JP2023008189A - Mechanical latch device of electromagnetic contactor - Google Patents

Abstract

To provide a mechanical latch device of an electromagnetic contactor, which reduce an operation for adjusting a gap of a part where a returning of a latch support is mechanically prevented, to improve convenience.SOLUTION: Each fixing dowels 23 is fixed with respect to one fixing position selected out of a plurality of fixing positions along a displacement direction of a latch support 22. A linkage mechanism 24 includes: a linkage 61 arranged on a release side; and a linkage 62 arranged on a charge side. The charge side of the linkage 61 and the release side of the linkage 62 are rotatably connected. The release side of the linkage 61 is rotatably connected to the fixing dowels 23, and the charge side of the linkage 62 is rotatably connected to the latch support 22. A connection point on the release side in the linkage 61 and the connection point on the charge side in the linkage 62 are arranged along the displacement direction.SELECTED DRAWING: Figure 4

Description

The present invention relates to a mechanical latch device for an electromagnetic contactor.

For circuits where you don't want the magnetic contactor to shut off due to power outages or voltage drops, or when you want to reduce the power consumption of constant energization, mechanical retention of the magnetic contactor's closed state is required. A device is attached to the magnetic contactor. In the mechanical latch device disclosed in Patent Document 1, when the latch support is displaced to the closing side in conjunction with the contact support, the roller of the latch lever is hooked on the shoulder of the latch support so that the latch support moves to the release side. It mechanically prevents them from returning.

JP-A-2000-251601

When the control coil of the magnetic contactor is energized, there is a slight gap (play) between the shoulder of the latch support and the roller. , even in the case of the same model, the size of the gap also varies due to individual differences. When the control coil of the electromagnetic contactor is de-energized, the latch support returns by the amount of the gap, so depending on the size of the gap, it was necessary to adjust the gap by replacing the roller with a roller with a different outer diameter. .
SUMMARY OF THE INVENTION It is an object of the present invention to provide a mechanical latch device for an electromagnetic contactor, in which adjustment work for mechanically preventing the latch support from returning is reduced and convenience is improved.

A mechanical latch device for an electromagnetic contactor according to one aspect of the present invention includes a latch support that is connected to a contact support of the electromagnetic contactor and is displaceable between a release side and a closing side, and a It has a fixed piece fixed by selecting any one from a plurality of fixed positions, a first link arranged on the release side and a second link arranged on the closing side, and the first link The input side and the release side of the second link are rotatably connected, the release side of the first link is rotatably connected to the fixed piece, and the input side of the second link is rotatably connected to the latch support. , the connection point on the release side of the first link and the connection point on the closing side of the second link are arranged along the displacement direction, and when the latch support is on the release side, the first link and the second link The angle formed by the minor angle allows the latch support to be displaced to the closing side, and when the latch support is on the closing side, the angle formed by the first link and the second link becomes a flat angle. , and a link mechanism that mechanically prevents the latch support from returning to the release side.

According to the present invention, when the latch support is on the closing side, the angle formed by the first link and the second link is a flat angle, thereby mechanically preventing the latch support from returning to the releasing side. The adjustment work for the part that mechanically prevents the return of the latch support can be done simply by switching the fixing position of the fixed piece, so that the adjustment work can be reduced and the convenience can be improved.

It is a figure which shows the mechanical latch apparatus of an electromagnetic contactor. FIG. 11 shows a latch support; It is a figure which shows a fixed piece. It is a figure which shows the state which the link mechanism is bent. It is a figure which shows the state which the link mechanism is extending|stretching. It is a figure which shows a comparative example.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. Note that each drawing is schematic and may differ from the actual one. Moreover, the following embodiments are intended to exemplify devices and methods for embodying the technical idea of the present invention, and are not intended to limit the configurations to those described below. That is, the technical idea of the present invention can be modified in various ways within the technical scope described in the claims.

