CN218220374U - Electric toothbrush with rotary lower cover - Google Patents

Abstract

The disclosure relates to the technical field of electric toothbrushes, in particular to a lower cover rotary type electric toothbrush, which solves the problem that a sealing gasket is easily damaged due to overlarge splicing stress of a lower cover and a machine body in the electric toothbrush in the prior art; a lower cover rotary type electric toothbrush comprises an upper shell, a brush head and a lower cover, wherein a support is arranged in the upper shell, the support is detachably connected with the lower cover, the upper shell and the lower cover are connected together through the support, a fourth bump is arranged on the outer wall of the support, a first through hole is formed in the lower cover, the inner walls of the lower covers with different thicknesses are arranged at the first through hole, and a sliding groove is formed in the joint of the inner walls of the lower covers with different thicknesses; the number of the sliding grooves is two, the number of the fourth protruding blocks is two, the positions of the fourth protruding blocks correspond to the positions of the sliding grooves, and the lower cover is connected with the support through the first through hole and the fourth protruding blocks.

Description

Electric toothbrush with rotary lower cover

Technical Field

The disclosure relates to the technical field of electric toothbrushes, in particular to a lower cover rotary type electric toothbrush.

Background

According to the data of American dental medical society, the first toothbrush in the world was invented in 1498 by Chinese Imperial Ming Xiaozong, and the method is to insert short and hard bristles into a bone-made handle. The reason why the decayed teeth are caused is proposed to be 'eating without rinsing' in the Stat & Kung Gong Chun, but the tooth brushing is already promoted since now although the various kinds of toothbrushes and toothpastes are not available. China is the country with the largest toothbrush production quantity in the world and is also the country with the largest toothbrush consumption quantity in the world.

The electric toothbrush is originally found in the 19 th century, and an English person embeds a magnet rod in a handle of the toothbrush and is called as the electric toothbrush, however, the first electric toothbrush in the real sense appears in 1954, is invented by a Renshi Wu Ge, is sold in the United states in 1959, and the electric toothbrush needs to be plugged into a socket for use at that time, and because the treatment on the water-electricity relationship at that time is not advanced so far today, the wired toothbrush has great potential safety hazard in tooth brushing. The first wireless electric toothbrush is provided in 1960 by general electric, a nickel cadmium battery is arranged in the toothbrush, and the toothbrush is finally free from the obstacle of a wired electric toothbrush.

Along with the development of economy and the improvement of the living standard of people, the electric toothbrush is more and more popular with modern people, and when the electric toothbrush is put into the mouth, the electric toothbrush can realize a plurality of functions such as automatic cleaning, massage and the like, and has good cleaning effect, convenience and rapidness. However, the lower cover of the traditional electric toothbrush is connected with the body in a plugging manner, and the battery needs to be repeatedly plugged every time when being replaced, so that the sealing gasket is easily damaged, the sealing performance of the electric toothbrush is affected, water possibly enters the electric toothbrush, certain potential safety hazards exist, and the service life of the electric toothbrush is affected.

SUMMERY OF THE UTILITY MODEL

To the problem that electric toothbrush received the damage easily because lower cover and fuselage grafting atress are too big among the prior art causes seal ring, the utility model provides a reasonable in design, be convenient for assemble, and can effectively weaken or avoid seal ring impaired lower cover rotation type electric toothbrush.

The technical scheme adopted by the disclosure for solving the technical problems is as follows: a lower cover rotary type electric toothbrush comprises an upper shell and a lower cover, wherein a support is arranged in the upper shell, a fourth bump is arranged on the outer wall of the support, a first through hole is formed in the side wall of the lower cover, a sliding groove is formed in the inner wall of the lower cover, and one end of the sliding groove is perpendicular to the first through hole; the number of the sliding grooves is two, the number of the fourth bumps is two, and the number of the first through holes is two; the position of the fourth bump corresponds to the position of the sliding groove, and the lower cover is connected with the bracket through the first through hole and the fourth bump.

Furthermore, the inner wall of the lower cover is provided with a third groove, a fourth groove is arranged at a corresponding position of the outer wall of the lower cover, the tops of the third groove and the fourth groove are parallel and level, the third groove and the fourth groove are both of rectangular structures, the widths of the third groove and the fourth groove are equal, and the length of the third groove is greater than that of the fourth groove.

Further, the lower cover is provided with a first conducting strip, the first conducting strip comprises a first clamping structure, a second clamping structure and a bottom, the first clamping structure and the second clamping structure are vertically arranged, the second clamping structure and the bottom are vertically arranged, the first clamping structure of the first conducting strip is provided with a clamping assembly, and the clamping assembly is connected to a third groove and a fourth groove.

Furthermore, the inner wall of the lower cover is provided with a first limiting part and a second limiting part in parallel, and the first limiting part and the second limiting part are used for circumferentially limiting the second clamping structure of the first conducting strip.

Furthermore, a third limiting part is arranged inside the lower cover, a first working hole is formed in the bottom of the first conducting strip, and the third limiting part is connected with the first working hole in a matched mode and used for limiting the first conducting strip.

Further, the cross sections of the first working hole and the third limiting member are the same in shape and size, and can be circular, elliptical or polygonal.

Further, the support is integrated into one piece, and the support outer wall is provided with first lug, it is provided with first spacing arch to go up shells inner wall, first lug quantity is two, first spacing arch quantity is two pairs, and two pairs of first spacing archs are rectangular form parallel arrangement in last shells inner wall, and a pair of first spacing arch is spacing to a first lug circumference.

Furthermore, electric toothbrush still includes the brush head, the height that first spacing arch is close to brush head one end is greater than and keeps away from brush head one end height, first spacing bellied length is greater than the length of first lug.

Furthermore, the outer wall of the support is provided with second limiting bulges, the second limiting bulges are arranged on two sides of the first lug in parallel, the second limiting bulges are two pairs, the inner wall of the upper shell is provided with the second lug, the second lug is a pair, the length of the second lug is greater than that of the second limiting bulges, and the second limiting bulges are used for limiting the circumferential movement of the second lug.

Furthermore, it is provided with first slider to go up shells inner wall, the one end and the second lug lower extreme of first slider are connected, lower cover outer wall top is provided with first concave surface, the one end of first concave surface is located first through-hole top, first slider and the first concave surface cooperation that is located first through-hole top are connected.

Furthermore, go up shells inner wall and be provided with third stop gear and fourth stop gear, third stop gear and fourth stop gear set up and are being close to the brush head end, the first joint structure of support is provided with the motor, third stop gear and fourth stop gear are used for spacing to the motor axial.

Furthermore, a fifth limiting mechanism and a sixth limiting mechanism are arranged at the upper end of the support and are upwards raised for limiting the circumferential direction of the motor.

Further, the support outer wall is provided with a third lug, the third lug sets up in first lug below, it is provided with first spacing recess to go up shells inner wall, the third lug joint is in first spacing recess department, first spacing recess is used for carrying out circumference and/or axial spacing to the third lug.

Furthermore, a battery and a spring are arranged in the support, one end of the spring is connected with the other end of the motor and is connected with the battery, one end of the battery is connected with the spring, and the other end of the battery is connected with the first conducting strip.

Furthermore, a fourth limiting part and a fifth limiting part are arranged on the outer wall of the bracket, the fourth limiting part and the fifth limiting part are arranged in parallel, a second conducting strip is arranged between the fourth limiting part and the fifth limiting part, one end of the second conducting strip is connected with the motor, the other end of the second conducting strip is connected with the first conducting strip, and the fourth limiting part and the fifth limiting part are used for limiting the second conducting strip; an eighth protrusion is arranged between the fourth limiting part and the fifth limiting part, an eighth working hole is formed in the second conductive sheet, and the eighth working hole is connected with the eighth protrusion in a matched mode.

Further, the upper shell is also provided with a switch button, and the switch button is used for controlling the starting and the closing of the electric toothbrush.

Compared with the existing products, the beneficial effects of the present disclosure are: the outer wall of the bracket is provided with a fourth bump, and the lower cover is provided with a first through hole, so that the upper shell is connected with the lower cover through the fourth bump on the bracket, the abrasion of the sealing ring caused by overlarge stress is effectively avoided, the tight connection between the lower cover and the upper shell is ensured, and the service life of the electric toothbrush is prolonged; the first lug that the support outer wall set up and the first spacing arch that last shells inner wall set up mutually support, and the second spacing arch that the support outer wall set up and the second lug that last shells inner wall set up mutually support, and the third lug that the support outer wall set up and the first spacing recess that last shells inner wall set up mutually support for the connection of going up casing and support is closely reliable.

Drawings

The present application will be described in further detail below with reference to the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of illustrating the preferred embodiments and should not be taken as limiting the scope of the present application. Furthermore, unless specifically stated otherwise, the drawings are merely schematic representations based on the concept of a composition or construction of the object being described and may include exaggerated displays and are not necessarily drawn to scale.

FIG. 1 is one of the exploded views of a lower cap rotary electric toothbrush of the present disclosure;

fig. 2 is an exploded view of a second lower cap rotary electric toothbrush of the present disclosure;

FIG. 3 is a cross-sectional view of a lower cap rotary electric toothbrush of the present disclosure;

FIG. 4 is a view illustrating a lower cap of a rotary type electric toothbrush according to the present disclosure;

FIG. 5 is a second schematic view of a lower cap of a rotary electric toothbrush according to the present disclosure;

FIG. 6 is one of the schematic structural views of an upper housing and a brush head of a lower cap rotary electric toothbrush of the present disclosure;

FIG. 7 is a second schematic structural view of an upper housing and a brush head of a rotary electric toothbrush with a lower cover according to the present disclosure;

FIG. 8 is a third schematic structural view of an upper housing and a brush head of a rotary electric toothbrush with a lower cover according to the present disclosure;

FIG. 9 is a fourth illustration of the structure of the upper housing and the brush head of a lower cap rotary electric toothbrush of the present disclosure;

FIG. 10 is a schematic view of a first conductive plate of a lower cap rotary electric toothbrush according to the present disclosure;

fig. 11 is a schematic view of the structure of an inner holder of a lower cap rotary type electric toothbrush according to the present disclosure.

Description of reference numerals:

1. an upper housing; 2. a lower cover; 3. a motor; 4. a spring; 5. a battery; 6. a support; 7. a brush head; 8. a seal ring; 9. a switch button; 11. a first limit protrusion; 12. a second bump; 13. a third limiting mechanism; 14. a fourth limiting mechanism; 15. a first conductive sheet; 16. a second conductive sheet; 17. a first limit groove; 18. a first slider; 19. a first concave surface; 101. a first bump 102 and a second limit bump; 103. a third bump; 104. a fourth bump; 105. a fifth limiting mechanism; 106. a sixth limiting mechanism; 107. a fourth limiting member; 108. a fifth limiting member; 109. an eighth bump; 21. a first limit piece; 22. a second limiting member; 23. a third limiting member; 30. a chute; 31. a first through hole; 33. A third groove; 34. a fourth groove; 40. a first clamping structure, 41 and a second clamping structure; 42. bottom, 43, clamping component, 44, first working hole.

Detailed Description

In order to make the technical solutions of the present disclosure better understood by those skilled in the art, the present disclosure will be described in detail, clearly and completely with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the disclosure and are not intended to limit the disclosure.

An embodiment of the present disclosure discloses a lower cap rotary type electric toothbrush, which is shown with reference to fig. 1 to 11.

The utility model provides a lower cover rotation type electric toothbrush, includes casing 1, brush head 7 and lower cover 2, goes up inside support 6 and the motor 3 of being provided with of casing, and motor 3 is located support 6 top, and support 6 and last casing 1 are for dismantling the connection, and support 6 and lower cover 2 can dismantle the connection. The support 6 is integrated into one piece, and 6 outer walls of support are provided with first lug 101, and first lug 101 quantity is two, goes up the casing 1 inner wall and is provided with first spacing arch 11, and first spacing arch 11 quantity is two pairs, and every is provided with a first lug 101 to first spacing arch 11 parallel arrangement in last casing 1 inner wall, every is provided with a first lug 101 to between every is first spacing arch 11, and first spacing arch 11 is spacing to first lug 101 circumference. First spacing arch 11 is close to the height of brush head 7 one end and is greater than the height of keeping away from brush head 7 one end, and the length of first spacing arch 11 is greater than the length of first lug 101, this is because motor 3 arranges in that 1 inside is close to brush head 7 one end of casing, is convenient for carry on spacingly to motor 3. The outer wall of the support 6 is provided with second limiting protrusions 102, the second limiting protrusions 102 are arranged on two sides of the first bump 101 in parallel, the number of the second limiting protrusions 102 is two, the inner wall of the upper shell 1 is provided with second bumps 12, the number of the second bumps 12 is one, the length of the second bumps 12 is larger than that of the second limiting protrusions 102, the second limiting protrusions 102 are used for limiting the circumferential movement of the second bumps 12, and the second bumps 12 are used for preventing the support 6 from shaking in the upper shell 1; a third limiting mechanism 13 is arranged between the pair of second lugs 12, the third limiting mechanism 13 is arranged close to one end of the brush head 7, the third limiting mechanism 13 is of an inverted L shape, and the third limiting mechanism 13 is used for axially limiting the motor 3 and preventing the motor 3 from shaking in the upper shell 1; the inner wall of the upper shell 1 is also provided with a fourth limiting mechanism 14, the fourth limiting mechanism 14 is of an inverted L shape, and the fourth limiting mechanism 14 is used for axially limiting the motor 3; a third bump 103 is arranged below the first bump 101, a first limiting groove 17 is arranged below the pair of first limiting bulges 11, the first limiting groove 17 is used for limiting the third bump 103 in the circumferential direction and/or the axial direction, and the third bump 103 is clamped at the first limiting groove 17, so that the bracket 6 is effectively prevented from sliding downwards in the use process of the electric toothbrush, and the connection between the upper shell 1 and the bracket 6 is enhanced; the upper end of the bracket 6 is provided with a fifth limiting mechanism 105 and a sixth limiting mechanism 106, and the fifth limiting mechanism 105 and the sixth limiting mechanism 106 are upward bulges and used for circumferentially limiting the motor 3. In this way, the upper housing 1 and the motor 3 and the bracket 6 have stable and reliable connection effects.

