To ensure that the PVC high-speed mixer delivers its intended mechanical performance during production, improper operation must be avoided as it may cause hazardous situations, personal injury, or equipment damage. Please follow the correct operating procedures and read the product manual carefully before startup.
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1. Applications of the PVC High-Speed Mixer
The SHR series PVC high-speed mixer is primarily used for mixing, drying, coloring, and blending of materials in the plastics, building materials, rubber, food, pharmaceutical, fuel, terpolymer, daily chemical, and other industries.
The high-speed mixer offers technical advantages such as reliable quality, durability, convenient operation, and a rational structure, meeting the requirements of material mixing production processes. With variable frequency speed regulation, it can save 15%–20% on electricity, making it an ideal mixing solution.
2. Main Structural Description of the PVC High-Speed Mixer
The PVC high-speed mixer consists of six parts: frame, drive unit, mixing vessel, lifting mechanism, discharge port, and electrical control box. The entire machine adopts a closed structure, which is rational and aesthetically pleasing.
The mixing vessel is made of stainless steel. Its inner surface is very smooth and hard, offering wear resistance, corrosion resistance, and non-stick properties. The vessel is equipped with a heating jacket and resistance heating elements. Heat is transferred to the vessel via high-flash-point heat transfer oil in the heating jacket, ensuring even heating. The temperature inside the vessel can be controlled by adjusting the thermostat.
The mixing vessel of this series is made of aluminum alloy casting. The inner surface is finished by turning and polishing. The vessel tilts horizontally and rotates clockwise along the vertical direction (rotation angle of approximately 70 degrees). The lid opens to allow resin, plasticizer, and stabilizer to enter through the hopper and air vents, which users can arrange according to their needs.
The rotation of the vessel cover should not be too forceful to prevent damage to the vessel wall. To prevent personal injury when the cover is open and the mixing paddle is rotating, the motor is equipped with a special protection circuit.
The guide plate in the PVC high-speed mixer enhances the mixing effect. The guide plate has a streamlined surface and affects material flow circulation. Its position will influence mixing performance. The guide plate is welded at different positions inside the vessel depending on the material being processed.
The thermocouple is installed at the center of the mixing barrel. Its cable is routed through a conduit to the terminal block. When connected to the temperature meter on the electrical control box, the material temperature can be read on the display, which is used to automatically control the discharge port.
PVC High-Speed Mixer Video:
The mixing paddle of the PVC high-speed mixer is driven by the motor through V-belts. The motor can be an AC two-speed motor or a three-phase asynchronous single-speed motor. You only need to press the low-speed and high-speed buttons to achieve low or high-speed operation. However, note that when high speed is required, the motor should be started at low speed first and then switched to high speed.
The main shaft is supported by two or three deep groove bearings (depending on the model). The upper main shaft carries two or three mixing blades. It rotates clockwise, moving material along the vessel wall while simultaneously pushing it upward. Combined with the action of the guide plate, the mixing effect is improved.
Because the material rotates at high speed, friction between materials and between the material and blades generates significant heat, causing the material temperature to rise rapidly. This not only reduces the heat that needs to be added through the vessel wall but also enhances resin absorption of plasticizer.
The mixing blade is made of stainless steel casting, processed through mechanical finishing, dynamic balancing, and polishing. It is resistant to acid and alkali corrosion.
The discharge section is made of aluminum alloy casting, each equipped with a pneumatic discharge valve. The cylinder connects to the discharge door via a linkage, providing compact and reliable sealing with flexible opening and closing. It requires an air compressor (provided by the user) delivering 0.39–0.49 MPa.
The discharge method can be automatic (controlled by vessel temperature) or manual (using buttons to open and close the door). A hose nozzle with a blow-off head is installed on the discharge port cover plate fixed to the machine base. This is used to blow off mixed material adhering to the discharge port, preventing residual material from causing incomplete valve closure.
3. Installation, Use, and Maintenance of the PVC High-Speed Mixer
The PVC high-speed mixer is supplied as an assembled unit and should be installed on a cement foundation or a rigid steel frame foundation. Assembly and installation steps are as follows:
1. Calibrate levelness.
2. Align the position and secure it with four M16 bolts.
3. The mixing model of this series generally uses resistance heating sheets, which heat the heat transfer oil in the jacket to evenly transfer heat to the vessel. Installation of the electrical control box should be arranged by the user according to actual usage conditions.
4. Before commissioning, carefully check that the power supply and air source meet the machine’s requirements. Check that all parts and fasteners are completely and securely installed. Verify that no circuit connectors are loose or disconnected. Check that the frame and anchor bolts are fastened. Ensure the vessel is free of debris and loose parts. Confirm that all lubrication points are lubricated according to specifications. Wipe the machine clean of dust and rust-preventive oil.
5. For commissioning, first perform a no-load run at low speed, check the rotation direction, then stop and confirm the direction matches the machine’s brand mark. After confirming correct direction, perform idle testing. During testing, run at low speed first, then after stable operation, run at high speed. Simultaneously, check that the vessel cover safety mechanism and pneumatic components are functioning normally. After test running, begin feeding.
6. After using the machine, if it will not be used for a short period, clean the inside of the vessel and the mixing blade. If it will not be used for a long period, coat with rust-preventive oil.
7. The high-speed mixer is driven by V-belts. When replacing V-belts, pay attention to proper belt tension. Do not over-tighten, otherwise the deep groove ball bearings of the transmission components may be damaged.
8. The main shaft of the mixer should be lubricated once per day with No. 4 lithium grease or high-temperature grease (GB492-89).
9. The entire machine should be overhauled once every six months. Sealing parts should be replaced, and electrical circuits and components should be inspected.
4. Precautions for the PVC High-Speed Mixer
1. When using electric heating at the upper interface of the mixer, the threaded holes must not be blocked to allow for oil temperature and air permeability.
2. This series of mixers must not be started under load nor started frequently. For hot mixing, start at low speed, then switch to high speed, and then begin feeding.
3. When opening the lid, first remove the fastening handles and connecting ports (generally three handles) to prevent damage to the lid.
5. Electrical Protection and Control of the PVC High-Speed Mixer
1. The electrical control cabinet adopts a vertical structure and is equipped with various control and display components. To prevent system damage due to wiring errors, mechanical overload, short circuits, and other faults, the system is equipped with multiple protection measures. The operation of each component is controlled via buttons on the control panel.
2. This series of high-speed mixers mainly performs four main functions: motor operation control, feeding control, vessel cover opening, and heating control.
2A. Motor Control: The motor is directly controlled by buttons. The motor starts at low speed first, runs normally, and then can be switched to high speed.
2B. Feeding Control: The material temperature is raised primarily through internal friction between material particles and friction between the material and the vessel body to achieve heating. Automatic feeding is controlled by the temperature controller. When the material temperature reaches the set value, the feed opens and then closes after a delay. For manual feeding, two buttons control the opening and closing of the feed door. The automatic/manual knob switch on the operation panel selects the corresponding mode.
2C. Vessel Lid Control: After the motor stops, two buttons control the opening and closing of the lid. When the lid is open, the motor will not start.
2D. Heating Control: Four heating elements are installed on the outside of the main vessel to heat the heat transfer oil in the vessel’s interlayer. The oil temperature is controlled and displayed by the temperature controller.
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