CN115216878A - Weft detecting circuit, device and method for air jet loom - Google Patents
Weft detecting circuit, device and method for air jet loom Download PDFInfo
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
- D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
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- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
- D03D51/18—Automatic stop motions
- D03D51/34—Weft stop motions
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Abstract
The application discloses air jet loom weft detection circuit, device and method, this air jet loom weft detection circuit includes: the weft detecting module is used for detecting weft yarns and outputting corresponding weft detecting signals; the signal processing module is used for carrying out signal processing on the weft detection signal and outputting a corresponding direct current offset feedback signal, a weft detection feedback signal and a weft detection head feedback signal; and the MCU is used for performing closed-loop feedback regulation on the direct-current bias voltage of the air jet loom according to the direct-current bias feedback signal, performing closed-loop feedback regulation on the weft detection sensitivity of the air jet loom according to the weft detection feedback signal, and performing closed-loop feedback regulation on the weft detection head state of the air jet loom according to the weft detection head feedback signal. The automatic weft detecting method and device for the air jet loom have the advantages that the automatic detection and adjustment of the weft detecting sensitivity, the direct-current bias voltage and the weft detecting head state of the air jet loom are achieved, a user does not need to manually adjust the weft detecting head state on a pure hardware circuit, and therefore simplicity and convenience in achieving the weft detecting function of the air jet loom are improved.
Description
Technical Field
The application relates to the technical field of air jet looms, in particular to a weft detecting circuit, device and method of an air jet loom.
Background
When the air jet loom works, the weft detecting mechanism is one of five mechanisms of the coefficient of the air jet loom and is used for judging whether fabric weft yarns are normal or not so as to ensure the quality of the weft yarns produced by the air jet loom.
Disclosure of Invention
The application mainly aims to provide a weft detecting circuit, a weft detecting device and a weft detecting method of an air jet loom, and aims to improve the simplicity of weft detecting function realization of the air jet loom.
In order to achieve the above object, the present application provides a weft detecting circuit for an air jet loom, the weft detecting circuit for an air jet loom comprising:
the weft detecting module is used for detecting weft yarns and outputting corresponding weft detecting signals;
the signal processing module is used for carrying out signal processing on the weft detection signal and outputting a weft detection head feedback signal corresponding to the weft detection signal, wherein the signal processing module comprises a signal amplification unit which is used for carrying out signal amplification in the process of carrying out signal processing on the weft detection signal;
and the MCU (Microcontroller Unit, a micro control Unit) is used for judging whether weft detection is successful according to the weft detection head feedback signal and carrying out closed-loop feedback regulation on the signal amplification factor of the signal amplification Unit according to the weft detection head feedback signal so as to adjust the weft detection sensitivity of the air jet loom.
Optionally, the MCU unit is configured to acquire a first square wave number of pulse square waves in a preset phase range in the weft feeler feedback signal, and determine whether weft feeler is successful according to the first square wave number.
Optionally, the MCU unit is configured to generate a sensitivity adjustment signal according to the first square wave number if weft detection is not successful, and perform closed-loop feedback adjustment on the signal amplification factor of the signal amplification unit by outputting the sensitivity adjustment signal to the signal amplification unit;
if the weft detecting is successful, acquiring the number of second square waves of pulse square waves which are not in a preset phase range in the weft detecting head feedback signals, if the number of the second square waves is larger than a preset square wave number threshold value, generating sensitivity adjusting signals according to the number of the second square waves, and outputting the sensitivity adjusting signals to the signal amplifying unit to perform closed-loop feedback adjustment on the signal amplifying multiple of the signal amplifying unit.
Optionally, the signal amplification unit is further configured to output a dc bias signal to the MCU unit;
the MCU unit is also used for generating a direct current bias adjusting signal according to the direct current bias signal and outputting the direct current bias adjusting signal to the signal amplifying unit so as to carry out closed-loop feedback adjustment on the direct current bias voltage of the signal amplifying unit.
Optionally, the weft detecting module comprises a weft detecting head and a first filtering unit,
the weft feeler is used for acquiring weft feeler signals and outputting the weft feeler signals to the first filtering unit and the signal processing module;
the first filtering unit is used for filtering the weft detecting signal and outputting a corresponding weft detecting head feedback signal to the MCU unit;
and the MCU is also used for detecting the state of the weft feeler according to the amplitude of the weft feeler feedback signal.
Optionally, the signal processing module comprises a second filtering unit, a signal amplifying unit and a hysteresis comparator,
the second filtering unit is used for filtering the weft detecting signal and outputting a corresponding filtering signal;
the signal amplification unit is used for amplifying the filtering processing signal and outputting a corresponding amplification signal;
and the hysteresis comparator is used for performing hysteresis comparison on the amplified signals and outputting corresponding weft feeler feedback signals.
Optionally, the weft detecting circuit of the air jet loom further comprises a weft detecting driving circuit,
the MCU is also used for generating a drive circuit control signal and outputting the drive circuit control signal to the weft detecting drive circuit;
and the weft detection driving circuit is used for controlling the weft detection module to detect weft yarns according to the driving circuit control signal.
In addition, the application also provides a weft detecting method of the air jet loom, which comprises the following steps:
weft yarn detection is carried out on an air-jet loom, and weft detecting signals are collected;
performing signal processing on the weft feeler signal to obtain a weft feeler feedback signal, wherein the signal processing mode comprises signal amplification;
and judging whether weft detection is successful or not according to the weft detection head feedback signal, and carrying out closed-loop feedback regulation on the signal amplification factor according to the weft detection head feedback signal so as to adjust the weft detection sensitivity of the air jet loom.
Optionally, the step of determining whether the weft insertion is successful according to the weft insertion head feedback signal includes:
acquiring the first square wave quantity of pulse square waves in a preset phase range in the weft feeler feedback signal;
and judging whether weft detection is successful or not according to the quantity of the first square waves.
Optionally, the step of performing closed-loop feedback adjustment on the signal amplification factor according to the weft feeler feedback signal to adjust the weft feeler sensitivity of the air jet loom includes:
if the weft detection is not successful, generating a sensitivity adjusting signal according to the first square wave number;
performing closed-loop feedback regulation on the signal amplification factor according to the sensitivity regulation signal;
if the weft detection is successful, acquiring the second square wave number of the pulse square waves which are not in the preset phase range in the weft detection head feedback signal;
if the number of the second square waves is larger than a preset square wave number threshold value, generating a sensitivity adjusting signal according to the number of the second square waves;
and carrying out closed-loop feedback regulation on the signal amplification factor according to the sensitivity regulation signal.
Optionally, the air-jet loom weft detecting method further comprises:
acquiring a direct current bias signal generated during signal amplification, and generating a corresponding direct current bias adjusting signal according to the direct current bias signal;
and performing closed-loop feedback regulation on the direct current bias voltage during signal amplification according to the direct current bias regulation signal.
Optionally, after the step of acquiring a weft detection signal by performing weft detection on the air jet loom, the air jet loom weft detection method further includes:
carrying out filtering processing on the weft feeler signal to obtain a weft feeler feedback signal;
and detecting the state of the weft feeler according to the amplitude of the weft feeler feedback signal to obtain a weft feeler state detection result.
In addition, the application also provides an air-jet loom weft detection device, the air-jet loom weft detection device comprises an air-jet loom weft detection circuit, the air-jet loom weft detection circuit is used for controlling the air-jet loom weft detection process of the air-jet loom weft detection device, and the air-jet loom weft detection circuit is configured as the air-jet loom weft detection circuit.
The application discloses a weft detection circuit of an air jet loom, which comprises a weft detection module, a signal processing module and an MCU (microprogrammed control unit), wherein the weft detection module is used for detecting weft yarns and outputting corresponding weft detection signals; the signal processing module is used for carrying out signal processing on the weft detection signal and outputting a corresponding direct current offset feedback signal, a weft detection feedback signal and a weft detection head feedback signal; and the MCU is used for performing closed-loop feedback regulation on the direct-current bias voltage of the air jet loom according to the direct-current bias feedback signal, performing closed-loop feedback regulation on the weft detection sensitivity of the air jet loom according to the weft detection feedback signal, and performing closed-loop feedback regulation on the weft detection head state of the air jet loom according to the weft detection head feedback signal. The closed-loop feedback adjustment of the direct-current bias voltage, the weft detecting sensitivity and the weft detecting head state of the air jet loom is realized, the direct-current bias voltage, the weft detecting sensitivity and the weft detecting head state of the air jet loom can be automatically fed back and adjusted while weft detection is realized, manual adjustment on a pure hardware circuit is not needed, and therefore the simplicity of achieving the weft detecting function of the air jet loom is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a block diagram of an embodiment of a weft detecting circuit of a conventional air jet loom;
FIG. 2 is a block diagram of an embodiment of a weft detection circuit of the air jet loom of the present application;
FIG. 3 is a schematic structural view of an embodiment of the weft feeler of the present application;
FIG. 4 is a schematic block diagram of another embodiment of a weft detection circuit for an air jet loom according to the present application;
FIG. 5 is a block diagram of a weft detecting circuit of an air jet loom according to another embodiment of the present application;
fig. 6 is a schematic flow chart of an embodiment of a weft detecting method of an air jet loom in the application.
The implementation, functional features and advantages of the object of the present application will be further explained with reference to the embodiments, and with reference to the accompanying drawings.
The reference numbers illustrate:
| reference numerals | Name(s) | Reference numerals | Name (R) |
| 100 | |
201 | |
| 200 | |
202 | |
| 300 | |
203 | |
| 400 | Weft detection driving circuit | 201a | Band-pass filter unit |
| 500 | Display unit | 201b | |
| 101 | Weft feeler | 201c | Band |
| 102 | First filter unit | 201d | High-pass filtering unit |
| A01-A02 | First closed loop feedback regulation | B01-B02 | Second closed loop feedback regulation |
| C01-C02 | Third closed loop feedback regulation |
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without inventive step, are within the scope of the present disclosure.
It should be noted that the description in this application referring to "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope claimed in the present application.
Currently, a pure hardware circuit is usually adopted for realizing weft detection of an air jet loom, and referring to fig. 1, a weft detection signal (H1 or H2) generated by a weft detector is processed by analog signals of circuits such as band-pass filtering, envelope detection, band-stop filtering, high-pass filtering, in-phase amplification, hysteresis comparison and the like, and a weft detector can identify whether weft passes through the weft detector and feed back the weft state to a main control board. The in-phase amplification circuit is provided with a direct current bias potentiometer and a sensitivity potentiometer, a user can adjust direct current bias voltage of the in-phase amplification circuit by manually adjusting the direct current bias potentiometer, the user can adjust sensitivity of weft detection by manually adjusting the sensitivity potentiometer, but the direct current bias potentiometer and the sensitivity potentiometer are usually installed in a control cabinet of the air jet loom, manual adjustment is very inconvenient, and meanwhile, the state of a weft detection head cannot be automatically detected and adjusted.
The application provides an air jet loom weft detection circuit mainly refers to fig. 2, in this application embodiment, air jet loom weft detection circuit includes:
the weft detecting module 100 is used for detecting weft on the air jet loom and outputting weft detecting signals acquired through the weft detecting; the weft detecting module 100 at least comprises a weft detecting head, and referring to fig. 3, the weft detecting head comprises a light emitter and a light receiver, the light emitter emits light to irradiate on the weft, the light receiver receives an optical signal reflected by the weft, so that the optical signal is converted into a corresponding electrical signal, the electrical signal is a weft detecting signal, and the weft detecting signal is used for representing the state of the weft.
As an example, the weft detecting module 100 includes a first weft detector installed in a vicinity of the weft yarn for outputting a short weft signal representing a short weft state of the weft yarn as a weft detecting signal, and a second weft detector installed at a distance from the weft yarn greater than a distance between the first weft detector and the weft yarn for outputting a long weft signal representing a long weft state of the weft yarn as a weft detecting signal.
And the signal processing module 200 is configured to perform signal processing on the weft detection signal, and output a corresponding dc offset feedback signal, weft detection feedback signal, and weft detection head feedback signal, where the signal processing modes include analog signal processing modes such as filtering, in-phase amplification, and hysteresis comparison.
The MCU 300 is used for performing closed-loop feedback regulation on the direct-current bias voltage of the air jet loom according to the direct-current bias feedback signal, performing closed-loop feedback regulation on the weft detection sensitivity of the air jet loom according to the weft detection feedback signal, and performing closed-loop feedback regulation on the weft detection head state of the air jet loom according to the weft detection head feedback signal. The direct current bias feedback signal is a signal used for reflecting the direct current bias voltage of the air jet loom; the weft detecting feedback signal is a signal for reflecting a weft detecting result, and the weft detecting result can be information such as whether weft detecting is successful or weft state; the weft feeler feedback signal is a signal for reflecting the state of the weft feeler, and the state of the weft feeler can be whether the weft feeler is dirty or not, whether the weft feeler is at an angle or whether the weft feeler is damaged or not.
A first closed-loop feedback regulation A01-A02 exists between the signal processing module 200 and the MCU unit 300, the signal processing module 200 inputs a direct current bias feedback signal to the MCU unit 300 through the first closed-loop feedback regulation A01-A02, and receives a direct current bias regulation signal generated by the MCU unit 300 based on the direct current bias feedback signal to regulate the direct current bias voltage of the air jet loom, so as to form closed-loop feedback regulation on the direct current bias voltage; a second closed-loop feedback regulation B01-B02 exists between the signal processing module 200 and the MCU 300, the signal processing module 200 inputs a weft detection feedback signal to the MCU 300 through the second closed-loop feedback regulation B01-B02, receives a sensitivity regulation signal generated by the MCU 300 based on the weft detection feedback signal, and regulates the weft detection sensitivity of the air jet loom, so that the closed-loop feedback regulation of the weft detection sensitivity is formed; a third closed-loop feedback adjustment signal C01-C02 exists between the signal processing module 200 and the MCU unit 300, the signal processing module 200 inputs a weft feeler feedback signal to the MCU unit 300 through the third closed-loop feedback adjustment signal C01-C02, the MCU unit 300 generates a corresponding weft feeler driving adjustment signal based on the weft feeler feedback signal, so that the MCU unit 300 adjusts the weft feeler driving adjustment signal according to the weft feeler driving adjustment signal, wherein the weft feeler driving signal is used to control the state of the weft feeler during weft feeler, so as to drive the weft feeler to perform weft detection, generate a new weft feeler signal, and thus form a closed-loop feedback adjustment of the state of the weft feeler.
As an example, referring to fig. 4, the signal processing module 200 further includes a second filtering unit 201, a signal amplifying unit 202, and a hysteresis comparator 203, where the second filtering unit 201 is configured to perform filtering processing on the weft-detecting signal to remove noise in the weft-detecting signal, so as to output a filtered signal corresponding to the weft-detecting signal; the signal amplifying unit 202 is configured to amplify the amplitude of the filtered signal and output an amplified signal corresponding to the filtered signal to the hysteresis comparator 203, and the signal amplifying unit 202 is further configured to output a dc bias feedback signal corresponding to a dc bias voltage used for amplification to the MCU unit 300, where the dc bias feedback signal is used for feeding back the magnitude of the dc bias voltage; the hysteresis comparator 203 is configured to perform hysteresis comparison on the amplified signal, and output a weft detection feedback signal corresponding to the amplified signal to the MCU unit 300.
With continued reference to fig. 4, the weft feeler module 100 further includes a weft feeler 101 and a first filtering unit 102, where the weft feeler 101 is configured to collect weft feeler signals and output the weft feeler signals to the first filtering unit 102 and the signal processing module 200. The first filtering unit 102 is configured to perform filtering processing on the weft detecting signal, and output a corresponding weft detecting head feedback signal to the MCU unit 300.
The MCU unit 300 is further configured to output a corresponding weft detection driving adjustment signal to the weft detection driving circuit 400 according to the weft detection feedback signal, and the weft detection driving circuit 400 is configured to output a weft detection driving signal to the weft detection head 101 according to the weft detection driving adjustment signal to detect and control a weft detection head state of the air jet loom, where the weft detection driving signal is used to drive the weft detection module 100 to perform weft detection, so as to form a third closed-loop feedback adjustment C01-C02 on the weft detection head state of the air jet loom, thereby implementing automatic detection and automatic control on the weft detection head state of the air jet loom, and improving the detection and control simplicity of the weft detection head state of the air jet loom. The weft detection driving adjusting signal can be a PWM control signal.
The MCU 300 is further configured to determine a current dc bias voltage according to an amplitude of the dc bias feedback signal output by the signal amplifying unit, calculate a voltage difference between the current dc bias voltage and a preset dc bias voltage, determine whether the voltage difference is within a preset voltage difference range, generate a corresponding dc bias feedback signal according to the voltage difference if the voltage difference is not within the preset voltage difference range, and output a dc bias adjustment signal to the signal amplifying unit 202, thereby forming a first closed-loop feedback adjustment a01-a02 of the dc bias voltage at the signal amplifying unit 202, so as to perform closed-loop feedback adjustment on the dc bias voltage of the signal amplifying unit 202, until the voltage difference is within the preset voltage difference range, determine that the closed-loop feedback adjustment of the dc bias voltage of the signal amplifying unit 202 is completed. The embodiment of the application realizes the automatic adjustment of the direct current bias voltage of the air jet loom, the direct current bias voltage of the signal amplification unit 202 is not required to be adjusted by manually adjusting the direct current bias potentiometer, and the direct current bias potentiometer is not required to be arranged on the signal amplification circuit, so that the adjustment simplicity of the direct current bias voltage during weft detection of the air jet loom is improved.
As an example, the hysteresis comparator 203 is configured to compare the amplitude of the amplified signal with a preset amplitude threshold, and output a high level if the amplitude is greater than the preset amplitude threshold, and output a low level if the amplitude is not greater than the preset amplitude threshold, so as to output a plurality of discontinuous square waves, where the plurality of discontinuous square waves form the weft detection feedback signal.
The MCU 300 is further configured to generate a corresponding sensitivity adjustment signal according to the number of square waves of the weft-detecting feedback signal output by the hysteresis comparator 203, and output the sensitivity adjustment signal to the signal amplification unit 202 to perform feedback adjustment on the signal amplification factor of the signal amplification unit 202, so as to form a second closed-loop feedback adjustment B01-B02 on the signal amplification factor of the signal amplification unit 202, that is, form a second closed-loop feedback adjustment B01-B02 on the weft-detecting sensitivity of the air jet loom, thereby achieving automatic adjustment of the weft-detecting sensitivity of the air jet loom without manual adjustment by a user, and thus improving the simplicity of adjustment of the weft-detecting sensitivity of the air jet loom.
As an example, referring to fig. 5, the second filtering unit 201 further includes a band-pass filtering unit 201a, an envelope detection unit 201b, a band-stop filtering unit 201c, and a high-pass filtering unit 201d, and the signal amplifying unit 202 may be an in-phase amplifier. The MCU unit 300 is further connected to a display unit 500, and the display unit 500 is configured to display weft insertion information, for example, whether weft insertion is successful or not, and when detecting that the weft insertion head is in a dirty state, display a dirty prompt message of the weft insertion head.
The embodiment of the application discloses a weft detection circuit of an air jet loom, which comprises a weft detection module 100, a signal processing module 200 and an MCU unit 300, wherein the weft detection module 100 is used for detecting weft and outputting a corresponding weft detection signal; the signal processing module 200 is configured to perform signal processing on the weft feeler signal, and output a corresponding dc offset feedback signal, weft feeler feedback signal, and weft feeler feedback signal; the MCU 300 is used for performing closed-loop feedback regulation on the direct-current bias voltage of the air jet loom according to the direct-current bias feedback signal, performing closed-loop feedback regulation on the weft detection sensitivity of the air jet loom according to the weft detection feedback signal, and performing closed-loop feedback regulation on the weft detection head state of the air jet loom according to the weft detection head feedback signal. The closed-loop feedback adjustment of the direct-current bias voltage, the weft detecting sensitivity and the weft detecting head state of the air jet loom is realized, the direct-current bias voltage, the weft detecting sensitivity and the weft detecting head state of the air jet loom can be automatically fed back and adjusted while weft detection is realized, manual adjustment on a pure hardware circuit is not needed, and therefore the simplicity of achieving the weft detecting function of the air jet loom is improved.
Referring to fig. 4, in another embodiment of the present application, it should be noted that although the second filtering unit 201 may remove a noise signal from the weft-detecting signal, so as to output a filtered signal, an interference signal still exists in the filtered signal, but an amplitude of the interference signal is usually smaller than an amplitude of the true weft-detecting signal, so that after passing through the hysteresis comparator 203, the interference signal usually becomes a low level output, and the true weft-detecting signal becomes a high level output, so as to determine whether weft detection is successful according to the number of pulse square waves in the weft-detecting feedback signal. In addition, it should be noted that, through a lot of experiments, it is found that the real weft detecting signal is generally distributed in the preset phase range, preferably, the preset phase range may be 200 degrees to 300 degrees, and the signal outside the preset phase range is generally an interference signal, and the interference signal is generated under the common influence of many factors such as vibration generated when the weft detecting head rotates, the rotating speed of the main shaft of the air jet loom, the thickness of weft yarn varieties, and the material of weft yarn varieties.
The MCU 300 is configured to obtain a first square wave number of the pulse square wave in the weft-detecting feedback signal within a preset phase range, determine that weft detection is successful if the first square wave number is greater than a preset number of weft-detecting successful discrimination square waves, and determine that weft detection is not successful if the first square wave number is not greater than the preset number of weft-detecting successful discrimination square waves.
If the weft-detecting is not successful, it is proved that the number of high levels output by the hysteresis comparator 203 is too small, the amplitude of the amplified signal output by the signal amplifying unit 202 in a preset phase range is too low, and therefore the signal amplification factor of the signal amplifying unit 202 needs to be increased, so that a sensitivity adjusting signal is generated according to the first square wave number, the signal amplification factor of the signal amplifying unit 202 is increased by outputting the sensitivity adjusting signal to the signal amplifying unit 202, so as to increase the weft-detecting sensitivity, until the success of weft-detecting is determined according to the obtained weft-detecting feedback signal, so that a first closed-loop feedback adjustment B01-B02 for the weft-detecting sensitivity is formed, and the successful weft-detecting can be realized by adjusting the weft-detecting sensitivity.
As an example, the sensitivity adjustment signal may be generated according to a difference between the first square wave number and a preset weft-detecting success distinguishing square wave number, and the difference may be used to control an amplitude of the sensitivity adjustment signal, so that an adjustment amplitude of a signal amplification factor may be controlled.
After the weft detection is successful, if an interference signal exists in the weft detection feedback signal, the accuracy of weft detection, for example, the accuracy of weft state detection based on the weft detection feedback signal, may be affected, and therefore the interference signal needs to be removed.
The MCU 300 is further configured to, if the weft detection is successful, obtain a second square wave number of the pulse square waves in the weft detection feedback signal that are not in the preset phase range, and if the second square wave number is greater than a preset square wave number threshold, prove that an interference signal exists in the weft detection feedback signal, that is, the number of high levels output by the hysteresis comparator 203 is excessive, and the amplitude of the amplification signal output by the signal amplification unit 202 in the preset phase range is too high, so that the signal amplification factor needs to be reduced, so as to generate a sensitivity adjustment signal according to the second square wave number, and output the sensitivity adjustment signal to the signal amplification unit 202, so as to reduce the signal amplification factor of the signal amplification unit 202 until the first square wave number of the pulse square waves in the preset phase range in the obtained weft detection feedback signal is greater than the preset square wave number, and further form a second closed loop adjustment B01-B02 for the sensitivity of the weft detection by adjusting the number of the weft detection feedback signal, so as to improve the detection accuracy of the weft detection by removing the interference signal.
With continued reference to fig. 4, in another embodiment of the present application, the weft detecting module 100 further includes a weft detecting head 101 and a first filtering unit 102, and the weft detecting head is configured to collect weft detecting signals and output the weft detecting signals to the first filtering unit 102 and the signal processing module 200; the first filtering unit 102 is configured to perform filtering processing on the weft feeler signal and output a weft feeler feedback signal to the MCU unit 300, where the weft feeler feedback signal is used to represent a state of the weft feeler; the MCU unit 300 is further configured to detect the state of the weft feeler according to the amplitude of the weft feeler feedback signal. The first filtering unit 102 may be a filter such as an LC filter or an RC filter, and the state of the weft feeler may be an unpowered state, a dirty state, and a normal powered state, for example, when the weft blown by the air jet of the weft feeler is blocked, the weft feeler is considered to be in the dirty state.
As an example, if the amplitude of the weft feeler feedback signal is not greater than a preset first amplitude threshold, determining that the weft feeler is in a non-powered state; if the amplitude of the weft feeler feedback signal is larger than a preset first amplitude threshold and smaller than a preset second amplitude threshold, judging that the weft feeler is in a dirty state; and if the amplitude of the weft feeler feedback signal is not smaller than a preset second amplitude threshold, judging that the weft feeler is in a normal power-on state. For example, the amplitude of the weft feeler feedback signal may be the voltage of the weft feeler, if the voltage is not greater than 1.6 volts, it is determined that the weft feeler is in a non-powered state, if the voltage is greater than 1.6 volts and less than 3.0 volts, it is determined that the weft feeler is in a dirty state, and if the voltage is not less than 3.0 volts, it is determined that the weft feeler is in a normal powered state. This application embodiment has set up first filtering unit 102 in weft finding module 100, first filtering unit 102 converts the weft finding signal that the weft finding head gathered into weft finding head feedback signal, and to output weft finding head feedback signal to MCU unit 300, thereby can realize the purpose of real-time supervision weft finding head state, thereby can in time remind the user to clear up the weft finding head when the weft finding head is in dirty state, prevent that air jet loom from producing the defective products because the weft finding head is dirty, can promote air jet loom's yields.
Based on the weft detecting circuit of the air jet loom, the present application provides a weft detecting method of the air jet loom, mainly referring to fig. 6, in an embodiment of the present application, the weft detecting method of the air jet loom includes:
step S10, weft yarn detection is carried out on the air jet loom, and weft detection signals are collected;
step S20, performing signal processing on the weft feeler signal to obtain a direct current offset feedback signal, a weft feeler feedback signal and a weft feeler feedback signal;
and S30, performing closed-loop feedback regulation on the direct-current bias voltage of the air jet loom according to the direct-current bias feedback signal, performing closed-loop feedback regulation on the weft detection sensitivity of the air jet loom according to the weft detection feedback signal, and performing closed-loop feedback regulation on the weft detection head state of the air jet loom according to the weft detection head feedback signal.
As an example, the signal processing mode includes signal amplification, and the closed-loop feedback adjustment of the weft detection sensitivity of the air jet loom according to the weft detection feedback signal includes:
a10, acquiring the number of first square waves of pulse square waves in a preset phase range in the weft detecting feedback signal, and judging whether weft detecting is successful or not according to the number of the first square waves;
step A20, if weft detection is not successful, performing closed-loop feedback regulation on the signal amplification multiple according to a sensitivity regulation signal generated by the first square wave number so as to regulate the weft detection sensitivity of the air jet loom;
step A30, if weft detection is successful, acquiring the number of second square waves of pulse square waves which are not in a preset phase range in the weft detection feedback signals;
step A40, if the number of the second square waves is larger than a preset square wave number threshold value, generating a sensitivity adjusting signal according to the number of the second square waves;
and A50, performing closed-loop feedback regulation on the amplification factor of the signal according to the sensitivity regulation signal so as to regulate the weft detecting sensitivity of the air jet loom.
As an example, the signal processing manner includes signal amplification, and the closed-loop feedback adjustment of the dc bias voltage of the air jet loom according to the dc bias feedback signal includes:
step B10, acquiring a direct current bias feedback signal generated during signal amplification, and generating a corresponding direct current bias adjusting signal according to the direct current bias feedback signal;
and B20, performing closed-loop feedback regulation on the direct current bias voltage during signal amplification according to the direct current bias regulation signal.
As an example, the closed-loop feedback adjustment of the weft feeler state of the air jet loom according to the weft feeler feedback signal includes:
step C10, adjusting the generated weft detection driving signal according to the weft detection head feedback signal, wherein the weft detection driving signal is used for driving a weft detection module of the air jet loom to detect weft yarns;
and step C20, performing closed-loop feedback regulation on the weft detecting head state of the air jet loom according to the regulated weft detecting driving signal.
It can be understood that, because the weft detecting circuit of the air jet loom is used in the weft detecting method of the air jet loom, the embodiment of the weft detecting method of the air jet loom includes all technical solutions of all embodiments of the weft detecting circuit of the air jet loom, and the achieved technical effects are also completely the same, and are not described herein again.
In addition, the air jet loom weft detection device comprises the air jet loom weft detection circuit, and it can be understood that the air jet loom weft detection circuit is used in the air jet loom weft detection device, so that the embodiment of the air jet loom weft detection device comprises all technical schemes of all embodiments of the air jet loom weft detection circuit, the achieved technical effects are completely the same, and the details are not repeated herein.
The above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application, and all modifications, equivalents, and other related technical fields that are within the spirit of the present application, and are made by using the contents of the specification and the drawings are included in the scope of the present application.
Claims (11)
1. An air jet loom weft detection circuit, characterized in that the air jet loom weft detection circuit comprises:
the weft detecting module is used for detecting weft yarns and outputting corresponding weft detecting signals;
the signal processing module is used for carrying out signal processing on the weft detection signal and outputting a corresponding direct current offset feedback signal, a weft detection feedback signal and a weft detection head feedback signal;
and the MCU is used for performing closed-loop feedback regulation on the direct-current bias voltage of the air jet loom according to the direct-current bias feedback signal, performing closed-loop feedback regulation on the weft detection sensitivity of the air jet loom according to the weft detection feedback signal, and performing closed-loop feedback regulation on the weft detection head state of the air jet loom according to the weft detection head feedback signal.
2. The weft detecting circuit of an air jet loom of claim 1, wherein the MCU unit is configured to obtain a first square wave number of pulse square waves within a preset phase range in the weft detecting feedback signal, and determine whether weft detection is successful according to the first square wave number.
3. The weft detecting circuit of the air jet loom according to claim 2, wherein the signal processing module comprises a signal amplifying unit, the MCU unit is configured to generate a sensitivity adjusting signal according to the first square wave number if weft detection is not successful, and perform closed-loop feedback adjustment on the signal amplification factor of the signal amplifying unit by outputting the sensitivity adjusting signal to the signal amplifying unit, so as to adjust the weft detecting sensitivity of the air jet loom;
if the weft detection is successful, acquiring a second square wave number of pulse square waves which are not in a preset phase range in the weft detection feedback signals, if the second square wave number is larger than a preset square wave number threshold value, generating sensitivity adjusting signals according to the second square wave number, outputting the sensitivity adjusting signals to the signal amplification unit, and carrying out closed-loop feedback adjustment on the signal amplification times of the signal amplification unit to adjust the weft detection sensitivity of the air jet loom.
4. The weft detecting circuit of an air jet loom of claim 1, wherein the signal processing module comprises a signal amplifying unit, and the MCU unit is further configured to generate a corresponding dc offset adjusting signal according to the dc offset feedback signal output by the signal amplifying unit, and output the dc offset adjusting signal to the signal amplifying unit, so as to perform closed-loop feedback adjustment on the dc offset voltage of the signal amplifying unit.
5. The weft detecting circuit of an air jet loom according to claim 1, characterized in that the weft detecting module comprises a weft detecting head and a first filter unit,
the weft feeler is used for acquiring weft feeler signals and outputting the weft feeler signals to the first filtering unit and the signal processing module;
the first filtering unit is used for filtering the weft detecting signal and outputting a corresponding weft detecting head feedback signal to the MCU unit;
the MCU unit is also used for carrying out closed-loop feedback regulation on the generated weft detection driving signal according to the weft detection head feedback signal so as to regulate the state of the weft detection head of the air jet loom, wherein the weft detection driving signal is used for driving the weft detection module to carry out weft detection.
6. The weft detecting circuit of an air-jet loom of claim 1, wherein the signal processing module comprises a second filtering unit, a signal amplifying unit and a hysteresis comparator,
the second filtering unit is used for carrying out filtering processing on the weft detection signal and outputting a corresponding filtering processing signal;
the signal amplification unit is used for amplifying the filtering processing signal and outputting a corresponding amplification signal to the hysteresis comparator, and the signal amplification unit is also used for outputting a direct current bias feedback signal corresponding to a direct current bias voltage used for amplification processing to the MCU unit;
and the hysteresis comparator is used for performing hysteresis comparison on the amplified signals and outputting corresponding weft detecting feedback signals.
7. A weft detecting method of an air jet loom is characterized by comprising the following steps:
weft yarn detection is carried out on an air-jet loom, and weft detecting signals are collected;
performing signal processing on the weft detection signal to obtain a direct current offset feedback signal, a weft detection feedback signal and a weft detection head feedback signal;
and performing closed-loop feedback regulation on the direct-current bias voltage of the air jet loom according to the direct-current bias feedback signal, performing closed-loop feedback regulation on the weft detection sensitivity of the air jet loom according to the weft detection feedback signal, and performing closed-loop feedback regulation on the weft detection head state of the air jet loom according to the weft detection head feedback signal.
8. The air-jet loom weft detection method according to claim 7, wherein the signal processing mode comprises signal amplification, and the closed-loop feedback adjustment of the weft detection sensitivity of the air-jet loom according to the weft detection feedback signal comprises:
acquiring the number of first square waves of pulse square waves in a preset phase range in the weft detecting feedback signals, and judging whether weft detecting is successful or not according to the number of the first square waves;
if the weft detection is not successful, performing closed-loop feedback regulation on the amplification times of the signals according to the sensitivity regulation signals generated by the first square wave number so as to regulate the weft detection sensitivity of the air jet loom;
if the weft detection is successful, acquiring the second square wave number of the pulse square waves which are not in the preset phase range in the weft detection feedback signals;
if the number of the second square waves is larger than a preset square wave number threshold value, generating a sensitivity adjusting signal according to the number of the second square waves;
and performing closed-loop feedback regulation on the times of signal amplification according to the sensitivity regulation signal so as to regulate the weft detecting sensitivity of the air jet loom.
9. The weft detecting method for the air jet loom according to claim 7, characterized in that the signal processing mode comprises signal amplification, and the closed-loop feedback regulation of the direct current bias voltage of the air jet loom according to the direct current bias feedback signal comprises the following steps:
acquiring a direct current bias feedback signal generated during signal amplification, and generating a corresponding direct current bias adjusting signal according to the direct current bias feedback signal;
and performing closed-loop feedback regulation on the direct current bias voltage during signal amplification according to the direct current bias regulation signal.
10. The weft detecting method of the air jet loom as claimed in claim 7, wherein the closed loop feedback regulation of the weft detecting head state of the air jet loom according to the weft detecting head feedback signal comprises:
adjusting the generated weft detection driving signal according to the weft detection head feedback signal, wherein the weft detection driving signal is used for driving a weft detection module of the air jet loom to detect weft;
and carrying out closed-loop feedback regulation on the weft feeler state of the air jet loom according to the regulated weft feeler driving signal.
11. An air jet loom weft feeler, characterized in that it comprises an air jet loom weft feeler circuit according to claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210850081.9A CN115216878B (en) | 2022-07-19 | Weft detection circuit, device and method of air jet loom |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210850081.9A CN115216878B (en) | 2022-07-19 | Weft detection circuit, device and method of air jet loom |
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| CN115216878A true CN115216878A (en) | 2022-10-21 |
| CN115216878B CN115216878B (en) | 2024-10-29 |
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