JPS6222210B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electric spring operation mechanism that uses the rotational force of an electric motor to store energy in a closing spring and an opening spring, and uses the energy to open and close a disconnector. This invention relates to an electric spring operating mechanism designed to improve force transmission efficiency.

In general, electric spring operating mechanisms are widely used because they provide a strong operating force even if the capacity of the operating power source is small, and the operating force is stable regardless of voltage fluctuations. However, the conventional electric spring operation mechanism has the following drawbacks compared to other electric operation mechanisms and compressed air operation mechanisms.

(1) The mechanical structure is complex and has many parts, and therefore the number of failures is high.

(2) Poor power transmission efficiency. In particular, about half of the energy of the closing spring is lost as friction loss at the pin portion of the transmission mechanism, and the remaining half only serves effectively to increase the closing speed.

(3) The impact during opening/closing operation is large. This is because the force of the strong closing spring is released instantaneously, and the direction of transmission of that force changes in a complicated manner.

Another example of an electric spring operation mechanism is a so-called claw energy storage system that converts the rotation of an electric motor into reciprocating motion, transmits this to a ratchet to decelerate rotation of a pawl gear, compresses the spring in half a rotation, and operates the spring in the remaining half rotation. There is a drive method, but this method concentrates stress at the tip of the claw, which limits the transmission force, and requires careful attention to the manufacturing process of the claw, making the upper claw part the weak point, which can lead to various problems. It's getting old. As a countermeasure, the rotation of the electric motor is transmitted to the screw, the vertical movement of the screw shaft compresses the spring, the force is held by the closing catch, and then the rotation of the electric motor is reversed to return the screw to its original position. There is a so-called screw energy storage drive system that is prepared for the following operations. In this case, a switch or relay is required to change the motor from normal rotation to reverse rotation, and various measures are required for the related operations of the screw portion and the closing catch, resulting in an unavoidably complicated structure.

As described above, the electric spring operating mechanism consists of a part that compresses (or tensions) the closing spring, a catch mechanism part that releases the spring, a transmission mechanism part that transmits the releasing force to the cutter body, and It is necessary to include a free trip mechanism in the transmission mechanism. Since force is transmitted through a large number of parts in this way, the loss is large, and the direction of force transmission is often changed, resulting in a large impact during operation.

Furthermore, in the case of an electric spring operating mechanism, the stored energy of the tensioned or compressed closing spring is released in the closing operation, but most of that energy is spent compressing or tensioning the opening spring. In this process, the following problems arise due to the characteristics of the spring.

That is, a closing spring is strong at the start point of release and weak at the end point, whereas an open spring that is stored is weak at the beginning and requires a strong force at the end point. Therefore, even at the point where the closing operation is completed, a very strong spring is required to have a spring force that can overcome the strong force of the opening spring. This means that at the beginning of the closing operation, the opening spring is at its weakest, whereas the closing spring is at its strongest, and as a result, the impact during operation becomes large, and increases as the speed and load increase. Conventionally, methods for mitigating this impact include rotating the cam with a closing spring or providing a link mechanism in the middle to change the force transmission ratio. However, the number of transmission parts increases,
As a result, the loss increases, and the closing spring must be made stronger accordingly.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an electric spring operating mechanism which eliminates the various drawbacks described above, and which can simplify the mechanism, reduce the number of parts, and reduce mechanical loss.

