Defect detection device and detection method for metal parts

Abstract

The invention discloses a defect detection device and method for metal parts, and belongs to the technical field of metal part detection.The defect detection device comprises a bottom frame, a mounting frame is arranged at one end of the top face of the bottom frame, a camera used for collecting images of the metal parts is arranged on the inner top face of the mounting frame, and a controller is arranged on the top face of the mounting frame; the output end of the camera is electrically connected with the input end of the controller, side plates are arranged on the two sides of the top face of the bottom frame, a rotating roller is rotationally installed between the two side plates, a plurality of bristles are fixed to the peripheral face of the rotating roller, a driving piece used for driving the rotating roller to rotate is arranged on the bottom frame, and a cleaning mechanism used for cleaning the bristles is arranged on the bottom frame. The method has the effect of improving the defect detection precision of the metal part.

Description

Technical Field

[0001] The present invention relates to the field of metal parts detection, and in particular to a defect detection device and a detection method for metal parts. Background Art

[0002] Metal parts are widely used in various industries, such as automobiles, machinery manufacturing, and aerospace. In the actual production process, due to various reasons such as processing technology, various defects such as scratches, pits, dents, glue marks, foreign matter, etc. will appear on the surface of parts. These defects will seriously affect the normal operation of parts. Therefore, timely detection of defects on the metal surface and evaluation of the severity of defects are of great significance to improving the quality of metal surfaces.

[0003] Currently, the commonly used metal surface defect detection is mainly solved through machine vision, which uses traditional image processing algorithms or machine learning algorithms to detect and identify images. However, during the production process of metal parts, there will be dust or foreign matter on the surface of metal parts. When collecting images, the camera will mistake dust and foreign matter for defects, resulting in low accuracy in metal part defect detection. Summary of the invention

[0004] In order to improve the problem that dust or foreign matter may exist on the surface of metal parts, and the machine may misjudge dust and foreign matter as defects during image acquisition, thereby resulting in low accuracy in metal part defect detection, the present application provides a defect detection device and method for metal parts.

[0005] In the first aspect, the present application provides a metal parts defect detection device that adopts the following technical solution: A defect detection device for metal parts comprises a base frame, a mounting frame is provided at one end of the top surface of the base frame, a camera for collecting images of metal parts is provided on the inner top surface of the mounting frame, a controller is provided on the top surface of the mounting frame, the output end of the camera is electrically connected to the input end of the controller, side panels are provided on both sides of the top surface of the base frame, a rotating roller is rotatably installed between the two side panels, a plurality of bristles are fixed to the outer peripheral surface of the rotating roller, a driving member for driving the rotating roller to rotate is provided on the base frame, and a cleaning mechanism for cleaning the bristles is provided on the base frame.

[0006] By adopting the above technical solution, the metal part is placed on the base frame and moved upward so that the bristles are in contact with the surface of the metal part. The driving roller is then driven to rotate, so that the rotating roller drives the bristles to rotate, and the bristles brush off the dust and foreign matter on the surface of the metal part. The bristles are then cleaned by the cleaning mechanism to improve the cleaning effect of the bristles on the dust and foreign matter on the surface of the metal part, thereby reducing the possibility of the camera mistakenly taking dust and foreign matter as defects when capturing images of the metal part, thereby improving the accuracy of metal part defect detection.

[0007] Preferably, a gantry is provided on the bottom surface of the base frame, and the gantry is located on the side of the side panel away from the mounting frame, the cleaning mechanism includes a dust suction tube rotatably installed between the gantries, connecting plates are fixed on both sides of the dust suction tube, the rotating roller passes through the connecting plates, and the connecting plates are rotatably connected to the rotating roller, an air cylinder is fixed on the end of the dust suction tube away from the rotating roller, a fan is provided in the air cylinder, and a dust collecting bag is provided on the end of the air cylinder away from the dust suction tube.

[0008] By adopting the above technical solution, when the rotating roller drives the bristles to rotate and clean the surface of the metal parts, the fan is started so that during the rotation of the fan, negative pressure is formed inside the dust collection tube, thereby sucking dust and foreign matter on the bristles into the dust collection tube, thereby keeping the bristles in a clean state.

