JPS6253890B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an interlock device for a closing spring in a spring operating device for a sheath cutter.

In the case where the cutting action and the closing operation of the cutting breaker are performed by the spring of the cutting spring and the closing spring, respectively, the charging spring is not charged when the cutting breaker is closed. If the force energy is released, the unloaded loading cam will rotate at an extremely high speed, which will apply an excessive impact force to the closing spring's energy storage mechanism, significantly shortening the product life, and even damaging the feed pawl and It may destroy the stop pawl.

Therefore, with reference to FIG. 1, a conventional spring operating device will be explained, and the above-mentioned problems will be explained.

In the figure, 1 is a locking portion for attaching both ends of a break spring 4, and is pivotally connected to a closing latch 6 via a pin 2, and to a mounting plate 3 via a pin 2a. The blade spring 4 applies a counterclockwise rotational force to the closing latch 6. A closing hook 8 is engaged with the closing latch 6, and this closing hook 8 is brought into contact with the plunger 11 of the closing electromagnet 10.
A clockwise rotational force is applied by the return spring 8b. The closing latch 6 has an operating shaft 7 at its center.
The input cam 5, the feed gear 50, the stop gear 52, the swing plate 54, and the cam 55 are fixed to the operating shaft 7. The input cam 5 comes into contact with a roller 12a rotatably provided at the shaft joint of the output links 12 and 14, and the input cam 5 contacts the shaft 1 at one end of the output link 12.
3 is fixedly supported by the mounting plate 3. roller 12
a is configured to be able to come into contact with the stopper 34.
The output link 14 is connected to a connecting rod 18 via an output link 15 and a lever link 16. The shaft 17 of the lever link 16 is fixed to the mounting plate 3. Connection rod 18 is operating arm 1
The operating arm 19 has its shaft 20 fixed to the mounting plate 3 and is connected to an operating rod 21 at the other end. The operating rod 21 is the twin arm 2
2, and the connecting arm 22 is connected to the lower end of an insulating rod 25 that opens and closes both contacts 23a and 23b of the vacuum interrupter 23. 24
26 is a pressure contact spring, 26 is a stopper, and 27 is a cutting spring. The cutting spring 27 is always connected to the connecting arm 22.
is biased downward.

The roller 14a is connected to the tripping hook 31.
shaft 33 of the tripping hook 31
is fixed to the mounting plate 3. Tripping hook 31
A counterclockwise rotational force is applied to the leaf by a spring 31a, and a stopper 32 is provided at the other end to restrict rotation, and the leaf is in contact with the plunger 30 of the shear cutting electromagnet 29. On the other hand, gear 50,5
A feed pawl 51 and a stop pawl 53 are respectively engaged with 2, and these pawls 51 and 53 are pivotally supported by a swing plate 54 via shafts 51a and 53a. The rocking plate 54 is connected to a crank 57.
is connected to a motor 59 via an eccentric cam 58. Note that 56 is a limit switch that engages with the cam 55, detects the rotation of the operating shaft 7, and starts the motor 59.

The operation of the spring operating device will now be described with reference to FIGS. 2 and 3, which schematically illustrate the mechanism.

FIG. 2 shows the cut-off state, with the closing spring being energized. In the figure, when the closing electromagnet 10 is energized, the plunger 11 turns the closing hook 78 counterclockwise around the shaft 9, and the closing electromagnet 10 is energized.
Since there is nothing to prevent the rotation of the operating shaft 7
The input cam 5 is rotated counterclockwise via the input cam 5, and the output links 12 and 14 are moved to the left in the figure. At this time, the roller 12a comes into contact with the stopper 34 and stops. When the output links 12, 14 move, the connecting rod 18 is pushed downward, so that the operating arm 1
9, the operating rod 21 and the arm 22 are pushed upward against the tension of the break spring 27, and the contact of the vacuum interrupter 23 is closed (third
figure).

When the closing operation is completed in this way, the crank 5 in the power storage mechanism of the shear spring 4 shown in FIG.
7 is swung by the motor 59, the closing spring 4 is energized, and the closing cam 5 and closing latch 6 are returned to the state before the closing operation (FIG. 2). Insertion hook 8
At the same time as the closing electromagnet 10 is de-energized, a clockwise rotational force is applied by the return spring 8b (FIG. 1). In this way, the closing state shown in FIG. 3 is formed.

Therefore, when the shear cutting electromagnet 29 is energized, the plunger 30 pushes up one end of the tripping hook 31 and rotates the hook 31 clockwise, so that the output links 12, 14 and the hook 31
The connection will be removed. Since the output links 12 and 14 are pushed upward by the armature spring 27, when the engagement is released, the output link 1
Roller 12a at the joint of 2 and 14 (Fig. 1)
The roller 14a at the joint of the output links 14 and 15 projects to the left, and the connecting rod 18 moves upward, so the operating rod 21
The arm 22 then moves downward to release the contacts 23a and 23b of the vacuum interrupter 23. When the excitation of the cut-off electromagnet 29 is released, the tripping hook 3
1 is rotated counterclockwise by the return spring 31a (Fig. 1) until it abuts against the stopper 32, and the second
Return to the state shown in the figure.

By the way, the closing electromagnet 10 can be energized only when the cutter or disconnector is in the cut-off state, and the cut-off electromagnet 29 can be energized only when the cutter or the cutter is in the cut-off state. , an electrical interlock is provided in the control circuit. but,
There is no interlock between the manual operation handle for manually operating these electromagnets 10 and 29 and the charging electromagnet 10.

Therefore, the manual operation handle will be explained with reference to FIG. 4.The manual operation handle 35 protrudes outward from the mounting plate 3 of the disconnector.
By rotating 5 to the left and right, it is possible to perform a loading or shearing operation. However, in order to prevent erroneous operation, pull the manual operation handle 35 toward you and rotate it in any direction to operate it, and when you release your hand after the operation, a spring mechanism (not shown) will cause the manual operation handle 35 to return to its original position before operation. It is starting to return to its position. 3
6 is a shaft rotated by a manual operation handle 35, 37 is a manual input cam fixed to the shaft 36, and 38 is a beveled cam also fixed to the shaft 36. When the manual operation handle 35 is pulled toward you and turned clockwise, the cam 37 pushes the plunger 11 of the charging electromagnet 10, rotates the charging hook 8, and the contacts 23a and 23b of the vacuum interrupter 23 are closed to perform the charging operation. will be carried out. Furthermore, when the manual operation handle 35 is pulled forward and turned counterclockwise, the plunger 30 of the stop-off electromagnet 29 is pushed up by the cam 38, and the trip hook 31 is turned clockwise, so that the vacuum Contacts 23a, 23b of interrupter 23
is released to complete the shredding operation.

Therefore, in the state shown in FIG. 3 in which the breaker is in the closed state, the closing spring 4 is loaded with energy, so when the manual operation handle 35 is pulled toward you and turned clockwise, the cam 37 Then, the plunger 11 of the charging electromagnet 10 is pushed, the charging hook 8 is rotated counterclockwise, the closing latch 6 is rotated counterclockwise, and the energy stored in the closing spring 4 is released.
Therefore, the charging cam 5 rotates counterclockwise, and unlike the state shown in FIG. 2, the charging cam 5 is in a no-load state and rotates at a very high speed. Thus, the feed pawl 51 and the stop pawl 53 that engage with the gears 50, 52 in the spring operating mechanism 60 shown in FIG.
may destroy both. In other words, since these pawls 51 and 53 operate by meshing with each tooth of the gears 50 and 52, when these gears 50 and 52 rotate in reverse, they receive a strong impact every time they pass over the teeth. To receive the gears 50, 52
The smaller pawls 51 and 53 are easily damaged, and in some cases, the teeth of the gears 50 and 52 may be missing.
Or the rocking plate 54, the crank 57, the eccentric cam 5
8 and motor 59 receive a strong impact.

The purpose of the present invention is to eliminate the drawbacks of the above-mentioned conventional spring operation device for a shredder cutter, and in particular, when the shredder cutter is in the closing state, even if the manual operation handle is operated, the closing spring is not released. To provide an interlock device that does not apply excessive impact force to the energy storage mechanism of the closing spring and does not damage or destroy the feed pawl, stop pawl or gear. be.

An embodiment of the present invention will be described below with reference to main part configuration diagrams shown in FIGS. 5 to 8. Therefore, each component other than the main part is the same as the conventional example,
Moreover, they have the same effect.

FIG. 5 is a front view of the main part, and FIG. 6 is a view taken along the line XX in FIG.

Therefore, the present invention provides a shaft portion 41 that connects the connecting rod 18, the output link 15, and the lever link 16.
The roller 4 has one end in contact with the input hook 8 and the other end in contact with the input hook 8.
A V-shaped interlock lever 39 that collides with a bearing 45 in 3 is rotatably supported on a shaft 46. This interlock lever 39 is provided with a return spring 39a to urge it to rotate counterclockwise. 40 is a stop pin of the interlock lever 39, which is fixed to the mounting plate 3 together with the shaft 46.

In the state shown in FIG. 5, the other end of the interlock lever 39 is in a free state, so when the closing electromagnet 10 is energized and the plunger 11 rotates the closing hook 8 counterclockwise, the closing latch is opened. The closing hook 8 engaged with the latch portion 42 of 6
The roller 43 comes off from the latch 42, and the operating shaft 7
Release the rotation restriction. The operating shaft 7 is rotated counterclockwise by the release of the closing spring 4, and the closing cam 5 moves the output links 14, 15 to the right in FIG. Therefore, the shaft 41 moves downward. The counterclockwise rotation of the interlock lever 39 by the return spring 8b is regulated by a bearing 45 attached to the tip of a shaft 44 of a roller 43 provided at the tip of the input hook 8. When the closing electromagnet 10 is de-energized, the closing hook 8 receives a clockwise return rotational force, so that the roller 43 comes in contact with the outer periphery of the closing latch 6 and is interlocked therewith. When the closing operation is completed, the energy accumulating mechanism operates to rotate the closing latch 5 counterclockwise in the same manner as when the closing spring 4 is released. As the rotation of the closing latch 6 progresses and the roller 43 engages with the latch portion 42, the interlock lever 39 closes the pin 4.
Rotate counterclockwise until regulated by 0,
The tip of the interlock lever 39 collides with the outer periphery of the bearing 45, as shown in FIG. In this state, the manual operation handle 35 shown in FIG.
Even if an attempt is made to turn the charging hook 8 counterclockwise by pulling the cam 37 and turning it clockwise and pushing the plunger 11 of the charging electromagnet 10 with the cam 37, the charging hook 8 is not provided at the tip of the roller shaft 44. Rotation is prevented by interlock lever 39 in abutting engagement with bearing 45.

When the shearing operation is performed, the shaft 41 is pushed upward and the interlock pin 39 is pushed up against the shaft 41.
The interlock pin 3 is rotated clockwise by the
9 is disengaged from the bearing 45, and the fifth bearing 45 is disengaged.
Since the state shown in the figure is reached, the breaker can be turned on by operating the manual operation handle 35 or by energizing the charging electromagnet 10.

Therefore, when the closing operation of the breaker is performed, that is, when the closing hook 8 is rotated clockwise in the figure by energizing the closing electromagnet 10 or operating the manual operation shaft 35, the roller 43 is rotated clockwise in the figure. The state of the bearing 45 provided at the tip of the shaft 44 is as follows. In other words, the intersection point B of the upper surface A of the interlock lever 39, the outer periphery of the bearing 45, and a line connecting the center of the bearing 45, that is, the center of the shaft 44, and the center of the pin 9 is a trajectory drawn as the closing hook 8 rotates. An appropriate gap δ is provided between the two (Fig. 5).

