A visual detection device and method for appearance defects of a precision mold

Abstract

The application relates to the technical field of new material detection, in particular to a visual detection equipment and method for appearance defects of a precision mold, which comprises a supporting table, a placing table is arranged on the supporting table, a supporting frame is arranged on the supporting table, a top plate is arranged at the top of the supporting frame, an annular air blowing mechanism is arranged in the supporting table, a lifting mechanism is arranged between the supporting table and the top plate, an annular visual detection mechanism is arranged on the lifting mechanism in a driven mode, and a synchronous driving mechanism is arranged between the annular air blowing mechanism and the annular visual detection mechanism. The annular surrounding detection structure is adopted to replace a traditional mechanical arm and a multi-axis detection mode, the precision mold with a large self weight does not need to be rotated and moved during the detection process, the mold does not need to be repeatedly fixed and disassembled, and the detection process is greatly simplified; the annular air blowing mechanism is arranged in cooperation with a single-channel pneumatic slip ring structure, continuous rotary gas supply without winding can be realized, and the problems of false detection and missed detection caused by impurity shielding can be effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of new material testing technology, specifically to a visual inspection device and method for detecting appearance defects in precision molds. Background Technology

[0002] Precision molds are core tooling in industries such as machinery manufacturing and injection molding. Scratches, dents, bumps, color differences, and other appearance defects on the mold surface directly affect the product processing quality and the mold's service life. Therefore, appearance inspection is an important process for mold manufacturing and daily maintenance.

[0003] Current visual inspection equipment for mold appearance defects still suffers from numerous technical shortcomings in practical production applications, making it difficult to meet the demands of high-quality, mass production. Firstly, most existing visual inspection equipment employs robotic arms or multi-axis inspection structures, lacking a ring-shaped inspection method suitable for molds. When performing axial multi-angle and different height inspections, it is usually necessary to rotate and move the mold, which is heavy; the rotating base also requires additional workpiece fixation before operation, making mold assembly and disassembly cumbersome and significantly reducing inspection efficiency. Secondly, mold surfaces often adhere to metal shavings, dust, oil, and other impurities. Most existing equipment lacks a pre-cleaning structure, allowing impurities to obscure defect locations, further increasing the difficulty of defect identification. Thirdly, the lens angle and equipment height of traditional visual inspection equipment are difficult to adjust flexibly, making it unsuitable for precision molds of different specifications and shapes. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a well-designed visual inspection device and method for detecting defects in the appearance of precision molds, which can solve the aforementioned problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: it includes a support platform, a placement platform on the support platform, a support frame on the support platform, a top plate on the top of the support frame, an annular air blowing mechanism inside the support platform, a lifting mechanism between the support platform and the top plate, an annular visual inspection mechanism driven on the lifting mechanism, and a synchronous drive mechanism between the annular air blowing mechanism and the annular visual inspection mechanism.

[0006] Preferably, the annular air blowing mechanism includes a drive gear ring, which is rotatably mounted inside the support platform via a bearing around the placement platform. A drive gear is located at the rear of the support platform. A synchronous top ring is fixedly mounted on the top of the drive gear ring, which extends to the top of the support platform. A mounting plate is provided on the top of the synchronous top ring, and a lifting air blowing head is provided on the mounting plate. An interference-free air supply mechanism is provided below the placement platform.

[0007] Preferably, the lifting air head includes a corrugated telescopic tube, which is located on the top of the mounting plate. Telescopic cylinders are provided on both sides of the mounting plate of the corrugated telescopic tube. A mounting frame is connected to the top of each pair of telescopic cylinders. A horn-shaped nozzle is provided in the mounting frame. One end of the horn-shaped nozzle is connected to the top of the corrugated telescopic tube, and the bottom end of the corrugated telescopic tube is connected to the pipeline of the non-interference air supply mechanism.

