2013年9月9日星期一
Double row cylindrical roller bearings are divided into two forms:
⑴ NN0000 type double row cylindrical double roller bearing
The bearing structure is compact, small deformation under load, it is particularly suitable for machine tool spindle bearing. Its outer wall, so you can install the outer ring and the inner components, respectively (with roller and cage), does not limit the axial displacement of shaft or housing, the same size and radial single row cylindrical roller bearings , can withstand greater radial load.
⑵ NN0000K type double row tapered bore cylindrical Slewing bearing
This kind of bearing structure is compact, small deformation under load and therefore suitable for machine tool spindle bearing. Bearing bore is tapered to micro adjust the radial clearance.
This kind of bearing outer ring without ribs due, it can be installed separately outer and inner components (with roller and cage), does not limit the axial displacement of shaft or housing, the same size and radial single row cylindrical roller bearings compared to withstand greater radial load.
2013年8月21日星期三
Slewing ring in the course of maintenance
slewing bearing use there will be some problems, the following Xiaobian to introduce you to slewing in use and maintenance.
1, the receipt of the product should be enabled depending on the working conditions and re-filled with new grease.
2, according to the different types of slewing bearings, slewing bearings should be greased regularly,
3, the use of the process should be regularly cleared slewing bearing surface debris, check the slewing ring seal is aging, cracking, breakage or detachment, if one of them happens, seals should be replaced to prevent debris entering the inner raceway and grease loss, replacement grease should be applied accordingly to avoid rolling elements and raceways nap stuck or rusted.
4, because in the course of comprehensive factors, the user can choose according to their own specific situation best grease
7, slewing ring in use, not use water erosion slewing ring and avoid the water into the raceway caused by rust; hard to prevent foreign objects approaching or entering the mating area, so as to avoid tooth injury or unnecessary trouble.
1, the receipt of the product should be enabled depending on the working conditions and re-filled with new grease.
2, according to the different types of slewing bearings, slewing bearings should be greased regularly,
3, the use of the process should be regularly cleared slewing bearing surface debris, check the slewing ring seal is aging, cracking, breakage or detachment, if one of them happens, seals should be replaced to prevent debris entering the inner raceway and grease loss, replacement grease should be applied accordingly to avoid rolling elements and raceways nap stuck or rusted.
4, because in the course of comprehensive factors, the user can choose according to their own specific situation best grease
7, slewing ring in use, not use water erosion slewing ring and avoid the water into the raceway caused by rust; hard to prevent foreign objects approaching or entering the mating area, so as to avoid tooth injury or unnecessary trouble.
Slewing definition and basic structure
slewing bearing in the real industrial applications is very wide, known as: "the machine joints" is required between two objects in relative rotary movement, and the need to bear axial force, radial force, overturning moment of machinery necessary and important driving originals. With the rapid development of the machinery industry, slewing ring in the ship's equipment, engineering machinery, light machinery, metallurgical machinery, medical equipment, industrial robots, tunnel boring machines, rotary stage lighting industry has been widely used.
Slewing usually worm, slewing ring, shell, motor and other parts. As the core components using slewing, it can withstand the axial force, radial force, overturning moment. Its many forms, but basically similar structure and composition.
Slewing usually worm, slewing ring, shell, motor and other parts. As the core components using slewing, it can withstand the axial force, radial force, overturning moment. Its many forms, but basically similar structure and composition.
2013年7月15日星期一
Do need to pay attention to the daily details of bearing maintenance
First, touch
Bearing temperature is often expressed in unusual circumstances. Harmful to the bearing temperature and the lubricating oil. Sometimes, bearing overheating can be attributed to the bearing lubricant and bearing over 125 ℃ temperature in the long run, reduce bearing life, resulting in high bearing the following reasons: lack of lubrication or excessive amount of lubricating oil, lubricating oil containing impurities , heavy duty, bearing damage, lack of space, and seal friction generates heat. Therefore, continuous monitoring bearing temperature is necessary, whether the measure or other important part of the bearing itself. If you are in the business situation has not changed, any change in temperature may be faulty.
Bearing temperature measurement can often help thermometer can accurately measure the temperature of the bearing, and in accordance with degree. Important bearing when it is damaged, it will cause equipment downtime, therefore these bearings should preferably be equipped with a temperature probe. Under normal circumstances, the bearing lubrication and lubricated natural temperature rise and for one day or two.
Second, observe
If you have a good lubrication and bearing right debris and moisture barrier that seals should not wear, but preferably in the open bearing housing to visual inspection and periodic inspection bearing seals, bearing seals around the examination conditions, ensure that sufficient to prevent liquids or corrosive liquids or gases from entering the bearing along the axis. Protection ring and labyrinth seals should be coated with grease to protect its maximum protection. Seals if worn should be replaced soon. Oil sealing function in addition to the bearing to prevent the magazine, and the other function is to keep lubricated bearing housing. If the seal leaks immediately check the seal has been worn or loose oil block. Leak phenomenon may be caused by loose fitting of the bearing box or because adding too much lubricant to form a mixed and leak detection, automatic lubrication system to ensure that the correct amount of lubricant and to examine whether or black, if such a phenomenon, usually say that the lubricant contains magazines.
Third, listen
Using auditory recognition irregular operation is very common approach. For example, with electronic stethoscope to listen to part of the abnormal noise is experienced by method of operation. If it is in good working condition of the bearing will make a low hum of voices. If a sharp hiss, squeaks and other irregular sounds, commonly referred to as the poor working conditions of the bearing. Harsh creaking sound may be due to improper lubrication. Improper bearing clearance may also cause a metallic sound. Dent on the bearing outer ring track will produce vibrations and resulting smooth crisp sound. If the installation of the percussion scars will produce noise, noise will vary with the bearing speed. If there is intermittent noise, rolling element may be damaged. This sound is happening on the surface bearing the date, if the pollutants are often caused by the hissing. Severely damaged bearings will produce irregular and noise.
Bearing damage is listening to consciousness, but usually at this time has come to replace the bearings. Thus, a better way, for example, such as electronic control equipment, diagnostic bearing operating condition.
1: Current bearings are lubricated with grease, running over 1,500 hours, should be timely replacement of grease filling should be noted that the amount of oil required amount, because too little or too much grease will cause the bearing heating, Chong Yu proposed to maintain the amount of fuel in the bearing chamber volume of 1/2 to 2/3 is appropriate.
2: The use of sodium based grease motor bearing (most are of this type), this feature is to grease temperature (125 ℃), drawback is easily dissolved in water, so the lubrication pump is entirely inappropriate.
3: used for holding oil or grease containers should be clean, and usually should be sealed well, do not let dust, iron filings and other debris fell on them, so as to avoid damage to the bearings.
4: Take special note is put into use a new pump for the first time in 100 hours of operation shall be promptly replaced after grease (oil), the next to replace 1 500 hours of operation.
5: For the use of oil-lubricated bearings, the oil should be added to a predetermined position.
Bearing temperature is often expressed in unusual circumstances. Harmful to the bearing temperature and the lubricating oil. Sometimes, bearing overheating can be attributed to the bearing lubricant and bearing over 125 ℃ temperature in the long run, reduce bearing life, resulting in high bearing the following reasons: lack of lubrication or excessive amount of lubricating oil, lubricating oil containing impurities , heavy duty, bearing damage, lack of space, and seal friction generates heat. Therefore, continuous monitoring bearing temperature is necessary, whether the measure or other important part of the bearing itself. If you are in the business situation has not changed, any change in temperature may be faulty.
Bearing temperature measurement can often help thermometer can accurately measure the temperature of the bearing, and in accordance with degree. Important bearing when it is damaged, it will cause equipment downtime, therefore these bearings should preferably be equipped with a temperature probe. Under normal circumstances, the bearing lubrication and lubricated natural temperature rise and for one day or two.
Second, observe
If you have a good lubrication and bearing right debris and moisture barrier that seals should not wear, but preferably in the open bearing housing to visual inspection and periodic inspection bearing seals, bearing seals around the examination conditions, ensure that sufficient to prevent liquids or corrosive liquids or gases from entering the bearing along the axis. Protection ring and labyrinth seals should be coated with grease to protect its maximum protection. Seals if worn should be replaced soon. Oil sealing function in addition to the bearing to prevent the magazine, and the other function is to keep lubricated bearing housing. If the seal leaks immediately check the seal has been worn or loose oil block. Leak phenomenon may be caused by loose fitting of the bearing box or because adding too much lubricant to form a mixed and leak detection, automatic lubrication system to ensure that the correct amount of lubricant and to examine whether or black, if such a phenomenon, usually say that the lubricant contains magazines.
Third, listen
Using auditory recognition irregular operation is very common approach. For example, with electronic stethoscope to listen to part of the abnormal noise is experienced by method of operation. If it is in good working condition of the bearing will make a low hum of voices. If a sharp hiss, squeaks and other irregular sounds, commonly referred to as the poor working conditions of the bearing. Harsh creaking sound may be due to improper lubrication. Improper bearing clearance may also cause a metallic sound. Dent on the bearing outer ring track will produce vibrations and resulting smooth crisp sound. If the installation of the percussion scars will produce noise, noise will vary with the bearing speed. If there is intermittent noise, rolling element may be damaged. This sound is happening on the surface bearing the date, if the pollutants are often caused by the hissing. Severely damaged bearings will produce irregular and noise.
Bearing damage is listening to consciousness, but usually at this time has come to replace the bearings. Thus, a better way, for example, such as electronic control equipment, diagnostic bearing operating condition.
1: Current bearings are lubricated with grease, running over 1,500 hours, should be timely replacement of grease filling should be noted that the amount of oil required amount, because too little or too much grease will cause the bearing heating, Chong Yu proposed to maintain the amount of fuel in the bearing chamber volume of 1/2 to 2/3 is appropriate.
2: The use of sodium based grease motor bearing (most are of this type), this feature is to grease temperature (125 ℃), drawback is easily dissolved in water, so the lubrication pump is entirely inappropriate.
3: used for holding oil or grease containers should be clean, and usually should be sealed well, do not let dust, iron filings and other debris fell on them, so as to avoid damage to the bearings.
4: Take special note is put into use a new pump for the first time in 100 hours of operation shall be promptly replaced after grease (oil), the next to replace 1 500 hours of operation.
5: For the use of oil-lubricated bearings, the oil should be added to a predetermined position.
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