A blade structure
By setting a hollow part on the blade and a locking part on the rotating shaft to engage with it, the problem of unstable connection between the rotating blade and the rotating shaft is solved, and a blade structure with high stability and safety is achieved, which is suitable for high-speed cutting equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO AOKAI GARDEN TOOLS CO LTD
- Filing Date
- 2025-07-11
- Publication Date
- 2026-07-03
Smart Images
Figure CN224446101U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of cutting tool technology, specifically relating to a blade structure. Background Technology
[0002] In cutting tool applications, the rotary blade is a very common and critical working component. It is typically driven by a rotating shaft to rotate at high speed, enabling operations such as cutting, thinning, or trimming materials. However, in existing technologies, the connection structure between the rotary blade and the driving shaft still has certain defects, particularly regarding the stability of the connection points. Vibration, impact loads from high-speed rotation, and long-term use can easily cause relative rotation between the blade and the shaft. This not only affects the normal operation of the equipment but may also lead to a decrease in cutting accuracy, making it difficult to meet expected processing quality requirements. More seriously, when unexpected relative rotation occurs between the blade and the drive shaft, it may cause the blade to fall off or shift, leading to equipment damage or even safety accidents. This risk increases significantly, especially in high-speed, high-cutting-force operating environments, posing a serious threat to the personal safety of operators. Utility Model Content
[0003] To address the aforementioned shortcomings of existing technologies, the technical problem to be solved by this utility model is to propose a blade structure that provides a hollowed-out portion on the blade and a snap-fit portion on the rotating shaft that matches the inner contour of the hollowed-out portion. This snap-fit portion engages with the hollowed-out portion, effectively preventing relative rotation between the blade and the rotating shaft and improving the stability and safety of the connection.
[0004] The technical solution adopted by this utility model to solve its technical problem is to propose a blade structure, including a support frame, a blade rotatably mounted on the support frame, and a rotating shaft passing through the support frame. One end of the rotating shaft is connected to the blade, and the other end is connected to a drive wheel. The blade has a hollowed-out portion, and the rotating shaft has a locking portion that matches the contour of the inner sidewall of the hollowed-out portion. The drive wheel is connected to a driving device and drives the blade to rotate via the rotating shaft. The locking portion engages with the hollowed-out portion to prevent relative rotation between the blade and the rotating shaft.
[0005] In one of the blade structures described above, the locking part is a boss provided on the rotating shaft, and the outer contour of the boss matches the shape of the inner wall of the hollow part.
[0006] In one of the blade structures described above, the boss has a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall. The first sidewall and the third sidewall are arranged opposite each other and are arc-shaped. The second sidewall and the fourth sidewall are also arranged opposite each other. The two ends of the first sidewall are connected to the second sidewall and the fourth sidewall respectively by arc transitions. The two ends of the third sidewall are also connected to the second sidewall and the fourth sidewall respectively by arc transitions. The second sidewall and the fourth sidewall each include a first straight surface, a first arc surface, a second arc surface, and a second straight surface. One end of the first straight surface is tangent to one end of the first arc surface, the other end of the first arc surface is tangent to one end of the second arc surface, and the other end of the second arc surface is tangent to one end of the second straight surface.
[0007] In one of the blade structures described above, a disc-shaped structure is also provided on the rotating shaft. The disc-shaped structure and the snap-fit part are arranged close to each other along the axial direction of the rotating shaft and are integrally formed. The end face of the disc-shaped structure abuts against one side of the blade to limit the blade.
[0008] In one of the blade structures described above, a first connecting portion extending in the axial direction is provided at one end of the rotating shaft near the blade.
[0009] In one of the blade structures described above, an external thread is provided on the outer circumferential surface of the first connecting part, a first locking nut is connected to the first connecting part, and the end face of the first locking nut abuts against the side of the blade away from the disc-shaped structure, for axial fixing of the blade.
[0010] In one of the blade structures described above, the end of the rotating shaft near the drive wheel is provided with a toothed structure along the circumferential direction.
[0011] In one of the blade structures described above, the drive wheel has a through hole at its center, and the inner wall of the through hole has an internal tooth structure that matches the tooth structure. The drive wheel is sleeved on the rotating shaft through the through hole, and the tooth structure meshes with the internal tooth structure.
[0012] In one of the blade structures described above, a protective sleeve is also provided on the support frame. The protective sleeve has a through hole inside. The protective sleeve is fitted onto the rotating shaft through the through hole, and one end of the protective sleeve abuts against the support frame, while the other end abuts against one side of the drive wheel.
