Dynamic air tightness detection machine for electric toothbrush

Abstract

This utility model relates to a dynamic airtightness testing machine for electric toothbrushes, comprising a test chamber, a vacuuming device, a clamp, a pressing device, a heating device, and a load. The test chamber forms a sealed water-retaining cavity. The clamp holds the handle of the electric toothbrush, the pressing device presses a button on the handle, and the load applies force to the brush head. During dynamic airtightness testing, the electric toothbrush is clamped and fixed in the liquid within the water-retaining cavity by the clamp. The vacuuming device evacuates the water-retaining cavity. The pressing device starts or stops the electric toothbrush. The load applies force to the brush head to simulate the pressure-bearing working state of the brush head during brushing, thereby performing dynamic airtightness testing. The heating device heats the liquid in the water-retaining cavity. This application aims to provide an apparatus and method for dynamic airtightness testing of electric toothbrushes.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment, and in particular to a dynamic airtightness testing machine for electric toothbrushes. Background Technology

[0002] As an essential tool for modern oral care, the electric toothbrush is designed by combining advanced electronic technology with ergonomic principles, aiming to improve cleaning efficiency and comfort through high-frequency vibration. An electric toothbrush typically consists of two parts: a brush head and a handle. The handle houses various electrical components, including a motor, battery, and control circuitry. These components have strict requirements for their operating environment, especially in situations involving water contact. Ensuring the airtightness of the handle's interior is crucial to prevent moisture ingress that could lead to short circuits, component damage, or safety hazards.

[0003] Currently, airtightness testing is a crucial part of the quality inspection process for electric toothbrushes before they leave the factory. Traditionally, since the brush head does not involve complex electronic components, airtightness testing mainly focuses on the brush handle. The testing method often uses the principle of negative pressure suction, which involves sealing the brush handle using a specific tooling mold and extracting air from the mold, monitoring the volume of the extracted gas. If the volume of extracted gas is greater than the difference between the volume of the tooling mold cavity and the volume occupied by the electric toothbrush handle, it is considered to have poor airtightness and leakage.

[0004] However, while this static testing method can reflect the airtightness of the brush handle to some extent, its limitations are also obvious. First, it fails to fully consider the dynamic characteristics of electric toothbrushes in actual use. When an electric toothbrush is working, it outputs high-frequency vibrations through the motor's output shaft. Under such high-frequency vibration, the seals on the output shaft or the brush handle shell may experience minute changes in gaps, and uneven material stress distribution may lead to changes in sealing performance. These changes can all potentially cause the electric toothbrush to fail to maintain its airtightness. Second, static testing cannot simulate the sealing performance of an electric toothbrush under real working conditions (such as changes in angle and force during brushing). The sealing performance of an electric toothbrush under static conditions differs significantly from that under dynamic conditions, making it difficult to comprehensively and accurately assess its airtightness reliability in actual use.

[0005] In view of the above problems, there is an urgent need to improve the current airtightness testing technology for electric toothbrushes. The aim is to develop an airtightness testing device and method that can dynamically simulate the working state of an electric toothbrush, so as to be closer to the actual application scenario, ensure the waterproof performance and safety of the product under various usage conditions, and thus improve the user experience and product competitiveness. Utility Model Content

[0006] The purpose of this utility model is to solve the above-mentioned technical problems and provide a dynamic airtightness testing machine for electric toothbrushes. This application is to provide a device for dynamic airtightness testing of electric toothbrushes.

[0007] A dynamic airtightness testing machine for electric toothbrushes includes a test chamber, a vacuuming device, a clamp, a pressing device, a heating device, and a load. The test chamber forms a sealed water-retaining cavity. The clamp holds the handle of the electric toothbrush, the pressing device presses a button on the handle, and the load applies force to the brush head. During dynamic airtightness testing, the electric toothbrush is clamped and fixed in the liquid within the water-retaining cavity by the clamp. The vacuuming device evacuates the water-retaining cavity. The pressing device starts or stops the electric toothbrush. The load applies force to the brush head to simulate the pressure-bearing working state of the brush head during brushing, thereby performing dynamic airtightness testing on the electric toothbrush. The heating device heats the liquid in the water-retaining cavity.

