Testing process for the quality control of electromagnetically actuated switching devices
First Claim
1. A testing process for the quality control of electromagnetically actuated switching devices in which current contacts are made by actuating an armature, the process including steps of:
- a) actuating the armature of a switching device to close the switching device;
b) detecting sound emitted by the switching device when its armature is actuated;
c) transmitting the sound detected in step (b) to an evaluation device;
d) discriminating sound signals caused by a making of the contact from sound signals caused by the armature striking a magnetic core by analyzing at least one of a time curve of individual components of the sound and a frequency curve of the individual components of the sound;
e) evaluating only the sound signals caused by the armature striking the magnetic core.
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Accused Products
Abstract
Switching devices in which current contacts are made by actuating a magnetic armature, are tested by analyzing the vibrations or sound emission occurring under operating conditions. According to the present invention, the sound emitted by the switching device when it is actuated is detected by a sensor and is transmitted to an evaluation device for discriminating the time and/or frequency curve of individual sound components. With the process of the present invention, discriminating between the sound signals produced by the making of the contacts on the one hand, and the striking of the armature on the other hand, is possible. In addition, a sound analysis in a suitable time range permits any faults present in the switching device to be classified. Finally, especially in the application to flashing signal relays, whether the sound of the relay is proper, can be objectively determined. In all cases, particularly the high frequency sound components are evaluated.
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Citations
24 Claims
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1. A testing process for the quality control of electromagnetically actuated switching devices in which current contacts are made by actuating an armature, the process including steps of:
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a) actuating the armature of a switching device to close the switching device; b) detecting sound emitted by the switching device when its armature is actuated; c) transmitting the sound detected in step (b) to an evaluation device; d) discriminating sound signals caused by a making of the contact from sound signals caused by the armature striking a magnetic core by analyzing at least one of a time curve of individual components of the sound and a frequency curve of the individual components of the sound; e) evaluating only the sound signals caused by the armature striking the magnetic core. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A testing process for quality control of an electromagnetically actuated switched device in which current contacts are made when an armature is actuated and in which, when properly functioning, the armature comes to rest during a time range, the process comprising steps of:
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a) actuating the armature to close the switching device; b) detecting a sound emitted by the switching device when the armature is actuated; c) transmitting the sound detected in step (b) to an evaluation device; d) discriminating individual components of the sound detected in step (b) based on at least one of a time curve of the individual components of the sound and frequency curve of the individual components of the sound; e) analyzing the sound transmitted in step (c) in the time range; and f) classifying the analyzed sound detected within the time range as at least one of a plurality of faults. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A testing process for the quality control of electromagnetically actuated switching devices in which current contacts are made by actuating an armature, the process comprising steps of:
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a) actuating the armature to close the switching device; b) detecting sound emitted by the switching device when the armature is actuated; c) transmitting the sound detected in step (b) to an evaluation device; d) discriminating individual components of the sound based on at least one of a time curve of the individual components of the sound and frequency curve of the individual components of the sound; e) separating sound signals which are generated when the contact is made and generated when the armature strikes a magnetic core from sound signals caused by a post-switching oscillation of components; and f) objectively determining whether the switching device has a proper sound based on the separated sound signals. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification