Online environment-friendly paper detection sensor for cigarette industry

Abstract

The invention relates to the technical field of cigarette processing quality control, and provides an online environment-friendly paper detection sensor for cigarette industry, comprising: a detection probe for detecting environment-friendly paper, the detection probe comprising a first primary coil, a second primary coil and a secondary coil, the secondary coil is arranged between the first primary coil and the second primary coil, and the winding directions of the first primary coil and the second primary coil are opposite; the first primary coil and the second primary coil are both connected with a high-frequency excitation source, the secondary coil is connected with a high-frequency amplification circuit, the high-frequency amplification circuit is connected with a detector, and the detector is connected with a signal conditioner; and the high-frequency excitation source, the high-frequency amplification circuit, the detector and the signal conditioning circuit are all connected with the power supply circuit. According to the invention, the defects of the conventional sensor are overcome, the environment-friendly paper with extremely low metal content can be reliably detected on line, and the quality of cigarette products is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of cigarette processing quality control, and in particular to an online environmentally friendly paper detection sensor for the cigarette industry. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Since aluminum cardboard previously contained a high metal content, cigarette factories usually used inductive sensors to detect the presence of cardboard during production. The principle is that the inductive sensor emits a high-variable electromagnetic signal to generate eddy currents in the metal of the detected cardboard, which can be reflected back to the inductive sensor probe. The probe determines the presence of cardboard by sensing the size of the eddy current reflection.

[0004] Now that environmentally friendly paper has been used, the metal content in environmentally friendly paper is extremely low, about 1 / 100 of the metal content in the previous aluminum cardboard, which makes the previous inductive sensor detection fail and cannot work. Summary of the invention

[0005] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides an online environmentally friendly paper detection sensor for the cigarette industry, which overcomes the shortcomings of previous sensors and can reliably detect environmentally friendly paper with very little metal content online to ensure the quality of cigarette products.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A first aspect of the present invention provides an online environmentally friendly paper detection sensor for the cigarette industry.

[0008] An online environmentally friendly paper detection sensor for the cigarette industry, comprising: a detection probe for detecting environmentally friendly paper, the detection probe comprising a first primary coil, a second primary coil and a secondary coil, the secondary coil being arranged between the first primary coil and the second primary coil, and the first primary coil and the second primary coil being wound in opposite directions;

[0009] The first primary coil and the second primary coil are both connected to a high-frequency excitation source, the secondary coil is connected to a high-frequency amplifier circuit, the high-frequency amplifier circuit is connected to a detector, and the detector is connected to a signal conditioner;

[0010] The high-frequency excitation source, high-frequency amplifying circuit, detector and signal conditioning circuit are all connected to the power supply circuit.

[0011] Furthermore, if the signal conditioner outputs a high-frequency voltage signal, the detection probe detects the environmentally friendly paper; otherwise, the environmentally friendly paper is not detected.

[0012] Furthermore, the detection probe also includes a pot-type magnetic core, which includes a peripheral wall, a bottom plate and a central column. The peripheral wall and the bottom plate form a cylindrical structure with an open upper end. A central column is provided in the center of the bottom plate, and the first primary coil, the second primary coil and the secondary coil are all surrounded by the central column.

[0013] Furthermore, the high-frequency excitation source includes a high-frequency signal source, the output OUT of the high-frequency signal source is connected to a certain arm end of the first adjustable resistor and the second adjustable resistor, the movable arm end of the first adjustable resistor is connected to the first amplifier, the movable arm end of the second adjustable resistor is connected to the second amplifier, the other fixed arm end of the first adjustable resistor and the second adjustable resistor is grounded, and the first amplifier and the second amplifier output to the first primary coil and the second primary coil of the detection probe respectively.

[0014] Furthermore, the high-frequency amplification circuit includes a first resistor, a second resistor, a third resistor and a third amplifier, one end of the first resistor and one end of the second resistor are both connected to the secondary coil of the detection probe, the other end of the first resistor is respectively connected to the negative input end of the third amplifier and one end of the third resistor, the other end of the second resistor is connected to the positive input end of the third amplifier, and the other end of the third resistor is connected to the output end of the third amplifier.

[0015] Furthermore, the detector includes a first diode, a second diode and a first capacitor, one end of the first capacitor is connected to the output end of the third amplifier, the other end of the first capacitor is connected to the negative end of the first diode, the positive end of the first diode is grounded, and the positive end of the second diode is connected to the negative end of the first diode.

[0016] Furthermore, the signal conditioning circuit includes a fourth amplifier, the positive input terminal of the fourth amplifier is respectively connected to one end of the fourth resistor and the negative end of the second diode, and the other end of the fourth resistor is grounded; the negative input terminal of the fourth amplifier is respectively connected to one end of the fifth resistor, one end of the sixth resistor, and a fixed arm end and a movable arm end of the third adjustable resistor, the other end of the fifth resistor is connected to VCC, the other end of the sixth resistor is grounded, and the other fixed arm end of the third adjustable resistor is connected to the output terminal of the fourth amplifier.

[0017] Furthermore, the signal conditioning circuit also includes a fifth amplifier, a positive input terminal of the fifth amplifier is connected to one end of the eighth resistor, the other end of the eighth resistor is connected to the output terminal of the fourth amplifier, a negative input terminal of the fifth amplifier is connected to the movable arm end of the fourth adjustable resistor, a fixed arm end of the fourth adjustable resistor is connected to one end of the resistor, the other end of the resistor is connected to VCC, and the other fixed arm end of the fourth adjustable resistor is grounded.

[0018] Furthermore, the power supply circuit includes a seventh resistor, a light-emitting tube, an electrolytic capacitor and a third diode, the positive end of the third diode is an external input power supply, the negative end of the third diode is respectively connected to the positive end of the electrolytic capacitor, one end of the seventh resistor and VCC, the other end of the seventh resistor is connected to the positive end of the light-emitting tube, the negative end of the light-emitting tube is grounded, the negative end of the electrolytic capacitor is grounded, and the negative end of the light-emitting tube VCC is respectively connected to the high-frequency signal source P1, the first amplifier, the second amplifier, the third amplifier, the fourth amplifier, the fifth amplifier, the fifth resistor and the ninth resistor.

[0019] A second aspect of the present invention provides a working method of an online environmentally friendly paper detection sensor for the cigarette industry.

[0020] A working method of an online environmentally friendly paper detection sensor for the cigarette industry, using the online environmentally friendly paper detection sensor for the cigarette industry described in the first aspect, comprising:

[0021] The high-frequency signal source inputs two high-frequency excitation signals into the first amplifier and the second amplifier after voltage division by the first adjustable resistor and the second adjustable resistor;

[0022] The signal output by the first amplifier is used to excite the first primary coil, and the signal output by the second amplifier is used to excite the second primary coil, and the magnitudes of the two high-frequency excitation signals are changed by adjusting the first adjustable resistor and the second adjustable resistor;

[0023] If the environmentally friendly paper is placed on the detection probe, the high-frequency voltage signal output by the secondary coil is successively amplified by the high-frequency amplifier circuit, doubled by the detector to output a DC voltage signal, and amplified by the signal conditioning circuit, and then the voltage comparator outputs high and low level signals.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention provides an online environmentally friendly paper detection sensor for the cigarette industry, which overcomes the shortcomings of previous sensors, can reliably detect environmentally friendly paper with very little metal content online, and can effectively ensure the packaging quality of cigarette products.

