Analysis on the Specific Division of Functions of Security Monitoring System
For the security monitoring system, according to the different functions of each part of the system, we divide the entire security monitoring system into seven layers - presentation layer, control layer, processing layer, transport layer, execution layer, support layer, and acquisition layer. Of course, due to the increasing integration of devices, for some systems, some devices may exist in the system as multiple layers at the same time.
one. The presentation of the city at the presentation level is our most intuitive experience. It shows the quality of the entire security monitoring system. Such as monitoring video wall, monitors, high pitch alarm horns, automatic alarm answering calls, etc. belong to this layer.
two. The control layer control layer is the core of the entire security monitoring system, and it is the most clear embodiment of the system technology level. Usually we have two kinds of control methods - analog control and digital control. Analog control is an early control method. The console is usually composed of a controller or an analog control matrix and is suitable for a small local security monitoring system. This control method has a lower cost and a lower failure rate. However, for medium and large security monitoring systems, this approach is complicated to operate and does not have any price advantage. At this time, we are more sensible choice should be digital control. The digital control is the control core of the industrial control computer as a monitoring system. It transforms the complex analog control operation into a simple mouse click operation, reduces the huge analog controller stack to an industrial control computer, and changes the complex and huge number of control cables. For a serial phone line. It turns the remote monitoring into facts and provides possibilities for remote monitoring of the Internet. However, the digital control is not so perfect, the price of controlling the host computer is very expensive, the module is wasted, the system may have a crisis of collapse across the board, the control is lagging behind and other issues still exist.
three. The processing layer processing layer may be referred to as an audio and video processing layer. It processes the audio and video signals sent from the transmission layer to distribute, amplify, split, etc., and organically connects the presentation layer and the control layer. Audio and video distributors, audio and video amplifiers, video splitters, audio and video switchers, and so on all fall into this category.
four. The transmission layer transmission layer is equivalent to the blood of the security monitoring system. In the small security monitoring system, our most common transmission layer equipment is video cable and audio cable. For the remote monitoring system, we often use RF cables and microwaves. For remote monitoring, we usually use the Internet. A cheap carrier. It is worth mentioning that the emerging transport layer media - network cable / fiber. Most people have a misunderstanding in digital security monitoring. They think that the digital control security monitoring system used by the control layer is a digital security monitoring system, but it is not. The transmission medium of the pure digital security monitoring system must be a network cable or an optical fiber. When the signal comes out of the acquisition layer, it has already been modulated into a digital signal. The digital signal runs on a network that is already mature and theoretically has no attenuation. This guarantees a lossless display of the remote monitoring image. This is an analog transmission failure. Comparable. Of course, high-performance returns also require high-cost investment, which is one of the most important reasons why pure digital security monitoring systems cannot be popularized.
Fives. Execution layer The execution layer is the command object of our control instruction. At some point, it is not very well separated from the support and acquisition layer that we will describe later. We believe that the controlled object is the execution layer device. For example: PTZ, lens, decoder, ball and so on.
six. Support layer As the name suggests, the support layer is used to support the back-end equipment, protect and support the acquisition layer, the implementation layer equipment. It includes brackets, protective covers and other auxiliary equipment.
Seven. The acquisition layer is the key factor for the quality of the entire security monitoring system, and it is also the place where the system cost is the most expensive. It includes lenses, cameras, alarm sensors, and more.
Flap Disc
Flap disc, commonly known as flat emery cloth wheels, emery discs, flower impellers or elastic grinding discs, are a large variety of coated abrasive conversion products, which press the cut coated abrasive sheets one by one. It is formed by sticking adhesive to the back cover plate along the circumference. The flap disc are called strong elastic grinding discs. They are made of calcined emery cloth, which uses mesh, nylon, plastic, steel paper and other materials as the base. Attached abrasive tools, evenly distributed in a fan shape to ensure the best grinding effect. The particle size is 36#-320#, 60# and 80# are the most common, and the outer diameter is 4"-7" installed on the angle grinder. Angle grinders are mainly installed on hand-held Power Tools to polish and polish welds, burrs, chamfers, surface rust removal, and surface polishing of various metal and non-metal parts.
The flat emery cloth wheel (flap wheel) is formed by sticking multiple emery cloth sheets on the tray in a fan-shaped superimposed arrangement, and the bonding angle between each emery cloth and the tray plane is 10°-30°. The emery cloth arrangement of the utility model can make When the abrasive cloth wheel grinds and polishes the workpiece to be processed, the cutting angle is optimized to ensure that the base material of the abrasive cloth wheel and the grinding are consumed simultaneously, which obviously improves the overall wear resistance and grinding efficiency of the flat abrasive cloth wheel, and prolongs the service life of the abrasive cloth wheel. Grind the surface of metallic and non-metallic materials.
product advantages:
Compared with the resin grinding wheel for fixed abrasives, it has the advantages of polishing and polishing at one time, shortening the operation time, saving the grinding cost, high efficiency, good heat dissipation, high grinding efficiency, reducing operator fatigue, increasing machine life, etc. It has strong elasticity, High tensile and bending strength and good grinding effect. The grinding speed is fast, the effect is good, and the noise during grinding is low. It is suitable for various industries or fields of manufacturing such as major metal parts factories and machinery factories. Good weather resistance, salt spray resistance and heat resistance, suitable for use in different regions.
Scope of application:
It is suitable for polishing of stainless steel, metal, metallurgy, automobile, wood, marble and other industries. It is especially suitable for the processing of stainless steel and can replace the resin-shaped grinding wheel. It has strong elasticity, high tensile and bending strength, good self-sharpening, high grinding rate, and low noise. It is suitable for welding seams in the box. Polishing of the edges.
There are different classifications of louvers according to different angles. The following are two common classifications:
According to the appearance: T27 VS T29
Flap disc generally have two shapes, curved and flat.
The flap disc type is also called the T27 type, and the curved type generally refers to the T29 type.
The flap disc type (T27) has a flat surface. It is mainly used to polish the flat surface and the external edges and corners. The flap disc and the workpiece are angled during work, which can complete the grinding and polishing at one time, reducing the work flow.
The curved surface of the curved louver (T29) has an upward arc, which makes the T29 flap disc have a better cutting ability on the plane. When working, the T29 type grinding wheel forms an angle of 15° to 25° with the grinding surface, which is mainly used to deal with the grinding of contours and edges. When there are higher requirements for speed and cutting ability, T29 flap disc is undoubtedly the best choice.
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According to the type of abrasive particles: ceramic alumina VS zirconium corundum VS alumina
According to the type of abrasive selected, the flap disc can be divided into three types: ceramic alumina, zirconium corundum and alumina.
Because ceramic alumina itself has many crystals, it has good self-sharpening, relatively neat edges, good heat dissipation, and long service life. Therefore, ceramic alumina louvers are mainly used for the grinding of stainless steel, aluminum and other hard metals.
Zirconium corundum itself is a polycrystalline crystal, with fast cutting speed, good self-sharpening, and strong resistance to high pressure and high temperature. Therefore, zirconium corundum louver blades have strong cutting ability and long service life.
Alumina: single crystal, the cutting ability begins to decline at the beginning of grinding, and the abrasive grains are not easy to break, so the alumina flap disc is suitable for the processing of common metals.
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