CN111255107A - A double-rod friction damper - Google Patents

Abstract

The invention discloses a double-out rod type friction damper, wherein a sliding shaft is movably penetrated in an outer sleeve, two ends of the sliding shaft protrude from both ends of the outer sleeve, and the surface of the sliding shaft is a friction damper with a certain friction system. friction surface; a number of friction sliders are distributed along the circumference of the sliding shaft, and the friction base surface of each friction slider forms a sliding friction fit with the surface of the sliding shaft; the extrusion ring is respectively sleeved on a number of friction sliders distributed along the circumference of the sliding shaft The inner surface of each extrusion ring is in synchronous contact with the arc slopes on a number of friction sliders, and the outer surface is in contact with the inner wall of the outer sleeve; the limit spring is arranged relative to the extrusion ring, and the The ring forms a pre-pressure facing the friction slide. The friction damper that can slide in both directions can replace the conventional friction damper, and can also be used in flexible connections, such as the cable of the cable structure.

Description

A double-rod friction damper

technical field

The invention relates to a building shock absorption scheme, in particular to a damper.

Background technique

At present, the dampers mainly include metal dampers, viscous dampers, viscoelastic dampers and friction dampers. Among them, friction dampers are widely used because of their simple principle, convenient structure and low price. A friction damper is an energy-consuming shock absorbing device that uses the friction of the friction surface to dissipate vibration energy. Conventional friction dampers are used in the connection of rigid components, and the frictional energy dissipation of the friction surface of the damper is driven by the movement of the rigid rod. When it is a flexible structure or flexible connection, conventional dampers are not suitable.

The interlayer deformation of buildings under the action of earthquake or wind load is small, generally 5mm to 40mm, and the maximum stroke of the damper can generally reach 100mm to 200mm, and the stroke of the friction damper can be designed according to the actual situation. The ordinary connection form cannot make full use of the stroke of the damper, and the damping effect of the damper cannot be fully exerted.

For example, the patent application with publication number CN101216088A discloses a cylindrical variable friction damper. The damper is mainly composed of an outer sleeve, an inner sleeve, a sliding shaft, a disc spring, a lock nut, an extruded cone ring, and a friction slider. , the left end plate and the hinged right end plate cooperate to form. The novelty of the barrel-type variable friction damper and the conventional friction damper is that variable friction can be realized, so when the damper adopts a flexible connection or is used in a flexible structure, the damper cannot be applied. At the same time, the damper can generally only be used for common connection forms. Due to the relatively small deformation of the building, the common connection form cannot fully utilize the stroke of the damper, and the damping effect of the damper cannot be fully exerted.

SUMMARY OF THE INVENTION

In view of the problem that the existing dampers cannot be used in flexible connection structures, a new damper solution is required.

Therefore, the purpose of the present invention is to provide a double-rod friction damper, which can not only replace the conventional friction damper, but also be used in flexible connection.

In order to achieve the above purpose, the double-rod friction damper provided by the present invention includes an outer sleeve, a sliding shaft, a friction slider, a squeeze ring and a limit spring; the sliding shaft is movably passed through the outer sleeve , its two ends protrude from both ends of the outer sleeve, the surface of the sliding shaft is a friction surface with a certain friction system; the inner surface of the friction slider is a friction base surface that matches the surface of the sliding shaft, and the outer surface is a friction surface with a certain friction system. It is a symmetrically distributed arc slope, a number of friction sliders are distributed along the circumference of the sliding shaft, and the friction base surface of each friction slider forms a sliding friction fit with the surface of the sliding shaft; The topless conical surface matched with the arc inclined surface on the block; the extrusion rings are respectively sleeved on the two ends of several friction sliders distributed along the circumferential direction of the sliding shaft, and the inner surface of each extrusion ring is connected with several friction sliders. The arc inclined surfaces on the upper surface are in synchronous contact and fit, and the outer surface is in contact and fit with the inner wall of the outer sleeve; the limit spring is arranged relative to the extrusion ring and forms a pre-pressure for the extrusion ring facing the friction slider.

Further, both ends of the outer sleeve are provided with guide rings matched with the sliding shaft.

Further, both ends of the sliding shaft are provided with earrings.

The present invention provides a bidirectionally slidable friction damper, which can replace conventional friction dampers or be used for flexible connections. The friction damper has a two-way sliding function, which can effectively amplify the displacement of the damper and increase energy consumption. For example, in application, its two movable ends are connected to the component through a cable, and the cable arrangement can span a certain number of layers according to the actual deformation requirements. Or height, so as to increase the relative displacement of the cable, and the damper is directly connected to the cable, and the displacement is consistent with the cable, so the displacement of the damper can be amplified by the cable to increase the energy consumption.

