Issn 305-9397. Ғылым және білім. 2022. №1-1 (66) issn 2305-9397
ISSN 2305-9397. Ғылым және білім. 2022. № 3-3 (68)
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- Objects and methods of research
| ISSN 2305-9397. Ғылым және білім. 2022. № 3-3 (68)____ _
227 In connection with these advantages, the number of electro technological microwave installations is constantly growing both in everyday life and in industry [2,3]. Therefore, there is a need to create efficient, improved electro technological microwave heating installations, as well as reliable power supplies for these installations [5,6]. There are various designs of electro technological microwave installations. For drying bulk materials, microwave installations of a conveyor type have certain advantages, in which microwave energy is distributed throughout the volume of the installation due to the use of several generators of microwave oscillations [5]. The proposed design of such an installation is shown in figure 1. The setup contains six beam- type chambers equipped with six TOSHIBA E3328 magnetrons with a nominal output power of 3 kW [6]. These magnetrons operate at a frequency of 2450 MHz, which is excellent for processing bulk materials such as grains, fruits, vegetables and herbs. Each microwave generator has its own independent from other power sources. Such an organization of power supply allows the installation to operate uninterruptedly even in the event of failure of one or two magnetrons [7,8]. Figure 1 - The design of the conveyor-type microwave installation 1 - system for delivering material to a conveyor belt; 2 - system of protection against microwave radiation; 3 - ventilation system; 4 - processed material; 5 - system for receiving from a conveyor belt; 6 - ventilation pipes; 7 – conveyor belt drive; 8 – installation control system; 9 - rollers-tensioners of the conveyor belt Objects and methods of research. The belt conveyor consists of a closed traction element (tape), which is also a working element that moves along movable roller bearings and goes around the guides. The upper branch of the belt, on which the load is located, moves along the fixed corrugated roller bearings. The lower part of the belt (idle) moves on straight roller bearings 9. The belt is driven by a drive drum 7 connected to an electric motor. During processing, the processed material is continuously moved through the working chamber by means of a winding mechanism. Raw material 4 is fed from container 1 onto a transport belt that transmits microwave radiation and enters the installation where processing takes place. As it passes through the chamber, the processed substance becomes 50-80% lighter by removing all liquid from the processed product. The moisture evaporated from the raw material is removed using an exhaust fan and ventilation pipes 6. After passing through the drying cycle through the microwave chambers, the raw material enters the receiving system from the conveyor belt 5. To protect personnel working with this installation from microwave radiation, protective screens 2 are provided, which are installed at the inputs and outputs of microwave cameras. Protective screens are flexible foil sheets on which a material absorbing microwave radiation is applied. This solution allows you to absorb the excess microwave energy reflected from the raw material. The process of starting the installation takes place in the following mode: before turning on the magnetron generators, the conveyor belt is set in motion, then the power sources of the magnetrons and the engine of the ventilation system are turned on. Then the processed material begins to arrive on the conveyor belt from the delivery system. By this moment, the magnetrons are already entering the operating mode, and the technological process of drying the processed material is taking place. You |