The lower cover 2 is integrally formed, the lower cover 2 is provided with a sealing ring 8 for preventing external dust and water from entering the interior of the electric toothbrush, the lower cover 2 is provided with a first through hole 31, the first through hole 31 is a rectangular hole, the inner walls of the lower cover 2 with different thicknesses are arranged at the position of the first through hole 31, sliding grooves 30 are arranged at the positions of the inner walls of the lower cover 2 with different thicknesses, one end of each sliding groove 30 is perpendicular to the first through hole 31, the sliding grooves 30 are two, the outer wall of the support 6 is provided with a fourth bump 104, the fourth bumps 104 are two, the fourth bumps 104 slide into the first through holes 31 through rotation from the sliding grooves 30, the arrangement is realized, the upper shell 1 is connected with the lower cover 2 through the fourth bumps 104 on the support 6, the sealing ring 8 on the lower cover 2 is not positioned at the position of a main stress point, the tight connection between the lower cover 2 and the upper shell 1 is ensured, the abrasion of the sealing ring 8 caused by overlarge stress can be avoided, and the service life of the electric toothbrush can be effectively prolonged.

Go up shells inner wall and be provided with first slider 18, the one end and the second lug 12 lower extreme of first slider 18 are connected, and lower cover outer wall top is provided with first concave surface 19, and the one end of first concave surface 19 is in first through-hole 31 top, and when last casing 1 and lower cover 2 were connected, first slider 18 card advances first concave surface 19, prevents to go up casing 1 and lower cover 2 and takes place to rock, makes the two connect better.

The inner wall of the lower cover 2 is provided with a third groove 33, the outer wall of the lower cover 2 is provided with a fourth groove 34, the third groove 33 and the fourth groove 34 are both rectangular structures, the fourth groove 34 is arranged at the corresponding position of the outer wall of the lower cover 2 and the third groove 33, the tops of the third groove 33 and the fourth groove 34 are flush, the third groove 33 and the fourth groove 34 are both rectangular structures, the width of the third groove 33 and the width of the fourth groove 34 are equal, and the length of the third groove 33 is greater than that of the fourth groove 34. The lower cover 2 is provided with a first conductive sheet 15, the first conductive sheet 15 includes a first clamping structure 40, a second clamping structure 41 and a bottom 42, the first clamping structure 40 and the second clamping structure 41 are vertically arranged, the second clamping structure 41 and the bottom 41 are vertically arranged, a first limiting member 21 and a second limiting member 22 are further arranged in the lower cover 2, the first limiting member 21 and the second limiting member 22 are arranged on the inner wall of the lower cover 2 in parallel, the first limiting member 21 and the second limiting member 22 are used for circumferential limiting of the second clamping structure 41 of the first conductive sheet 15, the first clamping structure 40 of the first conductive sheet 15 is provided with a clamping assembly 43, the clamping assembly 43 is connected at the third groove 33 and the fourth groove 34, so that the clamping assembly 43 is better fixed. The inside third locating part 23 that is provided with of lower cover 2, first conducting strip 15 bottom 42 is provided with first working hole 44, and third locating part 23 and first working hole 44 cooperate to be connected for carry on spacingly to first conducting strip 15, further guarantee the stability that first conducting strip 15 and lower cover 2 are connected, prevent that it from taking place to rock, influence overall structure's stability.

