CN208331097U - A kind of transplanting machine vibration slowing device with class bearing structure - Google Patents
A kind of transplanting machine vibration slowing device with class bearing structure Download PDFInfo
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- CN208331097U CN208331097U CN201820462364.5U CN201820462364U CN208331097U CN 208331097 U CN208331097 U CN 208331097U CN 201820462364 U CN201820462364 U CN 201820462364U CN 208331097 U CN208331097 U CN 208331097U
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- pole
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Abstract
The utility model provides a kind of transplanting machine vibration slowing device with class bearing structure, spiral-tube in the utility model is class bearing construction, outer layer sleeve is moved synchronously with spiral-tube, and the inner layer sleeve embedded with stub rotates movement by the borded pile in helical orbit and inner layer sleeve, so that stub does cutting magnetic induction line movement during rotary motion, generate induced current, and then magnetic field is generated in the electromagnet being connected with stub, the vibration that vibrating object is occurred slows down.
Description
Technical field
The utility model belongs to agricultural mechanical field, and in particular to a kind of transplanting machine vibration with class bearing structure slows down
Device.
Background technique
For transplanter when field carries out operation, operation and working environment due to itself engine and other devices are not
Certainty, the case where inevitably will appear itself vibration, pitch, and these vibrations all can to human body and it is mechanical itself
Cause a degree of damage.In terms of cardiovascular and cerebrovascular diseases especially multiple to nowadays China: in nervous system, such as greatly
Cortex hypodynamia, spinal center, vegetative nerve, vestibular organ are impacted, and dermal sensation gets muddled, wherein especially with vibration
Feel and the change of the pain sensation is most obvious.In cardiovascular system, for example, the change of surrounding capillaries tension, peripheral vessels nerve
Obstacle occurs for regulative mechanism, and cardiac muscle can change, most important to change the exception in terms of being the rhythm and pace of moving things with conduction system, wherein bradycardia
Person accounts for the 42.5% of subject number, and mostly with sinus arrhythmia.These vibrations itself also have larger impact to mechanical, than
Instrument and equipment function is such as influenced, the operating accuracy of mechanical equipment is reduced, aggravates component wear, or even structural fatigue is caused to destroy,
And in terms of transmission gear, fracture as tooth surface damage, tooth surface plastic deformation, gear teeth crackle, overload occurs, corrosive wear, cavitation erosion
Failure etc..So operating personnel's body and the mechanical damage by the longer time in itself are avoided in order to slow down these vibrations,
Staff's working efficiency is improved, prolonged mechanical service life promotes homework precision, and the utility model proposes a kind of transplanters
Vibration slowing device and its oscillation damping method.
Utility model content
The purpose of the utility model is to provide a kind of transplanting machine vibration slowing device with class bearing structure, this is practical new
Spiral-tube in type is class bearing construction, and outer layer sleeve is moved synchronously with spiral-tube, and the inner layer sleeve embedded with stub passes through
Borded pile in helical orbit and inner layer sleeve rotates movement, so that stub does cutting magnetic during rotary motion
Feel line movement, generates induced current, and then generate magnetic field in the electromagnet being connected with stub, vibrating object is occurred
Vibration is slowed down.
