A non-contact electromagnetic detection device for detecting residual liquid in a bottle

Abstract

The application provides a non-contact electromagnetic detection device for detecting residual liquid in a bottle, which comprises a transmitting end and a receiving end. The transmitting end is connected with a transmitting antenna, and high-frequency electromagnetic pulses are transmitted through the transmitting antenna. The receiving end is connected with a receiving antenna, and the signal transmitted by the transmitting end and penetrating the bottle is received through the receiving antenna. The receiving end is also provided with a data processing module and a control module. The data processing module is configured to receive the signal fed back by the receiving antenna, output an analog signal to the control module through the data processing module, and give a judgment result based on the received analog signal. The electromagnetic detection device meets the requirements of a high-speed filling production line.

Description

Technical Field

[0001] This application relates to the field of detection technology, and specifically to a non-contact electromagnetic detection device for detecting residual liquid in a bottle. Background Technology

[0002] In the industrial production of beverages, empty bottle inspection is an essential and critical step before bottling. Traditional inspection technologies mainly include mechanical contact, optical, and ultrasonic methods, but all have significant technical limitations. Mechanical contact inspection, which uses weighing or probe contact, is simple in structure but slow and cannot meet the inspection needs of high-speed production lines that process more than 600 bottles per minute. More importantly, prolonged contact between mechanical parts and liquids can easily lead to corrosion and contamination, especially when detecting alkaline cleaning agent residues. Optical inspection technology uses CCD cameras or infrared sensors for visual recognition. Although it achieves non-contact inspection, it requires high bottle transparency and is easily affected by labels, water stains, and foam, resulting in a high false detection rate in practical applications. Ultrasonic inspection technology uses the principle of sound wave reflection. Although it overcomes the limitation of transparency, its detection accuracy is significantly affected by ambient temperature, and foam inside the bottle can cause sound wave scattering, generating erroneous signals. Summary of the Invention

[0003] To overcome the above-mentioned shortcomings, the purpose of this application is to propose a non-contact electromagnetic detection device for detecting residual liquid in bottles, so as to improve the detection accuracy.

[0004] To achieve the above objectives, this application adopts the following technical solution: A non-contact electromagnetic detection device for detecting residual liquid in a bottle, comprising: Transmitter and receiver, The transmitting end is connected to a transmitting antenna, through which high-frequency electromagnetic pulses are transmitted; The receiving end is connected to a receiving antenna, which receives the signal transmitted by the transmitting end that penetrates the bottle. The receiving end is also equipped with a data processing module and a control module. The data processing module is configured to receive the signal fed back from the receiving antenna, output an analog signal to the control module, and the control module provides a judgment result based on the received analog signal. High-frequency electromagnetic waves with a frequency between 1MHz and 1GHz are transmitted through the transmitting antenna.

[0005] Preferably, the bottle body is made of glass or plastic.

[0006] Preferably, the data processing module is configured to receive the signal fed back by the receiving antenna, pass it through filtering, detection, and amplification circuits, and output a 4-20mA analog signal.

[0007] Preferably, in this electromagnetic detection device, the root mean square value is obtained by performing root mean square calculation on the filtered waveform based on the detection circuit, and the voltage value is output.

[0008] Preferably, the electromagnetic detection device amplifies the voltage using an amplifier circuit and outputs the amplified voltage to an analog output circuit.

[0009] Preferably, the analog output circuit includes an XTR111 chip.

[0010] Preferably, the control module is a PLC module. Beneficial effects

[0011] Compared with existing technologies, the electromagnetic detection device proposed in this application adopts high-frequency electromagnetic field fusion online detection technology. Through the design of the data processing module, it achieves a detection sensitivity of 1 mL for trace residual liquid. The detection response time is controlled within 2 ms, which can support the needs of ultra-high-speed production lines of 800 bottles / minute and meet the detection requirements of modern high-speed filling lines. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the electromagnetic detection device for detecting a bottle according to an embodiment of this application; Figure 2 This is a schematic diagram illustrating the processing of a signal received by the receiving end in an embodiment of this application; Figure 3 This is a topological diagram of the filtering circuit, detection circuit, and amplification circuit in the data processing module of this application embodiment; Figure 4 This is a schematic diagram of the topology of the analog output circuit in the data processing module of this application embodiment. Detailed Implementation

[0013] The above-described solution will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of this application. The implementation conditions used in the embodiments may be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are generally those in routine experiments.

[0014] As mentioned in the background section, empty bottle inspection is an essential and crucial step in the industrial production of beverages before bottling. Traditional inspection technologies mainly include mechanical contact, optical, and ultrasonic methods, but all have significant technical limitations. Currently, common inspection solutions on the market include: 1. Capacitive liquid detection devices, but these lack sensitivity for low-conductivity liquids (such as water); 2. Multi-frequency ultrasonic detection solutions, which improve detection accuracy but significantly increase system complexity and cost. In the beverage industry, especially in bottled water, carbonated beverages, and beer production lines, it is necessary to detect both residual alkaline cleaning agents after washing and to distinguish trace amounts of water residue, which places higher demands on inspection technology.

[0015] Based on this, the applicant proposes a new detection technology that meets the ever-increasing requirements of food safety production standards while being non-contact, high-precision, high-speed, and cost-controllable.

[0016] The applicant proposes a non-contact electromagnetic detection device for detecting residual liquid in bottles. This non-contact device, based on electromagnetic detection technology, is used to detect residual liquids in bottles, including water and alkaline solutions. It offers high detection accuracy and is suitable for production line speeds exceeding 600 bottles / minute. In one embodiment, the detection response time is controlled within 2ms, supporting ultra-high-speed production line requirements of 800 bottles / minute.

[0017] The following describes in detail, with reference to the accompanying drawings, a non-contact electromagnetic detection device (hereinafter referred to as the electromagnetic detection device) for detecting residual liquid in a bottle, according to an embodiment of this application. This electromagnetic detection device achieves a detection sensitivity of 1 mL for trace amounts of residual liquid.

[0018] The electromagnetic detection device includes a transmitter and a receiver. The transmitter is connected to a transmitting antenna, which transmits high-frequency electromagnetic pulses (such as high-frequency electromagnetic waves of 1MHz - 1GHz). The receiver is connected to a receiving antenna, which receives the signal transmitted by the transmitter that penetrates the bottle. The receiver is equipped with a data processing module and a control module. The received signal is processed by the data processing module and outputs an analog signal. The control module provides a judgment result based on the received analog signal, such as whether the bottle is empty, contains water, or contains alkali. This electromagnetic detection device uses the difference in liquid conductivity and dielectric constant to distinguish between empty bottles, water, and alkali residue (sensitivity ≤0.5mL). The bottle is made of glass or plastic. In this embodiment, the transmitting and receiving antennas are rectangular, preferably with dimensions of 40-50mm * 20-30mm. For example, a rectangle measuring 45mm x 26mm.

[0019] like Figure 1The diagram shown is a schematic of an electromagnetic detection device detecting a bottle. The electromagnetic detection device includes a transmitter and a receiver. The transmitter 10 is connected to the transmitting antenna 20, which transmits high-frequency electromagnetic pulses (such as high-frequency electromagnetic waves of 1MHz - 1GHz). The receiver 40 is connected to the receiving antenna 30, which receives the signal transmitted by the transmitter that penetrates the bottle. The receiver 40 is equipped with a data processing module and a control module. The received signal is processed by the data processing module and outputs an analog signal. The control module provides a judgment result based on the received analog signal, such as whether the bottle is empty, contains water, or contains alkali. This electromagnetic detection device utilizes the difference in liquid conductivity and dielectric constant to distinguish between empty bottles, water, and alkali residue (sensitivity ≤ 0.5 mL). Existing antennas can be used for the transmitting and receiving antennas, and will not be described in detail here.

[0020] like Figure 2 The diagram shows the data processing module after the receiver receives the signal.

