JPS6226530B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a circuit breaker operating mechanism, and more particularly to a circuit breaker operating mechanism that closes the circuit breaker using a closing spring stored in energy by a motor.

[Conventional technology]

As a circuit breaker operating mechanism, the one shown in FIG. 1 is known.

In this conventional example, a ratchet wheel 4 is fixed near the center of a square rotating shaft 2, and a closing spring accumulator 6 and a cam 8 for operating a circuit breaker (not shown) are fixed to both ends of the ratchet wheel 4. That is, the rotating shaft 2, the ratchet wheel 4, the closing spring accumulator 6, and the cam 8 are integrally formed.

The closing spring energy storage device 6 includes a crank 10 fixed to one end of the rotating shaft 2 and a pin 12 that is parallel to the rotating shaft 2 and protrudes in a direction opposite to the rotating shaft 2.

One end of a spring holding rod 14 is rotatably supported by the pin 12. The other end of the spring retaining rod 14 is inserted into a hole in the bracket 16.
The spring holding rod 14 also has a stopper 14A, and between this stopper 14A and the bracket 16 a closing spring 18 is provided.

The rotating shaft 2 is inserted into an outer cylindrical bush 22 which is rotatably fitted into a bracket 20. One end of a lever 24 is swingably supported by the bush 22. One end of a link 28 is connected to the other end of the lever 24 by a pin 26, and the other end of the link 28 is connected to a shaft 32 of a motor 30.
It is connected by a pin 36 to a crank 34 which is eccentrically fixed to. The mechanism from motor 30 to pin 26 is a drive device that provides rocking motion to lever 24.

A pin 38 protrudes from the side surface of the lever 24, and a feed pawl 40 is rotatably supported by the pin 38. The feed pawl 40 is a torsion coil spring 44 wound around the pin 38 and one end of which is locked to the stopper 42.
Rotating force is applied by the feed pawl 40 so that the tip of the feed pawl 40 comes into contact with the teeth 4A of the ratchet wheel 4.

One end of a plate-like member 46 is rotatably supported near the bush 22 on which one end of the lever 24 is supported. A feeding claw 4 is provided on the side surface of the plate member 46.
Similarly to 0, the anti-reversal pawl 54 is supported using a pin 48, a stopper 50, and a torsion coil spring 52 so that its tip abuts against the teeth 4A of the ratchet wheel 4. The plate member 46 has a pin 50 and a bracket 52.
A spring 56 connects a fixing pin 54 fixed to
It is pulled by and comes into contact with a stopper 60 fixed to the bracket 58.

An L-shaped hook 62 is rotatably supported by a pin 64 near the closing spring accumulator 6, and its rotation is restricted by a locking pin 66 inserted into a bracket 63. Note that 70 is a limit switch connected to the motor.

Next, the operation of the operating mechanism of this circuit breaker will be explained.

When the motor 30 of the drive device is rotated, the crank 34 rotates, causing the link 28 to reciprocate in the direction of the arrow. As the link 28 reciprocates, the lever 24
makes an oscillating motion about the rotating shaft 2. The swinging movement of the lever 24 also swings the feed pawl 40, and one movement of the feed pawl 40 advances the teeth of the ratchet wheel 4 by one tooth. When the teeth of the ratchet wheel 4 are advanced by one tooth, the anti-reverse claw 5
4 meshes with the teeth of the ratchet wheel 4 to prevent the ratchet wheel from reversing. The next swing of the feed pawl 40 advances the teeth of the ratchet wheel 4 by one more tooth, and the reversal prevention pawl 54 prevents the ratchet wheel from reversing. In this way, the ratchet wheel 4
0 is rotated one tooth at a time, and the rotating shaft 2
Rotate. In accordance with the rotation of the rotating shaft 2, the closing spring accumulator 6 and the cam 8 rotate.

The closing spring energy storage device 6 rotates while storing energy in the closing spring 18, and as shown in FIG. When the limit is reached, the contact of the limit switch 70 is pressed by the side of the crank 10 to stop the motor. Then, the pin 12 of the closing spring energy accumulator 6 is connected to the hook 62.
and maintains the charged state. At this time, as shown in FIG. 3, the feed pawl 40 is located at a portion of the ratchet wheel 4 where the teeth are notched, so the ratchet wheel 4 is not rotated and there is no need to apply a brake to the motor.

Next, when the engagement between the pin 12 and the hook 62 is released by a closing device (not shown), the closing spring 18
With the stored energy, the closing spring storage device 6, the cam 8, and the rotating shaft 2 rotate together in the direction of the arrow in FIG. close. When the closing spring 18 is released, the crank 10 is separated from the limit switch 70, so the motor 30 rotates, and the closing spring 18 is charged in the same manner as described above. Note that the circuit breaker is opened by removing a tripping device that locks a cutoff spring (not shown) and using the force of the cutoff spring.

Thereafter, the same operations as described above are repeated to continue opening and closing the circuit breaker.

[Problem that the invention seeks to solve]

By the way, there are various types of circuit breakers, and their operating forces also vary. Therefore, if various operating mechanisms are manufactured to suit each required operating force, the number of types of operating mechanisms will increase considerably. On the other hand, if one operating mechanism is shared for the purpose of standardization, it will be necessary to manufacture the operating mechanism to match the circuit breaker with the maximum operating force, and it will be wasteful in terms of both cost and size for other circuit breakers. There will be more.

It is also possible to change the motor capacity of the drive device to make it compatible with circuit breakers that require various operating forces, but generally speaking, if the motor capacity is reduced, the reduction ratio of the speed reduction device must be increased. However, if the operating mechanism becomes larger and the reduction ratio is reduced, the capacity of the motor must be increased.

An object of the present invention is to provide a circuit breaker operating mechanism that can generate a large operating force by using basic parts that generate a small operating force and adding only a few parts to the basic parts.

[Means for solving problems]

In order to achieve the above object, the present invention includes a ratchet wheel fixed to a rotating shaft, a lever swingably supported by the rotating shaft, a motor and a crank fixed to the drive shaft of the motor. a drive device that provides rocking motion about the rotating shaft; a feed pawl that is supported by the lever and engages with the ratchet wheel in response to the rocking motion of the lever to rotate the ratchet wheel and the rotating shaft; A reversal prevention pawl that is supported by a plate-like member supported on the rotary shaft and meshes with the ratchet wheel to prevent the ratchet wheel and the rotating shaft from reversing, a closing spring that stores energy for closing the circuit breaker, and a closing spring that is fixed to the rotating shaft and that A closing spring energy storage device that stores energy in the closing spring through rotation, a hook that holds the closing spring in the loaded state, and a closing spring that is fixed to the rotating shaft and rotates with the rotating shaft due to the energy of the closing spring that is released from the hook. In a circuit breaker operating mechanism that basically consists of a cam that closes the circuit breaker, the feed pawls are separated from each other by the number of teeth that is the reciprocal of the number of feed pawls plus an arbitrary integer. A plurality of reversal prevention pawls are provided, each of which has a plurality of feed pawls in contact with teeth, and each tip of the reversal prevention pawl abuts on the teeth of a ratchet wheel at a distance of the number of teeth equal to the reciprocal of the number of reversal prevention pawls plus an arbitrary integer. The crank of the drive device is used as a pawl, and the swinging dimension of the lever is S S = 1/nS ₁ +C (where n is the number of feed pawls, S ₁ is the stroke of the lever when there is one feed pawl, and C This paper proposes a circuit breaker operating mechanism using a crank having a radius proportional to the margin dimension.

In particular, when the number of feed pawls and reversal prevention pawls is two each, one of the feed pawls is made to protrude in the thickness direction of the ratchet wheel, and the ratchet wheel has two pawls when the closing spring is loaded.
A member for releasing the engagement between the one of the feed pawls and the teeth of the ratchet wheel is provided on a side surface, a partially cut-out portion for releasing the meshing with the remaining feed pawl is formed on the row of teeth, and the crankshaft is cranked. By making the radius approximately half of that when there is one feed pawl, even if the spring constant and spring force of the closing spring increase depending on the capacity of the circuit breaker, it is possible to operate the circuit breaker without replacing it with a motor with a large rotating torque. In addition to being operable, the configuration eliminates the need for a separate stopping mechanism such as a brake when the closing spring energy storage is completed.

