JPH04206224A - Electromagnetic contactor - Google Patents

Abstract

PURPOSE:To clearly display the consumption condition of a contact by detecting the displacement of a moving insulating board at the time of connection between a fixed contact and a moving contact through a detection means, and by enlarging the displacement through am enlarging means so as to transmit it to a display means. CONSTITUTION:A detection means 7e for detecting the displacement of a moving insulating board 3 at the time of connection between a fixed contact 10a and a moving contact 9a, an enlarging means 7 for enlarging the displacement detected by the detection means 7e, and a display means 20 for displaying that the displacement reaches a predetermined value, are provided. An arrow indicating that the consumption of a contact reaches a predetermined level, is indicated on a display surface 7a of a display body as the enlarging means 7. A transmission part as a detection means 7e for detecting the movement of an interlocking rod 6 is provided on the display body 7. The consumption condition of the contact can easily be discriminated, and safety as well as reliability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electromagnetic contactor having a function of displaying the wear state of the contacts.

[Conventional technology]

With conventional technology, to check when it is time to replace the contacts of an electromagnetic contactor due to wear and tear, a measuring instrument is applied to a part of the movable insulating stand on which the movable contact is attached through the opening of the insulating stand cover, and the movable contact and the fixed contact are checked. The coil was energized and the electromagnet measured the difference in dimension between the position of the movable insulating table when it was in contact and the position of the movable insulating table when it was closed, and it was determined whether the dimensions were below the minimum allowable value or not. .

On the other hand, energize the coil, close the contacts, open the insulator cover, and visually check the display window provided in the spring receiver that moves to follow the displacement of the contacts to see if the minimum allowable value has been reached.

[Problems to be solved by the invention] - The prior art has the following problems.

1. There was a risk of an accident if the insulating stand cover was opened by mistake while equipment consisting of an electric circuit equipped with an electromagnetic contactor was in operation.

2. The guide for regulating the movement of the movable insulating table is installed near the opening, and the area around the opening becomes dirty with abrasion particles caused by repeated movements, and the name plate on the outer cover that is directly above the opening gets worn out. Powder adhered to the paper, making it difficult to read the written information. On the other hand, the opening serves as an entry point for foreign matter, causing problems such as poor contact of the contacts and inhibiting the movement of the movable part.

3. In order to recognize the state of wear and tear on the contacts, it was difficult to measure and distinguish them from the front, as electromagnetic contactors and other equipment of different sizes were installed on the control panel.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic contactor that can easily determine the state of wear of the contacts and has excellent safety and reliability.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an electromagnetic contactor equipped with a movable insulating stand having a fixed contact and a movable contact arranged opposite to the fixed contact. The present invention further comprises a detection means for detecting the displacement of the movable insulating table upon contact, an enlargement means for enlarging the displacement detected by the detection means, and a display means for displaying that the displacement has reached a predetermined value. It is characterized by:

[Effect]

The detection means detects displacement of the movable insulating base when the fixed contact and the movable contact come into contact. The magnifying means magnifies this displacement and transmits it to the display means. The display means indicates that the contact is in a worn out state when the amount of displacement reaches a predetermined value. This makes it possible to clearly display the wear status of the contacts.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 15.

A first embodiment of the present invention will be described with reference to FIGS. 1 to 11. Figures 1 and 2 are the front view of the electromagnetic contactor according to the present invention! 3 and 5 are a left side view, a front view, and a bottom side view of the display device, respectively.

FIG. 6 is a sectional view showing the structure of the display device. FIG. 7 is an exploded perspective view showing the structure of the contact wear amount display device, and FIG. 8 is a sectional view showing the main parts of this embodiment.

The frontage cover 4 is provided with a locking piece 4b that engages with the stepped portion 5b of the case 5. The case 5 is provided with a through hole 5f that guides the interlocking rod 6 that transmits the movement of the contact points, and the display body 7 serving as the second sign is rotated along the axis of the display body 7 that is rotated according to the movement of the interlocking rod 6. A bearing 5g of the portion 7b and a display portion 5h serving as a first sign are provided.

The display surface 7a of the display body 7 is provided with an arrow 20 as a display means indicating that the wear of the contact point has reached a predetermined amount. A guide for attaching a return spring 8 to follow the interlocking rod 6 and a stepped portion 7c for receiving one end 8a of the spring are provided.The bearing of the shaft portion 7b of the 0 display body is the bearing 5g of the case.
and a bearing 4c provided on the frontage cover 4. The other end 8b of the return spring 8 is received by the inner wall 5j of the case 5, and is mounted so that the indicator 7 is pushed back toward the interlocking rod 6 and the bottom surface 5 of the case 5. Case 5 is attached to interlocking rod 6.
The frontage cover 4, which is provided with a stopper part 6a to prevent it from falling off, has a second mark 117 and a first mark that appears when the second mark is rotated. A sign g4a is provided at a position facing Ish3. On one side of the indicator window 4a, there is a second
An indicator portion 4e is provided so that the tip of the arrow 20 of the indicator 117 indicates the state of wear of the contact.

In this embodiment, the relationship between the distance r from the transmission part 7c to the axis 7b and the distance 111R from the display surface 7a to the axis 7b is set so that R>r, and the display body 7 also functions as an enlargement means. have.

The operating mechanism of the contact wear amount display device when the electromagnetic contactor is in the non-moving fj & (OFF) state will be explained with reference to FIGS. 9(a) and 9(b). A pressing part 3d formed on the upper part of the movable insulating base 3 on which the movable contact base 9 having the movable contact 9c is mounted follows the movable contact 9a and pushes the interlocking rod 6 into the case 5.
At this time, the transmission part 7e3 of the sign body 7 is pushed up, and the sign body rotates using the shaft part 7b as a branch until the second sign provided on the sign body 7 cannot be seen from the display window 4a provided on the frontage cover 4. It is configured to do so. In addition, at this time, the movable contact base 9 and the fixed contact base l
The distance *L from O is approximately 7 to 8 m in this embodiment. At this time, a first mark 1ash provided on the case 5 is provided at a position facing the display window 4a. In this state, the arrow 2o of the second marker does not indicate the amount of consumption.

On the other hand, when the contacts 9a and 10a of the electromagnetic contactor are energized when they are new or not worn out, No. 1013!1 (a
), as shown in (b), the movable contact base 9 and the fixed contact base 1
0 is the distance 11 which is the sum of the thickness of each contact point 9a and 10a
After being released by tL, the pressing portion 3a moves following the displacement of the movable contact 9a from the OFF state. At this time, the return spring 8 is configured to return the indicator body 7 and the interlocking rod 6 to the pressing part 3a, so that the second indicator 7a is located outside the first indicator 5h at a position where they overlap and is displayed. It is configured to return to a position facing the window 4a. Therefore, in this state, the first mark is hidden behind the second mark, and the arrow 20 of the second mark indicates the portion of the display section 4e that displays the large amount of contact wear.

Furthermore, as the contacts 9a and lQa of the electromagnetic contactor continue to wear out, the distance between the movable contact base 9 and the fixed contact base 10 becomes L2 (Lm < LX), as shown in FIGS. 11(a) and 11(b).
The pressing portion 3a is roughly displaced, the indicator 7 is rotated, and the arrow 20 of the second marker indicates a portion of the indicator 4c that indicates a large amount of contact wear. In this embodiment, when the contact is new, the length is usually about 2 m, and the contact wears out and reaches the end of its life when L2 reaches FJ1. Therefore, when L2 becomes approximately 1 mm, the arrow 20 is set to indicate the position where the amount of contact wear is large. According to this embodiment, the frontage correction is
By covering the cover with a cover that has a motion tracking function that allows Wi-close or If-release, the electromagnetic contactor has a function of displaying the amount of contact consumption and the safety of the operator is ensured.

A second embodiment of the present invention will be described with reference to FIGS. 12 and 13. This embodiment is an example in which the present invention is applied to an electromagnetic contactor in which a movable contact stand 29 moves in the horizontal direction. In this embodiment, the fixed contact 10a and the movable contact 9a are provided to face each other in the horizontal direction, and the movable contact 9a is held by the movable contact base 29 and works together with the movable insulating base 29 by energizing or de-energizing an electromagnet (not shown). In this embodiment, the movable ll! moves in the horizontal direction and becomes ON'KBt or OFF, respectively. ,! Four rack-shaped parts 29a are provided on the base 29, and engage with an engaging part 27c of the display body 27 rotatably supported on a shaft 27b. The display body 27 has a display portion 27a as a display means facing the display window 24 provided on the upper surface of the case 20. Even in the non-embodiment, the distance r from the shaft 27b to the tip of the engaging portion 27c and the distance MR from the shaft 27b to the display portion 27a are formed such that R>r, and the display body 27 is connected to the movable insulating base 29. The 0 indicator 27, which also functions as a displacement magnifying means, rotates clockwise in accordance with the movement of the movable insulating table 29 when the electromagnet is excited. Contact 9a! Compared to the displacement of the movable insulating base 29 when changing from the OFF state to the ON state when 10a is new, when the contacts 9a+10a are worn out, the displacement of the movable insulating base 29 increases by the amount of wear, and the display body 27 The amount of rotation also increases. In this embodiment, the wear of the contacts is displayed by changing the color of the portion appearing in the display window 24 when the amount of rotation increases. In this embodiment, it is possible to know whether the contacts are worn out by a change in color within the display window.

A third embodiment of the present invention will be explained with reference to FIGS. 14 and 15. In this embodiment, the lever 30 is used to connect the contacts 9a and 10a.
The display body 37 is configured to detect the wear and tear of the cover 2, and to make the display body 37 protrude from the surface of the cover 2 when the wear is detected. In this embodiment, the lever 30 is rotatably supported on a shaft 32, has an engaging portion 30a as a detection means that engages with the movable insulating table 3 at one end, and displays an enlarged view of this movement at the other end. It has an arm portion 30b as an enlargement means for transmitting information to the body 37. The distance r from the shaft 32 to the tip of the engaging portion 30a and the length R from the shaft 32 to the tip of the arm portion 30b are set so that R>r. In this embodiment, an engaging part 3b is formed on the side surface of the movable insulating table 3, and this engaging part 3b is in the OFF state and the contacts 9a, 10a
In the ○N state when is new, the engaging portion 30a of the lever 30
It is provided so that it does not engage with the engaging portion 30a, but engages with the engaging portion 30a when the contacts 9a+10a are worn out. As a result, when the contact wears out, the engaging part 30a engages with the engaging part 3b, the lever 30 rotates counterclockwise, and the display body 30 is pushed up to display the contact wear. According to this embodiment, contact wear can be visually confirmed from the side.

〔Effect of the invention〕

According to the present invention, it is possible to easily determine the state of wear of the contacts, and to obtain an electromagnetic contactor that is excellent in safety and reliability.

[Brief explanation of the drawing]

1 and 2 are a front view and a side sectional view, respectively, of an electromagnetic contactor according to a first embodiment of the present invention, and FIGS. 3 and 4, respectively.
5 is a left side view, a front view, and a bottom side view of the display device of this embodiment, FIG. 6 is a bottom sectional view showing the configuration of the display device of this embodiment, and FIG. 7 is a diagram of the display device of this embodiment. FIG. 8 is a left sectional view showing the main parts of the display device of this embodiment, and FIGS. 9 (a) and (b) are left sectional views of the embodiment in the OFF state. The figure, front view, and FIGS. 10(a) and 10(b) respectively show the ON state of the contacts of this example when new.
Left sectional view and front view of the state, FIGS. 11(a) and 11(b)
) are a left side sectional view and a front view of the present embodiment when the contacts are worn out, and FIGS. 12 and 13 are a front view and a side sectional view of the electromagnetic contactor in the second embodiment of the present invention, respectively,
4 and 15 are side sectional views of the main parts of the third embodiment of the present invention when the contact is new and when the contact is worn out. 3.29: Movable insulating stand, 7e, 27c, 30a: Detection means, 7.27.30b: Enlargement means, 9a: Movable contact, 10a: Fixed contact, 20.27a, 37: Display means. Fig. f Fig. 2!2] Fig. 3 Fig. 4 $ 6 Fig. e J No. 7 Calculation 8 Fig. 12 Concave $I3 Fig. $15 Fig.

Claims (1)

[Claims] 1. In an electromagnetic contactor equipped with a movable insulating stand having a fixed contact and a movable contact provided opposite to the fixed contact,
a detecting means for detecting the displacement of the movable insulating base when the fixed contact and the movable contact come into contact; a magnifying means for magnifying the displacement detected by the detecting means; and a magnifying means for magnifying the displacement detected by the detecting means; An electromagnetic contactor characterized by comprising display means for displaying.