CN110285173A - A kind of method and structure of volute spring stiffness tuning - Google Patents
A kind of method and structure of volute spring stiffness tuning Download PDFInfo
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- CN110285173A CN110285173A CN201910624501.XA CN201910624501A CN110285173A CN 110285173 A CN110285173 A CN 110285173A CN 201910624501 A CN201910624501 A CN 201910624501A CN 110285173 A CN110285173 A CN 110285173A
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- rubber bodies
- straightway
- volute spring
- partition
- interior
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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
- F16F1/00—Springs
- F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
- F16F1/38—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers with a sleeve of elastic material between a rigid outer sleeve and a rigid inner sleeve or pin, i.e. bushing-type
- F16F1/387—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers with a sleeve of elastic material between a rigid outer sleeve and a rigid inner sleeve or pin, i.e. bushing-type comprising means for modifying the rigidity in particular directions
-
- 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
- F16F1/00—Springs
- F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
- F16F1/38—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers with a sleeve of elastic material between a rigid outer sleeve and a rigid inner sleeve or pin, i.e. bushing-type
- F16F1/393—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers with a sleeve of elastic material between a rigid outer sleeve and a rigid inner sleeve or pin, i.e. bushing-type with spherical or conical sleeves
- F16F1/3935—Conical sleeves
-
- 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
- F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
- F16F2228/06—Stiffness
-
- 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
- F16F2234/00—Shape
- F16F2234/04—Shape conical
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Springs (AREA)
Abstract
A kind of volute spring stiffness tuning method, volute spring includes housing, rubber bodies and mandrel, rubber bodies vulcanize between housing and mandrel, in the outside of mandrel lower end, flange is set, partition is set in rubber bodies, make the lower end of the interior rubber bodies between mandrel and partition when moving down, by the double constraints of flange and partition, to increase the vertical stiffness of volute spring.The partition of vertical characteristics is set in rubber bodies, make the lower end of the interior rubber bodies between mandrel and partition when moving down, evagination segmental arc and evagination straightway are gradually bonded to the upper surface of flange, and be limited in the space surrounded on the inside of mandrel outside, the upper surface of flange and partition, so as to increase considerably the vertical stiffness of volute spring.In the three-stage partition for the vertical characteristics being arranged in rubber bodies, to increase the non-linear of volute spring vertical stiffness, and increase the lateral stiffness of volute spring.
Description
Technical field
The present invention relates to field of track traffic, and in particular to the improvement of the volute spring on vehicle.
Background technique
Volute spring is also known as journal box spring, refers mainly to bullet with damping effect of the metal in conjunction with rubber on vehicle
Spring.Volute spring, which is mounted between rail car axle box and framework, plays support, damping noise reduction, is a kind of common rubber
The vibration and noise reducing element of glue metal composite, is mounted on the car body of vehicle vehicle single stage suspension and secondary suspension, and main function is
Bear the load of car body and framework.It is sulfided under certain temperature and pressure with rubber by adhesive using cone-shaped metal part
One entirety, effect are that vibration damping, Noise Reduction are played using vulcanized rubber, and metalwork plays bearing and installation interface.
With the development of vehicle vehicle technology, especially high-speed rail EMU, urban rail, subway and low floor vehicle technology hair
Exhibition, volute spring guarantee demanding kinetics and the safety of vehicle in order to preferably meet, it is desirable that volute spring vertical stiffness has
Variation rigidity, and there can be no vertical stiffnesses inverse S-curve phenomenon occurs.It is existing that inverse S-curve occurs in current volute spring vertical stiffness
As volute spring vertical stiffness is too small caused when mainly unloaded.In addition, vehicle may require that in acceleration, deceleration or turning
Volute spring has suitable lateral stiffness and longitudinal rigidity, and vehicle is made more to meet demanding kinetics, has good horizontal and vertical
Vibration damping, noise reduction capability.Again as volute spring be made of metal and the vulcanization of rubber it is whole, also inconvenient carry out office cannot be dismantled
Portion is repaired, thus volute spring is the product of lifelong freedom from repairs.With the development of vehicle technology, fatigue load is also more and more severe
It carves, the requirement to fatigue behaviour is more and more tighter, and the structure of current volute spring will appear fold when in use, and the time has grown cone
The rubber part of shape spring can crack, and seriously affect the rigidity of volute spring, to influence its service performance.This just needs one
Kind be not only adjusted rigidity, but can prevent using when there is the volute spring of fold and meet above-mentioned requirements.
Summary of the invention
The technical problem to be solved by the present invention is how to increase the non-linear of the vertical stiffness of volute spring and adjust horizontal
To rigidity.
With the above problem, technical solution proposed by the present invention is needle: a kind of volute spring stiffness tuning method, volute spring
Including housing, rubber bodies and mandrel, rubber bodies vulcanize between housing and mandrel, and flange is arranged in the outside of mandrel lower end,
The partition of setting vertical characteristics, makes the lower end of the interior rubber bodies between mandrel and partition when moving down in rubber bodies, by
The double constraints of flange and partition, to increase the vertical stiffness of volute spring.
Further, the lower end of the interior rubber bodies between mandrel and partition is the lower end of interior rubber bodies when moving down
It is first gradually bonded with the upper surface of flange, and the constraint by flange is unfolded outward, the vertical stiffness of volute spring increases.
Further, as the lower end of interior rubber bodies moves further downward, the constraint of the lower ends of interior rubber bodies in flange
Under further out side be unfolded, the process that the lower end of interior rubber bodies is constantly unfolded outward will receive the constraint of partition, and be limited
It makes in the space surrounded on the outside of mandrel, on the inside of the upper surface of flange and partition, the vertical stiffness of volute spring further increases
Greatly.
Further, the partition for the vertical characteristics being arranged in rubber bodies is three-stage partition, and partition is from top to bottom successively
It is bent into curved first straight line section, second straight line section and third straightway outward, to increase volute spring vertical stiffness
It is non-linear, and increase volute spring lateral stiffness.
Further, the groove to lower recess is arranged by the upper end in rubber bodies, setting is upward in the lower end of rubber bodies
The groove of recess, to reduce volute spring vertical stiffness and lateral stiffness.
A kind of volute spring stiffness tuning structure, volute spring include housing, rubber bodies and mandrel, and rubber bodies vulcanize outside
Between set and mandrel, it is equipped with flange in the outside of mandrel lower end, the partition of vertical characteristics, mandrel and partition are equipped in rubber bodies
Between rubber bodies be interior rubber bodies；The lower end of interior rubber bodies between mandrel and partition is equipped with evagination segmental arc and evagination straight line
Section, one end of evagination segmental arc are connect with mandrel, and the other end of evagination segmental arc is connect with evagination straightway.
Further, rubber bodies are separated into outer rubber body and interior rubber bodies by partition, the rubber bodies between mandrel and partition
For interior rubber bodies, the rubber bodies between partition and housing are outer rubber body；Partition is disposed with outside lateral bend from top to bottom
First straight line section, second straight line section and third straightway.
Further, interior rubber bodies further include indent segmental arc and indent straightway, and indent segmental arc is arranged in evagination straightway
Between indent straightway, and indent segmental arc is the arc groove of inside rubber bodies recess.
Further, outer rubber body lower end is equipped with the lower end external groove that is recessed upwards, lower end external groove include outer straightway,
Outer arc segments, middle straightway, interior segmental arc and interior straightway, outer straightway are located at the inside of housing lower end, and interior straightway is located at partition
Outside；It is equipped with outer arc segments between outer straightway and middle straightway, interior segmental arc is equipped between interior straightway and middle straightway.
Further, the angle between outer straightway and middle straightway is 50 degree of -65 degree, interior straightway and middle straightway it
Between angle be 110 degree -130 degree.
