JPH02162621A - Lock device for switch - Google Patents

Abstract

PURPOSE:To ensure mechanical and electrical lock and obtain high reliability and compact design by placing a lock pin at a position for preventing the turn of a lever and closing a control circuit with a limit switch inserting therein and interlocked with the lock pin. CONSTITUTION:For locking a switch, a lock pin 23 is made to slide along a guide 25, the engagement groove 23a of the lock pin 23 is engaged with an engagement tongue 26a and a lock 27 is turned on, thereby enabling locking a lock device. As a result, the rotation of a driving shaft 1 is constrained with the armature 2a of an electromagnetic coil 2 in a mode retaining mechanism, and the switch is turned to a mechanically locked mode. In the aforesaid mode, a limit switch 24 interlocked with the lock pin 23 is turned from a close circuit mode to an open circuit mode, and the control circuit of the switch is turned to an open mode, thereby keeping the switch electrically locked.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention transmits the rotational force of an electric motor or the rotational force of a manual operation shaft due to an input to the operating section side by a rotational force transmission means, The present invention relates to a switch locking device that converts this rotational force into a predetermined form of operating force to open and close a movable part of the switch.

(Prior Art) Switches such as disconnectors and earthing switches are configured to be operated by electrical operation at the site or at a switchboard, or by manual operation at the site. With such switches, during inspection work, etc., it is necessary to lock the switch so that it cannot be operated electrically from either the site or the switchboard, and at the same time cannot be operated using the manual operation handle at the site. Ru. This is to prevent erroneous operation of switches such as disconnectors and grounding switches, taking into consideration the safety of workers and the protection of the power system during inspection work.

FIG. 4 is a perspective view showing an example of the structure of such a locking device for a switch. In Fig. 4, drive shaft 1
When the switch is in the open or closed position, the armature 2a of the electromagnetic coil 2 of the state holding mechanism is connected to the hole 1a of the drive shaft 1.
By engaging with the switch body, the switch main body is held so as not to move due to its own weight or disturbance force.

When the switch receives a command to open or close the circuit, the electromagnetic coil is first excited, the armature 2a is disengaged from the hole 1a of the drive shaft 1, and the drive shaft 1 becomes free to rotate. After that, the electric motor 3 rotates, and its rotational force is transmitted to the small diameter gear 4 on the electric side.
, is transmitted to the drive shaft 1 via the large diameter gear 5. Drive shaft 1
The rotational movement of the pinion 6 fixed at the other end is converted into linear movement by the rack 7 meshed with it, and the linear movement of the movable part 8 of the switch fixed to this rack 7 causes the switch to move. Opening and closing operations are performed.

On the other hand, during manual operation, when the shutter 9 is rotated counterclockwise in the figure, the limit switch 20 is closed in conjunction with the shutter 9, so that the electromagnetic coil 2 of the state holding mechanism is energized, and the armature 2a and drive Hole 1a of shaft 1
is disengaged, and the drive shaft 1 becomes free to rotate. Thereafter, by inserting the manual operation handle 10 into the manual operation shaft 11 and rotating it, this rotational movement is transferred to the manual side small diameter gear 12,
As in the case of electric operation via the large diameter gear 5, the rack 7
The movable part 8 is then converted into linear motion, and the switch is opened and closed.

In such a switch, at the center of the drive shaft 1, there is a first
The first lever 13 is fixed, and as the drive shaft 1 rotates, the first lever 13 also rotates. A locked pin 14 is fixed to the tip of this lever 13, and is adapted to engage with a second lever 15 through a lock hole 15a at one end of the lock pin 14 when the switch has completed its operation. The second lever 15 has a shaft 1G, which is a separate member, inserted into a shaft hole 15b provided at the other end of the lock hole 15a, and is rotatable and slidable in the axial direction with respect to the shaft IG.

If you want to lock the switch during inspection work, etc., while sliding the second lever 15 in the direction of its shaft 16, insert the cover of the tip of the first lever 13 into the lock hole 15a of the second lever 15. By inserting the lock bin 14 and locking the tip of the insertion portion of the locked bin 14 with the lock 1A, the switch can be locked at the operation completion position. In the normal state, the second lever 15 is released from the locking pin 14 and rotates about the shaft 16 to engage the locking pin 18 and lock the lock 1.
7 to lock the switch, thereby making the switch ready for operation.

(Problem to be Solved by the Invention) By the way, in the conventional lock device as described above, if a predetermined stroke is obtained when the drive shaft 1 rotates an integral number of times, the second lever 15, the shaft 1B, and the lock 17 Although the locking pin 18 can be configured with only one set, in other cases, two sets are required for the open and closed circuit completion positions, which tends to complicate the configuration.

