CN201133440Y - Elastic colloid buffer - Google Patents

Elastic colloid buffer Download PDF

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Publication number
CN201133440Y
CN201133440Y CNU2007201904846U CN200720190484U CN201133440Y CN 201133440 Y CN201133440 Y CN 201133440Y CN U2007201904846 U CNU2007201904846 U CN U2007201904846U CN 200720190484 U CN200720190484 U CN 200720190484U CN 201133440 Y CN201133440 Y CN 201133440Y
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CN
China
Prior art keywords
piston
cylinder
elastic gel
hole
buffer
Prior art date
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CNU2007201904846U
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Chinese (zh)
Inventor
宫树森
王庆
于龙
程云艳
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北京金自天和缓冲技术有限公司
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Abstract

The utility model relates to an elastic rubber buffer which is provided with a cylinder and a piston rod; one end of the cylinder is open and the other end is closed; the open end is provided with a cylinder cover; the cylinder is fully filed with elastic rubber with specified pressure; the piston rod goes through the cylinder cover, extends into the cylinder and can move axially; a piston is fixed on one end of the piston rod which is arranged in the cylinder, and the other end of the piston rod extends out of the cylinder; a first piston ring is inlaid on the peripheral of the piston; the piston slides in a sealed space relative to the inner wall of the cylinder; a plurality of damping holes and one-way valves are axially arranged on the piston. The elastic rubber buffer of the utility model regulates the performance by regulating the size of the damping holes, overcomes the deficiencies of the prior art and enlarges the damping force regulating scope; adoption of two independent seals greatly extends the service life of the buffer; the elastic rubber buffer has the advantages of simple structure, small size, excellent and stable performance.

Description

A kind of elastic gel buffer

Technical field

The utility model relates to a kind of buffer, and especially a kind of elastic gel material that adopts is the elastic gel buffer of buffer medium.

Background technique

Mostly present known buffer is pneumatic spring, hydraulic bjuffer, Liquid and gas damper, spring buffer etc., is used for occasions such as safeguard industries equipment, reduction noise.The medium of such buffer mostly is hydraulic oil or nitrogen etc. greatly, because the sealing technique problem, existence is leaked, working life is short, distinct disadvantage such as damper volume is big, absorptivity is low, inconvenient maintenance.

People have developed a kind of elastic gel as buffer medium for this reason, and this buffer medium has certain viscosity, compressibility, need not the external force reversibility.Described elastic gel is a kind of high molecular synthetic material, and this material is widely used in manufacturing and designing of industrial vibration damper abroad already, and obtains constantly improving and development in the many decades in the past.The performance characteristics of elastic gel:

1, viscosity: viscosity is that the thickness performance by elastic gel forms between 500000 to 20000000cst, and this situation has produced high viscous friction, and its value is higher than viscosity far away and has only 50 to 500cst normal hydraulic oil performance.Viscosity has determined the performance of its bumper and absorbing shock.

2, compression performance: when elastic gel because of applying external force by compression the time, the internal pressure of elastic gel significantly rises, when pressure was increased to 4000bar, its shrinkage was approximately 15%, compressibility has determined its elastic performance.

3, advantage: the most significant advantage of elastic gel is: in an one-piece apparatus, elastic gel can provide energy consumption and energy storage according to the required ratio of dealing with problems, thereby has eliminated vibration, has absorbed external impact energy.It has high viscosity, compressibility, significant thermostability and chemical stability, series of advantages such as aging.

Figure 1 shows that a kind of known elastic gel buffer 20.There is following defective in the buffer of this structure:

1, the dynamical reaction of buffer 20 relies on elastic gel to flow through annular space 201 generations, the bad control of the size of annular space 201, and the gap length instability causes bumper property stable inadequately.

2, in order to produce enough big dynamical reaction, annular space 201 is generally very little, in movement process, because the shortage of guiding, easily cause piston outer wall and inner wall of cylinder to scratch, thereby destroy original performance of buffer, increase the unsafe factor of parts such as cylinder barrel, piston, reduce the working life of buffer.

3, only be provided with guiding element 202 to piston rod at the cylinder cap place, guiding length is too small, in impact process, piston rod stretches into cylinder barrel inside, this moment, piston just formed a suspended wall end, piston rod in the process that impacts easily occurs bending and deformation, and when the annular space between piston and cylinder barrel was very little, piston easily produced deflection and scratches inner wall of cylinder.

