JP4596569B2 - Tension balancer for overhead wire - Google Patents

Description

  The present invention particularly relates to an overhead wire tension balancer used in equipment for maintaining the tension of a train line.

  For overhead lines, especially train lines (suspended / auxiliary suspended / trolley lines), the slackness is due to expansion / contraction due to temperature change, elastic elongation due to creep and trolley line wear, and inclination of the support over time. Because the tension is affected, it was necessary to keep the tension of the train line constant. In addition, it is desirable to perform the adjustment automatically to make it maintenance-free, and there is a spring type in order to reduce the size and weight of the apparatus.

  FIG. 11 shows an example of a tension balancer using the spring type structure. In FIG. 11, an outer middle cylinder 32, an inner middle cylinder 33, and a rod 34 are concentrically received in a cylindrical casing 1 so as to be relatively displaceable in the axial direction. Further, coil springs 35, 36, and 37 having large, medium, and small diameters are provided between the casing 1 and the outer middle cylinder 32, between the outer middle cylinder 32 and the inner middle cylinder 33, and between the inner middle cylinder 33 and the rod 34, respectively. Are concentrically placed. Each of the coil springs 35 to 37 is engaged with each of the inward flange portions 1a, 32a, and 33a fixed to the inner peripheral surface of each outer member at one end in the axial direction, and the other end of each of the inner members. The outer flanges 32b, 33b and 34b are fixed to the outer peripheral surface.

  The outer middle cylinder 32, the inner middle cylinder 33, and the rod 34 are received in the casing 1 at the time of assembly, and can protrude rightward in the drawing. The casing 1 is coupled to a support column 39 through a hook portion 38 that is fixed to the end plate 10 at the rear end, and a support rope 41 that is coupled to a perforated bracket 40 that is fixed to the upper surface of the casing 1. It is supported by the support post 39 via An end of a wire 43 is coupled to the hook 42 attached to the protruding end of the rod 34, and the train line is pulled through the wire 43.

  The tension balancer thus configured has a stroke in which the coil springs 35 to 37 are compressed and deformed to some extent under standard installation conditions, for example, the outer middle cylinder 32, the inner middle cylinder 33, and the rod 34 reach a substantially intermediate position in the use stroke range. It is installed in a state where it protrudes by a length. Therefore, for example, when the temperature drops and the train line shrinks, the rod 34, the inner middle cylinder 33, and the outer middle cylinder 32 further protrude against the repulsive force of the coil springs 35 to 37, respectively, and the temperature rises and the train line is raised. When extended, the rod 34, the inner middle cylinder 33, and the outer middle cylinder 32 are immersed in the casing 1 by the elastic restoring force of the coil springs 35 to 37, so that the displacement due to the expansion and contraction of the train line can be absorbed.

  In addition, as described above, the connection with the support column 39 is performed through the hook portion 38 fixed to the end plate 10. The engagement bolts 44 are arranged, the engagement bolts 44 are protruded inward of the casing 1, and the outer peripheral portions of the end plates 10 are engaged with the protrusion end portions of the engagement bolts 44, so that the wires 43. The casing 1 is supported by the support column 39 against the tension of.

  However, in the conventional overhead wire tension balancer, various parts necessary for the function are individually attached as described above, and there is a problem that the assembly becomes complicated.

In order to solve such a problem and realize simplification of assembly in an overhead wire tension balancer that is made maintenance-free using a compression coil spring, in the present invention, the overhead wire installed in the air A cylindrical casing connected to a support column in order to maintain a constant tension; an inner member that is coaxially received in the casing and can be projected and retracted in an axial direction and connected to the overhead wire; An overhead wire tension balancer having a coil spring coaxially interposed between the casing and the inner member so as to elastically bias the inner member in the immersion direction, the axial direction of the casing on the column side A U-bolt that is inserted in the opening end portion in the radial direction of the casing and is mounted so as to cross the inside of the casing, and a column-side link connected to the column And a member, the strut side connecting member, and as the pair of engaging holes engaging in a state where the U-bolt is inserted.

