Nylon cleaning bristle and application of bristle to electric dental scaler

Abstract

The embodiment of the invention provides nylon cleaning bristles and application of the bristles on an electric dental scaler, and relates to the technical field of wash supplies, and the bristles are prepared from the following materials in percentage by mass: 85%-95% of nylon, 3%-8% of a nanoscale titanium dioxide antibacterial agent, 1%-5% of an ethylene-vinyl acetate copolymer (EVA) flexibilizer and 0.5%-1.5% of an antioxidant 1010. The antibacterial and antioxidant effects of the bristles are improved.

Description

Technical Field

[0001] This invention relates to the field of personal care products, and in particular to a nylon cleaning brush bristle and its application in an electric dental flosser. Background Technology

[0002] In existing technologies, the bristles of dental flossers are mainly made of nylon, PP, and PET, but each has its own defects. For example, nylon bristles have insufficient antibacterial properties and are prone to bacterial growth; PP bristles are too hard and can easily damage the gums; PET bristles have poor resilience and a short lifespan.

[0003] In addition, traditional brush bristles lack innovation in material formulation, making it difficult to meet consumers' needs for efficient cleaning, safety, and comfort. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a nylon cleaning brush bristle and its application in an electric dental flosser.

[0005] Firstly, this application provides a nylon cleaning brush with bristles, employing the following technical solution:

[0006] A nylon cleaning brush bristles, the bristles being composed of the following materials in weight percentages: 85%-95% nylon, 3%-8% nano-grade titanium dioxide antibacterial agent, 1%-5% ethylene-vinyl acetate copolymer (EVA) toughening agent, and 0.5%-1.5% antioxidant 1010.

[0007] Furthermore, the nano-sized titanium dioxide antibacterial agent has a particle size of 20-50 nanometers and a specific surface area of ​​50-100 m². 2 / g, the content of vinyl acetate (VA) in the ethylene-vinyl acetate copolymer (EVA) toughening agent is 18%-28%.

[0008] Secondly, this application provides an electric dental flosser using the aforementioned nylon cleaning bristles, employing the following technical solution:

[0009] An electric dental flosser includes a housing, a brush head, and a drive motor disposed within the housing. The nylon cleaning bristles are fixed to the brush head. The device also includes a first spiral bevel gear and a second spiral bevel gear. The brush head is detachably connected to the second spiral bevel gear, and the first and second spiral bevel gears mesh. A transmission component is fixed to the output shaft of the drive motor. The first spiral bevel gear is coaxially connected to the end of the transmission component. A sweeping device is disposed within the housing to drive the brush head to sweep back and forth. The transmission component is provided with a conversion device that allows the drive motor to drive the first spiral bevel gear to rotate and the sweeping device to move.

[0010] Furthermore, the sweeping device includes a connector disposed on the end face of the second spiral bevel gear. An arc-shaped groove is formed in the connector, and a rotating block is rotatably connected in the arc-shaped groove. A threaded hole is formed on the rotating block. A threaded rod is coaxially fixed on the brush head. The threaded rod is threadedly connected in the threaded hole. An abutment cylinder with its end abutting against the end face of the second spiral bevel gear is sleeved on the connector. The abutment cylinder is threadedly connected in the housing and prevents the second spiral bevel gear from disengaging from the housing. The sweeping device also includes a sweeping mechanism that drives the rotating block to sweep back and forth by a drive motor.

[0011] Furthermore, the sweeping mechanism includes two rotating shafts coaxially fixed on the rotating block, the rotating shafts being rotatably connected to the connecting member, a sliding rod parallel to the rotating shafts being fixed on the rotating block, a sliding block being slidably disposed on the sliding rod, a driving rod being fixed on the sliding block, the second spiral bevel gear being coaxially and rotatably connected to a driving shaft passing through the second spiral bevel gear, a driving plate perpendicular to the driving shaft being fixed at the end of the driving shaft extending into the connecting member, the driving rod perpendicularly passing through the driving plate, the driving rod and the driving plate being rotatably and slidably connected, during the process of the driving shaft driving the driving plate to rotate, the driving plate driving the driving rod to rotate around the driving shaft, during the rotation process the driving rod slides on the driving plate and drives the rotating block to swing back and forth.

[0012] Furthermore, the conversion device includes a transmission rod coaxially and slidably disposed within the transmission component, the first spiral bevel gear being coaxially and rotatably connected to the transmission component, the transmission rod passing through the first spiral bevel gear, a transmission gear being coaxially fixed on the transmission rod, and the first spiral bevel gear having a transmission tooth groove meshing with the transmission gear. The conversion device also includes a conversion mechanism that drives the transmission rod to slide and causes the transmission rod to drive the drive shaft to rotate.

[0013] Furthermore, the conversion mechanism includes a drive bevel gear coaxially fixed to the end of the drive shaft. A mounting component is fixed on the housing and rotatably connected to and sleeved on the second spiral bevel gear. A transmission bevel gear meshing with the drive bevel gear is rotatably connected to the mounting component. A synchronizing gear is coaxially fixed on the shaft of the transmission bevel gear. The transmission bevel gear is coaxial with the transmission rod. A receiving groove sleeved on the synchronizing gear is opened at the upper end of the transmission rod. A synchronizing tooth groove is opened on the bottom side wall of the receiving groove. When the transmission rod moves upward, the transmission gear separates from the transmission tooth groove, and the synchronizing tooth groove gradually sleeves on the outside of the synchronizing gear and drives the synchronizing gear to rotate. The conversion mechanism also includes a conversion component that drives the sliding rod to move up and down.

[0014] Furthermore, the connector has a conversion groove communicating with the internal cavity along its length. The conversion assembly includes a conversion rod fixed on the transmission rod. The end of the conversion rod protrudes outside the conversion groove and slides along the length of the conversion groove. A conversion ring is sleeved on the transmission component. The conversion ring is fixedly connected to the conversion rod and is rotatably and slidably connected to the transmission component.

[0015] Furthermore, a reset spring is sleeved on the rotating shaft to restore the rotating block to its initial position.

[0016] Furthermore, the inner wall of the connector is provided with a sliding groove, a limiting ball is slidably disposed in the sliding groove, a limiting spring is fixed in the sliding groove to connect the limiting ball and pull the limiting ball toward the sliding groove, and the inner wall of the arc-shaped groove is provided with a limiting groove for locking the limiting ball and preventing the rotating block from rotating relative to the connector.

[0017] In summary, this application includes at least one of the following beneficial technical effects: Before and during brushing, the user can select the brushing mode through the switching device; the drive motor drives the first and second spiral bevel gears to rotate, thereby driving the brush head connected to the second spiral bevel gear to rotate; through the switching mechanism, the transmission rod drives the drive shaft to rotate; the drive shaft drives the drive plate and drive rod to rotate; the drive rod drives the rotating block to sweep back and forth, thereby realizing the sweeping brushing function. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0019] Figure 2 This is an exploded view of the brush head connection.

[0020] Figure 3 This is a cross-sectional view of the overall internal structure of an embodiment of this application.

[0021] Figure 4 This is a cross-sectional view of the sweeping device according to an embodiment of this application.

[0022] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Brush head; 3. First spiral bevel gear; 4. Second spiral bevel gear; 5. Transmission component; 6. Connecting component; 7. Arc groove; 8. Rotating block; 9. Threaded hole; 10. Threaded rod; 11. Abutment cylinder; 12. Rotating shaft; 13. Sliding rod; 14. Sliding block; 15. Drive rod; 16. Drive shaft; 17. Drive plate; 18. Transmission rod; 19. Transmission gear; 20. Drive bevel gear; 21. Transmission bevel gear; 22. Synchronizing gear; 23. Mounting component; 24. Conversion groove; 25. Conversion rod; 26. Conversion ring; 27. Return spring; 28. Sliding groove; 29. ​​Limiting ball; 30. Limiting groove. Detailed Implementation

[0023] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of this application, “at least one” and “one or more” refer to one, two, or more than two. The term “and / or” is used to describe the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can indicate: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character “ / ” generally indicates that the preceding and following related objects are in an “or” relationship.

[0024] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0025] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0026] This application discloses a nylon cleaning brush bristles, the bristles being composed of the following materials by weight percentage: 85%-95% nylon, 3%-8% nano-grade titanium dioxide antibacterial agent, 1%-5% ethylene-vinyl acetate copolymer (EVA) toughening agent, and 0.5%-1.5% antioxidant 1010. The nano-grade titanium dioxide antibacterial agent has a particle size of 20-50 nanometers and a specific surface area of ​​50-100 m². 2 / g, the vinyl acetate (VA) content in the ethylene-vinyl acetate copolymer (EVA) toughening agent is 18%-28%.

