CN107377534B - A transducer-based variable frequency vibration dust removal device - Google Patents

Abstract

The invention provides a frequency conversion vibration dust removal device based on energy converters, which comprises a multi-frequency ultrasonic generator, a funnel and more than two groups of energy converters, wherein the funnel is elastically connected to a fixed support, the funnel is provided with the more than two groups of energy converters, each group of energy converters comprises two energy converters with the same central frequency and distributed on the surface of the funnel in a bilateral symmetry manner, the central frequencies of the energy converters in different groups are different, and the energy converters are distributed on the surface of the funnel at equal intervals from top to bottom; each transducer input port is connected with the output port of the multi-frequency ultrasonic generator and works under the control of the multi-frequency ultrasonic generator. The invention has the advantages of good dust removal effect, high automation degree, low power consumption and the like.

Description

A transducer-based variable frequency vibration dust removal device

technical field

The invention relates to the technical field of ultrasonic application, in particular to a frequency conversion vibration dust removal device based on a transducer.

Background technique

In the production process of the cigarette factory, due to the certain humidity of the tobacco raw material, the surface of the funnel is often covered with dust. When there are many ash layers, it will have a certain impact on the passability of the funnel. At present, manual beating is mostly used to remove the ash layer. This method has disadvantages such as low efficiency and high cost. Moreover, this method has a good effect on removing dust without humidity, but it is difficult to achieve the purpose of dust removal for the ash layer with a certain humidity.

Chinese patent CN201320427557.4 discloses a rapping mechanism for an electrostatic dust hopper, which uses a rapping motor and a rapping nail to electrically remove dust, thereby improving the dust removal efficiency. However, this design requires someone to supervise the degree of dust removal, manually control the vibration time according to the actual situation, and maintain a frequency of rapping for a long time, which will cause damage to the funnel itself and high energy consumption.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a frequency conversion vibration dust removal device based on a transducer.

The technical solution for realizing the present invention is: a transducer-based variable frequency vibration dust removal device, comprising a multi-frequency ultrasonic generator, a funnel and two or more sets of transducers, wherein:

The funnel is elastically connected to the fixed support, and more than two sets of transducers are arranged on the funnel. Different frequencies, the transducers are distributed on the funnel surface at equal intervals from top to bottom;

Each transducer input port is connected with the output port of the multi-frequency ultrasonic generator, and works under the control of the multi-frequency ultrasonic generator.

Further, the multi-frequency ultrasonic generator includes a rectifier filter circuit, a DC chopper circuit, a full-bridge inverter circuit, a transformer, a relay switch module, a touch screen controller and a control circuit, wherein:

The rectifier filter circuit, the DC chopper circuit, the full-bridge inverter circuit, the transformer, and the relay switch modules are connected in sequence;

The control circuit is connected with the DC chopper circuit for controlling the duty cycle of the DC chopper circuit; the control circuit is connected with the full-bridge inverter circuit for controlling the output of a signal of a specific frequency; the control circuit is connected with the relay The switch module is connected to control the work of the transducer corresponding to the center frequency;

The touch screen controller is connected with the control circuit and is used to manually set the working time of the transducer.

Further, the control circuit includes a DSP chip and a DDS digital frequency synthesizer connected to the DSP chip, the DSP chip is connected to the DC chopper circuit through PWM soft switch control, and the output end of the DDS digital frequency synthesizer is connected to the full frequency synthesizer. The bridge inverter circuit is connected.

Further, the number of the transducers is three groups.

Further, the center frequencies of each group of the transducers from top to bottom are f ₁ , f ₂ , and f ₃ respectively, and satisfy f ₁ <f ₂ <f ₃ .

Further, the number of relays in the relay switch module is 3, and the relays are respectively connected with transducers whose center frequencies are f ₁ , f ₂ , and f ₃ .

Further, the funnel is connected with the fixed support through bolts, and the bolts are covered with springs.

