CN208001508U - A kind of vegetable transplanting machine shock mitigation system - Google Patents
A kind of vegetable transplanting machine shock mitigation system Download PDFInfo
- Publication number
- CN208001508U CN208001508U CN201820101087.5U CN201820101087U CN208001508U CN 208001508 U CN208001508 U CN 208001508U CN 201820101087 U CN201820101087 U CN 201820101087U CN 208001508 U CN208001508 U CN 208001508U
- Authority
- CN
- China
- Prior art keywords
- cylinder body
- transplanting machine
- vegetable transplanting
- mitigation system
- shock mitigation
- Prior art date
- 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.)
- Expired - Fee Related
Links
Landscapes
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
The utility model provides a kind of vegetable transplanting machine shock mitigation system,Characteristic of the utility model based on STF and ultrasonic wave,The vibration of liquid medium is propagated and caused in shear thickening liquid using ultrasonic wave,So that liquid consistency increases,Hardness increases,To give piston sufficiently large reaction force,Achieve the effect that damping,Simultaneously,Displacement sensor is utilized in the utility model,Operational amplifier,Sampling holder,The combination of A/D conversions etc.,The size of suffered impact force is reacted using the change in displacement between damping device upper and lower support plate,To voltage signal output,It is changed into corresponding current values of each moment again,It is finally converted to the ultrasonic wave of respective frequencies,Ultrasonic frequency is different,The hard tough degree of shear thickening liquid is also different,Reaction force also can be different,Accurately realize that impact force is corresponded with reaction force.
Description
Technical field
The utility model belongs to agricultural machinery technological field, and in particular to a kind of vegetable transplanting machine shock mitigation system.
Background technology
Vibration will necessarily give machinery even operator itself to bring huge harm to mechanical implement for a long time.Due to vibration
Presence, greatly reduce the dynamic accuracy and performance of vegetable transplanting machine, while the vibration of machinery will produce and become repeatedly
Dynamic load will necessarily reduce the service life of vegetable transplanting machine for a long time, in addition it is serious when can cause the calamity for being difficult to make up
Difficult matter event.The harm that worse vibration is brought to the person and environment.Such as long-time contact vibration source can make one to generate and shake
Dynamic disease, aggravates the damage of human organ.And noise pollution caused by vibration is even more very important, gently can then make mechanical behaviour
Author generates of short duration tinnitus phenomenon, and the physiology and psychology to people bring harm, heavy then cause traffic accident, environmental pollution.Cause
This, reduces or remits very urgent with the vibration of radical cure machinery.
Shear thickening liquid is audaciously quoted in the utility model innovation（STF）, when using it by unexpected outer force effect, energy
Enough principle for becoming hard objects by transient liquid, to reach the function and effect of good damping.It is to subtract about STF below
The specific manifestation of shake mechanism.
Utility model content
The purpose of this utility model is to provide a kind of vegetable transplanting machine shock mitigation system, and the utility model is based on STF and surpasses
The characteristic of sound wave, propagates in shear thickening liquid and causes the vibration of liquid medium using ultrasonic wave so that liquid consistency increases
Add, hardness increases, and to give piston sufficiently large reaction force, achievees the effect that damping, to solve the above technical problems.
In order to achieve the above object, the used technical solution of the utility model is：A kind of vegetable transplanting machine damping
System, which is mounted on vegetable transplanting machine carries out damping to vegetable transplanting machine, which includes cylinder body and set
The ultrasonic transducer in cylinder interior is set, the bottom of the cylinder body is connected with lower supporting plate, and being provided in the cylinder body can be
The piston slided up and down in the cylinder body, the piston rod of the piston is pierced by out of described cylinder body to be connected with upper backup pad afterwards, institute
Upper backup pad is stated on vegetable transplanting machine, the inner cavity of the cylinder body is divided into epicoele and cavity of resorption, the work by the piston
Piston rod one end setting of plug is pierced by rear and upper branch in the upper intracavitary, the piston rod other end of the piston out of described cylinder body
Fagging is connected, and the lower intracavitary is filled with shear thickening liquid, and the lower intracavitary is provided with ultrasonic transducer, the ultrasonic wave
Energy converter is mounted on the inner wall of the cylinder base；Being correspondingly arranged on the upper backup pad and the lower supporting plate can be by institute
The displacement for stating upper backup pad is converted into the displacement sensor of voltage signal, is provided on the lower supporting plate displacement sensor is defeated
The operational amplifier that the voltage signal gone out is amplified is provided with and can convert amplified voltage signal on the upper backup pad
At the sampling holder of DC signal, the DC signal that sampling holder can be exported is additionally provided on the lower supporting plate
Be converted to the supersonic generator of the ac signal to match with ultrasonic transducer.
