JP6826497B2 - Vibration suppression device for pantograph type disconnector - Google Patents

Description

The present invention relates to a vibration suppression device for a pantograph type disconnector.

FIG. 1 shows an example of a conventional pantograph type disconnector 1'. The pantograph-type disconnector 1'has a configuration in which a pantograph-type conductive portion 2 is installed on the top of a pedestal device 4 standing on a gantry 3 installed on the ground. The conductive portion 2 includes a link mechanism in which a plurality of arms 5 are connected by a pin structure 6. By the operation of the link mechanism, the tip 2a of the conductive portion 2 moves up and down. When the arm 5 is extended and the tip 2a is in the upper position as shown in the figure, the pair of tips 2a come into contact with each other with the fixed contact portion 7a of the bus 7 arranged above sandwiched between them to conduct conduction. Although not shown, when the arm 5 is folded and the tip 2a is in the lower position, the pair of tips 2a are in an open state, separated from the fixed contact portion 7a, and become non-conducting.

The insulator device 4 includes three support insulators 10 that support the conductive portion 2 and an operation insulator 11 that transmits a rotational force for opening and closing the conductive portion 2 of the link mechanism. The three support insulators 10 are arranged on each side of the triangular pyramid having the adjustment plate 12 as the base, which is arranged on the upper surface of the gantry 3 via the adjustment stud 15, and the upper end of the support insulator 10 is attached to the power transmission box 14. connect. Each support insulator 10 connects a plurality of insulators 10a in series, and the connecting portion is firmly formed by, for example, bolts and nuts. As a result, each of the support insulators 10 becomes like a rod. Further, the operation wheel 11 connects a plurality of wheel 11a in series and stands upright on the gantry 3. The swords 11a are firmly connected to each other by, for example, bolting. As a result, the operation wheel 11 becomes like a single rod.

The upper end of the operation wheel 11 is rotatably supported by a bearing with respect to the shaft support 9, and the upper end thereof is connected to a power transmission box 14 installed on the upper surface side of the shaft support 9. The transmission mechanism mounted in the power transmission box 14 converts the rotation of the vertically standing operation wheel 11 around the axis into a rotation around a predetermined horizontal axis, that is, a rotation in a vertical plane. The output shaft 14b of the transmission mechanism is arranged on one side surface 14a of the power transmission box 14. The lower end of the arm 5 constituting the conductive portion 2 is arranged and connected to the output shaft 14b. As a result, when the operation wheel 11 rotates forward and reverse, the output shaft 14b rotates forward and reverse, and the lowermost arm 5 rotates forward and reverse with the lower end of the arm 5 as the center of rotation. As described above, the tip 2a of the conductive portion 2 moves up and down due to the operation of the link mechanism accompanying the forward and reverse rotation of the lowermost arm 5.

As shown enlarged in FIG. 2, in the adjusting stud 15, stud bolts 17 having male threads at both ends are arranged so as to penetrate the adjusting plate 12 and the top plate 13 of the gantry 3, and the stud bolts 17 are both ends. The adjusting plate 12 and the top plate 13 are sandwiched and fixed from above and below by the plurality of attached nuts 18, respectively. By appropriately positioning the nut 18 with respect to the stud bolt 17, the adjusting plate 12 is positioned at a desired height while being horizontal. The adjusting stud 15 has a rigid structure in which the top plate 13 and the adjusting plate 12 are directly connected by stud bolts 17 and nuts 18 and are firmly fixed and do not move.

In the conventional pantograph type disconnector 1'described above, the adjusting stud 15 and the insulator device 4 both have a strong structure. Then, for example, when an earthquake motion occurs, the conductive portion 2 tries to move in the direction of shaking, but the top displacement is suppressed by the adjusting stud 15 and the support insulator 10 of the insulator 4 having the triangular pyramid reinforcement structure, and the conductive portion 2 Suppress movement. However, if a large seismic motion that exceeds the design reference waveform of the insulator 4 occurs, for example, a large bending stress is applied near the top of the insulator 4, and if the allowable bending stress of the insulator is exceeded, the insulator may be damaged. is there. Therefore, in order to prevent damage to the insulator against such earthquake motion, for example, an impact shock absorber for a disconnector disclosed in Patent Document 1 has been developed, and the shock shock absorber is attached to a connecting portion of an insulator connected in series. There is something to place.

