Fuzzy-control-based adaptive control method for pneumatic cut tobacco feeding system

Abstract

The invention discloses a fuzzy-control-based adaptive control method for a pneumatic cut tobacco feeding system, which comprises the following steps of: aiming at the automatic control of the motor operation frequency of a negative-pressure fan, establishing a motor frequency dynamic characteristic function according to the wind speed required by each branch pipe, the operation number of cigarette making machines and a cut tobacco collecting bin material filling signal of each cigarette making machine so as to control the output frequency of the motor in real time; and for negative pressure control of an air return branch pipe and air speed control of a wire feeding branch pipe, constructing a corresponding internal relation through a Bernoulli equation according to an involved air pressure set value and an involved air speed set value, feeding back air pressure and air speed to each other, and rapidly adjusting the air pressure and keeping the air pressure stable through an adjusting valve of an air supplementing pipe through PID operation. Meanwhile, the air leakage compensation function is added, an air leakage compensation coefficient is obtained through a fitting curve between the valve opening value of an air speed adjusting valve and the air velocity coefficient within a period of time, then the size of the air leakage compensation value is determined, and then the air speed stability in the wire feeding process is improved.

Description

technical field [0001] The invention belongs to the control field of wind power wire feeding system, in particular to an adaptive control method of wind power wire feeding system based on fuzzy control. Background technique [0002] Wind wire feeding system is one of the main ways for cigarette industrial enterprises to realize automatic shredded tobacco conveying. It adopts the principle of negative pressure suction to convey shredded tobacco from wire feeding feeder to cigarette rolling machine through a closed pipeline. The negative pressure generated by the negative pressure fan is distributed to the negative pressure branch pipes connected to the main pipe through the main pipe to realize the wind transportation of cut tobacco. In order to stabilize the wind pressure balance in the pipeline, cigarette factories often use the way of making up air for the main pipe and the air pipe respectively. In actual production, there are two problems as follows: [0003] 1. The win...

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Problems solved by technology

[0003] 1. The wind conveying of shredded tobacco is random and intermittent, resulting in large changes in the negative pressure of the main pipe and branch pipes

In order to ensure a constant negative pressure in the pipe, the air supply valve needs to be operated frequently, resulting in large energy loss, large fluctuations in the air delivery speed of shredded tobacco, and a high rate of shredded shredded tobacco

[0004] 2. During production, due to the uneven distribution of shredded tobacco on the equalizing plate of the flexible wire feeding machine, in order to prevent the shredded tobacco from being blocked when the wire feeding pipe is conveyed, the fan usually operates at a higher frequency to ensure sufficient negative pressure in the pipe, and the energy consumption is relatively high. high

Although this control method takes into account the operating number of wrapping units and the different material requirements of each wrapping unit, some parameters in the control are still empirical values, and the control method is also different from that of the present invention.

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