CN106639458A - Three-dimensional vibration-isolation supporting seat - Google Patents

Three-dimensional vibration-isolation supporting seat Download PDF

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Publication number
CN106639458A
CN106639458A CN201610924515.XA CN201610924515A CN106639458A CN 106639458 A CN106639458 A CN 106639458A CN 201610924515 A CN201610924515 A CN 201610924515A CN 106639458 A CN106639458 A CN 106639458A
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CN
China
Prior art keywords
steel wire
plate
wire rope
spring
hole
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610924515.XA
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Chinese (zh)
Inventor
谢韩涛
刘汶津
韩磊
张少华
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Nanjing Dade Damping Technology Co Ltd
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Nanjing Dade Damping Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Nanjing Dade Damping Technology Co Ltd filed Critical Nanjing Dade Damping Technology Co Ltd
Priority to CN201610924515.XA priority Critical patent/CN106639458A/en
Publication of CN106639458A publication Critical patent/CN106639458A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04HBUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00Buildings, or groups of buildings, or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake, extreme climate
    • E04H9/02Buildings, or groups of buildings, or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake, extreme climate withstanding earthquake or sinking of ground
    • E04H9/021Bearing, supporting or connecting constructions specially adapted for such buildings

Abstract

The invention relates to a three-dimensional vibration-isolation supporting seat. The supporting seat comprises an upper connecting plate, a lower connecting plate and four backpressure type spring dampers, wherein the upper connecting plate and the lower connecting plate are mutually parallel, and the backpressure type spring dampers are installed between the upper connecting plate and the lower connecting plate; connecting rods at the two ends of each backpressure type spring damper are connected with the upper connecting plate and the lower connecting plate through universal ball heads correspondingly, and a quadrangular frustum pyramid structure with two opposite side faces is formed. Through the three-dimensional vibration-isolation supporting seat, three-dimensional vibration isolation is achieved in a real sense, and the anti-overturning effect is further achieved.

