JP2770548B2 - Remote control device for circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[Industrial applications]

The present invention relates to a device for remotely controlling a small circuit breaker such as a wiring breaker by electric power.

[Prior art]

As a remote control device for this type of circuit breaker, see
What is described in -93626 is known. This remote control device remotely controls the open / close lever of the circuit breaker via a link by means of a sliding frame that reciprocates with a nut screwed into a forward / reversely rotating screw rod. When the open / close lever is manually operated, it is manually operated. By depressing the handle, the connection between the link and the opening / closing lever is released.

[Problems to be solved by the invention]

However, such a conventional device has the following problems. (1) Since the operation motor for driving the screw rod must be rotated forward and reverse to reciprocate the sliding frame, the control circuit of the operation motor becomes complicated. (2) It is necessary to temporarily push down the handle during manual operation, which is troublesome. SUMMARY OF THE INVENTION It is an object of the present invention to provide a remote control device for a circuit breaker in which an open / close lever can be operated by one-way rotation of an operation motor. Another object of the present invention is to provide a remote control device for a circuit breaker in which manual operation is simplified. It is a further object of the present invention to provide a device which can reliably open and close a circuit breaker by absorbing dimensional errors in components and assembly.

[Means for Solving the Problems]

In order to achieve the above object, a remote control device according to the present invention includes an operation motor and two thread grooves, a right-hand screw and a left-hand screw, which are connected to the operation motor via a speed reduction mechanism and communicate with each other at a start end and an end. A threaded rod, and a pin that fits into the thread groove of the threaded rod. The one-way rotation of the threaded rod slides on the guide rod to reciprocate, and is fitted to the open / close lever of the circuit breaker. An operation arm with an operation port,
A switch for detecting the position of both ends of the reciprocating motion of the operation arm to open and close the control circuit of the operation motor, and rotating the operation motor in one direction via the control circuit to open and close the open / close lever of the circuit breaker. It shall be operated remotely. In the above device, a pin that fits into the thread groove of the screw rod is provided on a slide piece that is separate from the operating arm, and the slide piece slides on the guide rod with one-way rotation of the screw rod to reciprocate. And by combining the slide arm with an operating arm via a spring,
The mismatch between the reciprocating stroke of the operation arm and the opening / closing stroke of the opening / closing lever of the circuit breaker based on dimensional errors in components and assembly can be easily absorbed. Also, in these devices, a one-way clutch that transmits rotation in only one direction is provided in the speed reduction mechanism,
The manual operation is simplified by connecting the handwheel to the threaded bar via another one-way clutch.

[Operation]

The operating arm connected to the open / close lever of the circuit breaker is fitted to a threaded rod having two threaded grooves, a right-hand thread and a left-hand thread, which communicate with each other at the start end and the end. Can be reciprocated. In addition, in the case of a remote control device, in general, variations in the dimensions of parts and assemblies of the circuit breaker and the remote control device itself, or variations in the mounting dimensions when the remote control device is mounted on the circuit breaker, may cause the operation arm to be disturbed. A situation may occur in which the reciprocating stroke and the opening / closing stroke of the open / close lever of the circuit breaker do not match. In such a case, if the stroke of the operation arm is excessive, the opening / closing lever is damaged, and if the stroke is insufficient, the opening / closing operation cannot be achieved. Therefore, if a member straddling between the screw rod and the opening / closing lever is divided into a slide piece fitted to the screw rod and an operating arm fitted to the opening / closing lever, and these are combined via a spring, By setting the maximum operating position including the variation of the opening / closing lever to be inside the stroke of the operating arm, there is no opening / closing operation failure due to insufficient stroke, and the extra amount of movement of the operating arm is due to the deformation of the spring. Since it can escape, the opening / closing lever is not damaged. Further, a one-way clutch for transmitting rotation in only one direction is provided in a reduction mechanism for transmitting the rotation of the operation motor to the screw rod by reducing the rotation, and a manual handle is connected to the screw rod via another one-way clutch. For example, the manual handle is released from the screw rod during the electric operation, and the open / close lever can be operated by rotating the screw rod with the manual handle independently of the operation motor during the manual operation.

