A disc-type self-adjusting air gap permanent magnetic soft connection device

Abstract

The present invention relates to the field of mechanical transmission technology, and specifically to a disc-type self-adjusting air gap permanent magnetic soft connection device. It includes: a first connecting shaft, on which an induction disk is fixed; a second connecting shaft, on which a permanent magnetic disk can be axially slidably installed; a limiter, located on the second connecting shaft and located between the permanent magnetic disk and the induction disk; a tensile elastic member, located on the second connecting shaft and the free end of which is connected to the permanent magnetic disk; a centrifugal drive assembly, located on the side of the permanent magnetic disk away from the induction disk, including a guide rod, a centrifugal block, an elastic member and a linkage block, the guide rod is fixed on the second connecting shaft, the centrifugal block can be slidably mounted on the guide rod, the linkage block is fixed on the permanent magnetic disk, the linkage block and the centrifugal block are connected through an inclined surface or a conical surface, and the inclined surface or the conical surface is suitable for driving the linkage block to move in a direction away from the guide rod when the centrifugal block moves radially outward. By adopting the above scheme, automatic adjustment of the air gap can be achieved during startup, and the structure is simple, the weight is light, and the cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical transmission, and in particular to a disc-type self-adjusting air gap permanent magnetic soft connection device. Background Art

[0002] In order to solve the problem of excessive starting torque, a hydraulic coupler or soft starter is generally added between the motor and the load. The hydraulic coupler can delay the motor starting time and reduce the starting impact, but it has problems such as low efficiency, oil leakage and large space occupation; conventional soft starters can achieve soft start of the system, but they all require a special control system, have a complex structure and are inconvenient to maintain.

[0003] For this reason, a permanent magnet coupler specifically designed to solve the above problems has been developed on the market. The existing permanent magnet couplers mainly include disc permanent magnet couplers and cylinder permanent magnet couplers. The induction rotor and the permanent magnet rotor of the disc permanent magnet coupler have a certain air gap in the axial direction; the induction rotor and the permanent magnet rotor of the cylinder permanent magnet coupler have a certain air gap in the radial direction. Both types of permanent magnet couplers rely on the conductor in the induction rotor to cut the magnetic lines of force generated by the magnetic steel in the permanent magnet rotor to generate an induced magnetic field, and the two sets of magnetic fields interact to transmit torque.

[0004] In order to improve the efficiency of existing permanent magnet couplers, the slip rate is generally not more than 4%, that is, the slip rate does not exceed 60rpm under rated torque, because if the slip rate is higher, the induction disk will heat up seriously and the efficiency will be reduced. However, a lower slip rate will cause the permanent magnet coupler to reach the rated torque at the moment of motor startup, and the system startup impact will be larger. The motor may not be able to drive the load and cause "stifling", or it may exceed the maximum torque instantly, surpassing the optimal operating slip speed of the coupler, and always running at a high slip rate, with low operating efficiency and serious heating; in addition, for loads with large starting inertia, the motor may be overloaded and unable to start. In order to solve the above problems, some permanent magnet couplers have added external actuators to adjust the air gap to achieve slip adjustment, but their structure is complex, the weight becomes heavier, and the additional rotational inertia increases. It is difficult to eliminate the additional vibration factors for high-speed or high-power equipment. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the permanent magnetic coupler with adjustable air gap in the prior art, such as complex structure and heavy weight, so as to provide a disc-type permanent magnetic soft connection device capable of self-adjusting the air gap.

[0006] In order to solve the above technical problems, the present invention provides a disc-type self-adjusting air gap permanent magnetic soft connection device, comprising:

[0007] A first connecting shaft, on which an induction disk is fixed;

[0008] a second connecting shaft, coaxial with the first connecting shaft, on which a permanent magnetic disk is axially slidably mounted;

[0009] A limiting member, adapted to limit the axial movement of the permanent magnetic disk, the limiting member being fixed or integrally formed on the second connecting shaft and being located between the permanent magnetic disk and the induction disk;

[0010] A stretching elastic member, adapted to pull the permanent magnetic disk to a limit position farthest from the induction disk, which is relatively fixed on the second connecting shaft and has a free end connected to the permanent magnetic disk;

