Miner welding
1. First of all, connect the network cable, plug the network cable into the network cable interface of the mining machine, and remember to plug it tightly. Only when the miner is connected to the Internet, there is no limit to the broadband
extended data
users can buy bitcoin, at the same time, they can also use computers to "mine" bitcoin according to a large number of calculations. When users "mine" bitcoin, they need to use the computer to search for 64 bit numbers, and then compete with other gold miners by repeatedly solving puzzles to provide the required numbers for the bitcoin network. If the user's computer successfully creates a set of numbers, then they will get 25 bitcoins
e to the decentralized programming adopted by the bitcoin system, only 25 bitcoins can be obtained every 10 minutes, and by 2140, the maximum number of bitcoins in circulation will reach 21 million. In other words, bitcoin system is able to achieve self-sufficiency, resist inflation through coding, and prevent others from destroying these codes
as a miner, I used graphics card very early and then butterfly machine. At present, I use Avalon's 220 miner and just received a new 180 ant miner. To tell you the truth, mining is not as simple as you think. Here I will list some practical difficulties you need to face in mining. If you find that some of these items can't be solved and overcome for the time being, don't rush to buy a miner, because from the moment you buy, if you can't mine, Then you will face a real loss
first, list the problems to face
1, be able to accept the noise - the noise of the mining machine is very loud, which is equivalent to that you put the air conditioner outside the room
1-1, strong hands-on ability - the noise can be controlled to a certain extent by adding water cooling, but it needs to be done by yourself. The installation process of water cooling is not as simple as the online tutorial. It needs to be extremely careful. The capacitor on the logic board is easy to touch, and it must be successful at one time. Once the refrigerant is added, the machine will have problems again, It would be disastrous to dismantle the water cooling system
1-2, conditional repair of the chip capacitor - in the process of water cooling installation, the capacitor is easy to fall off, these chip capacitors are very difficult to weld
2, you can set up the network - you can't just plug in the Internet cable! Need to understand the routing, know how to change the IP of the router, mining IP is fixed, according to mining IP to do settings
2-1, you can get a fixed IP address - if you are mining in a company, you can't set up a route, so you must have the condition to get a fixed IP, and then set up your own network through this IP
3. The environment of continuous power supply and continuous network - mining is a 24-hour business. Don't take it for granted that a meeting is OK in one day. Many companies will cut off power at midnight. This must be made clear
3-1. In low temperature environment, in addition to 24-hour continuous power supply, there should also be a relatively cold environment. In actual mining, we can clearly feel the importance of temperature for mining<
let's assume two scenarios,
in the company:
if your working environment is very quiet, it is not suitable, even if water cooling is installed. If you are a senior blue collar, in the workshop, do you have the conditions to set up the network and get a fixed IP? If you can't, give up
at home:
can you stand noise? Can tolerate to a certain extent
is it possible to install water cooling? It can be installed conditionally
is it possible to set up a network? There are also conditions to set up the network
is it warm in that room? Yes, but you can open windows on the second bedroom or balcony
is it possible to pull the wire and the wiring board in the balcony? No problem
congratulations, you can buy a miner to dig it up, but if one of them doesn't work, you need to think carefully before making a decision
the above-mentioned points should not be taken as unimportant or major problems. For example, it is necessary to have the conditions to install water cooling, for example, in a lower temperature environment, for example, to have a fixed IP
when the miner starts to operate and makes a rumbling sound, if you are in the company, you have to turn it off awkwardly. If you are at home, you need to figure out how to explain to your family or girlfriend that the noise will exist for 24 hours, and hope they don't mind
if your home is warm, your miner will never be able to achieve the highest computing power it can. You must accept it calmly, don't be depressed, it's useless to find the seller. Unless you open the window to let in the cold air, you will find that you and the miner are so out of place. That's why laomaozi is very fond of mining< Make complaints about mobile phone, br / > and if you work hard to move the mine to the company, you may think that the electricity charge is in the whole province. You can't get the mine to connect. Then you can only move the mine to home or sell it as a second-hand machine...
