CN212076272U

CN212076272U - Disc type permanent magnet brake for elevator

Info

Publication number: CN212076272U
Application number: CN201821811310.1U
Authority: CN
Inventors: 黄海洋; 张润良
Original assignee: Suzhou Vocational University
Current assignee: Suzhou Vocational University
Priority date: 2018-11-05
Filing date: 2018-11-05
Publication date: 2020-12-04
Anticipated expiration: 2028-11-05

Abstract

The utility model provides an elevator disc type permanent magnet brake, which comprises a plurality of mutually independent brake components, wherein each group of brake components comprises a first permanent magnet and an electromagnet; the second permanent magnet is fixedly connected with a tractor shaft and rotates along with the tractor shaft, and the plurality of brake assemblies are dispersedly arranged at positions close to the second permanent magnet; the electromagnets in each group of brake assemblies are arranged between the first permanent magnet and the second permanent magnet, and the disc type permanent magnet brake of the elevator adopts magnetic braking, so that various mechanical faults existing in mechanical braking can be effectively avoided.

Description

Disc type permanent magnet brake for elevator

Technical Field

The utility model relates to an elevator braking field, concretely relates to elevator dish formula permanent magnetism stopper.

Background

The elevator brake is a key component for ensuring normal and safe operation of the elevator, and when the elevator car stops operating, the brake is braked by an internal contracting brake to keep the elevator car at a flat floor or a required position.

The traditional elevator brake comprises a disc brake, a block brake and a butterfly brake, the working principle of the traditional elevator brake is basically the same, namely when an electromagnet is electrified, the brake shoe and a brake wheel are separated (brake release) by overcoming the elastic force of a spring through electromagnetic force, and when the electromagnet is not electrified, the brake shoe is attached to the brake wheel under the action of the spring to realize braking (brake contracting).

Since the above conventional elevator brake relies on a spring to push a shoe to reset the brake, there are problems including: the failure of the spring elasticity can cause insufficient or lost braking force, the abrasion of a brake shoe causes insufficient braking force, the blockage of mechanical movement affects the braking, and the like.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides an elevator dish formula permanent magnetism stopper, this elevator dish formula permanent magnetism stopper have removed mechanical parts such as spring, brake shoe, can obviously reduce the fault rate of stopper, strengthen the security of stopper.

The utility model adopts the following technical scheme:

an elevator disc type permanent magnet brake comprises a plurality of mutually independent brake assemblies, wherein each brake assembly comprises a first permanent magnet and an electromagnet;

the second permanent magnet is fixedly connected with a tractor shaft and rotates along with the tractor shaft, and the plurality of brake assemblies are dispersedly arranged at positions close to the second permanent magnet; the first permanent magnets in each set of the brake assemblies provide a first magnetic field, the second permanent magnets provide a second magnetic field, and each first magnetic field independently attracts the second magnetic field to independently provide a braking force for stopping the second permanent magnets from rotating;

each set of the brake assemblies is provided with the electromagnet which is arranged between the first permanent magnet and the second permanent magnet and selectively provides a third magnetic field, and the third magnetic field controls the influence of the first magnetic field on the second magnetic field so as to control the braking force.

Preferably, the electromagnet comprises an iron core and a coil, and there is a substantially linear correspondence between the current through the coil and the magnitude of the braking force.

Preferably, the third magnetic field selectively cooperates with the first and second magnetic fields to selectively increase the braking force.

Preferably, a magnetic circuit is included, the magnetic circuit comprising a ferromagnetic material for propagating the first, second and third magnetic fields therethrough.

Preferably, a rotor fixed to the machine shaft and extending in a radial direction with respect to the machine shaft is included, and the second permanent magnet is fixed to an outer peripheral edge side of the rotor.

Preferably, the plurality of brake assemblies each include a fixing frame, and the first permanent magnet and the electromagnet in each brake assembly are fixed to the fixing frame.

Preferably, the polarities of the first permanent magnet and the second permanent magnet are opposite, that is, the N (or S) pole of the first permanent magnet corresponds to the S (or N) pole of the second permanent magnet.

Preferably, the second permanent magnet is separated into a plurality of second permanent magnets, and the second permanent magnets are uniformly distributed on the side surface of the peripheral edge of the rotor in a surrounding manner.

Preferably, a rotor fixed to the machine shaft and extending in a radial direction with respect to the machine shaft is included, and the rotor is the second permanent magnet.

Preferably, two of the brake assemblies are included and are symmetrically disposed with respect to a plane in which the axis of rotation of the machine shaft lies.

