Hair trimming device and linear vibration electric motor therefor

Abstract

A hair trimming device and a linear vibration electric motor therefor. The linear vibration electric motor comprises: a mounting bracket, a stator for outputting alternating magnetic fields, a first swing member, two rotors, a rotor retainer and a second swing member, wherein the stator is arranged at the lower portion of the mounting bracket; the rotor retainer is movably connected to the mounting bracket; the rotors are arranged at the bottom of the rotor retainer, the rotors being located above the stator, and the magnetic poles of the two rotors being opposite; and the first swing member and the second swing member are both connected to the rotor retainer, and a spring is provided between the first swing member and the second swing member. The present hair trimming device uses the stator to output alternating magnetic fields, such that the rotors are subjected to a linear reciprocating acting force, so as to perform a linear reciprocating motion via the traction or support of the rotor retainer, enabling the electric motor to directly output a driving force for linear reciprocating motion; the hair trimming device further uses the spring to provide a restoring elastic force for the first swing member and the second swing member and to cause resonance, thereby producing a larger swing amplitude.

Description

A hair trimming device and its linear vibration motor Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a hair trimming device and a linear vibration motor thereof. Background Art

[0002] Currently, when using a hair clipper or razor, the blade for cutting hair needs to reciprocate at a high frequency, and this process requires the help of a motor and a transmission structure. Regarding the above description, the commonly used transmission structure is usually a motor driving an eccentric wheel to rotate at high speed. The eccentric wheel is connected to the end of the blade holder. The eccentric wheel converts the rotational motion of the motor into linear motion, thereby driving the blade to reciprocate at a high frequency. However, the disadvantages of this method are:

[0003] 1. The eccentric wheel and the cutter holder need to be connected in rotation to achieve the above transmission process. During the rotation, there is friction between the two. In the high-frequency rotation scenario, the rotation connection point between the eccentric wheel and the cutter holder wears faster, requiring frequent replacement and increasing costs.

[0004] 2. The eccentric wheel drive structure requires a larger housing cavity inside the housing of shaving devices such as hair clippers and shavers, which means that the end of the hair clipper adjacent to the cutter head must be designed to be relatively thick, increasing the size of the hair clipper itself, which does not meet the current development requirements of miniaturization of electronic products.

[0005] For example, the application number is CN201710061467.0, and the name is: Chinese invention patent for electric shaving device, which converts the rotational motion of the output shaft of the motor into reciprocating linear motion to drive the movable blade to perform reciprocating linear motion, thereby achieving the purpose of shaving hair. However, when the rotational motion is converted into reciprocating linear motion, energy loss is caused in the transmission process, and the product reliability may also be reduced due to mechanical wear. In addition, its structure is relatively complex, which is not conducive to assembly.

[0006] Therefore existing technology still needs to be improved and improved. Utility Model Content

[0007] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a hair trimming device and a linear vibration motor thereof, which can directly output a driving force for linear reciprocating motion, thereby simplifying the structure and improving efficiency.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] A linear vibration motor for a hair trimming device includes a mounting frame, a stator for outputting an alternating magnetic field, a first swinging member, two movers, a mover holder, and a second swinging member. The stator is arranged at the bottom of the mounting frame, the mover holder is movably connected to the mounting frame, the mover is arranged at the bottom of the mover holder, the mover is located above the stator, and the magnetic poles of the two movers are arranged in opposite directions. The first and second swinging members are connected to the mover holder, and a spring is arranged between the first and second swinging members.

[0010] In the linear vibration motor of the hair trimming device, the stator includes an iron core and a winding, the winding includes a bobbin and an enameled wire, the enameled wire is wound on the bobbin, the iron core has two teeth, and the winding is sleeved on the teeth of the iron core.

[0011] In the linear vibration motor of the hair trimming device, the mover includes a first mover and a second mover, each of the first mover and the second mover includes a magnet and a yoke, and the yoke and the magnet are stacked.

