JPS6217960Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a malfunction prevention device for a contactor, such as a malfunction prevention device for preventing contactors used in cranes, ships, etc. from malfunctioning due to impact. .

Conventionally, there have been devices of this type as shown in FIGS. 1 and 2. FIG. 1 is a partially sectional front view of the above device, and FIG. 2 is a bottom view of FIG. 1. In the figure, 1 is an electromagnetic contactor, 2 is a connecting rod connected to a movable part of this electromagnetic contactor 1 (for example, a crossbar of a movable contact, etc.), and this connecting rod 2 is an electromagnetic contactor 1.
By opening and closing the coil, it reciprocates in the direction of arrow A in the figure. Reference numeral 3 denotes a lever, which is connected to the connecting rod 2 by a shaft 4, has one end rotatably supported by a lever support 5, and has a lever receiver 6 provided at the other end. 7 is the coil of the malfunction prevention device, 8
is a movable core, which is normally held in a protruding state by the biasing force of a push spring 9, and a latch portion 8a of the movable core 8 is engaged with the lever receiver 6. 10 is a movable iron core 8
The tip 10a of the support plate is fixed to the support plate, and the tip 10a presses the pressing portion 11a of the auxiliary switch 11 to keep this contact open at all times. 12 is a yoke plate; 13 is a mounting plate for fixing the yoke plate 12 and the lever support 5;

In the electromagnetic contactor malfunction prevention device configured as described above, the lever receiver 6 is connected to the latch portion 8a of the movable core 8 which is biased leftward in the figure by the push spring 9.
Since the connecting rod 2 is engaged with the connecting rod 2, the connecting rod 2 is not pushed upward. However, when an external impact is applied to this device, especially an impact in the left-right (X-axis in the figure) direction, the impact force causes the movable core 8 to overcome the biasing force of the push spring 9 and move away from the lever receiver 6 in the left-right direction. Since it moves, the lever receiver 6 is no longer locked. If an impact is applied in the vertical (Z-axis in the figure) direction at the same time, the connecting rod 2 will move upward together with the lever 3, causing the electromagnetic contactor 1 to malfunction.

This invention was made in order to eliminate the above-mentioned drawbacks, and when an external impact is applied to the malfunction prevention device, it prevents the movable core from moving and prevents the contactor from malfunctioning. The aim is to obtain a malfunction prevention device with high performance.

The present invention has been made to achieve the above object, and consists of a lever whose one end is rotatably fixed on a shaft and whose approximately central portion is connected to the movable part of the electromagnetic contactor, and a lever disposed inside the coil and connected to the movable part of the electromagnetic contactor. In a malfunction prevention device consisting of a movable iron core in which the other end of the lever is engaged in an open state and detached by excitation of a coil in a closed state, and a support plate attached to the movable iron core via a spring, A plurality of stoppers are provided that are rotatably fixed to the mounting plate and have a center of gravity downward, and are rotatably fixed to the mounting plate so that the contact distance with the support plate is constant, and a spring is installed between the stopper and the shaft. When an external impact force is applied, at least one of the plurality of stoppers is rotated clockwise and the other stoppers are rotated counterclockwise, and one end of the stopper is supported at a fixed angle. The object of the present invention is to provide a malfunction prevention device in which each of the support plates is brought into contact with the support plate.

An embodiment of this invention will be described below with reference to the drawings. Figure 3 is a partial cross-sectional view of the electromagnetic contactor malfunction prevention device according to this invention, Figure 4 is a bottom view of Figure 3, Figures 5 and 6 are detailed views of the main parts, and Figure 7 is a side view. In these drawings, the same reference numerals as those in FIGS. 1 and 2 indicate the same or corresponding parts, so the explanation will be omitted. 14 and 15 are stoppers, and pins 18 and 1 are provided on the mounting plates 16 and 17, respectively.
When the stoppers 14 and 15 are rotatably supported by the stopper 9 and rotated by applying an impact force,
The contact portions 14a, 15a of the stoppers 14, 15 are configured to contact the end face portion of the support plate 11, and not to contact when in the normal position (position where no impact force is applied).

