After the compressor was replaced and replaced by the three-stage inlet air valve, it was put into operation for less than 2 hours. An abnormal sound occurred in one cylinder, and the main current increased from 135A to 140A. The sound in the cylinder became louder, and the vibration of one cylinder was intensified. The inspection of the piston found that the PTFE bearing ring was biased at a 30-degree angle with the center of the piston; one of the three piston rings (material JT20-40B) was broken, and the other two were all trapped in the ring groove and became a dead ring. The piston ring groove is filled with the molten aluminum piece, and the support ring groove also has a partially melted aluminum piece; the upper part of the first half piston wears a large amount, and is 6 mm deep as seen from the end face, and is terminated by a fan-shaped distribution about 200 mm in the axial direction. Because the wear part of the piston body is directly above the piston, it has no effect on the axial balance. Therefore, only the cylinder recessed part is deburred; the front half piston end face is roughed on the C650 lathe, and the feed amount is about 1mm, which is mainly to solve the high temperature. Deformation of the edge region is formed to restore the axial balance of the piston body. The ribbed belt is perpendicular to the sliding surface, which is good for scraping oil, so that the sliding surface brings out a very thin oil film. When the piston rod returns, the oil film is completely recovered due to the angular action of the sliding ring, so that the lubricating oil cannot reach the cylinder, thereby achieving no Oil lubrication. On the other hand, the extremely thin oil film has a large viscosity on the low pressure side of the packing, and it is not only difficult to enter the high pressure cylinder end, but also has an auxiliary sealing performance.
Oil-free lubricating compressors require packing seals to ensure certain elastoplasticity, follow-up, chemical stability, impermeability, self-lubricity and high temperature resistance of the seal. Therefore, the design of the packing seal is important for achieving oil-free lubrication. Next, the bypass valve of the original air compressor and the control air pipe, the pressure reducing valve and the suction valve are removed and the plug is plugged, and the original main air pipe is connected to the lower part of the screw air compressor. Finally, a modified tube and a ball valve are added to the modified main air duct (ie, the lower part of the unloading valve), and the outlet is placed on the left side of the dry drilling machine, so that when the air compressor is dry, the ball valve is first opened, and then the load reducing rod is pushed. When the wind pressure rises, the ball valve is closed, and it is also convenient for observing the oil with the wind in the future.
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