A hot-rolled plate surface defect detection system

Abstract

The application discloses a kind of hot-rolled medium plate surface defect detection systems, including detection roller way, upper surface inspection, lower surface inspection, control system, detection roller way is opened with upper and lower through observation passage, upper surface inspection includes the upper surface inspection chamber being arranged in detection roller way upper, the upper sealing box being set in upper surface inspection chamber, the first camera and first light source being set in upper sealing box, the bottom of upper surface inspection chamber is opened with light transmission port, lower surface inspection includes the lower surface inspection chamber being arranged in detection roller way lower, the lower observation box being set in lower surface inspection chamber, second camera, second light source, the top of lower surface inspection chamber is opened with observation port with observation passage alignment, lower observation box top opening and cover in observation port form sealing, bottom is opened with light transmission port, second camera, second light source are located below lower observation box, the light transmission port on upper surface inspection chamber, lower observation box is all sealed by glass.The application has the advantages that: system synchronously realizes for the image on-line identification of steel plate upper and lower surface, significantly improves identification efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of hot-rolled plate surface defect detection system, more particularly to a kind of system that can realize the online detection of hot-rolled steel plate upper and lower surface defects simultaneously, belong to the technical field of steel plate surface defect detection. BACKGROUND

[0002] In the manufacturing process of steel plate, due to raw materials, rolling equipment and processing technology and other reasons, resulting in continuous casting slab, hot-rolled steel plate and cold-rolled steel plate surface is prone to pitting, pitting, scratches, inclusions, indentation and other different types of defects, these defects not only seriously affect the appearance of the product, more seriously reduce the corrosion resistance, wear resistance and fatigue strength of the product.

[0003] Plate steel is one of the important products of steel industry, mainly used in aerospace, bridge construction, automobile manufacturing and national defense equipment and other fields. In the rolling process, compared with cold-rolled sheet, plate steel needs to adopt hot rolling process, and the rolling process is carried out in high temperature radiation, dust, smoke, noise and other harsh environment, which is extremely unfavorable for image acquisition of industrial camera, therefore, at present, in the field of hot-rolled plate, it still depends on artificial judgment of steel plate surface defects. However, due to the limitation of production rhythm, the observation time of artificial detection is very limited, easy to fatigue, labor intensity is big, and there is serious subjectivity. SUMMARY

[0004] The purpose of the present application is to provide a kind of hot-rolled plate surface defect detection system, to realize the online automatic detection of hot-rolled steel plate upper and lower surface defects simultaneously, improve detection accuracy and detection efficiency.

[0005] Technical solution: a hot-rolled medium plate surface defect detection system, comprising a detection roller way, an upper surface detection, a lower surface detection and a control system, an observation channel is arranged on the detection roller way, the upper surface detection comprises an upper surface detection chamber arranged above the detection roller way, an upper sealing box arranged in the upper surface detection chamber, a first camera and a first light source arranged in the upper sealing box, a light transmission port is arranged at the bottom of the upper surface detection chamber, the lower surface detection comprises a lower surface detection chamber arranged below the detection roller way, a lower observation box, a second camera and a second light source arranged in the lower surface detection chamber, an observation port is arranged at the top of the lower surface detection chamber and is aligned with the observation channel, the lower observation box is open at the top and is covered on the observation port to form a seal, a light transmission port is arranged at the bottom, the second camera and the second light source are arranged below the lower observation box, the light transmission ports on the upper surface detection chamber and the lower observation box are sealed by glass; the steel plate is conveyed on the detection roller way, the first camera and the first light source are used to collect the upper surface image of the steel plate through the light transmission port of the upper surface detection chamber, the second camera and the second light source are used to collect the lower surface image of the steel plate through the light transmission port, the observation port and the observation channel of the lower observation box in sequence, and the first camera, the first light source, the second camera and the second light source are respectively connected with the control system.

[0006] The principle of the present application is that the detection roller way is connected with the rolling roller way, after the steel plate is rolled, it is directly conveyed to the detection roller way through the rolling roller way, when it reaches the position between the upper surface detection and the lower surface detection, the control system signal controls the first camera and the first light source to start, the upper surface of the steel plate is lighted and the image is collected through the light transmission port of the upper surface detection chamber, and the collected upper surface image of the steel plate is transmitted to the external computer. At the same time, the control system signal controls the second camera and the second light source in the lower surface detection chamber to start, and collects the lower surface image of the steel plate through the light transmission port, the observation port and the observation channel on the detection roller way in sequence, and transmits the collected lower surface image of the steel plate to the external computer, processes and identifies the image through the computer, so as to locate the upper and lower surface defects of the steel plate at the same time. In addition, the upper surface detection and the lower surface detection of the detection system of the present application adopt a sealing structure, which can avoid the influence of high temperature and dust on the performance of the camera and the light source as much as possible.

[0007] Further, the detection roller includes a driven roller arranged between the upper detector and the lower detector, and the counter is connected with the driven roller and the control system. In the structure, the counter is used as the control switch for starting the first camera, the first light source, the second camera and the second light source. When the steel plate is conveyed on the detection roller and reaches the position between the upper detector and the lower detector, the driven roller is driven to rotate, and the counter receives the signal of the steel plate reaching the position through the rotation of the driven roller. After the signal is fed back to the control system, the control system controls the first camera, the first light source, the second camera and the second light source to start shooting, so as to accurately start the shooting. Meanwhile, the control system can control the first camera, the first light source, the second camera and the second light source to stop shooting after the driven roller stops rotating.

[0008] Further, the detection roller includes a driven roller arranged between the upper detector and the lower detector, and the counter is connected with the driven roller and the control system. In the structure, the counter is used as the control switch for starting the first camera, the first light source, the second camera and the second light source. When the steel plate is conveyed on the detection roller and reaches the position between the upper detector and the lower detector, the driven roller is driven to rotate, and the counter receives the signal of the steel plate reaching the position through the rotation of the driven roller. After the signal is fed back to the control system, the control system controls the first camera, the first light source, the second camera and the second light source to start shooting, so as to accurately start the shooting. Meanwhile, the control system can control the first camera, the first light source, the second camera and the second light source to stop shooting after the driven roller stops rotating.

[0009] Further, the lower detector further includes a dust cleaning device, the dust cleaning device includes a dust removal pipeline and a suction gun, a notch is arranged on the side surface of the lower observation box, one end of the dust removal pipeline is connected with an external dust collector, and the other end of the dust removal pipeline is connected with the suction gun, the suction gun extends to the upper side of the light transmission port of the lower observation box through the notch, and is used for sucking the dust accumulated on the glass of the light transmission port of the lower observation box.

[0010] Further, the second camera is longitudinally arranged in parallel, and each second camera collects the image of the lower surface of the steel plate through a light transmission port of the lower observation box, so as to expand the longitudinal range of the collected image and adapt to steel plates with different widths.

[0011] Further, the lower surface inspection chamber further comprises a sliding device, the sliding device comprises a support, a cylinder, a connecting plate, a bottom plate and fixing blocks, the number of the dust cleaning device, the lower observation box gap and the fixing blocks are one-to-one corresponding, the support is fixed in the lower surface inspection chamber, the fixed end of the cylinder is connected with the support and the output end is connected with the connecting plate, the connecting plate is connected with the bottom plate, the fixing blocks are fixed on the bottom plate and each fixing block is fixed with the suction gun, the cylinder drives the bottom plate to move longitudinally through the connecting plate and drives the suction gun to reciprocate above the light transmission port of the lower observation box to further optimize the dust cleaning effect.

[0012] Further, the sliding device further comprises a sliding rod and a sliding block, the sliding rod is fixed on the support and the sliding block is installed on the sliding rod, the top of the connecting plate is fixedly connected with the sliding block and the side wall is fixedly connected with the cylinder to strengthen the supporting effect of the bottom plate.

[0013] Further, a brush is installed on the lower observation box gap to prevent dust from leaking from the lower observation box gap.

[0014] Advantages: compared with the prior art, the advantages of the present application are that the system synchronously realizes image recognition of the upper and lower surfaces of the steel plate and realizes online detection under the motion state of the steel plate, and the recognition efficiency is significantly improved. Meanwhile, the sealing, heat insulation and dust cleaning structure is added, and the influence of the harsh environment under the hot rolling condition on the system is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a perspective view of the present application;

[0016] Figure 2 is a perspective view of the present application;

[0017] Figure 3 is a perspective view of the present application;

[0018] Figure 4 is a perspective view of the present application;

[0019] Figure 5 is a perspective view of the present application;

[0020] Figure 6 is a perspective view of the present application. DETAILED DESCRIPTION

[0021] The present application will be further illustrated below in combination with the drawings and specific embodiments, and these embodiments are only used to illustrate the present application and not used to limit the scope of the present application.

[0022] A hot-rolled medium plate surface defect detection system, as shown in Figure 1 , 2As shown, it includes a detection roller conveyor 1, an upper surface inspection device 2, a lower surface inspection device 3, glass 4, a counter 5, a laser sensor 6, a brush 7, and a control system.

[0023] like Figure 2 As shown, the inspection roller conveyor 1 has an observation channel 1a that runs vertically through it, and a driven roller 1b located between the upper inspection plate 2 and the lower inspection plate 3. The inspection roller conveyor 1 is connected to the steel rolling roller conveyor so that after the steel plate is rolled, it can be directly transported to the inspection roller conveyor for online inspection.

[0024] like Figure 1 , 2 As shown, the upper surface inspection 2 includes an upper surface inspection chamber 2a arranged above the inspection roller conveyor 1, an upper sealed box 2b disposed within the upper surface inspection chamber 2a, a first camera 2c and a first light source 2d disposed within the upper sealed box 2b, and a light-transmitting opening at the bottom of the upper surface inspection chamber 2a. The first camera 2c and the first light source 2d are used to acquire images of the upper surface of the steel plate through the light-transmitting opening of the upper surface inspection chamber 2a.

[0025] The lower inspection unit 3 includes a lower inspection chamber 31 arranged below the inspection roller conveyor 1, and a lower observation box 32, a second camera 33, a second light source 34, a dust removal device 35, and a sliding device 36 arranged in the lower inspection chamber 31.

[0026] The lower inspection chamber 31 has an observation port at the top that is aligned with the observation channel. The lower observation box 32 has an opening at the top and is covered over the observation port to form a seal. It has a light-transmitting opening at the bottom. The second camera 33 and the second light source 34 are located below the lower observation box 32. The second camera 33 and the second light source 34 are used to collect images of the lower surface of the steel plate through the light-transmitting opening, the observation port, and the observation channel 1a of the lower observation box 32 in sequence.

[0027] In this embodiment, to achieve a good sealing and heat insulation effect, such as Figure 4 As shown, the light-transmitting openings on the upper inspection chamber 2a and the lower observation box 32 are both sealed with glass 4.

[0028] In this embodiment, a dust removal structure is provided to prevent dust accumulation from covering the light-transmitting glass of the lower inspection surface. For example... Figures 3-5 As shown, the dust removal device includes a dust removal pipe 35a and a suction gun 35b. A notch is provided on the side of the lower observation box 32. One end of the dust removal pipe 35a is connected to an external dust collector, and the other end is connected to the suction gun 35b. The suction gun 35b extends through the notch to above the light-transmitting opening of the lower observation box 32. Simultaneously, to prevent dust from entering the lower inspection chamber from the lower observation box, a brush 7 is installed on the notch of the lower observation box 32.

[0029] In this embodiment, to facilitate the simultaneous acquisition of images of the lower surface of steel plates of different widths, multiple second cameras 33 are arranged vertically side by side, and each second camera 33 acquires images of the lower surface of the steel plate through a light-transmitting port of the lower observation box 32. Specifically, in this embodiment, four second cameras are set up, and a strip light source is used as the second light source 34.

[0030] In addition, to ensure the dust removal device meets usage requirements, a longitudinal reciprocating motion mechanism is incorporated: such as... Figure 3 , 6 As shown, the sliding device 36 includes a bracket 36a, a cylinder 36b, a connecting plate 36c, a base plate 36d, a fixing block 36e, a sliding rod 36f, and a slider 36g. The number of the dust removal device 35, the notch in the lower observation box 32, and the fixing blocks 36e correspond one-to-one. The bracket 36a is fixed inside the lower inspection chamber 31. The fixed end of the cylinder 36b is connected to the bracket 36a, and the output end is connected to the connecting plate 36c. The sliding rod 36f is fixed to the bracket 36a, and the slider 36g is mounted on the sliding rod 36f. The top of the connecting plate 36c is fixed to the slider 36g, the side wall is fixed to the cylinder 36b, and the bottom is connected to the base plate 36d. Fixing blocks 36e are fixed on the base plate 36d, and each fixing block 36e is fixed to a suction gun 35b. The cylinder 36b drives the base plate 36d to move longitudinally through the connecting plate 36c, causing the suction gun 35b to reciprocate and suction dust above the light-transmitting opening of the lower observation box 32.

[0031] The first camera 2c, the first light source 2d, the second camera 33, the second light source 34, the suction gun 35b, the cylinder 36b, the counter 5, and the laser sensor 6 are respectively associated with the control system signals.

[0032] In this embodiment, in order to precisely control the camera's startup, such as Figure 2 As shown, a camera start-up structure is set up: the counter 5 is connected to the driven roller 1b by a signal. When the steel plate passes through the driven roller 1b and drives it to rotate, the driven roller sends a signal to the counter, and the counter feeds back the start signal to the control system.

[0033] In this embodiment, in order to shut down the camera during the transmission gap between the two steel plates and avoid invalid photos from occupying storage and computing power, a camera shut-off structure is set up: the laser sensor 6 is set between the upper inspection 2 and the lower inspection 3, and is located on the side of the inspection roller 1. The height of the laser sensor 6 corresponds to the steel plate on the inspection roller 1, so as to detect whether there is a steel plate between the upper inspection 2 and the lower inspection 3.

[0034] When the detection system of the embodiment is used, the steel plate is directly conveyed to the detection roller way through the rolling roller way after rolling, and when reaching the driven roller 1b, the driven roller 1b is driven to rotate, the starting signal is received by the counter, and the synchronous feedback is given to the control system, and the control system signal controls the first camera 2c, the first light source 2d, the second camera 33, the second light source 34, the suction gun 35b and the cylinder 36b to start.

[0035] When the image of the upper surface of the steel plate is collected, the first camera 2c and the first light source 2d are started, and the image of the upper surface of the steel plate is collected directly through the light transmission port of the upper surface detection chamber 2a.

[0036] When the image of the upper surface of the steel plate is collected, the second camera 33 and the second light source 34 are started, and the image of the lower surface of the steel plate is collected through the light transmission port, the observation port and the observation channel on the detection roller way of the lower observation box in sequence.

[0037] When the dust is cleaned, the suction gun 35b and the cylinder 36b are started synchronously, the cylinder 36b drives the suction gun 35b on the fixed block 36e to reciprocate on the glass 4 of the lower observation box 32 through the longitudinal reciprocating motion of the bottom plate 36d, so as to prevent the glass 4 from being covered by dust and affecting the image collection of the second camera 33 and the second light source 34.

[0038] When the system needs to be closed, that is, a group of steel plates complete image collection or reach the gap position between two steel plates, the laser sensor 6 identifies whether there is a steel plate in the detection position and feeds back the signal to the control system, so as to close the system in time.

[0039] The detection system of the embodiment synchronously realizes the image recognition of the upper and lower surfaces of the steel plate, realizes the online detection of the steel plate in the motion state, and significantly improves the recognition efficiency. At the same time, the sealing, heat insulation and dust removal structure is added, which greatly reduces the influence of the harsh environment under the hot rolling condition on the system.

Claims

1. A system for detecting surface defects of a hot-rolled plate, characterized by: The utility model provides a steel plate surface inspection device, including detection roller (1), upper surface inspection (2), lower surface inspection (3), control system, the detection roller (1) is opened the observation passageway (1a) of upper and lower through -going on, the upper surface inspection (2) including the upper surface inspection room (2a) of arrangement in the detection roller (1) upper, the upper sealing box (2b) of setting in the upper surface inspection room (2a), the first camera (2c) and first light source (2d) of setting in the upper sealing box (2b), the upper surface inspection room (2a) bottom is opened the light -transmitting port, the lower surface inspection (3) including the lower surface inspection room (31) of arrangement in the detection roller (1) below, the second camera (33) is set in the lower observation box (32) of lower surface inspection room (31), second light source (34), the lower surface inspection room (31) top is opened with the observation passageway alignment's observation port, the lower observation box (32) top is opened and covers the observation port and forms the sealing, bottom is opened the light -transmitting port, the second camera (33), second light source (34) are located the lower observation box (32) below, the light -transmitting port on the upper surface inspection room (2a), lower observation box (32) is sealed through glass (4);Steel plate is conveyed on the detection roller (1), the first camera (2c), first light source (2d) are used for the upper surface image of steel plate collection through the light -transmitting port of upper surface inspection room (2a), the second camera (33), second light source (34) are used for sequentially through the light -transmitting port of lower observation box (32), observation port, observation passageway (1a) and gather the image of steel plate lower surface, the first camera (2c), first light source (2d), second camera (33), second light source (34) are signal associated with control system respectively, still including counter (5), the detection roller (1) includes the driven roller (1b) of setting between the upper surface inspection (2) and lower surface inspection (3), the counter (5) is signal connected with the driven roller (1b), and is signal associated with control system, the lower surface inspection still includes slip device (36), dust cleaning device (35), the slip device (36) includes support (36a), pneumatic cylinder (36b), connecting plate (36c), bottom plate (36d), fixed block (36e), the dust cleaning device includes dust removal pipeline (35a), suction gun (35b), the dust cleaning device (35), lower observation box (32) gap, the number of fixed block (36e) one -to -one correspondence, the support (36a) is fixed in lower surface inspection room (31), the fixed end of pneumatic cylinder (36b) is connected support (36a), and the output end is connected connecting plate (36c), connecting plate (36c) connects bottom plate (36d), and the fixed block (36e) is fixed on bottom plate (36d), and each fixed block (36e) is fixed suction gun (35b) respectively.The air cylinder (36b) is associated with the control system signal, the air cylinder (36b) drives the bottom plate (36d) to move longitudinally through the connecting plate (36c), and drives the suction gun (35b) to reciprocate above the light transmission port of the lower observation box (32).

2. The system for detecting surface defects of a hot-rolled plate according to claim 1, characterized in that: Also include a laser sensor (6), the laser sensor (6) is arranged between the upper surface detection (2) and the lower surface detection (3), and is located in the side of the detection roller (1), the laser sensor (6) is set up height and the steel plate on the detection roller (1) corresponds, to detect whether there is a steel plate between the upper surface detection (2) and the lower surface detection (3); The laser sensor (6) is associated with the control system signal.

3. The system for detecting surface defects of a hot-rolled plate according to claim 1, characterized in that: The lower observation box (32) is provided with a notch on the side, one end of the dust removal pipeline (35a) is connected with an external dust remover, the other end is connected with the suction gun (35b), the suction gun (35b) passes through the notch and extends to above the light transmission port of the lower observation box (32); The suction gun (35b) is associated with the control system signal.

4. The system for detecting surface defects of a hot-rolled plate according to claim 3, characterized in that: The second camera (33) is longitudinally arranged in parallel, and each second camera (33) collects the image of the lower surface of the steel plate through a light transmission port of the lower observation box (32).

5. The system for detecting surface defects of a hot-rolled plate according to claim 1, characterized in that: The sliding device (36) further comprises a sliding rod (36f) and a sliding block (36g), the sliding rod (36f) is fixed on the support (36a), the sliding block (36g) is installed on the sliding rod (36f), the top of the connecting plate (36c) is fixedly connected with the sliding block (36g), and the side wall is fixedly connected with the air cylinder (36b).

6. The system for detecting surface defects of a hot-rolled plate according to claim 3, characterized in that: The lower observation box (32) is provided with a notch on the side, one end of the dust removal pipeline (35a) is connected with an external dust remover, the other end is connected with the suction gun (35b), the suction gun (35b) passes through the notch and extends to above the light transmission port of the lower observation box (32); The suction gun (35b) is associated with the control system signal.

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