CN215817884U - Disc type self-adjusting air gap permanent magnet flexible connection device - Google Patents

Abstract

The utility model relates to the technical field of mechanical transmission, in particular to a disc type self-adjusting air gap permanent magnet flexible connection device. The method comprises the following steps: the first connecting shaft is fixedly provided with an induction disc; the permanent magnetic disc is axially and slidably arranged on the second connecting shaft; the limiting piece is positioned on the second connecting shaft and positioned between the permanent magnetic disc and the induction disc; the stretching elastic piece is positioned on the second connecting shaft, and the free end of the stretching elastic piece is connected with the permanent magnetic disc; the centrifugal driving assembly is positioned on one side, far away from the induction disc, of the permanent magnet disc and comprises a guide rod, a centrifugal block, an elastic piece and a linkage block, the guide rod is fixed on the second connecting shaft, the centrifugal block is slidably sleeved on the guide rod, the linkage block is fixed on the permanent magnet disc, the linkage block is connected with 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 towards the direction far away from the guide rod when the centrifugal block moves outwards in the radial direction. By adopting the scheme, the automatic adjustment of the air gap can be realized during starting, the structure is simple, the weight is light, and the cost is low.

Description

Disc type self-adjusting air gap permanent magnet flexible connection device

Technical Field

The utility model relates to the technical field of mechanical transmission, in particular to a disc type self-adjusting air gap permanent magnet flexible connection device.

Background

In order to solve the problem of excessive starting torque, a fluid coupling or a soft starter is generally added between the motor and the load. The hydraulic coupler can delay the starting time of a motor and slow down the starting impact, but has the problems of low efficiency, oil leakage and large occupied space; the conventional soft starter can realize the soft start of the system, but all the conventional soft starters need a special control system, and have complex structures and inconvenient maintenance.

For this reason, permanent magnet couplers have been developed on the market specifically to solve the above-mentioned problems. The existing permanent magnet coupler mainly comprises a disc type permanent magnet coupler and a cylinder type permanent magnet coupler. A certain air gap is reserved between an induction rotor and a permanent magnet rotor of the disc type permanent magnet coupler in the axial direction; a certain air gap is reserved between the induction rotor and the permanent magnet rotor of the cylindrical permanent magnet coupler in the radial direction. The two types of permanent magnet couplers generate induced magnetic fields by means of magnetic induction lines generated by cutting magnetic steel in the permanent magnet rotor by conductors in the induction rotor, and the two groups of magnetic fields interact to transfer torque.

In order to improve the efficiency of the existing permanent magnet coupler, the slip ratio is generally not more than 4 percent, namely the slip under rated torque is not more than 60rpm, because if the slip ratio is higher, the induction disc heats seriously, and the efficiency is reduced. However, the lower slip ratio can cause the permanent magnet coupler to reach the rated torque at the moment of starting the motor, the system starting impact is larger, the motor can not drive the load to generate a 'stuffiness', or the motor exceeds the maximum torque instantly, and the motor runs at a high slip ratio all the time after passing through the optimal running slip rotation speed of the coupler, so the running efficiency is low, and the heating is serious; in addition, loads with large starting inertia may cause the motor to overload and fail to start. In order to solve the problems, an external actuating mechanism is additionally arranged on part of the permanent magnet coupler to adjust an air gap so as to realize adjustment of slip, but the structure is complex, the weight is heavy, the additional rotational inertia is increased, and the additional vibration factor of high-speed or high-power equipment is difficult to eliminate.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the utility model is to overcome the defects of complex structure and heavy weight of the permanent magnet coupler with adjustable air gap in the prior art, so as to provide a disc type permanent magnet flexible connection device capable of automatically adjusting the air gap.

