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1. 发明公开

EP4421538A1 METAL DETECTION APPARATUS WITH A TEST DEVICE AND TEST DEVICE 审中-公开
公开(公告)号：EP4421538A1
公开(公告)日：2024-08-28
申请号：EP23158451.7
申请日：2023-02-24
申请人： Mettler-Toledo Safeline Limited
发明人： Banks, Tom
IPC分类号： G01V3/10 , G01V13/00
CPC分类号： G01V3/107 , G01V13/00
摘要： The metal detection apparatus (1) comprises a detector housing (14) with an input aperture (11) and an output aperture (12) delimiting a transfer channel (10) along which products (P) are movable through a coil system (6) that defines a detection zone (60) and that comprises a transmitter coil (61) and a first and a second receiver coil (62, 63) dimensioned such that a current applied to the transmitter coil (61) induces a first receiver coil signal in the first receiver coil (62) and a second receiver coil signal in the second receiver coil (63), that do not compensate one another when a metal contaminant (C) is present in the detection zone (60), further comprising a test device (2) that comprises at least one test sample (S1, S2, ···) that is movable through the detection zone (60), a signal processing unit (4) for processing the receiver coil signals and for detecting signals relating to contaminants (C) and for detecting signals relating to the at least one test sample (S1, S2, ···), and comprising a control unit (5) for controlling measurement of products during normal operation and for controlling measurement of the at least one test sample (S1, S2, ···) during test intervals. According to the invention the test device (2) comprises a first reel unit (21) arranged at the input aperture (11) comprising a first reel drive unit (271), that is rotatably holding a first reel (291), a second reel unit (22) arranged at the output aperture (12) comprising a second reel drive unit (272), that is rotatably holding a second reel (292), and an elongated windable sample carrier (28) that is extending through the detection zone (60) and that has a first end, which is windably held by the first reel (291), that has a second end, which is windably held by the second reel (292), and that holds the at least one test sample (S1, S2, ···), and wherein either the first reel drive unit (271) or the second reel drive unit (272) is controllable by the control unit (5) to transfer the at least one test sample (S1, S2, ···) during test intervals through the detection zone (60), or the first reel drive unit (271) and the second reel drive unit (272) are controllable by the control unit (5) to transfer the at least one test sample (S1, S2, ···) during test intervals through the detection zone (60).

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