Integrated rotary cutter head assembly with in-line motor and trimmer

Abstract

The application relates to an integrated rotary cutter head assembly of an embedded motor and a trimming tool, wherein a relatively independent shearing chamber and a power chamber are arranged in a base, during assembly, the motor can be installed in the power chamber, the rotating shaft of the motor extends into the shearing chamber, the moving cutter is placed in the shearing chamber and is coaxially arranged with the rotating shaft outside the rotating shaft of the motor, then, the static cutter element is installed at the port of the base and the shearing chamber is closed by the static cutter. By adopting the structure, the static cutter element, the moving cutter element and the rotating shaft of the motor can be coaxially arranged by the base, the assembly precision of the moving cutter and the static cutter is guaranteed, the trimming performance of the rotary cutter head assembly is improved, the frictional resistance generated by the moving cutter during the rotary cutting along the static cutter is reduced, the surface temperature rise of the static cutter and the moving cutter is reduced, the skin is prevented from being scalded due to the high surface temperature rise of the static cutter, and the use safety and comfort of the rotary cutter head assembly are improved.

Description

Technical Field

[0001] This invention relates to a trimming device for trimming beards and other hair, and more specifically to an integrated rotary blade assembly with an embedded motor and a trimming tool, which is mainly used in the field of hair trimming tools such as razors and hair trimmers. Background Technology

[0002] Existing trimming tools mainly consist of a body and a rotating blade assembly, which is detachably connected to the body. To improve the user's feel and experience during use, the stationary blade in the existing rotating blade assembly is generally convex, and the rotating cutting surface of the corresponding moving blade is also curved. Because both are curved surfaces, the coaxiality of the stationary and moving blades is crucial during assembly. Any deviation in coaxiality will reduce the fitting accuracy between the stationary and moving blades, affecting not only their trimming performance but also increasing frictional resistance when the moving blade rotates along the inner surface of the stationary blade. This leads to a rise in surface temperature of both the stationary and moving blades, causing a burning sensation on the user's skin and reducing overall comfort and user experience.

[0003] Furthermore, since the existing motor that drives the moving blade to rotate along the stationary blade is installed inside the machine body and is a separate structure from the rotating blade assembly, when the rotating blade assembly is detachably fixed to the machine body, the coaxiality of the motor output shaft with the stationary and moving blades cannot be guaranteed due to the assembly tolerance between the rotating blade assembly and the machine body. When the moving blade is assembled on the motor output shaft, the fit tolerance between the moving blade and the stationary blade is further amplified, resulting in a significant reduction in the fit accuracy between the moving blade and the stationary blade and an increase in frictional resistance. This causes the surface temperature of the stationary and moving blades to rise, causing a burning sensation on the user's skin and reducing the user's skin feel and user experience. Summary of the Invention

[0004] Based on the above technical deficiencies, the present invention provides an integrated rotary cutter head assembly with an embedded motor and a trimming tool. This cutter head assembly changes the traditional assembly structure, which can effectively improve the coaxiality of the stationary blade, the moving blade and the drive motor, improve the matching accuracy between the moving blade and the stationary blade, and reduce the frictional resistance between the moving blade and the stationary blade, thereby improving the user's skin feel and experience.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is an integrated rotary cutter head assembly with an embedded motor, comprising:

[0006] A stationary blade element, comprising a stationary blade that comes into contact with the skin, the stationary blade being fixed to a stationary blade holder;

[0007] The moving tool element has at least one moving tool, which is installed in the moving tool holder and can always maintain contact with the inner surface of the stationary tool under the action of external force;

[0008] The motor has a rotating shaft that drives the moving blade holder to rotate, so that the moving blade mounted in the moving blade holder and the stationary blade form a rotary cutting motion.

