Visual inspection device with automatic positioning and focusing functions and inspection method thereof

Abstract

The invention relates to a visual detection device with an automatic positioning and focusing function and a detection method thereof, the visual detection device comprises a case, a conveying roller, a positioning mechanism, an adjusting mechanism and a detection mechanism, the conveying roller is mounted on the case, and the positioning mechanism, the adjusting mechanism and the detection mechanism are respectively mounted in the case; a lifting rod of the supporting assembly and a lifting rod of the clamping assembly make contact with the outer wall of a workpiece, the lifting rod drives a piston to move in an air cavity according to the situation of the outer wall of the workpiece, tight clamping of the workpiece is achieved through elastic deformation of a spring and the lifting rod, and the supporting assembly can conveniently support and position the workpieces of different shapes and different placement angles. And the clamping assembly facilitates clamping of workpieces in different shapes, and movement and rotation adjustment of the workpieces are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of visual detection, and in particular to a visual detection device with automatic positioning and focusing functions and a detection method thereof. Background Art

[0002] Visual inspection is to use machines instead of human eyes to make measurements and judgments, conduct all-round inspections on finished products, distinguish qualified products from unqualified products, and eliminate unqualified products from the product.

[0003] Before testing, different workpieces need to be fixed on the testing table. Different workpieces have different fixing support points, so different firmware tools need to be used for fixing. After fixing, when the placement angle of the tooling is changed, the firmware tooling needs to be replaced, which makes the workpiece fixing and replacement operations complicated. During the testing process, the workpiece needs to be adjusted in multiple postures, otherwise there will easily be blind spots in the testing. At the same time, the internal space of the existing device is limited, so a separate robotic arm or manual operation is required on the outside of the device to load and unload the workpiece. Summary of the invention

[0004] The problem solved by the present invention is to provide a visual inspection device with automatic positioning and focusing functions and a detection method thereof, which solves the problem that different workpieces need to be fixed on a detection table before detection. Different workpieces have different fixing support points, so different firmware tools need to be used for fixing. After fixation, when the placement angle of the tooling is changed, the firmware tooling needs to be replaced, which makes the fixation and replacement operations of the workpiece complicated. During the detection process, the workpiece needs to be adjusted in multiple postures, otherwise there will easily be blind spots in the detection. At the same time, the internal space of the existing device is limited, so a separate robotic arm needs to be equipped on the outside of the device or manual operation is required to perform loading and unloading operations of the workpiece.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A visual inspection device with automatic positioning and focusing function, comprising a chassis, a conveying roller, a positioning mechanism, an adjusting mechanism and a detecting mechanism, wherein the chassis is provided with a conveying roller, and the chassis is provided with a positioning mechanism, an adjusting mechanism and a detecting mechanism respectively;

[0007] The positioning mechanism comprises an electric rotating seat, and a supporting assembly is installed at the rotating end of the electric rotating seat;

[0008] The adjustment mechanism includes a symmetrically arranged first pneumatic rotating seat, an adjustment seat is installed on the rotating end of the first pneumatic rotating seat, a translation plate is slidably installed on the adjustment seat, a guide rail is arranged on the translation plate, and a sliding seat is slidably installed on the guide rail, a cylinder frame is installed on the sliding seat, a pneumatic cylinder is installed in the cylinder frame, a second pneumatic rotating seat is installed on the telescopic end of the pneumatic cylinder, and a clamping assembly is installed on the rotating end of the second pneumatic rotating seat.

[0009] Preferably, the supporting assembly and the clamping assembly have the same structure and both include a base, a plurality of air cavities interconnected with each other are provided in the base, the plurality of air cavities in the base are connected with the outside through control valves, a spring is installed in the air cavity, a piston is installed at the top of the spring, a lifting rod is installed at the top of the piston, and the top of the lifting rod is located outside the base.

[0010] Preferably, a slide groove flush with the guide rail is provided on the adjustment seat, a first motor is installed at the end of the adjustment seat, and a first threaded rod is installed in the slide groove at the output end of the first motor.

