Polishing head assembly of manicure polishing pen

Abstract

The technical scheme belongs to the technical field of polishing head assemblies of manicure polishing pens, and particularly relates to a polishing head assembly of a manicure polishing pen, which comprises a pen shell, the pen shell is provided with a pen cavity, the front end of the pen cavity is provided with a pen opening, the rear end of the pen cavity is provided with a mounting opening, and a polishing head fixing mechanism is mounted in the pen cavity through the mounting opening. The pen shell is provided with a fixing sleeve, the fixing sleeve is arranged on the outer side of the grinding head fixing mechanism in a sleeving mode and embedded in the pen cavity, and the fixing sleeve is fixed to the end, close to the mounting opening, of the pen cavity through a connecting structure and used for abutting against the grinding head fixing mechanism to limit the grinding head fixing mechanism to be separated. The fixing sleeve serving as an independent positioning module can keep the grinding head fixing mechanism in a fixed positioning state in the pen cavity, errors of positioning references of related parts in the grinding head fixing mechanism in the repeated disassembly and assembly process are avoided, and the safety of subsequent operation and use is improved.

Description

Technical Field

[0001] This technical solution relates to the field of nail polishing pen head assembly technology, specifically to a nail polishing pen head assembly. Background Technology

[0002] The nail buffing pen assembly is an electric nail tool that uses a high-speed rotating buffing head to shape nails. It is mainly used for shaping, removing cuticles, buffing the nail surface, and polishing. With different buffing heads of varying grits, it can meet a variety of needs. The speed can be adjusted to precisely control the force, avoiding the nail surface splitting problem caused by traditional files. It is suitable for professional nail salons and home care, and enhances the durability and shine of nail art.

[0003] For example, Chinese patent CN115227021A discloses a nail polishing machine, including a polishing pen, which includes a first housing and a second housing connected by threads. The polishing pen has a driving component inside, and a mounting hole is provided at the far end of its drive shaft. A polishing head is provided at the end of the polishing pen away from the driving component, which is movably inserted through the polishing pen and extends to the mounting hole. The sidewall of the mounting hole has several mounting grooves spaced along its circumference. A fixing block is slidably connected in each mounting groove. The polishing head has a fixing groove corresponding to the mounting groove. The polishing pen drives each fixing block to disengage from each fixing groove through a fixing component. At this time, the polishing head can be pulled out for replacement. Then, the fixing component drives each fixing block to insert into each fixing groove to fix the polishing head, thereby realizing the replacement of the polishing head.

[0004] Due to their high-precision polishing requirements, the aforementioned nail polishing machines often employ a precision integrated structure within the first housing of the polishing pen, consisting of a transmission mechanism, a reduction mechanism, bearing components, and replaceable polishing heads. When users need to disassemble and reassemble the polishing pen for cleaning, replacing polishing heads, or maintenance, reassembly can easily lead to axial offset or angular deviation, loosening of internal components, and misalignment. This can cause damage during subsequent use and results in poor operational safety, which needs improvement. Summary of the Invention

[0005] This technical solution addresses the problem that errors in the internal structure of a nail polishing pen can easily occur after users disassemble and reassemble it, leading to a high risk of damage and poor operational safety. It provides a polishing head assembly for a nail polishing pen.

[0006] The purpose of this technical solution is achieved as follows:

[0007] A nail polishing pen assembly includes a pen housing with a pen cavity. The pen housing has a pen opening at the front end and a mounting opening at the rear end. A polishing head fixing mechanism is installed inside the pen cavity through the mounting opening. The pen housing has a mounting sleeve that is fitted outside the polishing head fixing mechanism and embedded inside the pen cavity. The mounting sleeve is fixed to the end of the pen cavity near the mounting opening by a connecting structure to abut against the polishing head fixing mechanism and prevent it from detaching.

[0008] Through the above technical solution, when the nail polishing pen's polishing head assembly is in normal use, the polishing head fixing mechanism is first inserted into the pen cavity axially through the mounting port. Then, the mounting sleeve is aligned with the polishing head fixing mechanism through its inner sleeve hole and is securely locked in the inner wall of the pen cavity near the mounting port. This ensures a tight radial fit between the mounting sleeve and the polishing head fixing mechanism, with its front end face axially abutting against the rear end face of the polishing head fixing mechanism, forming a positioning constraint. To ensure that the user can maintain the polishing head fixing mechanism in a fixed position within the pen cavity during periodic disassembly and maintenance, the mounting sleeve, as an independent positioning module, avoids errors in the positioning reference of related parts within the polishing head fixing mechanism during repeated disassembly and assembly, thus improving the safety of subsequent operations.

