CN109595282B - Rotary type pressure-torsion combined elastic damping device - Google Patents
Rotary type pressure-torsion combined elastic damping device Download PDFInfo
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- CN109595282B CN109595282B CN201811595749.XA CN201811595749A CN109595282B CN 109595282 B CN109595282 B CN 109595282B CN 201811595749 A CN201811595749 A CN 201811595749A CN 109595282 B CN109595282 B CN 109595282B
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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
- F16F7/02—Vibration-dampers; Shock-absorbers with relatively-rotatable friction surfaces that are pressed together
- F16F7/06—Vibration-dampers; Shock-absorbers with relatively-rotatable friction surfaces that are pressed together in a direction perpendicular or inclined to the axis of rotation
Abstract
The invention discloses a rotary type pressure-torsion combined elastic damping device, which comprises at least one spiral spring, wherein a plurality of spiral springs are concentrically arranged, and a torque plate and a bottom plate are respectively arranged above and below the spiral springs; a torsion mechanism is hinged between the torque plate and the bottom plate, and relative rotation and relative vertical displacement motion can be generated between the torque plate and the bottom plate; a guide rod is arranged on the plane of the bottom plate facing the torque plate, and a guide boss is arranged at the outer edge of the guide rod; a sleeve is arranged on the plane of the top plate facing the bottom plate, and a guide groove is formed in the inner wall of the sleeve; the guide groove is engaged with the guide boss, and only relative vertical movement can be generated between the guide groove and the guide boss; the top plate and the torque plate are provided with an upper friction plate and a lower friction plate in a face-to-face manner. According to the invention, external vertical vibration can be converted into vertical and axial rotation movement inside the structure through the designed torsion mechanism, so that the cooperative damping of various energy dissipation elements is realized, and the energy absorption and damping efficiency of the device is improved.
Description
Technical Field
The invention relates to an energy-absorbing and shock-absorbing device suitable for carrying equipment and an ultra-large machine tool, in particular to a rotary type pressure-torsion combined elastic shock-absorbing device.
Background
With the rapid development of science and technology, the research and development of energy-absorbing and shock-absorbing devices are more and more deep, and the application range is further popularized, wherein various types of carrying equipment and large machine tools use a large number of energy-absorbing shock absorbers for ensuring the operation safety and stability. Taking a high-speed train set as an example, electrical equipment of the high-speed train set is often in a vibration environment, and a shock absorber needs to be arranged at the lower part of the electrical equipment to avoid potential safety hazards. In recent years, the technology of traffic carrying equipment is rapidly developed, and the problems of shock absorption and noise reduction of various types of carrying equipment in complex and severe environments become new challenges. Similarly, in the application process of some large or ultra-large machine tool equipment, the requirements of shock absorption and noise reduction are inevitably considered, and an energy absorption and shock absorption device with small volume and good performance is also required. The traditional spring or rubber damping element is adopted in the existing damping technology, and the higher and higher damping requirements cannot be met.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an efficient rotary type pressure-torsion combined elastic damping device, which can convert external vertical vibration into vertical and axial rotary motion in a structure by utilizing a torsion mechanism in the structure, realize the cooperative damping of various energy dissipation elements and improve the energy absorption and damping efficiency of the device.
The purpose of the invention is realized by the following technical scheme:
the device comprises a helical spring;
the number of the spiral springs is at least one, the outer diameters of the spiral springs are different and are concentrically arranged, and a torque plate and a bottom plate are respectively arranged above and below the spiral springs; a torsion mechanism is hinged between the torque plate and the bottom plate; the torsion mechanism is obliquely arranged and enables relative rotation and relative vertical displacement motion to be generated between the torque plate and the bottom plate; a top plate is arranged above the torque plate;
a guide rod is arranged on the plane of the bottom plate facing the torque plate, and a guide boss is arranged at the outer edge of the guide rod;
a sleeve is arranged on the plane of the top plate facing the bottom plate, and a guide groove is formed in the inner wall of the sleeve;
the guide groove is meshed with the guide boss, and only relative vertical movement can be generated between the guide groove and the guide boss;
the plane of the top plate facing the torque plate is provided with an upper friction plate and is rigidly connected with the friction plate;
and a lower friction plate is arranged on the plane of the torque plate facing the top plate and is rigidly connected with the torque plate.
