CN115086522B - Bar-shaped metal surface image acquisition method - Google Patents
Bar-shaped metal surface image acquisition method Download PDFInfo
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- CN115086522B CN115086522B CN202210659201.7A CN202210659201A CN115086522B CN 115086522 B CN115086522 B CN 115086522B CN 202210659201 A CN202210659201 A CN 202210659201A CN 115086522 B CN115086522 B CN 115086522B
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- rod
- shaped metal
- conveying device
- interception
- linear array
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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
- B65G23/00—Driving gear for endless conveyors; Belt- or chain-tensioning arrangements
- B65G23/22—Arrangements or mountings of driving motors
-
- 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
- B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
- B65G47/02—Devices for feeding articles or materials to conveyors
- B65G47/04—Devices for feeding articles or materials to conveyors for feeding articles
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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
- B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
- B65G47/74—Feeding, transfer, or discharging devices of particular kinds or types
- B65G47/88—Separating or stopping elements, e.g. fingers
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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 relates to a method for acquiring an image of a rod-shaped metal surface. The rod-shaped metal rotates at a constant speed in situ through the conveyor belt and the interception device, so that shaking of the rod-shaped metal is reduced; meanwhile, the conveyor belt drives the rotating shaft of the encoder to rotate, and the pulse control linear array camera is generated to continuously scan the bar metal, so that the complete surface image of the bar metal is obtained. The invention has the beneficial effects that the acquisition mode is convenient and quick, the speed of acquiring the rod-shaped metal surface image is improved, and the reality and high definition of the acquired rod-shaped metal surface image can be ensured.
Description
Technical Field
The invention relates to the field of metal image acquisition, in particular to a rod-shaped metal surface image acquisition method.
Background
In industrial production, the surface of the rod-shaped metal is easy to form defects of cracks, holes, scratches, corrosion and the like, and in order to ensure the quality of bar production and manufacturing and improve the economic benefit, defective rod-shaped metals need to be removed and recycled.
Currently, most factories still adopt manual visual inspection to discriminate defects. Because the rod-shaped metal is tiny, the defect is tiny, the surface reflects light, and the problems of high labor cost, high false detection rate, low detection efficiency and the like exist in manual eye. The rod-shaped metal industrial site needs a high-speed and high-precision surface defect recognition technology to replace manual visual defects, and the image acquisition of the rod-shaped metal surface is a precondition of the realization of the surface defect recognition technology, and the acquired image quality directly influences the speed and accuracy of defect recognition.
The existing rod-shaped metal surface image acquisition method is often complicated in acquisition process and slow in acquisition speed, is difficult to realize automatic acquisition of a production line, and cannot meet the use requirements of industrial sites. In the mode of acquiring metal images by using a linear array camera commonly used in industry, rod-shaped metal is difficult to keep rotating at a constant speed, shake is easy to occur in the rotating process, and acquired images are easy to distort and blur. Therefore, an acquisition method is needed, the tungsten rod can stably rotate at a constant speed while the acquired image is fast and efficient, and the high definition of the image is ensured not to be distorted.
The prior patent and the defects thereof:
1. the Chinese patent application number is: CN201910099026.9, entitled: a metal shaft surface image acquisition method based on line scanning. According to the method, a linear array camera is determined according to the length of a metal shaft, metal shaft rotation module parameters are calculated according to the linear array camera parameters, the positions of the modules are arranged, a servo motor fixes the metal shaft through a clamp, the metal shaft is driven to rotate at a constant speed, illumination intensity is adjusted, and the linear array camera scans the metal shaft in a linear mode to acquire images. According to the method, the servo motor is used for connecting the metal shaft with the clamp, the problem of shake of the metal shaft caused by unstable connection of the clamp and the metal shaft is easy to occur, so that the image is fuzzy and distorted, scratches and other damages to the metal surface are possibly caused when the clamp clamps the metal shaft, and the image cannot be acquired by the clamped part of the clamp, so that the image is incomplete. And to many metal shafts gather the image, need the manual work constantly elasticity anchor clamps, dismantle the installation metal shaft, waste time and energy, can't realize industrial assembly line image acquisition.
