JPH0746724A - Take-in and-out mechanism for electric equipment - Google Patents

Abstract

PURPOSE:To make it possible to smoothly take-in and -out electric equipment by preventing scuffing between a movable bearing and a threaded rod screwed to the movable bearing. CONSTITUTION:A square nut is loosely fitted to a square hole in a central part of a movable bearing 15, and a threaded rod 10A is screwed to this square nut. Guide bars 19A and 19B are penetrated into a slide bearing inserted into the front and rear ends of the movable bearing 15, and the upper and lower ends of these guide rods 19A and 19B are fixed to lateral frames 1c and 1d of a box body 1. The movable bearing 15 is fixed to a bearing plate 16, and a groove 13 connecting the upper portion of the front end to the lower portion of the rear end is formed in this bearing plate 16. Rollers 7 are projected out at both the side faces of a vacuum circuit breaker 3 which is taken in/out by pressing the rollers 7 forward and backward at the groove 13 of the bearing plate 16 driven up and down by a motor 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for taking in and out electric equipment such as a vacuum circuit breaker incorporated in a metal closed switchgear.

[0002]

2. Description of the Related Art An example of an electric device take-out mechanism for taking electric devices in and out, such as a vacuum circuit breaker incorporated in a metal-closed switchgear, is disclosed in Japanese Utility Model Publication No. 51-6651. There is.

As shown in FIG. 8, this circuit breaker pull-out device is a rear side both sides of an automatic connection type circuit breaker 43 housed in a closed switchboard 41 through rollers 7, guides 8 and 9 so as to be freely drawn out. A roller 46 is projectingly provided on the insertion lever 59, which has a female screw hole 58 and a guide groove 57 formed on both inner sides of the box body of the closed switchboard 41, and is screwed into the female screw hole 58 of the insertion lever 59. The screw rod 55 is provided, and the screw rod 55 is driven by the drive motor 50 to reduce the speed.
The insertion lever 59 is moved up and down by driving through the 51, and the disconnection portion 44 protruding from the rear part of the automatic connection type circuit breaker 43 is inserted through the roller 46 loosely fitted in the guide groove 57 of the insertion lever 59. , Connected to the disconnection section 42 that is provided through the rear wall of the closed switchboard 41,
It is about disconnecting.

To this end, a drive motor 50 is connected to a speed reducer 51 on one side of the bottom of the closed switchboard 41.
A transmission shaft is connected to the output shaft of, and a bevel gear 52 is fixed to the rear end of the transmission shaft. This bevel gear 52 meshes with a bevel gear 53 fixed to the lower end of a screw rod 55,
The upper part of is supported by a bearing 56, a sprocket 54 is inserted into the upper end of the screw rod 55, and a chain (not shown) is wound around the sprocket 54. The other side of the chain is orthogonal to the plane of FIG. It is wound around a sprocket at the upper end of a screw rod (not shown) provided in the direction.

At the rear of the automatic connection type circuit breaker 43, a disconnector 44
Is provided so as to project vertically, and a fixed-side disconnecting portion 42, which is opposed to the disconnecting portion 44 with a predetermined gap, is fixed to the rear portion of the closed switchboard 41.

In the circuit breaker withdrawing device thus constructed, the drive motor 10 is driven to rotate the bevel gear 52 via the speed reducer 51, and the bevel gear 53 meshed with the bevel gear 52.
When the screw rod 55 is driven by rotating, the insertion lever 59 is driven up and down. When the insertion lever 59 is driven upward, the roller 46 loosely fits in the guide groove 57 formed in the insertion lever 59, and is driven rearward according to the guide groove 57,
The disconnection section 44 of the automatic connection type circuit breaker 43 is connected to the disconnection section 42 behind it.

