CN115056269A

CN115056269A - Hair shaver

Info

Publication number: CN115056269A
Application number: CN202210773277.2A
Authority: CN
Inventors: 祝永锋; 叶志文; 杨长波
Original assignee: Huanxing Technology Hangzhou Co ltd
Current assignee: Huanxing Technology Hangzhou Co ltd
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2022-09-16

Abstract

The present invention provides a shaver comprising: the shaver comprises a handle and a shaver head detachably connected with the handle, wherein a magnetic material or a second magnet and a base matched with the shaver are arranged at the lower part of the handle, a first magnet or a magnetic material is arranged in the base, when the shaver is placed on the base, the handle and the base form magnetic attraction, the magnetic attraction and the gravity of the shaver form balance, and the shaver is suspended above the base. According to the hair shaver, the magnetic material or the second magnet is arranged, and then the first magnet or the magnetic material is arranged on the base, so that the magnetic attraction can be formed between the magnetic material and the second magnet, and the hair shaver is suspended when the magnetic attraction and the gravity are balanced, and the hair shaver is ensured to be installed.

Description

Hair shaver

Technical Field

The invention relates to the technical field of shavers in daily supplies, in particular to a shaver.

Background

The existing shaver is connected in a plug-in mode, so that bacteria are bred between a handle and a base easily through water stains and the like to cause sanitation problems, meanwhile, the required structures are complex in plug-in mode and the like, large external force is required during installation and disassembly, and meanwhile, once the external force direction is not correct, the connection relation is easy to damage.

Disclosure of Invention

The invention aims to provide a shaver, which enables a handle to be attracted above a base through formed magnetic attraction force, has certain suspension force with the base and is suspended above the base instead of being directly attached.

The technical scheme for realizing the purpose of the invention is as follows:

a hair shaver comprising: the shaver comprises a handle and a shaver head detachably connected with the handle, wherein a magnetic material or a second magnet and a base matched with the shaver are arranged at the lower part of the handle, a first magnet or a magnetic material is arranged in the base, when the shaver is placed on the base, the handle and the base form magnetic attraction, the magnetic attraction and the gravity of the shaver form balance, and the shaver is suspended above the base.

In this technical scheme, set up magnetic material or second magnet, then set up first magnet or magnetic material at the base for both can form magnetic attraction, and then when magnetic attraction and gravity are balanced, have realized shaving hair ware's suspension, have ensured the installation.

In this technical scheme, compare in other assembly methods, the magnetic suspension possesses the gap of assembly and space simultaneously for the assembly of shaver has certain science and technology to feel, and the gap then can avoid the bacterium that water droplet etc. caused.

In this technical scheme, set up magnetic material or second magnet in the lower part of handle, its purpose is for making the handle lower part inhale as magnetism, and is nearer apart from the base, and easy magnetism is inhaled and is realized suspending, and on the other hand has increased weight on the base in other words for center on the handle has set up partly down, has realized the stable balance at center.

As a further development of the invention, the centre of gravity of the shaver is located in a lower region of the handle, said centre of gravity being located in a region where the magnetic material or the second magnet is located.

In the technical scheme, the center of the shaver is arranged in the lower area of the handle, gravity faces downwards, the problem of heavy head and light feet is not easy to generate, the problem of toppling and the like is avoided, and the handle is ensured to be always in a suspension state instead of toppling.

As a further improvement of the invention, the shaver is a manual shaver, the handle adopts a structure with a large middle part and two small ends, the upper part of the handle is also provided with a fifth magnet, the fifth magnet is magnetically connected with the cutter head, the lower part of the handle adopts an arc structure, and the second magnet is embedded in the arc structure.

Among this technical scheme, the big both ends of middle part are little structure, make whole center at the middle part, then increase the fifth magnet in upper portion, make handle and tool bit magnetism inhale the connection, and set up the circular arc structure in the lower part, and then the second magnet is embedded in circular arc structure department, compare in other structures, the circular arc structure has certain radian, the state of suspending this moment, if there is certain slope, also be the circular arc slope, can not fish tail base or other structures when suspending or slope, improve safety and life.

As a further improvement of the invention, the center of gravity of the cutter head and the center of gravity of the handle are on the same axis.

Among this technical scheme, the focus when tool bit and handle is at same axis, when both centrobaries are coaxial promptly, then tool bit and handle suspend simultaneously, if the handle vertical suspension is in the base top this moment, then drive the tool bit also vertical suspension on the base for tool bit and handle are suspended the assembly on the base simultaneously.

As a further improvement of the present invention, a fourth magnet is disposed in a middle region of the handle, a third magnet is embedded in the base, when the shaver is perpendicular to the base, the third magnet and the fourth magnet do not generate magnetic attraction, and when the shaver is in an inclined state, the third magnet and the fourth magnet generate magnetic attraction.

Among this technical scheme, set up the fourth magnet in the middle part of the handle, it can make the focus be in the middle part always, and its and the fourth magnet on the base, when perpendicular, the distance is far away, and then difficult production magnetic attraction, and if the slope sets up, then the fourth magnet is close to the third magnet, and then produces magnetic attraction for handle and tool bit are in the state that nevertheless can not empty with the base slope, have realized the assembly mode of tilting.

As a further improvement of the present invention, the first magnet is set to generate a magnetic attraction force F, and a gravity force G in a vertical state of the shaver satisfies F/G ═ (Cos θ -Sin θ) +1 when the shaver is inclined at an angle θ to the horizontal direction of the base so that the shaver does not come off the base.

In this technical scheme, through the relation of gravity and magnetic attraction, guaranteed to shave the hair ware under the effect of magnetic attraction, guaranteed the suspension all the time on the base, and then make the handle top still set up the shaving ware of tool bit, can suspend the installation under the effect of magnetic attraction.

As a further improvement of the present invention, the adjustment of the center of gravity of the shaver is performed by adjusting the length of the fourth magnet.

In this embodiment, in order to ensure the center of gravity of the hair shaver, the handle is particularly required to be arranged downward, so that the handle is assembled on the base, and therefore, when the weight of the hair shaver or the like changes, the length of the fourth magnet is adjusted correspondingly, so that the total weight is increased, and the center of gravity is adjusted.

As a further development of the invention, the fourth magnet is lengthened in the same position, corresponding to a corresponding increase in the center of gravity of the shaver.

In particular, the fourth magnet is lengthened by 5mm, and the center of gravity of the shaver is correspondingly raised by 0.2 mm. When the length of the fourth magnet is increased, the whole weight is increased, and the gravity center is also raised.

As a further improvement of the invention, the distance between the bottom surface of the fourth magnet and the top end surface of the third magnet is 10-60 mm.

In the technical scheme, the distance between the fourth magnet group and the third magnet group is not suitable for being too close, a magnetic field is easily generated when the distance is too close, the gravity center is shifted when the distance is too far, the suspension is influenced, and further, the generated magnetic field strength is different in the corresponding height.

As a further improvement of the invention, the magnetic force of the fourth magnet is 800-.

In the technical scheme, the third magnet has the largest magnetic force, surrounds the base, generates a stronger magnetic field, interacts with the magnetic field of the fourth magnet with the lowest magnetic field, and judges whether magnetic attraction is required to be generated according to requirements; the magnetic field strength of the first magnet and the second magnet is centered, and the purpose of the magnetic field strength is to ensure suspension and to ensure the realization of the whole suspension assembly.

Drawings

FIG. 1 is an assembly view of a shaver according to the present invention;

FIG. 2 is a force analysis graph of the gravity force of a shaver and the magnetic attraction force of a first magnet according to the present invention;

FIG. 3 is a graph showing the force analysis of the hair shaver according to the present invention in a vertical suspension;

FIG. 4 is a force analysis diagram of a shaver according to the present invention when tilted;

FIG. 5 is a schematic structural view of a eyebrow plucker according to the present invention;

FIG. 6 is a schematic structural view of a shaver for women according to the present invention;

FIG. 7 is a schematic structural view of a pair of vibrissa scissors provided by the present invention;

in the figure:

1. a handle; 2. a cutter head; 3. a second magnet; 4. a base; 5. a first magnet; 6. a fifth magnet; 7. a fourth magnet; 8. a third magnet.

Detailed Description

The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.

In the description of the present embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.

Example 1

In the present embodiment, the assembly of the shaver is mainly described.

Referring to fig. 1-4, a hair shaver comprising: handle 1 and the tool bit 2 of being connected with handle 1 can be dismantled, the lower part of handle 1 is provided with magnetic material or second magnet 3, with base 4 that the shaver matches, set up first magnet 5 or magnetic material in the base 4, the shaver is placed in when base 4, handle 1 with base 4 forms magnetic attraction, magnetic attraction with the gravity of shaver forms balancedly, the shaver suspends in base 4 top.

In this embodiment, set up magnetic material or second magnet, then set up first magnet or magnetic material at the base for both can form magnetic attraction, and then when magnetic attraction and gravity were balanced, realized shaving the suspension of hair ware, ensured the installation.

In this embodiment, compared with other assembly methods, the magnetic suspension has the gap between the assembly and the space, so that the assembly of the shaver has certain technological sense, and the gap can avoid bacteria caused by water drops and the like.

In this embodiment, set up magnetic material or second magnet in the lower part of handle, its purpose makes the handle lower part inhale as magnetism, and is nearer apart from the base, and easy magnetism is inhaled and is realized the suspension, and on the other hand has increased weight on the base in other words for the center on the handle has set up partly down, has realized the stable balance at center.

Example 2

In the present embodiment, the description will be focused on the arrangement of the center of gravity and the like.

Referring to the figures, the centre of gravity of the shaver is located in the lower region of the handle 1, in the region where the magnetic material or second magnet 3 is located.

In the embodiment, the center of the shaver is arranged in the lower area of the handle, the gravity is downward, the problem of heavy head and light feet is not easy to generate, the problems of toppling and the like are avoided, and the handle is ensured to be always in a suspension state instead of toppling. The specific address, the focus and magnetic material or second magnet 3 with the position setting, and the focus leans on down, make magnetic material or second magnet 3 lean on down the setting, and the position is nearer apart from the base for it can in time produce the suspension power with first magnet 5 on the base, ensures the assembly.

Further, the shaver is a manual shaver, the handle 1 is of a structure with large middle part and small two ends, the upper part of the handle 1 is further provided with a fifth magnet 6, the fifth magnet 6 is magnetically attracted with the tool bit 2, the lower part of the handle 1 is of an arc structure, and the second magnet 3 is embedded in the arc structure.

In this embodiment, the big both ends of middle part are little structure for whole center is at the middle part, then increase the fifth magnet in upper portion, make handle and tool bit magnetism inhale the connection, and set up the circular arc structure in the lower part, and then the second magnet is embedded in circular arc structure department, compare in other structures, the circular arc structure has certain radian, the state of suspending this moment, if there is certain slope, also be the circular arc slope, can not fish tail base or other structures when suspending or slope, improve safety and life.

In order to ensure a stable centre of gravity of the shaver, the centre of gravity of the shaving head 2 is located on the same axis as the centre of gravity of the handle 1.

In this embodiment, when the focus of tool bit and handle is at same axis, when both barycenters are coaxial promptly, then tool bit and handle suspend simultaneously, if the handle is perpendicular suspension in the base top this moment, then drive the tool bit also and be perpendicular suspension on the base for tool bit and handle are suspended the assembly simultaneously on the base.

In order to ensure the magnetic attraction force during the inclination, the middle area of the handle 1 is provided with a fourth magnet 7, a third magnet 8 is embedded in the base 4, the third magnet 8 and the fourth magnet 7 do not generate the magnetic attraction force when the shaver is perpendicular to the base 4, and the third magnet 8 and the fourth magnet generate the magnetic attraction force 7 when the shaver is in the inclined state.