[0012] In the linear vibration motor of the hair trimming device, the mover holder includes an integrally arranged first mover connecting portion, a second mover connecting portion, a fixing portion and a flexible retaining portion, the fixing portion is connected to the mounting frame, and the first mover connecting portion and the second mover connecting portion are connected to the first mover and the second mover, respectively.

[0013] In the linear vibration motor of the hair trimming device, the flexible retaining portion is a thin-walled vertical plate.

[0014] In the linear vibration motor of the hair trimming device, the first swinging member is connected to the first mover connecting portion; and the second swinging member is connected to the second mover connecting portion.

[0015] In the linear vibration motor of the hair trimming device, a rocker arm is extended from the middle of the first rocking member, and lugs are provided on both sides of the second rocking member. The rocker arm is located between the two lugs. The rocker arm and the lug are both provided with spring connecting parts. The two ends of the spring are respectively connected to the spring connecting parts, and the two springs are symmetrically arranged.

[0016] In the linear vibration motor of the hair trimming device, the magnetic poles of the magnets of the first and second movers are arranged opposite to each other.

[0017] In the linear vibration motor of the hair trimming device, the iron core is U-shaped, and there are two windings, each of which is sleeved on a tooth portion.

[0018] A hair trimming device comprises a housing, a control component, a movable blade and a linear vibration motor as described above, wherein the control component and the linear vibration motor are both arranged in the housing, and the movable blade is connected to the first swinging member and / or the second swinging member of the linear vibration motor.

[0019] Compared with the prior art, the hair trimming device and its linear vibration motor provided by the present invention, wherein, after the linear vibration motor is energized, the stator outputs an alternating magnetic field, so that the mover is subjected to a linear reciprocating force under the action of the alternating magnetic field, and at the same time, is pulled or supported by the mover holder, thereby generating linear reciprocating motion. Since the first swinging member and the second swinging member are both connected to the mover holder, the first swinging member and the second swinging member can both serve as motor power output ends, so that the motor can directly output the driving force for linear reciprocating motion, eliminating the mechanism of converting rotational motion into linear motion in the prior art, thereby simplifying the structure, improving efficiency, and improving the reliability of the system.

[0020] Furthermore, the present invention can provide restoring elastic force and generate resonance for the first swing member and the second swing member through the spring, thereby generating a larger swing amplitude. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic structural diagram of a linear vibration motor of a hair trimming device provided by the present invention at one angle.

[0022] FIG2 is a schematic structural diagram of the linear vibration motor of the hair trimming device provided by the present invention from another angle.

[0023] FIG3 is a schematic diagram of the exploded structure of the linear vibration motor of the hair trimming device provided by the present invention.

[0024] Description of the accompanying drawings:

[0025] Mounting frame 1, stator 2, iron core 21, tooth portion 212, winding 22, bobbin 221, enameled wire 222, first swinging member 3, swing rod 31, mover 4, first mover 41, magnet 411, yoke 412, extension portion 4121, second mover 42, mover holder 5, first mover connecting portion 51, second mover connecting portion 52, fixing portion 53, flexible retaining portion 54, second swinging member 6, lug 61, spring 7 Best Mode for Carrying Out the Invention

[0026] The present invention provides a linear vibration motor for a hair trimming device, comprising a mounting frame, a stator for outputting an alternating magnetic field, a first swinging member, two movers, a mover holder, and a second swinging member. The stator is disposed at the bottom of the mounting frame, the mover holder is movably connected to the mounting frame, the mover is disposed at the bottom of the mover holder, the mover is located above the stator, and the magnetic poles of the two movers are arranged in opposite directions. The first swinging member and the second swinging member are connected to the mover holder, and a spring is disposed between the first and second swinging members. When the hair trimming device is turned on, the stator outputs an alternating magnetic field, causing the mover to be subjected to a linear reciprocating force under the action of the alternating magnetic field. Simultaneously, the mover is pulled or supported by the mover holder, thereby generating linear reciprocating motion. Since both the first swinging member and the second swinging member are connected to the mover holder, the first swinging member and the second swinging member can serve as motor power output terminals, allowing the motor to directly output the driving force for the linear reciprocating motion, eliminating the mechanism for converting rotational motion into linear motion in the prior art, thereby simplifying the structure, improving efficiency, and enhancing system reliability. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] It should be noted that when a component is referred to as being “mounted on,” “fixed on,” or “disposed on” another component, it may be directly on the other component or there may be an intermediate component. When a component is referred to as being “connected to” another component, it may be directly connected to the other component or there may be an intermediate component.

