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Roller type wheel washer detection and diagnosis method

From： Hunan ZEGA Date：2019-07-19 16:43:30 Hits：622 Belong to：Company News

style="font-size:13.5pt"> roller style vibration, temperature rise, noise and other phenomena generated during the operation of the wheel washer, carrying a large number of signals about the technical status of mechanical parts, detection and diagnosis is the use of these external signals to determine its internal advantages and disadvantages.

> Diagnostic technical operation detection means must meet at least the following requirements。

　　1. Sensitivity. The sensitivity should be high, the change of detection parameters is often very detailed, and only high-sensitivity test methods can meet the requirements of diagnostic technology.

　　2. Single-valued property. The measurement data must have a clear correspondence to determine the nature, location and degree of specific faults from the diagnostic results.

　　3. Practicability. It should be economical, practical, fast, convenient and easy to operate.

　　4. Stability. The stability should be good, such as the same state of the machinery sometimes to be tested multiple times, the result dispersion should be small, the repeatability should be good, and it should be stable.

　　5. Security. When the roller wheel washer is diagnosed in operation, the instrument must be safe and effective within the limited diagnostic range and can withstand the diagnostic conditions and environment as well as possible misoperation.

　　The methods of roller wheel washer testing include: sensory detection, vibration measurement, temperature measurement, lubricating oil sample analysis, noise measurement, non-destructive testing testing, etc., which we understand separately.

style="font-size:13.5pt"> Sensory detection: mainly using the sense of touch, sight, hearing and smell for detection.

　　Haptics is the use of hands to touch machinery, detecting gaps, temperatures, and vibrations. (Judge whether the matching properties of shaft and hole mating parts change in natural wear, judge the temperature of the dynamic mating friction surface, and judge the vibration of machinery); Vision is to check the appearance of the machinery and the lubrication and cleaning status (check whether the parts are complete, whether the device is correct, whether there are loose, cracks, damage, etc.); Check whether the lubrication is normal, whether there is dry grinding and oil leakage, and see the oil quantity and oil quality of the lubricating oil; monitoring of the indication data of conventional instruments installed on the machinery); Hearing is listening to the ringing and noise of machinery (measuring gear meshing with a hearing stick; Tap the parts with a hand hammer to listen to the sound of the parts); The sense of smell is the smell emitted by machinery (some machinery malfunctions produce abnormal odors, such as burnt smell; Some stationary equipment, leaking chemical liquids or gases emit a special odor).

　　Sensory monitoring and diagnosis is a subjective monitoring method, requiring the monitor to have rich experience to be competent, due to the different technical experience of each person, in order to reduce the deviation, can be solved by multiple "consultations".

　　Vibration measurement: machinery in operation to produce a certain program of vibration, under normal circumstances, the two main parameters of vibration - amplitude and acceleration should be basically stable within the allowable range. Because the vibration signal is relatively sensitive, its forecasting performance is more timely and accurate than other signals such as temperature. Therefore, vibration measurement has become the main means of monitoring and fault diagnosis of machinery.

style="font-size:13.5pt"> Classification of vibration measurement methods: from the measurement principle, it can be divided into mechanical methods, photometry and electrical measurement. At present, the most widely used is the electrical measurement method.

　　Temperature measurement: the change of the temperature of the friction part of the machinery is often a harbinger of mechanical failure, and the use of thermometer to measure the data of temperature change to judge the technical state of the machinery to detect early faults is a commonly used diagnostic technique.

> There are many types of thermometersAccording to the measurement method, there are contact type and non-contact type.

　　The temperature measuring element of the contact thermometer has good thermal contact with the measured object, which can measure the temperature distribution inside the object, but the measurement error is large for the moving body, small target or small heat capacity measurement object. Commonly used are liquid glass thermometer, resistance thermometer, thermocouple thermometer.

　　Non-contact thermometers estimate the surface temperature from the radiant energy of an object. This kind of thermometer will not destroy the temperature field of the measured object, do not have to reach thermal balance with the measured object, the upper limit of temperature measurement is not limited, the dynamic characteristics are better, the surface temperature of the moving body, small target and small heat capacity or rapid temperature change is measured, the use range is wider, but it is susceptible to environmental influences, limiting the accuracy of temperature measurement, commonly used are the following: optical pyrometer, radiation pyrometer, infrared thermometer, thermal radiation temperature imager

　　Lubricating oil sample analysis: The use of particulate matter in lubricating oil to diagnose the degree of wear of machinery is a fast, accurate and widely used diagnostic technology. Lubricating oil sample analysis can be divided into two categories according to different indicators and methods: one is the analysis of physical and chemical performance indicators of the oil itself; The other type is the analysis of particulate matter in oil, also known as grinding chip analysis.

　　Noise measurement: During the operation of machinery, increased noise means wear and tear of machinery or the appearance of other faults. Noise measurement and analysis help diagnose mechanical faults.

> The characteristics of mechanical noise depend mainly on the sound pressure level and noise spectrum。 The corresponding measuring instruments are sound level meters and frequency analyzers.

　　Non-destructive testing measurement and testing: referred to as non-destructive testing, it is a variety of testing technologies that uate its nature, state and internal structure without damaging and destroying the mechanical structure.

　　Roller wheel washer and its parts in the manufacturing process, may produce a variety of defects, such as cracks, looseness, bubbles, slag inclusion, not welded through, etc., non-destructive testing not only to detect the existence of defects, but also to make quantitative and qualitative assessment, mainly the following methods:

> 1) Endoscopic visual method, visual inspection of the inside of the machinery using an endoscope;

style="font-size:13.5pt"> 2) Penetration detection method, apply the penetrant to the surface of the test piece;

style="font-size:13.5pt"> 3) Magnetic particle flaw detection method, a method of judging the location and size of the defect with magnetic particle traces;

　　4) Electromagnetic induction eddy current flaw detection method, using high-frequency alternating voltage to induce eddy current changes in the conductor part of the measured object by detecting the coil;

style="font-size:13.5pt"> 5) Radiographic flaw detection, a method of using rays to have the ability to penetrate matter;

style="font-size:13.5pt"> 6) Ultrasonic flaw detection, a method of using the principle that the emitted ultrasonic waves are reflected or attenuated at the defect of the inspected object;

style="font-size:13.5pt"> 7) Acoustic emission detection method, using the principle of sound waves generated by the expansion of the sensor mounted in the mechanical defect part;

　　8) Strain detection method, the principle of sensing the magnitude, stress state and maximum stress part, direction and size of the mechanical external force to judge the size and shape of each component and whether the materials used are reasonable.

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