JPS63178708A - Cable hanging equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Application of the Invention> The present invention relates to an overhead wire apparatus, and particularly to an improvement in its wire extension tension detection mechanism.

In this specification, the "overhead line winch" and the "overhead line extending machine" are collectively referred to as the "overhead line apparatus." In addition, ``Wire J'' refers to electric wires used in overhead line construction.
This is a broad concept that includes messenger wires, traction wires, etc.

<Prior Art> As a conventional overhead line system, for example, those shown in FIGS. 8 and 9 are known.

The one shown in FIG. 8 is a double drum type "overhead wire winch" which is equipped with a pair of winding drums 2 on the pulling side A and the tail side B for winding and controlling the wire 1. A plurality of guide grooves 3 are formed in the wire 2 to guide the wire 1 being wound. The wire extension tension detection mechanism is provided with a torque meter T on a drive shaft 6 that transmits the driving force of a power source 5 to each winding drum 2 via a gear box 4, and detects the torque applied to the power source 5 by this torque meter T. This method detects the wire tension. still,
In the figure, 7 is a gear.

What is shown in FIG. 9 is a single-drum type "overhead wire winch" equipped with a capstan 10, and its wire extension tension detection mechanism includes a strain gauge 12 attached to a drive shaft 11 that supports and drives the capstan 10. The strain gauge 12 detects the torque applied to the drive shaft 11 and detects the wire tension. Furthermore, Circular 14 is as follows:
It is a drive mechanism.

In addition, these "overhead line winches" are used to
Both the winding drum 2 and the capstan 10 have a so-called "cantilever structure" in order to facilitate replacement of the winding drum 2 and the capstan 10.

<Problems to be Solved by the Invention> However, in the above-mentioned double drum type "overhead line winch", due to its structure, the drive shaft 6 on the power source 5 side is unavoidable.
As a result, the torque detected by the torque meter T includes the mechanical resistance of the entire "device", especially the mechanical resistance of the gearbox 4 itself. Moreover, this mechanical resistance is affected by the viscosity of the lubricating oil, which changes depending on the outside temperature and usage time, and the gear 7.
It constantly changes depending on the "familiarization" state of the driving parts, etc. Therefore, when these mechanical resistances become a large ratio to the necessary wire drawing tension, it becomes very difficult to accurately detect the actual wire drawing tension. In this case, the winding drum 2 is also influenced by the back tension from the reel winder (not shown) on the tail side B, that is, the winding drum 2 is driven by the back tension, so no hack tension is required. If the ratio is large to the wire drawing tension, accurate detection of the actual wire drawing tension becomes even more difficult.

Furthermore, the wire tension detection mechanism of the single-drum type "catenary line winch" does not have the problem of mechanical resistance as in the double-drum type "catenary line winch" due to the mounting position of the strain gauge 12, but it does not have the problem of back tension. The impact is inevitable.

Furthermore, since the winding surface of the capstan 10 has a slope, that is, the winding diameter differs within the capstan 10, the torque acting on the drive shaft 11 may vary depending on the entry point of the wire 1 even with the same wire tension. It was also insufficient in that it would be different.

In this way, all conventional methods detect the wire tension indirectly, so they are easily influenced by things that intervene in the middle and back tension, making it difficult to accurately detect the actual wire tension. Stock up on things. However, in recent overhead line work, it has become necessary to accurately maintain a predetermined wire tension, and accurate detection of the wire tension actually acting on the wire has become a major issue.

In view of these circumstances, the present invention aims to provide an overhead wire apparatus equipped with a wire tension detection mechanism that can accurately detect actual wire tension by directly detecting wire tension from the wire. .

<Means for Solving the Problems> As a means for achieving the above-mentioned object, the present invention provides an overhead line apparatus having a pair of winding drums on the traction side and the tail side for winding and controlling the wire. A freewheel that rotates freely according to the progress of the wound wire is provided at the end of the winding drum on the wire side of at least one of the pulling side and the tail side, and this freewheel and the winding drum on the other side are provided. An idle wheel is pressed against the middle part of the wire that is in tension with the drum so that the wire is slightly bent, and a load cell is used to detect the reaction force that the idle wheel receives from the wire in response to the wire tension. The main idea is to directly detect the wire tension acting on the wire.

<Function> That is, the wire slightly bent by pressing the idle wheel forms a contact point with the idle wheel, a contact point with the freewheel, and a contact point with the other winding drum, respectively, so to speak. The wire tension is directly detected from the wire by the reaction force generated from the wire to the idle wheel due to the "triangle of force".In addition, in this case, a freewheel is provided on one of the winding drums, and this freewheel is used to wind the drum. The wire is rotated freely as the wire progresses, and the actual wire tension at the wire stretching location and the wire stretching tension at the detection location where an idle wheel or the like is provided to detect the wire tension are substantially equal to each other. are made to be almost the same, only by subtracting the negligible difference in the rotational frictional resistance of the idle wheel, so that the actual wire tension can be detected directly and accurately.

<Embodiment> Hereinafter, embodiments of the overhead line system according to the present invention will be described in FIGS. 1 to 7.
This will be explained with reference to the figures. In the following description, parts common or similar to the conventional system and each embodiment are indicated by the same reference numerals, and redundant description will be omitted. Furthermore, in the following description, upward means the direction of arrow Y, and downward means direction of arrow X.

1 to 3 show a first embodiment.

This overhead line apparatus 20 is a double-drum type "overhead line winch" that is equipped with a pair of winding drums 2 for winding and controlling the wire 1 on the traction side and on the bottom side B.

As a wire extension tension detection mechanism, freewheels 21 and 22 are provided on each of the winding drum 2a on the pulling side A and the winding drum 2b on the trailing side B at the end on the wire entry side. Each freewheel 21, 22 is attached to the drive shaft 6 via a bearing 23 so as to rotate freely in accordance with the advancement of the wound wire l.

In addition, the freewheel 22 of the winding drum 2b on the tail side B
The wire 1 is then wound around the guide groove 3 of the winding drum 2a on the pulling side A, and the wire 1 is placed at the midpoint of the wire 1 which is under tension at the lower part between the winding drums 2a and 2b.
The idle wheel 24 is pressed against the idle wheel 24 so as to be slightly bent downward, and the load cell R is connected to the idle wheel 24. Note that the load cell R is fixed to a part of the frame body 25 of the overhead wire device 20. Further, 26 in FIG. 3 is a key for integrating the drive shaft 6 and the winding drum 2.

Therefore, in the wire tension detection mechanism in this overhead wire apparatus 20, the wire tension actually acting on the wire is determined by the contact point P with the idle wheel 24 formed by the wire that is slightly bent by being pressed downward by the idle wheel 24. ,
It is directly detected from the wire by the reaction force F from the wire to the idle wheel 24 generated by a so-called "triangle of force" formed with the contact points P2 and P3 with each freewheel 21 and 22 as vertices. .

Moreover, freewheel 2 is attached to each winding drum 2a, 2b]
, 22 are provided respectively, and the free wheels 21 and 22 are rotated freely according to the progress of the wound wire, thereby detecting the actual wire drawing tension and the wire drawing tension at the wire drawing portion 27. Since the wire stretching tension at the detection portion 28 where the idle wheel 24 etc. are provided is set as a difference only by the rotational frictional resistance of the idle wheel 24, which can be practically ignored, the actual wire stretching tension can be directly and This means that it can be detected accurately.

FIG. 4 shows a second embodiment.

This embodiment is characterized in that the wire tension is detected at the upper part of the winding drums 2a, 2b, whereas in the first embodiment, the wire tension is detected at the lower part of the winding drums 2a, 2b. That is, the wire 1 entering the overhead line device 31 is forcibly wound around the free wheel 21 of the winding drum 2a on the pulling side A by the presser wheel 30 which freely rotates as the wire 1 advances. Freewheel 21 and winding drum 2 on bottom side B
The wire 1 is kept under tension at the upper part between the freewheels 22 in b, and the idle wheel 24 is pressed against the middle point of this tension part so that the wire 1 is slightly bent upward.

In this way, being able to perform detection even at the upper portion has the advantage of providing a degree of freedom in designing the "overhead line system."

In the first and second embodiments described above, both the winding drums 2a and 2b are provided with a "freewheel", but this is not a limitation, and the extension of the wire extension portion 27 is not limited to this. Of course, the "freewheel" which does not cause a difference between the wire tension and the wire tension at the detection portion 28 may be omitted. Specifically, in the first embodiment, the wire 1 enters the overhead line device 20 at an angle, so that the wire 1 normally hardly comes into contact with the freewheel 21 on the traction side A, and in the second embodiment, the freewheel 21 is on the traction side A. ,
This is the freewheel 22 on the rear side B.

5 and 6 show a third embodiment.

The overhead line system 40 of this embodiment is a single-drum type "overhead line winch" equipped with a capstan 10, and the wire 1 is attached to a free wheel fixed to a part of the frame body 13 of the overhead line system 40 via a load cell R. 41 and then around the capstan 10.

Therefore, in the wire drawing tension detection mechanism in this overhead wire apparatus 40, the tension applied to the freewheel 41 in the direction of arrow Z is detected by the load cell R in accordance with the wire drawing tension actually acting on the wire 1. The wire tension is detected more directly than the wire 1.

FIG. 7 shows a fourth embodiment.

This embodiment is a modification of the third embodiment, and the major difference is that the load cell R is connected to a wire under tension at the lower part between the freewheel 41 and the capstan 10, as in the first embodiment. Idle wheel 2 at the midpoint of 1
4 is pressed, and the load cell R is connected to this idle wheel 24.

Although each of the above embodiments relates to an "overhead line winch", it is not limited to these, and it goes without saying that the wire drawing tension detection mechanism shown in each embodiment can be applied to a "wire drawing machine". .

<Effects of the Invention> As explained above, the overhead wire device according to the present invention provides idle control to the tensioned portion of the wire via the freewheel that can freely rotate as the wound wire advances. Formed by pressing the wheel
Since the wire tension is directly detected using the "force triangle," there are no fluctuation factors that would otherwise be inevitable when detecting indirectly, and the influence of back tension can be avoided, making it extremely accurate. It has the excellent effect of being able to detect the wire tension.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing the main parts of the overhead line system according to the first embodiment, FIG. 2 is a schematic side sectional view taken along the arrowed line ■-■ in FIG. 1, and FIG. FIG. 4 is a schematic side sectional view corresponding to FIG. 2 according to the second embodiment; FIG. A schematic plan view showing the main parts of the overhead line system according to the embodiment, FIG. 6 is a schematic side view seen from the direction of the arrow ■ in FIG. 5, and FIG. 7 shows the main parts of the fourth embodiment. The schematic side view and FIGS. 8 and 9 are schematic plan views showing the main parts of a conventional overhead line system, respectively. 1.-1--Wire 2--Wound drum 24--Idle wheel A--Traction side B--1 butt end side F-...-Reaction force R-----To the load cell @ Ku1to> 2 ( ) Kubo

Claims (1)

[Scope of Claims] In an overhead wire system comprising a pair of winding drums on a towing side and a tail side for winding and controlling a wire, at least one of the winding drums on the towing side or the tail side. A freewheel is installed at the end of the winding drum on the wire entry side and rotates freely as the wound wire progresses, and tension is created between this freewheel and the winding drum on the other side. It consists of an idle wheel that presses the wire so that it is slightly bent at the midpoint of the wire, and a load cell that detects the reaction force that this idle wheel receives from the wire according to the wire tension, and measures the wire tension that is actually acting on the wire. An overhead wire system comprising a wire extension tension detection mechanism that directly detects the reaction force received by an idle wheel from the wire.