JP2645140B2 - Operation display of electromagnetic contactor - Google Patents

Description

The present invention relates to an electromagnetic contactor and a device for preventing an erroneous operation of a manual operation unit and an operation of displaying an open / closed state of an open / close device that can be operated by electric power and manually operated. The present invention relates to a device for preventing misidentification of a display unit.

[Conventional technology]

In the prior art, checking whether a circuit via the contacts of an electromagnetic contactor is correctly configured (hereinafter referred to as a sequence check) is performed without driving an electromagnet of the electromagnetic contactor by using a fixed insulating stand or an insulating stand cover (hereinafter referred to as an external stand). Call
And is configured to press a part of a movable insulating table to which a movable contact is attached from the opening,
In order to visually check the operation state of the electromagnetic contactor, a part of the movable insulating table or an operation display unit interlocked with the movable insulating table is penetrated into the opening to visually observe the movement.

The pressing part is placed at the approximate center of the movable insulating base so that the movable part can move in parallel to satisfy the sequence check function by allowing the multiple contacts mounted on the movable insulating base to make correct contact, and that part is the above operation display Function is also used. FIGS. 24 and 25 show a conventional example of an electromagnetic contactor having such a configuration, 11 is a fixed insulating stand, 12 is an insulating stand cover, 12a is an opening thereof, 13 is a movable insulating stand, 13a
Is the pressing portion.

Examples of optically displaying the operation state are disclosed in Japanese Patent Application Laid-Open No. Sho 59-141138 and Japanese Utility Model Publication No. Sho 52-15232.

[Problems to be solved by the invention]

The prior art configured as described above has the following problems.

a.Pressing part 13a of movable insulating stand 13 even after sequence check
Is in a state where it can be pressed at any time while being exposed, and there is a risk that an accident may occur if the pressing portion 13a is erroneously pressed when the equipment including the electric circuit including the electromagnetic contactor is in an operable state.

b. Since a part of the jacket is open so that a part of the movable insulating table 13 can be pressed, the pressure generated by the arc at the time of current interruption is released from the opening 12a, and the pressure in the arc extinguishing chamber does not increase. The blocking performance is reduced. For this reason, it is necessary to enhance the arc extinguishing ability, which has been a hindrance in improving economical efficiency and miniaturization and high performance.

c. Since a guide for restricting the movement of the movable insulating table 13 is provided near the opening 12a, the periphery of the opening 12a is stained with wear powder due to the repetitive operation, and is located on the outer cover on the same plane as the opening 12a. In some cases, wear powder adhered to the nameplate, making it difficult to read the description. On the other hand, the opening 12a serves as a foreign substance entry port, causing problems such as poor contact of the contact and obstruction of the movement of the movable part.

d.Because the operating state is recognized based on the difference in the position of the movable part on the front side or the back side of the opening 12a,
The identification from the side is relatively good, but the control panel is equipped with electromagnetic contactors and other devices of different sizes,
Although it was difficult to confirm the operation state from the side, it was difficult to discriminate it from the front, and it did not respond immediately to the actual use.

e. The technique disclosed in JP-A-59-141138 has a display window 14 utilizing a reflecting prism 17 as shown in FIG. 26, but the opening of the display window 14 is impossible. In order to selectively block unexpected information, measures must be taken to prevent light from transmitting through the conical reflecting surface, for example, by vapor-depositing aluminum, which is also problematic in terms of economy.
In the figure, 15 and 16 are markers. The contents disclosed in Japanese Utility Model Publication No. 52-15232 also show a similar display technique using reflected light.

In view of the above problems, the present invention has a main purpose of adding safety to ease of handling, and further eliminates dirt due to abrasion powder in the vicinity of an opening of a jacket, prevents intrusion of foreign matter, improves blocking performance, and An object of the present invention is to provide a novel operation display device of an electromagnetic contactor for preventing an erroneous recognition of an operation state.

