How to calculate the tightening force of turbine Bush
Publish: 2021-04-23 05:29:33
1. Divided into what kind of tile: generally round tile or oval tile, the provisions are different. The tightening force is the tightening force of ball bearing bush or bearing body.
2. The tightening force of bearing bush has clear requirements in the assembly drawing of bearing bush. Generally, the tightening force of cylindrical bearing is 0.10 ~ 0.15 mm, and that of spherical bearing is 0.03 ~ 0.07 mm< The measuring steps are as follows:
1. Assemble the upper and lower half bearing shells and fasten the bolts on the joint surface
2. Place two lead wires with a diameter of 1 mm at the top pad iron (the top of the spherical shell for spherical shell)
3. Put four uniform networks of 0.5mm stainless steel plates in front of and behind the joint surfaces of bearing blocks on both sides of the bearing bush
4. Fasten the bearing covers and tighten the bolts on the joint surfaces evenly
5. Use a feeler gauge to check whether there is a uniform clearance of 0.5mm at the four corners of the joint surface
6. Loosen the bolts and lift off the bearing cover
7. Measure the thickness of flattened lead wire, take at least three points for each lead wire, measure three values, and take the average value, and then calculate the average value of two lead wires. The tightening force is equal to the average value of gasket thickness minus lead wire thickness.
1. Assemble the upper and lower half bearing shells and fasten the bolts on the joint surface
2. Place two lead wires with a diameter of 1 mm at the top pad iron (the top of the spherical shell for spherical shell)
3. Put four uniform networks of 0.5mm stainless steel plates in front of and behind the joint surfaces of bearing blocks on both sides of the bearing bush
4. Fasten the bearing covers and tighten the bolts on the joint surfaces evenly
5. Use a feeler gauge to check whether there is a uniform clearance of 0.5mm at the four corners of the joint surface
6. Loosen the bolts and lift off the bearing cover
7. Measure the thickness of flattened lead wire, take at least three points for each lead wire, measure three values, and take the average value, and then calculate the average value of two lead wires. The tightening force is equal to the average value of gasket thickness minus lead wire thickness.
3. No matter which manufacturer proces the bearing bush clearance, it must be three thousandths of the shaft. That is to say, the diameter of your shaft is 350mm, so the top clearance is about 1.05mm. As for the tightening force, it depends on the manufacturer, and the manufacturer, some are interference, some are clearance. The specific amount depends on the drawing!
4. 1 2 3 4 5
spherical tightening force 0.00-0.02 0.00-0.02 0.00-0.02 0.00-0.02 0.00-0.02 0.00-0.02
top clearance 0.34-0.44 0.46-0.58 0.46-0.58 0.42-0.52 0.42-0.52
side clearance 0.37-0.42 0.49-0.55 0.49-0.55 0.45-0.50 0.42-0.50
spherical tightening force 0.00-0.02 0.00-0.02 0.00-0.02 0.00-0.02 0.00-0.02 0.00-0.02
top clearance 0.34-0.44 0.46-0.58 0.46-0.58 0.42-0.52 0.42-0.52
side clearance 0.37-0.42 0.49-0.55 0.49-0.55 0.45-0.50 0.42-0.50
5. It is the pressing force of the bearing seat on the upper cover of the bearing bush, which is usually expressed by the number of passes (one hundredth of a millimeter) of the interference amount. The detection method is as follows: the copper skin is added on the split surface, and the lead wire is pressed between the upper cover of the bearing bush and the bearing seat to measure, and the tightening force = the thickness of the copper skin - the thickness of the lead wire after flattening.
