Multi-channel control circuit and control method for piezoelectric vibration machinery

Abstract

The present invention belongs to the technical field of mechanical vibration, and specifically relates to a multi-channel control circuit for a piezoelectric vibration machine and a control method thereof, wherein the multi-channel control circuit for a piezoelectric vibration machine comprises: a vibration sensor, a control module and a multi-channel signal processing module; the control module is electrically connected to the vibration sensor and the signal processing module respectively; the vibration sensor is configured to obtain the vibration state information of the vibration machine, and send the vibration state information to the control module; the control module is configured to obtain a control signal based on the received vibration state information, and send the control signal to the corresponding vibration source of the vibration machine through the multi-channel signal processing module to adjust the vibration of the vibration source. The vibration state is monitored in real time by the vibration sensor, the vibration is uniformly adjusted by the control module, and the control signal is transmitted to multiple vibration sources through the multi-channel signal processing module, so as to automatically adjust the voltage and frequency, and then realize automatic speed stabilization.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical vibration, and specifically relates to controlling mechanical vibration, and in particular to a multi-channel control circuit for a piezoelectric vibration machine and a control method thereof. Background Art

[0002] With the continuous improvement of industrial automation, the vibration feeder controller, as an important part of the automated production line, is also constantly improving its technology. From the initial mechanical control to the later electronic control, and then to today's digital frequency conversion control technology, the performance of the vibration feeder controller has been continuously improved and its functions have become more complete. The working principle of the vibration feeder controller is mainly based on vibration mechanics and electronic control technology. It achieves precise control of the vibration feeding process by changing the frequency and voltage amplitude of the working power supply of the coil of the vibration feeder plate (or other vibration structure).

[0003] The vibration feeding control in the related art is generally controlled at a fixed voltage and frequency, and the voltage and frequency of the controller need to be manually adjusted. It is impossible to automatically adjust the voltage and frequency to adjust the vibration speed of the feeder according to the actual operating conditions. At the same time, the one-to-one control of the drive of a single part of the feeder cannot be synchronized and adjusted uniformly on multiple controllers, and the stability of the feeder's vibration cannot be guaranteed.

[0004] Therefore, how to synchronously adjust the vibrations of multiple vibration sources of the feeder to ensure the steady speed of the vibration machinery is an urgent problem to be solved.

[0005] It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the invention

[0006] The embodiments of the present disclosure at least provide a multi-channel control circuit for a piezoelectric vibration machine and a control method thereof.

[0007] In a first aspect, an embodiment of the present disclosure provides a multi-channel control circuit for a piezoelectric vibration machine, comprising:

[0008] Vibration sensor, control module and multi-channel signal processing module;

[0009] The control module is electrically connected to the vibration sensor and the signal processing module respectively;

[0010] The vibration sensor is configured to obtain vibration state information of the vibration machine and send the vibration state information to the control module;

[0011] The control module is configured to obtain a control signal according to the received vibration state information, and send the control signal to the corresponding vibration source of the vibration machine after shaping through the multi-channel signal processing module to adjust the vibration of the vibration source.

[0012] In an optional implementation, the signal processing module includes:

[0013] Analog-to-electric conversion unit, amplification unit and filtering unit;

[0014] The analog-to-electric conversion unit, the amplification unit and the filtering unit are electrically connected in sequence;

[0015] The analog-to-electric conversion unit is configured to convert the control signal sent by the control module into an analog signal and transmit it to the amplification unit. The analog signal is amplified by the amplification unit and filtered by the filtering unit in turn and then transmitted to the vibration source.

[0016] In an optional implementation, the amplification unit includes an amplification chip U22;

[0017] The output terminal VOUT of the analog-to-electric conversion unit is electrically connected to the input terminal INP of the amplifier chip U22 through the capacitor C118.

[0018] In an optional implementation, the amplifier chip U22 further includes a first feedback pin FAULT and a second feedback pin MUTE;

[0019] The first feedback pin FAULT is electrically connected to the control module through the switch tube Q11;

[0020] The second feedback pin MUTE is electrically connected to the control module through the switch tube Q10;

[0021] The amplifier chip U22 is configured to send an error signal to the control module through a first feedback pin FAULT and a second feedback pin MUTE.

[0022] In an optional implementation, the multi-channel control circuit for the piezoelectric vibration machine further includes a power module;

[0023] The power supply module is suitable for supplying power to a multi-channel control circuit for a piezoelectric vibration machine.

