Acoustic wave type electric cleaning and care appliance

Abstract

The present invention relates to an acoustic wave electric cleaning and care device with a pressure alarm device. Upper and lower bearings are fixed to the drive shaft of the device, respectively. The upper bearing is fixed to the left and right brackets of the transducer via the upper bearing fixing surface and is immovable relative to the upper bearing fixing surface. The lower bearing is fixed to the left and right brackets of the transducer via the lower bearing upper fixing surface. The lower bearing can move relative to the lower bearing upper fixing surface or the lower bearing lower fixing surface to separate the lower bearing from or contact the lower bearing upper fixing surface. The alarm device includes a lever, a light-emitting element, and a photosensitive element. The lever is provided with a shielding surface and / or a light-shielding protrusion. By changing the gap between the shielding surface and / or the light-shielding protrusion and the photosensitive element, the light energy received by the photosensitive element changes, and the corresponding electrical performance parameter of the photosensitive element is detected to detect the change, thereby obtaining the load pressure applied to the cleaning element and realizing a pressure alarm.

Description

Technical Field

[0001] The present invention relates to a sonic electric cleaning and care appliance, and more particularly to a sonic electric cleaning and care appliance with a pressure alarm device. Background Art

[0002] Existing electric cleaning tools (such as electric toothbrushes) are classified according to the movement mode of the head assembly. They can generally be divided into three types: those in which the cleaning elements and cleaning element carriers on the head assembly perform reciprocating linear motion (including up and down swinging or left and right swinging), those in which the cleaning elements and cleaning element carriers on the head assembly perform reciprocating rotational motion, and those in which the entire head assembly performs reciprocating rotational motion (referred to as sonic wave type).

[0003] In acoustic wave electric cleaning and care appliances (hereinafter referred to as cleaning and care appliances), a resonant drive system is often used to drive the cleaning elements to rotate so as to operate at the desired high efficiency. As described in the applicant's patent application PCT / CN2015 / 071696, the cleaning and care appliance includes a handle with a handle housing, a power supply part for providing power to various parts of the cleaning and care appliance, a control part for controlling the various working modes of the cleaning and care appliance and the opening or closing of the cleaning and care appliance, a trigger part for starting or closing the operation of the cleaning and care appliance, and a driver for converting input electrical energy into mechanical energy output. The driver includes a transducer, a drive coil, and a drive coil core arranged in the drive coil. When the drive coil is passed through an alternating current i, the permanent magnets distributed on the transducer are subjected to the reaction force of the electromagnetic force and drive the transducer to perform reciprocating rotation at the frequency of the alternating current, thereby driving the cleaning element carrier assembled to the drive shaft of the transducer and the cleaning elements distributed on the cleaning element carrier to perform reciprocating rotation to achieve a cleaning action. In the described structure, the transducer, the cleaning element carrier and the cleaning element have a natural frequency f 固 , the current in the driving coil has a driving frequency f0, f 固 It is very close to f0, usually it is made to satisfy 0.85f0<f 固 <1.05f0, the electromagnetic force between the driving coil and the transducer can make the transducer, the cleaning element carrier and the cleaning element in a resonant state, thereby achieving higher mechanical efficiency. In addition, the transducer includes at least two transducer elastic members (left transducer elastic member and right transducer elastic member), which utilize the bending strain of the elastic material to form a natural vibration frequency f 固 transducer, when the natural frequency of the transducer f 固 When the driving frequency f0 is very close to the driving frequency, the electromagnetic force generated by the driving coil in the handle housing and acting on the transducer puts the transducer in a resonant state. When the natural frequency of the transducer f 固When the frequency is equal to the driving frequency f0, the electromagnetic force generated by the driving coil in the handle housing and acting on the transducer puts the transducer in a resonant state.

[0004] In the invention patent of the present applicant, entitled "Electric cleaning and care appliance, pressure alarm method and device for the appliance", the pressure alarm device disclosed includes a detection, collection and alarm circuit and an alarm component. The circuit includes a power supply, a programmable microchip processor IC and an H-bridge circuit composed of transistors for connecting the power supply and the drive coil. The program of the microchip processor IC stores f 0max -n, use the f corresponding to the selected n value 0max -n is the fixed frequency f0 of the current flowing through the driving coil, where -0.3(f 0max -f 0min )≤n≤0.85(f 0max -f 0min ), f 0max The maximum value of the average voltage on the current detection resistor corresponds to the driving coil current frequency, f 0min The frequency of the driving coil current corresponding to the minimum value of the average voltage on the current detection resistor, and the average value of the power supply voltage under the alarm load is pre-stored U L源 and the current sensing resistor R 25 The average voltage U LR25 , the programmable microchip processor IC outputs a square wave with a fixed frequency f0 to drive the H-bridge circuit. If (U N源 / U L源 )×U NR25 >U LR25 , no alarm signal output or terminate the current pressure alarm signal output; if (U N源 / U L源 )×U NR25 ≤U LR25 , then the pressure alarm signal is output and the alarm is sounded. This patent reasonably adjusts the angle between the longitudinal axis of the cleaning element and the normal of the transducer elastic part plane so that the transducer natural frequency f 固 As the load on the cleaning element increases, the force increases and the natural frequency f of the transducer can be controlled. 固The rate changes with the increase of the force exerted by the load on the cleaning element. Once this fixed driving frequency is set, the driving frequency remains unchanged during the operation of the cleaning and care device, so that the amplitude of the cleaning element increases from small to large, and at the same time, the current value of the driving coil shows a monotonically decreasing trend from high to low. In this way, under a reasonable load, the personal electric cleaning and care device can be guaranteed to obtain higher mechanical efficiency, smaller working current, smaller energy consumption, maximum cleaning element amplitude, and best cleaning effect. After the load exceeds a reasonable value, the amplitude can be reduced to protect the gums. In addition, the structure is simple and the cost is low.

[0005] In another Chinese invention patent application filed by the present applicant, entitled "Photosensitive Pressure Alarm Device for Electric Cleaning and Care Appliances" (publication number 201711125025.4), the photosensitive pressure alarm device includes a light sensing portion consisting of at least one light source and at least one photosensitive unit, a light reflecting surface facing the light source and photosensitive unit, a detection circuit, and an alarm portion. The light source and photosensitive unit are disposed on a movable component that is movable relative to the handle housing or a stationary component that is stationary relative to the handle housing and are located on the same side. The light reflecting surface is disposed on the stationary component or movable component facing the light source and photosensitive unit, substantially directly opposite the light source and photosensitive unit. Under the combined action of an external force F1 applied to the cleaning element in a direction approximately along or parallel to the axis of the cleaning element along its length direction and an elastic force F2 of the elastic member generated by the elastic member built into the handle to resist the external force F1, the light source and photosensitive unit or the light reflecting surface arranged on the movable part movable relative to the handle housing move with the movable part, and the incident angle and reflection angle of the light emitted by the light source on the light reflecting surface change, so that the light receiving area of the photosensitive unit that can receive the light from the light source changes, thereby causing the electrical performance of the photosensitive unit to change.