[0009] Preferably, the driving member includes a pulley 1 arranged on the rotating roller, a motor is arranged on the side of the dust suction tube, a pulley 2 is arranged on the output shaft of the motor, and a transmission belt 1 is wound around the pulley 1 and the pulley 2.

[0010] By adopting the above technical solution, the motor is started, the output shaft of the motor drives the second pulley to rotate, the second pulley drives the first transmission belt to rotate, the first transmission belt drives the first pulley to rotate, the first pulley drives the rotating roller to rotate, so that the rotating roller drives the bristles to rotate, so that the bristles clean the surface of the metal parts.

[0011] Preferably, a scraper is fixed to the top of the side of the dust suction pipe close to the rotating roller, and a plurality of scraper rods are fixed to the side of the scraper away from the dust suction pipe, and the plurality of scraper rods are arranged at equal intervals along the length direction of the scraper.

[0012] By adopting the above technical solution, when the rotating roller drives the bristles to rotate, the bristles pass through the scraping rod, so that the scraping rod scrapes off the dust and foreign matter on the bristles, thereby facilitating the dust suction pipe to suck in the dust and foreign matter.

[0013] Preferably, arc grooves are provided on the sides of the two side plates, and rotating shafts are rotatably installed at both ends of the rotating roller. The rotating shafts pass through the arc grooves, and two nuts are sleeved on the rotating shafts. The two nuts are respectively located on both sides of the side plates, and the opposite sides of the two nuts are respectively in contact with the two side surfaces of the side plates.

[0014] By adopting the above technical solution, when dealing with metal parts of different thicknesses, the vacuum tube is rotated, the vacuum tube drives the connecting plate to move, the connecting plate drives the rotating roller to move, the rotating roller drives the rotating shaft to move, and the rotating shaft moves in the arc groove. When the cleaning position of the bristles on the metal parts is adjusted, the two nuts are rotated so that the opposite sides of the two nuts abut against the two side sides of the side plates, thereby fixing the rotating roller between the two side plates, making it easier for the bristles to clean metal parts of different thicknesses.

[0015] Preferably, a movable frame is slidably provided on the top surface of the base frame, a rotating shaft is rotatably installed between the relative inner side surfaces of the movable frame, a sticky roller is sleeved and fixed on the outer circumference of the rotating shaft, a sticky sticker is fixed on the outer circumference of the sticky roller, a synchronizing part for driving the rotating shaft to rotate is provided on the rotating roller, and a fixing part for fixing the movable frame is provided on the base frame.

[0016] By adopting the above technical solution, after the bristles clean the surface of the metal parts, the metal parts move forward, and when the rotating roller drives the bristles to rotate, the rotating roller also drives the synchronous part to rotate, so that the synchronous part drives the rotating shaft to rotate, and the rotating shaft drives the sticky roller to rotate, so that the sticky sticker on the sticky roller sticks away the dust on the surface of the metal parts, thereby further improving the cleaning efficiency of the surface of the metal parts.

[0017] Preferably, the synchronous component includes a pulley three arranged on the rotating shaft, a pulley four is arranged on the rotating roller, and a transmission belt two is arranged on the pulley three and the pulley four.

[0018] By adopting the above technical solution, when the rotating roller rotates, the rotating roller drives the pulley four to rotate, the pulley four drives the transmission belt two to rotate, the transmission belt two drives the pulley three to rotate, and the pulley three drives the rotating shaft to rotate.

[0019] Preferably, wedge blocks are fixed at both ends of the bottom surface of the movable frame, wedge grooves are provided on both sides of the top surface of the base frame, the wedge blocks are slidably arranged in the wedge grooves, through holes are provided on both sides of the top surface of the wedge blocks, and the fixing member includes a bolt 1 passing through the through hole, the bolt 1 is threadedly connected to the inner wall of the through hole, and the bottom end of the bolt 1 abuts against the inner bottom surface of the wedge groove.

[0020] By adopting the above technical solution, when the position of the bristles is adjusted for metal parts of different thicknesses, the transmission belt 2 may become loose. By moving the movable frame, the movable frame drives the wedge block to move, so that the transmission belt 2 is in a tensioned state, and then the bolt 1 is rotated so that the bottom end of the bolt 1 abuts against the inner bottom surface of the wedge groove, thereby fixing the wedge block in the wedge groove, and then fixing the movable frame on the base frame.

[0021] Preferably, a mounting plate is fixed to the side of the mounting frame away from the gantry, a cylinder is fixed to the top surface of the mounting plate, the bottom end of the cylinder piston rod passes through the mounting plate, a mounting tube is fixed to the bottom surface of the cylinder piston rod, a moving rod is vertically slidably arranged in the mounting tube, a marking pen is fixed to the bottom surface of the moving rod, a spring is fixed to the top end of the moving rod, the top end of the spring is fixed to the inner top surface of the mounting tube, and the output end of the controller is electrically connected to the control end of the cylinder.

[0022] By adopting the above technical solution, the camera captures images of the surface of the metal part and transmits the captured images to the controller, which analyzes the captured images. When the controller analyzes that there are defects in the received images, the controller controls the cylinder to start, so that the piston rod of the cylinder drives the installation cylinder to move downward, the installation cylinder drives the moving rod to move downward, and the moving rod drives the marking pen to move downward, so that the marking pen marks the surface of the metal part, thereby facilitating the staff to find the defect location on the surface of the metal part.

[0023] In a second aspect, the present application provides a defect detection method for metal parts, which adopts the following technical solution: A defect detection method for metal parts comprises the following steps: S1: Place the parts on the chassis and move the metal parts forward; S2: Start the motor, so that the rotating roller drives the bristles to rotate to clean the surface of the metal parts, and at the same time, the sticky roller drives the sticky sticker to rotate to remove the dust on the surface of the metal parts; S3: Then the metal part is imaged by the camera and transmitted to the controller; S4: Finally, the controller analyzes the received image. When the controller analyzes that there is a defect in the image, the controller controls the cylinder to start, so that the piston rod of the cylinder drives the marker pen to move downward, so that the marker pen marks the defect position.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. Place the metal part on the base frame and move it upwards so that the bristles touch the surface of the metal part. Then, drive the rotating roller to rotate, so that the rotating roller drives the bristles to rotate, so that the bristles can brush away the dust and foreign matter on the surface of the metal part. Then, the bristles are cleaned by the cleaning mechanism to improve the cleaning effect of the bristles on the dust and foreign matter on the surface of the metal part, thereby reducing the possibility of the camera mistaking dust and foreign matter for defects when collecting images of the metal part, thereby improving the accuracy of metal part defect detection. 2. When cleaning metal parts of different thicknesses, the vacuum tube is rotated, the vacuum tube drives the connecting plate to move, the connecting plate drives the rotating roller to move, the rotating roller drives the rotating shaft to move, and the rotating shaft moves in the arc groove. When the cleaning position of the bristles on the metal parts is adjusted, the two nuts are rotated so that the opposite sides of the two nuts abut against the two side surfaces of the side plates, thereby fixing the rotating roller between the two side plates, and making it easier for the bristles to clean metal parts of different thicknesses; 3. The camera captures images of the surface of the metal part and transmits the captured images to the controller, which analyzes the captured images. When the controller analyzes that there are defects in the received images, the controller controls the cylinder to start, so that the piston rod of the cylinder drives the installation cylinder to move downward, the installation cylinder drives the moving rod to move downward, and the moving rod drives the marking pen to move downward, so that the marking pen marks the surface of the metal part, which makes it easier for the staff to find the defect location on the surface of the metal part. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the defect detection device for metal parts according to an embodiment of the present application.

[0026] Figure 2 It is a cross-sectional view of the installation cylinder in the embodiment of the present application.

[0027] Figure 3 It is a schematic diagram of the structure of the rotating roller in the embodiment of the present application.

[0028] Figure 4 It is a schematic diagram of the structure of the dust collection tube in the embodiment of the present application.