2. The Chinese patent application number is: CN202110365113.1, entitled: a method for acquiring an image of the complete surface of a bar material. According to the method, four linear array cameras are used for respectively acquiring bar surface images from different angles, then bar pixel areas in the images are extracted through a segmentation model, correction of the bar images is carried out through a bending correction algorithm, conversion relations between image acquisition pixels of the cameras and the positions of objects are calculated, overlapping areas among the cameras are obtained and removed, and finally the images reserved by the cameras are transversely spliced to obtain a complete surface image of the bar. The method needs to use four linear array cameras simultaneously, the linear array cameras are high in manufacturing cost, the economical efficiency of industrial field production lines is not met, related software is matched, and the method is complex in calculation and affects the rapidity.
Disclosure of Invention
The invention aims to solve the problems of complex operation and slow acquisition speed of the rod-shaped metal surface image acquisition and distortion and blurring of the acquired image caused by shaking of the acquired image, and provides the rod-shaped metal surface image acquisition method.
In order to achieve the above purpose, the technical scheme of the invention is as follows: the rod-shaped metal surface image acquisition method is characterized in that a feeding device, a conveying device, an interception device, a linear array camera and a belt wheel encoder are provided, the conveying device is obliquely arranged, the feeding device is arranged above one high-level end of the conveying device, the interception device is arranged between one high-level end and one low-level end of the conveying device, the conveying device runs from one low-level end to one high-level end, the belt wheel encoder is arranged below the conveying device and is driven to rotate by the conveying device, and the method is specifically realized as follows:
s1, starting a conveying device, and automatically throwing rod-shaped metal into the conveying device by a feeding device, wherein the friction traction force of the rod-shaped metal given by the conveying device cannot counteract the gravity component force of the rod-shaped metal, so that the thrown rod-shaped metal rolls towards the lower end of the conveying device;
s2, the blocking device blocks the rod-shaped metal rolling towards the lower end of the conveying device, so that the rod-shaped metal is blocked to rest on the edge of the blocking device and does in-situ uniform rotation;
s3, the belt wheel encoder is driven by the transmission device to rotate to generate pulses, pulse signals are used as input of an external trigger interface of the linear array camera, the linear array camera receives the pulse signals to scan the rod-shaped metal in a continuous multi-line mode, and a complete surface image of the rod-shaped metal is obtained.
In an embodiment of the invention, the lighting module is located obliquely above the rod-shaped metal and is used for uniformly polishing the surface of the rod-shaped metal.
In an embodiment of the invention, the feeding device is a V-type feeder.
In an embodiment of the invention, the conveying device is a belt conveyor.
In an embodiment of the present invention, the transmission device is obliquely arranged at an inclination angle of 5 ° to 10 °.
In one embodiment of the invention, the surface of the conveyer belt of the conveying device is flat, and the shaking of the rod-shaped metal caused by the concave-convex part of the surface of the conveyer belt is prevented.
In an embodiment of the invention, the linear array camera is positioned right above the position where the rod-shaped metal is stopped by the interception device, so that the shooting view of the linear array camera is completely parallel to the rod-shaped metal which is rotating at a uniform speed in situ.
In one embodiment of the present invention, a gap is provided between the interception device and the transfer device, through which the rod-shaped metal cannot pass.
In one embodiment of the invention, the interception edge of the interception device, which is contacted with the rod-shaped metal, is kept smooth, so that the damage to the surface of the metal and the shaking caused by the damage are avoided, and the rotation stability of the rod-shaped metal is ensured.
In one embodiment of the invention, the interception edge is ensured not to incline horizontally, so that the rod-shaped metal which is stopped at the interception edge and does rotary motion is prevented from moving transversely along the interception edge due to inclination and separating from the acquisition view of the linear array camera.
Compared with the prior art, the invention has the following beneficial effects:
1) The method for acquiring the bar-shaped metal patterns by using the conveyor belt is simple and quick in acquisition, improves the image acquisition efficiency, reduces the difficulty of acquiring the images on the surface of the bar-shaped metal, is convenient to further dock with an industrial production line, and realizes the image acquisition of the production line on an industrial site.
2) According to the invention, the belt conveyor and the interception device are matched to realize the in-situ uniform rotation of the rod-shaped metal, the tungsten rod rotates stably, shake is not easy to occur, real and clear imaging is ensured, and subsequent image processing is convenient.
Drawings
Fig. 1 is a side view of the overall structure of a collection device employed in the present invention.
