Method for controlling dispersion degree of samples on tobacco shred vibration separation screen

Abstract

The invention discloses a method for controlling the dispersion degree of samples on a tobacco shred vibration separating screen. The method comprises the following steps of A, the mass flow parameter m of an optimized tobacco shred vibration separating screen conveying belt being set, and the parameter being a fixed value; B, setting a standard metering box body for taking quantitative tobacco shreds; C, weighing the weight M (g) of the tobacco shreds in the box; D, calculating the time t=M / m (s) required by the conveying belt to complete the conveying of all the cut tobaccos; E, the spreading length of the conveying belt being L, and the conveying speed v= L / t being calculated; and F, uniformly spreading the materials to the belt on the test uppermost layer, and controlling the belt to convey the tobacco shreds at the speed V so that the vibration sorting test of the tobacco shreds according to the same volume flow can be realized. The method is advantaged in that the control on the feeding mass flow rate is realized, so that optimization on the dispersion degree of the tobacco shreds on the screen is realized, consistency of the dispersion degree of the same sample can be greatly ensured, and good consistency and repeatability of a test result are facilitated; and phenomena of screen exceeding and screen leakage are reduced.

Description

technical field [0001] The invention relates to the field of tobacco feature detection, in particular to a method for controlling the dispersion degree of samples on a shredded tobacco vibration sorting screen. Background technique [0002] The structure of shredded tobacco is one of the important factors affecting the quality of cigarettes. The structural characteristics of shredded tobacco have received continuous attention from quality control personnel in the industry. The industry standard "YC / T 178-2003 Determination of Whole Shredded Ratio and Shredded Ratio of Shredded Tobacco" stipulates The technical indicators such as the amplitude, vibration frequency, and feeding speed of the feeding belt for the shredded tobacco vibrating sorting screen specifically stipulate the material spreading area of ​​the feeding belt and the need to run at a constant speed of 0.016m / s. [0003] Due to the different structures of shredded tobacco and the different filling capabilities of...

AI Technical Summary

Problems solved by technology

[0003] Due to the different structures of shredded tobacco and the different filling capabilities of shredded tobacco after being subjected to different processing intensities, shredded tobacco or tobacco raw materials have different bulk densities and dispersibility (which can be understood as looseness or fluffiness), industry standard YC / T 178 -2003 specifies the preset spreading area and constant speed of entering the sieve during sieving, the purpose is to well control the same or appropriate degree of dispersion of shredded tobacco or other types of samples entering the sieve, Due to the existence of bulk density, that is to say, the stacked volume or height of shredded tobacco with the same weight and different bulk densities will have certain differences. When the speed remains the same, when shredded tobacco of the same weight and different types is evenly spread on the feeding belt, there are differences in the height of the material surface or the degree of dispersion between samples, and the shredded tobacco falls into the vibrating screen below under the conveying of the feeding belt. The height of shredded tobacco of each category is different after falling on the screen. In one-time sampling (in order not to cause damage to the structure or size information of shredded tobacco or in-process products), the weight of the sample will vary greatly, and the size of the material is a fixed value. , Entering at the same speed will cause the dispersion of shredded tobacco on the vibrating screen to be different, which will affect the final test result after shredded tobacco is sieved. When it reaches the sieve, it is vibrated out for collection. The shredded tobacco contained in this part of the shredded tobacco will not be sieved out, resulting in leakage. If the shredded tobacco is too thin, it will cause the shredded tobacco to contact the sieve for too long. Part of the shredded tobacco that should not fall will fall vertically through the aperture of the sieve, resulting in over-sieving

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