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.

攪拌車可能出現雜音的地方有很多，比如柱塞或馬達，還有溢流閥或者管路等等。

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

首先我們來看一下柱塞或馬達出現噪音是怎么回事吧。

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

吸空現象時造成液壓泵噪音過高的主要原因之一。當油液中混入空氣后，很容易在高壓區形成氣穴現象，并以壓力波的形式傳播，造成油液震蕩，導致系統產生氣蝕噪音，主要原因有兩方面；液壓泵內部元件過度磨損，如柱塞泵的缸體與配流盤、柱塞孔等配合件的磨損、拉傷，使液壓泵內泄漏嚴重，當液壓泵輸出高壓、小流量油液時將產生流量脈動，引發較高噪音。此時可適當加大先導系統變量的機構偏角，以改善內泄漏對泵輸出流量的影響。液壓泵的伺服閥閥芯、控制流量的活塞也會因局部磨損、拉傷，使活塞在移動的過程中脈動，造成液壓泵輸出流量和壓力的波動，從而在泵出口產生較大振動和噪音。此時可對磨損、拉傷嚴重的元件進行刷鍍研配或更換處理。

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.

液壓泵流盤也是引發噪音的重要元件之一。配流盤在使用中因表面磨損或油泥沉積在卸荷槽開啟處，都會是卸荷槽變短而改變卸荷位置，產生困油現象，繼而引發較高噪音。

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.

溢流閥也會產生噪音，其原因主要有三個方面：一是，油液中混入空氣，在先導閥前腔內形成氣穴現象而引發噪音。此時只要排盡空氣就可解決噪音問題；二是，針閥過度磨損，致使針閥錐面與閥座不能密合，造成先導流量不穩定、產生壓力波動而引發噪音，此時更換針閥或及時修理即可；三是，先導閥因彈簧疲勞變形造成其調壓功能不穩定，使得壓力波動過大而引發噪音，此時應更換彈簧。

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.

攪拌車的管路也會產生噪音，原因多半是管路死彎過多或固定卡子松脫。所以在管路的布置上應該避免死彎，對松脫的卡子須及時擰緊。

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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