[0008] According to the dynamic airtightness testing machine for electric toothbrushes disclosed in this application, the testing equipment can simulate the working environment of an electric toothbrush, even a more severe testing environment than the normal working environment, to test the airtightness of the electric toothbrush. During the test, liquid is injected into the water storage chamber, and the electric toothbrush is directly immersed in the liquid by fixing it with a clamp. The electric toothbrush is then activated by pressing a device, causing the brush head to vibrate. A load is applied to the brush head, thereby simulating the interaction force generated when the brush head contacts the teeth, thus more closely resembling real-world application scenarios and ensuring the waterproof performance and safety of the product under various usage conditions. This enhances user experience and product competitiveness. By using a vacuum device to evacuate the water storage chamber, continuous bubbles appearing on the brush handle indicate that the electric toothbrush's airtightness is insufficient and it fails the test. The heating device heats the liquid in the water storage chamber, simulating the test scenario of consumers using hot water to shower and brush their teeth. Currently, the industry's airtightness test only uses a vacuum pump to evacuate room-temperature liquids, without considering the effect of temperature. Vacuuming at high temperatures can meet the testing requirements and also test for issues such as water vapor, sealing rubber, and aging in electric toothbrushes.

[0009] Furthermore, the load includes a force-applying component that can be adjusted to contact different positions of the brush head, allowing it to apply force to the brush head from different angles. This allows the force-applying component to apply force to the brush head from different angles, more closely mimicking the brush head's working environment, making the airtightness test of the brush handle more comprehensive and easier to detect airtightness defects in the product. Here, the force-applying component is a motor-driven lead screw force-applying assembly, which applies force to the brush head by setting different angles (for example, with the brush head as the center, a motor-driven lead screw force-applying assembly is evenly arranged every 90 degrees, thereby selectively applying pressure at different angles to the brush head). Of course, the motor and lead screw components in this solution employ existing sealing technologies to ensure effective sealing under water pressure.

[0010] Furthermore, the load includes a connecting wire and a weight, with the weight suspended from the brush head via the connecting wire. This application employs a load structure of connecting wire and weight, which is simple in structure and allows for rapid installation and testing.

[0011] Furthermore, the load includes a connecting wire and a weight that generates downward gravity, the weight being movably suspended from the brush head via the connecting wire; the clamp can drive the brush handle to rotate axially, thereby allowing the downward gravity of the weight to be applied variablely to different angles of the brush head. In this solution, the weight is used as a force-applying component, and its operation differs from the first solution in that, by rotating the brush handle, the downward pressure generated by the weight can be gradually applied to the brush head at different angles. Obviously, to ensure smooth operation, the rotation of the clamp must be gradual, so that the weight can continuously and evenly apply pressure to the brush head during rotation. In addition, the clamp in this solution can be driven by an existing geared motor, and the motor and other components utilize current sealing technology to ensure effective sealing under water pressure.

[0012] Furthermore, it also includes a lifting device. The cover of the test chamber is mounted on the lifting device. The cover descends with the lifting device to seal the water storage chamber, and rises with the lifting device to open the water storage chamber. Raising and lowering the cover of the test chamber with the lifting device makes it easy to install the electric toothbrush into the water storage chamber. The lifting device also includes a mounting plate extending into the water storage chamber. The clamp includes an upper clamp, a lower clamp, and a clamp driving device. The lower clamp is mounted on the mounting plate. Driven by the clamp driving device, the upper clamp moves up and down above the lower clamp, clamping the brush handle between the upper and lower clamps. The pressing device is fixed to the upper clamp.

[0013] Furthermore, the upper clamp and / or lower clamp are equipped with pressure sensors, which, upon sensing that the brush handle is clamped, cause the clamp driving device to stop driving the upper clamp.

