CN214501096U - Light changing mechanism for vehicle lamp - Google Patents

Abstract

The utility model relates to a car light becomes light mechanism, its technical scheme main points are: the device comprises a mounting plate, a light blocking sheet, a transmission assembly, a magnetic strip, an electromagnetic assembly and a shell, wherein the mounting plate is used for being mounted in a car lamp; the shell is fixedly connected with the mounting plate; the electromagnetic assembly and the magnetic strip are arranged in the shell; the magnetic strip is fixedly connected with the transmission assembly; the transmission assembly is rotationally connected with the shell; the transmission assembly is fixedly connected with the light blocking sheet; the light barrier is rotationally connected with the mounting plate; the light blocking sheet has the effects of enabling the movement of the light blocking sheet to be more stable and small in size.

Description

Light changing mechanism for vehicle lamp

Technical Field

The utility model relates to a car light switches technical field, and more specifically says that it relates to a car light becomes light mechanism.

Background

At present, in the process of automobile driving, especially under the condition of driving at night or in darker sections, the dipped headlight needs to be turned on usually, so that the driver can clearly see the road surface and the front condition, and the dazzling of the driver on the opposite lane can not be caused, but in heavy fog weather or heavy rain weather, if the dipped headlight is turned on, the road surface and the front condition are difficult to see, the high beam needs to be switched, and therefore, the high beam and the low beam need to be switched by the automobile light changing mechanism usually.

In addition, the existing light changing mechanism for the car light usually includes a light blocking sheet, which is a low beam when the light blocking sheet is closed, and a high beam when the light blocking sheet is opened, but the switching between the closed state and the opened state of the light blocking sheet is not stable enough, so that the switching effect of the high beam and the low beam is affected, therefore, it is necessary to develop a light changing mechanism for the car light, which makes the movement of the light blocking sheet more stable.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model aims to provide a car light becomes mechanism, have the function advantage that makes the motion of light barrier more steady, small.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a vehicle light dimmer mechanism comprising: the device comprises a mounting plate, a light blocking sheet, a transmission assembly, a magnetic strip, an electromagnetic assembly and a shell, wherein the mounting plate is used for being mounted in a car lamp; the shell is fixedly connected with the mounting plate; the electromagnetic assembly and the magnetic strip are arranged in the shell; the magnetic strip is fixedly connected with the transmission assembly; the transmission assembly is rotationally connected with the shell; the transmission assembly is fixedly connected with the light blocking sheet; the light barrier is rotatably connected with the mounting plate.

Optionally, the electromagnetic assembly includes: the electromagnet comprises a first electromagnet, a second electromagnet, a third electromagnet, a fourth electromagnet and a framework; the framework is abutted against the inner wall of the shell; the framework is provided with an accommodating hole; the magnetic strip is arranged in the accommodating hole; the first electromagnet, the second electromagnet, the third electromagnet and the fourth electromagnet are all arranged on the framework.

Optionally, the first electromagnet, the second electromagnet, the third electromagnet and the fourth electromagnet are uniformly arranged on the framework along the circumferential direction of the magnetic stripe; the magnetic strip is a radial magnetizing magnetic strip.

Optionally, the first electromagnet includes: a first core and a first coil; the second electromagnet includes: a second core and a second coil; the third electromagnet includes: a third core and a third coil; the fourth electromagnet includes: a fourth core and a fourth coil; the first iron core, the second iron core, the third iron core and the fourth iron core are clamped with the framework; the first coil is wound on the outer side of the first iron core; the second coil is wound on the outer side of the second iron core; the third coil is wound on the outer side of the third iron core; and the fourth coil is wound on the outer side of the fourth iron core.

Optionally, the transmission assembly includes: the rotating shaft, the first gear and the second gear; the rotating shaft is rotatably connected with the shell; the rotating shaft is fixedly connected with the first gear; the first gear is in meshed connection with the second gear; the inner peripheral surface of the magnetic strip is fixedly connected with the outer peripheral surface of the rotating shaft; the second gear is fixedly connected with the light blocking sheet.

