Safety Precautions For Vibratory Finishing Machine
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Vibrating screen is a common equipment in mining machinery and equipment. The vibration is mainly generated by the exciter. The vibrator is in poor working condition and with strong vibration shock, so it will be damaged over time. So today the Vibratory Finishing Machine manufacturer will share the faults caused by the vibrating screen design.
1. Bearing selection is not reasonable
The bearing type, the limit speed, the installation fit size, the clearance, the self-lubricating performance, etc. are relatively high, and the ordinary bearing is easy to be damaged under the severe working conditions. If the bearing is not properly selected at the beginning of the design, the bearing life will be shorter.
Solution: Use special bearings. Commonly used vibrating screen bearings generally have cylindrical roller bearings and spherical roller bearings. Both have large radial bearing capacity, the former is subject to higher limit speed, and has strong bearing capacity for dynamic and static loads, but has higher requirements on coaxiality of bearing housing holes; the latter has good self-aligning performance and can compensate Different shaft problems due to machining of the housing bore, but cannot withstand pure axial loads.
2. Lubrication and sealing structure design is unreasonable
At present, many vibration exciter bearings in China use grease lubrication and labyrinth seal structure, and the sealing gap is generally 1~2mm. However, in actual use, as the temperature of the exciter bearing increases, the viscosity of the grease gradually decreases, the spindle rotates at a high speed, and the grease in the labyrinth cover leaks continuously from the labyrinth cover, eventually causing the bearing to be damaged due to lack of lubrication.
Due to the unreasonable design of the lubrication seal structure, the bearing lubrication is not sufficient, which is the main reason for the deformation of the bearing due to heat and burning.
Solution: Use thin oil lubrication to improve lubrication channels and improve sealing structure. Many manufacturers currently use thin oil circulation lubrication, and the structure of the labyrinth seal combined with other non-contact seals.
3. The bearing and the bearing housing hole are not properly selected.
The tolerance between the bearing and the housing bore is the focus of the design. If a large interference fit is selected, the shape of the bearing race will be forced to deform geometrically and abnormally vibrate during operation. If a large clearance fit is selected, the outer ring of the bearing will slide relative to the bearing housing bore, causing the bearing to heat up and damage. .
Solution: Choose a reasonable fit tolerance. The bearing inner ring and the shaft are matched with a loose transition fit or clearance fit tolerance, and the outer ring and the bearing housing bore adopt a tighter transition or a slightly smaller interference fit tolerance.
4. The amount of expansion and contraction of the shaft is not considered in the design.
The operating temperature of the exciter is generally 35-60 ° C, and the amount of expansion and contraction of the shaft cannot be ignored due to thermal expansion and contraction.
Solution: Design one end bearing into a transition or clearance fit so that the exciter shaft can slide relative to the inner ring during thermal expansion and contraction.
information about vibratory finishing machine : https://www.zhongyun-machine.com
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|Target State: Australian Capital Territory|
Target City : Huzhou
Last Update : 24 May 2019
Number of Views: 50
|Item Owner : machineunique|
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