CN211971429U - Elevator Disc Permanent Magnet Brake - Google Patents

Abstract

The utility model provides an elevator disc-type permanent magnet brake, which comprises several groups of mutually independent brake assemblies, each group of the brake assemblies includes a first permanent magnet, a second permanent magnet and an electromagnet; The second permanent magnets in the moving assembly are all fixedly connected with the traction machine shaft and rotate with the traction machine shaft; the electromagnets in each group of the braking assemblies are arranged on the first permanent magnet and the traction machine shaft. Between the second permanent magnets; between the adjacent two groups of the braking assemblies, there is a magnet isolation body for blocking the magnetic field, and the elevator disc permanent magnet brake adopts magnetic braking, which can effectively avoid the existence of mechanical braking. of various mechanical failures.

Description

Elevator Disc Permanent Magnet Brake

technical field

The utility model relates to the field of elevator braking, in particular to an elevator disc-type permanent magnet brake.

Background technique

The elevator brake is a key component to ensure the normal and safe operation of the elevator. When the elevator car stops running, the brake holds the brake to keep the elevator car at the leveling or required position.

Traditional elevator brakes include disc brakes, block brakes and butterfly brakes, and their working principles are basically the same, that is, when the electromagnet is energized, the electromagnetic force overcomes the elastic force of the spring to disengage the brake shoe from the brake wheel (release the brake). ), when the electromagnet loses power, the brake shoe fits with the brake wheel under the action of the spring to achieve braking (holding brake).

Since the above-mentioned traditional elevator brake relies on the spring to push the brake shoe to reset and brake, the existing problems include: insufficient or lost braking force due to the failure of the spring elastic force, insufficient braking force caused by wear of the brake shoe, and mechanical movement jam which affects braking, etc.

Utility model content

In view of the above problems, the utility model provides an elevator disc permanent magnet brake, which removes mechanical components such as springs and brake shoes, which can significantly reduce the failure rate of the brake and enhance the safety of the brake.

The utility model adopts the following technical solutions:

An elevator disc-type permanent magnet brake, characterized in that it includes several groups of mutually independent braking assemblies, and each group of the braking assemblies includes a first permanent magnet, a second permanent magnet and an electromagnet;

The second permanent magnets in each group of the braking assemblies are fixedly connected with the hoisting machine shaft and rotate with the hoisting machine shaft; the first permanent magnets in each group of the braking assemblies provide the first permanent magnet a magnetic field, each of the second permanent magnets provides a second magnetic field, the first magnetic field attracts the second magnetic field to provide a braking force that stops the rotation of the second permanent magnet;

In each group of the braking assemblies, the electromagnet is disposed between the first permanent magnet and the second permanent magnet, and the electromagnet selectively provides a third magnetic field, and the third magnetic field controls the effect of the first magnetic field on the second magnetic field to control the braking force;

Between the adjacent two groups of the braking assemblies, a magnet isolation body for blocking the magnetic field is arranged.

Preferably, the electromagnet includes an iron core and a coil, and there is a substantially linear correspondence between the current passing 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 including a ferromagnetic material for propagating through the first magnetic field, the second magnetic field and the third magnetic field.

Preferably, it includes a rotor fixed to the traction machine shaft and extending radially relative to the traction machine shaft, and a plurality of the second permanent magnets parallel to each other are fixed on the outer circumference of the rotor.

Preferably, a fixing frame surrounding the rotor is included, and the first permanent magnet, the electromagnet and the magnet isolation body are all fixed on the fixing frame.

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

Preferably, each of the second permanent magnets in each group of the braking assemblies is separated into several pieces, and is uniformly distributed around the outer circumference of the rotor.

Preferably, each of the first permanent magnets in each group of the braking assemblies is separated into several and evenly distributed around the outer circumference of the rotor, and the separated number corresponds to the second permanent magnet.

Preferably, the magnet isolation body includes a substance or component with the function of blocking or shielding the magnetic field.

Compared with the prior art, the beneficial effects of the present utility model are: the braking force is provided by the attractive force between the first permanent magnet and the second permanent magnet, and since the permanent magnet can provide a stable magnetic force, the problem of spring failure is avoided, And there is no material contact similar to the brake shoe, and it will not cause wear; there is only a change in the magnetic field in the process of releasing the brake and holding the brake, there is no mechanical action in the traditional brake, there will be no mechanical jamming fault, and the response speed is faster. Fast; several groups of independent braking components are used. If one group fails, the other groups can still complete the braking, which enhances safety and stability.

Description of drawings

FIG. 1 is a schematic structural diagram of an elevator disc permanent magnet brake according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a magnetic field corresponding to FIG. 1 in a state of a brake.

