Product defect detection device for hot rolling line and hot rolling line

Abstract

The present invention relates to a product defect detection device for a hot rolling line, comprising: a heat-insulating cabinet having a product channel and a heat-resistant window arranged facing the product channel, in which the product channel is arranged to permit a rolled product produced by the hot rolling line and still having waste heat to pass therethrough; the visual mechanism is arranged in the heat insulation case and obtains a product image of the rolled product through the heat-resistant window when the rolled product passes through the product channel; and the control unit is arranged in or outside the heat insulation case and is electrically connected with the visual mechanism, so that whether the rolled product has product defects or not can be identified based on the product image. The product defect detection device can automatically, efficiently, timely and accurately detect product defects of rolled products, provides timely feedback for finding and eliminating abnormities existing on a hot rolling line, and is beneficial to reducing the total quantity of unqualified products produced by the hot rolling line.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of hot rolling lines. More specifically, the present invention relates to a product defect detection device for a hot rolling line and a hot rolling line. Background Art

[0002] In modern industrial production, hot rolling lines are mainly used to produce rolled products such as plates, coils, pipes and bars made of metal materials (such as steel or copper). These rolled products are widely used in many fields such as automobile manufacturing, building construction, machinery manufacturing, etc. Their quality not only affects the service life and safety of the products, but is also directly related to the market competitiveness and economic benefits of manufacturers.

[0003] However, rolled products usually carry a certain amount of residual heat (between 650°C and 1200°C) during the production process, and there may be defects such as cracks and scale on the surface. Traditional product defect detection methods mainly rely on manual visual inspection of surface defects, but this method is inefficient and difficult to ensure the accuracy and consistency of the test results. In addition, since it is necessary to wait for the rolled products to cool to room temperature before detailed inspection, this detection method has significant lag, making it difficult to detect and eliminate abnormalities in the hot rolling line in real time, which invisibly increases the output of defective products. Summary of the invention

[0004] In order to solve one or more of the technical problems mentioned above, the present invention provides a product defect detection device for a hot rolling line and a hot rolling line comprising the same. The product defect detection device can automatically, efficiently, timely and accurately detect product defects of rolled products, and provide timely feedback for discovering and eliminating abnormalities on the hot rolling line, which is conducive to reducing the total amount of defective products produced by the hot rolling line.

[0005] According to a first aspect of the present invention, there is provided a product defect detection device for a hot rolling line, comprising: an insulated chassis having a product channel and a heat-resistant window arranged facing the product channel, wherein the product channel is configured to allow rolled products produced by the hot rolling line and still having residual heat to pass therethrough; a visual mechanism, which is disposed in the insulated chassis and acquires a product image of the rolled product through the heat-resistant window when the rolled product passes through the product channel; a control unit, which is disposed in or outside the insulated chassis and is electrically connected to the visual mechanism, so as to be able to identify whether the rolled product has a product defect based on the product image.

[0006] Furthermore, the heat-insulating chassis includes a chassis body having the product channel and the heat-resistant window, and a heat-insulating interlayer filled between the outer wall and the inner wall of the chassis body.

[0007] Furthermore, the product defect detection device also includes a non-contact speed meter disposed in the heat-insulating chassis and measuring the moving speed of the rolled product through the heat-resistant window. The control unit is electrically connected to the non-contact speed meter and determines the length dimension of the rolled product and the opening and closing timing of the visual mechanism based on the measurement results of the non-contact speed meter.

[0008] Furthermore, the insulated chassis also includes a liquid cooling coil, a liquid cooling plate and / or an air cooling component, wherein the liquid cooling coil is fixedly arranged in the insulated chassis and is used to receive and transport cooling liquid, the liquid cooling plate is arranged on the visual mechanism and is used to receive and transport cooling liquid, and the air cooling component includes an air cooling inlet and an air cooling outlet which are arranged at intervals on the insulated chassis and are both connected to the interior of the insulated chassis.

