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自動攪拌車的液壓系統(tǒng)的可靠性是用主機(jī)液壓系統(tǒng)在額定工況正常操縱下，無故障使用時間來表示的。顯然，無故障使用時間越長，可靠性越好。下面來講講自動攪拌車液壓系統(tǒng)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(zhuǎn)罐轉(zhuǎn)速可達(dá)到設(shè)計(jì)要求，而裝滿料以后很難起動，即使在發(fā)動機(jī)大轉(zhuǎn)速下轉(zhuǎn)罐轉(zhuǎn)速也很低；（2）液壓油散馬達(dá)的進(jìn)油膠管出現(xiàn)多臺爆管故障；（3）轉(zhuǎn)罐馬達(dá)的故障率非常高，多臺出現(xiàn)馬達(dá)內(nèi)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.

從原理上來看，液壓系統(tǒng)為開式負(fù)載敏感開芯回路，通過安裝在發(fā)動機(jī)上的齒輪泵持續(xù)向換向閥供油，由先導(dǎo)控制閥作為總開關(guān)，通過控制電磁換向閥的翹板開關(guān)實(shí)現(xiàn)轉(zhuǎn)罐馬達(dá)的正轉(zhuǎn)與反轉(zhuǎn)。換向閥的回油分兩路回油箱：一路通過節(jié)流閥回油箱，另一路驅(qū)動油散馬達(dá)，為其他系統(tǒng)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.

通過故障情況與原理對比分析，認(rèn)為換向閥的回油通過節(jié)流閥的閥口來控制油散馬達(dá)的工作轉(zhuǎn)速，且節(jié)流閥閥口是在出廠前根據(jù)發(fā)動機(jī)怠速調(diào)節(jié)油散馬達(dá)轉(zhuǎn)速的，一旦節(jié)流閥閥口固定，通油能力就會被限制在一定的范圍內(nèi)，然而換向閥的輸出流量與發(fā)動機(jī)的轉(zhuǎn)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)動機(jī)高速運(yùn)轉(zhuǎn)時，換向閥T口油液無法快速回到油箱，造成油散馬達(dá)的進(jìn)油管處壓力過高，超過膠管承受的壓力，所以爆管現(xiàn)象時有發(fā)生。因無法得到更詳細(xì)的技術(shù)參數(shù)與資料，重載轉(zhuǎn)速慢及馬達(dá)故障率高是否有直接關(guān)聯(lián)，通過現(xiàn)場查看實(shí)車的系統(tǒng)現(xiàn)狀及使用過程工況，從使用工況來分析故障原因。

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(xiàn)場的管路情況看到，吸油管過長過細(xì)，且齒輪泵的位置高于油箱吸油口的位置，經(jīng)理論計(jì)算齒輪泵吸油管液壓油大流速達(dá)到4m/s，遠(yuǎn)超過設(shè)計(jì)標(biāo)準(zhǔn)。同時，齒輪泵本身的自吸能力差，在高轉(zhuǎn)速時吸油管內(nèi)產(chǎn)生負(fù)壓，齒輪泵內(nèi)部吸油不足加速磨損，容積效率快速下降，導(dǎo)致轉(zhuǎn)罐在重載情況下轉(zhuǎn)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.

自動攪拌車一般從攪拌站裝上攪拌好的混凝土，轉(zhuǎn)運(yùn)工地使用；而自動攪拌車一般是在工地附近，具有自裝卸、配料與自攪拌功能，減少長距離運(yùn)輸且省工的特點(diǎn)。更多相關(guān)內(nèi)容就來我們網(wǎng)站http://www.fxsgujg.cn咨詢吧！

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://www.fxsgujg.cn Consult!