In this way, the structure that connects the tubular case of the overhead wire tension balancer to the column can be realized with a simple configuration using U-bolts and column-side connecting members , reducing the number of parts and assembly man-hours. I can .

  Embodiments of the present invention will be described in detail below based on specific examples shown in the accompanying drawings.

  FIG. 1 is a side sectional view showing an overhead wire tension balancer to which the present invention is applied. Similar to FIG. 6 shown in the conventional example, one end in the axial direction is connected to a column and the other end is connected to an overhead wire. And used to apply tension to the overhead wire and absorb expansion and contraction. In addition, the same code | symbol is attached | subjected about the part similar to the said prior art example, and the detailed description is abbreviate | omitted.

  In the present embodiment, as in the conventional example, the inner cylinder 3 and the overhead wire connecting hollow rod 4 as inner members are coaxially received in the cylindrical casing 1, and the inner cylinder with respect to the casing 1. 3 and the hollow rod 4 are telescopically projected and retracted in the axial direction. Large-diameter coil springs 6a and 6b arranged in series with each other between the casing 1 and the middle cylinder 3 are similarly arranged between the middle cylinder 3 and the hollow rod 4 with small-diameter coils arranged in series with each other. The springs 7a and 7b are concentrically interposed, and the spring constants of the large-diameter coil springs 6a and 6b are usually smaller.

  Further, the tension balancer is shown in an assembled state in the figure, but the inward and outward flange portions 1a, 3a, and so on as spring seats for locking the axial ends of the coil springs 6a, 6b, 7a, and 7b. 3b and 4b are fixed to corresponding positions of the inner peripheral surface of the casing 1, the outer peripheral surface of the intermediate cylinder 3, and the inner peripheral surface and the outer peripheral surface of the hollow rod 4, and between each pair thereof Are assembled with a predetermined initial load applied thereto. By doing so, the tension change rate of the overhead wire can be arbitrarily coped with by changing the number of the short coil springs arranged in series, which is effective as a countermeasure against the overhead wire flow.

  In the illustrated example, the large-diameter coil springs 6a and 6b and the small-diameter coil springs 7a and 7b are arranged so that the winding directions (right-handed and left-handed) of those adjacent to each other are staggered. By doing so, the eccentric load by buckling at the time of combining a coil spring in series can be avoided as much as possible. However, as shown in the figure, the collars 8 and 9 are interposed between the coil springs 6a, 6b, 7a, and 7b, so that the above-described winding directions can be changed without changing each other. The influence of buckling can be avoided.

  The coil springs 6a, 6b, 7a, and 7b may be wound in a manner that avoids the integral winding in which both ends of the coil end are aligned. By doing so, an eccentric load can be avoided as much as possible. In addition, salt damage resistance can be improved by using aluminum plating for surface treatment.

  An end plate 10 is provided at the opening end of the immersive side (left side in the figure) opposite to the protruding side of the hollow rod 4 of the casing 1 so as to close the opening as shown in FIG. A guide rod 11 having a rectangular cross section is fixed to the central portion of the end surface of the end plate 10 on the inner side of the casing 1 by welding so as to protrude to a substantially middle point of the casing 1. Yes. The hollow rod 4 is formed in a cylindrical shape with a rectangular cross section that has a similar shape into which the guide rod 11 can be inserted. The hollow rod 4 is provided so as to be retractable with respect to the casing 1 while being supported by the guide rod 11. Yes.

  As shown in FIGS. 3 and 4, a closing plate 22 made of a rectangular plate is welded to the opening at the end of the hollow rod 4 in the protruding direction (right side in FIG. 1). It is fixed with. A pair of slots 22 a that are parallel to each other are provided in the central portion of the closing plate 22, and the shackle-like connecting member 12 as an overhead wire connecting member inserted into the slots 22 a is welded to the closing plate 22. It is fixed. As a result, the shackle-like connecting member 12 is integrated with the hollow rod 4 by fixing such as welding, so that a large strength is ensured and a U-shaped one is inserted and attached to the two slots 22a. Therefore, the mounting state is stabilized.

