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The design of two-stage wire rope vibration reduction scheme

In view of the insufficiency of the softening characteristics of the steel wire rope spring, a new type of vibration reduction scheme using the two-stage steel wire rope spring is designed. The scheme consists of high and low steel wire rope, cylindrical hydraulic damper and elastic limit device.

For two levels of sectional steel wire spring, there are three kinds of design schemes: one for height one-piece combination (see figure 1), another for the height of two spring wire rope packing use (figure 2), and the third is a mixture of two forms.

figure 1

figure 2,figure 3

Considering the limitations of the actual installation space of the carriage, the damper adopts the form of symmetry arrangement before and after. The scheme design of two-stage steel wire rope vibration reduction is shown in FIG. 3.

System working principle: when the stretcher bracket system are in a state of static equilibrium, weight (including patients) system is mainly composed of four elastic limit of cylindrical helical spring to undertake, the first level wire spring force is small (or basic does not force); When the vibration energy of the system is small (the road condition is better), the first stage steel wire rope spring is in the working state, and the second wire rope spring is in a free and relaxed state. When the vibration energy is bigger (poor road conditions), the system movement schedule arrived near the next check point, the second wire spring began to work, system stiffness increases quickly (the second spring stiffness for the first level spring stiffness of wire rope 2 ~ 7 times), which can effectively inhibit the movement of a stretcher bracket system. The system adopts the elastic limit device to avoid the impact of the collision of the limit block on the system.

The advantage of this vibration reduction scheme is that the two-stage wire rope spring is used to make up for the deficiency of the soft spring of the single-stage steel wire rope, which makes it more suitable for the vibration reduction of the vehicle.


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