[0024] In an optional implementation, the multi-channel control circuit for a piezoelectric vibration machine further includes a communication module;

[0025] The control module is connected to the host computer through the communication module.

[0026] In an optional implementation, the number of the signal processing modules is 2n, where n is the same as the number of vibration sources;

[0027] The two signal processing modules are divided into a group, and each group of signal processing modules is electrically connected to a vibration source.

[0028] In an optional implementation, the control signal is divided into a first signal and a second signal, and is respectively sent to a corresponding vibration source through a corresponding signal processing module;

[0029] The voltage and frequency of the first signal and the second signal are the same, and one of the signal processing modules in each group of the signal processing modules shapes the peaks and troughs of the second signal, and the other signal processing module shapes the remaining bands of the waveform of the first signal.

[0030] In an optional implementation, the multi-channel control circuit for the piezoelectric vibration machine further includes m sub-control modules;

[0031] The output end of each group of the signal processing modules is electrically connected to the sub-control module;

[0032] The sub-control module is configured to adjust the vibration of the vibration source after splicing the first signal and the second signal.

[0033] In an optional implementation, the step of adjusting the vibration of the vibration source after splicing the first signal and the second signal is:

[0034] Acquire a first signal and a second signal;

[0035] Divide the first signal and the second signal into N bands in the same period;

[0036] Obtaining the band where the abnormal point in the first signal is located according to wavelet analysis;

[0037] Eliminate the band where the abnormal point in the first signal is located, and retain the first normal segment waveform;

[0038] Acquire the bands corresponding to the abnormal points in the second signal and the first signal to obtain a second normal segment waveform, and arrange the first normal segment waveform and the second normal segment waveform in a band order to obtain a splicing order;

[0039] The first signal and the second signal are controlled in a splicing order to be alternately connected to the vibration source according to the timing of the first and second normal segment waveforms to adjust the vibration of the vibration source.

[0040] In a second aspect, the embodiments of the present disclosure further provide a control method for the multi-channel control circuit for a piezoelectric vibration machine as described above, the control method comprising:

[0041] Obtaining vibration status information of vibrating machinery through vibration sensors;

[0042] obtaining a control signal according to the vibration state information;

[0043] The control signal is shaped and sent to the corresponding vibration source through a multi-channel signal processing module;

[0044] The vibrations of the multiple vibration sources are adjusted according to the control signal.

[0045] The beneficial effect of the present invention is that the multi-channel control circuit and control method for the piezoelectric vibration machinery monitors the vibration state in real time through the vibration sensor, uniformly adjusts the vibration through the control module, and shapes the control signal through the multi-channel signal processing module and transmits it to multiple vibration sources, thereby automatically adjusting the voltage and frequency, and then achieving automatic speed stabilization.

[0046] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, this article specifically cites preferred embodiments and provides detailed descriptions as follows in conjunction with the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 A control principle block diagram of a multi-channel control circuit for a piezoelectric vibration machine provided in an embodiment of the present disclosure.

[0050] Figure 2 A circuit diagram of a control module provided in an embodiment of the present disclosure.

[0051] Figure 3 A circuit diagram of a signal processing module provided in an embodiment of the present disclosure.

[0052] Figure 4 Waveform diagrams of the first signal and the second signal provided in the embodiment of the present disclosure.

[0053] Figure 5A circuit diagram of a power module provided in an embodiment of the present disclosure.

[0054] Figure 6 A circuit diagram of a communication module provided in an embodiment of the present disclosure.

[0055] Figure 7 This is a flow chart of a control method for a multi-channel control circuit for a piezoelectric vibration machine provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0058] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0059] See also Figure 1 , Figure 1 The principle block diagram of a multi-channel control circuit for a piezoelectric vibration machine is shown, wherein the multi-channel control circuit for a piezoelectric vibration machine includes: a vibration sensor, a control module and a multi-channel signal processing module; the control module is electrically connected to the vibration sensor and the signal processing module respectively; the vibration sensor is configured to obtain the vibration state information of the vibration machine and send the vibration state information to the control module; the control module is configured to obtain a control signal according to the received vibration state information, and send the control signal to the corresponding vibration source of the vibration machine after shaping through the multi-channel signal processing module to adjust the vibration of the vibration source. The vibration state is monitored in real time through the vibration sensor, the vibration is uniformly adjusted through the control module, and the control signal is transmitted to multiple vibration sources through the multi-channel signal processing module, so as to automatically adjust the voltage and frequency, thereby achieving automatic speed stabilization.

