CN214870746U - Hair trimmer - Google Patents

Abstract

The utility model provides a hair trimmer relates to the technical field of hair trimming equipment, should include hair trimmer and include main part shell, actuating mechanism and tool bit mechanism, and tool bit mechanism includes head shell and the trimming head subassembly of setting in the head shell, and the one end at the main part shell is connected to the head shell, and actuating mechanism installs in the main part shell, and actuating mechanism's power output shaft passes through universal head subassembly with the power input shaft of trimming head subassembly and is connected. When the coaxiality of the power output shaft of the driving mechanism and the power output shaft of the trimming head component is poor, the multidirectional freedom degrees of the trimming head component are not restricted and can be automatically corrected under the cooperation of the universal head component, and the coaxiality between two shafts is not deviated, so that the trimming head component can freely and smoothly run at a high speed, the noise of a tool bit is avoided, the excellent trimming sharpness is ensured, the processing yield of the power output shaft and the power input shaft is improved, and the production cost is reduced.

Description

Hair trimmer

Technical Field

The utility model belongs to the technical field of the hair trimming equipment technique and specifically relates to a hair trimmer is related to.

Background

The nose hair trimmer products are common articles in modern life, and the nose hair trimmer products trim hairs such as nose hair by driving a trimming head to rotate by a motor.

In the existing vibrissa trimmer products, the trimming cutter head and the motor shaft are generally connected by adopting an inserted shaft, and the concentricity requirement on matching shafts of the trimming cutter head, the motor shaft and the like is higher. In the production process, shaft waste is easy to generate due to the high requirement of concentricity, so that the manufacturing yield is reduced, and the manufacturing cost is increased. And in long-term use or assembly process, the connecting shaft often has the condition of a little deflection relatively the motor shaft, leads to easily appearing the noise to sharpness scheduling problem such as poor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a hair trimmer to solve the technical problem that nose hair trimmer class product manufacture yield that exists among the prior art is low, the noise appears easily.

The utility model provides a hair trimmer, including main part shell, actuating mechanism and tool bit mechanism, tool bit mechanism includes the head shell and sets up trimming head subassembly in the head shell, the head shell is connected the one end of main part shell, actuating mechanism installs in the main part shell, actuating mechanism's power output shaft with the power input shaft of trimming head subassembly passes through the connection of universal head subassembly.

Further, one of the output end of the power output shaft and the input end of the power input shaft is provided with a connecting groove, the other one of the output end of the power output shaft and the input end of the power input shaft is provided with a protruding head, the connecting groove and the protruding head form the universal head assembly, the protruding head is installed in the connecting groove, the protruding head and the connecting groove are relatively fixed in the circumferential direction of the power output shaft, so that the power output shaft and the power input shaft synchronously rotate under the action of the driving mechanism, and the protruding head can swing towards any point in the circumferential direction of the connecting groove, so that the protruding head can be adaptively connected with the connecting groove.

Further, the connecting groove is in clearance fit with the protruding head, and the protruding head can be separated from the notch of the connecting groove.

Furthermore, the cross section of the outer peripheral surface of the convex head is in a polygonal arrangement, and the outer peripheral surface of the convex head is in an arc arrangement along the axial direction of the power input shaft.

Further, the cross section of the outer circumferential surface of the protruding head gradually shrinks inwards from the connecting groove to the direction of the protruding head.

Further, the cross section of the connecting groove is in a multi-deformation arrangement matched with the protruding head.

Further, be provided with a plurality of trompils on the circumference lateral wall of spread groove, a plurality of trompils will the circumference lateral wall of spread groove is cut apart into a plurality of edges the sub-lateral wall that the circumference interval of spread groove set up, the quantity of trompil with the quantity of the polygon angle of protruding head is unanimous, a plurality of angles one-to-one of protruding head sets up in the trompil.

Further, the sub-side wall comprises an upper section and a lower section which are fixedly connected, the lower section is connected with the bottom wall of the connecting groove, the upper section is arranged corresponding to the notch of the connecting groove, the inner side surface of the upper section inclines outwards from the center of the connecting groove along the direction of the lower section pointing to the upper section, and the inner side surface of the upper section is arranged in an arc shape along the circumferential direction of the connecting groove;

the inner side surface of the lower section comprises a first side surface and a second side surface which are connected with each other, the first side surface and the second side surface are both perpendicular to the plane of the groove bottom wall of the connecting groove, the first side surface and the second side surface are arranged at an angle, the edge of the inner wall of the first side surface is close to and connected with the edge of the inner side surface of the second side surface, and any one of the first side surface of the lower section and the second side surface of the adjacent lower section is arranged at intervals.

