Pulse type cigarette loose end detection light-emitting tube control circuit

Abstract

The utility model discloses a pulse type cigarette loose end detection luminous tube control circuit which comprises a multivibrator, a time control circuit and a light intensity control circuit. The first input end of the multivibrator is connected with a light-emitting tube trigger signal; the time control circuit comprises an adjustable resistor and a capacitor which are connected in series, and the second input end of the multivibrator is connected to the joint of the adjustable resistor and the capacitor; the light intensity control circuit comprises a voltage stabilizing diode, a triode and a current-limiting resistor, the negative electrode of the voltage stabilizing diode is connected to the output end of the multivibrator and the base electrode of the triode, the emitting electrode of the triode is connected with the current-limiting resistor, and the collector electrode of the triode is connected with the controlled light-emitting tube. A light-emitting tube is started in a signal triggering mode, time control over light-emitting pulses of the light-emitting tube is achieved through a variable resistor, and control over the light intensity of the light-emitting tube is achieved through a voltage stabilizing diode, a triode and a current limiting resistor.

Description

Technical Field

[0001] The utility model relates to the technical field of cigarette detection, in particular to a pulse type cigarette empty detection light emitting tube control circuit. Background Art

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

[0003] In the field of cigarette short end detection, there are mechanical, machine vision, capacitive, photoelectric and other types. The mechanical type uses contact to detect the degree of short ends in cigarettes. This method will further aggravate the degree of short ends due to the pressure generated by contact. Because the mechanical contact speed is slow, it is suitable for detection in areas where cigarette production and transportation are slow, such as small package packaging areas.

[0004] Machine vision uses image processing, which is non-contact and has no effect on empty heads. However, it has high requirements for the imaging environment and processing speed. It is not suitable for use in cigarette rolling and splicing production areas. This is because the production speed in the rolling and splicing production area is high (>150 cigarettes / second), requiring the camera to process at a speed of more than 150 frames / second, and the size of the camera or camera lens must be very small. At the same time, a large amount of dust will be generated in this area, affecting the camera imaging quality. Therefore, machine vision is more suitable for detection in areas where the speed of cigarette production and transportation is low, such as small package packaging areas.

[0005] Capacitive is a contact method for detecting short ends. It uses the change in the dielectric constant of the medium to detect short ends. The detection effect is relatively good, but when it effectively contacts the lit end of a cigarette in high-speed transport, it will cause collision and friction, which will further cause the short end to become larger.

[0006] Photoelectric detection is a non-contact detection method with the advantages of small size, high response speed, and dust resistance. The light sources for photoelectric short detection are visible light and invisible light; visible light is divided into red light, green light or RGB light. Usually, strong light is needed to illuminate the short end so that the tobacco will reflect and project the light. However, if the light is too weak, it cannot penetrate the tobacco. If the light is too strong, it will cause secondary reflection in the surrounding environment, affecting the detection accuracy. Furthermore, the current light-emitting tube is a constant-on type, which will cause ineffective illumination in some areas that do not need to be illuminated. Utility Model Content

[0007] In order to solve the above problems, the utility model proposes a pulse type cigarette empty detection light emitting tube control circuit, which starts the light emitting tube by signal triggering, controls the time of the light emitting tube light pulse by a variable resistor, and controls the light intensity of the light emitting tube by a voltage stabilizing diode, a triode and a current limiting resistor.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] In a first aspect, the utility model provides a pulse type cigarette empty detection light emitting tube control circuit, comprising: a multivibrator, a time control circuit and a light intensity control circuit;

[0010] The first input end of the multivibrator is connected to the light emitting diode trigger signal;

[0011] The time control circuit comprises an adjustable resistor and a capacitor connected in series, and the connection point between the adjustable resistor and the capacitor is connected to the second input terminal of the multivibrator;

[0012] The light intensity control circuit comprises a voltage stabilizing diode, a transistor and a current limiting resistor. The cathode of the voltage stabilizing diode is connected to the output end of the multivibrator and the base of the transistor. The emitter of the transistor is connected to the current limiting resistor. The collector of the transistor is connected to the controlled light emitting tube.

[0013] As an optional implementation, one end of the adjustable resistor and one end of the capacitor are both connected to the second input terminal of the multivibrator, the other end of the adjustable resistor is connected to the power supply 15V, and the other end of the capacitor is connected to the first power supply interface of the multivibrator and the power supply 0V.