[0006] In an invention patent application with application publication number CN 104883997 A, an electric toothbrush with a pressure sensor is disclosed, comprising: a system for determining the pressure applied by the toothbrush bristles on the user's teeth through direct force measurement; a system for determining the pressure applied by the toothbrush bristles on the user's teeth through dynamic force measurement; and a processing system for adjusting a pre-established amount of pressure indicative of excessive bristle force in response to the pressure determined through the direct force measurement and the dynamic force measurement. In this device, the direct force or displacement information is provided by a Hall effect sensor device, while the dynamic load information is also provided by a Hall effect sensor, which is used to measure the phase shift between the magnetic field response and the phase of the drive signal. Summary of the Invention

[0007] The task of the present invention is to provide an acoustic wave electric cleaning and care device with a pressure alarm device, which can greatly improve the detection accuracy of the load pressure on the cleaning element without increasing the volume and cost of the cleaning and care device, thereby improving the sensitivity of the pressure alarm device.

[0008] According to the present invention, the provided ultrasonic electric cleaning and care device includes a handle with a handle shell and a handle back shell, the handle shell contains a power supply, a circuit board, a transducer, a drive coil assembly, a cleaning assembly including a cleaning element carrier and a cleaning element, and the transducer includes: a drive shaft inserted into the cleaning assembly, left and right transducer brackets, at least two transducer permanent magnets respectively arranged on the left and right sides of the longitudinal axis L1 of the drive shaft, corresponding permanent magnet brackets, left and right transducer transmission arms fixedly connected to the permanent magnet brackets and fixedly connected to the drive shaft, and at least two transducers respectively arranged on the left and right sides of the longitudinal axis L1 of the drive shaft An elastic member, and at least one fixing member of the transducer elastic member fastened to the left and right brackets of the transducer, one end of the transducer elastic member is respectively fixedly connected to the fixing member of the transducer elastic member, and the other end of the transducer elastic member is respectively fixedly connected to the corresponding transducer transmission arm, the left and right permanent magnets are independent of each other, the magnetic pole polarity of the permanent magnet on one side in the direction toward the drive coil is opposite to the magnetic pole polarity of the permanent magnet on the other side in the direction toward the drive coil, and the left and right permanent magnets can move relative to the fixing member of the transducer elastic member; a drive shaft upper bearing and a drive shaft lower bearing are respectively fixed on the drive shaft, and the drive shaft upper bearing is fixedly connected to the left and right brackets of the transducer The fixing surface of the upper bearing of the driving shaft on the right bracket is fixed in the transducer bracket and cannot move relative to the fixing surface of the upper bearing of the driving shaft. The lower bearing of the driving shaft and the upper fixing surface of the lower bearing of the driving shaft and the lower fixing surface of the lower bearing of the driving shaft are associated with each other. The lower bearing of the driving shaft is fixed in the transducer bracket through the upper fixing surface of the lower bearing of the driving shaft located on the left and right brackets of the transducer. Therefore, the lower bearing of the driving shaft can move relative to the upper fixing surface of the lower bearing of the driving shaft or the lower fixing surface of the lower bearing of the driving shaft to achieve separation or contact between the lower bearing of the driving shaft and the upper fixing surfaces of the lower bearing of the driving shaft on the left and right brackets of the transducer; The cleaning and care appliance also includes a photosensitive pressure alarm device, which includes a lever installed on the left and right brackets of the transducer, a light-emitting element provided on the circuit board and adjacent to the lever, and a photosensitive element provided on the circuit board and adjacent to the lever. The lever is arranged with a lever shielding surface and / or a light-shielding protrusion in the direction toward the circuit board. The change in the gap between the lever shielding surface and / or the light-shielding protrusion and the photosensitive element causes the light energy emitted by the light-emitting element and passing through the gap to reach the photosensitive element to change, and the change in the corresponding electrical performance parameters of the photosensitive element is detected, thereby obtaining the load pressure F1 applied to the cleaning element.

[0009] In the present invention, the upper fixed surface of the drive shaft lower bearing and the lower fixed surface of the drive shaft lower bearing can constrain the drive shaft lower bearing to only perform limited rotation around the drive shaft transverse rotation axis L4, that is, the drive shaft lower bearing cannot contact the upper fixed surface of the drive shaft lower bearing and the lower fixed surface of the drive shaft lower bearing at the same time. When the drive shaft lower bearing contacts the lower fixed surface of the drive shaft lower bearing, the counterclockwise rotation of the drive shaft lower bearing and the drive shaft around the drive shaft transverse rotation axis L4 reaches a maximum angle, and this maximum angle is the limited angle of rotation of the drive shaft. The limited rotation angle of the drive shaft can be 0-≤2 degrees, preferably 0-≤1.5 degrees, and more preferably 1 degree.

[0010] In one embodiment, the left and right sides of the lever are respectively provided with left and right rotating axes of the lever, and the lever is provided with a protrusion of a short arm of the lever in a direction away from the lever rotation axis L3 and close to the cleaning component and in the direction toward the lower bearing of the drive shaft. The lower bearing of the drive shaft supports the short arm protrusion of the lever, and a protrusion of a long arm of the lever is provided in a direction away from the lever rotation axis L3 and close to the rear shell of the handle and in the direction toward the lower bearing of the drive shaft. A spring is wrapped around the outside of the long arm protrusion of the lever, and the bottom plane of the long arm protrusion of the lever supports one end of the spring, and the bottom plane of the spring bearing hole arranged on the left and right brackets of the transducer supports the other end of the spring.

[0011] Preferably, the left and right lever rotation axes have the same lever rotation axis L3.

[0012] Another task of the present invention is to provide a pressure alarm device for an acoustic wave electric cleaning and care appliance, the electric cleaning and care appliance includes a handle with a handle shell and a handle back shell, the handle shell contains a power supply, a circuit board, a transducer, a drive coil assembly, a cleaning assembly including a cleaning element carrier and a cleaning element, the transducer includes: a drive shaft inserted into the cleaning assembly, left and right brackets of the transducer, an upper drive shaft bearing and a lower drive shaft bearing are fixed on the drive shaft respectively, the pressure alarm device includes a lever installed on the left and right brackets of the transducer, a light-emitting element provided on the circuit board and adjacent to the lever, and a photosensitive element provided on the circuit board and adjacent to the lever, the lever is arranged with a lever shielding surface and / or a light-shielding protrusion in the direction toward the circuit board, the left and right sides of the lever are respectively provided with a left and right lever rotating shaft, and the lever is moved away from the left and right sides. A protrusion of a short arm of the lever is provided in the direction of the lever rotation axis L3 and close to the cleaning component, and in the direction toward the lower bearing of the drive shaft. The lower bearing of the drive shaft supports the short arm protrusion of the lever. A protrusion of a long arm of the lever is provided in the direction away from the lever rotation axis L3 and close to the rear shell of the handle, and in the direction toward the lower bearing of the drive shaft. A spring is provided around the outside of the long arm protrusion of the lever. The bottom plane of the long arm protrusion of the lever supports one end of the spring, and the bottom plane of the spring bearing hole arranged on the left and right brackets of the transducer supports the other end of the spring. The gap between the lever shielding surface and / or the shading protrusion and the photosensitive element changes, resulting in a change in the light energy emitted by the light-emitting element and reaching the photosensitive element through the gap. The change in the corresponding electrical performance parameters of the photosensitive element is detected, thereby obtaining the load pressure F1 applied to the cleaning element to realize a pressure alarm.

