Concrete mixing tank is a kind of mixing tank widely used in coating, medicine, building materials, chemical industry, pigment, resin, food, scientific research and other industries. The equipment can set up heating or cooling device according to the process of the user's product to meet different process and production needs. The mixing shaft of concrete mixing tank is usually driven by motor. Because the speed of the mixing equipment is generally low, the motor is mostly combined with the transmission, and sometimes the frequency converter is used for direct speed regulation. Today, Xiaobian will give you a detailed explanation of how the mixing shaft of concrete mixing tank works.
混凝土攪拌罐的傳動裝置包括電動機(jī)、變速器、聯(lián)軸器、軸承及機(jī)架等。其中攪拌驅(qū)動機(jī)構(gòu)通常采用電動機(jī)和變速器的組合或選用帶變頻器的電機(jī)，使攪拌達(dá)到需要的轉(zhuǎn)速。
The driving device of concrete mixing tank includes motor, transmission, coupling, bearing and frame. The mixing drive mechanism usually adopts the combination of motor and transmission or the motor with frequency converter to make the mixing reach the required speed.
混凝土攪拌罐電動機(jī)輸出的動力是通過攪拌軸傳遞給攪拌器的，因此攪拌軸必須有足夠的強(qiáng)度。同時，攪拌軸既要與攪拌器連接，又要穿過軸封裝置以及軸承、聯(lián)軸器等零件，所以攪拌軸還應(yīng)有合理的結(jié)構(gòu)、較高的加工精度和配合公差。按支承情況，攪拌軸可分為懸臂式和單跨式。懸臂式攪拌軸在攪拌設(shè)備內(nèi)部不設(shè)置中間軸承或底軸承，因而維護(hù)檢修方便，特別對潔凈度要求較高的生物、食品或藥品攪拌設(shè)備，減少了設(shè)備內(nèi)的構(gòu)件，故應(yīng)優(yōu)先選用。 內(nèi)構(gòu)件 包括擋板、盤管、導(dǎo)流筒、氣體分布器等。
The output power of the motor of the concrete mixing tank is transmitted to the mixer through the mixing shaft, so the mixing shaft must have enough strength. At the same time, the mixing shaft should not only connect with the agitator, but also pass through the shaft seal device, bearing, coupling and other parts, so the mixing shaft should also have reasonable structure, high machining accuracy and fit tolerance. According to the supporting conditions, the mixing shaft can be divided into cantilever type and single span type. Cantilevered mixing shaft is not provided with middle bearing or bottom bearing in the mixing equipment, so it is convenient for maintenance and repair. Especially for biological, food or drug mixing equipment with high cleanliness requirements, the components in the equipment are reduced, so it should be preferred. The internal components include baffle, coil, draft tube, gas distributor, etc.
為攪拌容器內(nèi)液體的打旋現(xiàn)象，使被攪拌的液體上下翻騰而達(dá)到均勻的混合，通常需要再攪拌容器內(nèi)加擋板。通常擋板的寬度約為容器內(nèi)直徑的1/12～1/10，其中設(shè)備內(nèi)的附件如溫度計、傳熱蛇管或各種支撐體也可以起到一定的擋板作用的，但往往達(dá)不到“全擋板條件”。通常增加擋板數(shù)計其寬度，功率消耗也會增加，但增加到一定值以后，功率消耗就不會再增加，此時的工況就稱為“全擋板條件”。
In order to eliminate the swirling phenomenon of the liquid in the stirred vessel and make the stirred liquid churn up and down to achieve uniform mixing, it is usually necessary to add a baffle in the stirred vessel. Generally, the width of the baffle is about 1 / 12 ~ 1 / 10 of the inner diameter of the vessel, and the accessories in the equipment, such as thermometer, heat transfer coil or various supports, can also play a role of baffle, but often can not reach the "full baffle condition". Generally, the power consumption will increase with the increase of baffle width, but when it reaches a certain value, the power consumption will not increase again. The working condition at this time is called "full baffle condition".
在攪拌容器內(nèi)，流體可沿各個方向流向攪拌器，流體的行程長短不一，在需要控制回流的速度和方向，用于確定某一流況時可使用導(dǎo)流筒。導(dǎo)流筒是上下開口的圓筒，安裝在容器內(nèi)，在攪拌混合中起導(dǎo)流作用，既可提高容器內(nèi)流體的攪拌程度，攪拌罐加強(qiáng)攪拌器對流體的直接剪切作用，又造成一定的循環(huán)流，使容器內(nèi)流體均可通過導(dǎo)流筒內(nèi)強(qiáng)烈混合區(qū)，提高混合效率。安裝導(dǎo)流筒后，限定了循環(huán)路徑，減少了流體短路的機(jī)會。導(dǎo)流筒主要用于推進(jìn)式、螺桿式以及渦輪式攪拌器的導(dǎo)流。
In the stirred vessel, the fluid can flow to the agitator in all directions, and the length of the fluid stroke is different. When it is necessary to control the speed and direction of the reflux, the guide tube can be used to determine a first-class condition. The guide cylinder is a cylinder with upper and lower openings, which is installed in the container and plays a guiding role in the mixing process. It can not only improve the mixing degree of the fluid in the container, but also strengthen the direct shear effect of the agitator on the fluid in the mixing tank, and create a certain circulation flow, so that the fluid in the container can pass through the strong mixing area in the guide cylinder and improve the mixing efficiency. After installing the draft tube, the circulation path is limited and the chance of fluid short circuit is reduced. The draft tube is mainly used for the diversion of propelling, screw and turbine agitators.