[0021] After receiving the raw signal, the receiver sequentially processes it through a filtering circuit, a detection circuit, and an amplification circuit, outputting a 4-20mA analog signal. This analog signal is then transmitted to the control module (PLC or other hardware). The control module determines the status of the detected bottle based on the real-time value of the analog signal, such as whether it is empty, contains water, or contains alkali.

[0022] In this embodiment, the output waveform after filtering is a variable sawtooth wave. This variable sawtooth wave is detected by a detection circuit, and the root mean square (RMS) value is calculated on the waveform of the variable sawtooth wave. The voltage value is then amplified by the voltage amplification circuit and output to the analog output circuit. The analog output circuit converts the voltage signal into an analog current signal and outputs it as a 4-20mA analog signal.

[0023] like Figure 3 The diagram shows the topology of the filter circuit, detector circuit, and amplifier circuit in an embodiment of this application.

[0024] The filter circuit has an input terminal (INPUT) and an output terminal. The output terminal is electrically connected to one end of capacitor CB1. The other end of capacitor CB1 is connected to the first terminal of transistor BF0096S and one end of resistor RB1. The other end of resistor RB1 is connected to one end of resistor RB7. The other end of RB7 is connected to one end of resistor RB2. The other end of resistor RB2 is connected to the trigger terminal of transistor BF0096S, one end of RB3, and one end of capacitor CB2. The other end of capacitor CB2 is electrically grounded. The other end of resistor RB3 is electrically connected to one end of capacitor CB3 and one end of resistor RB4. The other end of resistor RB4 is electrically grounded. The other end of capacitor CB3 is electrically connected to one end of inductor L1, capacitor CB4, and resistor CB6, respectively. The other ends of inductor L1, capacitor CB4, and resistor CB6 are electrically grounded.

[0025] The detection circuit includes an input terminal and an RF detection module AD8361ARMZ (a similar chip can be used in other implementations). A DC signal is output through pin 6 of the RF detection module. Pin 6 is equipped with a capacitor C7. The input terminal is electrically connected to one end of resistor R6. The other end of resistor R6 is electrically connected to one end of resistor R5 and one end of capacitor C3. The other end of capacitor C3 is electrically connected to pin 3 of the RF detection module, and the other end of resistor R5 is electrically grounded.

[0026] This amplifier circuit (voltage amplifier circuit) includes an output terminal and an amplifier, such as an LM358 (a similar chip can be used in other implementations). The output terminal is electrically connected to pin 6 of the RF detection module and one end of resistor R12. The other end of resistor R12 is electrically connected to the third port 3 of the amplifier. The first port 1 of the amplifier outputs a signal (voltage signal). The second port 2 of the amplifier is connected to one end of resistor R13 and one end of resistor R14. The other end of resistor R13 is electrically grounded, and the other end of resistor R14 is electrically connected to the first port 1 and the ground terminal GND.

[0027] like Figure 4 The diagram shows a topology of an analog output circuit according to an embodiment of this application. This analog output circuit converts a voltage signal into an analog current signal.

[0028] This analog output circuit has an input terminal, which receives the amplified voltage signal (V_out) from the amplifier circuit, processes it, and outputs an analog signal (AOUT1) from its output terminal. This analog output circuit includes an XTR111 chip (voltage-to-current converter), transistor Q2, and MOSFET Q3. The second terminal of MOSFET Q3 is electrically connected to one end of resistor RA2 and one end of capacitor CA4. The other end of resistor RA2 is connected to the output terminal, and the other end of capacitor CA4 is electrically grounded. The first terminal of MOSFET Q3 is electrically connected to one end of resistor RA1 and the gate terminal of transistor Q2. The other end of resistor RA1 is electrically connected to the first terminal of transistor Q2 and pin 2 of the XTR111 chip. The second terminal of transistor Q2 is electrically connected to the trigger terminal of MOSFET Q3 and pin 3 of the XTR111 chip.

[0029] One end of capacitor CA2 is connected to one end of capacitor CA3 and pin 1 of the XTR111 chip, and the other end of capacitor CA2 is connected to the other end of capacitor CA3, the GND terminal, and pins 9 / 10 of the XTR111 chip.

