JPH0568083B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an on-load tap switching device that quickly switches taps of transformers, reactors, etc. without power outage, and particularly relates to an on-load tap switching device. This invention relates to an improvement in a power accumulating mechanism in which, after the power accumulating mechanism of a switching switch operates to perform a tap change, the power accumulating mechanism is reliably locked and held so that the next tap change operation can be carried out smoothly and well. .

[Conventional technology]

The switching switch in a resistive load tap switching device instantly releases the energy stored in the energy storage spring of the energy storage mechanism, thereby switching each contactor of the switching switch or each of the above-mentioned It is configured to open and close each vacuum switch corresponding to a contact while maintaining a predetermined switching sequence.

In particular, in recent years, the transformer itself has been changed in consideration of disaster prevention.
From an oil-filled transformer, for example, SF ₆ gas filled, i.e.
Gas insulated transformers have come into use.
For this reason, in load tap switching devices, if the current is interrupted by a contact exposed in the gas, the insulation properties of the gas may be impaired due to arcing problems or flying metal pieces. Vacuum switches are increasingly being used in place of contacts. In this case, since the drive source is an electric motor, it is necessary to convert its rotational motion into linear reciprocating motion necessary for opening and closing the vacuum switch. As an energy storage mechanism that opens and closes each contact of the switching switch while maintaining a predetermined switching sequence, for example,
The energy accumulating mechanism shown in Japanese Patent Publication No. 52-47131 is well known, and its schematic structure will be explained with reference to FIGS. 9 and 10.

The guide frame 1 and drive frame 2 of the energy storage mechanism X are mounted so as to be movable back and forth within the casing 4 by guide rods 3 and 3', respectively. That is, each frame 1, 2
A flange 5 is integrally formed at each end of the flange 5, and the guide shafts 3, 3' are inserted through guide portions 6 provided on the flange 5. Each frame 1,
A storage spring 7 is inserted between the flanges 5, 5 at both ends of the guide rod 2, and is loosely fitted to the guide rods 3, 3'.
A shaft drive shaft 8 is supported by a bearing of the casing 4 and penetrates each of the frames 1 and 2 from a direction perpendicular to the forward and backward directions thereof. An eccentric disk 10 that rotatably fits between the parallel guides 9, 9 is attached,
The lower part is connected to a tap selector (not shown). Further, below the center of the drive frame 2, a switching crank 11 rotatably attached to the drive shaft 8 and a cam plate 12 provided on the upper surface of the switching crank 11 are provided, and the cam plate 12 is engaged. It is drivingly connected to the drive frame 2 via a pin 13. Furthermore, a release piece 15 for releasing a pair of locking pieces 14, 14' pivotally supported on the casing 4 is provided on a side perpendicular to the advancing and retreating direction of the guide frame 1. Moreover, the locking piece 1
4 and 14', one locking piece is always attached to the cam plate 12.
A tension spring 17 is inserted between the ends so as to be able to engage and hold the engaging portion 16 of the end portion.

When the eccentric disk 10 is rotated by the drive shaft 8, the guide shaft 1 moves to the left in FIG. 9 along the guide shafts 3 and 3', and the guide frame 1 is unevenly distributed with respect to the drive frame 2. Accordingly, the energy storage spring 7 is stored between the flanges 5, 5 of the guide frame 1 and the drive frame 2. In this state, the release piece 15 of the guide frame 1 presses the locking piece 14 against the force of the tension spring 17, and when the locking piece 14 and the cam plate 12 are disengaged, the drive frame 1 is moved to the left side in FIG. 9 by the stored force of the storage spring 7, and rapidly rotates the cam plate 12, which is drivingly connected via the engagement pin 13, counterclockwise in FIG. The switching crank 11 is configured to rapidly switch a switching switch of a load tap switching device (not shown) by moving the switching crank 11.

[Problem to be solved by the invention]

However, in the mechanism of the conventional tap changer under load, when the surrounding medium is insulating oil, the arc generated when each contact opens contaminates the insulating oil, and the sludge floating in the insulating oil is removed from the guide shaft 3. ，
If the lubricant applied to the drive part of the energy storage mechanism adheres to drive parts such as the drive parts 3', guides, and guide parts 6 of drive frames 1 and 2, or in the case of insulating gas such as SF ₆ gas, the lubricant applied to the drive parts of the energy storage mechanism may When the guide and drive frames 1 and 2 are exhausted due to use, the drive guide shaft 3,
3', there was a risk that a large frictional force would occur, making smooth operation impossible.

