JPH0321133Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention applies to high voltages such as 22KV and
This relates to a device for inserting protective tubes into special high voltage distribution lines, which is used to install protective tubes to prevent electric shock on 33KV distribution lines.

In the current situation where power distribution lines are generally installed on utility poles erected along roads, for example, equipment used for civil engineering and construction work and workers engaged in it are being laid on or near roads. In order to prevent accidents caused by accidental contact with electric wires, protective tubes to prevent electric shock are installed at important points on power distribution lines, but this installation work has been increasing in recent years. The weight of power line maintenance work is increasing.

This protection work for power distribution lines is required to be carried out quickly at important points based on findings during patrols or requests from clients.

The protective tube 1 for preventing electric shock has a cross-sectional shape as shown in FIG.
It has a round pipe shape with a pair of ears 3 protruding from the opening 2, and is made of a polyethylene synthetic resin material with excellent electrical insulation, flexibility, and elasticity, and has a unit length of about 3 m. They are connected at their ends via connectors (not shown) of similar shape and material to obtain the required length. For the protection work of the high-voltage power distribution line in which the electric shock prevention protective tube (hereinafter abbreviated as polyethylene tube) 1 is attached to the power distribution line 4, the automatic A polyethylene tube insertion machine has been conventionally used as a device that satisfies the above requirements and enables work to be performed safely and labor-savingly.

The automatic plastic pipe inserting machine is configured such that the plastic pipe 1 shown in FIG. The plastic pipe guide opening is provided with a plastic pipe guide opening that is widened to a large extent, and a plastic pipe feeding mechanism is provided diagonally downwardly behind the plastic pipe guide opening, and a plastic pipe that connects the two is provided between the plastic pipe guide opening and the plastic pipe feeding mechanism. The device includes a core for guiding a tube, and a supporting member having a clamping portion for a distribution line and a hanging pipe having a hooking portion for the distribution line in the polyurethane tube guide opening and the polyurethane tube feeding mechanism portion, respectively. The entire device is used by being suspended and fixed to a power distribution line using the above-mentioned suspension member and suspension pipe.

When in use, the entire device is suspended and fixed to the power distribution line as described above so that the tip of the plastic pipe guiding core is on the same plane as and close to the power distribution line. Then, the ends of the plastic pipe 1 are connected to each other via the connector, and the plastic pipe 1 is made to a predetermined length, and is inserted from the lower end into the plastic pipe guiding core with the ears facing upward. The ear part 3 is placed between the feed rollers of the plastic tube feeding mechanism section, and is sent diagonally upward along the plastic tube guiding core. Then, the plastic pipe 1 thus sent out is sequentially inserted into the distribution line 4 in the above-mentioned upside down state with the opening 2 and the ear part 3 expanded sufficiently at the plastic pipe guide opening. The opening 2 and ears 3 of the plastic pipe 1 are restored due to its own elasticity, and then gradually rotated by 180° on the distribution line 4 due to the weight of the ears 3, resulting in the state shown in Fig. 4. It is attached to the power distribution line 4 at.

However, with this conventional automatic polyethylene tube insertion machine, a worker wearing insulating armor must get very close to the high-voltage distribution line 4 and suspend and fix the entire device to the overhead line.

On the other hand, although 6.6KV has traditionally been the mainstream for distribution lines, recently 22KV or 22KV or
As distribution lines with a voltage boosted to 33KV are being installed one after another, it is important to carry out protection work on distribution lines using the above-mentioned polyethylene tube insertion machine while the power is on. Even if insulating armor is used, it is practically impossible, and an electric motor is used to drive the plastic pipe feeding mechanism, and the conductor to this electric motor itself is a leakage medium from the power distribution line as described above. As a result, conventional plastic tube insertion machines have come to be considered unsuitable for use with this type of distribution line.

In view of the above-mentioned current situation, this idea was developed to insert a protective tube into extra-high voltage distribution lines, which saves labor in the same way as before, but ensures work safety for distribution lines with significantly increased voltage. The purpose is to provide a device.