[0007]

However, in the circuit breaker drawer thus constructed, a large horizontal insertion force is generated in the insertion lever 59 when the disconnecting portion 44 is engaged with the disconnecting portion 42. The groove 57 thus formed acts as a force in the rotational direction on the insertion lever 57, and galling occurs between the screw and the screw rod 55 because it is formed on the insertion lever 57, and the screw rod 55
Friction due to the rotation of the motor may increase, and the drive motor 50 may be burned. Further, since it is necessary to make the threaded rod 55 strong enough to withstand the horizontal electromagnetic force generated when a large current corresponding to the overcurrent strength of the main circuit of the closed switchboard 41 is passed,
The diameter is increased, the plate thickness of the insertion lever 57 is increased, and the drawing device is enlarged. Therefore, an object of the present invention is to obtain an electric device take-in / out mechanism that allows the electric device to be smoothly taken in and out without increasing the outer shape.

[0008]

According to a first aspect of the present invention, there is provided a guide portion projecting from a side surface of an electric device housed in a box body so as to be freely drawn out, and a guide portion provided in the box body and fitted loosely. Is a mechanism for loading and unloading an electric device, which includes a moving bearing having an inclined fitting portion formed therein, a screw rod and a guide rod penetrating the moving bearing in parallel with each other, and a driving unit for driving the screw rod.

According to the second aspect of the present invention, a guide portion projecting from a side surface of an electric device housed in the box body so as to be freely drawn out, and an inclined fitting portion provided in the box body and into which the guide portion is loosely fitted. With a nut inserted into it, a screw rod screwed into the nut of this moving bearing, a guide rod penetrating the moving bearing in parallel with this screw rod, and a drive that drives the screw rod. It is a mechanism for taking in and out electric equipment, which is composed of parts.

[0010]

The reaction force generated by the inclined fitting portion formed on the moving bearing that moves up and down in accordance with the screw rod driven by the drive unit to guide the guide portion is supported by the guide rod.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electric device take-out mechanism according to the present invention will be described below with reference to the drawings. FIG. 1 is a right side view showing a mechanism for taking in and out electric equipment according to the present invention, and FIG. 2 is A- in FIG.
A sectional reduced view, FIG. 3 is a BB sectional enlarged view of FIG. 2, and FIG. 4 is a CC sectional view of FIG. However, the upper part of FIG.
The figure which looked at the right side by extending the BB line of above is shown, and the vacuum circuit breaker 3 shown by a two-dot chain line shows a disconnection position.

1 to 4, handles 1e are attached to the left and right of the front surface of the box body 1 in which the vacuum circuit breaker 3 is housed so that it can be freely taken out and put in, as will be described in detail. In addition, a longitudinal bone 1a is provided in front of an intermediate portion of the left and right ends of the box body 1, and a longitudinal bone 1b, which is the same product as the longitudinal bone 1a, is provided behind the longitudinal bone 1a in parallel with the longitudinal bone 1a. Moreover, they are provided at symmetrical positions.

A transverse bone 1c is provided between the upper portions of the longitudinal bones 1a and 1b, and a transverse bone 1d of the same product as the transverse bone 1c is parallel to the transverse bone 1c also between the lower portions of the longitudinal bones 1a and 1b. Moreover, they are provided at symmetrical positions. Between the central portions of the upper and lower transverse bones 1c and 1d, female rods 10A and 10b are provided so as to penetrate through the screw rods 10A and 10d.
Before and after B, guide rods 19a and 19B are provided in parallel and symmetrical positions with the screw rods 10A and 10B. These threaded rods 10
The upper and lower ends of A and 10B are supported by the transverse bones 1c and 1d via bearings 11 that support the thrust direction and the radial direction.

Of these, the sprocket 8 is provided at the center of the small diameter portion at the upper end of the screw rod 10A located on the left side in FIG.
A is inserted and the screw rod 10B is located on the right side in FIG.
The sprocket 8B, which is the same product as the sprocket 8A, is inserted into the upper end of the small diameter part of the screw rod 10A, 10B.
It is fixed via a key (not shown). A chain 22 is wound around these sprockets 8A and 8B.

A bevel gear 9A is attached to the upper end of the left-hand threaded rod 10A.
Is attached and fixed to the upper end of the screw rod 10A via a key (not shown). On the other hand, a bevel gear 9B, which is the same product as the bevel gear 9A, is also attached to the lower end of the screw rod 10B protruding below the bearing 11 in which the lower end of the right screw rod 10B is supported.

Of these, the bevel gear 9A inserted into the upper end of the screw rod 10A has an electric motor 20 fixed to the ceiling of the box 1.
The bevel gear 9C inserted into the output shaft of the gear meshes with it. Similarly, for the bevel gear 9B inserted at the lower end of the screw rod 10B,
It meshes with a bevel gear 9D provided in the front-rear direction at the intermediate rear portion of the right end of the box body 1.

A gear shaft 12 extends through the bevel gear 9D, and the front end and the rear end of the gear shaft 12 are supported by bearings 23 provided on the inner surface of the lower right portion of the box body 1. A regular hexagonal end 12a is formed at the front end of the gear shaft 12.

A little below the middle of the screw rods 10A and 10B,
A substantially prismatic moving bearing 15 whose details are shown in FIGS. 3 and 4 is loosely fitted in advance. A rectangular parallelepiped nut hole 14 is formed in the center of the moving bearing 15, and the nut hole 14 has
The square nut 17 is loosely fitted, and the screw rods 10A and 10B are formed in the central portion of the square nut 17 and are screwed into the screw holes. Sliding bearings 18 are vertically inserted into the moving bearings 15 at symmetrical positions, and the sliding bearings 18 have guide rods 19 described above.
A and 19B penetrate.

On the inner surface side of the moving bearing 15 in FIG. 2, a substantially square bearing plate 16 in FIG. 3 is fixed by bolts 15a. The bearing plate 16 has a substantially V-shaped guide groove 13 formed from the upper left end to the inner right lower end in FIG. At the position of the upper left end of this bearing plate 16 in FIG. 3, the rear end surface of the roller 7 loosely fitted to a shaft (not shown) provided at the center of the left and right side surfaces of the vacuum circuit breaker 3 in the disconnected state is shown in FIGS. As shown in FIG.

On the upper surface of the bottom plate 1f of the box body 1, strip-shaped guide rails 24 are fixed in parallel to the left and right, and the left and right wheels 5 of the vacuum circuit breaker 3 housed in the box body 1 are accommodated. Are guided on the outer surface of the guide rail 24. A guide frame 6 formed in a substantially Z shape is fixed to the upper surface of the bottom plate 1f at a position outside the left and right wheels 5, and between the lower surface of the upper end portion of the guide frame 6 and the upper end surface of the wheel 5. There is a slight gap formed in.

At the rear end of the box body 1, a fixed side disconnecting section 2 is vertically provided, and at the rear part of the vacuum circuit breaker 3, a movable side disconnecting section 4 is provided.
And the movable disconnecting section 4 are opposed to the fixed disconnecting section 2 at a predetermined disconnecting distance.

Next, the operation of the pull-out mechanism of the electric device constructed as described above will be described with reference to FIG. 5 showing the connection position of the vacuum circuit breaker. When the electric motor 20 is driven counterclockwise in FIG. 2, the bevel gear 9A rotates to the right in the plan view (not shown in FIGS. 1 and 2) via the bevel gear 9C, and the screw rod
10A also rotates to the right. Then, the sprocket 8A,
Right side threaded rod with chain 22 and sprocket 8B
10B is also driven to the right.

As the screw rods 10A and 10B are driven, the square nut 17 screwed into the screw rods 10A and 10B moves upward, and the movement of the square nut 17 causes the moving bearing 15 and the moving bearing 15 to move. The fixed bearing plate 16 is driven upward.

Then, the lower surface of the roller 7 shown in FIGS. 1 and 3 abuts on the lower surface of the upper end of the guide groove 13 formed in the bearing plate 16, and the guide groove 13 of the bearing plate 16 is further raised by the rotation of the electric motor 20. It is pressed rightward in FIGS. By pressing the bearing plate 16 in the right direction by the guide groove 13, the vacuum circuit breaker 3 is driven in the right direction, and when the roller 7 moves to the position of the lower right side X of the guide groove 13 in FIG.
The movable side disconnecting section 4 of the vacuum circuit breaker 3 is fitted to the central conductor protruding from the axial center of the fixed side disconnecting section 2 penetrating the rear end of the box body 1, and the vacuum circuit breaker 3 is The connection position is shown in FIG.
When the bearing plate 16 is slightly raised by the rotating electric motor 20, the roller 7 is moved to the Y position shown at the right end of the guide groove 13 as shown in FIG. 3, and the electric motor 20 is stopped by the limit switch (not shown).

When the vacuum circuit breaker 3 is driven from the disconnection position to the connection position, the force pressing the roller 7 by the guide groove 13 causes the upper part of the vacuum circuit breaker 3 to move backward with respect to the vacuum circuit breaker 3. However, since the upper end of the wheel 5 of the vacuum circuit breaker 3 rolls on the lower surface of the upper end of the guide frame 6, the disconnection portion is connected in a horizontal state.

The rotating force applied to the square nut 17 by the rotation of the screw rods 10A, 10B is supported by the guide rods 19A, 19B penetrating the slide bearing 18 of the moving bearing 15. Similarly, the bearing plate applied to the moving bearing 15 via the bearing plate 16 by the reaction force generated by the pressing of the guide groove 13 against the roller 7.
The moment applied to the vertical plane parallel to the plane of 16 is also supported by the guide rods 19A and 19B penetrating the slide bearing 18. When pulling out the vacuum circuit breaker 3 in the disconnection state of FIG. 5 to the disconnection position shown in FIG.
Drive clockwise.

Next, the operation when the vacuum circuit breaker 3 is put in and taken out by manually operating the pull-out mechanism of the electric device constructed as described above will be described. At this time, with the female portion at the rear end of the handle not shown in the drawing fitted to the end portion 12a of the gear shaft 12 shown in FIGS. 1 and 2, the grip portion at the front end of the handle is rotated about the end portion 12a. Turn clockwise or counterclockwise.

Then, by the bevel gear 9D inserted in the rear portion of the gear shaft 12, the bevel gear 9 meshed with the bevel gear 9D.
The threaded rod 10B on the right side is driven via B. This screw rod
With the rotation of 10B, the left screw rod 10A is driven through the sprocket 8B, the chain 22, and the sprocket 8A inserted into the upper end of the screw rod 10B, and the following operation is the same as when the electric motor 20 is driven. The vacuum circuit breaker 3 is driven.

Therefore, in the electric device take-out mechanism constructed as described above, the reaction force when the vacuum circuit breaker 3 is taken in and out by pressing the roller 7 by the upper and lower surfaces of the guide groove 13 is slid by the sliding bearing 15. Guide bar 19 inserted in bearing 18
Since it is supported by A and 19B, galling between the screw rod 10A and the square nut 17 can be prevented. Therefore, even when the insertion resistance of the movable side disconnecting portion 4 is fitted to the center conductor of the fixed side disconnecting portion 2 rapidly increases in the initial stage, the screw rods 10A and 10B passing through the square nut 17 can smoothly rotate. Therefore, it is possible to suppress a sudden load increase of the electric motor 20 at the initial stage of connection.

Next, FIG. 6 is a partial detailed view showing another embodiment of an electric device take-out mechanism of the present invention, which corresponds to FIG. 4, and FIG. 7 is a front view of FIG. It is a figure corresponding to.

6 and 7, the bearing plate 16A has substantially the same outer shape as that of the bearing plate 16 shown in FIG. 4, but the stepped pin 30a is interposed between the bearing plate 16A and the upper and lower left sides of the bearing plate 16A. Grooved roller 30 is attached. Therefore, the left side of the moving bearing 15A is removed from the moving bearing 15A shown in FIG. 4, and the width is narrowed.

Therefore, on the left and right side surfaces of the vacuum circuit breaker,
The guide rod 19A shown in FIGS. 1, 2 and 3 is also deleted, and instead, as shown in FIG. 6, a guide rail 31 having an arcuate chamfered side facing the grooved roller 30 is provided upright. .