A second conducting strip 16, a fourth limiting piece 107 and a fifth limiting piece 108 are arranged on the outer wall of the bracket 6, one end of the second conducting strip 16 is connected with the motor 3, and the other end of the second conducting strip is connected with the first conducting strip 15, the fourth limiting piece 107 and the fifth limiting piece 108 are arranged on the outer wall of the bracket 6 in parallel and are perpendicular to the horizontal direction, the fourth limiting piece 107 and the fifth limiting piece 108 are used for limiting the second conducting strip 16, an eighth protrusion 109 is arranged between the fourth limiting piece 107 and the fifth limiting piece 108, at least one eighth protrusion 109 is arranged, an eighth working hole is arranged on the second conducting strip 16, at least one eighth working hole is arranged, the eighth working hole is matched and connected with the eighth protrusion 109, and the second conducting strip 16 is better connected with the outer wall of the bracket 6; the bottom of the second conducting strip 16 is provided with a second clamping mechanism, and the second clamping mechanism is connected with the corresponding position of the outer wall of the bracket 6.

Be provided with in the support 6 and be used for providing the battery 5 of electric energy for motor 3, support 6 can hold battery 5 on the one hand, plays the guard action to battery 5, and on the other hand, support 6 makes the connection of casing 1 and lower cover 2 more reliable and more stable, is provided with spring 4 between battery 5 and the motor 3, and spring 4 and motor 3 connection are passed through to battery 5's one end, and the other end and first conducting strip 15 are connected.

The upper shell 1 is provided with a switch button, when in use, a replaced battery 5 is arranged in the bracket 6, the fourth lug 104 slides into the first through hole 31 from the sliding groove 30 through rotation, the upper shell 1 is connected with the lower cover 2, one end of the battery 5 is connected with the first conducting strip 15, the first conducting strip 15 is connected with the second conducting strip 16, a closed loop is formed inside the electric toothbrush, the electric toothbrush can normally work, and the switch button 9 of the upper shell 1 is used for controlling the starting or the closing of the electric toothbrush; when changing the battery, can not cause the wearing and tearing of sealing washer 8 because of the grafting dynamics of last casing 1 and lower cover 2 is too big, when effectively prolonging electric toothbrush life, factor of safety is also higher.

The present application has been described in detail above, and specific examples thereof are used herein to explain the principles and implementations of the present application, which are presented solely to aid in understanding the present application and its core concepts. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.

Claims (12)

1. The lower cover rotary type electric toothbrush is characterized by comprising an upper shell (1) and a lower cover (2), wherein a support (6) is arranged in the upper shell (1), a fourth bump (104) is arranged on the outer wall of the support (6), a first through hole (31) is formed in the side wall of the lower cover, a sliding groove (30) is formed in the inner wall of the lower cover, and one end of the sliding groove (30) is perpendicular to the first through hole (31); the number of the sliding grooves (30) is two, the number of the fourth protruding blocks (104) is two, and the number of the first through holes (31) is two; the position of the fourth bump (104) corresponds to the position of the sliding groove (30), and the lower cover (2) is connected with the bracket (6) through the first through hole (31) and the fourth bump (104).

2. The rotary electric toothbrush with lower cover as claimed in claim 1, wherein the inner wall of the lower cover is provided with a third groove (33), the outer wall of the lower cover is provided with a fourth groove (34), the third groove (33) and the fourth groove (34) share the same top edge, the third groove (33) and the fourth groove (34) are both rectangular structures, the circumferential widths of the third groove (33) and the fourth groove (34) are equal, and the axial length of the third groove (33) is greater than that of the fourth groove (34).

3. The rotary electric toothbrush with the lower cover as claimed in claim 2, wherein the lower cover (2) is provided with a first conducting strip (15), the first conducting strip (15) comprises a first clamping structure (40), a second clamping structure (41) and a bottom (42), the first clamping structure (40) and the second clamping structure (41) are vertically arranged, the second clamping structure (41) and the bottom (42) are vertically arranged, the first clamping structure (40) is provided with a clamping assembly (43), the clamping assembly (43) is connected to the third groove (33) and the fourth groove (34), the second clamping structure (41) is used for connecting the conducting strip with the lower cover (2), and the bottom (42) is used for connecting a power supply.

