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自動(dòng)攪拌車(chē)的液壓系統的可靠性是用主機液壓系統在額定工況正常操縱下，無(wú)故障使用時(shí)間來(lái)表示的。顯然，無(wú)故障使用時(shí)間越長(cháng)，可靠性越好。下面來(lái)講講自動(dòng)攪拌車(chē)液壓系統故障原因分析。

The reliability of the hydraulic system of the automatic mixer truck is expressed by the trouble free service time of the host hydraulic system under normal operation under rated working conditions. Obviously, the longer the trouble free service time is, the better the reliability is. Now let's talk about the cause analysis of the hydraulic system failure of the automatic mixer.

（1）空載下，轉罐轉速可達到設計要求，而裝滿(mǎn)料以后很難起動(dòng)，即使在發(fā)動(dòng)機大轉速下轉罐轉速也很低；（2）液壓油散馬達的進(jìn)油膠管出現多臺爆管故障；（3）轉罐馬達的故障率非常高，多臺出現馬達內部卡死或軸端密封損壞向外串油。

(1) Under no load, the rotating speed of the can can meet the design requirements, but it is difficult to start when the material is full, even under high engine speed, the rotating speed of the can is very low; (2) The oil inlet hose of the hydraulic oil dispersion motor has multiple tube explosion failures; (3) The failure rate of the rotary drum motor is very high, and several motors are stuck internally or the shaft end seal is damaged and oil flows outward.

從原理上來(lái)看，液壓系統為開(kāi)式負載敏感開(kāi)芯回路，通過(guò)安裝在發(fā)動(dòng)機上的齒輪泵持續向換向閥供油，由先導控制閥作為總開(kāi)關(guān)，通過(guò)控制電磁換向閥的翹板開(kāi)關(guān)實(shí)現轉罐馬達的正轉與反轉。換向閥的回油分兩路回油箱：一路通過(guò)節流閥回油箱，另一路驅動(dòng)油散馬達，為其他系統的回油進(jìn)行散熱。

In principle, the hydraulic system is an open load sensing open core circuit. The gear pump installed on the engine continuously supplies oil to the reversing valve. The pilot control valve acts as the main switch, and the rocker switch of the solenoid reversing valve controls the forward and reverse rotation of the rotary tank motor. The return oil of the reversing valve returns to the oil tank in two ways: one returns to the oil tank through the throttle valve, and the other drives the oil dispersion motor to dissipate heat for the return oil of other systems.

通過(guò)故障情況與原理對比分析，認為換向閥的回油通過(guò)節流閥的閥口來(lái)控制油散馬達的工作轉速，且節流閥閥口是在出廠(chǎng)前根據發(fā)動(dòng)機怠速調節油散馬達轉速的，一旦節流閥閥口固定，通油能力就會(huì )被限制在一定的范圍內，然而換向閥的輸出流量與發(fā)動(dòng)機的轉速成正比關(guān)系。

Through the comparative analysis of fault conditions and principles, it is believed that the return oil of the reversing valve controls the working speed of the oil dispersion motor through the throttle valve port, and the throttle valve port regulates the speed of the oil dispersion motor according to the engine idle speed before leaving the factory. Once the throttle valve port is fixed, the oil flow capacity will be limited to a certain range. However, the output flow of the reversing valve is proportional to the engine speed.

在發(fā)動(dòng)機高速運轉時(shí)，換向閥T口油液無(wú)法快速回到油箱，造成油散馬達的進(jìn)油管處壓力過(guò)高，超過(guò)膠管承受的壓力，所以爆管現象時(shí)有發(fā)生。因無(wú)法得到更詳細的技術(shù)參數與資料，重載轉速慢及馬達故障率高是否有直接關(guān)聯(lián)，通過(guò)現場(chǎng)查看實(shí)車(chē)的系統現狀及使用過(guò)程工況，從使用工況來(lái)分析故障原因。

When the engine is running at high speed, the oil at port T of the reversing valve cannot return to the oil tank quickly, which causes the pressure at the oil inlet pipe of the oil dispersion motor to be too high, which exceeds the pressure borne by the rubber tube. Therefore, tube explosion occurs frequently. Since more detailed technical parameters and data can not be obtained, whether there is a direct correlation between slow heavy load speed and high motor failure rate, we can analyze the cause of the failure from the operating conditions through on-site inspection of the actual vehicle's system status and operating conditions.

從現場(chǎng)的管路情況看到，吸油管過(guò)長(cháng)過(guò)細，且齒輪泵的位置高于油箱吸油口的位置，經(jīng)理論計算齒輪泵吸油管液壓油大流速達到4m/s，遠超過(guò)設計標準。同時(shí)，齒輪泵本身的自吸能力差，在高轉速時(shí)吸油管內產(chǎn)生負壓，齒輪泵內部吸油不足加速磨損，容積效率快速下降，導致轉罐在重載情況下轉速下降明顯。

It can be seen from the on-site pipeline that the oil suction pipe is too long and thin, and the position of the gear pump is higher than the position of the oil suction port of the oil tank. Through theoretical calculation, the large flow rate of hydraulic oil in the gear pump oil suction pipe reaches 4m/s, far exceeding the design standard. At the same time, the self suction capacity of the gear pump itself is poor, and negative pressure is generated in the oil suction pipe at high speed. The insufficient oil suction inside the gear pump accelerates wear, and the volumetric efficiency drops rapidly, resulting in a significant drop in the speed of the rotary tank under heavy load.

自動(dòng)攪拌車(chē)一般從攪拌站裝上攪拌好的混凝土，轉運工地使用；而自動(dòng)攪拌車(chē)一般是在工地附近，具有自裝卸、配料與自攪拌功能，減少長(cháng)距離運輸且省工的特點(diǎn)。更多相關(guān)內容就來(lái)我們網(wǎng)站http://m.jackpetty.net咨詢(xún)吧！

The automatic mixer truck generally loads the mixed concrete from the mixing plant and transfers it to the construction site for use; The automatic mixer is generally located near the construction site, with self loading and unloading, batching and self mixing functions, reducing long-distance transportation and saving labor. More relevant content will come to our website http://m.jackpetty.net Consult!