[0013] Preferably, the length of the long arm of the lever is X2, the length of the short arm of the lever is X1, and the ratio of X2 to X1 is in the range of 1.5-5; more preferably, the ratio of X2 to X1 is in the range of 2-4.

[0014] The sonic electric cleaning and care device with a pressure alarm device provided by the present invention can significantly improve the accuracy of detecting the load pressure applied to the cleaning element, thereby increasing the sensitivity of the pressure alarm device, without increasing the size and cost of the cleaning and care device. Furthermore, in the present invention, by providing an upper fixed surface on the drive shaft lower bearing and a lower fixed surface on the drive shaft lower bearing to determine the limited rotation angle of the drive shaft, the load deformation of the elastic member is effectively controlled, thereby effectively reducing or eliminating the impact of the load deformation of the elastic member on the life of the transducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention takes a sonic electric toothbrush (hereinafter referred to as an electric toothbrush) as an example to explain the cleaning and care appliance.

[0016] Figure 1 is a schematic diagram of an electric toothbrush of the present invention;

[0017] Figure 2 for Figure 1 The assembly diagram of the electric toothbrush shown shows the assembly relationship between the handle part and the head assembly;

[0018] Figure 3 for Figure 2 Schematic diagram of the transducer of the electric toothbrush;

[0019] Figure 4 for Figure 1 Schematic diagram of the transducer, drive coil, circuit board and lever assembly of the electric toothbrush in the no-load state on the cleaning element shown;

[0020] Figure 5 for Figure 1 Schematic diagram of the electric toothbrush transducer, drive coil, circuit board and lever assembly when the cleaning element is loaded;

[0021] Figure 6 for Figure 4 A partial enlarged schematic diagram;

[0022] Figure 7 for Figure 5 A partial enlarged schematic diagram;

[0023] Figure 8 It is a schematic diagram of the assembly of the right bracket of the transducer, the lever and the lower bearing of the drive shaft;

[0024] Figure 9 This is a schematic diagram of the transducer right bracket and the drive shaft lower bearing assembly;

[0025] Figure 10 This is a schematic diagram of the right bracket of the transducer;

[0026] Figure 11 It is a schematic diagram of the lever;

[0027] Figure 12 for Figure 1 The cleaning element is shown in a loaded state, and a schematic diagram of the lever and circuit board assembly;

[0028] Figure 13 for Figure 1 The cleaning element is shown in an unloaded state, and a schematic diagram of the lever and circuit board assembly;

[0029] Figure 14 Schematic diagram of the combination of the drive shaft and the bearing under the drive shaft when the drive shaft is in an unloaded state and a loaded state respectively;

[0030] Figure 15 This is a schematic diagram of the assembly of the lever and the circuit board, with the cleaning element in an unloaded state, in another embodiment of the present invention;

[0031] Figure 16for Figure 15 In the embodiment shown, the cleaning element is in a loaded state, and a schematic diagram of the lever and circuit board assembly is shown.

[0032] Description of main reference numerals

[0033] 1 is the handle

[0034] 2 is the cleaning component

[0035] 3 is the transducer

[0036] 4 is the driving coil assembly

[0037] 5 is the left bracket of the transducer

[0038] 6 is the left bracket of the driving coil

[0039] 7 is the right bracket of the transducer

[0040] 8 is the right bracket of the driving coil

[0041] 9 is the back shell of the handle

[0042] 10 for batteries

[0043] 11 is the circuit board

[0044] 12 is the fixing screw

[0045] 13 is the handle shell

[0046] 21 is a cleaning element

[0047] 31 is the spring

[0048] 32 is the leverage

[0049] 33 is the bearing on the drive shaft

[0050] 34 is the lower bearing of the drive shaft

[0051] 35 is the right permanent magnet of the transducer

[0052] 36 is the left permanent magnet of the transducer

[0053] 37 is the drive shaft

[0054] 38 is a transducer elastic member

[0055] 39 is a fixing member of the transducer elastic member

[0056] 41 is the driving coil core

[0057] 42 is a driving coil

[0058] 71 is the lever fixing hole

[0059] 72 is the spring bearing hole

[0060] 73 is the fixed surface on the lower bearing of the drive shaft

[0061] 74 is a raised through hole

[0062] 75 is the bearing fixing surface on the drive shaft

[0063] 76 is the lower fixed surface of the drive shaft lower bearing

[0064] 77 is the bottom plane of the spring bearing hole

[0065] 111 is a photosensitive element

[0066] 112 is a light emitting element

[0067] 321 is the left rotation axis of the lever

[0068] 322 is the right rotation axis of the lever

[0069] 323 is the protrusion of the short arm of the lever

[0070] 324 is the protrusion of the long arm of the lever

[0071] 325 is the lever shielding surface

[0072] 326 is the raised bottom plane of the long lever arm

[0073] 327 is the shading protrusion

[0074] X1 is the length of the short arm of the lever

[0075] X2 is the length of the lever arm

[0076] L1 is the longitudinal axis of the drive shaft

[0077] L'1 is the longitudinal axis of the drive shaft when the drive shaft is tilted relative to the longitudinal axis of the drive shaft bearing.

[0078] L2 is the transverse axis of the drive shaft bearing, which passes through the center point of the drive shaft bearing and is perpendicular to the longitudinal axis L1 of the drive shaft and is approximately parallel to the longitudinal axis L5 of the cleaning element.

[0079] L3 is the lever rotation axis

[0080] L4 is the transverse rotation axis of the drive shaft perpendicular to the transverse axis L2 of the bearing on the drive shaft and the longitudinal axis of the drive shaft

[0081] L5 is the longitudinal axis of the cleaning element

[0082] F is the external force acting on the drive shaft

[0083] F1 is the load pressure applied to the cleaning element

[0084] F2 is the load force transmitted to the protrusion of the short arm of the lever

[0085] F3 is the spring force on the protrusion on the long arm of the lever

[0086] M1 is the rotational torque

[0087] M2 is the moment of the short arm of the lever

[0088] M3 is the moment of the long arm of the lever DETAILED DESCRIPTION

[0089] As previously mentioned, the following description uses a sonic electric toothbrush as a typical example of the sonic electric cleaning and care appliance of the present invention, and further describes exemplary embodiments of the present invention in conjunction with the accompanying drawings. Although the following explanation uses an electric toothbrush as an example, the present invention is not limited thereto. The present invention may also be applied to sonic electric cleaning and care appliances for personal use, such as sonic electric shavers, sonic electric facial cleansers, and sonic electric showers.