In order to solve the above technical problem, the present invention provides a disk type self-adjusting air gap permanent magnet flexible connection device, which comprises:

the first connecting shaft is fixed with an induction disc;

the second connecting shaft is coaxial with the first connecting shaft, and a permanent magnetic disc is axially installed on the second connecting shaft in a sliding manner;

the limiting piece is suitable for limiting the permanent magnet disc to move axially, is fixedly or integrally formed on the second connecting shaft and is positioned between the permanent magnet disc and the induction disc;

the stretching elastic piece is suitable for stretching the permanent magnet disc to the limit position farthest away from the induction disc, is relatively fixed on the second connecting shaft and is connected with the permanent magnet disc at the free end;

the centrifugal driving assembly is located one side that the response dish was kept away from to the permanent magnetism dish, including guide bar, centrifugal piece, elastic component and linkage piece, the guide bar is fixed in just follow on the second connecting axle the radial arrangement of second connecting axle, centrifugal piece slidable suit is in on the guide bar, the elastic component is suitable for and hinders the centrifugal piece is followed the guide bar moves outward, the linkage piece is fixed in on the permanent magnetism dish, the linkage piece with the centrifugal piece meets through inclined plane or conical surface, just inclined plane or conical surface are suitable for when the centrifugal piece radially moves outward order to about the linkage piece removes to the direction of keeping away from the guide bar.

Optionally, two induction discs are arranged, and the two induction discs are parallel and fixedly connected through a connecting piece; the permanent magnetic disks are provided with two corresponding induction disks and located between the two induction disks, each permanent magnetic disk is fixedly provided with a linkage block, the centrifugal block is connected with the two linkage blocks through an inclined plane or a conical surface, two ends of the stretching elastic piece are connected with the two permanent magnetic disks respectively, and the limiting pieces are provided with two corresponding permanent magnetic disks.

Optionally, the centrifugal driving assembly and the stretching elastic member are uniformly distributed along the circumferential direction of the second connecting shaft, and the centrifugal driving assembly and the stretching elastic member are arranged in a circulating and alternating manner.

Optionally, the second connecting shaft is a hollow shaft, the limiting part close to the first connecting shaft is a blocking cover fixed at the end of the second connecting shaft, and the limiting part far away from the first connecting shaft is a shaft shoulder integrally formed on the second connecting shaft.

Optionally, the tensile elastic member and/or the elastic member may be detachably mounted or adjustable in length.

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

Optionally, the end face of the induction disc, which is far away from the permanent magnet disc, is provided with heat dissipation teeth.

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

Optionally, the permanent magnetic disk includes:

the end face of the permanent magnet carrier disc, which is far away from the induction disc, is provided with an installation groove;

the permanent magnet is embedded in the mounting groove;

and the pressing plate is fixed on the permanent magnet carrier disc and is suitable for pressing the permanent magnet.

Optionally, the mounting grooves are provided with a plurality of mounting grooves and are uniformly distributed along the circumferential direction of the permanent magnet carrier disc, permanent magnets are embedded in each mounting groove, and the magnetic poles of the adjacent permanent magnets are opposite.

The technical scheme of the utility model has the following advantages:

1. the disc type self-adjusting air gap permanent magnet soft connection device provided by the utility model has the advantages that the centrifugal block is gradually moved outwards in the radial direction by utilizing the centrifugal force during rotation, the centrifugal block drives the permanent magnet disc through the linkage block and overcomes the drawing force of the drawing elastic piece to gradually approach the induction disc, so that the air gap is slowly reduced, the density of magnetic lines of force cut by the induction rotor is increased, the load torque is slowly increased, the maximum torque in a starting torque curve of the motor is utilized to drive the load to start, the no-load starting of the motor is realized, the starting current is small, the impact on the load is small, the slip difference in rated operation is small after the starting is finished, the efficiency is high, the slip difference heating of the body can be reduced, and the use safety and reliability are improved;

2. according to the disc type self-adjusting air gap permanent magnet flexible connection device provided by the utility model, the automatic adjustment of the air gap in the starting process can be realized through the matching of the stretching elastic piece, the limiting piece and the centrifugal driving assembly, and compared with the existing permanent magnet coupler with an external execution mechanism, the disc type self-adjusting air gap permanent magnet flexible connection device is low in production cost, simple in structure and light in weight, can reduce the load of a shaft, is beneficial to enabling a product to be suitable for scenes with higher rotating speed and higher power, and is beneficial to reducing vibration.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a structural sectional view of a permanent magnet flexible connection device according to an embodiment of the present invention;

FIG. 2 is a perspective view of a permanent magnet soft connection device according to an embodiment of the present invention;

FIG. 3 is a layout view of a permanent magnet according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a heat dissipation tooth according to an embodiment of the present invention;

FIG. 5 is a diagram illustrating the state of the permanent magnet soft connection device during no-load startup according to the embodiment of the present invention;

fig. 6 is a diagram illustrating a rated operation state of the permanent magnet soft connection device according to the embodiment of the present invention.

Description of reference numerals:

1. a first connecting shaft; 2. an induction disc; 21. a carrier disc; 211. a heat dissipating tooth; 22. a conductor ring; 23. a connecting member; 3. a second connecting shaft; 4. a permanent magnet disk; 41. a permanent magnet carrier disk; 42. a permanent magnet; 43. pressing a plate; 5. a limiting member; 51. a blocking cover; 52. a shaft shoulder; 6. stretching the elastic member; 7. a centrifugal drive assembly; 71. a guide bar; 72. a centrifugal block; 73. an elastic member; 74. a linkage block; 75. and a nut.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

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

Referring to fig. 1 and 2, the present embodiment provides a disk type self-adjusting air gap permanent magnet flexible connection device, including:

the induction disc 2 is fixed on the first connecting shaft 1, 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;

the second connecting shaft 3 is coaxial with the first connecting shaft 1, a permanent magnetic disc 4 can be axially and slidably mounted on the second connecting shaft 3, and the permanent magnetic disc 4 can be slidably mounted on the second connecting shaft 3 by adopting a spline, a flat key and other structures commonly used in the field;

the limiting piece 5 is suitable for limiting the permanent magnet disc 4 to move axially, and the limiting piece 5 is fixed on the second connecting shaft 3 or integrally formed on the second connecting shaft and is positioned between the permanent magnet disc 4 and the induction disc 2;

the stretching elastic piece 6 is suitable for stretching the permanent magnet disc 4 to the extreme position farthest from the induction disc 2, is relatively fixed on the second connecting shaft 3, and the free end of the stretching elastic piece 6 is connected with the permanent magnet disc 4, the stretching elastic piece 6 can be fixed on the second connecting shaft 3 directly or indirectly through other connecting pieces, the fixing means that the whole body does not change position relative to the second connecting shaft 3, but the local part can elastically deform, and the local part of the stretching elastic piece 6 is fixed on the second connecting shaft 3 in specific implementation;

the centrifugal driving assembly 7 is located on one side, far away from the induction disc 2, of the permanent magnet disc 4 and comprises a guide rod 71, a centrifugal block 72, an elastic piece 73 and a linkage block 74, wherein the guide rod 71 is fixed on the second connecting shaft 3 and is arranged along the radial direction of the second connecting shaft 3, the centrifugal block 72 is slidably sleeved on the guide rod 71, the elastic piece 73 is suitable for blocking the centrifugal block 72 from moving outwards along the guide rod 71, the linkage block 74 is fixed on the permanent magnet disc 4, the linkage block 74 is connected with 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 towards the direction far away from the guide rod 71 when the centrifugal block 72 moves outwards in the radial direction.

In the above solution, the elastic member 73 may be a tensile elastic member or a compressive elastic member, such as a tension spring, a compression spring, or an elastic cylinder. Preferably, the elastic member 73 is a compression elastic member, 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, so that the installation is more convenient. In other embodiments, a tensile elastic member may be used, but in order to prevent centrifugal block 72 from moving outward along guide rod 71, elastic member 73 is disposed on a side of centrifugal block 72 close to second connecting shaft 3, and the tensile force of elastic member forces centrifugal block 72 to move toward second connecting shaft 3. Whatever the structure of the elastic member 73, it is sufficient to ensure that the elastic member 73 acts to urge the centrifugal member 72 close to the second connecting shaft 3.

In the permanent magnet flexible connection device, the permanent magnet disc 4 is farthest away from the induction disc 2 when the permanent magnet flexible connection device is started (as shown by L0 in FIG. 5), which is equivalent to no-load starting; after the start is completed, with the increase of the rotation speed of the second connecting shaft 3, the centrifugal force applied to the centrifugal block 72 gradually increases, when the centrifugal force is greater than the resultant force of the elastic member 73 and the tensile elastic member 6 in the centrifugal force direction, the centrifugal block 72 moves outwards 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 the conical surface, so that the permanent magnet disc 4 gradually approaches the induction disc 2, at this time, the air gap between the induction disc 2 and the permanent magnet disc 4 becomes smaller, the magnetic induction increases, the load torque slowly increases, the induction disc 2 is driven to rotate, the movement stops until the permanent magnet disc 4 abuts against the limit member 5, at this time, an optimal running gap (as shown by L1 in fig. 6) is reached, and in this state, the air gap is minimum, the slip difference under the rated torque is minimum, the heat generation amount is minimum, and the efficiency is highest. The core invention of the application lies in that the structural foundation for realizing the adjustment of the air gap is not an actuating mechanism additionally arranged outside, but the automatic adjustment is realized through the cooperation of the centrifugal driving assembly 7, the limiting member 5 and the stretching elastic member 6, so that the cost is low, the structure is simple, the weight is low, the load of a shaft is reduced, and the product is favorably suitable for scenes with higher rotating speed and higher power.

Referring to fig. 1, the present embodiment provides a preferred structure: the induction discs 2 are arranged in two, the two induction discs 2 are parallel and fixedly connected through a connecting piece 23, in the embodiment, the connecting piece 23 is a plurality of connecting rods which are uniformly distributed along the circumferential direction of the induction discs 2, and thus a cage-type structure is formed; permanent magnetism dish 4 corresponds induction disk 2 and is equipped with two and is located between two induction disk 2, all is fixed with linkage block 74 on every permanent magnetism dish 4, centrifugal block 72 meets with two linkage blocks 74 simultaneously through inclined plane or conical surface, the both ends of tensile elastic component 6 are connected with two respectively permanent magnetism dish 4, locating part 5 corresponds permanent magnetism dish 4 and is equipped with two. It should be noted that, here, both ends of the elastic stretching member 6 are connected to the permanent magnetic discs 4, so that the elastic stretching member 6 can be fixed with respect to the second connecting shaft 3, and there is no need to additionally provide other structures for fixing the elastic stretching member 6, but for the structure of the single permanent magnetic disc 4, the elastic stretching member 6 needs to be partially connected to the second connecting shaft 3 to fix it with respect to the second connecting shaft 3.

By adopting the structure, on one hand, the two groups of induction rotors and the two groups of permanent magnet rotors work in a matching way, so that higher torque can be provided for a load, and the starting capability of the coupler is improved; on the other hand, the two sets of structures are symmetrically arranged, so that the centrifugal block 72 is stressed uniformly during movement, the friction force between the centrifugal block 72 and the guide rod 71 is reduced, and the whole structure moves more smoothly and reliably.

Referring to fig. 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 stop cover 51 fixed to an end of the second connecting shaft 3, and the limiting member 5 far from the first connecting shaft 1 is a shaft shoulder 52 integrally formed on the second connecting shaft 3. By adopting the structure, the two permanent magnet discs 4 can be sleeved on the second connecting shaft 3 in a clearance way during assembly, and the retaining cover 51 is installed at last, so that the installation is more convenient. Of course, in other embodiments, the limiting member 5 may also adopt other common structures, for example, a shaft ring is sleeved on the second connecting shaft 3 at the position corresponding to the two permanent magnetic disks 4 as the limiting member 5 in an interference manner, or a plurality of limiting pins are uniformly fixed on the second connecting shaft 3 along the circumferential direction as the limiting member 5.

Referring to fig. 2, the present embodiment also provides a preferred structure: the centrifugal driving assembly 7 and the stretching elastic piece 6 are uniformly distributed with a plurality of groups along the circumferential direction of the second connecting shaft 3, and the centrifugal driving assembly 7 and the stretching elastic piece 6 are circularly and alternately arranged. By adopting the structure, the force applied to the permanent magnetic disk 4 in the circumferential direction is uniform, so that the permanent magnetic disk 4 can slide on the second connecting shaft 3 more stably.

Referring to fig. 1 and 2, this embodiment provides a preferred mounting means where the tensile elastic member 6 and/or the elastic member 73 are detachably mounted or adjustable in length. Specifically, a mounting structure commonly used in the art may be adopted, and for example, the mounting structure of the elastic member 6 in fig. 1 may be: a lock catch is fixed on the permanent magnetic disk 4, and then the end part of the stretching elastic piece 6 is hooked on the lock catch to realize detachable installation; or the installation structure of the elastic member 73 in fig. 1: a nut 75 is screwed at the outer end of the guide rod 71, one end of the elastic piece 73 is abutted against the centrifugal block 72, and the other end is abutted against the nut 75; or the lock catch in the first scheme is a structure with adjustable length. By adopting such a structure, the elasticity of the tension elastic member 6 and/or the elastic member 73 can be adjusted according to different motors, thereby adapting to motors of different stages.

Referring to fig. 1, as a further improvement of the above technical solution, a first-stage stepped hole is arranged in the centrifugal block 72, a small-diameter hole gap of the first-stage stepped hole is sleeved on the guide rod 71, a large-diameter hole of the first-stage stepped hole is located outside the small-diameter hole, and one end of the elastic member 73 abuts against a stepped surface of the first-stage stepped hole. By adopting the structure, the large-diameter hole of the primary stepped hole can limit the elastic piece 73, and the elastic piece 73 is directly abutted to the position of the centrifugal block 72 close to the second connecting shaft 3, so that the driving is more stable.

Referring to fig. 4, the present embodiment also provides a preferred structure of the inductive disk 2: the end face, far away from the permanent magnetic disk 4, of the induction disk 2 is provided with heat dissipation teeth 211. Because the permanent magnetic disk 4 and the induction disk 2 need to have certain slip rotating speed in the transmission process, slip loss is generated in the operation process, and heat is generated and dissipated. By adopting such a structure, the heat dissipation teeth 211 can improve the heat dissipation efficiency of the induction disk 2. Preferably, the heat dissipation teeth 211 are a plurality of coaxially arranged ring-shaped teeth, so that the heat dissipation efficiency can be further improved.

Referring to fig. 1, the present embodiment also provides a preferred permanent magnet disc 4 structure, including:

the permanent magnet carrier disc 41 is provided with an installation groove on the end face far away from the induction disc 2;

the permanent magnet 42 is embedded in the mounting groove;

and the pressing plate 43 is fixed on the permanent magnet carrier disc 41 and is suitable for pressing the permanent magnet 42.

Specifically, the pressing plate 43 is an annular plate and is fixed to the permanent magnet carrier plate 41 by bolts.

Through adopting above-mentioned structure, during the assembly at first imbed permanent magnet 42 in the mounting groove, then fix clamp plate 43 and accomplish compressing tightly permanent magnet 42 on permanent magnet carrier dish 41, simple to operate, it is fixed reliable.

Referring to fig. 3, preferably, the mounting grooves are provided in plurality and uniformly distributed along the circumferential direction of the permanent magnet carrier disk 41, each mounting groove is embedded with a permanent magnet 42, and the magnetic poles of adjacent permanent magnets 42 are opposite.

Specifically, the groove shape of the mounting groove can be any of a sector shape, a circular shape, a rectangular shape and the like, and a sector ring shape is preferably adopted.

In this embodiment, the conductor ring is made of a material with high conductivity, such as aluminum (alloy), copper (alloy), etc.; the carrier disc is made of a non-magnetic material and has good heat dissipation, such as aluminum (alloy); the permanent magnet 42 is made of rare earth permanent magnet material; the pressing plate 43 is made of non-magnetic conductive material such as stainless steel or aluminum (alloy); the permanent magnet carrier disk 41 is made of non-magnetic conductive material, such as stainless steel or aluminum (alloy); the linkage block 74 and the eccentric block 72 may be made of a magnetic material or a non-magnetic material.

As a specific implementation form, the working process of the permanent magnet flexible connection device of the utility model is as follows:

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

Referring to fig. 5, at the time of starting, the two permanent magnet discs 4 approach each other under the tensile force of the tensile elastic member 6 until reaching an equilibrium, at which time the air gap between the permanent magnet discs 4 and the induction disc 2 is the largest, which is LO, and starting in this state is equivalent to no-load starting.

After the centrifugal disc is started, the centrifugal force borne by the centrifugal block 72 is increased along with the increase of the rotating speed of the second connecting shaft 3, when the centrifugal force borne by the centrifugal block 72 is greater than the resultant force of the elastic piece 73 and the tensile elastic piece 6 in the centrifugal force direction, the centrifugal block 72 moves outwards along the guide rod 71, and because the centrifugal block 72 is in contact with the linkage block 74 through an inclined surface or a conical surface, the linkage block 74 can move towards the direction far away from the guide rod 71 along the axial direction of the second connecting shaft 3 along with the centrifugal block 72 synchronously, so that the air gap between the permanent magnetic disc 4 and the induction disc 2 is reduced, the torque is increased, and the load is driven to rotate.

The two permanent magnet discs 4 are separated from each other by the centrifugal block 72 until the permanent magnet discs 4 stop moving when abutting against the corresponding limit pieces 5, at which time the air gap between the permanent magnet discs 4 and the induction disc 2 is the smallest, L1, at which time the efficiency is the highest and the heat generation is the smallest, as shown in fig. 6, this state is the rated operation state.

When the machine is stopped, the rotation speed of the second connecting shaft 3 is reduced, the centrifugal block 72 is subjected to a centrifugal force which is not enough to overcome the resultant force of the elastic member 73 and the tensile elastic member 6 in the centrifugal force direction, so that the centrifugal block 72 slides inwards along the guide rod 71 until reaching a limit position, and at the same time, the two permanent magnet discs 4 are also reset to the state shown in fig. 5 under the action of the tensile elastic member 6.

In the above, the permanent magnet flexible connector is used as a soft starter for related description, but in actual use, the permanent magnet flexible connector can also be used as a torque limiter, and the specific principle is as follows:

first, the first connecting shaft 1 is connected to the drive end, and the second connecting shaft 3 is connected to the load end.

When the load end is overloaded and locked, the centrifugal block 72 loses the centrifugal force effect, the two permanent magnetic disks 4 approach to each other under the action of the stretching elastic piece 6, the air gap between the induction disk 2 and the permanent magnetic disks 4 is increased until the permanent magnetic disks 4 move to the limit position farthest from the induction disk 2, the eddy current coupling is changed into weak coupling due to the increase of the coupling distance, so that the torque transmission between the motor and the load is cut off, the motor is unloaded, the load shafting has no torque and torque transmission, the torque limiting effect is realized, and the whole shafting is protected.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.

Claims (10)

1. A disc type self-adjusting air gap permanent magnet flexible connection device is characterized by comprising:

the first connecting shaft (1) is fixed with an induction disc (2);

the second connecting shaft (3) is coaxial with the first connecting shaft (1), and a permanent magnetic disc (4) is axially installed on the second connecting shaft (3) in a sliding mode;

the limiting piece (5) is suitable for limiting the permanent magnet disc (4) to move axially, and the limiting piece (5) is fixed on the second connecting shaft (3) or integrally formed on the second connecting shaft and is positioned between the permanent magnet disc (4) and the induction disc (2);

the stretching elastic piece (6) is suitable for stretching the permanent magnet disc (4) to the extreme position farthest away from the induction disc (2), is relatively fixed on the second connecting shaft (3), and has a free end connected with the permanent magnet disc (4);

the centrifugal driving assembly (7) is located one side, far away from the induction disc (2), of the permanent magnet disc (4) and comprises a guide rod (71), a centrifugal block (72), an elastic piece (73) and a linkage block (74), wherein the guide rod (71) is fixed to the second connecting shaft (3) and arranged along the radial direction of the second connecting shaft (3), the centrifugal block (72) is slidably sleeved on the guide rod (71), the elastic piece (73) is suitable for blocking the centrifugal block (72) to move outwards along the guide rod (71), the linkage block (74) is fixed to the permanent magnet disc (4), the linkage block (74) is connected with 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 towards the direction far away from the guide rod (71) when the centrifugal block (72) moves outwards in the radial direction.

2. The disc type self-adjusting air gap permanent magnet flexible connection device according to claim 1, characterized in that two induction discs (2) are provided, and the two induction discs (2) are parallel and fixedly connected through a connecting piece (23); permanent magnetism dish (4) are equipped with two and are located between two response dishes (2) corresponding response dish (2), all are fixed with linkage block (74) on every permanent magnetism dish (4), centrifugal block (72) meet with two linkage blocks (74) simultaneously through inclined plane or conical surface, the both ends of tensile elastic component (6) are respectively with two permanent magnetism dish (4) are connected, locating part (5) correspond permanent magnetism dish (4) and are equipped with two.

3. The disc type self-adjusting air gap permanent magnet flexible connection device according to claim 1 or 2, characterized in that the centrifugal drive assembly (7) and the tensile elastic member (6) are distributed in multiple groups along the circumferential direction of the second connection shaft (3), and the centrifugal drive assembly (7) and the tensile elastic member (6) are arranged in a cyclic and alternate manner.

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

5. The disc type self-adjusting air gap permanent magnet soft connection device according to claim 1, characterized in that the tensile elastic member (6) and/or the elastic member (73) is detachably mounted or adjustable in length.

6. The disc type self-adjusting air gap permanent magnet flexible connection device according to claim 5, characterized in that the elastic member (73) is a compression elastic member, a nut (75) is screwed on the outer end of the guide rod (71), one end of the elastic member (73) abuts against the eccentric block (72), and the other end abuts against the nut (75).

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

8. The disc type self-adjusting air gap permanent magnet soft connection device according to claim 7, characterized in that the heat dissipating teeth (211) are a plurality of coaxially arranged ring-shaped teeth.

9. The disc type self-adjusting air gap permanent magnet soft connection device according to claim 1, characterized in that the permanent magnet disc (4) comprises:

the end face, far away from the induction disc (2), of the permanent magnet carrier disc (41) is provided with an installation groove;

the permanent magnet (42) is embedded in the mounting groove;

and the pressing plate (43) is fixed on the permanent magnet carrier disc (41) and is suitable for pressing the permanent magnet (42).

10. The disc type self-adjusting air gap permanent magnet flexible connection device according to claim 9, wherein the mounting grooves are provided in a plurality and are uniformly distributed along the circumferential direction of the permanent magnet carrier disc (41), each mounting groove is embedded with a permanent magnet (42), and the magnetic poles of the adjacent permanent magnets (42) are opposite.

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