A seal structure for a hair restorer

Abstract

The utility model provides a kind of sealing element structure of hair repairer, including shell and tool bit, shell includes detachably connected upper shell and lower shell, upper shell and lower shell are combined to form installation cavity, motor is equipped in installation cavity, shell front end is equipped with opening near tool bit, motor includes transmission shaft, tool bit includes moving knife and fixed knife, fixed knife is fixedly connected with lower shell;Sealing element is equipped between motor and opening, sealing element is respectively with upper shell and lower shell clamped to realize sealing, sealing element includes wrinkle part, connecting hole is equipped on wrinkle part with transmission shaft adaptation, transmission shaft passes through connecting hole and is movably connected with moving knife to drive moving knife reciprocating movement, prevent impurity by opening into motor and not affect the movement of moving knife by sealing element, by setting sealing element, avoid that hair and other impurities enter motor inside, prolong the service life of motor, without frequently disassembling shell to clean inside, improve work efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of hair clipper sealing technology, specifically relating to a sealing structure for a hair trimmer. Background Technology

[0002] Traditional electric hair clippers include a housing that houses a motor, which drives a blade assembly to cut hair. This blade assembly includes a wiggling blade for cutting hair and a fixed blade that works in conjunction with it. The front of the housing has an opening, creating a gap between the blade assembly and the housing. Cut hair can enter the housing through this gap, damaging the clippers during operation. Additionally, hair clippings and environmental impurities can easily enter the internal mounting cavity through the gap between the blade head and the housing, interfering with the cutting accuracy of the moving and fixed blades and even causing the motor to jam. Furthermore, in water washing or humid environments, liquid can easily seep into the motor compartment along the drive shaft, causing short circuits or corrosion. Moreover, traditional seals often rely on screws for fixing, increasing production costs and making them prone to loosening and seal failure. Utility Model Content

[0003] (1) Technical problems to be solved This invention provides a sealing structure for a hair trimmer, aiming to solve the problem that hair and impurities can easily enter the inside of the hair clippers, causing cutting failure.

[0004] (2) Technical solution This utility model provides a sealing structure for a hair trimmer, including a housing and a blade. The housing includes a detachably connected upper housing and a lower housing. The upper housing and the lower housing are combined to form a mounting cavity. A motor is installed in the mounting cavity. An opening is provided at the front end of the housing near the blade. The motor includes a drive shaft. The blade includes a moving blade and a fixed blade. The fixed blade is fixedly connected to the lower housing. A sealing element is provided between the motor and the opening. The sealing element is engaged with the upper shell and the lower shell to achieve a seal. The sealing element includes a pleated portion, and the pleated portion has a connecting hole adapted to the drive shaft. The drive shaft passes through the connecting hole and is movably connected to the moving blade to drive the moving blade to reciprocate. The sealing element prevents impurities from entering the motor through the opening without affecting the movement of the moving blade.

[0005] Furthermore, the pleated portion includes a contraction portion and a connecting port, the connecting port being located on the side near the opening, and the contraction portion extending from the connecting port to the connecting hole in a trumpet-shaped contraction.

[0006] Furthermore, the contraction section is provided with an annular boss, and the connecting hole is disposed on the annular boss.

[0007] Furthermore, the sealing element includes a connecting portion, the connecting portion includes an arc-shaped pressing edge, the upper shell is provided with a mounting slot adapted to the arc-shaped pressing edge, the arc-shaped pressing edge is engaged in the mounting slot and is interference-fitted with the upper shell, and the mounting slot is arc-shaped.

[0008] Furthermore, the connecting part also includes a flat pressing edge, the lower shell is provided with a sealing platform and a mounting base, there is a gap between the sealing platform and the mounting base, and the flat pressing edge is pressed into and engaged in the gap to form an interference fit with the lower shell.

[0009] Furthermore, the seal also includes a connecting cavity, into which a portion of the motor is inserted to save internal space.

[0010] Furthermore, the upper shell includes a neck, and the neck includes a bevel.

[0011] Furthermore, the upper shell is provided with mounting holes, and a viewing window is embedded in the mounting holes. The viewing window is circular.

[0012] Furthermore, the upper shell includes a recessed portion, and the lower shell includes a grip portion for easy gripping of the outer shell.

