The recycling of waste rubber-crushing
The waste rubber like tire is crushed or ground into particles by mechanical method; The so-called recycled rubber is made by destroying the chemical network structure of vulcanized rubber through desulfurization technology.
The method of crushing rubber powder is as follows:
1. After pretreatment of waste rubber, waste rubber products generally have non-rubber skeleton materials such as fibers and metals, Therefore, before crushing, waste rubber must be pre-treated, including sorting, removal, cutting, cleaning and other processing. The waste rubber should also be inspected and classified, and the waste rubber and its products of different categories and different sources should be classified according to the requirements. For larger products such as waste tires, the tire head should be removed, and the tread separator should also be used to separate the tread from the body. Rubber shoes are mainly recycled soles, and the inner tube should be removed from the valve mouth. After separation, the non-rubber components in the waste rubber are removed. Because of the different lengths and uneven thickness, the waste rubber can not be directly crushed and must be cut. For example, the tire is cut into 25MMX25MM rubber blocks by the cutting equipment with the special industrial knife for rubber.
2. Freezing crushing method.
There are two kinds of freezing grinding process: one is the low temperature freezing grinding process. The other is the combined grinding process of low temperature and normal temperature. The former uses liquid nitrogen as a cooling medium. After deep cooling, the waste rubber is broken at low temperatures with a hammer crusher or roll crusher. The waste tire was processed into fine rubber powder by liquid nitrogen cryogenic technology. The temperature, speed and overload in the production process are controlled by closed-loop chain microcomputer, which is pollution-free to the environment. The entire production process of the production line uses compressed air as the power of the feeder, closed pipeline transmission, in addition to waste tire input and product packaging and air contact, the whole line is closed. And through the heat exchange process of fine rubber powder and coarse powder, the purpose of making full use of energy, reducing energy consumption and reducing product cost is achieved.
Crush at room temperature. Waste rubber is crushed at room temperature after pretreatment, generally divided into coarse and fine two kinds.
Coarse crushing and fine crushing at the same time: the operation of two rollers, one surface with grooves, the other surface without grooves, that is, groove polishing roller machine. First of all, the rubber block after washing is sent between two rollers through the conveyor belt for crushing, and then the crushed rubber block and rubber powder fall into the reciprocating screen at the bottom of the equipment for screening, after reaching the size requirements of the screening, through the conveyor into the warehouse; The rubber blocks that do not meet the requirements are crushed by rotation and then enter the groove roller.
Coarse crushing and fine crushing are carried out on two kinds of equipment respectively: coarse crushing is carried out on the groove roller with grooves on the surface of the two rolls, and the size of the coarse crushing rubber block is generally 6-8MM. Then fine crushing process, final particle size is generally 0.8-1.0MM.
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