JP 2014-120276

Conventional seismic countermeasure techniques for disconnectors have been developed exclusively for the purpose of preventing damage to insulators. Therefore, the pantograph disconnector targeted by the present invention cannot adopt a sufficient seismic structure against, for example, a large seismic motion exceeding the scale conventionally assumed. That is, in the case of a pantograph type disconnector, especially in the conductive portion 2 in the closed state as shown in FIG. 1, the arm 5 is in an extended posture, and in that state, a vibration such as a large earthquake exceeding the conventional design standard of the insulator device occurs. When it occurs, a large moment is generated, which causes damage to the conductive portion 2 and the insulator device 4. In particular, breakage is seen in the portion of the pin structure 6 and in the vicinity of the upper end of the support insulator 10. Conventional seismic techniques cannot be adequately applied to the pantograph disconnector 1'.

In order to solve the above-mentioned problems, the present invention relates to (1) a pantograph-type conductive portion, an insulator device that supports the conductive portion, and three adjusting studs that adjust the position of the insulator device in the height direction. The upper ends of the three adjustment studs are vibration suppression devices in a pantograph type disconnector attached to an adjustment plate to which the lower ends of the insulator devices are connected, respectively, and are attached to each of the three adjustment studs. , Equipped with a seismic isolation device that damps vibrations.

For example, the pantograph-type conductive portion is in a vertically extended posture in the state of being turned on, and a large moment is generated when a vibration such as an earthquake occurs in that state. In the present invention, for example, vibration at the time of an earthquake can be damped by a seismic damping device to prevent the conductive portion from being significantly displaced. Therefore, even if there is a large seismic motion, it is possible to suppress contact with a nearby member due to damage to the conductive portion or the insulator device or a large displacement. In particular, since the damping device is placed on each of the three adjustment studs placed at the apex of the virtual triangle, at least one damping device works regardless of the horizontal vibration direction of the seismic motion. Vibration can be damped.

(2) The vibration damping device includes a ring spring to be attached to a stud bolt constituting the adjusting stud, and the ring spring is arranged below the adjusting plate and is located below the wheel spring of the stud bolt. It is preferable to apply the initial load to the ring spring by adjusting the distance between the set of fixing nuts mounted on the upper side of the adjusting plate. A ring spring has a larger damping constant than other springs, can be damped even with a large vibration, and can be damped in a short time, so that it is good because the shaking can be suppressed even in the event of a large earthquake, for example.

(3) The vibration damping device may include a disc spring to be attached to a stud bolt constituting the adjusting stud. By changing the number of disc springs, the load can be easily adjusted and a desired damping effect can be obtained. Furthermore, when a plurality of disc springs are stacked, the load increases accordingly as the number of disc springs increases. For example, the disc springs do not elastically deform due to small vibrations, and a rigid rod integrated with the stud bolt. Is equivalent to. Then, as in the case of the conventional rigid structure directly connected to the stud bolt, the rigidity can suppress the shaking of the insulator device and the conductive portion placed on the adjusting plate and the conductive portion, and prevent the damage. Then, when a large vibration exceeding the conventional design standard such as a large earthquake occurs, the disc spring elastically deforms to dampen the vibration and suppress damage to the shaving device and the conductive portion.

(4) The seismic isolation device includes a ring spring to be attached to the stud bolt constituting the adjustment stud and a disc spring, and is configured so that an initial load can be applied to the ring spring by the elastic restoring force of the disc spring. Good. In this way, the disc spring exerts a function of applying an initial load to the ring spring in addition to the vibration damping function of the disc spring itself. Therefore, for example, even when the initial load of the ring spring alone is lost and it cannot be appropriately damped due to a larger earthquake or the like, the initial load can be firmly applied by the disc spring. As a result, even if there is such a big earthquake or the like, the vibration is surely attenuated and the insulator and the conductive part are prevented from being damaged.

(5) In addition to the seismic damping device attached to the three adjusting studs, a disc spring type seismic damping device may be provided in parallel. This disc spring type seismic isolation device corresponds to the second seismic isolation device 40 in the embodiment. When the damping function of the seismic isolation device attached to each of the three adjustment studs is enhanced, the size of the device also increases accordingly. Then, for example, when trying to mount it on the adjustment stud part of the existing pantograph type disconnector, there is a risk that the adjacent vibration damping devices will interfere with each other due to their large diameter, or they will become too long to be mounted on the stud bolt. is there. In the present invention, even if a seismic damping device that can be attached to the adjustment stud portion of an existing or other conventional pantograph type disconnector cannot exert a sufficient damping effect, the damping effect of the disc spring type seismic damping device arranged in parallel can be obtained. In addition, vibration can be reliably damped, and damage to the struggle device and conductive parts can be suppressed even in the event of a large earthquake. Furthermore, the size of the diameter of the disc spring is determined by the standard, and the ability to damp is determined by the number of disc springs, so that the disc spring can be mounted without interference. In particular, if the disc spring is arranged on the adjusting plate, it can be mounted more reliably and easily.