[0014] Furthermore, it also includes a base, in which the vacuuming device is disposed, and the vacuuming device is connected to the water storage chamber through an air extraction pipe.

[0015] Furthermore, the heating device is located in the water storage chamber.

[0016] Furthermore, it also includes a liquid level sensor and a temperature sensor. The liquid level sensor is installed in the water storage cavity and is used to detect the liquid level height in the water storage cavity. The temperature sensor is installed in the water storage cavity and is used to sense the temperature of the liquid in the water storage cavity. Attached Figure Description

[0017] Figure 1 This is a perspective view of the dynamic airtightness testing machine for the electric toothbrush of this utility model when it is turned on.

[0018] Figure 2 This is an exploded view of the clamp, pressing device, and load in the dynamic airtightness testing machine for the electric toothbrush of this utility model.

[0019] Figure 3 This is a schematic diagram of the dynamic airtightness testing machine for the electric toothbrush of this utility model during testing.

[0020] Figure 4 This is a schematic diagram of the internal structure of the test chamber of the dynamic airtightness testing machine for the electric toothbrush of this utility model.

[0021] Figure 5 This is an exploded view of the dynamic airtightness testing machine for the electric toothbrush of this utility model.

[0022] Figure 6 This is a cross-sectional view of the dynamic airtightness testing machine for the electric toothbrush of this utility model. Detailed Implementation

[0023] The present invention relates to a dynamic airtightness testing machine for an electric toothbrush, described in conjunction with the accompanying drawings.

[0024] like Figures 1 to 6The diagram illustrates a dynamic airtightness testing machine for an electric toothbrush, comprising a test chamber 12, a vacuuming device, a clamp 3, a pressing device 4, and a load 5. The test chamber 12 contains a sealed water-retaining cavity 11. The clamp 3 holds the handle of the electric toothbrush, the pressing device 4 presses a button on the handle, and the load 5 applies force to the brush head. During dynamic airtightness testing, the electric toothbrush is held and fixed in the liquid within the water-retaining cavity 11 by the clamp 3. The vacuuming device evacuates the water-retaining cavity 11. The pressing device 4 starts the electric toothbrush, and the load 5 applies force to the brush head, thereby testing the airtightness of the electric toothbrush. The electric toothbrush undergoes a dynamic airtightness test. During the test, liquid is injected into the water storage chamber 11 and fixed by the clamp 3, allowing the electric toothbrush to be directly immersed in the liquid. The electric toothbrush is started by pressing the device 4, causing the brush head to start vibrating. The load 5 applies force to the brush head, simulating the interaction force generated when the brush head comes into contact with the teeth, to more closely resemble actual application scenarios and ensure the waterproof performance and safety of the product under various usage conditions, thereby improving user experience and product competitiveness. The water storage chamber 11 is evacuated by a vacuum device. When continuous bubbles are observed emerging from the brush handle, it can be determined that the electric toothbrush has insufficient airtightness and has failed the test.

[0025] like Figures 1 to 6 As shown, this application discloses a simplified scheme for a load 5, which includes a connecting wire 52 and a weight 51. The weight 51 is hung on the brush head through the connecting wire 52, and the weight 51 acts on the brush head through gravity to simulate the interaction force between the brush head and the teeth when brushing.

[0026] The load 5 includes a force-applying component, which can be adjusted to contact different positions of the brush head, so that the force-applying component applies force to the brush head from different angles. The force-applying component can apply force to the brush head from different angles, which can be closer to the working environment of the brush head, making the airtightness test of the brush handle more comprehensive and making it easier to find airtightness defects in the product.

[0027] The force-applying component can be a motor-driven lead screw force-applying assembly. The specific structure can adopt a push rod motor structure similar to the pressing device 4. By setting different angles, force is applied to the brush head. For example, with the brush head as the center, a motor-driven lead screw force-applying assembly is evenly arranged every 90 degrees, so that different angles of pressure can be selectively applied to the brush head. Of course, the motor and lead screw components in this solution adopt existing sealing technology to ensure effective sealing under water pressure.

[0028] The force-applying component can also be improved based on the simplified load scheme 5 disclosed in the attached figure. The force-applying component includes a connecting wire 52, a weight 51, and a magnet. The magnet and the weight 51 attract each other. The weight 51 is hung on the brush head through the connecting wire 52. The magnet is set below the test chamber 12. By adjusting the position of the magnet, the position of the weight 51 can be adjusted, thereby applying force to the brush head from different angles. Through magnetic attraction control, the sealing of the water storage chamber 11 can be avoided.

[0029] This application also provides another embodiment of the load 5, which includes a connecting line 52 and a weight 51 that generates downward gravity. The weight 51 is movably suspended on the brush head via the connecting line 52. The clamp 3 can drive the brush handle to rotate axially, thereby allowing the downward gravity of the weight 51 to be applied to different angles of the brush head in a variable manner. In this embodiment, the weight 51 is used as a force-applying component, and its operation differs from the aforementioned embodiment in that, by rotating the brush handle, the downward pressure generated by the weight 51 can be gradually applied to the brush head at different angles. Obviously, to ensure smooth operation, the rotation of the clamp 3 must be gradual, so that the weight 51 can continuously and uniformly apply pressure to the brush head during rotation. Furthermore, the clamp 3 in this embodiment can be driven by an existing geared motor, and the motor and other components utilize current sealing technology to ensure effective sealing under water pressure.

[0030] like Figures 1 to 6 As shown, in order to facilitate the installation and disassembly of the electric toothbrush, the dynamic airtightness testing machine of the electric toothbrush of this application is also provided with a lifting device 6. A cover 12 is provided above the test chamber 12. The cover 12 is installed on the lifting device 6, so that the cover 12 can rise or fall with the lifting device 6. When the cover 12 falls to cover the test chamber 12, it seals the water storage chamber 11, thereby preventing the water storage chamber 11 from leaking air when the vacuum device is vacuuming. When the cover 12 rises, the water storage chamber 11 can be opened.

[0031] like Figures 3 to 5As shown, the lifting device 6 includes a lifting plate 63, which is L-shaped and extends from one side of the cover 12 to the top of the cover 12 and is fixed thereto, thereby driving the cover 12 to rise and fall together. The lifting device 6 also includes a lifting motor 66, a lifting belt 64, and multiple pulleys 65. One pulley 65 is mounted on the output shaft of the lifting motor 66, and the lifting belt 64 is sleeved on the multiple pulleys 65. A slider 631 extends from the lifting plate 63 toward the lifting belt 64, and the side of the slider 631 is fixedly connected to the lifting belt 64, so that the lifting plate 63 can rise and fall under the drive of the lifting motor 66. The outer wall of the test chamber 12 is provided with a slide rail 13 at the position corresponding to the slider 631. The slider 631 slides on the slide rail 13, and the slide rail 13 guides the rise and fall of the lifting device 6. Preferably, two slide rails 13 and two sliders 631 are provided, and only one side of the slider 631 is fixedly connected to the lifting belt 64.

[0032] The lifting device 6 extends into the water storage cavity 11 and is equipped with an installation plate 61. The installation plate 61 is connected to the cover 12 via two extension columns 62, allowing the installation plate 61 to rise and fall with the lifting plate 63. The clamp 3 is disposed between the two extension columns 62. The clamp 3 includes an upper clamp 32, a lower clamp 31, and a clamp driving device 33. The lower clamp 31 is mounted on the installation plate 61. Figure 2 As shown, a screw hole 312 is provided in the middle of the lower clamp 31, and clamping positions for brush handles are provided on both sides of the screw hole 312. A guide hole 311 is provided on the outer side of the clamping position. The clamp driving device 33 is a motor, and the output shaft of the motor is a screw shaft 331. The upper clamp 32 is fixed on the screw shaft 331, so that the upper clamp 32 moves up and down above the lower clamp 31 under the drive of the clamp driving device 33. The screw shaft 331 is threadedly connected to the screw hole 312, so that the screw shaft 331 rotates forward or backward in the screw hole 312, which can make the upper clamp 32 and the clamp driving device 33 move up and down. A guide post 321 is provided at the position corresponding to the guide hole 311 of the clamp 32. The guide post 321 is inserted into the guide hole 311 and guides the upper clamp 32 when it moves up and down, so that the brush handle is clamped between the upper clamp 32 and the lower clamp 31. The pressing device 4 is fixed on the upper clamp 32. The pressing device 4 includes a fixing strip and a push rod motor 41. One end of the fixing strip is welded and fixed to the upper clamp 32, and the other end is used to fix the push rod motor 41. The button of the electric toothbrush is below the push rod motor 41. The button can be pressed by extending the push rod motor 41, so that the electric toothbrush enters the working state of brushing teeth during the test.

[0033] In a preferred embodiment, a pressure sensor is provided on the clamping position of the upper clamp 32 and / or the lower clamp 31. The clamping position is an arc-shaped groove provided on the upper clamp 32 and the lower clamp 31. The shape of the clamping position matches the shape of the electric toothbrush, so that the electric toothbrush is stably clamped between the upper clamp 32 and the lower clamp 31. After the pressure sensor senses that the brush handle is clamped, the clamp driving device 33 stops driving the upper clamp 32.

[0034] like Figures 1 to 6 As shown, it also includes a base 2, and the vacuum pump is installed in the base 2. The vacuum pump is connected to the water storage chamber 11 through a vacuum pipe 22. The vacuum pump is a vacuum pump 21. Figure 4 The air extraction port 17 of the test chamber 12 is located at the top. When filling the test chamber 12 with water, the water level should be kept below the height of the air extraction port 17. In addition, a waterproof light 14 is also provided in the test chamber 12, which makes it easier for testers to observe the test status and test results of the electric toothbrush. A drain pipe 23 is also provided on the base 2, and a water valve is provided at the end of the drain pipe 23. The test chamber is located above the base 2, and the drain pipe 23 is connected to the water storage chamber 11 in the test chamber. This allows the water in the water storage chamber 11 to be emptied after the drain pipe 23 opens the water valve.

[0035] like Figure 6 The lifting motor 66 is also installed in the base 2.

[0036] like Figures 1 to 6 As shown, it also includes a heating device 7, which is a heating element. The heating device 7 is disposed in the water storage chamber 11. The heating device 7 is used to heat the liquid in the water storage chamber 11. In daily use of electric toothbrushes, there is a behavior of brushing teeth with hot water. Therefore, when testing the airtightness of electric toothbrushes, it is also necessary to test the airtightness of electric toothbrushes in a hot water environment. This is to be closer to the actual application scenario and ensure the waterproof performance and safety of the product under various usage conditions. At the same time, it can also test the water vapor, sealing soft rubber, aging and other issues of electric toothbrushes.

[0037] like Figure 4 As shown, it also includes a liquid level sensor 16, which is disposed in the water storage chamber 11. The liquid level sensor 16 is used to detect the liquid level height in the water storage chamber 11 and to detect the height of the liquid injected into the water storage chamber 11. For example, it can provide a reminder when the liquid level is too high to prevent too much water from being injected and flowing into the vacuum pump 21 from the air extraction hole 17. It can also stop the testing of the electric toothbrush when the liquid level is too low to avoid generating invalid test information.

[0038] like Figure 4As shown, it also includes a temperature sensor 15, which passes through one side wall of the test chamber 12 so that the sensing end of the temperature sensor 15 can be placed in the water storage chamber 11. The temperature sensor 15 is used to sense the temperature of the liquid in the water storage chamber 11, so that it can work with the heating device 7 to heat the water in the water storage chamber 11 to the temperature required for testing, thereby enabling the tester to obtain more accurate test data.

