Large jaw crusher main bearing replacement repair process

Generally large jaw crusher main bearing mostly used off sliding bearings, bearing lined mostly by Babbit made this bearing scraping the higher technical requirements, poor or

scraping gap adjustment improperly Research watts or Burnt accidents. 1 Remove the old tile banana screen should

Do the work
 (1) bearing joints old tile measurement port shim thickness.
 (2) measuring spindle levelness.
 (3) Carefully check whether the spindle is smooth, whether there is rust, bumps and other defects, if any, should try to eliminate.
 (4) bearing the old tip clearance measurement, and the axial clearance backlash.
2 detection jaw crusher tile back case and bearing contact
  According to "JB/T5000.10-1998 heavy machinery assembly general technical conditions" requirements, it must be good scraping tile back to reach the technical requirements.

Otherwise, the equipment operation between the bearing and the bearing prone reverse slip or turn. To prevent this from happening,

Generally using pin and sleeve positioned.

3 bearing scraping the technical requirements
  According to heavy machinery assembly general technical conditions" in the requirements, the spindle scraping should meet the following technical standards.
(1) both the spindle and bearing uniform fine touch, but also with a certain gap, so that the upper and lower contact angle with the spindle bearing portion is formed outside

the oil wedge and the wedge from tile mouth began a gradual transition from maximum to zero.
(2) the contact angle is not too large nor too small. The contact angle is too small, the pressure pad will increase, serious cause greater deformation pad, accelerated wear,

shorten the service life; contact angle is too large, it will affect the film formation, damage to the lubricating effect. Therefore, without affecting the bearing

The conditions set pressure, the contact angle the sand vibrating screen smaller the better.
(3) within the scope of the contact angle the more actual contact spots, more detailed, the more uniform the better.
4 main bearing scraping
  Scraping shaft bearing should be the basis, both on the research carried out after the use of bore scraper scraping. Scraping the beginning of the procedure is to first

scraped tiles, tile and then scraping the beginning, and then fine scraping the entire tile, scraping the side of the gap, and the last point of the oil. Bush can generally be

divided into rough scraping scraping. Scraping and scraping three fine finishing process.

Scraping should be used to take the first re-light, scraping heavy to stay light, scratch big to stay small principle. In scraping bush, not only the contact point, the contact

angle meet the technical requirements, but also to make the top. Side clearance to achieve the specified value.
(A) the upper and lower watt coarse and fine scraping
First, the two under the tile installed in the bearing, and then coated on the spindle display agents (such as red lead powder, red Qian oil), mounted on the spindle bearings,

two or three times to the positive and negative direction of rotation, Then remove the spindle, according to the bearing points on the distribution of colored rough scraping.

Rough scraping order

Segment can be positive rake angle scraping. Hand can head a few times heavier, multi-scrape some metal in order to accelerate the progress of scraping. When the contact area of

​​50%. These fine scraping. In the fine stage can be a small rake angle scraping scraping knives and bearing centerline trace should be a 45 ° angle, scraping can not use

excessive force

, To prevent the knife traces generated ripples. Scraping knife to trace around the cross, until the contact angle of contact spots within the uniform clouds, horizontal spindle

error in 0.2mm / m far between. On tile thickness scraping methods and requirements under the tile of coarse and fine scraping method requires basically the same. Do not

Is put on the same tile on the research carried out on the top of the spindle.
(2) the upper and lower watt fine scraping
Upper and lower watts through thick and thin scraping, the contact spot is still large, the need for further refinements. First, the upper and lower joints by adding tile tile

mouth gasket, the spindle, the tile locating pin installed, tighten the screws, so that the direction of rotation of the spindle in the normal running laps, and then removed the

tile

, Hanging spindle go for lapping work. Scraping, it is best to use negative rake angle scraping until the contact surface of the contact pattern meets the technical requirements

so far
(3) side clearance and keep scraping oil spots
After finishing scraping, scraping side clearance and should be kept oil spots. Scraping side of the gap, the ends should be set aside as part of the sides to prevent the

outflow of oil from the tile, thus ensuring the bearing lubrication. In the tile contact portion between the contact portion and not to be rendered gradual transition; not have

clear boundaries. Then

In the bearing contact point arc scraping of the oil, the oil remaining in point is used to store oil. Save oil spots can be round or flat, depth is generally 0.3 ~ 0.5mm, an

area of ​​15 ~ 30mm2, the total area should not exceed scraping of the oil on the contact point of the arc, save points are used to store oil lubricants. Deposit

Oil spots can be round or flat, depth is generally 0.3 ~ 0.5mm, an area of ​​15 ~ 30mm2, the contact area of ​​the arc should not exceed 1/5.
5 bearing clearance measurement and adjustment methods
  Oil wedge bearing clearance determined thickness, and affect the operation of the spindle accuracy. Excessive bearing clearance caused by equipment vibration, reduce equipment

life; bearing gap is too small will result in Burnt. Therefore, a reasonable conditioning bearing clearance is an important issue that must to reach the required standards
(1) Adjustment of tip clearance measurement method C
Can change the height of the top bearing clearance at the tile joints to adjust the thickness of the spacer opening. The fewer the number pad, the pad compaction better

equipment running more smoothly, so to ensure the case does not appear Burnt, gaskets better. Tip clearance measurement methods commonly used pressure to lead France

Measurements.
(2) side clearance adjustment and measurement methods
And the journal bearing gap between the side, which is usually measured using feeler gauge. When measuring feeler inserted into the gap in the length of the major axis diameter

of not less than 1/4 of a side bearing joints equal gap should be uniform.
(3) axial clearance measurement method
Bearing axial clearance is generally measured with a feeler.
  After years of practice, we believe that the top bearing shaft clearance should be 0.15% to 0.2%, the backlash should headspace of 60% to 100%, the axial clearance should be 1

~ 3mm for the best.
6 assembly and commissioning
  When assembling, we must first bearing, journal, and lubricant oil collector piping clean. Then the main bearing, connecting rod, etc. assembled. Install belt should make it a

little higher than normal operation loose a little. Test, first start pumps, oil and make a little when compared with the normal operation

Larger. If the testing process does not appear significantly increased and the current oil temperature significantly increased the phenomenon, it shows successful repair, the

equipment can be put into normal use.