Linear actuating device and hair cutting device
By arranging electromagnets horizontally and setting up magnet groups on the sides, so that the magnet groups correspond to the magnetic poles of the electromagnets, the problem of low space utilization of linear actuators is solved, and a compact design and aesthetic effect of the device are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- RAYMOND (PANYU NANSHA) ELECTRICAL APPLIANCE DEV CO LTD
- Filing Date
- 2024-10-31
- Publication Date
- 2026-05-01
AI Technical Summary
Existing linear actuators have an increased length in the vertical direction due to the vertical arrangement of electromagnets in the stator assembly, which occupies more space and affects the product's appearance and space utilization.
The electromagnet is arranged horizontally, and the magnet assembly is placed to the side of the electromagnet corresponding to its magnetic poles. Through magnetic induction, the magnet assembly moves back and forth along the direction perpendicular to the central axis of the electromagnet, making full use of the lateral space and reducing the height of the device.
It effectively reduces the volume of the linear actuator, improves the proportional coordination of the product in the length and lateral directions, enhances the aesthetic appearance, shortens the length of the hair cutting device housing, and makes full use of the internal space.
Smart Images
Figure CN121966181A_ABST
Abstract
Description
A linear actuator and a hair cutting device Technical Field
[0001] This invention relates to the field of linear motor technology, and in particular to a linear actuator and a hair cutting device incorporating the linear actuator. Background Technology
[0002] A linear actuator is a device used to control linear displacement or force. It generates a magnetic field through electromagnetic induction, using this magnetic field to apply force or movement to a load, thus achieving linear control of the load. In existing linear actuator structures, because the electromagnets in the stator assembly are arranged vertically, to ensure smooth magnetic induction and to drive the load requiring linear motion smoothly, the magnet assembly in the mover assembly needs to be positioned at the top of the electromagnet. That is, the mover assembly is located above the stator assembly. In this case, only one magnetic pole of the electromagnet faces the magnet assembly in the mover assembly, while the other magnetic pole is in a useless state. The magnet assembly in the mover assembly is located above the top magnetic pole of the electromagnet. Through the magnetic induction between the magnet assembly and the corresponding magnetic pole of the electromagnet, the magnetic field... The body reciprocates and drives the load that needs to perform linear motion (such as the moving blade assembly in a hair cutting device) to reciprocate. However, the electromagnet itself has a certain height. When it is arranged vertically, it will increase the vertical length of the linear actuator. This results in products using this type of linear actuator needing more installation space in the vertical direction. The increased length leads to lower space utilization in the horizontal direction. Furthermore, due to its longer length (which can also be understood as the length direction), the product's appearance is not in harmony with the proportions in the length and horizontal directions, resulting in an unattractive overall appearance. Summary of the Invention
[0003] The present invention aims to solve the technical problems existing in the prior art, and provides a linear actuation device that can improve space utilization, thereby reducing the size of the linear actuation device, making reasonable use of lateral space, and improving the aesthetics of the linear actuation device. In addition, the present invention also provides a hair cutting device having the aforementioned linear actuation device.
[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solutions:
[0005] The linear actuation device of the present invention includes a mounting frame, the mounting frame including an electromagnet mounting part and a magnet assembly mounting part, the magnet assembly mounting part being located to the side of the electromagnet mounting part, an electromagnet being horizontally arranged in the electromagnet mounting part, and a magnet assembly being arranged in the magnet assembly mounting part, wherein after the magnet assembly is installed in the magnet assembly mounting part, its magnetic pole is opposite to one end of the electromagnet installed in the electromagnet mounting part.
[0006] This invention discloses a linear actuation device. By setting up a mounting frame, an electromagnet is horizontally arranged within an electromagnet mounting section, and a magnet assembly is placed within a magnet assembly mounting section. This aligns the magnetic poles of the magnet assembly with those of the horizontally arranged electromagnet. When alternating current is applied to the electromagnet, the magnetic induction between the electromagnet and the magnet assembly causes the magnet assembly to reciprocate along the central axis perpendicular to the electromagnet. By arranging the electromagnet horizontally and placing the magnet assembly to the side of the electromagnet and opposite its magnetic poles, lateral space is fully utilized, significantly reducing the height of the linear actuation device. This results in a shorter product length, improving the proportions in both the length and lateral directions and enhancing the product's aesthetic appeal.