[0060] In some embodiments, the circuit diagram of the control module is as follows Figure 2As shown. Among them, U4 is the main control chip, which interacts with the external display module through serial communication to realize the control of the display module. P1, resistor R4, and capacitor C8 form the program burning circuit of the main control chip U4, and together with the crystal oscillator and the crystal oscillator's start-up capacitor, they form the minimum system of the main control chip U4. In addition, C10, C11, C9, and C14 are used as decoupling capacitors to filter the main control chip U4. Among them, the model of the main control chip U4 is STM32F47VET6.

[0061] See also Figure 3 In some embodiments, the signal processing module includes: an analog-to-electric conversion unit, an amplifying unit and a filtering unit; the analog-to-electric conversion unit, the amplifying unit and the filtering unit are electrically connected in sequence; the analog-to-electric conversion unit is configured to convert the control signal sent by the control module into an analog signal and transmit it to the amplifying unit, and the analog signal is amplified by the amplifying unit and filtered by the filtering unit in sequence and then transmitted to the vibration source.

[0062] The model of the conversion chip U21 of the analog-to-electrical conversion unit is TPC114S1.

[0063] The amplifier unit includes an amplifier chip U22; the output terminal VOUT of the analog-to-electric conversion unit is electrically connected to the input terminal INP of the amplifier chip U22 through the capacitor C118. The model of the amplifier chip U22 is TPA3110D2PWPR.

[0064] In a preferred embodiment, the amplifier chip U22 further includes a first feedback pin FAULT and a second feedback pin MUTE; the first feedback pin FAULT is electrically connected to the control module through the switch tube Q11; the second feedback pin MUTE is electrically connected to the control module through the switch tube Q10; the amplifier chip U22 is configured to send an error signal to the control module through the first feedback pin FAULT and the second feedback pin MUTE. The error information of the control signal is fed back through the first feedback pin FAULT and the second feedback pin MUTE, which is used to monitor the multi-channel control circuit for the electric vibration machinery and alarm for faults.

[0065] Please continue reading Figure 1 In a preferred embodiment, the number of the signal processing modules is 2n, where n is the same as the number of vibration sources; two of the signal processing modules are grouped together, and each group of signal processing modules is electrically connected to one vibration source.

[0066] The control signal is divided into a first signal and a second signal, and is sent to the corresponding vibration source through the corresponding signal processing module respectively; the voltage and frequency of the first signal and the second signal are the same, and one of the signal processing modules in each group of the signal processing modules shapes the peaks and troughs of the second signal, and the other signal processing module shapes the remaining bands of the waveform of the first signal. The waveform diagram of the first signal and the second signal is as follows Figure 4 As shown, the first signal and the second signal divide the waveform within one cycle into N segments, the first signal transmits the waveform of some segments with high precision, and the other segment is transmitted with high precision in the second signal. Since the waveform is affected by noise interference, loss and other problems during the signal transmission process, abnormal points appear. Therefore, the signal is divided into two parts, one for high-precision transmission, and the other for error redundancy, that is, the influence of the waveform caused by noise interference, loss, quality control errors in the production process, production errors of components, installation errors of workers and subsequent circuit board maintenance is controlled in the part that is not transmitted with high precision, thereby ensuring the integrity of the waveform of the high-precision transmission part.

[0067] It should be noted that since the components of the multi-channel control circuits for piezoelectric vibration machinery produced in the same batch come from different manufacturers, the signal waveform is interfered with in different places. Therefore, by adopting high-precision transmission of part of the signal band, various errors and interferences are controlled in another part. The dual-signal transmission method is adopted to convert different bands in a targeted manner, and the high-precision transmission parts of the two signals are spliced ​​to ensure that the vibration source can receive the most complete waveform possible, thereby improving the accuracy of control.

[0068] In order to splice the dual signals, at the vibration source, the multi-channel control circuit for the piezoelectric vibration machinery also includes m sub-control modules; the output end of each group of the signal processing modules is electrically connected to the sub-control module; the sub-control module is configured to adjust the vibration of the vibration source after splicing the first signal and the second signal.

[0069] The step of adjusting the vibration of the vibration source after splicing the first signal and the second signal is:

[0070] S110: Acquire a first signal and a second signal.