In the present invention, for example, even if there is a large earthquake motion, it is possible to prevent the conductive portion and the insulator from being damaged.

It is a figure which shows the conventional example. It is a figure which shows the conventional example. It is a front view which shows one form of the vibration suppression apparatus of the pantograph type disconnector to which this invention is implemented. It is the side view. (A) is a plan view which shows the part of the adjustment plate, and (b) is a figure which shows the adjustment stud and its periphery. It is sectional drawing which shows one Embodiment of the vibration suppression apparatus. It is a figure explaining the action. (A) is a plan view which shows the part of the adjustment plate in another embodiment of a vibration suppression apparatus, and (b) is a figure which shows the adjustment stud and its periphery. It is sectional drawing which shows. It is an enlarged view which shows the 2nd seismic isolation device 40. It is a figure explaining the seismic resistance test. It is a figure which shows the test result.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not construed as being limited to this, and various changes, modifications, and improvements can be made based on the knowledge of those skilled in the art without departing from the scope of the present invention.

3 and 4 show a preferred embodiment of the vibration suppression device according to the present invention and a pantograph disconnector 1 to which the vibration suppressor 1 is applied. The pantograph type disconnector 1 includes the same configuration as the conventional one described with reference to FIGS. 1 and 2, and the corresponding members will be described with the same reference numerals.

As shown in FIGS. 3 and 4, the pantograph-type disconnector 1 is installed on the ground with a pantograph-type conductive portion 2 that contacts / separates from the bus 7, an insulator 4 that supports the conductive portion 2. An adjusting stud 15 is provided between the gantry 3 and the gantry 3 and the insulator device 4 for adjusting the height position and posture of the insulator device 4.

The conductive portion 2 includes a link mechanism in which a plurality of arms 5 are connected by a pin structure 6. In this embodiment, the upper end of the lower first arm 5a and the lower end of the upper first arm 5b are rotatably connected by a pin structure 6, and the upper end of the lower second arm 5c and the lower end of the upper second arm 5d are connected by a pin structure. 6 is rotatably connected, and the intermediate portion of the upper first arm 5b and the intermediate portion of the upper second arm 5d are rotatably connected by the pin structure 6. Then, the lower portions of the lower first arm 5a and the lower second arm 5c are arranged along the side surface 14a of the power transmission box 14, and the lower end of the lower first arm 5a and the lower second arm 5c. The lower ends of the power transmission box 14 are connected to the output shaft 14b of the power transmission box 14, respectively. When the output shaft 14b rotates in the forward and reverse directions, the tip 2a of the conductive portion 2 (the upper end of the upper first arm 5b and the upper second arm 5d) moves up and down due to the operation of the link mechanism. When the upper end of the upper first arm 5b and the upper end of the upper second arm 5d forming the tip 2a of the conductive portion 2 are located at the upper positions as shown in the drawing, they approach each other to form the fixed contact portion 7a of the bus 7. Contact and conduct while sandwiched from both sides. Although not shown, when the tip 2a is in the lower position, the upper end of the upper first arm 5b and the upper end of the upper second arm 5d, which are a pair of tips 2a, are in an open state and separated from the fixed contact portion 7a. However, it becomes non-conducting.

Further, although not shown, the lower part of the arm 5 is electrically connected to another bus, and in the illustrated state, the other bus and the bus 7 are electrically connected to each other. Then, when the tip 2a of the conductive portion 2 comes to a lower position and separates from the bus 7, the path from the bus 7 to the bus (not shown) is blocked.

The insulator device 4 includes three support insulators 10 that support the conductive portion 2 and an operation insulator 11 that transmits a rotational force for opening and closing the conductive portion 2 of the link mechanism. The three support insulators 10 are arranged on each side of a triangular pyramid having an adjustment plate 12 as a base, which is arranged on the upper surface of the gantry 3 via an adjustment stud 15, and the upper end of the support insulator 10 is attached to a power transmission box 14. connect. Each support insulator 10 connects a plurality of insulators 10a in series, and the connecting portion is firmly formed by, for example, bolts and nuts. As a result, each of the support insulators 10 becomes like a rod. As shown in FIG. 5, the adjusting plate 12 is composed of a substantially equilateral triangular flat plate whose apex is rounded, and the lower ends of the three support insulators 10 are connected to each other near the apex of the equilateral triangle.

Further, the operation wheel 11 connects a plurality of wheel 11a in series and stands upright on the gantry 3. The swords 11a are firmly connected to each other by, for example, bolting. As a result, the operation wheel 11 becomes like a single rod. The upper end of the operation wheel 11 is rotatably supported by a bearing with respect to the shaft support 9, and the upper end thereof is linked to a power transmission box 14 installed on the upper surface side of the shaft support 9.

The transmission mechanism mounted in the power transmission box 14 converts the rotation of the vertically standing operation wheel 11 around the axis into the rotation of the output shaft 14b horizontally projected from the side surface 14a to the outside. .. As a result, when the operation wheel 11 rotates forward and reverse, the output shaft 14b rotates forward and reverse, and the posture of the arm 5 changes.

An operation device 20 is provided below the outer surface of the gantry 3. The operation device 20 includes a drive source such as a battery and a drive motor, an operation switch for controlling the drive, and the like. The rotational output of the drive source is transmitted to the operation wheel 11 via the power transmission mechanism 21. The operation wheel 11 receives the rotation output and rotates in the forward and reverse directions.

Three adjusting studs 15 for connecting the top plate 13 of the gantry 3 and the adjusting plate 12 are provided. Each adjusting stud 15 is arranged vertically on the top plate 13 so as to be connected to the inside of the connecting portion of the support insulator 10 of the adjusting plate 12 (center side of the adjusting plate 12).

These basic configurations are the same as those of the general pantograph type disconnector 1. Then, in the present embodiment, in the vibration suppression device, the vibration damping device 25 is arranged on each of the three adjusting studs 15. As shown in an enlarged manner in FIGS. 5 and 6, the through holes 13a provided in the top plate 13 of the gantry 3 and the through holes 12a provided in the adjusting plate 12 are arranged so as to coincide with each other in the vertical direction, and both of them are penetrated. The stud bolt 17 is arranged so as to penetrate the holes 13a and 12a. The inner diameters of the through holes 13a and 12a are larger than the outer diameter of the stud bolt 17, and are in a so-called stupid hole state. The stud bolt 17 of the present embodiment has a male screw formed over the entire length. A set of lower fixing nuts 22 is attached to the male screw portion on the side of the stud bolt 17 mounted on the top plate 13, and the top plate 13 is sandwiched from above and below by the set of lower fixing nuts 22. .. As a result, the stud bolt 17 is fixed to the top plate 13 and the stud bolt 17 is held upright in the vertical direction.

On the other hand, a set of upper fixing nuts 23 is attached to the male screw portion on the side attached to the adjusting plate 12 of the stud bolt 17. The set of upper fixing nuts 23 is arranged on both the upper and lower sides of the adjusting plate 12, but the seismic damping device 25 is arranged between the set of upper fixing nuts 23 instead of directly sandwiching the adjusting plate 12. The seismic isolation device 25 of the present embodiment includes a disc spring 27 and a ring spring type seismic isolation device 30.

More specifically, the disc spring 27 is arranged on the upper surface side of the adjusting plate 12, and the stud bolt 17 penetrates through the through hole 27a in the center of the disc spring 27. Then, by tightening the upper fixing nut 23 arranged on the upper side of the adjusting plate 12, the disc spring 27 is sandwiched between the upper fixing nut 23 and the adjusting plate 12. In the present embodiment, the two disc springs 27 are arranged in a stacked state.

On the other hand, a ring spring type vibration damping device 30 is arranged between the upper fixing nut 23 arranged below the adjusting plate 12 and the adjusting plate 12. The ring spring type vibration damping device 30 includes a ring spring 31, a bottomed shaft 32 for accommodating the ring spring 31, and a guide cap 35. The inner diameter of the inner ring 31a of the ring spring 31 is set to be one size larger than the outer diameter of the stud bolt 17.