The invention has the advantages that
1. the partition of vertical characteristics is arranged in rubber bodies, moving down the lower end of the interior rubber bodies between mandrel and partition
When, evagination segmental arc and evagination straightway are gradually bonded to the upper surface of flange, and are limited on the outside of mandrel, the upper surface of flange
With in the space that is surrounded on the inside of partition, so as to increase considerably the vertical stiffness of volute spring.
2. in the three-stage partition for the vertical characteristics being arranged in rubber bodies, to increase the non-of volute spring vertical stiffness
Linearly, and increase volute spring lateral stiffness.
3. by being played in the both ends recessing of interior rubber bodies and outer rubber body to reduce vertical stiffness and lateral stiffness
The effect of the vertical stiffness and lateral stiffness of volute spring is adjusted, and groove can also generate deformation in interior rubber bodies and outer rubber body
When avoid the occurrence of wrinkle, extend the service life of volute spring, reduce the cost of replacement volute spring.
Detailed description of the invention
Fig. 1 is the schematic cross-sectional view of embodiment one；
Fig. 2 is the partial enlarged view one of a-quadrant in Fig. 1；
Fig. 3 is the partial enlarged view two of a-quadrant in Fig. 1；
Fig. 4 is the partial enlarged view of B area in Fig. 1；
Fig. 5 is the schematic cross-sectional view of partition in embodiment one；
Fig. 6 is the vertical stiffness curve graph of volute spring in embodiment one.
In figure: 1 housing, 2 mounting holes, 3 outer rubber bodies, 31 outer straightways, 32 outer arc segments, straightway in 33, segmental arc in 34,
Straightway in 35,36 upper end external grooves, 4 partitions, 41 first straight line sections, 42 second straight line sections, 43 third straightways, rubber in 5
Body, 51 evagination segmental arcs, 52 evagination straightways, 53 indent segmental arcs, 54 indent straightways, 55 upper end inner groovies, 6 flanges, 7 mandrels.
Specific embodiment
Below with reference to embodiment and attached drawing, the present invention will be further described:
Embodiment one
Volute spring is rotary body, as shown in Figure 1, volute spring includes housing 1, rubber bodies, partition 4 and mandrel 7, wherein housing
1, partition 4 and mandrel 7 are all formed from metal, and housing 1, partition 4 and mandrel 7 are sulfided into an entirety by rubber bodies.In rubber bodies
It is provided with the partition 4 of vertical characteristics, rubber bodies are divided into outer rubber body 3 and interior rubber bodies 5 in rubber bodies by partition 4.Housing 1
On be provided with vertical mounting hole 2, with bolt pass through mounting hole 2, volute spring can be installed on vehicle.In 7 lower end of mandrel
Outside is provided with flange 6, for volute spring when bearing big load, limits the movement of interior 5 lower end of rubber bodies, hangs down to improve
To rigidity.
As shown in Figure 1 and Figure 4, in order to further increase substantially the vertical stiffness of volute spring, partition 4 is extended to
The lower end of interior rubber bodies 5.When volute spring is when bearing big load, housing 1 successively drives outer rubber body 3, partition 4 and interior rubber
Body 5 moves downwardly together.It is equipped with evagination segmental arc 51 and evagination straightway 52 close to the lower end of the interior rubber bodies 5 of 7 side of mandrel, it is interior
When rubber bodies 5 move down, evagination segmental arc 51 and evagination straightway 52 are gradually pasted to the upper surface of flange 6 in a rolling manner
It closes.Blocking of interior 5 lower end of rubber bodies by flange 6, vertical stiffness are gradually increased.As interior rubber bodies 5 and partition 4 continue downwards
It is mobile, in the space that the inside that interior 5 lower end of rubber bodies is limited in 7 outside of mandrel, the upper surface of flange 6 and partition 4 surrounds, resistance
Only interior rubber bodies 5 further generate deformation, and the vertical stiffness of volute spring can increase substantially at this time, and stiffness variation occurs non-thread
Property.