[0090] The terms used in this specification are for the purpose of describing particular exemplary embodiments only and are not intended to be limiting.

[0091] As used in this application, the term "and / or" includes any and all combinations of one or more of the associated listed terms.

[0092] As used herein, the singular forms "a," "an," and "the" may include plural forms, unless the context clearly indicates otherwise. The words "comprise," "include," and "have" are broad and specify the presence of specified features, sets, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, sets, steps, operations, elements, components, and / or groups thereof.

[0093] Like reference numerals refer to like parts throughout the drawings.

[0094] For the sake of clarity, words that express relative spatial positions, such as "upper", "lower", "left", "right", "lateral", etc., are used in this specification to simply describe the relationship between an element or feature as shown in the figure and another element (one or more) or feature (one or more), where "upper" and "lower" are relative to the longitudinal axis of the cleaning element, and the end close to the cleaning element is defined as "upper", and the end opposite to "upper" (i.e., the end away from the cleaning element) is defined as "lower"; "left" and "right" are relative to the longitudinal axis of the drive shaft, and facing the corresponding view along the direction perpendicular to the longitudinal axis of the drive shaft, the left side of the longitudinal axis of the drive shaft is defined as "left", and the right side is defined as "right"; "lateral" refers to the direction perpendicular to the longitudinal axis of the drive shaft.

[0095] Figure 1-14 A sonic electric toothbrush is shown as an example of the electric cleaning and care appliance of the present invention. Figure 1-5 The sonic electric toothbrush of the present invention includes a handle having a handle housing 13. The handle housing 13 contains a battery 10 for providing power to various parts of the toothbrush, a circuit board 11 for controlling the opening or closing of the toothbrush and various working modes, a transducer 3 for converting input electrical energy into mechanical energy output, a drive coil assembly 4, and a cleaning assembly 2 including a cleaning element carrier and cleaning elements (i.e., bristles) 21 distributed on the cleaning element carrier. The cleaning assembly 2 is connected to the drive shaft 37 ( Figure 4 ,5) are detachably connected together. The transducer 3 includes: a drive shaft 37 inserted into the cleaning assembly; at least one fastened to the left and right brackets 5, 7 of the transducer ( Figure 2 ) of the transducer elastic member fixing member 39 ( Figure 3 At least two transducers are arranged on the left and right sides of the longitudinal axis L1 of the drive shaft, respectively, and the left and right permanent magnets 36, 35 ( Figure 3 ); for connecting the left and right permanent magnets 36 and 35 of the transducer; the left and right transducer transmission arms fixedly connected to the permanent magnet bracket and fixedly connected to the drive shaft 37; and at least two left and right transducer elastic members 38 (respectively provided on the left and right sides of the longitudinal axis L1 of the drive shaft Figure 3 ). One end of the left and right transducer elastic members 38 are respectively fixedly connected to the fixing member 39 of the transducer elastic member, and the other end of the left and right transducer elastic members 38 are respectively fixedly connected to the corresponding transducer transmission arms. The left and right permanent magnets 36 and 35 are independent of each other. The magnetic pole polarity of the permanent magnet on one side in the direction toward the driving coil is S pole or N pole, and the magnetic pole polarity of the permanent magnet on the other side in the direction toward the driving coil is opposite to the magnetic pole polarity of the permanent magnet on the one side. The left and right permanent magnets 36 and 35 can move relative to the fixing member 39 of the transducer elastic member. When the driving coil 42 ( Figure 4 ) When an alternating current with a frequency of f0 passes through, the left and right transducer permanent magnets 36 and 35 rotate back and forth around the longitudinal axis L1 of the drive shaft, and the left and right transducer permanent magnets 36 and 35 drive the drive shaft 37 to rotate back and forth around the longitudinal axis L1 of the drive shaft, and the drive shaft 37 drives the cleaning element 21 on the cleaning assembly 2 to rotate back and forth around the longitudinal axis L1 of the drive shaft.

[0096] like Figure 6-10 、 Figure 14As shown, a drive shaft upper bearing 33 and a drive shaft lower bearing 34 are respectively fixed on the drive shaft 37. The drive shaft upper bearing 33 is fixed in the transducer bracket 5, 7 through the drive shaft upper bearing fixing surface 75 located on the left and right transducer brackets 5, 7, and cannot move relative to the drive shaft upper bearing fixing surface 75. The drive shaft lower bearing 34 and the drive shaft lower bearing upper fixing surface 73 and the drive shaft lower bearing lower fixing surface 76 are associated with each other. The drive shaft lower bearing 34 is fixed in the transducer bracket 5, 7 through the drive shaft lower bearing upper fixing surface 73 located on the left and right transducer brackets 5, 7. Therefore, the drive shaft lower bearing 34 can move relative to the drive shaft lower bearing upper fixing surface 73 or the drive shaft lower bearing lower fixing surface 76 to achieve separation or contact between the drive shaft lower bearing 34 and the drive shaft lower bearing upper fixing surface 73 on the left and right transducer brackets 5, 7.

[0097] A cavity is formed on the upper fixed surface 73 of the drive shaft lower bearing located on the left and right brackets 5 and 7 of the transducer. The volume of the cavity is larger than the volume of the drive shaft lower bearing, so that the drive shaft lower bearing can be accommodated in the cavity. With this connection structure, the drive shaft lower bearing 34 can move limitedly relative to the upper fixed surface 73 of the drive shaft lower bearing or the lower fixed surface 76 of the drive shaft lower bearing. Due to the internal clearance (play) of the bearing, the drive shaft 37 can tilt relative to the longitudinal axis of the drive shaft upper bearing 33, such as Figure 14 As shown. When there is no external force F and the drive shaft 37 is not tilted relative to the longitudinal axis of the drive shaft bearing 33, the longitudinal axis L1 of the drive shaft 37 coincides with the longitudinal axis of the drive shaft bearing 33; when the drive shaft 37 is tilted relative to the longitudinal axis of the drive shaft bearing 33 under the action of the external force F, the drive shaft longitudinal axis L'1 of the drive shaft 37 is tilted relative to the longitudinal axis of the drive shaft bearing 33, and the angle between the two axes is α( Figure 14 ), α is the inclination angle of the bearing, usually the α angle is less than 2 degrees.

[0098] When a load pressure is applied to the cleaning element 21, a pressure F1 is applied to the driving shaft 37 and a rotational torque M1 is generated ( Figure 7 ), since the drive shaft bearing 33 is fixed in the left and right brackets 5 and 7 of the transducer, and the drive shaft 37 can be tilted relative to the longitudinal axis of the drive shaft bearing 33, the rotational torque M1 on the drive shaft 37 is at point O1 ( Figure 7 ) is the center point, and point O1 is the center point of the drive shaft bearing 33 located on the longitudinal axis L1 of the drive shaft. Under the action of the rotation torque M1, the drive shaft 37 rotates counterclockwise around the drive shaft transverse rotation axis L4 (not shown in the figure) with point O1 as the base point. Figure 7As shown, the lower drive shaft bearing 34 fastened to the drive shaft 37 also rotates counterclockwise around the drive shaft transverse rotation axis L4 with point O1 as the base point under the action of the rotational torque M1 formed by the load pressure F1 applied to the cleaning element 21. In the present invention, a fixed surface 73 on the lower drive shaft bearing is arranged on the left and right transducer brackets 5 and 7. The lower drive shaft bearing 34 can rotate counterclockwise around the drive shaft transverse rotation axis L4 with point O1 as the base point under the action of the rotational torque M1 to the limited angle of drive shaft rotation. The applicant has concluded through a large number of tests that the limited angle is preferably 1.5 degrees, and more preferably 1 degree. In this embodiment, the limited angle of the drive shaft rotation is selected to be 1 degree. In other embodiments, the limited angle can also be any other angle between 0 degrees and 2 degrees.

[0099] In the present invention, an upper fixed surface 73 for limiting the rotation angle of the drive shaft is provided on the lower bearing 34 of the drive shaft. When the lower bearing 34 of the drive shaft rotates counterclockwise around the transverse rotation axis L4 of the drive shaft with point O1 as the base point to the limited angle of rotation of the drive shaft under the action of the rotational torque M1, the upper fixed surface 73 of the lower bearing of the drive shaft contacts the outer surface of the lower bearing of the drive shaft 34 and limits the further rotation of the lower bearing of the drive shaft 34.

[0100] like Figure 2 、 Figure 6 、 Figure 11 As shown, a lever 32 is installed on the left and right brackets 5 and 7 of the transducer, and a left lever rotation axis 321 and a right lever rotation axis 322 are respectively provided on the left and right sides of the lever 32. The left and right lever rotation axes 321 and 322 have the same lever rotation axis L3. In the direction away from the lever rotation axis L3 and close to the cleaning component 2, and in the direction toward the lower bearing 34 of the drive shaft, a protrusion 323 of a short lever arm is provided on the lever 32. In the direction away from the lever rotation axis L3 and close to the handle rear shell 9, and in the direction toward the lower bearing 34 of the drive shaft, a protrusion 324 of a long lever arm is provided on the lever 32. The length of the lever arm from the force point of the protrusion 323 of the short lever arm to the lever rotation axis L3 is the length X1 of the short lever arm, and the length of the lever arm from the force point of the protrusion 324 of the long lever arm to the lever rotation axis L3 is the length X2 of the long lever arm. On the right bracket 7 of the transducer ( Figure 2 ) is provided with a raised through hole 74 ( Figure 9 ), on the left bracket of the transducer 5 ( Figure 2 ) are also provided with raised through holes, and the projection 323 of the lever short arm passes through the two raised through holes and contacts the lower bearing 34 of the drive shaft, and the lower bearing 34 of the drive shaft supports the projection 323 of the lever short arm. Figure 4) surrounds the outer side of the protrusion 324 of the lever long arm, the spring 31 can be a cylindrical spring, the protrusion bottom plane 326 of the lever long arm supports one end of the spring 31, and is arranged on the bottom plane 77 of the spring bearing hole on the left and right brackets 5 and 7 of the transducer ( Figure 9 ) supports the other end of the spring 31. Figure 4 and Figure 6 As shown, when the cleaning element 21 is in an unloaded state, the spring 31 is in a pre-compressed state. The preload force of the spring 31 pushes the lever 32 to rotate around the lever rotation axis L3, so that the protrusion 323 of the short arm of the lever presses the bearing 33 on the drive shaft.

[0101] like Figure 8 、 Figure 9 、 Figure 11 As shown, the right lever rotation axis 322 cooperates with the lever fixing hole 71 set on the right transducer bracket 7, and the left lever rotation axis 321 cooperates with the lever fixing hole 71 set on the left transducer bracket 5. The above two lever fixing holes 71 constrain the lever 32 to rotate only around the lever rotation axis L3.

[0102] like Figure 11 、 Figure 13 As shown, the lever 32 is provided with a lever shielding surface 325 in the direction toward the circuit board 11. When the cleaning element 21 is in an unloaded state, the light emitted by the light emitting element 112 mounted on the circuit board 11 and adjacent to the lever 11 can pass through the gap between the lever shielding surface 325 and the photosensitive element 111 mounted on the circuit board 11 and adjacent to the lever 11 to reach the photosensitive element 111. Figure 12 As shown, when the cleaning element 21 is subjected to a sufficiently large load, the lever 32 rotates clockwise around the lever rotation axis L3 under the combined action of the load force F2 on the protrusion of the short arm of the lever and the spring force F3 on the long arm of the lever, and the gap between the lever shielding surface 325 and the photosensitive element 111 gradually decreases, thereby reducing the amount of light energy emitted by the light-emitting element 112 and reaching the photosensitive element 111 through the gap between the lever shielding surface 325 and the photosensitive element 111.

[0103] When the drive shaft lower bearing 34 is subjected to a torque in a direction opposite to the rotational torque M1, or to the spring force F3 formed on the protrusion 324 of the long lever arm, it rotates clockwise around the drive shaft transverse rotation axis L4 with point O1 as the base point until the lower fixed surface 76 of the drive shaft lower bearing contacts the drive shaft lower bearing 34, restricting further rotation of the drive shaft lower bearing 34. At this time, the longitudinal axis L1 of the drive shaft 37 and the longitudinal axis of the drive shaft upper bearing 33 coincide with each other. This state is the initial state of the drive shaft 37. When the cleaning element 21 is in an unloaded state, the drive shaft 37 is in the aforementioned initial state.

