An online quality inspection device for the production process of breathable caps

Abstract

This invention discloses an online quality inspection device for the production process of breathable caps, belonging to the field of breathable cap inspection technology. It includes a conveying mechanism for transporting breathable caps and an inspection mechanism for inspecting the quality of the caps. The inspection mechanism includes a frame with an upper cylinder and a lower cylinder coaxially arranged opposite each other on the inner side of the frame. Annular airbags are installed on the outer sides of the adjacent ends of the upper and lower cylinders. An upper inspection chamber is formed inside the upper cylinder. An air inlet valve for introducing positive pressure inspection gas and a negative pressure valve for extracting negative pressure are respectively connected to the sidewall of the upper cylinder. Compared with the prior art, this invention has the following advantages: by adopting a double-airbag sidewall sealing structure, it avoids contact with the breathable diaphragm, preventing inspection damage and ensuring uniform sealing, thus improving inspection accuracy; simultaneously, it integrates positive and negative pressure air paths with corresponding optical detection arrays, enabling simultaneous completion of four core inspections; and it identifies welding defects by the difference in light transmittance between positive and negative pressure, significantly reducing the false negative rate and significantly improving inspection efficiency.

Description

Technical Field

[0001] This invention relates to the field of breathable cap testing technology, specifically to an online quality testing device for the production process of breathable caps. Background Technology

[0002] A vent cap, also known as a waterproof vent valve, consists primarily of an expanded polytetrafluoroethylene (ePTFE) diaphragm welded to a plastic shell. It achieves high levels of waterproofing and dustproofing while balancing the pressure difference between the inside and outside of the equipment, preventing shell deformation, seal failure, and internal condensation caused by temperature changes. It is widely used in automotive electronics, new energy batteries, photovoltaic inverters, and outdoor communication equipment. With the rapid development of these industries, the market demand for vent caps continues to grow, placing extremely stringent requirements on their quality and reliability. Any minor diaphragm damage, blockage, or welding defect can lead to water ingress and equipment failure, causing significant economic losses and safety hazards.

[0003] Currently, the quality inspection of breathable caps generally adopts the method of physical hard pressing of the breathable cap diaphragm through random sampling. However, the breathable diaphragm is extremely thin and brittle, and hard pressing can easily cause micro-damage to the diaphragm. At the same time, the differences between different products will lead to inconsistent pressure requirements, resulting in poor inspection results. In particular, for well-hidden welding defects, existing technology can only verify them through offline destructive sampling. It can only identify obvious damage to the diaphragm and cannot distinguish between defects in the diaphragm itself and defects in the welding area. The problem of missed detection is prominent and the inspection efficiency is low.

[0004] To address the aforementioned issues, this application proposes an online quality inspection device for the production process of breathable caps. Summary of the Invention

[0005] Based on the aforementioned problems in the existing technology, the problem to be solved by the present invention is to provide an online quality inspection device for the production process of breathable caps. By adopting a double airbag sidewall sealing structure, it avoids contact with the breathable membrane, prevents inspection damage, and ensures uniform sealing, thereby improving inspection accuracy. At the same time, it integrates positive and negative pressure air paths and corresponding optical detection arrays, which can simultaneously complete four core inspections. By identifying welding defects through the difference in light transmittance between positive and negative pressure, it significantly reduces the missed detection rate and significantly improves inspection efficiency, thus solving the problems mentioned in the background technology.

[0006] The technical solution adopted by this invention to solve its technical problem is: An online quality inspection device for the production process of breathable caps includes a conveying mechanism for conveying breathable caps and an inspection mechanism for inspecting the quality of breathable caps. The inspection mechanism includes a frame, with an upper cylinder and a lower cylinder coaxially arranged opposite each other on the inner side of the frame. Annular airbags are installed on the outer sides of the adjacent ends of the upper and lower cylinders. An upper inspection chamber is formed inside the upper cylinder, and an inlet valve for introducing positive pressure inspection gas and a negative pressure valve for extracting negative pressure are respectively connected to the sidewall of the upper cylinder. A light source array is arranged above the upper inspection chamber. A lower inspection chamber is formed inside the lower cylinder, and a photoelectric receiving array corresponding to the light source array is arranged at the bottom of the lower inspection chamber. A one-way outlet valve is connected to the sidewall of the lower cylinder, and a flow sensor is installed on the one-way outlet valve. A synchronous motion component is provided inside the frame to drive the upper and lower cylinders to move synchronously in opposite directions along the vertical direction.

