装载机在装卸物料时，往往因物料黏附在铲斗内底板上很难倾卸干净，甚至会越黏越多。当山东装载机作业量大时，若不将黏附的物料磕掉，将减少铲斗装卸总量，增加功率消耗和使用成本，影响用户经济效益。为了将黏附的物料磕掉，操作者需要操纵手柄让转斗缸快速动作(即快速翻转铲斗)，使铲斗后底部的限位块快速撞击动臂纵梁，用此时产生的强烈振动振掉铲斗内底板上黏附的物料，这一操作过程被称为“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.

若装载机磕斗时用力过大、振动过强，不仅会使装载机的相关零部件早期损坏，还会造成操作者不适；若用力过小、振动过弱，黏附在铲斗内底板上的物料不容易被振掉，会影响装载机的工作效率，对磕斗应以达到清除黏附在铲斗内底板上的物料所需力度为标准，防止磕斗时用力过大或过小。
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.