A production line for preparing fine rubber powder from waste tires

Abstract

The invention relates to the technical field of recycling and comprehensive utilization of resource, in particular to a production line for preparing used-tire fine rubber powder. The production line is characterized by comprising a distributing groove component, a separator component, a grinding component, a classifier component, a plenum pulse bag gathering component, a spiral stair blade separating component and a rotary table component. The way that the technological process of conveying, sterilization, separation, separation, protection, etc. in the production process of used-tire fine rubber powder is completed by water vapor is ideal. Compared with mechanical conveying, the water vapor as a pneumatic conveying carrier of used-tire fine rubber powder has the advantages of reducing the cost, saving energy, realizing automation and reducing labor intensity. The water vapor as a sterilization medium of used-tire fine rubber powder can effectively kill microorganisms, inhibit reproduction and growth of the microorganisms, and avoid microbial bacterial fermentation and metabolism so as not to decompose out small molecular weight of combustible matters. The safety level of fire protection is improved, and the problem of spontaneous combustion of rubber dust accumulators during storage at 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 production line for preparing fine rubber powder from waste tires. 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 the...

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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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