Furthermore, the friction damper can slide in both directions, and can also be used in components that have bidirectional sliding deformation requirements, such as stay cables of cable structures, cables of cable-stayed bridges, and the like. The damper can be directly connected to both ends of the cable through two movable ends, and the damper replaces part of the cable, so that it can be a part of the cable and can also realize energy dissipation and shock absorption.

Furthermore, the friction damper provided by the present invention can slide in both directions, the friction damping force is constant, the energy dissipation capacity increases with the increase of the deformation amplitude, and the reliability is high.

Description of drawings

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

Fig. 1 is the overall structure diagram of the double-out rod type friction damper in this example;

Fig. 2 is the A-A sectional view of the double-out rod type friction damper shown in Fig. 1;

Fig. 3 is the B-B sectional view of the double-rod friction damper shown in Fig. 1;

Fig. 4 is the C-C sectional view of the double-rod friction damper shown in Fig. 1;

Fig. 5 is the overall structure diagram of the spiral limit spring double-rod friction damper given in this example;

FIG. 6 is an example diagram of the application of the double-out rod type friction damper in a conventional building structure in this example;

FIG. 7 is an example diagram of the application of the double-rod friction damper in the cable-stayed bridge and other cable structures in this example;

FIG. 8 is an example diagram of applying the double-rod friction damper in this example to a shock absorbing device in which a cable is connected to the damper.

Detailed ways

In order to make it easy to understand the technical means, creation features, achieved goals and effects of the present invention, the present invention will be further described below with reference to the specific figures.

Referring to FIG. 1, it shows an example of the composition of the double-rod friction damper given in this example.

As can be seen from the figure, the double-rod friction damper is mainly composed of an outer sleeve 1 , a sliding shaft 6 , a friction slider 3 , an extrusion ring 2 and a limit spring 7 that cooperate with each other.

Wherein, the outer sleeve 1 constitutes the main body of the entire friction damper, and the whole is a cylindrical structure with a cavity inside, which is preferably cylindrical in this example, which is convenient for installation. Furthermore, both ends of the outer sleeve 1 have end plates 11 , and through holes for allowing the sliding shaft 6 to pass through are symmetrically formed on the end plates 11 at both ends.

Further, in this example, annular guide rings 8 are respectively provided in the through holes on the end plates 11 at both ends to reduce the friction between the sliding shaft 6 and the rod outlet at both ends, and avoid the movement of the middle pull rod during the movement process. The deflection occurs in the sleeve, resulting in uneven contact between the friction blocks in the sleeve and stable friction force.

The sliding shaft 6 in the friction damper is used as a friction sliding component connected to the outside, which is integrally penetrated in the outer sleeve 1 through the guide rings 8 on both ends of the outer sleeve 1, and the two ends of the sliding shaft 6 are guided through the outer sleeve 1 respectively. The ring 8 protrudes out of the outer sleeve 1 .

The sliding shaft 6 is made of stainless steel, high-strength steel, copper and other materials as a whole, and its surface is surface-treated to form a friction surface with a certain friction coefficient to perform sliding frictional cooperation with the friction slider 3 to absorb vibration energy.

Furthermore, in this example, connecting earrings 9 are respectively provided at both ends of the sliding shaft 6 passing through the outer sleeve 1, and the connecting earrings 9 at both ends can be respectively connected with the components that require energy consumption, or one end can be connected to the components requiring energy consumption. connected, the other end is left empty.

The friction sliding block 3 in the friction damper is used to directly frictionally cooperate with the sliding shaft 6 to realize vibration energy absorption.

Referring to Figures 1 to 3, the friction slider 3 is in the shape of an arc as a whole, the inner surface of which is formed with an arc-shaped friction base layer 5 that matches the surface of the sliding shaft, and the outer surface is inclined from the middle to both sides The friction slide block 3 with such a structure can make the slide block slide inward stably through the circular arc inclined surface on it, so as to ensure the stability of the pre-extrusion force.

As an example, in order to ensure the strength of the friction slide block 3, the friction slide block 3 is preferably made of steel to form the base body of the friction slide block 3, and the overall structure of the base body satisfies the scheme shown in the figure; Corresponding arc-shaped friction base layer.

