CN214247991U

CN214247991U - Electromagnetic joint and supporting arm

Info

Publication number: CN214247991U
Application number: CN202022318252.2U
Authority: CN
Inventors: 秦蓁; 张勇; 魏玉彪
Original assignee: Tinavi Medical Technologies Co Ltd
Current assignee: Tinavi Medical Technologies Co Ltd; Beijing Tinavi Medical Technology Co Ltd
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2021-09-21
Anticipated expiration: 2030-10-16

Abstract

The application provides an electromagnetic joint and a support arm. The electromagnetic joint includes: the inner part of the shell is a cavity with one open end; the electromagnetic brake comprises a magnet and an armature, the magnet comprises a mounting hole, the armature comprises a first through hole corresponding to the mounting hole, and the electromagnetic brake is arranged in the cavity of the shell; the shaft comprises a first end and a second end which are opposite, a boss extends out of the outer wall of the shaft along the radial direction, the first end of the shaft passes through the first through hole and is rotatably arranged in the mounting hole, the armature is connected with the boss, the armature can slide along the axis of the shaft, the magnet attracts the armature, and the armature limits the rotation of the shaft; the speed reducer is arranged at the opening end of the shell, and the boss of the shaft is connected with the speed reducer. The electromagnetic joint is simple to operate, high in load capacity and good in sealing performance, and meets the requirement for high-temperature sterilization.

Description

Electromagnetic joint and supporting arm

Technical Field

The application relates to the field of medical equipment, in particular to an electromagnetic joint and a supporting arm.

Background

At present, the articulation of the two rod-shaped parts is usually achieved by means of a hinge or a universal joint and is locked by means of a screw pair. The existing hinge joint form has small bearing capacity, and needs to realize locking through manually rotating the thread pair, so that the operation is complicated.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, the present application provides an electromagnetic joint and a support arm.

One embodiment of the present application provides an electromagnetic joint, comprising: the inner part of the shell is a cavity with one open end; the electromagnetic brake comprises a magnet and an armature, the magnet comprises a mounting hole, the armature comprises a first through hole corresponding to the mounting hole, and the electromagnetic brake is arranged in the cavity of the shell; the shaft comprises a first end and a second end which are opposite, a boss extends out of the outer wall of the shaft along the radial direction, the first end of the shaft passes through the first through hole and is rotatably arranged in the mounting hole, the armature is connected with the boss, the armature can slide along the axis of the shaft, the magnet attracts the armature, and the armature limits the rotation of the shaft; the speed reducer is arranged at the opening end of the shell, and the boss of the shaft is connected with the speed reducer.

According to some embodiments of the application, the first end of the shaft is disposed in the mounting hole of the electromagnetic brake through a first bearing.

According to some embodiments of the present application, the second end of the shaft is disposed in the shaft bore of the reducer through a second bearing.

According to some embodiments of the application, the armature is provided with a limiting hole, and a screw penetrates through the limiting hole to be connected with the boss.

According to some embodiments of the present application, the electromagnetic joint further comprises a first contact disposed on the housing, the first contact being connected to the electromagnetic brake.

According to some embodiments of the present application, the electromagnetic joint further comprises a second contact disposed on the speed reducer, the second contact being connected to the first contact.

According to some embodiments of the present application, a first seal ring is disposed between the speed reducer and the housing.

According to some embodiments of the present application, a second seal ring is provided outboard of the output bearing of the reducer.

One embodiment of the present application provides a support arm comprising: a plurality of arm levers; the number of the electromagnetic joints is multiple, the arm rods are sequentially connected in series, and the connected arm rods are hinged through the electromagnetic joints; and the control switch is electrically connected with the electromagnetic joint.

According to some embodiments of the application, the control switch is electrically connected in series with a plurality of the electromagnetic joints.

According to the electromagnetic joint, the armature of the electromagnetic brake is connected with the shaft, the magnet adsorbs the armature, and the force between the magnet and the armature limits the armature to rotate, so that the rotation of the shaft is limited, and the locking of the shaft is realized; the magnet does not adsorb the armature, and the shaft is unlocked and can rotate. The speed reducer is used for amplifying the braking torque of the electromagnetic brake and improving the load capacity of the electromagnetic joint.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without exceeding the protection scope of the present application.

FIG. 1 is a schematic view of an electromagnetic joint according to an embodiment of the present application;

FIG. 2 is a cross-sectional view of an electromagnetic joint according to an embodiment of the present application;

FIG. 3 is an exploded view of an electromagnetic joint according to an embodiment of the present application;

FIG. 4 is a schematic view of a housing of an embodiment of the present application;

FIG. 5 is a cross-sectional view of a housing of an embodiment of the present application;

FIG. 6 is a first schematic view of an electromagnetic brake according to an embodiment of the present application;

FIG. 7 is a second schematic view of an electromagnetic brake according to an embodiment of the present application;

FIG. 8 is a schematic view of a shaft of an embodiment of the present application;

FIG. 9 is a schematic view of a support arm according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. 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 application.

Example 1

As shown in fig. 1, 2 and 3, the present embodiment provides an electromagnetic joint 100. The electromagnetic joint 100 includes: a housing 1, an electromagnetic brake 2, a shaft 3 and a reducer 4. The electromagnetic brake 2 is disposed in the housing 1, and the electromagnetic brake 2 can restrict rotation of the shaft 3 to brake the electromagnetic joint 100.

As shown in fig. 4 and 5, the inside of the housing 1 is a cavity 11 with an open top. In this embodiment, a flange extends from the top end of the housing 1 along the radial direction, and a plurality of threaded holes 13 are uniformly distributed on the flange along the circumferential direction. Optionally, the housing 1 is made of a high temperature resistant material.

As shown in fig. 6 and 7, the electromagnetic brake 2 is a conventional device. The electromagnetic brake 2 includes a magnet 21 and an armature 22, and the magnet 21 includes a permanent magnet and an electromagnet. When the electromagnet is not energized, no magnetic field is generated, and the attraction of the permanent magnet attracts the armature 22 to the surface of the magnet 21. When the electromagnet is electrified, the magnetic field of the electromagnet and the magnetic field of the permanent magnet are counteracted, the attraction force of the magnet 21 disappears, and the armature 22 is separated from the surface of the magnet 21 under the action of the elastic piece. The magnet 21 includes a mounting hole 211 extending along the axis of the electromagnetic brake 2. The armature 22 includes a first through hole 221 corresponding to the mounting hole 211. The electromagnetic brake 2 is disposed in the cavity 11 of the housing 1 with the magnet 21 below the armature 22.

As shown in fig. 8, the shaft 3 includes opposite first and

second ends

31 and 32. The outer wall of the shaft 3 extends a boss 33 along the radial direction of the shaft 3, and the boss 33 is disc-shaped. The first end 31 of the shaft 3 is rotatably disposed in the mounting hole 211 through the first through hole 221 of the armature such that the armature 22 is fitted over the shaft 3. The armature 22 is connected with the boss 33, and the armature 22 can slide for a certain distance along the axis of the shaft 3, so that the requirement that the armature 22 is adsorbed by the magnet 21 and separated from the magnet 21 is met. The connection of the armature 22 to the boss 33 is such that the armature 22 and the shaft 3 cannot rotate relative to each other. When the electromagnet is not electrified, and the magnet 21 attracts the armature 22, the armature 22 is adsorbed on the surface of the magnet 21 and cannot move, and the boss 33 is connected with the armature 22, so that the armature 22 limits the rotation of the shaft 3, and the locking of the shaft 3 is realized. The electromagnet is energized, the armature 22 is disengaged from the surface of the magnet 21, and the shaft 3 is unlocked and rotatable.

The speed reducer 4 is provided at the opening end of the housing 1. In this embodiment, the screw 41 passes through the connection hole on the speed reducer 4 to be connected with the threaded hole 13 of the housing 1, so as to fixedly connect the speed reducer 4 and the housing 1. The boss 33 of the shaft is connected to the input portion of the speed reducer 4, and the second end 32 of the shaft penetrates into the shaft hole of the speed reducer 4. Alternatively, in this embodiment, a counterbore 35 is provided in the boss 33, and a screw 36 is passed through the counterbore 35 to connect the input portion of the speed reducer 4.

The decelerator 4 amplifies the braking torque of the electromagnetic brake 2 to reduce the volume of the electromagnetic brake used. Optionally, the reducer 4 is of the planetary, harmonic, RV or nutating type. The speed ratio of the harmonic reducer selected in the embodiment is 160.

The electromagnetic joint 100 realizes locking or unlocking of the electromagnetic joint through rotation of the electromagnetic brake control shaft, and an operator can realize control over the electromagnetic joint only by controlling the electromagnetic brake to be powered on through the control switch. The brake torque of the electromagnetic brake is amplified through the speed reducer, and the bearing capacity of the electromagnetic joint is improved.

According to an alternative solution of this embodiment, the first end 31 of the shaft is arranged in the mounting hole 211 of the electromagnetic brake via the first bearing 5. Providing the first bearing 5 between the first end 31 of the shaft and the mounting hole 211 reduces the frictional resistance to rotation of the shaft 3.

Optionally, the second end 32 of the shaft is disposed in the shaft bore of the reducer 4 via the second bearing 6. The second bearing 6 supports the second end 32 of the shaft.

According to an optional technical scheme of the embodiment, the armature 22 is provided with a limiting hole 222, the boss 33 of the shaft is provided with a threaded hole 34 corresponding to the limiting hole 222, and the screw 223 penetrates through the limiting hole 222 to be connected with the threaded hole 34 on the boss 33. The screw 223 does not fix the armature 22 to the boss 33 and the armature 22 is slidable a suitable distance along the axis of the shaft 3. When the armature 22 is attracted to the magnet 21, the armature 22 transmits a restricting force to the boss 33 via the screw 223 to restrict the rotation of the shaft 3.

In an alternative solution, the electromagnetic joint 100 further includes a first contact 7, and the first contact 7 is disposed on the housing 1. In the present embodiment, a contact hole 12 is provided at the bottom end of the housing 1, and the first contact 7 is provided in the contact hole 12. The first contact 7 is connected to the electromagnetic brake 2 and serves as an electrode for connecting the electromagnetic brake 2 to an external power supply. The first contact 7 may be a spring contact.

Further, the electromagnetic joint 100 further includes a second contact 8, and the second contact 8 is disposed on the speed reducer 4. In the present embodiment, the second contact is provided at the center of the tip end of the speed reducer 4. The second contact 8 is connected to the first contact 7 by a wire, and the connecting wire of the second contact 8 and the first contact 7 may extend inside the electromagnetic joint 100. The second contact of one electromagnetic joint can be connected with the first contact of another electromagnetic joint, so that the plurality of electromagnetic joints are connected in series. The second contact 8 may be a spring contact.

In an optional scheme, the selected speed reducer 4 has good waterproof performance, and a first sealing ring 15 is arranged between the speed reducer 4 and the shell 1. In this embodiment, a seal groove 14 is provided at the top end of the housing 1, and a first seal ring 15 is provided in the seal groove 14. The first sealing ring 15 improves the sealing performance of the electromagnetic joint 100, and the electromagnetic joint 100 is waterproof.

Optionally, if the waterproof performance of the speed reducer 4 is poor, the second sealing ring 42 is disposed outside the output bearing of the speed reducer 4, so as to further improve the waterproof performance of the electromagnetic joint 100. In this embodiment, the electromagnetic joint 100 forms a sealed whole, has good waterproof performance, and is convenient for performing high-temperature sterilization on the electromagnetic joint 100 before an operation.

Example 2

As shown in fig. 9, the present embodiment provides a support arm that: a plurality of arm links 200 and a plurality of electromagnetic joints 100. The plurality of arm levers 200 are connected in series in sequence, and the connected arm levers 200 are hinged through the electromagnetic joint 100. The control switch is electrically connected with the electromagnetic joint 100, and the control switch controls the locking and unlocking of the electromagnetic joint 100. When the electromagnetic joint 100 is unlocked, the positions of the other arm levers 200 except the first arm lever can be adjusted, and after the electromagnetic joint 100 is locked, the positions of the arm levers 200 are fixed. The support arm may be used for support of an object.

In an alternative, the control switch is electrically connected in series with the plurality of electromagnetic joints 100. The locking or unlocking of the plurality of electromagnetic joints 100 is controlled simultaneously by one control switch. In another scheme, each electromagnetic joint 100 corresponds to a control switch, so as to realize respective control of each electromagnetic joint 100.

The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the description of the embodiments is only intended to facilitate the understanding of the methods and their core concepts of the present application. Meanwhile, a person skilled in the art should, according to the idea of the present application, change or modify the embodiments and applications of the present application based on the scope of the present application. In view of the above, the description should not be taken as limiting the application.

Claims

1. An electromagnetic joint, comprising:

the inner part of the shell is a cavity with one open end;

the electromagnetic brake comprises a magnet and an armature, the magnet comprises a mounting hole, the armature comprises a first through hole corresponding to the mounting hole, and the electromagnetic brake is arranged in the cavity of the shell;

the shaft comprises a first end and a second end which are opposite, a boss extends out of the outer wall of the shaft along the radial direction, the first end of the shaft passes through the first through hole and is rotatably arranged in the mounting hole, the armature is connected with the boss, the armature can slide along the axis of the shaft, the magnet attracts the armature, and the armature limits the rotation of the shaft;

the speed reducer is arranged at the opening end of the shell, and the boss of the shaft is connected with the speed reducer.

2. The electromagnetic joint according to claim 1, wherein the first end of the shaft is disposed in the mounting hole of the electromagnetic brake by a first bearing.

3. The electromagnetic joint according to claim 2, wherein the second end of the shaft is disposed in the shaft bore of the reducer through a second bearing.

4. The electromagnetic joint according to claim 1, wherein the armature is provided with a limiting hole, and a screw passes through the limiting hole to be connected with the boss.

5. The electromagnetic joint according to claim 1, further comprising a first contact disposed on said housing, said first contact being connected to said electromagnetic brake.

6. The electromagnetic joint according to claim 5, further comprising a second contact disposed on said reducer, said second contact being connected to said first contact.

7. The electromagnetic joint according to claim 1, characterized in that a first sealing ring is provided between the reducer and the housing.

8. The electromagnetic joint according to claim 7, characterized in that a second sealing ring is provided outside the output bearing of the reducer.

9. A support arm, comprising:

a plurality of arm levers;

the electromagnetic joint of any one of claims 1 to 8, wherein the number of the electromagnetic joints is multiple, a plurality of the arm rods are connected in series in sequence, and the connected arm rods are hinged through the electromagnetic joint;

and the control switch is electrically connected with the electromagnetic joint.

10. A support arm according to claim 9, wherein the control switch is electrically connected in series with a plurality of the electromagnetic joints.