The torsion mechanism comprises a limit pin shaft and a rocker, and the limit pin shaft penetrates through the top plate, the upper friction plate, the lower friction plate, the torque plate and the bottom plate and is fixed by a washer and a cotter pin; in the initial state, the acute angle between the rocker and the bottom plate is less than 75 degrees.
The torsion mechanism comprises a rocker and a steel wire rope, the rocker and the steel wire rope are arranged between the base plate and the torque plate in a triangular mode in an initial state, and an acute angle between the rocker and the base plate is smaller than 75 degrees.
The torsion mechanism comprises a rocker and a sleeve guide rod, the rocker and the sleeve guide rod are arranged between the bottom plate and the torque plate in a triangular mode in an initial state, and an acute angle between the rocker and the bottom plate is smaller than 75 degrees; the outside or inside of the sleeve guide can also be provided with a helical spring.
The torsion mechanism comprises a rocker and a damper with a telescopic structure, the rocker and the damper with the telescopic structure are arranged between the base plate and the torque plate in a triangular mode in an initial state, and an acute angle between the rocker and the base plate is smaller than 75 degrees.
The torsion mechanism comprises a rocker and a rigidity-adjustable shock absorber of a telescopic structure, the rocker and the rigidity-adjustable shock absorber of the telescopic structure are arranged in a triangular mode between the base plate and the torque plate in an initial state, and an acute angle between the rocker and the base plate is smaller than 75 degrees.
And the torque plate and the bottom plate are provided with spring clamping seats.
A spiral spring is arranged between the sleeve of the top plate and the guide rod or between the sleeve and the bottom plate, and a certain distance is reserved between the upper friction plate and the lower friction plate in an initial state; and end fixing devices of a spiral spring are arranged on the torque plate and the bottom plate.
Compared with the prior art, the invention can convert external vertical vibration into vertical and axial rotation motion in the structure by utilizing the torsion mechanism in the structure, realize the cooperative damping of the spring and other energy dissipation elements and improve the energy absorption and damping efficiency of the device.
Drawings
Fig. 1 is a schematic structural diagram according to an embodiment of the present invention.
FIG. 2 is a schematic sectional view A-A of FIG. 1.
The spring clamp is omitted.
In the figure: 1-top plate, 2-upper friction plate, 3-lower friction plate, 4-sleeve, 5-guide groove, 6-limit pin shaft, 7-washer, 8-split pin, 9-torque plate, 10-spring clamping seat, 11-spiral spring, 12-torsion mechanism, 13-bottom plate, 14-guide rod, 15-guide boss and 16-rocker.
Detailed Description
The invention is further illustrated by way of example in the following with reference to the accompanying drawings:
referring to figures 1, 2:
the device comprises a helical spring 11;
the number of the spiral springs 11 is at least one, the outer diameters of the spiral springs 11 are different, but the spiral springs are concentrically arranged, and a torque plate 9 and a bottom plate 13 are respectively arranged above and below the spiral springs 11; a torsion mechanism 12 is hinged between the torque plate 9 and the bottom plate 13; the torsion mechanism 12 is obliquely arranged and enables relative rotation and relative vertical displacement motion between the torque plate 9 and the bottom plate 13; a top plate 1 is arranged above the torque plate 9;
a guide rod 14 is arranged on the plane of the bottom plate 13 facing the torque plate 9, and a guide boss 15 is arranged at the outer edge of the guide rod 14;
a sleeve 4 is arranged on the plane of the top plate 1 facing the bottom plate 13, and a guide groove 5 is arranged on the inner wall of the sleeve 4;
the guide groove 5 is engaged with the guide boss 15, and only relative vertical movement can be generated between the guide groove and the guide boss;
the plane of the top plate 1 facing the torque plate 9 is provided with an upper friction plate 2 and is rigidly connected with the upper friction plate;
the torque plate 9 is provided with a lower friction plate 3 on the plane facing the top plate 1 and is rigidly connected.