[0013] In one of the blade structures described above, a second connecting part extending axially is provided at one end of the rotating shaft near the drive wheel. An external thread is provided on the outer circumferential surface of the second connecting part. A second locking nut is connected to the second connecting part, and the end face of the second locking nut abuts against the side of the drive wheel away from the protective sleeve.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] (1) By setting a hollow part on the blade and setting a snap-fit part on the rotating shaft that matches the inner wall contour of the hollow part, the snap-fit part and the hollow part snap-fit together, thereby effectively preventing relative rotation between the blade and the rotating shaft, and improving the stability of the connection and the reliability of the transmission.
[0016] (2) The snap-fit part is composed of a polygonal outline formed by the first side wall, the second side wall, the third side wall and the fourth side wall, and the side walls are connected by a circular arc transition, which enhances the fitting accuracy with the cut-out part of the blade and improves the stability of the connection. At the same time, the structure forms a non-circular snap-fit interface with multiple contact surfaces through the combination of multiple planes and arc surfaces, which can effectively prevent circumferential slippage or offset between the blade and the rotating shaft, and significantly improve the power transmission efficiency and operational safety.
[0017] (3) By setting a disc-shaped structure on the rotating shaft and using a locking nut to limit the blade in both directions in the axial direction, the blade can be effectively prevented from moving or shifting in the axial direction during high-speed rotation, thereby significantly improving the stability and safety of the blade during operation. Attached Figure Description
[0018] Figure 1 This is a 3D view of the proposed solution;
[0019] Figure 2 yes Figure 1 A 3D view of the hidden part of the structure;
[0020] Figure 3 This is a 3D view of the rotating shaft in this design;
[0021] Figure 4 This is a 3D view of the drive wheel in this design.
[0022] In the diagram, 1. Support frame; 2. Blade; 3. Rotating shaft; 4. Drive wheel; 5. Hollowed-out part; 6. Snap-fit part; 7. First side wall; 8. Second side wall; 9. Third side wall; 10. First straight surface; 11. First arc surface; 12. Second arc surface; 13. Second straight surface; 14. Disc-shaped structure; 15. First connecting part; 16. First locking nut; 17. Toothed structure; 18. Perforation; 19. Internal toothed structure; 20. Protective sleeve; 21. Second connecting part; 22. Second locking nut. Detailed Implementation
[0023] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0024] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0025] like Figures 1 to 4 As shown, this solution provides a blade structure, including: a support frame 1, a blade 2 rotatably mounted on the support frame 1, a rotating shaft 3 passing through the support frame 1, one end of the rotating shaft 3 being connected to the blade 2, and the other end being connected to a drive wheel 4; wherein, the blade 2 is provided with a hollowed-out portion 5, and the rotating shaft 3 is provided with a snap-fit portion 6 that matches the contour of the inner sidewall of the hollowed-out portion 5; the drive wheel 4 is connected to a drive device and drives the blade 2 to rotate through the rotating shaft 3; the snap-fit portion 6 snaps into the hollowed-out portion 5 to prevent relative rotation between the blade 2 and the rotating shaft 3.
[0026] During operation, the drive device rotates the rotating shaft 3 via the drive wheel 4. The rotating shaft 3, through its locking part 6, engages with the hollow part 5 on the blade 2, transmitting rotational power to the blade 2 for cutting, thinning, or trimming of materials. During the rotation of the blade 2 by the rotating shaft 3, the tight fit between the locking part 6 and the hollow part 5 effectively prevents relative rotation between the blade 2 and the rotating shaft 3, thereby improving the stability and safety of the connection and ensuring that the blade 2 rotates synchronously with the rotating shaft 3, avoiding slippage or deviation. This structure not only helps maintain the normal operation of the equipment and improves cutting accuracy but also ensures that the processing quality meets the expected requirements. It also prevents the blade 2 from falling off or shifting due to unexpected relative rotation between the blade 2 and the rotating shaft 3, thus avoiding equipment damage or safety accidents.
[0027] Furthermore, the snap-fit part 6 is a boss provided on the rotating shaft 3, the outer contour of which matches the shape of the inner wall of the hollow part 5, and is used to snap-fit with the hollow part 5 to prevent relative rotation between the blade 2 and the rotating shaft 3, thereby improving the stability and safety of the connection.
[0028] Furthermore, the boss has a first sidewall 7, a second sidewall 8, a third sidewall 9, and a fourth sidewall. The first sidewall 7 and the third sidewall 9 are arranged opposite each other and are arc-shaped. The second sidewall 8 and the fourth sidewall are arranged opposite each other. The two ends of the first sidewall 7 are connected to the second sidewall 8 and the fourth sidewall respectively through arc transitions. The two ends of the third sidewall 9 are also connected to the second sidewall 8 and the fourth sidewall respectively through arc transitions. The second sidewall 8 and the fourth sidewall each include a first straight surface 10, a first arc surface 11, a second arc surface 12, and a second straight surface 13. Among them, one end of the first straight surface 10 is tangent to one end of the first arc surface 11, the other end of the first arc surface 11 is tangent to one end of the second arc surface 12, and the other end of the second arc surface 12 is tangent to one end of the second straight surface 13.
[0029] The boss on the rotating shaft 3 forms a polygonal outline through the first side wall 7, the second side wall 8, the third side wall 9, and the fourth side wall, and the side walls are connected by arc transitions, which enhances the fitting accuracy with the hollow part 5 of the blade 2 and improves the stability of the connection. The boss forms a non-circular snap-fit interface with multiple contact surfaces by combining multiple straight and arc surfaces, which can effectively prevent circumferential slippage or offset between the blade 2 and the rotating shaft 3, significantly improve power transmission efficiency and operational safety, and is suitable for cutting equipment applications with high speed and high precision requirements.
[0030] Furthermore, a disc-shaped structure 14 is also provided on the rotating shaft 3. The disc-shaped structure 14 and the snap-fit part 6 are arranged close to each other along the axial direction of the rotating shaft 3 and are integrally formed. When the blade 2 is installed by cooperating with the snap-fit part 6 through the hollow part 5, one side of it is in contact with the end face of the disc-shaped structure 14, thereby realizing the axial positioning of the blade 2.
[0031] Furthermore, a first connecting part 15 extending in the axial direction is provided at one end of the rotating shaft 3 near the blade 2. An external thread is provided on the outer circumferential surface of the first connecting part 15. A first locking nut 16 is connected to the first connecting part 15, and the end face of the first locking nut 16 abuts against the side of the blade 2 away from the disc-shaped structure 14, for axial fixing of the blade 2.
[0032] The specific steps for installing the blade 2 on the support frame 1 are as follows: First, align and snap the hollow part 5 on the blade 2 with the boss on the rotating shaft 3. At this time, one side of the blade 2 contacts the end face of the disc-shaped structure 14. Then, screw the first locking nut 16 into the first connecting part 15 until it abuts against the other side of the blade 2, thereby achieving axial fixation of the blade 2 on the rotating shaft 3 and completing the installation of the blade 2. Through the above installation method, the blade 2 can be quickly and accurately positioned and connected to the rotating shaft 3. The snap-fit between the hollow part 5 and the boss not only achieves circumferential fixation between the blade 2 and the rotating shaft 3, but also effectively... To prevent relative rotation between the two and ensure the stability and synchronization of power transmission, it also helps to improve assembly efficiency. The disc-shaped structure 14 and the first locking nut 16 provide bidirectional axial restraint for the blade 2, which effectively prevents the blade 2 from axially shifting or deviating during high-speed rotation, thereby significantly improving the stability and safety of the blade 2. In addition, no complicated tools or additional fasteners are required during installation. The blade 2 can be securely installed simply by snap-fitting and threaded locking, which simplifies the assembly process, reduces maintenance costs, and is suitable for various cutting equipment applications.
[0033] Furthermore, a toothed structure 17 is provided along the circumferential direction at one end of the rotating shaft 3 near the drive wheel 4. A through hole 18 is provided at the center of the drive wheel 4, and an internal toothed structure 19 matching the toothed structure 17 is provided on the inner wall of the through hole 18. The drive wheel 4 is sleeved on the rotating shaft 3 through the through hole 18, and a stable connection is achieved through the meshing of the toothed structure 17 and the internal toothed structure 19. This toothed connection method achieves circumferential fixation between the drive wheel 4 and the rotating shaft 3, effectively preventing relative rotation between the two during operation, thereby ensuring the continuity and efficiency of power transmission. The precise fit between the toothed structure 17 and the internal toothed structure 19 also helps to improve the running stability of the drive wheel 4 when rotating at high speed, reduce vibration and noise, reduce wear, and thus extend the overall service life of the equipment. It is suitable for industrial scenarios with high requirements for transmission accuracy and stability.
[0034] Furthermore, a protective sleeve 20 is also provided on the support frame 1. The protective sleeve 20 has a through hole inside. The protective sleeve 20 is sleeved on the rotating shaft 3 through the through hole. One end of the protective sleeve 20 abuts against the support frame 1, and the other end abuts against one side of the drive wheel 4.
