CN113644808B - A disc-type self-adjusting air gap permanent magnetic soft connection device - Google Patents

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

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

Technical Field

The invention 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 hydraulic coupler or a soft starter is generally added between the motor and the load. The hydraulic coupler can delay the starting time of the motor and slow down the starting impact, but has the problems of low efficiency, oil leakage and large occupied space, and the conventional soft starter can realize the soft start of the system, but all the conventional soft starter needs a special control system, has a complex structure and is inconvenient to maintain.

For this reason, permanent magnet couplers have been developed on the market that are dedicated to solving the above-mentioned problems. The existing permanent magnet coupler mainly comprises a disc type permanent magnet coupler and a cylinder type permanent magnet coupler. The induction rotor and the permanent magnet rotor of the disc type permanent magnet coupler are axially provided with a certain air gap, and the induction rotor and the permanent magnet rotor of the cylinder type permanent magnet coupler are radially provided with a certain air gap. The two permanent magnet couplers depend on the conductor in the induction rotor to cut the magnetic induction line generated by the magnetic steel in the permanent magnet rotor to generate an induced magnetic field, and the two groups of magnetic fields interact to transfer torque.

In order to improve efficiency, the slip ratio of the existing permanent magnet coupler is generally not more than 4%, namely, slip is not more than 60rpm under rated torque, because if the slip ratio is higher, induction disc heating is serious, and efficiency is reduced. However, the low slip ratio can lead the permanent magnet coupler to reach rated torque at the moment of starting the motor, the system has large starting impact, the motor can not drive a load to generate a 'stuffy machine', or the motor can instantly exceed the maximum torque and runs at high slip all the time beyond the optimal running slip rotating speed of the coupler, the running efficiency is low, the heating is serious, and in addition, the motor can be overloaded and can not be started for the load with large starting inertia. In order to solve the problems, an external actuator is additionally arranged on a part of the permanent magnet coupler for adjusting an air gap so as to adjust the slip, but the structure is complex, the weight is heavy, the additional moment of inertia is increased, and the additional vibration factor for high-speed or high-power equipment is difficult to eliminate.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defects of complex structure and heavy weight of the permanent magnet coupler with the adjustable air gap in the prior art, thereby providing the disc type permanent magnet soft connection device capable of self-adjusting the air gap.

In order to solve the technical problems, the invention provides a disc type self-adjusting air gap permanent magnet soft connection device, which comprises:

the first connecting shaft is fixedly provided with an induction disc;

the second connecting shaft is coaxial with the first connecting shaft, and a permanent magnetic disk is axially slidably arranged on the second connecting shaft;

The limiting piece is suitable for limiting the axial movement of the permanent magnet disc, is fixed 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 magnetic disk to the limit position farthest from the induction disk, is relatively fixed on the second connecting shaft and is connected with the permanent magnetic disk at the free end;

The centrifugal driving assembly is positioned on one side of the permanent magnetic disc, far away from the induction disc, and comprises a guide rod, a centrifugal block, an elastic piece and a linkage block, wherein the guide rod is fixed on the second connecting shaft and is radially arranged along the second connecting shaft, the centrifugal block is slidably sleeved on the guide rod, the elastic piece is suitable for blocking the centrifugal block from moving outwards along the guide rod, the linkage block is fixed on the permanent magnetic disc, the linkage block is connected with the centrifugal block through an inclined plane or a conical surface, and the inclined plane or the conical surface is suitable for driving the linkage block to move towards a direction far away from the guide rod when the centrifugal block moves outwards in a radial way.

The two permanent magnet discs are arranged in parallel and fixedly connected through a connecting piece, two permanent magnet discs are arranged corresponding to the two induction discs and are positioned between the two induction discs, each permanent magnet disc is fixedly provided with a linkage block, the centrifugal blocks are simultaneously connected with the two linkage blocks through inclined planes or conical surfaces, two ends of the stretching elastic piece are respectively connected with the two permanent magnet discs, and two limiting pieces are arranged corresponding to the two permanent magnet discs.

Optionally, the centrifugal driving assembly and the stretching elastic piece are uniformly distributed with a plurality of groups along the circumference of the second connecting shaft, and the centrifugal driving assembly and the stretching elastic piece are circularly and alternately arranged.

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 part of the second connecting shaft, and the limiting part far away from the first connecting shaft is an integrally formed shaft shoulder on the second connecting shaft.