[0009] Preferably, the connection structure includes an external thread structure and an internal thread structure adapted to the external thread structure. The mounting sleeve is provided with the external thread structure circumferentially along the outer side wall, and the internal thread structure is correspondingly located in the pen cavity and provided circumferentially along the inner side wall.

[0010] Through the above technical solution, the outer wall of the fixed sleeve is circumferentially machined with an external thread structure, and the inner wall of the corresponding installation section of the pen cavity is simultaneously designed with an internal thread structure that meshes with it circumferentially. The two are screwed together to achieve axial locking and radial alignment. During assembly, it is only necessary to align the starting end of the external thread of the fixed sleeve with the starting end of the internal thread of the pen cavity and then rotate and push it in to complete the connection. This is more convenient and avoids errors in the assembly positioning reference of related parts in the grinding head fixing mechanism during repeated disassembly and assembly, thus improving the safety of subsequent operation and use.

[0011] Preferably, the connection structure includes a locking part protruding from the inner wall of the pen cavity and a locking part disposed outside the mounting sleeve. The locking part has a locking groove, which includes a recess and a limiting groove. The limiting groove is disposed on the inner wall of the recess. After the locking part is inserted into the recess, the locking part moves along the recess to be embedded in the limiting groove to achieve limiting.

[0012] Through the above technical solution, multiple sets of L-shaped locking parts can be arranged circumferentially on the inner wall of the pen cavity. Each set of locking grooves consists of mutually perpendicular limiting grooves and inserting grooves. During assembly, the locking parts are axially fitted with the corresponding inserting grooves one by one to complete the initial positioning. Then, the mounting sleeve is rotated toward the limiting groove position so that the locking parts are completely translated and embedded into the limiting groove, and form an abutment interlock with the inner wall of the groove, thus completing the connection. This is more convenient and improves stability.

[0013] Preferably, the mounting sleeve is axially adjustable relative to the pen cavity to adjust the tightness against the grinding head fixing mechanism.

[0014] Through the above technical solution, the fixed sleeve forms an axially displaceable fit with the inner wall of the pen cavity through the threaded structure. During operation, the fixed sleeve is rotated to move along the axis of the pen cavity, thereby changing the axial clamping distance between the front end of the fixed sleeve and the contact surface of the grinding head fixing mechanism. This compensates for and maintains a stable clamping force, avoiding processing vibration caused by increased gap. It also allows for flexible adjustment of the contact pressure for different processing materials, maintaining the compactness of the equipment structure.

[0015] Preferably, the mounting sleeve includes a pressure-regulating section, a connecting section, and an operating section. The connecting section is connected between the pressure-regulating section and the operating section. The connecting structure is provided between the connecting section and the inner wall of the pen cavity. The grinding head fixing mechanism is fitted with a bearing component. The pressure-regulating section abuts against the rear of the bearing component. The operating section is provided with at least two grooves, each groove being located on the side of the operating section away from the connecting section.

[0016] The above technical solution comprises a pressure-regulating section, a connecting section, and an operating section. The connecting section is fixed to the inner wall of the pen cavity via an external thread or a snap-fit ​​part. The front end of the pressure-regulating section abuts against the rear of the bearing component of the grinding head fixing mechanism, forming an axial positioning constraint. The operating section has two symmetrical grooves at its end, facilitating tool insertion and rotation. During assembly, the tool is used to rotate the entire mounting sleeve by turning the grooves in the operating section, locking the connecting section thread or snap-fit ​​part to the pen cavity. Simultaneously, the pressure-regulating section presses the bearing component axially, ensuring the stability of the grinding head fixing mechanism without displacement. When professionals need to maintain or adjust the pressure, the operating section can be rotated in the opposite direction to release the pressure. This segmented design optimizes assembly convenience, axial pressure adjustability, and maintenance operations.

[0017] Preferably, the pen housing has a boss protruding along the inner peripheral wall inside the pen cavity, and the boss has a limiting surface on the side opposite to the through port of the mounting port, which is used to abut against the connecting section.

