WO2020095703A1 - Protective tube insertion tool - Google Patents

Abstract

Provided is a protective tube insertion tool with which slips due to raindrops, etc. do not easily occur even if a simple configuration is used. A protective tube insertion tool 1 is fixed to an overhead electric wire 100 by an electric wire gripping part 2 that grips from two directions. A substantially triangular interrupt plate 4 is formed integrally on one gripping piece 2b of a pair of gripping pieces 2a, 2b that constitute the electric wire gripping part 2. A guide rail 6 that guides a protective tube 101 is disposed along a lower edge 4a of the interrupt plate 4. A rubber roller 8, which conveys the protective tube 101 by a rotational force input from the outside via a connection part 12, has a hollow structure, and is in a largely deformed state due to being constantly pressed by the guide rail 6.

Description

Protective tube inserter

The present invention relates to a protective tube inserter for inserting or withdrawing a protective tube that covers an overhead wire installed on a utility pole or the like.

Protective tubes are used to protect overhead cables from damage caused by contact with trees. In addition, when working near an overhead wire, a protective tube is also used to prevent a worker or working equipment from touching the wire.

FIG. 10 is a perspective view of the protection tube 101 connected.

The main body portion 102 constituting the protection tube 101 shown in FIG. 10, the female fitting portion 103 formed on one end side of the main body portion 102 and the male fitting portion 104 formed on the other end side are An insulating material having elasticity and flexibility is used. As shown by the phantom lines, these have an inner diameter capable of accommodating the overhead wire 100 inside, and a slit-shaped opening 107 is formed above the main body 102 in a straight line in the longitudinal direction. With such a material / shape, the overhead wire 100 can be covered by opening the opening 107 to accommodate the overhead wire 100 inside and letting the restoring force based on the elasticity of the protection tube 101 close to close the overhead wire 100. A pair of fins 109 extending in parallel to the diameter-expanding side of the cylinder are formed from opposite end edges forming the opening 107, respectively.

Further, as shown in FIG. 10, a male fitting portion 104 is formed at one end in the longitudinal direction of the protective pipe 101, and another protective pipe 101 having the male fitting portion 104 at the other end is formed. A female fitting portion 103 that can be connected to is formed. The protection tubes 101 connected to each other are each set to a predetermined length, and a plurality of male and female fitting portions 103 and 104 are added to each other to cover a long overhead wire 100.

Here, the male fitting portion 104 has a larger outer diameter than the main body portion 102. Further, the female fitting portion 103 is formed with a housing portion 106 capable of housing the male fitting portion 104 at the time of fitting and capable of being internally coupled. Therefore, the housing portion 106 of the female fitting portion 103 has a larger outer diameter than the male fitting portion 104.

Generally, when attaching the protection tube 101 as described above to the overhead wire 100, first insert the first protection tube 101 into the overhead wire 100, and then, attach the tip of the second protection tube 101 to the overhead wire 100. After being inserted and inserted into the overhead electric wire 100, these two protective tubes 101 are connected to each other through male and female fitting portions 103 and 104. Then, by repeating such work, a plurality of protective tubes 101 are inserted into the overhead wire 100.

Next, a device for inserting the protective tube 101 as described above into the overhead wire 100 will be described.

FIG. 11 is a side view of the conventional tube inserter 110. The tube inserter 110 is fixed to the overhead wire 100 so as to be sandwiched by an upper wire holding angle 111 and a guide body 112. The protection tube 101 passed along the guide rod 113 extending from the guide body 112 passes between the guide body 112 and the drive tire 116 into which compressed air is press-fitted. Then, the protective pipe 101 that has moved further is guided to the overhead wire 100 with the opening 107 (see FIG. 10) expanded by the pipe expanding plate 115.

Here, the guide body 112 is provided with rollers 127 on the side surface and the lower end side in order to reduce friction with the protective tube 101. As a result, the sliding contact resistance is reduced, and the protective tube 101 can be smoothly inserted into the overhead wire 100 without losing the force applied from the driving tire 116. The above tube inserter 110 is described in Patent Document 1.

JP-A-8-182135

However, the pipe inserter 110 as shown in FIG. 11 has a simple structure including only one driving tire 116, and since compressed air is press-fitted into the driving tire 116, the protective pipe 101 The contact area with is small. Therefore, when raindrops and the like are accumulated on the surface of the protective tube 101 during rainy weather, slip is likely to occur.

Therefore, an object of the present invention is to provide a protective tube inserter that is unlikely to slip due to raindrops even with a simple structure.

In order to achieve the above object, the protective tube inserter of the present invention is a protective tube inserter that inserts a protective tube having a slit from a tilt direction with respect to an overhead wire while widening a part of the slit. There is an electric wire gripping portion that grips the overhead wire with a pair of gripping pieces, an interrupting plate that is configured integrally with one of the gripping pieces, and that interrupts an edge in the slit, and the interrupting plate. On the edge side, a guide rail that extends in an inclined direction with respect to the grasped overhead wire and guides the inside of the protective tube, and is deformed and press-contacted so as to include a region of the protective tube that slidably contacts the guide rail. And a hollow rubber roller arranged.

In addition to the above configuration, the protective tube inserter of the present invention is characterized in that the rubber roller is deformable so as to contact the protective tube within a range of at least a central angle of 70 degrees.

In addition to the above configuration, the protective tube inserter of the present invention is characterized in that the rubber roller has an internal pressure of approximately atmospheric pressure in a non-deformed state.

As described above, according to the present invention, since the hollow rubber roller is arranged in pressure contact with the protective tube by deforming so as to include the area in sliding contact with the guide rail, the outside is compared with the center side of the contact area. They can be contacted with each other at extremely high pressure. That is, the contact area can be increased and the pressure can be concentrated outside the contact area. This facilitates the dispersion of raindrops and the like, and also prevents raindrops from entering the center side of the contact area, so that it is possible to obtain excellent grip performance in rainy weather.

Further, according to the present invention, in addition to the above effects, the rubber roller can be deformed so as to come into contact with the protective tube at least in the range of the central angle of 80 degrees, so that the slack on the center side of the contact region due to the deformation becomes more remarkable. .. That is, the concentration of pressure on the outside of the contact area becomes more effective.

Further, according to the present invention, in addition to the above effects, the rubber roller is filled with gas so that the internal pressure becomes substantially atmospheric pressure in a non-deformed state, so that the rubber roller can be deformed to the extent that the center side of the contact region is recessed. At the same time, the internal pressure rises appropriately during deformation. In this way, the internal pressure that is obtained moderately without hindering the deformation suppresses the fluctuation of the rubber roller, and it is possible to stably maintain a constant deformed state.

It is the whole front perspective view of the protection tube insertion device concerning a 1st embodiment. It is the whole back perspective view of the protection tube inserter concerning a 1st embodiment. It is the whole perspective view which shows the use condition of a protective tube insertion device. It is a front view which shows the use condition of a protective tube insertion device. It is the schematic diagram which showed the mode which looked at the rubber roller and protective tube of a pressure contact state from the bottom face side. It is a schematic diagram which showed the action of pressure by the vertical cross section. It is the whole front perspective view of the protection tube insertion device which concerns on 2nd Embodiment. It is sectional drawing by the front view which shows the use condition of a protection tube insertion device, (a) is a state in which a protection tube is not arrange | positioned, (b) is a figure which shows the state in which the protection tube is arrange | positioned. It is the schematic diagram which showed the mode which looked at the rubber roller and protective tube of a pressure contact state from the bottom face side. It is the figure which showed the conventional protection tube. It is the figure which showed the conventional tube inserter.

Hereinafter, a protective tube inserter according to an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is an overall perspective view of the protective tube inserter 1 according to the first embodiment of the present invention as viewed from the rubber roller 8 side. The side where the rubber roller 8 appears is referred to as the front side in this specification. 2 is an overall perspective view of the protective tube inserter 1 of FIG. 1 viewed from the side of the wire gripping portion 2 which is a gripping mechanism on the back side. The configurations will be individually described below. The protective tube will be described by taking the protective tube 101 of FIG. 10 as an example.

