Hanging car for overhead line construction

Abstract

To facilitate confirmation of the state of an opening / closing pin for closing a hanging sheave, and protect the opening / closing pin so as to prevent the hanging sheave from being accidentally opened.SOLUTION: A hanging sheave 1 is provided with an opening / closing roller 3 having a base end supported by a bearing 8 that is oscillatable and can change a relative angle to an adjacent roller 3, and has a leading end supported by a bearing 8 that couples the leading end with an adjacent roller 3 in a couplable / separatable manner, in order to pass a wire in a roller ring body 2 that is formed by connecting a plurality of rollers 3 into a ring shape. The bearing 8 includes an opening / closing pin 11 for locking the bearing 8 so as to make the bearing 8 axially movable between an insertion position for coupling the leading end-side bearing 8 and a release position for separating the bearing 8. The bearing 8 is provided with a pin cover 5 that is movable between a closed position where the pin cover is projected to an extension direction of the opening / closing pin 11 so as to inhibit movement to the release position and an exposed position where the pin cover is off the extension direction of the opening / closing pin 11 so as to allow movement of the opening / closing pin 11 to the release position, and is inhibited from moving to the closed position by the opening / closing pin 11 located at the release position.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a sling wagon used in overhead line installation work, such as replacing an existing electric wire with a new wire. [Background technology]

[0002] In electric wire replacement work using this type of sling wagon, a pilot rope is installed separately above the existing line and with sling wagons attached at specified intervals, which is then deployed between the pylons. This rope is then tensioned across the pylon span to transfer the tension of the existing line to the pilot rope. A new line is then connected to the end of the existing line that has lost tension, and the existing line is sent along with the sling wagon while being wound up and retrieved with a winch, and replaced with the new line. As described in Patent Documents 1 and 2, a conventional hanging pulley includes six rollers that are connected in a ring shape and supported for rotation so that both electric wires are inserted inside, and one of the rollers arranged in a ring shape has a hinge part at one end and a connection part at the other end. The connection part is equipped with an opening / closing pin that connects to an adjacent roller by inserting the opening / closing pin into the hinge, which involves a rotation operation around the axis and a push-in operation in the axial direction, guided by an engagement protrusion that protrudes into a roughly U-shaped guide groove on the axis, and that separates from the adjacent roller by pulling out the opening / closing pin in the axial direction and coming out of the hinge, which involves a reversal operation around the axis. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-333789 A [Patent Document 2] Japanese Utility Model Application Publication No. 1-061814 DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0004] In the above-mentioned conventional slings, the rollers may inadvertently open during the wire feeding operation, causing the wire to fall off as a hook-shaped cantilever, or the supporting strength may decrease, making the slings prone to breakage, and there is a risk that the broken part of the sling or the wire may fall and come into contact with the equipment or workers below. The operation of closing the rollers with the opening and closing pins is performed while wearing thick work gloves that are voltage-resistant, which tends to hinder fine finger movements, and it is not easy to instantly check the depth of the opening and closing pins when attaching the slings to the pilot rope that is continuously paid out, so it is easy to overlook the opening and closing pins being incompletely inserted. In addition, during the wire drawing, accessories such as running boards may become an obstacle and collide with the opening and closing pins, causing them to be damaged, and the opening and closing pins may not be inserted completely. Therefore, the objective of the present invention is to provide a safe sling that can inevitably recognize the closed state of the roller by the opening and closing pin, prevents direct collision of accessories on the existing line with the opening and closing pin, and prevents inadvertent opening of the roller due to the opening and closing pin. [Means for solving the problem]

