When the concrete mixer equipment appears the fault phenomenon of slow powder feeding: screw conveyor feeding is very slow, the feeding time is more than 2 minutes, under the normal feeding condition, the conveying can be completed within 20 seconds.

　　而造成这种故障出现的原因经过分析：

　　The causes of this kind of failure are analyzed
              
       影响因素主要是粉料罐下料不畅和螺旋输送机损坏等。粉料下料不畅的表现形式有粉料起拱、粉料罐口出料口处物料结块、出料蝶阀开度过小、粉料罐内物料不足等。螺旋输送机损坏主要是螺旋叶片变形，不能正常输送。

　　The main influencing factors are the poor discharge of powder tank and the damage of screw conveyor. The performance forms of powder material discharging are arched powder, material caking at the outlet of powder tank mouth, too small opening of discharge butterfly valve, insufficient material in powder material tank, etc. The damage of screw conveyor is mainly due to the deformation of screw blades, which can not be transported normally.

　　处理过程：

　　Treatment process:

　　1.开启气锤破拱装置。

　　1. Open the air hammer arch breaking device.

　　2.检查粉料罐卸料蝶阀的开度，并使蝶阀处于全开的位置。

　　2. Check the opening of discharge butterfly valve of powder tank and make the butterfly valve in full open position.

　　3.检查粉料罐出口处物料是否结块。

　　3. Check whether the materials at the outlet of powder tank are caking.

　　4.检查螺旋机叶片是否变形，如变形则拆除校正或更换。

　　4. Check whether the blade of screw machine is deformed. If it is deformed, remove it for correction or replace it.