Wrench adjusting mechanism of electric hair cutter

Abstract

The wrench adjusting mechanism of the electric hair cutter comprises a cutter head assembly and a wrench assembly, the cutter head assembly comprises a bottom plate and a fixed cutter frame, the wrench assembly comprises a wrench, a pin shaft and a spring, the inner end of the pin shaft is fixedly connected with the bottom plate, and the wrench is movably arranged outside the pin shaft in a sleeved mode. The wrench is in transmission connection with the fixed knife rest so as to drive the fixed knife rest to slide relative to the bottom plate, the wrench assembly further comprises a movable tooth block and a fixed tooth block, and the spring enables the movable tooth block to be meshed with the fixed tooth block all the time. The wrench is accurately positioned through cooperation of the movable tooth block and the fixed tooth block. The movable tooth block and the fixed tooth block are both made of plastic materials, so that the cost of the movable tooth block and the fixed tooth block is lower, the machining precision of the bevel tooth part of the movable tooth and the scattered teeth of the fixed tooth can be higher, and the problems that in the prior art, a bevel tooth part and a wrench or a pin shaft are integrated, the cost is high, the tooth surface of the bevel tooth part needs to be formed through punching, and the machining precision is poor are solved. The tooth surface precision of the bevel gear part is low, and the gear adjusting performance of the electric hair cutter is influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric hair clippers, in particular to a wrench adjustment mechanism of the electric hair clippers. Background Art

[0002] With the rapid development of the hairdressing market, the sales volume of electric hair clippers has increased significantly, and users are increasingly pursuing high-quality, easy-to-operate hair clippers. For existing electric hair clippers, they include a body and a cutter head assembly, the cutter head assembly is installed at the front end of the body, the cutter head assembly includes a bottom plate, a fixed blade holder, a movable blade holder, a fixed blade and a movable blade, the fixed blade is fixedly connected to the fixed blade holder, the movable blade is limitedly inserted in the movable blade holder or fixedly connected to the movable blade holder, the bottom plate is fixedly installed at the front end of the body, guide rails are respectively provided on both sides of the bottom plate, the fixed blade holder is slidably connected to the bottom plate through the guide rails, and an adjusting wrench is rotatably provided on one side of the fixed blade holder, and the fixed blade holder is controlled to move forward and backward relative to the bottom plate by adjusting the wrench to change the front and rear distance of the fixed blade relative to the movable blade, thereby achieving the effect of controlling the length of haircut.

[0003] For example, a wrench adjustment mechanism of an electric hair clipper disclosed in a Chinese utility model patent (publication number: CN219190284U) includes a cutter head assembly and a wrench assembly, wherein the cutter head assembly includes a base plate, a fixed blade holder, a fixed blade, a movable blade holder, a movable blade and a torsion spring, wherein the fixed blade holder is slidably arranged on the base plate; the wrench assembly includes a wrench and a spring, wherein the wrench is rotatably connected to the base plate through a pin shaft, a driving column is provided at an eccentric position of the inner end of the wrench, the fixed blade holder is provided with a slot plugged with the driving column, a fixed tooth block rotating synchronously with the wrench is provided in the wrench, an umbrella tooth portion meshing with the tooth surface of the fixed tooth block is provided on the wrench or the pin shaft, a spring is arranged between the inner end face of the wrench and the fixed tooth block so that the fixed tooth block has a tendency to move toward one side of the umbrella tooth portion, and the fixed tooth block in the wrench cooperates with the umbrella tooth portion to accurately position the wrench, thereby solving the problems of low positioning accuracy, large space occupation and high manufacturing and processing cost of the existing wrench adjustment mechanism.

[0004] However, the wrench adjustment mechanism of an electric clipper disclosed in the above-mentioned prior art has a high cost because its bevel tooth portion and the wrench or pin are integrated into a metal part, and the tooth surface of the bevel tooth portion needs to be stamped, resulting in low tooth surface accuracy of the bevel tooth portion, which affects the gear adjustment performance of the electric clipper.

