JPH1032904A - Interlock for drawer type switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the sure actuation of an interlock and, at the same time, to make the maintenance and inspection works of the interlock easier by attaching coils for interlock which drive interlock levers for inhibiting the movement of a drawer type switchgear, the interlock levers, and stoppers to common frames. SOLUTION: Coils 1 for interlock, interlock levers 3, and stoppers 5 which are engaged with the levers 3 are attached to common frames 10A and 10B. In addition, a switch 9 is attached to the frame 10A. When the levers 3 are actuated, the switch 9 is actuated to detect that the levers 3 are driven and, because of the detecting signal of the switch 9, electrical interlock becomes possible. Since the levers 3, the stoppers 5, the coils 1, and the switch 9 are attached to the frames 10A and 10B, the assemblage and attachment/detachment of the interlock become easier, and complicatedness can be eliminated in performing an assembling work and an inspecting work of the interlock.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interlock device for a drawer type switching device.

[0002]

2. Description of the Related Art A circuit breaker built in a cubicle has a drawer structure, and an operating position and a test position of the circuit breaker are present in the cubicle. When the circuit breaker is located at the operating position, the main circuit disconnecting portion is automatically connected, and when the circuit breaker is turned on in this state, the circuit breaker enters the operating state.
Further, when the tester is located at the test position, the circuit breaker can be tested for turning on and off. If the breaker is turned on while the breaker is in the test position and the breaker is moved to the operating position in this state, the current will flow through the breaker as soon as it is connected to the main circuit disconnection. When a short-circuit current flows, for example, an electromagnetic force acting in the main circuit disconnecting section causes a force to act in a direction in which the circuit breaker is pulled out of the cubicle, causing an abnormally large force to act on the operator or exposing the operator to an arc. Become dangerous. Conversely, a similar force acts when the circuit breaker in the energized state at the operating position is moved in the pulling-out direction. Therefore, the draw-out circuit breaker
An interlock device that can always prevent the pull-out operation is provided. That is, when the circuit breaker is in the test position or the operation position and the circuit breaker is in the closed state, a mechanical interlock that prevents the operation of pulling out the circuit breaker is performed, and in a position intermediate between the operation and the test, An interlock device is provided to prevent the mechanical and electrical breakers from being turned on.

FIG. 4 is a side view of a main part of a conventional interlock device of a draw-out type circuit breaker, FIG. 5 is a top view thereof, and FIG. 6 is a side view in a state where an interlock is released. An interlock device mounting frame having a plate portion B parallel to the side surface A is attached by a bolt (not shown) near the side surface A of the cubicle incorporating the draw-out circuit breaker. A pin 4 and a stopper 5 are protrudingly provided on the surface on the side opposite to the above. The pin 4 is provided with an interlock lever 3 having a base end side rotatably supported on the pin 4. A notch 31 is formed on the lower surface of the tip of the interlock lever 3.
The notch 31 and the protrusion 51 formed on the upper surface of the stopper 5 can be engaged and disengaged.

[0004] Further, a plate portion B of an interlock device mounting frame.
The interlock coil 1 having the yoke 1a is located on the surface of the cubicle opposite to the side A of the cubicle, and is attached to the plate portion B. Above the interlock coil 1,
A base plate is supported, and an adsorbing plate 2a that is adsorbed by the electromagnetic force of the interlock coil 1 is provided. A base end of a holding plate 21 having an inverted L-shape in side view is fixed to a front end side of the suction plate 2a, and a front end of the holding plate 21 has a contact plate 32 attached to a base end of the interlock lever 3. Is in contact with the upper surface of the Above the suction plate 2a, a suction plate stopper 1b that has a base end attached to the upper end side of the yoke 1a and regulates the upward movement range of the suction plate 2a is provided. An L-shaped connection plate 1c is attached to the tip of the suction plate stopper 1b via a coil spring SP, and the connection plate 1c is fixed to the upper surface of the suction plate 2a. The coil spring SP exerts a biasing force in a direction for separating the suction plate 2a from the interlock coil 1 on the suction plate 2a.

The circuit breaker BRK has an interlock lever 3
An interlock plate 6 having an inverted L-shape in front view is mounted at a height position where the interlock plate 6 comes into contact with the tip of the stopper 5, and an upper plate portion 6a of the interlock plate 6 is movably positioned above the tip of the stopper 5. When the interlock lever 3 is engaged with the stopper 5, the interlock plate 6 comes into contact with the interlock lever 3. When the interlock coil 1 is excited (demagnetized), the interlock coil 1 attracts (non-adsorbs) the attraction plate 2a, and the tip of the interlock lever 3 moves up (down). Further, various circuit cables (not shown) are tied to the interlock device mounting frame on which the interlock coil 1 is mounted.

