Self-protecting synchronous permanent magnet coupling

Abstract

The application discloses a self-protecting synchronous permanent magnet coupling, which comprises an outer shaft sleeve and a transmission medium, the outer shaft sleeve is used for connecting a speed reducer shaft; an inner shaft sleeve is arranged at one end of the outer shaft sleeve along an axial direction, the inner shaft sleeve is used for connecting a motor shaft, and a first plug-in hole is formed in the inner shaft sleeve along the axial direction; a permanent magnet coupling main body is coaxially arranged at the end of the outer shaft sleeve which faces the inner shaft sleeve, the permanent magnet coupling main body is rotatably arranged in the inner shaft sleeve along the axial direction, and the permanent magnet coupling main body is provided with a second plug-in hole at a position corresponding to the first plug-in hole; the transmission medium is detachably connected to the first plug-in hole and the second plug-in hole; the permanent magnet coupling main body has an overload protection state of decoupling when the torque reaches a first maximum torque, the transmission medium has a split state of being broken into a first part and a second part when the torque reaches a second maximum torque, and the first maximum torque is greater than the second maximum torque. The application can avoid reducing the performance of the permanent magnet coupling main body by being in the overload protection state for a long time.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet coupling technology, and specifically to a self-protected synchronous permanent magnet coupling. Background Technology

[0002] Synchronous permanent magnet couplings are couplings that utilize rare-earth permanent magnet magnetic fields for magnetic levitation and air-isolation transmission. Their advantages, such as synchronous transmission, vibration isolation, shock elimination, overload protection, and maintenance-free operation, have been recognized by customers in the industry and are now widely used in the steel, coal, cement, energy, and chemical industries.

[0003] Currently, in many operating conditions, the main requirements for synchronous permanent magnet couplings are their advantages in synchronous transmission, vibration isolation, shock elimination, and maintenance-free operation, thereby improving production efficiency, extending equipment lifespan, and reducing maintenance costs. Traditional synchronous permanent magnet couplings typically utilize the decoupling of the inner and outer rotor magnets when the torque reaches its maximum value, preventing torque transmission. While this effectively protects the lifespan of the load equipment during overload, the reaction time from overload occurrence to fault resolution is relatively long, and prolonged overload conditions degrade the performance of the synchronous permanent magnet coupling. Summary of the Invention

[0004] Therefore, the present invention provides a self-protected synchronous permanent magnet coupling to solve the problem that the existing synchronous permanent magnet coupling can only achieve overload protection by decoupling the inner rotor magnet and the outer rotor magnet, which leads to a reduction in the performance of the synchronous permanent magnet coupling under long-term overload conditions.

[0005] This invention provides a self-protected synchronous permanent magnet coupling, comprising:

[0006] Outer bushing, used to connect either the drive shaft or the load shaft;

[0007] An inner bushing is used to connect the other of the drive shaft and the load shaft. The inner bushing is spaced at one end of the outer bushing along the axial direction. A first insertion hole is formed through the inner bushing along the axial direction.

[0008] The permanent magnet coupling body is coaxially disposed at one end of the outer bushing facing the inner bushing along the axial direction. The permanent magnet coupling body is rotatably disposed on the inner bushing around the axial direction. The permanent magnet coupling body is provided with a second insertion hole corresponding to the position of the first insertion hole.

[0009] The transmission medium is detachably connected to the first insertion hole and the second insertion hole;

[0010] The permanent magnet coupling body has an overload protection state that decouples when the torque reaches the first maximum torque. The transmission medium has a split state that breaks into a first part and a second part when the torque reaches the second maximum torque. The first part is disposed in the first insertion hole, and the second part is disposed in the second insertion hole. The first maximum torque is greater than the second maximum torque.

[0011] According to the present invention, a self-protected synchronous permanent magnet coupling has at least the following technical advantages:

[0012] By axially rotating the permanent magnet coupling body within the inner bushing, and providing a second insertion hole corresponding to the first insertion hole on the permanent magnet coupling body, a transmission medium is inserted into both the first and second insertion holes to link the permanent magnet coupling body and the inner bushing together to transmit torque. The first maximum torque is greater than the second maximum torque. This design leverages the synchronous transmission, vibration isolation, shock elimination, and maintenance-free performance advantages of the permanent magnet coupling body. Furthermore, it utilizes the characteristic that the transmission medium breaks into a first and a second part when the torque reaches the second maximum torque. Before the permanent magnet coupling body enters the overload protection state, the transmission medium first enters a split state, cutting off torque transmission between the inner bushing and the permanent magnet coupling body (i.e., cutting off torque transmission between the inner and outer bushings). This ensures that the power source is cut off through the transmission medium before the permanent magnet coupling body enters the overload protection state, achieving self-protection and overload protection for this synchronous permanent magnet coupling, and preventing prolonged overload protection from degrading the performance of the permanent magnet coupling body. Meanwhile, by detachably connecting the transmission medium to the first and second insertion holes, on the one hand, after the transmission medium breaks and forms the first and second parts, it is easy to remove the first and second parts from the first and second insertion holes respectively, so as to replace the new transmission medium; on the other hand, it is easy to replace the transmission medium with the corresponding second maximum torque according to different operating conditions, thus having a wide range of applications.

[0013] In one alternative embodiment, a plurality of transmission media are provided, and the plurality of transmission media are evenly distributed at circumferential intervals.

[0014] In one optional embodiment, a limiting portion is provided at one end of the transmission medium, the limiting portion being used to abut against the end face of the inner bushing that is axially away from the outer bushing.

[0015] In one alternative embodiment, the transmission medium is interference-fitted with the first insertion hole, and the transmission medium is interference-fitted with the second insertion hole.

[0016] In one optional embodiment, the permanent magnet coupling body includes:

[0017] The first carrier is coaxially disposed at one end of the outer bushing facing the inner bushing;

[0018] An outer rotor magnet is disposed on the inner circumferential surface of the first carrier;

[0019] The second carrier is rotatably connected to the outer peripheral surface of the portion of the inner bushing that extends into the first carrier, and the second insertion hole is provided on the end face of the second carrier facing the inner bushing;

[0020] An inner rotor magnet is disposed on the outer peripheral surface of the second carrier. The inner rotor magnet is disposed correspondingly to the outer rotor magnet, and an air gap is disposed between the inner rotor magnet and the outer rotor magnet in the radial direction.

[0021] In one optional embodiment, the inner bushing includes a connecting sleeve and a supporting sleeve. The connecting sleeve is used to connect to the drive shaft. A connecting ring is radially protruding from the outer circumferential surface of the connecting sleeve. The first insertion hole is disposed on the connecting ring. The connecting ring and the second carrier are axially spaced apart. The supporting sleeve is coaxially connected to one end of the connecting sleeve facing the outer bushing. The end of the supporting sleeve away from the connecting sleeve is connected to the interior of the second carrier through a bearing.

[0022] In one alternative embodiment, the connecting cylinder is detachably connected to the support sleeve via a first connecting assembly.

[0023] In one optional embodiment, the outer side wall of the second carrier is provided with a process hole in the radial direction, and the process hole communicates with the second insertion hole.

[0024] In one optional embodiment, the outer sidewall of the end of the first carrier away from the outer bushing is configured as an outer conical surface, the outer conical surface extending axially away from the outer bushing and gradually inclined radially towards the axis of the first carrier; the outer peripheral surface of the second carrier is axially slidably fitted with a mounting locking sleeve, the mounting locking sleeve being locked by a locking assembly, the inner sidewall of the end of the mounting locking sleeve facing the first carrier axially is configured as an inner conical surface, the inner conical surface matching the outer conical surface; the permanent magnet coupling body has a closed state in which the inner conical surface and the outer conical surface abut against each other, and an operating state in which the inner conical surface and the outer conical surface are disengaged.

[0025] In some alternative embodiments, a dustproof element is provided between the inner circumferential surface of the end of the second carrier that is axially opposite to the outer bushing and the outer circumferential surface of the support sleeve. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of this embodiment, showing the main body of a permanent magnet coupling in the closed state.

[0028] Figure 2 This is a schematic diagram of the structure of this embodiment, showing the main body of a permanent magnet coupling in operation.

[0029] Figure 3 This is a sectional side view of a portion of the structure in this embodiment.

[0030] Explanation of reference numerals in the attached figures:

[0031] 100 - outer bushing, 110 - mounting ring;

[0032] 200-Inner bushing, 210-Connecting sleeve, 211-Connecting ring, 220-Support sleeve, 221-Bearing, 222-Second limiting element;

[0033] 300 - Transmission medium; 310 - Limiting part;

[0034] 410-First carrier, 411-Outer conical surface, 412-Mounting plate, 413-Mounting cylinder, 420-Outer rotor magnet, 430-Second carrier, 431-Process hole, 432-Dustproof element, 433-First limiting element, 440-Inner rotor magnet;

[0035] 500 - Install locking sleeve, 510 - Fastening bolt. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this embodiment, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this embodiment. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this embodiment, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment according to the specific circumstances.

[0039] The following is combined Figures 1 to 3 The following describes embodiments of the present invention.

[0040] According to an embodiment of the present invention, a self-protected synchronous permanent magnet coupling coupling includes an outer bushing 100 and a transmission medium 300. The outer bushing 100 is used to connect a load shaft, preferably a reducer shaft. An inner bushing 200 is spaced at one end of the outer bushing 100 along the axial direction. The inner bushing 200 is used to connect a drive shaft, preferably a motor shaft. A first insertion hole is formed through the inner bushing 200 along the axial direction. A permanent magnet coupling coupling body is coaxially disposed at one end of the outer bushing 100 facing the inner bushing 200 along the axial direction. The permanent magnet coupling coupling body is rotatably disposed on the outer bushing 100. The inner bushing 200 has a second insertion hole corresponding to the position of the first insertion hole on the main body of the permanent magnet coupling. The transmission medium 300 is detachably connected to the first insertion hole and the second insertion hole. The main body of the permanent magnet coupling has an overload protection state that causes the inner rotor magnet 440 and the outer rotor magnet 420 to decouple when the torque reaches the first maximum torque. The transmission medium 300 has a split state that breaks into a first part and a second part when the torque reaches the second maximum torque. The first part is located in the first insertion hole, and the second part is located in the second insertion hole. The first maximum torque is greater than the second maximum torque.

[0041] This embodiment of the self-protected synchronous permanent magnet coupling coupling involves axially rotating the main body of the permanent magnet coupling coupling within the inner bushing 200. The main body has a second insertion hole corresponding to the first insertion hole. A transmission medium 300 is inserted into both the first and second insertion holes to link the main body and the inner bushing 200 together for torque transmission. The first maximum torque is greater than the second maximum torque. This design leverages the synchronous transmission, vibration isolation, shock elimination, and maintenance-free performance advantages of the permanent magnet coupling coupling, while also utilizing the characteristic that the transmission medium 300 breaks into a first and a second part when the torque reaches the second maximum torque. This ensures that the transmission medium is protected before the main body enters an overload protection state. The moving medium 300 first enters the split state, cutting off the torque transmission between the inner bushing 200 and the permanent magnet coupling body (i.e., cutting off the torque transmission between the inner bushing 200 and the outer bushing 100). This ensures that the power source is cut off through the transmission medium 300 before the permanent magnet coupling body enters the overload protection state, thus achieving self-protection and overload protection of the self-protected synchronous permanent magnet coupling in this embodiment. This avoids the performance of the permanent magnet coupling body being reduced due to prolonged overload protection. It is particularly suitable for applications where only synchronous transmission, vibration isolation, shock elimination, and maintenance-free performance of the permanent magnet coupling body are required, without needing the permanent magnet coupling body to enter the overload protection state to achieve overload protection. Meanwhile, by detachably connecting the transmission medium 300 to the first insertion hole and the second insertion hole, on the one hand, after the transmission medium 300 breaks to form the first part and the second part, it is convenient to remove the first part and the second part from the first insertion hole and the second insertion hole respectively, so as to replace the new transmission medium 300; on the other hand, it is convenient to replace the transmission medium 300 with the corresponding second maximum torque according to different operating conditions, which has a wide range of applications.

[0042] It should be noted that the second maximum torque corresponding to the transmission medium 300 made of different materials is different when switching to the split state. Therefore, by adaptively selecting, the transmission medium 300 made of the corresponding material can be detachably connected to the first insertion hole and the second insertion hole to meet different operating conditions.

[0043] It should be noted that because this embodiment can promptly achieve self-protection and overload protection when the torque reaches the second maximum torque, the permanent magnet coupling body can be prevented from being in an overload protection state during the period from the occurrence of overload to the troubleshooting, thereby avoiding the performance reduction of the permanent magnet coupling body due to being in an overload protection state for a long time.

[0044] It should be noted that, in this embodiment, because the permanent magnet coupling body can be rotatably mounted on the inner bushing 200 around the axial direction, the motor shaft and the inner bushing 200 still maintain synchronous rotation after the transmission medium 300 is switched to the split state; and the reducer shaft, the outer bushing 100 and the permanent magnet coupling body are in a stopped state.

[0045] It is understandable that the first maximum torque is greater than the second maximum torque, and the first maximum torque is less than the motor overload torque or the motor stall torque. This ensures that in the special situation where the transmission medium 300 cannot switch to the split state in time under any torque, when the torque exceeds the second maximum torque and rises to the first maximum torque, the permanent magnet coupling body can switch to the overload protection state, forming two overload protection defense lines, which is beneficial to improving the self-protection and overload protection performance of this embodiment.

[0046] It is understood that the outer bushing 100, the permanent magnet coupling body, and the inner bushing 200 are coaxially arranged. The axial direction mentioned in the text refers to the axial direction of the outer bushing 100, and the radial direction refers to the radial direction of the outer bushing 100. For ease of description, [the text continues with further details about the outer bushing 100 and its radial direction]. Figure 1 The axial and radial directions are described as axial and radial.

[0047] In practical applications, the outer bushing 100 can be connected to the motor shaft, and the inner bushing 200 can be connected to the reducer shaft.

[0048] In specific applications, the transmission medium 300 can be configured as one of the following: elastic pin structure, diaphragm structure, or bolt structure.

[0049] To ensure uniform and smooth transmission of torque between the permanent magnet coupling body and the inner bushing 200, in some embodiments, multiple transmission media 300 are provided, preferably eight, and the eight transmission media 300 are evenly distributed circumferentially.

[0050] In specific applications, the number of transmission medium 300 can be reasonably increased or decreased according to the cross section of the inner bushing 200 perpendicular to the axial direction or the magnitude of the transmitted torque. For example, in other embodiments, the number of transmission medium 300 is set to two, three, four, five, etc.

[0051] like Figure 1 and Figure 2 As shown, in some embodiments, a limiting portion 310 is provided at one end of the transmission medium 300. The limiting portion 310 is used to abut against the end face of the inner bushing 200 that is axially opposite to the outer bushing 100. During the process of assembling the transmission medium 300 into the first insertion hole and the second insertion hole, the limiting function of the limiting portion 310 ensures that the transmission medium 300 is assembled into the set position in the first insertion hole and the second insertion hole, thereby ensuring that the torque is transmitted evenly and smoothly between the permanent magnet coupling body and the inner bushing 200. At the same time, the limiting portion 310 can also provide a force application position so as to remove the first part from the first insertion hole.

[0052] In some embodiments, the transmission medium 300 is interference-fitted with the first insertion hole and the transmission medium 300 is interference-fitted with the second insertion hole. This configuration allows the transmission medium 300 to be detachably connected to both the first and second insertion holes, while preventing the transmission medium 300 from dislodging from the second insertion hole during operation, thus ensuring the smooth operation of this embodiment.

[0053] In specific applications, an internal thread can be provided on the inner wall of the first insertion hole, and an external thread can be provided on the outer circumferential surface of the portion of the transmission medium 300 that is assembled in the first insertion hole. The external thread and the internal thread are matched. The end of the transmission medium 300 facing the permanent magnet coupling body is interference-fitted with the second insertion hole. The transmission medium 300 is assembled in the first insertion hole through the threaded engagement of the external thread and the internal thread, which is more conducive to preventing the transmission medium 300 from coming out of the second insertion hole due to external factors such as vibration.

[0054] like Figure 1 and Figure 2 As shown, in some embodiments, the permanent magnet coupling body includes:

[0055] The first carrier 410 is coaxially disposed at one end of the outer bushing 100 facing the inner bushing 200;

[0056] An outer rotor magnet 420 is disposed on the inner circumferential surface of the first carrier 410;

[0057] The second carrier 430 is rotatably connected to the outer peripheral surface of the portion of the inner bushing 200 extending into the first carrier 410 and is coaxially arranged with the first carrier 410. The second insertion hole is provided on the end face of the second carrier 430 facing the inner bushing 200.

[0058] An inner rotor magnet 440 is disposed on the outer peripheral surface of the second carrier 430. The inner rotor magnet 440 is disposed correspondingly to the outer rotor magnet 420. An air gap is disposed between the inner rotor magnet 440 and the outer rotor magnet 420 in the radial direction.

