CN110485787B - Speed type friction damper - Google Patents
Speed type friction damper Download PDFInfo
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- CN110485787B CN110485787B CN201910730780.8A CN201910730780A CN110485787B CN 110485787 B CN110485787 B CN 110485787B CN 201910730780 A CN201910730780 A CN 201910730780A CN 110485787 B CN110485787 B CN 110485787B
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- damper
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- 238000007789 sealing Methods 0.000 claims abstract description 19
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000013016 damping Methods 0.000 abstract description 9
- 230000007246 mechanism Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 241000209499 Lemna Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Environmental & Geological Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention relates to a speed type friction damper, and belongs to the technical field of vibration control. The device comprises a left end plate, a right end plate, a first friction plate, a second friction plate, a sealing plate, an amplifying lever and a side plate, wherein the left end plate and the right end plate are grid-shaped, and a plurality of groups of first friction plates and a plurality of groups of second friction plates are oppositely parallel and staggered and overlapped. The cover plate is provided with an amplifying lever, and the amplifying lever is connected with the left end plate through various dampers. A plurality of parallel sliding grooves are respectively arranged on the second friction plate along the length direction, a plurality of groups of parallel first friction plate bolt holes are respectively arranged on the first friction plate along the length direction, the first friction plate bolt holes are correspondingly arranged with the sliding grooves, and the bolts can slide left and right in the sliding grooves. The invention amplifies the damping force of the small tonnage viscous damper through the friction positive pressure amplifying mechanism, so that the friction damper has the viscous damping characteristic. Meanwhile, the positive pressure of the friction surface of the friction damper is reduced on the premise of not losing the output of the damper.
Description
Technical Field
The invention relates to a friction damper, in particular to a speed type friction damper with an amplifying device and a pressure varying device, which can be used for energy dissipation and shock absorption control of a building structure and belongs to the technical field of vibration control.
Background
When the traditional friction damper does not reach the starting condition, the function exerted by the traditional friction damper can be regarded as a rigid rod; when the starting condition is reached, the friction damper utilizes damping, friction and plastic deformation of the friction damper to dissipate the seismic energy. At present, two problems exist in the research of the friction damper, one is that the earthquake action has uncertainty, so that the control difficulty of the sliding force of the friction damper is high, and the energy consumption cannot be considered in different earthquake inputs. Another problem is: the uncertainty of the friction performance of the friction plate when the friction plate works under long-term and high-stress conditions can influence the surface friction performance, and the friction plate can be damaged when seriously damaged, so that the friction plate fails.
In order to make the friction damper function under different earthquake inputs, wu, lemna et al in 1999 proposed a quasi-viscous friction damper, which is characterized in that the friction damper is formed by changing two faces of a cross core plate into convex faces on the basis of a Pall friction damper formed by a four-bar linkage mechanism, so that the damper has the energy consumption characteristic of the viscous damper. In 2004 Wu et al, an improvement was made on the basis of a T-shaped core plate friction damper, changing the friction plane at the top end of the abdomen of the T-shaped core plate into a wedge shape, and when the damper is deformed, it is made to have the same energy consumption characteristics of a viscous damper. Japanese scholars, tashida et al, directly connect the viscous damper in series with the conventional friction damper. Under the condition of small earthquake input, the viscous damper plays a role; in the case of large shock inputs, both dampers work simultaneously. But these several dampers do not get rid of the problem of applying pre-compression to the friction surface. Literature indicates that: for the steel-steel friction surface, in order to ensure stable hysteresis performance of the damper, the normal stress of the contact surface during the operation of the damper should be reduced. But decreasing the interface positive pressure means that the damper force is reduced. The friction surface of the friction damper is worn in the use process. During running-in, the morphology of the friction pair contact surface is gradually changed by wear and plastic deformation of the contact peaks. The result of this phenomenon is a reduction in friction surface stress, a reduction in coefficient of friction, and ultimately a reduction in damper force.
