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.

自上料水泥攪拌車電氣系統包括攪拌電動機，提升用制動電動機，微型水泵電機電動推桿電機五個行程開關和控制箱，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.

自上料水泥攪拌車控制線電壓為380伏，合上控制箱側面的電源總開關接通外電源控制箱上方的電源指示燈顯示，表示整個線路已供電。自上料水泥攪拌車電氣控制箱上方還有控制水泵供水量用的時間繼電器，擰動指針位置即是時間（秒）與供水量（升）近似線性關系，安裝后似調一次即可確定?？刂葡溆兴慕M共十一個控制按鈕，按動這些控制按鈕即可控制上料、供水、卸料攪拌系統工作?？刂葡溲b有暗鎖，確保安全。

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.

自上料水泥攪拌車電機均為單驅動控制。料斗升降、卸料門開關，有連鎖控制。料斗下降到終點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開關控制，限位器中，上行程裝有兩個行程開關，其中一個行程開關處于正常工作狀態(tài)，另一個行程開關起安全保護作用。

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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