[0026] The on-line environmentally friendly paper detection sensor for the cigarette industry of the present invention is superior to the existing inductive sensors, can be produced at an industrial level and installed and used in an industrial environment, is easy to install, and operates stably and reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] Figure 1It is a structural schematic diagram of the detection probe shown in the present invention;

[0029] Figure 2 It is a principle block diagram of an online environmentally friendly paper detection sensor for the cigarette industry shown in the present invention;

[0030] Figure 3 It is a circuit diagram of an online environmentally friendly paper detection sensor for the cigarette industry shown in the present invention;

[0031] Among them, 1. a first primary coil, 2. a second primary coil, 3. a secondary coil, 4. a pot-shaped magnetic core. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0035] In order to reduce the cost of raw materials and meet environmental protection requirements in cigarette production in the tobacco industry, aluminum cardboard in the original packaging materials is gradually replaced with environmentally friendly paper. However, environmentally friendly paper cannot be detected by traditional metal sensors, which poses a technical problem of quality risks. The present invention proposes an online environmentally friendly paper detection sensor for the cigarette industry. The present invention is described in detail below through specific embodiments.

[0036] Embodiment 1

[0037] like Figure 1 As shown, this embodiment provides an online environmentally friendly paper detection sensor for the cigarette industry, including: a detection probe, a high-frequency excitation source, a power supply circuit, a high-frequency amplification circuit, a detector and a signal conditioning circuit, the high-frequency excitation source is connected to the detection probe, the detection probe is connected to the high-frequency amplification circuit, the high-frequency amplification circuit is connected to the detector, the detector is connected to the signal conditioning circuit, and the signal conditioning circuit outputs high and low level outputs; the power supply circuit supplies power to the high-frequency excitation source, the high-frequency amplification circuit, the detector and the signal conditioning circuit.

[0038] The high-frequency excitation source provides high-frequency excitation signals to the first primary coil L1 and the second primary coil L2 of the detection probe respectively; the secondary coil L3 of the detection probe outputs a signal to the high-frequency amplifier circuit, and the high-frequency amplifier circuit performs high-frequency amplification on the output signal; the high-frequency amplifier circuit outputs the high-frequency signal to the detector for voltage doubling detection to output a DC voltage signal, and the DC voltage signal output by the detector is DC-amplified by the signal conditioner, and then the voltage comparator outputs high and low level signals.

[0039] In some embodiments, Figure 2 As shown, the detection probe includes a pot-shaped magnetic core 4 and a balanced magnetic pot coil T. The pot-shaped magnetic core includes a peripheral wall, a bottom plate and a central column. The peripheral wall and the bottom plate form a structure with an upper end opening. A central column is provided at the center of the bottom plate, and the balanced magnetic pot coil T is wound around the central column. The balanced magnetic pot coil T includes a first primary coil (L1) 1, a second primary coil (L2) 2 and a secondary coil (L3) 3. The secondary coil 3 is wound between the first primary coil 1 and the second primary coil 2. The first primary coil 1 and the second primary coil 2 are wound in opposite directions. The first primary coil 1, the second primary coil 2 and the secondary coil 3 are all wound on the central column.

[0040] In some embodiments, Figure 3 As shown, the high-frequency excitation source includes a high-frequency signal source P1, a first adjustable resistor W1, a second adjustable resistor W2, a first amplifier IC1 and a second amplifier IC2, wherein the output OUT of the high-frequency signal source P1 is connected to a certain arm end of the first adjustable resistor W1 and the second adjustable resistor W2, the movable arm end of the first adjustable resistor W1 is connected to the first amplifier IC1, the movable arm end of the second adjustable resistor W2 is connected to the second amplifier IC2, the other fixed arm ends of the first adjustable resistor W1 and the second adjustable resistor W2 are grounded, and the first amplifier IC1 and the second amplifier IC2 are output to the first primary coil L1 and the second primary coil L2 of the detection probe respectively. The first amplifier IC1 and the second amplifier IC2 are both connected to VCC and grounded.