As shown in fig. 6, when load reaches 30KN or so, interior 5 lower end of rubber bodies is fitted in completely in the present embodiment
The upper surface of flange 6 and the inside of partition 4, the shape of the lower end of interior rubber bodies 5 have been limited in a small space, it is difficult to
Continue to generate deformation.Further increasing with load at this time, there have been non-linear, tapers for the vertical stiffness of volute spring
The vertical stiffness of spring can increase substantially.
As shown in Figure 1 and Figure 5, partition 4 is hollow annular shape, and vertical section is three stage structure, by first straight line
The upper end of section 41 is formed by bending second straight line section 42 outward, and it is straight that the lower end of second straight line section 42 is formed by bending third outward
Line segment 43.Wherein the length direction of first straight line section 41 is vertical direction, and the length of second straight line section 42 accounts for 4 total length of partition
65%-80%.And the length direction of second straight line section 42 and the angle in the outside of mandrel 7 be less than 15 degree, the length of second straight line section 42
For the angle of direction and the inside of housing 1 less than 20 degree, the angle of second straight line section 42 and third straightway 43 is greater than 150 degree.
As depicted in figs. 1 and 2, the upper end of outer rubber body 3 is equipped with upper end external groove 36, and upper end external groove 36 is to outer rubber
The arc groove that 3 upper end of body is recessed inwardly.Lower end is equipped with lower end external groove, and lower end external groove is that outside 3 lower end of rubber bodies is inside
The groove of recess, lower end external groove include outer straightway 31, outer arc segments 32, middle straightway 33, interior segmental arc 34 and interior straightway 35,
Outer straightway 31 is located at the inside of 1 lower end of housing, and interior straightway 35 is located at the outside of partition 4.Outer straightway 31 and middle straightway
It is equipped with outer arc segments 32 between 33, interior segmental arc 34 is equipped between interior straightway 35 and middle straightway 33.As shown in figure 3, outer straightway
Angle between 31 and middle straightway 33 is angle C, and angle C's is preferably sized to 50 degree of -65 degree, interior straightway 35 and middle straightway 33
Between angle be angle D, angle D's is preferably sized to 110 degree of -130 degree.
As shown in Figures 1 to 4, the upper end of interior rubber bodies 5 is equipped with upper end inner groovy 55, and upper end inner groovy 55 is inside rubber
The arc groove that 5 upper end of body is recessed inwardly.The lower end of interior rubber bodies 5 is equipped with lower end inner groovy, and lower end inner groovy includes imploded arcs
Section 53 and indent straightway 54, indent segmental arc 53 is arranged between evagination straightway 52 and indent straightway 54, and indent segmental arc
53 arc grooves being recessed for inside rubber bodies 5.
Upper end external groove 36, lower end external groove, the depth of upper end inner groovy 55 and lower end inner groovy are bigger, and volute spring hangs down
It is smaller to rigidity and lateral stiffness.The thickness of interior rubber bodies 5 and outer rubber body 3 is bigger, and volute spring vertical stiffness and transverse direction are just
Spend smaller, in the present embodiment, the thickness of outer rubber body 3 is greater than the thickness of interior rubber bodies 5.Pass through rubber bodies 5 and outer rubber in changing
The thickness of colloid 3 and the depth of groove suitably to reduce the vertical stiffness and lateral stiffness of volute spring, meet vehicle dynamic
Under the premise of mechanical requirements and safety, it can enhance laterally with Vertical Vibration Reduction, noise reduction capability, increase the comfort level of passenger.
