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The emergence and use of automatic feeding mixer can provide many conveniences for all kinds of engineering construction. These are the credit of automatic feeding mixer, which improves the operation efficiency of the equipment to a certain extent. If the user wants to ensure the performance of the automatic charging mixer, one of the important accessories is the transmission shift machine. If each accessory is used for a long time, there will be some problems. How to repair it after it is damaged? The author will explain it.

1、自動上料攪拌車離合器損壞的原因動力換擋變速器離合器接合時，液壓油的壓力克服彈簧力壓緊摩擦片。隨著液壓油壓力的升高，摩擦片與金屬盤接觸并逐漸壓緊，使離合器將飛輪動力平穩(wěn)地傳遞到變速器輸人軸。每次換擋時，摩擦片都要與鋼片發(fā)生摩擦，產(chǎn)生的熱量由冷卻液散發(fā)出去。當(dāng)摩擦片及鋼片變薄時，為了使它們充分接合就需要更多的液壓油，發(fā)動機須進一步加速，摩擦片在鋼片上的打滑時間也隨之延長，由此產(chǎn)生的摩擦熱量也會更多，促使液壓油的溫度增加，當(dāng)達到足以改變變速器中密封件性能的溫度時，變速器就會產(chǎn)生內(nèi)泄。而內(nèi)泄又從兩個方面繼續(xù)引起熱量的增加：高壓油經(jīng)損壞的密封處泄漏，使油溫繼續(xù)升高；由于漏油，液壓泵勢必要輸送更多的油液來保證接合離合器時所需的壓力，使離合器充分地接合，這也要求發(fā)動機繼續(xù)加速，使液壓泵產(chǎn)生更大的流量。如此惡性循環(huán)，必將導(dǎo)致離合器過熱或燒損，直完全失效。
         

1. When the clutch of power shift transmission is engaged, the pressure of hydraulic oil overcomes the force of spring to press the friction plate. With the increase of the hydraulic oil pressure, the friction plate contacts with the metal plate and gradually compresses, which makes the clutch transfer the flywheel power to the transmission shaft smoothly. Every time the gear is shifted, the friction plate will rub with the steel plate, and the heat generated will be sent out by the coolant. When the friction plate and steel plate become thinner, more hydraulic oil is needed in order to make them fully engage. The engine must be further accelerated, and the sliding time of friction plate on steel plate will also be prolonged, resulting in more friction heat, which will increase the temperature of hydraulic oil. When the temperature is enough to change the performance of sealing parts in the transmission, the transmission will have internal leakage. And the internal leakage continues to cause heat increase from two aspects: high pressure oil leakage through the damaged seal, so that the oil temperature continues to rise; due to oil leakage, the hydraulic pump is necessary to deliver more oil to ensure the pressure required to engage the clutch, so that the clutch is fully engaged, which also requires the engine to continue to accelerate, so that the hydraulic pump produces greater flow. Such a vicious cycle will lead to overheating or burning of the clutch until complete failure.

2、自動上料攪拌車離合器活塞密封性的檢測裝載機行走無力或油溫過高時，就需要判斷是離合器活塞密封不嚴(yán)還是油壓不足引起的，但常規(guī)檢測手段有時很難斷定是哪個原因引起故障，尤其是在無動力的情況下，檢查組裝好的變速器總成的各密封環(huán)就更困難了。此時，可采用氣壓閥進行測試。，將自動上料攪拌車變速器控制閥拆掉（對組裝好的變速器應(yīng)在裝控制閥之前），然后依次給變速器各油孔通人0.6一0.8MPa的氣體，若某一個孔通人氣體時，聽到"嘭"的一聲且無漏氣聲或漏氣聲很小進口計量泵，則說明與之對應(yīng)的離合器活塞與缸筒間的密封良好；若聽不到活塞壓緊摩擦片的聲響且漏氣聲較大，則說明離合器活塞與缸筒間的密封失效，應(yīng)更換密封件。

2. When the loader cannot walk or the oil temperature is too high, it is necessary to judge whether the clutch piston seal is not tight or the oil pressure is insufficient. However, it is difficult to determine which cause the fault by conventional detection methods, especially in the case of no power, it is more difficult to check the seal rings of the assembled transmission assembly. At this time, the pneumatic valve can be used for testing. Firstly, remove the transmission control valve of the automatic charging mixer (before installing the control valve for the assembled transmission), and then fill the oil holes of the transmission with 0.6-0.8 MPa gas. If a hole is filled with gas, and there is no air leakage or the leakage sound is very small, it indicates that the corresponding clutch piston and cylinder barrel are well sealed If the sound of the piston pressing the friction plate is not heard and the air leakage is large, the seal between the clutch piston and cylinder barrel is invalid, and the seal should be replaced.

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