[0007] Furthermore, there are two magnet assembly mounting parts, which are respectively located on both sides of the electromagnet mounting part. Each magnet assembly mounting part is equipped with a magnet assembly, and each magnet assembly is opposite to one end of the electromagnet installed in the electromagnet mounting part.
[0008] Furthermore, the magnet assembly mounting part is elastically connected to the electromagnet mounting part through an elastic connecting part; the elastic connecting part and the electromagnet mounting part are integrally formed or detachably connected by fasteners.
[0009] Furthermore, connecting walls are provided on both sides of the electromagnet mounting part, and a first extension is provided on the connecting wall. A second extension is provided on both sides of the magnet assembly mounting part. The first extension and the second extension on the same side extend in the same direction and are connected to each other by an elastic connecting part.
[0010] Furthermore, the elastic connection portion includes at least one first elastic support portion.
[0011] Furthermore, the elastic connection portion also includes a second elastic support portion. There are two first elastic support portions, and the second elastic support portion is located between the two first elastic support portions. The thickness of the second elastic support portion is greater than the thickness of the first elastic support portions on both sides of it.
[0012] Furthermore, the elastic connection portion includes two first elastic support portions, and the elastic connection portion also includes a second elastic support portion, the second elastic support portion being located between the two first elastic support portions;
[0013] The portion of the first extension located between the first elastic support portion and the second elastic support portion, and the portion located between the first elastic support portion and the connecting wall, are configured as arc-shaped.
[0014] The portion of the second extension located between the first elastic support portion and the second elastic support portion, and the portion located between the first elastic support portion and the magnet assembly mounting portion, are configured as arc-shaped.
[0015] Furthermore, a drive arm is connected to the magnet assembly mounting part, and an output shaft is provided on the drive arm, the output shaft being located above the mounting frame.
[0016] Furthermore, a positioning hole is provided on the drive arm, and a positioning protrusion is provided on the magnet assembly mounting part. When the drive arm is connected to the magnet assembly mounting part, the positioning protrusion is inserted into the positioning hole to position the drive arm.
[0017] Alternatively, the drive arm and the magnet assembly mounting part are integrally formed.
[0018] Furthermore, there are two drive arms, which are respectively mounted on the magnet assembly on both sides, and the free ends of the two drive arms are staggered or opposite to each other.
[0019] The hair cutting device of the present invention includes a housing and at least one moving blade assembly. The aforementioned linear actuation device is disposed inside the housing. The moving blade assembly is connected to a magnet assembly mounting part. The moving blade assembly reciprocates with the magnet assembly under the power provided by the magnet assembly of the linear actuation device.
[0020] The hair cutting device of the present invention, having the aforementioned linear actuation device, can shorten the length (or height) of the hair cutting device housing, fully utilize the lateral space inside the housing, and improve the aesthetics of the hair cutting device. Furthermore, the hair cutting device, having the aforementioned linear actuation device, also possesses all the beneficial technical effects it brings, which will not be elaborated upon here. Attached Figure Description
[0021] The above and other objects, features, and advantages of the invention will become clearer through a more detailed description of the preferred embodiments illustrated in the accompanying drawings. The same reference numerals denote the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of the invention.
[0022] Figure 1 is a perspective view of one embodiment of the linear actuation device of the present invention.
[0023] Figure 2 is a schematic diagram of the decomposition of Figure 1.
[0024] Figure 3 is a schematic diagram of the structure of two electromagnets.
[0025] Figure 4 is a schematic diagram of the magnet assembly structure.
[0026] Figure 5 is a schematic diagram of the reciprocating linear motion of the magnet assembly relative to the electromagnet (Example 1).
[0027] Figure 6 is a schematic diagram of the reciprocating linear motion of the magnet assembly relative to the electromagnet (Example 2).
[0028] Figure 7 is a top view of the linear actuator (with the electromagnet fixing plate and drive arm removed).
[0029] Figure 8 is a schematic diagram of the movement direction of the two sets of magnets (Example 1).
[0030] Figure 9 is a schematic diagram of the movement direction of the two sets of magnets (Example 2).
[0031] Figure 10 is a schematic diagram of the installation frame structure.
[0032] Figure 11 is a schematic diagram of the drive arm structure.
[0033] Figure 12 is a schematic diagram of a second embodiment of the linear actuation device of the present invention.
