CN111677816A - Damping wheel capable of automatically adjusting damping by utilizing winsler phenomenon principle - Google Patents
Damping wheel capable of automatically adjusting damping by utilizing winsler phenomenon principle Download PDFInfo
- Publication number
- CN111677816A CN111677816A CN202010562793.1A CN202010562793A CN111677816A CN 111677816 A CN111677816 A CN 111677816A CN 202010562793 A CN202010562793 A CN 202010562793A CN 111677816 A CN111677816 A CN 111677816A
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- Prior art keywords
- damping
- wheel
- inertia
- fixedly connected
- winsler
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/18—Suppression of vibrations in rotating systems by making use of members moving with the system using electric, magnetic or electromagnetic means
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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
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
- F16F15/121—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon using springs as elastic members, e.g. metallic springs
- F16F15/123—Wound springs
- F16F15/12306—Radially mounted springs
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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
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
- F16F15/121—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon using springs as elastic members, e.g. metallic springs
- F16F15/123—Wound springs
- F16F15/12353—Combinations of dampers, e.g. with multiple plates, multiple spring sets, i.e. complex configurations
-
- 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
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/16—Suppression of vibrations in rotating systems by making use of members moving with the system using a fluid or pasty material
- F16F15/161—Suppression of vibrations in rotating systems by making use of members moving with the system using a fluid or pasty material characterised by the fluid damping devices, e.g. passages, orifices
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Electromagnetism (AREA)
- Vibration Dampers (AREA)
- Fluid-Damping Devices (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention relates to the technical field of shock absorbers and discloses a damping wheel capable of automatically adjusting damping by utilizing the Winstlow phenomenon principle. The damping wheel with the damping capable of being automatically adjusted by utilizing the Winstor phenomenon principle achieves the effect of automatically adjusting the damping through the matched use of the upper contact, the lower contact, the current variant, the heavy block, the inertia bin, the inertia contact and the coil.
Description
Technical Field
The invention relates to the technical field of shock absorbers, in particular to a damping wheel with automatically adjustable damping by utilizing a Winstone phenomenon principle.
Background
The shock absorber is used for inhibiting the shock when the spring absorbs the shock and rebounds and the impact from the road surface. The damping device is widely applied to automobiles and is used for accelerating the attenuation of the vibration of a frame and an automobile body so as to improve the driving smoothness of the automobiles. When the shock absorber passes through the uneven road surface, although the shock absorbing spring can filter the shock of the road surface, the spring can still reciprocate, and the shock absorber is used for inhibiting the spring from jumping.
Shock absorbers rely on damping forces to dampen the spring jump. The damping force is too small, the vehicle body jumps up and down, and the too large damping force brings too large resistance to the normal work of the spring. Common bumper shock absorber damping system damping value is fixed, and the bumper shock absorber spring rebound velocity is fixed, leads to in the in-service use in-process needs according to external conditions manual regulation, and is too loaded down with trivial details.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the damping wheel which utilizes the Winstone phenomenon principle and has the damping capable of being automatically adjusted, has the advantage of automatically adjusting the damping, and solves the problem of fixed damping value.
(II) technical scheme
In order to achieve the purpose of automatically adjusting the damping, the invention provides the following technical scheme: a damping wheel capable of automatically adjusting damping by utilizing the Winstlow phenomenon principle comprises a main shaft, wherein a bearing is connected to the outer ring of the main shaft in a surrounding manner, a shock absorber is fixedly connected to the bearing, a damping plate is fixedly connected to the outer ring of the shock absorber, a damping plate is fixedly connected to the lower end of the damping plate, a through hole is formed in the damping plate, an upper contact is fixedly connected to the surface of the lower end of the damping plate, a shock absorbing rod is movably connected to the lower end of the damping plate, an electrorheological body is placed in the shock absorbing rod, a lower contact is fixedly connected to the surface of the lower end of the shock absorbing rod, a damping spring is connected to the outer ring of the damping rod in a surrounding manner, an inertia spring is fixedly connected to the outer ring of the bearing, a weight is fixedly connected to the outer end of the inertia spring, an inertia bin is movably sleeved, the outer lane fixedly connected with spoke of bearing, the inside fixedly connected with coil of spoke, the outer lane fixedly connected with magnet of main shaft.
