（1） Treatment of small mixer drum stop running
Check the supporting wheel and motor of the mixing drum to see if there is any debris stuck. If so, clean up the debris. If it is not due to debris stuck, call the rescue vehicle immediately. Under the condition that concrete can be discharged, the pipe joint of the high-pressure hose on the motor can be removed, and the mixing drum can be rotated to let the access hole of the mixing cylinder go down to discharge the concrete from the manhole. After the rescue vehicle arrives at the scene, remove the high-pressure hose from the motor of the fault vehicle, connect the high-pressure hose for rescue, and connect the other end to the oil pump of the rescue vehicle. At the same time, connect the emergency oil return pipe to the oil drain port of the motor of the failure vehicle, and connect the other end to the oil return port of the oil pump of the rescue vehicle. The small-scale mixer truck of the failure vehicle is controlled to rotate until the concrete is discharged. If conditions permit, the motor that fails can be replaced directly. After the motor is replaced, each oil pipe is connected, and the mixing drum can rotate normally.
（2） Structure and working principle of mixing drum of small mixer truck
Most of the mixing cylinders of small-sized mixer truck are pear shaped. The mixing drum is inclined on the frame through the supporting device and can rotate around its axis. There is only one opening on the upper rear of the mixing drum, which is loaded or unloaded through the feeding and discharging device respectively. The shell of the mixing drum is a variable cross-section and unsymmetrical double cone, the shape is pear shaped, the bottom cone is short, the end face is closed and welded with flange, and the reducer is connected with bolts through the connecting flange.
The transition part of the upper cone has a circular raceway, which is welded on the plane circumference perpendicular to the axis of the mixing drum. The whole mixing drum is inclined to lie on the three-point support structure composed of the reducer shell fixed on the frame and a pair of supporting rollers through the connecting flange and the annular raceway, and the reducer drives the smooth rotation around its axis. A steel band is usually set on the upper part of the circumference of the mixing drum raceway to limit the upward jump of the mixing drum when the small mixer truck is running in a bumpy wave.
The internal structure of small mixer drum is different from that of double cone mixer and pear shaped mixer. It is designed to meet the process requirements of unloading and feeding mixing without overturning at a single drum mouth. Two continuous ribbon spiral blades are symmetrically welded along the inner wall from the barrel mouth to the bottom of the mixing drum. When the mixing drum rotates, the two blades are driven to move around the axis of the mixing drum, which is the fundamental device for mixing or discharging concrete. In addition, in order to enhance the mixing effect, an auxiliary mixing blade is installed between the two spiral blades in the middle and lower part of the mixing cylinder.
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