In order to achieve the above object, the used technical solution of the utility model is: a kind of with class bearing structure
Transplant machine vibration slowing device, which is connected with vibrating object, the vibration for vibrating object to be occurred into
Row slows down, which includes outer cylinder, inner cylinder, spiral-tube and bottom plate, the top phase of vibrating object and the outer cylinder
Even, the bottom end of the inner cylinder is arranged in the bottom plate, and the inside of the outer cylinder and the inner cylinder is respectively arranged with cavity I and cavity
II, the outer cylinder is set on the outer wall of the inner cylinder and the outer cylinder can slide on the outer wall of the inner cylinder, the outer cylinder
The opening I being connected with the cavity I is offered in one end far from vibrating object, the inner cylinder is in one far from the bottom plate
End offers the opening II being connected with the cavity II, and the cavity I is provided with the pole N magnetic in one end far from the opening I
The bottom end of iron, the pole N magnet is connected with one end of buffer spring I, and the cavity II is set in one end far from the opening II
It is equipped with the pole S magnet, the top of the pole S magnet is connected with one end of buffer spring II, the other end of the buffer spring I and institute
The other end for stating buffer spring II is connected with the upper/lower terminal of spiral-tube respectively, the center position of the pole the S magnet upper surface
It is fixedly connected with a borded pile, the one end of the borded pile far from the pole S magnet is worn after passing through out of described buffer spring II
It is located at the inside of the spiral-tube, the longitudinal section of the borded pile is wavy；The pole N is symmetrically arranged on the inner wall of the inner cylinder
Magnetic material and the pole S magnetic material；
The spiral-tube includes inner layer sleeve and outer layer sleeve, and the outer layer sleeve is interior by dowel and the outer cylinder
Wall is connected, and circumferentially arranged between the inner layer sleeve and the outer layer sleeve to have several columns ball, each column ball is equal
Generatrix direction interval along the inner layer sleeve is embedded on the outer wall of the inner layer sleeve, be provided in the inner layer sleeve with
The helical orbit that the borded pile matches, the inner layer sleeve can be turned upward or downward by helical orbit along the borded pile
It is dynamic, it is provided with electromagnet I, the top of the electromagnet I jointly on the upper surface of both the inner layer sleeve and described outer layer sleeve
End is connected with the other end of the buffer spring I, sets jointly on the inner layer sleeve and the lower end surface of both outer layer sleeves
It is equipped with electromagnet II, the bottom end of the electromagnet II is connected with the other end of the buffer spring II, and the inner layer sleeve is leaning on
Nearly described I one end of electromagnet is internally provided at least one stub I, the both ends of the stub I pass through respectively conducting wire with
Two terminals of the electromagnet I are electrically connected, and the inner layer sleeve is in being internally provided with close to described II one end of electromagnet
At least one stub II, two terminals that the both ends of the stub II pass through conducting wire and the electromagnet II respectively are electrically connected
It connects.
Preferably, two poles are serially connected in the series loop formed between the stub I and the electromagnet I by conducting wire
Pipe I, between the stub II and the electromagnet II by conducting wire formed series loop on be serially connected with diode II.
Preferably, the diode I is identical as the VA characteristic curve of the diode II.
Preferably, center of the central axis of II the two of the stub I and the stub with the inner layer sleeve
Axis is parallel.
Preferably, the stub I is located on the same cylindrical surface with the stub II and the two is interspersed.
Preferably, the quantity of the stub I is 5, and 5 stubs I are uniformly distributed circumferentially in the internal layer
The inside of sleeve mutually concatenates after the both ends of 5 stubs I are in parallel with two terminals of the electromagnet I；The conductor
The quantity of stick II is 5, and 5 stubs II are uniformly arranged in the circumferential direction in the inside of the inner layer sleeve, 5 conductors
It is mutually concatenated after the both ends of stick II are in parallel with two terminals of the electromagnet II.
Preferably, circumferentially arranged between the inner layer sleeve and the outer layer sleeve to have a 16 column balls, described in each column
The quantity of ball is 23.
Compared with prior art, the utility model has the beneficial effects that in the utility model used by outer cylinder and inner cylinder
It is close fitting connection type, not only ensure that internal main construction is not done by external environment in whole device operational process
It disturbs, provides good closed environment, and outer tube inner wall and inner tank theca are coated with strong friction material and (gather inclined two chloroethene
Alkene), vibrating object can be hindered to drive the vibration motion of outer cylinder to a certain extent, and then achieve the purpose that slowing down vibration；And
And the spiral-tube in the utility model is class bearing construction, can not be rotated with the outer layer sleeve that outer cylinder is connect by dowel
Movement, and the inner layer sleeve embedded with stub can rotate movement by the borded pile in helical orbit and inner layer sleeve,
And inner cylinder inner wall is provided with the pole N magnetic material and the pole S magnetic material again, and stub may make to do cutting magnetic induction line movement, from
And electric current being generated, and then generate magnetic field in the electromagnet being connected with stub, the vibration that vibrating object is occurred subtracts
It is slow.