[0008] Preferably, the interference-free gas supply mechanism includes a single-channel pneumatic slip ring, a support column is provided at the bottom of the placement platform, a movable chamber is provided in the support platform corresponding to the placement platform, the support column is connected to the bottom of the movable chamber, the single-channel pneumatic slip ring is located in the movable chamber and is sleeved on the outer periphery of the support column, the rotating end of the single-channel pneumatic slip ring is connected to a gas supply pipe, the gas supply pipe passes through the synchronous top ring and the mounting plate and is connected to the bottom end of the corrugated telescopic pipe, the fixed end of the single-channel pneumatic slip ring is provided with an air inlet pipe, and the air inlet pipe is connected to an external gas supply device.

[0009] Preferably, the lifting mechanism includes a guide rod and a drive screw, which are respectively disposed on both sides of the support platform. A drive motor is disposed on one side of the support platform corresponding to the drive screw. The output end of the drive motor is connected to a gear reducer, and the output end of the gear reducer is drivenly connected to the bottom end of the drive screw. The top end of the guide rod is connected to the top plate, and the top end of the drive screw is connected to the top plate. A connecting frame is slidably disposed on the guide rod, and a connecting frame is threadedly connected to the drive screw.

[0010] Preferably, the annular visual inspection mechanism includes a mounting ring, with its two sides connected to a connecting frame one and a connecting frame two, respectively. A driving gear ring two is rotatably mounted inside the mounting ring via a bearing, and a driving gear two is rotatably mounted inside the mounting ring corresponding to the driving gear ring two. The driving gear ring two meshes with the driving gear two. A synchronous inner ring is provided on the inner side of the driving gear ring two, extending to the inner side of the mounting ring. An adjustable visual inspection head is provided on the inner side of the synchronous inner ring corresponding to the lifting air blowing head.

[0011] Preferably, the adjustable vision inspection head includes a mounting frame connected to a synchronous inner ring, the vision inspection head being rotatably mounted on the mounting frame, and a control motor being provided on one side of the mounting frame, the output end of which is connected to the vision inspection head.

[0012] Preferably, the synchronous drive mechanism includes a spline shaft, which is rotatably mounted inside the support platform. A spline bearing sleeve is installed at both the top and bottom of the first drive gear. The first drive gear has a spline groove corresponding to the spline shaft. A spline bearing sleeve is installed at the top of the second drive gear, which also has a spline groove corresponding to the spline shaft. The spline shaft sequentially passes through the first spline bearing sleeve, the first drive gear, the second spline bearing sleeve, and the second drive gear, and is rotatably connected to the top plate. A second drive motor is installed at the bottom of the support platform corresponding to the spline shaft. The output end of the second drive motor is connected to a second gear reducer, and the output end of the second gear reducer is drivenly connected to the bottom end of the spline shaft.

[0013] Preferably, the bottom of the mounting ring is provided with several supplementary lights.

[0014] Preferably, a visual inspection device and method for detecting appearance defects in precision molds: 1. Mold placement and positioning: Place the precision mold to be tested stably on the placement table to complete the positioning, check the initial state of each mechanism, and confirm that the air and electrical circuits are connected normally. 2. Pre-adjust the ring position, start the second drive motor, and drive the spline shaft to rotate through the second gear reducer. The spline shaft synchronously drives the first drive gear and the second drive gear to rotate, respectively driving the first drive gear ring and the second drive gear ring to rotate. This causes the lifting air blowing head of the ring blowing mechanism and the adjustable vision inspection head of the ring vision inspection mechanism to rotate synchronously to the target position on the surface of the mold to be inspected and then stop. 3. Visual inspection height adjustment: Start the drive motor one to drive the drive screw to rotate, and with the help of the guide rod, drive the connecting frame one and the connecting frame two to descend. Adjust the ring visual inspection mechanism to the appropriate height of the corresponding mold to be inspected and then stop. IV. Air blowing height adjustment and purging: The telescopic cylinder drives the corrugated telescopic tube and the trumpet-shaped nozzle to move vertically, adjusting the lifting air head to the appropriate air blowing height at the position to be tested; the external air supply equipment is started, and the airflow passes through the air inlet pipe, single-channel pneumatic slip ring, air supply pipe, and corrugated telescopic tube and is sprayed out from the trumpet-shaped nozzle to perform high-pressure purging of oil and waste at this position; after purging is completed, the telescopic cylinder drives the lifting air head to retract and reset. V. Visual Inspection Angle Adjustment and Acquisition: Start the control motor to drive the visual inspection head to rotate, and adjust the shooting angle to align with the cleaned mold surface; turn on the supplementary light at the bottom of the mounting ring to supplement the light, and the visual inspection head acquires images of the cleaned mold surface to identify appearance defects such as scratches and dents; if other positions need to be inspected, steps two to five can be repeated, or the position of the ring mechanism or the height of the visual inspection mechanism can be adjusted individually according to the actual working conditions until the full surface inspection of the mold is completed.