[0014] As an optional implementation, the adjustment range of the variable resistor is [0-200k].

[0015] As an optional implementation, the time adjustable range of the time control circuit is 0 to 14000 us.

[0016] As an optional implementation, the cathode of the voltage regulator diode is connected to the output end of the multivibrator through a third resistor, one end of the third resistor is connected to the output end of the multivibrator, and the other end is connected to the cathode of the voltage regulator diode and the base of the transistor.

[0017] As an optional implementation, the anode of the Zener diode is connected to a power supply of 0V.

[0018] As an optional implementation, the emitter of the transistor is connected to one end of a current limiting resistor, and the other end of the current limiting resistor is connected to a power supply of 0V.

[0019] As an optional implementation, the collector of the transistor is connected to the negative electrode of the controlled light-emitting tube, the positive electrode of the controlled light-emitting tube is connected to one end of the first resistor, and the other end of the first resistor is connected to the power supply 15V.

[0020] As an optional implementation, the second power supply interface of the multivibrator is connected to a power supply of 15V, and the first power supply interface is connected to a power supply of 0V.

[0021] As an optional implementation, when the light-emitting tube trigger signal enters the multivibrator, a high-level pulse is output at the output end of the multivibrator. The high-level pulse is stabilized when passing through the voltage-regulating diode, driving the transistor to open, and controlling the current flowing through the current-limiting resistor to be constant.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] The utility model proposes a pulse type cigarette empty detection light emitting tube control circuit, which connects a series adjustable resistor and a capacitor to a multivibrator to form a time control circuit for the light emitting tube light pulse, and realizes the time control of the light emitting pulse through a variable resistor; a light intensity control circuit is formed by a voltage stabilizing diode, a triode and a current limiting resistor. When a trigger signal enters the multivibrator, a high level pulse is formed at the output end, and the pulse is stabilized when passing through the voltage stabilizing diode, thereby driving the triode to open. According to Ohm's theorem, the current flowing through the second resistor is constant. As a result, the controlled light emitting tube emits a flash with a fixed light intensity and a fixed time length, and the duration of the fixed light intensity can be adjusted by adjusting the resistance value of the adjustable resistor.

[0024] The utility model proposes a pulse type cigarette empty detection light emitting tube control circuit, which is used for controlling the light emitting tube of the cigarette empty detector in the rolling and splicing production area where cigarettes are produced at high speed, and solves the problem of quickly fixing the light intensity when the cigarettes pass through the detection position quickly during high-speed operation. Compared with the constantly on light emitting tube, the utility model greatly reduces the ineffective illumination, and at the same time, because the high current flowing through the light emitting tube is short in time and the heat accumulation is small, the problems of rapid attenuation of the luminous intensity caused by the heat accumulation of the light emitting tube and shortened life of the light emitting tube due to extreme heat are solved, the stability of the detection is effectively maintained and the life of the light emitting tube is extended, the maintenance frequency is reduced, and the operation and maintenance cost is reduced.

[0025] Advantages of additional aspects of the present invention will be partially given in the following description, and partially become apparent from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0027] Figure 1 This is a control circuit diagram of a pulse-type empty cigarette detection light-emitting tube provided in Example 1 of the utility model. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0029] It should be noted that the following detailed descriptions are exemplary and are intended to provide further description 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.

[0030] 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 utility model. 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 the terms "include" and "comprise" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] In the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0032] Example 1

[0033] This embodiment provides a pulse type cigarette empty detection light emitting tube control circuit, which uses a signal triggering method to start the light emitting tube, and a time control circuit and a light intensity control circuit of the light emitting tube light pulse are formed based on a multivibrator, and the light emitting time of the light emitting tube is controlled by controlling the pulse width, and the current of the light emitting tube is controlled by a voltage stabilizing diode, a triode and a current limiting resistor. It is used for controlling the infrared light emitting tube of the cigarette empty detector in the rolling and splicing production area where cigarettes are produced at a high speed, so as to emit a detection light with a fixed intensity of microsecond level.

