JPH08168130A - Clamp for cable removing machine - Google Patents

Abstract

PURPOSE: To obtain a clamp for cable removing machine in which the cable clamping force is enhanced greatly. CONSTITUTION: The clamp for a cable to be removed is mounted on the frame of a cable removing machine. In the clamp, the opposing clamp faces 7a, 8a of a pair of vertical clamping boards 7, 8 are waved along the direction of a cable inserted between them. The clamp faces 7a, 8a are provided, at the top and bottom of the wave thereof, with a first small protrusion 10a having semiarch cross-section and a second small protrusion 11a having rectangular cross-section while being shifted from each other so that they do not face each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slicing machine for a residual cable which is left unused in a laid state in an underground conduit for a communication line, and a cable installed in the slicing machine. Of the clamp device.

[0002]

2. Description of the Related Art Communication line cables installed in underground pipes
For example, replace the cable with an optical fiber cable,
In order to remove unused cables, a slicing machine that pulls out the cables has been developed.

Examples of this cable removing machine include:
JP-A-4-12609 and JP-A-5-6433.
The prior art described in Japanese Patent Publication No. 0, etc. is known, and the removing machine generally has a clamp device for gripping a cable to be removed, a hydraulic cylinder device for clamp operation, and a pulling direction of the clamp device. Equipped with a hydraulic cylinder device for towing that reciprocates the required stroke along the line, the clamp device of the removal machine installed in the manhole holds and pulls the end of the removal cable pulled out from the pipeline. It is configured to be pulled out.

[0004] In this case, the clamp device equipped in the removal machine generally has a pair of upper and lower grip substrates, and the clamp surfaces of the grip substrates facing each other are formed in a corrugated shape and inserted between the grip substrates. When sandwiching the cable to be
The cable is compressed and deformed into a wave shape to prevent it from slipping.

[0005]

By the way, the communication cable to be removed has a relatively hard structure in which a large number of conductive wires (core wires) are enclosed in a resin tube for coating, If the clamping surface is simply formed into a corrugated shape as in a clamping device, the locking action on the crimping surface between the clamping surface of the gripping substrate and the cable is weak and a sufficient cable is formed.
I can't get the grip of the bull.

Therefore, even if the removal machine itself is designed to have a pulling pulling ability of 10 to 20 tons maximum, the pulling ability of the removal machine is not sufficient because the gripping force of the cable is not sufficient. However, there was a problem that the cable could not be pulled out frequently during the removal work.

The present invention has been proposed to solve the above-mentioned problems, and it is an object of the present invention to provide a removing machine in which the gripping force of the cable is greatly enhanced so that the original pulling ability of the removing machine itself can be maximized. An object of the present invention is to provide a clamp device.

[0008]

As a means for achieving the above object, a clamp device according to the present invention has a pair of sandwiching substrates for sandwiching a cable to be pulled out from above and below, and the sandwiching substrates face each other. The clamp surface to be bent is formed in a wavy shape along the cable direction,
The present invention is characterized in that a first small protrusion having a semi-circular cross section and a second small protrusion having a substantially rectangular cross section are formed on the clamping surface of the recess by displacing the facing positions so that they do not face each other. To do.

[0009]

In such a clamp device according to the present invention, when the cable to be pulled out is inserted between the pair of upper and lower sandwiching substrates facing each other for crimping and clamping, the entire crimping portion of the cable is compressed and deformed into a waveform. The gripping force is improved as a result.

At this time, since the first small protrusion is formed in a semicircular arc shape in cross section, the cable core and the cable coating are integrally crimped and clamped without cutting the cable coating when crimping and clamping. Further, since the second small protrusion is formed to have a substantially rectangular cross section, the second small protrusion bites into the cable cover during crimping and clamping, and further into the cable core to prevent the cable from being displaced when the cable is pulled.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 to 3, reference numeral 1 denotes a main frame of the removing machine, and the main frame 1 includes two lower left and right frames 1a extending horizontally and two upper left and right frames 1b. And are framed by the end plates 1c and 1d fixed to the front and rear.

The frame 1 of the main body of the removing machine is supported at a required height position by supporting legs 2 which are erected at four positions on the lower frame 1a, and the length of the supporting leg 2 is adjusted. When the removal machine body frame 1 is installed in the manhole C and the cable A is pulled out, the clamp device 5 provided on the body frame 1 is used as a pulling target. The cable A can be located at the same height level as the underground pipe D in which it was laid.

A pair of left and right rods 3, 3 are horizontally installed on the frame 1 of the main body of the removing machine, straddling between the end plates 1c, 1d fixed to the front and rear, and the horizontal lots 3, 3 on the left and right are provided.
As a guide, a pair of left and right hydraulic cylinder devices 4 for pulling and pulling, which reciprocate in the front-rear direction over the required stroke L.
4, a clamp device 5 for gripping the cable A to be removed across the left and right hydraulic cylinder devices 4, 4.
Is provided.

In the clamp device 5, a pair of upper and lower sandwiching substrates 7 and 8 constituting a clamp portion are provided on a support frame 6 which is laid across the left and right hydraulic cylinder devices 4 and 4, and a sandwiching substrate below the sandwiching substrates 7 and 8. 7 is fixedly provided on the support frame 6, and the upper sandwiching substrate 8 is set on the support frame 6 so as to be vertically moved by a required height H by a hydraulic cylinder device 9 for clamping operation.

The cable A to be removed is inserted between the pair of sandwiching substrates 7 and 8 facing each other.
This cable A can be inserted and the removal machine main frame
Although not particularly shown in the drawings, the end plates 1c and 1d fixed before and after the frame 1 are provided with openings for inserting cables, respectively.
Further, the support frame 6 is also provided with an opening 6a as shown in FIG.

The upper and lower clamping substrates 7, 8 of the clamp device 5 are
As shown in the enlarged view of FIG. 4, the opposing clamping surfaces 7
The center of the upper sandwiching substrate 7 is convex and the center of the lower sandwiching substrate 8 is concave so that a and 8a have a wavy shape along the insertion direction of the cable A. In the present invention, the first small protrusion 10 having a semi-circular cross section is provided with respect to the clamping surfaces 7a and 8a having the corrugated convex and concave surfaces.
a, 10b and second small protrusions 11a, 11 having a substantially rectangular cross section
b and 11c are formed so as to project over the entire width of the clamp surfaces 7a and 8a.

In the illustrated embodiment, the first and second
The small protrusions 10a to 11c each have a protrusion height h of 1
It is formed to 0 mm, and the clamp surface 7a of the upper substrate 7 is
The second small projections 11a, 1 are provided on the central convex surface and one concave surface.
1b is formed with three first small protrusions 10a protruding from the other concave surface. Further, the clamp surface 8a of the lower substrate 8 is
The first small projection 10b and the second small projection 11c are formed on the central concave portion.
In this case, the first small protrusion 10b and the second small protrusion 11c projectingly formed on the lower clamp surface 8a are the small protrusions projectingly formed on the upper clamp surface 7a. 11a, 11b, and 10a are formed so as to protrude from each other so as not to face each other.

In the embodiment constructed as described above, the removal machine main body frame 1 is installed in the manhole during the removal work of the remaining cables, and the removal machine main body frame 1 is provided on the cable drawing side. Attach the tip of the protruding reaction force rod 14 to the cable
It is brought into contact with the end of the bull laying conduit B.

In this state, the end of the cable A exposed from the end of the conduit B is inserted between the upper and lower clamping substrates 7 and 8 of the clamp device 5, and a hydraulic cylinder for clamping operation from a hydraulic source (not shown). The pressure oil is supplied to the device 9 so that the end of the cable A is clamped by the set required crimping force. Next, the hydraulic cylinder device 4 for pulling and pulling from the hydraulic source
4, pressure oil is supplied to control the hydraulic pressure, and the clamping device 5 is moved by the expansion / contraction operation of the hydraulic cylinder devices 4 and 4 as shown in FIG.
Stroke L from the solid line position shown in FIG. 3 to the chain line position
By reciprocating between them, the required traction force is applied to the cable A in the outward stroke, and the cable A is pulled out from the pipe line B.

At this time, according to the present invention, the clamp device 5
Cable A which is crimped and clamped between the upper and lower clamping substrates 7 and 8
The entire sandwiched portion is compressed and deformed into a waveform.

In this case, the clamp surface 7 of the upper substrate 7
a. Three first and second small protrusions 10 projectingly formed on a.
a, 11a, 11b, two first and second small protrusions 10b formed on the clamp surface 8a of the lower substrate 8 so as to project.
Since 11c is formed so as to protrude from each other so that the two do not face each other, the curved surface of the cable A that has been compressed and deformed into a corrugated shape is further provided with the first and second small protrusions 10.
The bending motion is performed in two steps by a to 11c.

At this time, since the first small protrusion is formed in a semi-circular arc shape in cross section, the cable core and the cable coating are integrally crimped and clamped without cutting the cable coating during crimping and clamping. Further, since the second small protrusion is formed to have a substantially rectangular cross section, the second small protrusion bites into the cable cover during crimping and clamping, and further into the cable core to prevent the cable from being displaced when the cable is pulled.

As a result, since the clamping force of the cable A by the clamp device 5 is greatly strengthened, the pulling traction ability originally possessed by the removing machine can be maximized, and during the removing work,
The rate of occurrence of undrawable situations is greatly reduced.

[0024]

As described above, according to the present invention, the cable clamping force of the clamp device equipped in the removal machine is greatly enhanced, and the original pulling ability of the removal machine itself is maximized. By being able to exert it to the limit, there is an effect that it is possible to eliminate the inconvenience such as the conventional situation in which the situation in which the drawing cannot be performed is caused at the time of the drawing construction.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a removing machine to which a clamping device of the present invention is applied.

[Figure 2] Front view of the removal machine

[Figure 3] Plan view of the removal machine

FIG. 4 is a cross-sectional view showing a cross-sectional shape of a clamp surface which is a main part of the present invention.

[Explanation of symbols]

 1 Frame of removal machine 2 Support leg 3 Rod 4 Hydraulic cylinder device for pulling / pulling 5 Clamping device 6 Support frame 7 Lower clamping substrate 8 Upper clamping substrate 9 Hydraulic cylinder device for clamp operation 10 Semi-arc-shaped cross section 1 small protrusion 11 second small protrusion having a substantially rectangular cross section A cable to be removed B cable laying pipeline

Claims (1)

[Claims] 1. A clamp device for gripping a cable to be extracted, a hydraulic cylinder device for clamping operation, and a towing hydraulic cylinder for reciprocating the clamp device along a pulling direction in a frame of a removal machine body. In the cable removing machine equipped with a device, the clamping device has a pair of clamping substrates that clamp the cable to be pulled out from above and below, and the clamping surfaces of the clamping substrates facing each other in the cable direction. The first small protrusion having a semi-circular cross section and the second rectangular cross section are formed on the corrugated convex and concave clamping surfaces.
A clamping device for a cable removing machine, characterized in that the small protrusions are formed by projecting by displacing the facing positions so that they do not face each other.