【Example】

1 to 4 show a first embodiment of the present invention. FIG. 1 is a plan view of a cover partially cut away, and FIG.
FIG. 3 is an enlarged sectional view taken along the line II-II of FIG. 1, and FIG.
4 is a side view of the threaded rod, FIG. 5 is a front view as viewed from the direction of arrow V, and FIG. 6 is a view along line VI-VI in FIG. It is a top view of the pin. First, in FIGS. 1 to 3, and particularly in FIG. 2, 1 is a circuit breaker (wiring breaker), 2 is an opening / closing lever thereof, and the opening / closing lever 2 is moved in the left-right direction in FIGS. 1 and 2. When operated, the circuit breaker 1 performs ON, OFF and reset operations. Reference numeral 3 denotes a remote control device in which a base 4 is fixed to the circuit breaker 1 with screws 5 (FIG. 1), and mechanical components are housed in an outer box including a case 6 and a cover 7 integrated with the base 4 as follows. It is configured. In addition, a window 6 a is opened in the bottom plate of the case 6 along the movement path of the opening / closing lever 2. Reference numeral 8 denotes an operation motor, which is attached to a side surface of a gear case 10 of a reduction mechanism 9 with a screw 11, while the reduction mechanism 9 is a bevel gear 12 directly connected to a rotation shaft 8a of the operation motor 8,
A bevel gear 15 meshed with the main shaft 13 and connected to the main shaft 13 by a pin 14, and a spur gear mounted on the main shaft 13 via a one-way clutch 16 that transmits rotational force only clockwise as viewed from the right side in FIG. 17, a two-stage spur gear 18 rotatably supported on a shaft 19 fixed to the gear case 10 by meshing the spur gear 17 and the large gear 18a, and a small gear 18 of the two-stage spur gear 18
b and a large gear 20a mesh with each other and are rotatably supported on the main shaft 13; a two-stage spur gear 20;
a two-stage spur gear 21 rotatably supported by a shaft 19 and a small gear 21b of the two-stage spur gear 21 and an output shaft 22 rotatably supported by the gear case 10. It has. One end of the main shaft 13 is connected to the gear case 10, and the other end is connected to a spur gear 23 through a bearing 24.
Each is rotatably supported. The speed reduction mechanism 9 is fixed to a frame 25 fixed to the bottom of the case 6 with screws 26. Opposing columns 27 and 28 are raised on the frame 25, and threaded rods 29 are movably supported at both ends of the columns 27 and 28. The output shaft 22, which has flat portions 22a for rotation prevention on both left and right sides, is directly connected to the right end of the screw rod 29 in FIG. In addition, post 2 is attached to screw rod 29.
A retaining ring 31 is mounted on the inside of the thrust plate 30 via the thrust plate 30, thereby fixing the screw rod 29 in the axial direction. The screw rod 29 has a small-diameter portion 29a at the left end of FIG. 2 which extends outside the column 28. The small-diameter portion 29a has a one-way clutch 16
A spur gear 33 is mounted via another one-way clutch 32 that transmits the rotational force only in the same one direction. 34 is a retaining ring for retaining the spur gear 33. The shaft 35 (1st section) is provided in the concave portion at the upper left end of the cover 7 in FIGS.
(Fig. 3, Fig. 3) Manual handle attached to cover 7
36, and a segment gear 37 meshing with the spur gear 33 is provided integrally with the manual handle 36. A tension spring 38 is provided between the segment gear 37 and the cover 7, and the manual handle 36 always receives a returning force in the clockwise direction in FIG. The threaded rod 29 is threaded as shown in FIG. That is, in FIG. 4, the screw groove 39 is composed of three pitches of two screw grooves 39R and 39L of a right screw thread groove 39R indicated by a virtual line R and a left screw screw groove 39L indicated by a virtual line L. The start and end of the two are connected to each other to form one closed loop. In such a screw groove 39,
As shown in FIGS. 5 and 6, a boat-shaped pin 40 is loosely fitted at the tip portion 40a. Now, the operation arm 41 supporting the pin 40 will be described again with reference to FIGS. 1 and 2, the operating arm 41 is a vertical sliding part.
41a (FIG. 2) and the operating section 41b crossing horizontally below the lower part
(FIG. 1), and the sliding portion 41a
Sliding on the screw rod 29 and the guide rod 42 inserted into the two large and small through holes opened through the appropriate gaps respectively,