[0007] Furthermore, a synchronous solenoid valve with one inlet and two outlets is provided on one side of the frame. The air inlet of the synchronous solenoid valve is connected to an external air source, and the two air outlets are respectively connected to two sets of annular airbags through connecting hoses.

[0008] Furthermore, a first inner plate is fixed to the top of the upper detection cavity, the light source array is installed below the first inner plate, and a light-transmitting glass fixedly connected to the inner wall of the upper detection cavity is provided below the first inner plate; a second inner plate is fixed to the bottom of the lower detection cavity, the photoelectric receiving array is installed above the second inner plate, and the openings of the upper cylinder and the lower cylinder are arranged opposite to each other.

[0009] Furthermore, the light source array consists of multiple light-emitting lamps evenly distributed along the circumference, and the photoelectric receiving array consists of photoelectric sensors that are equal in number to the number of light-emitting lamps, correspond one-to-one in position, and are coaxially aligned.

[0010] Furthermore, the synchronous motion assembly includes an electric push rod, a fixed plate, a rack, and a linkage gear; a set of fixed plates are respectively installed at the top of the upper cylinder and the bottom of the lower cylinder; the electric push rod is fixedly installed on the top of the vertical frame, and its telescopic end is connected to the fixed plate connected to the upper cylinder; a set of racks is respectively connected to the rear side of the two sets of fixed plates; a linkage gear meshes between the two sets of racks; a guide frame is fixedly installed inside the vertical frame; the guide frame is slidably connected to the upper and lower fixed plates; a fixed rod is fixedly installed on one side of the middle of the guide frame; and the linkage gear is rotatably installed at the rear end of the fixed rod.

[0011] Furthermore, the conveying mechanism includes a circular switching platform, a support, and a stepper motor; the support is located on one side of the upright frame, the switching platform is rotatably mounted on the top of the support, and the stepper motor is fixedly mounted inside the support, with its output shaft fixedly connected to the center of the switching platform; multiple clamping assemblies are evenly arranged circumferentially on the upper surface of the switching platform.

[0012] Furthermore, the clamping assembly includes a drive box, a drive motor, two synchronous gears, and two clamping rods. The drive box is fixed to the upper surface of the switching table. The two synchronous gears are meshed inside the drive box. A rotating shaft is installed at the center of each synchronous gear. Both ends of the rotating shaft pass through the drive box and are rotatably connected to it. The rear ends of the two clamping rods are fixedly connected to the rotating shafts of the two synchronous gears, respectively. Rubber anti-slip pads are provided on opposite sides of the two clamping rods. The drive motor is fixed to the top of the drive box, and its output shaft is fixedly connected to the rotating shaft of one of the synchronous gears.

[0013] Furthermore, the lower end of the frame is fixedly connected to a base via a connecting block, and one end of the base is fixedly connected to a support.

[0014] Furthermore, a touch screen controller is installed on the upper side of the frame. The touch screen controller is electrically connected to the drive motor, stepper motor, light source array, photoelectric receiver array, electric push rod, flow sensor, and synchronous solenoid valve.

[0015] Beneficial effects The beneficial effects of this invention are: 1. This invention adopts a double-airbag sidewall sealing structure. After the annular airbags on the outer sides of the upper and lower cylinder ends are inflated, they only adhere to the inner sidewalls of the upper and lower ends of the vent cap, and have no contact with the internal vent membrane. This avoids micro-damage to the membrane during the testing process and effectively improves the product yield. At the same time, the airbag seal can adapt to the inner wall size deviation of different products and is not affected by the size of the vent cap, which significantly improves the sealing performance and improves the accuracy of the test.

[0016] 2. This invention integrates positive and negative pressure air paths and a light source array in the upper cylinder, and integrates a corresponding photoelectric receiving array and a flow sensor in the lower cylinder. This enables the simultaneous detection of core indicators such as air permeability, sealing performance, diaphragm light transmission defects, and welding defects. In particular, by utilizing the deformation characteristics of the diaphragm when switching between positive and negative pressure, and by comparing the difference in light transmittance under positive and negative pressure conditions in the same area, it is possible to distinguish between defects in the diaphragm itself and welding defects in the welding area. This eliminates the need for offline destructive sampling inspection, reduces the missed detection rate of defective products, and significantly improves detection efficiency.

[0017] 3. The present invention uses the clamping assembly of the conveying mechanism to clamp only the outer wall of the vent cap, and cooperates with the circular switching table driven by the stepper motor to perform fixed-angle indexing movement, which can realize the continuous conveying and classified discharge of products.

[0018] 4. This invention drives the upper cylinder to move via an electric push rod, while simultaneously driving the lower cylinder to move in the opposite direction via meshing racks and linkage gears. This allows the upper and lower cylinders to extend into the vent cap simultaneously, avoiding coaxiality deviation and ensuring uniform sealing and accurate alignment of the detection optical path, thereby improving the stability and reliability of the detection process. Attached Figure Description

[0019] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a structural schematic diagram from another perspective of the present invention; Figure 3 for Figure 2 A magnified structural diagram of part A; Figure 4 This is a top view of the clamping assembly in this invention. Figure 5 This is a schematic diagram of the detection mechanism in this invention; Figure 6 for Figure 5 A schematic diagram of the enlarged structure of part B; Figure 7 This is a schematic diagram of the structure of the upper cylinder in cross-section of the present invention; Figure 8 This is a schematic diagram of the upper cylinder's cross-sectional view from below in this invention; Figure 9 This is a top view of the lower cylinder structure in this invention; In the diagram, 1. Detection mechanism; 11. Vertical frame; 12. Touch screen controller; 13. Electric push rod; 14. Upper cylinder; 15. Synchronous solenoid valve; 16. Lower cylinder; 17. Fixing plate; 18. Rack; 19. Guide frame; 110. One-way exhaust valve; 111. Linkage gear; 112. Fixing rod; 113. Annular airbag; 114. Transparent glass; 115. First inner plate; 116. Inlet valve; 117. Negative pressure valve; 118. Light source array; 119. Second inner plate; 120. Photoelectric receiving array; 2. Conveying mechanism; 21. Switching table; 22. Clamping assembly; 221. Drive box; 222. Drive motor; 223. Clamping rod; 224. Synchronous gear; 23. Support; 3. Base. 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 Figures 1-9 As shown, an online quality inspection device for the production process of breathable caps includes a conveying mechanism 2 for conveying breathable caps and an inspection mechanism 1 for inspecting the quality of breathable caps. The inspection mechanism 1 includes a frame 11, with an upper cylinder 14 and a lower cylinder 16 coaxially arranged opposite each other on the inner side of the frame 11. Annular airbags 113 are installed on the outer sides of the adjacent ends of the upper cylinder 14 and the lower cylinder 16. An upper inspection chamber is formed inside the upper cylinder 14, and air inlet valves for introducing positive pressure inspection gas are connected to the side walls of the upper cylinder 14. 116 and a negative pressure valve 117 for extracting negative pressure are provided. A light source array 118 is arranged above the upper detection chamber. A lower detection chamber is formed inside the lower cylinder 16. A photoelectric receiving array 120 corresponding to the light source array 118 is arranged at the bottom of the lower detection chamber. A one-way air outlet valve 110 is connected to the side wall of the lower cylinder 16. A flow sensor is installed on the one-way air outlet valve 110. A synchronous motion component is provided inside the upright frame 11 to drive the upper cylinder 14 and the lower cylinder 16 to move synchronously in opposite directions in the vertical direction.

[0022] like Figures 1-2 As shown, a synchronous solenoid valve 15 with one inlet and two outlets is provided on one side of the frame 11. The air inlet of the synchronous solenoid valve 15 is connected to an external air source, and the two air outlets are respectively connected to two sets of annular airbags 113 through connecting hoses. The synchronous solenoid valve 15 with one inlet and two outlets realizes the synchronous inflation and deflation of the two sets of annular airbags 113, ensuring that the upper and lower sealing pressures are completely consistent, and ensuring the uniformity and reliability of the seal.

[0023] like Figure 5 , Figure 7 , Figure 8 as well as Figure 9 As shown, a first inner plate 115 is fixed to the top of the upper detection cavity, and a light source array 118 is installed below the first inner plate 115. A light-transmitting glass 114 is fixedly connected to the inner wall of the upper detection cavity below the first inner plate 115, and the light source emitted by the light source array 118 can shine downward through the light-transmitting glass 114. A second inner plate 119 is fixed to the bottom of the lower detection cavity, and a photoelectric receiving array 120 is installed above the second inner plate 119. The openings of the upper cylinder 14 and the lower cylinder 16 are arranged opposite to each other, so that the breathable diaphragm can be completely within the effective range of the detection light path and the air path.

[0024] like Figures 7-9As shown, the light source array 118 consists of multiple light-emitting lamps evenly distributed along the circumference, and the photoelectric receiving array 120 consists of photoelectric sensors that are equal in number to the number of light-emitting lamps, correspond one-to-one in position, and are coaxially aligned. The light-emitting lamps evenly distributed along the circumference can provide uniform illumination to the entire surface of the breathable membrane and the annular welding area; the one-to-one corresponding and coaxially aligned photoelectric sensors can accurately receive the transmitted light in the corresponding area, avoid cross-interference of light rays, and improve the accuracy and resolution of transmittance detection.

[0025] like Figure 1 , Figure 2 , Figure 5 as well as Figure 6 As shown, the synchronous motion assembly includes an electric push rod 13, a fixed plate 17, a rack 18, and a linkage gear 111; a set of fixed plates 17 are respectively installed at the top of the upper cylinder 14 and the bottom of the lower cylinder 16; the electric push rod 13 is fixedly installed on the top of the vertical frame 11, and its telescopic end is connected to the fixed plate 17 connected to the upper cylinder 14; a set of racks 18 are respectively connected to the rear side of the two sets of fixed plates 17, and the linkage gear 111 meshes between the two sets of racks 18; a guide frame 19 is fixedly installed on the inner side of the vertical frame 11, and the guide frame 19 is slidably connected to the upper and lower sets of fixed plates 17. A fixed rod 112 is fixedly installed on one side of the middle of the guide frame 19. The linkage gear 111 is rotatably installed at the rear end of the fixed rod 112. The electric push rod 13 provides the power for the movement of the upper cylinder 14 and the lower cylinder 16. The linkage gear 111 meshes with two sets of racks 18 to realize the synchronous movement of the upper cylinder 14 and the lower cylinder 16. Only one power source is needed to complete the bidirectional drive. The structure is simple and the synchronization is good. The guide frame 19 provides vertical guidance for the upper and lower fixed plates 17 to prevent the upper cylinder 14 and the lower cylinder 16 from radially offset during the movement and to ensure coaxiality.

[0026] like Figures 1-4 As shown, the conveying mechanism 2 includes a circular switching table 21, a support 23, and a stepper motor. The support 23 is located on one side of the upright frame 11. The switching table 21 is rotatably mounted on the top of the support 23. The stepper motor is fixedly mounted inside the support 23, and its output shaft is fixedly connected to the center of the switching table 21. Multiple clamping assemblies 22 are evenly arranged circumferentially on the upper surface of the switching table 21. The stepper motor drives the switching table 21 to perform precise fixed-angle indexing movements to ensure that the products can be conveyed to each workstation.

