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Bolts are unevenly loaded, and bolts with large loads are prone to breakage. 53.5@10m Unloading and drying around the bolt hole on the back of the end cap of the raw material grinding cylinder. There is no stopping device during the manufacture. When the bolt is tightened, the bolt/shaft is not tightened and the bolt is unevenly loaded. In the installation and maintenance, the torque wrench is not used as required. The bolts are tightened and a certain tightening torque is achieved. Instead, the self-made soil wrench is used to lengthen the steel pipe. Several people simultaneously tighten and control the tightening torque. Based on feelings and experience. There is no guarantee that the tightening torque of the bolt will be even and tight, which will not guarantee the even force of the bolt. At the same time, after the mill belt is running for a certain period of time, it can be tightened several times to meet the requirements. However, so far, normative installation and maintenance have not attracted much attention.
Stress concentration is a common cause of bolt breakage. Stress concentration is common in broken bolts. Mainly manifested in: 1 When machining bolts, the rounded corner R of the bolt root is too small, even without rounded corners R, resulting in stress concentration; o when turning the thread, the feed is unreasonable, the root of the thread protrudes sharply, resulting in stress concentration; When the bolt is reamed, hammering is required. If the hammering point is not correct, the bolt head is deflected, causing the one side to be stressed, and the stress concentration at the root of the bolt is intensified. When the bolt hole is machined, the chamfering is not performed, the bolt is The hole protrudes at the corner of the back surface of the end cover, which aggravates the stress concentration at the root of the bolt, and the defects of the processing method and method of the hinged bolt hole sometimes make the axis of the hinge hole and the end surface of the end cover not perpendicular, thereby causing the bolt head to be unilaterally stressed. Increase the stress concentration at the root of the bolt. In the above aspects, the stress concentration of the bolt is generated or aggravated, resulting in bolt breakage.
The hardness of the bolt after heat treatment is insufficient, causing the bolt to break. The material of these bolts is generally 40Cr. After the quenching and tempering treatment, the hardness reaches HB277302.53.2@7+1.8m. The surface of the broken bolt of the grinding and drying raw material mill has obvious crushing marks, indicating that the broken bolts are quenched and tempered. The hardness of the bolt did not meet the requirements, and the bolt was subjected to a strong alternating load, which was destroyed by plastic fatigue.
Treatment measures (1) Adjust the deviation of the center line between the mill and the main. The deviation between the center line of the mill and the main reducer is within the allowable range, preventing the mill from vibrating during operation and making it run smoothly. (2) Re-trimming and reaming the bolt holes. And ensure that the axis of the hinged bolt hole is consistent with the axis of the end cap of the mill to prevent the single side of the bolt head from being stressed and reduce stress concentration. (3) Replace the new bolt. Choose high-tech, reputable manufacturers to process new bolts, choose 40Cr material, bold hinge bolt diameter, increase the original 558mm to 558.5mm, strict processing technology and quality requirements, emphasize the quenching and tempering treatment, reduce the root of the bolt and The stress concentration at the root of the thread is standardized, and the hinged bolt holes are measured one by one to prepare corresponding hinge bolts to prevent unilateral stress and reduce stress concentration.
Correctly tighten and lock the nut in the 53.5@10m. Unload and seal the bolt hole around the bolt hole on the back of the raw material grinding end cover to prevent the bolt from tightening when tightening the bolt. Since there is no torque wrench, the length of the lengthened steel pipe of the self-made wrench, the force and operation method are strictly regulated. After the back nut and the lock nut of the double nut locking device are tightened, the lock nut is slightly loosened to ensure the locking effect of the nut, and after the grinding machine is running for 8 hours, tighten again until it is tight. Until the torque is constant, the bolts are kept in a good tight state, preventing the bolts from loosening and breaking, and ensuring the bolts work normally.
functions,shower and massge
water pressure,0.03-0.75Mpa
thickness of chrome plating,0.25-0.45um
thickness of nickel brush, 7.5-9.5um
warranty, 5 years
package: can be color box. 100 pcs/ctn,
each piece have single inner box
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