Disclosure of Invention
In order to solve the defects in the prior art, and reduce the damage of positive pressure to the friction surface of the friction damper and enable the friction damper to adapt to wider earthquake working conditions, the invention provides a speed type friction damper which is provided with an amplifying and pressure-changing device, and the damping force of a small-tonnage viscous damper is amplified through an amplifying friction positive pressure mechanism, so that the friction damper has the viscous damping characteristic. Meanwhile, the positive pressure of the friction surface of the friction damper is reduced on the premise of not losing the output of the damper.
In order to solve the technical problems, the invention adopts the following technical scheme:
A speed type friction damper comprises a left baffle, a right baffle, a first friction plate, a second friction plate, a top plate, an amplifying lever and a side plate, wherein the left baffle and the right baffle are grid-shaped; the left baffle comprises a first vertical plate, a first fixed clamping plate and a first connecting plate, wherein a plurality of groups of first fixed clamping plates which are arranged in parallel are arranged on the right side of the first vertical plate, and the first connecting plate is vertically arranged on the upper and lower positions on the right side of the first vertical plate and is symmetrical in position; a plurality of groups of first friction plates which are arranged in parallel are fixedly connected to the upper side and the lower side of the plurality of groups of first fixed clamping plates in parallel; a plurality of groups of parallel first friction plate bolt holes are respectively arranged on the first friction plate along the length direction; the outer surfaces of the first friction plates positioned at the upper end and the lower end of the outer side are also provided with top plates; the top plate comprises a sealing plate and a supporting plate; the arrangement of the sealing plate bolt holes on the sealing plate is correspondingly consistent with the arrangement of the side plate bolt holes on the side plate; the sealing plate is also provided with a group of supporting plates, three pairs of amplifying levers are clamped in the supporting plates through bolts, and damper connecting holes are formed in the outer ends of the amplifying levers; a hole groove is correspondingly formed in the sealing plate at the lower end of the amplifying lever, and the inner bottom end of the amplifying lever is directly pressed on the first friction plate at the outer side; the right baffle comprises a second vertical plate and a second fixed clamping plate, a plurality of groups of second fixed clamping plates which are arranged in parallel are arranged on the left side of the second vertical plate, and a plurality of groups of second friction plates which are arranged in parallel are clamped and fixed among the plurality of groups of second fixed clamping plates in parallel; a plurality of parallel sliding grooves are respectively arranged on the second friction plate along the length direction; the plurality of groups of first friction plates and the plurality of groups of second friction plates are arranged in a staggered and overlapped mode relative to each other; the sliding grooves correspond to a plurality of groups of first friction plate bolt holes on the first friction plates, and the plurality of groups of first friction plates and the plurality of groups of second friction plates are connected together through vertically arranged bolts; the upper part and the lower part of the first vertical plate are respectively provided with three first connecting plates, and the first connecting plates are connected with damper connecting holes arranged at the outer end of the amplifying lever through viscous dampers.
Further, the vertical length of the first riser is greater than the vertical length of the second riser.
Further, the first vertical plate is a vertical plate with a cross-shaped section, and a connecting hole connected with the viscous damper is formed in the first connecting plate.
Further, the number of the sliding grooves on the second friction plate is two, and the sliding grooves are respectively arranged on two sides of the second friction plate along the length direction.
Further, 2 groups of parallel first friction plate bolt holes are respectively arranged on the first friction plate along the length direction and are respectively positioned on two sides of the first friction plate, and a plurality of first friction plate bolt holes are arranged in each group of first friction plate bolt holes.
Further, the first friction plates are 17 groups, and the second friction plates are 16 groups.
Further, the right end part of the second friction plate is fixedly connected with the right ends of the second fixed clamping plate and the sealing plate through penetrating pins.
Further, the first vertical plate is fixedly connected with the left end of the first friction plate and the first fixed clamping plate through pins.
Further, the plurality of groups of first friction plates and the plurality of groups of second friction plates are connected together through vertically arranged bolts, and two ends of each bolt are fixed through nuts.
Further, the three first connecting plates and the three viscous dampers arranged at the upper end and the lower end are arranged in a delta shape.