[0035] The protective sleeve 20 not only provides excellent protection for the rotating shaft 3, effectively preventing dust, debris, and other foreign objects from entering the transmission area, thus extending the service life of the equipment; it also axially limits the drive wheel 4, preventing it from shifting or loosening during high-speed operation, thereby improving the stability and safety of the transmission system. In addition, the protective sleeve 20 adopts a central through-hole structure, which facilitates assembly and disassembly, and maintains a certain clearance fit with the rotating shaft 3, without affecting the normal rotation of the rotating shaft 3. One end of it is attached to the support frame 1, and the other end is tightly attached to the drive wheel 4, forming a closed protective space, which further improves the cleanliness and operational reliability of the whole machine, and is suitable for industrial environments with high dust, high speed, or continuous operation.
[0036] Furthermore, a second connecting part 21 extending axially is provided at one end of the rotating shaft 3 near the drive wheel 4. The outer circumference of the second connecting part 21 is provided with external threads. A second locking nut 22 is connected to the second connecting part 21, and the end face of the second locking nut 22 abuts against the side of the drive wheel 4 away from the protective sleeve 20. By providing a second connecting part 21 with external threads on the rotating shaft 3 and using the second locking nut 22 to axially press and fix the drive wheel 4, not only is the reliable positioning of the drive wheel 4 on the rotating shaft 3 achieved, but it can also effectively prevent the drive wheel 4 from loosening or shifting during high-speed rotation, thereby improving the stability and safety of the transmission system.
[0037] It should be noted that in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0038] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0039] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.
Claims
1. A blade structure, characterized by include: A support frame is provided, on which the blade is rotatably mounted. A rotating shaft is also provided on the support frame, with one end connected to the blade and the other end connected to a drive wheel. The blade has a hollowed-out portion, and the rotating shaft has a locking part that matches the contour of the inner sidewall of the hollowed-out portion. The drive wheel is connected to a drive device and drives the blade to rotate via the rotating shaft. The locking part engages with the hollowed-out portion to prevent relative rotation between the blade and the rotating shaft.
2. The blade structure of claim 1, wherein The snap-fit part is a boss provided on the rotating shaft, and the outer contour of the boss matches the shape of the inner wall of the hollow part.
3. The blade structure of claim 2, wherein The boss has a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall. The first sidewall and the third sidewall are arranged opposite each other and are arc-shaped. The second sidewall and the fourth sidewall are arranged opposite each other. The two ends of the first sidewall are connected to the second sidewall and the fourth sidewall by arc transitions. The two ends of the third sidewall are also connected to the second sidewall and the fourth sidewall by arc transitions. The second sidewall and the fourth sidewall each include a first straight surface, a first arc surface, a second arc surface, and a second straight surface. One end of the first straight surface is tangent to one end of the first arc surface, the other end of the first arc surface is tangent to one end of the second arc surface, and the other end of the second arc surface is tangent to one end of the second straight surface.
4. The blade structure of claim 1 wherein, The rotating shaft is also provided with a disc-shaped structure, which is arranged close to the snap-fit part along the axial direction of the rotating shaft and is an integrally formed structure. The end face of the disc-shaped structure abuts against one side of the blade to limit the blade.
5. The blade structure of claim 4, wherein The rotating shaft has a first connecting portion extending in the axial direction at one end near the blade.
6. The blade structure of claim 5, wherein The outer circumferential surface of the first connecting part is provided with an external thread, and the first locking nut is connected to the first connecting part. The end face of the first locking nut abuts against the side of the blade away from the disc-shaped structure, which is used to fix the blade axially.
7. The blade structure of claim 1 wherein, The rotating shaft has a toothed structure along the circumferential direction at one end near the drive wheel.
8. The blade structure of claim 7, wherein, The drive wheel has a through hole at its center, and the inner wall of the through hole has an internal tooth structure that matches the tooth structure. The drive wheel is sleeved on the rotating shaft through the through hole, and the tooth structure meshes with the internal tooth structure.
9. The blade structure of claim 1 wherein, The support frame is also provided with a protective sleeve, which has a through hole inside. The protective sleeve is fitted onto the rotating shaft through the through hole, with one end of the protective sleeve abutting against the support frame and the other end abutting against one side of the drive wheel.
10. The blade structure of claim 9, wherein The rotating shaft is provided with a second connecting part extending axially at one end near the drive wheel. The outer circumferential surface of the second connecting part is provided with an external thread. A second locking nut is connected to the second connecting part, and the end face of the second locking nut abuts against the side of the drive wheel away from the protective sleeve.