The torsion mechanism 12 comprises a limit pin shaft 6 and a rocker 16, and the limit pin shaft 6 penetrates through the top plate 1, the upper friction plate 2, the lower friction plate 3, the torque plate 9 and the bottom plate 13 and is fixed by a washer 7 and a cotter pin 8; in the initial state, the acute angle between the rocker 16 and the base plate 13 is less than 75 degrees.
The torsion mechanism 12 comprises a rocker 16 and a wire rope, and in an initial state, the rocker 16 and the wire rope are arranged in a triangular shape between the base plate 13 and the torque plate 9, and an acute angle between the rocker 16 and the base plate 13 is smaller than 75 degrees.
The torsion mechanism 12 comprises a rocker 16 and a sleeve guide rod, and in an initial state, the rocker 16 and the sleeve guide rod are arranged between the bottom plate 13 and the torque plate 9 in a triangular mode, and an acute angle between the rocker 16 and the bottom plate 13 is smaller than 75 degrees; the outside or inside of the sleeve guide can also be provided with a helical spring.
The torsion mechanism 12 comprises a rocker 16 and a damper in a telescopic structure, wherein in an initial state, the rocker 16 and the damper in the telescopic structure are arranged between the base plate 13 and the torque plate 9 in a triangular mode, and an acute angle between the rocker 16 and the base plate 13 is smaller than 75 degrees.
The torsion mechanism 12 comprises a rocker 16 and a telescopic stiffness adjustable damper, and in an initial state, the rocker 16 and the telescopic stiffness adjustable damper are arranged in a triangular shape between the base plate 13 and the torque plate 9, and an acute angle between the rocker 16 and the base plate 13 is smaller than 75 degrees.
And spring clamping seats 10 are arranged on the torque plate 9 and the bottom plate 13.
A spiral spring is arranged between the sleeve 4 of the top plate 1 and the guide rod 14 or between the sleeve 4 and the bottom plate 13, and a certain distance is reserved between the upper friction plate 2 and the lower friction plate 3 in an initial state; the torque plate 9 and the bottom plate 13 are provided with end fixing means of a coil spring 11.
Example 1:
the device comprises a helical spring 11;
the number of the spiral springs 11 is at least one, the outer diameters of the spiral springs 11 are different, but the spiral springs are concentrically arranged, and a torque plate 9 and a bottom plate 13 are respectively arranged above and below the spiral springs 11; a torsion mechanism 12 is hinged between the torque plate 9 and the bottom plate 13; the torsion mechanism 12 is obliquely arranged and enables relative rotation and relative vertical displacement motion between the torque plate 9 and the bottom plate 13; a top plate 1 is arranged above the torque plate 9;
a guide rod 14 is arranged on the plane of the bottom plate 13 facing the torque plate 9, and a guide boss 15 is arranged at the outer edge of the guide rod 14;
a sleeve 4 is arranged on the plane of the top plate 1 facing the bottom plate 13, and a guide groove 5 is arranged on the inner wall of the sleeve 4;
the guide groove 5 is engaged with the guide boss 15, and only relative vertical movement can be generated between the guide groove and the guide boss;
the plane of the top plate 1 facing the torque plate 9 is provided with an upper friction plate 2 and is rigidly connected with the upper friction plate;
the torque plate 9 is provided with a lower friction plate 3 on the plane facing the top plate 1 and is rigidly connected.
In the present embodiment, the device can achieve compression energy absorption of the coil spring 11 and friction energy absorption and shock absorption of the friction plate.
Example 2:
essentially the same as in example 1, except that: the torsion mechanism 12 comprises a limit pin shaft 6 and a rocker 16, and the limit pin shaft 6 penetrates through the top plate 1, the upper friction plate 2, the lower friction plate 3, the torque plate 9 and the bottom plate 13 and is fixed by a washer 7 and a cotter pin 8; in the initial state, the acute angle between the rocker 16 and the base plate 13 is less than 75 degrees.
In this embodiment, the device is capable of achieving compression absorption of the coil spring 11 under limited displacement and friction absorption and shock absorption of the friction plate.
Example 3:
essentially the same as in example 1, except that: the torsion mechanism 12 comprises a rocker 16 and a wire rope, and in an initial state, the rocker 16 and the wire rope are arranged in a triangular shape between the base plate 13 and the torque plate 9, and an acute angle between the rocker 16 and the base plate 13 is smaller than 75 degrees.
