JPH0511387Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a negative actuation type electromagnetic brake that releases the braking of the shaft rotation when the electromagnetic coil is energized and brakes the shaft rotation when the electromagnetic coil is de-energized. This invention relates to a brake release device that releases the brake.

[Conventional technology]

Electromagnetic brakes are broadly classified into positive-acting type and negative-acting type, depending on whether the shaft rotation is braked or released when the electromagnetic coil is excited. Of these, negative-acting electromagnetic brakes are generally classified into the following types: It is configured as follows. In other words, this type of negative action electromagnetic brake is equipped with an annular yoke that is fixed to the equipment fixing part and has an electromagnetic coil inside, and a side plate is connected to the yoke on the magnetic attraction surface side of this yoke. They are fixed concentrically at predetermined intervals. In the space between the yoke and the side plate, an annular armature is provided so as to be slidable but non-rotatable with its plane facing the magnetic attraction surface of the yoke. An integrated disk is interposed between the device fixing portion and the disk so as to be slidable in the rotational direction via a shaft and a hub rotatably supported by the device fixing portion. Friction plates are attached to both sides of this disk, each facing the plane of the armature and side plate, and on the yoke side, elastic force is applied in the direction of separating the armature from the magnetic attraction surface. A damping spring is provided.

With this configuration, when the electromagnetic coil is excited and the armature is attracted to the magnetic adsorption surface of the yoke against the elastic force of the brake spring, the friction plates on both sides of the disk are released from pressure. The shaft integrated with the disc in the direction of rotation becomes unbraked, and when driven, it rotates.

When the drive of the shaft is released from this state and the electromagnetic coil is demagnetized, the armature is separated from the adsorption surface of the yoke by the elastic force of the braking spring, the disk moves, and the friction plates on both sides engage the armature and side plate. Since the disc is held between the discs, the rotation of the disc is braked, and the shaft integral with the disc is braked in the direction of rotation.

In such a negative actuation type electromagnetic brake, when the shaft is being braked, there are cases where it is desired to release the brake without exciting the electromagnetic coil. A brake release device has been proposed.
This device consists of a pair of pins that are rotatably supported at positions that bisect the outer periphery of the yoke in the circumferential direction, and whose tips have a D-shaped cross section that engages with the outer periphery of the armature. U with both legs fixed to pins
When the pin is rotated approximately 90 degrees by rotating the handle during braking, the D-shaped tip of the pin, whose plane was facing the outer periphery of the armature, will open. Since the arcuate surfaces of the cross-sectional portions face each other, the armature is pushed against the elastic force of the brake spring, and both surfaces of the disk are released from being clamped, thereby releasing the brake. When the handle is rotated from this state to its original position, the notch at the tip of the pin faces the outer periphery of the armature and moves with the elastic force of the braking spring, so both sides of the disc are held between the armature and the side plate. and the brake is activated again.

[The problem that the idea attempts to solve]

However, such a conventional brake release device for a negative actuating electromagnetic brake cannot be used if the armature is moved by the above-mentioned handle operation and the rotation of the shaft is in the brake release state, and then the shaft is accidentally started, for example by starting the motor. In this case, even if the motor is stopped in an emergency, the electromagnetic brake will not operate and the shaft will not be braked, which could lead to an unexpected accident.

[Means to solve the problem]

In order to solve these problems, this invention
The handle, whose swinging end is brought into contact with the flat surface of the armature on the opposite side of the armature, is pivoted to the side plate side, and the flat surface is opposed to the magnetic adsorption surface on the opposite side of the armature of the yoke. The reset armature is swingably supported in the space on the opposite side of the armature, and a reset pin is fixed to the reset armature so that its tip abuts against the handle.

[Operation] If you turn the handle while braking,
At its swinging end, the armature is pushed away from the friction surface of the disk, and at the same time the shaft is released from braking, the reset armature is pushed by the reset pin and tilts.

If you accidentally rotate the shaft while the brake is released and the electromagnetic coil is energized, the armature will be in the suction position and the brake will be released, and the reset armature will be suctioned and removed. The armature can be moved by rotating the handle using the integrated reset pin, so if the shaft is subsequently de-energized and the electromagnetic coil is de-energized in an emergency, the armature will move and the shaft will be braked. It is safe.

〔Example〕

1 to 5 show embodiments of a brake release device for a negative actuation type electromagnetic brake according to the present invention, and
The figure is a vertical cross-sectional view of a negative-actuation type electromagnetic brake that has implemented this, Figure 2 is a front view of the same, Figure 3 is a vertical cross-section of the upper half of the negative-actuation type electromagnetic brake shown in the brake release state, and Figure 4 is a vertical cross-sectional view of the upper half of the negative-actuation type electromagnetic brake. Fig. 2 is a side view, Fig. 5 is a 2nd side view.
It is an enlarged sectional view of the figure. This embodiment shows an example in which the present invention is applied to a negative actuation type electromagnetic brake for braking a motor shaft. 3 is fixed, and in an annular groove 3a formed in this yoke 3, an electromagnetic coil 4 formed in an annular shape and connected to a power source by a lead wire is fixed with an insulating resin 5 and housed.
6 is a side plate formed in a disc shape and fixed to the end face of the yoke 3 with a plurality of bolts 7,
A predetermined space is formed between the side plate 6 and the yoke 3 by interposing a collar 8 on the bolt 7 which serves as a guide member for the armature 9, which will be described later, between the yoke 3 and the side plate 6. This side plate 6 has a plane parallel to the magnetic attraction surface 3b of the yoke 3. An annular armature 9 is interposed in the space between the side plate 6 and the yoke 3, with its plane facing the magnetic attraction surface 3b, and a plurality of U provided on the outer periphery thereof.
By engaging the groove with the collar 8,
Rotation is restricted and sliding is guided.

On the other hand, the bearing on the housing 1 side has a shaft 10.
is rotatably supported, and a hub 11 is fixed to the tip of the shaft 10 with a key 12.
Reference numeral 13 denotes a disc formed in a circular shape and interposed between the armature 9 and the side plate 6, and is spline-fitted with the hub 11 to restrict mutual rotation with the hub 11 and to axially rotate the disc 13. It is formed to be slidable, and annular friction plates 14 and 15 are attached to both sides thereof. 1
A brake spring 6 is loaded into a plurality of spring holes provided in the yoke 3 and biases the armature 9 in a direction to separate it from the magnetic attraction surface 3b.

A pair of support plates 17 are provided to protrude outward from the edges of the chamfered portion 6a formed on both sides of the side plate 6.
A support pin 18 is rotatably supported. 19
is an arm formed in a semicircular arc shape from a plate material, and has both ends fixed to the chamfered part of the support pin 18, and the threaded part of the handle 20 is screwed into the threaded hole at the top of the arm. 21 is a snap spring for preventing the arm 19 from coming off. With this configuration, by gripping and rotating the handle 20, the arm 19 and the support pin 18 can be moved.
and rotate as one. A lever 22 is fixed to the outer end of the support pin 18 in the form of a tongue as shown in the front view in FIG.
The circular arc portion 2 at the tip which is the swinging end due to the rotation operation of
2a is connected to the armature 9 through a crescent-shaped space formed near the chamfered portion 6a of the side plate 6.
is in contact with the plane of And handle 20
When the lever 22 is rotated from the solid line position to the chain line position in the figure, the tip arc portion 22a of the lever 22 moves toward the armature 9.
is configured to move in a direction away from the friction plate 14 against the elastic force of the brake spring 16. Further, a torsion coil spring 23 is fitted onto the support pin 18 with hook portions at both ends fixed to the support plate 17 and the arm 19, and the handle 2
0 and the arm 19 are connected to this torsion coil spring 23.
As a result, the armature 9 is biased toward the pressure release side shown by the solid line in the figure. Further, an L-shaped arm stopper 24 is screwed onto the outer surface of the side plate 6. and the locking part 24a
By holding the arm 19 in the position indicated by the solid line in FIG. 5, the arm 19 elastically deforms the arm stopper 24 while overcoming the locking part 24a and maintains the tilted position. It is composed of

On the other hand, in the space of the yoke 3 on the side opposite to the armature 9, a reset armature 25 is supported by a fulcrum 3c on the yoke 3 side and is swingably provided. By energizing the yoke 3, it is configured to be attracted to the magnetic attraction surface 3d of the yoke 3 on the side opposite to the armature 9. Furthermore, reset armature 2
At the free end of 5, there is a reset pin 2 perpendicular to the free end.
6 is implanted through holes in the yoke 3 and the side plate 6, and its tip abuts against the handle 20. By doing this, handle 2
0 from the tilted position to the standing position, the reset pin 26 is pushed and the reset armature 2
5 is tilted, and when the reset armature 25 is attracted from this state and stands upright, the reset pin 26 pushes the handle 20 and the arm 19 gets over the locking part 24a of the arm stopper 24, so the elastic force of the torsion coil spring 23 The handle 20 is configured to tilt. Reference numeral 27 denotes a clinic mechanism for locking the reset armature 25 in a tilted position, and the recessed hole 25 of the reset armature 25
A ball 27a that engages with a, and this ball 27a
The ball 27 is interposed between the set screw 27b and the set screw 27b.
A compression coil spring 27 that urges a toward the recessed hole 25a.
It is composed of c.

The operation of the negative action type electromagnetic brake configured as above will be explained. When the electromagnetic coil 4 is excited in the state shown in FIG. The friction plates 14 and 15 on both sides of the disk 13 are released from pressure and the disk 13 becomes rotatable. It rotates with 13.

When the drive of the shaft support 10 is released from this state and the electromagnetic coil 4 is demagnetized, the armature 9 is separated from the magnetic attraction surface 3b of the yoke 3 by the elastic force of the braking spring 16, and the disk 13 is moved. Since the friction plates 14 and 15 on both sides are pressed against each other, the rotation of the disk 13 is braked, the hub 11 is stopped, and the shaft 10 is also stopped.

When the rotation of the shaft 10 is braked in this manner, if you want to manually release the brake on the shaft 10, hold the handle 20 and hold it upright as shown in FIG. Then, the reset armature 25, which is integrated with the reset armature 25, is tilted.
At the same time, the tip arc portion 22a of the lever 22 pushes the armature 9 toward the magnetic attraction surface 3b as shown by the chain line in FIG. The brake on the shaft 10 is released. In this case, the spring force of the torsion coil spring 23 acts in the direction of tilting the handle 20, but the arm 19
Since rotation is restricted by the locking, the handle 20 does not tilt due to the elastic force of the torsion coil spring 23.

When braking the shaft 10 again from this state,
When the handle 20 is grasped and tilted, the lever 2
2 releases the armature 9 from the pressure, the armature 9 moves by the elastic force of the braking spring 16 and clamps the friction plates 14, 15 between it and the side plate 6, and the shaft 10 is braked. In this case, the reset armature 25 remains tilted, but there is no problem since it will stand up with the next suction.

Next, a case will be described in which the user forgets to tilt the handle 20 and rotates the shaft 10 while keeping it upright. In this case, when the electromagnetic coil 4 is excited at the same time as the shaft 10 is driven, the armature 9 is attracted to the magnetic attraction surface 3b and at the same time the reset armature 25 is attracted to the magnetic attraction surface 3d. An integrated reset pin 26 is connected to the handle 2.
Press 0. As a result, the arm 19 rotates and elastically deforms the arm stopper 24 while the locking portion 24
a and is released, and at this time, the elastic force of the torsion coil spring 23 acts, so the handle 20 and the arm 19 are tilted, and the armature 9 is released from the pressure.In this way, the armature 9 is movable, but since it is attracted to the magnetic attraction surface 3b, the shaft 10 is not braked.

In this state, for example, when an emergency situation occurs and the drive of the shaft 10 is released and the excitation of the electromagnetic coil 4 is released, the armature 9 is separated from the magnetic attraction surface 3b by the elastic force of the braking spring 16. Since the pressure on the armature 9 is released, the armature 9 moves without any trouble and the shaft 10 is braked, so no accidents occur.

[Effect of idea]

As is clear from the above explanation, according to the present invention, in a negative actuating electromagnetic brake, the handle whose swinging end is brought into contact with the flat surface of the armature on the side opposite to the yoke is pivotally supported on the side plate side. A reset armature with a flat surface facing the opposite armature magnetic attraction surface of the yoke is swingably supported in the space on the opposite armature side of the yoke, and a reset pin is fixed to this reset armature and its tip is attached to a handle. When the handle is rotated while the shaft is being braked, the swinging end of the handle presses the armature and moves it, releasing the brake on the shaft, so it functions as a brake release device. Secured. Even if you accidentally turn the shaft with the handle that should be returned to the braking position in the brake release position and then urgently release the shaft drive, the reset armature can be reset by excitation of the electromagnetic coil while the shaft is being driven. When the armature is attracted, the reset pin pushes the handle, making the armature movable. When the electromagnetic coil is demagnetized, the armature moves and brakes the shaft via the disk, which prevents accidents caused by the shaft not being braked. It is possible to prevent this from occurring and improve safety.

[Brief explanation of drawings]

1 to 5 show an embodiment of the brake release device for a negative action type electromagnetic brake according to the present invention. Similarly, FIG. 3 is a longitudinal sectional view of the upper half of the negatively operated electromagnetic brake shown in the brake release state, FIG. 4 is a side view of FIG. 2, and FIG. 5 is an enlarged sectional view of FIG. 2. It is. 2... Negative action type electromagnetic brake, 3... Yoke,
3a, 3d...magnetic adsorption surface, 4...electromagnetic coil,
6... Side plate, 9... Armature, 1
0... Axis, 13... Disk, 14, 15... Friction plate, 16... Braking spring, 19... Arm, 20
...Handle, 22...Lever, 25...Reset armature, 26...Reset pin.

Claims (1)

[Scope of utility model registration request] The armature is attracted against the elastic force of the braking spring by the excitation of the electromagnetic coil installed inside the yoke.
In this negative actuation type electromagnetic brake, which releases the disk from being held between the armature and the side plate to release the braking of the shaft, the end that is pivoted on the side plate side and swings when rotated is moved to the side opposite to the yoke of the armature. a handle in contact with a flat surface; a reset armature that is swingably supported in a space on the opposite armature side of the yoke and has a flat surface facing a magnetic attraction surface on the opposite armature side of the yoke; A brake release device for a negative actuation type electromagnetic brake, characterized in that a reset pin is fixed and has its tip abutted against the handle.