Detailed description of the invention
Fig. 1 is the overall structure diagram of the utility model；
Fig. 2 is the structural schematic diagram of spiral-tube in the utility model；
Fig. 3 is the cross-sectional view in the utility model inside inner layer sleeve；
Fig. 4 is the circuit diagram of stub I in the utility model, electromagnet I and the formed series loop of diode I；
Fig. 5 is the circuit diagram of stub II in the utility model, electromagnet II and the formed series loop of diode II；
Marked in the figure: 1, vibrating object, 2, outer cylinder, 3, inner cylinder, 4, spiral-tube, 401, inner layer sleeve, 402, outer layer sleeve,
403, ball, 404, helical orbit, 405, electromagnet I, 406, electromagnet II, 407, stub I, 408, stub II, 409,
Diode I, 410, diode II, 5, bottom plate, 6, cavity I, 7, cavity II, 8, the pole N magnet, 9, the pole S magnet, 10, buffer spring
I, 11, buffer spring II, 12, borded pile, 13, the pole N magnetic material, 14, the pole S magnetic material.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described reality
Applying example is the utility model a part of the embodiment, instead of all the embodiments, based on the embodiments of the present invention, ability
It is practical new to belong to this for domain those of ordinary skill every other embodiment obtained without creative efforts
The range of type protection.
As shown in Figure 1, a kind of transplanting machine vibration slowing device with class bearing structure, the vibration slowing device and vibration
Object 1 be connected, the vibration for vibrating object 1 to be occurred slows down, the vibration slowing device include outer cylinder 2, inner cylinder 3,
Spiral-tube 4 and bottom plate 5, vibrating object 1 are connected with the top of the outer cylinder 2, and the bottom of the inner cylinder 3 is arranged in the bottom plate 5
The inside of end, the outer cylinder 2 and the inner cylinder 3 is respectively arranged with cavity I 6 and cavity II 7, and the outer cylinder 2 is set in described
On the outer wall of cylinder 3 and the outer cylinder 2 can slide on the outer wall of the inner cylinder 3, and outer cylinder is used with inner cylinder in the utility model
Be close fitting connection type, not only ensure that in whole device operational process that internal main construction is not done by external environment
It disturbs, provides good closed environment, and outer tube inner wall and inner tank theca are coated with strong friction material and (gather inclined two chloroethene
Alkene), vibrating object can be hindered to drive the vibration motion of outer cylinder to a certain extent, and then achieve the purpose that slowing down vibration；Institute
It states outer cylinder 2 and offers the opening I being connected with the cavity I 6 in one end far from vibrating object 1, the inner cylinder 3 is far from institute
The one end for stating bottom plate 5 offers the opening II being connected with the cavity II 7, and the cavity I 6 is in one far from the opening I
End is provided with the pole N magnet 8, and the bottom end of the pole N magnet 8 is connected with one end of buffer spring I 10, and the cavity II 7 is separate
One end of the opening II is provided with the pole S magnet 9, it will be recognized by those skilled in the art that the polarity of magnet is individually to deposit
, i.e., the pole electromagnet N, the pole electromagnet S, the pole N magnet 8 and the pole the S magnet 9 occurred herein is used in magnet
The abbreviation of one pole；The top of the pole S magnet 9 is connected with one end of buffer spring II 11, the other end of the buffer spring I 10
It is connected respectively with the upper/lower terminal of spiral-tube 4 with the other end of the buffer spring II 11, in 9 upper surface of the pole S magnet
It is fixedly connected with a borded pile 12 at heart position, the one end of the borded pile 12 far from the pole S magnet 9 is from the buffer spring
The inside of the spiral-tube 4 is threaded through after passing through in II 11, the whole helically type of the borded pile 12 and its longitudinal section are in wave
Shape；The pole N magnetic material 13 and the pole S magnetic material 14, the pole N magnetic material 13 and the pole S are symmetrically arranged on the inner wall of the inner cylinder 3
Magnetic material 14 is covered each by the half inner wall of inner cylinder 3；
As shown in Figures 2 and 3, the spiral-tube 4 includes inner layer sleeve 401 and outer layer sleeve 402, the outer layer sleeve
402 are connected by dowel 15 with the inner wall of the outer cylinder 2, along week between the inner layer sleeve 401 and the outer layer sleeve 402
To several columns ball 403 is provided with, generatrix direction interval of each column ball 403 along the inner layer sleeve 401 is embedded
On the outer wall of the inner layer sleeve 401, the spiral track to match with the borded pile 12 is provided in the inner layer sleeve 401