[0029] Figure 5 It is a schematic diagram of the structure of the mobile rack in the embodiment of the present application.

[0030] Figure numerals: 1, chassis; 11, mounting frame; 12, camera; 13, mounting plate; 14, cylinder; 15, mounting tube; 16, moving rod; 17, spring; 18, marking pen; 19, controller; 2, side plate; 21, rotating roller; 22, bristles; 23, rotating shaft; 24, arc groove; 25, nut; 3, gantry; 31, dust suction pipe; 311, scraper; 312, scraper rod; 32, connecting plate; 33, motor; 34, pulley ; 35. Pulley 2; 36. Drive belt 1; 37. Air duct; 38. Fan; 39. Dust bag; 4. Mobile frame; 41. Crossbeam; 42. Vertical plate; 43. Rotating shaft; 44. Sticky roller; 45. Sticky sticker; 46. Pulley 3; 47. Pulley 4; 48. Drive belt 2; 5. Sliding groove; 51. Telescopic plate; 52. Round hole 1; 53. Round hole 2; 54. Bolt 2; 55. Wedge block; 56. Wedge groove; 57. Through hole; 58. Bolt 1. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-5 This application is described in further detail.

[0032] The embodiment of the present application discloses a defect detection device for metal parts.

[0033] Reference Figure 1 and Figure 2 A defect detection device for metal parts includes a base frame 1, a mounting frame 11 is fixed to one end of the top surface of the base frame 1, a camera 12 is fixed to the inner top surface of the mounting frame 11, and the camera 12 is used to collect images of metal parts. A controller 19 is fixed to the top surface of the mounting frame 11, and the output end of the camera 12 is electrically connected to the input end of the controller 19. A mounting plate 13 is fixed to the outer side surface of the mounting frame 11, and a cylinder 14 is fixed to the top surface of the mounting plate 13, and the output end of the controller 19 is electrically connected to the input end of the cylinder 14. The bottom end of the piston rod of the cylinder 14 passes through the bottom surface of the mounting plate 13, and the piston rod of the cylinder 14 is vertically slidably connected to the mounting plate 13. A mounting cylinder 15 is fixed to the bottom end of the piston rod of the cylinder 14, and a moving rod 16 is vertically slidably arranged in the mounting cylinder 15, and a marking pen 18 is fixed to the bottom surface of the moving rod 16. A spring 17 is fixed to the top surface of the moving rod 16, and the top end of the spring 17 is fixed to the inner top surface of the mounting cylinder 15.

[0034] Reference Figure 1 and Figure 3, side plates 2 are fixed on both sides of the top surface of the bottom frame 1, a rotating roller 21 is rotatably mounted between the two side plates 2, and bristles 22 are fixed on the outer circumference of the rotating roller 21. Both ends of the rotating roller 21 are rotatably connected with a rotating shaft 23, and the sides of the two side plates 2 are provided with arc grooves 24, and the ends of the rotating shaft 23 away from the rotating roller 21 pass through the arc groove 24, and the outer circumferences of the two rotating shafts 23 are sleeved with two nuts 25, and the nuts 25 are threadedly connected with the rotating shaft 23. The two nuts 25 are respectively located on both sides of the side plates 2, and the sides of the two nuts 25 close to each other are respectively in contact with the two side surfaces of the side plates 2.

[0035] Reference Figure 1 and Figure 3 A gantry 3 is fixed on the top surface of the bottom frame 1, and the gantry 3 is located on the side of the side plate 2 away from the mounting frame 11. A dust suction pipe 31 is rotatably mounted between the opposite inner sides of the gantry 3. The dust suction pipe 31 is a square tube. Connecting plates 32 are fixed on both sides of the dust suction pipe 31. The rotating roller 21 passes through the two connecting plates 32, and the connecting plates 32 are rotatably connected to the rotating roller 21. A motor 33 is fixed on one side of the dust suction pipe 31. A pulley 2 35 is fixedly mounted on the output shaft of the motor 33. A pulley 1 34 is fixedly mounted on the rotating roller 21. A transmission belt 1 36 is wound around the pulley 1 34 and the pulley 2 35.