Upper end external groove 36, lower end external groove, the shape of upper end inner groovy 55 and lower end inner groovy also ensure Conical Projectile
Spring is when bearing big load, during interior rubber bodies 5 and outer rubber body 3 move down, interior rubber bodies 5 and outer rubber body 3
Top and bottom will not all generate wrinkle, increase considerably 3 anti-fatigue performance of interior rubber bodies 5 and outer rubber body, prevent Conical Projectile
The rubber part of spring can crack.Since the thickness of outer rubber body 3 is greater than the thickness of interior rubber bodies 5, if lower end external groove is letter
Single arc groove, then lower end external groove is also easy to produce wrinkle, 3 lower end of outer rubber body is easy when outer 3 lower end of rubber bodies generates shape and spends
Occur damaged.And volute spring is due to that cannot split, and be non-maintaining product, be damaged at one once having, then needing will be entire
Volute spring replacement, it is costly.
It will be apparent that without departing from the principles of the present invention, several improvement or modification made are regarded as this
The protection scope of invention.
Claims (10)
1. a kind of volute spring stiffness tuning method, volute spring includes housing (1), rubber bodies and mandrel (7), rubber bodies vulcanization
Between housing (1) and mandrel (7), which is characterized in that flange (6) are set in the outside of mandrel (7) lower end, are set in rubber bodies
Set partition (4), make the lower end of the interior rubber bodies (5) between mandrel (7) and partition (4) when moving down, by flange (6) and
The double constraints of partition (4), to increase the vertical stiffness of volute spring.
2. a kind of volute spring stiffness tuning method according to claim 1, which is characterized in that mandrel (7) and partition (4)
Between interior rubber bodies (5) lower end when moving down, be interior rubber bodies (5) lower end first with the upper surface of flange (6) by
It is gradually bonded, and the constraint by flange (6) is unfolded outward, the vertical stiffness of volute spring increases.
3. a kind of volute spring stiffness tuning method according to claim 2, which is characterized in that with interior rubber bodies (5)
Lower end move further downward, the lower end of interior rubber bodies (5) under the constraint of flange (6) further out side be unfolded, interior rubber
The process that the lower end of colloid (5) is constantly unfolded outward will receive the constraint of partition (4), and be limited on the outside of mandrel (7), method
In the space surrounded on the inside of the upper surface of blue (6) and partition (4), the vertical stiffness of volute spring is further increased.
4. a kind of volute spring stiffness tuning method according to claim 1, which is characterized in that be arranged in rubber bodies
The partition (4) of vertical characteristics is three-stage partition (4), and partition (4) successively bends into curved first straight outward from top to bottom
Line segment (41), second straight line section (42) and third straightway (43), thus increase the non-linear of volute spring vertical stiffness, and
Increase the lateral stiffness of volute spring.
5. a kind of volute spring stiffness tuning method according to claim 1, which is characterized in that by the upper of rubber bodies
The groove being recessed upwards is arranged in the lower end of rubber bodies to the groove of lower recess for end setting, so that it is vertical just to reduce volute spring
Degree and lateral stiffness.
6. a kind of volute spring stiffness tuning structure, volute spring includes housing (1), rubber bodies and mandrel (7), rubber bodies vulcanization
Between housing (1) and mandrel (7), which is characterized in that be equipped with flange (6) in the outside of mandrel (7) lower end, set in rubber bodies
Have partition (4), the rubber bodies between mandrel (7) and partition (4) are interior rubber bodies (5)；It is interior between mandrel (7) and partition (4)
The lower end of rubber bodies (5) is equipped with evagination segmental arc (51) and evagination straightway (52), and one end and mandrel (7) of evagination segmental arc (51) are even
It connects, the other end of evagination segmental arc (51) is connect with evagination straightway (52).
7. a kind of volute spring stiffness tuning structure according to claim 6, which is characterized in that partition (4) is by rubber bodies
It is separated into outer rubber body (3) and interior rubber bodies (5), the rubber bodies between mandrel (7) and partition (4) are interior rubber bodies (5), partition
(4) rubber bodies between housing (1) are outer rubber body (3)；Partition (4) is disposed with curved outward from top to bottom
One straightway (41), second straight line section (42) and third straightway (43).