[0071] S120: Divide the first signal and the second signal into N bands in the same period.

[0072] S130: Obtain the band where the abnormal point in the first signal is located according to wavelet analysis.

[0073] Specifically, the abnormal point in the first signal is firstly extracted by wavelet analysis, and then the band in which the abnormal point is located within the period of the first signal is calculated through the time axis of the first signal.

[0074] S140: Eliminate the band where the abnormal point in the first signal is located, and retain the first normal segment waveform.

[0075] S150: Acquire the bands corresponding to the abnormal points in the second signal and the first signal to obtain a second normal segment waveform, and arrange the first normal segment waveform and the second normal segment waveform in a band order to obtain a splicing order.

[0076] S160: Control the first signal and the second signal according to the splicing order to be alternately connected to the vibration source according to the timing of the first and second normal segment waveforms, and adjust the vibration of the vibration source.

[0077] The first signal, the second signal and the spliced ​​waveform are as follows Figure 4 As shown, in the same cycle, the first signal and the second signal are controlled in the splicing order to be alternately connected to the vibration source according to the timing of the first and second normal segment waveforms to adjust the vibration of the vibration source. This ensures the integrity of the control waveform received by the vibration source, improves the vibration control accuracy of the vibration source, further ensures the stability of the vibration, and realizes automatic speed stabilization. In some embodiments, the multi-channel control circuit for piezoelectric vibration machinery also includes a power module; the power module is suitable for supplying power to the multi-channel control circuit for piezoelectric vibration machinery.

[0078] See also Figure 5 , the power module is +24V input, diode D6 and varistor MOV are surge protection devices; diode D1 is added to the circuit as a reverse connection protection for the power module to avoid damage to the entire circuit due to improper operation of the positive and negative poles of the power supply. Capacitor C30 and capacitor C27 play a filtering role. Voltage conversion chip U1 is a 24V to 5V DCDC chip, which uses resistors R2 and R3 to ensure the stability of the output 5V; diode D8 is a power indicator; chip U8 is a linear LDO regulator, which converts from 5V to 3.3V, and capacitors are added to the front and back ends of chip U8 for filtering. Among them, the model of voltage conversion chip U1 is TPS5430DDAR.

[0079] In some embodiments, the multi-channel control circuit for a piezoelectric vibration machine further includes a communication module; the control module is communicatively connected with a host computer via the communication module.

[0080] The circuit diagram of the communication module is as follows Figure 6As shown. Chip U7 is a 485 data conversion chip, model MAX485ESA, which is used to realize data interaction between the control module and the host computer. Diode D2 and diode D5 are differential protector devices to prevent strong interference signals from affecting the data. Resistor R13 is the matching resistor between the two data lines. In addition, pull-up resistor R29 and pull-down resistor R21 are added to the two data lines to prevent the data from being in an uncertain state.

[0081] At least one embodiment also provides a control method for a multi-channel control circuit for a piezoelectric vibration machine as described above, which monitors the vibration state in real time through a vibration sensor, uniformly adjusts the vibration through a control module, and transmits the control signal to multiple vibration sources through a multi-channel signal processing module, thereby automatically adjusting the voltage and frequency, and then achieving automatic speed stabilization.

[0082] See also Figure 7 Specifically, the method comprises the following steps:

[0083] S210: Acquiring vibration state information of the vibration machine through a vibration sensor;

[0084] S220: Acquire a control signal according to the vibration state information;

[0085] S230: shaping the control signal through the multi-channel signal processing module and sending it to the corresponding vibration source;

[0086] S240: Adjust the vibrations of the multiple vibration sources according to the control signal.

[0087] Specifically, the control signal includes a first signal and a second signal, and adjusting the vibrations of the multiple vibration sources according to the control signal is achieved through the above-mentioned steps S110-S150.

[0088] In summary, the present invention provides a multi-channel control circuit for a piezoelectric vibration machine and a control method thereof, wherein the multi-channel control circuit for a piezoelectric vibration machine includes: a vibration sensor, a control module and a multi-channel signal processing module; the control module is electrically connected to the vibration sensor and the signal processing module respectively; the vibration sensor is configured to obtain the vibration state information of the vibration machine and send the vibration state information to the control module; the control module is configured to obtain a control signal based on the received vibration state information, and send the control signal to the corresponding vibration source of the vibration machine through the multi-channel signal processing module to adjust the vibration of the vibration source. The vibration state is monitored in real time by the vibration sensor, the vibration is uniformly adjusted by the control module, and the control signal is transmitted to multiple vibration sources through the multi-channel signal processing module, so as to automatically adjust the voltage and frequency, thereby achieving automatic speed stabilization.