[0005] In order to solve the above problem, the sling 1 of the present invention comprises a roller ring 2 consisting of a plurality of rollers 3 connected in a ring shape so as to pass both electric wires inside, and one opening / closing roller 3 whose base end is supported by a swingable bearing 8 which can change the relative angle with the adjacent roller 3 and whose tip end is supported by a bearing 8 which engages with the adjacent roller 3 so as to be connectable and separable to each other in order to open and close the roller ring 2 to pass the electric wires inside, and an opening / closing pin 11 which engages with the bearing 8 so as to be axially movable between an insertion position for connecting the bearing 8 at the tip side of the opening / closing roller 3 and an extraction position for separating the same, and which is biased in the extraction direction by a compression spring 12. Furthermore, the sling wheel 1 is equipped with a pin cover 5 which is movable between a closed position in which it engages with the bearing 8 at the tip side of the opening / closing roller 3 so as to protrude along the extension of the opening / closing pin 11, preventing movement to the extraction position, and an exposed position in which it engages with the opening / closing pin 11 so as to disengage from the extension of the opening / closing pin 11, allowing movement of the opening / closing pin 11 to the extraction position, and which is prevented from moving to the closed position by the opening / closing pin 11 in the extraction position. Effect of the Invention

[0006] According to the present invention, the pin cover prevents the movement of the opening and closing pin at the insertion position where the bearing on the tip side of the opening and closing roller is connected to the bearing of the adjacent roller, so that the opening and closing roller does not open inadvertently during the wire feeding operation, and therefore the wire is not supported on one side, preventing the wire from coming off and the reduction in support strength, and avoiding the damage to the pulley and the falling of the wire due to breakage, thereby ensuring the safety of the equipment and workers below. In addition, since the pin cover cannot be moved to the closed position when the opening and closing pin is in the extraction position, the extraction state of the opening and closing pin can be confirmed, and incomplete connection of the opening roller is prevented. Furthermore, the pin cover protects the opening and closing pin from direct collision with accessories on the existing line during laying, and prevents the roller from opening due to damage. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is a perspective view of a sling wheel according to the present invention. [Diagram 2] FIG. 2 is a front view of the shackle wheel of FIG. [Diagram 3] FIG. 2 is a side view of the sling wheel of FIG. [Figure 4] FIG. 2 is a front view of the sling wheel of FIG. 1 in an open state. [Diagram 5] FIG. [Figure 6] 1A and 1B are perspective views of a pin cover of a shackle wheel, in which (A) shows the closed state and (B) shows the open state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] An embodiment of the present invention will be described with reference to the drawings. In Figures 1 to 3, the sling 1 comprises a roller ring 2 having six rollers 3 connected in a ring shape to feed an electric wire passed inside, and the opening and closing rollers 3 at the upper edge of the roller ring 2 being able to swing, a rope mounting bracket 4 for holding a pilot rope at the upper part of the roller ring 2, a pin cover 5 for covering the opening and closing ends of the opening and closing rollers 3, and a hanging ring 6 fixed between both ends of the rollers 3 at the lower edge of the roller ring 2.

[0009] The roller ring 2 comprises six rollers 3 arranged in a hexagonal shape, four common bearings 7 located at the apexes of the hexagon formed by these rollers 3 and supporting adjacent rollers 3 together so that they can rotate freely, and four independent bearings 8 located at both ends of the opening / closing roller 3 and supporting the roller 3 and the adjacent roller 3 individually so that they can rotate freely.

[0010] One of the adjacent independent bearings 8, 8 is provided with a connecting hinge 9 at the base end for pivotally supporting the opening / closing roller 3 so that it can be raised and lowered, and the other is provided with a connecting hinge 10 capable of connecting and separating the tip end of the roller 3.

[0011] The connecting hinge 9 includes a pair of hinge cylinders 9a, 9b arranged coaxially between the adjacent independent bearings 8, 8, and a connecting bolt 9c that penetrates both the hinge cylinders 9a, 9b and connects them to be freely rotatable relative to each other. The connecting hinge 10 includes a pair of hinge cylinders 10a, 10c that protrude from one of the adjacent independent bearings 8, 8 at a distance from each other, a hinge cylinder 10b that protrudes from the other and is arranged coaxially between the hinge cylinders 10a, 10c, an opening / closing pin 11 that is inserted and removed between the two adjacent hinge cylinders 10a, 10b, and a compression spring 12 that biases the opening / closing pin 11 in a direction to remove it from the hinge cylinders 10a, 10b. The opening / closing pin 11 includes a shaft portion 11a that rotatably penetrates the hinge cylinders 10a, 10b, 10c, and a knob head 11b at one end of the shaft portion 11a. The opening / closing pin 11 has a guide groove (not shown) in a substantially U-shape on the side of the shaft portion 11a, and a guide protrusion 13 fixed radially to the hinge cylinder 10c protrudes into the guide groove, and the rotation around the axis and the insertion / removal operation in the axial direction are guided along the guide groove. That is, the opening / closing pin 11 is restricted in operation to a movable range between a locking position where it penetrates the hinge cylinders 10a, 10b, and 10c, a release position where it is slightly pushed in from the locking position and rotated around the axis, and an open position where it is pushed out by the compression spring 12 from the release position and escapes from the hinge cylinders 10a and 10b.

[0012] The rope mounting bracket 4 comprises a base plate 14, both longitudinal ends of which are fixed by bolts 17 to the independent bearings 8, 8 which support the opening / closing rollers 3, a pair of cylindrical fixed receivers 15 which are provided on the middle part of the base plate 14 and are spaced apart from each other, and movable receivers 16 which are arranged in the axial direction and have both end edges fitted between the fixed receivers 15, 15 and which cooperate with the fixed receivers 15 to grip the pilot rope. The fixed receiver 15 has a notch 15a which opens on one side in the direction perpendicular to the axis so as to receive the pilot rope. The movable receiver 16 is equipped with a notch 16a that opens on one side in the direction perpendicular to the axis so as to receive the pilot rope, and a lever 18 that extends on the opposite side to the opening of notch 16a, and by rotating the movable receiver 16 about the axis by approximately 180° relative to the fixed receiver 15, the notches 15a, 16a are aligned so that the pilot rope can be inserted, and after insertion, the lever 18 is turned 180° to clamp the pilot rope together with the fixed receiver 15. When the knob portion 18a at the tip of the lever 18 is pulled out in the extension direction, an engagement piece 18b integral with the knob portion 18a is released from an engagement recess 19 on the base plate 14, allowing the lever 18 to be rotated upright.

[0013] As shown in Figures 4 and 5, the pin cover 5 comprises a cover plate 20 which is pivotally mounted on the base plate 14 by the bolts 17 to the independent bearing 8 so as to be horizontally rotatable, and a plunger 21 which is fixed vertically to the cover plate 20. The cover plate 20 is made of a steel plate bent into a substantially L-shape and has a horizontal mounting portion 20a and a vertical body portion 20b which interferes with the knob head 11b of the opening / closing pin 11 in the extraction position and covers the knob head 11b in the insertion position. The mounting portion 20a comprises a boss 20c for mounting the plunger 21 which protrudes from one corner on one side which does not interfere with the lever 18, and a stopper piece 20d which extends laterally from the diagonal edge of the mounting portion. The plunger 21 comprises a head 21a which penetrates the inside of an external cylinder fixed to the boss 20c and is retracted and urged by a built-in spring, and a protruding shaft 21b which is integrally connected to the head 21a, protrudes from the underside of the mounting part 20a of the cover plate 20, and retracts so as to be able to engage with the edge of the base plate 14 at a corresponding position in both forward and reverse positions of the mounting part 20a. When the head 21a is pinched and pulled out, the protruding shaft 21b retracts, allowing the main body part 20b to rotate around the bolt 17. The main body part 20b faces and covers the tip surface of the pinched head 11b of the opening / closing pin 11 in the pushed-in position, preventing the removal operation and the push-out operation.