Furthermore, a shaft block is fixed on the power output shaft, the connecting groove is arranged on the shaft block, and the central line of the connecting groove and the axis of the power output shaft are arranged in a collinear manner;

the power input shaft is fixedly provided with the convex head, and the central line of the convex head and the axis of the power input shaft are arranged in a collinear manner.

Furthermore, the driving mechanism comprises a motor, the power output shaft is connected with the motor, an installation cavity for installing the motor is arranged in the main body shell, a shaft hole communicated with the installation cavity is formed in one end, close to the head shell, of the main body shell, the motor is installed in the installation cavity, the output end of the power output shaft penetrates through the shaft hole and extends into the head shell, and the universal head assembly is arranged in the head shell;

the main body shell is detachably connected with the head shell, the power output shaft is detachably connected with the power input shaft through the universal head assembly, and the power output shaft, the universal head assembly and the power input shaft are connected through the main body shell and the head shell in a fixed mode.

The utility model provides a hair trimmer, including main part shell, actuating mechanism and tool bit mechanism, tool bit mechanism includes head shell and the trimming head subassembly of setting in the head shell, and the one end at the main part shell is connected to the head shell, and actuating mechanism installs in the main part shell, and actuating mechanism's power output shaft passes through the universal head subassembly with the power input shaft of trimming head subassembly and is connected. When hair such as nose hair is trimmed, a power output shaft of the driving mechanism drives the trimming head component to rotate through the universal head component so as to trim the hair. When the coaxiality of the power output shaft of the driving mechanism and the power output shaft of the trimming head component is poor, the multidirectional freedom degree of the trimming head component is not restricted under the matching of the power output shaft of the driving mechanism and the power input shaft of the trimming head component through the universal head component, the automatic correction can be realized, and the coaxiality between the two shafts is not deviated, so that the trimming head component can freely and smoothly run at a high speed, the noise of a tool bit is avoided, and the excellent trimming sharpness is ensured. In addition, the requirement on the machining precision of the power output shaft of the driving mechanism and the power input shaft of the trimming head assembly is reduced, the machining yield of the power output shaft and the power input shaft is improved, and the production cost is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is an isometric view of a body housing of a hair trimmer according to an embodiment of the present invention;

fig. 2 is an isometric view of a trimming head assembly of a hair trimmer according to an embodiment of the present invention;

fig. 3 is a cross-sectional view of a hair trimmer according to an embodiment of the present invention;

FIG. 4 is an enlarged view of section C of FIG. 3;

fig. 5 is a schematic cross-sectional view of a cutter head mechanism of a hair trimmer according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of a protruding head of a hair trimmer according to an embodiment of the present invention, projected along direction a of fig. 5;

fig. 7 is a schematic partial cross-sectional view of a main body housing for hair trimming according to an embodiment of the present invention;

fig. 8 is a cross-sectional view of a connecting slot of a hair trimmer according to an embodiment of the present invention, as projected along direction B of fig. 7;

fig. 9 is a schematic cross-sectional view illustrating a connecting groove of a hair trimmer according to an embodiment of the present invention and the protruding head.

Icon: 100-a body shell; 200-a motor; 210-a power take-off shaft; 300-a cutter head mechanism; 310-head shell; 320-a trimming head assembly; 321-a power input shaft; 400-a gimbal assembly; 410-a protruding head; 420-connecting groove; 421-opening holes; 422-subpart wall; 423-upper segment; 424-lower section; 425-a first side; 426-a second side; 427-axle block.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Examples

As shown in fig. 1 to 9, the present embodiment provides a hair trimmer including a main body housing 100, a driving mechanism and a cutter head mechanism 300, wherein the cutter head mechanism 300 includes a head housing 310 and a trimming cutter head assembly 320 disposed in the head housing 310, the head housing 310 is connected to one end of the main body housing 100, the driving mechanism is mounted in the main body housing 100, and a power output shaft 210 of the driving mechanism is connected to a power input shaft 321 of the trimming cutter head assembly 320 through a universal head assembly 400.