[0059] In this embodiment, the second carrier 430 is axially rotatably connected to the inner bushing 200. The outer circumferential surface of the second carrier 430 is provided with an inner rotor magnet 440, and the inner circumferential surface of the first carrier 410 is provided with an inner rotor magnet 440 at a position corresponding to the outer rotor magnet 420. The magnetic attraction between the inner rotor magnet 440 and the outer rotor magnet 420 is used to transmit torque. Therefore, when the transmission medium 300 is switched to the split state, the magnetic attraction prevents the second carrier 430 from rotating axially relative to the first carrier 410. This allows the inner bushing 200 to rotate axially inside the second carrier 430 under the drive of the motor shaft, ensuring that the motor shaft and the inner bushing 200 maintain synchronous rotation after the transmission medium 300 is switched to the split state. Furthermore, the reducer shaft, the outer bushing 100, and the permanent magnet coupling body are in a stopped state.

[0060] It should be noted that the inner bushing 200, the second carrier 430 and the first carrier 410 are coaxially arranged to ensure that the air gap A between the inner rotor magnet 440 and the outer rotor magnet 420 is consistent at all positions along the circumference.

[0061] It should be noted that the outer rotor magnet 420 and the inner rotor magnet 440 are respectively arranged on the first carrier 410 and the second carrier 430. The magnetic circuit adopts an alternating arrangement of NS magnetic poles or a Halbach array structure. There is an air gap A between the outer rotor magnet 420 and the inner rotor magnet 440, and the torque and speed are transmitted by magnetic attraction.

[0062] Understandably, in the special situation where the transmission medium 300 cannot switch to the split state in time under any torque, when the torque exceeds the second maximum torque and rises to the first maximum torque, the inner rotor magnet 440 and the outer rotor magnet 420 decouple and cannot transmit torque, causing the permanent magnet coupling body to switch to the overload protection state. At this time, the motor shaft, inner bushing 200, second carrier 430 and inner rotor magnet 440 still maintain synchronous rotation, while the reducer shaft, outer bushing 100, first carrier 410 and outer rotor magnet 420 are in a stopped state, forming two overload protection defense lines, which is beneficial to improving the self-protection and overload protection performance of this embodiment.

[0063] like Figure 1 and Figure 2As shown, in some embodiments, the inner bushing 200 includes a connecting sleeve 210 and a supporting sleeve 220. The connecting sleeve 210 is used to connect the motor shaft. A connecting ring 211 is radially protruding on the outer circumferential surface of the connecting sleeve 210. The first insertion hole is disposed on the connecting ring 211. The connecting ring 211 and the second carrier 430 are axially spaced apart. The supporting sleeve 220 is coaxially connected to one end of the connecting sleeve 210 facing the outer bushing 100. The end of the supporting sleeve 220 away from the connecting sleeve 210 is connected to the interior of the second carrier 430 through a bearing 221. By arranging the connecting ring 211 and the second carrier 430 axially spaced to form a space, on the one hand, after the transmission medium 300 switches to the split state, it is ensured that torque cannot be transmitted between the connecting ring 211 and the second carrier 430; on the other hand, after the transmission medium 300 switches to the split state, the space formed axially between the connecting ring 211 and the second carrier 430 facilitates the insertion of tools to remove the first part, which is assembled in the first insertion hole with an interference fit, from the first insertion hole. At the same time, the support sleeve 220 is connected to the inside of the second carrier 430 through the bearing 221, so that the second carrier 430 can rotate smoothly about the axis relative to the support sleeve 220.

[0064] like Figure 1 and Figure 2 As shown, specifically, the inner circumferential surface of the second carrier 430 is provided with a first positioning platform, which abuts against the end face of the bearing 221 that is axially away from the connecting cylinder 210. The inner circumferential surface of the second carrier 430 is provided with a first limiting element 433, which abuts against the end face of the bearing 221 that is axially towards the connecting cylinder 210. The outer circumferential surface of the support sleeve 220 is provided with a second positioning platform, which abuts against the end face of the bearing 221 that is axially towards the connecting cylinder 210. The outer circumferential surface of the support sleeve 220 is provided with a second limiting element 222, which abuts against the end face of the bearing 221 that is axially away from the connecting cylinder 210.

[0065] Specifically, a dustproof element 432 is provided between the inner circumferential surface of the second carrier 430 at one end opposite to the outer bushing 100 and the outer circumferential surface of the support sleeve 220. The dustproof element 432 serves as a dustproof seal, preventing foreign objects from passing through the radial gap between the second carrier 430 and the support sleeve 220 and contacting the bearing 221.

[0066] In some embodiments, the connecting cylinder 210 is detachably connected to the support sleeve 220 via a first connecting component, so that the connecting cylinder 210 can be disassembled separately for repair or replacement when it is damaged, thereby reducing repair costs and difficulty.

[0067] The specific structure of the first connecting component will be described in detail below.

[0068] In some embodiments, the first connecting assembly includes a first through hole, a first threaded hole, and a first bolt. The first through hole is formed axially through the connecting ring 211, and the first threaded hole is disposed on the end face of the support sleeve 220 facing the connecting ring 211. The first threaded hole corresponds to the first through hole and is used for the first bolt to pass through. The first bolt matches the first threaded hole. When it is necessary to assemble the connecting sleeve 210 onto the support sleeve 220, simply pass the first bolt through the first through hole and tighten it into the corresponding first threaded hole. When it is necessary to separate the connecting sleeve 210 from the support sleeve 220, simply unscrew the first bolt from the first threaded hole. The entire assembly and disassembly operation is simple and the connection is secure.

[0069] like Figures 1 to 3 As shown, in some embodiments, the outer side wall of the second carrier 430 is provided with a process hole 431 along the radial direction, and the process hole 431 communicates with the second insertion hole. With this arrangement, after the transmission medium 300 is switched to the split state, the process hole 431 facilitates the insertion of a tool to remove the second part, which is assembled in the second insertion hole with an interference fit, from the second insertion hole and replace it with a new transmission medium 300.

[0070] like Figure 1 and Figure 2As shown, in some embodiments, the outer sidewall of the first carrier 410 away from the outer bushing 100 is configured as an outer conical surface 411, the outer conical surface 411 extends axially away from the outer bushing 100 and gradually tilts radially toward the axis of the first carrier 410; the second carrier 430 is axially slidably fitted with a mounting locking sleeve 500 on the outer peripheral surface of the end facing the inner bushing 200, the mounting locking sleeve 500 is locked by a locking assembly, the inner sidewall of the end facing the first carrier 410 is configured as an inner conical surface, the inner conical surface matches the outer conical surface 411; the permanent magnet coupling body has a closed state in which the inner conical surface and the outer conical surface 411 abut against each other, and an operating state in which the inner conical surface and the outer conical surface 411 are disengaged. A locking sleeve 500 is axially slidably fitted onto the outer circumferential surface of the second carrier 430 facing the inner sleeve 200. The inner sidewall of the locking sleeve 500 is set as an inner conical surface that matches the outer conical surface 411. When the permanent magnet coupling body is in the closed state, the locking sleeve 500 abuts against the conical surface of the first carrier 410. On the one hand, this makes the air gap A of the magnetic coupling between the outer rotor magnet 420 and the inner rotor magnet 440 relatively uniform before installation, thus solving the problem of the outer rotor magnet 420 and the inner rotor magnet 440 being eccentrically attracted together due to assembly errors, installation errors, uneven installation forces, etc. On the other hand, the friction generated by the abutment of the inner conical surface and the outer conical surface 411 prevents the first carrier 410 and the second carrier 430 from rotating relative to each other, so as to lock them for transport. When the permanent magnet coupling body is in operation, the inner conical surface and the outer conical surface 411 separate, causing the friction to disappear. At this time, the first carrier 410 can rotate axially relative to the second carrier 430. When the torque reaches the first maximum torque, the inner rotor magnet 440 and the outer rotor magnet 420 decouple and cannot transmit torque, causing the permanent magnet coupling body to switch to the overload protection state.

[0071] Specifically, the outer diameter of the locking sleeve 500 is the same as the outer diameter of the first carrier 410. With this setting, the radial alignment (coaxiality) of the permanent magnet coupling body in this embodiment can be easily adjusted by using tools such as rulers or squeegees to check the outer circle during the installation process. The operation is simple and greatly saves installation time.

[0072] The assembly process in this embodiment is as follows: First, the outer bushing 100 is removed from the first carrier 410, and then the outer bushing 100 is installed on the reducer shaft. Next, the inner bushing 200 is installed on the motor shaft. At this point, the first carrier 410, the outer rotor magnet 420, the second carrier 430, the inner rotor magnet 440, and the mounting locking sleeve 500 are magnetically coupled together to form the main body of the permanent magnet coupling. Then, the outer bushing 100 is connected to the main body of the permanent magnet coupling, and the installation alignment of the main body of the permanent magnet coupling is adjusted using a ruler or straightedge. Simultaneously, the first carrier 410 and the outer cylindrical surface of the mounting locking sleeve 500 are engaged to adjust the coaxiality of the motor shaft and the reducer shaft. Then, the mounting locking sleeve 500 is separated by a conical surface to unlock the locking assembly and move away from the outer shaft sleeve 100 by a set distance, so that the permanent magnet coupling body switches to the running state. At this time, the mounting locking sleeve 500 and the first carrier 410 form a conical surface gap. Then, the locking assembly is locked. Thus, the outer rotor and inner rotor of the coupling have completely achieved non-contact transmission, and the installation is completed.

[0073] Specifically, the locking assembly includes a third through hole, a third threaded hole, a fourth threaded hole, and a fastening bolt 510. The third threaded hole and the fourth threaded hole are located on the outer peripheral surface of the second carrier 430 and are spaced apart axially. The third threaded hole and the fourth threaded hole are matched with the fastening bolt 510. The third through hole is formed radially through the mounting locking sleeve 500. When the mounting locking sleeve 500 moves away from the outer bushing 100 at a set distance to the position where the corresponding permanent magnet coupling body is in motion, the third through hole and the third threaded hole are aligned radially. At this time, the fastening bolt 510 is passed through the third through hole and tightened into the third threaded hole to lock the mounting locking sleeve 500. When the mounting locking sleeve 500 moves towards the outer bushing 100 at a set distance to the position where the corresponding permanent magnet coupling body is in a closed state, the third through hole and the fourth threaded hole are aligned radially. At this time, the fastening bolt 510 is passed through the third through hole and tightened into the fourth threaded hole to lock the mounting locking sleeve 500.

[0074] More specifically, the number of third threaded holes and fourth threaded holes is the same, and there are multiple third threaded holes, preferably eight, which are evenly distributed circumferentially.

[0075] To reduce the structural size of this embodiment, specifically, the radial projection of the mounting locking sleeve 500 covers the process hole 431. When it is necessary to remove the second part from the second insertion hole, first unlock the locking assembly, then remove the mounting locking sleeve 500 from the second carrier 430 to expose the process hole 431, and then insert a tool to remove the second part, which is assembled in the second insertion hole in an interference fit manner, from the second insertion hole and replace it with a new transmission medium 300.

[0076] More specifically, when the permanent magnet coupling body is in operation, the space between the locking sleeve 500 and the first carrier 410 along the axial direction forms a mechanical labyrinth structure to achieve dust prevention.

[0077] In some embodiments, the first carrier 410 is detachably connected to the outer bushing 100 for assembling this embodiment.

[0078] Specifically, the first carrier 410 includes a mounting disk 412 and a mounting cylinder 413 arranged coaxially. The outer rotor magnet 420 is disposed on the inner circumferential surface of the mounting cylinder 413. The mounting disk 412 is detachably connected to the outer bushing 100 through a second connecting assembly.

[0079] Specifically, the outer circumferential surface of the outer bushing 100 is provided with a mounting ring 110 protruding radially. The second connecting assembly includes a matching second through hole, a second threaded hole and a second bolt. The second through hole is formed axially through the mounting plate 412. The second threaded hole is provided on the end face of the mounting cylinder 413 facing the mounting plate 412. The second threaded hole is provided corresponding to the second through hole. The second through hole is used for the second bolt to pass through. The second bolt matches the second threaded hole.

[0080] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A self-protected synchronous permanent magnet coupling, characterized in that, include: Outer bushing (100) is used to connect either the drive shaft or the load shaft; An inner bushing (200) is used to connect the other of the drive shaft and the load shaft. The inner bushing (200) is spaced apart at one end of the outer bushing (100) along the axial direction. A first insertion hole is formed through the inner bushing (200) along the axial direction. The permanent magnet coupling body is coaxially disposed at one end of the outer bushing (100) facing the inner bushing (200) along the axial direction. The permanent magnet coupling body is rotatably disposed on the inner bushing (200) around the axial direction. The permanent magnet coupling body is provided with a second insertion hole corresponding to the position of the first insertion hole. The transmission medium (300) is detachably connected to the first insertion hole and the second insertion hole via a connecting structure; the transmission medium (300) is one of an elastic pin structure, a diaphragm structure, or a bolt structure; The permanent magnet coupling body has an overload protection state that decouples when the torque reaches the first maximum torque. The transmission medium (300) has a split state that breaks into a first part and a second part when the torque reaches the second maximum torque. The first part is disposed in the first insertion hole, and the second part is disposed in the second insertion hole. The first maximum torque is greater than the second maximum torque. When the transmission medium (300) is in the split state, the torque transmission between the inner bushing (200) and the permanent magnet coupling body is cut off.

2. The self-protected synchronous permanent magnet coupling according to claim 1, characterized in that, The transmission medium (300) is provided in multiple ways, and the multiple transmission media (300) are evenly distributed at intervals along the circumference.

3. The self-protected synchronous permanent magnet coupling according to claim 1, characterized in that, One end of the transmission medium (300) is provided with a limiting part (310), which is used to abut against the end face of the inner bushing (200) that is axially away from the outer bushing (100).

4. The self-protected synchronous permanent magnet coupling according to claim 1, characterized in that, The transmission medium (300) is interference-fitted with the first insertion hole, and the transmission medium (300) is interference-fitted with the second insertion hole.

5. A self-protected synchronous permanent magnet coupling according to any one of claims 1 to 4, characterized in that, The permanent magnet coupling body includes: The first carrier (410) is coaxially disposed at one end of the outer bushing (100) facing the inner bushing (200); An outer rotor magnet (420) is disposed on the inner circumferential surface of the first carrier (410); The second carrier (430) is rotatably connected to the outer peripheral surface of the portion of the inner bushing (200) extending into the first carrier (410), and the second insertion hole is provided on the end face of the second carrier (430) facing the inner bushing (200); An inner rotor magnet (440) is disposed on the outer peripheral surface of the second carrier (430). The inner rotor magnet (440) is disposed correspondingly to the outer rotor magnet (420). An air gap is disposed between the inner rotor magnet (440) and the outer rotor magnet (420) in the radial direction.

6. A self-protected synchronous permanent magnet coupling according to claim 5, characterized in that, The inner bushing (200) includes a connecting sleeve (210) and a support sleeve (220). The connecting sleeve (210) is used to connect the drive shaft. A connecting ring (211) is radially protruding on the outer circumferential surface of the connecting sleeve (210). The first insertion hole is provided in the connecting ring (211). The connecting ring (211) and the second carrier (430) are axially spaced apart. The support sleeve (220) is coaxially connected to one end of the connecting sleeve (210) facing the outer bushing (100). The end of the support sleeve (220) away from the connecting sleeve (210) is connected to the inside of the second carrier (430) through a bearing (221).

7. A self-protected synchronous permanent magnet coupling according to claim 6, characterized in that, The connecting cylinder (210) is detachably connected to the support sleeve (220) via the first connecting component.

8. A self-protected synchronous permanent magnet coupling according to claim 5, characterized in that, The outer side wall of the second carrier (430) is provided with a process hole (431) in the radial direction, and the process hole (431) is connected to the second insertion hole.

9. A self-protected synchronous permanent magnet coupling according to claim 5, characterized in that, The outer side wall of the first carrier (410) away from the outer bushing (100) is configured as an outer conical surface (411). The outer conical surface (411) extends axially away from the outer bushing (100) and gradually approaches the axis of the first carrier (410) radially. The outer peripheral surface of the second carrier (430) is axially slidably fitted with a mounting locking sleeve (500). The mounting locking sleeve (500) is locked by a locking assembly. The inner side wall of the mounting locking sleeve (500) facing the first carrier (410) axially is configured as an inner conical surface. The inner conical surface matches the outer conical surface (411). The permanent magnet coupling body has a closed state in which the inner conical surface and the outer conical surface (411) abut against each other, and an operating state in which the inner conical surface and the outer conical surface (411) are disengaged.

10. A self-protected synchronous permanent magnet coupling according to claim 6, characterized in that, A dustproof element (432) is provided between the inner circumferential surface of the second carrier (430) away from the outer bushing (100) along the axial direction and the outer circumferential surface of the support sleeve (220).

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