Bidirectional vibration sweeping electric toothbrush

Abstract

The invention discloses a bidirectional vibration sweeping electric toothbrush, which belongs to the technical field of oral care appliances, and comprises a shell, a driving module arranged in the shell, a control module and a brush head driven by the driving module, the control module is configured to have at least three working modes and can respond to user operation to be switched among the at least three working modes. Wherein the at least three working modes comprise a first vibration sweeping mode in which only the first motor works, a second vibration sweeping mode in which only the second motor works, and an automatic vibration sweeping mode in which the first motor and the second motor alternately operate according to a preset rule; according to the invention, the two independent driving motors, namely the first motor and the second motor, are arranged and matched with the control module capable of switching multiple working modes, so that the technical problem that two types of motions cannot be completely independent, do not interfere with each other and can work in the optimal state in a traditional single-motor scheme is solved; and a hardware basis is provided for diversified and personalized oral cavity cleaning.

Description

Technical Field

[0001] This invention relates to the field of oral care appliances, and in particular to a bidirectional vibrating electric toothbrush. Background Technology

[0002] As people pay increasing attention to oral health, electric toothbrushes are becoming increasingly popular due to their high cleaning efficiency and ease of use. Currently, the mainstream electric toothbrushes on the market are mainly divided into rotary and sonic toothbrushes based on the brush head's movement method. Rotary toothbrushes use a motor to drive the brush head in a circular motion, while sonic toothbrushes use a motor to drive the brush head to produce high-frequency reciprocating linear vibrations. While both technologies are effective, their movement patterns are relatively simple, primarily focusing on cleaning in a single direction.

[0003] Different areas of the mouth require different cleaning methods. For example, when cleaning the buccal surfaces and gingival sulci, horizontal brushing (such as the Bass brushing technique) is most effective; while when cleaning the pits and fissures and proximal surfaces of the occlusal surfaces, vertical tapping or vibration is more effective at removing residue. Existing single-motor electric toothbrushes cannot allow users to switch between these two different cleaning modes independently and thoroughly, and it is even more difficult to achieve automated alternation, thus showing significant shortcomings in achieving personalized, precise, and zoned cleaning. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a bidirectional vibrating electric toothbrush, which aims to solve the problems in the background art.

[0005] To achieve the above-mentioned objectives, the first aspect of the present invention provides a bidirectional vibrating electric toothbrush, comprising a housing, a drive module disposed within the housing, a control module, and a brush head driven by the drive module. The drive module includes a first motor for driving the brush head to vibrate along a first direction, and a second motor for driving the brush head to vibrate along a second direction different from the first direction. The control module is configured to have at least three operating modes and can switch between the at least three operating modes in response to user operation. The at least three operating modes include: a first vibration sweeping mode in which only the first motor operates, a second vibration sweeping mode in which only the second motor operates, and an automatic vibration sweeping mode in which the first motor and the second motor operate alternately according to a preset rule.

[0006] Optionally, the first direction is horizontal and the second direction is vertical; The first sweeping mode is used to simulate the Bass brushing technique for cleaning tooth surfaces, and the second sweeping mode is used to clean tooth crowns.

[0007] Optionally, in the automatic vibration sweeping mode, the control module controls the first motor and the second motor to run alternately at a fixed time interval.

[0008] Optionally, it also includes a transmission mechanism and a support structure disposed within the housing; The transmission mechanism includes a lateral sweeping component that converts the output of the first motor into a lateral sweeping motion of the brush head, and a longitudinal drive component that converts the output of the second motor into a longitudinal oscillation motion of the lateral sweeping component.

[0009] Optionally, the lateral sweeping assembly includes a swing arm, a swing arm shaft, and a bearing. The swing arm is oscillatingly mounted via the bearing and the swing arm shaft and is driven to the brush head. The output of the first motor is linked to the swing arm through the first eccentric sleeve.

[0010] Optionally, the lateral sweeping assembly further includes a swing arm cap sleeved on the end of the swing arm, and a linear swing arm that cooperates with the swing arm for constraining and transmitting the motion trajectory. The linear swing arm is equipped with a buckle for fixing the power output shaft, and the power output shaft is...