these words are typed word by word by me. I hope it can help you. You must find out whether you are qualified to do this at present. As for how to dig, it's a very simple thing: buy a miner, register an account on a mining website, Download a multibit to store the bitcoin you get, and link the miner to the network for power on, Set up the network, give it the fixed IP specified on the chassis, use the computer to access the IP, make some simple settings, and then wait for the receipt
what else can I ask you
Ball mill is a kind of grinding machine widely used in silicate instry. Its main features are: strong adaptability, fine grinding for most solid materials; It has the advantages of simple structure, easy operation and management, accurate control of many process parameters such as material fineness, convenient maintenance and repair, etc. in non-metallic mineral processing, intermittent ball mill with wet operation is usually used
The structure and working principle of intermittent ball mill is shown in Fig. 3-12. The cylinder body 6 is made of steel plate and welded. There is a feeding port 7 in the middle of the cylinder body for feeding and discharging. Some cylinder bodies have a manhole in the middle for repairing the inner part of the cylinder body. The inner cavity of the cylinder body is inlaid with a lining plate 14, and both sides of the cylinder body are usually welded with forged flange rings for fixing the end cover 8. The spindle head 11 is fixedly connected with the end cover and supported by the bearing seat 12 with sliding bearing or rolling bearing fixed on the frame 13. The large gear ring 5 is fixed on the end cover on one side, and the gear ring can be in the form of internal or external teeth. The motor 1 drives the big gear ring through the friction clutch 4 and the transmission gear through the recer 3 to make the cylinder rotate
Fig. 3-12 schematic diagram of intermittent ball mill
1 - motor; 2 - clutch lever; 3 - recer; 4 - friction clutch; 5 - big gear ring; 6-barrel; 7 - feeding port; 8-END cap; 9 - plug valve; 10 - discharge pipe; 11 - spindle head; 12 - bearing pedestal; 13 - frame; 14 - liner; 15 - grinding body
the working principle of intermittent ball mill is: the grinding body 15 with a certain number of ceramic balls or gravels is loaded in the cylinder, the material to be grinded and an appropriate amount of water are added from the feeding port, and the material, water and grinding body should be properly proportioned according to the process requirements. When the cylinder rotates, the grinding body adheres to the inner wall of the cylinder under the action of centrifugal force and rotates and rises together with the cylinder. When the grinding body is brought to a certain height, it is thrown out e to the action of gravity and falls at a certain speed. During the falling process of the grinding body, the materials in the cylinder are crushed e to the impact and grinding action of the grinding body. As shown in Figure 3-13. When the material is grinded to the required fineness, stop the machine for discharging. When discharging, first make the charging port of the ball mill face up, open the cover, install the discharging pipe 10 with holes, and then rotate the cylinder to make the charging port face down. At this time, open the plug valve 9 of the discharging pipe, the slurry in the cylinder can flow out automatically, and the grinding body is blocked in the cylinder. In order to speed up the outflow of slurry and make the slurry discharge more completely, compressed air can be introced at the same time to make the slurry flow out under the pressure of compressed air
Figure 3-13 function of grinding materials of ball mill × Cylinder length, such as qm2100 × In general, the ratio of barrel length to barrel diameter is < inline media object > < imageobject > < imagedata role = 3 "fileref = image / 085_ 3.jpg">(1) the rotational speed of ball mill has a great influence on its operation. If the rotational speed is appropriate, the fine grinding operation can be carried out at a higher efficiency. If the rotation speed is too fast, the grinding body will cling to the inner wall of the cylinder and will not fall along the parabolic trajectory because of the large centrifugal force, so it can not effectively crush the material, and the ball milling speed and efficiency will be greatly reced; On the contrary, if the rotation speed is too slow, the lifting height of the grinding body is insufficient. In unit time, the grinding body has less action on the material, the crushing work is also small, and the ball milling efficiency will be reced. So the appropriate speed, that is, the ball mill cylinder speed is not too fast and not too slow case of reasonable speed
when determining the rotational speed of the mill, it is generally based on the lifting condition of the grinding body in the cylinder or the maximum crushing work of the material at the position of the separation point
when the rotational speed of the ball mill cylinder reaches a certain value, the separation angle of the outermost layer of the grinding body is equal to 0, that is, the grinding body rises to the top of the cylinder and no longer falls along the parabolic trajectory. This rotational speed is called the critical rotational speed of the ball mill, expressed as n < sub > 0 < / sub >
It is composed of the outer radius r < sub > 1 < / sub > and the angle between the position of the grinding body and the heavy line α， It can write out the balance equation of self weight and centrifugal force of grinding body, eliminate the self weight of grinding body
non-metallic mineral processing machinery and equipment
when cos α＝ 1, get the critical speed
non-metallic mineral processing machinery and equipment
where D is the inner diameter of the cylinder (m)
D -- diameter of grinding body (m)
because D ≤ D, the above formula approximates to
non metallic mineral processing machinery and equipment
through theoretical analysis and calculation, when the separation angle of the grinding body is 54 ° At 44 ', the maximum landing height can be obtained
to α＝ fifty-four ° 44 ', r = R < sub > 1 < / sub > substituting (3-21), the working speed of the mill can be obtained
non-metallic mineral processing machinery and equipment
where n is the working speed of the ball mill (R / min)
D -- inner diameter of cylinder (m)
The ratio of working speed to critical speed is called the speed ratio of ball mill_ 6. JPG "> < title > < / Title >< / picdesc > < / imagedata > < / imageobject > < / inlinemediaobject >
