CN204878500U - Hydraulic absorber of multistage damping throttle - Google Patents
Hydraulic absorber of multistage damping throttle Download PDFInfo
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- CN204878500U CN204878500U CN201520609240.1U CN201520609240U CN204878500U CN 204878500 U CN204878500 U CN 204878500U CN 201520609240 U CN201520609240 U CN 201520609240U CN 204878500 U CN204878500 U CN 204878500U
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Abstract
The utility model provides a hydraulic absorber of multistage damping throttle, hydraulic absorber of multistage damping throttle includes: pneumatic cylinder (1), front end housing (2), rear end cap (3), piston assembly (4) and throttle lever (5). The advantage does: inside all cavitys of this buffer are packed by hydraulic oil and compressed air, are clashed into and atress when moving down when the piston rod, provide the damping force through multistage damping throttle, relax the downward translation rate of piston rod, and at the stroke within range, produced damping force contends with with external force, clash into produced energy up to complete absorption, and the nothing rebounds, and after external force was withdrawwed, hydraulic absorber can rely on compressed air automatic re -setting, did not need additionally to install the spring to hydraulic absorber overall cost has been practiced thrift.
Description
Technical field
The utility model belongs to hydraulic cushion technical field, is specifically related to a kind of hydraulic bjuffer of Multi-stage damping throttling.
Background technique
Hydraulic bjuffer is a kind of safety protection damping device; be widely used in the machinery such as engineering vehicle, elevator, metallurgy, harbour machinery, rail truck; its effect is: instantly during junk high-speed mobile (being equivalent to free falling body state); very large inertial force can be caused; and the impact that under hydraulic bjuffer Absorbable rod, junk brings, prevent hard collision from causing mechanism to damage.
Such as, in engineering machinery, especially rotary drilling rig, often can run into the problem that this hard collision causes mechanism to damage.Concrete; the main execution architecture of rotary drilling rig principal arm is multi-stage oil cylinder; when rotary digging drill power head declines time, multi-stage oil cylinder can perform an action, but outside protection multi-stage oil cylinder there is adhesion in expansion device, the phenomenon such as get stuck possibly; along with multi-stage oil cylinder hydraulic coupling constantly increases; expansion device can fall suddenly, is equivalent to free falling body state the same, pounds on the connecting plate of unit head; thus cause unit head to damage, cause great economic loss.Therefore, be the situation avoiding hard collision to cause mechanism to damage, need to arrange hydraulic bjuffer on the connecting plate of unit head.
But, existing hydraulic bjuffer commercially, consumed energy is directly proportional to hydraulic bjuffer volume, can not only meet hydraulic bjuffer volume little, but also the large user demand of consumed energy can be met.
Model utility content
For the defect that prior art exists, the utility model provides a kind of hydraulic bjuffer of Multi-stage damping throttling, can effectively solve the problem.
The technical solution adopted in the utility model is as follows:
The utility model provides a kind of hydraulic bjuffer of Multi-stage damping throttling, comprising: oil hydraulic cylinder (1), front cover (2), rear end cover (3), piston assembly (4) and throttling rod (5);
Wherein, described oil hydraulic cylinder (1) is vertically arranged, in the forward end seal of described oil hydraulic cylinder (1), described front cover (2) is set, arrange described rear end cover (3) at the back-end sealing of described oil hydraulic cylinder (1), described front cover (2) and described rear end cover (3) make the internal cavity of described oil hydraulic cylinder (1) form enclosed space;
Offer the 1st mounting hole in the central position of described front cover (2), the central position of end cap (3) offers the 2nd mounting hole in the rear, and the diameter of described 1st mounting hole is greater than the diameter of described 2nd mounting hole;
Described piston assembly (4) comprising: piston cap (41) and piston rod (42);
Described piston cap (41) is horizontally set at the inside cavity of described oil hydraulic cylinder (1), the periphery wall of described piston cap (41) seals with the cavity inner wall of described oil hydraulic cylinder (1) and is slidably connected, by described piston cap (41), the cavity of described oil hydraulic cylinder (1) is divided into upper cavity (11) and lower chamber (12); In addition, at least one one-way valve (43) is offered in described piston cap (41), the entrance of described one-way valve (43) is communicated with described upper cavity (11), and the outlet of described one-way valve (43) is communicated with described lower chamber (12);
