Surface bubble detection mechanism for rubber articles

Abstract

The application discloses a rubber product surface bubble detection mechanism and relates to the field of rubber new material detection.The rubber product surface bubble detection mechanism comprises a main plate, a bottom frame installed at the lower end of the main plate through bolts, a light source module installed in the bottom frame through bolts, a light shielding cover installed at the upper end of the main plate, and a CCD detection camera arranged at the center of the light shielding cover.The rubber product surface bubble detection mechanism can drive the threaded rod at the output end of the servo motor to rotate at a constant speed when smoothing is needed, drive the positioning frame at the lower end of the movable block to move synchronously, and drive the smoothing roller inside the positioning frame to move along a predetermined path, so that the roller can automatically adjust the contact pressure and angle according to the ups and downs of the rubber product surface during movement, and the roller can be closely attached to the surface of the rubber product, thereby improving the uniformity and coverage effect of smoothing and improving the overall smoothing quality.

Description

Technical Field

[0001] This invention relates to the field of rubber new material testing technology, specifically to a device for detecting air bubbles on the surface of rubber products. Background Technology

[0002] A surface bubble testing agency for rubber products refers to a third-party technical service organization that specializes in testing the surface quality of rubber and polymer new material products. It mainly focuses on accurately identifying and evaluating defects such as surface bubbles, pores, pinholes, and bulges generated during the vulcanization, molding, and injection molding processes of products.

[0003] In existing technologies, manual observation, where the human eye is pointed directly at a light source for an extended period of time, can easily cause eye injuries to workers and compromise safety.

[0004] To overcome the above shortcomings, a prior art Chinese patent (publication number CN219715262U) discloses a rubber product bubble detection device, including a base plate, a movable wheel provided on the lower side of the base plate, a sliding groove opened on the upper side of the base plate, a fixed surface fixedly connected to the upper side of the base plate, a clamping block one fixedly connected to the upper side of the fixed surface, a sliding surface slidably connected to the bottom wall of the sliding groove, a clamping block two fixedly connected to the upper side of the sliding surface, a threaded rod rotatably connected to the left side of the sliding surface, and a threaded hole adapted to the threaded rod opened on the left side of the fixed surface. The left end of the threaded rod passes through the threaded hole and extends out of the left side of the fixed surface. In this way, when the rubber product to be tested is too narrow to be placed on the clamping block, the distance between clamping block one and clamping block two can be adjusted simply by rotating the rotating disk, making the adjustment of the bubble detection device simpler and faster, greatly improving the adjustment speed of the detection device, and thus improving the detection efficiency.

[0005] To overcome the aforementioned shortcomings, a Chinese patent (publication number CN212031319U) discloses a device for detecting the surface coating of rubber products. This device solves the problem that existing detection devices often expose the eyes to light for extended periods, leading to inaccurate judgments of the test results. The device includes a lightbox and an LED light housed within it. The LED light is connected to a power cord, and a wire hole is provided on the side wall of the lightbox through which the power cord passes. A detection plate is mounted on the upper surface of the lightbox, with a detection port extending through both the upper and lower surfaces. A base is located at the bottom of the lightbox, and a rotating shaft is vertically mounted on the upper surface of the base. A rotating groove is formed by a recess in the center of the lower surface of the lightbox, containing a bearing. The lightbox and the rotating shaft are rotatably connected via the bearing. This design effectively shields the light during testing, preventing prolonged exposure to the operator's eyes and avoiding misjudgments of the product test results.

[0006] While existing technologies can overcome the shortcomings mentioned above, other problems still exist in their operation. For example, if the rubber products are not placed evenly by the staff when they are placed inside the testing facility, it can easily lead to testing deviations in thinner types of rubber products, affecting the accuracy of the testing. Summary of the Invention

[0007] The purpose of this invention is to provide a bubble detection mechanism for rubber products, in order to solve the problem mentioned in the background art that if the rubber products are not placed evenly by the operator when they are placed inside the detection mechanism, the thinner types of rubber products are prone to detection deviations, which affects the accuracy of the detection.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a bubble detection mechanism for rubber products, comprising a main board and a base frame bolted to the lower end of the main board, wherein a light source module is bolted inside the base frame, a light shield is mounted on the upper end of the main board, and a CCD detection camera is disposed at the center of the light shield, a transparent plate is disposed at the center of the main board, a smoothing mechanism is disposed on the left side of the main board, and the smoothing mechanism smooths the rubber products on the transparent plate, and a pressure gradient mechanism is disposed inside the light shield, and the pressure gradient mechanism generates a contrast between the bubbles on the surface of the rubber products.

