CN-121994804-A - Device and method for double-sided visual detection of surface defects of cloth towel

CN121994804ACN 121994804 ACN121994804 ACN 121994804ACN-121994804-A

Abstract

The invention discloses equipment and a method for double-sided visual detection of cloth surface defects, wherein the equipment comprises a conveying mechanism, a trigger switch, a line scanning camera, a polishing light source and a PLC (programmable logic controller) control system, wherein the conveying mechanism comprises a transparent supporting plate for carrying cloth to be detected, the cloth to be detected is conveyed along a preset direction, signals are transmitted to the PLC control system when the transparent supporting plate passes through the trigger switch, four line scanning cameras are triggered to shoot front and back images of the cloth when the cloth passes through a first area and a second area according to preset time sequence configuration information, and the obtained detection images are compared with pre-stored cloth flaw images in the system in similarity, so that whether the cloth to be detected is qualified is judged. The invention synchronously detects whether the front and back sides of the cloth towel are qualified or not frame by frame, the towel is not required to be turned over, the detection efficiency is doubled, meanwhile, the flaws on the surface and the inside of the cloth towel can be detected, and the detection function is improved.

Inventors

XU DAOMING
ZHANG QI
LIU QUN
CHEN JIANCHAO

Assignees

江苏中馨纺织智能设备有限公司

Dates

Publication Date: 20260508
Application Date: 20260313

Claims (7)

1. An apparatus for double-sided visual inspection of a drape surface defect, comprising: the conveying mechanism comprises a transparent supporting plate (11) for carrying cloth towel to be detected and conveying the cloth towel along a preset direction; The trigger switch is arranged on a frame through which the transparent supporting plate passes and is used for transmitting the information of the transparent supporting plate carrying the towel to be detected to the PLC control system (5); The four line scanning cameras are arranged on an upper frame and a lower frame which are sequentially passed by the transparent supporting plate, the lenses face the transparent supporting plate vertically, the first line scanning camera (31) and the third line scanning camera (33) are arranged on the upper frame front and back, the second line scanning camera (32) and the fourth line scanning camera (34) are arranged on the lower frame front and back, the first line scanning camera (31) and the second line scanning camera (32) are used for shooting front and back images when a cloth towel to be detected passes through the first area (13), and the third line scanning camera and the fourth line scanning camera are used for shooting front and back images when the cloth towel to be detected passes through the second area (14); The polishing light source comprises an upper light source (41) and a lower light source (42), and is respectively arranged on an upper rack and a lower rack of the transparent supporting plate (11) which pass through the first area (13) and the second area (14) in sequence in a staggered manner; And the PLC control system (5) is in signal connection with a trigger switch, a line scanning camera and a driving servo motor of the conveying mechanism and is used for controlling the start and stop of the servo motor and the speed of time, receiving a trigger switch signal, generating a line scanning camera shooting trigger signal according to preset time sequence configuration information, and comparing the shot detection image with a cloth defect image pre-stored in the system in a similarity manner to judge whether the cloth to be detected is a qualified product or a unqualified product.
2. The device for double-sided visual inspection of cloth towel surface defects according to claim 1, wherein the conveying mechanism comprises a transparent supporting plate (11) and a towel feeding linear module (12), wherein guide rails of the towel feeding linear module are arranged in parallel at intervals on two sides, and two sides of the transparent supporting plate are arranged on sliding blocks of the towel feeding linear module and reciprocate through the towel feeding linear module.
3. The device for double-sided visual detection of surface defects of cloth according to claim 1, wherein the trigger switch comprises a mirror surface reverse type photoelectric sensor (21) and a reflecting plate (22), and the mirror surface reverse type photoelectric sensor and the reflecting plate are respectively arranged at corresponding positions on an upper frame and a lower frame through which the transparent supporting plate (11) passes.
4. An apparatus for double-sided visual inspection of towel surface defects according to claim 1, characterized in that the transparent pallet (11) is a transparent glass plate.
5. A method for double-sided visual inspection of surface defects of a towel, comprising the steps of: the transparent supporting plate carrying the cloth towel to be detected is conveyed along a preset direction by the control conveying mechanism; The transparent supporting plate for carrying the cloth towel to be detected is transmitted to the PLC control system through the trigger switch; According to preset time sequence configuration information, controlling a first line scanning camera and a second line scanning camera to shoot a front face positive light source detection image and a back face negative light source detection image when a cloth to be detected passes through a first area, and controlling a third line scanning camera and a fourth line scanning camera to shoot a front face negative light source detection image and a back face positive light source detection image when the cloth to be detected passes through a second area; And the detection image is transmitted back to the PLC control system and is compared with a pre-stored cloth towel flaw image in the system in similarity, and the cloth towel to be detected is judged to be a qualified product or a unqualified product.
6. The method for double-sided visual inspection of a surface defect of a cloth cover according to claim 5, wherein each generated inspection image is stored in a PLC control system to be a flaw image if the inspection image is compared with the flaw image to reach a predesigned similarity.
7. The method for double-sided visual inspection of cloth towel surface defects according to claim 5, wherein the front side light source detection image and the back side front side light source detection image are used for detecting cloth towel surface thread ends, surface thread skipping and surface dirt type unqualified quality problems, and the front side backlight source detection image and the back side backlight source detection image are used for detecting cloth towel inner weaving loophole type unqualified quality problems.

Description

Device and method for double-sided visual detection of surface defects of cloth towel Technical Field The invention relates to the field of cloth towel after-finishing production, in particular to equipment and a method for double-sided visual detection of surface defects of cloth towels. Background The towel finishing production process includes the steps of firstly, carrying out longitudinal edge sewing on the strip towel cloth on a longitudinal sewing machine, then, carrying out transverse edge sewing on the strip towel cloth by cutting pieces through a transverse sewing machine, and then, detecting whether a product is qualified or not on two sides, and sorting and packaging. The manual double-sided turning detection has the advantages of large labor investment, low working efficiency and possible false detection. The applicant developed a generation of 'cloth towel visual inspection conveying line' which has obtained patent authorization (authorization bulletin number: CN 223426544U), and the front side photographic inspection is carried out on the cloth towels which are sewn in pieces in the conveying process, and then the back side photographic inspection is carried out after the cloth towels are turned over. The equipment not only sets up detection mechanism but also sets up the piece of cloth mechanism that turns over, and the production line is long, turns over face by face and detects in proper order, and detection efficiency remains to promote, can only detect cloth surface flaw simultaneously, and inside weaving leak is unoccupied to be detected. Disclosure of Invention Aiming at the problems in the prior art, the invention provides equipment and a method for double-sided visual detection of surface defects of cloth towels, which are used for synchronously detecting the front and the back of the cloth towels conveyed by a transparent supporting plate, have high efficiency, and can detect the unqualified quality problems of thread ends, surface jump wires and surface stains on the surfaces of the cloth towels by front light source detection and back front light source detection and can detect the unqualified quality problems of loopholes woven in the inside of the cloth towels by back light source detection. In order to achieve the above purpose, the present invention provides the following technical solutions: an apparatus for double-sided visual inspection of a drape surface defect, comprising: The conveying mechanism comprises a transparent supporting plate for carrying the cloth towel to be detected and conveying the cloth towel along a preset direction; The trigger switch is arranged on the frame through which the transparent supporting plate passes and is used for transmitting the information of the transparent supporting plate carrying the cloth towel to be detected to the PLC control system; The four line scanning cameras are arranged on an upper frame and a lower frame which are sequentially passed by the transparent supporting plate, the lenses face the transparent supporting plate vertically, the first line scanning camera and the third line scanning camera are arranged on the upper frame front and back, the second line scanning camera and the fourth line scanning camera are arranged on the lower frame front and back, the first line scanning camera and the second line scanning camera are used for shooting front and back images of a cloth to be detected when the cloth passes through a first area, and the third line scanning camera and the fourth line scanning camera are used for shooting front and back images of the cloth to be detected when the cloth passes through a second area; The polishing light source comprises an upper light source and a lower light source which are respectively arranged on an upper rack and a lower rack of the transparent supporting plate, which pass through the first area and the second area in sequence; And the PLC control system is in signal connection with a trigger switch, a line scanning camera and a driving servo motor of the conveying mechanism and is used for controlling the start and stop of the servo motor and the time speed, receiving the trigger switch signal, generating a line scanning camera shooting trigger signal according to preset time sequence configuration information, and comparing the shot detection image with a cloth defect image prestored in the system in a similarity manner to judge whether the cloth to be detected is a qualified product or a unqualified product. The further improvement scheme is, transport mechanism includes transparent layer board and send piece of cloth straight line module, and the guide rail that send piece of cloth straight line module divides both sides interval parallel arrangement, and transparent layer board both sides are installed on the slider that send piece of cloth straight line module, through sending piece of cloth straight line module reciprocating motion. The trigger switch comprises a mirror surfac