Central digital currency concept stock
in the A-share market, the concept stocks related to mobile payment mainly include: Hengbao shares, new world, Tianyu information, Zhongke Jincai, national technology, new cape, new Guo, etc.
response time: August 6, 2020. Please refer to the official website of Ping An Bank for the latest business changes
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digital currency is abbreviation of digital currency. It is an alternative currency in the form of electronic currency. Digital gold coin and cryptocurrency (bitcoin, DCT) belong to digiccy
stock is the certificate of ownership issued by a joint-stock company, which is a kind of valuable securities issued by a joint-stock company to each shareholder as a certificate of shareholding in order to raise funds and obtain dividends and dividends. Each share represents the ownership of a basic unit of the enterprise. Behind every stock is a listed company. At the same time, every listed company will issue shares.
On A-share, the leading stock of digital currency concept is Hang Seng electronics, with the stock code of 600570
The main business of Hang Seng Electronics Co., Ltd. is to provide domestic financial institutions with software procts and services as well as financial data business, and to provide wealth management tools for indivial investors
bitcoin is the earliest concept stock of digital currency in China, and there are few practical applications until now. In China, it is mainly speculation. Puyin is known as a standard digital currency with endorsement of real assets, but it is still imperfect. Ethereum is a concept stock.
Currencies like foreign exchange, which are called stocks, are acceptable to more people
To calculate the helical gear parameters, you need to know the basic parameters:
normal molus M_ n. Number of teeth Z, normal pressure angle α_ n. Helix angle β
generally, the crown height coefficient h * is 1, and the root height coefficient C * is 0.25. If there is displacement, it is necessary to calculate the displacement: x
the following is the basic parameter
end face molus: M_ t=m_ n/cos β
Calculation formula of pressure angle at the end face: Tan α_ t)=tan ( α_ t)/cos( β)diameter of dividing circle: D = m_ n × z/cos( β)
addenm circle diameter: no displacement: Da = D + 2 × m_ n × H * with displacement: Da = D + 2 × m_ n × H * + x)
root circle diameter: no displacement: DF = D-2 × m_ n ×( H * + C *) with displacement: DF = D-2 × m_ n ×( H * + C * - x)
diameter of base circle: DB = D × cos α_ t)
in addition, there are more important dimensions, such as normal pitch, end pitch, etc., which can be obtained by referring to relevant manuals
Extended data:
judgment of helix rotation direction: first, we make the gear axis vertical, if the right height of helix is right rotation; On the contrary, the height on the left side of the helix is left-handed
end face and normal surface parameters:
end face: the plane perpendicular to the gear axis, and the parameters on the end face are generally added with subscript t
normal plane: the plane perpendicular to the helix, and the parameters on the normal plane are generally subscript n
(1) pitch and molus: = t= π
(2) pressure angle: generally, the parameters in normal plane are standard parameters
The correct meshing condition: the helix angle must be equal in size and opposite in direction. The normal molus m is equal to the normal pressure angleB. geometric dimension calculation: in calculation, the calculation formula of spur gear can be directly applied to the end face of helical gear because a pair of helical gear transmission is equivalent to a pair of spur gear transmission on the end plane
there are many kinds of gear transmission, among which the efficiency of helical gear is very high, for example, the efficiency of spur gear transmission is lower than that of helical gear transmission
Like spur gear mechanism, helical gear can be used to improve the load capacity of transmission by recing the center distance a, which can be used for high-speed operation. Helical gear recer is a new type of recer. The helical gear recer is small in volume, light in weight and good in economy Advantages:(1) good meshing performance: the meshing process between helical cylindrical gears is an excessive process, and the force on the teeth is graally from small to large, and then from large to small; Helical gear is suitable for high speed and heavy load
(2) large coincidence degree: the increase of coincidence degree can improve the bearing capacity of gear. So the life of the gear is prolonged. The coincidence degree mainly depends on the meshing time, while the long meshing time and large contact area of helical gear rece the stress. The transmission is stable and the economy is increased
(3) compact structure: the less the minimum number of teeth, the more compact the structure