A toothbrush head production method with visual detection function

Abstract

The application discloses a toothbrush head production method with visual detection function, the toothbrush head comprises a brush head body, a shock attenuation air bag and a marking element, and the method comprises the following steps: brush head body pretreatment; marking element setting and installation: the marking element is set to comprise an elastic main body area and a plastic marking area, the plastic deformation threshold of the elastic main body area is higher than that of the plastic marking area; the marking element is installed on the inner wall of the air bag mounting cavity; the shock attenuation air bag is inflated to reach a preset internal pressure, and the air bag is mounted in the air bag mounting cavity; factory detection: external pressure is applied to the air bag, the air bag is deformed and synchronously transmitted to the plastic marking area of the marking element, triggering irreversible plastic deformation of the plastic marking area; and the shape of the plastic marking area after deformation is identified and determined through a visual window. The application can realize high detection efficiency without relying on professional electronic detection equipment, and the detection result can be permanently attached to the product in the form of a physical mark.

Description

Technical Field

[0001] This invention relates to the field of quality control in electric toothbrush production, and in particular to a method for producing toothbrush heads with visual inspection capabilities. Background Technology

[0002] The air bladder cushioning layer inside the electric toothbrush head is a core functional component that absorbs high-frequency vibrations and reduces impact on the gums. Its sealing integrity and pre-inflation pressure stability directly determine the user experience and gum protection effect of the toothbrush. If the air bladder has problems such as air leakage or pressure decay, the cushioning function will fail. Therefore, accurate testing of the core performance of the air bladder before leaving the factory is a key quality control step in the production of electric toothbrush heads.

[0003] Currently, the industry's methods for testing airbag performance all rely on specialized electronic and precision equipment such as pressure sensors, sealing testers, and inflation / deflation fixtures. While these methods can obtain quantitative pressure data, they have many inherent shortcomings that make them difficult to adapt to the demands of modern mass production. These shortcomings are as follows:

[0004] The testing efficiency is extremely low and full inspection cannot be achieved: each product needs to complete the processes of precise clamping, pipeline connection, inflation and deflation, pressure monitoring, and data recording in sequence. The entire testing cycle is as long as 30 seconds, which has become a bottleneck for the production capacity of mass production lines. Most companies can only use sampling inspection, which makes it difficult to achieve 100% full inspection and poses a risk of missing quality inspections.

[0005] The test results are abstract, lack traceability, and have no physical evidence: the determination of whether a product is qualified or not relies entirely on the electronic data output by the testing equipment in an instant, without any physical markings attached to the product itself. Once the original test records are lost, it is impossible to directly verify the airbag performance status of the product at the time of manufacture, and the electronic data is at risk of being lost, tampered with, or mismanaged, making quality traceability very difficult.

[0006] The high maintenance costs, coupled with the need for professional operators to interpret electronic data and debug equipment, increase the quality control costs for enterprises and make it unsuitable for small and medium-sized production enterprises.

[0007] Therefore, there is an urgent need to develop an electric toothbrush head that is highly efficient in testing, can achieve full inspection, can physically solidify test results, and is low-cost and adaptable to mass production. Summary of the Invention

[0008] In view of this, the purpose of the present invention is to provide a toothbrush head production method with visual inspection function, which can achieve high inspection efficiency without relying on professional electronic inspection equipment, and the inspection results can be permanently attached to the product in the form of physical marks.

[0009] This invention provides a method for producing a toothbrush head with visual inspection function. The toothbrush head includes a brush head body, a damping airbag, and a marking component. The production method includes:

[0010] S1. Pre-processing of the brush head body: An airbag mounting cavity and a viewing window are provided on the brush head body. The viewing window is used to display the internal structure of the airbag mounting cavity.

[0011] S2. Setting and installation of the identification component: The identification component is set to include an elastic body area and a plastic marking area, wherein the plastic deformation threshold of the elastic body area is higher than the plastic deformation threshold of the plastic marking area; the identification component is installed on the inner wall of the airbag mounting cavity through a viewing window, and it is ensured that there is a gap between the elastic body area and the plastic marking area and the inner wall of the airbag mounting cavity;

[0012] S3. Inflation and installation of the damping airbag: Inflate the damping airbag to the preset internal pressure, install the damping airbag in the airbag installation cavity through the viewing window, and ensure that the marker is within the deformation range of the damping airbag.

[0013] S4. Factory Inspection:

[0014] External pressure is applied to the damping airbag, causing it to deform and simultaneously transmit the deformation to the plastic marking area of ​​the marker, triggering irreversible plastic deformation in the plastic marking area.

[0015] The shape of the plastic marking area after deformation is identified through the visual window;

[0016] If the shape of the deformed plastic marking area falls within the preset range, the toothbrush head is deemed qualified; otherwise, it is deemed unqualified.

[0017] S5. Pack the qualified toothbrush heads.

[0018] As a further improvement to the above technical solution, before step S2, a positioning reference groove is set. The specific steps are as follows: a positioning reference groove is opened in the airbag installation cavity, and in step S2, the marker is placed in the positioning reference groove and fixed in the positioning reference groove by the two ends of the marker.

[0019] As a further improvement to the above technical solution, the marker is fixed in the positioning reference groove by applying a small amount of food-grade hot melt adhesive to the non-deformable core areas at both ends. After fixing, the marker is scanned by a CCD vision inspection system to detect whether the offset of the center line of the marker is within a preset range, so as to ensure that the marker is within the deformation range of the shock-absorbing airbag.

[0020] As a further improvement to the above technical solution, the elastic main body region is a food-grade thermoplastic elastomer with a plastic deformation threshold ≥ 0.12 MPa; the plastic marking region is a modified plasticized thermoplastic elastomer with a plastic deformation threshold of 0.06-0.08 MPa.

[0021] As a further improvement to the above technical solution, the internal pressure of the damping airbag is equal to the external pressure that triggers irreversible plastic deformation in the plastic marking area, and the values ​​of the two range from 0.06 to 0.08 MPa.

[0022] As a further improvement to the above technical solution, the marker is a strip, ring, or dot matrix structure, and its color is a dark color that forms a high contrast with the viewing window and the damping airbag.

[0023] As a further improvement to the above technical solution, the side of the marker facing the damping airbag is provided with an anti-adhesion microstructure.

[0024] As a further improvement to the above technical solution, before step S5, the visible window is sealed. The specific steps are: the visible window is sealed to the brush head body by welding or sealing ring, wherein the visible window is made of food-grade polycarbonate material with high light transmittance and high wear resistance.

[0025] As a further improvement to the above technical solution, the step of identifying the shape of the plastic marking area after deformation in S4 includes: using a camera to capture an image of the marking component, extracting features from the image, and obtaining the shape of the plastic deformation.

[0026] As a further improvement to the above technical solution, the specific steps for packaging qualified toothbrush heads in step S5 include:

[0027] The scratches on the viewing window and the sealing performance of the shock-absorbing airbag are inspected.

[0028] The bristles of qualified toothbrush heads are ground and rounded, and an anti-scratch coating is sprayed onto the surface of the viewing window.

[0029] Qualified toothbrush heads are repackaged, and the batch number, damping airbag inflation pressure, and adhesive content of the labeling parts are marked on the packaging. A complete quality traceability system is established. The irreversible plastic deformation of the labeling parts serves as a self-evident traceability certificate, forming a dual traceability system with the packaging parameters.

