A magnetic conversion device and method for converting mechanical rotary motion into mechanical axial vibration

Abstract

This application relates to a magnetic force conversion device and method for transforming mechanical rotational motion into mechanical axial vibration, belonging to the field of magnetic transmission technology. It employs a magnetic coupling structure with an even number of magnetized poles, smoothly converting rotational motion into axial vibration through alternating repulsive and attractive forces generated between the first and second magnetic components. Compared with existing mechanical conversion devices, this invention completely eliminates rigid contact and friction between moving parts, achieving wear-free and noiseless operation, significantly improving transmission efficiency and equipment lifespan. By connecting multiple sets of second magnetic components in series or adjusting the number of magnetic poles and the magnet diameter, the output power, vibration frequency, and stroke range can be flexibly adjusted to meet different working conditions and support high-speed stable operation. The overall structure is compact and small in size, with wide installation adaptability, and can be widely used in various equipment requiring reciprocating motion, such as electric saws, electric files, electric grinders, electric hammers, and ice skates, offering outstanding advantages such as energy saving, quiet operation, long lifespan, and adjustability.

Description

Technical Field

[0001] This application relates to the field of magnetic transmission technology, and in particular to a magnetic conversion device and method for converting mechanical rotational motion into mechanical axial vibration. Background Technology

[0002] In existing technologies, traditional rotary-reciprocating motion conversion devices mostly adopt mechanical conversion structures, such as crank-connecting rods, eccentric wheels, and cam mechanisms. Although these structures achieve motion conversion to a certain extent, they still have the following shortcomings in practical applications: First, the rigid contact between the kinematic pairs in a purely mechanical conversion structure is prone to wear during long-term operation, affecting the service life and motion accuracy of the device; second, due to the presence of friction and impact, the energy loss during the mechanical conversion process is large, resulting in low transmission efficiency; third, mechanical contact and impact can cause significant operating noise, affecting the user experience and environmental comfort; in addition, traditional mechanical conversion mechanisms often require a large installation space, resulting in a bulky structure that is difficult to adapt to the application requirements of miniaturized and integrated equipment.

[0003] Existing mechanical devices for converting rotary motion to reciprocating motion (such as crank-connecting rods, eccentric wheels, and cam mechanisms) suffer from severe wear of moving parts, high energy loss, high operating noise, and bulky structure. Furthermore, existing devices have limitations in vibration frequency adjustment, stroke control, multi-stage power expansion, and high-speed adaptability, making it difficult to meet the demands of modern industrial equipment for efficient, low-noise, compact, and adjustable transmission methods. Therefore, there is an urgent need for a compact, high-efficiency, wear-free, and low-noise magnetic force conversion device and method to transform mechanical rotary motion into mechanical axial vibration. This device and method can be widely used in mechanical devices that require the conversion of rotary motion to reciprocating motion, such as electric saws, electric files, electric grinders, electric hammers, and ice skates, to transmit the required mechanical energy. Summary of the Invention

[0004] The technical problem this application aims to solve is the shortcomings of existing devices for converting purely mechanical rotary motion into reciprocating motion, such as severe wear of moving parts, high energy loss, high operating noise, and large structural size. To address these shortcomings, this application provides a magnetic force conversion device and method for converting mechanical rotary motion into mechanical axial vibration.

[0005] To solve the above-mentioned technical problems, the technical solution adopted in this application is: A magnetic force conversion device for converting mechanical rotational motion into mechanical axial vibration is constructed, comprising a housing with an opening on one side and an end cap connected to the opening. A sliding assembly is connected to the housing and slidably disposed within the housing. The device also includes a rotating assembly connected to the end cap, a portion of which passes through the end cap and extends into the housing. The rotating assembly includes a rotating shaft and at least one set of first magnetic elements sleeved on the rotating shaft. The first magnetic elements are placed within the housing and rotate synchronously with the rotating shaft. The sliding assembly includes a sliding shell slidably disposed within the housing and at least one set of second magnetic elements connected to and moving synchronously with the sliding shell. The second magnetic elements are disposed opposite to the first magnetic elements. When the rotating shaft drives the first magnetic elements to rotate, the first magnetic elements drive the second magnetic elements to reciprocate along the axial direction of the housing and cause the sliding shell to reciprocate axially within the housing.

[0006] The aforementioned magnetic coupling structure enables contactless flexible transmission, eliminating mechanical wear and operating noise. Furthermore, the vibration frequency and output power can be flexibly adjusted by varying the number of magnetic poles, the diameter of the magnets, and the arrangement of multiple sets in series.

[0007] Preferably, both the first magnetic component and the second magnetic component include alternating first and second magnetic poles. The first magnetic component is radially magnetized on its outer circle, and the second magnetic component is radially magnetized on its inner circle. The first magnetic pole of the first magnetic component and the second magnetic pole of the second magnetic component are aligned in the initial state. When the shaft rotates, alternating repulsive and attractive forces are generated between the first magnetic component and the second magnetic component, driving the sliding shell to reciprocate.

