An electret processor and its automatic tracking circuit

Abstract

The present invention discloses an electret processing machine, comprising a step-up transformer and an electret processing frame. The electret processing frame comprises a bracket, left and right wall panels, and a corona roller. The left wall panel is mounted with a high-voltage junction box, a bellows connector, and a high-voltage mounting base, which is equipped with wire-break protection mounting plates I and II. The right wall panel is mounted with a non-high-voltage mounting base, which is equipped with a handwheel, a ratchet wrench, a high-voltage pulley, and a high-voltage pulley cover. A tungsten filament is disposed between the high-voltage mounting base and the high-voltage pulley. The step-up transformer is connected to the high-voltage junction box of the electret processing frame via a high-voltage line, which is in turn connected to wire-break protection mounting plate I via a high-voltage line. The present invention also discloses an automatic tracking circuit for the electret processing machine. This invention is highly efficient and ideal for energy-saving equipment. It operates in a constant current mode, ensuring uniform electret distribution on the fabric surface. Its high power spectrum frequency ensures uniform and dense electret distribution. It features automatic frequency tracking and load impedance matching.

Description

Technical Field

[0001] The invention relates to the technical field of production equipment for melt-blown nonwoven materials, in particular to an electret processing machine and an automatic tracking circuit thereof. Background Art

[0002] Electret has a bulk charge characteristic, meaning its charge, unlike triboelectric charging, appears both on the surface and within the electret. If a layer of the electret surface is removed, the new surface still retains its charge; if it is cut in half, it becomes two pieces of electret. The corona electret is produced by applying tens of kilovolts of high voltage to a linear electrode in low-pressure air, creating a strong electric field near the wire. The nearby air molecules are ionized into positive and negative ions, which frequently recombine. The tip of the electrode radiates a lavender corona glow, accompanied by a "chi, chi" discharge sound. At this point, objects beneath the electrode are affected by the electric field, producing an electret effect.

[0003] The filtration efficiency of meltblown nonwovens after corona charging and electret finishing has been significantly improved. Analysis shows that the electrostatic effect of the electret is the key to the improved filtration efficiency. The electrostatic adsorption capacity of the meltblown nonwoven after electret finishing is enhanced. When dust particles pass through the electret nonwoven, they are strongly attracted by the electrostatic effect. The ceramic powder particles can also maintain this electrostatic effect for a long time. Summary of the Invention

[0004] In order to solve the above-mentioned defects, the purpose of the present invention is to provide an electret processor and an automatic tracking circuit for the electret processor, which have a simple structure, are easy to use, and can effectively improve the filtration efficiency of nonwoven materials.

[0005] To achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions: an electret processing machine, including a step-up transformer and an electret processing frame, the electret processing frame including a bracket, a left wall panel and a right wall panel installed on the bracket, and a corona roller installed between the brackets; a high-voltage junction box is installed on one side of the left wall panel through a nylon column, and the left wall panel is also connected to a bellows joint through a high-voltage flange, and a high-voltage protective sleeve is provided on the outside of the bellows joint; a high-voltage mounting seat is provided on the other side of the left wall panel, and the high-voltage mounting seat is provided with a broken wire protection mounting plate I and a broken wire protection mounting plate II, and a micro switch and a broken wire protection mounting plate are installed on the broken wire protection mounting plate II Shaft, the broken wire protection mounting plate II is installed on the broken wire protection mounting plate I, and the broken wire protection mounting plate I is installed on the high-voltage mounting seat; a non-high-voltage mounting seat is provided on one side of the right wall panel, and a handwheel, a ratchet wrench, a high-voltage wheel and a high-voltage wheel cover are provided on the non-high-voltage mounting seat, the handwheel is fixedly connected to the high-voltage wheel, and a high-voltage wheel cover is provided on the high-voltage wheel, and the handwheel and the high-voltage wheel are fixedly connected to the non-high-voltage mounting seat through a ratchet wrench; a tungsten wire is provided between the high-voltage mounting seat and the high-voltage wheel; the step-up transformer is connected to the high-voltage junction box of the electret treatment frame through a high-voltage line, and the high-voltage junction box is connected to the broken wire protection mounting plate I through a high-voltage line.

