Optimal design of helical reducers for cement equipment

Evgeniy Gudov,Sergey Lagutin,D Karaivanov

doi:10.1051/matecconf/201928701016

Evgeniy Gudov, Sergey Lagutin + Show 1 more

Open Access

https://doi.org/10.1051/matecconf/201928701016

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Abstract

The trends in raising the technical level of multistage helical reducers for drives of cement, metallurgical and other heavy equipment are considered. An interactive method for optimizing the geometrical parameters of reducers with various gear ratios is proposed, which ensures equal strength of the stages in contact and bending endurance. It is shown that an increase in the hardness of the teeth requires an increase of the module and helical angle of the teeth, limitation of gear ratios, and to reduce the difference in center distances of adjacent stages. When creating a new generation of reducers, the transition to gears with carburized teeth leads to an increase in load capacity of 2.5-3 times. The examples of gear drive design for rotary kilns and ball mills are considered.

Highlights

The specifics of reducers for heavy equipment and their optimization issuesThe Elektrostal Heavy Engineering Works (EZTM) has accumulated a large theoretical and practical experience in creating reducers, primarily for drives of rolling and tube-rolling complexes operating under conditions of full process flow, as well as for drives of metallurgical, mining and other heavy equipment.Due to the individual or small-scale nature of production, it is impossible to verify the performance characteristics of such reducers on the test benches
Operational parameters are guaranteed on the basis of engineering calculations, the reliability of which is ensured by a scientific approach, practical experience, as well as an archive containing several thousand projects of various reducers that are in long-term operation in difficult conditions of metallurgical workshops and mining careers
Special attention is paid to the choice of the optimal kinematic scheme, ensuring equal strength of all stages, placement of gears in a housing with limited dimensions, maximum use of the internal volume of the housing

Summary

Introduction

The Elektrostal Heavy Engineering Works (EZTM) has accumulated a large theoretical and practical experience in creating reducers, primarily for drives of rolling and tube-rolling complexes operating under conditions of full process flow, as well as for drives of metallurgical, mining and other heavy equipment. = m / Tn, where m is the weight of the reducer in tons, Tn is the nominal torque on the low-speed shaft, kNm This indicator depends on many factors: the required design scheme, gear ratio, mode and service life, not least on the skills of the designing engineer, but, above all, from the current methods of thermal and mechanical treatment of the teeth. Taking into account the technological capabilities of gear processing and thermal equipment, EZTM reducers, according to their technical level, can be roughly divided into the following four groups (Table 1) In this table, De is the outside diameter of the largest gearwheel, awL is the center distance of the low-speed stage. Optimization in gear engineering can be performed at three levels: a single gear pair, a multi-stage reducer of a given type, and the drive of the machine as a whole. A change in the latter can be achieved by using new basic racks in serial production or large addendum modification in individual one

Optimization of the design parameters of multi-stage reducers

Mastering the market FOR cement equipment drives

New reducer for cement mills drive

Findings

Conclusion