The shaft 32 includes a cylindrical guide shaft 32a that opens vertically and a bottom portion 32b that closes below the guide shaft 32a, and makes the outer diameter of the guide shaft 32a equal to the outer diameter of the bottom portion 32b. Then, with the lower end of the guide shaft 32a fitted into the bottom portion 32b, both are fastened with the fixing bolts 32c. The inner diameter of the guide shaft 32a is one size larger than the outer diameter of the outer ring 31b of the ring spring 31. The internal space of the shaft 32 serves as a storage space for the ring spring 31.

Further, the total length of the guide shaft 32a is shorter than the total length of the ring spring 31, and when the ring spring 31 is housed in the shaft 32, the upper part of the ring spring 31 protrudes upward from the shaft 32. At the center of the bottom portion 32b, there is a through hole 32d that penetrates vertically. The inner diameter of the through hole 32d is larger than the outer diameter of the stud bolt 17.

The upper portion of the shaft 32 is in a state of being inserted into the guide cap 35 having a lower opening. The guide cap 35 includes an outer cylinder portion 35a and a top surface portion 35b that closes above the outer cylinder portion 35a. The inner diameter of the outer cylinder portion 35a is substantially equal to the outer diameter of the guide shaft 32a. With the outer peripheral surface of the guide shaft 32a and the inner peripheral surface of the guide cap 35 rubbing against each other, both can move relatively in the vertical direction. Further, the upper end of the ring spring 31 comes into contact with the inner surface of the top surface portion 35b of the guide cap 35. For example, when an upward urging force is applied to the shaft 32, the shaft 32 urges the ring spring 31 upward and moves upward while compressing and deforming the ring spring 31. Further, when the urging force applied to the shaft 32 is released, the shaft 32 moves downward due to the elastic restoring force of the ring spring 31 and returns to the original position. When a downward urging force is applied to the guide cap 35, the guide cap 35 urges the ring spring 31 downward and moves downward while compressing and deforming the ring spring 31. Then, when the urging force applied to the guide cap 35 is released, the guide cap 35 moves up and returns to the original position due to the elastic restoration force of the ring spring 31.

Further, in the present embodiment, a through hole 35c that penetrates vertically is formed in the center of the top surface portion 35b of the guide cap 35. The inner diameter of the through hole 35c is one size larger than the outer diameter of the stud bolt 17.

Then, the stud bolt 17 is inserted so as to penetrate the through hole 32d of the shaft 32 and the through hole 35c of the guide cap 35. The tip of the stud bolt 17 protruding from above the guide cap 35 penetrates the adjusting plate 12 and the disc spring 27, and the upper fixing nut 23 is fastened. Further, by tightening the upper fixing nut 23 attached to the male screw portion of the shaft 32 protruding downward from the through hole 32d of the shaft 32, the upper fixing nut 23 comes into contact with the bottom portion 32b of the shaft 32.

Further, a positioning member 35d is provided at the center of the upper surface of the guide cap 35. There is also a through hole in the center of the positioning member 35d, and the stud bolt 17 passes through the through hole and projects out of the guide cap 35.

A recess 12b is formed on the peripheral edge of the through hole 12a on the lower surface of the adjusting plate 12 that comes into contact with the positioning member 35d. The positioning member 35d of the guide cap 35 is aligned and positioned in the recess 12b. The inner surface shape of the recess 12b and the outer surface shape of the positioning member 35d are curved surfaces. As a result, for example, when the angle formed by the stud bolt 17 and the adjusting plate 12 is about to change from the orthogonal state, it is guided by the curved surface and smoothly performed.

In the above configuration, by adjusting the distance between the pair of upper fixing nuts 23, the ring spring 31 is put into a compressed state and an initial load is applied to the ring spring 31. By applying the initial load in this way, even if the pantograph type disconnector 1 shakes due to, for example, an earthquake, the vibration can be damped by the ring spring 31. Therefore, for example, even if the vibration of the arm 5 constituting the conductive portion 2 in the pantograph type disconnector 1'in which the conventional seismic isolation device 25 is not arranged has a large seismic motion exceeding the permissible, the seismic isolation device 25 It absorbs vibration and suppresses vibration within the permissible range, and prevents damage to the arm 5 and the disconnecting device 4.

