Steam protection mill for preparing waste tire fine rubber powder

Abstract

The invention relates to the technical field of cyclic and comprehensive utilization of resources, in particular to a steam protection mill for preparing waste tire fine rubber powder. The steam protection mill is characterized by comprising a distribution groove assembly, a separator assembly and a grinding assembly. By combining advantages of two types of cutting tools including a movable-fixed cutting tool and a movable-movable cutting tool in the prior art, a driving milling grate assembly and a driven milling roller assembly designed; the driving milling grate assembly is a movable cutter and the driven milling roller assembly is a fixed cutter; the driven milling roller assembly comprises three groups of milling rollers which form 120-degree included angles with the plane; in a working process, the driving milling grate assembly rotates and a friction force generated by cutting waste tire rubber drives the three groups of milling rollers to rotate, and working conditions including mutual cutting of working surfaces, namely milling discs, of the three groups of milling rollers, and mutual cutting of the milling discs and a working surface, namely a milling bowl, and a tapered grate in the driving milling grate assembly occur, so that the problems of working efficiency and in-time sorting are solved. A production process of the waste tire rubber powder is carried out in a closed device and steam is used as a medium for finishing a production technological process including rubber powder conveying, protection, heat insulation, sorting, separation and the like.

Description

technical field [0001] The invention relates to the technical field of resource recycling and comprehensive utilization, in particular to a steam protection mill for preparing waste tire fine rubber powder. Background technique [0002] At present, one of the recycling and comprehensive utilization methods of waste tire rubber is to prepare fine rubber powder. Waste tire fine rubber powder (38-40 mesh) can be used as the main raw material for high-quality tire regenerated rubber. Waste tire fine rubber powder (60-100 mesh) It is an important additive, which can replace the original rubber up to 90% when added to general rubber products, and can improve the aging resistance of rubber products at the same time. Also in the formula of tire products, 60-mesh waste tire fine rubber powder can replace 10-20% of the original rubber, which 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 ...

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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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