Energy-efficient threshing and pneumatic separating process and device

Abstract

The invention relates to an energy-efficient threshing and pneumatic separating process and device. The energy-efficient threshing and pneumatic separating process is characterized in that a two-bin pneumatic separator is adopted for a first stage pneumatic separating unit; three-bin pneumatic separators are adopted for a second stage pneumatic separating unit, a third stage pneumatic separating unit and a fourth stage pneumatic separating unit; and the strips yield of the first stage pneumatic separating unit, the second stage pneumatic separating unit, the third stage pneumatic separating unit and the fourth stage pneumatic separating unit is respectively 45-64%, 15-30%, 10-15% and 5-15%. The strips yield is decreased gradually so that the device dimensions and capacities of the second stage pneumatic separating unit, the third stage pneumatic separating unit and the fourth stage pneumatic separating unit are decreased gradually, and the physical dimension of the fourth stage pneumatic separating unit is 1 / 2 that of the first stage pneumatic separating unit. The purpose of separating qualified tobacco flakes and tobacco stalks is achieved through the technological process, adjustment of the pressure balancing surface position in separation bins of the two-bin pneumatic separator and each three-bin pneumatic separator of the first to fourth stage pneumatic separating units and speed adjustment of a conveying mesh belt.

Description

technical field [0001] The invention relates to a high-efficiency energy-saving leaf threshing air separation process and equipment, in particular to a new technology for leaf threshing air separation and transportation of tobacco sheets and tobacco stems by wind force separation and transportation and a new wind pressure type air separation equipment. The invention belongs to the technical field of threshing and redrying technology and equipment in the tobacco processing industry. Background technique [0002] At present, in the domestic tobacco processing industry, the threshing and air separation process of the threshing and redrying production line has the technological characteristics of graded leaf threshing and multiple air separation and discharge. Separation, the separated tobacco flakes and tobacco stem mixture are transported to the air separator for air sorting of the tobacco flakes. [0003] The domestic threshing air separation production process is: after the...

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Problems solved by technology

[0003] The domestic threshing air separation production process is: after the mixture of tobacco flakes and tobacco stems after the first-level (four) leaf threshers is collected, five air separation and discharge of the tobacco flakes are carried out by five air splitters connected in series. Tobacco leaves with unseparated stems are transported to the next level of leaf thresher for repeated threshering. After multi-stage thresher and air separation, qualified tobacco flakes and tobacco stems are sorted out. The materials are conveyed by conveying fans. The air delivery device consisting of a feeder, a feeder, and an air duct will cause a large temperature drop and a large water loss during the wind transportation and air selection process of the tobacco leaves, resulting in a low rate of large and medium sheets of tobacco sheets, increased crushing, and the air ducts are likely to cause damage. Blockage, the tobacco stems left after air separation flow through all leaf threshers and air separation machines before being discharged in a concentrated manner, reducing the availability of tobacco stems

Moreover, the pipe span of the air supply device is large, the energy consumption of the fan is high, the noise is large, and there is more flying dust in the production and processing process, which will inevitably lead to an increase in dust removal equipment, which will lead to increased power consumption and energy waste. The sealing requirements are high, the control is difficult, and the material conveying stability is poor and easy to block the material

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