[0036] Reference Figure 1 , Figure 3 and Figure 4 The bottom surface of the dust suction pipe 31 is provided with an inclined surface inclined upward at one end close to the rotating roller 21, and a scraper 311 is fixed to the top of the side surface of the dust suction pipe 31 close to the rotating roller 21. A plurality of scraper rods 312 are fixed to the side surface of the scraper 311 close to the rotating roller 21, and the plurality of scraper rods 312 are arranged at equal intervals along the length direction of the scraper 311. A wind tube 37 is fixed to the end of the dust suction pipe 31 away from the rotating roller 21, and a fan 38 is fixed in the wind tube 37. A dust bag 39 is fixed to the end of the wind tube 37 away from the dust suction pipe 31.

[0037] Reference Figure 1 and Figure 5A mobile frame 4 is fixed on the top surface of the bottom frame 1, and the mobile frame 4 is located between the side plate 2 and the mounting frame 11. The mobile frame 4 includes a crossbeam 41 and vertical plates 42 integrally formed at both ends of the bottom surface of the crossbeam 41, and a rotating shaft 43 is rotatably installed between the two vertical plates 42, and a dust sticking roller 44 is sleeved and fixed on the outer circumference of the rotating shaft 43, and a dust sticking sticker 45 is fixed on the outer circumference of the dust sticking roller 44. A pulley 3 46 is sleeved and fixed on the outer circumference of the rotating shaft 43, and a pulley 47 is sleeved and fixed on the outer circumference of the rotating roller 21, and a transmission belt 2 48 is wound around the pulley 3 46 and the pulley 4 47. The bottom surface of the vertical plate 42 is provided with a sliding groove 5, and a telescopic plate 51 is vertically slidably arranged in the sliding groove 5. The side surface of the telescopic plate 51 is provided with a plurality of circular holes 52, and the side surface of the vertical plate 42 is provided with a plurality of circular holes 53. Bolts 54 are inserted into the circular holes 52 and 53, and the bolts 54 are threadedly connected with the inner circumference of the circular holes 53. Wedge blocks 55 are fixed to the bottom surfaces of the two telescopic plates 51, and wedge grooves 56 are provided on both sides of the top surface of the bottom frame 1, and the wedge blocks 55 are slidably arranged in the wedge grooves 56. Through holes 57 are provided on both sides of the top surface of the wedge blocks 55, and bolts 58 are inserted into the through holes 57. The bolts 58 are threadedly connected with the inner wall of the through holes 57, and the bottom ends of the bolts 58 abut against the inner bottom surface of the wedge grooves 56.

[0038] The implementation principle of the defect detection device for metal parts in the embodiment of the present application is as follows: the dust suction pipe 31 is rotated so that the dust suction pipe 31 drives the connecting plate 32 to move, the connecting plate 32 drives the rotating roller 21 to move, the rotating roller 21 drives the rotating shaft 23 to move, the position of the bristles 22 is adjusted so that the bristles 22 can clean the surface of the metal parts, and when the position of the bristles 22 is adjusted, the two nuts 25 on the rotating shaft 23 are rotated so that the sides of the two nuts 25 close to each other abut against the two sides of the side plate 2, thereby fixing the rotating roller 21 between the two side plates 2. Then, the moving frame 4 is moved so that the transmission belt 2 48 is in a tensioned state, and then the crossbeam 41 is moved vertically so that the crossbeam 41 drives the vertical plate 42 to move, the vertical plate 42 drives the rotating shaft 43 to move, the rotating shaft 43 drives the dust sticking roller 44 to move, and the dust sticking roller 44 drives the dust sticking sticker 45 to move, so that the dust sticking sticker 45 can fit with the surface of the metal parts, so that the dust sticking sticker 45 can stick to the dust on the surface of the metal parts. Then, the metal part is placed on the base frame 1, and the metal part is moved forward, and the motor 33 is started. The output shaft of the motor 33 drives the pulley 2 35 to rotate, and the pulley 2 35 drives the transmission belt 1 36 to rotate, and the transmission belt 1 36 drives the pulley 1 34 to rotate, so that the pulley 1 34 drives the rotating roller 21 to rotate, and the rotating roller 21 drives the bristles 22 to rotate, so that the bristles 22 brush off the dust on the metal part, and the rotating roller 21 also drives the pulley 4 47 to rotate while rotating, and the pulley 4 47 drives the transmission belt 2 48 to rotate, and the transmission belt 2 48 drives the pulley 3 46 to rotate, and the pulley 3 46 drives the rotating shaft 43 to rotate, and the rotating shaft 43 drives the sticky roller 44 to rotate, and the sticky roller 44 drives the sticky sticker 45 to rotate, so that the sticky sticker 45 sticks to the dust that has not been swept away on the surface of the metal part, thereby improving the cleanliness of the surface of the metal part, thereby reducing the possibility that the camera 12 mistakenly takes dust and foreign matter as defects when acquiring images of the metal part, thereby improving the defect detection accuracy of the metal part.

