A device for detecting surface defects of cast aluminum core using machine vision assistance

Abstract

The present invention discloses a device for detecting surface defects of a cast aluminum core body assisted by machine vision, and relates to the technical field of visual detection. The detection device comprises a body, a supporting mechanism, a driving box and a movable seat, wherein a mounting seat is arranged on the body, the supporting mechanism is arranged above the mounting seat, and a driving box is arranged on the top of the body. Compared with the current device for detecting surface defects of a cast aluminum core body, the present invention is provided with a moving component and a visual detection component, wherein the moving component enables the visual detection component to move inside a working pipe inside the cast aluminum core body, and the visual detection component can detect the curved inner wall and the plane inner wall of the working pipe, and the cooperation of the moving component and the visual detection component can ensure that the camera is always facing the area to be detected, thereby avoiding the risk of image distortion and inaccurate measurement when the visual detection component detects the plane inner wall of the working pipe.

Description

Technical Field

[0001] The invention relates to the technical field of visual inspection, and in particular to a device for detecting surface defects of a cast aluminum core body using machine vision assistance. Background Art

[0002] Cast aluminum core plays an important role in the field of new energy. Compared with cast iron and other materials, cast aluminum core can not only significantly reduce the weight of equipment and improve the energy efficiency of the overall system, but also has excellent corrosion resistance. However, surface defects such as pores, cracks, inclusions, etc. may appear in the production process of cast aluminum core. These defects not only affect the appearance quality of the product, but more importantly, they may pose a potential threat to the performance and safety of the equipment.

[0003] Current surface defect detection devices for cast aluminum cores usually rely on airtightness detection technology and visual detection technology, but the working area of ​​the cast aluminum core is usually composed of a deeper multi-curved cavity. When using visual detection technology to detect the cast aluminum core, image distortion often occurs, which in turn affects the detection accuracy. Finally, when using airtightness detection technology to detect the cast aluminum core, it is usually necessary to ensure that the upper and lower ends of the cast aluminum core are in a sealed state. The current operation method is to place the cast aluminum core on a workbench and then drive the pressure plate through a cylinder to close to the upper area of ​​the cast aluminum core. However, this operation method has certain hidden dangers. When the staff makes an operating error or other problems, so that the extended length of the cylinder is greater than the distance between the pressure plate and the cast aluminum core, the cast aluminum core is easily damaged due to the greater pressure, and the current cast aluminum core surface defect detection device has no preventive measures for this problem. Summary of the invention

[0004] The object of the present invention is to provide a device for detecting surface defects of a cast aluminum core body using machine vision to solve the problems raised in the prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a surface defect detection device for a cast aluminum core body assisted by machine vision, the detection device comprising a body, a support mechanism, a drive box and a movable seat, the body is provided with a mounting seat, the support mechanism is provided above the mounting seat, the top of the body is provided with a drive box, the bottom of the drive box is provided with a movable seat, the drive box and the movable seat are connected by a lifting assembly, a pressure plate is provided on the side of the movable seat close to the support mechanism, the movable seat and the pressure plate are connected by a connecting rod, and a power is provided inside the drive box in the present invention. The support mechanism is a support mechanism for supporting a movable seat and a pressure plate, and a movable assembly and a lifting assembly are used to drive the movable seat and the pressure plate to rise and fall. A moving assembly and a visual inspection assembly are provided at the lower end of the support mechanism. A working pipe is provided inside the cast aluminum core, and the working pipe is the main working area of ​​the cast aluminum core. When inspecting the cast aluminum core for defects, the staff can place the cast aluminum core on the support mechanism, and then drive the visual inspection assembly to move left and right and forward and backward on a horizontal plane through the moving assembly. The inner wall of the working pipe is inspected for defects through the visual inspection assembly to prevent defects such as cracks on the inner wall of the working pipe, which may affect the normal use of the subsequent cast aluminum core.

[0006] Furthermore, a first sealing groove is provided at the outer end of the inner wall of the working pipeline, and the supporting mechanism includes a first supporting seat and a second supporting seat, the second supporting seat is arranged on the first supporting seat, a cavity is provided at the middle position of the upper end of the second supporting seat, a slide is provided inside the second supporting seat, the cavity is aligned with the slide, a transparent glass is provided at the middle position of the slide, a first sealing block is provided at the upper outer end of the cavity, the first sealing block cooperates with the first sealing groove, a second sealing groove is provided at one end of the cast aluminum core body close to the pressing plate, a second sealing block is provided at one end of the pressing plate close to the cast aluminum core body, the second sealing block cooperates with the second sealing groove, a conduit and a through hole are also provided inside the cast aluminum core body, the conduit is connected with the working pipeline, a vent pipe is also provided on the pressing plate, the vent pipe cooperates with the conduit, the vent pipe is connected with an external gas supply device through a hose, and the external gas supply device can select a gas supply device with a pressure detection function or a pressure sensor is provided at one end of the pressing plate close to the cast aluminum core body. Sensor (the functions realized by the gas transmission device and the pressure sensor belong to conventional technical means in this field, and the specific structure is not described). When the cast aluminum core is inspected for defects in the present invention, the staff needs to clamp the first sealing groove on the cast aluminum core on the first sealing block, and the working pipeline is placed in a closed space through the first sealing groove and the first sealing block, and then the movable seat and the pressure plate are driven down by the power source inside the drive box and the lifting assembly until the second sealing block enters the second sealing groove and the ventilation pipe enters the conduit. At this time, the staff can transport a certain amount of gas to the inside of the working pipeline through the external gas transmission device, and by detecting the change of the air pressure inside the working pipeline or detecting the change of the air pressure in the area near the pressure plate inside the cast aluminum core, it can be determined whether the working pipeline has defects such as holes. Finally, in the process of using the airtightness detection technology to detect the working pipeline in the present invention, the moving assembly can synchronously drive the visual detection assembly to move on the horizontal plane, and the visual detection assembly is used to assist the detection, thereby further improving the accuracy of the cast aluminum core detection.

[0007] Furthermore, a working cavity is provided inside the second support seat, the slide is provided in the working cavity, two groups of third linear motors are relatively provided on the inner wall of the working cavity, the working ends of the two groups of third linear motors are connected to the slide, and when the present invention utilizes the air tightness detection technology to detect the working pipeline, the slide is always in a position aligned with the cavity, if the transparent glass on the slide is contaminated, the staff can start the third linear motor after the air tightness detection of the working pipeline is completed, and drive the slide to move in the working cavity by the third linear motor, so as to avoid contamination of the transparent glass on the slide so as to affect the detection accuracy of the visual detection component.

[0008] Furthermore, the moving component includes a first linear motor, a mounting frame and a second linear motor, the first linear motor is provided with two groups, the two groups of the first linear motors are relatively arranged at the front and rear ends inside the first support seat, the mounting frame is arranged between the two groups of the first linear motors, the second linear motor is arranged on the mounting frame, and the visual detection component is arranged on the working end of the second linear motor. When the present invention detects the inner wall of the working pipe through the visual detection component, the staff can drive the visual detection component to move left and right through the first linear motor, and drive the visual detection component to move forward and backward through the second linear motor, so as to perform all-round detection of various areas of the inner wall of the working pipe.

[0009] Furthermore, the visual inspection component includes a fixed table, a turntable, a fixed axis, a first camera and a second camera. A rotating motor is arranged inside the fixed table. The turntable is arranged on the fixed table. The working end of the rotating motor is connected to the turntable. The fixed axis is arranged on the turntable. The first camera is arranged at the upper end of the fixed axis. The second camera is arranged at the side end of the fixed axis. The first camera and the second camera both use cameras with their own light sources. The diameter of the fixed axis is smaller than the diameter of the working pipe. Since the working pipe inside the cast aluminum core body is mostly a curved structure and the working pipe has a large depth, the present invention provides several groups of cylinders inside the mounting frame. The working ends of several groups of cylinders are connected to the second linear motor. After the air tightness inspection of the working pipe is completed, the staff can drive the slide out of the working chamber through the third linear motor, and then drive the visual inspection component to rise to the inside of the working pipe through several groups of cylinders. The visual inspection component is moved inside the working pipe through the first linear motor and the second linear motor. During the movement of the visual inspection component, the turntable is driven to rotate by the rotating motor, the arc-shaped inner wall of the working pipe is inspected by the first camera, and the plane inner wall of the working pipe is inspected by the second camera.