<<One Embodiment>>
"Constitution"
In the following description, the three mutually orthogonal directions are referred to as the vertical direction, the width direction, and the depth direction for convenience. The front side in the depth direction corresponds to the release side in the displacement direction, and the back side in the depth direction corresponds to the closing side in the displacement direction.
FIG. 1 is a diagram showing a mechanical latch device for an electromagnetic contactor.
For circuits where the electromagnetic contactor 11 should not be cut off due to power outages or voltage drops, or where it is desired to reduce the power consumption of constant energization, it is required to mechanically maintain the closed state of the electromagnetic contactor 11. A mechanical latch device 12 is attached to the magnetic contactor 11 . Here, part of the electromagnetic contactor 11 is virtually indicated by a two-dot chain line, and detailed description is omitted.

The mechanical latch device 12 will now be described. Here, the structure viewed from one side in the vertical direction is shown, and the illustration of the contact portion is omitted for the sake of simplicity of explanation. The mechanical latch device 12 includes a case 21 , a latch support 22 , a fixed piece 23 , a link mechanism 24 , an electromagnet 25 and a plunger 26 .
The case 21 has a substantially rectangular parallelepiped outer shape and is attached to the front side of the electromagnetic contactor 11 in the depth direction.
The latch support 22 is arranged substantially in the center in the width direction within the case 21, and the far side in the depth direction protrudes from the opening 13 of the case 21, and is connected to the contact support 14 of the electromagnetic contactor 11, so that it is connected to the release side. It is displaceable between the injection side. Here, a part of the contact support 14 is virtually indicated by a chain double-dashed line, and detailed description is omitted.

FIG. 2 is a diagram showing a latch support.
The latch support 22 includes a base 31 , leg portions 32 , support portions 33 and a-contact portions 34 .
The base 31 has a substantially plate-like shape along the displacement direction and the vertical direction, and a through hole 41 extending along the displacement direction and penetrating in the width direction is formed at substantially the center in the vertical direction.
The leg portion 32 is provided on the input side of the base 31 and extends along the input side. A concave groove 42 is formed along the vertical direction at the end of the leg 32 on the insertion side. The concave groove 42 is formed in a substantially T shape when viewed from the vertical direction, with the release side extending to both sides in the width direction. By fitting the concave groove 42 to the contact support 14 of the electromagnetic contactor 11 along the vertical direction (see FIG. 1), the latch support 22 interlocks with the contact support 14 and moves between the release side and the closing side. can be displaced by

The support portions 33 are formed on one side of the base 31 in the width direction and on both sides in the vertical direction so as to sandwich the through-hole 41 . It has a flat plate shape. A vertically extending cylindrical support shaft 43 is inserted through and fixed to the pair of support portions 33 .
The a-contact portion 34 has a substantially square cylindrical shape penetrating in the width direction, is formed on the other side of the base 31 in the width direction and on the release side of the through hole 41, and elastically supports a movable contact (not shown). The a-contact portion 34 separates the movable contact from the fixed contact (not shown) when the latch support 22 is on the released side, and brings the movable contact into contact with the fixed contact when the latch support 22 is on the closing side. Let

FIG. 3 is a diagram showing a fixed piece.
(a) in the figure shows a pair of fixed pieces 23 , and (b) in the figure shows the fixed pieces 23 fixed to the case 21 . The pair of fixed pieces 23 are provided on both sides in the vertical direction, and are connected to each other by fitting a columnar support shaft 51 extending in the vertical direction. The fixed piece 23 has a substantially rectangular parallelepiped shape, and one projection 52 extending in the vertical direction is formed on each side surface in the width direction. The protrusion 52 is formed to be convex outward in the width direction, the front side in the depth direction is formed to be a plane along the longitudinal direction and the width direction, and the back side in the depth direction is directed outward in the width direction. It is formed so as to incline toward the near side in the depth direction as much as possible.