Description

A kind of three-dimensional shock isolation support
Technical field
The present invention relates to a kind of building vibration proof (or vibrations) device, and in particular to three-dimensional isolation device.
Background technology
Three-dimensional isolation device is a kind of shockproof isolating device being located between building and basis, can effectively be inhaled from various dimensions Receipts, the energy of dissipation outside input, so as to reach the purpose of protection building safety.Three-dimensional isolation device is generally by vertical earthquake isolating Bearing and horizontal seismic isolation bearing are combined, and both absorb respectively both vertically and horizontally seismic wave.
It is well known that the development of three-dimensional isolation device depends on the technological progress of damper.At present, practical application is really entered The damper of main flow mainly have three major types, i.e. laminated rubber damper, metal spring damper (mainly disk spring and spiral shell Rotation spring) and viscoelastic damper (larger static load can not be undertaken).Therefore, on the existing three-dimensional shock isolation support overwhelming majority is all The combination of damper is stated, and is essentially all that laminated rubber damper is connected up and down with metal spring damper.In order to overcome Laminated rubber resistance to tension is weak, disk spring can not draw and helical spring initial stiffness is low and stretches different from compression property Shortcoming, has some three-dimensional shock isolation supports to be additionally arranged tensile structure (such as setting up steel wire rope in surrounding) in laminated rubber damper, Also there are some three-dimensional shock isolation supports by metal spring damper and viscoelastic damper (or other Stretch materials, such as rhombus steel Plate etc.) it is compound, static load and compression shock absorption are undertaken using metal spring damper, using viscoelastic damper stretching, compression power consumption. But, the compound damper of various flexible members, not only complex structure, and need to consider horizontally and vertically to associate journey when designing Degree, calculates sufficiently complex.
A kind of three-dimemsional vibration insulationg system disclosed in the patent application of Publication No. CN1560395A, the system is common Tandem compound disk spring and the viscoelastic damping being located in disk spring axis of guide centre bore on lead for retractable pencil laminated rubber vibrating isolating device What device was realized.But, because viscoelastic material is larger with the damping characteristic difference of disk spring, and both correlation degree has Much, these all will be determined by testing;Especially, when the three-dimemsional vibration insulationg system is by tension transition is pressed to, Although disk spring does not work, the energy stored by disk spring can be added on viscoelastic damper, make viscoplasticity Damper obtains larger initial acceleration, and viscoelastic damper is then a kind of velocity sensitization type damper, it is clear that dish-shaped bullet Impact of the energy stored by spring to viscoelastic damper can not be ignored, and how the impact will calculate, then be a difficulty Thing.For another example a kind of three-dimensional isolation device disclosed in the patent application of Publication No. CN101761147A, the device is pressed to During tension transition, wherein the energy of six disk spring storages also can be delivered on rhombic steel plate damper, equally by screw rod There is also the problem of design dyscalculia.Additionally, the slide block, rail plate and height in the scheme of CN101761147A patent applications Horizontal limiting and stretch-proof organization that rope is constituted are haled, design dyscalculia is not only made, and also add whole shock isolation system Complexity.
The content of the invention
The technical problem to be solved is to provide a kind of three-dimensional shock isolation support, and the three-dimensional shock isolation support is only with one Damper is planted, is not only simple in structure, and can antidumping.
The present invention solves the technical scheme of above-mentioned technical problem:
A kind of three-dimensional shock isolation support, the bearing includes the upper junction plate being parallel to each other, lower connecting plate and is located at upper junction plate Four back pressure type spring-dampers, connecting rod and the upper company at each back pressure type spring-damper two are provided between lower connecting plate Linked together by universal ball end respectively between fishplate bar and lower connecting plate, form the truncated rectangular pyramids that a two opposite side surfaces are respectively symmetrically Structure;
Described back pressure type spring-damper includes a fairlead, and of the fairlead is provided with the first end cap, other end It is provided with the second end cap;The compression spring with centre bore is coaxially provided with described fairlead, a drive member acts on compression On spring, the drive member includes dynamic pressure plate and connecting rod, and wherein dynamic pressure plate is located at the head of compression spring, and connecting rod is located at Axis on dynamic pressure plate and along fairlead extends fairlead, and end is provided with bulb;The outer surface of the second described end cap is provided with Another connecting rod, the connecting rod is coaxial with the connecting rod in the drive member, and end is provided with another bulb;
Backpressure device is additionally provided with described fairlead, the backpressure device includes at least three precompressed steel wire ropes and precompressed The equal steel wire rope break-in element of steel wire rope quantity and one piece of floating platen, wherein,
Described floating platen is located between the second end cap and compression spring;
Described steel wire rope break-in element is fixed in described drive member around the axisymmetrical of described fairlead;
Described precompressed steel wire rope is distributed in the centre bore of compression spring with broken line state, and each precompressed steel wire rope An axisymmetrical around described fairlead be fixed on floating platen, other end passed around a relative steel wire rope change Turn back to after element, then by the fixing point from the precompressed steel wire rope on floating back-pressure steel plate through floating platen by cable wire from Break adrift tool is fixed on second end cap;
It is respectively equipped with through the precompressed steel wire rope in the position through the precompressed steel wire rope on described floating platen Through hole, the aperture of the through hole is more than the diameter of worn precompressed steel wire rope;
The precompressed steel wire rope is tensioned, the distance between the floating platen and described dynamic pressure plate is equal to compression spring It is compressed to the length of default rigidity.
