JPH0624103Y2 - Remote control lock mechanism for switchgear - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention may cause a serious accident such as personal injury due to opening / closing operation of a device such as a disconnector or a grounding switch of a gas insulated switchgear during inspection of the device. It is concerned with the configuration of the locking mechanism that locks a certain switchgear so that the current switchgear state cannot be changed by any other operation other than the normal operation from the switchboard room of the electric station where the switchgear is installed. In more detail, a drive motor having a fuse on the power source side is used as a drive source, and is fixed to the lever tip end portion by a drive lever which is driven to rotate around the axis line by a power supplied from the drive source via a drive shaft. A compression opening / closing spring or a tension opening / closing spring, which is interposed or stretched between the point and the point, is energized so that the drive lever reaches the vicinity of the dead line connecting the center of the drive shaft and the fixed point. At this time, when the lock of the output shaft that opens and closes the main contact of the switchgear, which was locked to the open or closed position corresponding to the main contact of the switchgear, is released and the output shaft is crossed over the dead line. The present invention relates to a distant control stock mechanism configured to transmit the urging force of the biased opening / closing spring.

[Conventional technology]

FIG. 4 shows an example of the configuration of a conventional remote control lock mechanism of this type. The figure shows the state in the middle of operation of the locking mechanism when the closing operation is performed by the regular operation from the switchboard room. By this closing operation, the drive lever 3 that has been driven to rotate clockwise around the axis of the drive shaft 2 through the drive shaft 2 by the power supplied from the drive motor (not shown) to the position shown The compression opening / closing spring 10 interposed between the pin 13 at the tip of the drive lever 3 and the fixing point indicated by the pin 9 is compressed by the time of reaching The dead line connecting the point 9 and the center of the drive shaft 2 is slightly passed, and the releasing force of the compression opening / closing spring 10 is transmitted to the output shaft 1 via the pin 5. On the other hand, by the operation from the switchboard room, the remote control lock device 8 to which the control signal is given slightly before the position shown in the drawing,
The control shaft 7 is rotated 90 ° from the position shown in the drawing until the drive lever 3 reaches the position shown in the drawing, and the engaging portion 6a of the lock lever 6 fixedly mounted on the output shaft 1 moves the groove 7a at the end of the control shaft. The control shaft 7 is operated so that it can pass freely. As a result, the output shaft 1 to which the urging force of the compression opening / closing spring 10 is transmitted via the pin 5 is freely rotated in the clockwise direction to open the seed contact of the opening / closing device. The output shaft is locked to prevent the output shaft from starting to move unnecessarily due to friction with the drive shaft.

[Problems to be solved by the device]

The remote control lock mechanism of the switchgear is configured in this way, and the rotation operation of the control shaft 7 by the remote control lock device 8 is
By forming a signal system so that it is performed at a position immediately before the output shaft locking position of the drive lever 3 only during a normal operation from the switchboard room, the control shaft 7 can be operated by any other means. Since it does not occur immediately before the output shaft lock position, even if only the drive motor is started by mistake and the drive lever 3 is rotated, the output shaft 1 to which the urging force of the compression opening / closing spring 10 is transmitted is controlled. Rotation is blocked by the shaft 7, and the main contact of the switchgear cannot be opened or closed. As a result, the switchgear can always maintain the current state other than the normal operation, and can prevent the occurrence of a disaster due to an erroneous operation. Moreover, since the lock of the output shaft 1 causes an overcurrent to flow in the drive motor and the fuse on the power supply side of the motor operates, such an erroneous operation is not repeated.

However, on the other hand, at the position shown in the figure in which the rotation of the drive lever 3 is blocked, the drive lever 3 has already crossed the dead line connecting the fixed point 9 and the center of the drive shaft 2, so by any chance, for example, manually, When the control shaft 7 is rotated as shown in FIGS. 6 and 5, the lock of the output shaft 1 is released, and the output shaft rotates clockwise to open and close the switchgear. .

An object of the present invention is to provide a configuration of a remote control lock mechanism capable of maintaining a current open / closed state of a switchgear even if the control shaft is rotated by an erroneous operation.

[Means for Solving the Problems]

In order to solve the above problems, according to the present invention, a drive motor having a fuse on the power source side is used as a drive source, and the power supplied from the drive source is rotationally driven around the axis through a drive shaft. The drive lever urges a compression opening / closing spring or a tension opening / closing spring interposed or stretched between the lever tip and the fixed point, and the drive lever connects the center of the drive shaft with the fixed point. When reaching the vicinity, when the lock of the output shaft that opens and closes the main contact of the switchgear was released and crossed the dead line, which was locked to the open or closed position corresponding to the main contact of the switchgear. The remote control lock mechanism configured to transmit the urging force of the biased opening / closing spring to the output shaft by means of the lock position of the output shaft is set to the front side of the drive lever deadline and A groove in which the lock of the shaft is formed in the shaft or a member integrated with the shaft in the axial direction, a latch lever formed with a protrusion that engages with the groove, and a rotation in a direction in which the engagement of the latch lever is released. This is performed by a remote control lock device that has a control shaft with a blocking plate at its tip that blocks movement and that drives this control shaft in response to a command from a distance to enable rotation of the latch lever in the disengagement direction. The lock release of the output shaft is performed by controlling the remote control lock device so that the lock can be released, and by rotating the drive lever in the disengagement direction.

[Action]

By configuring the remote control lock mechanism in this way,
At the lock position of the output shaft, the drive lever has not yet crossed the dead line, and an excessive current flows to the drive motor due to overload due to the lock, causing the fuse on the power supply side of the motor to operate.
Even if the control shaft of the remote control lock device is accidentally rotated in the lock release direction because the power supply from the drive motor is stopped, the output shaft does not rotate and the switchgear does Stay in the state. Note that power transmission from the drive motor to the drive shaft is usually performed via a reduction mechanism using a worm / gear or screw rod / nut, and it is impossible to rotate the motor from the drive shaft side. The force of the opening / closing spring does not cause the spring to return to its starting position, and it remains stopped at this locking position. Further, in the present invention, since the projection for locking the output shaft is formed on the latch lever, the projection is formed near the fulcrum of the latch lever, and the blocking plate for blocking the rotation of the latch lever in the unlocking direction is provided. By setting the position of the control shaft to the far end of the latch lever, it is possible to reduce the force applied to the control shaft via the output shaft at the time of erroneous operation.
It is possible to make the control shaft, and thus the remote control lock device, compact.

〔Example〕

FIG. 1 shows an embodiment of a far-field locking mechanism structure according to the present invention. In the figure, the same members as those in FIG. 4 are designated by the same reference numerals and the description thereof is omitted. The pin 9 forming the fixed support point of the compression opening / closing spring 10 has an output lever in which the drive lever 3 is integrated with the output shaft 1.
The position at which the drive lever 3 is located on the front side of the dead line at the position where the pin 5 implanted in 14 starts to be pushed, that is, the lock position of the output shaft 1, is set. A groove 14a is formed in the output lever 14 in the axial direction of the output shaft 1, and a projection 15a that engages with the groove 14a is formed on the plate surface of the plate-shaped latch lever 15, and the latch lever 15 is always provided with a control shaft. A blocking plate 16 fixed to the tip of 17 holds the lower surface side so that it cannot rotate clockwise. During normal operation from the switchboard room, the drive motor rotates the drive lever 3 clockwise from its starting position to the position shown in the figure, and unlocks the drive lever 3 immediately before it reaches the output shaft lock position. Is transmitted to the remote control lock device 18,
Through the control shaft 17, the blocking plate 16 at the tip of the shaft is rotated from the position shown in FIG. 3 to the position shown in FIG. As a result, the drive lever 3 pushes the latch lever 15 downward against the spring 19 via another protrusion 15b formed on the latch lever 15, and releases the engagement between the groove 14a of the output lever 14 and the protrusion 15a of the latch lever 15. To do. As a result, the drive lever 3 continues to rotate by pushing the pin 5 after hitting the pin 5 of the output lever 14, and the compression opening / closing spring 10 is released when the output lever 14 crosses the dead line. Output shaft 1
To rotate the main contact of the switchgear at high speed.

However, if the operation of the switchgear does not depend on the normal operation from the switchboard room and only the drive motor circuit is utilized due to an erroneous operation, the remote control lock device 18 can be rotated so that the control shaft 17 can be unlocked. Since the signal for moving is not sent, the drive lever 3 cannot be rotated from the position shown in the figure, and at the same time, the power side fuse of the drive motor operates, so that the power from the drive motor is stopped and the drive lever 3 is stopped. Stops at the position shown. In this state, even if the control shaft 17 is erroneously operated to rotate, at this position the rotation lever 3
Is on the front side of the dead line and is biased in the counterclockwise direction by the compression opening / closing spring 10, so that the output shaft 1 does not rotate in the clockwise direction, and the switchgear maintains the current open / closed state.