[0018] With the above technical solution, the inner wall of the pen cavity of the pen shell is provided with a boss, the limiting surface of which is located at the opposite end of the mounting port and abuts against the front end face of the connecting section of the fixed sleeve; during assembly, after the fixed sleeve is screwed in by the thread or the snap-fit ​​part is moved into the pen cavity, the connecting section moves axially until it is in rigid contact with the limiting surface of the boss, forming an axial hard stop and restricting the fixed sleeve from being screwed in excessively.

[0019] Preferably, the pen cavity includes a first chamber, a second chamber, and a third chamber connected in sequence. The cross-sectional dimensions of the grinding head fixing mechanism match the cross-sectional dimensions of the first chamber. The bearing component is correspondingly engaged in the second chamber. The cross-sectional dimensions of the pressure-regulating section are less than or equal to the cross-sectional dimensions of the second chamber.

[0020] Through the above technical solution, the pen cavity is composed of three chambers connected in sequence: chamber one, chamber two, and chamber three. The main body of the grinding head fixing mechanism matches and is embedded in chamber one to achieve radial positioning. The outer diameter of the bearing component engages with the inner wall of chamber two. At the same time, the cross-sectional dimensions of the pressure-regulating section are adapted to the cross-section of chamber two, allowing it to move axially into chamber two and abut against the rear end of the bearing component. During assembly, the main body of the grinding head fixing mechanism is pushed into the position of chamber one along chamber three, and the bearing component automatically engages in chamber two. Subsequently, the mounting sleeve is installed. After the pressure-regulating section enters chamber two, it abuts against the bearing component, reducing excess clearance after assembly and improving assembly stability.

[0021] The key and beneficial technical effects of this technical solution compared to existing technologies are:

[0022] 1. This technical solution uses a modular design of the mounting sleeve to form a positioning constraint under the tight fit of axial contact and radial contact. This ensures that the grinding head fixing mechanism maintains the consistency of the reference during repeated disassembly and assembly, avoids the accumulation of errors in parts due to frequent operation, simplifies the maintenance process, and improves operational safety. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this embodiment;

[0024] Figure 2 This is a schematic diagram of a partial explosion in Example 1;

[0025] Figure 3 This is a partial cross-sectional view of Example 1;

[0026] Figure 4 This is a partial structural diagram of the mounting sleeve in Example 1;

[0027] Figure 5 This is a partial cross-sectional view of the pen casing in Example 1;

[0028] Figure 6 This is a partial structural diagram of the mounting sleeve in Example 2;

[0029] Figure 7 This is a partial cross-sectional view of the pen housing in Example 2.

[0030] Reference numerals: 1. Pen housing; 2. Pen cavity; 21. Chamber 1; 22. Chamber 2; 23. Chamber 3; 3. Pen opening; 4. Mounting port; 5. Grinding head fixing mechanism; 6. Mounting sleeve; 61. Pressure section; 62. Connecting section; 63. Operating section; 7. Connecting structure; 8. External thread structure; 9. Internal thread structure; 10. Fitting part; 11. Inserting part; 12. Fitting groove; 121. Inserting groove; 122. Limiting groove; 13. Bearing part; 14. Groove; 15. Boss part; 16. Limiting surface; 17. Grinding head. Detailed Implementation

[0031] The specific implementation of this technical solution will be further described in detail below with reference to the accompanying drawings.

[0032] Example 1:

[0033] See Figure 1 and Figure 5 A nail polishing pen assembly includes a pen housing 1 with a corresponding pen cavity 2 inside. The pen cavity 2 has a pen opening 3 formed at the front end and an installation port 4 formed at the rear end of the pen housing 1. A polishing head fixing mechanism 5 is installed in the pen cavity 2 and is axially inserted into the pen cavity 2 through the installation port 4. The polishing head fixing mechanism 5 is prior art, and for details, please refer to the brushless motor and nail polishing machine disclosed in patent publication number CN219779924U, which will not be described in detail here. A polishing head 17 is inserted through the inner side of the polishing head fixing mechanism 5, and one end of the polishing head 17 extends to the pen opening 3 after being fixed. The polishing head 17 is detachably mounted on the polishing head fixing mechanism 5. The polishing head fixing mechanism 5 can be used with different polishing heads 17. The polishing head fixing mechanism 5 drives the polishing head 17 fixed with it to rotate synchronously through a drive mechanism, thereby realizing the nail polishing work.

