A control circuit for a roller thread break sensor

Abstract

The utility model discloses a control circuit of broken yarn sensor of gyro wheel, specifically relates to sensor control technical field, including power supply circuit, hall signal conditioning circuit, integral control circuit and threshold detection circuit, the hall signal conditioning circuit includes hall element U1, hall element U1 is connected with pull -up resistance R2, voltage dividing resistance R3 and differential circuit, the integral control circuit includes current -limiting resistance R5, one end of current -limiting resistance R5 is connected triode Q2 base, triode Q2 is connected with capacitor C4 and resistance R6, the utility model discloses adopts discrete component (triode, diode, resistance and capacitance spare) to have realized the reliable detection function of hall pulse signal, has not adopted MCU chip, but has adopted discrete component, both reduced cost, and improved the adaptability to the complex voltage change of industrial field, and allow a certain pulse loss when rotating, improved reliability.

Description

Technical Field

[0001] This utility model relates to the field of sensor control technology, specifically a control circuit for a roller yarn breakage sensor. Background Technology

[0002] During the spinning and yarn finishing processes of textile machinery, yarn breakage can occur due to various reasons. Operators need to take timely measures to reconnect the yarn; otherwise, it will result in a large amount of scrap and wasted energy from idle equipment operation. Therefore, yarn breakage detection devices are installed on the equipment to detect yarn breakage. Based on their working principle, common yarn breakage detection devices include photoelectric yarn breakage detection and gravity yarn breakage detection. However, photoelectric yarn breakage detection is sensitive to environmental factors and yarn type, making it prone to false detections, while gravity yarn breakage detection lacks accuracy.

[0003] Photoelectric yarn breakage detection requires a photoelectric sensor to detect yarn breakage. The control circuit of the roller yarn breakage sensor is the core of the sensor's function, needing to enable the light to turn off when the roller rotates and turn on when the roller stops. Furthermore, it must be adaptable to different speeds. For example, the control circuit of the yarn breakage detection device disclosed in Chinese Patent Publication No. CN 203320209 U mentions that "it can accurately transmit information such as the yarn breakage location number, yarn breakage time, and reconnection time to the main control board of the twisting machine head. The main control board controls and displays the accurate yarn breakage location, allowing wiring personnel to directly locate the yarn breakage location for reconnection without repeated patrols." Its specific structure is as follows: Figure 1 As shown, roller yarn breakage sensors on the market often use MCU control, which is costly, and fluctuations in the field voltage can easily cause the MCU to restart. Utility Model Content

[0004] The purpose of this invention is to provide a control circuit for a roller yarn breakage sensor to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A control circuit for a roller yarn breakage sensor includes a power supply circuit, a Hall signal conditioning circuit, an integral control circuit, and a threshold detection circuit. The Hall signal conditioning circuit includes a Hall element U1, which is connected to a pull-up resistor R2, a voltage divider resistor R3, and a differentiating circuit. The integral control circuit includes a current-limiting resistor R5, one end of which is connected to the base of a transistor Q2. The transistor Q2 is connected to a capacitor C4 and a resistor R6.

[0007] In a preferred embodiment, the power supply circuit includes a capacitor C1, a diode D1 and a voltage regulator circuit connected to the capacitor C1. The voltage regulator circuit includes a transistor Q1 connected to the capacitor C1, a diode D2 connected in series with the transistor Q1, and a capacitor C2 connected in parallel with the transistor Q1 and diode D2. The voltage regulator circuit composed of the transistor Q1 and the 9.1V Zener diode D2 is simple and effective in design, meets the requirements of this product, and is low in cost.

[0008] In a preferred embodiment, the differentiating circuit includes a capacitor C3 and a resistor R4 connected to the Hall element U1. The resistor R4 is connected to a current-limiting resistor R5. The signal generated by the Hall element controls the base of the transistor Q2 through the current-limiting resistor R5. The capacitor C4 and the resistor R6 form an integrating circuit. When the roller rotates, the transistor Q2 is turned on and the capacitor C4 is discharged. When the roller stops rotating, the transistor Q2 is turned off and VCC charges the capacitor C4 through the resistor R6.

[0009] In a preferred embodiment, the threshold detection circuit includes a transistor Q3 connected to a capacitor C4, the transistor Q3 is connected to resistors R7, R8 and R9, the resistor R9 is connected in series with the transistor Q4, and the transistor Q4 is connected to an LED diode D3 and an LED current-limiting resistor R10.

[0010] In a preferred embodiment, the transistor Q4 is connected to the connector P1 via the diode D4, and the connector P1 is connected to the power supply circuit.

[0011] In a preferred embodiment, a switch S1 is provided between the plug P1 and the power circuit.

[0012] In a preferred embodiment, the transistor Q4 is a switching transistor, the resistor R9 is a base current limiting resistor, and the resistor R10 is an LED current limiting resistor.

[0013] In a preferred embodiment, when the roller rotates in the integral control circuit, transistor Q2 is turned on, and capacitor C4 discharges; when the roller stops rotating, transistor Q2 is turned off, and VCC charges capacitor C4 through resistor R6.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention uses discrete components (transistors, diodes, resistors and capacitors) to achieve reliable detection of Hall pulse signals. Instead of using an MCU chip, discrete components are used, which reduces costs, improves adaptability to complex voltage changes in industrial environments, and allows for some pulse loss during rotation, thus improving reliability. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of a traditional control circuit.

[0018] Figure 2 This is a schematic diagram of the circuit structure of this utility model;

[0019] Figure 3 This is a core architecture block diagram of this utility model. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 2 and Figure 3 This utility model provides a control circuit for a roller yarn breakage sensor, and the technical solution is as follows:

[0022] A control circuit for a roller yarn breakage sensor includes a power supply circuit. The power supply circuit includes a capacitor C1, a diode D1, and a voltage regulator circuit connected to the capacitor C1. The voltage regulator circuit includes a transistor Q1 connected to the capacitor C1, a diode D2 connected in series with the transistor Q1, and a capacitor C2 connected in parallel with the transistor Q1 and diode D2. Diode D1 provides 24V reverse connection protection. The voltage regulator circuit composed of transistor Q1 and 9.1V voltage regulator diode D2 is simple and effective in design, meets the requirements of this product, and is low in cost. The measured VCC≈8.4V. A switch S1 is provided so that the sensor can be turned off by disconnecting the power supply.

[0023] The Hall signal conditioning circuit includes a Hall element U1, which is connected to a pull-up resistor R2, a voltage divider resistor R3, and a differentiating circuit. The differentiating circuit includes a capacitor C3 and a resistor R4 connected to the Hall element U1. The resistor R4 is connected to a current-limiting resistor R5. The Hall element U1 outputs a magnetic induction signal. The pulse signal outputs a low level when the magnetic pole is close and a high level when the magnetic pole is far away. The pull-up resistor R2 and the voltage divider resistor R3 ensure that the high level is stable at about 3.8V. The differentiating circuit composed of capacitor C3 and resistor R4 converts the pulse signal output by the Hall element U1 into a differential signal.

[0024] An integral control circuit includes a current-limiting resistor R5, one end of which is connected to the base of transistor Q2. Transistor Q2 is connected to capacitor C4 and resistor R6. The signal generated by Hall element U1 controls the base of transistor Q2 through the current-limiting resistor R5. Capacitor C4 and resistor R6 form an integral circuit. When the roller rotates, transistor Q2 is turned on, and capacitor C4 discharges. When the roller stops rotating, transistor Q2 is turned off, and VCC charges capacitor C4 through resistor R6.

[0025] A threshold detection circuit includes a transistor Q3 connected to capacitor C4. Transistor Q3 is connected to resistors R7, R8, and R9. Resistor R9 is connected in series with transistor Q4. LED diode D3 and LED current-limiting resistor R10 are connected to transistor Q4. Transistor Q4 is connected to connector P1 via diode D4. Connector P1 is connected to a power supply circuit. The base of transistor Q3 directly monitors the voltage across capacitor C4. When the roller stops, capacitor C4 is charged, causing the base voltage of transistor Q3 to reach above 0.7V, turning on transistor Q3. Due to the voltage division between resistors R7 and R8, the base voltage of transistor Q4 is greater than 0.7V, turning on transistor Q4 and lighting the LED. When the roller rotates, capacitor C4 discharges, causing the base voltage of transistor Q3 to fall below 0.7V, turning off transistor Q3. The base voltage of transistor Q4 also falls below 0.7V, turning off transistor Q4 and turning off the LED. Transistor Q4 is a switching transistor, resistor R9 is a base current-limiting resistor, and resistor R10 is an LED current-limiting resistor.

[0026] Its control logic is shown in Table 1:

[0027] Scroll status Q2 Q3 Q4 led Rotation Conductivity Deadline Deadline Bright Stop Deadline Conductivity Conductivity Extinction

[0028] Table 1

[0029] The working principle of this utility model:

[0030] This invention uses discrete components (transistors, diodes, resistors and capacitors) to achieve reliable detection of Hall pulse signals. Instead of using an MCU chip, discrete components are used, which reduces costs, improves adaptability to complex voltage changes in industrial environments, and allows for some pulse loss during rotation, thus improving reliability.

[0031] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A control circuit for a roller yarn breakage sensor, characterized in that: It includes a power supply circuit, a Hall signal conditioning circuit, an integral control circuit, and a threshold detection circuit. The Hall signal conditioning circuit includes a Hall element U1, which is connected to a pull-up resistor R2, a voltage divider resistor R3, and a differentiating circuit. The integral control circuit includes a current-limiting resistor R5, one end of which is connected to the base of a transistor Q2. The transistor Q2 is connected to a capacitor C4 and a resistor R6.

2. The control circuit for a roller yarn breakage sensor according to claim 1, characterized in that: The power supply circuit includes a capacitor C1, a diode D1 and a voltage regulator circuit connected to the capacitor C1. The voltage regulator circuit includes a transistor Q1 connected to the capacitor C1, a diode D2 connected in series with the transistor Q1, and a capacitor C2 connected in parallel with the transistor Q1 and the diode D2 connected in series.

3. The control circuit for a roller yarn breakage sensor according to claim 2, characterized in that: The differentiating circuit includes a capacitor C3 and a resistor R4 connected to the Hall element U1, and the resistor R4 is connected to the current-limiting resistor R5.

4. The control circuit for a roller yarn breakage sensor according to claim 1, characterized in that: The threshold detection circuit includes a transistor Q3 connected to a capacitor C4. The transistor Q3 is connected to resistors R7, R8 and R9. The transistor Q4 is connected in series with resistor R9. The transistor Q4 is connected to an LED diode D3 and an LED current-limiting resistor R10.

5. The control circuit for a roller yarn breakage sensor according to claim 4, characterized in that: The transistor Q4 is connected to the connector P1 via the diode D4, and the connector P1 is connected to the power supply circuit.

6. The control circuit for a roller yarn breakage sensor according to claim 5, characterized in that: A switch S1 is provided between the plug P1 and the power circuit.

7. The control circuit for a roller yarn breakage sensor according to claim 4, characterized in that: The transistor Q4 is a switching transistor, the resistor R9 is a base current limiting resistor, and the resistor R10 is an LED current limiting resistor.

8. The control circuit for a roller yarn breakage sensor according to claim 1, characterized in that: In the integral control circuit, when the roller rotates, transistor Q2 is turned on and capacitor C4 is discharged; when the roller stops rotating, transistor Q2 is turned off and VCC charges capacitor C4 through resistor R6.

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