[0013] Furthermore, a charging assembly is provided in the mounting cavity. The charging assembly includes a first charging part and a second charging part. A second charging port is provided at the bottom of the lower shell corresponding to the second charging part. A notch is provided at the end of the upper shell away from the blade. A notch is provided at the end of the lower shell away from the blade. After the upper shell and the lower shell are assembled, the notch is provided and the notch is provided to form a charging port corresponding to the first charging part. The first charging part and the second charging part are compatible with different charging adapter connectors.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. By setting up a sealing element, hair and other impurities are prevented from entering the motor, extending the motor's service life. Frequent disassembly of the outer casing for internal cleaning is eliminated, improving work efficiency.

[0015] 2. The sealing element is designed with a flat pressing edge that is pressed into the gap and press-fitted into the lower shell with an interference fit. The arc-shaped pressing edge is pressed into the mounting slot and press-fitted into the upper shell with an interference fit. The sealing element can be fixed to the lower and upper shells without the need for additional fasteners, which reduces costs and avoids maintenance and after-sales problems caused by loose fasteners, failure or improper installation.

[0016] 3. The mounting slot of the upper shell is arc-shaped to match the shape of the arc-shaped pressure edge of the seal; at the same time, the arc-shaped mounting slot is conducive to setting a circular viewing window at the corresponding position of the upper shell; the upper shell also has an arc-shaped transition near its neck; the multiple arc-shaped settings and the circular setting of the viewing window complement each other, enhancing the overall aesthetic appearance of the product. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is an exploded view of the entire utility model.

[0019] Figure 3 This is an exploded view of the blade and outer shell of this utility model.

[0020] Figure 4 This is a schematic diagram showing the connection between the drive shaft and the cutter head of this utility model.

[0021] Figure 5 This is a schematic diagram of the sealing structure of this utility model. Figure 1 .

[0022] Figure 6 This is a schematic diagram of the sealing structure of this utility model. Figure 2 .

[0023] Figure 7 This is a schematic diagram of the upper shell structure of this utility model. Figure 1 .

[0024] Figure 8 This is a schematic diagram of the lower shell structure of this utility model. Figure 1 .

[0025] Figure 9 This is a schematic diagram showing the connection between the seal and the upper shell of this utility model.

[0026] Figure 10 This is a schematic diagram of the connection between the motor and the seal of this utility model.

[0027] Figure 11 This is an exploded view of the motor and seal of this utility model.

[0028] Figure 12 This is a schematic diagram of the upper shell structure of this utility model. Figure 2 .

[0029] Figure 13 This is an exploded view of the upper shell and viewing window of this utility model.

[0030] Figure 14 This is a schematic diagram of the lower shell structure of this utility model. Figure 2 .

[0031] Figure 15 This is a schematic diagram of the charging component structure of this utility model.

[0032] Figure 16 This is a schematic diagram of the charging port one and charging port two of this utility model.

[0033] Figure 17 This is an exploded view of the inner shell and lower shell of this utility model.

