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April 2024 Chief editor Ahmed Professor of Computational Mathematics and Numerical Analysis Faculty ofEngineering.
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CHIEF EDITOR
Ahmed Professor of Computational Mathematics and Numerical Analysis Faculty ofEngineering.
Zagazig University.
Zagazig.
Egypt.
Box 44519
EDITORIAL BOARD
Yu Li Wuhan University of Technology,China Seung Man Yu Seoul National University of Science andTechnology.
South Korea Seyed Saeid Rahimian Koloor Universiti Teknologi Malaysia.
Malaysia Eko Susanto Menegment of journal Indonesia Siti Mazlina Mustapa Kamal Universiti Putra Malaysia.
Malaysia
Q1 technology news and reviews ANALYSIS OF RANDOM VERTICAL VIBRATION OF BEARING MOUNTS
WITH STRAP ELEMENT OF BELT CONVEYOR ROLLER MECHANISMS
Akbarjon Jumaev Almalyk branch of Tashkent State Technical University named after Islam Karimov (PhD), associate professor Sherzodjon Raximboev Jasurbek Madatov jumaev@mail.
Abstract: The article presents ideas about the reliability and durability of belt conveyors in mining enterprises today, as well as the constantly increasing requirements for equipment.
The recommended values are presented through graphs representing the influence of the change in the vibration amplitude of the belt conveyor roller mechanism on the bearing flange and the roller mechanism shell, as well as the dependence of the torque on the axis of the roller mechanism on the change in the performance of the belt conveyor.
As a result, the analysis of scientific studies about the possibility of increasing the FIK compared to the traditional one has been presented.
Keywords.
Conveyor, roller mechanism, belt element, deformation, loading, transportation, amplitude, vibration, technology.
Today, belt conveyors are one of the most convenient vehicles for continuous delivery of products in various sectors of the economy.
In the field of mining, several sets of belt conveyors, which extend several meters in length, are used to transport minerals from deep quarries, as well as underground and surface mineral ores.
One of the main factors that determine the reliability of the belt conveyor is determined by the precision and durability of its components.
One of these important mechanisms is roller mechanisms, the share of work in the equi pment is 30-35%.
The main structural elements of belt conveyors are a guide roller mechanism, a guide drum and a belt that surrounds them.
Conveyor also includes other parts: belt compression and cleaning devices, handles, special roller mechanisms, automatic control and belt movement .
The cost of maintenance of the roller mechanism is 40%.
The service life of the roller mechanism on the conveyor is 2-2.
5 years, and the rollers working in the places where loading devices work are reduced to 1-3 months compared to those installed in other The reason is that due to the presence of external shocks, constant dust, and moisture in the mineral receiving areas, the periodicity of the roller mechanism decreases .
, .
When bearing supports with belt elements are used in the belt conveyor roller mechanism, as a result of the resulting deformation, the periodicity of the bearings But in this case, vertical vibrations occur in the roller mechanism.
Exceeding the vibration amplitudes in roller mechanisms can shorten the service life of the mechanism.
We assume that during the continuous operation of the roller mechanism, the loads falling on its belt element supports are the same, so the vibrations in it are in the vertical We use the Lagrange-II order equation to create a mathematical model of vertical oscillations of roller mechanisms with a belt element bearing support .
April Volume 1.
No-2
= ( )
here, q.
N are the generalized coordinate and its time derivative.
T, - kinetic and potential energies of the vibration system.
- dissipative function.
is the generalized force depending on the generalized coordinate .
Figure 1 shows the calculation scheme characterizing the vibration of the mechanism, taking into account the generalized coordinate axis .
of the potential and kinetic energy during the vertical vibration of the belt conveyor roller mechanism .
, .
where Fr.
m Ae is the impact force of raw materials.
direction of vibration.
msh Ae bearing shell mfl Ae the mass of the outer metal flange.
A, are coefficients of elasticity and dissipation of rubber bushing.
Figure 1.
Calculation scheme representing the vibration of the shell and flange of the recommended belt conveyor roller mechanism =2 N2 where, cn Ae is the stiffness coefficient of the strap element support, c1 Ae is the linear component of the stiffness coefficient, kc2 Ae is the non-linear component of the stiffness coefficient, mr.
m Ae is the weight of the raw material.
This formula gives the dissipative function of the vibration system .
where, bn Ae is the dissipation coefficient of the belt-element bearing support of the pulley Figure 2 shows the diagrams of changes in the vertical vibrations of the bearing support of the roller mechanism with a belt element at different values.
Q1 technology news and reviews a Ae iF0 = 1.
2 N A .
05 y 0.
b Ae F0 = 1,5 N A .
08 y 0.
c Ae iF0 = 1.
8 N A .
1 y 0.
Figure 2.
Diagrams of changes in vertical vibrations of the roller mechanism bearing support with a belt element at different values The analysis shows that the vibration amplitude increases with the increase of loading during raw material transportation (Fig.
2, a, b, .
In addition, the greater the external load, the greater the static movement of the roller mechanism.
During this movement, with a load of 1.
4 N A .
N by 1.
2a10-3 m, with a load of 1.
6 N A .
12 y 0.
N by a load of 1.
It reaches 5a10-3 m .
Based on the laws of processing the vertical vibrations of the roller mechanism, the dependence of the above graphs was considered and constructed.
Figure 3 presents graphs of the dependence of the change in the amplitude of the vibrations of the roller mechanism on the rotational force.
From the analysis of these graphs, it can be seen that the vibration amplitude of the roller mechanism increases from 0.
3a10Ae4 m to 0.
254a10Ae4 m when the load of 4.
5a10Ae2 kg is reduced from 0.
24 N to 1.
6 N.
By reducing the mass of the shell and flange of the roller mechanism to 3.
55a102 kg, the amplitude of movement of the roller mechanism increases from 0.
4a10Ae4 m to 0.
72a10Ae3 m.
The vibration amplitude of the roller mechanism does not exceed 0.
3a10Ae3 m.
It is considered appropriate to choose mr O .
74 y 4.
102 kg and F0 O .
0 y 1.
Figure 3.
Graphs of the dependence of the change in the amplitude of the vibrations of the roller mechanism on the rotational force April Volume 1.
No-2 Figure 4.
Graphs of the dependence of the change in the amplitude of vibrations at the speed of the belt conveyor roller mechanism on the change in the falling loads It is important to determine the amplitude of the speed fluctuations of the belt conveyor roller Fig.
4 shows the graphs of the dependence of the change of the amplitude of vibrations at the speed of the roller mechanism on the change of the falling loads.
Analysis of graphs shows that an increase in F0 from 0.
24 N to 1.
6 N at mr = 3.
74a102 kg can increase the amplitude of speed fluctuations of the roller mechanism up to 2.
4 m/s.
Taking into account the results of experimental studies, mr O .
74 y 4.
102 kg and F0 O .
2 y 1.
N values are recommended to ensure .
m/s .
Summary.
The analysis of vertical vibrations of the roller mechanism with belt conveyor belt element bearing support, taking into account the technological loads applied to it, was considered.
Graphs of the dependence of the vibration amplitude of the roller mechanism on the change of the force coming from the transported raw material were obtained and recommended values were References: