Dependence Between the Percussion
Centre and the Uniformity of the Rotor
Movement
Mircea Fenchea
Abstract In the study of the working mill, insufficiently treated is the problem
of the hammer construction, the main working organs of the mill, which have a
decisive influence on the working regime. The paper emphasized the effects of the
construction of hammer and it is underlined the necessity to respect the existence of
one centre of percussion. The vibration measurements show the connection between
the centre of percussion and the vibration level.
1 Introduction
There are a lot of studies concerning the influence of the different factors, which
can contribute to the bettering of the operation indexes of the mills with hammers.
The problem of the hammers construction, (the main working organs of mill), which
have a decisive influence on the working regime it is insufficiently treated.
The main working organ of the mill is the hammer and its constructive form
determines the quality of the crushing and the specific consumption of energy.
The main working part of hammer crusher is rotors with hammer. The rotor
consists of main shaft, disk, pin shaft and hammers. Materials enter the crusher
through the feed opening and are stricken, impacted and cut by the high-speed
hammers to small size. The material is ground by repeated contact with these
hammers, contact with the walls of the grinding chamber, and particle to particle
contact. The size of the final product can be adjusted by changing the screening plate
under the rotor [1]. The percussion interactions between the hammer and material
produce additional perturbations, generating irregularities during the work [2, 3].
The process of crumbling, in the mills with hammers are determined by the percussive interactions between the hammers and the material. Each hammer is bind at the
rotor by a plane articulation so that it executes a relative rotation motion in relation
to the fixed axis of the rotor [4].
M. Fenchea (B)
“Politehnica” University of Timi¸ soara, B-dul Mihai Viteazul, nr.1, 1900 Timi¸ soara, Romania
e-mail: mircea.fenchea@upt.ro
© Springer Nature Switzerland AG 2021
N. Herisanu and V. Marinca (eds.), Acoustics and Vibration of Mechanical
Structures—AVMS 2019, Springer Proceedings in Physics 251,
https://doi.org/10.1007/978-3-030-54136-1_35
351
Centre and the Uniformity of the Rotor
Movement
Mircea Fenchea
Abstract In the study of the working mill, insufficiently treated is the problem
of the hammer construction, the main working organs of the mill, which have a
decisive influence on the working regime. The paper emphasized the effects of the
construction of hammer and it is underlined the necessity to respect the existence of
one centre of percussion. The vibration measurements show the connection between
the centre of percussion and the vibration level.
1 Introduction
There are a lot of studies concerning the influence of the different factors, which
can contribute to the bettering of the operation indexes of the mills with hammers.
The problem of the hammers construction, (the main working organs of mill), which
have a decisive influence on the working regime it is insufficiently treated.
The main working organ of the mill is the hammer and its constructive form
determines the quality of the crushing and the specific consumption of energy.
The main working part of hammer crusher is rotors with hammer. The rotor
consists of main shaft, disk, pin shaft and hammers. Materials enter the crusher
through the feed opening and are stricken, impacted and cut by the high-speed
hammers to small size. The material is ground by repeated contact with these
hammers, contact with the walls of the grinding chamber, and particle to particle
contact. The size of the final product can be adjusted by changing the screening plate
under the rotor [1]. The percussion interactions between the hammer and material
produce additional perturbations, generating irregularities during the work [2, 3].
The process of crumbling, in the mills with hammers are determined by the percussive interactions between the hammers and the material. Each hammer is bind at the
rotor by a plane articulation so that it executes a relative rotation motion in relation
to the fixed axis of the rotor [4].
M. Fenchea (B)
“Politehnica” University of Timi¸ soara, B-dul Mihai Viteazul, nr.1, 1900 Timi¸ soara, Romania
e-mail: mircea.fenchea@upt.ro
© Springer Nature Switzerland AG 2021
N. Herisanu and V. Marinca (eds.), Acoustics and Vibration of Mechanical
Structures—AVMS 2019, Springer Proceedings in Physics 251,
https://doi.org/10.1007/978-3-030-54136-1_35
351