[0009] Furthermore, an arc block is installed on the upper left side of the motherboard, and a locking plate is slidably connected inside the arc block, with the lower end of the locking plate aligned with the upper left side of the transparent plate.

[0010] Furthermore, a fixing plate is fixedly installed on the inner side of the arc block, and a threaded knob is rotatably installed at the middle end of the fixing plate, and the lower end of the threaded knob is threadedly connected to the locking plate.

[0011] Furthermore, the smoothing and finishing mechanism is equipped with a threaded screw, and both ends of the threaded screw are rotatably installed with the rear end of the light shield. The left side of the threaded screw is connected to the output end of the servo motor. A movable block is threadedly installed on the surface of the threaded screw. A positioning frame is installed at the lower end of the movable block. A limit rod is installed through the movable block above the front end of the positioning frame. Both ends of the limit rod are fixedly installed on the inner wall of the light shield.

[0012] Furthermore, a smoothing roller is fitted at the bottom of the positioning frame, and the portion of the smoothing roller located outside the positioning frame is rotatably mounted inside the sleeve block. A guide rod is fixedly mounted at the upper end of the sleeve block, and the upper end of the guide rod is installed through the side of the positioning frame.

[0013] Furthermore, a pressure spring is sleeved on the surface of the guide rod, and the lower end of the pressure spring is fixedly connected to the upper end of the sleeve block, while the upper end of the pressure spring is connected to the lower side of the positioning frame. A staining sheet is adhered to the surface of the smoothing roller.

[0014] Furthermore, the pressure gradient mechanism is provided with a lifting plate, and the lifting plate is in the shape of an "L". The upper end of the lifting plate is installed at the output end of the hydraulic telescopic rod, and the middle end of the hydraulic telescopic rod is installed at the upper end of the light shield. The lower end of the lifting plate is provided with a pressure plate, and the pressure plate corresponds to the upper end of the transparent plate. The pressure plate is a transparent plate.

[0015] Furthermore, a driven shaft is rotatably mounted at the middle end of the lifting plate, and a slide rod is installed through the lower end of the lifting plate, with both ends of the slide rod connected to the upper end of the pressing plate.

[0016] Furthermore, the left side of the driven shaft is configured as a threaded section, and an adjusting plate is threadedly mounted on the surface of the threaded section, with the lower end of the adjusting plate fixedly mounted on the upper end of the pressure plate.

[0017] Furthermore, a driven gear is fixedly installed on the right side of the driven shaft, and an auxiliary gear is meshed on the side of the driven gear. The center of the auxiliary gear is rotatably installed on the side of the light shield, and a driving gear is meshed on the rear end of the auxiliary gear. The center of the driving gear is connected to the right end of the threaded screw.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. When smoothing is required, the servo motor on the side of the light shield is activated. The servo motor precisely drives the threaded rod at its output end to rotate at a constant speed, thereby driving the positioning frame at the lower end of the movable block to move synchronously. The movement of the positioning frame, in turn, pulls the smoothing roller on its inner side to move along a predetermined path. When the smoothing roller gradually approaches and contacts the arc block, with the help of the arc block's unique curvature, the smoothing roller moves upward along the groove on the side of the positioning frame after contact. At this time, the sleeve block at the end of the smoothing roller drives the guide rod through the side of the positioning frame and simultaneously squeezes the pressure spring, forming elastic buffer and feedback, thereby achieving adaptive fit adjustment. This allows the smoothing roller to automatically adjust the contact pressure and angle in real time according to the undulations of the rubber product surface during the movement, always closely fitting the surface of the rubber product, thereby significantly improving the smoothing uniformity and coverage effect, and effectively promoting the improvement of the overall smoothing quality. Furthermore, when placing the rubber product, it is placed stably on the transparent plate, with the left side of the rubber product aligned with the lower end of the locking plate. Then, by rotating the threaded knob on the fixing plate, the rotation of the threaded knob causes the locking plate to move up and down along the limiting groove inside the arc block, thereby precisely controlling the force and position of the locking plate pressing down on the side of the rubber product, forming a stable clamping and fixing, achieving the effect of locking and limiting, and preventing the product from shifting during subsequent inspection.

