Toothbrush head with snubber airbag and visual factory inspection method thereof
By using a combination of damping airbags and markers in the electric toothbrush head, the performance of the airbags can be visualized, solving the problems of low detection efficiency and abstract results. It provides permanent physical markings, is suitable for mass production needs, and reduces costs and maintenance difficulty.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HI P SHANGHAI HOUSING APPLIANCE
- Filing Date
- 2026-04-21
- Publication Date
- 2026-07-21
AI Technical Summary
In existing technologies, the airbag detection efficiency of electric toothbrush heads is low, it cannot achieve full inspection, the test results are abstract and lack physical evidence, the maintenance cost is high, and it is difficult to meet the needs of small and medium-sized production enterprises.
By combining a shock-absorbing airbag and a marker, the deformation state of the marker can be observed through a viewing window, enabling visual detection of the airbag's performance. The marker undergoes irreversible plastic deformation when the airbag deforms, forming a permanent physical mark.
It achieves efficient full inspection, and the test results can be permanently attached to the product. It simplifies testing equipment, reduces costs, ensures quality traceability, and is suitable for mass production needs.
Smart Images
Figure CN122056712B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of quality control in electric toothbrush production, and in particular to a toothbrush head with a damping airbag and a visual method for factory inspection. 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: 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. 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. 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.
[0004] Therefore, there is an urgent need to develop a method for testing electric toothbrush heads and their factory release that is highly efficient, can achieve full inspection, can physically solidify test results, and is low-cost and adaptable to mass production. Summary of the Invention
[0005] In view of this, the purpose of the present invention is to provide a toothbrush head with a damping airbag and a visual factory inspection method thereof, 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.
[0006] On one hand, the present invention provides a toothbrush head with a damping airbag, comprising: A damping airbag is disposed in the airbag mounting cavity of the toothbrush head, and the damping airbag is a sealed airbag pre-filled with gas. An identification element is disposed within the airbag mounting cavity and located within the deformation range of the damping airbag. The identification element includes an elastic main body area and a plastic marking area, wherein the plastic deformation threshold of the elastic main body area is higher than the plastic deformation threshold of the plastic marking area. A viewing window, located on the toothbrush head and forming the installation entrance of the airbag mounting cavity, is used to observe the damping airbag and the identification piece; The plastic marking area is configured to undergo irreversible plastic deformation when the damping airbag is subjected to external pressure, in sync with the deformation of the damping airbag. The elastic main body region is configured to undergo reversible elastic deformation when the damping airbag is subjected to external pressure, in sync with the deformation of the damping airbag.
[0007] 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 and an elastic recovery rate ≥ 95%; the plastic marking region is a modified plasticized thermoplastic elastomer with a plastic deformation threshold of 0.06-0.08 MPa.
[0008] 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.
[0009] As a further improvement to the above technical solution, a positioning reference groove is provided in the airbag mounting cavity, the marking element is located in the positioning reference groove and is fixed in the positioning reference groove by both ends, and there is a gap between the elastic body area and the plastic marking area and the inner wall of the airbag mounting cavity.
[0010] 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.
[0011] 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.
[0012] On the other hand, this application provides a visual factory inspection method for a toothbrush head with a damping airbag as described above, comprising the following steps: S1. Install the damping airbag and the identification piece into the airbag mounting cavity of the toothbrush head through the installation inlet; S2. Apply external pressure to the damping airbag to cause the damping airbag to deform and transmit the deformation synchronously to the plastic marking area of the marking component, triggering irreversible plastic deformation in the plastic marking area. S3. Identify the shape of the plastic marking area after deformation through the visual window; S4. 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.
[0013] As a further improvement to the above technical solution, in step S2, when applying external pressure to the damping airbag, a standard pressure of 0.06-0.08 MPa is applied vertically to the bristles of the toothbrush head through the silicone contact, and a stable pressure state is maintained for 1-2 seconds.
[0014] As a further improvement to the above technical solution, the identification step in S3 includes: using a camera to capture an image of the marker, extracting features from the image, and obtaining the shape of the plastic deformation.
[0015] As a further improvement to the above technical solution, the visual window is opened before the identification step in S3, and the visual window is closed after the toothbrush head is determined to be qualified in S4, and then sealed with the toothbrush head.
[0016] The beneficial effects of this invention are as follows: This invention installs a marker between the damping airbag and the inner wall of the airbag mounting cavity, with the plastic marking area located within the airbag's deformation range. When the damping airbag is subjected to external pressure, the plastic marking area undergoes irreversible plastic deformation synchronously with the damping airbag. By visually observing the shape of the marker through a viewing window, the quality of the damping airbag can be determined. This transforms the abstract conclusion of the damping airbag's performance qualification into an irreversible physical marking inherent in the product. The marking is irreversible and permanently retained, eliminating the need for electronic records. Any step can be visually verified through the viewing window, solving the pain points of abstract test results and difficulty in traceability in existing technologies.
[0017] 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
[0018] 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.
[0019] Figure 1 This is a schematic diagram of the structure of a toothbrush head with a damping airbag provided in Embodiment 1 of the present invention (including a partial cross-sectional view of the airbag mounting cavity).
[0020] Figure 2 for Figure 1 The left view.
[0021] Figure 3 This is a flowchart illustrating a visual factory inspection method for a toothbrush head with a damping airbag, as provided in Embodiment 2 of the present invention.
[0022] Figure label: 1. Toothbrush head; 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
[0023] 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.
[0024] 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.
[0025] 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.
[0026] 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.
[0027] 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.
[0028] Example 1 This invention provides a toothbrush head with a damping airbag.
[0029] like Figure 1 and Figure 2 As shown, the toothbrush head with a damping airbag in this embodiment includes a damping airbag 2, an identifier 3, and a viewing window 4. The toothbrush head 1 has bristle sections 5. An airbag mounting cavity 11 is provided inside the toothbrush head 1 for mounting the damping airbag 2 and the identifier 3. The viewing window 4 is disposed on the surface of the toothbrush head 1, opposite to the bristle sections 5, and communicates with the airbag mounting cavity 11 to display the internal structure of the airbag mounting cavity 11, and also constitutes the mounting entrance of the airbag mounting cavity 11.
[0030] Specifically, the shock-absorbing airbag 2 is a pre-filled sealed airbag, and the shock-absorbing airbag 2 is installed in the airbag mounting cavity 11 through the viewing window 4.
[0031] The marking element 3 includes an elastic main body region 31 and a plastic marking region 32. The plastic deformation threshold of the elastic main body region 31 is higher than that of the plastic marking region 32. The plastic marking region 32 is configured to undergo irreversible plastic deformation synchronously with the shock-absorbing airbag 2 when the shock-absorbing airbag 2 is subjected to external pressure. The elastic main body region 31 is configured to undergo reversible elastic deformation synchronously with the shock-absorbing airbag 2 when the shock-absorbing airbag 2 is subjected to external pressure. That is, under a certain external force, the plastic marking region 32 is more likely to undergo irreversible deformation than the elastic main body region 31. The marker 3 is installed inside the airbag mounting cavity 11 through the viewing window 4. The marker 3 is located between the damping airbag 2 and the inner wall of the airbag mounting cavity 11. It is crucial to ensure that the deformation of the plastic marking area 32 accurately reflects the deformation of the airbag mounting cavity 11. Specifically, the plastic marking area 32 must be within the deformation range of the damping airbag 2 (the distance between the plastic marking area 32 and the damping airbag 2 is less than the deformation of the damping airbag 2). This ensures that the deformation of the damping airbag 2 is fully transmitted to the plastic marking area 32. The deformation state within the damping airbag 2 and the marker 3 can be observed through the viewing window 4.
[0032] In this embodiment, the viewing window 4 is further made of food-grade polycarbonate material with high light transmittance and high wear resistance, preferably with a thickness of 0.9mm and a light transmittance of ≥92%, ensuring clear observation of the deformation state of the damping airbag 2 and the label 3 inside the airbag mounting cavity 11, while also possessing a certain aesthetic appeal and durability. The viewing window 4 is open before the installation of the internal parts such as the damping airbag 2 and the label 3. After the internal parts are installed, the viewing window 4 is closed and sealed to the toothbrush head. The connection is permanently sealed using ultrasonic welding or a high-precision sealing ring to prevent liquid from seeping into the airbag mounting cavity 11 and affecting the internal parts, while also improving the overall structural integrity and achieving a standardized sealing process. It should be noted that the viewing window 4 can be closed and sealed after the internal parts such as the damping airbag 2 and the label 3 are assembled, or it can be closed and sealed after passing factory inspection (before product packaging). This ensures unobstructed viewing of the deformed shape of the label 3.
[0033] In this embodiment, the cushioning airbag 2 is further made of food-grade silicone, possessing excellent elasticity and sealing properties. It is filled with inert gas and sealed, and after precise adjustment, the internal air pressure is stabilized at 0.06-0.08 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 installed within the airbag mounting cavity 11 and partially fixed, ensuring that the core deformation area of the cushioning airbag 2 is in a free deformation state.
[0034] In this embodiment, the marker 3 is further configured as a strip, taking a size of 8mm long × 2mm wide × 0.3mm thick 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 plastic marking area 32 is a modified plasticized thermoplastic elastomer with a plastic deformation threshold of 0.06-0.08MPa. The elastic body area 31 is located in the 6mm area in the center of the marker 3, accounting for ≥85%. The elastic body area 31 is a food-grade thermoplastic elastomer with a plastic deformation threshold of ≥0.12MPa and an elastic recovery rate of ≥95%. The elastic body area 31 is not modified in any way, maintaining its original high elasticity. The marker 3 is preferably dark gray, forming 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.
[0035] It should be noted that the marking element 3 can be in the form of a strip, or it can also be a ring or a dot matrix structure. Depending on the different shapes of the marking element 3, the plastic deformation characteristics of its plastic marking area 32 are as follows: Bar-shaped markers: change from an initial straight state to a permanent bend at a preset angle; Ring-shaped marker: The diameter undergoes irreversible shrinkage, shrinking to a preset value; Dot matrix markers: The spacing between the dots shrinks or shifts irreversibly at a fixed ratio; After the external pressure of the shock-absorbing airbag 2 is removed, the plastic deformation characteristics of the plastic marking area 32 are permanently maintained. Therefore, the core performance status of the shock-absorbing airbag 2 has been "written" into the marking piece 3, forming a permanent physical inspection mark attached to the product.
[0036] In this embodiment, a positioning reference groove 111 is further provided on the inner wall of the airbag mounting cavity 11. The positioning reference groove 111 is preferably processed by integral molding. The marking element 3 is positioned in the positioning reference groove 111, and its two ends are fixed in the positioning reference groove 111 by applying food-grade hot melt adhesive (0.01-0.02 grams of adhesive). 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 marking element 3 is in a state where both ends are fixed and the middle is suspended, ensuring that the marking element 3 can respond freely when the damping airbag 2 deforms. Two positioning reference grooves 111 are provided, and one marking element 3 is provided in each positioning reference groove 111. The two marking elements 3 are respectively located on the adjacent sides of the viewing window 4, so that the two marking elements 3 can be observed through the viewing window 4. After the marker 3 and the shock-absorbing airbag 2 are installed, the shock-absorbing airbag 2 is pressed against the side wall by a flexible pressing tool, so that the outer wall of the airbag and the inner side of the marker are fitted without gaps, eliminating air gaps and ensuring 1:1 deformation transmission; after the fit is formed, the pre-inflation pressure of the shock-absorbing airbag 2 will form a continuous fitting force to avoid separation during use.
[0037] In this embodiment, the marker 3 is further provided with an anti-adhesion microstructure on the side facing the damping airbag 2. The anti-adhesion microstructure is preferably an array of micro-protrusions. 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 interface 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.
[0038] In this embodiment, 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, and the values of both range from 0.06 to 0.08 MPa. In this embodiment, 0.07 MPa is preferred.