[0030] The beneficial effects of this invention are as follows:

[0031] This invention provides a toothbrush head production method with visual inspection function. Through standardized mechanical pressure applied in a single application, precisely matching actual usage conditions, the three core performance parameters of the damping airbag—sealing integrity, pre-inflation pressure stability, and buffer stiffness—are directly converted into the irreversible plastic deformation of the visual inspection marker. Although the materials of the damping airbag and the marker are both elastomers, they have different mechanical response characteristics. Under external pressure, the damping airbag remains within its elastic deformation range and can completely return to its original shape after the pressure is applied; while the stress on the marker exceeds its plastic yield threshold, resulting in irreversible molecular chain rearrangement. With the change in shape, after the pressure is withdrawn, the elastic recovery force of the cushioning airbag is insufficient to "pull back" the plastically deformed marking component to its original position. This achieves the ideal state of "airbag repositioning after pressure and marking component maintaining its shape," allowing the inspection mark to be permanently retained. Once this plastic deformation is formed, it is permanently solidified inside the product body, becoming a unique physical certificate for the cushioning airbag to pass the factory performance test. It does not rely on any electronic records. Subsequently, throughout the entire product life cycle, the shape of the marking component can be directly observed through a transparent viewing window to quickly verify the factory test status of the cushioning airbag, achieving rapid quality traceability without records or equipment.

[0032] Meanwhile, it eliminates the need for specialized electronic testing equipment and complex inflation / deflation and data recording processes. The testing station has a simple structure and low cost, and can be seamlessly integrated into existing production lines. The testing cycle for a single product is reduced to less than 3 seconds, and the testing efficiency is more than 10 times higher than existing technologies, enabling 100% full inspection on mass production lines and completely eliminating the risk of missed quality inspections. Furthermore, it completely replaces miniature pressure sensors, avoiding the problems associated with sensors such as high cost, difficulty in waterproofing and sealing, high power consumption, and frequent malfunctions. It simplifies the internal structure of the brush head, facilitates standardized mass production, and significantly reduces production and maintenance costs. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a flowchart illustrating a toothbrush head production method with visual inspection function, provided as a preferred embodiment of the present invention.

[0035] Figure 2 This is a schematic diagram of the structure of a toothbrush head with a visual detection function (including a partial cross-sectional view of the airbag mounting cavity) provided as a preferred embodiment of the present invention.

[0036] Figure 3 for Figure 2 The left view.

[0037] Figure label:

[0038] 1. Brush head body; 11. Airbag mounting cavity; 111. Positioning reference groove; 2. Vibration damping airbag; 3. Identification component; 31. Elastic main body area; 32. Plastic marking area; 4. Viewing window; 5. Brush bristles. Detailed Implementation

[0039] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. Based on the description of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0040] In the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0041] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of description and simplification, 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. Therefore, they should not be construed as limitations on the present invention.

[0042] The terms “first,” “second,” “third,” etc., are used merely to distinguish elements with similar properties, not to indicate or imply relative importance or a specific order.

[0043] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0044] This invention provides a method for producing toothbrush heads with visual inspection capabilities.

[0045] like Figures 1 to 3 As shown in this embodiment, the toothbrush head manufacturing method with visual detection function includes a brush head body 1, a damping airbag 2, and a marking component 3. The manufacturing method includes:

[0046] S1. Pre-processing of the brush head body: An airbag mounting cavity 11 and a viewing window 4 are set on the brush head body 1. The viewing window 4 is used to display the internal structure of the airbag mounting cavity.

[0047] Specifically, firstly, the brush head body 1 is integrally molded from food-grade PP material using an injection mold. The brush head body 1 is provided with a bristle section 5, and a viewing window 4 is located on the surface of the brush head body 1, opposite to the position of the bristle section 5. The viewing window 4 is connected to the airbag mounting cavity 11, and in addition to showing the internal structure of the airbag mounting cavity 11, it also constitutes the installation entrance of the airbag mounting cavity 11.

[0048] Secondly, a positioning reference groove 111 is directly formed inside the airbag mounting cavity 11 of the brush head body 1. The positioning reference groove 111 preferably has a depth of 0.2 mm and a width of 0.3 mm. It only serves a physical positioning function and is not exposed on the contact surface, providing a precise and concealed installation position for the marking component 3.

[0049] S2. Setting and installation of the marker: The marker 3 is set to include an elastic body area 31 and a plastic marking area 32, and the plastic deformation threshold of the elastic body area 31 is higher than the plastic deformation threshold of the plastic marking area 32; the marker 3 is installed on the inner wall of the airbag mounting cavity 11 through the viewing window 4, and it is ensured that there is a gap between the elastic body area 31 and the plastic marking area 32 and the inner wall of the airbag mounting cavity 11.

[0050] Specifically, the marker 3 adopts a composite structure of a localized plastic marking area 32 and an overall elastic main body area 31. The elastic main body area 31 is made of food-grade thermoplastic elastomer (TPE) with a plastic deformation threshold ≥0.12MPa and an elastic recovery rate ≥95%. The plastic marking area 32 is a modified plasticized TPE layer with a plastic deformation threshold precisely calibrated to 0.06-0.08MPa. The marker 3 is set as a strip shape. Taking an 8mm long × 2mm wide × 0.3mm thick dimension as an example, the plastic marking area 32 is located in the 1mm area at both ends of the marker 3, accounting for ≤15%; the elastic main body area 31 is located in the 6mm area in the center of the marker 3, accounting for ≥85%. The elastic main body area 31 is not modified in any way, maintaining its original high elasticity. The preferred color of the marker 3 is dark gray, which forms a high contrast with the transparent material of the shock-absorbing airbag 2 and the viewing window 4, so that the deformation morphology of the marker 3, especially the plastic marking area 32, can be clearly observed.

[0051] The label 3 is placed into the airbag mounting cavity 11 through the viewing window 4. Using a special positioning fixture, the label 3 is precisely embedded into the positioning reference groove 111 of the brush head body 1. Micro-dispensing adhesive-assisted fixing technology is used, with food-grade hot melt adhesive applied only to the non-deformation core areas at both ends of the label. The amount of adhesive is strictly controlled at 0.01-0.02 grams (preferably 0.015 grams) to prevent the adhesive from overflowing and obscuring the surface of the label 3, and to avoid rigid restraint on the deformation of the shock-absorbing airbag 2. By applying a small amount of food-grade hot melt adhesive to the non-deformation core areas at both ends of the label 3, the label 3 is fixed in the positioning reference groove 111. After fixing, the offset of the center line of the label 3 is scanned by a CCD vision inspection system to detect whether it is within the preset range (e.g., the offset is not greater than 0.05 mm) to ensure that the label 3 is within the deformation range of the shock-absorbing airbag 2.

[0052] After the marker 3 is fixed, there is a gap between the elastic main body area 31 and the plastic marking area 32 and the inner wall of the airbag mounting cavity 11. That is, the marker 3 is fixed at both ends and suspended in the middle, ensuring that the marker 3 can respond freely when the damping airbag 2 deforms. Two positioning reference slots 111 are provided, and one marker 3 is set in each positioning reference slot 111. The two markers 3 are set on adjacent sides of the viewing window 4, so that the two markers 3 can be observed through the viewing window 4.

[0053] S3. Inflation and installation of the damping airbag: Inflate the damping airbag to the preset internal pressure, install the damping airbag 2 in the airbag installation cavity 11 through the viewing window 4, and ensure that the marker 3 is within the deformation range of the damping airbag 2.

[0054] Specifically, a food-grade silicone material is pre-formed into a cushioning airbag 2, and an inert gas (such as nitrogen) is injected into the airbag using an inflation fixture. A pressure monitoring fixture is used to precisely adjust and stabilize the internal pressure of the cushioning airbag at 0.06-0.08 MPa (preferably 0.07 MPa). This pressure value is an engineered intermediate threshold obtained through extensive experimentation, precisely matching the actual impact pressure generated by the high-frequency vibration of mainstream electric toothbrushes (25,000-40,000 times / minute). This ensures both effective cushioning and prevents overload failure of the cushioning airbag 2. The inflated cushioning airbag 2 is then installed within the airbag mounting cavity 11 and partially fixed to ensure that the core deformation area of ​​the cushioning airbag 2 is in a free deformation state.

[0055] After the debugging is completed, the shock-absorbing airbag 2 will be embedded into the airbag mounting cavity 11 through the viewing window 4. By using special tooling to press precisely, the core deformation area of ​​the shock-absorbing airbag 2 will be seamlessly attached to the surface of the fixed marker 3, thus establishing the physical basis for deformation linkage and ensuring that the shock-absorbing airbag can directly and synchronously drive the marker 3 to deform in a consistent manner when it is compressed.

[0056] In this embodiment, the shock-absorbing airbag 2 is pre-inflated and its pressure is stabilized in advance, eliminating the need for an additional pressure sensor. The performance status monitoring function of the sensor in the prior art is replaced by the deformation linkage system of the shock-absorbing airbag 2 and the visual window 4 of the marker 3, and the detection results are physically solidified through the plastic marking area 32 of the marker 3.

[0057] S4. Factory inspection, specifically including:

[0058] S41. Apply external pressure to the damping airbag 2 to cause the damping airbag 2 to deform and transmit the deformation to the plastic marking area 32 of the marking component 3, triggering irreversible plastic deformation of the plastic marking area 32.

[0059] Specifically, the first step is to prepare a constant force pressure device: a constant force spring assembly or a low-stroke cylinder that has been calibrated by measurement is used, and the output end is equipped with a food-grade soft silicone contact to avoid scratching the brush head and transparent shell during the pressure application process; the output pressure of this device is precisely set to 0.06-0.08MPa, which is strictly consistent with the pre-inflation pressure of the damping airbag 2 and the impact pressure when the electric toothbrush is actually used, so as to achieve accurate simulation of real working conditions.

[0060] Next, the constant force pressure device is activated, applying a standard external pressure of 0.06-0.08 MPa vertically to the bristle portion 5 of the brush head body 1 via the silicone contact. This pressure is maintained for 1-2 seconds to ensure sufficient deformation transfer between the damping airbag 2 and the marking element 3. Under this condition, the damping airbag 2 should be properly sealed, have a stable pre-inflation pressure, and its buffer stiffness should be within the acceptable design range. The damping airbag 2 should produce the expected, uniform elastic deformation under this standard external pressure. The internal pressure of the damping airbag 2 is equal to the external pressure that triggers irreversible plastic deformation in the plastic marking area 32.

[0061] Subsequently, the deformation of the shock-absorbing airbag 2 is simultaneously transmitted to the plastic marking area 32 of the marking element 3, triggering irreversible plastic deformation of the plastic marking area 32. After the pressure is applied, the shock-absorbing airbag 2 can return to its initial shape due to its good elasticity, and the reversible elastic deformation generated by the elastic main body area 31 of the marking element 3 also returns to its initial shape.

[0062] S42. Identify the deformed shape of the plastic marking area 32 through the visual window 4.

[0063] Specifically, the camera captures an image of the marker 3, and features are extracted from the image to obtain the shape of the plastic deformation of the plastic marking area 32. In order to improve the image detection accuracy, the visible window 4 is ensured to be open in this step so that the transparent material of the visible window 4 will not affect the camera's capture of the image of the marker 3.

[0064] S43. If the shape of the plastic marking area 32 after deformation falls within the preset range, the toothbrush head is deemed qualified; otherwise, it is deemed unqualified.

[0065] Specifically, for bar-shaped markers (1mm plastic marking area 32 at both ends), the judgment criteria are as follows:

[0066] Acceptance criteria: If the deformed shape of the plastic marking area 32 falls within the preset acceptable range (e.g., the strip marking is bent at 90°-110°), it indicates that the damping airbag 2 is well sealed, the pre-inflation pressure is stable, and the buffer stiffness matches the actual working conditions, and it is judged as acceptable.

[0067] Non-compliance criteria: If there is no obvious deformation in the plastic marking area 32, it indicates that the shock-absorbing airbag 2 is completely leaking, the pressure is completely attenuated, or it has ruptured; if the deformation of the plastic marking area 32 deviates significantly from the preset qualified range (too large or too small), it indicates that the shock-absorbing airbag 2 has a minor leak, abnormal pre-inflation pressure, or excessive buffer stiffness. Both of the above situations are considered non-compliance.

[0068] S5. Packaging qualified toothbrush heads, including the following steps:

[0069] The scratches on the viewing window 4 and the sealing performance of the shock-absorbing airbag were inspected.

[0070] The bristles 5 of the qualified toothbrush head are ground and rounded, and the surface of the viewing window 4 is sprayed with an anti-scratch coating.

[0071] Qualified toothbrush heads are repackaged, and the batch number, air pressure of the damping airbag 2, and amount of adhesive on the packaging are marked on the packaging. A complete quality traceability system is established. The irreversible plastic deformation of the label 3 serves as a traceability certificate, forming a dual traceability system with the packaging parameters.

[0072] In this embodiment, the marker 3 is further provided with an anti-adhesion microstructure on the side facing the damping airbag. The anti-adhesion microstructure is preferably an array of micro-protrusions, and in other embodiments, it can also be a grid-like groove, so as to reduce the contact area between the marker 3 and the damping airbag 2, reduce the interfacial shear force during rebound, and ensure that the elastic recovery of the damping airbag 2 is not affected by the plastic deformation of the marker 3.

[0073] In this embodiment, before packaging the qualified toothbrush head in S5, the visible window is sealed. The specific steps are: the visible window 4 is sealed to the brush head body 1 by welding or sealing ring. The visible window 4 is made of food-grade polycarbonate material with high light transmittance and high wear resistance.

[0074] It should be noted that during the injection molding of the shock-absorbing airbag 2, two-color injection molding or in-mold insert technology can be used to integrally mold the marker 3 with the shock-absorbing airbag 2, eliminating the need for subsequent gluing processes and solving the problems of marker detachment and misalignment from the source, thus achieving standardized integration of components. In addition to the strip structure, a ring or dot matrix structure can be used. The ring marker exhibits a visual effect of reduced diameter when the shock-absorbing airbag 2 contracts, while the dot matrix marker provides a more nuanced reference for the degree of deformation through variations in the dot spacing. The positioning reference groove 111 can also be machined subsequently. The transparent material of the viewing window 4 can also be sealed after the marker 3 and shock-absorbing airbag 2 are installed, allowing for subsequent image acquisition via a high-definition camera.

[0075] After the qualified toothbrush head of the present invention is packaged, the user can perform real-time self-inspection during use. When the user brushes their teeth daily, a light pressure of 0.02MPa is applied to the bristle part 5, which causes the damping airbag 2 to deform. Only the elastic main body area 31 of the marking piece 3 can be triggered to produce reversible elastic deformation. The user can observe the dynamic deformation through the viewing window 4 to judge the current sealing or pressure status of the damping airbag 2: if the deformation is flexible, the damping airbag 2 is normal; if the deformation is weak or there is no deformation, the damping airbag 2 is malfunctioning and needs to be replaced in time. This realizes the dual visualization function of permanent factory marking and real-time self-inspection by the user, taking into account both mass production quality control and user safety.

[0076] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0077] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A method for producing toothbrush heads with visual inspection function, characterized in that, The toothbrush head includes a brush head body, a damping airbag, and a labeling component; the manufacturing method includes: S1. Pre-processing of the brush head body: An airbag mounting cavity and a viewing window are provided on the brush head body. The viewing window is used to display the internal structure of the airbag mounting cavity. S2. Setting and installation of the identification component: The identification component is set to include an elastic body area and a plastic marking area, wherein the plastic deformation threshold of the elastic body area is higher than the plastic deformation threshold of the plastic marking area; the identification component is installed on the inner wall of the airbag mounting cavity through a viewing window, and it is ensured that there is a gap between the elastic body area and the plastic marking area and the inner wall of the airbag mounting cavity; S3. Inflation and installation of the damping airbag: Inflate the damping airbag to the preset internal pressure, install the damping airbag in the airbag installation cavity through the viewing window, and ensure that the marker is within the deformation range of the damping airbag. S4. Factory Inspection: External pressure is applied to the damping airbag, causing it to deform and simultaneously transmit the deformation to the plastic marking area of ​​the marker, triggering irreversible plastic deformation in the plastic marking area. The shape of the plastic marking area after deformation is identified through the visual window; If the shape of the deformed plastic marking area falls within the preset range, the toothbrush head is deemed qualified; otherwise, it is deemed unqualified. S5. Pack the qualified toothbrush heads.

2. The toothbrush head production method with visual inspection function as described in claim 1, characterized in that, Before step S2, a positioning reference groove is set. The specific steps are as follows: a positioning reference groove is opened in the airbag installation cavity. In step S2, the marker is placed in the positioning reference groove and fixed in the positioning reference groove by both ends of the marker.

3. The toothbrush head production method with visual inspection function as described in claim 2, characterized in that, The marker is fixed in the positioning reference groove by applying a small amount of food-grade hot melt adhesive to the non-deformable core areas at both ends. After fixing, the marker is scanned by a CCD vision inspection system to detect whether the offset of the center line of the marker is within a preset range, so as to ensure that the marker is within the deformation range of the shock-absorbing airbag.

4. The toothbrush head production method with visual inspection function as described in claim 1, characterized in that, The elastic main body region is a food-grade thermoplastic elastomer with a plastic deformation threshold ≥ 0.12 MPa; the plastic marking region is a modified plasticized thermoplastic elastomer with a plastic deformation threshold of 0.06-0.08 MPa.

5. The toothbrush head production method with visual inspection function as described in claim 3, characterized in that, The internal pressure of the damping airbag is equal to the external pressure that triggers irreversible plastic deformation in the plastic marking area, and the values ​​of both range from 0.06 to 0.08 MPa.

6. The toothbrush head production method with visual inspection function as described in any one of claims 1 to 4, characterized in that, The marker is a strip, ring, or dot matrix structure, and its color is a dark color that forms a high contrast with the viewing window and the damping airbag.

7. The toothbrush head production method with visual inspection function as described in any one of claims 1 to 4, characterized in that, The identification element has an anti-adhesion microstructure on the side facing the damping airbag.

8. The toothbrush head production method with visual inspection function as described in any one of claims 1 to 4, characterized in that, Before step S5, the process also includes sealing the viewing window. Specifically, the viewing window is sealed to the brush head body by welding or using a sealing ring. The viewing window is made of food-grade polycarbonate material with high light transmittance and high wear resistance.

9. The toothbrush head production method with visual inspection function as described in any one of claims 1 to 4, characterized in that, The step of identifying the deformed shape of the plastic marking area in S4 includes: using a camera to capture an image of the marking component, extracting features from the image, and obtaining the shape of the plastic deformation.

10. The toothbrush head production method with visual inspection function as described in any one of claims 1 to 4, characterized in that, In step S5, the specific steps for packaging qualified toothbrush heads include: The scratches on the viewing window and the sealing performance of the shock-absorbing airbag are inspected. The bristles of qualified toothbrush heads are ground and rounded, and an anti-scratch coating is sprayed onto the surface of the viewing window. Qualified toothbrush heads are repackaged, and the batch number, damping airbag inflation pressure, and adhesive content of the labeling parts are marked on the packaging. A complete quality traceability system is established. The irreversible plastic deformation of the labeling parts serves as a self-evident traceability certificate, forming a dual traceability system with the packaging parameters.

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