[0041] In some embodiments, the high-frequency amplification circuit includes a first resistor R1, a second resistor R2, a third resistor R3 and a third amplifier IC3, wherein one end of the first resistor R1 and one end of the second resistor R2 are both connected to the secondary coil 3 of the detection probe, the other end of the first resistor R1 is respectively connected to the negative input end of the third amplifier IC3 and one end of the third resistor R3, the other end of the second resistor R2 is connected to the positive input end of the third amplifier IC3, the other end of the third resistor R3 is connected to the output end of the third amplifier IC3, and the third amplifier IC3 is connected to VCC and grounded.

[0042] In some embodiments, the detector includes a first diode D1, a second diode D2 and a first capacitor C1, one end of the first capacitor C1 is connected to the output end of the third amplifier IC3, the other end of the first capacitor C1 is connected to the negative end of the first diode D1, the positive end of the first diode D1 is grounded, and the positive end of the second diode D2 is connected to the negative end of the first diode D1.

[0043] In some embodiments, the signal conditioning circuit includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, an eighth resistor R8, a ninth resistor R9, a third adjustable resistor W3, a fourth adjustable resistor W4, a fourth amplifier IC4 and a fifth amplifier IC5, wherein the positive input terminal of the fourth amplifier IC4 is respectively connected to one end of the fourth resistor R4 and the negative end of the second diode D2, and the other end of the fourth resistor R4 is grounded. The negative input terminal of the fourth amplifier IC4 is respectively connected to one end of the fifth resistor R5, one end of the sixth resistor R6 and a fixed arm end and a movable arm end of the third adjustable resistor W3, the other end of the fifth resistor R5 is connected to VCC, the other end of the sixth resistor R6 is grounded, and the other fixed arm end of the third adjustable resistor W3 is connected to the output terminal of the fourth amplifier IC4. The positive input terminal of the fifth amplifier IC5 is connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is connected to the output terminal of the fourth amplifier IC4. The negative input terminal of the fifth amplifier IC5 is connected to the movable arm end of the fourth adjustable resistor W4, the fixed arm end of the fourth adjustable resistor W4 is connected to one end of the resistor R9, the other end of the resistor R9 is connected to VCC, and the other fixed arm end of the fourth adjustable resistor W4 is grounded. The fourth amplifier IC4 and the fifth amplifier IC5 are both connected to VCC and grounded.

[0044] In some embodiments, the power supply circuit includes a seventh resistor R7, a light-emitting tube D, an electrolytic capacitor C2 and a third diode D3, the positive end of the third diode D3 is an external input 12V power supply, the negative end of the third diode D3 is respectively connected to the positive end of the electrolytic capacitor C2, one end of the seventh resistor R7 and VCC, the other end of the seventh resistor R7 is connected to the positive end of the light-emitting tube D, the negative end of the light-emitting tube D is grounded, the negative end of the electrolytic capacitor C2 is grounded, and the negative end VCC of the light-emitting tube D is respectively connected to the high-frequency signal source P1, the first amplifier IC1, the second amplifier IC2, the third amplifier IC3, the fourth amplifier IC4, the fifth amplifier IC5, the fifth resistor R5 and the ninth resistor R9.

[0045] The working principle of the present invention is described in detail below:

[0046] like Figure 3As shown, a high-frequency excitation signal is added to the first primary coil L1 and the second primary coil L2 of the detection probe. Since the first primary coil L1 and the second primary coil L2 are wound in opposite directions, when the electrical parameters are balanced, the high-frequency electromagnetic field signals generated by the first primary coil L1 and the second primary coil L2 on the pot-shaped magnetic core are equal in magnitude and opposite in direction. Finally, the high-frequency voltage signal induced by the secondary coil L3 is equal to zero. When environmentally friendly paper appears outside the detection probe, since the environmentally friendly paper contains a certain amount of metal, eddy currents are generated inside the metal, thereby destroying the previous state of zero electromagnetic field of the detection probe, causing the secondary coil L3 of the detection probe to induce a weak high-frequency voltage signal.

