I believe every student has electrical appliances at home, right? But do you know where the electricity production of these devices comes from? Haha, I think everyone already knows that if I don't tell you, yes, it's a generator. I made a generator in science experiment class. Initially, I heard Professor Cui say that making a generator was not fun, but after making it, I didn't think it was much fun anymore. Want to know how to have fun? So come see it with me!
First step: Wrap the enameled wire around the mold. After wrapping, tie a neat knot.
Step 2: Cover the two small openings along the two removed enameled wires
Step 3: Polish the enameled wires with sandpaper, until 'until the silver-white heart is revealed, it is considered a success.
Step 4: Remove the power generation box, use twospring brackets to support both sides of the battery, then insert the battery.
Step 5: Place a magnet under the generator to ensure that the generator can run for a long time. Finally, place the generator on top of the magnet so that it can spin quickly.
What is the difference between vinyl resin and epoxy resin used in wind turbine blades?
In theory it is possible, but in practice it cannot be transported by air.
Currently, many mainline passenger aircraft have cargo warehouses with a carrying capacity of 20 tonnes. However, due to the cabin layout, it is difficult to say whether large molds can be accommodated. Nowadays, small containers suitable for the cabin are generally used. Even if it is installed, the attitude of the aircraft still needs to be taken into account, and ordinary forwarders cannot simplydon't worry about it. This is equivalent to chartered transportation. Whether it is cost-effective should be carefully considered.
At the time, I saw that the standard loading plan of the An-22 was a wagon, which was very shocking, in fact, it had just ranked among the top ten Hercules aircraft in the world.
If long distance transportation is necessary, ground transportation is safer. If the goods are extremely long, such as large wind turbine blade molds, special transportation by out-of-bounds vehicle must be arranged. If possible, shipping takes a little longer, but the price is cheaper.
With the development of wind power until today, cost pressure has always been a problem facing the industry. At the just concluded 6th Asian Wind Power Conference, industry experts believed that the replacementGradual entanglement of epoxy resin, currently widely used, to more cost-effective vinyl resin will become the development trend of wind blades in the future.
Xiao Shuangyin, an engineer at Shangwei Wind Power Materials Co., Ltd., pointed out that the most important advantage of replacing epoxy resin with vinyl resin is that it can reduce the cost of blades. The cost of the blades represents 20 to 30% of the cost of the entire electricity production device, the choice of materials is therefore crucial. Replacing epoxy resin with vinyl can reduce costs by around 10%.
The technical staff of Jinling DSM Resin Co., Ltd. of the DSM Composite Resin Group stated that 10% is only a very conservative estimate. Once the main blade material is replaced, the surface protective layer supporting products such as gelcoat will also be changed accordingly, resulting in cost savings.The effect is all aboutso impressive. Additionally, casting costs represent a high proportion in blade production. Post-curing and other processing are not required after replacing the material, which will greatly improve the use efficiency of the mold. Taking a 1.5MW blade as an example, the mold cost is about 3-4 million yuan. It takes about two days to produce a blade using epoxy resin as the base material, but only one day using vinyl resin.
She also pointed out another advantage of vinyl resin replacing epoxy resin, which is good craftsmanship. Vinyl resin can directly replace epoxy resin without changing the original design of the epoxy resin casting structure. At the same time, since vinyl resin is similar to unsaturated polyester resin, another main material used for blades, we canWe will also learn from the mature blade preparation process using existing unsaturated resins. In addition, vinyl resin has the mechanical properties of epoxy resin, and various performance indicators such as fatigue resistance and rigidity can fully meet the design requirements. Additionally, composite materials are currently used on wind turbine blades. The performance indicators of vinyl resin, fiberglass and other materials, after reasonable matching, are not inferior to those of epoxy system composite materials.
Xiao Shuangyin also affirmed the performance of vinyl resin. He told reporters that vinyl resin has already been widely used in ships and yachts, and its various properties have been confirmed by many parties.
It is understood that, although the vinyl resin presents grands advantages, the development of its applications is still in its early stages. Domestic and foreign companies are actively conducting research on the application of vinyl resin to blades. Limited by various factors, it will take some time to achieve truly large-scale commercial production. However, many blade manufacturers such as Danish Elm Glass Fiber Products Co., Ltd. and AVIC Huiteng Company began to consider or start applying vinyl resin.
Kebao Chemical specializes in vinyl resin and unsaturated polyester resin