Head mine machine city table paper number one part nominal size regulation gap first stage piston gas rainbow matching clearance to fit one or two piston cylinders fit clearance sand first stage piston ring scraper ring in the cylinder heat gap secondary piston ring scraping oil The ring in the cylinder is a thermal gap. The piston ring scraper ring in the piston groove. The axial clearance is the radial clearance of the shaft diameter and the radial clearance of the connecting rod. The axial clearance of the crankshaft is the diameter of the piston pin connecting rod bushing. To the clearance of a first-stage valve, the secondary valve lifts a piston at the top dead center, and the gap between the top surface and the lower plane of the cylinder head is the cylinder of the first-class cylinder. 0 crank shaft diameter group occupancy degree PA reading a welding repair repair air compressor large belt pulley I Xu Jiangyu Lai marriage group Xiangnan mining company machine repair plant Shandong mine type air compressor large pulley (diameter is the material is gray cast iron During the overhaul of the year, it was found that the web had a long crack (as shown in the figure that one end of the crack is close to the root of the groove, if it continues to be used, the crack is likely to further develop, thus causing the pulley to be scrapped.
We decided to repair the pulley.
The repair welding process is a few rules in order to accurately grasp the technical status of the air compressor and develop a repair and maintenance plan.
It is necessary to implement a strict handover system.
Proper use of compressor oil lubricants in winter compressor oil, summer 19 compressor oil, normal operation, depending on the cleaning of the lubricant to determine whether to replace.
The physicochemical properties of the compressor oil should meet the requirements (see Table Content No. Oil No. Oil viscosity PCT value one oxidation oxidized stability value oxidized precipitation is not greater than ash water-soluble acid and alkali no mechanical impurities moisture no flash point corrosion test years old domestic The welding rod used for repair welding of cast iron has a large weld repairing rigidity and is prone to cracks, and the welding process is difficult to grasp.
Casting and casting have good welding performance and good crack resistance, but they are expensive.
In combination with the specific conditions of our mine, it was decided to use the welding electrode instead of the cast iron electrode (AC manual arc welding), and take corresponding measures to prevent cracking during the welding process.
The process flow is to drill the crack hole, open the groove, clean and weld.
Figure crack position circle table nominal size n allow wear (first-stage piston cylinder fit clearance pseudo-stage piston gas rainbow fit clearance household level piston ring scraper ring in the cylinder. 20 hot gap secondary piston bad The scraping oil ring is in the heat gap in the gas rainbow. The piston ring scraping ring in the piston groove is in the axial groove of the piston groove. The radial clearance of the shaft diameter and the radial clearance of the connecting rod tile is the radial gap of the piston pin connecting the village bushing. The cylinder of the cylinder is like the cylindricity cup of the cylinder of the secondary cylinder. The rupture hole of the cylinder is drilled at the ends of the crack.
Open the groove with the grinding wheel. Cleaning the wire brush to the periphery of the part to be welded to expose the metallic color, and wipe the area to be welded and its periphery with acetone. Pre-heating of the welded parts before welding is applied to reduce the penetration and heat input. The welding current should be controlled to the left and right. The welding rods are used for the welding rods and dried before the welding to prevent stress concentration. When welding, the segmented short arc narrow and short weld bead is used. (25 and multi-layer welding and intermittent welding, the interlayer temperature is cooled to the following to continue welding. After each welding, the weld should be gently tapped to relax the stress. Prevent cracks.
After the pulley was repaired by the above method, in the operation of the past two years, no abnormality occurred, and the normal operation of the production operation was ensured.
The date of receipt of the manuscript is a pot of open search and turn over the mouth of the girl. From the country to stay in the rough, the shirt is plunged, the eye is trapped, the class is well, the bed is kept, the paper is numbered, and the daily inspection and annual inspection of the air compressor are done. The sediment in the cooler gas storage tank should be discharged to the next time (in summer or when the air humidity is high, it should be discharged for one hour and the air bolts of the air compressor should be checked regularly.
Check the intake and exhaust valves every month to see if the valve springs and bolts in the valve are damaged.
Every six months, the air filter connecting rod big head tile small head shirt sleeve and other parts should be thoroughly cleaned to check the wear condition of the cylinder piston piston ring once, and the well check pressure gauge safety valve.
Every year, the air compressor should be thoroughly inspected, and the cleaning cooler measures the wear of the friction parts and records.
The allowable wear limit of the main friction part of the air compressor is shown in the table. The date of receipt of the vibration of the vibration motor bearing and the measures of the Bureau of Liu Rirong, the peak of the Barry plant, the southwestern Danfeng Company, the Barry plant began to use high-frequency vibration fine screen, The fine-grained vibration motor model is a power rated speed for the excitation force to be used. It is found that all the vibration motor bearings are hot (the temperature of the bearing is high, the bearing is easy to lock and the motor is burnt.
For the above situation (l), the axial clearance of the bearing should be properly adjusted.
The vibration motor bearing model is a single row radial short cylindrical roller bearing.
The axial positioning of the motor shaft is sufficient
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