[0011] A centrifugal drive assembly is located on a side of the permanent magnetic disk away from the induction disk, and comprises a guide rod, a centrifugal block, an elastic member and a linkage block. The guide rod is fixed on the second connecting shaft and arranged radially along the second connecting shaft. The centrifugal block can be slidably mounted on the guide rod. The elastic member is suitable for preventing the centrifugal block from moving outward along the guide rod. The linkage block is fixed on the permanent magnetic disk. The linkage block is connected to the centrifugal block through an inclined surface or a conical surface, and the inclined surface or the conical surface is suitable for driving the linkage block to move in a direction away from the guide rod when the centrifugal block moves radially outward.

[0012] Optionally, two induction disks are provided, the two induction disks are parallel and fixedly connected by a connecting piece; two permanent magnetic disks are provided corresponding to the induction disk and are located between the two induction disks, a linkage block is fixed on each permanent magnetic disk, the centrifugal block is connected to the two linkage blocks at the same time through an inclined surface or a conical surface, the two ends of the tensile elastic member are respectively connected to the two permanent magnetic disks, and two limit members are provided corresponding to the permanent magnetic disk.

[0013] Optionally, the centrifugal drive components and the tensile elastic members are uniformly distributed in a plurality of groups along the circumference of the second connecting shaft, and the centrifugal drive components and the tensile elastic members are arranged alternately in a cycle.

[0014] Optionally, the second connecting shaft is a hollow shaft, the limiting member close to the first connecting shaft is a blocking cover fixed to the end of the second connecting shaft, and the limiting member away from the first connecting shaft is a shoulder integrally formed on the second connecting shaft.

[0015] Optionally, the stretch elastic member and / or the elastic member can be detachably mounted or can be adjusted in length.

[0016] Optionally, the elastic member is a compression elastic member, a nut is screwed onto the outer end of the guide rod, one end of the elastic member abuts against the centrifugal block, and the other end abuts against the nut.

[0017] Optionally, a heat dissipation tooth is provided on an end surface of the induction disk away from the permanent magnet disk.

[0018] Optionally, the heat dissipation teeth are a plurality of coaxially arranged annular teeth.

[0019] Optionally, the permanent magnetic disk includes:

[0020] A permanent magnetic carrier disk, the end surface of which is away from the induction disk and is provided with a mounting groove;

[0021] A permanent magnet is embedded in the installation groove;

[0022] A pressing plate is fixed on the permanent magnet carrier disk and is suitable for pressing the permanent magnet.

[0023] Optionally, the installation grooves are provided in plurality and are evenly distributed along the circumference of the permanent magnet carrier disk, a permanent magnet is embedded in each installation groove and the magnetic poles of adjacent permanent magnets are opposite.

[0024] The technical solution of the present invention has the following advantages:

[0025] 1. The disc-type self-adjusting air gap permanent magnetic soft connection device provided by the present invention utilizes the centrifugal force during rotation to gradually move the centrifugal block radially outward, and the centrifugal block drives the permanent magnetic disk through the linkage block and overcomes the tensile force of the tensile elastic member to gradually approach the induction disk, thereby slowly reducing the air gap, increasing the density of the induction rotor cutting the magnetic lines of force, and slowly increasing the load torque. The maximum torque in the motor starting torque curve is utilized to drive the load to start, so that the no-load start of the motor is realized, the starting current is small, the impact on the load is small, and after the start is completed, the slip during rated operation is small, the efficiency is high, the slip heating of the body can be reduced, and the safety and reliability of use are improved;

[0026] 2. The disc-type self-adjusting air gap permanent magnetic soft connection device provided by the present invention can realize automatic adjustment of the air gap during the startup process through the cooperation of stretching elastic parts, limit parts and centrifugal drive components. Compared with the permanent magnetic coupler of the existing external actuator, it has low production cost, simple structure, light weight, can reduce the load on the shaft, helps to make the product suitable for higher speed and greater power scenarios, and helps to reduce vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A structural cross-sectional view of a permanent magnetic flexible connection device according to an embodiment of the present invention;

[0029] Figure 2 A three-dimensional diagram of a permanent magnetic flexible connection device according to an embodiment of the present invention;

[0030] Figure 3 is a layout diagram of permanent magnets according to an embodiment of the present invention;

[0031] Figure 4 A schematic diagram of the structure of a heat dissipation tooth according to an embodiment of the present invention;

[0032] Figure 5 This is a state diagram of the permanent magnetic soft connection device of an embodiment of the present invention when it is started without load;

[0033] Figure 6 This is a state diagram of the permanent magnetic flexible connection device during rated operation according to an embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 1. First connecting shaft; 2. Induction disk; 21. Carrier disk; 211. Heat dissipation teeth; 22. Conductor ring; 23. Connector; 3. Second connecting shaft; 4. Permanent magnetic disk; 41. Permanent magnetic carrier disk; 42. Permanent magnet; 43. Press plate; 5. Limiting member; 51. Block cover; 52. Shoulder; 6. Tensile elastic member; 7. Centrifugal drive assembly; 71. Guide rod; 72. Centrifugal block; 73. Elastic member; 74. Linkage block; 75. Nut. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] Reference Figure 1 and Figure 2 The disc-type self-adjusting air gap permanent magnetic soft connection device provided in this embodiment includes:

[0041] A first connecting shaft 1, on which an induction disc 2 is fixed, the induction disc 2 comprises a carrier disc 21 and a conductor ring 22, the carrier disc 21 is fixed on the first connecting shaft 1, and the conductor ring 22 is fixed on the carrier disc 21;

[0042] The second connecting shaft 3 is coaxial with the first connecting shaft 1, and a permanent magnetic disk 4 is axially slidably mounted on the second connecting shaft 3. The permanent magnetic disk 4 is slidably mounted on the second connecting shaft 3 using a spline, a flat key, or other commonly used structures in the art;

[0043] A limiting member 5, adapted to limit the axial movement of the permanent magnetic disk 4, the limiting member 5 being fixed or integrally formed on the second connecting shaft 3 and being located between the permanent magnetic disk 4 and the induction disk 2;

[0044] The stretching elastic member 6 is suitable for pulling the permanent magnetic disk 4 to the extreme position farthest from the induction disk 2. The stretching elastic member 6 is relatively fixed on the second connecting shaft 3 and the free end is connected to the permanent magnetic disk 4. The stretching elastic member 6 can be a common structure such as a tension spring and an elastic rope. The stretching elastic member 6 can be directly or indirectly fixed to the second connecting shaft 3 through other connecting members. The fixing means that the overall position relative to the second connecting shaft 3 does not change, but the part can be elastically deformed. In the specific implementation, the stretching elastic member 6 can be partially fixed on the second connecting shaft 3;

[0045] The centrifugal drive assembly 7 is located on the side of the permanent magnetic disk 4 away from the induction disk 2, and includes a guide rod 71, a centrifugal block 72, an elastic member 73 and a linkage block 74. The guide rod 71 is fixed on the second connecting shaft 3 and arranged radially along the second connecting shaft 3. The centrifugal block 72 can be slidably mounted on the guide rod 71. The elastic member 73 is suitable for preventing the centrifugal block 72 from moving outward along the guide rod 71. The linkage block 74 is fixed on the permanent magnetic disk 4. The linkage block 74 is connected to the centrifugal block 72 through an inclined surface or a conical surface, and the inclined surface or the conical surface is suitable for driving the linkage block 74 to move in a direction away from the guide rod 71 when the centrifugal block 72 moves radially outward.

[0046] In the above scheme, the elastic member 73 can be a tensile elastic member or a compressive elastic member, such as a tension spring, a compression spring or an elastic tube. Preferably, the elastic member 73 is a compressive elastic member, and a nut 75 is screwed on the outer end of the guide rod 71. One end of the elastic member 73 abuts against the centrifugal block 72, and the other end abuts against the nut 75, which is more convenient to install. In other embodiments, a tensile elastic member can also be used, but in order to prevent the centrifugal block 72 from moving outward along the guide rod 71, the elastic member 73 needs to be set on the side of the centrifugal block 72 close to the second connecting shaft 3, and the tension of the elastic member forces the centrifugal block 72 to move toward the second connecting shaft 3. No matter what kind of elastic member 73 structure is used, as long as it can ensure that the function of the elastic member 73 is to drive the centrifugal member 72 close to the second connecting shaft 3.

[0047] The permanent magnetic soft connection device of the present application is that when starting, the permanent magnetic disk 4 is farthest from the induction disk 2 (such as Figure 5 , which is equivalent to no-load start; after the start is completed, as the speed of the second connecting shaft 3 increases, the centrifugal force on the centrifugal block 72 gradually increases. When the centrifugal force is greater than the combined force of the elastic member 73 and the tensile elastic member 6 in the direction of the centrifugal force, the centrifugal block 72 will move outward along the guide rod 71, and the centrifugal block 72 drives the linkage block 74 to move axially along the second connecting shaft 3 through the inclined surface or conical surface, so that the permanent magnetic disk 4 gradually approaches the induction disk 2. At this time, the air gap between the induction disk 2 and the permanent magnetic disk 4 becomes smaller, the magnetic induction increases, and the load torque increases slowly, driving the induction disk 2 to rotate until the permanent magnetic disk 4 stops moving when it abuts against the limit member 5. At this time, the optimal operating gap is reached (as shown in FIG. Figure 6 In this state, the air gap is the smallest, the slip difference under rated torque is the smallest, the heat generation is the smallest, and the efficiency is the highest. The core invention of this application is that the structural basis for adjusting the above air gap is not an external actuator, but an automatic adjustment is achieved through the cooperation of the centrifugal drive assembly 7, the limiter 5 and the stretch elastic member 6. It has low cost, simple structure, low weight, reduces the load on the shaft, and helps to make the product suitable for higher speed and higher power scenarios.

[0048] Reference Figure 1 , this embodiment provides a preferred structure: the induction disk 2 is provided with two, the two induction disks 2 are parallel and fixedly connected by a connecting member 23, and the connecting member 23 in this embodiment is a plurality of connecting rods uniformly distributed along the circumference of the induction disk 2, so as to form a "cage-type" structure; the permanent magnetic disk 4 is provided with two corresponding induction disks 2 and is located between the two induction disks 2, and each permanent magnetic disk 4 is fixed with a linkage block 74, and the centrifugal block 72 is connected to the two linkage blocks 74 at the same time through an inclined surface or a conical surface, and the two ends of the tensile elastic member 6 are respectively connected to the two permanent magnetic disks 4, and the limiting member 5 is provided with two corresponding permanent magnetic disks 4. It should be noted that here, both ends of the tensile elastic member 6 are connected to the permanent magnetic disk 4, so that the tensile elastic member 6 can be fixed relative to the second connecting shaft 3, and no other structure is required to fix the tensile elastic member 6. However, for the structure of the single permanent magnetic disk 4, the tensile elastic member 6 needs to be partially connected to the second connecting shaft 3 to achieve its fixation relative to the second connecting shaft 3.

[0049] By adopting the above structure, on the one hand, the two sets of induction rotors and the two sets of permanent magnet rotors work together to provide a greater torque for the load, thereby improving the starting ability of the coupler; on the other hand, the two sets of structures are symmetrically arranged, so that the centrifugal block 72 is subjected to uniform force during movement, reducing the friction between the centrifugal block 72 and the guide rod 71, making the movement of the entire structure smoother and more reliable.

[0050] Reference Figure 1 As a further improvement of the above technical solution, the second connecting shaft 3 is a hollow shaft, the limiting member 5 close to the first connecting shaft 1 is a stopper 51 fixed to the end of the second connecting shaft 3, and the limiting member 5 away from the first connecting shaft 1 is a shaft shoulder 52 integrally formed on the second connecting shaft 3. By adopting this structure, during assembly, the two permanent magnetic disks 4 can be firstly installed on the second connecting shaft 3, and then the stopper 51 can be installed, which is more convenient for installation. Of course, in other embodiments, the limiting member 5 can also adopt other common structures, such as interferingly installing a shaft ring as the limiting member 5 at the positions of the second connecting shaft 3 corresponding to the two permanent magnetic disks 4, or evenly fixing multiple limiting pins on the second connecting shaft 3 along the circumferential direction as the limiting member 5.

[0051] Reference Figure 2 This embodiment also provides a preferred structure: the centrifugal drive assembly 7 and the tensile elastic member 6 are evenly distributed in multiple groups along the circumference of the second connecting shaft 3, and the centrifugal drive assembly 7 and the tensile elastic member 6 are arranged alternately in a cycle. By adopting this structure, the permanent magnetic disk 4 is evenly stressed in the circumferential direction, so that the permanent magnetic disk 4 slides more smoothly on the second connecting shaft 3.

[0052] Reference Figure 1 and Figure 2This embodiment provides a preferred installation method, wherein the stretch elastic member 6 and / or the elastic member 73 can be detachably installed or the length can be adjusted. Specifically, a commonly used installation structure in the art can be used, for example, Figure 1 The installation structure of the stretch elastic member 6 is as follows: a lock buckle is fixed on the permanent magnetic disk 4, and then the end of the stretch elastic member 6 is hooked on the lock buckle to achieve detachable installation; or Figure 1 The installation structure of the middle elastic member 73: a nut 75 is screwed on the outer end of the guide rod 71, one end of the elastic member 73 abuts against the centrifugal block 72, and the other end abuts against the nut 75; or the lock buckle in the first solution is set to an adjustable length structure. By adopting this structure, the elastic force of the stretching elastic member 6 and / or the elastic member 73 can be adjusted according to different motors, so as to adapt to motors of different levels.

[0053] Reference Figure 1 As a further improvement of the above technical solution, a first-level stepped hole is provided in the centrifugal block 72, the small-diameter hole of the first-level stepped hole is gap-fitted on the guide rod 71, the large-diameter hole of the first-level stepped hole is located outside the small-diameter hole, and one end of the elastic member 73 abuts against the stepped surface of the first-level stepped hole. By adopting this structure, the large-diameter hole of the first-level stepped hole can have a limiting effect on the elastic member 73, and the elastic member 73 directly abuts against the part of the centrifugal block 72 close to the second connecting shaft 3, and the driving is more stable.

[0054] Reference Figure 4 This embodiment also provides a preferred structure of the induction disk 2: the end surface of the induction disk 2 away from the permanent magnet disk 4 is provided with heat dissipation teeth 211. Because the permanent magnet disk 4 and the induction disk 2 need to have a certain slip speed during the transmission process, slip loss and heat dissipation will be generated during the operation. By adopting this structure, the heat dissipation teeth 211 can improve the heat dissipation efficiency of the induction disk 2. Preferably, the heat dissipation teeth 211 are multiple coaxially arranged annular teeth, which can further improve the heat dissipation efficiency.

[0055] Reference Figure 1 This embodiment also provides a preferred permanent magnetic disk 4 structure, including:

[0056] A permanent magnetic carrier disk 41, whose end surface away from the induction disk 2 is provided with a mounting groove;

[0057] The permanent magnet 42 is embedded in the mounting groove;

[0058] The pressure plate 43 is fixed on the permanent magnet carrier disk 41 and is suitable for pressing the permanent magnet 42 .

[0059] Specifically, the pressure plate 43 is an annular plate, which is fixed on the permanent magnetic carrier disk 41 by bolts.

[0060] By adopting the above structure, during assembly, the permanent magnet 42 is first embedded in the installation groove, and then the pressing plate 43 is fixed on the permanent magnet carrier disk 41 to complete the pressing of the permanent magnet 42, which is convenient for installation and reliable for fixing.

[0061] Reference Figure 3 Preferably, the mounting grooves are provided in plurality and are evenly distributed along the circumference of the permanent magnetic carrier disk 41 , and a permanent magnet 42 is embedded in each mounting groove and the magnetic poles of adjacent permanent magnets 42 are opposite.

[0062] Specifically, the shape of the installation groove can be fan-shaped, circular, rectangular, etc., and a fan-shaped shape is preferred.

