Analisa Tingkat Getaran dan Kebisingan Vibrating Screen Crusher FC 02 pada PT Mifa Bersaudara

Tujuan dari penelitian ini adalah menganalisa tingkat getaran dan kebisingan pada Equipment Vibrating screen crusher FC 02 pada PT. MIFA Bersaudara. Getaran diukur dengan menggunakan alat vibration meter, kebisingan diukur dengan sound level meter dengan tipe digital. Pengukuran dilakukan pada sumbu x,y dan z pada setiap titik pengukuran. Hasil penelitian menunjukan bahwa nilai tingkat getaran pada vibrating screen crusher FC 02 pada sumbu x dengan nilai velocity 28,56 mm/s, sumbu y nilai 29,82 mm/s dan sumbu z nilai velocity 25,46 mm/s. Sedangkan nilai Acceleration pada sumbu x sebesar 20,7 m/s2 nilai 30,86 m/s2 pada sumbu y dan z sebesar 21,42 m/s2. Sedangkan nilai kebisingan menujukan bahwa nilai rata-rata pada sisi kanan menujukan sebesar 99,6 dBA pada sisi kanan dan pada sisi kiri sebesar 101,7 dBA. Upaya yang dilakukan untuk mengatasi masalah yaitu dengan cara tidak mengoperasikan vibrating screen crusher FC 02 melebihi batas maksimum yang di anjurkan 60 dBA dan maksimum yang diperbolehkan yaitu 70 dBA sehingga dapat mencegah terjadinya permasalahan kenyamanan, kesehatan, dan keselamatan kerja. Operator berserta karyawan disarankan berada dilokasi tersebut tidak lebih dari 15-30 menit, jika lebih dari waktu tersebut harus menggunakan earmuff safety.

Numerical simulation of particle screening efficiency of large multi-layer vibrating screen based on discrete element method

With the increasing requirements for energy conservation and environmental protection, multi-layer vibrating screens have become hot issues. Compared with single-layer vibrating screens, multi-layer vibrating screens has much better performance in terms of processing effect, treatment capacity, and environmental protection. The research on the physical parameters of the multi-layer vibrating screen is of great significance to the actual production. However, analysis and simulation studies of multi-layer vibrating screens are limited. In this paper, the screening process of wet particles on a multi-layer vibrating screen was simulated by using the discrete element method. The characteristics and application scope of the two vibration modes were analyzed. The particle penetration rate, the number of collisions, and the distribution of the particles under 23 combinations of structures and vibration parameters were investigated. The influence of different parameters on screening performance was analyzed. Several optimal combinations of frequency, amplitude and screen inclination angle under different working conditions were obtained. The screening efficiency of the balanced elliptic motion is higher than that of the linear motion. The best combination of the three parameters is 4 mm amplitude, 20 Hz frequency, and 3° inclination angle. The efficiency is higher when the particles follow a distribution of arithmetic on the screen. This study provides a reference for the efficient operation and optimal design of large multi-layer screening equipment.

Substantiation of amplitude-frequency characteristics and design parameters of vibration exciter in volume oscillation separator

The main effects of the developed design for vibratory separator: the increased driving force in the process of bulk material separation in this work, achieved by providing the working cylindrical-conical container with vibrational motion; improving the conditions for the passage of product particles through openings, achieved by providing the sieve surface with volume oscillations; reduction of energy consumption and improvement of operating conditions for support nodes during the operation of the designed vibrating screen, achieved due to the installation of additional elastic elements between the separator body and bearing assemblies of the vertical drive shaft in vibration exciter. Providing the working bodies of the designed vibrating screen with volume oscillating motion allows increasing the performance and quality of the separation process of solid bulk materials. To determine the rational parameters for vibration screening process, the equations of motion of working bodies as a conical sieve surface were obtained using the method of the Lagrange equations of the second order. When applying solutions of the Cauchy problem for linear nonhomogeneous differential equations, the solution of the latter was obtained. The obtained dependences of oscillation amplitudes, vibration velocity and vibration acceleration, and the intensity of oscillating motion allowed us to perform a mathematical analysis for power and energy parameters of vibration drive in the developed separator. The inclined placement of the conical sieve surface allows for spatial gyration or circular translational motion, which makes it possible to realize the advantages of volumetric separation of bulk materials. The results of the conducted analytical study made it possible to substantiate the optimal inclination angle for working sieve surface. Based on our analysis, the design parameters of vibration exciter were substantiated and clarified, and the design of this technical system was demonstrated.

Dynamic Characteristic Analysis of Vibration Screen Based on Joint Face Analysis

Vibrating screens play an important role in industrial production. While the cross beam fracture is the main reason for the shutdown of the screen. In order to solve the problem of fatigue fracture of the beam of the large-scale vibrating screen, the 3.6x7.3 m banana vibrating screen was taken as the research object, and the joint surface analysis was introduced at the joint surface of each part of the beam to simulate the stiffness and stress concentration of the joint surface, so that the nonlinear problems will be transformed into linear problems, and the stress and deformation of the connection area are correctly simulated, thereby this project has given an accurate basis for further optimization and optimizing the structure.

Analysis of Vibration and Noise on Vibrating Screen at PT. Mifa Bersaudara

The purpose of this study was to analyze the level of vibration and noise on the Equipment Vibrating screen crusher FC 02 at PT. MIFA Bersaudara. Vibration is measured using a vibration meter, noise is measured by a digital sound level meter. Measurements are made on the x, y and z axes at each measurement point. The results showed that the value of the vibration level on the Vibrating screen crusher FC 02 on the x-axis with the velocity value of 28.56 mm/s, the y-axis value of 29.82 mm/s and the z-axis velocity value of 25.46 mm/s. While the Acceleration value on the x-axis is 20.7 m/s 2 the value is 30.86 m/s 2on the y and z axes of 21.42 m/s 2 . While the noise value indicates that the average value on the right side is 99.6 dBA on the right side and 101.7 dBA on the left side. Efforts were made to overcome the problem, namely by not operating the VSC FC 02 exceeding the recommended maximum limit of 60 dBA and the maximum allowed which is 70 dBA so as to prevent problems of comfort, health, and safety at work. Operators and employees are advised to stay at the location for no more than 15-30 minutes, if more than that time must use safety earmuffs.

Forward Dynamic Solution and Optimization of a 1-DOF Parallel Mechanism for Vibrating Screen

In this paper, the ordered single-open-chain (SOC) method in combination with the principle of virtual work is adopted to model and solve the forward dynamics of a single degree-of-freedom (DOF) parallel mechanism (PM), featuring one translation and two rotations (1T2R), which is applied in spatial vibrating screen (i.e., parallel vibrating screen mechanism, PVSM). Afterwards, the dynamic performances of the PVSM is optimized using differential evolution algorithm. Based on the kinematics of the PM, the forward dynamic model is derived and the dynamic response equation is built, of which the coefficient matrix is determined by means of the generalized velocity equation. Moreover, the Euler method was adopted to solve the numerical solution of the differential equation of motion to characterize the motion law and dynamics of the screen surface of the PVSM, which is verified with ADAMS simulation. With the parametric model, the dynamic optimization of PVSM is carried out to maximize the energy transfer efficiency, subject to the constraints on the link mass. The comparison of the dynamic performances of the PVSM with and without optimization reveals the improvement of the PM.