CN104063716A - Method for detecting breaking strand or wire of wire rope - Google Patents
Method for detecting breaking strand or wire of wire rope Download PDFInfo
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- CN104063716A CN104063716A CN201410308323.7A CN201410308323A CN104063716A CN 104063716 A CN104063716 A CN 104063716A CN 201410308323 A CN201410308323 A CN 201410308323A CN 104063716 A CN104063716 A CN 104063716A
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Abstract
The invention relates to a method for detecting a breaking strand or wire of a wire rope used for lifting machinery, mine machinery and elevator industry, in particular to a method for detecting a breaking strand or wire of an elevator traction wire rope. The method comprises the following steps: a guiding apparatus is installed in a working path of traction wire ropes, so that there is a fixed gap between adjacent traction wire ropes when the traction wire ropes pass the guiding apparatus; a digital camera is used to take pictures of the traction wire ropes with the fixed gap at fixed times and to save the pictures; the pictures are subjected to gray scale processing to obtain gray scale image matrices; the numbers of pixel grids of the gray scale image matrices of the pictures taken at fixed times are compared with a grid number critical value; and when the numbers of the pixel grids are greater than the grid number critical value for no less than 5000 times, an alarm is given. The invention aims to provide a novel elevator traction wire rope detection method different from conventional electromagnetic detection methods.
Description
Technical field
The present invention relates to the detection method of the application wire rope such as hoisting machinery, mining machinery, elevator industry, be specifically related to a kind of broken strand of steel cable, the method for detecting broken wire of elevator dragging wire rope.
Background technology
Wire rope is widely used in every field, it have intensity high, flexible good, from heavy and light, the advantage such as operate steadily.But in the long-term use of wire rope, unavoidably to produce distortion, constantly wearing and tearing.Under normal elastic deformation, wire rope also can normally be used; When wire rope overload, the permanent plastic deformation of the generation such as use or extraneous factor destruction for a long time, just there will be the situation of steel rope fault, disconnected thigh, cause its strength decreased; If no more than time process, just there will be the whole fracture of wire rope, thereby cause the risk of the generation of great serious accident.Therefore, detect in time the situation of steel rope fault, disconnected thigh, change ahead of time the traction steel-cable of badly broken, very important to safety in utilization.
Summary of the invention
The object of the present invention is to provide a kind of new elevator dragging wire rope detection method that can be different from traditional electromechanical detection method.
The present invention is achieved by the following technical solutions: a kind of broken strand of steel cable, method for detecting broken wire, wherein, comprise the following steps,
A, on the operating path of traction steel-cable installation and guide device, make traction steel-cable when the guide piece, between adjacent traction steel-cable, have fixing gap,
B, use digital camera take pictures and store photograph there being the traction steel-cable of fixed interval (FI) to carry out timing,
C, photograph is carried out to gray scale processing, obtains a gray level image matrix,
D, at definite traction steel-cable, take standard traction steel-cable without fracture of wire, without disconnected burst in the situation that, the traction steel-cable digital photo computer of standard obtains gray level image matrix after treatment, according to the gray-scale value that has wire rope position location of pixels, obtain a gray scale critical value
Gray-scale value and the comparison of gray scale critical value of E, each pixel of use gray level image matrix, total pixel quantity that the gray-scale value of pixel is greater than gray scale critical value is pixel grid number,
F, the pixel grid number that obtains gray level image matrix of taking in the situation that determining traction steel-cable without fracture of wire, without disconnected burst are grid number critical value,
H, by the pixel grid number of the gray level image matrix of the elevator dragging wire rope photograph of BR and the comparison of grid number critical value, the number of times that is greater than grid critical value when pixel grid number is greater than or equal to alarm 5000 times,
G, at definite traction steel-cable without fracture of wire, in the situation of disconnected steel cable, take standard traction steel-cable, the pixel grid number that image obtains after processing is disconnected value of stocks, by the pixel grid number of the elevator dragging wire rope photograph of BR and disconnected value of stocks comparison, when being less than disconnected value of stocks, pixel grid number reports to the police at once.
