CN108274108B - The device and its working method of electromagnetic pulse welding metal rubber damping sandwich tube - Google Patents
The device and its working method of electromagnetic pulse welding metal rubber damping sandwich tube Download PDFInfo
- Publication number
- CN108274108B CN108274108B CN201810340359.1A CN201810340359A CN108274108B CN 108274108 B CN108274108 B CN 108274108B CN 201810340359 A CN201810340359 A CN 201810340359A CN 108274108 B CN108274108 B CN 108274108B
- Authority
- CN
- China
- Prior art keywords
- electromagnetic pulse
- pulse module
- loop coil
- metal
- module
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K13/00—Welding by high-frequency current heating
- B23K13/01—Welding by high-frequency current heating by induction heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K13/00—Welding by high-frequency current heating
- B23K13/08—Electric supply or control circuits therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The present invention relates to the devices and its working method of a kind of electromagnetic pulse welding metal rubber damping sandwich tube, the device includes the first electromagnetic pulse module and the second electromagnetic pulse module, first electromagnetic pulse module and the second electromagnetic pulse module include AC power source, transformer, capacitor group, high-voltage switch gear and loop coil, the armature winding input terminal of the input terminal connection transformer of the AC power source, is connected in parallel on the secondary windings output end of transformer after the high-voltage switch gear and loop coil series connection together with capacitor group.Compared with prior art, the present invention completes welding using electromagnetic pulse welding technique, has many advantages, such as certain meaning for the research of the vibration damping and energy-absorbing shock resistance of complex environment lower pipeline system, small, bonding area is big, welding is reliable, safe operation, energy conservation and environmental protection with destroying to base tube.
Description
Technical field
The present invention relates to new metallic material welding technology fields, more particularly, to a kind of electromagnetic pulse welding metal rubber
Damp the device and its working method of sandwich tube.
Background technique
With the development of the industrial technologies such as aerospace, navigation chemical industry and nuclear energy equipment, traditional rubber material is difficult to full
Technical requirements under the complex environments such as sufficient high/low temperature, big load impact.And novel metal rubber material comes into being, and can satisfy
The special requirement of aerospace, spacecraft and civilian goods operating condition solves high temperature, low temperature, high pressure, high vacuum and high vibration etc.
The problems such as damping, vibration damping, filtering under environment, sealing, throttling, heat transfer.In practical applications often can using metal-rubber as
Damping layer has reduced vibration and impact to arrange, but the limitation of its cavernous characteristic and extreme condition is brought centainly to connection
Difficulty, especially on pipeline.
In view of the extreme condition of application, the metal-rubber applied in sandwich tube is only covered around base tube at present
It one layer of lid, is then fixed.Though the method for cladding metal-rubber can guarantee the reliability application under extreme condition outside base tube,
But it equally exists biggish shortcomings and deficiencies:
1) it to be covered with a large amount of metal-rubbers when base tube is very long or thick, guarantee the spreadability of base tube outer wall, then
Need a large amount of material to be fixed, project amount is big, waste of resource and occur it is inconvenient the problems such as.
2) it needs to select when different metal rubber is covered base tube outer wall due to the particularity of the preparation process of metal-rubber
Different fixed models is selected, then influences the design of its model.
3) structure of fixed model and the material of selection cause the intrinsic frequency of base tube structure, the distribution situation of power flow
It influences, it is very big on test data influence, while inconvenience is dismantled, best effectiveness in vibration suppression is also not achieved.
4) under complex environment (the high radiation environment of temperature, high pressure, burn into), the vibration damping and puncture of pipe-line system cannot be very
Good embodiment.
Summary of the invention
The object of the invention is in order to overcome above-mentioned metal-rubber in the prior art damping sandwich Pipe joining method to base
The problems such as influence of the performance of pipe, inconvenient processing and defect and a kind of electromagnetic pulse welding metal rubber damping sandwich tube is provided
Device and its working method are completed to weld using electromagnetic pulse welding technique, and the vibration damping of complex environment lower pipeline system is inhaled
Can the research of shock resistance there is certain meaning, have and destroy that small, bonding area is big, welding is reliable, operation is pacified to base tube
Entirely, the advantages that energy conservation and environmental protection.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of device of electromagnetic pulse welding metal rubber damping sandwich tube, including the first electromagnetic pulse module and the second electricity
Magnetic field impulse module, first electromagnetic pulse module and the second electromagnetic pulse module include AC power source, transformer, capacitor
Group, high-voltage switch gear and loop coil, the armature winding input terminal of the input terminal connection transformer of the AC power source, the high pressure
It is connected in parallel on together with capacitor group on the secondary windings output end of transformer after switch and loop coil series connection, the first electromagnetic pulse
The capacitance of the capacitor group of module is greater than the capacitance of the capacitor group of the second electromagnetic pulse module, the first electromagnetic pulse module
The internal diameter of loop coil be greater than the outer diameter of metal-rubber pipe, the outer diameter of the loop coil of the second electromagnetic pulse module is less than base tube
Internal diameter.
The high-voltage switch gear controls on-off by impulse generator.
A kind of working method of the device of electromagnetic pulse welding metal rubber damping sandwich tube, comprising the following steps:
1) metal-rubber pipe sleeve is located on base tube, the loop coil of the first electromagnetic pulse module is set in metal-rubber pipe
Outside, in the loop coil insertion base tube of the second electromagnetic pulse module；
2) after the AC power source of the first electromagnetic pulse module and the second electromagnetic pulse module charges to capacitor group simultaneously, together
When connect the high-voltage switch gear of the first electromagnetic pulse module and the second electromagnetic pulse module, the first electromagnetic pulse module and the second electromagnetism
Electric current is generated in the loop coil of pulse module, in the loop coil of the first electromagnetic pulse module and the second electromagnetic pulse module
Current direction is on the contrary, and current values are greater than the annular of the second electromagnetic pulse module in the loop coil of the first electromagnetic pulse module
Current values in coil；
Under the action of the first electromagnetic pulse module and the second electromagnetic pulse module, metal-rubber pipe and base tube is made to generate phase
The magnetic force of suction and the welding that closely fits.
The thickness D of the metal-rubber pipe1With the thickness D of base tube2Meet following formula: 2D2>D1>D2。
Compared with prior art, the device of electromagnetic pulse welding metal rubber damping sandwich tube of the present invention is to traditional
On the basis of pipeline welding optimizes, the novel fixing device of a kind of the metal-rubber damper tube and base tube of proposition, tool
It has the advantage that
1) metal-rubber can be applied to largely in pipe-line system, and vibration damping and shock resistance better effect remove fixed model,
It is simple and easy, safety.
2) cooperate base tube, facilitate the design and preparation of metal-rubber pipe, can application range it is wider, no longer by the limit of base tube
System, two weldment structures and performance allow difference big, keep original performance of material, embody metal excellent inherent characteristic and rubber
The high resiliency of glue, big damping characteristic.
3) energy between metal-rubber pipe and base tube easily accurately controls, and repeatability is, it can be achieved that mechanization and automatic metaplasia
Produce equipment.
4) load of metal-rubber pipe is presented non-linear with deformation relationship, that is, rigidity decrescence effect occurs, can be reduced entire
" intrinsic frequency " in system space direction.Simultaneously can be with the increase of external excitation magnitude, " intrinsic frequency " reduces, have it is good every
Vibration effect.
5) have a wide range of application, purposes: aerospace, shipping industry, machinery industry, need to be in high/low temperature or strong in car industry
The structural device of the extreme environments work such as radiation, corrosion can complete electromagnetic pulse welding metal rubber by device through the invention
Sandwich tube is damped, to realize the vibration damping and energy-absorbing shock resistance of pipe-line system and reduce noise.