In this embodiment, the steel wire rope of the device has a limiting effect in an initial state, so that the structure can limit the compression energy absorption of the spiral spring 11 and the friction energy absorption and shock absorption of the friction plate under displacement.
Example 4:
essentially the same as in example 1, except that: the torsion mechanism 12 comprises a rocker 16 and a sleeve guide rod, and in an initial state, the rocker 16 and the sleeve guide rod are arranged between the bottom plate 13 and the torque plate 9 in a triangular mode, and an acute angle between the rocker 16 and the bottom plate 13 is smaller than 75 degrees; the outside or inside of the sleeve guide can also be provided with a helical spring.
In this embodiment, the sleeve guide rod of the device has a limiting effect in an initial state, and can also have a certain energy absorption effect in a working state after being provided with the coil spring, so that the structure can better limit the compression energy absorption of the coil spring 11 and the friction energy absorption and shock absorption of the friction plate under displacement.
Example 5:
essentially the same as in example 1, except that: the torsion mechanism 12 includes a rocker 16 and a damper of telescopic construction, such as an oil damper. In the initial state, the rockers 16 and the dampers of the telescopic structure are arranged in a triangular shape between the base plate 13 and the torque plate 9, and the acute angle of the rockers 16 to the base plate 13 is less than 75 degrees.
In this embodiment, the damper of the device plays a role in limiting in the initial state on one hand, and can also play an auxiliary energy absorption effect in the working state on the other hand, so that the structure can better realize the compression energy absorption of the spiral spring 11, the expansion energy absorption of the oil pressure damper and the friction energy absorption and shock absorption of the friction plate under the displacement limitation.
Example 6:
essentially the same as in example 1, except that: the torsion mechanism 12 includes a rocker 16 and a stiffness-adjustable shock absorber, such as a magnetorheological shock absorber. In the initial state, the rockers 16 and the adjustable-stiffness shock absorber are arranged in a triangular shape between the base plate 13 and the torque plate 9, and the acute angle of the rockers 16 to the base plate 13 is less than 75 degrees. In this embodiment, the damper of the device has a limiting effect in an initial state, and can also perform a function of adaptively adjusting the structural rigidity according to external vibration in a working state, so that the structure can better limit the compression energy absorption of the coil spring 11, the expansion energy absorption of the damper and the friction energy absorption and shock absorption of the friction plate under displacement.
Examples 7 to 12:
essentially the same as in examples 1-6, respectively, except that: and spring clamping seats 10 are arranged on the torque plate 9 and the bottom plate 13. The spring clamping seat 10 can keep the spiral spring 11 at the right position, and can increase the stability and reliability of energy absorption and shock absorption of the device.
Examples 13 to 24:
essentially the same as in examples 1-12, respectively, except that: a spiral spring is arranged between the sleeve 4 of the top plate 1 and the guide rod 14 or between the sleeve 4 and the bottom plate 13, and a certain distance is reserved between the upper friction plate 2 and the lower friction plate 3 in an initial state.
Examples 25 to 48:
essentially the same as in examples 1-24, respectively, except that: a spiral spring is arranged inside the sleeve 4 of the top plate 1 or between the sleeve 4 and the bottom plate 13, so that a certain distance is reserved between the upper friction plate 2 and the lower friction plate 3; the torque plate 9 and the bottom plate 13 are provided with end fixing means of a coil spring 11. The end fixing device adopts a known structure, such as a clamping head, a blocking block and the like. Both end portions of the coil spring 11 are fixed to the torque plate 9 and the base plate 13, respectively, and the coil spring 11 is compressed and twisted at the same time during the operation of the device to increase the energy absorbing and shock absorbing capacity of the device. In the above embodiment, the device can realize a graded damping function, specifically, under a small amplitude vibration load, a gap is formed between the upper friction plate 2 and the lower friction plate 3, and at this time, a coil spring is placed inside the sleeve 4 of the top plate 1 or between the sleeve 4 and the bottom plate 13 to realize primary damping; when the vibration load is large, the upper friction plate 2 and the lower friction plate 3 are attached to trigger the torsion mechanism 12 to play a role, and at the moment, the spiral spring 11, the shock absorber and the friction plates in the device cooperatively play a secondary shock absorption function.