That is, the support plate 10 is approximately L-shaped, and the contact portions 10b, 10 at both ends in the lower horizontal direction
c (Fig. 7), the stopper 14 is upwardly moved,
The stopper 15 is positioned below. Reference numeral 20 denotes a torsion spring for returning the stopper 14 to its normal position, and is provided so as to sandwich a pin 21 attached to the stopper 14 and a pin 22 attached across the mounting plates 16 and 17. Reference numeral 23 denotes a torsion spring for returning the stopper 15 to its normal position, which is attached to the stopper 15 and is provided so as to sandwich the pins 24 and 22. Note that the stoppers 14 and 15 are
To speed up the response when impact force is applied,
The center of gravity is formed in the lower part, and the elastic force of the torsion springs 20 and 23 causes them to respond faster than the response of the movable iron core 8 when an impact force is applied.
The elastic force is selected to be smaller than the elastic force of the push spring 9.

In FIGS. 5 and 6, the dashed line indicates the normal position of the stoppers 14 and 15, and the solid line indicates the stopper 1 moved by the impact in the left and right direction.
4 and 15 are shown.

Next, the operation when an impact is applied to this malfunction prevention device will be explained. When an impact is applied to this device in the left-right (X-axis in the figure) direction, the impact force causes the movable core 8 to spring against the push spring 9, as in the conventional device.
attempts to overcome the urging force and move to the right away from the lever receiver 6. However, at this time, the stopper 14 rotates counterclockwise about the pin 18 against the biasing force of the torsion spring 20 faster than the movement of the movable iron core 8, and the abutting portion 14 of the stopper 14 rotates counterclockwise.
Since the movable iron core 8 comes into contact with the support plate 11 (see FIG. 5), movement of the movable iron core 8 to the right is prevented. Furthermore, when an impact force is applied that moves the movable core 8 to the left as it approaches the lever receiver 6, the movable core 8 collides with the lever receiver 6 and is immediately moved to the right by the counterattack force. However, at this time, the stopper 15 is rotating clockwise around the pin 19, and the abutting portion 15a of the stopper 15 and the support plate 11 abut (see FIG. 6), so that the movable iron core 8 is moved to the lever. Movement to the right away from the receiver 6 is prevented.

By preventing the movable core 8 from moving to the right in this way, the latch portion 8a of the movable core 8
The engagement between the lever receiver 6 and the lever receiver 6 is never released.

In the above embodiment, the case where the return force for returning the stopper to the normal position is applied by a torsion spring is shown, but for example, a leaf spring may be disposed between the stopper and the fixed part of the malfunction prevention device, An elastic body whose elastic force is smaller than the elastic force of the pressing spring that presses the movable iron core when the stopper moves, such as when the stopper is returned to its original position by this elastic force or when the end of the stopper is suspended from both sides by a coil spring. It may be restored by

Also, when the above device is normally loaded,
The movable iron core 8 moves to the right in the figure (in the direction away from the lever receiver 6) due to the excitation of the coil 7 of the malfunction prevention device.
However, in a normal state where no shock is applied, the stoppers 14 and 15 are arranged at positions where they do not come into contact with the movable iron core 8, so the stoppers 14 and 15 do not get in the way. do not have.

By the way, some of the electromagnetic contactor malfunction prevention devices described above are equipped with a self-holding circuit as shown in FIG. In this circuit, when the pushbutton switch PB is pressed, the malfunction prevention device coil MCC is excited and activated, and then, with a slight response delay, the magnetic contactor coil MCH is activated. Therefore, the movable iron core 8 moves to the right in the figure, and the lever receiver 6, which is disengaged from the latch portion 8a, moves upward via the connecting rod 2 due to the excitation of the coil MCH of the electromagnetic contactor. Moving. At this time, the contacts of the electromagnetic contactor
When MCH1 is opened, the malfunction prevention device coil MCC
is de-energized, but since the movable core 8 comes into contact with the lever receiver 6 that is moving upward and is prevented from returning, the tip of the support plate 10 that is moving to the right in the figure along with the movable core 8 The portion 10a releases the pressing portion 11a of the auxiliary switch 11. Therefore, the contact point LS of the auxiliary switch 11 (see Fig. 8)
continues in the closed state, and the electromagnetic contactor 1 continues to be excited.

In a malfunction prevention device equipped with a self-holding circuit configured as described above, shocks, especially left and right (X in the figure)
When an impact is applied in the axial direction, the supporting plate 10 moves away from the lever receiver 6 together with the movable iron core 8, that is, the pressing portion 11a of the auxiliary switch 11 moves away from the lever receiver 6.
move in the direction where it is no longer pressed, and this tip 10
Auxiliary switch 11 which was pressed by a and was in the open state
The contact becomes a closed circuit. This is a push button switch
This is not desirable as it is the same action as pressing PB (see Figure 8).

In order to prevent the above-described malfunction, it is sufficient that the tip 10a of the support plate 10 continues to press the pressing portion 11a of the auxiliary switch 11 except when the electromagnetic contactor is operating. In other words, it is only necessary that the movable core 8 to which the support plate 10 is attached is prevented from moving even in response to an impact, and the above-described device is configured to completely prevent the movable core 8 from moving in response to an impact. Therefore, this drawback can also be eliminated at the same time.

In addition, the stopper 14 that comes into contact with the support plate 10,
15 abutting portions 14a, 15a respectively with pins 18
and 19, when the stoppers 14, 15 rotate about the pins 18, 19, the abutting portions 14a, 1
The distance to 5a becomes constant, and the stopper 14,
The rotation angle 15 has the effect of preventing the motion prevention of the support plate 10, that is, the malfunction prevention operation from becoming inconsistent, and making it possible to obtain a constant malfunction prevention effect.

Further, in the above embodiment, the stoppers 14, 15
Although the case where the movable iron core 8 is prevented from moving via the support plate 10 has been described, the stoppers 14 and 1
5 may come into direct contact with the movable core portion to prevent this movement.

The following effects were obtained by this invention.

(1) Even if a shock is applied to the contactor from the outside, the malfunction prevention device can now function reliably.

(2) Malfunction prevention devices equipped with a self-holding circuit can also prevent malfunctions of the on-contact points for the self-holding circuit.

[Brief explanation of the drawing]

Figure 1 is a partially sectional front view showing a conventional malfunction prevention device, Figure 2 is a bottom view of Figure 1, and Figures 3 to 7.
Each figure shows an example of this invention.
Figure 3 is a partially sectional front view, Figure 4 is a bottom view of Figure 3, Figures 5 and 6 are front views of main parts, Figure 7 is a side view of main parts, and Figure 8 is a malfunction prevention device. 2 is a circuit diagram of a self-holding device provided in In the figures, the same symbols indicate the same or equivalent parts, 1 is an electromagnetic contactor, 2 is a connecting rod, 3 is a lever, 6 is a lever receiver, 7 is a coil, 8 is a movable iron core, 9 is a pressure spring, and 10 is a support. board, 11 is an auxiliary switch, 14, 15 are stoppers, 18, 19, 2
1, 22, and 24 are all pins, and 20, 23 are torsion springs.

Claims (1)

[Scope of utility model registration request] A lever that is rotatably fixed at one end and connected to the movable part of the electromagnetic contactor at its almost central part, and the other end of the lever is placed inside the coil and is engaged when the electromagnetic contactor is in the open state, and the lever is in the closed state. Now, in a malfunction prevention device consisting of a movable core that is detached by excitation of the coil and a support plate attached to the movable core via a spring, the contact distance with the support plate is fixed. A plurality of stoppers are provided that are rotatably fixed to the mounting plate and are approximately L-shaped and have a center of gravity downward, and a spring is interposed between the stopper and the shaft to support each stopper at a fixed angle. When an external impact force is applied, at least one of the plurality of stoppers is rotated clockwise and the other stoppers are rotated counterclockwise so that one end thereof is brought into contact with the support plate. A malfunction prevention device characterized by: