The operators of small concrete mixing truck can only operate after professional training. The pumped concrete shall meet the pumpability requirements of concrete pump truck. Concrete pump truck pumping operation key can refer to the use of concrete pump. When the pumping is interrupted for more than 5 minutes, the concrete in the end hose must be discharged. Otherwise, due to the end of the concrete dehydration in the hose, the concrete will be sprayed fiercely and splashed around when pumping again, so the end hose is easy to be damaged. In order to change the orientation of the boom or concrete pump truck and need to fold, expand or recycle the distributing boom, first reverse the pump for 1 ~ 2 times and then act, so that the concrete placed in the conveying pipeline can fall or splash.
There are two methods of pipeline cleaning: water washing and air washing. Whether it is water washing or air washing, the valve box and hopper should be cleaned. When washing with water, put the cylindrical cement bag and cleaning ball soaked with water into the cleaned taper pipe, connect the taper pipe and pipe, close the discharge door, and then fill the hopper with water. Pump water until the cleaning ball comes out from the front of the delivery pipe. Air cleaning, namely compressed air blowing, is to plug the water soaked cleaning ball into the air inlet washing joint first, then connect it to the top straight pipe connected with the reducer, and connect the safety cover at the end of the pipe, with the orifice of the safety cover facing down.
If the power of the pumping solenoid valve is normal, it can show that the driving and pumping direction should be normal, but from the beginning: i2.5 is on, the transfer case direction is on, the proximity switch is on, and the driving and pumping action of the car is normal with the cab operation, which shows that the driving and pumping control circuit has no defects. The engine speed up is normal, the system has no pressure, and the azimuth check has no defects. Therefore, it is concluded that the defect is the internal fork of the transfer case. Observe the pressure gauge of positive and negative pump, the pressure is 0, and there is no pressure in the system. Check dt1 solenoid valve power normal, after the manual top of its spool, shortcomings as usual.
When the whole machine is placed horizontally, the maximum allowable tilt angle is 3O. A larger horizontal tilt angle will overload the steering gear of the cloth and endanger the stability of the machine. Assuming that one or several legs of the boom leave the ground early when it is moving, it is necessary to set the legs from the beginning until all the legs can be reliably supported on the ground. If a section of distributing rod can be in horizontal position after all, it is the most ideal for pumping. Assuming that the position of the boom is horizontal, the movement speed of concrete will slow down, and then the abrasion of the delivery pipe and the end hose can be reduced. When the pumping is interrupted, only the concrete in the end hose will flow out. Assuming that after all a section of distributor is inclined downward, the concrete in some conveying pipes will accelerate under the action of self weight, so that the concrete in the conveying pipe will continue to flow out when the pumping is interrupted.