Metal plate surface defect detection device and detection method thereof

Abstract

The invention belongs to the technical field of metal plate detection devices, and discloses a metal plate surface defect detection device and a detection method thereof.The metal plate surface defect detection device comprises a detection table, a detection frame is fixedly installed at the top end of the detection table, a detector is arranged at the bottom of the detection frame, and a fixing assembly and a bearing assembly are arranged below the detector; the fixing assembly comprises supporting frames arranged below the detector, the supporting frames are installed at the top end of the detection table, the number of the supporting frames is two, fixing plates are arranged on one sides of the two supporting frames, and the fixing plates are connected with the supporting frames through the overturning assembly. Firstly, the two ends of the metal plate are placed between the two fixing plates, the two fixing plates clamp and fix the metal plate, and then the surface of the metal plate is detected through the detector; after detection, the double-shaft motor is started, the two fixing plates clamp the metal plate and turn over by 180 degrees, the other face of the metal plate is detected, and the detection efficiency of the metal plate is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal plate detection devices, and specifically relates to a metal plate surface defect detection device and a detection method thereof. Background Art

[0002] Sheet metal, i.e. flat objects made of metal materials, has a wide range of applications, covering many industries such as automobile repair, industrial production, and construction;

[0003] If there are scratches, oxidation, rust, unevenness or unevenness on the surface of metal sheets, it will directly affect their appearance and overall quality. With the help of surface defect detection technology, these defects can be quickly identified and repaired to ensure that the metal sheets meet the quality requirements, thereby improving the market competitiveness of the products.

[0004] After searching, such as patent: CN217305150U, a metal plate surface defect detection device includes a bottom groove, the left and right sides of the inner wall of the bottom groove are each provided with a first cavity, the rear sides of the two inner walls of the first cavities are each fixedly connected with a first motor, the output ends of the two first motors are each fixedly connected with a threaded rod, the rod walls of the two threaded rods are each threadedly connected with a moving block, the opposite sides of the two inner walls of the first cavities are each provided with a moving opening, and the surfaces of the opposite sides of the two moving blocks are commonly fixedly connected with a moving groove. The device can perform a one-time detection on a smaller steel plate, avoid manual secondary placement of the steel plate, reduce the waste of time for the second detection of a smaller area, reduce the time for plate detection, increase detection efficiency, reduce the workload of manual secondary installation and placement, reduce the work intensity of workers, and simplify the work process;

[0005] In the process of performing surface defect detection on metal sheets, in order to ensure the integrity of the detection, both sides of the sheet must be inspected. However, after completing the detection on one side, the existing detection equipment still requires the operator to manually disassemble, reinstall and flip the sheet. This process is not only cumbersome, but also reduces the efficiency of detection. Summary of the invention

[0006] The object of the present invention is to provide a metal plate surface defect detection device and a detection method thereof to solve the problems raised in the above background technology.

[0007] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: a metal plate surface defect detection device, comprising a detection platform, a detection frame is fixedly installed on the top of the detection platform, a detector is arranged at the bottom of the detection frame, and a fixing component and a bearing component are arranged below the detector;

[0008] The fixing assembly includes a support frame arranged below the detector, the support frame is installed on the top of the detection table, two support frames are symmetrically arranged, and a fixing plate is arranged on one side of the two support frames, and the fixing plate is connected to the support frame through a flip assembly;

[0009] One of the support frames is slidably mounted inside the testing platform, a threaded rod is connected to the inner thread of the support frame, a rotating block is fixedly mounted on one end of the threaded rod, and the other support frame is fixedly mounted on the top of the testing platform;

[0010] The flip assembly includes a first rotating shaft embedded in the two supporting frames, one end of the first rotating shaft is fixedly connected to the fixed plate, the outer walls of the two first rotating shafts are installed with pulley groups, the inner parts of the two pulley groups away from one end of the first rotating shaft are respectively installed with a fourth rotating shaft and a second rotating shaft, the outer wall of the second rotating shaft is evenly provided with limit rods in a circular array, the limit rods are embedded in the fourth rotating shaft, and the outer wall of the second rotating shaft is installed with a dual-axis motor.

[0011] As a further technical solution of the present invention, the fourth rotating shaft is slidably connected to the limiting rod.

[0012] As a further technical solution of the present invention, a connecting shaft is installed inside the fixing plate, a buffer plate is fixedly installed at one end of the connecting shaft away from the fixing plate, and the buffer plate is arranged on one side of the fixing plate.

[0013] As a further technical solution of the present invention, the connecting shaft is slidably installed inside the fixed plate, and a spring is installed between the connecting shaft and the fixed plate.

[0014] As a further technical solution of the present invention, the connecting shafts are evenly arranged in a ring array.

[0015] As a further technical solution of the present invention, the bearing assembly includes a bearing plate arranged below the detector, and a guide shaft and a reciprocating screw are respectively embedded in the bottom end of the bearing plate, and the guide shaft and the reciprocating screw are both installed on the top of the detection platform.

[0016] As a further technical solution of the present invention, the bottom end of the reciprocating screw is fixedly connected to a first gear, one side of the first gear is meshedly connected to a rack plate, the other side of the rack plate is meshedly connected to a second gear, a third rotating shaft is fixedly installed inside the second gear, a first bevel gear is fixedly installed at the bottom end of the third rotating shaft, one side of the first bevel gear is meshedly connected to a second bevel gear, and the second bevel gear is fixedly installed on the outer wall of the second rotating shaft.

[0017] As a further technical solution of the present invention, the second gear and the first gear are symmetrically arranged on both sides of the rack plate.

[0018] As a further technical solution of the present invention, both ends of the rack plate are provided with protrusions, the protrusions are fixedly installed inside the detection platform, and the outer wall of the bottom end of the reciprocating screw is installed with a coil spring.

[0019] A detection method of a metal plate surface defect detection device comprises the following steps:

[0020] S1: When inspecting the surface of a metal plate for defects, first place the metal plate on the top of the carrier plate, and make the two ends of the metal plate between the two buffer plates, then rotate the rotating block, the rotation of the rotating block drives the rotation of the threaded rod, the rotation of the threaded rod drives the movement of one of the support frames, the movement of the support frame drives the movement of the fixed plate, so that the two fixed plates and the buffer plate clamp and fix the metal plate;

[0021] S2: Then the surface of the metal plate is inspected by a detector;

[0022] S3: After the detection, the double-axis motor is started, and the start of the double-axis motor drives the rotation of the second rotating shaft, and the rotation of the second rotating shaft drives the rotation of the fourth rotating shaft, and drives the first rotating shaft to rotate through the pulley group, and the rotation of the first rotating shaft drives the rotation of the fixed plate, so that the two fixed plates holding the metal plate are turned 180 degrees;

[0023] S4: At the same time, the rotation of the second rotating shaft drives the rotation of the second bevel gear, the rotation of the second bevel gear drives the rotation of the first bevel gear, the rotation of the first bevel gear drives the rotation of the third rotating shaft, the rotation of the third rotating shaft drives the rotation of the second gear, the rotation of the second gear drives the movement of the rack plate, the movement of the rack plate drives the rotation of the first gear, the rotation of the first gear drives the rotation of the reciprocating screw rod, the rotation of the reciprocating screw rod drives the bearing plate to move downward, so that space is left above the bearing plate for the metal plate to flip;

[0024] S5: At the same time, when the rack plate moves toward the end close to the protrusion, the rack plate contacts the protrusion and moves downward under force, so that the tooth block on one side of the rack plate is disengaged from the second gear, and then the reciprocating screw rod is reversed by releasing the elastic potential energy through the coil spring, so that the bearing plate moves up and resets;

[0025] S6: When the reciprocating screw is reversed, the rack plate moves in the same way, and the rack plate contacts the protrusion at the other end and is forced to move upward to re-engage with the second gear;

[0026] S7: Then the other side of the metal plate is tested. After the test, the metal plate is taken out to complete the test.

