Elastic actuator and electric shaver and electric toothbrush based on elastic actuator

Abstract

The utility model relates to an elastic actuator and an electric shaver and an electric toothbrush based on the elastic actuator, and the elastic actuator comprises a bracket which comprises an upper bracket part and a lower bracket part which are oppositely arranged; the permanent magnet assembly comprises a permanent magnet fixed on the upper part of the bracket; the electromagnetic assembly comprises an electromagnetic coil and a silicon steel sheet group which can alternately generate different polarities when being electrified, the electromagnetic assembly is fixed at the lower part of the bracket and is arranged opposite to the permanent magnet assembly, and the electromagnetic assembly attracts or repels a permanent magnet through the generated polarities, so that the upper part of the bracket can be driven to do left-right reciprocating motion relative to the lower part of the bracket; and the hardware elastic sheet is at least partially supported and connected to the left and right sides of the upper and lower parts of the bracket to provide resilience force for the left-right reciprocating motion of the upper part of the bracket relative to the lower part of the bracket. According to the utility model, the permanent magnet assembly and the electromagnetic assembly are matched with each other, so that the bracket upper part reciprocates at a constant amplitude relative to the bracket lower part, the frequency and the duty ratio can be flexibly adjusted, and the rotating speed and the amplitude can be better controlled.

Description

Technical Field

[0001] The utility model relates to the field of reciprocating linear actuators, in particular to an elastic actuator and an electric shaver and an electric toothbrush based on the elastic actuator. Background Art

[0002] As is known to all, a reciprocating linear actuator is an actuator that can output in a linear oscillating manner. In order to ensure reliable stability to meet the high-frequency motion requirements, the actuators in the prior art are generally complex in design, large in size, heavy, and have high production costs. Therefore, the actuators in the prior art are difficult to meet the requirements of small size for electric shavers and electric toothbrushes. Utility Model Content

[0003] In order to solve the problems existing in the above-mentioned traditional actuators, the utility model provides an elastic actuator to reduce cost, size, weight and improve the reciprocating performance of the assembled actuator, and provides an electric shaver or electric toothbrush using the low-cost, miniaturized and lightweight actuator.

[0004] To achieve the above objectives, on the one hand, the utility model provides an elastic actuator, which includes:

[0005] The bracket comprises an upper bracket portion and a lower bracket portion which are arranged opposite to each other, and the upper bracket portion can reciprocate left and right relative to the lower bracket portion;

[0006] A permanent magnet assembly, comprising at least one permanent magnet fixedly connected to the upper portion of the bracket, wherein the N and S poles of the permanent magnet are arranged in a left-right distribution;

[0007] An electromagnetic assembly, comprising an electromagnetic coil capable of alternately generating different polarities when energized and a silicon steel sheet assembly mounted and matched with the electromagnetic coil, wherein the electromagnetic assembly is fixed to the lower portion of the bracket and arranged opposite to the permanent magnet assembly, and the electromagnetic assembly attracts or repels the permanent magnet by generating polarity, thereby driving the upper portion of the bracket to reciprocate left and right relative to the lower portion of the bracket; and

[0008] The metal spring piece is at least partially supported and connected to the upper part of the bracket and the left and right sides of the lower part of the bracket to provide a rebound force for the upper part of the bracket to reciprocate left and right relative to the lower part of the bracket.

[0009] As a further preferred technical solution of the utility model, the bottom surface of the upper part of the bracket is provided with a slot, and the permanent magnet assembly is fixed to the upper part of the bracket through the slot. Further, the permanent magnet assembly also includes an iron sheet, and the iron sheet is superimposed on the upper part of the permanent magnet.

[0010] As a further preferred technical solution of the utility model, the silicon steel sheet group is composed of N "E"-shaped silicon steel sheets stacked together, and the convex column located in the middle of the "E"-shaped silicon steel sheet is provided with a strip-shaped pit.

[0011] As a further preferred technical solution of the present utility model, the top of the upper part of the bracket is connected to a driving shaft through a driving block.

[0012] As a further preferred technical solution of the present utility model, the upper part of the bracket and the lower part of the bracket are independent components, and the upper and lower ends of the hardware spring piece are respectively clamped and fixed to the upper part of the bracket and the lower part of the bracket; or, the upper part of the bracket and the left and right sides of the lower part of the bracket are connected by a thin supporting wall of an integral structure, and the hardware spring piece is fixed to the upper part of the bracket and the lower part of the bracket by screws.

