How to get mixing tanks?
What is a mixing tank?
The stainless steel mixing tank can realize feeding control, discharging control, stirring control and other manual automatic control during the stirring process.
Mixing tank can also be called water phase tank, widely used in coatings, medicine, building materials, chemical industry, pigment, resin, food, scientific research and other industries. The equipment can be made of carbon steel and stainless steel according to the technical requirements of the user’s products, and set up heating and cooling equipment to meet the different process and production needs. It has the characteristics of reasonable design, advanced technology and durable, easy to operate and easy to use, and is an ideal chemical equipment with less investment, faster production and higher income.
The structure of the stirring tank: The stirring tank is composed of a stirring tank body, a stirring tank cover, a stirrer, a support, a transmission device, a shaft sealing device, etc., and a heating device or a cooling device may also be configured according to the process requirements.
The mixing tank, stirring tank lid, stirrer, shaft seal and other optional materials can be made of carbon steel or stainless steel according to different process requirements. The mixing tank body and the stirring tank cover can be flanged or welded. The stirring tank body and the stirring tank cover can be opened according to the process requirements, such as feeding, discharging, observation, temperature measurement, pressure measurement, steam fractionation, and safe venting. The upper part of the mixing tank cover is equipped with a transmission device (motor or speed reducer), and the drive shaft drives the stirrer in the mixing tank. Shaft sealing devices can be machine seals or packings, labyrinth seals and other forms (according to user needs). Due to different requirements of the user’s production process, the stirrer can be configured in a variety of forms, such as slurry, anchor, frame, and spiral. If you have other requirements can contact with the factory, design and production separately. 
The power output by the motor in the stirring device is transmitted to the stirrer through the stirring shaft, so the stirring shaft must have sufficient strength. At the same time, the agitator shaft must not only be connected with the agitator, but also pass through the shaft seal device as well as the bearings, couplings and other components. Therefore, the agitator shaft should also have a reasonable structure, high processing accuracy and fit tolerance.
According to the bearing conditions, the agitator shaft can be divided into cantilever type and single span type. The cantilever-type stirring shaft does not provide an intermediate bearing or a bottom bearing inside the stirring device. Therefore, it is convenient to maintain and inspect, especially a biological, food or pharmaceutical mixing device with a high requirement for cleanliness, which reduces the components in the device and should be preferred.
Including baffles, coils, guide tubes, gas distributors, etc.
In order to eliminate the swirling phenomenon of the liquid in the stirring container, the stirred liquid is up and down to achieve uniform mixing, and it is usually necessary to add a baffle in the stirring container. Generally, the width of the baffle is about 1/12 to 1/10 of the inner diameter of the container, and accessories such as a thermometer, a heat transfer coil, or various supports in the device may also function as a baffle, but they often do not reach the limit. To “full-border condition”. Generally increasing the width of the baffle means that the power consumption will also increase, but after increasing to a certain value, the power consumption will not increase again, and the working conditions at this time will be called “full baffle conditions”.
In the stirring vessel, the fluid can flow to the agitator in all directions. The length of the fluid is different. When it is necessary to control the speed and direction of the reflux, a flow guiding cylinder can be used to determine a certain flow condition. The guide tube is a cylinder that is open up and down. It is installed in the container. It acts as a guide during stirring and mixing. It can increase the stirring degree of the fluid in the container and enhance the direct shearing effect of the stirrer on the fluid. It also causes a certain cycle. The flow allows the fluid in the container to pass through the strong mixing zone in the draft tube to improve the mixing efficiency. After installing the draft tube, the circulation path is limited, reducing the chance of fluid short circuit. The draft tube is mainly used for the flow guidance of propeller, screw and turbine agitators. 
The shaft seal is an important part of the stirring equipment. Shaft seal is a dynamic seal, its role is to ensure that the stirring equipment is in a certain positive pressure or vacuum state to prevent the material being stirred from escaping and the penetration of impurities, so not all shaft seal types can be used for mixing equipment. In the mixing equipment, the most commonly used shaft seals are liquid seals, packing seals and mechanical seals.
When the working pressure in the stirring equipment is normal pressure, the role of the shaft seal is only to prevent dust and impurities from entering the internal working medium, or when the isolated working medium and the surrounding medium around the stirring equipment are in contact with each other, a liquid seal may be used. The liquid seal structure is simple and there are no parts that cause friction due to direct contact with the drive shaft. However, in order to ensure that the gap between the cylindrical shell or the stationary element and the rotating element meets the design requirements, the processing and installation requirements for the parts of the sealing part are relatively high.
At the same time, due to structural characteristics, the use of liquid seals is narrow. Generally applicable to the working medium is non-inflammable or toxic degree of mild damage, the working pressure within the equipment is equal to atmospheric pressure, and the temperature range of 20-80 °C occasions.
It is worth noting that the liquid working medium should not be filled with stirring equipment; and the sealing fluid should use the working medium in the stirring equipment as much as possible, or a neutral liquid that does not have physical and chemical interaction with the working medium, and at the same time it must be less volatile and not pollute the atmosphere. 
It is a kind of rotating shaft sealing structure used earlier in mixing equipment. It has the advantages of simple structure, low manufacturing requirements and convenient maintenance. However, its packing is easy to wear, and the sealing reliability is poor. Generally, it is only suitable for normal pressure or low-pressure low-rotation, non-corrosive and weak corrosive media, and allows for regular maintenance of the mixing equipment.
The mechanical seal is a device that changes the sealing surface of the shaft from the axial direction to the radial direction, and adheres to the two end surfaces of the moving ring and the stationary ring, and performs relative movement to achieve the sealing device, which is also called end surface sealing. Mechanical seal has a low leakage rate, reliable sealing performance, low power consumption, long service life, no need for frequent maintenance, and can meet the automation of production process and high temperature, low temperature, high pressure, high vacuum, high speed and various flammable, explosive, and corrosion Sealing Requirements for Sex, Abrasive, and Solid Particle Media.
Compared with packing seals, mechanical seals have the following advantages:
1. The seal is reliable, the sealing state is stable during long-term operation, the leakage is small, and the leakage amount is only about 1% of the packing seal;
2, long service life, generally up to 1-2 years or more in oil, water medium, generally can work more than six months in the chemical medium;
3, friction power consumption is low, the friction power is only 10-50% of the packing seal;
4, the shaft or sleeve is basically not worn;
5, long maintenance cycle, after the end of wear can be automatically compensated, under normal circumstances do not need regular maintenance;
6. Good anti-vibration performance, insensitive to the vibration, yaw of the rotating shaft and the deflection of the shaft to the sealed chamber;
7. Wide application range, can be used for high temperature, low temperature, high pressure, vacuum, different rotation frequency, as well as various corrosive media and seals with abrasive media.
Due to the above advantages of the mechanical seal, it has been widely used in stirring equipment.
Mechanical seals are available with single-end mechanical seals and double-end mechanical seals. Single-end mechanical seals are less expensive. When single-end mechanical seals do not meet requirements, double-end mechanical seals are required.
When the stirring media is highly toxic, flammable, explosive, or expensive high-purity materials, or need to operate in a high vacuum state, the sealing requirements are high, and the filler seal and mechanical seal can not be satisfied, can be used Closed magnetic drive.
The gears of the stirring equipment include motors, transmissions, couplings, bearings, frames, and the like. The stirring drive mechanism usually adopts a combination of a motor and a transmission or a motor with a frequency converter to achieve the required rotation speed.
The role of the transmission is to rotate the agitator shaft at the desired rotational speed and to ensure that the agitator shaft obtains the required torque. In most mixing equipment, there is only one agitator shaft and the agitator rotates in one direction at a constant speed. However, there are some special stirring devices. In order to obtain better mixing effect, two agitator shafts can be used in a stirring device, and the agitator can perform complicated movements such as reciprocating type, reciprocating type, and planetary type.
The stirring shaft of the stirring device is usually driven by an electric motor. Because the rotational speed of the stirring equipment is generally relatively low, the motor is used in combination with the transmission in most cases, and sometimes the inverter is used to directly adjust the speed. For this reason, when selecting the motor, special consideration should be given to matching with the transmission.
The stirrer, also known as the impeller or paddle, is the core component of the stirring apparatus. According to the flow pattern generated in the stirred tank of the stirrer, the stirrer can basically be divided into two kinds of axial flow and radial flow. For example, propeller impellers, new-type airfoil impellers and the like belong to axial flow agitators, and various straight blade and curve blade turbine impellers belong to radial flow agitators.
The stirrer is usually inserted into the kettle vertically from the center of the top of the stirrer, sometimes with a side insert, with the bottom extending in or laterally extending. Different installation methods should be selected according to different stirring requirements.
1 propeller type stirrer consists of 2 to 3 propeller blades (Fig. 2). The working speed is high, and the peripheral speed of the blade outer edge is generally 5-15m/s. The propeller stirrer mainly causes axial liquid flow and generates a large amount of circulation. It is suitable for stirring suspensions with low viscosity (<2 Pa·s) liquids, emulsions, and solids content less than 10%. The shaft of the stirrer can also be inserted into the tank horizontally or diagonally. At this time, the circulation loop of the liquid flow is asymmetric, which can increase the turbulence and prevent the depression of the liquid surface.