It reciprocates right and left in the figure. The guide rod 42 is fixed to the columns 27 and 28 by screws 43 at both ends. A cylindrical recess 44 and a square hole 45 communicating with the screw groove 29 are formed at the lower end of the sliding portion 41a.The recess 40 accommodates a pin 40 that fits into the screw groove 38 through the square hole 45. ing. As shown in FIGS. 4 and 5, the pin 40 includes a boat-shaped tip portion 40a, a flange portion 40, and a round bar-shaped body portion 40c.
A screw hole is provided at an end of the body 40c. Such a pin 40 is housed in a recess 44 together with a compression screw 46 fitted in the body 40c, and a cover plate 47 having a through hole for guiding the body 40c is covered from above the center. The cover plate 47 is fastened to the end surface of the sliding portion 41a by a screw (not shown), and a set screw 48 is screwed into the screw hole on the end surface of the body portion 40c through the cover plate 47. A square hole-shaped operation port 49 is provided on the lower surface of the operation section 41b of the operation arm 41.
(FIG. 1) is formed and fitted so as to cover the opening / closing lever 2. An actuator 50 is integrally raised on the head of the sliding portion 41a, and pushes a switch 52 attached to the ceiling surface of the cover 7 with a screw 51 at both ends of the reciprocating motion of the operation arm 41. I have. In such a configuration, the operation arm 41 is
When the operation motor 8 is started clockwise in FIG. 1 in the state at the right end of the figure, its rotation is reduced to five steps by the reduction mechanism 9 and transmitted to the screw rod 29. Therefore, the operation arm 41 in which the pin 40 is fitted in the thread groove 39 of the threaded rod 29 is sent to the left-hand thread groove 39L and moves leftward. At that time, the compression screw 4
6 presses the pin 40 against the screw rod 29 with an appropriate force to prevent the pin 40 from coming out of the screw groove 39. When the operation arm 41 reaches the left end of the screw groove 39L, the actuator 50 presses the switch 52,
As a result, the operation motor 8 stops, and the operation arm 41 also stops. During that time, the opening / closing lever 2 fitted to the operation port 49 rotates together with the operation arm 41, and when the opening / closing mechanism of the circuit breaker (not shown) passes through the dead center, the circuit breaker is closed. Next, when the operation motor 8 is started in the same direction in a state where the operation arm 41 is at the left end, the operation arm 41 is sent to the right-hand thread groove 39R of the screw rod 29 and moves rightward. When it reaches, it stops by the operation of the switch 52. Meanwhile, the circuit breaker 1 is shut off. The above is a normal ON / OFF operation. However, when the circuit breaker 1 trips due to the operation of a trip device (not shown), the operation arm 41 is moved from left to right to reset the circuit breaker 1 once. , From right to left. Next, when the circuit breaker 1 is manually operated, the manual handle 36 is raised with the shaft 35 as a fulcrum. This allows
The screw rod 29 is rotated via the segment gear 37 and the spur gear 33, and the operation arm 41 reciprocates as in the case of the electric operation. At that time, since the one-way clutch 16 idles, the connection with the operating motor 8 is disconnected, and the operating force is reduced accordingly. Further, when the manual handle 36 is pressed down, the one-way clutch 32 idles, so that the opening and closing operation can be performed by a small vertical movement of the manual handle 36. As described above, according to the illustrated configuration, the open / close lever 2 can be reciprocated by rotating the operation motor 8 in one direction, so that the control circuit of the operation motor 8 is simplified as compared with the case where the operation motor 8 is rotated forward and reverse, and the control device is controlled. The kind is small. In addition, the manual handle using the one-way clutch can be operated lightly by a small up-and-down motion, and the operation is simpler than that in which the manual handle is pulled down while pushing down. Next, FIGS. 7 and 8 show a main part of a second embodiment of the present invention. FIG. 7 is an exploded perspective view of an operation arm portion.
FIG. 8A is a front view of the operation arm portion of FIG. 7, and FIG.
Is a cross-sectional view along the line BB. It is assumed that parts other than those shown are the same as those of the first embodiment, and parts corresponding to those of the first embodiment are given the same reference numerals. In these figures, reference numeral 53 denotes a slide piece which fits with the screw rod 29 via the pin 40, and has flat rectangular plates 53a above and below a prismatic body 53a whose front surface is formed in an arc shape along the side surface of the screw rod 29. A guide portion 53b extends, and an actuator 50 for operating a switch (FIG. 2) is integrally provided on the head. Torso