[0039] A method for testing the dynamic airtightness of an electric toothbrush includes a test chamber, a vacuum device, a heating device, a clamp, a pressing device, and a load. The dynamic airtightness testing method includes the following steps:

[0040] Preparation steps: inject test liquid into the water storage chamber of the test chamber, clamp and fix the handle of the electric toothbrush so that the electric toothbrush is in the test liquid, and the pressing device is opposite to the button on the handle to hang the load on the brush head of the electric toothbrush.

[0041] The testing procedure involves activating the vacuum device to evacuate the water storage chamber, activating the heating device to heat the test liquid to the test temperature, and pressing the button on the pressing device to start the electric toothbrush. Observe whether continuous bubbles emerge from the brush handle. If continuous bubbles are observed on the brush handle, the electric toothbrush is deemed to have insufficient air tightness. If no continuous bubbles are observed on the brush handle, the electric toothbrush is deemed to have passed the air tightness test.

[0042] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A dynamic air tightness testing machine for an electric toothbrush, characterized in that, The device includes a test chamber, a vacuum device, a clamp, a pressing device, a heating device, and a load. The test chamber forms a sealed water reservoir. The clamp holds the handle of the electric toothbrush. The pressing device presses a button on the handle. The load applies force to the brush head. During dynamic airtightness testing of the electric toothbrush, the clamp holds the toothbrush in the liquid within the water reservoir. The vacuum device evacuates the water reservoir. The pressing device starts or stops the toothbrush. The load applies force to the brush head to simulate the pressure-bearing working state of the brush head during brushing, thus performing dynamic airtightness testing. The heating device heats the liquid in the water reservoir.

2. The dynamic air tightness testing machine for electric toothbrushes according to claim 1, wherein, The load includes a force-applying component that can be adjusted to contact different positions of the brush head, so that the force-applying component applies force to the brush head from different angles.

3. The dynamic air tightness testing machine for electric toothbrushes according to claim 1, wherein, The load includes a connecting wire and a weight, the weight being hung on the brush head via the connecting wire.

4. The dynamic air tightness testing machine for electric toothbrushes according to claim 1, wherein, The load includes a connecting wire and a weight that generates downward gravity, the weight being movably suspended on the brush head via the connecting wire; the clamp can drive the brush handle to rotate axially, thereby allowing the downward gravity of the weight to be applied to different angles of the brush head in a variable manner.

5. The dynamic air tightness testing machine for electric toothbrushes according to claim 1, wherein, It also includes a lifting device, on which the cover of the test chamber is mounted. The cover descends with the lifting device to seal the water storage chamber, and rises with the lifting device to open the water storage chamber. The lifting device extends into the water storage chamber and is provided with an installation plate. The clamp includes an upper clamp, a lower clamp, and a clamp driving device. The lower clamp is mounted on the installation plate. The upper clamp moves up and down above the lower clamp under the drive of the clamp driving device, so that the brush handle is clamped between the upper clamp and the lower clamp. The pressing device is fixed on the upper clamp.

6. The dynamic air tightness testing machine for electric toothbrushes according to claim 5, wherein, The upper clamp and / or lower clamp are equipped with pressure sensors. When the pressure sensors detect that the brush handle is clamped, the clamp driving device stops driving the upper clamp.

7. The dynamic air tightness testing machine for electric toothbrushes according to claim 1, wherein It also includes a base, in which the vacuuming device is disposed, and the vacuuming device is connected to the water storage chamber through an air extraction pipe.

8. The dynamic air tightness testing machine for electric toothbrushes according to claim 1, wherein, The heating device is installed in the water storage chamber.

9. The dynamic air tightness testing machine for electric toothbrushes according to claim 8, wherein, It also includes a liquid level sensor and a temperature sensor. The liquid level sensor is installed in the water storage chamber and is used to detect the liquid level in the water storage chamber. The temperature sensor is installed in the water storage chamber and is used to sense the temperature of the liquid in the water storage chamber.

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