In this embodiment, set up the fourth magnet in the middle part of the handle, it can be so that the focus is in the middle part always, and its and the base on the fourth magnet, when perpendicular, the distance is far away, and then difficult production magnetic attraction, and if the slope sets up, then the fourth magnet is close to the third magnet, and then produces magnetic attraction for handle and tool bit are in the state that nevertheless can not empty with the base slope, have realized the assembly mode of tilting.

Referring to fig. 2, the first magnet 5 is set to generate a magnetic attraction force F, and the gravity G in the vertical state of the shaver satisfies F/G (Cos θ -Sin θ) +1 when the shaver is inclined at an angle θ to the horizontal direction of the base 4 so that the shaver does not come off the base.

In this embodiment, through the relation of gravity and magnetic attraction, guaranteed to shave the hair ware under the effect of magnetic attraction, guaranteed the suspension all the time on the base, and then make the handle top still set up the shaver of tool bit, can suspend the installation under the effect of magnetic attraction.

In order to further secure the center of gravity, in the present embodiment, the adjustment of the center of gravity of the shaver is performed by adjusting the length of the fourth magnet 7.

In this embodiment, in order to secure the center of gravity of the hair razor, it is necessary to set the handle downward so that the handle is fitted to the base, and therefore, when the weight of the hair razor or the like changes, the length of the fourth magnet is adjusted accordingly so that the entire weight is increased, and the center of gravity is adjusted.

In particular, in the same position, the length of the fourth magnet 7 is lengthened, corresponding to a corresponding increase in the center of gravity of the shaver.

In particular, the fourth magnet 7 is lengthened by 5mm, and the center of gravity of the shaver is correspondingly raised by 0.2 mm. When the length of the fourth magnet 7 is increased, the entire weight is increased, and the center of gravity is raised accordingly.

In order to ensure mutual left and right of the third magnet 8 and the fourth magnet 7, the distance between the bottom surface of the fourth magnet 7 and the top end surface of the third magnet 8 is 10-60 mm.

In this embodiment, the distance between the fourth magnet group and the third magnet group is not suitable for being too close, a magnetic field is easily generated when the distance is too close, a gravity center is shifted when the distance is too far, suspension is affected, and further, the generated magnetic field strength is different in the corresponding height.

Specifically, the magnetic force of the fourth magnet 7 is 800-.

In this embodiment, the third magnet has the largest magnetic force, surrounds the base, generates a stronger magnetic field, interacts with the magnetic field of the fourth magnet having the lowest magnetic field, and judges whether magnetic attraction needs to be generated according to requirements; the magnetic field strength of the first magnet and the second magnet is centered, and the purpose of the magnetic field strength is to ensure suspension and to ensure the realization of the whole suspension assembly.

Example 3

In this embodiment, a practical application of the shaver is described.

In this embodiment, the shaver comprises a shaving head 2 and a handle 1, and the shaver is suspended on a base 4, so that the shaver can be assembled, and the shaver is assembled in a suspension manner in practice.

In practical use, after use, when the shaver is put into the base 4, the groove is arranged in the base 4, the second magnet 3 on the handle 1 is adsorbed with the first magnet 5 in the base 4 to generate a suction force F, when the gravity G and the suction force F of the shaver are equal, the main body is supported on the base, and the main body and the base are in a vertical state in the horizontal direction. The repulsive magnetic force generated by the third magnet 8 and the fourth magnet 7 installed in the handle 1 is 0, and the third magnet is not restricted by the relevant force of the body, so that the vertical self-standing installation is realized.

When the shaver is inclined at a certain angle theta to the horizontal direction of the base 4 (i.e. the included angle between the body and the base is decreased from 90 degrees to 0 degrees), the body weight force is decomposed into two forces, one towards the suction force direction G1 and one towards the repulsion force direction G2 according to the composition and decomposition of the forces.

