Novel blade drive head connection structure
Patent Information
- Application Number
- CN202522538575.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-28
- Publication Date
- 2026-09-29
- Estimated Expiration
- 2035-11-28
AI Technical Summary
[0002]现有技术中，动刀在于驱动件连接安装的时候，由于二者之间存在间隙会导致动刀安装的过程中发生摆动，这种摆动不仅会影响动刀的安装精度，使得动刀与静刀之间的配合间隙难以精确控制，进而影响毛发剪切设备整体的剪切效果，导致剪切不整齐、出现拉扯毛发等问题，降低用户的使用体验
[0015]本实用新型的有益效果在于：通过在驱动头上设置具有动刀限位部和动刀活动部的刀头连接端，这样的结构设置不仅在装配动刀组件的过程中确保了其初始位置的稳定性，避免因装配不当而导致的初始偏差或晃动，而且在后续的使用过程中，通过弹性件的弹性支撑以及摆动间隙的灵活配合，使得动刀组件能够根据不同厚度、硬度的毛发进行自适应的调整。无论是细软的绒毛还是粗硬的发丝，动刀组件都能在摆动间隙的范围内进行精准的摆动，与静刀组件相互配合，实现高效、顺畅的剪切动作。
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Figure CN224809580U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hair cutting equipment technology, specifically to a novel blade drive head connection structure. Background Technology
[0002] In existing technologies, when the moving blade is connected and installed to the drive component, a gap exists between the two, causing the moving blade to oscillate during installation. This oscillation not only affects the installation accuracy of the moving blade but also makes it difficult to precisely control the fit gap between the moving and stationary blades, thus affecting the overall cutting effect of the hair cutting device. This results in uneven cutting, pulling of hair, and other problems, reducing the user experience. However, even if the gap between the two is eliminated, the blade cannot oscillate during the cutting process to perform comprehensive hair cutting, which also causes a series of problems. For example, it cannot adapt to hair of different directions and thicknesses, easily causing some hair to be cut incompletely, affecting cutting efficiency and quality. Summary of the Invention
[0003] In view of this, the present invention provides a novel blade drive head connection structure.
[0004] To achieve the above objectives, this utility model provides the following technical solution:
[0005] A novel blade drive head connection structure includes a drive head and a blade assembly. The blade assembly includes a moving blade assembly and a stationary blade assembly. The stationary blade assembly forms an open inner cavity, and the moving blade assembly is disposed within the inner cavity. A drive head connection groove is formed on the moving blade assembly. The drive head has a moving blade connection end. The moving blade connection end is provided with a moving blade limiting part and a moving blade movable part from top to bottom. An elastic element is provided on the drive head to support the moving blade assembly. Under the support of the elastic element, the inner wall of the drive head connection groove of the moving blade assembly is limited and connected to the moving blade limiting part.
[0006] Preferably, when the stationary blade assembly is under force and drives the moving blade assembly to compress the elastic element, the inner wall of the drive head connecting groove disengages from the moving blade limiting part and forms a swing gap between it and the moving blade movable part, allowing the moving blade assembly to swing.
[0007] Preferably, at least two moving blade connecting ends are provided, and a movable groove is formed between two moving blade connecting ends. A steel shaft is provided at the center of the movable groove, and the elastic element is sleeved on the steel shaft. One end of the steel shaft extends into the movable groove and is movably connected to the moving blade assembly. One end of the moving blade assembly extends into the movable groove and reciprocates along the steel shaft. During the movement of the moving blade assembly, the inner wall of the drive head connecting groove is engaged with or separated from the moving blade limiting part.
[0008] Preferably, the width of the moving blade limiting part is greater than the width of the moving blade movable part. The moving blade limiting part has two inclined guide surfaces and a limiting surface disposed between the two inclined guide surfaces. One of the two inclined guide surfaces is in contact with the moving blade movable part. In its natural state, the elastic member has the limiting surface in contact with the inner wall of the drive head connecting groove to limit the swing of the moving blade assembly.
[0009] Preferably, a limiting pad is provided in the movable groove, the limiting pad is located at one end of the elastic element near the blade assembly, the steel shaft passes through the limiting pad, the limiting pad is limited to the two moving blade connection ends and reciprocates along the moving blade connection ends and the steel shaft.