In this case, the reaction force of the drive force of the vacuum circuit breaker applied to the screw rod 10A is converted into the guide rod 19B.
And the moving bearing 15A, and the sliding bearing 18 can be supported by the contact portion between the grooved roller 30 and the guide rail 31 located at the other two vertices of the equilateral triangle in FIG. Not only that, but by using the friction between the grooved roller 30 and the guide rail 31 as rolling friction,
The vertical movement of the moving bearing 15A fixed to the bearing plate 16A can be further smoothed.

In the above embodiment, the electric equipment which is stored in and taken out of the box body 1 is described as a vacuum circuit breaker, but the electric circuit is not limited to a vacuum circuit breaker, and may be, for example, an instrument transformer or a lightning arrester. The same can be applied to main circuit devices such as.

[0035]

As described above, according to the invention of claim 1,
A guide part protruding from the side surface of the electric device housed in the box so as to be freely drawn, a moving bearing provided in the box body with an inclined fitting part into which the guide part is loosely fitted, and a moving bearing By forming a mechanism for taking in and out electric equipment by a screw rod and a guide rod penetrating in parallel and a drive unit for driving the screw rod, a moving bearing that moves up and down according to the screw rod driven by the drive unit is formed. The reaction force generated by the inclined fitting portion guiding the guide portion is supported by the guide rod, so that an electric device take-in / out mechanism capable of smoothly taking in and taking out electric device without increasing the outer shape is obtained. You can

According to the second aspect of the present invention, the guide portion projecting from the side surface of the electric device housed in the box body so as to be freely drawn out, and the slant in which the guide portion provided in the box body is loosely fitted. A moving bearing having a fitting portion formed therein and a nut inserted therein, a screw rod screwed into the nut of the moving bearing, a guide rod penetrating the moving bearing parallel to the screw rod, and a screw rod. By configuring the mechanism for taking in and out of electrical equipment with the driving unit that drives,
The reaction force generated by the inclined fitting portion formed on the moving bearing that moves up and down according to the screw rod driven by the drive unit is guided by the guide portion is supported by the guide rod. It is possible to obtain a mechanism for taking in and out an electric device that allows the device to be smoothly taken in and out.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of an electric device take-out mechanism of the present invention.

2 is a cross-sectional view taken along the line AA of FIG.

3 is an enlarged cross-sectional view taken along line BB of FIG.

FIG. 4 is a sectional view taken along line CC of FIG.

FIG. 5 is a side view showing the action of the mechanism for taking in and out the electric device according to the present invention.

FIG. 6 is a partial plan view showing another embodiment of the mechanism for taking in and out the electric device according to the present invention.

FIG. 7 is a front view of FIG.

FIG. 8 is a right side view showing an example of a conventional mechanism for taking in and out an electric device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Box body, 2 ... Fixed side disconnection part, 3 ... Vacuum circuit breaker, 4 ... Movable side disconnection part, 5 ... Wheel, 6 ... Guide frame, 7 ... Roller, 8
A, 8B ... Sprocket, 9A, 9B, 9C, 9D ... Bevel gear, 10A, 10B ... Screw rod, 11 ... Bearing, 12 ... Gear shaft, 13
… Grooves, 14… Nut holes, 15… Moving bearings, 16… Bearing plates, 17…
Square nut, 18 ... Plain bearing, 19A, 19B ... Guide rod, 20 ...
Electric motor.

Claims (2)

[Claims] 1. A moving bearing having a guide portion projecting from a side surface of an electric device housed retractably in a box body and an inclined fitting portion provided in the box body and into which the guide portion is loosely fitted. A mechanism for taking in and out electric equipment, which comprises: a threaded rod and a guide rod that extend through the moving bearing in parallel with each other; and a drive unit that drives the threaded rod. 2. A guide part projecting from a side surface of an electric device housed in the box so as to be freely drawn out, and an inclined fitting part provided in the box body in which the guide part is loosely fitted and a nut is inserted. The mounted moving bearing, the screw rod screwed into the nut of the moving bearing, the guide rod penetrating the moving bearing in parallel with the screw rod, and the drive unit for driving the screw rod. A mechanism for loading and unloading electrical equipment.