It is said that the plan of a year lies in spring. When winter goes and spring comes, all walks of life begin to get busy. The mixer drivers are no exception. The mixer trucks on the construction site are busy all the time. The old drivers are very familiar with the performance of their vehicles. Some new drivers report that the mixer truck occasionally makes abnormal noise. What's the matter? Today, I will explain this problem to you.

搅拌车可能出现杂音的地方有很多，比如柱塞或马达，还有溢流阀或者管路等等。

There are many places where the mixer may make noise, such as plunger or motor, overflow valve or pipeline, etc.

首先我们来看一下柱塞或马达出现噪音是怎么回事吧。

First, let's take a look at the noise of the plunger or motor.

吸空现象时造成液压泵噪音过高的主要原因之一。当油液中混入空气后，很容易在高压区形成气穴现象，并以压力波的形式传播，造成油液震荡，导致系统产生气蚀噪音，主要原因有两方面；液压泵内部元件过度磨损，如柱塞泵的缸体与配流盘、柱塞孔等配合件的磨损、拉伤，使液压泵内泄漏严重，当液压泵输出高压、小流量油液时将产生流量脉动，引发较高噪音。此时可适当加大先导系统变量的机构偏角，以改善内泄漏对泵输出流量的影响。液压泵的伺服阀阀芯、控制流量的活塞也会因局部磨损、拉伤，使活塞在移动的过程中脉动，造成液压泵输出流量和压力的波动，从而在泵出口产生较大振动和噪音。此时可对磨损、拉伤严重的元件进行刷镀研配或更换处理。

Suction phenomenon is one of the main causes of high noise of hydraulic pump. When the oil is mixed with air, it is easy to form cavitation in the high-pressure area and propagate in the form of pressure wave, resulting in oil shock and cavitation noise in the system. There are two main reasons; The internal components of the hydraulic pump are excessively worn, such as the wear and strain of the cylinder body of the plunger pump, the valve plate, the plunger hole and other mating parts, resulting in serious leakage in the hydraulic pump. When the hydraulic pump outputs high-pressure and small flow oil, it will produce flow pulsation and cause high noise. At this time, the mechanism deflection angle of the pilot system variable can be appropriately increased to improve the influence of internal leakage on the pump output flow. The servo valve spool of the hydraulic pump and the piston controlling the flow will also be subject to local wear and tear, which will make the piston pulsating in the process of moving, causing fluctuations in the output flow and pressure of the hydraulic pump, resulting in greater vibration and noise at the pump outlet. At this time, components with serious wear and tear can be brush plated, matched or replaced.

液压泵流盘也是引发噪音的重要元件之一。配流盘在使用中因表面磨损或油泥沉积在卸荷槽开启处，都会是卸荷槽变短而改变卸荷位置，产生困油现象，继而引发较高噪音。

The flow plate of hydraulic pump is also one of the important components causing noise. When the valve plate is in use, the surface is worn or oil sludge is deposited at the opening of the unloading groove, which will cause the unloading position to change due to the shortening of the unloading groove, resulting in oil trapping, and then cause higher noise.

溢流阀也会产生噪音，其原因主要有三个方面：一是，油液中混入空气，在先导阀前腔内形成气穴现象而引发噪音。此时只要排尽空气就可解决噪音问题；二是，针阀过度磨损，致使针阀锥面与阀座不能密合，造成先导流量不稳定、产生压力波动而引发噪音，此时更换针阀或及时修理即可；三是，先导阀因弹簧疲劳变形造成其调压功能不稳定，使得压力波动过大而引发噪音，此时应更换弹簧。

The overflow valve will also produce noise, which is mainly caused by three aspects: first, air is mixed in the oil, and cavitation is formed in the front chamber of the pilot valve, causing noise. At this time, the noise problem can be solved as long as the air is exhausted; Second, the needle valve is excessively worn, so that the conical surface of the needle valve and the valve seat can not be closely closed, resulting in unstable pilot flow and pressure fluctuation, resulting in noise. At this time, replace the needle valve or repair it in time; Thirdly, the pressure regulating function of the pilot valve is unstable due to the fatigue deformation of the spring, resulting in excessive pressure fluctuation and noise. At this time, the spring should be replaced.

搅拌车的管路也会产生噪音，原因多半是管路死弯过多或固定卡子松脱。所以在管路的布置上应该避免死弯，对松脱的卡子须及时拧紧。

The pipeline of the mixer truck will also produce noise, which is mostly due to excessive dead bending of the pipeline or loose fixing clips. Therefore, dead bends should be avoided in the layout of pipelines, and loose clamps should be tightened in time.

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