Preferably, the lower intracavitary is provided with the protection spring for protecting the ultrasonic transducer.
Preferably, the protection spring is mounted on the inner wall of the cylinder base, the protection spring and the ultrasound
The central axis of both wave transducers overlaps.
Preferably, the cylinder body includes the lower cylinder body in column type and the lid that is connected with the top of lower cylinder body, under described
The bottom of cylinder body is connected with the lower supporting plate, and the ultrasonic transducer is mounted on the centre bit of the lower cylinder body bottom interior wall
Set place.
Preferably, the cross section of the lid is arc-shaped and the intrados of the lid cross section is towards the lower cylinder body.
Preferably, the center position of the lid offers through-hole, and the piston rod of the piston is worn out of described through-hole
It is connected with upper backup pad after going out.
Preferably, the operational amplifier is internally provided with operational amplification circuit.
Preferably, the operational amplification circuit is TLC2252 operational amplification circuits.
Preferably, the sampling holder is internally provided with sampling hold circuit, and the sampling hold circuit includes slow
Rush amplifier N1, analog switch S, holding capacitor C and buffer amplifier N2, the inverting input of the buffer amplifier N1
It is connected with its output end, the in-phase input end of the buffer amplifier N1 is connected with the output end of the operational amplification circuit, institute
The output end for stating buffer amplifier N1 is connected by analog switch S with the in-phase input end of buffer amplifier N2, and the buffering is put
The inverting input of big device N2 is connected with its output end, and the output end of the buffer amplifier N2 is connected with ultrasonic transducer,
The in-phase input end of the buffer amplifier N2 is connected by holding capacitor C with zero potential point.
A kind of shock-dampening method of vegetable transplanting machine shock mitigation system, includes the following steps,
Step 1：Vegetable transplanting machine vibrates after being impacted, upper backup pad and piston with vegetable transplanting machine vibration, on
Displacement sensor is correspondingly arranged in support plate and lower supporting plate, displacement sensor is detected the displacement of upper backup pad, and
The displacement signal detected is converted into voltage signal；
Step 2：Displacement sensor sends the voltage signal of output to operational amplifier, and operational amplifier passes displacement
The voltage signal of sensor output is amplified；
Step 3：Operational amplifier sends amplified voltage signal to sampling holder, and sampling holder acquisition is put
Then voltage signal after big carries out A/D conversions in every flashy average voltage again, and being formed after A/D is converted
Analog voltage signal is converted into DC signal；
Step 4：Sampling holder sends DC signal to supersonic generator, and supersonic generator is by direct current
Signal is converted into the ac signal to match with ultrasonic transducer；
Step 5：Supersonic generator sends ac signal to ultrasonic transducer, and ultrasonic transducer is receiving
It starts to work after to ac signal and output ultrasonic wave, ultrasonic wave is propagated in shear thickening liquid so that shear thickening liquid
Body consistency increases, and hardness increases, and to apply a upward reaction force to the piston moved downward, reaches the effect of damping
Fruit.
