Back pressure spiral compression spring damper adjustable in stiffness

Abstract

The invention relates to a back pressure spiral compression spring damper adjustable in stiffness. The back pressure spiral compression spring damper is characterized in that a back pressure device is arranged between two end plates and comprises three or more prepressing steel wire ropes, a floating back pressure steel plate, steel wire rope turning elements and steel wire rope self-locking tensioning anchorage devices, and the number of the steel wire rope turning elements and the number of the steel wire rope self-locking tensioning anchorage devices are equal to the number of the prepressing steel wire ropes; the prepressing steel wire ropes are distributed on the periphery of a cylindrical spiral compression spring in a broken line state; one ends of all the prepressing steel wire ropes are symmetrically fixed to the floating back pressure steel plate around the axis of a guide rod, and the other ends of all the prepressing steel wire ropes are retraced after winding the corresponding steel wire rope turning elements in a penetrating mode, then penetrate through the floating back pressure steel plate from the positions beside fixing points of the prepressing steel wire ropes on the floating back pressure steel plate and are anchored to the end plate adjacent to the floating back pressure steel plate through the corresponding steel wire rope self-locking tensioning anchorage devices; and the prepressing steel wire ropes are tensioned to the tensile force required by the preset initial stiffness, so that the cylindrical spiral compression spring is always clamped between the end plate away from the floating back pressure steel plate and the floating back pressure steel plate.

Description

technical field [0001] The invention relates to a building anti-vibration (or vibration) device, in particular to a damping device for a helical compression spring. Background technique [0002] A damper is a device that provides resistance to movement and consumes movement energy. Since the 1970s, dampers have been gradually transferred from industries such as aerospace, aviation, military, guns, and automobiles to structural engineering such as buildings, bridges, and railways. Coil springs are widely used in devices such as shock isolation and shock absorption due to their variable stiffness characteristics in which the load and deformation are linearly related. Coil springs are classified according to the method of use, mainly including extension springs and compression springs, among which cylindrical helical compression springs are most commonly used in dampers. However, a specific cylindrical helical compression spring can only work in a compressed state within the ...

AI Technical Summary

Problems solved by technology

However, this utility model patent obviously has the following disadvantages: 1. Two cylindrical coil springs are required, and the length of the entire damper is relatively long, which is not suitable for installation in a space with a small distance; 2. It is impossible or even impossible to guarantee The stiffness of the two springs (including tensile stiffness and compression stiffness) are equal, so the shock absorption effect is different in different wind directions; 3. The stiffness of the damper cannot be changed to achieve the preset wind resistance level and reduce the cost of shock absorption; 4. A cylindrical coil spring works in two states of tension and compression at the same time. The metal material and production process of the existing spring are difficult to meet the requirements. The stretching and compression can only be realized by reducing the elastic deformation range of the cylindrical coil spring. Two working states, which will obviously cause waste of resources

It can be seen that although the stiffness of the spring in the patent application scheme can be changed, the effective working length of the spring is not only significantly shortened, but also can only be compressed for energy consumption and vibration reduction, and cannot be stretched for energy consumption and vibration reduction.

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