Hereinafter, an embodiment of the device according to the invention will be described in detail with reference to the drawings.

FIG. 1 is a front view of the external appearance of this embodiment device.
FIG. 2 is an external plan view seen from the direction of the large arrow. This device consists of a plastic pipe feeding mechanism part A located diagonally below, a plastic pipe opening guide part B located diagonally above the mechanism part A, and a plastic pipe guide arranged along both parts A and B. A main body consisting of a core part C and an interference avoidance part D occupying a position close to the intermediate rear side of the core part C, and a hanging holder for setting this main body to an insertion position close to the special high voltage distribution line 4. It consists of part E.

In the polyurethane tube feeding mechanism section A, four roller support shafts 12 are fixed horizontally in a cantilevered manner on the front side of a substrate 11 which is suspended and held by a suspension holding section E so as to be able to rise and fall freely, and on the top and bottom, left and right sides, respectively. A hollow shaft 15 having a roller 13 fixed to the front end and a driven sprocket wheel 14 fixed to the rear end is rotatably fitted to each support shaft 12, thereby forming two sets of upper and lower rollers 13. Feed rollers are arranged in parallel, and the feed rollers sandwich the ear part 3 and feed it. A gear 7 and two identical drive sprocket wheels 18 are fixed to each of the drive shafts 16, respectively, and the drive shaft 16 located at the bottom is connected to a hydraulic shaft mounted in a cantilever manner on the back side of the base plate 1. It is configured by being connected to the output shaft of the motor 19.
The gears 17 fixed to each drive shaft 16 are meshed with each other, and the drive sprocket wheel 1
8 and the driven sprocket wheel 14, an endless chain is stretched between them. Each roller 13 of the feed rollers is equipped with a solid rubber tire, and the rollers 13 arranged above and below each other.
Roller 1 so that there is a small gap between
The outer diameter dimension of 3 is taken.

Since the drive mechanism of the plastic tube feed mechanism section A is configured as described above, the hydraulic motor 19, which is small but has a large drive torque, is used to drive the feed roller.
is operated so that the output shaft rotates counterclockwise toward it, the roller 13 disposed on the upper side
are actively rotated in the clockwise direction indicated by the arrows, and the rollers 13 disposed below are actively rotated in the counterclockwise direction indicated by the arrows.

This means that, for example, the polyethylene pipe 1 with sufficient insulation against voltages of 22KV and 33KV,
Since the wall thickness is slightly thicker than the conventional one that can withstand a voltage of 6.6KV, and the flexibility is slightly inferior, the pair of ears 3 is inserted into the gap between the rollers 13 as shown in FIG. Although a considerably large resistance occurs when the polyester tube 1 is fed out, this resistance can be overcome and the polyester tube 1 can be fed out without slipping.

In this case, the roller 13 is elastically deformed at the portion 13' of the solid tire that comes into contact with the ear 3 of the polyester tube 1, but at the same time, the distance between the upper and lower roller support shafts 12 is expanded through the rollers 13. A force acts on each support shaft 12. Therefore, the pair of upper and lower support shafts 12 are reinforced by connecting their end faces via the connecting plate 10.

The plastic pipe opening guide part B is inserted into the plastic pipe guiding core part C, and the ear part 3 comes into contact with the inner wall surface of the plastic pipe 1 that is being fed out along the core part C while being held by the feeding rollers, By applying an outward force approximately along the diameter thereof, the opening 2, the pair of ears 3
The guide rod 21 of the core C is used to widen the gap sufficiently larger than the diameter of the distribution line 4.
It has a flat part that is connected to the tip of the roller and forms a vertical surface integral with it, and on the upper side of this flat part, there are a plurality of freely rotating rollers 22 (5 in this example) made of small-diameter miniature bearings. A plurality of freely rotating rollers 23 (six in this example) made of miniature bearings having a slightly larger diameter are arranged in a straight line at appropriate intervals, and a plurality of free rotating rollers 23 (six in this example) are arranged in a straight line on the lower side thereof, and the rollers 22 are arranged in a straight line at appropriate intervals. The rollers 22 and 23 are arranged in a staggered manner so that the distance between the outer tangent lines of the rollers 22 and 23 is sufficiently larger than the inner diameter of the polyester pipe 1.

