CN111307824A - Pit defect detection device on surface of wooden board - Google Patents
Pit defect detection device on surface of wooden board Download PDFInfo
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- CN111307824A CN111307824A CN202010271799.3A CN202010271799A CN111307824A CN 111307824 A CN111307824 A CN 111307824A CN 202010271799 A CN202010271799 A CN 202010271799A CN 111307824 A CN111307824 A CN 111307824A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
- G01N21/898—Irregularities in textured or patterned surfaces, e.g. textiles, wood
- G01N21/8986—Wood
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
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- Wood Science & Technology (AREA)
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Abstract
The invention discloses a device for detecting pit defects on the surface of a wooden board, and belongs to the field of wood detection. The device includes horizontally conveying platform, conveying platform top is vertical to be provided with height-adjustable's shading baffle, one side of shading baffle is provided with the line source, and the opposite side is provided with the camera, the luminous direction orientation of line source the bottom of shading baffle, the line source sets up in the camera bellows with the camera lens, the camera is connected with the computer. The invention can solve the problem that the pit defect on the surface of the wood board in the prior art can not be automatically identified, and can realize the purpose of automatically identifying the surface defect of the board in the industrial production line by applying the detection device after further combining with other defects of the board identified by the prior art.
Description
Technical Field
The invention relates to the field of wood detection, in particular to a device for detecting pit defects on the surface of a wood board.
Background
The wooden board has the advantages of firmness, attractive appearance and the like, and is widely applied to industrial production in China and office and home environments of people. Along with the development of economy in China and the improvement of living standard of people, the use amount of the wood boards is more and more, and the production yield and the product variety of the wood board manufacturers are also continuously enlarged. Wood boards are of various types and can be basically divided into solid wood boards, multi-layer solid wood composite boards, shaving boards, reinforced boards and the like.
The production process of the wood board gradually tends to be perfect, and the technology of each link of the production equipment is mature more and more. However, in the production process of the wood board, due to uncontrollable factors existing in raw materials, adhesives and certain links in the production process, the defects of large shavings, adhesive spots, impurities, oil stains, small pits and the like are inevitably generated on the surface of the board. The generation of the surface defects of the board can cause the reduction of the quality and the grade of the board, seriously affect the aesthetic degree of lower-level products of the wood board and simultaneously cause great economic loss for manufacturers.
At present, manufacturers usually detect the wood board in a manual visual identification mode and classify the wood board in grades, and no mature detection equipment can completely identify the surface defects of the wood board.
In the study on the detection of the surface defects of the wood boards, many studies are made on defects (such as shavings, sundries, glue spots, oil stains and the like) which have a larger color difference with the surfaces of the wood boards, the detection principle is to take pictures of the surfaces of the wood boards by using a camera and then process the taken pictures, and the defects such as the shavings, the sundries, the glue spots, the oil stains and the like have a larger color difference with the surfaces of the wood boards, so that the defects can be detected by using a gray value comparison method, the surface defects of the wood boards can be identified, and the defects are used for dividing the grades of the wood boards.
However, in the plate production process, the small pit defects (generally, the small pit defects are considered as long, wide and higher than 3mm 2 mm) generated by worm damage, uneven glue mixing, collision and the like of the raw materials have little difference between the color and the surface of the plate, the original plate surface is used for photographing, and then the gray level recognition mode cannot be recognized. This is the biggest reason why the wooden board surface defect inspection equipment has not been used in the actual inspection field.
Disclosure of Invention
In order to solve the technical problems, the invention provides a pit defect detection device for the surface of a wood board, which can automatically identify pit defects on the surface of the wood board and can realize automatic identification of the surface defects of the board by combining with an identification device for other defects of the board.
The technical scheme provided by the invention is as follows:
the pit defect detection device comprises a horizontal conveying table, a shading baffle with adjustable height is vertically arranged above the conveying table, a line light source is arranged on one side of the shading baffle, a camera is arranged on the other side of the shading baffle, the light emitting direction of the line light source faces the bottom of the shading baffle, the line light source and the camera lens of the camera are arranged in a camera bellows, and the camera is connected with a computer.
Further, the conveying table comprises a base, a conveying belt is mounted on the base, a driving shaft and a driven shaft are respectively arranged at the front end and the rear end of the conveying belt, and the driving shaft is connected with a driving motor; the base is provided with panel guider on the left and right sides.
Further, the quantity of conveyer belt is a plurality of, and a plurality of conveyer belts parallel arrangement side by side is provided with the conveyer belt welt on the base, the base bottom is provided with the switch board, driving motor sets up on the landing leg of base.
