CN106499078A - A kind of rubber air spring damper that can adjust early stage rigidity - Google Patents
A kind of rubber air spring damper that can adjust early stage rigidity Download PDFInfo
- Publication number
- CN106499078A CN106499078A CN201610901557.1A CN201610901557A CN106499078A CN 106499078 A CN106499078 A CN 106499078A CN 201610901557 A CN201610901557 A CN 201610901557A CN 106499078 A CN106499078 A CN 106499078A
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- air spring
- rubber air
- precompressed cable
- fairlead
- early stage
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- 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
-
- 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
- E04H9/027—Preventive constructional measures against earthquake damage in existing buildings
Abstract
The invention discloses a kind of rubber air spring damper that can adjust early stage rigidity, it is characterized in that, backpressure device is additionally provided with described fairlead, the backpressure device includes two groups of precompressed cable wires and two pieces of floating platens, wherein, two groups of described precompressed cable wires are symmetrically distributed in the annular space between rubber air spring and fairlead with linear state rotating around the axis of fairlead, and of one group of precompressed cable wire is separately fixed on the floating platen adjacent with the second end cap, other end is separately fixed in drive member through the floating platen adjacent with drive member, one of another group of precompressed cable wire is separately fixed on the floating platen adjacent with drive member, other end is separately fixed on the second end cap through the floating platen adjacent with the second end cap, in the middle part of each precompressed cable wire, string has wire tensioner；Two groups of precompressed cable wires of tensioning, make the rubber air spring be clamped between two pieces of floating platens all the time.
Description
Technical field
The present invention relates to damping device, more particularly to using the damper of rubber air spring.
Background technology
Rubber air spring is a kind of curved capsule that is fitted by rubber, netting twine and formed, and capsule two ends are with two pieces of dense steel plates
Envelope, forms a delivery air chamber, realizes elastic reaction using the compressibility of air；As rubber air spring has non-thread
Property characteristic, and the natural frequency of vibration is low, it is widely used in some dither occasions, such as automobile, high frequency as isolation component
Machinery and building structure etc..
People pursue a kind of " resisting " and " consumption " phase for the design of the anti-seismic structure especially anti-seismic structure of high-rise
In conjunction with synthesis anti-seismic performance, i.e., in the presence of weak wind shake and small earthquake, anti-seismic structure can be provided additionally for building main body
Additional stiffness resisting the effect of external load, the integrality of retainer body structure, it is to avoid internal injury occurs in main structure body；
Shake in high wind and then start yield deformation with anti-seismic structure in the presence of violent earthquake, by anti-seismic structure in damper damping make
It is used for the external energy that dissipates, main structure body is shaken in high wind and is unlikely to be seriously damaged in violent earthquake or even collapses.This just will
Ask be applied to anti-seismic structure can keep in the presence of outside weak load rigidity, do not deform；Effect in outside strong load
Under can then deform power consumption.But existing isolated component, either metal spring damper or rubber air spring, cannot
Perfectly meet above-mentioned antidetonation demand, any spring-damper can produce more or less elasticity in the presence of external load
Deformation.The performance of the therefore Antiseismic building structure pursued by above-mentioned people is it is difficult to perfect realize.
Authorization Notice No. discloses a kind of wind resistance damping for building for the utility application of 204081122 U of CN
Spring-damper, two elastomers (i.e. two helical springs) that the damper is directed in set are respectively and fixedly connected with center shaft
On middle limiter assembly, when damper is tension or in compression, one of elastomer tension, another elastomer are pressurized, so as to reality
Existing wind resistance damping.But, the utility model patent is clearly present following shortcomings：1st, two helical springs, whole damper are needed
Length longer, be not suitable in space mounting in small distance；2nd, it is difficult even not can guarantee that two springs in technique
Rigidity (including tensible rigidity and compression stiffness) is equal, and therefore wind direction difference damping effect is difference；3rd, damper cannot be changed
Early stage rigidity, reach default wind resistance rank, reduce the purpose of damping cost；4th, a helical spring is simultaneously in stretching and compression
Work under two states, the metal material of existing spring and production technology are difficult to meet and require, can only pass through to reduce helical spring
Regime of elastic deformation come realize stretching with compression two kinds of working conditions, this obviously can cause the wasting of resources.
