The XXXVI International Scientific Symposium "Multidisciplinary Studies of the Turkish World" The 25 th of March 2023 ISBN: 978-605-72481-0-7 Eskishehir / Türkiye ---184---
TECHNICAL SCIENCE / FEN BİLİMLERİ / TEXNİKİ ELMLƏR UDK 622.276.5.05
OPTIMIZATION OF THE PLATE BRAKE DESIGN, USED ON LIFTING MACHINES Sevda Aliyeva PhD, Associate Professor
Azerbaijan State Oil and Industry University, Azerbaijan
Abstract : Brakes of various designs are used on lifting machines. In order to reduce the geometric
dimensions of the structure and increase the reliability of the braking system, multi-disc brakes have recently
been used (Fig.1).
The brake consisted of flat plates (1), one of which was connected in series to the shaft through the
housing (3), and the other (4) - through the key (5). These plates are capable of moving in the direction of the
axis.
In this design, the plates are compressed together by the compression force of the cylindrical spring
(2) F acting in the direction of the axis, which creates a friction moment on the contact surfaces equal to the
braking torque at a price.
On the other hand, the rupture of the brake pads is carried out by an electromagnet (6), the traction
force of which exceeds the compression force of the spring. The report diagram of the brake is shown in Figure
2.
Since these brakes are mounted on sharp high-speed shafts, when braking, the surface of the plates
heats up, which leads to temperature stresses on these surfaces, the formation of fatigue cracks on the surfaces,
and after a certain time to their destruction.
Keywords: electromagnet, undesirable factors, pulley, brake pads, thermal stress, wear resistance,
target function
. In the conditions of rapid development of the machine-building industry, the correct choice of the main
parameters of plate friction brakes and the search for optimal design dimensions remains relevant today.
Figure 1. Lifting mechanism brake When considering the issue of design optimization, it is more convenient to take the sum of such
undesirable factors as the objective function, i.e. the cost of metal plates of the design
𝑔
01
, the price of brake
pulleys
𝑔
02
, and from the thermal stress
𝜎
𝜑𝜑
the sum of the costs of eliminating defects that occur in the design
𝑔
03
. Then for the objective function we can write the following expression[ 3]:
𝒈
𝟎
= 𝒈
𝟎𝟏
+ 𝒈
𝟎𝟐
+ 𝒈
𝟎𝟑
(𝟏)
where
𝒈
𝟎𝟏
= 𝒂
𝟏
𝒎
𝟏
-
is calculated by the expression
𝒎
𝟏
,
𝒂
𝟏
-
is the price of 1 kg of metal brake
elements involved in braking;
𝒎
𝟏
-
is the mass of metal brake plates [1].