[Effect]

The factors that determine the swinging dimension of the lever are the dimension for actually advancing the lever by one claw, and the margin dimension for reliably advancing the lever. Since this allowance dimension must be kept approximately constant regardless of the number of claws, the swing dimension S is as follows.

S=1/nS ₁ +C where n is the number of pawls, S ₁ is the stroke of the lever when there is one pawl, and C is the margin dimension. This C
can be made smaller as the precision of the parts improves. Because of the allowance dimension C, the swing dimension S is not completely inversely proportional to the number n of pawls, but it decreases as the number of pawls increases, and the radius of the crank connected to the motor can be reduced. The radius of the crank decreases in proportion to S, assuming the length of the lever arm is constant.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings. An embodiment of the present invention is shown in FIGS. 4 to 6. Note that parts corresponding to those in the conventional example shown in FIG. Furthermore, in this embodiment, a case will be described in which two feed pawls and two reversal prevention pawls are used.

In this embodiment, the parts added to the operating mechanism of the conventional circuit breaker are a second feed pawl 72, a second reverse prevention pawl 74, and a second feed pawl 72 and pawl in the closing spring stored state. A guide plate 76 serves as a release member for releasing the engagement with the wheel 4.

The second feed pawl 72 has the same configuration as the feed pawl 40 supported on the side surface of the lever 24, and is supported side by side with the feed pawl 40. That is, the tip of the second feed claw 72 is connected to the pin 78 and the torsion coil spring 8.
0, it is pressed by the stopper 82 and is in contact with the teeth 4A of the ratchet wheel 4.

These feed claws 40 and second feed claws 72 are arranged so as to satisfy the following two conditions. One of the conditions is that the tips of the feed pawl 40 and the second feed pawl 72 contact the ratchet wheel at a distance of at least the number of teeth equal to the reciprocal of the number of feed pawls plus an arbitrary number of teeth. In this embodiment, as shown in FIG. 7, the tips of the feed claw 40 and the second feed claw 72 are separated by 2.5 teeth.
Other conditions are that the feed claw 40 and the second feed claw 72
This means that the tip of the closing spring is released from meshing with the teeth of the ratchet wheel 4 in the closing spring energized state.
In this embodiment, the feed claw 40 is in the closing spring energized state.
The tip of the second feed pawl 72 is located in the notched portion of the teeth of the ratchet wheel 4, and the second feed pawl 72
0, as shown in FIG. 6, it protrudes in the thickness t direction of the ratchet wheel 4, and its tip is pushed by the tip of the guide plate 76 (FIG. 8).

The second anti-reverse claw 74 is supported on the side surface of the plate member 46 using a pin 84, a torsion coil spring 86, and a stopper 88, similar to the anti-reverse claw 54 supported on the side surface of the plate member 46. ing. The tips of the anti-reverse pawl 54 and the second anti-reverse pawl 74 are spaced apart from each other by the same amount as the spacing between the tips of the feed pawl 40 and the second feed pawl 72, and come into contact with the teeth of the ratchet wheel 4.

The guide plate 76 is fixed to the side surface of the ratchet wheel 4 so that its tip is positioned in front of the toothed portion of the ratchet wheel 4 in the rotational direction (FIG. 8). Note that instead of this guide plate 76, a protrusion may be provided at a position corresponding to the tip of the guide plate.

Here, in order to reduce the swing range of the lever 24 to about 1/2, the length of the arm of the crank 34 is set to about 1/2 of the conventional arm length, for example. Further, the spring constant and spring force of the closing spring 18 are approximately twice those of the conventional spring constant and spring force.

The operation of this embodiment will be explained below. When the drive device including the motor 30, crank 34, and link 28 operates with the energy stored in the closing spring shown in FIG. Oscillating motion within the range of. One movement of this rocking movement moves the ratchet wheel 4 by about 1/2.
Teeth advance. This will be explained using FIGS. 1 to 4.

