JPS6146105A - Locking device of plug for control circuit in drawer type switchboard - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] - The present invention relates to a draw-out type switchboard equipped with a draw-out type circuit breaker, and particularly relates to a locking device for a control circuit plug thereof.

(Technical background of the invention and its problems) Generally, the control circuit connection method of a draw-out type circuit breaker includes:
There are three types: terminal block connection, plug connection, and automatic connection. Among these, plug connection and automatic connection are mainly used.

Of these, the automatic connection connection is functionally ideal, but the automatic connection connection is expensive, so a plug connection is often used.

However, in the case of a simple plug connection, the control circuit plug can be freely connected and disconnected regardless of whether the drawer-type circuit breaker is in the disconnection position, test position, or operating position. If the circuit plugs become separated, the circuit breaker cannot be opened or closed by electrical operation, which poses a problem that could lead to a serious accident.

(Object of the Invention) The present invention eliminates the problems in the conventional circuit breaker described above, and the draw-out type circuit breaker cannot be moved to the test position and the operating position unless the control circuit plug is in the connected state. Moreover, it is an object of the present invention to provide a locking device for a control circuit plug in a drawer-type power distribution board, which prevents the plug from being pulled out, that is, disconnecting, when the drawer-type circuit disconnector to which the plug is connected is in the test position or operating position. do.

[Summary of the Invention] The present invention provides a drawer-type circuit with a movable stopper that is biased downward by a spring, and a main circuit terminal that is spaced apart from a main circuit fixed terminal on the switchboard side. a recess into which the stopper fits and prevents the circuit breaker from moving toward the main circuit fixed terminal when the circuit breaker is in the fixed position; and an opening provided in the control circuit fixing plug. A movable baffle plate is provided which is biased upwardly by a spring to prevent the lock pin provided on the movable plug from being inserted into the opening, and which allows the lock pin to be inserted into the opening when the movable plug is lowered to a position where it fits into the recess. When the lock pin is fully inserted into the opening, the stopper rises against a spring and is released from the recess, and the baffle plate rises due to the spring to prevent the lock pin from being removed. It is characterized by

[Embodiments of the invention]

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 5 shows a drawer-type power distribution board to which the control circuit plug locking device of the present invention is applied. Main circuit fixed terminals 3.3 are protruded from the fixed wall 2 of the power distribution board body 1, and the power distribution board The drawer-type circuit breaker 5 that runs on the floor 4 of the main body 1 is provided with a protruding main circuit terminal 69.6 that can be brought into contact with and separated from the main circuit fixed terminal 3.3. A fixed plug 7 for a control circuit is provided at the front of the circuit breaker 5', and this fixed plug 7 has a movable plug 7 for a movable control circuit connected to a position (not shown) of the switchboard. A plug 8 is detachably attached.

6A and 6B show details of this movable plug 8. A movable plug 8 is provided protruding from the tip of a cable 9 led out from a switchboard, and this movable plug 8 is attached to a fixed plug 7. It has a frame-shaped plate body 10 that fits. Also,
A lock pin 11 projecting forward is provided on the plate body 10, and an original groove 12 is formed at an axially intermediate position of the lock pin 11.

Returning to FIG. 5, on the floor 4 of the switchboard main body 1, a stopper (to be described later) of the locking device, 1
3 and a recess 15 into which the baffle plate 14 can fit are formed.

Details of the locking device of the invention are shown in FIGS. 1-4.

In FIGS. 1 to 4, a substantially L-shaped mounting plate 16 is fixed to a drawer-type circuit breaker (not shown).
A fixing plug 7 with which the plate body 10 of the J plug 8 is fitted is protruded from the upper part of the mounting plate 16, and the lock pin 11 is inserted into the side of the fixing plug 7. An opening 17 is formed. Further, a guide tube 18 is provided protruding from the back of the opening 17.