[0011] Optionally, the longitudinal drive assembly includes a second eccentric sleeve mounted on the output shaft of the second motor, the second eccentric sleeve contacting the transverse sweeping assembly or the support structure to convert the rotational motion of the second motor into a periodic longitudinal excitation force. The second eccentric sleeve is provided with a limiting shaft to ensure the stability of the drive.

[0012] Optionally, the support structure includes a motor bracket, the second motor is fixedly mounted on the motor bracket, and the first motor is fixedly mounted on the main bracket; The transmission mechanism also includes a power output shaft, a bearing cover sleeved on the power output shaft, and a transmission shaft cover for pressing the power output shaft.

[0013] Optionally, the housing also includes a main bracket for securing internal components, on which a battery for powering the drive module and control module, as well as a wireless charging coil and its coil cover, are mounted.

[0014] Optionally, the housing includes a removable top cover, the top of which is fitted with a waterproof ring located on the outer wall of the power take-off shaft; The control module is integrated on the control board, and the outer casing is provided with buttons that are connected to the control board.

[0015] The beneficial effects of this invention are: 1. The bidirectional vibrating electric toothbrush of this invention, by setting up two independent drive motors (a first motor and a second motor) and cooperating with a control module that can switch between multiple working modes, fundamentally realizes truly independent and controllable active vibrating motion of the brush head in two different directions. Users can choose to perform deep cleaning in only one direction, or choose a composite cleaning mode where the device controls the automatic alternation of the two directions. This solves the technical problem of traditional single-motor solutions being unable to achieve completely independent, non-interfering, and optimal operation of the two movements, providing a hardware foundation for diversified and personalized oral hygiene.

[0016] 2. The bidirectional vibrating electric toothbrush of this invention, by defining the first direction as transverse to simulate the Bass brushing technique and the second direction as longitudinal to clean the tooth crown, gives the two vibration modes clear clinical cleaning functions. Users can intuitively select the most suitable mechanical motion mode according to different parts of the teeth (such as the gingival area or the occlusal surface of the molars), realizing an upgrade from general cleaning to precise zonal cleaning, significantly improving the targeting and effectiveness of cleaning.

[0017] 3. The bidirectional sweeping electric toothbrush of the present invention, by setting an automatic sweeping mode and controlling two motors to run alternately at fixed time intervals (e.g., 30 seconds), can automatically guide the user to perform balanced horizontal brushing and vertical vibration during a single brushing session. This ensures that all areas of the oral cavity receive targeted cleaning, eliminating the need for manual timing and switching, thus improving the scientific nature and convenience of the brushing process and helping to cultivate comprehensive and balanced brushing habits.

[0018] 4. The bidirectional sweeping electric toothbrush of the present invention employs a composite transmission mechanism including a transverse sweeping component and a longitudinal drive component, which efficiently and reliably converts the rotational motion of two motors into mechanical sweeping in two dimensions. This modular transmission design makes the transmission path of bidirectional motion clear, the structure compact, and the motion generation and transmission mechanisms in the two directions relatively independent and do not interfere with each other, ensuring the purity and efficiency of each motion mode. Attached Figure Description

[0019] Figure 1 This is an exploded schematic diagram of the bidirectional vibrating electric toothbrush of the present invention; Figure 2 This is a schematic diagram of the overall assembly of the bidirectional vibration-damping electric toothbrush of the present invention; Figure 3 This is a schematic diagram of the outer shell of the bidirectional vibrating electric toothbrush of the present invention after disassembly. Figure 4 This is a partial structural schematic diagram of the bidirectional vibrating electric toothbrush of the present invention; Figure 5This is a schematic diagram of the first and second motor drive structures of the bidirectional vibrating electric toothbrush of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1. Outer shell; 2. Brush head; 3. First motor; 4. Second motor; 5. Swing arm; 6. Swing arm shaft; 7. Bearing; 8. Swing arm cap; 9. Linear swing arm; 101. First eccentric sleeve; 102. Second eccentric sleeve; 11. Motor bracket; 12. Bearing cover; 13. Drive shaft cover; 14. Battery; 15. Wireless charging coil; 16. Coil cover; 17. Top cover; 18. Waterproof ring; 19. Control board; 20. Button; 21. Main bracket; 22. Buckle; 23. Limiting shaft.

[0021] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] Reference Figures 1-5 An embodiment of the present invention provides an embodiment of a bidirectional vibrating electric toothbrush, including a housing 1, a drive module disposed within the housing 1, a control module, and a brush head 2 driven by the drive module. The drive module includes a first motor 3 for driving the brush head 2 to vibrate along a first direction, and a second motor 4 for driving the brush head 2 to vibrate along a second direction different from the first direction. The control module is configured to have at least three operating modes and can switch between the at least three operating modes in response to user operation. The at least three operating modes include: a first vibrating mode in which only the first motor 3 operates, a second vibrating mode in which only the second motor 4 operates, and an automatic vibrating mode in which the first motor 3 and the second motor 4 operate alternately according to a preset rule.

[0025] In some embodiments, the device further includes a transmission mechanism and a support structure disposed within the housing 1; the transmission mechanism includes a transverse sweeping component that converts the output of the first motor 3 into a transverse sweeping motion of the brush head 2, and a longitudinal driving component that converts the output of the second motor 4 into a longitudinal oscillating motion of the transverse sweeping component.

[0026] This embodiment of the bidirectional vibrating electric toothbrush mainly includes: a housing 1, a drive module, a control module, a transmission mechanism, a support structure, and a brush head 2 driven by the drive module, all housed within the housing 1. The drive module is the core for generating power and integrates two independent micro-motors: a first motor 3 and a second motor 4. The first motor 3 is specifically responsible for driving the brush head 2 to perform high-frequency reciprocating sweeping along a first direction (e.g., the left-right direction parallel to the bristle arrangement surface, i.e., the transverse direction). The second motor 4 is specifically responsible for driving the brush head 2 to perform reciprocating oscillation or vibration along a second direction (e.g., the front-back direction perpendicular to the bristle arrangement surface, i.e., the longitudinal direction). The movements in the two directions are independent and can be controlled separately.

[0027] The control module is typically integrated onto a control board 19, which has pre-stored its program. It is configured to manage at least three operating modes and can respond to user switching operations via buttons 20 on the housing 1. The three modes include: First vibration sweeping mode: The control module only starts the first motor 3, and the second motor 4 does not work.

[0028] Second vibration sweeping mode: The control module only starts the second motor 4, and the first motor 3 does not work.

[0029] Automatic vibration sweeping mode: The control module automatically controls the first motor 3 and the second motor 4 to run alternately according to the preset logic.

[0030] Employing a dual-motor independent drive architecture, this design fundamentally solves the technical challenge of achieving high-quality, pure bidirectional independent sweeping vibration with a single motor. The two motors can be precisely and independently controlled, avoiding efficiency losses or trajectory deviations caused by motion coupling, thus laying the hardware foundation for various targeted cleaning modes. Users can choose single-direction deep cleaning or have the device automatically execute composite cleaning programs, offering a high degree of intelligence and personalization.

[0031] Furthermore, to achieve the aforementioned bidirectional movement, the electric toothbrush is equipped with a precise transmission mechanism and a stable support structure.

[0032] The transmission mechanism mainly consists of two components: Lateral sweeping component: Its function is to convert the high-speed rotation of the first motor 3 into precise lateral linear or arc reciprocating motion of the brush head 2.

[0033] Longitudinal drive assembly: Its function is to convert the rotational motion of the second motor 4 into a force that drives the entire transverse sweeping assembly (or the parts connected to it) to oscillate periodically in the longitudinal direction.

[0034] The support structure includes a main bracket 21 and a motor bracket 11, etc., which provide a robust and stable mounting reference for all moving parts and electronic components, ensuring the accuracy of motion transmission and reducing noise.

[0035] In some embodiments, the first direction is horizontal and the second direction is vertical; The first sweeping mode is used to simulate the Bass brushing technique for cleaning tooth surfaces, and the second sweeping mode is used to clean tooth crowns.

[0036] In a preferred embodiment of this invention, the first direction is defined as the horizontal direction and the second direction as the vertical direction.