[0009] Furthermore, the product defect detection device also includes an air-cooling supply unit and / or a liquid-cooling supply unit, the air-cooling supply unit including a fan arranged outside the insulated chassis, an air supply pipeline connecting the air outlet of the fan with the air-cooling inlet, and an exhaust pipeline connected to the air-cooling outlet, and the liquid-cooling supply unit including a water chiller arranged outside the insulated chassis, a liquid supply pipeline that runs through the insulated chassis and connects the liquid outlet of the water chiller with the inlet of the liquid-cooling coil and the inlet of the liquid-cooling plate, and a return pipeline that runs through the insulated chassis and connects the return liquid port of the water chiller with the outlet of the liquid-cooling coil and the outlet of the liquid-cooling plate.

[0010] Furthermore, the product defect detection device also includes a frame arranged in the insulated chassis and used to support the insulated chassis and the liquid cooling coil, and an annular plate arranged on the frame and used to install the visual mechanism, wherein the central axis of the hollow area of ​​the annular plate is collinear with the central axis of the product channel of the insulated chassis, and an insulating pad is provided at the connection between the frame and the annular plate and / or at the connection between the visual mechanism and the annular plate.

[0011] Furthermore, there are multiple heat-resistant windows, which are surrounded by the product channel and evenly arranged along the circumference of the product channel. The visual mechanism includes multiple three-dimensional cameras arranged on the annular plate and opposite to the multiple heat-resistant windows one by one, wherein each of the three-dimensional cameras is electrically connected to the control unit, so that the control unit can identify whether the rolled product has product defects based on the shooting results of all the three-dimensional cameras.

[0012] Furthermore, the product defect detection device also includes a multi-axis motion platform connected to and supporting the insulation chassis, and a plurality of linear drives arranged on the annular plate and used to install the three-dimensional cameras one by one. The multi-axis motion platform is used to adjust the position of the insulation chassis so that the product channel of the insulation chassis can be coaxial with the rolled product. Each of the linear drives can adjust the position of the corresponding three-dimensional camera, thereby ensuring that the distance from each three-dimensional camera to the central axis of the product channel is equal.

[0013] Furthermore, the product defect detection device also includes an air injection component disposed on the heat-insulating chassis and used for spraying the heat-resistant window.

[0014] According to the second aspect of the present invention, there is provided a hot rolling line, which includes a main machine for producing rolled products, a conveyor group for receiving the rolled products output by the main machine and conveying them, and a product defect detection device as described in the first aspect of the present invention, wherein the conveyor group includes a plurality of conveyors arranged in sequence along a direction away from the main machine and jointly conveying the rolled products, and the product defect detection device is arranged between any two adjacent conveyors.

[0015] In the product defect detection device for hot rolling line and the hot rolling line including the same as provided above, the product defect detection device is directly applied in the hot rolling line, and the visual mechanism is contained and protected by an insulated chassis to reduce the damage caused to the rolled product by the residual heat, so that the visual mechanism can work efficiently and stably in the appropriate temperature environment provided by the insulated chassis and obtain the product image of the rolled product with residual heat, thereby ensuring that the control unit can accurately identify whether there are product defects in the rolled product based on the product image, especially surface defects such as cracks, scratches and oxide scale. In this way, the product defect detection device can automatically, efficiently, timely and accurately detect the product defects of the rolled product, and provide more timely feedback for discovering and eliminating abnormalities on the hot rolling line, which is conducive to reducing the total amount of defective products produced by the hot rolling line. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 A schematic structural diagram of a hot rolling line according to an embodiment of the present invention is shown; Figure 2 A three-dimensional diagram showing a product defect detection device for a hot rolling line according to an embodiment of the present invention; Figure 3 Shows Figure 2 The external structure of the heat-insulated chassis of the product defect detection device shown; Figure 4 Shows Figure 2 The internal structure of the heat-insulated chassis of the product defect detection device shown; and Figure 5 Shows Figure 2 The assembly relationship of the visual mechanism and liquid cooling plate of the product defect detection device is shown.

[0017] Explanation of the accompanying drawings: 1. Insulated chassis; 11. Chassis body; 111. Product channel; 112. Heat-resistant window; 12. Insulated interlayer; 13. Frame; 14. Ring plate; 2. Visual mechanism; 21. Three-dimensional camera; 22. Linear drive; 3. Control unit; 41. Air cooling assembly; 411. Air cooling inlet; 412. Air cooling outlet; 51. Liquid cooling coil; 52. Liquid cooling plate; 7. Multi-axis motion platform; 8. Jet component; 9. Non-contact tachometer; 100. Product defect detection device; 200. Hot rolling line; 201. Main machine; 202. Conveyor unit; 2021. Conveyor; 300. Rolled product. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0019] Figure 1 FIG. 2 shows a schematic diagram of the structure of a hot rolling line according to an embodiment of the present invention. Figure 1 As shown, the hot rolling line 200 mainly includes rolled products 300 such as plates, coils, pipes and bars of metal materials (such as steel or copper), which are widely used in automobile manufacturing, building construction, machinery manufacturing and other fields. The hot rolling line 200 includes a main machine 201 for producing rolled products 300, and a conveyor group 202 for receiving and conveying the rolled products 300 output by the main machine 201. The conveyor group 202 includes a plurality of conveyors 2021 arranged in sequence in a direction away from the main machine 201 and conveying the rolled products 300 together. Among them, the main machine 201 should be selected according to the type of rolled products 300. For example, when the rolled products 300 are pipes, the main machine 201 should be selected as a pipe mill, and when the rolled products 300 are pipes, the main machine 201 should be selected as a plate mill.

[0020] The hot rolling line 200 further includes a product defect detection device 100 disposed between any two adjacent conveyors 2021. Figure 1 and Figure 2 As shown, the product defect detection device 100 includes an insulated chassis 1. The insulated chassis 1 has a product channel 111 and a heat-resistant window 112 arranged facing the product channel 111, wherein the product channel 111 is configured to allow the rolled product 300 produced by the hot rolling line 200 and still having residual heat to pass therethrough. For example, the insulated chassis 1 is presented as a box structure with a central hole (i.e., the product channel 111) and is arranged between adjacent conveyors 2021, so that the rolled product 300 gradually passes through the product channel 111 of the insulated chassis 1 under the conveying action of the conveyor 2021. The heat-resistant window 112 is made of glass with good high temperature resistance such as quartz glass or tempered glass, and is sealed and fixed in a window reserved on the insulated chassis 1 to ensure that the visual inspection and speed measurement processes can be implemented normally.

[0021] The product defect detection device 100 includes a visual mechanism 2 disposed in an insulated chassis 1 and a control unit 3 electrically connected to the visual mechanism 2. The visual mechanism 2 can obtain a product image of the rolled product 300 through the heat-resistant window 112 when the rolled product 300 passes through the product channel 111, so that the control unit 3 can identify whether the rolled product 300 has product defects based on the product image, especially surface defects such as cracks, scratches and oxide scale. The insulated chassis 1 has a good heat insulation effect, which can effectively reduce the risk of overheating damage to the visual mechanism 2 due to the heat radiation of the rolled product 300. At the same time, the control unit 3 can also be arranged in the insulated chassis 1, or at a position away from the hot rolling line 200 and penetrate the insulated chassis 1 and connect the visual mechanism 2 through a cable assembly buried underground. This method can also reduce the risk of overheating damage to the control unit 3 due to the heat radiation of the rolled product 300.

[0022] As for the specific implementation method, the control unit 3 mentioned above generally includes a processor (such as a GPU or a CPU), a memory, and electronic components connected to the processor, etc., which are well known to those skilled in the art and will not be described in detail here. However, it should be noted that the number of processors, memories, and necessary electronic components is not limited, and can be adjusted according to actual needs. For example, when it is necessary to disassemble the control unit 3 into multiple control modules, the multiple control modules respectively perform different tasks of the control unit 3, and communicate and collaborate to complete one or more tasks when necessary. When in use, the control unit 3 can identify the product image based on a pre-trained neural network, and determine whether the rolled product 300 has defects and the location and type of the defects, etc., wherein the training of the neural network can be obtained based on conventional training methods, which is a technology well known to those skilled in the art and will not be repeated here.

[0023] In the hot rolling line 200 as described above, the product defect detection device 100 can accommodate and protect the visual mechanism 2 through the heat-insulating chassis 1 to reduce the damage caused to the rolled product 300 by the residual heat, so that the visual mechanism 2 can work efficiently and stably in the appropriate temperature environment provided by the heat-insulating chassis 1 and obtain the product image of the rolled product 300 with residual heat, thereby ensuring that the control unit 3 can accurately identify whether the rolled product 300 has product defects based on the product image, especially the surface defects. In this way, the product defect detection device 100 used in the hot rolling line 200 can automatically, efficiently, timely and accurately detect the product defects of the rolled product 300, and provide more timely feedback for discovering and eliminating abnormalities on the hot rolling line 200, which is conducive to reducing the total amount of defective products produced by the hot rolling line 200.

[0024] like Figure 2 and Figure 3 As shown, the heat-insulating chassis 1 includes a chassis body 11 having a product channel 111 and a heat-resistant window 112, and a heat-insulating interlayer 12 filled between the outer wall and the inner wall of the chassis body 11. The material of the heat-insulating interlayer 12 is preferably a material with high heat-insulating properties and high temperature resistance, such as aluminum silicate fiber, vacuum insulation board or fireproof cotton. The chassis body 11 can effectively block the external heat (mainly from the waste heat of the rolled product 300) from being conducted to the inside thereof through the heat-insulating interlayer 12 arranged therein, keep the temperature inside the chassis body 11 always at a relatively low state (for example, below 45°C), protect the visual mechanism 2 and other structures (such as the control unit 3 arranged therein), and extend their service life.

[0025] like Figure 3 , Figure 4 and Figure 5As shown, in order to further reduce the adverse effects of the residual heat of the rolled product 300 on the visual mechanism 2 and other structures in the insulated chassis 1, the insulated chassis 1 also includes an air cooling component 41, a liquid cooling coil 51 and / or a liquid cooling plate 52. Among them, the air cooling component 41 includes an air cooling inlet 411 and an air cooling outlet 412 which are arranged on the insulated chassis 1 at intervals and are both connected to the inside of the insulated chassis 1. Therefore, when air or other cooling gas enters the insulated chassis 1 through the air cooling inlet 411 and then leaves the insulated chassis 1 through the air cooling outlet 412, it can take away the heat in the insulated chassis 1 and maintain the temperature in the chassis body 11 at a lower and more stable state, so as to better protect the visual mechanism 2 and other structures in the insulated chassis 1. At the same time, the liquid cooling coil 51 is fixedly arranged in the insulated chassis 1 and is used to receive and transport cooling liquid (such as water), while the liquid cooling plate 52 is arranged on the visual mechanism 2, especially on the three-dimensional camera 21 of the visual mechanism 2, and is used to receive and transport cooling liquid. Therefore, when the coolant passes through the liquid cooling coil 51 and the liquid cooling plate 52, it can also take away the heat in the heat-insulating chassis 1. In particular, the coolant flowing through the liquid cooling plate 52 can take away the heat in the visual mechanism 2, thereby maintaining the temperature in the chassis body 11 at a lower and more stable state, thereby better protecting the visual mechanism 2 and other structures in the heat-insulating chassis 1. Whether to use the air cooling component 41, the liquid cooling coil 51 and the liquid cooling plate 52 should be determined in combination with the residual heat of the rolled product 300. For example, when the residual heat of the rolled product 300 is about 1100°C, the heat-insulating chassis 1 needs to use the air cooling component 41, the liquid cooling coil 51 and the liquid cooling plate 52 in addition to the heat-insulating interlayer 12.

[0026] In this embodiment, the product defect detection device 100 may also include an air-cooling supply unit and / or a liquid-cooling supply unit. The liquid-cooling supply unit includes a water chiller (not shown) disposed outside the heat-insulating chassis 1, a liquid supply pipeline that runs through the heat-insulating chassis 1 and connects the liquid outlet of the water chiller to the inlet of the liquid-cooling coil 51 and the inlet of the liquid-cooling plate 52, and a return pipeline that runs through the heat-insulating chassis 1 and connects the return liquid port of the water chiller to the outlet of the liquid-cooling coil 51 and the outlet of the liquid-cooling plate 52. The water chiller can cyclically provide cooling liquid (such as water) to the liquid-cooling coil 51 and the liquid-cooling plate 52 through the liquid supply pipeline and the return pipeline to ensure that both can play a cooling role. The air-cooling supply unit includes a fan disposed outside the heat-insulating chassis 1, an air supply pipeline for connecting the air outlet of the fan to the air-cooling inlet 411, and an exhaust pipeline for connecting to the air-cooling outlet 412. The fan can deliver cooler air or other gas into the insulated chassis 1 through the air supply pipeline and the air cooling inlet 411, and then discharge it to the outside of the insulated chassis 1 through the air cooling outlet 412 and the exhaust pipeline, ensuring that the air or other gas flowing through the insulated chassis 1 can smoothly take away the heat in the insulated chassis 1.

[0027] It should be emphasized that if the hot rolling line 200 or the workshop where it is located originally has an air cooling supply unit and / or a liquid cooling supply unit, then the product defect detection device 100 does not need to be additionally configured with an air cooling supply unit and / or a liquid cooling supply unit, and can directly use the original air cooling supply unit and / or liquid cooling supply unit.

[0028] Furthermore, the product defect detection device 100 also includes a temperature sensor disposed in the inner cavity of the heat-insulating chassis 1 and used to measure the air temperature. The fan and the temperature sensor can communicate through wireless communication or cables buried underground, so that the fan can autonomously change the working state and operating power based on the temperature measurement result of the temperature sensor. For example, when the detection temperature of the temperature sensor reaches the first set temperature (such as 30°C), the fan automatically starts to run, and increases its own operating power as the detection temperature increases until the maximum operating power is reached. When the detection temperature of the temperature sensor is lower than the first set temperature, the fan automatically starts to run. Similarly, the chiller and the temperature sensor can also communicate through wireless communication or cables buried underground, so that the chiller can control the working state and operating power based on the temperature measurement result of the temperature sensor. For example, when the detection temperature of the temperature sensor reaches the second set temperature (such as 40°C), the chiller automatically starts to run, and increases the operating power as the detection temperature increases until the maximum operating power is reached. When the detection temperature of the temperature sensor is lower than the second set temperature, the chiller automatically shuts down.

[0029] In this embodiment, the product defect detection device 100 may also include a non-contact speed meter 9 which is arranged in the heat-insulating chassis 1 and also measures the moving speed of the rolled product 300 through the heat-resistant window 112. The control unit 3 is electrically connected to the non-contact speed meter 9, and determines the length dimension of the rolled product 300 and the opening and closing timing of the visual mechanism 2 based on the measurement result of the non-contact speed meter 9. The non-contact speed meter 9 can be an electromagnetic speed meter or a laser speed meter, etc., and the moving speed of the rolled product 300 is measured in real time by the non-contact speed meter 9. The control unit 3 can accurately calculate the length dimension of the rolled product 300 (i.e., the speed multiplied by the maintenance time) and identify the size defects of the rolled product 300 based on the measurement result of the non-contact speed meter 9, and can accurately confirm the opening and closing timing of the visual mechanism 2 and implement the automatic start and stop of the visual mechanism 2, so as to ensure that the visual mechanism 2 can accurately collect the rolled product 300 and capture the best product image.

[0030] In this embodiment, the product defect detection device 100 may also include a frame 13 disposed in the heat-insulating chassis 1 and used to support the heat-insulating chassis 1 and the liquid cooling coil 51, and an annular plate 14 disposed on the frame 13 and used to install the visual mechanism 2. The central axis of the hollow area of ​​the annular plate 14 is collinear with the central axis of the product channel 111 of the heat-insulating chassis 1, ensuring that the visual mechanism 2 can more accurately locate and focus on the rolled product 300 in the product channel 111. As a preferred example, a heat-insulating cushion layer may also be provided at the connection between the frame 13 and the annular plate 14 and / or at the connection between the visual mechanism 2 and the annular plate 14. The heat-insulating cushion layer is preferably made of heat-resistant and heat-insulating materials such as heat-insulating cotton, which can effectively reduce the heat transferred from the frame 13 to the annular plate 14, and / or the heat transferred from the annular plate 14 to the visual mechanism 2, thereby ensuring that the visual mechanism 2 can operate stably and reliably in a lower temperature environment.

[0031] In this embodiment, in order to perform a more comprehensive defect detection on the rolled product 300, the number of heat-resistant windows 112 can be selected to be multiple, and the multiple heat-resistant windows 112 surround the product channel 111 and are evenly arranged along the circumference of the product channel 111. At the same time, the visual mechanism 2 includes a plurality of three-dimensional cameras 21 arranged on the annular plate 14 and corresponding to the multiple heat-resistant windows 112 one by one, wherein each three-dimensional camera 21 is electrically connected to the control unit 3, so that the control unit 3 can identify whether the rolled product 300 has a product defect based on the shooting results of all three-dimensional cameras 21. In terms of a specific implementation method, the control unit 3 can identify and determine whether different positions of the same rolled product 300 have a product defect one by one based on the shooting results of all three-dimensional cameras 21. In addition, the control unit 3 can also obtain a composite image including a complete rolled product 300 based on the shooting results of all three-dimensional cameras 21, and then comprehensively identify whether the rolled product 300 has a product defect based on the composite image.

[0032] return Figure 2 The product defect detection device 100 also includes a multi-axis motion platform 7 disposed between adjacent conveyors 2021 and used to connect and support the heat-insulating chassis 1. The multi-axis motion platform 7 can adjust the position of the heat-insulating chassis 1 under the control of the control unit 3 or under its own control, so that the product channel 111 of the heat-insulating chassis 1 can be coaxial with the rolled product 300, so as to improve the detection precision and accuracy of the visual mechanism 2. At the same time, the product defect detection device 100 also includes a plurality of linear actuators 22 (preferably electric slides) disposed on the annular plate 14 and used to install the three-dimensional camera 21, see Figure 4 and Figure 5 Each linear actuator 22 can adjust the position of the corresponding 3D camera 21 , thereby ensuring that the distances between each 3D camera 21 and the central axis of the product channel 111 are equal, and facilitating further improving the detection precision and accuracy of the 3D camera 21 .

[0033] In this embodiment, the product defect detection device 100 further includes an air injection component 8 disposed on the heat-insulating chassis 1 and used for blowing the heat-resistant window 112, see Figure 3 The jet component 8 is preferably an air nozzle assembly or an air knife, which can receive high-pressure gas and use the jetted gas to clean the heat-resistant window 112. As an example, the jet component 8 is connected to the above-mentioned fan, so that the fan can provide high-pressure and low-temperature gas to the jet component 8, thereby not only cleaning the heat-resistant window 112, but also cooling the heat-resistant window 112.

[0034] In summary, the hot rolling line 200 applies an innovative product defect detection device 100, and the product defect detection device 100 can automatically, efficiently, timely and accurately detect product defects of the rolled product 300, and provide timely feedback for discovering and eliminating abnormalities on the hot rolling line 200, which is beneficial to reducing the total amount of defective products produced by the hot rolling line 200.

[0035] In the above description of the present application, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" and the like should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in the present application, those skilled in the art can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0036] According to the above description of the present application, those skilled in the art may also understand that the terms used below, such as "upper", "lower", and the like, indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings of the present application, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0037] In addition, the terms "first" or "second" used in this application to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0038] Although multiple embodiments of the present invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art may conceive of many changes, modifications, and alternatives without departing from the thought and spirit of the present invention. It should be understood that in the process of practicing the present invention, various alternatives to the embodiments of the present invention described herein may be adopted. The appended claims are intended to define the scope of protection of the present invention, and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A product defect detection device for a hot rolling line, characterized in that: include: an insulated cabinet having a product passage and a heat-resistant viewing window arranged facing the product passage, wherein the product passage is configured to allow the rolled products produced by the hot rolling line and still having residual heat to pass therethrough; A visual mechanism, which is disposed in the heat-insulating cabinet and acquires a product image of the rolled product through the heat-resistant window when the rolled product passes through the product passage; as well as A control unit is arranged inside or outside the heat-insulating cabinet and is electrically connected to the visual mechanism, so as to identify whether the rolled product has a product defect based on the product image.