Further, the pressure varying device is not limited to the amplifying device and the pressure varying device composed of the amplifying lever, the supporting plate and the viscous damper.
When one end of the damper is stretched, the first connecting plate drives the viscous damper to stretch, and the viscous damper drives the amplifying lever to rotate, so that the first friction plate on the outer side is pressed, the first friction plate and the second friction plate are pressed tightly, positive pressure between the friction plates is improved, the larger the stretching distance is, the larger the positive pressure and the resulting friction damping are, so that variable pressure is provided for the damper, and the friction damper has hysteresis characteristics of the viscous damper.
Compared with the prior art, the invention has the following technical effects:
The damper can realize that no pre-applied positive pressure exists on the friction surface when the damper is not in operation. The amplification mechanism amplifies the positive pressure transferred to the friction plate by the small-tonnage viscous damper, and the hysteresis curve of the positive pressure has the energy consumption characteristic of the viscous damper. Meanwhile, the problem that a common friction damper cannot participate in energy consumption under any earthquake input is solved, and the friction performance of the friction damper is adversely affected under the action of long-term high pre-compression stress of the friction plate.
Drawings
FIG. 1 is an overall schematic of a speed type friction damper of the present invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a detailed view of a first friction plate of the present invention;
FIG. 4 is a detail of a second friction plate of the present invention;
FIG. 5 is a detailed view of the top plate of the present invention;
FIG. 6 is a detail of a side panel of the present invention;
FIG. 7 is a hysteresis curve obtained from a damper test of the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to FIGS. 1-7.
Example 1
As shown in fig. 1 to 6, the speed type friction damper of the present invention comprises a left baffle plate 8, a right baffle plate 7, a first friction plate 5, a second friction plate 6, a top plate 2, an amplifying lever 4 and a side plate 3, wherein the left baffle plate 8 and the right baffle plate 7 are all in a grid shape. The left baffle 8 comprises a first vertical plate 81, a first fixing clamping plate 82 and a first connecting plate 83, wherein the first fixing clamping plates 82 of the multiple groups of parallel arrangement are arranged on the right side of the first vertical plate 81, and the first connecting plate 83 is vertically arranged on the right side of the first vertical plate 81 in a vertical position and is symmetrical in position. A plurality of groups of first friction plates 5 which are arranged in parallel are fixed on the upper side and the lower side of the plurality of groups of first fixed clamping plates 82 in parallel. The first friction plates 5 are provided with a plurality of groups of parallel first friction plate bolt holes 9 along the length direction. The outer surfaces of the first friction plates 5 positioned at the upper and lower ends of the outer side are also provided with top plates 2. The top plate 2 includes a sealing plate 21 and a support plate 22. The arrangement of the sealing plate bolt holes 11 on the sealing plate 21 is corresponding to the arrangement of the side plate bolt holes 12 on the side plate 3. The sealing plate 21 is also provided with a group of support plates 22, three pairs of amplifying levers 4 are clamped in the support plates 22 through bolts, and damper connecting holes are formed in the outer ends of the amplifying levers 4. The sealing plate 21 at the lower end of the amplifying lever 4 is correspondingly provided with a hole groove, and the inner bottom end of the amplifying lever 4 is directly pressed on the first friction plate 5 at the outer side. The right baffle 7 comprises a second vertical plate 71 and a second fixed clamping plate 72, a plurality of groups of second fixed clamping plates 72 which are arranged in parallel are arranged on the left side of the second vertical plate 71, and a plurality of groups of second friction plates 6 which are arranged in parallel are clamped and fixed between the plurality of groups of second fixed clamping plates 72 in parallel. The second friction plate 6 is provided with a plurality of parallel sliding grooves 10 along the longitudinal direction. The plurality of groups of first friction plates 5 and the plurality of groups of second friction plates 6 are arranged in a staggered and overlapped mode relative to each other. The sliding grooves 10 correspond to the plurality of groups of first friction plate bolt holes 9 on the first friction plate 5, and connect the plurality of groups of first friction plates 5 and the plurality of groups of second friction plates 6 together through vertically arranged bolts. The upper and lower parts of the first vertical plate 81 are respectively provided with three first connecting plates 83, and the first connecting plates 83 are connected with damper connecting holes arranged at the outer end of the amplifying lever 4 through viscous dampers 1.