Described piston rod (42) is tubular structure, comprises cylindrical shell, described cylindrical shell open at one end, and the other end seals; The external diameter of described cylindrical shell and the internal diameter of described 1st mounting hole suitable, then: described cylindrical shell is down uncovered, the 1st mounting hole described in hermetically passing and make the open-mouth end of described cylindrical shell be sealingly clamped to the upper surface of described piston cap (41); By arranging described cylindrical shell, the cavity of described inner barrel is called inner chamber body (14), the ring-shaped cavity that the inwall of the outer wall of described cylindrical shell and described oil hydraulic cylinder (1) is formed is called outer chamber (15); Outer chamber (15) is part upper cavity (11); Then: offer at least one oil overflow hole (6) in the bottom of described cylindrical shell, described inner chamber body (14) and described outer chamber (15) is made to form connectivity structure;
In addition, the 3rd mounting hole is offered in the central position of described piston cap (41); Described throttling rod (5) presses direction from bottom to top, successively through after described 2nd mounting hole and described 3rd mounting hole, make the front-end face of described throttling rod (5) be arranged in described inner chamber body (14), make the ear end face of described throttling rod (5) be positioned at the outside of described rear end cover (3); Further, described throttling rod (5) and the 2nd mounting hole of described rear end cover (3) are seal and fixing Placement, and described throttling rod (5) is fixedly installed by described rear end cover (3); Described throttling rod (5) is that gap is arranged with the 3rd mounting hole of described piston cap (41), has multiple damping gap between the outer wall of described throttling rod (5) and the hole wall of described 3rd mounting hole;
In addition, the central shaft of described throttling rod (5) is to being provided with defeated medium channel (51); The rearward end of described throttling rod is provided with defeated medium valve (52), by handling defeated medium valve (52), external agency is transported to described inner chamber body (14) by described defeated medium channel (51).
Preferably, described front cover (2) is flexibly connected with the inwall of described oil hydraulic cylinder (1); Described rear end cover (3) is fixedly connected with the inwall of described oil hydraulic cylinder (1).
Preferably, described rear end cover (3) is threaded connection with the inwall of described oil hydraulic cylinder (1).
Preferably, also comprise escape way (7), described escape way (7) successively through described rear end cover (3) and described throttling rod (5), and then is communicated with described lower chamber (12) and described defeated medium channel (51); At described escape way (7), safety valve (8) is installed.
The hydraulic bjuffer of the Multi-stage damping throttling that the utility model provides has the following advantages:
There is the advantage that volume is little, consumed energy large, reliable operation, good buffer effect, structure are simple, cost is low, can extensively promote the use of.
Accompanying drawing explanation
The hydraulic bjuffer that Fig. 1 provides for the utility model at upright and piston rod movement to cross-sectional view during minimum point state;
The hydraulic bjuffer that Fig. 2 provides for the utility model at upright and piston rod movement to cross-sectional view during peak state;
The hydraulic bjuffer that Fig. 3 provides for the utility model in inversion and piston rod movement to cross-sectional view during minimum point state.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail:
The utility model provides a kind of hydraulic bjuffer of Multi-stage damping throttling, the inner all cavitys of this buffer by hydraulic oil and pressurized air fill, when piston rod be knocked and stressed move down time, damping force is provided by Multi-stage damping throttling, relax piston rod and move down speed, in stroke range, the damping force produced and external force contend with, until absorb the energy clashing into and produce completely, without bounce-back; And after external force is cancelled, hydraulic bjuffer can rely on pressurized air to automatically reset, do not need extra mounting spring, thus save hydraulic bjuffer holistic cost.
Concrete, as shown in Figure 1-2, the utility model provides a kind of hydraulic bjuffer of Multi-stage damping throttling, comprising: oil hydraulic cylinder 1, front cover 2, rear end cover 3, piston assembly 4 and throttling rod 5;
Wherein, oil hydraulic cylinder 1 is vertically arranged, and arranges front cover 2 in the forward end seal of oil hydraulic cylinder 1, arranges rear end cover 3 at the back-end sealing of oil hydraulic cylinder 1, and rear end cover is connected by the inwall of thread connecting mode with oil hydraulic cylinder 1; Front cover 2 and rear end cover 3 make the internal cavity of oil hydraulic cylinder 1 form enclosed space; Herein, as the utility model one innovation, front cover 2 is flexibly connected with the inwall of oil hydraulic cylinder 1, do not need any link is installed between front cover 2 and the inwall of oil hydraulic cylinder 1, only rely on inside cavity pressurized air, in buffer using process, firmly front cover 2 can be stabilized in the front end of oil hydraulic cylinder 1 all the time.Concrete reason sees below analysis.
