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BY型轴流通风机是矿山通风系统的主机,传动系统中用3米以上的传动轴将电机和主机联接起来,联轴器选用两副齿轮联轴器,联轴器中间还加装一套双列调心滚柱轴承以保证两轴之间的同心度。按该设备使用说明书规定的技术要求安装以后,多次发现齿轮联轴器很快磨损,其使用寿命仅有数月,而该产品使用说明书中所规定的安装要求(联轴器不同心度≤0.1mm,两轴倾斜误差≤0.5/1000)已远远高于《机械设备安装工程施工及验收规范》的精度要求,但为什么还不能满足实际使用的要求呢? 如果没有误差,在纯理想状态下,该齿轮联轴器内外齿之间不会有相对运动,也不会造成磨损。造成联轴器磨损的根本原因显然就是因安装误差引起的振动,使内外齿轮的齿面间产生相对运动,从而发生磨损现象,而在电机轴与风机主轴之间再增加一根浮动的传动轴,则传动轴本身的振动又加剧了整个系统的振动,从而导致两对联轴器迅速磨损。 计算表明,在系统质量、刚度、阻尼情况相同的条件下,符合说明书要求安装的、加传动轴的齿轮联轴器,其径向跳动是没有传动轴的、按一般精度安装的齿轮联轴器的径向跳动的2.84倍。
BY-type axial fan is the host of the mine ventilation system, the drive system with 3 meters above the drive shaft to the motor and the host link, the coupling selection of two gear couplings, the coupling also installed a middle Double row self-aligning roller bearings to ensure concentricity between the two axes. According to the technical requirements stipulated in the instruction manual of this equipment, after installation, it is found that the gear coupling wear out quickly and its service life is only a few months, and the installation requirements specified in the instruction manual of the product (coupling with different concentricity ≤0.1 mm, two-axis tilt error ≤0.5 / 1000) has been far higher than the precision requirements of the “Code for Construction and Acceptance of Mechanical Equipment Installation Project”, but why can not meet the actual requirements? If there is no error, under purely ideal conditions , There will be no relative movement between the internal gear and the external gear of the gear coupling and no wear will be caused. The root cause of the coupling wear is apparently due to the vibration caused by the installation error, so that the relative movement between the internal and external gear tooth surface, resulting in wear and tear, while the motor shaft and the fan shaft and then add a floating drive shaft , The vibration of the transmission shaft itself aggravates the vibration of the entire system, resulting in rapid wear of the two pairs of couplings. The calculation shows that, under the same conditions of system quality, stiffness and damping, the gear coupling with drive shaft fitted in accordance with the instruction manual has the radial runout without gear shaft and the gear coupling installed according to general accuracy 2.84 times the radial runout.