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、傳動系統傳動系統采用原車發動機取力方式，即通過底盤發動機后輸出取力，重汽豪沃16方攪拌車 將動力經萬向聯軸器傳遞到變量柱塞液壓泵，液壓泵的高壓油驅動定量柱塞馬達，液壓馬達將動力傳遞到減速器上并驅動攪拌筒作正向或反向旋轉，實現進料攪動、攪拌和出料，減速器的輸出法蘭可在+6°的范圍內偏轉，能補償攪拌筒軸線的移位，保證攪拌筒的驅動不受汽車行駛過程中扭曲變形的影響。

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、液壓系統液壓系統主要由液壓泵、液壓馬達、濾油器、油箱、高壓油管、低壓油管、回油管及濾清器等元件組成。液壓泵上設有手動伺服調節手柄，可以調節液壓油的流量及流向，從而控制拌筒的轉向和轉速。攪拌筒的正反轉均能無級調速。

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.

控制系統根據客戶需求分為桿系操縱或軟軸操縱。軸承在正常使用過程中，由于逐漸磨損直到最后失去工作能力、結束其使用壽命，這種自然損傷是難以避免的。但如果因發動機裝配調整不當、潤滑油品質不好或使用條件惡劣等因素致使軸承過早地磨損或出現各種損傷，則是人為造成的早期損壞。

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.

早期損壞不僅大大地降低軸承的使用壽命，同時也會影響發動機的正常工作。商混車根據長期對柴油機維修的經驗發現，滑動軸承早期損壞的常見形式有機械損傷、軸承穴蝕、疲勞點蝕、腐蝕等。在發動機怠速的情況下，將駕駛室內的操縱桿推至“攪拌”位置，此時車輛尾部是操作手柄也應至于“攪拌”位置，此時筒體轉約為4—8rpm；如果攪拌站放料速度快，可將該操作手柄撥至進料“攪拌”位置并加速，此時攪拌筒轉約為8--15rpm;攪拌時攪拌筒的轉向為順時針旋轉（從車尾部往前看，即車輛是行駛方向看）

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)