Visual inspection device and method for processing defects of special-shaped sealing ring

Abstract

The invention discloses a visual inspection device and method for machining defects of a special-shaped sealing ring, and relates to the technical field of sealing ring detection.The visual inspection device comprises a visual inspection machine body, a visual inspection camera is installed on the visual inspection machine body, and a fixed panel is installed on the upper side of the visual inspection machine body; a special-shaped sealing ring is arranged on the fixed panel, and two groups of stretching stop blocks and two groups of positioning columns are movably arranged on the fixed panel; and the stretching mechanism comprises a fixed square block, a first sliding block, a mounting groove and a cross groove, the mounting groove is formed in the fixed panel, the cross groove is formed in the upper side of the fixed panel, and the fixed square block is fixedly mounted in the center of the fixed panel. According to the invention, the surface which is originally in a bent state is changed into an approximately flat state in a manner of rotating and stretching the special-shaped sealing ring, so that the crack which is originally in a closed state is changed into an unfolded state.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealing ring detection, in particular to a visual detection device and method for processing defects of special-shaped sealing rings. BACKGROUND

[0002] For visual detection of processing defects of large special-shaped sealing rings, the background technology can focus on the detection difficulty of hidden defects of large-size workpieces after manufacturing. Due to the large size and complex curved surface structure of such sealing rings, micro cracks, internal layering or poor adhesion may occur in the stress concentration areas such as the inner curved surface and the root corner of the sealing rings during vulcanization, trimming or post-processing due to uneven internal stress, mold wear or process fluctuations. These defects are often closed or shaded by the structure in the initial state, and are extremely difficult to be found in conventional static visual detection, which constitutes a serious product quality and safety hazard.

[0003] The existing automatic visual detection scheme mainly adopts multi-camera surround static shooting or cooperates with slow rotation scanning of the workpiece for large-size special-shaped parts. However, these methods mainly capture the surface topography of the workpiece in the free state, and are almost powerless for micro cracks in the closed or stressed state and weakly bonded areas inside the material. Even if high-resolution cameras and complex light sources are used, the detection rate is low and the false positive rate is high due to weak defect signals and strong background interference. Some methods try to introduce contact probes or air-tightness detection, which can find some problems, but are low in efficiency, have the risk of damaging the workpiece, and cannot accurately locate and visualize the defects. SUMMARY

[0004] The purpose of the present application is to provide a visual detection device and method for processing defects of special-shaped sealing rings to solve the problem of visual detection of special-shaped rubber rings in the background technology that the cracks in the closed state cannot be detected.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a visual detection device and method for processing defects of special-shaped sealing rings, comprising a visual detection machine body, a visual detection camera is installed on the visual detection machine body, a fixed panel is installed on the upper side of the visual detection machine body, a special-shaped sealing ring is arranged on the fixed panel, and two groups of stretching blocks and two groups of positioning columns are movably arranged on the fixed panel; A stretching mechanism is provided, which comprises a fixed block, a first sliding block, a mounting groove and a cross groove, the mounting groove is formed in the fixed panel, the cross groove is formed on the upper side of the fixed panel, the fixed block is fixedly installed at the center position of the fixed panel, the first sliding block is movably arranged on the left and right sides of the fixed block, and the stretching block is movably installed on the first sliding block. The positioning and rotating mechanism includes a second slider. The second slider is movably arranged on the front and rear sides of the mounting groove. The positioning post is arranged on the second slider. The lower side of the positioning post is flush with the upper side of the cross groove. The upper end of the second slider is inserted into the cross groove.

[0006] Preferably, the tensioning mechanism further includes a first screw, a first threaded sleeve, and a mounting slider. A dual-head motor is provided inside the fixed block, and the first screw is fixedly installed on the output shaft of the motor. The first screw is rotatably installed between the inner wall of the fixed block and the mounting groove. The first threaded sleeve is fixedly installed on the first slider. The first threaded sleeve is threaded onto the first screw. A mounting slider is fixedly installed on the upper side of the first slider. The mounting slider slides in the cross groove.

[0007] Preferably, the stretching mechanism further includes a movable mounting plate and a first rotary motor. The movable mounting plate is provided on the mounting slider, and the first rotary motor is fixedly mounted on the movable mounting plate. A stretching stop is mounted on the output shaft of the first rotary motor, and the stretching stop is teardrop-shaped.

[0008] Preferably, the stretching mechanism further includes a guide groove, a guide block, a fixed side plate, a second threaded sleeve, and a second screw. A fixed side plate is fixedly installed at one end of the movable mounting plate, and a second threaded sleeve is fixedly installed at the center of the fixed side plate. A second screw is rotatably installed on the mounting slider, and the second threaded sleeve is threaded onto the second screw. A guide groove is provided on the lower side of the movable mounting plate, and a guide block is fixedly installed on the upper side of the mounting slider. The guide block is inserted into the guide groove.

[0009] Preferably, the tensioning mechanism further includes a movable rod, a cross-shaped limiting groove, and a pressure sensor. The movable rod is fixedly installed on the tensioning block, and the movable rod has a cross-shaped limiting groove. A cross-shaped limiting rod is fixedly installed on the output shaft of the first rotary motor, and the cross-shaped limiting rod is inserted into the cross-shaped limiting groove. A pressure sensor is fixedly installed on the movable mounting plate, and one side of the movable rod abuts against the pressure sensor.

[0010] Preferably, the positioning and rotating mechanism further includes hinge rods, guide holes, and guide rods. Two sets of hinge rods are rotatably mounted on both sides of the first slider. The two sets of hinge rods, which are different but located on the same side, are rotatably mounted on the same set of second sliders. The second slider has guide holes. Guide rods are fixedly mounted on the front and rear sides of the fixed block, and the guide rods are inserted into the guide holes.

[0011] Preferably, the positioning and rotating mechanism further includes a second rotary motor and a damping rubber ring. The second rotary motor is fixedly mounted on the second slider, a positioning post is fixedly mounted on the output shaft of the second rotary motor, and a damping rubber ring is fixedly mounted on the positioning post. The damping rubber ring abuts against the inner side of the irregular sealing ring.

[0012] Preferably, a ring light is fixedly installed on the fixed block, and four sets of backlights are fixedly installed on the upper side of the fixed panel.

[0013] Preferably, the fixed panel array is fixedly installed with an indicator strip, which is disposed on both sides of the cross groove, and the indicator strip is provided with scale and color.

[0014] Preferably, in S1: the spacing between the positioning posts is less than the inner diameter of the irregular sealing ring, the tension block is located outside the irregular sealing ring, the irregular sealing ring is placed on the fixed panel, and preliminary visual inspection is performed by the visual inspection camera; S2: The positioning post is positioned relative to the inner side of the irregular sealing ring. At this time, the tension block does not contact the irregular sealing ring, and moves with the positioning post to the inner side of the irregular sealing ring. Then the tension block rotates to contact the inner side of the irregular sealing ring. S3: The positioning posts are relatively close to each other, and the tensioning blocks are relatively far apart, so that the inner side of the irregular sealing ring is gradually straightened, and the visual inspection camera re-inspects the deformed irregular sealing ring. S4: The positioning post moves away from the inner side of the irregular sealing ring, the tension block rotates to no longer contact the inner side of the irregular sealing ring, the positioning post rotates to make the irregular sealing ring rotate, and after rotating to a certain angle, S2 and S3 are executed again. S5: After multiple rotation tests are completed, return to the position of S1, and then manually remove the irregular sealing ring.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention transforms the originally curved surface into a nearly flat state by rotating and stretching the irregular sealing ring, thereby turning the originally closed crack into an open state, making it easier to expose the defects on the inner side of the irregular sealing ring, increasing the completeness of the equipment when inspecting the defects of the irregular sealing ring. In addition, the equipment can also drive the positioning column of the irregular sealing ring to rotate, so that the stretched part of the irregular sealing ring can be adjusted, increasing the comprehensiveness of the equipment when in use. 2. By adjusting the process coordination and the position of the stretching block, this invention can adapt to irregularly shaped sealing rings of different thicknesses and diameters, increasing the applicability of the equipment. Furthermore, the equipment has backlighting, top light, and side light illumination, which allows for sufficient settings when the irregularly shaped sealing rings are subjected to stretching inspection, reducing the adverse effects of shadows on visual inspection. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention; Figure 2 This is a structural schematic diagram of the fixed panel provided in an embodiment of the present invention; Figure 3 This is a bottom view of the structural cross-section at the fixed panel provided in an embodiment of the present invention; Figure 4 This is a schematic cross-sectional view of the irregularly shaped sealing ring provided in an embodiment of the present invention; Figure 5 This is a top view of the structural cross-section at the fixed panel provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure at the hinge rod provided in an embodiment of the present invention; Figure 7 This is a schematic cross-sectional view of the structure at the second slider provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structural separation at the first slider provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structural separation at the tension stop provided in an embodiment of the present invention; Figure 10 Provided for embodiments of the present invention Figure 5 A magnified view of part A in the diagram.