Detailed description of the invention
Fig. 1 is the schematic diagram of the device of electromagnetic pulse welding metal rubber damping sandwich tube；
Fig. 2 is the top view of electromagnetic pulse welding metal rubber damping sandwich tube portion；
Fig. 3 is that electromagnetic pulse welds schematic diagram；
Fig. 4 is electromagnetic pulse welding contact schematic diagram.
In figure, the 11, first AC power source, the 12, first transformer, 13, first capacitor device group, the 14, first high-voltage switch gear,
15, first annular coil, the 21, second AC power source, the 22, second transformer, the 23, second capacitor group, the 24, second height press off
It closes, the 25, second loop coil, 3, metal-rubber pipe, 4, base tube.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
As shown in Figure 1, a kind of device of electromagnetic pulse welding metal rubber damping sandwich tube includes the first electromagnetic pulse mould
Block and the second electromagnetic pulse module, the first electromagnetic pulse module include the first AC power source 11, the first transformer 12, first capacitor
The input terminal of device group 13, the first high-voltage switch gear 14 and first annular coil 15, the first AC power source 11 connects the first transformer 12
Armature winding input terminal, the first high-voltage switch gear 14 and first annular coil 15 are in parallel together with first capacitor device group 13 after connecting
On the secondary windings output end of the first transformer 12, the second electromagnetic pulse module includes the second AC power source 21, the second transformation
Device 22, the second capacitor group 23, the second high-voltage switch gear 24 and the second loop coil 25, the input terminal connection of the second AC power source 21
The armature winding input terminal of second transformer 22, the second high-voltage switch gear 24 and the second loop coil 25 series connection after with the second capacitor
Group 23 is connected in parallel on together on the secondary windings output end of the second transformer 22, and the capacitance of first capacitor device group 13 is greater than the second electricity
The capacitance of container group 23, the internal diameter of first annular coil 15 are greater than the outer diameter of metal-rubber pipe 3, the second loop coil 25 it is outer
Diameter is less than the internal diameter of base tube 4.The electromagnetic pulse that whole welder does not have to specification with two combines, and makes its set in metal rubber
The first annular coil 15 of 3 outer wall of sebific duct and the electric current generated than cover 4 inner wall of base tube the second loop coil 25 and generate
Electric current is big, is overlapped using the electromagnetic pulse of two different sizes and eliminates induced electricity caused by metal-rubber pipe 3 and base tube 4
Stream makes metal-rubber pipe 3 and base tube 4 generate same direction current under magnetic field force effect, generates attractive flux field power between two pipes.
When the first AC power source 11 is charged by the first transformer 12 to first capacitor device group 13, the second AC power source 21 is logical
After the second transformer 22 is crossed to the charging of the second capacitor group 23, it is also turned on the first high-voltage switch gear 14 and the second high-voltage switch gear 24,
Then first capacitor device group 13 and the second capacitor group 23 spark, and first capacitor device group 13 and 23 capacity of the second capacitor group are not
Together, the electric current of generation is also different.Application of the electromagnetic pulse welding procedure that there is now on aluminum alloy conduit is compared, the present invention is not
There is the electromagnetic energy of the electromagnetic pulse generation with different size to be overlapped elimination with point, under the action of magnetic induction line, makes metal
Rubber tube 3 and base tube 4 generate attracting magnetic force, and two pipes fit closely, and reduce welding gap, enhance weld strength；Existing electromagnetism
Pulse technique solves the welding on aluminum alloy conduit head and head, and present invention solution is the welding of sandwich tube, and wherein sandwich is special
Different material metal-rubber, according to the particularity of the elastic cellular substance of metal-rubber homogeneous, it is not easy to by metal-rubber and rigidity
Body connection, the present invention utilize electromagnetic pulse welding technique, using two electromagnetic coils and two capacitor groups by the gold of more empty shapes
Belong to rubber tube 3 and base tube 4 welds, then metal-rubber can be applied to largely in pipe-line system, make vibration damping and shock resistance effect more
It is good.Electromagnetic pulse device top partial view diagram is as shown in Fig. 2.