2. The product defect detection device according to claim 1, characterized in that: The heat-insulating chassis comprises a chassis body having the product channel and a heat-resistant window, and a heat-insulating interlayer filled between an outer wall and an inner wall of the chassis body.

3. The product defect detection device according to claim 1, characterized in that: It also includes a non-contact speed meter that is arranged in the insulated chassis and measures the moving speed of the rolled product through the heat-resistant window. The control unit is electrically connected to the non-contact speed meter and determines the length of the rolled product and the opening and closing timing of the visual mechanism based on the measurement results of the non-contact speed meter.

4. The product defect detection device according to any one of claims 1 to 3, characterized in that: The insulated chassis also includes a liquid cooling coil, a liquid cooling plate and / or an air cooling component, wherein the liquid cooling coil is fixedly arranged in the insulated chassis and is used to receive and transport cooling liquid, the liquid cooling plate is arranged on the visual mechanism and is used to receive and transport cooling liquid, and the air cooling component includes an air cooling inlet and an air cooling outlet which are arranged at intervals on the insulated chassis and are both connected to the interior of the insulated chassis.

5. The product defect detection device according to claim 4, characterized in that: It also includes an air-cooling supply unit and / or a liquid-cooling supply unit, wherein the air-cooling supply unit includes a fan arranged outside the insulated chassis, an air supply pipeline connecting the air outlet of the fan with the air-cooling inlet, and an exhaust pipeline connected to the air-cooling outlet; the liquid-cooling supply unit includes a water chiller arranged outside the insulated chassis, a liquid supply pipeline that runs through the insulated chassis and connects the liquid outlet of the water chiller with the inlet of the liquid-cooling coil and the inlet of the liquid-cooling plate, and a return pipeline that runs through the insulated chassis and connects the return liquid outlet of the water chiller with the outlet of the liquid-cooling coil and the outlet of the liquid-cooling plate.

6. The product defect detection device according to claim 4, characterized in that: It also includes a frame arranged in the insulated chassis and used to support the insulated chassis and the liquid cooling coil, and an annular plate arranged on the frame and used to install the visual mechanism, wherein the central axis of the hollow area of ​​the annular plate is colinear with the central axis of the product channel of the insulated chassis, and an insulating pad is provided at the connection between the frame and the annular plate and / or at the connection between the visual mechanism and the annular plate.

7. The product defect detection device according to claim 6, characterized in that: There are multiple heat-resistant windows, which are surrounded by the product channel and evenly arranged along the circumference of the product channel. The visual mechanism includes multiple three-dimensional cameras arranged on the annular plate and opposite to the multiple heat-resistant windows one by one, wherein each of the three-dimensional cameras is electrically connected to the control unit, so that the control unit can identify whether the rolled product has product defects based on the shooting results of all the three-dimensional cameras.

8. The product defect detection device according to claim 7, characterized in that: It also includes a multi-axis motion platform connecting and supporting the insulation chassis, and a plurality of linear drives arranged on the annular plate and used to install the three-dimensional cameras one by one. The multi-axis motion platform is used to adjust the position of the insulation chassis so that the product channel of the insulation chassis can be coaxial with the rolled product. Each of the linear drives can adjust the position of the corresponding three-dimensional camera, thereby ensuring that the distance from each three-dimensional camera to the central axis of the product channel is equal.

9. The product defect detection device according to any one of claims 1 to 3, characterized in that: It also includes an air injection component which is arranged on the heat-insulating chassis and is used for blowing the heat-resistant window.

10. A hot rolling line, characterized in that: The hot rolling line includes a main machine for producing rolled products, a conveyor group for receiving the rolled products output by the main machine and conveying them, and a product defect detection device as described in any one of claims 1 to 9, wherein the conveyor group includes a plurality of conveyors arranged in sequence in a direction away from the main machine and jointly conveying the rolled products, and the product defect detection device is arranged between any two adjacent conveyors.

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