A through hole 54 is formed in 53a to open toward the side surface of the screw rod 29, and the pin 40 is accommodated therein. In the first embodiment, the pin 40 is fitted into the thread groove 39 from below the threaded rod 29, but in the case shown in the figure, it is fitted from the side. Also,
In this case, two guide rods 42 are provided above and below the screw rod 29,
The slide piece 53 has a through hole 55 formed in the upper and lower guides 53b.
Are guided by these guide rods. In addition,
In the first embodiment, the guide rod 42 is fastened to the columns 27 and 28 with screws 43 using female threads cut on the end surface (FIG. 2). Is male screw 42a
Are cut off and fastened to the columns 27 and 28 by nuts (not shown). On the other hand, the operation arm 41 combined with the slide piece 53 is the first
In the same manner as in the embodiment, it has an L-shape as a whole.
Is formed in a hollow box shape as shown in the drawing so as to be accommodated inside. The slide piece 53 is inserted into the operation arm 41 from diagonally upper left in FIG. 7, and is combined as shown in FIG. Reference numeral 56 denotes a through hole through which the guide rod 42 passes, and is formed in accordance with the through hole 55 of the slide piece 53. Here, the thickness A in the sliding direction (the axial direction of the guide rod 42) of the guide portion 53b of the slide piece 53 is smaller than the width B of the space of the operation arm 41 accommodating this portion (B). −A = G ₁ ), and the slide piece 53 can move in the sliding direction within the operation arm 41 to some extent. On the surface of the guide portion 53a (the surface on the near side in FIG. 7) on the side where the opening / closing lever 2 is turned off, a large number (eight in the case of FIG. 7) of relatively small bottoms surround the through hole 55. A hole 57 is drilled and this hole
A small-diameter spring 58 that receives a compressive force between the operation arm 41 and the operation arm 41 is inserted into the inside of the 57. 8B, when the slide piece 53 is located at the left end of the screw bar 29 in the drawing, as shown by the two-dot chain line, the circuit breaker 1 is in the closed state, and the slide piece 53 in the drawing of FIG. the end face of the left side (the surface on the side of the opening lever 2 oN operation) operating arm 41 abuts, the gap G ₁ is occurring on the other side. In this state, when the operation motor 8 (FIG. 2) is activated and the screw rod 29 rotates, the slide piece 53 is sent to the right in the figure, and at the same time, the operation arm 41 is also pushed via the spring 58, and the opening / closing lever 2 is moved. Go to the right while rotating to the right. Eventually, the circuit breaker 1 performs a breaking operation, and the open / close lever 2
While the operating arm 41 fitted to this reaches the solid line position in the drawing and stops, the slide piece 53 still slightly advances while compressively deforming the spring 58, and stops at the right end position of the screw rod 29 as shown. G ₂ is the remainder of the gap between the operation arm 41 and the slide piece 53 at that time. The ON operation of the circuit breaker 1 is performed by moving the slide piece 53 again to the position indicated by the two-dot chain line. In the illustrated configuration, the opening / closing lever 2 reaches the OFF position before the slide piece 53 reaches the end of the stroke S of the reciprocating motion. If the maximum operation position including the variation of the opening / closing lever 2 is set so as to be inside the stroke S of the slide piece 53, opening / closing operation failure due to insufficient stroke does not occur. Further, the extra movement of the slide piece 53 at the minimum operation position of the opening / closing lever 2 can be escaped by the compression of the spring 58, so that the opening / closing lever 2 is not damaged due to an excessive stroke. In other words, closing the gap G ₁ lever 2
Can be absorbed. In the illustrated embodiment, a spring is not provided on the side where the circuit breaker is turned on. In addition, since the opening / closing lever 2 is not damaged by the elastic action of the contact spring of the movable contact portion (not shown), the spring is not always necessary. Also, as shown in the illustrated embodiment, it is preferable to obtain a required spring force by using a large number of small springs 58, so that the space required for inserting the springs can be made compact.

【The invention's effect】

According to the present invention, since the forward / reverse rotation of the operation motor is not required, the control circuit is simplified, the space for the control device is reduced, and the device is inexpensive. In this case, by inserting a spring into the operating arm to absorb the variation in the operating position of the opening / closing lever, there is no possibility that the opening / closing operation failure or the loss of the opening / closing lever will occur, and the adjustment at the time of the assembly work will be simplified. Further, in these devices, by providing a one-way clutch, manual operation with simple operation and small operation force can be realized.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a plan view of the cover of the first embodiment, in which a cover is partially cut away, and FIG.
FIG. 3 is an enlarged sectional view taken along the line II-II, and FIG. 3 is an arrow III in FIG.
FIG. 4 is a side view of the threaded rod, FIG. 5 is a front view as seen from the direction of the arrow V, and FIG. 6 is VI of FIG.
FIG. 7 is a plan view of the pin as viewed along the line VI, FIG. 7 is a perspective view of the operation arm portion of the second embodiment of the present invention, and FIG. 8 (A) is a front view of the operation arm portion of FIG. And FIG. 8 (B) shows the BB
It is sectional drawing which follows a line. DESCRIPTION OF SYMBOLS 1 ... Circuit breaker, 2 ... Opening / closing lever, 3 ... Remote control device, 8 ... Operation motor, 9 ... Reduction mechanism, 16 ... One-way clutch, 29 ... Screw rod, 32 ... One-way Clutch, 36
…… Manual handle, 41 …… Operation arm, 42 …… Guide rod, 49…
... Operation port, 52 ... Switch, 53 ... Slide piece, 58 ...
Spring.

Claims (3)

(57) [Claims] An operating motor, a threaded rod connected to the operating motor via a speed reduction mechanism and having two thread grooves, a right-hand thread and a left-hand thread, which communicate with each other at a start end and an end, and the screw of the thread rod An operating arm having a pin that fits in the groove, slides on the guide bar with the one-way rotation of the screw bar, reciprocates, and has an operating port that fits into the open / close lever of the circuit breaker; A switch for detecting the position of both ends of the reciprocating movement of the arm and opening and closing the control circuit of the operation motor; rotating the operation motor in one direction through the control circuit to remotely control the open / close lever of the circuit breaker; A remote control device for a circuit breaker. 2. An operating motor, a screw rod connected to the operating motor via a speed reduction mechanism and having two thread grooves, a right-hand thread and a left-hand thread, which communicate with each other at a start end and an end, and the screw of the screw rod A slide piece having a pin fitted in the groove and sliding on the guide rod with the one-way rotation of the screw rod and reciprocating, and an open / close lever of the circuit breaker combined with the slide piece and a spring. An operation arm having an operation port to be fitted, and a switch for detecting both end positions of the reciprocating movement of the slide piece to open and close a control circuit of the operation motor, and the operation motor is controlled in one direction through the control circuit. A remote control device for a circuit breaker, wherein the device is rotated to remotely control an open / close lever of the circuit breaker. 3. The device according to claim 1, further comprising a one-way clutch for transmitting rotation in only one direction in the speed reduction mechanism, and manually operating the screw rod via another one-way clutch. A remote control device for a circuit breaker having a handle connected thereto.