| 摘要 |
<p>A level sensor, particularly an electromagnetic pushing and knocking type object detector, comprising: a magnetic swinging rod (5), an electromagnet (3) disposed at one side of the magnetic swinging rod (5), and an electronic module (2), for controlling the electromagnet (3) to drive the magnetic swinging rod (5) to swing and performing amplification, processing and time delay output on swinging signals of the magnetic swinging rod (5) collected by the electromagnet (3). The magnetic swinging rod (5) is suspended at one side of a body casing (4) by a suspending device. The electromagnet (3) is disposed in the body casing (4). The electromagnet (3) consists of an electromagnet iron core (31) and an electromagnet coil (32). The electric module (2) comprises a power supply circuit (21), a pulse generation circuit (22), a pulse driving circuit (23), a signal amplification circuit (24), a signal processing circuit (25), and a signal time delay output circuit (26), and the circuits are all disposed in the body casing (4) or are isolated from the body casing (4) and separately packaged. The present invention has the advantages that the sensitivity is high, the accuracy and the reliability are high, the application scope is wide, the maintenance is avoided, the service life is long, and the like.</p> |