Flow through electromagnetic energy that the high current of first annular coil 15 and the second loop coil 25 generates as welding heat source and
Carry out the welding of metal-rubber pipe 3 and base tube 4, electromagnetic pulse welding metal rubber damping sandwich tube welding such as attached drawing 3.It is to be welded
Part metal-rubber pipe 3 generates instantaneous, high pressure an electromagnetic force F under the action of electromagnetic energy, which forces weldment metal-rubber pipe 3
Another weldment base tube 4 of high-speed impact, as condition (such as pressure F, contact velocityv c And contact angleα) when meeting, then it can make metal
Rubber tube 37 is welded on base tube 48, amplifies point at A in Fig. 2 for weld, and wherein weld is line face contact such as attached drawing 4.
The size of pressure F value is determined by the property etc. of electric current and voltage and workpiece material to be welded itself.Contact velocityv c
There is direct relation with contact angle, whereinv r For radial velocity,v c For contact velocity,αFor contact angle；There is certain by this three
Correlativity, as the formula (1).
(1)
Whereinv c The size of value is one of an important factor for whether two workpiece to be welded can be welded successfully, whenv c Value reaches
Certain numerical value could generate metal jet between workpiece to be welded, and this is one of the necessary condition for realizing electromagnetic pulse welding, is such as wanted
Realize electromagnetic pulse welding,v c Value range is 250 ~ 2300m/s.Known according to formula (1), contact angleαIt affectsv c Withv r The two
Relationship,αNumerical value depend on gap and length to be welded between workpiece to be welded, so to-be-welded pieces match, 3 He of metal-rubber pipe
Gap width between base tube 4 should not be too large, to guarantee the fastness of welding.
It after completing welding, using same operating method, is welded with other base tube 4, ultimately forms metal-rubber damping folder
Core pipe.
By taking metal-rubber pipe 3 and base tube 4 as an example, circuit is connected by such as attached drawing 1, as shown in Fig. 2, the electromagnetic pulse is welded
Metal-rubber damp sandwich tube device working method the following steps are included:
1) metal-rubber pipe 3 is set on base tube 4, first annular coil 15 is set in metal-rubber pipe 3 outer (i.e. first
Outer wall of 15 anchor ear of loop coil in metal-rubber pipe 3), the second loop coil 25 is inserted into base tube 4,14 He of the first high-voltage switch gear
Second high-voltage switch gear 24 controls on-off by impulse generator.
2) unbalanced pulse generator, the first AC power source 11 and the second AC power source 21 charge to capacitor group simultaneously, fill
When piezoelectric voltage reaches setting value, it is also turned on the first high-voltage switch gear 14 and the second high-voltage switch gear 24, makes capacitor group repid discharge,
Electric current, electric current side in first annular coil 15 and the second loop coil 25 are generated in first annular coil 15 and the second shape coil
To opposite (current direction is as shown in Figure 2), and electric current I in first annular coil 151Numerical value is greater than electricity in the second loop coil 25
Flow I2Numerical value.