That is, as shown in FIG. 7A, in the conventional structure in which the adjusting stud 15 is directly connected to the stud bolt 17, the rigidity from the gantry 3 to the adjusting plate 12 is high, and the adjusting stud 15 is connected to the pantograph-shaped conductive portion 2. Since the natural period is also different, for example, when horizontal vibration due to seismic motion occurs, the partial scraping device 4 from the gantry 3 to the adjusting plate 12 and the conductive portion 2 side above the gantry 3 do not shake together. In particular, when the conductive portion 2 is in the charged state, the arm 5 extends upward, so that the swing moment of the conductive portion 2 due to the horizontal vibration also increases, and the displacement amount of the top portion increases. As a result, the conductive portion 2 and the insulator device 4 are damaged.

On the other hand, since the seismic isolation device 25 is arranged in the portion of the adjustment stud 15 as in the present embodiment, as shown in FIGS. 7 (b) and 7 (c), when horizontal vibration due to the seismic motion occurs, the ring spring By elastically deforming the 31 and the disc spring 27, the adjusting plate 12 can be displaced so as to be tilted, the vibration can be damped, and the conductive portion 2 can be suppressed from being largely displaced. Therefore, even if there is a large seismic motion, it is possible to reduce the vibration, suppress the shaking of the conductive portion 2, and prevent the conductive portion 2 and the insulator 4 from coming into contact with nearby members due to damage or large displacement.

In particular, in the present embodiment, since the damping device 25 is arranged on each of the three adjusting studs 15 arranged at the apex of the virtual triangle, at least one vibration damping device 25 is arranged regardless of the horizontal vibration direction of the seismic motion. The ring spring 31 and the disc spring 27 of the seismic isolation device 25 are good because they can be compressed and deformed to be damped.

Further, when a large earthquake exceeding the conventional design standard occurs, for example, the inclination of the adjusting plate 12 becomes large, the ring spring 31 is fully extended, and the initial load is lost, the vibration suppression effect is lost. However, in the present embodiment, since the disc spring 27 is provided, the disc spring 27 pushes the ring spring 31 to stretch, and the initial load may always be applied. That is, the disc spring 27 of the present embodiment has a function of applying an initial load to the ring spring 31 in addition to the function of damping the vibration by the spring. As described above, in the present embodiment, since the disc spring 27 is configured to apply the initial load to the ring spring 31, the initial load applied by adjusting the position of the nut may be small.

In the above-described embodiment, for example, the existing stud bolt 17 can be configured by tightening a nut with a disc spring 27 or a ring spring type vibration damping device 30 attached. Therefore, the existing pantograph type disconnector can be easily improved to the product of the present invention in which seismic measures are taken.

In the above-described embodiment, an example in which two disc springs 27 are used has been described, but the present invention is not limited to this, and one or three or more disc springs may be used. Further, in the embodiment, the seismic isolation device 25 is configured by using the disc spring 27 and the ring spring 31, but the present invention is not limited to this, and only one of the disc spring 27 and the ring spring 31 may be used. ..

FIG. 8 shows yet another embodiment. In this embodiment, the second seismic isolation device 40 is provided on the premise of the above-described embodiment. The second seismic isolation device 40 is arranged between each of the three stud bolts 17 equipped with the seismic isolation device 25, and a total of three are provided. The second seismic isolation device 40 is configured by using a disc spring 27. A specific configuration uses a set of lower fixing nuts 42 below the stud bolts 41 arranged so as to penetrate the through holes 12c of the adjusting plate 12 and the through holes 13b of the top plate 13 of the gantry 3. And fix it to the top plate 13. Then, above the stud bolt 41, the disc springs 27 arranged on both the upper and lower sides of the adjusting plate 12 are arranged so as to penetrate, and in that state, the upper and lower disc springs 27 and the adjusting plate are provided with a set of upper fixing nuts 43. 12 is sandwiched and the disc spring 48 is fixed in a desired compressed state.

As a result, the disc spring 48 is elastically deformed, and the vibration can be damped by the damping function of the disc spring 48. Further, the disc spring 27 arranged on the upper surface side of the adjusting plate 12 urges the adjusting plate 12 downward and applies an initial load to the ring spring 31. The ring spring 31 can obtain a desired load, for example, by increasing the diameter or increasing the length in the axial direction. However, as the diameter and / or length increases, it cannot be placed in the space within the existing adjustment stud 15. Therefore, in the present embodiment, when the vibration damping device 25 cannot sufficiently suppress the vibration (the target load cannot be obtained by the ring spring), the target load is also taken into consideration by the second vibration damping device 40 using the disc spring. To get. As a result, the vibration damping device 30 provided with the ring spring 31 and the disc spring 27 and the second vibration damping device 40 equipped with the disc spring 48 exert a damping function in parallel, thereby synergistically suppressing vibration. it can.

In the present embodiment, three disc springs 27 are arranged one above the other, but the present invention is not limited to this, and one or three or more disc springs 27 may be used. Further, the position of the disc spring 27 may be one side, for example, only on the upper side.

* Experimental results In order to confirm the effects of the above-mentioned embodiments and modifications, the seismic tests shown below were conducted. As shown in FIG. 10, the conductive portion 2 was subjected to a tension unloading test on the one in which the arm 5 was in the extended state. Such a test was carried out on a conventional one in which a seismic damping device was mounted on the adjusting stud 15 and a conventional one in which the adjusting stud 15 was directly connected without mounting the seismic damping device.

In the tension unloading test, tension is applied in a certain direction and then the tension is unloaded. Then, after unloading, the response at each measurement point until the vibration stops is measured. To load the tension, as shown in FIG. 10, one end of the bind wire 50 is connected to the power transmission box 14, and the other end is connected to the chain block 52. After crawling one end side of the bind wire 50 so as to extend in the horizontal direction, the pulley 51 crawls so as to face downward. The chain block 52 is linked to the load meter 53. The chain block 52 is operated while checking the tension with the load meter 53, and the power transmission box 14 is pulled. Then, when a predetermined load is reached, the bind wire 50 is cut, and the free vibration accompanying the cutting is used for evaluation. The unloading was changed to 50, 100, 200, 300, 400, 500, ... [kgf], and each was examined.

When the strain distribution at each point of the arm 5 and the pin structure 6 of the conductive portion 2 and each point of the support insulator 10 was measured, the amount of strain increases as the deloading increases at any point. The strain of the product corresponding to the product of the present invention equipped with the seismic damping device (belleville spring type) was smaller than that of the conventional structure without the seismic damping device.

FIG. 11 shows an example of a waveform until the vibration converges due to free vibration. FIG. 11 (a) shows a conventional rigid structure without a seismic isolation device, and FIG. 11 (b) shows a disc spring (two) structure seismic isolation device mounted. FIG. 11 (c) ) Is a vibration damping device with a ring spring structure. The damping constants were 3 to 4% for the rigid structure, 7 to 9% for the disc spring structure, and 12 to 15% for the ring spring structure. From these, it was confirmed that the vibration converges faster in the one equipped with the seismic isolation device than in the one with the conventional structure. It was also confirmed that the ring spring structure is more damped than the disc spring structure.

1 Pantograph type breaker 2 Conductive part 3 Mount 4 Gable device 12 Adjusting plate 13 Top plate 15 Adjusting stud 17 Stud bolt 25 Seismic damping device 27 Belleville spring 30 Wheel spring type seismic damping device 31 Ring spring 40 Second seismic damping device 41 Stud bolt 48 Belleville spring

Claims (5)

A pantograph-type conductive portion, an insulator device for supporting the conductive portion, and three adjusting studs for adjusting the position of the insulator in the height direction are provided, and the upper ends of the three adjusting studs are each described above. It is a vibration suppression device in a pantograph type disconnector attached to an adjustment plate to which the lower end of the insulator device is connected.
A vibration suppression device for a pantograph type disconnector, characterized in that a vibration damping device for damping vibration is attached to each of the three adjustment studs. The seismic isolation device includes a ring spring that is attached to a stud bolt that constitutes the adjustment stud.
The ring spring is arranged below the adjusting plate and
A claim characterized in that an initial load is applied to the ring spring by adjusting the distance between a set of fixing nuts mounted on the lower side of the ring spring of the stud bolt and the upper side of the adjusting plate. Item 4. The vibration suppression device for the pantograph type disconnector according to item 1. The vibration suppression device for a pantograph disconnector according to claim 1, wherein the vibration damping device includes a disc spring to be attached to a stud bolt constituting the adjusting stud. The seismic isolation device includes a ring spring and a disc spring that are attached to the stud bolts constituting the adjustment stud.
The vibration suppression device for a pantograph-type breaker according to claim 1, wherein an initial load is applied to the ring spring by the elastic restoring force of the disc spring. The pantograph-type disconnector according to any one of claims 1 to 4, wherein a disc spring type vibration damping device is provided in parallel in addition to the vibration damping device mounted on the three adjusting studs. Vibration suppression device for the vessel.

Images