CN1037248C - Phase-Locked high frequency hot press - Google Patents
Phase-Locked high frequency hot press Download PDFInfo
- Publication number
- CN1037248C CN1037248C CN92104322A CN92104322A CN1037248C CN 1037248 C CN1037248 C CN 1037248C CN 92104322 A CN92104322 A CN 92104322A CN 92104322 A CN92104322 A CN 92104322A CN 1037248 C CN1037248 C CN 1037248C
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- frequency
- phase
- output
- travelling gear
- oscillator
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- 239000013078 crystal Substances 0.000 claims abstract description 6
- 230000002457 bidirectional effect Effects 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 10
- 230000002441 reversible effect Effects 0.000 claims description 9
- 238000004146 energy storage Methods 0.000 claims description 5
- 239000004020 conductor Substances 0.000 claims description 3
- 238000013016 damping Methods 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 abstract description 8
- 238000001914 filtration Methods 0.000 abstract description 6
- 238000003466 welding Methods 0.000 abstract description 6
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 239000010985 leather Substances 0.000 abstract description 2
- 239000004033 plastic Substances 0.000 abstract description 2
- 239000002985 plastic film Substances 0.000 abstract description 2
- 229920006255 plastic film Polymers 0.000 abstract description 2
- 230000002146 bilateral effect Effects 0.000 abstract 1
- 230000004927 fusion Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005685 electric field effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
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Abstract
The present invention relates to a phase locking high-frequency welder of which the main structure comprises a reference crystal oscillator (1), a frequency and phase discriminator (3), a loop filter (4), a bilateral switch (5), an electromechanical tuning servomechanism (6), a high-frequency large-power oscillator (7) of an electronic tube, frequency divider (2, 8), a power supply (9) and a welding mechanism (10). In the present invention, an electromechanical coupling voltage-controlled tuning VCO component is arranged on the basis of a high-frequency large-power self-excitation oscillator of an electronic tube, and an oscillation frequency/phase is tuned and locked electromechanically so as to realize phase locking, frequency stabilization and narrow band tracking filtration, inhibit industrial electromagnetic interference, shorten fusion welding time and enhance welding efficiency. The present invention is suitable for the production of plastic film products and plastic leather products in the environment of which the electromagnetic compatibility requirements are high.
Description
The present invention relates to a kind of phase-locked high frequency hot press.
At present, be used to produce the high-frequency thermocompressor of moulding leather, plastic film goods and be by the high power valve self-excited oscillator and produce electric field, utilize plastic medium to produce heat under the high-frequency electric field effect, in addition mechanical pressure is shaped again.Usually, the power output of high-frequency thermocompressor is more than the kw level, and its vibration fundamental frequency is chosen the industry science doctor ISM frequency of IEC/CISPR (11) regulation.Because workpiece melting welding precision and heat sealing quality must straightforward manipulations, add the needs of heat seal large-scale workpiece and complex part, the heat seal head can't be provided with electromagnetic shielding, so high-frequency electromagnetic wave excitation is very strong, and general high-frequency high-power self-excited oscillator all adopts inductance capacitance or cavity to form resonant tank for the frequency-selecting element, therefore frequency stability is poor, shared bandwidth, and harmonic content height, especially workpiece medium equiva lent impedance becomes the part of high-frequency generator resonant tank directly or indirectly, workpiece size, the difference of dielectric material can make resonant parameter sharply change, make frequency of oscillation produce bigger skew, the frequency tolerance that exceeds the ISM allocation, disturb the telecommunication apparatus of adjacent channel, in addition, since existing high-frequency thermocompressor because of power supply only through rectification filtering industrial frequency AC composition not, thereby produce the power frequency AM interference, higher-order of oscillation waveform intermittently rises and falls, though peak value is very high, the average electrical power that the medium heat seal unit interval absorbs is but not high, the heat seal melting welding time is long, effect is low, and along with the high frequency carrier radiation produces strong electromagnetic interference to surrounding environment.Therefore, existing high-frequency thermocompressor not only disturbs very big to surrounding environment, and self effect is lower.
The objective of the invention is to overcome above-mentioned weak point of the prior art and establish sweet a kind of phase-locked high frequency hot press, thereby stablize the high-frequency heating frequency of oscillation, reduce bandwidth, suppress the adjacent interference frequently of medium heat co oscillation frequency shift (FS), realize narrow-band tracking filter, filtering harmonic radiation energy; Also suppress the power frequency modulation simultaneously and further reduce electromagnetic interference, the shortening heat union-melt weld time, obtain higher heat seal effect.
Technical solution of the present invention is, a kind of phase-locked high frequency hot press, it comprises electron tube high-frequency high-power oscillator (7), power supply (9) and heat device (10), main points of the present invention are that the input at electron tube high-frequency high-power oscillator (7) is connected to one by bidirectional switch (5) drive electrical mechanical tuning servomechanism (6), bidirectional switch (5) input is connected to the output of loop filter (4), loop filter (4) input links to each other with phase frequency detector (3) output, be connected to frequency divider (2) between the input of benchmark crystal oscillator (1) and phase frequency detector (3), be connected to frequency divider (8) between the output of another input of phase frequency detector (3) and electron tube high-frequency high-power oscillator (7).
Dynamo-electric tuning servomechanism of the present invention (6) is by butterfly-shaped air medium variable capacitor (15), reversible electrical micro-machine (11), travelling gear (12,13) form, reversible electrical micro-machine (11) electrode is connected to the output of bidirectional switch (5), travelling gear (12) is located on the reversible electrical micro-machine arbor, butterfly-shaped air medium variable capacitor (15) is connected on the resonant tank of electron tube high-frequency high-power oscillator (7), travelling gear (13) is located on the moving plate axle of this variable capacitor, travelling gear (13) is made with the biplate good conductor, this travelling gear edge is provided with magnetic induction damping card (14), and this travelling gear is provided with the loading spring (16) of eliminating backlash.
The bridge rectifier output of power supply of the present invention (9) is connected to π type energy storage low-pass filter network, electrical tube filament transformer B
2Secondary centre tap or cross-over connection resistance are got central point and are connected on the π type energy storage low-pass network output.
Below with reference to accompanying drawing and enforcement side the present invention is made further detailed description.
Fig. 1 is a circuit block diagram of the present invention.
Fig. 2 is the structural representation of the dynamo-electric tuning servomechanism of the present invention (6).
Fig. 3 is the A-A cutaway view of Fig. 2.
Fig. 4 is the line map of power supply of the present invention (9).
Fig. 5 is the electrical schematic diagram of the embodiment of the invention.
With reference to Fig. 1, Fig. 2, Fig. 3, the reference signal of benchmark crystal oscillator (1) output adds to an input of phase frequency detector (3) behind frequency divider (2), another input of phase frequency detector (3) is through the output signal of frequency divider (8) reception from electron tube high-frequency high-power oscillator (7), after phase frequency detector (3) carries out frequency/corresponding comparison to two signals importing, to error signal of loop filter (4) output, by loop filter (4) filtering baseband noise and high frequency noise jamming, to keep good loop dynamics, reversible electrical micro-machine (11) from signal controlling bidirectional switch (5) the driving machine electric tuning servomechanism (6) of loop filter (4) output rotates, drive is arranged on the travelling gear (12) on its arbor, travelling gear (12) is the travelling gear (13) that is engaged with of transmission again, travelling gear (13) then is arranged on the moving plate axle of the butterfly-shaped air dielectric capacitor (15) on high-frequency high-power oscillator (7) resonant tank, thereby dynamo-electric tuning servomechanism (6) can draw the variation that high-frequency high-power oscillator (7) is followed the tracks of frequency input signal and phase place.Realize that for better mechanical-electric coupling is tuning, reach the voltage/frequency conversion, finish loop VCO function, travelling gear of the present invention (13) adopts the biplate good conductor to make, this gear is provided with loading spring (16) to eliminate the backlash return difference, like this, just can make this gear when the positive and negative rotation of travelling gear (12) with it tight engagement and unlikely generation between cog comes to nothing phenomenon.And the setting of magnetic induction damping card (14) then is to utilize eddy current to cooperate brake electric tuning movement inertia, makes butterfly-shaped air dielectric capacitor (15) be tuned to the locking frequency equilbrium position and stops immediately.
When two phase of input signals difference ∮ (t)=0 of phase frequency detector (3), phase frequency detector (3) is output as zero, air dielectric capacitor (15) is tuned in the centre frequency fo of high-frequency high-power oscillator (7), its frequency stability is only given by benchmark crystal oscillator (1), loop is in the lock state, at this moment, bidirectional switch (5) is two-way all to be ended, and reversible electrical micro-machine stops operating.When ∮ (t) ≠ 0, the error signal of phase frequency detector (3) output is through loop filter (4) control bidirectional switch (5), make its correspondence one to conducting, again by reversible electrical micro-machine (11) transmission variable reactive element, make it to keep Phase synchronization, loop is in the lock state.
Heating cycle changes, when ∮ (t) increases or reduces 2 π, heat seal frequency of oscillation fo skew produces frequency difference, phase frequency detector (3) has the frequency discrimination function of the very wide off-resonance frequency scope of catching, its output difference frequency raises, the error voltage pulse duty factor reduces, bidirectional switch (5) servomechanism of controller electric tuning promptly (6), high-frequency high-power oscillator (7) is changed to reducing the frequency difference direction, force the oscillation output signal frequency to frequency input signal by disturbing, difference frequency is more and more lower, and is locked until eliminating frequency difference fully.When being zero, frequency difference shows high-frequency high-power oscillator (7) output frequency f
oCorrectly, loop changes phase-locked control automatically over to.
With reference to Fig. 4, the rectification output end of power supply of the present invention (9) is connected to an inductance, the π type energy storage low-pass filter network that electric capacity and resistance are formed, with filtering industrial frequency AC composition, and be connected on the output of π type low-pass filter network at oscillating tube filament transformer secondary coil centre cap, to offset the industrial frequency AC component, the high-frequency output voltage that makes electron tube high-frequency high-power oscillator (7) is a continuous wave, thereby improve medium heating absorbed power, the shortening heat union-melt weld time, reduce power consumption, reduce electromagnetic interference intensity simultaneously, and promote the phase-locked loop steady operation.
