JPS6124110A - Operating mechanism of switching device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an operating mechanism for opening and closing a switching device such as a circuit breaker or a switch.

[Prior art]

Figures 1 to 3 are side sectional views showing an example of a conventional operating mechanism, with Figure 1 showing the open circuit state of this switching device, Figure 2 the closed state, and Figure 3 the opening operation. Each shows the state inside.

In the figure, (1) is a fixed contact, (2) is a movable contact that connects and separates from the fixed contact (1) to open and close the electric circuit, and (3)
) is the pole shaft and the ball lever (4)! Moving levers (5) are arranged and fixed on the shaft at predetermined intervals. (6) connects the ball lever (4) and the movable contact (2) so as to be rotatable, and transfers the opening/closing force from the pole shaft (3) to the movable contact (2).
Insulation Rondo transmitted to (7) Fi said Ballet/<
- a release spring (8) disposed between one end of (4) and a frame (not shown) to urge the pole shaft (3) clockwise; ) via a bottle (9), and the other end holds a roller (lO) via a bottle (11), the main link (12) is attached to the crankshaft (13) and its outer edge a charging cam (14) provided with a portion in contact with the roller (10);
is a fixed shaft (15) and a tripping cam attached to the K shaft (16).
is a connecting link whose one end is pivotally connected to the tripping cam (14) via a bottle (17), and the other end is pivotally attached to the main link (8) via the bottle (11); ) is a roller pivotally attached to the tripping cam (14) via a pin (19), and (20) is a latch that is pivotally attached to the fixed shaft (21), one end of which engages and disengages from the roller (18). , (22
) is a fixed shaft (23) K-axis mounted, one end of which is engaged with the latch (20), and (24) is an electromagnet for tripping command, the drive shaft (24a) of which is attached to the above-mentioned latch (20). It is provided to engage with one end of the trigger (22).

Next, the operation will be explained. FIG. 1 shows the reset state in the enclosed state. In Fig. 1, when a closing command is output, a closing drive device (not shown) is activated by a crankshaft (
13) and the input cam (12) attached thereto are driven counterclockwise. As the input cam (12) rotates, the roller (10) provided in contact with the outer edge of the input cam (12) is driven in a direction away from the crankshaft (13). Connecting link (16)
Since it is connected to the tripping cam (14) via, it performs an arcuate movement counterclockwise around the bottle (17). For this reason, the main link (
8) The driving force is transmitted to the pole shaft (3) via the drive lever (5), and the pole shaft (3) is rotated counterclockwise. As the shaft (3) rotates counterclockwise, the ball lever/(-(4)) fixed to the ball lever 7) (3) and the insulator connected to the ball lever (4) The movable contact (2) is driven toward the fixed contact (1) via the iron (6), and the surface contacts (1) and (2) are closed. With this series of operations, the ball lever (4) is driven toward the fixed contact (1). ) a release spring (7) attached to one end of the
is stored. FIG. 2 shows a state in which this circuit closing operation is completed. When the enclosure command is given in FIG. 2, the electromagnet (24) is excited and the drive shaft (24a) is attracted upward in FIG. As a result, the trigger (22) provided in engagement with the drive shaft (24a) is driven clockwise and is disengaged from the latch (20). The latch (20) has a retaining portion with the roller (18) as shown in FIG.
21), it is constantly biased counterclockwise by the force caused by the release spring (7), and when the trigger (22) is disengaged, it rotates counterclockwise. roller (18) provided on the tripping cam (14);
The bond between the two is broken. By the way, since the ballshaft 7) (3) is biased clockwise by the release spring (7),
The roller (10) connected to the ball shaft 7) (3) via the main link (8) is located on the right side in Fig. 2 due to its relative position with the pole shaft (3) and the input cam (12). I am receiving a force that moves me towards. Therefore, the tripping cam (14) Fi connected to the main roller (lO) via the connecting link (16) is always subjected to rotational force in the counterclockwise direction when the circuit is closed. Latch (
20), it rotates counterclockwise.

The rotation of this tripping cam (14) causes the connection link (1
6), that is, the bottle (17) rotates to the right in FIG. As a result, the main roller (lO) is
The main roller (10
) moves to the right. Therefore, the ball shaft (3) is connected to the main roller (10) via the main link (8).
) rotates clockwise, and as the ball shaft (3) rotates, the movable contact (
2) is driven in the direction of opening. This state is shown in FIG. Thereafter, the tripping cam (14) and the latch (20) are rotated clockwise by respective biasing means (not shown) and reset to the state shown in FIG. 1.

As mentioned above, the drive device of the switchgear is usually constructed by combining four-bar links, and in the closing operation, the driving force is transmitted to the movable contact (2) via these four-bar links, and these four-bar links By keeping the node links in tension, the closed circuit state is maintained. Also, K causes the opening operation.
All that is required is to break the tension of a portion of the four-bar link, which is in tension, and as a result, the tension of the entire link system is broken and the movable contact (2) is driven in the opening direction by the opening spring.

By the way, as a means to break the above-mentioned tension state, conventional devices have used a configuration in which fixed nodes of a four-bar link are displaced. Specifically, the drive lever (5), the main link (
8) and a connecting link (16), one fixed node, ie, the pin (17), is provided on the rotatable tripping cam (14), and when opened, the /'i tripping cam (14) ) t-Turn counterclockwise to remove the bottle (17)
By moving the four-bar link to the right in FIG. 2, the tension state of the four-bar link was broken.

Therefore, according to the above configuration, as can be seen from FIG. 1 and FIG.
The load applied to the trip cam (
14) The counterclockwise rotational force applied to the point 14) also changed significantly. Furthermore, when moving from the locked state to the released state under load, such as the relationship between the tripping cam (14) and the latch (20), if a large load is applied to the locking part, the locking surface will be damaged. It is necessary to prevent the load applied to the above-mentioned retaining part from becoming large, since reliable operation cannot be performed due to the increase in the driving force or the increase in the driving force. 20), trigger (
The method used was to arrange parts such as 22) in series and gradually reduce the load. For this reason, the number of failures in the component parts increases, making the configuration complicated, and in order to ensure stable operation,
The drawback was that the assembly work required a great deal of labor.

[Summary of the invention]

This invention was made for the purpose of improving the disadvantage of bending, and a bendable node is provided in the transmission link connecting the driving lever and the driven lever, and the bending R of this node is set so that the bending radius is below a predetermined value. Supporting the transmission link with a support member
It is an object of the present invention to provide an operating mechanism for a switchgear that can perform stable operation with a simple configuration.

[Embodiments of the invention]

An embodiment of the present invention will be explained below.

4 to 6 are side sectional views showing an example of the operating mechanism of the present invention, FIG. 4 shows the open circuit state of this switching device, FIG. 5 shows the closed circuit state, and FIG. 6 shows the circuit opening operation. Show the state inside each.

In the figure, (25) is a driven lever installed on the ball shaft (3), and (26) is a driving lever that is fixed to a boss (27) at one end thereof, and the pole shaft is connected through this boss (27). (3) A rotatable example is attached. (28) is attached to one end of the driven lever (25) with a bottle (
a first link rotatably connected via (29);
0) has one end rotatably connected to the first link (28) via a pin (31), and the other end to the drive lever (2
6) via a bin (32),
A bottle (33) is located near the connecting portion with the first link (28).
It has a roller (34) pivotally supported by. Note that the first link (28) and the second link (3o)
The combined state is called a transmission link (35). (3
6) is a spring that biases the transmission link (35) in the straightening direction, and (37) is in contact with one end of the driven lever (25) and the driving lever (26), so that both the levers (
25) A stopper regulating the rotation range of (26), (3
8) #-1 protrusion (38a) and bottle (40) K on one end
It has a rotatably supported roller (41) and the other end has a fixed shaft (39).
) is a support member rotatably supported by a support member, and in a supported state, the body portion thereof comes into contact with the roller (33) to form a connecting portion between the first link (28) and the second link (3o). It is supported so that the bending angle of 9 is below a predetermined value. (
42) is a spring that biases the support member (38) counterclockwise; (43) is a latch, that is, a locking means that locks the support member (38) when the support member (38) is engaged with and engaged with the support member (38); A fixed shaft (44) K is rotatably supported and locks the support member (38) in a state in which its tip abuts against the roller (41). (45) is a latch (43)
Support member (38) and latch (43) with pins fixed to
When the latch (43) is engaged, the latch (43) is engaged with the protrusion (38a) to prevent the latch (43) from rotating beyond a predetermined value. (46) is the latch (
A trigger (47) is attached to the latch (43) and rotates clockwise together with the latch (43) when pushed by the operation of the drive shaft (24a) of the electromagnet (24). The spring (48) that urges the pin (33)
), the roller (49) is a fixed shaft (50); the roller (48) is rotatably supported;
A locking member (51) that engages and disengages with the locking member (49)
This is a spring that biases the counterclockwise direction. In addition, (1) to (
Since η is the same as in the conventional example, the explanation will be omitted.

