JP2011011663A - Tension display type turn buckle for overhead line - Google Patents

Abstract

The present invention provides a tension display type turnbuckle that is robust and stable in function, can easily check the indication value of tension visually from the ground in the daytime, can easily adjust the tension, and can be manufactured at low cost.
A tension display type turnbuckle 1 includes a main body 2 that can be expanded and contracted in the axial direction, a spring case 3 connected to one end of the main body 2, a spring 4 provided therein, and a main body 2 and a spring accompanying the expansion and contraction thereof. There is provided tension display means 5 for displaying the relative displacement with respect to the case 3 so as to be visible as a change in tension of the overhead wire W. The main body 2 includes an outer cylinder 6, an inner cylinder 7, and a rod 8 that are sequentially screwed telescopically, and expands and contracts in the axial direction by forward and reverse rotation around the axis of the inner cylinder 7. The spring case 3 receives the outer cylinder 6 so as to be relatively displaceable in the axial direction and not rotatable around the axis, and the outer end in the axial direction is connected to the retaining member. The spring 4 is interposed between the spring case 3 and the outer cylinder 6.
[Selection] Figure 1

Description

  The present invention relates to a tension display type turnbuckle interposed between an end of an overhead line and a retaining member such as a utility pole in order to adjust the tension of the overhead line such as a train line.

Among the facilities that make up the train line, which is an overhead line, there are a suspended overhead line and a trolley line whose tension affects the contact with the pantograph. The trolley wire in direct contact with the pantograph is configured such that the tension can follow the temperature change by the automatic tension adjusting device, but the automatic tension adjusting device is often not provided for the suspension line. However, since the tension drop of the suspension wire also indirectly affects the pantograph separation rate, it is necessary to periodically check the tension and adjust it to a predetermined value. A turnbuckle is provided on the suspension side of the suspension line, and the tension can be adjusted by adjusting the length of the rod. In this case, the tension is adjusted by interposing a tension meter between the turnbuckle and the suspension line, and confirming the numerical value of the tension indicated by the tension meter while expanding and contracting the turnbuckle. Without using a tension meter, the adjustment may be easily performed depending on the intuition of the operator.
On the other hand, a tension sensor that measures the tension of a train line such as a suspension line and generates an electrical signal, a transmission means that sends the tension signal to the ground, a monitoring means that monitors the tension signal transmitted from the transmission means, and a tension signal Patent Document 1 discloses an overhead wire tension measurement / variation device provided with a tension variable means for appropriately changing tension according to the above. Examples of the tension sensor include a strain gauge type or a magnetostriction type, and examples of the tension variable means include the use of a conventional manual wire turnbuckle or an electric wire turnbuckle.
A tension meter-integrated turnbuckle is disclosed in Patent Document 2. This is a metal ring attached in series in the longitudinal direction of a tightening tool that pulls a pair of opposing bolts with a turnbuckle together, and a strain gauge attached to the ring. It is said that a particularly great effect can be expected when it is used for the purpose of work, for example, adjustment of overhead wire tension of an electric wire or the like.

JP-A-6-72191 JP 7-294350 A

Of the conventional tension adjustment methods described above, the method using a tension meter is a relatively large-scale construction, and therefore must be performed during a time when trains are not operated at night. Become. Needless to say, relying on the operator's intuition is undesirable.
The overhead wire tension measurement / variation device described in Patent Document 1 has not been put into practical use until now, because it may involve relatively large costs for the equipment.
The tension meter integrated with the turnbuckle described in Patent Document 2 involves a relatively large cost in equipment for enabling the tension to be monitored from the ground, and in order to use this turnbuckle as a permanent equipment. There is a problem to be solved in terms of strength, and this has not been put into practical use until now.
Therefore, the invention according to this application has no significant structural change from the conventional equipment, and is therefore robust and stable in function. It is an object of the present invention to provide a tension display type turnbuckle that can adjust the tension and can be manufactured relatively inexpensively.

Hereinafter, the present invention will be described with reference to the accompanying drawings, but the present invention is not limited thereto.
The tension display type turnbuckle 1 of the invention according to this application for solving the above problems includes a main body 2 that can be expanded and contracted in the axial direction, a spring case 3 connected to one end of the main body 2, and a spring case 3 The spring 4 provided inside and expands and contracts substantially linearly according to the tension load of the overhead wire W, and the relative displacement between the main body 2 and the spring case 3 as the spring 4 expands and contracts is visually observed as a change in the tension of the overhead wire W. And tension display means 5 for displaying in a possible manner. The main body 2 includes an outer cylinder 6, an inner cylinder 7, and a rod 8 that are sequentially screwed into a telescopic manner. The axially outer end of the rod 8 is connected to the overhead wire W, and It can be expanded and contracted in the axial direction by reverse rotation. The spring case 3 receives the axially outer end of the outer cylinder 6 of the main body 2 within a predetermined range so as to be relatively displaceable in the axial direction and not rotatable about the axis, and the axially outer end is connected to the retaining member. The spring 4 is interposed between the spring case 3 and the outer cylinder 6.
The tension display means 5 of the tension display type turnbuckle 1 includes a displacement detection mechanism 10 that detects a relative displacement between the outer cylinder 6 and the spring case 3, and a displacement amplification mechanism 11 that amplifies the displacement detected by the displacement detection mechanism 10. The tension display mechanism 12 that displays the amplified displacement in a visible manner as a change in the tension of the overhead wire W can be provided.
The displacement detection mechanism 10 in the tension display type turnbuckle 1 is fixed to the outer cylinder 6, and the measuring shaft 10a protruding from the outer cylinder 6 in the direction orthogonal to the axis and the measuring shaft 10a fixed to the spring case 3 are relatively movable. A casing 10b to be received and a driven member 10c that is provided in the casing 10b so as to be linearly reciprocable and that is connected to the measurement shaft 10a and is driven by the measurement shaft 10a can be provided.
The displacement detection mechanism 10 in the tension display type turnbuckle 1 includes a measurement shaft 10a fixed to the outer cylinder 6 and protruding from the outer cylinder 6 in the direction orthogonal to the axis, and a measurement shaft 10a fixed to the spring case 3 and receiving the measurement shaft 10a in a relatively movable manner. A casing 10b and a rack gear 10c provided in the casing 10b so as to be linearly reciprocable and connected to the measurement shaft 10a and driven by the measurement shaft 10a are provided. The displacement amplifying mechanism 11 is meshed with the rack gear 10c and rotated. The tension display mechanism 12 includes a gear group supported in the casing 10b, and a pointer 12a fixed to the output shaft 11a of the gear group, and a rotation angle of the pointer 12a fixed to the outside of the casing 10b. And a display board 12b to which a scale 12c indicating the tension value of the overhead wire W corresponding to is attached.
The outer cylinder 6 in the tension display type turnbuckle 1 is provided with a spring receiving rod 6b extending in the axial direction and having a spring receiving rod 6d at the tip at the outer end in the axial direction. Is a cylindrical portion 3a that opens to the inner end in the axial direction, closes the outer end, and receives the spring receiving rod 6b of the outer cylinder 6 in an axially movable manner, and a puller extending outside the closed end. 3b, and the cylindrical portion 3a of the spring case 3 is fitted to the outer periphery of the end of the outer tube 6 on the open end side so as to be relatively movable in the axial direction and non-rotatable around the shaft. And an inner peripheral flange 3d that holds the spring 4 between the spring receiving rod 6d facing the spring receiving rod 6d of the spring receiving rod 6b inserted into the cylindrical portion 3a. it can.

  According to the tension display type turnbuckle of the invention according to this application, the structure is slightly extended and retracted by incorporating a spring in the portion bearing the load, and a large structural change with the conventionally used turnbuckle. Therefore, it is small, robust, stable in function, and can be manufactured relatively inexpensively. Since the tension display means is configured to display a tension value corresponding to the expansion and contraction of the spring, the mechanism is simple, and the tension value can be reliably displayed. In the daytime, the numerical value of tension can be confirmed relatively easily from the ground, and the tension can be adjusted easily on the spot. No major night construction is required.

The turnbuckle which concerns on this invention is shown, (A) is a top view, (B) is a front view. FIG. 2 is a plan view of a part of the turnbuckle of FIG. 1. It is a front view of a part of the turnbuckle of FIG. FIG. 2 is a side view of a part of the turnbuckle of FIG. 1. It is VV sectional drawing in FIG.

Embodiments of the present invention will be described with reference to the drawings.
The tension display type turnbuckle 1 is interposed between an end portion of the overhead wire W such as a suspension wire and a retaining member such as a utility pole (not shown), and adjusts the tension of the overhead wire W by expansion and contraction in the axial direction. It is a turnbuckle.

  The turnbuckle 1 includes a main body 2 that can be expanded and contracted in the axial direction, a spring case 3 that is connected to one end of the main body 2, and a spring case 3 that is substantially linear according to the tension load of the overhead wire W A spring 4 that expands and contracts, and a tension display means 5 that displays the relative displacement between the main body 2 and the spring case 3 accompanying the expansion and contraction of the spring as a change in the tension of the overhead wire W so as to be visible.

  The main body 2 includes an outer cylinder 6, an inner cylinder 7, and a rod 8 that are sequentially screwed into a telescopic manner. The outer cylinder 6 includes an axially inward (rightward in FIG. 1) cylindrical portion 6a and an axially outward (leftward in FIG. 1) spring receiving rod 6b, and a screw on the inner periphery of the cylindrical portion 6a. 6c. The inner cylinder 7 has an outer peripheral screw 7a screwed into the inner peripheral screw 6c of the outer cylinder 6, and has a screw 7b in the opposite direction on the inner periphery. The rod 8 has an outer peripheral screw 8a that is screwed to the inner peripheral screw 7b of the inner cylinder 7 on the inner end side in the axial direction, and a puller 8b that is connected to the overhead wire W at the outer end. Therefore, the main body 1 can be expanded and contracted in the axial direction by rotating the inner cylinder 7 forward and backward around the axis, and thereby the tension of the overhead wire W can be adjusted.

  The outer cylinder 6 includes a spring receiving rod 6b at the axially outer end of the cylinder portion 6a. The spring receiving rod 6b extends in the axial direction from the center of the cylindrical portion 6a and has a spring receiving rod 6d at the tip. A detent ring 9 having a plurality of sliding protrusions 9a (FIG. 5) on the outer periphery is fixed to the annular end surface of the cylindrical portion 6a around the spring receiving rod 6b.

  The spring case 3 includes an axially inner cylindrical portion 3a and an axially outward puller 3b. The cylindrical portion 3a is opened to the inner end side in the axial direction, the outer end is closed, and the puller 3b extends outward from the closed end. The cylindrical portion 3a receives the spring receiving rod 6b of the outer cylinder so as to be relatively movable in the axial direction. The cylindrical portion 3a includes a sleeve 3c fitted to the outer periphery of the end portion of the outer cylinder 6 and an inner peripheral flange 3d on the open end side. The inner periphery of the sleeve 3c is formed in a deformed cross section that matches the outer peripheral shape of the anti-rotation ring 9 of the outer cylinder. Therefore, the spring case 3 can move relative to the outer cylinder 6 in the axial direction, but cannot rotate around the axis.

  A plurality of disc springs 4 are inserted into the cylindrical portion 3 a of the spring case 3. The spring 4 is held between the spring receiving rod 6 d of the outer cylinder 6 and the inner peripheral flange 3 d of the spring case 3.

  The tension display means 5 includes a displacement detection mechanism 10 that detects the relative displacement between the outer cylinder 6 and the spring case 3, a displacement amplification mechanism 11 that amplifies the displacement detected by the displacement detection mechanism, and the amplified displacement as an overhead line W. A tension display mechanism 12 that displays the change in tension as visible.

  The displacement detection mechanism 10 includes a measurement shaft 10a, a casing 10b, and a driven member 10c. The measurement shaft 10 a is fixed near the outer end of the outer cylinder 6 and protrudes from the outer cylinder 6 in the direction orthogonal to the axis. The casing 10b is fixed to the outer surface of the spring case 3, and receives the measuring shaft 10a so as to be relatively movable. The rack gear as the driven member 10c is provided in the casing 10b so as to be linearly reciprocable, connected to the measuring shaft 10a, and driven by it.

  The displacement amplifying mechanism 11 includes a gear group supported in the casing 10b so as to mesh with the rack gear 10c and rotate.

  The tension display mechanism 12 includes a pointer 12a fixed to the output shaft 11a of the gear group which is the displacement amplification mechanism 11, and a display plate 12b fixed outside the casing 10b. A scale 12c indicating the tension value of the overhead wire W corresponding to the rotation angle of the pointer 12a is attached to the display board 12b.

  The turnbuckle 1 is installed by connecting a rod puller 8b to the overhead wire W and a spring case puller 3b to a retaining member (not shown). By rotating the inner cylinder 7 forward and backward, the main body 2 is expanded and contracted, and the tension of the overhead wire W is adjusted. For example, when the main body 2 is contracted, the tension of the overhead wire W increases. As the tension increases, the spring 4 is compressed, and an axial relative displacement proportional to the tension load occurs between the outer cylinder 6 and the spring case 3. The spring 4 is selected as a spring constant that does not interfere with the constant tension support of the overhead wire W. With the relative displacement between the outer cylinder 6 and the spring case 3, the measuring shaft 10a moves in the casing 10b together with the rack gear 10c. This movement is about 7.5 mm at the maximum in the illustrated embodiment, but is converted into a rotational movement by the gear group 11, amplified and transmitted to the pointer 12 a. The pointer 12a indicates the current tension value of the suspension line W on the display board 12b.