[0037] When the first sweeping mode (horizontal sweeping mode) is selected, brush head 2 performs rapid reciprocating sweeping motions in the horizontal direction. This motion effectively "brushes" the bristles from the gingival sulcus towards the crown, precisely simulating the core movements of the Bass brushing technique. This helps remove plaque near the gingival sulcus while also massaging the gums, resulting in significant cleaning of the tooth surface.

[0038] When the second sweeping mode (longitudinal sweeping) is selected, brush head 2 performs reciprocating tapping or oscillating motions perpendicular to the tooth surface. This motion is particularly suitable for cleaning the occlusal surfaces of tooth crowns, pits and fissures, and proximal surfaces of teeth. It uses longitudinal impact force to dislodge impacted food debris and has an excellent cleaning effect on uneven tooth surface areas.

[0039] By clearly mapping the movement directions of the two motors to the most valuable horizontal brushing and vertical tapping techniques in oral cleaning, each working mode has a clear clinical significance. Users no longer simply select "strong" or "weak" settings, but can choose the most suitable mechanical movement mode based on the characteristics of different areas of the oral cavity (such as the gingival line and the occlusal surface of the molars), achieving a leap from "general brushing" to "precise zonal cleaning".

[0040] In some embodiments, in the automatic vibration sweeping mode, the control module controls the first motor 3 and the second motor 4 to run alternately at fixed time intervals.

[0041] In the automatic brushing mode, the timing unit built into the control module starts working. For example, the control module can control the first motor 3 (lateral brushing) to run for 30 seconds and then stop; then start the second motor 4 (vertical brushing) to run for 30 seconds, and then switch back to the first motor 3, repeating this cycle until brushing is finished. The "preset pattern" is not limited to a fixed time interval and can also be adjusted based on sensor feedback, but a fixed interval is the simplest and most reliable implementation method. This mode automatically integrates the advantages of two cleaning methods. It guides the user to automatically take care of both the tooth surface (lateral cleaning) and the crown fissures (vertical cleaning) during a single brushing session, ensuring comprehensive cleaning without the need for manual timing and switching, improving the scientific nature and convenience of the brushing process, and is especially suitable for users who want a one-stop comprehensive cleaning.

[0042] In some embodiments, the transverse sweeping assembly includes a swing arm 5, a swing arm shaft 6, and a bearing 7. The swing arm 5 is oscillatingly arranged via the bearing 7 and the swing arm shaft 6 and is drivenly connected to the brush head 2. The output of the first motor 3 is linked to the swing arm 5 via the first eccentric sleeve 101.

[0043] The transverse sweeping assembly also includes a swing arm cap 8 sleeved on the end of the swing arm 5, and a linear swing arm 9 that cooperates with the swing arm 5 for constraining and transmitting the motion trajectory. The linear swing arm 9 is equipped with a buckle 22 for fixing the power output shaft, and the power output shaft is...

[0044] Specifically, the lateral sweeping assembly may include a swing arm 5, a swing arm shaft 6, and a bearing 7. The swing arm 5 is mounted on the fixed swing arm shaft 6 via the bearing 7, allowing it to swing flexibly around the swing arm shaft 6. One end of the swing arm 5 can be reliably connected to the brush head 2 via a power output shaft on a snap-fit ​​22, while the other end is linked to the output of the first motor 3. For example, a first eccentric sleeve 101 is installed on the output shaft of the first motor 3. When the motor rotates, the eccentric sleeve drives the corresponding part of the swing arm 5, causing it to oscillate regularly, thereby driving the brush head 2 to achieve lateral sweeping vibration.

[0045] To further optimize the stability and transmission efficiency of the motion trajectory, a swing arm cap 8 can be fitted onto the end of the swing arm 5 to increase wear resistance and connection reliability. Simultaneously, a linear swing arm 9 can be installed to cooperate with the main swing arm 5. A clip 22 for fixing the final power output shaft can be installed inside the linear swing arm 9. This linkage structure constrains the kinematic pairs and transforms rotation into a more near-pure linear reciprocating motion, making the lateral movement of the brush head 2 smoother and its trajectory more controllable.