[0005] Therefore, it is necessary to improve the existing technology. Utility Model Content

[0006] The purpose of the utility model is to solve the problem that in the prior art, the bevel tooth part and the wrench or the pin are integrated into a metal piece, which is not only costly, but also the tooth surface of the bevel tooth part needs to be stamped, resulting in low tooth surface accuracy of the bevel tooth part, which affects the performance of the gear adjustment of the electric clipper, and a wrench adjustment mechanism for the electric clipper is proposed.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] The cam is connected to the bottom plate by a spring, and the cam is connected to the bottom plate by a spring, and the cam is connected to the bottom plate by a spring.

[0009] Furthermore, a driving column is provided at an eccentric position of the inner end of the wrench, and the fixed knife frame is provided with a linkage hole corresponding to the driving column, and the driving column extends into the linkage hole to form an eccentric transmission connection between the wrench and the fixed knife frame.

[0010] Furthermore, the driving column and the wrench are an integrated structure.

[0011] Furthermore, a mounting hole is provided at an eccentric position of the inner end of the wrench, and the driving column is a metal insert provided in the mounting hole.

[0012] Furthermore, a gasket is sleeved on the outer end of the pin shaft, and the gasket is used to limit the wrench, the spring, the movable gear block and the fixed gear block from being separated from the pin shaft.

[0013] Furthermore, a fixed tooth positioning block is provided at the inner end of the fixed tooth block, and the bottom plate is provided with a fixed tooth positioning groove matched with the fixed tooth positioning block.

[0014] Furthermore, a movable tooth positioning block is provided at the inner end of the movable tooth block, and a movable tooth positioning groove matched with the movable tooth positioning block is provided on the inner wall of the wrench.

[0015] Furthermore, the outer wall of the movable tooth positioning block is provided with a protrusion, and the inner wall of the wrench is provided with a groove adapted to the protrusion.

[0016] Furthermore, the movable gear block and the fixed gear block are both made of plastic material.

[0017] Furthermore, the base plate is provided with an installation groove, a stop nut is fixedly installed in the installation groove, the outer wall of the inner end of the pin shaft is provided with a threaded portion, and the pin shaft is screwed to the stop nut through the threaded portion.

[0018] After adopting the above structure, the utility model has the following beneficial effects: the wrench adjustment mechanism of an electric hair clipper described in the utility model includes a cutter head assembly and a wrench assembly, the cutter head assembly includes a base plate and a fixed blade holder, the fixed blade holder is slidably connected to the base plate, the wrench assembly includes a wrench, a pin and a spring, the inner end of the pin is fixedly connected to the base plate, the wrench is movably sleeved on the outside of the pin, the wrench is transmission-connected to the fixed blade holder to drive the fixed blade holder to slide relative to the base plate, the wrench assembly also includes a moving tooth block and a fixed tooth block, the spring keeps the moving tooth block and the fixed tooth block always in meshing, and the moving tooth block and the fixed tooth block are both made of plastic material. When the wrench rotates, the fixed blade holder is driven to slide along the front-rear direction of the base plate through the driving column, thereby adjusting the relative distance between the fixed blade and the moving blade, thereby controlling the hair cutting length. When the wrench rotates, the movable tooth block is driven to rotate synchronously in the circumferential direction. At this time, the movable tooth block overcomes the elastic force provided by the spring in the axial direction to disengage from the meshing cooperation with the fixed tooth block. When the wrench rotates to a predetermined position, the movable tooth block resumes the meshing cooperation with the fixed tooth block under the elastic force of the spring. The wrench is precisely positioned by the cooperation between the movable tooth block and the fixed tooth block. The movable tooth block and the fixed tooth block are both made of plastic material, which makes the cost of the movable tooth block and the fixed tooth block lower, and the processing accuracy of the movable tooth bevel tooth part and the fixed tooth bevel tooth part can be higher, which solves the problem that the metal parts of the bevel tooth part and the wrench or the pin shaft are integrated in the prior art, which is not only costly, but also the tooth surface of the bevel tooth part needs to be stamped, resulting in low tooth surface accuracy of the bevel tooth part, which affects the performance of the gear adjustment of the electric hair clipper. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present utility model, the drawings required for use in the description of the specific implementation methods will be briefly introduced below. Obviously, the drawings in the following description are some implementation methods of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a sectional view of the overall structure of the utility model;

[0022] Figure 3 The utility model Figure 1 A magnified view of the structure at A;

[0023] Figure 4 It is an exploded view of the wrench assembly of the utility model;

[0024] Figure 5 It is a three-dimensional schematic diagram of the wrench of the utility model;

[0025] Figure 6It is a three-dimensional schematic diagram of the movable gear block and the fixed gear block of the utility model;

[0026] Figure 7 It is a three-dimensional schematic diagram of the bottom plate and the fixed knife holder of the utility model.