[0034] like Figure 1 As shown, it specifically includes: a multivibrator, a time control circuit and a light intensity control circuit;

[0035] The first input end of the multivibrator is connected to the light emitting diode trigger signal;

[0036] The time control circuit comprises an adjustable resistor and a capacitor connected in series, and the connection point between the adjustable resistor and the capacitor is connected to the second input terminal of the multivibrator;

[0037] The light intensity control circuit comprises a voltage stabilizing diode, a transistor and a current limiting resistor. The cathode of the voltage stabilizing diode is connected to the output end of the multivibrator and the base of the transistor. The emitter of the transistor is connected to the current limiting resistor. The collector of the transistor is connected to the controlled light emitting tube.

[0038] In this embodiment, the first input terminal (pin A) of the multivibrator U1 is connected to the light-emitting diode trigger signal for triggering and starting the light-emitting diode D1.

[0039] In this embodiment, one end of the adjustable resistor RV4 and one end of the capacitor C1 are both connected to the second input terminal (R pin) of the multivibrator U1, the other end of the adjustable resistor RV4 is connected to the power supply 15V, the other end of the capacitor C1 is connected to the first power supply interface (C pin) of the multivibrator U1 and the power supply 0V, and the first power supply interface (C pin) of the multivibrator U1 is connected to the power supply 0V.

[0040] In this embodiment, the adjustable resistor and capacitor connected in series are connected to a multivibrator to form a time control circuit for the light emitting pulse of the infrared light emitting tube, and the time control of the light emitting pulse is achieved through the variable resistor RV4.

[0041] Specifically, the capacitor C1 is 10nF-470nF, the adjustment range of the variable resistor RV4 is [0-200k], and the time constant of the multivibrator is t=0.7*RV4*C1.

[0042] Preferably, the capacitor C1 is 100 nF, the adjustment range of the variable resistor RV4 is [0-200 k], and the time constant of the multivibrator is t=0.7*RV4*C1, that is, the adjustable range of t is 0-14000 us.

[0043] In this embodiment, the cathode of the voltage zener diode V1 is connected to the output end (Q pin) of the multivibrator U1 through the third resistor R3, that is, one end of the third resistor R3 is connected to the output end (Q pin) of the multivibrator U1, and the other end is connected to the cathode of the voltage zener diode V1;

[0044] The cathode of the voltage stabilizing diode V1 and the other end of the third resistor R3 are both connected to the base of the transistor P1;

[0045] The positive pole of the voltage zener diode V1 is connected to the power supply 0V;

[0046] The emitter of the transistor P1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to 0V;

[0047] The collector of the transistor P1 is connected to the cathode of the controlled light emitting tube D1 , the anode of the controlled light emitting tube D1 is connected to one end of the first resistor R1 , and the other end of the first resistor R1 is connected to the power supply 15V.

[0048] As an optional implementation, the second resistor is a current limiting resistor.

[0049] As an optional implementation, the voltage of the Zener diode V1 is 3.9-5.5V.

[0050] Preferably, the voltage regulator diode V1 is 5V.

[0051] As an optional implementation, the resistance of the third resistor R3 is 5-20k, and the resistance of the first resistor and the second resistor are both 1-10Ω.

[0052] Preferably, the resistance of the third resistor R3 is 10K, and the resistance of the first resistor and the second resistor are both 2Ω.

[0053] In this embodiment, the second power supply interface (B pin) and the clear interface (CLR pin) of the multivibrator U1 are connected to a power supply of 15V, and the multivibrator is powered by 15V and 0V.

[0054] In this embodiment, the current control of the light-emitting tube is realized by using a voltage-stabilizing diode, a transistor and a current-limiting resistor. When a trigger signal enters the A foot of the multivibrator, a high-level pulse of 0 to 14000us is formed at the Q foot. When the pulse passes through the voltage-stabilizing diode V1, it is stabilized to 5V, and then drives the transistor to be turned on. According to Ohm's theorem, the current flowing through the second resistor R2 is I = (5-0.7) / 2.0 = 2.15A, that is, the current passing through the controlled light-emitting tube D1 is constant at 2.15A, and the duration accuracy can be controlled to microseconds.

[0055] As an optional implementation, the constant value of the current of the controlled light-emitting diode D1 ranges from 0.4A to 4.0A.

