Five major faults in Xiaoyi building intercom
Flake Graphite is a natural crystalline Graphite . It is shaped like fish phosphorus, and is a six-square crystal system. It is layered and has good properties of high temperature resistance, conduction, heat conduction, lubrication, plasticization and acid and alkali resistance.
Flake graphite is a natural solid lubricant of layered structure, rich in resources and cheap in price.
feature
The flake graphite crystallization is complete, the film is thin and the toughness is good, the materialized performance is excellent, has the good thermal conductivity, the conductivity, the thermal shock resistance, corrosion resistance and so on.
distribution
In December 2015, geological prospectors found a large scale graphite mine in alashan, Inner Mongolia. The total amount of graphite resources was 1. 300 million tons, about 7 of the world's recoverable reserves. 3%, average grade 5. 45%. According to the introduction, such high grade, large-scale Graphite Mineral deposits are rare in China. [1]
In 2013, the U.S. geological survey reported that the global scale of graphite minerals was less than 5 million tons. The discovery was made in alashan, which has a large scale of 703 million tons of graphite in the area of zahan mushi.
classification
Classified according to the carbon content
Like C %, 99.9% High Purity Graphite; Ninety-four percent of "C %" is High Carbon Graphite; 80% "C %" is Medium Carbon Graphite; 50% "C %" is low Carbon Graphite .
Classification by size of granularity
When the particle size is smaller than w38 micropowder graphite.
standard
Scale graphite standard GB T 3518-2008
apply
refractory
Flake graphite is widely used in the treatment of gold industry of advanced refractory materials and coatings. Such as magnesia carbon brick, crucible, etc. Military industrial firework material stabilizer, smelting industrial desulfurization growth agent, light industry lead pen, electric industry carbon brush, battery industry electrode, fertilizer industry catalyst and so on. The flake graphite is deeply processed, and it can produce the graphite milk for lubricant, deformable agent, drawing agent, conductive coating and so on. It can also produce Expanded Graphite for flexible graphite products such as flexible graphite seals and flexible graphite composite products.
dope
The flake graphite as the functional filler of coating is mainly used for anticorrosive coating, fire retardant coating and conductive coating.
As an anticorrosive material, it has anti-rust primer, such as carbon black, talcum powder and oil, which has good corrosion resistance of chemicals and solvents. If you add zinc and yellow to the formula, it is better to rust.
A graphite interlayer compound obtained from Natural Graphite scales as raw materials, chemically or electrochemically treated. Expandable graphite under the condition of heat, swelling volume (up to 300 times) suffocate the flames, at the same time generate inflation, to isolate the flame, delay or interrupt the effect of flame spread, and itself does not burn, good flexibility, high surface energy, intensity of carbonized layer. But the volume and dosage of the expansive body should be suitable. The test shows that the 150um particles, 30% expansion multiples and 5% dosage are the most suitable.
The flake graphite can be directly used as a carbon conductive filler and can be made into a composite conductive filler for conductive coatings. However, due to the large addition of graphite flake, the coating can be brittle and its application is limited. Therefore, measures are taken to further improve the conductivity of graphite and effectively reduce the amount of graphite flake. Our domestic chemical machinery research institute has developed a high temperature and corrosion resistant resin as basic material, with the strong ability of conducting electrostatic entities large flake graphite flake as the main aggregates, with high intensity of ontology Good abrasion resistance.
The anti - deformation cracking - good short - cut fiber material is a solvent - free thick film conductive coating. The coating has the characteristics of anti-corrosive media penetration, small residual stress, good anti-matrix deformation, stable construction performance and long - term conductive static. Can be used in oil tank inner wall guide electrostatic coating. With electroless plating technique, according to the data of graphite powders metallized, such as copper, nickel, silver, such as the preparation of composite conductive filler, with 30% of the amount used in conductive coating, not only its conductivity is very good, and further improve corrosion.
Flake Graphite Flake Graphite,Graphite Sheets,Natural Flake Graphite,Medium Carbon Graphite Fengcheng Ruixing Carbon Products Co., Ltd , http://www.lnfcrxts.com
Symptom: Encoded black-and-white visual system, in which one of the extensions monitors the image of the host computer with severe texture interference.
Solution: Replace an extension video cable.
Principle analysis: The user-purchased video cable production process is too poor, for the non-standard video cable, the video cable copper core is not wrapped in the middle position, which belongs to the eccentric core, causing problems in the extension video.
Lessons learned: Users can't just pursue the low price when purchasing the wire. When the price is low to a certain extent, the quality of the wire should be strictly checked. There are copper clad aluminum, copper clad steel, non-standard, doping and so on. It is recommended to use the wires of regular manufacturers. Hong Kong TPV has a wire and cable factory in Beijing, and the quality is relatively reliable.
Second, the Weihe Jindi Ziwei Garden scene
Symptom: Press the visual system directly, the door host has noise during standby.
Solution: Use a wire to connect the 20V power supply to the ground. It is connected to a 20 volt negative electrode on the main casing or the door. If the door is not well grounded, you can also pull the 20 volt negative wire directly to the ground, and use the steel bar to nail it into the ground for about 1 meter, and splash the salt water around it.
Principle analysis: The power supply grounding condition of the residential area is not good, and the interference signal cannot be directly introduced into the earth, but is amplified by the host power amplifier to form noise.
Third, Sanmenxia site
Fault phenomenon: Directly press the color visual system, there are 12 households on the sixth floor, and there is no color on the sixth floor.
Exclusion process: First call the Sanmenxia customer to check the line, the other manager also let the construction workers check, the construction workers have always said that there is no problem. Our engineers once again telephoned: Change the six-story non-color extension to the fifth floor. The result is colored, indicating that there is no problem with the extension host. The problem is on the online road, so the emphasis is on the fifth floor. However, the construction workers are not willing to take responsibility, let the other manager call us, and strongly demand that the factory send engineers to the site for inspection. After the engineer went there, he found that there were two 18-volt power cables at the extension on the fifth floor. One of the multi-core wires was stripped of more than ten copper wires by the constructor. The wires with a cross-sectional area of ​​0.5 had 28 copper wires. Now There are more than a dozen of them left, causing a severe drop in voltage, which always affects no color.
Solution: Reconnect the partially broken 18V power cord.
Lessons learned: The responsibility of the construction and wiring staff and the rigor of the work attitude are very important. For individual construction workers who are not responsible, a small mistake can lead to serious consequences.
4. Xinyang Yihe Garden Community Site Fault phenomenon: Coded color vision system, the image of the extension is distorted and the color reproduction is excessive.
Solution: Add a 75 ohm matching resistor to the ground on the video main line.
Principle analysis: The video signals of each extension of the building system are superimposed in parallel on a video main line, making the video signal stronger, so the image of the extension has a phenomenon of image distortion and strong color. Add a 75 ohm resistor to the ground on the video main line to weaken part of the video signal and restore the normal image.
V. The scene of the family building of the Henan Provincial Inspection Institute Fault phenomenon: the coded intercom system, the whole unit host gives the extension a small voice.
Solution: The microphone hole of the host is blocked by the bug, and it is cleared and returned to normal.
Principle analysis: The microphone hole on the main unit casing is only 1 mm in diameter, and any foreign matter blocking the small hole will weaken the sound transmitted to the microphone.