The electric wire gripping portion 2 is configured to be able to hold an overhead electric wire (hereinafter, simply referred to as an electric wire) by a pair of facing gripping pieces 2a and 2b. The wire grip portion 2 is configured to be opened and closed by rotating a screw shaft 10a directly connected to a connecting portion 10 to which a remote control rod 14 described later can be connected from a remote position. Of the pair of gripping pieces 2a, 2b, the gripping piece 2b having a U-shaped cross section for receiving an object on the lower side is integrally formed with a substantially triangular plate-shaped interrupting plate 4.

The interrupt plate 4 is a component that determines the direction of the slit by cutting the lower edge 4a into the slit of the protective tube. A guide rail 6 is arranged on the end edge 4a so as to extend in an inclined direction with respect to the electric wire to be gripped.

For the guide rail 6, a resin material such as Teflon (registered trademark) or a metal material with a small friction coefficient is used. Below the guide rail 6, a hollow rubber roller 8 is arranged in a pressed state with deformation.

The rubber roller 8 is formed integrally with the interrupt plate 4 and the guide rail 6 via a continuous member 18 extending from the back side of the gripping piece 2b having a U-shaped cross section. Rotational force is transmitted to the rubber roller 8 via the bevel gear 20.

The low rotation crown gear 20a of the bevel gear 20 is provided on the rubber roller 8 side, and the high rotation side pinion gear 20b is connected to a connecting portion 12 to which a remote control rod 16 described later can be connected.

With this configuration, in the protective tube inserter 1 according to the first embodiment of the present invention, the rubber roller 8 is always pressed against the guide roller and is in a deformed state. Next, the usage state will be described with reference to FIG.

FIG. 3 is an overall perspective view showing a usage state of the protective tube insertion device 1, and is a view seen from the front side like FIG. The electric wire 100 is grasped by the electric wire grasping portion 2, the protective tube 101 (see FIG. 10) is arranged on the guide rail 6, and the remote control rods 14, 16 are connected to the two connecting portions 10, 12. .. Since the electric wire 100, the protective tube 101, and the remote control rods 14 and 16 are all long pieces, they are partially omitted. FIG. 3 shows a state in which the male fitting portion 104 of the protective tube 101 is sandwiched between the rubber roller 8 and the guide rail 6. When inserting the protective tube 101, when the worker arranges the protective tube 101 to the position where the male fitting portion 104 is sandwiched in this way, thereafter, the rubber roller 8 to which the rotational driving force is transmitted through the remote control rod 16. Is sent to the electric wire 100 side.

The power source for generating the rotational driving force can be replaced with a lever-operated human power or a driving device using a hand drill or the like. Alternatively, the power source may be connected wirelessly or by wire and operated from a remote position. In this case, if a foot switch or the like is used, it is possible to avoid interference with an auxiliary work that directly handles the protective tube 101, so that safe and efficient work can be performed.

As described above, the rubber roller 8 has already been deformed before the protective tube 101 is interposed, but since it has a closed hollow structure and is filled with gas at a low pressure, the side where the rubber roller 8 is interposed is Even the female fitting portion 103 can be easily sandwiched by being further deformed. In the configuration according to the present embodiment, the pressure inside the rubber roller 8 is set to be substantially atmospheric pressure in the undeformed state.

Here, the state before being inserted into the electric wire 100 is shown, but the same applies to the case where the protective tube 101 is pulled out from the electric wire 100, and if the rotation drive mechanism (not shown) is reversed, either of the insertion and removal is performed. It can also be used for operation. Next, the usage state will be described from another angle.

FIG. 4 is a front view showing a usage state of the protective tube inserter 1. From the front view, it is easy to understand the degree of deformation of the rubber roller 8. The central angle θ of the rubber roller 8 indicates the range in which the rubber tube 8 can come into contact with the protective tube 101 due to the deformation. In the configuration according to the present embodiment, the value of the central angle θ is set to be about 80 degrees. However, in order to obtain the same effect, it is desirable to dispose the rubber roller 8 under pressure so that the central angle θ is at least 70 degrees.

