Control system for microwave tobacco stem expanding equipment

Abstract

The invention discloses a control system and a control method for microwave tobacco stem expanding equipment. The control system comprises a programmable logic controller PLC, a visible control interface and a group of magnetrons. The visible control interface is connected with the programmable logic controller PLC, and the group of magnetrons is arranged in a microwave tobacco stem expander and is connected with the programmable logic controller PLC; the programmable logic controller PLC comprises a group of PID (proportion, integration and differentiation) controllers, and power of the microwave tobacco stem expander can be continuously regulated and controlled by one-to-one power closed-loop control systems; each power closed-loop control system comprises the corresponding magnetron, a power transmitter, the corresponding PID controller and a power controller which are sequentially connected with one another. The control system and the control method have the advantages that the control system is high in microwave power density and heating speed, low in energy consumption and easy to maintain, the microwave tobacco stem expanding equipment can be automatically controlled, the magnetrons are difficult to burn, requirements of professional, large-scale and continuous production can be met, and manufactured expanded tobacco stem products are stable in quality.

Description

technical field [0001] The invention relates to the technical field of control systems for tobacco stem microwave expansion equipment. technical background [0002] With the development of the modern tobacco industry, the safety and economy of tobacco products have attracted more and more attention. The expanded shredded stems after separate treatment, because of their outstanding advantages, make their application value increasingly prominent, mainly as follows: the expanded shredded stems can effectively reduce the tar content of cigarette products and improve the safety of cigarette products; The bitterness, spicy taste, irritation and miscellaneous gas of the stalk are significantly reduced, which improves the quality of cigarette products; the expanded shredded stalk has a higher filling value, and adding it to the cigarette formula can greatly reduce the cost and increase the profit of the enterprise. Therefore, in the production process of shredded cigarettes, about ...

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Problems solved by technology

Chinese patent CN102326858A discloses a drum-type continuous microwave expansion device for tobacco stems. It adopts a multi-wave source and multi-feeder incoherent power synthesis method to obtain high power. It can basically carry out continuous production, but it does not involve the content related to the control system. Because Insufficient understanding of the discrete characteristics of microwave devices and their systems, the grouping method is used to control their power, and the output of each magnetron is seriously uneven, resulting in frequent burnout of high-output magnetrons, high maintenance costs, and overall performance. It can only maintain operation under low power conditions, which is far from reaching the goal of large-scale and stable production

Chinese patent CN103945586A discloses a microwave mode excitation stirring heating method and its heating device. In essence, it is still a power control of a discrete part of the magnetron full power input / cut-off by the computer in which the magnetron works in turn in combination. In the system, only some magnetrons participate in the work at the same time, which will not only reduce the overall power density of the applicator, but also reduce the overall efficiency, and more importantly, it will change the number and position of the magnetrons (energy feeders) participating in the work. The uniformity of the electric field in the optimized applicator is destroyed, which affects the product quality

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