A method for preparing waste tire fine rubber powder production line

Abstract

The invention relates to the technical field of resource recycling comprehensive utilization, in particular to a using method of a production line for preparing junked tire fine rubber powder. The using method is characterized in that a driving grinding grate assembly and a driven grinding roller assembly are designed to complete the grinding technological process by combining the advantages of a movable-fixed tool and a movable-movable tool, and water vapor is used for completing the technological processes of conveying, sterilization, separation, sorting, protection and the like in the production process of the junked tire fine rubber powder; the water vapor is used as a pneumatic transmission carrier of the junked tire fine rubber powder, and compared with the modes of mechanical conveying and the like, the advantages of reducing cost, saving energy, achieving automation and relieving labor intensity are achieved; and the water vapor serves as a sterilization medium of the junked tire fine rubber powder, microbial cells can be effectively killed, reproducing growth can be restrained, the phenomenon that microbial strains are decomposed into small-molecular-weight combustibles through fermentation and metabolism is avoided, the firefighting safety level is increased, and the problem of spontaneous combustion caused by storage of rubber powder sediments at a normal temperature is solved.

Description

technical field [0001] The invention relates to the technical field of resource recycling and comprehensive utilization, in particular to a method for preparing a waste tire fine rubber powder production line. Background technique [0002] At present, one of the recycling and comprehensive utilization methods of waste tire rubber is to prepare fine rubber powder. The fine rubber powder of waste tires (38-40 mesh) can be used as the main raw material of high-quality tire regenerated rubber. The fine rubber powder of waste tires (60-100 mesh) It is an important additive. Adding it to general rubber products can replace raw rubber up to 90%, and at the same time can improve the aging resistance of rubber products. Also in the formula of tire products, 60 mesh waste tire fine rubber powder can replace 10 ~20% of the original rubber can also improve its wear resistance, prolong the service life of the tire, and greatly reduce the cost of the tire. The vulcanized tire rubber has ...

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Problems solved by technology

[0003] The technical solution proposed in prior art 1 is to use more than four kinds of cutting tools (crushing blades in the feed port, grinding plates, grinding rollers, grinding discs, grinding rings) to crush and sieve through sieves to produce rubber powder. Disadvantages of the method for sorting rubber powder are high energy consumption (vibrating sieve), easy blockage of sieve holes and low sorting efficiency, and the setting of multiple crushing also proves the problem of low sorting efficiency. The crushed and qualified rubber powder cannot be sorted On the one hand, it will increase the energy consumption, and on the other hand, it will reduce the quality of the rubber powder. It can be found from the observation of the rubber powder particles under the microscope that there are many short branch bundles on the surface of the rubber powder crushed by mechanical shearing, which can be used as substitutes for the original rubber. When fillers are used, these short branch bundles can be well entangled and grafted with rubber molecular chains. However, during repeated mechanical processing, the rubber powder will be scorched and carbonized due to frictional heat generation and the rubber will be vulcanized. The problem of quality index decline; the existing technology 2 adopts screw extrusion (auger) to transport waste tire blocks into the grinding head for mechanical crushing. The grinding head is composed of a moving grinding head and a fixed grinding head. This technical solution is the largest The defect is how to solve the problem that the frictional heat generated by the rubber powder is not cooled well, and the scorching and carbonization of the rubber powder will reduce the performance of the rubber. Since the rubber powder of 20-120 meshes needs to be processed, the gap between the movable grinding head and the fixed grinding head is very small, and the waste The tire block cannot enter, and has to be forced in by screw extrusion. During the grinding process, the rubber powder will inevitably accumulate a large amount of heat and cannot be cooled. Therefore, the comparative document 2 uses two methods of circulating water cooling and air cooling in the grinding head to try to cool down. However, it is difficult to achieve the cooling effect by these two methods. Due to the low thermal conductivity of rubber, the way of heat conduction through water-grinding-rubber particles, and the limited heat exchange area, the cooling technology scheme of circulating water in the grinding head has a relatively low heat exchange efficiency. Low, unable to take away the large amount of heat accumulated by the friction of rubber powder and the shearing process of the grinding head in time; the technical solution of air cooling cannot form convection due to the sealing of the auger and the grinding head The air induction system only plays the role of automatic hair suction)

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