CN207516267U - A kind of board surface defect double-side detecting device - Google Patents

Abstract

The utility model discloses a double-sided detection device for surface defects of boards. The defect detection device includes a board feeding transmission mechanism, a board output transmission mechanism, a board turning device, a detection control unit and a host computer, a board feeding transmission mechanism and a board output transmission mechanism. A gap is reserved between the mechanisms for installing the turnover device and is located on both sides of the rotation direction of the turnover device, and a first infrared sensor and a first image acquisition device are respectively arranged directly above the entrance of the board feeding mechanism , a second infrared sensor and a second image acquisition device are respectively arranged directly above the exit of the plate output conveying mechanism. The detection device of the utility model can quickly detect the front and back sides of the board and process the defects existing in the board, thereby realizing the purpose of high-speed, high-quality production and timely detection of defects on the surface of the board, and the error is small and the operation is easy .

Description

A double-sided detection device for sheet surface defects

technical field

The utility model relates to the technical field of wood processing equipment and detection, in particular to a double-sided detection device for board surface defects.

Background technique

Defects on the surface of the board mainly rely on manual visual inspection. Inspectors use visual inspection methods to inspect the board under incandescent lamps. Insect eyes, knots, corrosion and other defects are evaluated. This manual detection method not only has a large detection error but is also easily affected by personal factors. The detection standards are often inconsistent among various detection personnel, which will cause the detection results to vary from person to person. , The phenomenon of missed inspection is unavoidable, resulting in uneven quality of the surface of the board, low detection efficiency, high labor intensity, and working under the strong light of incandescent lamps for a long time, which is a great harm to the eyes of the inspectors, especially for the inspectors. When the front and back sides of the board are inspected, it takes a lot of manpower to manually turn the board over for inspection, which increases the production cost of the board. With the advancement and development of science and technology, this manual detection method cannot meet the needs of industrial production of plates. It is necessary to learn from the improvement experience in related fields for technological transformation and industrial upgrading to improve the production and detection efficiency of plates.

Utility model content

The purpose of this utility model is to provide a double-sided detection device and detection method for surface defects of a plate. According to the detection device of the present invention, the front and back sides of the plate can be flipped and detected quickly and the defects existing in the plate can be processed, thereby The purpose of high-speed and high-quality production is realized, and the defects on the surface of the plate are detected in time, and the error is small, and the operation is easy. The measurement process is relatively simple, convenient, convenient and flexible. In order to achieve the above object, the utility model adopts the following technical solutions:

According to one aspect of the present invention, a double-sided detection device for sheet surface defects is provided. The defect detection device includes a plate feeding and conveying mechanism, a plate output conveying There is a gap reserved between the plate delivery mechanism and the plate delivery mechanism for installing the panel turnover device and is located on both sides of the rotation direction of the panel turnover device. An infrared sensor and a first image acquisition device are respectively provided with a second infrared sensor and a second image acquisition device directly above the exit of the board-out conveying mechanism, and at the end opposite to the entrance of the board-feeding conveying mechanism. A buffer baffle is provided, and a third infrared sensor is arranged on the buffer baffle, the acquisition output end of the first infrared sensor, the acquisition output end of the first image acquisition device, the acquisition output end of the second infrared sensor, the third The acquisition output end of the infrared sensor and the acquisition output end of the second image acquisition device are respectively electrically connected to the acquisition input end of the detection control unit, and the output end of the detection control unit is communicatively connected to the host computer. The detection control unit uses a DSP processor to store, analyze and process the images collected by the infrared sensor and the image acquisition device, and controls the rotation of the motor through the PLC controller and the motor control circuit.

Preferably, the plate feeding mechanism includes a first gantry support, a first stepping motor, and a plurality of conveying rollers that are parallel to each other and transversely bridged and fixed between the inner sides of the first gantry support, and the buffer baffle and The conveying rollers are parallel to each other, and a first cross bar is arranged in the center of the top of the first gantry support, one end of the first cross bar is fixedly connected with the middle part of the top cross beam of the first gantry support, and the other end of the first cross bar is One end extends along the entrance direction of the first gantry support and is fixedly connected to the first infrared sensor. A first slide rail is arranged in the top beam of the first gantry support, and the first stepping motor is fixed on the first The outer side of the top beam of the gantry support, the output shaft of the first stepper motor is connected with the first slide rail, and the first vertically downward suspension rod is arranged on the first slide rail to fix the first slide rail. Image acquisition device;

The plate output conveying mechanism includes a second gantry support, a second stepping motor, and a plurality of conveyor belts that are parallel to each other and transversely bridged and fixed between the inner sides of the second gantry support, and are arranged in the center of the top of the second gantry support There is a second cross bar, one end of the second cross bar is fixedly connected with the middle part of the top cross beam of the second gantry support, and the other end of the second cross bar is fixedly connected with the second infrared sensor after extending along the direction of the flap device , a second slide rail is arranged in the top beam of the second gantry bracket, the second stepper motor is fixed on the outside of the top beam of the second gantry bracket, the output shaft of the second stepper motor is connected to the The second slide rail is connected, and a vertically downward second suspension rod is arranged on the second slide rail to fix the second image acquisition device;

The turnover device includes a third stepping motor, a central drive shaft arranged in the gap space between the conveying roller and the conveyor belt, and a plurality of support discs fixed coaxially through the central drive shaft, around each support disc A plurality of rotating arms are evenly distributed and fixed on the disk surface, and the third stepping motor is connected with the drive shaft of the central drive shaft. The conveying rollers and the conveying belts are located on the same axis, and each rotating arm performs overturning movement in the gap between adjacent conveying rollers and in the gap between adjacent conveying belts.

Preferably, the number of the rotating arms is the same as the number of the conveyor belts, the conveying direction of the conveyor belts is the same as that of the rotating arms, and the conveying direction of the conveying rollers is perpendicular to the conveying direction of the conveyor belts.

Preferably, a holding portion perpendicular to the rotating arm is provided at the end of the rotating arm, and flexible supports are detachably provided at both ends of the holding portion.

In the above solution, it is further preferred that the holding part is an arc-shaped metal support part, and the flexible support part is spherical or hemispherical.

In the above solution, it is further preferred that the flexible support member is spherical, and the flexible support member is rotatably connected with the holding part.

In the above scheme, it is further preferred that the flexible support member is unglue.

In the above solution, it is further preferred that the first image acquisition device and the second image acquisition device use laser scanners, CMOS image sensors or CCD image sensors.

In the above solution, it is further preferred that LED dimming lamps are respectively provided on the first crossbar and the second crossbar.

In summary, the above-mentioned technical scheme adopted by the utility model, the utility model has the following remarkable effects:

According to the detection device of the utility model, it is possible to quickly flip over and detect the two sides of the board and deal with the defects existing in the board, thereby realizing the detection of the defects on the front and back sides of the board under dynamic conditions, thereby realizing the high-speed, The purpose of high-quality production; the faster the detection speed of the utility model, the higher the sensitivity, and the defect detection and evaluation of the plate can be carried out; the utility model adopts a laser scanner to realize the defect scanning of the surface of the solid wood plate by using a double-sided detection device for the surface defect of the plate. There is no damage to the surface of the solid board, the detection and operation are simple, the adjustment is convenient, and it can also meet the inspection requirements of different inspection standards. It has a wide range of applications, good applicability, and has a good market prospect.

Description of drawings

Fig. 1 is a structural schematic diagram of a double-sided detection device for surface defects of a plate of the present invention;

Fig. 2 is a schematic structural view of the plate feeding mechanism of the present invention

Fig. 3 is a schematic structural view of the plate delivery mechanism of the present invention;

Fig. 4 is a front view of the panel turning device of the present invention;

In the accompanying drawings, 1-board delivery mechanism, 2-board delivery mechanism, 3-turnover device, 4-first infrared sensor, 5-second infrared sensor, 6-first image acquisition device, 7-second Image acquisition device, 8-third stepping motor, 9-drive motor, 10-detection control unit, 11-host computer, 12-buffer baffle, 13-third infrared sensor, 100-first gantry support, 101- Conveyor roller, 102-first crossbar, 103-first slide rail, 104-first stepping motor, 105-first suspension rod, 200-second gantry support, 201-conveyor belt, 202-second crossbar, 203-the second slide rail, 204-the second stepper motor, 205-the second suspension rod, 300-central drive shaft, 301-support plate, 302-rotary arm, 303-holding part, 304-holding part, 1000-plate to be tested.

Detailed ways

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the drawings and preferred embodiments. However, it should be noted that many details listed in the specification are only for readers to have a thorough understanding of one or more aspects of the present invention, and these aspects of the present invention can be realized even without these specific details.

As shown in Figure 1, according to a double-sided detection device for surface defects of boards according to the present invention, the defect detection device includes a board feeding conveying mechanism 1, a board discharging conveying mechanism 2, a plate turning device 3, a detection control unit 10 and an upper Machine 11, there is a gap space reserved between the board feeding mechanism 1 and the board delivery mechanism 2 for installing the flipping device 3 and located on both sides of the turning direction of the flipping device 3. A first infrared sensor 4 and a first image acquisition device 6 are respectively arranged directly above the entrance of the mechanism 1, and a second infrared sensor 5 and a second image acquisition device are respectively arranged directly above the exit of the board-out conveying mechanism 2. Acquisition device 7 is also provided with a buffer baffle 12 at an end relative to the entrance of the plate delivery mechanism 1, and a third infrared sensor 13 is arranged on the buffer baffle, and the collection output end of the first infrared sensor 4, The acquisition output end of the first image acquisition device 6, the acquisition output end of the second infrared sensor 5, the acquisition output end of the third infrared sensor 13 and the acquisition output end of the second image acquisition device 7 are respectively connected with the detection control unit 10. The acquisition input end is electrically connected, the output end of the detection control unit 10 is connected to the host computer 11 in communication, and the first image acquisition device 6 and the second image acquisition device 7 adopt a laser scanner, a CMOS image sensor or a CCD image sensor. Sensors are also provided with LED dimming lights on the first crossbar 102 and the second crossbar 202 respectively. When scanning with a laser scanner, LEDs can be used to illuminate the surface of the plate under test at the same time, and the surface of the plate under test For brightness adjustment, due to the lack of light in the detection environment and its instability and time difference, it is easy to be interfered by external factors. Configuring LED dimming lights for supplementary light can eliminate the influence of the light source in the detection environment on the shooting effect.

In the present utility model, as shown in Fig. 1 , Fig. 2 and Fig. 3 , the plate feeding mechanism 1 includes a first gantry bracket 100, a first stepping motor 104, and a plurality of parallel and laterally bridged and fixed The conveying rollers 101 between the inner sides of the first gantry support 100, each conveying roller is connected by a chain transmission and then connected with a drive motor (not shown), so that the plate is transferred to the turning device 3, and the buffer The baffle plate 12 and the conveying roller 101 are parallel to each other, and a first cross bar 102 is arranged in the center of the top of the first gantry support 100 , and one end of the first cross bar 102 is fixedly connected to the middle part of the top cross beam of the first gantry support 100 , the other end of the first crossbar 102 is fixedly connected to the first infrared sensor 4 after extending along the entrance direction of the first gantry support 100 , and a first slide rail 103 is arranged in the top crossbeam of the first gantry support 100 , the first stepper motor 104 is fixed on the outside of the top beam of the first gantry bracket 100, the output shaft of the first stepper motor 104 is connected with the first slide rail 103, and The rail 103 is provided with a vertically downward first suspension rod 105 to fix the first image acquisition device 6; thus the first stepper motor 104 drives the first slide rail 103 to go back and forth in the top beam of the first gantry support 100 Swipe to measure, thereby reducing the problem of under-detection of the plate boundary. The plate-out conveying mechanism 2 includes a second gantry support 200, a second stepping motor 204, and a plurality of conveyor belts 201 parallel to each other and horizontally bridged and fixed between the inner sides of the second gantry support 200, and between each conveyor belt After being connected by chain transmission, it is connected with the drive motor 9, so that the plate is transferred to the turning device 3. A second crossbar 202 is arranged in the center of the top of the second gantry support 200. One end of the second crossbar 202 is connected to The middle part of the top beam of the second gantry support 200 is fixedly connected, and the other end of the second cross bar 202 is fixedly connected with the second infrared sensor 5 after extending along the direction of the turnover device 3 . A second slide rail 203 is arranged inside, and the second stepper motor 204 is fixed on the outer side of the top beam of the second gantry support 200 , the output shaft of the second stepper motor 204 is connected to the second slide rail 203 connected, on the second slide rail 203 is provided with a vertically downward second suspension rod 205 to fix the second image acquisition device 7, so that the second stepper motor 204 drives the second slide rail 203 in the second The top beam of the gantry support 200 slides back and forth for measurement, thereby reducing the problem of insufficient plate boundary detection; before the image scanning detection, the infrared sensor is used to detect the position where the plate is conveyed, and the laser scanner is started after positioning through the infrared sensor This reduces the working time of the laser scanner, ensures that the laser scanner scans in a relatively stable state after detection and positioning, reduces the processing of scanned image data, and improves the efficiency of detection.

In the present utility model, as shown in FIGS. 1 and 4 , the turnover device 3 includes a third stepping motor 8, a central drive shaft 300 arranged in the gap space between the conveying roller 101 and the conveyor belt 201 and driven through the center. The shaft 3 is coaxially fixed with a plurality of support discs 301, and a plurality of rotating arms 302 are evenly distributed and fixed on the surrounding disc surface of each support disc, so that the third stepper motor 8 is connected to the central drive shaft 3 through transmission. The horizontal plane where the conveying roller 101 is located and the horizontal plane where the conveying belt 201 is located are vertically in the same plane, and each corresponding conveying roller 101 and conveying belt 201 are located on the same axis with each other, and the conveying direction of the conveying belt 201 is the same as that of the conveying belt 201. The rotation direction of the rotating arms 302 is the same, the number of the rotating arms 302 is the same as the number of the conveying belts 201, the conveying direction of the conveying rollers 101 is perpendicular to the conveying direction of the conveying belts 201, and each rotating arm 302 is on the adjacent conveying In the gap between the rollers 101 and in the gap between the adjacent conveyor belts 201, the overturning movement is performed, so that the measured plate is sent from the conveying roller 100 to the rotating arm 302, turned over by 180°, and then conveyed to the conveyor belt 201 for another Surface detection, the plate is taken out from the conveyor belt 201 after the detection is completed, so as to sort the tested qualified or unqualified plates; the end of the rotating arm 302 is provided with a holding part 303 perpendicular to the rotating arm 302, Flexible support members 304 are detachably disposed at both ends of the holding portion 303 . The supporting part 303 is an arc-shaped metal supporting part, and the flexible supporting part 304 is spherical or hemispherical; the flexible supporting part 304 is spherical, and the flexible supporting part 304 is connected with the supporting part 303 in rotation. The flexible support in the utility model is preferably hemispherical. When the lifting part 303 lifts the plate to be tested from the conveying roller 101, it is easy to slide freely, and it will scratch the surface of the plate to be tested. Therefore, the hemispherical flexible support is adopted. The planar part supports the plate under test, and the flexible supporting member 304 is Urex glue, so as to effectively prevent the plate under test from slipping and losing the surface of the plate under test.

In the present utility model, with reference to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, during the detection of the flap, the front conveying roller 101 transports the plate to be tested to the first infrared sensor 4 and the first image acquisition device 6 for frontal defect detection, the plate turning device 3 is driven by the third stepping motor 13 on the plate, and the rotating arm 302 provided on the central drive shaft 300 rotates together, and the rotating arm 302 turns the plate to be tested on the conveying roller 101 Unloaded, the swivel arm 302 drives the measured plate to move toward the plate delivery mechanism 2; because there is a gap between the adjacent conveyor rollers 101 and the adjacent conveyor belts 201, the swivel arm 302 will not be in contact with the conveyor roller 1 and the conveyor belt. When a collision or interference occurs, when the fan-shaped opening between two adjacent groups of rotating arms 302 is aligned with the conveying roller 201, the conveying roller 201 stops conveying, and the plate under test continues to be transported into the support range of the rotating arm 302. The three-stepping motor 8 continues to start, the plate to be tested is held up by the rotating arm 302, and as the rotating arm 302 rotates 180°, it reaches the top of the conveyor belt 201 and falls on the plane where the conveyor belt 201 is located, and then the central drive shaft 300 stops running. The conveyor belt 201 transports the plate to be tested to the scanning working range of the second infrared sensor 5 and the second image acquisition device 7, and at the same time, the plate feeding and conveying mechanism 1 on the other side enters the plate and starts scanning, and the rotating arm 302 continues to rotate to carry out the copying operation. Work cycle.

Combining Figures 1 to 4, a defect detection process of a double-sided panel of the present invention is carried out according to the following steps:

Step 1: Send the plate 1000 to be tested smoothly into the inlet end of the conveying roller 101, the first infrared sensor 4 detects whether the plate 1000 to be tested enters the detection area, and then starts the first image acquisition device 6 on the top of the first gantry support 100 One end starts to move back and forth to the other end to take pictures of the surface of the plate to obtain images of the surface of the plate;

Step 2: As the plate 1000 is completely fed into the conveying roller 101, the plate 1000 is picked up by the rotating arm 302 during the rotation process, and then the rotating arm 302 rotates 180° to turn the plate 1000 over and transfer it to the conveyor belt 201;

Step 3: Send the plate 100 along the conveying direction of the conveyor belt 201 to the second infrared sensor 5 to detect whether the plate 1000 under test enters the detection area, then start the second image acquisition device 7 at one end on the top of the second gantry support 200 to start back and forth to the other end Take pictures of the surface of the plate in motion to obtain the image of the other surface of the plate;

Step 4: Send the image of the surface of the board acquired by the first image acquisition device 6 and the image of the other surface of the board acquired by the second image acquisition device 7 into the detection control unit 10 for storage, and then upload to the host computer 11 for image recognition and image recognition. Display processing; the image recognition is carried out according to the following steps, and the obtained plate surface image is subjected to noise filtering processing, and then the image is divided into n point cloud objects, and image brightness feature extraction is performed on the divided point cloud objects and each point is searched Defects in cloud objects; Gamma transformation is performed on the image after brightness feature extraction to enhance the image contrast to further determine the defect level, and to eliminate the color intensity, ambient light or shadow in the image scanning process by dividing the image into n point cloud objects As a result, the scanned image has been further refined, which improves the precision and accuracy of the defect detection on the surface of the plate; the defect level does not exceed 0.3mm, and the plate with a defect exceeding 0.3mm is confirmed to be unqualified. Elimination, the image recognition is not limited to holes, scratches, dents, creases, cracks, bug holes, knots, corrosion, stains, color, texture and color defects for identification and detection.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present utility model.