Damping force is excessive when 4, replying, responded slow, the cryogenic property extreme difference.

China Patent No. ZL200410062249.1 also discloses " a kind of viscous damping buffer ", and this known structure is after external force is cancelled, and piston, piston rod rest on position at that time, and resilience does not take place, and should belong to a kind of vibration damper.The damping mode that adopts in this structure is that aperture adds the gap, therefore, still there is the bad control of size of above-mentioned annular space, the gap length instability, cause bumper property stable inadequately, and only having piston rod one end to support, piston has just formed a suspended wall end, the defective that the piston rod in the process that impacts easily occurs bending and deformation in movement process.

The model utility content

The purpose of this utility model provides a kind of elastic gel buffer, and this elastic gel buffer can overcome the defective of above-mentioned known technology effectively, avoids piston to produce when motion and between cylinder barrel and interferes, and has improved robust motion.

Another purpose of the present utility model provides a kind of elastic gel buffer, and it can effectively change the bumper property curve, strengthen the cryogenic property of buffer.

Another purpose of the present utility model provides a kind of elastic gel buffer, and it can easily regulate the damping force of buffer.

For this reason, a kind of elastic gel buffer that the utility model provides, wherein, described elastic gel buffer has:

Cylinder body, an end are opening end, and the other end is a closed end, is provided with cylinder cap at opening end; Be full of the elastic gel of authorized pressure in the described cylinder body;

Piston rod runs through described cylinder cap and extends in the described cylinder body and can move vertically; The end that described piston rod is positioned at cylinder body is fixed with piston, and the other end extends to the outside of described cylinder body;

The periphery of described piston is equipped with the first piston ring, and described piston constitutes sealing with respect to described inboard wall of cylinder block and slides; Described piston upper edge is axially arranged with a plurality of damping holes and one-way valve.

Aforesaid elastic gel buffer, wherein, described one-way valve has valve body and spring, and this one-way valve is housed in the through hole that is provided with on the described piston; One end of described through hole forms a undergauge small-diameter hole, the side that the opening end of described small-diameter hole is connected with described piston rod towards described piston; Described valve body can be contained in the described through hole to closed described undergauge small-diameter hole, and is positioned at the front portion of this undergauge small-diameter hole; Described spring one end is resisted against described valve body, and the other end is resisted against fixing bolt, and described bolt is connected with described through hole, and has circulation passage between described bolt and the piston.

Aforesaid elastic gel buffer, wherein, the middle part of described bolt has through hole, and this through hole constitutes the circulation passage between bolt and the piston.

Aforesaid elastic gel buffer, wherein, the inner circle wall upper edge of the through hole of described bolt or piston is axially arranged with at least one groove.

Aforesaid elastic gel buffer, wherein, the outer circumferential face of described bolt has at least one plane vertically.

Aforesaid elastic gel buffer, wherein, described damping hole and one-way valve are distributed on the described piston, and described damping hole and described one-way valve are crisscross arranged.

Aforesaid elastic gel buffer, wherein, described cylinder cap be provided with the support guide ring that at least one ring matches with described piston rod interior week.

Aforesaid elastic gel buffer, wherein, at the Sealing that equates with described support guide number of rings amount that is provided with in interior week of described cylinder cap, described support guide ring is arranged on described Sealing near cylinder cap foreign side one side.

Aforesaid elastic gel buffer, wherein, described cylinder cap be provided with second piston ring that matches and carry out with described piston rod interior week.

Aforesaid elastic gel buffer, wherein, described second piston ring is provided with near the inboard of described cylinder body; Described support guide ring and Sealing all are arranged on the outside of described second piston ring.

The characteristics and the advantage of elastic gel buffer of the present utility model are:

1, the utility model is simple in structure, has realized improving the purpose of shock-absorbing capacity and stability by this simple structure.

2, since with elastic gel as medium, and elastic gel is a kind of viscid macromolecular material, so reduced the requirement to sealing, can prolong the working life of buffer.

3, elastic gel buffer of the present utility model bears press member and has higher intensity, and has good supporting, so stress is better, and motion steadily.

4, elastic gel buffer Seal Design of the present utility model is reasonable, and cylinder cap is provided with piston ring, can alleviate the active force of high pressure colloid to sealing in movement process; Support guide ring and piston rod matching gap are little simultaneously, have at utmost reduced the cold flow of sealing.Above measure will improve the working life of buffer greatly.

