Reason:
1.The mixing blades are worn out too much the distance between the blades and the scaleboard is too much, the stones block overmuch;
2. The resistance of the mixing axle-ends supporting device is too much; 
3. The voltage is too low.
Measure:
1.Replace some new mixing blades, adjust the distance between the blade sand scaleboard.
2.Infuse lubricating oil to the mixing support device.
3.Adjust the voltage.

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