[0009] The base has independent shear chambers and power chambers; among them,

[0010] The motor is installed in the power chamber, and its shaft extends into the shearing chamber. The moving blade element is placed in the shearing chamber and fixed on the outer circumference of the motor shaft to form a coaxial configuration. The stationary blade element is connected to the end of the base and closes the shearing chamber inside the base, so that the moving blade element, the stationary blade element and the motor shaft are arranged coaxially, and the stationary blade element, the moving blade element and the base are integrated into a whole that can be assembled and disassembled synchronously.

[0011] Optionally, the base includes an outer shell with two through-ends and a cup-shaped inner liner. The inner liner is fitted inside the outer shell and its open end edge is fixedly connected to the port edge of one end of the outer shell. The internal space of the inner liner is a shearing chamber. The cavity inside the outer shell located below the inner liner is a power chamber. The motor is installed at the bottom of the inner liner, and its rotating shaft passes through the inner liner and is placed inside the inner liner.

[0012] Optionally, a limiting ring protruding from the outer shell is provided at the opening end of the inner bushing. The limiting ring has connecting threads on its side wall, and the stationary knife element is detachably threaded to the limiting ring.

[0013] Optionally, a motor compartment is formed at the bottom of the inner bushing. Part of the motor compartment protrudes along the bottom of the shear chamber, while the rest extends toward the power chamber. The motor is installed in the motor compartment and fixedly connected to the inner bushing with screws.

[0014] Optionally, a fan impeller is provided in the shearing chamber. The fan impeller is sleeved outside the motor shaft and fixedly connected to the shaft. Multiple fan blades are formed on the fan impeller.

[0015] Optionally, an outwardly deflected window is provided on a partial side wall of the inner bushing. One end of the window is integrally connected to the side wall of the inner bushing, and the other end is integrally connected to the inner wall of the outer shell, so that a chip discharge port is formed on the bottom side wall of the inner bushing for connecting the shearing chamber and the power chamber.

[0016] Optionally, the outer shell is a hollow cylinder, the outer diameter of the cup-shaped inner liner is smaller than the inner diameter of the outer shell, and multiple connecting ribs connected to the inner wall of the outer shell are provided on the outer wall of the cup-shaped inner liner.

[0017] Optionally, a protruding connecting sleeve is provided at the center of the fan impeller. The connecting sleeve is fitted outside the motor shaft and rotates synchronously with the shaft. An adapter sleeve is provided at the bottom of the moving blade holder. The adapter sleeve is movably fitted outside the connecting sleeve and rotates synchronously with the connecting sleeve.

[0018] Optionally, the stationary blade has an outwardly convex arc surface, and the moving blade has three blades. Each moving blade has a cutting edge that matches the outwardly convex arc surface of the stationary blade. The three moving blades are evenly distributed in a ring in the moving blade holder with the axis of rotation as the reference, and the cutting edge of the moving blade is always in contact with the inner surface of the stationary blade under the action of the elastic element.

[0019] Based on the aforementioned rotary cutter head assembly, this application also proposes a technical solution for a trimming tool, including the aforementioned integrated rotary cutter head assembly with an embedded motor.

[0020] The beneficial effects of this invention are achieved by setting relatively independent shearing chambers and power chambers within the base. During assembly, the motor can be installed in the power chamber, with its shaft extending into the shearing chamber. The moving blade can be placed within the shearing chamber and fitted around the motor shaft, forming a coaxial configuration. Then, the stationary blade element is installed at the port of the base, and the shearing chamber is sealed by the stationary blade. This structure not only allows the stationary blade element, moving blade element, and motor shaft to be coaxially arranged with the help of the base, ensuring the assembly accuracy of the moving and stationary blades and improving the trimming performance of the rotary cutter head assembly, but also reduces the frictional resistance generated by the moving blade during rotational cutting along the stationary blade, lowers the surface temperature rise of the stationary and moving blades, avoids excessive surface temperature rise of the stationary blade causing a burning sensation on the skin, and improves the safety and comfort of using the rotary cutter head assembly. Attached Figure Description

[0021] Figure 1 This is a perspective view of the integrated rotary cutter head assembly with an embedded motor according to an embodiment of the present invention.

