Hulling separation method for rapeseeds and special separation device

Abstract

The invention discloses a hulling separation method for rapeseeds. The hulling separation method comprises the following steps of cleaning rapeseed raw materials to remove sand and vegetation impurities to enable the impurity content to be less than or equal to 2 percent; then performing drying at the drying temperature of 160 DEG C, wherein the water content of the dried rapeseeds is 5-8 percent; cooling the rapeseeds to normal temperature, performing magnetic separation to remove metal impurities, conveying the rapeseeds into a rapeseed huller for shearing, grinding and extruding to obtain hull and kernel mixtures, and then conveying the mixtures into a separation sieve in a special separation device, wherein under the joint action of a vibration sieve and a fan, the upper layer of hulls with small density are removed through the fan, and the lower layer of seeds with large density are discharged through a front port of the special separation device and are collected. The hulling separation method has the advantages that the hulling rate is high, the primary hulling separation rate can be up to 98 percent, and the hulling effect is good; the proportion of naturally split half kernels to integrated kernels is up to about 75 percent; the powder rate is lower than 3 percent; the kernel and hull separation efficiency is high; the phenomenon that the kernels and the hulls are adhered is avoided.

Description

technical field [0001] The invention relates to the production of rapeseed oil, in particular to a method for dehulling and separating rapeseeds before the rapeseed oil is pressed, and the invention also provides a special separation device used in the method. Background technique [0002] Rapeseed oil, like peanut oil, is a traditional edible vegetable oil in my country. Ripe rapeseeds are spherical in shape, and some are also irregularly rhombus-shaped. Rapeseed is mainly composed of two parts, the seed coat and the seed kernel. The seed coat accounts for about 12%-20% of the total amount of rapeseed. The difference in the thickness of the seed coat is related to the variety of rapeseed and the color of the seed coat. Generally speaking, the thinner the seed coat, the stronger the binding force with the seed kernel, and the more difficult it is to peel off. Since most of the anti-nutritional substances contained in rapeseed, such as mesonine, pigment, phytic acid, and ...

AI Technical Summary

Problems solved by technology

This method has a low powder degree, but due to the different sizes of the grains, it is prone to seed leakage and the shelling rate is not high

If the grains are first graded and then peeled, although the peeling effect can be improved, the graded treatment process is complicated, which increases equipment investment and increases production costs.

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