[0034] Figures 13 and 14 are schematic diagrams of a third embodiment of the linear actuator of the present invention. Detailed Implementation
[0035] To facilitate understanding of the present invention, a more comprehensive description will be given below with reference to the accompanying drawings.
[0036] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to and integrated with the other component, or there may be an intervening component present. The terms "mounted," "one end," "the other end," and similar expressions used in this document are for illustrative purposes only.
[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0038] This embodiment provides a specific implementation of a linear actuation device, as shown in Figures 1-3 and 12-14. It includes at least one horizontally arranged electromagnet 100. The number of electromagnets 100 can be one or more. In this embodiment, two electromagnets 100 are used, which can generate two pairs of magnetic field combinations, increase the stability of the reciprocating motion of the magnet assembly 300 and increase the magnetic force, while also saving costs. The electromagnet 100 includes a metal core 110 and an insulating winding box 130 sleeved on the metal core 110. A coil 120 is wound around the insulating winding box 130. The metal core 110 includes at least five metal sheets 111. Multiple metal sheets 111 are stacked to form the metal core 110. The thickness of the metal sheets 111 should be within 0.5 mm (inclusive). The metal sheets 111 can be I-shaped. When the required thickness of the metal core 110 is required, it needs to be achieved by assembling multiple metal sheets 111 together. For example, if the required overall thickness of the metal core 110 is 3mm, if 0.3mm metal sheets 111 are used, ten metal sheets 111 are needed; if 0.5mm metal sheets 111 are used, six metal sheets 111 are needed. In addition, the thickness of the metal sheets 111 is set to be within 0.5mm (inclusive) so that eddy currents will not be generated inside the metal sheets 111 when magnetization is applied, saving energy consumption and significantly reducing heat generation, without affecting the performance and energy efficiency of the linear actuator. The insulating winding box 130 is made of polymer material and its thickness does not exceed 1mm (inclusive). If the winding box 130 is too thick, it will affect the magnetic conductivity and occupy space.
[0039] In this embodiment, referring to Figures 1, 2, and 4, a magnet assembly 300 is provided at at least one end of the electromagnet 100's magnetic pole 112, meaning the electromagnet 100 has two magnetic poles 112. The magnet assembly 300 can be provided only at one end of the magnetic pole 112, or it can be provided at both ends of the electromagnet 100's magnetic poles 112. In this embodiment, the magnet assemblies 300 are provided at both ends of the electromagnet 100's magnetic poles 112, thereby driving at least two components requiring linear motion to reciprocate in the same or opposite directions. The magnet assembly 300 includes at least two magnets 320, meaning there can be two or more magnets 320. The 00 also includes a magnetically conductive metal 310, and magnets 320 are arranged on the surface of the magnetically conductive metal 310 along its length. Some of the magnets 320 have an S pole on the side facing the electromagnet 100, and the other part of the magnets 320 have an N pole on the side facing the electromagnet 100. In the same magnet group 300, since some of the magnets 320 have an S pole on the side facing the electromagnet 100 and the other part of the magnets 320 have an N pole on the side facing the electromagnet 100, after the electromagnet 100 is energized, the magnetic induction between the electromagnet 100 and the magnet group 300 causes the magnet group 300 to reciprocate along the direction perpendicular to the central axis B of the electromagnet 100.