[0027] After the components are mixed evenly in proportion, they are melt-extruded at 250-270℃ and spun into shape through spinnerets with a diameter of 0.15-0.25mm. The product is cooled by a combination of air cooling and water cooling, with the air cooling temperature being 15-25℃ and the water cooling temperature being 10-20℃. After stretching and shaping, the finished product is obtained.

[0028] Specifically, the composition is 90% nylon, 5% nano titanium dioxide, 3% EVA as toughening agent, 1.5% antioxidant 1010, and 0.5% fluorescent whitening agent OB-1. The mixing temperature is 255℃, the screw speed is 180r / min, the spinneret diameter is 0.18mm, the air cooling temperature is 22℃, and the water cooling temperature is 18℃.

[0029] Beneficial effects:

[0030] Antibacterial properties: Nano-grade titanium dioxide antibacterial agent has broad-spectrum antibacterial effects, with an inhibition rate of over 99% against common oral bacteria such as Escherichia coli and Staphylococcus aureus.

[0031] Physical properties: By adding EVA toughening agent, the elongation at break of the bristles is increased to 400%-500%, and the resistance to bending fatigue is improved by more than 30%.

[0032] Aging resistance: The addition of antioxidant 1010 effectively delays the oxidative degradation of the material. Accelerated aging tests show that the color stability and mechanical property retention of the bristles are improved by more than 50%.

[0033] This application also discloses an electric dental flosser that uses the aforementioned nylon cleaning bristles, see reference 1 Figure 1 and Figure 2 It includes a housing 1, a brush head 2, and a first spiral bevel gear 3, a second spiral bevel gear 4, a drive motor, a transmission component 5, a sweeping device, and a conversion device disposed within the housing 1. The aforementioned nylon cleaning bristles are fixed to the brush head.

[0034] Reference Figure 1 and Figure 2 The first spiral bevel gear 3 meshes with the second spiral bevel gear 4. The brush head 2 is detachably connected to the second spiral bevel gear 4. The output shaft of the drive motor is coaxially and fixedly connected to the transmission component 5. The first spiral bevel gear 3 is coaxially connected to the end of the transmission component 5 away from the drive motor. The sweeping device is used to control the brush head 2 to sweep back and forth. The first spiral bevel gear 3 and the second spiral bevel gear 4 are used to control the brush head 2 to rotate around its own axis. The conversion device is set to control the drive motor, so that the drive motor drives the brush head 2 to rotate or makes the brush head 2 to sweep back and forth.

[0035] Reference Figure 2 and Figure 3The sweeping device includes a connector 6 fixed to the end face of the second spiral bevel gear 4. An arc-shaped groove 7 is provided in the connector 6. A rotating block 8 is rotatably connected in the arc-shaped groove 7. The outer wall of the arc-shaped groove 7 and the rotating block 8 are located on the same spherical surface. The rotating block 8 can rotate freely in the arc-shaped groove 7. A threaded hole 9 is provided on the end face of the rotating block 8. A coaxial threaded rod 10 is fixed on the brush head 2. The threaded rod 10 is threadedly connected in the threaded hole 9, which facilitates the installation and replacement of the brush head 2. An abutment cylinder 11 is provided on the outer sleeve of the connector 6. The end of the abutment cylinder 11 abuts against the end face of the second spiral bevel gear 4 and is rotatably connected to the second spiral bevel gear 4. The outer wall of the abutment cylinder 11 is threadedly connected to the inner wall of the housing 1 to prevent the second spiral bevel gear 4 from detaching from the housing 1.