Claims (9)

1. A double-sided detection device for surface defects of boards, characterized in that: the defect detection device includes a board delivery mechanism, a board delivery mechanism, a plate turning device, a detection control unit and a host computer, and the board delivery mechanism and There is a gap reserved between the plate-out conveying mechanism for installing the plate-turning device and is located on both sides of the rotating direction of the plate-turning device, and the first infrared sensor and the The first image acquisition device is provided with a second infrared sensor and a second image acquisition device directly above the exit of the plate delivery mechanism, and a buffer stop is provided at the end opposite to the entrance of the plate delivery mechanism plate, the buffer baffle is provided with a third infrared sensor, the acquisition output end of the first infrared sensor, the acquisition output end of the first image acquisition device, the acquisition output end of the second infrared sensor, the acquisition output end of the third infrared sensor The output end and the acquisition output end of the second image acquisition device are respectively electrically connected to the acquisition input end of the detection control unit, and the output end of the detection control unit is communicatively connected to the host computer. 2. A double-sided detection device for sheet surface defects according to claim 1, characterized in that: the sheet feeding mechanism includes a first gantry support, a first stepping motor, and a plurality of parallel and transversely fixed The conveying roller between the inner sides of the first gantry bracket, the buffer baffle and the conveying roller are parallel to each other, and a first cross bar is arranged at the center of the top of the first gantry support, and one end of the first cross bar It is fixedly connected with the middle part of the top crossbeam of the first gantry support, and the other end of the first crossbar extends along the entrance direction of the first gantry support and is fixedly connected with the first infrared sensor, inside the top crossbeam of the first gantry support A first slide rail is provided, the first stepping motor is fixed on the outside of the top beam of the first gantry bracket, the output shaft of the first stepping motor is connected with the first slide rail, and the first stepping motor is connected to the first slide rail. A slide rail is provided with a vertically downward first suspension rod to fix the first image acquisition device; The plate output conveying mechanism includes a second gantry support, a second stepping motor, and a plurality of conveyor belts that are parallel to each other and transversely bridged and fixed between the inner sides of the second gantry support, and are arranged in the center of the top of the second gantry support There is a second cross bar, one end of the second cross bar is fixedly connected with the middle part of the top cross beam of the second gantry support, and the other end of the second cross bar is fixedly connected with the second infrared sensor after extending along the direction of the flap device , a second slide rail is arranged in the top beam of the second gantry bracket, the second stepper motor is fixed on the outside of the top beam of the second gantry bracket, the output shaft of the second stepper motor is connected to the The second slide rail is connected, and a vertically downward second suspension rod is arranged on the second slide rail to fix the second image acquisition device; The turnover device includes a third stepping motor, a central drive shaft arranged in the gap between the conveying roller and the conveyor belt, and a plurality of support discs fixed coaxially through the central drive shaft, and the disc surface around each support disc A plurality of rotating arms are evenly distributed and fixed on the top, and the third stepping motor is connected to the central drive shaft. The conveying rollers and the conveying belts are located on the same axis, and each rotating arm performs overturning motion in the gap between adjacent conveying rollers and in the gap between adjacent conveying belts. 3. A double-sided detection device for sheet surface defects according to claim 2, characterized in that: the number of the rotating arms is the same as the number of conveyor belts, and the conveying direction of the conveyor belts is the same as that of the rotating arms , the conveying direction of the conveying rollers is perpendicular to the conveying direction of the conveyor belt. 4. A double-sided detection device for surface defects of a plate according to claim 3, characterized in that: a holding portion perpendicular to the rotating arm is provided at the end of the rotating arm, and the two ends of the holding portion can be A flexible support is detachably provided. 5 . The double-sided inspection device for surface defects of sheet materials according to claim 4 , wherein the holding part is an arc-shaped metal support part, and the flexible support part is spherical or hemispherical. 6 . 6 . The device for detecting surface defects on both sides of a plate according to claim 5 , wherein the flexible supporting member is spherical, and the flexible supporting member is rotatably connected to the holding portion. 7 . 7. A double-sided detection device for surface defects of boards according to claim 4 or 5, characterized in that: the flexible support is Urex glue. 8 . The double-sided inspection device for surface defects of sheet materials according to claim 2 , wherein the first image acquisition device and the second image acquisition device are laser scanners, CMOS image sensors or CCD image sensors. 9 . The double-sided inspection device for surface defects of boards according to claim 2 , wherein LED dimming lights are respectively provided on the first crossbar and the second crossbar. 10 .