The main transportation medium of self loading mixer is premixed concrete, which is generally wet material transportation. The requirement of transportation efficiency is very high, because the period of validity of wet material is relatively short. If it exceeds, it will condense into blocks and lose its function. There are many accessories on the mixer, among which the most important are three hydraulic parts: reducer, hydraulic pump and hydraulic motor, Now we mainly to understand the knowledge of imported reducer. There are two kinds of reducers: imported and domestic. Generally, domestic brands are used in small mixer trucks, while imported brands are used in large mixer trucks. Reducers are mainly composed of box, reducer accessories, gears, shafts and bearings.
自上料搅拌车看箱体：它是减速机的重要组成部分，是传动零件的基座，必须具备足够的强度和刚度，箱体通常用灰铸铁制作，对于重载或者有冲击载荷的减速机也可采用铸钢箱体，单体生产的减速机，为了简化制作工艺，降低生产成本，可采用钢板焊接的箱体。
From the feeding mixer, first look at the box: it is an important part of the reducer. It is the base of transmission parts and must have sufficient strength and stiffness. The box is usually made of gray cast iron. For the reducer with heavy load or impact load, the cast steel box can also be used. For the reducer produced by single body, in order to simplify the manufacturing process and reduce the production cost, the box can be used, The box can be welded with steel plate.
减速机附件：减速机附件包含的东西比较多，比如加速机的润滑油，平时使用过程中要注意观察油面的高度、排油、注油等问题。
Reducer accessories: reducer accessories contain a lot of things, such as the lubricating oil of the accelerator. During normal use, pay attention to the height of the oil surface, oil drainage, oil filling and other issues.
自上料搅拌车，然后是齿轮、轴及轴承组合：小齿轮与轴制成一体，称齿轮轴，这种结构用于齿轮直径与轴的直径相关不大的情况下，如果轴的直径为d，齿轮齿根圆的直径为df，则当df-d≤6——7mn时，应采用这种结构，而当df-d＞6——7mn时，采用齿轮与轴分开为两个零件的结构，如低速轴与大齿轮，此时齿轮与轴的轴向固定平键连接，轴上零件利用轴肩、轴套和轴承盖作轴向固定，两轴均采用了深沟球轴承。这种进口减速机具有设计独特、使用寿命长、噪音低、方便等优点。
This structure is used when the diameter of the gear is not closely related to the diameter of the shaft. If the diameter of the shaft is D and the diameter of the gear root circle is DF, this structure should be adopted when df-d ≤ 6-7mn, and when df-d > 6-7mn, The gear and shaft are separated into two parts, such as the low speed shaft and the large gear. At this time, the gear and the shaft are connected by the axial fixed flat key. The shaft parts are fixed axially by the shaft shoulder, the shaft sleeve and the bearing cover. The deep groove ball bearings are used for both shafts. The imported reducer has the advantages of unique design, long service life, low noise, safety and convenience.
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