A hair cutting device

Abstract

The utility model relates to hair trimming technical field, and specifically disclose a kind of hair cutting device, including cutter head subassembly and for installing cutter head subassembly shell, for driving cutter head subassembly operation to cut hair driving mechanism is arranged in shell, the driving mechanism includes installation base, hair cutting device further includes flexible pad, and the driving mechanism is connected to shell by flexible pad. By making flexible connection between driving mechanism and shell can avoid driving mechanism rigid connection between shell directly, to be able to absorb vibration energy by flexible connection when driving mechanism high-speed operation produces vibration, produce buffer, further substantially reduce the vibration of shell, avoid numb feeling when user handholds shell due to vibration, also avoid hand fatigue and uncomfortable feeling brought by long time use, simultaneously, since vibration substantially reduces, thus can effectively reduce noise. Visible, the hair cutting device in the utility model, can improve the user's experience.

Description

Technical Field

[0001] This utility model relates to the field of hair trimming technology, and in particular to a hair cutting device. Background Technology

[0002] Hair trimmers are widely used in daily life, such as for trimming or shaving hair, men shaving, women removing underarm hair, and even trimming or shaving pets. For ease of storage and portability, users prefer small hair trimmers. This has led to the development of compact hair trimmers (also known as mini hair trimmers). However, existing mini hair trimmers generate significant vibrations during operation. These vibrations are transmitted to the handle casing, causing numbness in the user's hand and reducing comfort. Prolonged use can also lead to hand fatigue and discomfort. Furthermore, the significant vibrations produce considerable noise, which also affects user comfort. Utility Model Content

[0003] The present invention aims to solve the technical problems existing in the prior art and provide a hair cutting device with low vibration and low noise, thereby improving the user's comfort.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] The present invention discloses a hair cutting device, comprising a blade assembly and a housing for mounting the blade assembly. One end of the housing is open, and the blade assembly is mounted on the open end of the housing and closes the opening of the housing. A drive mechanism for driving the blade assembly to cut hair is provided inside the housing. The drive mechanism includes a mounting base, and the hair cutting device also includes a flexible pad. The drive mechanism is connected to the housing through the flexible pad.

[0006] The hair cutting device described in this utility model addresses the issue of significant vibration generated by the drive mechanism during operation. This vibration, caused by the housing, negatively impacts the user experience. By employing a flexible connection between the drive mechanism and the housing, a rigid connection is avoided. This flexible connection absorbs vibration energy during high-speed operation, providing cushioning and significantly reducing housing vibration. This prevents numbness caused by vibration when holding the housing and avoids hand fatigue and discomfort from prolonged use. Furthermore, the reduced vibration effectively lowers noise levels. Therefore, the hair cutting device of this utility model enhances the user experience.

[0007] Furthermore, the flexible pad is located below the mounting base, and a groove is provided on the flexible pad at the connection position with the mounting base. A connecting protrusion is provided in the groove, and there is a gap between the connecting protrusion and the groove wall. A portion of the mounting base is connected to the connecting protrusion.

[0008] Furthermore, the housing has an installation area for mounting the flexible pad, and two oppositely arranged mounting positions are provided in the installation area. The flexible pad has two necks on its sidewall, which are arranged opposite to each other. When the flexible pad is placed in the installation area, the two necks on the flexible pad are at least partially embedded in the corresponding mounting positions.

[0009] Furthermore, the flexible pad includes a body for connecting to the mounting base, the neck is disposed on the side wall of the body, and the two necks are symmetrically arranged on the body; a first mounting hole is provided at each neck or at a position between the neck and the body, a connecting post corresponding to the first mounting hole is provided in the mounting area, and a first connecting hole is provided on the connecting post; when the flexible pad is disposed in the mounting area, the connecting post is inserted into the corresponding first mounting hole, and a first fastener passes through the first mounting hole and the first connecting hole to connect the flexible pad to the housing.

[0010] Furthermore, first protrusions are provided on both sides of the neck and on the sidewalls of the body, and when the flexible pad is placed in the mounting area, the first protrusions abut against the sidewalls of the mounting area.

[0011] Furthermore, a second protrusion is provided on each of the two opposite sidewalls of the body, and the protrusion direction of the second protrusion is different from that of the first protrusion; a limiting groove is provided in the installation area, and when the flexible pad is placed in the installation area, the second protrusion is located in the limiting groove on the corresponding side.

[0012] Furthermore, a support base is provided inside the outer casing, and a second connecting hole is provided on the support base. The cutter head assembly includes a bracket, and a first arc-shaped protrusion is provided on the side wall at the bottom of the bracket. A third connecting hole is provided on the side of the first arc-shaped protrusion facing the second connecting hole. A second fastener passes through the second connecting hole and the third connecting hole to connect the cutter head assembly to the outer casing. A groove is provided at the end of the second connecting hole facing the third connecting hole, and a first sealing ring is provided in the groove. The first sealing ring partially protrudes outside the groove. After the cutter head assembly is connected to the outer casing, the end of the first arc-shaped protrusion abuts against the first sealing ring.

[0013] Furthermore, the blade assembly includes a bracket, the bottom of which is provided with an insertion section that extends into the housing. When the blade assembly is assembled into the housing, there is a gap between the side wall of the insertion section and the side wall of the housing. An annular groove is provided on the side wall of the insertion section, and a second sealing ring is provided in the annular groove. A portion of the second sealing ring protrudes from the annular groove and abuts against the side wall of the housing.

[0014] Furthermore, a support base is provided inside the housing, and a battery mounting slot and a circuit board mounting slot are provided at the bottom of the support base. A battery is installed in the battery mounting slot, and a drive circuit board is installed in the circuit board mounting slot. The battery is electrically connected to the drive circuit board, and the drive mechanism is electrically connected to the drive circuit board. The battery supplies power to the drive circuit board and the drive mechanism.

[0015] Furthermore, a charging interface is provided on the drive circuit board, and a through hole is provided on the housing to expose the charging interface, with the charging interface and the through hole arranged opposite to each other. Attached Figure Description

[0016] The above and other objects, features, and advantages of this invention will become clearer through a more detailed description of the preferred embodiments shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of this invention.

[0017] Figure 1 This is a schematic diagram of the hair cutter in an embodiment of the present invention.

[0018] Figure 2 for Figure 1 A sectional view.

[0019] Figure 3 and Figure 4 This is an exploded view of the cutter head assembly from different directions after removing some of its components.

[0020] Figure 5 This is a schematic diagram of the flexible pad structure in different directions.

[0021] Figure 6 This is a schematic diagram showing the structure after removing some parts of the cutter head assembly and the housing. Detailed Implementation

[0022] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be given below with reference to the accompanying drawings.

[0023] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to and integrated with the other component, or there may be an intervening component present. The terms "mounted," "one end," "the other end," and similar expressions used in this document are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] Hair cutting devices are mainly used for cutting hair, such as human hair (hair, armpit hair, beard, etc.) or animal hair. Since users need to hold the hair cutting device when trimming or removing hair, and it takes a certain amount of time to operate, in order to avoid the large vibration generated by the hair cutting device during operation causing numbness, fatigue and noise to the user, thus affecting the user experience, the technical solution in this utility model is proposed to improve the user experience.

[0026] This utility model specifically provides an embodiment of a hair cutting device, see [link to embodiment]. Figure 1-4 The device includes a blade assembly 1 and a housing 2 for mounting the blade assembly 1. One end of the housing 2 is open, and the blade assembly 1 is mounted on the open end of the housing 2, sealing the opening of the housing 2 to completely enclose the drive mechanism 3, battery 4, and drive circuit board 5 inside the housing 2. Inside the housing 2, a drive mechanism 3 is provided for driving the blade assembly 1 to cut hair. The drive mechanism 3 includes a mounting base 31, and the hair cutting device also includes a flexible pad 6. The drive mechanism 3 is connected to the housing 2 through the flexible pad 6. In this embodiment, the drive mechanism 3 can be a linear motor or linear actuator as described in existing technology, or a linear driver as described in Chinese Patent CN119834566A. In this embodiment of the hair cutting device, the drive mechanism 3 generates significant vibration during operation, causing the outer casing 2 to vibrate and affecting the user experience. Therefore, by making the drive mechanism 3 and the outer casing 2 flexibly connected, a rigid connection between the drive mechanism 3 and the outer casing 2 is avoided. This flexible connection absorbs vibration energy and buffers the vibration generated by the drive mechanism 3 during high-speed operation, significantly reducing the vibration of the outer casing 2. This prevents numbness caused by vibration when the user holds the outer casing 2, and also avoids hand fatigue and discomfort from prolonged use. Simultaneously, the significantly reduced vibration effectively reduces noise. Therefore, the hair cutting device of this invention improves the user experience. The flexible pad 6 in this embodiment can be made of rubber, silicone, etc.