  Block-shaped stoppers 13 are respectively attached to the outer peripheral surface of the protruding end portion of the hollow rod 4 in the vertical direction in the figure. As shown in FIGS. 1 and 3, the stoppers 13 abut against the inward flange portion 3 a of the middle cylinder 3, and the limit of the displacement in the immersion direction in the retracting movement of the hollow rod 4 is restricted. The stopper 13 is attached to the hollow rod 4 by a pin that penetrates both stoppers 13 in the illustrated example, but may be fixed by a screw.

  Further, a support arm 14 extending downwardly beyond the outer peripheral surface of the casing 1 is fixed to the lower stopper 13 in the drawing, and an extension end of the support arm 14 is attached to the extension end of the casing 1. A scale plate 15 serving as a displacement amount visualizing member extending in the axial direction along the outer peripheral surface is fixed. The scale plate 15 is marked with a scale indicating the displacement of the hollow rod 4 relative to the casing 1 in the axial direction. A pointer plate 16 is provided on the outer peripheral surface of the casing 1 as a reference for visually checking the displacement of the hollow rod 4 during inspection. It is fixed.

  In this way, the scale plate 15 for visually observing the amount of displacement of the hollow rod 4 in the protruding direction can be integrally provided on the stopper 13 that restricts the immersion limit of the hollow rod 4. Therefore, since the integration of the scale plate 15 with the hollow rod 4 can be achieved without providing a separate part for fixing the scale plate 15 to the hollow rod 4, the number of parts and the number of assembly steps can be suitably reduced.

  The above-mentioned end plate 10 is attached with a column-side coupling member 17 for coupling to the column 39 as in the conventional example. As shown in FIG. 5, the column-side connecting member 17 is formed by bending a plate material so as to have a U-shaped cross-sectional shape, and is a pair of parallel plates provided at the center of the end plate 10. The slot 10a is attached with a pair of U-shaped parallel extending portions inserted therethrough. In the illustrated example, the column-side connecting member 17 is fixed by welding, for example, in a state of being inserted into the slot 10a and in contact with the end plate 10.

  Bolt support holes 17a for inserting coupling bolts to the column 39 are coaxially provided in the both parallel extending portions of the column side connecting member 17, respectively. Further, a pair of left and right engaging holes 17b that are both parallel extending portions of the column-side connecting member 17 and are exposed to the outer end surface of the end plate 10 while being fixed to the end plate 10 are provided. It has been.

  A pair of through-holes 18 a and 18 b that are coaxial with each other in the radial direction of the casing 1 and are symmetrically provided in a portion corresponding to the attachment position of the end plate 10 in the casing 1 are provided. U-bolts 19 are inserted into the through holes 18 a and 18 b in the radial direction of the casing 1. In addition, each through-hole 18a * 18b is ensured with the strength by the reinforcement member which the hole of the same diameter was provided and was fixed to the outer peripheral surface of the casing 1. FIG. In this manner, both end portions of the parallel extending portion of the U-shaped bolt 19 are supported by the casing 1 and their intermediate portions engage with the locking holes 17b for rotation prevention. Is prevented from rotating.

  Further, as shown in FIGS. 1 and 4, a jig long hole 12 a is provided in the intermediate portion of the overhead wire side shackle-like connecting member 12. At the time of maintenance, for example, the hollow rod 4 can be easily pulled out by inserting a long plate-like jig 21 into the long hole 12a for jig and pulling both ends of the jig 12 in the inserted state. Normally, it is not necessary, so it is only necessary to remove the jig 21 and the maintenance workability is good.

  In the tension balancer thus configured, when installed in the standard state, the middle cylinder 3 and the hollow rod 4 are installed in a state of protruding by a predetermined amount, as in FIG. 11 of the conventional example. The casing 1 is filled with grease for smooth sliding of the middle cylinder 3 and the hollow rod 4.