Compared with prior art, the utility model has the beneficial effects that：
1. shear thickening liquid is rapid by impact using shear thickening liquid as damping beaer in the utility model
Become tough, impact force disappearance and at once restorable characteristic so that shock mitigation system is by different impact forces to give phase
Corresponding reaction force, reaction force can make corresponding adjustment with the variation of the impact force of vibration, so that subtracting
Shaking effect can be more preferable；
2. shear thickening liquid is made of polyethylene glycol and silicon particle in the utility model, polyethylene glycol is a kind of application
Extensive non-toxic aq, the temperature range that can be born are very wide.The machinery of conventional apparatus is not only avoided using this new material
Friction, is reduced noise pollution, extends service life, and can be generated larger reaction with the liquid medium of smaller size smaller
Power reduces the volume and quality of device so that damping device is more environment friendly and pollution-free；
3. the utility model controls voltage with displacement sensor, conventional apparatus is changed to change the side that resistance controls electric current
Formula avoids the manual regulation and control of potentiometer in conventional apparatus, realizes intelligent automatic regulation and control, and simplify mechanical device, and just
It is repaired in production；
4. organic knot of displacement sensor, operational amplifier, sampling holder, A/D conversions etc. is utilized in the utility model
It closes, the size of suffered impact force is reacted using the change in displacement between damping device upper and lower support plate, to defeated with voltage signal
Going out, then be changed into corresponding current values of each moment, is finally converted to the ultrasonic wave of respective frequencies, ultrasonic frequency is different,
The hard tough degree of shear thickening liquid is also different, and reaction force also can be different, accurately realizes impact force with reaction force one by one
It is corresponding.
Description of the drawings
Fig. 1 is the overall structure diagram of the utility model；
Fig. 2 is the schematic cross-sectional view of the utility model；
Fig. 3 is the structural schematic diagram of cylinder body in the utility model；
Fig. 4 is the structural schematic diagram of ultrasonic transducer in the utility model；
Fig. 5 is the structural schematic diagram that spring is protected in the utility model；
Fig. 6 is the structural schematic diagram of sampling hold circuit in the utility model；
Fig. 7 is the structural schematic diagram of operational amplification circuit in the utility model；
It is marked in figure：1, displacement sensor, 2, upper backup pad, 3, sampling holder, 4, operational amplifier, 5, lower support
Plate, 6, supersonic generator, 7, cylinder body, 8, lid, 9, piston, 10, ultrasonic transducer, 11, protection spring, 12, epicoele,
13, cavity of resorption, 14, lower cylinder body.
Specific implementation mode
The shear thickening liquid used in the utility model（Shear Thickening Fluid）(STF) it is freely hanged in
Many special particles are floated, when liquid is disturbed because of severe impact, special particle therein mutually collides, shear thickening
Liquid will retrogradation, hardness gradually increases, and forms the resistance to this agitation.Impact force suffered by liquid disappears
When, liquid can restore to the original state rapidly.Ultrasonic wave can make the particle oscillation in elastic fluid when being propagated by elastic fluid, and pass through
Medium transmits energy by the direction of propagation of ultrasonic wave, acceleration and the ultrasonic frequency of particle oscillation it is square directly proportional.It is based on
The characteristic of this shear thickening liquid and ultrasonic wave, is propagated in shear thickening liquid using ultrasonic wave and causes liquid medium
Vibration so that liquid consistency increases, and hardness increases, and to give piston sufficiently large reaction force, achievees the effect that damping, below
The technical solution of the utility model is described in detail in conjunction with attached drawing：
As depicted in figs. 1 and 2, a kind of vegetable transplanting machine shock mitigation system, the shock mitigation system are mounted on vegetable transplanting machine
Damping is carried out to vegetable transplanting machine, which includes cylinder body 7 and the ultrasonic transducer 10 in cylinder interior is arranged, described
The bottom of cylinder body 7 is connected with lower supporting plate 5, and the piston 9 that can be slided up and down in the cylinder body, institute are provided in the cylinder body 7
State piston 9 piston rod be pierced by out of the cylinder body 7 after be connected with upper backup pad 2, the upper backup pad 2 is mounted on vegetable transplanting
On machine, the inner cavity of the cylinder body 7 is divided into epicoele 12 and cavity of resorption 13, piston rod one end setting of the piston 9 by the piston 9
In the epicoele 12, the piston rod other end of the piston 9 is pierced by out of the cylinder body 7 to be connected with upper backup pad 2 afterwards, described
It is filled with shear thickening liquid in cavity of resorption 13, ultrasonic transducer 10, the ultrasonic transducer are provided in the cavity of resorption 13
10 are mounted on the inner wall of 7 bottom of the cylinder body；Being correspondingly arranged on the upper backup pad 2 and the lower supporting plate 5 can be by institute
The displacement for stating upper backup pad 2 is converted into the displacement sensor 1 of voltage signal, is provided on the lower supporting plate 5 and passes displacement
The operational amplifier 4 that is amplified of voltage signal that sensor 1 exports, being provided on the upper backup pad 2 can be by amplified electricity
Pressure signal is converted into the sampling holder 3 of DC signal, is additionally provided on the lower supporting plate 5 and can export sampling holder
DC signal be converted to the supersonic generator 6 of the ac signal to match with ultrasonic transducer 10.