8. a kind of volute spring stiffness tuning structure according to claim 6 or 7, which is characterized in that interior rubber bodies (5) are also
Including indent segmental arc (53) and indent straightway (54), indent segmental arc (53) is arranged in evagination straightway (52) and indent straightway
(54) between, and indent segmental arc (53) is the arc groove of inside rubber bodies (5) recess.
9. a kind of volute spring stiffness tuning structure according to claim 7, which is characterized in that outer rubber body (3) lower end
Equipped with the lower end external groove being recessed upwards, lower end external groove include outer straightway (31), outer arc segments (32), middle straightway (33),
Interior segmental arc (34) and interior straightway (35), outer straightway (31) are located at the inside of housing (1) lower end, interior straightway (35) be located at every
The outside of plate (4)；Outer arc segments (32) are equipped between outer straightway (31) and middle straightway (33), interior straightway (35) and middle straight line
Interior segmental arc (34) are equipped between section (33).
10. a kind of volute spring stiffness tuning structure according to claim 9, which is characterized in that outer straightway (31) with
Angle between middle straightway (33) is 50 degree of -65 degree, and the angle between interior straightway (35) and middle straightway (33) is 110
- 130 degree of degree.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910624501.XA CN110285173A (en) | 2019-07-11 | 2019-07-11 | A kind of method and structure of volute spring stiffness tuning |
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| CN201910624501.XA CN110285173A (en) | 2019-07-11 | 2019-07-11 | A kind of method and structure of volute spring stiffness tuning |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110816576A (en) * | 2019-11-11 | 2020-02-21 | 株洲时代新材料科技股份有限公司 | Method and device for improving fatigue life of elastic side bearing |
| CN110979376A (en) * | 2020-01-14 | 2020-04-10 | 株洲时代新材料科技股份有限公司 | Rigidity adjusting method and structure of primary suspension device |
| CN112370760A (en) * | 2020-11-10 | 2021-02-19 | 宁波市鄞州风名工业产品设计有限公司 | Rebound damping support structure of boxing target |
| CN113232689A (en) * | 2021-05-12 | 2021-08-10 | 株洲时代瑞唯减振装备有限公司 | Method for improving deformation resistance of elastic bushing and large-deformation elastic bushing |
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| US20020060385A1 (en) * | 2000-11-17 | 2002-05-23 | Mannesmann Boge Gmbh | Hydraulically damping rubber bearing |
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| AT400175B (en) * | 1991-03-01 | 1995-10-25 | Jenbacher Transportsysteme | SPRING ELEMENT |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110816576A (en) * | 2019-11-11 | 2020-02-21 | 株洲时代新材料科技股份有限公司 | Method and device for improving fatigue life of elastic side bearing |
| CN110979376A (en) * | 2020-01-14 | 2020-04-10 | 株洲时代新材料科技股份有限公司 | Rigidity adjusting method and structure of primary suspension device |
| CN112370760A (en) * | 2020-11-10 | 2021-02-19 | 宁波市鄞州风名工业产品设计有限公司 | Rebound damping support structure of boxing target |
| CN113232689A (en) * | 2021-05-12 | 2021-08-10 | 株洲时代瑞唯减振装备有限公司 | Method for improving deformation resistance of elastic bushing and large-deformation elastic bushing |
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Effective date of registration: 20200603 Address after: 412007 No.301, physical and chemical building, Liyu Industrial Park, no.639, Heilongjiang Road, Tianyuan District, Zhuzhou City, Hunan Province Applicant after: Zhuzhou Times Ruiwei damping equipment Co., Ltd Address before: 412007 No. 18 Haitian Road, Tianyuan District, Hunan, Zhuzhou Applicant before: Zhuzhou Times New Material Technology Co.,Ltd. |
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Application publication date: 20190927 |