FIG. 3 is a schematic diagram of a magnetic field corresponding to FIG. 1 in a state of releasing the brake.

4 is a schematic structural diagram of the rotor and the second permanent magnet according to the first embodiment of the present invention.

Description of reference numbers:

Brake kit: Q

First permanent magnet: 1

Second permanent magnet: 2

Electromagnets: 3 Rotors: 4

Traction shaft: 5 Keys: 51

Fixtures: 6

Magnetic spacer: 7.

Detailed ways

In order to have a further understanding of the purpose, structure, features, and functions of the present utility model, the following detailed descriptions are given in conjunction with the embodiments.

Please refer to Figure 1, Figure 2, Figure 3, and Figure 4 in combination. An elevator disc permanent magnet brake according to an embodiment of the present utility model. As shown by the dotted line in FIG. 1 , the elevator disc permanent magnet brake includes three sets of braking assemblies Q, and each set of braking assemblies Q includes a first permanent magnet 1 , a second permanent magnet 2 and an electromagnet 3 . The three groups of brake assemblies Q work independently of each other, that is, each group of brake assemblies Q can independently brake the rotor 4, and the failure of one brake assembly Q will not affect the work of other brake assemblies Q.

The rotor 4 is sleeved on the hoisting machine shaft 5, and the rotor 4 and the hoisting machine shaft 5 are fixedly connected by a key 51 to realize synchronous rotation. The rotor 4 extends radially with respect to the hoisting machine shaft 5 , and its extension is surrounded by a fixed frame 6 once.

As shown in FIG. 1 , the rotor 4 and the second permanent magnets 2 are fixed in combination, the rotor 4 is made of non-permanent magnetic material, the three second permanent magnets 2 are fixedly installed on the outer circumference of the rotor 4, and the three second permanent magnets 2 are fixedly mounted on the outer circumference of the rotor 4. The permanent magnets 2 are parallel to each other. The first permanent magnet 1, the electromagnet 3 and the magnet-isolating body 7 are all fixed on the fixing frame 6, and the fixing frame 6 is made of ferromagnetic material, so as to facilitate the passage of the magnetic field lines and form a magnetic circuit.

In each group of braking assemblies Q, the polarities of the first permanent magnet 1 and the second permanent magnet 2 are set in opposite directions, that is, the N pole of the first permanent magnet 1 corresponds to the S pole of the second permanent magnet 2, or the first permanent magnet 1 corresponds to the S pole of the second permanent magnet 2. The S pole of the permanent magnet 1 corresponds to the N pole of the second permanent magnet 2, and its function is to realize the mutual magnetic attraction between the first permanent magnet 1 and the second permanent magnet 2, that is, the first permanent magnet 1 can generate a first magnetic field, The second permanent magnet 2 can generate a second magnetic field, and can act as a brake through the magnetic attraction between the first magnetic field and the second magnetic field.

In each set of brake assemblies Q, the electromagnet 3 is arranged between the first permanent magnet 1 and the second permanent magnet 2, and the electromagnet 3 is fixed on the fixing frame 6, and the electromagnet 3 is surrounded by an iron core and a coil around the rotor 4. form. By passing currents of different directions and magnitudes to the electromagnet 3, the electromagnet 3 will be able to generate a third magnetic field with different magnetic field directions and magnitudes, and there is a roughly linear correspondence between the current passing through the coil and the magnitude of the braking force, Selectively providing the third magnetic field can control the influence of the first magnetic field on the second magnetic field, and finally realize the control of the braking force.

The specific control method of the third magnetic field is shown in Figures 2 and 3. When no current flows through the electromagnet 3, the N pole of the first permanent magnet 1 and the S pole of the second permanent magnet 2 attract each other, and the magnetic field lines pass through The fixed frame 6 and the electromagnet 3 form a magnetic circuit. The rotor 4 is braked under the action of the magnetic attraction force of the first permanent magnet 1 to the second permanent magnet 2 , thereby realizing the braking of the hoisting machine shaft 5 . When a current is selectively passed through the coil of the electromagnet 3, the third magnetic field generated by the electromagnet 3 can magnetically offset the first magnetic field and the second magnetic field, so that the first magnetic field and the second magnetic field attract each other The magnetic field is weakened, or even reduced to zero. At this time, the corresponding braking force gradually weakens or even disappears, and the rotor 4 changes from the braked state to the non-braking state.

In addition, the third magnetic field can selectively cooperate with the first magnetic field and the second magnetic field, thereby selectively increasing the braking force. For example, when the braking force generated by the magnetic attraction force between the first magnetic field and the second magnetic field is insufficient, the direction and size of the third magnetic field can be changed so that the third magnetic field can be generated to enhance the magnetic attraction force between the first magnetic field and the second magnetic field. auxiliary magnetic field.