In such scheme, described compression spring is disk spring group, spiral compression spring or complex spring, wherein, institute Axially overlapping is constituted by one group of disk spring to state disk spring group, and the complex spring is rubber-metal spiral complex spring.
In such scheme, described steel wire rope break-in element for common fixed pulley or similar break-in function suspension ring shape Component, such as lifting bolt, U-shaped component, wherein the easiest with lifting bolt.
In such scheme, described cable wire self-locking anchorage is made up of installing hole, jaw and check bolt, wherein,
Described installing hole is located on second end cap and is made up of one section of taper hole and one section of screwed hole, wherein, it is described Taper hole is located near the side of floating platen, and tip points to floating platen, and the screwed hole is located remotely from the one of floating platen Side;
Described jaw is to match cone with the taper hole, and is made up of 3-5 lobes, and it is provided with clamping along axis in vivo The clamping hole of precompressed steel wire rope;
Described check bolt matches with the screwed hole, and is provided with diameter greater than the pre- steel wire along axis in vivo The circular hole of rope diameter;
Described jaw is arranged in the taper hole, and check bolt is arranged in the screwed hole.
From above-mentioned cable wire self-locking anchorage, by one of the precompressed steel wire rope described floating platen is separately fixed at On, other end, so can be the rope for exposing respectively by passing in the clamping hole and circular hole of described cable wire self-locking tensioning anchorage Head system is connected on traction stretching machine, and tension force is monitored using tension detecting instrument while tensioning is drawn.When the precompressed steel wire rope When being tensioned to default rigidity, turn check bolt and promote the jaw to clamp precompressed steel wire rope and locked, even if vibrated In journey precompressed steel wire rope be tensioned repeatedly, it is loose in the case of also will not loosen.
In such scheme, the angle between described back pressure type spring-damper and lower connecting plate can be according to whole bearing institute The dead load and default earthquake intensity for undertaking is selected.
Damping device of the present invention has the advantages that:
(1) axial force for being born due to each back pressure type spring-damper is either positive or reversely, compresses bullet Spring can produce elastic compression and deform and damping, therefore three-dimensional shock isolation support of the present invention can isolate the level side of seismic wave To component, vertical component and torsional component, and then realize three-dimensional isolation truly.
(2) whole bearing is mainly made up of the same back pressure type spring-damper of two pieces of connecting plates and four, not only structure It is simple and direct, and the transfer route of power is clear, clear and definite, greatly reduces design difficulty in computation.
(3) changing the length of precompressed steel wire rope can change the initial stiffness of each back pressure type spring-damper, therefore can The initial stiffness of each damper is calculated according to each bearing static load to be undertaken, and then ensures to be built after support is withdrawn The vertical displacement of thing is little, does not even produce vertical displacement.It can be seen that three-dimensional shock isolation support of the present invention had both been adapted to newly-built building Thing shock insulation is built, the shock-insulating reconstruction of existing building also is adapted for.
(4) three-dimensional isolation truly, but also the effect with antidumping are not only capable of achieving.
Description of the drawings
Fig. 1~4 are the structural representation of a specific embodiment (adopting Approximate) of bearing of the present invention, its In, Fig. 1 is front view, and Fig. 2 is left view, and Fig. 3 top views, Fig. 4 is the enlarged drawing of local I in Fig. 1.
Fig. 5~10 are the structural representation of a concrete scheme of back pressure type spring-damper in the illustrated embodiment of Fig. 1~4 Figure, wherein, Fig. 5 is front view (section view), and Fig. 6 is A-A sectional views (precompressed steel wire rope is omitted in figure) of Fig. 5, and Fig. 7 is Fig. 5's B-B sectional views (omit precompressed steel wire rope) in figure, Fig. 8 is the enlarged drawing of local II in Fig. 5, and Fig. 9 is C-C sectional views of Fig. 8, Figure 10 is the enlarged drawing of local III in Fig. 5.
Figure 11 is the structural representation of second concrete scheme of back pressure type spring-damper of the present invention.
Figure 12 is the structural representation of the 3rd concrete scheme of back pressure type spring-damper of the present invention.
Specific embodiment
Example 1
Referring to Fig. 1~4, the three-dimensional shock isolation support in this example includes the upper junction plate 1 being parallel to each other, lower connecting plate 2 and sets Four back pressure type spring-dampers 3 are provided between upper junction plate 1 and lower connecting plate 2;Each two of back pressure type spring-damper 3 Connecting rod 3-1 and upper junction plate 1 and lower connecting plate 2 between linked together by universal ball end respectively, formed one or so two Side is symmetrical, the truncated rectangular pyramids structure that former and later two sides are symmetrical.Back pressure type spring-damper 3 and lower connecting plate described in this example Angle between 2 is 70 °.
It is universal between connecting rod 3-1 and upper junction plate 1 and lower connecting plate 2 at above-mentioned two of back pressure type spring-damper 3 Bulb attachment structure is identical, is retouched by taking the universal ball head connecting structure between connecting rod 3-1 and lower connecting plate 2 as an example below State.Referring to Fig. 1 and Fig. 4, the universal ball end between connecting rod 3-1 and lower connecting plate 2 of the above-mentioned following of back pressure type spring-damper 3 Attachment structure includes the ball-and-socket on lower connecting plate 2, the bulb 3-2 of the following of back pressure type spring-damper 3 and cover plate 4, wherein, it is described The middle part of cover plate 4 be provided with the sphere hole matched with bulb 3-2, the bulb 3-2 of the following of back pressure type spring-damper 3 is by the ball Face is buckled in the ball-and-socket on connecting plate 2, is covered 4 and is fixed on lower connecting plate 2 by four bolts 5.Described sphere hole it is interior Wall is provided with cannelure, and sealing ring 6 is provided with groove, to avoid the lubricant in the universal ball head connecting structure from spilling.
Referring to Fig. 5~10, the back pressure type spring-damper 3 in above-mentioned three-dimensional shock isolation support includes a fairlead 3-3, and this is led Top to set 3-3 is provided with the first end cap 3-4, and following is provided with the second end cap 3-5;Pressure is coaxially provided with described fairlead 3-3 Contracting spring 3-6, compression spring 3-6 is that the disk spring group for constituting axially is overlapped by one group of disk spring;One drive member is made In compression spring 3-6, the drive member includes dynamic pressure plate 3-7 and connecting rod 3-1, and wherein dynamic pressure plate 3-7 is located at compression bullet The head of spring 3-6, connecting rod 3-1 is located on dynamic pressure plate 3-7 and the axis along fairlead 3-3 extends fairlead 3-3, and end sets There is bulb 3-2;The outer surface of the second described end cap 3-5 is provided with another connecting rod 3-1, the company in the connecting rod and drive member Extension bar 3-1 is coaxial, and end is provided with another bulb 3-2.For the ease of assembling, adopt between described bulb 3-2 and connecting rod 3-1 Linked together with being screwed.
Referring to Fig. 5~10, backpressure device is additionally provided with described fairlead 3-3, the backpressure device includes the precompressed of four Steel wire rope 3-8, four are only used as steel wire rope break-in element lifting bolt 3-12 and one piece of floating platen 3-9, wherein,
Described floating platen 3-9 is located between the second end cap 3-5 and compression spring 3-6;
Described four are only used as the axisymmetricals of the lifting bolt 3-12 around described fairlead 3-3 of steel wire rope break-in element On fixed dynamic pressure plate 3-7;
Axisymmetrical on described floating platen 3-9 around fairlead 3-3 is provided with another four lifting bolt 3-12, the suspension ring A through hole 3-11 for passing through precompressed steel wire rope 3-8 is respectively equipped with by screw 3-12, the aperture of through hole 3-11 is more than what is worn The diameter of precompressed steel wire rope 3-8;Described precompressed steel wire rope 3-8 is symmetrically distributed in around the axis of fairlead 3-3 with broken line state In the centre bore of compression spring 3-6, and, one of each precompressed steel wire rope 3-8 be fixed on by lifting bolt 3-12 it is floating On dynamic pressure plate 3-9, other end passed around to be turned back after a lifting bolt 3-12 of relative as steel wire rope break-in element, then Set through hole 3-11 is anchored on the second end cap 3-5 by cable wire self-locking anchorage 10 through on floating platen 3-9.
Referring to Fig. 5 and Figure 10, described steel wire rope self-locking is tensioned anchorage 10 by the installing hole being located on the second end cap 3-5 10-1, jaw 10-2 and check bolt 10-3 are constituted;Described installing hole 10-1 is made up of one section of taper hole and a screwed hole, its In, the taper hole is located near the side of floating platen 3-9, and tip points to floating platen 3-9, and the screwed hole is located remotely from The side of floating platen 3-9;Described jaw 10-2 is to match cone with the taper hole, and is made up of 3 lobes, its internal edge Axis is provided with the clamping hole of clamping precompressed steel wire rope 3-8;Described check bolt 10-3 matches with the screwed hole, and in vivo The circular hole with diameter greater than the precompressed steel wire rope 3-8 diameters is provided with along axis;Described jaw 10-2 is arranged in the taper hole, Check bolt 10-3 is arranged in the screwed hole.During assembling, the other end of corresponding precompressed steel wire rope 3-8 is clamped in into jaw In the clamping hole of 10-2, end passes from the circular hole of check bolt 10-3.
Referring to Fig. 5 and Figure 10, make by the scheme of this example and assemble after the back pressure type spring-damper 3, what is exposed The fag end of precompressed steel wire rope 3-8 is respectively to be connected on traction stretching machine, is monitored using tension detecting instrument while tensioning is drawn Tension force.When the tension force needed for the precompressed steel wire rope 3-8 is tensioned to default rigidity, by turning check bolt 10-3 institute is promoted State jaw 10-2 to clamp precompressed steel wire rope 3-8 and locked.So tensioning precompressed steel wire rope 3-8, makes described two pieces float and presses The distance between plate 3-9 is equal to the length that compression spring 3-6 is compressed to default rigidity.
Referring to Fig. 5, when back pressure type spring-damper 3 is subject to the external load of axial direction, no matter external load be pressure or Pulling force, if its less than above-mentioned default rigidity, compression spring 3-6 will not continue to deformation.When external load is more than described During precompression, if external load is pressure, in the case where the dynamic pressure plate 3-7 is promoted, compression compression spring 3-6 produces elastic deformation; If external load is pulling force, precompressed steel wire rope 3-8 drawing floating platen 3-9 reverse compressions compression spring 3-6 produces elasticity Deformation.
Referring to Fig. 1 and Fig. 3, it is assumed that upper junction plate 1 is fixed on building, on the basis of lower connecting plate 2 is fixed on, that , if seismic wave produces a horizontal thrust from left to right, lower connecting plate 2 just moves right, four back pressure type spring dampings Device 3 is then rotated counterclockwise rotating around the bulb 3-2 on top, the quilt of two on the left of three-dimensional shock isolation support back pressure type spring-damper 3 Compression, two back pressure type spring-dampers 3 in left side are then stretched;If seismic wave produces a downward pulling force, four back-pressures Formula spring-damper 3 is stretched simultaneously;If seismic wave one rotating torque of generation (either clockwise or counterclockwise), four Back pressure type spring-damper 3 is also stretched simultaneously;In the same manner, if building toward side topple when, have two back pressure type springs Damper 3 is stretched, and another two back pressure type spring-dampers 3 are compressed.Other stress of three-dimensional shock isolation support of the present invention The operation principle public of state can voluntarily analyze.
As seen from the above analysis, three-dimensional shock isolation support of the present invention is not only capable of achieving three-dimensional isolation truly, But also the effect with antidumping.
Example 2
Referring to Figure 11, compression spring 3-6 in back pressure type spring-damper 3 is common metal spiral compression spring.
The other structures other than the above of three-dimensional shock isolation support described in this example and implementation are same as Example 1.
Example 3
Referring to Figure 12, compression spring 3-6 in back pressure type spring-damper 3 is common complex spring, the complex spring It is composited with metal coil spring by rubber.
The other structures other than the above of three-dimensional shock isolation support described in this example and implementation are same as Example 1.