[0013] As a further preferred technical solution of the utility model, there are two brackets, which are arranged in parallel front and back and each is provided with a corresponding hardware spring piece, each bracket corresponds to one permanent magnet component, and the two brackets share one electromagnetic component.

[0014] As a further preferred technical solution of the present utility model, the metal spring pieces arranged on the two brackets are integrally connected between the lower parts of the two brackets.

[0015] As a further preferred technical solution of the present invention, the permanent magnets of the two permanent magnet assemblies are arranged in parallel with the same polarity.

[0016] According to another aspect of the utility model, the utility model further provides an electric toothbrush, which comprises a toothbrush head and an elastic actuator, wherein the toothbrush head is driven by the elastic actuator to perform reciprocating motion.

[0017] According to another aspect of the utility model, the utility model further provides an electric razor, which comprises a blade and an elastic actuator, wherein the blade is driven by the elastic actuator to perform reciprocating motion.

[0018] Compared with the prior art, the elastic actuator of the utility model and the electric shaver and electric toothbrush based on the elastic actuator can achieve the following beneficial effects:

[0019] 1) The utility model sets a permanent magnet component and an electromagnetic component to cooperate with each other, so that the upper part of the bracket reciprocates with a constant amplitude relative to the lower part of the bracket, and the frequency and duty cycle can be flexibly adjusted to better control the speed and amplitude;

[0020] 2) The utility model supports and connects the upper part and the lower part of the bracket by means of metal springs arranged on the left and right sides of the bracket, so that when the upper part of the bracket reciprocates relative to the lower part of the bracket, the metal springs can provide a rebound force for the upper part of the bracket to reciprocate relative to the lower part of the bracket, thereby ensuring that the reciprocating motion can be carried out smoothly and reliably;

[0021] 3) The utility model supports and connects the upper part and the lower part of the bracket by means of metal spring sheets arranged on the left and right sides of the bracket, and uses the spring sheets to increase the elastic force, which can effectively solve the problem of insufficient rigidity caused by relying only on thin supporting walls during high-frequency left and right oscillation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] Figure 1 is a schematic structural diagram of the elastic actuator of Example 1;

[0024] Figure 2 It is a structural schematic diagram of a silicon steel sheet group;

[0025] Figure 3 is a schematic structural diagram of the elastic actuator of Example 2;

[0026] Figure 4 is a schematic structural diagram of the elastic actuator of Example 3;

[0027] Figure 5 This is a schematic structural diagram of the elastic actuator of Example 4.

[0028] In the figure: 1, driving shaft, 2, driving block, 3, bracket, 31, upper part of bracket, 32, lower part of bracket, 33, thin supporting wall, 34, slot, 4, hardware spring, 5, permanent magnet assembly, 51, iron sheet, 52, permanent magnet, 6, electromagnetic assembly, 61, electromagnetic coil, 62, silicon steel sheet group, 621, pit.

[0029] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods. The terms such as "upper", "lower", "left", "right", "middle" and "one" used in the preferred embodiments are only used to facilitate the description, and are not used to limit the scope of the implementation of the present invention. The changes or adjustments in their relative relationships shall also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0031] Embodiment 1:

[0032] like Figure 1 As shown, the utility model provides an elastic actuator with a single drive structure, which specifically includes a bracket 3, a permanent magnet component 5, an electromagnetic component 6 and a drive shaft 1.

[0033] The bracket 3 comprises an upper bracket portion 31 and a lower bracket portion 32 which are arranged opposite to each other. The upper bracket portion 31 is connected to the left and right sides of the lower bracket portion 32 via a thin supporting wall 33 of an integral structure, and the upper bracket portion 31 can reciprocate left and right relative to the lower bracket portion 32 .

[0034] The permanent magnet assembly 5 is fixed to the lower part of the bracket upper part 31 through the slot 34, and includes a permanent magnet 52 and an iron sheet 51 superimposed on the top of the permanent magnet 52, and the N and S poles of the permanent magnet 52 are arranged on the left and right;

[0035] The electromagnetic assembly 6 includes an electromagnetic coil 61 that can alternately generate different polarities when energized. The electromagnetic coil 61 is wound on the coil support 3 and installed in a silicon steel sheet group 62, which is composed of a plurality of "E"-shaped silicon steel sheets stacked together. The electromagnetic assembly 6 is fixed to the lower portion 32 of the support and arranged opposite to the permanent magnet assembly 5. The electromagnetic assembly 6 attracts or repels the permanent magnet 52 through the generated polarity, thereby driving the upper portion 31 of the support to reciprocate left and right relative to the lower portion 32 of the support.