[0034] Reference numerals: 1-Outer shell, 11-Upper shell, 111-Mounting slot, 112-Neck, 1121-Bevel, 113-Mounting hole, 114-Recess, 115-Notch 1, 116-Charging port 1, 12-Lower shell, 120-Notch 2, 121-Sealing platform, 122-Mounting base, 123-Gap, 124-Grip, 125-Charging port 2, 126-Charging compartment, 127-Motor compartment, 128-Battery compartment, 129-Exposed outer compartment, 13-Mounting cavity. 14-Opening, 15-Screw, 16-Inner shell, 2-Cutter head, 21-Moving cutter, 22-Fixed cutter, 3-Seal, 31-Folded part, 311-Connecting hole, 312-Contraction part, 313-Connecting port, 314-Annular boss, 32-Connecting part, 321-Arc-shaped pressing edge, 322-Flat pressing edge, 33-Protrusion, 34-Connecting cavity, 4-Motor, 41-Drive shaft, 5-Electrical control board, 6-Charging assembly, 61-First charging part, 62-Second charging part, 7-Viewing window. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0036] like Figure 1-17 As shown, this utility model provides a sealing structure for a hair trimmer, including a housing 1 and a blade head 2. The housing 1 includes a detachably connected upper shell 11 and a lower shell 12. The upper shell 11 and the lower shell 12 are combined to form a mounting cavity 13. A motor 4 is provided in the mounting cavity 13. An opening 14 is provided at the front end of the housing 1 near the blade head 2. The motor 4 includes a drive shaft 41. The blade head 2 includes a moving blade 21 and a fixed blade 22. The fixed blade 22 is fixedly connected to the lower shell 12. The drive shaft 41 is movably connected to the moving blade 21 to drive the moving blade 21 to reciprocate, thereby cutting the hair with the fixed blade 22. Among them, such as Figure 3-4As shown, due to the gap between the outer casing 1 and the blade head 2, and the opening 14 in the outer casing 1, cut hair or other impurities can easily enter the mounting cavity 13 through the opening 14, causing damage to the motor 4 and other components during operation. This can disrupt the cutting action between the fixed blade 22 and the moving blade 21, and may even cause the motor 4 to jam due to excessive impurities, making hair trimming impossible. Therefore, frequent disassembly of the blade head 2 and the outer casing 1 is required for cleaning, severely shortening the lifespan of the hair trimmer. To avoid the above situation, a sealing element 3 is provided between the motor 4 and the opening 14. The sealing element 3 is a flexible sealing element 3, which is divided into... The sealing element 3 is sealed by engaging with the upper shell 11 and the lower shell 12. The sealing element 3 includes a pleated portion 31, which has a connecting hole 311 adapted to the drive shaft 41. The drive shaft 41 passes through the connecting hole 311 and is movably connected to the moving blade 21 to drive the moving blade 21 to reciprocate. The sealing element 3 prevents impurities from entering the motor 4 through the opening 14 without affecting the movement of the moving blade 21. This ensures that the components in the outer shell 1 are only allowed to be movably connected to the moving blade 21 through the connecting hole 311, and other impurities such as hair and water are not allowed to enter the mounting cavity 13 through the opening 14 and thus damage the internal components.

[0037] Specifically, such as Figure 5 As shown, the pleated portion 31 includes a contraction portion 312 and a connecting port 313. The connecting port 313 is located on the side near the opening 14 and corresponds to the front and back of the opening 14, serving as the initial entry point for impurities that may enter the sealing element 3 area. The contraction portion 312 starts from the connecting port 313, extends towards the drive shaft 41, and gradually narrows, presenting a trumpet shape or a cone shape, finally converging at the connecting hole 311. The contraction portion 312 extends from the connecting port 313 to the connecting hole 311 in a trumpet shape. As the constriction occurs, impurities, especially relatively small hair fragments, entering the gradually narrowing channel of the constriction section 312 are difficult to remain stably or continue to penetrate deeper in the gradually narrowing and dynamically disturbed channel due to the combined effects of centrifugal force generated by the movement of the drive shaft 41, airflow disturbance, and equipment vibration. The wider connection port 313 provides a smooth exit path for the ejected impurities, making it easier for them to be guided back to the area near the cutter head 2 or directly discharged to the outside of the equipment through the opening 14, rather than accumulating inside the seal 3 or being forcibly squeezed into the connection hole 311.

[0038] Furthermore, such as Figure 5As shown, the shrinkage section 312 is provided with an annular boss 314, and the connection hole 311 is provided on the annular boss 314. By designing the annular boss 314, the connection between the drive shaft 41 and the connection hole 311 is in a relatively "isolated" and "protruding" position, reducing the chance of liquid directly contacting and surrounding the inlet of the connection hole 311. This makes it difficult for impurities such as water to enter the interior. This design makes the hair trimmer more adaptable to humid environments or scenarios that require water washing and cleaning, reducing the risk of short circuit of the motor 4, bearing corrosion, and damage to internal components due to moisture caused by liquid intrusion, and improving the environmental durability and safety of the product.