The main body case 100 is a main body. The driving mechanism is used for providing power to drive the trimming head assembly 320 to rotate, and the driving mechanism generally comprises a motor 200, and a power output shaft 210 is connected with the motor 200 and driven by the motor 200 to rotate. The cutter head mechanism 300 primarily effects hair cutting, and typically also has a fixed blade assembly that cooperates with a trimming head assembly 320, which is also disposed on the head housing 310. The hair is inserted into a gap between the fixed blade assembly and the trimming head assembly 320, and the trimming head assembly 320 is rotated by the driving of the motor 200 to cooperate with the fixed blade assembly to cut hair such as nasal hair.

When cutting hair such as nose hair, the power output shaft 210 of the driving mechanism of the hair trimmer of the present embodiment drives the trimming head assembly 320 to rotate through the universal head assembly 400, so as to trim hair. When the coaxiality of the power output shaft 210 of the driving mechanism and the power output shaft 210 of the trimming head component 320 is poor, the power output shaft 210 of the driving mechanism and the power input shaft 321 of the trimming head component 320 are matched through the universal head component 400, the multi-directional freedom degree of the trimming head component 320 is not restricted, automatic correction can be realized, and the coaxiality between the two shafts is not deviated, so that the trimming head component 320 can freely and smoothly run at a high speed, the noise of a tool bit is avoided, and the excellent trimming sharpness is ensured. In addition, the requirement for the machining accuracy of the power output shaft 210 of the driving mechanism and the power input shaft 321 of the trimming head assembly 320 is reduced, the machining yield of the power output shaft 210 and the power input shaft 321 is improved, and the production cost is reduced.

Specifically, one of the output end of the power output shaft 210 and the input end of the power input shaft 321 is provided with a connecting groove 420, the other is provided with a protruding head 410, the connecting groove 420 and the protruding head 410 form a universal head assembly 400, the protruding head 410 is installed in the connecting groove 420, the protruding head 410 and the connecting groove 420 are relatively fixed in the circumferential direction of the power output shaft 210, so that the power output shaft 210 and the power input shaft 321 synchronously rotate under the action of the driving mechanism, and the protruding head 410 can swing towards any point in the circumferential direction of the connecting groove 420, so that the protruding head 410 can be adaptively connected with the connecting groove 420.

In the present embodiment, as shown in fig. 3, the gimbal head assembly 400 includes a connection groove 420 fixed to the output end of the power output shaft 210 and a protruding head 410 fixed to the input end of the power input shaft 321, the protruding head 410 is installed in the connection groove 420, the protruding head 410 and the connection groove 420 are relatively fixed in the circumferential direction of the power output shaft 210, so that the power output shaft 210 and the power input shaft 321 rotate synchronously under the action of the motor 200, and the protruding head 410 can swing toward any point in the circumferential direction of the connection groove 420, so that the protruding head 410 can be adaptively connected to the connection groove 420.

In this embodiment, a shaft block 427 is fixed on the power output shaft 210, the connecting groove 420 is arranged on the shaft block 427, and the center line of the connecting groove 420 and the axis of the power output shaft 210 are arranged in a collinear manner; the power input shaft 321 is fixed with a convex head 410, and the central line of the convex head 410 is arranged in the same line with the axis of the power input shaft 321. In other words, the coupling groove 420 may be formed by a shaft block 427, that is, the shaft block 427 is welded or integrally molded at the output shaft of the power output shaft 210, and the coupling groove 420 is provided in a direction in which the shaft block 427 faces the head housing 310. The protruding head 410 is a protrusion welded or integrally formed on the input end of the power input shaft 321. When the motor 200 drives the power output shaft 210 to rotate, the connecting groove 420 and the power output shaft 210 rotate synchronously, and the connecting groove 420 and the protruding head 410 are relatively fixed in the circumferential direction, so that the protruding head 410 and the power input shaft 321 fixedly connected with the protruding head 410 rotate synchronously. The requirement that the power output shaft 210 transmits power to the power input shaft 321 of the trimming head assembly 320 is satisfied. Meanwhile, the protruding head 410 can swing towards any point in the circumferential direction of the connecting groove 420, that is, the protruding head 410 can swing with any straight line in a plane perpendicular to the power input shaft 321 (the power output shaft 210 is in axial direction with or substantially in axial direction with the power input shaft 321, so that the direction perpendicular to the power input shaft 321 can also be understood as being perpendicular to the power output shaft 210) as an axis. As will be understood from fig. 3 and 4, the convex head 410 can swing back and forth and right and left by 360 degrees about an arbitrary straight line on a horizontal plane. Through the swing of the protruding head 410 relative to the connection groove 420, the protruding head 410 can be adaptively connected with the connection groove 420 to ensure the power transmission between the power output shaft 210 and the power input shaft 321.