Road 404, the inner layer sleeve 401 can be rotated upward or downward by helical orbit 404 along the borded pile 12, the internal layer set
It is provided with electromagnet I 405, the top of the electromagnet I 405 jointly on cylinder 401 and the upper surface of both outer layer sleeves 402
It is connected with the other end of the buffer spring I 10, on the lower end surface of 402 the two of the inner layer sleeve 401 and the outer layer sleeve
It is provided with electromagnet II 406 jointly, the bottom end of the electromagnet II 406 is connected with the other end of the buffer spring II 11, institute
It states inner layer sleeve 401 and is being internally provided at least one stub I 407, the conductor close to described I 405 one end of electromagnet
The both ends of stick I 407 pass through conducting wire respectively and are electrically connected with two terminals of the electromagnet I 405, and the inner layer sleeve 401 exists
At least one stub II 408, the both ends of the stub II 408 are internally provided with close to described II 406 one end of electromagnet
It is electrically connected respectively by conducting wire with two terminals of the electromagnet II 406.
This programme is advanced optimized, as shown in figure 4, passing through conducting wire between the stub I 407 and the electromagnet I 405
Diode I 409 is serially connected in the series loop of formation, as shown in figure 5, the stub II 408 and the electromagnet II 406 it
Between by conducting wire formed series loop on be serially connected with diode II 410.
This programme is advanced optimized, the diode I 409 is identical as the VA characteristic curve of the diode II 410.
Advanced optimize this programme, the central axis of the stub I 407 and both stubs II 408 is and institute
State the centerline axis parallel of inner layer sleeve 401.
Advanced optimize this programme, the stub I 407 be located on the same cylindrical surface with the stub II 408 and
The two is interspersed.
This programme is advanced optimized, the quantity of the stub I 407 is 5, and 5 stubs I 407 are circumferentially equal
The even inside for being distributed in the inner layer sleeve, after the both ends of 5 stubs I 407 are in parallel with the electromagnet I 405 two
A terminals mutually concatenate；The quantity of the stub II 408 is 5, and 5 stubs II 408 are uniformly arranged in the circumferential direction
The inside of the inner layer sleeve, two wiring after the both ends of 5 stubs II 408 are in parallel with the electromagnet II 406
End mutually concatenates.
This programme is advanced optimized, it is circumferentially arranged between the inner layer sleeve 401 and the outer layer sleeve 402 to have 16 column
The quantity of ball 403, each column ball 403 is 23.
A kind of oscillation damping method of the transplanting machine vibration slowing device with class bearing structure, includes the following steps,
Step 1: vibrating object 1 is connected with the vibration slowing device, when vibrating object 1 vibrates, slows down the vibration
Device assigns the effect for squeezing and either stretching, and when vibration slowing device is stretched, spiral-tube 4 is moved upwards with outer cylinder 2,
In, outer layer sleeve 402 is synchronized with outer cylinder 2 and is moved upwards, and inner layer sleeve 401 is done along borded pile 12 by helical orbit 404 and revolved
Turn to move upwards, spiral-tube 4 is produced in the pole the N magnetic material 13 and the pole S magnetic material 14 being arranged on 3 inner wall of inner cylinder always
In raw magnetic field, inner layer sleeve 401 is being internally provided at least one stub I 407 close to I 405 one end of electromagnet, leads
Body stick I 407 does cutting magnetic induction line movement while making rotating motion with inner layer sleeve 401, and at the both ends of stub I 407
Generate induced electromotive force；
Step 2: the both ends of stub I 407 pass through conducting wire respectively and are electrically connected with two terminals of electromagnet I 405,
Under the action of induced electromotive force caused by step 1, downward induced current is generated in stub I 407, by presetting conductor
The connection relationship of stick I and I two terminals of electromagnet, so that the top of electromagnet I 405 generates the pole electromagnet N；Outer cylinder 2 it is interior
Portion is provided with cavity I 6, and the pole N magnet 8 is provided in cavity I 6, it will be recognized by those skilled in the art that the polarity of magnet is cannot
Individualism, i.e., the herein presented pole electromagnet N and the pole N magnet 8 are the abbreviation of a pole used in magnet, electromagnet N
Identical charges repel each other with the pole N magnet 8 for pole, hinders to be relatively distant from movement between inner cylinder 3 and outer cylinder 2, reaches and vibrating object 1 is occurred
The purpose that is slowed down of vibration.