[0027] See Figure 2-5 In a preferred embodiment, the flexible pad 6 is located below the mounting base 31. A groove is provided on the flexible pad 6 at the connection point with the mounting base 31. In this embodiment, there are four connection points between the flexible pad 6 and the mounting base 31, arranged in a matrix, thus there are also four grooves. A connecting protrusion 61 is provided within the groove, with a gap between the connecting protrusion 61 and the groove wall. Part of the mounting base 31 is connected to the connecting protrusion 61; specifically, the position of the mounting base 31 opposite to the connecting protrusion 61 is connected to the connecting protrusion 61. The end of the connecting protrusion 61 protrudes beyond the groove towards the mounting base 31, meaning that the mounting base 31 is lifted by the four connecting protrusions 61. There is a gap between the portion of the mounting base 31 not connected to the connecting protrusion 61 and the flexible pad 6. One end of the connecting protrusion 61 facing away from the mounting base 31 passes through the flexible pad 6. Four grooves are provided on the side of the flexible pad 6 facing away from the mounting base 31. The four grooves correspond one-to-one with the four recesses and are coaxial. The end of the connecting protrusion 61 facing away from the mounting base 31 is located in the corresponding groove and has a gap with the side wall of the groove. A fourth connecting hole 62 is provided on the connecting protrusion 61 along its axial direction. A fifth connecting hole 32 is provided on the mounting base 31. Fasteners pass through the fourth connecting hole 62 and the fifth connecting hole 32 to connect the drive mechanism 3 to the flexible pad 6. Because the mounting base 31 and the flexible pad 6 are arranged vertically and horizontally, and have multiple connection points, the drive mechanism 3 is more securely installed. The connecting protrusion 61 creates a gap between the bottom surface of the mounting base 31 and the flexible pad 6, which prevents the contact area between the mounting base 31 and the flexible pad 6 from being too large and thus hindering the operation of the drive mechanism 3. By creating a gap between the connecting protrusion 61 and the groove, the movement of the drive mechanism 3 can be further prevented from being hindered, and the vibration energy transmitted to the outer shell 2 can be further attenuated by the gap between the connecting protrusion 61 and the groove.

[0028] In the preferred embodiment, see Figure 3-4 The housing 2 has an installation area inside for mounting the flexible pad 6. Specifically, a support 7 is provided inside the housing 2, and the installation area is located on the support 7, that is, the flexible pad 6 is mounted on the support 7. There are two oppositely arranged mounting positions in the installation area. The side wall of the flexible pad 6 is provided with two necks 63, which are arranged opposite to each other. When the flexible pad 6 is placed in the installation area, the two necks 63 on the flexible pad 6 are at least partially embedded in the corresponding mounting positions. That is, the necks 63 can be completely located in the mounting positions or partially located in the mounting positions, depending on the situation. The cooperation between the necks 63 and the mounting positions enables the flexible pad 6 to be installed quickly and avoids the flexible pad 6 from shifting during the high-speed operation of the drive mechanism 3.

[0029] In the preferred embodiment, see Figure 3-5 The flexible pad 6 includes a body for connecting to the mounting base 31. Necks 63 are located on the side wall of the body, and two necks 63 are symmetrically arranged on the body. A first mounting hole 64 is provided at each neck 63 or between each neck 63 and the body; that is, the first mounting hole 64 can be located entirely at the neck 63 or at the transition point between the neck 63 and the body, depending on the situation. A connecting post 71 corresponding to the first mounting hole 64 is provided in the mounting area. A first connecting hole 72 is provided on the connecting post 71. When the flexible pad 6 is placed in the mounting area, the connecting post 71 is inserted into the corresponding first mounting hole 64, and a first fastener passes through the first mounting hole 64 and the first connecting hole 72 to connect the flexible pad 6 to the housing 2. Through this structure, the connection area is minimized while ensuring that the flexible pad 6 can be stably installed in the mounting area, further avoiding obstruction of the movement of the drive mechanism 3.