It should be noted that the positions of the protruding head 410 and the connecting groove 420 can be interchanged, that is, the protruding head 410 is installed on the power output shaft 210 of the motor 200, and the connecting groove 420 is installed on the power input shaft 321 of the trimming head assembly 320, in this way, the protruding head 410 and the connecting groove 420 can be matched in the manner described above.

In one implementation, a mounting cavity for mounting the motor 200 is provided in the main body casing 100, a shaft hole communicated with the mounting cavity is provided at one end of the main body casing close to the head casing 310, the motor 200 is mounted in the mounting cavity, the output end of the power output shaft 210 penetrates through the shaft hole and extends into the head casing 310, and the universal head assembly 400 is provided in the head casing 310. The main body case 100 is detachably connected to the head case 310, the power output shaft 210 is detachably connected to the power input shaft 321 through the universal head assembly 400, and the power output shaft 210, the universal head assembly 400 and the power input shaft 321 are connected to each other by fixing the main body case to the head case 310.

As shown in fig. 3, one end of the main body case close to the head case 310, that is, the head end of the main body case is provided with a connection clamping table, and the head case 310 is sleeved and clamped outside the connection clamping table of the main body case 100. The main body case is provided with a shaft hole corresponding to the inside of the connection clamping table, a bearing can be arranged in the shaft hole, the power output shaft 210 of the motor 200 is arranged in the bearing of the shaft hole in a penetrating manner, and the shaft block 427 connected with the output end of the power output shaft 210 extends into one end of the head case 310 close to the main body case 100. The coupling groove 420 is clearance-fitted with the projection head 410, and the projection head 410 can be disengaged from the coupling groove 420 from the notch of the coupling groove 420. When the head case 310 is coupled to the main body case 100, the protruding head 410 is pressed against and abutted against the coupling groove 420, and when the head case 310 is separated from the main body case 100, the protruding head 410 is freely separated from the coupling groove 420.

It can be understood that, when the cutter head mechanism 300 is disassembled, the trimming head assembly 320 and the main body connecting shaft, that is, the trimming head assembly 320 and the power output shaft 210 can automatically fall off, so that the problem of using safety caused by mistaken operation when the cutter head of the trimming head assembly 320 is connected to the power output shaft 210 when the head housing 310 is separated from the main body housing 100 can be avoided.

The relative fixation of the protruding head 410 and the connecting groove 420 in the circumferential direction can be achieved by various means, in one implementation manner, the cross section of the outer circumferential surface of the protruding head 410 is polygonal, and the outer circumferential surface of the protruding head 410 is arc-shaped along the axial direction of the power input shaft 321. Further, the cross section of the connection groove 420 is in a multi-deformation arrangement matching with the protruding head 410. Wherein, the cross section of the protruding head 410 and the cross section of the connecting groove 420 are both the cross section formed by cutting the protruding head 410 and the connecting groove 420 through the plane perpendicular to the axes of the power output shaft 210 and the power input shaft 321.

Specifically, as shown in FIG. 6, the raised head 410 is generally triangular in cross-section. The cross-section of the groove may then be in a substantially triangular manner. It can be understood that the multi-deformation corner-shaped matching can play a good role in rotation stopping and is convenient to assemble.

The outer peripheral surface of the protruding head 410 is disposed in an arc shape along the axial direction of the power input shaft 321, that is, as shown in fig. 5, the outer peripheral surface of the protruding head 410 is disposed in an arc shape along the up-down direction. Further, the cross-section of the outer circumferential surface of the protruding head 410 gradually shrinks inward from the coupling groove 420 toward the protruding head 410. It can be appreciated that the arc-shaped protrusion head 410 facilitates the clearance fit between the protrusion head 410 and the connection groove 420, so as to have better adaptive floating effect.