5, the utility model sealing employing twice are independent sealed (is that two seals acts on separately, both made one seal failure, do not influence other sealing together) yet, two seals all has independently support guide, reduce the cold flow of sealing, improve the working life of sealing greatly, prolong the working life of buffer simultaneously.

6, elastic gel buffer of the present utility model comes adjusting function by the size of regulating damping hole, has overcome the defective of passing through the annular space adjusting function in the known technology.Because the controllability of little hole area is far longer than the controllability of annulus area, therefore, performance is convenient to regulate, and the stability height.And, because between piston and the cylinder body, all lead by piston ring and support guide ring between piston rod and the cylinder cap, therefore in movement process, two positions of piston and piston rod have guiding simultaneously, have improved the stationarity of movement process greatly.Simultaneously, for avoiding taking place the problem that piston and inner wall of cylinder interfere, the annular space can not be very little in the known configurations, and damping hole of the present utility model can be processed very for a short time, so enlarged the regulation range of damping force.

7, by on piston of the present utility model, one-way valve being set, change the performance curve of buffer greatly, strengthened the cryogenic property of buffer.In movement process, one-way valve is shut during process (being process of press in), and damping is produced by damping hole, produces dynamical reaction; One-way valve is opened fully during backhaul (being ejection process), and damping is made up of damping hole and the one-way valve of opening, and is equivalent to increase damping hole, has improved the low temperature resistivity energy of buffer and the Response factor of buffer thereof.

8, buffer structure of the present utility model is simple, volume is little, function admirable and stable.

Description of drawings

The following drawings only is intended to the utility model done and schematically illustrates and explain, does not limit scope of the present utility model.Wherein,

Fig. 1 is a kind of known elastic gel buffer schematic representation;

Fig. 2 is the structural representation of elastic gel buffer of the present utility model;

Fig. 3 is the local enlarged diagram at I place among Fig. 2;

Fig. 4 is an elastic gel buffer process of press in schematic representation of the present utility model;

Fig. 5 is an elastic gel buffer ejection process schematic representation of the present utility model;

Fig. 6 is that the master of the piston of elastic gel buffer of the present utility model looks schematic representation;

Fig. 7 is the cross-sectional schematic along A-A line among Fig. 6;

Fig. 8 is the schematic rear view of the piston of elastic gel buffer of the present utility model;

Fig. 9 A, Fig. 9 B are embodiment's schematic representation of bolt arrangement of the one-way valve of elastic gel buffer of the present utility model;

Figure 10 A, Figure 10 B are another embodiment's schematic representation of bolt arrangement of the one-way valve of elastic gel buffer of the present utility model;

Figure 11 A, Figure 11 B are another embodiment's schematic representation of bolt arrangement of the one-way valve of elastic gel buffer of the present utility model;

Figure 12 is the cross-sectional schematic of elastic gel buffer of the present utility model, and its slice location is the position along the B-B line of piston among Fig. 6.

Embodiment

Understand for technical characteristics of the present utility model, purpose and effect being had more clearly, now contrast description of drawings embodiment of the present utility model.

Shown in Fig. 2,3,12, elastic gel buffer 10 of the present utility model has: an end is an opening end, and the other end is the cylinder body 101 of closed end, is provided with cylinder cap 102 at the cylinder body opening end; Be full of elastic gel 103 in the described cylinder body 101.One piston rod 104 passes described cylinder cap 102 and extends in the described cylinder body 101 and can move vertically; The end that described piston rod 104 is positioned at cylinder body 101 is fixed with piston 105, and the other end extends to the outside of described cylinder body 101; The periphery of described piston 105 is equipped with first piston ring 1051, and when described piston 105 slided in described cylinder body, this piston ring 1051 played the dual functions of sealing and guiding.Please cooperate referring to Fig. 6,7,8, described piston 105 upper edges are axially arranged with a plurality of damping holes 1055 and one-way valve 1053.