[0017] In the diagram: 1. Visual inspection machine body; 2. Visual inspection camera; 3. Fixed panel; 4. Irregularly shaped sealing ring; 5. Tensioning block; 6. Positioning post; 7. Tensioning mechanism; 701. Fixed block; 702. First screw; 703. First slider; 704. First threaded sleeve; 705. Mounting groove; 706. Cross groove; 707. Mounting slider; 708. Movable mounting plate; 709. First rotary motor; 710. Guide groove; 711. 712. Guide block; 713. Fixed side plate; 714. Second screw sleeve; 715. Second screw rod; 716. Cross limit rod; 717. Movable rod; 718. Cross limit groove; 719. Pressure sensor; 800. Positioning rotation mechanism; 801. Hinge rod; 802. Second slider; 803. Guide hole; 804. Guide rod; 805. Second rotary motor; 806. Damping rubber ring; 9. Ring light; 10. Backlight; 11. Marking strip. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-10 The present invention provides a technical solution: a visual inspection device and method for processing defects of irregular sealing rings, including a visual inspection machine body 1, a visual inspection camera 2 installed on the visual inspection machine body 1, a fixed panel 3 installed on the upper side of the visual inspection machine body 1, an irregular sealing ring 4 provided on the fixed panel 3, and two sets of tension blocks 5 and two sets of positioning columns 6 movably arranged on the fixed panel 3. The tensioning mechanism 7 includes a fixed block 701, a first slider 703, a mounting groove 705, and a cross groove 706. The mounting groove 705 is provided in the fixed panel 3, and the cross groove 706 is provided on the upper side of the fixed panel 3. The fixed block 701 is fixedly installed at the center of the fixed panel 3. The first slider 703 is movably arranged on the left and right sides of the fixed block 701. The tensioning block 5 is movably installed on the first slider 703. The positioning and rotating mechanism 8 includes a second slider 802, which is movably mounted on both the front and rear sides within the mounting groove 705. A positioning post 6 is mounted on the second slider 802, with its lower side flush with the upper side of the cross groove 706. The upper end of the second slider 802 is inserted into the cross groove 706. This equipment flattens the inner side of the irregularly shaped sealing ring 4 by pulling it, thus making any cracks on the inner side of the irregularly shaped sealing ring 4 more clearly visible, thereby improving the visual inspection effect. The equipment can also rotate the irregularly shaped sealing ring 4, allowing for comprehensive inspection of the irregularly shaped sealing ring 4 by pulling it at different positions. In addition, the pulling force can be detected during the pulling process, thereby judging the quality of the irregularly shaped sealing ring 4 based on the pulling force, increasing the functionality of the equipment during use.

[0020] Furthermore, the tensioning mechanism 7 also includes a first screw 702, a first threaded sleeve 704, and a mounting slider 707. A double-headed motor is provided inside the fixed block 701, and the first screw 702 is fixedly mounted on the output shaft of the motor. The first screw 702 is rotatably mounted between the inner wall of the fixed block 701 and the mounting groove 705. The first threaded sleeve 704 is fixedly mounted on the first slider 703. The first threaded sleeve 704 is threaded onto the first screw 702. The mounting slider 707 is fixedly mounted on the upper side of the first slider 703 and slides in the cross groove 706. This structure is the movable structure of the tension stop 5 and the movable structure of the positioning post 6. Through synchronous movement, it can achieve uniform stretching on both sides of the irregular sealing ring 4. The cross groove 706 opened on the fixed panel 3 has a range larger than the maximum diameter of the irregular sealing ring 4. The auxiliary structure of the tension stop 5 moves on the outside of the irregular sealing ring 4 to hook the inner side of the irregular sealing ring 4 for stretching. The auxiliary structure of the positioning post 6 moves on the inside of the irregular sealing ring 4 to abut against the inner side of the irregular sealing ring 4 for positioning. Furthermore, the stretching mechanism 7 also includes a movable mounting plate 708 and a first rotary motor 709. The movable mounting plate 708 is provided on the mounting slider 707, and the first rotary motor 709 is fixedly mounted on the movable mounting plate 708. A stretching stop 5 is mounted on the output shaft of the first rotary motor 709. The stretching stop 5 is teardrop-shaped. This structure is a hooking structure on the outer side of the irregular sealing ring 4. By rotating the stretching stop 5, the hooking state of the irregular sealing ring 4 can be switched. The state in which the stretching stop 5 can hook the inner side of the irregular sealing ring 4 is the stretched state, and the state in which the stretching stop 5 cannot hook the inner side of the irregular sealing ring 4 is the relaxed state. The stretching stop 5 can be rotated to adjust the distance between the lower end of the stretching stop 5 and the upper side of the fixed panel 3, thereby completing the adaptation adjustment for irregular sealing rings 4 of different thicknesses. In subsequent processes, the stretching stop 5 can also be rotated to not contact the irregular sealing ring 4, thereby cooperating with the positioning post 6 to complete the corresponding process. Furthermore, the tensioning mechanism 7 also includes a guide groove 710, a guide block 711, a fixed side plate 712, a second threaded sleeve 713, and a second screw 714. A fixed side plate 712 is fixedly mounted on one end of the movable mounting plate 708, and a second threaded sleeve 713 is fixedly mounted at the center of the fixed side plate 712. The second screw 714 is rotatably mounted on the mounting slider 707, and the second threaded sleeve 713 is threaded onto the second screw 714. A guide groove 710 is provided on the lower side of the movable mounting plate 708, and a guide block 711 is fixedly mounted on the upper side of the mounting slider 707, with the guide block 711 inserted into the guide groove 710. This structure is an adjustment structure for the position of the tensioning stop 5, allowing the tensioning stop 5 to adapt to irregularly shaped sealing rings 4 of different diameters. Combined with the tensioning stop 5, it can adapt to irregularly shaped sealing rings 4 of different thicknesses, thus giving the equipment good adaptability to irregularly shaped sealing rings 4 of different specifications. Furthermore, the tensioning mechanism 7 also includes a movable rod 716, a cross-shaped limiting groove 717, and a pressure sensor 718. The movable rod 716 is fixedly mounted on the tensioning block 5, and the cross-shaped limiting groove 717 is formed on the movable rod 716. A cross-shaped limiting rod 715 is fixedly mounted on the output shaft of the first rotary motor 709, and the cross-shaped limiting rod 715 is inserted into the cross-shaped limiting groove 717. A pressure sensor 718 is fixedly mounted on the movable mounting plate 708, and one side of the movable rod 716 abuts against the pressure sensor 718. This structure is for measuring the tensioning force of the tensioning block 5. The pressure sensor 718 can measure the force borne by the tensioning block 5 when stretching the irregularly shaped sealing ring 4. In this way, it can be determined whether the material distribution of the irregularly shaped sealing ring 4 is uniform and whether there are any deformed parts, increasing the functionality of the equipment. Combined with visual inspection, the quality of the irregularly shaped sealing ring 4 can be judged more comprehensively. Furthermore, the positioning and rotating mechanism 8 also includes hinge rods 801, guide holes 803, and guide rods 804. Two sets of hinge rods 801 are rotatably mounted on both sides of the first slider 703. The two sets of hinge rods 801, which are different sets but located on the same side, are rotatably mounted on the same set of second sliders 802. The second slider 802 has guide holes 803. Guide rods 804 are fixedly mounted on the front and rear sides of the fixed block 701, and the guide rods 804 are inserted into the guide holes 803. This structure is the positioning structure for the irregular sealing ring 4. By setting the maximum spacing of the positioning pins 6 to the inner diameter of the irregular sealing ring 4, the positioning of the irregular sealing ring 4 is completed, so that the irregular sealing ring 4 is in the center position on the fixed panel 3. This not only allows the visual inspection camera 2 to better capture the irregular sealing ring 4, but also provides good positional conditions for subsequent stretching. At the same time, the second slider 802 and the first screw 702 move synchronously, providing conditions for subsequent process coordination. Furthermore, the positioning rotation mechanism 8 also includes a second rotary motor 805 and a damping rubber ring 806. The second rotary motor 805 is fixedly mounted on the second slider 802, and a positioning post 6 is fixedly mounted on the output shaft of the second rotary motor 805. The damping rubber ring 806 is fixedly mounted on the positioning post 6, and the damping rubber ring 806 abuts against the inner side of the irregular sealing ring 4. This structure allows rotation when the damping rubber ring 806 abuts against the inner side of the irregular sealing ring 4, thereby realizing the switching of the stretching position of the irregular sealing ring 4, and also has the ability to correct the position of the irregular sealing ring 4. Furthermore, a ring light 9 is fixedly installed on the fixed block 701, and four sets of backlights 10 are fixedly installed on the upper side of the fixed panel 3. This structure is an illumination structure. Through backlighting, side lighting, and the top light built into the visual inspection camera 2, shadowless illumination of the visual inspection camera 2 can be achieved, increasing the clarity of the irregular sealing ring 4 during inspection. Furthermore, the fixed panel 3 is fixedly mounted with marking strips 11, which are located on both sides of the cross groove 706. The marking strips 11 are marked with scales and colors. This structure serves as a visual positioning structure for the worker's view of the irregular sealing ring 4. It can help the worker place the irregular sealing ring 4 in the center of the fixed panel 3, effectively reducing deviation. It also provides a visual reference when adjusting the position of the tension stop 5, increasing the convenience of using the equipment. Furthermore, S1: The spacing between the positioning posts 6 is less than the inner diameter of the irregular sealing ring 4, the tension block 5 is located outside the irregular sealing ring 4, the irregular sealing ring 4 is placed on the fixed panel 3, and a preliminary visual inspection is performed by the visual inspection camera 2. S2: The positioning post 6 is positioned relatively away from the inner side of the irregular sealing ring 4. At this time, the tension block 5 does not contact the irregular sealing ring 4, and moves with the positioning post 6 to the inner side of the irregular sealing ring 4. Then the tension block 5 is rotated to contact the inner side of the irregular sealing ring 4. S3: The positioning pins 6 are relatively close and the tensioning blocks 5 are relatively far apart, so that the inner side of the irregular sealing ring 4 is gradually straightened, and the visual inspection camera 2 re-inspects the deformed irregular sealing ring 4. S4: The positioning pin 6 moves away from the inner side of the irregular sealing ring 4, the tension block 5 rotates to no longer contact the inner side of the irregular sealing ring 4, the positioning pin 6 rotates to make the irregular sealing ring 4 rotate, after rotating to a certain angle, continue to execute S2 and S3. S5: After multiple rotation tests are completed, reset to position S1, and manually remove the irregular sealing ring 4.

[0021] Working principle: When using this invention, the position of the stretching block 5 is adjusted according to the size of the irregular sealing ring 4. The adjustment method is to rotate the second screw 714, which drives the movable mounting plate 708 to move relative to the mounting slider 707 through the thread action between it and the second screw sleeve 713, thereby achieving the purpose of adjusting the position of the stretching block 5. The double-headed motor in the fixed block 701 is started, which drives the first screw 702 to rotate. Through the thread action between it and the first screw sleeve 704, the first slider 703 is moved away from each other, thereby making the two sets of positioning posts 6 relatively close, so that the maximum distance between the positioning posts 6 is less than the inner diameter of the irregular sealing ring 4. The irregular sealing ring 4 is placed on the fixed panel 3, and the position of the irregular sealing ring 4 is manually calibrated by the marking strip 11. Then, the irregular sealing ring 4 is initially visually inspected by the visual inspection camera 2.

[0022] Then, the dual-head motor is started, driving the first slider 703 to move closer together until the outer side of the positioning post 6 abuts against the inner side of the irregular sealing ring 4, completing the positioning of the irregular sealing ring 4. The first rotary motor 709 is started, driving the tension block 5 to rotate to the tension state. At this time, the tension block 5 is inside the irregular sealing ring 4. The dual-head motor works again, and the tension block 5 hooks onto the inner side of the irregular sealing ring 4, gradually stretching the irregular sealing ring 4 to a flat state. At this time, the positioning post 6 moves closer together, and the pressure sensor 718 detects the tension force. After stretching to the desired position, the irregular sealing ring 4 is detected by the visual inspection camera 2. After the detection is completed, it is reset.

[0023] After resetting, the tension block 5 is rotated to the relaxed state, and the positioning pin 6 is now pressed against the inner side of the irregular sealing ring 4. The second rotary motor 805 is started to drive the positioning pin 6 to rotate. The two sets of positioning pins 6 rotate simultaneously, driving the irregular sealing ring 4 to rotate. After rotating to a certain angle, the above steps can be repeated.

[0024] After the test is completed, rotate the tension block 5 to the relaxed state, then move the tension block 5 away from each other and the positioning pin 6 towards each other. Then, manually flip or replace the irregular sealing ring 4.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A visual inspection device for machining defects of irregularly shaped sealing rings, comprising a visual inspection machine body (1), wherein a visual inspection camera (2) is mounted on the visual inspection machine body (1), characterized in that: A fixed panel (3) is installed on the upper side of the body (1) of the visual inspection machine. A special-shaped sealing ring (4) is provided on the fixed panel (3). Two sets of tension blocks (5) and two sets of positioning columns (6) are movably arranged on the fixed panel (3). The tensioning mechanism (7) includes a fixed block (701), a first slider (703), a mounting groove (705), and a cross groove (706). The mounting groove (705) is provided in the fixed panel (3), and the cross groove (706) is provided on the upper side of the fixed panel (3). The fixed block (701) is fixedly installed at the center of the fixed panel (3). The first slider (703) is movably arranged on the left and right sides of the fixed block (701). The tensioning block (5) is movably installed on the first slider (703). The positioning and rotating mechanism (8) includes a second slider (802). The second slider (802) is movably arranged on the front and rear sides of the mounting groove (705). The positioning post (6) is arranged on the second slider (802). The lower side of the positioning post (6) is flush with the upper side of the cross groove (706). The upper end of the second slider (802) is inserted into the cross groove (706).

2. The visual inspection device for machining defects of irregularly shaped sealing rings according to claim 1, characterized in that: The tensioning mechanism (7) further includes a first screw (702), a first threaded sleeve (704), and a mounting slider (707). A double-headed motor is provided in the fixed block (701), and the first screw (702) is fixedly installed on the output shaft of the motor. The first screw (702) is rotatably installed between the inner wall of the fixed block (701) and the mounting groove (705). The first threaded sleeve (704) is fixedly installed on the first slider (703). The first threaded sleeve (704) is threaded onto the first screw (702). The mounting slider (707) is fixedly installed on the upper side of the first slider (703). The mounting slider (707) slides in the cross groove (706).

3. The visual inspection device for machining defects of irregularly shaped sealing rings according to claim 2, characterized in that: The stretching mechanism (7) further includes a movable mounting plate (708) and a first rotary motor (709). The movable mounting plate (708) is provided on the mounting slider (707). The first rotary motor (709) is fixedly mounted on the movable mounting plate (708). A stretching block (5) is installed on the output shaft of the first rotary motor (709). The stretching block (5) is teardrop-shaped.

4. The visual inspection device for machining defects of irregularly shaped sealing rings according to claim 3, characterized in that: The tensioning mechanism (7) further includes a guide groove (710), a guide block (711), a fixed side plate (712), a second threaded sleeve (713), and a second screw (714). A fixed side plate (712) is fixedly installed at one end of the movable mounting plate (708). A second threaded sleeve (713) is fixedly installed at the center of the fixed side plate (712). A second screw (714) is rotatably installed on the mounting slider (707). The second threaded sleeve (713) is threaded onto the second screw (714). A guide groove (710) is provided on the lower side of the movable mounting plate (708). A guide block (711) is fixedly installed on the upper side of the mounting slider (707). The guide block (711) is inserted into the guide groove (710).

5. The visual inspection device for machining defects of irregularly shaped sealing rings according to claim 4, characterized in that: The tensioning mechanism (7) further includes a movable rod (716), a cross-shaped limiting groove (717), and a pressure sensor (718). The movable rod (716) is fixedly installed on the tensioning block (5). The movable rod (716) has a cross-shaped limiting groove (717). A cross-shaped limiting rod (715) is fixedly installed on the output shaft of the first rotary motor (709). The cross-shaped limiting rod (715) is inserted into the cross-shaped limiting groove (717). A pressure sensor (718) is fixedly installed on the movable mounting plate (708). One side of the movable rod (716) abuts against the pressure sensor (718).

6. The visual inspection device for machining defects of irregularly shaped sealing rings according to claim 1, characterized in that: The positioning and rotating mechanism (8) further includes a hinge rod (801), a guide hole (803), and a guide rod (804). Two sets of hinge rods (801) are rotatably installed on both sides of the first slider (703). The two sets of hinge rods (801) on the same side are rotatably installed on the same set of second sliders (802). The second slider (802) is provided with a guide hole (803). The front and rear sides of the fixed block (701) are fixedly installed with guide rods (804), and the guide rods (804) are inserted into the guide holes (803).

7. The visual inspection device for machining defects of irregularly shaped sealing rings according to claim 1, characterized in that: The positioning and rotating mechanism (8) further includes a second rotary motor (805) and a damping rubber ring (806). The second rotary motor (805) is fixedly installed on the second slider (802). A positioning column (6) is fixedly installed on the output shaft of the second rotary motor (805). The damping rubber ring (806) is fixedly installed on the positioning column (6). The damping rubber ring (806) abuts against the inner side of the irregular sealing ring (4).

8. The visual inspection device for machining defects of irregularly shaped sealing rings according to claim 1, characterized in that: A ring light (9) is fixedly installed on the fixed block (701), and four sets of backlights (10) are fixedly installed on the upper side of the fixed panel (3).

9. The visual inspection device for machining defects of irregularly shaped sealing rings according to claim 1, characterized in that: The fixed panel (3) array is fixedly installed with an identification strip (11), which is set on both sides of the cross groove (706) and has scale and color on it.

10. A method for visual inspection of machining defects in irregularly shaped sealing rings, characterized in that, The method for visual inspection of machining defects in irregularly shaped sealing rings is applicable to the visual inspection device for machining defects in irregularly shaped sealing rings as described in any one of claims 1-9, and includes the following steps: S1: The spacing between the positioning posts (6) is less than the inner diameter of the irregular sealing ring (4). The tension block (5) is located outside the irregular sealing ring (4). The irregular sealing ring (4) is placed on the fixed panel (3) and a preliminary visual inspection is performed by the visual inspection camera (2). S2: The positioning post (6) is positioned relatively away from the inner side of the irregular sealing ring (4). At this time, the tension block (5) does not contact the irregular sealing ring (4), and the tension block (5) moves to the inner side of the irregular sealing ring (4) as the positioning post (6) moves. Then the tension block (5) rotates to be able to contact the inner side of the irregular sealing ring (4). S3: The positioning posts (6) are relatively close to each other, and the tensioning blocks (5) are relatively far apart, so that the inner side of the irregular sealing ring (4) is gradually straightened, and the visual inspection camera (2) re-inspects the deformed irregular sealing ring (4). S4: The positioning post (6) moves away from the inner side of the irregular sealing ring (4), the tension block (5) rotates to not contact the inner side of the irregular sealing ring (4), the positioning post (6) rotates to make the irregular sealing ring (4) rotate, and after rotating to a certain angle, S2 and S3 are executed. S5: After multiple rotation tests are completed, reset to the position of S1, and manually remove the irregular sealing ring (4).

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