Workpiece flaw detection device based on machine vision

Abstract

The invention relates to the technical field of visual inspection, and discloses a machine vision-based workpiece flaw detection device which comprises a rack frame, a conveying assembly for conveying cylindrical workpieces is arranged in the rack frame, a feeding assembly is arranged on one side of the top of the rack frame, and a visual inspection mechanism is arranged at the top of the rack frame. And a removing assembly is arranged above the rack frame. According to the workpiece flaw detection device based on machine vision, flaws at the two ends of a cylindrical workpiece horizontally conveyed on the conveying belt can be automatically detected through the two first visual detectors, and the visual detection mechanism can be matched with rotary conveying of the conveying belt, so that the workpiece rotates in the conveying process; furthermore, flaws on the outer surfaces of the cylindrical workpieces directionally rotating on the conveying belt can be automatically detected through the second visual detector, the all-directional three-dimensional flaw detection function is achieved, the work efficiency of workpiece flaw detection is improved, and the energy-saving and environment-friendly properties of flaw detection equipment are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of visual inspection, and in particular to a workpiece defect inspection device based on machine vision. Background Art

[0002] Since bumps and scratches are unavoidable during the production process of metal workpieces, there are sometimes defects such as dents and scratches on the surface of metal workpieces. In order to ensure that the quality of the workpieces meets the standards, it is generally necessary to perform defect inspection on the metal workpieces after production. Surface defect inspection of metal workpieces usually uses high-resolution cameras for visual inspection.

[0003] After searching, the Chinese invention patent with publication number CN117884377B discloses an industrial robot detection device based on machine vision, which utilizes a limit structure in combination with a conveying unit to realize the reception, adjustment, clamping and rotation of the workpiece, and cooperates with a visual detector to perform all-round imaging detection; in order to perform all-round detection of cylindrical metal workpieces, the defect detection equipment needs to switch the position of the workpiece back and forth. By setting different numbers of conversion mechanisms, not only the continuity of visual detection is reduced, but also the energy saving and environmental protection of the detection equipment are reduced. In addition, it is not convenient to accurately position the workpiece when the workpiece is transported back and forth, which can easily affect the effect of its defect detection. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a workpiece defect detection device based on machine vision, which can automatically detect defects at both ends of a cylindrical workpiece horizontally conveyed on a conveyor belt through two first visual detectors, and can also cooperate with the rotating conveying of the conveyor belt through the visual detection mechanism to make the workpiece rotate during the conveying process, and then can automatically detect defects on the outer surface of the cylindrical workpiece that is directionally rotating on the conveyor belt through the second visual detector. It not only has an all-round three-dimensional defect detection function, but also does not require repeated back and forth transportation of the workpiece during inspection, thereby improving the work efficiency of workpiece defect detection and the energy saving and environmental protection of the defect detection equipment, and solves the problems of low detection continuity performance of existing defect detection equipment and inconvenience in precise positioning of the workpiece.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a workpiece defect detection device based on machine vision, comprising a frame, a conveying assembly for conveying a cylindrical workpiece is arranged inside the frame, a loading assembly is arranged on one side of the top of the frame, a visual detection mechanism is arranged on the top of the frame, and a rejection assembly is arranged above the frame;

[0008] The conveying assembly includes two transmission rollers rotatably connected to the inside of the frame and a conveyor belt connected by the two transmission rollers, and a motor for rotating and driving one of the transmission rollers is arranged on the back of the frame;

[0009] The visual inspection mechanism includes a U-shaped frame fixed on a rack frame, and both sides of the U-shaped frame are fixedly connected with a first visual detector for visually inspecting the two ends of the cylindrical workpiece, and the top of the U-shaped frame is fixedly connected with a second visual detector for visually inspecting the outer surface of the cylindrical workpiece through a bracket.

[0010] Preferably, a support plate for supporting the upper surface of the conveyor belt is fixedly connected to the interior of the frame;

[0011] The support plate is made of a magnetic material that can magnetically adsorb the cylindrical workpiece. A magnetic isolation layer is provided on the top of the support plate, and the magnetic isolation layer is located in the detection area of ​​the outer surface of the cylindrical workpiece.