Shown in Fig. 3,6,7,8, described one-way valve 1053 comprises valve body 10531 and spring 10532, and is housed in the through hole 1052 that is provided with on the described piston 105, and an end of described through hole 1052 forms a undergauge small-diameter hole 1056; Described valve body 10531 is contained in the described through hole 1052, and is positioned at the front portion of described undergauge small-diameter hole 1056, and can closed described undergauge small-diameter hole 1056 under the effect of described spring 10532; One end of described spring 10532 is resisted against described valve body 10531, and the other end is resisted against fixing bolt 10533, and described bolt 10533 is connected with described through hole 1052, and has circulation passage 1054 between described bolt 10533 and the piston 105.In structure of the present utility model, the side that the opening end of described small-diameter hole 1056 is connected with described piston rod 104 towards described piston 105 so that described one-way valve 1053 is closed in the piston process of press in, is opened in piston 105 springback processes.

Preferably, the middle part of described bolt 10533 has through hole 10534, and shown in Fig. 9 A, Fig. 9 B, wherein, Fig. 9 A is a schematic top plan view, and Fig. 9 B is a generalized section.When the described valve body 10531 of described elastic gel 103 right side pushing tow in figure, when making valve body 10531 leave described undergauge small-diameter hole 1056, the circulation passage that described elastic gum physical efficiency constitutes by this through hole 10534 from an effluent of described piston 105 to opposite side.

Another preferred examples is, shown in Figure 10 A, Figure 10 B, wherein, Figure 10 A mainly looks schematic representation, and Figure 10 B is the generalized section along the C-C line among Figure 10 A.On described bolt 10533 or the inner circle wall upper edge of the through hole 1052 of piston 105 be axially arranged with the groove 10535 that at least one can make described elastic gel pass through, represented on bolt 10533, to be provided with the structure of two grooves 10535 among Figure 10 A, the 10B.

Another preferred examples is, shown in Figure 11 A, Figure 11 B, wherein, Figure 11 A is a schematic top plan view, and Figure 11 B is that the E of Figure 11 A is to schematic representation.The outer circumferential face of described bolt 10533 is processed at least one plane 10536 vertically, form the gap thereby make between described bolt 10533 and the described through hole 1052, this gap constitutes the circulation passage 1054 that described elastic gel is passed through.Shown in Fig. 2,3,11A, 11B, can process two planes 10536 that parallel in the bi-side of described bolt 10533 respectively, make and form two circulation passages 1054 between described bolt and the through hole.

In the present embodiment, described damping hole 1055 and one-way valve 1053 are distributed on the described piston 105, and described damping hole 1055 is crisscross arranged with described one-way valve 1053.

In addition, be provided with second piston ring 1022 that matches with described piston rod 104 near week (right direction among the figure) in the described cylinder cap 102 of cylinder body 105 inboards.In the movement process of described piston rod 104, this second piston ring 1022 can play the effect of sealing and guiding simultaneously, can alleviate in the process of press in of piston rod 104 instantaneous pressure that produces in the cylinder barrel.

The utility model with cylinder cap 102 that piston rod 104 matches in to be provided with the twice that are made of Sealing 1023 week independent sealed, promptly two Sealings 1023 act on separately, even one seal failure do not influence the sealability of an other Sealing 1023 yet.And independently support guide ring 1021 is all arranged at two Sealings 1023, described support guide ring 1021 is arranged on described Sealing 1023 near cylinder cap 102 foreign sides one side, play the cold flow that reduces sealing, in the working life of improving Sealing 1023 greatly, prolong working life of buffer simultaneously.Described two support guide rings 1021 and Sealing 1023 all are arranged on the outside (left direction among the figure) of described second piston ring 1022.The utility model by be arranged on described second piston ring 1022 on the described cylinder cap 102, two support guide rings 1021 support with the guiding that the first piston ring 1051 that is arranged on described piston 105 outer circumferential faces constitutes piston rod and two positions of piston, make the motion of piston 105 and piston rod 102 more steady.

The known support guide ring with self-lubricating function of above-mentioned support guide ring 1021 preferred employings is to reduce the surface friction drag in the movement process.

Working principle of the present utility model is: as shown in Figure 4, represented the process of press in of piston.Under the effect of external force F, described piston rod 104 drives piston 105 right direction in figure and moves, promptly, elastic gel 103 to B chamber, piston 105 right side is exerted pressure, then the elastic gel in piston right side B chamber is by being arranged on the C chamber, left side that damping hole 1055 on the piston 105 flows to piston, and arrow D represents the flow direction of elastic gel among the figure.Because the utility model has adopted the structure of damping hole, therefore can control the size of damping force easily.That is, can damping hole 1055 be processed into the size of regulation according to usage requirement, to reach the size of desired damping force.And this moment, described one-way valve 1053 is closed under the effect of the elastic gel in B chamber, and the undergauge small-diameter hole 1056 on the piston 105 is shut by valve body 10531, and then elastic gel can not flow through from through hole 1052.