[0030] In the preferred embodiment, see Figure 3-5 First protrusions 65 are provided on both sides of the neck 63 and on the sidewalls of the body. When the flexible pad 6 is placed in the mounting area, the first protrusions 65 abut against the sidewalls of the mounting area. In this embodiment, the first protrusions 65 are provided on both sides of each neck 63 to further ensure that the flexible pad 6 is stably connected to the mounting area, while also avoiding increasing the contact area between the flexible pad 6 and the mounting area. This avoids reducing the transmission of vibration energy without hindering the operation of the drive mechanism 3.

[0031] In the preferred embodiment, see Figure 3-5 On two opposite sidewalls of the body of the flexible pad 6, a second protrusion 66 is provided, the protrusion direction of the second protrusion 66 being different from that of the first protrusion 65. A limiting groove is provided in the installation area, and when the flexible pad 6 is placed in the installation area, the second protrusion 66 is located in the limiting groove on the corresponding side. In this embodiment, two second protrusions 66 are provided at intervals on the same sidewall of the body of the flexible pad 6, and both second protrusions 66 on the same side are located in the limiting groove on the corresponding side, with the ends of the second protrusions 66 abutting against the groove wall of the limiting groove. Through the cooperation of the second protrusions 66 and the first protrusion 65, the flexible pad 6 is positioned in the X-axis and Y-axis directions, so that the flexible pad 6 is more stably connected in the installation area. Through the connection relationship between the flexible pad 6 and the installation area, not only is the connection stability of the flexible pad 6 ensured, but the contact area between the flexible pad 6 and the installation area is also avoided. This avoids reducing the transmission of vibration energy and does not hinder the operation of the drive mechanism 3. In addition, by providing the limiting groove, the range of motion of the flexible pad 6 with the drive mechanism 3 can be limited.

[0032] In the preferred embodiment, see Figure 2-4The outer casing 2 has a support base 7 inside, and a second connecting hole 73 is provided on the support base 7. Specifically, a second arc-shaped protrusion 74 protruding from the side wall of the support base 7 is provided, and the second connecting hole 73 is located on the second arc-shaped protrusion 74. The cutter head assembly 1 includes a bracket 101, and a first arc-shaped protrusion 102 is provided on the side wall of the bottom of the bracket 101. A third connecting hole 103 is provided on the side of the first arc-shaped protrusion 102 facing the second connecting hole 73. Specifically, the number of first arc-shaped protrusions 102 is the same as the number of second arc-shaped protrusions 74, and the two correspond one-to-one. The second fastener passes through the second connecting hole 73 and the third connecting hole 103 to connect the cutter head assembly 1 to the outer casing 2. A groove is provided at the end of the second connecting hole 73 facing the third connecting hole 103. A first sealing ring 8 is provided in the groove. The first sealing ring 8 partially protrudes out of the groove. After the cutter head assembly 1 is connected to the outer casing 2, the end of the first arc-shaped protrusion 102 abuts against the first sealing ring 8. After the cutter head assembly 1 is connected to the housing 2, the end of the first arc-shaped protrusion 102 abuts against the first sealing ring 8, so the energy of the high-frequency vibration of the cutter head assembly 1 with the drive mechanism 3 is attenuated by the first sealing ring 8, thereby greatly reducing the vibration energy transmitted from the cutter head assembly 1 to the housing 2 and further reducing noise.

