Anyone who does equipment maintenance knows that once there is a problem with the gearbox bearing chamber, vibration and noise will occur. In serious cases, the machine will be shut down and production will be stopped, causing considerable losses. Many colleagues relapse not long after completing the practice. In fact, they did not find the right method and stepped into the pitfalls of details. Today, I will share a set of streamlined and implementable maintenance methods based on front-line practical operations. Novices can quickly get started, and the whole process is practical and hassle-free!
When repairing the gearbox bearing chamber, the core premise is to determine the fault first – don’t dismantle it blindly! Common faults are mainly wear (accounting for more than 80%), deformation, and cracks. The main 3 causes are: ① Poor lubrication, direct friction between the bearing and the bearing chamber; ② Installation misalignment, resulting in eccentric bearing wear; ③ Poor selection of repair materials or improper application, and the repair layer is easy to fall off.
Master the core logic of "clean first, then process, then assemble", 4 steps to complete the repair, don't be lazy at every step!
Step one: Troubleshooting + preliminary preparation. Shut down the machine and cut off the power supply for protection. After disassembly, use a dial indicator and a knife-edge ruler to measure the wear depth: single-sided wear 0.2-0.3mm can be repaired online (without dismantling the whole machine); if it exceeds 0.5mm or there are cracks, repair welding first and then repair. At the same time, thoroughly clean the surface oil stains, old materials and rust. If the oil stains are not removed, the subsequent repair layer will fall off!
Step Two: Surface Preparation (Invisible Key!). Many people ignore this step, which leads to maintenance failure: first use oxygen acetylene to remove oil stains until carbonization, wipe it clean, use a spur wheel to polish to remove the oxidation layer, cut grooves on the edges to enhance the material bite, and finally use a new grinding disc to polish to a suitable roughness, and then wipe it clean with absolute ethanol. Remember to preheat the substrate in low-temperature environments to avoid incomplete curing of the material.
Step 3: Material blending + application. Give priority to carbon nanopolymer materials with strong adhesion and wear resistance (such as SD7101H, which is commonly used in practical operations), and mix them in proportion until there are no bubbles and no color difference; press the air evenly when applying to prevent cracking in the later stage, and then use a knife-edge ruler to scrape and smooth it to meet the bearing installation requirements.
Step 4: Curing + Assembly. 20 Cure naturally at about ℃, and can be accelerated by heating with an iodine tungsten lamp at low temperatures. After solidification, clean the excess material from the oil groove and the card groove. Lubricate the bearings first during assembly, then reassemble slowly (violent knocking is prohibited). After reassembly, use a dial indicator to measure the coaxiality. Poor alignment can easily cause wear again!
Finally, 3 tips for avoiding pitfalls, remember to avoid detours: ① Do not over-lubricate and do not mix different brands of grease; ② Do not violently knock the bearing to avoid damage to the raceway; ③ Regularly monitor vibration and temperature in the later period, replace grease in time, clean oil stains, and prevent failures in advance.
In fact, it is not difficult to repair the gearbox bearing room. The key lies in "precise inspection, standardized operation, and detailed control." Mastering the above methods can not only quickly solve the fault, but also reduce the recurrence rate and help the company reduce downtime losses. Store it and use it directly during maintenance!
(Source: Thorley Industrial Equipment)