Next, the operation of the interlock device will be described. When pulling out the circuit breaker BRK from the cubicle to the test position, the interlock coil 1 is demagnetized. At that time, the interlock lever 3 is in contact with the interlock plate 6, and the circuit breaker BRK can be pulled out in the direction of the arrow. Then, the circuit breaker BRK is pulled out, and FIG.
When the interlock plate 6 moves from the operation position indicated by the dashed line and passes through the position of the stopper 5, the tip of the interlock lever 3 moves down, and the notch 31
Engages with the projection 51. Then, the interlock plate 6 of the circuit breaker BRK comes into contact with the tip of the interlock lever 3, and erroneous insertion of the circuit breaker BRK into the cubicle is prevented, and the interlock state is established.

On the other hand, when the test is completed and the circuit breaker BRK is to be inserted into the cubicle, the insertion switch (not shown) is operated to excite the interlock coil 1. Then, the attraction plate 2a is attracted to the interlock coil 1 against the urging force of the coil spring SP by the electromagnetic force of the interlock coil 1, and the tip of the holding plate 21 moves downward as shown in FIG. As a result, the base end side of the interlock lever 3 is pushed down, and the interlock lever 3 rotates clockwise about the pin 4 as a fulcrum. Then, the tip of the interlock lever 3 moves upward, and the tip side of the interlock lever 3 is located above the interlock plate 6 so that the interlock of the circuit breaker BRK is released. Can be moved in the direction of the white arrow to the operating position indicated by the two-dot chain line in FIG.

[0008]

However, the conventional interlock device does not have a mechanism for detecting that the interlock device is operating reliably. Therefore, when inserting the circuit breaker into the cubicle, the conventional interlock device is moved. The motor control to be performed cannot be electrically interlocked, and the reliability is low. Also, since the interlock lever, stopper and interlock coil, which are parts of the interlock device, are mounted on the interlock device mounting frame that also fixes a plurality of circuit cables, it takes a long time to assemble the interlock device. In short, workability is poor. Further, when replacing parts of the interlock device, it is necessary to remove a plurality of circuit cables fixed to the interlock device mounting frame and remove the interlock device mounting frame from the cubicle. If you do
There is a problem that the work takes time.

SUMMARY OF THE INVENTION In view of the above problems, the present invention can detect that the interlock device is operating reliably, and does not bother the maintenance and inspection of the interlock device. The purpose is to provide.

[0010]

According to a first aspect of the present invention, there is provided an interlock device for a drawer-type opening / closing device, comprising: an interlock coil for driving an interlock lever for preventing movement of the drawer-type opening / closing device; A stopper that engages with the interlock lever is mounted on a common frame. In the interlock device of the drawer-type opening / closing device according to the second invention, a switch for detecting that the interlock lever has been driven is attached to the frame.

According to the present invention, when the interlock lever is operated, the switch is operated to detect that the interlock lever has been driven, and an electric interlock is enabled by the detection signal. Since the interlock lever, the stopper, the interlock coil and the switch are mounted on the common frame, assembly and detachment of the interlock device become easy. Thereby, erroneous insertion of the drawer-type switching device can be reliably prevented. In addition, it is possible to eliminate the troublesome work of assembling and checking the interlock device.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments of the present invention. FIG. 1 is a side view of a main part of an interlock device of a drawer-type opening / closing device according to the present invention, FIG. 2 is a top view thereof, and FIG. 3 is a side view when an interlock is released. Circuit breaker BRK built in cubicle not shown
Is installed so that it can be pulled out by a circuit breaker moving motor (not shown). In the cubicle, an interlock mounting frame (not shown) is mounted near the side surface A, and an L-shaped first frame 10A in a side view is detachably mounted on the interlock mounting frame using bolts. . First
The frame 10A is configured such that the lower end of the stopper mounting plate 10b is fixed to the end of the second frame mounting plate 10a, and the second frame mounting plate 10a and the stopper mounting plate 10b are orthogonal to each other.

The coil mounting plate portion 10c of the second frame 10B, which is formed in an L-shape when viewed from the front, is mounted on the second frame mounting plate portion 10a by bolts (not shown) via mounting bases 11,11. ing. On the upper surface of the coil mounting plate portion 10c, an interlocking coil 1 whose axial direction is orthogonal to the surface is mounted by bolts 12. Switch mounting plate 10 that stands perpendicular to coil mounting plate 10c
The microswitch 9 is mounted on the switch mounting plate 10d with the switch lever 9a positioned above between d and the interlock coil 1. The interlock coil 1 is formed with a yoke 1a made of a magnetic material having a predetermined thickness and a width substantially equal to the diameter of the interlock coil 1 and formed in an inverted L shape in side view. Yes,
The lower shaft end face of the interlock coil 1 is opposed to the lower face of the yoke 1a.

At the upper end side of the yoke 1a, the base end of the suction plate stopper 1b, which has a reverse J-shape in side view and is slightly wider than the yoke 1a, is fixedly attached. Plate stopper
The tip of 1b is located above the interlock coil 1 in order to regulate the upward movement range of the suction plate 2a. At the tip of the suction plate stopper 1b, an L-shaped connection plate 1c is attached via a coil spring SP, and this connection plate 1c is attached to the suction plate 2a.
Is fixed to the upper surface of. And coil spring SP
The urging force in the direction of separating the suction plate 2a from the interlock coil 1 is applied to the suction plate 2a. Yoke 1a
At the upper end surface of the suction plate 2a, the base end side of the suction plate 2a through which the base end side of the suction plate stopper 1b is inserted is supported and disposed,
The tip of the suction plate 2a is vertically movable with the upper end surface of the yoke 1a as a fulcrum.

When the interlock coil 1 is excited, the suction plate 2a is attracted to the upper shaft end face of the interlock coil 1 by electromagnetic force.
A holding plate with a crank shape in side view is on the tip side of the suction plate 2a.
The base end of the holding plate 20 is fixed, and the distal end side 20a of the holding plate 20 is located above the suction plate 2a. The switch mounting plate 10d of the second frame 10B has its upper end extending to a position higher than the upper end of the interlock coil 1. Further, the end face of the switch mounting plate portion 10d opposite to the end face facing the stopper 5 is cut out, so that the interlock coil 1 is formed.
A step 10e is formed at a height slightly higher than the upper end of the step. Further, a pin 4 protrudes from a surface near the upper end of the switch mounting plate portion 10d and on the side facing the interlock coil 1.

The pin 4 is provided with an interlock lever 3 rotatably supported on the pin 4 as a fulcrum. The lower surface on the distal end side of the interlock lever 3 is provided in a positional relationship facing the switch lever 9a of the micro switch 9. At the base end of the interlock lever 3, there is formed a cutout 3a having a cutout on the lower side. A spring pin 8 extending in the direction of the holding plate 20 protrudes from a tip end side of the interlock lever 3, and the spring pin 8 is located on a lower surface side of the holding plate 20. A coil spring 7 is stretched across the base end of the interlock lever 3 and the position of the switch mounting plate 10d near the stopper 5, and biases the base end of the interlock lever 3 downward. Have been. When the interlock coil 1 is not excited, the holding plate 20 is
Is moved upward, the suction plate 2a comes into contact with the suction plate stopper 1b, and the rotation of the interlock lever 3 is restricted. In this state, the notch 3a of the interlock lever 3 is cut.
The notch 5a formed in the stopper 5 is engaged with the notch 5a.

When the interlock lever 3 and the stopper 5 are engaged with each other, the interlock plate 6 mounted on the circuit breaker BRK abuts on the tip of the interlock lever 3 to prevent the movement of the circuit breaker BRK. It has become so. When the breaker BRK is inserted into the cubicle, the breaker BR
A drive circuit of a not-shown moving motor for moving K is controlled.

Next, the operation of the interlock device configured as described above will be described. When the circuit breaker BRK is in the operating position, the state in which the interlock plate 6 is located at the position shown by the two-dot chain line in FIG. 3 and the lower surface of the interlock plate 6 is in contact with the upper surface of the interlock lever 3 Has become. Here, when the pull-out switch of the moving motor is operated to pull out the circuit breaker BRK to the test position, the moving motor is driven and the circuit breaker BRK moves in the direction opposite to the arrow, and the interlock plate 6 becomes the interlock. The lever 3 slides on the upper surface. When the interlock plate 6 separates from the tip of the interlock lever 3, the interlock lever 3 rotates clockwise by the urging force of the coil spring 7, and the tip moves upward. Thereby, as shown in FIG. 1, the interlock plate 6 of the circuit breaker BRK comes into contact with the interlock lever 3, and an interlock state where the circuit breaker BRK cannot be inserted into the operating position in the cubicle is established.