[0039] Specifically, such as Figure 6-8 As shown, the sealing element 3 includes a connecting portion 32, which includes a flat pressing edge 322 and an arc-shaped pressing edge 321 designed opposite to each other. The lower shell 12 is provided with a sealing platform 121 and a mounting base 122. A gap 123 is provided between the sealing platform 121 and the mounting base 122. The flat pressing edge 322 is pressed into and engaged in the gap 123 and is press-fitted into the lower shell 12. The upper shell 11 is provided with a mounting slot 111 adapted to the arc-shaped pressing edge 321. The arc-shaped pressing edge 321 is inserted into the mounting slot 111 and is interference-fitted with the upper shell 11. This design simplifies the structure and can fix the sealing element 3 to the lower shell 12 and the upper shell 11 without the need for additional fasteners, thus reducing costs. At the same time, only the pressing action is required, eliminating the operation steps and time of grasping, aligning, and tightening the fasteners. It is easy to automate production, and the structure is compact and not easy to loosen, avoiding maintenance and after-sales problems caused by loose fasteners, failure or improper installation.

[0040] Furthermore, such as Figure 9-11 As shown, the sealing element 3 also includes a connecting cavity 34, which corresponds to the protrusion 33 formed on the other side of the sealing element 3. During installation, the sealing element 3 is first fitted onto the motor 4, with the drive shaft 41 of the motor 4 passing through the connecting hole 311 of the sealing element 3. Then, the flat pressing edge 322 of the sealing element 3 is aligned with the gap 123 and precisely pressed in, so that the sealing element 3 is engaged with the lower shell 12. Subsequently, the motor 4 is fixedly connected to the lower shell 12, with part of the motor 4 inserted into the connecting cavity 34. This design achieves miniaturization of the hair trimmer and naturally plays a guiding and alignment role, helping the motor 4 to be installed quickly and accurately, reducing the risk of misalignment.

[0041] Furthermore, such as Figure 12As shown, the upper shell 11 includes a neck 112, which includes a slope 1121. The slope 1121 is inclined toward the direction close to the blade head 2. During the cutting process, the hair fragments cut by the fixed blade 22 and the moving blade 21 will fall or splash naturally. The presence of the slope 1121 provides a smooth, inclined guiding surface for these falling fragments, which is conducive to the direct fall of the cut hair.

[0042] Preferably, such as Figure 13 As shown, the upper shell 11 is provided with a mounting hole 113, and a viewing window 7 is embedded in the mounting hole 113. The viewing window 7 is made of transparent material. Through the viewing window 7, it is possible to directly check whether hair or other impurities have entered the mounting cavity 13 without disassembling the outer shell 1, which greatly reduces the number of times users need to frequently disassemble the outer shell 1 due to concerns about internal contamination or routine inspections.

[0043] Furthermore, the mounting slot 111 is arc-shaped to match the shape of the arc-shaped pressing edge 321. At the same time, the arc-shaped mounting slot 111 facilitates the setting of a circular viewing window 7 at the corresponding position on the upper shell 11. The upper shell 11 also has an arc-shaped tapering transition near its neck 112. In other words, the multiple arc-shaped settings complement the circular setting of the viewing window 7, enhancing the overall aesthetic appearance of the product.

[0044] Preferably, such as Figure 12 and Figure 14 As shown, the upper shell 11 includes a concave portion 114, and the lower shell 12 includes a grip portion 124, which facilitates gripping the outer shell 1. It has the characteristics of the human hand and fingers gripping, and the grip portion 124 is designed with a texture to increase friction. When the upper shell 11 and the lower shell 12 are installed, the concave portion 114 and the grip portion 124 cooperate with each other in space to form a complete gripping area that conforms to the gripping shape of the human hand. This design improves the user's subjective comfort and enhances the overall quality of the product.

[0045] Specifically, such as Figure 4 As shown, the mounting cavity 13 is equipped with an electronic control board 5 or a battery. By setting the electronic control board 5 or the battery, the motor 4 can be directly powered without the need for an external power source, which improves the adaptability of the hair trimmer and makes it easy to carry.

[0046] Specifically, such as Figure 4 , Figure 15 and Figure 16As shown, a charging assembly 6 is also provided in the mounting cavity 13. The charging assembly 6 includes a first charging part 61 and a second charging part 62. A second charging port 125 is provided at the bottom of the lower shell 12 corresponding to the second charging part 62. A notch 115 is provided at the end of the upper shell 11 away from the blade 2. A second notch 120 is provided at the end of the lower shell 12 away from the blade 2. After the upper shell 11 and the lower shell 12 are assembled with screws 15, the first notch 115 and the second notch 120 form a charging port 116 corresponding to the first charging part 61. The first charging part 61 and the second charging part 62 are compatible with different charging adapter plugs, providing two independent physical paths. Users can freely choose to charge through the first charging port 116 or the second charging port 125 according to the usage scenario, charging cable convenience, or personal preference. When the device is placed vertically, such as on a table with the tail facing up or wall-mounted, charging from the tail may be more convenient for plugging and unplugging. When the device is placed flat... When the device is on a charging dock or table, the bottom charging port is easier to connect, and the cable is less likely to be pressed by the device itself. Users can choose to use the most convenient charging cable or one that matches the specific charging environment. At the same time, if one charging port is temporarily unusable due to dirt, damage, or poor contact, the user can use another charging port, improving the usability of the device and the user experience. Preferably, the first charging unit 61 can be set to a charging port that is compatible with everyday mobile phone charging adapters, such as Type-C or Android. The second charging unit 62 can be set to a dedicated charger that is compatible with a more stable charging cable and is different from the charging port of the first charging unit 61. The dedicated charger can allow the product to be used while charging, even when the built-in battery is very low. At the same time, due to the randomness of storage and placement, the dedicated charger may be lost or not found. In this case, the charging port of the first charging unit 61 can be used to replace the dedicated charger with an everyday mobile phone charging adapter.

[0047] Furthermore, such as Figure 4 and Figure 8 As shown, the lower shell 12 is divided into a charging compartment 126, a motor compartment 127, a battery compartment 128, and an external exposed compartment 129. The sealing element 3 is installed in the external exposed compartment 129, the charging component 6 is installed in the charging compartment 126, the motor 4 is installed in the motor compartment 127, and the electronic control board 5 and the built-in rechargeable battery (not shown) are installed in the battery compartment 128. The pre-divided compartments provide a natural framework for the precise positioning and orderly installation of each component, simplifying the assembly process.

[0048] Furthermore, such as Figure 17As shown, an inner shell 16 is also installed inside the battery compartment 128. The inner shell 16 is adapted to the shape of the battery compartment 128. By designing the inner shell 16 to be installed inside the battery compartment 128 first, and then the electronic control board 5 and the built-in rechargeable battery are installed on the inner shell 16, the direct contact between the electronic control board 5 and the built-in rechargeable battery and the lower shell 12 and the wall of the battery compartment 128 is isolated. This effectively buffers the impact and vibration from the outside and prevents the components on the electronic control board 5 from being damaged or falling off due to bumps, squeezing or vibration fatigue. At the same time, in order to increase the texture of the product, the lower shell 12 can be made of metal, while the inner shell 16 can be made of insulating rubber material to meet the insulation protection to prevent leakage.

[0049] The following is a detailed explanation of the working principle of this utility model; By setting a seal 3 between the opening 14 and the motor 4, the seal 3 is first fitted onto the motor 4, with the drive shaft 41 of the motor 4 passing through the connecting hole 311 of the seal 3. Then, the flat pressing edge 322 of the seal 3 is press-fitted into the lower shell 12 to achieve initial fixation. At the same time, the seal 3 includes a flared, contracting pleated part 31, making it difficult for hair or other debris to enter the mounting cavity 13. Then, the motor 4 is installed in the motor compartment 127, with part of the motor 4 inserted into the seal 3, and the drive shaft 41 passing through... The circuit is exposed through the connection hole 311 to the exposed outer compartment 129. Then, the control board 5 and the charging component 6 are installed on the battery compartment 128 and the charging compartment 126 respectively. The moving blade 21 of the cutter head 2 is connected to the transmission shaft 41. Finally, the upper shell 11 is fixed to the lower shell 12 with screws 15 to complete the overall assembly. The sealing is achieved by the design of the sealing element 3 to prevent hair and other impurities from entering the installation cavity 13. At the same time, a viewing window 7 is provided to observe the movement status of the motor 4 and whether any impurities have entered the interior.