Furthermore, the return rotational force of the interlock lever 39
The relationship between M ₁ and the return rotational force M ₂ of the closing hook 8 is as follows:
Make sure that μP ₁ <P ₂ (Figure 7). The roller 43 locks into the closing latch due to the return rotational force _M2 of the closing hook 8, which is greater than the force _μP1 , which is obtained by multiplying the force _P1 received by the bearing 45 by the return rotational force _M1 of the interlock lever 39 and the friction coefficient of the bearing. Make sure that the force P ₂ that is pressed against 6 is a sufficiently large force. This is because after the breaker is turned on, the energy storage mechanism of the closing spring 4 operates, and the energy storage is completed and the roller 4
The purpose is to prevent the interlock lever 39 from interlocking the latch 3 into the latch portion 42 of the closing latch 6.

Further, the interlock lever 39 is connected to the roller 4.
3 is completely inserted into the latch portion 42, it is released from the restraint by the closing hook 8, and is rotated counterclockwise by the return rotational force _M1 until it comes into contact with the stop pin 40 (FIG. 8). If you try to turn the closing hook 8 in order to release the closing spring 4,
The rotational force M3 applied to the closing hook ₈ is received by the contact point of the end surface C of the interlock lever 39 with the bearing 45. Rotational force M ₃ at this contact point
Assuming that the C-plane is a part of a circular arc centered on the center of the axis 46 and having a radius R, the force P ₃ exerted on the contact point by the rotational force M ₃ is equal to the normal force P ₄ and the tangential line. The force P can be decomposed into ₅ and the normal force is the axis 4
The rotational force generated by the tangential force _P5 of _P5.R is received by the stop pin 40 and the shaft 46. That is, in order to release the closing spring 4,
The rotational force applied to the closing hook 8 generates a counterclockwise rotational force on the interlock lever 39, and the stop pin 40 and shaft 46 resist the rotational force and prevent the interlock pin 39 from rotating. 43 comes off from the latch portion 42 and the closing spring 4 is not released.

According to the present invention described above, the output link 15
An interlock lever 39 is provided to prevent the movement of the charging hook 8 in conjunction with the movement of the charging hook 8, so that the charging hook 8 will not come off the charging cam 6 even if the manual operation handle 35 is erroneously operated when the breaker is in the closing state. As a result, an accident in which the stored energy of the operating spring 4 is released when the operating spring 4 is disconnected will not occur, and the spring operating device will not be subjected to excessive impact due to the high-speed rotation of the operating shaft 7. or stop claw 5
There is no risk that 3 will be damaged or destroyed.

In addition, the structure of the present invention is simple and easy to assemble, and it is easy to attach to an existing breaker, so it has the effect of extending the durability of the breaker and increasing the product value. be.

[Brief explanation of the drawing]

Figures 1 to 3 show a conventional example, Figure 1 is a perspective view of the spring operating device, Figures 2 and 3 are action explanatory views, and Figure 4 is a partial enlargement of Figure 2 or 3. It is a front view. 5 to 8 show an embodiment of the present invention, and FIGS. 5, 7, and 8 are front views of main parts, and FIG. 6 is a view taken along the line X--X in FIG. 5. . 8...Input hook, 15...Output link, 16
... Lever link, 18 ... Connection rod, 39 ...
...Interlock lever, 40...Stop pin, 41...Shaft, 43...Roller, 45...Bearing.

Claims (1)

[Claims] 1. The shearing operation and the closing operation are performed by a bullet machine consisting of a shearing spring and a closing spring, respectively, and when the loading hook is released in the shearing condition, the loading cam rapidly rotates and the closing action is applied to the closing spring. In the breaker which performs the closing operation by releasing stored energy, one end abuts the shaft portion 41 connecting the connecting rod 18 with the output link 15 and the lever link 16, and the other end contacts the closing hook 8. An interlock lever 39 which is biased so as to be able to collide with a bearing 45 in a roller 43 is rotatably supported, and a stop pin 40 for regulating the rotation of the interlock lever 39 is provided protrudingly. Features an interlock device for the closing spring of the breaker.