[0047] The high-frequency signal source can output a 300KHz high-frequency voltage signal with a stable frequency and amplitude. The signal is sent to the first adjustable resistor W1 and the second adjustable resistor W2 for voltage division. The two signals are respectively sent to the input ends of the first amplifier IC1 and the second amplifier IC2. Finally, the first amplifier IC1 outputs a signal to excite the first primary coil L1, and the second amplifier IC2 outputs a signal to excite the second primary coil L2. In practice, the first adjustable resistor W1 and the second adjustable resistor W2 are adjusted to change the size of the two high-frequency excitation signals, so that the detection probe keeps the output of the secondary coil L3 at a zero state when there is no metal object around it.

[0048] When the detection probe detects environmentally friendly paper, the secondary coil L3 induces a weak high-frequency voltage signal, which is sent to the third amplifier IC3 for high-frequency amplification. The amplified output signal is then passed through the detection circuit composed of the first capacitor C1, the first diode D1 and the second diode D2 for voltage doubling detection, and a DC voltage signal is output. This signal is then sent to the fourth amplifier IC4 for amplification, and then input to the voltage comparator composed of the fifth amplifier IC5 for comparison, and finally a high and low level signal is output. When there is no environmentally friendly paper in front of the detection probe, the signal conditioning circuit outputs a low level, and vice versa.

[0049] Embodiment 2

[0050] This embodiment provides a working method of an online environmentally friendly paper detection sensor for the cigarette industry, using the online environmentally friendly paper detection sensor for the cigarette industry described in Embodiment 1, including:

[0051] The high-frequency signal source inputs two high-frequency excitation signals into the first amplifier and the second amplifier after voltage division by the first adjustable resistor and the second adjustable resistor;

[0052] The signal output by the first amplifier is used to excite the first primary coil, and the signal output by the second amplifier is used to excite the second primary coil, and the magnitudes of the two high-frequency excitation signals are changed by adjusting the first adjustable resistor and the second adjustable resistor;

[0053] If the environmentally friendly paper is placed on the detection probe, the high-frequency voltage signal output by the secondary coil is successively amplified by the high-frequency amplifier circuit, doubled by the detector to output a DC voltage signal, and amplified by the signal conditioning circuit, and then the voltage comparator outputs high and low level signals.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An online environmentally friendly paper detection sensor for the cigarette industry, characterized in that: include: A detection probe for detecting environmentally friendly paper, the detection probe comprising a first primary coil, a second primary coil and a secondary coil, the secondary coil being arranged between the first primary coil and the second primary coil, and the first primary coil and the second primary coil being wound in opposite directions; The first primary coil and the second primary coil are both connected to a high-frequency excitation source, the secondary coil is connected to a high-frequency amplifier circuit, the high-frequency amplifier circuit is connected to a detector, and the detector is connected to a signal conditioner; The high-frequency excitation source, high-frequency amplifying circuit, detector and signal conditioning circuit are all connected to the power supply circuit.

2. The on-line environmentally friendly paper detection sensor for the cigarette industry according to claim 1, characterized in that: If the signal conditioner outputs a high-frequency voltage signal, the detection probe detects the environmentally friendly paper; otherwise, the environmentally friendly paper is not detected.

3. The on-line environmentally friendly paper detection sensor for the cigarette industry according to claim 2, characterized in that: The detection probe also includes a pot-shaped magnetic core, which includes a peripheral wall, a bottom plate and a central column. The peripheral wall and the bottom plate form a cylindrical structure with an open upper end. A central column is provided in the center of the bottom plate. The first primary coil, the second primary coil and the secondary coil are all surrounded by the central column.

4. The on-line environmentally friendly paper detection sensor for the cigarette industry according to claim 2, characterized in that: The high-frequency excitation source includes a high-frequency signal source, the output OUT of the high-frequency signal source is connected to a fixed arm end of a first adjustable resistor and a second adjustable resistor, the movable arm end of the first adjustable resistor is connected to a first amplifier, the movable arm end of the second adjustable resistor is connected to a second amplifier, the other fixed arm ends of the first adjustable resistor and the second adjustable resistor are grounded, and the first amplifier and the second amplifier output to the first primary coil and the second primary coil of the detection probe respectively.

