JPH0158809B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a winding (storage) portion of an electric spring operating mechanism for a circuit or disconnector.

1 to 8 show a conventional electric spring operating mechanism, and the structure and operation thereof will first be explained based on these drawings. That is, the main shaft 2 is supported by a bearing 1a attached to the mechanism frame 1 and a bearing 32a attached to the mechanism frame 32,
Further, due to the action of the backstop one-way clutch (one-way rotating clutch) 1b of the main shaft 2, rotation in only one direction is permitted. A ratchet wheel 33, an input cam 3, and a crank arm 24 are attached to the main shaft 2 so as to rotate together. Accumulating arms 35 and 36 that freely rotate concentrically are loosely connected to the ratchet wheel 33, and rollers 38 that come into contact with an accumulating cam 44 attached to a motor shaft 45 are attached to the accumulating arms 35 and 36. It is mounted with a roller mounting pin 37, and the claw 34 is connected with a claw mounting pin 39, and the claw 34 is always in contact with the ratchet wheel 33 by a torsion spring 41 provided on a spring shaft 40. Being pushed. On the other hand, the spring shaft 40 has a power storage arm 3 as shown in FIG.
A tension spring 42 is connected thereto to rotate 5, 36 in the direction of arrow K, and the other end of this spring 42 is connected to a spring attachment pin 43 attached to the frame 1. The roller 4 is connected to the roller shaft 5 on the input cam 3.
The roller 4 comes into contact with the closing latch 6 after the energy storage is completed. The closing latch 6 is rotatably supported by a latch shaft 7, and biased in one direction by a tension spring 9 connected to a spring mounting pin 10 attached to the frame 1 side.
It maintains its position by coming into contact with the stopper pin 8. The operating lever 15 has arms branching in three directions, and is rotatably supported at the center by a shaft 20. One arm abuts the input cam 3, and this operating lever 15 is shown in FIG. A roller 18 for rotation in the direction of arrow C is mounted with a roller shaft 19, and on the other arm is a roller 1 which engages with a trip latch 11 for holding the rotation position.
6 is attached with a roller shaft 17. Furthermore, an operating rod 23 is connected to one arm with a connecting pin 22. Although not shown, the operating rod 23 is connected to a contact point for opening and closing an electric circuit. The tripping latch 11 is rotatably mounted on a latch shaft 12, and the tension spring 1 mounted on a spring mounting pin 14
3 so as to come into contact with the roller 16. 46 is a tripping spring for the operating lever 15, one end of which is attached to a spring mounting pin 47.
, and the other end is the spring mounting pin 48 of the operating lever 15.
The control lever 15 is attached to the shaft 20 and urged to rotate in the direction opposite to the direction of the arrow C shown in FIG. 1, that is, in the direction of the arrow F shown in FIG. 21 holds the final position. Note that the tripping spring 46 and the stopper pin 21 are generally attached to a different position than shown in the drawings, and are held in the final position, that is, the tripping completion position, in combination with a damper device or the like.

The crank arm 24 shown in FIGS. 4 to 6 has a closing spring 28, a spring mounting bracket 26, and a crank pin 2.
5, and the other end of the closing spring 28 is connected to the main body frame 31 via a spring fitting 27, a pin 29, and a bearing stand 30.

The conventional mechanism has the above-mentioned structure, and the closing spring 28 starts to accumulate energy from the state shown in FIGS. 2 and 3. At this time, the states of the other components remain as shown in FIGS. 5 and 8. First, a command is input to the electric motor, and the energy storage cam 44 attached to the motor shaft 45 rotates. This energy storage cam 44
is an eccentric cam, and the energy storage arms 35, 36
swings at an angle of θ ₁ shown in Fig. 7, and the energy storage arm 3
The ratchet wheel 33 is rotated in the direction of arrow B shown in FIG. 8 by the pawls 34 attached to 5 and 36. Therefore, as shown in FIG. 5, the crank arm 24 also rotates in the direction of arrow B, stretching the closing spring 28 and storing spring force. and crank pin 25
When it passes the top dead center, the crank arm 24, main shaft 2, closing cam 3, and ratchet wheel 33 work together and start overrunning, and the roller 4 provided on the closing cam 3 hits the closing latch 6. Stop when touching. This overrun operation activates a limit switch (not shown) to issue a stop command to the motor. However, although the motor continues to rotate due to inertia and stops thereafter, the ratchet wheel 33 does not rotate due to the movement due to the inertia of the motor because the toothed portion is not machined on the ratchet wheel 33 after the above-mentioned overrun. This state is shown in Figs. 1, 4, and 7.
This is the so-called state of energy storage completion.

