CN219705275U

CN219705275U - Hair trimmer

Info

Publication number: CN219705275U
Application number: CN202321155813.9U
Authority: CN
Inventors: 王杜艳; 郑相九; 肖红春
Original assignee: Zhuoyashi Electronics Shenzhen Co ltd
Current assignee: Zhuoyashi Electronics Shenzhen Co ltd
Priority date: 2023-05-12
Filing date: 2023-05-12
Publication date: 2023-09-19
Anticipated expiration: 2033-05-12

Abstract

The utility model relates to the technical field of daily necessities, in particular to a hair trimmer. The device comprises a shell, an inner shell, a head cover, a PCB main board, a guide comb adjusting device, a cutter head assembly and a first driving motor for driving the cutter head assembly, wherein the guide comb adjusting device and the first driving motor are respectively connected with the PCB main board; the PCB main board controls the second driving motor to enable the transmission mechanism to drive the push rod support to move up and down, and meanwhile enables the guide comb connected with the push rod support to move up and down. Therefore, the hair cutter can keep the hair with different lengths according to different requirements of users to flexibly and automatically adjust, is simple to operate and more convenient to use, and effectively reduces the production cost.

Description

Hair trimmer

Technical Field

The utility model relates to the technical field of daily necessities, in particular to a hair trimmer.

Background

The trimming length of the existing hair trimmers on the market is fixed, and the trimming length cannot be flexibly adjusted according to the length of hair or beard, so that the hair trimmers with various functions are required to be equipped by users, which easily causes the problems of mess placement and confusion use, complicated operation, inconvenient use and the like.

Disclosure of Invention

The technical problems to be solved by the utility model are as follows: so as to solve the problems that the existing hair trimmer can not be flexibly adjusted according to the length of hair or beard, and the like.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides a hair trimmer, includes casing, inner housing, skull, PCB mainboard, direction comb adjusting device, tool bit subassembly, is used for driving the first driving motor of tool bit subassembly, direction comb adjusting device with first driving motor respectively with the PCB mainboard is connected, the skull can dismantle set up in the top of casing, inner housing, direction comb adjusting device, tool bit subassembly and first driving motor install in the casing with the cavity that the skull encloses; the guide comb adjusting device comprises a guide comb, a push rod support, a transmission mechanism and a second driving motor for driving the transmission mechanism, wherein the push rod support is slidably arranged in the inner shell, one end of the push rod support is connected with the guide comb, the push rod support and the second driving motor are respectively connected with the transmission mechanism, and the PCB main board is connected with the second driving motor; the PCB main board controls the second driving motor to enable the transmission mechanism to drive the push rod support to move up and down, and meanwhile enables the guide comb connected with the push rod support to move up and down.

The transmission mechanism comprises a fixed mounting frame, a gear set, a transmission shaft lever, a limiting rod and a transmission shaft sleeve piece sleeved on the transmission shaft lever and the limiting rod, wherein the gear set is rotatably arranged at the top end of the fixed mounting frame, the second driving motor is assembled on one side of the fixed mounting frame, and the transmission shaft lever and the limiting rod are assembled on the other side of the fixed mounting frame; the top of the transmission shaft lever is provided with a transmission gear, the transmission gear is meshed with the gear set, a motor shaft of the second driving motor is provided with a driving gear, and the driving gear is meshed with the gear set.

The transmission shaft sleeve is provided with a convex column and a limiting device, the convex column is arranged at the front end of the transmission shaft sleeve, the limiting device is arranged at the rear end of the transmission shaft sleeve, an annular groove is formed in the convex column, the push rod support is provided with a groove hole matched with the annular groove, and the groove hole is sleeved on the annular groove.

The inner shell comprises an inner shell, an inner cover and a battery, first groove strips are arranged on two sides of the inner shell, first raised strips matched with the first groove strips are arranged on the inner walls of two sides of the push rod support, and the first raised strips are movably connected with the first groove strips; the back of inner shell is equipped with the second recess strip, the inner wall of push rod support be equipped with the second sand grip that matches the second recess strip, the second sand grip with second recess strip swing joint.