Claims (3)

1. a kind of three-dimensional shock isolation support, the bearing include the upper junction plate being parallel to each other, lower connecting plate and be located at upper junction plate with Four back pressure type spring-dampers, connecting rod and the upper connection at each back pressure type spring-damper two are provided between lower connecting plate Linked together by universal ball end respectively between plate and lower connecting plate, form the truncated rectangular pyramids knot that a two opposite side surfaces are respectively symmetrically Structure;
Described back pressure type spring-damper includes a fairlead, and of the fairlead is provided with the first end cap, and other end is provided with Second end cap;The compression spring with centre bore is coaxially provided with described fairlead, a drive member acts on compression spring On, the drive member includes dynamic pressure plate and connecting rod, and wherein dynamic pressure plate is located at the head of compression spring, and connecting rod is located at dynamic pressure Axis on plate and along fairlead extends fairlead, and end is provided with bulb;The outer surface of the second described end cap is provided with another Connecting rod, the connecting rod is coaxial with the connecting rod in the drive member, and end is provided with another bulb;
Backpressure device is additionally provided with described fairlead, the backpressure device includes at least three precompressed steel wire ropes and pre- steel wire The equal steel wire rope break-in element of rope quantity and one piece of floating platen, wherein,
Described floating platen is located between the second end cap and compression spring;
Described steel wire rope break-in element is fixed in described drive member around the axisymmetrical of described fairlead;
Described precompressed steel wire rope is distributed in the centre bore of compression spring with broken line state, and the one of each precompressed steel wire rope Head is fixed on floating platen around the axisymmetrical of described fairlead, and other end passed around relative steel wire rope break-in unit Turn back after part, then pass through floating platen by cable wire from break adrift by the fixing point from the precompressed steel wire rope on floating back-pressure steel plate Tool is fixed on second end cap;
The through hole through the precompressed steel wire rope is respectively equipped with the position for passing through the precompressed steel wire rope on described floating platen, Diameter of the aperture of the through hole more than worn precompressed steel wire rope;
The precompressed steel wire rope is tensioned, the distance between the floating platen and described dynamic pressure plate is equal to and is compressed compression spring To the length of default rigidity.
2. a kind of three-dimensional shock isolation support according to claim 1, it is characterised in that described compression spring is disk spring Group, spiral compression spring or complex spring, wherein, by one group of disk spring, axially overlapping is constituted the disk spring group, described Complex spring is rubber-metal spiral complex spring.
3. a kind of three-dimensional shock isolation support according to claim 1 and 2, it is characterised in that described cable wire self-locking anchorage by Installing hole, jaw and check bolt are constituted, wherein,
Described installing hole is located on second end cap and is made up of one section of taper hole and one section of screwed hole, wherein, the taper hole Positioned at the side of close floating platen, and tip points to floating platen, and the screwed hole is located remotely from the side of floating platen;
Described jaw is to match cone with the taper hole, and is made up of 3-5 lobes, and it is provided with clamping precompressed along axis in vivo The clamping hole of steel wire rope;
Described check bolt matches with the screwed hole, and is provided with straight with diameter greater than the precompressed steel wire rope along axis in vivo The circular hole in footpath;
Described jaw is arranged in the taper hole, and check bolt is arranged in the screwed hole.
CN201610924515.XA 2016-10-24 2016-10-24 Three-dimensional vibration-isolation supporting seat Pending CN106639458A (en)