  Moreover, according to this invention, it is not limited to the shape and attachment method of the above-mentioned stopper 13, Other structures are shown below with reference to FIG.6 and FIG.7. 6 and 7, a stopper locking hole 4a penetrating in the vertical direction in the figure is provided at the projecting end of the hollow rod 4, and a flat L is formed in the stopper locking hole 4a. The letter-shaped stopper 5 is inserted in a penetrating state in which the upper and lower portions are exposed. The upper exposed portion of the stopper 5 in the L shape is locked in the stopper locking hole 4a, and the stopper 5 is prevented from coming off by inserting a pin or the like into the retaining pin hole 5a provided in the lower exposed portion. The

  In this way, instead of the stopper 13, the upper and lower exposed portions of the stopper 5 abut against the inward flange portion 3 a of the middle cylinder 3, and the limit of the immersion direction of the hollow rod 4 is restricted. Moreover, the lower end part of this stopper 5 is extended to the position which faces the outer peripheral surface of the casing 4 instead of the said support arm 14, and the scale plate 15 is fixed to the extension end surface similarly to the above. Therefore, the stopper and the support arm can be assembled without preparing them as separate parts, and the number of parts and the number of assembly steps can be improved. When the end plate 3a is located slightly behind the opening end of the middle cylinder 3 as shown in the illustrated example, the axial direction of the portion corresponding to the downwardly extending portion of the stopper 5 of the middle cylinder 3 The slit 3c is provided so as to avoid interference with the stopper 5 in the movement of the hollow rod 4 in and out.

  In addition, according to the present invention, at the end of the hollow rod 4 in the projecting direction, as shown in FIG. 8, the other peripheral wall portion is cut so as to form a pair of left and right extending pieces 4b. You may make it attach the stopper / occlusion board 24 which formed the board | plate material in the U-shape by bolting, for example. In the stopper / closing plate 24, a closing plate portion 24a corresponding to the closing plate 22 in the above-described embodiment and a stopper portion 24b corresponding to the stopper 13 are integrally formed. Further, the support arm 14 is protruded downward (fixed by welding or the like) on the lower surface of the stopper portion 24b on the lower side in the figure of the stopper / closing plate 24, and the scale plate 15 is mounted in the same manner as in the above embodiment. Install with screws.

  According to this, since the operation of closing the opening of the hollow rod 4 and attaching the scale plate 15 is completed only by attaching the stopper / closing plate 24, the number of parts and the number of assembly steps can be reduced.

  Further, as shown in FIG. 9, a box-shaped stopper 25 formed in a box shape at the end of the hollow rod 4 in the protruding direction may be attached by, for example, a through bolt 26. In the box-shaped stopper 25, the shackle-like connecting member 12 similar to the above may be attached to the bottom wall, and after the shackle-like connecting member 12 is integrated, the end of the hollow rod 4 in the protruding direction is covered. Attach to and bolt.

  As a result, the opening of the hollow rod 4 is closed by the bottom wall portion 25a of the box-shaped stopper 25, and the peripheral wall portion 25b having four surfaces abuts against the end plate 3a of the middle cylinder 3 to act as a stopper. By attaching the support arm 14 and the scale plate 15 as in the illustrated example, the number of parts and the number of assembly steps can be further reduced.

  Forming the closing plate in a box shape can also be applied to the column side, and as shown in FIG. 10, the column side end of the guide rod 11 is penetrated to the end plate 10 and fixed by welding. The box-shaped connecting member 27 may be attached to the outward projecting end portion with the through bolt 26 in the same manner as described above. In addition, the column-side shackle-like connecting member 28 formed in the same manner as the shackle-like connecting member 12 is fixed and integrated in the same manner.

  Further, a plate-like detent block 29 extending in the lateral direction is fixed to the end plate 10 at an upper position in the figure of the box-shaped connecting member 27 on the end surface on the outer side of the casing. The anti-rotation block 29 is provided with engagement holes 29a at two locations facing the left and right sides of the box-shaped connecting member 27, and each of the engagement holes 29a has the same as described above. The U-shaped bolt 19 is inserted. In this way, the end plate 10 is prevented from rotating with respect to the casing 1.

