The bearing industry seizes this opportunity and makes timely decisions. 'The Ninth Five-Year Plan for the Development and Revitalization of the Bearing Industry', the industry sings the main theme of 'revitalization' and enables the bearing industry to develop high-quality and rapid.

The industry aims at demand, strengthens the supporting capabilities of key mainframes, and cooperates with the localization of imported equipment. A number of substitute imported products have been developed and produced. For example, the matching rate of domestic products required for the main equipment of Baosteel's first phase project has reached 34% in variety and 80% in quantity; railway passenger car bearings developed by the industry have solved temporary quality problems.

The key issue is to reach the level of similar products in the early 1990s; the cylindrical roller bearing for the mud pump was awarded the National Excellent Gold Product Award. The quality of metallurgical, mining, rolling mill, oil drilling rig and military special bearing products is also Significant improvement. A batch of new processes and special equipment and instruments have also been developed, such as the outer spherical bearing rubber cap machine and bearing parts demagnetization cleaning machine developed China INA Bearing Manufacturers by Tianshui Axle Instrument Factory, and the railway bearing special equipment MK7675 CNC double manufactured by Bearing Factory End face grinder, etc.

The bearing industry is determined to develop 'three-car' automobiles, railway passenger cars and trucks, engineering and agricultural machinery vehicles three machines, metallurgical, mining, and petrochemical machinery, during the 9th Five-Year Plan period. Precision machine tools, motors) and 'three highs' high value-added, high-tech Technology, high-precision and high-efficiency special equipment

Bearings and equipment are specific revitalized products, focusing on solving the prominent contradiction between supply and demand, technical difficulties, expanding import and foreign exchange capacity, and improving economic efficiency of bearing products and special process equipment. 

Safety tips: Check the gas and coal dust concentration in explosion-proof areas. 17.The belt conveyor roller has a problem, how to replace the driving roller? Job form: pick list (wash selection). Adjust the counterweight to meet the operational requirements; The lock is in place, the lock is reliable, and the key is kept by the locker.

The lock is in place, the lock is reliable, and the key is kept by the locker. Separate the cleaner and loosen the head tape Job content: Clamp the upper tape with a special tape clamp,mechanical bearings factory separate the cleaner, and move the tape upwards in the direction of the machine head to separate the tape from the roller to form an overhaul space Tools and lifting appliances are complete, applicable, intact, and materials are available. Work sheet: equipment maintenance record (wash selection) How to replace the roller bearing when there is a problem with the belt conveyor roller?

The lower tape is firmly fixed without movement. Adjust the tensioning device Disassemble the protection chain. Job content: the special tape clamp clamps the lower tape, tightens and positions it. Job content: check the specifications and technical parameters of the drive roller. Prepare tools and materials Job content: prepare tools such as wrenches, hand hammers, lifting appliances, and materials, and transport them to the job site. Clean up and check Clean the roller joint surface; Clean and inspect the assembly position of the new roller and coupling and measure the assembly dimensions.

Preparation before class Identify and evaluate hazard sources, implement project safety technical measures, and sign for confirmation; Wear qualified labor protection supplies and hold a certificate to work. Worksheet: Approval form for safety technical measures. Job form: work ticket for power outage (selection) Notify the post operator to test run; the drum runs smoothly without abnormal noise, and the bearing temperature rise does not exceed 35 degrees Celsius; Operation tracking and recording.

Generally, the oil pipe temperature is lower than other pipes.3 Fever caused by improper assembly of the bearing itself The matching between the inner hole of the bearing and the shaft adopts the basic hole system, and the matching between the outer circle of the bearing and the bearing seat hole adopts the basic shaft system. If the inspection and replacement are not timely, it will cause heating, abnormal noise, vibration, etc.

The oil return pipe of the bearing seat is thin, and the temperature is lower in winter, and the oil return becomes slow. After pressing the upper cover, the outer ring of the bearing is deformed and flattened, and the radial clearance becomes smaller or almost zero. Because of the severe friction between the rotor main shaft and the bearing end cover after thermal expansion under working conditions, the high temperature generated in a short time The end cover of the bearing seat and the end face of the rotor shaft are welded together.

Whether it is ordinary bearings or special special bearings, the main engine has high requirements for its life, performance and reliability. When the oil level is marked under the oil mark, the actual measurement shows that the lowest row of balls of the bearing has just touched the oil surface. The process requires that the heating oil temperature is controlled at 80℃～90℃, generally not exceeding 100℃, and not exceeding 120℃ at most. Although the rolling millChina INA Bearing bearings of PY and JY have been specially ordered, due to the unstable quality of domestic large-scale bearing manufacturing, pitting and peeling of the inner surface of the rolling ring still occurred, which caused the bearing to fever and the roller press frequently tripped and stopped accidents., which will lose its lubrication effect and cause the bearing to suffer from high temperature. 1 coal mill reducer is mainly caused by the excessive axial clearance of the bearing and the incorrect tooth surface meshing.

The main reasons for the problems are as follows: The main reason for the initial free end bearing heating and burning is that the outer race is tightly pressed, and the bearing cannot produce axial displacement with the expansion of the main shaft. Because the impeller wears more seriously, the rotor balance is poor after wear, and the fan vibrates greatly, which often causes the bearing to fail prematurely. 

It is used to produce non-concentric or shaft deflection parts between the shaft and the shell, and the alignment parts required by high temperature, low cold, corrosion, and magnetic field non-insulation. Ceramic bearing one-way thrust ball bearing A single thrust ball bearing is composed of a washer-shaped ring with a ball rolling raceway and a cage assembled with the ball. 

Electrically insulated bearings: Because of the high resistivity, they can avoid arc damage to the bearings and can be used in various electrical equipment requiring insulation. Precision instruments and other fields. Ceramic bearing self-aligning ball bearing The outer ring raceway of the self-aligning ball bearing is spherical and self-aligning, which can supplement the error caused by the misalignment and shaft deflection. Generally, glass fiber reinforced nylon 66 (RPA66-25), special industrial plastics (PEEK, PI), stainless steel (AISISUS316), flavonoids (Cu), etc.

From the past, it has only been applied in a small range of high, precise and cutting-edge fields, and has been gradually extended to various industrial fields of the national economy. Third,China roller bearing ceramics are less affected by thermal expansion and contraction than steel, so when the bearing gap is constant, the bearing can be allowed to work in an environment where the temperature difference changes more drastically. 4. Ceramic bearing single row angular contact ball bearing (Technical grades: P4, P5, P6, P0) Angular contact bearings are suitable for high-speed and high-precision rotation, and will not affect their accuracy in high temperature, magnetic field, water, etc.

It is suitable for high-speed rotation, low-noise, low-vibration occasions or high temperature, high cold, corrosion, magnetic field, non-insulation and other fields where steel bearings cannot be used. Ceramic bearing hybrid Ceramic balls, especially silicon nitride balls, have the characteristics of low density, high hardness, low friction coefficient, wear resistance, self-lubrication and good rigidity. 

These screw holes are usually covered with blind plugs and separable bearings such as tapered roller bearings. When unloading a small-diameter bush, it is best to use a stepped punch. The oil is pumped through the oil hole on the tapered shaft to expand the inner ring to disassemble the bearing.

The small diameter of the punch matches the inner hole of the bushing. Several cutouts are provided on the housing shoulders.The punch is made of steel, the top of the hammer is processed into a spherical shape, so that the end contacting the workpiece is usually inlaid with soft metal, such as copper, aluminum, etc. Remove the outer ring of the interference fit.

Tighten the screws evenly while removing them. Use spacers to remove them with a press or gently tap them. Bearings with a large width can only be disassembled by using oil pressure and drawing fixtures together. A method of heating a part in a short time to expand the inner ring before drawing. It is better to use the nut as a stopper China INA Bearings .

The oil pressure method is adopted for the inner ring disassembly of large bearings. The large diameter of the punch is about 0. For the disassembly of large-diameter bushes and rolling bearings, casings are often used.5mm smaller than the outer diameter of the bushing. Disassemble the relatively small bearing with adapter sleeve, support the inner ring with the stopper fastened to the shaft, turn the nut back several times, and use the spacer to knock it off with a hammer.

To remove them from the holes, the method of unloading is also commonly used. When unloading, the hammered end face of the bushing should be cushioned. Sliding bearing bushings and rolling bearing jackets are interference fits in the holes

Cooperating relationship problem: No matter how high the accuracy of the parts is in the processing process, it will never reach 100% of the mating surface of the part. Normal fatigue wear of metal, which is an inherent characteristic of metal itself; Operation and maintenance problems: including poor lubrication of bearings, high operating temperature caused by blockage of the cooling system, loosening of fastening devices, etc.

For a long time, the solutions for bearing wear of high temperature fans are nothing more than the following: repair welding and processing, electric brush plating, thermal spraying, repair welding machining, thermal spraying repair process cannot be implemented online repair, although electric brush plating can achieve online repair , But the requirements for the wear depth are more stringent. Is there a better solution besides that? Soleil carbon nano polymer material technology can realize the wear of high temperature fan bearing position.

Installation problem: The installation position of the bearing cannot be well controlled or the clearance of the bearing cannot be effectively controlled during the installation process, resulting in the bearing cannot be in an optimal state during the running process, and the running resistance increases, the temperature rises, and the torque More acts on the mating surface, causing relative movement between the inner ring of the bearing and the shaft surface, causing wear of the shaft. Under the premise of normal maintenance of the equipment, the service life after repair is even higher than the service life of new parts.

Therefore, the small bearing surface of the mating part is also one of the root causes of metal fatigue and wear; There are many reasons for high temperature fan bearing wear, which can be summarized as the following points: This technology uses the material's unique mechanical properties and targeted repair technology to repair the wear of large shafts such as fans on-line. Case show: high temperature fan: main shaft diameter is 160mm, speed is 1500r/min, the bearing position on the transmission side is worn, the wear width is 80mm, and the wear depth is about 0.

From the microscopic view, the mating surface of metal can only achieve 30%-50%. The advantages of this technology for repairing high temperature fan shaft wear are as follows: Good adhesion, compression resistance, wear resistance, and comprehensive mechanical properties such as elastic deformation of metal to Wholesale Mechanical ball bearing Factory achieve online repair, high repair efficiency, and no A large amount of equipment needs to be disassembled, and the repair is usually completed within 8 hours; This technology is similar to a cold welding technology, which does not generate high temperature during the online repair process, and protects the equipment body from damage, and the repair process It is not limited by the amount of unilateral wear of the shaft; After repair, there will be no metal fatigue and wear during use.5mm.