JPH1050179A - Switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent detachment of a handle at a position except three positions and temporarily stop a movable blade at the three positions without using a control electric power source by installing members which restrict respective lock pins to respectively control insertion and rotation of the handle. SOLUTION: In the case a movable blade is not at three positions; the close point and the open point of a circuit breaker provided with an earth switchgear and the close point of the earth switchgear; by a manual operation of the circuit breaker, a slide axis 44 is in the left by a cam 51 and a spring 51 and a restricting member 47 restricts lock pins 34, 42 for sliding and rotating down and hinders the insertion of a handle 29. In the case the blade is at one of three positions, the cam 51 releases the restriction of the member 47, so that the pin 42 is lifted up by a grip 43 and the handle 29 is inserted and the pin 34 is pushed up by a tapered face of the tip end of the handle, dropped in the circumferential groove 30, and joined with an operational axis 27. When the handle 29 is turned, the cam 51 again restricts the member 47 and hinders the handle 29 from being pulled out and at the same time, at the next position of the three positions, the tip end of the pin 42 is dropped to a lock hole 33 and the blade is temporarily stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching device, and more particularly to an improved interlock mechanism for a disconnecting switch with a grounding switch.

[0002]

2. Description of the Related Art A switching device is provided with a disconnecting switch with a grounding switch which combines a disconnecting switch and a grounding switch. The disconnecting switch with a grounding switch performs three operations of closing the main circuit, opening the main circuit, and grounding by stopping one movable blade at three positions.

FIG. 5 shows a configuration of a disconnector with a grounding switch in a conventional switchgear. This disconnector with a grounding switch can be operated by electric operation or manual operation.

[0004] First, the electric operation will be described. When a command to close the disconnector is given, the motor 1 rotates clockwise, and this rotational motion is reduced by the speed reducers 2 and 3,
The power is transmitted to a link mechanism 7 via a Geneva mechanism 6 including a Geneva driver 4 and a Geneva wheel 5, and the movable blade 8
Rotates from the “open” position to the “closed” position. As a result, the main circuit conductors 9, 10 are connected via the movable blade 8, and the disconnector is in a "closed" state.

When the movable blade 8 rotates to the "closed" position, the rotation of the movable blade 8 is stopped after the rotary seal 11 due to the engagement between the pin of the Geneva driver 4 and the slit of the Geneva wheel 5. To stop at an appropriate position. When the movable blade 8 stops, the limit switch 12 operates to stop the motor 1.

On the other hand, when a command to open the disconnector is given, the motor 1 rotates counterclockwise. Then, the blade 8 rotates in a direction opposite to the above, and the disconnector is opened.
, The limit switch 12 operates and the motor 1 stops. At this time, the rotation transmission is not blocked by the Geneva mechanism 6 and the rotation is transmitted to the position where the grounding switch is closed.

Next, the manual operation will be described. The three operations of "open" and "close" of the disconnector and "close" of the grounding switch can be performed manually, but the "close" operation of the grounding switch cannot be performed by electric operation. Opening disconnector
Only when the movable blade 8 completely occupies three positions of the "closed" position and the "closed" position of the earthing switch, the handle 15 is inserted through the insertion hole 14 formed in the front plate 13 or vice versa. An interlock mechanism 16 that can be pulled out and cannot be inserted in the middle of it
Is provided. The interlock mechanism 16 is configured as shown in FIG. When the movable blade 8 is not at the third position, the lock coil 17 is demagnetized and the plunger 18 protrudes to engage with the lock lever 20 integrated with the shutter 19 that closes the insertion hole 14. It cannot be inserted into the insertion hole 14. At this time, the characters “locked” written on the display nameplate 21 become visible from the window 22. On the other hand, when the movable blade 8 occupies three positions, the lock coil 17 is excited, the plunger 18 is retracted, and the engagement with the lock lever 20 is released. Therefore, if the pin 23 is moved upward against the urging force of the spring 24, the shutter 19 can be rotated clockwise. Then, the insertion hole 14 is opened, and the character “release” on the display nameplate 21 is displayed on the window 22, and the handle 15 can be inserted into the insertion hole 14 and connected to the operation shaft 27. By turning the handle 15 in either direction, the movable blade 8 can be operated. When the movable blade 8 is brought into contact with the ground terminal 26, the ground state is established. When the movable blade 8 occupies a position other than the three positions, the interlock mechanism 16 operates so that the handle 15 cannot be pulled out. That is, during the manual operation, the lock coil 17 is demagnetized, the plunger 18 is engaged in the groove 25 of the handle 15 as shown in FIG. Is done. For this reason,
When the handle 15 starts to be turned, the display of the window 22 is “released”.
To "locked" and becomes "locked" in the middle of the position other than the 3rd position, and becomes "released" at the 3rd position. When the movable blade 8 tightens any one of the three positions and the display becomes “released”, the handle 15 can be pulled out.