[0039] After the bristles 22 clean the dust on the surface of the metal parts, the bristles 22 of the rotating roller 21 rotate, so that the bristles 22 pass through the scraper rod 312, and the scraper 311 scrapes off the dust and foreign matter on the bristles 22, and then the fan 38 is started to form a negative pressure in the dust suction pipe 31, so that the dust and foreign matter scraped off by the scraper rod 312 are sucked into the dust suction pipe 31, and then the dust and foreign matter in the dust suction pipe 31 are transported to the dust collecting bag 39.

[0040] The present application also discloses a defect detection method for metal parts, comprising the following steps: S1: Place the parts on the chassis 1 and move the metal parts forward; S2: Start the motor 33, so that the rotating roller 21 drives the bristles 22 to rotate to clean the surface of the metal part, and at the same time the sticky roller 44 drives the sticky sticker 45 to rotate to remove the dust on the surface of the metal part; S3: Then the camera 12 collects the image of the metal part and transmits it to the controller 19; S4: Finally, the controller 19 analyzes the received image. When the controller 19 finds defects in the image, the controller 19 controls the cylinder 14 to start, so that the piston rod of the cylinder 14 drives the marker 18 to move downward, so that the marker 18 marks the defect position.

[0041] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A defect detection device for metal parts, characterized in that: The invention comprises a base frame (1), a mounting frame (11) being arranged at one end of the top surface of the base frame (1), a camera (12) being arranged on the inner top surface of the mounting frame (11) for collecting images of metal parts, a controller (19) being arranged on the top surface of the mounting frame (11), an output end of the camera (12) being electrically connected to an input end of the controller (19), side panels (2) being arranged on both sides of the top surface of the base frame (1), a rotating roller (21) being rotatably mounted between the two side panels (2), a plurality of bristles (22) being fixed to the outer peripheral surface of the rotating roller (21), a driving member being arranged on the base frame (1) for driving the rotating roller (21) to rotate, and a cleaning mechanism being arranged on the base frame (1) for cleaning the bristles (22).

2. A defect detection device for metal parts according to claim 1, characterized in that: A gantry (3) is provided on the bottom surface of the base frame (1), and the gantry (3) is located on a side of the side plate (2) away from the mounting frame (11). The cleaning mechanism comprises a dust suction pipe (31) rotatably mounted between the gantry (3), and connecting plates (32) are fixed on both sides of the dust suction pipe (31), and the rotating roller (21) passes through the connecting plates (32), and the connecting plates (32) are rotatably connected to the rotating roller (21). An air cylinder (37) is fixed on one end of the dust suction pipe (31) away from the rotating roller (21), and a fan (38) is arranged in the air cylinder (37), and a dust collecting bag (39) is sleeved on one end of the air cylinder (37) away from the dust suction pipe (31).

3. A defect detection device for metal parts according to claim 2, characterized in that: The driving member comprises a pulley 1 (34) arranged on the rotating roller (21), a motor (33) is arranged on the side of the dust suction pipe (31), a pulley 2 (35) is arranged on the output shaft of the motor (33), and a transmission belt 1 (36) is wound around the pulley 1 (34) and the pulley 2 (35).

4. A defect detection device for metal parts according to claim 2, characterized in that: A scraper (311) is fixed to the top end of the side surface of the dust suction pipe (31) close to the rotating roller (21), and a plurality of scraper rods (312) are fixed to the side surface of the scraper (311) away from the dust suction pipe (31), and the plurality of scraper rods (312) are arranged at equal intervals along the length direction of the scraper (311).

5. A defect detection device for metal parts according to claim 2, characterized in that: The sides of the two side plates (2) are each provided with an arc groove (24); both ends of the rotating roller (21) are rotatably mounted with a rotating shaft (23); the rotating shaft (23) passes through the arc groove (24); two nuts (25) are sleeved on the rotating shaft (23); the two nuts (25) are respectively located on two sides of the side plate (2); and the opposite sides of the two nuts (25) are respectively in contact with the two side surfaces of the side plate (2).

6. A defect detection device for metal parts according to claim 5, characterized in that: A movable frame (4) is slidably arranged on the top surface of the base frame (1); a rotating shaft (43) is rotatably mounted between the opposite inner side surfaces of the movable frame (4); a dust sticking roller (44) is sleeved and fixed on the outer circumference of the rotating shaft (43); a dust sticking sticker (45) is fixed on the outer circumference of the dust sticking roller (44); a synchronizing member for driving the rotating shaft (43) to rotate is arranged on the rotating roller (21); and a fixing member for fixing the movable frame (4) is arranged on the base frame (1).

7. A defect detection device for metal parts according to claim 6, characterized in that: The synchronous component comprises a pulley three (46) arranged on the rotating shaft (43), a pulley four (47) is arranged on the rotating roller (21), and a transmission belt two (48) is arranged on the pulley three (46) and the pulley four (47).

8. A defect detection device for metal parts according to claim 6, characterized in that: Wedge blocks (55) are fixed at both ends of the bottom surface of the movable frame (4), wedge grooves (56) are provided on both sides of the top surface of the base frame (1), the wedge blocks (55) are slidably arranged in the wedge grooves (56), through holes (57) are provided on both sides of the top surface of the wedge blocks (55), and the fixing member comprises a bolt (58) which is penetrated through the through hole (57), the bolt (58) is threadedly connected to the inner wall of the through hole (57), and the bottom end of the bolt (58) is in contact with the inner bottom surface of the wedge groove (56).

9. A defect detection device for metal parts according to claim 2, characterized in that: A mounting plate (13) is fixed to the side of the mounting frame (11) away from the gantry (3); a cylinder (14) is fixed to the top surface of the mounting plate (13); the bottom end of the piston rod of the cylinder (14) passes through the mounting plate (13); a mounting tube (15) is fixed to the bottom surface of the piston rod of the cylinder (14); a moving rod (16) is vertically slidably arranged in the mounting tube (15); a marking pen (18) is fixed to the bottom surface of the moving rod (16); a spring (17) is fixed to the top end of the moving rod (16); the top end of the spring (17) is fixed to the inner top surface of the mounting tube (15); and the output end of the controller (19) is electrically connected to the control end of the cylinder (14).

10. A method for detecting defects in metal parts, according to a device for detecting defects in metal parts according to any one of claims 1 to 9, characterized in that: The steps include: S1: Place the parts on the base frame (1) and move the metal parts forward; S2: starting the motor (33), so that the rotating roller (21) drives the bristles (22) to rotate to clean the surface of the metal part, and at the same time, the sticky roller (44) drives the sticky sticker (45) to rotate to remove the dust on the surface of the metal part; S3: Then, the camera (12) collects images of the metal parts and transmits them to the controller (19); S4: Finally, the controller (19) analyzes the received image. When the controller (19) finds that there is a defect in the image, the controller (19) controls the cylinder (14) to start, so that the piston rod of the cylinder (14) drives the marking pen (18) to move downward, so that the marking pen (18) marks the defect position.

Images