Optionally, the method further includes: the first limiting column and the second limiting column; the first limiting column and the second limiting column are sleeved on the rotating shaft; one end of the first limiting column is abutted with one end of the shell, and the other end of the first limiting column is abutted with one end of the magnetic strip; one end of the second limiting column is connected with the other end of the shell in an abutting mode, and the other end of the second limiting column is connected with the other end of the magnetic stripe in an abutting mode.

Optionally, the method further includes: the connecting rod and the torsional spring are used for balancing the light blocking sheet; one end of the connecting rod is fixedly connected with one end of the mounting plate, and the other end of the connecting rod is fixedly connected with the other end of the mounting plate; the torsion spring is arranged on the connecting rod; the light blocking sheet is rotationally connected with the connecting rod; one end of the torsion spring is abutted to the mounting plate, and the other end of the torsion spring is abutted to the light blocking sheet.

Optionally, the housing includes: a first side cover, a second side cover and a housing; one end of the shell is clamped with the first side cover, and the other end of the shell is clamped with the second side cover; the shell is fixedly connected with the mounting plate; the electromagnetic assembly is respectively abutted against the inner surface of the shell and the inner surfaces of the first side cover and the second side cover; the magnetic strip is arranged in the shell; the transmission assembly is respectively connected with the first side cover and the second side cover in a rotating mode.

To sum up, the utility model discloses following beneficial effect has:

1. the magnetic field generated by the electromagnetic assembly drives the magnetic strip to rotate, so that the magnetic strip drives the transmission assembly, and then the transmission assembly drives the light blocking sheet to rotate, so that the movement of the light blocking sheet is more stable;

2. the first electromagnet, the second electromagnet, the third electromagnet and the fourth electromagnet are uniformly arranged on the framework along the circumferential direction of the magnetic stripe, so that the magnetic stripe is stressed more uniformly and can be kept in a balanced state after being rotated, and the light blocking sheet is kept in the balanced state after being rotated;

3. the first limiting column and the second limiting column are arranged, so that the magnetic strip can be prevented from axial displacement;

4. through the setting of torsional spring and connecting rod, realized the reset of light blocking piece and magnetic stripe.

Drawings

FIG. 1 is a schematic view of the state of the light barrier after the electromagnetic assembly is powered off;

fig. 2 is a schematic diagram of the overall structure of the electromagnetic assembly of the present invention;

fig. 3 is a cross-sectional view of the inside of the housing of the present invention;

fig. 4 is a schematic diagram of the state of the light blocking sheet after the electromagnetic assembly is powered on.

In the figure: 1. mounting a plate; 11. a connecting rod; 12. a torsion spring; 2. a light blocking sheet; 3. a transmission assembly; 31. a rotating shaft; 32. a first gear; 33. a second gear; 4. a magnetic strip; 5. an electromagnetic assembly; 51. a first electromagnet; 511. a first iron core; 512. a first coil; 52. a second electromagnet; 53. a third electromagnet; 531. a third iron core; 532. a third coil; 54. a fourth electromagnet; 55. a framework; 6. a housing; 61. a first side cover; 62. a second side cover; 63. a housing; 7. a first limit post; 8. a second limit post.

Detailed Description

In order to make the objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. Several embodiments of the invention are given in the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; 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 present invention can be understood according to specific situations by those skilled in the art. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature. The terms "vertical," "horizontal," "left," "right," "up," "down," and the like are used for descriptive purposes only and are not intended to indicate or imply that the referenced device or element must be in a particular orientation, constructed and operated, and therefore should not be construed as limiting the present invention.

The present invention will be described in detail with reference to the accompanying drawings and examples.

The utility model provides a car light becomes light mechanism, as shown in figure 1 and figure 2, include: the device comprises a mounting plate 1, a light barrier 2, a transmission assembly 3, a magnetic strip 4, an electromagnetic assembly 5 and a shell 6, wherein the mounting plate 1 is used for being mounted in a car lamp; the shell 6 is fixedly connected with the mounting plate 1; the electromagnetic assembly 5 and the magnetic strip 4 are both arranged in the shell 6; the magnetic strip 4 is fixedly connected with the transmission assembly 3; the transmission assembly 3 is rotationally connected with the shell 6; the transmission assembly 3 is fixedly connected with the light blocking sheet 2; the light barrier 2 is rotatably connected with the mounting plate 1.