  Even in the case shown in FIG. 10, each opening may be closed by attaching a box-shaped stopper 25 and a box-shaped connecting member 27 to each outward end of the hollow rod 4 and the guide rod 11. Therefore, it is not necessary to separately attach a blocking plate for bird damage countermeasures, and only the number of man-hours for attaching each connecting member is required, and the reduction in the number of parts and the number of assembling steps can be improved.

  As described above, according to the present invention, it is not necessary to use a separate closing member for closing the opening, so that the number of parts and the number of assembling steps can be reduced. It is possible to close the opening without using a separate part as a countermeasure against bird damage caused by the intrusion. Since the stopper that determines the limit of the immersing direction of the inner member also serves as a member for viewing the amount of displacement in the protruding direction, it is not necessary to attach each member separately, and the number of assembly steps can be reduced. By providing a jig insertion hole for inserting a jig used for drawing, the number of parts and the number of assembly steps can be further reduced.

The side sectional view showing the tension balancer for overhead wires to which the present invention is applied. The enlarged end view seen from the arrow II line of FIG. The expanded end view seen from the arrow III line of FIG. The principal part disassembled perspective view which shows the overhead wire side connection part of this tension balancer. The principal part disassembled perspective view which shows the support | pillar side connection part of this tension balancer. The principal part longitudinal cross-sectional view which shows another embodiment of a stopper. FIG. 7 is an exploded perspective view of main parts of FIG. 6. The principal part disassembled perspective view which shows another embodiment of a stopper. The principal part disassembled perspective view which shows another embodiment of an overhead wire side connection part. The principal part disassembly assembly perspective view which shows another embodiment of a support | pillar side connection part. The sectional side view which shows the conventional tension balancer for overhead wires.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casing 3 Middle cylinder 4 Hollow rod 5 Stopper, 5a Pin hole 1a * 3a Inward flange part 3b * 4b Outward flange part 6a * 6b Large diameter coil spring 7a * 7b Small diameter coil spring 8 * 9 Collar 10 End plate 11 Guide rod 12 Shackle-shaped connecting portion 13 Block-shaped stopper 14 Support arm 15 Scale plate 16 Pointer plate 17 Shackle-shaped connecting portion, 17a Bolt support hole, 17b Engagement hole 18 Non-rotating block, 18a / 18b Through hole 19 U-shaped bolt 21 Jig 22 Blocking plate, 22a Slot 24 Stopper / blocking plate 25 Box-shaped stopper, 25a Bottom wall portion, 25b Peripheral wall portion 26 Through bolt 27 Box-shaped connecting member 28 Column-side shackle-shaped connecting member 29 Non-rotating block, 29a Engagement hole 32 Outside Middle cylinder 33 Inner middle cylinder 32a, 33a Inward flange portion 34 Rod 32b 3b, 34b outward flange portion 35, 36, 37 coil spring 38 hook 39 post 40 bracket 41 supporting ropes 42 hook 43 wire 44 engages bolt

Claims (3)

In order to maintain a constant tension of the overhead wire installed in the air, a cylindrical casing connected to the support column, and the overhead wire that is coaxially received in the casing and can be projected and retracted in the axial direction. An overhead wire tension balancer having an inner member to be connected, and a coil spring coaxially interposed between the casing and the inner member to elastically bias the inner member in an immersion direction,
A U-bolt that is inserted in the radial direction of the casing at the axial opening end of the casing on the column side and attached so as to cross the inside of the casing; and a column-side coupling member that is coupled to the column. Have
A tension balancer for an overhead wire, wherein the strut-side connecting member is provided with a pair of engagement holes that engage with the U-bolt inserted . Claims wherein the strut-side connecting member is formed by bending a plate material in a U-shaped cross section, wherein the pair of engaging holes in a pair of parallel extending portion of the U-shaped are provided, respectively The tension balancer for overhead wires according to 1 . The overhead wire tension balancer according to claim 1, wherein the engagement hole is a long hole.

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