The measurement error of automatic concrete mixer truck is usually manifested in the instability, drift, linear out of tolerance and other fault problems of each batching scale during use. There are control software factors and equipment hardware factors, so it needs to be determined according to the site conditions.

(1)配料机进行配料时，当物料已经快要达到称料斗预先的设定值，给料皮带机就会自动停止，但此时仍然有部分的物料会从空中落入称料斗，该部分物料的重量即为落差。为保证配料的精度，通常会对物料设定落差值并加以修正。但如果骨料或干或湿，其实际的落差往往与设定值之间存在差异，因此还需要设置风雨棚和排水功能，以防止物料受潮或日晒。

(1) When the batching machine is batching, when the materials are about to reach the preset value of the weighing hopper, the feeding belt conveyor will automatically stop, but at this time, some materials will still fall into the weighing hopper from the air, and the weight of this part of materials is the drop. In order to ensure the accuracy of batching, the drop value of materials is usually set and corrected. However, if the aggregate is dry or wet, there is often a difference between the actual drop and the set value. Therefore, it is also necessary to set up a canopy and drainage function to prevent the materials from moisture or sunlight.

(2)在称料斗卸料的过程中，档期重量达到初设值时，就会停止卸料。如果出现湿料粘附于称料斗上的情况，将导致无法完全卸料。因此，生产中需要由人工操作，以抵消粘附物的重量，或者在称料斗上加装振动器，以减小误差。

(2) During the unloading of the weighing hopper, the unloading will be stopped when the schedule weight reaches the initial setting value. If wet material adheres to the weighing hopper, it will not be able to discharge completely. Therefore, manual operation is needed in production to offset the weight of adherents, or a vibrator is installed on the weighing hopper to reduce the error.

(3)如果日常使用中，忽视对于配料机械的维修保养，很可能会导致料门开启机构、卸料气缸出现滞涩的情况，可能直接导致料门启闭迟滞，从而影响计量准确。此外，水泥秤本身为密封空间，如果不注意清扫排气管，同样会因为堵塞导致秤里气体无法排出(见下图)，从而产生压力，作用于传感器上，就会使秤产生虚值，从而造成误差。

(3) If the maintenance of batching machinery is neglected in daily use, it is likely to cause stagnation in the material door opening mechanism and unloading cylinder, which may directly lead to the delay in the opening and closing of the material door, thus affecting the accuracy of measurement. In addition, the cement scale itself is a sealed space. If you do not pay attention to cleaning the exhaust pipe, the gas in the scale will not be discharged due to blockage (see the figure below), resulting in pressure. If it acts on the sensor, the scale will produce virtual value, resulting in error.

(4)安装过程，应当注意传感器的安装位置和方向，以及称重部位连接方式，如果安装位置不当，或使用了硬连接，也会导致计量不准。把秤斗焊接处割开后，计量恢复正常。

(4) During installation, pay attention to the installation position and direction of the sensor and the connection mode of the weighing part. If the installation position is improper or hard connection is used, it will also lead to inaccurate measurement. After the welding part of the scale bucket is cut off, the measurement returns to normal.