JP2014001064A - Elevator brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator brake device that reduces an operation sound emitted during a brake operation and stabilizes a brake detection operation by a brake switch.SOLUTION: In the elevator, an armature that is provided so as to be movable in an axial direction of a brake disk concentrically mounted to a main shaft of a hoisting machine, and pressed onto the brake disk to apply a braking force to the hoisting machine, is provided with a switch pressing member that is pivotally supported so as to be slidable in a movement direction of the armature, and slid to presses a brake switch when the armature is separated from the brake disk by the excitation of an electromagnet, whereby a sliding width of the armature and a sliding width of the switch pressing member are individually set.

Description

  The present invention relates to an elevator brake device that stabilizes brake operation detection and reduces brake operation noise.

  As shown in FIG. 4, the brake device incorporated in the elevator hoisting machine is freely movable in the axial direction of the brake disk 2 mounted coaxially to the main shaft 1 a of the hoisting machine 1. The armature 3 provided in is provided. The armature 3 plays a role of applying a braking force to the hoisting machine 1 by sandwiching the brake disk 2 between the case end surface of the hoisting machine 1.

  The armature 3 is attracted toward the coil case 4 against the compression spring 6 interposed between the armature 3 and the coil case 4 by exciting the electromagnet 5 housed in the coil case 4. The brake is released. Then, by demagnetizing the electromagnet 5, the armature 3 is pressed against the brake disc 2 by the restoring force of the compression spring 6, and the brake is applied. In the figure, reference numeral 7 denotes a friction member incorporated in the brake disk 2 (see, for example, Patent Document 1).

  The coil case 4 incorporates a brake switch 9 that is attached to the armature 3 and pressed and urged by a striker bolt 8 that advances and retreats integrally with the armature 3. The brake switch 9 detects the braking operation, and particularly the electromagnet 5 detects that the armature 3 has been pulled away from the brake disk 2, that is, the release of the brake (see, for example, Patent Document 2).

JP 2004224453 A JP-A-10-53385

  By the way, in the brake device having the above-described configuration, the armature 3 and the striker bolt 8 are moved forward and backward integrally. Therefore, the movement stroke of the striker bolt 8 for energizing (turning on) the brake switch 9 is the movement stroke of the armature 3. Determined by. On the other hand, in order to operate the brake switch 9 stably, it is necessary to set the movement stroke of the striker bolt 8 to be large to some extent. However, in order to set the movement stroke of the striker bolt 8 to be large, it is necessary to increase the movement stroke of the armature 3 accordingly. When the movement stroke of the armature 3 is increased, the operation sound (noise) during braking is increased. There will be conflicting problems.

  The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide an elevator brake device that can reduce operation noise during braking and stabilize the brake detection operation by the brake switch. It is to provide.

In order to achieve the above-mentioned object, an elevator brake device according to the present invention is provided so as to be movable in the axial direction of a brake disk coaxially mounted on a main shaft of a hoisting machine, and is pressed against the brake disk so as to move the hoisting machine. An armature that applies a braking force to the machine, a compression spring that presses the armature against the brake disk, an electromagnet that attracts the armature against the compression spring by excitation and pulls it away from the brake disk, and is pulled away from the brake disk A coil case that houses a brake switch that detects the armature;
A switch pressing member that is pivotally supported by the armature so as to be slidable in the moving direction of the armature, is attracted by excitation of the electromagnet, slides toward the coil case, and presses the brake switch, and the switch pressing member and the armature And an elastic body that biases and biases the switch pressing member toward the brake disc.

  According to the brake device having the above configuration, the movement stroke of the armature and the movement stroke of the switch pressing member can be individually set, so that the gap between the brake disc and the armature is narrowed to operate at the time of braking operation. The noise can be reduced, and the brake switch can be operated stably and reliably by increasing the moving stroke of the switch pressing member to some extent, and the brake detection operation can be stabilized.

The fragmentary sectional view which shows the principal part schematic structure of the brake device of the elevator which concerns on one Embodiment of this invention. The top view which shows the arrangement | positioning relationship between the armature shown in FIG. 1, and a switch press member. The figure which shows the modification of the attachment structure of the switch press member to an armature. The fragmentary sectional view which shows the principal part schematic structure of the brake device of the conventional elevator.

  Hereinafter, a brake device according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a schematic configuration of a main part of a brake device, FIG. 2 is a plan view showing an arrangement relationship between an armature and a switch pressing member shown in FIG. It is attached. The brake disc 2 mounted coaxially to the main shaft 1a of the hoisting machine 1 is a disc body having a diameter smaller than the size of the outer case 1b of the hoisting machine 1, and an annular friction member 7 is provided on each of both surfaces thereof. Is attached. A support column 11 having a predetermined length is erected on an end surface of the outer case 1b so as to surround the brake disc 2 in parallel with the main shaft 1a.

  The armature 3 is provided with a through hole 3a that is inserted into the support column 11, and is provided so as to be movable in the axial direction of the main shaft 1a, that is, in the direction of contacting and separating from the brake disc 2 with the support column 11 as a guide. The armature 3 plays a role of applying braking to the rotation of the brake disk 2 and thus to the hoisting machine 1 by sandwiching the brake disk 2 between the end face of the outer case 1b.

  On the other hand, a coil case 4 is attached to the distal end portion of the support 11 in accordance with the center position of the armature 3. The coil case 4 is attached to the column 11 by screwing a bolt 12 inserted through a through hole 4a formed in the coil case 4 into the tip of the column 11. As a result, the mounting height (distance) W of the coil case 4 from the end surface of the outer case 1b is regulated, and at the same time, the slide width (movement stroke) AS of the armature 3 is determined. Incidentally, the slide width (movement stroke) AS of the armature 3 is determined from the distance W between the end surface of the outer case 1 b and the coil case 4, the thickness of the brake disk 2 including the friction member 7, and the thickness of the armature 3. The remaining dimensions after subtracting.

  Here, the coil case 4 has a ring-shaped coil forming the electromagnet 5 embedded in a surface facing the armature 3, and a compression spring that presses and urges the armature 3 toward the brake disk 2 side. 6 and a brake switch 9 for detecting the armature 3 separated from the brake disk 2 is provided. The compression spring 6 is composed of, for example, a plurality of coil springs, and is fitted into the armature 3 by being fitted into a plurality of holes 4b formed in the surface of the coil case 4 facing the armature 3, respectively. . These hole portions 4b are provided in an annular shape at equiangular intervals, for example, at positions spaced from the center of the coil case 4 by a predetermined distance. Therefore, the armature 3 is uniformly pressed in the axial direction by a plurality of compression springs 6 fitted in the holes 4b.

  In addition, as shown in FIG. 2, a circular recess 4c having a predetermined depth is formed at the end of the surface of the coil case 4 facing the armature 3, avoiding the embedded position of the electromagnet 5. The brake switch 9 is provided at the bottom of the recess 4c. That is, with respect to the mounting positions of the brake switch 9 and the switch pressing member 14, as shown by a broken line in FIG. 2, a part of the annular electromagnet 5 is replaced with the circular recess 4 c into which the brake switch 9 is incorporated. Avoid it and bend it. As a result, the magnetic force of the electromagnet 5 can be prevented from adversely affecting the brake switch 9. The brake switch 9 is turned on when a pressing member protruded from the surface (upper surface) is pressed against a switch pressing member described later, and the armature 3 separated from the brake disk 2 is turned on. Take the role of detecting. An auxiliary electromagnet 13 that is excited simultaneously with the electromagnet 5 and attracts the switch pressing member is embedded around the brake switch 9.

  On the other hand, the switch pressing member 14 described above is provided at a position facing the brake switch 9 of the armature 3. The switch pressing member 14 corresponds to a striker bolt 8 in a conventional brake device (see FIG. 4), and serves to press the brake switch 9 when the armature 3 is pulled away from the brake disc 2. Bear.

  In particular, the switch pressing member 14 projects through a through hole 3b provided in the armature 3 so as to be slidably supported in the axial direction and a surface of the armature 3 facing the brake switch 9. And a metal disk-like pressing body 14b mounted on one end of the shaft body 14a. Furthermore, a disc-shaped spring receiving portion 14c is provided at the other end of the shaft body 14a, and a coil spring (elastic body) 14d is interposed between the spring receiving portion 14c and the armature 3. ing. For example, a non-magnetic body (not shown) for preventing the armature 3 from adsorbing is provided on the surface of the pressing body 14b facing the armature 3.

  Further, the surface of the armature 3 facing the brake disk 2 is formed with a circular recess 3c that supports the coil spring 14d and allows the disk-shaped spring receiving portion 14c to enter. The spring receiving portion 14c is biased toward the brake disk 2 by the coil spring 14d accommodated in the circular recess 3c. Due to the biasing bias of the coil spring 14d, the switch pressing member 14 slides to a position where the pressing body 14b contacts the armature 3.

  When an attractive force acts on the switch pressing member 14 (metal pressing body 14b) by the excitation of the auxiliary electromagnet 13, the switch pressing member 14 slides toward the brake switch 9 against the coil spring 14d. Displace. The slide width SS of the switch pressing member 14 is a distance obtained by subtracting the spring length when the coil spring 14d is compressed from the distance between the spring receiving portion 14c and the bottom surface of the circular recess 3b. When the switch pressing member 14 is slid toward the brake switch 9, the pressing member 14b pushes the pressing member of the brake switch 9, and the brake switch 9 performs a switching operation. That is, the release of the armature 3 from the brake disc 2 (release of the brake) is detected by the brake switch 9.

  According to the brake device configured in this way, when the electromagnet 5 and the auxiliary electromagnet 13 are in a demagnetized state, the armature 3 is pressed by the compression spring 6 and is braked between the end surface of the outer case 1b. 2 is inserted and a braking force is applied to the brake disk 2 (brake operation). At this time, the pressing body 14 b of the switch pressing member 14 is separated from the brake switch 9. Therefore, the operation of the brake is detected from the OFF state of the brake switch 9.

  On the other hand, when the electromagnet 5 and the auxiliary electromagnet 13 are excited, the armature 3 is slid to the coil case 4 side by receiving the attractive force of the electromagnet 5, and the sandwiching of the brake disk 2 is released (brake release). At the same time, the switch pressing member 14 slides toward the coil case 4 by receiving the attractive force of the auxiliary electromagnet 13. The slide amount of the armature 3 at this time is the slide width AS described above, and the slide amount of the switch pressing member 14 with respect to the armature 3 is the slide width SS. As a result, the total slide amount of the switch pressing member 14 is [AS + SS], and the slide displacement is larger than that of the armature 3.

  Therefore, according to the brake device having the above-described configuration, the movement stroke (slide) of the switch pressing member 14 is reduced while the movement stroke (slide width AS) of the armature 3 is set small to reduce the operation sound (noise) during the brake operation. The width AS + slide width SS) can be set large to ensure a stable and reliable switch operation of the brake switch 9. In other words, since the movement stroke of the armature 3 and the movement stroke of the switch pressing member 14 can be individually set, the operation noise during the brake operation is reduced and the brake detection operation by the brake switch is stabilized. Can be planned.

  In addition, as shown by a broken line in FIG. 2, a part of the annular electromagnet 5 is bent to avoid the circular recess 4c into which the brake switch 9 is incorporated. Instead, the brake switch 9 may be provided at a position overlapping the annular electromagnet 5. Further, instead of the coil spring 14d biasing and biasing the switch pressing member 14 toward the brake disc 2, the switch pressing member 14 can be biased using elastic rubber having high elasticity.

  Further, as shown in FIG. 3, an adjustment screw 14e is screwed onto the spring receiving portion 14c of the switch pressing member 14, and the protrusion length of the adjustment screw 14e with respect to the bottom surface of the circular recess 3b is adjusted. It is also useful to adjust the slide width SS of the member 14 so as to be adjustable. An adjustment screw 14e is provided on the armature 3 side, and the slide width SS of the switch pressing member 14 is adjusted by regulating the penetration depth of the spring receiving portion 14c of the switch pressing member 14 into the circular recess 3b. It may be possible.

  In addition, the arrangement and size (dimensions) of the components of the brake device may be determined according to the specifications of the brake device. Needless to say, when the electromagnet 5 is excited, the metal armature 3 and the metal pressing body 14b of the switch pressing member 14 are not attracted to each other. In addition, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Hoisting machine 1a Main shaft 2 Brake disk 3 Armature 4 Coil case 5 Electromagnet 6 Compression spring 7 Friction member 9 Brake switch 11 Post 12 Bolt 13 Auxiliary electromagnet 14 Switch pressing member 14a Shaft body 14b Press body 14c Spring receiving part 14d Coil spring (elasticity) body)
14e Adjustment screw

  In order to achieve the above-described object, an elevator brake device according to the present invention includes a brake disk that is coaxially mounted on a main shaft of a hoisting machine, and is provided so as to be movable in the axial direction of the brake disk and pressed against the brake disk. An armature that applies a braking force to the hoisting machine, a compression spring that presses the armature against the brake disc, an electromagnet that attracts the armature against the compression spring by excitation and pulls it away from the brake disc, simultaneously with the electromagnet A coil case that houses an auxiliary electromagnet to be excited and a brake switch that detects an armature separated from the brake disk, and is supported by the armature so as to be slidable in the moving direction of the armature, and is attracted by the excitation of the electromagnet. Sliding the coil case A switch pressing member that presses the brake switch and a compression spring or elastic rubber that is interposed between the switch pressing member and the armature and biases the switch pressing member toward the brake disc. The switch pressing member is attracted by an auxiliary electromagnet excited simultaneously with the electromagnet and slides to a position for pressing the brake switch.

Claims (5)

A brake disc coaxially mounted on the main shaft of the hoist,
An armature that is provided so as to be movable in the axial direction of the brake disc, and that applies a braking force to the hoisting machine when pressed against the brake disc;
A compression spring that presses the armature against the brake disc, an electromagnet that attracts the armature against the compression spring by excitation and separates it from the brake disc, and a brake switch that detects the armature separated from the brake disc are housed A coil case,
A switch pressing member that is pivotally supported by the armature so as to be slidable in the moving direction of the armature, is attracted by excitation of the electromagnet, and slides toward the coil case to press the brake switch;
An elastic body interposed between the switch pressing member and the armature to bias the switch pressing member toward the brake disc;
An elevator brake device comprising:   The elevator brake device according to claim 1, wherein the elastic body is made of a compression spring or elastic rubber.   The elevator brake device according to claim 1, wherein the switch pressing member is provided on the coil case and is slid to a position to press the brake switch by being attracted by an auxiliary electromagnet excited simultaneously with the electromagnet.   The elevator brake device according to claim 3, wherein the switch pressing member is further provided with a stroke adjusting mechanism for adjusting a width of the slide.   The elevator braking device according to claim 4, wherein the stroke adjusting mechanism is an adjusting screw that is provided on the switch pressing member and compresses the elastic body to set an urging bias position of the switch pressing member.

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