[0036] In order to make the upper part 31 of the bracket reciprocate left and right relative to the lower part 32 of the bracket, after the electromagnetic coil 61 changes polarity, the upper part 31 of the bracket can quickly respond to move in the opposite direction and maintain sufficient kinetic energy. To this end, the left and right sides of the bracket 3 are supported and connected by two symmetrically distributed hardware springs 4 to support the upper part 31 of the bracket and the lower part 32 of the bracket, and the hardware springs 4 provide the resilience for the left and right reciprocating motion. The upper and lower ends of the hardware springs 4 are reliably connected to the upper part 31 of the bracket and the lower part 32 of the bracket by screws to ensure that they will not loosen during the reciprocating motion. Since the thin support wall 33 is also elastic, it can also assist the hardware spring 4 in providing a certain restoring elastic force. The bracket 3 is usually an injection molded part, and the elastic force of the thin support wall 33 is limited. It is difficult to meet the high-frequency reciprocating motion requirements if the resilience is only provided by the thin support wall 33 without the hardware spring 4.

[0037] The specific working principle of this embodiment is as follows:

[0038] When a pulse signal is input to the electromagnetic coil 61, the electromagnetic coil 61 generates a magnetic field that interacts with the permanent magnet 52, pushing the permanent magnet 52 to move linearly left and right, thereby driving the upper part 31 of the bracket and the lower part 32 of the bracket to reciprocate left and right, and at the same time causing the left and right metal spring pieces 4 to deform. Under the reaction force of the left and right metal spring pieces 4, the permanent magnet 52 quickly returns to its original position. The control pulse signal can control the frequency of the linear reciprocating motion of the permanent magnet 52.

[0039] In this embodiment, a drive shaft 1 is used to output the power generated by the left-right reciprocating motion, and the drive shaft 1 is connected to the top of the upper part 31 of the bracket through a drive block 2. When the elastic actuator is applied to an electric shaver, the blade (not shown in the drawings) is driven and attached to the drive shaft 1, and when the drive shaft 1 moves back and forth with the upper part 31 of the bracket relative to the lower part 32 of the bracket, the blade can be driven to move back and forth. When the elastic actuator is applied to an electric toothbrush, the toothbrush head (not shown in the drawings) is driven and attached to the drive shaft 1, and when the drive shaft 1 moves back and forth with the upper part 31 of the bracket relative to the lower part 32 of the bracket, the toothbrush head can be driven to move back and forth.

[0040] Furthermore, a strip-shaped pit 621 is provided in the middle of the silicon steel sheet group 62 along the overlapping direction of the silicon steel sheets. Since the permanent magnet 52 has N / S poles magnetized on one plane, the permanent magnet 52 can reduce the magnetic field repulsion at the intersection of two opposite poles and increase the thrust under the action of the pit 621 provided in the middle of the silicon steel sheet (also called E sheet).

[0041] Embodiment 2:

[0042] This embodiment provides an elastic actuator with a dual-drive structure, which differs from Embodiment 1 in that: the bracket 3, the permanent magnet assembly 5 and the drive shaft 1 each have two sets, each set of the bracket 3, the permanent magnet assembly 5 and the drive shaft 1 constitutes a drive unit, and the two drive units share one electromagnetic assembly 6.

[0043] When a pulse signal is input to the electromagnetic coil 61, the electromagnetic coil 61 simultaneously generates a magnetic field that interacts with the permanent magnets 52 of the two permanent magnet assemblies 5, pushing the two permanent magnets 52 to move linearly left and right, thereby driving the corresponding upper bracket 31 and lower bracket 32 ​​to reciprocate left and right, thereby driving the two sets of drive shafts 1 to move, and realizing two sets of drive outputs. When the elastic actuator is applied to an electric shaver, it can drive two sets of blades to reciprocate.

[0044] In a specific embodiment, when the permanent magnets 52 of the two permanent magnet assemblies 5 are arranged in parallel with the same poles, when the elastic actuator is applied to an electric shaver, it can drive two sets of blades to move synchronously back and forth.

[0045] In another specific embodiment, the metal spring pieces 4 disposed on the two brackets 3 and located on the same side are integrally connected between the two bracket lower portions 32 so that the metal spring pieces 4 maintain consistency and stability and are easy to install.

[0046] Embodiment 3:

[0047] This embodiment provides an elastic actuator with a dual-drive structure, which is different from the embodiment 2 only in that the metal spring pieces 4 on the same bracket 3 are connected as a whole. Specifically, the middle part of the metal spring piece 4 is attached to the top of the bracket upper part 31 and is fixed to the bracket upper part 31 with screws after being pressed by the driving block 2, and the left and right ends of the metal spring piece 4 are respectively bent downward along the left and right ends of the bracket upper part 31 and fixed to the left and right ends of the bracket lower part 32 with screws. This makes assembly convenient and the stability is better while ensuring the resilience.

[0048] Embodiment 4:

[0049] This embodiment provides an elastic actuator with a dual-drive structure, which differs from the second embodiment only in that: the upper part 31 of the bracket and the left and right sides of the lower part 32 of the bracket are not connected by a thin support wall 33 of an integral structure, so that the upper part 31 of the bracket and the lower part 32 of the bracket are independent components, and at the same time, the upper and lower ends of the metal spring 4 are reliably connected to the upper part 31 of the bracket and the lower part 32 of the bracket, and ensure that they will not loosen during the reciprocating motion. Specifically, this clamping method can embed the metal spring 4 into the upper part 31 of the bracket and the lower part 32 of the bracket during injection molding of the bracket 3, without the need for screw installation, saving assembly time and improving assembly efficiency. At the same time, it can prevent the consistency problem of the left and right metal springs 4 caused by assembly errors, and ensure that the rebound force on both sides remains consistent.

[0050] Although specific embodiments of the present invention are described above, those skilled in the art should understand that these are merely examples and that various changes or modifications may be made to the embodiments without departing from the principles and essence of the present invention. The scope of protection of the present invention is limited only by the appended claims.

Claims

1. An elastic actuator, characterized in that: include: The bracket comprises an upper bracket portion and a lower bracket portion which are arranged opposite to each other, and the upper bracket portion can reciprocate left and right relative to the lower bracket portion; A permanent magnet assembly, comprising at least one permanent magnet fixedly connected to the upper portion of the bracket, wherein the N pole and the S pole of the permanent magnet are arranged in a left-right distribution; An electromagnetic assembly, comprising an electromagnetic coil capable of alternately generating different polarities when energized and a silicon steel sheet assembly mounted and matched with the electromagnetic coil, wherein the electromagnetic assembly is fixed to the lower portion of the bracket and arranged opposite to the permanent magnet assembly, and the electromagnetic assembly attracts or repels the permanent magnet by generating polarity, thereby driving the upper portion of the bracket to reciprocate left and right relative to the lower portion of the bracket; and The metal spring piece is at least partially supported and connected to the upper part of the bracket and the left and right sides of the lower part of the bracket to provide a rebound force for the upper part of the bracket to reciprocate left and right relative to the lower part of the bracket.

2. The elastic actuator according to claim 1, characterized in that: A slot is provided on the bottom surface of the upper part of the bracket, and the permanent magnet assembly is fixed to the upper part of the bracket through the slot.

3. The elastic actuator according to claim 1, characterized in that: The silicon steel sheet group is composed of N "E"-shaped silicon steel sheets stacked together, and a strip-shaped pit is provided on the convex column located in the middle of the "E"-shaped silicon steel sheet.

4. The elastic actuator according to claim 1, characterized in that: The top of the upper part of the bracket is connected with a driving shaft through a driving block.

5. The elastic actuator according to any one of claims 1 to 4, characterized in that: The upper part of the bracket and the lower part of the bracket are independent components, and the upper and lower ends of the metal spring sheet are respectively clamped and fixed to the upper part of the bracket and the lower part of the bracket; or, the upper part of the bracket is connected to the left and right sides of the lower part of the bracket through a thin supporting wall of an integral structure, and the thin supporting wall is elastic, and the metal spring sheet is fixed to the upper part of the bracket and the lower part of the bracket by screws respectively.

6. The elastic actuator according to claim 5, characterized in that: There are two brackets, which are arranged in parallel front and back and each is provided with a corresponding metal spring piece, each bracket corresponds to one permanent magnet component, and the two brackets share one electromagnetic component.

7. The elastic actuator according to claim 6, characterized in that: The metal spring pieces arranged on the two brackets are integrally connected between the lower parts of the two brackets.

8. The elastic actuator according to claim 6, characterized in that: The permanent magnets of the two permanent magnet assemblies are arranged in parallel with the same poles.

9. An electric toothbrush, characterized in that: The toothbrush comprises a toothbrush head and the elastic actuator according to any one of claims 1 to 8, wherein the toothbrush head is driven by the elastic actuator to perform reciprocating motion.

10. An electric shaver, characterized in that: The invention comprises a blade and the elastic actuator according to any one of claims 1 to 8, wherein the blade is driven by the elastic actuator to perform reciprocating motion.

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