Further, the transducer is a piezoelectric transducer.

Compared with the prior art, the present invention has the following significant advantages: 1) the present invention can remove dust with a certain humidity, and the dust removal is comprehensive; 2) the present invention utilizes a control circuit to automatically control multiple groups of transducers with variable frequency vibration and dust removal, and the degree of automation higher, the labor intensity of workers is reduced, and the production cost is reduced; 3) the frequency conversion vibration of the present invention has low energy consumption and saves electric energy.

The present invention will be described in further detail below with reference to the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention.

FIG. 2 is a schematic diagram of a control circuit according to an embodiment of the present invention.

Figure 3 is a waveform diagram of the output current of the multi-frequency ultrasonic generator.

The meanings of the symbols in the figure are:

1-multi-frequency ultrasonic power supply, 2-piezoelectric transducer, 3-funnel, 4-bolt, 5-spring, 6-fixed support, 11-touch screen controller, 12-control circuit, 13-rectifier filter circuit , 14-DC chopper circuit, 15-full-bridge inverter circuit, 16-transformer, 17-relay switch module, 121-DSP chip, 122-DDS digital frequency synthesizer.

Detailed ways

As shown in Figure 1, a transducer-based variable frequency vibration dust removal device of the present invention includes a multi-frequency ultrasonic generator 1, a funnel 3 and two or more sets of transducers 2, wherein:

The funnel 3 is elastically connected to the fixed support 6, and more than two sets of transducers 2 are arranged on the funnel 3, and each set of transducers includes two transducers 2 with the same center frequency and symmetrically distributed on the surface of the funnel 3, and Different groups of transducers have different center frequencies, and the transducers 2 are equally spaced from top to bottom on the surface of the funnel 3;

The input port of each transducer 2 is connected to the output port of the multi-frequency ultrasonic generator 1 and works under the control of the multi-frequency ultrasonic generator 1 .

Further, the multi-frequency ultrasonic generator 1 includes a rectification filter circuit 13, a DC chopper circuit 14, a full-bridge inverter circuit 15, a transformer 16, a relay switch module 17, a touch screen controller 11 and a control circuit 12, wherein:

The rectifier filter circuit 13, the DC chopper circuit 14, the full-bridge inverter circuit 15, the transformer 16, and the relay switch module 17 are connected in sequence;

The control circuit 12 is connected to the DC chopper circuit 14 for controlling the duty cycle of the DC chopper circuit 14; the control circuit 12 is connected to the full-bridge inverter circuit 15 for controlling the output of a signal of a specific frequency; The control circuit 12 is connected to the relay switch module 17 for controlling the work of the transducer 2 corresponding to the center frequency;

The touch screen controller 11 is connected to the control circuit 12 for manually setting the working time of the transducer 2 .

Further, the control circuit 12 includes a DSP chip 121 and a DDS digital frequency synthesizer 122 connected to the DSP chip 121. The DSP chip 121 is connected to the DC chopper circuit 14 through PWM soft switch control, and the DDS digital frequency synthesizer is The output terminal of the converter 122 is connected to the full-bridge inverter circuit 15 .

Further, the number of the transducers 2 is three groups.

Further, the center frequencies of each group of the transducers 2 from top to bottom are f ₁ , f ₂ , and f ₃ respectively, and satisfy f ₁ <f ₂ <f ₃ .

Further, the relay switch module has three relays, and the relays are respectively connected to the transducers 2 with center frequencies f ₁ , f ₂ , and f ₃ .

Further, the funnel 3 is connected to the fixed support 6 by means of bolts 4 , and the bolts 4 are covered with springs 5 .

A more detailed description will be given below in conjunction with the embodiments.