[0006] Furthermore, a safety grounding pile is provided on one side of the electret treatment frame.

[0007] Furthermore, a broken wire protection line is provided on the micro switch on the broken wire protection mounting plate II.

[0008] Furthermore, the micro switch is connected to the step-up transformer via a signal line.

[0009] Furthermore, the high-voltage mounting seat, the broken wire protection mounting plate I, the broken wire protection mounting plate II, the micro switch and the broken wire protection shaft are all made of insulating materials.

[0010] Furthermore, the bottom of the broken wire protection mounting plate II is crimped to the tungsten wire, and the top of the broken wire protection mounting plate II is crimped to the micro switch.

[0011] The present invention also provides an automatic tracking circuit for an electret processor, comprising an integrated circuit IC3, an integrated circuit IC6, an integrated circuit IC5, and an integrated circuit IC7; the integrated circuit IC3 is an LM393 comparator, and the integrated circuit IC3 includes independent integrated circuits IC3A and IC3B; the integrated circuit IC6 is a CD4011 integrated circuit, and the integrated circuit IC6 is a 4-channel 2-input NAND gate circuit, and all output parts of the integrated circuit IC6 are provided with buffers; the integrated circuit IC5 is composed of two identical, independent data-type flip-flops, each having independent data, set, reset, and clock inputs and Q and Q- outputs; the integrated circuit IC7 is a six-channel non-inverting buffer.

[0012] Furthermore, the signal fed back from the load flows in through plug P6, passes through diode D19 and resistor R25, is amplified by transistor T5 and flows out, then passes through resistors R26 and R27, flows into transistor T1, is amplified, flows out from the collector, passes through resistor R29, and charges capacitor C6. The signal on capacitor C6 is input into integrated circuit IC3A through resistor R34. The reference voltages at the non-inverting input terminal of pin 3 and the inverting input terminal of pin 2 of integrated circuit IC3A are compared and sent to the output terminal of pin 1. Then, the output terminal of pin 1 of integrated circuit IC3A is sent to pin 1 of integrated circuit IC6A, which is a CD4011 integrated circuit. The signal on capacitor C6 is input into integrated circuit IC3B through resistor R34. The reference voltages at the non-inverting input terminal of pin 5 of the integrated circuit IC3B and the inverting input terminal of pin 6 are compared and sent to the output terminal of pin 7, and then sent from the output terminal of pin 7 of the integrated circuit IC3B to pin 2 of the integrated circuit IC6A, output from pin 3 of the integrated circuit IC6A after passing through a NAND gate, and then sent to pin 12 of the integrated circuit IC6D, and after being NANDed with the high level of pin 13, the result is sent to pin 11 of the integrated circuit IC6D; pin 11 of the integrated circuit IC6D is sent all the way to pin 3 of the integrated circuit IC5A as a clock terminal; frequency signals with completely opposite phases and exactly the same frequency are output from the output terminals of pins 1 and 2 of the integrated circuit IC5A respectively, and then sent to pin 8 of the integrated circuit IC6C and pin 5 of the integrated circuit IC6B respectively; pin 11 of the integrated circuit IC6D is also sent to pin 3 of the integrated circuit IC5A as a clock terminal; frequency signals with completely opposite phases and exactly the same frequency are output from the output terminals of pins 1 and 2 of the integrated circuit IC5A respectively, and then sent to pin 8 of the integrated circuit IC6C and pin 5 of the integrated circuit IC6B respectively; pin 11 of the integrated circuit IC6D is sent to pin 3 of the integrated circuit IC5A as a clock terminal; frequency signals with completely opposite phases and exactly the same frequency are output from the output terminals of pins 1 and 2 of the integrated circuit IC5A respectively, and then sent to pin 8 of the integrated circuit IC6C and pin 5 of the integrated circuit IC6B respectively; One path is respectively sent to pin 9 of the integrated circuit IC6C and pin 6 of the integrated circuit IC6B; pin 8 of the integrated circuit IC6C and pin 9 of the integrated circuit IC6C are ANDed together and then output to pin 10 of the integrated circuit IC6C; pin 6 of the integrated circuit IC6B and pin 5 of the integrated circuit IC6B are ANDed together and then output to pin 4 of the integrated circuit IC6B; pin 10 of the integrated circuit IC6C is sent to the base of the transistor T7 through the integrated circuits IC7A, IC7B, IC7C and resistors R22, R21, and R20; pin 4 of the integrated circuit IC6B is sent to the base of the transistor T6 through IC7D, IC7E, IC7F and resistors R19, R18, and R17; T6 and T7 are silicon NPN bipolar transistors; and then the power is sent to the plug P6 through the collectors of T6 and T7.

