US20190024369A1

US20190024369A1 - Cushioning mechanism

Info

Publication number: US20190024369A1
Application number: US16/036,977
Authority: US
Inventors: Yuhong Ma
Original assignee: Guangzhou University
Current assignee: Guangzhou University
Priority date: 2017-07-18
Filing date: 2018-07-17
Publication date: 2019-01-24
Also published as: CN107489093A; CN107489093B

Abstract

The invention provides a cushioning mechanism comprising a base, an equal-width cam mechanism, a limiting bracket, a ball screw, two groups of energy dissipaters and energy dissipater fixing bases, wherein the equal-width cam mechanism, the limiting bracket, the ball screw, the two groups of energy dissipaters and the energy dissipater fixing bases are mounted on the base. The equal-width cam mechanism comprises a quadrilateral frame and a cam mounted in the quadrilateral frame. The cam is connected with a nut of the ball screw. The two groups of energy dissipaters are mounted on the energy dissipater fixing bases on the two sides of the equal-width cam mechanism separately. The ends, away from the energy dissipater fixing bases, of the two groups of energy dissipaters are connected with the two sides of the quadrilateral frame separately. The invention is low in manufacturing cost and good in buffering and limiting effect.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS

The present application claims priority from Chinese application No. 201710584380.1 filed on 2017 Jul. 18 which is hereby incorporated herein by reference in its entirety.

TECHNICAL FIELD

The invention relates to the technical field of seismic mitigation and damping of building structure and bridge structure, in particular to a cushioning mechanism of building structure and bridge structure.

BACKGROUND OF THE INVENTION

Earthquake is one of the most common natural disasters. A strong earthquake will seriously damage the building structure and bridge structure, causing a large number of casualties and economic losses. Seismic isolation technology is economical and efficient, so it has been widely used in the engineering community. When the isolated structure encounters an extremely rare earthquake, the horizontal displacement of the seismic isolation bearing is likely to exceed the limit design value, causing great destruction and seriously threatening the safety of life and property. Therefore, it is necessary to adopt the necessary buffering and limiting measures for the seismic isolation layer to limit the horizontal displacement to a safe range. In the damping technology of building structure and bridge structure, the energy dissipaters are needed for the seismic isolation technology to limit the displacement of the seismic isolation layer and for the energy dissipation and damping technology to dissipate the earthquake energy. When a displacement-related energy dissipater such as a friction energy dissipater or a metal yield energy dissipater is adopted or a speed-dependent energy dissipater such as a viscous liquid energy dissipater or a viscoelastic energy dissipater is adopted, if the displacement or the speed of the energy dissipater is small, it is difficult to exert an effective energy dissipation capability; otherwise, a energy dissipater with large-tonnage and large-distance is required, so that the manufacturing cost is high.
Therefore, it is necessary to develop a buffering and limiting device with good energy dissipation capability in a limited displacement.