[0011] Preferably, the first threaded rod is threadably connected to the slider, and the slider is connected to the translation plate.

[0012] Preferably, synchronous wheels are respectively installed at both ends of the outer side of the translation plate, and the two synchronous wheels are connected through a synchronous belt transmission. The first belt clamp and the second belt clamp are respectively installed at both ends of the synchronous belt. The first belt clamp is connected to the fixed arm of the side wall of the adjustment seat, and the second belt clamp is connected to the sliding seat.

[0013] Preferably, the detection mechanism comprises a first support frame and a second support frame which are vertically arranged, a second motor is installed at the end of the first support frame, a second threaded rod is installed at the output end of the second motor, and the second threaded rod is threadedly connected to the second support frame.

[0014] Preferably, a third motor is installed at the bottom end of the second supporting frame, and a third threaded rod is installed at the output end of the third motor located in the second supporting frame.

[0015] Preferably, the third threaded rod is threadably connected to the slide, and a focus camera is mounted on the slide, wherein the focus camera includes a distance measurement module.

[0016] A detection method for a visual detection device with automatic positioning and focusing function, the specific operation steps of the detection method are as follows:

[0017] Step 1: The workpiece to be inspected is transported on the conveying roller, and the adjusting seat is rotated to a horizontal state through the first pneumatic rotating seat. At this time, the first motor drives the first threaded rod to rotate, and then drives the translation plate to move through the threaded sliding block. When the translation plate moves, the first belt clamp connected to the fixed arm acts on the synchronous belt, driving the synchronous belt to transmit on the two synchronous wheels. The transmitted synchronous belt drives the slide seat to move along the guide rail through the second belt clamp until the second pneumatic rotating seat and the clamping assembly extend out of the chassis, and the two clamping assemblies are located on both sides of the workpiece. The clamping assembly is driven to move by the pneumatic cylinder, and the control valve is opened. The lifting rod contacts the outer wall of the workpiece and moves. The lifting rods at different parts drive the pistons to move at different distances in the air cavity, and the elastic deformation of the spring ensures that the lifting rods at different parts contact the outer wall of the workpiece. Then the control valve is closed. At this time, the workpiece is clamped by the support assembly.

[0018] Step 2: The first motor works to move the workpiece to the top of the positioning mechanism. At this time, the first pneumatic rotating seat drives the adjusting seat to rotate vertically downward. At the same time, the second pneumatic rotating seat drives the clamping assembly to rotate, and the clamping assembly and the adjusting seat rotate in opposite directions at the same speed. Then the first motor works to drive the second pneumatic rotating seat, the clamping assembly and the workpiece to move downward, and the workpiece is placed on the supporting assembly. At this time, the pneumatic cylinder contracts, the clamping assembly is separated from the workpiece, the control valve of the supporting assembly is opened, the bottom of the workpiece contacts the lifting rod, and then the lifting rod is telescopically adjusted, the control valve is closed, and the workpiece is supported and positioned by the positioning mechanism;

[0019] Step three: The distance between the focus camera and the workpiece is sensed by the distance measuring module in the focus camera, and the second motor is used to drive the second threaded rod to rotate, thereby driving the second support frame connected by the thread to rise and fall, and the third motor is used to drive the third threaded rod to rotate, thereby driving the slide connected by the thread to rise and fall, so as to adjust the distance between the focus camera and the workpiece and adjust the height of the focus camera at the same time. Then the electric rotating seat works to realize the rotation of the workpiece, thereby completing the visual inspection of the workpiece, flipping and rotating the workpiece through the adjusting mechanism, adjusting the placement position of the workpiece in the positioning mechanism, and after the visual inspection is completed, placing the workpiece on the conveyor roller through the adjusting mechanism for continued conveying.