An embodiment of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 denotes a frame that houses the entire operating mechanism. On a mounting plate 2 fixed to the bottom of the frame 1, an electric motor 3 and a reduction gear mechanism are connected to the electric motor via a coupling 4. 5 is installed, and a cam 7 for charging spring energy storage is attached to a camshaft 6 pulled out from the deceleration mechanism 5. 8 is a main shaft fixed to a support member (not shown) in the frame 1, and a drive lever 9 is mounted on this shaft 8.
A tripping catch lever 10A and a closing catch lever 10B are each rotatably supported. Drive lever 9 and closing catch lever 10
A movable shaft 12 is pivotally supported on the movable side of B, one end of a closing spring 13 is engaged with this movable shaft 12, and the other end is engaged with a fixed pin 14. Also, the movable shaft 12
When the cam 7 to which the roller 15 is inserted rotates in the direction of the arrow, the movable shaft 12 is pushed up by the cam 7 via the roller 15, rotates counterclockwise by a predetermined angle, and loads the closing spring 13. do. 16 is a micro switch that is opened and closed by the movable shaft 12;
7 is a switch cam 18 provided on the camshaft 6
These switches 16 and 17 are inserted into the operating circuit of the motor 3, and as described later, the switch 16 closes at the same time as the end of the heel cutoff operation, starts the motor 3, and stores the closing spring 13. When the cam 7 passing through the energy storage completion point reaches a position where it does not interfere with the next closing operation, the switch 17 is opened and the electric motor 3 is stopped. 20
is a connecting rod connected to a pin 21 pivotally supported on the movable side of the tripping catch lever 10A, one end of an L-shaped lever 22 is connected to the other end of this connecting rod 20, and the other end of the lever 22 has a coupling 23. An insulating rod 26 coupled to the movable electrode 25 of the intermediary and disconnector 24
connected to. Further, a spring receiver 28 is provided at the end of the stud 27 extending from the connecting rod 20, and one end of the opening spring 29 is held in this spring receiver 28, and the spring 29
The other end is supported on a fixed part.

The shield breaker 24 shown above shows the case where a vacuum shield breaker is used, which is placed on the frame 1. If they are arranged independently and with the necessary insulation distance between them, each L-shaped lever 22 is attached to the extension of the stud 27, as shown by the chain line in FIG.
The insulating rods 26A connected to the movable electrodes of each phase and cut section are connected through A.

30A is a tripping catch mechanism provided on the tripping catch lever 10A to maintain the open circuit spring 29 in a stored state when the disconnector is closed, and 30B is a tripping catch mechanism provided on the closing catch lever 10B to open the disconnector. 45 is a closing catch mechanism that keeps the closing spring 13 in a stored state when the circuit is closed; 45 is a tripping coil that is energized by the opening command and trips the tripping catch mechanism 30A to open the circuit breaker; 46 is a closing coil; This is a closing coil that is energized by a command and trips the closing catch mechanism 30B to close the breaker.

The tripping catch mechanism 30A is implanted in the tripping catch lever 10A as shown in FIG. Lever 35A and fixed pin 3 connected to drive link 32A via link 37A
The prop pin 33A of the drive link 32A has a trip lever 38A that is supported by the lever 35A and is supported by the lever 35A.
rides on the tip of the prop 42A which is pivotally supported by the pin 41 of the fixed part 40, restrains the rotation of the tripping catch lever 10A in the counterclockwise direction (opening direction), and keeps the opening spring 29 in the energized state. .

As shown in FIG. 2, the closing catch mechanism 30B has a drive link 32B provided with a prop pin 33B on the closing catch lever 10B, and a link 37B, similar to the above tripping catch mechanism 30A.
Lever 35B and this lever 35 connected via
A trip lever 38B that engages with the trip lever 38B and a prop 42B that is pivoted on a fixed portion and engages with the prop pin 33B are provided, but the arrangement direction of each of these parts is opposite to that of the tripping catch mechanism 30A. The difference is that they are different.
In other words, the closing spring 13 is charged, and at the point where the loading is completed, the prop pin 33B of the drive link 32B is locked to the prop 42B, and the closing catch lever 10 is locked.
B is restrained from rotating clockwise (in the closing direction) and the closing spring 13 is charged. Note that 43A is prop 42
43B is a stopper for positioning the direction of prop 42B; 43B is a stopper for positioning the direction of prop 42B;
4 is a damper for positioning the coupling ring 23;
7 is a stopper for positioning the drive lever.

Next, the operation of the electric spring operating mechanism will be explained. As shown in FIG. 2, when the tripping coil 45 is energized by a tripping command while the closing breaker 24 is in the closed state and the closing spring 13 and the opening spring 29 are energized, the state shown in FIG. As shown, when the tripping lever 38A of the tripping catch mechanism 30A is rotated, the link connection is broken and the prop pin 33A mounted on the prop 42A is released. As a result, the force of the opening spring 29 causes the tripping catch lever 10 to move as shown in FIG.
A rotates counterclockwise and lowers the movable electrode 25 via the lever 22, causing the coupling 23 to hit the damper 44 and become open. During this time, the cam 7 and drive lever 9 for accumulating the closing spring energy, the closing catch lever 10B, and the closing catch mechanism 30B do not operate.

