裝載機在裝卸物料時，往往因物料黏附在鏟斗內底板上很難傾卸干凈，甚至會越黏越多。當山東裝載機作業量大時，若不將黏附的物料磕掉，將減少鏟斗裝卸總量，增加功率消耗和使用成本，影響用戶經濟效益。為了將黏附的物料磕掉，操作者需要操縱手柄讓轉斗缸快速動作(即快速翻轉鏟斗)，使鏟斗后底部的限位塊快速撞擊動臂縱梁，用此時產生的強烈振動振掉鏟斗內底板上黏附的物料，這一操作過程被稱為“磕斗”。
Shandong loader in materials handling, often due to material adhesion in the bucket bottom is difficult to unload clean, even the more viscous more. When the Shandong loader of the large amount of work, if we do not adhesion material knock off, will reduce the total bucket loading and unloading and increase in power consumption and use cost, affecting the user economic benefits. In order to adhesion material knock off, the operator needs to handle to turn the bucket cylinder, quick action (i.e., Fast Flip Bucket), make bucket bottom limit block a quick hit boom stringer, point to produce strong vibration off within the bucket bottom adhesion material, the operation of the process called "bucket" knock.

若裝載機磕斗時用力過大、振動過強，不僅會使裝載機的相關零部件早期損壞，還會造成操作者不適；若用力過小、振動過弱，黏附在鏟斗內底板上的物料不容易被振掉，會影響裝載機的工作效率，對磕斗應以達到清除黏附在鏟斗內底板上的物料所需力度為標準，防止磕斗時用力過大或過小。
If Shandong loader knock bucket with excessive force, vibration is too strong, it will not only enable loader components related to early damage, can also cause operator discomfort; if the force is too small, vibration is too weak,adhesion in the bucket bottom material is not easy to be a strikeout, effects of loading machine industry and trade efficiency, to knock a bucket should be to achieve the removal of adhesion in the bucket bottom material required effort as the standard, to prevent knock when the fighting force is too large or too small.