First, accurately position and install the bearing pedestal of the vibration exciter, and then weld the self-made locating sub table on the side plate of the vibrating screen, with the cross section of 20mm × 20mm is appropriate, and 0.3~0.5mm is appropriate for the clearance between the sub platform and the positioned parts.
In this way, the reamed bolt mainly plays the role of axial fastening of the bolt, and the positioning sub platform plays the role of controlling the radial runout of the bearing pedestal, thus realizing the axial and radial double constraints on the bearing pedestal of the exciter.
The positioning sub platform used is made of 35 high-quality carbon steel plates, which are turned into circular rings. During processing, the inner diameter of the ring shall be 0.3-0.5mm larger than the outer diameter of the bearing seat and pressure plate, so as to form a clearance fit during installation.
The section size of the ring can be determined according to the outer diameter and thickness of the bearing seat and pressure plate. The outer diameter of the exciter bearing seat and pressure plate of the concentrator is 600mm and the thickness is 40mm, so the cross section size of the sub table is determined to be 20mm × 20mm。
The construction of this technical transformation scheme is simple, and one vibrator can be completed within 1h. During construction, the prepared ring shall be sleeved on the outer diameter of the installed exciter bearing seat and pressure plate, and a feeler gauge shall be used to ensure its coaxiality with the bearing seat and pressure plate.
At the same time, the axial end face of the ring shall be closely contacted with the side plate of the vibrating screen, so that the outer diameter face of the ring and the side plate face of the vibrating screen form a welding angle, which is convenient for welding and ensures the welding strength. The inner diameter face becomes the installation sub platform of the exciter bearing seat.
- Implementation effect
After retrofitting the bearing pedestal of the vibration exciter with the above scheme, the production practice shows that this method effectively delays the occurrence of loosening of the fastening bolts of the bearing pedestal: after the installation of the bearing pedestal and pressure plate of the vibration exciter with damaged original reaming holes according to the technical retrofit method, the occurrence time of loosening of the fastening bolts of the vibration exciter has been extended from about a week before the technical retrofit to 3 to 6 months.
The installation of locating sub table on the bearing pedestal with undamaged reaming hole can make the bolt fastening time as long as one year, greatly reducing the amount of equipment maintenance and overhaul, thus ensuring the normal operation of production.
In addition, the technical transformation scheme is cheap and easy to implement, which can effectively prevent the vibrating screen exciter from loosening, and also provides a solution for fastening other parts of the vibration equipment in the plant.