4. The electric toothbrush with the rotary lower cover according to claim 3, wherein a first limiting member (21) and a second limiting member (22) are disposed in parallel on the inner wall of the lower cover (2), and the first limiting member (21) and the second limiting member (22) are used for circumferentially limiting the second clamping structure (41) of the first conductive sheet (15).

5. The electric toothbrush with a rotary lower cover according to claim 4, wherein a third limiting member (23) is disposed inside the lower cover, the bottom (42) of the first conductive plate is provided with a first working hole (44), and the third limiting member (23) is connected with the first working hole (44) in a matching manner for limiting the first conductive plate (15).

6. The rotary electric toothbrush with a lower cover as claimed in claim 1, wherein the outer wall of the bracket is provided with first protrusions (101), the inner wall of the upper casing is provided with first limiting protrusions (11), the first limiting protrusions (11) are strip-shaped, the number of the first protrusions (101) is two, the number of the first limiting protrusions (11) is two, each pair of the first limiting protrusions (11) is arranged on the inner wall of the upper casing (1) in parallel, one first protrusion (101) is arranged between each pair of the first limiting protrusions (11), and the first limiting protrusions (11) limit the first protrusions (101) circumferentially; the length of the first limiting bulge (11) is greater than that of the first bump (101).

7. The rotary electric toothbrush with a lower cover as claimed in claim 6, wherein the outer wall of the bracket is provided with second limiting protrusions (102), the second limiting protrusions (102) are arranged in parallel on both sides of the first protrusion (101), two pairs of the second limiting protrusions (102) are provided, the inner wall of the upper housing is provided with a second protrusion (12), one pair of the second protrusions (12) is provided, the length of the second protrusion (12) is greater than that of the second limiting protrusions (102), and the second limiting protrusions (102) are used for limiting the circumferential movement of the second protrusion (12).

8. The electric toothbrush with the rotary lower cover as claimed in claim 6, wherein the inner wall of the upper housing (1) is provided with a third limiting mechanism (13) and a fourth limiting mechanism (14), the upper housing is connected with the toothbrush head (7), and the third limiting mechanism (13) and the fourth limiting mechanism (14) are arranged at the end close to the toothbrush head (7); the first clamping structure of the support is provided with a motor, and the third limiting mechanism (13) and the fourth limiting mechanism (14) are used for limiting the axial direction of the motor (3).

9. The electric toothbrush with a rotary lower cover as claimed in claim 8, wherein the bracket is provided at an upper end thereof with a fifth limiting mechanism (105) and a sixth limiting mechanism (106), the fifth limiting mechanism (105) and the sixth limiting mechanism (106) are upwardly protruded for circumferentially limiting the motor (3).

10. The electric toothbrush with the rotary lower cover as claimed in claim 7, wherein the outer wall of the bracket is provided with a third protrusion (103), the third protrusion (103) is arranged below the first protrusion (101), the inner wall of the upper shell is provided with a first limiting groove (17), the third protrusion (103) is clamped at the first limiting groove (17), and the first limiting groove (17) is used for limiting the third protrusion (103) in the circumferential direction and/or the axial direction.

11. The rotary electric toothbrush with the lower cover as claimed in claim 1, wherein the inner wall of the upper housing is provided with a first sliding block (18), one end of the first sliding block (18) is connected with the lower end of the second projection (12), a first concave surface (19) is arranged above the outer wall of the lower cover, one end of the first concave surface (19) is above the first through hole (31), and the first sliding block (18) is connected with the first concave surface (19) above the first through hole in a matching way.

12. The electric toothbrush with a rotary lower cover according to claim 1, wherein a fourth limiting member (107) and a fifth limiting member (108) are disposed on an outer wall of the bracket, the fourth limiting member (107) and the fifth limiting member (108) are disposed in parallel, a second conductive sheet (16) is disposed between the fourth limiting member (107) and the fifth limiting member (108), one end of the second conductive sheet (16) is connected to the motor (3) and the other end is connected to the first conductive sheet (15), and the fourth limiting member (107) and the fifth limiting member (108) are used for limiting the second conductive sheet (16); an eighth protrusion (109) is arranged between the fourth limiting part (107) and the fifth limiting part (108), an eighth working hole is arranged on the second conducting strip (16), and the eighth working hole is connected with the eighth protrusion (109) in a matching manner.

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