[0036] Reference Figure 2 and Figure 3 The sweeping device also includes a sweeping mechanism that drives the rotating block 8 to sweep back and forth via a drive motor. The sweeping mechanism includes two rotating shafts 12 coaxially fixed on the rotating block 8. The rotating shafts 12 are rotatably connected to the connecting member 6. The rotating shafts 12 are used to limit the rotation direction of the rotating block 8, thereby limiting the direction in which the sweeping device drives the brush head 2 to sweep back and forth. A sliding rod 13 parallel to the rotating shaft 12 is fixed on the rotating block 8. A sliding block 14 is sleeved on the sliding rod 13. The sliding block 14 is rotatably and slidably connected to the sliding rod 13. A drive rod 15 perpendicular to the sliding rod 13 is fixed on the sliding block 14. The second spiral bevel gear 4 is coaxial and rotates... A drive shaft 16 is dynamically connected, and the drive shaft 16 passes through the second spiral bevel gear 4. A drive plate 17 is fixed at the end of the drive shaft 16 that extends into the connector 6. The drive plate 17 is perpendicular to the drive shaft 16. The drive rod 15 is parallel to the drive shaft 16 and passes through the drive plate 17 perpendicularly. The drive rod 15 and the drive plate 17 are rotatably and slidably connected. During the process of the drive shaft 16 driving the drive plate 17 to rotate, the drive plate 17 drives the drive rod 15 to rotate around the drive shaft 16. During the rotation of the drive rod 15, it slides relative to the drive plate 17 and drives the rotating block 8 to swing back and forth, thereby changing the movement mode of the brush head 2 to meet the needs of different brushing methods.

[0037] Reference Figure 3 and Figure 4 The conversion device includes a transmission rod 18 coaxially disposed within the transmission component 5. The transmission rod 18 is slidably disposed within the transmission component 5. The first spiral bevel gear 3 is coaxially and rotatably connected to the transmission component 5. The transmission rod 18 passes through the first spiral bevel gear 3. A transmission gear 19 is coaxially fixed on the transmission rod 18. A transmission tooth groove is provided on the upper end face of the first spiral bevel gear 3. When the transmission rod 18 moves downward and the transmission gear 19 meshes with the transmission tooth groove, the drive motor drives the transmission component 5, the transmission rod 18 and the first spiral bevel gear 3 to rotate.

[0038] Reference Figure 3 and Figure 4The conversion device also includes a conversion mechanism that drives the transmission rod 18 to slide and causes the transmission rod 18 to drive the drive shaft 16 to rotate. The conversion mechanism includes a drive bevel gear 20 coaxially fixed to the end of the drive shaft 16. A mounting part 23 is fixed on the housing 1. The mounting part 23 is sleeved on the second spiral bevel gear 4 and rotatably connected to the second spiral bevel gear 4. A transmission bevel gear 21 is rotatably connected to the mounting part 23. The transmission bevel gear 21 meshes with the drive bevel gear 20. A synchronous gear 22 is coaxially fixed on the shaft of the transmission bevel gear 21. The transmission bevel gear 21 is coaxial with the transmission rod 18. A storage groove is opened at the upper end of the transmission rod 18. The synchronous gear 22 is located in the storage groove. The inner side wall of the bottom of the storage groove is opened. With synchronous tooth grooves, the transmission rod 18 moves upward, the transmission gear 19 separates from the transmission tooth groove, the transmission rod 18 continues to move upward, the synchronous gear 22 meshes with the synchronous tooth groove, the drive motor transmission component 5 and the transmission rod 18 rotate, the transmission rod 18 drives the drive shaft 16 to rotate through the synchronous gear 22 and the synchronous tooth groove, so that the drive shaft 16 acts on the brush head 2 through the drive plate 17 and the drive rod 15, causing the brush head 2 to sweep back and forth. In order to facilitate the meshing of the transmission gear 19 with the transmission tooth groove and the synchronous gear 22 with the synchronous tooth groove, the opening position of the transmission tooth groove and the synchronous tooth groove is designed as an arc-shaped trumpet opening, so that the transmission gear 19 and the synchronous gear 22 can be inserted into the corresponding transmission tooth groove and the synchronous tooth groove.

[0039] Reference Figure 3 and Figure 4 The conversion mechanism also includes a conversion component that drives the sliding rod 13 to move up and down. The connecting member 6 has a conversion groove 24 along its length, which communicates with the internal cavity of the connecting member 6. The conversion component includes a conversion rod 25 fixed on the transmission rod 18. The end of the conversion rod 25 protrudes out of the conversion groove 24 and slides along the length of the conversion groove 24, thereby controlling the movement of the transmission rod 18. A conversion ring 26 is sleeved on the transmission member 5 and is fixedly connected to the conversion rod 25. The conversion ring 26 and the transmission member 5 are rotatably and slidably connected. A drive block protruding out of the housing 1 is fixed on the conversion rod 25. By pushing and pulling the drive block, the conversion ring 26 and the conversion rod 25 are driven to move, thereby controlling the movement of the transmission rod 18.

[0040] Reference Figure 3 and Figure 4 A return spring 27 is fitted on the rotating shaft 12. The return spring 27 connects the rotating shaft 12 and the connecting piece 6, and restores the rotating block 8 to the starting position, ensuring that the end face of the brush head 2 is parallel to the handle, and also ensuring that the bristles are perpendicular to the tooth surface.

[0041] Reference Figure 3 and Figure 4The inner wall of the connector 6 is provided with a sliding groove 28, a limiting ball 29 is slidably disposed in the sliding groove 28, a limiting spring is fixed in the sliding groove 28, one end of the limiting spring is connected to the bottom of the sliding groove 28, and the other end of the limiting groove 30 is fixed on the limiting ball 29 and pulls the limiting ball 29 toward the sliding groove 28. The inner wall of the arc groove 7 is provided with a limiting groove 30 for engaging the limiting ball 29.

[0042] When the brush head 2 rotates at a relatively slow speed, the limiting ball 29 is located in the limiting groove 30. At this time, during brushing, the end face of the brush head 2 can adjust its tilt angle. When the brush head 2 rotates at a higher speed, under the action of centrifugal force, the limiting ball 29 is partially engaged in the limiting groove 30, locking the rotating block 8 to prevent damage to the gums due to excessive speed or the rotation of the brush head 2.

[0043] The implementation principle of this application embodiment is as follows: During brushing, the user can select the brushing mode through the switching device. The drive motor drives the first spiral bevel gear 3 and the second spiral bevel gear 4 to rotate, thereby driving the brush head 2 connected to the second spiral bevel gear 4 to rotate. When rotating at low speed, the brush head 2 can rotate relative to each other, which is convenient for cleaning hard-to-reach areas. During high-speed rotation, the brush head 2 is locked to prevent the brush head 2 from rotating and injuring the gums. When it is necessary to switch modes, the drive block acts on the switching ring 26 and the switching rod 25, which drives the transmission rod 18 to slide. The transmission gear 19 separates from the transmission tooth groove, the first spiral bevel gear 3 stops rotating, and the transmission rod 18 continues to move. The synchronous gear 22 meshes with the synchronous tooth groove, which drives the drive shaft 16 to rotate. The drive shaft 16 drives the drive plate 17 to rotate. As the drive plate 17 drives the sliding block 14 to slide on the sliding rod 13, it drives the upper rotating block 8 and the brush head 2 to sweep back and forth to meet the needs of different brushing methods.

[0044] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. Any equivalent modifications or variations made by those skilled in the art based on the content disclosed in the present invention should be included within the scope of protection set forth in the claims.

Claims

1. A nylon cleaning brush bristles, characterized in that, The bristles are composed of the following materials by weight percentage: 85%-95% nylon, 3%-8% nano-grade titanium dioxide antibacterial agent, 1%-5% ethylene-vinyl acetate copolymer (EVA) toughening agent, and 0.5%-1.5% antioxidant 1010.

2. The nylon cleaning brush bristles according to claim 1, characterized in that, The nano-sized titanium dioxide antibacterial agent has a particle size of 20-50 nanometers and a specific surface area of ​​50-100 m². 2 / g, the content of vinyl acetate (VA) in the ethylene-vinyl acetate copolymer (EVA) toughening agent is 18%-28%.

3. An electric dental flosser, characterized in that, Made of nylon cleaning bristles as described in any one of claims 1-2, the brush head (2) includes a housing (1), a brush head (2), and a drive motor disposed within the housing (1). The nylon cleaning bristles are fixed on the brush head (2). The brush head (2) also includes a first spiral bevel gear (3) and a second spiral bevel gear (4). The brush head (2) is detachably connected to the second spiral bevel gear (4). The first spiral bevel gear (3) and the second spiral bevel gear (4) mesh. A transmission component (5) is fixed on the output shaft of the drive motor. The first spiral bevel gear (3) is coaxially connected to the end of the transmission component (5). A sweeping device is provided inside the housing (1) to drive the brush head (2) to sweep back and forth. A conversion device is provided on the transmission component (5) to enable the drive motor to drive the first spiral bevel gear (3) to rotate and the sweeping device to move.