[0030] The input terminal is electrically connected to the cathode of diode D5 and one end of resistor RA4. The other end of resistor RA4 is electrically connected to pin 6 of the XTR111 chip. The anode of diode D5 is electrically connected to one end of resistor RA3 and GND terminal. The other end of resistor RA3 is electrically connected to pin 7 of the XTR111 chip.

[0031] The detection mechanism of this electromagnetic detection device works as follows: During detection, the transmitting end of the device generates a high-frequency electromagnetic signal, which penetrates the bottle (such as the glass bottle wall) to form a spatial electromagnetic field. When there is liquid at the bottom of the bottle, the conductivity and dielectric constant of the liquid change the distribution of the electromagnetic field, resulting in amplitude attenuation, phase shift, and slight frequency changes in the received signal. With air or an empty bottle, the electromagnetic field attenuation is minimal, the received signal amplitude is maximum, and the phase lags. With water, the dielectric polarization effect is significant, resulting in a medium amplitude received signal. With alkaline solution, eddy current loss dominates, resulting in the lowest received signal amplitude and a leading phase. After receiving the raw signal, the receiving end processes it through a four-stage circuit: filtering, detection, amplification, and finally outputting a 4-20mA analog signal. This analog signal is connected to a control module (such as a PLC or other hardware device). The control module provides a judgment result based on the real-time value of the analog signal, which includes whether the bottle is empty, contains water, or is in alkaline solution.

[0032] The above embodiments are only for illustrating the technical concept and features of this application, and are intended to enable those skilled in the art to understand the content of this application and implement it accordingly. They should not be used to limit the scope of protection of this application. All equivalent changes or modifications made in accordance with the spirit and essence of this application should be included within the scope of protection of this application.

Claims

1. A non-contact electromagnetic detection device for detecting residual liquid in a bottle, characterized in that, include: Transmitter and receiver, The transmitting end is connected to a transmitting antenna, through which high-frequency electromagnetic pulses are transmitted; The receiving end is connected to a receiving antenna, which receives the signal transmitted by the transmitting end that penetrates the bottle. The receiving end is also equipped with a data processing module and a control module. The data processing module is configured to receive the signal fed back by the receiving antenna, output an analog signal to the control module, and the control module gives a judgment result based on the received analog signal.

2. The electromagnetic detection device as described in claim 1, characterized in that, The transmitting antenna transmits high-frequency electromagnetic waves with a frequency between 1MHz and 1GHz.

3. The electromagnetic detection device as described in claim 1, characterized in that, The bottle body is made of glass or plastic.

4. The electromagnetic detection device as described in claim 1, characterized in that, The data processing module is configured to receive the signal fed back by the receiving antenna, filter, detect, and amplify it, and output a 4-20mA analog signal.

5. The electromagnetic detection device as described in claim 4, characterized in that, The root mean square (RMS) value is obtained by performing RMS calculation on the filtered waveform based on the detection circuit, and the voltage value is output.

6. The electromagnetic detection device as described in claim 5, characterized in that, The voltage is amplified by an amplifier circuit, and the amplified voltage is output to an analog output circuit.

7. The electromagnetic detection device as described in claim 6, characterized in that, The analog output circuit includes the XTR111 chip.

8. The electromagnetic detection device as described in claim 6, characterized in that, The amplifier circuit includes an output terminal and an amplifier. The output terminal is electrically connected to pin (6) of the radio frequency detection module and one end of resistor (R12), and the other end of resistor (R12) is electrically connected to the third port (3) of the amplifier. The first port (1) of the amplifier outputs a signal. The second port (2) of the amplifier is connected to one end of resistor (R13) and one end of resistor (R14). The other end of resistor (R13) is electrically grounded, and the other end of resistor (R14) is electrically connected to the first port (1) and the ground terminal GND.

9. The electromagnetic detection device as described in claim 1, characterized in that, The control module is a PLC module.

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