BRIEF SUMMARY OF THE INVENTION

The object of the present invention is to overcome the problems existing in the prior art that when a displacement-related energy dissipater such as a friction energy dissipater or a metal yield energy dissipater is adopted or a speed-dependent energy dissipater such as a viscous liquid energy dissipater or a viscoelastic energy dissipater is adopted, if the displacement or the speed of the energy dissipater is small, it is difficult to exert an effective energy dissipation capability; otherwise, a energy dissipater with large-tonnage and large-distance is required, so that the manufacturing cost is high.
To solve the above-mentioned problems, the invention provides a cushioning mechanism, comprising a base, an equal-width cam mechanism, a limiting bracket, a ball screw, two groups of energy dissipaters and energy dissipater fixing bases, wherein the equal-width cam mechanism, the limiting bracket, the ball screw, the two groups of energy dissipaters and the energy dissipater fixing bases are mounted on the base. The equal-width cam mechanism comprises a quadrilateral frame and a cam mounted in the quadrilateral frame. The cam is connected with a nut of the ball screw. The two groups of energy dissipaters are mounted on the energy dissipater fixing bases on the two sides of the equal-width cam mechanism separately. The ends, away from the energy dissipater fixing bases, of the two groups of energy dissipaters are connected with the two sides of the quadrilateral frame separately. The limiting bracket is mounted on the periphery of the equal-width cam mechanism. The cam mechanism performs linear reciprocating motions between the two groups of energy dissipaters under the limit of the limiting bracket. The end, away from the equal-width cam mechanism, of the ball screw is provided with a spring latch assembly used for being connected with a building structure or a bridge structure. Said spring latch assembly comprises a spring latch and a latch shell. Said latch shell is movably sleeved outside the spring latch, and bolt holes which are matched with the spring latch is mounted in the two sides of said latch shell.
As an improvement of the technical proposal, said limiting bracket comprises an upper limiting baffle and two side limiting baffles. Said upper limiting baffle is fixedly connected between two said side limiting baffles and covers the top of them.
As an improvement of the technical proposal, a sliding chute is set up in the middle of said upper limiting baffle; the top of said quadrilateral frame is slidingly connected into said sliding chute.
As an improvement of the technical proposal, the two sides of said quadrilateral frame are respectively provided with a first connecting buckle connected with said energy dissipaters.
As an improvement of the technical proposal, said cam is clamped between two said nuts. Opposite to the reverse side of the cam, a thrust bearing is respectively set up on the two nuts.
As an improvement of the technical proposal, said base is provided with a plurality of mounting holes.
As an improvement of the technical proposal, second connecting buckles are arranged at the top of said energy dissipater fixing bases. Said second connecting buckles and the first connecting buckles on the quadrilateral frame are arranged on the same horizontal height.
As an improvement of the technical proposal, said side limiting baffles are provided with one or more fixing stiffening ribs for supporting said side limiting baffles.
The invention provides a cushioning mechanism. Compared with the prior art, it has the following beneficial effects.
1. A salient feature of the invention is that the energy dissipaters always have a limited reciprocating displacement within the allowable range. The invention designs a ball screw and an equal-width cam mechanism, and when the building structure or the bridge structure generates a large horizontal displacement under the rarely occurred earthquake and extremely rare earthquake, the spring latch moves to the maximum displacement, the spring latch and the bolt holes on the latch shell are locked, which will push the ball screw to move axially. The ball screw converts the horizontal motion into a rotary motion and drives the equal-width cam to move. The equal-width cam mechanism converts the rotary motion into a reciprocating linear motion, so that the energy dissipaters are always in a reciprocating linear motion within a limited distance, and the energy dissipaters can be prevented from being damaged or losing effect due to the fact that the displacement is over-limited.
2. The invention has a good effect of force amplification. By reasonably designing the cam and adjusting the eccentric distance, the acting force provided by the energy dissipaters can realize amplification, and the amplification effect can even reach ten or dozens of times.
3. The invention has a great buffering and limiting effect. In the case of frequently occurred earthquake, the relative displacement between the spring latch and the bolt holes on the latch shell is small, the spring latch and the bolt holes on the latch shell are not locked, and the energy dissipaters will not function; in rarely occurred earthquake and extremely rarely occurred earthquake, the relative displacement between the spring latch and the bolt holes on the latch shell reaches to the maximum, the spring latch and the bolt holes on the latch shell are locked, and the energy dissipaters will act to achieve better energy dissipation and damping, and to realize the buffering and limiting effect.
The invention has wide application range and can greatly reduce the manufacturing cost. The invention can be combined with various cushioning devices. The device can achieve the effect of the large-tonnage energy dissipater by using a small-tonnage energy dissipater to realize the amplification, thereby greatly reducing the cost. In the process of designing and manufacturing, the device only needs to be made into steel plate or concrete structure according to design requirements, and the design is simple and convenient, and the cost is low. The cushioning mechanism is a useful supplement and improvement for the existing control technique of building and bridge structure, and greatly reduces the cost while ensuring that the energy dissipater does not fail to achieve buffering effects, thereby having a good development and application prospect.

BRIEF DESCRIPTION OF THE DRAWINGS

For better explain the technical proposal in the present invention embodiments, the drawings to be used in the description of the embodiments will be briefly described below.

FIG. 1 is a schematic structural diagram of the cushioning mechanism provided by an embodiment of this invention;

FIG. 2 is a a cross-sectional view of the cushioning mechanism provided by an embodiment of this invention;

FIG. 3 is a schematic structural diagram of the equal-width cam mechanism in an embodiment of this invention;

FIG. 4 is a connection diagram of the cushioning mechanism provided by another embodiment of this invention;

Among them, 1—ball screw; 11—nut; 12—thrust bearing; 13—spring latch assembly; 131—spring latch; 132—latch shell; 1321—bolt hole; 2—equal-width cam mechanism; 21—first connecting buckle; 22—quadrilateral frame; 23—cam; 3—energy dissipater; 31—energy dissipater fixing base; 32—second connecting buckle; 4—base; 41—mounting hole; 5—limiting bracket; 51—upper limiting baffle; 52—side limiting baffle; 521—stiffening rib; 61—first cushioning mechanism; 62—second cushioning mechanism; 7—building structure or bridge structure.

DETAILED DESCRIPTION OF THE INVENTION

The technical proposals in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are merely a part rather than all of the embodiments of the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiment of the present invention without creative efforts shall fall within the protection scope of the present invention.
Referring to FIG. 1 to FIG. 4, the invention provides a cushioning mechanism, comprising a base 4, an equal-width cam mechanism 2, a limiting bracket 5, a ball screw 1, two groups of energy dissipaters 3 and energy dissipater fixing bases 31, wherein the equal-width cam mechanism 2, the limiting bracket 5, the ball screw 1, the two groups of energy dissipaters 3 and the energy dissipater fixing bases 31 are mounted on the base 4. The equal-width cam mechanism 2 comprises a quadrilateral frame 22 and a cam 23 mounted in the quadrilateral frame 22. The cam 23 is connected with a nut 11 of the ball screw 1. The two groups of energy dissipaters 3 are mounted on the energy dissipater fixing bases 31 on the two sides of the equal-width cam mechanism 2 separately. The ends, away from the energy dissipater fixing bases 31, of the two groups of energy dissipaters 3 are connected with the two sides of the quadrilateral frame 22 separately. The limiting bracket 5 is mounted on the periphery of the equal-width cam mechanism 2. The cam 23 mechanism performs linear reciprocating motions between the two groups of energy dissipaters 3 under the limit of the limiting bracket 5. The end, away from the equal-width cam mechanism 2, of the ball screw 1 is provided with a spring latch assembly 13 used for being connected with a building structure or a bridge structure. Said spring latch assembly 13 comprises a spring latch 131 and a latch shell 132. Said latch shell 132 is movably sleeved outside the spring latch 131, and bolt holes 1321 which are matched with the spring latch 131 is mounted in the two sides of said latch shell 132. The invention provides a cushioning mechanism. Compared with the prior art, it has the following beneficial effects. 1. A salient feature of the invention is that the energy dissipaters 3 always have a limited reciprocating displacement within the allowable range. The invention designs a ball screw 1 and an equal-width cam mechanism 2, and when the building structure or the bridge structure generates a large horizontal displacement under the rarely occurred earthquake and extremely rare earthquake, the spring latch 131 moves to the maximum displacement, the spring latch 131 and the bolt holes 1321 on the latch shell 132 are locked, which will push the ball screw 1 to move axially. The ball screw 1 converts the horizontal motion into a rotary motion and drives the equal-width cam 23 to move. The equal-width cam mechanism 2 converts the rotary motion into a reciprocating linear motion, so that the energy dissipaters 3 are always in a reciprocating linear motion within a limited distance, and the energy dissipaters 3 can be prevented from being damaged or losing effect due to the fact that the displacement is over-limited. 2. The invention has a good effect of force amplification. By reasonably designing the cam 23 and adjusting the eccentric distance, the acting force provided by the energy dissipaters 3 can realize amplification, and the amplification effect can even reach ten or dozens of times. 3. The invention has a great buffering and limiting effect. In the case of frequently occurred earthquake, the relative displacement between the spring latch 131 and the bolt holes 1321 on the latch shell 321 is small, the spring latch 131 and the bolt holes 1321 on the latch shell 132 are not locked, and the energy dissipaters 3 will not function; In rarely occurred earthquake and extremely rarely occurred earthquake and extremely rare earthquake, the relative displacement between the spring latch 131 and the bolt holes 1321 on the latch shell 321 reaches to the maximum, the spring latch 131 and the bolt holes 1321 on the latch shell 321 are locked, and the energy dissipaters 3 will act to achieve better energy dissipation and damping, and to realize the buffering and limiting effect.
More preferably, in this embodiment, said limiting bracket 5 comprises an upper limiting baffle 51 and two side limiting baffles 52. Said upper limiting baffle 51 is fixedly connected between two said side limiting baffles 52 and covers the top of them, which makes the equal-width cam mechanism 2 operate more stably.
More preferably, in this embodiment, a sliding chute (not shown in the drawing) is set up in the middle of said upper limiting baffle 51; the top of said quadrilateral frame 22 is slidingly connected into said sliding chute.
More preferably, in this embodiment, the two sides of said quadrilateral frame 22 are respectively provided with a first connecting buckle 21 connected with said energy dissipaters 3.
More preferably, in this embodiment, said cam 23 is clamped between the two nuts 11. Opposite to the reverse side of said cam 23, two said nuts 11 are respectively mounted with a thrust bearing 12 to support the ball screw 1.
More preferably, in this embodiment, said base 4 is provided with a plurality of mounting holes 41, distributed at the edges of the base 44 for its installation.
