Marine diesel engine sliding bearing wear monitoring device based on contact potential method

A marine diesel engine, contact potential technology, applied in the direction of mechanical bearing testing, etc., can solve problems such as large alignment, signal interference, etc., to achieve the effect of improving alignment, ensuring safe operation, and creating social benefits

Pending Publication Date: 2022-02-01
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a marine diesel engine sliding bearing wear monitori

Method used

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  • Marine diesel engine sliding bearing wear monitoring device based on contact potential method
  • Marine diesel engine sliding bearing wear monitoring device based on contact potential method
  • Marine diesel engine sliding bearing wear monitoring device based on contact potential method

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Embodiment Construction

[0031] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0032] In the normal operation of diesel engine shaft sliding bearings, there is a lubricating oil film between the crankshaft and the bearing bush, which avoids direct contact between the two metals. Usually the oil film thickness of the sliding bearing of a diesel engine is in the range of 0.1-1mm, and because the conductivity of the lubricating oil is low, it can be regarded as an insulator, but there will be micro-convex peaks on the surface of the bearing bush and the crankshaft, and micro-convex peak contact will occur when the working condition is bad , when the micro-convex peaks are in contact, the crankshaft and the bearing bush are considered to be connected, and they are equipotential bodies. Based on this, ...

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Abstract

The invention relates to a marine diesel engine sliding bearing wear monitoring device based on a contact potential method, which comprises a mechanical supporting device, a signal leading-out device and a signal analyzing and processing unit, wherein the mechanical supporting device comprises a machine body connecting piece, a crankshaft connector and a coupler; the signal leading-out device comprises a sleeve, a main shaft, a carbon brush and an encoder; the signal analyzing and processing unit comprises a contact potential leading-out closed loop and a crankshaft corner signal processing circuit; the machine body connecting piece is mounted on a diesel engine body; the sleeve is coaxially connected with the machine body connecting piece; one end of the crankshaft connector is positioned in the machine body connecting piece and is connected with the main shaft; the carbon brush is installed on the main shaft and connected into the contact potential leading-out closed loop to lead out the potential of the crankshaft and the main shaft; and the encoder is installed on the main shaft, serves as a corner mark signal output device and is connected into the crankshaft corner signal processing circuit. Compared with a thermoelectric effect method, the device improves the signal-to-noise ratio, and facilitates the extraction of bearing wear fault features under a strong noise background.

Description

technical field [0001] The invention belongs to the technical field of diesel engine equipment, and in particular relates to a wear monitoring device for a shafting sliding bearing of a marine diesel engine. Background technique [0002] Bearings account for about 25% of the total friction loss in internal combustion engines, especially in some high-strength internal combustion engines, this proportion can reach 40%. And when the friction pair is severely worn, a series of serious accidents will occur, which will affect the economy, power and reliability of the internal combustion engine. [0003] The sliding bearing of the diesel engine is the position support and calibration part of the crankshaft. The crankshaft is subjected to complex forces during the motion process. Under the alternating load that changes periodically in the working cycle of the diesel engine, the sliding bearing is prone to heat and wear. The uneven and excessive wear of the sliding bearing will incr...

Claims

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Application Information

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IPC IPC(8): G01M13/04
CPCG01M13/04
Inventor 杨建国万标覃培刚
Owner WUHAN UNIV OF TECH
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