6. Motor power: kW
number of power teeth:
number of passive teeth:
belt model:
center distance:
number of power teeth:
number of passive teeth:
belt model:
center distance:
7. The tightening force of bearing bush has clear requirements in the assembly drawing of bearing bush. Generally, the tightening force of cylindrical bearing is 0.10 ~ 0.15 mm, and that of spherical bearing is 0.03 ~ 0.07 mm. To measure the tightening force, the method of pressing lead wire is used. The measuring steps are as follows: 1. Assemble the upper and lower half bearing shells and fasten the bolts on the joint surface; 2. Place two lead wires with a diameter of 1 mm at the top pad iron (the top of spherical shell); 3. Put four uniform 0.5mm stainless steel sheets on the front and back of the joint surface of bearing blocks on both sides of the bearing bush. 4. Fasten the bearing cover and tighten the bolts on the joint surface evenly; 5. Use a feeler gauge to check whether there is a uniform clearance of 0.5mm at the four corners of the joint surface; 6. Loosen the bolts and lift the bearing cover; 7. Measure the thickness of flattened lead wire, take at least three points for each lead wire, measure three values, and take the average value, and then calculate the average value of two lead wires. The tightening force is equal to the average value of gasket thickness minus lead wire thickness.
8. Figure: (the network knows that you can't upload pictures, please contact me if you need), give you a program for all maintenance and adjustment of turbine thrust pad, which is more direct and profound than adjusting clearance alone, but it's a pity that you can't upload clearance identification diagram
1.1.1 thrust bearing maintenance
1.1.1.1 disassembly of thrust bearing:
a oil cup intermediary on thrust bearing cover, remove thermometer, Remove the flat head fastening screw, screw out the cover, take out the transparent cover and outer cover, and finally screw out the oil cup
b pull out the vertical pin on the high pressure side of the thrust bearing cover and two locating pins on the split surface
C loosen the nuts on the horizontal joint surface and lift out the bearing cover
d remove the bolts on the horizontal joint surface of the inner cover of the thrust pad, lift the inner cover of the bearing evenly by about 30-40mm with the buttress screws, and then lift off the bearing cover
e loosen the bolts on the horizontal joint surface of the ball pillow, pull out the taper pin, lift the ball pillow with a special lifting ring, and remove the lead wire of the thrust pad thermometer
F loosen the pull-up spring of the oil retaining ring and take out the two half oil retaining rings (after modification, it is a floating ring oil retaining ring, which can be taken out by removing the flat screw)
G remove the plane bolts of the thrust pad mounting ring, take out the upper half of the thrust pad mounting ring in positive and negative directions, and then dig out the lower half of the thrust pad mounting ring in positive and negative directions
1.1.1.2 measure the clearance of thrust pad:
a when the thrust bearing is assembled, cover the outer cover of the thrust bearing, drive in the taper pin, and tighten the horizontal split bolt
b a dial indicator is installed on the thrust bearing shell, and the measuring rod is supported on the thrust ball pillow and parallel to the shaft to measure the axial movement of the pad pillow
C another dial indicator measuring rod is supported on a plane of the rotor and parallel to the axis. Use two jacks to turn the rotor back and forth to the front and rear limit positions, and read out the maximum and minimum indication values of the dial indicator. The difference of the rotor dial indicator is the total displacement, and the displacement minus the movement of the pad pillow is the clearance of the thrust pad, which can be solved by adjusting the axial adjusting ring gasket outside the pad pillow
1.1.1.3 check the thrust pad:
a check the black gold working face of the pad, measure the thickness of the pad and compare it with the original value. If it is abnormal, find out the cause and make necessary treatment
b check the swing line and pin on the back of the pad, and check the swing of each pad after the combination of the thrust pad
C check the temperature measuring elements and wires
d check the wedge-shaped oil inlet clearance of the thrust pad:
put a steel tape on the black gold surface of the pad, measure the oil clearance of the wedge-shaped outer opening with a feeler gauge, and observe whether the shape of the oil clearance meets the drawing requirements according to the contact marks on the black gold of the bearing
e check the contact condition on the flat plate after the combination of tile blocks
1.1.1.4 check the oil baffle ring and clearance
1.1.1.5 check and adjust the clearance of oil ring of oil return baffle (according to the adjustment method of oil baffle in bearing bush)
1.1.1.6 check the shell and accessories of thrust bearing
1.1.1.7 assemble in reverse order according to the disassembly procere. After assembly, retest the clearance of thrust pad and check whether the assembly is correct
1.1.2 check the insulation of generator rear bearing and exciter bearing pedestal. In order to prevent the electric corrosion of bearing bush caused by shaft current ring operation, install insulation layer (including bolt, insulating sleeve and gasket) between generator rear bearing, exciter bearing pedestal bottom and oil pipe flange:
1.1.2.1 measure the insulation resistance after the adjustment of turbine generator center
1.1.2.2 lift the generator rotor about 10 mm with crane
1.1.2.3 use insulating cloth or green paper with thickness of about 0.5mm to pad between the journal and the bearing bush, so that the shaft and the bearing bush are completely separated
1.1.2.4 use a 500V megger to measure the resistance of bearing pedestal to ground
1.1.2.5 if it is found that the resistance is less than the specified value, it should be decomposed step by step to find out the cause. Generally, the oil pipe can be removed first, and then the seat frame bolts can be loosened one by one until the bearing seat is lifted and the gasket is checked again
1.1.3 tighten the foundation foot bolts (for items that are not frequently repaired, the foot bolts of each bearing pedestal shall be inspected every overhaul, and the foot bolts shall be tightened once every overhaul or vibration of the unit)
1.2 quality standard
1.2.1 the surface of bearing alloy is smooth, without tire shedding, chipping, crack corrosion, overheating and abnormal wear
1.2.2 bearing clearance (mm)
oil clearance on both sides of the first bearing (￠ 300): 0.20-0.30
top oil clearance: 0.30-0.55
jacking oil clearance: 0.02-0.04
jacking oil area: 35 × 45
oil gap on both sides of the second bearing (￠ 325): 0.25-0.35
top oil gap: 0.45-0.60
jacking oil gap: 0.02-0.04
jacking oil area: 40 × 55
oil gap on both sides of the third bearing (￠ 325): 0.25-0.35
top oil gap: 0.45-0.60
jacking oil gap: 0.02-0.04
jacking oil area: 40 × 60
oil gap on both sides of the fourth bearing (￠ 300): 0.20-0.30
top oil gap: 0.30-0.55
jacking oil gap: 0.02-0.04
jacking oil area: 45 × 65
oil gap on both sides of the fifth bearing (￠ 160): 0.10-0.15
top oil gap: 0.15-0.25
jacking oil gap: 0.02-0.04
jacking oil area: 45 × 65
1.2.3 the contact between the journal and the lower bush is uniform, the contact angle is about 60 degrees, and the wedge clearance of 0.02mm between the two ends of the Bush and the journal is kept within the range of 5-10mm, so as to avoid causing axial vibration
1.2.4 oil baffle clearance mm
A: 0.30-0.5
b: 0.08-0.14
C: 0.1-0.32
D: 0.1-0.30 see figure "oil baffle clearance"
1.2.5 the inserted teeth are not loose, and there is no through groove or opening on the horizontal joint surface (0.05 feeler gauge cannot be inserted)
1.2.6 tightening force or clearance:
1.2.6.1 tightening force between pad pillow and spherical shell 0-0.02mm
1.2.6.2 tightening force between spherical shell and ball pillow 0-0.02mm
1.2.6.3 tightening force between ball pillow and bearing cover 0.10-0.15mm
(the above tightening force values are e values under running state, and the specific installation value should be appropriately corrected according to the internal and external temperature difference of each bearing; That is to say, the bearing with high shell temperature should increase the tightening force appropriately.)
1.2.7 the contact trace of each pad iron of tile sleeper shall account for more than 70% of the total area and be evenly distributed. There shall be no more than four gaskets in each pad iron of tile sleeper, and the thickness shall be uniform and flat without burr
1.2.8 after lifting the rotor, there are two shim feelers on the left and right of the ball pillow, which can be 0.05-0.07mm at the bottom
1.2.9 tile pillow: spherical shell, tile pillow joint surface contact is good, 0.03mm feeler gauge can not be inserted, red lead powder inspection contact area is not less than 75%, and contact is even
1.2.10 the oil inlet and outlet of bearing seat shall be unblocked and clean, and the oil chamber shall be clean and free of impurities
1.2.11 the joint surface of the seat cover is flat and smooth without through mark
1.2.12 the jacking oil pipe is clean and free from leakage
1.2.13 the black gold surface of the thrust pad is complete, without cracks, peeling off, tire shedding, wear, electric corrosion marks, overload whitening, overheating melting, or other mechanical damage, and the working marks of each pad are roughly uniform
1.2.14 the thickness of thrust pad is generally 1.50 ± The thickness of the pad is 0.10 mm, and there is no obvious wear compared with the original record. The wedge-shaped oil gap area of the pad meets the requirements of the drawing, and the inlet gap is 0.50 mm
1.2.15 the inner and outer arcs and pin holes of the pad tire have no wear marks, the swing support line has no obvious wear, and the pad can swing freely along the cycloidal line after assembly
1.2.16 thrust pad shaft seal clearance (mm)
A: 0.04-0.12
b: 0.04-0.12
b: 0.04-0.12 δ 1 (working face) 0.10
δ 2 (non working face) 0.50
1.1.1 the floating ring seal oil retaining ring on both sides of thrust pad is assembled correctly, and the pull spring is not seriously deformed. The upper half and the lower half of the thread slots are matched with each other. There is no peeling, crack or peeling in Wujin. After assembly, use a 0.03mm feeler gauge to check that there is no gap on the split
1.1.2 axial clearance of thrust pad is 0.04-0.06mm; The movement of tile pillow is ＜ 0.05mm
1.1.3 under the condition of full combination, the impression area of the thrust pad in contact with the thrust disc shall not be less than 75% (each pad is approximately equal and evenly contacted)
1.1.4 the matching between the locating pin and the hole on the joint surface of the thrust bearing shell shall not be loose or bent; the upper and lower halves of the shell shall not be dislocated
1.1.5 the opening of oil return regulating valve of thrust pad meets the requirements of normal oil return volume (the pad temperature is normal ring operation)
1.1.6 after assembly, there is no garbage in the thrust pad
1.1.7 after assembling, the tension spring of thrust bearing oil baffle ring should be lengthened by 58-65mm to ensure that the upper and lower split surfaces of oil baffle ring are closed
1.1.8 the insulating plate at the bottom of the bearing pedestal shall be clean and free of oil dirt (it is better to use two layers of insulating plates and stack them alternately with steel gaskets in a tower shape, and the insulating gaskets shall be cleaned and dried with gasoline or acetone). After combination, the insulation value is greater than 1 megohm
1.2 precautions
1.2.1 when lifting out the bearing cover or ball pillow, pay attention to check whether there are gaskets on the plane or top of the spherical shell. If there are gaskets, measure the thickness, make records and keep them properly
1.2.2 before the first bearing is lifted out, the speed regulating part cover should be lifted first
1.2.3 when lifting the low pressure rear bearing cover, remove the vertical bolts on the upper half of the outer oil stop of the low pressure bearing first, and then take out the oil stop after lifting out the bearing cover
1.2.4 for cylindrical and oval bearing bush, the tightening force of Bush Bush should be adjusted before pressing oil clearance
1.2.5 when the oil gap is measured by pressing the blue lead wire, the position of the blue lead wire should avoid the oil return groove on the top of the upper tile
1.2.6 if the oil gap of bearing bush is not correct, it should not be handled blindly. It should be handled according to previous records and after finding out the cause
1.2.7 at present, the bridge gauge is not supplied by the manufacturer. Each manufacturer should make the bridge gauge by itself and mark the unit number and bearing number on the bridge gauge. During the measurement, place the feeler gauge stably according to the marked position, use no more than three feeler gauges, press the feeler gauge tightly on the journal and move it gently in the clearance, which shall be subject to the condition that the feeler gauge just touches the flange of the bridge gauge and can pass through the clearance
1.2.8 when the outer oil stop and the bearing seat are fastened with bolts, the screw hole shall not be connected with the oil chamber to avoid oil leakage from the thread. When the upper and lower clearance of the oil stop is adjusted by scraping the plane, too much scraping shall not be done to avoid too large file of the fixing screw hole and oil leakage from the screw hole
1.2.9 when twisting the copper teeth of oil stop, pay attention not to break the copper teeth
1.2.10 pay attention to check and keep the oil drain hole (opening) of the inner oil stop unblocked
1.2.11 when using the blue lead wire to measure the tightening force of the oil gap, the blue lead wire placed on the top should not be too thick, so as to avoid the deformation of the bearing cover caused by the excessive tightening force of the bearing cover bolts, causing measurement errors, and there should be no pits and pockmarks at the position where the blue lead wire is placed. The minimum value should be taken when measuring the thickness of the lead wire
1.2.12 when the tightening force of the spherical shell is insufficient, the gasket can be pulled or brushed on the plane of the ball pillow, but the gasket cannot be added on the spherical surface
1.2.13 the plane gasket of bearing bush shall be consistent with the plane shape of bearing bush, and shall not touch the journal or block the annular oil chamber
1.2.14 before grinding and scraping the bearing pad, it is necessary to find out the front and rear position marks of the pad, the pit condition and the center condition, so as to avoid repeated reverse work
1.2.15 ring grinding and scraping operation, the amount of movement in the pit should be small, generally 15-20 mm. Use a sledgehammer to knock on the plane of the bearing bush. When moving, the aluminum plate should be padded to prevent roughening the plane of the bearing bush. At the beginning, try to make the left and right sides contact first, to avoid the bottom hard, so that the bearing sways left and right, causing false appearance. After the rotor is hoisted in, the bridge gauge value should be rechecked
1.2.16 the spherical surface should not be over polished on both sides to avoid scrapping e to loosening of both sides
1.2.17 when brushing the bearing plane, pay attention to the plane inclination and prevent the deviation
1.2.18 when the bearing is buckled, the coating on the joint surface should not be applied too much to avoid the agent entering the bearing chamber, and a side should not be applied near the inner side
1.2.19 it is forbidden to clean the bearing and bearing box with sand head
1.2.20 oil inlet
1.1.1 thrust bearing maintenance
1.1.1.1 disassembly of thrust bearing:
a oil cup intermediary on thrust bearing cover, remove thermometer, Remove the flat head fastening screw, screw out the cover, take out the transparent cover and outer cover, and finally screw out the oil cup
b pull out the vertical pin on the high pressure side of the thrust bearing cover and two locating pins on the split surface
C loosen the nuts on the horizontal joint surface and lift out the bearing cover
d remove the bolts on the horizontal joint surface of the inner cover of the thrust pad, lift the inner cover of the bearing evenly by about 30-40mm with the buttress screws, and then lift off the bearing cover
e loosen the bolts on the horizontal joint surface of the ball pillow, pull out the taper pin, lift the ball pillow with a special lifting ring, and remove the lead wire of the thrust pad thermometer
F loosen the pull-up spring of the oil retaining ring and take out the two half oil retaining rings (after modification, it is a floating ring oil retaining ring, which can be taken out by removing the flat screw)
G remove the plane bolts of the thrust pad mounting ring, take out the upper half of the thrust pad mounting ring in positive and negative directions, and then dig out the lower half of the thrust pad mounting ring in positive and negative directions
1.1.1.2 measure the clearance of thrust pad:
a when the thrust bearing is assembled, cover the outer cover of the thrust bearing, drive in the taper pin, and tighten the horizontal split bolt
b a dial indicator is installed on the thrust bearing shell, and the measuring rod is supported on the thrust ball pillow and parallel to the shaft to measure the axial movement of the pad pillow
C another dial indicator measuring rod is supported on a plane of the rotor and parallel to the axis. Use two jacks to turn the rotor back and forth to the front and rear limit positions, and read out the maximum and minimum indication values of the dial indicator. The difference of the rotor dial indicator is the total displacement, and the displacement minus the movement of the pad pillow is the clearance of the thrust pad, which can be solved by adjusting the axial adjusting ring gasket outside the pad pillow
1.1.1.3 check the thrust pad:
a check the black gold working face of the pad, measure the thickness of the pad and compare it with the original value. If it is abnormal, find out the cause and make necessary treatment
b check the swing line and pin on the back of the pad, and check the swing of each pad after the combination of the thrust pad
C check the temperature measuring elements and wires
d check the wedge-shaped oil inlet clearance of the thrust pad:
put a steel tape on the black gold surface of the pad, measure the oil clearance of the wedge-shaped outer opening with a feeler gauge, and observe whether the shape of the oil clearance meets the drawing requirements according to the contact marks on the black gold of the bearing
e check the contact condition on the flat plate after the combination of tile blocks
1.1.1.4 check the oil baffle ring and clearance
1.1.1.5 check and adjust the clearance of oil ring of oil return baffle (according to the adjustment method of oil baffle in bearing bush)
1.1.1.6 check the shell and accessories of thrust bearing
1.1.1.7 assemble in reverse order according to the disassembly procere. After assembly, retest the clearance of thrust pad and check whether the assembly is correct
1.1.2 check the insulation of generator rear bearing and exciter bearing pedestal. In order to prevent the electric corrosion of bearing bush caused by shaft current ring operation, install insulation layer (including bolt, insulating sleeve and gasket) between generator rear bearing, exciter bearing pedestal bottom and oil pipe flange:
1.1.2.1 measure the insulation resistance after the adjustment of turbine generator center
1.1.2.2 lift the generator rotor about 10 mm with crane
1.1.2.3 use insulating cloth or green paper with thickness of about 0.5mm to pad between the journal and the bearing bush, so that the shaft and the bearing bush are completely separated
1.1.2.4 use a 500V megger to measure the resistance of bearing pedestal to ground
1.1.2.5 if it is found that the resistance is less than the specified value, it should be decomposed step by step to find out the cause. Generally, the oil pipe can be removed first, and then the seat frame bolts can be loosened one by one until the bearing seat is lifted and the gasket is checked again
1.1.3 tighten the foundation foot bolts (for items that are not frequently repaired, the foot bolts of each bearing pedestal shall be inspected every overhaul, and the foot bolts shall be tightened once every overhaul or vibration of the unit)
1.2 quality standard
1.2.1 the surface of bearing alloy is smooth, without tire shedding, chipping, crack corrosion, overheating and abnormal wear
1.2.2 bearing clearance (mm)
oil clearance on both sides of the first bearing (￠ 300): 0.20-0.30
top oil clearance: 0.30-0.55
jacking oil clearance: 0.02-0.04
jacking oil area: 35 × 45
oil gap on both sides of the second bearing (￠ 325): 0.25-0.35
top oil gap: 0.45-0.60
jacking oil gap: 0.02-0.04
jacking oil area: 40 × 55
oil gap on both sides of the third bearing (￠ 325): 0.25-0.35
top oil gap: 0.45-0.60
jacking oil gap: 0.02-0.04
jacking oil area: 40 × 60
oil gap on both sides of the fourth bearing (￠ 300): 0.20-0.30
top oil gap: 0.30-0.55
jacking oil gap: 0.02-0.04
jacking oil area: 45 × 65
oil gap on both sides of the fifth bearing (￠ 160): 0.10-0.15
top oil gap: 0.15-0.25
jacking oil gap: 0.02-0.04
jacking oil area: 45 × 65
1.2.3 the contact between the journal and the lower bush is uniform, the contact angle is about 60 degrees, and the wedge clearance of 0.02mm between the two ends of the Bush and the journal is kept within the range of 5-10mm, so as to avoid causing axial vibration
1.2.4 oil baffle clearance mm
A: 0.30-0.5
b: 0.08-0.14
C: 0.1-0.32
D: 0.1-0.30 see figure "oil baffle clearance"
1.2.5 the inserted teeth are not loose, and there is no through groove or opening on the horizontal joint surface (0.05 feeler gauge cannot be inserted)
1.2.6 tightening force or clearance:
1.2.6.1 tightening force between pad pillow and spherical shell 0-0.02mm
1.2.6.2 tightening force between spherical shell and ball pillow 0-0.02mm
1.2.6.3 tightening force between ball pillow and bearing cover 0.10-0.15mm
(the above tightening force values are e values under running state, and the specific installation value should be appropriately corrected according to the internal and external temperature difference of each bearing; That is to say, the bearing with high shell temperature should increase the tightening force appropriately.)
1.2.7 the contact trace of each pad iron of tile sleeper shall account for more than 70% of the total area and be evenly distributed. There shall be no more than four gaskets in each pad iron of tile sleeper, and the thickness shall be uniform and flat without burr
1.2.8 after lifting the rotor, there are two shim feelers on the left and right of the ball pillow, which can be 0.05-0.07mm at the bottom
1.2.9 tile pillow: spherical shell, tile pillow joint surface contact is good, 0.03mm feeler gauge can not be inserted, red lead powder inspection contact area is not less than 75%, and contact is even
1.2.10 the oil inlet and outlet of bearing seat shall be unblocked and clean, and the oil chamber shall be clean and free of impurities
1.2.11 the joint surface of the seat cover is flat and smooth without through mark
1.2.12 the jacking oil pipe is clean and free from leakage
1.2.13 the black gold surface of the thrust pad is complete, without cracks, peeling off, tire shedding, wear, electric corrosion marks, overload whitening, overheating melting, or other mechanical damage, and the working marks of each pad are roughly uniform
1.2.14 the thickness of thrust pad is generally 1.50 ± The thickness of the pad is 0.10 mm, and there is no obvious wear compared with the original record. The wedge-shaped oil gap area of the pad meets the requirements of the drawing, and the inlet gap is 0.50 mm
1.2.15 the inner and outer arcs and pin holes of the pad tire have no wear marks, the swing support line has no obvious wear, and the pad can swing freely along the cycloidal line after assembly
1.2.16 thrust pad shaft seal clearance (mm)
A: 0.04-0.12
b: 0.04-0.12
b: 0.04-0.12 δ 1 (working face) 0.10
δ 2 (non working face) 0.50
1.1.1 the floating ring seal oil retaining ring on both sides of thrust pad is assembled correctly, and the pull spring is not seriously deformed. The upper half and the lower half of the thread slots are matched with each other. There is no peeling, crack or peeling in Wujin. After assembly, use a 0.03mm feeler gauge to check that there is no gap on the split
1.1.2 axial clearance of thrust pad is 0.04-0.06mm; The movement of tile pillow is ＜ 0.05mm
1.1.3 under the condition of full combination, the impression area of the thrust pad in contact with the thrust disc shall not be less than 75% (each pad is approximately equal and evenly contacted)
1.1.4 the matching between the locating pin and the hole on the joint surface of the thrust bearing shell shall not be loose or bent; the upper and lower halves of the shell shall not be dislocated
1.1.5 the opening of oil return regulating valve of thrust pad meets the requirements of normal oil return volume (the pad temperature is normal ring operation)
1.1.6 after assembly, there is no garbage in the thrust pad
1.1.7 after assembling, the tension spring of thrust bearing oil baffle ring should be lengthened by 58-65mm to ensure that the upper and lower split surfaces of oil baffle ring are closed
1.1.8 the insulating plate at the bottom of the bearing pedestal shall be clean and free of oil dirt (it is better to use two layers of insulating plates and stack them alternately with steel gaskets in a tower shape, and the insulating gaskets shall be cleaned and dried with gasoline or acetone). After combination, the insulation value is greater than 1 megohm
1.2 precautions
1.2.1 when lifting out the bearing cover or ball pillow, pay attention to check whether there are gaskets on the plane or top of the spherical shell. If there are gaskets, measure the thickness, make records and keep them properly
1.2.2 before the first bearing is lifted out, the speed regulating part cover should be lifted first
1.2.3 when lifting the low pressure rear bearing cover, remove the vertical bolts on the upper half of the outer oil stop of the low pressure bearing first, and then take out the oil stop after lifting out the bearing cover
1.2.4 for cylindrical and oval bearing bush, the tightening force of Bush Bush should be adjusted before pressing oil clearance
1.2.5 when the oil gap is measured by pressing the blue lead wire, the position of the blue lead wire should avoid the oil return groove on the top of the upper tile
1.2.6 if the oil gap of bearing bush is not correct, it should not be handled blindly. It should be handled according to previous records and after finding out the cause
1.2.7 at present, the bridge gauge is not supplied by the manufacturer. Each manufacturer should make the bridge gauge by itself and mark the unit number and bearing number on the bridge gauge. During the measurement, place the feeler gauge stably according to the marked position, use no more than three feeler gauges, press the feeler gauge tightly on the journal and move it gently in the clearance, which shall be subject to the condition that the feeler gauge just touches the flange of the bridge gauge and can pass through the clearance
1.2.8 when the outer oil stop and the bearing seat are fastened with bolts, the screw hole shall not be connected with the oil chamber to avoid oil leakage from the thread. When the upper and lower clearance of the oil stop is adjusted by scraping the plane, too much scraping shall not be done to avoid too large file of the fixing screw hole and oil leakage from the screw hole
1.2.9 when twisting the copper teeth of oil stop, pay attention not to break the copper teeth
1.2.10 pay attention to check and keep the oil drain hole (opening) of the inner oil stop unblocked
1.2.11 when using the blue lead wire to measure the tightening force of the oil gap, the blue lead wire placed on the top should not be too thick, so as to avoid the deformation of the bearing cover caused by the excessive tightening force of the bearing cover bolts, causing measurement errors, and there should be no pits and pockmarks at the position where the blue lead wire is placed. The minimum value should be taken when measuring the thickness of the lead wire
1.2.12 when the tightening force of the spherical shell is insufficient, the gasket can be pulled or brushed on the plane of the ball pillow, but the gasket cannot be added on the spherical surface
1.2.13 the plane gasket of bearing bush shall be consistent with the plane shape of bearing bush, and shall not touch the journal or block the annular oil chamber
1.2.14 before grinding and scraping the bearing pad, it is necessary to find out the front and rear position marks of the pad, the pit condition and the center condition, so as to avoid repeated reverse work
1.2.15 ring grinding and scraping operation, the amount of movement in the pit should be small, generally 15-20 mm. Use a sledgehammer to knock on the plane of the bearing bush. When moving, the aluminum plate should be padded to prevent roughening the plane of the bearing bush. At the beginning, try to make the left and right sides contact first, to avoid the bottom hard, so that the bearing sways left and right, causing false appearance. After the rotor is hoisted in, the bridge gauge value should be rechecked
1.2.16 the spherical surface should not be over polished on both sides to avoid scrapping e to loosening of both sides
1.2.17 when brushing the bearing plane, pay attention to the plane inclination and prevent the deviation
1.2.18 when the bearing is buckled, the coating on the joint surface should not be applied too much to avoid the agent entering the bearing chamber, and a side should not be applied near the inner side
1.2.19 it is forbidden to clean the bearing and bearing box with sand head
1.2.20 oil inlet
9.
The number of steam turbine tile is from the head direction to the exhaust cylinder direction, that is, the flow direction of main steam. Bearing is also commonly known as tile
The thrust bearing is generally composed of two or more thrust gaskets and a number of rolling elements. Generally, the thrust gasket is divided into shaft plate and seat plate, and the most common type of rolling element is composed of iron or copper cage. The most common type of bearing is steel ball thrust bearing 
extended data:
thrust ball bearing is a separate type of bearing, the shaft ring and race can be separated from cage and ball components. The shaft ring is a ring matched with the shaft, and the seat ring is a ring matched with the bearing seat hole, and there is a gap between the shaft and the shaft
Thrust ball bearing can only bear axial load, one-way thrust ball bearing can only bear axial load in one direction, and two-way thrust ball bearing can bear axial load in two directions; The thrust ball bearing can not limit the radial displacement of the shaft, the limit speed is very low, the one-way thrust ball bearing can limit the axial displacement of the shaft and the shell in one direction, and the two-way bearing can limit the axial displacement in two directions. The thrust roller bearing is used to bear the axial and radial combined load, but the radial load shall not exceed 55% of the axial loadHot content