[0089] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A multi-channel control circuit for a piezoelectric vibration machine, characterized in that: include: Vibration sensor, control module and multi-channel signal processing module; The control module is electrically connected to the vibration sensor and the signal processing module respectively; The vibration sensor is configured to obtain vibration state information of the vibration machine and send the vibration state information to the control module; The control module is configured to obtain a control signal according to the received vibration state information, and send the control signal to the corresponding vibration source of the vibration machine after shaping through the multi-channel signal processing module to adjust the vibration of the vibration source; The number of the signal processing modules is 2n, where n is the same as the number of vibration sources; The two signal processing modules are divided into one group, and each group of signal processing modules is electrically connected to one vibration source; The control signal is divided into a first signal and a second signal, and is sent to a corresponding vibration source through a corresponding signal processing module respectively; The voltage and frequency of the first signal and the second signal are the same, and one of the signal processing modules in each group of the signal processing modules shapes the peaks and troughs of the second signal, and the other signal processing module shapes the remaining bands of the waveform of the first signal; The multi-channel control circuit for piezoelectric vibration machinery also includes m sub-control modules; The output end of each group of the signal processing modules is electrically connected to the sub-control module; The sub-control module is configured to adjust the vibration of the vibration source after splicing the first signal and the second signal; The step of adjusting the vibration of the vibration source after splicing the first signal and the second signal is: Acquire a first signal and a second signal; Divide the first signal and the second signal into N bands in the same period; Obtaining the band where the abnormal point in the first signal is located according to wavelet analysis; Eliminate the band where the abnormal point in the first signal is located, and retain the first normal segment waveform; Acquire the bands corresponding to the abnormal points in the second signal and the first signal to obtain a second normal segment waveform, and arrange the first normal segment waveform and the second normal segment waveform in a band order to obtain a splicing order; The first signal and the second signal are controlled in a splicing order to be alternately connected to the vibration source according to the timing of the first and second normal segment waveforms to adjust the vibration of the vibration source.

2. The multi-channel control circuit for a piezoelectric vibration machine according to claim 1, characterized in that: The signal processing module comprises: Analog-to-electric conversion unit, amplification unit and filtering unit; The analog-to-electric conversion unit, the amplification unit and the filtering unit are electrically connected in sequence; The analog-to-electric conversion unit is configured to convert the control signal sent by the control module into an analog signal and transmit it to the amplification unit. The analog signal is amplified by the amplification unit and filtered by the filtering unit in turn and then transmitted to the vibration source.

3. The multi-channel control circuit for a piezoelectric vibration machine according to claim 2, characterized in that: The amplification unit includes an amplification chip U22; The output terminal VOUT of the analog-to-electric conversion unit is electrically connected to the input terminal INP of the amplifier chip U22 through the capacitor C118.

4. The multi-channel control circuit for a piezoelectric vibration machine according to claim 3, characterized in that: The amplifier chip U22 also includes a first feedback pin and a second feedback pin; The first feedback pin is electrically connected to the control module via the switch tube Q11; The second feedback pin is electrically connected to the control module via the switch tube Q10; The amplifier chip U22 is configured to send an error signal to the control module through a first feedback pin and a second feedback pin.

5. The multi-channel control circuit for a piezoelectric vibration machine according to claim 1, characterized in that: The multi-channel control circuit for piezoelectric vibration machinery also includes a power supply module; The power supply module is suitable for supplying power to a multi-channel control circuit for a piezoelectric vibration machine.

6. The multi-channel control circuit for a piezoelectric vibration machine according to claim 1, characterized in that: The multi-channel control circuit for piezoelectric vibration machinery also includes a communication module; The control module is connected to the host computer through the communication module.

7. A control method for a multi-channel control circuit for a piezoelectric vibration machine according to any one of claims 1 to 6, characterized in that: The control method comprises: Obtaining vibration status information of vibrating machinery through vibration sensors; obtaining a control signal according to the vibration state information; The control signal is shaped and sent to the corresponding vibration source through a multi-channel signal processing module; The vibrations of the multiple vibration sources are adjusted according to the control signal.

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