[0027] like Figures 1-4As shown, the clamping assembly 22 includes a drive box 221, a drive motor 222, two synchronous gears 224, and two clamping rods 223. The drive box 221 is fixed to the upper surface of the switching table 21. The two synchronous gears 224 are meshed inside the drive box 221. A rotating shaft is installed at the center of the synchronous gears 224, and both ends of the rotating shaft pass through the drive box 221 and are rotatably connected to it. The rear ends of the two clamping rods 223 are fixedly connected to the rotating shafts of the two synchronous gears 224, respectively. Rubber anti-slip pads are provided on opposite sides of the two clamping rods 223. The drive motor 222 is fixed to the top of the drive box 221, and its output shaft is fixedly connected to the rotating shaft of one of the synchronous gears 224. The drive motor 222 provides the power for the clamping rods 223 to open and close. The meshing synchronous gears 224 ensure that the two clamping rods 223 move synchronously inward or outward, with uniform clamping force, preventing the vent cap from tilting. The rubber anti-slip pads increase the clamping friction, preventing the vent cap from slipping during transport and avoiding damage to the outer surface of the vent cap.

[0028] like Figures 1-2 As shown, the lower end of the frame 11 is fixedly connected to the base 3 via a connecting block, and one end of the base 3 is fixedly connected to the support 23.

[0029] like Figure 1 , Figure 2 as well as Figure 5 As shown, a touch screen controller 12 is installed on one side of the upper part of the frame 11. The touch screen controller 12 is electrically connected to the drive motor 222, stepper motor, light source array 118, photoelectric receiver array 120, electric push rod 13, flow sensor and synchronous solenoid valve 15. The touch screen controller 12 serves as the central control unit of the entire device, coordinating the timing of the actions of all components, collecting and processing the detection data of the flow sensor and photoelectric receiver array 120, performing product qualification judgment and defect classification, realizing control from feeding, clamping, detection to classified discharge, and facilitating parameter setting by operators.

[0030] Working principle: After the completed breathable caps are fed into the clamping assembly 22 at the loading station by the feeding mechanism in the breathable cap production process, the touch screen controller 12 issues a clamping command, causing the drive motor 222 to rotate forward. Through the synchronous gear 224, the two clamping rods 223 are driven to retract inward synchronously, clamping the outer wall of the breathable cap through the rubber anti-slip pad. Then, the touch screen controller 12 issues an indexing command, controlling the stepper motor to start, driving the circular switching table 21 to rotate and sequentially transport the clamped breathable caps circumferentially to the center of the inspection station between the upper cylinder 14 and the lower cylinder 16. Then, the touch screen controller 12 controls the electric pusher The telescopic end of rod 13 extends downward, driving the upper cylinder 14 to move vertically downward along the guide frame 19. At the same time, through the meshing transmission of rack 18 and linkage gear 111, it drives the lower cylinder 16 to move vertically upward along the guide frame 19 until the upper cylinder 14 and lower cylinder 16 respectively extend into the interior of the upper and lower ends of the vent cap. Then, the touch screen controller 12 issues a sealing command, and the synchronous solenoid valve 15 is energized and opened. The gas from the external low-pressure gas source simultaneously enters the upper and lower annular airbags 113 through two connecting hoses, causing them to expand evenly and fit against the inner sidewalls of the upper and lower ends of the vent cap to form an annular seal. After sealing is completed, the touch screen controller 12 simultaneously issues three detection commands: First, it controls the air inlet valve 116 to open (the air inlet valve 116 can be connected to an external air source to supply air), introducing positive pressure detection gas into the upper detection chamber. The gas passes through the breathable diaphragm into the lower detection chamber, and then exits through the one-way air outlet valve 110 on the side wall of the lower cylinder 16. The flow sensor integrated at the outlet of the one-way air outlet valve 110 collects the gas flow data in real time and transmits it to the touch screen controller 12. The touch screen controller 12 compares the measured flow with the standard threshold to complete the air permeability and sealing performance verification. The sealing performance is determined by two methods: excessive flow indicates leakage, and insufficient flow indicates blockage. Secondly, the light source array 118 is lit up. The light emitted by multiple lights evenly distributed around the circumference passes through the light-transmitting glass 114 and is vertically and evenly irradiated on the entire surface of the breathable membrane and the annular welding area. After passing through the membrane, the light is received by the photoelectric receiving array 120, which is coaxially aligned with the lights at the bottom of the lower detection chamber. The photoelectric sensor converts the light signal into an electrical signal and transmits it to the touch screen controller 12 to collect the light transmittance distribution data of each area of ​​the membrane under positive pressure.

[0031] After the positive pressure test is completed, the touch screen controller 12 sends a negative pressure test command to control the air intake valve 116 to close and the negative pressure valve 117 to open (the negative pressure valve 117 can be connected to an external negative pressure suction device) to draw the upper detection chamber to negative pressure. At this time, the breathable membrane bulges upward under the action of the upper and lower pressure difference. The light source array 118 remains lit. The photoelectric receiving array 120 collects the light transmittance distribution data of each area of ​​the membrane under negative pressure. The controller compares the light transmittance difference of the same area under positive pressure and negative pressure to determine the welding quality. If there is no significant change in the light transmittance, the welding is good. If the light transmittance increases significantly, the welding is poor.

[0032] After all test data is collected, the touch screen controller 12 comprehensively judges the air permeability, sealing performance, diaphragm defects, and welding quality indicators, and generates product qualified / unqualified labels and defect type labels; then it issues a reset command: controls the negative pressure valve 117 to close, the synchronous solenoid valve 15 to be de-energized, and the two sets of annular airbags 113 to simultaneously exhaust and contract to release the seal; controls the electric push rod 13 to retract, driving the upper cylinder 14 to rise and the lower cylinder 16 to simultaneously return to the initial position.

[0033] Finally, the touch screen controller 12 controls the stepper motor to drive the circular switching stage 21 to rotate clockwise by a fixed angle each time, so that the product passes through each pre-assigned station in sequence. When the product reaches the discharge station corresponding to its defect type mark code, the controller sends an unloading command to the clamping component 22 of that station. The drive motor 222 reverses and drives the two clamping rods 223 to open synchronously. Under the action of gravity, the product falls into the corresponding category of material trough: qualified products are unloaded at the qualified product discharge station, and defective products are unloaded at the unqualified product discharge station. The clamping component 22 that has not reached the corresponding discharge station always remains clamped until the product reaches the corresponding station. At the same time, the next vent cap to be inspected is synchronously transported to the inspection station. The device repeats the above process to realize continuous online quality inspection.

[0034] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Moreover, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] 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 variations 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. An online quality inspection device for the production process of breathable caps, characterized in that: It includes a conveying mechanism (2) for conveying breathable caps and a testing mechanism (1) for testing the quality of breathable caps. The detection mechanism (1) includes a frame (11), and an upper cylinder (14) and a lower cylinder (16) are coaxially arranged on the inner side of the frame (11). An annular airbag (113) is installed on the outer side of the upper cylinder (14) and the lower cylinder (16) that are close to each other. The upper cylinder (14) forms an upper detection chamber inside. The side walls of the upper cylinder (14) are respectively connected to an air inlet valve (116) for introducing positive pressure detection gas and a negative pressure valve (117) for extracting negative pressure. A light source array (118) is arranged above the upper detection chamber. The lower cylinder (16) forms a lower detection chamber inside. A photoelectric receiving array (120) corresponding to the light source array (118) is arranged at the bottom of the lower detection chamber. A one-way air outlet valve (110) is connected to the side wall of the lower cylinder (16). A flow sensor is installed on the one-way air outlet valve (110). The inner side of the upright frame (11) is provided with a synchronous motion component, which is used to drive the upper cylinder (14) and the lower cylinder (16) to move synchronously towards each other / away from each other in the vertical direction.