In practical application, the mounting plate 1 is mounted between a reflection cup and a car lamp lens body of a car lamp, under the condition that the distance light of the car lamp needs to be switched, the electromagnetic assembly 5 is electrified to generate a magnetic field, the magnetic field generates acting force on the magnetic stripe 4, so that the magnetic stripe 4 rotates, the magnetic stripe 4 drives the transmission assembly 3 to rotate, the transmission assembly 3 drives the light blocking sheet 2 to rotate, and the distance light of the car lamp is switched; in the prior art, the magnetic field generated by the electromagnet drives the magnetic strip 4 to do linear motion, then the magnetic strip 4 drives the light blocking sheet 2 to move, and the magnetic strip 4 drives the light blocking sheet 2 to move to occupy more space, so that the light changing mechanism in the prior art has larger volume; magnetic field drive magnetic stripe 4 that produces through electromagnetic component 5 in this application rotates for magnetic stripe 4 drives drive assembly 3 and rotates, then drive assembly 3 drives light barrier 2 and rotates, makes the motion of light barrier 2 more steady, and magnetic stripe 4 self rotates shared space less, and light barrier 2 rotates shared space also less, makes this application still have small advantage.

Further, as shown in fig. 2 and 3, the electromagnetic assembly 5 includes: a first electromagnet 51, a second electromagnet 52, a third electromagnet 53, a fourth electromagnet 54, and a bobbin 55; the framework 55 is abutted against the inner wall of the shell 6; the framework 55 is provided with a containing hole; the magnetic strip 4 is arranged in the accommodating hole, and the magnetic strip 4 can rotate in the accommodating hole; the first electromagnet 51, the second electromagnet 52, the third electromagnet 53 and the fourth electromagnet 54 are all arranged on the framework 55.

Specifically, the upper, lower, left, right, front and rear ends of the framework 55 are abutted to the inner wall of the shell 6, so that the framework 55 can be stably located in the shell 6, the first electromagnet 51, the second electromagnet 52, the third electromagnet 53 and the fourth electromagnet 54 can be stably arranged in the shell 6, the first electromagnet 51, the second electromagnet 52, the third electromagnet 53 and the fourth electromagnet 54 are prevented from rotating after being electrified, and the magnetic strip 4 is ensured to rotate under the action of a magnetic field generated by the first electromagnet 51, the second electromagnet 52, the third electromagnet 53 and the fourth electromagnet 54.

Further, as shown in fig. 2, the first electromagnet 51, the second electromagnet 52, the third electromagnet 53 and the fourth electromagnet 54 are circumferentially and uniformly arranged on the framework 55 along the magnetic stripe 4; the magnetic strip 4 is a radial magnetizing magnetic strip; the acting force that first electro-magnet 51 produced the magnetic stripe 4, the acting force that second electro-magnet 52 produced the magnetic stripe 4, the acting force that third electro-magnet 53 produced the magnetic stripe 4 and the axial of the all perpendicular to magnetic stripe 4 of acting force that fourth electro-magnet 54 produced the magnetic stripe 4, thereby produce attraction or repulsion to the magnetic stripe 4 that radially magnetizes, realize the rotation of magnetic stripe 4, after changing first electro-magnet 51, second electro-magnet 52, the direction of the circular telegram electric current of third electro-magnet 53 and fourth electro-magnet 54, can change the direction of rotation of magnet, realize that magnet drives the counter rotation of drive assembly 3.

In the application, the first electromagnet 51 is arranged at the top end of the framework 55, the second electromagnet 52 is arranged at the front end of the framework 55, the third electromagnet 53 is arranged at the bottom end of the framework 55, the fourth electromagnet 54 is arranged at the rear end of the framework 55, the accommodating holes penetrate through the left end and the right end of the framework 55, the accommodating holes are respectively parallel to the first electromagnet 51, the second electromagnet 52, the third electromagnet 53 and the fourth electromagnet 54, the magnets and the accommodating holes are coaxial, so that the first electromagnet 51, the second electromagnet 52, the third electromagnet 53 and the fourth electromagnet 54 uniformly surround the periphery of the magnetic strip 4, the stress of the magnetic strip 4 is more uniform, the magnetic strip 4 can keep a balanced state after being influenced by the magnetic field generated by the first electromagnet 51, the magnetic field generated by the second electromagnet 52, the magnetic field generated by the third electromagnet 53 and the magnetic field generated by the fourth electromagnet 54, and the transmission assembly 3 also keeps the balanced state, therefore, the light barrier 2 keeps a balanced state after rotating, and the stability of the application is improved.

Further, as shown in fig. 2 and 3, the first electromagnet 51 includes: a first core 511 and a first coil 512; the second electromagnet 52 includes: a second core and a second coil; the third electromagnet 53 includes: a third core 531 and a third coil 532; the fourth electromagnet 54 includes: a fourth core and a fourth coil; the first iron core 511, the second iron core, the third iron core 531 and the fourth iron core are all clamped with the framework 55; the first coil 512 is wound on the outer side of the first iron core 511; the second coil is wound on the outer side of the second iron core; the third coil 532 is wound on the outer side of the third iron core 531; the fourth coil is wound on the outer side of the fourth iron core; the first coil 512, the second coil, the third coil 532 and the fourth coil are wrapped by coil packages, so that the protection of the first coil 512, the second coil, the third coil 532 and the fourth coil is enhanced.

Specifically, a first clamping hole is formed in the top end of the framework 55, a second clamping hole is formed in the front end of the framework 55, a third clamping hole is formed in the bottom end of the framework 55, and a fourth clamping hole is formed in the rear end of the framework 55; the first clamping hole, the second clamping hole, the third clamping hole and the fourth clamping hole are communicated with the accommodating hole; the first iron core 511 is clamped with the first clamping hole, the second iron core is clamped with the second clamping hole, the third iron core 531 is clamped with the third clamping hole, and the fourth iron core is clamped with the fourth clamping hole; in the application, the first coil 512 is wound on the outer side of the first clamping hole to realize the winding of the first iron core 511, the second coil is wound on the outer side of the second clamping hole to realize the winding of the second iron core, the third coil 532 is wound on the outer side of the third clamping hole to realize the winding of the third iron core 531, and the fourth coil is wound on the outer side of the fourth clamping hole to realize the winding of the fourth iron core; the first iron core 511, the second iron core, the third iron core 531 and the fourth iron core are clamped with the framework 55, so that the first electromagnet 51, the second electromagnet 52, the third electromagnet 53 or/and the fourth electromagnet 54 can be conveniently disassembled and replaced.

Further, as shown in fig. 1 and 3, the transmission assembly 3 includes: a rotating shaft 31, a first gear 32, and a second gear 33; one end of the rotating shaft 31 is rotatably connected with one end of the shell 6; the other end of the rotating shaft 31 penetrates through the other end of the shell 6 and is fixedly connected with the first gear 32; the first gear 32 is meshed with the second gear 33; the inner peripheral surface of the magnetic strip 4 is fixedly connected with the outer peripheral surface of the rotating shaft 31; the second gear 33 is fixedly connected with the light blocking sheet 2.

Under the condition that the magnetic stripe 4 rotates, the magnetic stripe 4 drives the rotating shaft 31 to rotate, the first gear 32 is driven to rotate by rotation, the second gear 33 is driven to rotate by the first gear 32, the light blocking sheet 2 is driven to rotate by the second gear 33, the angle of the light blocking sheet 2 is changed, and the switching of the distance light and the passing light of the car lamp is realized; the first gear 32 and the second gear 33 are matched, so that the process of driving the light blocking sheet 2 to rotate by the transmission assembly 3 is more stable.

