Structure and composition of wind turbines

Wind turbine is the wind energy into electrical energy, their capacity can be divided into: Small (10kw or less), medium (10-100kw) and large (100kw above) wind turbines. According to the relative position of the spindle and the ground can be divided into: horizontal axis wind turbine and vertical axis wind turbines. Horizontal axis wind turbine is a form of the world's most successful wind turbine, wind turbine main advantage is that you can set up to a higher place from the ground, thus reducing ground disturbance due to the dynamic characteristics of the wind turbine. It is the main mechanical parts are in the cabin, such as the spindle, gear box, generator, hydraulic systems, and the adjustment device and the like. The national production of small vertical axis wind turbine, mainly due to the low efficiency of vertical axis wind turbines, to be the boot device, but also some technical issues to be resolved.

Medium-sized wind turbine is the hub by blades, wheels, spindles, up gearbox, steering mechanism, generators, tower, control systems and ancillary components (cabin frame brake rotors, etc.) composed.

(A) cabin

Cabin contains key equipment of wind turbines, including gearboxes, generators and so on.

(2) the wind wheel

Said blade is mounted on a wheel hub style, which includes a blade, wheel hubs, spindles, etc. Wind turbine is a wind turbine to accept wind energy components. Blades are the most critical components of a wind turbine, a modern wind turbine rotor blades each measuring length is approximately 20 m blade number is usually 2 or 3, most of the rotor blades of glass fiber reinforced plastic (GRP) manufacturing. Can be divided into variable pitch blades and two blade fixed pitch, and its role is to speed when the wind reaches the rated wind speed wind turbine design, it is necessary to take measures on the wind turbine, wind turbine in order to ensure output power does not exceed the allowable value. Is connected to the blade hub and spindle components. Wheel generally consists of cast or welded steel, which does not allow slag, sand holes, cracks and other defects, then the blade can withstand the maximum centrifugal load to design. Also known as low-speed spindle axis, the axis of the rotor and gearbox together, bear larger torque due to its speed is generally less than 50r / min, usually from high-strength alloy steel.

(3) the growth rate is

Accelerator is the gear box, is one of the key components of wind turbines. Since the wind turbine operate at low speed, the generator operates at a high speed, the use of matching the growth rate to achieve a gearbox. Use low speed wind turbine gearbox on the rotor, high torque can be converted to high speed generator on the lower torque for.

(4) Coupling

Gearbox with shaft coupling between the generator and, in order to reduce floor space, often coupling and brake design together.

(5) Brakes

The brake is to stop the rotation of the wind turbine device, also known as the brake.

(6) Generators

Wind turbine generator is the most critical component is the wind eventually converted into electrical energy equipment. Good or bad performance of the generator directly affect the overall efficiency and reliability. Large wind turbines (100-150 kW) typically produces 690 volt three-phase alternating current. Then the current through the transformer wind turbine next to (or in the tower), the voltage is increased to 1-3 million volts, depending on the standard of local grid. Commonly used on wind turbine generators are the following:

① DC generator, commonly used in the micro, small wind generators.

② permanent magnet generator, commonly used on small wind turbines. China has now invented the AC voltage 440 / 240V high efficiency permanent magnet alternator, can be made much on low speed, especially for wind turbines.

③ synchronous or asynchronous AC generator which armature magnetic field is not synchronized with the main rotation, the speed is slightly lower than the synchronous speed, the speed should be increased when the grid.

(7) of the tower

Wind turbine tower is supporting bracket. A type of steel structure of the tower, there are three forms of conical steel and reinforced concrete, etc., wind turbine towers and rotor containing a cabin.

(8) speeder

Wind speed is changed, the speed of the wind wheel will wind speed changes. To make wind wheel driving apparatus required under the rated speed is called speeder, speeder just above rated wind speed at the time. Currently speeder used in the world are the following:

① pitch of variable speed control device;

② given speeder tip stall pitch control;

③ centrifugal fly ball speed control device;

④ aerodynamic control devices;

⑤ turned, looking upward speeder.

