The concrete mixer equipment will have some faults in long-term operation, and the stuffy machine is one of the common faults. How to deal with the stuffy machine fault of the concrete mixer.

1、故障现象：在投料搅拌过程中，搅拌主机因电流过大出现闷机跳闸。

1. Fault phenomenon: during feeding and mixing, the mixing machine trips due to excessive current.

原因分析：1.投料过多，引起搅拌机负荷过大。搅拌叶片与衬板之间的间隙过大，搅拌过程中，增大了阻力。

Cause analysis: 1. Excessive feeding causes excessive load of mixer. The gap between the mixing blade and the lining plate is too large, which increases the resistance during the mixing process.

处理过程：1.检查配料系统是否超标和是否有二次投料现象。检查搅拌机叶片与衬板之间的间隙是否在3-8mm之间。

Treatment process: 1. Check whether the batching system exceeds the standard and whether there is secondary feeding. Check whether the gap between the mixer blade and the lining plate is between 3-8mm.

2、故障现象：搅拌机在搅拌生产时，待料斗内料未投入搅拌机皮带又运上一盘料，致待料斗内料满出并废料。

2. Fault phenomenon: when the mixer is mixing production, when the materials in the hopper are not put into the mixer belt, another plate of materials is transported, resulting in the full discharge of materials in the hopper and waste.

原因分析：骨料卸料需要程序检测到待料斗内料已经放到搅拌机内，但程序检测的是与待料斗门到位开关有关的量，如果此开关误动作，则有可能引起二次进料。

Cause analysis: for aggregate unloading, the program needs to detect that the material in the waiting hopper has been put into the mixer, but the program detects the amount related to the position switch of the waiting hopper door. If this switch misoperates, it may cause secondary feeding.

处理过程：加强待料斗门到位开关信号可靠性，在开门与关门到位的位置各并排装两到三个磁性检测开关一般能此类故障；如果生产时突然出现故障，检查此位置检测开关是否移位或损坏失效，特别注意：温度过高可引起磁性开关失效。

Processing process: strengthen the reliability of the switch signal of the hopper door in place, and install two or three magnetic detection switches side by side at the position where the door is opened and closed in place, which can generally eliminate such faults; If a fault occurs suddenly during production, first check whether the position detection switch is displaced or damaged. Special attention: too high temperature can cause the magnetic switch to fail.