That is, when the switching switch is switched, the energy storage mechanism moves the drive frame 2 by the energy storage force of the energy storage spring, rotates the cam plate 12, and locks the cam plate 12 after the rotation. It is configured to be engaged with the piece 14 or 14' in preparation for the next switching operation. but,
As mentioned above, if the frictional force in the drive part of the energy storage mechanism becomes large for some reason, the energy storage force of the energy storage spring 7 cannot be applied effectively, and as a result, the movement of the drive frame 2 is prevented. , becomes slow just before engaging the engaging portion 16 of the cam plate 12, and after the cam plate 12 rotates, the locking piece 14 or 14' is attached to the engaging portion 16 of the cam plate 12.
The switching of the switching switch ends without being able to smoothly engage the switch. In this case, even after the locking pieces 14 and 14' are released, the eccentric disk 10
The electric motor continues to rotate until it stops, but
At this point, the energy storage spring 7 is located within the guide frame 1 and does not act on the drive frame 2, so
Even if the guide frame 1 can be moved by the eccentric disc 10, the drive frame 2 cannot be moved and the locking piece 14 or 14' cannot be engaged with the cam plate 12. When the drive shaft 8 is rotated in this state for the next switching, since the cam plate 12 is not locked by the locking piece 14', the drive frame 2 will also move along with the guide frame, causing the storage spring to move. 7 becomes unable to store energy, and the cam plate 12 also rotates via the engagement pin 13 due to the movement of the guide plate 2. In this situation, the changeover switch and the tap selector operate almost simultaneously, that is, the tap selector changes the taps and the contact of the changeover switch almost simultaneously, and the tap selector operates almost simultaneously. The operation is carried out in a state where the timing of both devices is out of sync, causing a momentary power outage. Further, the switching switch cannot utilize the stored force of the storage spring 7, and operates at the driving speed of the electric motor, so instantaneous switching cannot be performed. As a result, it takes a long time to switch the taps, and at the time of switching, current flows through a current limiting resistor (not shown) for a long time, which may cause a burnout accident. Furthermore, when changing the contacts of a changeover switch, the longer the switching time, the longer the arc will last, resulting in the problem of accelerated wear and tear on the contacts. Further, it is thought that the above-mentioned problem can be solved to some extent by using a large-sized energy storage spring in order to increase the energy storage force, but this increases the size of the energy storage mechanism itself and is uneconomical.

In view of the above-mentioned problems, the present invention adds a locking cam plate to the eccentric disc that moves together with the drive shaft when switching the switching switch, and by making it work together with the eccentric disc, the energy storage mechanism is activated. When the operation of the drive unit becomes slow, the driving force of the electric motor is effectively used to forcibly drive the locking cam plate to prevent the locking piece of the energy storage mechanism and the switching crank from switching after the switching switch is switched. An object of the present invention is to provide a power storage mechanism for a tap switching device under load, which securely locks the cam plate and prevents current limiting resistor burnout, power outage accidents, etc. that occur during the next tap switching operation. .

[Means to solve the problem]

The drive frame is slidably attached to a guide shaft installed between the support walls of the machine frame, and a sliding body is mounted on the drive frame and is loosely engaged with the guide shaft and slides independently of the drive frame. A storage spring is inserted between the drive frame and the sliding body, and the energy is stored by the sliding of the sliding body, and when the drive frame moves to a predetermined position on the machine frame side, each A locking piece is provided to lock the drive frame in position, and a release piece is installed on the drive frame side to release the locking of the drive frame by the locking piece when the sliding body slides, and further, on the sliding body, The present invention is characterized in that a locking cam plate is provided which co-operates with the drive shaft to forcibly move the drive frame to a predetermined position to ensure locking with the locking piece.

[Effect]

After the storage force of the storage spring is stored by the movement of the sliding body, when the drive frame is released, the drive frame rapidly moves to a predetermined position by the storage force of the storage spring and the locking piece is released. Immediately before the locking cam plate, which operates in conjunction with the electrically driven drive shaft, is locked by the
This drive frame is pushed so as to serve as an auxiliary to the stored force of the energy storage spring, so that the drive frame is reliably locked in a fixed position, and the drive frame is not locked when the tap is changed. The present invention is characterized in that it reliably prevents accidents such as burnout of the current limiting resistor that would otherwise occur, as well as power outage accidents that would occur due to a timing shift in switching between the switching switch and the tap selector.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 8. The present invention will be described with reference to an example in which a vacuum switch is used as a contactor of a switching switch.