Offer the 1st mounting hole in the central position of front cover 2, offer the 2nd mounting hole in the central position of rear end cover 3, and the diameter of the 1st mounting hole is greater than the diameter of the 2nd mounting hole;
Piston assembly 4 comprises: piston cap 41 and piston rod 42;
Piston cap 41 is horizontally set at the inside cavity of oil hydraulic cylinder 1, and the periphery wall of piston cap 41 seals with the cavity inner wall of oil hydraulic cylinder 1 and is slidably connected, that is: piston cap 41 can move up and down along the cavity inner wall of oil hydraulic cylinder 1; By piston cap 41, the cavity of oil hydraulic cylinder 1 is divided into upper cavity 11 and lower chamber 12; In addition, offer at least one one-way valve 43 in piston cap 41, the entrance of one-way valve 43 is communicated with upper cavity 11, and the outlet of one-way valve 43 is communicated with lower chamber 12; The meaning that arranges of one-way valve is herein: the MEDIA FLOW of upper cavity 11 can only be made to lower chamber 12; When both having made pressure higher than upper cavity 11 of pressure when lower chamber 12, the medium of lower chamber 12 also cannot flow to upper cavity 11 by one-way valve 43.
Piston rod 42 is tubular structure, comprises cylindrical shell, cylindrical shell open at one end, and the other end seals; The external diameter of cylindrical shell and the internal diameter of the 1st mounting hole suitable, then: cylindrical shell is down uncovered, hermetically passing the 1st mounting hole and make the open-mouth end of cylindrical shell be sealingly clamped to the upper surface of piston cap 41; By arranging cylindrical shell, the cavity of inner barrel is called inner chamber body 14, the ring-shaped cavity that the inwall of the outer wall of cylindrical shell and oil hydraulic cylinder 1 is formed is called outer chamber 15; Offer at least one oil overflow hole 6 in the bottom of cylindrical shell, make inner chamber body 14 and outer chamber 15 form connectivity structure;
Herein, the concrete meaning distinguishing the utility model four cavitys be noted:
Upper cavity 11 and lower chamber 12 are the internal cavity of oil hydraulic cylinder 1, oil hydraulic cylinder 1 cavity be positioned at above piston cap 41 is called upper cavity 11, and oil hydraulic cylinder 1 cavity be positioned at below piston cap 41 is called lower chamber 12, therefore, when piston cap 41 moves up and down along oil hydraulic cylinder 1, the cavity volume of upper cavity 11 and lower chamber 12 can change.
And inner chamber body 14 refers to the cavity of piston rod inner barrel, no matter piston cap 41 moves to any position along oil hydraulic cylinder 1, and the cavity volume of inner chamber body 14 is definite values, can not change;
Outer chamber 15 refers to the ring-shaped cavity that the outer wall of piston rod cylindrical shell and the inwall of oil hydraulic cylinder 1 are formed, and when piston rod movement is to lowest point, when being state shown in Fig. 1, the cavity volume of outer chamber 15 reaches maximum value; And when piston rod movement is to peak position, when being state shown in Fig. 2, the cavity volume of outer chamber 15 reaches minimum value;
But can find, no matter piston rod movement is to any position, total cavity of outer chamber and inner chamber body is inevitable in fact contains upper cavity, and that is, total cavity volume of outer chamber and inner chamber body is greater than upper cavity cavity volume.Therefore, the volume of the inner all cavitys of hydraulic bjuffer in fact only need be divided into three parts, is respectively: lower chamber, inner chamber body and outer chamber.When understanding the utility model principle, the concept of upper cavity can be ignored.
In the utility model, although outer chamber 15 and inner chamber body 14 are connectivity structure, but still differentiation outer chamber 15 with the meaning of inner chamber body 14 is: outer chamber 15 is different with the effect of inner chamber body 14; Outer chamber 15 directly communicates with front cover, and the pressurized air of outer chamber 15 ensures that front cover is stabilized in the direct driving force source of cylinder barrel front end; And the pressurized air in inner chamber body is after external force is cancelled, make piston rod move up reset directly move as source, therefore, for convenience of describe, the utility model has distinguished outer chamber 15 and inner chamber body 14.