[0039] The implementation principle of the toothbrush head with damping airbag in this embodiment is as follows: Assembly: Install the marker 3 into the positioning reference groove 111 of the airbag mounting cavity 11 through the installation inlet and fix it. Install and fix the inflated shock-absorbing airbag 2 into the airbag mounting cavity 11, and adjust the position between the shock-absorbing airbag 2 and the marker 3 to achieve a gapless fit between the two. Finally, close the viewing window 4 and seal it.
[0040] Factory inspection: Apply a standard external pressure of 0.06-0.08MPa to the damping airbag 2 on the toothbrush head 1. The damping airbag 2 deforms and is simultaneously transmitted to the plastic marking area 32 of the marking component 3. This triggers irreversible plastic deformation in the plastic marking area 32, forming a permanent physical marking. This marking directly reflects that the damping airbag 2 is qualified at the time of leaving the factory. It is bound to the toothbrush head 1 to achieve full life cycle traceability.
[0041] Real-time self-check on the user end: When the user brushes their teeth daily, a light touch pressure of 0.02MPa causes the damping airbag 2 to deform. This can only trigger the elastic main body area 31 of the indicator 3 to produce reversible elastic deformation. The user can observe this dynamic deformation through the viewing window 4 to determine 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.
[0042] This embodiment of the toothbrush head with a cushioning airbag addresses the industry pain point of performance testing of the airbag cushioning layer in electric toothbrush heads. By utilizing a visual testing marker that precisely fits the core deformation area of the airbag, and through standardized mechanical pressure during factory testing, the abstract conclusion of "performance qualified" of the airbag is transformed into an intuitive and irreversible physical mark attached to the product itself, achieving lifelong traceability of the test results throughout its entire lifecycle. At the same time, it also takes into account the user's need for visual self-inspection of the real-time working status of the airbag, constructing a dual visual testing system of "permanent factory marking plus real-time user self-inspection", thus eliminating the need for any electronic pressure sensors.
[0043] Example 2 This invention provides a visual factory inspection method for toothbrush heads with damping airbags.
[0044] like Figure 3 As shown, the visual factory inspection method of this embodiment is applicable to the toothbrush head with a damping airbag in Embodiment 1. The method includes the following steps: S1. Install the damping airbag 2 and the identification piece 3 into the airbag mounting cavity 11 of the toothbrush head 1 through the installation inlet.
[0045] Specifically, a positioning reference groove 111 is first opened in the airbag installation cavity 11, and the marking piece 3 is positioned in the positioning reference groove 111. The marking piece 3 is fixed in the positioning reference groove 111 by applying glue to both ends, ensuring that the marking piece 3 is in a state where both ends are fixed and the middle is suspended.
[0046] Then, the inflated shock-absorbing airbag 2 is installed and fixed in the airbag mounting cavity 11, and the position between the shock-absorbing airbag 2 and the marker 3 is adjusted to achieve a gapless fit between the two.
[0047] S2. 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.
[0048] 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.
[0049] Next, the constant pressure device is activated, and a standard external pressure of 0.06-0.08 MPa is applied vertically to the bristle part 5 of the toothbrush head 1 through the silicone contact. The pressure is maintained for 1-2 seconds to ensure that the damping airbag 2 and the marking part 3 complete the full deformation transmission. In this state, the damping airbag 2 should be well sealed, the pre-inflation pressure should be stable, and the buffer stiffness should be within the qualified design range. The damping airbag 2 produces the expected and uniform elastic deformation under the standard pressure.
[0050] Next, the shock-absorbing airbag 2 deforms and 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.
[0051] S3. Identify the deformed shape of the plastic marking area 32 through the visual window 4.
[0052] 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.
[0053] S4. 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.
[0054] Specifically, for bar-shaped markers (1mm plastic marking area 32 at both ends), the judgment criteria are as follows: 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. 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.
[0055] Finally, the qualified toothbrush head 1 is packaged. Before packaging the toothbrush head 1, ensure that the viewing window 4 is closed and sealed with the toothbrush head.
[0056] The core innovation of the visual factory inspection method of the present invention lies in the fact that, through one-time standardized mechanical pressure that is precisely matched with the actual use conditions, the three core performance parameters of the shock-absorbing airbag 2—sealing integrity, pre-inflation pressure stability, and buffer stiffness—are directly transformed into the irreversible plastic deformation of the visual inspection marker 3.