The accommodating cavity of the inner shell is provided with a transmission mechanism groove, a battery groove and a circuit board groove, the transmission mechanism is arranged in the transmission mechanism groove, the battery is arranged in the battery groove, and the PCB main board is arranged in the circuit board groove; the back of the inner shell is outwards extended to be provided with a groove seat, the transmission mechanism groove corresponds to the groove seat in position, and a notch is formed in the corresponding position of the transmission mechanism groove and the groove seat; the groove seat is provided with a flexible waterproof sleeve and a fastener, the flexible waterproof sleeve is provided with a first through hole, and the fastener is used for fixing the flexible waterproof sleeve on the groove seat through a bolt; the annular groove of the convex column sequentially penetrates through the notch and the first through hole to be buckled and fixed with the groove hole of the push rod bracket; the top end of the inner shell is provided with a motor groove in an upward extending mode, and the first driving motor is arranged in the motor groove; the inner shell is in tight buckling connection with the inner cover, and a first waterproof sealing ring is arranged between the inner shell and the inner cover.

The head cover is provided with a plurality of mounting holes, the guide comb is sleeved on the head cover assembly and is positioned in the mounting holes of the head cover, the guide comb and a part of the head cover assembly extend out of the mounting holes of the head cover, a gap is formed between the mounting holes of the head cover and the head cover assembly, and the guide comb is positioned in the gap.

The cutter head assembly comprises at least two groups of movable cutter groups, a connecting rod, a gear transmission shaft sleeve, a gear mounting rack, an inert gear and a cutter head support seat, wherein the movable cutter groups are detachably connected to the top end of the gear transmission shaft sleeve, one end of the connecting rod is fixed to the movable cutter groups through bolts, the other end of the connecting rod penetrates through the gear transmission shaft sleeve and is connected with the cutter head support seat, and the cutter head support seat is fixed to the top end of the motor groove through bolts; the gear mounting frame is sleeved on the gear of the gear transmission shaft sleeve, the gear of the gear transmission shaft sleeve is meshed with the inert gear, and the gear of the first driving motor is meshed with the inert gear.

The gear mounting frame is provided with a plurality of gear notches and a positioning part extending upwards, a gear of the gear transmission shaft sleeve is positioned in the gear notches, the positioning part is provided with a plurality of first positioning holes, the middle of the positioning part is provided with a second positioning hole, and the bottom of the gear mounting frame is provided with a plurality of third positioning holes; the cutter head support seat is provided with a plurality of guide posts, a boss, a plurality of first positioning posts, a notch and a placing groove, the placing groove is provided with a second through hole and a positioning rod, the inert gear is provided with a third through hole, the inert gear is arranged in the placing groove, the third through hole and the second positioning hole are sleeved on the positioning rod, and the gear of the first driving motor extends out of the second through hole and is meshed with the inert gear; the gear transmission shaft sleeve is sleeved on the boss, the boss is provided with a clamping hole, the other end of the connecting rod is provided with a clamping groove matched with the clamping hole, and the clamping hole is inserted into the clamping groove to be matched and fixed; the first locating hole of gear mounting bracket is overlapped and is located on the guide post, the third locating hole cover is located first locating post.

The guide comb comprises a guide comb body and a guide support, wherein the guide comb body is provided with a plurality of clamping grooves, the guide support is provided with a buckle matched with the clamping grooves, two sides of the guide support are downwards extended to be provided with first connecting plates, the first connecting plates are provided with fourth positioning holes, two sides of the push rod support are upwards extended to be provided with second connecting plates, the second connecting plates are provided with second positioning columns matched with the fourth positioning holes, two sides of the top end of the motor groove are provided with positioning grooves, and the fourth positioning holes of the first connecting plates sequentially penetrate through the slotted holes and the positioning grooves to be connected with the second positioning columns of the push rod support; the guide comb is provided with a fifth positioning hole which is matched and fixed with the guide post, and the fifth positioning hole of the guide comb is sleeved on the guide post.

The shell comprises a front shell and a rear shell, the front shell is connected with the rear shell through buckling, and a second waterproof sealing ring is arranged between the front shell and the rear shell; the PCB mainboard is equipped with adjusting button and switch, the preceding shell is equipped with adjusting button spare and shift knob spare, adjusting button spare with adjusting button connects, shift knob spare with switch connects.

The beneficial effects of the utility model are as follows: in the hair trimmer provided by the utility model, the guide comb is arranged in a gap between the mounting hole of the head cover and the cutter head assembly, the push rod support is slidably arranged on the inner shell, one end of the push rod support is connected with the guide comb, the push rod support and the second driving motor are respectively connected with the transmission mechanism, and the PCB main board is connected with the second driving motor; therefore, the second driving motor is controlled by the PCB main board to drive the push rod support to move up and down, and the guide comb connected with the push rod support is moved up and down, so that the function of automatically adjusting the guide comb is achieved, the hairs with different lengths can be reserved according to different requirements of users for flexible and automatic adjustment, the operation is simple, the use is more convenient, and the production cost is effectively reduced.

Drawings

Fig. 1 is a schematic exploded view of a hair trimmer according to an embodiment of the present utility model.

Fig. 2 is a schematic view showing a part of the structure of a hair trimmer according to the embodiment of the present utility model.

Fig. 3 is a schematic diagram of another view of fig. 2.

Fig. 4 is a schematic structural view of a transmission mechanism of a hair trimmer according to an embodiment of the present utility model.

Fig. 5 is a schematic diagram of another view of fig. 4.

Fig. 6 is a schematic structural view of a cutter head assembly of a hair trimmer according to an embodiment of the present utility model.

Fig. 7 is a schematic structural view of an inner housing of a hair trimmer provided in an embodiment of the present utility model.

Fig. 8 is a schematic structural view of a cutter head assembly of a hair trimmer according to an embodiment of the present utility model.

Fig. 9 is a schematic perspective view of a hair trimmer provided in an embodiment of the present utility model.

Detailed Description

In order to make the objects, technical solutions and advantageous effects of the present utility model more apparent, the present utility model will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

In order to illustrate the technical scheme of the utility model, the following description is made by specific examples.

Referring to fig. 1 to 9, a hair trimmer 100 provided in an embodiment of the present utility model includes a housing 10, an inner housing 20, a head cover 50, a PCB main board 60, a guide comb adjusting device 30, a cutter head assembly 40, and a first driving motor 70 for driving the cutter head assembly 40, wherein the guide comb adjusting device 30 and the first driving motor 70 are respectively connected with the PCB main board 60, the head cover 50 is detachably disposed at the top end of the housing 10, and the inner housing 20, the guide comb adjusting device 30, the cutter head assembly 40 and the first driving motor 70 are mounted in a cavity enclosed by the housing 10 and the head cover 50; the guide comb adjusting device 30 includes a guide comb 31, a push rod bracket 32, a transmission mechanism 80, and a second driving motor 33 for driving the transmission mechanism 80, wherein the push rod bracket 32 is slidably disposed in the inner housing 20, one end of the push rod bracket 32 is connected with the guide comb 31, the push rod bracket 32 and the second driving motor 33 are respectively connected with the transmission mechanism 80, and the PCB main board 60 is connected with the second driving motor 33; the second driving motor 33 is controlled by the PCB main board 60 to drive the push rod support 32 to move up and down, and meanwhile, the guide comb 31 connected with the push rod support 32 is moved up and down, so that the function of automatically adjusting the guide comb is achieved, and the hairs with different lengths can be reserved for flexible automatic adjustment according to different requirements of users.

In the embodiment of the present utility model, the transmission mechanism 80 includes a fixed mounting frame 81, a gear set 82, a transmission shaft 83, a limiting rod 84, and a transmission shaft sleeve member 85 sleeved on the transmission shaft 83 and the limiting rod 84, wherein the gear set 82 is rotatably disposed at the top end of the fixed mounting frame 81, the second driving motor 33 is assembled on one side of the fixed mounting frame 81, and the transmission shaft 83 and the limiting rod 84 are assembled on the other side of the fixed mounting frame 81; the top of the transmission shaft 83 is provided with a transmission gear 831, the transmission gear 831 is meshed with the gear set 82, a driving gear 331 is provided on a motor shaft of the second driving motor 33, and the driving gear 331 is meshed with the gear set 82. The transmission shaft sleeve member 85 is provided with a convex column 851 and a limiting device 852, the convex column 851 is arranged at the front end of the transmission shaft sleeve member 85, the limiting device 852 is arranged at the rear end of the transmission shaft sleeve member 85, the convex column 851 is provided with an annular groove 853, the push rod support 32 is provided with a slot 321 matched with the annular groove 853, and the slot 321 is sleeved on the annular groove 853.

In the embodiment of the present utility model, the inner housing 20 includes an inner housing 21, an inner cover 22 and a battery 23, wherein first groove strips 24 are provided on two sides of the inner housing 21, first raised strips 322 matched with the first groove strips 24 are provided on two side inner walls of the push rod support 32, and the first raised strips 322 are movably connected with the first groove strips 24; the back of the inner shell 21 is provided with a second groove strip 25, the inner wall of the push rod bracket 32 is provided with a second raised strip 323 matched with the second groove strip 25, and the second raised strip 323 is movably connected with the second groove strip 25.