[0033] In the preferred embodiment, see Figure 2 The cutter head assembly 1 includes a bracket 101. The bottom of the bracket 101 has an insertion section 104 that extends into the housing 2. When the cutter head assembly 1 is assembled into the housing 2, there is a gap between the sidewall of the insertion section 104 and the sidewall of the housing 2. An annular groove 105 is provided on the sidewall of the insertion section 104, and a second sealing ring 9 is provided within the annular groove 105. A portion of the second sealing ring 9 protrudes from the annular groove 105 and abuts against the sidewall of the housing 2. By creating a gap between the sidewall of the insertion section 104 and the sidewall of the housing 2, and by providing the annular groove 105 on the sidewall of the insertion section 104, and by providing the second sealing ring 9 within the annular groove 105, the structure, in conjunction with the aforementioned structure of the first sealing ring 8, effectively and significantly reduces the vibration energy transmitted from the cutter head assembly 1 to the housing 2, thereby reducing noise. (See also...) Figure 2 The cross-sectional shape of the second sealing ring 9 is inverted V-shaped. The intersection of the two sides of the V-shape abuts against the lower side wall of the annular groove 105, the end of one side of the V-shape abuts against the upper side wall of the annular groove 105, and the end of the other side abuts against the inner wall surface of the outer shell 2. Through the V-shaped sealing ring structure and the connection relationship between the sealing ring and the outer shell 2 and the bracket 101, the blade assembly 1 can float, which is beneficial for the blade assembly 1 to remove hair more cleanly.

[0034] In the preferred embodiment, see Figure 1 and 2The cutter head assembly 1 has a through hole on its support 101. A pressure plate mounting groove is provided on the upper surface of the support 101 around the through hole. An annular flange mounting groove is provided in the pressure plate mounting groove. This annular flange mounting groove is not a regular ring, but rather includes an irregularly shaped groove with connected ends. The cutter head assembly 1 also includes an elastic connector 10. The elastic connector 10 has a recessed center, and its edges are partially recessed to form a flange 11. A transition protrusion 12 is formed between the flange 11 and the recessed area of ​​the elastic connector 10. A boss 13 is provided in the recessed area of ​​the elastic connector 10. The position of the boss 13 corresponds to the output shaft 33 of the drive mechanism 3, allowing the output shaft 33 of the drive mechanism 3 to... The boss 13 extends through the shaft, and the part of the output shaft 33 that extends through it is connected to the moving blade of the cutter head assembly 1, driving the moving blade to reciprocate and cooperate with the fixed blade to cut hair. When the elastic connector 10 is installed on the bracket 101, the elastic connector 10 blocks the through hole on the bracket 101, and the flange 11 of the elastic connector 10 is embedded in the annular flange mounting groove. The transition protrusion 12 of the elastic connector 10 allows the flange 11 to pass over the groove wall of the annular flange mounting groove located on the side of the through hole and be smoothly embedded in the annular flange mounting groove. The cutter head assembly 1 also includes a pressure plate 14, which is set in the pressure plate mounting groove and limits the flange 11 of the elastic connector 10 to connect the elastic connector 10 to the bracket 101. With the above structure, when the output shaft 33 of the drive mechanism 3 drives the moving blade to move at high speed, the elastic connector 10 can further limit the movement range of the moving blade, preventing the moving blade from moving too much and damaging the user's skin. At the same time, it can also ensure that the moving blade can cooperate with the fixed blade to make precise hair cutting movements and avoid ineffective movements. In addition, it can also prevent mechanical wear caused by the output shaft 33 driving the moving blade to move too much, extend its service life, control the vibration amplitude of the moving blade, and further reduce vibration and noise, thereby improving the user experience.

[0035] In the preferred embodiment, see Figure 6The housing 2 contains a support base 7. At the bottom of the support base 7 are a battery 4 mounting slot and a circuit board mounting slot. A battery 4 is installed in the battery 4 mounting slot, and a drive circuit board 5 is installed in the circuit board mounting slot. The battery 4 and drive circuit board 5 are electrically connected, and the drive mechanism 3 is also electrically connected to drive circuit board 5. The battery 4 supplies power to drive circuit board 5 and drive mechanism 3. A charging interface 15 is provided on drive circuit board 5, and a through hole is provided on housing 2 to expose the charging interface 15. The charging interface 15 and the through hole are arranged opposite each other. The user can charge the battery 4 through the charging interface 15. When using the linear actuator disclosed in Chinese Patent CN119834566A, only the coil 34 of the linear actuator needs to be electrically connected to drive circuit board 5. Controlled by drive circuit board 5, the magnetic pole change of the electromagnet can be achieved. Thus, the reciprocating motion of the linear actuator can drive the moving blade to reciprocate. However, the specific details of controlling the magnetic pole change of the electromagnet are prior art and not the focus of this utility model.