Further, a certain displacement distance is reserved between the first friction plate 5 and the first riser 81 on the left side and between the second friction plate 6 and the second riser 71 on the right side. Is convenient for a certain amount of left and right movement. The vertical length of the first riser 81 is greater than the vertical length of the second riser 71. The first riser 81 is a cross-section riser, and the first connection plate 83 is provided with a connection hole to be connected with the viscous damper 1. As shown in fig. 4, the second friction plate 6 has two sliding grooves 10 provided on both sides of the second friction plate 6 in the longitudinal direction. As shown in fig. 3, the first friction plate 5 is provided with 2 groups of parallel first friction plate bolt holes 9 along the length direction, and the two groups of parallel first friction plate bolt holes are respectively positioned at two sides of the first friction plate 5, and each group of first friction plate bolt holes is internally provided with a plurality of first friction plate bolt holes 9. As shown in fig. 1-2, in the present embodiment, the first friction plates 5 are 17 groups, and the second friction plates 6 are 16 groups. The right end of the second friction plate 6 is fixedly connected with the second fixed clamping plate 72 and the right end of the sealing plate 21 through penetrating pins. The first vertical plate 81 is fixedly connected with the left end of the first friction plate 5 and the first fixed clamping plate 82 through pins. At the same time, the plurality of groups of first friction plates 5 and the plurality of groups of second friction plates 6 are connected together by vertically arranged bolts, and the two ends of the bolts are fixed by nuts. In addition, as shown in fig. 5, three first connection plates 83 provided at the upper and lower ends and three viscous dampers 1 are arranged in a delta-shaped arrangement.
The friction damper of the embodiment can provide a hysteresis curve with viscous damping property and can achieve the purpose of exchanging smaller positive pressure for larger damping force. Fig. 7 shows hysteresis curves obtained by the test of the working condition 4, the working condition 5 and the working condition 6 in the embodiment. This example is capable of providing 33.18kN damping force at a displacement of 18 mm. When the output of the viscous damper increases, the number of the pressure changing devices increases or the amplification factor provided by the amplifying device increases, the output of the damper increases.
The foregoing embodiments are merely illustrative of the technical solutions of the present application and are not intended to limit the present application, and variations of the technical solutions of the present application according to common knowledge in the art are within the scope of the present application, and in any case, the foregoing embodiments are merely illustrative, and the scope of the present application is defined by the scope of the appended claims.
Claims (8)
1. A speed type friction damper, characterized in that: the device comprises a left baffle (8), a right baffle (7), a first friction plate (5), a second friction plate (6), a top plate (2), an amplifying lever (4) and a side plate (3), wherein the left baffle (8) and the right baffle (7) are grid-shaped; the left baffle (8) comprises a first vertical plate (81), a first fixed clamping plate (82) and a first connecting plate (83), wherein a plurality of groups of first fixed clamping plates (82) which are arranged in parallel are arranged on the right side of the first vertical plate (81), and the first connecting plate (83) is vertically arranged on the right side of the first vertical plate (81) in an up-down position and is symmetrical in position; a plurality of groups of first friction plates (5) which are arranged in parallel are fixedly connected on the upper side and the lower side of the plurality of groups of first fixed clamping plates (82) in parallel; a plurality of groups of parallel first friction plate bolt holes (9) are respectively arranged on the first friction plate (5) along the length direction; the outer surfaces of the first friction plates (5) positioned at the upper end and the lower end of the outer side are also provided with top plates (2); the top plate (2) comprises a sealing plate (21) and a supporting plate (22); the arrangement of the sealing plate bolt holes (11) on the sealing plate (21) is correspondingly consistent with the arrangement of the side plate bolt holes (12) on the side plate (3); a group of support plates (22) are further arranged on the sealing plate (21), three pairs of amplifying levers (4) are clamped in the support plates (22) through bolts, and damper