Example 1

1, according to an embodiment of the present invention, a frequency conversion vibration dust removal device based on a transducer 2, a multi-frequency ultrasonic generator 1, a funnel 3 and two or more sets of transducers 2, wherein the multi-frequency ultrasonic generator 1 The output port is electrically connected to the input port of the transducer 2, and each group of transducers 2 includes two transducers 2 with the same center frequency and symmetrically distributed on the surface of the funnel 3, and different groups of transducers 2 have different center frequencies and It is distributed on the surface of the funnel 3 at equal intervals from top to bottom, and the funnel 3 is elastically connected to the fixed support 6 .

In this embodiment, the number of groups of transducers 2 is three, and the center frequencies of the three groups of transducers 2 from top to bottom are f ₁ , f ₂ , and f ₃ respectively, and satisfy f ₁ <f ₂ <f ₃ .

1, the multi-frequency ultrasonic generator 1 includes a rectifier filter circuit 13, a DC chopper circuit 14, a full-bridge inverter circuit 15, a transformer 16, and a relay switch module 17, which are connected in sequence. The control circuit 12 connected to the inverter circuit 15 and the relay switch module 17 , and the touch screen controller 11 connected to the control circuit 12 . The output end of the relay switch module 17 is used as the output end of the multi-frequency ultrasonic wave to be connected to the input ports of the piezoelectric transducers 2 with different center frequencies respectively. The relay switch module includes 3 relays, and the 3 relays are respectively connected to the three groups of transducers 2 . On the one hand, the control circuit 12 controls the duty cycle of the DC chopper circuit 14, so that the DC chopper circuit 14 outputs a voltage with a specific amplitude; on the other hand, the control circuit 12 controls the full-bridge inverter circuit 15 to output a signal with a specific frequency . At the same time, the relays connected to the two groups of transducers corresponding to the center frequency are controlled to be turned on, so as to control the operation of the transducers 2 matched with the output frequency.

1, in this embodiment, the transducer 2 is a piezoelectric transducer 2; the funnel 3 is connected to the fixed support 6 through a bolt 4, and the bolt 4 is covered with a spring 5 to prevent the transducer 2 from working When the fixed support 6 and the funnel 3 are damaged.

Referring to FIG. 1 , after the commercial power passes through the rectifier and filter circuit 13 , it outputs a DC power with a specified voltage value, and the DC power enters the DC chopper circuit 14 . The high-power direct current in the circuit 15 is converted into high-power alternating current. After the high-power alternating current passes through the transformer 16, the required excitation power is output. The control circuit 12 is connected to the DC chopper circuit 14 and the full-bridge inverter circuit 15, so as to control the multi-frequency ultrasonic generator 1 to output alternating current with a specific amplitude and frequency. At the same time, the control circuit 12 is connected to the relay switch module to control the relay corresponding to the relay switch module 17 to conduct, thereby driving the transducer 2 matching the output frequency to generate ultrasonic waves to drive the funnel 3 to vibrate, thereby achieving the effect of frequency conversion vibration and dust removal.

1 and 2, the control circuit is mainly composed of a DSP chip 121, a DDS digital frequency synthesizer 122 and corresponding peripheral circuits. After the touch screen controller 11 inputs the working time, within the corresponding period, the DSP chip 121 controls the DC chopper circuit 14 to output a voltage with a specific amplitude by controlling the duty cycle of the output PWM wave, and on the other hand, by controlling the SPI The module sends a frequency signal to the DDS digital frequency synthesizer 122, and the DDS digital frequency synthesizer 122 controls the full-bridge inverter circuit 15 to output a high-voltage high-frequency signal of a corresponding frequency, and then passes through the transformer 16 to obtain a sine wave signal with a specific frequency and amplitude. At this time, the DSP chip 121 controls the on-off of the corresponding relay switch in the relay switch module 17 through the general I/O port, thereby driving the corresponding piezoelectric transducer to generate ultrasonic waves to drive the funnel 3 to vibrate. In other corresponding time periods, the DSP chip 121 sequentially controls the corresponding circuits to generate sine wave signals of other frequencies and amplitudes, and then sequentially drives other groups of piezoelectric transducers to generate ultrasonic waves to drive the funnel 3 to vibrate, and finally achieve the effect of variable frequency vibration and dust removal.

