JPS5833762B2 - shoe chain extension car - Google Patents

Description

[Detailed description of the invention] The present invention relates to a shoe chain extension vehicle.

Recently, prefabricated overhead wires have become popular.

Prefabricated overhead wires are constructed by cutting the cable in advance according to the span length and then extending and installing the prefabricated cable with retaining clamps attached to both ends.There is less on-site work, so the overhead wire work can be labor-saving.

However, when installing multi-conductor line cables for high power using prefabricated overhead wires, if the tension history of each cable is not the same up to the time of overhead wiring, the amount of dip for each cable will be different, and in extreme cases, cables may There was a risk of contact.

Therefore, it is necessary to appropriately manage the tension that acts on the cable during wire extension.

However, the conventional shoe chain rolling stock was not equipped with a means for detecting the tension acting on the cable.

The present invention has been made based on the above-mentioned circumstances, and provides a shoe chain rolling car having tension detection means.

The present invention will be described in detail below with reference to the drawings.

The pedestal 2 that supports the shoe chain drum 1 has mounting frames 3 on both sides of its bottom with a U-shaped cross section perpendicular to the drum axis.
3 is provided with its opening facing down.

The base 4 has hollow members 4a, 4a with a rectangular cross section on both sides thereof, and the shafts 6 of the plurality of wheels 5 arranged in the hollow portion in a manner distributed in the longitudinal direction of the members are attached to the side walls of the members 4a in a manner to be described later. The shafts 6 pass through each other, and both ends of the shafts 6 are pivotally supported by both side walls of the mounting frames 3, 3.

The manner in which the shaft 6 penetrates the side wall of the hollow member 4a is as follows.

That is, on both side walls of the hollow member 4a, an elongated hole 7a having a width approximately equal to the shaft diameter in the longitudinal direction of the member is provided for the shaft of the wheel at the end on the cable feed side, and a long hole 7a having a width approximately equal to the shaft diameter in the longitudinal direction of the member is provided. 7b to 1e are provided with circular diameters 7b to 1e that are larger in diameter than the pillar axis facing the cable sending side.

By doing as above, the pedestal 2 can move in the lateral direction,
Rotation around the axis of the wheel on the cable feeding side can be performed.

A bracket 8 is provided at each end of the mounting frames 3, 3 on the cable sending side, and each of these brackets is provided with an axis parallel to the longitudinal direction of the base 4 at the cable sending side end of the base 4. The output shaft of a hydraulic cylinder 9 is connected to the upper surface of the bracket 8, and the hydraulic cylinder 1 is provided with its axis perpendicular to the output shaft of the hydraulic cylinder 9 on the upper surface of the end of the base 4.
0 output shaft is connected.

In the figure, 11 indicates a cable guide.

Although not shown in the drawings, the drum 1 has a shoe chain formed by endlessly connecting a plurality of flake shoes each having a concave surface that engages with the cable and a convex surface that engages with the spiral groove 1a on the circumferential surface of the drum. When wound, the cable C is engaged with the spiral groove formed when the recess of the shoe chain is wound around the drum 1, and is braked.

FIG. 4 is a diagram showing the principle of the present invention, and shows a state in which a cable C is extended diagonally upward from the drum 1 and a tension force F is applied thereto.

At this time, the horizontal component of the force F is Fl, the vertical component is F2, and the vertical component F2 is upward, and the load F3 due to the weight of each member constituting the rolling stock on the mounting frame 3 is vertical. Component force F2
only decreases.

Hydraulic cylinders 9 and 10 receive horizontal component force F1. The force F3-F2 is detected by pressure changes within the cylinder.

Here, since the load F3 is known, the horizontal force F,
Vertical force F1. F2 will be detected, from which the tension F can be determined.

In addition, the component force F1. Calculation of the force F from F2 is performed by A/D conversion of the pressures of the hydraulic cylinders 9 and 10 using a microcomputer or the like.

As described above, in the shoe chain extension vehicle of the present invention, the tension applied to the cable can be constantly monitored and managed while extending the cable, so that, for example, the tension history of prefabricated cables of multi-conductor track can be aligned. This is easy and can solve problems caused by uneven tension history.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a front view of its base, FIG. 3 is a side view of the embodiment, and FIG. 4 is a schematic diagram showing the principle of the invention. 1... Drum, 2... Frame, 3... Mounting frame, 4...
...Base, 4a...Hollow member, 5...Wheel, 6...
・Axis, γa...Long hole, 7b-7e...Circular hole, 8・
... Bracket, 9, 10... Hydraulic cylinder.

Claims (1)

[Claims] 1 A plurality of wheels are provided on both sides of the bottom surface of the pedestal that supports the drum around which the shoe chain is wound, and a plurality of wheels are provided on both sides of the base on which the pedestal is placed, and wheels are located at the cable feeding side ends of the middle pedestal of the wheels. A long hole in the longitudinal direction of both members of the base for engaging the shaft of the object and a circular hole with a larger diameter for the shaft of the wheel on the cable sending side for engaging the shaft of another wheel are provided, and the base A hydraulic cylinder having an output shaft perpendicular to the drum axis and extending in the longitudinal direction of the base, and a hydraulic cylinder having an output shaft perpendicular to the drum axis and perpendicular to the longitudinal direction of the base are attached to the end of the cable sending side. A shoe chain extension car, characterized in that the output shafts of the cylinders are respectively connected to both side members of the mount.