When vibration slowing device is extruded, spiral-tube 4 is moved downward with outer cylinder 2, wherein outer layer sleeve 402 is with outer cylinder 2
It synchronizes and moves downward, and inner layer sleeve 401 does rotation along borded pile 12 by helical orbit 404 and moves downward, spiral-tube 4 is always
In the magnetic field caused by the pole the N magnetic material 13 and the pole S magnetic material 14 being arranged on 3 inner wall of inner cylinder, inner layer sleeve
401 are being internally provided at least one stub II 408 close to II 406 one end of electromagnet, and stub II 408 is with internal layer set
Cylinder 401 does cutting magnetic induction line movement while making rotating motion, and generates induced electromotive force at the both ends of stub II 408；It leads
The both ends of body stick II 408 pass through conducting wire respectively and are electrically connected with two terminals of electromagnet II 406, the sense caused by step 1
Under the action of answering electromotive force, upward induced current is generated in stub II 408, passes through default stub II 408 and electromagnet
The connection relationship of II 406 two terminals, so that the bottom end of electromagnet II 406 generates the pole electromagnet S；The inside of outer cylinder 2 is arranged
There is cavity II 7, the pole S magnet 9 is provided in cavity II 7, it will be recognized by those skilled in the art that the polarity of magnet is cannot be independent
Existing, i.e., the herein presented pole electromagnet S and the pole S magnet 9 is the abbreviation of a pole used in magnet, the pole electromagnet S and S
Identical charges repel each other for pole magnet 9, hinders the relatively close movement between inner cylinder 3 and outer cylinder 2, reaches the vibration that vibrating object 1 is occurred
The dynamic purpose slowed down.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (7)
1. a kind of transplanting machine vibration slowing device with class bearing structure, the vibration slowing device are connected with vibrating object, use
Slow down in the vibration that vibrating object is occurred, it is characterised in that: the vibration slowing device includes outer cylinder, inner cylinder, spiral
Cylinder and bottom plate, vibrating object are connected with the top of the outer cylinder, and the bottom end of the inner cylinder, the outer cylinder is arranged in the bottom plate
It is respectively arranged with cavity I and cavity II with the inside of the inner cylinder, the outer cylinder is set on the outer wall of the inner cylinder and described
Outer cylinder can slide on the outer wall of the inner cylinder, and the outer cylinder offers and I phase of cavity in one end far from vibrating object
The opening I of connection, the inner cylinder offers the opening II being connected with the cavity II in one end far from the bottom plate, described
Cavity I is provided with the pole N magnet, the bottom end of the pole N magnet and one end phase of buffer spring I in one end far from the opening I
Even, the cavity II is provided with the pole S magnet, the top of the pole S magnet and buffer spring in one end far from the opening II
II one end is connected, and the other end of the buffer spring I and the other end of the buffer spring II are upper and lower with spiral-tube respectively
Both ends are connected, and the center position of the pole the S magnet upper surface is fixedly connected with a borded pile, and the borded pile is far from the S
One end of pole magnet is threaded through the inside of the spiral-tube, the longitudinal section of the borded pile after passing through out of described buffer spring II
It is wavy；The pole N magnetic material and the pole S magnetic material are symmetrically arranged on the inner wall of the inner cylinder；
The spiral-tube includes inner layer sleeve and outer layer sleeve, and the outer layer sleeve passes through the inner wall phase of dowel and the outer cylinder
Even, circumferentially arranged between the inner layer sleeve and the outer layer sleeve to have several columns ball, each column ball is along institute
The generatrix direction interval for stating inner layer sleeve is embedded on the outer wall of the inner layer sleeve, be provided in the inner layer sleeve with it is described
The helical orbit that borded pile matches, the inner layer sleeve can be rotated upward or downward by helical orbit along the borded pile,
Be provided with electromagnet I on the upper surface of both the inner layer sleeve and the outer layer sleeve jointly, the top of the electromagnet I with
The other end of the buffer spring I is connected, and is provided with jointly on the inner layer sleeve and the lower end surface of both outer layer sleeves
Electromagnet II, the bottom end of the electromagnet II are connected with the other end of the buffer spring II, and the inner layer sleeve is close to institute
State at least one stub I that is internally provided with of I one end of electromagnet, the both ends of the stub I pass through respectively conducting wire with it is described
Two terminals of electromagnet I are electrically connected, and the inner layer sleeve is in being internally provided at least close to described II one end of electromagnet
One stub II, the both ends of the stub II pass through conducting wire respectively and are electrically connected with two terminals of the electromagnet II.