[0008] By using this staggered magnetic pole alignment, the first and second magnetic components generate alternating repulsive and attractive forces with each rotation of the shaft, thus smoothly converting continuous rotational motion into reciprocating linear motion. The motion transition is natural and shock-free, improving the smoothness of motion conversion and response sensitivity.

[0009] Preferably, the outer diameter of the first magnetic component is smaller than the inner diameter of the second magnetic component, and the first and second magnetic components are on the same axis. Both the first and second magnetic components are magnetized with an even number of poles. The number of magnetic poles and the diameter of the magnetic components adjust the vibration frequency and stroke range of the sliding shell.

[0010] Its adjustment principle is as follows: the number of magnetic poles determines the number of times the repulsive and attractive forces generated by the first magnetic component rotate once. The more magnetic poles there are, the higher the magnetic pole switching frequency per unit time, and the corresponding increase in the vibration frequency of the sliding shell. The diameter of the magnetic component affects the range of magnetic force and the magnetic field strength. The larger the diameter, the farther the magnetic force reaches and the stronger the driving force. Under the same magnetic pole configuration, the sliding shell can be pushed to a longer stroke, thereby increasing the vibration stroke and enabling the device to adapt to the working requirements of different working conditions.

[0011] Preferably, the second magnetic element is configured as multiple groups, and the multiple groups of the second magnetic element are connected in series along the axial direction on the inner wall of the sliding shell, with the magnetic poles of adjacent groups of the second magnetic element being staggered and aligned.

[0012] By connecting multiple sets of second magnetic components in series, multiple magnetic poles participate in the magnetic force simultaneously, which can significantly enhance the magnetic coupling driving force and provide greater output power at the same shaft speed, meeting the needs of high-load and high-power application scenarios. At the same time, the synergistic effect of multiple magnetic poles also makes the movement more stable.

[0013] Preferably, the inner wall of the outer shell is provided with a limiting groove along the axial direction, and the outer wall of the sliding shell is provided with a limiting post that is engaged in the limiting groove. The limiting post and the limiting groove are slidably engaged to prevent the sliding shell from rotating.

[0014] By using the sliding fit between the limiting post and the limiting groove, the movement direction of the sliding shell is constrained, ensuring that the sliding shell can only move in a straight line along the axial direction and will not rotate circumferentially. This ensures that the second magnetic component always maintains the correct relative position with the first magnetic component, avoiding failure of magnetic force or movement jamming due to rotation.

[0015] Preferably, the rotating shaft includes a first rotating part, a rotating shaft stop part, and a magnet sleeve part connected in sequence. The first rotating part extends into the housing through the rotating shaft hole on the end cover. The first magnetic element is fixedly disposed on the magnet sleeve part. The radius of the rotating shaft stop part is larger than the radius of the rotating shaft hole to limit the axial position of the rotating shaft.

[0016] By cooperating with the shaft stop and the shaft hole of the end cover, the axial movement of the shaft is limited, preventing the shaft from moving when rotating at high speed or subjected to axial force, ensuring that the axial gap between the first magnetic component and the second magnetic component remains stable, thereby improving the reliability and accuracy of the device operation.

[0017] Preferably, a first bearing is provided between the rotating shaft stop and the end cover. The first bearing is used to reduce the rotational friction between the rotating shaft and the end cover when the rotating shaft rotates. A second bearing is provided between the magnet sleeve and the sliding shell. The second bearing is used to avoid rotational friction between the magnet sleeve and the sliding shell. A third bearing is provided between the sliding shell and the outer shell. The third bearing is used to ensure that the sliding shell and the rotating shaft are coaxially arranged and to reduce sliding friction.

[0018] By incorporating multiple bearings, the friction between rotating and sliding components is transformed from sliding friction to rolling friction, significantly reducing energy loss and improving transmission efficiency. On the other hand, it ensures the coaxiality of all moving parts, making the movement smoother and extending the service life of the device.

[0019] Preferably, the sliding shell has a plug-in portion at one end away from the end cover, and the plug-in portion has a plug-in hole for connecting external working parts.

[0020] The plug-in holes allow for quick connection to various reciprocating motion components such as electric saws, electric files, electric grinders, electric hammers, and ice skates, enabling multi-purpose use and expanding the device's applicability. The plug-in connection method also facilitates the replacement and maintenance of working components, improving ease of use.

[0021] A method for converting mechanical rotational motion into mechanical axial vibration includes the following steps: A housing is provided, wherein a sliding shell is disposed inside the housing and is slidable along the axial direction, and at least one set of second magnetic elements is fixed on the sliding shell; A rotating shaft is rotatably inserted through the outer casing, and at least one set of first magnetic elements is fixed on the rotating shaft, with the first magnetic elements and the second magnetic elements arranged opposite to each other; Drive the rotating shaft to rotate, so that the first magnetic component rotates synchronously with the rotating shaft; The alternating repulsive and attractive forces generated between the first magnetic component and the second magnetic component during the rotation of the first magnetic component drive the sliding shell to reciprocate axially within the outer shell.

[0022] Preferably, the external working component is connected to the insertion part of the sliding shell, so that the reciprocating motion of the sliding shell is transmitted to the external working component, thereby realizing the conversion of rotational motion into axial vibration.

[0023] This application provides a magnetic force conversion device and method for converting mechanical rotational motion into mechanical axial vibration. Through a unique magnetic coupling structure and component layout, it achieves efficient, smooth, and durable motion conversion, and has the following beneficial effects: Regarding the smoothness and controllability of motion transition, this device achieves flexible transmission through the magnetic interaction between the first magnetic component (rotating magnet) and the second magnetic component (sliding magnet). The rotating magnet is magnetized with an even number of poles, and its magnetic poles are alternately aligned with those of the sliding magnet. When the rotating shaft drives the rotating magnet to rotate, the relative positions of the magnetic poles change continuously, causing the sliding magnet to experience alternating repulsive and attractive forces, thereby driving the sliding component to move smoothly back and forth within the outer shell cavity. Compared to traditional mechanical conversion structures, this device has no rigid contact or impact, resulting in smooth motion transition, sensitive response, and the ability to achieve high-frequency, high-speed reciprocating motion.

[0024] In terms of power output, this device offers excellent scalability and adjustability. The sliding magnets can be configured in multiple series, with the first and second magnetic poles of adjacent sliding magnets staggered. Connecting multiple sets of sliding magnets in series significantly enhances the magnetic force, providing greater driving force to meet the demands of high-load conditions. Simultaneously, the rotating and sliding magnets can be magnetized with four, six, or more even-numbered poles. By changing the number of magnetic poles and the magnet diameter, the vibration frequency and stroke range of the device can be flexibly adjusted to adapt to the working requirements of different application scenarios. The vibration stroke can also be mechanically limited by the cooperation of a stop wall inside the housing and an abutment wall on the sliding shell, preventing collisions between the sliding components and the housing and ensuring safe and reliable operation.

[0025] In terms of motion guidance and stability, limit posts are set on both sides of the sliding housing, and corresponding limit grooves are opened on the inner wall of the outer shell. The limit posts are engaged in the limit grooves, effectively preventing the sliding housing from rotating during movement and ensuring that the sliding assembly always moves smoothly back and forth in the axial direction. Bearings are set between the sliding housing and the rotating shaft, and between the sliding housing and the outer shell, which not only ensures coaxiality but also significantly reduces frictional resistance during movement, further improving the smoothness of movement and transmission efficiency.

[0026] In terms of structure and service life, this device adopts magnetic flexible transmission, with no mechanical contact between moving parts. This completely eliminates the wear problems caused by friction and impact in traditional mechanical conversion structures, significantly extending the device's service life. Because there is no rigid contact, almost no noise is generated during operation, making it suitable for noise-sensitive fields such as medical, household, or precision equipment. At the same time, magnetic transmission reduces energy loss, has high transmission efficiency, and provides excellent energy-saving effects.

[0027] In terms of structural compactness and installation adaptability, this device integrates components such as the rotating shaft, rotating magnet, sliding magnet, sliding shell, outer shell, and end cap into one unit. The overall structure is compact and small in size, making it easy to install and use in space-constrained equipment. One end of the rotating shaft extends to the outside to connect to the motor, and one end of the sliding shell is provided with a plug hole, which can be directly connected to working parts such as electric saws, electric files, electric grinders, electric hammers, and ice skates, enabling quick installation and disassembly and adapting to a variety of equipment that requires reciprocating motion.

[0028] In terms of high-speed operation adaptability, since this device adopts non-contact magnetic transmission, there are no problems of mechanical friction, heat generation and wear. It can work continuously and stably under high-speed rotation, meeting the needs of modern industrial equipment for high-frequency reciprocating motion.

