2, check whether there is debris in the hose, see whether it is smooth.
3, check whether the reset spring of the dispensing valve is stuck.
4, check whether the signal to control the glue valve is issued.
5, check the glue valve outlet is blocked.
6, check whether the air source connected to the glue valve is normal.
7, check the use of silica gel time, the use of a longer period of time, will lead to silica gel encapsulation in the curing phenomenon, resulting in silica gel valve clogging not glue.
8, check the automatic dispensing machine used on the dispensing needle size is small, resulting in glue can not flow out on time, will also lead to glue valve blockage.