The existing problems of exciter construction
1.The shell of the exciter used to be a split structure, the shell is composed of the upper end cover, the barrel and the lower end cover, which are connected together by bolts. The concentricity is ensured by the matching surface of the upper and lower end cover and the barrel body. The two sets of bearings are located in the upper and lower end cover respectively. The structure of split type is complicated and bulky, and the processing surface is more, the process cost is high. When the machining accuracy is low, the overall effect of the exciter will be affected. In addition, the bolts fixing the upper and lower end covers will become loose due to vibration during the operation of the vibratory separator, so they need to be tightened regularly, which increases the maintenance amount.

2.The dial is connected with the shaft by key, and there is a circular groove on the ring plane. Through this groove, the lower eccentric block is fixed with bolts. At the same time, the phase angle between the eccentric block and the upper eccentric block can be adjusted through this groove to effectively change the movement track of the material, extend or shorten the standing time of the material on the sifter, thus achieving the ideal screening effect. There is a round nut under the dial, whose function is to prevent the dial and the lower eccentric block from moving down. There is also a connection plate below the round nut that holds the flexible drive parts in place. This structure is not only complex but also large processing and high production cost.
3.The fixing of the double flange exciter is to put the exciter into the vibrator supporting structure first, that is, the lower end cover of the exciter is put into the lower support plate of the vibrator supporting structure. Then the exciter is hit with a hammer so that the shaft axis is perpendicular to the upper and lower support plates to ensure that the shaft axis of the exciter and the center line of the vibrator separator coincide. Then put on the fixed briquetting and press flange tightly of the upper end cover. Finally, placing the spring washer and bolt, and tightening the bolt symmetrically to compress the fixed briqueting to indirectly tight the exciter.
The improvement project
1.The new improved shell adopts the integral structure, which combines the upper and lower end cover and the barrel into a whole, so that its structure is simplified. The two sets of bearings are installed at both ends of the shell, so their concentricity can be guaranteed during machining without considering other fit sizes and grades. The barrel portion of the integral structure is much smaller than the split structure, and the wall thickness can be reduced by adding ribs, which not only reduces the weight but also reinforces the strength, so that the weight of the vibratory separator of the same specification is reduced more, and also reducing the energy consumption.
2.The dial and the connecting plate with the fixed flexible drive parts are integrated into one. When the phase angle between the upper and lower eccentric blocks needs to be adjusted, the locking bolt of the lower eccentric block can be loosened, and the lower eccentric block can be rotated so that its center line can be rotated to the position of the required scale, then the bolt can be rotated. To prevent axial movement of the lower eccentric block and dial, shaft end bolts can be used and held in place by a press plate. This structure is easy to install and maintain, reduces the cost, and increases the strength of the lower eccentric block.
3.After the improvement of the exciter shell, dial and other structures, its weight is reduced a lot, so the defects of the double-flange structure are prominent. We design the single-flange structure, and determine the position and size of the flange according to the different specifications of the vibratory separator, so as to meet its use requirements and ensure its strength.This structure not only reduces the manufacturing procedure, but also reduces the installation and maintenance steps, reduces the labor intensity and workload, especially increases the concentricity of the exciter and the vibrator separator, and reduces the interference of other factors.
4.In the past, oil filling or oil changing of the exciter can only be carried out during maintenance, which may easily cause oil shortage of the bearing. Lubricating oil is the blood to ensure the normal work of the bearing, when there is too little or no oil, the bearing will not be well lubricated, which causes increased friction and temperature, and eventually burns out the bearing, reducing the service life. In order to solve this problem, we added an oil filling hole on the bearing outer pressure cover, and conducted regular quantitative refueling through the oil filling pipe and hole, so as to ensure the normal operation of the bearing and increase its service life.
Vibration exciter is the heart of the vibratory separator, once the failure or poor performance occurs, which will directly affect the use of the machine.Therefore, we optimize the design of vibratory separator to ensure its normal use.