Weft adaptive detection device for weft accumulator

Abstract

The utility model provides a weft self-adaptive detection device for a weft accumulator. The weft self-adaptive detection device comprises a photoelectric transmitting and receiving module, a primary filtering module, a secondary filtering module, a weft threshold signal judging and adjusting module and an electronic control module, the photoelectric emitting and receiving module detects weft yarns and sends weft yarn detection signals to the primary filtering module and the electronic control module; the first-stage filtering module comprises a first multi-stage filtering circuit, and the first multi-stage filtering circuit is provided with a bandwidth adjusting unit; the electronic control module is connected with the bandwidth adjusting unit to adjust the filtering bandwidth of the first-stage filtering module; the secondary filtering module comprises a second multi-order filtering circuit, and the second multi-order filtering circuit is provided with a gain adjusting unit; the electronic control module is connected with the gain adjusting unit to adjust the gain of the secondary filtering module; the weft yarn threshold signal judging and adjusting module comprises a hysteresis comparison circuit, and the hysteresis comparison circuit is provided with a threshold adjusting unit; the electronic control module is connected with the threshold adjusting unit to adjust hysteresis threshold voltage.

Description

Technical Field

[0001] This utility model belongs to the field of weft feeder technology, and in particular relates to a weft yarn adaptive detection device for weft feeders. Background Technology

[0002] Currently, weft detection in weft feeders typically uses photoelectric sensors. The weft feedback signal collected by the photoelectric sensor is processed through fixed modulation and filtering circuits. This method can lead to inaccurate weft signal detection when using different materials or weft yarns of varying thicknesses on the loom. This can cause malfunctions in the weft feeder, resulting in unstable loom operation, low efficiency, and even fabric defects. To improve the accuracy of weft signal detection, the feedback signal collected by the photoelectric sensor is manually adjusted using a digitally adjustable resistor via I2C or SPI, in conjunction with fixed modulation and filtering circuits. This method allows for manual gain adjustment of the weft feedback signal through software without hardware modification. However, the actual adjustment result is not quantifiable. Digitally adjustable resistors are non-linear gain adjusters, which can easily lead to non-ideal output gains. The bandwidth of the digitally adjustable resistor is limited, and combined with fixed modulation and filtering circuits, it is difficult to obtain the most ideal signal feedback and adjustment. Secondly, with the increasing use of high-frequency applications in motor control, high-frequency interference signals will be amplified synchronously as the gain increases, resulting in signal distortion and detection and judgment errors. This method is prone to causing complicated operations for debugging personnel and cannot bring the most ideal quantifiable perception results. It is also prone to causing inaccurate weft signal detection, leading to unstable operation of the loom and low efficiency.

[0003] Therefore, it is necessary to provide a weft yarn adaptive detection device for a weft feeder. Utility Model Content

[0004] This invention provides a weft yarn adaptive detection device for weft yarn feeders, which improves the accuracy of weft yarn detection and simplifies the installation and adjustment process.

[0005] To achieve the above objectives, the present invention provides the following technical solution.

[0006] An adaptive weft yarn detection device for a weft feeder includes a photoelectric transmitting and receiving module, a first-stage filtering module, a second-stage filtering module, a weft yarn threshold signal judgment and adjustment module, and an electronic control module;

[0007] The photoelectric transmitting and receiving module detects the weft yarn and sends a weft yarn detection signal to the first-level filtering module and the electronic control module.

[0008] The first-stage filtering module includes a first multi-stage filtering circuit, which is equipped with a bandwidth adjustment unit. The first-stage filtering module conditions the weft detection signal into a first-stage filtered signal and sends it to the second-stage filtering module and the electronic control module. The electronic control module is connected to the bandwidth adjustment unit and adjusts the bandwidth adjustment unit based on the comparison between the acquired first-stage filtered signal and the internal set parameters, thereby adjusting the filtering bandwidth of the first-stage filtering module.