This programme is advanced optimized, the protection bullet for protecting the ultrasonic transducer 10 is provided in the cavity of resorption 13
Spring 11.
This programme is advanced optimized, the protection spring 11 is mounted on the inner wall of 7 bottom of the cylinder body, the protection bullet
Spring 11 is overlapped with the central axis of both ultrasonic transducers 10.
Advanced optimize this programme, as shown in figure 3, the cylinder body 7 include in column type lower cylinder body 14 and with lower cylinder body 14
The lid 8 that is connected of top, the bottom of the lower cylinder body 14 is connected with the lower supporting plate 5, the ultrasonic transducer 10
Mounted on the center position of 14 bottom interior wall of the lower cylinder body.
Advanced optimize this programme, the cross section of the lid 8 is arc-shaped and the intrados direction of 8 cross section of lid
The lower cylinder body 14.
Advanced optimize this programme, the center position of the lid 8 offers through-hole, the piston rod of the piston 9 from
It is connected with upper backup pad 2 after being pierced by the through-hole.
This programme is advanced optimized, the operational amplifier 4 is internally provided with operational amplification circuit, the operation amplifier
Circuit is TLC2252 operational amplification circuits；As shown in fig. 7, operational amplification circuit herein includes that triode T, base stage are electric over the ground
Pressure, collector voltage-to-ground, first resistor, second resistanceAnd input voltage Ui, input voltage Ui
Both ends be sequentially connected in series first resistor, the base stage of triode T, the emitter of triode T and base stage voltage-to-groundIt is connected；The collector of triode T successively with second resistance, collector voltage-to-groundBe connected rear and triode T
Emitter be connected, wherein input voltage Ui is the voltage signal of displacement sensor output, the emitter of triode T and zero electric
Gesture point is connected, and the potential difference between the collector and emitter of triode T is output voltage。
This programme is advanced optimized, the sampling holder 3 is internally provided with sampling hold circuit, as shown in fig. 6, institute
It includes buffer amplifier N1, analog switch S, holding capacitor C and buffer amplifier N2, the buffering to state sampling hold circuit
The inverting input of amplifier N1 is connected with its output end, in-phase input end and the operation amplifier of the buffer amplifier N1
The output end of circuit is connected, and the output end of the buffer amplifier N1 passes through the same mutually defeated of analog switch S and buffer amplifier N2
Enter end to be connected, the inverting input of the buffer amplifier N2 is connected with its output end, the output end of the buffer amplifier N2
It is connected with ultrasonic transducer, the in-phase input end of the buffer amplifier N2 is connected by holding capacitor C with zero potential point.
A kind of shock-dampening method of vegetable transplanting machine shock mitigation system, includes the following steps,
Step 1：Vegetable transplanting machine vibrates after being impacted, upper backup pad and piston with vegetable transplanting machine vibration, on
Displacement sensor is correspondingly arranged in support plate and lower supporting plate, displacement sensor is detected the displacement of upper backup pad, and
The displacement signal detected is converted into voltage signal；
Step 2：Because the voltage signal of displacement sensor output is very faint, therefore displacement sensor believes the voltage of output
Number send operational amplifier to, the voltage signal that displacement sensor exports is amplified by operational amplifier；By the faint of input
Voltage signal is amplified to required range value and consistent with original input signal changing rule；
Step 3：Operational amplifier sends amplified voltage signal to sampling holder, and sampling holder acquisition is put
Then voltage signal after big carries out A/D conversions in every flashy average voltage again, and being formed after A/D is converted
Analog voltage signal is converted into DC signal；
Step 4：Sampling holder sends DC signal to supersonic generator, and supersonic generator is by direct current
Signal is converted into the ac signal to match with ultrasonic transducer；
Step 5：Supersonic generator sends ac signal to ultrasonic transducer, and ultrasonic transducer is receiving
It starts to work after to ac signal, changes the electrical power of input into mechanical output（That is ultrasonic wave）, ultrasonic wave is in shear thickening
It is propagated in liquid so that shear thickening liquid consistency increases, and the vibration of liquid medium, hardness is caused to increase, to fortune downwards
Dynamic piston applies a upward reaction force, achievees the effect that damping；Herein it should be noted that ultrasonic transducer connects
The current value of the ac signal of the different moments output received is different, to send out the ultrasonic wave of different frequency, shear thickening
The consistency and hardness of liquid also can ceaselessly change, and different size of reaction force is given to adapt to different degrees of vibration, this
Sample damping effect can greatly improve；Herein it should be noted that particle vibrates in liquid acceleration and ultrasonic frequency it is flat
Side is directly proportional, i.e., the displacement that displacement sensor detects is bigger, then electric current is bigger, the ultrasonic frequency that ultrasonic transducer is sent out
Higher, the acceleration that particle vibrates in liquid is bigger, and the consistency and hardness of shear thickening liquid are higher, to shear thickening liquid
The reaction force applied to piston is also bigger, and damping effect is also better.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use this practicality new
Type.Various modifications to these embodiments will be 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 utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest range consistent with features of novelty.
Claims (9)
1. a kind of vegetable transplanting machine shock mitigation system, which, which is mounted on vegetable transplanting machine, subtracts vegetable transplanting machine
Shake, the shock mitigation system include cylinder body and the ultrasonic transducer in cylinder interior are arranged, it is characterised in that：The bottom of the cylinder body
It is connected with lower supporting plate, the piston that can be slided up and down in the cylinder body, the piston rod of the piston is provided in the cylinder body
It is connected with upper backup pad after being pierced by out of described cylinder body, the upper backup pad is on vegetable transplanting machine, and the piston is by institute
The inner cavity for stating cylinder body is divided into epicoele and cavity of resorption, and piston rod one end of the piston is arranged in the upper intracavitary, the piston
The piston rod other end is connected after being pierced by out of described cylinder body with upper backup pad, and the lower intracavitary is filled with shear thickening liquid, institute
It states lower intracavitary and is provided with ultrasonic transducer, the ultrasonic transducer is mounted on the inner wall of the cylinder base；On described
The displacement of the upper backup pad can be converted into the displacement biography of voltage signal by being correspondingly arranged in support plate and the lower supporting plate
Sensor is provided with the operational amplifier for being amplified the voltage signal that displacement sensor exports on the lower supporting plate, described
Amplified voltage signal can be converted into the sampling holder of DC signal, the lower supporting plate by being provided on upper backup pad
On be additionally provided with the DC signal that sampling holder exports can be converted to and exchange telecommunications with what ultrasonic transducer matched
Number supersonic generator.
2. a kind of vegetable transplanting machine shock mitigation system according to claim 1, it is characterised in that：The lower intracavitary is provided with
Protection spring for protecting the ultrasonic transducer.
3. a kind of vegetable transplanting machine shock mitigation system according to claim 2, it is characterised in that：The protection spring installation
On the inner wall of the cylinder base, the protection spring is overlapped with the central axis of both ultrasonic transducers.
4. a kind of vegetable transplanting machine shock mitigation system according to claim 1, it is characterised in that：The cylinder body includes in column
The lower cylinder body of type and the lid being connected with the top of lower cylinder body, the bottom of the lower cylinder body are connected with the lower supporting plate, institute
State the center position that ultrasonic transducer is mounted on the lower cylinder body bottom interior wall.
5. a kind of vegetable transplanting machine shock mitigation system according to claim 4, it is characterised in that：The cross section of the lid
The intrados of arc-shaped and described lid cross section is towards the lower cylinder body.
6. a kind of vegetable transplanting machine shock mitigation system according to claim 5, it is characterised in that：The centre bit of the lid
The place of setting offers through-hole, and the piston rod of the piston is pierced by out of described through-hole to be connected with upper backup pad afterwards.
7. a kind of vegetable transplanting machine shock mitigation system according to claim 1, it is characterised in that：The operational amplifier
It is internally provided with operational amplification circuit.
8. a kind of vegetable transplanting machine shock mitigation system according to claim 7, it is characterised in that：The operational amplification circuit
For TLC2252 operational amplification circuits.
9. a kind of vegetable transplanting machine shock mitigation system according to claim 1, it is characterised in that：The sampling holder
Be internally provided with sampling hold circuit, the sampling hold circuit include buffer amplifier N1, analog switch S, holding capacitor C with
And buffer amplifier N2, the inverting input of the buffer amplifier N1 are connected with its output end, the buffer amplifier N1's
In-phase input end is connected with the output end of operational amplification circuit, the output end of the buffer amplifier N1 by analog switch S with
The in-phase input end of buffer amplifier N2 is connected, and the inverting input of the buffer amplifier N2 is connected with its output end, described
The output end of buffer amplifier N2 is connected with ultrasonic transducer, and the in-phase input end of the buffer amplifier N2 is by keeping electricity
Hold C with zero potential point to be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820101087.5U CN208001508U (en) | 2018-01-22 | 2018-01-22 | A kind of vegetable transplanting machine shock mitigation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820101087.5U CN208001508U (en) | 2018-01-22 | 2018-01-22 | A kind of vegetable transplanting machine shock mitigation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208001508U true CN208001508U (en) | 2018-10-26 |
Family
ID=63884194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820101087.5U Expired - Fee Related CN208001508U (en) | 2018-01-22 | 2018-01-22 | A kind of vegetable transplanting machine shock mitigation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208001508U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108040556A (en) * | 2018-01-22 | 2018-05-18 | 河南科技大学 | A kind of vegetable transplanting machine shock mitigation system and shock-dampening method based on STF and ultrasonic wave |
-
2018
- 2018-01-22 CN CN201820101087.5U patent/CN208001508U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108040556A (en) * | 2018-01-22 | 2018-05-18 | 河南科技大学 | A kind of vegetable transplanting machine shock mitigation system and shock-dampening method based on STF and ultrasonic wave |
| CN108040556B (en) * | 2018-01-22 | 2024-01-26 | 河南科技大学 | Vegetable transplanting machine damping system and damping method based on STF and ultrasonic waves |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Yuan et al. | Nonlinear dynamics of a circular piezoelectric plate for vibratory energy harvesting | |
| CN208001508U (en) | A kind of vegetable transplanting machine shock mitigation system | |
| CN207531031U (en) | A kind of earphone winding displacement pressurizer | |
| CN103470737A (en) | Intelligent damping equipment of wind power gear box | |
| NO891924L (en) | DEVICES FOR AA MUTE VIBRATIONS IN BARDUNES. | |
| CN201754114U (en) | Absolute pressure sensor with low bandwidth voltage output range | |
| CN108040556A (en) | A kind of vegetable transplanting machine shock mitigation system and shock-dampening method based on STF and ultrasonic wave | |
| WO2011050697A1 (en) | Sound wave energy storage device and product with same | |
| CN102929132B (en) | Based on the vibration noncontact Active Control Method of multi-disc combination drive configuration | |
| CN110297012A (en) | A kind of detection system and its method of combustible dust cloud cluster dispersion ability fuming-off temperature | |
| CN210086542U (en) | Energy dissipation shock absorber based on piezoelectric ceramic friction | |
| CN207438053U (en) | For the mounting bracket of signal projector | |
| CN208926796U (en) | A kind of noise reduction earflap of self power generation | |
| Kadau et al. | A micromechanical model of collapsing quicksand | |
| CN205209628U (en) | Outdoor wireless ambient noise monitoring system | |
| CN2387671Y (en) | Crops growth promoter | |
| CN218818988U (en) | Active noise reduction device | |
| CN207603479U (en) | A kind of vibrational energy collector | |
| CN208888076U (en) | Bus fatigue experimental device based on hydraulic vibration gen | |
| CN212361465U (en) | Noise detection frame | |
| CN206907475U (en) | A kind of ultrasonic wave blimp | |
| CN214154780U (en) | Digital wireless microphone device | |
| CN201473259U (en) | Portable adjustable lifting jack | |
| CN213648723U (en) | Ultrasonic welding device based on acoustic feedback detection technology | |
| CN211814592U (en) | Device for eliminating residual stress by adopting high-frequency impact vibration |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181026 Termination date: 20190122 |