[0012] Preferably, a U-shaped rod is slidably connected to the inside of the frame frame through two sliding frames, and a directional roller for intercepting the cylindrical workpiece on the conveyor belt is rotatably connected to the top of the U-shaped rod, and a driving member for driving the directional roller up and down is provided on the frame frame;

[0013] The driving member comprises a U-shaped frame fixed to the bottom of the frame frame, the bottom of the U-shaped frame is rotatably connected with a transmission shaft, and the transmission shaft is connected to one of the transmission rollers through two belt groups;

[0014] An eccentric wheel is fixedly connected to the outer surface of the transmission shaft, a movable frame is slidably connected to the bottom of the U-shaped frame, and two inclined connecting frames are hinged between the bottom of the movable frame and the bottom end of the U-shaped rod, and a spring for elastically squeezing the movable frame is fixedly connected to the bottom of the U-shaped frame through a bracket.

[0015] Preferably, the rejection assembly includes a U-shaped mounting frame fixed to one side of the top of the U-shaped frame, one end of the U-shaped mounting frame is slidably connected to a lifting member for lifting the cylindrical workpiece, and the top of the rack frame is fixedly connected to a rejection export frame.

[0016] Preferably, the lifting member includes a U-shaped bracket slidably connected to one end of the U-shaped mounting frame, arc-shaped support plates are provided at both ends of the bottom of the U-shaped bracket, and an inclined electric cylinder is hinged between the top of the U-shaped mounting frame and the top of the U-shaped bracket.

[0017] Preferably, the two arc-shaped support plates are rotatably connected to the bottom of the U-shaped bracket by a rotating shaft, and the rotating ends of the two arc-shaped support plates are installed with torsion springs;

[0018] One end of the two rotating shafts is fixedly connected with an inclined toggle block, and both sides of the rejection and lead-out frame are fixedly connected with an L-shaped limit rod.

[0019] Preferably, the feeding assembly includes a cylindrical cylinder mounted above the frame through a bracket, and the top of the cylindrical cylinder is fixedly connected to a material collection bin, the bottom of the cylindrical cylinder is fixedly connected to a material guide frame, and a positioning plate is hinged on one side of the bottom of the material guide frame.

[0020] Preferably, the cylindrical barrel is rotatably connected to a rotating shaft inside, and a cylindrical block is fixedly connected to the outer surface of the rotating shaft, and the outer surface of the cylindrical block is provided with a plurality of notches equal to the diameter of the cylindrical workpiece;

[0021] A speed reducer is installed on the frame, and one end of a driving roller is drivingly connected to one end of a rotating shaft through the speed reducer.

[0022] (III) Beneficial effects

[0023] Compared with the prior art, the present invention provides a workpiece defect detection device based on machine vision, which has the following beneficial effects:

[0024] 1. The present invention is used for horizontally conveying cylindrical workpieces that need to be inspected through the arrangement of a conveying assembly. The two first visual detectors in the visual inspection mechanism can automatically detect defects at both ends of the cylindrical workpiece horizontally conveyed on the conveyor belt. The arrangement of the visual inspection mechanism can cooperate with the rotating conveying of the conveyor belt to allow the workpiece to rotate during the conveying process. Then, the second visual detector can automatically detect defects on the outer surface of the cylindrical workpiece that is directionally rotating on the conveyor belt. The present invention not only has an all-round three-dimensional defect detection function, but also does not require repeated back and forth transportation of the workpiece during inspection, thereby improving the work efficiency of workpiece defect detection and the energy-saving and environmental protection of the defect detection equipment.

[0025] 2. The present invention adopts two groups of belt groups through the transmission shaft to rotate with one of the transmission rollers, so that when the conveyor belt is driven to rotate by the transmission roller, the transmission shaft in the driving member can be synchronously driven to rotate, so that the subsequent driving member can lift and reciprocate the directional roller, and has a good transmission function, so that when the cylindrical workpiece is transported by the conveyor belt, the cylindrical workpiece can be intercepted by the directional roller to make the cylindrical workpiece rotate in a directional manner, so as to facilitate the detection of defects on the outer surface of the cylindrical workpiece by the second visual detector. By lifting the directional roller, the interception of the cylindrical workpiece can be lost, so that the cylindrical workpiece is continuously transported, thereby improving the continuity of the defect detection of the cylindrical workpiece and the work efficiency of the defect detection.

