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 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 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.