[0027] Figures 1 to 7 The bid number is:

[0028] 1. Cutter head assembly; 11. Bottom plate; 111. Fixed tooth positioning groove; 112. Mounting groove; 113. Stop nut; 12. Fixed knife holder; 121. Linkage hole; 13. Fixed blade; 14. Moving knife holder; 15. Moving blade; 2. Wrench assembly; 21. Wrench; 211. Driving column; 212. Moving tooth positioning groove; 213. Groove; 22. Pin; 221. Threaded portion; 23. Spring; 24. Moving tooth block; 241. Moving tooth positioning block; 242. Protrusion; 243. Moving tooth bevel gear portion; 25. Fixed tooth block; 251. Fixed tooth positioning block; 252. Fixed tooth bevel gear portion; 26. Gasket. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0030] In the description of the present invention, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly defined and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this utility model are only for illustrative purposes and do not represent the only implementation method.

[0035] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] like Figures 1 to 7As shown, a wrench adjustment mechanism of an electric hair clipper includes a cutter head assembly 1 and a wrench assembly 2, wherein the cutter head assembly 1 includes a base plate 11 and a fixed cutter holder 12, wherein the fixed cutter holder 12 is slidably connected to the base plate 11, and the wrench assembly 2 includes a wrench 21, a pin 22 and a spring 23, wherein the inner end of the pin 22 is fixedly connected to the base plate 11, and the wrench 21 is movably sleeved on the outside of the pin 22, wherein the wrench 21 is transmission-connected to the fixed cutter holder 12 for driving the fixed cutter holder 12 to slide relative to the base plate 11, and the wrench assembly 2 also includes a movable The tooth block 24 and the fixed tooth block 25 are movably sleeved on the outside of the pin shaft 22 in sequence along the axial direction from the outside to the inside. The movable tooth block 24 and the wrench 21 are movably connected in the axial direction and the two are transmission connected in the circumferential direction. The fixed tooth block 25 is movably connected to the wrench 21. The inner end of the fixed tooth block 25 passes through the wrench 21 and is fixedly connected to the bottom plate 11. The spring 23 is disposed between the outer end of the pin shaft 22 and the movable tooth block 24. The spring 23 keeps the movable tooth block 24 and the fixed tooth block 25 always in meshing.

[0037] Based on the above embodiments, the present utility model aims to solve the problem of providing a wrench adjustment mechanism of an electric hair clipper, comprising a cutter head assembly 1 and a wrench assembly 2, wherein the cutter head assembly 1 comprises a base plate 11 and a fixed cutter holder 12, wherein the fixed cutter holder 12 is slidably connected to the base plate 11, and the wrench assembly 2 comprises a wrench 21, a pin 22 and a spring 23, wherein the inner end of the pin 22 is fixedly connected to the base plate 11, and the wrench 21 is movably sleeved on the outside of the pin 22, wherein the wrench 21 is transmission-connected to the fixed cutter holder 12 for driving the fixed cutter holder 12 to slide relative to the base plate 11, and the wrench assembly 2 further comprises a movable tooth block 24 and a fixed tooth block 25, wherein the spring 23 keeps the movable tooth block 24 and the fixed tooth block 25 always in meshing relationship, and the movable tooth block 24 and the fixed tooth block 25 are both made of plastic. In this embodiment, the cutter head assembly 1 further comprises a fixed blade 13, a movable blade holder 14 and a movable blade 15, wherein the fixed blade 13 is connected to the fixed blade holder 12, and the movable blade 15 is arranged between the bottom plate 11 and the fixed blade 13. When the wrench 21 rotates, the fixed blade holder 12 is driven to slide forward and backward along the bottom plate 11 through the driving column 211, thereby adjusting the relative distance between the fixed blade 13 and the movable blade 15, thereby controlling the length of the haircut. When the wrench 21 rotates, the movable tooth block 24 is driven to rotate synchronously in the circumferential direction, at which time the movable tooth block 24 overcomes the elastic force provided by the spring 23 to disengage from the meshing cooperation with the fixed tooth block 25, and when the wrench 21 rotates to a predetermined position, the movable tooth block 24 resumes the meshing cooperation with the fixed tooth block 25 under the elastic force of the spring 23, and the wrench 21 is precisely positioned by the cooperation between the movable tooth block 24 and the fixed tooth block 25. In this embodiment, the movable tooth block 24 and the fixed tooth block 25 are both made of plastic material, so that the cost of the movable tooth block 24 and the fixed tooth block 25 is lower, and the processing accuracy of the movable tooth bevel gear portion 243 and the fixed tooth bevel gear portion 252 can be higher, which solves the problem that the bevel gear portion and the wrench 21 or the pin 22 in the prior art are integrated metal parts, which are not only costly, but also the tooth surface of the bevel gear portion needs to be stamped, resulting in low tooth surface accuracy of the bevel gear portion, which affects the performance of the gear adjustment of the electric hair clipper. In a further embodiment, as Figure 6 As shown, the inner end surface of the movable tooth block 24 is provided with a movable bevel gear portion 243 , and the outer end surface of the fixed tooth block 25 is provided with a fixed bevel gear portion 252 . The wrench 21 is precisely positioned by the meshing cooperation between the movable bevel gear portion 243 and the fixed bevel gear portion 252 .

[0038] As another preferred embodiment of the present invention, a driving column 211 is provided at an eccentric position on the inner end of the wrench 21, and a linkage hole 121 corresponding to the driving column 211 is provided on the fixed tool holder 12. The driving column 211 extends into the linkage hole 121 so that the wrench 21 and the fixed tool holder 12 form an eccentric transmission connection. The driving column 211 and the wrench 21 are an integrated structure. A mounting hole is provided at an eccentric position on the inner end of the wrench 21, and the driving column 211 is a metal insert provided in the mounting hole. In this embodiment, Figure 2, Figure 4 As shown, when installing the spanner 21, the threaded portion 221 of the pin 22 is passed through the spanner 21 and then through the through hole on the bottom plate 11, and then screwed with the stop nut 113, and the driving column 211 is extended into the linkage hole 121. When the spanner 21 is rotated, the fixed blade holder 12 can be pushed to slide along the front-to-back direction of the bottom plate 11, so that the fixed blade 13 can move forward and backward relative to the movable blade 15, thereby changing the spacing between the teeth of the movable blade 15 and the teeth of the fixed blade 13, so as to achieve the effect of controlling the length of the haircut. The specific working principle of the sliding connection between the fixed blade holder 12 and the bottom plate 11 is the prior art and will not be repeated here. In a further embodiment, the driving column 211 and the spanner 21 are an integrated structure. In this embodiment, the driving column 211 and the spanner 21 are both made of plastic material, and the driving column 211 and the spanner 21 are integrally formed by injection molding, so that the design is easy to process. In a further embodiment, a mounting hole is provided at an eccentric position of the inner end of the wrench 21, and the driving column 211 is a metal insert provided in the mounting hole. In this embodiment, the wrench 21 is made of plastic, the driving column 211 is a metal insert, the driving column 211 is interference fit with the mounting hole, and the driving column 211 made of metal can increase the service life of the driving column 211 because the metal material is more wear-resistant.

[0039] As another preferred embodiment of the present invention, the inner end of the fixed tooth block 25 is provided with a fixed tooth positioning block 251, and the bottom plate 11 is provided with a fixed tooth positioning groove 111 adapted to the fixed tooth positioning block 251. Figure 3 , Figure 7 As shown, the fixed tooth block 25 is fixedly connected to the bottom plate 11 by the fixed tooth positioning block 251 and the fixed tooth positioning groove 111 of the bottom plate 11, so that the fixed tooth block 25 will not rotate with the rotation of the wrench 21. In a further embodiment, the fixed tooth positioning block 251 is a square block, and the fixed tooth positioning groove 111 is a square groove. The cooperation between the square block and the square groove makes the positioning of the fixed tooth positioning block 251 relative to the bottom plate 11 more reliable.

[0040] As another preferred embodiment of the present invention, the inner end of the movable tooth block 24 is provided with a movable tooth positioning block 241, and the inner wall of the wrench 21 is provided with a movable tooth positioning groove 212 adapted to the movable tooth positioning block 241. The outer wall of the movable tooth positioning block 241 is provided with a protrusion 242, and the inner wall of the wrench 21 is provided with a groove 213 adapted to the protrusion 242. In this embodiment, Figure 5 , Figure 6As shown, the synchronous rotation of the movable tooth block 24 and the wrench 21 is achieved by the positioning cooperation between the movable tooth positioning block 241 and the movable tooth positioning groove 212 of the wrench 21. In a further embodiment, the movable tooth positioning block 241 is a polygonal block, and the movable tooth positioning groove 212 is a polygonal groove adapted to the movable tooth positioning block 241. The cooperation between the polygonal block and the polygonal groove makes the positioning of the movable tooth positioning block 241 relative to the wrench 21 more reliable. In a further embodiment, the outer wall of the movable tooth positioning block 241 is provided with a protrusion 242, and the inner wall of the wrench 21 is provided with a groove 213 adapted to the protrusion 242. The cooperation between the protrusion 242 and the groove 213 makes the circumferential positioning of the movable tooth positioning block 241 relative to the wrench 21 more reliable, further improving the reliability of the synchronous rotation of the movable tooth positioning block 241 with the wrench 21 in the circumferential direction.

[0041] As another preferred embodiment of the present invention, a washer 26 is sleeved on the outer end of the pin shaft 22, and the washer 26 is used to limit the wrench 21, the spring 23, the movable tooth block 24 and the fixed tooth block 25 from being separated from the pin shaft 22. The outer wall of the movable tooth positioning block 241 is provided with a protrusion 242, and the inner wall of the wrench 21 is provided with a groove 213 adapted to the protrusion 242. In this embodiment, as Figure 3 , Figure 4 As shown, the washer 26 plays a role of limiting, preventing the wrench 21, the spring 23, the movable tooth block 24 and the fixed tooth block 25 from being separated from the pin 22. Of course, as an equivalent alternative means, a nut portion with a larger diameter can also be provided on the outer side of the pin 22, and the wrench 21, the spring 23, the movable tooth block 24 and the fixed tooth block 25 can be limited by the nut portion to be separated from the pin 22. In a further embodiment, the outer end of the wrench 21 is provided with a receiving groove, and the washer 26, the wrench 21, the spring 23, the movable tooth block 24 and the fixed tooth block 25 are all installed in the receiving groove. The washer 26 is installed at the outermost end and cooperates with the pin 22 to limit the spring 23, the movable tooth block 24 and the fixed tooth block 25. This design makes the wrench assembly 2 more beautiful as a whole after installation, and also makes the overall volume of the wrench assembly 2 smaller, reducing the space occupied.

[0042] As another preferred embodiment of the present invention, the movable tooth block 24 and the fixed tooth block 25 are both made of plastic. In this embodiment, the movable tooth block 24 and the fixed tooth block 25 are both made of plastic, so that the cost of the movable tooth block 24 and the fixed tooth block 25 is lower, and the machining accuracy of the movable bevel gear portion 243 and the fixed bevel gear portion 252 can be higher, and the performance of the gear adjustment of the electric hair clipper is further guaranteed.

[0043] As another preferred embodiment of the present invention, the bottom plate 11 is provided with a mounting groove 112, a stop nut 113 is fixedly installed in the mounting groove 112, the outer wall of the inner end of the pin shaft 22 is provided with a threaded portion 221, and the pin shaft 22 is screwed to the stop nut 113 through the threaded portion 221. Figure 3 , Figure 4 and Figure 7 As shown, in this embodiment, a threaded hole threadedly connected to the threaded portion 221 is provided in the stop nut 113, and a through hole is provided on the bottom plate 11 for the threaded portion 221 to extend into the threaded hole. Since it is inconvenient to position and clamp the bottom plate 11 before processing, the threaded hole is conveniently processed by providing the threaded hole on the stop nut 113. In a further embodiment, the mounting groove 112 is a square groove, and the stop nut 113 is a square block structure corresponding to the square groove. This structural design limits the rotation of the stop nut 113 relative to the mounting groove 112. The reliability of the fixed installation of the pin 22 relative to the bottom plate 11 is ensured.