In FIG. 1, reference numeral 20 indicates a switching switch of a load tap switching device, and this switching switch 20 includes a frame 21 and an energy storage mechanism 25 attached to the frame
, a vacuum switch drive mechanism 65, a plurality of vacuum switches 70, and a current limiting resistor 80.The structure of each mechanism and member will be explained below.

The frame body 21 is constructed by connecting a base plate 22 with a bearing cylinder 82 mounted at the center, an upper frame 23 disposed above the base plate 22, and a lower frame 24 disposed below the base plate 22 by a connecting rod 81.

The energy storage mechanism 25 includes an energy storage section 26, an operation section 27 for operating the energy storage section 26, and a drive section 28 that is driven by the energy storage section 26. The frame 26a consists of a support plate 29 fixed to the substrate 22 via support columns, and support walls 30, 30 standing upright at both ends of the support plate 29. A guide shaft 31 is provided between the support walls 30, 30.
31 are arranged in parallel in the front-rear direction (vertical direction in the figure) as shown in FIG.
31, a drive frame 33 is formed on a rectangular frame with a horizontally long vertical cross section, and has a long hole 32 formed in the center thereof for passing through the drive shaft 83 through the bearing tube 82. A bearing 34 is interposed between the support walls 30 and 30 to allow left and right movement (in the left and right direction in FIG. 3). On the drive frame 33,
As shown in FIGS. 1 and 2, a sliding body 35 is mounted on the sliding body 35, and this sliding body 35 has two vertically disposed vertically extending directions on both sides (vertical direction in FIG. 2) perpendicular to the direction of advance and retreat. By fitting the flanges 36, 36 onto the guide rods 31, 31 via bearings, they slide along the guide rods 31, 31 in the same manner as the drive frame 33. Furthermore, between the drive frame 33 and the sliding body 35, four energy storage springs 37 are connected to the guide shaft 31, respectively.
31, and as shown in FIGS. 1 and 4, the inserted state is as shown in FIGS.
3 bearing 34 and flanges 36, 36 of sliding body 35
One end is screwed into the outer periphery of the bearing 34 and the other end is screwed into the outer periphery of the flanges 36, 36, respectively. Next, as shown in FIGS. 1 and 4, a pair of locking pieces 38 and 38' for locking the drive frame 33 at a predetermined movement position are pivotally attached to the support plate 29 of the machine frame 26a. , these locking pieces 38, 38' are approximately L-shaped, each having a locking pawl 39, 39 at one end and contact portions 40, 40 at the other end, and A tension spring 41 is stretched across the uppermost end opposite to the pivot portion. A release piece 42 is attached to the sliding body 35 in order to release the locking pieces 38, 38'. Further, on the lower side of the drive frame 33, shock absorbers 43 and 43' are mounted on the support plate 29 to cushion the drive frame 33 when it moves to a predetermined position.
The shock absorbers 43, 43' are provided by a case 44 mounted on the support plate 29, a buffer pin 45 that moves back and forth parallel to the drive frame 33, and a compression spring 46 inserted between the case 44 and the buffer pin 45. has been
Drive frame 33 and stopper 47, 4 attached to the bottom
7' as a buffer when the drive frame 33 moves in a predetermined direction.

Next, the operation section 27 will be explained. Figure 1,
As shown in FIG. 2, a drive shaft 8 is supported by a bearing sleeve 82, and its upper portion passes through the long hole 32 of the drive frame 33, passes through the sliding body 35, and is drivingly connected to an electric motor (not shown).
3, an eccentric disk 48 is fixed with its mounting position greatly eccentric, and this eccentric disk 48
Rotating members 49, 6 such as bearings are arranged around the periphery of the rotary member 49 and 6, which are in sliding contact with the eccentric disk 48 at an interval of approximately 180°.
0 is rotatably mounted on the sliding body 35, and furthermore, one long (second
As shown in FIG. 1, a horizontally long locking cam plate 50 whose other side is shortened (on the right side of the figure) can move together with the drive shaft 83 by fixing the middle part of the body integrally with the eccentric disk 48. installed on. In this embodiment, both ends of the locking cam plate 50 are formed in an arc shape, as shown in FIG.
As shown in FIG. 1, a first stopper seat 52a rotatably pivoted on a pedestal 51 planted on the drive frame 33 is provided on the long piece a side of the drive frame 33, as shown in FIG. When the locking cam plate 50 is moved by the required dimension in a predetermined direction, the protruding end of the long side a side of the locking cam plate 50 comes into contact with the stopper seat 52a, making it difficult for the drive frame 33 to lock in the predetermined position. In some cases, it plays a supporting role. In addition, on the opposite side of the drive split frame 33 provided with the first stopper seat 52a, a second stopper seat is provided at the same distance from the longitudinal center of the drive frame 33 as the first stopper seat 52a. 52b is rotatably mounted via a pedestal 51'.