As described above, since the movable blade is operated by a single operation mechanism so as to occupy three positions, it is necessary that the handle can be attached and detached only at the specified three positions and cannot be attached or detached during the operation. . In order to satisfy this condition, an interlock mechanism using a lock coil is conventionally provided.

[0009]

However, since the locking coil is used, the interlock mechanism does not operate without a control power supply. In addition, since there is no stop mechanism that temporarily stops when the movable blade is rotated to each position, the disconnector passes from the “closed” position to the “open” position, and goes from the “closed” position to the grounded switch at a stretch. There is a risk of turning.
Furthermore, since the part that locks the lock lever mechanically is the plunger of the lock coil, the plunger must be enlarged, and there is a problem that the lock coil itself becomes large.

Therefore, an object of the present invention is to provide a switchgear which solves the above problem.

[0011]

According to a first aspect of the present invention, a circumferential groove and a lock hole are formed in a handle, while the circumferential groove and the lock hole are inserted into the circumferential groove to form the handle. When the slide lock pin for preventing attachment / detachment and the movable blade occupy three positions, the lock pin for rotation enters the lock hole and temporarily stops the rotation of the handle. A restraining member for restraining or releasing the lock pin is provided. The restraining member is provided with an engagement hole for engaging with both lock pins, and is movably provided to restrain and release both lock pins. A cam for releasing both lock pins by pressing the restraining member only when the lock pin is occupied and for synchronizing the cams to interlock and connect to the operation shaft to manually move the lock pin for rotation When the movable blade occupies three positions and the rotation lock pin is opened, the rotation lock pin is moved to the handle side against the urging force to hold the rotation lock pin. A concave portion is formed on the outer peripheral surface on the cam side, and a holding pin whose tip is urged toward the concave portion is attached to the restraining member.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

FIGS. 1 to 3 show the structure of an interlock mechanism of a disconnector with a grounding switch in a switchgear according to the present invention. This interlock mechanism, when manually operating the disconnecting switch with a grounding switch, the handle can be attached and detached only at the above three positions, cannot be attached or detached during the operation, and temporarily stops the movable blade at each position, It is not allowed to pass as it is.

A handle 29 shown in FIG. 4 is used as a handle for coupling to the operation shaft 27. A circumferential groove 30 is formed on the outer peripheral surface near the distal end of the handle 29, and tapered surfaces 31 and 32 are formed on the side surface of the circumferential groove 30 and the distal end of the handle 29. A lock hole 33 penetrating in the diametrical direction is provided at a position slightly away from the circumferential groove 30.
Are formed.

The circumferential groove 30 of the handle 29 is
The movement of the handle 29 in the axial direction is restricted so that the handle 29 cannot be inserted or removed at any position other than the three positions. FIG. 1 (b)
As shown in FIG. 7, when the handle 29 is connected to the operation shaft 27, the guide holes 3 formed in the support plates 35, 36 are formed by the slide lock pins 34, the ends of which face the circumferential grooves 30.
It is supported movably in the axial direction of the pin via 7, 38,
A spring 39 as a first urging means for pressing the slide lock pin 34 downward is provided with a spring receiver 40 and a support plate 35.
And provided between them. 41 is a stopper. Also, at a position facing the lock hole 33 in the handle 29,
A rotation lock pin 42 is provided to restrain the rotation of the handle 29 in a state where the handle 29 is urged downward in a manner parallel to the slide lock pin 34 and similarly to the slide lock pin 34. A handle 43 is provided on the rotation lock pin 42 so that it can be manually moved in the axial direction against the urging force of the spring 39.

