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Industrial continuous power frequency stream vibrative screening mill
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A vibrating screening technology for industrial use, which is applied in the direction of separating solids from solids with airflow, filtering, and solid separation. It can solve problems such as high frequency, low noise, and small amplitude, and achieve broad application prospects. Effects of audio noise pollution and cost reduction
Inactive Publication Date: 2005-12-21
UNIV OF SCI & TECH BEIJING
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[0004] The biggest advantage of the above-mentioned sound wave sieving instrument is that it uses the electromagnetic vibration of the audio power supply to convert it into the airflow vibration of the audio frequency. This kind of airflow vibration is characterized by high frequency, small amplitude, and low noise (<25dB). The vibration of the airflow is excited to achieve the ideal state of noiseless screening, but there is a fatal weakness in the design of all the above-mentioned sonic screens, that is, the bottom end of the screen is equipped with a capsule for rebounding resonance. It caused the finest powder to fall directly into the capsule, so that the fine powder and the capsule could not be separated, which led to the fact that this sieving machine cannot be applied to continuous large-scale screening work.
Therefore, this kind of sieving instrument has not been fundamentally improved in the past 22 years, and can only be used for small sample sieving analysis.
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Embodiment 1
[0020] Embodiment 1 and effect see figure 1 :
[0021] The power frequency airflow vibrating screen for preparing φ600mm three-layer screen should be designed according to the following
[0022] 1. Preparation of screen frame cylinder
[0023] a. First prepare a stainless steel fully enclosed cylinder with an inner diameter of φ600mm and a height of 500mm, cut into four sections of equal height, connect them with flanges and seal them with "O"-shaped sealing rings to prevent air leakage at the joints of each section.
[0024] b.at figure 1 The coarse powder discharge pipe 11 of each layer, the upper feed bin 4 and the discharge pipe and sleeve pipe of the bottom are welded on the position shown.
[0025] c. The outer ring of the resonance capsule at the lower part of the welding cylinder and the lower double-layer funnel slant plate, the feeding tube of the feeding car cylinder, the welding cylinder bracket 14 and N 2 , Ar gas inlet valve 19.
[0026] 2. Design the power ...
Embodiment 2
[0036] The first and second layers of screen cloth in the embodiment equipment are removed, but the third layer of screen cloth adopts 500 mesh, that is, the screen cloth with a screen aperture of 25.4 μm, and then an ultrafine carbon black with an average particle diameter of 3.5 μm powder, to carry out a comparison test of screening efficiency. The comparison screening device is a product of a certain company - a mechanical vibration sieving instrument. The comparison condition is to weigh 300 grams of ultra-fine carbon black powder each, and the use area of the two screens is 300 cm 2 , the unused sieve area is all closed with plastic tape, and the sieving time is 10, 20, 30, 60, 120, 1800 minutes, and the weight of the powder under the sieve is weighed respectively. The results are shown in Table 2
[0037] Table 2 Comparison of screening efficiency of carbon black powder
[0038]
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Abstract
The invention provides an industrial continuous power frequency airflow vibrating screening device, which consists of a stirring motor (1), a feed inlet (2), a stirring rod (3), a powder bin (4), and an electromagnetic control bell. Feed valve (5), power frequency electromagnetic conversion airflow vibration generator (6), powder dispersing scraper (7), screen (8, 17, 18), electromagnetic automatic discharge valve (9), discharge port seal Plate (10), powder discharge pipe (11), lower cavity rebound resonance capsule (12), powder dispersion motor (13), frame (14), butterfly valve (15), lower powder bucket (16), N 2 , Ar gas charging valve (19) is formed. Use power frequency air, nitrogen, argon vibrating air flow for screening. Its advantages are that it can quickly carry out continuous automatic screening work, no mechanical vibration noise, no oil or lipid pollution, long service life of the screen, no powder blocking the screen holes, high screening efficiency, safety and reliability, and low power consumption. Low.
Description
technical field [0001] The invention belongs to the technical field of screening equipment for powder materials in powder engineering, and in particular provides an industrial continuous power-frequency airflow vibration screening device, which is suitable for industrialized rapid screening of various powder materials. Background technique [0002] Screening of powder materials. It occupies an indispensable position in many industries. For more than two thousand years, human beings have used various fiber materials to make simple screens of various styles. Separation and drum sieving, airflow (liquid flow) filter press sieving, etc. These screening equipment have played an important role in the process of industrial development. However, looking at the development process of screening equipment for thousands of years, there is almost no substantial improvement in the principle of screening equipment. Basically, it belongs to the movement of the screen, which drives the mov...
Claims
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