In the embodiment of the present utility model, the accommodating cavity of the inner case 21 is provided with a transmission mechanism groove, a battery groove and a circuit board groove, the transmission mechanism 80 is arranged in the transmission mechanism groove, the battery 23 is arranged in the battery groove, and the PCB main board 60 is arranged in the circuit board groove; the back of the inner shell 21 is provided with a groove seat 26 in an outward extending mode, the transmission mechanism groove corresponds to the groove seat 26 in position, and a notch 27 is formed in the corresponding position of the transmission mechanism groove and the groove seat 26; the groove seat 26 is provided with a flexible waterproof sleeve 261 and a fastener 262, the flexible waterproof sleeve 261 is provided with a first through hole 263, and the fastener 262 is used for fixing the flexible waterproof sleeve 261 to the groove seat 26 through a bolt; the annular groove 853 of the convex column sequentially passes through the notch 27 and the first through hole 263 to be buckled and fixed with the slotted hole 321 of the push rod bracket; the top end of the inner shell 21 is provided with a motor groove 28 in an upward extending mode, and the first driving motor 70 is arranged in the motor groove 28; the inner shell 21 and the inner cover 22 are tightly fastened and fixedly connected with each other, and a first waterproof sealing ring is arranged between the inner shell 21 and the inner cover 22, so that water inflow is effectively prevented.

In the embodiment of the present utility model, the head cover 50 is provided with a plurality of mounting holes 51, the guide comb 31 is sleeved on the tool bit assembly 40 and is located in the mounting holes 51 of the head cover, a part of the guide comb 31 and the tool bit assembly 40 extends out of the mounting holes 51 of the head cover, a gap is provided between the mounting holes 51 of the head cover and the tool bit assembly 40, and the guide comb 31 is located in the gap and is used for moving the guide comb 31 up and down.

In the embodiment of the present utility model, the cutter head assembly 40 includes at least two sets of movable cutter groups 41, a connecting rod 42, a gear driving sleeve 43, a gear mounting frame 44, an idler gear 45 and a cutter head support 46, wherein the movable cutter groups 41 are detachably connected to the top ends of the gear driving sleeve 43, one end of the connecting rod 42 is fixed to the movable cutter groups 41 through bolts, the other end of the connecting rod 42 passes through the gear driving sleeve 43 and is connected with the cutter head support 46, and the cutter head support 46 is fixed to the top ends of the motor slots 28 through bolts; the gear mounting frame 44 is sleeved on the gear 431 of the gear driving shaft sleeve 43, the gear 431 of the gear driving shaft sleeve is meshed with the inert gear 45, and the gear 71 of the first driving motor is meshed with the inert gear 45. When the first driving motor is started, the inert gear is transmitted to the gear of the first driving motor, the inert gear is transmitted to the gear of the gear transmission shaft sleeve, and the movable blade of the movable blade group arranged on the gear transmission shaft sleeve is driven to rotate, so that a shearing effect is achieved.

In the embodiment of the present utility model, the gear mounting frame 44 is provided with a plurality of gear slots 441, and a positioning portion 442 extending upward, the gear 431 of the gear driving sleeve is located in the gear slots 441, the positioning portion 442 is provided with a plurality of first positioning holes 443, a second positioning hole 444 is provided in the middle of the positioning portion, and a plurality of third positioning holes (not shown) are provided at the bottom of the gear mounting frame 44; the tool bit support seat 46 is provided with a plurality of guide posts 461, a boss 462, a plurality of first positioning posts 463, a notch 464 and a placing groove 465, the placing groove 465 is provided with a second through hole and a positioning rod 466, the inert gear 45 is provided with a third through hole 451, the inert gear 45 is arranged in the placing groove 465, the third through hole 451 and the second positioning hole 444 are sleeved on the positioning rod 466, and the gear 71 of the first driving motor extends out of the second through hole and is meshed with the inert gear 45; the gear transmission shaft sleeve 43 is sleeved on the boss 462, the boss 462 is provided with a clamping hole 467, the other end of the connecting rod 42 is provided with a clamping groove 421 matched with the clamping hole 467, and the clamping hole 467 is inserted into the clamping groove 421 to be matched and fixed; the first positioning hole 443 of the gear mounting rack is sleeved on the guide post 461, and the third positioning hole is sleeved on the first positioning post 463.