The invention has the beneficial effects as follows:
Existing pick-up unit is mainly to be ruptured by jogging switches measurement or specific unit protection; the former can not solve wire rope vibration and cause the inaccurate problem that detects; the wire cable ruptures such as the latter carry out processing reaction again and lag behind very much; applicable scope is too narrow; can not effectively adapt to the protection of commercial unit actual motion, just the situation of fracture of wire can not detection alarm.The present invention is incorporated into image processing techniques in traction steel wire fracture situation pick-up unit, can detect effectively and timely wire rope and destroy situation, instructs in advance more change steel rope, takes precautions against in possible trouble.
Keep the spacing of adjacent wires rope in traction steel-cable, while making to detect, get rid of situation overlapped in traction steel-cable image, between traction steel-cable, will leave certain space simultaneously, for traction steel-cable fracture of wire detection is below prepared.
In the process of elevator operation, traction steel-cable moves up and down, and BR can be taken pictures to whole piece traction steel-cable, and grid number is the digitizing of the shared area of traction steel-cable in the image of standard traction steel-cable.The photograph that it is convenient and to be detected that the traction steel-cable of standard carries out digitizing is compared.No matter whether traction steel-cable vibrates in the process of traction, in the image of unit traction steel-cable after shooting, shared area is constant, and grid critical value is the area that standard traction steel-cable should account for.What pixel grid number was greater than that grid critical value represents in actual conditions is the phenomenon of fracture of wire, because the photograph that ccd camera is taken be all plane and elevator dragging wire rope is three-dimensional, steel wire has broken afterwards because the effect meeting of tension force is opened to surrounding, and main body wire rope can't be vacated one in image, after wire rope opens on the contrary, image can have more the area of that a part of steel wire breaking, the situation of elevator dragging wire rope sub-fraction fracture of wire can allow simultaneously, after only having small damage accumulation to a certain extent, in all comparisons, pixel grid number is greater than grid critical value 5000 times when above, just need elevator stop transport and overhaul.Fracture of wire can cause pixel grid number bigger than normal, but disconnected stock market-circumstance condition is different, owing to being disconnected thigh, the strand steel wire rope disconnecting there will not be in image, and pixel grid number can, much smaller than grid number critical value, approach disconnected value of stocks, will report to the police immediately this time, stops elevator operation.
Embodiment
Broken strand of steel cable, a method for detecting broken wire, wherein, A, on the operating path of traction steel-cable installation and guide device, make traction steel-cable when the guide piece, between adjacent traction steel-cable, have fixing gap; During detection, need to get rid of situation overlapped in traction steel-cable image, between traction steel-cable, will leave certain space simultaneously, for traction steel-cable fracture of wire detection is below prepared.
B, use ccd camera are taken the photograph a sheet photo storage to traction steel-cable 3 to 4 second beats; In the process of elevator operation, traction steel-cable moves up and down, and shooting regularly indirectly can take pictures to whole piece traction steel-cable,
C, photograph is carried out to gray scale processing, obtain a gray level image matrix, by photo digitizing
D, at definite traction steel-cable, take standard traction steel-cable without fracture of wire, without disconnected burst in the situation that, the traction steel-cable digital photo computer of standard obtains gray level image matrix after treatment, according to the gray-scale value that has wire rope position location of pixels, obtain a gray scale critical value; The photograph that it is convenient and to be detected that the traction steel-cable of standard carries out digitizing is compared.
Gray-scale value and the comparison of gray scale critical value of E, each pixel of use gray level image matrix, total pixel quantity that the gray-scale value of pixel is greater than gray scale critical value is pixel grid number; Grid number is the digitizing of the shared area of traction steel-cable in the image of standard traction steel-cable.
F, the pixel grid number that obtains gray level image matrix of taking in the situation that determining traction steel-cable without fracture of wire, without disconnected burst are grid number critical value; No matter whether traction steel-cable vibrates in the process of traction, in the image of unit traction steel-cable after shooting, shared area is constant, and grid critical value is the area that standard traction steel-cable should account for.
H, by the pixel grid number of the gray level image matrix of the elevator dragging wire rope photograph of BR and the comparison of grid number critical value, the number of times that is greater than grid critical value when pixel grid number is greater than or equal to alarm 5000 times, what pixel grid number was greater than that grid critical value represents in actual conditions is the phenomenon of fracture of wire, because the photograph that ccd camera is taken be all plane and elevator dragging wire rope is three-dimensional, steel wire has broken afterwards because the effect meeting of tension force is opened to surrounding, and main body wire rope can't be vacated one in image, after wire rope opens on the contrary, image can have more the area of that a part of steel wire breaking, the situation of elevator dragging wire rope sub-fraction fracture of wire can allow simultaneously, after only having small damage accumulation to a certain extent, in all comparisons, pixel grid number is greater than grid critical value 5000 times when above, just need elevator stop transport and overhaul.
G, at definite traction steel-cable without fracture of wire, in the situation of disconnected steel cable, take standard traction steel-cable, the pixel grid number that image obtains after processing is disconnected value of stocks, by the pixel grid number of the elevator dragging wire rope photograph of BR and disconnected value of stocks comparison, when being less than disconnected value of stocks, pixel grid number reports to the police at once; Fracture of wire can cause pixel grid number bigger than normal, but disconnected stock market-circumstance condition is different, owing to being disconnected thigh, the strand steel wire rope disconnecting there will not be in image, and pixel grid number can, much smaller than grid number critical value, approach disconnected value of stocks, will report to the police immediately this time, stops elevator operation.
In order to coordinate a kind of broken strand of steel cable, method for detecting broken wire, inventor has designed disconnected strand of a kind of traction steel-cable, circuit wire detecting device, comprise and be arranged on elevator dragging wire rope mount pad, CCD camera, camera α angle adjusting bolt group, lower of camera, camera β angle adjusting bolt group, camera mount pad, plate shooting background plate on one side, described mount pad is arranged on the top of the sub-steel of two joints " work ", mount pad is arranged on to the below of machine bed.The not strong light-coloured coating spray of reflective for shooting background plate, is as the criterion with the low gray scale of photo background.The guide piece coordinating with wire rope is set near mount pad, and guide piece is comprised of 4 angle sheaves, and angle sheave comprises rolling bearing, rubber outer ring, central shaft, bearing collar, register pin, angle sheave is a row between two, be divided into two rows, elevator dragging wire rope be limited to the centre of two angle sheaves, realize many elevator dragging wire ropes side by side, and make to leave certain interval between elevator dragging wire rope, coordinate A step of the present invention; In figure, the centre position of upper and lower two groups of angle sheaves arranges mount pad.
CCD phase function automatic shooting picture carries out pre-service and is transferred to computer, then carries out gray scale processing.In figure, camera can carry out the adjustment of two angle directions in α angle and β angle, while adjusting α angle, in order to adjust the upward view angle of taking pictures, guarantees that photo finds a view within the scope of background board; Camera β angle adjusting bolt group is adjusted the level angle of ccd camera and elevator dragging wire rope, and ccd camera can be taken pictures from a plurality of angles.
Above-described is only the preferred embodiment of the present invention; should be understood that; for a person skilled in the art; do not departing under the prerequisite of structure of the present invention; can also make some distortion and improvement; these also should be considered as protection scope of the present invention, and these can not affect effect of the invention process and practical applicability.
Claims (3)
1. broken strand of steel cable, a method for detecting broken wire, is characterized in that, comprise the following steps,
A, on the operating path of traction steel-cable installation and guide device, make traction steel-cable when the guide piece, between adjacent traction steel-cable, have fixing gap,
B, use digital camera take pictures and store photograph there being the traction steel-cable of fixed interval (FI) to carry out timing,
C, photograph is carried out to gray scale processing, obtains a gray level image matrix,
D, at definite traction steel-cable, take standard traction steel-cable without fracture of wire, without disconnected burst in the situation that, the traction steel-cable digital photo computer of standard obtains gray level image matrix after treatment, according to the gray-scale value that has wire rope position location of pixels, obtain a gray scale critical value
Gray-scale value and the comparison of gray scale critical value of E, each pixel of use gray level image matrix, total pixel quantity that the gray-scale value of pixel is greater than gray scale critical value is pixel grid number,
F, the pixel grid number that obtains gray level image matrix of taking in the situation that determining traction steel-cable without fracture of wire, without disconnected burst are grid number critical value,
H, by the pixel grid number of the gray level image matrix of the elevator dragging wire rope photograph of BR and the comparison of grid number critical value, the number of times that is greater than grid critical value when pixel grid number is greater than or equal to alarm 5000 times,
G, at definite traction steel-cable without fracture of wire, in the situation of a disconnected thigh, take standard traction steel-cable, the pixel grid number that image obtains after processing is disconnected value of stocks, by the pixel grid number of the elevator dragging wire rope photograph of BR and disconnected value of stocks comparison, when being less than disconnected value of stocks, pixel grid number reports to the police at once.
2. a kind of broken strand of steel cable as claimed in claim 1, method for detecting broken wire, is characterized in that, described digital camera is ccd camera.
3. a kind of broken strand of steel cable as claimed in claim 1, method for detecting broken wire, is characterized in that, described camera 3 to 4 second beats are taken the photograph a sheet photo.
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| CN201410308323.7A CN104063716A (en) | 2014-07-01 | 2014-07-01 | Method for detecting breaking strand or wire of wire rope |
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| CN201410308323.7A CN104063716A (en) | 2014-07-01 | 2014-07-01 | Method for detecting breaking strand or wire of wire rope |
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| CN104495471A (en) * | 2014-12-03 | 2015-04-08 | 宁波大学 | Method and device for detecting line break and paper break in papyrus production line |
| CN105738466A (en) * | 2016-04-18 | 2016-07-06 | 中国矿业大学(北京) | Digital steel wire rope flaw detection sensor |
| CN108350650A (en) * | 2015-10-21 | 2018-07-31 | 比伯拉赫利勃海尔零部件有限公司 | A kind of high strength fibre rope of identification hoisting apparatus replaces the device of state |
| CN111901559A (en) * | 2020-07-08 | 2020-11-06 | 胡飞青 | System and method for recognizing breaking state of protective rope body |
| CN114660257A (en) * | 2022-03-11 | 2022-06-24 | 江阴兴澄特种钢铁有限公司 | Flaw detection device for steel wire rope |
| CN114803776A (en) * | 2022-06-07 | 2022-07-29 | 江苏省特种设备安全监督检验研究院 | Elevator steel wire rope safety detection method and device based on machine vision |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104495471A (en) * | 2014-12-03 | 2015-04-08 | 宁波大学 | Method and device for detecting line break and paper break in papyrus production line |
| CN108350650A (en) * | 2015-10-21 | 2018-07-31 | 比伯拉赫利勃海尔零部件有限公司 | A kind of high strength fibre rope of identification hoisting apparatus replaces the device of state |
| CN105738466A (en) * | 2016-04-18 | 2016-07-06 | 中国矿业大学(北京) | Digital steel wire rope flaw detection sensor |
| CN111901559A (en) * | 2020-07-08 | 2020-11-06 | 胡飞青 | System and method for recognizing breaking state of protective rope body |
| CN111901559B (en) * | 2020-07-08 | 2021-06-01 | 南京幸庄科技创新产业园管理有限公司 | System and method for recognizing breaking state of protective rope body |
| WO2022007127A1 (en) * | 2020-07-08 | 2022-01-13 | 胡飞青 | System and method for identifying fracture state of protective rope body |
| CN114660257A (en) * | 2022-03-11 | 2022-06-24 | 江阴兴澄特种钢铁有限公司 | Flaw detection device for steel wire rope |
| CN114660257B (en) * | 2022-03-11 | 2024-05-17 | 江阴兴澄特种钢铁有限公司 | Flaw detection device for steel wire rope |
| CN114803776A (en) * | 2022-06-07 | 2022-07-29 | 江苏省特种设备安全监督检验研究院 | Elevator steel wire rope safety detection method and device based on machine vision |
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Application publication date: 20140924 |