Definition and principle of perimeter prevention
The direct meaning of the perimeter is the outermost collection of the area. The definition of perimeter defense (system) should be: the defense formed along the perimeter. The purpose of establishing perimeter precautions is to form a safe area: to ensure that people, property, etc. in the area are under protection and control, and to restrict the behavior of entering (exiting) this area; once a target enters through the prohibited section (Out) When it is in a safe area, it can detect and find the exact location of the event in time; record the process of the above event; implement a limited warning or strike on the target if necessary. Among the above-mentioned links, judging whether the target is invaded is the first and most critical link in the whole process. The correctness of the response in this link determines the effectiveness of all subsequent links.
At present, perimeter defense systems all use detection of changes in physical media to achieve intrusion detection. The main physical quantities involved in the application are: infrared (active infrared intrusion detector), microwave (shielded microwave intrusion detector), laser (blocking laser intrusion detection Device, optical fiber safety protection network), electrostatic field (electret microphone cable), electromagnetic field (leakage cable, induction cable), mechanical force (tensile electronic cable), etc.
The above basically lists the categories of existing perimeter intrusion detectors, from which it can be found that the above-mentioned intrusion detection technologies are all achieved by measuring the change of a single physical quantity, but the information contained in the entire incident of intruder invasion is by no means Any one of the above single physical quantities can correspond. At present, the detection results of all intrusion detectors cannot be completely accurate, that is, it is inevitable that intrusion detectors produce false alarms and missed alarms! Based on this most basic understanding, we can correctly set up or understand the evaluation criteria of the detector.
Abrasive flap discs, commonly known as flat emery cloth wheels, flap discs, flower impellers or elastic discs, are a large variety of coated abrasive conversion products. It is a method of pressing the cut coated abrasive discs one by one. It is formed by sticking adhesive to the back cover plate along the circumference.
The Flap Disc is mainly installed on hand-held Power Tools for grinding and polishing the welds, burrs, chamfers, surface derusting, surface polishing, etc. of various metal and non-metal parts. Compared with the resin grinding wheel for fixed abrasives, it has Grinding and polishing can be completed at one time, shortening the operation time, saving the cost of grinding, and improving the grinding efficiency. The abrasive self-sharpness is strong and the utilization rate is high. The air cooling does not damage the surface. The surface quality is easy to control and cost-effective, reducing operator fatigue and increasing machine life. And so on, so it is widely used in various industries or fields of manufacturing.
The related abrasive products we can supply is Flap Disc Adhesive , Flap Wheels , Bonded Abrasives , and Abrasive Sanding Disc, such as Abrasive Fiber Disc, Sanding Screen Disc, abrasive silicon sandpaper, if you have any needs about abrasive tools, please kindly feel free to contact us.
Abrasive flap disc can be divided into flap disc, Mini Flap Disc and Flexible Flap Disc according to their shape. There are subtle differences in usage. The flap disc are relatively hard and not easy to bend; the blades of flexible flap disc can be bent at will. Shape, suitable for grinding the edges and corners of the workpiece; mini flap disc is suitable for grinding smaller workpieces. The following is a detailed introduction of the flap disc.
According to the different abrasives, it can be divided into Zirconia Flap Disc,S/C Flap Disc, Ceramic Flap Disc.
1.Zirconia Flap Disc
Mainly used for high alloy, stainless steel and heat-treated steel; high-tensile, non ferrous metals.
2.S/C Flap Disc
Mainly used for marble, stone, glass, and non-ferrous metals.
3.Ceramic Flap Disc
Mainly used for grinding stainless steel, titanium, inconel, and other hard metals.
At present, flap discs are widely used in automobiles, stainless steel products, metal products, glass manufacturing and other industries, and have special effects on welds, solder joints, flash, rust removal and surface polishing. The reason why the flap disc is so widely used is because it has five advantages that cannot be ignored:
1. The flap disc blades have high hardness, high strength and strong grinding ability during use.
2. The flap disc has low noise, low vibration and long service life during use.
3. The flap disc has strong wear resistance and long service life.
4. It is not easy to generate heat and burn parts during use.
5. The use of flap disc can improve work efficiency.
The flap disc blades can be used instead of resin Grinding Wheels and steel wire wheels. They have a good effect on rust removal, grinding and polishing. It is a good way to polish and remove rust. It is worth choosing!
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