Lock pins 34 and 42 for slide and rotation
The slide shaft 44, which is long in a direction perpendicular to the
It is slidably supported via a guide hole formed in 6. To one end of the slide shaft 44, a restraining member 47 for restraining or releasing the sliding and rotating lock pins 34 and 42 so as not to move in the axial direction of the pins is fixed. The restraining member 47 is formed by bending a flat plate into an L-shape. One side is fixed to the slide shaft 44, and the other side is provided with engaging holes 48, 49 for inserting the sliding and rotating lock pins 34, 42. Is formed. The lock pins 34 and 42 for sliding and rotation are formed such that a small diameter portion in the drawing is circular in cross section and a large diameter portion is square in cross section, and the slide shaft 44 is moved to the left as shown in FIG. 3C, the circular cross section engages with the semicircular portions of the engagement holes 48, 49 as shown in FIG. 3C, and the slide and rotation lock pins 34, 42 are restrained. You. A roller 50 is rotatably provided at the other end of the slide shaft 44,
A cam 51 as a synchronizing means that engages with the roller 50 is provided fixed to the connection shaft 52. The cam 51 is formed in a shape having three vertices, and the connecting shaft 52 is interlocked and connected to the operation shaft 27 by synchronizing the position of the vertex to press the roller 50 each time the movable blade 8 occupies the three positions. ing. A spring 54 is provided between the support member 46 and the spring receiver 53 as a second urging means.

When the movable blade 8 occupies three positions and the lock pin 42 for rotation is opened, the lock pin 4 for rotation is used to lift and hold the handle 43.
A concave portion 56 is formed on the outer peripheral surface of the cam 2 on the cam 51 side, and one end of a sleeve 57 parallel to the slide shaft 44 is fitted and fixed to a portion of the restricting member 47 parallel to the rotation lock pin 42. The holding pin 58 is inserted through the sleeve 57. Insert the tip of the holding pin 58 into the recess 5
The spring receiver 59 and the restraining member 4
A spring 60 as a third urging means is provided between the spring 60 and the spring 7. A stopper 61 for retaining is formed at the rear end of the holding pin 58.

Next, the operation of the switching device will be described.
In order to manually operate the disconnector with a grounding switch, first, the handle 29 is inserted through the insertion hole 14 and connected to the operation shaft 27. At this time, if the movable blade 8 does not occupy any of the three positions, as shown in FIG.
1 does not press the roller 50, and the spring 54
4 has moved to the left in FIG.
As shown in FIG.
Lock pin 3 for slide and rotation on the semicircular part of 49
The lock pins 4 and 42 are inserted so that both lock pins are restrained from moving in the axial direction. Therefore, the lock pin 34 for slide is locked while being pressed downward, and the handle 29 cannot be inserted because it is obstructed by the lock pin 34 for slide. If the movable blade 8 occupies any one of the three positions, the cam 51 pushes the roller 50 as shown in FIG. 1 so that the sliding and rotating lock pins 34 and 42 are pushed as shown in FIG. It is released from the restraint member 47. For this reason, the rotation lock pin 42 can be raised by holding the handle 43 against the urging force of the spring 39, and when the rotation lock pin 42 is raised, the spring 60 moves rightward as shown in FIG. Since the tip of the holding pin 58 urged to fit into the concave portion 56, the rotation lock pin 42 does not drop. Then, the handle 29 is inserted into the insertion hole 14.
Insert Then, the slide lock pin 34 urged downward by the spring 39 is pushed up by the tapered surface 32 shown in FIG. 4, and when the insertion of the handle 29 is completed, the tip of the slide lock pin 34 is moved to FIG. It enters into the circumferential groove 30 as shown.

After that, when the handle 29 is rotated several times in either direction, the handle 51 is deviated from the three positions as shown in FIG.
Although the leading end of the lock pin 8 comes out of the concave portion 56, the lock pins 34 and 42 for sliding and rotation are restrained by the restraining member 47, and the lock pin 42 for rotation is restrained without descending. When the movable blade 8 occupies the middle of the three positions in the lowered state, the sliding lock pin 34 does not move, so the handle 2
9 cannot be removed.

When the movable blade 8 occupies any one of the three positions by further rotating the handle 29 7 to 8 times, FIG.
Lock pins 34 and 4 for sliding and rotating as shown in FIG.
2 is released, the rotation lock pin 42 restrained at the upper position is urged downward by the urging force of the spring 39,
When the movable blade 8 occupies one of the three positions, the tip of the rotation lock pin 42 enters the lock hole 33.
Therefore, when the movable blade 8 occupies any of the three positions, the rotation of the handle 29 is restricted, and the movable blade 8
When the robot arrives at any of the positions, it always stops.

In order to further rotate the movable blade 8 to the next three positions, the handle 43 is lifted and the concave portion 56 as shown in FIG.
Then, the handle 29 is turned after the holding pin 58 is fitted. Then, when the movable blade 8 comes to the next three positions, the rotation lock pin 42 descends again as shown in FIG. 1A, and the handle 29 is restrained.