[0010] Furthermore, the inner wall and the outer wall of the first sealing block are both provided with a plurality of exhaust holes, a groove is provided at the middle position of the first sealing block, and the plurality of exhaust holes are connected to the groove, a sensing block is provided in the groove, a first electromagnet is provided below the sensing block, and the end of the sensing block close to the first electromagnet is magnetic. When the present invention performs airtightness detection on the working pipeline, the first electromagnet will generate a group of magnetic fields that repel the sensing block. At this time, the sensing block is stably located at the upper end of the groove, and the plurality of exhaust holes are in a closed state. Since the upper end area of ​​the first sealing block is most susceptible to bumping and wear during operation of the present invention, the present invention provides a pressure detection element at the upper end of the sensing block. When a certain area of ​​the upper end of the first sealing block is damaged due to bumping or wear, the gas inside the working pipeline is When the body leaks from the area between the first sealing groove and the first sealing block, the gas in the working pipeline will first flow through the groove (i.e., the area above the first sealing block). The pressure detection element can facilitate the staff to promptly determine whether the first sealing block can be used normally, so as to facilitate subsequent timely maintenance. Finally, after the present invention has detected the airtightness of the working pipeline, the staff can change the magnetic field of the first electromagnet so that the first electromagnet attracts the sensing block. At this time, the sensing block will move toward the direction of the first electromagnet. Finally, under the action of several groups of exhaust holes, the working pipeline will be connected to other non-main working areas of the cast aluminum core. At this time, if the staff continues to transport a certain amount of gas into the working pipeline through an external gas supply device, it can be determined whether there are defects such as holes and cracks in the non-main working areas of the cast aluminum core by detecting the air pressure changes inside the cast aluminum core.

[0011] Furthermore, the lifting assembly includes a lifting frame, a telescopic rod, a piston and a threaded rod, one end of the telescopic rod is connected to the movable seat, the other end of the telescopic rod is arranged in the lifting frame and is wound with a return spring, the piston is arranged at one end of the telescopic rod located in the lifting frame, an air pump is arranged in the drive box, the air pump is connected to the top of the lifting frame, and a plurality of groups of threaded holes are arranged at the lower end of the lifting frame, and a group of threaded rods are arranged in each group of the threaded holes. Before the present invention works, the staff can first measure the distance between the second sealing block and the second sealing groove, and then rotate the plurality of groups of threaded rods until the distance between the plurality of groups of threaded rods and the piston is equal to the distance between the second sealing block and the second sealing groove. When the present invention needs to detect the surface defects of the cast aluminum core, compressed gas is delivered to the lifting frame by the air pump so that the telescopic rod drives the movable seat and the pressure plate to descend. Compared with the current direct use of components such as cylinders, the present invention can achieve the purpose of limiting through a plurality of groups of threaded rods to prevent the pressure plate from applying excessive force to the cast aluminum core, so as to damage the cast aluminum core.

[0012] Furthermore, under normal circumstances, when the present invention encounters an accident such as a power outage, the reset spring wound on the telescopic rod can drive the movable seat and the pressure plate to reset. However, when working for a long time, the reset spring may be unable to return to its original state due to fatigue. Because the present invention is provided with a plurality of groups of positioning grooves in the movable seat, each group of positioning grooves is provided with a group of connecting rods, each group of positioning grooves is filled with hydraulic oil, and a pressure relief groove is also provided in the movable seat, each group of positioning grooves is connected to the upper end of the pressure relief groove through a drainage channel, and a second electromagnet is provided at the upper end of the pressure relief groove, and a sealing plate is provided below the second electromagnet, and the end of the sealing plate close to the second electromagnet is magnetic. When the present invention is working normally, the second electromagnet always attracts the sealing plate. At this time The sealing plate can be used to block the drainage channel. Since the liquid is incompressible, the pressure plate and the movable seat are in a fixed state. When an accident such as a power outage occurs, the second electromagnet no longer attracts the sealing plate. At this time, several groups of positioning grooves are connected to the pressure relief grooves. The staff only needs to lift the pressure plate to take out the cast aluminum core. Through the above technical scheme, on the one hand, the effort required by the staff to take out the cast aluminum core is reduced. On the other hand, when the staff makes operating errors or other problems, the amount of compressed gas delivered by the air pump to the lifting frame is too large, so that the force applied by the pressure plate on the cast aluminum core exceeds the force of the second electromagnet to attract the sealing plate, the sealing plate will automatically detach from the second electromagnet, thereby achieving the purpose of active decompression and reducing the probability of damage to the cast aluminum core.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: compared with the current cast aluminum core surface defect detection device, the present invention is provided with a moving component and a visual detection component, and the visual detection component is moved inside the working pipe inside the cast aluminum core through the moving component, and the visual detection component can be used to detect the curved inner wall and the plane inner wall of the working pipe. Compared with the current visual detection device, the present invention can ensure that the camera is always facing the area to be detected through the cooperation of the moving component and the visual detection component, avoiding the risk of image distortion and inaccurate measurement when the visual detection component detects the plane inner wall of the working pipe. The present invention is also provided with a sensing block and a first electromagnet, and the movement of the sensing block is controlled by the first electromagnet to detect the air tightness of the working pipe. By using the pressure detection element arranged on the upper end of the sensing block, the staff can judge whether the first sealing block can be used normally in time, so as to facilitate the subsequent timely maintenance. When the air tightness of the working pipeline is detected, the sensing block is moved down by the first electromagnet so that the working pipeline can be connected with other non-main working areas of the cast aluminum core. At this time, if the staff continues to transport a certain amount of gas into the working pipeline through the external gas supply device, it can be judged whether there are defects such as holes and cracks in the non-main working areas of the cast aluminum core by detecting the air pressure changes inside the cast aluminum core. Finally, the present invention is also provided with a lifting assembly. Compared with directly using components such as cylinders, the lifting assembly can avoid excessive force exerted by the pressure plate on the cast aluminum core, so that the cast aluminum core is damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 This is a schematic structural diagram of the cast aluminum core of the present invention from a first viewing angle;

[0016] Figure 3 It is a schematic structural diagram of the cast aluminum core of the present invention from a second viewing angle;

[0017] Figure 4 It is a schematic diagram of the pressing plate structure of the present invention;

[0018] Figure 5 It is a schematic structural diagram of the support mechanism of the present invention from a first viewing angle;

[0019] Figure 6 It is a structural schematic diagram of the support mechanism of the present invention from a second viewing angle;

[0020] Figure 7 is a cross-sectional schematic diagram of the support mechanism of the present invention;

[0021] Figure 8 For the present invention Figure 7 Schematic diagram of the structure of the middle A part;

[0022] Fig. 9 It is a schematic diagram of the structure of the visual detection component of the present invention;

[0023] Fig.10 It is a schematic diagram of the structure of the lifting assembly of the present invention;

[0024] Fig.11 It is a schematic diagram of the internal structure of the movable seat of the present invention.

[0025] In the figure: 1, fuselage; 11, mounting seat; 2, supporting mechanism; 21, first supporting seat; 211, first linear motor; 212, mounting frame; 2121, cylinder; 213, second linear motor; 214, visual inspection component; 2141, fixed table; 2142, turntable; 2143, fixed axis; 2144, first camera; 2145, second camera; 22, second supporting seat; 221, working chamber; 222, third linear motor; 23, slide plate; 24, first sealing block ; 241, induction block; 242, exhaust hole; 243, first electromagnet; 3, cast aluminum core; 31, first sealing groove; 32, working pipeline; 33, conduit; 34, second sealing groove; 4, drive box; 41, lifting frame; 42, telescopic rod; 421, piston; 43, threaded rod; 5, movable seat; 51, connecting rod; 52, pressure plate; 521, second sealing block; 522, ventilation pipe; 53, positioning groove; 54, pressure relief groove; 541, second electromagnet; 542, sealing plate. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example: Figure 1-Figure 7As shown, the present invention provides a technical solution, a surface defect detection device for a cast aluminum core body using machine vision assistance, the detection device comprises a fuselage 1, a support mechanism 2, a drive box 4 and a movable seat 5, a mounting seat 11 is arranged on the fuselage 1, the support mechanism 2 is arranged above the mounting seat 11, a drive box 4 is arranged at the top of the fuselage 1, a movable seat 5 is arranged below the drive box 4, the drive box 4 and the movable seat 5 are connected by a lifting assembly, a pressing plate 52 is arranged on the side of the movable seat 5 close to the support mechanism 2, and the movable seat 5 and the pressing plate 52 are connected by a connecting rod 51, and a power source is arranged inside the drive box 4 in the present invention, and the power source and the lifting assembly are connected. The lowering component drives the movable seat 5 and the pressure plate 52 to rise and fall. The lower end of the support mechanism 2 is provided with a moving component and a visual inspection component 214. The interior of the cast aluminum core 3 is provided with a working pipe 32. The working pipe 32 is the main working area of ​​the cast aluminum core 3. When performing defect inspection on the cast aluminum core 3, the staff can place the cast aluminum core 3 on the support mechanism 2, and then drive the visual inspection component 214 to move left and right and forward and backward on the horizontal plane through the moving component. The inner wall of the working pipe 32 is inspected for defects through the visual inspection component 214 to prevent defects such as cracks on the inner wall of the working pipe 32, which will affect the normal use of the subsequent cast aluminum core 3.

[0028] like Figure 2-Figure 8As shown, a first sealing groove 31 is provided at the outer end of the inner wall of the working pipe 32, the supporting mechanism 2 includes a first supporting seat 21 and a second supporting seat 22, the second supporting seat 22 is provided on the first supporting seat 21, a cavity is provided at the middle position of the upper end of the second supporting seat 22, a slide plate 23 is provided inside the second supporting seat 22, the cavity is aligned with the slide plate 23, a transparent glass is provided at the middle position of the slide plate 23, a first sealing block 24 is provided at the upper outer end of the cavity, the first sealing block 24 cooperates with the first sealing groove 31, and a cast aluminum core 3 is provided at one end close to the pressing plate 52 The second sealing groove 34, the end of the pressing plate 52 close to the cast aluminum core 3 is provided with a second sealing block 521, the second sealing block 521 cooperates with the second sealing groove 34, the interior of the cast aluminum core 3 is also provided with a conduit 33 and a through hole, the conduit 33 is connected with the working pipeline 32, and the pressing plate 52 is also provided with a vent pipe 522, the vent pipe 522 cooperates with the conduit 33, and the vent pipe 522 is connected with an external gas supply device through a hose, and the external gas supply device can be a gas supply device with a pressure detection function or a pressure sensor (gas supply The functions realized by the device and the pressure sensor belong to conventional technical means in this field, and the specific structure is not described). When the present invention performs defect detection on the cast aluminum core 3, the staff needs to clamp the first sealing groove 31 on the cast aluminum core 3 on the first sealing block 24, and the working pipeline 32 is placed in a closed space through the first sealing groove 31 and the first sealing block 24, and then the movable seat 5 and the pressure plate 52 are driven to descend by the power source inside the driving box 4 and the lifting assembly until the second sealing block 521 enters the second sealing groove 34, and the ventilation pipe 522 enters the conduit 33. At this time, the staff can deliver a certain amount of gas to the inside of the working pipe 32 through an external gas supply device, and by detecting the changes in the air pressure inside the working pipe 32 or detecting the changes in the air pressure in the area near the pressure plate 52 inside the cast aluminum core 3, it can be determined whether the working pipe 32 has defects such as holes. Finally, in the process of using the airtightness detection technology to detect the working pipe 32 of the present invention, the moving component can synchronously drive the visual detection component 214 to move on the horizontal plane, and the visual detection component 214 is used for the purpose of auxiliary detection, thereby further improving the accuracy of the detection of the cast aluminum core 3.

[0029] like Figure 5-Figure 8As shown, a working cavity 221 is provided inside the second support seat 22, and a slide plate 23 is provided in the working cavity 221. Two groups of third linear motors 222 are relatively provided on the inner wall of the working cavity 221, and the working ends of the two groups of third linear motors 222 are connected to the slide plate 23. When the present invention utilizes the air tightness detection technology to detect the working pipe 32, the slide plate 23 is always in a position aligned with the cavity. If the transparent glass on the slide plate 23 is contaminated, the staff can start the third linear motor 222 after the air tightness detection of the working pipe 32 is completed, and the slide plate 23 is driven by the third linear motor 222 to move in the working cavity 221, so as to avoid contamination of the transparent glass on the slide plate 23 so as to affect the detection accuracy of the visual detection component 214.

[0030] like Figure 6-Figure 7 As shown, the moving component includes a first linear motor 211, a mounting frame 212 and a second linear motor 213. The first linear motor 211 is provided with two groups. The two groups of first linear motors 211 are relatively arranged at the front and rear ends inside the first support seat 21, the mounting frame 212 is arranged between the two groups of first linear motors 211, the second linear motor 213 is arranged on the mounting frame 212, and the visual detection component 214 is arranged on the working end of the second linear motor 213. When the present invention detects the inner wall of the working pipe 32 through the visual detection component 214, the staff can drive the visual detection component 214 to move left and right through the first linear motor 211, and drive the visual detection component 214 to move forward and backward through the second linear motor 213, so as to perform all-round detection of various areas of the inner wall of the working pipe 32.

[0031] like Figure 7 and Fig. 9As shown, the visual inspection component 214 includes a fixed table 2141, a turntable 2142, a fixed shaft 2143, a first camera 2144 and a second camera 2145. A rotating motor is arranged inside the fixed table 2141. The turntable 2142 is arranged on the fixed table 2141. The working end of the rotating motor is connected to the turntable 2142. The fixed shaft 2143 is arranged on the turntable 2142. The first camera 2144 is arranged at the upper end of the fixed shaft 2143. The second camera 2145 is arranged at the side end of the fixed shaft 2143. The first camera 2144 and the second camera 2145 are both cameras with their own light sources. The diameter of the fixed shaft 2143 is smaller than the diameter of the working pipe 32. Since the working pipe 32 inside the cast aluminum core 3 is mostly a curved surface structure and the working pipe 32 has a large depth, the present invention A plurality of groups of cylinders 2121 are arranged inside the mounting frame 212, and the working ends of the plurality of groups of cylinders 2121 are connected to the second linear motor 213. When the air tightness test of the working pipe 32 is completed, the staff can drive the slide 23 to move out of the working chamber 221 through the third linear motor 222, and then drive the visual inspection component 214 to rise to the inside of the working pipe 32 through the plurality of groups of cylinders 2121, and the visual inspection component 214 is moved inside the working pipe 32 through the first linear motor 211 and the second linear motor 213. During the movement of the visual inspection component 214, the turntable 2142 is driven to rotate by the rotating motor, and the curved inner wall of the working pipe 32 is inspected by the first camera 2144, and the planar inner wall of the working pipe 32 is inspected by the second camera 2145.

[0032] like Figure 5 and Figure 8As shown, the inner wall and the outer wall of the first sealing block 24 are both provided with a plurality of exhaust holes 242, a groove is provided at the middle position of the first sealing block 24, and the plurality of exhaust holes 242 are connected to the groove, a sensing block 241 is provided in the groove, and a first electromagnet 243 is provided below the sensing block 241, and one end of the sensing block 241 close to the first electromagnet 243 is magnetic. When the present invention performs airtightness detection on the working pipeline 32, the first electromagnet 243 will generate a group of magnetic fields that repel the sensing block 241. At this time, the sensing block 241 is stably located at the upper end of the groove, and the plurality of exhaust holes 242 are in a closed state. Since the upper end area of ​​the first sealing block 24 is most susceptible to collision and wear during the working process of the present invention, the present invention provides a pressure detection element at the upper end of the sensing block 241. When a certain area of ​​the upper end of the first sealing block 24 is damaged due to collision or wear, the gas inside the working pipeline 32 is discharged from the first electromagnet 243. When the area between the sealing groove 31 and the first sealing block 24 leaks, the gas in the working pipe 32 will first flow through the groove (i.e., the area above the first sealing block 24). The pressure detection element can facilitate the staff to promptly determine whether the first sealing block 24 can be used normally, so as to facilitate subsequent timely maintenance. Finally, after the present invention has detected the airtightness of the working pipe 32, the staff can change the magnetic field of the first electromagnet 243 so that the first electromagnet 243 attracts the sensing block 241. At this time, the sensing block 241 will move in the direction of the first electromagnet 243. Finally, under the action of several groups of exhaust holes 242, the working pipe 32 will be connected to other non-main working areas of the cast aluminum core 3. At this time, if the staff continues to transport a certain amount of gas into the working pipe 32 through the external gas supply device, it can be determined whether there are defects such as holes and cracks in the non-main working areas of the cast aluminum core 3 by detecting the air pressure changes inside the cast aluminum core 3.

[0033] like Fig.10As shown, the lifting assembly includes a lifting frame 41, a telescopic rod 42, a piston 421 and a threaded rod 43. One end of the telescopic rod 42 is connected to the movable seat 5, and the other end of the telescopic rod 42 is arranged in the lifting frame 41 and is wound with a return spring. The piston 421 is arranged at one end of the telescopic rod 42 located in the lifting frame 41. An air pump is arranged in the driving box 4, and the air pump is connected to the top of the lifting frame 41. A plurality of groups of threaded holes are arranged at the lower end of the lifting frame 41, and a group of threaded rods 43 are arranged in each group of threaded holes. Before working, the staff of the present invention can first measure the second sealing block 521 and the second sealing groove 3 4, and then rotate several groups of threaded rods 43 until the distance between the several groups of threaded rods 43 and the piston 421 is equal to the distance between the second sealing block 521 and the second sealing groove 34. When the present invention needs to detect the surface defects of the cast aluminum core 3, compressed gas is delivered to the lifting frame 41 through the air pump so that the telescopic rod 42 drives the movable seat 5 and the pressure plate 52 to descend. Compared with the current direct use of components such as cylinders, the present invention can achieve the purpose of limiting through several groups of threaded rods 43, so as to avoid excessive force exerted by the pressure plate 52 on the cast aluminum core 3, so as to damage the cast aluminum core 3.