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

Optionally, the elastic component is compression elastic component, the nut is twisted to the outer end of guide bar, elastic component one end butt centrifugal piece, the other end butt nut.

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

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

Optionally, the permanent magnet disc includes:

The end face of the permanent magnet carrier disc, which is far away from the induction disc, is provided with a mounting 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, each mounting groove is internally embedded with a permanent magnet, and the magnetic poles of the adjacent permanent magnets are opposite.

The technical scheme of the invention has the following advantages:

1. According to the disc type self-adjusting air gap permanent magnet flexible connection device provided by the invention, the centrifugal blocks are gradually moved outwards in the radial direction by utilizing the centrifugal force during rotation, the centrifugal blocks drive the permanent magnet disc through the linkage blocks and overcome the stretching force of the stretching elastic piece to gradually approach the induction disc, so that the air gap is slowly reduced, the density of magnetic force lines cut by the induction rotor is increased, the load torque is slowly increased, the maximum torque in a motor starting torque curve is utilized to drive the load to start, no-load starting of the motor is realized, the starting current is small, the load impact is small, the slip is small during rated running after the starting is completed, the efficiency is high, the slip heating of a 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, the automatic adjustment of the air gap in the starting process can be realized through the cooperation of the stretching elastic piece, the limiting piece and the centrifugal driving assembly, compared with a permanent magnet coupler of an existing peripheral 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 lighten 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 that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a cross-sectional view of a permanent magnet flexible connection unit according to an embodiment of the present invention;

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

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

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

FIG. 5 is a state diagram of the permanent magnet soft connection device in the embodiment of the invention during idle starting;

fig. 6 is a state diagram of the permanent magnet soft connection device in the embodiment of the invention in the rated operation.

Reference numerals illustrate:

1. The device comprises a first connecting shaft, 2 parts of an induction disc, 21 parts of a carrier disc, 211 parts of a heat dissipation tooth, 22 parts of a conductor ring, 23 parts of a connecting piece, 3 parts of a second connecting shaft, 4 parts of a permanent magnet disc, 41 parts of a permanent magnet carrier disc, 42 parts of a permanent magnet, 43 parts of a pressing plate, 5 parts of a limiting piece, 51 parts of a blocking cover, 52 parts of a shaft shoulder, 6 parts of a stretching elastic piece, 7 parts of a centrifugal driving assembly, 71 parts of a guide rod, 72 parts of a centrifugal block, 73 parts of an elastic piece, 74 parts of a linkage block, 75 parts of a nut.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements 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, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

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

Referring to fig. 1 and 2, the disc-type self-adjusting air gap permanent magnet soft connection device provided in this embodiment includes:

a first connecting shaft 1 on which an induction plate 2 is fixed, the induction plate 2 including a carrier plate 21 and a conductor ring 22, the carrier plate 21 being fixed on the first connecting shaft 1, the conductor ring 22 being fixed on the carrier plate 21;

The second connecting shaft 3 is coaxial with the first connecting shaft 1, a permanent magnet disc 4 is axially slidably arranged on the second connecting shaft 3, and the permanent magnet disc 4 is slidably arranged on the second connecting shaft 3 by adopting common structures in the field, such as a spline, a flat key and the like;

The limiting piece 5 is suitable for limiting the axial movement of the permanent magnet disc 4, and the limiting piece 5 is fixed or integrally formed on the second connecting shaft 3 and is positioned between the permanent magnet disc 4 and the induction disc 2;

The stretching elastic member 6 is suitable for pulling the permanent magnetic disc 4 to the extreme position farthest from the induction disc 2, relatively fixed on the second connecting shaft 3, and the free end of the stretching elastic member is connected with the permanent magnetic disc 4, the stretching elastic member 6 can adopt common structures such as a tension spring, an elastic rope and the like, the stretching elastic member 6 can be directly or indirectly fixed on the second connecting shaft 3 through other connecting members, the fixing means that the whole body does not change in position relative to the second connecting shaft 3, but the part of the stretching elastic member can be elastically deformed, and the part of the stretching elastic member 6 can be fixed on the second connecting shaft 3 in specific implementation;

The centrifugal driving assembly 7 is located at one side of the permanent magnet disc 4 far away from the induction disc 2, 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 preventing 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 in a direction far away from the guide rod 71 when the centrifugal block 72 moves outwards in a radial direction.

In the above-mentioned embodiments, the elastic member 73 may be a tensile elastic member or a compressive elastic member, for example, a tension spring, a compression spring, or an elastic tube. 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 spring may be used, but to prevent the centrifugal mass 72 from moving outwards along the guide rod 71, the spring 73 needs to be disposed on the side of the centrifugal mass 72 close to the second connecting shaft 3, and the pulling force of the spring forces the centrifugal mass 72 to move towards the second connecting shaft 3. Whatever the structure of the elastic member 73, it is only necessary to ensure that the elastic member 73 functions to drive the centrifugal member 72 to approach the second connecting shaft 3.

According to the permanent magnet flexible connection device, the distance between the permanent magnet disc 4 and the induction disc 2 is farthest (shown as L0 in fig. 5) during starting, which is equivalent to no-load starting, after starting, the centrifugal force borne by the centrifugal block 72 gradually increases along with the increase of the rotating speed of the second connection shaft 3, when the centrifugal force is larger than the resultant force of the elastic piece 73 and the stretching elastic piece 6 in the centrifugal force direction, the centrifugal block 72 moves outwards along the guide rod 71, the centrifugal block 72 drives the linkage block 74 to axially move along the second connection shaft 3 through the inclined surface or the conical surface, so that the permanent magnet disc 4 gradually approaches the induction disc 2, at the moment, the air gap between the induction disc 2 and the permanent magnet disc 4 is smaller, the magnetic induction is increased, the load torque is slowly increased, the induction disc 2 is driven to rotate, the permanent magnet disc 4 stops moving when abutting against the limiting piece 5, at the moment, the optimal running gap is reached (shown as L1 in fig. 6), the air gap is minimum, the rated torque is minimum, the heat productivity is minimum, and the efficiency is highest. The application has the core that the structural foundation on which the adjustment of the air gap is realized is not an externally added actuating mechanism, but the automatic adjustment is realized through the cooperation of the centrifugal driving assembly 7, the limiting piece 5 and the stretching elastic piece 6, so that the application has the advantages of low cost, simple structure and low weight, reduces the load of the shaft, and is beneficial to enabling the product to be suitable for scenes with higher rotating speed and higher power.

Referring to fig. 1, the embodiment provides a preferred structure, in which two induction plates 2 are arranged, the two induction plates 2 are parallel and fixedly connected through a connecting piece 23, in this embodiment, the connecting piece 23 is a plurality of connecting rods uniformly distributed along the circumferential direction of the induction plates 2, so as to form a cage structure, two permanent magnet plates 4 are arranged corresponding to the induction plates 2 and are positioned between the two induction plates 2, a linkage block 74 is fixed on each permanent magnet plate 4, the centrifugal block 72 is simultaneously connected with the two linkage blocks 74 through an inclined plane or a conical surface, two ends of the tensile elastic piece 6 are respectively connected with the two permanent magnet plates 4, and two limiting pieces 5 are arranged corresponding to the permanent magnet plates 4. It should be noted that, both ends of the stretching elastic member 6 are connected to the permanent magnetic disc 4, so that the fixing of the stretching elastic member 6 with respect to the second connecting shaft 3 can be achieved, and no additional structure is needed to fix the stretching elastic member 6, but for the structure of the Shan Yongci disc 4, the stretching elastic member 6 needs to be partially connected to the second connecting shaft 3 to achieve the fixing thereof 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 are matched to work, so that larger torque can be provided for a load, the starting capability of the coupler is improved, and on the other hand, the two groups of structures are symmetrically arranged, so that stress is uniform when the centrifugal block 72 moves, 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 blocking cover 51 fixed at the 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, when in assembly, the two permanent magnet discs 4 can be sleeved on the second connecting shaft 3 at intervals, and finally the retaining cover 51 is installed, so that the installation is more convenient. Of course, in other embodiments, other common structures may be adopted for the limiting member 5, for example, a shaft collar is sleeved on the second connecting shaft 3 corresponding to the two permanent magnet discs 4 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 further provides a preferable structure that the centrifugal driving assembly 7 and the stretching elastic member 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 member 6 are circularly and alternately arranged. By adopting this structure, the permanent magnet disc 4 is uniformly stressed in the circumferential direction, so that the permanent magnet disc 4 slides on the second connecting shaft 3 more stably.