Next, the circuit breaker test is completed and the circuit breaker BRK
The breaker when inserting it into the operating position in the cubicle.
The operator determines whether or not the BRK insertion condition is satisfied. If it is determined that the BRK insertion condition is satisfied, the operator operates an insertion switch (not shown) to excite the interlock coil 1, and the electromagnetic force is used. The interlock coil 1 sucks the suction plate 2a against the urging force of the coil spring SP and the coil spring 7. Then, the tip of the holding plate 20 moves down, the tip of the interlock lever 3 moves down via the spring pin 8, and the interlock lever 3 of the circuit breaker BRK separates from the interlock plate 6, and the breaker BR
K interlock is released. At the same time, the lower surface on the distal end side of the interlock lever 3 comes into contact with the switch lever 9a of the micro switch 9, and the switch lever 9a moves down to hold the micro switch 9 in a closed state. The drive circuit of the moving motor is closed by the closing operation of the microswitch 9, and the moving motor is driven to move the circuit breaker BRK into the cubicle as shown in FIG.

Since the tip of the interlock lever 3 has been moved down in this way, the interlock plate 6 does not come into contact with the interlock lever 3 and the circuit breaker BRK operates in the cubicle as indicated by a two-dot chain line. Inserted to the position. When the circuit breaker BRK is in the operating position, a limit switch (not shown) is operated to demagnetize the interlock coil 1. Then, the interlock lever 3 rotates clockwise by the urging force of the coil spring 7, the tip of the interlock lever 3 moves upward, and the upper surface of the interlock lever 3 contacts the lower surface of the interlock plate 6. become.

In this manner, it is possible to detect by the microswitch 9 that the interlock operation of the interlock device has been surely canceled, and to perform an operation for inserting the circuit breaker BRK into the cubicle only after detecting the cancellation. As a result, erroneous insertion of the circuit breaker BRK into the cubicle can be reliably prevented. Also, the interlock coil 1,
Since the interlock lever 3, the stopper 5, and the micro switch 9 are mounted on a common frame to form a unit, when replacing the interlock coil 1 or the micro switch 9 with a non-defective one, only the interlock device needs to be replaced by a frame. Can be easily removed, and required parts can be easily replaced in a short time.

In the embodiment of the present invention, the case where the circuit breaker is drawn has been described, but the same effect can be obtained even when the switch is drawn. Although the interlock operation is detected by the microswitch, a non-contact switch such as a reed switch may be used, and the present invention is not limited to the microswitch. Further, the second frame to which the interlock coil was attached was attached to the first frame to which the stopper was attached by bolts, but the second frame was attached to the first frame.
Needless to say, the same effect can be obtained even when the frame is fixed.

[0023]

As described in detail above, according to the present invention,
It is possible to reliably detect that the interlock device has performed the interlock release operation, thereby preventing the drawer-type opening / closing device from being erroneously moved, thereby increasing the reliability of the interlock function of the drawer-type opening / closing device. . In addition, the parts necessary for the interlock device are mounted on a common frame, the interlock device can be easily removed together with the frame, the parts can be easily replaced, and the trouble of performing inspection and maintenance of the interlock device is reduced. Absent. Furthermore, the present invention can provide an excellent interlock device for a drawer-type opening / closing device, for example, the interlock device can be easily assembled.
It is a great contribution to the industry.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of an interlock device of a drawer-type switching device according to the present invention.

FIG. 2 is a top view of a main part of the interlock device.

FIG. 3 is a side view showing a state of the interlock device when a coil is excited.

FIG. 4 is a side view of a main part of a conventional drawer-type circuit breaker interlock device.

FIG. 5 is a top view of a main part of the interlock device.

FIG. 6 is a side view showing a state of the interlock device when a coil is excited.

[Explanation of symbols]

1 Interlock coil, 3 interlock lever, 5 stopper, 6 interlock plate, 9 micro switch, 10A, 10B frame, 20 holding plate, BRK
Circuit breaker.

Claims (2)

[Claims] An interlock lever for preventing movement of a drawer-type opening / closing device, an interlock coil for driving the interlock lever, and a stopper engaging with the interlock lever are mounted on a common frame. ,
An interlock device for a drawer-type opening / closing device, wherein the interlock lever, the interlock coil, and the stopper are detachable together with the frame. 2. The interlock device according to claim 1, wherein a switch for detecting that the interlock lever is driven is attached to the frame.