As shown in Fig. 1 and Fig. 3, the multi-frequency drive power supply outputs alternating current of three frequencies in one working cycle. The output time of the three frequencies f ₁ , f ₂ and f ₃ is manually set by the touch screen controller 11 . During the _t1 period, the alternating current with the output frequency f1 drives the transducer ₂ with the center frequency f1 to work _; during the _t2 period, the alternating current with the output frequency f2 _{drives the transducer 2 with} the center frequency f2 to work ; During the period of t ₃ , the alternating current with the output frequency of f ₃ drives the transducer 2 with the center frequency of f ₃ to work.

Therefore, the transducer-based variable frequency vibration dust removal device disclosed in the present invention can realize variable frequency vibration, reduce energy consumption, save electric energy, and avoid damage to the funnel itself caused by long-term one frequency vibration while achieving better dust removal effect. Moreover, the device has a high degree of automation, which reduces the labor intensity of workers.

Claims (6)

1. a frequency conversion vibration dust removal device based on transducer, is characterized in that, comprises multi-frequency ultrasonic generator (1), funnel (3) and more than two groups of transducers (2), wherein: The funnel (3) is elastically connected to the fixed support (6), and more than two sets of transducers (2) are arranged on the funnel (3). 3) The transducers (2) on the surface, and different groups of transducers have different center frequencies, and the transducers (2) are equally spaced from top to bottom on the surface of the funnel (3); The input port of each transducer (2) is connected to the output port of the multi-frequency ultrasonic generator (1), and works under the control of the multi-frequency ultrasonic generator (1); The number of the transducers (2) is three groups, and the center frequencies of each group from top to bottom are respectively f ₁ , f ₂ and f ₃ , and satisfy f ₁ <f ₂ <f ₃ . 2. The transducer-based variable frequency vibration dust removal device according to claim 1, wherein the multi-frequency ultrasonic generator (1) comprises a rectifier filter circuit (13), a DC chopper circuit (14), a full A bridge inverter circuit (15), a transformer (16), a relay switch module (17), a touch screen controller (11) and a control circuit (12), wherein: The rectifier filter circuit (13), the DC chopper circuit (14), the full-bridge inverter circuit (15), the transformer (16), and the relay switch module (17) are connected in sequence; The control circuit (12) is connected to the DC chopper circuit (14) for controlling the duty cycle of the DC chopper circuit (14); the control circuit (12) is connected to the full-bridge inverter circuit (15), used to control the output of a signal of a specific frequency; the control circuit (12) is connected to the relay switch module (17) for controlling the work of the transducer (2) corresponding to the center frequency; The touch screen controller (11) is connected with the control circuit (12) and is used for manually setting the working time of the transducer (2). 3. The transducer-based variable frequency vibration dust removal device according to claim 2, wherein the control circuit (12) comprises a DSP chip (121) and a DDS digital frequency synthesizer connected with the DSP chip (121) (122), the DSP chip (121) is connected to the DC chopper circuit (14) through PWM soft switching control, and the output end of the DDS digital frequency synthesizer (122) is connected to the full-bridge inverter circuit (15). 4 . The transducer-based variable frequency vibration dust removal device according to claim 2 , wherein the number of relays of the relay switch module is 3, and the relays and the center frequencies are respectively f ₁ , f ₂ , The transducer (2) of f ₃ is connected. 5 . The transducer-based variable frequency vibration dust removal device according to claim 1 , wherein the funnel ( 3 ) is connected to the fixed support ( 6 ) through bolts ( 4 ), and the bolts ( 4 ) are on the The sleeve has a spring (5). 6 . The transducer-based variable frequency vibration dust removal device according to claim 1 , wherein the transducer ( 2 ) is a piezoelectric transducer. 7 .

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