First, in the initial state, as shown in FIG. 7, the tip of the feed pawl 40 is in contact with the tooth bottom of the ratchet wheel 4, and the tip of the second feed pawl 72 is in contact with the tooth tip and tooth bottom of the pawl wheel 4. The second anti-reverse claw 74 is in contact with the middle position of the ratchet wheel 4.
The reversal prevention pawl 5 is in contact with the intermediate position between the tooth tip and the tooth bottom.
4 is in contact with the tooth bottom of the ratchet wheel 4. When the lever 24 swings, the forward movement of the lever 24 advances the feed pawl 40 and the second feed pawl 72 by 1/2 tooth, and advances the ratchet wheel 4 by 1/2 tooth to bring it into the state shown in FIG. 7, 2. . At this time, the second anti-reverse claw 74 comes into contact with the tooth bottom and the ratchet wheel 4
prevent reversal. By the backward movement of the lever 24, the feed pawl 40 and the second feed pawl 72 return to their initial positions, resulting in the state shown in FIG. 7. At this time, the ratchet wheel 4
is advanced by 1/2 tooth, so the feed claw 40 contacts the middle between the tooth tip and the tooth bottom, and the second feed claw 72 contacts the tooth bottom. With the next forward movement of the lever, the ratchet wheel 4 is further moved by 1/2.
The teeth advance and the state shown in FIG. 7 is reached. At this time, the reversal prevention pawl 54 prevents the ratchet wheel 4 from reversing. This operation is repeated and the ratchet wheel rotates 1/2 tooth at a time.

When the ratchet wheel 4 rotates and the closing spring 18 is placed in the energized state as shown in FIG. The supply of power to the motor is stopped, and the energy storage of the closing spring is completed. When the closing spring 18 is in the charged state, as shown in FIGS. 5 and 8, the feed pawl 40 is in contact with the toothed portion 4X of the ratchet wheel 4, and the second feed pawl 72 is in contact with the tip of the guide plate 76. , the feed pawl is disengaged and does not rotate the ratchet wheel 4. Therefore, there is no need to use a brake or the like to suddenly stop the rotation of the motor.

In addition, when closing the circuit breaker, it is sufficient to release the engagement between the hook 62 and the pin 12 as in the conventional case.

Conventionally, the ratchet wheel 4 was moved by one tooth per rotation of the crank 34, but in this embodiment, the ratchet wheel 4 only needs to be moved by 1/2 tooth, so the rotation radius of the crank 34 is reduced by approximately 1/2.
2, the rotational torque of the motor can be reduced to about 1/2.
Therefore, the rotation radius of the crank 34 can be reduced by about 1/2 without changing the motor capacity or the ratchet size.
Therefore, even if the spring constant and spring force of the closing spring are approximately doubled, the operation mechanism can be operated with sufficient margin. Furthermore, since the second feed pawl and the second anti-reverse pawl may be placed at the same rotation radius position as the feed pawl 40 and the second anti-reverse pawl 54, respectively, even if the pawl is added, the operation of the same size will generally be maintained. It can be built into the mechanism, making it easy to share parts.

In addition, in this embodiment, the closing spring energy storage time is approximately 2
However, while the energy storage time is on the order of several seconds, there is generally no problem in using a motor in the operating mechanism that is rated for several minutes or more.

Furthermore, in the above embodiment, the ratchet wheel is provided with a toothed portion and a guide plate, and the second feed pawl is made to protrude in the thickness direction of the ratchet wheel. This is to prevent the ratchet wheel from being rotated. Instead of this configuration, if a brake or the like is used to stop the rotation of the motor when the power to the motor is turned off, the toothed portion of the ratchet wheel and the guide plate can be omitted, and the feed pawl and second It is also possible to arrange the feed pawls at the same height from the side of the lever.

Further, although the above embodiment uses two feed pawls and two reversal prevention pawls, the present invention is not limited to this. For example, as shown in FIG. The pawl 90 is made to protrude from the second feeding pawl 72 in the thickness t direction of the ratchet wheel 4, and
A second guide plate 92 for releasing the engagement of the third feed pawl 90 is fixed to the side surface of the ratchet wheel 4, and a third reversal prevention pawl 94 is arranged in parallel to the reversal prevention pawls 54 and 74, so that the arm of the crank 34 is fixed. It is also possible to reduce the length to 1/3. In this case, the tip of the feed pawl and the tip of the reverse prevention pawl are separated by at least 1/3 plus the arbitrary number of teeth. In this case as well, it is possible to arrange the feed pawls in parallel and omit the guide plates 76, 92 and the toothed portion of the ratchet wheel. It is also conceivable to provide four or more feed pawls and reversal prevention pawls.