[0057] The physical basis for this transformation lies in the fact that although the materials of the cushioning airbag 2 and the marking component 3 are both elastomers, they have different mechanical response characteristics. Under a standard pressure of 0.06-0.08 MPa, the cushioning airbag 2 remains within its elastic deformation range and can completely return to its original shape after the pressure is applied; while the stress on the marking component 3 exceeds its plastic yield threshold, resulting in irreversible molecular chain rearrangement and morphological changes. After the pressure is withdrawn, the elastic recovery force of the cushioning airbag 2 is insufficient to "pull back" the plastically deformed marking component to its original position, thus achieving the ideal state of "airbag repositioning and marking component maintaining its shape after pressure," 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 airbag to pass the factory performance test, without relying on any electronic records. Subsequently, throughout the product's entire life cycle, the factory inspection status of the cushioning airbag 2 can be quickly verified simply by visually observing the shape of the marking component 3 through the transparent viewing window 4, achieving rapid quality traceability without records or equipment.
[0058] 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.
[0059] 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 toothbrush head with a damping airbag, characterized in that, include: A damping airbag is disposed in the airbag mounting cavity of the toothbrush head, and the damping airbag is a sealed airbag pre-filled with gas. An identification element is disposed within the airbag mounting cavity and located within the deformation range of the damping airbag. The identification element includes an elastic main body area and a plastic marking area, wherein the plastic deformation threshold of the elastic main body area is higher than the plastic deformation threshold of the plastic marking area. A viewing window, located on the toothbrush head and forming the installation entrance of the airbag mounting cavity, is used to observe the damping airbag and the identification piece; The plastic marking area is configured such that when the damping airbag is subjected to external pressure greater than the plastic deformation threshold of the plastic marking area, it undergoes irreversible plastic deformation synchronously with the damping airbag. The elastic main body region is configured such that when the damping airbag is subjected to external pressure less than the plastic deformation threshold of the elastic main body region, it undergoes reversible elastic deformation in sync with the deformation of the damping airbag.
2. The toothbrush head with a damping airbag 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 and an elastic recovery rate ≥ 95%; the plastic marking region is a modified plasticized thermoplastic elastomer with a plastic deformation threshold of 0.06-0.08 MPa.
3. The toothbrush head with a damping airbag as described in claim 2, 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.
4. The toothbrush head with a damping airbag as described in any one of claims 1 to 3, characterized in that, The airbag mounting cavity is provided with a positioning reference groove, the marker is located in the positioning reference groove and is fixed in the positioning reference groove by both ends, and there is a gap between the elastic body area and the plastic marking area and the inner wall of the airbag mounting cavity.
5. The toothbrush head with a damping airbag as described in any one of claims 1 to 3, 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.
6. The toothbrush head with a damping airbag as described in any one of claims 1 to 3, characterized in that, The identification element has an anti-adhesion microstructure on the side facing the damping airbag.
7. A visual factory inspection method for a toothbrush head with a damping airbag as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Install the damping airbag and the identification piece into the airbag mounting cavity of the toothbrush head through the installation inlet; S2. Apply external pressure to the damping airbag to cause the damping airbag to deform and transmit the deformation synchronously to the plastic marking area of the marking component, triggering irreversible plastic deformation in the plastic marking area. S3. Identify the shape of the plastic marking area after deformation through the visual window; S4. 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.
8. The visual factory inspection method for toothbrush heads as described in claim 7, characterized in that, In step S2, when external pressure is applied to the damping airbag, a standard pressure of 0.06-0.08 MPa is applied vertically to the bristles of the toothbrush head through the silicone contact, and the pressure is maintained for 1-2 seconds.
9. The visual factory inspection method for toothbrush heads as described in claim 7, characterized in that, The identification step in S3 includes: using a camera to capture an image of the marker, extracting features from the image, and obtaining the shape of the plastic deformation.
10. The visual factory inspection method for toothbrush heads as described in claim 9, characterized in that, Before performing the identification step in S3, the visual window is opened. After determining that the toothbrush head is qualified in S4, the visual window is closed and sealed with the toothbrush head.