2. The online quality inspection device for the production process of breathable caps according to claim 1, characterized in that, The frame (11) is provided with a synchronous solenoid valve (15) with one inlet and two outlets on one side. The inlet of the synchronous solenoid valve (15) is connected to an external air source, and the two outlets are respectively connected to two sets of annular airbags (113) through connecting hoses.

3. The online quality inspection device for the production process of breathable caps according to claim 2, characterized in that, The top of the upper detection cavity is fixed with a first inner plate (115), the light source array (118) is installed below the first inner plate (115), and a light-transmitting glass (114) is provided below the first inner plate (115) and fixedly connected to the inner wall of the upper detection cavity; the bottom of the lower detection cavity is fixed with a second inner plate (119), the photoelectric receiving array (120) is installed above the second inner plate (119), and the openings of the upper cylinder (14) and the lower cylinder (16) are arranged opposite to each other.

4. The online quality inspection device for the production process of breathable caps according to claim 3, characterized in that, The light source array (118) consists of multiple light-emitting lamps evenly distributed along the circumference, and the photoelectric receiving array (120) consists of photoelectric sensors that are equal in number to the number of light-emitting lamps, correspond one-to-one in position, and are coaxially aligned.

5. The online quality inspection device for the production process of breathable caps according to claim 4, characterized in that, The synchronous motion assembly includes an electric push rod (13), a fixed plate (17), a rack (18), and a linkage gear (111). A set of fixed plates (17) is installed at the top of the upper cylinder (14) and the bottom of the lower cylinder (16). The electric push rod (13) is fixedly installed at the top of the vertical frame (11), and its telescopic end is connected to the fixed plate (17) connected to the upper cylinder (14). A set of racks (18) is connected to the rear side of the two sets of fixed plates (17). A linkage gear (111) meshes between the two sets of racks (18). A guide frame (19) is fixedly installed on the inner side of the vertical frame (11). The guide frame (19) is slidably connected to the upper and lower sets of fixed plates (17). A fixed rod (112) is fixedly installed on one side of the middle of the guide frame (19). The linkage gear (111) is rotatably installed at the rear end of the fixed rod (112).

6. The online quality inspection device for the production process of breathable caps according to claim 5, characterized in that, The conveying mechanism (2) includes a circular switching table (21), a support (23), and a stepper motor; the support (23) is located on one side of the upright frame (11), the switching table (21) is rotatably mounted on the top of the support (23), the stepper motor is fixedly mounted inside the support (23), and its output shaft is fixedly connected to the center of the switching table (21); multiple clamping assemblies (22) are evenly arranged circumferentially on the upper surface of the switching table (21).

7. The online quality inspection device for the production process of breathable caps according to claim 6, characterized in that, The clamping assembly (22) includes a drive box (221), a drive motor (222), two synchronous gears (224), and two clamping rods (223). The drive box (221) is fixed on the upper surface of the switching table (21). The two synchronous gears (224) are meshed with each other and are arranged inside the drive box (221). A rotating shaft is installed at the center of the synchronous gear (224). The two ends of the rotating shaft pass through the drive box (221) and form a rotatable connection with it. The rear ends of the two clamping rods (223) are fixedly connected to the rotating shafts of the two synchronous gears (224), respectively. Rubber anti-slip pads are provided on the opposite side of the two clamping rods (223). The drive motor (222) is fixed on the top of the drive box (221), and its output shaft is fixedly connected to the rotating shaft of one of the synchronous gears (224).

8. The online quality inspection device for the production process of breathable caps according to claim 7, characterized in that, The lower end of the frame (11) is fixedly connected to the base (3) via a connecting block, and one end of the base (3) is fixedly connected to the support (23).

9. The online quality inspection device for the production process of breathable caps according to claim 8, characterized in that, A touch screen controller (12) is installed on the upper side of the frame (11). The touch screen controller (12) is electrically connected to the drive motor (222), stepper motor, light source array (118), photoelectric receiver array (120), electric push rod (13), flow sensor and synchronous solenoid valve (15).

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