[0036] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this specification, the references to terms such as "preferred embodiment," "another embodiment," "other embodiment," or "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A hair cutting device comprising a cutting head assembly and a housing for mounting the cutting head assembly, the housing being open at one end, the cutting head assembly being mounted at the open end of the housing and closing the opening of the housing, a drive mechanism being provided within the housing for driving the cutting head assembly into operation to cut hair, characterised in that: The drive mechanism includes a mounting base, and the hair cutting device also includes a flexible pad. The drive mechanism is connected to the housing via the flexible pad.

2. The hair cutting device according to claim 1, characterized in that: The flexible pad is located below the mounting base. A groove is provided on the flexible pad at the connection position with the mounting base. A connecting protrusion is provided in the groove. There is a gap between the connecting protrusion and the groove wall. A portion of the mounting base is connected to the connecting protrusion.

3. The hair cutting device according to claim 1 or 2, characterized in that: The housing has an installation area for mounting the flexible pad, and two oppositely arranged mounting positions are provided in the installation area. The flexible pad has two necks on its sidewall, which are arranged opposite to each other. When the flexible pad is placed in the installation area, the two necks on the flexible pad are at least partially embedded in the corresponding mounting positions.

4. The hair cutting device according to claim 3, characterized in that: The flexible pad includes a body for connecting to the mounting base, and a neck is disposed on the side wall of the body, with two necks arranged symmetrically on the body. A first mounting hole is provided at the position of each neck or between each neck and the body. A connecting post corresponding to the first mounting hole is provided in the mounting area, and a first connecting hole is provided on the connecting post. When the flexible pad is disposed in the mounting area, the connecting post is inserted into the corresponding first mounting hole, and a first fastener passes through the first mounting hole and the first connecting hole to connect the flexible pad to the housing.

5. The hair cutting device according to claim 4, characterized in that: First protrusions are provided on both sides of the neck and on the sidewalls of the body. When the flexible pad is placed in the mounting area, the first protrusions abut against the sidewalls of the mounting area.

6. The hair cutting device according to claim 5, characterized in that: A second protrusion is provided on each of the two opposite sidewalls of the body, and the protrusion direction of the second protrusion is different from that of the first protrusion; a limiting groove is provided in the installation area, and when the flexible pad is placed in the installation area, the second protrusion is located in the limiting groove on the corresponding side.

7. The hair cutting device according to claim 1 or 2, characterized in that: The housing contains a support base with a second connection hole. The cutter head assembly includes a bracket with a first arc-shaped protrusion on the side wall at the bottom of the bracket. A third connection hole is provided on the side of the first arc-shaped protrusion facing the second connection hole. A second fastener passes through the second and third connection holes to connect the cutter head assembly to the housing. A groove is provided at the end of the second connection hole facing the third connection hole, and a first sealing ring is provided in the groove. The first sealing ring protrudes out of the groove. After the cutter head assembly is connected to the housing, the end of the first arc-shaped protrusion abuts against the first sealing ring.

8. The hair cutting device according to claim 1 or 2, characterized in that: The blade assembly includes a bracket, and the bottom of the bracket is provided with an insertion section that extends into the housing. When the blade assembly is assembled into the housing, there is a gap between the side wall of the insertion section and the side wall of the housing. An annular groove is provided on the side wall of the insertion section, and a second sealing ring is provided in the annular groove. A portion of the second sealing ring protrudes from the annular groove and abuts against the side wall of the housing.

9. The hair cutting device according to claim 1 or 2, characterized in that: The housing is provided with a support base inside, and a battery mounting slot and a circuit board mounting slot are provided at the bottom of the support base. A battery is installed in the battery mounting slot, and a drive circuit board is installed in the circuit board mounting slot. The battery is electrically connected to the drive circuit board, and the drive mechanism is electrically connected to the drive circuit board. The battery supplies power to the drive circuit board and the drive mechanism.

10. The hair cutting device according to claim 9, characterized in that: A charging interface is provided on the drive circuit board, and a through hole is provided on the housing to expose the charging interface. The charging interface is arranged opposite to the through hole.

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