CN113437837B - Anti-friction disc alarm device, disc type permanent magnet eddy current coupling and alarm method thereof - Google Patents

Abstract

The invention relates to an anti-friction disc alarm device, a disc type permanent magnet eddy current coupling and an alarm method thereof, which are arranged on a magnetic transmission device with a driving disc and a driven disc, and comprise the following components: the anti-friction disc assembly is arranged on the driving disc or the driven disc and is positioned on one side, opposite to the driven disc, of the driving disc, when the driving disc and the driven disc are displaced in the axial direction in the opposite direction, a gap between the driving disc and the driven disc is smaller than a preset gap, and the anti-friction disc assembly eliminates the friction resistance and the axial pressure between the driving disc and the driven disc; and the at least one alarm component is arranged corresponding to the anti-friction disc component, and when the clearance between the driving disc and the driven disc is smaller than the safety clearance, the corresponding alarm component is triggered to alarm.

Description

Anti-friction disc alarm device, disc type permanent magnet eddy current coupling and alarm method thereof

Technical Field

The invention relates to an anti-friction disc alarm device, in particular to an anti-friction disc alarm device for a disc type permanent magnet eddy current coupling and an alarm method thereof.

Background

As a novel product, the disc type permanent magnet eddy current coupling has the structural characteristics of small and exquisite structure, light weight, small vibration, high energy efficiency of permanent magnet materials, small eddy current loss and the like, and is favored by the market due to the advantages of energy conservation and noise reduction, and is applied to various industries.

However, in practical use, due to the influence of various factors, the driving disc and the driven disc of the disc-type permanent magnet eddy current coupling are easy to axially move, deviate from the preset clearance distance, gradually approach to each other until friction occurs, and disc-wiping accidents occur. If the light person can not be found in time, the light person can cause the damage of the product, and the serious person can cause the safety accident. How to effectively solve the problem of cleaning the disc is always a difficult problem in the same industry.

Therefore, in order to solve the defects, the invention particularly provides a device capable of preventing the disc-type permanent magnet eddy current coupling from disc wiping, and meanwhile, a disc wiping alarm device is additionally arranged, when the driving disc and the driven disc exceed a set safety clearance, an alarm switch is triggered, and the alarm emits light and sounds to give an alarm, thereby drawing attention of personnel, maintaining and protecting in time and avoiding safety accidents.

Disclosure of Invention

The invention provides a scratch prevention alarm device aiming at the technical problems.

In order to achieve the purpose, the invention adopts the technical scheme that:

the invention provides a scratch prevention disc alarm device, which is arranged on a magnetic transmission device with a driving disc and a driven disc, and comprises:

and the anti-friction disc assembly is arranged on the driving disc or the driven disc and is positioned on one side of the driving disc opposite to the driven disc, when the driving disc and the driven disc generate axial opposite displacement, the clearance between the driving disc and the driven disc is less than or equal to a preset clearance D2, and the anti-friction disc assembly eliminates the friction resistance and the axial pressure between the driving disc and the driven disc.

And the at least one alarm component is arranged corresponding to the anti-friction disc component, and when the driving disc and the driven disc generate axial opposite displacement, the clearance between the driving disc and the driven disc is less than or equal to a safety clearance D3, and the corresponding alarm component is triggered to alarm.

Preferably, in the above anti-scrub warning apparatus, the anti-scrub disc assembly includes: the front end part of the anti-wiping disc is arranged in a through hole in the driving disc and movably protrudes out of the surface of the driving disc, the pressure relief part is arranged in the through hole, and the front end of the pressure relief part contacts the front end part of the anti-wiping disc and blocks the front end part of the anti-wiping disc in the through hole.

Preferably, in the anti-friction disc alarm device, the anti-friction front end component is a sphere, and the sphere is rotatably disposed in the through hole.

Preferably, in the above anti-scrub disc alarm device, the pressure relief component includes a stepped columnar thimble and a spring, the spring is enclosed outside the thimble, and one end of the spring is pressed against the stepped portion of the thimble.

Preferably, in the above anti-scrub warning device, the anti-scrub warning device further includes a plugging device, the plugging device is a cover plate, the cover plate is fixedly disposed on the through hole of the driving disk and located on the outer side of the side, opposite to the driven disk, of the driving disk, and the other end of the spring is pressed against the cover plate.

Preferably, in the above anti-friction disc alarm device, the diameter of the through hole in the driving disc at the outlet on the opposite side of the driving disc and the driven disc is smaller than the diameter of the sphere.

Preferably, in the anti-disc-wiping alarm device, the alarm component comprises an alarm, and the pressure relief component is pushed to trigger the alarm to give an alarm;

still include a battery pack, battery pack connects the alarm, works as pressure relief part axial displacement surpasss safety clearance D3, battery pack switches on the power, supplies the alarm reports to the police.

The invention also provides a disc permanent magnet eddy current coupling comprising: the anti-friction disc alarm device comprises a driving disc and a driven disc, a preset gap D1 is formed between the driving disc and the driven disc, and any one of the anti-friction disc alarm devices is further arranged on the driving disc or the driven disc.

The invention also provides a disc-wiping prevention warning method for the disc-type permanent magnet eddy current coupler, wherein the disc-type permanent magnet eddy current coupler comprises the following steps: the anti-friction disc alarming method comprises the following steps of:

(1) when the driving disc and the driven disc are displaced in the axial direction, the clearance between the driving disc and the driven disc is smaller than the preset clearance D2, and the friction resistance between the driving disc and the driven disc is eliminated through the anti-friction disc assembly;

(2) axial pressure from the driven disc is transmitted to the anti-friction disc assembly, and the anti-friction disc assembly counteracts the axial pressure so as to prevent the driving disc and the driven disc from approaching;

(3) when the distance between the driving disc and the driven disc is further reduced to be smaller than a safety clearance D3, the anti-friction disc assembly triggers the alarm assembly to give an alarm.

Drawings

FIG. 1 is a schematic cross-sectional view of an anti-scrub alarm device in accordance with an embodiment of the present invention;

FIG. 2 is a perspective view of an embodiment of the present invention;

FIG. 3 is a perspective view of another embodiment of the present invention;

FIG. 4 is a schematic view of the movement direction of the anti-scuffing plate alarm device;

FIG. 5 is a schematic side cross-sectional view of a disc permanent magnet eddy current coupling of the present invention;

FIG. 6 is a side perspective view of the disc permanent magnet eddy current coupling of the present invention;

FIG. 7 is a perspective view of FIG. 6 from another perspective;

FIG. 8 is a schematic diagram of the components of an anti-scrub warning unit in accordance with an embodiment of the present invention;

fig. 9 is another view of fig. 8.

In the above figures:

1. stainless steel ball 2, thimble 3, spring

4. Cover plate 5, button cell holder 6 and flash buzzer

7. Button cell 8, vortex disk 9, permanent magnetism dish

10. Anti-disc-wiping alarm device 20, driving disc 30 and driven disc

100. Anti-scrub pad assembly 101, anti-scrub pad front end component 102, pressure relief component

103. Plugging device 112, stepped columnar thimble 122 and spring

113. Cover plate 200, alarm assembly 201 and alarm

202. Battery pack 203 and battery

Detailed Description

The technical solutions in the embodiments of the present invention will be fully described in detail below with reference to the accompanying drawings. It is obvious that the described embodiments are only some specific embodiments, not all embodiments, of the general technical solution of the present invention. All other embodiments, which can be derived by a person skilled in the art from the general idea of the invention, fall within the scope of protection of the invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

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; 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 in specific cases to those skilled in the art.