Rubber air spring is typically only capable to bear compressive load, and resistance to tension is weak, can stretch power consumption to composition and can press
The damper of contracting power consumption, it is necessary to which wind resistance damping spring damper for building is the same as described above is divided by two rubber air springs
Double-deformation is not born；Therefore rubber air spring also has wind resistance damping spring damping for building as described above as earthquake isolating equipment
The same shortcoming of device.
The application for a patent for invention of Publication No. CN101457553A discloses one kind, and " spring stiffness adjustable tuning quality subtracts
Shake device ", the shock absorber is a kind of composite buffer, changes its characteristic frequency by changing the thickness of mass, viscous by changing
The flow of the working media of stagnant damper changes its damping ratio, changes its rigidity by the effective active length for changing spring, its
The means of the middle effective active length for changing spring have three kinds, and one is a section be located at spring using curing materials in solidification cylinder
Solidification, two fill in constraint block, and the two interference fit toward intracardiac in helical spring, make the one section of spring contacted with constraint block
Failure, three is to arrange helical raised on constraint block surface, and helical raised is stuck between spring wire, makes to block between spring wire
There is one section of spring failure of helical raised.As rubber air spring is the sealed gas chamber that main body is made up of rubber, above-mentioned three
The means for planting the effective active length for changing spring are simply not proposed to rubber air spring；In addition the resistance damper of this form
Not only effective active length of spring substantially shortens, and can only compress passive energy dissipation, it is impossible to stretch passive energy dissipation.
Content of the invention
The technical problem to be solved is to provide a kind of rubber air spring damping that can adjust early stage rigidity
Device, the damper can not only adjust early stage rigidity, and only with a rubber air spring, just both compressible power consumption subtracts
Shake, and stretchable passive energy dissipation.
The present invention solves the technical scheme of above-mentioned technical problem：
A kind of rubber air spring damper that can adjust early stage rigidity, the rubber air spring damper include being oriented to
Set, of the fairlead are provided with the first end cap, and other end is provided with the second end cap；Spring is coaxially provided with described fairlead,
By putting on the outside of the first end cap in described fairlead, the drive member includes dynamic pressure plate and drive rod to one drive member, its
Described in dynamic pressure plate be located at the head of the spring, the drive rod is located on dynamic pressure plate and extends along fairlead axis and lead
To set；Characterized in that,
Described spring is rubber air spring, the internal diameter of the external diameter of the rubber air spring less than fairlead, the two it
Between form an annular space；
Backpressure device is additionally provided with described fairlead, it is pre- that the backpressure device includes that quantity is at least two groups of three respectively
Compressed steel rope, two pieces of floating platens and quantity are the wire tensioner of two groups of precompressed cable wire sum, wherein,
One piece described of two pieces of floating platens are located between the dynamic pressure plate and rubber air spring, and another piece is located at second
Between end cap and rubber air spring；
Two groups of described precompressed cable wires are symmetrically distributed in the annular space rotating around the axis of fairlead with linear state
Interior, and of one group of precompressed cable wire is separately fixed on the floating platen adjacent with the second end cap, other end through and dynamic pressure
The adjacent floating platen of plate is separately fixed on dynamic pressure plate, one of another group of precompressed cable wire be separately fixed at adjacent with dynamic pressure plate
Floating platen on, other end is separately fixed on the second end cap through the floating platen adjacent with the second end cap；
Described wire tensioner is serially connected in the middle part of the precompressed cable wire；
On described floating platen, it is respectively equipped with the position through the precompressed cable wire and wears the logical of the precompressed cable wire
Hole, the aperture of the through hole are more than the diameter of worn precompressed cable wire；
Dynamic cooperation is respectively adopted between described fairlead and two pieces of floating platens；
Two groups of precompressed cable wires of tensioning, make the distance between two pieces of floating platens default equal to rubber air spring to be compressed to
The length of early stage rigidity.
