JPH0698497A - Electromagnetic disk brake - Google Patents

Abstract

PURPOSE:To detect the abnormality of a semi-attraction state of an electromagnetic brake device in the ascending and descending of a riding cage. CONSTITUTION:In an electromagnetic disk brake, an outer disk 1, an inner disk 2, an armature 3 and an electromagnet 4 which are provided with through holes in their center are arranged and installed at the shift end part of a rotating machine to be braked in such a way that the axial center of the through holes coincides with the axial center of the rotating machine, the inner disk 2 is coupled to the shaft of the rotating machine to be braked so as to be turned together and so as to be moved freely in the axial direction, and the outer disk 1 and the electromagnet 4 are restrained with reference to the turning direction of at least the rotating machine to be braked. In the electromagnetic disk brake, the armature 3 is installed by making a long-hole-shaped hole in its peripheral part and so as to be turned in the turning direction of the rotating machine to be braked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic disc brake, and more particularly to a structure for detecting an abnormality in the electromagnetic disc brake while a car is being lifted and lowered.

[0002]

2. Description of the Related Art An electromagnetic disc brake is disclosed in Japanese Patent Laid-Open No. 50-97.
As described in Japanese Patent Publication No. 810 and Japanese Patent Laid-Open No. 50-108513, it is provided at a shaft end or the like as a braking device for a rotating machine such as a motor. Various structures of electromagnetic disc brakes are known, but basically, a disc-shaped armature or lining plate made of metal is engaged with the shaft of a rotating machine to form a certain gap in the disc. The discs made of metal are made to face each other through the discs, and the discs are fixed in the rotational direction.By combining the electromagnetic force and the elastic force of springs, etc., the armature and the discs are brought into contact with and separated from each other. Alternatively, the brake is released.

[0003]

However, in the above-described conventional electromagnetic disc brake, the disc and the armature are in a semi-adsorbed state for some reason while the elevator is moving up and down, and the elevator is operated in that state. Abnormal wear of the lining and a significant reduction in the braking force of the brake could lead to a very serious safety situation. An object of the present invention is to provide an electromagnetic disc brake capable of detecting a semi-adsorbed state between an armature and a disc.

[0004]

In order to achieve the above object, the present invention provides an outer disk, an inner disk, an armature and an electromagnet each having a through hole in the center thereof, and the shaft core of the through hole of a braked rotating machine. Aligning with the shaft center, while being arranged in a row at the shaft end of the braked rotating machine, the inner disk can be rotated together with the shaft of the braked rotating machine, and is engaged freely axially movable, In an electromagnetic disc brake in which the outer disc and the electromagnet are constrained at least with respect to the rotation direction of the braked rotating machine, the armature is provided with a long hole in its peripheral portion, and the armature is provided with respect to the rotation direction of the braked rotating machine. The armature is rotatably supported, and a switch is provided at at least one position of the armature.

[0005]

As described above, when the armature and the disk are in a semi-adsorbed state during driving of the elevator by providing the elongated hole in the peripheral portion of the armature and rotating the armature in the rotating direction of the braked rotating machine, , The brake torque causes the armature to rotate. At this time, the rotation of the armature can be detected by the switch provided on the armature, and the abnormality in the semi-suction state can be detected.

[0006]

EXAMPLES Examples of the present invention will be described below.

1 to 5 show an electromagnetic disc brake according to an embodiment of the present invention. The electromagnetic disc brake of this embodiment is applied to the elevator hoisting machine shown in FIG. As shown in FIG. 4, the elevator has a hoistway 51.
A machine room 52 is arranged at the top of the machine room, a hoisting machine 53 is installed inside the machine room 52, a rope 55 is wound around a sheave 54 of the hoisting machine 53, and a car 56 and a weight 57 are attached to the rope 55. And are suspended in a hanging manner, and the hoisting machine 53 is driven to raise and lower the car 56 to a predetermined floor.
As shown in FIG. 5, the hoisting machine 53 includes an electric motor 58, a speed reducer 59, a sheave 54, and an electromagnetic disk brake 60. The electromagnetic disk brake 60 is a speed reducer 5.
It is provided in association with 9 input shafts.

Details of one embodiment of the electromagnetic disc brake 60 will be described with reference to FIGS.

FIG. 1 is a sectional view taken along the axial direction, and FIG.
Is a side view seen from the shaft end side, and FIG. 3 is a sectional view taken along the line III-III in FIG. As shown in these drawings, the electromagnetic disc brake 60 includes an outer disc 1, an inner disc 2, an armature 3 and an electromagnet 4 each having a through hole at the center thereof, and a shaft of the through hole serving as a braking rotary machine. They are aligned at the shaft end of the input shaft 61 of the machine 59 and are arranged in a row. The outer disc 1 is formed of a metal material in a disc shape. The inner disc 2 is
A disk-shaped core plate 2A made of a metal material,
The lining plate 2B is formed by covering the periphery of the core plate 2A. The core plate 2A is provided with a spline hole that meshes with the spline groove of the spline boss 6 fixed to the shaft 61, and is attached so as to be rotatable with the shaft 61 and freely in the axial direction. In addition,
The lining plate 2B is made of a wear resistant material. In addition, in this embodiment, the inner plate 2A and the lining plate 2B are formed separately.
May be integrally formed of a wear resistant material. On the other hand, the armature 3 and the outer disk 1 are attached by a guide pin 7 fixed to an electromagnet 4 so as to be movable in the axial direction. The position of the outer disk 1 can be adjusted by an adjusting nut 8 screwed onto the end of the guide pin 7. Further, the electromagnet 4 is fixedly attached to the machine frame of the speed reducer 59 by a plurality of mounting bolts 5,
A through hole is formed at the center of the disk-shaped core 4A, and the core 4
A concave portion concentric with the through hole is formed on one surface of A, and the coil 4B is wound around this concave portion, and the inner disc surface and the outer disc surface of the coil 4B are respectively the inner magnetic pole 4C and the outer magnetic pole 4D.
The surface on the magnetic pole side is arranged so as to face one surface of the armature 3. Further, a coil-shaped braking spring 9 for pressing the armature 3 toward the inner disc 2 side is provided in the through hole at the center of the electromagnet 4A, as shown in FIG. Further, as shown in FIG. 3, a plurality of pins 13 are provided in the outer magnetic pole 4D portion of the core 4A in the circumferential direction, and are concentric with the pin 13 in a direction to widen the gap between the outer disk 1 and the electromagnet 4. Biased coil spring 1
2 is loosely fitted.

Stopper hole 1 provided in the armature 3
No. 0 has a long hole shape, so armature 3
Is installed so as to be rotatable in the rotating direction of the braked rotating machine. Further, a protrusion 28 is provided on the lower portion of the armature 3, and a micro switch 30 (30A, 30B) is provided on a fixing member (not shown) so as to face the direction of rotation of the protrusion 28. The detection signal of the micro switch 30 is fed back to the control device 32 that controls the operation of the hoisting machine 53.

In the electromagnetic disc brake thus constructed, the coil 4B of the electromagnet 4 is energized and the armature 3 is energized.
When it is sucked against the braking spring 9, the inner disc 2
Freely rotates between the outer disc 1 and the armature 3, and the brake of the hoisting machine 53 is released. On the contrary, when the energization of the coil 4B is stopped, the armature 3 is strongly pressed toward the outer disc 1 by the braking spring 9. As a result, the inner disc 2 is strongly held between the fixed outer disc and the armature 3, so that the rotation thereof is restricted and the hoisting machine 53 is braked.

On the other hand, the microswitch 30 has a car 5
6 has a circuit configuration that operates during traveling, and is designed to operate only for signals that continue for a predetermined time or longer. That is, the elevator 56, the car 56 and the weight 5
When operating in a direction opposite to the direction of weight imbalance with 7, the electromagnetic disk brake 60 will have some abnormality, for example, the astringency between the armature 3 and the guide pin 7, or the inclusion of foreign matter between the electromagnet 4 and the armature 3. In the case where the semi-sucking state is reached by such a method, it is detected and the traveling of the car 56 is stopped. If the armature 3 is in a semi-adsorbed state on the electromagnet 4 and comes into contact with the inner disc 2 while the car 56 is traveling in the direction opposite to the weight unbalance direction, brake torque is generated due to the frictional force, and the armature 3 is rotationally displaced. . This rotational displacement turns on the microswitch 30 and stops the hoisting machine 53 via the control device 32 based on the detection signal. Car basket 56
If the inner disk 2 and the armature 3 continue to run without stopping the brake, the lining 2B will be abnormally worn and the braking force will decrease, and in the worst case, braking will be impossible. According to the embodiment, when the car 56 is raised or lowered, it is possible to detect an abnormality of the electromagnetic disc brake 60 at least when the elevator is driven in the direction opposite to the weight unbalance direction.

The gap size g between the armature 3 and the electromagnet 4 shown in FIG. 1 is adjusted by turning the adjusting nut 8 and moving the outer disk 1 in the axial direction.

[0014]

According to the present invention, in an electromagnetic disc brake, the armature is provided with elongated holes in its peripheral portion,
Since it is provided so as to be rotatable in the rotation direction of the braked rotating machine, the abnormality of the brake device during the raising and lowering of the car can be detected as described above.

[Brief description of drawings]

FIG. 1 is a sectional view taken along the axis of an electromagnetic disc brake.

FIG. 2 is a side view of an embodiment of the present invention.

FIG. 3 is a partial detailed view of an embodiment of the present invention.

FIG. 4 is an explanatory diagram of main parts of an elevator.

FIG. 5 is a plan view of an elevator hoisting machine.

[Explanation of symbols]

1 ... Outer disc, 2 ... Inner disc, 2A ...
Core plate, 2B ... Lining plate, 3 ... Armature, 4 ... Electromagnet, 4A ... Core, 4B ... Coil, 4C ...
Inner magnetic pole, 4D ... Outer magnetic pole, 6 ... Spline boss, 9 ...
Braking spring, 61 ... Input shaft.

Claims (2)

[Claims] 1. An outer disk, an inner disk, an armature and an electromagnet, each of which has a through hole at the center thereof, with the shaft center of the through hole aligned with the shaft center of the braked rotary machine. The inner disks are arranged at the ends, and the inner disks are engaged with the shaft of the braked rotating machine so as to be rotatable with respect to the shaft and freely move in the axial direction, so that the outer disk and the electromagnet rotate at least the braked rotating machine. In the electromagnetic disc brake restrained against the direction,
An electromagnetic disc brake, wherein an elongated hole is provided in a peripheral portion of the armature, and the armature is supported so as to be rotatable by a predetermined displacement amount in a rotation direction of the braked rotating machine. 2. The electromagnetic disc brake according to claim 1, wherein a switch is provided at least at one position to detect a rotational displacement of the armature.