[0013] The present invention has high efficiency and can adopt internationally advanced resonant power supply technology. Its energy conversion efficiency is as high as 95%, and the self-loss of electric power is very small.

[0014] The present invention can adopt a constant current working mode, that is, when the electret roller has a certain degree of jump when rotating and the medium of the processed cloth is uneven, the high-frequency current flux through the cloth surface remains constant, which ensures the uniformity of the electret on the cloth surface and significantly improves the quality and composite strength of the cloth.

[0015] The present invention adopts a full electronic protection form and has output short circuit, wire break open circuit and overload protection functions.

[0016] The power spectrum frequency of the present invention reaches 15kHz-25kHz, and the electret of the fabric surface is more uniform and dense than that of traditional fabric treatment equipment. The surface of the fabric treated with electret is smooth, and the appearance and durability of the non-woven fabric are not affected by the treatment.

[0017] This invention can process meltblown filter materials online or independently on finished products. High-pressure treatment in the processor significantly improves the material's filtration efficiency. The electret treatment rack structure can be customized to the customer's production site, and the entire system can accommodate varying filter material widths and production line speeds. The product incorporates multiple protective features to ensure safety and reliability during production.

[0018] The beneficial effects of the present invention are: high efficiency, ideal energy-saving equipment; constant current working mode ensures uniform electret on the cloth surface; high power spectrum frequency makes the electret uniform and dense; automatic frequency tracking and load impedance automatic matching. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0021] Figure 3 for Figure 1 Schematic diagram of the enlarged structure at point B in the middle.

[0022] Figure 4 Schematic diagram of the automatic tracking circuit of the electret processor of the present invention.

[0023] Among them: 1. Bracket, 2. Left wall panel, 3. High-voltage mounting seat, 4. High-voltage flange, 5. Bellows joint, 6. High-voltage protective sleeve, 7. High-voltage junction box, 8. Nylon column, 9. Handwheel, 10. Ratchet wrench, 11. High-voltage wheel, 12. High-voltage wheel cover, 13. Non-high-voltage mounting seat, 14. Corona roller, 15. Tungsten wire, 16. Broken wire protection mounting plate I, 17. Broken wire protection mounting plate II, 18. Micro switch, 19. Broken wire protection shaft, 20. Step-up transformer, 21. Right wall panel, 22. High-voltage line, 23. Signal line. DETAILED DESCRIPTION

[0024] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0025] like Figure 1 As shown, an electret treatment machine includes a step-up transformer 20 and an electret treatment frame. The electret treatment frame includes a frame 1, a left wall panel 2 and a right wall panel 21 mounted on the frame 1, and a corona roller 14 mounted between the frames 1. A safety grounding stake is provided on one side of the electret treatment frame.

[0026] like Figure 1 、 Figure 2 As shown, a high-voltage junction box 7 is mounted on one side of the left wall panel 2 via nylon columns 8. A bellows connector 5 is also connected to the left wall panel 2 via a high-voltage flange 4, and a high-voltage protective sleeve 6 is installed over the bellows connector 5. A high-voltage mounting base 3 is located on the other side of the left wall panel 2. This base 3 is equipped with a wire-break protection mounting plate I 16 and a wire-break protection mounting plate II 17. A microswitch 18 and a wire-break protection shaft 19 are mounted on the wire-break protection mounting plate II 17. The wire-break protection mounting plate II 17 is mounted on the wire-break protection mounting plate I 16, which is in turn mounted on the high-voltage mounting base 3. A step-up transformer 20 is connected to the high-voltage junction box 7 of the electret processing frame via a high-voltage line 22. The high-voltage line 22 on the high-voltage junction box 7 is connected to the high-voltage mounting base 3 via a high-voltage protective sleeve 6. High-voltage line 22 must not come into contact with or come into close proximity with people or metal objects during operation. The microswitch 18 is connected to the step-up transformer 20 via a signal line 23. The high voltage mounting seat 3, the broken wire protection mounting plate I 16, the broken wire protection mounting plate II 17, the micro switch 18 and the broken wire protection shaft 19 are all made of insulating materials. The micro switch 18 on the broken wire protection mounting plate II 17 is provided with a broken wire protection line.