Referring to fig. 1 and 2, the present embodiment provides a preferred installation mode, and the tensile elastic member 6 and/or the elastic member 73 are detachably installed or have an adjustable length. Specifically, the installation structure of the stretching elastic member 6 in the prior art may be adopted, for example, the installation structure of the stretching elastic member 6 in fig. 1 may be that a lock catch is fixed on the permanent magnetic disk 4, then the end portion of the stretching elastic member 6 is hooked on the lock catch to realize detachable installation, or the installation structure of the elastic member 73 in fig. 1 may be that a nut 75 is screwed at 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 catch in the first scheme is a structure with adjustable length. By adopting such a structure, the elastic force of the stretching 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 provided in the centrifugal block 72, a small-diameter hole of the first-stage stepped hole is sleeved on the guide rod 71 in a clearance manner, 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 first-stage stepped hole has a limiting effect on the elastic piece 73, and the elastic piece 73 is directly abutted against the position of the centrifugal block 72, which is close to the second connecting shaft 3, so that the driving is more stable.

Referring to fig. 4, the present embodiment further provides a preferred structure of the induction disc 2, in which the end surface of the induction disc 2 far from the permanent magnetic disc 4 is provided with heat dissipation teeth 211. Because the permanent magnet disc 4 and the induction disc 2 need to have a certain slip rotation speed in the transmission process, slip loss and heat dissipation can be generated in the operation process. By adopting this structure, the heat radiation teeth 211 can improve the heat radiation efficiency of the induction disk 2. Preferably, the heat dissipating teeth 211 are a plurality of annular teeth coaxially arranged, so as to further improve heat dissipating efficiency.

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

a permanent magnet carrier plate 41, the end surface of which, away from the induction plate 2, is provided with a mounting groove;

A permanent magnet 42 fitted in the mounting groove;

A pressing plate 43 fixed on the permanent magnet carrier plate 41 and adapted to press the permanent magnets 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, at first with permanent magnet 42 embedding mounting groove in the time of the assembly, then fix clamp plate 43 on permanent magnet carrier plate 41 and accomplish the compress tightly to permanent magnet 42, simple to operate, fixed reliable.

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

Specifically, the groove shape of the mounting groove can be fan-shaped, round, rectangular and the like, and a fan ring shape is preferably adopted.

In this embodiment, the conductor ring is made of a material with high conductivity, such as aluminum (alloy) and copper (alloy), the carrier plate is made of a non-magnetic material with good heat dissipation, such as aluminum (alloy), the permanent magnet 42 is made of a rare earth permanent magnet material, the pressing plate 43 is made of a non-magnetic material, such as stainless steel or aluminum (alloy), the permanent magnet carrier plate 41 is made of a non-magnetic material, such as stainless steel or aluminum (alloy), and the linkage block 74 and the centrifugal block 72 are 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 invention is as follows:

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

Referring to fig. 5, during start-up, the two permanent magnet discs 4 approach each other under the tensile force of the tensile elastic member 6 until equilibrium is reached, at which time the air gap between the permanent magnet disc 4 and the induction disc 2 is maximized, LO, and this state start-up corresponds to no-load start-up.

After starting, as the rotation speed of the second connecting shaft 3 increases, the centrifugal force borne by the centrifugal block 72 increases, when the centrifugal force borne by the centrifugal block is greater than the resultant force of the elastic member 73 and the stretching elastic member 6 in the centrifugal force direction, the centrifugal block 72 moves outwards along the guide rod 71, and the centrifugal block 72 and the linkage block 74 are contacted through an inclined plane or a conical surface, so that the linkage block 74 moves along the axial direction of the second connecting shaft 3 along the direction away from the guide rod 71 synchronously with the centrifugal block 72, thereby reducing the air gap between the permanent magnet disc 4 and the induction disc 2, increasing the torque, and further driving the load to rotate.

The two permanent magnetic disks 4 are mutually far away under the action of the centrifugal block 72 until the permanent magnetic disks 4 abut against the corresponding limiting piece 5 to stop moving, at the moment, the air gap between the permanent magnetic disks 4 and the induction disk 2 is minimum, namely L1, at the moment, the efficiency is highest, and the heating is minimum, as shown in fig. 6, and the state is the rated running state.

When the machine is stopped, the rotation speed of the second connecting shaft 3 is reduced, the centrifugal force applied to the centrifugal block 72 is insufficient to overcome the resultant force of the elastic member 73 and the stretching elastic member 6 in the centrifugal force direction, so that the centrifugal block 72 can slide inwards along the guide rod 71 until reaching the limit position, and at the moment, the two permanent magnet disks 4 are reset to the state shown in fig. 5 under the action of the stretching elastic member 6.

The above description is related to the use of the permanent magnet soft connection device as a soft starter, but in practical use, the permanent magnet soft connection device 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 suddenly overloads and stalls, the centrifugal block 72 loses the centrifugal force effect, the two permanent magnet disks 4 are mutually close under the action of the stretching elastic piece 6, the air gap between the induction disk 2 and the permanent magnet disk 4 is increased until the permanent magnet disk 4 moves to the extreme position farthest from the induction disk 2, at the moment, the eddy current coupling becomes 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 is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.

Claims (10)

1. A disc self-adjusting air gap permanent magnet flexible connection device, comprising:

A first connecting shaft (1) on which an induction disk (2) is fixed;

The second connecting shaft (3) is coaxial with the first connecting shaft (1), and a permanent magnetic disk (4) is axially slidably arranged on the second connecting shaft (3);

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

A stretching elastic piece (6) which is suitable for pulling the permanent magnetic disk (4) to the extreme position farthest from the induction disk (2), is relatively fixed on the second connecting shaft (3) and the free end of the stretching elastic piece is connected with the permanent magnetic disk (4);

Centrifugal drive assembly (7), be located one side that induction disc (2) was kept away from to permanent magnet disc (4), including guide bar (71), centrifugal piece (72), elastic component (73) and linkage piece (74), guide bar (71) are fixed in on second connecting axle (3) and along the radial arrangement of second connecting axle (3), centrifugal piece (72) slidable suit is in on guide bar (71), elastic component (73) are suitable for the hindrance centrifugal piece (72) are followed guide bar (71) is outer to be moved, linkage piece (74) are fixed in on permanent magnet disc (4), linkage piece (74) with centrifugal piece (72) meet through inclined plane or conical surface, just inclined plane or conical surface are suitable for order about centrifugal piece (74) to move to the direction of keeping away from guide bar (71) when centrifugal piece (72) radially outwards move.

2. The disc-type self-adjusting air gap permanent magnet flexible connection device according to claim 1, wherein two induction discs (2) are arranged and are fixedly connected through connecting pieces (23), two permanent magnet discs (4) are arranged corresponding to the induction discs (2) and are located between the two induction discs (2), a linkage block (74) is fixed on each permanent magnet disc (4), the centrifugal block (72) is simultaneously connected with the two linkage blocks (74) through an inclined surface or a conical surface, two ends of the stretching elastic piece (6) are respectively connected with the two permanent magnet discs (4), and two limiting pieces (5) are arranged corresponding to the permanent magnet discs (4).

3. Disc self-adjusting air gap permanent magnet soft connection device according to claim 1 or 2, characterized in that the centrifugal drive assembly (7) and the stretching elastic member (6) are uniformly distributed with a plurality of groups along the circumference of the second connection shaft (3), and the centrifugal drive assembly (7) and the stretching elastic member (6) are circularly and alternately arranged.

4. The disc type self-adjusting air gap permanent magnet soft connecting device according to claim 2, wherein the second connecting shaft (3) is a hollow shaft, the limiting piece (5) close to the first connecting shaft (1) is a blocking cover (51) fixed at the end part of the second connecting shaft (3), and the limiting piece (5) far away from the first connecting shaft (1) is a shaft shoulder (52) integrally formed on the second connecting shaft (3).

5. A disc self-adjusting air gap permanent magnet soft connection according to claim 1, characterized in that the tensile spring (6) and/or the spring (73) are detachably mounted or adjustable in length.

6. The disc type self-adjusting air gap permanent magnet soft connection device according to claim 5, wherein the elastic piece (73) is a compression elastic piece, 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 of the elastic piece is abutted against the nut (75).

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

8. A disc 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 teeth.

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

a permanent magnet carrier disc (41), the end surface of which, far from the induction disc (2), is provided with a mounting groove;

A permanent magnet (42) embedded in the installation groove;

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

10. A disc-type self-adjusting air gap permanent magnet flexible connection device according to claim 9, characterized in that 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 (41), each mounting groove is embedded with a permanent magnet (42), and the magnetic poles of the adjacent permanent magnets (42) are opposite.