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Cold crushing with two crushing methods
The cryogenic comminution is the use of liquid nitrogen freezing, so that the waste rubber products are cooled to below the glass transition temperature, and then crushed with a hammer mill or a roller mill. There are two methods for cryogenic comminution, namely direct cryogenic cryogenic comminution and cryogenic comminution with coarse crushed and then finely crushed under freezing conditions.
Direct freezing cryogenic grinding method. The production process of this grinding method is to cut the bead portion of the tire on a tire dissecting machine, and at the same time, divide the tread into 2 to 3 pieces and place it in a freezing (liquid nitrogen) device, and then use a hammer or a roller. The crusher pulverizes to obtain a powder.
Under cryogenic conditions, coarsely crushing and then crushing by cryogenic comminution. The production process of the crushing method is as follows: After the used tires are cut, they are placed in the freezing device, and then they are coarsely crushed in the hammer or roller crusher, and then they are broken again after being coarsely crushed and then crushed to obtain the rubber powder. This production method requires two liquid nitrogen freezings, so the production cost is higher. However, when the steel radial tire is treated by this method, the steel wire is easily separated from the rubber, and the power consumption can be reduced accordingly.
It is reported that the air-cooled cryogenic pulverizer will generate high temperatures during high-speed operation. When crushing the heat-sensitive materials, it will deteriorate due to high temperatures. Therefore, the pulverizer needs to be cooled, and Jiangyin Shengling Machinery Manufacturing Co., Ltd. researches and develops production. The wf-30 air-cooled cryogenic crusher uses a cold air blower to inject cold air into the crushing silo to achieve a cooling effect (adjustable air-conditioning temperature) so that the material will not deteriorate due to high temperatures. The material is crushed to the desired fineness in the pulverizer (particle size can be adjusted by changing the screen). The product can be widely used in the pulverization of pharmaceutical, food, chemical, national defense scientific research and other industries, especially heat-sensitive substances and materials that cannot be crushed.
Low-temperature crushing process has an irreplaceable role
The cryogenic comminution technology is not a new technology. It was already industrialized as early as 1948. It has a long research history in the recycling of waste rubber, plastics, food, and pharmaceuticals, and it has relatively mature technologies and processes to carry out cryogenic comminution. Process research is necessary and meaningful. It is reported that the cryogenic crushing process has several advantages.
1. It is most suitable for crushing substances that cannot be crushed at room temperature, such as rubber, thermoplastics, etc.
2. The built-in classifier can get obvious particle size distribution powder material;
3, the more fine-grained, more fluid powder can be obtained by crushing at normal temperature, and the pulverized powder has good moldability;
4, to avoid dust explosion, odor pollution and noise;
5, the power needed for crushing is very low, which can increase the output of the crusher;
6, crushed heat-sensitive material will not be subject to oxidation and heat and deterioration;
7, the use of a variety of materials, the difference in low temperature brittleness, for the selective comminution of complex materials, such as rubber, metal and fiber tires.
As a high-elastic material at room temperature, a high-molecular-weight rubber can be made brittle by lowering the temperature, and can be pulverized in a pulverizer maintained at a low temperature to obtain a desired pulverization effect, which cannot be replaced by other pulverization methods.
The author was informed that Shandong Linqing Xinyuan Pharmaceutical Machinery Co., Ltd. developed and produced a large-scale cryogenic pulverizer unit using liquid nitrogen as a cold source. The pulverized material was cooled at a low temperature to achieve embrittlement. After being crushed, it entered the mechanical pulverizer chamber and passed through the impeller at high speed. Rotation, material and blade, tooth plate, materials and materials between the repeated impact, collision, shear, friction and other comprehensive effects, to achieve the effect of crushing, most of the air-conditioned recycling back to the silo. The whole machine of the machine is completely controlled by the PLC microcomputer. When the material is crushed, the current balances the ideal state. At the same time, the function of smashing the material temperature display can be observed, and complete linkage automation can be realized.
Low-temperature crushing plays an important role in the crushing process of traditional Chinese medicines, such as non-pollution. The temperature of crushing chambers in the crushing process of such equipment is generally below zero and is in a non-pollution state; the scope of application is wide, regardless of material, regardless of material The composition and nature of the pulverizer can meet the pharmaceutical process requirements. However, the low-temperature crusher also has low cost due to high crushing costs.
The JCWF-25L ultra-low temperature ultrafine crusher developed and produced by Jinan Juncheng Machinery Equipment Co., Ltd. adopts ultra-low temperature crushing technology. At the same time, the crushing method adopts a cooling method to keep the crushing process within the required temperature range, which can ensure that the aromatic components are not easily lost, but also The softened or sticky drug after warming up is easily crushed. The average particle size of Chinese medicine micropowder is generally below 10um, its uniformity is improved, the color is uniform, and the powder is delicate. The use of micropowder technology can make the active ingredients in the medicine better exposed, and no longer need the previous transmural membrane release, so that the drug can play a more rapid role. Using ultra-low temperature technology can also prevent the volatilization of highly volatile components and the loss of active ingredients.
The cryogenic crusher cannot be replaced in the pharmaceutical process
The temperature crushing method mainly includes a low-temperature crushing process and a crushing process coexisting with a low temperature at room temperature. It is reported that the low-temperature pulverization refers to a process in which substances cooled to the temperature of the embrittlement point are broken into particles or powders with smaller particle diameters under the action of external forces. The cryogenic pulverization technology can ensure that the crushed material, such as the natural product, is free from damage to the tissue components during the pulverization process.