[0029] It should also be noted that the directional terms such as left, right, up, and down in the embodiments of the present invention are merely relative concepts or are based on the normal use status of the product, and should not be considered as restrictive.

[0030] Referring to Figures 1, 2, and 3, the linear vibration motor for a hair trimming device provided by the present invention includes a mounting frame 1, a stator 2 for outputting an alternating magnetic field, a first oscillating member 3, two movers 4, a mover holder 5, and a second oscillating member 6. The stator 2 is disposed in the middle or lower portion of the mounting frame 1, the mover holder 5 is movably connected to the mounting frame 1, and the movers 4 are disposed at the bottom of the mover holder 5. The movers 4 are located above the stator 2, and the magnetic poles of the two movers 4 are arranged in opposite directions. The first oscillating member 3 and the second oscillating member 6 are connected to the mover holder 5, and a spring 7 is disposed between the first oscillating member 3 and the second oscillating member 6. When the hair trimming device is turned on, the stator 2 outputs an alternating magnetic field, causing the mover 4 to be subjected to a linear reciprocating force under the action of the alternating magnetic field. Simultaneously, the mover 4 is pulled or supported by the mover holder 5, thereby generating linear reciprocating motion. Since the first oscillating member 3 and the second oscillating member 6 are both connected to the mover holder 5, the first oscillating member 3 and the second oscillating member 6 can both serve as motor power output terminals.

[0031] Furthermore, the spring 7 can provide a restoring force and resonance for the first and second swinging members 3 and 6, thereby generating a larger swing amplitude. The motor in this embodiment can directly output the driving force for linear reciprocating motion, eliminating the mechanism used in the prior art to convert rotational motion into linear motion. This simplifies the structure of the hair trimming device, improves efficiency, and enhances product reliability.

[0032] In this embodiment, the magnetic poles of the two movers 4 are arranged in opposite directions so that the electromagnetic forces are always in opposite directions and the directions of movement are also always opposite. The purpose is to offset the inertial forces of the two movers 4 and the reaction forces of the stator 2 and the mover 4, thereby reducing the vibration noise of the entire motor.

[0033] Continuing with Figures 1 to 3 , the stator 2 includes an iron core 21 and windings 22. The windings 22 include a bobbin 221 and enameled wire 222. The enameled wire 222 is wound around the bobbin 221. The iron core 21 has two teeth 212, and the windings 22 are sleeved around the teeth 212 of the iron core 21. Specifically, the iron core 21 is U-shaped, and there are two windings 22, each sleeved around a tooth 212. This maximizes the space within the hair trimming device to accommodate more enameled wire 222, thereby increasing motor output.

[0034] The mover 4 comprises a first mover 41 and a second mover 42, each of which includes a magnet 411 and a yoke 412. The yoke 412 is stacked with the magnet 411. Specifically, one side of the magnet 411 is tightly affixed to the yoke 412, while its opposite side faces the teeth 212 of the core 21. Under the influence of the alternating magnetic field of the stator 2, the first mover 41 and the second mover 42 are subjected to a linear reciprocating force (perpendicular to the axis of the stator 2's teeth 212), thereby generating linear reciprocating motion along the axis of the teeth 212. Furthermore, the bottom of the yoke 412 has an extension 4121 that positions the magnet 411, preventing displacement of the magnet 411 during use.