[0034] like Fig.11 As shown, under normal circumstances, when the present invention encounters an accident such as power failure, the return spring wound on the telescopic rod 42 can drive the movable seat 5 and the pressure plate 52 to reset. However, when working for a long time, the return spring may be unable to return to its original state due to fatigue. Because the present invention is provided with a plurality of groups of positioning grooves 53 in the movable seat 5, each group of positioning grooves 53 is provided with a group of connecting rods 51, each group of positioning grooves 53 is filled with hydraulic oil, and a pressure relief groove 54 is also provided in the movable seat 5. Each group of positioning grooves 53 is connected to the upper end of the pressure relief groove 54 through a drainage channel, and a second electromagnet 541 is provided at the upper end of the pressure relief groove 54, and a sealing plate 542 is provided below the second electromagnet 541. The end of the sealing plate 542 close to the second electromagnet 541 is magnetic. When the present invention is working normally, the second electromagnet 541 always attracts the sealing plate 542. At this time, through the sealing The plate 542 can block the drainage channel. Since the liquid is incompressible, the pressure plate 52 and the movable seat 5 are in a fixed state. When an accident such as a power outage occurs, the second electromagnet 541 no longer attracts the sealing plate 542. At this time, several groups of positioning grooves 53 are connected to the pressure relief grooves 54. The staff only needs to lift the pressure plate 52 to take out the cast aluminum core 3. Through the above technical solution, on the one hand, the effort required by the staff to take out the cast aluminum core 3 is reduced. On the other hand, when the staff makes an operational error or other problems, the amount of compressed gas delivered by the air pump to the lifting frame 41 is too large, so that the force applied by the pressure plate 52 on the cast aluminum core 3 exceeds the force of the second electromagnet 541 to attract the sealing plate 542, the sealing plate 542 will automatically detach from the second electromagnet 541, thereby achieving the purpose of active decompression and reducing the probability of damage to the cast aluminum core 3.

[0035] The working principle of the present invention is as follows: before working, according to the distance between the second sealing block 521 and the second sealing groove 34, the distance between the plurality of threaded rods 43 and the piston 421 is adjusted, and then the first sealing groove 31 on the cast aluminum core 3 is clamped on the first sealing block 24, and the working pipeline 32 is placed in a closed space through the first sealing groove 31 and the first sealing block 24, and then the compressed gas is delivered to the lifting frame 41 through the air pump so that the telescopic rod 42 drives the movable seat 5 and the pressing plate 52 to descend until the second sealing block 521 enters the second sealing groove 34, and then the staff can deliver a certain amount of gas to the inside of the working pipeline 32 through the external gas delivery device, and detect the change of the internal air pressure of the working pipeline 32 or the detection of the inside of the cast aluminum core 3 close to The change in regional air pressure of the pressure plate 52 can be used to determine whether the working pipe 32 has defects such as holes. After the air tightness test of the working pipe 32 is completed, the staff can drive the slide 23 to move out of the working chamber 221 through the third linear motor 222, and then drive the visual inspection component 214 to rise to the inside of the working pipe 32 through several groups of cylinders 2121. The visual inspection component 214 is moved inside the working pipe 32 through the first linear motor 211 and the second linear motor 213. During the movement of the visual inspection component 214, the turntable 2142 is driven to rotate by the rotating motor, and the curved inner wall of the working pipe 32 is inspected by the first camera 2144, and the planar inner wall of the working pipe 32 is inspected by the second camera 2145.