In such scheme, described precompressed cable wire can be steel wire rope, or prestressing force steel hinge line.
The operation principle of above-mentioned rubber air spring damper is as follows：When dynamic loading is acted on relatively along the axis of fairlead
When, described drive member compresses downwards rubber air spring；When dynamic loading is acted on opposite to each other along the axis of fairlead, described
Two groups of precompressed cable wires pull two pieces of floating platens to move towards compressing rubber air spring.As can be seen here, axial dynamic loading no matter
Relative or act on rubber air spring damper opposite to each other, can compressing rubber air spring so as to there is elastic deformation and
Power consumption.
From above-mentioned operation principle, the hole of the through hole on the precompressed cable wire described in the course of work and the floating platen
Wall can not produce friction, otherwise interfere with moving up and down for floating platen, therefore on the floating platen set through hole straight
Footpath is more how many greatly than the diameter of the precompressed cable wire, not disturb and moving up and down for floating platen should be affected to be advisable.
The rubber air spring damper that early stage rigidity can be adjusted of the present invention, wherein described precompressed cable wire two
Head can adopt anchoring, similar lifting bolt system may also be employed and connects fixation.
For preventing described rubber air spring two from sliding on the floating platen, another improvement project of the present invention
It is：A locating ring is respectively equipped with the relative surface of two pieces of floating platens, and two difference of the rubber air spring is embedding
In described locating ring.
Damper of the present invention can be widely used for various one-dimensional shock insulation fields, e.g., plant equipment internal vibration every
From, Equipment Foundations shock insulation, the seismic hardening of building structure, isolation seism building base etc..
Damping device of the present invention has the advantages that：
(1) rubber air spring is only needed to make the no matter suffered axial force of damper for positive or reverse, institute
The rubber air spring that states can produce elastic compression deformation and consume energy, and both save a rubber air spring, and greatly
Shorten the length of damper.
(2) when dynamic loading is more than the defensive ability/resistance ability of early stage rigidity set by damper, bidirectional elastic deformation is symmetrical, therefore outer
The change of the positive negative direction of power load does not affect its compression and the effect that consumes energy.
(3) length for changing precompressed cable wire can change the early stage rigidity of whole damper, when early stage rigidity is more than zero,
External force was deformed cannot damper before the early stage rigidity is overcome, when therefore using it for building structure aseismatic, can be pre-
If earthquake protection grade, shock insulation cost is significantly reduced.
(4) described wire tensioner is adjusted, you can change the length of precompressed cable wire, and then change damper early stage just
Degree, but the effective active length of the rubber air spring is constant, will not change the original characterisitic parameter of rubber air spring.
Description of the drawings
Structural representation of Fig. 1～7 for a specific embodiment of damper of the present invention, wherein, Fig. 1 is front view
(section view), A-A sectional views of the Fig. 2 for Fig. 1, B-B sectional views of the Fig. 3 for Fig. 1, Fig. 4 are upward view, and Fig. 5 is local I in Fig. 1
Enlarged drawing, Fig. 6 are the enlarged drawing of local II in Fig. 1, and Fig. 7 is the enlarged drawing of local III in Fig. 2.
Structural representation of Fig. 8～11 for second specific embodiment of damper of the present invention, wherein, Fig. 8 is main view
Figure (section view), C-C sectional views of the Fig. 9 for Fig. 8, D-D sectional views of the Figure 10 for Fig. 8, Figure 11 is upward view.
Structural representation of Figure 12～14 for 3rd specific embodiment of damper of the present invention, wherein, based on Figure 12
View (section view), E-E sectional views of the Figure 13 for Figure 12, F-F sectional views of the Figure 14 for Figure 12.
