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CN-121978122-A - Carding machine web quality detection system

CN121978122ACN 121978122 ACN121978122 ACN 121978122ACN-121978122-A

Abstract

The application relates to a cotton web quality detection system of a carding machine, which comprises a medium plate, an air flow generating mechanism, an acousto-optic fusion detection module and a central control module, wherein the upper surface of the medium plate is a smooth convex arc surface, the air flow generating mechanism is used for generating high-speed coanda air flow along the tangential direction of the smooth convex arc surface, the acousto-optic fusion detection module comprises an optical imaging assembly arranged above the medium plate and an acoustic emission sensing array attached to a non-contact surface of the medium plate, the central control module is respectively connected with the optical imaging assembly and the acoustic emission sensing array and is configured to execute detection logic, the optical imaging assembly is used for acquiring cotton web images to identify visible defects, the acoustic emission sensing array is used for capturing stress wave signals generated by impact of hard impurities in the cotton web on the medium plate due to coanda air flow pressure, and the central control module is used for carrying out time-space alignment on image defect coordinates and stress wave source signal coordinates to generate a cotton web quality distribution map. The application generates high-speed coanda airflow through the variable-curvature dielectric plate, forcibly flattens the cotton web to eliminate high-speed shaking, and remarkably improves the detection precision.

Inventors

  • WANG YUNCHANG
  • YAN ZEWEN

Assignees

  • 潜江市昌云纺织有限公司

Dates

Publication Date
20260505
Application Date
20260306

Claims (9)

  1. 1. A carding machine web quality inspection system, comprising: The medium plate stretches across the lower part of the cotton net conveying path, and the upper surface of the medium plate is a smooth convex cambered surface and is made of a light-transmitting material; the air flow generating mechanism is positioned at the upstream end of the medium plate and is used for generating high-speed coanda air flow along the tangential direction of the smooth convex cambered surface so as to adsorb and flatten the cotton net on the air film layer above the medium plate to form a stable detection layer; the acousto-optic fusion detection module comprises an optical imaging assembly arranged above a dielectric plate, an acoustic emission sensing array attached to a non-contact surface of the dielectric plate, and And the central control module is respectively connected with the optical imaging assembly and the acoustic emission sensing array and is configured to execute detection logic for acquiring a cotton web image by the optical imaging assembly to identify visible defects, capturing stress wave signals generated by that hard impurities in the cotton web are impacted by the air pressure of the coanda air flow to the medium plate by the acoustic emission sensing array, and performing space-time alignment on image defect coordinates and stress wave source signal coordinates by the central control module to generate a cotton web quality distribution map.
  2. 2. A carding machine web quality detection system according to claim 1, further comprising: A pneumatic probe module comprising a plurality of micro pulse nozzles embedded in the medium plate, wherein the jet ports of the pulse nozzles penetrate through the upper surface of the medium plate and face the web abdomen; The central control module is further configured to control the pulse nozzles at corresponding coordinate positions to spray instantaneous air flow when the acousto-optic fusion detection module detects suspected impurities or nep signals at a certain coordinate point but the confidence coefficient of the signals is lower than a preset threshold value, and further control the optical imaging assembly to synchronously capture the change of the form of the cotton web of the area under disturbance, judge the cotton web to be fly or soft impurities if the form of the cotton web is loosely displaced, and judge the cotton web to be hard impurities or foreign matters if the form of the cotton web is rigidly displaced.
  3. 3. A carding machine web quality detection system according to claim 2, wherein a plurality of said pulse nozzles comprise a row of upstream-located pre-detection nozzles and a plurality of downstream-located rows of post-treatment nozzles, the pre-detection nozzles having an injection direction at an angle of 5 ° -15 ° to the normal direction of the web plane, the post-treatment nozzles having an injection direction at an acute angle to the web transport direction; The central control module is configured to control the front detection nozzle to work when the abnormal signal is detected, and control the rear treatment nozzle at the corresponding coordinate position to spray high-frequency continuous air flow when the abnormal signal is judged to be caused by hard impurity or foreign matter so as to physically break up fiber clusters wrapping the impurity.
  4. 4. A carding machine web quality detection system according to claim 2, further comprising: the laser displacement sensor is arranged above the dielectric plate and is arranged opposite to the pneumatic probe module; the central control module is further configured to randomly control the pulse nozzle to spray a quantitative standard air flow during a regular period when no abnormal signal is detected, and to measure the bulge height and rebound time of the web after the web is stimulated by using the laser displacement sensor so as to calculate the fiber cohesion index of the web.
  5. 5. The carding machine web quality detection system according to claim 1, wherein the cross-sectional profile of the smooth convex curved surface is an asymmetric arc with a decreasing radius of curvature along the web transport direction, and the radius of curvature of the upstream end is greater than the radius of curvature of the downstream end; The air flow generating mechanism is an air injection slot arranged at the upstream end of the medium plate, and the tangential included angle between the injection direction of the air injection slot and the upstream end wall surface of the smooth convex cambered surface is smaller than 15 degrees.
  6. 6. The carding machine web quality detection system of claim 1 wherein said optical imaging assembly includes a CMOS camera, a reflective light source and a transmissive light source, both directed toward the web and disposed above the media sheet; the central control module is further configured to: Controlling the transmission light source and the reflection light source to alternately strobe at intervals of milliseconds in a detection period, and controlling the CMOS camera to acquire one frame of image when each strobe occurs; carrying out pixel-level spatial registration on the continuous two frames of transmission images and the reflection images to generate transmission-reflection bimodal fusion images of the same cotton web area; And distinguishing the transparency defect and the physical foreign matter in the cotton web based on the ratio of the transmitted optical density to the reflected light intensity of the bimodal fusion image.
  7. 7. The cotton web quality detection system of a carding machine according to claim 1, wherein the acoustic emission sensing array comprises a plurality of piezoelectric ceramic sensors embedded in one side of the dielectric plate, which is far away from the smooth convex cambered surface, a damping sleeve with thin middle and thick edge is wrapped on the periphery of each piezoelectric ceramic sensor, and the edge of each damping sleeve is fixedly connected with the dielectric plate.
  8. 8. The carding machine web quality detection system of claim 7, wherein the surface of the dielectric plate is covered with a micro-textured wear-resistant coating, and the groove direction of the micro-textured wear-resistant coating forms an angle of 45 degrees with the web movement direction.
  9. 9. A carding machine web quality detection system according to claim 1, further comprising: the negative pressure suction port is arranged at the downstream end of the medium plate and is used for sucking and recovering high-speed coanda airflow so as to prevent the cotton web from secondary drifting after leaving the detection area due to wake turbulence.

Description

Carding machine web quality detection system Technical Field The application relates to the technical field of textile processing detection, in particular to a cotton web quality detection system of a carding machine. Background The carding machine acts as a "heart" in the spinning process, and the quality of the web produced directly determines the quality of the final yarn. With the development of the modern spinning technology to high speed and high yield, the sliver outlet speed of the carding machine is greatly improved, which brings unprecedented challenges to online quality detection of the cotton web. Existing web quality detection techniques rely primarily on machine vision (e.g., CCD/CMOS cameras) for non-contact scanning. However, in practice, since the web is extremely thin and moves at high speed (up to several hundred meters/minute), high-speed air turbulence is very likely to cause high-frequency vibration of the web during transport. Such vibration can cause frequent changes in camera focal length and motion blur in the image, making it difficult for the detection system to distinguish between the mesh (light transmission points) of the web itself and actual hole defects, resulting in false positives. In addition, the existing visual inspection can only acquire surface morphology information, and is not effective for hard impurities (such as fine wires, hard cotton seed chips, plastic sheets and the like) wrapped in the cotton web. Once the 'hidden impurities' enter the subsequent process, not only the spun yarn breaks, but also irreversible mechanical damage is caused to the rubber roller and card clothing of the expensive drawing frame. Accordingly, improvements are needed. Disclosure of Invention In order to solve the problems of jitter interference and difficult identification of hidden impurities in high-speed cotton web detection, the application provides a cotton web quality detection system of a carding machine. The application provides a cotton web quality detection system of a carding machine, which adopts the following technical scheme: A carding machine web quality inspection system comprising: The medium plate stretches across the lower part of the cotton net conveying path, and the upper surface of the medium plate is a smooth convex cambered surface and is made of a light-transmitting material; the air flow generating mechanism is positioned at the upstream end of the medium plate and is used for generating high-speed coanda air flow along the tangential direction of the smooth convex cambered surface so as to adsorb and flatten the cotton net on the air film layer above the medium plate to form a stable detection layer; the acousto-optic fusion detection module comprises an optical imaging assembly arranged above a dielectric plate, an acoustic emission sensing array attached to a non-contact surface of the dielectric plate, and And the central control module is respectively connected with the optical imaging assembly and the acoustic emission sensing array and is configured to execute detection logic for acquiring a cotton web image by the optical imaging assembly to identify visible defects, capturing stress wave signals generated by that hard impurities in the cotton web are impacted by the air pressure of the coanda air flow to the medium plate by the acoustic emission sensing array, and performing space-time alignment on image defect coordinates and stress wave source signal coordinates by the central control module to generate a cotton web quality distribution map. Still further, the method further comprises: A pneumatic probe module comprising a plurality of micro pulse nozzles embedded in the medium plate, wherein the jet ports of the pulse nozzles penetrate through the upper surface of the medium plate and face the web abdomen; The central control module is further configured to control the pulse nozzles at corresponding coordinate positions to spray instantaneous air flow when the acousto-optic fusion detection module detects suspected impurities or nep signals at a certain coordinate point but the confidence coefficient of the signals is lower than a preset threshold value, and further control the optical imaging assembly to synchronously capture the change of the form of the cotton web of the area under disturbance, judge the cotton web to be fly or soft impurities if the form of the cotton web is loosely displaced, and judge the cotton web to be hard impurities or foreign matters if the form of the cotton web is rigidly displaced. Further, the pulse nozzles comprise a row of front detection nozzles positioned at the upstream and a plurality of rows of rear treatment nozzles positioned at the downstream, the included angle between the spraying direction of the front detection nozzles and the normal direction of the web plane is 5-15 degrees, and the included angle between the spraying direction of the rear treatment nozzles and the web conveying direction is an ac