[Means for solving the problem]

In order to achieve the above object, the present invention covers an opening of a jacket on which a movable insulating table is to be pressed by using a light-transmitting cover that can be opened / closed or removable as necessary, and as a display unit. A prism or lens is formed on the cover, and a mark is provided on the movable part side or the fixed side, or both, so that displacement position information corresponding to the movement of the movable part can be visually observed using the refracted light of the prism or lens. In order to prevent abrasion powder from adhering near the opening, a guide is provided at the back of the opening so that the movable part slides. And a sliding surface of the insulating wall facing the movable insulating table is disposed at a depth from the opening through the U-shaped path.

[Action]

With the above configuration, it is possible to perform a sequence check by opening or removing the opening cover, and by closing the sequence check, it is possible to prevent the pressing portion from being exposed. In addition to eliminating the risk of operation, the covering of the opening prevents pressure drop and foreign matter from entering the arc-extinguishing chamber at the time of current interruption, and eliminates poor contact at the contacts and tightness of the movable parts, improving the breaking performance of the electromagnetic contactor. Can bring good results. Further, the abrasion powder due to sliding does not adhere to the vicinity of the opening, and the operating state of the movable portion can be visually observed by the cover of the light transmitting body.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a front view of an embodiment of the operation display device for an electromagnetic contactor according to the present invention, and FIG. 2 is a partial side sectional view of the same. At the center of the fixed insulating table 1, there is an opening 2a facing the pressing portion 3a of the movable insulating table 3, and an opening cover 4 for opening and closing the opening 2a is provided. A sign 5 is provided at the tip of the pressing portion 3a.
Is provided. FIG. 2 shows a state where the opening cover 4 is opened. FIG. 4 is an exploded perspective view of the embodiment of the electromagnetic contactor according to the present invention in a non-excited state. As shown in FIG. 4, a groove for mounting the indicator 5 on the movable insulating table 3 is shown.
There is provided a projection 5a which is press-fitted into the groove 3a and latched at a predetermined center position. The first sign 5b is a sign 5
Is set on the inner surface of the cone. A marking body 6 is fitted on the insulating base cover 2, and a step 2 b is provided for engaging with a latching projection 6 a provided on the marking body 6. Further, the insulating base cover 2 has a stepped portion 2c which engages with the engaging portion 4c of the opening cover 4, a stepped portion 2e which engages the shoulder 4e of the elastic piece 4b, and the opening cover 4 has the engaging portion 4c.
3 (a) and 3 (b), the opening cover 4 is engaged with a drop-preventing piece 4d provided on the cover 4 so that the opening cover 4 does not fall off from the engaging portion 2c when the pivot is rotated as shown in FIGS. Protrusion 2d
Is provided. The opening cover 4 is formed of a light-transmissive transparent plastic, and has a matte finish to irregularly reflect light except for the conical portion 4f and the operation display surface 4a.
The mounting of the opening cover 4 on the insulating base cover 2 is performed in the direction of arrow A in FIG. 3A, and when the opening cover 4 is opened in the direction of arrow B shown in FIG. In the moving process, since the fall prevention piece 4d of the cover is engaged with the projection 2d, the opening cover cannot be removed except in the direction opposite to the direction of the arrow A shown in FIG. 3 (a).

FIG. 5 shows an embodiment of a guide for smoothly moving the movable insulating table 3 and preventing the abrasion powder from scattering. As shown in FIG. 5, the sliding between the movable insulating base 3 and the fixed insulating base 1 forms a U-shaped path separated by the insulating wall 1b of the fixed insulating base 1 communicating with the opening 2a. By forming a sliding portion S where the anti-center side surface and the insulating wall 1b face each other, and disposing this sliding portion S in a deep portion away from the opening 2a,
Care is taken to prevent wear powder from sliding out of the opening 2a to the outside.

The display mechanism of the operation display unit in the non-excited state of the electromagnetic contactor will be described with reference to FIG. The first marker 5b mounted on the inner surface of the sign 5 is set inside the second marker 6b set on the inner surface of the sign 6 and at a position surrounding the conical protrusion 4f of the opening cover 4. . In this state, the light shown by the solid line in FIG. 8 is reflected by the marker 5b and returns in the direction of the arrow shown by the broken line in FIG. At this time, if the sign 5b is colored green, the non-excitation state can be confirmed as green.

On the other hand, when the electromagnetic contactor is excited, as shown in FIG. 9, the indicator 5 moves away from the conical protrusion 4f of the opening cover 4, and the incident light indicated by the arrow in FIG.
It is reflected back at 6b. At this time, if the second marker 6b is colored red, the excitation state can be confirmed as red.

According to this embodiment, the opening cover 4 is the insulating base cover 2.
The opening cover 4 can be closed by a one-touch operation if the sequence check is completed without any loss at the time of the sequence check.

FIG. 11 is a diagram showing another embodiment in consideration of economy.
The sign 5 is formed integrally with the movable insulating table 3, and a green tape is attached to the sign 5 or colored green. FIG. 12 is a diagram showing an embodiment considering further economics,
FIG. 4 is an embodiment in which a projection having an isosceles triangular cross section is formed on the opening cover 4, which simplifies the structure of a mold for molding the movable insulating table 3, and has a tape-shaped first sign 5 b and a second sign 6 b. Is easy to mount. The enclosure described in claim 2 means the sign 5 in each of the above embodiments.

13 to 16 show another embodiment of the opening cover 4. FIG. The embodiment shown in FIGS. 13 (a), (b) and (c)
The mold structure for forming the engaging portion 4c which engages with the insulating base cover 2 and serves as a fulcrum of rotation and the step 4e for engaging the elastic piece 4b for engaging is simplified. 14 and 15 (a), (b) and FIG. 16, a tool is used to prevent the opening cover 4 from being opened carelessly. In this embodiment, safety is more important than handling.

17 to 22 show another embodiment for optically displaying operation.

FIG. 17 shows that the pressing portion 3a of the movable insulating table 3 is inclined toward the opening side of the fixed insulating table 1 and the insulating table cover 2, the inclined surface is concave, and a mirror surface is formed by aluminum evaporation or aluminum foil sticking. The first sign 5b is fitted to the opening cover 4 and the second sign 6b is fitted to the fixed insulating stand 1 and pressed and fixed by the insulating stand cover 2, and the first sign is placed in the non-excited state of the electromagnetic contactor. When the mirror 5b is reflected on the mirror surface and is excited, it is reflected on the surface of the second marker 6b so that the operating state can be viewed through the opening cover 4. By making the mirror surface concave, the sign is magnified as shown in FIG. 18 (magnification ratio l '/
l) Since the size of the sign itself is reduced as compared with a simple plane, the height of the product can be reduced and the viewing angle can be increased.

FIG. 19 shows that a mountain-shaped projection 4f 'having a triangular cross section is provided outside the opening cover 4 and the pressing portion 3a of the movable insulating table 3 is provided.
Is formed on a flat surface, and a tape is attached to the first marker 5b, and a tape is affixed on the second marker 6b as a flat surface, or both markers are colored by paint. This shows a state where the second marker 6b can be viewed when the contactor is excited. In this embodiment, the movable insulating base 4 and the signs 5b and 6b are simplified to improve the economy.

FIG. 21 is an embodiment diagram in which the outside of the opening cover 4 is formed into a frustoconical shape by applying the embodiment shown in FIG. 8, and the non-excited state can be visually observed from an oblique direction through the slope 4g. FIG. 22 shows that the central portion of the opening cover 4 on the side opposite to the conical projection 4f is formed in a caldera shape, and a convex portion having slopes 4h and 4g is formed outward, and the magnet is excited from an oblique direction of the slope 4h. 21 and 22 both aim at enlarging the sign display field of view.

FIG. 23 is an embodiment diagram in which the opening cover 4 is further extended to the terminal portion, whereby the terminal portion is covered, and electric shock can be prevented.

The indicating means for identifying the displacement operation position of the pressing portion described in the claims is not limited to the optical display presented in the embodiment, and induces a position change or a state change of at least a part of the opening cover. For example, it may be one that is linked with the opening mechanism of the opening cover.

〔The invention's effect〕

By implementing the present invention, the following effects can be obtained.

By covering the opening with a light-transmitting cover that can be opened and closed or detachable, it has the functions of sequence check and operation status display of the electromagnetic contactor, as well as ensuring the safety of the operator, and by covering the opening, The breaking performance is improved without strengthening the arc extinguishing device, and it is possible to achieve higher performance and smaller size. Furthermore, the intrusion of foreign matter can be prevented, and the reliability is significantly improved.

By providing a projection for transmitting and refracting a term on the cover to optically display the operation state, visual confirmation is extremely easy, and a remarkable effect that an operator's erroneous recognition can be prevented and safety can be ensured can be contributed. Is played.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of the operation display device for an electromagnetic contactor according to the present invention, and FIGS. 2 and 6 are partial cross-sectional views taken along the line BB of FIG. FIGS. 3 (a) and 3 (b) are diagrams showing the excitation state of the electromagnetic contactor, FIGS. 3 (a) and 3 (b) are explanatory views of the operation of FIG. 2, FIG. FIGS. 7 to 10 are partial cross-sectional side views for explaining the operation display mechanism in the embodiment shown in FIGS. 1, 2 and 6; FIG. , Eleventh
FIGS. 12 and 13 are perspective views showing another embodiment of the operation display unit of the present invention, and FIGS. 13 (a), (b) and (c) are perspective views of one embodiment of the opening cover and 14 to 16 are cross-sectional views of another embodiment of the opening cover, FIG. 17 is a cross-sectional view showing another embodiment of the operation display section, and FIG. 18 is a partially enlarged view of FIG. FIGS. 19 and 20 are explanatory views of another embodiment of the operation display section, FIGS. 21 and 22 are explanatory views of still another embodiment, and FIGS.
23 is a partial side sectional view showing an embodiment in which the opening cover is extended to the terminal portion, FIG. 24 is a front view of a conventional electromagnetic contactor, FIG. 25 is a partial partial sectional view of FIG. 24, FIG. The figure is a cross-sectional view for explaining the operation of the conventional display device. 1 ... fixed insulating table, 1b ... insulating wall 2 ... insulating table cover, 2a ... opening 3 ... movable insulating table, 3a ... pressing part 4 ... opening cover, 4f ... conical part 4f '... Yamagata projection, 5, 6 ... Sign 5b ... 1st sign, 6b ... 2nd sign

Claims (3)

(57) [Claims] 1. An operation display device for an electromagnetic contactor, comprising a fixed insulating table and a movable insulating table, for opening and closing a contact by a displacement operation of the movable insulating table, wherein at least a pressing portion for the displacement operation of the movable insulating table is provided. A light-transmitting opening cover that covers the facing opening and can be opened and closed with one end as a pivot point and the other end as a locking end, or detachable with at least one end as a locking end, A first marker provided at a distal end of the pressing portion, a second marker provided on the inner wall of the fixed insulating table or the opening cover and provided in a direction perpendicular to a displacement operation direction of the movable insulating table, A light-transmitting portion formed on the opening cover and configured to allow the first marker and the second marker to be selectively checked with a displacement operation of the pressing portion; Change position due to displacement movement of the part In addition to a display means for identification, an insulating wall is provided on the fixed insulating table facing the side wall of the pressing section of the movable insulating table, and a tip of the pressing section is displaced between the insulating walls. An operation display device for an electromagnetic contactor, wherein the operation display device is configured as described above. 2. A movable insulating table having a U-shaped path which is isolated by the insulating wall and communicates with the opening so as to prevent foreign matter from entering from outside and contamination of the display means by abrasion powder. 2. The operation display device for an electromagnetic contactor according to claim 1, wherein the sliding surface of the insulating wall is disposed at a depth from the opening through the U-shaped path. 3. The light-transmitting cone is provided inside the opening cover, has an axis in the axial direction of the movable insulating table, and has a vertex toward the inside of the opening cover. 3. The electromagnetic contactor according to claim 2, wherein the first sign is provided on an inner surface of a funnel-shaped enclosure surrounding the light-transmitting conical part. Operation display device.