Here are some specific numbers. It is assumed that the diameter of the protection tube 101 to be targeted is about 25 to 35 mm. On the other hand, on the rubber roller 8 side, the diameter is 113 mm, the roller surface width is 70 mm, the rubber thickness is 10 mm, the number of grooves is 36, the groove width is 4.4 mm, and the groove depth is 2.5 mm. The width of the convex portion is 5 mm.

The pressure distribution in the pressure contact state between the protective tube 101 and the rubber roller 8 will be described with reference to FIGS.

FIG. 5 is a schematic diagram showing a state in which the rubber roller 8 and the protective tube 101 in a pressure contact state are viewed from the bottom side. The guide rail 6 in the protective tube 101 is represented by a dotted line. For convenience of description, illustration of other configurations is omitted.

The contact area 22 of the rubber roller 8 with respect to the protective tube 101 is shown surrounded by a dashed line. In the substantially elliptical contact area 22, shaded areas are high- pressure areas 22a and 22b where the pressure is relatively high. As shown in FIG. 5, an arc-shaped high-pressure region 22a is formed on the end edge side in the longitudinal direction of the contact region 22. Further, in the width direction, a high pressure region 22b is formed along the longitudinal direction. Of these, in the high-pressure region 22a on the longitudinal direction side, the rubber roller 8 has the largest curvature, and the pressure is most likely to be concentrated.

Note that the high pressure regions 22a and 22b schematically show the distribution of relatively high pressure above a certain value. Therefore, depending on the relative size of the rubber roller 8 with respect to the protective tube 101 and the combination of the rubber thicknesses, the shapes of these regions may differ and the high pressure regions 22a and 22b may be represented continuously. However, in any combination, when the hollow rubber roller 8 is filled with gas at a low pressure (substantially atmospheric pressure) as in the configuration of this embodiment, the outer side with respect to the region on the center side is used. The point that pressure concentrates on the area of is common.

This is because the rubber roller 8 can be greatly deformed and the contact area is recessed so as to be folded back inward. In this way, since the outer circumference of the contact area contacts with a relatively high pressure, even if raindrops adhere to the protective pipe 101 in rainy weather, raindrops easily enter the contact area. It is not possible. As a result, slip due to raindrops can be prevented and stable work can be performed regardless of the weather.

FIG. 6 is a schematic diagram showing the action of pressure in a vertical cross section. As shown here, the rubber roller 8 is deformed so that the outer region is pulled toward the center side (directions of arrows B and C) by being pushed in the center side in the width direction (direction of arrow A). As a result, the protective tube 101 is deformed while generating a force to wrap it in the width direction. The force acting to wrap around stabilizes the protective tube 101 in the width direction and increases the grip force. Further, as described above, the action of preventing the intrusion of raindrops is also produced.

As described above, the protection tube inserter 1 according to the present embodiment does not require a mechanism for changing the distance between the guide rail 6 and the rubber roller 8 for inserting the protection tube 101 therebetween. As a result, the weight can be reduced, the handling can be facilitated, and the manufacturing cost can be kept low. And, even with such a simple structure of one roller, it is possible to efficiently transmit the force to the protective tube.

(Second embodiment)
FIG. 7 is an overall perspective view showing a protective tube inserter 51 according to the second embodiment of the present invention. It is the figure seen from the front side in which the rubber roller 58 is arrange | positioned similarly to FIG. 1 of 1st Embodiment. Here, the same components as those of the protective tube inserter 1 of FIG. 1 will be described with the same reference numerals.

In the protection tube inserter 1 of FIG. 1, the guide rail 6 is formed of a straight member, whereas the cutout 54b is formed in the interrupt plate 54 of the protection tube inserter 51 of FIG. The difference is that the guide rail 56 is partially cut through the notch 54b.

The notch 54b is formed slightly larger than the outer shape of the rubber roller 58. Therefore, in the configuration according to the present embodiment, the rubber roller 58 is not deformed when the protection tube 101 is not inserted. Next, the difference depending on the presence or absence of the protective tube 101 will be described with reference to FIG.