[0010] Preferably, a limiting structure is provided between the limiting pad and the moving blade connection end. The limiting structure includes a height limiting unit provided on the moving blade connection end and a horizontal limiting unit provided on the limiting pad. The height limiting unit limits the height position of the limiting pad in the movable groove, and the horizontal limiting unit limits the horizontal position of the limiting pad in the movable groove.
[0011] Preferably, the height limiting unit is a block-shaped structure protruding from the opposite end faces of the two moving blade connection ends, and the height limiting unit abuts against the top two sides of the limiting pad to limit the height of the limiting pad in the movable groove.
[0012] Preferably, the horizontal limiting unit includes two horizontal limiting ends protruding on both sides of the limiting pad near the corresponding moving blade connection end, a horizontal limiting groove is formed between the two horizontal limiting ends on each side, and one side of the corresponding moving blade connection end extends into the horizontal limiting groove and is limited to the limiting pad.
[0013] Preferably, the horizontal limiting unit further includes a steel shaft through hole opened in the center of the limiting pad, the steel shaft passing through the steel shaft through hole and the inner wall of the steel shaft through hole fitting with the steel shaft to limit the horizontal position of the limiting pad.
[0014] Preferably, a steel shaft sleeve is provided at the center of the bottom of the limiting pad, and a through groove is opened at the center of the steel shaft sleeve to connect with the through hole of the steel shaft. The steel shaft passes through the steel shaft sleeve, and there is a gap or zero fit between the groove wall at the center of the steel shaft sleeve and the steel shaft.
[0015] The beneficial effects of this invention are as follows: By setting a blade head connection end with a moving blade limiting part and a moving blade movable part on the drive head, this structural design not only ensures the stability of the initial position of the moving blade assembly during assembly, avoiding initial deviations or shaking caused by improper assembly, but also allows the moving blade assembly to adaptively adjust to hair of different thicknesses and hardnesses during subsequent use, thanks to the elastic support of the elastic element and the flexible coordination of the swing gap. Whether it is fine and soft down or coarse and hard hair, the moving blade assembly can swing precisely within the swing gap range, cooperating with the stationary blade assembly to achieve efficient and smooth cutting action. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Appendix Figure 1 This is a schematic diagram of the structure of this utility model;
[0018] Appendix Figure 2 This is an exploded view of the drive head structure;
[0019] Appendix Figure 3 This is a schematic diagram of the drive head and drive sub-assembly.
[0020] Appendix Figure 4 For the appendix Figure 3 Enlarged view of point A in the middle. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0022] The present invention will now be further described with reference to the accompanying drawings.
[0023] This utility model provides the following technical solution:
[0024] As attached Figure 1-4As shown, this utility model discloses a novel blade drive head connection structure, including a drive head 1 and a blade assembly 2. The blade assembly 2 includes a moving blade assembly 3 and a stationary blade assembly (not shown). The stationary blade assembly forms an open inner cavity, and the moving blade assembly 3 is disposed within the inner cavity. A drive head connection groove 6 is formed on the moving blade assembly 3. The drive head 1 has a moving blade connection end 7. The moving blade connection end 7 is provided with a moving blade limiting part 8 and a moving blade movable part 9 from top to bottom. An elastic element 10 is provided on the drive head 1 to support the moving blade assembly 3. Under the support of the elastic element 10, the inner wall of the drive head connection groove 6 of the moving blade assembly 3 is limited and connected to the moving blade limiting part 8. When the stationary blade assembly is driven by force to compress the elastic element 10, the inner wall of the drive head connection groove 6 disengages from the moving blade limiting part 8 and forms a swing gap between it and the moving blade movable part 9, allowing the moving blade assembly 3 to swing. Specifically, in this design, by providing a blade connecting end 7 with a moving blade limiting part 8 and a moving blade movable part 9 on the drive head, the moving blade assembly 3, during assembly with the drive head 1, does not apply pressure to the elastic element 10. The inner wall of the drive head connecting groove 6 on the moving blade assembly 3 will be tightly connected with the moving blade limiting part 8, thus ensuring a stable position for the moving blade assembly 3 during initial assembly. When the blade assembly 2 is installed and hair is being cut, the stationary blade assembly is subjected to force, causing the moving blade assembly 3 to move downwards, thereby compressing the elastic element 10. During this process, the inner wall of the drive head connecting groove 6 will disengage from the moving blade limiting part 8, forming a swing gap with the moving blade movable part 9. This swing gap provides the necessary space for the moving blade assembly 3 to swing flexibly according to cutting requirements, thereby achieving effective hair cutting. This structural design not only ensures the stability of the initial position of the moving blade assembly 3 during assembly, avoiding initial deviations or shaking caused by improper assembly, but also allows the moving blade assembly to adaptively adjust to hair of different thicknesses and hardnesses during subsequent use, thanks to the elastic support of the elastic element and the flexible coordination of the swing gap. Whether it's fine, soft down or coarse, stiff hair, the moving blade assembly can swing precisely within the swing gap range, working in conjunction with the stationary blade assembly to achieve efficient and smooth cutting action.