In a specific implementation of this embodiment, the cross section of the connection groove 420 of this embodiment is still substantially polygonal, but a plurality of openings 421 are provided on the circumferential side wall of the connection groove 420, the circumferential side wall of the connection groove 420 is divided into a plurality of sub-side walls 422 arranged at intervals along the circumferential direction of the connection groove 420 by the plurality of openings 421, the number of the openings 421 is consistent with the number of the polygonal corners of the protruding head 410, and the plurality of corners of the protruding head 410 are arranged in the openings 421 in a one-to-one correspondence manner. As shown in fig. 8, in the present embodiment corresponding to the protrusion head 410 having a substantially triangular cross section, the connection groove 420 is provided with three cut-outs 421, and the respective three cut-outs 421 divide the side wall of the connection groove 420 into three sub-side walls 422. As shown in fig. 9, three corners of the protruding head 410 are located at three positions of the opening 421 in a one-to-one correspondence manner, so that the protruding head 410 and the connecting groove 420 are relatively fixed in the circumferential direction by the limiting function of the opening 421.

Naturally, in the case of a solution in which the circumferential side wall of the connecting groove 420 is provided with a plurality of openings 421, the cross section of the connecting groove 420 may be in the shape of a ring interrupted at the openings 421, and a polygonal shape is not necessarily adopted.

As shown in fig. 1 and fig. 3, the sub-sidewall 422 of the present embodiment includes an upper segment 423 and a lower segment 424 that are fixedly connected, the lower segment 424 is connected to the bottom wall of the connecting groove 420, the upper segment 423 is disposed corresponding to the notch of the connecting groove 420, the inner side of the upper segment 423 inclines outward away from the center of the connecting groove 420 along the direction of the lower segment 424 pointing to the upper segment 423, and the inner side of the upper segment 423 is disposed in an arc shape along the circumferential direction of the connecting groove 420. It will be appreciated that the inner side of the upper segment 423 is curved and the notches are generally flared to facilitate insertion of the tab 410 into the attachment slot 420.

As shown in fig. 1 and 4, the inner side of the lower section 424 includes a first side 425 and a second side 426 connected to each other, the first side 425 and the second side 426 are both planes perpendicular to the groove bottom wall of the connecting groove 420, the first side 425 and the second side 426 are disposed at an angle, and the inner wall edge of the first side 425 and the inner side edge of the second side 426 are adjacent to each other and connected. Further, the first side surface 425 of any one of the lower segments 424 and the second side surface 426 of the adjacent lower segment 424 are spaced apart and arranged in parallel, wherein the gap between the first side surface 425 of one of the sub-sidewalls 422 and the second side surface 426 of the other sub-sidewall 422 is the opening 421 between the adjacent sub-sidewalls 422.

It will be appreciated that the first side 425 is primarily in abutment with the sides of the protruding head 410, and that the first side 425 and the second side 426 are configured to form an opening 421 having a length so as to facilitate a stop function in the circumferential direction of the protruding head 410.

The hair trimmer of the present embodiment is coupled to a universal shaft type connection by a universal head assembly 400, the protruding head 410 coupled to the power input shaft 321 of the trimming head assembly 320 is polygonal convex and polygonal in cross section (the polygon is a polygon of a triangle, a quadrangle or more), and the coupling groove 420 of the power output shaft 210 of the motor 200 is polygonal concave in cooperation therewith. When the coaxiality of the power input shaft 321 and the power output shaft 210 is poor, the cutter head in the trimming cutter head assembly 320 can be automatically corrected in the matching mode because the multidirectional freedom degrees are not restricted, and the coaxiality and the non-deviation between the two shafts are ensured, so that the cutter head can freely and smoothly run at a high speed, the noise of the cutter head is avoided, and the excellent trimming sharpness is ensured.

In summary, compared with the existing vibrissa clipping products, the clipping cutter head assembly 320 and the motor shaft (power output shaft 210) are connected by adopting a universal shaft type connection, so that the assembly requirement precision is low, the assembly operation is convenient, the production efficiency is improved, the noise problem of the hair clipper in the long-term use process is solved, the product quality is improved, and the manufacturing cost is greatly reduced. In addition, the universal shaft type connection is adopted, when the cutter head mechanism 300 is disassembled, the cutter head of the trimming cutter head assembly 320 and the power output shaft 210 of the motor 200 can automatically fall off, and the problem of safety in use caused by mistaken opening of the cutter head connected to the power output shaft 210 of the motor 200 is avoided.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A hair trimmer comprising a main body case (100), a driving mechanism and a cutter head mechanism (300), wherein the cutter head mechanism (300) comprises a cutter head case (310) and a trimmer cutter head assembly (320) arranged in the cutter head case (310), the cutter head case (310) is connected to one end of the main body case (100), the driving mechanism is installed in the main body case (100), and the hair trimmer is characterized in that a power output shaft (210) of the driving mechanism is connected with a power input shaft (321) of the trimmer cutter head assembly (320) through a universal head assembly (400).