In addition, the 3rd mounting hole is offered in the central position of piston cap 41; Throttling rod 5 presses direction from bottom to top, successively through after the 2nd mounting hole and the 3rd mounting hole, makes the front-end face of throttling rod 5 be arranged in inner chamber body 14, makes the ear end face of throttling rod 5 be positioned at the outside of rear end cover 3; Further, throttling rod 5 and the 2nd mounting hole of rear end cover 3 are seal and fixing Placement, and throttling rod 5 is fixedly installed by rear end cover 3, and that is, when piston rod moves up and down, throttling rod remains and maintains static; Throttling rod 5 is that gap is arranged with the 3rd mounting hole of piston cap 41, has multiple damping gap between the outer wall of throttling rod 5 and the hole wall of the 3rd mounting hole;
In addition, the central shaft of throttling rod 5 is to being provided with defeated medium channel 51; The rearward end of throttling rod is provided with defeated medium valve 52, by handling defeated medium valve 52, external agency is transported to inner chamber body 14 by defeated medium channel 51.Medium is herein the general designation of pressurized air and hydraulic oil.
Also comprise escape way 7, escape way 7 successively through rear end cover 3 and throttling rod 5, and then is communicated with lower chamber 12 and defeated medium channel 51; At escape way 7, safety valve 8 is installed.Safety valve is for when cavity internal pressure is excessive instantly, and the pressure of release lower chamber, reaches the effect of protection hydraulic bjuffer.
Based on aforesaid hydraulic bjuffer, the utility model also provides a kind of hydraulic cushion method of Multi-stage damping throttling, comprises the following steps:
Step 1, after assembling obtains the hydraulic bjuffer of Multi-stage damping throttling, be inverted by hydraulic bjuffer, form state shown in Fig. 3, make front cover 2 be positioned at lower position, rear end cover 3 is positioned at upper position; Then, open defeated medium valve 52, be full of hydraulic oil by defeated medium valve 52 to the cavity of hydraulic bjuffer; That is: inner chamber body 14, outer chamber 15 and lower chamber 12 are all full of hydraulic oil;
Running of hydraulic power oil mode is: first, and hydraulic oil flow into inner chamber body 14 by defeated medium channel 51, then, flow into outer chamber 15 by oil overflow hole 6, then flow into lower chamber 12 by one-way valve 43;
Further, when injection liquid force feed, due to the gravitational force urges effect of hydraulic oil, promote piston cap 41 and move towards front cover 2, and finally move to the position contacted with front cover 2; And when piston cap 41 is towards in the process of front cover 2 movement, promote the inside cavity gradually outwards movement of piston rod 42 from oil hydraulic cylinder 1 simultaneously; Further, when the sealed end of piston rod 42 moves to outermost position, the oil overflow hole 6 that piston rod 42 is installed is still in the inside cavity of oil hydraulic cylinder 1; Inner chamber body 14 is communicated with outer chamber 15 by oil overflow hole 6;
Step 2, after inner chamber body 14, outer chamber 15 and lower chamber 12 are all full of hydraulic oil, are the upright state that arranges by hydraulic bjuffer upset, obtain state shown in Fig. 2; Then open defeated medium valve 52, under gravity, the hydraulic oil being positioned at all cavitys above throttling rod 5 top end all flows to buffer outside by defeated medium channel 51;
Then, by defeated medium channel 51, to being positioned at all cavity input compressed-airs above throttling rod 5 top end, then close defeated medium valve 52;
Now, with throttling rod 5 top end for separating surface, all cavitys be positioned at above throttling rod 5 top end fill up pressurized air; And all cavitys be positioned at below throttling rod 5 top end fill up hydraulic oil; Further, the peak due to piston rod 42 movement travel can not exceed throttling rod 5 top end, and therefore, lower chamber 12 must fill up hydraulic oil; And because the sealed end of piston rod 42 is higher than the top of oil hydraulic cylinder 1, therefore, the sealed end of piston rod 42 is inevitable higher than throttling rod 5 top end, so the inner chamber body of piston rod 42 must be filled with pressurized air;
Step 3, when piston rod 42 moves down by external force, namely by Fig. 2 state to Fig. 1 state-transition time, owing to there is multiple damping gap between the 3rd mounting hole hole wall of piston rod 42 and the outer wall of throttling rod 5, therefore, first the hydraulic oil of lower chamber 12 flow into inner chamber body 14 by damping gap, when the hydraulic oil being injected into inner chamber body 14 reach a certain amount of after, outer chamber 15 can be flow into by oil overflow hole 6; Therefore, when the hydraulic oil of lower chamber 12 is upwards flowed by damping gap, form the damping force contrary with piston rod 42 movement direction, and this damping force directly acts on piston rod 42, reach the impact force when piston rod 42 that contends with moves down, play buffer function, until make piston rod 42 stop moving down;
Step 4, after the external force putting on piston rod 42 is cancelled, because the inner chamber body of piston rod 42 is filled with pressurized air, therefore, under compressed-air actuated effect, piston rod 42 moves up reset, further, in the process that piston rod 42 moves up, drive piston cap 41 to move up simultaneously; And when piston cap 41 moves up, the hydraulic oil being positioned at cavity above piston cap 41 flow back into lower chamber 12 by one-way valve 43.