Compared with the prior art, the beneficial effects of the utility model are that: the braking force is provided by the attraction force between the first permanent magnet and the second permanent magnet, and the permanent magnets can provide stable magnetic force, so that the problem of spring failure is avoided, and the brake shoe-like material contact is avoided, and the abrasion is avoided; only the change of a magnetic field exists in the brake releasing and contracting processes, the mechanical action in the traditional brake does not exist, the mechanical blocking fault cannot occur, and the reaction speed is higher; a plurality of groups of mutually independent brake assemblies are adopted, if one group fails, other groups can still complete braking, and safety and stability are enhanced.

Drawings

Fig. 1 is the utility model discloses elevator dish formula permanent magnet brake's overall structure sketch map.

Fig. 2 is a schematic view of a part of a sectional structure of the direction a corresponding to fig. 1.

Fig. 3 is a schematic view of a magnetic field in a contracting brake state corresponding to fig. 1.

Fig. 4 is a magnetic field diagram corresponding to fig. 1 in a released state.

Fig. 5 is a schematic structural view of a rotor and a second permanent magnet according to a first embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a first permanent magnet according to an embodiment of the present invention.

Description of reference numerals:

a brake assembly: q

A first permanent magnet: 1

A second permanent magnet: 2

An electromagnet: 3, rotor: 4

The shaft of the traction machine: 5 bond: 51

Fixing a frame: 6.

Detailed Description

In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.

Please refer to fig. 1, fig. 2, fig. 3, fig. 4, and fig. 5. The utility model relates to an elevator dish formula permanent magnetism stopper of embodiment. As shown by the dotted line in fig. 1, the disc type permanent magnet brake for an elevator includes two sets of braking members Q disposed vertically symmetrically with respect to a plane on which the rotation axis of the traction machine shaft 5 is located.

As shown in fig. 2, each set of brake assemblies Q comprises a first permanent magnet 1 and an electromagnet 3. The rotor 4 can be directly used as the second permanent magnet 2, i.e. the rotor 4 itself can be made of permanent magnet material in one piece. A combined type may be adopted, that is, as shown in fig. 2, the rotor 4 and the second permanent magnet 2 are formed by combining, the rotor 4 is made of a non-permanent magnetic material, and the second permanent magnet 2 is fixedly installed on one side surface of the peripheral edge of the rotor 4. The first permanent magnet 1 and the electromagnet 3 are fixed on a fixed frame 6, and the fixed frame 6 is made of ferromagnetic materials so as to facilitate the magnetic induction lines to pass through and form a magnetic loop.

The rotor 4 is sleeved on the tractor shaft 5, and the rotor 4 and the tractor shaft 5 are fixedly connected through a key 51 to realize synchronous rotation. The rotor 4 extends along the radial direction relative to the tractor shaft 5, two sets of brake assemblies Q are arranged at the extending position of the rotor 4, the two sets of brake assemblies Q work independently, namely, each set of brake assembly Q can independently realize the braking of the rotor 4, and one brake assembly Q breaks down, so that the work of other brake assemblies Q cannot be influenced.

In every group brake assembly Q, the polarity of first permanent magnet 1 and second permanent magnet 2 is all reverse setting, the north pole of first permanent magnet 1 corresponds the south pole of second permanent magnet 2 promptly, or the south pole of first permanent magnet 1 corresponds the north pole of second permanent magnet 2, its effect is the mutual magnetic attraction that realizes between first permanent magnet 1 and the second permanent magnet 2, first permanent magnet 1 can produce first magnetic field promptly, second permanent magnet 2 can produce the second magnetic field, attract the effect of playing the braking through the magnetic force between first magnetic field and the second magnetic field.

In every group's brake assembly Q, electromagnet 3 all sets up between first permanent magnet 1 and second permanent magnet 2, and electromagnet 3 is fixed in mount 6 on, and electromagnet 3 encircles rotor 4 by iron core and coil and forms. By applying currents with different directions and magnitudes to the electromagnet 3, the electromagnet 3 can generate a third magnetic field with different magnetic field directions and magnetic force magnitudes, and by the fact that the currents of the coils and the magnitude of the braking force have approximate linear corresponding relation, the third magnetic field is selectively provided, the influence of the first magnetic field on the second magnetic field can be controlled, and finally the braking force is controlled.

The specific control mode of the third magnetic field is as shown in fig. 3 and 4, when no current flows in the electromagnet 3, the S pole of the first permanent magnet 1 and the N pole of the second permanent magnet 2 attract each other, and the magnetic induction line passes through the fixed frame 6 and the electromagnet 3 to form a magnetic loop. The rotor 4 is braked under the action of the magnetic attraction of the first permanent magnet 1 to the second permanent magnet 2, and then the brake of the tractor shaft 5 is realized. When current is selectively conducted in the coils of the electromagnet 3, the third magnetic field generated by the electromagnet 3 can magnetically shift the first magnetic field and the second magnetic field, so that the magnetic fields mutually attracted between the first magnetic field and the second magnetic field are weakened or even reduced to zero, the corresponding braking force is gradually weakened or even eliminated, and the rotor 4 is changed from the braked state to the non-braked state.

Further, the third magnetic field can selectively cooperate with the first magnetic field and the second magnetic field to selectively increase the braking force. For example, when the braking force generated by the magnetic attraction between the first magnetic field and the second magnetic field is insufficient, the third magnetic field may be caused to generate an auxiliary magnetic field capable of enhancing the magnetic attraction between the first magnetic field and the second magnetic field by changing the direction and magnitude of the third magnetic field.

As shown in fig. 5, the second permanent magnets 2 may be separated into several independent bodies, and the separated bodies may be uniformly distributed around one side surface of the outer circumferential edge of the rotor 4. The first permanent magnet 1 is also designed in a fan-shaped structure corresponding to the arc direction of the second permanent magnet 2, as shown in fig. 6.

Compared with the prior art, the braking force of the disc type permanent magnet brake of the elevator is provided by the attraction force between the first permanent magnet 1 and the second permanent magnet 2 in each group of braking components Q, and the permanent magnets can provide stable magnetic force, so that the problem of spring failure is avoided, and the disc type permanent magnet brake does not have the contact of materials similar to brake shoes and cannot cause abrasion. In addition, only the change of a magnetic field exists in the brake releasing and contracting processes, the mechanical action in the traditional brake does not exist, the mechanical blocking fault cannot occur, and the reaction speed is higher. In addition, because two groups of mutually independent brake components Q are adopted, if one group fails, the other groups can still complete braking, and the safety and the stability of the operation of the brake are enhanced.

The present invention has been described in relation to the above embodiments, which are only examples for implementing the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, all changes and modifications which do not depart from the spirit and scope of the present invention are deemed to fall within the scope of the present invention.

Claims

1. The disc type permanent magnet brake for the elevator is characterized by comprising a plurality of mutually independent brake assemblies, wherein each brake assembly comprises a first permanent magnet and an electromagnet;

the second permanent magnet is fixedly connected with a tractor shaft and rotates along with the tractor shaft, and the plurality of brake assemblies are dispersedly arranged at positions close to the second permanent magnet;

the first permanent magnets in each set of the brake assemblies provide a first magnetic field, the second permanent magnets provide a second magnetic field, and each first magnetic field independently attracts the second magnetic field to independently provide a braking force for stopping the second permanent magnets from rotating;

2. The elevator disc permanent magnet brake of claim 1, wherein the electromagnet comprises an iron core and a coil, and there is a substantially linear correspondence between the current through the coil and the magnitude of the braking force.

3. The elevator disc permanent magnet brake of claim 1, wherein the third magnetic field selectively cooperates with the first and second magnetic fields to selectively increase the braking force.

4. The elevator disc permanent magnet brake of claim 1, comprising a magnetic circuit comprising a ferromagnetic material for propagating the first, second, and third magnetic fields therethrough.

5. An elevator disc-type permanent magnet brake according to claim 1, comprising a rotor fixed to the machine shaft and extending in a radial direction with respect to the machine shaft, and the second permanent magnet is fixed to a peripheral edge side of the rotor.

6. The elevator disc-type permanent magnet brake of claim 1, wherein a plurality of the brake assemblies each include a mounting bracket, and the first permanent magnet and the electromagnet in each brake assembly are secured to the mounting bracket.

7. The elevator disc permanent magnet brake of claim 1, wherein the first permanent magnet and the second permanent magnet are oppositely poled, i.e., the N or S pole of the first permanent magnet corresponds to the S or N pole of the second permanent magnet.

8. The disc-type permanent magnet brake for elevators according to claim 5, wherein the second permanent magnets are separated into a plurality of pieces and are circumferentially and uniformly distributed on the side of the peripheral edge of the rotor.

9. An elevator disc permanent magnet brake according to claim 1, comprising a rotor fixed to and extending radially relative to the machine shaft, and the rotor is the second permanent magnet.

10. The elevator disc permanent magnet brake of claim 1, comprising two of the brake assemblies, and wherein the two brake assemblies are symmetrically disposed with respect to a plane in which the axis of rotation of the machine shaft lies.