Furthermore, a vertical supporting frame is arranged on the base, the shading baffle is arranged in the supporting frame, a servo motor for controlling the shading baffle to move up and down is arranged on the supporting frame, and the servo motor is connected with the shading baffle through a lead screw.
Furthermore, a position sensor for detecting the position of the wood board is arranged at the supporting frame or on the supporting frame on the base, a laser ranging sensor for measuring the distance between the lower edge of the shading baffle and the upper surface of the wood board is arranged at the bottom of the shading baffle, and the position sensor, the laser ranging sensor and the servo motor are connected with the controller.
Furthermore, the supporting frame is of a gantry structure, the number of the servo motors is two, the two servo motors are respectively located on the stand columns on the left side and the right side of the gantry structure, the two servo motors are respectively connected with the left side and the right side of the shading baffle through lead screws, the number of the laser ranging sensors is two, and the two laser ranging sensors are located on the left side and the right side of the bottom of the shading baffle.
Further, the camera bellows is including setting up light source box and the detection case in shading baffle both sides, the line source sets up in the light source box, the non-reflective material is posted to the detection incasement wall, the camera lens setting of camera is in the detection case, the quantity of camera is two.
Further, the thickness of the lower edge of the shading baffle is 0.5mm, and the distance between the lower edge of the shading baffle and the upper surface of the wood plate is controlled to be 0.5 +/-0.1 mm.
Further, the position sensor is a photoelectric switch, and the position sensor is arranged on the base and positioned below the shading baffle.
The invention has the following beneficial effects:
the invention provides a device for detecting pit defects on the surface of a wood board, which can solve the problem that pit defects on the surface of the wood board cannot be automatically identified in the prior art, and can realize the purpose of automatically identifying the surface defects of the boards in an industrial production line by applying the detection device after further combining other defects of the boards identified in the prior art.
Drawings
FIG. 1 is a schematic view of a device for detecting a pit defect on a surface of a wooden board according to the present invention;
FIG. 2 is a schematic view of FIG. 1 with the detection chamber removed;
FIG. 3 is a schematic view of the apparatus for detecting a pit defect on a surface of a wood board according to the present invention;
FIG. 4 is a schematic view of FIG. 3 with the light source box (the reserve line light source) removed;
FIG. 5 is a schematic view of FIG. 3 with the light box and line light source removed.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The embodiment of the invention provides a pit defect detection device for the surface of a wood board, which comprises a horizontal conveying table 1, wherein a shading baffle plate 2 with adjustable height is vertically arranged above the conveying table 1, a linear light source 3 is arranged on one side of the shading baffle plate 2, a camera 4 is arranged on the other side of the shading baffle plate 2, the light emitting direction of the linear light source 3 faces to the bottom of the shading baffle plate 2, the linear light source 3 and a lens of the camera 4 are arranged in a dark box 5, and the camera 4 is connected with a computer.
When the device is used, the wooden plate is placed on the horizontal conveying table to be conveyed, so that the wooden plate to be measured stably runs on the conveying table, the vertical opaque shading baffle with the adjustable height is arranged above the horizontal conveying table, and when the wooden plate reaches the shading baffle, the height of the shading baffle is adjusted, so that the lower edge of the shading baffle and the upper surface of the wooden plate are controlled to be at a proper gap distance. A continuous line light source is arranged on one side of the shading baffle plate, the type of the line light source is a non-delay starting type, and the light emitting direction of the line light source faces to the gap between the lower edge of the shading baffle plate and the upper surface of the wood plate, so that a light band with uniform width can be observed on the other side of the shading baffle plate at the gap; a picture of the band of light is taken at the side using a camera and sent to a computer for processing. The camera is connected with the camera through a camera lens, and the camera is connected with the camera through a camera lens.
When the panel that awaits measuring passes through the shading baffle with normal surface, the light band is regular rectangular shape, and its shape can not change, and when the pit defect appears on the panel surface that awaits measuring, the light band width changes, and the shape of light band becomes anomalous shape from regular rectangular shape, gathers the change condition of light band width through the camera to handle real-time image through the computer, can differentiate whether wooden panel surface has the pit defect: when the light band has an irregular shape, judging that the surface of the detected plate has a pit defect, otherwise, judging that the surface of the detected plate has no pit defect.
The invention is not limited to the method for detecting the shape of the light band by the computer, and for example, the shape of the light band can be detected by a gray scale detection method, because the gray scale of the light band is greatly different from the gray scale of other parts in the picture, and the gray scale detection method can be used for detecting the shape of the light band. For example, the shape of the optical tape can be obtained by detecting the edge of the optical tape by an edge detection method, in which the change in the pixel value at the boundary between the optical tape and the photo background is large.
The invention provides a device for detecting pit defects on the surface of a wood board, which can solve the problem that pit defects on the surface of the wood board cannot be automatically identified in the prior art, and can realize the purpose of automatically identifying the surface defects of the boards in an industrial production line by applying the detection device after further combining other defects of the boards identified in the prior art.
The invention is not limited to a specific structure of the transfer table as long as it can make the wooden boards run smoothly horizontally, and a specific example of the structure of the transfer table is:
the conveying table 1 comprises a base 6, a conveying belt 7 is mounted on the base 6, a driving shaft 8 and a driven shaft 9 are respectively arranged at the front end and the rear end of the conveying belt 7, and the driving shaft 8 is connected with a driving motor 10; the base 6 is provided with plate guides 11 on the left and right sides.
The number of the conveyor belts 7 is multiple, the conveyor belts 7 are arranged in parallel side by side, a conveyor belt lining plate 12 is arranged on the base 6, a control cabinet 13 is arranged at the bottom of the base 6, and the driving motor 10 is arranged on a supporting leg 14 of the base 6.
During the use, start driving motor through the switch board, driving motor drives the drive shaft rotation to make a plurality of conveyer belts that set up side by side convey wooden board on it, the driven shaft plays the effect of supplementary conveyer belt conveying. The plate guiding device can rightly the plate according to a certain angle in the process of conveying the wood plates, so that the wood plates are prevented from inclining, and then the wood plates are sent into the lower portion of the shading baffle plate to be detected. The conveying table with the structure can provide stable and continuous power for the movement of the wooden boards.
And the speed of the conveyor belt is generally set to be less than 600mm/s, the next plate is detected after one plate is detected, preferably, the time interval between the front and the back plates to be detected is 10s, in the time interval, all pictures shot by the front plate to be detected are processed by the computer, a judgment result is given, and then the back plate is detected.
In order to facilitate the installation of the light-shielding baffle, a vertical supporting frame 15 is provided on the base 6, and the light-shielding baffle 2 is disposed in the supporting frame 15 and can move up and down in the supporting frame 15.
In the invention, the height of the shading baffle can be manually adjusted or automatically adjusted, when the height of the shading baffle is automatically adjusted, a servo motor 16 for controlling the shading baffle 2 to move up and down is arranged on the supporting frame 15, and the servo motor 16 is connected with the shading baffle 2 through a screw rod. And a position sensor 18 for detecting the position of the wood plate 17 is arranged at the supporting frame 15 or on the supporting frame 15 on the base 6, a laser distance measuring sensor 19 for measuring the distance between the lower edge of the light shielding baffle 2 and the upper surface of the wood plate 17 is arranged at the bottom of the light shielding baffle 2, and the position sensor 18, the laser distance measuring sensor 19 and the servo motor 16 are connected with the controller.
When the front edge of the wooden plate reaches the shading baffle, triggering the position sensor, the laser ranging sensor and the camera to start working; the laser ranging sensor continuously measures the distance between the lower edge of the shading baffle and the upper surface of the wood board, and the servo motor controls the shading baffle to move up and down according to the measured distance, so that the distance between the lower edge of the shading baffle and the upper surface of the wood board is controlled to be a proper distance, and the distance is preferably 0.5 +/-0.1 mm; continuously shooting a slit light band photo between the lower edge of the shading baffle and the upper surface of the wooden plate by the camera, and transmitting the photo to a computer for identification processing; when the rear edge of the wooden plate leaves the shading baffle, the position sensor is triggered again, and the laser ranging sensor and the camera stop working.
According to the invention, after the detected plate reaches the shading baffle, the distance between the shading baffle and the detected plate can be adjusted in real time according to the data measured by the laser ranging sensor, usually, the distance is always kept at a set value of 0.5 +/-0.1 mm, so that a camera can shoot a light band with a proper width, and the computer can conveniently recognize and process the light band.
The structure of braced frame 15 specifically can be gantry structure, and at this moment, servo motor 16's quantity is two, and two servo motor are located the stand of gantry structure left and right sides respectively, and two servo motor are connected with the left and right sides of shading baffle 2 through the lead screw respectively, and the quantity of laser range finding sensor 19 is two, and two laser range finding sensors are located the left and right sides of shading baffle 2 bottom.
