CCTV 2 talks about digital currency recently
monetary policy, like tax, police, court and other state machines, is the foundation of modern state operation and an important part of state machine. As long as there is no fundamental change in the social organization form of the state, the monetary system based on the national credit will always exist, and bitcoin and other virtual currencies will not become the standard currency of a country. Bitcoin is actually just the use of technology, which is at most an asset, not a real currency< Of course, credit money is prone to inflation. In a sense, people's concern about bitcoin reflects people's worry about inflation under the condition of credit currency. Therefore, central banks should strengthen liquidity management, reasonably regulate money supply and keep prices basically stable.
although the issuing method of digital currency is still under study, paper currency has been regarded as "the currency of the previous generation" by some professionals, and it is the general trend to be replaced by new technologies and procts. He Maochun predicted that when the era of digital currency really comes, people will carry less and less cash, travel more and more safe, poverty alleviation more and more accurate, corruption more and more difficult to escape, and thieves more and more difficult to be
on the other hand, the application-oriented digital currency, which is mainly based on the token in China, is also emerging.
The digital currency issued by the central bank is also legal currency, which is no different from RMB! There is no room for BTC to rise! Nothing to look forward to, just wait< br />
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 structurefirst of all, we need to learn and accumulate
Second, we need to follow the right team (because there are many kinds of digital currencies and many kinds of apps)
Third, we need to seize the opportunity and make sure that we can make the transaction
hope you succeed!