When the friction slider 3 with such a structure is matched with the sliding shaft 6, multiple friction sliders 3 are used, and the multiple friction sliders 3 are distributed along the circumferential direction of the sliding axis, and there is a certain amount between adjacent friction sliders 3. There is a gap 4, whereby the plurality of friction sliders 3 are annularly distributed on the outer circumference of the sliding shaft, and the arc-shaped friction base surface layer 5 of each friction slider is directly in contact with the friction surface of the sliding shaft 6, thereby forming At the same time, the symmetrical circular arc inclined surfaces 10 of each friction slider face the two ends of the outer sleeve 1 respectively. The inner side of the friction slider 3 is the friction surface. In order to ensure the stable contact between the friction surface and the intermediate shaft and maintain a certain pressing force, the slider 3 is divided into multiple parts along the circumferential direction. Regular polygon.

The number of friction sliders 3 selected can be determined according to actual needs, and can be two or more. As an example, four friction sliders 3 are used in the illustrated case, and the outer circumference of the sliding shaft is annularly distributed. Therefore, the reliability and stability of the friction fit can be ensured.

For the above friction sliders 3, in this example, the pre-pressure is formed on both ends of all the friction sliders 3 through the cooperation of the extrusion ring 2 and the limit spring 7, so that the arc-shaped friction base surface layer 5 of all the friction sliders 3 is formed. It is directly in contact with the friction surface of the sliding shaft 6; at the same time, the pressure formed on both ends of the friction slider 3 can be linearly adjusted according to the moving direction and stroke of the friction slider 3.

Specifically, the extrusion ring 2 in this example is a circular ring as a whole, and its inner surface is a topless conical surface matched with the circular arc slope 10 on the friction slider 3, that is, the inclination slope of the inner surface of the extrusion ring 2 is the same as The arc slope 10 on the friction slider 3 is the same; and the outer surface of the extrusion ring 2 is an arc plane.

The extrusion rings 2 with such a structure are respectively sleeved on both ends of a plurality of friction sliders 3 distributed annularly along the circumferential direction of the sliding shaft. The synchronous surfaces of the circular arc inclined surfaces at one end of the friction sliders 3 distributed in the shape of a plurality of friction sliders 3 are in contact with each other, and the outer surface of the extrusion ring 2 is in contact with the inner wall of the outer sleeve. In this way, the inner wall of the outer sleeve guides and limits the movable direction of each extruding ring 2 , and each extruding ring 2 is formed between the conical surface on its inner side and the arc inclined surface at one end of several friction sliders 3 . When the relative axial movement is performed with the friction slider 3, the arc slope at one end of the several friction sliders 3 in contact can simultaneously form a pressure facing the sliding shaft 6 (radial direction).

The limit springs 7 here are specifically arranged relative to the extruding rings 2 to form a pre-pressure for each extruding ring 2 facing the friction slider 3 .

In order to effectively limit the position of the extrusion rings 2 sleeved on the two ends of the friction sliders 3 , two sets of limit springs 7 are preferred in this example. between the two extruding rings 2 at the end and the end plate 11 of the outer sleeve 1 , so that the two extruding rings 2 located at both ends of the friction slider 3 are synchronously formed from both sides to form a pre-pressure.

As shown in Figures 1 and 4, each set of limit springs 7 includes a plurality of limit springs 7, and the plurality of limit springs 7 are distributed along the circumference of the sliding shaft 6 relative to the extrusion ring 2. Each limit spring One end of the 7 is connected with the extrusion ring 2, and the other end is in contact with the end plate 11 of the outer sleeve 1, and each limit spring 7 is in a pre-compressed state under normal conditions.

The number of limit springs 7 in each set of limit springs 7 can be determined according to actual needs, and this example preferably corresponds to the number of friction sliders 3 used. That is, referring to Figures 2 and 4, four friction sliders 3 are used in the illustrated case, so in this case, four limit springs 7 are used in each group, and the distribution position of each limit spring 7 corresponds to each friction block. The center position of slider 3. The limit spring set here is used to maintain the pressing force of the upper part of the slider 3; at the same time, the symmetrical arrangement of the limit spring can ensure the stable output of the spring and the stable pressing force on the slider. It won't get stuck when moving fast.

As an alternative solution, each set of limit springs 7 may also be constituted by one limit spring 7 . Referring to FIG. 5 , a helical limit spring 7 may be used to be disposed between the extruding ring 2 and the end plate 11 of the outer sleeve 1 to limit and preload the extruding ring 2 . The coil limit spring 7 is integrally sleeved on the sliding shaft 6 , one end of which is in contact with the end surface of the extrusion ring 2 , and the other end is in contact with the end plate 11 of the outer sleeve 1 . This alternative uses a helical spring, which is more convenient to manufacture, and at the same time obtains a greater pressing force.