FIG. 8 is a front sectional view showing a usage state of the protective tube inserter 51 of FIG. Again, for the sake of convenience of description, the drawing is schematically illustrated with only the minimum necessary configuration. FIG. 8A shows a state in which the protective tube is not arranged, and FIG. 8B shows a state in which the protective tube is interposed. The triangular member is the interrupt plate 54. Arranged along the upper side of the interrupt plate 54 is the gripping piece 2a that receives an electric wire on the upper side of the electric wire gripping portion 2 (see FIG. 1). A guide rail 56 fills the lower edge of the interrupt plate 54. Further, in FIG. 8B, a member extending along the guide rail 56 at the lower end edge of the interrupt plate 54 represents a part of the wall of the protective tube 101.

First, referring to FIG. 8A, the rubber roller 58 is not deformed as described above when the protective tube 101 is not interposed. Therefore, even if the protective tube 101 slips off and slips, the rubber roller 58 does not come into sliding contact with the guide rail 56, and thus wear can be suppressed.

On the other hand, FIG. 8B shows a state in which the protective tube 101 is interposed and the rubber roller 58 is deformed. Focusing only on the relationship between the protective tube 101 and the rubber roller 58, it is the same as the protective tube inserter 1 in the first embodiment.

Next, the pressure distribution will be described as in the case of the first embodiment.

FIG. 9 is a schematic view of the rubber roller 58 and the protective tube 101 in a pressure contact state as seen from the bottom side. As in FIG. 5, the guide rail 56 in the protective tube 101 is shown by a dotted line. For convenience of description, the other configurations are not shown, which is also the same as FIG. As can be seen from FIG. 9, the contact region 60 of the rubber roller 58 with respect to the protective tube 101 and the pattern of the high pressure regions 60a and 60b in the contact region 60 which are equal to or higher than a certain level are formed in the cutout 54b of the interrupt plate 54 (see FIG. (See 8)) and is substantially the same.

Therefore, also in the protection tube inserter 51 according to the present embodiment, the pressure is most likely to be concentrated in the high pressure region 60a formed in the longitudinal direction. Here, attention is paid to the position of the guide rail 56. As shown in FIG. 7, the rubber roller 58 was housed inside the notch 54b in the state where the protective tube 101 was not interposed, but as shown in FIG. 8, it was pressed against the protective tube 101. As a result, it can be seen that the pressure contact region 60 is formed to be expanded slightly in the longitudinal direction and reaches the region where the guide rail 56 is formed (the position indicated by the arrows D and E in FIG. 8). Then, as described above, the pressure is most likely to be applied to the position of the guide rail 56. That is, the region where the notch 54b is formed is located on the center side where the pressure is relatively low. Therefore, in the feeding operation of the protective tube 101, the influence of the notch 54b hardly occurs.

Regarding the action of the high-pressure region 60b formed in the width direction, the description using FIG. 6 applies as it is.

As described above, according to the configuration of the present embodiment, it is possible to reduce wear of the rubber roller 58 during idling, even if an auxiliary roller such as a roller is not provided on the guide rail 56 side, and at the same time, replace it. Is also easy. In addition, in the work of inserting the protective tube 101, it is possible to obtain the same effect as that of the first embodiment.

The configuration described so far is a part of the embodiments of the present invention, and the following modifications are also included in the present invention.

In the above embodiment, the configuration in which the grooves extending in the width direction are formed in the rubber rollers 8 and 58 has been shown as an example, but the grooves are not essential.

Further, in the above-described embodiment, as the gripping mechanism of the electric wire gripping portion 2, the remote operation rod 14 is rotated around the axis and the feed screw mechanism is used to raise and lower one of the gripping pieces 2a and 2b. Shown as an example. However, it is also possible to replace with a gripping mechanism other than this. For example, it is possible to replace it with a combination of a rack and a pinion. In this case, if the shaft of the pinion is arranged horizontally, the elevating operation can be performed at a position horizontally separated from the electric wire and the protective tube inserters 1 and 51, so that interference with the operation of the rubber rollers 8 and 58 on the rotational drive side is possible. It is possible to avoid In addition, in the above-mentioned embodiment, the pair of gripping pieces 2a, 2b is one in which the raising and lowering portion employing the feed screw mechanism and the portion that directly abuts the electric wire are integrally configured as separate members in the electric wire gripping portion 2. Is shown as. However, the configuration in which the portion that directly abuts the electric wire and the holding mechanism portion are continuously formed of the same member is also a pair of gripping pieces 2a and 2b, and the configuration of the electric wire gripping portion 2 is widely understood.

In addition, in the above embodiment, the configuration in which the rubber rollers 8 and 58 are arranged near the center of the guide rails 6 and 56 is shown as an example. However, the rubber rollers 8 and 58 may be arranged anywhere as long as they are opposed to the guide rails 6 and 56. Therefore, it may be arranged near the tips of the guide rails 6 and 56 depending on the shape and diameter of the fitting portion of the protection tube 101 to be targeted.

Further, in the above-described embodiment, the guide rails 6 and 56 are shown as an example of the structure formed by one continuous member. However, if the pressure contact area of the guide roller is partly included (overlapped) and extends along one virtual guideline that is inclined with respect to the electric wire to be gripped, a plurality of guide rollers can be provided. The structure may be divided. Similarly, also in the second embodiment, even if the guide rails 6 and 56 are divided in a region other than the notch 54b, if one virtual guideline is formed as a whole, it is the same. It is possible to obtain an effect.

In addition, in the above-described embodiment, the configuration in which the width of the roller surface of the rubber rollers 8 and 58 is wider than that of the protective tube is shown as an example. However, if at least the width of the roller surface is set to be wider than the width of the guide rails 6 and 56, a force that wraps in the width direction at the time of deformation can be obtained.

Further, in the above-described second embodiment, the guide rail 56 is divided at the cross-sectional position shown in FIG. 8 at the location where the cutout 54b of the interrupt plate 54 is formed, and the perspective view shown in FIG. In the figure, a partially continuous configuration is shown as an example. However, the guide rail 56 may be completely divided not only at the cross-sectional position but also at the side.

In addition, in the above-described embodiment, the rubber rollers 8 and 58 are both shown as an example in which the sealed space is filled with gas at about atmospheric pressure. However, as long as it is deformable to the same extent and has a rubber thickness that produces an appropriate pressure, it may not be hermetically sealed.

The protective tube inserter of the present invention can grip the protective tube reliably in a wide contact area, and is particularly useful for work such as in rainy weather.

DESCRIPTION OF SYMBOLS 1 Protective tube inserter 2 Electric wire gripping parts 2a, 2b Gripping piece 4 Interruption plate 4a Edge 6 Guide rail 8 Rubber roller 10, 12 Connecting part 10a Screw shaft 14, 16 Remote control rod 18 Connection member 20 Bevel gear 20a Crown Gear 20b Pinion gear 22 Contact area 22a, 22b High pressure area 51 Protective tube inserter 54 Interruption plate 54a End edge 54b Notch 56 Guide rail 58 Rubber roller 60 Pressure contact area 60a, 60b High voltage area 100 (Overhead) electric wire 101 Protective tube 102 Body part 103 Female fitting part 104 Male fitting part 106 Accommodating part 107 Opening part 109 Fin part 110 Tube inserter 111 Wire holding angle 112 Guide body 113 Guide rod 115 Tube expansion plate 116 Driving tire 127 Rollers A, B, C, D, E Arrow θ Center angle

Claims (3)

1. A protective tube inserter for inserting a protective tube having a slit formed therein from a tilt direction with respect to an overhead wire while widening a part of the slit,
   An electric wire gripping portion that grips the overhead wire by a pair of gripping pieces,
   An interrupt plate that is configured integrally with one of the grip pieces and that interrupts an edge in the slit,
   On the edge side of the interrupt plate, a guide rail that extends in an inclined direction with respect to the grasped overhead wire and guides the inside of the protective tube,
   A protective tube inserter, comprising: a hollow rubber roller, which is deformed so as to include an area of the protective tube that is in sliding contact with the guide rail and is arranged in pressure contact.
2. The protective tube inserter according to claim 1, wherein the rubber roller is deformable so as to contact the protective tube within a range of at least a central angle of 70 degrees.
3. The protective tube inserter according to claim 1 or 2, wherein the rubber roller has an internal pressure of substantially atmospheric pressure in a non-deformed state.
   
   

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