In this case, G1 is g.sin θ, and G2 is g.cos θ. To want them not to fall out of the base, the relationship needs to be satisfied: f + G1-G + G2, i.e., F + g.sin θ -G + g.cos θ, simplified to

F/G is (Cos theta-Sin theta) +1, and F/G is more than or equal to 1 according to the formula shown in the figure

The repelling force F1(G2) increases with decreasing angle, F/G ≧ 1, so that the shaver will rock back and forth within the recess of the chassis 4 without pouring out of the chassis.

In this embodiment, the fourth magnet 7 has another function of serving as a weight and lowering the center of gravity of the body. In order to make the body not feel heavy and light, the fourth magnet 7 is arranged at the lower position of the middle part of the handle 1, the gravity center of the fourth magnet 7 is lower as the fourth magnet is closer to the bottom of the handle, and the gravity center of the body is lower, so that the self-standing state is easier to realize. However, the position of the fourth magnet 7 cannot be lower than the upper end of the annular third magnet 8, otherwise the fourth magnet 7 is easily adsorbed with the annular third magnet 8. The half height of the fourth magnet 7 cannot exceed the middle position of the handle, otherwise, the gravity center can shift to the head, the head is heavy, the feet are light, the magnetic attraction self-supporting is not facilitated, and the use experience of the magnetic attraction self-supporting device can be reduced. The center of gravity of the body is highest and can not exceed the middle position of the body. The center of gravity adjustment can also be fine-tuned by lengthening the length of the fourth magnet 7.

In this embodiment, the fourth magnet 7 is lengthened by 5mm at the same position, and the center of gravity of the body is correspondingly raised by 0.2 mm. The distance between the bottom end surface of the fourth magnet 7 and the top end surface of the ring magnet 3 is within 20mm, and a position of 10-15mm is an ideal distance. Beyond the 20mm position, the force between the magnetic forces becomes weaker and self-supporting cannot be achieved under the same conditions. The magnetic force data of each magnet is as follows: the magnetic force of the annular third magnet 8 is about 1000 gauss, the magnetic force of the middle second magnet 5 of the base is about 2000 gauss, the magnetic force of the first magnet 3 at the bottom of the handle is about 3000 gauss, and the magnetic force of the fourth magnet 7 is not lower than 3600 gauss. The weight of the body in this magnetic force range is controlled to be in the range of 21 g-43 g. Below 21g or above 43g, the center of gravity may be biased toward the head, may go beyond the equilibrium point, and may not be self-supporting. This example is about 25 g.

In this embodiment, an optimized magnetic field correlation receipt is set by studying magnetic force and matching with a correlation theory generated by a magnetic field, so as to ensure the realization of the levitation effect.

Further, in the present embodiment, the tip of the handle 1 is rounded and slightly pointed, so that the contact surface between the main body and the base is small, and the effect of self-standing and shaking is achieved with a small contact surface.

The main factors influencing the self-standing in this embodiment are the position of the center of gravity of the shaver, the strength of the magnetic forces of the first magnet 5 and the second magnet 3 formed by the magnets, and the distance between the upper end face of the ring magnet (i.e., the third magnet 8) and the lower end face of the magnet in the middle of the handle (i.e., the fourth magnet 7). Therefore, in order to better perform the correlation, the present embodiment has been studied to obtain the above magnetic field and weight data.

In the embodiment, the shaver comprises a eyebrow shaver, a nose hair cutter, a lady shaver and other beauty treatment products, and generally comprises a base, a handle and a cutter head, wherein the shaver is suspended through control, calculation and the like of a magnetic field, so that the magnetic attraction and the gravity balance are ensured, and the problems of handle falling and the like are avoided. A

The principle in this embodiment is as follows:

the magnetic suspension handle is a typical electromechanical integrated system, applies the scientific means of magnetic suspension, namely the magnetic circuit law and the dynamic principle of magnetic force generated by a magnetic field area, and consists of a controller and an actuator. The magnetic field direction and the geometric gravity center of the upper magnet are protected on the same straight line, and the magnetic force is the same as the gravity of the upper magnet, so that the upper special body can be suspended at a certain point in the air.