[0036] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. The embodiments should therefore be considered exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A machine vision-assisted surface defect detection device for cast aluminum core, characterized in that: The detection device comprises a body (1), a support mechanism (2), a drive box (4) and a movable seat (5); a mounting seat (11) is arranged on the body (1); the support mechanism (2) is arranged above the mounting seat (11); a drive box (4) is arranged at the top of the body (1); a movable seat (5) is arranged below the drive box (4); the drive box (4) and the movable seat (5) are connected via a lifting assembly; a pressing plate (52) is arranged on a side of the movable seat (5) close to the support mechanism (2); the movable seat (5) and the pressing plate (52) are connected via a connecting rod (51); the cast aluminum core (3) is supported by the support mechanism (2); a working pipe (32) is arranged inside the cast aluminum core (3); a moving assembly and a visual detection assembly (214) are arranged at the lower end of the support mechanism (2); defects of the working pipe (32) inside the cast aluminum core (3) are detected by the moving assembly and the visual detection assembly (214); The outer end of the inner wall of the working pipe (32) is provided with a first sealing groove (31), the supporting mechanism (2) comprises a first supporting seat (21) and a second supporting seat (22), a cavity is provided at the middle position of the upper end of the second supporting seat (22), a slide plate (23) is provided inside the second supporting seat (22), the cavity is aligned with the slide plate (23), a transparent glass is provided at the middle position of the slide plate (23), a first sealing block (24) is provided at the upper outer end of the cavity, the first sealing block (24) cooperates with the first sealing groove (31), the cast aluminum core (3 ) a second sealing groove (34) is provided at one end of the pressing plate (52) close to the cast aluminum core (3); a second sealing block (521) is provided at one end of the pressing plate (52) close to the cast aluminum core (3); the second sealing block (521) cooperates with the second sealing groove (34); a conduit (33) and a through hole are further provided inside the cast aluminum core (3); the conduit (33) is connected to the working pipeline (32); a vent pipe (522) is further provided on the pressing plate (52); the vent pipe (522) cooperates with the conduit (33); the vent pipe (522) is connected to an external gas supply device through a hose; A working chamber (221) is provided inside the second support seat (22), the slide plate (23) is arranged in the working chamber (221), two groups of third linear motors (222) are arranged opposite to each other on the inner wall of the working chamber (221), and the working ends of the two groups of third linear motors (222) are connected to the slide plate (23); The moving assembly comprises a first linear motor (211), a mounting frame (212) and a second linear motor (213); the first linear motor (211) is provided with two groups, the two groups of first linear motors (211) are relatively arranged at the front and rear ends inside the first support seat (21); the mounting frame (212) is arranged between the two groups of first linear motors (211); the second linear motor (213) is arranged on the mounting frame (212); the visual detection assembly (214) is arranged on the working end of the second linear motor (213); a cylinder (2121) is arranged inside the mounting frame (212); and the working end of the cylinder (2121) is connected to the second linear motor (213); The visual inspection component (214) comprises a fixed platform (2141), a turntable (2142), a fixed shaft (2143), a first camera (2144) and a second camera (2145); a rotating motor is arranged inside the fixed platform (2141); the turntable (2142) is arranged on the fixed platform (2141); a working end of the rotating motor is connected to the turntable (2142); the fixed shaft (2143) is arranged on the turntable (2142); the first camera (2144) is arranged at the upper end of the fixed shaft (2143); the second camera (2145) is arranged at the side end of the fixed shaft (2143); and the diameter of the fixed shaft (2143) is smaller than the diameter of the working pipe (32).

2. The device for detecting surface defects of cast aluminum core using machine vision assistance according to claim 1, characterized in that: The inner wall and the outer wall of the first sealing block (24) are both provided with a plurality of groups of exhaust holes (242); a groove is provided at the middle position of the first sealing block (24); the plurality of groups of exhaust holes (242) are connected to the groove; a sensing block (241) is provided in the groove; a pressure detection element is provided at the upper end of the sensing block (241); a first electromagnet (243) is provided at the lower end of the sensing block (241); and one end of the sensing block (241) close to the first electromagnet (243) is magnetic.

3. The device for detecting surface defects of cast aluminum core using machine vision assistance according to claim 1, characterized in that: The lifting assembly comprises a lifting frame (41), a telescopic rod (42), a piston (421) and a threaded rod (43); one end of the telescopic rod (42) is connected to a movable seat (5); the other end of the telescopic rod (42) is arranged in the lifting frame (41) and is wound with a return spring; the piston (421) is arranged at one end of the telescopic rod (42) located in the lifting frame (41); an air pump is arranged in the driving box (4), and the air pump is connected to the top end of the lifting frame (41); a plurality of groups of threaded holes are arranged at the lower end of the lifting frame (41); a group of threaded rods (43) is arranged in each group of threaded holes.

4. The device for detecting surface defects of cast aluminum core using machine vision assistance according to claim 3, characterized in that: The movable seat (5) is provided with a plurality of groups of positioning grooves (53), each group of positioning grooves (53) is provided with a group of connecting rods (51), the movable seat (5) is further provided with a pressure relief groove (54), each group of positioning grooves (53) is connected to the upper end of the pressure relief groove (54) through a liquid discharge channel, the upper end of the pressure relief groove (54) is provided with a second electromagnet (541), a sealing plate (542) is provided below the second electromagnet (541), and one end of the sealing plate (542) close to the second electromagnet (541) is magnetic.

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