The energy absorption and shock absorption capacity of the invention is embodied as follows:
1. the coil spring 11 absorbs energy and shock when compressed.
2. When the spiral spring 11 is subjected to external force, in the process of stretching and compressing the spiral spring, the torsion mechanism 12 pushes the torque plate 9 to perform back-and-forth rotation, the torque plate 9 and the top plate 1 rotate back and forth relatively, the lower friction plate 3 and the upper friction plate 2 generate friction force, the energy absorption efficiency is improved, and the friction energy absorption effect is gradually enhanced along with the increase of the vibration amplitude.
3. The end fixing device of the spiral spring 11 firmly fixes the two ends of the spiral spring 11, and the spiral spring 11 cannot slide during working, so that the torsion resistance and the rotation resistance of the spiral spring 11 are utilized, and the energy absorption efficiency is improved.
4. The spring clamping seat 10 is used for ensuring the correct position of the spiral spring 11 during working and improving the stability and reliability of energy absorption and shock absorption.
5. The improved torsion mechanism 12 can not only realize the function of rotating the structure around the shaft, but also participate in energy absorption and shock absorption, such as participation of an oil pressure damper and a magneto-rheological damper, so that the structure has a stronger shock-resistant function.
6. According to the invention, a spiral spring is arranged in the sleeve 4 of the top plate 1 or between the sleeve 4 and the bottom plate 13, so that a certain distance is reserved between the upper friction plate 2 and the lower friction plate 3, and the invention has a graded damping function.
Claims (8)
1. A rotary compression-torsion combined type elastic shock-absorbing device, comprising a coil spring (11); the method is characterized in that:
the number of the spiral springs (11) is at least one, the outer diameters of the spiral springs (11) are different, but the spiral springs are concentrically arranged, and a torque plate (9) and a bottom plate (13) are respectively arranged above and below the spiral springs; a torsion mechanism (12) is hinged between the torque plate (9) and the bottom plate (13); the torsion mechanism (12) is obliquely arranged and enables relative rotation and relative vertical displacement between the torque plate (9) and the bottom plate (13); a top plate (1) is arranged above the torque plate (9);
a guide rod (14) is arranged on the plane of the bottom plate (13) facing the torque plate (9), and a guide boss (15) is arranged at the outer edge of the guide rod (14);
a sleeve (4) is arranged on the plane of the top plate (1) facing the bottom plate (13), and a guide groove (5) is arranged on the inner wall of the sleeve (4);
the guide groove (5) is engaged with the guide boss (15), and only relative vertical movement can be generated between the guide groove and the guide boss;
the plane of the top plate (1) facing the torque plate (9) is provided with an upper friction plate (2) and is rigidly connected with the upper friction plate;
the torque plate (9) is provided with a lower friction plate (3) on the plane facing the top plate (1) and is rigidly connected with the lower friction plate.
2. The apparatus of claim 1, wherein: the torsion mechanism (12) comprises a limiting pin shaft (6) and a rocker (16), and the limiting pin shaft (6) penetrates through the top plate (1), the upper friction plate (2), the lower friction plate (3), the torque plate (9) and the bottom plate (13) and is fixed by a gasket (7) and a cotter pin (8); in the initial state, the acute angle between the rocker (16) and the bottom plate (13) is less than 75 degrees.
3. The apparatus of claim 1, wherein: the torsion mechanism (12) comprises a rocker (16) and a steel wire rope, the rocker (16) and the steel wire rope are arranged between the base plate (13) and the torque plate (9) in a triangular mode in an initial state, and an acute angle between the rocker (16) and the base plate (13) is smaller than 75 degrees.
4. The apparatus of claim 1, wherein: the torsion mechanism (12) comprises a rocker (16) and a sleeve guide rod, the rocker (16) and the sleeve guide rod are arranged in a triangular mode between the bottom plate (13) and the torque plate (9) in an initial state, and an acute angle between the rocker (16) and the bottom plate (13) is smaller than 75 degrees; a coil spring is arranged outside or inside the sleeve guide rod.