[0104] In this embodiment, the bending deformation of the left and right transducer elastic members 38 is utilized to respond to the movement of the left and right transducer permanent magnets 36 and 35, causing the elastic system composed of the transducer 3 and the cleaning assembly 2 to resonate under the action of the alternating electromagnetic force from the drive coil 42, thereby achieving efficient reciprocating rotation of the cleaning element 21. Obviously, due to the internal clearance of the drive shaft bearing 33, the drive shaft 37 can tilt relative to the drive shaft bearing 33. Consequently, the left and right transducer transmission arms tilt relative to the longitudinal axis of the drive shaft bearing 33, and the left and right transducer elastic members 38 tilt relative to the longitudinal axis of the drive shaft bearing 33. However, the drive shaft bearing 33 and the transducer elastic member fixing member 39 remain stationary relative to the left and right transducer brackets 5 and 7. Consequently, the left and right transducer elastic members 38 deform relative to the transducer elastic member fixing member 39. In other words, the load pressure F1 applied to the cleaning element 21 causes the left and right transducer elastic members 38 to deform. This deformation is referred to as elastic member load deformation. The deformation of the left and right transducer elastic members 38 driven by the left and right transducer permanent magnets 36 and 35 is called elastic member drive deformation. The function of the elastic member drive deformation is to transfer the mechanical energy of the left and right transducer permanent magnets 36 and 35 to the cleaning element 21. The elastic member load deformation does not help the cleaning element 21 to obtain mechanical energy. Excessive elastic member load deformation will also aggravate the fatigue aging of the transducer elastic member, causing the transducer elastic member 38 to fatigue and fracture in a short period of time, resulting in failure of the electric cleaning and care appliance. In this embodiment, the drive shaft lower bearing upper fixed surface 73 and the drive shaft lower bearing lower fixed surface 76 are set to determine the limited rotation angle of the drive shaft, so that the elastic member load deformation is effectively controlled, thereby effectively reducing or eliminating the impact of the elastic member load deformation on the life of the transducer 3. In addition, in this embodiment, the drive shaft lower bearing 34 is effectively utilized to implement the pressure alarm function by being limited in rotation around the drive shaft transverse rotation axis L4.

[0105] When the user turns on the electric toothbrush, the driving coil 42 passes an alternating current with a frequency of f0, and the left and right transducer permanent magnets 36 and 35 reciprocate around the longitudinal axis L1 of the driving shaft. The left and right transducer permanent magnets 36 and 35 drive the driving shaft 37 to reciprocate around the longitudinal axis L1 of the driving shaft, and the driving shaft 37 drives the cleaning element 21 on the cleaning assembly 2 to reciprocate around the longitudinal axis L1 of the driving shaft. When the cleaning element 21 is in an unloaded state, such as Figure 6As shown, the load force transmitted to the drive shaft 37 is zero, the longitudinal axis L1 of the drive shaft coincides with the longitudinal axis of the bearing 33 on the drive shaft, the drive shaft 37 is in the initial state, the spring 31 is in a pre-compressed state, and the preload force of the spring 31 pushes the lever 32 to rotate around the lever rotation axis L3, so that the protrusion 323 of the short lever arm is pressed against the bearing 33 on the drive shaft. The bearing 33 on the drive shaft is pressed against the lower fixed surface 76 of the lower bearing of the drive shaft by the force from the spring 31. The gap between the lever shielding surface 325 on the lever 32 and the photosensitive element 111 reaches the maximum, the light energy received by the photosensitive element 111 from the light emitting element 112 reaches the maximum, and the corresponding electrical parameters of the photosensitive element 111 (such as the resistance value) reach the minimum. When the user applies a load pressure F1 on the cleaning element 21, as shown in FIG. Figure 7 As shown, the load pressure F1 applied to the cleaning element 21 is transmitted to the drive shaft 37, and then to the bearing 33 on the drive shaft. The bearing 33 on the drive shaft transmits the force to the protrusion 323 of the short arm of the lever, forming a load force F2 on the protrusion of the short arm of the lever. Figure 7 and Figure 11 As shown, the product of the load force F2 borne by the protrusion 323 of the short lever arm and the length X1 of the short lever arm is the torque M2 of the short lever arm (not shown in the figure), and the product of the spring force F3 on the long lever arm and the length X2 of the long lever arm is the torque M3 of the long lever arm (not shown in the figure). When the load pressure F1 applied to the cleaning element 21 increases, when the torque M2 of the short lever arm is greater than the torque M3 of the long lever arm, the lever 32 rotates clockwise around the lever rotation axis L3, and the protruding bottom plane 326 of the long lever arm pushes the spring 31 to further compress, and the longitudinal axis L1 of the drive shaft is tilted relative to the longitudinal axis of the drive shaft upper bearing 33. The load pressure F1 applied to the cleaning element 21 pushes the drive shaft lower bearing 34 to disengage from the lower fixed surface 76 of the drive shaft lower bearing, causing the drive shaft lower bearing 34 to move toward the upper fixed surface 73 of the drive shaft lower bearing, as shown in FIG. Figure 12 and Figure 11 As shown, the gap between the lever shielding surface 325 on the lever 32 and the photosensitive element 111 becomes smaller, the light energy received by the photosensitive element 111 from the light-emitting element 112 becomes smaller, and the corresponding electrical parameters of the photosensitive element 111 (such as the resistance value) become larger. When the load pressure F1 applied to the cleaning element 21 further increases, the drive shaft lower bearing 34 contacts the drive shaft lower bearing upper fixed surface 73, and the drive shaft lower bearing upper fixed surface 73 restricts the drive shaft lower bearing 34 from further rotation. The load force F2 on the protrusion of the lever short arm reaches a maximum value, the torque M2 of the lever short arm reaches a maximum value, the gap between the lever shielding surface 325 on the lever 32 and the photosensitive element 111 reaches a minimum value, the light energy received by the photosensitive element 111 from the light-emitting element 112 reaches a minimum value, and the corresponding electrical parameters of the photosensitive element 111 (such as the resistance value) reach a maximum value.

[0106] The load pressure F1 applied to the cleaning element 21 causes the transducer elastic member 38 to form an elastic member load deformation. The greater the load pressure F1, the greater the elastic member load deformation. Excessive elastic member load deformation will exacerbate fatigue aging of the transducer elastic member 38, causing fatigue fracture of the transducer elastic member 38 in a short period of time, thereby causing the electric cleaning and care device to fail. Furthermore, during the tooth cleaning process, applying excessive load pressure F1 to the cleaning element 21 can also damage the gums. In this embodiment, as described above, the drive shaft 37 is fastened with an upper drive shaft bearing 33 and a lower drive shaft bearing 34. The upper drive shaft bearing 33 is fixed in the left and right transducer brackets 5 and 7, preventing relative movement between the upper drive shaft bearing 33 and the left and right transducer brackets 5 and 7. Although the lower drive shaft bearing 34 is also fixed in the left and right transducer brackets 5 and 7, it can move to a limited extent relative to the left and right transducer brackets 5 and 7. Because the drive shaft lower bearing 34 cannot simultaneously contact both the drive shaft lower bearing upper fixed surface 73 and the drive shaft lower bearing lower fixed surface 76, the drive shaft lower bearing upper fixed surface 73 and the drive shaft lower bearing lower fixed surface 76 constrain the drive shaft lower bearing 34 to limited rotation about the drive shaft transverse rotation axis L4. When the drive shaft lower bearing 34 contacts the drive shaft lower bearing upper fixed surface 73, the maximum counterclockwise rotation angle of the drive shaft lower bearing 34 and the drive shaft 37 about the drive shaft transverse rotation axis L4 is achieved. This maximum angle is the drive shaft rotation limit angle. As described above, in the present invention, the maximum drive shaft rotation limit angle is 2 degrees, preferably 1.5 degrees, and more preferably 1 degree.

