JPS6343770Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an interlock device for a power switchgear equipped with an electric operating section and a manual operating section.

In a power switchgear equipped with an electric operating section and a manual operating section, there is a risk that both operating sections may be accidentally operated at the same time, and in this case, there is a risk of harm to the manual operator or damage to the operating equipment. Therefore, if either one is operated, the other is usually locked. An example of a device conventionally used in such an interlock mechanism is shown in the first example.
As shown in the figure. In Fig. 1, an interlock cover 1 is fixed to a rotating shaft 2 supported by a frame (not shown), and normally functions as a lock by closing the handle insertion port 3 of the manual operation handle as shown in Fig. 1A. doing. Note that this cover 1 is prevented from rotating counterclockwise from this position by a stopper 1a. The almost fan-shaped cam 4 is attached to the cover 1
It is fixed to the same rotation shaft 2 as the cover 1 and rotates following the cover 1. A push button 5a of an interlock switch 5 of an electric operation section that is opened and closed by rotation of the cam 4 is in contact with one end of the arc of the cam 4. This interlock switch 5 is inserted into the circuit of the electric motor 6 for operating the electric operation section to lock the electric operation section, and is an automatically reset type normally open push button switch, which operates the electric motor 6 (not shown). It is connected in series with the switch to the control power supply.
A push button 7a of an interlock switch 7 of an electromagnet 8, which is opened and closed by rotation of the cam 4, is in contact with the vicinity of the other end of the arc of the cam 4. This interlock switch 7 is an automatically reset type normally open push button switch like the interlock switch 5 of the electric operation section, and is connected in series with the electromagnet operation switch 9 to the excitation circuit of the electromagnet 8 for control (not shown). Connected to power. A protrusion 4a is provided on the opposite side of the circular arc of the cam 4 across the rotation shaft 2,
The protrusion 4a is locked to a latch 10 rotatably supported by a shaft 10a, and the cam 4 is rotated within the range where the cover 1 does not completely open the handle insertion opening 3 of the manual operation handle, in other words, the cover 1 is rotated. Rotation can be prevented. When the interlock switch 7, which is opened and closed by the cam 4, is closed, the electromagnet 8 is energized when the manual operation part is ready and the electromagnet operation switch 9 is closed. Unlock.

In the state shown in FIG. 1A, the cam 4 presses the push button 5a to close the interlock switch 5 of the electric operation section, and the electric motor 6 can operate the electric operation section using the operation switch. At this time, the handle insertion port 3 is closed by the cover 1 and cannot be manually operated. Furthermore, since the interlock switch 7 is open, even if the operating switch 9 is closed, the electromagnet 8 cannot be excited to attract the latch 10. Now, when the cover 2 is rotated in the direction of the arrow P, the push button 5a will open as shown in FIG.
is released, the interlock switch 5 automatically opens, and the circuit of the electric motor 6 is opened, so that the electric operation section is locked. Also, the push button 7a is pushed by the cam 4 to close the interlock switch 7. However, at this time, if the manual operating section is not ready, for example, if the operating switch 9 is not turned on, the electromagnet 8 will not be energized, so the cam 4 will be latched to the latch 10 and stopped at this position. At this time as well, the handle insertion port 3 does not open completely and the handle cannot be inserted. Therefore, manual operation is not possible. Of course, it cannot be operated electrically. Next, when the manual operation part is ready and the operation switch 9 is closed, the electromagnet 8 is energized and the latch 10 is attracted to the electromagnet 8, so the cam 4 can freely rotate, and the interlock cover 1 is further moved in the direction of the arrow P. The handle insertion port 3 is completely opened, and the handle can be inserted to perform manual operation.

The interlock cover 1 can always be rotated in the direction opposite to the P arrow by pulling out the handle 3. At this time, if the vehicle is stopped in the state shown in FIG. 1B, both the manual operation section and the electric operation section can be locked at the same time. If the interlock cover 1 is further rotated in the direction opposite to the P arrow until it is stopped by the stopper 1a, the state returns to FIG. 1A, and it is possible to unlock the electric operation part while keeping the manual operation part locked. can. As described above, the interlock device shown in FIG. 1 is safe because it always locks the other operating section both during electric operation and manual operation, and can also lock both at the same time.

However, in this interlock device, the shape of the cam requires high precision, and the interlock cover 1 starts rotating, and the electromagnetic interlock switch 7 closes during the rotation of the cam 4. Therefore, even when the preparation for manual operation is not completed, that is, even when the electromagnetic operation switch 9 is not turned on, the operator may accidentally lock the manual operation part at the stage of turning the interlock cover 1. There is a drawback that the latch 10 is judged to have been released and the rotation of the interlock cover 1 is prevented by the latch 10, which tends to give the illusion that the interlock device is malfunctioning.

The present invention aims to eliminate the above-mentioned drawbacks and to provide a simple and reliable interlock device.

The purpose of this is to provide an interlock cover that rotates to enable or disable insertion of the manual operation handle into the handle insertion port, a cam that is fixed to and rotates on the rotation shaft of the interlock cover, and a cam that rotates and is fixed to the rotation shaft of the interlock cover. and a latch that prevents rotation of the rotating shaft when the interlock switch of the electric operation unit is closed at a cam position where the handle cannot be inserted, and a latch that operates the interlock cover to enable the handle to be inserted. an interlock device configured to open an interlock switch of the electric operating section and close an interlock switch that enables excitation of an electromagnet for attracting the latch, which releases the prevention of rotation of the cam by the latch; The cam is configured such that the cam surface that closes the interlock switch of the electric operation section and the cam surface that engages the latch can move by a predetermined distance in the axial direction of the rotating shaft while maintaining engagement. When the rotating shaft is moved in one direction, an interlock switch of an electromagnet that releases the blocking of the rotation of the cam is opened, and when the rotating shaft is moved in the other direction, it is closed. This is achieved by providing a locking mechanism that locks the interlock cover in a position where the interlock cover is in the possible position and the rotating shaft is moved in the direction in which the interlock switch of the electromagnet is opened. Note that the rotating shaft is moved by a spring that biases it in its axial direction, and the interlock cover is preferably locked at the position where the rotating shaft is moved against this spring bias. The interlock cover may have a protrusion inserted into a hole provided near the handle insertion opening, and the interlock cover may be locked at a position where the rotation shaft is moved in the axial direction and the protrusion is inserted into the hole. good.

Next, embodiments of the present invention will be described in detail based on the drawings. In Fig. 2, interlock cover 1
is fixed to a rotating shaft 2 supported by a frame 13, and normally serves to lock the manual operation section by closing the handle insertion port 3 of the manual operation handle, as shown in FIG. Note that this cover 1 is provided with a stopper 1a to prevent it from rotating counterclockwise from this position.
is prevented by. A substantially fan-shaped cam 4 is fixed to the same rotating shaft 2 and rotates following the interlock cover 1. A push button 5a of an interlock switch 5 of an electric operation section that is opened and closed by rotation of the cam 4 is in contact with one end of the arc of the cam 4. This interlock switch 5 is inserted into the circuit of the operating motor 6 of the electric operating section to lock the electric operating section, and is an automatically reset normally open type push button switch, together with an operating switch (not shown) of the electric motor 6. Connected in series to the control power supply. The above configuration is almost the same as the conventional one shown in FIG. 1, but the interlock device according to the present invention allows the rotating shaft 2, which fixes the interlock cover 1 and the cam 4, to be freely movable in the axial direction. The shaft 2 is provided with a spring 11 that biases the shaft 2 to the right as shown in FIG. The interlock cover 1 is pushed backward by a gap d and tightened with a thumbscrew 12 through a hole provided in the interlock cover 1. Also, on the rear end surface of the shaft 2,
Interlock switch 7 of normally closed electromagnet 8
In the state shown in the figure in which the shaft 2 is pushed in by making contact with the push button 7a, the circuit is opened. This interlock switch 7 is connected in series with the operating switch 9 of the electromagnet 8 to the excitation circuit of the electromagnet 8, as in the conventional case, and is connected to a control power source (not shown).
There is a protrusion 4a on the opposite side of the arc of the cam 4 across the shaft 2.
This protrusion 4a is locked by a latch 10 rotatably supported by a shaft 10a, and prevents rotation of the cam 4 within the range where the interlock cover 1 does not completely open the handle insertion port 3. can. When the interlock switch 7, which is opened and closed by the movement of the shaft 2, is closed, the electromagnet 8 is energized when the manual operation preparation is completed and the operation switch 9 is closed, attracting the latch 10 and causing the cam 4 to engage. Release the stop. In addition, in the present invention, the cam 4 is made thicker than the conventional one, so that even if the cam 4 moves back and forth, the latch 10 and the push button 5a of the interlock switch 5 will not touch the cam 4.
Care has been taken to ensure that it does not come off.

FIG. 2 shows a state in which the cam 4 presses the push button 5a to close the interlock switch 5, and the electric motor 6 can operate the electric operation section by the operation switch. At this time, the handle insertion port 3 is closed by the interlock cover 1, so the handle cannot be inserted and manually operated.
Furthermore, since the interlock switch 7 is open, even if the operating switch 9 is closed, the electromagnet 8 cannot be excited to attract the latch 10. At this point, when the thumbscrew 12 is removed, the interlock cover 1 will be removed from the spring 11.
As shown in FIG. 3A, the interlock switch 7 is pushed out by the gap d, and the interlock switch 7 is closed. Therefore, if the preparation for manual operation is completed and the operation switch 9 is closed, the electromagnet 8 will be energized and the latch 10 will be attracted to the electromagnet 8, so the cam 4 will be unlocked and the interlock cover 1 will be closed as shown in FIG. As shown in B, the handle insertion opening 3 is opened by rotating in the direction of the arrow P, and the handle can be inserted therein for manual operation. At this time, since the interlock switch 5 is opened, the electric operation section is locked. If the manual operation preparation is not completed and the operation switch 9 is open,
Since the electromagnet 8 is not energized, the latch 10 is connected to the cam 4.
Since it is locked and the interlock cover 1 cannot be rotated, manual operation cannot be performed.
Next, rotate the interlock cover 1 in the opposite direction of the P arrow until it touches the stopper 1a, and when the handle insertion port 3 is completely closed, the state returns to the state shown in Fig. 2 and the interlock switch 5 is closed, so that the electric operation section can be closed. The lock will be broken. At this time, if the interlock cover 1 is pressed to open the electromagnetic interlock switch 7 and tighten it with the thumbscrew 12, the manual operation section is completely locked. As described above, the cam of the interlock device according to the present invention has the main task of opening and closing the interlock switch of the electric operation section, and does not require much precision. In addition, the electromagnetic interlock switch rotates the interlock cover like the conventional one,
Since there is no operation step operated by a cam, and it closes with the first action of removing the thumbscrew, the main operation is for the operator to turn on the operation switch that enables the excitation of the electromagnet, which is the preparation step for the manual operation section. Therefore, even if the cam is locked by the latch, the operator can confirm that the operating switch is not turned on, and there is no illusion that the interlock clock device is abnormal.

FIG. 4 shows the interlock device shown in FIG. 2, except that the spring 11 that protrudes the shaft 2 of the interlock cover 1 is removed, and the interlock cover 1 is provided with a protrusion 1b that is inserted into a hole in the frame 13. The rest of the configuration is exactly the same as that in FIG. 2, so it will be omitted. In this device, when the interlock cover 1 is pushed by hand and the protrusion 1b is inserted into the hole in the frame 13, the electric operation part is unlocked and the handle insertion opening 3 is closed by the interlock cover 1. At this time, the interlock cover 1 cannot be rotated. If the interlock cover 1 is pulled forward (to the right in Figure A) by hand and the protrusion 1b is pulled out from the hole in the frame 13, the interlock cover 1 becomes rotatable and is exactly the same as the device shown in Figure 2. The manual operation section can be unlocked. To lock the manual operation section and unlock the electric operation section, do the opposite.