Example 4

In the present embodiment, the present invention will be described with reference to other shaving apparatuses for practical use.

First, referring to fig. 5, in the eyebrow plucker, the weight of the blade head 2 is relatively less than that of the razor, and at this time, the blade head 2 and the handle 1 are directly placed in the base 4, and then the first magnet 5 (not shown in the figure) in the base 4 forms a magnetic attraction force, which is balanced with the gravity of the eyebrow plucker, and the eyebrow plucker floats above the base 4.

Referring next to fig. 6, which illustrates a shaver for women, the same problem as that of a shaver is that the head and feet are heavy, the shaver head 2 is relatively heavy, and the second magnet 3 can be arranged on the handle 1 to keep the center of gravity stable and suspended on the base 4 (not shown in this figure).

Referring again to fig. 7, a nose hair trimmer will be described. Referring to fig. 7, the vibrissa scissor, although relatively complicated in structure, includes a cutter head 2, a micro motor, a battery, a second magnet 3 and the like in a handle 1, which is not heavy in weight, and a proper magnet is matched with a proper position at the tail part of the vibrissa scissor to form the second magnet, so that magnetic suspension and self-supporting are realized.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A hair shaver, comprising: the shaver comprises a handle and a shaver head detachably connected with the handle, wherein a magnetic material or a second magnet and a base matched with the shaver are arranged at the lower part of the handle, a first magnet or a magnetic material is arranged in the base, when the shaver is placed on the base, the handle and the base form magnetic attraction, the magnetic attraction and the gravity of the shaver form balance, and the shaver is suspended above the base.

2. A shaver as claimed in claim 1, wherein the centre of gravity of the shaver is located in a lower region of the handle, the centre of gravity being located in a region where the magnetic material or the second magnet is located.

3. The hair shaver as claimed in claim 1, wherein the hair shaver is a manual hair shaver, the handle has a structure with a large middle part and two small ends, the upper part of the handle is further provided with a fifth magnet, the fifth magnet is magnetically connected with the cutter head, the lower part of the handle has an arc structure, and the second magnet is embedded in the arc structure.

4. A shaver as claimed in claim 3, wherein the centre of gravity of the cutter head is on the same axis as the centre of gravity of the handle.

5. A hair shaver as claimed in claim 2, wherein a fourth magnet is provided in a central region of said handle, a third magnet is embedded in said base, said third magnet and said fourth magnet are not magnetically attracted when said hair shaver is oriented perpendicular to said base, and said third magnet and said fourth magnet are magnetically attracted when said hair shaver is in a tilted state.

6. A shaver as claimed in claim 5, characterized in that the first magnet is arranged to generate a magnetic attraction force F, and the gravity force G in the vertical state of the shaver is such that F/G (Cos θ -Sin θ) +1 is satisfied when the shaver is tilted at an angle θ to the horizontal direction of the base, so that the shaver does not fall off the base.

7. A shaver as claimed in claim 5, characterized in that the adjustment of the centre of gravity of the shaver is carried out by adjusting the length of the fourth magnet.

8. A hair shaver as claimed in claim 7, wherein the fourth magnet is of an increased length at the same position, corresponding to a correspondingly increased centre of gravity of the hair shaver.

9. A shaver as claimed in claim 5, wherein the bottom face of the fourth magnet is spaced from the top end face of the third magnet by a distance of 10-60 mm.

10. The device as claimed in claim 9, wherein the magnetic force of the fourth magnet is 800-1200 Gauss, the magnetic force of the first magnet is 1500-2500 Gauss, the magnetic force of the second magnet is 2500-3500 Gauss, and the magnetic force of the third magnet is not less than 3600 Gauss.