[0056] As a result, the controlled light-emitting tube emits a flash of fixed light intensity and fixed duration. The duration of the fixed light intensity can be adjusted by adjusting the resistance value of the adjustable resistor RV4, thereby forming an effective illumination of the empty end of the cigarette with fixed light intensity and fixed duration, so that the receiving end obtains a signal that is easily distinguishable and identifiable.

[0057] The present embodiment provides a pulsed type cigarette empty detection light-emitting tube control circuit, which is used for controlling the light-emitting tube of the cigarette empty detector in the rolling and splicing production area where cigarettes are produced at a high speed, so as to emit detection light with a fixed intensity in microseconds, thereby solving the problem of fast fixed light intensity illumination when the cigarette passes through the detection position quickly (<2ms time) during high-speed operation. Compared with the constantly on light-emitting tube, ineffective illumination is greatly reduced. At the same time, because the high current flowing through the light-emitting tube is very short and the heat accumulation is small, the problems of rapid attenuation of the luminous intensity caused by heat accumulation in the light-emitting tube and shortened life of the light-emitting tube due to extreme heat are solved, the stability of detection is effectively maintained and the life of the infrared light-emitting tube is extended, the frequency of manual maintenance is reduced, and the operation and maintenance costs are greatly reduced.

[0058] Although the above describes the specific implementation methods of the utility model in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A pulse type cigarette empty end detection light emitting tube control circuit, characterized in that: include: Multivibrator, time control circuit and light intensity control circuit; The first input end of the multivibrator is connected to the light emitting diode trigger signal; The time control circuit comprises an adjustable resistor and a capacitor connected in series, and the connection point between the adjustable resistor and the capacitor is connected to the second input terminal of the multivibrator; The light intensity control circuit comprises a voltage stabilizing diode, a transistor and a current limiting resistor. The cathode of the voltage stabilizing diode is connected to the output end of the multivibrator and the base of the transistor. The emitter of the transistor is connected to the current limiting resistor. The collector of the transistor is connected to the controlled light emitting tube.

2. A pulse type cigarette empty end detection light emitting tube control circuit as claimed in claim 1, characterized in that: One end of the adjustable resistor and one end of the capacitor are both connected to the second input end of the multivibrator, the other end of the adjustable resistor is connected to the power supply 15V, and the other end of the capacitor is connected to the first power supply interface of the multivibrator and the power supply 0V.

3. A pulse type cigarette empty end detection light emitting tube control circuit as claimed in claim 1, characterized in that: The adjustment range of the variable resistor is [0~200k].

4. A pulse type cigarette empty end detection light emitting tube control circuit as claimed in claim 1, characterized in that: The adjustable time range of the time control circuit is 0 to 14000us.

5. A pulse type cigarette empty end detection light emitting tube control circuit as claimed in claim 1, characterized in that: The cathode of the voltage stabilizing diode is connected to the output end of the multivibrator through the third resistor. One end of the third resistor is connected to the output end of the multivibrator, and the other end is connected to the cathode of the voltage stabilizing diode and the base of the transistor.

6. A pulse type cigarette empty end detection light emitting tube control circuit as claimed in claim 1, characterized in that: The anode of the Zener diode is connected to the power supply 0V.

7. A pulse type cigarette empty end detection light emitting tube control circuit as claimed in claim 1, characterized in that: The emitter of the transistor is connected to one end of the current limiting resistor, and the other end of the current limiting resistor is connected to the power supply 0V.

8. A pulse type cigarette empty end detection light emitting tube control circuit as claimed in claim 1, characterized in that: The collector of the triode is connected to the negative electrode of the controlled light-emitting tube, the positive electrode of the controlled light-emitting tube is connected to one end of the first resistor, and the other end of the first resistor is connected to the power supply 15V.

9. A pulse type cigarette empty end detection light emitting tube control circuit as claimed in claim 1, characterized in that: The second power supply interface of the multivibrator is connected to a power supply of 15V, and the first power supply interface is connected to a power supply of 0V.

10. A pulse type cigarette empty end detection light emitting tube control circuit as claimed in claim 1, characterized in that: When the light-emitting tube trigger signal enters the multivibrator, a high-level pulse is output at the output end of the multivibrator. The high-level pulse is stabilized when passing through the voltage-regulating diode, driving the transistor to open, thereby controlling the current flowing through the current-limiting resistor to be constant.

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