Preferably, the main materials of the electrorheological fluid are gypsum, lime, carbon powder and olive oil.
Preferably, the inertia contact is provided with two inertia contacts which are respectively arranged at the top end and the middle end of the inertia cabin.
Preferably, the inertia spring is mainly made of iron-nickel alloy, and the surface of the outer ring is in contact with the inertia contact.
Preferably, the coil, the inertia contact, the upper contact and the lower contact are connected in series with each other.
Preferably, spoke and coil are provided with four respectively, and respectively the even connection in the outer lane of bearing, and the outer end fixedly connected with buffer layer of spoke, its buffer layer cup joints inside the tire.
Preferably, the damping plate, the through hole, the upper contact, the damping rod, the current transformer, the lower contact and the damping spring are respectively provided in three numbers, and are uniformly connected to the outer ring of the bearing in a surrounding manner.
Preferably, two poles of the magnet are respectively arranged on two sides of the damping wheel.
(III) advantageous effects
Compared with the prior art, the invention provides the damping wheel which utilizes the Winstone phenomenon principle and has the damping capable of being automatically adjusted, and the damping wheel has the following beneficial effects:
1. this but damping automatically regulated's that utilizes wen si luo phenomenon principle shock attenuation wheel uses through bumper shock absorber, damping plate, through-hole, shock attenuation pole and damping spring's cooperation to reached whole structure absorbing effect, reduced the vibrations that use shock attenuation wheel equipment, fall to the damage that equipment received to minimum, prolonged the life of equipment.
2. This but damping wheel of damping automatically regulated who utilizes wen si luo phenomenon principle uses through the cooperation of last contact, lower contact, current variant, pouring weight, inertia storehouse, inertia contact and coil to reached damping automatically regulated's effect, reduced damping spring's loss, prolonged the life of equipment, further promoted whole equipment's shock attenuation effect simultaneously, compared and possess better practicality in current structure.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of an inertial chamber according to the present invention;
FIG. 3 is a schematic view of the spoke and magnet structure of the present invention;
FIG. 4 is a schematic cross-sectional view of a shock absorbing rod according to the present invention;
FIG. 5 is a side view of the shock absorbing wheel structure of the present invention.
In the figure: 1. a main shaft; 2. a bearing; 3. a shock absorber; 4. a damper plate; 5. a damping plate; 6. a through hole; 7. an upper contact; 8. a shock-absorbing lever; 9. an electrorheological fluid; 10. a lower contact; 11. a damping spring; 12. an inertia spring; 13. a weight block; 14. an inertial bin; 15. an inertial contact; 16. spokes; 17. a coil; 18. and a magnet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, a damping wheel capable of automatically adjusting damping based on the winsler phenomenon comprises a main shaft 1, wherein a bearing 2 is connected to the outer ring of the main shaft 1 in a surrounding manner, a shock absorber 3 is fixedly connected to the bearing 2, a shock absorbing plate 4 is fixedly connected to the outer ring of the shock absorber 3, a damping plate 5 is fixedly connected to the lower end of the shock absorbing plate 4, a through hole 6 is formed in the damping plate 5, an upper contact 7 is fixedly connected to the surface of the lower end of the shock absorbing plate 4, a shock absorbing rod 8 is movably connected to the lower end of the shock absorbing plate 4, an electrorheological body 9 is placed in the shock absorbing rod 8, and the electrorheological body 9 is mainly made of gypsum, lime, carbon. The current variant 9 is liquid when not connected with electricity, becomes hard after being connected with electricity, and the hardness is in direct proportion to the magnitude of the connected current.
The lower end surface of the shock-absorbing rod 8 is fixedly connected with a lower contact 10, and the coil 17, the inertia contact 15, the upper contact 7 and the lower contact 10 are connected in series with each other. The current generated by the coil 17 will be conducted into the current transformer 9 via the respective contacts.