Specific embodiment
Example 1
Referring to Fig. 1, the rubber air spring damper that can adjust early stage rigidity in this example is that one kind can be used to build
The energy-dissipating device of Seismic Strengthening, it include fairlead 1, are respectively provided at first end cap 2 and the second end cap at 1 two of fairlead
3, wherein, first end cap 2 with and the second end cap 3 be fixedly connected with the two ends of fairlead by screw respectively.Described leads
A rubber air spring 4 is provided with into set 1 vertically, and a drive member is put in described fairlead 1 by 2 center of the first end cap
It is pressed on the rubber air spring 4；Wherein, described drive member by be located at 4 upper end of rubber air spring and with fairlead 1
The dynamic dynamic pressure plate 5 for coordinating and the drive rod 5-1 for extending upward fairlead 1 by 5 upper surface of dynamic pressure plate are constituted, the drive rod 5-
1 end being located at outside fairlead 1 is provided with connection ring 5-2 with hinge hole 14, and connection ring 5-2 passes through spiral shell with drive rod 5-1
The mode of line connection is docking together.
Referring to Fig. 1～3 and Fig. 6 is combined, the cyst wall 4-1 of the rubber air spring 4 in this example is chained together by three
Bent capsule is formed, and outside the transition position of any two adjacent bent capsules, armlet is provided with girdle ring 4-2, and described cyst wall 4-1 two is by Seal end plate
4-3 is sealed, and the edge of cyst wall 4-1 ends is clamped therebetween by the Seal end plate 4-3 flange 4-4 that are connected, the capsule
Filled with compressed air in wall 4-1.Internal diameter of the external diameter of the rubber air spring 4 less than fairlead 1, forms one therebetween
Annular space.
Referring to Fig. 1 and 4, the outside of second end cap 3 is provided with two connection otic placodes 13, Mei Yilian being connected therewith
Ear connecting plate 13 is provided with hinge hole 14.
Referring to Fig. 1～7, in described fairlead 1, is provided with backpressure device, the backpressure device include two groups of precompressed cable wires, two
Block floating platen and eight wire tensioners 16；Wherein, two groups of described precompressed cable wires are be made up of three precompressed cable wires
One group of precompressed cable wire 8 and second group of precompressed cable wire 9 being made up of five precompressed cable wires；Two pieces of described floating platens are for being located at
State the first floating platen 6 between the dynamic pressure plate 5 of drive member and rubber air spring 4 and the second end cap 3 is located at rubber sky
The second floating platen 7 between gas spring 4, two pieces of floating platens are moved with the inwall of fairlead 1 respectively and are coordinated.
Referring to Fig. 1～7, two groups of precompressed cable wires are distributed in described respectively with linear state around 1 axisymmetrical of fairlead
In annular space, each precompressed cable wire is each parallel to 1 axis of fairlead, and first group of precompressed cable wire 8 is away from fairlead axis
Distance is equal to distance of second group of precompressed cable wire 9 away from fairlead axis；Wherein, the following difference of first group of precompressed cable wire 8
It is fixed on the second floating platen 7 by lifting bolt 12, top is each passed through the first floating platen 6 and is fixed on by lifting bolt 12
On the dynamic pressure plate 5；The top of second group of precompressed cable wire 9 is fixed on the first floating platen 6 by lifting bolt 12 respectively,
Following is fixed on the second end cap 3 through the second floating platen 7 by lifting bolt 12；Each on first floating platen 6
The position that first group of precompressed cable wire 8 of root is passed through is provided with the first through hole 10 that passes through for which, and the aperture of the first through hole 10 is more than institute
State the diameter of first group of precompressed cable wire 8；The position passed through in each second group of precompressed cable wire 9 on second floating platen 7
The second through hole 11 passed through for which is provided with, the aperture of second through hole 11 is more than the diameter of second group of precompressed cable wire 9；Described
The method that is fixed on by lifting bolt in respective members of two of precompressed cable wire be：Lifting bolt 12 is fixed on corresponding structure
On part, it is then to be connected on the suspension ring of lifting bolt by one of precompressed cable wire, and fixed by rope cramp (being not drawn in figure)
Extremely.
Fig. 1 is participated in, eight described wire tensioners 16 are serially connected in the middle part of each precompressed cable wire, series-mounting respectively
For：Each precompressed cable wire is blocked from middle part, formed two fag end system then will be blocked and is connected on corresponding wire tensioner
In the connection ring at 16 two and fixed dead with rope cramp (being to draw in figure).