2 Turbine Stirrer consists of two to four flat or curved blades mounted on a horizontal disc (Figure 3). The ratio of the outer diameter, width and height of the blade is generally 20:5:4, and the circumferential speed is generally 3 to 8 m/s. The turbine generates a highly turbulent radial flow during rotation, which is suitable for the dispersion of gas and immiscible liquids and the liquid-liquid reaction process. The viscosity of the liquid being stirred generally does not exceed 25 Pa·s.
3 paddle stirrers There are flat paddles and inclined paddles. The flat paddle stirrer consists of two flat blades. The ratio of the blade diameter to the height is 4 to 10, and the peripheral speed is 1.5 to 3 m/s, resulting in a smaller radial flow velocity. The two blades of the oblique paddle stirrer (Fig. 4) are oppositely bent by 45° or 60° so that axial flow occurs. The paddle stirrer has a simple structure and is often used for the mixing of low-viscosity liquids and the dissolution and suspension of solid particles.
4 The shape of the outer edge of the anchor stirrer blade is the same as the inner wall of the mixing tank (Figure 5). There is only a small gap between them, which can remove the viscous reaction products attached to the tank wall or the solid substances accumulated on the bottom of the tank, and keep the same. Good heat transfer effect. The peripheral speed of the blade is 0.5~1.5m/s, which can be used to stir Newtonian fluids and pseudoplastic fluids with viscosity up to 200 Pa·s (see viscous fluid flow. When mixing high viscosity liquids, the liquid layer has large Stagnation area.
5 Ribbon Agitator The outside diameter of the ribbon is equal to the pitch (Fig. 6). It is specifically designed for stirring high-viscosity liquids (200-500 Pa·s) and pseudo-plastic fluids, usually operating in laminar flow.
6 Magnetic Stirrer The Corning Digital Heater features a closed circuit knob to monitor and adjust the stirrer speed. The microprocessor automatically adjusts motor power to suit water quality, viscous solutions, and semi-solid solutions.
7 Magnetic Heat Stirrers Corning Digital Heat Stirrers have an optional external temperature controller (Cat. No. 6795PR). They can also monitor and control the temperature in the vessel.  
Heating and cooling device
The unit is usually based on whether the material is heated or dried or cooled. In the custom range, the temperature should be less than 200°C and the use pressure should be less than 0.1Mpa. The heating method may depend on the production conditions of the unit of use. There are two kinds of heating methods, such as hot oil and other medium circulation and direct electric heating. Hot oil and other medium circulation is that the heat transfer oil is heated to a certain temperature in another heating tank, and then transported through the hot oil pump; the direct heating is directly installed on the jacket and the heating oil is heated to the required temperature ( The temperature can be adjusted according to the actual situation). The cooling cycle uses water to circulate inside and outside the jacket so that the material does not produce agglomerates or stickiness at a certain temperature. It can also be heated or cooled in the form of coils, etc. as required by the user.
(Note: The general use of heating or cooling media is to adopt the low tube mouth, the principle of high tube mouth) 
Standard operating procedure
Elimination of human-caused accidents and ensuring the normal operation of the equipment.
Scope of application
400L, 300L, 600L stirred tank.
1. The extraction operator should use and sanitize according to this regulation.
2. Maintenance personnel repair and maintenance according to this regulation.
3. The manager of the production management department is responsible for supervising the implementation of this regulation.
1 Check if the equipment is “normal” and confirm that the equipment is clean and meets the requirements.
2 Check whether the connection between the stirring paddle and the motor is firm and reliable.
3 According to the amount of liquid handled, the stirring tank is selected. The general liquid sample volume is not less than 1/3 of the mixing tank volume.
4 Slowly adjust the speed control knob (frequency converter) to increase the stirring speed slowly until it reaches the required speed. Speed range is 80–1400 r/min.
5 Turn the speed control knob to zero speed.
6 Add liquid and turn on the power switch.
7 After the device is used, turn off the power.
8 According to the “standard operating procedures for cleaning and disinfection of the mixing tank” for cleaning and disinfection.
9 Fill in the relevant records.
1 The distance between the stirrer rotor and the container should be noted. If it is a glass container, it should be noted that the stirring speed should not be too fast.
2 If you need to process the sample, you must first turn off the power switch, and adjust the speed knob to the minimum value, then repeat the above operation.
3 In the event of severe sparks, the machine must be shut down immediately for inspection and repaired to prevent further damage.
4 If the motor does not turn during use, check the power supply, governor, fuse, motor brush, etc. If the speed control section or the motor is damaged, notify the maintenance personnel to inspect.
Related document records
Equipment management procedures
2. Mixing tank cleaning and disinfection records
3. Mixing tank operation record table 
Installation and commissioning
1. Please check whether there is serious damage and serious deformation of the equipment during transportation, and check whether the fasteners of the equipment are loose!
2. Please use the embedded anchor bolts to install the equipment horizontally on a firm foundation.
3. Under the guidance of a professional, perform the correct installation of the equipment, electrical control devices, and accessories, and check whether the pipeline is unimpeded, whether the installed instrument is correct and whether there is any damage. Before starting the equipment, check whether the inside and outside of the equipment and its surroundings are There are people or objects that affect the normal operation of the equipment to avoid danger.
4. After installation, please conduct a trial run for a few seconds first to confirm that there is no electrical short-circuit or no abnormal sound before a short trial run.
5. If the stirring tank is equipped with a mechanical seal, an appropriate amount of 10# or sewing machine oil must be injected into the lubrication groove of the machine before the host starts. The cooling water must be introduced into the cooling chamber of the machine seal so that the sealing device can be well Lubrication and cooling. The machine seal is not adjusted at the factory. After installation, adjust the machine seal to the best position according to the installation and operation instructions before operating normally (according to the user’s needs).
6, after the normal operation of the equipment, please check the bearing temperature, smooth running, sealing, etc., and whether the instrument is normal, after the normal operation can be charged. 
1. This equipment is atmospheric pressure equipment. If the heat exchanger is unblocked, it is also regarded as normal pressure. If the pressure is high, please check whether the import and export are blocked.
2. The speed reducer shall be equipped with 40#–50# oil or 70#–90# extreme pressure industrial gear oil. After the first operation for 20 days (8 hours of work per day), replace the oil and clean the oil in the fuel tank. Change every 3 to 5 months and clean the tank. (except without reducer)
3, if equipped with a condenser, according to the effect of heat transfer to determine whether to clean the heat transfer pipe.
4. The load in the mixing tank should be strictly in accordance with the effective volume of the mixing tank body. It is strictly prohibited to use it overloaded so as not to burn the motor or damage the speed reducer and other components.
5. If the equipment is not used for a long time, it should be completely cleaned. Lubricating oil should be injected and the power should be cut off. 
Applicable materials Under a certain pressure, mechanical stirring of flammable, explosive, toxic, odorous materials and other dissolved, sterilized, fermentation process requires a long time constant pressure operation equipment. It is more suitable for bioengineering equipment that does not allow any trace leakage and contamination in the production process. 
Stainless Steel Magnetic Agitator Mixing Tank
Magnetic Agitator Mixing Tank, the bottom of the magnetic stirring device in the bottom of the tank, belongs to the aseptic tank.Magnetic stirring tank and tank with different head structure form, the tank can jacketed form or combination of single root tree different requirements;Configuration magnetic stirring bottom or side into the type, can achieve the CIP and SIP.
Tank Optional Configuration
Magnetic agitator mixing tank can configure aseptic air filter, thermometer(Digital display or Dial type), PH meter, pressure gauge, steam sterilization hole, sight glasses, sanitary manhole, liquid in-outlet, CIP cleaning ball, liquidometer and Liquid level control system(Bearing module, non-contact ultrasonic, static pressure transmitting device) and so on, also can configure as customers’ requirement.
• Can be used as storage Tank, mixing tank, temporary Storage Tank, mixing tank, etc., Used in liquid materials’ mixing and storage such as food, dairy products, fruit juice beverage, pharmaceutical, chemical and biological engineering.
• Welding die static sealing of sleeve to replace dynamic mechanical seal, completely solve the problem of dynamic mechanical seal leakage, so there is no leakage, no external pollution, safety and simple structure, easy disassembly, easy to clean, no dead corner.
• At the bottom of the device, in the case of less material can be stirring, mixing blade design is unique, appropriate mixing work speed of 20 r/min to 400 r/min, can adapt to all kinds of different material mixing,
• Stirring speed adjust by frequency converter, to meet the requirements of the various process of stirring speed.
• Volume 50 l ~ 20000 l, and other specifications, according to the actual needs of customers.
According to customers’ requirement（0℃～160℃）
Rock wool or PU
Mechanical polishing, electrolytic polishing, sand blasting, pickling
Inner surface Ra≤0.3μm，
Normal Model And Main Technical Parameters
|RPM：r/min||20～400（The design can be adjusted according to customer use condition）|
The above-mentioned data is the standard, for reference only.It can customize according to customer’s requirements.
Source: China Mixing Tanks Manufacturer – www.secmachinery.com
www.secmachinery.com is one of the leading China filtration equipment & sanitary stainless steel pressure vessels manufacturer, with a professional factory. We focus on the sanitary pressure vessels, filtration equipment research, and development, manufacturing, sales and service since the company been established. Our products are widely used in biopharmaceutical, food and beverage, fine chemical industry.
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