A bracket 19 is provided projecting from the lower part of the mounting plate 16, and a pair of guide pins 20, 20 are provided projecting from the bracket 19 at intervals in the vertical direction. −・
On the other hand, the plate-shaped stopper 13 in which a pair of long holes 21.21 in the longitudinal direction into which these guide pins 20° 20 fit are formed at intervals in the longitudinal direction is the guide pin 20.20.
The stopper 13 is disposed so as to be movable in the vertical direction along the lower end thereof, and the lower end of the stopper 13 fits into the recess 15 in the lowered position. Another bracket 22 is protruded from the upper part of the mounting plate 1°6, and a support @ 23 is protruded from this racket 22, and the support shaft 23 is connected to the above-mentioned bracket through a support plate 24. A drive arm 25 protruding from the rear of the kite tube 18 is provided. In addition, the support plate 2
4 is connected to the upper end of the stopper 13 via a connecting pin 26, and when the lock pin 11 inserted through the guide tube 18 rotates the drive arm 25 clockwise in FIG. 1B, the stopper 13 is pulled up following this, and the lower end of the stopper 13 is released from the inside of the recess 15.

A guide pin 2 is installed on the mounting plate 1°6 above the opening 17.
7 is provided protrudingly, and three longitudinal elongated holes 21.21.28 into which this guide pin 27 and the guide pin 20.20 fit, respectively, are formed at intervals in the longitudinal direction. 2 orthogonal in the horizontal plane at the position
The baffle plate 14, which is made up of two plate bodies 29 and 30, is arranged to be movable in the vertical direction. The lower end of this baffle plate 14 fits into the recess 15 in its lowered position, and at this time, the circular opening 31 formed in the baffle plate 14 coincides with the opening 17 and the lock pin 11 can be inserted into the opening 17. Furthermore, there are three notches 32 on the lower edge of the circular opening 31 that prevent the lock pin 11 from passing through but can fit into the annular groove 12 of the lock pin 11! l! It has been iQed. Further, a handle 33 is provided protruding from the baffle plate 14.

A tension coil spring 34 extending in the vertical direction is interposed between the stopper 3 and the baffle plate 14, and the coil spring 34 is attached to the stopper 3 at a position above the baffle plate 14. Therefore, the stopper 3 is always urged downward, and the baffle plate 14 is always urged upward.

Next, the operation of the above-described embodiment will be explained.

1A and 1B show the state before the movable plug 8 is connected to the fixed plug 7, and the lower end of the stopper 13 protrudes into the recess 15 and engages with the stepped portion 15a of the recess 15, so it is shaped like a drawer. It is not possible to move the circuit breaker 5 to the test and operating positions. In order to connect the movable plug 8 to the fixed plug 7, the circular opening 31 of the baffle plate 14 is connected to the opening 17 by pushing up the handle 33 and lowering the baffle plate 14 as shown in FIGS. 2A and 2B. Overlap, baffle plate 14
The lower end portion of protrudes into the recess 15 . Next, as shown in FIGS. 3A and 3B, the movable plug 8 is made to face the fixed plug 7,
By inserting the lock pin 11 into the guide cylinder 18 through the opening 17 and connecting both plugs 7.8, the drive arm 25 is pushed by the lock pin 11 and rotates clockwise, and the stopper 1
3 rises and is released from the recess 15. However, since the baffle plate 14 protrudes into the recess 15 due to the engagement of the opening 31 and the lock pin 11, it is not possible to move the 1!1 opener 5 to the test position and the operating position due to the pull-out circuit. . When the movable plug 8 is further inserted and both plugs 7.8 are completely connected to the state shown in FIG.
The notch 32 of the baffle plate 14 matches the groove 12 of the baffle plate 1.
4 is pulled up by the coil spring 34, the notch 32 fits into the groove 12, and the two plugs 7.8 cannot be separated.

On the other hand, the baffle plate 14 is also released from the recess 15, making it possible to move the drawer type circuit breaker 2S5 to the test position or the operating position.

In order to separate the movable plug 8 from the fixed plug 7, it is necessary to push down the baffle plate 14 with the handle 33, but when the drawer type circuit breaker 5 is in the test position or the operating position, the baffle plate 14 is pushed down into the recess 15. Since they are not facing each other, the baffle plate 14 cannot be pushed down. Therefore, in order to separate the plugs 7, 8, the circuit breaker 5 must necessarily be moved to the disconnected position. If the handle 33 is pushed down when the circuit breaker 5 is in the new path position, the lower end of the baffle plate 14 will protrude into the recess 15, and the engagement between the groove 12 of the opening pin 11 and the notch 32 will be released. , the movable plug 8 can be removed from the fixed plug 7.

As described above, according to this embodiment, if the circuit breaker 5 is not in the disconnection position, that is, the stopper 13 and the baffle plate 14 are not in the position facing the recess 15, the movable plug 8 for the control circuit is closed.
and fixed plug 7 cannot be attached or detached, and both plugs 7
．． Since the circuit breaker 5 cannot be moved to the test position or the operating position unless the circuit breaker 8 is connected correctly, safety and reliability can be improved.

In the embodiment described above, the downward biasing of the stopper 13 and the upward biasing of the baffle plate 14 were performed by one spring 34, but two springs may be provided separately. good.

〔Effect of the invention〕

As explained above, the locking device for the control circuit plug in J3 of the drawer-type circuit switchboard according to the present invention has a stopper movably biased downwardly by a spring on the drawer-type circuit breaker, and A concave portion is provided so that when the circuit breaker is located at a position where the main circuit terminal is spaced apart from the main circuit fixed terminal, the stopper becomes one size larger and prevents the circuit breaker from advancing toward the main circuit fixed terminal. The lock pin provided on the movable plug is urged upward by a spring to prevent the lock pin provided on the movable plug from being inserted into the flap opening, and is lowered to a position where it fits into the recess. Then, a baffle plate is movably provided that allows the lock pin to be inserted into the opening, and when the lock pin is fully inserted into the opening, the stopper rises against the spring and is released from the recess, and the stopper is released from the recess. Since the baffle plate is raised by a spring to prevent the lock pin from being removed or removed, both plugs for the control circuit cannot be connected or removed unless the draw-out circuit breaker is in the disconnected position, and both plugs are connected correctly. Otherwise, the circuit breaker cannot be moved to the test position or operating position, which has the effect of improving safety and reliability.

[Brief explanation of drawings]

Figure 1 A, B, Figure 2 A, B, Figure 3 A, B, No. 4
Figures A and 13 are diagrams showing the embodiment of the locking device for a control circuit plug according to the present invention in different states, and 8 in each figure is a front view, 8 in each figure is a side view, and FIG. 6 is a schematic diagram of a switchboard to which the locking device of the present invention is applied, FIG. 6 is a front view of a movable plug, and FIG. 6B is a side view of FIG. 6A.
DESCRIPTION OF SYMBOLS 1... Switchboard main body, 7... Fixed plug, 8... Movable plug, 11... Lock pin, 12... Annular vortex,
13...S1~Brim, 14...Baffle plate, 15...
Recessed portion, 16... Recessed portion, 17... Opening, 25...
- Drive arm, 31... circular opening, 32... notch, 34... coil spring. Applicant's agent Kiyoshi Inomata Figure 1 A s Figure 2 A B Figure 3 A B Figure 4 A B Figure 5 Figure 6

Claims (1)

[Claims] A draw-out type circuit breaker with a main circuit terminal that can be connected to and separated from a fixed main circuit terminal is arranged so as to be movable, a fixed plug for a control circuit is provided on the circuit breaker, and a movable plug for the control circuit is provided on the circuit breaker. In the draw-out type switchboard, the circuit breaker is movably provided with a stopper biased downward by a spring, and the circuit breaker is movably provided at a position where the main circuit terminal is spaced apart from the main circuit fixed terminal. The switchboard is provided with a recess into which the stopper is inserted to prevent the circuit breaker from moving toward the main circuit fixed terminal when the circuit breaker is present, and a lock pin provided on the movable plug connects to the opening provided on the fixed plug. A movable baffle plate is provided which is biased upward by a spring to prevent the lock pin from being inserted into the recess, and which allows the lock pin to be inserted into the opening when the lock pin is lowered to a position where the lock pin is inserted into the recess. Control in a drawer-type switchboard characterized in that in the inserted state, the stopper rises against a spring to be released from the recess, and the baffle plate rises by the spring to prevent the lock pin from coming off. Circuit plug locking device.