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.
混凝土搅拌罐的传动装置包括电动机、变速器、联轴器、轴承及机架等。其中搅拌驱动机构通常采用电动机和变速器的组合或选用带变频器的电机，使搅拌达到需要的转速。
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.
混凝土搅拌罐电动机输出的动力是通过搅拌轴传递给搅拌器的，因此搅拌轴必须有足够的强度。同时，搅拌轴既要与搅拌器连接，又要穿过轴封装置以及轴承、联轴器等零件，所以搅拌轴还应有合理的结构、较高的加工精度和配合公差。按支承情况，搅拌轴可分为悬臂式和单跨式。悬臂式搅拌轴在搅拌设备内部不设置中间轴承或底轴承，因而维护检修方便，特别对洁净度要求较高的生物、食品或药品搅拌设备，减少了设备内的构件，故应优先选用。 内构件 包括挡板、盘管、导流筒、气体分布器等。
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.
为搅拌容器内液体的打旋现象，使被搅拌的液体上下翻腾而达到均匀的混合，通常需要再搅拌容器内加挡板。通常挡板的宽度约为容器内直径的1/12～1/10，其中设备内的附件如温度计、传热蛇管或各种支撑体也可以起到一定的挡板作用的，但往往达不到“全挡板条件”。通常增加挡板数计其宽度，功率消耗也会增加，但增加到一定值以后，功率消耗就不会再增加，此时的工况就称为“全挡板条件”。
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".
在搅拌容器内，流体可沿各个方向流向搅拌器，流体的行程长短不一，在需要控制回流的速度和方向，用于确定某一流况时可使用导流筒。导流筒是上下开口的圆筒，安装在容器内，在搅拌混合中起导流作用，既可提高容器内流体的搅拌程度，搅拌罐加强搅拌器对流体的直接剪切作用，又造成一定的循环流，使容器内流体均可通过导流筒内强烈混合区，提高混合效率。安装导流筒后，限定了循环路径，减少了流体短路的机会。导流筒主要用于推进式、螺杆式以及涡轮式搅拌器的导流。
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.
