Grinding equipment for preparing granule dispersion

Abstract

The invention discloses grinding equipment for preparing granule dispersion. The grinding equipment comprises a feed inlet, a discharge outlet, a rotary shaft, a grinding cylinder, a grinding cavity,stirring blades, a first separator, a second separator, a return pipe and the like. The grinding equipment has the advantages that the tail end of the rotary shaft and the rear end cover of the grinding cylinder are designed into a conical shape, the return pipe is arranged on the grinding cylinder, and accordingly qualified materials can be fast discharged from the discharge outlet through vortex motion and physical squeezing, unqualified materials can be squeezed to the return pipe, and blocking is avoided while the work efficiency of the grinding equipment is increased; in addition, the stirring blades on the rotary shaft are set into at least two different lengths, so that the whole grinding cavity near the rotary shaft is located in an effective area and can squeeze, crash, rub and shear the materials, the effective grinding area is expanded, and dispersing effect and grinding efficiency are increased.

Description

technical field [0001] The invention relates to a grinding device, in particular to a grinding device for preparing particle dispersion, and belongs to the technical field of grinding machinery and equipment. Background technique [0002] The slurry formed by stably dispersing solid particles such as pigments and fillers in the liquid phase carrier is a common raw material in the fields of coatings and papermaking. In order to disperse the solid particles well in the liquid phase, they are usually dispersed and ground by grinding equipment. The working principle of the grinding equipment is to use the high-speed rotating shaft to drive the stirring blades to rotate, and then drive the grinding media such as zirconium beads, glass beads, and Ottawa sand to rotate at high speed to make them squeeze, collide, rub, and shear each other to achieve The purpose of grinding fine particles and dispersing aggregates is to reduce the size of the particles, disperse and mix the materia...

AI Technical Summary

Problems solved by technology

During the grinding process, large particles formed due to problems such as low grinding efficiency and agglomeration of large particles cannot pass through the filter separation device at the outlet of the grinding equipment, and large particles tend to accumulate on the filter separation device at the outlet, causing grinding equipment during the production process. When the outlet is blocked, the pressure in the grinding chamber will increase sharply with the slurry pumping input at the entrance of the grinding chamber, causing the grinding equipment to stop production due to excessive pressure in the chamber

One way to solve the clogging of the grinding equipment is to frequently clean or replace the sieve of the filter. This method needs to interrupt the grinding equipment when cleaning or replacing the filter, prolonging the downtime and affecting work efficiency; another common method to solve the clogging of the grinding equipment The method is to adopt multiple grinding steps in series, large particles use large grinding media, and each subsequent grinding operation uses smaller grinding media to gradually reduce the particle size of the grinding particles in each grinding step, for example, the patent US5524830 discloses A method of separating grinding chambers through slits, patent CN201420050018.8 discloses a method of using screens to separate grinding chambers, but this method and similar methods require the use of multiple grinding chambers, which are expensive and time-consuming

[0004] Due to the centrifugal force, the commonly used grinding equipment can effectively pulverize the material in the outer ring area of ​​the grinding chamber, that is, the high energy density area, but a small amount of material around the rotating shaft cannot be fully and effectively pulverized, and even the material will adhere to the rotating shaft. The above situation, and the effective area of ​​the grinding chamber is small, resulting in poor dispersion and low grinding efficiency

Patent CN201510623224.2 discloses a method of evenly distributing several dispersing disk brackets around the rotating shaft, which solves the problem that the materials around the rotating shaft cannot be crushed quickly, but the structure of the grinding equipment is complicated, and the manufacturing cost and maintenance cost are high

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