[0020] The beneficial effects of the present invention are as follows: the lifting rods of the support assembly and the clamping assembly are in contact with the outer wall of the workpiece, and according to the outer wall of the workpiece, the lifting rod drives the piston to move in the air cavity, and the lifting rod realizes the tight clamping of the workpiece through the elastic deformation of the spring, and the support assembly is convenient for supporting and positioning workpieces of different shapes and different placement angles, and is convenient for comprehensive multi-angle visual inspection, and the clamping assembly is convenient for clamping workpieces of different shapes, and is convenient for moving and rotating the workpiece;

[0021] The rotation of the adjustment seat is realized by the first pneumatic rotating seat. When the adjustment seat is rotated to a horizontal state, it is convenient to perform translation when loading and unloading the workpiece. When the adjustment seat is rotated to a vertical state, it is convenient to adjust the height of the clamping assembly to match the workpiece, that is, adjust the height of the clamping assembly, and then match the clamping assembly with the workpiece before and after flipping and rotating the clamping assembly.

[0022] The first motor drives the first threaded rod to rotate, and then drives the translation plate to move through the threaded slider. When the translation plate moves, the first belt clamp connected to the fixed arm acts on the synchronous belt, driving the synchronous belt to transmit on the two synchronous wheels. The transmission synchronous belt drives the slide to move along the guide rail through the second belt clamp. The movement distance of the slide is twice the movement distance of the translation plate. Under the premise that the length of the adjustment seat remains unchanged, the movement distance of the slide is greatly increased.

[0023] The clamping assembly is driven to rotate and flip by the second pneumatic rotating seat, thereby adjusting the angle of the workpiece in multiple directions, so as to facilitate visual inspection of the workpiece in multiple positions and angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the positioning mechanism structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the regulating mechanism of the present invention;

[0027] Figure 4 It is a side view of the adjustment mechanism of the present invention;

[0028] Figure 5 This is a schematic diagram of the slide installation structure of the present invention;

[0029] Figure 6 It is a schematic diagram of the structure of the detection mechanism of the present invention.

[0030] Legend:

[0031] 1. Chassis; 2. Conveying roller; 3. Positioning mechanism; 4. Adjusting mechanism; 5. Detecting mechanism; 6. Electric rotating seat; 7. Support assembly; 8. Base; 9. Air cavity; 10. Spring; 11. Piston; 12. Lifting rod; 13. First pneumatic rotating seat; 14. Adjusting seat; 15. Translation plate; 16. Guide rail; 17. Slide seat; 18. Cylinder frame; 19. Pneumatic cylinder; 20. Second pneumatic rotating seat; 21. Clamping assembly; 22. Slide slot; 23. First motor; 24. First threaded rod; 25. Sliding block; 26. Synchronous wheel; 27. Synchronous belt; 28. First belt clamp; 29. ​​Fixed arm; 30. Second belt clamp; 31. First supporting frame; 32. Second motor; 33. Second threaded rod; 34. Second supporting frame; 35. Third motor; 36. Third threaded rod; 37. Slide; 38. Focus camera. DETAILED DESCRIPTION

[0032] 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.

[0033] Specific examples are given below.

[0034] See also Figure 1 to Figure 6 , a visual inspection device with automatic positioning and focusing function, comprising a chassis 1, a conveying roller 2, a positioning mechanism 3, an adjusting mechanism 4 and a detecting mechanism 5, the chassis 1 is provided with the conveying roller 2, and the chassis 1 is provided with the positioning mechanism 3, the adjusting mechanism 4 and the detecting mechanism 5 respectively;

[0035] The positioning mechanism 3 includes an electric rotating seat 6, and a supporting assembly 7 is installed at the rotating end of the electric rotating seat 6. The supporting assembly 7 and the clamping assembly 21 have the same structure and both include a base 8. A plurality of air cavities 9 that are interconnected are opened in the base 8. The plurality of air cavities 9 in the base 8 are connected to the outside through a control valve. A spring 10 is installed in the air cavity 9, and a piston 11 is installed at the top of the spring 10. A lifting rod 12 is installed at the top of the piston 11, and the top of the lifting rod 12 is located outside the base 8. According to the outer wall condition of the workpiece, the lifting rod 12 drives the piston 11 to move in the air cavity 9. Through the elastic deformation of the spring 10, the lifting rod 12 realizes a tight engagement with the workpiece. The supporting assembly 7 is convenient for supporting and positioning workpieces of different shapes and different placement angles, and is convenient for comprehensive and multi-angle visual inspection. The clamping assembly 21 is convenient for clamping workpieces of different shapes, and is convenient for moving and rotating the workpiece;

[0036] The adjustment mechanism 4 includes a symmetrically arranged first pneumatic rotating seat 13, an adjustment seat 14 is installed at the rotating end of the first pneumatic rotating seat 13, a translation plate 15 is slidably installed on the adjustment seat 14, a guide rail 16 is arranged on the translation plate 15, and a slide seat 17 is slidably installed on the guide rail 16, a cylinder frame 18 is installed on the slide seat 17, a pneumatic cylinder 19 is installed in the cylinder frame 18, a second pneumatic rotating seat 20 is installed at the telescopic end of the pneumatic cylinder 19, a clamping assembly 21 is installed at the rotating end of the second pneumatic rotating seat 20, a slide groove 22 flush with the guide rail 16 is opened on the adjustment seat 14, a first motor 23 is installed at the end of the adjustment seat 14, and a first threaded rod 24 is installed in the slide groove 22 at the output end of the first motor 23 The first threaded rod 24 is threadedly connected to the slider 25, and the slider 25 is connected to the translation plate 15. Synchronous wheels 26 are respectively installed at both ends of the outer side of the translation plate 15, and the two synchronous wheels 26 are connected through a synchronous belt 27. The first belt clamp 28 and the second belt clamp 30 are respectively installed at both ends of the synchronous belt 27. The first belt clamp 28 is connected to the fixed arm 29 of the side wall of the adjustment seat 14, and the second belt clamp 30 is connected to the slide seat 17. The adjustment seat 14 is rotated to a horizontal state through the first pneumatic rotating seat 13. At this time, the first threaded rod 24 is driven to rotate by the first motor 23, and then the translation plate 15 is driven to move through the threaded slider 25. When the translation plate 15 moves, the first belt clamp connected to the fixed arm 29 The clamp 28 acts on the synchronous belt 27, driving the synchronous belt 27 to transmit on the two synchronous wheels 26. The transmitted synchronous belt 27 drives the slide 17 to move along the guide rail 16 through the second belt clamp 30 until the second pneumatic rotating seat 20 and the clamping assembly 21 extend out of the chassis 1, and the two clamping assemblies 21 are located on both sides of the workpiece. The clamping assembly 21 is driven to move by the pneumatic cylinder 19, and the control valve is opened. The lifting rod 12 contacts and moves with the outer wall of the workpiece. The lifting rods 12 at different positions drive the piston 11 to move at different distances in the air cavity 9, and the elastic deformation of the spring 10 is used to ensure that the lifting rods 12 at different positions contact with the outer wall of the workpiece, and then the control valve is closed. At this time, the workpiece is completed through the support assembly 7. For clamping, the first motor 23 works to move the workpiece to above the positioning mechanism 3. At this time, the first pneumatic rotating seat 13 drives the adjusting seat 14 to rotate vertically downward. At the same time, the second pneumatic rotating seat 20 drives the clamping assembly 21 to rotate, and the clamping assembly 21 and the adjusting seat 14 rotate in the same direction at the same speed. Then the first motor 23 works to drive the second pneumatic rotating seat 20, the clamping assembly 21 and the workpiece to move downward, and place the workpiece on the supporting assembly 7. At this time, the pneumatic cylinder 19 contracts, the clamping assembly 21 separates from the workpiece, the control valve of the supporting assembly 7 opens, the bottom of the workpiece contacts the lifting rod 12, and then the lifting rod 12 is telescopically adjusted, the control valve is closed, and the workpiece is supported and positioned by the positioning mechanism 3.

[0037] The detection mechanism 5 includes a first support frame 31 and a second support frame 34 which are vertically arranged. A second motor 32 is installed at the end of the first support frame 31. A second threaded rod 33 is installed at the output end of the second motor 32, and the second threaded rod 33 is threadedly connected to the second support frame 34. A third motor 35 is installed at the bottom end of the second support frame 34. The output end of the third motor 35 is located in the second support frame 34 and a third threaded rod 36 is installed therein. The third threaded rod 36 is threadedly connected to a slide 37, and a focus camera 38 is installed on the slide 37. The focus camera 38 includes a distance measuring module. The distance measuring module in the focus camera 38 is used to sense the distance between the focus camera 38 and the workpiece. The second motor 32 drives the second threaded rod 33 to rotate, thereby driving the threaded second support frame 34 to rise and fall. The third motor 35 drives the third threaded rod 36 to rotate, thereby driving the threaded slide 37 to rise and fall, thereby adjusting the distance between the focus camera 38 and the workpiece and adjusting the height of the focus camera 38.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A visual inspection device with automatic positioning and focusing function, characterized in that: The invention comprises a chassis (1), a conveying roller (2), a positioning mechanism (3), an adjusting mechanism (4) and a detecting mechanism (5); the conveying roller (2) is installed on the chassis (1), and the positioning mechanism (3), the adjusting mechanism (4) and the detecting mechanism (5) are installed inside the chassis (1); The positioning mechanism (3) comprises an electric rotating seat (6), and a supporting assembly (7) is installed at the rotating end of the electric rotating seat (6); The adjustment mechanism (4) comprises a first pneumatic rotating seat (13) which is symmetrically arranged, an adjustment seat (14) being installed at the rotating end of the first pneumatic rotating seat (13), a translation plate (15) being slidably installed on the adjustment seat (14), a guide rail (16) being arranged on the translation plate (15), and a slide seat (17) being slidably installed on the guide rail (16), a cylinder frame (18) being installed on the slide seat (17), a pneumatic cylinder (19) being installed in the cylinder frame (18), a second pneumatic rotating seat (20) being installed at the telescopic end of the pneumatic cylinder (19), and a clamping assembly (21) being installed at the rotating end of the second pneumatic rotating seat (20).

2. A visual inspection device with automatic positioning and focusing function according to claim 1, characterized in that: The supporting assembly (7) and the clamping assembly (21) have the same structure and both include a base (8). A plurality of air cavities (9) which are interconnected are provided in the base (8). The plurality of air cavities (9) in the base (8) are connected to the outside through control valves. A spring (10) is installed in the air cavity (9). A piston (11) is installed at the top of the spring (10). A lifting rod (12) is installed at the top of the piston (11), and the top of the lifting rod (12) is located outside the base (8).

3. A visual inspection device with automatic positioning and focusing function according to claim 2, characterized in that: The adjusting seat (14) is provided with a slide groove (22) flush with the guide rail (16); a first motor (23) is installed at the end of the adjusting seat (14); and a first threaded rod (24) is installed in the slide groove (22) at the output end of the first motor (23).

4. A visual inspection device with automatic positioning and focusing function according to claim 3, characterized in that: The first threaded rod (24) is threadedly connected to the slider (25), and the slider (25) is connected to the translation plate (15).

5. A visual inspection device with automatic positioning and focusing function according to claim 4, characterized in that: Synchronous wheels (26) are respectively installed at the two ends of the outer side of the translation plate (15), and the two synchronous wheels (26) are connected through a synchronous belt (27). A first belt clamp (28) and a second belt clamp (30) are respectively installed at the two ends of the synchronous belt (27). The first belt clamp (28) is connected to a fixed arm (29) on the side wall of the adjustment seat (14), and the second belt clamp (30) is connected to the slide seat (17).