The polyester pipe guide core C has a guide rod 21 having a circular cross-section and approximately the same thickness as the distribution line 4, fixed to the board 11 in a cantilever manner at a portion approximately 1/3 of its length. By fixing the support arm 24 to the support arm 24 by welding or the like, and by supporting the auxiliary arm 25 approximately in the middle part attached to the interference avoidance part D, its axis is close to the front surface of the feed roller and the direction of the feed roller is fixed. It is made to match.

However, the axis of the guide rod 21 is connected to the connection part with the plastic pipe opening guide part B and the plastic pipe feeding mechanism part A.
The guide rod 2 of the plastic pipe 1 is bent slightly downward in the former and considerably bent downward in the latter.
1 and the plastic pipe 1 into the distribution line 4, respectively.

The interference avoidance section D moves the polyethylene tube opening guide section B close to the distribution line 4 as described later, and in the process of feeding the polyester tube 1 along the guide rod 21 by the feed roller, the interference avoidance section D prevents the This is to push the upper ear part 3 slightly upwards from the power distribution line 4 so that the ear part 3, especially the ear part 3 located on the upper side, does not interfere with the power distribution line 4. A bow-shaped support plate 27 is fixed to the supported pair of support shafts 26, and a plurality of freely rotating rollers 28 (in this example, five) made of miniature bearings are attached at appropriate intervals near the upper side of the support plate 27. It is configured by arranging the

The hanging holding part E is for setting the main body consisting of the above-mentioned polyethylene pipe feeding mechanism part A, opening guide part B, guiding core part C and interference avoidance part D to an insertion position close to the high voltage distribution line 4. The guide bracket 29 attached to the board 11 is slidably engaged with glass fiber reinforced plastic, so-called FRP, which has excellent mechanical strength and electrical insulation performance.
A pipe-shaped support 30 made of wood, a fixing part 31 to the power distribution line 4 provided at the upper end of the support 30, an operation part 32 that causes the fixing part 31 to perform an operation of clamping and fixing the power distribution line 4, and the main body, It is comprised of a winding device 34 that raises or lowers a nylon rope 33 with good electrical insulation connected to the substrate 11 along the pillar 30 by winding or letting it out.

The fixing part 31 is a bracket 3 connected to the upper end of the support column 30, as seen in the partial external side view shown in FIG. 5 when viewed in the direction of the arrow in FIG.
5, a support plate 36 with a tip bent at an angle of 120 degrees is fixed in a protruding manner. A holding plate 38 formed in an inverted dogleg shape is slidably engaged, and the lower ridge of the rear end surface of this holding plate 38 is connected to the conical end portion of the operating section 32 (to be described later). The contact is maintained at all times by the elastic force of a compression coil spring (not shown).

The operating section 32 includes an operating section 39 having the conical section at its tip, and is connected to the operating section 39 and the bracket 35.
An operating rod 40, which has a threaded portion at its upper end that is screwed into a nut fixed to the rod, is passed through the internal space of the column 30, and is rotated by bearings (not shown) provided at the upper and lower portions of the rod. freely supported,
An operating knob 41 is fixed to its lower end. The operating portion 39, the threaded portion, the operating rod 40, and the operating knob 41 are all made of resin material with excellent electrical insulation performance and mechanical strength.
For example, it is made of polyacetal.

The winding device 34 includes a pair of pulleys 42 rotatably supported by a support frame fixed to the upper part of the support plate 36.
As shown in the partial external side view of FIG. 4, a winding drum 43 is attached to a fixed frame near the lower end of the support 30, and its end is connected to the base plate 11.
It consists of a nylon rope 33 whose other end is connected to a winding drum 43 through the pair of pulleys 42, and the rope 33 is wound up by rotating the winding drum 43 with a handle 44. The main body can be pulled up along the support column 30 by the guide bracket 29, and a ratchet is provided between the drive shaft of the winding drum 43 and the framework in order to hold the main body at the desired raised position. A mechanism 45 is provided.

When the main body is pulled up along the pillar 33 by the winding device 34 described above and set close to the distribution line 4 installed almost horizontally, the polyester pipe opening guide part B is kept horizontally, Its axis is located on a plane containing the axis of the distribution line 4, and both axes intersect with each other near the tip of the polyester pipe opening guide part B as shown in FIG.
From the plastic pipe opening guide part B, the ear part 3 and the opening part 2
It is necessary to make it easy for the expanded polyethylene pipe 1 to be inserted into the distribution line 4.

For this purpose, the board 11 is provided with a notch for positioning it with the support plate 36 connected to the upper end of the support column 30, and the guide rod 21
forms an angle of about 5° in front of the distribution line 4 in the horizontal plane, as shown in Figure 2.
In addition, in the vertical plane, a guide bracket 29 is attached below the guide bracket 29 at an angle of about 10 degrees as shown in FIG.
A keyway (not shown) provided in the guide bracket 29 for the support column 30 that is fixed as shown in the figure.
It is held in a constant relative angular position by engaging a key 46 along the axis of the post 30.

Also, the support column 30 and the operation unit 3 held therein.
2, a grounding terminal 47 is embedded in the lower end of the support column 30 in order to discharge charges accumulated due to leakage current from the 22 or 33KV distribution line. The hydraulic motor 19 is connected to a hydraulic power source (not shown) through high-pressure hoses 48 and 49 made of plastic or oil-resistant rubber and forming a supply line and a discharge line for hydraulic oil, respectively.

Next, the operation of this device will be explained.

For example, the support 30, main body, lifting tool, hydraulic valve, and hose of this device are mounted on the lifting platform of a track maintenance vehicle equipped with a hydraulic lifting platform, and the hose 4
8 and 49 are connected to the high-pressure oil passage and discharge oil passage of the hydraulic power source device of the working vehicle, respectively, and a grounded conducting wire is connected to the ground terminal 47. The line protection work vehicle prepared in this way is parked below the distribution line 4 to be protected, and then the elevating platform is raised, and the support 30 fixed thereto is attached to the fixed part 31 to move the distribution line 4 as shown in FIG. Fixed at 4.

For this fixing, please prepare the knob 4 of the operating section 32 in advance.
1 and slightly pulls down the actuating part 39, the clamping plate 38 is elastically retracted, and the distribution line 4 can be fully inserted between the tips of the supporting plate 36 and the clamping plate 38, respectively. Leave a gap. Then, adjust the fixed position of the support column 30 with respect to the lifting platform as appropriate so that the power distribution line 4 fits into the gap, turn the knob 41 in the opposite direction, and then
9 and press the holding plate 38 with its conical part.
is pushed out against the elastic force, and the power distribution line 4 is clamped and fixed at the tips of the support plate 36 and the clamp plate 38, respectively.

Next, polyethylene pipes 1 having a unit length of 3 m and having sufficient withstand voltage for voltages of 22 KV and 33 KV are connected to each other via the connector so that the length of the distribution line 4 is equal to the length that requires protection. After connecting this poly tube 1 with the ear part 3 connected to the board 1
Insert it into the guide rod 21 of the plastic tube guide core C so that it faces the 1 side, and drive the hydraulic motor 19 to rotate each roller 13 of the plastic tube feed mechanism section B in the direction of the arrow. When the section 3 is clamped and sent out until the tip of the polyester pipe 1 reaches a position immediately before the interference avoidance section D, the operation of the hydraulic motor 19 is stopped.

With the polyethylene pipe 1 inserted into the guide rod 21 in this way, turn the handle 44 and tighten the nylon rope 3.
3 on the winding drum 43, and the main body is attached to the support 30.
The distal end of the plastic pipe opening guide B is held as close to the distribution line 4 as possible so that its axis is located on the same plane as the axis of the distribution line 4 installed horizontally, for example. Then, when the hydraulic motor 19 is operated again, the plastic pipe 1 inserted into the guide rod 21 is fed out along it, and the upper part of the ear part 3 facing the board 11 side is moved to the interference avoidance part on the back side. D free rotating roller 2
8. As described above, the rollers 28 are arranged in the shape of a medium-high arch on the support plate 27, so as the plastic pipe 1 moves forward along the guide rod 21, the upper ear 3 is lifted up by the rollers 28. This allows the support plate 27 to be passed closely over the power distribution line 4 installed behind and close to the support plate 27, thereby avoiding interference with the power distribution line 4. The polyester pipe 1 that is further fed out along the guide rod 21 is fed into the polyester pipe opening guide section B with only the upper ear portion 3 partially in contact with the power distribution line 4. Plastic pipe opening guide part B
The inner wall surface of the plastic pipe 1 fed into the tube is brought into contact with the free rotating roller 22 on the upper side and the free rotating roller 23 on the lower side, so that it is pushed outward in the approximately diametrical direction, and the opening 2 and the ear are brought into contact with each other. Each gap between the portions 3 is expanded to be sufficiently larger than the diameter of the power distribution line 4.

In this state, the plastic pipe 1 is pushed out from the plastic pipe opening guide part B, so the plastic pipe 1 is smoothly and sequentially inserted into the distribution line 4 from the opening 2. 1 is restored to its original shape by its own elasticity, and then gradually twisted by the weight of the ear part 3, rotated by 90 degrees, and is attached to the distribution line 4 in the state shown in Fig. 4. The Rukoto. Note that if the end of the plastic pipe 1 comes off the feed roller, it will not be possible to feed it along the plastic pipe guiding core C. A long auxiliary polyester pipe is connected so as to be detachable with a suitable joint, and once the polyester pipe 1 has been attached to the distribution line 4 up to the end via this auxiliary polyester pipe, the hydraulic motor 19 is reversed and the auxiliary polyester pipe is connected. What is necessary is just to separate it from the plastic pipe 1 to which the pipe is attached. Furthermore, when fixing the support column 30 to the distribution line 4 using the fixing part 31, the main body is removed from the guide bracket 29 together with the board 11, and the main body is placed on the lifting platform of the work vehicle with the rope 33 connected to the board 11, Only the support column 30 is fixed to the distribution line 4 as described above, and then the winding device 34
If the board 11 is connected to the guide bracket 29 while lifting the main body, the setting work can be easily performed.

As is clear from the above explanation, in the device for inserting protective tubes into special high voltage distribution lines according to this invention, when the device is set at the polyethylene tube insertion position, the voltage is significantly increased to 22KV and 33KV. Fix a pole with sufficient insulation to the distribution line at a location that is at least a specified safe approach distance away from the overhead line, and then operate a winding device at a location that is also far away to ensure good insulation performance. The main body can be lifted and held in a position close to the overhead wire via a rope, and a hydraulic motor is used to drive the plastic pipe feeding mechanism, so there is no leakage of the conductor like in the case of conventional electric motors. Since there is no risk of it becoming a medium, workers wearing the same level of insulating protective equipment as before can carry out protective work that involves inserting live polyethylene pipes into distribution lines with much higher voltages than before. It can be carried out safely without any fear of electric shock. In addition, the feed roller of the plastic pipe feed mechanism is actively driven by a high-torque hydraulic motor, and the rigidity of the feed roller support shaft has been increased, making the wall slightly thicker and more flexible. Polyester pipes that withstand the voltage, which is somewhat inferior in terms of performance and has a large resistance during feeding, can be smoothly fed out and easily attached to power distribution lines in a short time.