[0046] In some embodiments, the longitudinal drive assembly includes a second eccentric sleeve 102 mounted on the output shaft of the second motor 4. The second eccentric sleeve 102 contacts the transverse sweeping assembly or the support structure to convert the rotational motion of the second motor 4 into a periodic longitudinal excitation force. A limiting shaft 23 with a limit position is provided on the second eccentric sleeve 102 to ensure the stability of the drive.

[0047] The support structure includes a motor bracket 11, the second motor 4 is fixedly installed on the motor bracket 11, and the first motor 3 is fixedly installed on the main bracket 21; the transmission mechanism also includes a power output shaft, a bearing cover 12 sleeved on the power output shaft, and a transmission shaft cover 13 for pressing the power output shaft.

[0048] One embodiment of the longitudinal drive assembly is as follows: a second eccentric sleeve 102 is mounted on the output shaft of the second motor 4. When the second eccentric sleeve 102 rotates, its outer edge periodically presses against or pushes against a component it contacts. This contacted component can be a part of the transverse sweeping assembly (e.g., the swing arm 5 or its connected bracket), or the support structure itself used to support the transverse sweeping assembly. This periodic pressing generates an excitation force that causes the contacted component to reciprocate longitudinally (i.e., in a direction perpendicular to the transverse sweeping plane), ultimately transmitting the longitudinal motion to the brush head 2. Under the action of the limiting shaft 23, the stability of the reciprocating motion is ensured, reducing vibration and thus noise generation.

[0049] In terms of the support structure, the second motor 4 can be fixed on an independent motor bracket 11, while the first motor 3 is fixed on the main bracket 21, achieving point-to-point fixing and reducing mutual vibration interference. The transmission mechanism may also include a bearing cover 12 and a transmission shaft cover 13 for mounting and clamping the power output shaft, ensuring the concentricity of the rotating shaft system and smooth operation.

[0050] A separate second eccentric sleeve 102 is used to generate longitudinal excitation, achieving decoupling between the longitudinal and lateral drive mechanisms. This "eccentric wheel pushing" method has a simple structure, direct driving force, and can effectively generate a significant longitudinal oscillation amplitude. The design of separate motor bracket mounting and shaft cover improves the rigidity and assembly precision of the entire transmission system, ensuring that the whole machine operates smoothly and quietly, and has a longer service life, even when both motors are working simultaneously or alternately.

[0051] In some embodiments, the housing 1 is further provided with a main bracket 21 for fixing internal components. The main bracket 21 is equipped with a battery 14 for powering the drive module and the control module, as well as a wireless charging coil 15 and its coil cover 16.

[0052] The housing 1 includes a detachable top cover 17, and a waterproof ring 18 is installed on the top of the top cover 17 on the outer wall of the power output shaft; the control module is integrated on the control board 19, and the housing 1 is provided with a button 20 connected to the control board 19.

[0053] Understandably, the main support 21 is located inside the outer casing 1, serving as the core support. The battery 14, which powers the entire system, and the wireless charging coil 15, which is protected by a coil cover 16, are integrated on the main support 21. This integrated layout makes the internal structure neat and orderly, facilitating assembly.

[0054] The housing 1 typically includes a main body and a removable top cover 17. A waterproof ring 18 is provided at the top opening of the top cover 17, where the power output shaft passes through, to effectively prevent liquid from entering the machine body. The control module is integrated onto a control board 19, while buttons 20 for mode switching and power on / off are located in an easily accessible position on the housing 1 and are electrically connected to the control board 19.

[0055] The integrated design of the main support bracket 21 greatly improves the utilization of internal space and the overall structural strength. The integrated wireless charging coil 15 provides a convenient charging method.

[0056] In this invention, the first motor 3, the second motor 4, and the control board 19 are all common designs in the field and are common knowledge in the field. Therefore, no specific structural description or corresponding working principle description will be given here.