Through setting up laser range finding sensor, servo motor and the lead screw in the left and right sides respectively, can be so that the highly uniform of shading baffle lower limb left and right sides, guarantee that the width of light band is unanimous.
The camera bellows 5 of the invention comprises a light source box 20 and a detection box 21 which are arranged at two sides of a shading baffle 2, a linear light source 3 is arranged in the light source box 20, the inner wall of the detection box 21 is pasted with non-reflective materials to prevent interference caused by reflection, the lens of a camera 4 is arranged in the detection box 21, the number of the cameras 4 is two, the viewing fields of the two cameras cover the whole gap area, and the camera is preferably a high-speed industrial camera, and the frame rate is more than 200 fps.
The thickness of the lower edge of the light-shielding baffle 2 is preferably 0.5mm, and the distance between the lower edge of the light-shielding baffle 2 and the upper surface of the wooden plate 17 is controlled to be 0.5 +/-0.1 mm, so that a light band with a proper width can be obtained.
The position sensor 18 is preferably an electro-optical switch, and the position sensor 18 is preferably disposed on the base 6 below the light-shielding shutter 2, and can accurately detect the presence and absence of the wooden board.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The pit defect detection device for the surface of the wooden board is characterized by comprising a horizontal conveying table, a shading baffle plate with adjustable height is vertically arranged above the conveying table, a line light source is arranged on one side of the shading baffle plate, a camera is arranged on the other side of the shading baffle plate, the light emitting direction of the line light source faces the bottom of the shading baffle plate, the line light source and a lens of the camera are arranged in a dark box, and the camera is connected with a computer.
2. The apparatus according to claim 1, wherein the transfer table comprises a base, the base is provided with a transfer belt, a driving shaft and a driven shaft are respectively arranged at the front end and the rear end of the transfer belt, and the driving shaft is connected with a driving motor; the base is provided with panel guider on the left and right sides.
3. The apparatus according to claim 2, wherein the number of the conveyor belts is plural, a plurality of the conveyor belts are arranged in parallel side by side, a conveyor belt lining plate is arranged on a base, a control cabinet is arranged at the bottom of the base, and the driving motor is arranged on a leg of the base.
4. The apparatus according to claim 2, wherein a vertical support frame is provided on the base, the light blocking plate is provided in the support frame, a servo motor for controlling the light blocking plate to move up and down is provided on the support frame, and the servo motor is connected to the light blocking plate through a lead screw.
5. The apparatus according to claim 4, wherein a position sensor for detecting the position of the wood board is provided on the base at the supporting frame or on the supporting frame, a laser distance measuring sensor for measuring the distance between the lower edge of the light-shielding plate and the upper surface of the wood board is provided at the bottom of the light-shielding plate, and the position sensor, the laser distance measuring sensor and the servo motor are connected to the controller.
6. The apparatus according to claim 5, wherein the support frame is a gantry structure, the number of the servo motors is two, two servo motors are respectively disposed on the columns on the left and right sides of the gantry structure, the two servo motors are respectively connected to the left and right sides of the light-shielding shutter through screws, the number of the laser ranging sensors is two, and the two laser ranging sensors are disposed on the left and right sides of the bottom of the light-shielding shutter.
7. The apparatus of claim 5, wherein the camera chamber comprises a light source chamber and a detection chamber disposed at both sides of the light blocking plate, the line light source is disposed in the light source chamber, a non-reflective material is attached to an inner wall of the detection chamber, and the number of the cameras is two.
8. The apparatus according to claim 5, wherein the thickness of the lower edge of the light-shielding shutter is 0.5mm, and the distance between the lower edge of the light-shielding shutter and the upper surface of the wooden board is controlled to be 0.5 ± 0.1 mm.
9. A device for detecting a pit defect in a surface of a wooden board as defined in any one of claims 5 to 8, wherein said position sensor is an opto-electronic switch, and said position sensor is provided on said base below said light-shielding shutter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010271799.3A CN111307824B (en) | 2020-04-08 | 2020-04-08 | Pit defect detection device on surface of wooden board |
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| CN202010271799.3A CN111307824B (en) | 2020-04-08 | 2020-04-08 | Pit defect detection device on surface of wooden board |
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| CN111307824A true CN111307824A (en) | 2020-06-19 |
| CN111307824B CN111307824B (en) | 2023-03-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112986128A (en) * | 2021-03-19 | 2021-06-18 | 义乌市秋柔贸易有限公司 | Timber surface quality check out test set |
| CN113311007A (en) * | 2021-05-27 | 2021-08-27 | 中山市大自然木业有限公司 | Moisture detection device and method for wood |
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