JPS6320042Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an erroneous insertion prevention device that prevents an electromagnetic switching device from being erroneously inserted due to impact or the like.

Figures 1 to 6 show conventional devices of this type. In the figures, 1 is an electromagnetic switching device such as an electromagnetic contactor, 2 is a connecting rod connected to the movable part of the electromagnetic switching device 1, and A latch lever 3 is connected to a connecting rod 2 by a connecting shaft 4, which moves in the direction shown by arrow A in FIG. 1 when a coil (not shown) is energized or deenergized.
5 is a support for supporting one end of the latch lever 3; 6 is a latch receiver provided at the other end of the latch lever 3; 7 is an electromagnetic coil of an erroneous insertion prevention device; and 8 is an electromagnetic coil energized by the electromagnetic coil 7. The movable iron core is attracted, 9 is a pushing spring that always pushes the movable iron core 8 in a certain direction and brings the notch 8a at the tip into contact with the latch receiver 6, 10 is an actuating plate that is linked to the movement of the movable iron core 8, and 11 is a pushing spring. The auxiliary switch is operated by an actuating plate 10, and the auxiliary switch 11 is constantly brought into contact with the auxiliary switch 11 to open a normally closed contact. 12 is a yoke plate; 13 is a mounting plate for the yoke plate 12 and the support 5; 1
4a, 14b are L-shaped lever A, lever B, 1
5a, 15b are lever A, 14a, lever B, 1
16a is a mounting plate A that supports lever A, 14a and torsion spring A, 15a via shaft A, 17a; 16b is lever B; 14b
The mounting plate B, 18a that supports the torsion spring B, 15b via the shaft B, 17b is connected to the lever A, 14.
Pin A, 18b fixed to lever B, 14
Pin B, 19 fixed to b is a pin C that connects mounting plate A, 16a and mounting plate B, 16b.

As shown in FIGS. 3 to 6, the conventional erroneous loading prevention device configured as described above has pins A,
18a and pin C, 19 and torsion spring A, 15a
The lever A, 14a is held so as to face the actuating plate 10 in an inverted L shape by stretching both ends of the lever A, 14a. Therefore, the lever A, 14a is attached to the side surface 14 shown in FIG.
c and the upper end surface 1 of the wing section of the actuating plate 10 shown in FIG.
0a is always maintained at a predetermined dimension, and similarly, the levers B and 14b are connected to the side surface 14e shown in FIG. The distance Y is always maintained at a predetermined dimension.

Therefore, in normal operation, even if the electromagnetic coil 7 is excited by turning on a switch (not shown), and as a result, the movable core 8 is attracted and moves to the right, the upper end surface 10a of the wing portion of the actuating plate 10 and the lower The end surface 10b maintains predetermined dimensions X and Y between the two side surfaces 14c and 14d of the levers A, 14a and B, 14b, respectively, so that there is no interference between them, and the operating plate 10 is connected to the movable iron core 8. Move to the right according to the movement of. As a result, latch plate 3
At the same time, the operation plate 10 is driven to close the contacts (not shown) of the auxiliary switch 11, and the electromagnetic switch is turned on.

By the way, when an impact is applied in the vertical and longitudinal directions shown by arrows B and D in FIGS. 1 and 2, the movable core 8 does not move in these directions, so the engagement between the latch receiver 6 and the movable core 8 The latch lever 3 and the connecting rod 2 cannot move, and the electromagnetic switching device 1 does not malfunction.

However, the situation is different when the direction of the impact is in the left-right direction indicated by arrow C in FIG. First, when an impact is applied to the right, the movable iron core 8 tries to move against the spring pressure of the push spring 9. On the other hand lever A, 14
As shown in FIG. 5, a rotates counterclockwise around the axis A, 17a, and moves to the position indicated by the dashed line. In this case, the movable iron core 8 is a torsion spring A, 15a.
Since the lever A, 14 is restricted by the spring pressure of
The rotation of a is faster than the rightward movement of the movable iron core 8, and as a result, the end surface 14d of the lever A, 14a is located in front of the movement of the actuating plate 10. Therefore, even if the movable iron core 8 tries to move rightward, the actuating plate 10 comes into contact with the end surface 14d of the lever A, 14a, and the rightward movement is restricted. Further, when an impact is applied to the left, the movable iron core 8 cannot move to the left because of the latch receiver 6, but it tries to move to the right due to the reaction of colliding with the latch receiver 6. However, lever B,
As shown in FIG. 6, lever 14b rotates clockwise around shafts B and 17b against the urging force of torsion springs B and 15b, and moves as shown by chain line lever B and 14b'. As in the case of A, 14a, the actuating plate 10 attempting to move to the right comes into contact with the end surface 14d of the lever B, 14b, and the movement of the movable iron core 8 to the right is restricted. In addition, lever A, 1
4a and levers B and 14b are connected to pins C and 1, respectively.
Both ends of torsion springs A, 15a, B, 15b sandwich pins A, 18a, and pins B, 18b from both sides.
Since it is always in contact with b, 19, lever A, 1
4a and B, 14b have torsion springs A, B, 15
a and 15b, it is urged to return to the position indicated by the solid line in FIGS. 5 and 6. Therefore, when the levers A, B, 14a, and 14b are subjected to an impact to the right or left as described above, they first rotate counterclockwise or clockwise as shown by the dashed line, and the actuating plate The movement of the torsion spring A is restricted, but if the impact force disappears after that, the torsion spring A,
B, 15a, 15b force automatically causes the fifth
It returns to the position shown by the solid line in FIGS.

By the way, in the conventional device configured as described above, the distance between the lever A, 14a and the lever B, 14b and the actuating plate 10 is Y varies considerably. If the values of X and Y are large, when an impact is applied, the levers A, 14a,
It takes a long time for the levers B and 14b to move to the position where they block the rightward movement of the actuation plate 10, and during that time the actuation plate 10 moves to the right without being blocked by the levers A and 14a or the levers B and 14b. move,
Therefore, the latch receiver 6 and the movable iron core 8 are disengaged, and at the same time the contacts of the auxiliary switch 11 are closed, creating a risk that the electromagnetic switching device 1 will be erroneously closed.

Furthermore, if the values of X and Y are small, even a tolerable slight impact will move the end portions 14d of the levers A, 14a and B, 14b to a position where they come into contact with the actuating plate 10. The electromagnetic switching device 1 will not be able to operate normally.
As described above, the problem with conventional devices is that due to variations in the values of the interval dimensions X and Y, the incorrect loading prevention device cannot operate normally, resulting in a lack of safety and reliability. Was.

This invention aims to provide a reliable and erroneous loading prevention device that solves the above-mentioned problems of conventional devices.

An embodiment of this invention will be described below with reference to FIGS. 7 to 11. In the figures, the same reference numerals as in FIGS. 1 to 6 indicate the same or equivalent parts, 20 is an adjusting screw screwed into the mounting plate A, 14a and the mounting plate B, 14b, and 20a is the eccentricity of the tip of the adjusting screw 20. It is the axis. The adjusting screw 20 contacts the side surface 14f of the lever A, 14a and the outer peripheral surface of the eccentric shaft 20a, as shown in FIG. It is in contact with the outer surface. 21 is a locking nut for the adjusting screw 20.

The present invention is constructed as described above, and the same reference numerals as in FIGS. 1 to 6 operate in the same manner as in the conventional example. FIG. 11 is an explanatory diagram of the operation of the adjusting screw 20, and FIG. 11a is a diagram showing the relative positions when the eccentric shaft 20a of the adjusting screw is positioned vertically below the center of the screw. When the adjusting screw 20 is rotated counterclockwise, since the eccentric shaft 20a formed at the tip of the adjusting screw 20 is eccentric from the center of the screw shaft of the adjusting screw 20, the lever A, 14a is rotated on the outer peripheral surface of the eccentric shaft 20a. Pressing the side surface 14f of
Lever A, 14a rotates counterclockwise about axis A, 17a, and assumes the position shown in FIG. 11b. It can be seen that the distance dimension X can be adjusted to a predetermined value using the adjustment screw 20. The levers B and 14b operate in the same manner.

By providing the adjustment screw 20, the levers A and 14a cannot be moved clockwise due to their standard positions, but the levers A and 14a are able to withstand shocks directed from left to right in arrow C in Figure 1. Since it is a physical object, it is sufficient to move only in the counterclockwise direction. For impacts directed from the right to the left, the levers B and 14b perform the same function as the levers A and 14a, as described above.

As described above, in this invention, the distance between the lever in contact with the eccentric shaft of the adjustment screw and the actuating plate can be adjusted by rotating the adjustment screw, making it possible to reliably prevent malfunctions caused by shocks and provide reliable operation. A device for preventing erroneous loading with high performance can be obtained.

[Brief explanation of the drawing]

Figures 1 to 6 show a conventional erroneous loading prevention device, where Figure 1 is a bottom view, a sectional view of Figure 2, and
The figure is a bottom view, Figure 3 is a right side view of Figure 2, Figure 4 is a front view and side view of the actuating plate, Figure 5 is a left side view of Figure 3, and Figure 6 is a left side view of Figure 3. - Sectional view, 7th
Figures to Figures 10 show an embodiment of this invention. Figure 7 is an enlarged view of the main part corresponding to Figure 3 of the conventional example, Figure 8 is a left side view of Figure 7, and Figure 9. is a sectional view of FIG. 7, FIG. 10 is a diagram showing the adjustment screw, and FIG. 11 is an explanatory diagram showing the operation of the adjustment screw.
a indicates always, and b indicates during adjustment. In addition, the same reference numerals in the figures indicate the same or equivalent parts, 1 is an electromagnetic switchgear, 7 is an electromagnetic coil, 8 is a movable core, 10 is an actuation plate, 14a, 14b are levers A, B, 15a, 15b are torsion springs. A, B, 1
6a and 16b are mounting plates A and B, 20 is an adjustment screw,
20a is an eccentric shaft.

Claims (1)

[Claims for Utility Model Registration] A movable core that is attracted by the energization of an electromagnetic coil, an actuating plate connected to the movable core, and a movable core that is rotatably supported by a mounting plate and that rotates in a predetermined direction with respect to the movable core. A device for preventing incorrect closing of an electromagnetic opening/closing device, comprising a lever configured to rotate by the impact force when an impact load is applied and prevent the movement of the operating plate by abutting the operating plate against the end face. , a spring that biases the lever to return to a position where the distance between the end face and the operating plate becomes a predetermined distance, and a spring rotatably provided on the mounting plate and attached to a side surface of the lever. and an adjustment screw having an eccentric shaft with which the outer peripheral surface contacts, and the lever is rotatable on the mounting plate so as to rotate against the biasing force of the spring when an impact load in the predetermined direction is applied. The electromagnetic opening/closing device is supported by an electromagnetic opening/closing device, and by rotating the adjusting screw, the return position of the lever is changed by the eccentric shaft, and the distance between the end face of the lever and the operating plate is adjusted. Device to prevent incorrect loading of equipment.