| 主权项 |
1. An electronic bolt seal for locking a comprising seal body and a bolt assembly plugged into the seal body through a latch hole of a latch so as to lock the latch, wherein
the bolt assembly comprises an electrically conductive casing and a circuit board; the bolt assembly comprises a bolt body, a bolt head at a top end of the bolt body, a channel running axially downward through the bolt head and the bolt body, and a first fastening element around a circumference of a bottom portion of the bolt body; the channel comprises a chamber section in a top segment of the channel; the chamber section has a diameter not less than that of the latch hole; a top cover seals a top end of the channel; a top portion of the casing is wrapped inside a plastic waterproof cover; the circuit board is housed in the channel; the circuit board comprises a control circuit on a front surface; the control circuit comprises a wire layout having a bottom contact, a top contact, and an RFID chip; when the bolt assembly is plugged into the seal body and cannot escape due to the first fastening element's engaging the seal body, the bottom contact electrically connects the RFID chip to an internal antenna of the seal body; the top contact is moved upward to contact the top cover so that the casing functions as an external antenna to the RFID chip; and, when the bolt head is ground to a diameter smaller than that of the latch hole, the electrical connection between the top contact and the top cover is broken. |
