A flaw detection device based on plastic production and processing

Abstract

This invention discloses a defect detection device based on plastic production and processing, relating to the field of plastic product inspection technology. It includes a main worktable, conveyor belts, an inspection bracket, a transverse guide rail, a lifting mounting base, a vision inspection head, a positioning carrier plate, an inspection mounting plate, an optical path limiting ring, a light-transmitting hole, and a bottom reflector. The main worktable is adjacent to one side of the inspection bracket. Two conveyor belts are symmetrically arranged inside the inspection bracket. The transverse guide rail is fixedly installed at the middle of the top of the inspection bracket, and the lifting mounting base is slidably mounted on the transverse guide rail. By symmetrically arranging two conveyor belts inside the inspection bracket and placing the positioning carrier plate on the conveying path between the two conveyor belts, the plastic part to be inspected can enter an independent positioning inspection position from the conveying state. This differs from the existing method where plastic parts are directly inspected below the camera along with the conveyor belt, improving the positional consistency of the plastic part when entering the inspection area.

Description

Technical Field

[0001] This invention relates to the field of plastic product testing technology, specifically to a defect detection device based on plastic production and processing. Background Technology

[0002] During injection molding, extrusion, cutting, and subsequent transportation, plastic products are prone to surface defects such as scratches, dents, gaps, discoloration, and burrs. Current defect detection methods for plastic parts mostly rely on manual visual inspection or fixed camera photography. Manual inspection is greatly affected by the operator's experience and fatigue, resulting in poor consistency. When using fixed cameras, plastic parts are prone to shifting during transportation, leading to unstable shooting positions.

[0003] Meanwhile, for transparent, semi-transparent, or light-colored plastic parts, conventional inspection devices lack stable bottom reflective and light path limiting structures, making it easy for the inspection light to scatter. The contrast between the edges and defective areas of the plastic parts and the background is insufficient, affecting the accuracy of the visual inspection head in identifying the location of defects. Therefore, it is necessary to design a defect inspection device that can position and support the plastic parts during the transportation process and form a stable vertical inspection light path.

[0004] To address this issue, we propose a defect detection device based on plastic production and processing. Summary of the Invention

[0005] In view of this, and in view of the shortcomings of the prior art, the present invention provides a defect detection device based on plastic production and processing to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a defect detection device based on plastic production and processing, comprising a main workbench, a conveyor belt, a detection bracket, a transverse guide rail, a lifting mounting base, a vision inspection head, a positioning carrier plate, a detection mounting plate, an optical path limiting ring, a light-transmitting hole, and a bottom reflector; The main workbench is adjacent to one side of the inspection bracket. Two conveyor belts are symmetrically arranged inside the inspection bracket. The transverse guide rail is fixedly installed at the middle of the top of the inspection bracket. The lifting mounting seat is slidably mounted on the transverse guide rail. The vision inspection head is fixedly installed on the lower side of the lifting mounting seat. The positioning carrier plate is supported on the conveying path between the two conveyor belts. The inspection mounting plate is located below the positioning carrier plate. The light-transmitting hole is opened through the inspection mounting plate. The optical path limiting ring is fixedly connected to the inspection mounting plate and arranged around the light-transmitting hole. The bottom reflector is located below the inspection mounting plate. The vision inspection head, positioning carrier plate, light-transmitting hole, optical path limiting ring, and bottom reflector are arranged correspondingly along the vertical inspection optical path.

[0007] Preferably, it also includes a push cylinder and a limiting conveying baffle; The pushing cylinder is installed on the detection bracket and located on the side of the conveyor belt. The telescopic end of the pushing cylinder faces the positioning carrier plate between the two conveyor belts. The limiting conveyor baffle extends along the conveying direction of the conveyor belt and is located above the conveyor belt.

[0008] Preferably, the lifting mounting base slides in conjunction with the transverse guide rail, and the detection end of the vision inspection head faces the positioning carrier plate and moves along the transverse guide rail with the lifting mounting base.

[0009] Preferably, the positioning carrier plate carries a miniature drive motor, an adjusting linkage, a vertical support plate, a supporting carrier plate, and a limiting slide groove; The output end of the micro drive motor is connected to the adjusting linkage, the adjusting linkage is rotatably connected to the vertical support plate, the support plate is stacked and connected above the positioning plate, and the limiting groove is opened on the support plate.

