What are the key points to pay attention to in the daily operation of vibrating screens?
In mineral processing plants, vibrating screens mainly rely on their
vibration characteristics to complete classification, dewatering, and desliming
operations. Due to the complex working environment of the vibrating screen,
prolonged continuous operation and heavy loads, the vibrating screen will
inevitably suffer damage or even malfunction. To ensure the normal screening
operation of the beneficiation plant and extend the service life of the
vibrating screen, we need to use the vibrating screen correctly. So, what operational points should we pay attention to during the daily
operation and operation of the vibrating screen? Before starting the vibrating screen, conduct equipment inspection The operator of the vibrating screen should fully understand and be
familiar with the structure and working principle of each part of the vibrating
screen. Before starting the vibrating screen, the operator should prepare for
driving, check the condition of the drive belt or tire coupling, the integrity
of the screen mesh, and the condition of other parts and components. For
example, whether the connecting components such as screws are securely fastened,
whether electrical components have failed, whether the spindle of the vibrator
is flexible, and whether the bearing lubrication is good. 2. Correctly start and stop Vibration screens are commonly used in crushing and screening processes or
washing processes, and require no-load start-up and shutdown. Therefore,
operators need to follow the principle of starting in reverse process flow and
stopping in sequence with process flow. When starting the vibrating screen, it
is necessary to close the knife switch, connect the line to the power grid,
press the start button, and complete the start in one go. Except for special
accidents, it is not allowed to park the vibrating screen with materials. When
parking, press the parking button to complete. 3. Ensure proper lubrication of the vibrating screen The lubrication work of the vibrating screen mainly refers to the
lubrication of the vibrator bearings, transmission gears, and transmission
motors. The lubrication of vibrating screens is divided into two types: grease
lubrication and thin oil lubrication. For vibrators lubricated with grease,
high-quality lithium based grease with a temperature range of -30~120 ℃ should
be used. Under normal working conditions, each vibrator is generally oiled with
150-200g of grease within 24 hours. If the working environment of the vibrator
is harsh, it can also be oiled once every 8 hours, and it is recommended to use
a high-pressure grease gun for oiling. For vibrators and gears lubricated with
thin oil, high-quality gear oil can be used. When the ambient temperature is
less than 5 ° C, industrial gear oil No. 70 can be used; When the ambient
temperature exceeds 5 ° C, use industrial gear oil grade 90. The amount of fuel
added should depend on the structure of the vibrator. When the oil is added and
the oil level check rod is removed, a small amount of oil droplets continuously
drip out, which meets the requirements. For newly installed vibrating screens, the lubricating oil needs to be
replaced once after 80 hours of operation, and every 300 hours thereafter. In
winter and summer, due to significant temperature differences, it is recommended
to use lubricants with different viscosities. In addition, when injecting oil,
it is necessary to clean the nozzle and the area around the oil injection port
to prevent dust from entering the oil chamber. 4. Clarify the rotation direction of the vibrator For a circular vibrating screen, the rotation direction of the vibrator can
be either in the direction of the material flow or against the direction of the
material flow. When rotating in the direction of the material flow, the material
passes through the screen surface at a faster speed, which is beneficial for
improving the processing capacity of the circular vibrating screen; When the
material rotates in the opposite direction of the material flow, the speed of
the material passing through the screen surface is slow, and the material is
prone to blockage. At this time, it is necessary to increase the inclination
angle of the screen surface appropriately. For a self synchronous linear
vibrating screen, the two eccentric masses are generally driven by two motors,
and the characteristics of the two motors must be the same, while the rotation
direction must be opposite. For asynchronous linear vibrating screens, there is
no clear regulation on the direction of rotation. 5. Adjust the amplitude of the vibrating screen in a timely manner During the production process, if the operator finds that the amplitude of
the vibrating screen cannot meet the requirements of the screening operation,
they can adjust its amplitude in a timely manner. For example, if the vibrating
screen uses a block eccentric vibrator, the operator can adjust the angle
between the main and auxiliary eccentric blocks. The angle decreases, the
excitation force increases, and the amplitude increases; On the contrary, as the
angle increases, the excitation force decreases and the amplitude decreases. If
the vibrating screen adopts a shaft eccentric vibrator, the operator can
increase or decrease the counterweight on the flywheel and pulley to increase or
decrease the amplitude of the vibrating screen.
