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With China Plastic Machinery
With China Plastic Machinery
Plastic mixer is also a kind of plastic machinery. SHR series mixer is mainly used for mixing and coloring polyvinyl chloride resin, coloring and drying of polyethylene and polypropylene particles, drying of hygroscopic resins such as ABS and polycarbonate resin before molding, mixing of phenolic resin and other processes. It is one of the necessary equipment for plastic processing plants and is also widely used in rubber, pharmaceutical, dye and other industries.
Due to its advantages of fast mixing, uniform mixture, good absorption of plasticizer by resin, simple machine operation, easy cleaning, sturdy and durable, compact structure, etc., it is widely used in the production of various plastic industries.
It consists of pot body, pot cover, transmission parts, base, discharge port and other parts. The pot body is welded from stainless steel, and the inner surface is extremely smooth and hard, with the characteristics of wear resistance, corrosion resistance, and not easy to stick. There are heating jackets and resistance heating rings on the outer surface of the pot body. The temperature is directly transferred to the pot body through the high-ignition-point mechanical oil in the heating jacket, so that the pot body is heated evenly. The temperature of the material in the pot can be controlled by adjusting the heating temperature. The outer jacket is wrapped with an asbestos insulation layer.
The pot cover is cast from aluminum alloy, and the inner surface is fine-turned and polished. It can be rotated 70бу clockwise along the vertical axis, but do not rotate too hard to prevent the pot wall from being damaged. There are holes for adding resin, plasticizer, and stabilizer on the cover, which can be arranged by the user according to their needs. The center is a vent. In order to prevent personal accidents caused by the rotation of the stirring paddle when the pot cover is not covered properly, a safety limit switch is installed on the pot body. When the pot cover is not covered tightly, the switch is not turned on and the motor cannot be started.
The guide plate is used to enhance the mixing effect, and its guide angle can be freely adjusted. A temperature measuring thermocouple is installed in the plate, and the material temperature can be reflected on the indicator and read out, and it is also used to automatically control the automatic discharge of the discharge port.
The stirring paddle of the mixer is driven by a motor through a belt. The motor is an AC two-speed motor. As long as the start button is pressed, it can be operated. The main shaft is supported by 312 and 314 bearings. There are three stirring paddles on the upper part of the main shaft. They run in a clockwise direction, so that the material moves along the pot wall on the one hand, and circulates up and down at the same time. In addition, the function of the guide plate makes the mixing effect better. Because the material moves at a high speed, the friction heat between the particles and between the material and the paddle is very large, which makes the material temperature rise rapidly, not only reducing the heating amount of the pot wall accordingly, but also conducive to the absorption effect of the resin on the plasticizer. The stirring paddle is made of stainless steel and is carefully machined. It is wear-resistant and corrosion-resistant.
The base is cast iron with four hanging rings on it. The seat is a transmission belt and two pulleys. The belt can be replaced by opening the plates on both sides. There are four anchor bolt holes at the bottom of the seat.
The discharge port is cast from high-quality iron plate and is equipped with a manual discharge door, which is reliable in compression, good in sealing, and flexible in opening and closing. The discharge method can be manually controlled to open and close the discharge door.
The mixer and the electric control box are installed on a cement foundation or a solid steel frame foundation, respectively, and fixed with four anchor bolts.
The mixer is heated by a resistance heating coil, which is evenly transferred to the pot body through the high-ignition-point mechanical oil in the heating jacket, and the power cord is connected through the underground wire protection pipe. It is very convenient to use four lifting rings to lift the machine. The installation dimensions and fixing bolts can be seen in the installation foundation diagram.
Before the machine is tested, carefully check whether the connected power supply is consistent with the requirements of the machine. All parts are fully installed, and the circuits connected during installation are checked according to the circuit diagram. Each lubrication point should be filled with the specified lubricating oil (grease), and the anti-rust oil in various parts of the machine should be wiped clean.
The mixer should start from no-load, then carry out load test, and check whether the pneumatic part is normal, and whether the discharge door is opened and closed properly. After the test run, it can be put into production. Once the machine is used, if it is not used for a short time, the inner wall of the pot and the stirring paddle should be carefully wiped clean. When it is not used for a long time, it should be coated with anti-rust oil. Requirements for each lubrication point: The main shaft of the mixer is lubricated with No. 2 sodium-based grease (GB492-65), and refueled once a day. The whole machine should be overhauled once every six months, and the seals in various places should be replaced, and the electrical circuits and components should be checked. Note: 1. When the upper interface is used for electric heating, the screw hole should not be blocked to facilitate ventilation. 2. The machine is not allowed to start with load. Start at low speed and no load first, and then add materials to the feeder.
The visual detection method is a qualitative visual method. When judging the dispersion of carbon black, the dispersion level of carbon black is evaluated by comparing the observed sample cut with a set of standard photos, and the result is expressed as a numerical value. This is a method recommended by the American Society for Testing and Material (ASTM).
The specific method is: tear or cut the mixture sample (some need to be properly processed) to expose its fresh surface, observe it with the naked eye, preferably under a magnifying glass or low-power binocular microscope, compare the dispersion of carbon black with a set of 5 standard photos, and then evaluate its level. Therefore, this method is also called the comparative sample method. The visual dispersion level is related to some important physical properties of the mixture. This method is divided into 5 levels when evaluating the dispersion level of carbon black. When the level is 5, it means that such a dispersion state makes these physical properties closest, while the mixing state at the level of 1 makes these properties significantly reduced.
The agglomeration counting method relies on the percentage of the area occupied by carbon black agglomerates in the mixture slice under an optical microscope to evaluate the dispersion degree of the mixture. Since this method involves direct measurement, it is a quantitative determination, which is more accurate than the visual observation method and is also a method adopted by ASTM.
The specific method is: cut the mixture into thin enough slices, and after certain treatment, place it under transmitted light, and observe the carbon black agglomerates therein through an optical microscope. The magnification of the optical microscope is between 75 and 100 times. The eyepiece used for counting contains a 1cm2 grid divided into 10,000 small squares. Calculate the area occupied by all carbon black agglomerates that are not less than 5ж╠m. Based on the known carbon black content in the material, the percentage of carbon black agglomerates with a size of 5ж╠m can be calculated, expressed as "carbon black dispersion percentage". Optical microscopy and electron microscopy are commonly used qualitative methods for directly observing the morphological structure of the mixture. There are many other methods to directly determine the mixing state, such as the photoelectric method. The principle is: a 40um sample slice made of a mixture of LDPE and carbon black is processed and scanned under a microphotometer. Due to the uneven size and distribution of carbon black micelles, the intensity of the light transmitted is different.
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