[0027] The beneficial effects of the present invention are as follows:

[0028] 1. The present invention is arranged by cooperating with a fixing component and a flipping component. When defect detection is performed on the surface of a metal plate, the two ends of the metal plate are first placed between two fixing plates, and then the rotating block is rotated. The rotation of the rotating block drives the rotation of the threaded rod, and the rotation of the threaded rod drives the movement of one of the support frames, and the movement of the support frame drives the movement of the fixing plate, so that the two fixing plates clamp and fix the metal plate, and then the surface of the metal plate is detected by the detector. After the detection, the double-axis motor is started, and the start of the double-axis motor drives the rotation of the second rotating shaft, and the rotation of the second rotating shaft drives the rotation of the fourth rotating shaft, and drives the first rotating shaft to rotate through the pulley group. The rotation of the first rotating shaft drives the rotation of the fixing plate, so that the two fixing plates clamp the metal plate and flip it 180 degrees, and the other side of the metal plate is detected, thereby improving the detection efficiency of the metal plate.

[0029] 2. The present invention provides a load-bearing assembly so that when installing a metal plate, the metal plate can be placed on the top of the load-bearing plate first, and the metal plate can be supported by the load-bearing plate. Then, the position of one of the support frames can be adjusted, and the metal plate can be fixed by two fixing plates, so as to facilitate the installation of the metal plate.

[0030] 3. The present invention arranges the bearing plate to move up and down. When the metal plate is flipped, the rotation of the second rotating shaft drives the rotation of the second bevel gear, the rotation of the second bevel gear drives the rotation of the first bevel gear, the rotation of the first bevel gear drives the rotation of the third rotating shaft, the rotation of the third rotating shaft drives the rotation of the second gear, the rotation of the second gear drives the movement of the rack plate, the movement of the rack plate drives the rotation of the first gear, the rotation of the first gear drives the rotation of the reciprocating screw, the rotation of the reciprocating screw drives the bearing plate to move downward, leaving space above the bearing plate for the metal plate to flip, thereby improving the stability and reliability of the metal plate when flipping. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention;

[0033] Figure 3 For the present invention Figure 2 A schematic diagram of the structure enlargement in the middle;

[0034] Figure 4 It is a schematic diagram of the structural cross section of the detection platform of the present invention;

[0035] Figure 5 For the present invention Figure 4 A magnified schematic diagram of the structure at B in the middle;

[0036] Figure 6For the present invention Figure 4 A magnified schematic diagram of the structure at C in the middle;

[0037] Figure 7 It is a structural schematic diagram of the rack plate of the present invention.

[0038] In the figure: 1. detection table; 2. detection frame; 3. detector; 4. support frame; 5. first rotating shaft; 6. fixed plate; 7. pulley group; 8. second rotating shaft; 9. limit rod; 10. dual-axis motor; 11. buffer plate; 12. connecting shaft; 13. spring; 14. bearing plate; 15. guide shaft; 16. reciprocating screw rod; 17. first gear; 18. rack plate; 19. second gear; 20. third rotating shaft; 21. first bevel gear; 22. second bevel gear; 23. coil spring; 24. fourth rotating shaft; 25. threaded rod; 26. rotating block; 27. bump. DETAILED DESCRIPTION

[0039] 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.

