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Method for detecting and diagnosing faults of intermittent low-speed and heavy-load device

A low-speed heavy-load, equipment failure technology, applied in flow characteristics, measuring devices, instruments, etc., can solve the problems of intermittent low-speed heavy-load equipment failure diagnosis, noise signal interference of fault feature information, and difficulty in extracting weak vibration signals.

Inactive Publication Date: 2012-01-04
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the traditional vibration signal analysis method cannot effectively diagnose the fault of intermittent low-speed heavy-duty equipment, overcome the difficulty of extracting weak vibration signals in the existing vibration signal analysis method, and make meaningful fault feature information easy Disadvantages of being interfered by noise signals, a method of monitoring, analyzing and diagnosing early faults of intermittent low-speed heavy-duty equipment using oil (grease) detection and analysis technology is proposed

Method used

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  • Method for detecting and diagnosing faults of intermittent low-speed and heavy-load device
  • Method for detecting and diagnosing faults of intermittent low-speed and heavy-load device
  • Method for detecting and diagnosing faults of intermittent low-speed and heavy-load device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A large container ship of a shipping company sailing regularly between Shanghai and Japanese ports, when the cargo was loaded and ready to sail, the chief engineer found a large number of large-sized metal abrasive particles on the oil filter, in order to ensure that the ship The safety of the voyage, the captain ordered to stop sailing.

[0026] If the flight fails to depart smoothly, the shipping company may face huge economic losses from three aspects: first, the cargo cannot reach the destination on time, and the carrier will pay huge compensation for breach of contract; second, the ship needs to be sent for inspection immediately to find out the problem Therefore, in addition to paying a lot of maintenance costs, the shipping company will also bear a huge loss of suspension of voyages; Pay an additional charter fee. The above three losses combined are estimated to be as high as several million yuan.

[0027] Because the matter is of great importance, in order to ...

Embodiment 2

[0043] A serious accident of crankshaft locking and piston scuffing happened to an imported diesel engine within ten hours after the overhaul. After contacting the repair unit, it is confirmed that there is no problem with the parts and assembly of the engine. It is further suspected that there may be a problem with the lubrication of the engine: either the wrong oil is used, or the lubricating oil channel is not cleaned when the engine is assembled. However, the repair unit confirmed that neither of the above two situations existed. So the doubts were focused on whether there were impurities entering the lubricating oil passage when the engine was running, but after checking the air filter, it was confirmed that it was working normally, so the doubts were concentrated on the fact that the parts were not cleaned when the engine was assembled. After disassembly and inspection, it was found that the lubricating oil passage of the engine was blocked, and there was black uneven s...

Embodiment 3

[0056] An enterprise newly purchased three air compressors, which were installed and put into use less than 40 hours after they were installed and adjusted, and the failures and shutdowns caused by the stuck pistons occurred one after another. In order to analyze and judge the cause of the failure, the user took 250mL samples from each of the three units and sent them to the oil analysis laboratory. The physical and chemical indicators such as the appearance, viscosity, moisture, acid value and spectral elements of the samples were tested and analyzed. The results are as follows:

[0057] Table 3.1. Summary table of oil product analysis results

[0058] project

new oil

1# unit sample

2# unit sample

3# unit sample

Exterior

Colorless and transparent

dark brown smell

dark brown smell

dark brown smell

Kinematic viscosity at 40°C mm2 / s

98.96

111.6

96.14

131.6

Moisture %

none

0.18

...

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Abstract

The invention discloses a method for state monitoring and fault diagnosis of an intermittent large-scale low-speed and heavy-load production device, wherein the state monitoring and the fault diagnosis can not be effectively solved by utilizing the vibration signal analysis method, and the method is the technical method for carrying out the state monitoring and the fault analysis and diagnosis onthe intermittent large-scale low-speed and heavy-load device through physical and chemical index detection, spectral analysis and ferrographic analysis of lubricating oil liquid (grease) used by the device. The invention provides an early wear fault diagnosis and maintenance scheme of the low-speed and heavy-load device, which can improve the accuracy of lubrication state monitoring of the low-speed and heavy-load device and the using management level of the lubricating oil (grease), save maintenance cost, prolong the service life of the device and create greater production value.

Description

technical field [0001] The purpose of the present invention is to carry out the problem of condition monitoring and fault diagnosis to intermittent large-scale low-speed heavy-duty production equipment, more specifically proposes a kind of through the physicochemical index detection and spectrum, iron Spectrum analysis, a technical method for condition monitoring and fault analysis and diagnosis of intermittent large-scale low-speed and heavy-load equipment, belongs to the technical field of intermittent low-speed and heavy-load equipment condition monitoring and fault diagnosis. technical background [0002] In modern large-scale process production enterprises, most of the production equipment is heavy-duty equipment with low speed, large load, and high impact load during intermittent motion. Most of this kind of equipment is in the harsh working environment of high temperature, dust, and strong noise. It has a complex structure and a high level of automation. Once an acci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N11/00G01N21/62G01N15/00
Inventor 高立新李国超李勇才翟奋楼张珥张慧钱国义蒋卓惟叶辉汪建民
Owner BEIJING UNIV OF TECH
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