As shown in FIG. 4 , the second permanent magnets 2 in each group of braking assemblies Q can be separated into several independent units, and the separated units can be evenly distributed around the outer circumference of the rotor 4 . At this time, corresponding to the above-mentioned arrangement of the second permanent magnets 2, the first permanent magnets 1 in each group of brake assemblies Q can also be separated into several independent individuals that are evenly distributed around the outer circumference of the rotor 4, and The number of separation and the number of the second permanent magnets 2 should correspond to each other.

In order to ensure that the magnetic fields between the two adjacent groups of braking assemblies Q will not affect each other, a magnet isolation body 7 is provided between the adjacent two groups of braking assemblies Q. The magnet isolation body 7 is used to block the magnetic field, and the isolation magnet 7 may have a barrier The substance or component with the magnetic field function can also be the material or component with the function of shielding the magnetic field. If the magnet isolation body 7 blocks the magnetic field by means of shielding, the magnet isolation body 7 can also be designed to enclose each braking component Q in the form.

Compared with the prior art, the braking force of the elevator disc permanent magnet brake is provided by the attractive force between the first permanent magnet 1 and the second permanent magnet 2 in each set of braking assemblies Q, since the permanent magnets can provide stable The magnetic force avoids the problem of spring failure, and there is no material contact similar to the brake shoe, and it will not cause wear. In addition, there is only a change in the magnetic field in the process of releasing the brake and holding the brake, and there is no mechanical action in the traditional brake, no mechanical jamming failure, and faster response. In addition, since three sets of mutually independent braking components Q are used, if one set fails, the other sets can still complete the braking, which enhances the safety and stability of the brake operation.

The present invention has been described by the above-mentioned related embodiments, but the above-mentioned embodiments are only examples of implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present utility model belong to the scope of patent protection of the present utility model.

Claims (10)

1. an elevator disc permanent magnet brake, is characterized in that, comprises several groups of mutually independent brake assemblies, and each group of described brake assemblies all comprises first permanent magnet, second permanent magnet and electromagnet; The second permanent magnets in each group of the braking assemblies are fixedly connected with the traction machine shaft and rotate with the traction machine shaft; The first permanent magnets in each group of the braking assemblies provide a first magnetic field, the second permanent magnets provide a second magnetic field, and the first magnetic field attracts the second magnetic field to provide the second magnetic field. The braking force to stop the rotation of the permanent magnet; In each group of the braking assemblies, the electromagnet is disposed between the first permanent magnet and the second permanent magnet, and the electromagnet selectively provides a third magnetic field, and the third magnetic field controls the effect of the first magnetic field on the second magnetic field to control the braking force; Between the adjacent two groups of the braking assemblies, a magnet isolation body for blocking the magnetic field is arranged. 2. The elevator disc permanent magnet brake according to claim 1, wherein the electromagnet comprises an iron core and a coil, and there is a substantially linear correspondence between the current passing through the coil and the magnitude of the braking force relation. 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 according to claim 1, characterized by comprising a magnetic circuit comprising a ferromagnetic material for making the first magnetic field, the second magnetic field and the A third magnetic field propagates through. 5. The elevator disc permanent magnet brake according to claim 1, characterized in that it comprises a rotor fixed to the traction machine shaft and extending radially relative to the traction machine shaft, and the rotor A plurality of the second permanent magnets parallel to each other are fixed on the outer periphery. 6. The elevator disc permanent magnet brake according to claim 5, characterized in that it comprises a fixed frame surrounding the rotor, and the first permanent magnet, the electromagnet and the magnet isolation body are all fixed on the fixed frame. the fixing bracket. 7 . The elevator disc permanent magnet brake according to claim 1 , wherein the polarities of the first permanent magnet and the second permanent magnet are set in opposite directions, that is, N or N of the first permanent magnet The S pole corresponds to the S or N pole of the second permanent magnet. 8 . The elevator disc permanent magnet brake according to claim 5 , wherein each of the second permanent magnets in each group of the brake assemblies is separated into several pieces, and is uniformly distributed around the outer circumference of the rotor. 9 . . 9 . The elevator disc permanent magnet brake according to claim 8 , wherein each of the first permanent magnets in each group of the brake assemblies is separated into several and evenly distributed around the outer circumference of the rotor, 10 . And the number of separation corresponds to the second permanent magnet. 10 . The elevator disc permanent magnet brake according to claim 5 , wherein the magnet isolation body comprises a substance or component with the function of blocking or shielding the magnetic field. 11 .

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