JPS6025800Y2 - Magnetic contactor interlock device - Google Patents

Description

[Detailed description of the invention] This invention is a mechanical interlock device attached to an electromagnetic contactor when two electromagnetic contactors are used reversibly, especially an interlock device for two electromagnetic contactors with different capacities. Regarding.

Although many electric motors are used in industrial machinery and are frequently started and stopped, it may be a problem if two of these electric motors are operated at the same time.

In such cases, an interlock device as shown in Figure 1 is installed between the two electromagnetic contactors that start and stop the motor, so that while one electromagnetic contactor is turned on, the other electromagnetic contactor is turned on. is configured such that input is prevented.

In FIG. 1, an ink lock device 2 whose internal structure is shown in FIG. Part 4, 4'
6 and 6' are used as fulcrums and are pressed alternately by levers 5 and 5' connected to the levers 5 and 5'.

7 and 7' are fixed cores of both electromagnetic contactors, 8 and 8' are movable cores, 9 and 9' are coils, and 10 and 10' are contacts.

In FIG. 2, a heart-shaped cam 11 is supported by a coil spring 12 at its upper center.

The bottom of the case 13 housing the cam 11 is provided with a curved bottom 13b with a raised central portion 13a so that the lower end 11a of the cam 11 slides into contact therewith.

Now, when the electromagnetic contactor 1 is turned on and the fixed core 7 attracts the movable core 8 (at this time, the contact 10 closes), the movable core 8
The movable part 4, which is integrated with the movable part 4, moves downward and uses the support shaft 6 as a fulcrum to push down the lever 5 and push the push rod 3.

Then, the right side of the cam 11 is pushed down against the coil spring 12, and while tilting to the right, the tip 11a of the cam touches the case 13b.
Touching the bottom left side.

When the electromagnetic contactor 1 is turned on, the ink lock device 2
If you try to insert the electromagnetic contactor 1' during this time, the cam 11 is present between the push rod 3' and the bottom 13b of the case 13, and the push rod 3' is pressed down. cannot descend.

That is, since the lever 5' cannot be pushed down and the movable part 4' of the electromagnet cannot be pushed down, the electromagnetic contactor 1' is locked.

Of course, when the electromagnetic contactor 1 is released, the push rod 3 is raised twice, and the cam 11 is returned to its original position by the spring 12 of the coil.

Here, when the electromagnetic contactor 1' is turned on, the ink lock device 2 operates in the completely opposite manner to the above to lock the electromagnetic contactor 1.

The conventional interlock device described above has a complicated connection between the electromagnetic contactor and the ink lock device, has a large number of parts, and uses levers and push rods dedicated to each capacity, making it inflexible to connect electromagnetic contactors with different capacities. The installation was difficult to use.

The purpose of this invention is to eliminate the above-mentioned drawbacks and provide a mechanical interlock device that is easy to configure and install, is independent of capacity, and is also capable of interlocking between electromagnetic contactors of different capacities. .

As a distant relative of this purpose, this device is housed in an independent gauge and has a central part supported by a spring. Both ends of the force are alternately pressed by push rods each connected to the movable parts of two electromagnetic contactors. In the interlock device for an electromagnetic contactor, two push rods each having a connecting columnar projection on the side surface and a downward pressing projection on the side surface perpendicular to the columnar projection are combined symmetrically to each other, An interface [1] characterized in that the columnar projections of each of the push rods are respectively projected toward both sides from windows provided on opposing surfaces of the case, and are housed in the case so as to be slidable above each other. provide a device for

By adjusting the heights of this ink lock device and two electromagnetic contactors using a liner and combining them, it can also be used as an interlock device between electromagnetic contactors of different capacities.

Next, an embodiment of this invention will be described in detail based on the drawings.

As shown by the solid line in FIG. 3, the push rod 3 has a columnar projection 3 on its side wall for connection with the electromagnetic contactor main body, facing toward the electromagnetic contactor.
A and a downward protrusion 3b for cam pressing are provided on the side wall separated by 90 degrees from the columnar protrusion 3a.

Further, another push rod 3' having the same shape as this push rod is shown by a broken line, and the two combined push rods can be slid against each other in the length direction.

Furthermore, a notch is provided for forming a groove 3c into which the cam 11 is inserted, and a groove 3d passing through the shaft 14, which serves as a fixing point for the coil spring 12 and serves as a guide for the push rods 3, 3'.

As shown in FIG. 4, the push rods 3 and 3' are combined symmetrically, and the cam 11 is inserted into the groove 3C. spring 12
one end is fixed, and the other end is used to support the cam 11 so as to hang it;
The downward protrusions 3b, 3b of the push rods 3, 3' are located at both ends of the cam 11.
' Assemble so that they are in contact.

The push rods 3, 3' and the cam 11 are housed in the case 13 so that the columnar projections 3a, 3a' protrude from opposite side walls of the case 13 to both sides.

The window of the case 13 from which the columnar projections 3, 3a/ are projected is provided vertically so that the push rod 3.degree. 3' can slide up and down.

In this way, the unit of the ink lock device 2 is completed.

This interlock device 2 is similar to the device explained in FIGS. 1 and 2, and when either one of the two electromagnetic contactors is turned on, the electromagnetic contactor of both push rods 3.3' Either one of the cams linked to the container is pressed, and the cam 11 is pressed by the downward protrusions 3b, 3b' and tilts to the right or left.

At this time, the shoulder on the opposite side of the cam rises slightly and remains in this state while one electromagnetic contactor is turned on.

Also, during this time, the push rod on the side where the shoulder of the cam is raised cannot be pushed down.

Therefore, another electromagnetic contactor cannot be inserted.

In other words, it is locked.

The force with which the movable core of a magnetic contactor is attracted to the fixed core and the distance it moves will vary somewhat depending on the configuration and capacity of the magnetic contactor, but after the movable core has already been attracted, this attraction Since the force is much larger than the initial suction force, even if an attempt is made to turn on the electromagnetic contactor on the opposite side, the initial suction force of this electromagnetic contactor will not be able to push down the cam.

In addition, as shown in FIG. 4, if the bottom center part 13a of the case of the ink lock device 2 is made medium-height, the force of the tip 11a of the cam 11 to return to its original position is limited, so that the cam 11 is not affected by the electromagnetic force that is about to be inserted later. The force that locks the contactor is even greater.

Next, if the push rod of the interlock device has a sufficient sliding distance, it is possible to accommodate slight differences in the movement distance due to differences in the capacity of the electromagnetic contactor. .

Therefore, it is possible to attach it to an already prepared electromagnetic contactor as shown in FIG. 5 or 6.

In FIG. 5, a screw hole 15a for mounting an auxiliary contactor 16 and a connecting window 15b for a movable part are provided in advance on the side surface of a case 15 of the electromagnetic contactor 1.

The auxiliary contact installed here is used to add the number of contacts on the electromagnetic contactor main body, and there are fixed contacts and fixed contacts in the outer shell formed independently of the electromagnetic contactor main body case. The movable contact support is provided with a movable contact and a movable contact support that holds the movable contact and moves vertically relative to the fixed contact. A columnar protrusion for coupling with the movable contact support inside the electromagnetic contactor body case is provided, and a hole larger than the outline of the columnar protrusion is provided on the opposite side of the columnar protrusion. A window larger than this hole and a hole through which a screw for coupling with the electromagnetic contactor main body case passes are provided, and the electromagnetic contactor is configured as a unit.

This auxiliary contactor 16 is attached to the electromagnetic contactor main body 1 by a screw 17.
At this time, the connecting columnar projection 16a of the auxiliary contact 16 is inserted through the window 15b of the main body 1 into the connecting hole of the movable part inside.

In this way, the operation of the electromagnetic contactor 1 continues as it is with the auxiliary contactor 16.
The signal is transmitted to and controls the opening and closing of the auxiliary contact 16.

Next, on the surface opposite to the surface having the columnar projection 16a of the auxiliary contact 16 is a window 16 into which the columnar projection of the next auxiliary contact is inserted.
b is provided, and the movable part inside thereof is provided with a connecting hole, into which the connecting columnar projection 3a of the interlock device 2 described above is inserted.

Also, the auxiliary contactor 16' is attached to the other electromagnetic contactor 1' on the opposite side in the same way as the previous electromagnetic contactor 1, and the columnar protrusion 3'a of the interlock device 2 is attached to the window 16'. insert.

In this way, the ink lock device is sandwiched between the electromagnetic contactors 1 and 1' via the auxiliary contacts 16 and 16', and the movable parts of each unit are assembled so that they can be connected and moved.

Of course, the connecting protrusion of the auxiliary contact and the connecting columnar protrusion of the interlock device have the same dimensions, so if one or both of the auxiliary contacts are not needed, they can be omitted, and if necessary, they can be added. It is also possible to do so.

As already mentioned, the interlock device according to this invention can be used between electromagnetic contactors of different capacities;
In this case, the external dimensions are different.

Therefore, as shown in FIG. 6, a liner 18,
19 is inserted, and the height of the liner 18, 19 is adjusted to adjust the height of the joint of each unit.

As mentioned above, the ink lock device for magnetic contactors according to this invention is easy to construct and install as a single unit, can be used regardless of the capacity of the magnetic contactor, and can also be used between magnetic contactors of different capacities. It is an effective device that can be installed over time using a simple liner.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing the configuration of an electromagnetic contactor equipped with a conventional ink lock mechanism, FIG. 2 is a vertical sectional side view showing the ink lock mechanism of FIG. 1, and FIGS. 3 and subsequent figures are based on this invention. Figure 3 is a perspective view of the push rod, Figure 4 is a sectional view of the in-lock device case, and Figure 5 is a perspective view to explain how the interlock device is attached to the electromagnetic contactor. FIG. 6 is a front view of an ink lock device installed between electromagnetic contactors of different capacities. 1.1'...Magnetic contactor, 2...Inclock device, 3,3'...Push rod, 3at
3'a... Columnar projection of push rod, 3b, 3'b
...Downward protrusion of push rod, 3C...force l,
Groove, 3d...Guide rod of push rod, 11...
・・Bart type cam, 12・・・・・Il spring, 1
3... Ink lock device case, 18.19.
...Raina.

Claims (1)

[Claims for Utility Model Registration] 1. A cam that is housed in an independent case and whose central portion is supported by a spring, so that both ends of the cam are alternately pressed by push rods connected to the movable parts of two electromagnetic contactors. In the interlocking device for an electromagnetic contactor, two push rods each having a columnar projection for connection on the side surface and a downward projection for pressing on the side surface perpendicular to the columnar projection are combined symmetrically to each other. An interlock device for an electromagnetic contactor, characterized in that the columnar projections of the push rods are respectively projected from windows provided on opposing surfaces of the case toward both sides, and are housed in the case so as to be slidable vertically. . 2 Utility model registration Claim 1. Interlock of electromagnetic contactors, characterized in that the heights of ink lock devices arranged in two electromagnetic contactors with different capacities are adjusted by liners. Device.