Inverted hydraulic head for connecting electrical wires

Abstract

The present invention provides an inverted hydraulic head for electrical wire connection that prevents the intrusion of foreign matter such as burrs, extends the period during which airtightness can be maintained, eliminates corrosion, and prevents the occurrence of corrosion marks. [Solution] The hydraulic head for connecting electric wires is an inverted type, with a compression section 1 for connecting electric wires positioned lower down and a cylinder section 2 for applying hydraulic pressure positioned higher up, and a ram with a permanent magnet embedded in it so that the sliding die 6 moves in accordance with the hydraulic pressure.

Description

Technical Field

[0001] The present invention relates to the structure of a hydraulic head for compression connection of an electric wire and a sleeve, within a hydraulic machine for connecting transmission lines.

Background Art

[0002] Conventionally, the connection of transmission lines has been performed by compression connection. In this case, the hydraulic head is placed in a so-called upright position with a compression part at the upper part and a cylinder part at the lower part. The electric wire and the sleeve are inserted from an openable upper part (referred to as a die gate), and after compression, the die gate is opened to take out the compression-connected electric wire.

Prior Art Documents

[0003] Document Number 1: Japanese Utility Model Publication No. 50-114683

Summary of the Invention

Problems to be Solved by the Invention

[0004] The conventional compression head had the following drawbacks.

[0005] (a) When compressing, compression burrs occur on the sleeve, and foreign substances including the burrs fall and are bitten into the inside of the cylinder where airtightness is required. The foreign substances damage the cylinder surface. As a result, airtightness is broken, oil leakage occurs, and it becomes unusable.

[0006] (b) Since the hydraulic head for electric wire connection is a device used in electric wire extension work, it is stored in a warehouse after the extension work is completed. In a climate or weather where condensation occurs during the storage period, condensation occurs. When condensation occurs, the condensed water drops and stays, corroding the inner surface of the cylinder. If the storage period is long, corrosion marks remain, breaking airtightness and making it unusable.

[0007] (h) When the wires are compressed and connected, they become longer, making it necessary to remove the die gate and take out the wires. When the die gate is set, the strength of the wire connection head is significantly reduced. This invention was made to solve these problems. [Means for solving the problem]

[0008] Regarding issue (i), the generation of burrs is unavoidable during the compression connection work of electrical wires. As a countermeasure, a debris shield called a "scraper" has been installed as a conventional solution, but it has not been sufficient. Therefore, as shown in Figure 1, the compression section is placed at the bottom, and the compression work is performed from top to bottom, so that even if burrs are generated, they fall off and do not enter the cylinder section which requires airtightness.

[0009] To address problem (b), positioning the head inverted allows condensation to be drained by gravity, eliminating the formation of corrosion marks.

[0010] To address problem (c), by adopting an inverted design and eliminating the die gate, the compression head can be integrated, stress distribution can be improved, and the operating period of the head can be extended. This product is exclusively for prefabricated construction methods that compress wires with sleeves at the wire ends.

[0011] To enable inverted compression, the die that directly compresses the wire and sleeve needs to move with the ram, and a powerful permanent magnet is attached to the ram to grip the die. The use of magnets is the key to this invention. [Effects of the Invention]

[0012] Conventional compression heads for electrical wire connections have the cylinder section, which requires airtightness, located at the bottom, making them susceptible to foreign objects such as burrs getting caught. By making this an inverted type, the intrusion of foreign objects such as burrs can be prevented, and the period during which airtightness can be maintained can be extended. The same applies to storage; while condensation is unavoidable, the resulting condensation can be quickly drained by gravity. This eliminates corrosion and prevents the formation of corrosion marks.

[0013] The inverted wire connection compression head lacks a die gate, which is an outlet for the compressed wire, and therefore cannot be used for wire connections in the middle of a span. However, it is suitable for compression work at the ends of wires in prefabricated construction methods. By eliminating the die gate, the so-called "cantilever beam" is eliminated, and the compression section is integrated, thereby distributing stress. This stress distribution extends the lifespan of the compression head. [Brief explanation of the drawing]

[0014] [Figure 1] This is a perspective view of the main unit. The die is installed in the compression section. [Figure 2] This is a half-cross-sectional view. The ram that generates pressure is visible, and the die is held in place by a strong permanent magnet. [Figure 3] This is a perspective view of the die installed inside the main unit. The die is a conventional 100-ton die, but the top and bottom are reversed, with the lower die used as a sliding die and the upper die used as a fixed die. [Figure 4] These are the internal component "RAM" and the permanent magnet installed within it. [Explanation of Symbols] 1 Compression section 2 Cylinder section 3 Opening 4 Male couplings 5 Female Coupling 6. Sliding die 7 Fixed dice 8 Ram 9 Permanent Magnets

Claims

1. This is an inverted hydraulic head for connecting electrical wires, with the first compression section for connecting the wires positioned lower down and the second cylinder section for applying hydraulic pressure positioned higher up.

2. An inverted hydraulic head for electrical wire connection, with 8 rams embedded with 9 permanent magnets so that 6 sliding dies move in accordance with the hydraulic pressure.

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