Described precompressed cable wire in this example can be steel wire rope, or prestressing force steel hinge line, when being embodied as, can
Voluntarily choose according to actual needs.
Referring to Fig. 1～3 and Fig. 6, the relative surface of first floating platen 6 and the second floating platen 7 is equipped with internal diameter
The locating ring 15 matched with the Seal end plate 4-3 external diameters of rubber air spring 4, the sealing at 4 two of the rubber air spring
End plate 4-3 is embedded in the locating ring 15 on the first floating platen 6 and the second floating platen 7 respectively.
In order to realize purpose that is default and adjusting early stage rigidity, the installation of above-mentioned two precompressed cable wire and the following institute of tensioning method
State：(1) backpressure device in damper as described in Fig. 1～7 by this example, drive member, the second end cap 3 and rubber air spring 4
Assemble；(2) pressure is applied to two of the part of step (1) gained, compresses the rubber air spring 4, while detection
The distance between two pieces of floating platens；(3) rubber air spring 4 is compressed to completely when the distance between two pieces of floating platens are equal to
(this length according to the characterisitic parameter of rubber air spring 4 and can need default early stage Rigidity Calculation to the length of sufficient early stage rigidity
Obtain) when adjust wire tensioner 16, make each precompressed cable wire tensioning, then cancel the pressure applied in step (2), institute
State two groups of precompressed cable wires will by the rubber air spring 4 be clamped in all the time the first floating platen 6 and the second floating platen 7 it
Between.(4) fairlead 1 is put, and covers the first end cap 2, finally connection ring 5-2 is docked with drive rod 5-1, obtained final product described
The rubber air spring damper that can adjust early stage rigidity.If need to be adjusted to early stage rigidity, fairlead 1 need to be pulled down only
Then repeat the above steps (2)～(4).
Referring to Fig. 1, it is which that two groups of precompressed cable wires pull two pieces of floating platens respectively to compress the rubber air spring 4
To provide precompression, the length for changing precompressed cable wire can adjust the size of precompression, and then reach the mesh of default its rigidity early
's.When damper is subject to the external load of axial direction, no matter external load is pressure or pulling force, as long as which is less than above-mentioned precompressed
Power, rubber air spring 4 will not continue to deformation.When external load is more than the precompression, if external load is pressure,
The dynamic pressure plate 5 promotes first floating platen 6 to continue compressing rubber air spring 4 and produces elastic deformation power consumption, if outside
Load is pulling force, and two groups of precompressed cable wires pull two pieces of floating platen relative movement compressing rubber air springs 4 respectively and produce
Elastic deformation consumes energy.Because no matter the dynamic loading suffered by damper is for drawing or pressing, the final deformation for producing is same rubber
The compression of air spring 4, so the bidirectional elastic deformation of damper is necessarily symmetrical.
Example 2
Referring to Fig. 8～11, this example has following difference with example 1：
First group of precompressed cable wire 8 and second group of precompressed cable wire 9 are constituted by three precompressed cable wires.The rigging spiral
The quantity of button 16 is kept to six, and is serially connected in the middle part of each precompressed cable wire respectively.
This example implementation other than the above is same as Example 1.
Example 3
Referring to Figure 12～14, the rubber air spring damper that can adjust early stage rigidity in this example can be used for for one kind
The isolation mounting (also referred to as shock isolating pedestal) of building vertical earthquake isolating, this example is main compared with example 2 to have following difference：
1st, as shock isolating pedestal, for ease of installing, set connection otic placode eliminated in this example on the second end cap 3, and incite somebody to action
Second end cap 3 is extended radially outwards from edge, and is uniformly provided with link bolt hole 17 in edge, using the second end cap 3 as every
The base of shake bearing.The drive rod 5-1 of the drive member is a gold being bolted to connection with 5 upper surface of dynamic pressure plate
Category pipe, the end that the metal tube is located at outside fairlead 1 are provided with connection supporting plate 18, and, it is again provided with connecting on the connection supporting plate 18
Bolt hole 17.