2. a kind of transplanting machine vibration slowing device with class bearing structure according to claim 1, it is characterised in that: institute
It states and is serially connected with diode I, the stub II in the series loop formed between stub I and the electromagnet I by conducting wire
Diode II is serially connected in the series loop formed between the electromagnet II by conducting wire.
3. a kind of transplanting machine vibration slowing device with class bearing structure according to claim 2, it is characterised in that: institute
It is identical as the VA characteristic curve of the diode II to state diode I.
4. a kind of transplanting machine vibration slowing device with class bearing structure according to claim 1, it is characterised in that: institute
State centerline axis parallel of the central axis of both stub I and the stub II with the inner layer sleeve.
5. a kind of transplanting machine vibration slowing device with class bearing structure according to claim 4, it is characterised in that: institute
State that stub I is located on the same cylindrical surface with the stub II and the two is interspersed.
6. a kind of transplanting machine vibration slowing device with class bearing structure according to claim 5, it is characterised in that: institute
The quantity for stating stub I is 5, and 5 stubs I are uniformly distributed circumferentially in the inside of the inner layer sleeve, described in 5
It is mutually concatenated after the both ends of stub I are in parallel with two terminals of the electromagnet I；The quantity of the stub II be 5,5
A stub II is uniformly arranged in the circumferential direction in the inside of the inner layer sleeve, after the both ends of 5 stubs II are in parallel
It is mutually concatenated with two terminals of the electromagnet II.
7. a kind of transplanting machine vibration slowing device with class bearing structure according to claim 1, it is characterised in that: institute
State it is circumferentially arranged between inner layer sleeve and the outer layer sleeve have a 16 column balls, the quantity of each column ball is 23
It is a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820462364.5U CN208331097U (en) | 2018-04-03 | 2018-04-03 | A kind of transplanting machine vibration slowing device with class bearing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820462364.5U CN208331097U (en) | 2018-04-03 | 2018-04-03 | A kind of transplanting machine vibration slowing device with class bearing structure |
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| Publication Number | Publication Date |
|---|---|
| CN208331097U true CN208331097U (en) | 2019-01-04 |
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ID=64780228
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820462364.5U Expired - Fee Related CN208331097U (en) | 2018-04-03 | 2018-04-03 | A kind of transplanting machine vibration slowing device with class bearing structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108412944A (en) * | 2018-04-03 | 2018-08-17 | 河南科技大学 | A kind of electromagnetic vibration slowing device and its oscillation damping method |
-
2018
- 2018-04-03 CN CN201820462364.5U patent/CN208331097U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108412944A (en) * | 2018-04-03 | 2018-08-17 | 河南科技大学 | A kind of electromagnetic vibration slowing device and its oscillation damping method |
| CN108412944B (en) * | 2018-04-03 | 2023-11-03 | 河南科技大学 | Electromagnetic vibration damping device and vibration damping method thereof |
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