In the embodiment of the present utility model, the guide comb 31 includes a guide comb body 311 and a guide bracket 312, the guide comb body 311 is provided with a plurality of clamping grooves 313, the guide bracket 312 is provided with a buckle 314 adapted to the clamping grooves 313, two sides of the guide bracket 312 are provided with a first connecting plate 315 in a downward extending manner, the first connecting plate 315 is provided with a fourth positioning hole 316, two sides of the push rod bracket 32 are provided with a second connecting plate 324 in an upward extending manner, the second connecting plate 324 is provided with a second positioning post 325 matched with the fourth positioning hole 316, two sides of the top end of the motor slot 28 are provided with positioning grooves 281, and the fourth positioning hole 316 of the first connecting plate sequentially passes through the slotted hole 321 and the positioning groove 281 to be connected with the second positioning post 325 of the push rod bracket; the guide comb 31 is provided with a fifth positioning hole 317 adapted to be fixed with the guide post 461, and the fifth positioning hole 317 of the guide comb is sleeved on the guide post 461.

In the embodiment of the present utility model, the casing 10 includes a front casing 11 and a rear casing 12, the front casing 11 and the rear casing 12 are fixedly connected by buckling, and a second waterproof sealing ring is arranged between the front casing 11 and the rear casing 12; the PCB main board 60 is provided with an adjusting key 61 and a power switch 62, the adjusting key 61 is used for controlling the guide comb 31 to ascend or descend, the inner cover 22 is provided with an adjusting key sleeve 221 and a power switch sleeve 222, the front shell 11 is provided with an adjusting button piece 13 and a switch button piece 14, the adjusting button piece 13 penetrates through the adjusting key sleeve 221 to be connected with the adjusting key 61, and the switch button piece 14 penetrates through the power switch sleeve 222 to be connected with the power switch 62.

In the hair trimmer provided by the utility model, the guide comb is arranged in a gap between the mounting hole of the head cover and the cutter head assembly, the push rod support is slidably arranged on the inner shell, one end of the push rod support is connected with the guide comb, the push rod support and the second driving motor are respectively connected with the transmission mechanism, and the PCB main board is connected with the second driving motor; therefore, the second driving motor is controlled by the PCB main board to drive the push rod support to move up and down, and the guide comb connected with the push rod support is moved up and down, so that the function of automatically adjusting the guide comb is achieved, the hairs with different lengths can be reserved according to different requirements of users for flexible and automatic adjustment, the operation is simple, the use is more convenient, and the production cost is effectively reduced.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims

1. A hair trimmer characterized by: the guide comb comprises a shell, an inner shell, a head cover, a PCB main board, a guide comb adjusting device, a cutter head assembly and a first driving motor for driving the cutter head assembly, wherein the guide comb adjusting device and the first driving motor are respectively connected with the PCB main board, the head cover is detachably arranged at the top end of the shell, and the inner shell, the guide comb adjusting device, the cutter head assembly and the first driving motor are arranged in a cavity enclosed by the shell and the head cover; the guide comb adjusting device comprises a guide comb, a push rod support, a transmission mechanism and a second driving motor for driving the transmission mechanism, wherein the push rod support is slidably arranged in the inner shell, one end of the push rod support is connected with the guide comb, the push rod support and the second driving motor are respectively connected with the transmission mechanism, and the PCB main board is connected with the second driving motor; the PCB main board controls the second driving motor to enable the transmission mechanism to drive the push rod support to move up and down, and meanwhile enables the guide comb connected with the push rod support to move up and down.

2. A hair trimmer according to claim 1 wherein said drive mechanism comprises a fixed mounting frame, a gear set rotatably disposed on a top end of said fixed mounting frame, a drive shaft lever, a stop lever, and a drive shaft sleeve member disposed over said drive shaft lever and stop lever, said second drive motor being mounted on one side of said fixed mounting frame, said drive shaft lever and said stop lever being mounted on the other side of said fixed mounting frame; the top of the transmission shaft lever is provided with a transmission gear, the transmission gear is meshed with the gear set, a motor shaft of the second driving motor is provided with a driving gear, and the driving gear is meshed with the gear set.

3. A hair trimmer according to claim 2 wherein said drive shaft assembly is provided with a post and a limiting means, said post being disposed at the front end of said drive shaft assembly, said limiting means being disposed at the rear end of said drive shaft assembly, said post being provided with an annular recess, said pusher carriage being provided with a slot adapted to said annular recess, said slot being disposed over said annular recess.

4. A hair trimmer according to claim 3 wherein said inner housing comprises an inner housing, an inner cover and a battery, wherein first groove strips are provided on both sides of said inner housing, first raised strips matched with said first groove strips are provided on both side inner walls of said push rod support, and said first raised strips are movably connected with said first groove strips; the back of inner shell is equipped with the second recess strip, the inner wall of push rod support be equipped with second recess strip assorted second sand grip, the second sand grip with second recess strip swing joint.