[0040] In this embodiment, when there are two or more electromagnets 100, all electromagnets 100 are arranged horizontally side by side. After all electromagnets 100 are energized, the polarities of the magnetic poles 112 at the same end of all electromagnets 100 are opposite. The magnet group 300 has three or more magnets 320, and the polarities of the side of all magnets 320 facing the electromagnet 100 are arranged alternately with S pole and N pole. For example, when there are two electromagnets 100, after AC energizing, at the same end of the two electromagnets 100, the magnetic pole 112 of one electromagnet 100 is N pole, and the magnetic pole 112 of the other electromagnet 100 is S pole. The opposite polarities of the magnetic poles 112 at the same end of the two electromagnets 100 can be achieved by the opposite winding direction of the coil 120, so that the current flowing through the coil 120 after the two electromagnets 100 are connected in series. Conversely, the polarities of the magnetic poles 112 at the same end of the two electromagnets 100 can be reversed; alternatively, the two electromagnets 100 can be connected in parallel with their positive and negative terminals reversed, causing the current to flow in opposite directions in the coil 120, thus making the polarities of the magnetic poles 112 at the same end of the two electromagnets 100 reverse. However, this structure requires the two electromagnets 100 to be controlled separately, increasing the structural complexity of the control circuit and raising the manufacturing cost of the linear actuator. In this case, the magnet group 300 has three magnets 320, and the polarity of the side of the three magnets 320 facing the electromagnet 100 can be S-N-S or N-S-N. As shown in Figure 5, a schematic diagram of the reciprocating linear motion of the magnet group 300 relative to the electromagnet 100 in this embodiment is shown, with the magnet group moving upward in the direction of the arrow. In another embodiment, when there are two or more electromagnets 100, all electromagnets 100 are arranged side by side, and when all electromagnets 100 are energized, the polarity of the magnetic poles 112 at the same end of all electromagnets 100 is the same; the magnet group 300 has three or more magnets 320, and the polarity of the side of all magnets 320 facing the electromagnet 100 is arranged in a unit arrangement of S-S-N, N-S-S, S-N-N, or N-N-S; for example. When there are two electromagnets 100, after alternating current is applied, the polarity of the magnetic poles 112 at the same end of the two electromagnets 100 is N pole. At this time, the magnet assembly 300 has three magnets 320, and the polarity of the side of the three magnets 320 facing the electromagnet 100 can be S-S-N, N-S-S, S-N-N, or N-N-S, as shown in Figure 6, which illustrates the reciprocating linear motion of the magnet assembly 300 relative to the electromagnet 100 in this embodiment. The magnet assembly moves downward in the direction of the arrow. The above structure ensures that the magnet assembly 300 can smoothly perform reciprocating linear motion.
[0041] In a preferred embodiment, referring to Figure 7, the number of magnets 320 in the magnet group 300 is one more than the number of electromagnets 100. The perpendicular line A to the center of the surface of the magnet 320 is staggered with the central axis B of the electromagnet 100, and the central axis B of a single electromagnet 100 is located between the perpendicular lines A of the centers of two adjacent magnets 320. Preferably, the central axis B of a single electromagnet 100 coincides with the junction of two adjacent magnets 320, which can ensure that the magnetic flux generated by a single electromagnet 100 (at least more than half of the magnetic flux) passes through at least two magnets 320 located on the same side at the same time, further ensuring that the magnet group 300 can smoothly perform reciprocating linear motion.
[0042] In the preferred embodiment, referring to Figures 1, 2, and 7, there are two sets of magnet groups 300, each corresponding to one of the two magnetic poles 112 of the electromagnet 100. The magnetic pole arrangement of all magnets 320 facing the electromagnet 100 in one set of magnet groups 300 is the same as that in the other set. For example, each set of magnet groups 300 has three magnets 320. The magnetic pole arrangement of all magnets 320 facing the electromagnet 100 in one set is S-N-S, and the magnetic pole arrangement of all magnets 320 facing the electromagnet 100 in the other set is also S-N-S. As shown in Figure 8, which is a schematic diagram of the movement directions of the two sets of magnet groups 300, the two sets of magnet groups 300 move in opposite directions. This is achieved by moving the two sets of magnet groups 300... Reversing the direction can reduce amplitude, alleviate vibration, and lower noise. In another embodiment, there are two sets of magnet groups 300, which are respectively set to correspond to the two magnetic poles 112 of the electromagnet 100. The magnetic pole arrangement of all magnets 320 facing the electromagnet 100 in one set of magnet groups 300 is opposite to that in the other set of magnet groups 300. For example, each set of magnet groups 300 has three magnets 320. The magnetic pole arrangement of all magnets 320 facing the electromagnet 100 in one set of magnet groups 300 is S-pole-N-S-pole, and the magnetic pole arrangement of all magnets 320 facing the electromagnet 100 in the other set of magnet groups 300 is N-pole-S-N-pole. As shown in Figure 9, which is a schematic diagram of the movement direction of the two sets of magnet groups 300, the movement direction of the two sets of magnet groups 300 is the same.
[0043] In a preferred embodiment, the linear actuation device includes a mounting frame 200. The mounting frame 200 has multiple implementations, and three specific implementations are given in this invention. In the first implementation, see Figures 1, 2, 7 and 10. The mounting frame 200 includes an electromagnet mounting part and a magnet assembly mounting part. The magnet assembly mounting part is located to the side of the electromagnet mounting part and is opposite to the magnetic pole 112 of the electromagnet 100 installed in the electromagnet mounting part. The magnet assembly mounting part is elastically connected to the electromagnet mounting part through an elastic connecting part. In this embodiment, the elastic connecting part and the electromagnet mounting part are integrally formed. Specifically, the electromagnet mounting part is connected to the elastic connecting part through a connecting wall. The three are integrally formed, which simplifies the production process and reduces assembly errors during assembly. The number of magnet assembly mounting parts is set according to the number of magnet assemblies 300; there can be only one or two. When there are two magnet assembly mounting parts, the two magnet assembly mounting parts are arranged on both sides of the electromagnet mounting part, and each magnet assembly mounting part is opposite to one of the magnetic poles 112 of the electromagnet 100 installed in the electromagnet mounting part. Connecting walls 201 are respectively provided on both sides of the electromagnet mounting part, and a first extension 213 is provided on the connecting wall 201. A second extension 214 is respectively provided on both sides of the magnet assembly mounting part. The first extension 213 and the second extension 214 on the same side extend in the same direction and are connected to each other by an elastic connecting part. Specifically, the magnet assembly mounting part includes a side wall 230 and a pair of stops 202 extending toward the electromagnet mounting part on one side of the side wall 230. The two stops 202 are spaced apart to provide The installation space of the magnet assembly 300 includes a second extension 214 located at both ends of the side wall 230, extending outward from both ends of the side wall 230. The stopper 202 prevents the magnet assembly 300 from detaching from the magnet assembly mounting part during reciprocating motion. The electromagnet mounting part includes a supporting bottom surface and supporting walls 210 arranged symmetrically and at intervals on the supporting bottom surface. Two grooves 211 are provided at intervals on the end faces of the two supporting walls 210, and the two grooves 211 on the two supporting walls 210 correspond one-to-one. When the two electromagnets 100 are installed in the electromagnet mounting part, the two ends of their metal cores 110 are supported in the corresponding grooves 211. The electromagnets 100 are pressed and secured in the electromagnet mounting part by the electromagnet fixing piece 212. Since the electromagnet mounting part is fixed, while the magnet assembly mounting part reciprocates with the magnet assembly 300, the elastic connection part plays a role in buffering and elastic reset. The electromagnet mounting part, magnet assembly mounting part, elastic connection part, connecting wall 201, and extension part can be assembled to form the mounting frame 200, or the mounting frame 200 can be directly formed by integral molding. In this embodiment, integral molding is used. The mounting frame 200 is made of plastic, which is beneficial for the deformation and recovery of the elastic connection part.In this embodiment, referring to Figure 10, the elastic connection portion includes at least one first elastic support portion 220. In this embodiment, two first elastic support portions 220 are provided, and a second elastic support portion 240 is also included. The second elastic support portion 240 is located between the two first elastic support portions 220, and the thickness of the second elastic support portion 240 is greater than the thickness of the first elastic support portion 220. The second elastic support portion 240 stores more elastic potential energy to help the magnet assembly 300 return to its original position. At the same time, by placing the thicker second elastic support portion 240 between the two thinner first elastic support portions 220, the deformation of the first elastic support portions 220 on both sides can be more uniform during movement, avoiding any first elastic support portion 220 from being damaged or broken first because its deformation is greater than that of the other first elastic support portions 220. In addition, one end of the first elastic support portion 220 is connected to the first extension portion 213, and the other end is connected to the second extension portion 214. One end of the second elastic support portion 240 is connected to the first extension portion 213, and the other end is connected to the second extension portion 214. The portion of the second extension portion 214 located between the first elastic support portion 220 and the second elastic support portion 240, and the portion located between the first elastic support portion 220 and the adjacent stop 202 (which can be understood as located between the first elastic support portion 220 and the magnet assembly mounting portion) is set to an arc shape 222. The portion of the first extension portion 213 located between the first elastic support portion 220 and the second elastic support portion 240, and the portion located between the first elastic support portion 220 and the adjacent connecting wall 201 is also set to an arc shape 222. The radius of the arc shape 222 is 0.5 mm or more (including 0.5 mm). By setting the arc shape 222 and limiting its radius, the stress at the edge of the connection can be distributed, and the stress can be prevented from exceeding the material strength and causing cracks. In this embodiment, referring to Figures 1, 2, and 11, a drive arm 400 is connected to the magnet assembly mounting portion, and an output shaft 421 is provided on the drive arm 400, with the output shaft 421 located above the mounting frame 200. The drive arm 400 includes a fixing portion 410 and an output shaft connecting portion 420. The fixing portion 410 is connected to the side wall 230 of the magnet assembly mounting portion, while the output shaft connecting portion 420 is bent relative to the fixing portion 410 and located above the mounting frame 200. The output shaft 421 is mounted on the output shaft connecting portion 420. The number of output shafts 421 is determined by the number of components that need to perform reciprocating linear motion. In this embodiment, each drive arm 400 is provided with two output shafts 421. The two output shafts 421 on the same side are arranged at intervals along the direction perpendicular to the reciprocating motion of the magnet group 300. That is, one magnet group 300 drives two output shafts 421 to perform reciprocating linear motion, and two magnet groups 300 drive four output shafts 421 to perform reciprocating linear motion. For example, when the component that needs to perform reciprocating linear motion is the moving blade assembly in the hair cutting device, four moving blade assemblies can be set, which results in high cutting efficiency and cleaner shaving.In this embodiment, referring to Figures 1 and 2, a positioning hole is provided on the drive arm 400, and a positioning protrusion is provided on the magnet assembly mounting part. When the drive arm 400 is connected to the magnet assembly 300 mounting part, the positioning protrusion is inserted into the positioning hole to position the drive arm 400, facilitating the positioning and installation of the drive arm 400. In this embodiment, the free ends of the two drive arms 400 are arranged opposite each other.
[0044] The present invention also provides a second embodiment of the mounting frame 200. Referring to Figure 12, the mounting frame 200 in this embodiment has a structure that is largely the same as that in the first embodiment, except that in this embodiment, the electromagnet mounting part is formed independently and then assembled with the connecting wall 201 and the elastic connecting part. Specifically, the electromagnet mounting part includes two symmetrically arranged and spaced support walls 210. The two sides of the two support arms 210 are connected by side edges 203 respectively. The top surface 2031 of each side edge 203 is concave or convex, while the bottom surface 2011 of the connecting wall 201 is aligned with the corresponding side edge 203. The top surface 2031 is in a shape that matches the other side 203. For example, when the top surface 2031 of the side 203 is concave, the bottom surface 2011 of the connecting wall 201 is convex, and vice versa. When assembling the electromagnet mounting part with the connecting wall 201, the support arm 210 of the electromagnet mounting part is inserted between the two connecting walls 201. The top surface 2031 of the side 203 of the electromagnet mounting part abuts against the bottom surface 2011 of the corresponding side connecting wall 201, and the side 203 is fastened to the corresponding side connecting wall 201 by fasteners, thereby connecting the electromagnet mounting part with the connecting wall 201 and indirectly connecting it with the elastic connecting part. In addition, this embodiment differs from the first embodiment described above in that the drive arm 400 and the magnet assembly mounting part are integrally formed, thereby simplifying the manufacturing process and avoiding errors caused by assembly. Specifically, the drive arm 400 includes an output shaft connecting part 420, which is directly integrally formed with the magnet assembly mounting part.
[0045] The present invention also provides a third embodiment of the mounting frame 200. Referring to Figure 13, the mounting frame 200 in this embodiment has a structure that is largely the same as that in the second embodiment described above. The difference is that the free ends of the two drive arms 400 in this embodiment are staggered. By setting the two drive arms 400 in a staggered state, better dynamic balance can be achieved, and vibration can be further reduced. Specifically, there are two specific implementations for the staggered arrangement of the free ends of the two drive arms 400. One is shown in Figure 14, where the free ends of the two drive arms 400 are staggered. The other is shown in Figure 13, where the output shaft connection portion 420 of the drive arm 400 includes a connected head 4. 001 and neck 4002, drive arm 400 is integrally connected to magnet assembly mounting part through neck 4002. The size of head 4001 is larger than that of neck 4002, and the connection between head 4001 and neck 4002 is a concave arc 403. The concave arc 403 and neck form a receiving groove. Part of the head of one drive arm 400 extends into the receiving groove of the other drive arm 400. At the same time, the output shaft 421 on the two drive arms 400 is located on head 4001. The output shaft 421 on the head 4001 of the two drive arms 400 are arranged side by side, so that the free ends of the two drive arms 400 are staggered.
[0046] In the second and third embodiments described above, the fixing piece 212 may not be necessary.
[0047] This embodiment also provides a specific implementation of a hair cutting device, including a housing and at least one moving blade assembly. This embodiment employs four moving blade assemblies. A linear actuator is installed within the housing. The moving blade assemblies reciprocate with the magnet assembly 300 under the power provided by the magnet assembly 300 of the linear actuator. Specifically, the moving blade assemblies are connected to the output shaft 421 and to the magnet assembly mounting part via a drive arm 400, allowing them to perform reciprocating linear motion with the magnet assembly 300 for hair cutting. Because the hair cutting device has the aforementioned linear actuator, the length (or height) of the housing can be shortened, fully utilizing the lateral space inside the housing and improving the aesthetics of the hair cutting device. Furthermore, the hair cutting device, due to the aforementioned linear actuator, also possesses all the beneficial technical effects it brings, which will not be elaborated upon here.
[0048] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0049] In the description of this specification, the references to terms such as "preferred embodiment," "another embodiment," "other embodiment," or "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0050] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A linear actuation device, characterized in that: The device includes a mounting frame, which comprises an electromagnet mounting section and a magnet assembly mounting section. The magnet assembly mounting section is located to the side of the electromagnet mounting section. An electromagnet is horizontally arranged in the electromagnet mounting section, and a magnet assembly is arranged in the magnet assembly mounting section. After the magnet assembly is installed in the magnet assembly mounting section, its magnetic pole is opposite to one end of the electromagnet installed in the electromagnet mounting section.
2. The linear actuator according to claim 1, characterized in that: There are two magnet assembly mounting sections, located on both sides of the electromagnet mounting section. Each magnet assembly mounting section contains a magnet assembly, and each magnet assembly is opposite to one end of the electromagnet installed in the electromagnet mounting section.
3. The linear actuator according to claim 1 or 2, characterized in that: The magnet assembly mounting part is elastically connected to the electromagnet mounting part through an elastic connecting part; the elastic connecting part and the electromagnet mounting part are integrally formed or detachably connected by fasteners.
4. The linear actuator according to claim 3, characterized in that: Connecting walls are provided on both sides of the electromagnet mounting part, and a first extension is provided on the connecting wall. A second extension is provided on both sides of the magnet assembly mounting part. The first extension and the second extension on the same side extend in the same direction. The first extension and the second extension on the same side are connected by an elastic connecting part.
5. The linear actuator according to claim 3, characterized in that: The elastic connection includes at least one first elastic support.
6. The linear actuator according to claim 5, characterized in that: The elastic connection portion further includes a second elastic support portion. There are two first elastic support portions, and the second elastic support portion is located between the two first elastic support portions. The thickness of the second elastic support portion is greater than the thickness of the first elastic support portions on both sides of it.
7. The linear actuator according to claim 4, characterized in that: The elastic connection portion includes two first elastic support portions, and the elastic connection portion further includes a second elastic support portion, the second elastic support portion being located between the two first elastic support portions; the portion of the first extension portion located between the first elastic support portion and the second elastic support portion and the portion located between the first elastic support portion and the connecting wall are configured as arc-shaped; the portion of the second extension portion located between the first elastic support portion and the second elastic support portion and the portion located between the first elastic support portion and the magnet assembly mounting portion are configured as arc-shaped.
8. The linear actuator according to claim 1, characterized in that: A drive arm is connected to the magnet assembly mounting part, and an output shaft is provided on the drive arm, the output shaft being located above the mounting frame.
9. The linear actuator according to claim 8, characterized in that: The drive arm is provided with a positioning hole, and the magnet assembly mounting part is provided with a positioning protrusion. When the drive arm is connected to the magnet assembly mounting part, the positioning protrusion is inserted into the positioning hole to position the drive arm; or, the drive arm and the magnet assembly mounting part are integrally formed.
10. The linear actuator according to claim 8 or 9, characterized in that: There are two drive arms, which are respectively installed on the magnet assembly on both sides. The free ends of the two drive arms are staggered or opposite to each other.
11. A hair cutting device, comprising a housing and at least one moving blade assembly, characterized in that: A linear actuation device as described in any one of claims 1-10 is provided inside the housing, the moving blade assembly is connected to the magnet assembly mounting part, and the moving blade assembly reciprocates with the magnet assembly under the power provided by the magnet assembly of the linear actuation device.