[0010] Preferably, the vertical support plate is located on one side of the support plate, and the adjusting rod drives the vertical support plate to move relative to the support plate, so that a support space is formed between the vertical support plate and the support plate for positioning and supporting the plastic part to be tested.

[0011] Preferably, the limiting groove extends along the length of the supporting plate, and the vertical supporting plate is arranged facing the limiting groove.

[0012] Preferably, it also includes a positioning truss and a support connecting rod; The positioning truss is fixedly connected to the lower part of the detection bracket, the support connecting rod is connected to the positioning truss, and the bottom reflector is supported on the positioning truss and corresponds to the detection mounting plate above and below.

[0013] Preferably, it also includes a vertical adjustment bracket; The vertical adjustment bracket is vertically connected to the positioning truss, and the detection mounting plate is connected to the vertical adjustment bracket and located above the bottom reflector.

[0014] Preferably, the inner hole of the optical path limiting ring is arranged coaxially with the light-transmitting hole, and the bottom reflector is arranged opposite to the visual inspection head.

[0015] Preferably, the detection mounting plate is located between the positioning carrier plate and the bottom reflector plate, and the light-transmitting hole connects the vertical detection light path between the positioning carrier plate and the bottom reflector plate.

[0016] Compared with the prior art, the present invention provides a defect detection device based on plastic production and processing, which has the following beneficial effects: By symmetrically inserting two conveyor belts inside the inspection bracket and placing the positioning plate on the conveying path between the two conveyor belts, the plastic part to be inspected can move from the conveying state to an independent positioning and inspection position. This is different from the existing method where plastic parts are directly inspected by passing under the camera along the conveyor belt, thus improving the positional consistency of the plastic part when it enters the inspection area.

[0017] By pushing the cylinder in conjunction with the limiting conveyor baffle, the limiting conveyor baffle limits the conveying direction of the plastic part to be inspected, and the extension end of the cylinder pushes the plastic part to be inspected toward the area where the positioning carrier plate is located. This is different from the inspection structure that relies solely on the conveyor belt itself for guidance, and reduces the impact of plastic part conveying deviation on visual inspection results.

[0018] The positioning and support structure is formed by a micro drive motor, adjusting linkage, vertical support plate, support carrier plate and limiting slide groove. This allows the vertical support plate to move relative to the support carrier plate and be positioned together with the support carrier plate to support the plastic part to be tested. Unlike the fixed carrier plate type testing structure, this can reduce the slippage, warping or edge suspension of plastic parts during the testing process.

[0019] A vertical inspection light path is formed by a visual inspection head, an inspection mounting plate, a light-passing hole, a light path limiting ring, and a bottom reflector. The light-passing hole and the light path limiting ring constrain the inspection light, and the bottom reflector provides a stable reflective background. Unlike conventional visual inspection methods that lack bottom reflection and light path limiting, this method can reduce light scattering and improve the imaging contrast between the defect area and the background. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the first overall structure of the defect detection device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the second overall structure of the defect detection device provided in an embodiment of the present invention; Figure 3 This is a partial schematic diagram showing the positional relationship between the detection bracket, conveyor belt, and positioning carrier plate provided in an embodiment of the present invention; Figure 4 for Figure 3 A magnified view of a portion of point A in the middle; Figure 5 This is a partial schematic diagram illustrating the positional relationship between the visual inspection head and the inspection bracket provided in an embodiment of the present invention; Figure 6 for Figure 5 A magnified view of a portion of point B in the middle; Figure 7 This is a partial schematic diagram of the lower detection structure provided in an embodiment of the present invention; Figure 8 A partial schematic diagram illustrating the correspondence between the bottom reflector and the visual inspection head provided in an embodiment of the present invention; Figure 9 for Figure 8 A magnified view of a portion of point C in the middle; Figure 10 This is a partial schematic diagram illustrating the connection relationship between the vertical adjustment bracket and the detection mounting plate provided in an embodiment of the present invention.

[0021] In the diagram: 11. Main workbench; 21. Conveyor belt; 31. Inspection bracket; 321. Push cylinder; 322. Limiting conveyor baffle; 41. Horizontal guide rail; 421. Lifting mounting base; 422. Vision inspection head; 431. Positioning truss; 432. Support connecting rod; 433. Bottom reflector; 441. Vertical adjustment bracket; 442. Inspection mounting plate; 443. Optical path limiting ring; 444. Light transmission hole; 51. Positioning carrier plate; 521. Micro drive motor; 522. Adjusting connecting rod; 523. Vertical support plate; 531. Supporting carrier plate; 532. Limiting slide groove. Detailed Implementation

[0022] 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.