Further, as shown in fig. 3, the method further includes: a first 7 and a second 8 spacing post; the first limiting column 7 and the second limiting column 8 are sleeved on the rotating shaft 31; one end of the first limiting column 7 is abutted with one end of the shell 6, and the other end of the first limiting column is abutted with one end of the magnetic strip 4; one end of the second limiting column 8 is abutted against the other end of the shell 6, and the other end of the second limiting column is abutted against the other end of the magnetic stripe 4; through the setting of first spacing post 7 and the spacing post 8 of second, can prevent that magnetic stripe 4 from taking place axial displacement, further improved the stability of this application.

Further, as shown in fig. 1 and 4, the method further includes: a connecting rod 11 and a torsion spring 12 for balancing the light blocking sheet 2; one end of the connecting rod 11 is fixedly connected with one end of the mounting plate 1, and the other end of the connecting rod is fixedly connected with the other end of the mounting plate 1; the torsion spring 12 is arranged on the connecting rod 11; the light barrier 2 is rotationally connected with the connecting rod 11; one end of the torsion spring 12 is abutted against the mounting plate 1, and the other end is abutted against the light blocking sheet 2.

Under the condition that the electromagnetic assembly 5 is electrified, the electromagnetic assembly 5 drives the transmission assembly 3 to rotate through the magnetic strip 4, the transmission assembly 3 drives the light blocking sheet 2 to rotate, and the light blocking sheet 2 rotates clockwise around the connecting rod 11; after 5 deenergizations of electromagnetic component, because the elastic force of torsional spring 12, including magnetic stripe 4 does not receive the influence of electromagnetic component 5, torsional spring 12 drives 2 anticlockwise rotations in the light barrier, make light barrier 2 rotate to the state before electromagnetic component 5 does not switch on, light barrier 2 drives second gear 33 and rotates, second gear 33 drives first gear 32 and rotates, first gear 32 drives pivot 31 and rotates, pivot 31 drives magnetic stripe 4 and rotates, make magnetic stripe 4 rotate to the state before electromagnetic component 5 does not switch on, the reset of light barrier 2 and magnetic stripe 4 has been realized.

Further, as shown in fig. 1 and 3, the housing 6 includes: a first side cover 61, a second side cover 62, and a housing 63; one end of the shell 63 is clamped with the first side cover 61, and the other end of the shell is clamped with the second side cover 62; the shell 63 is fixedly connected with the mounting plate 1; the electromagnetic assembly 5 abuts against the inner surface of the housing 63 and the inner surfaces of the first side cover 61 and the second side cover 62, respectively; the magnetic strip 4 is arranged in the shell 63; the transmission assembly 3 is respectively connected with the first side cover 61 and the second side cover 62 in a rotating way; the top of skeleton 55 and the inner wall top butt of shell 63, the front end of skeleton 55 and the inner wall front end butt of shell 63, the rear end of skeleton 55 and the inner wall rear end butt of shell 63, the bottom of skeleton 55 and the bottom butt of shell 63, the left end and the first side cap 61 butt of skeleton 55, the right-hand member and the second side cap 62 butt of skeleton 55.

Through the one end and the first side cover 61 joint of shell 63, the other end with second side cover 62 joint is convenient for carry out the dismouting to first side cover 61 and second side cover 62 to be convenient for overhaul and change the parts that lie in shell 63 such as electromagnetic component 5, magnetic stripe 4.

The car light dimming mechanism of the utility model drives the magnetic stripe 4 to rotate through the magnetic field generated by the electromagnetic component 5, so that the magnetic stripe 4 drives the transmission component 3, and then the transmission component 3 drives the light blocking sheet 2 to rotate, so that the movement of the light blocking sheet 2 is more stable, and the volume of the car light dimming mechanism is small; the first electromagnet 51, the second electromagnet 52, the third electromagnet 53 and the fourth electromagnet 54 are uniformly arranged on the framework 55 along the circumferential direction of the magnetic stripe 4, so that the magnetic stripe 4 is stressed more uniformly and can be kept in a balanced state after being rotated, and the light blocking sheet 2 is kept in the balanced state after being rotated; through the arrangement of the first limiting column 7 and the second limiting column 8, the magnetic stripe 4 can be prevented from axial displacement; the resetting of the light blocking sheet 2 and the magnetic strip 4 is realized through the arrangement of the torsion spring 12 and the connecting rod 11.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (8)

