缘，且处于上部成90°角的两个对称部位。因此，当切割环的上述部位磨损时，可及时将切割环旋转一个角度后继续使用，这就相当于将切割环的使用寿命延长一倍。

When pumping concrete, the cutting ring swings with the swing of S-shaped pipe, which plays the role of cutting concrete. Therefore, the speed of cutting ring wear is relatively fast. The higher the pressure of concrete at the outlet, the more serious the wear degree of cutting ring. Generally, the wear of cutting ring first occurs at the edge, and it is in two symmetrical parts with 90 ° angle at the upper part. Therefore, when the above parts of the cutting ring are worn, the cutting ring can be rotated for an angle in time and then used again, which is equivalent to extending the service life of the cutting ring by one time.

眼镜板的磨损发生于其中部鼻梁处，混凝土输送泵眼镜板和切割环之间的间隙越大，其磨损速度越快。因此必须时刻注意眼镜板和切割环之间的间隙，一旦发现间隙增大，需立即拧紧异型螺母或更换磨损件，防止砂浆进入摩擦面。当橡胶弹簧失去弹性时，需立即更换。对于可以修复的切割环和眼镜板，可用D507焊条补焊后继续使用。

The wear of the spectacle plate first occurs in the middle of the nose beam. The larger the gap between the spectacle plate and the cutting ring of the concrete delivery pump, the faster the wear rate. Therefore, it is necessary to pay attention to the gap between the spectacle plate and the cutting ring at all times. Once the gap is increased, it is necessary to tighten the special nut or replace the wearing part to prevent the mortar from entering the friction surface. When the rubber spring loses its elasticity, it needs to be replaced immediately. For the cutting ring and spectacle plate that can be repaired, d507 electrode can be used after repair welding.