FIG. 2 is a graph showing the stress analysis of a rod-shaped metal according to the present invention.
Fig. 3 is a flow chart of the method of the present invention.
Detailed Description
The technical scheme of the invention is specifically described below with reference to the accompanying drawings.
The invention relates to a bar-shaped metal surface image collecting method, which comprises a feeding device, a conveying device, an interception device, a linear array camera and a belt wheel encoder, wherein the conveying device is obliquely arranged, the feeding device is arranged above one high-level end of the conveying device, the interception device is arranged between one high-level end and one low-level end of the conveying device, the conveying device runs from one low-level end to one high-level end, the belt wheel encoder is arranged below the conveying device and is driven to rotate by the conveying device, and the bar-shaped metal surface image collecting method further comprises an illumination module which is arranged above the bar-shaped metal obliquely and is used for uniformly polishing the bar-shaped metal surface, and the method is specifically realized as follows:
s1, starting a conveying device, and automatically throwing rod-shaped metal into the conveying device by a feeding device, wherein the friction traction force of the rod-shaped metal given by the conveying device cannot counteract the gravity component force of the rod-shaped metal, so that the thrown rod-shaped metal rolls towards the lower end of the conveying device;
s2, the blocking device blocks the rod-shaped metal rolling towards the lower end of the conveying device, so that the rod-shaped metal is blocked to rest on the edge of the blocking device and does in-situ uniform rotation;
s3, the belt wheel encoder is driven by the transmission device to rotate to generate pulses, pulse signals are used as input of an external trigger interface of the linear array camera, the linear array camera receives the pulse signals to scan the rod-shaped metal in a continuous multi-line mode, and a complete surface image of the rod-shaped metal is obtained.
The following is a specific embodiment of the present invention.
1) The image acquisition device used by the invention mainly comprises a V-shaped feeder, a linear array camera, an industrial lighting lamp, a light regulator, a belt wheel encoder, a belt conveyor and an interception device, and is composed of a computer. The basic structure is shown in figure 1.
2) The heights of the supporting legs at the front end and the rear end of the belt conveyor are different, so that an inclination angle of 6 degrees is formed.
3) And a V-shaped feeder above the belt conveyor automatically throws rod-shaped metal to the high end of the supporting leg of the belt conveyor.
4) The belt conveyor is driven by a motor and is provided with a speed regulating assembly for regulating speed. The color of the transmission belt of the belt conveyor is black, so that the subsequent processing of images is facilitated.
5) The running speed of the belt conveyor is 0.07m/s, and the running direction of the upper surface of the conveyor belt is from the lower end of the supporting leg to the higher end of the supporting leg, so that the rod-shaped metal friction traction force on the conveyor belt is provided.
6) Because the inclination angle and the sliding friction coefficient of the conveying belt meet certain conditions, the gravity component force is larger than the friction traction force, and the thrown rod-shaped metal rolls downwards towards the lower end of the supporting leg.
7) The surface of the conveying belt of the belt conveyor is not smooth but flat, and has no rugged, so that the shaking of the rod-shaped metal caused by the rugged position is prevented.
8) The bar-shaped metal interception device is used for intercepting bar-shaped metal rolling towards the lower ends of the support legs, so that the bar-shaped metal is stopped at the edge of the interception device to rotate at a constant speed in situ, and the concrete steps are as follows:
8) A small gap is reserved between the middle part of the interception device and the conveying belt, so that rod-shaped metal cannot pass through the interception device, and the interception of downward rolling rod-shaped metal is realized.
9) The rod-shaped metal is stopped at the interception edge, the interception edge is kept smooth, the surface of the rod-shaped metal is prevented from being scratched or shake is caused, and the rod-shaped metal is ensured to rotate stably.
10 The interception edge is kept horizontal and not inclined, so that rod-shaped metal stopped at the interception edge is prevented from moving transversely along the edge and separating from the acquisition view of the linear array camera.
11 The rod-shaped metal intercepted at the intercepting edge is uniformly rotated by the traction force generated by friction between the bottom of the rod-shaped metal and the conveying belt due to the fact that the intercepting edge gives supporting force to complete interception and stopping, and accordingly uniform rotation of the rod-shaped metal in situ is achieved. The bar-shaped metal stress analysis is shown in fig. 2.
12 The industrial linear array camera is arranged right above the rod-shaped metal to be collected, and the camera shooting visual field is completely parallel to the rod-shaped metal which is rotating at a constant speed in situ.
13 The belt wheel encoder is fixed near the transmission belt through the encoder support, the round wheel is coaxially connected with the encoder rotating shaft, the transmission belt drives the round wheel to rotate through traction friction, the encoder rotating shaft rotates along with the rotation to generate pulses, pulse signals are used as the input of an external trigger interface of the linear array camera, and the camera receives the pulse signals to scan the rod-shaped metal in a continuous multi-line manner, so that a complete surface image of the rod metal is obtained.
14 The lighting module is positioned above the rod-shaped metal to be collected, the brightness of the industrial lighting lamp is adjusted through the lighting regulator to uniformly shine the surface of the rod-shaped metal, and the linear array camera collects images of a high-light area to obtain real and clear images of the surface of the metal.
15 The rod-shaped metal image acquisition flow is shown in fig. 3. The belt conveyor is matched with a specially designed interception device to realize in-situ uniform rotation of the rod-shaped metal, and simultaneously drives the rotary shaft of the encoder to rotate, so that pulses are provided for the linear array camera to acquire images, and complete surface images of the rod-shaped metal are acquired.
The above is a preferred embodiment of the present invention, and all changes made according to the technical solution of the present invention belong to the protection scope of the present invention when the generated functional effects do not exceed the scope of the technical solution of the present invention.
Claims (7)
1. The rod-shaped metal surface image acquisition method is characterized by providing a feeding device, a conveying device, an interception device, a linear array camera and a belt wheel encoder, wherein the conveying device is obliquely arranged, the feeding device is arranged above one high-level end of the conveying device, the interception device is arranged between one high-level end and one low-level end of the conveying device, the conveying device runs from one low-level end to one high-level end, the belt wheel encoder is arranged below the conveying device and is driven to rotate by the conveying device, and the method is specifically realized as follows:
s1, starting a conveying device, and automatically throwing rod-shaped metal into the conveying device by a feeding device, wherein the friction traction force of the rod-shaped metal given by the conveying device cannot counteract the gravity component force of the rod-shaped metal, so that the thrown rod-shaped metal rolls towards the lower end of the conveying device;
s2, the blocking device blocks the rod-shaped metal rolling towards the lower end of the conveying device, so that the rod-shaped metal is blocked to rest on the edge of the blocking device and does in-situ uniform rotation;
s3, the belt wheel encoder is driven by the transmission device to rotate to generate pulses, pulse signals are used as input of an external trigger interface of the linear array camera, the linear array camera receives the pulse signals to scan the rod-shaped metal in a continuous multi-line manner, and a complete surface image of the rod-shaped metal is obtained;
a gap through which the rod-shaped metal cannot pass exists between the interception device and the conveying device; the interception edge of the interception device, which is contacted with the rod-shaped metal, is kept smooth, so that the damage to the surface of the metal and the shake caused by the damage are avoided, and the rotation stability of the rod-shaped metal is ensured; the interception edge is ensured not to incline horizontally, and rod-shaped metal which is stopped at the interception edge and does rotary motion is prevented from moving transversely along the interception edge due to inclination and separating from the acquisition view of the linear array camera.
2. The method of claim 1, further comprising an illumination module positioned obliquely above the rod-shaped metal for uniformly polishing the surface of the rod-shaped metal.
3. The method for acquiring the image of the surface of the rod-shaped metal according to claim 1, wherein the feeding device is a V-shaped feeder.
4. The method for acquiring an image of a rod-shaped metal surface according to claim 1, wherein the conveying device is a belt conveyor.
5. The method for acquiring the image of the surface of the rod-shaped metal according to claim 1, wherein the transmission device is obliquely arranged at an inclination angle of 5-10 degrees.
6. The method for acquiring the image of the surface of the rod-shaped metal according to claim 1, wherein the surface of the conveyer belt of the conveying device is flat, and the shaking of the rod-shaped metal caused by the concave-convex part of the surface of the conveyer belt is prevented.
7. The method for acquiring the surface image of the rod-shaped metal according to claim 1, wherein the linear array camera is positioned right above the position where the rod-shaped metal is stopped by the interception device, so that the shooting view of the linear array camera is completely parallel to the rod-shaped metal which is rotating at a constant speed in situ.
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