[0057] In practical use, when the user presses button 20 for the first time, the electric toothbrush turns on and enters the first sweeping and vibrating mode (horizontal). The first motor 3 operates, simulating the Bass brushing technique to clean the tooth surface and gingival sulcus. Pressing button 20 again switches to the second sweeping and vibrating mode (vertical), and the second motor 4 operates to powerfully clean the occlusal surfaces of the tooth crowns. Pressing button 20 a third time enters the automatic sweeping and vibrating mode. The control module controls the two motors to automatically switch every 30 seconds to achieve a thorough cleaning. Continuing to press the button cycles between different modes or turns off the power.

[0058] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A bidirectional oscillating electric toothbrush, comprising a housing (1), a driving module, a control module and a brush head (2) driven by the driving module, characterized in that: the driving module comprises a first motor (3) for driving the brush head (2) to oscillate in a first direction and a second motor (4) for driving the brush head (2) to oscillate in a second direction different from the first direction; the control module is configured to have at least three working modes and can switch between the at least three working modes in response to user operation, wherein the at least three working modes include a first oscillation mode in which only the first motor (3) works, a second oscillation mode in which only the second motor (4) works, and an automatic oscillation mode in which the first motor (3) and the second motor (4) alternately run according to a preset rule; the first direction is transverse, and the second direction is longitudinal; the first oscillation mode is used to simulate the cleaning of tooth surface by the Bass tooth brushing method, and the second oscillation mode is used to clean the tooth crown; in the automatic oscillation mode, the control module controls the first motor (3) and the second motor (4) to alternately run at fixed time intervals; further comprising a transmission mechanism and a support structure arranged in the housing (1); the transmission mechanism comprises a transverse sweeping assembly for converting the output of the first motor (3) into transverse sweeping of the brush head (2), and a longitudinal driving assembly for converting the output of the second motor (4) into longitudinal swinging of the transverse sweeping assembly as a whole; the transverse sweeping assembly comprises a swing rod (5), a swing rod shaft (6) and a bearing (7), the swing rod (5) is swingably arranged through the bearing (7) and the swing rod shaft (6) and is drivingly connected with the brush head (2); the output of the first motor (3) is linked with the swing rod (5) through a first eccentric sleeve (101); the transverse sweeping assembly further comprises a swing rod cap (8) sleeved on the end of the swing rod (5), and a straight swing rod (9) cooperating with the swing rod (5) for constraining and conducting the motion trajectory, the straight swing rod (9) is provided with a buckle (22) for fixing a power output shaft; the longitudinal driving assembly comprises a second eccentric sleeve (102) mounted on the output shaft of the second motor (4), the second eccentric sleeve (102) is in contact with the transverse sweeping assembly or the support structure to convert the rotary motion of the second motor (4) into periodic longitudinal excitation force; the second eccentric sleeve (102) is provided with a limiting shaft (23) for limiting the rotation angle of the second motor (4); the support structure comprises a motor support (11), the second motor (4) is fixedly mounted on the motor support (11), and the first motor (3) is fixedly mounted on a main support (21); the transmission mechanism further comprises a power output shaft, a bearing gland (12) sleeved on the power output shaft, and a transmission shaft gland (13) for pressing the power output shaft. ​ ​ 2. The dual mode oscillating electric toothbrush of claim 1 wherein, ​ ​ 3. The dual mode oscillating electric toothbrush of claim 1 wherein, ​ 4. The dual mode oscillating electric toothbrush of claim 1 wherein, ​ ​ 5. The dual mode oscillating electric toothbrush of claim 4 wherein, ​ ​ 6. The dual mode oscillating electric toothbrush of claim 5 wherein, ​ 7. The dual mode oscillating electric toothbrush of claim 5 wherein, ​ ​ 8. The dual mode shake-to-scavenge electric toothbrush of claim 7 wherein, ​ ​ 9. The dual mode oscillating electric toothbrush of claim 1 wherein, The shell (1) is internally provided with a main support (21) for fixing internal components, and the main support (21) is provided with a battery (14) for supplying power to the driving module and the control module, and a wireless charging coil (15) and a coil cover (16) thereof.

10. The dual mode oscillating electric toothbrush of claim 1 wherein, The shell (1) comprises a detachable top cover (17), and the top cover (17) is provided at the top with a waterproof ring (18) located on the outer wall of the power output shaft. The control module is integrated on a control board (19), and the shell (1) is provided with a button (20) connected with the control board (19).

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