[0035] In this embodiment, the magnetic poles of the magnets 411 of the first mover 41 and the second mover 42 are arranged relative to each other, so that the electromagnetic forces acting on the first mover 41 and the second mover 42 are always in opposite directions, and the directions of movement are also always opposite. The purpose is to make the inertial forces of the first mover 41 and the second mover 42 cancel each other out, and also to make the reaction forces on the iron core 21 from the first mover 41 and the second mover 42 cancel each other out, thereby reducing the vibration noise of the entire motor during operation.

[0036] As shown in Figure 3, the mover retaining member 5 includes an integrally arranged first mover connecting portion 51, a second mover connecting portion 52, a fixing portion 53 and a flexible retaining portion 54. The fixing portion 53 is connected to the mounting frame 1, and the first mover connecting portion 51 and the second mover connecting portion 52 are respectively connected to the first mover 41 and the second mover 42. The first mover connecting portion 51 and the second mover connecting portion 52 are spaced apart so that a certain distance is separated between the two movers to maintain the freedom of movement between the movers.

[0037] Among them, the flexible retaining portion 54 is a thin-walled vertical plate, which has sufficient rigidity along the vertical plate (vertical) direction and flexibility perpendicular to the vertical plate direction, so that the mover retaining member 5 can pull or support the mover 4, maintain the stability of the air gap between the magnet 411 and the tooth portion 212 of the iron core 21, and provide the mover 4 with freedom of movement in the direction (perpendicular to the axis of the tooth portion 212 of the stator 2) to achieve its linear reciprocating motion.

[0038] Furthermore, the features of the flexible retaining portion 54 are utilized to eliminate friction between the mover 4 and other supporting members during movement, reducing energy loss. In this embodiment, the flexible retaining portion 54 is in a tensioned state, which provides greater stability than a compressed state and eliminates the risk of buckling of the flexible retaining portion 54 (vertical plate). Therefore, the wall thickness of the flexible retaining portion 54 can be further reduced based on actual usage requirements to reduce bending stress on the vertical plate and allow for a greater swing amplitude for the first and second movers 41, 42.

[0039] The first swinging member 3 is connected to the connecting part of the first mover 41; the second swinging member 6 is connected to the connecting part of the second mover 42, so that the linear reciprocating motion of the first mover 41 and the second mover 42 respectively drives the first swinging member 3 and the second swinging member 6 to perform linear reciprocating motion, so that the first swinging member 3 and the second swinging member 6 can be used together as the power output end of the motor, respectively connected to two different loads (such as two cutter heads) to realize the drive of the load, or the first swinging member 3 can be used as the power output end of the motor, connected to one load (that is, a blade can be installed on the rocker 31), and the second swinging member 6 only serves as a counterweight.

[0040] A rocker arm 31 is extended from the middle of the first rocker member 3, and lugs 61 are provided on both sides of the second rocker member 6. The rocker arm 31 is located between the two lugs 61. The rocker arm 31 and the lug 61 are both provided with a spring 7 connecting part. The two ends of the spring 7 are respectively connected to the spring 7 connecting part, and the two springs 7 are symmetrically arranged. The spring 7 provides restoring elastic force for the first rocker member 3 and the second rocker member 6. By designing the elastic coefficient of the spring 7, the first rocker member 3 and the second rocker member 6 can resonate at their operating frequency, thereby generating a larger swing amplitude.

[0041] In this embodiment, two springs 7 are symmetrically arranged between the first swing member 3 and the second swing member 6 to achieve a greater elastic effect. Of course, the number of springs 7 is not limited to two, and the number of springs 7 can be increased according to the actual structure and use needs, which is not limited here.

[0042] Based on the aforementioned linear vibration motor, the present invention also provides a corresponding hair trimming device (not shown), which includes a housing, a control assembly, a movable blade, and a linear vibration motor. The control assembly and linear vibration motor are both disposed within the housing. The movable blade is connected to the first oscillating member 3 and / or the second oscillating member 6 of the linear vibration motor. The movable blade performs a hair trimming function through the linear reciprocating motion of the first oscillating member 3 and / or the second oscillating member 6. Since the linear vibration motor has been described in detail above, it will not be repeated here. Industrial Applicability

[0043] To sum up, the hair trimming device and its linear vibration motor provided by the present invention, wherein, after the linear vibration motor is energized, the stator outputs an alternating magnetic field, so that the mover is subjected to a linear reciprocating force under the action of the alternating magnetic field, and at the same time, through the traction or support of the mover retaining member, a linear reciprocating motion is generated. Since the first swinging member and the second swinging member are both connected to the mover retaining member, the first swinging member and the second swinging member can both serve as the power output end of the motor.

[0044] Furthermore, the spring provides restorative force and resonance for the first and second swinging members, resulting in a larger swing amplitude. Furthermore, the magnetic poles of the two movers are arranged in opposite directions, ensuring that the electromagnetic forces are always in opposite directions and the directions of motion are always opposite. This is intended to offset the inertial forces of the two movers and the reaction forces of the two stator movers, thereby reducing the vibration and noise of the entire motor. The motor in this embodiment can directly output the driving force for linear reciprocating motion, eliminating the mechanism used in the prior art to convert rotational motion into linear motion. This simplifies the structure, improves efficiency, and enhances system reliability.

[0045] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and utility model concept of the present invention, and all these changes or substitutions should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A linear vibration motor for a hair trimming device, characterized in that: It includes a mounting frame, a stator for outputting an alternating magnetic field, a first swinging member, two movers, a mover retaining member and a second swinging member, wherein the mover retaining member is movably connected to the mounting frame, the mover is arranged at the bottom of the mover retaining member, the mover is located above the stator, and the magnetic poles of the two movers are arranged oppositely, the first swinging member and the second swinging member are connected to the mover retaining member, and a spring is arranged between the first swinging member and the second swinging member.

2. The linear vibration motor of a hair trimming device according to claim 1, characterized in that: The stator comprises an iron core and a winding, wherein the winding comprises a wire frame and an enameled wire, wherein the enameled wire is wound on the wire frame, the iron core has two teeth, and the winding is sleeved on the teeth of the iron core.

3. The linear vibration motor of the hair trimming device according to claim 1, characterized in that: The mover comprises a first mover and a second mover, wherein the first mover and the second mover both comprise a magnet and a yoke, and the yoke is overlapped with the magnet.

4. The linear vibration motor of a hair trimming device according to claim 1, characterized in that: The mover holder includes a first mover connecting portion, a second mover connecting portion, a fixing portion and a flexible retaining portion which are integrally arranged. The fixing portion is connected to the mounting frame, and the first mover connecting portion and the second mover connecting portion are connected to the first mover and the second mover respectively.

5. The linear vibration motor of a hair trimming device according to claim 4, characterized in that: The flexible retaining portion is a thin-walled vertical plate.

6. The linear vibration motor of a hair trimming device according to claim 4, characterized in that: The first swinging member is connected to the first mover connecting portion; the second swinging member is connected to the second mover connecting portion.

7. The linear vibration motor of a hair trimming device according to claim 1, characterized in that: A swing rod is extended from the middle of the first swing member, lugs are provided on both sides of the second swing member, the swing rod is located between the two lugs, the swing rod and the lug are both provided with spring connecting parts, the two ends of the spring are respectively connected to the spring connecting parts, and the two springs are symmetrically arranged.

8. The linear vibration motor of a hair trimming device according to claim 3, characterized in that: The magnetic poles of the magnets of the first and second movers are arranged opposite to each other.

9. The linear vibration motor of a hair trimming device according to claim 2, characterized in that: The iron core is U-shaped, and there are two windings, each of which is sleeved on a tooth portion.

10. A hair trimming device, characterized in that: It comprises a shell, a control component, a movable blade and a linear vibration motor as described in any one of claims 1 to 9, wherein the control component and the linear vibration motor are both arranged in the shell, and the movable blade is connected to a first swinging member and / or a second swinging member of the linear vibration motor.

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