[0019] 2. The height adjustment of the lifting plate causes the pressure plate at its bottom to descend, applying vertical pressure to the rubber product. The pressure plate itself is made of transparent material, so it will not obstruct or interfere with the shooting field of the CCD inspection camera. At this time, comparative judgment can be made. When the dark spots produced by light become significantly larger or flatter with the increase of pressure, they can be identified as surface bubbles. This is because after the surface protrusion is flattened, the internal air is squeezed and diffuses to the surroundings, resulting in a significant change in the shape of light and shadow. If the shape and size of the dark spots remain almost unchanged, they are identified as internal impurities or deep cavities, because such defects do not deform due to changes in surface pressure. This allows for clear comparison and differentiation, making the test results more accurate and reliable, and effectively reducing misjudgments.

[0020] 3. As the driven gear and driven rod continue to rotate, the threaded section at the end of the driven rod causes the adjusting plate connected to its surface to move laterally. The lateral movement of the adjusting plate causes the pressure plate connected at the bottom to move slightly to the right along the direction of the slide rod, thus creating a kneading shearing force effect. This causes the pressure plate to produce a slight lateral offset during the pressing process. If there are tiny gaps on the surface of the rubber product, the edges of the gaps will produce obvious relative displacement or deformation under the action of this kneading force. This allows the vision system to capture and identify them more clearly, greatly improving the detection sensitivity of surface micro-cracks and opening defects, and further enhancing the overall detection effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention viewed from below.

[0023] Figure 3 This is a cross-sectional three-dimensional structural diagram of the present invention.

[0024] Figure 4 This is a top-view three-dimensional structural diagram of the transparent plate of the present invention.

[0025] Figure 5 This is a side view of the three-dimensional structure of the smoothing roller of the present invention.

[0026] Figure 6This is a three-dimensional structural diagram of the locking plate of the present invention viewed from below.

[0027] Figure 7 This is a side view of the three-dimensional structure of the sleeve block of the present invention.

[0028] Figure 8 This is a three-dimensional structural diagram of the pressing plate of the present invention in the pressing state.

[0029] Figure 9 This is a side view of the three-dimensional structure of the present invention.

[0030] Figure 10 This is a cross-sectional three-dimensional structural diagram of the driven shaft of the present invention.

[0031] In the diagram: 1. Main board; 2. Base frame; 3. Light source module; 4. Transparent plate; 5. Light shield; 6. CCD inspection camera; 7. Arc block; 8. Locking plate; 9. Fixing plate; 10. Threaded knob; 11. Threaded screw; 12. Movable block; 13. Positioning frame; 14. Limiting rod; 15. Smoothing roller; 16. Dirt sheet; 17. Sleeve block; 18. Guide rod; 19. Pressure spring; 20. Hydraulic telescopic rod; 21. Lifting plate; 22. Pressing plate; 23. Driven shaft; 24. Driven gear; 25. Driven gear; 26. Auxiliary gear; 27. Threaded section; 28. Adjusting plate; 29. ​​Slide rod. Detailed Implementation

[0032] 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.

