Air-suction mode fault diagnostic device and method for gear oil pump

Abstract

The invention relates to an air-suction mode fault diagnostic device and a method for a gear oil pump. The gear oil pump is connected with a power unit by a power takeoff shaft, wherein the air-suction mode fault diagnostic device comprises an oil suction negative-pressure sensor which is arranged on a main pump oil inlet, a plurality of noise sensors which are respectively arranged around the power unit, the power takeoff shaft and the gear oil pump, an oil outlet parameter sensor which is arranged on a main pump oil outlet, a signal collector which is respectively connected with the sensor, an air-suction mode parameter database for recording pre-measured air-suction mode parameters, and an electric control unit which is respectively connected with the signal collector and the air-suction mode parameter database; and the electric control unit comprises a comparison module for reading the air-suction mode parameters from the air-suction mode parameter database, and comparing the parameters with the signals collected by the signal collector, and an alarm / feedback module for performing alarm and / or feeding back fault signals to the power unit according to the determined air-suction mode faults. When the air-suction mode fault diagnostic device and the method are used, the air-suction mode faults of the gear oil pump can be precisely diagnosed.

Description

technical field [0001] The invention relates to fault diagnosis technology, in particular to a device and method for fault diagnosis of a gear oil pump in the suction mode. Background technique [0002] For the driving form of the hydraulic pump of the construction crane, the hydraulic pump of the construction crane (such as a single gear oil pump or a multiple gear oil pump) is driven by other power units (such as a motor), and the quadruple gear oil pump is connected to the power by the fixing device. shaft connection. When the oil pump operation is required, the power take-off shaft is hung on the quadruple gear oil pump, and the power take-off shaft drives the quadruple gear oil pump to work, and the working conditions of the quadruple gear oil pump are controlled by the combination and disconnection of the clutch. The power unit has an external casing, and the power unit also has a heat dissipation mechanism arranged at an end away from the power take-off shaft. [00...

AI Technical Summary

Problems solved by technology

[0003] During the use of the gear pump, due to the influence of factors such as the poor sealing performance of the low-pressure pipeline and the deep part of the pump shaft, the clogging of the oil inlet filter, and the viscosity of the oil, the vacuum degree of the oil inlet of the gear pump is relatively high, which makes the air Infiltration, resulting in "air suction" mode, when the gear pump is running at high speed, the bubbles are instantly squeezed and broken to form sharp and harsh noises, which affect the normal operation of the gear pump

At present, we can only try to detect the occurrence of the cavitation mode by testing the suction negative pressure at the pump inlet, but this test method cannot accurately diagnose the failure of the cavitation mode

Images