(9) adjusted to (yaw) device

The device is adjusted so that the wheel has been aligned with the wind so that the wind when the wind wheel device functioning. With the motor to rotate the nacelle so that the rotor facing the wind. Yaw device consists of an electronic controller operation, the electronic controller can feel the wind through the vane. Usually when the wind changes its direction, the wind turbine will deflect a few degrees.

(10) wind turbines microcomputer control system

Computer control of wind turbines are discrete control, is the wind vane, anemometer, wind wheel speed, the generator voltage, frequency, current, generator temperature, the growth rate of temperature rise, the cabin vibration, tower vibration, cable too winding, grid voltage, current, frequency sensor signal by the a / D conversion, and then transported to the microcontroller design program gives various commands for automatic start, automatic transfer to automatic control, automatic grid, automatically splitting, run the automatic shutdown of unit failure, automatic cable unwinding, vibration shutdown, automatic control over the winds stop and the like. Self failure diagnosis and fault output terminal computer needs repair failure, after repairs to the computer by maintenance personnel to instruction, computer and then perform an automatic control program. Unit group of wind farms can achieve network management, mutual communication, faulty wind a chance to read out on the PC computer terminals and monitors terminus, tune out the program and modify the program, so that modern Wind Solar Power System truly a scene nobody duty automatic control.

(11) Cable twisted cable counter

Cable is used to carry the current from wind turbines to the important device under the tower. But when the wind accidentally deflected in one direction for too long, the cable will become distorted, leading to broken cable or other failure occurs. So wind turbines are equipped with cable twist counter to alert the operator should untie the cable. Wind turbines will be equipped with a pull switch is activated when the cable is twisted too much, disconnect the device, or the brakes down, and then unlock the cable.

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Natural stone cutting

Stone Processing dominated by flat plate to the plane sheet, cylinder, polyhedron, curved body, carvings and other varieties of stone products development. Traditional processing methods, such as using a chisel and chisel were manually peeling and grinding stone processing, has a long history, but dust and labor-intensive, low efficiency, poor dimensional accuracy and surface quality. From this date the 1970s, have developed a variety of special machinery granite cutting machine, such as diamond wire saw, diamond sawing machine, vertical engraving machine, CNC machining centers, multi-function, its working efficiency greatly exceeds the manual processing, and stone implements industrial mass production.

1. Diamond Sawing Machining

Diamond Cutting Tools: superior cutting performance and wear resistance, is widely used in stone and many other industries, but the higher cost of diamond saw blades, and its direct impact on the life of stone processing costs. Therefore, the correct choice of the blade while cutting should be a reasonable process parameters to improve blade life and cutting efficiency.

(1) diamond saw blade wear

Wear properties of diamond saw blade cutting tool to reflect the performance of the reasonableness of one stone cutting process parameters, can be an important indicator of sawing workability.

A typical diamond wear process: diamond protrusion reach working height, crushing, abrasion binding agent, then a diamond blade, broken grains, grains completely off.

Diamond abrasive wear process, the ongoing micro-crushing, local crushing process makes the continuous generation of new cutting edge, the blade is sharp and cutting state, high cutting efficiency, cutting power consumption is reduced, but the reduced blade life; while diamond continuously polished and polishing the cutting edge will passivate the cutting force increases, reducing the cutting efficiency, and increased service life of the blade.

(2) cutting process parameters

Cutting process parameters, the greatest impact on the saw blade cutting speed and wear properties, it is mainly caused by changes in temperature and mechanical load sawing, resulting in different forms of diamond abrasive wear produced. In the low speed region, the mechanical load plays a major role for the blade to wear, increasing the cutting speed, cutting depth single diamond abrasive grains and the effective cutting area is reduced, so that the mechanical load decreases, the blade radial wear reduction small, diamond shape to wear polished, off the main; area at high speed, mechanical loads and thermal shock loads have a decisive impact on the blade wear, with increasing cutting speeds, thermal load and mechanical load shock effect increases, saws increased pad wear, diamond grit to break form the majority.

Changing the cutting depth and feed rate is mainly caused by changes in mechanical load impact blade wear. Increased cutting depth or feed rate, single diamond abrasive cutting thickness increases, cutting load increases, the blade wear and tear. In addition, increasing the cutting depth, but also to make contact with the rock diamond grit arc length increases, due to friction, wear diamond shape with polished-based, cutting edge becomes dull, so that the load increases cutting, sawing cutting process instability. Cutting rates at the same situation, when using a large cutting depth small feed rate, cutting diamond abrasive relatively reduced thickness, the cutting path length, wear and tear in the form of diamond grit to grind heat load caused mainly the reduction in the number of broken grains; when using small cutting depth, large feed rate. Diamond abrasive cutting thickness increases, the cutting path is short, at this time, in the form of diamond abrasive wear diamond to mechanical loads and shock effect caused by the broken main.

In addition, the shape of the blade itself, such as diameter, number of teeth, width, etc., as well as material selection coolant to the cutting process, such as the stone also has an important impact. Therefore, sawing stone, the need to consider many factors in order to obtain the best cutting results.

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Air Max 2009 - Comfort & Cushion Combined

If you want a Jordan Air Max that has lots of comfort and cushion about it. Than the Nike Womens Air Max 2009 is the signature tennis shoe that you want specifically. It is a two-layered type of running shoe. Whose top layer of mesh features what is called Fly wire technology? The other sub layer of open mesh is what has lots of tremendous comfort and all the breath ability that the wearer of any kind of shoe wishes to have for the individual from the onset. The Air-Sole unit that this shoe possesses also provides the ultimate in cushioning that anyone would want for overall durability from the get go.

The Air Max 2009 has a top-notch natural feel about it and this is due solely to its forefoot flexibility capability that is not only innovative but which works completely as one is outside running or what not. This line of top cushioned technology first made its appearance in 1987 and the air cushioning technology that accompanies these specific shoes is unique. What makes it so different from other members of the Air Jordan brand is obvious. They were created to protect the feet inside of the shoes exclusively by preventing damage that can occur as the result of attack while on the ground. This cushioning technology uses the air as a defense mechanism to shield the foot while active on the ground and exposed to the chance of unexpected impact.

The Air Max 2009 has a successful combination of all the facets that make up the Nike Air Max as a rule. Not only does this very special shoe possess the highest technology that a brand new sneaker of Nike can offer to the public. It also has all the elements that matter the most and are essential to those who are fiercely loyal to buying from the Nike Air Jordan line in addition. These elements do include the maximum in comfort, as well as all that represents durability, and finally yet importantly. They have a new design that is distinctly all their own and nothing to do with any other Air Jordan signature shoe.

These shoes have sports performance in them and are great for those who love to run on the average. They have a mixture of comfort that seems to work well with high performance and tons of backup support. So if you want a Nike that is very diverse in nature. Then these are definitely the choice for you.

Thermos Vacuum Bottle Care and Use

For Best Results in Maintaining Temperature.

Want to keep the contents hot or cold longer? The key is to preheat or pre-cool your vacuum bottle container. It is easy. Fill the container with hot water or cold water. Let it sit for five minutes. Empty and then refill with you chosen beverage or food. Do not use the microwave to heat your thermos vacuum bottle.

Cleaning

First, avoid two of the big mistakes. Don't wash it in the dishwasher. Wash by hand. Wash all parts in warm mild soapy water. Use dishwashing soaps like Dawn or Ivory or any other mild dish soap. Rinse clean before using. Harsh abrasive cleaners and scrubbers can damage or tarnish the finishes and inside of the containers. Over time, they can even change the flavors of the stored foods and beverages.

Second, avoid chlorine or bleach. Why? Chlorine and some other strong stain removers attack the rubber gaskets in your seals and lid. Over time, your thermos vacuum contents will begin to leak.

Stubborn stains like coffee and tea are removable. A couple of teaspoons of baking soda and warm water can be left inside. Let it stand open for one hour before rinsing thoroughly. On stubborn stains, soaking overnight produces excellent results. A bottle brush can be helpful.

Some prefer to use vinegar instead. Instead of baking soda, they mix 1 part white vinegar and 3 parts water. Let it set. The concentration can be stronger if necessary. On all cleaning, make sure to rinse very well with water.

Wash the outside with a soft, damp cloth or sponge and wipe dry. Now use it.

There are some off the shelf cleaning products available, but why not try using a home remedy before using a more expensive method.