Introduction: Signs of failure, also known as symptoms of failure, are the various phenomena that occur when machine of pad without wings fails. For example, powertrain symptoms are a drop in power, increased fuel consumption, smoke from the exhaust, difficulty starting, oil leaks, water leaks or even failure to start.
In this article, we will explain that these variable signs are divided into six main categories.
The symptoms of conventional system include abnormal vibration, noise increase, suspension, clutch unclear, pulley can not maintain the predetermined movement pattern, efficiency decline, transmission stability gradually damaged, the symptoms of hydraulic system generally can not achieve the predetermined pressure or pressure distribution, efficiency decline, abnormal vibration and noise, heat, oil leakage, etc.. ; symptoms of the travel steering system are often impact sound, deviation, steering failure, etc.
Such as excavator, loader production decline, lathe, planer machining accuracy is reduced, the relationship between diesel engine fuel consumption and output changes. These signs are very obvious and easy to find. However, the causes of their formation are relatively complex and must be carefully analyzed in the diagnosis to correctly determine the location of the problem and its causes.
Vibration of machinery is a property during operation, and even the most precise devices inevitably generate vibration during operation. However, when in a normal state, the vibration parameter values are within the permissible range. If the vibration is abnormal, it is inevitably caused by a fault.
If the rotor is unbalanced this will lead to increased radial vibration, if the axes do not overlap this will lead to increased axial vibration, if the lubricating oil gradually decreases this will lead to violent, erratic vibration, etc. Such signs reflect changes in operating conditions and are important information for diagnosis. Therefore, abnormalities of machine of pad without wings can be diagnosed by studying and analyzing the characteristics of vibration and its changes.
When in a normal technical state, only some uniform and slight sounds can be heard during operation. If machine of pad without wings is accompanied by other messy and heavy sounds during operation, such as continuous or intermittent heavy then metal knocking sound, short and clear "rattling" sound, it means that the machine is no longer in normal technical condition.
Abnormal sound not only covers a wide range, but experience shows that all heavy sound and vibration is a serious precursor to a possible traumatic component accident. Therefore, abnormal sounds are strong evidence of poor technical condition. Be sure to take the signs of abnormal noise seriously, check them carefully, and judge them correctly.
Overheating usually occurs in the engine, transmission, brakes, bearings and other parts. Under normal working conditions, these parts should maintain a certain working temperature, no matter how long they work. If the temperature of these parts exceeds the specified operating temperature, known as overheating, it indicates that there is a potential failure of a part.
If the engine overheats, it indicates an abnormality in the cooling system, and the transmission or bearing overheating phenomenon is mainly caused by the lack of lubricant. If the problem of some overheating phenomenon is not diagnosed and eliminated in time, it will lead to parts burning damage or melting accident. Therefore, signs of overheating should not be ignored.
Bearings, gears, pistons, cylinder barrels and other parts, wear residues can be collected in the lubricating oil or hydraulic oil during machine operation. The amount of wear particles in the oil sample is a function of the damage to the part. Determining the content of wear particles in the oil sample allows you to determine the degree of wear of the part. Therefore, by collecting wear residues and analyzing oil samples, information on wear can be obtained, which is an important way of diagnosis.
Surface or internal defects and damage of parts are the hidden danger of machine damage. The so-called surface or internal defects of the parts, refers to machine of pad without wings processing process of metal parts or materials (including welding, forging, casting, rolling, etc.) caused by slag, loose, porous, trachoma, cracks, etc.. Among them, crack defects have the most serious impact on the curvature of the part.
In recent years, the aging of machine of pad without wings has been raised as an important issue. During the aging process, cracks are produced in the form of wear, fracture, corrosion and other damage to the part. It can be seen that most abnormal parts are closely related to the various forms of cracks present in the parts. Cracks in a part do not necessarily lead to abnormalities. Cracks may not significantly reduce workability until a certain size is reached.
Therefore, the question is not whether cracks are present, but whether they will expand rapidly and cause a reduction in the workability of the machine of pad without wings. Whether the cracks are formed during machining of the part or during use, they will inevitably expand when the part is subjected to long-term effects of variable stresses. During crack expansion, the shelter is released in the form of a sheltering force wave. When the energy released is large enough, it emits a sound, which is a sign of crack expansion. Using advanced acoustic emission technology, it is possible to diagnose crack-induced failures based on the signs of crack expansion.
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