5. The on-line environmentally friendly paper detection sensor for the cigarette industry according to claim 2, characterized in that: The high-frequency amplification circuit includes a first resistor, a second resistor, a third resistor and a third amplifier, one end of the first resistor and one end of the second resistor are both connected to the secondary coil of the detection probe, the other end of the first resistor is respectively connected to the negative input end of the third amplifier and one end of the third resistor, the other end of the second resistor is connected to the positive input end of the third amplifier, and the other end of the third resistor is connected to the output end of the third amplifier.

6. The on-line environmentally friendly paper detection sensor for the cigarette industry according to claim 5, characterized in that: The detector includes a first diode, a second diode and a first capacitor, one end of the first capacitor is connected to the output end of the third amplifier, the other end of the first capacitor is connected to the negative end of the first diode, the positive end of the first diode is grounded, and the positive end of the second diode is connected to the negative end of the first diode.

7. The on-line environmentally friendly paper detection sensor for the cigarette industry according to claim 6, characterized in that: The signal conditioning circuit includes a fourth amplifier, wherein the positive input terminal of the fourth amplifier is respectively connected to one end of the fourth resistor and the negative end of the second diode, and the other end of the fourth resistor is grounded; the negative input terminal of the fourth amplifier is respectively connected to one end of the fifth resistor, one end of the sixth resistor, and a fixed arm end and a movable arm end of the third adjustable resistor, the other end of the fifth resistor is connected to VCC, the other end of the sixth resistor is grounded, and the other fixed arm end of the third adjustable resistor is connected to the output terminal of the fourth amplifier.

8. The on-line environmentally friendly paper detection sensor for the cigarette industry according to claim 7, characterized in that: The signal conditioning circuit also includes a fifth amplifier, a positive input end of the fifth amplifier is connected to one end of the eighth resistor, the other end of the eighth resistor is connected to the output end of the fourth amplifier, a negative input end of the fifth amplifier is connected to the movable arm end of the fourth adjustable resistor, a fixed arm end of the fourth adjustable resistor is connected to one end of the resistor, the other end of the resistor is connected to VCC, and the other fixed arm end of the fourth adjustable resistor is grounded.

9. The on-line environmentally friendly paper detection sensor for the cigarette industry according to claim 8, characterized in that: The power supply circuit includes a seventh resistor, a light-emitting tube, an electrolytic capacitor and a third diode, the positive end of the third diode is an external input power supply, the negative end of the third diode is respectively connected to the positive end of the electrolytic capacitor, one end of the seventh resistor and VCC, the other end of the seventh resistor is connected to the positive end of the light-emitting tube, the negative end of the light-emitting tube is grounded, the negative end of the electrolytic capacitor is grounded, and the negative end of the light-emitting tube VCC is respectively connected to the high-frequency signal source P1, the first amplifier, the second amplifier, the third amplifier, the fourth amplifier, the fifth amplifier, the fifth resistor and the ninth resistor.

10. A working method of an online environmentally friendly paper detection sensor for the cigarette industry, characterized in that: The on-line environmentally friendly paper detection sensor for the cigarette industry according to any one of claims 1 to 9 comprises: The high-frequency signal source inputs two high-frequency excitation signals into the first amplifier and the second amplifier after voltage division by the first adjustable resistor and the second adjustable resistor; The signal output by the first amplifier is used to excite the first primary coil, and the signal output by the second amplifier is used to excite the second primary coil, and the magnitudes of the two high-frequency excitation signals are changed by adjusting the first adjustable resistor and the second adjustable resistor; If the environmentally friendly paper is placed on the detection probe, the high-frequency voltage signal output by the secondary coil is successively amplified by the high-frequency amplifier circuit, doubled by the detector to output a DC voltage signal, and amplified by the signal conditioning circuit, and then the voltage comparator outputs high and low level signals.

Images