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December 18, 2020
At present, the country vigorously promotes clean and environmentally friendly energy sources. Wind power generation has been built on a large scale in many areas of the country because of its safety, environmental protection and pollution-free. The most important components of wind power equipment are generator blades, towers and generators. The generator blades have a long structure and special requirements for the location of the force points. Therefore, the transportation of generator blades has become a clean way to promote wind power generation on a large scale.
A big problem with energy. At present, there are two types of transportation devices mainly used in China: one is the use of a contracted semi-trailer, and the telescopic semi-trailer mainly relies on the expansion of the main longitudinal beam to realize the lengthening of the vehicle to meet the requirements of the transportation of generator blades. The main longitudinal beams of the telescopic semi-trailer include inner and outer main beams to achieve expansion and contraction, which will inevitably lead to an increase in the weight of the vehicle, a complicated manufacturing process and an increase in timber.
These factors are obviously unsatisfactory in terms of operating economy for transporting blades with a dead weight of up to 6 tons, resulting in fewer and fewer users of such transport devices. The second is to use different devices for lengthening the vehicle, and the lengthening device is fixed to an ordinary semi-trailer by bolts during transportation. Although this structure can meet the transportation requirements of generator blades, the device has poor flexibility. It takes a long time to disassemble and adjust when transporting blades of different lengths, and the installation and disassembly process is more troublesome. It requires the help of large lifting machinery. Time-consuming, laborious, and expensive.
In view of the shortcomings of the prior art, the technical problem to be solved by the present utility model is to provide a special device for the transportation of wind turbine blades to solve the transportation difficulties caused by the long structure of the generator blades and the special requirements for the location of the force points. In order to solve the above technical problems, the special device for transporting wind turbine blades of the present utility model adopts a technical solution that includes a telescopic device, a guide device, a fixing device, and a working platform.
The telescopic device is fixed on the half by the fixing device. On the trailer, it is composed of a front frame and a rear frame. The front frame is guided into the rear frame: the guiding device is connected with the semi-trailer, and the working platform is set at the rear end of the rear frame. When the telescopic device expands and contracts, the guiding device ensures that the front frame and the rear frame expand in the correct direction: after the expansion device is completed, the fixing device fixes it with the semi-trailer; the working platform is connected with the rear frame through bolts to realize the fixing of the blade during transportation. The above-mentioned fixing device is set as a U-shaped bolt. In the special device for transporting wind turbine blades, a pull ring is added to the middle of the end face of the front frame to realize the extension and contraction of the front frame by the tractor. The special device for transporting wind turbine blades has pull rings on both sides of the working platform, so as to hoist the entire telescopic device to a semi-trailer.
Compared with the prior art, the advantages and positive effects of the utility model are as follows:
1. The utility model can realize the conversion from a non-working state to a working state without relying on external crane equipment, and is convenient and quick.
2. The utility model is simple in structure, uses less materials and does not require much special modification of the semi-trailer, so the production and operation costs are low. This special device for blade transportation that does not require the use of special lifting machinery solves the current problems of similar domestic transportation devices in the use process, reduces labor intensity of workers, saves crane costs, improves work efficiency, and realizes the transportation of generator blades. Convenient, fast and economical. In addition, the equipment is light in weight, easy to operate, and low in cost. The special device for transportation of wind power generator provided by the utility model can solve the defects of complicated structure and high cost of the blade transportation device due to the special structure of the generator blade, and the large-scale lifting device is required for the opening and closing process.
In the process of designing wind energy generators. The rationality of the blade design directly affects the conversion efficiency of the generator to wind energy, and will ultimately affect the total annual power generation of the wind energy generator, so the blade design of the wind energy generator is a very important design link for the utilization of wind energy. . In the process of blade design, the first thing to consider is the design standards of wind turbines. In addition, we must consider the specific usage when the wind turbine is put into use and the situation when the generator set is installed. All blade design processes must strictly abide by the overall design plan. The technical requirements and structural design used therein must be consistent with the original light settings of the scheme, and the design goal can be finally achieved
2. Process of blade design
In the process of blade design. The total can be divided into two stages. The first is the aerodynamic design stage, and the second is the structural design stage of the wind turbine. There is a general goal in all design processes: the blades designed have the best shape to achieve annual power generation. The biggest. When designing the structure, we have to choose the structure of the blade and the blade material we want to use. The analysis should consider whether the stability, rigidity and strength of the blade can reach the target in the actual work.
The following procedures are generally followed when designing the blades:
First, the initial parameters of the wind turbine must be set. Then we will analyze the aerodynamic characteristics of the blade and the static structure of the blade. When these two analyses are completed, the parameter results obtained from the analysis should be fed back. Compare with the initial parameters previously set. It is found that there are unreasonable places to modify the parameter content. In the end, a satisfactory design can be obtained. But in the actual design process, the well is not absolutely carried out in accordance with this design process. For example, when designing the blade structure. Structural design is not entirely subordinate. Sometimes when starting to discuss the overall structure of the blade. Need to think about the content of the plan from the perspective of structural design. Finally put forward the amendments to the pneumatic scheme. And sometimes due to structural design reasons, it is necessary to change the aerodynamic shape to finally obtain a blade with reasonable structural performance. Therefore, the overall design of the blade is often the result of a reasonable balance of various performance relationships.
3. Determination of blade type
Choosing the type of wind turbine blades is very important for the design of wind turbine blades, because the type of blades directly affects the start-up of the wind turbine and the conversion efficiency of wind energy during the operation of the wind turbine. All blades can be divided into the following categories: twisted type, sail type, and flat type. Among these types, different blade types have different usage characteristics. For example, sail type and flat type are often used in low speed areas. Because this type of blade is a flat plate as a whole. The windward angle will not change in this quiet situation. It is precisely because the windward angle of the overall blade does not change. So the overall structure is relatively simple and easy to manufacture. The cost is relatively low. The disadvantage of this type of blade is that it does not change the angle to the wind, and at the same time it does not have an excessively high wind energy conversion efficiency. Different from the flat type and sail type are twisted blades. The main feature of the twisted blade is that the blade changes its installation angle with the length of the blade. And the angle from the root of the blade to the tip of the blade will gradually change, so that every part of the blade as a whole can reach the best windward angle, and the highest wind energy conversion efficiency can be obtained. However, due to the complex structure of this type of blade, it is difficult to manufacture and the cost is relatively high.