Different with the structure of the known size of controlling damping force by the gap between piston and cylinder body, damping hole of the present utility model can be very little, still may guarantee steadily moving between piston and the cylinder body, and can not produce exist in the known structure when the annular space between piston and the cylinder body very hour, the problem that causes piston and inboard wall of cylinder block to interfere.

As shown in Figure 5, represented when having removed external force F the ejection process of piston rod 104.Piston rod 104 is in process of press in, and elastic gel 103 flows by the damping hole on the piston 105 1055 and produces damping force.When piston 105 arrived the final position, the mobile of described elastic gel 103 stopped, and the elastic gel 103 in left and right chamber C, the B of piston 105 is isobaric substantially at this moment.When acting on after external force F on the piston rod 104 cancels, because the compressibility and the recovery thereof of elastic gel 103 itself, piston rod 104 will be returned to initial position.In springback process, because the recovery of elastic gel 103, its restoring force pushes back initial position with piston rod 104, because the existence of elastic gel restoring force, elastic gel in the cylinder C chamber flows to the B chamber by described damping hole 1055, the valve body 10531 of while pushing tow described one-way valve in right side in figure, described undergauge small-diameter hole 1056 is opened, being about to one-way valve opens fully, at this moment, damping is made up of damping hole 1055 and the one-way valve of opening 1053, is equivalent to increase damping hole, has reduced the backhaul damping, improved opening speed, thereby by one-way valve 1053 is set, changed the performance curve of buffer greatly, strengthened the Response factor and the cryophylactic performance of buffer.The above only is the schematic embodiment of the utility model, is not in order to limit scope of the present utility model.Any those skilled in the art, equivalent variations of having done under the prerequisite that does not break away from design of the present utility model and principle and modification all should belong to the scope that the utility model is protected.

Claims (10)

1, a kind of elastic gel buffer is characterized in that, described elastic gel buffer has:
Cylinder body, an end are opening end, and the other end is a closed end, is provided with cylinder cap at opening end; Be full of the elastic gel of authorized pressure in the described cylinder body;
Piston rod runs through described cylinder cap and extends in the described cylinder body and can move vertically; The end that described piston rod is positioned at cylinder body is fixed with piston, and the other end extends to the outside of described cylinder body;
The periphery of described piston is equipped with the first piston ring, and described piston constitutes sealing with respect to described inboard wall of cylinder block and slides; Described piston upper edge is axially arranged with a plurality of damping holes and one-way valve.
2, elastic gel buffer as claimed in claim 1 is characterized in that, described one-way valve has valve body and spring, and this one-way valve is housed in the through hole that is provided with on the described piston; One end of described through hole forms a undergauge small-diameter hole, the side that the opening end of described small-diameter hole is connected with described piston rod towards described piston; Described valve body can be contained in the described through hole to closed described undergauge small-diameter hole, and is positioned at the front portion of this undergauge small-diameter hole; Described spring one end is resisted against described valve body, and the other end is resisted against fixing bolt, and described bolt is connected with described through hole, and has circulation passage between described bolt and the piston.
3, elastic gel buffer as claimed in claim 2 is characterized in that, the middle part of described bolt has through hole, and this through hole constitutes the circulation passage between bolt and the piston.
4, elastic gel buffer as claimed in claim 2 is characterized in that, the inner circle wall upper edge of the through hole of described bolt or piston is axially arranged with at least one groove.
5, elastic gel buffer as claimed in claim 2 is characterized in that, the outer circumferential face of described bolt has at least one plane vertically.
6, elastic gel buffer as claimed in claim 1 is characterized in that, described damping hole and one-way valve are distributed on the described piston, and described damping hole and described one-way valve are crisscross arranged.
7, elastic gel buffer as claimed in claim 1 is characterized in that, described cylinder cap be provided with the support guide ring that at least one ring matches with described piston rod interior week.
8, elastic gel buffer as claimed in claim 7 is characterized in that, at the Sealing that equates with described support guide number of rings amount that is provided with in interior week of described cylinder cap, described support guide ring is arranged on described Sealing near cylinder cap foreign side one side.
9, as claim 7 or 8 described elastic gel buffers, it is characterized in that, described cylinder cap be provided with second piston ring that matches and carry out with described piston rod interior week.
10, elastic gel buffer as claimed in claim 8 is characterized in that, described second piston ring is provided with near the inboard of described cylinder body; Described support guide ring and Sealing all are arranged on the outside of described second piston ring.
CNU2007201904846U 2007-11-30 2007-11-30 Elastic colloid buffer CN201133440Y (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102102723A (en) * 2011-02-21 2011-06-22 海尔集团公司 Fluid variable damping shock absorber and washing machine equipped with same
CN102967533A (en) * 2012-09-12 2013-03-13 中北大学 High pressure seal test device for measuring daub cushioning performance
CN103016600A (en) * 2012-12-26 2013-04-03 东南大学 Viscoelastic ball shock absorber
CN103062273A (en) * 2013-01-21 2013-04-24 陕西理工学院 Damping-adjustable elastic clay buffer for vehicle
CN103539016A (en) * 2013-11-12 2014-01-29 湖州洋西起重设备有限公司 Elastic buffer of festoon cable
CN103883665A (en) * 2014-04-15 2014-06-25 叶晓锋 Instantaneous speed reducer
CN104653690A (en) * 2013-11-20 2015-05-27 哈恩气动弹簧有限责任公司 Spring element
CN102102723B (en) * 2011-02-21 2016-12-14 青岛海尔洗衣机有限公司 A kind of fluid damping changing impact damper and the washing machine equipped with this amortisseur
CN106678242A (en) * 2017-01-17 2017-05-17 扬州市大洋水务设备有限公司 Pneumatic buffer
CN108679148A (en) * 2018-05-25 2018-10-19 中国人民解放军陆军装甲兵学院 Colloidal damper
CN110733528A (en) * 2019-12-04 2020-01-31 北京强度环境研究所 Elastic daub buffering device for motor train unit
CN110901681A (en) * 2019-12-03 2020-03-24 北京强度环境研究所 Elastic cement buffer for metro vehicle