[0015] The beneficial effects of the present invention after adopting the above structure are: 1. This invention adopts a ring-shaped detection structure to replace the traditional robotic arm and multi-axis detection method. The detection process does not require rotating or moving the heavy precision mold, nor does it require repeated fixing and disassembly of the mold. This greatly simplifies the detection process, reduces labor intensity, and effectively improves the overall detection efficiency and ease of operation of the mold.

[0016] 2. The present invention is equipped with a ring-shaped air blowing mechanism and a single-channel pneumatic slip ring structure, which can realize continuous rotational air supply without winding. It can blow away dust, metal debris and oil stains on the mold surface in all directions and evenly, avoiding impurities from blocking the detection area and providing a clean detection base for subsequent visual inspection. It effectively avoids false detection and missed detection problems caused by impurities blocking the detection area.

[0017] 3. This invention features a height-adjustable ring-shaped detection mechanism and a pitch-adjustable visual inspection head, which can flexibly adjust the detection height and shooting angle according to the size and shape of the mold. It can specifically complete image acquisition of complex positions such as the mold plane, side wall, and corners, with a wide detection coverage, which can meet the all-round inspection needs of precision molds of different specifications. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the front structure of the present invention; Figure 3 This is a three-dimensional structural diagram of one side of the present invention; Figure 4 This is a schematic diagram of the internal structure of the top of the support platform of the present invention; Figure 5 This is a side view half-section structural diagram of the support platform of the present invention; Figure 6 This is a schematic diagram of the front support platform half-section structure of the present invention; Figure 7 This is a diagram of the internal structure of the mounting ring of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the support platform of the present invention in half section; Figure 9 This is a schematic diagram of the front external three-dimensional structure of the present invention; Figure 10 yes Figure 9 Enlarged view of the structure at point A in the middle; Figure 11 yes Figure 9 Enlarged view of the structure at point B in the middle.

[0019] Explanation of reference numerals in the attached figures: Support platform 1, placement platform 2, support frame 3, top plate 4, annular air blowing mechanism 5, drive gear ring 1 501, drive gear 1 502, synchronous top ring 503, mounting plate 504, lifting air blowing head 505, interference-free air supply mechanism 506, corrugated telescopic tube 5051, telescopic cylinder 5052, mounting frame 5053, trumpet-shaped nozzle 5054, single-channel pneumatic slip ring 5061, support column 5062, movable chamber 5063, air supply pipe 5064, air inlet pipe 5065, lifting mechanism 6, guide rod 601, drive screw 6 02, Drive motor 1 603, Gear reducer 1 604, Connecting bracket 1 605, Connecting bracket 2 606, Circular vision inspection mechanism 7, Mounting ring 701, Drive gear ring 2 702, Drive gear 2 703, Synchronous inner ring 704, Adjustable vision inspection head 705, Mounting bracket 7051, Vision inspection head 7052, Control motor 7053, Synchronous drive mechanism 8, Spline shaft 801, Spline bearing sleeve 1 802, Spline bearing sleeve 2 803, Drive motor 2 804, Gear reducer 2 805, Supplemental light 9. Detailed Implementation

[0020] 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.

[0021] like Figure 1 - Figure 11 As shown, the present invention proposes a visual inspection device and method for detecting defects in the appearance of precision molds. It includes a support platform 1, a placement platform 2 on the support platform 1, a support frame 3 on the support platform 1, a top plate 4 on the top of the support frame 3, an annular air blowing mechanism 5 inside the support platform 1, a lifting mechanism 6 between the support platform 1 and the top plate 4, an annular visual inspection mechanism 7 driven on the lifting mechanism 6, and a synchronous driving mechanism 8 between the annular air blowing mechanism 5 and the annular visual inspection mechanism 7. The annular air blowing mechanism 5 includes a drive gear ring 501, which serves as a rotating base and drives the entire air blowing assembly to perform annular rotational motion. The drive gear ring 501 is rotatably mounted inside the support platform 1 around the placement platform 2 via bearings. A drive gear 502 is located at the rear of the support platform 1, and the drive gear 502 meshes with and drives the gear ring 501 to rotate. A synchronous top ring 503 is fixedly mounted on the top of the drive gear ring 501, extending to the top of the support platform 1. 03 Transmits rotational torque to ensure synchronous operation of the upper air blowing component and the gear ring; the top of the synchronous top ring 503 is provided with a mounting plate 504, which provides an installation platform for the air blowing execution component; the mounting plate 504 is provided with a lifting air blowing head 505, which can adjust the air blowing height and angle to clean impurities in different positions of the mold; a non-interference air supply mechanism 506 is provided below the placement table 2, which continuously delivers airflow during the rotation of the component, while avoiding the problem of pipe entanglement; The lifting air head 505 includes a corrugated telescopic tube 5051, which can extend and retract with the lifting action to ensure continuous airflow. The corrugated telescopic tube 5051 is located on the top of the mounting plate 504. Telescopic cylinders 5052 are provided on both sides of the mounting plate 504, which provide lifting power to adjust the height of the air blowing component. The top of each pair of telescopic cylinders 5052 is connected to a mounting frame 5053, which is used to fix the nozzle component. A trumpet-shaped nozzle 5054 is provided inside the mounting frame 5053, which expands the vertical air blowing range and makes the dust removal effect more uniform. One end of the trumpet-shaped nozzle 5054 is connected to the top of the corrugated telescopic tube 5051, and the bottom end of the corrugated telescopic tube 5051 is connected to the pipeline of the non-interference air supply mechanism 506. The airflow is sprayed out from the trumpet-shaped nozzle 5054 to complete the dust removal operation. The interference-free air supply mechanism 506 includes a single-channel pneumatic slip ring 5061, which facilitates the air path transfer between the static pipeline and the rotating component, preventing the pipeline from twisting and tangling. A support column 5062 is provided at the bottom of the placement platform 2, providing stable support for the platform 2. A movable chamber 5063 is provided within the support platform 1 corresponding to the placement platform 2, providing space for the installation and movement of the slip ring and pipeline. The support column 5062 is connected to the bottom of the movable chamber 5063, and the single-channel pneumatic slip ring 5061 is located within the movable chamber. Inside chamber 5063, a single-channel pneumatic slip ring 5061 is fitted around the outer periphery of support column 5062; the rotating end of the single-channel pneumatic slip ring 5061 is connected to an air supply pipe 5064, which passes through synchronous top ring 503 and mounting plate 504, and is connected to the bottom end of corrugated telescopic pipe 5051. The rotating end rotates synchronously with the air blowing assembly to stably deliver airflow; the fixed end of the single-channel pneumatic slip ring 5061 is provided with an air inlet pipe 5065, which is connected to an external air supply device, and the fixed end is connected to an external air source to ensure continuous air supply; The lifting mechanism 6 includes a guide rod 601 and a drive screw 602. The guide rod 601 provides vertical guidance, and the drive screw 602 achieves lifting