[0063] In this embodiment, the conductor ring is made of a material with high conductivity, such as aluminum (alloy), copper (alloy), etc.; the carrier disk is made of a non-magnetic material with good heat dissipation, such as aluminum (alloy); the permanent magnet 42 is made of rare earth permanent magnet material; the pressure plate 43 is made of a non-magnetic material, such as stainless steel or aluminum (alloy), etc.; the permanent magnet carrier disk 41 is made of a non-magnetic material, such as stainless steel or aluminum (alloy), etc.; the linkage block 74 and the centrifugal block 72 can be made of either magnetic material or non-magnetic material.

[0064] As a specific implementation form, the working process of the permanent magnetic soft connection device of the present invention is as follows:

[0065] First, the second connecting shaft 3 is connected to the driving end, and the first connecting shaft 1 is connected to the load end.

[0066] Reference Figure 5 During startup, the two permanent magnetic disks 4 approach each other under the tension of the stretching elastic member 6 until a balance is reached. At this time, the air gap between the permanent magnetic disk 4 and the induction disk 2 is the largest, which is LO. Starting in this state is equivalent to no-load starting.

[0067] After starting, as the rotation speed of the second connecting shaft 3 increases, the centrifugal force on the centrifugal block 72 increases. When the centrifugal force on the centrifugal block 72 is greater than the combined force of the elastic member 73 and the tensile elastic member 6 in the direction of the centrifugal force, the centrifugal block 72 will move outward along the guide rod 71. Since the centrifugal block 72 is in contact with the linkage block 74 through the inclined surface or the conical surface, the linkage block 74 will follow the centrifugal block 72 and move synchronously along the axial direction of the second connecting shaft 3 away from the guide rod 71, thereby reducing the air gap between the permanent magnetic disk 4 and the induction disk 2, increasing the torque, and then driving the load to rotate.

[0068] The two permanent magnetic disks 4 move away from each other under the action of the centrifugal block 72 until the permanent magnetic disks 4 stop moving when they abut the corresponding limiter 5. At this time, the air gap between the permanent magnetic disks 4 and the induction disk 2 is the smallest, which is L1. At this time, the efficiency is the highest and the heat generation is the lowest. Figure 6 As shown, this state is the rated operating state.

[0069] When the machine is stopped, the speed of the second connecting shaft 3 decreases, and the centrifugal force on the centrifugal block 72 is insufficient to overcome the combined force of the elastic member 73 and the tensile elastic member 6 in the direction of the centrifugal force, so the centrifugal block 72 slides inward along the guide rod 71 until it reaches the limit position. At this time, the two permanent magnetic disks 4 are also reset to the limit position under the action of the tensile elastic member 6. Figure 5 Status shown.

[0070] The above descriptions are all based on the permanent magnetic soft connection device as a soft starter, but in actual use, the permanent magnetic soft connector can also be used as a torque limiter. The specific principles are as follows:

[0071] First, the first connecting shaft 1 is connected to the driving end, and the second connecting shaft 3 is connected to the load end.

[0072] When the load end is suddenly overloaded and stalled, the centrifugal block 72 loses its centrifugal force, and the two permanent magnetic disks 4 approach each other under the action of the tensile elastic member 6, and the air gap between the induction disk 2 and the permanent magnetic disk 4 increases until the permanent magnetic disk 4 moves to the limit position farthest from the induction disk 2. At this time, the eddy current coupling becomes weak coupling due to the increase in the coupling distance, thereby cutting off the torque transmission between the motor and the load. Thereafter, the motor is unloaded, and the load shaft system has no torque or moment transmission, thereby achieving a torque limiting effect and protecting the entire shaft system.

[0073] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A disc-type self-adjusting air gap permanent magnetic soft connection device, characterized in that: include: A first connecting shaft (1) on which an induction disc (2) is fixed; A second connecting shaft (3) is coaxial with the first connecting shaft (1), and a permanent magnetic disk (4) is axially slidably mounted on the second connecting shaft (3); a limiting member (5) adapted to limit the axial movement of the permanent magnetic disk (4), the limiting member (5) being fixed or integrally formed on the second connecting shaft (3) and being located between the permanent magnetic disk (4) and the induction disk (2); A tensile elastic member (6), adapted to pull the permanent magnetic disk (4) to a limit position farthest from the induction disk (2), which is relatively fixed on the second connecting shaft (3) and has a free end connected to the permanent magnetic disk (4); A centrifugal drive assembly (7) is located on a side of the permanent magnetic disk (4) away from the induction disk (2), and comprises a guide rod (71), a centrifugal block (72), an elastic member (73) and a linkage block (74); the guide rod (71) is fixed on the second connecting shaft (3) and arranged radially along the second connecting shaft (3); the centrifugal block (72) can be slidably mounted on the guide rod (71); the elastic member (73) is suitable for preventing the centrifugal block (72) from moving outward along the guide rod (71); the linkage block (74) is fixed on the permanent magnetic disk (4); the linkage block (74) is connected to the centrifugal block (72) through an inclined surface or a conical surface; and the inclined surface or the conical surface is suitable for driving the linkage block (74) to move in a direction away from the guide rod (71) when the centrifugal block (72) moves radially outward.

2. The disc-type self-adjusting air gap permanent magnetic soft connection device according to claim 1 is characterized in that: Two induction discs (2) are provided, the two induction discs (2) are parallel and fixedly connected via a connecting piece (23); two permanent magnetic discs (4) are provided corresponding to the induction discs (2) and are located between the two induction discs (2); a linkage block (74) is fixed on each permanent magnetic disc (4); the centrifugal block (72) is connected to the two linkage blocks (74) at the same time via an inclined surface or a conical surface; the two ends of the tensile elastic member (6) are respectively connected to the two permanent magnetic discs (4); and two limit members (5) are provided corresponding to the permanent magnetic discs (4).

3. The disc-type self-adjusting air gap permanent magnetic soft connection device according to claim 1 or 2, characterized in that: The centrifugal drive components (7) and the tensile elastic components (6) are both evenly distributed in multiple groups along the circumference of the second connecting shaft (3), and the centrifugal drive components (7) and the tensile elastic components (6) are arranged alternately in a cycle.

4. The disc-type self-adjusting air gap permanent magnetic soft connection device according to claim 2 is characterized in that: The second connecting shaft (3) is a hollow shaft, the limiting member (5) close to the first connecting shaft (1) is a stop cover (51) fixed to the end of the second connecting shaft (3), and the limiting member (5) away from the first connecting shaft (1) is a shaft shoulder (52) integrally formed on the second connecting shaft (3).

5. The disc-type self-adjusting air gap permanent magnetic soft connection device according to claim 1 is characterized in that: The stretch elastic member (6) and / or the elastic member (73) can be detachably installed or the length can be adjusted.

6. The disc-type self-adjusting air gap permanent magnetic soft connection device according to claim 5 is characterized in that: The elastic member (73) is a compression elastic member. A nut (75) is screwed onto the outer end of the guide rod (71). One end of the elastic member (73) abuts against the centrifugal block (72), and the other end abuts against the nut (75).

7. The disc-type self-adjusting air gap permanent magnetic soft connection device according to claim 1 is characterized in that: The end surface of the induction disk (2) away from the permanent magnet disk (4) is provided with heat dissipation teeth (211).

8. The disc-type self-adjusting air gap permanent magnetic soft connection device according to claim 7 is characterized in that: The heat dissipation teeth (211) are a plurality of coaxially arranged annular teeth.

9. The disc-type self-adjusting air gap permanent magnetic soft connection device according to claim 1, characterized in that: The permanent magnetic disk (4) comprises: A permanent magnetic carrier disk (41) having an installation groove formed on its end surface away from the induction disk (2); A permanent magnet (42) is embedded in the installation groove; A pressure plate (43) is fixed on the permanent magnet carrier disk (41) and is suitable for pressing the permanent magnet (42).

10. The disc-type self-adjusting air gap permanent magnetic soft connection device according to claim 9, characterized in that: The installation grooves are provided in plurality and are evenly distributed along the circumference of the permanent magnetic carrier disk (41); a permanent magnet (42) is embedded in each installation groove, and the magnetic poles of adjacent permanent magnets (42) are opposite.

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