JP2001025118A - Heat generation detector for strain clamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect abnormality of high temperature positively by filling and temporarily setting a shape memory alloy strip-shaped sensor at a notched section in the axial direction provided near an electric wire outlet end, and pressing it against the inserted wire for integration. SOLUTION: A shape memory alloy strip-shaped sensor 3 is prepared, a notched section is filled and temporarily set at a sensor end. An electric wire E is fitted into the groove part 1b from the side and a cover 2 is inserted for crimping the wire. Internal high-temperature abnormalities can be detected positively. By applying colored urethane paint to the front of the shape memory alloy strip-shaped sensor 3 and applying tar epoxy paint having superior weather resistance for the surface opposed to a mounting base and the electric wire E, electric corrosion can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat generation detecting device capable of detecting occurrence of abnormal heat generation in a dovetail wire electric wire clamping clamp.

[0002]

2. Description of the Related Art When an abnormal heat is generated in an aluminum tube into which an electric wire is inserted and crimped, a wire breakage often occurs inside the tube, and an early countermeasure is required. An example in which a shape memory alloy is used to detect the occurrence of abnormal heat generation is disclosed in Japanese Patent Application No. 9-1.
39286. This reference relates to a branch line fitting, but first points out the following. Even if the inside of the aluminum tube becomes abnormally high temperature, the surface is not necessarily high temperature, and the heat generation distribution inside becomes particularly high near the opening of the wire insertion hole.

[0003]

According to the above-mentioned reference, a sensor hole is formed in the middle of the main line and the branch line on the branch line take-out side of the aluminum pipe main body based on this point, and a rectangular shape memory alloy sensor is inserted therein. It is intended to be inserted. Since this disclosed example is extremely effective, it was attempted to use a sensor made of the same alloy also as a retention clamp, but in this case, a space for drilling a sensor insertion hole as in the case of a branch line fitting is provided at the end face. I can't get it. Further, electrolytic corrosion due to dissimilar metals occurs between the sensor and the electric wire. This is a problem that needs to be solved.

[0004]

A strip-shaped sensor made of a shape memory alloy is prepared. Near the wire exit end of the anchoring clamp, an incision in the axial direction that can be filled at the end of this sensor is made, the sensor is temporarily filled with an adhesive or the like, and then crimped and integrated with the inserted wire. Since the tip of the sensor is located at the highest temperature due to heat generation, abnormality can be reliably detected. A resin-based urethane coating is applied to the front surface of the strip-shaped sensor made of a shape memory alloy, and a tar epoxy coating is applied to the sensor mounting base and the surface facing the electric wire to prevent electrolytic corrosion.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. One end of the anchor 1 is an anchor 1a, and the other end is an insertion groove 1b for the electric wire E. The groove 1b is a dovetail groove, and a lid 2 is provided. Separately, a rectangular sensor 3 made of a shape memory alloy is prepared, and a notch capable of filling the end of the sensor is provided near the inner end of the groove 1b. This cut is temporarily fixed at the sensor end, and the other part of the sensor is projected. Wire E is groove 1
b. Insert the lid 2 from the side, and press-fit. The sensor 3 is pressed and surrounded by an aluminum material as shown in FIG. 3 near the end of the groove, that is, at the highest temperature portion, so that it is reliably exposed to the internal high temperature. The sensor 3 is bent by this, but the relative angle phase of each member is adjusted so that the sensor 3 can be easily detected from a distant position. FIG. 4 is a front view of a retaining clamp provided with a sensor coated with a resin-based paint. When rainwater accumulates in the gap between the sensor and the electric wire,
When electricity is supplied to this, a short circuit occurs between the electric wire E made of aluminum and the sensor 3 made of the Ni-Ti material, and electric corrosion occurs due to a potential difference between dissimilar metals. In particular, the sensor mounting base 4 and the surface 5 facing the electric wire E are easily eroded. In order to prevent this, a colored urethane paint 6 is applied to the front surface of the strip-shaped sensor 3 made of a shape memory alloy, and a tar epoxy paint 7 having excellent weather resistance is applied to the mounting base 4 and the surface 5 facing the electric wire E. Thus, the colored urethane paint surface faces outward and can be detected from a distance. In particular, the portions that are particularly susceptible to electrolytic corrosion are coated with a tar epoxy coating, so that the coating does not easily peel off.

[0006]

According to the present invention, in a dovetail-type retention clamp, a strip-shaped sensor is inserted into a notch on the inner surface of the tip of the clamp and crimped and integrated with an inserted electric wire, so that the sensor reliably responds to an internal high temperature and can detect a high temperature. I do. Since the resin-based paint is applied to the sensor, electric corrosion can be prevented. Colored urethane paint is applied to the confirmation surface of the sensor, and highly weather-resistant tar epoxy paint is applied to the sensor base and the electric wire facing surface, which are particularly susceptible to electrolytic corrosion.

[Brief description of the drawings]

FIG. 1 is a front view of a retaining clamp.

FIG. 2 is a plan view of the same.

FIG. 3 is a sectional view of a wire insertion groove.

FIG. 4 is a front view of a retaining clamp provided with a sensor coated with a resin-based paint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Retention clamp 1a Retention part 1b Groove part 2 Lid 3 Sensor 4 Sensor mounting base 5 Sensor facing surface 6 Urethane paint 7 Tar epoxy paint E Electric wire

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takao Seki 2-2-2, Yoyogi, Shibuya-ku, Tokyo East Japan Railway Company (72) Inventor Takanori Higaki 6-5 Minamishinagawa, Shinagawa-ku, Tokyo No. 19 Inside Sanwa Tekki Co., Ltd. (72) Inventor Hiroshi Tajima 6-5-19 Minamishinagawa, Shinagawa-ku, Tokyo F-term inside Sanwa Tekki Co., Ltd. 5G367 EA02 EB03 EF02 EF06

Claims (2)

[Claims] 1. A holding clamp having a handle at one end and a crimping part of a dovetail-type electric wire at the other end, wherein a rectangular notch is provided in the axial direction on the inner surface near the opening end of the dovetail groove, and a shape memory alloy is used. One end of a strip-shaped sensor is filled and attached to the cut, and the exposed portion of the sensor is set so as to be detectable at a predetermined high temperature by applying electricity after inserting and crimping an electric wire. apparatus. 2. The clamp according to claim 1, wherein a urethane paint is applied to the front surface of the strip sensor made of a shape memory alloy, and a tar epoxy paint is applied to a mounting base and a surface facing the electric wire. Heat generation detection device.