[0025] Furthermore, at least two moving blade connection ends 7 are provided, forming a movable groove 11 between the two moving blade connection ends 7. A steel shaft 12 is disposed at the center of the movable groove 11, and the elastic element 10 is sleeved on the steel shaft 12. One end of the steel shaft 12 extends into the movable groove 11 and is movably connected to the moving blade assembly 3. One end of the moving blade assembly 3 extends into the movable groove 11 and reciprocates along the steel shaft 12. During the movement of the moving blade assembly 3, the inner wall of the drive head connection groove 6 is engaged with or separated from the moving blade limiting part 8. Specifically, in this embodiment, two moving blade connection ends 7 are provided, and the two moving blade connection ends 7 are arranged opposite each other to form a movable groove 11. The steel shaft 12 is precisely disposed at the center of the movable groove 11, and the elastic element 10 is securely sleeved on the steel shaft 12. One end of the steel shaft 12 extends into the movable groove 11 and is movably connected to the moving blade assembly 3, so that the moving blade assembly 3 can move within a certain range around the steel shaft 12 as the axis. One end of the moving blade assembly 3 extends into the movable groove 11 and reciprocates along the steel shaft 12 under the action of the drive structure. During the movement of the moving blade assembly 3, the inner wall of the drive head connecting groove 6 will fit or separate from the moving blade limiting part 8 depending on different working conditions. When in the initial assembly state or under specific working conditions, the inner wall of the drive head connecting groove 6 fits tightly with the moving blade limiting part 8 to ensure the stability of the moving blade assembly 3; while in working conditions such as hair cutting that require flexible movement of the moving blade assembly 3, the inner wall of the drive head connecting groove 6 will separate from the moving blade limiting part 8 to provide space for the swing of the moving blade assembly 3.
[0026] Furthermore, the width of the moving blade limiting part 8 is greater than the width of the moving blade movable part 9. The moving blade limiting part 8 has two inclined guide surfaces 13 and a limiting surface 14 disposed between the two inclined guide surfaces 13. One of the two inclined guide surfaces 13 is in contact with the moving blade movable part 9. In its natural state, the elastic member 10 has the limiting surface 14 in contact with the inner wall of the drive head connecting groove 6 to limit the swing of the moving blade assembly 3. Specifically, in this embodiment, the width of the moving blade limiting part 8 is designed to be greater than the width of the moving blade movable part 9. This dimensional difference provides a basis for the stable limiting and flexible swing of the moving blade assembly 3. The moving blade limiting part 8 is provided with two inclined guide surfaces 13 and a limiting surface 14 located between the two inclined guide surfaces 13. The design of the inclined guide surfaces 13 allows the moving blade assembly 3 to transition smoothly during movement, reducing friction and jamming. One of the inclined guide surfaces 13 is in contact with the moving blade movable part 9, providing a guiding function for the swing of the moving blade assembly 3. When the elastic element 10 is in its natural state, the limiting surface 14 is in close contact with the inner wall of the drive head connecting groove 6, precisely limiting the swing of the moving blade assembly 3 and ensuring the stability of the moving blade assembly 3 in its initial position or under specific working conditions. This design not only ensures the reliable positioning of the moving blade assembly 3 when stability is required, but also provides sufficient space and guidance for its swing when flexible movement is required.