[0029] In terms of application scope, this device can be widely used in various mechanical equipment that need to convert rotary motion into reciprocating motion, such as electric saws, electric files, electric grinders, electric hammers, and ice skates. It has good versatility and expandability, and is suitable for the needs of different industries and scenarios. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the present application will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a three-dimensional structural schematic diagram of the magnetic force conversion device according to a preferred embodiment of this application; Figure 2 This is an exploded structural diagram of the magnetic force conversion device according to a preferred embodiment of this application; Figure 3 This is a three-dimensional structural diagram of the outer casing of a preferred embodiment of this application; Figure 4 This is a three-dimensional structural diagram of the end cap according to a preferred embodiment of this application; Figure 5 This is a three-dimensional structural diagram of the connection between the sliding component and the rotating component in a preferred embodiment of this application; Figure 6 This is a three-dimensional structural diagram of the sliding shell according to a preferred embodiment of this application; Figure 7 This is a three-dimensional structural diagram of the sliding shell in another direction, representing a preferred embodiment of this application. Figure 8 This is a three-dimensional structural diagram of the connection between the sliding magnet and the rotating assembly in a preferred embodiment of this application; Figure 9 This is a three-dimensional structural diagram of the rotating shaft according to a preferred embodiment of this application; Figure 10 This is an exploded structural diagram of the sliding magnet and the rotating magnet according to a preferred embodiment of this application; Figure 11 This is a schematic diagram of the sliding magnet and rotating magnet in the initial position according to a preferred embodiment of this application; Figure 12 This is a schematic diagram of the sliding magnet and rotating magnet at the transition position in a preferred embodiment of this application; Figure 13 This is a schematic diagram of the sliding magnet and rotating magnet at the termination position in a preferred embodiment of this application; Figure 14 This is a schematic diagram of the connection between the magnetic force conversion device and the motor in a preferred embodiment of this application. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of this application. Obviously, the described embodiments are some embodiments of this application, but not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this application.

[0032] A preferred embodiment of this application provides a magnetic force conversion device that transforms mechanical rotational motion into mechanical axial vibration; such as... Figures 1-2 As shown, the device includes a housing 2 with an opening on one side, and an end cap 3 connected to the opening. The end cap and housing are locked together by screws 9. A rotating shaft 5 is housed inside the housing. A corresponding rotating shaft hole 300 is provided on the end cap. Part of the rotating shaft passes through the rotating shaft hole and is placed inside the housing, while the other part passes through the rotating shaft hole and is placed outside. A sliding shell 1 is provided between the rotating shaft 5 and the housing 2. A rotating magnet 7, which rotates synchronously with the rotating shaft, is fitted onto the rotating shaft. A sliding magnet 8 is provided on the inner wall of the sliding shell corresponding to the rotating magnet. When the rotating shaft rotates, it drives the rotating magnet to rotate, generating a force between the rotating magnet and the sliding magnet, pushing the sliding magnet to move left and right, and causing the sliding shell to move left and right. This device uses a magnetic coupling drive method, with no contact between the moving parts, achieving flexible transmission, eliminating the wear problems in traditional mechanical structures, and significantly extending the service life of the device. Due to the absence of rigid impact and friction, the device operates almost without noise, making it suitable for noise-sensitive applications.

[0033] Specifically, such as Figure 1-2 , Figures 4-5 , Figures 7-9 and Figure 14As shown, a pivot hole 300 is provided in the middle of end 3. The pivot 5 and the rotating magnet 7 constitute a rotating assembly. The pivot 5 includes a first rotating part 500 that passes through the pivot hole and enters the housing, and a magnet sleeve part 503 connected to the first rotating part. The rotating magnet is fixed on the magnet sleeve part and rotates synchronously with the pivot 5. The first rotating part 500 can be driven to rotate by a motor or other means, which in turn drives the rotating magnet 7 to rotate synchronously. In order to keep the rotating magnet and the pivot 5 rotating synchronously, the magnet sleeve part can be set to be non-circular, thereby ensuring that the pivot 5 drives the rotating magnet to rotate synchronously and at the same speed when the pivot rotates. A shaft stop 501 is also provided between the first rotating part 500 and the magnet sleeve part 503. The radius of the shaft stop is larger than the radius of the shaft hole 300. An end cover chamber 303 is provided on the side of the end cover away from the outer shell. An end cover first inner wall 301 is provided in the end cover chamber. The radius of the end cover first inner wall is larger than the radius of the shaft hole, and the radius of the end cover first inner wall is the same as the radius of the shaft stop. When the shaft passes through the shaft hole, the shaft stop 501 will play a blocking role in the end cover chamber, so that only the first rotating part can pass through the shaft hole. To avoid friction between the shaft and the end cover during rotation, a first outer wall 502 of the shaft is provided between the shaft stop 501 and the first rotating part 500. A second inner wall 302 of the end cover is also provided in the end cover cavity. A bearing 6 is provided between the second inner wall of the end cover and the first outer wall of the shaft. The bearing reduces the rotational friction between the shaft and the end cover. A connecting plate 4 can be provided on the side of the end cover away from the outer shell. The motor 9 is connected through the connecting plate and the motor drives the first rotating part to rotate, which in turn drives the rotating magnet to rotate. At the same time, the connecting plate can also fix the bearing 6 to prevent the bearing from wobbling left and right.

[0034] Furthermore, such as Figures 1-3 and Figures 5-9As shown, a sliding chamber 201 is formed inside the outer shell 2. A sliding assembly consisting of a sliding shell 1 and a sliding magnet 8 is placed inside the sliding chamber, and the shell slides left and right within the sliding chamber. A through hole 203 is provided on the side of the sliding chamber 201 away from the end cover. The sliding shell 1 includes a plug-in part that passes through the through hole. A plug-in hole 105 is provided inside the plug-in part, through which other devices can be connected. When the sliding shell moves left and right, it drives the devices to move left and right to perform their work. Other devices can be equipment such as electric saws, electric files, electric grinders, electric hammers, or ice skates that move back and forth to perform their work. An electric saw will be used as an example later. This device has a wide range of applications and can be used in various devices that require reciprocating motion, such as electric saws, electric files, electric grinders, electric hammers, and ice skates. It has good versatility and expandability. The sliding shell is provided with a sliding shell chamber 101, within which are a first inner wall 102 and a second inner wall 103. The radius of the first inner wall 102 is smaller than the radius of the second inner wall 103. A sliding magnet 8 is fixedly mounted on the second inner wall and rotates synchronously with the sliding shell. A magnet sleeve 503 is inserted into the first inner wall 102, and a bearing 7 is provided between the magnet sleeve and the first inner wall to prevent rotational friction between them. An outer shell first inner wall 202 extends inward from the sliding chamber 201. The radius of the outer shell first inner wall is larger than the radius of the through hole. A bearing 6 can be provided between the outer shell first inner wall and the sliding shell to ensure that the sliding shell and the rotating shaft are coaxial. A stop wall 204 is provided inside the outer shell cavity, and an abutment wall 104 is provided on the outside of the sliding shell corresponding to the stop wall. When the rotating component rotates and pushes the sliding component to the left until the stop wall 204 contacts the abutment wall 104, the sliding component can no longer slide to the left. At this time, the rotating component continues to rotate and pulls the sliding component to the right. As the sliding component continues to rotate, it can be driven to move back and forth in the left and right direction, and then the electric saw moves back and forth left and right to perform the operation. In order to ensure that the sliding component rotates in the left and right direction, the inner walls of the sliding chamber 201 are provided with outwardly recessed limiting grooves 200 on the left and right sides. The sides of the sliding shell are provided with limiting posts 100 that are engaged in the limiting grooves. The limiting posts are engaged in the limiting grooves to prevent the sliding shell from rotating and ensure that the sliding shell moves back and forth in a single direction. This device has a compact structure and small overall size, which is convenient for integration and installation in space-constrained equipment.

[0035] Furthermore, such as Figures 10-13As shown, the rotating magnet 7 employs an outer radial magnetization method, meaning the outer circumferential surface of the circular driving magnet is magnetized with an even number of poles, forming alternating first magnetic poles 800 (N pole) and second magnetic poles 801 (S pole). The sliding magnet 8 employs an inner radial magnetization method, meaning the inner circumferential surface of the annular driven magnet is magnetized with the same number of even poles, similarly forming alternating first and second magnetic poles. In the initial state, the first magnetic pole 800 of the rotating magnet 7 is aligned with the second magnetic pole 801 of the sliding magnet 8, as shown... Figure 11 The initial position is shown. When the motor drives the rotating shaft 5 to rotate and causes the rotating magnet to rotate, the magnetic force will change. Due to the rotation of the rotating magnet, the first magnetic pole of the rotating magnet and the second magnetic pole of the sliding magnet become misaligned. At this time, the area of ​​alignment between the first magnetic pole of the rotating magnet and the second magnetic pole of the sliding magnet is larger than the area of ​​alignment between the first magnetic pole of the rotating magnet and the first magnetic pole of the sliding magnet. In order to maintain magnetic balance, a repulsive force is generated between the rotating magnet and the sliding magnet, which pushes the sliding magnet 8 to move to the left. Figure 12 The transition state shown then causes the sliding shell 1 to move to the left within the outer shell cavity. At this time, the electric saw will move to the left along with the sliding shell. As the shaft continues to rotate, the misalignment between the first magnetic pole of the rotating magnet and the second magnetic pole of the sliding magnet increases. When the aligned area between the first magnetic pole of the rotating magnet and the second magnetic pole of the sliding magnet is smaller than the aligned area between the first magnetic pole of the rotating magnet and the first magnetic pole of the sliding magnet, the sliding magnet will continue to move to the left, causing the sliding shell to move to the left. When the maximum repulsive force is reached, the abutment wall of the sliding shell contacts the stop wall, such as... Figure 13 The shown termination position indicates that the sliding shell has reached its maximum leftward travel and achieved a new equilibrium. As rotation continues, the rotating magnet begins to attract the sliding magnet, pulling it to the right and causing the sliding shell to move to the right. The chainsaw will then move to the right along with the sliding shell. The continuous rotation of the shaft drives the rotating magnet to rotate continuously, causing the repulsive and attractive forces between the rotating magnet 7 and the sliding magnet 8 to alternate, creating a vibration state that drives the chainsaw to move back and forth. Magnetic transmission reduces energy loss, has high transmission efficiency, and exhibits significant energy-saving effects. Furthermore, due to its contactless and frictionless characteristics, this device supports high-speed operation and can work stably at high speeds. The core structure of this device consists of: the rotating magnet 7 being a circular driving magnet, using an outer radial magnetization method; and the sliding magnet 8 consisting of two annular driven magnets, using an inner radial magnetization method. The two annular sliding magnets are connected in series along the axial direction and alternately placed 180 degrees apart. The outer diameter of the circular rotating magnet is smaller than the inner diameter of the two annular driven magnets. When static, the circular rotating magnet is attracted to the interior of either of the two annular sliding magnets, and each is constrained to the same axis. Therefore, the inner surfaces do not contact each other, realizing contactless flexible transmission.

[0036] Furthermore, such as Figure 10 As shown, the sliding magnet 8 can also be configured as multiple groups (two or more). When configured as multiple groups, adjacent groups of sliding magnets are magnetized using the same even number of poles, i.e., half of the inner circle of the sliding magnet is magnetized as the first pole, and the other half is magnetized as the second pole. During configuration, the first pole of the first group of sliding magnets is aligned with the second pole of the second sliding magnet. Multiple groups of sliding magnets can be connected in series as needed, maintaining the alignment of the first and second poles of adjacent magnets, thereby providing greater power to drive the sliding magnets to move back and forth. By setting multiple groups of sliding magnets and maintaining the staggered alignment of adjacent poles, multi-stage series drive is achieved, significantly improving output power and meeting the power requirements under different operating conditions. Simultaneously, the rotating and sliding magnets can be magnetized using an even-numbered multi-stage method with 4 or 6 poles. However, the first and second poles of both the rotating and sliding magnets are staggered. The first pole of the rotating magnet is aligned with the second pole of the first group of sliding magnets, and the first pole of adjacent sliding magnets is aligned with the second pole of their adjacent counterpart. This allows for changes in the needle's vibration frequency and stroke by varying the number of sliding magnets or the number of poles used for magnetization. It's important to note that the vibration stroke setting must consider the distance between the stop wall and the contact wall to prevent impact between the sliding shell and the outer shell. The adjustment principle is as follows: the number of magnetic poles determines the number of repulsive and attractive forces generated per revolution of the rotating magnet. A higher number of poles results in a higher pole switching frequency per unit time, correspondingly increasing the vibration frequency of the sliding shell. The diameter of the magnetic component affects the magnetic field range and strength; a larger diameter results in a longer magnetic field distance and a stronger driving force, allowing the sliding shell to travel a greater distance with the same pole configuration, thus increasing the vibration stroke. By increasing the diameter of the rotating and sliding magnets or adjusting the number of magnetic poles, the vibration frequency and stroke of the device can be flexibly adjusted to adapt to various application scenarios.

[0037] To facilitate the description of the transformation process, this is illustrated using two sets of sliding magnets and one set of rotating magnets, with two poles magnetized. The specific working process is as follows: In the initial position, the sliding magnet 8 is radially magnetized from the inner circle, with the two sliding magnets placed 180 degrees apart. The rotating magnet 7 is radially magnetized from the outer circle. In the initial state, the first magnetic pole 800 of the rotating magnet 7 is aligned with the second magnetic pole 801 of the sliding magnet 8, the magnetic forces are in equilibrium, and the attraction between the rotating magnet and the sliding magnet is at its maximum. The rotating magnet is attracted to the interior of either of the two rotating magnets, each constrained to the same axis, with no contact between their inner surfaces.

[0038] During the rotation of the rotating magnet from 0 degrees to 90 degrees clockwise, when the motor 9 starts and drives the rotating shaft 5 to rotate, the rotating shaft 5 drives the rotating magnet 7 to rotate clockwise synchronously from 0 degrees. During the rotation to 90 degrees, the position of the magnetic poles of the rotating magnet 7 relative to the magnetic poles of the sliding magnet 8 changes continuously. Since both the rotating magnet 7 and the sliding magnet 8 are magnetized with an even number of poles and the magnetic poles are staggered, when the rotating magnet 7 rotates, its first magnetic pole 800 gradually approaches the first magnetic pole 800 of the sliding magnet 8. The first set of sliding magnets 8 is subjected to a repulsive force, and the second set of sliding magnets 8 is subjected to an attractive force, which together pushes the sliding magnet 8 and the sliding shell 1 to move to the left along the axial direction. When the rotating magnet rotates to 90 degrees, the force of the rotating magnet on the sliding magnet approaches zero, completing half of the leftward movement. At this time, the limiting posts 100 on both sides of the sliding shell 1 slide within the limiting grooves 200 of the outer shell 2, ensuring that the sliding shell 1 only moves in a straight line and does not rotate.

[0039] As the rotating magnet rotates from 90 degrees clockwise to 180 degrees, the relative positions between the rotating magnet 7 and the sliding magnet 8 change further as the rotating shaft 5 continues to rotate. When the aligned area between the first magnetic pole 800 of the rotating magnet 7 and the second magnetic pole 801 of the sliding magnet 8 gradually decreases, while the aligned area between the first magnetic pole 800 of the rotating magnet 7 and the first magnetic pole 800 of the sliding magnet 8 gradually increases, the first set of sliding magnets 8 continues to experience a repulsive force, and the second set of sliding magnets 8 continues to experience an attractive force, jointly propelling the sliding magnet and the sliding shell 1 to continue moving to the left. When the rotating magnet rotates to 180 degrees, and the first magnetic pole 800 of the rotating magnet 7 is completely misaligned with the second magnetic pole 801 of the sliding magnet 8, and the first magnetic pole 800 of the rotating magnet 7 is completely aligned with the first magnetic pole 800 of the sliding magnet 8, the attractive force of the rotating magnet on the sliding magnet reaches its maximum value. The sliding magnet 8 and the sliding shell 1 move to the left to their extreme position, and their contact wall 104 contacts the stop wall 204 inside the outer shell 2, completing the leftward stroke.

[0040] As the rotating magnet rotates clockwise from 180 degrees to 270 degrees, the rotating shaft 5 continues to rotate. The first magnetic pole 800 of the rotating magnet 7 gradually shifts away from the first magnetic pole 800 of the sliding magnet 8, while the second magnetic pole 801 of the rotating magnet 7 gradually approaches the first magnetic pole 800 of the sliding magnet 8. The second set of sliding magnets 8 experiences a repulsive force, while the first set experiences an attractive force, jointly propelling the sliding magnets 8 and the sliding shell 1 to the right. When the rotating magnet reaches 270 degrees, the alignment area between the second magnetic pole 801 of the rotating magnet 7 and the first magnetic pole 800 of the sliding magnet 8 is at its maximum, and the force exerted by the rotating magnet 7 on the sliding magnet 8 approaches zero. The sliding shell 1 then moves to the right to the halfway point of its stroke.

[0041] As the rotating magnet rotates clockwise from 270 degrees to 360 degrees, the relative positions between the rotating magnet 7 and the sliding magnet 8 change further as the rotating shaft 5 continues to rotate. When the aligned area between the first magnetic pole 800 of the rotating magnet 7 and the second magnetic pole 801 of the sliding magnet 8 gradually decreases, while the aligned area between the first magnetic pole 800 of the rotating magnet 7 and the first magnetic pole 800 of the sliding magnet 8 gradually increases, the second set of sliding magnets 8 continues to experience a repulsive force, while the first set of sliding magnets 8 continues to experience an attractive force, jointly propelling the sliding magnet and the sliding shell 1 to continue moving to the right. When the rotating magnet rotates to 360 degrees (i.e., returns to the initial 0-degree position), and the rotating magnet 7 rotates until its first magnetic pole 800 is completely misaligned with the second magnetic pole 801 of the sliding magnet 8, and its first magnetic pole 800 is completely aligned with the first magnetic pole 800 of the sliding magnet 8, the attractive force of the rotating magnet on the sliding magnet reaches its maximum value. The sliding magnet 8 and the sliding shell 1 then move to their extreme rightward position, completing their rightward journey.

[0042] The rotating shaft 5 rotates continuously, and the above five steps are repeated cyclically, causing repulsive and attractive forces to alternate, driving the sliding shell 1 to make periodic left-right reciprocating motions within the outer shell 2, thereby smoothly converting rotational motion into axial vibration. The insertion hole 105 of the sliding shell 1 connects to external working parts (such as chainsaw chains, files, electric hammer heads, or ice skates), driving them to perform high-frequency reciprocating operations to complete processes such as cutting, filing, impacting, or planing.

[0043] Based on the above-described apparatus, this application also provides a method for converting mechanical rotational motion into mechanical axial vibration, comprising the following steps: Step S1: Provide a housing 2, and provide a sliding shell 1 that can slide along the axial direction inside the housing 2. A sliding magnet 8 is fixedly provided inside the sliding shell 1. A rotating shaft 5 is rotatably inserted through the housing 2. A rotating magnet 7 opposite to the sliding magnet 8 is fixedly provided on the rotating shaft 5. Both the rotating magnet 7 and the sliding magnet 8 are magnetized with an even number of poles and the magnetic poles are arranged alternately.

[0044] Step S2: Drive the rotating shaft 5 to rotate, causing the rotating magnet 7 to rotate synchronously; Step S3: Utilize the alternating repulsive and attractive forces generated between the rotating magnet 7 and the sliding magnet 8 during the rotation process to drive the sliding shell 1 to reciprocate axially within the outer shell 2; Step S4: Connect the external working component through the insertion hole 105 of the sliding shell 1 to transmit the reciprocating motion to the working component, thereby realizing the conversion of rotational motion into axial vibration.

[0045] The above method also includes adjusting the output power, vibration frequency and stroke range by connecting multiple sets of sliding magnets 8 in series or adjusting the number of magnetic poles and the diameter of the rotating magnet 7 and the sliding magnet 8; and preventing the sliding shell 1 from rotating by the cooperation of the limiting post 100 and the limiting groove 200, and limiting the maximum stroke of the sliding shell 1 by the cooperation of the abutment wall 104 and the stop wall 204.

[0046] It should be understood that this application has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this application. Furthermore, based on the teachings of this application, these features and embodiments can be modified to suit specific circumstances and materials without departing from the spirit and scope of this application. Therefore, this application is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this application.

Claims

1. A magnetic force conversion device for converting mechanical rotational motion into mechanical axial vibration, comprising a housing, an opening on one side of the housing, an end cap connected to the opening, a sliding assembly connected to the housing, the sliding assembly being slidably disposed within the housing, and a rotating assembly connected to the end cap, a portion of the rotating assembly passing through the end cap and extending into the housing, characterized in that: The rotating assembly includes a rotating shaft and at least one set of first magnetic elements sleeved on the rotating shaft. The first magnetic elements are placed inside the housing and rotate synchronously with the rotating shaft. The sliding assembly includes a sliding shell slidably disposed inside the housing and at least one set of second magnetic elements connected to the sliding shell and moving synchronously. The second magnetic elements are disposed opposite to the first magnetic elements. When the rotating shaft drives the first magnetic elements to rotate, the first magnetic elements drive the second magnetic elements to reciprocate along the axial direction of the housing and drive the sliding shell to reciprocate along the axial direction inside the housing.

2. The magnetic force conversion device according to claim 1, characterized in that: Both the first magnetic component and the second magnetic component include alternating first and second magnetic poles. The first magnetic component is radially magnetized on its outer circle, and the second magnetic component is radially magnetized on its inner circle. The first magnetic pole of the first magnetic component and the second magnetic pole of the second magnetic component are aligned in the initial state. When the shaft rotates, alternating repulsive and attractive forces are generated between the first magnetic component and the second magnetic component, driving the sliding shell to reciprocate.

3. The magnetic force conversion device according to claim 2, characterized in that: The outer diameter of the first magnetic component is smaller than the inner diameter of the second magnetic component, and the first and second magnetic components are on the same axis. Both the first and second magnetic components are magnetized with an even number of poles. The number of magnetic poles and the diameter of the magnetic components adjust the vibration frequency and stroke range of the sliding shell.

4. The magnetic force conversion device according to claim 1, characterized in that: The second magnetic element is configured in multiple groups, and the multiple groups of the second magnetic element are connected in series along the axial direction on the inner wall of the sliding shell, with the magnetic poles of adjacent groups of the second magnetic element being staggered and aligned.

5. The magnetic force conversion device according to any one of claims 1-4, characterized in that: The inner wall of the outer shell is provided with a limiting groove along the axial direction, and the outer wall of the sliding shell is provided with a limiting post that is inserted into the limiting groove. The limiting post and the limiting groove are slidably engaged to prevent the sliding shell from rotating.

6. The magnetic force conversion device according to claim 5, characterized in that: The rotating shaft includes a first rotating part, a rotating shaft stop part, and a magnet sleeve part connected in sequence. The first rotating part extends into the housing through the rotating shaft hole on the end cover. The first magnetic element is fixedly disposed on the magnet sleeve part. The radius of the rotating shaft stop part is larger than the radius of the rotating shaft hole to limit the axial position of the rotating shaft.

7. The magnetic force conversion device according to claim 6, characterized in that: A first bearing is provided between the rotating shaft stop and the end cover. The first bearing is used to reduce the rotational friction between the rotating shaft and the end cover when the rotating shaft rotates. A second bearing is provided between the magnet sleeve and the sliding shell. The second bearing is used to avoid the generation of rotational friction between the magnet sleeve and the sliding shell. A third bearing is provided between the sliding shell and the outer shell. The third bearing is used to ensure that the sliding shell and the rotating shaft are coaxially arranged and to reduce sliding friction.

8. The magnetic force conversion device according to claim 1, characterized in that: The sliding shell has a plug-in portion at one end away from the end cover, and the plug-in portion has a plug-in hole for connecting external working parts.

9. A method for converting mechanical rotational motion into mechanical axial vibration, characterized in that, Includes the following steps: A housing is provided, wherein a sliding shell is disposed inside the housing and is slidable along the axial direction, and at least one set of second magnetic elements is fixed on the sliding shell; A rotating shaft is rotatably inserted through the outer casing, and at least one set of first magnetic elements is fixed on the rotating shaft, with the first magnetic elements and the second magnetic elements arranged opposite to each other; Drive the rotating shaft to rotate, so that the first magnetic component rotates synchronously with the rotating shaft; The alternating repulsive and attractive forces generated between the first magnetic component and the second magnetic component during the rotation of the first magnetic component drive the sliding shell to reciprocate axially within the outer shell.

10. The method according to claim 9, characterized in that: The external working component is connected to the insertion part of the sliding shell, so that the reciprocating motion of the sliding shell is transmitted to the external working component, realizing the conversion of rotational motion into axial vibration.

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