Magnetic torsion limiter

Abstract

The utility model belongs to the field of torsion limiters, and particularly relates to a magnetic torsion limiter. The utility model provides a magnetic torsion limiter. The magnetic torsion limiter comprises a motor, a speed reducer, a rotating shaft, a driving turntable, a driven turntable, a bearing and a magnet, the output end of the motor is connected with the input end of the reducer; one end of the rotating shaft is connected with the output end; the center position of the driving turntable sleeves and is fixed at the other end of the rotating shaft; a bearing is arranged in the center of the driven turntable and sleeves the middle part of the rotating shaft; a plurality of first grooves are formed in the surface, facing the driven turntable, of the driving turntable, and a plurality of second grooves corresponding to the first grooves are formed in the surface, facing the driving turntable, of the driven turntable; and the magnet is arranged in the first groove and the second groove. The driving rotary disc drives the driven rotary disc to rotate through magnetic force, when the driven rotary disc is subjected to driving force with the torque larger than the magnetic force, the driven rotary disc is not subjected to the magnetic force, and the situation that the device is damaged due to overload can be effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of torsion limiter, specifically relates to a magnetic torsion limiter. BACKGROUND

[0002] If the traditional motor encounters some sudden situation when outputting rotation, the load is suddenly increased, which can cause motor failure or shaft fracture, and can seriously threaten the life safety of the operator. There is no good way to solve this problem at present. INVENTION CONTENTS

[0003] The magnetic torsion limiter can effectively solve the problems in the background art.

[0004] The utility model provides a kind of magnetic torsion limiter, including motor, speed reducer, shaft, driving turntable, driven turntable, bearing and magnet;

[0005] The output end of the motor is connected to the input end of the speed reducer;One end of the shaft is connected to the output end of the speed reducer;The center position of the driving turntable is sleeved and fixed on the other end of the shaft;The center position of the driven turntable is provided with a bearing, and the bearing is sleeved on the middle part of the shaft;

[0006] The surface of the driving turntable facing the driven turntable is provided with a plurality of first grooves, and the surface of the driven turntable facing the driving turntable is provided with a plurality of second grooves corresponding to the first grooves;The magnet is arranged in the first groove and the second groove.

[0007] As a further optimization of the utility model, the magnet on the first groove is placed with north-south poles staggered towards the surface of the driven turntable;The magnet on the second groove is placed with north-south poles staggered towards the surface of the driving turntable.

[0008] As a further optimization of the utility model, a conical counterbore is provided on the magnet, and a groove threaded hole is provided at the bottom of the first groove and the second groove, and a conical countersunk bolt is threadedly connected with the groove threaded hole after passing through the conical counterbore to fix the magnet.

[0009] As a further optimization of the utility model, it further includes a cover plate;The other end of the shaft is provided with a cutout on the side wall;The middle part of the cover plate is provided with a first through hole corresponding in shape to the cutout portion, and the cover plate is sleeved in the cutout and fixed on the shaft by bolts.

[0010] As a further optimization of the utility model, a threaded hole is further provided on the driven turntable;The bolt is threadedly connected with the threaded hole.

[0011] As a further optimization of the utility model, a ladder is provided on the middle part of the shaft;One side of the bearing is close to the ladder surface, and the other side of the bearing is limited in the axial direction by a snap spring.

[0012] The magnetic torque limiter provided by the utility model can effectively avoid the damage of the device caused by overload. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is the structural schematic diagram of the embodiment;

[0014] Figure 2 is Figure 1 side view;

[0015] Figure 3 is Figure 1 is the structural schematic diagram of the driving disc in the middle;

[0016] Figure 4 is Figure 1 is the structural schematic diagram of the rotating shaft in the middle;

[0017] Figure 5 is Figure 1 is the structural schematic diagram of the cover plate in the middle;

[0018] Among them, motor 1, speed reducer 2, rotating shaft 3, step 3a, cutout 3a, driving disc 4, first recess 4a, threaded through hole 4b, driven disc 5, magnet 7, cover plate 8, first through hole 8a, second through hole 8b. DETAILED DESCRIPTION

[0019] As Figures 1-5 shown, the embodiment includes motor 1, speed reducer 2, rotating shaft 3, driving disc 4, driven disc 5, bearing and magnet 7.

[0020] The output shaft of motor 1 is connected with the input end of speed reducer 2, and one end of rotating shaft 3 is connected with the output end of speed reducer 2. Motor 1 drives speed reducer 2 to rotate, and speed reducer 2 drives rotating shaft 3 to rotate.

[0021] The center position of driving disc 4 is sleeved and fixed on the other end of rotating shaft 3. Driving disc 4 and rotating shaft 3 can be connected by a key. In the embodiment, no key connection is adopted, but cover plate 8 is arranged, and cover plate 8 is arranged on the end head of the other end of rotating shaft 3. Specifically, two cutouts 3a are arranged on the side wall of the other end of rotating shaft 3, the middle part of cover plate 8 is provided with first through hole 8a corresponding to the shape of cutout 3a, cover plate 8 is sleeved at cutout 3a and fixed by bolts, and rotating shaft 3 drives cover plate 8 to rotate.

[0022] The cover plate 8 is further provided with two second through holes 8b, and two threaded holes 4b are arranged on the driving disc 4 at positions corresponding to the second through holes 8b, and two bolts pass through the second through holes 8b on the cover plate 8 and are screwed into the threaded holes 4b of the driving disc 4 to fix the driving disc 4. The advantage of this mounting structure is that the gap between the driving disc 4 and the driven disc 5 can be adjusted.

[0023] A bearing is arranged at the center of the driven disc 5 and is sleeved on the middle part of the rotating shaft 3. In this embodiment, a step 3a is arranged on the middle part of the rotating shaft 3, one surface of the bearing is attached to the step surface, and the other surface of the bearing is limited by a circlip, so that the driven disc 5 is prevented from moving in the length direction of the rotating shaft 3.

[0024] The surface of the driving disc 4 facing the driven disc 5 is provided with a plurality of annularly arranged first grooves 4a, the surface of the driven disc 5 facing the driving disc 4 is provided with a plurality of second grooves corresponding to the first grooves 4a, and the magnets 7 are arranged in the first grooves 4a and the second grooves. The rotating shaft 3 drives the driving disc 4 to rotate, the driving disc 4 drives the driven disc 5 to rotate under the action of the magnetic force, and when the torsion force received by the driven disc 5 is greater than the magnetic force between the driving disc 4 and the driven disc 5, the driving force of the driving disc 4 on the driven disc 5 will fail, thereby preventing overload.

[0025] In this embodiment, the magnetic force between the driving disc 4 and the driven disc 5 can be adjusted by adjusting the gap between the driving disc 4 and the driven disc 5.

[0026] Further, the magnets 7 on the first grooves 4a are arranged with the north and south poles staggered towards the surface of the driven disc 5, and the magnets 7 on the second grooves are arranged with the north and south poles staggered towards the surface of the driving disc 4.

[0027] This embodiment also provides a structure for mounting the magnets 7. Specifically, the first grooves 4a and the second grooves are cylindrical counterbores with the same shape, and the small-diameter end of the cylindrical counterbores is provided with a thread. The shape of the magnet 7 corresponds to the large-diameter end of the cylindrical counterbore, the magnet 7 is provided with a tapered counterbore, the small-diameter end of the tapered counterbore is collinear with the small-diameter end of the cylindrical counterbore, the small-diameter end of the tapered counterbore has a larger diameter than the small-diameter end of the cylindrical counterbore, and a tapered counterbore screw passes through the tapered counterbore and engages with the small-diameter end of the cylindrical counterbore to fix the magnet 7 on the first grooves 4a or the second grooves.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A magnetic torque limiter, characterized by The motor, the speed reducer, the rotating shaft, the driving disc, the driven disc, the bearing and the magnet are included. The output end of the motor is connected with the input end of the speed reducer, one end of the rotating shaft is connected with the output end of the speed reducer, the center of the driving disc is sleeved and fixed on the other end of the rotating shaft, and the center of the driven disc is provided with the bearing which is sleeved on the middle part of the rotating shaft. The surface of the driving disc facing the driven disc is provided with a plurality of first grooves, the surface of the driven disc facing the driving disc is provided with a plurality of second grooves corresponding to the first grooves, and the magnet is arranged in the first grooves and the second grooves.

2. A magnetic torque limiter according to claim 1, wherein The magnet on the first grooves is arranged in the north-south pole staggered manner facing the surface of the driven disc, and the magnet on the second grooves is arranged in the north-south pole staggered manner facing the surface of the driving disc.

3. A magnetic torque limiter according to claim 1, wherein The magnet is provided with a tapered counterbore, the bottom of the first grooves and the second grooves is provided with a groove threaded hole, and the tapered countersunk bolt is screwed with the groove threaded hole after penetrating through the tapered counterbore to fix the magnet.

4. The magnetic torque limiter of claim 1, wherein, The rotating shaft is further provided with a cutout on the other end of the side wall, the middle part of the cover plate is provided with a first through hole corresponding to the shape of the cutout, the cover plate is sleeved on the cutout and is fixed on the rotating shaft through the bolt.

5. A magnetic torque limiter according to claim 4, wherein The driven disc is further provided with a threaded through hole, and the bolt is screwed with the threaded through hole through the cover plate.

6. A magnetic torque limiter according to claim 1, wherein The middle part of the rotating shaft is provided with a step, one side of the bearing is close to the step surface, and the other side of the bearing is limited in the axial direction through the snap spring.

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