JP2598890B2 - Interlock devices such as shears and breakers - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interlock device used for an operation mechanism of a switching device such as a circuit breaker, a switch, and a disconnector (hereinafter, referred to as a circuit breaker or the like).

Conventionally, as this type of apparatus, there is an apparatus having a configuration shown in FIG. FIG. 1 shows an interlocking device for a ladder or a breaker, wherein (1) is a closing cam and a crankshaft (2).
, And is rotatable only in a counterclockwise direction about a crank shaft (2) by a driving device (not shown) around the crank shaft (2). (4) is a cam roller, which is fixed inside the input cam (1).
(5) is a main link, which is in contact with the input cam (1) via the roller at the tip, and transmits the movement of the input cam (1) to the link mechanism (6). The link mechanism (6) converts the movement of the main link (5) into an opening and closing operation to open and close the main contact (7). (8) is a lever, and an open / close indicator pin (9)
When the main contact (7) is open, the open / close indicator pin (9) is set at the position a. When the main contact (7) is closed, the open / close indicator pin (9) is connected. 9) is moved to the position of b. Reference numeral (10) denotes a loading support, which is rotatably mounted on the shaft (11) and contacts the cam roller (4) to support the loading cam (1) from rotating. A spring (12) is mounted between the loading support (10) and the fixed shaft (13), and holds the contact between the loading support (10) and the cam roller (4) so as not to come off. (14) is an input button, which is rotatably attached to the shaft (15). The shaft (15) is fixed to the side plate (3). (16) is a closing clutch, which is rotatably mounted on the shaft (17). The shaft (17) is mounted on the input button (14). (18) is the closing lever,
It is rotatably mounted on the shaft (19), and one end contacts the input clutch (16), and the other end contacts the input support (10). To communicate. The shaft (19) is fixed to the side plate (3).

Next, the operation will be described. In FIG. 1, when the main contact (7) is in an open state, the open / close indicator pin (9) is set to a.
In the position. At this time, when the input button (14) is pressed, the input button (14) rotates counterclockwise about the axis (15). Since the shaft (17) moves together with the movement of the input button (14), the input clutch (16) rotates clockwise around the contact point with the input lever (18), and the opening / closing indicator pin (9) Contact. Since the open / close indicator pin (9) is fixed by the lever (8), the closing clutch (1)
6) rotates the closing lever (18) clockwise about the shaft (19) with the contact point with the open / close indicator pin (9) as a fulcrum. The closing lever (18) transmits the force received from the closing clutch (16) to the closing support (10), rotates the closing support (10) counterclockwise against the force of the spring (12), and rotates the cam roller ( 4) Release contact between the loading support (10). This state is shown in FIG. Since the contact between the cam roller (4) and the input support (10) is released, the input cam (1) is rotated counterclockwise around the crank shaft (2) by the force of the input spring (not shown). And the main contact (7) is closed through the main link (5) and the link mechanism (6). That is, the state transits to the main contact closed state and the closing spring released state. At this time, the open / close indicator pin (9) moves from a to b.

This state is shown in FIG. 3 (however, the positional relationship among the closing clutch (6), the closing lever (18), and the closing support (10) is kept in the closed setting state for convenience).

In the closed state of the main contact and the released state of the closing spring shown in FIG. 3, the closing cam (1) is moved to 18 by a driving device (not shown).
The cam roller (4) and the loading support (10) are brought into contact with each other by rotating it counterclockwise strongly by 0 ° (the loading reset state). At this time, the loading cam (1), loading support (10) and main link (5)
Is as shown in FIG. 4, and the main contact (7) maintains the closed state. In the closed state of the main contact (7), when the contact between the cam roller (4) and the loading support (10) is released, that is, when double loading is performed, the loading cam (1) is deflected by a loading spring (not shown). Since the main link (5) rotates clockwise and moves in contact with the input cam (1), there is a state in which the main link (5) enters the recess of the input cam (1) (first).
See figure). As a result, the position of the main link (5) changes,
Through the link mechanism (6), the main contact (7) is changed from the closed state to the open state and then to the closed state again, causing an undesirable phenomenon such as damage to the main contact (7). In order to prevent this inconvenience, as shown in FIG. 4, when the main contact (7) is in the closed state, the open / close indicator pin (9) is at the position b, and the closing clutch (16) is pressed even if the closing button (14) is pressed. ) Rotates clockwise about the contact point with the closing lever (18) and does not rotate the closing support (10) counterclockwise through the closing lever (18), so that the closing support (10) and the cam roller ( The contact of 4) is maintained, and so-called double throw is prevented.

Since the conventional interlocking device for preventing double insertion is configured as described above, the main link (5) and the input cam (1) are separated by the tripping mechanism (not shown) (tripping state). When the closing button (14) is kept pressed by a closing spring releasing interlock or the like (not shown) while maintaining the state, the open / close indicator pin (9) is brought into the state shown in FIG. In this state, when the closing spring (not shown) is urged by the driving device (not shown), the closing support (10) and the cam roller (4) do not come into contact with each other.
The closing cam (1) is rotated 180 ° counterclockwise by a closing spring (not shown). At this time, since the trip state is established, the movement of the closing cam (1) is not transmitted to the link mechanism (6), and a so-called trip-free phenomenon occurs in which the main contact (7) does not enter a closed state. And a driving device (not shown)
If the operation of (1) is not canceled, the closing spring (not shown) is charged again, causing a so-called pumping phenomenon that repeats trip-free operation, causing a serious damage to the crankshaft (2) and the like. In most cases, the pumping phenomenon is caused by an erroneous operation. Particularly, when the circuit breaker is pulled out without turning off the control power, as shown in FIG. And the closing spring is energized by the motor, so that a pumping phenomenon occurs. This has the disadvantage of severely damaging the operating mechanism of the circuit breaker.

Therefore, an object of the present invention is to prevent the above-described pumping phenomenon and prevent the crankshaft and the like from being significantly damaged.

Hereinafter, the configuration of an embodiment of the present invention will be described with reference to FIG. In the figure, reference numeral (20) denotes a crank, which is fixed to the crank shaft (2). (21) is a closing spring, which is connected between the fixed shaft (22) and the crank (20).
A trip mechanism (23) has a function of maintaining contact between the main roller provided at the upper end of the main link (5) and the input cam (1). Reference numeral (24) denotes a closing button, which is rotatably mounted on the shaft (25), and turns counterclockwise when pressed by hand or by a closing spring releasing interlock (not shown) in the direction of arrow P. Be moved. (26) is a closing button return spring, which is attached to the closing button (24) so that when the closing button (24) rotates counterclockwise about the shaft (25), it returns to the original position. I have. (27) is a double throw prevention plate,
It is fixed to the shaft (28). Axis (28) is the input button (2
4), and the double throw prevention plate (27) is
8) It is attached so that it can rotate around the center. A holding spring (29) is attached to the double throw prevention plate (27) so that the double throw prevention plate (27) rotates clockwise. (30)
Is a loading support, which is mounted on the shaft (25). A pin (31) is fixed to the loading support (30) and transmits the movement of the double loading prevention plate (27) to the loading support (30).

Next, the operation will be described with reference to FIGS. When the main contact (7) is in the open state and the closing spring is in the energized state, the main link (5) is in the reset position as shown in FIG. 5, and the double closing prevention plate (27) is mainly held by the holding spring (29). It is in contact with link (5). At this time, when the input button (24) is pressed from the point P, the input button (24) rotates counterclockwise about the axis (25). With the rotation of the input button (24), the shaft (28) rotates around the axis (25), and the double input prevention plate (27) rotates clockwise around the contact point with the main link (5). While contacting the pin (31). Further, when the input button (24) is pressed from the point P, the double input prevention plate (27) pushes the pin (31), so that the input support (30) moves counterclockwise around the shaft (25). Rotate, as shown in Figure 6,
When the input support (30) is disengaged from the cam roller (4), the input cam (1) is released by the release of the input spring (21).
Rotates about 130 degrees counterclockwise to close the main contact (7) through the main roller, main link (5) and link mechanism (6). That is, the closing spring (21) is first released, and then the main contact (7) is closed. This state is substantially the same as the main contact closed state and the closing spring released state shown in FIG. 3 relating to the conventional interlock device of the circuit breaker (however, the correspondence relationship between the closing cam position and the main link position is not shown). In order to make it easier to see, the paper itself in FIG. 3 must be rotated 90 degrees clockwise). In this state, the fixed shaft (22), the closing spring (21), the crank (20) and the crankshaft (2) are all located on one straight line.

When the main contact (7) is closed and the closing spring (21) starts from the released state, the closing cam (1) is moved counterclockwise by about 230 degrees.
When the closing spring (21) is extended by rotating it about a degree, the closing spring (21) is in an energized state while the main contact (7) remains closed.

When the main contact (7) is in a closed state and the closing spring (21) is in an upright state, the main link (5) is in a position as shown in FIG.
The double throw prevention plate (27) is held at a position as shown in FIG. 7 by a holding spring (29). At this time, the input button (24)
When the button is pressed from point P, the input button (24)
Rotate counterclockwise around. The shaft (28) rotates around the shaft (25) with the rotation of the input button (24). However, due to the tension of the holding spring (29), the double throw prevention plate (2
7) rotates in the clockwise direction about the axis (28), so that the state shown in FIG.
Does not contact the pin (31). Accordingly, since the engagement between the loading support (30) and the cam roller (4) is not disengaged, the rotation of the loading cam (1) is prevented, and so-called double loading is prevented.

Next, the operation of pumping prevention will be described. First,
FIG. 5 shows the state of the tripping state and the state of holding the closing spring and the state where the closing button is not pressed, so that the roller at the tip of the main link (5) is in the recess of the closing cam.

FIG. 6 shows a state in which the closing button is pressed from the state of FIG. 5, and a state immediately before the closing cam starts rotating by the closing spring (21).

FIG. 7 shows a state in which the closing spring is urged again in the closing state.

FIG. 8 shows a state in which the input button is pressed in the state of FIG.

FIG. 9 shows a state in which the closing spring is urged in a state where the closing button is pressed first in the open state, and the roller is out of the recess when the main link comes into contact with the double closing preventing plate. . Under the conditions shown in FIG. 5, when the tripping mechanism (23) is tripped (in a tripped state), the main link (5) is pulled toward the tripping mechanism by the reset mechanism included in the tripping mechanism 23. That is, since the roller of the main link (5) is pulled so as to come into contact with the input cam (1), the main link (5), the double input prevention plate (27), the input button (24), the input support ( The positional relationship 30) maintains the state shown in FIG.
At this point, when the input button (24) is pressed, the input cam (1) rotates counterclockwise as shown in FIG. (6) The movement of the cam (1) is not transmitted, and the main contact (7) is not closed. Causes so-called trip-free.

When the input cam (1) is rotated counterclockwise, the roller at the upper end of the main link (5) is pushed outward from the recess of the input cam (1), so that the main link (5) is rotated. The upper end moves in the lower left direction, and the double insertion prevention plate (27) is further rotated clockwise, so the double insertion prevention plate (27)
The engagement relationship between the upper end of the pin and the pin (31) of the input support (30) is disengaged, and the input support (30) is connected to the input button (24) and the input support as shown in the position of FIG. (30) This is the position of the double throw prevention plate (27).

Therefore, for example, when the closing spring (21) is pushed while the closing button (24) is pressed by operating the closing spring releasing interlock (not shown), the state shown in FIG. Perform trip-free operation and support throwing (30)
The engagement relationship between the and the double throw prevention plate (27) is disengaged as described above, and becomes as shown in FIG.

Note that if the state is changed to the tripping state in the state of FIG. 7, the state returns to the state of FIG. Further, when the trip state is set in the state of FIG. 8, the state becomes as shown in FIG. That is, the engagement between the double throw prevention plate (27) and the throw support (30) is disengaged before the throwing force of the throwing spring (21), and in this state, the throwing force of the throwing spring (21) is performed. Therefore, in the state in which the stocking is completed, the main link (5) does not reset by hitting the double insertion prevention plate (27), and the engagement between the insertion support (30) and the cam roller (4) is not released. The closing spring is not released. Therefore, a so-called pumping phenomenon is prevented.

Next, in FIG. 9, when the release button (24) is no longer pressed, the release button return spring (26) rotates the release button (24) clockwise about the shaft (25) to return. The axis (28) rotates clockwise about the axis (25). By this rotation, the double loading prevention plate (27) is moved by the loading spring (21) to the cam roller (4) and the loading support (30).
The drag at the contact portion with the pin (31), which occurs because the input support (30) becomes difficult to move due to the coupling force with the spring (2)
The main link (5) is tripped by the drag of (9).
Move away from the closing cam (1) against the reset spring inside 3). At this time, the double insertion prevention plate (27) and pin (3
When the contact of 1) comes off, the reset spring inside the trip mechanism (23)
The main link (5) acts in the direction of bringing the main link (5) into contact with the closing cam (1) against the force of rotating the double closing prevention plate (27) of the holding spring (29) clockwise. It is possible to return to the reset state as shown in FIG.

In the above-described embodiment, the case of the wire breaker has been described.
As long as it is of the cam input type, a disconnecting switch or another opening / closing device may be used, and the same effects as those of the above embodiment can be obtained.

As described above, according to the present invention, in the tripping state of a sword, a breaker, or the like, when the state where the input button is pressed is maintained, the input support is configured not to come off, so that the pumping phenomenon is prevented, Since the amount of impact applied to the operation mechanism can be reduced, there is an effect that the life of the operation mechanism is lengthened and the reliability is improved.

[Brief description of the drawings]

FIG. 1 is a structural view of a conventional double throw preventing device, FIGS. 2, 3, and 4 are structural diagrams showing the operation of the conventional double throw preventing device, and FIGS. It is a block diagram which shows operation | movement of one Example of invention. In the figure, (1) is the input cam, (2) is the crank shaft,
(3) is a side plate, (4) is a cam roller, (5) is a main link, (7) is a main contact, (20) is a crank, (21) is a closing spring, (22) is a fixed shaft, and (23) is Tripping mechanism, (24) is a closing button, (25) is a shaft, (26) is a closing button return spring, (27) is a double closing prevention plate, (28) is a shaft, (29) is a holding spring, 30) is a loading support, and (31) is a pin. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Claims] An input button rotatably supported by a fixed shaft; and an input support rotatably supported by the fixed shaft, supporting the rotation of the input cam, and maintaining a biased state of the input spring. A main link for transmitting the movement of the input cam to a link mechanism for opening and closing a main contact; a trip mechanism for maintaining contact between a roller provided at an upper end of the main link and the input cam; One end has an engaging surface that can be engaged with and disengaged from a pin provided on the loading support, and the other end engages with the main link. A double insertion prevention plate that transmits the movement of the input button to the input support in accordance with the position where the roller of the main link enters the recess of the input cam, and that allows the input spring to be released. It is stretched between the other end of the double throw prevention plate and the fixed point to prevent the double throw prevention. And a holding spring for urging the main link in a predetermined rotation direction. In the tripped state of the trip mechanism, the main link is pulled toward the trip mechanism, and the main link and the link mechanism are disposed between the main link and the link mechanism. When the movement of the closing cam is not transmitted, and the holding spring is in the main contact open state where the tripping mechanism is in the tripped state, and in the closing button operation state, the position of the double closing prevention plate is previously determined. Said 2
By keeping the double throw prevention plate at a position where the movement of the throw button cannot be transmitted to the throw support, the double throw prevention plate can be held even when the throwing spring is biased. An interlock device, such as a slasher or a breaker, wherein the movement of the input button cannot be transmitted to the input support.