Next, the operation will be explained. In FIG. 4, support member (38) //i is engaged with latch (43) to hold it in place. In this state, if a clockwise rotational force is applied to the drive lever (26) by means not shown,
This rotational force is transmitted via the transmission link (35) to the driven lever (
25). By the way, transmission link (35) l
d A node portion consisting of a pin (31) provided approximately at the center thereof is held in an upwardly bent state in FIG. Therefore, when transmitting the rotational force, the support member tries to bend further upward, but the roller (34) comes into contact with the body of the support member (38), and further bending movement is prevented. In this way, the transmission link (35) maintains a predetermined bending force and bending amount, and the drive lever (26)
The rotational force applied to the driven lever (25) is transmitted to the driven lever (25). When the driven lever (25) is rotated clockwise, the ball seat 7) (3) to which this driven lever (25) is attached
similarly rotates clockwise. As a result, the movable contact (2) is connected via the ball lever (4) and the insulating iron (5).
) is driven toward the fixed contact (1), and both the contacts (1
)(2) is closed. As a result of this series of operations, the release spring (7) attached to one end of the ball lever (4) is charged. Furthermore, by engaging the locking member (49) with the roller (48) in the closed state of both the contacts (1) and (2), a driving force is provided to urge the movable contact (2) in the contact closing direction. Even if the opening device is removed, the opening force of the opening spring (7) can be overcome and the opening device can be maintained in a closed state.

This state is shown in FIG. In FIG. 5, when an opening command is given to this switchgear, the electromagnet (24) is excited, the output shaft (24a) protrudes to the right, and the trigger (46)
Rotate clockwise. Therefore, the latch (43) to which the trigger (46) is attached also rotates clockwise at the same time and is disengaged from the roller (41).At this time, the driven lever (
25) receives the opening driving force from the opening spring (7) in the counterclockwise direction, and this force is transmitted to the drive lever (26) via the transmission link (35).

However, the drive lever (26) cannot be rotated because it is locked by the locking member [49] via the roller (48), and in the end, the opening driving force by the opening spring (7) is applied to the transmission link (35). A roller (34) that works to bend the
The support member (38) in contact with the support member (38) overcomes the biasing force of the spring (42) and is pushed upward. Furthermore, the driven lever (25
) overcomes the biasing force of the spring (36) and connects the transmission link (3
5) is rotated counterclockwise while being bent, and stops when the other end of the driven lever (25) contacts the stopper (37). This operation also drives the movable contactor (2) in the opening direction, opening the switching device.

Further, as the transmission link (35) bends, the second
1@ of the link comes into contact with the locking member (49) and pushes it down,
Release the engagement between the roller (48) and the locking member (49).

As a result, the drive lever (26) can be rotated counterclockwise, so that the transmission link (35) is bent at the same time as the driven lever (25) is rotated counterclockwise. The drive lever (26) also rotates counterclockwise. After that, when the driven lever (25) comes into contact with the stopper (37) and stops its rotational movement, the transmission link (35) moves straightly due to the biasing force of the spring (36), so that the driving lever (26) further Rotate counterclockwise.

Further, as the transmission link (35) extends and straightens, the force pushing the support member (38) upward also disappears, so the support member (38) rotates counterclockwise due to the biasing force of the spring (42). This rotation of the support member (38) causes the latch (43) to engage with the roller (41), completing the reset operation of this operating mechanism. This state is shown in FIG.

In the operating mechanism configured as described above, the transmission link (35) is configured such that the bending amount of the transmission link (35) is equal to or less than a predetermined value while operating from the reset position to the closed circuit position or while maintaining the closed circuit state. ) is supported by the support member (38), the number of parts is reduced, which simplifies the assembly work, and also improves the assembly accuracy between each component, resulting in a simple and stable structure. can perform actions.

In addition, according to the above embodiment, by configuring the latch (43) that locks the support member (38) to be detachable based on an external command, it is possible to prevent any accident from occurring during or during the circuit closing operation. If this occurs, the circuit can be easily opened.

In addition, during the circuit closing operation or in the closed circuit state, the driven lever (25), the drive lever (26) and the transmission link (35
) is supported by one support member (38) in each state in which the four-bar link is in tension, the structure is much simpler than a structure in which a support structure is provided for each state. It can be made into something. For safety reasons, it is necessary for this support member (38) to perform the above-mentioned support operation only when a circuit opening command is not issued.

Furthermore, if the driven lever (25) and the drive lever (26) are rotated around the same rotation axis,
In addition to simplifying the adjustment work, such as adjusting the axis center to make the rotation axes for both levers (25) and (26) parallel, the rotation axis is shared, so the overall structure can be made smaller. There is.

In addition, by placing a bendable node at one location approximately in the center of the transmission link (35), the force that holds this node can be reduced, and the node retention force due to manufacturing errors of the transmission link (35) can be reduced. The error can be reduced.

In addition, by bringing the transmission link (35) and the support member (38) into contact with each other via the roller (34), the friction loss associated with the operation of the operating mechanism is reduced, making the operation smoother, and the energy required for operation is also reduced. Can be made smaller.

Also, a support member (38) with which the transmission link (35) comes into contact
By making the abutment part of the transmission link (35) arc-shaped around the rotation axis, it is possible to eliminate changes in the amount of bending of the bendable nodes of the transmission link (35), so it is possible to keep the amount of bending small. Therefore, the supporting force applied to the supporting member (38) can be reduced.

〔Effect of the invention〕

As described above, the present invention provides a bendable node in the transmission link that connects the drive lever and the driven lever, and supports the transmission link with a support member so that the bending amount of the node is equal to or less than a predetermined value. This structure simplifies the assembly work by reducing the number of parts, and also improves the assembly accuracy between each component. This has the effect of providing an operating mechanism.

[Brief explanation of the drawing]

Figures 1 to 3 are side sectional views showing conventional operating mechanisms, with Figure 1 showing the open circuit state of the switchgear, Figure 2 the closed circuit state, and Figure 3 the middle of the enclosure operation. They are shown below. 4 to 6 are side sectional views showing an operating mechanism according to an embodiment of the present invention, in which FIG. 4 shows the opening/closing device in the open state, FIG. 5 shows the closed state, and FIG. indicate the middle of the encircling motion, respectively. In the figure, (2) is a movable contact, (3) is a pole shaft or drive shaft, (7) is a release spring, (25) is a U driven lever, (26) is a drive lever, (35) is a transmission link, ( 38) is a support member, (43) is a latch or locking means, and (49) is a locking member. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (6)

[Claims] (1) A drive shaft to which a movable contact is mounted and which rotates to drive the movable contact; and a drive shaft which is mounted to this drive shaft and rotates between first and second positions with the drive shaft as a rotation center. a driven lever; a drive lever rotatably supported on a shaft having an axis substantially parallel to the drive shaft; A transmission link having at least one bendable node between both connecting parts, and a removable locking means, which contacts the transmission link when in the locking position to stop the transmission. A support member that supports a bending amount of the link to a predetermined value or less, and the driven lever lock the drive lever or the transmission link in a predetermined position in a second position to hold the driven lever in the second position. An operating mechanism for an opening/closing device including a locking member and a spring that biases the driven lever toward a first position. (2) The operating mechanism for an opening/closing device according to claim 1, wherein the locking means for the support member includes a latch member that moves based on an external command. (3) The operating mechanism for an opening/closing device according to claim 1, wherein the driven lever and the drive lever rotate about the same rotation axis. (4) The operating mechanism for an opening/closing device according to claim 1, wherein the bendable node of the transmission link is provided at one location approximately in the middle of the connecting portions provided at both ends of the transmission link. (5) The operating mechanism for an opening/closing device according to claim 1, wherein the transmission link and the support member are brought into contact with each other via a roller. (6) The operating mechanism for an opening/closing device according to claim 1 or 3, wherein the contact portion of the support member that the transmission link contacts has an arc shape centered on the rotation axis.