Next, the closing operation will be explained. Shiya disconnector 24
is in an open state (see FIG. 5) due to the above-mentioned tripping operation, and the closing spring 13 is charged and kept in the loaded state as shown in FIG. 2 by the closing catch mechanism 30B, so that the overall In this case, the operation is started from the combination state shown in FIGS. 2 and 5. Now, when the closing coil 46 is excited by the closing command, the closing trip lever 38B of the closing catch mechanism 30B operates, and the link connection is broken (the details of the operation are exactly the same as in the case of the tripping catch mechanism 30A described above). The restraint of the feeding catch lever 10B is released,
It rotates clockwise by the force of the closing spring 13.
At the same time, the drive lever 9 also rotates clockwise, and as shown in FIG. rotates clockwise as a unit. When the tripping catch lever 10A rotates, the lever 22 also rotates counterclockwise via the connecting rod 20, causing the movable electrode 25 to rise and the line breaker 24 to close. At the same time, the opening spring 29 is compressed and stored. Then, at the closing completion position, the drive lever 9 moves to the stopper 47 as shown in FIG.
The catch mechanism 30A stops when it hits the
The prop pin 33A is locked to the prop 42A, and the counterclockwise rotation of the tripping catch lever 10A is prevented.

Although the closing operation is now complete, the charging operation of the closing spring 13 is subsequently started. That is, the micro switch 16 is activated by the operation of the drive lever 9.
(see FIG. 2) is closed, the electric motor 3 starts rotating from the state shown in FIG. 1, and the cam 7 is rotated clockwise. Due to this rotation of the cam 7, the movable shaft 12 of the drive lever 9 contacts the cam 9 via the roller 15 and is lifted up, and the drive lever 9 rotates counterclockwise and at the same time pulls the closing spring 13. As the force is accumulated, the closing spring 13 is stretched to the maximum just before the cam 7 separates from the roller 15 as shown in FIG. At this time, the prop pin 33B of the closing catch mechanism 30B, which was rotating together with the drive lever 9, rides on the prop 42B, and the reverse rotation of the closing catch lever 10B in the clockwise direction is prevented. On the other hand, the cam 7 continues to rotate and when the roller 15 and the cam 7 separate and reach a position where they do not interfere with the next closing operation, the micro switch 17 is opened by the switch cam 18 and the movable shaft 3 is stopped. This completes the operation from the closing operation to charging the closing spring.

Next, the free tripping operation of the above device will be explained with reference to FIG. FIG. 4 shows a state in which the tripping catch mechanism 30A is tripped by the excitation of the tripping coil 45, as explained in the tripping operation above, and the solid line A indicates the position of the drive lever 9 when it is opened. , and dotted line B indicates the position at the time of injection. Then, even if the drive lever 9 is in any position from the open position A to the closing position B, the tripping catch mechanism 3
The 0A drive pin 34 and the drive lever 9 no longer come into contact with each other. That is, when the link connection of the tripping catch mechanism 30A is broken by a tripping command, the drive link 32A rotates and the prop pin 33A is removed from the prop 42A, and at the same time the drive pin 34 also rotates. However, it comes off and becomes free to trip.

The electric spring operating mechanism configured as described above has the following features.

(1) The structure of the mechanism is simplified and the number of parts is small. That is, the drive lever 9 and the closing catch lever 10A.
acts as an integrated lever, and by connecting the closing spring 12 and the opening spring 29, the closing operation can be performed, and the energy storage of the closing spring 13 is also achieved by pushing up the drive lever 9 with the cam 7. Since the structure and operation are the simplest, and since the trip catch mechanism 30A and the input catch mechanism 30B have the same structure and are both incorporated into the main shaft 8, the number of parts is the same as that of the conventional type. This will be reduced by almost half.

(2) Good power transmission efficiency. As mentioned above, the number of links is greatly reduced due to the simplification of the closing operation, and therefore the loss during the closing operation is reduced to about 1/3 of that of the conventional type.

(3) Less shock during operation. As mentioned above, the mechanism is simplified and the closing spring 13 and main shaft 8, which are subject to high loads, are supported in a well-balanced manner.
The impact is alleviated when the closing spring 13 compresses the opening spring 29 during the closing operation. That is, as shown in FIG. 6, ignoring the force transmission loss between the drive lever 9 in the open state and the tripping catch lever 10A, the force of the closing spring 13 is F ₁ and the opening spring 29 is
Let F ₂ be the force of F 2 , and let l ₁ and l ₂ be the distances from the line of action of spring forces F ₁ and F ₂ to the center of rotation, then the stored force F ₂ of the opening spring 29 is F ₂ B≒F ₁ l ₁ /l ₂ , but when the spring force F ₁ is large at the initial stage of injection, l ₁
> l ₂ , and if the spring force F ₁ decreases at the closing end point, l ₁ > l ₂ . Therefore, the balance of force transmission during the operating process is improved, and excessive shock at the time of injection is significantly reduced.

In the embodiment shown in FIG. 7, a piston 60 operated by compressed air, a cylinder 61, a solenoid valve 62, a closing coil 63, and an air tank 64 are provided in place of the closing spring, and the piston 60 is connected to the drive lever 9 via a coil 65. It is something. Although the figure shows the state at the instant when the closing is completed, the air in the cylinder 61 is subsequently exhausted and the force of the return spring 66 causes the piston 60 to
returns to the position before the closing operation, and at the same time the drive lever 11
It also returns to its original state and prepares for the next closing operation. The tripping operation is the same as in the previously described embodiment of the electric spring operating mechanism. In this way, the closing spring can be replaced with pneumatic operation, as well as hydraulic operation or electric operation.

As described above, according to the present invention, it is possible to provide an electric spring operating mechanism that has a simplified mechanism configuration, has a small number of parts, has high force transmission efficiency, and is economically and functionally superior.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the electric spring operating mechanism according to the present invention, FIG. 2 is a perspective view, FIG. 3 is a detailed view of the tripping catch mechanism, and FIG. 4 is an operation showing the tripping state. FIG. 5 is an explanatory diagram of the operation showing an open state, FIG. 6 is an explanatory diagram of the operation process in progress, and FIG. 7 is a schematic diagram of main parts showing another embodiment of the present invention. 3...Electric motor, 5...Reduction mechanism, 7...Cam,
8... Main shaft, 9... Drive lever, 10A... Catching lever for tripping, 10B... Catching lever for closing, 12... Movable shaft, 13... Closing spring, 20...
...Connecting rod, 22... Lever, 24... Sheath disconnector, 2
9... Opening spring, 30A... Tripping catch mechanism, 30B... Closing catch mechanism, 45... Tripping coil, 46... Closing coil.

Claims (1)

[Claims] 1. A cam that is rotated by an electric motor via a speed reduction mechanism, a movable shaft that is pivoted on the movable side of a drive lever and a closing catch lever that are respectively pivotally supported on a fixed main shaft, and that is rotated by the cam; a closing spring that stores energy as a result of rotation of a shaft; a closing catch mechanism that prevents rotation of the closing catch lever in the closing direction at the point where the closing spring completes storing energy and maintains the closing spring in the loaded state; A closing coil that releases the closing by tripping the closing catch mechanism is connected to the movable side of a tripping catch lever pivotally supported on the main shaft, and the other end is connected to the movable electrode of the disconnector via the lever. A connecting rod that is connected and supports one end of the opening spring via a spring receiver, and a movement of the drive lever rotated when the closing spring is released in the closing direction is transmitted to the tripping catch lever to cause the tripping. A tripping operation in which the connection rod is made to close through a catch lever for use, and the opening spring is charged with energy, and at the point where the release is completed, rotation of the tripping catch lever in the opening direction is prevented and the opening spring is kept in the charged state. An electric spring operation mechanism comprising a tripping catch mechanism and a tripping coil which trips the tripping catch mechanism and opens the operating rod by releasing the opening spring.