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Sliding contact wire refers to the sliding contact wire body and the matching current collector assembly. Usually, users' understanding of sliding contact wire quality is often limited to the body itself, and they consider the current collector to be a consumable item that can be replaced with a new one when worn out.
Table of Contents
1. While maintaining the original technical features, design a contact conduction mechanism in the current collector for when the carbon brush is worn out, introducing current to the alarm device.
2. The spring tension of the alarm carbon brush is slightly increased compared to other carbon brushes, sacrificing a small amount of effective wear of the alarm carbon brush to achieve early activation of the alarm and prevent false alarms.
3. To make the carbon brush a reliable part of the current collector, it is necessary to use good materials and a reasonable structure.
4. Generally, cranes use two current collectors. The automatic alarm current collector has two alarm forms: light and sound. After the alarm, the machine can still work normally, but it reminds users to prepare spare parts and replace them in a timely manner during breaks.
Conclusion
Industrial products have a certain life cycle. When their drawbacks become prominent, a new and more reasonable product must replace and improve them. The automatic alarm current collector is technically more reasonable and is an upgraded product of traditional current collectors. It is hoped that its introduction will promote the application of sliding contact wires. The national patent number for the automatic alarm current collector is ZL 03222145.2 4 (This article was published in "China Equipment Engineering" - Special Topic on Crane Selection - New Technology, New Process, New Device column, and has been included in the large-scale literature "China Modernization Construction Research Library". It also won the first prize for excellent papers in the "China Modernization Construction Theory and Practice" excellent paper selection.)
Application of Automatic Alarm Current Collector for Safety Sliding Contact Wire
Abstract: This paper mainly analyzes the safety sliding contact wire current collector, enabling users to recognize the characteristics of the automatic alarm current collector and the importance of its application, so as to promote its widespread use in mobile conductive technology. Keywords: unpredictable; end of wear; seemingly touching but not touching; automatic alarm.
Chinese Library Classification Number: TM645 Document Code: B
The replacement of old-style angle iron mobile conductive devices with safety sliding contact wires has now been widely accepted by users.Sliding contact wire refers to the sliding contact wire body and the matching current collector assembly. Usually, users' understanding of sliding contact wire quality is often limited to the body itself, and they consider the current collector to be a consumable item that can be replaced with a new one when worn out. This understanding conceals the fact that after the carbon brush wear life ends, there are great hidden dangers. This paper mainly analyzes the current collector, re-recognizes its importance, and proposes solutions. 1. Unpredictability of wear: Safety sliding contact wires mostly use the current collector carbon brush in tight contact with the conductive surface, achieving continuous power supply through friction sliding. The speed of carbon brush wear, the amount of wear, and the moment of end of wear are related to factors such as the frequency of use, working system, working environment, roughness of the conductive surface, and pressure, which cannot be monitored by humans. This unpredictable power outage after the end of carbon brush wear has always been a difficult problem to solve in the use of current collectors. 2. Hidden dangers at the end of wear: The sliding contact wire current collector supplies power normally within the effective wear range of the carbon brush. But after the carbon brush wear ends, from a static perspective, the spring tension is insufficient, pressure is almost nonexistent, resistance increases, and contact is poor. From a dynamic perspective, wear is gradual, and the work is in a moving state, even inching, so the starting current is large. Coupled with vibration during movement, installation defects of the sliding contact wire, deformation, and other factors, the carbon brush and conductive surface are seemingly touching but not touching, thus producing strong sparks, burning the current collector black, deforming the carbon brush frame, increasing the friction coefficient of the sliding contact wire conductive surface, and affecting conductive performance. If the service life of the first current collector is one year, then due to the roughness of the conductive surface and the high-current working environment of cranes, the service life of subsequent current collectors will become shorter and shorter. The practical use of sliding contact wires proves that if the design of the current collector only considers the collection function without considering the hidden dangers at the end of carbon brush wear, the consequences will be serious.
Automatic Alarm Current Collector
1. While maintaining the original technical features, design a contact conduction mechanism in the current collector for when the carbon brush is worn out, introducing current to the alarm device.
2. The spring tension of the alarm carbon brush is slightly increased compared to other carbon brushes, sacrificing a small amount of effective wear of the alarm carbon brush to achieve early activation of the alarm and prevent false alarms.
3. To make the carbon brush a reliable part of the current collector, it is necessary to use good materials and a reasonable structure.
4. Generally, cranes use two current collectors. The automatic alarm current collector has two alarm forms: light and sound. After the alarm, the machine can still work normally, but it reminds users to prepare spare parts and replace them in a timely manner during breaks.
