In order to enable the iron to hold the journal, the length of the iron is 25mm smaller than the circumference of the journal (we take the length of the iron is 370mm); in order to avoid the influence of the iron on the lock nut, the width of the iron is smaller than the width of the bearing. 13mm, the width of the bearing is 58mm (we take the width of the iron is 56mm); in order to facilitate the installation of the bearing, the four corners of the iron should not have a right angle, we made a rounded transition of R of 5mm. The iron sheet is required to be flat, and the shearing edges of the four sides of the iron sheet are corrected by the grinding wheel or the flat plate to eliminate the edge. Finally, roll the iron sheet into an open circle. The joints of the circle must be aligned and not skewed.
Applying the adhesive We use a good adhesive to bond the journal and the iron. Firstly, the two components of the adhesive, A and B, are poured into a clean glass plate according to the aliquot of 1B1, and then evenly spread on the worn journal surface with clean cardboard; then, the iron sheet is quickly applied. The snare is placed on the journal, and the end face of the iron ring is next to the bushing and parallel to the end face of the main shaft; finally, the iron ring is tied with a thin wire to be rolled. After correcting the journal for 30 minutes after the metal ring is bonded (the adhesive reaches the maximum strength for 30 minutes), loosen and remove the fine wire rolled on the iron ring, place the bearing on the locking thread of the spindle, and loosen the manual hoist. Lower the spindle and place the bearing in the lower bearing housing, letting the shaft bear the spindle. Fix the magnetic dial indicator on the upper end surface of the bearing chamber, slowly rotate the spindle by hand, measure the radial deviation of the journal with a dial gauge, and measure the diameter of the journal with a micrometer. Finally, according to the data measured by the dial gauge and the micrometer, the journal is corrected by the flat plate, and then corrected and then corrected. This is repeated several times until the diameter of the journal reaches a range of <120 mm (0.050.10) mm, and its radial deviation is controlled within 0.05 mm.
The cleaning and inspection use the manual hoist to lift the spindle slightly and remove the bearing. Since a large amount of iron filings are generated during the correction of the journal, the components such as the main shaft, the bearing chamber and the bearing must be cleaned and inspected again, the iron filings and debris are cleaned, and the shaft is cleaned with acetone. . Installation According to the inspection, if there are defects such as pitting, cracks, etc. on the raceway and the roller (or the clearance is too large), the bearing needs to be replaced.
After heating the bearing to 100e by water bath and keeping it for 2h, quickly install the bearing on the journal; tighten the lock nut, lock the lock piece after there is no residual gap between the lock nut and the bearing; check the bearing chamber With the clearance of the bearing, install the upper cover of the bearing chamber, install the opposite wheel, and the pair of wheel pins and tighten the bolts. After trial operation, after the components are installed, add lubrication to the bearing chamber and conduct a comprehensive inspection of the fan. Start the test run without any problems. During the test run, pay attention to the vibration, temperature and sound of the bearing, as well as the condition of the motor and fan. After using the effect of the two brothers to adhere to the iron field emergency repair of the fan spindle, the fan has been safely running for several months, the technical situation is stable. The method is simple in process, convenient in operation, and can be operated on site. Basically, no special maintenance equipment is needed, which solves the problem of serious on-site emergency repair of the large-scale fan spindle journal of our factory, and ensures the normal operation of the production. This method is also suitable for on-site emergency repair of severe wear of journals in other mechanical transmission systems.
The bolt break is exposed outside the wire hole and is tested and removed using a pipe wrench. Pull out the exposed part of the bolt out of the square or two, and turn it off with a wrench. A nut is welded to the section to rotate the trial and disassembly. The bolt break is located in the wire hole. If the diameter of the broken wire is small, the electrode with the appropriate thickness can be selected, so that the electrode itself is welded to the screw section, the exposed part of the electrode is bent, and the electrode is tested and demolished. It is also possible to weld a thin long rod bolt to the section and turn the bolt to the six sides for trial release. If the diameter of the broken wire is large, in addition to the method 2, a hole can be drilled first in the section, and a suitable inner hexagonal wrench is selected to be driven into the hole for rotation and trial (or after the drilling, the reverse thread is tapped, Screw on the back screw and try to remove it). The above three methods are most effective for the long-term oil-infiltrated broken wire. Otherwise, an appropriate amount of screw loosening agent is added to the thread of the broken wire in advance, and it is slightly removed after 1 hour, and the probability of successful disassembly is greater. If the screw hole of the broken wire is not allowed to be enlarged, a drill bit smaller than the diameter of the thread of 0.51 mm can be selected, and the broken bolt can be drilled and the required thread can be tapped. If the screw hole of the broken wire is allowed to be enlarged, the broken wire can be completely drilled by the drill bit, the hole can be re-expanded, and the enlarged standard thread can be attacked.
Stainless steel nuts are components that tightly connect mechanical equipment, and can only be connected by screws on the inside, nuts and screws of the same specification. For example, M4-0.7 nuts can only be combined with M4-0.7 screws. (In the nut, M4 means the inner diameter of the nut is about 4mm, and 0.7 means the distance between the two threads is 0.7mm. );
The same is true for products made in the United States. For example, a 1/4-20 nut can only be combined with a 1/4-20 screw. (A 1/4 finger nut has an inner diameter of about 0.25" and 20 fingers have 20 teeth per inch. Features of Stainless Steel Round Nuts
Stainless steel nuts have the advantages of not easy to rust, anti-corrosion, thermal conductivity, and strong electrical conductivity. Another major use is injection, where it is embedded in plastic parts after heating, or injected directly from a mold.
Although many people may have used this stainless steel round nut, they do not really realize the importance and advantages of this nut. According to the introduction of the article, you should be able to understand what kind of characteristics this nut has. When a nut needs to be used in the future, it should be considered that such a nut plays a more important role.
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