The outer ring of the damping rod 8 is connected with a damping spring 11 in a surrounding mode, the damping plate 4, the damping plate 5, the through hole 6, the upper contact 7, the damping rod 8, the current transformer 9, the lower contact 10 and the damping spring 11 are respectively arranged in three numbers, and the three numbers are evenly connected to the outer ring of the bearing 2 in a surrounding mode. A plurality of shock attenuation equipment can improve the shock attenuation effect of whole shock attenuation wheel.
An inertia spring 12 is fixedly connected to an outer ring of the bearing 2, the main material of the inertia spring 12 is iron-nickel alloy, and the surface of the outer ring is in contact with an inertia contact 15. The iron-nickel alloy on the one hand ensures the elasticity of the inertia spring 12 and on the other hand provides a certain degree of resistance.
The outer end of the inertia spring 12 is fixedly connected with a heavy block 13, the outer ring of the inertia spring 12 is movably sleeved with an inertia bin 14, the inner wall surface of the inertia bin 14 is fixedly connected with two inertia contacts 15, and the two inertia contacts 15 are respectively arranged at the top end and the middle end of the inertia bin 14. When the inertia spring 12 is stretched, the length of the inertia spring 12 connected between the inertia contacts 15 at the middle end is reduced, the resistance value in the circuit is reduced, and the current is increased, otherwise, the resistance value is increased, and the current is reduced.
The outer lane fixedly connected with spoke 16 of bearing 2, the inside fixedly connected with coil 17 of spoke 16, spoke 16 and coil 17 are provided with four respectively, and respectively the uniform connection in the outer lane of bearing 2, the outer end fixedly connected with buffer layer of spoke 16, and its buffer layer cup joints inside the tire. The buffer layer can cooperate the shock attenuation wheel to improve the shock attenuation effect, and the buffering is at the distance change between 16 spokes and the tire of shock attenuation in-process simultaneously.
The outer ring of the main shaft 1 is fixedly connected with a magnet 18. Two poles of the magnet 18 are respectively arranged on two sides of the damping wheel. The lines of magnetic induction between the poles of the magnet 18 will pass through the coil 17.
The working principle is as follows: when the shock absorption wheel rotates, the shock absorption plate 4, the damping plate 5 and other fixedly connected structures are driven to rotate through the shock absorber 3, and when external force is applied, the shock absorption wheel absorbs shock through compression and stretching of the shock absorption spring 11. In the stretching and compressing processes of the damping spring 11, the current variant 9 inside the damping rod 8 continuously passes through the through hole 6 formed inside the damping plate 5, and the liquid has certain resistance, so that the rebound of the damping spring 11 is slowed down under the driving of the damping plate 5 and the damping plate 4.
When the rotating speed of the damping wheel is increased, the coil 17 inside the spoke 16 cuts a magnetic induction line between magnetic poles of the magnet 18, induction current is generated in the coil 17, the current variant 9 is connected through the inertia contact 15, the upper contact 7 and the lower contact 10, the current variant 9 is electrified and becomes hard in texture, so that damping is increased, rebound of the damping spring 11 is slowed down, meanwhile, the rotating speed of the damping wheel is increased, centrifugal force applied to the weight 13 is increased, the inertia spring 12 is stretched, resistance connected between the inertia contacts 15 is reduced due to the fact that the length is shortened, current in a circuit is increased, the hardness of the current variant 9 is further improved, and the damping value is increased.
The larger the rotating speed of the damping wheel is, the larger the induced current of the coil 17 is, the smaller the resistance value between the inertia contacts 15 is, the larger the circuit in the circuit is, the larger the rigidity of the current variant 9 is, the larger the damping is, the smaller the rebound speed of the damping spring 11 is, on the contrary, the smaller the rotating speed of the damping wheel is, the smaller the induced current of the coil 17 is, the larger the resistance value between the inertia contacts 15 is, the smaller the circuit in the circuit is, the smaller the rigidity of the current variant 9 is, the smaller the damping is, the larger the rebound speed of the damping spring 11 is, and thus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides an utilize damping of winsler phenomenon principle can automatically regulated's shock attenuation wheel, includes main shaft (1), its characterized in that: the outer ring of the main shaft (1) is connected with a bearing (2) in a surrounding manner, a shock absorber (3) is fixedly connected with the bearing (2), a shock absorption plate (4) is fixedly connected with the outer ring of the shock absorber (3), a damping plate (5) is fixedly connected with the lower end of the shock absorption plate (4), a through hole (6) is formed in the damping plate (5), an upper contact (7) is fixedly connected with the surface of the lower end of the shock absorption plate (4), a shock absorption rod (8) is movably connected with the lower end of the shock absorption plate (4), an electric current variant body (9) is placed in the shock absorption rod (8), a lower contact (10) is fixedly connected with the surface of the lower end of the shock absorption rod (8), a shock absorption spring (11) is connected in a surrounding manner with the outer ring of the shock absorption rod (8), an inertia spring (12) is fixedly connected with the outer ring of the bearing, inertia storehouse (14) has been cup jointed in the outer lane activity of inertia spring (12), the inner wall fixed surface in inertia storehouse (14) is connected with inertial contact (15), the outer lane fixedly connected with spoke (16) of bearing (2), the inside fixedly connected with coil (17) of spoke (16), the outer lane fixedly connected with magnet (18) of main shaft (1).
2. The wheel according to claim 1, wherein the damping of the wheel is automatically adjustable according to winsler's principle, and further comprising: the main materials of the electrorheological fluid (9) are gypsum, lime, carbon powder and olive oil.
3. The wheel according to claim 1, wherein the damping of the wheel is automatically adjustable according to winsler's principle, and further comprising: the two inertia contacts (15) are arranged and are respectively arranged at the top end and the middle end of the inertia cabin (14).
4. The wheel according to claim 1, wherein the damping of the wheel is automatically adjustable according to winsler's principle, and further comprising: the main material of inertia spring (12) is iron-nickel alloy, and outer lane surface contacts with inertia contact (15).
5. The wheel according to claim 1, wherein the damping of the wheel is automatically adjustable according to winsler's principle, and further comprising: the coil (17), the inertia contact (15), the upper contact (7) and the lower contact (10) are connected in series.
6. The wheel according to claim 1, wherein the damping of the wheel is automatically adjustable according to winsler's principle, and further comprising: spoke (16) and coil (17) are provided with four respectively, and evenly connect respectively in the outer lane of bearing (2), and the outer end fixedly connected with buffer layer of spoke (16), its buffer layer cup joints inside the tire.
7. The wheel according to claim 1, wherein the damping of the wheel is automatically adjustable according to winsler's principle, and further comprising: the damping plate (4), the damping plate (5), the through hole (6), the upper contact (7), the damping rod (8), the current transformer (9), the lower contact (10) and the damping spring (11) are respectively provided with three parts and are uniformly connected to the outer ring of the bearing (2) in a surrounding mode.