In the double-rod friction damper constructed based on the above solution, the sliding shaft 6 is integrally movably inserted in the outer sleeve to form two movable ends, which can be respectively connected to the components requiring energy consumption. The sliding shaft can slide in both directions in the axial direction. When the outer sleeve and the sliding shaft move relatively in the axial direction, the outer peripheral friction surface of the sliding shaft and the friction base surface of the friction block rub against each other to absorb vibration energy. Since the limit spring is against the extrusion ring, the positive pressure and contact area on the friction resistance contact surface remain unchanged, the friction damping force is constant, and the energy dissipation capacity increases with the increase of the deformation amplitude.

The double-rod friction damper given in this example can replace conventional friction dampers and can also be used in flexible connections in specific applications, so that it can be applied to building structure vibration reduction, building cable structure vibration reduction and cable-stayed bridges. or suspension bridge vibration reduction.

Referring to FIG. 6 , it shows an example of applying the present double-rod friction damper to a conventional building structure.

It can be seen from the figure that when the damper is used in the design of conventional structural shock absorption, the outer sleeve 1 of the damper can be fixed on the building structure, one end is connected to the component, and the other end is vacant, the structure is under earthquake or wind. Under the action of the load, the sliding shaft 6 in the damper dissipates energy by sliding in the axial direction.

Since the double-rod friction damper can be used in flexible connection, a shock absorbing device connected with a cable and the damper can be used to increase the relative deformation of both ends of the damper, make full use of the stroke of the damper, and greatly improve the shock absorption efficiency.

Referring to FIG. 7 , it shows an example of applying the double-rod friction damper of this example to a cable-stayed bridge and other cable structures.

It can be seen from the figure that when the double-rod friction damper 12 is used in a cable-stayed bridge and other cable structures, its two movable ends 9 can be connected to the components through the cable 13, and the damper 12 can be amplified through the cable 13. Displacement increases energy consumption, and can also be used for building cable structures or cable bridges in local areas where the damper 12 replaces the cables to achieve energy dissipation and shock absorption.

Referring to FIG. 8 , it shows an example of applying the double-rod friction damper of this example to a shock absorbing device in which a cable is connected to the damper.

In the shock absorbing device connected with the cable and the damper, the friction damper 12 is provided at suitable positions such as the upper, middle or bottom of certain floors of the building. The cable 13 and the fixed pulley 14 that is fixed on the building are connected together with other several or more dampers 12 arranged in different positions.

As a result, the building is deformed between floors under the action of earthquake or wind load, and the relative deformation at both ends of the damper is the sum of the inter-story deformation of each floor, so a large amount of energy input into the main structure can be consumed to achieve a large damping effect. The damper in the shock absorption device connected with the cable and the damper is flexible in arrangement, and has little influence on the function of the building and the appearance of the building. At the same time, the expected shock absorption can be achieved by setting the number of spanning floors and the number of dampers of the shock absorption device

The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and the descriptions in the above-mentioned embodiments and the description are only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have Various changes and modifications fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (3)

1. The double-rod type friction damper is characterized by comprising an outer sleeve, a sliding shaft, a friction sliding block, an extrusion ring and a limiting spring; the sliding shaft is movably arranged in the outer sleeve in a penetrating way, two ends of the sliding shaft extend out of two ends of the outer sleeve, and the surface of the sliding shaft is a friction surface with a certain friction system; the inner surface of each friction sliding block is a friction base surface matched with the surface of the sliding shaft, the outer surface of each friction sliding block is an arc inclined surface which is symmetrically distributed, the friction sliding blocks are distributed along the circumferential direction of the sliding shaft, and the friction base surface of each friction sliding block is in sliding friction fit with the surface of the sliding shaft; the inner surface of the extrusion ring is a de-vertex conical surface matched with the arc inclined surface on the friction sliding block; the extrusion rings are respectively sleeved at two ends of a plurality of friction sliding blocks distributed along the circumferential direction of the sliding shaft, the inner surface of each extrusion ring is synchronously contacted and matched with the arc inclined surfaces on the friction sliding blocks, and the outer surface of each extrusion ring is contacted and matched with the inner wall of the outer sleeve; the limiting spring is arranged relative to the extrusion ring and forms pre-pressure facing the friction sliding block on the extrusion ring.

2. The double out-rod friction damper of claim 1, wherein the outer sleeve is provided at both ends with guide rings that engage the sliding shaft.

3. The double-stick friction damper according to claim 1, wherein both ends of the sliding shaft are provided with earrings.

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