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Publication number Priority date Publication date Assignee Title
CN107119957A (en) * 2017-05-24 2017-09-01 东南大学 A kind of three-dimensional steel wire rope tuned mass damper device
CN108092224A (en) * 2017-12-22 2018-05-29 周五莲 A kind of high-voltage arrester mounting bracket
CN108335854A (en) * 2018-03-29 2018-07-27 安徽金环电气设备有限责任公司 Power transformer
CN108425433A (en) * 2018-02-05 2018-08-21 同济大学 A kind of adaptive stiffness characteristics mobile decoupling formula three-dimensional isolation/shake bearing

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CN201136517Y (en) * 2007-12-18 2008-10-22 中国北车集团四方车辆研究所 Bidirectional buffer for pulling-pressing conversion of elastic body
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US20100032876A1 (en) * 2008-08-07 2010-02-11 Drs Sensors & Targeting Systems, Inc. Vibration isolator system
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CN105370043A (en) * 2015-09-29 2016-03-02 中国建筑第二工程局有限公司 Stranded wire harness guiding device and stranded wire harness penetrating method

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CN105370043A (en) * 2015-09-29 2016-03-02 中国建筑第二工程局有限公司 Stranded wire harness guiding device and stranded wire harness penetrating method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107119957A (en) * 2017-05-24 2017-09-01 东南大学 A kind of three-dimensional steel wire rope tuned mass damper device
CN108092224A (en) * 2017-12-22 2018-05-29 周五莲 A kind of high-voltage arrester mounting bracket
CN108425433A (en) * 2018-02-05 2018-08-21 同济大学 A kind of adaptive stiffness characteristics mobile decoupling formula three-dimensional isolation/shake bearing
CN108335854A (en) * 2018-03-29 2018-07-27 安徽金环电气设备有限责任公司 Power transformer

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