KR-102963770-B1 - METHOD FOR EVALUATING ADHESIVE STRENGTH OF CONDUCTIVE RING

Abstract

The present invention relates to a method for evaluating the adhesive strength of a conductive ring, designed to evaluate the adhesive strength of all conductive rings in the same way even if the specifications of the conductive ring are changed. The present invention provides a method for evaluating the adhesive strength of a conductive ring comprising a ring frame and a conductive fiber combined with the ring frame, the method comprising: (a) preparing a conductive ring specimen in which a fabric wing portion of the conductive ring is cut at regular intervals to form a cut portion; (b) mounting the conductive ring specimen on a dedicated jig; (c) grasping the cut portion of the fabric wing portion with a gripper of the dedicated jig; and (d) pulling the cut portion of the fabric wing portion in a vertical direction to measure the adhesive strength at which the fabric wing portion peels off.

Inventors

• 이호균

Assignees

• 평화오일씰공업주식회사

Dates

Publication Date

20260513

Application Date

20240926

Claims (6)

1. A conductive ring comprising a ring frame and a conductive fiber coupled to the ring frame, (a) a step of preparing a conductive ring specimen in which the fabric wing portions of the conductive ring are cut at regular intervals to form cut portions; and (b) a step of mounting the conductive ring specimen on a dedicated jig; (c) a step of gripping the cutting portion of the fabric wing portion with a gripper of a dedicated jig; (d) A step of measuring the adhesive strength at which the fabric wing portion peels off by pulling the cutting portion of the fabric wing portion in a vertical direction, and In step (b) above, the dedicated jig comprises a specimen position plate on which a conductive ring specimen is positioned, and a specimen upper pressing plate on the upper side of the conductive ring specimen in a positioned state, which is coupled to the specimen position plate by a upper pressing plate fixing part. The above-described dedicated jig is equipped with a horizontal sliding plate to apply force to the above-described conductive ring specimen in a vertical direction, and A method for evaluating the adhesive strength of a conductive ring, characterized by including a sliding plate bottom plate in contact with a horizontal sliding plate.
2. In paragraph 1, A method for evaluating the adhesive strength of a conductive ring, characterized in that, in step (d) above, the vertical pulling speed is 4 to 6 mm/min.
3. In paragraph 1, A method for evaluating the adhesive strength of a conductive ring, characterized in that the above-described dedicated jig is provided to evaluate the ring shape of the above-described conductive ring specimen up to a size of 100 mm.
4. delete
5. In paragraph 1, A method for evaluating the adhesive strength of a conductive ring, characterized by calculating the adhesive strength by dividing the measured value by the width of the conductive ring specimen.
6. In paragraph 1, A method for evaluating the adhesive strength of a conductive ring, characterized in that the adhesive strength is an average of 1 to 5 kgf/cm2.

Description

Method for Evaluating Adhesive Strength of Conductive Ring The present invention relates to a method for evaluating the adhesive strength of a conductive ring, and more specifically, to a method for evaluating the adhesive strength of a conductive ring designed to evaluate the adhesive strength of all conductive rings in the same way even if the specifications of the conductive ring are changed. Generally, when a motor is driven, the voltage induced in the shaft penetrating the motor causes a potential difference between the inner and outer rings of the bearing, resulting in the flow of current through the thin lubricating film. At this time, sparks are generated between the raceway and the balls and rollers of the motor bearing, causing a phenomenon involving noise, heat generation, and vibration in the bearing, which is called shaft current, or electrolytic corrosion. When such frequent electrolytic corrosion occurs, the bearing is damaged, which shortens the bearing's lifespan. Furthermore, malfunctions or sudden stops occur in the motor or load device, leading to unstable motor operation and the inconvenience of having to repair or replace the motor. In particular, for high-voltage or large-capacity motors, significant costs are incurred for repairs such as bearing replacement or replacement with new motors, and the time required to resolve the issue is also excessive, resulting in substantial losses. To solve these problems, a carbon brush, an insulating bearing, and a shaft grounding ring (SGR) can be used as a configuration. However, the carbon brush has a short lifespan due to friction and wear, and because it cannot allow a current exceeding a certain level to flow due to contact resistance, the bearing may be damaged by residual current (C). In addition, while both insulating bearings and SGRs are expensive, they require professional installation as they necessitate disassembling the motor or performing drilling work during the installation process, and there is the inconvenience of having to purchase them to match the motor shaft diameter. In addition to the method described above, prior art capable of preventing separate bearing corrosion is disclosed in Public Patent No. 10-2021-0055465 (published May 17, 2021), which describes a "bearing corrosion prevention device." However, in the case of the aforementioned prior art, the shaft has a shape that encloses it, and since the main body that fixes the grounding brush also maintains contact with the outer surface of the shaft, frictional force with the grounding device occurs when the shaft rotates due to the operation of the motor, which can cause damage or wear to the shaft and prevent problems such as a decrease in rotational force. Furthermore, in the case of the prior art, there is a concern that production and sales costs will be high due to its complex structure; additionally, since the shaft penetrates inwardly, there is the inconvenience of having to use different protection devices depending on the shaft diameter. To solve these problems, a conductive ring for preventing electrochemical corrosion using conductive fibers was devised, which has a simple structure, is relatively inexpensive compared to corrosion-preventing components, can be applied to various motors, and can effectively prevent electrochemical corrosion. The above-mentioned conductive ring for preventing electrolytic corrosion can effectively prevent electrolytic corrosion by expanding the friction area between the conductive fiber part and the ring frame, thereby effectively flowing the generated current to the ground without residual current, and thereby improving the lifespan and efficiency of the motor including the bearing. A conductive ring for preventing electrochemical corrosion using such conductive fibers is disclosed in Korean Patent Publication No. 10-2024-0012218 (published January 29, 2024). This conductive ring is a composite oil seal developed for the first time in Korea by the applicant of the present invention, which prevents galvanic corrosion of the bearing by inducing the current induced in the motor shaft to the motor housing and grounding it. And the above conductive ring is formed by bonding a metal fabric to a metal ring. Figures 1 to 3 show a cross-sectional view in which an example of a conductive ring is installed. Referring to FIGS. 1 to 3, the motor (2) to which the conductive ring (1) is applied has a shaft (3) through which the power of the motor (2) is converted into rotational force and transmitted, and a bearing (4) is provided between the motor housing (21) and the shaft (3) so that the shaft (3) can rotate smoothly. Additionally, on the side through which the shaft (3) passes and is exposed to the outside, there is a spaced-apart space between the motor housing (21) and the shaft (3), and a conductive ring (1) is installed in this spaced-apart space. The above-mentioned conductive ring (1) has a ring shape and is composed of a ring frame