A device and method for detecting surface defects of lath-shaped steel

Abstract

The present invention discloses a surface defect detection device for strip-shaped steel, comprising a frame, a conveyor roller installed on the frame, two groups of pressing mechanisms and two detection seats, wherein an empty space where no conveyor roller is installed is provided in the middle of the conveyor roller, the two groups of pressing mechanisms press the steel to be detected on the conveyor roller and are respectively located in front of and behind the empty space, the two detection seats are respectively located above and below the empty space, each detection seat is connected to the frame through a transverse mechanism, and a distance sensor and an image acquisition head corresponding to the steel to be detected are provided on the detection seat. The present invention also provides a defect detection method. The present invention utilizes the distance sensor and the image acquisition head to automatically detect defects on the upper and lower surfaces of the strip-shaped steel at the same time, which not only greatly improves the detection efficiency and reduces the labor intensity of the detection personnel, but also eliminates the influence of human factors and improves the detection accuracy, thereby ensuring the surface quality of the strip-shaped steel.

Description

Technical Field

[0001] The invention relates to a device and a detection method for detecting surface defects of strip-shaped steel materials, belonging to the technical field of detection. Background Art

[0002] At present, special materials are widely used in various fields, mainly including mold steel, valve steel, special alloys and other products. Scientific detection methods are an important condition to ensure product quality. At present, the production site mainly uses visual inspection to detect the surface defects of lath-shaped steel, which not only increases the labor intensity of workers, but also has low detection accuracy, which seriously affects the surface quality of products. Therefore, it is very necessary to design a lath-shaped steel surface defect detection device and detection method. Summary of the invention

[0003] The purpose of the present invention is to provide a surface defect detection device and method for plate-shaped steel materials in view of the drawbacks of the prior art, so as to reduce the labor intensity of detection personnel and improve the surface quality of plate-shaped steel materials.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] A device for detecting surface defects of strip-shaped steel materials comprises a frame, a conveyor roller mounted on the frame, two sets of pressing mechanisms and two detection seats, wherein an empty zone where no conveyor roller is installed is provided in the middle of the conveyor roller, the two sets of pressing mechanisms press the inspected steel materials on the conveyor roller and are respectively located in front of and behind the empty zone, the two detection seats are respectively located above and below the empty zone, each detection seat is connected to the frame via a transverse movement mechanism, and a distance measuring sensor and an image acquisition head corresponding to the inspected steel materials are provided on the detection seat.

[0006] The above-mentioned strip-shaped steel surface defect detection device, the pressing mechanism includes two supports and multiple pressing rollers, the two supports are respectively located on both sides of the top of the frame and are connected to the top of the frame through a vertical electric telescopic rod, and the multiple pressing rollers are pressed on the steel to be inspected and installed between the two supports.

[0007] The above-mentioned strip-shaped steel surface defect detection device, the transverse movement mechanism includes two support rods and a screw rod and two sliding rods corresponding to each detection seat, the two support rods are respectively fixed on both sides of the frame, the two sliding rods are parallel to each other and slide through the corresponding detection seat, the two ends of each sliding rod are respectively connected to the two support rods, the screw rod is parallel to the two sliding rods and is threadedly matched with the through screw hole on the detection seat, and one end of the screw rod is connected to the motor fixed on the support rod.

[0008] The above-mentioned strip-shaped steel surface defect detection device also includes a steel guiding device, which includes two fixed plates, two limit plates and multiple guide rollers, the two fixed plates are respectively connected to the two sides of the bottom plate of the frame, the two limit plates are respectively located above the two sides of the conveying roller, and the multiple guide rollers are divided into two groups. The two groups of guide rollers are respectively in contact with the two side edges of the inspected steel, and each guide roller passes through the gap between the conveying rollers in the conveying roller. The upper end of the guide roller is rotatably connected to the limit plate on the corresponding side, and the lower end is rotatably connected to the fixed plate on the corresponding side.

[0009] The above-mentioned strip-shaped steel surface defect detection device, the two fixed plates are connected to the bottom plate of the frame through a guide roller spacing adjustment mechanism, the guide roller spacing adjustment mechanism includes a hydraulic cylinder, an adjusting rod, two movable seats and four connecting rods, the tops of the two movable seats are respectively fixedly connected to the two fixed plates, and the bottoms are slidably connected to the bottom plate through transverse slide grooves arranged on the bottom plate, the adjusting rod is located between the two movable seats and is slidably connected to the bottom plate through longitudinal slide grooves arranged on the bottom plate, the hydraulic cylinder is fixed to the end of the bottom plate, the piston rod of the hydraulic cylinder is connected to the adjusting rod, the four connecting rods are symmetrically arranged on both sides of the adjusting rod and the two connecting rods on the same side are parallel to each other, one end of each connecting rod is hinged to the adjusting rod, and the other end is hinged to the movable seat on the same side.

[0010] In the above-mentioned strip-shaped steel surface defect detection device, the position of the limit plate close to the slide rod is connected to a distance sensor corresponding to the detection seat, and the signal output end of the distance sensor is electrically connected to the controller of the motor at one end of the screw rod.

[0011] In the above-mentioned strip-shaped steel surface defect detection device, the support rod is arranged on the side of the limit plate away from the detection seat, and the limit plate and the movable seat are both provided with a first through hole matching the screw rod and a second through hole matching the slide rod.

[0012] The above-mentioned strip-shaped steel surface defect detection device has a protective frame connected to the frame provided above the frame.

[0013] In the above-mentioned strip-shaped steel surface defect detection device, top guide blocks are provided on the upper parts of both ends of the limit plate, and a top guide groove matching the top guide block is provided on the bottom of the top plate of the protective frame.

[0014] A method for detecting surface defects of a lath-shaped steel material, the method comprising the following steps:

[0015] a. Place the steel to be tested at the input end of the conveyor roller;

[0016] b. Start the hydraulic cylinder to drive the adjusting rod to move through the longitudinal slide. The adjusting rod adjusts the distance between the two moving seats through the connecting rod, so that the two sets of guide rollers are in contact with the two sides of the steel being tested;

[0017] c. Adjust the height of the support through the electric telescopic rod so that the pressing roller contacts the upper surface of the steel;

[0018] d. Start the conveyor roller and the pressing roller, and after the area on the steel that needs to be inspected is conveyed to the empty area, close the conveyor roller and the pressing roller, and stop conveying the steel;

[0019] e. Start the motor at one end of the screw rod, the screw rod rotates and drives the detection seat to move laterally along the slide rod (20), the image acquisition head acquires an image of the detection area, and the distance sensor detects the distance between the upper and lower surfaces of the steel and the distance sensor;

[0020] f. After the detection seat moves to the position of the limit plate, the distance sensor sends an in-position signal to the controller, and the controller stops the motor at one end of the screw rod to complete the detection of this area;

[0021] g. Repeat steps d to f to inspect the next area that needs to be inspected.

[0022] The present invention utilizes a distance measuring sensor and an image acquisition head to automatically detect defects on the upper and lower surfaces of the strip-shaped steel material at the same time, which not only greatly improves the detection efficiency and reduces the labor intensity of the detection personnel, but also eliminates the influence of human factors and improves the detection accuracy, thereby ensuring the surface quality of the strip-shaped steel material. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the top of the conveying roller table in the present invention;

[0026] Figure 3 It is a schematic diagram of the local structure of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the guide roller spacing adjustment mechanism in the present invention.

[0028] The numbers in the figure are: 11, frame; 12, support leg; 13, conveyor roller; 14, electric telescopic rod; 15, support; 16, pressing roller; 17, protective frame; 18, support rod; 19, screw rod; 20, slide rod; 21, detection seat; 22, distance sensor; 23, image acquisition head; 24, guide roller; 25, limit plate; 26, top guide block; 27, first through hole; 28, second through hole; 29, distance sensor; 30, fixed plate; 31, movable seat; 32, bottom plate; 33, guide roller spacing adjustment mechanism; 34, horizontal slide groove; 35, connecting rod; 36, first articulated seat; 37, adjustment rod; 38, second articulated seat; 39, longitudinal slide groove; 40, piston rod; 41, hydraulic cylinder. DETAILED DESCRIPTION

[0029] See also Figure 1-Figure 4 In an embodiment of the present invention, a strip-shaped steel surface defect detection device includes a frame 11, a support leg 12 connected to the bottom of the frame 11, and a conveyor roller 13 installed on the frame 11, and the top of the frame 11 is connected to a protective frame 17;

[0030] The top of the conveying roller 13 is provided with two sets of pressing mechanisms with adjustable heights for contacting the upper surface of the steel being conveyed;

[0031] The setting of the pressing mechanism can limit the upper surface of the steel during transportation, reduce the shaking during the steel transportation process, and the height of the pressing mechanism can be adjusted, which is convenient for actual adjustment according to the thickness of the steel;

[0032] The conveying roller 13 is provided with a detection seat 21 at the top and bottom, and a spaced area corresponding to the detection seat 21 is provided on the conveying roller 13. A distance sensor 22 and an image acquisition head 23 are connected to the side where the two detection seats 21 are close to each other. The detection seats 21 are connected with a transverse movement mechanism for adjusting the horizontal position of the detection seats 21.

[0033] The distance sensor 22 can detect the distance between the upper surface of the steel and the distance sensor 22. The image acquisition head 23 acquires images of the detection area to realize the acquisition of surface defect data of the steel. If the distance between each point in the horizontal position of a detection area and the distance sensor 22 exceeds the threshold, the surface flatness of the steel does not meet the standard. The image acquisition head 23 acquires image data to facilitate subsequent observation and comparison by personnel to see if there are defects. In the present invention, the distance sensor 22 is a laser detector.

[0034] Two groups of guide rollers 24 are provided on the top of the conveying roller 13, which are in contact with the two sides of the steel respectively. Each group includes a plurality of guide rollers 24. A limit plate 25 is connected to the top of each group of guide rollers 24, and the bottom is connected to a moving seat 31 through a fixed plate 30. The lower ends of the four legs 12 of the frame 11 are connected to a bottom plate 32. A guide roller spacing adjustment mechanism 33 is provided on the upper part of the bottom plate 32 for adjusting the distance between the two moving seats 31.

[0035] The guide roller 24 can contact the side of the steel. During transportation, the steel will drive the guide roller 24 to rotate, reducing the deviation of the steel when it moves. The guide roller 24 rotates on the side wall of the steel, which can reduce the friction on the steel. The position of the guide roller 24 is easy to adjust according to the width of the steel.

[0036] The pressing mechanism includes two supports 15 and a plurality of pressing rollers 16 installed between the two supports 15. An electric telescopic rod 14 for adjusting the height of the support 15 is installed on the top of the frame 11. The telescopic end of the electric telescopic rod 14 is connected to the bottom of the support 15. The spacer is placed between the two groups of pressing mechanisms. The two groups of pressing mechanisms cooperate, and during the steel conveying process, the pressing rollers 16 can contact the upper surface of the steel and cooperate with the conveying roller 13 to convey the steel to move.

[0037] The transverse movement mechanism includes two support rods 18 and a screw rod 19 installed between the two support rods 18, one group of support rods 18 is equipped with a motor for driving the screw rod 19 to rotate, and two sliding rods 20 parallel to the screw rod 19 are also installed between the two support rods 18. The detection seat 21 is provided with a screw hole that is threadedly matched with the screw rod 19 and a sliding hole that is slidably matched with the sliding rod 20; the motor controls the rotation of the screw rod 19, which can drive the detection seat 21 to move stably horizontally along the sliding rod 20, and the ranging sensor 22 and the image acquisition head 23 perform detection operations.

[0038] A distance sensor 29 for detecting the distance between the detection seat 21 and the support rod 18 is connected to the side of the limit plate 25 close to the slide rod 20, and the distance sensor 29 is electrically connected to the motor through the controller; the cooperation between the limit plate 25 and the distance sensor 29 can limit the horizontal movement position of the detection seat 21. After the detection seat 21 moves to the position of the limit plate 25, the signal of the distance sensor 29 can be sent to the controller to stop the motor from working. After that, the steel continues to be transported and the next detection area is detected.

[0039] The limit plate 25 is provided with a first through hole 27 for the screw rod 19 to pass through and a second through hole 28 for the slide rod 20 to pass through. The support rod 18 is arranged on the side of the limit plate 25 away from the detection seat 21, and the movable seat 31 is also provided with a first through hole 27 and a second through hole 28; so that the limit plate 25 and the movable seat 31 are not affected by the screw rod 19 and the slide rod 20 when adjusting.

[0040] The guide roller 24 passes through the gap between the conveying rollers in the conveying roller 13 . The setting direction of the guide roller 24 is perpendicular to the setting direction of the conveying roller. The top of the guide roller 24 is rotatably connected to the limit plate 25 , and the bottom of the guide roller 24 is rotatably connected to the fixing plate 30 .

[0041] The top of the limiting plate 25 is connected to the top guide block 26, the bottom of the top plate of the protective frame 17 is provided with a top guide groove for the top guide block 26 to slide, the bottom of the movable seat 31 is connected to the bottom guide block, and the top of the bottom plate 32 is provided with a transverse groove 34 for the bottom guide block to slide; when the guide roller spacing adjustment mechanism 33 is working, the top guide block 26 slides in the top guide groove, and the bottom guide block slides in the transverse groove 34.

[0042] The guide roller spacing adjustment mechanism 33 includes a hydraulic cylinder 41 installed on the top of the base plate 32, the power output end of the hydraulic cylinder 41 is connected to the piston rod 40, the end of the piston rod 40 away from the hydraulic cylinder 41 is connected to the adjusting rod 37, two sets of second articulated seats 38 are connected on both sides of the adjusting rod 37, the second articulated seats 38 are articulated to the connecting rod 35, and the end of the connecting rod 35 away from the second articulated seat 38 is articulated to the first articulated seat 36 on one side of the moving seat 31; when the hydraulic cylinder 41 drives the piston rod 40 to extend and retract, the adjusting rod 37 can drive the moving seat 31 to adjust the horizontal position through the connecting rod 35.

[0043] A longitudinal slide groove 39 is provided on the top of the bottom plate 32, and a moving block slidably matched with the longitudinal slide groove 39 is connected to the bottom of the adjusting rod 37; when the adjusting rod 37 moves, the moving block moves in the longitudinal slide groove 39, so that the adjusting rod 37 can perform stable horizontal movement.

[0044] When the present invention is used, the steel to be tested is placed at the input end of the conveyor roller 13, and the height of the support 15 is adjusted by the electric telescopic rod 14, so that the pressing roller 16 contacts the upper surface of the steel. The hydraulic cylinder 41 works to adjust the position of the adjusting rod 37 through the longitudinal slide 39, so that the adjusting rod 37 adjusts the position between the two moving seats 31 through the connecting rod 35, and adjusts the guide roller 24 to contact the side wall of the steel.

[0045] The conveying roller 13 and the pressing roller 16 work to convey the steel. After the position where the steel needs to be detected is conveyed to the empty space, the conveying roller 13 and the pressing roller 16 stop conveying the steel, the motor drives the screw 19 to work, the detection seat 21 can stably move horizontally along the slide bar 20, the image acquisition head 23 collects images of the detection area, and the distance sensor 22 can detect the distance between the upper surface of the steel and the distance sensor 22;

[0046] After the detection seat 21 moves to contact the limit plate 25, the signal of the distance sensor 29 can be sent to the controller, the motor can stop working, and then the steel continues to be transported to the next detection area for detection.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] The setting of the pressing mechanism in the present invention can limit the upper surface of the steel during transportation, reduce the up and down shaking of the steel during transportation, and the height of the pressing mechanism can be adjusted, which is convenient for actual adjustment according to the thickness of the steel.

[0049] In the present invention, the guide roller can contact the side wall of the steel material. When the steel material is being transported, the guide roller will be driven to rotate, thereby reducing the deviation of the steel material during movement. The guide roller rotates on the side wall of the slat-shaped steel material, thereby reducing the friction on the steel material. Moreover, the position of the guide roller can be easily adjusted according to the width of the steel material.

[0050] When the guide roller in the present invention is adjusted, the limit plate can be driven to be adjusted. The cooperation of the limit plate and the distance sensor can limit the horizontal movement position of the detection seat, which is convenient for the detection seat to move within the width range of the steel. The distance sensor can detect the distance between the upper surface of the steel and the distance sensor. The image acquisition head performs image acquisition on the detection area to realize the acquisition of surface defect data of the strip-shaped steel.

Claims

1. A device for detecting surface defects of a strip-shaped steel material, characterized in that: The invention comprises a frame (11), a conveying roller (13) installed on the frame (11), two sets of pressing mechanisms and two detection seats (21), wherein a spaced area where no conveying roller is installed is provided in the middle of the conveying roller (13), the two sets of pressing mechanisms press the steel to be detected on the conveying roller (13) and are respectively located in front of and behind the spaced area, the two detection seats (21) are respectively located above and below the spaced area, each detection seat (21) is connected to the frame (11) via a transverse movement mechanism, and a distance sensor (22) and an image acquisition head (23) corresponding to the steel to be detected are provided on the detection seat (21); The pressing mechanism comprises two supports (15) and a plurality of pressing rollers (16), the two supports (15) being respectively located on both sides of the top of the frame (11) and connected to the top of the frame (11) via a vertical electric telescopic rod (14), and the plurality of pressing rollers (16) being pressed on the steel material to be tested and being installed between the two supports (15); The transverse movement mechanism comprises two support rods (18) and a screw rod (19) and two slide rods (20) corresponding to each detection seat (21). The two support rods (18) are respectively fixed on both sides of the frame (11). The two slide rods (20) are parallel to each other and slide through the corresponding detection seat (21). The two ends of each slide rod (20) are respectively connected to the two support rods (18). The screw rod (19) is parallel to the two slide rods (20) and is threadedly engaged with the through screw hole on the detection seat (21). One end of the screw rod (19) is connected to the motor fixed on the support rod (18). It also includes a steel material guiding device, the steel material guiding device including two fixed plates (30), two limit plates (25) and a plurality of guide rollers (24), the two fixed plates (30) are respectively connected to the two sides of the bottom plate (32) of the frame (11), the two limit plates (25) are respectively located above the two sides of the conveying roller (13), the plurality of guide rollers (24) are divided into two groups, the two groups of guide rollers (24) are respectively in contact with the two side edges of the steel material to be inspected, each guide roller (24) passes through the gap between the conveying rollers in the conveying roller (13), the upper end of the guide roller (24) is rotatably connected to the limit plate (25) on the corresponding side, and the lower end is rotatably connected to the fixed plate (30) on the corresponding side; The two fixed plates (30) are connected to the bottom plate (32) of the frame (11) via a guide roller spacing adjustment mechanism (33). The guide roller spacing adjustment mechanism (33) comprises a hydraulic cylinder (41), an adjustment rod (37), two movable seats (31) and four connecting rods (35). The tops of the two movable seats (31) are respectively fixedly connected to the two fixed plates (30), and the bottoms are slidably connected to the bottom plate (32) via a transverse slide groove (34) provided on the bottom plate (32). The adjustment rod (37) is located between the two movable seats (31). The movable seat (31) is slidably connected to the bottom plate (32) through a longitudinal slide groove (39) arranged on the bottom plate (32); the hydraulic cylinder (41) is fixed to the end of the bottom plate (32); the piston rod (40) of the hydraulic cylinder (41) is connected to the adjustment rod (37); four connecting rods (35) are symmetrically arranged on both sides of the adjustment rod (37) and the two connecting rods (35) on the same side are parallel to each other; one end of each connecting rod (35) is hinged to the adjustment rod (37) and the other end is hinged to the movable seat (31) on the same side.

2. The device for detecting surface defects of strip-shaped steel materials according to claim 1, characterized in that: A distance sensor (29) corresponding to the detection seat (21) is connected to a portion of the limit plate (25) close to the slide rod (20), and a signal output end of the distance sensor (29) is electrically connected to a controller of a motor at one end of the screw rod (19).

3. The device for detecting surface defects of strip-shaped steel materials according to claim 2, characterized in that: The support rod (18) is arranged on a side of the limit plate (25) away from the detection seat (21), and the limit plate (25) and the movable seat (31) are both provided with a first through hole (27) matching the screw rod (19) and a second through hole (28) matching the slide rod (20).

4. The device for detecting surface defects of strip-shaped steel materials according to claim 3, characterized in that: A protection frame (17) connected to the frame (11) is provided above the frame (11).

5. The device for detecting surface defects of strip-shaped steel materials according to claim 4, characterized in that: Top guide blocks (26) are provided at the upper parts of both ends of the limit plate (25), and top guide grooves matching the top guide blocks (26) are provided at the bottom of the top plate of the protection frame (17).

6. A method for detecting surface defects of a strip-shaped steel material using the detection device according to any one of claims 2 to 5, characterized in that: The method comprises the following steps: a. Place the steel to be tested on the input end of the conveyor roller (13); b. Start the hydraulic cylinder (41), drive the adjustment rod (37) to move through the longitudinal slide (39), and the adjustment rod (37) adjusts the distance between the two movable seats (31) through the connecting rod (35), so that the two sets of guide rollers (24) are respectively in contact with the two side edges of the steel being tested; c. Adjusting the height of the support (15) by means of the electric telescopic rod (14) so ​​that the pressing roller (16) contacts the upper surface of the steel; d. Start the conveying roller (13) and the pressing roller (16), convey the area on the steel material to be inspected to the empty space, then close the conveying roller (13) and the pressing roller (16), and stop conveying the steel material; e. Starting the motor at one end of the screw rod (19), the screw rod (19) rotates and drives the detection seat (21) to move laterally along the slide rod (20), the image acquisition head (23) acquires an image of the detection area, and the distance sensor (22) detects the distance between the upper and lower surfaces of the steel and the distance sensor (22); f. After the detection seat (21) moves to the position of the limit plate (25), the distance sensor (29) sends a position signal to the controller, and the controller stops the motor at one end of the screw rod (19) to complete the detection of this area; g. Repeat steps d to f to inspect the next area that needs to be inspected.

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