发明名称 |
Fault detecting device for welded pipe joints. |
摘要 |
<p>In an electro-fusion welding process a fault, e.g. due to incorrect assembly of the pipe joint components, is detected by sensing the welding current and emitting a signal to actuate an audible or visible alarm and/or to interrupt the welding process, if the welding current increases unexpectedly. A reference signal dependent upon the current dependent signal produced by the sensor (1) and RMS to DC converter (2) at a time t, is held by a converter (5) and is compared by a comparator (7) with the current dependent signal transmitted through converter (6) at subsequent intervals. So that the device does not react to transient current increase a delay arrangement (9-12) delays the output signal for a given time.</p> |
申请公布号 |
EP0216576(A2) |
申请公布日期 |
1987.04.01 |
申请号 |
EP19860307010 |
申请日期 |
1986.09.11 |
申请人 |
FUSION PLASTICS LIMITED;VECTSTAR LIMITED |
发明人 |
BRIDGSTOCK, ERIC;GLAVES, BRIAN;KENWORTHY, DAVID MICHAEL ANTHONY;BILTON, DAVID ALAN |
分类号 |
B29C65/18;B29C65/00;B29C65/30;B29C65/34;H02H3/093 |
主分类号 |
B29C65/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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