[0026] 3. In the present invention, one end of one of the transmission rollers is connected to one end of the rotating shaft through a speed reducer, so that when the conveying component conveys the cylindrical workpiece, the rotating shaft can be synchronously driven to rotate. The rotation of the rotating shaft can drive the cylindrical block to rotate, and the rotation of the cylindrical block can drive a number of recesses to change positions, thereby driving the cylindrical workpiece inside the recess to move, thereby forming an automatic loading operation with good continuity, which improves the convenience of defect detection of cylindrical workpieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a workpiece defect detection device based on machine vision of the present invention;

[0028] Figure 2 For the present invention Figure 1 A bottom view of the structure of a workpiece defect detection device based on machine vision;

[0029] Figure 3 For the present invention Figure 1 The rear view of the structure of the workpiece defect detection device based on machine vision;

[0030] Figure 4 For the present invention Figure 1 Structural cross-sectional view of the middle rack frame;

[0031] Figure 5 For the present invention Figure 1 Schematic diagram of the combination of visual inspection mechanism and rejection component;

[0032] Figure 6 For the present invention Figure 5 Schematic diagram of the structure of the middle U-shaped frame;

[0033] Figure 7 For the present invention Figure 1 Schematic diagram of the structure of the rejection component;

[0034] Figure 8 For the present invention Figure 7 Structural schematic diagram of the middle arc-shaped support plate;

[0035] Fig. 9 For the present invention Figure 5 A schematic diagram of the structure of the middle driving part;

[0036] Fig.10 For the present invention Fig. 9 A bottom view of the structure of the middle driving member;

[0037] Fig.11 For the present invention Figure 1 Schematic cross-section of the loading assembly.

[0038] In the figure: 1. Rack frame; 2. Columnar workpiece;

[0039] 3. Conveying assembly; 31. Driving roller; 32. Conveying belt; 33. Motor; 34. Support plate; 35. Magnetic isolation layer;

[0040] 4. Feeding assembly; 41. Columnar barrel; 42. Material collection bin; 43. Material guide frame; 44. Positioning plate; 45. Rotating shaft; 46. Columnar block;

[0041] 5. Visual inspection mechanism; 51. U-shaped frame; 52. First visual detector; 53. Second visual detector; 54. U-shaped rod; 55. Orienting roller;

[0042] 56, driving member; 561, U-shaped frame; 562, transmission shaft; 563, belt set; 564, eccentric wheel; 565, movable frame; 566, connecting frame; 567, spring;

[0043] 6. Remove components; 61. U-shaped mounting frame; 62. Remove export frame;

[0044] 63, lifting member; 631, U-shaped bracket; 632, arc-shaped support plate; 633, electric cylinder; 634, rotating shaft; 635, torsion spring; 636, toggle block; 637, L-shaped limit rod;

[0045] 7. Speed ​​reducer. DETAILED DESCRIPTION

[0046] 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.

[0047] Embodiment 1:

[0048] See attached Figures 1 to 11 , a workpiece defect detection device based on machine vision, comprising a frame frame 1, a conveying assembly 3 for conveying a cylindrical workpiece 2 is arranged inside the frame frame 1, a feeding assembly 4 is arranged on one side of the top of the frame frame 1, a visual detection mechanism 5 is arranged on the top of the frame frame 1, and a rejection assembly 6 is arranged above the frame frame 1;

[0049] The conveying component 3 is used to horizontally convey the cylindrical workpiece 2 to be inspected, and the visual inspection mechanism 5 arranged on the horizontal conveying path can perform defect inspection on the cylindrical workpiece 2. The rejecting component 6 is used to reject unqualified products detected by the visual inspection mechanism 5.

[0050] The conveying assembly 3 includes two transmission rollers 31 rotatably connected to the inside of the frame 1 and a conveying belt 32 connected by the two transmission rollers 31. The back of the frame 1 is provided with a motor 33 for rotating and driving one of the transmission rollers 31.

[0051] The motor 33 is connected to an external power source and a control switch, and is used to drive one of the transmission rollers 31 to rotate. Through the rotation of the transmission roller 31, the conveyor belt 32 can be driven to rotate in coordination with the other transmission roller 31, thereby forming a horizontal conveying operation of the cylindrical workpiece 2.

[0052] The visual inspection mechanism 5 includes a U-shaped frame 51 fixed on the frame frame 1, and both sides of the U-shaped frame 51 are fixedly connected with a first visual detector 52 for visually inspecting the two ends of the cylindrical workpiece 2, and the top of the U-shaped frame 51 is fixedly connected with a second visual detector 53 for visually inspecting the outer surface of the cylindrical workpiece 2 through a bracket;

[0053] By setting up two first visual detectors 52 in the visual inspection mechanism 5, defects at both ends of the cylindrical workpiece 2 horizontally conveyed on the conveyor belt 32 can be automatically detected. By setting up the second visual detector 53, defects on the outer surface of the cylindrical workpiece 2 directionally rotating on the conveyor belt 32 can be automatically detected, and it has a full-dimensional three-dimensional defect detection function.

[0054] See attached Figure 4 A support plate 34 for supporting the upper surface of the conveyor belt 32 is fixedly connected to the interior of the frame 1;

[0055] The support plate 34 is provided to support the upper layer of the conveyor belt 32, thereby ensuring the stability of the conveyor belt 32 in supporting a plurality of cylindrical workpieces 2;

[0056] The support plate 34 is made of a magnetic material that can magnetically adsorb the cylindrical workpiece 2. A magnetic isolation layer 35 is provided on the top of the support plate 34, and the magnetic isolation layer 35 is located in the detection area of ​​the outer surface of the cylindrical workpiece 2.

[0057] The support plate 34 is made of a magnetic material that can magnetically adsorb the cylindrical workpiece 2, which not only facilitates the support of the cylindrical workpiece 2 during the conveying process, but also ensures the stability of the cylindrical workpiece 2 during horizontal conveying through the magnetic adsorption force, and prevents the cylindrical workpiece 2 from tilting due to external vibration and other factors during horizontal conveying, thereby affecting the accuracy of defect detection;

[0058] A magnetic isolation layer 35 is provided on the top of the support plate 34, and the magnetic isolation layer 35 is located in the outer surface detection area of ​​the cylindrical workpiece 2, which is used to reduce the magnetic adsorption force of the cylindrical workpiece 2 in the outer surface detection area, thereby facilitating better rotation of the cylindrical workpiece 2 in this area and improving the effect of subsequent defect detection. It should be noted here that the cylindrical workpiece 2 is a metal workpiece.

[0059] See attached Figure 5 , Fig. 9 and Fig.10 The inside of the frame 1 is slidably connected with a U-shaped rod 54 through two sliding frames, and the top of the U-shaped rod 54 is rotatably connected with a directional roller 55 for intercepting the cylindrical workpiece 2 on the conveyor belt 32, and the frame 1 is provided with a driving member 56 for driving the directional roller 55 up and down;

[0060] The directional roller 55 is connected and rotated between the U-shaped rods 54. The directional roller 55 can intercept the cylindrical workpiece 2 transported on the conveyor belt 32. With the continuous transport of the conveyor belt 32, the cylindrical workpiece 2 on the conveyor belt 32 can rotate. With the second visual detector 53, the outer surface of the cylindrical workpiece 2 can be visually inspected.

[0061] The driving member 56 is provided to drive the directional roller 55 to move up and down. The up and down movement of the directional roller 55 is not only convenient for intercepting the cylindrical workpiece 2, but also convenient for releasing the cylindrical workpiece 2 after passing the inspection, thereby forming a continuous conveying operation. The driving member 56 includes but is not limited to an electric telescopic rod for driving the directional roller 55 up and down.

[0062] See attached Figure 5 , Figure 7 and Figure 8 The reject assembly 6 includes a U-shaped mounting frame 61 fixed to one side of the top of the U-shaped frame 51, one end of the U-shaped mounting frame 61 is slidably connected to a lifting member 63 for lifting the cylindrical workpiece 2, and a reject export frame 62 is fixedly connected to the top of the frame frame 1;

[0063] The lifting member 63 is provided to lift the unqualified cylindrical workpiece 2, and after lifting, the unqualified cylindrical workpiece 2 is automatically discharged into the rejecting and exporting frame 62, and automatically rejected by the rejecting and exporting frame 62;

[0064] It should be noted here that when unqualified products are detected, the conveying component 3 stops operating and will not operate until the unqualified products are rejected and the rejecting component 6 is reset.

[0065] See attached Figure 7 and Figure 8The lifting member 63 includes a U-shaped bracket 631 slidably connected to one end of the U-shaped mounting frame 61, arc-shaped supporting plates 632 are provided at both ends of the bottom of the U-shaped bracket 631, and an inclined electric cylinder 633 is hinged between the top of the U-shaped mounting frame 61 and the top of the U-shaped bracket 631;

[0066] The electric cylinder 633 is connected to an external power supply and a control switch, and is used to drive the U-shaped bracket 631 to move up and down. The up and down movement of the U-shaped bracket 631 can drive the two arc-shaped support plates 632 to move up and down. The upward movement of the two arc-shaped support plates 632 can lift up the unqualified cylindrical workpiece 2 to perform subsequent removal work.

[0067] Refer to the attached Figure 7 and Figure 8 , the two arc-shaped support plates 632 are rotatably connected to the bottom of the U-shaped bracket 631 by a rotating shaft 634, and the rotating ends of the two arc-shaped support plates 632 are installed with torsion springs 635;

[0068] The torsion spring 635 is used to position the arc-shaped support plate 632, so as to ensure that the arc-shaped support plate 632 is always in a vertical state without any driving force, thereby ensuring that the arc-shaped support plate 632 supports the cylindrical workpiece 2;

[0069] One end of the two rotating shafts 634 is fixedly connected with an inclined toggle block 636, and both sides of the rejection and lead-out frame 62 are fixedly connected with an L-shaped limit rod 637;

[0070] By installing L-shaped limit rods 637 on both sides of the rejection and export frame 62, the toggle block 636 that moves upward a certain distance can be limited, so that when the U-shaped bracket 631 continues to move upward, its L-shaped limit rod 637 can flip and drive the toggle block 636, and then the arc-shaped support plate 632 can be driven to rotate through the rotating shaft 634, so as to facilitate the cylindrical workpiece 2 located inside the two arc-shaped support plates 632 to roll into the rejection and export frame 62, and the defective cylindrical workpiece 2 is exported through the rejection and export frame 62, thereby forming a defective product rejection work, and has a good automatic rejection function.

[0071] Embodiment 2: Based on embodiment 1, the difference is that;

[0072] See attached Fig. 9 and Fig.10 The driving member 56 includes a U-shaped frame 561 fixed to the bottom of the frame 1, and the bottom of the U-shaped frame 561 is rotatably connected to a transmission shaft 562, and the transmission shaft 562 is connected to one of the transmission rollers 31 through two belt groups 563;

[0073] The transmission shaft 562 uses two belt groups 563 to rotate with one of the transmission rollers 31, so that when the transmission roller 31 drives the conveyor belt 32 to rotate, the transmission shaft 562 in the driving member 56 can be synchronously driven to rotate, so that the subsequent driving member 56 can lift and reciprocate the directional roller 55, which has a good transmission function, so that when the cylindrical workpiece 2 is transported by the conveyor belt 32, the cylindrical workpiece 2 can be intercepted by the directional roller 55 to make the cylindrical workpiece 2 rotate in a directional manner, so as to facilitate the detection of defects on the outer surface of the cylindrical workpiece 2 by the second visual detector 53. The cylindrical workpiece 2 can be intercepted by the lifting of the directional roller 55, so as to form a continuous conveying work of the cylindrical workpiece 2, thereby improving the consistency of the defect detection of the cylindrical workpiece 2 and the work efficiency of the defect detection;

[0074] The belt set 563 adopts a belt mechanism in the prior art, which is composed of a belt and two pulleys with equal or unequal diameters, and is used to transmit the rotational driving force of one of the transmission rollers 31 to the transmission shaft 562, so that the transmission shaft 562 rotates synchronously;

[0075] An eccentric wheel 564 is fixedly connected to the outer surface of the transmission shaft 562, a movable frame 565 is slidably connected to the bottom of the U-shaped frame 561, and two inclined connecting frames 566 are hinged between the bottom of the movable frame 565 and the bottom end of the U-shaped rod 54, and a spring 567 for elastically squeezing the movable frame 565 is fixedly connected to the bottom of the U-shaped frame 561 through a bracket;

[0076] The rotation of the transmission shaft 562 can synchronously drive the eccentric wheel 564 to rotate, and when the eccentric wheel 564 rotates at a certain angle, it can squeeze the movable frame 565, so that the movable frame 565 moves to the left, and the movement of the left side of the movable frame 565 can drive the two inclined connecting frames 566 to move in a fan shape, and then drive the U-shaped rod 54 to move upward, so that the directional roller 55 rises vertically, loses the interception of the cylindrical workpiece 2, and then facilitates the continuous transportation of qualified workpieces to the qualified storage area;

[0077] The elastic force of the spring 567 can squeeze the movable frame 565 after the left movement, thereby facilitating the reset of the right side of the movable frame 565, and indirectly causing the directional roller 55 to move vertically downward, thereby forming the next round of positioning and interception of the cylindrical workpiece 2;

[0078] It should be noted here that the distances between several cylindrical workpieces 2 transported on the conveyor belt 32 are equal, and the distance between two adjacent cylindrical workpieces 2 is greater than the outer surface detection of the cylindrical workpiece 2 can be completed. That is to say, when the cylindrical workpiece 2 moves to the position of the oriented roller 55 for outer surface detection, when the outer surface of the cylindrical workpiece 2 is completely detected and the cylindrical workpiece 2 is continuously transported, the adjacent cylindrical workpiece 2 moves to the position of the oriented roller 55 for the next round of detection. The specific distance and size can be set according to actual conditions.

[0079] Embodiment 3: Based on embodiment 1, the difference is that;

[0080] See attached Fig.11 The feeding assembly 4 includes a cylindrical barrel 41 mounted on the top of the frame 1 through a bracket, and the top of the cylindrical barrel 41 is fixedly connected to a material collecting bin 42, and the bottom of the cylindrical barrel 41 is fixedly connected to a material guide frame 43, and a positioning plate 44 is hinged on one side of the bottom of the material guide frame 43;

[0081] The material collecting bin 42 is provided to store the cylindrical workpieces 2 that need defect detection. The cylindrical workpieces 2 are moved to the top of the conveyor belt 32 through the cylindrical tube 41 and the material guide frame 43, and the cylindrical workpieces 2 are conveyed by the conveyor belt 32. The material guide frame 43 and the positioning plate 44 are provided to position the loaded cylindrical workpieces 2 to ensure that the cylindrical workpieces 2 fall onto the conveyor belt 32 and appear tilted, thereby affecting the subsequent visual detection. The positioning plate 44 is installed in a hinged manner to facilitate the removal of the positioned cylindrical workpiece 2 from the inside of the material guide frame 43, thereby forming the detection and conveying work.

[0082] The interior of the cylindrical barrel 41 is rotatably connected to a rotating shaft 45, and the outer surface of the rotating shaft 45 is fixedly connected to a cylindrical block 46, and the outer surface of the cylindrical block 46 is provided with a plurality of notches having a diameter equal to that of the cylindrical workpiece 2;

[0083] The rotation of the rotating shaft 45 can drive the cylindrical block 46 to rotate, and the rotation of the cylindrical block 46 can drive the positions of the plurality of recesses to be changed. The change of the positions of the plurality of recesses not only facilitates the cylindrical workpiece 2 inside the recess to move, and waits for the cylindrical workpiece 2 to move to the position of the material guide frame 43 for loading, but also facilitates the cylindrical workpiece 2 inside the collecting bin 42 to enter the interior of the recess, so as to form a subsequent sequential loading work.

[0084] A speed reducer 7 is installed on the frame 1, and one end of a driving roller 31 is drivingly connected to one end of a rotating shaft 45 through the speed reducer 7;

[0085] The reduction member 7 includes a reduction box and a transmission member, such as gears and belts, for connecting the rotating shaft 45 with the output end of the reduction box, and is used to transmit the rotational driving force of the transmission roller 31 to the rotating shaft 45, so that the rotating shaft 45 rotates synchronously. The reduction box is set to adjust the rotation speed, thereby facilitating the intermittent feeding of the rotating shaft 45 to prevent the problem of too fast or too slow feeding.

[0086] It should be noted that the term "comprises" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article, or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0087] 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 workpiece defect detection device based on machine vision, comprising a frame (1), characterized in that: A conveying assembly (3) for conveying a cylindrical workpiece (2) is arranged inside the frame (1), a loading assembly (4) is arranged on one side of the top of the frame (1), a visual inspection mechanism (5) is arranged on the top of the frame (1), and a rejection assembly (6) is arranged above the frame (1); The conveying assembly (3) comprises two transmission rollers (31) rotatably connected to the inside of the frame (1) and a conveying belt (32) connected by transmission via the two transmission rollers (31); a motor (33) for rotationally driving one of the transmission rollers (31) is provided on the back of the frame (1); The visual inspection mechanism (5) comprises a U-shaped frame (51) fixed on a frame frame (1), both sides of the U-shaped frame (51) being fixedly connected with first visual detectors (52) for visually inspecting the two ends of a cylindrical workpiece (2), and the top of the U-shaped frame (51) being fixedly connected with a second visual detector (53) for visually inspecting the outer surface of the cylindrical workpiece (2) via a bracket.

2. The workpiece defect detection device based on machine vision according to claim 1, characterized in that: A support plate (34) for supporting the upper surface of the conveyor belt (32) is fixedly connected to the interior of the frame (1); The support plate (34) is made of a magnetic material capable of magnetically adsorbing the columnar workpiece (2); a magnetic isolation layer (35) is provided on the top of the support plate (34), and the magnetic isolation layer (35) is located in a detection area on the outer surface of the columnar workpiece (2).

3. The workpiece defect detection device based on machine vision according to claim 1, characterized in that: The interior of the frame (1) is slidably connected to a U-shaped rod (54) via two sliding frames, the top end of the U-shaped rod (54) is rotatably connected to a directional roller (55) for intercepting a cylindrical workpiece (2) on a conveyor belt (32), and the frame (1) is provided with a driving member (56) for driving the directional roller (55) up and down.

4. The workpiece defect detection device based on machine vision according to claim 1, characterized in that: The reject assembly (6) comprises a U-shaped mounting frame (61) fixed to one side of the top of the U-shaped frame (51), one end of the U-shaped mounting frame (61) is slidably connected to a lifting member (63) for lifting the columnar workpiece (2), and the top of the frame frame (1) is fixedly connected to a reject lead-out frame (62).

5. The device for detecting workpiece defects based on machine vision according to claim 4, characterized in that: The lifting member (63) includes a U-shaped bracket (631) slidably connected to one end of the U-shaped mounting frame (61), arc-shaped supporting plates (632) are provided at both ends of the bottom of the U-shaped bracket (631), and an inclined electric cylinder (633) is hinged between the top of the U-shaped mounting frame (61) and the top of the U-shaped bracket (631).

6. The workpiece defect detection device based on machine vision according to claim 5, characterized in that: The two arc-shaped supporting plates (632) are both rotatably connected to the bottom of the U-shaped bracket (631) by a rotating shaft (634), and the rotating ends of the two arc-shaped supporting plates (632) are both installed with torsion springs (635); One end of each of the two rotating shafts (634) is fixedly connected to an inclined toggle block (636), and both sides of the rejection and lead-out frame (62) are fixedly connected to an L-shaped limiting rod (637).

7. The workpiece defect detection device based on machine vision according to claim 1, characterized in that: The loading assembly (4) comprises a cylindrical cylinder (41) mounted on the top of the frame (1) via a bracket, and the top of the cylindrical cylinder (41) is fixedly connected to a material collecting bin (42), the bottom of the cylindrical cylinder (41) is fixedly connected to a material guide frame (43), and a positioning plate (44) is hinged on one side of the bottom of the material guide frame (43).

8. The device for detecting workpiece defects based on machine vision according to claim 7, characterized in that: The cylindrical barrel (41) is rotatably connected to a rotating shaft (45) inside, and a cylindrical block (46) is fixedly connected to the outer surface of the rotating shaft (45), and the outer surface of the cylindrical block (46) is provided with a plurality of notches having a diameter equal to that of the cylindrical workpiece (2); A speed reducer (7) is installed on the frame (1), and one end of a driving roller (31) is drivingly connected to one end of a rotating shaft (45) via the speed reducer (7).

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