[0044] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present utility model.

Claims

1. A wrench adjustment mechanism for an electric hair clipper, comprising a cutter head assembly (1) and a wrench assembly (2), wherein the cutter head assembly (1) comprises a base plate (11) and a fixed cutter holder (12), wherein the fixed cutter holder (12) is slidably connected to the base plate (11), and the wrench assembly (2) comprises a wrench (21), a pin (22) and a spring (23), wherein the inner end of the pin (22) is fixedly connected to the base plate (11), the wrench (21) is movably sleeved on the outside of the pin (22), and the wrench (21) is transmission-connected to the fixed cutter holder (12) for driving the fixed cutter holder (12) to slide relative to the base plate (11), characterized in that: The wrench assembly (2) further comprises a movable tooth block (24) and a fixed tooth block (25), wherein the movable tooth block (24) and the fixed tooth block (25) are movably sleeved on the outside of the pin shaft (22) in sequence from the outside to the inside along the axial direction, the movable tooth block (24) and the wrench (21) are movably connected in the axial direction and the two are transmission connected in the circumferential direction, the fixed tooth block (25) is movably connected to the wrench (21), the inner end of the fixed tooth block (25) passes through the wrench (21) and is fixedly connected to the base plate (11), and the spring (23) is disposed between the outer end of the pin shaft (22) and the movable tooth block (24), and the spring (23) keeps the movable tooth block (24) and the fixed tooth block (25) always in meshing relationship.

2. The wrench adjustment mechanism of an electric hair clipper according to claim 1, characterized in that: A driving column (211) is provided at an eccentric position on the inner end of the wrench (21), and the fixed knife holder (12) is provided with a linkage hole (121) corresponding to the driving column (211). The driving column (211) extends into the linkage hole (121) so that the wrench (21) and the fixed knife holder (12) form an eccentric transmission connection.

3. The wrench adjustment mechanism of an electric hair clipper according to claim 2, characterized in that: The driving column (211) and the wrench (21) are an integrated structure.

4. The wrench adjustment mechanism of an electric hair clipper according to claim 2, characterized in that: A mounting hole is provided at an eccentric position of the inner end of the wrench (21), and the driving column (211) is a metal insert provided in the mounting hole.

5. The wrench adjustment mechanism of an electric hair clipper according to claim 1, characterized in that: The outer end of the pin shaft (22) is sleeved with a gasket (26), and the gasket (26) is used to limit the wrench (21), the spring (23), the movable tooth block (24) and the fixed tooth block (25) from being separated from the pin shaft (22).

6. The wrench adjustment mechanism of an electric hair clipper according to claim 1, characterized in that: The inner end of the fixed tooth block (25) is provided with a fixed tooth positioning block (251), and the bottom plate (11) is provided with a fixed tooth positioning groove (111) adapted to the fixed tooth positioning block (251).

7. The wrench adjustment mechanism of an electric hair clipper according to claim 1, characterized in that: A movable tooth positioning block (241) is provided at the inner end of the movable tooth block (24), and a movable tooth positioning groove (212) adapted to the movable tooth positioning block (241) is provided on the inner wall of the wrench (21).

8. The wrench adjustment mechanism of an electric hair clipper according to claim 7, characterized in that: The outer wall of the movable tooth positioning block (241) is provided with a protrusion (242), and the inner wall of the wrench (21) is provided with a groove (213) adapted to the protrusion (242).

9. The wrench adjustment mechanism of an electric hair clipper according to claim 1, characterized in that: The movable gear block (24) and the fixed gear block (25) are both made of plastic material.

10. The wrench adjustment mechanism of an electric hair clipper according to claim 1, characterized in that: The bottom plate (11) is provided with a mounting groove (112), a stop nut (113) is fixedly installed in the mounting groove (112), an outer wall of the inner end of the pin shaft (22) is provided with a threaded portion (221), and the pin shaft (22) is threadedly connected to the stop nut (113) via the threaded portion (221).

Images