The concrete mixer has a standing operating system, which controls the loading, unloading, mixing and other functions of the concrete mixer, and realizes the high productivity and quality control ability of the concrete mixer. Changli in this chapter introduces the operating system of the concrete mixer.

自上料水泥搅拌车电气系统包括搅拌电动机，提升用制动电动机，微型水泵电机电动推杆电机五个行程开关和控制箱，控制箱安放在上料架上位于操作。

The electric system of concrete mixer includes five travel switches and control box, which are mixer motor, brake motor for lifting, electric push rod motor for micro water pump. The control box is placed on the feeding rack for operation.

自上料水泥搅拌车控制线电压为380伏，合上控制箱侧面的电源总开关接通外电源控制箱上方的电源指示灯显示，表示整个线路已供电。自上料水泥搅拌车电气控制箱上方还有控制水泵供水量用的时间继电器，拧动指针位置即是时间（秒）与供水量（升）近似线性关系，安装后似调一次即可确定。控制箱有四组共十一个控制按钮，按动这些控制按钮即可控制上料、供水、卸料搅拌系统工作。控制箱装有暗锁，确保安全。

The control line voltage of the concrete mixer is 380V. Turn on the main power switch at the side of the control box and turn on the power indicator above the external power control box to indicate that the whole line has been powered. Above the electric control box of the concrete mixer is a time relay for controlling the water supply quantity of the water pump. The position of the screw pointer is the approximate linear relationship between the time (seconds) and the water supply quantity (rise), which can be determined by one similar adjustment after installation. There are four groups of eleven control buttons in the control box. Press these buttons to control the feeding, water supply and unloading mixing system. The control box is equipped with a secret lock to ensure safety.

自上料水泥搅拌车电机均为单驱动控制。料斗升降、卸料门开关，有连锁控制。料斗下降到终点位置或上升到卸料位置停止，均由料斗行程限位器中的行程开关控制，限位器中，上行程装有两个行程开关，其中一个行程开关处于正常工作状态，另一个行程开关起安全保护作用。

The motor of concrete mixer is controlled by single drive. Hopper lifting and discharging door switch, with interlock control. When the hopper descends to the end position or rises to the discharge position to stop, it is controlled by the travel switch in the hopper travel limiter. In the limiter, there are two travel switches in the upward travel, one of which is in normal working state, and the other is used for safety protection.

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