CN105129370B

CN105129370B - A kind of ribbon conveyer longitudinal tear detection method

Info

Publication number: CN105129370B
Application number: CN201510477066.4A
Authority: CN
Inventors: 付胜; 刘毅; 陈涛; 刘坤
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2015-08-06
Filing date: 2015-08-06
Publication date: 2017-07-14
Anticipated expiration: 2035-08-06
Also published as: CN105129370A

Abstract

A kind of ribbon conveyer longitudinal tear detection method, is equipped with CCD camera and line laser transmitter in the detection means above ribbon conveyer, and ribbon conveyer is loaded with bulk material, and material is evenly distributed on belt.Line laser transmitter forms an angle with the ribbon conveyer direction of motion, and the line laser of transmitting is vertical with the ribbon conveyer direction of motion.Line laser is incident upon on material, and the shape of material plays a part of modulation, the line laser curve after CCD camera collection modulation to line laser, and reaches processor progress image procossing.When ribbon conveyer is without tear failure, the line laser curve collected is a smoothed curve.When tear failure occurs for ribbon conveyer, larger fluctuation occurs for the line laser curve collected, judges that longitudinal tear occurs for ribbon conveyer after image procossing.This method is simple, reliability, treatment effeciency are high, can accurately judge the longitudinal tear failure occurred in ribbon conveyer running.

Description

A kind of ribbon conveyer longitudinal tear detection method

Technical field

The present invention relates to a kind of ribbon conveyer longitudinal tear detection method, belong to ribbon conveyer state inspection neck Domain.It is particularly suitable for use in and transports the ribbon conveyer longitudinal tear fault detect of bulk material.

Background technology

Ribbon conveyer is the capital equipment of penumatic capsule pipeline system, and it is widely used in harbour, chemical industry, mine, grain-production Deng industrial circle.Belt tearing accident happens occasionally, and is worth hundreds thousand of members even belt conveyor of members up to a million, once tear Accident is split, will all be damaged within a few minutes, huge economic loss and security incident is caused.With belt conveyor application Scope it is more and more wider, its usage amount is increasing, and the accident torn is also more and more.Therefore, belt is carried out longitudinally to tear Splitting the research of detection method has very big practical significance.In order to solve this problem, domestic and foreign scholars have been attempted many methods and used In the detection of ribbon conveyer longitudinal tear failure, such as embedding inlay technique, ultrasonic technology probe method, photoelectric sense technology method, X-ray are visited Hinder method etc..Due to the excessively complicated higher less stable of cost of above-mentioned detection method detection means or False drop rate is higher, is all limited in actual applications, it is impossible to obtain expected Detection results.

The content of the invention

The present invention is directed to the problem of being previously mentioned in background technology, it is proposed that a kind of ribbon conveyer longitudinal tear detection side Method, this method can accurately and efficiently judge the longitudinal tear that ribbon conveyer occurs.

The concrete scheme of the present invention is as follows：Detection track (1), pulley (2) and inspection are installed above ribbon conveyer (6) Survey track (1) to be in contact, detection means is driven by a pair of pulleys (2), and detection means is in ribbon conveyer (6) head to tail Between move.CCD camera (3) is fixed in the fixed plate of detection means (4) with line laser transmitter (5), CCD camera (3) thing Face is parallel with ribbon conveyer (6) surface, and line laser transmitter (5) and CCD camera (3) are on same vertical plane, line laser Transmitter (5) can rotate at a certain angle in vertical plane, it is preferred that the direction of line laser transmitter and the folder of horizontal direction Angle is 15-45 °.The a wordline laser of line laser transmitter (5) transmitting is incident upon material (7) surface, a wordline laser and belt Conveyer (7) direction of motion is vertical, and the shape of material (7) plays a part of modulation to line laser, the shape of a wordline laser with The change of material (7) shape and change, CCD camera (3) gathers the line laser curve after modulation, and reach processor and schemed As processing.When material (7) surface line Laser Curve is smooth, then illustrates that ribbon conveyer (6) surface material shape is gentle, judge band Material leakage, i.e. ribbon conveyer (7) do not occur and occurs without longitudinal tear failure for formula conveyer (6) surface material (7).When material (7) Larger fluctuation occurs for surface line Laser Curve, then illustrates that ribbon conveyer (6) surface material shape is mutated, judge ribbon conveyer (6) material leakage, i.e. ribbon conveyer (7), which occur, for surface material (7) longitudinal tear failure.

The image that processing CCD camera is collected comprises the following steps：

(1) read image RGB tri- to be worth, be that R values set a fixed threshold, the RGB that R values in image are less than threshold value is all put In 0, the RGB more than threshold value is all placed in 255, and the extraction to a line laser and binaryzation are completed with this；

(2) it is single pixel curve by image thinning, the optimal approximation Equation f (x) for drawing curve is fitted to curve；

(3) pairing approximation Equation f (x) derivation, obtains the number and coordinate of extreme point；

(4) criterion of longitudinal tear occurs using the number of the extreme point of step (3) as ribbon conveyer, works as only one of which During extreme point, line laser curve is judged for smooth curve, material leakage does not occur for material, ribbon conveyer is sent out without longitudinal tear failure It is raw；When extreme point number is more than 1, judge that line laser curve is undergone mutation, material leakage occurs for material, ribbon conveyer occurs vertical To tear failure.

Brief description of the drawings

Fig. 1 is the detecting system block diagram of ribbon conveyer longitudinal tear.

Fig. 2 (a) is the ribbon conveyer surface material figure with line laser.

Fig. 2 (b) is the line laser figure after extracting.

Fig. 2 (c) is the line laser figure after refinement.

Fig. 2 (d) swashs curve map for the line after over-fitting.

Fig. 3 (a) is the ribbon conveyer surface material figure with line laser.

Fig. 3 (b) is the line laser figure after extracting.

Fig. 3 (c) is the line laser figure after refinement.

Fig. 3 (d) swashs curve map for the line after over-fitting.

In figure：1st, track is detected, 2, pulley, 3, CCD camera, 4, fixed plate, 5, line laser transmitter, 6, belt conveying Machine, 7, material.

Embodiment

The invention will be further described below in conjunction with the accompanying drawings：

Shown in Fig. 1, specific work process is：Detect that track can use structure of steel wire, detection track is complete along ribbon conveyer Line is laid, and is 80cm with ribbon conveyer upper surface distance, and inspection device is arranged on detection track, is driven using a pair of pulleys Motion detection device is run, and detection means is from head setting in motion, and direction is identical with the ribbon conveyer direction of motion, and speed is 0.8m/s.The a wordline laser whole process scanning ribbon conveyer surface of material of transmitting, CCD camera is taken pictures once every 0.03ms, And image is reached into processor via image pick-up card, processor is handled image by fault diagnosis algorithm, and judgement is No to have longitudinal tear failure, diagnostic result can be sent to remote monitoring center by such as breaking down, and be controlled by Surveillance center Ribbon conveyer jerk processed.When detection means moves to tail, can automatic reverse, with the ribbon conveyer direction of motion on the contrary, Move, using low-speed motion pattern, speed is 0.3m/s, and so on completed to ribbon conveyer whole piece belt to Handpiece Location Fault detect task.

CCD camera acquires the image of the ribbon conveyer surface material with line laser, shown in such as Fig. 2 (a), due to adopting It is the red a wordline lasers of 650nm, so need to only extract red, you can by line laser curve extracting completely.Read The rgb value for collecting image is taken, all values are put into matrix in sequence, R threshold value is set as 220, will be less than in matrix The whole zero setting of 220 rgb value, the rgb value more than 220 is all placed in 255, obtains a new matrix after treatment, will This matrix is shown as image and obtains Fig. 2 (b), so as to be extracted line laser curve and curve has been carried out into binaryzation.In order to The curve of single pixel composition is obtained, curve is refined, such as Fig. 2 (c).Curve after refinement is subjected to trigonometric function plan Close, obtained fitting function for f (x), matched curve such as Fig. 2 (d).OrderExtreme value of a function point number is obtained for 1, by This judges matched curve for smooth curve, i.e., the line laser curve of ribbon conveyer surface of material is smooth curve, it is known that belt Material leakage does not occur gently for conveyor surface material shapes, finally can determine whether that longitudinal tear failure does not occur for ribbon conveyer.

CCD camera acquires the image of the ribbon conveyer surface material with line laser, shown in such as Fig. 3 (a), due to adopting It is the red a wordline lasers of 650nm, so need to only extract red, you can by line laser curve extracting completely.Read The rgb value for collecting image is taken, all values are put into matrix in sequence, R threshold value is set as 220, will be less than in matrix The whole zero setting of 220 rgb value, the rgb value more than 220 is all placed in 255, obtains a new matrix after treatment, will This matrix is shown as image and obtains Fig. 3 (b), so as to be extracted line laser curve and curve has been carried out into binaryzation.In order to The curve of single pixel composition is obtained, curve is refined, such as Fig. 3 (c).Curve after refinement is subjected to trigonometric function plan Close, obtained fitting function for f (x), matched curve such as Fig. 3 (d).OrderExtreme value of a function point number is obtained for 3, by This judges that the line laser curve that crest and trough, i.e. ribbon conveyer surface of material occurs in matched curve is mutated, it is known that There is raised and depression in ribbon conveyer surface material shape, and material leakage occurs for surface material, finally can determine whether that ribbon conveyer is sent out Raw longitudinal tear failure.

Claims

1. a kind of ribbon conveyer longitudinal tear detection method, it is characterised in that：Detection is installed above ribbon conveyer (6) Track (1), pulley (2) is in contact with detection track (1), and detection means is driven by a pair of pulleys (2), and detection means is in belt Conveyer (6) head is moved between tail；CCD camera (3) is fixed on the fixed plate of detection means with line laser transmitter (5) (4) on, CCD camera (3) object plane is parallel with ribbon conveyer (6) surface, and line laser transmitter (5) is with CCD camera (3) same On vertical plane, line laser transmitter (5) rotates at a certain angle in vertical plane, the direction of line laser transmitter and level There is 15-45 ° of angle in direction；The a wordline laser of line laser transmitter (5) transmitting is incident upon material (7) surface, a wordline Laser is vertical with ribbon conveyer (7) direction of motion, and the shape of material (7) plays a part of modulation to line laser, and a wordline swashs The shape of light changes with the change of material (7) shape, the line laser curve after CCD camera (3) collection modulation, and reaches place Manage device and carry out image procossing；When material (7) surface line Laser Curve is smooth, then illustrate ribbon conveyer (6) surface material shape Gently, judge that material leakage, i.e. ribbon conveyer (7) do not occur and is sent out without longitudinal tear failure for ribbon conveyer (6) surface material (7) It is raw；When larger fluctuation occurs for material (7) surface line Laser Curve, then illustrate that ribbon conveyer (6) surface material shape is mutated, sentence Material leakage, i.e. ribbon conveyer (7), which occur, for disconnected ribbon conveyer (6) surface material (7) longitudinal tear failure.

2. a kind of ribbon conveyer longitudinal tear detection method according to claim 1, it is characterised in that processing CCD phases The image that machine is collected comprises the following steps：

(1) read image RGB tri- to be worth, be that R values set a fixed threshold, the RGB that R values in image are less than threshold value is all placed in 0, RGB more than threshold value is all placed in 255, and the extraction to a line laser and binaryzation are completed with this；

(4) criterion of longitudinal tear occurs using the number of extreme point as ribbon conveyer, when only 1 extreme point, judges Line laser curve is smooth curve, and material leakage does not occur for material, and ribbon conveyer occurs without longitudinal tear failure；When extreme point number During more than 1, judge that line laser curve is undergone mutation, material leakage occurs for material, longitudinal tear failure occurs for ribbon conveyer.