As described above, the interlock device according to the present invention has a configuration in which the interlock cover of the manual operation section and the cam are fixed to the same rotation shaft, and this shaft is moved in the axial direction, and the cam is configured to move the interlock cover of the manual operation section in the axial direction. Since the main task is to open and close the interlock switch that locks or unlocks the lock, it does not require much precision.
In addition, since the interlock switch of the electromagnet is opened and closed at the same time as the shaft moves in the axial direction, there is no step of rotating the interlock cover and closing the interlock switch of the electromagnet, as in the conventional case. This is an excellent device that gives the operator a sense of security because it is determined that the manual operation part is unlocked only when the cam is unlocked.

[Brief explanation of drawings]

Fig. 1 shows a conventional interlock device implemented in a power switchgear; A is a schematic diagram showing a state in which the manual operation part is locked; B is a schematic diagram showing a state in which both operation parts are locked; The figure shows an embodiment of the interlock device according to the present invention with the manual operation part locked, A is a side view of the mechanism and the electromagnet circuit, B
3 shows a front view of the mechanism and part of the electric operation section, FIG. 3 shows the manual operation section in FIG. 2 unlocked, A is a side view of the mechanism and the electromagnet circuit, and B is a front view of the mechanism. FIG. 4 shows another embodiment of the interlock device according to the present invention, and A shows a side view of the mechanism and an electromagnet circuit, and B shows a front view of the mechanism and a part of the electric operation part. 1... Interlock cover, 1b... Cover protrusion, 2... Rotating shaft, 3... Operating handle insertion slot, 4... Cam, 5... Interlock switch of electric operation section, 7... Electromagnet Interlock switch, 8...electromagnet, 10...latch, 11...shaft biasing spring, 13...device frame.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An interlock cover that rotates to enable or disable the insertion of a manual operation handle into the handle insertion slot, and an interlock cover that is fixed to the rotating shaft of the interlock cover. It is equipped with a rotating cam and a latch that prevents the rotating shaft from rotating when the cam closes the interlock switch of the electric operation unit at a cam position where the handle cannot be inserted, and the interlock cover is operated. An interlock switch of the electric operation part opens when the handle is rotated to enable insertion of the handle, and an interlock switch that enables excitation of an electromagnet for attracting the latch, which releases the latch from blocking rotation of the cam. In the interlock device configured to close the interlock switch, the cam is configured to close the interlock switch of the electric operating section while the cam surface that engages the latch maintains engagement with the cam surface that closes the interlock switch of the electric operation section. The cam is configured to be movable by a predetermined distance in the direction, and the rotation axis is configured to open an electromagnetic interlock switch for releasing the blockage of the rotation of the cam when the rotation axis is moved in one direction, and close the circuit when the rotation axis is moved in the other direction. When the interlock cover is in a position where the handle cannot be inserted, the rotating shaft is moved by a spring that biases it in the axial direction, and the rotating shaft is moved against the bias of the spring by the interlock switch of the electromagnet. 1. An interlock device comprising a locking mechanism that locks the interlock cover at a position where the interlock cover is moved in a direction in which the interlock cover is opened. (2) In the interlock device according to claim 1 of the utility model registration claim, the interlock cover has a protrusion that is inserted into a hole provided near the handle insertion opening, and the interlock cover has a protrusion that is inserted into a hole provided in the vicinity of the handle insertion opening, and that moves the rotation axis in the axial direction. An interlock device characterized in that the interlock cover is locked at a position where the protrusion is inserted into the hole.