Next, when the closing latch 6 shown in FIG. 1 is operated in the direction of arrow A using, for example, an electromagnet, the closing cam 3 is rotated in the direction of arrow B by the force of the closing spring.
At this time, the input cam 3 and the roller 18 attached to the operating lever 15 come into contact with each other, and the operating lever 15 is moved by the arrow C.
and move the operating rod 23 in the direction of arrow D to close the electrical contact (not shown). At this time, the tripping latch 11 and the roller 16 engage and maintain this state, and the tripping spring 46 is extended to accumulate the tripping force. Then the second
When the trip latch 11 is actuated in the direction of arrow E as shown in the figure, the state shown in FIG. 3 is achieved by the force of the trip spring 46. In other words, this is a disconnection state, and the above operation will be repeated from now on.

Now, after the energy storage is completed (Fig. 4), if the energy is released (injected), the moving body (main shaft 2, ratchet 3,
3. Due to the inertia of the input cam 31, etc.), the position of the crank pin 25 passes the bottom dead center and further rotates in the direction of arrow B. At this time, the closing spring 28 is once compressed and then expanded again as it passes the bottom dead center, and when this spring force and the inertial force of the moving body are balanced, it is moved in the opposite direction, that is, in the direction of arrow J. Attempt to rotate the moving body. However, at this time, the one-way clutch 1b for the backstop attached to the frame 1 shown in FIG. 6 and the main shaft 2 mesh with each other, and the one-way clutch 1b rotates slightly in the direction of arrow J by the meshing backlash of the one-way clutch _1b. Stop at the angle of . In addition, the one-way clutch 1b mentioned above
As is well known, the rotation in one direction is equivalent to the frictional resistance of the bearing, and in the opposite direction, the rotation is locked with a slight backlash.

If we look at the position of θ ₃ above microscopically, it is not always constant, but changes depending on the frequency of use, increase or decrease in frictional resistance due to changes in the environment, etc. Therefore, when the pawl 34 stops at the loading completion position shown in FIG.
The tip of the wheel 33 collides with the tooth tip of the ratchet wheel 33, especially when the arrow J
The impact force upon rotation in this direction was large, and there was a drawback that part of the pawl 34 and ratchet wheel 33 were damaged.

The present invention has been made in order to eliminate such a drawback, and utilizes the overrun of the ratchet wheel 33 just before the completion of energy storage to disengage the ratchet wheel 33 and the pawl 34, and then to disengage the ratchet wheel 33 and the pawl 34 again after the energy release is completed. The purpose of this is to engage the ratchet wheel 33 and pawl 34 when starting to store energy, thereby eliminating impactful interference between the pawl and the ratchet wheel.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 9 is an enlarged view of one embodiment of the present invention, showing the discharged state and the state in which the energy accumulating arms 35, 36 are at their end positions rotated clockwise. 33 is a ratchet wheel, which differs from conventional ones in that it has a protrusion 33a. Reference numeral 34 denotes a pawl, which is rotatable around a pawl attachment pin 39, has an engaging protrusion 34a that engages with the hook portions of the foot levers 51 and 52, and has an abutment that abuts the set levers 54 and 55. It has a contact portion 34b.
The set levers 54 and 55 are opposite two of the same shape.
It is composed of two lever members, which can be rotated around the claw mounting pin 39, and the L
A roller 57 is attached to one end of the mold by a roller shaft 56, and an oval hole is provided at the other end to restrict and move the floating pin 61. Further, the lever levers 51 and 52 are composed of two L-shaped levers of the same shape, and rotate around a lever shaft 60. Note that one end thereof has a hook for holding the pawl 34 in a predetermined position, and the other end is provided with an oval hole for regulating and moving the floating pin 61. Reference numeral 53 is a reset lever that rotates around a lever shaft 60 and locks a floating pin 61.
It has a cam-shaped groove that engages if it is at the top and does not engage if it is at the bottom, and has an abutment part that comes into contact with the reset pin 50 on the right side. 42 is a return spring for the energy storage levers 35 and 36, 41 is a spring for engaging the pawl with the ratchet wheel, 62 is the lever lever 51,
52 and set levers 54 and 55 in the clockwise direction. The spring attachment pin 43 and reset pin 50 are attached to the frame 1, and the claw attachment pin 39, the spring attachment pin 40, the lever shaft 60,
The stopper pins 63 are connected to the storage levers 35 and 3, respectively.
It is attached to 6. Note that the floating pin 61 has a length such that it is held between the energy storage levers 35 and 36, and does not come out. FIG. 10 is a diagram showing the position where the energy storage lever has been rotated by the maximum swing angle θ ₁ during energy storage. FIG. 11 shows the return process of the accumulating lever, and is a diagram at the moment when the reset lever and the reset pin come into contact with each other. When the accumulating lever further swings to the final position, the state shown in FIG. 9 is reached. 12th
The figure shows a cross section taken along the - line in FIG. FIG. 13 shows the energy storage completion state, and FIG. 14 shows the energy release state. The present invention has the above structure, and its operation will be explained next.

The reserve is from Figure 9 to Figure 10, and from Figure 10 to Figure 9.
This is done by rotating the ratchet wheel 33 counterclockwise by swinging the power storage arms 35 and 36. When the energy accumulating arms 35 and 36 are rotated back, that is, rotated clockwise, the reset lever 53 comes into contact with the reset pin 50 and is rotated clockwise, as shown in FIG. is also rotated clockwise via the floating pin 61 to
It will be in the state shown in the figure. Next, the energy storage arm rotates,
That is, when rotating counterclockwise, the contact between the reset lever 53 and the reset pin 50 is released, and the force of the spring 62 causes the levers 51 and 52 to rotate counterclockwise. At this time, the tip of the hook is connected to the head surface 34 of the engaging portion of the claw 34 with the hook lever.
However, even if the tip of the pawl 34 moves up and down the tooth surface of the ratchet wheel 33, it does not engage with the hook portions of the hook levers 51, 52.
The above steps are repeated to accumulate energy, and when the accumulation of energy is completed, the state shown in FIG. 13 is reached. At this time, the ratchet wheel 33
As explained in the conventional diagram, the position is the position where the crank pin connecting the closing spring has passed the top dead center, overrun, and stopped at a rotation angle of θ from the top dead center, and the storage arm The position is just an example, and it is not known where it actually is within the swing angle θ ₁ of the energy storage arm. In any case, at this time
The protruding portion 33a of the ratchet wheel pushes against the roller 57 attached to the set levers 54, 55, and rotates the set levers 54, 55 clockwise by a predetermined amount.
When the set lever rotates clockwise, the abutting portion 34 of the pawl 34 and the left end surfaces of the arms having rollers of the set levers 54 and 55 come into contact, causing the pawl 34 to rotate clockwise. The size of this rotation is
4 is removed from the teeth of the ratchet wheel 33 and rotated to a position where it can engage with the levers 51 and 52. On the other hand, the oval holes of the set levers 54 and 55 lower the floating pin 61 downward. Then, regardless of the position of the energy storage arm, the floating pin 61 comes to the position of the large groove of the reset lever 53, so the foot levers 51, 52 rotate counterclockwise, and the hook portions are engaged with the claws 34. It engages with the portion 34a. The state is shown in FIG. 13.

Then, it enters the release state and the set levers 54,5
FIG. 14 shows a state in which the roller 57 attached to the roller 57 and the protrusion 33a of the ratchet wheel 33 are removed, and at this time the pawl 34 is engaged with the levers 51 and 52 and does not come into contact with the ratchet wheel 33. . This figure shows an example in which the energy storage arms 35, 36 do not move from FIG. 13 to FIG. 14 when the energy is released, but the above operation can be performed regardless of the position of the energy storage arms 35, 36. Therefore, after release, the claw 34 and the set lever 5
4, 55, reset lever 53, foot lever 5
The positions 1 and 52 have the state shown in FIG. 13 and the state shown in FIG. 14.

After the release is completed, the power is stored, and the power is stored in the storage arm 3.
5, 36 are initially in the position shown in FIG. 13, then they are in the state shown in FIG. 14, and then in the state shown in FIG. Rotate the ratchet wheel 33 as shown below. If the state shown in FIG. 14 is changed, the state will be as shown in FIG. 10. That is, according to the present invention, the pawl 34 and the ratchet wheel 33 do not come into contact at all during release, eliminating damage caused by collision between the pawl 34 and the ratchet wheel 33, and in addition, the pawl and the ratchet wheel 33 can be used economically. It can be manufactured.

[Brief explanation of drawings]

Figures 1 to 8 are explanatory diagrams showing the structure and operation of a conventional general electric spring operating mechanism, and Figures 9 to 14.
The figure is an explanatory diagram showing the structure and operation of an embodiment of the present invention. In the figure, 33 is a ratchet wheel, 33a is a projection, 34 is a pawl, 35 and 36 are accumulating arms, 51 and 52 are foot levers, 53 is a reset lever, and 54 and 55 are set levers. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A ratchet wheel having a protrusion on a part of its periphery, rotatably attached to the accumulating arm via a pawl attachment pin, biased counterclockwise by a spring, and forming an engaging protrusion and an abutting part. A set lever consisting of an L-shaped opposing lever member rotatably supported by a claw and the above-mentioned claw mounting pin, with a roller at one end and an oval hole at the other end, and a set lever that is rotatably connected to a power storage arm via a lever shaft. It consists of L-shaped opposing lever members attached, a hook corresponding to the engaging protrusion of the pawl at one end, and an oval hole at the other end, and a cam-shaped groove rotatably supported by the lever shaft. and a reset lever forming an abutment portion facing the reset pin, a floating pin passing through an oval hole in the set lever/foot lever and a cam-shaped groove in the reset lever, and a spring for rotating the foot lever and the set lever in a clockwise direction. An electric spring operating mechanism for circuit breakers characterized by the following.