The case 21 is formed with a recess 53 extending in the depth direction and into which the fixed piece 23 is fitted from the inside in the vertical direction. A plurality of pairs of grooves 54 that engage with the protrusions 52 are formed along the depth direction on both sides in the width direction of the inner peripheral surface of the recess 53 . The groove 54 is concave outward in the width direction, the front side in the depth direction is formed to be a plane along the longitudinal direction and the width direction, and the back side in the depth direction is directed outward in the width direction. It is formed so as to incline toward the near side in the depth direction as much as possible. Here, four pairs of grooves 54 are formed along the depth direction at intervals of about 0.5 mm, for example. The fixed piece 23 is fitted into one of the paired grooves 54 to determine the fixed position along the depth direction.

As shown in FIG. 1, the link mechanism 24 has a link 61 (first link) and a link 62 (second link). The link 61 is a substantially rectangular parallelepiped that extends linearly and is arranged on the front side in the depth direction, and the link 62 is a substantially rectangular parallelepiped that extends linearly and is arranged on the far side in the depth direction. The back side of the link 61 in the depth direction and the front side of the link 62 in the depth direction are rotatably connected by a support shaft 63, and the position of the support shaft 63 is not fixed. The front side of the link 61 in the depth direction is rotatably connected by a support shaft 51 , and the position of the support shaft 51 is fixed by a fixed piece 23 . The back side of the link 62 in the depth direction is rotatably connected to the support portion 33 by a support shaft 43, and the support shaft 43 is constrained so as to reciprocate linearly along the displacement direction of the latch support 22. . When viewed from the vertical direction, the support shaft 51 and the support shaft 43 are arranged on a straight line along the depth direction. The latch support 22, fixed piece 23, and link mechanism 24 constitute a toggle mechanism.

As shown in FIG. 1 , the electromagnet 25 is arranged on the other side in the width direction of the latch support 22 within the case 21 . Here, the electromagnet 25 is imaginarily indicated by a chain double-dashed line, and although detailed description is omitted, it includes a spool, control coil, yoke, and return spring (not shown). When the control coil is energized and energized, the plunger 26 is advanced to one side in the width direction against the elastic force of the return spring. A spring retracts the plunger 26 to the other widthwise side.
The plunger 26 is a yoke inserted into the spool of the electromagnet 25, and has a cylindrical projecting rod 28 projecting to one side in the width direction. The protruding rod 28 protrudes through the through hole 41 of the latch support 22 to one side in the width direction, and has a hemispherical tip.

"motion"
Next, main operations of one embodiment will be described.
FIG. 4 is a diagram showing a state in which the link mechanism is bent.
Here, the latch support 22 is on the release side in conjunction with the contact support 14, the link mechanism 24 is bent in a substantially "<" shape when viewed from the vertical direction, and the angle θ formed by the links 61 and 62 is inferior. It becomes an angle (0°<θ<180°). At this time, the latch support 22 is allowed to be displaced to the closing side.

FIG. 5 is a diagram showing a state in which the link mechanism is extended.
Here, the latch support 22 is interlocked with the contact support 14 on the closed side, the link mechanism 24 extends in a straight line when viewed from the vertical direction, and the angle θ between the links 61 and 62 is a flat angle (θ=0 °). At this time, the links 61 and 62 are stretched to mechanically prevent the latch support 22 from returning to the release side.
To release the latched state that mechanically prevents the return of the latch support 22 to the release side, the plunger 26 is advanced to one side in the width direction by the electromagnet 25 at the time of closing. As a result, the protruding rod 28 pushes the link 62 and bends the link mechanism 24 into a substantially "<" shape. In this manner, the angle θ between the links 61 and 62 returns to the minor angle, so that the latch support 22 is released from the latched state.

《Action》
Next, main effects of one embodiment will be described.
Since the stroke amount of the contact support 14 differs depending on the model of the electromagnetic contactor 11, in the conventional structure, it was necessary to adjust the clearance of the portion that mechanically prevents the return of the latch support.
Therefore, the mechanical latch device 12 of the electromagnetic contactor 11 in one embodiment includes a latch support 22, a fixed piece 23, and a link mechanism 24. The latch support 22 is connected to the contact support 14 of the electromagnetic contactor 11 and is displaceable between the release side and the closing side. The fixed piece 23 is fixed by selecting one of a plurality of fixed positions along the displacement direction of the latch support 22 . The link mechanism 24 has a link 61 arranged on the releasing side and a link 62 arranged on the closing side. The closing side of the link 61 and the releasing side of the link 62 are rotatably connected, the releasing side of the link 61 is rotatably connected to the fixed piece 23, and the closing side of the link 62 is rotatably connected to the latch support 22. be. A connection point on the release side of the link 61 and a connection point on the closing side of the link 62 are arranged along the displacement direction. When the latch support 22 is on the release side, the angle θ formed by the link 61 and the link 62 is a minor angle, thereby allowing the latch support 22 to be displaced to the closing side. When the latch support 22 is on the closing side, the angle θ formed by the link 61 and the link 62 is a flat angle, thereby mechanically preventing the latch support 22 from returning to the releasing side. As a result, the adjustment work for the portion that mechanically prevents the return of the latch support 22 can be achieved simply by switching the fixed position of the fixed piece 23, so that the adjustment work can be reduced and the convenience can be improved. Moreover, the gap in the portion that mechanically prevents the return of the latch support 22 can be made zero.

The mechanical latch device 12 of the electromagnetic contactor 11 has a case 21 . Case 21 accommodates latch support 22 , fixed piece 23 , and link mechanism 24 . The case 21 is formed with a concave portion 53 extending along the displacement direction and into which the fixed piece 23 is fitted. A plurality of grooves 54 that engage with the protrusions 52 are formed along the displacement direction on the inner peripheral surface. As a result, the fixed position of the fixed piece 23 can be easily switched, and the fixed piece 23 can be positioned automatically, although the stroke amount of the contact support differs depending on the model of the electromagnetic contactor and individual differences even in the case of the same model. Therefore, no adjustment is required. Since the protrusion 52 has an asymmetrical shape when it is reversed in the depth direction when viewed from the vertical direction, when fitting the pair of fixed pieces 23 into the recess 53, the direction of the depth direction is alternately assembled. can be prevented. The projection 52 is formed so that the front side in the depth direction is a plane along the longitudinal direction and the width direction, and the groove 54 is formed so that the front side in the depth direction is a plane along the longitudinal direction and the width direction. is formed in Therefore, the groove 54 can support the force of the latch support 22 directed toward the release side on the orthogonal plane.
Alternatively, the protrusions 52 may be formed on the case 21 side and the plurality of grooves 54 may be formed on the fixed piece 23 side. Also, in the present embodiment, a plurality of grooves 54 are provided for one protrusion 52 , but a plurality of protrusions 52 may be provided for one groove 54 .

The mechanical latch device 12 of the electromagnetic contactor 11 has a plunger 26 . The plunger 26 is driven by the electromagnet 25 and pushes the link 62 with its tip when advancing toward the link 62 from the side of the latch support 22, thereby changing the angle θ formed by the link 61 and the link 62 from a flat angle to a minor angle. return. Thereby, the latched state of the latch support 22 can be easily released. When the link mechanism 24 extends in a straight line and the angle θ formed by the links 61 and 62 is a flat angle, the link mechanism 24 can be bent with a relatively small force toward one side in the width direction. Therefore, it is possible to suppress the electromagnet 25 and the plunger 26 from increasing in size.

Next, a comparative example will be described.
FIG. 6 is a diagram showing a comparative example.
(a) in the figure is a view seen from one side in the vertical direction. In the figure, the latch support 71 has a shoulder 72 and the latch lever 73 has a roller 74 . In the comparative example, when the latch support 71 is displaced to the closing side, the roller 74 of the latch lever 73 is hooked on the shoulder 72 of the latch support 71, thereby mechanically preventing the latch support 71 from returning to the release side. Was. (b) in the drawing is an enlarged view of a portion that mechanically prevents the latch support 71 from returning. When the control coil of the electromagnetic contactor 11 is excited, a slight gap d (play) is provided between the shoulder portion 72 and the roller 74, but the stroke amount of the contact support 14 is equal to that of the electromagnetic contactor 11. , the size of the gap d also differs depending on the model. When the control coil of the electromagnetic contactor 11 is de-energized, the latch support 71 returns by the amount of the gap d. I needed work.

<<Modification>>
In one embodiment, the configuration in which the plunger 26 pushes the link 62 when releasing the latched state has been described, but the present invention is not limited to this. In other words, the latch state may be released by pushing the link 61 with the plunger 26 .
In one embodiment, only the configuration in which the plunger 26 pushes the link 62 has been described as means for releasing the latched state, but it is not limited to this. In addition, a manual operation unit may be provided that can release the latched state by pushing or pulling the link 61 or the link 62 in one of the width directions when operated by the user.
In one embodiment, a configuration has been described in which any one of the four fixed positions of the fixed piece 23 can be selected, but the present invention is not limited to this. Therefore, the configuration may be such that any one of two, three, or five or more fixing positions can be selected.

Although the foregoing has been described with reference to a limited number of embodiments, the scope of rights is not limited thereto, and modifications of the embodiments based on the above disclosure will be obvious to those skilled in the art.

DESCRIPTION OF SYMBOLS 11... Electromagnetic contactor, 12... Mechanical latch device, 13... Opening, 14... Contact support, 21... Case, 22... Latch support, 23... Fixed piece, 24... Link mechanism, 25... Electromagnet, 26... Plunger, 28 Protruding rod 31 Base 32 Leg 33 Support 34 Contact point 41 Through hole 42 Groove 43 Spindle 51 Spindle 52 Projection 53 Recess 54 Groove 61 Link 62 Link 63 Spindle 71 Latch support 72 Shoulder 73 Latch lever 74 Roller θ Angle d Gap

Claims (3)

a latch support connected to the contact support of the magnetic contactor and displaceable between the release side and the closing side;
a fixed piece selected and fixed from a plurality of fixed positions along the displacement direction of the latch support;
a first link arranged on the releasing side and a second link arranged on the closing side, wherein the closing side of the first link and the releasing side of the second link are rotatably connected; The release side of the first link is rotatably connected to the fixed piece, the input side of the second link is rotatably connected to the latch support, and the connection point of the release side of the first link and the When the connecting point of the closing side of the second link is arranged along the displacement direction and the latch support is on the releasing side, the angle formed by the first link and the second link is a minor angle. The latch support is allowed to be displaced to the closing side, and when the latch support is on the closing side, the angle formed by the first link and the second link becomes a flat angle, so that the latch support A mechanical latch device for an electromagnetic contactor, comprising: a link mechanism for mechanically preventing the return of the magnetic contactor to the release side. A case that accommodates the latch support, the fixed piece, and the link mechanism,
The case is formed with a concave portion extending along the displacement direction and into which the fixed piece is fitted,
A protrusion is formed on a side surface of the fixed piece,
2. The electromagnetic contactor according to claim 1, wherein the inner peripheral surface of the recess facing the side surface of the fixed piece is formed with a plurality of grooves that engage with the projection along the displacement direction. Mechanical latching device. By pushing the first link or the second link with the tip when moving forward from the side of the latch support toward the first link or the second link, the second link is driven by an electromagnet. 3. The mechanical latch device for an electromagnetic contactor according to claim 1, further comprising a plunger for returning the angle formed by the one link and the second link from a flat angle to a minor angle.

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