JP2006034023A - Locking device for drawer type power distribution apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a locking device that can release a locking mechanism by manual operation in addition to a locking function by a normal command (an electric signal) from a board side, with regard to the locking mechanism that locks a drawer type power distribution apparatus mounted on a cradle and stored in a distribution board to a 'disconnection position' and a 'connection position'. <P>SOLUTION: A manual push-button operation rod 19, which is attached to a lever locking mechanism and directs its operation end forward to face a locking pawl piece 15, is provided for the locking device comprising a locking rod mounted on a track of the power distribution apparatus in combination with a manually-operated drawer lever 7; a locking plate arranged at the bottom side of the cradle and that locks the locking rod to the positions corresponding to the 'connection position' and the 'disconnection position;' and an automatic locking system lever locking mechanism 10 that has a locking cam 14, a locking pawl piece 15, and an electromagnet 16 that uses the locking pawl piece as an armature, that normally locks the lever to the locking position with the locking cam 14 connected to the drawer lever 7, and releases the locking by the electromagnet by receiving an external command. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a locking device that latches a drawer-type power distribution device intended for a grounding device or the like mounted on a power distribution panel at a “connection position” or “disconnection position” in the panel.

The grounding device mentioned above is installed in the panel together with the circuit breaker, disconnector and other power distribution equipment connected to the main circuit bus of the switchboard. When checking the main circuit in the switchboard, the circuit breaker, disconnector The main circuit in the panel is disconnected from the external power system by turning off etc., and the main circuit bus that has been charged so far is grounded to prevent the operator's electric shock accident. Distribution equipment uses a vacuum circuit breaker with current switching capability such as charging current as a grounding device.
This grounding device is mounted on a cradle built in the switchboard as a drawer-type device with a carriage. During normal times, the grounding device is pulled out to the `` disconnection position '' and held at a position separated from the main circuit disconnection part placed behind it. In addition, the grounding device is moved from the “disconnection position” to the “connection position” and connected to the main circuit disconnection part during inspection in the panel, and then the vacuum circuit breaker is closed to ground the main circuit bus. I have to.

By the way, the position of the grounding device in the panel may cause a serious accident if it is arbitrarily moved from the “disconnection position” or “connection position” due to misoperation or mischief of outsiders. As a safety measure for this purpose, as a safety measure, a grounding device has conventionally been installed on the cradle at the specified “disconnection position” and “connection position” so that it cannot be moved and grounded. When moving the device between the “disconnection position” and the “connection position”, take an electrical interlock with the power distribution side, give a release command to the lock means after confirming all safety, The grounding device is moved manually after releasing the lock of the locking means by this command.
On the other hand, as a configuration example of the lock means for hooking the drawer-type power distribution device housed in the switchboard at a fixed position, a vertically movable lock rod (rod) that is manually engaged and disengaged to the device side, and the lock is always Equipped with an auto-lock type locking device that combines an electromagnet that unlocks the lock bar in accordance with an external release command (electrical signal). A configuration has been conventionally implemented in which a locking hole drilled in a traveling rail of a carriage is fixed at a fixed position inside, and is latched at this position. Further, with respect to this locking device, the lock rod and the electromagnet Set up the vertical play between the locking claw connected to the rail, and on the rail front end side of the panel side, a step exceeding the play range and a taper surface of the front lowering are formed to carry in the distribution equipment. When unloading, the electromagnet is connected to the control power supply. Also have a state, by using the tapered surface forwardly downwardly of the locking rod play and the rail, carrying the power distribution equipment, there is known configuration so as to perform discharge (for example, see Patent Document 1).
JP-A-3-235604

By the way, in order to apply the locking device disclosed in Patent Document 1 to a power distribution device housed in a power distribution panel, it is necessary to change the rail laid on the bottom of the power distribution panel to a special structure. There is a problem of versatility that there are restrictions on the combination of the locking means installed in the switchboard and the structure of the switchboard, and it cannot be easily applied to the existing switchboard.
The present invention has been made in view of the above points, and the object of the present invention is to solve the above-mentioned problems, and without requiring a structural change on the switchboard side, the distribution device accommodated in the panel can be referred to as “disconnect position”, “connection position”. In addition to a lock mechanism with a drawer lever that latches on the door, it is usually manually operated when loading and unloading power distribution equipment in addition to a lock function that unlocks the drawer lever only by a command (electrical signal) from the panel. It is an object of the present invention to provide a drawer type power distribution device locking apparatus which is improved so that the drawer lever can be unlocked.