[0107] The drive shaft lower bearing 34 supports the protrusion 323 of the short lever arm. The raised bottom surface 326 of the long lever arm bears the pressure of the spring 31. The left and right lever rotation axes 321 and 322 cooperate with the lever fixing holes 71 arranged on the left and right transducer brackets 5 and 7, allowing the lever 32 to rotate only about the lever rotation axis L3. The load pressure F1 applied to the cleaning element 21 causes the drive shaft lower bearing 34 to rotate counterclockwise about the drive shaft transverse rotation axis L4. The drive shaft lower bearing 34 pushes the protrusion 323 of the short lever arm, causing the lever 32 to rotate clockwise about the lever rotation axis L3. The gap between the lever shielding surface 325 on the lever 32 and the photosensitive element 111 decreases, and the corresponding electrical parameters (such as resistance) of the photosensitive element 111 increase. The microcontroller unit MCU on the circuit board 11 detects changes in the corresponding electrical parameters (such as resistance) of the photosensitive element 111 to detect the magnitude of the load pressure F1 on the cleaning element 21. When the load pressure F1 applied to the cleaning element 21 reaches or exceeds a set threshold, the handle 1 can alert the user of the excessive load pressure F1 on the cleaning element 21 through sound, light, vibration, or other means, or directly slow down or shut down the electric toothbrush, thereby effectively protecting the user's gums. In the above embodiment, the ratio of the length X2 of the long lever arm of the lever 32 to the length X1 of the short lever arm can amplify the corresponding relationship between the load pressure F1 applied to the cleaning element 21 and the displacement of the lower drive shaft bearing 34, thereby increasing the gap between the lever shielding surface 325 on the lever 32 and the photosensitive element 111, thereby increasing the change in the value of the electrical parameter (such as resistance) corresponding to the photosensitive element 111, thereby greatly improving the accuracy of detecting the rotation of the lower drive shaft bearing 34 on the drive shaft 37 about the lever rotation axis L3 based on the load pressure F1 on the cleaning element 21. In this embodiment, the ratio of the length X2 of the long lever arm to the length X1 of the short lever arm is in the range of 1.5-5, preferably 2-4.

[0108] Obviously, the geometric relationship between the photosensitive element 111, the light emitting element 112 and the lever 32 is not limited to the above embodiment. Figure 15 、 Figure 16 As shown, a light-shielding protrusion 327 is provided on lever 32. Light-shielding protrusion 327 extends from lever 32 toward circuit board 11 and is positioned between photosensor 111 and light-emitting element 112. Light-shielding protrusion 327 can block light from light-emitting element 112 from being received by photosensitive element 111. The detailed analysis is the same as that of the previous embodiment and will not be repeated here. Obviously, in the above two embodiments, the positions of photosensor 111 and light-emitting element 112 on circuit board 11 can be interchanged, and the objectives of the present invention can still be achieved, and the same technical effects can be achieved.

[0109] In the present invention, a light-shielding surface 325 and / or a light-shielding protrusion 327 are provided on the lever 32, and a light-emitting element 112 and a photosensitive element 111 are provided on the circuit board. Under the action of the load pressure F1 applied to the cleaning element 21, the lower bearing 34 of the drive shaft drives the protrusion 323 of the short lever arm, causing the lever 32 to rotate about the lever rotation axis L3. The rotation of the lever 32 causes the distance between the light-shielding surface 325 and / or the light-shielding protrusion 327 and the photosensitive element 111 and / or the light-emitting element 112 to change. The light-shielding surface 325 and / or the light-shielding protrusion 327 can prevent the photosensitive element 111 from receiving light energy from the light-emitting element 112. The rotation of the lever 32 causes the electrical parameters (such as the resistance value) of the photosensitive element 111 to change. The MCU on the circuit board 11 detects the change in the electrical parameters (such as the resistance value) of the photosensitive element 111, thereby enabling the MCU on the circuit board 11 to detect the load pressure F1 applied to the cleaning element 21. When the load pressure F1 applied to the cleaning element 21 is equal to or exceeds a set threshold, the handle 1 will issue an alarm for excessive pressure through sound, light, vibration, shutdown, etc.

[0110] It is worth emphasizing that although the present invention and the applicant's other Chinese invention patent application (application publication number 201711125025.4) both adopt the principle of photosensitive pressure alarm, the present invention is a pressure alarm device specifically for acoustic wave electric cleaning and care appliances. In the present invention, the internal clearance of the bearing on the drive shaft is utilized, and the drive shaft can be tilted relative to the bearing on the drive shaft, and the left and right transducer transmission arms are tilted relative to the longitudinal axis of the bearing on the drive shaft, and the left and right transducer elastic members are tilted relative to the longitudinal axis of the bearing on the drive shaft, and the fixing parts of the bearing on the drive shaft and the transducer elastic member are stationary relative to the left and right brackets of the transducer, so that the left and right transducer elastic members are deformed relative to the fixing parts of the transducer elastic member, that is, the load pressure F1 applied to the cleaning element will cause the left and right transducer elastic members to undergo elastic member load deformation, and the deformation of the left and right transducer elastic members under the drive of the left and right transducer permanent magnets is called elastic member drive deformation. By setting the upper fixed surface of the lower bearing of the drive shaft and the lower fixed surface of the lower bearing of the drive shaft to determine the limited rotation angle of the drive shaft, the load deformation of the elastic member is effectively controlled, thereby effectively reducing or eliminating the impact of the load deformation of the elastic member on the life of the transducer. At the same time, the pressure alarm function is effectively implemented by effectively utilizing the limited rotation of the lower bearing of the drive shaft around the transverse rotation axis L4 of the drive shaft. In addition, in the present invention, a lever structure is provided, and the lever and the transducer are connected, and the lever and the drive coil assembly are in a non-contact relationship. This not only effectively utilizes the limited rotation of the lower bearing of the drive shaft around the transverse rotation axis L4 of the drive shaft to implement the pressure alarm function, but also adopts a lever amplification displacement structure, which greatly improves the accuracy of detecting the load pressure F1 on the cleaning element, thereby improving the sensitivity of the pressure alarm device.

[0111] In the invention patent application with publication number 201711125025.4, the light source and the photosensitive unit are respectively arranged on a movable part movable relative to the handle housing or a stationary part stationary relative to the handle housing and are on the same side. The light reflecting surface is arranged on the stationary part or the movable part facing the light source and the photosensitive unit, roughly facing the light source and the photosensitive unit. Under the combined action of the external force F1 applied to the cleaning element in a direction approximately along or parallel to the axis of the cleaning element along the length direction and the elastic force F2 of the elastic part generated by the elastic part built into the handle to resist the external force F1, the light source and the photosensitive unit or the light reflecting surface arranged on the movable part movable relative to the handle housing move with the movable part, and the incident angle and reflection angle of the light emitted by the light source on the light reflecting surface change, so that the light receiving area of the photosensitive unit that can receive the light from the light source changes, thereby causing the electrical performance of the photosensitive unit to change. Comparing the two patents and applications, it can be seen that the two have different structures and technical solutions. Although the invention patent application No. 201711125025.4 has the same structure as the photosensitive unit, the light reflecting surface has the same structure as the photosensitive unit. Figure 13-15 The application of the technical solution disclosed in this application to an acoustic wave electric cleaning and care appliance is shown. However, this technical solution is more suitable for electric cleaning and care appliances whose drive assembly includes a micromotor and whose cleaning element and cleaning element carrier perform reciprocating linear motion or reciprocating rotational motion. This is because the DC micromotor can generate large displacement in response to the load force on the cleaning element, and the overall movement of the DC micromotor does not affect the motor's power output. In contrast, for acoustic wave electric cleaning and care appliances, the cleaning element cannot generate large displacement of the transducer under the action of the load force, otherwise the transducer's lifespan will be greatly shortened.

Claims

1. An acoustic wave electric cleaning and care device, comprising a handle having a handle housing (13) and a handle rear housing (9), wherein the handle housing (13) contains a power supply (10), a circuit board (11), a transducer (3), a drive coil assembly (4), and a cleaning assembly (2) including a cleaning element carrier and a cleaning element (21), wherein the transducer (3) comprises: A drive shaft (37) inserted into the cleaning component (2), left and right transducer brackets (5, 7), at least two transducer permanent magnets (36, 35) respectively arranged on the left and right sides of the longitudinal axis (L1) of the drive shaft, corresponding permanent magnet brackets, left and right transducer transmission arms fixedly connected to the permanent magnet brackets and fixedly connected to the drive shaft (37), at least two transducer elastic members (38) respectively arranged on the left and right sides of the longitudinal axis (L1) of the drive shaft, and at least one transducer elastic member fastened to the left and right transducer brackets (5, 7). The fixing member (39) of the transducer elastic member (38) is fixedly connected to the fixing member (39) of the transducer elastic member, and the other end of the transducer elastic member (38) is fixedly connected to the corresponding transducer transmission arm. The left and right permanent magnets (36, 35) are independent of each other. The magnetic pole polarity of the permanent magnet on one side in the direction toward the driving coil is opposite to the magnetic pole polarity of the permanent magnet on the other side in the direction toward the driving coil. The left and right permanent magnets (36, 35) can move relative to the fixing member (39) of the transducer elastic member. The invention is characterized in that a drive shaft upper bearing (33) and a drive shaft lower bearing (34) are respectively fixed on the drive shaft (37); the drive shaft upper bearing (33) is fixed in the transducer bracket (5, 7) through the drive shaft upper bearing fixing surface (75) located on the left and right transducer brackets (5, 7) and cannot move relative to the drive shaft upper bearing fixing surface (75); the drive shaft lower bearing (34) and the drive shaft lower bearing upper fixing surface (73) and the drive shaft lower bearing lower fixing surface (76) are associated with each other; the drive shaft lower bearing (34) is fixed to the transducer bracket (5, 7) through the drive shaft lower bearing upper fixing surface (73) located on the left and right transducer brackets (5, 7) The drive shaft lower bearing (34) can move relative to the fixed surface (73) or the fixed surface (76) of the drive shaft lower bearing to achieve separation or contact between the drive shaft lower bearing (34) and the fixed surface (73) of the drive shaft lower bearing on the left and right brackets (5, 7) of the transducer; the cleaning and care device also includes a photosensitive pressure alarm device, which includes a lever (32) installed on the left and right brackets (5, 7) of the transducer, a light-emitting element (112) provided on the circuit board (11) and adjacent to the lever (32), and a photosensitive element (111) provided on the circuit board (11) and adjacent to the lever (32), wherein the lever (32) A lever shielding surface (325) and / or a light shielding protrusion (327) are arranged in the direction toward the circuit board (11), and the left and right sides of the lever (32) are respectively provided with left and right lever rotation axes (321, 322), and the lever (32) is provided with a protrusion (323) of a lever short arm in a direction away from the lever rotation axis (L3) and close to the cleaning component (2) and in a direction toward the lower bearing (34) of the drive shaft, and the lower bearing (34) of the drive shaft supports the protrusion (323) of the lever short arm, and is provided with a protrusion (324) of a lever long arm in a direction away from the lever rotation axis (L3) and close to the handle rear shell (9) and in a direction toward the lower bearing (34) of the drive shaft. ), a spring (31) surrounds the outside of the lever long arm protrusion (324), the bottom plane (326) of the lever long arm protrusion supports one end of the spring (31), and the bottom plane (77) of the spring bearing hole arranged on the left and right brackets (5, 7) of the transducer supports the other end of the spring (31), and the gap between the lever shielding surface (325) and / or the shading protrusion (327) and the photosensitive element (111) changes, causing the light energy emitted by the light-emitting element (112) and passing through the gap to reach the photosensitive element (111) to change, detecting the change of the corresponding electrical performance parameters of the photosensitive element (111), thereby obtaining the load pressure (F1) applied to the cleaning element (21).

2. The sonic electric cleaning and care appliance according to claim 1, characterized in that: The upper fixed surface (73) of the drive shaft lower bearing and the lower fixed surface (76) of the drive shaft lower bearing constrain the drive shaft lower bearing (34) to perform limited rotation only around the drive shaft transverse rotation axis (L4), that is, the drive shaft lower bearing (34) cannot contact the upper fixed surface (73) of the drive shaft lower bearing and the lower fixed surface (76) of the drive shaft lower bearing at the same time.

3. The sonic electric cleaning and care appliance according to claim 2, characterized in that: When the drive shaft lower bearing (34) contacts the upper fixed surface (73) of the drive shaft lower bearing, the drive shaft lower bearing (34) and the drive shaft (37) rotate counterclockwise around the drive shaft transverse rotation axis (L4) to a maximum angle, and the maximum angle is the limited angle of rotation of the drive shaft.

4. The sonic electric cleaning and care appliance according to claim 3, characterized in that: The driving shaft has a limited rotation angle of 0-≤2 degrees.

5. The sonic electric cleaning and care appliance according to claim 4, characterized in that: The driving shaft has a limited rotation angle of 0-≤1.5 degrees.

6. The sonic electric cleaning and care appliance according to claim 5, characterized in that: The driving shaft has a limited rotation angle of 1 degree.

7. The sonic electric cleaning and care appliance according to claim 1, characterized in that: The left and right lever rotation shafts (321, 322) have the same lever rotation axis (L3).

8. The sonic electric cleaning and care appliance according to claim 1, characterized in that: The length of the long arm of the lever (32) is X2, the length of the short arm of the lever is X1, and the ratio of X2 to X1 is in the range of 1.5-5.

9. The sonic electric cleaning and care appliance according to claim 8, characterized in that: The ratio of X2 to X1 ranges from 2 to 4.

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