Worm gear reducer is a kind of transmission machinery with compact structure, large transmission ratio, and under certain conditions with self-locking function, is one of the most commonly used reducer, among which, hollow shaft type worm gear reducer not only has the characteristics of the above, but also convenient installation, reasonable structure, more and more widely used. Hollow shaft type worm gear reducer is equipped with a helical gear reducer at the input end of worm gear reducer, which can obtain very low output speed. It is the combination of helical gear and worm gear, and has higher efficiency than pure single-stage worm gear reducer. And small vibration, low noise, low energy consumption. Faqs and their causes. 1) Reducer heating and oil leakage, (2) worm gear wear, (3) transmission helical gear wear, (4) bearing (worm) damage. background-color: rgb(255, 255, 255);" >1. Reducer heating and oil leakage. Worm reducer in order to improve the efficiency, generally adopt nonferrous metal worm gear, worm, the use of the hard steel, because it is sliding friction transmission, in the process of operation, can produce high quantity of heat, make the reducer thermal expansion differences between the parts and seal clearance to the mating surface, and the oil due to the rise of temperature is thinning, easy to cause leakage. There are four main reasons, one is the material collocation is reasonable, the other is the surface quality of the meshing friction surface, the third is the choice of lubricating oil, adding quantity is correct, the fourth is the assembly quality and use environment.
2, worm gear wear. The worm gear is generally made of tin bronze, and the matched worm material is generally hardened to HRC45-55 with 45 steel, and also commonly used 40C: hardened HRC50-55, which is grinded to rao.8 FCM by the worm grinder. When the reducer is in normal operation, the worm is like a hardened "file", which constantly files the worm gear and causes the worm gear to wear. Generally speaking, this kind of wear is very slow, as some factories can be used for more than 10 years. If the wear speed is faster, it is necessary to consider whether the selection of reducer is correct, whether there is overload operation, worm gear and worm material, assembly quality or use of the environment and other reasons.
3, drive small helical gear wear. Generally occurs in the vertical installation of the reducer, mainly with the amount of lubricating oil and the choice of lubricating oil. Vertical installation, it is easy to cause insufficient lubricating oil, when the reducer stops running, motor and reducer transmission gear oil loss, gear can not get due lubrication protection, starting or running process can not get effective lubrication leading to mechanical wear and even damage.
4, worm bearing damage. When the reducer fails, even if the reducer is well sealed, the factory often finds that the gear oil in the reducer has been emulsified, and the bearing has been rusted, corroded and damaged. This is because the reducer is in the process of operation and stop, and the gear oil is caused by the moisture condensation generated after the heat becomes cold. Of course, it is also closely related to bearing quality and assembly process methods.
Solutions. (1) Ensure assembly quality. In order to ensure the assembly quality, the factory bought and made some special tools, disassembly and installation of reducer worm gear, worm, bearing, gear and other parts, as far as possible to avoid using hammers and other tools directly percussion; When replacing gears and worm gear, try to choose original accessories and replace them in pairs; When assembling the output shaft, pay attention to the tolerance coordination, D≤50mm, H7/ K6, D > 50mm, H7/ M6, at the same time to use anti-stick agent or red lead oil, protect the hollow shaft, prevent wear and rust, prevent the coordination area scale, difficult to disassemble during maintenance.
(2) selection of lubricating oil and additives. 220 # is generally selected worm gear reducer gear oil, on some of the heavier load, frequent restart, use environment poor speed reducer, the factory also chose some lubricating oil additives (such as cure chemical company can be better), speed reducer, when stop, gear oil is still attached to the surface of gear, form protective membrane to prevent heavy load, low speed, High torque and metal-to-metal contact at startup. The additive also contains sealing ring regulator and anti-leakage agent to keep the sealing ring soft and elastic, effectively reducing lubricating oil leakage.
(3) Selection of installation position of reducer. If the position allows, try not to use vertical installation. When vertical installation, the amount of lubricating oil added is much more than that of horizontal installation, which is easy to cause heat and oil leakage of reducer. Some of the 40000 bottles/hour draft beer production lines introduced by the factory are installed vertically. After running for a period of time, the transmission pinion is worn or even damaged. After adjustment, the situation has been greatly improved.
(4) Establish corresponding lubrication maintenance system. The factory according to the lubrication work "five set" principle, to maintenance of reducer, to every a deceleration machine has be periodic inspection, when the work is found in a significant rise in the oil temperature, temperature rise of more than 40 ℃ or oil temperature over 80 ℃, the quality of the oil drop or found in the oil more copper powder and the phenomenon such as abnormal noise, to immediately stop using the timely maintenance, troubleshooting, Replace the lubricating oil before use. When refueling, pay attention to the oil quantity and installation position should be consistent, to ensure that the reducer gets the correct lubrication.
In short, hollow shaft worm reducer is easy to install, reasonable structure, reliable and durable. Of course, also should pay attention to the choice of reducer brand, the strength of the company will be based on the shape of the reducer, the layout of the heat dissipation bar, the calculation of heat balance, oil design and other design points, combined with the actual use and operation conditions of the reducer, the use of good manufacturing process, the production of high quality, reliable and durable reducer. Users as long as the correct use of maintenance, you can get satisfactory results.