CN104482108A - Centering friction damper special for column-type electrical equipment - Google Patents
Centering friction damper special for column-type electrical equipment Download PDFInfo
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- CN104482108A CN104482108A CN201410737042.3A CN201410737042A CN104482108A CN 104482108 A CN104482108 A CN 104482108A CN 201410737042 A CN201410737042 A CN 201410737042A CN 104482108 A CN104482108 A CN 104482108A
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- Prior art keywords
- wedge
- friction
- vibration damper
- belleville spring
- piston rod
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/08—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
- F16F13/002—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising at least one fluid spring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/08—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other
- F16F7/09—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other in dampers of the cylinder-and-piston type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
- F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
- F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts
- F16F9/18—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein
- F16F9/19—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein with a single cylinder and of single-tube type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Dampers (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention provides a centering friction damper special for column-type electrical equipment. The centering friction damper comprises a piston rod and a cylinder tube provided with a belleville spring. Two sides of the belleville spring are connected with sliding wedges respectively. Friction wedges are arranged in the sliding wedges. The piston rod is pushed from the outside of the cylinder tube toward the inside of the cylinder tube to extrude the friction wedges and the belleville spring, in this way, seismic response of the electrical equipment is reduced through friction energy consumption. Compared with the prior art, the centering friction damper which has high damping efficiency and compact structure is convenient to install, and cannot cause sliding displacement under self-supporting effect of column-type electrical equipment and residual deformation after unloading.
Description
Technical field
The present invention relates to a kind of friction damper of electrical equipment, be specifically related to a kind of centring type friction damper for pillar class electrical equipment.
Background technique
As the important component part of lifeline engineering, the shock resistance of power equipment is more and more subject to people's attention, in order to reduce the adverse effect that earthquake brings to electrical equipment, not only need good technology arrangement, and need that there is good antidetonation/damping performance.In electrical equipment damping control system, except vibration damper of good performance developed by needs, the mounting arrangements of vibration damper plays its performance to vibration damper also important impact.For the ease of applying vibration damper, under the condition meeting vibration damper self performance, needing vibration damper simple installation and power transmission is clear and definite, making vibration damper can give full play to its performance to protect electrical equipment.
Pillar class electrical equipment in electric substation mainly comprises lightning arrester, mutual inductor, support insulator, Switch equipment etc., and because how rack-mount its equipment is, center of gravity is high, and rigidity is little, and the natural frequency of vibration is on earthquake motion excellent frequency, and seismic vulnerability analysis is larger.Because column support type electrical equipment is generally made up of brittle ceramic materials, the excellent frequency scope of its natural frequency of vibration and seismic waves is close, and the support of column support type electrical equipment has enlarge-effect to geological process simultaneously, therefore more easily by the impact of earthquake.In the prior art, the vibration damper of some is installed on the support of column support type electrical equipment of being everlasting.But the damping parameter of the vibration damper of different model is different, the seismic fortification intensity be in without region electrical equipment is also not quite similar, and the vibration damper being simultaneously currently applied to electrical equipment mainly exists the problem of the following aspects:
(1) be non-ly directed to pillar class electrical equipment, initially play sliding power and be difficult to the requirement meeting pillar class electrical equipment;
(2) there is residual deformation after vibration damper complete discharge.
To sum up, need to propose a kind of vibration damper for column support type electrical equipment, to improve damping effect, ensure that column support type electrical equipment normally runs.
Summary of the invention
In order to meet the needs of prior art, the invention provides a kind of centring type friction damper for pillar class electrical equipment, described vibration damper comprises piston rod, and is provided with the cylinder barrel of belleville spring; The both sides of described belleville spring connect a sliding wedge respectively, are provided with friction voussoir in described sliding wedge;
When described piston rod is advanced inside it by cylinder barrel lateral, extrude described friction voussoir and belleville spring, thus reduced the seismic response of described electrical equipment by friction energy-dissipating.
