JPH08214429A - Come along - Google Patents

Abstract

PURPOSE: To prevent the generation of scuffing owing to strong friction while making possible lightning by composing two-piece come along bodies of a composite material, in which ceramic is dispersed in an aluminum alloy, and constituting an arm of a high-strength light alloy or FRPs. CONSTITUTION: A come along body 2 is formed by extruding a green compact, in which ceramic powder having mean grain size of approximately 250μm or less is mixed with an aluminum alloy having mean grain size of approximately 100μm at the rate of approximately 10-25%, at a high temperature. A high- strength light alloy such as the aluminum alloy, a magnesium alloy or the like or glass or carbon fiber-reinforced FRPs are used as an arm 3. The two- piece come alongs 2 are clamped firmly by an electric wire by a hinge pin 4 and clamping members 5. The aluminum alloy, in which ceramic is dispersed, is employed as the come along bodies 2, thus preventing the generation of scuffing even by strong friction at a time when a wedge is pulled in, then repeatedly using the come along bodies 2 owing to a light material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cam along used for overhead line construction of overhead power transmission lines.

[0002]

2. Description of the Related Art A conventional cam along is shown in FIGS. The cam along consists of a halved wedge 1 for holding an electric wire, a halved cam along body 2 into which the wedge 1 is inserted, and an arm 3 attached to the cam along body 2. The outer peripheral surface of the wedge 1 is a tapered surface, and the inner peripheral surface of the cam along body 2 is also a tapered surface that matches the outer peripheral surface of the wedge 1. For this reason,
When the wedge 1 holding the electric wire is inserted into the cam along body 2 and the arm 3 is pulled, the wedge 1 is drawn into the cam along body 2 along the tapered surface, and the electric wire can be strongly tightened.

As shown in FIG. 4, the split cam along body 2 has one side connected with a hinge pin 4 and the other side fastened with a fastening member 5 such as a bolt nut. It can be opened and closed by removing the tightening member 5.

This cam-along is used when an electric wire is extended between steel towers and then pulled up so as to have a predetermined sag.

[0005]

Since the conventional cam alloy is made entirely of steel, it is heavy and difficult to handle.
Aluminum alloy was studied to reduce the weight, but wedges cannot be made of aluminum alloy from the viewpoint of strength.
Since the Cam-along body is heavy, if this part is made of high-strength aluminum alloy, the weight can be significantly reduced.
However, if the cam-along body is made of an aluminum alloy, there is a problem that the cam-along body is damaged due to strong friction when the steel wedges are pulled in, and the cam-along body is damaged, so it could not be put to practical use.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a cam-along which solves the above-mentioned problems, and has a structure having an electric wire holding groove on the inner peripheral surface and a tapered surface on the outer peripheral surface. In a cam along body that consists of a split wedge, a split cam along body with an inner peripheral surface that is a tapered surface into which this wedge is inserted, and an arm attached to the cam along body, the cam along body is made of aluminum alloy. The arm is made of a composite material in which ceramics are dispersed, and the arm has a high strength light alloy or FRP.
(Fiber reinforced plastic).

As the aluminum alloy of the composite material forming the cam-along body, A6061 alloy, A2014 alloy, A7075 alloy and the like can be used. Powders of the following substances can be used as the ceramics of the composite material. Oxide: Al ₂ O ₃ , ZrO ₂ , TiO ₂ , MgO,
SiO ₂ , Cr ₂ O ₃ . Nitride: AlN, TiN, ZrN, Si ₃ N ₄ , Cr
N, BN. Carbide: SiC, TiC, ZrC, CrC ₂ , B
₄ C. Borides: ZrB ₂ , TiB ₂ , Cr ₂ B ₃ . It may be a compound or mixture of these substances.

The volume content of ceramics in the composite material is 1
% Or more and less than 50% is preferable. If the volume content of the ceramics is less than 1%, wear due to wedges is remarkable, and repeated use is not possible. On the other hand, if it exceeds 50%, the composite material becomes brittle and the come-along body may be broken during use. A more preferable range of the volume content of ceramics is 10 to 25%.

The average particle size of the ceramics of the composite material is preferably 500 μm or less. When the average particle size of the ceramics exceeds 500 μm, the ceramics and the aluminum alloy are not sufficiently bonded to each other and are easily broken when subjected to tensile stress. A more preferable range of the average particle size of ceramics is 250 μm or less.