[Brief explanation of the drawing]

Fig. 1 is a front view of the external appearance of an embodiment of the device according to this invention, Fig. 2 is a plan view of its external form as seen from the direction of the bold arrow, and Fig. 3 is a winding device forming a part of the hanging holding part of this device. Figure 4 is a cross-sectional view showing how the plastic pipe is attached to the distribution line; Figure 5 is a partial side view showing the fixing part that forms part of the hanging holding part of this device; FIG. 6 is a partial cross-sectional view showing the feeding operation of the plastic tube by the feeding roller of the feeding mechanism section of this device. 1...Protective tube (polymer pipe), 2...Opening, 3...
... Ear part, 4 ... Distribution line, 11 ... Board, 13 ...
Roller, 14... Driven sprocket wheel, 1
7... Gear, 18... Drive sprocket wheel, 19... Hydraulic motor, 21... Guide rod,
22, 23, 28...free rotation roller, 29...
Guide bracket, 30... Support column, 31... Fixed part, 33... Nylon rope, 34... Winding device, 36... Support plate, 38... Holding plate, 39...
Actuating part having a conical part, 40... Operating rod, 4
1...knob, 42...pulley, 43...winding drum, A...polymer tube feeding mechanism section, B...polymer tube opening guide section, C...polymer tube guiding core, D...interference avoidance Part, E... Hanging holding part.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Rollers that are rotationally driven by a motor are disposed facing each other, and the rotating rollers have a round pipe shape and an opening is formed on the outer circumferential surface of the roller along the entire length along the axial direction. and inserting the ear portions of a protective tube for preventing electric shock, which has a pair of ear portions facing each other and protruding over the entire length along the axial direction, integrally into each of the mutually opposing ends of the opening; A protective tube feeding mechanism section that sends out a protective tube for preventing electric shock by clamping it, and rollers that are installed diagonally above this protective tube feeding mechanism section and rotate freely, and the interval between the outer tangents of each roller is a protective tube for preventing electric shock. Arranged so that it is larger than the inner diameter of the pipe,
A protective tube opening guide section that expands the electric shock prevention protective tube sent out by the protective tube feeding mechanism section so that the gap between the opening and the ear is sufficiently wider than the thickness of the distribution line; and the protective tube opening guide section. and the protective tube feeding mechanism section, a protective tube guiding core section having a circular cross section for externally guiding the protective tube for preventing electric shock, and the protective tube feeding mechanism section and the protective tube guiding core section. A suspension fixing part that suspends a main body consisting of a core part and a protective pipe opening guide part while maintaining a certain inclined attitude relative to a power distribution line, and fixes the tip of the protective pipe opening guide part in close proximity to the power distribution line. In the apparatus for inserting a protective tube into a power distribution line, a hydraulic motor is used as the motor, and a board for holding the main body on the front is provided, and this board is connected to an electric The electric insulating rope is slidably engaged with a column made of an insulating material via a guide bracket, and furthermore, a pulley is provided on the side of the fixed part, a winding drum is provided at the bottom of the column, and one end of the electrically insulating rope is attached to the column. A device for inserting a protective tube into an extra high voltage distribution line, characterized in that the protective tube is connected to the substrate and the other end is connected to the winding drum via the pulley. 2. The support that slidably holds the board via the guide bracket is a pipe-shaped piece made of electrically insulating material, and the fixing part that holds this support to the distribution line is cantilevered at the upper end of the support. It is composed of a fixed support plate with a bent tip, and a clamping plate slidably connected to the support plate, and further has a conical part at its tip that contacts the rear end of the clamping plate, and An operating rod of an electrically insulating material is housed inside the pipe-shaped support and is rotatably held by the support by a screw feeding mechanism interposed between the two, and protrudes from the lower end of the support. Claim 1 of the Utility Model Registration Claim: By rotating the conical portion, the conical portion is pushed up, the holding plate is pushed out, and the distribution line is held and fixed between the ends of the support plate and the holding plate, respectively. Protective tube insertion device for special high voltage distribution lines.