connecting holes are formed in the outer ends of the amplifying levers (4); a hole groove is correspondingly formed in the position of a sealing plate (21) at the lower end of the amplifying lever (4), and the inner bottom end of the amplifying lever (4) is directly pressed on the first friction plate (5) at the outer side; the right baffle (7) comprises a second vertical plate (71) and a second fixed clamping plate (72), a plurality of groups of second fixed clamping plates (72) which are arranged in parallel are arranged on the left side of the second vertical plate (71), and a plurality of groups of second friction plates (6) which are arranged in parallel are clamped and fixed among the plurality of groups of second fixed clamping plates (72); a plurality of parallel sliding grooves (10) are respectively arranged on the second friction plate (6) along the length direction; the plurality of groups of first friction plates (5) and the plurality of groups of second friction plates (6) are oppositely arranged in parallel and staggered and overlapped mode; the sliding grooves (10) correspond to a plurality of groups of first friction plate bolt holes (9) on the first friction plates (5), and a plurality of groups of first friction plates (5) and a plurality of groups of second friction plates (6) are connected together through vertically arranged bolts; the upper part and the lower part of the first vertical plate (81) are respectively provided with three first connecting plates (83), and the first connecting plates (83) are connected with damper connecting holes arranged at the outer end of the amplifying lever (4) through viscous dampers (1);
The vertical length of the first vertical plate (81) is larger than that of the second vertical plate (71); the first vertical plate (81) is a vertical plate with a cross-shaped section, and the first connecting plate (83) is provided with a connecting hole connected with the viscous damper (1).
2.A speed type friction damper according to claim 1, wherein: the two sliding grooves (10) on the second friction plate (6) are respectively arranged at two sides of the second friction plate (6) along the length direction.
3. A speed type friction damper according to claim 2, wherein: and 2 groups of parallel first friction plate bolt holes (9) are respectively arranged on the first friction plate (5) along the length direction and are respectively positioned at two sides of the first friction plate (5), and a plurality of first friction plate bolt holes (9) are arranged in each group of first friction plate bolt holes.
4. A speed friction damper according to claim 3, characterized in that: the first friction plates (5) are 17 groups, and the second friction plates (6) are 16 groups.
5. A speed type friction damper according to claim 1, wherein: the right end part of the second friction plate (6) is fixedly connected with the right ends of the second fixed clamping plate (72) and the sealing plate (21) through penetrating pins.
6. A speed type friction damper according to claim 1, wherein: the first vertical plate (81) is fixedly connected with the left end of the first friction plate (5) and the first fixed clamping plate (82) through pins.
7. A speed type friction damper according to claim 1, wherein: and the two ends of the vertically arranged bolts are fixed through nuts, and the plurality of groups of first friction plates (5) and the plurality of groups of second friction plates (6) are connected together.
8. A speed type friction damper according to claim 1, wherein: the three first connecting plates (83) and the three viscous dampers (1) arranged at the upper end and the lower end are arranged in a delta-shaped manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910730780.8A CN110485787B (en) | 2019-08-08 | 2019-08-08 | Speed type friction damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910730780.8A CN110485787B (en) | 2019-08-08 | 2019-08-08 | Speed type friction damper |
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| Publication Number | Publication Date |
|---|---|
| CN110485787A CN110485787A (en) | 2019-11-22 |
| CN110485787B true CN110485787B (en) | 2024-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910730780.8A Active CN110485787B (en) | 2019-08-08 | 2019-08-08 | Speed type friction damper |
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| GB1416516A (en) * | 1971-11-12 | 1975-12-03 | Gloucester Railway Carriage | Damping means |
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| CN210508604U (en) * | 2019-08-08 | 2020-05-12 | 北京工业大学 | Velocity type friction damper |
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2019
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| CN110485787A (en) | 2019-11-22 |
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