[0033] Example 1: As Figures 1-7The technical solution shown is used for a surface bubble detection mechanism for rubber products. To address the problem that rubber products easily develop wrinkles after placement, affecting detection accuracy, the following is disclosed: a main board 1 and a base frame 2 bolted to the lower end of the main board 1, with a light source module 3 bolted inside the base frame 2; a light shield 5 mounted on the upper end of the main board 1, with a CCD detection camera 6 positioned at the center of the light shield 5; a transparent plate 4 positioned at the center of the main board 1; a smoothing mechanism on the left side of the main board 1, which smooths the rubber products on the transparent plate 4; an arc block 7 mounted on the upper left side of the main board 1, with a locking plate 8 slidably connected inside the arc block 7, and the lower end of the locking plate 8 aligned with the upper left side of the transparent plate 4; a fixing plate 9 fixedly mounted inside the arc block 7, with a threaded knob 10 rotatably mounted in the middle of the fixing plate 9, and the lower end of the threaded knob 10 threadedly connected to the locking plate 8; and a threaded screw 11 provided with the smoothing mechanism. Both ends are rotatably mounted to the rear end of the light shield 5, and the left side of the threaded screw 11 is connected to the output end of the servo motor. The surface of the threaded screw 11 is threaded with a movable block 12. The lower end of the movable block 12 is mounted with a positioning frame 13. The movable block 12 above the front end of the positioning frame 13 is internally mounted with a limit rod 14. The two ends of the limit rod 14 are fixedly mounted on the inner wall of the light shield 5. The bottom of the positioning frame 13 is fitted with a smoothing roller 15. The part of the smoothing roller 15 located outside the positioning frame 13 is rotatably mounted inside the sleeve block 17. The upper end of the sleeve block 17 is fixedly mounted with a guide rod 18. The upper end of the guide rod 18 is internally mounted on the side of the positioning frame 13. The surface of the guide rod 18 is fitted with a pressure spring 19. The lower end of the pressure spring 19 is fixedly connected to the upper end of the sleeve block 17. The upper end of the pressure spring 19 is connected to the lower side of the positioning frame 13. The surface of the smoothing roller 15 is adhered with a staining sheet 16.

[0034] When detecting bubbles on the surface of rubber products, open the opening at the front of the light shield 5 and place the new rubber product inside the main board 1. The main board 1 is supported by the transparent plate 4. The bottom frame 2 of the main board 1 is equipped with a light source module 3. When testing is required, the light source module 3 is activated to emit light, which shines through the transparent plate 4 onto the bottom of the rubber product. At this time, the CCD detection camera 6 on the light shield 5 captures the state of the rubber product. The black dots indicate bubbles. When placing the rubber product on the transparent plate 4, align the left side of the rubber product with the lower end of the locking plate 8. By rotating the threaded knob 10 on the fixing plate 9, the threaded knob 10 rotates and drives the locking plate 8 to move up and down along the internal limit of the arc block 7, thereby controlling the locking plate 8 to press down on the upper left side of the rubber product to form a fixed position and achieve the locking limit effect. When smoothing is required, the servo motor on the side of the light shield 5 is activated, and the servo motor drives... The threaded rod at its output end rotates, driving the movable block 12 connected to the surface thread. The movable block 12 on the front side is limited under the guidance of the limiting rod 14, so that the positioning frame 13 at the lower end of the movable block 12 moves accordingly. The movement of the positioning frame 13 drives the smoothing roller 15 on the inner side to move. When the smoothing roller 15 contacts the arc block 7, due to the curvature of the arc block 7, the smoothing roller 15 moves upward along the side groove of the positioning frame 13 after contact. At this time, the end sleeve block 17 of the smoothing roller 15 drives the guide rod 18 to pass through the side of the positioning frame 13 and squeeze the pressure spring 19 to achieve adaptive fitting adjustment, so that when the smoothing roller 15 moves, it can adaptively fit the surface of the rubber product, thereby improving the smoothing effect and promoting the smoothing quality. A layer of dirt-adhesive sheet 16 is adhered to the surface of the smoothing roller 15. The dirt-adhesive sheet 16 can adsorb impurities as the smoothing roller 15 rotates, which has a cleaning effect on the surface of the rubber product and improves the accuracy of detection.

