The emergence and application of automatic feeding mixer can provide a lot of convenience for all kinds of engineering construction. These are the credit of automatic feeding mixer, which improves the operation efficiency of the equipment in the degree of application. If the operator wants to ensure the operation function of the automatic feeding 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?

Automatic feeding mixer

1、自动上料搅拌车离合器损坏的原因动力换挡变速器离合器接合时，液压油的压力战胜绷簧力压紧冲突片。随着液压油压力的升高，冲突片与金属盘接触并逐步压紧，使离合器将飞轮动力平稳地传递到变速器输人轴。

1. When the clutch of the power shift transmission is engaged, the pressure of the hydraulic oil overcomes the tension spring force to compress the conflict plate. With the increase of the hydraulic oil pressure, the collision plate contacts with the metal plate and gradually compresses, which makes the clutch transfer the flywheel power to the transmission shaft smoothly.

每次换挡时，冲突片都要与钢片发作冲突，发生的热量由冷却液散发出去。当冲突片及钢片变薄时，为了使它们充沛接合就需要更多的液压油，发动机须进一步加速，冲突片在钢片上的打滑时刻也随之延长，由此发生的冲突热量也会更多，促使液压油的温度添加，当达到足以改动变速器中密封件功能的温度时，变速器就会发生内泄。

Each shift, the conflict plate and the steel plate conflict, the heat generated by the coolant sent out. When the conflict plate and steel plate become thinner, in order to make them fully engage, more hydraulic oil is needed. The engine must be further accelerated, and the slipping time of the conflict plate on the steel plate will also be prolonged, resulting in more conflict heat, which will promote the temperature of the hydraulic oil to be added. When the temperature is enough to change the function of the seal in the transmission, the transmission will leak internally.

而内泄又从两个方面持续引起热量的添加：高压油经损坏的密封处泄漏，使油温持续升高；因为漏油，液压泵势必要输送更多的油液来确保接合离合器时所需的压力，使离合器充沛地接合，这也要求发动机持续加速，使液压泵发生更大的流量。如此恶性循环，必将导致离合器过热或烧损，直完全失效。

The internal leakage causes heat addition continuously from two aspects: high pressure oil leaks through the damaged seal, so that the oil temperature continues to rise; because of 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 has a greater flow. Such a vicious cycle will lead to overheating or burning of the clutch until complete failure.

2、自动上料搅拌车离合器活塞密封性的检测装载机行走无力或油温过高时，就需要判断是离合器活塞密封不严仍是油压缺乏引起的，但常规检测手法有时很难断定是哪个原因引起毛病，尤其是在无动力的情况下，检查组装好的变速器总成的各密封环就更困难了。

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 caused by the lack of oil pressure. However, it is difficult to determine which reason is caused 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.

此刻，可采用气压阀进行测试。首要，将自动上料搅拌车变速器控制阀拆掉（对组装好的变速器应在装控制阀之前），然后顺次给变速器各油孔通人0.6一0.8MPa的气体，若某一个孔通人气体时，听到"嘭"的一声且无漏气声或漏气声很小进口计量泵，则说明与之对应的离合器活塞与缸筒间的密封良好；若听不到活塞压紧冲突片的声响且漏气声较大，则说明离合器活塞与缸筒间的密封失效，应替换密封件。

At this point, a pneumatic valve can be used for testing. First of all, remove the transmission control valve of the automatic charging mixer truck (before installing the control valve for the assembled transmission), and then pass 0.6-0.8 MPa gas into each oil hole of the transmission in turn. If there is a sound of "bang" and there is no air leakage or very small air leakage sound when a certain hole is filled with gas, the seal between the corresponding clutch piston and cylinder barrel is good If the sound of the piston pressing the collision plate is not heard and the air leakage sound is large, the seal between the clutch piston and cylinder barrel is invalid, and the seal should be replaced.