  In addition, it can also be set as the structure displayed as it is on the scale attached | subjected linearly on the display board, without converting the linear motion of the measuring shaft 10a with respect to the casing 10b into a rotational motion.

DESCRIPTION OF SYMBOLS 1 Turnbuckle 2 Turnbuckle main body 3 Spring case 3a Tubular part 3b Puller 3c Sleeve 3d Inner peripheral flange 4 Spring 5 Tension display means 6 Outer cylinder 6a Tubing part 6b Spring receiving rod 6c Inner peripheral screw 6d Spring receiving rod 7 Inner cylinder 7a Outer peripheral screw 7b Inner peripheral screw 8 Rod 8a Outer peripheral screw 8b Puller 9 Non-rotating ring 9a Sliding projection 10 Displacement detecting mechanism 10a Measuring shaft 10b Casing 10c Driven member (rack gear)
11 Displacement amplification mechanism (gear group)
11a Output shaft 12 Tension display mechanism 12a Pointer 12b Display board 12c Scale W Overhead wire

Claims (5)

A turnbuckle that is interposed between the end of the overhead wire and the retaining member and adjusts the tension of the overhead wire by expansion and contraction in the axial direction,
A main body that has an outer cylinder, an inner cylinder, and a rod that are sequentially screwed into a telescopic, and whose axial outer end is connected to an overhead wire and that can be expanded and contracted in the axial direction by forward and reverse rotation around the axis of the inner cylinder When,
A spring case in which the axially outer end of the outer cylinder is received within a predetermined range so as to be relatively displaceable in the axial direction and not rotatable around the axis, and the axially outer end is connected to the retaining member;
A spring that is interposed between the outer cylinder and the spring case and expands and contracts substantially linearly according to the tension load of the overhead wire;
A tension display type turnbuckle for overhead wire, comprising tension display means for visually indicating the expansion and contraction of the spring, that is, the relative displacement between the outer cylinder and the spring case as a change in tension of the overhead wire. The tension display means includes a displacement detection mechanism that detects a relative displacement between the outer cylinder and the spring case;
A displacement amplification mechanism for amplifying the displacement detected by the displacement detection mechanism;
The tension display type turnbuckle for an overhead wire according to claim 1, further comprising a tension display mechanism that displays the amplified displacement in a visible manner as a change in tension of the overhead wire. The displacement detection mechanism is fixed to the outer cylinder, and a measuring axis that protrudes from the outer cylinder in the direction perpendicular to the axis line;
A casing that is fixed to the spring case and that receives the measuring shaft in a relatively movable manner;
The overhead wire tension display type turnbuckle according to claim 2, further comprising a driven member that is provided in the casing so as to be linearly reciprocable and is connected to the measurement shaft and driven by the measurement shaft. The displacement detection mechanism includes a measuring shaft fixed to the outer cylinder and protruding from the outer cylinder in the direction perpendicular to the axis, a casing fixed to the spring case and receiving the measuring axis in a relatively movable manner, and a linear reciprocating movement in the casing. And a rack gear connected to the measurement shaft and driven by the measurement shaft,
The displacement amplification mechanism includes a gear group supported in the casing so as to mesh with the rack gear and rotate.
The tension display mechanism includes a pointer fixed to an output shaft of the gear group, and a display plate fixed to the outside of the casing and provided with a scale indicating a tension value of an overhead wire corresponding to the rotation angle of the pointer. The tension display type turnbuckle for an overhead wire according to claim 2. The outer cylinder includes a spring receiving rod that extends in the axial direction at the outer end in the axial direction and has a spring receiving rod at the tip.
The spring case has a cylindrical portion that opens to the inner end in the axial direction, closes the outer end, and receives the spring receiving rod of the outer cylinder in the axial direction so as to be relatively movable in the axial direction, and a pull extending to the outside of the closed end. With hand,
The cylindrical portion of the spring case has an open end, a sleeve that is relatively movable in the axial direction around the outer periphery of the end of the outer cylinder, and that is non-rotatable around the axis, and a spring receiver that is inserted into the cylindrical portion. 5. An overhead wire tension indicator according to claim 1, further comprising an inner peripheral flange that holds the spring between the spring receiving rod of the rod and facing the spring receiving rod. Type turnbuckle.

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