When the movable blade 8 occupies three positions, the sliding and rotating lock pins 34 and 42 are opened as shown in FIG.
After raising the handle 2, the handle 29 may be pulled out. Since the lock pin 34 for sliding is not restrained, it can be pushed upward by the tapered surface 31 of the handle 29 and the handle 29 can be pulled out.

In this embodiment, the lock hole is a lock hole that penetrates the handle, but may be a recess without penetrating. Further, although the slide shaft is interposed between the restricting member and the cam, the restricting member may be directly pressed by the cam.

[0024]

As can be seen from the above description, claim 1
According to the opening / closing device according to
A slide / rotation lock pin to be opened is provided. When the movable blade occupies a position other than the three positions, a restraining member for restraining the slide / rotation lock pin is provided. And the action of temporarily stopping the movable blade at the three positions can be performed. Also, the holding pin and the recess are provided to hold the rotation lock pin against the urging force of the first urging means when the movable blade occupies three positions and the rotation lock pin is opened. In addition, there is no need to hold the rotation lock pin with the handle raised, which prevents erroneous operation and improves workability.

[Brief description of the drawings]

FIG. 1 is a left side view of a switchgear according to an embodiment of the present invention, showing a case where an interlock mechanism and a rotation lock pin of a disconnector with a grounding switch are not locked; (b) is a front view, and (c) is a view on arrow AA of (b).

FIG. 2 relates to an embodiment of a switchgear according to the present invention, and shows a case where an interlock mechanism of a disconnector with a grounding switch is not locked and a lock pin for rotation is locked. The left side view, (b) is a front view, (c) is the BB arrow view of (b).

FIGS. 3A and 3B relate to an embodiment of the switchgear according to the present invention, showing a case where an interlock mechanism of a disconnector with a grounding switch is in a locked state, wherein FIG. 3A is a left side view, FIG.
(C) is a CC view of (b).

FIG. 4 is a configuration diagram of a handle in an interlock mechanism of a disconnector with a grounding switch showing an embodiment of the switchgear according to the present invention.

FIG. 5 is a configuration diagram of a disconnector with a grounding switch in a conventional switchgear.

6A and 6B are views related to an interlock mechanism of a disconnector with a grounding switch in a conventional switchgear, wherein FIG. 6A is a plan view, and FIG.

7A and 7B are views showing a state in which a handle is inserted in an interlock mechanism of a disconnector with a grounding switch in a conventional switchgear, wherein FIG. 7A is a plan view and FIG.

[Explanation of symbols]

 Reference Signs List 8 movable blade 14 insertion hole 27 operating shaft 29 handle 30 circumferential groove 31, 32 tapered surface 33 lock hole 34 slide lock pin 39, 54, 60 spring 42 rotation lock pin 43 ... handle 44 ... slide shaft 47 ... restraining member 48,49 ... engaging hole 50 ... roller 51 ... cam 56 ... recess 58 ... holding pin

Claims (1)

[Claims] A movable blade occupies three positions of closing and opening a disconnector and closing a grounding switch by rotating the movable blade, and a handle is detachably attached to an operation shaft interlocked with the movable blade. In the switching device provided to constitute a disconnector with a grounding switch, a circumferential groove is formed on an outer peripheral surface of the handle, and a tapered surface is formed on a tip of the handle and a side surface of the circumferential groove to be separated from the circumferential groove. While a lock hole is formed in the diametric direction at the position, when the handle is mounted on the operation shaft, the slide lock pin whose tip faces the circumferential groove and the rotation whose tip faces the lock hole position in the handle axial direction. A lock member is provided so as to be movable in the axial direction of each pin in a state substantially parallel to each other and urged toward the handle via the first urging means. Is provided with an engaging hole for engaging and restraining the slide and rotation lock pins, and a restraining member is reciprocally movable in a direction for restraining and releasing the slide and rotation lock pins inserted through the engagement holes. Only when the movable blade occupies three positions, there is provided a cam that opens the lock pin for sliding and rotation by pushing the restraining member, and synchronizes the cam to interlock with the operation shaft to urge the restraining member toward the cam. And a handle for manually moving the rotation lock pin to the side opposite to the handle against the urging force of the first urging means, and the movable blade occupies three positions for rotation. When the lock pin is released, a concave portion is formed on the outer peripheral surface of the rotation lock pin on the cam side to move and hold the rotation lock pin toward the opposite handle side against the urging force of the first spring. While the concave An opening / closing device, wherein a holding pin whose tip is biased toward a portion is attached to a restraining member.