[0009] The secondary filtering module includes a second multi-stage filtering circuit, which is equipped with a gain adjustment unit. The secondary filtering module conditions the primary filtering signal into a secondary filtering signal and sends it to the weft threshold signal judgment and adjustment module and the electronic control module. The electronic control module is connected to the gain adjustment unit and adjusts the gain of the secondary filtering module by comparing the acquired secondary filtering signal with the initial setting value of the weft signal threshold judgment and adjustment module.

[0010] The weft threshold signal judgment and adjustment module includes a hysteresis comparison circuit, which is equipped with a threshold adjustment unit. The weft threshold signal judgment and adjustment module outputs a comparison signal and sends it to the electronic control module. The electronic control module is connected to the threshold adjustment unit and determines whether the secondary filter signal is within the set trigger threshold range based on the acquired comparison signal. If it is not within the set trigger threshold range, the threshold adjustment unit is adjusted to adjust the hysteresis threshold voltage, thereby adjusting the trigger threshold range so that the secondary filter signal is within the adjusted trigger threshold range, thus obtaining a reasonable comparison signal pulse.

[0011] Preferably, the photoelectric transmitting and receiving module includes a light-emitting diode D1 and a phototransistor T1. Both the light-emitting diode D1 and the phototransistor T1 are connected to the electronic control module. The electronic control module controls the light-emitting diode D1 to output emitted light, and the electronic control module receives the weft yarn detection signal sent by the phototransistor T1.

[0012] Preferably, the first multi-stage filter circuit includes capacitor C1, digital potentiometer R7, resistor R2, capacitor C2, and comparator U. 1B The components are capacitor C1, resistor R3, and resistor R4; the positive terminal of capacitor C1 is connected to the photoelectric transmitting and receiving module, and the negative terminal of capacitor C1 is connected in series with resistor R2 and then connected to the comparator U. 1B The positive input terminal of resistor R2 is connected to capacitor C2 and then grounded; the comparator U 1B The negative terminal of the input is connected to ground after being connected to resistor R3. The positive terminal of the parallel connection of resistor R4 and capacitor C3 is connected to the positive terminal of resistor R3, and the negative terminal of the parallel connection is connected to the comparator U. 1BThe output terminal of the comparator U 1B The output terminal outputs a first-level filtered signal; the negative terminal of the capacitor C1 is connected to the digital potentiometer R7 and then grounded.

[0013] Preferably, the electronic control module is connected to the digital potentiometer R7 to adjust the resistance value of the digital potentiometer R7; the bandwidth adjustment unit is the digital potentiometer R7, and the filtering bandwidth of the first-stage filtering module is adjusted by adjusting the resistance value of the digital potentiometer R7.

[0014] Preferably, the second multi-stage filter circuit includes capacitor C4, resistor R5, resistor R6, capacitor C5, and comparator U. 2B And digital potentiometer R8; the positive terminal of capacitor C4 is connected to the first-stage filter module, and the negative terminal of capacitor C4 is connected in series with resistor R6 and then connected to comparator U. 2B The positive input terminal of resistor R6 is connected to capacitor C5 and then grounded; the negative terminal of capacitor C4 is connected to resistor R5 and then grounded; the positive terminal of digital potentiometer R8 is connected to comparator U. 2B The negative input terminal is connected to the comparator U. 2B The output terminal of the comparator U 2B The output terminal outputs a secondary filtered signal.

[0015] Preferably, the electronic control module is connected to a digital potentiometer R8 to adjust the resistance value of the digital potentiometer R8; the gain adjustment unit is the digital potentiometer R8, and the gain of the secondary filter module is adjusted by adjusting the resistance value of the digital potentiometer R8.

[0016] Preferably, the hysteresis comparator circuit includes resistor R9 and resistor R 10 Resistance R 12 Comparator U 3B and digital potentiometer R 13 The comparator U 3B The negative input terminal of the comparator is connected to the secondary filter module. 3B The positive input terminal of the comparator U is connected to ground after being connected to resistor R9. 3B The positive input terminal is connected to resistor R. 10 The negative terminal of the resistor R 10 The positive terminal is connected to the power supply V. EF1 The resistor R 12 The positive terminal is connected to the power supply V. EF1 The resistor R 12 The negative terminal is connected to comparator U. 3B The output terminal of the digital potentiometer R 13 The two ends are respectively connected to the comparator U 3BThe positive input terminal and the comparator U 3B The output terminal of the comparator U 3B The output terminal outputs a comparison signal.

[0017] Preferably, the electronic control module is connected to the digital potentiometer R. 13 To adjust the digital potentiometer R 13 The resistance value; the threshold adjustment unit is the digital potentiometer R. 13 By adjusting the digital potentiometer R 13 The resistance value is adjusted to determine the hysteresis threshold voltage of the weft yarn threshold signal judgment and adjustment module.

[0018] Preferably, the electronic control module includes a digital processing chip U4, which stores parameters for adjusting the bandwidth adjustment unit, the gain adjustment unit, and the threshold adjustment unit.

[0019] Compared with the prior art, the technical solution of this utility model embodiment has beneficial effects.

[0020] The weft yarn adaptive detection device for weft feeders provided by this utility model automatically adapts to weft yarns of different thicknesses, colors, and reflectivities by detecting feedback signals from different types of weft yarns and adjusting bandwidth and gain according to the identification and output control of the feedback signals through an electronic control module. This achieves the optimal weft yarn detection effect, thereby improving the stable operation efficiency of the weft feeder and increasing the efficiency of the loom. At the same time, the adaptive identification and adjustment of weft yarns reduces the installation and debugging difficulty for machine operators. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the weft yarn adaptive detection device for the weft feeder in this embodiment of the present invention;

[0022] Figure 2 This is a circuit diagram of the weft yarn adaptive detection device used in the weft feeder in this embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1- Photoelectric transmitting and receiving module; 2- Primary filtering module; 3- Secondary filtering module; 4- Weft yarn threshold signal judgment and adjustment module; 5- Electronic control module. Detailed Implementation

[0025] To make the objectives, features, and beneficial effects of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described below are merely for explaining this utility model and are not intended to limit it. Furthermore, the same or similar reference numerals may be used in the drawings to refer to the same or similar elements in different embodiments, and descriptions of the same or similar elements in different embodiments, as well as descriptions of prior art elements, features, effects, etc., may be omitted.

[0026] Reference Figures 1 to 2 This utility model provides a weft yarn adaptive detection device for a weft feeder.

[0027] Specifically, it includes photoelectric transmitting and receiving module 1, primary filtering module 2, secondary filtering module 3, weft threshold signal judgment and adjustment module 4, and electronic control module 5;

[0028] The photoelectric transmitting and receiving module 1 detects the weft yarn and sends the weft yarn detection signal to the first-stage filtering module 2 and the electronic control module 5.

[0029] The first-stage filtering module 2 includes a first multi-stage filtering circuit, which is equipped with a bandwidth adjustment unit. The first-stage filtering module 2 conditions the weft detection signal into a first-stage filtered signal and sends it to the second-stage filtering module 3 and the electronic control module 5. The electronic control module 5 is connected to the bandwidth adjustment unit and adjusts the bandwidth adjustment unit based on the comparison between the acquired first-stage filtered signal and the internal set parameters, thereby adjusting the filtering bandwidth of the first-stage filtering module 2.

[0030] The secondary filtering module 3 includes a second multi-stage filtering circuit, which is equipped with a gain adjustment unit. The secondary filtering module 3 conditions the primary filtering signal into a secondary filtering signal and sends it to the weft threshold signal judgment and adjustment module 4 and the electronic control module 5. The electronic control module 5 is connected to the gain adjustment unit and adjusts the gain of the secondary filtering module 3 by comparing the acquired secondary filtering signal with the initial setting value of the weft signal threshold judgment and adjustment module 4.

[0031] The weft threshold signal judgment and adjustment module 4 includes a hysteresis comparison circuit, which is equipped with a threshold adjustment unit. The weft threshold signal judgment and adjustment module 4 outputs a comparison signal and sends it to the electronic control module 5. The electronic control module 5 is connected to the threshold adjustment unit and determines whether the secondary filter signal is within the set trigger threshold range based on the acquired comparison signal. If it is not within the set trigger threshold range, the threshold adjustment unit is adjusted to adjust the hysteresis threshold voltage, thereby adjusting the trigger threshold range so that the secondary filter signal is within the adjusted trigger threshold range, and a reasonable comparison signal pulse is obtained.

[0032] In some embodiments, the photoelectric transmitting and receiving module 1 includes a light-emitting diode D1 and a phototransistor T1. Both the light-emitting diode D1 and the phototransistor T1 are connected to the electronic control module 5. The electronic control module 5 controls the light-emitting diode D1 to output emitted light and receives the weft detection signal sent by the phototransistor T1.

[0033] In some embodiments, the first multi-stage filter circuit includes capacitor C1, digital potentiometer R7, resistor R2, capacitor C2, and comparator U. 1B The components include capacitor C3, resistor R3, and resistor R4; the positive terminal of capacitor C1 is connected to the photoelectric transmitter and receiver module 1, and the negative terminal of capacitor C1 is connected to comparator U after being connected in series with resistor R2. 1B The positive input terminal of R2 is connected to the negative terminal of capacitor C2 and then grounded; comparator U 1B The negative input terminal is connected to ground via resistor R3. The positive terminal of the parallel connection of resistor R4 and capacitor C3 is connected to the positive terminal of resistor R3, and the negative terminal of the parallel connection is connected to comparator U. 1B The output of comparator U 1B The output terminal outputs a first-stage filtered signal; the negative terminal of capacitor C1 is connected to digital potentiometer R7 and then grounded.

[0034] In some embodiments, the electronic control module 5 is connected to the digital potentiometer R7 to adjust the resistance value of the digital potentiometer R7; the bandwidth adjustment unit is the digital potentiometer R7, and the filtering bandwidth of the first-stage filtering module 2 is adjusted by adjusting the resistance value of the digital potentiometer R7.

[0035] In some embodiments, the second multi-stage filter circuit includes capacitor C4, resistor R5, resistor R6, capacitor C5, and comparator U. 2B The positive terminal of capacitor C4 is connected to the first-stage filter module 2, and the negative terminal of capacitor C4 is connected to comparator U after being connected in series with resistor R6. 2B The positive input terminal of resistor R6 is connected to ground via capacitor C5; the negative terminal of capacitor C4 is connected to ground via resistor R5; the positive terminal of digital potentiometer R8 is connected to comparator U. 2B The negative input terminal is connected to comparator U. 2B The output of comparator U 2B The output terminal outputs a secondary filtered signal.

[0036] In some embodiments, the electronic control module 5 is connected to the digital potentiometer R8 to adjust the resistance value of the digital potentiometer R8; the gain adjustment unit is the digital potentiometer R8, and the gain of the secondary filter module 3 is adjusted by adjusting the resistance value of the digital potentiometer R8.

[0037] In some embodiments, the hysteresis comparator circuit includes resistor R9 and resistor R 10 Resistance R 12Comparator U 3B and digital potentiometer R 13 Comparator U 3B The negative input terminal is connected to the secondary filter module 3, comparator U 3B The positive input terminal is connected to ground after resistor R9, and comparator U 3B The positive input terminal is connected to resistor R. 10 The negative terminal, resistor R 10 The positive terminal is connected to the power supply V. EF1 resistance R 12 The positive terminal is connected to the power supply V. EF1 resistance R 12 The negative terminal is connected to comparator U. 3B The output terminal of the digital potentiometer R 13 The two ends are respectively connected to comparator U 3B The positive input and comparator U 3B The output of comparator U 3B The output terminal outputs a comparison signal.

[0038] In some embodiments, the electronic control module 5 is connected to the digital potentiometer R. 13 To adjust the digital potentiometer R 13 The resistance value; the threshold adjustment unit is a digital potentiometer R. 13 By adjusting the digital potentiometer R 13 The resistance value is adjusted to determine the hysteresis threshold voltage of the weft yarn threshold signal in the adjustment module 4.

[0039] In some embodiments, the electronic control module 5 includes a digital processing chip U4, which stores parameters of the bandwidth adjustment unit, the gain adjustment unit, and the threshold adjustment unit.

[0040] The weft yarn adaptive detection device for a weft feeder provided by this utility model, in its specific implementation, detects different types of weft yarns during factory debugging, obtains corresponding weft yarn detection signals, and adjusts the bandwidth and gain through the electronic control module 5 based on the identification and output control of the corresponding weft yarn detection signals. It automatically adapts to the detection of weft yarns of different thicknesses, colors, and reflectivities, and stores the parameters of the bandwidth adjustment unit, gain adjustment unit, and threshold adjustment unit. In actual use, it can automatically identify and adjust the signal bandwidth and gain according to the different types of weft yarns being used by the weft feeder.

[0041] In summary, the weft yarn adaptive detection device for weft feeders provided by this utility model automatically adapts to weft yarns of different thicknesses, colors, and reflectivities by detecting feedback signals from different types of weft yarns and adjusting the bandwidth and gain of the electronic control module 5 based on the recognition and output control of the feedback signals. This achieves the optimal weft yarn detection effect, thereby improving the stable operation efficiency of the weft feeder and increasing the efficiency of the loom. At the same time, the adaptive recognition and adjustment of the weft yarn reduces the installation and debugging difficulty for machine operators.

[0042] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of this utility model disclosure, even when only a single embodiment is described with respect to a particular feature. The feature examples provided in this utility model disclosure are intended to be illustrative and not limiting, unless otherwise stated. In practice, one or more technical features of the dependent claims may be combined with the technical features of the independent claims as needed and where technically feasible, and may be derived from the technical features of the respective independent claims in any suitable manner rather than solely by the specific combinations listed in the claims.

Claims

1. A weft yarn adaptive detection device for a weft feeder, characterized in that, It includes a photoelectric transmitting and receiving module, a first-stage filtering module, a second-stage filtering module, a weft yarn threshold signal judgment and adjustment module, and an electronic control module; The photoelectric transmitting and receiving module detects the weft yarn and sends a weft yarn detection signal to the first-level filtering module and the electronic control module. The first-stage filtering module includes a first multi-stage filtering circuit, which is equipped with a bandwidth adjustment unit. The first-stage filtering module conditions the weft detection signal into a first-stage filtered signal and sends it to the second-stage filtering module and the electronic control module. The electronic control module is connected to the bandwidth adjustment unit and adjusts the bandwidth adjustment unit based on the comparison between the acquired first-stage filtered signal and the internal set parameters, thereby adjusting the filtering bandwidth of the first-stage filtering module. The secondary filtering module includes a second multi-stage filtering circuit, which is equipped with a gain adjustment unit. The secondary filtering module conditions the primary filtering signal into a secondary filtering signal and sends it to the weft threshold signal judgment and adjustment module and the electronic control module. The electronic control module is connected to the gain adjustment unit and adjusts the gain of the secondary filtering module by comparing the acquired secondary filtering signal with the initial setting value of the weft signal threshold judgment and adjustment module. The weft threshold signal judgment and adjustment module includes a hysteresis comparison circuit, which is equipped with a threshold adjustment unit. The weft threshold signal judgment and adjustment module outputs a comparison signal and sends it to the electronic control module. The electronic control module is connected to the threshold adjustment unit and determines whether the secondary filter signal is within the set trigger threshold range based on the acquired comparison signal. If it is not within the set trigger threshold range, the threshold adjustment unit is adjusted to adjust the hysteresis threshold voltage, thereby adjusting the trigger threshold range so that the secondary filter signal is within the adjusted trigger threshold range, thus obtaining a reasonable comparison signal pulse.

2. The weft yarn adaptive detection device for a weft feeder according to claim 1, characterized in that, The photoelectric transmitting and receiving module includes a light-emitting diode D1 and a phototransistor T1. Both the light-emitting diode D1 and the phototransistor T1 are connected to the electronic control module. The electronic control module controls the light-emitting diode D1 to output emitted light and receives the weft yarn detection signal sent by the phototransistor T1.

3. The weft yarn adaptive detection device for a weft feeder according to claim 1, characterized in that, The first multi-stage filter circuit includes capacitor C1, digital potentiometer R7, resistor R2, capacitor C2, and comparator U. 1B The components are capacitor C1, resistor R3, and resistor R4; the positive terminal of capacitor C1 is connected to the photoelectric transmitting and receiving module, and the negative terminal of capacitor C1 is connected in series with resistor R2 and then connected to the comparator U. 1B The positive input terminal of resistor R2 is connected to capacitor C2 and then grounded; the comparator U 1B The negative terminal of the input is connected to ground after being connected to resistor R3. The positive terminal of the parallel connection of resistor R4 and capacitor C3 is connected to the positive terminal of resistor R3, and the negative terminal of the parallel connection is connected to the comparator U. 1B The output terminal of the comparator U 1B The output terminal outputs a first-level filtered signal; the negative terminal of the capacitor C1 is connected to the digital potentiometer R7 and then grounded.

4. The weft yarn adaptive detection device for a weft feeder according to claim 3, characterized in that, The electronic control module is connected to the digital potentiometer R7 to adjust the resistance value of the digital potentiometer R7; the bandwidth adjustment unit is the digital potentiometer R7, and the filtering bandwidth of the first-stage filtering module is adjusted by adjusting the resistance value of the digital potentiometer R7.

5. The weft yarn adaptive detection device for a weft feeder according to claim 1, characterized in that, The second multi-stage filter circuit includes capacitor C4, resistor R5, resistor R6, capacitor C5, and comparator U. 2B And digital potentiometer R8; the positive terminal of capacitor C4 is connected to the first-stage filter module, and the negative terminal of capacitor C4 is connected in series with resistor R6 and then connected to comparator U. 2B The positive input terminal of resistor R6 is connected to capacitor C5 and then grounded; the negative terminal of capacitor C4 is connected to resistor R5 and then grounded; the positive terminal of digital potentiometer R8 is connected to comparator U. 2B The negative input terminal is connected to the comparator U. 2B The output terminal of the comparator U 2B The output terminal outputs a secondary filtered signal.

6. The weft yarn adaptive detection device for a weft feeder according to claim 5, characterized in that, The electronic control module is connected to the digital potentiometer R8 to adjust the resistance value of the digital potentiometer R8; the gain adjustment unit is the digital potentiometer R8, and the gain of the secondary filter module is adjusted by adjusting the resistance value of the digital potentiometer R8.

7. The weft yarn adaptive detection device for a weft feeder according to claim 1, characterized in that, The hysteresis comparator circuit includes resistor R9 and resistor R. 10 Resistance R 12 Comparator U 3B and digital potentiometer R 13 The comparator U 3B The negative input terminal of the comparator is connected to the secondary filter module. 3B The positive input terminal of the comparator U is connected to ground after being connected to resistor R9. 3B The positive input terminal is connected to resistor R. 10 The negative terminal of the resistor R 10 The positive terminal is connected to the power supply V. EF1 The resistor R 12 The positive terminal is connected to the power supply V. EF1 The resistor R 12 The negative terminal is connected to comparator U. 3B The output terminal of the digital potentiometer R 13 The two ends are respectively connected to the comparator U 3B The positive input terminal and the comparator U 3B The output terminal of the comparator U 3B The output terminal outputs a comparison signal.

8. The weft yarn adaptive detection device for a weft feeder according to claim 7, characterized in that, The electronic control module is connected to the digital potentiometer R. 13 To adjust the digital potentiometer R 13 The resistance value; the threshold adjustment unit is the digital potentiometer R. 13 By adjusting the digital potentiometer R 13 The resistance value is adjusted to determine the hysteresis threshold voltage of the weft yarn threshold signal judgment and adjustment module.

9. The weft yarn adaptive detection device for a weft feeder according to claim 1, characterized in that, The electronic control module includes a digital processing chip U4, which stores parameters for adjusting the bandwidth adjustment unit, the gain adjustment unit, and the threshold adjustment unit.

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