JPH0568163B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to an interlock device for a manual operating device, such as a disconnector, in which a handle is inserted from the front of a switchboard and an operating shaft is rotated to open and close the operating device.

[Prior art and its problems]

Manual operating devices such as disconnectors generally have an interlock between them and circuit breakers, grounding switches, etc. connected to the same circuit for safety, and the interlock device should be as simple in structure, easy to operate, and highly reliable. It's a good thing.

As shown in FIG. 4, the conventional interlock device for a manual operating device is such that a shutter 3 is mounted to cover an insertion hole on the front surface of the panel of a handle 2 attached to an operating shaft 1 so that it can be moved up and down along the panel surface by a handle 31. . A solenoid 4 for engaging a protruding rod 41 at the upper end of the shutter 3 is provided parallel to the operating shaft 1. When interlocking with other equipment, the solenoid 4 is not energized and the rod 41 protrudes by the spring 42 and locks the shutter 3, so the handle cannot be inserted, and the padlock 5 is placed between the handle 31 and the fixed part of the panel. That's what I do. When the interlock condition is canceled, the solenoid 4 is energized and the rod 41 is retracted, so that the padlock 5 is removed, the shutter 3 is pulled up by the handle 31, and the handle is inserted to enable operation. 6
is a limit switch that detects the insertion of the handle into the operating shaft.

In the conventional interlock device, the solenoid is constantly energized when the interlock condition is canceled, which not only wastes electricity when operating the controller but also causes the coil to overheat, so it is not operated using a key switch or push button. I try to turn off the solenoid circuit at times other than when the solenoid is in use, but it is necessary to follow the operating procedures, which complicates the operation, and also when the
A separate limit switch 6 is required to extract the signal, and the installation and adjustment of the limit switch 6 requires time and effort.

[Purpose of the invention]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an interlock device for a manual operating device that eliminates the above-mentioned drawbacks, has simple operating procedures, does not consume unnecessary electricity, is compact, and has high reliability.

[Key points of the invention]

The present invention includes a shutter for opening and closing the handle insertion hole inside the front surface of the panel, and a solenoid that locks this shutter when de-energized and releases the lock when it is energized. A limit switch operated by a striker with a return spring that rotates about a fixed fulcrum is connected in series to the excitation circuit of the solenoid, and the striker engages with the shutter when it is closed to lock the shutter and push it in. A stopper protrusion is provided that can be disengaged by pushing the handle, and the solenoid is energized only when the solenoid is operated via a limit switch.

[Embodiments of the invention]

FIGS. 1 and 2 show an interlock device for a manual operating device according to an embodiment of the present invention, and parts designated by the same reference numerals as in FIG. 4 are the same parts. A shutter 3 that opens and closes the handle insertion hole of the operating shaft 1 is mounted so as to slide up and down on a shutter guide plate 61 provided on an interlock device mounting frame 6 fixed to the inside of the front surface of the panel.
When the solenoid 4 is not energized, the rod 41 of the solenoid 4 protrudes through the guide plate 61 by means of a spring 42, thereby locking the shutter 3.
The shutter 3 has a push handle 7 equipped with a return spring 71.
are penetrated and engaged. On the other hand, a striker 9 for operating a limit switch 8 mounted on a mounting frame 6 parallel to the solenoid 4 is rotatably mounted on a fixed fulcrum 10 and pulled toward the front by a return spring 11. The striker 9 is provided with a protruding stopper projection 91 that engages with the upper part of the shutter 3 when closed.

When interlocking with other equipment, the excitation circuit of the solenoid 4 is open, so the shutter 3 remains closed and locked.
Insertion of the handle is blocked, but when the interlock release conditions are met and the push-in handle 7 is pressed, the striker 9 is activated.
is rotated to operate the limit switch 8, the solenoid 4 is energized and the rod 41 is retracted against the spring 42, and at the same time, the stopper protrusion 91 of the striker 9 is disengaged from the shutter 3, so the shutter 3 is pulled up while pressing the push-in handle 7, and the handle can be inserted into the operating shaft 1. When the handle is inserted and the push-in handle 7 is released, the push-in handle 7 returns to its original position due to the return spring 71, but the stopper protrusion 91 contacts the shutter 3 and the striker 9 does not return, and the limit switch 8 remains activated and the solenoid is closed. 4 continues to be excited, and a signal indicating "in operation" can be outputted by the limit switch 8. When the handle is removed and the shutter 3 is lowered, the stopper protrusion 91 separates from the shutter, so the return spring 11 causes the striker 9 to fall forward, the contact of the limit switch 8 opens, and the solenoid 4 becomes de-energized, locking the shutter. In this state, the padlock 5 is placed between the push-in handle 7 and the mounting frame 6.

FIG. 3 shows a connection circuit diagram of an interlock device for a manual operating device according to an embodiment of the present invention. The coil of the solenoid 4, the contact of the limit switch 8, and a contact circuit 12 which is made conductive when the interlock is released are connected in series to a power source. By interlocking the contact of the limit switch 8 with the b contact 14 provided in the circuit breaker closing circuit 13, more complete interlock with the circuit breaker can be achieved.

〔Effect of the invention〕

According to the present invention, the interlock device for a manual operating device such as a disconnector is compact and efficient, and the operation procedure is simplified, and the interlock is more complete, resulting in improved reliability.

[Brief explanation of the drawing]

Fig. 1 is a front view of an interlock device of a manual operating device according to an embodiment of the present invention, Fig. 2 is a transparent side view of Fig. 1, and Fig. 3 is a connection of an interlock device of a manual operating device according to an embodiment of the present invention. The circuit diagram, FIG. 4, is a side view of a conventional manual operating device interlock device. 1: Operation axis, 3: Shutter, 4: Solenoid,
5: Padlock, 6: Mounting frame, 7: Push-in handle,
8: Limit switch, 9: Striker, 10:
Fixed fulcrum, 11: Return spring.

Claims (1)

[Claims] 1. In a manual operating device such as a disconnector, which operates by inserting a handle from the front of the switchboard and rotating the operating shaft, there is a shutter that opens and closes the handle insertion hole, and a shutter that is de-energized and locked and energized. A solenoid for releasing the lock is provided inside the front of the panel, and a limit switch is operated by a striker with a return spring that rotates about a fixed fulcrum when pushed by a push handle with a return spring that passes through the shutter. A disconnector or the like, characterized in that the striker is connected in series to an excitation circuit, and the striker is provided with a stopper protrusion that engages with the shutter when closed to lock the shutter, and that can be released from engagement by pushing the push-in handle. Manual operator interlock device.