5. The apparatus of claim 1, wherein: the torsion mechanism (12) comprises a rocker (16) and a damper of a telescopic structure, the rocker (16) and the damper of the telescopic structure are arranged in a triangular mode between the base plate (13) and the torque plate (9) in an initial state, and an acute angle between the rocker (16) and the base plate (13) is smaller than 75 degrees.
6. The apparatus of claim 1, wherein: the torsion mechanism (12) comprises a rocker (16) and a rigidity-adjustable shock absorber of a telescopic structure, the rocker (16) and the rigidity-adjustable shock absorber are arranged in a triangular mode between the base plate (13) and the torque plate (9) in an initial state, and an acute angle between the rocker (16) and the base plate (13) is smaller than 75 degrees.
7. The apparatus according to any one of claims 1 to 6, wherein: and the torque plate (9) and the bottom plate (13) are provided with spring clamping seats (10).
8. The apparatus of claim 7, wherein: a spiral spring is arranged between a sleeve (4) of the top plate (1) and the guide rod (14) or between the sleeve (4) and the bottom plate (13), a certain distance is reserved between the upper friction plate (2) and the lower friction plate (3) in an initial state, and end fixing devices of the spiral spring (11) are arranged on the torque plate (9) and the bottom plate (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811595749.XA CN109595282B (en) | 2018-12-25 | 2018-12-25 | Rotary type pressure-torsion combined elastic damping device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811595749.XA CN109595282B (en) | 2018-12-25 | 2018-12-25 | Rotary type pressure-torsion combined elastic damping device |
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| Publication Number | Publication Date |
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| CN109595282A CN109595282A (en) | 2019-04-09 |
| CN109595282B true CN109595282B (en) | 2020-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811595749.XA Active CN109595282B (en) | 2018-12-25 | 2018-12-25 | Rotary type pressure-torsion combined elastic damping device |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN88201056U (en) * | 1988-01-27 | 1988-08-31 | 李宁升 | Spring damper |
| EP0362456A1 (en) * | 1988-10-03 | 1990-04-11 | LUIGI FORTUNA & C. S.N.C. | Elastic non-oscillating device |
| CN103896158A (en) * | 2014-04-21 | 2014-07-02 | 上海海事大学 | Friction energy dissipation and seismic mitigation device |
| CN203962817U (en) * | 2014-01-23 | 2014-11-26 | 东风汽车公司 | A kind of heavily loaded damping device |
| CN104315061A (en) * | 2014-10-17 | 2015-01-28 | 无锡市宏源弹性器材有限公司 | Large-load vibration isolator |
| CN108561493A (en) * | 2018-06-28 | 2018-09-21 | 金其彪 | A kind of motorcycle dustproof vibration-damper |
-
2018
- 2018-12-25 CN CN201811595749.XA patent/CN109595282B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN88201056U (en) * | 1988-01-27 | 1988-08-31 | 李宁升 | Spring damper |
| EP0362456A1 (en) * | 1988-10-03 | 1990-04-11 | LUIGI FORTUNA & C. S.N.C. | Elastic non-oscillating device |
| CN203962817U (en) * | 2014-01-23 | 2014-11-26 | 东风汽车公司 | A kind of heavily loaded damping device |
| CN103896158A (en) * | 2014-04-21 | 2014-07-02 | 上海海事大学 | Friction energy dissipation and seismic mitigation device |
| CN104315061A (en) * | 2014-10-17 | 2015-01-28 | 无锡市宏源弹性器材有限公司 | Large-load vibration isolator |
| CN108561493A (en) * | 2018-06-28 | 2018-09-21 | 金其彪 | A kind of motorcycle dustproof vibration-damper |
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| CN109595282A (en) | 2019-04-09 |
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Application publication date: 20190409 Assignee: HUNAN MINGXIANG TECHNOLOGY DEVELOPMENT Co.,Ltd. Assignor: CENTRAL SOUTH University Contract record no.: X2023980038143 Denomination of invention: Rotary compression torsion combined elastic shock absorber Granted publication date: 20201103 License type: Common License Record date: 20230720 |