Linear actuating device and hair cutting device

Abstract

The utility model relates to the technical field of linear motors, and particularly discloses a linear actuating device and a hair cutting device, which are characterized in that an installation frame is arranged, an electromagnet is horizontally arranged in an electromagnet installation part, and a magnet group is arranged in a magnet group installation part; after alternating current is supplied to the electromagnet, the magnet set can be promoted to move in a reciprocating mode in the direction perpendicular to the center axis of the electromagnet through the magnetic induction effect of the electromagnet and the magnet set. The electromagnet is horizontally arranged, and meanwhile, the magnet group is arranged on the side of the electromagnet and is opposite to the magnetic pole of the electromagnet, so that the transverse space can be fully utilized, the height of the linear actuating device is greatly reduced, the length of a product adopting the linear actuating device is reduced, and the proportions of the linear actuating device in the length direction and the transverse direction are coordinated; the aesthetic feeling of the product appearance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of linear motors, in particular to a linear actuating device and a hair cutting device containing the linear actuating device. Background Art

[0002] A linear actuator is a device used to control linear displacement or force. It generates a magnetic field through the principle of electromagnetic induction, and uses this magnetic field to apply force or motion to the load, thereby achieving linear control of the load. In the existing linear actuator structure, since the electromagnet in the stator assembly is arranged in a vertical state, in order to achieve smooth magnetic induction and drive the load that requires linear motion to move back and forth smoothly, the magnet group in the mover assembly needs to be arranged at the top of the electromagnet, that is, the mover assembly is located above the stator assembly. At this time, only one magnetic pole on the electromagnet is facing the magnet group in the mover assembly, and the other magnetic pole is in a useless state. The magnet group in the mover assembly is located above the magnetic pole at the top of the electromagnet. Through the magnetic induction effect of the magnet group and the magnetic poles at the corresponding ends of the electromagnet, the magnet group can be The electromagnet performs reciprocating motion and drives a load that needs to perform linear motion (such as the movable blade assembly in a hair cutting device) to perform reciprocating motion. However, the electromagnet itself has a certain height. When it is arranged vertically, the vertical length of the linear actuator is increased, resulting in a product using this linear actuator requiring more installation space in the vertical direction, increasing the length and resulting in lower lateral space utilization. Moreover, due to the length in the height (which can also be understood as the length direction), the proportions of the product appearance in the length direction and the lateral direction are not coordinated, resulting in an unsightly appearance of the entire product. Utility Model Content

[0003] The present invention aims to address the technical problems existing in the above-mentioned prior art by providing a linear actuator that improves space utilization, thereby reducing the size of the linear actuator, rationally utilizing lateral space, and improving the aesthetics of the linear actuator. Furthermore, the present invention provides a hair cutting device having the linear actuator.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] The utility model discloses a linear actuating device, comprising a mounting frame, wherein the mounting frame comprises an electromagnet mounting portion and a magnet group mounting portion, wherein the magnet group mounting portion is located to the side of the electromagnet mounting portion, an electromagnet is horizontally arranged in the electromagnet mounting portion, and a magnet group is arranged in the magnet group mounting portion. After the magnet group is installed in the magnet group mounting portion, the magnet group is opposite to one end magnetic pole of the electromagnet installed in the electromagnet mounting portion.

[0006] The present invention describes a linear actuator device that utilizes a mounting frame to horizontally position an electromagnet within an electromagnet mounting portion. A magnet assembly is positioned within the mounting portion, such that the poles of the magnet assembly and the corresponding ends of the horizontally positioned electromagnet face each other. When alternating current is applied to the electromagnet, the magnetic induction between the electromagnet and the magnet assembly causes the magnet assembly to reciprocate perpendicular to the central axis of the electromagnet. By arranging the electromagnet horizontally and positioning the magnet assembly to the side of the electromagnet, with the poles facing each other, the horizontal space is fully utilized, significantly reducing the height of the linear actuator device. This reduces the length of products incorporating the linear actuator device, resulting in a more balanced length and width, and enhancing the aesthetics of the product.

[0007] Furthermore, there are two magnet group mounting parts, which are arranged on both sides of the electromagnet mounting part. A magnet group is arranged in each magnet group mounting part, and each magnet group is opposite to one end pole of the electromagnet installed in the electromagnet mounting part.

[0008] Furthermore, the magnet assembly mounting portion is elastically connected to the electromagnet mounting portion via an elastic connecting portion; the elastic connecting portion and the electromagnet mounting portion are connected in one piece or are detachably connected via fasteners.

[0009] Furthermore, connecting walls are respectively provided on both sides of the electromagnet mounting portion, a first extension portion is provided on the connecting wall, and second extension portions are respectively provided on both sides of the magnet group mounting portion. The first extension portion and the second extension portion on the same side have the same extension direction, and the first extension portion and the second extension portion on the same side are connected by an elastic connecting portion.

[0010] Furthermore, the elastic connecting portion includes at least one first elastic supporting portion.

[0011] Furthermore, the elastic connecting portion also includes a second elastic supporting portion, there are two first elastic supporting portions, the second elastic supporting portion is located between the two first elastic supporting portions, and the thickness of the second elastic supporting portion is greater than the thickness of the first elastic supporting portions on both sides thereof.

[0012] Furthermore, the elastic connection portion includes two first elastic supporting portions, and the elastic connection portion also includes a second elastic supporting portion, and the second elastic supporting portion is located between the two first elastic supporting portions;

[0013] The portion of the first extension portion located between the first elastic supporting portion and the second elastic supporting portion and the portion located between the first elastic supporting portion and the connecting wall are configured in an arc shape;

[0014] The second extension portion is configured such that a portion located between the first elastic support portion and the second elastic support portion and a portion located between the first elastic support portion and the magnet assembly mounting portion are configured such that the second extension portion is in an arc shape.

[0015] Furthermore, a driving arm is connected to the magnet group mounting portion, and an output shaft is provided on the driving arm, and the output shaft is located above the mounting frame.

[0016] Furthermore, a positioning hole is provided on the driving arm, and a positioning protrusion is provided on the magnet group mounting portion. When the driving arm is connected to the magnet group mounting portion, the positioning protrusion is inserted into the positioning hole to position the driving arm;

[0017] Alternatively, the driving arm and the magnet assembly mounting portion are integrally formed.

[0018] Furthermore, there are two driving arms, which are respectively arranged on the magnet group mounting parts on both sides, and the free ends of the two driving arms are staggered or opposite to each other.

[0019] The hair cutting device described in the present invention includes a housing and at least one movable blade assembly. The above-mentioned linear actuator is disposed within the housing. The movable blade assembly is connected to a magnet assembly mounting portion. The movable blade assembly reciprocates with the magnet assembly under the power provided by the magnet assembly of the linear actuator.

[0020] The hair cutting device described in this utility model, due to its inclusion of the aforementioned linear actuator, can shorten the length (also understood as the height) of the hair cutting device housing, fully utilizing the lateral space within the housing and enhancing the aesthetics of the hair cutting device. Furthermore, the hair cutting device also possesses all the beneficial technical effects associated with the aforementioned linear actuator, which will not be detailed here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other purposes, features and advantages of the present invention will become more apparent through a more detailed description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings, and the drawings are not intentionally scaled to actual size. The emphasis is on illustrating the subject matter of the present invention.

[0022] Figure 1 It is a perspective view of the first embodiment of the linear actuator of the present invention.

[0023] Figure 2 for Figure 1 Schematic diagram of the decomposition.

[0024] Figure 3 Schematic diagram of the structure of two electromagnets.

[0025] Figure 4Schematic diagram of the magnet group structure.

[0026] Figure 5 Schematic diagram of the reciprocating linear motion of the magnet group relative to the electromagnet (Example 1).

[0027] Figure 6 Schematic diagram of the reciprocating linear motion of the magnet group relative to the electromagnet (Example 2).

[0028] Figure 7 A top view of the linear actuator (without the electromagnet fixing plate and the drive arm).

[0029] Figure 8 Schematic diagram of the movement direction of two groups of magnets (Example 1).

[0030] Figure 9 Schematic diagram of the movement direction of two groups of magnets (Example 2).

[0031] Figure 10 Schematic diagram of the installation frame structure.

[0032] Figure 11 Schematic diagram of the drive arm structure.

[0033] Figure 12 This is an exploded schematic diagram of a second embodiment of the linear actuating device of the present invention.

[0034] Figure 13 and 14 This is a schematic diagram of a third embodiment of the linear actuating device of the present invention. DETAILED DESCRIPTION

[0035] In order to facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

[0036] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element and integrated therewith, or there may be an intermediate element. The terms "mounted", "one end", "the other end" and similar expressions used herein are for illustrative purposes only.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the relevant listed items.

[0038] This embodiment specifically provides an implementation of a linear actuator, see Figure 1-3And 12-14, including at least one horizontally arranged electromagnet 100, the number of electromagnets 100 can be one or more, and two electromagnets 100 are used in this embodiment, which can generate two pairs of magnetic field combinations, increase the stability of the reciprocating motion of the magnet group 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, and a coil 120 is wound around the insulating winding box 130, wherein the metal core 110 includes at least five metal sheets 111, and multiple metal sheets 111 are stacked to form the metal core 110, and the thickness of the metal sheet 111 is within 0.5 mm (including 0.5 mm), and the metal sheet 111 can be I-shaped; when the required thickness of the metal core 110 is required When the thickness of the metal core 110 is desired, it is necessary to assemble multiple metal sheets 111 together to achieve the overall thickness of the metal core 110. For example, when the overall thickness of the metal core 110 is required to be 3 mm, if a 0.3 mm metal sheet 111 is used, ten metal sheets 111 are required. If a 0.5 mm metal sheet 111 is used, six metal sheets 111 are required. In addition, the thickness of the metal sheet 111 is set to be within 0.5 mm (including 0.5 mm). When magnetization occurs, eddy currents will not be generated inside the metal sheet 111, thereby saving energy and significantly reducing heat generation, and not affecting the performance and energy efficiency of the linear actuator. The insulating winding box 130 is made of a polymer material and its thickness does not exceed 1 mm (including 1 mm). If the absolute winding box 130 is too thick, it will affect the magnetic conductivity and occupy space.

[0039] In this embodiment, see Figure 1 、 24. A magnet group 300 is provided at at least one end of the magnetic pole 112 of the electromagnet 100, that is, the electromagnet 100 has two magnetic poles 112. The magnet group 300 can be provided at only one end of the magnetic pole 112, or at both magnetic poles 112 of the electromagnet 100. In this embodiment, the magnet groups 300 are provided at the two magnetic poles 112 of the electromagnet 100, so that at least two components that need to perform linear motion can be driven to reciprocate in the same direction or in opposite directions; the magnet group 300 includes at least two magnets 320, that is, the magnets 320 can be two or more than two, and the magnet group 300 also includes The magnetic metal 310 and the magnets 320 are arranged on the surface of the magnetic metal 310 along the length direction of the magnetic metal 310; some of the magnets 320 have an S pole facing the electromagnet 100, and another part of the magnets 320 have an N pole facing the electromagnet 100. In the same magnet group 300, since some of the magnets 320 have an S pole facing the electromagnet 100 and another part of the magnets 320 have an N pole facing the electromagnet 100, when the electromagnet 100 is energized, the magnetic induction effect between the electromagnet 100 and the magnet group 300 causes the magnet group 300 to move back and forth in a direction perpendicular to the central axis B of the electromagnet 100.

[0040] In this embodiment, when there are more than two electromagnets 100, all the electromagnets 100 are arranged horizontally side by side. After all the electromagnets 100 are energized, the polarities of the magnetic poles 112 at the same end of all the electromagnets 100 are opposite. The magnet group 300 has more than three magnets 320, and the polarities of the sides of all the magnets 320 facing the electromagnet 100 are arranged alternately according to the S pole and the N pole. For example, when there are two electromagnets 100, after alternating current is passed through, at the same end of the two electromagnets 100, the polarity of the magnetic pole 112 of one electromagnet 100 is the N pole, and the polarity of the magnetic pole 112 of the other electromagnet 100 is the S pole. The polarities of the magnetic poles 112 at the same end of the two electromagnets 100 are opposite, which can be achieved by the opposite winding directions of the coils 120. Inversely, after the two electromagnets 100 are connected in series, the currents flowing through the coils 120 are opposite, thereby causing the polarities of the magnetic poles 112 at the same end of the two electromagnets 100 to be opposite; it is also possible to set the two electromagnets 100 in parallel so that the positive and negative poles of the two are connected in opposite directions, thereby causing the current to flow in opposite directions in the coils 120, thereby causing the polarities of the magnetic poles 112 at the same end of the two electromagnets 100 to be opposite, but this structure requires the two electromagnets 100 to be controlled separately, which increases the structural complexity of the control circuit and increases the manufacturing cost of the linear actuator; at this time, 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 pole-N pole-S pole or N pole-S pole-N pole, such as Figure 5FIG. 1 shows a schematic diagram of the reciprocating linear motion of the magnet group 300 relative to the electromagnet 100 in this embodiment, and the magnet group moves upward in the direction of the arrow. In another embodiment, when there are more than two electromagnets 100, all the electromagnets 100 are arranged side by side, and when all the electromagnets 100 are energized, the polarity of the magnetic poles 112 at the same end of all the electromagnets 100 is the same; the magnet group 300 has more than three magnets 320, and the polarity of the side of all the magnets 320 in the magnet group 300 facing the electromagnet 100 is arranged in a unit arrangement of S pole-S pole-N pole, a unit arrangement of N pole-S pole-S pole, or a unit arrangement of S pole-N pole-N pole. For example, when there are two electromagnets 100, after an alternating current is applied, the polarity of the magnetic pole 112 at the same end of the two electromagnets 100 is the N pole. At this time, the magnet group 300 has three magnets 320, and the polarity of the sides of the three magnets 320 facing the electromagnet 100 can be S pole-S pole-N pole, N pole-S pole-S pole, S pole-N pole-N pole, or N pole-N pole-S pole, as shown in FIG. Figure 6 FIG. 1 shows a schematic diagram of the reciprocating linear motion of the magnet group 300 relative to the electromagnet 100 in this embodiment, wherein the magnet group moves downward in the direction of the arrow. The above structure ensures that the magnet group 300 can smoothly perform the reciprocating linear motion.

[0041] In the preferred embodiment, see 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 perpendicular 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 between 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. This ensures that the magnetic flux generated by the single electromagnet 100 (at least more than half of the magnetic flux) simultaneously passes through at least two magnets 320 located on the same side, further ensuring smooth reciprocating linear motion of the magnet group 300.

[0042] In the preferred embodiment, see Figure 1 、 2 7. There are two groups of magnet groups 300, which are respectively arranged corresponding to the two magnetic poles 112 of the electromagnet 100; the magnetic pole arrangement of all the magnets 320 in one group of magnet groups 300 facing the electromagnet 100 is the same as the magnetic pole arrangement of all the magnets 320 in the other group of magnet groups 300 facing the electromagnet 100. For example, each magnet group 300 has three magnets 320, and the magnetic pole arrangement of all the magnets 320 in one group of magnet groups 300 facing the electromagnet 100 is S pole-N pole-S pole, and the magnetic pole arrangement of all the magnets 320 in the other group of magnet groups 300 facing the electromagnet 100 is also S pole-N pole-S pole, as shown in FIG. Figure 8 As shown in FIG, it is a schematic diagram of the movement direction of the two magnet groups 300. At this time, the movement directions of the two magnet groups 300 are opposite. By making the movement directions of the two magnet groups 300 opposite, the amplitude, vibration and noise can be reduced. In another embodiment, there are two groups of magnet groups 300, which are respectively arranged corresponding to the two magnetic poles 112 of the electromagnet 100. The magnetic pole arrangement of all the magnets 320 in one magnet group 300 facing the electromagnet 100 is opposite to the magnetic pole arrangement of all the magnets 320 in the other magnet group 300 facing the electromagnet 100. For example, each magnet group 300 has three magnets 320, and the magnetic pole arrangement of all the magnets 320 in one magnet group 300 facing the electromagnet 100 is S pole-N pole-S pole, and the magnetic pole arrangement of all the magnets 320 in the other magnet group 300 facing the electromagnet 100 is N pole-S pole-N pole. Figure 9 , which is a schematic diagram of the movement directions of the two magnet groups 300 . At this time, the movement directions of the two magnet groups 300 are the same.

[0043] In a preferred embodiment, the linear actuator includes a mounting frame 200. The mounting frame 200 has multiple embodiments. Three specific embodiments are given in this utility model. The first embodiment is shown in FIG. Figure 1 、 2, 7 and 10, the mounting frame 200 includes an electromagnet mounting portion and a magnet group mounting portion, the magnet group mounting portion is located on the side of the electromagnet mounting portion and is opposite to the magnetic pole 112 of the electromagnet 100 mounted in the electromagnet mounting portion, the magnet group mounting portion is elastically connected to the electromagnet mounting portion through an elastic connecting portion, in this embodiment, the elastic connecting portion and the electromagnet mounting portion are integrally formed, specifically, the electromagnet mounting portion is connected to the elastic connecting portion through a connecting wall, the three are integrally formed, which simplifies the production process and reduces assembly errors during assembly. The number of magnet group mounting parts is set according to the number of magnet groups 300, and can be only one or two. When there are two magnet group mounting parts, the two magnet group mounting parts are arranged on both sides of the electromagnet mounting part, and each magnet group 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 part 213 is provided on the connecting wall 201, and second extension parts 214 are respectively provided on both sides of the magnet group mounting part. The first extension part 213 and the second extension part 214 on the same side have the same extension direction, and the first extension part 213 and the second extension part 214 on the same side are connected by an elastic connection part. Specifically, the magnet group 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 arranged at intervals to provide The installation space of the magnet group 300, wherein the second extension part 214 is arranged at both ends of the side wall 230, and is formed by extending outward from both ends of the side wall 230. The stopper 202 is used to prevent the magnet group 300 from detaching from the magnet group installation part when it reciprocates; the electromagnet installation part includes a supporting bottom surface and supporting walls 210 symmetrically and spaced apart on the supporting bottom surface, and two grooves 211 are spaced apart on the end faces of the two supporting walls 210, and the two grooves 211 on the two supporting walls 210 correspond to each other one by one. When the two electromagnets 100 are installed in the electromagnet installation part, the two ends of their metal cores 110 are supported in the grooves 211 at the corresponding ends, and the electromagnet 100 is pressed and fastened to the electromagnet installation part by the electromagnet fixing sheet 212. Since the electromagnet installation part is fixed, the magnet group installation part will reciprocate with the magnet group 300. At this time, the elastic connection part plays a role of buffering and elastic reset. The electromagnet mounting portion, the magnet assembly mounting portion, the elastic connection portion, the connecting wall 201 and the extension portion can be assembled to form the mounting frame 200, or can be directly formed into an integral body. In this embodiment, the integral body is used. The mounting frame 200 is made of plastic, which is conducive to the deformation and recovery of the elastic connection portion. In this embodiment, see Figure 10The 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 provided. 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. More elastic potential energy is stored through the second elastic support portion 240 to help the magnet group 300 return to its original position. At the same time, the thicker second elastic support portion 240 is provided between the two thinner first elastic support portions 220, so that the deformation of the first elastic support portions 220 on both sides can be more uniform during movement, thereby avoiding any first elastic support portion 220 from being damaged and broken first due to its deformation being larger than that of 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 blocker 202 (which can be understood as being located between the first elastic support portion 220 and the magnet group mounting portion) is configured as 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 configured as an arc shape 222. The radius of the arc shape 222 is greater than 0.5 mm (including 0.5 mm). By configuring the arc shape 222 and limiting its radius, the stress at the edge of the connection can be dispersed to avoid stress exceeding the material strength and cracks. In this embodiment, see Figure 1 、 211. A drive arm 400 is connected to the magnet assembly mounting portion. An output shaft 421 is provided on the drive arm 400 and is located above the mounting frame 200. The drive arm 400 includes a fixed portion 410 and an output shaft connecting portion 420. The fixed 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 fixed portion 410 and is 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, two output shafts 421 are provided on each drive arm 400. The two output shafts 421 on the same side are spaced apart in a 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, if the component that needs to perform reciprocating linear motion is a movable blade assembly in a hair cutting device, four movable blade assemblies can be provided, which improves cutting efficiency and makes shaving cleaner. In this embodiment, see Figure 1 、 2 A positioning hole is provided on the driving arm 400, and a positioning protrusion is provided on the magnet assembly mounting portion. When the driving arm 400 is connected to the magnet assembly 300 mounting portion, the positioning protrusion is inserted into the positioning hole to position the driving arm 400, thereby facilitating the positioning and installation of the driving arm 400. In this embodiment, the free ends of the two driving arms 400 are arranged opposite each other.

[0044] The present invention also provides a second embodiment of the mounting frame 200, see Figure 12The mounting frame 200 in this embodiment has a substantially similar structure to that of the first embodiment, with the difference being that, in this embodiment, the electromagnet mounting portion is independently formed and then assembled into a single unit with the connecting wall 201 and the elastic connecting portion. Specifically, the electromagnet mounting portion includes two symmetrical 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, and the bottom surface 2011 of the connecting wall is adapted to the shape of the top surface 2031 of the corresponding side edge 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 the electromagnet mounting portion is assembled with the connecting wall 201, the support arm 210 of the electromagnet mounting portion is inserted between the two connecting walls 201, and the top surface 2031 of the side 203 of the electromagnet mounting portion abuts against the bottom surface 2011 of the connecting wall 201 on the corresponding side. The side 203 is fastened to the connecting wall 201 on the corresponding side by a fastener, thereby connecting the electromagnet mounting portion to the connecting wall 201 and indirectly connecting to the elastic connecting portion. In addition, this embodiment differs from the first embodiment described above in that the drive arm 400 is integrally formed with the magnet assembly mounting portion, thereby simplifying the production process and avoiding errors caused by assembly. Specifically, the drive arm 400 includes an output shaft connecting portion 420, which is directly integrally formed with the magnet assembly mounting portion.

[0045] The present invention also provides a third embodiment of the mounting frame 200, see Figure 13 The mounting frame 200 in this embodiment has a substantially similar structure to that in the second embodiment, except that the free ends of the two driving arms 400 in this embodiment are staggered. By staggering the two driving arms 400, better dynamic balance can be achieved, further reducing vibration. Specifically, there are two specific implementations of staggering the free ends of the two driving arms 400. One of them is shown in FIG. Figure 14 , the free ends of the two driving arms 400 are staggered; the second one refers to Figure 13 The output shaft connection part 420 of the driving arm 400 includes a connected head 4001 and a neck 4002. The driving arm 400 is integrally connected to the magnet group mounting part through the neck 4002. The size of the head 4001 is larger than the size of the neck 4002, and the connection between the head 4001 and the neck 4002 is an inward-concave arc 403. A receiving groove is formed by the inward-concave arc 403 and the neck. The head of the driving arm 400 on one side partially extends into the receiving groove of the driving arm 400 on the other side. At the same time, the output shafts 421 on the two driving arms 400 are located on the head 4001, and the output shafts 421 on the heads 4001 of the two driving arms 400 are arranged side by side, so that the free ends of the two driving arms 400 are in an interlaced state.

[0046] In the second and third embodiments above, the fixing plate 212 may not be required.

[0047] This embodiment also specifically provides an embodiment of a hair cutting device, comprising a housing and at least one movable blade assembly. In this embodiment, four movable blade assemblies are employed. The housing is provided with the aforementioned linear actuator. The movable blade assembly reciprocates with the magnet assembly 300 under the power provided by the linear actuator. Specifically, the movable blade assembly is connected to an output shaft 421 and to the magnet assembly mounting portion via a drive arm 400. It can reciprocate linearly with the magnet assembly 300 to perform hair cutting. The inclusion of the aforementioned linear actuator reduces the length (also understood as the height) of the housing, fully utilizing the lateral space within the housing and enhancing the aesthetics of the hair cutting device. Furthermore, the inclusion of the aforementioned linear actuator provides all the beneficial technical effects associated with the hair cutting device, which will not be detailed here.

[0048] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0049] In the description of this specification, the description with reference to the terms "preferred embodiment", "further embodiment", "other embodiments" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0050] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A linear actuator, characterized in that: The invention comprises a mounting frame, wherein the mounting frame comprises an electromagnet mounting portion and a magnet group mounting portion, wherein the magnet group mounting portion is located on the side of the electromagnet mounting portion, an electromagnet is horizontally arranged in the electromagnet mounting portion, and a magnet group is arranged in the magnet group mounting portion. After the magnet group is installed in the magnet group mounting portion, the magnet group is opposite to one end magnetic pole of the electromagnet installed in the electromagnet mounting portion.

2. The linear actuator according to claim 1, characterized in that: There are two magnet group mounting parts, which are respectively arranged on both sides of the electromagnet mounting part. A magnet group is arranged in each magnet group mounting part, and each magnet group is opposite to one end magnetic pole of the electromagnet installed in the electromagnet mounting part.

3. The linear actuator according to claim 1 or 2, characterized in that: The magnet assembly mounting portion is elastically connected to the electromagnet mounting portion via an elastic connecting portion; the elastic connecting portion and the electromagnet mounting portion are connected in one piece or are detachably connected via fasteners.

4. The linear actuator according to claim 3, characterized in that: Connecting walls are respectively provided on both sides of the electromagnet mounting portion, a first extension portion is provided on the connecting walls, and second extension portions are respectively provided on both sides of the magnet group mounting portion. The first extension portion and the second extension portion on the same side have the same extension direction, and the first extension portion and the second extension portion on the same side are connected by an elastic connecting portion.

5. The linear actuator according to claim 3, characterized in that: The elastic connection portion includes at least one first elastic supporting portion.

6. The linear actuator according to claim 5, characterized in that: The elastic connection portion further includes a second elastic supporting portion. There are two first elastic supporting portions. The second elastic supporting portion is located between the two first elastic supporting portions, and the thickness of the second elastic supporting portion is greater than that of the first elastic supporting portions on both sides thereof.

7. The linear actuator according to claim 4, characterized in that: The elastic connection portion includes two first elastic supporting portions, and the elastic connection portion also includes a second elastic supporting portion, and the second elastic supporting portion is located between the two first elastic supporting portions; The portion of the first extension portion located between the first elastic supporting portion and the second elastic supporting portion and the portion located between the first elastic supporting portion and the connecting wall are configured in an arc shape; The second extension portion is configured such that a portion located between the first elastic support portion and the second elastic support portion and a portion located between the first elastic support portion and the magnet assembly mounting portion are configured such that the second extension portion is in an arc shape.

8. The linear actuator according to claim 1, wherein: A driving arm is connected to the magnet group mounting portion, and an output shaft is provided on the driving arm. The output shaft is located above the mounting frame.

9. The linear actuator according to claim 8, characterized in that: A positioning hole is provided on the driving arm, and a positioning protrusion is provided on the magnet group mounting portion. When the driving arm is connected to the magnet group mounting portion, the positioning protrusion is inserted into the positioning hole to position the driving arm; Alternatively, the driving arm and the magnet assembly mounting portion are integrally formed.

10. The linear actuator according to claim 8 or 9, characterized in that: There are two driving arms, which are respectively arranged on the magnet group mounting parts on both sides, and the free ends of the two driving arms are staggered or opposite to each other.

11. A hair cutting device comprising a housing and at least one movable blade assembly, characterized in that: A linear actuator as described in any one of claims 1 to 10 is arranged in the shell, the movable knife assembly is connected to the magnet group mounting portion, and the movable knife assembly reciprocates with the magnet group under the power provided by the magnet group of the linear actuator.

Images