Single hall proximity sensor ship stern shaft speed measuring device

Abstract

The invention discloses a ship tail shaft speed measurement device with a single Hall proximity type sensor. The ship tail shaft speed measurement device comprises a permanent magnet hoop (1), the Hall proximity type sensor (2), and an input conditioning circuit (3), a single chip microcomputer (4), an analog value output module (5), a digital display module (6) and an RS232 communication module (7) which are connected with one another through electric signals, wherein the permanent magnet hoop (1) is arranged on a ship tail shaft; the Hall proximity type sensor (2) senses a pulse square wave according to the change of a relative position between upper magnetic steel of the permanent magnet hoop (1) and the sensor; a pulse square wave signal is input into the single chip microcomputer (4) after being conditioned through the conditioning circuit (3); a capturing unit of the single chip microcomputer outputs a rotating speed and a steering signal according to the captured pulse square wave. The ship tail shaft speed measurement device with the single Hall proximity type sensor has a low requirement on the mounting precision and can avoid the influence of displacement, which is caused by vibration, impact and deformation of a shaft system of a ship body, on the signal acquired by the sensor, so that the precision for measuring the speed of the ship tail shaft can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of ship turbine automation, in particular to a ship stern shaft speed measuring device with a single Hall proximity sensor. Background technique [0002] The rotational speed of the ship's stern shaft is one of the basis for the driver to determine the ship's maneuvering decision. The traditional ship stern shaft speed measurement scheme can be divided into two categories: tachogenerator and magnetic induction non-contact measurement. The working principle of the tachogenerator is to convert the rotational speed into a voltage signal. It operates reliably but has a large volume and low precision; the working principle of the magnetic induction non-contact measurement is to install a gear on the stern shaft. When the stern shaft rotates, the sensor induces a periodic signal. Pulse square wave. At present, the latter is widely used in practice, but it needs to use two magnetic sensors to stagger and install ...

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