6. A visual inspection device with automatic positioning and focusing function according to claim 5, characterized in that: The detection mechanism (5) comprises a first support frame (31) and a second support frame (34) which are arranged vertically, a second motor (32) being mounted on the end of the first support frame (31), a second threaded rod (33) being mounted on the output end of the second motor (32), and the second threaded rod (33) being threadedly connected to the second support frame (34).

7. A visual inspection device with automatic positioning and focusing function according to claim 6, characterized in that: A third motor (35) is installed at the bottom end of the second support frame (34); an output end of the third motor (35) is located inside the second support frame (34) and is installed with a third threaded rod (36).

8. The visual inspection device with automatic positioning and focusing function according to claim 7, characterized in that: The third threaded rod (36) is threadedly connected to the slide (37), and a focus camera (38) is installed on the slide (37), wherein the focus camera (38) includes a distance measurement module.

9. The detection method of a visual detection device with automatic positioning and focusing function according to claim 8, characterized in that: The specific steps of this detection method are as follows: Step 1: The workpiece to be inspected is transported on the conveying roller (2), and the adjusting seat (14) is rotated to a horizontal state through the first pneumatic rotating seat (13). At this time, the first motor (23) drives the first threaded rod (24) to rotate, and then drives the translation plate (15) to move through the threaded slider (25). When the translation plate (15) moves, the first belt clamp (28) connected to the fixed arm (29) acts on the synchronous belt (27), driving the synchronous belt (27) to transmit on the two synchronous wheels (26), and the transmitted synchronous belt (27) drives the slide seat (17) along the guide rail through the second belt clamp (30). (16) moves until the second pneumatic rotating seat (20) and the clamping assembly (21) extend out of the chassis (1), and the two clamping assemblies (21) are located on both sides of the workpiece. The clamping assembly (21) is driven to move by the operation of the pneumatic cylinder (19), and the control valve is opened. The lifting rod (12) contacts and moves with the outer wall of the workpiece. The lifting rods (12) at different positions drive the piston (11) to move at different distances in the air chamber (9), and the elastic deformation of the spring (10) ensures that the lifting rods (12) at different positions contact with the outer wall of the workpiece. Then the control valve is closed. At this time, the workpiece is clamped by the support assembly (7); Step 2: The first motor (23) operates to move the workpiece to the top of the positioning mechanism (3). At this time, the first pneumatic rotating seat (13) drives the adjusting seat (14) to rotate vertically downward. At the same time, the second pneumatic rotating seat (20) drives the clamping assembly (21) to rotate, and the clamping assembly (21) and the adjusting seat (14) rotate in opposite directions at the same speed. Then, the first motor (23) operates to drive the second pneumatic rotating seat (20), the clamping assembly (21) and the workpiece to move downward, and the workpiece is placed on the supporting assembly (7). At this time, the pneumatic cylinder (19) contracts, the clamping assembly (21) is separated from the workpiece, the control valve of the supporting assembly (7) is opened, and the bottom of the workpiece contacts the lifting rod (12). Then, the lifting rod (12) is telescopically adjusted, and the control valve is closed. The workpiece is supported and positioned by the positioning mechanism (3); Step 3: The distance between the focus camera (38) and the workpiece is sensed by the distance measuring module in the focus camera (38), and the second threaded rod (33) is driven to rotate by the second motor (32), thereby driving the threaded second support frame (34) to rise and fall, and the third threaded rod (36) is driven to rotate by the third motor (35), thereby driving the threaded slide (37) to rise and fall, thereby adjusting the distance between the focus camera (38) and the workpiece and adjusting the height of the focus camera (38), and then the electric rotating seat (6) works to realize the rotation of the workpiece, thereby completing the visual inspection of the workpiece, flipping and rotating the workpiece by the adjustment mechanism (4), adjusting the placement position of the workpiece on the positioning mechanism (3), and after the visual inspection is completed, placing the workpiece on the conveying roller (2) through the adjustment mechanism (4) for continued conveying.

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