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 during loading and unloading of materials, often due to the adhesion of materials dumped in a bucket on the floor difficult to clean, and even more will be more sticky. When the job is large, if the adhesion of the material Kediao, will reduce the total amount of the bucket handling, increased power consumption and cost, the impact of user cost. To adhesion material Kediao, the operator needs to make the bucket cylinder control handle fast action (ie fast flip bucket), so the stopper quickly hit bottom after bucket boom stringers, with strong vibration generated at this time vibration out on the floor inside the bucket adhesion material, this operation is called "knock bucket."

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 excessive force when Shandong loader bucket knock, vibration is too strong, not only will the loader early damage related parts, the operator can also cause discomfort; if the force is too small, too weak vibration, adhesion in the bucket on the floor the material is not likely to be the vibration off, it will affect the efficiency of the loader. to knock the bucket should be to achieve a clear adhesion in the bucket on the floor of the materials required for the intensity of the standard, to prevent knock fighting force too large or too small.