5. A hair trimmer according to claim 4 wherein said housing cavity of said inner housing is provided with a drive mechanism slot, a battery slot and a circuit board slot, said drive mechanism being disposed in said drive mechanism slot, said battery being disposed in said battery slot, said PCB main board being disposed in said circuit board slot; the back of the inner shell is outwards extended to be provided with a groove seat, the transmission mechanism groove corresponds to the groove seat in position, and a notch is formed in the corresponding position of the transmission mechanism groove and the groove seat; the groove seat is provided with a flexible waterproof sleeve and a fastener, the flexible waterproof sleeve is provided with a first through hole, and the fastener is used for fixing the flexible waterproof sleeve on the groove seat through a bolt; the annular groove of the convex column sequentially penetrates through the notch and the first through hole to be buckled and fixed with the groove hole of the push rod bracket; the top end of the inner shell is provided with a motor groove in an upward extending mode, and the first driving motor is arranged in the motor groove; the inner shell is in tight buckling connection with the inner cover, and a first waterproof sealing ring is arranged between the inner shell and the inner cover.

6. A hair trimmer according to claim 5 wherein said head cover is provided with a plurality of mounting holes, said guide comb is disposed over said head cover assembly and is disposed within said head cover mounting holes, a portion of said guide comb and said head cover assembly extends out of said head cover mounting holes, a gap is provided between said head cover mounting holes and said head cover assembly, and said guide comb is disposed within said gap.

7. A hair trimmer according to claim 6 wherein said bit assembly comprises at least two sets of moving blade sets removably connected to the top end of said gear drive housing, a connecting rod having one end secured to said moving blade sets by bolts and the other end of said connecting rod passing through said gear drive housing and connected to said bit support base, a gear drive housing, a gear mounting bracket, a idler gear and a bit support base secured to the top end of said motor slot by bolts; the gear mounting frame is sleeved on the gear of the gear transmission shaft sleeve, the gear of the gear transmission shaft sleeve is meshed with the inert gear, and the gear of the first driving motor is meshed with the inert gear.

8. A hair trimmer according to claim 7 wherein said gear mounting bracket is provided with a plurality of gear notches and upwardly extending positioning portions, said gear of said gear sleeve being positioned within said gear notches, said positioning portions being provided with a plurality of first positioning holes, a second positioning hole being provided intermediate said positioning portions, and a plurality of third positioning holes being provided at the bottom of said gear mounting bracket; the cutter head support seat is provided with a plurality of guide posts, a boss, a plurality of first positioning posts, a notch and a placing groove, the placing groove is provided with a second through hole and a positioning rod, the inert gear is provided with a third through hole, the inert gear is arranged in the placing groove, the third through hole and the second positioning hole are sleeved on the positioning rod, and the gear of the first driving motor extends out of the second through hole and is meshed with the inert gear; the gear transmission shaft sleeve is sleeved on the boss, the boss is provided with a clamping hole, the other end of the connecting rod is provided with a clamping groove matched with the clamping hole, and the clamping hole is inserted into the clamping groove to be matched and fixed; the first locating hole of gear mounting bracket is overlapped and is located on the guide post, the third locating hole cover is located first locating post.

9. A hair trimmer according to claim 8 wherein said guide comb comprises a guide comb body and a guide bracket, said guide comb body having a plurality of slots, said guide bracket having a catch adapted to said slots, said guide bracket having first connecting plates extending downwardly from both sides thereof, said first connecting plates having fourth locating holes, said push rod bracket having second connecting plates extending upwardly from both sides thereof, said second connecting plates having second locating posts engaging said fourth locating holes, said motor slot having locating grooves on both sides of its top end, said fourth locating holes of said first connecting plates passing sequentially through said slots and said locating grooves for connection with said second locating posts of said push rod bracket; the guide comb is provided with a fifth positioning hole which is matched and fixed with the guide post, and the fifth positioning hole of the guide comb is sleeved on the guide post.

10. A hair trimmer according to claim 1 wherein said housing comprises a front shell and a rear shell, said front shell being snap-fit to said rear shell, a second water-tight seal being provided between said front shell and said rear shell; the PCB mainboard is equipped with adjusting button and switch, the preceding shell is equipped with adjusting button spare and shift knob spare, adjusting button spare with adjusting button connects, shift knob spare with switch connects.