Furthermore, since the first lever 13 is usually placed in the middle between the switch main body and the operating device, a space for placing the first lever 13 is inevitably required between the switch main body and the operating device. , there is a problem that the structure becomes large.

Further, in the locking device, when a circuit opening or closing command is given to the electric motor 1 in the locked state, the first lever 13, the locked pin 14, the second lever 15, the shaft 1B, and the electric side gear 4, The large-diameter gear 5, drive shaft 1, etc. must have enough strength to withstand the rotational force of the electric motor 3, which poses problems in terms of cost and reliability. Further, in this case, even if the strength of each member is sufficient, the electric motor 3 or a motor protection device such as a fuse may be burnt out.

As a preventive measure against such inconvenience, a limit switch 19 linked to the second lever 15 is installed in the control circuit of the switch.
It is necessary to insert a contact and configure the circuit so that the control circuit opens in the locked state. In this case, it is also necessary to provide a waterproof box, wiring duct, etc. around the limit switch 19 in order to prevent poor conductivity due to rusting of the contact points of the limit switch 19, which complicates the configuration. Put it away.

An object of the present invention is to provide a locking device for a switch that can mechanically and electrically lock the switch reliably, is highly reliable, is compact, simple, and has excellent economic efficiency.

[Structure of the invention]

(Means for Solving the Problems) A locking device for a switch according to the present invention is provided with a lever that rotates in conjunction with an armature of an electromagnetic coil of a state holding mechanism, and the armature of the electromagnetic coil of this state holding mechanism is connected to an operating device. A lock pin is placed in a position that prevents rotation of the lever so that the armature is locked when it is engaged with the hole in the drive shaft of the lever, and a limit switch is inserted into the control circuit of the operating device. The present invention is characterized in that the limit switch is opened in conjunction with the lock pin.

(Function) In the present invention, the switch can be mechanically locked by blocking the rotation of the lever interlocked with the armature of the electromagnetic coil of the state holding mechanism using the lock pin. Further, by opening the limit switch in conjunction with the cap pin, the control circuit can be opened, so the switch can be electrically locked. Therefore, in the present invention, the problems of requiring high strength of the structural members and problems of applying an unreasonable load to the electric motor are solved, and economy and reliability are improved. Furthermore, since the configuration utilizes a state holding mechanism that is conventionally built into the operating device, there is also the advantage that the device can be significantly downsized and simplified.

(Example) Hereinafter, an example of the locking device for a switch according to the present invention will be described.
This will be explained in detail with reference to FIG.

Note that the same parts as those in the prior art shown in FIG. 4 are given the same reference numerals, and their explanation will be omitted. In FIG. 1, the drive shaft 1 is configured such that the armature 2a of the electromagnetic coil 2 of the state holding mechanism engages with the hole 1a of the drive shaft 1 when the switch is in the open or closed position, so that the switch main body is It is held so that it does not move due to its own weight or disturbance force.

When the switch receives a command to open or close the circuit, the electromagnetic coil 2 is first excited, the armature 2a is disengaged from the hole 1a of the drive shaft 1, and the drive shaft 1 becomes free to rotate. After that, the electric motor 3 rotates, and its rotational force is transmitted to the small diameter gear 4 on the electric side.
, is transmitted to the drive shaft 1 via the large diameter gear 5. Drive shaft 1
The rotational motion of the pinion 6 fixed at the other end is converted into linear motion by the rack 7 meshed with it, and the linear motion of the movable part 8 of the switch fixed to this rack 7 causes the switch to move. Opening and closing operations are performed.

On the other hand, during manual operation, when the shutter 9 is rotated counterclockwise in the figure, the limit switch 20 is closed in conjunction with the shutter 9, so that the electromagnetic coil 2 of the state holding mechanism is energized, and the armature 2a and drive Hole 1a of shaft 1
is disengaged, and the drive shaft 1 becomes free to rotate. after that,
By inserting the manual operation handle 10 into the manual operation shaft 11 and rotating it, this rotational movement is transferred to the manual side small diameter gear 12.
Similarly to the case of electric operation, the rack 7 and movable part 8 are converted into linear motion via the large-diameter gear 5, and the opening/closing operation of the switch is performed. That is, the operation driving force transmission structure in this embodiment is completely the same as that of the prior art shown in FIG.

In addition to such a configuration, in this embodiment, as a mechanical locking means, an armature 2b that moves integrally with the armature 2a is protruded from the side opposite to the armature 2a of the electromagnetic coil 2 of the state holding mechanism, and the armature 2b is moved in unison with the armature 2a. A lever 22 that rotates about a shaft 21 in conjunction with the lever 22 is provided at the tip. Furthermore, a lock pin is placed in a position to prevent rotation of the lever 22 so that the armature 2a and 2b of the electromagnetic coil 2 of this state holding mechanism is engaged with the hole 1a of the drive shaft 1, and the armatures 2a and 2b are locked. 23 are arranged. Further, as an electric locking means, a limit switch 24 is provided behind the lock pin 23 and opens the control circuit of the switch in conjunction with the lock pin 23.
is provided.

With this configuration, in order to lock the switch during inspection work, etc., the lock pin 23 is slid along the guide 25, and the engagement groove 23a of the lock pin 23 is inserted into the locking branch 28a. The lock device can be locked by engaging the lock 27 and locking the lock 27. As a result,
The rotation of the drive shaft 1 is restrained by the armature 2a of the electromagnetic coil 2 of the state holding mechanism, and the switch becomes mechanically locked.

Furthermore, in this state, the limit switch 24 interlocked with the lock pin 23 is switched from the closed state to the open state, and the switch control circuit is opened, so that the switch is electrically locked. state.

In addition, in the normal state, the lock bin 23 is attached to the locking branch 2.
6a, slide it along the guide 25, engage the locking mechanism 28b, and lock it with the lock 27, the limit switch 24 is closed, the control circuit of the switch is closed, and the switch is opened/closed. The device is ready for operation. Furthermore, in the above invention, the lever 22 is provided to place the lock pin 23 in a location with good operability, and the same effect can be obtained even if the lock pin 23 is placed in a position that directly blocks movement of the armature 2b. It is clear that the following can be obtained.

FIG. 2 shows an example of the configuration of the control circuit of the switch. Second
In Figure (A), P and N are control power busbars installed in the control panel of the switch (not shown).

Further, C81 is a local closing control switch (hereinafter referred to as a closing switch), and its closing causes the circuit to be linked to a closing end detection limit switch (hereinafter referred to as a closing limit switch) LSI and a shutter 9 not shown in FIG. Contact LS3 of the limit switch 20 (hereinafter referred to as shutter interlock switch) and contact R of switch lock control relay (hereinafter referred to as lock relay) Ryo
31, a closing control relay (hereinafter referred to as a closing relay) RYl is energized.

Furthermore, C52 is a local opening control switch (hereinafter referred to as an open switch) provided in pair with the above-mentioned close switch C3I, and the circuit controls the open circuit end detection limit switch LB2 (hereinafter referred to as an open limit switch) and the shutter. An opening control relay (hereinafter referred to as an opening relay) Ry 2 is energized via the series switch LS and the contact R3□ of the lock relay Ry3. Further, the normally open contacts Rii' R21 of the close relay Ry and the open relay Ry 2 are provided in parallel with the close switch C3I and the open switch CS2 to form a self-holding circuit.

LB4 is a normally closed contact of a limit switch 24 that is linked to the lock bin 23 shown in FIG. 1, and LB5 is a limit switch 2 that is linked to the shutter 9 shown in FIG.
0 normally open contact, R12 and R22 are each closed relay RY
, the normally open ■ contact of open relay Ry2, and these keep the state holding mechanism (electromagnetic coil) LB
It constitutes a circuit. That is, when the electromagnetic coil 2 of the state holding mechanism is locked by the lock bin 23, the contact LS4 is in an open state, and the electromagnetic coil 2 of the state holding mechanism is locked.
Since the lock pin 23 is not excited, the lock bin 23 is not subjected to the electromagnetic force of the electromagnetic coil 2 of the state holding mechanism, so the lock device itself does not require high strength at all.

Also, at this time, the excitation of the lock coil Ry3 is released, so the lock coil RY inserted in the control circuit
Since the contact R31 becomes open, the control circuit becomes open, and the switch is electrically locked.

In addition, during manual operation, when the shutter 9 shown in FIG. 1 is rotated counterclockwise in the figure, the contact L of the limit switch 20
Since S5 switches to a closed circuit, the electromagnetic coil 2 of the state holding mechanism
is excited, the connection between the armature 2a and the hole 1a of the drive shaft 1 is released, and the drive 11tll becomes free to rotate and manual operation becomes possible.

On the other hand, in FIG. 2(B), PM and NM are control power busbars similarly arranged in the control panel of the switch. In addition, R13' R14 is the normally open contact of the closed relay RV1,
RR is a normally open contact 23' 24 of the open relay Ry 2, and LB6 is a normally open contact of a limit switch that is linked to the electromagnetic coil 2 of the state holding mechanism (not shown in FIG. According to the directive,
First, the connection "13' R14 or R2g" 24 is closed, and then the electromagnetic coil LB of the state holding mechanism is excited, and the limit switch LS6 interlocked with this is switched from the open state to the closed state to drive the electric motor 3. That's what I do.

Normally, switches such as disconnectors and grounding switches have an electrical interlock circuit between them to prevent incorrect operation, and if the interlock is applied, the switch will not close. Even if a command or an opening command is given, the closing relay Ry1 or the opening relay Ry2 is not energized. Further, at this time, the electromagnetic coil LB of the state holding mechanism shown in FIG. 2(A) is not excited, and the switch is in a locked state both electrically and mechanically.

In addition, even if the electromagnetic coil 2 of the state holding mechanism is locked by the lock pin 23 due to a failure of the limit switch 24, the electromagnetic coil 2 of the state holding mechanism is energized by a close command or an open command of the switch. Since the electromagnetic coil 2 of the state holding mechanism is mechanically locked, the armatures 2a and 2b do not operate, and the limit switch LSB linked to the armature 2a or 2b remains open, so the motor 3 does not rotate. , malfunction of the switch can be prevented, and no excessive force is applied to each component.

As explained above, according to this embodiment, the switch operating device has a simple structure in which the armature 2b or 2a of the electromagnetic coil 2, which is a state holding mechanism built in conventionally, is locked with the lock pin 23. , it is possible to lock the switch mechanically and electrically.

That is, in this embodiment, there is no need for a space to provide a lock device between the switch main body and the operating device as in the conventional case, and there is a possibility that external forces such as the rotational force of the electric motor and input may be applied to the lock device. There is no need for strength of each component of the locking device. Therefore, according to this embodiment, it is possible to provide a locking device for a switch that is highly reliable, compact, simple, and economical.

Note that although the above embodiment has been described using an electromagnetic coil as the state holding mechanism, the present invention may be applied not only to a system in which the state of the drive shaft is released electrically but also to a system in which the state is released mechanically. is possible.

One embodiment is shown in FIG. In FIG. 3, at the circuit closing completion position, the circuit closing side state holding mechanism 28 is connected to the engaging portion 1 of the drive shaft 1.
b to hold the switch, and conversely, at the circuit-opening completion position, the open-circuit side state holding mechanism 29 engages with the engaging portion 1c of the drive shaft 1 to hold the switch.

Closed side and open side state holding mechanism 28, 29 and drive shaft 1
As a method of mechanically releasing the engagement with the engaging portions 1b and lc, a slight air movement angle is provided between the large-diameter gear 5 and the drive shaft 1 using a cam, etc., and the large-diameter gear 5 is fixed to the side surface of the large-diameter gear 5. The released release pin 5a holds the closed circuit side or open circuit side state holding mechanism at the fulcrum 28.
a or 29a as the rotation center to release the engagement with the engaging portion 1b or IC of the drive shaft 1, and then the cam etc. between the large diameter gear 5 and the drive shaft 1 engage, and the drive shaft 1 is rotated. Possible methods include rotating.

In such a configuration, by inserting the lock pin 23 between the closed circuit side and open circuit side state retention mechanisms, the state retention mechanism can be locked and the switch can be mechanically locked. In this case, when the limit switch 24 becomes open, the control circuit of the switch also becomes open, making it possible to electrically lock the switch.

Although the above embodiment describes an electric switch that uses gears as a rotational force transmission means, the present invention is not limited to this. Applicable to electric switches that use various rotational force transmission means, including so-called electric storage spring type switches that store energy and use the release force of the drive spring to operate the switch. Is possible.

〔Effect of the invention〕

As explained above, in the present invention, the rotational force from the electric motor or the rotational force from the input is transmitted to the operating section side by the four rotational force transmission means, and this rotational force is converted into a predetermined form of operating force to move the switch. In a switch that is designed to open and close a section, the switch can be mechanically locked by locking with a lock pin of the state retention mechanism of the switch operating device, and at the same time, a limit that is linked to the lock pin can be locked. It is possible to provide a highly reliable, compact, simple, and economical switch locking device that can electrically lock the switch by opening the switch.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a switch lock device according to the present invention, FIGS. 2A and B are circuit diagrams showing a control circuit of the same embodiment, and FIG. 3 is a switch lock according to the present invention. Another embodiment of the device, FIG. 4 is a perspective view showing a conventional locking device for a switch. 1... Drive shaft 2... Electromagnetic coil of state holding mechanism 3... Electric motor 8... Movable part of switch 9.
...Shutter 10...Manual operation handle 11
...Manual operation axis 23...Lockbin agent
Patent Attorney Nori Ken Yudo Chika Ken Daishimaru (A) Figure

Claims (1)

[Claims] an operating device that transmits the rotational force of the electric motor or the input rotational force to the operating section side through a rotational force transmission means, and converts this rotational force into a predetermined form of operating force to open and close the movable section of the switch; A locking device for a switch including a control circuit for an operating device, wherein the operating section is locked by a state holding mechanism that holds the operating section in a closed circuit and circuit completion position of the switch.