Views: 3 Author: Site Editor Publish Time: 2011-02-28 Origin: Site
Many users do not know much about the reasons for diesel generator sets 'pull cylinder' or 'pull cylinder'. Technical personnel from Haixing generator set manufacturers have come to popularize the technical knowledge of diesel generator set cylinder pulling to GF users:
1. What is 'pull cylinder'?
'pull the tank' Some people also call it 'bite the tank'. It is a striped, colored damage that occurs along the piston movement direction on the surface of the cylinder and the piston ring. Many of Haixing’s customers are very troublesome to pull the cylinders of diesel generator sets. When the cylinder is pulled, the wear of the cylinder liner is very severe, which can reach dozens or even hundreds of times the normal wear.
After the cylinder is pulled, the external feature of the diesel engine pulling steel is that the sound changes and the exhaust gas emits black smoke. The consequence is that the working surface of the piston, piston ring and cylinder liner are damaged, the gas seal is ineffective, and the oil consumption and gas bleeding volume increase rapidly, causing the engine to not operate normally. In a very short time, the piston, piston ring and cylinder liner are stopped due to the bite.
2. What are the reasons for the 'pulling cylinder'?
The main reason for pulling the cylinder is actually the 'welding' strain of the piston, piston ring and cylinder liner surface due to high temperature. That is, the piston does not cause dry friction between the cylinder liner due to the interruption of the oil film. The hot friction heat causes the metal to micro-melt and stick, and pulls off nearby metal particles. The fundamental reason for the pulling cylinder is the interruption of the oil film. According to the requirements of gas sealing, the gap between the piston ring and the cylinder liner should be as small as possible, which makes their lubrication conditions very unfavorable. The friction between the cylinder liner and the piston ring depends on the elastic force of the piston ring, working temperature, sliding speed, oil film distribution, parts quality and running-in conditions, etc. When the contact surface is overloaded, the cylinder liner surface and the piston ring working surface are violently rubbed due to direct contact, resulting in a large amount of friction heat, causing the temperature of the working surface to rise sharply, and the consequence is that the two friction surfaces are welded and adhered to cause strain.
It can be seen that poor oil supply conditions, severe air leakage, and excessive contact stress of parts destroying the oil film are the main reasons for the cylinder pulling. In addition to lubrication, fitting gaps, and parts manufacturing quality, using the unloaded cylinder may also cause the cylinder to be pulled. Specifically, there are the following points:
1. The matching clearance between the piston and cylinder liner is too small, or has not been well run-in before formal loading.
2. Poor lubrication, such as small gap, thin oil or unoiled during assembly.
3. The diesel engine is overheating.
4. The body is not clean during assembly or the piston is too dead.
5. The piston and piston rings have poor quality.
From the perspective of use, you should also pay attention to avoid sudden increase in load or emergency stop. Before starting, try to use a shaker to rotate the crankshaft several times to keep the friction surface lubricant.