[0035] Example 2: Figures 1-8 The technical solution shown, based on Embodiment 1, discloses the following to address the problem of poor detection contrast: a pressure gradient mechanism is provided inside the light shield 5, which generates contrast for the air bubbles on the surface of the rubber product. The pressure gradient mechanism is provided with a lifting plate 21, which is L-shaped. The upper end of the lifting plate 21 is installed at the output end of the hydraulic telescopic rod 20, and the middle end of the hydraulic telescopic rod 20 is installed at the upper end of the light shield 5. A pressure plate 22 is provided at the lower end of the lifting plate 21, which corresponds to the upper end of the transparent plate 4, and the pressure plate 22 is a transparent plate.

[0036] During routine testing, simply detecting bubbles in the normal state of rubber products can easily lead to errors. During testing, as the smoothing roller 15 completes its smoothing process, the hydraulic telescopic rod 20 can be activated, allowing the output end of the hydraulic telescopic rod 20 to adjust the height of the lifting plate 21. This height adjustment causes the pressure plate 22 at its bottom to descend and press the rubber product. The pressure plate 22 itself is transparent and will not affect the CCD inspection camera 6's imaging. Comparative judgment can then be made. If the dark spots under light become significantly larger or flatter with increasing pressure, they can be identified as surface bubbles because the surface protrusions are flattened, and the internal air is squeezed outwards, diffusing light and shadow. If the shape and size of the dark spots remain almost unchanged, they can be identified as internal impurities or deep cavities. Comparative judgment can be made, resulting in more accurate testing.

[0037] Example 3: Figure 2 and Figures 5-10 The technical solution shown, based on Embodiment 1 and Embodiment 2, discloses the following to address the problem of incomplete surface crack detection: a driven shaft 23 is rotatably mounted at the middle of the lifting plate 21, and a slide rod 29 is installed through the lower end of the lifting plate 21. The two ends of the slide rod 29 are connected to the upper end of the pressure plate 22. A threaded section 27 is set on the left side of the driven shaft 23, and an adjusting plate 28 is threadedly mounted on the surface of the threaded section 27. The lower end of the adjusting plate 28 is fixedly mounted on the upper end of the pressure plate 22. A driven gear 24 is fixedly mounted on the right side of the driven shaft 23, and an auxiliary gear 26 is meshed on the side of the driven gear 24. The center of the auxiliary gear 26 is rotatably mounted on the side of the light shield 5, and a driving gear 25 is meshed on the rear end of the auxiliary gear 26. The center of the driving gear 25 is connected to the right end of the threaded screw 11.

[0038] As the smoothing roller 15 moves to the right side of the main board 1, the pressure plate 22 descends to perform a pressure comparison and bubble detection. Simultaneously, as the pressure plate 22 and the lifting plate 21 descend, the driven shaft 23 at the middle of the lifting plate 21 also descends. The driven shaft 23 moves along the side of the light shield 5, causing the driven gear 24 at its end to mesh with the auxiliary gear 26. Then, with the reactivation of the screw 11, the smoothing roller 15 moves to the right to its position against the light shield 5 for a secondary adjustment. The rotation of the screw 11 drives the right-side drive gear 25 to rotate. The rotation of the auxiliary gear 26 drives the driven gear 24 that has just meshed with it. At this time, the pressure plate 22 is pressed against the surface of the rubber product. As the driven gear 24 and the driven rod rotate, the threaded section 27 at the end of the driven rod rotates, driving the adjusting plate 28 connected to the surface thread. The lateral movement of the adjusting plate 28 causes the pressure plate 22 at the bottom to slightly shift to the right along the direction of the slide rod 29, thereby creating a kneading effect. This allows the pressure plate 22 to slightly shift during pressing. If there are gaps on the surface of the rubber product, they can be more clearly captured with the generation of kneading force, improving the detection effect.

