Page 24 - June

METALWORKING EQUIPMENT AND TOOLS

The so-called "light" place of the circle is a point diametrically opposite to the point of the
"heavy" one, which is always located below on an unbalanced circle. The design of the adapter
flanges for grinding wheels of sharpeners provides for the presence of three balancing weights
(segments) on the inner flange, which are moved during balancing along a special groove. After
the "light" place of the circle is established (and marked with a marker), the middle balancing
weight is moved into it, and the two extreme ones are set at approximately equal distance from
it. If the heavy part of the circle will still tend to take the lower position, then the extreme "
shear blocks" are brought closer to the middle one, and vice versa [3]. A balanced circle on
the balancing stand (after a light push) must stop in an arbitrary manner. The markings on the
circle must not occupy the same position. To facilitate the process of static wheel balancing, first
loosen the locking screws of the balancing weights and drive them around the circumference of
the groove on the inner flange, at the same time removing them from the groove accumulated
dust and dirt.

STATIC BALANCING OF FANS OF INDUSTRIAL
VACUUM CLEANERS
Under industrial vacuum cleaners, as already
noted above, dust-collecting ventilation units of the
ZIL-900 M type are positioned here. These units
are used in tandem with sharpeners in auxiliary
(mechanical) production, when the installation of
special ventilation systems is not always advisable
due to their high cost. energy consumption and
complexity of installation. Often, a more rational
solution is to use dust-collecting units designed to
remove abrasive dust from a particular sharpener
[5]. Most of these industrial vacuum cleaners come
from the USSR. And currently they are operated on a
leftover basis, without any looking back at the once-
existing SPR system. Failed veteran dust collecting
units are sent mainly to the scrap. Such new industrial
vacuum cleaners are purchased in exchange, and
they repeat the fate of their predecessors.
The main mechanical reason for the failure of these units is the destruction of the bearings
of the rotor shaft of the electric motor, on which the impeller with "blades" is mounted, and the
subsequent deformation (bending) of the rotor shaft (Fig. 2).
After the deformation of the rotor shaft, when no routine inspections and minor repairs
can eliminate excessive noise (rumbling) and vibration of an industrial vacuum cleaner, the
unit is sent to scrap metal. The reason for this situation is a rapid drop in the level of technical
literacy not only of local production managers, but also of specialized specialists (ITR) of the

24 Stanochniy park