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May 27, 2021
1. Different types of windmill blade trailers
Wind blade transport trailers include ordinary extendable wind blade trailers, axial wind blade trailers, and lifting wind blade transport semi-trailers.
①Ordinary extendable wind blade trailers are a bit similar to lowbed transport vehicles, but the girder adopts a buckle box design. The girder is extended to adjust the length of the vehicle to adapt to the transportation of wind blades of different lengths. It is understood that the current domestic pumping The extendable-type wind blade transport semi-trailer can be up to 62 meters long.
②The big difference between the axial windmill blade trailer and the ordinary extendable wind blade transport is that the chassis adopts a hydraulic axis design, so that the vane truck has a lower cargo deck and more flexible steering.
③Lifting blade transport semi-trailer refers to a blade transport vehicle equipped with a hydraulic lifting device, which is mainly aimed at the transportation of blades in mountainous areas. In the case of flat roads, the blades are transported flat. In the case of extremely small turning radius in mountainous areas, raise the height of the items carried by the lifting device (usually 5-10 meters), shorten the length of the vehicle and bypass obstacles.
Windmill blade adapter
In this design structure, the wind turbine blades are fixed on the adapter. The special thing about this trailer is that the adapter is customized for the blade.
This means that it is unlikely to be used for other functions. If you only need to transport wind turbine blades, then it is the trailer you need.
Although it is usually made of the best materials with sufficient yield strength, its customized blade design may not make it suitable for other types of loads.
These type of trailers are used to transport turbine blades on mountain roads and curved roads as well.
Because of the fact that extendable trailers are too long, when it comes to a mountain road, it is hard to steer hence the need for the special blade trailer.
The design is made in such a way that the blade adaptor can lift up and down making it easier for the trailer to steer easily.
3. Constraints and boundary conditions
The load carried by the frame of the blade transporter is more complicated during the driving process. In summary, there are mainly bending loads, torsion loads, lateral loads and longitudinal loads. Among them, the bending load is mainly generated by the mass of the frame, on-board blades, support devices, etc. under the action of gravity; the torsional load is generated by the asymmetric support of the vehicle body caused by the unevenness of the road surface.
As a comparison calculation, the static maximum possible torque can be used, That is, the limit state of a front wheel hanging in the air or the simulation of a wheel riding obstacle; the side load is mainly generated by the centrifugal force when the car is turning; the longitudinal load is due to the inertial force of the car when accelerating and braking And produced. According to the actual driving situation and operating environment of the transport vehicle, the following two typical working conditions are selected for calculation.
The first is the bending condition, that is, when the car is running on a level road when it is fully loaded, it simulates the normal running of the car on a straight and good road at a constant speed. At this time, all wheels are in the same plane, and the frame is mainly subjected to bending loads. The second is the bend and torsion condition, that is, the situation when the car is fully loaded on the uneven road, which simulates the situation when the vehicle is driving on the uneven road. Under this condition, the left front wheel of the first axle is suspended, and the other wheels remain unchanged in horizontal plane.
The load conditions mainly include three parts, one is the weight of the frame, the other is the gravity of the power pump station borne by the frame, and the third is the weight of the blades borne by the frame: the self-weight of the frame is loaded on the vehicle by means of inertial force. The weight of the power pump station is 0.6t, and the surface load is uniformly loaded on the rear of the frame: the load bearing method of the blade is two-point support, and the asymmetry of the blade itself makes the load on the front and rear supports different.
The position of the center of mass of the blade and the support position of the blade determined above can calculate the external force of the successive support points respectively, that is, the front support point is 5.3619t, and the rear support point is 6.23764t.