How to Avoid Damage to the Output Shaft of the WPDS70-60 Worm Gearbox Caused by Excessive Temperature
1、 Optimization of lubrication system (reducing shaft friction heat source from the source)
Accurate selection of oil products: Abandon ordinary mineral oil and choose L-CKE 220 # worm gear special extreme pressure oil. Upgrade to PAO fully synthetic gear oil for high-temperature continuous working conditions. Its antioxidant capacity is 2-3 times that of mineral oil, and it can still maintain a stable oil film at high temperatures.
Strict oil level control: The oil level is controlled at the centerline of the oil window, preferably low rather than high, to avoid excessive oil level causing increased oil mixing loss and additional heat generation; Low oil level can lead to insufficient lubrication of the mating surface and output shaft bearings, exacerbating friction and heat generation.
Full cycle management of oil: Under high temperature conditions, the oil change cycle has been shortened from the usual 12 months to 4-6 months. Oil quality is sampled and tested every 3 months. If the acid value increases by more than 0.5mgKOH/g or metal debris appears, the oil should be changed immediately to avoid impurity wear on the output shaft neck.
2、 Upgrade of cooling system (quickly remove accumulated heat near the output shaft)
Passive heat dissipation enhancement: Clean the dust and oil stains on the surface of the box's heat dissipation ribs and output shaft bearing seat with compressed air under 0.6MPa every week to avoid the formation of insulation layers that hinder heat dissipation; Aluminum alloy heat dissipation fins can be installed on the outside of the box to increase the heat transfer area.
Forced air cooling adaptation: Install an independent cooling fan next to the bearing seat at the output shaft end, with an air volume of ≥ 80m ³/h, and align the air outlet with the bearing part to directly remove the heat from the shaft system; Choose a fan driven by an external motor under low-speed conditions to avoid insufficient heat dissipation efficiency of the fan rotating with the input shaft at low speeds.
Extreme working condition water cooling assistance: When the ambient temperature exceeds 60 ℃ for a long time, a small water cooling sleeve can be installed outside the output shaft bearing seat, and industrial circulating water with a temperature of ≤ 30 ℃ can be introduced at a water flow rate of ≥ 0.5m/s to quickly dissipate the heat of the shaft system. Pay attention to regularly cleaning the scale inside the water cooling sleeve.
3、 High temperature adaptation of output shaft and supporting components
Sealing upgrade: Replace the ordinary nitrile rubber skeleton oil seal at the output shaft end with fluororubber or polytetrafluoroethylene (PTFE) material, and increase the temperature resistance limit from 120 ℃ to over 200 ℃ to avoid oil leakage caused by seal hardening and cracking at high temperatures, and prevent dry friction of the output shaft bearing after lubricating oil leakage.
Bearing lubrication optimization: Replace ordinary lithium based grease with polyurea based high-temperature grease with a drip point ≥ 260 ℃ for the output shaft bearing. The long-term use temperature can reach 180 ℃ to avoid grease loss and bearing sintering under high temperature, and to prevent relative sliding between the output shaft and the inner ring of the bearing due to "running circles".
Axis alignment verification: Regularly verify the coaxiality between the output shaft and the load shaft, with a radial deviation of ≤ 0.05mm and an angular deviation of ≤ 0.1 °, to avoid additional frictional heat and high temperature caused by misalignment, which may lead to local overheating and deformation of the output shaft.