[0027] Furthermore, a limiting pad 15 is provided within the movable groove 11. The limiting pad 15 is located at the end of the elastic member 10 near the blade assembly. The steel shaft 12 passes through the limiting pad 15. The limiting pad 15 is in a limiting connection with the two moving blade connection ends 7 and reciprocates along the moving blade connection ends 7 and the steel shaft 12. Specifically, in this embodiment, a limiting pad 15 is provided within the movable groove 11, and the limiting pad 15 is positioned at the end of the elastic member 10 near the blade assembly 2. The steel shaft 12 is securely passed through the limiting pad 15, ensuring that the limiting pad 15 can move precisely along the steel shaft 12. The limiting pad 15 achieves a tight limiting connection with the two moving blade connection ends 7. It can not only reciprocate along the moving blade connection ends and the steel shaft 12 as the moving blade assembly moves, but also provide additional support and stability to the moving blade assembly 3 during movement. When the moving blade assembly 3 reciprocates along the steel shaft 12 under the action of the drive structure, the limiting pad 15 moves accordingly, always maintaining a suitable position between the elastic element 10 and the moving blade assembly 3. This effectively prevents the elastic element 10 from shifting or twisting during compression or extension, thus ensuring the stability and reliability of the entire blade drive head connection structure. Furthermore, the limiting pad 15 further enhances the smoothness of the moving blade assembly during movement, reduces noise and wear caused by friction or jamming, and extends the service life of the entire structure.
[0028] Furthermore, a limiting structure is provided between the limiting pad 15 and the moving blade connection end 7. This limiting structure includes a height limiting unit 16 disposed on the moving blade connection end 7 and a horizontal limiting unit disposed on the limiting pad 15. The height limiting unit 16 limits the height position of the limiting pad 15 within the movable groove 11, and the horizontal limiting unit limits the horizontal position of the limiting pad 15 within the movable groove 11. Specifically, in this embodiment, to ensure the precise movement and stable positioning of the limiting pad 15 within the movable groove 11, a limiting structure is specially provided between the limiting pad 15 and the moving blade connection end 7. This limiting structure consists of two parts: one part is the height limiting unit 16 disposed on the moving blade connection end 7, and the other part is the horizontal limiting unit disposed on the limiting pad 15. The height limiting unit 16 controls the height position of the limiting pad 15 within the movable groove 11, preventing it from dislodging during vertical movement. This ensures the limiting pad 15 remains within the correct height range, effectively supporting and stabilizing the elastic element 10 and the moving blade assembly 3. The horizontal limiting unit precisely defines the horizontal position of the limiting pad 15 within the movable groove 11. It ensures the limiting pad 15 maintains horizontal stability as it reciprocates along the steel shaft 12 and the moving blade connection end 7, preventing unnecessary offset or tilting due to external forces. This design not only enhances the stability and reliability of the entire blade drive head connection structure but also significantly reduces noise and wear caused by friction or jamming between components, further extending the structure's service life.
[0029] Furthermore, the height limiting unit 16 is a block-shaped structure protruding from the opposite end faces of the two moving blade connection ends 7. The height limiting unit 16 abuts against the top two sides of the limiting pad 15 to limit the height of the limiting pad 15 within the movable groove 11. Specifically, in this embodiment, the height limiting unit 16 is designed as a block-shaped structure protruding from the opposite end faces of the two moving blade connection ends 7. This block-shaped structure design allows it to firmly abut against the top two sides of the limiting pad 15, thereby precisely limiting the height of the limiting pad 15 within the movable groove 11. When the limiting pad 15 moves up and down within the movable groove 11, the height limiting unit 16 always ensures that the limiting pad 15 does not exceed the predetermined height range. This design not only ensures the stability of the limiting pad 15 during movement but also further enhances the stability and reliability of the entire blade drive head connection structure. At the same time, since the height limiting unit 16 is integrally formed with the moving blade connection end 7, this structure also simplifies the assembly process, improves production efficiency, and reduces manufacturing costs.