In addition; when the overpressure of lower chamber 12, open the safety-valve 8, the hydraulic oil of lower chamber 12 flow into defeated medium channel 51 by escape way 7; flow into inner chamber body 14 by defeated medium channel 51 again, reach protection buffer, improve the effect of buffer use safety.
As can be seen here, the hydraulic bjuffer of Multi-stage damping throttling that provides of the utility model and hydraulic cushion method have the following advantages:
There is the advantage that volume is little, consumed energy large, reliable operation, good buffer effect, structure are simple, cost is low, can extensively promote the use of.
The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should look protection domain of the present utility model.
Claims (4)
1. a hydraulic bjuffer for Multi-stage damping throttling, is characterized in that, comprising: oil hydraulic cylinder (1), front cover (2), rear end cover (3), piston assembly (4) and throttling rod (5);
Wherein, described oil hydraulic cylinder (1) is vertically arranged, in the forward end seal of described oil hydraulic cylinder (1), described front cover (2) is set, arrange described rear end cover (3) at the back-end sealing of described oil hydraulic cylinder (1), described front cover (2) and described rear end cover (3) make the internal cavity of described oil hydraulic cylinder (1) form enclosed space;
Offer the 1st mounting hole in the central position of described front cover (2), the central position of end cap (3) offers the 2nd mounting hole in the rear, and the diameter of described 1st mounting hole is greater than the diameter of described 2nd mounting hole;
Described piston assembly (4) comprising: piston cap (41) and piston rod (42);
Described piston cap (41) is horizontally set at the inside cavity of described oil hydraulic cylinder (1), the periphery wall of described piston cap (41) seals with the cavity inner wall of described oil hydraulic cylinder (1) and is slidably connected, by described piston cap (41), the cavity of described oil hydraulic cylinder (1) is divided into upper cavity (11) and lower chamber (12); In addition, at least one one-way valve (43) is offered in described piston cap (41), the entrance of described one-way valve (43) is communicated with described upper cavity (11), and the outlet of described one-way valve (43) is communicated with described lower chamber (12);
Described piston rod (42) is tubular structure, comprises cylindrical shell, described cylindrical shell open at one end, and the other end seals; The external diameter of described cylindrical shell and the internal diameter of described 1st mounting hole suitable, then: described cylindrical shell is down uncovered, the 1st mounting hole described in hermetically passing and make the open-mouth end of described cylindrical shell be sealingly clamped to the upper surface of described piston cap (41); By arranging described cylindrical shell, the cavity of described inner barrel is called inner chamber body (14), the ring-shaped cavity that the inwall of the outer wall of described cylindrical shell and described oil hydraulic cylinder (1) is formed is called outer chamber (15); Outer chamber (15) is part upper cavity (11); Then: offer at least one oil overflow hole (6) in the bottom of described cylindrical shell, described inner chamber body (14) and described outer chamber (15) is made to form connectivity structure;
In addition, the 3rd mounting hole is offered in the central position of described piston cap (41); Described throttling rod (5) presses direction from bottom to top, successively through after described 2nd mounting hole and described 3rd mounting hole, make the front-end face of described throttling rod (5) be arranged in described inner chamber body (14), make the ear end face of described throttling rod (5) be positioned at the outside of described rear end cover (3); Further, described throttling rod (5) and the 2nd mounting hole of described rear end cover (3) are seal and fixing Placement, and described throttling rod (5) is fixedly installed by described rear end cover (3); Described throttling rod (5) is that gap is arranged with the 3rd mounting hole of described piston cap (41), has multiple damping gap between the outer wall of described throttling rod (5) and the hole wall of described 3rd mounting hole;
In addition, the central shaft of described throttling rod (5) is to being provided with defeated medium channel (51); The rearward end of described throttling rod is provided with defeated medium valve (52), by handling defeated medium valve (52), external agency is transported to described inner chamber body (14) by described defeated medium channel (51).
2. the hydraulic bjuffer of Multi-stage damping throttling according to claim 1, is characterized in that, described front cover (2) is flexibly connected with the inwall of described oil hydraulic cylinder (1); Described rear end cover (3) is fixedly connected with the inwall of described oil hydraulic cylinder (1).
3. the hydraulic bjuffer of Multi-stage damping throttling according to claim 2, is characterized in that, described rear end cover (3) is threaded connection with the inwall of described oil hydraulic cylinder (1).
4. the hydraulic bjuffer of Multi-stage damping throttling according to claim 1, it is characterized in that, also comprise escape way (7), described escape way (7) successively through described rear end cover (3) and described throttling rod (5), and then is communicated with described lower chamber (12) and described defeated medium channel (51); At described escape way (7), safety valve (8) is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520609240.1U CN204878500U (en) | 2015-08-13 | 2015-08-13 | Hydraulic absorber of multistage damping throttle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520609240.1U CN204878500U (en) | 2015-08-13 | 2015-08-13 | Hydraulic absorber of multistage damping throttle |
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| Publication Number | Publication Date |
|---|---|
| CN204878500U true CN204878500U (en) | 2015-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520609240.1U Active CN204878500U (en) | 2015-08-13 | 2015-08-13 | Hydraulic absorber of multistage damping throttle |
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| CN (1) | CN204878500U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673761A (en) * | 2015-08-13 | 2016-06-15 | 北京鸣天流体技术有限责任公司 | Hydraulic buffer with multi-stage damping throttles and hydraulic buffering method |
| CN109083968A (en) * | 2018-10-30 | 2018-12-25 | 江苏容大减震科技股份有限公司 | A kind of high speed and large stroke damper of suitable blasting impact environment |
| CN111572587A (en) * | 2020-06-15 | 2020-08-25 | 中车青岛四方车辆研究所有限公司 | Buffering energy-absorbing device |
| CN116985991A (en) * | 2023-09-25 | 2023-11-03 | 中国飞机强度研究所 | Oil-hole-variable aircraft landing gear buffer and buffering method thereof |
-
2015
- 2015-08-13 CN CN201520609240.1U patent/CN204878500U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673761A (en) * | 2015-08-13 | 2016-06-15 | 北京鸣天流体技术有限责任公司 | Hydraulic buffer with multi-stage damping throttles and hydraulic buffering method |
| CN109083968A (en) * | 2018-10-30 | 2018-12-25 | 江苏容大减震科技股份有限公司 | A kind of high speed and large stroke damper of suitable blasting impact environment |
| CN111572587A (en) * | 2020-06-15 | 2020-08-25 | 中车青岛四方车辆研究所有限公司 | Buffering energy-absorbing device |
| CN116985991A (en) * | 2023-09-25 | 2023-11-03 | 中国飞机强度研究所 | Oil-hole-variable aircraft landing gear buffer and buffering method thereof |
| CN116985991B (en) * | 2023-09-25 | 2023-12-15 | 中国飞机强度研究所 | Oil-hole-variable aircraft landing gear buffer and buffering method thereof |
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| C14 | Grant of patent or utility model | ||
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Effective date of registration: 20210104 Address after: 074004 A17 / F, Hegu Intelligent Technology Town, north of Chengxin Road, east of Xinglong Street, Gaobeidian City, Baoding City, Hebei Province Patentee after: Hebei Mingtian Fluid Technology Co.,Ltd. Address before: 1-627, 6th floor, 225 Jiazhou Shuijun, Changyang Town, Fangshan District, Beijing Patentee before: BEIJING MINGTIAN FLUID TECHNOLOGY Co.,Ltd. |
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| TR01 | Transfer of patent right |