CN209483855U - A SMA self-resetting variable friction damping device - Google Patents

Abstract

Become friction damping device the utility model discloses a kind of SMA Self-resetting, including an outer cylinder, a piston, secondary spring on one, once secondary spring, silk cable under silk cable and several SMA on several SMA.The SMA Self-resetting change friction damping device of the utility model is of simple structure and low cost, performance is stablized, and detachable, is easily changed when the damage of damper internal part.Piston in the utility model under silk cable and SMA under the collective effect of silk cable, has good Self-resetting effect on upper secondary spring, lower secondary spring, SMA.

Description

A SMA self-resetting variable friction damping device

technical field

The utility model specifically relates to an SMA self-resetting variable friction damping device.

Background technique

In order to reduce the dynamic response and damage accumulation of civil engineering structures under the action of earthquakes, strong winds and other disasters, vibration damping devices can be added to the structure to dissipate external input energy and protect the safety of the main structure. The friction damper is simple in structure, easy to install, and its energy dissipation performance is not affected by temperature. It is a kind of energy dissipation and vibration reduction device commonly used in building structures. However, the traditional friction damper has a single structure, and its positive pressure and friction coefficient on the friction surface cannot be changed by itself, and it has no self-resetting ability. As a new type of material, shape memory alloy (SMA) has developed rapidly in the research and application of anti-seismic aspects of civil engineering. SMA has unique shape memory effect and superelastic properties. In addition, dampers designed using the superelastic effect of shape memory alloys have better durability and corrosion resistance, allowing large deformation and recoverable deformation, but the equivalent viscous damping of SMA is not enough to make it the only damping device.

Utility model content

The purpose of the utility model is to provide an SMA self-reset variable friction damping device.

The concrete technical scheme of the utility model is as follows:

An SMA self-resetting variable friction damping device, comprising

An outer cylinder, the upper end cover is provided with an upper cylinder cover, the lower end cover is provided with a lower cylinder cover, the inner diameter of the inner cavity gradually decreases from the middle to the upper and lower ends, the upper cylinder cover has a through hole, and the lower cylinder cover has a connection joint;

A piston, the upper end of which is provided with a sliding shaft, the outer wall of which is surrounded by an elastic layer, and several friction plates are arranged on the elastic layer along the circumference of the piston;

One auxiliary spring;

Click on the auxiliary spring;

Several SMA upper wire cables;

and several SMA lower wires;

The piston is slidingly arranged in the inner cavity of the outer cylinder through its elastic layer and several friction plates; the sliding shaft runs through the through hole of the upper cylinder head; the upper auxiliary spring is sleeved on the sliding shaft, and its upper end is against the upper cylinder Piston; the upper end of the lower auxiliary spring is against the piston, and the lower end is against the lower cylinder head; the upper end of several SMA upper wire cables is connected to the upper cylinder head, and the lower end is connected to the piston; the upper end of several SMA lower wire cables is connected to the piston, and the lower end is connected to the lower cylinder head.

In a preferred embodiment of the present invention, the upper end of the piston has a piston upper end plate, the sliding shaft is arranged on the piston upper end plate, the lower end of the upper auxiliary spring is against the piston upper end plate, the piston Several upper fixing rings are also arranged on the upper end plate to connect the lower ends of the several SMA upper wire cables.

Further preferably, the lower surface of the upper cylinder head is provided with a sliding shaft positioning stopper, the sliding shaft passes through the sliding shaft positioning stopper to ensure that the sliding shaft moves in the axial direction, and the upper end of the upper auxiliary spring abuts against the sliding shaft positioning stopper. Sliding shaft positioning stops.

In a preferred embodiment of the present utility model, the lower end of the piston has a piston lower end plate, the upper end of the lower auxiliary spring is pressed against the piston lower end plate, and several lower fixing rings are arranged on the piston lower end plate to connect The upper ends of the several SMA lower wire cables.

Further preferably, a spring support is provided on the upper surface of the lower cylinder head, and the lower end of the lower auxiliary spring presses against the spring support.

The beneficial effects of the utility model are:

1. The SMA self-resetting variable friction damping device of the present invention has simple structure, low cost, stable performance, and is detachable, so it is easy to replace when the internal parts of the damper are damaged.

2. The inner diameter of the middle part of the outer cylinder of the SMA self-resetting variable friction damping device of the present invention is slightly larger than other parts, the greater the movement range of the piston relative to the initial position, the greater the friction force generated, and the better the frictional energy consumption effect .

3. In the SMA self-resetting variable friction damping device of the present invention, the piston is connected with an auxiliary spring and an SMA wire cable, which has a good self-resetting effect.

Description of drawings

Fig. 1 is a structural sectional view of the utility model.

Fig. 2 is a sectional view along A-A of Fig. 1 .

Fig. 3 is a top view of the utility model.

Fig. 4 is the bottom view of the utility model.

Detailed ways

The technical solutions of the present utility model will be further illustrated and described below through specific embodiments in conjunction with the accompanying drawings.

As shown in Figures 1 to 4, an SMA self-resetting variable friction damping device includes an outer cylinder 1, a piston 2, an upper auxiliary spring 3, a lower auxiliary spring 4, several SMA upper wire cables 5 and several SMA Lower the silk cable 6. The piston 2 has a good self-resetting effect under the joint action of the upper auxiliary spring 3 , the lower auxiliary spring 4 , the SMA upper wire cable 5 and the SMA lower wire cable 6 .

Outer cylinder 1, its upper end cover is provided with an upper cylinder cover 11, and its lower end cover is provided with a lower cylinder cover 12, which are respectively connected with the outer cylinder 1 through grub screws 13, and the inner diameter of the inner cavity gradually decreases from the middle to the upper and lower ends. Small (preferably gradually decreasing from the middle up and down in an arc shape), the upper cylinder cover 11 has a through hole 110, and the lower cylinder cover 12 has a connecting joint 120;

The upper end of the piston 2 is provided with a sliding shaft 20 , and its outer wall is surrounded by an elastic layer 21 (preferably made of rubber). The elastic layer 21 is provided with a plurality of friction plates 22 along the circumference of the piston 2 .

As shown in Figures 1 and 2, the piston 2 is slidably disposed in the inner cavity of the outer cylinder 1 through its elastic layer 21 and several friction plates 22. When the piston 2 moves relative to the equilibrium position, the inner diameter of the outer cylinder 1 decreases The elastic layer 21 can generate compression, and there are gaps 220 between the friction plates 22 to ensure that when the piston 2 moves, there is no contact between adjacent friction plates 22 to prevent the piston 2 from locking up, and the outer surfaces of the friction plates 22 are along the The axial direction of the outer cylinder 1 is curved, forming a sliding surface with the inner wall of the outer cylinder 1. The larger the movement range of the piston 2 relative to the initial position, the greater the friction force generated, and the better the frictional energy dissipation effect; The shaft 20 runs through the through hole 110 of the upper cylinder head 11; the upper auxiliary spring 3 is sleeved on the sliding shaft 20, and its upper end is against the upper cylinder head 11, and its lower end is against the piston 2; the upper end of the lower auxiliary spring 4 is against the piston 2, and the lower end is against the piston 2. Push against the lower cylinder head 12; the upper ends of several SMA upper wire cables 5 are connected to the upper cylinder head 11, and the lower ends are connected to the piston 2; the upper ends of several SMA lower wire cables 6 are connected to the piston 2, and the lower ends are connected to the lower cylinder head 12. Several SMA upper wires 5 and several SMA lower wires 6 are parallel to the axis of the outer cylinder 1 and distributed symmetrically at equal intervals along the circumference of the piston 2 .

Preferably, as shown in Fig. 1, the upper ends of the several SMA upper wire cables 5 are connected with several upper connecting mechanisms 111 arranged on the upper cylinder head 11, and each upper connecting mechanism 111 includes an upper fixing nut 1111 and an upper fixing nut 1111. The bolt 1112 and the upper fixing nut 1111 are arranged outside the upper cylinder head 11, and are adapted to the upper end of the upper fixing bolt 1112. The upper fixing bolt 1112 penetrates and fits the threaded through hole pre-set on the upper cylinder head 11, and the SMA upper wire cable 5 The upper end of the upper end is connected with the lower end of the upper fixing bolt 1112 . The lower ends of the several SMA lower wire cables 6 are connected with several lower connecting mechanisms 121 arranged on the lower cylinder head 12, each lower connecting mechanism 121 includes a lower fixing nut 1211 and a lower fixing bolt 1212, and the lower fixing nut 1211 is arranged on the lower cylinder head 12 outside, and adapt to the lower end of the lower fixing bolt 1212, the lower fixing bolt 1212 penetrates through the threaded through hole pre-set on the lower cylinder head 12, and the lower end of the SMA lower wire cable 6 is connected to the upper end of the lower fixing bolt 1212.

The upper end of the piston 2 has a piston upper end plate 23, the sliding shaft 20 is arranged on the piston upper end plate 23, the lower end of the upper auxiliary spring 3 pushes against the piston upper end plate 23, and the piston upper end plate 23 is also Several upper fixing rings 230 are provided to connect the lower ends of the several SMA upper wire cables 5 . The lower surface of the upper cylinder head 11 is provided with a sliding shaft positioning block 112, the sliding shaft 20 runs through the sliding shaft positioning block 112 to ensure that the sliding shaft 20 moves in the axial direction, and the upper end of the upper auxiliary spring 3 pushes The stop 112 is positioned against the slide shaft.

The lower end of the piston 2 has a piston lower end plate 24, the upper end of the lower auxiliary spring 4 pushes against the piston lower end plate 24, and the piston lower end plate 24 is also provided with a plurality of lower fixing rings 240 to connect the plurality of SMA lower end plates. The upper end of the silk cable 6. A spring support 122 is provided on the upper surface of the lower cylinder head 12 to support the lower auxiliary spring 4 , and the lower end of the lower auxiliary spring 4 is against the spring support 122 .

The above is only a preferred embodiment of the utility model, so the scope of implementation of the utility model cannot be limited accordingly, that is, the equivalent changes and modifications made according to the patent scope of the utility model and the contents of the specification should still belong to Within the scope covered by the utility model.

Claims (5)

1. a kind of SMA Self-resetting becomes friction damping device, it is characterised in that: including

One outer cylinder, the upper end are covered with a upper cylinder cover, and lower cover is equipped with cylinder cap, and the internal diameter of inner cavity is upward from centre Lower both ends are gradually reduced, and upper cylinder cover has a through-hole, and lower cylinder cap has a jointing；

One piston, the upper end are equipped with a sliding axle, and lateral wall is surrounded with posterior limiting, and the circumferential direction on the elastic layer along piston is set There are several friction plates；

Secondary spring on one；

Secondary spring once；

Silk cable on several SMA；

With silk cable under several SMA；

Piston is slideably positioned in the inner cavity of outer cylinder by its elastic layer and several friction plates；Sliding axle is through the logical of upper cylinder cover Hole；Upper secondary spring is socketed sliding axle, and the upper end contact upper cylinder cover, lower end contact piston；The upper end contact of lower secondary spring Piston, cylinder cap under the contact of lower end；The upper end of silk cable connects upper cylinder cover on several SMA, and lower end connects piston；Silk cable under several SMA Upper end connect piston, lower end connects lower cylinder cap.

2. a kind of SMA Self-resetting as described in claim 1 becomes friction damping device, it is characterised in that: the upper end of the piston With a piston upper head plate, the sliding axle is set on the piston upper head plate, the lower end contact of the upper secondary spring piston Upper head plate is additionally provided with several upper fixed rings to connect the lower end of silk cable on several SMA on the piston upper head plate.

3. a kind of SMA Self-resetting as claimed in claim 2 becomes friction damping device, it is characterised in that: under the upper cylinder cover Surface is equipped with a sliding axle position block, and the sliding axle guarantees sliding axle along axial fortune through the sliding axle position block It is dynamic, the upper end contact of the upper secondary spring sliding axle position block.

4. a kind of SMA Self-resetting as described in claim 1 becomes friction damping device, it is characterised in that: the lower end of the piston With a piston plate, the upper end contact of lower secondary spring piston plate, if being additionally provided on the piston plate Lower fixed ring is done to connect the upper end of silk cable under several SMA.

5. a kind of SMA Self-resetting as claimed in claim 4 becomes friction damping device, it is characterised in that: the lower cylinder cap it is upper Surface is equipped with a spring fastening, the lower end contact of the lower secondary spring spring fastening.