Please refer to fig. 1 to 4. Fig. 1 is a schematic cross-sectional view of an anti-scrub alarm device according to an embodiment of the present invention. Fig. 2 is a perspective view of an embodiment of the invention. Fig. 3 is a perspective view of another view angle according to an embodiment of the present invention. Fig. 4 is a schematic view of the movement direction of the anti-scratch disc alarm device.

As shown in fig. 1 to 3, a scuff plate preventing alarm device 10 according to an embodiment of the present invention includes: at least one anti-scrub assembly 100 and at least one warning assembly 200; wherein, the anti-friction disc assembly 100 is arranged on the magnetic transmission device with the driving disc 20 and the driven disc 30, and is arranged on the driving disc 20 or the driven disc 30 and is positioned at one side of the driving disc 20 opposite to the driven disc 30; when the driving disk 20 and the driven disk 30 are displaced axially and oppositely, and the clearance between the driving disk 20 and the driven disk 30 is smaller than the preset clearance D2, the friction resistance and the axial pressure between the driving disk 20 and the driven disk 30 are eliminated by the anti-friction disk assembly;

as shown in fig. 1, the scuff plate assembly 100 includes: a front end part 101 of the anti-friction disc, a pressure relief part 102 and a plugging device 103;

the anti-scratch disk front end component 101 is arranged in a through hole in the vortex disk 8 of the driving disk 20 and movably protrudes out of the surface of the driving disk 20, the pressure relief component 102 is arranged in the through hole, and the front end of the pressure relief component 102 contacts the anti-scratch disk front end component 101 and blocks the anti-scratch disk front end component 101 in the through hole. In the embodiment of the present invention, the anti-friction front-end component 101 is a sphere, and the sphere is rotatably disposed in the through hole. The diameter of the through hole of the driving disk 20 at the outlet of the driving disk 20 on the side opposite to the driven disk 30 is smaller than that of the sphere. The pressure relief component 102 includes a stepped cylindrical thimble 112 and a spring 122, the spring 122 is disposed around the outside of the thimble 112, and one end of the spring 122 is pressed against the step of the thimble 112. The blocking device 103 is a cover plate fixedly disposed on the through hole of the driving disk 20 and located outside the opposite side of the driving disk 20 and the driven disk 30, and the other end of the spring 122 is pressed against the cover plate 113.

As shown in fig. 1, the alarm assembly 200 is installed corresponding to the anti-friction disc assembly 100, and when the driving disc 20 and the driven disc 30 are displaced axially toward each other, the clearance between the driving disc 20 and the driven disc 30 is less than or equal to the safety clearance D3, and the corresponding alarm assembly 200 is triggered to alarm.

Wherein, the alarm assembly 200 comprises an alarm 201, when the clearance between the driving disk 20 and the driven disk 30 is smaller than the safety clearance D3, the anti-friction front-end component 101 is pressed by the driving disk 20 and the driven disk 30 to generate an axial pressure, and the pressure relief component 102 is pushed to trigger the alarm 201 to give an alarm.

The alarm assembly 200 further includes a battery assembly 202, the battery assembly 202 being connected to the alarm 201, the battery assembly 202 engaging the battery 203 for alarming by the alarm 201 when the pressure relief member 102 is axially displaced beyond the safety clearance D3.

As shown in fig. 1, the anti-friction front part 101 is mounted on the vortex disk 8 of the active disk 20 and is provided with a convex vortex disk surface D2 of 2mm, which can rotate freely. When the coupler operates, the vortex disc 8 and the permanent magnetic disc 9 on the driven disc 30 rotate in the same direction, the vortex disc 8 rotates at a high speed, the permanent magnetic disc 9 rotates at a low speed, when the two discs move axially and the distance D2 is not more than 2mm, the ball body of the anti-friction front end part 101 contacts with the permanent magnetic disc 9, and the ball body of the anti-friction front end part 101 rubs with the permanent magnetic disc 9 under the influence of the rotation speed difference of the two discs, so that the permanent magnetic disc 9 is prevented from being worn. Meanwhile, the ball of the anti-friction front-end component 101 transmits the axial pressure from the permanent magnet disk 9 to the ejector pin 112, and the spring 122 surrounding the ejector pin 112 counteracts the axial force, so as to achieve the purpose of preventing the permanent magnet disk 8 and the vortex disk 9 from approaching.

When the distance between the permanent magnetic disk 9 and the vortex disk 8 is further reduced, the ball body is pressed and continues to move towards the battery 203 along the axial direction, and meanwhile, the thimble 112 is pushed to move towards the battery 203. When the thimble 112 moves to the battery 203 to a certain distance D3 which is not more than 1mm, the positive metal elastic sheet on the battery assembly 202 is pressed on the positive electrode of the button battery 203, the alarm 201 is powered on, and the alarm starts.

As shown in fig. 4, the rotational motion of the two disks is expanded along the axial direction, the rotational speed V1 of the vortex disk 8 is greater than the rotational speed V2 of the permanent magnetic disk 9, and the sphere rotates counterclockwise under the action of the rotational speed difference between the two disks and the friction force of the permanent magnetic disk 9.

In the embodiment, the anti-friction front-end component 101 is a sphere, but the arrangement of the sphere is not intended to limit the invention. In other embodiments, it need not be a sphere. In the present embodiment, the thimble 112 is a stepped column, but the present invention is not limited thereto, and in other embodiments, the thimble need not be stepped.

In the present embodiment, the spring 122 and the thimble 112 are provided as a pressure relief member, but the invention is not limited thereto. In other embodiments, other means for pressure relief may be used.

Please refer to fig. 5 to 7. Fig. 5 is a schematic side cross-sectional view of a disc permanent magnet eddy current coupling of the present invention. Fig. 6 is a side perspective view of the disc permanent magnet eddy current coupling of the present invention. Fig. 7 is a perspective view of fig. 6 from another perspective.

As shown in fig. 1 and 5, a disc-type permanent magnet eddy current coupling according to an embodiment of the present invention includes: the driving disk 20 and the driven disk 30, and the driving disk 20 and the driven disk 30 have a preset gap D1 therebetween, and the anti-friction disk warning device 10 is further provided on the driving disk 20 or the driven disk 30.

As shown in fig. 5, the disc-type permanent magnet eddy current coupling 300 is mainly composed of two parts: one part is a driving disc 20 connected with the side of the motor and consists of components such as an annular vortex disc and the like; the other part is a driven disc 30 connected to the load side and composed of a high-strength permanent magnet. The two driving discs are fixed through bolts, a disc-shaped cavity is formed in the middle of the driving discs, and the driven discs are arranged in the disc-shaped cavity;

meanwhile, the driving disc 20 and the driven disc 30 are of a split structure and are respectively fixed on the motor shaft 40 and the load shaft 50, the driving disc 20 and the driven disc 30 are in non-contact, a gap D1 is formed between the driving disc 20 and the driven disc 30, the gap is generally called as an air gap in the industry, the gap is generally set to be D1-3-4 mm, and the effect of adjusting torque transmission is achieved by adjusting the gap between the two discs.

As shown in fig. 6 and 7, in consideration of the dynamic balance problem of the rotating products, at least 4 (2 left vortex disks and 2 right vortex disks) anti-scratch disk alarm devices 10 are required to be arranged and uniformly distributed on the same circumference. As shown in fig. 6, 8 anti-scrub disc alarm devices 10 are uniformly distributed on the driving disc 8, 4 left vortex discs and 4 right vortex discs, and the anti-scrub disc alarm devices 10 are uniformly distributed on the same circumference, so that the balance requirement of a product can be met, the reliability of the product can be improved, and the problem of scrubbing of the permanent magnetic disc and the vortex disc is effectively solved.

