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.
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、聯軸器等零件，所以攪拌軸還應有合理的結構、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備內部不設置中間軸承或底軸承，因而維護檢修方便，特別對潔凈度要求較高的生物、食品或藥品攪拌設備，減少了設備內的構件，故應優先選用。 內構件 包括擋板、盤管、導流筒、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.
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".
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.