[Effect of device]

As described above, according to the present invention, a drive motor having a fuse on the power source side is used as a drive source, and the drive power is supplied from the drive source so that the drive motor is driven to rotate about the axis through the drive shaft. A compression opening / closing spring or a tension opening / closing spring interposed or stretched between the tip of the lever and the fixed point is urged by the lever, and the drive lever reaches the vicinity of a dead line connecting the center of the drive shaft and the fixed point. When the output shaft that opens and closes the main contact of the switchgear that was locked to the open or closed position corresponding to the open or closed position of the main contact of the switchgear is released and exceeds the dead line, the output shaft A remote control lock mechanism configured to transmit the urging force of the biased opening / closing spring to a lock position of the output shaft and a lock position of the output shaft. A groove formed in the shaft or a member integrated with the shaft in the axial direction, a latch lever formed with a protrusion that engages with the groove, and rotation of the latch lever in a direction in which the engagement is released. The output shaft is provided with a remote control lock device which has a control shaft having a blocking plate at its tip and rotationally drives this control shaft in response to a command from a remote place to enable rotation of the latch lever in the disengagement direction. The lock is controlled by the remote control lock device so that the lock can be released, and the drive lever is rotated to rotate the latch lever in the disengagement direction. Except when the drive lever and the remote control lock device are put into normal operation by operation, the switchgear cannot open or close by any operation, and the operation is incorrect. After the drive motor operates and the drive lever stops at the lock position of the output shaft, even if you try to rotate the output shaft by operating the control shaft, the fuse on the power supply side of the drive motor already operates at this point. As a result, the drive motor loses its rotational force, and the open / close spring biases the drive lever toward its starting position, so that the output shaft cannot rotate. Therefore, it is impossible to operate the switchgear by mistake,
As long as the operation of the switchgear is an erroneous operation, the current open / closed state can be maintained regardless of this operation, and a disaster due to an erroneous operation can be reliably prevented. Also,
In the present invention, since the projection for locking the output shaft is formed on the latch lever, this projection is formed near the fulcrum of the latch lever, and the control shaft is provided with the blocking plate for blocking the rotation of the latch lever in the unlocking direction. By setting the position of to the far end of the latch lever, the force applied to the control shaft via the output shaft at the time of erroneous operation can be reduced.
Therefore, the remote control lock device can be formed in a small size.

[Brief description of drawings]

FIG. 1 is a perspective view showing the structure of a remote control lock mechanism according to an embodiment of the present invention, FIGS. 2 and 3 are explanatory views showing the principle of unlocking the lock in the structure of FIG. 1, and FIG. FIG. 5 is a perspective view showing an example of the configuration of the remote control lock mechanism of FIG. 5, and FIGS. 5 and 6 are explanatory views showing the principle of unlocking in the configuration of FIG. 1 ... Output shaft, 2 ... Drive shaft, 3 ... Drive lever, 6 ...
... Lock lever, 7,17 ... Control axis, 8,18 ... Far control lock device, 9 ... Pin (fixed point), 14a ... Groove, 15
...... Latch levers, 15a, 15b ...... Protrusions, 16 …… Blocking plates.

Claims (1)

[Scope of utility model registration request] 1. A drive motor having a fuse on the power source side is used as a drive source, and the lever tip portion is driven by a drive lever rotatably driven around the axis by a power supplied from the drive source via a drive shaft. A compression opening / closing spring or a tension opening / closing spring interposed or stretched between the lever and a fixed point provided outside the lever is biased, and the drive lever connects the center of the drive shaft with the fixed point. When it reaches the vicinity, the lock mechanism of the output shaft arranged coaxially with the drive shaft for opening and closing the main contact of the switchgear that has been locked to the open or closed position corresponding to the open or closed position of the main contact of the switchgear is In the distant control lock mechanism having a structure in which the release force of the biased opening / closing spring is transmitted to the output shaft at the time of being released and crossing the dead line, the lock position of the output shaft 1 is set to the drive lever 2 position. Together are set on the front side than the line, the output shaft 1 of the lock is the output shaft 1 or the output shaft 1
An axially formed groove 14a provided in the output lever 14 integrally coupled with the protrusion 14a, which engages with the groove 14a, and an end of the drive lever 3 which is axially aligned with the protrusion 15a. The latch lever 15 formed with a protrusion 15b for preventing the rotation, and the protrusion 15b, the drive lever 3 and the protrusion 15a by the rotation of the latch lever 15.
The control shaft 17 is provided with a blocking plate 16 for blocking the rotation in the direction in which the engagement between the groove 14a and the groove 14a is released, and the control shaft 17 is rotationally driven by a command from a distance to move the blocking plate. The release of the lock of the output shaft 1 is performed by a remote control lock device 18 that rotates to enable the rotation in the disengagement direction with the latch lever 15 against the spring 19 provided on the latch lever 15. The remote control lock of the switchgear is characterized in that the control lock device 18 is controlled so that the lock can be released, and the latch lever 15 is rotated in the disengagement direction by the rotation of the drive lever 3. mechanism.