[0040] like Figures 1 to 7 As shown, in an embodiment of the present invention, a metal plate surface defect detection device comprises a detection platform 1, a detection frame 2 is fixedly installed on the top of the detection platform 1, a detector 3 is arranged at the bottom of the detection frame 2, and a fixing component and a bearing component are arranged below the detector 3;

[0041] The fixing assembly includes a support frame 4 arranged below the detector 3, the support frame 4 is installed on the top of the detection platform 1, and two support frames 4 are symmetrically arranged, and a fixing plate 6 is arranged on one side of each of the two support frames 4, and the fixing plate 6 is connected to the support frame 4 through a flip assembly;

[0042] One of the support frames 4 is slidably mounted inside the testing platform 1, the internal thread of the support frame 4 is connected with a threaded rod 25, one end of the threaded rod 25 is fixedly mounted with a rotating block 26, and the other support frame 4 is fixedly mounted on the top of the testing platform 1;

[0043] The flipping assembly includes a first rotating shaft 5 embedded in two supporting frames 4, one end of the first rotating shaft 5 is fixedly connected to a fixed plate 6, and a pulley set 7 is installed on the outer walls of the two first rotating shafts 5. A fourth rotating shaft 24 and a second rotating shaft 8 are installed inside the two pulley sets 7 away from one end of the first rotating shaft 5, respectively. Limit rods 9 are evenly arranged on the outer wall of the second rotating shaft 8 in a circular array, and the limit rods 9 are embedded in the fourth rotating shaft 24. A dual-axis motor 10 is installed on the outer wall of the second rotating shaft 8.

[0044] Existing: CN217305150U discloses a metal sheet surface defect detection device. This patent discloses the detector proposed in this application document. The detector in this application document adopts the same technical means in this prior art, and this technical means will not be described one by one here;

[0045] Through the coordinated arrangement of the fixing assembly and the flipping assembly, when the surface of the metal plate is inspected for defects, the two ends of the metal plate are first placed between the two fixing plates 6, and then the rotating block 26 is rotated. The rotation of the rotating block 26 drives the rotation of the threaded rod 25, and the rotation of the threaded rod 25 drives the movement of one of the support frames 4. The movement of the support frame 4 drives the movement of the fixing plate 6, so that the two fixing plates 6 clamp and fix the metal plate;

[0046] Then the surface of the metal plate is detected by the detector 3;

[0047] After the detection, the dual-axis motor 10 is started. The start of the dual-axis motor 10 drives the rotation of the second rotating shaft 8. The rotation of the second rotating shaft 8 drives the rotation of the fourth rotating shaft 24, and drives the first rotating shaft 5 to rotate through the pulley group 7. The rotation of the first rotating shaft 5 drives the rotation of the fixed plate 6, so that the two fixed plates 6 clamping the metal plate are flipped 180 degrees, and the other side of the metal plate is detected, thereby improving the detection efficiency of the metal plate.

[0048] like Figure 5 As shown, the fourth rotating shaft 24 is slidably connected to the limiting rod 9.

[0049] like Figure 4 and Figure 5 As shown, a connecting shaft 12 is installed inside the fixing plate 6 , and a buffer plate 11 is fixedly installed at one end of the connecting shaft 12 away from the fixing plate 6 , and the buffer plate 11 is arranged on one side of the fixing plate 6 .

[0050] During the fixing process of the metal plate, stress concentration often occurs due to excessive local force. The buffer plate 11 is used to disperse the stress to avoid damage or breakage of the metal plate caused by stress concentration, which helps to ensure the service life of the metal plate and safety during inspection.

[0051] like Figure 4 and Figure 5 As shown, the connecting shaft 12 is slidably installed inside the fixing plate 6 , and a spring 13 is installed between the connecting shaft 12 and the fixing plate 6 .

[0052] When installing the same batch of metal plates, the buffer plate 11 and the fixing plate 6 can be moved a certain distance by the elastic force of the spring 13, which can make the installation process of the metal plates more flexible and facilitate quick installation and disassembly, thereby improving the detection efficiency.

[0053] like Figure 4 and Figure 5 As shown, the connecting shafts 12 are evenly arranged in a circular array.

[0054] like Figures 1 to 4 As shown, the bearing assembly includes a bearing plate 14 arranged below the detector 3 , a guide shaft 15 and a reciprocating screw 16 are respectively embedded in the bottom end of the bearing plate 14 , and the guide shaft 15 and the reciprocating screw 16 are both installed on the top of the detection platform 1 .

[0055] Through the setting of the bearing assembly, when installing the metal plate, the metal plate can be placed on the top of the bearing plate 14 first, and the metal plate can be supported by the bearing plate 14, and then the position of one of the support frames 4 can be adjusted, and the metal plate can be fixed by two fixing plates 6 to facilitate the installation of the metal plate.

[0056] like Figure 3 , Figure 6 and Figure 7 As shown, the bottom end of the reciprocating screw 16 is fixedly connected with a first gear 17, one side of the first gear 17 is meshedly connected with a rack plate 18, the other side of the rack plate 18 is meshedly connected with a second gear 19, a third rotating shaft 20 is fixedly installed inside the second gear 19, a first bevel gear 21 is fixedly installed at the bottom end of the third rotating shaft 20, one side of the first bevel gear 21 is meshedly connected with a second bevel gear 22, and the second bevel gear 22 is fixedly installed on the outer wall of the second rotating shaft 8.

[0057] When flipping the metal plate, the rotation of the second rotating shaft 8 drives the rotation of the second bevel gear 22, the rotation of the second bevel gear 22 drives the rotation of the first bevel gear 21, the rotation of the first bevel gear 21 drives the rotation of the third rotating shaft 20, the rotation of the third rotating shaft 20 drives the rotation of the second gear 19, the rotation of the second gear 19 drives the movement of the rack plate 18, the movement of the rack plate 18 drives the rotation of the first gear 17, the rotation of the first gear 17 drives the rotation of the reciprocating screw 16, the rotation of the reciprocating screw 16 drives the bearing plate 14 to move downward, leaving space above the bearing plate 14 for the metal plate to flip, thereby improving the stability and reliability of the metal plate when flipping.

[0058] like Figure 6 and Figure 7As shown, the second gear 19 and the first gear 17 are symmetrically arranged on both sides of the rack plate 18 .

[0059] like Figure 3 , Figure 6 and Figure 7 As shown, both ends of the rack plate 18 are provided with protrusions 27 , and the protrusions 27 are fixedly installed inside the detection platform 1 , and the outer wall of the bottom end of the reciprocating screw rod 16 is installed with a coil spring 23 .

[0060] Both ends of the rack plate 18 are inclined, and the inclined surfaces at both ends are in opposite directions;

[0061] When the metal plate turns over, the rack plate 18 moves toward the end close to the protrusion 27. When the rack plate 18 contacts the protrusion 27, it is forced to move downward, so that the tooth block on one side of the rack plate 18 is separated from the second gear 19. Then, the coil spring 23 releases the elastic potential energy to reverse the reciprocating screw rod 16, so that the carrier plate 14 moves up and resets.

[0062] When the reciprocating screw rod 16 is reversed, the rack plate 18 moves in the same manner, and the rack plate 18 contacts the protrusion 27 at the other end and is forced to move upward to mesh with the second gear 19 again.

[0063] A detection method of a metal plate surface defect detection device comprises the following steps:

[0064] S1: When inspecting the surface of a metal plate for defects, the metal plate is first placed on the top of the carrier plate 14, and the two ends of the metal plate are located between the two buffer plates 11. Then, the rotating block 26 is rotated. The rotation of the rotating block 26 drives the rotation of the threaded rod 25. The rotation of the threaded rod 25 drives the movement of one of the support frames 4. The movement of the support frame 4 drives the movement of the fixed plate 6, so that the two fixed plates 6 and the buffer plate 11 clamp and fix the metal plate.

[0065] S2: Then the surface of the metal plate is detected by the detector 3;

[0066] S3: After the detection, the dual-axis motor 10 is started, and the start of the dual-axis motor 10 drives the second rotating shaft 8 to rotate, and the rotation of the second rotating shaft 8 drives the fourth rotating shaft 24 to rotate, and the first rotating shaft 5 is driven to rotate through the pulley group 7, and the rotation of the first rotating shaft 5 drives the fixed plate 6 to rotate, so that the two fixed plates 6 holding the metal plate are turned 180 degrees;

[0067] S4: At the same time, the rotation of the second rotating shaft 8 drives the rotation of the second bevel gear 22, the rotation of the second bevel gear 22 drives the rotation of the first bevel gear 21, the rotation of the first bevel gear 21 drives the rotation of the third rotating shaft 20, the rotation of the third rotating shaft 20 drives the rotation of the second gear 19, the rotation of the second gear 19 drives the movement of the rack plate 18, the movement of the rack plate 18 drives the rotation of the first gear 17, the rotation of the first gear 17 drives the rotation of the reciprocating screw 16, the rotation of the reciprocating screw 16 drives the bearing plate 14 to move downward, so that there is space above the bearing plate 14 for the metal plate to flip;

[0068] S5: At the same time, when the rack plate 18 moves toward one end close to the protrusion 27, the rack plate 18 contacts the protrusion 27 and moves downward under force, so that the tooth block on one side of the rack plate 18 is disengaged from the second gear 19, and then the reciprocating screw rod 16 is reversed by releasing the elastic potential energy through the coil spring 23, so that the bearing plate 14 moves up and resets;

[0069] S6: When the reciprocating screw 16 reverses, similarly, the rack plate 18 moves, and the rack plate 18 contacts the protrusion 27 at the other end and is forced to move upward to re-engage with the second gear 19;

[0070] S7: Then the other side of the metal plate is tested. After the test, the metal plate is taken out to complete the test.

[0071] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A metal plate surface defect detection device, comprising a detection table (1), characterized in that: A detection frame (2) is fixedly mounted on the top of the detection platform (1), a detector (3) is arranged at the bottom of the detection frame (2), and a fixing component and a bearing component are arranged below the detector (3); The fixing assembly comprises a support frame (4) arranged below the detector (3), the support frame (4) being mounted on the top of the detection platform (1), two support frames (4) being symmetrically arranged, one side of each of the two support frames (4) being provided with a fixing plate (6), the fixing plate (6) being connected to the support frame (4) via a flip assembly; One of the support frames (4) is slidably mounted inside the detection platform (1), the internal thread of the support frame (4) is connected to a threaded rod (25), one end of the threaded rod (25) is fixedly mounted with a rotating block (26), and the other support frame (4) is fixedly mounted on the top of the detection platform (1); The flip assembly comprises a first rotating shaft (5) embedded in the two supporting frames (4), one end of the first rotating shaft (5) is fixedly connected to a fixed plate (6), the outer walls of the two first rotating shafts (5) are both installed with a pulley group (7), the inner parts of the two pulley groups (7) away from one end of the first rotating shaft (5) are respectively installed with a fourth rotating shaft (24) and a second rotating shaft (8), the outer wall of the second rotating shaft (8) is evenly provided with limiting rods (9) in a circular array, the limiting rods (9) are embedded in the fourth rotating shaft (24), and the outer wall of the second rotating shaft (8) is installed with a dual-axis motor (10).

2. A metal plate surface defect detection device according to claim 1, characterized in that: The fourth rotating shaft (24) is slidably connected to the limiting rod (9).

3. A metal plate surface defect detection device according to claim 1, characterized in that: A connecting shaft (12) is installed inside the fixing plate (6), and a buffer plate (11) is fixedly installed on one end of the connecting shaft (12) away from the fixing plate (6), and the buffer plate (11) is arranged on one side of the fixing plate (6).

4. A metal plate surface defect detection device according to claim 3, characterized in that: The connecting shaft (12) is slidably mounted inside the fixing plate (6), and a spring (13) is mounted between the connecting shaft (12) and the fixing plate (6).

5. The metal plate surface defect detection device according to claim 3, characterized in that: The connecting shafts (12) are evenly arranged in a ring array.

6. The metal plate surface defect detection device according to claim 1, characterized in that: The bearing assembly comprises a bearing plate (14) arranged below the detector (3), a guide shaft (15) and a reciprocating screw (16) are respectively embedded at the bottom end of the bearing plate (14), and the guide shaft (15) and the reciprocating screw (16) are both mounted on the top end of the detection platform (1).

7. A metal plate surface defect detection device according to claim 6, characterized in that: The bottom end of the reciprocating screw rod (16) is fixedly connected with a first gear (17), one side of the first gear (17) is meshedly connected with a rack plate (18), the other side of the rack plate (18) is meshedly connected with a second gear (19), a third rotating shaft (20) is fixedly installed inside the second gear (19), a first bevel gear (21) is fixedly installed at the bottom end of the third rotating shaft (20), one side of the first bevel gear (21) is meshedly connected with a second bevel gear (22), and the second bevel gear (22) is fixedly installed on the outer wall of the second rotating shaft (8).

8. A metal plate surface defect detection device according to claim 7, characterized in that: The second gear (19) and the first gear (17) are symmetrically arranged on both sides of the rack plate (18).

9. The metal plate surface defect detection device according to claim 7, characterized in that: Both ends of the rack plate (18) are provided with protrusions (27), and the protrusions (27) are fixedly installed inside the detection platform (1). The outer wall of the bottom end of the reciprocating screw rod (16) is installed with a coil spring (23).

10. A detection method for a metal plate surface defect detection device, the method being applicable to a metal plate surface defect detection device as claimed in claims 1 to 9, characterized in that: The following steps are involved: S1: When inspecting the surface of a metal plate for defects, the metal plate is first placed on the top of a carrier plate (14) and the two ends of the metal plate are located between two buffer plates (11). Then, the rotating block (26) is rotated. The rotation of the rotating block (26) drives the rotation of the threaded rod (25). The rotation of the threaded rod (25) drives the movement of one of the support frames (4). The movement of the support frame (4) drives the movement of the fixed plate (6), so that the two fixed plates (6) and the buffer plate (11) clamp and fix the metal plate. S2: Then the surface of the metal plate is inspected by the detector (3); S3: After the detection, the double-axis motor (10) is started, and the start of the double-axis motor (10) drives the second rotating shaft (8) to rotate, and the rotation of the second rotating shaft (8) drives the fourth rotating shaft (24) to rotate, and the first rotating shaft (5) is driven to rotate through the pulley group (7), and the rotation of the first rotating shaft (5) drives the fixed plate (6) to rotate, so that the two fixed plates (6) holding the metal plate are turned 180 degrees; S4: At the same time, the rotation of the second rotating shaft (8) drives the rotation of the second bevel gear (22), the rotation of the second bevel gear (22) drives the rotation of the first bevel gear (21), the rotation of the first bevel gear (21) drives the rotation of the third rotating shaft (20), the rotation of the third rotating shaft (20) drives the rotation of the second gear (19), the rotation of the second gear (19) drives the movement of the rack plate (18), the movement of the rack plate (18) drives the rotation of the first gear (17), the rotation of the first gear (17) drives the rotation of the reciprocating screw (16), the rotation of the reciprocating screw (16) drives the bearing plate (14) to move downward, so that space is left above the bearing plate (14) for the metal plate to flip over; S5: At the same time, when the rack plate (18) moves toward one end close to the protrusion (27), the rack plate (18) contacts the protrusion (27) and moves downward under force, so that the tooth block on one side of the rack plate (18) is disengaged from the second gear (19), and then the reciprocating screw rod (16) is reversed by releasing the elastic potential energy through the coil spring (23), so that the bearing plate (14) moves up and resets; S6: When the reciprocating screw (16) is reversed, the rack plate (18) moves in the same manner, and the rack plate (18) contacts the protrusion (27) at the other end and is forced to move upward to re-engage with the second gear (19); S7: Then the other side of the metal plate is tested. After the test, the metal plate is taken out to complete the test.

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