drive through threaded transmission. The guide rod 601 and the drive screw 602 are respectively arranged on both sides of the support platform 1. A drive motor 603 is provided on one side of the support platform 1 corresponding to the drive screw 602. The drive motor 603 provides power for the lifting action. The output end of the drive motor 603 is connected to a gear reducer 604. The gear reducer 604 reduces the speed and increases the torque, thereby improving the stability of the lifting operation. The output end of the gear reducer 604 is drivenly connected to the bottom end of the drive screw 602. The top end of the guide rod 601 is connected to the top plate 4, and the top end of the drive screw 602 is also connected to the top plate 4. A connecting frame 605 is slidably arranged on the guide rod 601, and a connecting frame 606 is threadedly connected to the drive screw 602. The ring-shaped visual inspection mechanism 7 includes a mounting ring 701, which serves as the main mounting frame for the ring-shaped inspection component. Both sides of the mounting ring 701 are connected to connecting frame one 605 and connecting frame two 606, respectively, and move synchronously with the lifting mechanism. A second drive gear ring 702 is rotatably mounted inside the mounting ring 701 via bearings. A second drive gear 703 is rotatably mounted inside the mounting ring 701 corresponding to the second drive gear ring 702. The second drive gear ring 702 meshes with the second drive gear 703, which drives the second drive gear ring 702 to rotate in a ring. A synchronous inner ring 704 is located on the inner side of the second drive gear ring 702, extending to the inner side of the mounting ring 701. The synchronous inner ring 704 rotates synchronously with the gear ring, carrying the inspection component for circumferential scanning. An adjustable visual inspection head 705 is located on the inner side of the synchronous inner ring 704 corresponding to the lifting air head 505. The adjustable visual inspection head 705 acquires mold images to complete the identification and inspection of appearance defects. The adjustable visual inspection head 705 includes a mounting bracket 7051, which securely connects the inspection component to the inner synchronization ring 704. The mounting bracket 7051 is connected to the inner synchronization ring 704, and a visual inspection head 7052 is rotatably mounted on the mounting bracket 7051. The visual inspection head 7052 is the core component for image acquisition. A control motor 7053 is located on one side of the mounting bracket 7051. The output of the control motor 7053 is connected to the visual inspection head 7052, driving the visual inspection head 7052 to tilt and rotate, adjusting the shooting angle to achieve multi-angle comprehensive inspection. The synchronous drive mechanism 8 includes a splined shaft 801, which can transmit torque while adapting to lifting and lowering displacement to achieve synchronous power output. The splined shaft 801 is rotatably mounted inside the support platform 1. Splined bearing sleeves 802 are installed on the top and bottom of the drive gear 502, and the drive gear 502 has a spline groove corresponding to the splined shaft 801. The top of the drive gear 703 is equipped with a splined bearing sleeve 803, and the drive gear 703 has a spline groove corresponding to the splined shaft 801. The splined bearing sleeves 802 and 803 cooperate with the spline grooves to ensure... Power is reliably transmitted; the spline shaft 801 passes through the first spline bearing sleeve 802, the first drive gear 502, the second spline bearing sleeve 803, and the second drive gear 703 in sequence and is rotatably connected to the top plate 4; the bottom of the support platform 1 is equipped with a second drive motor 804 corresponding to the spline shaft 801, and the second drive motor 804 provides the total power for the entire synchronous rotary mechanism; the output end of the second drive motor 804 is connected to a second gear reducer 805, and the output end of the second gear reducer 805 is driven to the bottom end of the spline shaft 801. After reduction, it drives the spline shaft 801 to rotate, synchronously driving the upper and lower sets of gears and gear rings to rotate; The bottom of the mounting ring 701 is equipped with several supplementary lights 9. The supplementary lights 9 provide additional light sources for the visual inspection area, improve image clarity, and ensure the accuracy of defect identification.

[0022] In actual use, the precision mold to be tested is first hoisted smoothly to the center of the placement platform 2 above the support platform 1. The placement posture is adjusted according to the mold's shape and size to ensure that the bottom of the mold is completely in contact with the surface of the placement platform 2, thus avoiding shaking during the testing process. The second drive motor 804 of the synchronous drive mechanism 8 is started. The power is reduced and amplified by the second gear reducer 805 and then transmitted to the spline shaft 801, causing the spline shaft 801 to rotate at a constant speed. Since the spline shaft 801 is precisely engaged with the first drive gear 502 and the second drive gear 703 through the spline groove, and the first drive gear 502 meshes with the first drive gear ring 501 and the second drive gear 703 meshes with the second drive gear ring 702, the spline shaft 801 synchronously drives the two sets of gear mechanisms to operate: the first drive gear ring 501 drives the top synchronous top ring 503, the mounting plate 504 and the lifting air head 505 to rotate around the placement platform 2 in a ring; at the same time, the second drive gear ring 702 drives the synchronous inner ring 704 and the adjustable vision inspection head 705 to rotate synchronously. When the lifting air head 505 and the adjustable vision inspection head 705 are precisely aligned with the first area to be inspected on the mold (such as a certain quadrant position on the outer ring of the mold), the control system receives the position signal, the second drive motor 804 stops running, and the ring position pre-adjustment is completed. The drive motor 603 of the lifting mechanism 6 is activated. After the transmission ratio is optimized by the gear reducer 604, the motor output drives the drive screw 602 to rotate clockwise. Since the connecting frame 606 is threadedly connected to the drive screw 602, and the connecting frame 605 is slidably engaged with the guide rod 601, under the dual action of screw transmission and guide limit, the connecting frame 605 and the connecting frame 606 drive the ring-shaped vision inspection mechanism 7 to descend smoothly. The operator observes the distance between the vision inspection head 7052 and the mold surface through the equipment control panel. When the distance reaches the preset inspection height (usually 5-15cm, suitable for clear imaging requirements), the drive motor 603 is turned off, and the drive screw 602 self-locks to the current height to prevent displacement during the inspection process. For the area to be inspected, the telescopic cylinders 5052 on both sides of the lifting air head 505 are activated. The piston rods of the telescopic cylinders 5052 extend synchronously, pushing the mounting frame 5053 and the trumpet-shaped nozzle 5054 vertically upward. The corrugated telescopic tube 5051 is stretched and deformed accordingly until the distance between the lower end of the trumpet-shaped nozzle 5054 and the mold surface is adjusted to the optimal blowing height of 3-8cm. Then, the external air supply equipment (such as a high-pressure air pump) is activated. Compressed air enters the fixed end of the single-channel pneumatic slip ring 5061 through the air inlet pipe 5065, is delivered to the air supply pipe 5064 at the rotating end through the internal air passage of the slip ring, and is then guided by the corrugated telescopic tube 5051, finally being ejected from the trumpet-shaped nozzle 5054 in the form of high-pressure airflow to directionally blow away oil, metal scraps, dust and other impurities on the mold surface. Since the single-channel pneumatic slip ring 5061 is sleeved on the outer circumference of the support column 5062, the air path can be connected without interference in the rotating state, ensuring the stability of the blowing process. After the purging continues for 3-5 seconds, the impurities are completely removed, the piston rod of the telescopic cylinder 5052 retracts, driving the trumpet-shaped nozzle 5054 and the corrugated telescopic tube 5051 to return to their initial height, so as to avoid interfering with subsequent visual inspection. The control motor 7053 of the adjustable vision inspection head 705 is activated. The motor output drives the vision inspection head 7052 to rotate around the mounting bracket 7051, precisely adjusting the shooting tilt angle so that the lens is vertically aligned with the cleaned mold surface (if it is necessary to inspect the sides or corners of the mold, it can be adjusted to a tilt angle). Then, the ring-shaped supplementary light 9 at the bottom of the mounting ring 701 is turned on. The supplementary light emits uniform and soft light, eliminating shadows on the mold surface and improving image contrast. The vision inspection head 7052 starts the image acquisition function, quickly capturing a high-definition image of the area and transmitting the image data to the background processing system in real time. The system automatically identifies appearance defects such as scratches, dents, bumps, and color differences through a preset algorithm, marks the defect location and size, and generates inspection data.

[0023] If there are still other uninspected areas in the mold, the above steps can be repeated, either individually or in combination. The synchronous drive mechanism 8 drives the air blowing and inspection components to rotate to the next inspection position. The lifting mechanism 6 finely adjusts the height (if necessary), the lifting air head 505 blows away impurities, and the adjustable vision inspection head 705 collects images and identifies defects until the full coverage inspection of the entire circumference and surface of the mold is completed.

[0024] After all inspection procedures are completed, the external air supply equipment, supplementary light 9 and each drive motor are turned off in sequence. The lifting mechanism drives the circular vision inspection mechanism 7 to rise back to the initial height, and the synchronous drive mechanism 8 is reset. The operator removes the inspected mold from the placement table 2 and can then place the next mold to be inspected to start a new round of inspection process.

[0025] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A visual inspection device and method for detecting appearance defects in precision molds, characterized in that: It includes a support platform (1), a placement platform (2) on the support platform (1), a support frame (3) on the support platform (1), a top plate (4) on the top of the support frame (3), an annular air blowing mechanism (5) inside the support platform (1), a lifting mechanism (6) between the support platform (1) and the top plate (4), an annular visual inspection mechanism (7) driven on the lifting mechanism (6), and a synchronous drive mechanism (8) between the annular air blowing mechanism (5) and the annular visual inspection mechanism (7).

2. The visual inspection equipment and method for detecting appearance defects in precision molds according to claim 1, characterized in that: The annular air blowing mechanism (5) includes a drive gear ring (501), which is rotatably mounted in the support platform (1) around the placement platform (2) via a bearing. A drive gear (502) is provided at the rear of the support platform (1). A synchronous top ring (503) is fixedly mounted on the top of the drive gear ring (501). The synchronous top ring (503) extends to the top of the support platform (1). A mounting plate (504) is provided on the top of the synchronous top ring (503). A lifting air blowing head (505) is provided on the mounting plate (504). An interference-free air supply mechanism (506) is provided below the placement platform (2).

3. The visual inspection equipment and method for detecting appearance defects in precision molds according to claim 2, characterized in that: The lifting air blowing head (505) includes a corrugated telescopic tube (5051), which is located on the top of the mounting plate (504). Telescopic cylinders (5052) are provided on both sides of the mounting plate (504) of the corrugated telescopic tube (5051). A mounting frame (5053) is connected to the top of each pair of telescopic cylinders (5052). A horn-shaped nozzle (5054) is provided inside the mounting frame (5053). One end of the horn-shaped nozzle (5054) is connected to the top of the corrugated telescopic tube (5051), and the bottom end of the corrugated telescopic tube (5051) is connected to the pipeline of the non-interference air supply mechanism (506).

4. The visual inspection equipment and method for detecting appearance defects in precision molds according to claim 3, characterized in that: The interference-free gas supply mechanism (506) includes a single-channel pneumatic slip ring (5061). The bottom of the placement platform (2) is provided with a support column (5062). The support platform (1) is provided with a movable chamber (5063) corresponding to the placement platform (2). The support column (5062) is connected to the bottom of the movable chamber (5063). The single-channel pneumatic slip ring (5061) is located in the movable chamber (5063). The single-channel pneumatic slip ring (5061) is sleeved on the outer periphery of the support column (5062). The rotating end of the single-channel pneumatic slip ring (5061) is connected to an air supply pipe (5064). The air supply pipe (5064) passes through the synchronous top ring (503) and the mounting plate (504) and is connected to the bottom end of the corrugated telescopic pipe (5051). The fixed end of the single-channel pneumatic slip ring (5061) is provided with an air inlet pipe (5065). The air inlet pipe (5065) is connected to an external air supply device.

5. The visual inspection equipment and method for detecting appearance defects in precision molds according to claim 4, characterized in that: The lifting mechanism (6) includes a guide rod (601) and a drive screw (602). The guide rod (601) and the drive screw (602) are respectively arranged on both sides of the support platform (1). A drive motor (603) is provided on one side of the support platform (1) corresponding to the drive screw (602). The output end of the drive motor (603) is connected to a gear reducer (604). The output end of the gear reducer (604) is driven to the bottom end of the drive screw (602). The top end of the guide rod (601) is connected to the top plate (4). The top end of the drive screw (602) is connected to the top plate (4). A connecting frame (605) is slidably arranged on the guide rod (601). A connecting frame (606) is threadedly connected to the drive screw (602).

6. The visual inspection equipment and method for detecting appearance defects in precision molds according to claim 5, characterized in that: The annular visual inspection mechanism (7) includes a mounting ring (701). The two sides of the mounting ring (701) are connected to the first connecting frame (605) and the second connecting frame (606) respectively. A second driving gear ring (702) is rotatably arranged in the mounting ring (701) through a bearing. A second driving gear (703) is rotatably arranged in the mounting ring (701) corresponding to the second driving gear ring (702). The second driving gear ring (702) meshes with the second driving gear (703). A synchronous inner ring (704) is provided on the inner side of the second driving gear ring (702). The synchronous inner ring (704) extends to the inner side of the mounting ring (701). An adjustable visual inspection head (705) is provided on the inner side of the synchronous inner ring (704) corresponding to the lifting air blowing head (505).

7. The visual inspection equipment and method for detecting appearance defects in precision molds according to claim 6, characterized in that: The adjustable vision inspection head (705) includes a mounting bracket (7051), which is connected to the synchronous inner ring (704). A vision inspection head (7052) is rotatably mounted on the mounting bracket (7051). A control motor (7053) is provided on one side of the mounting bracket (7051), and the output end of the control motor (7053) is connected to the vision inspection head (7052).

8. The visual inspection equipment and method for detecting appearance defects in precision molds according to claim 1, characterized in that: The synchronous drive mechanism (8) includes a spline shaft (801), which is rotatably mounted inside the support platform (1). A spline bearing sleeve (802) is installed at both the top and bottom of the first drive gear (502). A spline groove corresponding to the spline shaft (801) is formed on the first drive gear (502). A spline bearing sleeve (803) is installed at the top of the second drive gear (703), and a spline groove corresponding to the spline shaft (801) is formed on the second drive gear (703). Second, the spline shaft (801) passes through the first spline bearing sleeve (802), the first drive gear (502), the second spline bearing sleeve (803), and the second drive gear (703) in sequence and is rotatably connected to the top plate (4). The bottom of the support platform (1) is provided with a second drive motor (804) corresponding to the spline shaft (801). The output end of the second drive motor (804) is connected to a second gear reducer (805). The output end of the second gear reducer (805) is drivenly connected to the bottom end of the spline shaft (801).

9. The visual inspection equipment and method for detecting appearance defects in precision molds according to claim 1, characterized in that: The bottom of the mounting ring (701) is provided with several supplementary lights (9).

10. A visual inspection device and method for detecting appearance defects in precision molds according to any one of claims 1-9, comprising the following steps:

1. Mold placement and positioning: Place the precision mold to be tested stably on the placement table (2) to complete the positioning, check the initial state of each mechanism, and confirm that the air and electrical circuits are connected normally.

2. Pre-adjust the ring position, start the second drive motor (804), drive the spline shaft (801) to rotate via the second gear reducer (805), the spline shaft (801) synchronously drives the first drive gear (502) and the second drive gear (703) to rotate, respectively driving the first drive gear ring (501) and the second drive gear ring (702) to rotate, so that the lifting air head (505) of the ring air blowing mechanism (5) and the adjustable vision inspection head (705) of the ring vision inspection mechanism (7) rotate synchronously to the target position on the surface of the mold to be inspected and then stop.

3. Visual inspection height adjustment: Start the drive motor (603) to drive the drive screw (602) to rotate, and with the guide rod (601) drive the connecting frame (605) and connecting frame (606) to descend, and then stop the ring visual inspection mechanism (7) after adjusting it to the appropriate height of the corresponding mold to be inspected position; IV. Air blowing height adjustment and purging: The telescopic cylinder (5052) drives the corrugated telescopic tube (5051) and the trumpet-shaped nozzle (5054) to move vertically, and adjust the lifting air head (505) to the appropriate air blowing height of the position to be tested; start the external air supply equipment, and the airflow passes through the air inlet pipe (5065), the single-channel pneumatic slip ring (5061), the air supply pipe (5064), and the corrugated telescopic tube (5051) and is sprayed out from the trumpet-shaped nozzle (5054) to perform high-pressure purging of oil and waste at this position; after the purging is completed, the telescopic cylinder (5052) drives the lifting air head (505) to retract and reset; V. Visual inspection angle adjustment and acquisition: Start the control motor (7053) to drive the visual inspection head (7052) to rotate, adjust the shooting angle to align with the surface of the blown mold; turn on the supplementary light (9) at the bottom of the mounting ring (701) to supplement the light, and the visual inspection head (7052) acquires images of the surface of the blown mold to identify appearance defects such as scratches and pits; if other positions need to be inspected, steps two to five can be repeated, or the position of the ring mechanism or the height of the visual inspection mechanism can be adjusted separately according to the actual working conditions until the full surface inspection of the mold is completed.

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