More preferably, in this embodiment, said second connecting buckles 31 are arranged at the top of said energy dissipater fixing bases 3132. Said second connecting buckles 31 and the first connecting buckles 21 on the quadrilateral frame 22 are arranged on the same horizontal height. The distance between the first connecting buckles 21 and the second connecting buckles is determined by the size of the energy dissipater 33.
More preferably, in this embodiment, said side limiting baffles 52 are provided with one or more fixing stiffening ribs 521 for supporting said side limiting baffles 52, to ensure the stability of the whole mechanism.
It should be further noted that in another embodiment of present invention, two or more said cushioning mechanisms can be in a series connection with each other, to form a cushioning mechanism group 6. For example, two said cushioning mechanisms are in a series connection as shown in FIG. 4, wherein, the first cushioning mechanism 61 and the second cushioning mechanism 62 use the spring latch assembly 13 on the end of the ball screw 1 to connect a plurality of cams 23 together to complete the series. It should be noted in the series process that two adjacent cushioning mechanisms are connected by the spring latch assembly 13, where the displacement between the spring latch 131 and the bolt holes 1321 on the latch shell 132 is longer than the displacement between the spring latch 131 and the bolt holes 1321 on the latch shell 132 of the building structure and the bridge structure. The specifics are determined by the two-stage buffering and limiting distance.
The invention provides a cushioning mechanism. Compared with the prior art, it has the following beneficial effects. 1. A salient feature of the invention is that the energy dissipaters 3 always have a limited reciprocating displacement within the allowable range. The invention designs a ball screw 1 and an equal-width cam mechanism 2, and when the building structure or the bridge structure generates a large horizontal displacement under the rarely occurred earthquake and extremely rare earthquake, the spring latch 131 moves to the maximum displacement, the spring latch 131 and the bolt holes 1321 on the latch shell 132 are locked, which will push the ball screw 1 to move axially. The ball screw 1 converts the horizontal motion into a rotary motion and drives the equal-width cam 23 to move. The equal-width cam mechanism 2 converts the rotary motion into a reciprocating linear motion, so that the energy dissipaters 3 are always in a reciprocating linear motion within a limited distance, and the energy dissipaters 3 can be prevented from being damaged or losing effect due to the fact that the displacement is over-limited. 2. The invention has a good effect of force amplification. By reasonably designing the cam 23 and adjusting the eccentric distance, the acting force provided by the energy dissipaters 3 can realize amplification, and the amplification effect can even reach ten or dozens of times.
The invention has a great buffering and limiting effect. In the case of frequently occurred earthquake, the relative displacement between the spring latch 131 and the bolt holes 1321 on the latch shell 132 is small, the spring latch 131 and the bolt holes 1321 on the latch shell 132 are not locked, and the energy dissipaters 3 will not function; in rarely occurred earthquake and extremely rarely occurred earthquake, the relative displacement between the spring latch 131 and the bolt holes 1321 on the latch shell 132 reaches to the maximum, the spring latch 131 and the bolt holes 1321 on the latch shell 132 are locked, and the energy dissipaters 3 will act to achieve better energy dissipation and damping, and to realize the buffering and limiting effect.
The invention has wide application range and can greatly reduce the manufacturing cost. The invention can be combined with various cushioning devices. The device can achieve the effect of the large-tonnage energy dissipater by using a small-tonnage energy dissipater to realize amplification, thereby greatly reducing the cost. In the process of designing and manufacturing, the device only needs to be made into steel plate or concrete structure according to design requirements, and the design is simple and convenient, and the cost is low. The cushioning mechanism is a useful supplement and improvement for the existing control technique of building and bridge structure, and greatly reduces the cost while ensuring that the energy dissipater does not fail to achieve buffering effects, thereby having a good development and application prospect.
In the description of the invention, it shall be understood that the terms “upper”, “lower”, “left”, “right”, and the like indicate orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only in order to facilitate describing the present invention and to simplify the description, and not to indicate or imply that the indicated device or element must have a specific orientation, or a specific orientational structure and operation. Therefore, it shall not be understood that the present invention is restricted thereto. Furthermore, “first” and “second” are only for purposes of description, and cannot be understood to indicate or imply relative importance or to implicitly indicate the quantity of the indicated technical features. Therefore, the features defining the “first” and “second” can expressly or implicitly include one or more features. In the description of this invention, except as otherwise noted, the meaning of “a plurality of” is two or more.
In the description of the invention, it should be noted that unless explicitly stated and defined otherwise, the term “installed”, “is connected with”, “connected” and the like, should be understood in a broad sense. For example, it can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected or electrically connected; and can be directly connected, and can also be indirectly connected through an intermediate medium, or can be communicated with the inside of the two elements. For persons of ordinary skill on the art, the specific meaning of the terms in the invention can be understood according to specific situations.
The above are preferred embodiments of the invention, and it should be noted that for persons of ordinary skill on the art, any modification and improvement made without departing from the principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A cushioning mechanism comprises:

a base;

an equal-width cam mechanism, a limiting bracket, a ball screw, two groups of energy dissipaters and energy dissipater fixing bases mounted on the base,

wherein the equal-width cam mechanism comprises a quadrilateral frame and a cam mounted in the quadrilateral frame,

wherein the cam is connected with a nut of the ball screw;

wherein the two groups of energy dissipaters are mounted on the energy dissipater fixing bases on the two sides of the equal-width cam mechanism separately and the ends, away from the energy dissipater fixing bases, of the two groups of energy dissipaters are connected with the two sides of the quadrilateral frame separately;

wherein the limiting bracket is mounted on the periphery of the equal-width cam mechanism and the cam mechanism performs linear reciprocating motions between the two groups of energy dissipaters under the limit of the limiting bracket;

wherein the end, away from the equal-width cam mechanism, of the ball screw is provided with a spring latch assembly used for being connected with a building structure or a bridge structure,

wherein said spring latch assembly comprises a spring latch and a latch shell,

wherein said latch shell is movably sleeved outside the spring latch, and bolt holes which are matched with the spring latch is mounted in the two sides of said latch shell.

2. The cushioning mechanism according to claim 1, wherein said limiting bracket comprises an upper limiting baffle and two side limiting baffles and said upper limiting baffle is fixedly connected between two said side limiting baffles and covers the top of them.

3. The cushioning mechanism according to claim 1, wherein a sliding chute is set up in the middle of said upper limiting baffle; the top of said quadrilateral frame is slidingly connected into said sliding chute.

4. The cushioning mechanism according to claim 1, wherein the two sides of said quadrilateral frame are respectively provided with a first connecting buckle connected with said energy dissipaters.

5. The cushioning mechanism according to claim 1, wherein said cam is clamped between the two nuts and opposite to the reverse side of said cam 23, two said nuts 11 are respectively mounted with a thrust bearing 12 to support the ball screw 1.

6. The cushioning mechanism according to claim 1, wherein said base is provided with a plurality of mounting holes.

7. The cushioning mechanism according to claim 1, wherein second connecting buckles are arranged at the top of said energy dissipater fixing bases and said second connecting buckles and the first connecting buckles on the quadrilateral frame are arranged on the same horizontal height.

8. The cushioning mechanism according to claim 1, wherein said side limiting baffles are provided with one or more fixing stiffening ribs for supporting said side limiting baffles.