〔Effect of the invention〕

According to the present invention, even if the capacity of the circuit breaker to be operated changes, only a few parts are added to the configuration consisting of basic parts that generate a small operating force.
A circuit breaker operating mechanism capable of generating various larger operating forces can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional circuit breaker operating mechanism, Fig. 2 is a partial perspective view of the conventional circuit breaker operating mechanism showing the closing spring in the energized state, and Fig. 3 is the claw shown in Fig. 2 in the energized state. An explanatory diagram showing the positional relationship of the wheel, the feed pawl, and the reverse prevention pawl, FIG. 4 is a perspective view showing an embodiment of the present invention, and FIG. 5 is a perspective view showing the closing spring stored state of the embodiment shown in FIG. , Figure 6 is a side view of the area around the ratchet wheel in Figure 5, and Figure 7 is a side view of the area around the ratchet wheel in Figure 5.
1 to 4 are diagrams explaining the rotational operation of the ratchet wheel in the embodiment shown in FIG. The explanatory diagram shown in FIG. 9 is a side view showing the positional relationship of a ratchet wheel, a feed pawl, and a reversal prevention pawl in another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Rotating shaft, 4... Ratchet wheel, 6... Closing spring storage device, 8... Cam, 18... Closing spring, 24...
... Lever, 30 ... Motor, 40 ... Feed claw, 5
4...Reverse rotation prevention claw, 62...Hook, 72...Second feed claw, 74...Second reverse rotation prevention claw, 76...
...Guide board.

Claims (1)

[Scope of Claims] 1. A ratchet wheel fixed to a rotating shaft, a lever swingably supported by the rotating shaft, and a motor and a crank fixed to the drive shaft of the motor. a drive device that provides a swing motion about a shaft; a feed pawl that is supported by the lever and engages the ratchet wheel and rotates the ratchet wheel and the rotating shaft in accordance with the swinging motion of the lever; a reversal prevention pawl supported by a movably supported plate member and meshing with the ratchet wheel to prevent the ratchet wheel and the rotating shaft from reversing; a closing spring that stores energy for closing the circuit breaker; A closing spring energy storage device that is fixed and stores energy in the closing spring by rotation of a rotating shaft; a hook that holds the closing spring in the loaded state; and a closing spring that is fixed to the rotating shaft and is released from the hook. and a cam that rotates with the rotating shaft and closes the circuit breaker due to energy of a plurality of feed pawls contacting the teeth of the ratchet wheel at a distance of a number of teeth, and the tip of each of the reversal prevention pawls is spaced apart from the pawl by the number of teeth equal to the reciprocal of the number of reversal prevention pawls plus an arbitrary integer. It consists of a plurality of anti-reverse pawls that come into contact with the teeth of the wheel, and the crank of the drive device controls the swinging dimension of the lever S S = 1/nS ₁ +C (where n is the number of feed pawls and S ₁ is the feed pawl). An operating mechanism for a circuit breaker, characterized in that it is a crank having a radius proportional to the stroke of the lever when it has one pawl (C is the margin dimension). 2. In claim 1, each of the feeding pawls has its tip abutting the teeth of the ratchet wheel with a distance equal to the number of teeth equal to 1/2 plus an arbitrary integer, and one of the feeding pawls contacts the teeth of the pawl. Consisting of two feed pawls protruding in the thickness direction of the wheel, the anti-reverse pawls are in contact with the teeth of the ratchet wheel with their tips separated by the number of teeth equal to 1/2 plus an arbitrary integer. The ratchet wheel is provided with a member on a side surface that releases the engagement between the one of the feed pawls and the teeth of the ratchet wheel when the closing spring is in the loaded state, and A circuit breaker characterized in that the tooth row has a partially cut-out portion for releasing the engagement, and the crank has a radius that is approximately half that of the one feed pawl. Operation mechanism.