[0039] 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 mechanism for detecting air bubbles on the surface of rubber products, comprising a main board (1) and a base frame (2) bolted to the lower end of the main board (1), wherein a light source module (3) is bolted inside the base frame (2), and a light shield (5) is mounted on the upper end of the main board (1), and a CCD detection camera (6) is disposed at the center of the light shield (5), characterized in that: The main board (1) has a transparent plate (4) at its center. A smoothing mechanism is provided on the left side of the main board (1). The smoothing mechanism smooths the rubber products on the transparent plate (4). The light shield (5) has a pressure gradient mechanism inside. The pressure gradient mechanism creates a contrast between the air bubbles on the surface of the rubber products.

2. The bubble detection mechanism for rubber products according to claim 1, characterized in that: An arc block (7) is installed on the upper left side of the main board (1), and a locking plate (8) is slidably connected inside the arc block (7), with the lower end of the locking plate (8) aligned with the upper left side of the transparent plate (4).

3. The bubble detection mechanism for rubber product surfaces according to claim 2, characterized in that: A fixing plate (9) is fixedly installed on the inner side of the arc block (7), and a threaded knob (10) is rotatably installed at the middle end of the fixing plate (9), and the lower end of the threaded knob (10) is threadedly connected to the locking plate (8).

4. The bubble detection mechanism for rubber product surfaces according to claim 3, characterized in that: The smoothing and finishing mechanism is provided with a threaded screw (11), and the two ends of the threaded screw (11) are rotatably installed with the rear end of the light shield (5). The left side of the threaded screw (11) is connected to the output end of the servo motor. The surface of the threaded screw (11) is threaded with a movable block (12). The lower end of the movable block (12) is equipped with a positioning frame (13). A limit rod (14) is installed through the movable block (12) above the front end of the positioning frame (13). The two ends of the limit rod (14) are fixedly installed on the inner wall of the light shield (5).

5. The bubble detection mechanism for rubber product surfaces according to claim 4, characterized in that: The bottom of the positioning frame (13) is fitted with a smoothing roller (15), and the part of the smoothing roller (15) located outside the positioning frame (13) is rotatably installed inside the sleeve block (17). The upper end of the sleeve block (17) is fixedly installed with a guide rod (18), and the upper end of the guide rod (18) is installed through the side of the positioning frame (13).

6. The bubble detection mechanism for rubber product surfaces according to claim 5, characterized in that: The guide rod (18) is fitted with a pressure spring (19), and the lower end of the pressure spring (19) is fixedly connected to the upper end of the sleeve block (17), and the upper end of the pressure spring (19) is connected to the lower side of the positioning frame (13). The smoothing roller (15) is adhered with a staining sheet (16).

7. The bubble detection mechanism for rubber product surfaces according to claim 6, characterized in that: The pressure gradient mechanism is provided with a lifting plate (21), and the lifting plate (21) is L-shaped. The upper end of the lifting plate (21) is installed at the output end of the hydraulic telescopic rod (20), and the middle end of the hydraulic telescopic rod (20) is installed at the upper end of the light shield (5). The lower end of the lifting plate (21) is provided with a pressure plate (22), and the pressure plate (22) corresponds to the upper end of the transparent plate (4). The pressure plate (22) is a transparent plate.

8. The bubble detection mechanism for rubber product surfaces according to claim 7, characterized in that: The middle end of the lifting plate (21) is rotatably mounted with a driven shaft (23), and the lower end of the lifting plate (21) is through-mounted with a slide rod (29), and the two ends of the slide rod (29) are connected to the upper end of the pressing plate (22).

9. The bubble detection mechanism for rubber product surfaces according to claim 8, characterized in that: The left side of the driven shaft (23) is set as a threaded section (27), and an adjusting plate (28) is threadedly installed on the surface of the threaded section (27), and the lower end of the adjusting plate (28) is fixedly installed on the upper end of the pressure plate (22).

10. The bubble detection mechanism for rubber product surfaces according to claim 9, characterized in that: A driven gear (24) is fixedly installed on the right side of the driven shaft (23), and an auxiliary gear (26) is meshed on the side of the driven gear (24). The center of the auxiliary gear (26) is rotatably installed on the side of the light shield (5), and a driving gear (25) is meshed on the rear end of the auxiliary gear (26). The center of the driving gear (25) is connected to the right end of the threaded screw (11).

Images