Preferably, described cylinder barrel side embeds right gear cylinder, and opposite side embeds left sleeve; Described sliding wedge is separately positioned between belleville spring and right gear cylinder, and between belleville spring and left sleeve; During described vibration damper action, piston rod is moved by left sleeve side described in described right gear cylinder side direction, to extrude described sliding wedge and belleville spring;
The side that described cylinder barrel is connected with left sleeve is opened wide, be connected with right gear cylinder one side closed after wherein the heart offer a circular hole, for the formation of the moving walkway of described piston rod; The both sides of described right gear cylinder are all unlimited;
The side of described left sleeve is opened wide, and opposite side is closed, and surface is furnished with screw thread, for mating with the screw thread inside cylinder barrel;
Preferably, between described sliding wedge and described right gear cylinder, and tight split nut is equipped with between sliding wedge and described left sleeve; Described tight split nut is the threaded cylindrical-shaped structure of inwall cloth, is embedded in described right gear cylinder and left sleeve respectively;
The internal cavity of described tight split nut is the moving walkway of described piston rod, when piston bolt is moved by right gear cylinder side direction left sleeve side, compresses described sliding wedge and belleville spring by tight split nut;
Preferably, described piston rod is the threaded cylindrical-shaped structure of surperficial cloth, for being connected with described tight split nut;
Preferably, be provided with gap between described left sleeve and tight split nut, described gap is the mobile space of piston rod in vibration damper;
Preferably, described friction voussoir comprises interior friction voussoir and external friction voussoir; Described interior friction voussoir is connected with described belleville spring;
Described interior friction voussoir is the wedge-shaped structure comprising cylindrical chamber, and upper bottom surface and the bottom surface of described wedge-shaped structure are circle;
Described external friction voussoir is the wedge-shaped structure comprising cylindrical chamber, and upper bottom surface and the bottom surface of described wedge-shaped structure are circle;
Described cylindrical chamber is the moving walkway of described piston rod;
Preferably, described sliding wedge is the cylindrical-shaped structure comprising wedge shape cavity; Described wedge shape cavity comprises two cylindric wedge shape cavitys; Upper bottom surface and the bottom surface of cylindric wedge shape cavity are circle, and the upper bottom surface of two cylindric wedge shape cavitys is interconnected;
The outer surface friction factor of sliding wedge is 0.2, and internal surface friction factor is 0.1;
Preferably, interior friction voussoir and external friction voussoir embed in the cylindric wedge shape cavity of sliding wedge respectively, are provided with gap between the upper bottom surface of interior friction voussoir and external friction voussoir upper bottom surface;
Preferably, the initial compression amount of described belleville spring is 2mm, and maximum permission displacement is 6mm.
Compared with immediate prior art, excellent effect of the present invention is:
1, in technical solution of the present invention, the sliding wedge being provided with interior friction voussoir and external friction voussoir can limit interior friction voussoir and the relative displacement of external friction voussoir, thus ensures that vibration damper possesses enough damping efficiencies;
2, a kind of centring type friction damper for pillar class electrical equipment provided by the invention, possesses initial sliding power, and can initially play sliding power according to the Mass adjust-ment of equipment, ensure that vibration damper does not occur slide displacement under pillar class electrical equipment Gravitative Loads; Damping efficiency is high; Without residual deformation after unloading; Compact structure, is convenient to install.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1: a kind of centring type friction damper stereogram for pillar class electrical equipment in the embodiment of the present invention;
Fig. 2: a kind of centring type friction damper sectional view for pillar class electrical equipment in the embodiment of the present invention;
Sliding wedge sectional view in Fig. 3: Fig. 2;
Sliding wedge plan view in Fig. 4: Fig. 2;
Fig. 5: Fig. 2 China and foreign countries' friction voussoir sectional view;
Fig. 6: Fig. 2 China and foreign countries' friction voussoir plan view;
Friction voussoir sectional view in Fig. 7: Fig. 2;
Inner module voussoir plan view in Fig. 8: Fig. 2;
Wherein, 1-left sleeve; 2-cylinder barrel; 3-sliding wedge; The tight split nut of 4-; 5-external friction voussoir; Friction voussoir in 6-; The right gear cylinder of 7-; 8-piston rod; 9-belleville spring.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
The invention provides a kind of vibration damper for pillar class electrical equipment in electric substation, under normal operating condition, guarantee equipment is fixedly connected with support, under geological process, passes through friction energy-dissipating, the seismic response of reduction equipment, is out of shape in the rear shock absorber noresidue of geological process.