In order to achieve the above object, according to the present invention, a "connection position" or a "disconnection position" with a main circuit disconnection portion placed behind a drawer-type distribution device with a carriage mounted in a cradle and housed in a switchboard. The lock device for the drawer-type power distribution device that allows the power distribution device to move between the “connection position” and “disconnection position” by releasing the lock by an external command and It shall be configured as follows.
That is, a lock rod mounted on the cart of the power distribution device in combination with a manually operated drawer lever, and a lock rod placed on the bottom side of the cradle to lock the lock rod at a position corresponding to the “connection position” and “disconnection position” A lock plate that is connected to the drawer lever and is locked to the lock position at all times, and an automatic lock lever chain that releases the lock by an electromagnet attracting operation in response to an external command. It is composed of a lock mechanism, and a manual lock release means attached to the lever lock mechanism so that the lock of the drawer lever can be released manually (claim 1). The configuration is as follows.
(1) The lever locking mechanism includes a lock cam linked to a drawer lever, a locking claw piece serving as an armature of an electromagnet that locks the lock cam at a lock position, and the locking claw piece connected to a cam lock. A return spring that urges toward the locking position, an electromagnet that drives the locking claw piece to the unlocking position by a suction operation that is excited by receiving an external command, and a manual unlocking means, The operation end is directed to the front surface side of the power distribution device, and is constituted by an assembly with a push button type release operation rod disposed opposite to the locking claw piece (Claim 2).
(2) In the preceding paragraph (1), as a measure to prevent erroneous operation of the release operation rod and mischief of outsiders, a blind cover is provided on the front surface of the power distribution device so as to cover the operation end of the rod. To prevent access to the unlocking operation rod (claim 3).

  According to the above configuration, an automatic lock mechanism that locks the drawer lever of the lock mechanism to the lock position with respect to the manually operated lock mechanism that latches the distribution device housed in the switchboard at the “connection position” and “disconnection position”. When the distribution device is carried in or out of the distribution board while securing the lock function (in this state, the electromagnet of the lever locking mechanism equipped on the distribution device is not connected to the control power supply, and the drawer lever is In the case of being locked, the drawer lever can be manually operated freely by manually pressing the unlocking operation rod from the front of the device to release the lock of the lever lock mechanism. As a result, the lock rod can be lifted to the release position, and the distribution device can be carried into and out of the distribution board without any problem.

The embodiment of the present invention will be described below based on the examples shown in FIGS. 1 to 5 by taking the above-described drawer type grounding device as an example of the power distribution equipment installed in the switchboard.
First, FIGS. 5A and 5B show the overall configuration of the grounding device. In the figure, 1 is a switchboard (closed switchboard), 2 is a cradle built in the panel, 3 is a drawer type grounding device mounted on the cradle 2, 3a is a vacuum circuit breaker as an opening / closing part of the grounding device, and 3b is a vacuum circuit breaker 3a is an opening / closing operation handle, 3c is a handle, 3d is a wiring plug for connecting the grounding device 3 to a control power source through a cable (not shown) wired in the panel, 3e is a carriage, 4 is pulled out from the grounding device 3 to the back A main circuit disconnecting portion 5 provided on the back wall of the cradle 2 corresponding to the terminal electrode, 5 is a main circuit bus, and 6 is a ground bus.
Here, the grounding device 3 mounts the carriage 3e on the rail 2a laid on the bottom of the cradle 2, and "disconnection position" A (the terminal electrode of the grounding device 3 and the vacuum circuit breaker main circuit disconnecting portion 4 are separated). And “connection position” B (the terminal electrode of the grounding device 3 is connected to the main circuit disconnecting portion 4). Further, as a locking device for hooking the grounding device 3 to the “disconnection position” A and “connection position” B, the cart 3e of the grounding device 3 is connected to a drawer lever 7 which is manually operated from the front. A vertically movable lock rod 8 is arranged on the bottom side of the cradle 2 so as to face the lock rod 8 at a position corresponding to “disconnection position” A and “connection position” B, and the lock rod 8 is latched. Further, on the cart of the grounding device 3, as a main part of the present invention, the drawer lever 7 is always automatically locked in the locked position, and the grounding device 3 is carried into the switchboard 1 or It is equipped with a lever locking mechanism 10 (with a detailed structure of the lever locking mechanism 10 to be described later) having a lock function that allows the locking to be manually released when it is carried out. In addition, 3f is a blind cover provided on the front surface of the grounding device 3 in order to restrict access by the outsider to the lever locking mechanism 10.

