The oil flowing out of the axial direction of the mountain machine is flowed back through the hole by the oil slinger. The outer ring with the oil ring is redesigned on the outside of the gland, and an oil seal is designed and installed to prevent dust.
The height of the boss of the gland is increased correspondingly with the bearing housing. The thickness of the bearing seat is increased, so that the distance between the bearing and the end face (height difference) is increased, so that the gland bosses actually play a positioning role.
The improved vibrator seal has been installed and put into use since the year of the year. After more than half a year of operation and use, II. Fear two. The term eccentric shaft isolation ring. 3 oil seal gland. 5 bearing housing screen box tomb board intermediate casing bearing seal ring diagram improved vibration 啼 exciter seal ring vibration exciter sealed well, effectively eliminate the phenomenon of oil slick, the consumption of oil is significantly reduced, the appearance of the equipment is improved.
Since the improved sieve has been used since the month of the month, the vibrating screen has operated smoothly.
In the past, the service life of the bearing was from month to month. Now the life of the sieve bearing has been more than doubled and the operation is still normal.
After the improvement of the bearing seat seal, the service life of the vibrating screen bearing is greatly improved, which not only reduces the consumption of oil, but also reduces the workload of maintenance and replacement of the bearing and the time of production stoppage, thereby eliminating the phenomenon of leakage of equipment and improving The equipment operating rate.
The date of the mouth, a cat, a stalk, a sputum, a sputum, a sputum, a sputum, a sputum, a sputum, a sputum, a sputum, a sputum, a sputum
Peixing Jinchuan Nonferrous Metals Co., Ltd. Concentrator, Ganmu Jinchangchuan Second Plant, Milling and Floating Workshop, the existing scoop type air compressor, which is used to supply the pneumatic sluice type feeder and grinding pneumatic clutch for the system. Compressed air.
The air compressor is a two-stage two-cylinder single-acting piston compressor, and belongs to an electric water-cooled fixed air compressor.
Under the rated working condition, the gas enters the first-stage cylinder from the air filter, and is compressed to the intermediate cooler. After cooling, it enters the secondary cylinder and is compressed into the input gas storage tank for use. The flow rate is the air compressor for the year. Since it was put into use, the crankshaft connecting rod of the air compressor has been killed and the piston ring has been stuck. The number of dry grinding of the cylinder is frequent, the oil needle is often broken, the pressure at each level is often abnormal, and the valve has abnormal noise. Wait.
These failures not only greatly reduced the service life of many components of the air compressor, but also significantly increased the consumption of spare parts, and increased the labor intensity for the maintenance workers and affected the efficiency of the air compressor.
Therefore, properly handling these faults is a necessary condition to ensure the normal operation of the air compressor.
Common causes of failure The crankshaft connecting rod is killed. The crankshaft of the air compressor is made of ductile iron (the rolling bearing is mounted on both ends of the single crankshaft, the flywheel is mounted on the shaft end, and it is connected with the elastic coupling.
The connecting rod has a cross-section of an I-shaped shape, and the small-headed hole is internally pressed with a bushing. The large head is symmetrically divided into two bodies, the bearing inner alloy is cast on the inner surface of the connecting rod, and the connecting rod is an open structure, which is integrally connected by a connecting rod bolt.
When repairing the crankshaft connecting rod, the axial clearance between the crankshaft and the bearing cap, the returning degree of the crankshaft diameter, the radial clearance of the crankshaft diameter and the connecting rod, and the between the connecting rod bushing and the piston pin The radial clearance and the like often neglect the important steps of making necessary measurements and adjustments to them, so that the matching clearances are beyond the respective specified ranges. In addition, the connecting rod bolts are not tightened in time when they are loose.
These factors are the main causes of the crankshaft connecting rod.
Reasons for dry grinding of the cylinder The replacement of the cylinder does not carefully adjust the assembly clearance between the cylinder and the piston according to the regulations. The clearance is small, resulting in increased wear between the piston and the cylinder, and the piston pin is easy to be thrown out.
In addition, when the piston is at the top dead center, the gap between the top surface and the lower plane of the cylinder head is also often in a small state. If it is not adjusted in time, the top of the piston collides with the cylinder head.
This will inevitably cause dry grinding of the cylinder.
The piston ring is stuck. The first and second pistons of the air compressor are equipped with a gas ring and a scraper ring. The piston pin is floatingly mounted in the piston. There are spring retaining rings at both ends to prevent the piston pin from being pulled out. .
When replacing parts such as piston piston rings and oil scrapers, we often neglect the adjustment of their assembly clearances, so that the thermal clearance of one (two)-stage piston ring scraper ring in one (two)-stage cylinder is too small. And the axial clearance of the one (two) stage piston ring scraper ring in the (two) stage piston groove is also too small, which will certainly aggravate the wear of the piston ring, resulting in the impact of the piston ring in the ring groove during operation. Thereby the piston ring is stuck.
The reason why the oil pin is broken is that the machine is spray-lubricated, and the oil pin is mounted on the big end of the connecting rod. When the crankshaft rotates, the oil pin will open the oil surface and splash the oil to the rubbing parts. Each rubbing surface is lubricated.
Because the operator did not properly maintain the air compressor according to the relevant regulations, the oil level was too low or too high, and the same grade of compressor oil was used in winter and summer, which made the oil needle easy to break.
The pressure of the various levels is abnormal and there is an abnormal sound in the air. The intake and exhaust valves of the air compressor adopt the annular valve structure. The first air valve is a four ring piece and the second stage air valve is a two ring piece.
Due to the harsh working environment of the air compressor, there are many dusts on the site, which often causes dirt on the valve seat of the intake and exhaust valve. The air filter is blocked more seriously, and the valve or spring of the intake and exhaust valve is damaged. There is a leak, which leads to a high or low pressure in the first and second stages, and there is often an abnormal sound in the intake and exhaust valve groups.
In addition, if the gap between the valve plate and the valve cover is too large, the gap is not adjusted in time when the intake and exhaust valve group is not pressed, or the valve housing cover nut is tightened, which may cause abnormal pressure at various stages and the valve has Abnormal noise.
Improper maintenance and overhaul is also one of the main reasons for frequent declines. (1) Responsibility is not strong, and it is not possible to strictly abide by the conditions of use of air compressors. The air compressors on the site are poorly cleaned and lubricated.
(2) The quality of the air compressor is poorly checked, and the problems found in the usual inspections are often not completely solved.
(3) The tomb foundation work of air compressor management is not perfect.
Handling measures All assembly rooms should meet the requirements before installing all components such as crankshaft pistons and connecting rods. They should be cleaned and then assembled after drying. During the assembly process, the assembly clearances must comply with the regulations. See the table to strengthen the daily maintenance work of the space-time press (l) to set the operating procedures standards for the air compressor for the post workers, and to carry out standardization operations, the workers in the production position must follow the prescribed time and time, the person with the regulations, according to the regulations The program completes the prescribed actions to standardize the work behavior.
Strengthen the inspection of the air compressor to clean and tighten the work.
Formulate management standards for air compressors, strengthen the daily management of air compressors, and solve problems found in inspections in a timely and thorough manner. Improve the quality of maintenance.
Before each inspection, a thorough inspection should be carried out to find the problem, eliminate the hidden dangers of the equipment as much as possible, and establish a tracking account for the quality of the air compressor maintenance.
(4) Gradually improve the basic work of air compressor management.
Establish a relatively complete air compressor file development, strengthen the dynamic record operation record and repair record of the air compressor, and move the head of the mine. Cylinder's fit clearance sand first stage piston ring scraper ring thermal gap in the cylinder secondary piston ring scraper ring in the cylinder a thermal gap level piston ring scraper ring in the piston groove axial clearance crank shaft The radial clearance of the diameter and the connecting rod tile, the axial clearance of the crankshaft, the radial clearance of the piston pin and the connecting rod bushing, the first step of the valve, the secondary valve lift, and the piston at the top dead center, the top surface of the piston The clearance of the lower plane of the cylinder head is the cylindricity of 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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