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Anatomy of the sliding (smooth) bearing of the initiator (1)
Source: China Bearing Network Time: 2014-05-14
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There are many types of sliding bearings on an initiator; both the bushings and the bearing bushes are attributed to the sliding bearings. In order to ensure the accuracy of the starting machine, the working clearance requirements of these sliding bearings are also high. The cause of the sliding bearings of the initiating machine is the cause of the problem. Can be attributed to: smooth critical state and any disturbances that cause damage to the working space and any material that damages the oil film. For example, device adjustment is not accurate, parts are bumpy and poorly hygienic, improper application methods, harmful chemical reactions, etc.; Incurs the damage of the sliding bearing. According to the analysis of the Cummins in the United States, the main reason for the damage of the sliding bearing is four aspects. The percentage of these four aspects is as follows:
1. The damage caused by hygiene is 45%.
2, due to the damage caused by the smooth side is 25%,
3, due to the application and equipment damage is 15%,
4. The damage caused by external reaction and other aspects is 15%.
From this accounting ratio, we can see that the damage caused by the degree of hygiene is the main reason. Avoiding the damage caused by the poor hygiene is multi-faceted: ensuring the sanitation of the parts is only one aspect when assembling the machine; On the other hand, the initiator is in the process of operation. Operators and repairers must correctly use the timely protection view according to the rules; especially the initiators who work in the dusty and chemical raw materials environment for a long time; must adopt the method Avoid dust and chemical gas corrosion; ensure the life of the launcher. The outer bearing alloy layer of the spindle and the connecting rod in the initiator is the softest; the load is the largest; the simplest damage; so the following is the main bearing and connecting rod The appearance of the tile is damaged; the cause of the analysis; to avoid repeated problems after the correction.
First, the problems caused by the hygiene problem:
1. Wear of small particle foreign matter on bearing pad formation:
When the oil filter element is in the oil drain plug of the engine oil bottom; the first few oils flowing out of the oil; the naked eye can be directly seen and more alloy powder; the bearing bush is now worn. This is due to the small size The impurities of the particles enter the movement of the bearing layer of the bearing shell; although the bearing bush does not form severe damage; however, such an image continues to develop; not only the early damage of the bearing bush; the shaft is also severely damaged; therefore, it is necessary to rely on the disease The reason for the timely removal; avoid the damage of the formed parts. The service life of the starter bush after the fault is removed cannot be calculated according to the normal wear time; because the abnormal wear of a small particle is equivalent to the normal wear of the machine for 2500 hours. .
The reason for the entry of fine particles is as follows: First, the filter function of the air filter is poor or the sealing of the air intake system is not good; the pipelines and joints of the intake system should be checked; whether there is a break or looseness; whether the filter element is loose or not, Whether the paper core has a break or not. Whether it is repairing or protecting the entire air intake system is very important; it is necessary to ensure reliability. Second, after the smooth oil is contaminated, participate in the initiator or the oil and the filter element is used for a long time. Blocked; so that the oil of each smooth appearance will enter directly without filtering. Therefore, pay attention to the hygiene of the oil when adding smooth oil; equip the necessary filtering machine; replace the smooth oil and filter element in time according to the application rules. If the fuel supply is too large, the incineration is not complete, and the nozzle leaks; the fuel is formed into the crankcase; together with some impurities, the fuel enters the crankcase and the oil mixes together to reduce the smoothing effect. Therefore, the launching machine should pay attention to investigating the initiator. Exhaust smoke and operating conditions; if there is an abnormality, it is necessary to promptly check the reasons for correction or replacement. Fourth, when the engine is assembled; the internal parts are poorly sanitized. When starting the machine; must pay attention to the hygiene of the parts; the device should pay attention to avoid re-contamination; ensure the internal hygiene of the device.
No matter what kind of reason; it is necessary to replace the engine oil and the filter element after the removal of the fault. The repaired starter initiates an empty operation for two hours to stop the operation for inspection; there is no alloy powder in the oil; However, it is necessary to pay attention to the investigation at the beginning of the application; after 60 to 120 hours of operation, it is confirmed that the abnormal wear is completely removed; and the oil is replaced; the initiator can be put into normal use. If abnormal wear is continued, it is necessary Aborting the application for crash viewing and correction.
2. Damage to the bearing pad by larger particle foreign matter and residual smooth oil:
When large particles of alloy blocks or flakes are found in the oil filter element and the initiating oil sump; the shaft and the bearing bush have been severely damaged; it is necessary to stop the inspection and correction immediately; if it is continuously used, more parts will be damaged. .
The reason for the entry of larger particles is that the parts are not cleaned when the device is installed; for example, the metal chips that occur when processing the inner hole of the connecting rod bushing remain in the oil passage of the connecting rod, the cutting or sediment is stuck in the parts and the oil passage, and the cutting is not completed before the device. Or the machining burrs of the machined parts associated with the moving surface are not removed, the foreign objects with larger particles sticking to the bearing bushings or the outer surface of the shaft are damaged. These images are very serious for the damage of the bearing pads. Carefully clean up and view the device.
The smoothing effect and heat dissipation of the residual smooth oil can not meet the demand; the bearing and the shaft wear are aggravated; the alloy with excessive surface temperature is melted and damaged, and the oil of the residual smooth oil is more blocked. The smooth oil rich in impurities directly enters the moving surface without filtering; further accelerates the damage of the shaft and the bearing bush. Therefore, when purchasing and replacing the smooth oil, the quality of the smooth oil must be strictly controlled according to the rules; the smooth oil is selected according to the rules.
3. Damage to the shaft and bearing pads caused by the movement of foreign objects:
There is a large foreign object between the bearing bush and the inner wall of the hole of the tile device; the movement of the bearing bush will appear convex; when the shaft is working; the abnormal wear will start from the convex point; and expand to the periphery; form the shaft and Early damage of the bearing bush, if there is a large foreign object between the moving surface of the bearing bush and the shaft; the device will be embedded in the alloy layer of the bearing bush after the device; the bearing shaft will also damage the bearing bush, the shaft and the tile and the device hole, etc. If the associated part has bumps and bumps, it will damage or damage the shaft and the tile.
Reasons for occurrence and avoidance: Oxidation or sedimentation of shaft, bearing bush, bushing hole (body, connecting rod); careful inspection of the device before the device; especially the oil passage and the inner lumen of the tubing, it is necessary to stay away from the device. In places where dust is flying and debris is splashed, the equipment used should be clean and hygienic; and the necessary protection measures should be adopted; avoid re-contamination; the smooth oil used in the installation should be hygienic; avoid dust mixing, shafts and bushings and bushing holes. The registration and installation; to ensure that it does not touch any metal objects and must not have any touch operations.
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