8. The wheel according to claim 1, wherein the damping of the wheel is automatically adjustable according to winsler's principle, and further comprising: two poles of the magnet (18) are respectively arranged on two sides of the damping wheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010562793.1A CN111677816A (en) | 2020-06-19 | 2020-06-19 | Damping wheel capable of automatically adjusting damping by utilizing winsler phenomenon principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010562793.1A CN111677816A (en) | 2020-06-19 | 2020-06-19 | Damping wheel capable of automatically adjusting damping by utilizing winsler phenomenon principle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111677816A true CN111677816A (en) | 2020-09-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010562793.1A Withdrawn CN111677816A (en) | 2020-06-19 | 2020-06-19 | Damping wheel capable of automatically adjusting damping by utilizing winsler phenomenon principle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111677816A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112092533A (en) * | 2020-09-25 | 2020-12-18 | 南京开荆扉电子商务有限公司 | Radar car shock attenuation wheel suitable for high-end equipment is made |
| CN112176560A (en) * | 2020-09-30 | 2021-01-05 | 浙江福隆汽车零部件有限公司 | Utilize sewing machine automatic oiling rust cleaning structure of electromagnetism principle |
| CN112172412A (en) * | 2020-09-28 | 2021-01-05 | 杭州昌墨科技有限公司 | Shock attenuation wheel suitable for portable computer auxiliary equipment |
| CN112185074A (en) * | 2020-09-28 | 2021-01-05 | 杨美兰 | Overload early warning device manufactured by utilizing rheopectic energy-saving furniture |
| CN112208988A (en) * | 2020-09-26 | 2021-01-12 | 刘亚琼 | Manipulator for logistics warehouse management |
| CN112483584A (en) * | 2020-11-26 | 2021-03-12 | 谢一凡 | Can be according to bumper shock absorber of speed automatically regulated soft or hard degree |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TW201038418A (en) * | 2009-04-24 | 2010-11-01 | Univ St Johns | Structure of shock absorbing rim |
| CN203318574U (en) * | 2013-06-28 | 2013-12-04 | 三峡大学 | Power supply device for bicycle wheels |
| CN105570376A (en) * | 2015-12-31 | 2016-05-11 | 浙江科技学院 | Electrorheological fluid shock absorber |
| CN108891195A (en) * | 2018-07-26 | 2018-11-27 | 佛山神航科技有限公司 | A kind of damping wheel |
| CN110356166A (en) * | 2019-06-26 | 2019-10-22 | 魏长同 | A kind of shock-absorbing wheel |
| CN110445313A (en) * | 2019-08-22 | 2019-11-12 | 杭州芯意智能科技有限公司 | It is a kind of can overload protection window lifting motor |
-
2020
- 2020-06-19 CN CN202010562793.1A patent/CN111677816A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201038418A (en) * | 2009-04-24 | 2010-11-01 | Univ St Johns | Structure of shock absorbing rim |
| CN203318574U (en) * | 2013-06-28 | 2013-12-04 | 三峡大学 | Power supply device for bicycle wheels |
| CN105570376A (en) * | 2015-12-31 | 2016-05-11 | 浙江科技学院 | Electrorheological fluid shock absorber |
| CN108891195A (en) * | 2018-07-26 | 2018-11-27 | 佛山神航科技有限公司 | A kind of damping wheel |
| CN110356166A (en) * | 2019-06-26 | 2019-10-22 | 魏长同 | A kind of shock-absorbing wheel |
| CN110445313A (en) * | 2019-08-22 | 2019-11-12 | 杭州芯意智能科技有限公司 | It is a kind of can overload protection window lifting motor |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112092533A (en) * | 2020-09-25 | 2020-12-18 | 南京开荆扉电子商务有限公司 | Radar car shock attenuation wheel suitable for high-end equipment is made |
| CN112208988A (en) * | 2020-09-26 | 2021-01-12 | 刘亚琼 | Manipulator for logistics warehouse management |
| CN112208988B (en) * | 2020-09-26 | 2021-12-28 | 深圳博创机器人技术有限公司 | Manipulator for logistics warehouse management |
| CN112172412A (en) * | 2020-09-28 | 2021-01-05 | 杭州昌墨科技有限公司 | Shock attenuation wheel suitable for portable computer auxiliary equipment |
| CN112185074A (en) * | 2020-09-28 | 2021-01-05 | 杨美兰 | Overload early warning device manufactured by utilizing rheopectic energy-saving furniture |
| CN112185074B (en) * | 2020-09-28 | 2021-12-21 | 江西行宇家具制造有限公司 | Overload early warning device manufactured by utilizing rheopectic energy-saving furniture |
| CN112176560A (en) * | 2020-09-30 | 2021-01-05 | 浙江福隆汽车零部件有限公司 | Utilize sewing machine automatic oiling rust cleaning structure of electromagnetism principle |
| CN112483584A (en) * | 2020-11-26 | 2021-03-12 | 谢一凡 | Can be according to bumper shock absorber of speed automatically regulated soft or hard degree |
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Application publication date: 20200918 |