1. A light dimmer mechanism for a vehicle lamp, comprising: the device comprises a mounting plate, a light blocking sheet, a transmission assembly, a magnetic strip, an electromagnetic assembly and a shell, wherein the mounting plate is used for being mounted in a car lamp; the shell is fixedly connected with the mounting plate; the electromagnetic assembly and the magnetic strip are arranged in the shell; the magnetic strip is fixedly connected with the transmission assembly; the transmission assembly is rotationally connected with the shell; the transmission assembly is fixedly connected with the light blocking sheet; the light barrier is rotatably connected with the mounting plate.

2. The vehicle light dimmer mechanism of claim 1 wherein said electromagnetic assembly comprises: the electromagnet comprises a first electromagnet, a second electromagnet, a third electromagnet, a fourth electromagnet and a framework; the framework is abutted against the inner wall of the shell; the framework is provided with an accommodating hole; the magnetic strip is arranged in the accommodating hole; the first electromagnet, the second electromagnet, the third electromagnet and the fourth electromagnet are all arranged on the framework.

3. The vehicle light dimming mechanism according to claim 2, wherein the first, second, third and fourth electromagnets are uniformly arranged on the framework along the circumferential direction of the magnetic stripe; the magnetic strip is a radial magnetizing magnetic strip.

4. The vehicle light dimmer mechanism of claim 3 wherein said first electromagnet comprises: a first core and a first coil; the second electromagnet includes: a second core and a second coil; the third electromagnet includes: a third core and a third coil; the fourth electromagnet includes: a fourth core and a fourth coil; the first iron core, the second iron core, the third iron core and the fourth iron core are clamped with the framework; the first coil is wound on the outer side of the first iron core; the second coil is wound on the outer side of the second iron core; the third coil is wound on the outer side of the third iron core; and the fourth coil is wound on the outer side of the fourth iron core.

5. The vehicle light dimmer mechanism of claim 1, wherein said transmission assembly comprises: the rotating shaft, the first gear and the second gear; the rotating shaft is rotatably connected with the shell; the rotating shaft is fixedly connected with the first gear; the first gear is in meshed connection with the second gear; the inner peripheral surface of the magnetic strip is fixedly connected with the outer peripheral surface of the rotating shaft; the second gear is fixedly connected with the light blocking sheet.

6. The vehicle light dimmer mechanism of claim 5, further comprising: the first limiting column and the second limiting column; the first limiting column and the second limiting column are sleeved on the rotating shaft; one end of the first limiting column is abutted with one end of the shell, and the other end of the first limiting column is abutted with one end of the magnetic strip; one end of the second limiting column is connected with the other end of the shell in an abutting mode, and the other end of the second limiting column is connected with the other end of the magnetic stripe in an abutting mode.

7. A vehicle light dimmer mechanism as claimed in any one of claims 1 to 6, further comprising: the connecting rod and the torsional spring are used for balancing the light blocking sheet; one end of the connecting rod is fixedly connected with one end of the mounting plate, and the other end of the connecting rod is fixedly connected with the other end of the mounting plate; the torsion spring is arranged on the connecting rod; the light blocking sheet is rotationally connected with the connecting rod; one end of the torsion spring is abutted to the mounting plate, and the other end of the torsion spring is abutted to the light blocking sheet.

8. A vehicle light dimmer mechanism as claimed in any one of claims 1 to 6, wherein said housing comprises: a first side cover, a second side cover and a housing; one end of the shell is clamped with the first side cover, and the other end of the shell is clamped with the second side cover; the shell is fixedly connected with the mounting plate; the electromagnetic assembly is respectively abutted against the inner surface of the shell and the inner surfaces of the first side cover and the second side cover; the magnetic strip is arranged in the shell; the transmission assembly is respectively connected with the first side cover and the second side cover in a rotating mode.

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