Mixing drum is the main component of concrete truck, which is mainly composed of cylinder, sealing pipe, blade and mixing blade. The funnel-shaped sealing pipe can ensure smooth feeding. The curved blade is conducive to the discharge performance of low slump concrete. There are holes on the blade, which can reduce the adhesion of concrete on it and improve the quality of ready mixed concrete. The whole mixing cylinder is installed above the support, supported by two supporting rollers in the front, and the mixing cylinder is provided with manhole for easy maintenance.

2、传动系统传动系统采用原车发动机取力方式，即通过底盘发动机后输出取力，重汽豪沃16方搅拌车 将动力经万向联轴器传递到变量柱塞液压泵，液压泵的高压油驱动定量柱塞马达，液压马达将动力传递到减速器上并驱动搅拌筒作正向或反向旋转，实现进料搅动、搅拌和出料，减速器的输出法兰可在+6°的范围内偏转，能补偿搅拌筒轴线的移位，保证搅拌筒的驱动不受汽车行驶过程中扭曲变形的影响。

2. Transmission system the transmission system adopts the power take-off mode of the original vehicle engine, that is, the power is output through the chassis engine. The heavy truck HOWO 16 square mixer transmits the power to the variable plunger hydraulic pump through the universal coupling. The high-pressure oil of the hydraulic pump drives the quantitative plunger motor. The hydraulic motor transmits the dynamic force to the reducer and drives the mixing drum to rotate forward or reverse, so as to realize feed stirring For mixing and discharging, the output flange of the reducer can be deflected within the range of + 6 °, which can compensate the displacement of the axis of the mixing drum and ensure that the driving of the mixing drum is not affected by the distortion and deformation during vehicle driving.

3、液压系统液压系统主要由液压泵、液压马达、滤油器、油箱、高压油管、低压油管、回油管及滤清器等元件组成。液压泵上设有手动伺服调节手柄，可以调节液压油的流量及流向，从而控制拌筒的转向和转速。搅拌筒的正反转均能无级调速。

3. Hydraulic system the hydraulic system is mainly composed of hydraulic pump, hydraulic motor, oil filter, oil tank, high-pressure oil pipe, low-pressure oil pipe, oil return pipe and filter. The hydraulic pump is equipped with a manual servo control handle, which can adjust the flow and direction of hydraulic oil, so as to control the steering and speed of the mixing drum. The forward and reverse rotation of the mixing drum can be stepless speed regulation.

控制系统根据客户需求分为杆系操纵或软轴操纵。轴承在正常使用过程中，由于逐渐磨损直到失去工作能力、结束其使用寿命，这种自然损伤是难以避免的。但如果因发动机装配调整不当、润滑油品质不好或使用条件恶劣等因素致使轴承过早地磨损或出现各种损伤，则是人为造成的早期损坏。

The control system can be divided into linkage control or flexible shaft control according to customer requirements. In the process of normal use, due to the gradual wear of the bearing until it finally loses its working capacity and ends its service life, this natural damage is inevitable. However, if the bearing is prematurely worn or damaged due to improper engine assembly and adjustment, poor lubricating oil quality or poor service conditions, it is an early damage caused by man-made.

早期损坏不仅大大地降低轴承的使用寿命，同时也会影响发动机的正常工作。商混车根据长期对柴油机维修的经验发现，滑动轴承早期损坏的常见形式有机械损伤、轴承穴蚀、疲劳点蚀、腐蚀等。在发动机怠速的情况下，将驾驶室内的操纵杆推“搅拌”位置，此时车辆尾部是操作手柄也应于“搅拌”位置，此时筒体转约为4—8rpm；如果搅拌站放料速度快，可将该操作手柄拨进料“搅拌”位置并加速，此时搅拌筒转约为8--15rpm;搅拌时搅拌筒的转向为顺时针旋转（从车尾部往前看，即车辆是行驶方向看）

Early damage not only greatly reduces the service life of the bearing, but also affects the normal operation of the engine. According to the long-term experience of diesel engine maintenance, it is found that the common forms of early damage of sliding bearing are mechanical damage, bearing pitting corrosion, fatigue pitting corrosion, etc. When the engine is idling, push the control lever in the cab to the "mixing" position. At this time, the operating handle at the rear of the vehicle should also be in the "mixing" position. At this time, the cylinder turns about 4-8rpm; If the discharging speed of the mixing plant is fast, turn the operating handle to the feeding "mixing" position and accelerate it. At this time, the mixing drum rotates about 8-15rpm; During mixing, the mixing drum rotates clockwise (looking forward from the rear of the vehicle, that is, the vehicle is looking in the driving direction)