[0014] When the opening operation of this hanging pulley 1 is performed by slightly pushing the opening / closing pin 11 from the insertion position and rotating it a predetermined angle around the axis with respect to the closed roller ring 2, the opening / closing pin 11 is pushed out by the compression spring 12 and removed from the hinge cylinders 10a, 10b, so that the connecting hinge 10 is separated and the opening / closing roller 3 is raised, thereby opening the roller ring 2. When the existing wire is inserted into the roller ring 2, the opening / closing roller 3 is laid down, and the closing operation is performed by pushing in the opening / closing pin 11 and rotating it around the axis, the opening / closing pin 11 connects the hinge cylinders 10a, 10b, 10c of the connecting hinge 10, and the roller ring 2 is closed. When the roller ring body 2 is in the closed state, the head 21a of the plunger 21 of the pin cover 5 is raised together with the protruding shaft 21b engaged with one edge of the base plate 14, and the cover plate 20 is rotated around the bolt 17, so that the stopper piece 20d abuts against the fixed receiving plate 15 and is positioned, and the protruding shaft 21b engages with the other edge of the base plate 14 to fix the pin cover 5. In this position of the pin cover 5, the main body 20b covers the gripping head 11b of the opening / closing pin 11, preventing the opening and removal of the opening / closing pin 11. If the closing of the roller ring body 2 is incomplete and the opening / closing pin 11 is in the removal position, the main body 20b interferes with the opening / closing pin 11 and the pin cover 5 cannot be rotated to a position covering the gripping head 11b of the opening / closing pin 11 even if the pin cover 5 is rotated, which inevitably makes the operator aware of the incomplete closing state of the roller ring body 2. The pin cover 5 thus covering the opening / closing pin 11 can be pinched by pinching the head 21a of the plunger 21 and pulling it up together with the protruding shaft 21b, thereby inverting the cover plate 20 and exposing the pinched head 11b of the opening / closing pin 11, and the protruding shaft 21b engages with the other edge of the base plate 14, thereby fixing the pin cover 5. [Explanation of symbols]

[0015] 1. Hanging Wheel 2 Roller ring 3. Laura 4 Rope attachment bracket 5 pin cover 6 Hanging Ring 7 Common Bearing 8 Independent Bearings 9 Connecting hinge 9a Hinge barrel 9b Hinge barrel 9c Connecting bolt 10 Connecting hinge 10a Hinge barrel 10b Hinge barrel 10c Hinge barrel 11 Opening and closing pin 11a Shaft 11b Knob head 12 Compression spring 13 Guide protrusion 14 Base plate 15 Fixed bracket 16 Movable support 15a Notch 16a Notch 17 Volts 18 Lever 18a Knob 18b Engagement piece 19 Engagement recess 20 Cover plate 20a Mounting part 20b Main body 20c Boss 20d Stopper piece 21 Plunger 21a Head 21b Pronged shaft

Claims

1. A sling car for overhead line construction is attached at predetermined intervals to a pilot rope installed between spans, and sends an electric wire to be pulled by hanging the electric wire, a roller ring body including a plurality of rollers connected in a ring shape so that both electric wires are inserted therethrough; and an opening / closing roller, the base end of which is supported by a pivotable bearing capable of changing the relative angle with the adjacent roller, and the tip end of which is supported by a bearing that engages with the adjacent roller so as to be connectable and detachable with each other, in order to open and close the roller annular body and pass an electric wire inside; an opening / closing pin that is engaged with the bearing so as to be movable in the axial direction between an insertion position where the bearing on the tip side of the opening / closing roller is joined and an extraction position where the bearing is separated, and that is biased in the extraction direction by a spring, The bearing at the tip side of the opening / closing roller is equipped with a pin cover which is movable between a closed position in which it engages so as to protrude along the extension of the opening / closing pin, preventing movement to the extraction position, and an exposed position in which it engages so as to disengage from the extension of the opening / closing pin, allowing movement of the opening / closing pin to the extraction position, and which is prevented from moving to the closed position by the opening / closing pin in the extraction position.

2. The pin cover includes a base plate fixed to a bearing on a tip side of the opening / closing roller; a cover plate supported on the base plate so as to be rotatable about an axis perpendicular to an extension direction of the opening and closing pin between a closed position and an exposed position with respect to the opening and closing pin; 2. The sling car for overhead line construction as claimed in claim 1, further comprising: a head portion that protrudes above the base plate and is capable of moving the cover plate; and a plunger that is continuous with the head portion, protrudes below the cover plate and engages with the base plate to prevent the pin cover from moving from the closed position, while being biased toward the protruding side together with the head portion, and that can be detached from the base plate by pulling out the head portion, thereby moving the cover plate to the exposed position.

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