[0022] Figure 2 This is a cross-sectional view of the integrated rotary cutter head assembly with an embedded motor according to an embodiment of the present invention.

[0023] Figure 3 This is a three-dimensional cross-sectional view of the integrated rotary cutter head assembly with an embedded motor according to an embodiment of the present invention.

[0024] Figure 4 This is a planar structural diagram of the base in an embodiment of the present invention.

[0025] Figure 5 for Figure 4 Three-dimensional sectional view of section AA

[0026] Figure 6 for Figure 4 3D sectional view of the middle BB section

[0027] Figure 7 This is a three-dimensional structural diagram of the chip discharge port in the shearing chamber according to an embodiment of the present invention.

[0028] Figure 8 This is a three-dimensional structural diagram of the power chamber in the base in an embodiment of the present invention.

[0029] Figure 9 This is a three-dimensional sectional view of the stationary blade element in an embodiment of the present invention.

[0030] Figure 10 This is a three-dimensional structural diagram of the fan impeller in an embodiment of the present invention. Detailed Implementation

[0031] To make the technical objectives, technical solutions, and technical effects of the present invention clearer, the following will be described in conjunction with the appendix. Figures 1-10 Specific embodiments of the present invention will be described in further detail so that those skilled in the art can implement or use the present invention.

[0032] like Figures 1-10 As shown, the present invention is an integrated rotary blade assembly with an embedded motor, including a stationary blade element 10 and a stationary blade 11 that contacts the skin. The stationary blade 11 has several spaced meshes for capturing hair such as beards. The stationary blade 11 is fixed on a stationary blade seat 12.

[0033] The moving blade element 20 has at least one moving blade 21, which is installed in the moving blade holder 22. Under the action of external force, the moving blade 21 can always maintain contact with the inner surface of the stationary blade 11 to form a shearing force.

[0034] The motor 30 has a rotating shaft 31, which drives the moving blade holder 22 to rotate, so that the moving blade 21 installed in the moving blade holder 22 and the stationary blade 11 form a rotating cutting motion, cutting off hairs such as beards that extend into the mesh of the stationary blade 11, thereby realizing the trimming performance of the rotating blade assembly.

[0035] The base 40 has an independent shearing chamber 41 and a power chamber 42. The motor 30 is installed in the power chamber 42, and its shaft 31 extends into the shearing chamber 41. The moving blade element 20 is placed in the shearing chamber 41 and fixed to the outer periphery of the shaft 31 of the motor 30 to form a coaxial configuration. The stationary blade element 10 is connected to the end of the base 40 and closes the shearing chamber 41 inside the base 40, so that the moving blade element 20, the stationary blade element 10 and the shaft 31 of the motor 30 are arranged coaxially, and the stationary blade element 10, the moving blade element 20 and the base 40 are integrated into a whole that can be assembled and disassembled synchronously. By setting relatively independent shearing chamber 41 and power chamber 42 within the base 40, during assembly, the motor 30 can be installed in the power chamber 42, with its rotating shaft 31 extending into the shearing chamber 41; while the moving blade 21 can be placed inside the shearing chamber 41 and sleeved outside the rotating shaft 31 of the motor 30, forming a coaxial configuration with the rotating shaft 31; then, the stationary blade element 10 is installed at the port of the base 40, and the shearing chamber 41 is sealed by the stationary blade 11. This structure not only allows the stationary blade element 10, the moving blade element 20, and the rotating shaft 31 of the motor 30 to be coaxially arranged with the help of the base 40, ensuring the assembly accuracy of the moving blade 21 and the stationary blade 11 and improving the trimming performance of the rotary blade assembly, but also reduces the frictional resistance generated by the moving blade 21 during rotational cutting along the stationary blade 11, reducing the surface temperature rise of the stationary blade 11 and the moving blade 21, preventing excessive surface temperature rise of the stationary blade 11 from causing a burning sensation on the skin, and improving the safety and comfort of using the rotary blade assembly.