2. The hair trimmer according to claim 1, characterized in that one of the output end of the power output shaft (210) and the input end of the power input shaft (321) is provided with a coupling slot (420) and the other is provided with a protruding head (410), the connection slot (420) and the nose (410) form the gimbal assembly (400), the convex head (410) is arranged in the connecting groove (420), the convex head (410) and the connecting groove (420) are relatively fixed in the circumferential direction of the power output shaft (210), so that the power output shaft (210) and the power input shaft (321) synchronously rotate under the action of the driving mechanism, and the protruding head (410) can swing towards any point of the circumferential direction of the connecting groove (420), so that the protruding head (410) can be adaptively connected with the connecting groove (420).

3. The hair trimmer according to claim 2, characterized in that the attachment slot (420) is a clearance fit with the protruding head (410) and the protruding head (410) is disengageable from the attachment slot (420) from its notch.

4. The hair trimmer according to claim 2 or 3, characterized in that the outer peripheral surface of the protruding head (410) is arranged in a polygonal shape in cross section, and the outer peripheral surface of the protruding head (410) is arranged in an arc shape in the axial direction of the power input shaft (321).

5. The hair trimmer according to claim 4, characterized in that the cross section of the outer circumferential surface of the protruding head (410) gradually tapers inwardly from the attachment slot (420) in a direction towards the protruding head (410).

6. The hair trimmer according to claim 4, characterized in that the cross section of the attachment slot (420) is in a multi-deformation arrangement matching the protruding head (410).

7. The hair trimmer according to claim 4, characterized in that a plurality of open holes (421) are provided on the circumferential side wall of the connecting groove (420), the plurality of open holes (421) divide the circumferential side wall of the connecting groove (420) into a plurality of sub-side walls (422) arranged at intervals in the circumferential direction of the connecting groove (420), the number of open holes (421) corresponds to the number of corners of the polygon of the protruding head (410), and the plurality of corners of the protruding head (410) are arranged in the open holes (421) in a one-to-one correspondence.

8. The hair trimmer according to claim 7, characterized in that the sub side wall (422) comprises an upper section (423) and a lower section (424) which are fixedly connected, the lower section (424) is connected with the bottom wall of the connecting groove (420), the upper section (423) is arranged corresponding to the notch of the connecting groove (420), the inner side surface of the upper section (423) is inclined outwards away from the center of the connecting groove (420) along the direction that the lower section (424) points to the upper section (423), and the inner side surface of the upper section (423) is arranged in an arc shape along the circumferential direction of the connecting groove (420);

the inner side surface of the lower section (424) comprises a first side surface (425) and a second side surface (426) which are connected with each other, the first side surface (425) and the second side surface (426) are planes which are perpendicular to the groove bottom wall of the connecting groove (420), the first side surface (425) and the second side surface (426) are arranged at an angle, the edge of the inner wall of the first side surface (425) and the edge of the inner side of the second side surface (426) are close to each other and connected, and the first side surface (425) of any one lower section (424) and the second side surface (426) of the adjacent lower section (424) are arranged at intervals.

9. The hair trimmer according to claim 2 or 3, characterized in that a shaft block (427) is fixed to the power take-off shaft (210), the connecting slot (420) being provided on the shaft block (427), the centre line of the connecting slot (420) being arranged co-linearly with the axis of the power take-off shaft (210);

the power input shaft (321) is fixedly provided with the protruding head (410), and the central line of the protruding head (410) and the axis of the power input shaft (321) are arranged in a collinear manner.

10. The hair trimmer according to any one of claims 1 to 3, characterized in that the driving mechanism comprises a motor (200), the power output shaft (210) is connected with the motor (200), a mounting cavity for mounting the motor (200) is arranged in the main body housing (100), a shaft hole communicated with the mounting cavity is arranged at one end of the main body housing (100) close to the head housing (310), the motor (200) is mounted in the mounting cavity, the output end of the power output shaft (210) extends into the head housing (310) through the shaft hole, and the gimbal assembly (400) is arranged in the head housing (310);

the main body shell (100) is detachably connected with the head shell (310), the power output shaft (210) is detachably connected with the power input shaft (321) through the universal head assembly (400), and the power output shaft (210), the universal head assembly (400) and the power input shaft (321) are connected through the main body shell (100) and the head shell (310) in a fixed mode.

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