Next, the drive unit 28 will be explained. As shown in FIG. 1, this drive unit 28 has a switching crank 54 integrally formed with a swing cam 53 at its upper part, which is rotatably attached to a bearing tube 82 via a bearing, and a lower part of the drive frame 33. As shown in FIGS. 1 and 4, a connecting tool 56 having a vertical hole 55 bored therein is attached, and a driving pin 57 fixed to the swing cam 53 is inserted into the vertical hole 55 of this connecting tool 56. This drives and connects the energy storage section 26 and the drive section 28. As shown in FIG. 4, engagement steps 58 and 59 are formed on the periphery of the swing cam 53 to engage with the engagement claws 39 of the engagement pieces 38 and 38'. ,38'
When the locking claw 39 of one of the locking pieces 38 is locked to the engagement step portion 58, the drive frame 33 is moved to the second position.
Right position of machine frame 26a shown in the figure (first operating position)
can be held accurately. Also, drive frame 3
3 to the left side as shown in Figure 7, and lock the locking piece 3.
When 8' is engaged with the other engagement step 59 of the swing cam 53, the drive frame 33 is accurately held at the second operating position on the left side of the machine frame 26a shown in FIG.
In these cases, the locking cam plate 50 disposed on the eccentric disc 48 has its long side a aligned with the first or second stopper seat 5 on the moving direction side of the drive frame 33.
2a, 52b, and lock and hold the drive frame 33 in a predetermined position together with the locking pieces 38, 38'. Next, the vacuum switch drive mechanism 65 will be explained. As shown in FIG.
7, and the driving cam body 66 has a cam groove 68 on its periphery, which is a combination of a horizontal part and an inclined part so that the movable electrodes 71 of the required number of vacuum switches 70 can be raised and lowered in a timely manner according to the switching sequence. is formed. Then, the cam groove 68
As shown in FIG. 1, the drive cam body 66 is rotatably attached to the bearing sleeve 82 via a bearing, and is integrally and drivingly connected to the switching crank 54. On the other hand, the opening/closing operation section 67 of the vacuum switch 70 has the same number of drive cam bodies as the vacuum switch 70.
They are arranged in a circle on the substrate 22 at equal intervals around the axis of the vacuum switch 70, and a lifting means (not shown) which is drivingly connected to the movable electrode 71 of the vacuum switch 70 is built in the case 67a. By engaging the driven pin 69 connected to the cam groove 68 of the drive cam body 66, the drive cam body 66 and the opening/closing operation section 67 are drivably connected.

Further, the vacuum switch 70 (not limited to this, other known switching contacts may be used) has a fixed electrode 72 in a container 73 with a high vacuum inside, and a vertically movable switch with respect to the container 73. The movable electrode 71 is arranged concentrically with the opening/closing operation section 67 via a mounting piece 76 to which a lead wire 75 is connected to an insulating plate 74 attached to the substrate 22 via a connecting member. It is set up.

Note that a conductive neutral point ring 84 is provided on the substrate 22.
is attached to the movable electrode 7 of each vacuum switch 70.
1 and is connected by a single lead set 85. Furthermore, the neutral point ring 84 has a connecting conductor 8
6, and the other end of this connecting conductor 86 is connected to a neutral point bushing of a transformer (not shown).

Next, the operation will be explained.

When the drive shaft 83 is rotated in the direction of the arrow in FIG.
The eccentric disk 48 and the locking cam plate 50, which are movably provided on the drive shaft 83, rotate in the same direction. The rotating member 4 is in sliding contact with the eccentric disk 48 due to its rotation.
9 is pushed as the eccentric disk 48 rotates, and the sliding body 35 is moved leftward in the second position, and is unevenly located with respect to the drive frame 33, as shown in FIG. When the sliding body 35 is moved as described above, as shown in FIG. 5, the energy storage spring 37 located on the advancing direction side of the sliding body 35 (left side in FIG. 5) is compressed, and conversely, the storage spring 37 located on the opposite side By enlarging the energy storage springs 37 located at (on the right side of FIG. 5), the respective energy storage springs 37,
The storage forces of the four storage springs 37 are stored. At this point, as shown in FIG. 5, the locking pawl 39 of the locking piece 38 is engaged and held by the engagement step 58 of the swing cam 53, so the drive frame 33 is As shown in FIG. 5, it is held at the original position (first operating position) of the machine frame 26a without moving. At this time, since the locking cam plate 50 is rotating, the locking with the first stopper seat 52a is released. From the above state, the eccentric disk 4
8 continues to rotate further, pushing the sliding body 35 to the left in FIG. When the locking claw 39 is moved, the locking claw 39 is disengaged from the engagement stepped portion 58 of the swing cam 53. When the locking piece 38 is released, the drive frame 33 is released from its lock, so that the force stored in the four energy storage springs 37 allows the machine frame 26a to be moved to its original position as shown in FIG. (right side) to Figure 7,
It rapidly moves to the left side of the machine frame 26a (second operating position) shown in FIG. With the rapid movement of the drive frame 33, the drive frame 33 and the switching crank 54
The driving pin 5 drivingly connects the swinging cam 53 of the
7 is forcibly moved within the vertical hole 55 of the connector 56, and rotates the swing cam 53 counterclockwise from the state shown in FIG. 5 to the position shown in FIG. 8. The rotation of the swing cam 53 is transmitted to the vacuum switch drive mechanism 65 as a driving force of the switching crank 54, which opens and closes the vacuum switch 70 to rapidly switch the switching switch 20.

On the other hand, when the drive frame 33 rapidly moves to the second operating position on the left side of the machine frame 26a, as shown in FIGS. 45, it is received as a buffer and stops. This prevents damage to the members constituting the drive section 28, such as the drive frame 33, the connector 56, and the drive pin 57. Then, as described above, when the drive frame 33 moves to the second operating position on the left side of the machine frame 26a shown in FIG. , the swing cam 5 of the switching crank 54
3 and holds the drive frame 33 in the second operating position shown in FIG. In addition, in this case, the locking cam plate 50 fixed on the sliding body 35 so as to be able to move together with the eccentric disk 48 has been rotated approximately 180 degrees from the position shown in FIG. 2, as shown by the solid line in FIG. In this state, it is locked to the second stopper seat 52b. As shown in FIG. 6, this locking cam plate 50 is on the verge of being released from the lock between the locking piece 38 and the swing cam 53 by the release piece 42, and the long piece a side is still close to the second stopper. It is located at a position where it does not come into contact with the seat 52b. However, when the locking piece 38 is released, the locking cam plate 50 is moved at the two points shown in FIG. It is provided so that it can be moved to the position indicated by the chain line by the rotation of the drive shaft 83, and the arc-shaped portion at the tip of the long side a can be locked with the second stopper seat 52b.
This locking cam plate 50 is moved by the movement of the drive frame 33.
At the time of being locked to the second stopper seat 52b,
As shown in FIGS. 7 and 8, the locking pawl 39 of the locking piece 38' engages with the engagement step 59 of the swing cam 53, and then the drive shaft 83 is rotated by the electric motor. Therefore, the locking cam plate 50 rotates to the solid line position in FIG. 7 and stops. As a result, the energy storage mechanism 2 of the present invention
In No. 5, the locking piece 38 is fixed by the locking cam plate 50.
can be reliably locked to the swing cam 53 to hold the drive frame 33 at a predetermined locking position.

Next, when the drive shaft 83 is rotated in the opposite direction, the eccentric disk 48 is rotated clockwise in FIG. 7, causing the locking cam plate 50 to rotate in the same direction and slide body 35 in the opposite direction to the above,
That is, it is moved to the right in FIG. In this case, the drive frame 33 is prevented from moving because the locking pawl 39 of the locking piece 38' is engaged with the engagement step 59 of the swing cam 53, so that the storage spring 37 is prevented from moving. You can measure your reserves. Thereafter, when the locking piece 38' is released from the locking piece 38' by the release piece 42 due to the movement of the sliding body 35, the drive frame 33 is moved by the stored force of the stored force spring 37 as shown in FIG. Machine frame 26a shown in
It rapidly moves from the left side position to the right side position of the machine frame 26a shown in FIG. 2, that is, from the second operating position to the first operating position. This movement rapidly rotates the switching crank 54 in the opposite direction, transmits the rotational force to the vacuum switch drive mechanism 65, and rapidly switches the switching switch 20.