In the present embodiment, vibration damper comprises left sleeve 1, cylinder barrel 2, sliding wedge 3, friction voussoir, tight split nut 4, right gear cylinder 7, piston rod 8 and belleville spring 9, and friction voussoir comprises external friction voussoir 5 and interior friction voussoir 6.The quantity of sliding wedge 3, tight split nut 4, external friction voussoir 5 and interior friction voussoir 6 is 2, and the quantity of belleville spring is 30.
Belleville spring 9 is arranged in cylinder barrel 2, sliding wedge 3 is separately positioned on the both sides of belleville spring 9, it is inner that external friction voussoir 5 and interior friction voussoir 6 are embedded in sliding wedge 3 respectively, when piston rod 8 is advanced inside it by cylinder barrel 2 lateral, extrusion friction voussoir and belleville spring 9 thus reduced the seismic response of gas equipment by friction energy-dissipating.
After being assembled by vibration damper in the present embodiment, be arranged in the bottom of pedestal upper end connecting plate, be connected with equipment through connecting plate by piston rod epitaxial part, under normal operating condition, guarantee equipment is fixedly connected with support.
1, the annexation of left sleeve 1, cylinder barrel 2 and right gear cylinder 7;
1.: cylinder barrel 2 side embeds right gear cylinder 7, opposite side embeds left sleeve 1;
During vibration damper action, piston rod 8 is moved by right gear cylinder 7 side direction left sleeve 1 side, with extrusion friction voussoir and belleville spring 9;
As shown in Figure 1, the cross-sectional outer diameter of cylinder barrel 2 is 56mm, and cross section internal diameter is 40mm, and cylinder barrel length is 164mm; The side that cylinder barrel 2 is connected with left sleeve 1 is opened wide, and inside is provided with screw thread, and the screw thread that this screw thread is used for arranging with left sleeve 1 surface mates, and to embed in cylinder barrel 2 by left sleeve 1, closes cylinder barrel 2.It is the circular hole of 16mm that a diameter is offered at the one side closed Hou center that cylinder barrel 2 is connected with right gear cylinder 7, for the formation of the moving walkway of piston rod 8.
The cross-sectional outer diameter of right gear cylinder 7 is 40mm, and cross section internal diameter is 28mm, and right gear tube length is 20mm, both sides be open wide and the length of 20mm be all embedded in cylinder barrel 2.
The cross-sectional outer diameter of left sleeve 1 is 40mm, and cross section internal diameter is 28mm, and left sleeve is long is 34mm, and side is opened wide, and opposite side is closed, and surface is furnished with screw thread, and left sleeve 1 still has 8mm to stay outside cylinder barrel 2 after embedding cylinder barrel 2 as shown in Figure 1, to seal cylinder barrel 2 completely.
: between sliding wedge 3 and right gear cylinder 7, and between sliding wedge 3 and left sleeve 1, be equipped with tight split nut 4 2.; Tight split nut 4 is the threaded cylindrical-shaped structure of inwall cloth, is embedded in right gear cylinder 7 and left sleeve 1 respectively;
The cross-sectional outer diameter of tight split nut 4 cylindrical-shaped structure is 26mm as shown in Figure 1, and cross section internal diameter is 16mm, and length is 10mm;
The internal cavity of tight split nut 4 is the moving walkway of piston rod 8, when piston rod 8 is advanced inside it by cylinder barrel 2 lateral, by tight split nut 4 pressing friction voussoir and belleville spring 9.
3.: the cylindrical-shaped structure of piston rod 8 to be diameter of sections be 16mm; The surface of this cylindrical-shaped structure is furnished with screw thread, for being connected with tight split nut 4.Piston rod adopts No. 45 steel.
As shown in Figure 1, comprise the gap of 16mm between left sleeve 1 and tight split nut 4, this gap is the mobile space of piston rod 8 in vibration damper.
4.: left sleeve 1, cylinder barrel 2 and right gear cylinder 7 all adopt Q235 steel to form.
2, rub voussoir;
Friction voussoir comprises interior friction voussoir 6 and external friction voussoir 5; Interior friction voussoir 6 is connected with belleville spring 9;
1.: as shown in FIG. 7 and 8, interior friction voussoir 6 is the wedge-shaped structure comprising cylindrical chamber, and upper bottom surface and the bottom surface of wedge-shaped structure are circle, and upper bottom surface diameter is 22.8mm, and bottom surface diameter is 29.3mm; Width between upper bottom surface and bottom surface is 10mm; The diameter of section of the cylindrical chamber of wedge-shaped structure inside is 16mm; Angle between the side of wedge-shaped structure and bottom surface is 72 °.This cylindrical chamber is the moving walkway of piston rod.
2.: as illustrated in Figures 5 and 6, external friction voussoir 5 is the wedge-shaped structure comprising cylindrical chamber, and upper bottom surface and the bottom surface of wedge-shaped structure are circle, and upper bottom surface diameter is 22.8mm, and bottom surface diameter is 28mm; Width between upper bottom surface and bottom surface is 8mm; The diameter of section of the cylindrical chamber of wedge-shaped structure inside is 16mm; Angle between the side of wedge-shaped structure and bottom surface is 72 °.This cylindrical chamber is the moving walkway of piston rod.
3, sliding wedge;
As shown in Figures 3 and 4, sliding wedge 3 is the cylindrical-shaped structure comprising wedge shape cavity; This wedge shape cavity comprises two cylindric wedge shape cavitys; Upper bottom surface and the bottom surface of each cylindric wedge shape cavity are circle, and upper bottom surface diameter is 21.5mm, and bottom surface diameter is 28mm; The upper bottom surface of two cylindric wedge shape cavitys is interconnected; The diameter of section of sliding wedge 3 is 40mm.
Interior friction voussoir 6 and external friction voussoir 5 embed in the cylindric wedge shape cavity of sliding wedge 3 respectively, and the gap between the upper bottom surface of interior friction voussoir 6 and external friction voussoir 5 upper bottom surface is 4mm.
The outer surface of sliding wedge and internal surface are all through friction treatment, and outer surface friction factor is 0.2, and internal surface friction factor is 0.1.
4, belleville spring;
Belleville spring 9, according to GB/T1927-2005 " belleville spring ", chooses the belleville spring that model is A35.5-1.The initial compression amount of belleville spring is 2mm, and maximum permission displacement is 6mm, and initial initial tension of spring is 5.19kN, and it is 13.86kN that vibration damper initially plays sliding power.
Finally should be noted that: described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
Claims (9)
1. for a centring type friction damper for pillar class electrical equipment, it is characterized in that, described vibration damper comprises piston rod, and is provided with the cylinder barrel of belleville spring; The both sides of described belleville spring connect a sliding wedge respectively, are provided with friction voussoir in described sliding wedge;
When described piston rod is advanced inside it by cylinder barrel lateral, extrude described friction voussoir and belleville spring, thus reduced the seismic response of described electrical equipment by friction energy-dissipating.
2. vibration damper as claimed in claim 1, it is characterized in that, described cylinder barrel side embeds right gear cylinder, and opposite side embeds left sleeve; Described sliding wedge is separately positioned between belleville spring and right gear cylinder, and between belleville spring and left sleeve; During described vibration damper action, piston rod is moved by left sleeve side described in described right gear cylinder side direction, to extrude described sliding wedge and belleville spring;
The side that described cylinder barrel is connected with left sleeve is opened wide, be connected with right gear cylinder one side closed after wherein the heart offer a circular hole, for the formation of the moving walkway of described piston rod; The both sides of described right gear cylinder are all unlimited;
The side of described left sleeve is opened wide, and opposite side is closed, and surface is furnished with screw thread, for mating with the screw thread inside cylinder barrel.