[0034] The pen cavity 2 includes a first chamber 21, a second chamber 22, and a third chamber 23 connected in sequence. The second chamber 22 is located between the first chamber 21 and the third chamber 23. The first chamber 21 is relatively closer to the pen opening 3, and the third chamber 23 is closer to the mounting port 4. The channel cross-section of the second chamber 22 is larger than that of the first chamber 21, and the channel cross-section of the third chamber 23 is larger than that of the second chamber 22. The cross-sectional dimensions of the grinding head fixing mechanism 5 match the channel cross-section of the first chamber 21, and its front end is engaged in the first chamber 21 and used to allow the grinding head to extend out of the pen opening 3.

[0035] See Figure 2 , Figure 3 and Figure 4The pen housing 1 is also provided with a mounting sleeve 6. The overall size of the mounting sleeve 6 is less than or equal to that of the three chambers 23. The mounting sleeve 6 includes three parts: a pressure-regulating section 61, a connecting section 62, and an operating section 63. The connecting section 62 is connected between the pressure-regulating section 61 and the operating section 63. The mounting sleeve 6 is fixed to the end of the pen cavity 2 near the mounting port 4 by a connecting structure 7. The connecting structure 7 includes an external thread structure 8 and a matching internal thread structure 9 on the inner side wall of the pen cavity 2. The external thread structure 8 is set on the outer peripheral wall of the connecting section 62. The external thread of the mounting sleeve 6 and the internal thread of the pen cavity 2 are helically engaged along the axial direction to form a self-locking connection, so that the mounting sleeve 6 is threadedly connected in the three chambers 23. The thread structure can effectively resist axial tension. The inner peripheral wall of the pen cavity 2 has a boss 15 protruding from it. The side of the boss 15 opposite to the through port of the mounting port 4 has a limiting surface 16, which can abut against the connecting section 62 to limit its excessive rotational connection.

[0036] The cross-sectional dimensions of the pressure-regulating section 61 are less than or equal to the cross-sectional dimensions of the second chamber 22. The end face of the pressure-regulating section 61 facing away from the connecting section 62 can be embedded in the second chamber 22. The grinding head fixing mechanism 5 is equipped with a bearing component 13, which is engaged in the second chamber 22. The pressure-regulating section 61 can abut against the bearing component 13. The fixing sleeve 6 can be axially adjusted relative to the pen cavity 2 to adjust the tightness against the grinding head fixing mechanism 5.

[0037] The specific work process of this plan is as follows:

[0038] This technical solution involves first inserting the grinding head fixing mechanism 5 into the pen cavity 2 axially through the mounting port 4, and then aligning the mounting sleeve 6 with the grinding head fixing mechanism 5 through its inner sleeve hole. The external thread structure 8 engages with the internal thread structure 9 inside the pen cavity 2 until the pressure section 61 abuts against the rear of the bearing component 13 fitted onto the grinding head fixing mechanism 5. This creates a tight radial fit between the mounting sleeve 6 and the grinding head fixing mechanism 5, with its front end face axially abutting against the rear end face of the grinding head fixing mechanism 5, forming a positioning constraint. To ensure that the user can maintain the grinding head fixing mechanism 5 in a fixed position within the pen cavity 2 during periodic disassembly and maintenance, the mounting sleeve 6, as an independent positioning module, avoids errors in the positioning reference of related parts within the grinding head fixing mechanism 5 during repeated disassembly and assembly, thus improving the safety of subsequent operations.

[0039] Example 2:

[0040] See Figure 6 and Figure 7A nail polishing pen head assembly differs from Embodiment 1 in that the connecting structure 7 includes a locking part 10 and a locking part 11. The mounting sleeve 6 has multiple locking parts 11 protruding from its exterior. The inner wall of the pen cavity 2 is provided with multiple locking parts 10 corresponding to the positions of each locking part 11. Each locking part 10 has a locking groove 12. The locking part includes a groove 121 and a limiting groove 122. The limiting groove 122 is provided on the inner wall of the groove 121, so that one end of the groove 121 is through-hole facing the direction of the mounting port 4, and the side wall of the other end is connected to the limiting groove 122. The locking groove 12 is L-shaped in general. The cross-sectional dimensions of the locking part 11 are adapted to the channel dimensions of the locking groove 121.

[0041] The specific work process of this plan is as follows:

[0042] This technical solution involves axially fitting the locking part 11 into the corresponding groove 121 until it abuts against the inner wall of the groove 121 opposite to the through end, thus completing the initial positioning. Then, the mounting sleeve 6 is rotated toward the limiting groove 122, so that the locking part 11 is completely translated and embedded into the limiting groove 122, and forms an axial abutment interlock with the inner wall of the groove near the mounting port 4, thus completing the connection. This is more convenient and avoids errors in the assembly positioning reference of related parts in the grinding head fixing mechanism 5 during repeated disassembly and assembly, thereby improving the safety of subsequent operation and use.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this technical solution. Those skilled in the art should understand that this technical solution is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this technical solution. Various changes and modifications can be made to this technical solution without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed technical solution. The scope of protection of this technical solution is defined by the appended claims and their equivalents.

Claims

1. A nail polishing pen head assembly, comprising a pen housing (1), the pen housing (1) having a pen cavity (2), a pen opening (3) being provided at the front end of the pen cavity (2), and an installation port (4) being provided at the rear end of the pen cavity (2), wherein a polishing head fixing mechanism (5) is installed inside the pen cavity (2) through the installation port (4), and a polishing head is inserted through the inner side of the polishing head fixing mechanism (5), characterized in that: The pen housing (1) is provided with a mounting sleeve (6), which is sleeved on the outside of the grinding head fixing mechanism (5) and embedded in the pen cavity (2). The mounting sleeve (6) is fixed to one end of the pen cavity (2) near the mounting port (4) by a connecting structure (7) and is used to abut against the grinding head fixing mechanism (5) to restrict its separation.

2. The nail polishing head assembly according to claim 1, characterized in that: The connection structure (7) includes an external thread structure (8) and an internal thread structure (9) adapted to the external thread structure (8). The mounting sleeve (6) is provided with the external thread structure (8) circumferentially along the outer side wall, and the internal thread structure (9) is located in the pen cavity (2) circumferentially along the inner side wall.

3. The nail polishing head assembly according to claim 2, characterized in that: The connecting structure (7) includes a locking part (10) protruding from the inner wall of the pen cavity (2) and a locking part (11) disposed outside the mounting sleeve (6). The locking part (10) has a locking groove (12). The locking groove (12) includes a groove (121) and a limiting groove (122). The limiting groove (122) is disposed on the inner wall of the groove (121). After the locking part (11) is embedded in the groove (121), the locking part (11) moves along the groove (121) to be embedded in the limiting groove (122) to achieve limiting.

4. The nail polishing head assembly according to claim 2, characterized in that: The mounting sleeve (6) can be axially adjusted relative to the pen cavity (2) to adjust the tightness against the grinding head fixing mechanism (5).

5. The nail polishing head assembly according to claim 2 or 3, characterized in that: The mounting sleeve (6) includes a pressure section (61), a connecting section (62), and an operating section (63). The connecting section (62) is connected between the pressure section (61) and the operating section (63). The connecting structure (7) is provided between the connecting section (62) and the inner wall of the pen cavity (2). The grinding head fixing mechanism (5) is fitted with a bearing component (13). The pressure section (61) abuts against the rear of the bearing component (13). The operating section (63) is provided with at least two grooves (14). Each groove (14) is located on the side of the operating section (63) away from the connecting section (62).

6. The nail polishing head assembly according to claim 2, characterized in that: The pen housing (1) has a boss (15) protruding along the inner peripheral wall inside the pen cavity (2). The boss (15) has a limiting surface (16) on the side opposite to the through port of the mounting port (4), which is used to abut against the connecting section (62).

7. The nail polishing head assembly according to claim 5, characterized in that: The pen cavity (2) includes a first chamber (21), a second chamber (22), and a third chamber (23) connected in sequence. The cross-sectional dimensions of the grinding head fixing mechanism (5) match the cross-sectional dimensions of the first chamber (21). The bearing component (13) is correspondingly engaged in the second chamber (22). The cross-sectional dimensions of the constant pressure section (61) are less than or equal to the cross-sectional dimensions of the second chamber (22).

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