With the above configuration, during normal times (when the main circuit bus 5 is in a live state), the grounding device 3 is pulled out to the “disconnection position” A in the panel, and the lock rod 8 is hooked on the lock plate 9 at this position to lock it. is doing. In this state, the lever locking mechanism 10 locks the drawer lever 7 in the locked position so that the lock bar 8 cannot be lifted and released manually.
On the other hand, when conducting an internal inspection of the switchboard, turn off the power distribution equipment such as circuit breakers and disconnectors installed in the panel and disconnect the main circuit bus 5 from the external power system, and then from the panel side. The unlocking command (electric signal) is given to the lever locking mechanism 10 to release the locking of the drawer lever 7. Next, the drawer lever 7 is manually operated from the front of the grounding device 3 to pull up the lock rod 8, disengage from the lock plate 9, and then push the grounding device 3 from the “disconnection position” A into the interior of the panel. Then, it moves to the “connection position” B. At this position, the lock rod 8 is lowered again and hooked on the lock plate 9, and the drawer lever 7 is automatically locked to the lock position by the lever lock mechanism 10. Thereafter, the handle 3b of the grounding device 3 is turned on to close the vacuum circuit breaker 3a, and the main circuit bus 5 is connected to the ground bus 6 via the vacuum circuit breaker 3a to ground the main circuit in the panel. To do.

  Next, the entire structure of the lever locking mechanism 10 is shown in FIG. 2 to FIG. 4, and the main part structure is shown in FIG. In other words, the lever locking mechanism 10 is connected to the drawer lever 7 (the rear end of the drawer lever 7 is pivotally supported by the support shaft 7 a and extends forward) via the coupling plate 12 and the coupling lever 13. The locking cam 14, the tilting locking claw piece 15 (magnetic material) that locks the drawer lever 7 in the locked position (the lock rod 8 is lowered) by locking the locking cam 14, and the locking claw An electromagnet 16 for separating the locking claw piece from the lock cam 14 by a suction operation using the piece 15 as an armature, an adjustment stopper 17 for regulating the tilting range of the locking claw piece 15, an assembly frame 18 assembled with these members, and It is composed of an assembly of a push button type unlocking operation rod 19 which is assembled on the opposite side of the electromagnet 16 (front side of the grounding device 3) so as to face the locking claw piece 15.

Here, the locking cam 14 is formed with an engaging step portion with the locking claw piece 15 on the circumference of the disk, is pivotally supported by the support shaft 14a, and is connected to a long hole opened on the plate surface. 13a is inserted and connected to the connecting lever 13. Further, the lower end of the locking claw piece 15 is pivotally supported by the support shaft 15a, and the tip claw portion is pressed and urged toward the lock cam 14 by the return spring 15b. Further, the operating rod 19 for release faces the operating end of the blind lid 3f (see FIG. 5B) disposed on the front surface of the grounding device 3, and is normally removed from the locking claw piece 15 by the return spring 19a. It is held so as to stand by at the position where it has left.
4 is a terminal block of the electromagnet 16, which is wired to the wiring plug 3d shown in FIG. 5, and the unlocking release command given from the outside in a state where the control cable on the switchboard side is connected to the wiring plug 3d. Based on the above, an exciting current is applied to the operation coil of the electromagnet 16, and the engaging claw piece 15 which also serves as an armature is driven to the released position by the attraction operation, thereby unlocking the drawer lever 7.

  Next, the operation of the lever locking mechanism 10 will be described with reference to FIGS. FIG. 1A shows a state in which the locking cam 14 is locked by the locking claw piece 15 and the drawer lever 7 is locked in the locked position. Here, as described with reference to FIG. 5, in the state where the grounding device 3 is housed in the switchboard and the control cable is connected to the wiring plug 3 d of the grounding device 3, the “disconnection position” in which the grounding device 3 is designated in the panel. When moving between A and “connection position” B, first, the electromagnet 16 of the lever locking mechanism 10 is excited by an unlocking command given to the grounding device 3 from the outside through the control cable. As shown in FIG. 1B, the engaging claw piece 15 is driven to the released position by the suction operation, and the engagement with the lock cam 14 is released. As a result, the lock cam 14 becomes free, and the drawer lever 7 is manually operated from the front, and the lock bar 8 is lifted from the locked position shown in FIG. 4A to the release position shown in FIG. By disengaging the plate 9, the grounding device 3 can be moved from the “disconnection position” A to the “connection position” B, or conversely from the “connection position” B to the “disconnection position” A. When the pull-out lever 7 is lowered after the grounding device 3 is moved and the lock bar 8 is hooked on the lock plate 9, the lock cam 14 of the lever locking mechanism 10 is rotated in the clockwise direction and is spring-biased in the process. The latching claw piece 15 is engaged with the lock cam 14 and the drawer lever 7 returns to the auto-lock state shown in FIG.

On the other hand, when the grounding device 3 is carried into and out of the switchboard, the board-side control cable is not connected to the wiring plug 3d shown in FIG. 5, and therefore the electromagnet 16 of the lever locking mechanism 10 is in a non-excited state. Then, the drawer lever 7 and the lock rod 8 are locked in the locked position, and the drawer lever 7 cannot be pulled up to the release position in this state.
Therefore, in this case, the blind lid 3f (see FIG. 5) disposed on the front surface of the grounding device 3 is removed, the lever locking mechanism 10 is accessed from the front, and the operation rod 19 for unlocking is manually (fingertip). Push in. Thereby, as shown in FIG. 1C, the locking claw piece 15 pushed by the operating rod 19 is released from the lock cam 14 and the lock of the drawer lever 7 is released. Therefore, in this state, the drawer lever 7 is manually lifted and the lock rod 8 is lifted to the release position in FIG. 4B, and the grounding device 3 can be carried into and out of the switchboard without any trouble.

During normal times, the blind lid 3f is fixed at the closed position by fastening bolts, etc., so that the release operating rod 19 cannot be accessed from the front. The lock can be prevented from being released unexpectedly.
In the illustrated embodiment, the application to the grounding device is described as an example. However, the locking device of the present invention is not limited to the application to the grounding device, but also to various power distribution devices such as a drawer type circuit breaker. The implementation can be similarly applied.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the structure and operation | movement of the lever locking mechanism which comprises the locking device of this invention Example, (a) is the locked state of a drawer lever, (b) is the state which canceled the locking by the command from the outside (C) is a figure showing the state which canceled the lock manually. Side view showing the entire structure of the lever locking mechanism shown in FIG. Plan view of FIG. FIG. 3 is a front view of FIG. 2, (a) and (b) are diagrams illustrating a state in which the lock rod is locked and held at the release position, respectively. BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the whole apparatus showing the state which mounted the grounding device by the Example of this invention in the cradle, and was accommodated in the switchboard, (a), (b) is a side view, respectively, and a front view

Explanation of symbols

1 switchboard 2 cradle 3 grounding device (distribution equipment)
3e Dolly 4 Main circuit disconnection part 7 Drawer lever 8 Lock rod 9 Lock plate 10 Lever locking mechanism 14 Lock cam 15 Locking claw piece 16 Electromagnet 19 Release operation rod

Claims (4)

A drawer-type power distribution device with a carriage mounted on a cradle and housed in a switchboard is hooked at the “connection position” or “disconnection position” with the main circuit disconnection section behind it, and the latch is released by an external command. A drawer type power distribution device locking device that allows the power distribution device to move between "connection position" / "disconnection position"
A lock rod mounted on the cart of the power distribution device in combination with a manually operated drawer lever, and a lock that is placed on the bottom side of the cradle and latches the lock rod at a position corresponding to the “connection position” and “disconnection position” An auto-lock lever locking mechanism that is linked to the plate and the drawer lever and normally locks the lever in the locked position, and releases the lock by an electromagnet attracting operation in response to an external command. And a lock for the drawer-type power distribution device, characterized in that it is provided with a manual lock release means attached to the lever lock mechanism so that the lock of the drawer lever can be released manually. apparatus. 2. The locking device according to claim 1, wherein the lever locking mechanism includes a locking cam linked to a drawer lever, a locking claw piece that also serves as an armature of an electromagnet that locks the locking cam in a locked position, and the locking claw piece. A return spring that urges the locking claw toward the locking position with the cam lock, an electromagnet that drives the locking claw piece to a locking release position by a suction operation that receives an external command to perform excitation, and a manual locking As a release means, a chain of a drawer-type distribution device characterized in that it becomes an assembly with a push-button type release operation rod arranged opposite to the locking claw piece with its operation end facing the front side of the distribution device Locking device. 3. The lock device for a drawer type power distribution device according to claim 2, wherein a blind cover is provided on a front surface of the power distribution device so as to cover an operation end of the release operation rod. 2. The locking device for a drawer-type power distribution device according to claim 1, wherein the power distribution device is a grounding device for grounding a main circuit of the power distribution panel.

Images