3. vibration damper as claimed in claim 2, is characterized in that, between described sliding wedge and described right gear cylinder, and be equipped with tight split nut between sliding wedge and described left sleeve; Described tight split nut is the threaded cylindrical-shaped structure of inwall cloth, is embedded in described right gear cylinder and left sleeve respectively;
The internal cavity of described tight split nut is the moving walkway of described piston rod, when piston bolt is moved by right gear cylinder side direction left sleeve side, compresses described sliding wedge and belleville spring by tight split nut.
4. vibration damper as claimed in claim 3, it is characterized in that, described piston rod is the threaded cylindrical-shaped structure of surperficial cloth, for being connected with described tight split nut.
5. vibration damper as claimed in claim 2 or claim 3, is characterized in that, be provided with gap between described left sleeve and tight split nut, described gap is the mobile space of piston rod in vibration damper.
6. vibration damper as claimed in claim 1, it is characterized in that, described friction voussoir comprises interior friction voussoir and external friction voussoir; Described interior friction voussoir is connected with described belleville spring;
Described interior friction voussoir is the wedge-shaped structure comprising cylindrical chamber, and upper bottom surface and the bottom surface of described wedge-shaped structure are circle;
Described external friction voussoir is the wedge-shaped structure comprising cylindrical chamber, and upper bottom surface and the bottom surface of described wedge-shaped structure are circle;
Described cylindrical chamber is the moving walkway of described piston rod.
7. vibration damper as claimed in claim 1, it is characterized in that, described sliding wedge is the cylindrical-shaped structure comprising wedge shape cavity; Described wedge shape cavity comprises two cylindric wedge shape cavitys; Upper bottom surface and the bottom surface of cylindric wedge shape cavity are circle, and the upper bottom surface of two cylindric wedge shape cavitys is interconnected;
The outer surface friction factor of sliding wedge is 0.2, and internal surface friction factor is 0.1.
8. vibration damper as claimed in claims 6 or 7, it is characterized in that, interior friction voussoir and external friction voussoir embed in the cylindric wedge shape cavity of sliding wedge respectively, are provided with gap between the upper bottom surface of interior friction voussoir and external friction voussoir upper bottom surface.
9. vibration damper as claimed in claim 1, it is characterized in that, the initial compression amount of described belleville spring is 2mm, and maximum permission displacement is 6mm.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410737042.3A CN104482108B (en) | 2014-12-05 | 2014-12-05 | A kind of centring type friction damper for pillar class electrical equipment |
| PCT/CN2015/087808 WO2016086691A1 (en) | 2014-12-05 | 2015-08-21 | Centering friction damper for column-type electrical device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410737042.3A CN104482108B (en) | 2014-12-05 | 2014-12-05 | A kind of centring type friction damper for pillar class electrical equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104482108A true CN104482108A (en) | 2015-04-01 |
| CN104482108B CN104482108B (en) | 2016-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410737042.3A Active CN104482108B (en) | 2014-12-05 | 2014-12-05 | A kind of centring type friction damper for pillar class electrical equipment |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104482108B (en) |
| WO (1) | WO2016086691A1 (en) |
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| CN104864026A (en) * | 2015-04-15 | 2015-08-26 | 武汉理工大学 | Compound electromagnetic friction damper |
| CN105317914A (en) * | 2015-11-06 | 2016-02-10 | 中国电力科学研究院 | Shock absorber used for strut type electrical equipment |
| CN105370787A (en) * | 2015-11-06 | 2016-03-02 | 中国电力科学研究院 | Self-reset composite type damper trigger force checking method for electrical equipment |
| WO2016086691A1 (en) * | 2014-12-05 | 2016-06-09 | 国家电网公司 | Centering friction damper for column-type electrical device |
| CN106051027A (en) * | 2015-04-07 | 2016-10-26 | 通用汽车环球科技运作有限责任公司 | Gas strut rod system |
| CN108443386A (en) * | 2018-03-05 | 2018-08-24 | 深圳市齐创美科技有限公司 | A kind of frictional damper based on frictional force control |
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| CN2149514Y (en) * | 1992-12-02 | 1993-12-15 | 华北石油管理局油气井测试公司 | Transverse shock absorber |
| CN2345773Y (en) * | 1998-10-12 | 1999-10-27 | 济南灯饰总公司 | Internal installed shock absorber |
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