4. An electric dental flosser according to claim 3, characterized in that, The sweeping device includes a connector (6) disposed on the end face of the second spiral bevel gear (4). An arc groove (7) is provided in the connector (6). A rotating block (8) is rotatably connected in the arc groove (7). A threaded hole (9) is provided on the rotating block (8). A threaded rod (10) is coaxially fixed on the brush head (2). The threaded rod (10) is threadedly connected in the threaded hole (9). An abutment cylinder (11) with its end abutting against the end face of the second spiral bevel gear (4) is provided on the connector (6). The abutment cylinder (11) is threadedly connected in the housing (1) and prevents the second spiral bevel gear (4) from disengaging from the housing (1). The sweeping device also includes a sweeping mechanism that drives the rotating block (8) to sweep back and forth by a drive motor.

5. An electric dental flosser according to claim 4, characterized in that, The sweeping mechanism includes two rotating shafts (12) coaxially fixed on the rotating block (8). The rotating shafts (12) are rotatably connected to the connecting member (6). A sliding rod (13) parallel to the rotating shafts (12) is fixed on the rotating block (8). A sliding block (14) is slidably disposed on the sliding rod (13). A drive rod (15) is fixed on the sliding block (14). The second spiral bevel gear (4) is coaxially and rotatably connected to a drive shaft (16) that passes through the second spiral bevel gear (4). (16) A drive plate (17) perpendicular to the drive shaft (16) is fixed at the end extending into the connector (6). The drive rod (15) passes through the drive plate (17) perpendicularly. The drive rod (15) and the drive plate (17) are rotatable and slidably connected. During the rotation of the drive shaft (16) and the drive plate (17), the drive plate (17) drives the drive rod (15) to rotate around the drive shaft (16). During the rotation, the drive rod (15) slides on the drive plate (17) and drives the rotating block (8) to swing back and forth.

6. An electric dental flosser according to claim 5, characterized in that, The conversion device includes a transmission rod (18) that is coaxially and slidably disposed within the transmission member (5). The first spiral bevel gear (3) is coaxially and rotatably connected to the transmission member (5). The transmission rod (18) passes through the first spiral bevel gear (3). A transmission gear (19) is coaxially fixed on the transmission rod (18). The first spiral bevel gear (3) has a transmission tooth groove that meshes with the transmission gear (19). The conversion device also includes a conversion mechanism that drives the transmission rod (18) to slide and causes the transmission rod (18) to drive the drive shaft (16) to rotate.

7. An electric dental flosser according to claim 6, characterized in that, The conversion mechanism includes a drive bevel gear (20) coaxially fixed to the end of the drive shaft (16). A mounting part (23) is fixed on the housing (1) and rotatably connected to the second spiral bevel gear (4) and sleeved on the second spiral bevel gear (4). A transmission bevel gear (21) meshing with the drive bevel gear (20) is rotatably connected to the mounting part (23). A synchronous gear (22) is coaxially fixed on the shaft of the transmission bevel gear (21). The transmission bevel gear (21) is coaxial with the transmission rod (18). A receiving groove is opened at the upper end of the transmission rod (18) and sleeved on the synchronous gear (22). A synchronous tooth groove is opened on the bottom side wall of the receiving groove. When the transmission rod (18) moves upward, the transmission gear (19) separates from the transmission tooth groove, and the synchronous tooth groove gradually sleeves on the synchronous gear (22) and drives the synchronous gear (22) to rotate. The conversion mechanism also includes a conversion component that drives the sliding rod (13) to move up and down.

8. An electric dental flosser according to claim 7, characterized in that, The connector (6) has a conversion groove (24) communicating with the internal cavity along its length. The conversion assembly includes a conversion rod (25) fixed on the transmission rod (18). The end of the conversion rod (25) protrudes outside the conversion groove (24) and slides along the length of the conversion groove (24). A conversion ring (26) is sleeved on the transmission member (5). The conversion ring (26) is fixedly connected to the conversion rod (25). The conversion ring (26) is rotatably and slidably connected to the transmission member (5).

9. An electric dental flosser according to claim 8, characterized in that, A reset spring (27) is fitted on the rotating shaft (12) to restore the rotating block (8) to its starting position.

10. An electric dental flosser according to claim 9, characterized in that, The inner wall of the connector (6) is provided with a sliding groove (28), and a limiting ball (29) is slidably arranged in the sliding groove (28). A limiting spring is fixed in the sliding groove (28) to connect the limiting ball (29) and pull the limiting ball (29) toward the sliding groove (28). The inner wall of the arc groove (7) is provided with a limiting groove (30) for locking the limiting ball (29) and preventing the rotating block (8) from rotating relative to the connector (6).

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