Fig. 5 is one embodiment of the present of invention.
Wherein bidirectional switch (5) is by NAND gate G
1, G
2, triode BG
1, BG
2And resistance R
1, R
2Form, this switching circuit has higher switching speed, therefore can adapt to the variation of error pulse preferably.
Electron tube high-frequency high-power oscillator (7) output circuit has adopted the compound output loop of inductance Critical Coupling, make vibration active device and equivalent load impedance obtain optimum Match, to obtain peak power output, because butterfly-shaped air medium variable capacitor (15) carries out tuning control at output loop, phase-locked loop is followed the tracks of the variation of frequency input signal and phase place all the time, and the low-pass characteristic of loop filter (4) only allows near the radio-frequency component of input signal to pass through, therefore, phase-locked loop can be realized narrow-band filtering in very wide frequency range, highly stable vibration first-harmonic centre frequency suppresses the generation of harmonic wave.
Main devices in the circuit of the present invention mostly adopts integrated circuit, has higher performance, and implements easily.Phase-locked heat-sealing machine constructed in accordance, it is stable to add thermal oscillation frequency, and the heat seal melting welding time is short, heat seal effect height, and also electromagnetic interference to external world is very little.
Claims (4)
1, a kind of phase-locked high frequency hot press, comprise electron tube high-frequency high-power oscillator (7), power supply (9), heat device (10), it is characterized in that it also comprises benchmark crystal oscillator (1), phase frequency detector (3), loop filter (4), bidirectional switch (5), dynamo-electric tuning servomechanism (6), frequency divider (2,8), phase frequency detector (3) wherein, loop filter (4), bidirectional switch (5), dynamo-electric tuning servomechanism (6), electron tube high-frequency high-power oscillator (7) and frequency divider (8) constitute a phase-locked loop, frequency divider (2) is located between the input of the output of benchmark crystal oscillator (1) and phase frequency detector (3), frequency divider (8) is arranged between another input of the output of electron tube high-frequency high-power oscillator (7) and phase frequency detector (3), the input of phase frequency detector (3) output T-Ring path filter (4), the output of the input linkloop filter (4) of bidirectional switch (5).
2, phase-locked high frequency hot press according to claim 1, it is characterized in that dynamo-electric tuning servomechanism (6) is mainly by reversible electrical micro-machine (11), travelling gear (12,13) and butterfly-shaped air medium variable capacitor (15) constitute, the output of the electrode of wherein reversible electrical micro-machine (11) and bidirectional switch (5) joins, travelling gear (12) is arranged on the arbor of reversible electrical micro-machine (11), travelling gear (13) is arranged on the moving plate axle of butterfly-shaped air medium variable capacitor (15), and butterfly-shaped air variable capacitor (15) is connected on the resonant tank of high-frequency high-power oscillator (7).
3, phase-locked high frequency hot press according to claim 1 and 2, it is characterized in that travelling gear (13) makes with the biplate good conductor, the edge of travelling gear (13) is provided with magnetic induction damping card (14), and travelling gear (13) is provided with the loading spring (16) of eliminating backlash.
4, phase-locked high frequency hot press according to claim 1 is characterized in that the bridge rectifier output of power supply (9) is connected to π type energy storage low-pass filter network, electrical tube filament transformer B
2Secondary centre tap or cross-over connection resistance are got central point and are connect on the π type energy storage low-pass filter network output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92104322A CN1037248C (en) | 1992-06-05 | 1992-06-05 | Phase-Locked high frequency hot press |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92104322A CN1037248C (en) | 1992-06-05 | 1992-06-05 | Phase-Locked high frequency hot press |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1069223A CN1069223A (en) | 1993-02-24 |
| CN1037248C true CN1037248C (en) | 1998-02-04 |
Family
ID=4940738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92104322A Expired - Fee Related CN1037248C (en) | 1992-06-05 | 1992-06-05 | Phase-Locked high frequency hot press |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1037248C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056713C (en) * | 1996-01-18 | 2000-09-20 | 阮树成 | Phase-serve-modulating device for quick precision lock |
| CN1066392C (en) * | 1996-01-18 | 2001-05-30 | 阮树成 | Phase locking servo tuning device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4238740A (en) * | 1979-02-02 | 1980-12-09 | Bell Telephone Laboratories, Incorporated | Phase-locked loop for PCM transmission systems |
| JPS61183894A (en) * | 1985-02-09 | 1986-08-16 | 河西工業株式会社 | High frequency welder |
-
1992
- 1992-06-05 CN CN92104322A patent/CN1037248C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4238740A (en) * | 1979-02-02 | 1980-12-09 | Bell Telephone Laboratories, Incorporated | Phase-locked loop for PCM transmission systems |
| JPS61183894A (en) * | 1985-02-09 | 1986-08-16 | 河西工業株式会社 | High frequency welder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1069223A (en) | 1993-02-24 |
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| PB01 | Publication | ||
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| OR01 | Other related matters | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |