A galvanized steel strip surface defect detection device and detection method thereof

Abstract

The present invention relates to the technical field of galvanized steel strip detection, and in particular to a device for detecting surface defects of galvanized steel strip and a detection method thereof, comprising: a conveying component for conveying the galvanized steel strip; an adjusting conveying member for guiding the two sides of the galvanized steel strip after entering the interior of the box for detection; two groups of light detection components, which are centrally symmetrically arranged and installed inside the box, the light detection components comprising a laser lamp and a second support frame, a photosensitive sensor being fixed on the side of the second support frame facing the laser lamp; a control unit, for recording the degree and position of defects of the galvanized steel strip after the photosensitive sensor receives light information; this device records the degree and position of defects of the galvanized steel strip according to the intensity of the received light through the setting of the light detection components and the adjusting conveying member, thereby facilitating improving the detection efficiency of defects in the galvanized steel strip.

Description

Technical Field

[0001] The invention relates to the field of galvanized steel strip detection, and in particular to a galvanized steel strip surface defect detection device and a detection method thereof. Background Art

[0002] Galvanized steel strip is a steel strip (a long strip of steel) with a layer of zinc on its surface. This treatment can be hot-dip galvanizing, electro-galvanizing or other galvanizing processes.

[0003] In the production process of galvanized steel strip, when the temperature of zinc liquid is low or the aluminum content in zinc liquid is high and the coating is thicker, zinc protrusion defect will occur. Zinc protrusion refers to the bright dendritic stripes on the edge or middle of the steel strip. This special zinc crystal often protrudes out of the zinc layer, so it is called zinc protrusion. It causes the surface to be rough and uneven, which not only affects the appearance but also affects the use of materials. In the prior art, the detection of zinc protrusions is usually carried out by naked eye, resulting in low recognition efficiency. In addition, under different light conditions, naked eye recognition has certain errors, which affects the recognition accuracy. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings existing in the prior art and to propose a galvanized strip surface defect detection device and a detection method thereof.

[0005] In a first aspect, the present invention provides a galvanized steel strip surface defect detection device, comprising a box body, and further comprising:

[0006] A conveying assembly, installed on the side wall of the box body, for conveying galvanized steel strip;

[0007] An adjusting conveying member is installed inside the box and is used to guide the two sides of the galvanized steel strip entering the box for inspection;

[0008] Two groups of light detection components are centrally symmetrically arranged and installed inside the box, the light detection components include a laser light and a second support frame, and a photosensitive sensor is fixed on the side of the second support frame facing the laser light;

[0009] The photosensitive sensor and the laser light are respectively located on both sides of the adjusting conveyor, so that the light is blocked by the adjusting conveyor, and when there are protrusions or depressions on the surface of the galvanized steel strip, the light passes through and is received by the photosensitive sensor;

[0010] A control unit, used for recording the degree and position of defects of the galvanized steel strip according to the intensity of the received light after the light sensitive sensor receives the light information;

[0011] The galvanized steel strip passes through one end of the conveying assembly and enters the interior of the adjusting conveying member. The adjusting conveying member conveys the galvanized steel strip so that the galvanized steel strip is conveyed twice in parallel with each other during the conveying process inside the box. Then, the galvanized steel strip is supported and conveyed by the conveying assembly and output.

[0012] It should be noted that the galvanized steel strip is provided with a winding roller and an unwinding roller respectively, the unwinding roller is wound with the galvanized steel strip that has not been tested, and the winding roller is wound with the winding roller that has been tested, so that the winding roller is kept in a taut state, which is conducive to the testing;

[0013] Inside the box, when the galvanized steel strip is conveyed horizontally for the first time, the lower surface of the galvanized steel strip is horizontally facing downward, and the laser light of the light detection component is located on the side of the galvanized steel strip facing the inside of the box. The light emitted by the laser light is set horizontally with the galvanized steel strip. The galvanized steel strip is guided by the adjustable conveyor. When it passes through the adjustable conveyor, the adjustable conveyor blocks the light emitted by the laser light. When the surface of the galvanized steel strip is horizontal, the adjustable conveyor fits the galvanized steel strip and is aligned for conveying. When the galvanized steel strip is completely fitted with the adjustable conveyor, the light cannot pass through the adjustable conveyor to be received by the photosensitive sensor. When there are protrusions on the surface of the galvanized steel strip, the protrusion position will A support is formed between the adjusting conveyor and the galvanized steel strip, so that a gap is formed between the adjusting conveyor and the galvanized steel strip. When there is a depression on the surface of the galvanized steel strip, light will also pass through the depression, so that the light will be received by the photosensitive sensor through the gap, so that the photosensitive sensor can identify and record the position of the protrusion or depression after being sensed by light. After receiving the light signal after the photosensitive sensor senses light, the control unit records the degree and position of the defect of the galvanized steel strip according to the intensity of the received light, which is conducive to automatically identifying and detecting the defects on the surface of the galvanized steel strip, thereby helping to improve the detection efficiency of the defects of the galvanized steel strip;

[0014] When the defect spread area on the surface of the galvanized steel strip is long, the photosensor generates light information through long-term exposure, so that the control unit can identify the defect position and defect area according to the photosensitivity time and photosensitivity position of the photosensor, which is beneficial to improve the detection efficiency of galvanized steel strip defects.

[0015] Preferably, the adjusting conveying member comprises:

[0016] Two first support frames are symmetrically fixed inside the box;

[0017] Two sets of conveying rollers are arranged symmetrically to the center;

[0018] The conveying roller comprises a first adjusting roller, a second adjusting roller and a detection roller, all of which are rotatably installed between the two first supporting frames, the first adjusting roller and the detection roller are vertically aligned, and the two sides of the galvanized steel strip are respectively in contact with the first adjusting roller and the detection roller when the galvanized steel strip passes between the first adjusting roller and the detection roller, and the first adjusting roller and the second adjusting roller are horizontally aligned, so that the galvanized steel strip is horizontally arranged when passing through the first adjusting roller and the second adjusting roller for transmission;

[0019] Three motors, all fixed inside one of the first support frames, each of the motors drives the first adjustment roller, the second adjustment roller and the detection roller to rotate through an output shaft;

[0020] The first support frame can rotatably support and install the first adjusting roller, the second adjusting roller and the detection roller. After the motor is started, the first adjusting roller, the second adjusting roller and the detection roller can be driven to rotate through the output shaft, so as to adjust the conveying efficiency of the first adjusting roller, the second adjusting roller and the detection roller for the galvanized steel strip. The first adjusting roller in the conveying roller is vertically aligned with the detection roller, and the first adjusting roller and the second adjusting roller are horizontally aligned. After the galvanized steel strip passes through the first adjusting roller and the detection roller in the first group of conveying rollers, it is horizontally conveyed below the first adjusting roller and the second adjusting roller. At this time, the laser light The light passes through the bottom of the galvanized strip and between the detection rollers. If a gap is formed between the bottom of the galvanized strip and the detection roller due to defects, the light passes through the gap and is received by the photosensitive sensor. If the bottom of the galvanized strip and the detection roller fit together due to no gap, the light cannot pass through, thereby detecting the defects of the galvanized strip. Similarly, when the galvanized strip passes through the second set of conveyor rollers, the upper surface of the galvanized strip is detected, so that when the galvanized strip passes through the inside of the box, defects can be detected on both sides of the galvanized strip at the same time, which is beneficial to improve the efficiency of defect detection on the surface of the galvanized strip.

[0021] Preferably, the detection roller comprises:

[0022] A central axis, rotatably mounted between the two first support frames;

[0023] A plurality of spring groups are arranged in a linear array and fixed to the outer surface of the central shaft, wherein one of the spring groups includes a plurality of springs arranged in a circular array;

[0024] A plurality of detection extrusion rings are arranged in a linear array, one detection extrusion ring corresponds to one spring group, and the inner wall of the detection extrusion ring is fixedly connected to one end of all the springs of the corresponding spring group facing away from the central axis;

[0025] A telescopic isolation frame, which is arranged one by one corresponding to the detection extrusion ring and is fixed on the inner wall of the box body, and is used to isolate the light of the laser lamp;

[0026] By setting the spring, when the galvanized steel strip has no defects, the detection extrusion ring fits with the surface of the galvanized steel strip under the support of the spring, so that light cannot pass through. When there is a convex defect on the surface of the galvanized steel strip, the convex position will squeeze the detection extrusion ring, so that the detection extrusion ring squeezes the spring downward, so that the detection extrusion ring has space to squeeze downward and give way. When the convex defect exists, the deformation of the galvanized steel strip and the detection roller is reduced by moving and giving way, so that the gap between the galvanized steel strip and the detection roller is increased by giving way, thereby increasing the amount of light passing through, which is conducive to improving the accuracy of the detection of surface defects of the galvanized steel strip;

[0027] The setting of the telescopic isolation frame enables the telescopic isolation frame to be synchronously extended and retracted to make way when the detection extrusion ring makes way downward, thereby helping to avoid the situation where light passes under the telescopic isolation frame and interferes with defect detection, thereby helping to improve the accuracy of surface defect detection of galvanized strip steel.

[0028] Preferably, it further comprises a plurality of marking components, wherein the marking components are arranged in one-to-one correspondence with the detection extrusion rings, and the marking components specifically comprise:

[0029] An air cavity is provided inside the detection extrusion ring;

[0030] A groove is formed on the outer diameter side wall of the air cavity;

[0031] A rubber sealing strip, sealingly and slidably connected to the inside of the groove, a marking strip being fixed on the outer ring side wall of the rubber sealing strip;

[0032] An air pump is fixed inside a cavity provided inside the central shaft, a connecting pipe is fixed to an output end of the air pump, and the connecting pipe passes through the central shaft and communicates with the air cavity;

[0033] The solenoid valve is arranged one by one corresponding to the detection extrusion ring and is embedded in the side wall of the detection extrusion ring;

[0034] A pressure sensor is arranged one by one corresponding to the detection extrusion ring and fixed to one end of the telescopic isolation frame facing the detection extrusion ring;

[0035] The control unit is also used to control the air pump to start when the pressure sensor is pressurized, and to control the solenoid valve to open for a specified time when the pressure sensor is no longer pressurized;

[0036] When the detection extrusion ring is caused to give way to the left and right sides of the convex defect, the detection extrusion ring forms an extrusion on the pressure sensor, so that after the pressure sensor is pressurized, the control unit controls the air pump to start, and after the air pump is started, it inflates the inside of the air cavity, so that the internal air pressure of the air cavity increases, and the increased air pressure squeezes the rubber sealing strip, so that the rubber sealing strip moves outward along the groove, so that the rubber sealing strip pushes the marking strip to extend along the groove, so that the marking strip extends out of the surface of the detection extrusion ring, so that during the continuous transmission of the galvanized steel strip, the extended marking strip forms a mark on the surface of the galvanized steel strip, thereby physically marking the defect position, which is beneficial for the staff to process the defect position according to the mark after the galvanized steel strip is inspected, thereby improving the defect detection efficiency of the galvanized steel strip;

[0037] After the raised defect of the galvanized steel strip passes, the pressure on the pressure sensor disappears. At this time, the control unit controls the solenoid valve to open and discharge the air pressure in the air cavity. Then the rubber sealing strip is reset under the influence of its own rubber elastic force, thereby driving the marking strip to reset and no longer marking the surface of the galvanized steel strip.

[0038] Preferably, it also includes:

[0039] After the galvanized steel strip passes through the interior of the box, the interior of the box is divided into two upper and lower detection spaces, the two detection spaces are centrally symmetrically arranged, and the two groups of light detection components and the two groups of conveying rollers are respectively located in the two detection spaces;

[0040] The two detection spaces are both separated by the first adjustment roller and the detection roller, and the detection space is divided into an illumination space on the same side as the laser light and a darkroom space on the same side as the photosensitive sensor;

[0041] A plurality of partitions are arranged one by one corresponding to the detection extrusion rings and are fixed inside the darkroom space to divide the darkroom space into a plurality of single spaces aligned with the corresponding detection extrusion rings;

[0042] The setting of the partition divides the darkroom space, so that when the photosensitive sensor identifies light, the light will not illuminate the entire darkroom space, but will illuminate a single space alone, which is conducive to accurate identification and recording of the location of defects, thereby helping to improve the recognition accuracy of galvanized strip defects.

[0043] Preferably, it further comprises a plurality of transparent chambers, which are arranged one by one corresponding to the light-sensitive sensors, the transparent chambers are fixed on the side walls of the second support frame, the light passes through the transparent chambers to reach the light-sensitive sensors, and the transparent chambers contain water;

[0044] Water is placed inside the transparent bin, so that when light passes through the transparent bin, it can be refracted by the water inside the transparent bin, thereby increasing the brightness of the light, which is beneficial to improving the sensitivity of the photosensitive sensor to light recognition, thereby helping to improve the accuracy of identifying surface defects of the galvanized steel strip.

[0045] Preferably, the conveying assembly comprises:

[0046] A first bracket, fixed to the top of the box;

[0047] A second bracket is fixed to the bottom of the box;

[0048] Two supporting rollers are rotatably mounted inside the first bracket and inside the second bracket respectively;

[0049] The first bracket and the second bracket can support and install the support roller, and the support roller can support and guide the conveyance of the galvanized steel strip.

[0050] In a second aspect, a detection method for a galvanized strip surface defect detection device is provided, the detection method comprising the following steps:

[0051] The control unit acquires pressure information from the pressure sensor;

[0052] The control unit generates mark control information according to the pressure information, and the mark control information is used to control the start of the air pump;

[0053] The control unit sends the marking control information to the air pump to control the start of the air pump;

[0054] When the squeezing ring is detected to move downward under pressure to make way, the squeezing pressure sensor generates pressure information after being pressurized, and sends the pressure information to the control unit. After obtaining the pressure information, the control unit generates marking control information according to the pressure information, and sends the marking control information to the air pump to control the start of the air pump. After the air pump is started, the air cavity is inflated to trigger the mark.

[0055] Preferably, a warning light is fixedly mounted on the outer wall of the box, and further comprises:

[0056] The control unit acquires the illumination information from the photosensitive sensor;

[0057] The controller generates warning control information according to the illumination information, and the warning control information is used to control the activation of the warning light;

[0058] The controller sends the warning control information to the warning light to control the warning light to start;

[0059] After receiving the light, the photosensitive sensor generates light information and sends the light information to the control unit. After receiving the light information, the control unit generates warning control information according to the light information and sends the warning control information to the warning light to control the warning light to start and light up to warn of the defective location.

[0060] Preferably, it also includes:

[0061] The control unit generates deceleration conveying control information while generating the warning control information, and the deceleration conveying control information is used to control the regulating conveying member to start deceleration conveying;

[0062] The control unit sends the deceleration conveying control information to the regulating conveying member to control the regulating conveying member to start deceleration conveying;

[0063] After receiving the illumination information, the control unit generates warning control information according to the illumination information and generates deceleration control information at the same time, and sends the deceleration control information to the regulating conveying member to control the regulating conveying member to start deceleration conveying, so that the galvanized steel strip is decelerated after the defect is detected, so that the marking strip can mark the defect position, which is beneficial to avoid the situation where the contact time between the marking strip and the galvanized steel strip is short when the galvanized steel strip is conveyed quickly, resulting in shallow marking and affecting the marking accuracy.

[0064] Compared with the prior art, the present invention has the following beneficial effects: the present invention records the degree and position of defects of the galvanized steel strip according to the intensity of received light through the setting of the light detection component and the adjustment of the conveying member, thereby facilitating automatic identification and detection of defects on the surface of the galvanized steel strip, thereby facilitating improvement of the detection efficiency of defects in the galvanized steel strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is a schematic diagram of the method flow of the present invention.

[0066] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0067] Figure 3 It is a schematic structural diagram of the internal components of the box body of the present invention.

[0068] Figure 4 The structure of the present invention after the overall section is schematically shown. Figure 1 .

[0069] Figure 5 For the present invention Figure 4 Schematic diagram of the enlarged structure at point A in the middle.

[0070] Figure 6 The structure of the present invention after the overall section is schematically shown. Figure 2 .

[0071] Figure 7 For the present invention Figure 6 Schematic diagram of the enlarged structure at point B in the middle.

[0072] Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure at point C in the middle.

[0073] Fig. 9 It is a schematic diagram of the structure after detecting the cross section of the extrusion ring of the present invention.

[0074] Fig.10 For the present invention Fig. 9 Schematic diagram of the enlarged structure at D in the middle.

[0075] Fig.11 It is a schematic structural diagram of the rubber sealing strip and the marking strip of the present invention.

[0076] In the figure: 1. box body; 101. first bracket; 102. second bracket; 103. support roller; 201. first adjustment roller; 202. second adjustment roller; 203. detection roller; 204. first support frame; 205. motor; 3. laser light; 4. central axis; 401. spring; 402. detection extrusion ring; 403. telescopic isolation frame; 404. pressure sensor; 5. second support frame; 501. photosensor; 6. transparent chamber; 7. air pump; 701. connecting pipe; 702. rubber sealing strip; 703. groove; 704. air cavity; 705. marking strip; 8. partition. DETAILED DESCRIPTION

[0077] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0078] like Figures 2 to 11 The device for detecting surface defects of galvanized steel strip shown in the figure comprises a box 1, and further comprises:

[0079] A conveying assembly, installed on the side wall of the box 1, for conveying galvanized steel strip;

[0080] The adjusting conveyor is installed inside the box 1 and is used to guide the two sides of the galvanized steel strip entering the box 1 for inspection;

[0081] Two sets of light detection components are centrally symmetrically arranged and installed inside the box 1. The light detection components include a laser light 3 and a second support frame 5. A photosensitive sensor 501 is fixed on the side of the second support frame 5 facing the laser light 3.

[0082] The photosensitive sensor 501 and the laser light 3 are respectively located on both sides of the adjusting conveyor, so that the light is blocked by the adjusting conveyor, and when there are protrusions or depressions on the surface of the galvanized steel strip, the light passes through and is received by the photosensitive sensor 501;

[0083] A control unit, for recording the degree and position of defects of the galvanized steel strip according to the intensity of the received light after the light sensor 501 receives the light information;

[0084] In the production process of galvanized steel strip, when the temperature of zinc liquid is low or the aluminum content in zinc liquid is high, the coating is thicker and zinc protrusion defect will occur. Zinc protrusion refers to the bright dendritic stripes on the edge or middle of the steel strip. This special zinc crystal often protrudes out of the zinc layer, so it is called zinc protrusion. It causes the surface to be rough and uneven, which not only affects the appearance but also affects the use of materials. In the prior art, the detection of zinc protrusion is usually carried out by naked eyes, resulting in low recognition efficiency. In addition, under different light conditions, naked eye recognition has certain errors, thus affecting the recognition accuracy.

[0085] This embodiment of the present invention can solve the above problems. The specific implementation method is as follows: the galvanized steel strip passes through one end of the conveying assembly and enters the interior of the adjusting conveying member. The adjusting conveying member conveys the galvanized steel strip, so that the galvanized steel strip is conveyed twice in parallel with each other during the conveying process inside the box 1. Then, the galvanized steel strip is supported by the conveying assembly and conveyed and output;

[0086] It should be noted that the galvanized steel strip is provided with a winding roller and an unwinding roller respectively, the unwinding roller is wound with the galvanized steel strip that has not been tested, and the winding roller is wound with the winding roller that has been tested, so that the winding roller is kept in a taut state, which is conducive to the testing;

[0087] Inside the box 1, when the galvanized strip is transported horizontally for the first time, Figure 6As shown, the lower surface of the galvanized steel strip is horizontally facing downward, the laser lamp 3 of the light detection component is located on the side of the galvanized steel strip facing the inside of the box 1, and the light emitted by the laser lamp 3 is set horizontally with the galvanized steel strip. The galvanized steel strip is guided by the adjustable conveyor. When passing through the adjustable conveyor, the adjustable conveyor blocks the light emitted by the laser lamp 3. When the surface of the galvanized steel strip is horizontal, the adjustable conveyor fits the galvanized steel strip and is aligned for conveying. When the galvanized steel strip is completely fitted with the adjustable conveyor, the light cannot pass through the adjustable conveyor to be received by the photosensitive sensor 501. When there is a protrusion on the surface of the galvanized steel strip, the protrusion position will be between the adjusting conveyor and the galvanized steel strip. Support is formed between the steel strips, so that a gap is formed between the adjusting conveyor and the galvanized steel strip. When there is a depression on the surface of the galvanized steel strip, light will also pass through the depression, so that the light will be received by the photosensitive sensor 501 through the gap, so that the photosensitive sensor 501 can identify and record the position of the protrusion or depression after being sensed. After receiving the light signal after being sensed by the photosensitive sensor 501, the control unit records the degree and position of the defect of the galvanized steel strip according to the intensity of the received light, so as to automatically identify and detect the defects on the surface of the galvanized steel strip, thereby helping to improve the detection efficiency of the defects of the galvanized steel strip;

[0088] When the defect spread area on the surface of the galvanized steel strip is long, the photosensitive sensor 501 generates light information through long-term exposure, so that the control unit can identify the defect position and defect area according to the photosensitivity time and photosensitivity position of the photosensitive sensor 501, which is beneficial to improve the detection efficiency of galvanized steel strip defects.

[0089] As an optional embodiment, the adjusting conveying member includes:

[0090] Two first support frames 204 are symmetrically fixed inside the box body 1;

[0091] Two sets of conveying rollers are arranged symmetrically to the center;

[0092] The conveying rollers include a first adjusting roller 201, a second adjusting roller 202 and a detection roller 203, all of which are rotatably installed between two first support frames 204. The first adjusting roller 201 and the detection roller 203 are vertically aligned. When the galvanized steel strip passes between the first adjusting roller 201 and the detection roller 203, the two sides contact the two rollers respectively. The first adjusting roller 201 and the second adjusting roller 202 are horizontally aligned, so that the galvanized steel strip is horizontally arranged when passing through the first adjusting roller 201 and the second adjusting roller 202.

[0093] Three motors 205 are fixed inside one of the first support frames 204, and each motor 205 drives the first adjustment roller 201, the second adjustment roller 202 and the detection roller 203 to rotate through an output shaft;

[0094] The first support frame 204 can rotatably support and install the first adjusting roller 201, the second adjusting roller 202 and the detection roller 203. After the motor 205 is started, it can drive the first adjusting roller 201, the second adjusting roller 202 and the detection roller 203 to rotate through the output shaft, so as to adjust the conveying efficiency of the first adjusting roller 201, the second adjusting roller 202 and the detection roller 203 to the galvanized steel strip. The first adjusting roller 201 and the detection roller 203 in the conveying roller are vertically aligned, and the first adjusting roller 201 and the second adjusting roller 202 are horizontally aligned, so that after the galvanized steel strip passes through the first adjusting roller 201 and the detection roller 203 in the first group of conveying rollers, the first adjusting roller 201 and the second adjusting roller 202 are horizontally aligned. The galvanized steel strip is horizontally transported below the roller 202. At this time, the light of the laser lamp 3 passes through the bottom of the galvanized steel strip and between the detection roller 203. If a gap is formed between the bottom of the galvanized steel strip and the detection roller 203 due to the existence of defects, the light passes through the gap and is received by the photosensitive sensor 501. If the bottom of the galvanized steel strip and the detection roller 203 are in contact with each other due to the absence of a gap, the light cannot pass through at this time, thereby detecting the defects of the galvanized steel strip. Similarly, when the galvanized steel strip passes through the second set of conveying rollers, the upper surface of the galvanized steel strip is detected. Therefore, when the galvanized steel strip passes through the interior of the box body 1, defects can be detected on both sides of the galvanized steel strip at the same time, which is beneficial to improving the efficiency of defect detection on the surface of the galvanized steel strip.

[0095] As an optional embodiment, the detection roller 203 includes:

[0096] The central shaft 4 is rotatably mounted between the two first support frames 204;

[0097] A plurality of spring groups are arranged in a linear array and fixed on the outer surface of the central shaft 4, wherein one spring group includes a plurality of springs 401 arranged in a circular array;

[0098] A plurality of detection extrusion rings 402 are arranged in a linear array, one detection extrusion ring 402 corresponds to one spring group, and the inner wall of the detection extrusion ring 402 is fixedly connected to one end of all the springs 401 of the corresponding spring group facing away from the central axis 4;

[0099] The telescopic isolation frame 403 is arranged one-to-one with the detection extrusion ring 402 and is fixed on the inner wall of the box body 1 to isolate the light of the laser lamp 3;

[0100] When there is a raised defect on the surface of the galvanized steel strip, the galvanized steel strip and the detection roller 203 are squeezed by the defect position, and both the detection roller 203 and the galvanized steel strip are deformed due to the squeezing, so that when the defect position is small, the gap between the galvanized steel strip and the detection roller 203 is small, which makes the light passing through unclear, thereby affecting the detection result;

[0101] By setting the spring 401, when the galvanized steel strip has no defects, the detection extrusion ring 402 is in contact with the surface of the galvanized steel strip under the support of the spring 401, so that light cannot pass through. When there is a convex defect on the surface of the galvanized steel strip, the convex position will squeeze the detection extrusion ring 402, so that the detection extrusion ring 402 squeezes the spring 401 downward, so that the detection extrusion ring 402 has space to squeeze downward and give way, so that when the convex defect exists, the deformation of the galvanized steel strip and the detection roller 203 is reduced by moving and giving way, so that the gap between the galvanized steel strip and the detection roller 203 is increased by giving way, thereby increasing the amount of light passing through, which is beneficial to improving the accuracy of the detection of surface defects of the galvanized steel strip;

[0102] The setting of the telescopic isolation frame 403 enables the telescopic isolation frame 403 to be synchronously extended and retracted to make way when the detection extrusion ring 402 makes way downward, thereby helping to avoid the situation where light passes under the telescopic isolation frame 403 and interferes with defect detection, thereby helping to improve the accuracy of surface defect detection of galvanized strip steel.

[0103] As an optional embodiment, a plurality of marking components are further included. The marking components are arranged in a one-to-one correspondence with the detection extrusion ring 402. The marking components specifically include:

[0104] The air cavity 704 is provided inside the detection extrusion ring 402;

[0105] A groove 703 is formed on the outer diameter side wall of the air cavity 704;

[0106] A rubber sealing strip 702 is sealingly and slidably connected to the inside of the groove 703, and a marking strip 705 is fixed on the outer side wall of the rubber sealing strip 702;

[0107] The air pump 7 is fixed inside the cavity provided inside the central shaft 4. A connecting pipe 701 is fixed to the output end of the air pump 7. The connecting pipe 701 passes through the central shaft 4 and communicates with the air cavity 704.

[0108] The solenoid valve is arranged one by one with the detection extrusion ring 402 and is embedded in the side wall of the detection extrusion ring 402;

[0109] The pressure sensor 404 is arranged one by one corresponding to the detection extrusion ring 402 and fixed to one end of the telescopic isolation frame 403 facing the detection extrusion ring 402;

[0110] The control unit is also used to control the air pump 7 to start when the pressure sensor 404 is pressurized, and to control the solenoid valve to open for a specified time when the pressure sensor 404 is no longer pressurized;

[0111] When the detection extrusion ring 402 gives way to the left and right sides of the convex defect, the detection extrusion ring 402 squeezes the pressure sensor 404, so that after the pressure sensor 404 is pressurized, the control unit controls the air pump 7 to start. After the air pump 7 is started, it inflates the inside of the air cavity 704, so that the internal air pressure of the air cavity 704 increases. The increased air pressure squeezes the rubber sealing strip 702, so that the rubber sealing strip 702 moves outward along the groove 703, so that the rubber sealing strip 702 pushes the marking strip 705 to extend along the groove 703, so that the marking strip 705 extends out of the surface of the detection extrusion ring 402, so that during the continuous transmission of the galvanized steel strip, the extended marking strip 705 forms a mark on the surface of the galvanized steel strip, thereby physically marking the defect position, which is beneficial for the staff to process the defect position according to the mark after the galvanized steel strip is inspected, thereby improving the defect detection efficiency of the galvanized steel strip;

[0112] After the raised defect of the galvanized steel strip passes, the pressure on the pressure sensor 404 disappears. At this time, the control unit controls the solenoid valve to open and discharge the air pressure in the air cavity 704. Then the rubber sealing strip 702 is reset under the influence of its own rubber elastic force, thereby driving the marking strip 705 to reset and no longer mark the surface of the galvanized steel strip.

[0113] As an optional embodiment, it also includes:

[0114] After the galvanized steel strip passes through the interior of the box 1, the interior of the box 1 is divided into two upper and lower detection spaces, the two detection spaces are centrally symmetrically arranged, and the two sets of optical detection components and the two sets of conveying rollers are respectively located in the two detection spaces;

[0115] The two detection spaces are separated by the first adjustment roller 201 and the detection roller 203, and the detection space is divided into an illumination space on the same side as the laser light 3 and a dark room space on the same side as the photosensitive sensor 501;

[0116] A plurality of partitions 8 are arranged one by one corresponding to the detection extrusion rings 402 and are fixed inside the darkroom space to divide the darkroom space into a plurality of single spaces aligned with the corresponding detection extrusion rings 402;

[0117] The setting of the partition 8 divides the darkroom space, so that when the photosensitive sensor 501 identifies light, the light will not illuminate the entire darkroom space, but will illuminate a single space alone, which is conducive to accurate identification and recording of the location of the defect, thereby helping to improve the recognition accuracy of galvanized strip defects.

[0118] As an optional embodiment, it further includes a plurality of transparent chambers 6, which are arranged one by one corresponding to the photosensitive sensors 501, and the transparent chambers 6 are fixed to the side walls of the second support frame 5. The light passes through the transparent chambers 6 and reaches the photosensitive sensors 501. The transparent chambers 6 contain water.

[0119] The transparent chamber 6 is filled with water, so that when light passes through the transparent chamber 6, it can be refracted by the water inside the transparent chamber 6, thereby increasing the brightness of the light, which is beneficial to improving the sensitivity of the photosensitive sensor 501 to light recognition, thereby helping to improve the accuracy of identifying surface defects of the galvanized steel strip.

[0120] As an optional embodiment, the conveying assembly includes:

[0121] The first bracket 101 is fixed to the top of the box 1;

[0122] The second bracket 102 is fixed to the bottom of the box 1;

[0123] Two support rollers 103 are rotatably mounted inside the first bracket 101 and inside the second bracket 102 respectively;

[0124] The first bracket 101 and the second bracket 102 can support and install the support roller 103, and the support roller 103 can support and guide the conveyance of the galvanized steel strip.

[0125] like Figure 1 A detection method for a galvanized steel strip surface defect detection device is shown, and the detection method comprises the following steps:

[0126] The control unit obtains pressure information from the pressure sensor 404;

[0127] The control unit generates marking control information according to the pressure information, and the marking control information is used to control the start of the air pump 7;

[0128] The control unit sends the marking control information to the air pump 7 to control the air pump 7 to start;

[0129] When the squeezing ring 402 is detected to move downward under pressure to make way, the squeezing pressure sensor 404 generates pressure information after being pressurized, and sends the pressure information to the control unit. After obtaining the pressure information, the control unit generates marking control information according to the pressure information, and sends the marking control information to the air pump 7 to control the start of the air pump 7. After the air pump 7 is started, the air cavity 704 is inflated to trigger the mark.

[0130] As an optional embodiment, a warning light is fixedly installed on the outer wall of the box body 1, and further includes:

[0131] The control unit obtains the light information from the light sensor 501;

[0132] The controller generates warning control information according to the illumination information, and the warning control information is used to control the activation of the warning light;

[0133] The controller sends the warning control information to the warning light to control the warning light to start;

[0134] After receiving the light, the photosensitive sensor 501 generates light information and sends the light information to the control unit. After receiving the light information, the control unit generates warning control information according to the light information and sends the warning control information to the warning light to control the warning light to start and light up to warn the defective position.

[0135] As an optional embodiment, it also includes:

[0136] The control unit generates deceleration conveying control information while generating the warning control information, and the deceleration conveying control information is used to control the regulating conveying member to start deceleration conveying;

[0137] The control unit sends the deceleration conveying control information to the regulating conveying member to control the regulating conveying member to start the deceleration conveying;

[0138] After receiving the illumination information, the control unit generates warning control information according to the illumination information and generates deceleration control information at the same time, and sends the deceleration control information to the regulating conveyor to control the regulating conveyor to start deceleration, so that the galvanized steel strip is decelerated after the defect is detected, so that the marking strip 705 can mark the defect position, which is beneficial to avoid the situation where the contact time between the marking strip 705 and the galvanized steel strip is short when the galvanized steel strip is conveyed quickly, resulting in shallow marking and affecting the marking accuracy.

[0139] The working principle of the present invention is as follows: the galvanized steel strip passes through one end of the conveying assembly and enters the interior of the adjusting conveying member, and the adjusting conveying member conveys the galvanized steel strip, so that the galvanized steel strip is conveyed twice in parallel with each other during the conveying process inside the box 1, and then the galvanized steel strip is supported by the conveying assembly and conveyed and output;

[0140] It should be noted that the galvanized steel strip is provided with a winding roller and an unwinding roller respectively, the unwinding roller is wound with the galvanized steel strip that has not been tested, and the winding roller is wound with the winding roller that has been tested, so that the winding roller is kept in a taut state, which is conducive to the testing;

[0141] Inside the box 1, when the galvanized strip is transported horizontally for the first time, Figure 6As shown, the lower surface of the galvanized steel strip is horizontally facing downward, the laser lamp 3 of the light detection component is located on the side of the galvanized steel strip facing the inside of the box 1, and the light emitted by the laser lamp 3 is set horizontally with the galvanized steel strip. The galvanized steel strip is guided by the adjustable conveyor. When passing through the adjustable conveyor, the adjustable conveyor blocks the light emitted by the laser lamp 3. When the surface of the galvanized steel strip is horizontal, the adjustable conveyor fits the galvanized steel strip and is aligned for conveying. When the galvanized steel strip is completely fitted with the adjustable conveyor, the light cannot pass through the adjustable conveyor to be received by the photosensitive sensor 501. When there is a protrusion on the surface of the galvanized steel strip, the protrusion position will be between the adjusting conveyor and the galvanized steel strip. Support is formed between the steel strips, so that a gap is formed between the adjusting conveyor and the galvanized steel strip. When there is a depression on the surface of the galvanized steel strip, light will also pass through the depression, so that the light will be received by the photosensitive sensor 501 through the gap, so that the photosensitive sensor 501 can identify and record the position of the protrusion or depression after being sensed. After receiving the light signal after being sensed by the photosensitive sensor 501, the control unit records the degree and position of the defect of the galvanized steel strip according to the intensity of the received light, so as to automatically identify and detect the defects on the surface of the galvanized steel strip, thereby helping to improve the detection efficiency of the defects of the galvanized steel strip;

[0142] When the defect spread area on the surface of the galvanized steel strip is long, the photosensitive sensor 501 generates light information through long-term exposure, so that the control unit can identify the defect position and defect area according to the photosensitivity time and photosensitivity position of the photosensitive sensor 501, which is beneficial to improve the detection efficiency of galvanized steel strip defects.

[0143] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A galvanized steel strip surface defect detection device, comprising a housing (1), characterized in that: Also includes: A conveying assembly, installed on the side wall of the box (1), and used for conveying galvanized steel strip; An adjusting conveying member installed inside the box (1) and used to guide the two sides of the galvanized steel strip entering the box (1) for inspection; Two groups of light detection components are centrally symmetrically arranged and installed inside the box (1), the light detection components comprising a laser light (3) and a second support frame (5), a light sensor (501) being fixed on a side of the second support frame (5) facing the laser light (3); The photosensitive sensor (501) and the laser light (3) are respectively located on both sides of the adjustable conveyor, so that the light is blocked by the adjustable conveyor, and when there are protrusions or depressions on the surface of the galvanized steel strip, the light passes through and is received by the photosensitive sensor (501); A control unit is used to record the degree and position of defects of the galvanized steel strip according to the intensity of the received light after the light sensitive sensor (501) receives the light information.

2. A galvanized steel strip surface defect detection device according to claim 1, characterized in that: The regulating conveying member comprises: Two first support frames (204) are symmetrically fixed inside the box (1); Two sets of conveying rollers are arranged symmetrically to the center; The conveying rollers comprise a first adjusting roller (201), a second adjusting roller (202) and a detection roller (203), all of which are rotatably mounted between the two first support frames (204); the first adjusting roller (201) and the detection roller (203) are arranged vertically aligned, and when the galvanized steel strip passes between the first adjusting roller (201) and the detection roller (203), the two sides contact the two rollers respectively; the first adjusting roller (201) and the second adjusting roller (202) are arranged horizontally aligned, so that the galvanized steel strip is arranged horizontally when passing through the first adjusting roller (201) and the second adjusting roller (202); Three motors (205) are each fixed inside one of the first support frames (204), and each of the motors (205) drives the first adjustment roller (201), the second adjustment roller (202) and the detection roller (203) to rotate via an output shaft.

3. A galvanized steel strip surface defect detection device according to claim 2, characterized in that: The detection roller (203) comprises: A central shaft (4) rotatably mounted between the two first support frames (204); A plurality of spring groups, arranged in a linear array and fixed to the outer surface of the central shaft (4), wherein one of the spring groups comprises a plurality of springs (401) arranged in a circular array; A plurality of detection extrusion rings (402) are arranged in a linear array, one detection extrusion ring (402) corresponds to one spring group, and the inner wall of the detection extrusion ring (402) is fixedly connected to one end of all the springs (401) of the corresponding spring group that are away from the central axis (4); The telescopic isolation frame (403) is arranged in one-to-one correspondence with the detection extrusion ring (402) and is fixed on the inner wall of the box body (1) and is used to isolate the light of the laser lamp (3).

4. A galvanized steel strip surface defect detection device according to claim 3, characterized in that: It also includes a plurality of marking components, which are arranged in a one-to-one correspondence with the detection extrusion ring (402), and the marking components specifically include: An air cavity (704) is provided inside the detection extrusion ring (402); A groove (703) is formed through the outer diameter side wall of the air cavity (704); A rubber sealing strip (702) is sealingly and slidably connected to the interior of the groove (703), and a marking strip (705) is fixed on the outer ring side wall of the rubber sealing strip (702); An air pump (7) is fixed inside a cavity provided inside the central shaft (4); a connecting pipe (701) is fixed to an output end of the air pump (7); the connecting pipe (701) passes through the central shaft (4) and is connected to the air cavity (704); A solenoid valve, arranged in one-to-one correspondence with the detection extrusion ring (402), and penetrating and embedded in the side wall of the detection extrusion ring (402); A pressure sensor (404) is arranged in one-to-one correspondence with the detection extrusion ring (402) and is fixed to one end of the telescopic isolation frame (403) facing the detection extrusion ring (402); The control unit is also used to control the air pump (7) to start when the pressure sensor (404) is pressurized, and to control the solenoid valve to open for a specified time when the pressure sensor (404) is no longer pressurized.

5. A galvanized steel strip surface defect detection device according to claim 4, characterized in that: Also includes: After the galvanized steel strip passes through the interior of the box (1), the interior of the box (1) is divided into two upper and lower detection spaces, the two detection spaces are centrally symmetrically arranged, and the two groups of light detection components and the two groups of conveying rollers are respectively located inside the two detection spaces; The two detection spaces are separated by the first adjustment roller (201) and the detection roller (203), so that the detection space is divided into an illumination space on the same side as the laser light (3) and a darkroom space on the same side as the photosensitive sensor (501); A plurality of partitions (8) are arranged in one-to-one correspondence with the detection extrusion rings (402), and are all fixed inside the darkroom space, so as to divide the darkroom space into a plurality of single spaces aligned with the corresponding detection extrusion rings (402).

6. A galvanized steel strip surface defect detection device according to claim 4, characterized in that: It also comprises a plurality of transparent chambers (6) which are arranged in one-to-one correspondence with the light-sensitive sensors (501); the transparent chambers (6) are fixed to the side walls of the second support frame (5); light passes through the transparent chambers (6) and reaches the light-sensitive sensors (501); and water is contained inside the transparent chambers (6).

7. A galvanized steel strip surface defect detection device according to claim 4, characterized in that: The conveying assembly comprises: A first bracket (101) is fixed to the top of the box (1); A second bracket (102) is fixed to the bottom of the box (1); Two supporting rollers (103) are rotatably mounted inside the first bracket (101) and inside the second bracket (102), respectively.

8. A detection method for a galvanized steel strip surface defect detection device, applicable to a galvanized steel strip surface defect detection device as claimed in any one of claims 5 to 7, characterized in that: The detection method comprises the following steps: The control unit acquires pressure information from the pressure sensor (404); The control unit generates marking control information according to the pressure information, wherein the marking control information is used to control the start of the air pump (7); The control unit sends the marking control information to the air pump (7) to control the start of the air pump (7).

9. The detection method of the galvanized steel strip surface defect detection device according to claim 8, characterized in that: A warning light is fixedly mounted on the outer wall of the box body (1), and further comprises: The control unit acquires illumination information from the light-sensitive sensor (501); The controller generates warning control information according to the illumination information, and the warning control information is used to control the activation of the warning light; The controller sends the warning control information to the warning light to control the warning light to start.

10. The detection method of the galvanized steel strip surface defect detection device according to claim 9, characterized in that: Also includes: The control unit generates deceleration conveying control information while generating the warning control information, and the deceleration conveying control information is used to control the regulating conveying member to start deceleration conveying; The control unit sends the deceleration conveying control information to the regulating conveying member to control the regulating conveying member to start deceleration conveying.

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