[0036] Furthermore, since the stationary blade element 10, the moving blade element 20, and the motor 30 are all installed inside the base 40, while ensuring coaxiality, the stationary blade element 10, the moving blade element 20, the motor 30, and the base 40 form a whole that can be disassembled and assembled synchronously. This not only protects the safety of the moving blade element 20 and the motor 30, but also facilitates production and assembly, and improves the convenience of use, cleaning, and maintenance for users.

[0037] like Figures 4-6As shown, in order to achieve the coaxial arrangement of the stationary blade element 10, the moving blade element 20 and the rotating shaft 31 of the motor 30, the base 40 includes a shell 43 with both ends through and a cup-shaped inner bushing 44. The inner bushing 44 is embedded in the shell 43 and its open end edge is fixedly connected to the port edge of one end of the shell 43. The internal space of the inner bushing 44 is the shearing chamber 41. The cavity located below the inner bushing 44 in the shell 43 is the power chamber 42. The motor 30 is installed at the bottom of the inner bushing 44 and its rotating shaft 31 passes through the inner bushing 44 and is placed in the inner bushing 44. By setting the base 40 as an outer shell 43 and a cup-shaped inner bushing 44, and fixing one end of the inner bushing 44 to one end of the outer shell 43 to form an integral unit, when the stationary blade element 10 is installed at the port of the outer shell 43, the stationary blade 11 can block the port of the inner bushing 44, so that a relatively closed shearing chamber 41 is formed inside the inner bushing 44; and due to the isolation of the inner bushing 44, a power chamber 42 can be formed inside the outer shell 43; when the motor 30 is assembled, it can be fixedly installed by means of the bottom of the inner bushing 44, so that the motor 30 is in the power chamber 42 inside the outer shell 43, and the rotating shaft 31 of the motor 30 can extend into the shearing chamber 41 in the inner bushing 44, which facilitates driving the moving blade element 20 to rotate and cut relative to the stationary blade element 10. This structure not only protects the moving blade element 20 and the motor 30 with the outer shell 43, ensuring their safety during use, but also allows the rotating shafts 31 of the stationary blade element 10, the moving blade element 20, and the motor 30 to be coaxially configured, ensuring the fitting accuracy of the stationary blade 11 and the moving blade 21 and reducing the surface temperature rise of the stationary blade 11. Furthermore, it allows the stationary blade element 10, the moving blade element 20, the motor 30, and the base 40 to be disassembled and assembled synchronously as a whole, improving the efficiency of disassembly and assembly and making it easier for users to use.

[0038] like Figures 5-6 As shown, to facilitate the fixing and sealing of the shearing chamber 41 between the stationary blade element 10 and the base 40, a limiting ring 45 protruding from the outer shell 43 is provided at the opening end of the inner bushing 44. The limiting ring 45 has connecting threads on its sidewall, allowing the stationary blade element 10 to be detachably threadedly connected to the limiting ring 45. By providing a limiting ring 45 protruding from the outer shell 43 at the opening end of the inner bushing 44 and providing connecting threads on the sidewall of the limiting ring 45, the stationary blade element 10 can be threadedly connected to the limiting ring 45 to seal the shearing chamber 41 during assembly. This ensures the safety of the moving blade element 20 while also facilitating the collection of sheared debris. In actual production, the stationary blade seat 12 in the stationary blade element 10 is threadedly connected to the limiting ring 45, and the stationary blade 11 is fixed inside the stationary blade seat 12. Of course, in addition to threaded connections, the stationary blade element 10 can also be detachably connected to the outer shell 43 of the base 40 using methods such as snap-fit, hook-fit, or plug-in connections.

[0039] like Figure 5 , 6As shown in Figure 8, to improve the installation firmness of the motor 30 and ensure its safe use, a motor compartment 46 is formed at the bottom of the inner bushing 44. Part of the motor compartment 46 protrudes along the bottom of the shearing chamber 41, while the rest extends towards the power chamber 42. The motor 30 is installed inside the motor compartment 46 and fixedly connected to the inner bushing 44 with screws. By controlling the partial protrusion of the motor compartment 46 along the bottom of the shearing chamber 41, the base 40 can be adjusted as a whole for assembly and disassembly during motor 30 assembly, improving the user's grip comfort when using the trimming tool. The remaining part of the motor compartment 46 extends towards the power chamber 42, relatively increasing its depth, facilitating the positioning of the motor 30 during assembly, and improving assembly efficiency. Furthermore, due to the increased depth of the motor compartment 46, the side walls of the motor compartment 46 prevent the motor 30 from swinging during operation, improving the installation firmness and operational stability of the motor 30 and the base 40.

[0040] The rotary head assembly has multiple applications, such as shavers, epilators, or trimmers. During use, regardless of the application, the beard, hair, or downy hair needs to be inserted into the stationary blade 11 to be cut by the moving blade element 20. However, due to the limited mesh size of the stationary blade 11, some curly hairs or soft, long downy hairs are difficult to insert into the stationary blade 11, resulting in reduced trimming efficiency of the rotary head assembly. Therefore, if... Figure 2 , 3 As shown in Figure 10, a fan impeller 50 is provided in the shearing chamber 41. The fan impeller 50 is sleeved outside the rotating shaft 31 of the motor 30 and fixedly connected to the rotating shaft 31. Multiple fan blades 51 are formed on the fan impeller 50. By adding the fan impeller 50 in the shearing chamber 41 and sleeved the fan impeller 50 outside the rotating shaft 31 of the motor 30, when the motor 30 is started, the moving blade holder 22 and the fan impeller 50 can rotate synchronously with the rotating shaft 31 of the motor 30. When the moving blade holder 22 drives the moving blade 21 to rotate and cut along the stationary blade 11, the fan blades 51 on the fan impeller 50 rotate and compress air to form a negative pressure in the shearing chamber 41. The negative pressure is used to draw long hairs or down that are not easy to penetrate into the mesh of the stationary blade 11 into the mesh of the stationary blade 11, thereby improving the hair introduction efficiency of the stationary blade 11 and improving the trimming efficiency of the rotating blade head assembly.

[0041] To prevent the disorderly splashing of sheared hair fragments within the shearing chamber 41, such as Figures 6-8As shown, an outwardly deflected window 47 is provided on a partial side wall of the inner bushing 44. One end of the window 47 is integrally connected to the side wall of the inner bushing 44, and the other end is integrally connected to the inner wall of the outer casing 43, so that a chip discharge port 48 is formed on the bottom side wall of the inner bushing 44, which is used to connect the shearing chamber 41 and the power chamber 42. By providing an outwardly deflected window 47 on the side wall of the inner bushing 44, a chip discharge port 48 is formed on the inner bushing 44. When the rotating shaft 31 of the motor 30 drives the moving blade holder 22 and the fan impeller 50 to rotate, the moving blade holder 22 can synchronously drive the moving blade 21 to rotate and cut along the stationary blade 11. When hair or fuzz such as beards is cut by the moving blade 21, it can enter the power chamber 42 of the outer casing 43 through the chip discharge port 48 for temporary collection and storage, avoiding disorderly splashing of hair or fuzz such as beards, and improving the comfort of using the rotating blade assembly. Secondly, the window leaf 47 can also reinforce the inner bushing 44. One end of it is connected to the side wall of the inner bushing 44 as a whole, and the other end is connected to the inner wall of the outer shell 43. During the operation of the motor 30, the window leaf 47 can prevent the inner bushing 44 from shaking and improve the working stability of the rotating cutter head assembly.

[0042] During operation, the high-speed rotation of the motor 30 causes a significant increase in vibration in the rotary cutter assembly. To prevent the inner bushing 44 from wobbling and affecting the fit accuracy between the moving cutter element 20 and the stationary cutter element 10, as follows... Figures 5-8 As shown, the outer shell 43 is a hollow cylinder, and the outer diameter of the cup-shaped inner liner 44 is smaller than the inner diameter of the outer shell 43. Multiple connecting ribs 49, which connect to the inner wall of the outer shell 43, are provided on the outer wall of the inner liner 44. By providing multiple connecting ribs 49 on opposite sides between the outer wall of the inner liner 44 and the inner wall of the outer shell 43, the connection between the inner liner 44 and the outer shell 43 can be effectively strengthened, preventing the inner liner 44 from shaking during the rotation of the motor 30. This ensures the matching accuracy of the moving blade element 20 and the stationary blade element 10, improves trimming performance while reducing frictional resistance, lowers the surface temperature rise of the stationary blade 11, and improves user comfort.

[0043] After a period of use, the cutting edges of the moving blades 21 in the moving blade element 20 are prone to wear, making the moving blades 21 consumables. To facilitate the replacement and maintenance of the moving blade element 20, such as Figures 2-3As shown, a protruding connecting sleeve 52 is provided at the center of the fan impeller 50. The connecting sleeve 52 is fitted outside the rotating shaft 31 of the motor 30 and rotates synchronously with the rotating shaft 31. A transition sleeve 23 is provided at the bottom of the moving blade holder 22. The transition sleeve 23 is movably fitted outside the connecting sleeve 52 and rotates synchronously with the connecting sleeve 52. By setting the connecting sleeve 52 on the fan impeller 50 and using the transition sleeve 23 at the bottom of the moving blade holder 22 to fit outside the connecting sleeve 52, when the rotating shaft 31 of the motor 30 rotates and drives the fan impeller 50 to rotate, the transition sleeve 23 of the moving blade holder 22 can be synchronously driven to rotate under the action of the connecting sleeve 52. This causes the moving blade 21 mounted on the moving blade holder 22 to rotate and cut along the inner surface of the stationary blade 11, realizing the trimming performance of the rotating blade assembly. At the same time, when replacement is needed, the transition sleeve 23 can be pulled out from the connecting sleeve 52 at any time, which facilitates the replacement and maintenance of the moving blade element 20.

[0044] To improve the user's feel and comfort when using the rotary cutter head assembly, such as Figures 2-3 As shown, the stationary blade 11 has a convex arc surface in its cross-section. By setting the cross-section of the stationary blade 11 to an convex arc surface, the user experiences greater comfort when the stationary blade 11 contacts and slides along the skin. To improve the trimming efficiency of the rotating blade assembly, the moving blade element 20 has three moving blades 21. Each moving blade 21 has a cutting edge that matches the convex arc surface of the stationary blade 11. The three moving blades 21 are evenly distributed in a ring around the axis of the rotating shaft 31 and are mounted in the moving blade holder 22. Under the action of an elastic element, the cutting edge of the moving blade 21 is kept in contact with the inner surface of the stationary blade 11. The elastic element can be a spring, a spring sheet, or a spring bar, etc.

[0045] Based on the aforementioned rotary cutter head assembly, this application also proposes a technical solution for a trimming tool, including the aforementioned integrated rotary cutter head assembly with an embedded motor.

[0046] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the specific implementation of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An integrated rotary cutter head assembly with an embedded motor, characterized in that... include: A static knife element (10) has a static knife (11) that comes into contact with the skin, and the static knife (11) is fixed on a static knife seat (12); The moving blade element (20) has at least one moving blade (21), which is installed in the moving blade holder (22) and can always maintain contact with the inner surface of the stationary blade (11) under the action of external force; The motor (30) has a rotating shaft (31) that can drive the moving blade holder (22) to rotate, so that the moving blade (21) installed in the moving blade holder (22) and the stationary blade (11) form a rotary cutting motion; The base (40) has an independent shear chamber (41) and a power chamber (42); wherein, The motor (30) is installed in the power chamber (42), and its shaft (31) extends into the shearing chamber (41). The moving blade element (20) is placed in the shearing chamber (41) and fixed on the outer periphery of the shaft (31) of the motor (30) to form a coaxial configuration. The stationary blade element (10) is connected to the end of the base (40) and seals the shearing chamber (41) inside the base (40), so that the moving blade element (20), the stationary blade element (10) and the shaft (31) of the motor (30) are arranged coaxially, and the stationary blade element (10), the moving blade element (20) and the base (40) are integrated into a whole that can be assembled and disassembled synchronously.

2. The integrated rotary cutter head assembly with an embedded motor according to claim 1, characterized in that... The base (40) includes a shell (43) that extends through both ends and a cup-shaped inner liner (44). The inner liner (44) is fitted inside the shell (43) and its open end edge is fixedly connected to the port edge of one end of the shell (43). The internal space of the inner liner (44) is a shear chamber (41). The cavity located below the inner liner (44) inside the shell (43) is a power chamber (42). The motor (30) is installed at the bottom of the inner liner (44), and its rotating shaft (31) passes through the inner liner (44) and is placed in the inner liner (44).

3. The integrated rotary cutter head assembly with an embedded motor according to claim 2, characterized in that... A limiting ring (45) protruding from the outer shell (43) is provided at the opening end of the inner bushing (44). The limiting ring (45) has connecting threads on its side wall, and the stationary knife element (10) is detachably threaded to the limiting ring (45).

4. The integrated rotary cutter head assembly with an embedded motor according to claim 2, characterized in that... A motor compartment (46) is formed at the bottom of the inner sleeve (44). The motor compartment (46) partially protrudes along the bottom of the shear chamber (41), and the rest extends toward the power chamber (42). The motor (30) is installed in the motor compartment (46) and fixedly connected to the inner sleeve (44) with screws.

5. The integrated rotary cutter head assembly with an embedded motor according to claim 1, characterized in that... A fan impeller (50) is provided in the shearing chamber (41). The fan impeller (50) is sleeved outside the rotating shaft (31) of the motor (30) and fixedly connected to the rotating shaft (31). Multiple fan blades (51) are formed on the fan impeller (50).

6. The integrated rotary cutter head assembly with an embedded motor according to claim 2 or 5, characterized in that... An outwardly deflected window leaf (47) is provided on a partial side wall of the inner bushing (44). One end of the window leaf (47) is connected to the side wall of the inner bushing (44) as a whole, and the other end is connected to the inner wall of the outer shell (43) as a whole, so that a chip discharge port (48) is formed on the bottom side wall of the inner bushing (44) for connecting the shearing chamber (41) and the power chamber (42).

7. The integrated rotary cutter head assembly with an embedded motor according to claim 2, characterized in that... The outer shell (43) is a hollow cylinder. The outer diameter of the cup-shaped inner liner (44) is smaller than the inner diameter of the outer shell (43). Multiple connecting ribs (49) connected to the inner wall of the outer shell (43) are provided on the outer wall of the cup of the inner liner (44).

8. The integrated rotary cutter head assembly with an embedded motor according to claim 5, characterized in that... A protruding connecting sleeve (52) is provided at the center of the fan impeller (50). The connecting sleeve (52) is fitted outside the rotating shaft (31) of the motor (30) and rotates synchronously with the rotating shaft (31). A transition sleeve (23) is provided at the bottom of the moving blade holder (22). The transition sleeve (23) is movably fitted outside the connecting sleeve (52) and rotates synchronously with the connecting sleeve (52).

9. The integrated rotary cutter head assembly with an embedded motor according to claim 1, characterized in that... The stationary knife (11) has an outwardly convex arc surface in its cross section. The moving knife (21) is provided with three blades. Each moving knife (21) has a cutting edge that matches the outwardly convex arc surface of the stationary knife (11). The three moving knives (21) are evenly distributed in a ring in the moving knife holder (22) with the axis of the rotating shaft (31) as the reference. Under the action of the elastic element, the cutting edge of the moving knife (21) is always in contact with the inner surface of the stationary knife (11).

10. A pruning tool, characterized in that... The integrated rotary cutter head assembly includes the embedded motor as described in any one of claims 1 to 9.

Images