[0050] The innovation of this utility model lies in the fact that by setting a sealing element, hair and other impurities are prevented from entering the motor, thus extending the motor's service life. Frequent disassembly of the outer casing for internal cleaning is eliminated, improving work efficiency. The sealing element features a flat pressing edge that presses into the gap and is interference-fitted to the lower casing, while an arc-shaped pressing edge is interference-fitted to the upper casing within the mounting slot. This eliminates the need for additional fasteners to fix the sealing element to the lower and upper casings, reducing costs and avoiding maintenance and after-sales issues caused by loose, faulty, or improperly installed fasteners.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

[0052] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A seal structure for a hair restorer, characterized by comprising: The device includes a housing (1) and a cutting head (2). The housing (1) includes a detachably connected upper shell (11) and a lower shell (12). The upper shell (11) and the lower shell (12) are combined to form a mounting cavity (13). A motor (4) is provided in the mounting cavity (13). An opening (14) is provided at the front end of the housing (1) near the cutting head (2). The motor (4) includes a drive shaft (41). The cutting head (2) includes a moving blade (21) and a fixed blade (22). The fixed blade (22) is fixedly connected to the lower shell (12). A sealing element (3) is provided between the motor (4) and the opening (14). The sealing element (3) is respectively engaged with the upper shell (11) and the lower shell (12) to achieve sealing. The sealing element (3) includes a pleated part (31). The pleated part (31) is provided with a connecting hole (311) adapted to the drive shaft (41). The drive shaft (41) passes through the connecting hole (311) and is movably connected to the moving blade (21) to drive the moving blade (21) to reciprocate. The sealing element (3) prevents impurities from entering the motor (4) through the opening (14) without affecting the movement of the moving blade (21).

2. The seal structure of a hair restorer according to claim 1, wherein The pleated portion (31) includes a contraction portion (312) and a connection port (313). The connection port (313) is located on the side close to the opening (14). The contraction portion (312) extends from the connection port (313) to the connection hole (311) in a trumpet-shaped contraction.

3. The seal structure of a hair restorer according to claim 2, wherein The contraction section (312) is provided with an annular boss (314), and the connecting hole (311) is provided on the annular boss (314).

4. The seal structure for a hair restorer according to claim 1, wherein The sealing element (3) includes a connecting part (32), the connecting part (32) includes an arc-shaped pressing edge (321), the upper shell (11) is provided with an installation slot (111) adapted to the arc-shaped pressing edge (321), the arc-shaped pressing edge (321) is engaged in the installation slot (111) and is interference-connected with the upper shell (11), the installation slot (111) is arc-shaped.

5. The seal structure for a hair restorer according to claim 4, wherein The connecting part (32) further includes a flat pressing edge (322). The lower shell (12) is provided with a sealing platform (121) and a mounting base (122). A gap (123) is provided between the sealing platform (121) and the mounting base (122). The flat pressing edge (322) is pressed into the gap (123) and is interference-fitted to the lower shell (12).

6. The seal structure of a hair restorer according to claim 5, wherein The seal (3) also includes a connecting cavity (34), into which part of the motor (4) is inserted to save internal space.

7. The seal structure of a hair restorer according to claim 6, wherein The upper shell (11) includes a neck (112), and the neck (112) includes a slope (1121).

8. The seal structure of a hair restorer according to claim 7, wherein The upper shell (11) is provided with a mounting hole (113), and a viewing window (7) is embedded in the mounting hole (113). The viewing window (7) is circular.

9. The seal structure of a hair restorer according to claim 1, wherein The upper shell (11) includes a recess (114), and the lower shell (12) includes a grip (124) for easy gripping of the outer shell (1).

10. The seal structure for a hair restorer according to claim 1, wherein A charging assembly (6) is also provided in the mounting cavity (13). The charging assembly (6) includes a first charging part (61) and a second charging part (62). A second charging port (125) is provided at the bottom of the lower shell (12) corresponding to the second charging part (62). A notch (115) is provided at the end of the upper shell (11) away from the blade (2). A notch (120) is provided at the lower shell (12) away from the blade (2). After the upper shell (11) and the lower shell (12) are assembled, the notch (115) and the notch (120) form a charging port (116) corresponding to the first charging part (61). The first charging part (61) and the second charging part (62) are compatible with different charging adapter plugs.

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