it should be pointed out that the mill speed calculated above ignores the influence of the sliding of the grinding body and the material on the movement of the grinding body, and is derived based on the outermost grinding body layer. In fact, the working speed of the mill is related to many factors, so far there is no final conclusion. The above theoretical formula can only be used as a reference. Therefore, the speed ratio Q tends to fluctuate in a large range, and the speed ratio Q of most ball mills is between 0.75 and 0.85
(2) power most of the power required by the ball mill in operation is consumed in beneficial work, that is, lifting the grinding body to a certain height, making it eject at a certain speed, and falling according to the parabolic trajectory to crush the material; The other small part is consumed to overcome the mechanical friction resistanceaccording to the theoretical analysis and calculation, the power consumed in lifting grinding body and material is n
non-metallic mineral processing machinery and equipment
where n is power (kw)
ρ—— The volume density of grinding body (T / M < sup > 3 < / sup >)
D - inner diameter of cylinder (m)
L - cylinder length (m)
The coefficient C in the above formula is determined by the rotational speed ratio Q and the proportional coefficient K, and the value of K is related to not only the rotational speed but also the loading amount of the grinding body In practical work, the filling factor is usually used φ To express the loading amount of grinding body in ball mill. Filling coefficient
non metallic mineral processing machinery and equipment
where m is the total mass of the grinding body of the ball mill
in different Q φ The value of K can be found in table 3-9
Table 3-9 φ Under reasonable working system, generally K ≤ 0.5, so K < sup > 4 < / sup > and K < sup > 6 < / sup > are far less than 1, coefficient
non metallic mineral processing machinery and equipment
the value of coefficient C at different speed ratio can be found out from table 3-10
Table 3-10 C value under different Q value
according to formula (3-24), the power required by the ball mill is on the high side, because in fact, when the grinding body falls, there is a part of energy to be "returned" to the cylinder, but how much of this part of energy in the total energy is still uncertain. Therefore, formula (3-24) is only for reference when selecting the matching motor of ball mill, and the final determination of motor power must be based on the actual operation data. As for the power and power reserve needed to overcome the mechanical friction resistance, it is unnecessary to calculate
(3) proction capacity there are many factors that affect the proction capacity of the mill, such as material properties, feed particle size, degree of fineness to be ground, feeding uniformity, filling degree of the mill and type of grinding body. So far, there is no calculation formula that can include all these factors, and the exact data can only be determined through proction practice, The commonly used calculation formula is as follows:
non metallic mineral processing machinery and equipment
where q is the proction capacity of ball mill (T / h)
D -- effective inner diameter of ball mill cylinder (m)
V -- effective volume of ball mill cylinder (m < sup > 3 < / sup >)
n -- rotation speed of ball mill cylinder (R / min)
m -- loading capacity of grinding body (T)
k - unit power output of ball mill (T / kW · h)
In non-metallic mineral processing, ball mill is the equipment of raw material grinding process, and its operation will directly affect the normal proction of the next process, so it should be operated under the best conditions as far as possible(1) the selection of ball mill model and specification should be determined according to the scale, technical force and maintenance capacity of the plant. Generally, large mills have high operation intensity and low unit power consumption, but the equipment is bulky, difficult to install and maintain, and not flexible enough in use. Small and medium-sized mills are small in volume, light in weight, flexible in mobility, strong in adaptability, convenient in installation and maintenance, but with low operation intensity and high unit power consumption. The number of mills is determined by calculation according to the amount of materials to be processed and the proction capacity of each mill, and proper reserve should be reserved
since the ball mill itself is heavy and vibrates ring operation, it should be installed on a solid foundation, and the foundation weight can be considered as 3-5 times of the machine weight
(2) the loading and selection of the abrasives should consider not only the pollution of the materials, but also the price, source, hardness, weight, harmful components and coloring elements, and the ones with high hardness and heavy weight are better. Commonly used are ceramic balls, corunm, natural flint, etc. Pebbles (containing 98% silica and 2.6% heavy silica) are used in many factories in China × 10N/m3 The size of grinding body is recommended to be d ≤ (1 / 18 ~ 1 / 24) d, D is the size of grinding body (mm), D is the clearance diameter of mill (mm). The surface of the grinding body should be smooth without pitswhen the total assembly amount of grinding body is fixed, the smaller the body is, the more the quantity is, and the larger the surface area is, which is beneficial to grinding; The larger the body, the smaller the quantity and the greater the impact force. Therefore, the gradation of grinding body should be large and small, not uniform. It is generally believed that 50%, 10% and 40% of large, medium and small are better, and the space-time gap is the smallest (about 22%)
There are spherical, flat and short cylindrical shapes in the grinding body. For grinding, short column is better; For grinding mainly by impact, spherical is betterthe loading amount of the grinding body is too small, the milling efficiency is low, and there are too many mutual interference and collision. Fill factor φ Indicates the filling degree of the grinding body:
non metallic mineral processing machinery and equipment
Where a -- the filling area of the grinding body on the effective section of the cylinder (m < sup > 2 < / sup >)
w-weight of abrasive body (n)
R - grinding radius (m)
L - length of grinding chamber (m)
R -- abrasive body weight (n / M < sup > 2 < / sup >)
the ball mill should be operated under full load as far as possible, because the weight proportion of the grinding body is the largest, and no-load and no-load are the most important