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102102723A (en) * 2011-02-21 2011-06-22 海尔集团公司 Fluid variable damping shock absorber and washing machine equipped with same
CN102102723B (en) * 2011-02-21 2016-12-14 青岛海尔洗衣机有限公司 A kind of fluid damping changing impact damper and the washing machine equipped with this amortisseur
CN102967533A (en) * 2012-09-12 2013-03-13 中北大学 High pressure seal test device for measuring daub cushioning performance
CN103016600A (en) * 2012-12-26 2013-04-03 东南大学 Viscoelastic ball shock absorber
CN103016600B (en) * 2012-12-26 2015-09-16 东南大学 Viscoelastic ball shock absorber
CN103062273B (en) * 2013-01-21 2015-04-22 陕西理工学院 Damping-adjustable elastic clay buffer for vehicle
CN103062273A (en) * 2013-01-21 2013-04-24 陕西理工学院 Damping-adjustable elastic clay buffer for vehicle
CN103539016A (en) * 2013-11-12 2014-01-29 湖州洋西起重设备有限公司 Elastic buffer of festoon cable
CN104653690A (en) * 2013-11-20 2015-05-27 哈恩气动弹簧有限责任公司 Spring element
CN104653690B (en) * 2013-11-20 2019-06-18 哈恩气动弹簧有限责任公司 Spring element
CN103883665A (en) * 2014-04-15 2014-06-25 叶晓锋 Instantaneous speed reducer
CN106678242A (en) * 2017-01-17 2017-05-17 扬州市大洋水务设备有限公司 Pneumatic buffer
CN108679148A (en) * 2018-05-25 2018-10-19 中国人民解放军陆军装甲兵学院 Colloidal damper
CN110901681A (en) * 2019-12-03 2020-03-24 北京强度环境研究所 Elastic cement buffer for metro vehicle
CN110901681B (en) * 2019-12-03 2021-01-05 北京强度环境研究所 Elastic cement buffer for metro vehicle
CN110733528A (en) * 2019-12-04 2020-01-31 北京强度环境研究所 Elastic daub buffering device for motor train unit
CN110733528B (en) * 2019-12-04 2021-01-05 北京强度环境研究所 Elastic daub buffering device for motor train unit

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Granted publication date: 20081015