JPS6025799Y2 - Mechanical interlock device for magnetic contactor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mechanical interlock device for an electromagnetic contactor.

When two electromagnetic contactors are used to switch between forward and reverse rotation of a motor, etc., when one electromagnetic contactor closes, it is necessary to prevent the other electromagnetic contactor from closing.

Examples of conventional mechanical interlock devices will be explained with reference to FIGS. 1 to 4 and 5.

Fig. 1 is a vertical cross-sectional view of an electromagnetic contactor incorporating a conventional mechanical interlock device, Fig. 2 is a cross-sectional view of the mechanical interlock device of Fig. 1, and Fig. 3 is a -A-- The front view seen from line A, Figure 4 is a partial front view during operation, and Figure 5 is the 4th
It is a front view of other examples corresponding to the figure.

In FIG. 1, the forward rotation side electromagnetic contactor 1 and the reverse rotation side electromagnetic contactor 2 are attached to a common base 3, and a mechanical interlock device 4 is attached to the adjacent space via a stand 5. and 42 are coupled to the movable contact supports 1a and 2a of the electromagnetic contactors 1 and 2, respectively.

This mechanical interlock device 4 is a case 1 divided into two parts.
As is clear from FIG. 4, the case 11 is made into a rectangular U-shaped cross section with one side open, and there is a unique heart-shaped piece 31 at the bottom inside. A recess 12 is formed to accommodate the.

The shoulder part 31a of the top 31 is in contact with the stopper part 13 formed on the inner wall of the case 11, and the other shoulder part 31b is in contact with the stopper part 13 formed on the inner wall of the case 11.
The tip 14a of the push rod 14 is slidably provided along the longitudinal direction of the push rod 14.

An arm portion 41 is attached to the push rod 14 and projects outwardly through a long hole 16 provided in the bottom wall 15 of the case 11.

On the other hand, the case 21 is also made to have the same shape as the case 11.

That is, there is also a stopper part (not shown in the figure, 23
A recess 22 corresponding to the recess 12 and a long hole 26 corresponding to the long hole 16 are provided, and a push rod 24 corresponding to the push rod 14 is placed.

However, the stopper part 23 comes into contact with the shoulder part 31b of the top 31, and the tip 24a of the push rod 24 comes into contact with the shoulder part 31a.

Thus, these cases 11 and 21 are stacked with their open surfaces sandwiching the only piece 31 having a considerable thickness.

The pieces 31 placed in the recesses 12 and 22 are the cases 11 and 2.
1 is constantly urged upward by a spring 33 attached between the common pin 32 fixed to the top 31, but the shoulder 31a hits the stopper 13, and the shoulder 31b hits the stopper part 23. By hitting the top 31
It is constructed to suppress the movement of the

By changing the height of the stand 5 in FIG. 1, the vertical position of the interlock device 4 can be changed.

Next, to explain the operation, if the electromagnetic contactor 1 performs a closing operation in FIG. The heart-shaped piece 31 is moved so that the top 31c moves toward the corner 12d in the case 11.21, as shown in FIG.

Therefore, if the top 31c fits into the corner 12d, the top 3
1 becomes unable to swing, the other pusher 7 bar 24 becomes unable to descend, and the electromagnetic contactor 2 is locked.

When the electromagnetic contactor 1 is opened, the top 31 returns to its original position due to the force of the spring 33.

Further, when the electromagnetic contactor 2 performs a closing operation, the top 31c of the top 31 fits into the corner 12c, thereby locking the electromagnetic contactor 1.

If two electromagnetic contactors are energized at almost the same time for some reason, the push rod that operates earlier will rotate the top 31, and the operation by the other push rod can be disabled. .

If the two electromagnetic contactors are of different sizes, that is, if the stroke dimensions of the movable iron core are different, the E dimension and 1 dimension in the case on each electromagnetic contactor side should be calculated as shown in Figure 5. You can set it as appropriate.

In this case, various dimensions inside the case 11 and inside the case 21 will be different.

In a magnetic contactor equipped with the mechanical interlock device 4 as described above, when rapid switching between forward and reverse rotation is performed, for example, before the magnetic contactor 1 on the closing side is completely released, the other magnetic contactor A closing command is often input to the electromagnetic contactor 2.

At this time, the electromagnetic contactor 1 is released, but the top 3 of the top 31
Until 1c exceeds the protrusion 34 of the cases 11, 21, the piece 31 cannot move toward the corner 12c.

Therefore, the electromagnetic contactor 2 cannot be closed even if a closing command is given, and a large excitation inrush current continues to flow through the excitation coil of the electromagnetic contactor 2, which may eventually lead to burnout.

Therefore, the object of this invention is to provide a mechanical interlock device for an electromagnetic contactor that allows rapid switching to occur smoothly.

According to this invention, the above purpose is to prevent the closing operation of the other electromagnetic contactor when one electromagnetic contactor closes by being placed between two electromagnetic contactors, and A heart-shaped top, a spring that constantly applies an upward force to the top, and a spring that abuts the two shoulders of the top, each N'
In a mechanical interlock device for an electromagnetic contactor comprising a push rod that operates the top in conjunction with a movable part of the Ftt contactor, both shoulders of the top are rotatably coupled to the lower ends of the push rod. At the same time, the sum of the tensile force of the spring and the pulling force that the push rod on the side being pushed up can exert on the shoulder of the piece is equal to the downward force that the push rod on the side being pushed down can exert on the shoulder of the piece. It is achieved by making it greater than force.

Embodiments of this invention will be described in detail below based on the drawings.

FIG. 6 is a cross-sectional view of the mechanical interlock device according to this invention (however, the interlock groove portion is shown with its direction 90' changed).

) FIG. 7 is a cross-sectional view of the mechanical interlock device according to this invention.

In the figure, the difference from the conventional example is that U-shaped opening grooves 51a1 and 51b1 are formed on the outer edges of both shoulders 51a and 51b of the only heart-shaped piece 51 housed in the lower part of the case 50 of the mechanical interlock device 40. Arms 41 and 4 provided and coupled to the electromagnetic contactors 1 and 2
The push rods 41a and 42a respectively attached to the push rods 41a and 42a are provided with protrusions 41b and 42b on their end sides, and are engaged with the grooves 51al and 51b1.

The operation of the thus configured interlock device 40 is as follows.

That is, for example, when the electromagnetic contactor 1 performs a closing operation and the arm portion 41 descends due to the downward movement of the movable contact support 1a, the protrusion 41b provided on the side surface of the end of the push rod 41a fits into the groove 51a. Heart-shaped piece 5 by being
1 is moved, and the top part 51c is moved to the case 50 as shown in FIG.
toward the corner 50c.

When the top portion 51c fits into the corner portion 50c, the top 51 becomes unable to swing, so the other push rod 42a becomes unable to descend, and the electromagnetic contactor 2 is locked.

When the electric contactor 1 opens, the force of the spring 33 and 7
The top 51 is returned to its original position by the lifting blade of the opening spring 1b of the electromagnetic contactor 1 acting on the magnetic contactor 451al.

Further, when the electromagnetic contactor 2 performs a closing operation, the top 51c of the top 51 fits into the corner 50d, thereby locking the electromagnetic contactor 1.

If two electromagnetic contactors are excited at almost the same time for some reason, the top 51 is rotated by the push rod that operates first, as in the conventional example described above, and the operation by the other push rod is rotated. make impossible.

Next, when a switching signal from normal rotation to reverse rotation or from reverse rotation to normal rotation is rapidly applied, the protrusions 41b and 41b on the electromagnetic contactor 1.2 side engage with the grooves 51al and 51bl of the block 51, respectively. For example, if the electromagnetic contactor 1 is now released, the force from the opening spring 1b will be applied to the groove 51al.
If the sum of this force and the force of the spring 33 is made larger than the downward force of the push rod 42a, the top 51c of the top 51 will press the protrusion 50b of the case 50. Even if the protrusion 42b pushes the 7R51bl downward in response to a closing command from the electromagnetic contactor 2 before it crosses the line, the piece 51 moves smoothly.

When the top portion 51c exceeds the protrusion 50b, the electromagnetic contactor 2 is turned on and the switching from normal rotation to reverse rotation is completed.

It goes without saying that switching from reverse rotation to forward rotation is also performed in the same manner.

In addition, in this embodiment, the top 51 and the push rod 41av4
2a, the O-shaped grooves 51al, 51b1 and the protrusion 41
b and 42b, the holes may be connected with pins in each of the top and the push rod.In other words, other structures may be used as long as the top and the push rod are connected rotatably.

As described above, according to this invention, it is possible to provide a mechanical interlock device for an electromagnetic contactor in which rapid switching is smoothly performed.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of an electromagnetic contactor incorporating a conventional mechanical interlock device, Fig. 2 is a cross-sectional view of the mechanical interlock device of Fig. 1, and Fig. 3 is a line A-A in Fig. 2. 4 is a partial front view of FIG. 3 during operation, FIG. 5 is a partial front view of another conventional example corresponding to FIG. 4, and FIG. 6 is a machine according to the present invention. FIG. 7 is a cross-sectional view of an electromagnetic contactor equipped with a mechanical interlock device (however, the mechanical interlock device is rotated 90' with respect to the electromagnetic contactor). FIG. 1.2...Magnetic contactor, la, 2a...
・Movable contact support, 1b... Opening spring, 33.
... Spring, 40 ... Mechanical interlock device, 41° 42 ... Arm part, 41a,
42a...Push rod, 41b, 42b...
・Protrusion, 50...Case, 50a...
Inner wall, 50b...Protrusion, 50c, 50d
...Corner, 51...17.51a 1
, 51bl...U-shaped groove, 51c...
Top.

Claims (1)

[Scope of utility model registration request] It is placed between two electromagnetic contactors, and when one electromagnetic contactor closes, it prevents the other electromagnetic contactor from closing, and there is a heart-shaped piece inside the case and a heart-shaped piece attached to the piece. A mechanical interlock for an electromagnetic contactor comprising a spring that constantly applies an upward force and a push rod that abuts the two shoulders of the top and moves the top in conjunction with the movable part of each electromagnetic contactor. In the device, both shoulders of the top are rotatably connected to the lower ends of the push rods, and the tension of the spring and the pulling force exerted on the shoulders of the top by the push rod on the side to be pulled up are reduced. A mechanical interlock device for an electromagnetic contactor, characterized in that the sum of the sum is greater than the downward force that the push rod on the side being pushed down can exert on the shoulder of the piece.