Next, if the operation of the energy accumulating unit 26 and the driving unit 28 becomes slow for some reason while the energy accumulating mechanism 25 is in operation, for example, in the case of oil filling, sludge in the oil causes the drive frame 33 to be driven. When frictional resistance or the like increases at a portion, the drive frame 33 is forcibly moved in a predetermined direction by the stored force of the stored force spring 37. However, after the movement, the locking piece 38 or 3
8' to the engaging stepped portion 5 of the swing cam 53.
8 or 59, the movement speed slows down due to the frictional resistance just before the locking occurs, and the locking may not be possible. In such a case, in the present invention, the locking cam plate 50, as described above,
Just before the locking piece 38 or 38' locks,
Either the first or second stopper seat 52a,
52b, so that even if the stop piece cannot be engaged with the engagement step of the swing cam, the lock cam plate 50 can The drive shaft 83 allows the normal stop position (second
It can be moved to the position shown by the solid line in FIG. As a result,
As the locking cam plate 50 continues to rotate, the tip of the long side a is moved to the first or second stopper seat 52a,
52b and pushes it. That is, since the drive frame 33 can be moved to a predetermined position, the locking piece 38 or 38' engages the swing cam 53 rotating via the drive pin 57 by the movement of the drive frame 33. The drive frame 33 can be held at a predetermined moving position by reliably engaging with the portion 58 or 59. This makes it possible to perform the next switching operation of the switching switch smoothly and reliably.

〔Effect of the invention〕

As explained above, in the present invention, a horizontally elongated locking cam plate is attached to the upper surface of the eccentric disk directly connected to the drive shaft, and the locking cam plate is mounted on both sides of the locking cam plate in the length direction on the drive frame. A pair of stopper seats that come into contact with a locking cam plate when the drive frame moves to a fixed position are arranged so as to be able to come into contact with and separate from the locking cam plate, and the drive frame is moved to the fixed position by the stored force of a storage spring. The heat storage mechanism is constructed so that the locking piece locks with the swinging cam of the switching crank, and the locking cam plate is brought into contact with the stopper seat and held in a predetermined position. Therefore, even if a situation arises in which the locking piece cannot lock with the swing cam after the drive frame has moved, the locking cam plate is rotated by the drive shaft using the drive of the electric motor, and the stopper seat is moved. The locking piece can be reliably locked to the swing cam by slightly moving the drive frame in the direction of movement of the drive frame.
Moreover, as mentioned above, the drive frame can be reliably locked and held in the position after the movement, so if the drive frame is not properly locked, the energy storage mechanism may not operate normally when the switching switch is switched. First, this can reliably prevent burning out of the current limiting resistor and occurrence of power outage accidents. As a result, it is possible to provide an energy storage mechanism for a tap switching device under load, which improves the reliability of the switching switch and extends its electrical and mechanical life.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a switch for an on-load tap switching device equipped with the storage mechanism of the present invention, FIG. 2 is a plan view, and FIG. 3 is a cross-sectional view taken along line A-A in FIG. 1.
Figure 4 is a sectional view taken along line B-B, Figures 5 and 6 are cross-sectional views and plan views of main parts showing the energy storage state of the energy storage spring, and Figures 7 and 8 are the energy storage springs. Fig. 9 is a plan view and a cross-sectional view of the main parts showing the state after the drive frame has moved rapidly due to the storage force of the conventional power storage mechanism. It is a front view. 33... Drive frame, 37... Energy storage spring, 48...
Eccentric disk, 50... Locking cam plate, 52a, 52b
...Stopper seat, 83...Drive shaft.

Claims (1)

[Claims] 1. A drive shaft is directly connected to an eccentric disc, and this eccentric disc is rotatably mounted on a drive frame which has a built-in energy storage spring capable of storing energy and is slidably attached to a guide shaft, Furthermore, a horizontally elongated locking cam plate that rotates together with the eccentric disk is installed on the eccentric disk, and the locking cam plate contacts and separates from the locking cam plate on the extension line in the length direction of the locking cam plate. A pair of stopper seats are disposed on the drive frame, and when the drive frame is moved to a predetermined position by the stored force of a storage spring, the locking cam plate comes into contact with the corresponding stopper seat to fix the drive body. A power storage mechanism for a tap switching device under load, characterized in that it is locked and held in position.