CN111891688B - Dust cover cleanliness detection device and method of belt longitudinal tearing detection device - Google Patents
Dust cover cleanliness detection device and method of belt longitudinal tearing detection device Download PDFInfo
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- CN111891688B CN111891688B CN202010778710.2A CN202010778710A CN111891688B CN 111891688 B CN111891688 B CN 111891688B CN 202010778710 A CN202010778710 A CN 202010778710A CN 111891688 B CN111891688 B CN 111891688B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
- B65G43/02—Control devices, e.g. for safety, warning or fault-correcting detecting dangerous physical condition of load carriers, e.g. for interrupting the drive in the event of overheating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G21/00—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors
- B65G21/08—Protective roofs or arch supports therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G45/00—Lubricating, cleaning, or clearing devices
- B65G45/10—Cleaning devices
- B65G45/22—Cleaning devices comprising fluid applying means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The invention discloses a dust cover cleanliness detection device and method of a belt longitudinal tearing detection device, and mainly relates to the field of detection devices matched with belt conveyor intelligent detection equipment. The device comprises a transparent dust cover rotatably arranged in a tearing detection device, a laser emitter and a projection camera are further arranged in the dust cover, a projection bin matched with the laser emitter is further arranged in the tearing detection device, and the projection bin is positioned on the outer side of the dust cover, and the device has the advantages that: detect the user state of dust cover at any time, can reduce the dust cover and take place the misdetection risk after stained to can in time feed back maintainer equipment state, in time change the dust cover.
Description
Technical Field
The invention relates to the field of detection devices matched with belt conveyor intelligent detection equipment, in particular to a dust cover cleanliness detection device and method of a belt longitudinal tearing detection device.
Background
The belt longitudinal tearing detection device is always a matching device for urgent needs of a belt conveyor, and the main detection devices in the current market are of several types, one type is a strip-shaped plate pressure switch, a strip-shaped anti-tearing switch, a detection device based on ultrasonic waves and a material leakage detector, and the type of the detection devices has high installation requirements and can be triggered only when the belt is seriously deformed due to serious tearing, so that the detection is easy to leak; one is based on a belt embedded with an electromagnetic induction coil, and the tearing is judged through electromagnetic induction, which cannot be used universally and has high cost; one type is a detection device based on vision or laser radar, which basically solves the defects of the two types, has high detection precision and high sensitivity, can detect the tear at the stage of the tear, but has poor anti-interference capability, and is mainly reflected in the waterproof and dustproof problems.
In order to solve the problem of the anti-interference capability of a tearing detection device based on vision or laser radar, the conventional method is to add a transparent cylindrical dust cover outside an industrial camera or laser radar, rotate continuously and equip a cleaning device, avoid dust accumulation of the dust cover and ensure cleanness.
With the dust cover and the cleaning device, the problem of poor anti-interference capability of the tearing detection device based on vision or laser radar is solved, but the problem of short service life is also brought. Because the dust cover does not have very high hardness usually, long-term continuous contact washs and arouses the fish tail easily, makes the dust cover more and more be difficult to the sanitization, forms stained to lead to the false detection, if change untimely, just can not in time detect out the belt and tear, will seriously influence belt conveyor's work efficiency, especially in the serious use scene of dust, can accelerate the wearing and tearing of dust cover surface, and life only is short for several weeks usually, will influence the detection to the belt.
Disclosure of Invention
The invention aims to provide a dust cover cleanliness detection device and a dust cover cleanliness detection method for a belt longitudinal tearing detection device, which can detect the use state of a dust cover at any time, reduce the false detection risk after the dust cover is stained, feed back the equipment state of maintenance personnel in time and replace the dust cover in time.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the dust cover cleanliness detection device of the belt longitudinal tearing detection device comprises a transparent dust cover rotatably arranged in the tearing detection device, a laser emitter and a projection camera are further arranged in the dust cover, a projection bin matched with the laser emitter is further arranged in the tearing detection device, and the projection bin is positioned on the outer side of the dust cover;
the laser emitter is used for enhancing abnormal characteristics when dirt exists on the transparent dustproof cover;
the projection bin is internally provided with projection cloth, and the projection cloth is used for projecting line laser emitted by the laser emitter;
the projection camera is used for shooting and acquiring laser projection on the projection cloth.
Further, the anomaly feature is a scratch, stain, or other smudge feature on the dust cover that causes laser distortion.
Furthermore, the projection cloth is made of materials which are not easy to be stained with dust, and mirror reflection cannot be generated.
The use method of the dust cover cleanliness detection device of the belt longitudinal tear detection device comprises the following steps:
the method comprises the following steps: continuously acquiring projection image frames of laser emitted by a laser emitter through a projection camera;
step two: extracting sub-pixel coordinates of the center of the laser line from each frame of image of the projection image frame in the step one, and analyzing and storing line characteristics in a normal state;
step three: comparing the characteristic difference between the abnormal state of the laser line and the normal state of the laser line in the step two, judging whether the image frame is stained or abnormal through a set abnormal judgment threshold value, recording the position of a dust cover detected by the image frame, and filtering the influence of the position on belt imaging in the processing process of the tearing detection unit by combining the rotating speed of the dust cover;
step four: and finally determining the cleaning degree of the dust cover through the definition of the set cleaning degree according to the abnormal judgment result of the image frames in the third step, and detecting whether the equipment is normal.
Further, the line features include dip, intercept, gradient, and continuity features.
Further, the anomaly determination threshold includes a dip angle, an intercept, and a gradient threshold.
Further, the cleanliness is defined as the probability of the presence of a dirty frame in successive image frames.
Compared with the prior art, the invention has the beneficial effects that:
1. the belt longitudinal tearing detection device based on vision is more complete in function, and the improvement of the self-checking function enables equipment maintenance to be more timely, convenient and intelligent;
2. the invention can detect the use state of the dust cover in real time, reduces the false detection risk of the detection of the tearing detection device caused by the abrasion service life problem of the dust cover, and improves the reliability of the product.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a side structural cross-sectional view of the present invention.
Fig. 3 is a main flow diagram of the detection method of the present invention.
FIG. 4 is a flow chart of parameter calibration of the detection method of the present invention.
Reference numerals shown in the drawings:
1. a tear detection device; 2. a dust cover; 3. a laser transmitter; 4. a projection camera; 5. a projection bin; 6. a projection cloth; 7. detecting a camera; 8. a control cabin; 9. water spraying and air jetting ports; 10. a fender is provided.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the present application.
Example 1: a dust cover cleanliness detection device of a belt longitudinal tearing detection device comprises two transparent glass dust covers 2 rotatably arranged in a tearing detection device 1, wherein one dust cover 2 is used for shooting waterproof and dustproof of a detection camera 7 of an upper belt, the other dust cover 2 is used for waterproof and dustproof of a laser emitter 3 and a projection camera 4, in order to prevent dust as much as possible, the outer shell of the tearing detection device 1 enables the dust cover 2 to almost only expose the range of the visual field size of the detection camera 7 and the sending range size of the laser emitter 3, a control cabin 8 is arranged on one side of the tearing detection device 1, a motor and a control chip are arranged in the control cabin 8, the dust cover 2 can rotate for 7 hours and 24 hours under the driving of the motor, the rotating speed is set to 20 revolutions per minute, a cleaning part of the device comprises a water spray, an air jet 9 and a mudguard 10, and the dust cover 2 is cleaned by adopting a strategy of firstly water spray cleaning and then air jet drying, the surface of the dust cover 2 is guaranteed to be clean by combining with a mudguard 10, a projection bin 5 matched with the laser emitter 3 is further arranged in a control bin 8 on one side of the tearing detection device 1, the projection bin 5 is located on the outer side of the dust cover 2, the opening of the projection bin 5 is downward in an inclined mode, and projection cloth 6 is arranged in the projection bin 5;
the projection cloth 6 is made of a material which is not easy to be stained with dust and does not generate mirror reflection, the projection cloth 6 is used for linear laser emitted by the projection laser emitter 3, and the projection cloth 6 is over against the opening of the projection bin 5, so that the projection cloth 6 can be prevented from being polluted;
the projection camera 4 is used for shooting and acquiring laser projection on the projection cloth 6, laser lines on the projection cloth 6 are clearly imaged through the projection camera 4 and transmitted into the control chip for analysis and processing, and the range of the dust cover 2 influencing the visual field of the projection camera 4 is basically consistent with that of the detection camera 7; when the dust cover 2 is not cleaned, the laser line is shielded when the stained area passes through the visual field range of the projection camera 4, and the image acquired by the projection camera 4 has obvious abnormal characteristics;
the laser emitter 3 is used to enhance the abnormal characteristics of dirt on the transparent dust cover 2, such as scratches, dirt, or other dirt characteristics on the dust cover 2 that cause laser deformation.
The whole body is used for optimizing and supplementing the structure of the tearing detection device 1.
Example 2: the method for detecting the cleanliness of the dust cover of the belt longitudinal tearing detection device is characterized by comprising the following steps: the method comprises the following steps:
continuously acquiring projection image frames of laser emitted by a laser emitter 3 through a projection camera 4; extracting sub-pixel coordinates of the center of a laser line from each frame of image of a projection image frame, and analyzing and storing line characteristics in a normal state, wherein the line characteristics comprise inclination angle, intercept, gradient and continuity characteristics; comparing the characteristic difference between the abnormal state and the normal state of the laser line, judging whether the image frame is stained or abnormal through a set abnormal judgment threshold value, recording the position of a dust cover 2 detected by the image frame, and filtering the influence of the position on belt imaging in the processing process of a tearing detection unit by combining the rotating speed of the dust cover 2, wherein the abnormal judgment threshold value comprises an inclination angle, an intercept and a gradient threshold value; and finally determining the cleaning degree of the dust cover 2 and whether the detection equipment is normal or not through the set definition of the cleanliness defined as the probability of the stained frames in the continuous image frames according to the abnormal judgment result of the continuous image frames.
As shown in fig. 4, it is a parameter calibration flowchart of the method for detecting the cleanliness of the dust cover of the belt longitudinal tear detection device provided in this embodiment. After the device leaves the factory and is installed, a parameter calibration process can be implemented, when calibration is carried out, the dust cover 2 and the projection cloth 6 are ensured to be clean, after the projection camera 4 is connected, images are continuously read, the center of a laser line is extracted in the whole image range, a corresponding imaging area in the current image is intercepted according to the actual influence area of the dust cover 2 on the tearing detection process, and the area is recorded; extracting features of inclination angle, intercept and gradient of the laser line in the area, acquiring a feature range in a current normal state, and determining and recording a feature threshold;
as shown in fig. 3, a main flow chart of the method for detecting the cleanliness of the dust cover of the belt longitudinal tear detection device according to the present embodiment is shown. The whole process comprises three functions: the projection camera 4 is connected with a state self-checking function, the laser emitter 3 is connected with the state self-checking function, and the dust cover 2 is connected with a cleanliness detection function; the time of one rotation of the dust hood 2 is taken as the judgment time length; when the continuous frames can not read the images, judging that the connection of the projection camera 4 is abnormal; when the laser line cannot be detected in the continuous frames, the laser emitter 3 is judged to be abnormal; and after the laser lines are normally extracted from the continuous frames, comparing the laser lines with the characteristics of the standard laser lines, storing the result of each frame in a queue, calculating the maximum frame number in the queue according to the rotating speed of the dust cover 2 and the frame rate of image processing, and defining the ratio of the total number of the normal frames in the queue to the total number of the queue frames as the cleanliness.
The belt longitudinal tearing detection device based on vision is more complete in function, the equipment maintenance is more timely, more convenient and more intelligent due to the perfection of the self-checking function, the tearing detection error detection risk caused by the service life problem of the dust cover of the tearing detection device is reduced, and the reliability of products is improved.
Claims (8)
1. Belt vertically tears detection device's dust cover cleanliness detection device, install transparent dust cover (2) in tearing detection device (1) including rotating, its characterized in that: a laser emitter (3) and a projection camera (4) are further arranged in the dust cover (2), a projection bin (5) matched with the laser emitter (3) is further arranged in the tearing detection device (1), and the projection bin (5) is located on the outer side of the dust cover (2);
the laser emitter (3) is used for enhancing abnormal characteristics when dirt exists on the transparent dust cover (2);
a projection cloth (6) is arranged in the projection bin (5), and the projection cloth (6) is used for projecting line laser emitted by the laser emitter (3);
the projection camera (4) is used for shooting and acquiring laser projection on the projection cloth (6).
2. The dust cover cleanliness detection device of the belt longitudinal tear detection device according to claim 1, characterized in that: the anomaly feature is an insult feature on the dust cover (2) that causes laser distortion.
3. The dust cover cleanliness detection device of the belt longitudinal tear detection device according to claim 2, characterized in that: the soiling characteristics include scratches, stains.
4. The dust cover cleanliness detection device of the belt longitudinal tear detection device according to claim 1, characterized in that: the projection cloth (6) is made of a material which is not easy to be stained with dust, and mirror reflection cannot be generated.
5. A use method of the dust cover cleanliness detection device of the belt longitudinal tear detection device according to any one of claims 1 to 4, characterized by comprising: the method comprises the following steps:
the method comprises the following steps: continuously acquiring projection image frames of laser emitted by a laser emitter (3) through a projection camera (4);
step two: extracting sub-pixel coordinates of the center of the laser line from each frame of image of the projection image frame in the step one, and analyzing and storing line characteristics in a normal state;
step three: comparing the characteristic difference between the abnormal state of the laser line and the normal state of the laser line in the step two, judging whether the image frame is stained or abnormal through a set abnormal judgment threshold value, recording the position of a dust cover (2) detected by the image frame, and filtering the influence of the position on belt imaging in the processing process of a tearing detection unit by combining the rotating speed of the dust cover (2);
step four: and finally determining the cleaning degree of the dust cover (2) through the set cleanliness definition and detecting whether the equipment is normal or not according to the abnormal judgment result of the image frames in the third step.
6. The use method of the dust cover cleanliness detection device of the belt longitudinal tear detection device according to claim 5, characterized in that: the line features include dip, intercept, gradient, and continuity features.
7. The use method of the dust cover cleanliness detection device of the belt longitudinal tear detection device according to claim 5, characterized in that: the anomaly determination threshold includes a dip angle, an intercept, and a gradient threshold.
8. The use method of the dust cover cleanliness detection device of the belt longitudinal tear detection device according to claim 5, characterized in that: the cleanliness is defined as the probability of a stained frame being present in successive image frames.
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| DE69905109D1 (en) * | 1998-08-25 | 2003-03-06 | Nec Corp | Device and method for measuring voltages in the crystal lattice |
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