When the driving disk 20 rotates, the vortex disk on the driving disk 20 rotates relatively to the permanent magnet on the driven disk 30, the vortex disk cuts magnetic lines of force to generate an induction magnetic field, the magnetic field interacts with the permanent magnet on the driven disk to drive the driven disk to rotate along with the driving disk, and then the load is driven to rotate. The output torque is controlled by adjusting the clearance between the driving disc and the driven disc, so that the load rotating speed is adjusted and controlled.

In the present embodiment, 8 anti-scrub alarm devices 10 are provided, but the present invention is not limited thereto. In other embodiments, other numbers of scrub protection alarm devices 10 may be provided.

Referring to fig. 8 and 9, it can be seen that the embodiment of the present invention mainly includes: the device comprises a stainless steel ball 1, a thimble 2, a spring 3, a cover plate 4, a button cell seat 5, a flash buzzer 6 and a button cell 7.

As shown in fig. 8, a stepped hole is processed in advance on the vortex disk 8 on the driving disk 20, and the small end of the hole is arc-shaped and is in contact fit with the surface of the stainless steel ball 1 to prevent the stainless steel ball 1 from falling out. 4M 3 threaded holes are uniformly processed around the holes and used for fixing the cover plate 4 and the flash buzzer 6. The stainless steel ball 1 is contacted with the arc surface in the counter bore, the other end is contacted with the thimble 2, under the action of the spring 3, the axial thrust from the permanent magnetic disk 9 is counteracted through the thimble 2. One end of the thimble 2 is contacted with the stainless steel ball, the other end is contacted with the positive pole metal shrapnel on the button cell seat 5, a spring 3 is arranged on the thimble, and under the action of the spring 3, the thimble provides thrust for the stainless steel ball 1 to offset the axial force from the permanent magnetic disk 9. When the stainless steel ball moves backwards under the thrust action of the permanent magnetic disc, the thimble is pushed by the stainless steel ball to move backwards, and then the thimble pushes the metal elastic sheet on the button battery seat to approach the anode of the button battery. One end is pressed on the small section of the thimble 2, and the other end is pressed on the cover plate 4. In order to prevent the influence of magnetic force, the stainless steel ball 1, the spring 3 and the cover plate 4 are all made of 304 stainless steel materials, the thimble 2 is made of glass fiber reinforced plastics in order to prevent magnetism and electricity, and the shell of the button cell holder 5 and the flash buzzer 6 is made of plastics.

The cover plate 4 is in a shape of a circular sheet, 4 phi 3.2 holes are uniformly distributed on the cover plate, and the hole distance is the same as that of 4M 3 threaded holes on the vortex disc 8. After the stainless steel ball 1, the thimble 2 and the spring 3 are sequentially loaded into the counter bore, the cover plate 4 is screwed to the vortex plate 8 by 2M 3X 22 screws. One side of the cover plate 4 is provided with a small boss, the size of the small boss is the same as that of the counter bore of the vortex disc 8, when the cover plate 4 is installed, the direction needs to be noticed, one side of the small boss is installed in the counter bore, on one hand, the small boss is used for compressing the spring 3, on the other hand, the central axis of the cover plate 4 is restrained to be coincident with the central axis of the counter bore, and the limiting effect is achieved. The cover plate 4 is also provided with a groove with the same shape as the button cell holder 5 for installing the button cell holder 5, and the groove can accommodate the whole button cell holder 5.

The button cell seat 5 is used for installing and fixing the button cell, is made of plastic, and is provided with two metal elastic sheets, one metal elastic sheet is positioned in the cell seat, and the other metal elastic sheet is positioned outside the cell seat and is respectively used for connecting the negative electrode and the positive electrode of the button cell 7. When the button battery 7 is arranged in the button battery seat 5, the negative pole of the battery is connected with the metal elastic sheet in the battery seat, the positive pole of the battery is not connected with the metal elastic sheet outside the battery seat, and a gap of 1mm is arranged between the positive pole of the battery and the metal elastic sheet. On the back of the button cell holder 5, two metal shrapnels respectively extend to form a small section for connecting with the positive and negative electrode circuits of the flash buzzer 6. Thus, the flashing buzzer 6 and the button cell 7 form a loop. Under normal operating mode, because button cell 7 anodal and the outer metal shrapnel of battery holder do not connect, have 1mm clearance, consequently under normal operating mode, flash of light bee calling organ 6 does not switch on, does not report to the police yet. Only the metal elastic sheet is pushed by the thimble for 1mm, until the positive pole of the button cell is connected, the flash buzzer 6 is electrified, and then an alarm is given.

Two flash buzzers 6 are processed

Holes, pitch and cover plate 4

The holes are the same, two M3X 22 screws can be used for sequentially penetrating the flash buzzer 7 and the cover plate 4, and the flash buzzer and the cover plate are screwed on the vortex disc togetherAnd 8, above. Two circuits extend out of the flash buzzer 6, one circuit is connected to the positive metal elastic piece on the button cell seat 5, and the other circuit is connected to the negative metal elastic piece on the button cell seat 5. Forming a loop with the button cell 7. Because the field noise of the coupler is generally high, the buzzer 6 with the flash light is used, and even if a person cannot hear the sound of the buzzer, the person can see the flash light, so that the attention of the person is attracted.

The invention also provides a disc-wiping prevention alarm method for the disc type permanent magnet eddy current coupling, which comprises the following steps:

(1) when the driving disk 20 and the driven disk 30 are displaced axially and oppositely, and the clearance between the driving disk 20 and the driven disk 30 is smaller than the preset clearance, the friction resistance between the driving disk 20 and the driven disk 30 is eliminated through the anti-friction disk assembly 100;

(2) axial pressure from the driven disk 30 is transmitted to the anti-friction disk assembly 100 and is counteracted by the anti-friction disk assembly 100, thereby preventing the driving disk 20 and the driven disk 30 from approaching;

(3) when the distance between the driving disk 20 and the driven disk 30 is further reduced to be less than the safety clearance, the anti-friction disk assembly 100 triggers the alarm assembly 200 to alarm.

The whole moving process of the stainless steel ball 1 can be divided into two stages, the first stage is that when the distance between the two discs is 1< x and is less than or equal to 2mm, at the moment, the flash buzzer 6 does not give an alarm, and the stainless steel ball 1 gives a counterforce to the permanent magnetic disc 9 under the action of the thimble 2 and the spring 3 to prevent the two discs from approaching. And in the second stage, when the distance x between the two disks is less than or equal to 1mm, the thimble 2 pushes the metal elastic sheet on the button cell seat 5 to be connected with the anode of the button cell 7, the flash buzzer 6 is electrified, and the flash buzzer 6 starts to give an alarm. Meanwhile, the stainless steel ball 1 continues to provide a counterforce to the permanent magnetic disk 9 under the action of the thimble 2 and the spring 3, so that the two disks are prevented from approaching.

In summary, the present invention can eliminate the friction force generated by the contact between the driving disk 20 and the driven disk 30 when the driving disk 20 and the driven disk 30 are axially displaced and the clearance between the driving disk 20 and the driven disk 30 is smaller than the predetermined clearance, and can prevent the driving disk 20 and the driven disk 30 from approaching to some extent; furthermore, the invention can also realize that when the clearance between the driving disc 20 and the driven disc 30 is smaller than the safety clearance, the alarm is given by sound and light, and the attention of workers can be effectively reminded in time so as to avoid disc-wiping accidents; the disc-wiping hidden danger of the disc-type permanent magnet eddy-current coupling in practical use is effectively solved, the occurrence of safety accidents is reduced, and a large amount of equipment maintenance cost is saved for enterprises.

The above description is for the purpose of describing particular embodiments of the present invention, and is not intended to limit the scope of the present invention, which is defined by the claims and their equivalents, and all changes and modifications that can be made therein without departing from the spirit and scope of the present invention. It is noted that in the drawings and in the description, implementations not shown or described are all in a form known to those of ordinary skill in the art and are not described in detail. Furthermore, the above definitions of the various components and processes are not intended to be limited to the specific structures, shapes, or configurations shown in the examples.

Claims (8)

1. An anti-friction disc alarm device is arranged on a magnetic transmission device with a driving disc and a driven disc, and is characterized by comprising:

the anti-friction disc assembly is arranged on the driving disc or the driven disc and is positioned on one side, opposite to the driven disc, of the driving disc, when the driving disc and the driven disc are displaced in the axial direction in the opposite direction, the clearance between the driving disc and the driven disc is smaller than or equal to a preset clearance D2, and the anti-friction disc assembly eliminates the friction resistance between the driving disc and the driven disc and counteracts the axial pressure between the driving disc and the driven disc;

the alarm assembly is arranged corresponding to the anti-friction disc assembly, when the driving disc and the driven disc generate axial opposite displacement, the gap between the driving disc and the driven disc is further reduced to be less than or equal to a safety gap D3, and the corresponding alarm assembly is triggered to alarm;

the scuff plate assembly includes: the alarm assembly comprises an alarm, and the pressure relief component triggers the alarm to give an alarm;

the front end part of the anti-wiping disk is arranged in a through hole in the driving disk and movably protrudes out of the surface of the driving disk, the pressure relief part is arranged in the through hole, and the front end of the pressure relief part contacts the front end part of the anti-wiping disk and blocks the front end part of the anti-wiping disk in the through hole.

2. The anti-scratch disc alarm device of claim 1, wherein the front end member of the anti-scratch disc is a sphere rotatably disposed in the through hole.

3. The alarm of claim 1, wherein the pressure relief member comprises a stepped cylindrical thimble and a spring, the spring is disposed around the outside of the thimble, and one end of the spring is pressed against the stepped thimble.

4. The device of claim 3, further comprising a blocking device, wherein the blocking device is a cover plate fixedly disposed on the through hole of the driving disc and located on the outer side of the driving disc opposite to the driven disc, and the other end of the spring is pressed against the cover plate.

5. The scuff plate alarm device of claim 2, wherein the through hole in the driving plate has a diameter at the outlet on the opposite side of the driving plate from the driven plate that is less than the diameter of the sphere.

6. The scuff plate alarm device of claim 1, wherein the alarm assembly further includes a battery assembly, the battery assembly being connected to the alarm, the battery assembly being connected to a power source for the alarm to alarm when the pressure relief member is axially moved beyond the safety gap D3.

7. A disc permanent magnet eddy current coupling, comprising: the anti-friction disc alarm device comprises a driving disc and a driven disc, a preset gap D1 is reserved between the driving disc and the driven disc, and the anti-friction disc alarm device is further arranged on the driving disc or the driven disc according to any one of claims 1-6.

8. A disc-wiping prevention alarm method for a disc type permanent magnet eddy current coupling comprises the following steps: the anti-friction disc alarming device is characterized by comprising a driving disc and a driven disc, a preset gap D1 is reserved between the driving disc and the driven disc, the driving disc or the driven disc is further provided with the anti-friction disc alarming device as claimed in any one of claims 1-6, and the anti-friction disc alarming method comprises the following steps:

(1) when the driving disc and the driven disc are displaced in the axial direction, the clearance between the driving disc and the driven disc is smaller than or equal to the preset clearance D2, and the friction resistance between the driving disc and the driven disc is eliminated through the anti-friction disc assembly;

(2) axial pressure from the driven disc is transmitted to the anti-friction disc assembly, and the anti-friction disc assembly counteracts the axial pressure, so that the driving disc and the driven disc are prevented from approaching;

(3) when the distance between the driving disc and the driven disc is further reduced to be smaller than a safety clearance D3, the anti-friction disc assembly triggers the alarm assembly to give an alarm.

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