JPS63126123A - Inversion parallel type electromagnetic contactor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a reversing parallel type magnetic contactor, particularly a reversing parallel type magnetic contactor in which two magnetic contactors are installed in parallel to control opening and closing of an electric circuit of a motor with both forward and reverse rotation. Regarding installed type electromagnetic contactors.

[Prior Art] A forward/reverse rotation electric motor is formed with a forward rotation circuit and a reverse rotation circuit, and when one of the circuits is closed, the other circuit is opened and both circuits are connected. At the same time, it prevents current from flowing. Therefore, as an electromagnetic contactor for opening and closing such an electric circuit, two contactors are installed in parallel, one for opening and closing the electric circuit for forward rotation, and the other for opening and closing the electric circuit for reverse rotation, and a movable contactor installed in each contactor is used. The electrical circuits are opened and closed by moving the parts up and down to connect and disconnect the contacts.

In addition, as mentioned above, it is necessary to adjust so that when one magnetic contactor is closed, the other magnetic contactor is not closed, and for this reason, the inverted side-by-side type magnetic contactors are equipped with a locking device. It is being

A conventional locking device is provided between two juxtaposed electromagnetic contactors, and has two protrusions projecting to the left and right that can engage the movable parts of both electromagnetic contactors, respectively. There is one lever rotatably attached to the.

When one movable part is lowered by this lever to close one electric circuit, the movable part of the other electromagnetic contactor is locked to prevent it from lowering.

In other words, when the movable part of one electromagnetic contactor descends, one protrusion of the lever that engages with the movable part is pushed down, the lever rotates by the amount that the protrusion is pushed down, and the other protrusion Its position rises by the angle of rotation. As the other protrusion rises, the movable part of the other electromagnetic contactor is locked from below to prevent the movable part from descending.

[Problems to be Solved by the Invention] However, according to the locking device provided in the conventional inverted side-by-side electromagnetic contactors, this single rotatable lever locks the movable parts of both electromagnetic contactors. This is to adjust and control the lowering operation of the Therefore, in order to allow one of the movable parts to descend, it is necessary to provide a certain distance between both protrusions of the lever and each movable part, and to adjust the position accurately. In other words, if the lever is positioned with both protrusions of the lever in contact with both rotating parts from the beginning, for example, with the upper surfaces of both protrusions in contact with the lower surfaces of both rotating parts, then neither movable part will move. It becomes impossible to descend.

In addition, if the distance between both protrusions of the lever and both rotating parts is too wide, even if one movable part descends and the lever rotates, the other movable part will also close to the protrusions of the lever. This causes a situation in which both the contacts are brought into contact and both the forward and reverse rotation circuits are closed.

Therefore, in order to prevent such a situation in which both rotating parts are lowered simultaneously, it is necessary to set the mounting position of the lever by finely adjusting the distance between the movable part and the protrusion of the lever. That is, a predetermined vertical gap between the movable part and the protrusion to allow one movable part to descend, and a predetermined length of the protrusion to prevent the other movable part from descending when one movable part descends. There was a problem in that the locking device had to be delicately adjusted, making it difficult to manufacture the locking device.

Purpose of the Invention The present invention has been made in view of the above-mentioned problems, and its purpose is to use a two-side locking lever to reliably prevent the simultaneous closing state without requiring fine adjustment of the positioning of the lever. An object of the present invention is to provide an inverted side-by-side type electromagnetic contactor having a locking device.

[Means for Solving the Problems] In order to achieve the above object, the inverted side-by-side type electromagnetic contactor according to the present invention has two inverted-operated electromagnetic contactors each having a movable part that connects and separates the contacts by vertical movement. In an inverted side-by-side electromagnetic contactor that opens and closes two electric circuits using these electromagnetic contactors while preventing them from being closed at the same time using a locking device, the locking device is configured as described above. A holding frame disposed between two electromagnetic contactors, two locking levers corresponding to each electromagnetic contactor and rotatable with respect to the holding frame, and these two chains. Each of the lock levers is configured with a biasing spring that biases the lock levers in opposite rotational directions, and each of the lock levers is engaged with a movable part of a corresponding electromagnetic contactor, and the lock lever is activated by vertical movement of the movable part. It is provided with an engaging protrusion that rotates, and a rotation preventing protrusion that engages with the other locking lever when the movable part is lowered to prevent the locking lever from rotating and thereby prevent the corresponding movable part from lowering. It is something that

[Function] According to the above configuration, when two electric circuits are controlled to open or close by reversing the operation of the two parallel magnetic contactors, the movable part of one of the magnetic contactors is lowered and the contacts are connected. When the electric circuit is closed, the locking lever whose engaging protrusion is engaged with the lowered movable part rotates when the engaging protrusion is pushed down, and this rotation causes another lock lever to be provided. The rotation preventing protrusion locks onto the other locking lever by the rotational movement and prevents the other locking lever from rotating.

Therefore, the movable part of the other electromagnetic contactor that is engaged by the engagement protrusion of the other locking lever cannot be pushed down to perform a lowering operation because the engagement protrusion does not rotate. Thereby, when one movable part is lowered, the action of the two locking levers can reliably prevent the other movable part from lowering.

As described above, in the inverted side-by-side type electromagnetic contactor according to the present invention, the locking device is provided with two locking levers corresponding to the two electromagnetic contactors, and both locking levers are operated by the action of these two locking levers. This is to prevent the magnetic contactors from being closed simultaneously. Therefore, there is no need to make fine adjustments to the distance and position between the protrusion of the locking lever and both rotating parts, unlike when a locking device is constructed by rotating one locking lever. , it is possible to facilitate the manufacture of locking devices. Furthermore, it is possible to effectively prevent the simultaneous closing of two electrical circuits due to slight positional deviation of the locking lever with respect to the electromagnetic contactor, thereby achieving reliable operation of the locking device.

[Embodiment] Fig. 1 is a partially cutaway sectional view showing a preferred embodiment of the inverted side-by-side type magnetic contactor according to the present invention, and shows the main body mounting v2 (
1), two electromagnetic contactors (2a), (2b) are fastened and fixed in parallel with tightening screws (3a), (3b). These two electromagnetic contacts 5 (2a) and (2b) are provided with movable parts (4a) and (4b). Usually, the configuration of the movable parts (4a) and (4b) is such that crossbars (5a) and (5b) are connected to a movable core (not shown), and are located below the movable core (not shown). No fixed iron core is provided. As the movable core moves toward and away from the fixed core, the movable parts (4a), (4
b) is formed to move in the vertical direction.

The crossbars (5a), (5b) have two locking levers (6a), (6
b) engaging surfaces (7a), (7b) and movable contacts (not shown) are provided. And the moving part (
4a), (4b) are formed so that the contacts are opened by upward movement, and the contacts are closed by downward movement.

Therefore, by applying or cutting off a voltage to the electromagnetic coil attached to the fixed core, the movable core can be moved toward or away from the fixed core, and the opening and closing of the electric circuits connected to the respective electromagnetic contactors is controlled.

A locking device (8) for preventing both electromagnetic contactors from being closed simultaneously is fastened and fixed at an intermediate position between the two electromagnetic contactors (2a) and (2b). This locking device (8) is
A flange-shaped fixing part (9a) provided on the bottom of the electromagnetic contactor (2a), (2b) and fixed to the plate (1) for mounting the main body.
, (9b) are provided with engagement grooves (10a), (10b), and the locking device (8) is attached by fitting the bottom portion of the locking device (8) into the engagement grooves. That is, the locking device (8) is provided with a holding frame (11) for mounting the structural members of the device, and the above-mentioned fixing part (9a),
(9b) is provided, and by fitting this protrusion (lla) to the fixed parts (9a) and (9b), the locking device (8) can be installed and fixed. It is being done.

Inside this maintenance rj crusher (11), there are an electromagnetic contactor (2a), (
Two locking levers (6a) and (6b), which are characteristic components of the present invention, are pivotally connected to prevent the locking levers (6a) and (6b) from being closed simultaneously. The locking levers (6a) and (6b) are each provided with two protrusions, and one of the protrusions (12a) and (12b) protrudes outward from the holding frame (11) and is The movable parts (4a), (4b) of the electromagnetic contactors (2a), (2b) are
), (5b) are configured as engaging protrusions that engage with the engaging surfaces (7a), (7b).

In addition, the other protrusions (13a) and (13b) have a function of locking the other locking lever by rotating the respective locking lever and preventing rotation of the other locking lever. It is configured as a rotation prevention protrusion.

Further, the upper ends of the locking levers (6a), (6b) are suction connected to each other by a tension spring (14).
) and (12b) are maintained at the upper limit position as shown in the figure when the electromagnetic contactors (2a) and (2b) are in the open state.

The embodiment has the above configuration, and its operation will be explained below.

Two electromagnetic contactors (2a) and (2b) in this example
is the state where the electric circuit is open, that is, the crossbar (5a
) and (5b) are shown in the upper position, but when a voltage is applied to one of the electromagnetic contactors (2b) from this state, the movable core is attracted to the fixed core and the crossbar is
(5b) moves downward. FIG. 2 shows a partially cutaway perspective view showing the state of the device of this embodiment at this time, in which the locking lever (6b) is rotated counterclockwise. The blocking protrusion (13b) engages with the side surface of the rotation blocking protrusion (13a) of the other locking lever (6a).

This prevents the locking lever (6a) from rotating clockwise, resulting in a completely locked state. Therefore, when the electromagnetic contactor (2b) closes the electric path, the other electromagnetic contactor (2a) always opens the electric path. In this way, according to this embodiment, when one electromagnetic contactor closes the electrical circuit, the other electromagnetic contactor always keeps the electrical circuit open, and both electromagnetic contactors simultaneously close the electrical circuit. This will definitely prevent it from happening.

In addition, by providing two locking levers and rotating only one of them, it is possible to prevent the electrical circuits from being closed at the same time.
The engaging protrusion (
12a), (12b) and crossbar (5a), (5b)
There is no need to make delicate adjustments to the distance and positional relationship between the engagement surface and the engagement surface.

That is, the respective engagement protrusions (12a) and (12b)
is fixed in position so that it can always engage with the engagement surface (7a) of the crossbar (5a), and the rotation prevention protrusion (13a);
(13b) is sufficient as long as it can be locked at a location where the circuit of the locking lever of the other party can be blocked by rotation, and is hardly affected by the delicate positional relationship.

[Effects of the Invention] As explained above, according to the inverted side-by-side type electromagnetic contactor according to the present invention, the locking levers each having an engaging protrusion and a rotation preventing protrusion can rotate independently of each other. A locking lever such as a device that can effectively prevent each electric circuit connected to an electromagnetic contactor from being closed together, and prevents the electromagnetic contactor from being simultaneously closed using only one locking lever. There is no need to make delicate positional adjustments to the engaging protrusion, the locking device can be configured easily, and it is not affected by subtle positional deviations, which prevents the electrical circuits from being closed at the same time. Functional stabilization can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway sectional view of an embodiment of the present invention, and FIG. 2 is a partially cutaway sectional view showing the operation of the embodiment. Identical members in each figure are given the same reference numerals; (1) is a board for mounting the main body, (2a) and (2b) are electromagnetic contactors, (4a) and (
4b) is a movable part, (6a) and (6b) are locking levers, (
11) is a holding frame, (12a) and (12b) are engagement protrusions,
(13a) and (13b) are rotation prevention protrusions, and (14) is a tension spring. Agent Patent attorney Masuo Oiwa (and 2 others) Figure 1 1-, Fl> 4jll
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Claims (1)

[Claims] (1) Two electromagnetic contactors each having a movable part that connects and separates the contacts by vertical movement, installed in parallel on the main body mounting plate and operated in reverse, and two electromagnetic contactors that engage with each of the movable parts A locking device that prevents the contactors from being closed simultaneously; and an inverted side-by-side electromagnetic contactor, the locking device comprising: a holding frame disposed between the two electromagnetic contactors; two locking levers rotatably provided with respect to the holding frame and corresponding to each of the electromagnetic contactors, and a biasing spring that biases the two locking levers in mutually opposite rotational directions; Each of the locking levers has an engagement protrusion that engages with the movable part of the corresponding electromagnetic contactor and rotates the locking lever by the up and down movement of the movable part, and an engagement protrusion that rotates the lock lever when the movable part is lowered. An inverted side-by-side type electromagnetic contactor, characterized in that it is provided with a rotation prevention protrusion that engages with the other lock lever to prevent the lock bar from rotating and prevents the corresponding movable part from lowering.