[0027] like Figure 1 、 Figure 3 As shown, a non-high-pressure mounting seat 13 is provided on one side of the right wall panel 21, and a handwheel 9, a ratchet wrench 10, a high-pressure wheel 11 and a high-pressure wheel cover 12 are provided on the non-high-pressure mounting seat 13. The handwheel 9 is fixedly connected to the high-pressure wheel 11, and a high-pressure wheel cover 12 is provided on the high-pressure wheel 11. The handwheel 9 and the high-pressure wheel 11 are fixedly connected to the non-high-pressure mounting seat 13 through the ratchet wrench 10.

[0028] A tungsten wire 15 is installed between the high-voltage mounting base 3 on the left wall panel 2 and the high-voltage wheel 11 on the right wall panel 21. A wire-break protection mounting plate II 17 presses down on the tungsten wire 15 and abuts against a microswitch 18. The tungsten wire 15 is connected to a high-voltage line 22 on the high-voltage mounting base 3. The step-up transformer 20 applies high voltage to the tungsten wire 15 through the high-voltage line 22, the high-voltage junction box 7, the high-voltage line 22, the high-voltage protective sleeve 6, the high-voltage line 22, and the high-voltage mounting base 3.

[0029] A certain gap is maintained between the tungsten wire 15 and the corona roller 14 to form a uniform high-voltage electric field. The object to be processed is processed when it passes through the corona roller 14.

[0030] During operation, handwheel 9 rotates, driving high-voltage pulley 11 and the tungsten filament 15 mounted on it. Ratchet wrench 10 ensures that tungsten filament 15 remains taut and prevents slack. Wire-break protection mounting plate II 17 presses down on tungsten filament 15 and presses up against microswitch 18. If tungsten filament 15 breaks, mounting plate II 17 drops, triggering microswitch 18. This signals the step-up transformer 20 via signal line 23, de-energizing it and preventing the high voltage from the broken tungsten filament 15 from injuring workers, thus protecting their safety.

[0031] like Figure 4 As shown, an automatic tracking circuit for an electret processor includes integrated circuits IC3, IC6, IC5, and IC7; integrated circuit IC3 is an LM393 comparator, and integrated circuit IC3 includes independent integrated circuits IC3A and IC3B; integrated circuit IC6 is a CD4011 integrated circuit, and integrated circuit IC6 is a 4-channel 2-input NAND gate circuit, and all output parts of integrated circuit IC6 are provided with buffers; integrated circuit IC5 is composed of two identical, independent data-type flip-flops, and the flip-flops have independent data, set, reset, and clock inputs and Q and Q- outputs; integrated circuit IC7 is a six-channel non-inverting buffer.

[0032] The present invention can realize automatic frequency tracking and automatic load impedance matching. Automatic frequency tracking and automatic load impedance matching are important control characteristics to ensure that the electret machine power supply obtains maximum power output, improves power supply efficiency, and operates safely and stably. During the use of the electret, changes in distance and temperature will eventually cause the natural resonant frequency of the load circuit to change, and it is a nonlinear system. If the inverter is working in a hard switching state at this time, under high frequency and high power conditions, the loss will increase, and the safety and reliability of the inverter will decrease. At the same time, the voltage and current cannot be in the same direction, the power factor will decrease, the maximum power output cannot be achieved, and the power supply efficiency and capacity utilization rate will be reduced. Therefore, frequency tracking control technology must be adopted to make the operating frequency close to the natural resonant frequency and the power factor close to 1, so as to obtain maximum power output and reduce switching losses.

