CN202989448U

CN202989448U - Broken yarn detection device based on video signal processing

Info

Publication number: CN202989448U
Application number: CN 201220493426
Authority: CN
Inventors: 王玉凤; 范必双
Original assignee: Changsha University of Science and Technology
Current assignee: Changsha University of Science and Technology
Priority date: 2012-09-26
Filing date: 2012-09-26
Publication date: 2013-06-12
Anticipated expiration: 2022-09-26

Abstract

The utility model belongs to the field of signal detection and processing in the textile industry, and relates to a broken yarn detection device based on video signal processing. The device can overcome defects of a traditional broken yarn detection device, face detection replaces point detection, and accordingly broken yarn detection is precise and reliable. The device comprises a high-speed camera, a high-speed analog-to-digital (A/D) converter, a field programmable gate array (FPGA), an active radio frequency identification device (RFID) and a handheld terminal. A yarn cloth picture is captured through the high-speed camera, sampling and A/D conversion are carried out on picture simulation signals through the high-speed A/D converter, quick analysis and processing are carried out on picture data through an FPGA technique, according to processing results, the signals are output to control a machine to stop working, and meanwhile radio alarm signals are sent out to the handheld terminal through the active RFID.

Description

A kind of Yarn break checkout gear of processing based on vision signal

Technical field

This patent relates to a kind of Yarn break checkout gear of processing based on vision signal.

Background technology

Textile industry is occupied very important status in the national economy of China, as traditional labor-intensive production, irreplaceable pillar effect has been brought into play in the Chinese development of the national economy.Show according to a internal file of china textile industrial combination meeting, 2012, the textile industry total employment of China is increased to 2,000 ten thousand person-times of left and right from more than 1,300 ten thousand person-times in 2000, and the enterprise of annual sales revenue more than 2,000 ten thousand yuan reached 3.67 ten thousand families.Alarming is that the huge industry of this employment volume meets with an interim difficult problem.Falling sharply and meagre profit margin of volume of trade makes some enterprises face huge survival pressure.Therefore, how to enhance productivity, economizing on resources becomes the most important thing of textile industry Business survival and development with personnel cost.

In process of textile production, a ubiquitous large problem is, because the waste that broken needle or hook yarn cause is very serious.And general solution is the person of sending someone guarding now, and whether every loom of regular continual inspection exists the situation of broken yarn, and one is found, and manual shut-down, keep in repair at once.This not only exists personnel to have high input, workload is large, efficient is low, and can not cause large quantities of weaving cotton cloth to scrap because in time pinpoint the problems.

Now on the market broken pin test device or broken yarn detector used mostly be photo-electric type, hall sensing formula, laser type.This class detector only detects for a point due to general, therefore, easily is subject to textile mills' bad working environments and causes flase drop as the impact of vibration, dust etc.

Summary of the invention

The broken yarn monitor that this patent will solve traditional employing photo-electric type, hall sensing formula, laser type sensor is subject to environment and industrial and mineral impact and interference and causes detecting inaccurate problem, designs the Yarn break checkout gear based on the vision signal processing that a antijamming capability is strong, area of detection is large.This Yarn break checkout gear is made of high-speed camera head, high-speed a/d converter, FPGA, active RFID and handheld terminal; catch the gauze picture by the high-speed camera head; carry out sampling and the analog-to-digital conversion of image analoging signal with high-speed a/d converter; utilize FPGA (Field Programmable Logic Devices) technology that view data is analyzed fast and processed; and control machine down according to the result output signal, send alarm signal to handheld terminal simultaneously.The analysis of picture signal and processing realize by FPGA hardware, communicate by the active RFID radio between handheld terminal and Ge Tai broken yarn detector.This device can make up the deficiency of traditional Yarn break checkout gear, for point, makes broken yarn detect more accurate and reliable with face.

Description of drawings

Fig. 1 is based on the block diagram of system of the Yarn break checkout gear of vision signal processing.Device is made of high-speed camera head, high-speed a/d converter, FPGA, active RFID and handheld terminal, the analysis of picture signal and processing realize by FPGA hardware, communicate by active RFID (Radio Frequency Identification) radio between handheld terminal and Ge Tai broken yarn detector.At first the gauze image gathers by the high-speed camera head; the analog signal of its output is carried out analog-to-digital conversion through high-speed a/d converter and is become image digital signal; then FPGA carries out the high-speed parallel processing to image digital signal; result exists the broken yarn phenomenon to export stopping signal and controls shutdown to the weaving loom controller; output alarm signal is transmitted into handheld terminal via the active RFID radio-circuit simultaneously, and handheld terminal can show the identification number that broken yarn occurs.

The specific embodiment

Gauze that weaving loom is knitted is generally pure color (as white), if there is no broken yarn, entire image gray value by camera collection is consistent, in case broken yarn (be generally vertical direction broken single line) occurs, as shown in " gauze that broken yarn is arranged " part in accompanying drawing 1, the gradation of image value that a certain y direction can occur is abnormal.This principle that just is based on this patent realizes that broken yarn detects.

Because the broken yarn detection is very high to requirement of real-time, also can rotate during loom work, thus must adopt the high-speed camera head to carry out IMAQ, otherwise easily cause ghost image, cause flase drop.And for not undetected, system must possess data-handling capacity at a high speed, therefore, as shown in Figure 1, after picture signal is made a video recording through the high-speed camera head, become analog signal output, and the high-speed a/d converter of rear class is sampled and analog-to-digital conversion and output image data signal to image analoging signal, then send into the FPGA that the speed of service is fast, parallel processing capability is strong and directly image information is processed.Because FPGA directly realizes processing to signal with hardware circuit, have fast operation, characteristics that concurrency is high, comparing the processors such as the single-chip microcomputer realized with software and DSP has incomparable advantage, and what can improve greatly that signal processes is real-time.Adopt the mode of shooting due to this patent, detection be a face, therefore can greatly reduce the probability of flase drop.For the broken yarn picture signal that occurs; can set a threshold value; when the gray value extraordinary image vegetarian refreshments number that surpasses this threshold value; and extraordinary image vegetarian refreshments ordinate very near the time; can judge has broken yarn to produce; send stopping signal for immediately the weaving loom controller, launch alarm signal to hand-held terminal by active RFID simultaneously.Compare traditional point and detect, the advantage that face detects is, is not easy to be subject to the impact of environment and operating mode, can be according to the field condition setting threshold, and have certain intelligent characteristics aspect the signal processing.

In addition, for the input that reduces personnel and the burden that alleviates the workman, and make the Yarn break checkout gear of this patent have more intellectuality and practical, the broken yarn detection signals of many are gathered by a handheld terminal.Adopt radio communication between handheld terminal and each broken yarn detector, avoided on the one hand the difficulty of wiring, make on the other hand personnel operation more flexible, handheld terminal can be carried, and need not to be fixed on a place.

Claims

1. A kind of Yarn break checkout gear of processing based on vision signal, it is characterized in that device is made of high-speed camera head, high-speed a/d converter, FPGA, active RFID and handheld terminal, the analysis of picture signal and processing realize by FPGA hardware, communicate by the active RFID radio between handheld terminal and Ge Tai broken yarn detector.