2nd, the cyst wall 4-1 of the rubber air spring 4 is made up of the bent capsule that two are cascaded；First group of precompressed
Cable wire 8 and second group of precompressed cable wire 9 are made up of five precompressed cable wires respectively, and it is ten that the quantity of the wire tensioner 16 increases
, and it is serially connected in the middle part of each precompressed cable wire respectively.
This example other embodiment other than the above is same as Example 2.
Claims (5)
1. a kind of rubber air spring damper that can adjust early stage rigidity, the rubber air spring damper include being oriented to
Set, of the fairlead are provided with the first end cap, and other end is provided with the second end cap；Spring is coaxially provided with described fairlead,
By putting on the outside of the first end cap in described fairlead, the drive member includes dynamic pressure plate and drive rod to one drive member, its
Described in dynamic pressure plate be located at the head of the spring, the drive rod is located on dynamic pressure plate and extends along fairlead axis and lead
To set；Characterized in that,
Described spring is rubber air spring, the internal diameter of the external diameter of the rubber air spring less than fairlead, therebetween shape
Into an annular space；
Backpressure device is additionally provided with described fairlead, the backpressure device includes that quantity is at least two groups of pre- compressed steel of three respectively
Rope, two pieces of floating platens and quantity are the wire tensioner of two groups of precompressed cable wire sum, wherein,
One piece described of two pieces of floating platens are located between the dynamic pressure plate and rubber air spring, and another piece is located at the second end cap
Between rubber air spring；
Two groups of described precompressed cable wires are symmetrically distributed in the annular space with linear state rotating around the axis of fairlead, and
One of one group of precompressed cable wire is separately fixed on the floating platen adjacent with the second end cap, and other end passes through adjacent with dynamic pressure plate
Floating platen be separately fixed on dynamic pressure plate, of another group of precompressed cable wire is separately fixed at the floating adjacent with dynamic pressure plate
On pressing plate, other end is separately fixed on the second end cap through the floating platen adjacent with the second end cap；
Described wire tensioner is serially connected in the middle part of the precompressed cable wire；
On described floating platen, the through hole for wearing the precompressed cable wire is respectively equipped with the position through the precompressed cable wire, should
Diameter of the aperture of through hole more than worn precompressed cable wire；
Dynamic cooperation is respectively adopted between described fairlead and two pieces of floating platens；
Two groups of precompressed cable wires of tensioning, are equal to the distance between two pieces of floating platens and rubber air spring are compressed to default early stage
The length of rigidity.
2. a kind of rubber air spring damper that can adjust early stage rigidity according to claim 1, it is characterised in that
The rubber air spring damper that early stage rigidity can be adjusted is the damper that reinforces for building structure aseismatic.
3. a kind of rubber air spring damper that can adjust early stage rigidity according to claim 1, it is characterised in that
The rubber air spring damper that early stage rigidity can be adjusted is the vertical earthquake isolating equipment for Antiseismic building.
4. a kind of rubber air spring damper that can adjust early stage rigidity according to claim 1,2 or 3, its feature
It is, described precompressed cable wire is steel wire rope or prestressing force steel hinge line.
5. a kind of rubber air spring damper that can adjust early stage rigidity according to claim 4, it is characterised in that
Two pieces of floating platens are respectively equipped with a locating ring on relative surface, and two of the rubber air spring is embedded in institute respectively
In the locating ring that states.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610901557.1A CN106499078A (en) | 2016-10-17 | 2016-10-17 | A kind of rubber air spring damper that can adjust early stage rigidity |
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| CN201610901557.1A CN106499078A (en) | 2016-10-17 | 2016-10-17 | A kind of rubber air spring damper that can adjust early stage rigidity |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108532552A (en) * | 2018-05-25 | 2018-09-14 | 宁波大学 | Floating type energy-consuming device for ship-intercepting |
| CN110582824A (en) * | 2017-05-05 | 2019-12-17 | 西门子股份公司 | Device with gas pressure spring for a cable-type rotary oscillating movement system and use of the device for a switch |
| CN112982730A (en) * | 2021-03-16 | 2021-06-18 | 北京工业大学 | Self-resetting wall with tuning-swinging-friction composite grading energy consumption function |
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