As the saying goes, "No rules are not a rule," and in many industries, if there are no standards, then many jobs will be unfounded and cannot be carried out normally. Therefore, in the grain inspection process, the inspection work must be based on a certain degree. The standards and requirements are carried out. For example, in the determination of flour grain size, the new national standard GB/T5507-2008 "Determination of the thickness of grain and oil powders" is used as the standard, and the new national standard powder screening is used to meet the measurement requirements. And development, also need to be based on this standard. So what is the new national standard powder screening? What are the main characteristics of the new GB powder screening?
The new national standard powder screening is also called circular powder screening, circular inspection flat screen, etc., it is also known as the new national standard powder screening, mainly because of its research and development standards based on the new national standard GB/T5507 -2008 "Determination of grain and oil inspection powder thickness", from a functional point of view, the new national standard powder screening is a professional instrument for measuring the fineness of powdered grain. The principle is that the sample is sieved on sieves of different specifications to achieve different particle separation, and then the thickness of the powdered grain is calculated according to the residue amount on the sieve. The new national standard powder screening machine adopts a worm gear pair with low center of gravity and high precision for the transmission of gears. Through the eccentric linkage mechanism, it performs the plane rotation motion. Under the action of the internal balance device, the operation is more stable, and the tray is pressed together. The rod seat makes the screen more reliable and easier to operate.
The new national standard powder screening is a very important part of the food testing process. Therefore, the new national standard powder screening is widely used at all levels of grain and oil quality inspection stations, quality and technical supervision bureau product quality inspection, food processing plants. And the department must carry out the necessary inspection equipment for the determination of classification thickness. The application of the instrument can not only help the inspection personnel to obtain the test results quickly, but also the detection process meets the requirements of the small standards. The test results are representative and provide an important reference for evaluating the quality of powdered food.
Fixed tube heat exchanger consists of tube bundle, tube plate, shell, head, folded plate, etc. Tube bundle ends fixed in the tube plate, the tube can be expanded (the inner hole of the tube with mechanical expansion, so that the tube wall from the inward to outward extrusion and fixed in the tube plate) or welded to the tube plate. The tube bundle is placed within the tube shell, with headers and flanges fixed at both ends. In this way, one fluid flows from the inside of the tube and the other from the outside. The space between the two heads and the tube plate is used to distribute or collect the fluids inside the tube. The two fluids do not mix with each other, but only exchange heat through the tube wall.
Advantages: simple and compact structure, high pressure resistance, low cost and easy to clean the tube side.
Disadvantages: Risk of blockage when the tube is damaged or needs to be replaced.
When the difference between the wall temperature of the tube bundle and the shell or the coefficient of linear expansion of the material is large, a large thermal stress will be generated in the shell and the tube bundle. A flexible compensation ring (also called expansion joint) should be installed on the shell to reduce the thermal stress.
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