[0030] Furthermore, the horizontal limiting unit includes two horizontal limiting ends 18 protruding from both sides of the limiting pad 15 near the corresponding moving blade connection end. A horizontal limiting groove 19 is formed between the two horizontal limiting ends 18 on each side. One side of the corresponding moving blade connection end 7 extends into the horizontal limiting groove 19 and is limited to contact with the limiting pad 15. Specifically, in this embodiment, the horizontal limiting unit includes two horizontal limiting ends 18 protruding from both sides of the limiting pad 15 near the corresponding moving blade connection end. A horizontal limiting groove 19 is cleverly formed between these two horizontal limiting ends 18, and one side of the corresponding moving blade connection end 7 extends into this horizontal limiting groove 19, achieving a tight limiting contact with the limiting pad 15. This design allows the limiting pad 15 to be precisely guided by the horizontal limiting ends 18 and the horizontal limiting groove 19 when it reciprocates along the steel shaft 12 and the moving blade connection end 7, thereby maintaining horizontal stability. No matter how the moving blade assembly 3 moves, the limiting pad 15 can always remain in the correct position under the action of the horizontal limiting unit, and will not be subject to unnecessary displacement or tilting due to external forces.
[0031] Furthermore, the horizontal limiting unit also includes a steel shaft through hole 20 formed in the center of the limiting pad 15. The steel shaft 12 passes through the limiting pad 15 through the steel shaft through hole 20, and the inner wall of the steel shaft through hole 20 fits against the steel shaft 12 to limit the horizontal position of the limiting pad 15. Specifically, in this embodiment, the horizontal limiting unit also includes a steel shaft through hole 20 formed in the center of the limiting pad 15. The design of this steel shaft through hole 20 is very ingenious. It allows the steel shaft 12 to pass smoothly through the limiting pad 15, thereby achieving a tight connection between the two. The inner wall of the steel shaft through hole 20 fits tightly against the outer surface of the steel shaft 12. This fitting design not only ensures the stability of the limiting pad 15 in the horizontal direction, but also prevents it from shifting or shaking during movement. When the limiting pad 15 reciprocates along the steel shaft 12 within the movable groove 11, the friction between the inner wall of the steel shaft through hole 20 and the steel shaft 12 plays a crucial guiding and limiting role, enabling the limiting pad 15 to always maintain the correct movement trajectory.
[0032] Furthermore, a steel shaft sleeve portion 21 is provided at the bottom center of the limiting pad 15. A through groove 22, connecting the steel shaft through hole 20, is formed in the center of the steel shaft sleeve portion 21. The steel shaft 12 passes through the steel shaft sleeve portion 21, and the groove wall of the through groove 22 in the center of the steel shaft sleeve portion 21 has a clearance or zero fit with the steel shaft 12. Specifically, in this embodiment, the steel shaft sleeve portion 21 is provided at the bottom center of the limiting pad 15. This design further enhances the connection stability between the limiting pad and the steel shaft. A through groove 22 is formed in the center of the steel shaft sleeve portion 21, which connects to the upper steel shaft through hole 20, forming a complete steel shaft through channel. The steel shaft 12 can smoothly pass through this steel shaft sleeve portion 21, ensuring the stable installation of the limiting pad on the steel shaft. The groove wall of the through groove 22 in the center of the steel shaft sleeve portion 21 has a clearance or zero fit with the steel shaft 12. This design ensures smooth movement of the locating pad on the steel shaft while providing sufficient friction when necessary to prevent unnecessary displacement or slippage due to external forces. When the locating pad reciprocates along the steel shaft within the movable groove, the tight fit between the steel shaft sleeve 21 and the steel shaft ensures that the locating pad's movement trajectory remains stable, preventing any shaking or displacement.
[0033] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A novel blade drive head connection structure, comprising a drive head (1) and a blade assembly (2), wherein the blade assembly (2) comprises a moving blade assembly (3) and a stationary blade assembly, wherein an open inner cavity is formed within the stationary blade assembly, the moving blade assembly (3) is disposed within the inner cavity, and a drive head connection groove (6) is formed on the moving blade assembly (3), characterized in that: The drive head (1) has a moving blade connection end (7), and the moving blade connection end (7) is provided with a moving blade limiting part (8) and a moving blade moving part (9) from top to bottom. An elastic element (10) is provided on the drive head (1) to support the moving blade assembly (3). Under the support of the elastic element (10), the inner wall of the drive head connecting groove (6) of the moving blade assembly (3) is limited and connected to the moving blade limiting part (8).
2. The novel blade drive head connection structure according to claim 1, characterized in that: When the stationary blade assembly is subjected to force and drives the moving blade assembly (3) to compress the elastic element (10), the inner wall of the drive head connecting groove (6) disengages from the moving blade limiting part (8) and forms a swing gap between it and the moving blade moving part (9) for the moving blade assembly (3) to swing.
3. The novel blade drive head connection structure according to claim 1, characterized in that: At least two moving blade connection ends (7) are provided, and a movable groove (11) is formed between the two moving blade connection ends (7). A steel shaft (12) is provided at the center of the movable groove (11). The elastic element (10) is sleeved on the steel shaft (12). One end of the steel shaft (12) extends into the movable groove (11) and is movably connected to the moving blade assembly (3). One end of the moving blade assembly (3) extends into the movable groove (11) and moves back and forth along the steel shaft (12). During the movement of the moving blade assembly (3), the inner wall of the drive head connection groove (6) is attached to or separated from the moving blade limiting part (8).
4. The novel blade drive head connection structure according to claim 1, characterized in that: The width of the moving blade limiting part (8) is greater than the width of the moving blade movable part (9). The moving blade limiting part (8) has two inclined guide surfaces (13) and a limiting surface (14) disposed between the two inclined guide surfaces (13). One of the two inclined guide surfaces (13) is in contact with the moving blade movable part (9). In its natural state, the elastic member (10) has the limiting surface (14) in contact with the inner wall of the drive head connecting groove (6) to limit the swing of the moving blade assembly (3).
5. The novel blade drive head connection structure according to claim 3, characterized in that: A limiting pad (15) is provided in the movable groove (11). The limiting pad (15) is located at one end of the elastic element (10) near the blade assembly. The steel shaft (12) passes through the limiting pad (15). The limiting pad (15) is connected to the two moving blade connection ends (7) and moves back and forth along the moving blade connection ends (7) and the steel shaft (12).
6. The novel blade drive head connection structure according to claim 5, characterized in that: A limiting structure is provided between the limiting pad (15) and the moving blade connection end (7). The limiting structure includes a height limiting unit (16) provided on the moving blade connection end (7) and a horizontal limiting unit provided on the limiting pad (15). The height limiting unit (16) limits the height position of the limiting pad (15) in the movable groove (11), and the horizontal limiting unit limits the horizontal position of the limiting pad (15) in the movable groove (11).
7. The novel blade drive head connection structure according to claim 6, characterized in that: The height limiting unit (16) is a block-shaped structure protruding on the opposite end faces of the two moving knife connecting ends (7). The height limiting unit (16) abuts against the top two sides of the limiting pad (15) to limit the height of the limiting pad (15) in the movable groove (11).
8. The novel blade drive head connection structure according to claim 6, characterized in that: The horizontal limiting unit includes two horizontal limiting ends (18) protruding on both sides of the limiting pad (15) near the corresponding moving knife connection end (7). A horizontal limiting groove (19) is formed between the two horizontal limiting ends (18) on each side. One side of the corresponding moving knife connection end (7) extends into the horizontal limiting groove (19) and is limited to the limiting pad (15).
9. The novel blade drive head connection structure according to claim 6, characterized in that: The horizontal limiting unit also includes a steel shaft through hole (20) opened in the center of the limiting pad (15). The steel shaft (12) passes through the limiting pad (15) through the steel shaft through hole (20). The inner wall of the steel shaft through hole (20) fits against the steel shaft (12) to limit the horizontal position of the limiting pad (15).
10. The novel blade drive head connection structure according to claim 7, characterized in that: A steel shaft sleeve (21) is provided at the bottom center of the limiting pad (15). A through groove (22) is opened at the center of the steel shaft sleeve (21) to connect the through hole (20) of the steel shaft. The steel shaft (12) is provided through the steel shaft sleeve (21). There is a gap or zero fit between the groove wall of the through groove (22) at the center of the steel shaft sleeve (21) and the steel shaft (12).