JPH0440820B2 - - Google Patents

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 pole setting 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 circuit is closed, the other circuit is opened and both circuits are connected simultaneously. Prevents current from flowing. Therefore, as an electromagnetic contactor for opening and closing such an electric circuit, two contactors are installed side by side, 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 each contactor is provided with one contactor for opening and closing the electric circuit for forward rotation. The movable parts are moved up and down to connect and separate the contacts and open and close the respective electrical circuits.

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. 1 rotatably attached to
There are several levers.

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 contactor, this single rotatable lever locks the movable part of the double-electrode contactor. 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. That is, when the lever is positioned with both protrusions of the lever in contact with both movable parts from the beginning, for example, with the upper surfaces of both protrusions in contact with the lower surfaces of both movable parts, both movable parts descend. I won't be able to do that. Also, if the distance between both protrusions of the lever and both movable parts is too wide, even if one movable part descends and the lever rotates,
The other movable part also falls without being stopped by the protrusion of the lever, causing both contacts to come into contact and both the forward and reverse rotation electric circuits to be closed.

Therefore, in order to prevent such a situation in which both movable 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 distance between the movable part and the protrusion in the vertical direction to enable one movable part to descend, and a predetermined distance between the protrusion to prevent the other movable part from descending when one movable part descends. There was a problem in that the length had to be delicately adjusted and the locking device could not be manufactured easily.

Purpose of the Invention The present invention has been made in view of the above-mentioned problems, and its purpose is to use two locking levers, thereby eliminating the need for fine adjustment of the positioning of the levers and reliably preventing the simultaneous closing of the levers. 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 a movable part that connects and separates the contacts by vertical movement, and An inverted side-by-side type including two electromagnetic contactors that are arranged in parallel on a plate and are operated in an inverted manner, and a locking device that engages with each of the movable parts to prevent both electromagnetic contactors from being closed at the same time. In the electromagnetic contactor, the locking device includes: a holding frame disposed between the two electromagnetic contactors, and a locking device that is rotatably provided with respect to the holding frame and corresponds to each of the electromagnetic contactors. It is composed of two locking levers and a biasing spring that biases the two locking levers in mutually opposite rotational directions, and is located on the holding frame side of the movable part of the two electromagnetic contactors. , a recess is formed in a region near the center of rotation of the locking lever, each of the locking levers is bifurcated, and each of the branched ends is inserted into the recess of the corresponding electromagnetic contactor. An engaging protrusion is configured to be inserted into the upper and lower ends of the recess so as to freely engage with the upper and lower ends of the recess in response to the vertical movement of the movable part, and rotates each of the locking levers, and each of the other branched ends is connected to the lowered part of the movable part. The present invention is characterized in that a rotation preventing protrusion is formed which engages with the other locking lever and prevents the corresponding movable part from lowering by blocking the rotation of the locking lever.

"Operation" According to the above configuration, when two electric circuits are controlled to open and close by reversing the two magnetic contactors installed in parallel, 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 engages with the recess provided in the lowered movable part rotates as the engaging protrusion is pushed down. Accordingly, the other rotation-preventing protrusion engages with the other locking lever due to its 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 the action of these two locking levers locks both electromagnetic contactors. This is to prevent the contactors from being closed simultaneously. Therefore, there is no need to make fine adjustments to the distance and position between the protrusions of both locking levers and both movable parts, unlike when a locking device is constructed by rotating one chain lever. , it is possible to facilitate the manufacture of the locking device. Since the engaging protrusion is moved by the recess, there is no need to move the engaging protrusion in the lateral direction, and the movement can be performed reliably. Further, it is possible to effectively prevent two electric circuits from being closed simultaneously due to slight positional deviation of the locking lever with respect to the electromagnetic contactor, and the operation of the locking device can be ensured.

[Embodiment] FIG. 1 is a partially cutaway sectional view showing a preferred embodiment of the inverted side-by-side type electromagnetic contactor according to the present invention. are fastened and fixed in parallel by tightening screws 3a and 3b. These two electromagnetic contactors 2a, 2b are provided with movable parts 4a, 4b. Usually, the configuration of the movable parts 4a, 4b is such that cross bars 5a, 5b are connected to a movable core (not shown), and a fixed core (not shown) is provided below the movable core. . The movable parts 4a and 4b are formed to move in the vertical direction as the movable core moves toward and away from the fixed core.

The cross bars 5a, 5b are provided with two locking levers 6a, 6, which are characteristic components of the present invention, which will be described later.
Engagement surfaces 7a, 7b that engage with b and movable contacts (not shown) are provided. The contact points are opened by upward movement of the movable parts 4a, 4b, and closed by downward movement of the movable parts 4a, 4b. Therefore, by applying or cutting off voltage to the electromagnetic coil attached to the fixed core, the movable core can be connected to and separated from the fixed core, and the opening/closing of the electric circuits connected to each electromagnetic contactor can be controlled. .

A locking device 8 is fastened and fixed at an intermediate position between the two electromagnetic contactors 2a, 2b to prevent both electromagnetic contactors from being closed simultaneously. This locking device 8
is a flange-shaped fixing part 9 provided on the bottom of the electromagnetic contactors 2a, 2b and fixed to the main body mounting plate 1.
It is attached by providing engagement grooves 10a and 10b in a and 9b, and fitting the bottom 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 portions 9a,
A protrusion 11a having a shape to fit with 9b is provided,
The locking device 8 is attached and fixed by fitting the protrusion 11a into the fixing portions 9a, 9b.

Inside this holding frame 11, electromagnetic contactors 2a, 2b are provided.
Two locking levers 6a and 6b, which are characteristic components of the present invention, are pivotally connected to prevent the locking levers from being closed simultaneously. Each of the locking levers 6a, 6b is provided with two protrusions, and one of the protrusions 12a, 12b protrudes outward from the holding frame 11, and is a movable portion of the electromagnetic contactors 2a, 2b. The cross bars 4a, 4b are configured as engaging protrusions that engage with the engaging surfaces 7a, 7b of the cross bars 5a, 5b.

Further, the other protrusions 13a and 13b are rotation prevention protrusions that have the function of locking onto the other lock lever and preventing rotation of the other lock lever when each lock lever rotates. It is configured as.

Further, the upper ends of the locking levers 6a, 6b are suction connected to each other by a tension spring 14, so that the engaging protrusions 12a,
12b is maintained at the upper limit position as shown in the figure when the electromagnetic contactors 2a, 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 embodiment
shows a state in which the electric circuit is open, that is, a state in which the crossbars 5a and 5b are positioned upward, but when a voltage is applied to one of the electromagnetic contactors 2b from this state, the movable core is fixed. The crossbar 5b moves downward as it is attracted by the iron core. FIG. 2 is a partially cutaway sectional view showing the state of the device of this embodiment at this time, and shows the locking lever 6b being rotated counterclockwise and the rotation prevention protrusion 13b of the locking lever 6b being rotated counterclockwise.
engages with the side surface of the rotation prevention 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. There is no need to delicately adjust the distance and positional relationship between the engaging protrusions 12a, 12b and the engaging surfaces of the cross bars 5a, 5b, unlike in the case of a structure that prevents the closed state. That is, each engagement protrusion 12a, 12b is connected to the cross bar 5.
The rotation prevention projections 13a, 13 are fixed in position so that they can always be engaged with the engagement surfaces 7a, 7b of the rotation prevention protrusions 13a, 13
b 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, two locking levers each having an engagement protrusion and a rotation prevention protrusion inserted into the recess of the movable part. It is possible to effectively prevent each electric circuit connected to the electromagnetic contactor from being closed together by the independent rotational movement of each, and the simultaneous closing of the electromagnetic contactor can be prevented by using only one locking lever. There is no need to make delicate positional adjustments of the engaging protrusion of the locking lever, as is the case with other devices, the locking device can be configured easily, and it is not affected by subtle positional deviations. Therefore, it is possible to stabilize the function of preventing the simultaneous closing of the electric circuits.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway sectional view of an embodiment of the present invention;
FIG. 2 is a partially cutaway sectional view showing the operation of the embodiment. The same members in each figure are given the same symbols, 1 is the main body mounting plate, 2a, 2b are electromagnetic contactors, 4a, 4b
1 is a movable part, 6a and 6b are locking levers, 11 is a holding frame, 12a and 12b are engaging protrusions, 13a and 13b
14 is a rotation prevention protrusion, and 14 is a tension spring.

Claims (1)

[Scope of Claims] 1. Two electromagnetic contactors that are arranged in parallel on a main body mounting plate and that are operated in reverse, each of which has a movable part inserted therein that connects and separates the contacts by vertical movement; and each of the movable parts. a locking device that engages with the magnetic contactor to prevent both magnetic contactors from being closed simultaneously; and an inverted side-by-side electromagnetic contactor, wherein the locking device is disposed between the two electromagnetic contactors. a holding frame, two locking levers rotatable with respect to the holding frame and corresponding to each of the electromagnetic contactors, and urging the two locking levers in opposite rotational directions. and a biasing spring, and a recess is formed at a portion near the center of rotation of the chain lever on the holding frame side of the movable part of the two electromagnetic contactors, and each of the locks Each of the levers is bifurcated, and each of the branched ends is inserted into the respective recess of the corresponding electromagnetic contactor so as to be able to freely engage with the upper and lower ends of the recess according to the vertical movement of the movable part. An engaging protrusion for rotating the lock lever is configured, and each of the other branched ends engages with the other lock lever when the movable part is lowered to prevent the lock lever from rotating. An inverted side-by-side electromagnetic contactor characterized by comprising a rotation prevention protrusion that prevents the corresponding movable part from falling.