[0023] Embodiments of the present invention Reference Figure 1 and Figure 2 This embodiment provides a defect detection device based on plastic production and processing, including a main worktable 11, a conveyor belt 21, a detection bracket 31, a transverse guide rail 41, a lifting mounting base 421, a vision inspection head 422, a positioning carrier plate 51, a detection mounting plate 442, an optical path limiting ring 443, a light-transmitting hole 444, and a bottom reflector 433. The main worktable 11 is adjacent to one side of the detection bracket 31. The main worktable 11 is used to carry the control components, the display components, and the image processing components electrically connected to the vision inspection head 422, so that the mechanical detection part on the detection bracket 31 and the control part on the main worktable 11 are arranged adjacent to each other, which facilitates the operator to centrally control the conveying, positioning, and image acquisition processes.

[0024] Two conveyor belts 21 are symmetrically arranged inside the detection bracket 31. The two conveyor belts 21 form a detection area for the positioning carrier plate 51 to support the plastic parts to be detected. This allows the plastic parts to first enter the detection bracket 31 along the conveyor belts 21 and then switch from the conveying state to the positioning detection state, thereby avoiding the plastic parts from being visually collected directly on the continuously moving conveyor belts 21.

[0025] Reference Figures 1 to 3The positioning carrier plate 51 is supported on the conveying path between the two conveyor belts 21. After the plastic part to be inspected is fed into the inspection bracket 31 by the conveyor belt 21, the positioning carrier plate 51 is located between the two conveyor belts 21, which can form a central support for the plastic part to be inspected, so that the plastic part is transferred from the continuous conveying state to the relatively stable inspection support state. This structure avoids the plastic part being photographed directly on the moving conveyor belt 21, and reduces the impact of vibration, speed fluctuation or uneven force on both sides of the conveyor belt 21 on the inspection image.

[0026] Reference Figures 1 to 3 The testing bracket 31 is equipped with a pushing cylinder 321 and a limiting conveying baffle 322. The pushing cylinder 321 is mounted on the testing bracket 31 and located on the side of the conveyor belt 21. The telescopic end of the pushing cylinder 321 faces the positioning carrier plate 51 between the two conveyor belts 21. The limiting conveying baffle 322 extends along the conveying direction of the conveyor belt 21 and is located above the conveyor belt 21. During the conveying process, the limiting conveying baffle 322 guides and limits the side of the plastic part to be tested, preventing the plastic part from deviating from the area where the positioning carrier plate 51 is located.

[0027] When the push cylinder 321 cooperates with the limiting conveyor baffle 322, the limiting conveyor baffle 322 first constrains the conveying direction of the plastic part to be inspected, so that the plastic part moves stably along the length of the conveyor belt 21. Then, the extension end of the push cylinder 321 applies a lateral pushing action from the side of the plastic part, pushing the plastic part towards the positioning carrier plate 51 between the two conveyor belts 21. Through this cooperation method, the plastic part does not need to rely entirely on the friction and guiding accuracy of the conveyor belt 21 itself to enter the inspection position. This can reduce the possibility that the plastic part will deviate from the inspection area due to irregular shape, uneven weight distribution or changes in conveying speed, so that the subsequent visual inspection head 422 has a more stable positioning basis when acquiring images.

[0028] When the plastic part reaches the vicinity of the detection position, the telescopic end of the push cylinder 321 pushes the plastic part to move towards the positioning carrier plate 51, so that the plastic part can accurately fall into the positioning support position. By the cooperation of the push cylinder 321 and the limit conveying baffle 322, the consistency of the plastic part entering the detection position can be improved, and the missed detection or misjudgment caused by the deviation of the feeding position can be reduced.

[0029] Reference Figure 1 , Figure 2 , Figure 5 and Figure 6 The transverse guide rail 41 is fixedly installed at the middle of the top of the inspection bracket 31. The lifting mounting base 421 is slidably mounted on the transverse guide rail 41, and the vision inspection head 422 is fixedly installed on the lower side of the lifting mounting base 421. The lifting mounting base 421 and the transverse guide rail 41 are slidably engaged, allowing the vision inspection head 422 to be adjusted along the transverse guide rail 41 to be above the positioning carrier plate 51.

[0030] The detection end of the vision inspection head 422 faces the positioning carrier plate 51. When plastic parts of different specifications or different detection areas enter the positioning carrier plate 51, the position of the vision inspection head 422 can be changed by the lifting mounting base 421 so that the vision inspection head 422 corresponds to the detection area of ​​the plastic part to be inspected. This mating structure improves the adaptability of the vision inspection head 422 and reduces the problem of incomplete imaging caused by the deviation between the vision inspection head 422 and the detection area of ​​the plastic part.

[0031] Reference Figure 3 and Figure 4 The positioning carrier plate 51 carries a micro drive motor 521, an adjusting rod 522, a vertical support plate 523, a support plate 531, and a limiting groove 532. The output end of the micro drive motor 521 is connected to the adjusting rod 522 for transmission. The adjusting rod 522 is rotatably connected to the vertical support plate 523. The support plate 531 is stacked on top of the positioning carrier plate 51. The limiting groove 532 is opened on the support plate 531. During operation, the micro drive motor 521 drives the adjusting rod 522 to move. The adjusting rod 522 transmits the output motion of the micro drive motor 521 to the vertical support plate 523, causing the vertical support plate 523 to move relative to the support plate 531.

[0032] After the vertical support plate 523 approaches the support carrier plate 531, a support space is formed between the two to accommodate the edge or bottom of the plastic part to be inspected. The support carrier plate 531 provides bottom support, and the vertical support plate 523 provides lateral positioning, so that the plastic part is less likely to slip, warp or have its edges suspended during the inspection process, thereby improving the consistency of the plastic part's posture when the vision inspection head 422 acquires images.

[0033] Reference Figure 3 and Figure 4 The limiting slide 532 extends along the length of the support plate 531, and the vertical support plate 523 is arranged facing the limiting slide 532. The limiting slide 532 can guide the relative movement direction of the plastic part or the vertical support plate 523, so that the vertical support plate 523 moves in a predetermined direction under the action of the adjusting rod 522. The support plate 531 provides a horizontal support base, and the vertical support plate 523 provides a lateral positioning function. When the two work together, they can simultaneously form bottom support and lateral constraint on the plastic part to be inspected, thereby improving the posture stability of the plastic part during the visual acquisition process.

[0034] Reference Figures 7 to 10The positioning truss 431 is fixedly connected to the lower part of the detection bracket 31. The support connecting rod 432 is connected to the positioning truss 431. The bottom reflector 433 is supported on the positioning truss 431 and corresponds vertically to the detection mounting plate 442. The positioning truss 431 serves as the supporting foundation for the lower detection structure, enabling the bottom reflector 433 to be kept in a stable position below the positioning carrier plate 51. The support connecting rod 432 enhances the connection stability of the positioning truss 431 and reduces the shaking of the bottom reflector 433 during equipment operation.

[0035] Since the bottom reflector 433 corresponds vertically to the detection mounting plate 442, it can provide a stable reflective background under the plastic part to be inspected during visual inspection, thereby improving the image contrast of the edges and defect areas of transparent, semi-transparent or light-colored plastic parts.

[0036] Reference Figures 7 to 10 The vertical adjustment bracket 441 is vertically connected to the positioning truss 431. The detection mounting plate 442 is connected to the vertical adjustment bracket 441 and is located above the bottom reflector 433. The vertical adjustment bracket 441 provides vertical support for the detection mounting plate 442, so that the detection mounting plate 442 can be stably held between the positioning carrier plate 51 and the bottom reflector 433. The detection mounting plate 442 and the bottom reflector 433 are arranged vertically and vertically, which can form a clear light path passage area under the plastic part to be inspected, and avoid the detection mounting plate 442 from shifting, which would cause the light hole 444 to not correspond to the vision inspection head 422 and the bottom reflector 433.

[0037] Reference Figures 7 to 9 A light-transmitting hole 444 is formed through the detection mounting plate 442. A light path limiting ring 443 is fixedly connected to the detection mounting plate 442 and arranged around the light-transmitting hole 444. The inner hole of the light path limiting ring 443 is arranged coaxially with the light-transmitting hole 444. The bottom reflector 433 is arranged opposite to the vision inspection head 422.

[0038] During inspection, the visual inspection head 422, positioning carrier plate 51, light-transmitting hole 444, optical path limiting ring 443, and bottom reflector 433 correspond to each other along the vertical detection optical path. The light-transmitting hole 444 connects the detection optical path between the positioning carrier plate 51 and the bottom reflector 433. The optical path limiting ring 443 constrains the range of light passing through the light-transmitting hole 444, reducing stray light from the surrounding area from entering the visual acquisition area. The bottom reflector 433 is located below the inspection mounting plate 442 and opposite to the visual inspection head 422. It can provide a stable bottom reflective background for transparent, semi-transparent, or light-colored plastic parts, making the edges, gaps, scratches, or areas with abnormal light transmission of the plastic parts more clearly distinguished from the background, thereby improving the imaging stability and defect identification accuracy during the visual inspection process.

[0039] The overall working process and principle of the above embodiments are as follows: In use, the plastic part to be tested is first conveyed into the interior of the testing bracket 31 by two symmetrically arranged conveyor belts 21. The two conveyor belts 21 support and convey the plastic part from both sides. The limiting conveyor baffle 322 laterally limits the plastic part to be tested along the conveying direction of the conveyor belts 21, so that the plastic part can approach the positioning carrier plate 51 along the predetermined conveying path after entering the testing bracket 31, reducing the lateral displacement of the plastic part due to inertia, vibration or uneven force on both sides during the conveying process.

[0040] When the plastic part to be inspected moves to the corresponding position of the positioning carrier plate 51, the telescopic end of the push cylinder 321 extends between the two conveyor belts 21 and applies a pushing action to the plastic part from the side, so that the plastic part to be inspected is transferred from the position of the conveyor belt 21 to the inspection receiving position of the positioning carrier plate 51. After the positioning carrier plate 51 receives the plastic part, the plastic part changes from a state of continuous movement with the conveyor belt 21 to a relatively static or low-disturbance inspection state, thereby providing a stable foundation for subsequent positioning support and visual acquisition.

[0041] Subsequently, the micro drive motor 521 starts and drives the adjusting link 522 to move. Since the adjusting link 522 is rotatably connected to the vertical support plate 523, the adjusting link 522 can transmit the output motion of the micro drive motor 521 to the vertical support plate 523, causing the vertical support plate 523 to move relative to the support plate 531. After the vertical support plate 523 moves closer to the support plate 531, it forms a support space together with the support plate 531 to position and support the edge or bottom of the plastic part to be inspected. The limiting groove 532 limits the relative movement of the plastic part or the support process, keeping the plastic part in the inspection position below the vision inspection head 422 and reducing the impact of warping, slippage or edge suspension of the plastic part on the inspection image.

[0042] After positioning is completed, the lifting mounting base 421 moves along the transverse guide rail 41, so that the vision inspection head 422 is adjusted to be above the plastic part to be inspected. The inspection end of the vision inspection head 422 faces the plastic part on the positioning carrier plate 51. During inspection, the vision inspection head 422 acquires images of the surface, edge or light-transmitting area of ​​the plastic part. The cooperation between the transverse guide rail 41 and the lifting mounting base 421 allows the vision inspection head 422 to be adjusted according to the specifications of the plastic part or the position of the inspection area, thereby ensuring that the vision inspection head 422 corresponds to the area to be inspected.

[0043] During image acquisition, the detection mounting plate 442 is located between the positioning carrier plate 51 and the bottom reflector 433. The light-transmitting hole 444 connects the vertical detection light path between the positioning carrier plate 51 and the bottom reflector 433. The light path limiting ring 443 surrounds the light-transmitting hole 444 to limit the detection light range and reduce stray light entering the detection area. The bottom reflector 433 is arranged opposite to the vision inspection head 422 to provide a stable reflective background under the plastic part to be inspected, so that there is a more obvious difference in brightness or outline between the defect area of ​​the plastic part and the background, which is especially beneficial for the defect identification of transparent, semi-transparent or light-colored plastic parts.

[0044] After the visual inspection head 422 acquires the image, it transmits the image information to the control component on the main workbench 11 for recognition and processing. The control component judges whether there are defects in the plastic part based on the grayscale, contour or color difference in the acquired image. After the inspection is completed, the vertical support plate 523 is reset under the action of the adjusting linkage 522, and the cylinder 321 is pushed to retract. The plastic part to be inspected is removed from the position of the positioning carrier plate 51 and is continued to be transported to the subsequent station by the conveyor belt 21, thus completing one plastic part defect inspection process.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used merely 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0046] 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 defect detection device based on plastic production and processing, characterized in that: It includes a main workbench (11), a conveyor belt (21), a testing bracket (31), a transverse guide rail (41), a lifting mounting base (421), a vision inspection head (422), a positioning carrier plate (51), a testing mounting plate (442), an optical path limiting ring (443), a light-passing hole (444), and a bottom reflector (433). The main workbench (11) is adjacent to one side of the inspection bracket (31). Two conveyor belts (21) are symmetrically arranged inside the inspection bracket (31). The transverse guide rail (41) is fixedly installed at the middle of the top of the inspection bracket (31). The lifting mounting seat (421) is slidably mounted on the transverse guide rail (41). The visual inspection head (422) is fixedly installed on the lower side of the lifting mounting seat (421). The positioning carrier plate (51) is supported on the conveying path between the two conveyor belts (21). The plate (442) is located below the positioning carrier plate (51). The light-transmitting hole (444) is opened through the detection mounting plate (442). The optical path limiting ring (443) is fixedly connected to the detection mounting plate (442) and arranged around the light-transmitting hole (444). The bottom reflector (433) is located below the detection mounting plate (442). The visual inspection head (422), positioning carrier plate (51), light-transmitting hole (444), optical path limiting ring (443) and bottom reflector (433) are arranged correspondingly along the vertical detection optical path.

2. The defect detection device based on plastic production and processing according to claim 1, characterized in that: It also includes a push cylinder (321) and a limit conveying baffle (322); The push cylinder (321) is installed on the detection bracket (31) and located on the side of the conveyor belt (21). The telescopic end of the push cylinder (321) faces the positioning carrier plate (51) between the two conveyor belts (21). The limiting conveyor baffle (322) extends along the conveying direction of the conveyor belt (21) and is located above the conveyor belt (21).

3. The defect detection device based on plastic production and processing according to claim 1, characterized in that: The lifting mounting base (421) slides in cooperation with the transverse guide rail (41), and the detection end of the vision detection head (422) faces the positioning carrier plate (51) and moves along the transverse guide rail (41) with the lifting mounting base (421).

4. The defect detection device based on plastic production and processing according to claim 1, characterized in that: The positioning carrier plate (51) carries a micro drive motor (521), an adjusting link (522), a vertical support plate (523), a support carrier plate (531), and a limiting slide groove (532). The output end of the micro drive motor (521) is connected to the adjusting rod (522) for transmission. The adjusting rod (522) is rotatably connected to the vertical support plate (523). The support plate (531) is stacked and connected above the positioning plate (51). The limiting groove (532) is opened on the support plate (531).

5. A defect detection device based on plastic production and processing according to claim 4, characterized in that: The vertical support plate (523) is located on one side of the support plate (531). The adjusting rod (522) drives the vertical support plate (523) to move relative to the support plate (531), so that a support space is formed between the vertical support plate (523) and the support plate (531) for positioning and supporting the plastic part to be tested.

6. The defect detection device based on plastic production and processing according to claim 4, characterized in that: The limiting groove (532) extends along the length of the supporting plate (531), and the vertical supporting plate (523) is arranged facing the limiting groove (532).

7. The defect detection device based on plastic production and processing according to claim 1, characterized in that: It also includes a positioning truss (431) and a support connecting rod (432). The positioning truss (431) is fixedly connected to the lower part of the detection bracket (31), the support connecting rod (432) is connected to the positioning truss (431), and the bottom reflector (433) is supported on the positioning truss (431) and corresponds vertically to the detection mounting plate (442).

8. A defect detection device based on plastic production and processing according to claim 7, characterized in that: It also includes a vertical adjustment bracket (441). The vertical adjustment bracket (441) is vertically connected to the positioning truss (431), and the detection mounting plate (442) is connected to the vertical adjustment bracket (441) and located above the bottom reflector (433).

9. A defect detection device based on plastic production and processing according to claim 1, characterized in that: The inner hole of the optical path limiting ring (443) is coaxially arranged with the light-transmitting hole (444), and the bottom reflector (433) is arranged opposite to the visual inspection head (422).

10. A defect detection device based on plastic production and processing according to claim 8, characterized in that: The detection mounting plate (442) is located between the positioning carrier plate (51) and the bottom reflector plate (433), and the light-transmitting hole (444) connects the vertical detection light path between the positioning carrier plate (51) and the bottom reflector plate (433).

Images