[0033] The operating frequency of the circuit changes with the load characteristics. The feedback circuit can achieve stable frequency automatic tracking and locking, reducing the current and voltage stress of the main circuit power devices, so that they are always in the best working state.

[0034] The principle of automatic circuit tracking is analyzed as follows:

[0035] like Figure 4As shown, the signal fed back from the load flows through plug P6, passes through diode D19 and resistor R25, is amplified by transistor T5, flows through resistors R26 and R27, and then flows into transistor T1. After amplification, it flows out of the collector and, after passing through resistor R29, charges capacitor C6. The signal on capacitor C6 is input into integrated circuit IC3A via resistor R34. IC3 is an LM393 comparator, an integrated circuit consisting of two independent, high-precision voltage comparators. It is a high-gain, wideband device. The reference voltage at the non-inverting input pin 3 of IC3A is compared with the inverting input pin 2, and then fed to the output pin 1. From there, the output pin 1 of IC3A feeds pin 1 of IC6A. IC6A is a CD4011 integrated circuit, a 4-channel, 2-input NAND gate circuit. All outputs are buffered to improve interference immunity and reduce output impedance requirements. The signal on capacitor C6 passes through resistor R34 and is fed into integrated circuit IC3B via another path. The non-inverting input at pin 5 of IC3B is compared with the reference voltage at pin 6, and then fed to pin 7. Pin 7 of IC3B then feeds pin 2 of IC6A. After passing through a NAND gate, it is output from pin 3 of IC6A and fed to pin 12 of IC6D. This signal is then NANDed with the high level at pin 13, and fed to pin 11 of IC6D. Pin 11 of IC6D feeds pin 3 of IC5A, which serves as the clock terminal. IC5 is a CD4013 integrated circuit, consisting of two identical, independent data-type flip-flops. Each flip-flop has independent data, set, reset, and clock inputs, as well as Q and Q- outputs. Pins 1 and 2 of IC5A output signals, with completely opposite phases but identical frequencies, respectively, and feed pin 8 of IC6C and pin 5 of IC6B, respectively. Pin 11 of integrated circuit IC6D is fed to pin 9 of integrated circuit IC6C and pin 6 of integrated circuit IC6B. Pins 8 and 9 of integrated circuit IC6C are then ANDed together and output to pin 10 of integrated circuit IC6C. Pins 6 and 5 of integrated circuit IC6B are then ANDed together and output to pin 4 of integrated circuit IC6B. Pin 10 of integrated circuit IC6C is fed through integrated circuits IC7A, IC7B, and IC7C and resistors R22, R21, and R20 to the base of transistor T7. Pin 4 of integrated circuit IC6B is fed through IC7D, IC7E, IC7F and resistors R19, R18, and R17 to the base of transistor T6. IC7 is a hexagonal non-inverting buffer. T6 and T7 are silicon NPN bipolar transistors. The collectors of T6 and T7 then feed into connector P6. This allows the operating frequency to approach the natural resonant frequency, the power factor to approach unity, maximum power output, and reduced switching losses.

Claims

1. An automatic tracking circuit for an electret processing machine, characterized in that: The integrated circuit comprises IC3, IC6, IC5, and IC7; IC3 is an LM393 comparator, and IC3 comprises independent integrated circuits IC3A and IC3B; IC6 is a CD4011 integrated circuit, and all outputs of IC6 are provided with buffers; IC5 is composed of two identical, independent data-type flip-flops, each with independent data, set, reset, and clock inputs, and Q and Q- outputs; IC7 is a six-way non-inverting buffer; The signal fed back from the load flows in through plug P6, passes through diode D19 and resistor R25, is amplified by transistor T5 and flows out, then passes through resistors R26 and R27, flows into transistor T1, is amplified, flows out from the collector, passes through resistor R29, and charges capacitor C6. The signal on capacitor C6 is input to integrated circuit IC3A through resistor R34. The reference voltages at the non-inverting input of pin 3 and the inverting input of pin 2 of integrated circuit IC3A are compared and sent to the output of pin 1. From the output of pin 1 of integrated circuit IC3A, it is sent to pin 1 of integrated circuit IC6A. The signal on capacitor C6 is input to integrated circuit IC3B via resistor R34. The reference voltages at the non-inverting input of pin 5 and the inverting input of pin 6 of integrated circuit IC3B are compared and sent to the output of pin 7. From the output of pin 7 of integrated circuit IC3B, it is sent to pin 2 of integrated circuit IC6A. After passing through a NAND gate, it is output from pin 3 of integrated circuit IC6A and sent to pin 12 of integrated circuit IC6D. After being NANDed with the high level at pin 13, the result is sent to pin 11 of integrated circuit IC6D. Pin 11 of IC6D is fed to pin 3 of IC5A as the clock terminal. Pin 1 and pin 2 of IC5A output frequency signals with completely opposite phases but identical frequencies, which are then fed to pin 8 of IC6C and pin 5 of IC6B respectively. Pin 11 of IC6D is fed to pin 9 of IC6C and pin 6 of IC6B respectively. Pin 8 of IC6C and pin 9 of IC6C are then ANDed together and output to pin 10 of IC6C. Pin 6 of integrated circuit IC6B and pin 5 of integrated circuit IC6B are ANDed together and then output to pin 4 of integrated circuit IC6B. Pin 10 of integrated circuit IC6C is fed to the base of transistor T7 through integrated circuits IC7A, IC7B, IC7C and resistors R22, R21, and R20. Pin 4 of integrated circuit IC6B is fed to the base of transistor T6 through IC7D, IC7E, IC7F and resistors R19, R18, and R17. T6 and T7 are silicon NPN bipolar transistors. The collectors of T6 and T7 are then fed to plug P6. The operating frequency of the electret processor circuit is changed as the load characteristics change.

2. An electret processing machine, characterized in that: The invention comprises an automatic tracking circuit for an electret processor as claimed in claim 1, comprising a step-up transformer and an electret processing frame, wherein the electret processing frame comprises a frame, a left wall panel and a right wall panel mounted on the frame, and a corona roller mounted between the frames; a high-voltage junction box is mounted on one side of the left wall panel through a nylon column, the left wall panel is further connected to a bellows joint through a high-voltage flange, a high-voltage protective sleeve is provided on the outside of the bellows joint, a high-voltage mounting seat is provided on the other side of the left wall panel, the high-voltage mounting seat is provided with a broken wire protection mounting plate I and a broken wire protection mounting plate II, a micro switch and a broken wire protection shaft are mounted on the broken wire protection mounting plate II, The broken wire protection mounting plate II is installed on the broken wire protection mounting plate I, and the broken wire protection mounting plate I is installed on the high-voltage mounting seat; a non-high-voltage mounting seat is provided on one side of the right wall panel, and a handwheel, a ratchet wrench, a high-voltage wheel and a high-voltage wheel cover are provided on the non-high-voltage mounting seat; the handwheel is fixedly connected to the high-voltage wheel, and a high-voltage wheel cover is provided on the high-voltage wheel. The handwheel and the high-voltage wheel are fixedly connected to the non-high-voltage mounting seat through a ratchet wrench; a tungsten wire is provided between the high-voltage mounting seat and the high-voltage wheel; the step-up transformer is connected to the high-voltage junction box of the electret treatment frame through a high-voltage line, and the high-voltage junction box is connected to the broken wire protection mounting plate I through a high-voltage line.

3. The electret processing machine according to claim 2, wherein: A safety grounding pile is also provided on one side of the electret treatment frame.

4. The electret processing machine according to claim 2, wherein: A broken wire protection line is provided on the micro switch on the broken wire protection installation plate II.

5. The electret processing machine according to claim 2, wherein: The micro switch is connected to the step-up transformer via a signal line.

6. The electret processing machine according to claim 2, wherein: The high-voltage mounting seat, the broken wire protection mounting plate I, the broken wire protection mounting plate II, the micro switch and the broken wire protection shaft are all made of insulating materials.

7. The electret processing machine according to claim 2, wherein: The bottom of the broken wire protection mounting plate II is press-connected with the tungsten wire, and the top of the broken wire protection mounting plate II is press-connected with the micro switch.

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