Waves refer to electromagnetic waves whose frequency exceeds 1 GHz. Wavelengths range from millimeters to centimeters, and their wavelengths are shorter than ordinary radio waves. Wireless microwave transmission is similar to linear transmission of light and is a relay transmission in the range of sight distance. With the characteristics of line transmission and multi-path transmission in the line-of-sight range, wireless microwave transmission is divided into: analog microwave transmission and digital microwave transmission.
Wireless microwave transmission is divided into: analog microwave transmission and digital microwave transmission.
Analog microwave transmission
Analog microwave transmission is to directly modulate the video signal on the microwave channel (microwave transmitter, HD-630) and transmit it through the antenna (HD-1300LXB). The monitoring center receives the microwave signal through the antenna and then passes through the microwave receiver (Microsat 600AM) demodulate the original video signal. If you need to control the PTZ lens, add the corresponding command control transmitter (HD-2050) in the monitoring center and configure the corresponding command receiver (HD-2060) on the monitoring front end. This monitoring method is very clear and there is no delay. There is no compression loss, the cost is cheap, the construction is easy to install and debug, not suitable for general monitoring points, and it needs to be used when there are not many relays.
Digital microwave transmission
Digital microwave transmission is to first encode the video (HD-6301D), and then through the digital microwave (HD-9500) channel modulation, and then transmitted through the antenna, the receiver is the opposite, the antenna receives the signal, microwave despreading, video decompression, Zui restore the analog video signal, but also after microwave despreading through the computer to install the appropriate decoding software, using computer software to extract the video, and the computer also supports video, playback, management, cloud mirror control, alarm control and other functions; this monitoring There are 720*576 and 352*288 resolution options. The former is more expensive and the video has a delay of about 0.2-0.8 seconds. The cost varies greatly depending on the actual situation, but there are also some advantages that are not comparable to analog microwaves. There are many monitoring points, the environment is more complex, there are many cases where relaying is needed, the monitoring points are more concentrated, it can concentrate on transmitting multiple video, the anti-jamming capability is better than the simulation, etc... The advantages are more suitable for monitoring points. It is necessary to use relay when there are many.
PTA Powder
Main application:Repair and
strengthen workpiece surface, significantly
Welding method:PTA welding
Main equipment:PTA welding
machine
Flame core temperature: about 10000℃
Technological characteristics:PTA has high
temperature, concentrated energy, stable combustion, small heat affected zone,
fast welding speed, high production efficiency, easy to obtain low dilution
rate of surfacing layer, surfacing layer and workpiece matrix are metallurgical
bonding,, bonding strength is high.
PTA welding technology is one of surface
strengthening methods, which has high deposition rate, low dilution rate, and
could be applied with many kinds of powder. The manufacturing craft of PTA
powder is normally gas atomization, which reduces satellite of powder. We
supply 4 main categories of PTA powder: Nickel-based alloy powder, Iron-based
alloy powder, Cobalt-based alloy powder and Mixed Powder.
Nickel Based Alloy Powder possesses high
temperature resistance and wear resistance, it is the most popular alloy powder
applied by PTA welding both domestically and internationally. Coating hardness
is within the range of HRC 30-60. It could be applied to various industries
like agriculture, plastic, paper, marine and steel making where wear and
corrosion protection needed. Some examples are plunger, moulds, pump leaf and
screw.
Iron Based Alloy Powder is more widely used
and a more economic choice. With high abrasive resistance, it is more commonly
applied to mining tools, drilling tools and mixers of iron and steel making
industry, coal industry, shaft, oil and energy industry.
Cobalt Based Alloy Powder is recommended
for corrosion and oxidation resistance, with better hot hardness values than
equivalent Nickel based alloy powder. It is widely applied to steel making
industry, coal industry and mining industry.
Mixed powder mainly refers to NiCrBSi
mixing with other hard-phase powder such as cast tungsten carbide and other cemented
alloy powder, which allows the powder better hardness around HRC60 and
excellent abrasion resistance.
Mixed powder is more often used for mining
equipment for oil sands, lignite, oil drilling tools, excavator buckets,
extrusion screws for plastic processing, grain and oil processing, etc.