Next, as a high-strength light alloy forming the arm, an A7000 series alloy (A7075, A7N01, etc.)
Or A2000 series alloys (A2014, A2017, A
Aluminum alloy such as 2024) or high strength magnesium alloy can be used. Further, as the FRP constituting the arm, glass fiber reinforced plastic, carbon fiber reinforced plastic, or the like can be used.

[0011]

[Function] A composite material in which ceramics are dispersed in an aluminum alloy has excellent wear resistance and high hardness. The cam-along body formed of such a composite material does not cause galling even due to strong friction when the steel wedge is pulled in. Moreover, since the base material of this composite material is an aluminum alloy, the specific gravity is significantly smaller than that of steel, and the weight of the cam along body can be greatly reduced. Further, by constructing the arm with a high-strength light alloy or FRP, the weight of the arm can be significantly reduced. Therefore, a lightweight and easy-to-handle cam along can be configured.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 and 2 show an embodiment of the present invention. FIG. 1 shows a state in which the cam along body 2 is opened. 3 is an arm, 4 is a hinge pin, and 5 is a tightening member. Since the wedge is the same as the conventional one, the illustration is omitted. In this cam-along, the cam-along main body 2 is made of a composite material in which ceramic powder is dispersed in an aluminum alloy, and the arm 3 is made of an aluminum alloy.

The composite material constituting the cam along body 2 was manufactured as follows. First, an aluminum alloy (A6061) powder having an average particle size of 100 μm and SiC having various average particle sizes
The powder was mixed with the powder in the composition (volume ratio) as shown in Table 1 for 1 hour with a ball mixer, and then the powder was put into a mold and pressed with a pressing force of 1 t / mm ² to produce a green compact. This green compact was heated to 570 ° C. and hot extruded at a pressing force of 2 t / mm ² to obtain an extruded material having a substantially semicircular cross section. This extruded material has T
After the heat treatment, the test piece was sampled from the extruded material, and the following test was performed.

Hardness measurement: Measured with a Vickers hardness meter. Wear Test: by Tokyo Testing Machine Inc. Large ultra formula quickly abrasion tester, a rotary disk SKH3 (H _R C60), the rotational speed of 1.64 m / sec, friction distance 200 meters, the final load 6.3k
The friction width of each test piece was determined under the condition of g. Tensile test: Measured with an Instron type universal testing machine.

On the other hand, the cam-along main body 2 is made of the extruded material and a commercially available aluminum alloy (A7075-T) is used.
The arm 3 was manufactured in 6) and the cam along as shown in FIGS. 1 and 2 was assembled. An actual use test was conducted on this come along. For the sake of comparison, the same test was performed on the S55C cam along (conventional product). The above test results are shown in Table 1.

[0016]

[Table 1]

In the above examples, the case where SiC powder was used for the ceramics of the composite material was explained, but the same results can be obtained by using other ceramics powders as described above. Also, since the characteristic required for the arm is mainly tensile strength, the arm is made of F instead of aluminum alloy.
It is also possible to use RP or the like.

[0018]

As described above, the cam alloy according to the present invention is extremely lightweight because the cam alloy body is made of a composite material in which ceramics are dispersed in an aluminum alloy, and the arms are made of an aluminum alloy. , Easy to handle. Further, since the cam-along body is made of the above composite material and has extremely excellent wear resistance, it does not cause galling even if it is strongly rubbed by wedges, and can be repeatedly used.

[Brief description of drawings]

FIG. 1 is a plan view showing a cam along open state according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view showing a conventional cam along in a closed state.

FIG. 4 is a right side view of the cam along in FIG.

[Explanation of symbols]

 1: Wedge 2: Cam along body 3: Arm 4: Hinge pin 5: Tightening member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Jun Kato 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Kenjiro Yamagata 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Inventor Tomomi Soeda 5-12 Izumigaoka-cho, Toki City, Gifu Prefecture (72) Inventor Masaji Agawa 4-115 Kyomachi, Tajimi City, Gifu Prefecture

Claims (3)

[Claims] 1. A halved wedge having an electric wire gripping groove on the inner peripheral surface and a tapered outer peripheral surface, and a halved cam along which the inner peripheral surface has a tapered surface into which the wedge is inserted. In a cam along body comprising a main body and an arm attached to the cam along body, the cam along body is made of a composite material in which ceramics are dispersed in an aluminum alloy, and the arm is a high strength light alloy or F
Come along which is made of RP (fiber reinforced plastic). 2. The volume content of ceramics in the composite material is 1
% Or more and less than 50%, The come along according to claim 1. 3. The composite material ceramics has an average particle size of 50.
The come along according to claim 1 or 2, which has a diameter of 0 µm or less.