The welding schematic diagram such as attached drawing 2 of metal-rubber pipe 3 and base tube 4, using generated under the action of electromagnetic energy it is one instantaneous,
The electromagnetic force F of high pressure makes another weldment base tube 4 of 3 high-speed impact of weldment metal-rubber pipe under the action of the power, considers metal rubber
Glue is cellular, elasticity with higher, preferable fatigue behaviour, corrosion resistance, inoxidizability, the i.e. microcosmic knot of its in welding process
Structure will not change, and the binding force of electromagnetic pulse welding is equivalent to the power for diffusing into one another workpiece atom, and utilization is cavernous
It is more prominent on metal-rubber pipe 3, keep weld seam bond strength therebetween big, metal-rubber pipe 3 and 4 weld of base tube are that line face connects
Touching such as attached drawing 4.Wherein, the thickness D of metal-rubber pipe 31With the thickness D of base tube 42Meet following formula: 2D2>D1>D2。
Claims (4)
1. a kind of device of electromagnetic pulse welding metal rubber damping sandwich tube, which is characterized in that including the first electromagnetic pulse mould
Block and the second electromagnetic pulse module, first electromagnetic pulse module and the second electromagnetic pulse module include AC power source, become
Depressor, capacitor group, high-voltage switch gear and loop coil, the armature winding input of the input terminal connection transformer of the AC power source
It is connected in parallel on together with capacitor group on the secondary windings output end of transformer after end, the high-voltage switch gear and loop coil series connection,
The capacitance of the capacitor group of first electromagnetic pulse module be greater than the second electromagnetic pulse module capacitor group capacitance, first
The internal diameter of the loop coil of electromagnetic pulse module is greater than the outer diameter of metal-rubber pipe, the loop coil of the second electromagnetic pulse module
Outer diameter is less than the internal diameter of base tube.
2. the device of electromagnetic pulse welding metal rubber damping sandwich tube according to claim 1, which is characterized in that described
High-voltage switch gear controls on-off by impulse generator.
3. a kind of working method of the device of electromagnetic pulse welding metal rubber damping sandwich tube as described in claim 1,
It is characterized in that, comprising the following steps:
1) metal-rubber pipe sleeve being located on base tube, the loop coil of the first electromagnetic pulse module is set in outside metal-rubber pipe,
In the loop coil insertion base tube of second electromagnetic pulse module；
2) it after the AC power source of the first electromagnetic pulse module and the second electromagnetic pulse module charges to capacitor group simultaneously, connects simultaneously
The high-voltage switch gear of logical first electromagnetic pulse module and the second electromagnetic pulse module, the first electromagnetic pulse module and the second electromagnetic pulse
Generate electric current in the loop coil of module, electric current in the loop coil of the first electromagnetic pulse module and the second electromagnetic pulse module
It is contrary, and current values are greater than the loop coil of the second electromagnetic pulse module in the loop coil of the first electromagnetic pulse module
Interior current values；
Under the action of the first electromagnetic pulse module and the second electromagnetic pulse module, generate metal-rubber pipe and base tube attracting
Magnetic force and the welding that closely fits.
4. working method according to claim 3, which is characterized in that the thickness D of the metal-rubber pipe1With the thickness of base tube
Spend D2Meet following formula: 2D2>D1>D2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810340359.1A CN108274108B (en) | 2018-04-17 | 2018-04-17 | The device and its working method of electromagnetic pulse welding metal rubber damping sandwich tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810340359.1A CN108274108B (en) | 2018-04-17 | 2018-04-17 | The device and its working method of electromagnetic pulse welding metal rubber damping sandwich tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108274108A CN108274108A (en) | 2018-07-13 |
| CN108274108B true CN108274108B (en) | 2019-05-10 |
Family
ID=62811570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810340359.1A Expired - Fee Related CN108274108B (en) | 2018-04-17 | 2018-04-17 | The device and its working method of electromagnetic pulse welding metal rubber damping sandwich tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108274108B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113275733B (en) * | 2021-06-22 | 2022-06-24 | 南昌航空大学 | Electromagnetic pulse material increasing device and method for aviation multi-runner pipe fitting |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0946080A1 (en) * | 1998-03-23 | 1999-09-29 | Mitsubishi Heavy Industries, Ltd. | High frequency heating coil device |
| US6844533B1 (en) * | 2003-08-29 | 2005-01-18 | Ksp Technologies Corp. | Induction heating apparatus |
| CN1621175A (en) * | 2003-09-10 | 2005-06-01 | 达纳公司 | Method for monitoring the performance of a magnetic pulse forming or welding process |
| CN103861931A (en) * | 2014-04-01 | 2014-06-18 | 湖南大学 | Device and method for machining composite energy absorption tube |
| CN106715030A (en) * | 2014-08-08 | 2017-05-24 | 福特全球技术公司 | Electrode cartridge for pulse welding |
| CN206732355U (en) * | 2017-05-17 | 2017-12-12 | 重庆市光学机械研究所 | Electromagnetic pulse welder |
-
2018
- 2018-04-17 CN CN201810340359.1A patent/CN108274108B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0946080A1 (en) * | 1998-03-23 | 1999-09-29 | Mitsubishi Heavy Industries, Ltd. | High frequency heating coil device |
| US6844533B1 (en) * | 2003-08-29 | 2005-01-18 | Ksp Technologies Corp. | Induction heating apparatus |
| CN1621175A (en) * | 2003-09-10 | 2005-06-01 | 达纳公司 | Method for monitoring the performance of a magnetic pulse forming or welding process |
| CN103861931A (en) * | 2014-04-01 | 2014-06-18 | 湖南大学 | Device and method for machining composite energy absorption tube |
| CN106715030A (en) * | 2014-08-08 | 2017-05-24 | 福特全球技术公司 | Electrode cartridge for pulse welding |
| CN206732355U (en) * | 2017-05-17 | 2017-12-12 | 重庆市光学机械研究所 | Electromagnetic pulse welder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108274108A (en) | 2018-07-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Sabzehgar et al. | Energy regenerative suspension using an algebraic screw linkage mechanism | |
| Cui et al. | A novel arc-shaped lightweight magnetic coupler for AUV wireless power transfer | |
| Zhu et al. | An integrated AC choke design for common-mode current suppression in neutral-connected power converter systems | |
| CN108274108B (en) | The device and its working method of electromagnetic pulse welding metal rubber damping sandwich tube | |
| CN103758657B (en) | Acoustic resonance type traveling wave thermoacoustic power generation system | |
| US6990840B2 (en) | Conjoining apparatus using electromagnetic forming | |
| CN109027088A (en) | A kind of mixed shock absorber based on Stewart structure | |
| CN102128295A (en) | Electrically operated valve | |
| Luca et al. | Inductive power transfer: Through a bondgraph analogy, an innovative modal approach | |
| CN105932788A (en) | Point-to-point wireless power supply coil coupling model and point-to-point wireless power supply system | |
| Yang et al. | Design of a high lateral misalignment tolerance magnetic coupler for wireless power transfer systems | |
| CN101430961A (en) | Novel inductor iron core | |
| CN210088255U (en) | Metal corrugated pipe and flange connecting structure | |
| Mohamed et al. | Shielding Techniques of IPT System for Electric Vehicles' Stationary Charging | |
| Xiong et al. | A dual-coil method for electromagnetic attraction forming of sheet metals | |
| Aganti et al. | Integrated double-sided LCC compensation topology for an electric vehicle wireless charging system | |
| CN211889419U (en) | Composite co-pushing type ultrasonic transducer system | |
| Li et al. | Design, numerical simulation, and experimental validation of a novel electromagnetic blank holding system for conventional drawing process | |
| CN209109537U (en) | Digital large power supersonic generator and supersonic wave cleaning machine | |
| CN214147017U (en) | Magnetic fluid pipeline vibration and noise reduction device | |
| CN206489962U (en) | A kind of sensing heating portable hand-held formula transformer | |
| Shim et al. | Distribution of electromagnetic force of square working coil for high-speed magnetic pulse welding using FEM | |
| CN210755810U (en) | Double-end ultrasonic welding machine | |
| CN102392864B (en) | Magnetic force shock-absorbing device | |
| Kitano et al. | A new wireless EV charger using single switch ZVS resonant inverter with optimized power transfer and low-cost PFC |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190510 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |