JPH0540652Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an interlock device for a closed switchboard such as a control center.

[Conventional technology]

Generally, in a closed power distribution board such as a control center, a box-shaped panel frame is partitioned vertically into multiple levels using shelf boards to form multiple unit rooms, and each of these unit rooms has a control unit that can be pulled out. It is stored. Here, the control unit mounts various control devices such as breakers, electromagnetic contactors, and control relays on a common frame.
It is a circuit configured to perform a specified control function, and the main circuit and, in some cases, the control circuit are:
When the control unit is pulled out or inserted into the panel frame, it is automatically connected to and separated from the corresponding circuit on the panel frame side.

A contact is installed on the back of the control unit, and by pushing the control unit in, the power contact contacts the busbar (generally a vertical busbar) wired to the panel frame of the switchboard, and connects the busbar to each mounted Power is supplied to the device. Further, a load contactor contacts the load side terminal, and power that is switched on and off by the control unit is supplied to the load side.

In a closed switchboard equipped with such a pull-out type control unit, if the control unit is removed from the contact during load-side operation, an arc will occur between the busbar and the power contact, and the metal parts will melt. Otherwise, the conductive gas will cause a short circuit between the phases, resulting in an explosion, which is dangerous and can damage the control equipment.

Therefore, since the load side will not be operated if the breaker is off, it is necessary to provide an interlock device so that movement operations for connecting and separating the contacts cannot be performed when the breaker is on.

Conventionally, as described in Japanese Utility Model Publication No. 52-58433, for example, in a mechanism in which the contact insertion/extraction device moves the unit back and forth by rotating the insertion/extraction bolt on the unit, the insertion/extraction bolt is By shielding the front with a shielding plate,
Interlocking with the breaker is being attempted.

[The problem that the idea aims to solve]

However, the above-mentioned interlock device
Since the structure is such that the front side of the unit removal mechanism is shielded, the unit can be moved by inserting a tool such as a spanner from the side or top and bottom to rotate the attachment/detachment bolt, which poses a safety problem.

In addition, since the shielding plate slides left and right,
There was a problem in that the moving stroke was long, and the friction of the sliding part caused excessive force to be applied to the breaker external operating handle, making it difficult to turn on and off the breaker.

The present invention was devised in view of such conventional problems, and aims to improve safety and operability.

[Means to solve the problem]

In order to achieve this purpose, the interlock device for a closed power distribution board of the present invention installs a device mounting unit frame that can be moved in and out of the shelf board attached to the panel frame, and connects the bus bar wired to the panel frame with the device mounting unit frame. A contact mounting frame including a power supply contact that approaches and separates from the load side terminal and a load contact that approaches and separates from the load side terminal is installed so as to be movable in the contact and separation directions with respect to the unit frame, and A closure equipped with a lever interlocking mechanism that converts the rotational movement of an operating rod that is incorporated into a unit frame and receives the tip of an operating lever that is detachably inserted at the front of the unit frame into a moving movement in the approaching and separating direction of the unit frame. In the switchboard, an engaging portion is provided on the operating rod, a handle stopper having an engaging receiving portion that engages with the engaging portion is movably provided on the unit frame, and the handle stopper is movably provided on the unit frame to operate the breaker mounted on the unit frame. A handle cam that is interlocked with the rotating operation of the handle is interlocked with the handle stopper, so that when the operating handle is on, the engagement receiving portion of the handle stopper is engaged with the engaging portion of the operating rod. The feature is that an interlocking mechanism is provided.

〔Example〕

Hereinafter, the present invention will be specifically explained based on embodiments shown in the drawings.

1 to 7 show an embodiment of an interlock device for a closed switchboard according to the present invention.

Before explaining this embodiment, a closed switchboard to which the present invention is applied will be explained.
This is a structure previously proposed by the present applicant in Japanese Patent Application No. 180743/1983.

That is, FIGS. 8 and 9 are a cross-sectional plan view and a partial front view of the proposed closed switchboard. In these figures, 1 is a panel frame constituting the box of the switchboard, 2 is a shelf board fixed to the panel frame 1 in a required number of stages, and 3 and 4 are doors, respectively. A guide frame 2a is provided on the shelf board 2, and a unit frame 5 to which various devices are attached is attached to the panel frame 1.
It is inserted and mounted along the guide frame 2a from the front side of the guide frame 2a. Reference numeral 6 denotes a roller provided so that the unit frame 5 can be mounted with a light force. A contact mounting frame 9 having a power contact 7 and a load contact 8 on the back side of the unit frame 5 is attached to the unit frame 5.
The contacts 7 and 8 are movable in the direction toward and away from each other, that is, in the front-back direction. Both of these contacts 7 and 8 are wired to equipment mounted on the unit frame 5 using electric wires or the like (not shown).

The panel frame 1 is provided with, for example, a three-phase, four-wire bus bar 10 and a load-side terminal 11 to which the power contact 7 and the load contact 8 connect and separate.

Lock pins 12 are embedded in two places on the shelf board 2, and when the unit frame 5 is inserted into the shelf board 2, a lock pin 12 is attached to the unit frame 5 in the middle by a shaft 13a. The groove 13b on the front side (clockwise side) of 13 is engaged and cannot be separated. 14 is a spring for biasing the hook 13 clockwise and maintaining the engaged state, and 13c is a release lever for releasing the engagement.

As shown in FIG. 10, a protrusion 13d, a recess 13e, and a straight portion 13f are formed on the back side of the hook 13 to act on the actuator 24 fixed to the contact mounting frame 9 side. When the contact mounting frame 9 is in a disconnected position relative to the unit frame 5, the actuator 24 pushes the protrusion 13d against the biasing force of the spring 14, as shown in FIG. 10a. It is in a slightly rotated state around the shaft 13a. Therefore, the hook 13 is in a slightly retracted state with respect to the lock pin 12. In this state, the unit frame 5 is attached to the shelf board 2 together with the contact mounting frame 9.
When the lock pin 12 is inserted into the groove 13b, the lock pin 12, which is shown as a dashed line in FIG. calm down. When removing the unit frame 5 from the shelf board 5, push the release lever 13c by hand to the state shown by the dashed line, and the lock pin 12 and the hook 13 will be disengaged.
You can remove it smoothly by pulling on it.

When the contact mounting frame 9 is in the test position or connection position with respect to the unit frame 5, if the unit frame 5 is allowed to be inserted into the shelf board 2 as it is, the contacts will be directly connected to the power supply, which is dangerous. . Also,
Even if it were possible to pull out the unit frame 5 in the test or connection position from the shelf board 2, it would still be dangerous. For this reason, the contact mounting frame 9
When the actuator 24 is in the test position and the connection position with respect to the unit frame 5, the actuator 24 is attached to the straight part 1 on the back side of the hook 13, as shown in FIG. 10b.
3f. In the same figure,
The position of the actuator 24 shown by the solid line is the test position, and the position shown by the dashed line is the connection position. When the contact mounting frame 9 and the unit frame 5 are in this positional relationship, the hook 13 cannot be rotated by the actuator 24. Therefore, the hook 13 prevents the lock pin 12 fixed to the shelf board 2 from entering or leaving. As a result, in the state shown in FIG. 10b, the unit frame 5 cannot be attached to the shelf board 2, and the unit frame 5 in the attached state is
Since it does not move even if the release lever 13c is pressed,
It cannot be pulled out. In this way, insertion and removal of the contact at locations other than the intended disconnection position is completely prevented,
Improves safety.

An interlocking arm 16 is attached to the unit frame 5, which is rotatable about an interlocking arm rotation shaft 15 embedded in the unit frame 5 and drives a contact. is the drive shaft 17
is installed. The drive shaft 17 is inserted into an elongated hole 16a provided at the tip of the interlocking arm 16, and is freely engaged therewith. An operating rod 19 is fixed to the base end of the interlocking arm 16 to engage with an operating lever 18 for moving the contact mounting frame 9 to the test position and the connection position. The tip of the operating rod 19 faces an elongated hole 5b opened in the handle frame 5a on the front side of the unit frame 5.

The operating rod 19 has a built-in lock collar 21 that is pressed forward by a spring 20, and a guide hole 2 is formed in the center of the lock collar 21.
1a, and the tip of the operating lever 18 shown in FIG. 11 is inserted into this guide hole 21a. This operating lever 18 has an insertion portion 18a at the tip and a collar portion 18.
b, consisting of a small diameter portion 18c and a grip portion 18d. The grip portion 18d is coated with rubber. The diameter of this insertion portion 18a is set larger than the width of the elongated hole 5b formed in the grip frame 5a shown in FIG. 9, and smaller than the diameter of the cutout portions 5b-1, 5b-2, and 5b-3. has been done. In addition, the small diameter part 1
The diameter of 8c is set smaller than the width of long hole 5b. The diameter of the collar portion 18b is larger than the diameter of the guide hole 21a of the lock collar 21, and naturally
is larger than the width of the elongated hole 5b, and the notch 5b-
1, 5b-2, and 5b-3. As a result, the operating lever 18 cannot be inserted into the lock collar 21 at the positions of the long holes 5b in the middle other than the locations of the notches 5b-1, 5b-2, and 5b-3, and once inserted into the lock collar 21, It cannot be removed at a position in the middle of the elongated hole 5b, and can only be removed at the positions of the notches 5b-1, 5b-2, and 5b-3. In addition, this notch 5
At locations b-1, 5b-2, and 5b-3,
Due to the urging force of the spring 20, the lock collar 2
1 will be in a state where the tip slightly protrudes forward from this notch. The diameter of the tip of the lock collar is the notch 5.
The diameter is made slightly smaller than the diameters of b-1, 5b-2, and 5b-3, and when the protrusion is made, it can be fitted into the notch and locked.

Therefore, by inserting the tip of the operating lever 18 into the lock collar 21 and rotating the operating lever 18 to the right in the drawing while pushing it in, the contact mounting frame 9 is moved to the test position and the connection position. . The three large-diameter notches 5b-1, 5b-2, and 5b-3 of the elongated hole 5b in FIG. 9 indicate the disconnection position, the test position, and the connection position, respectively, and the operating lever is The tip of 18 can be inserted into and pulled out from the operating rod 19. Notch part 5b at the test position which is the intermediate position
-2 has another notch 5b-1 or 5b-3.
When approaching from the entrance, it swings to clear the path and the notch 5
Inspection position stoppers 22 and 23 are provided to prevent movement from b-2. This prevents the operating lever 18 from inadvertently moving from the test position to the disconnecting position or closing position, and prevents it from moving directly to the connecting position when attempting to move from the disconnecting position to the test position. When operating the operating lever 18, the stopper 2
By pushing the protrusion 22a or 23a of 2 or 23, the other end is raised, and the operating lever 18 is made to move freely. In addition, 25 in the figure is a contactor position display name plate, and the contactor operation mechanism, that is, the interlocking arm 16.
It displays the position of the contact and the position of the contact. The details are shown in FIG. 14.

Further, in the grip frame 5a, the operating rod 19 is operated at both ends of the elongated hole 5b, and when the tip of the operating rod 19 reaches the notch 5b-1 or 5b-3, the operating rod 19 is stopped. As shown in FIG. 15, stoppers 5c and 5d are provided. These stoppers 5c and 5d are connected to the operating rod 19.
The side slopes of the trapezoidal head are brought into contact with the trapezoidal head formed at the tip of the stopper 5c,
5d, it is made to abut at a substantially right angle to the stopper surface.

12 and 13 show the state in which the contact mounting frame 9 is moved to the test position and the connection position by operating the operating lever 18, respectively.

In the test position shown in FIG. 12, the power contact 7 is in contact with the bus bar 10 in order to supply power to the equipment mounted on the unit frame 5.
The load contactor 8 is located at a position that does not contact the load side terminal 11 and maintains a sufficient spatial distance for disconnection. Thereby, power can be supplied to the equipment to be tested without supplying power to the load.

In the connection position shown in FIG. 13, the power contact 7 and the load contact 8 are both connected to the bus bar 10 and the load side terminal 11, and are in a normal operating state.

As described above, with the closed switchboard shown in FIGS. 8 to 15, the unit frame 5 can be stored in a fixed position relative to the panel frame 1 where the door 3 can be closed, and the contact mounting frame 9 can be disconnected at that position. Can be operated into position, test position and connection position.

By the way, in a closed power distribution board, an operation handle is provided on the panel surface in order to turn on and off a built-in breaker. The interlock conditions between the operating handle and the contact mounting frame 9 in the present invention are as follows.

(1) When the breaker is on, the contact mounting frame 9 cannot be moved.

(2) When the breaker is off, the contact mounting frame 9 can be moved.

(3) When the breaker is in the tripped state, the contact mounting frame 9 can be moved.

The interlock device of the present invention was designed based on the above interlock conditions. FIG. 1 is a front view of the interlock mechanism between the operating handle and the operating rod when the breaker is off, and FIG. 2 is a side view thereof.

In these figures, 29 is a breaker, 30 is an operating handle of the breaker 29, 31 is an operating handle mounting frame, and 32 is a handle cam that rotates together with the operating shaft of the operating handle 30. This handle cam 32 has a protrusion 32a formed therein, and a pin 33 that slides into contact with the circumferential surface of the handle cam 32.
A lock arm 33 having a diameter of 1.a is rotatably installed on the operating handle mounting frame 31 about a pivot 33b as a fulcrum. In the figure, numeral 34 is a release such as a shutter release for a camera, into which a wire is slidably inserted. This release 34 has a spring (not shown) built therein, and in a normal state, the presser portion 34a protrudes due to this spring, and the operating portion 34b at the other end is in a pulled state.
When an external force, that is, the pushing part 33c of the lock arm 33 in FIG. 1 descends, the holding part 34a is pushed and the operating part 34b at the other end protrudes, and returns to its original position when the external force is removed. Since this release 34 is flexible, no intermediate support is required, and the arrangement is flexible.

A release mounting plate 35 whose upper part is bent into an L-shape is attached to the grip frame 5a of the unit frame 5.
The end of the outer tube 34c is fixed. A handle stopper guide 36 is also attached to the rear part of the release mounting plate 35 on the grip frame 5a, and a handle stopper guide 37 is installed between the handle stopper guide 36 and the release mounting plate 35.
is arranged so that it can be raised and lowered freely. The handle stopper 37 is provided with a vertically elongated hole 37a.
It is configured to be able to move up and down within the stroke range of the long hole 37a using the shaft of the mounting screw 38, which also serves as a stopper, as a guide. The handle stopper 37 is normally urged to the upper limit position by a spring 39.

A protrusion 19a is formed on the upper part of the operating rod 19, and a protrusion 19a is formed opposite to the protrusion 19a.
A recess 37b is formed in the handle stopper 37. The operating rod 19 has three positions as shown in FIG.
However, in any of these positions, when the handle stopper 37 is lowered, as shown in FIG. 6b, the recess 37b
Alternatively, both side portions 37c and 37d engage with the protrusion 19a of the operating rod 19 so that the operating rod 19 cannot be operated. In addition, in the "disconnection position" and "connection position", the protrusion 19a of the operating rod 19 is locked only on one side of the handle stopper 37, but both ends of the elongated hole 5b in the grip frame 5a are engaged with the stopper 5c. , 5d, the operating rod 19 is also locked at the other end, and its movement is reliably stopped.

Next, the operation of this device will be explained.

First, when the breaker 29 shown in FIGS. 1 and 2 is turned off, the protrusion 32a of the cam plate 32 and the lock arm
Since it is not engaged with the pin 33a at the base end of the lock arm 33, the pushing part 33c at the tip of the lock arm 33 is in the raised position by the holding part 34a which is raised by the spring built into the release 34. Therefore, in this state, the operating portion 34b of the release 34 is in a pulled state, that is, in a non-operating state, and the handle stopper 37 is raised by the spring 39. Therefore, the unit frame 5 can be operated by inserting and operating the operating lever 18 into the operating rod 19 while the recess 37b of the handle stopper 37 and the protrusion 19a of the operating rod 19 are not engaged. .

FIG. 3 shows the operating handle 30 rotated to the trip position. In this state, the cam plate 32 rotates a predetermined angle clockwise, but the protrusion 32a does not actuate the pin 33a at the base end of the lock arm 33, so the operating rod 19 is disengaged as in FIG. Therefore, the unit frame 5 is in an operable state.

Next, when the breaker 29 is on,
As shown in FIGS. 4 and 5, the cam plate 32 further rotates clockwise, and the protrusion 32a pushes the pin 33a of the lock arm 33. Then, the lock arm 33 receives a rotational force in the counterclockwise direction about the pivot 33b, and the pushing portion 33c descends.
As a result, the holding portion 34a of the release 34 descends against the spring force of the built-in spring, causing the operating portion 34b at the tip of the release 34 to protrude. As a result, the handle stopper 37 is pressed and moves down to the lower limit position against the biasing force of the spring 39. Then, the recess 37b of the handle stopper 37 engages with the protrusion 19a of the operating rod 19,
The operating rod 19 will be locked in a state where it cannot be operated.

Therefore, when the breaker 29 is on, the contact mounting frame 9 cannot be moved for pushing in or pulling out, and safety can be ensured.

In the above embodiment, an example is shown in which the handle stopper 37 and the lock arm 33 are linked by the release 34, but similar functions are
It can also be realized by other mechanisms.

FIG. 7 shows an example. In this embodiment, a lock arm interlocking plate 40 and a presser plate 41 are used to operate the handle stopper 37. That is, the lock arm interlocking plate 40
is guided to the operating handle mounting frame 31 so as to be movable up and down, and its lower end is connected to the intermediate portion of the presser plate 41. One end of the presser plate 41 is supported by the handle frame 5a by a shaft 41a, and the other end of the presser plate 41 is disposed such that an operating portion 41b abuts against the handle stopper 37. Its operation is the same as that of the previous embodiment, so a description thereof will be omitted.

[Effect of idea]

As explained above, in the present invention, an engaging portion is provided on the operating rod, and a handle stopper having an engaging receiving portion that engages with the engaging portion is movably provided on the unit frame, and the breaker is operated. The handle cam and the handle stopper are interlocked with each other when the handle is rotated. As a result, when the operating handle is on, the movement of the operating rod is restricted by the handle stopper. Therefore, it is not possible to move between the disconnection position, inspection position, and connection position while the breaker is on, and the drive for connecting and separating the contacts is restricted, making it possible to ensure safety. Become. Also,
Since most of the mechanical parts are covered, it is difficult to operate by pinching your hand or inserting a tool from the outside, unlike in the conventional structure, and dangerous work such as intentionally disengaging the interlock is prevented. , safety can be further improved.

[Brief explanation of the drawing]

Fig. 1 is a front view of an interlock device showing an embodiment of the present invention when the breaker is off, Fig. 2 is a side view at that time, Fig. 3 is a front view when the breaker is in the tripped state, and Fig. 4 is a front view when the breaker is on, FIG. 5 is a side view at that time, FIG. 6 is an explanatory diagram of the state of engagement with the handle stopper at each position of the operating rod, and FIG. 8 is a cross-sectional plan view showing an embodiment of the closed switchboard to which the present invention is applied, FIG. 9 is a front view of the main parts thereof, and FIG. 10 is a diagram showing the engagement between the hook and the lock pin. FIG. 11 is a perspective view of the operating lever, FIG. 12 and FIG. 13 are plan views showing the movement of the contactor unit in the test position and the connection position, respectively, and FIG. 14 shows details of the nameplate. The front view shown in FIG. 15 is an explanatory view showing the relationship between the operating rod and the stopper. 1... Board frame, 2... Shelf board, 3, 4...
Door, 3a...Opening, 5...Unit frame, 5a...
Grip frame, 5b...Elongated hole, 5b-1, 5b-2,
5b-3... Notch, 5c, 5d... Stopper, 6... Roller, 7... Power contact, 8... Load contact, 9... Contact mounting frame, 10... Bus bar, 11... Load side terminal, 12...Lock pin,
13...Hook, 13a...Shaft, 13b...Groove, 13c...Release lever, 13d...Protrusion, 13e...Recess, 13f...Straight part,
13g...cam part inclined surface, 14...spring,
15... Interlocking arm rotation shaft, 16... Interlocking arm, 16a... Long hole, 17... Drive shaft, 18...
Operating lever, 19... Operating rod, 19a... Protrusion, 20... Spring, 21... Lock collar, 22, 23... Stopper, 24... Operator, 25... Name plate, 29... Breaker, 30...
Operation handle, 31... Operation handle mounting frame, 3
2...Cam plate, 32a...Protrusion, 33...Lock arm, 33a...Pin, 33b...Pivot, 33
c...pushing part, 34...release, 34a...pressing part, 34b...actuating part, 34c...exterior tube, 3
5... Release mounting plate, 36... Stopper guide, 37... Handle stopper, 37a... Long hole, 37b... Recess, 37c, 37d... Side part,
38...Mounting screw, 39...Spring, 40...
... Lock arm interlocking plate, 41 ... Pressing plate, 41a
...shaft, 41b...actuating part.

Claims (1)

[Claims for Utility Model Registration] A device mounting unit frame is installed so that it can be taken in and out of a shelf board attached to a panel frame, and a power contact and a load are connected to and separated from a bus bar wired to the panel frame. A contact mounting frame provided with a load contact that moves toward and away from the side terminal is installed so as to be movable in the direction toward and away from the unit frame, and is incorporated into the unit frame and attached to the unit frame. In a closed switchboard equipped with a lever interlocking mechanism that converts the rotational movement of an operating rod that receives a tip of an operating lever that is detachably inserted at the front into a moving movement in a direction toward and away from the unit frame, the operating rod is provided with an engaging portion. a handle stopper having an engagement receiving portion that engages with the engagement portion is movably provided on the unit frame, and a handle cam that is interlocked with rotational operation of an operating handle of a breaker mounted on the unit frame. and the handle stopper to engage the engagement receiving part of the handle stopper with the engagement part of the operating rod when the operating handle is on. Interlock device for closed switchboards.