Selection and calculation of the main parameters of the T-130 rotary bulldozer

Contents

CONTENTS

Task

Introduction

1. Design Overview and Analysis

2. Selecting Basic Parameters

3. Traction calculation

4. Calculation of control mechanisms

5. Strength calculation

Conclusion

List of sources used

Introduction

The large and growing scale of construction is ensured by the use of high-performance construction and road machines, complex mechanization and automation of construction production. Currently, a large fleet of various construction and road machines has been created, which is systematically replenished with new and more advanced machines.

To perform earthworks, universal and specialized construction machines have been created - excavators, staplers, bulldozers, graders, auto graders with lightweight control and convenient cabins. In this work, we will consider bulldozers in more detail.

Bulldozer - an earth-moving machine consisting of a basic tractor and bulldozer (mounted) equipment designed to cut and move soil and plan the developed surface.

Bulldozers as mounted equipment for tractors, tractors and other basic machines are widespread, due to the simplicity of their design, high productivity, the possibility of their use in a wide variety of soil and climatic conditions and the relatively low cost of work performed. They are used in road, railway, mining, land reclamation and irrigation construction.

For most modern tracked bulldozers, the economically profitable range currently does not exceed 6080 m, wheeled 100150 m.

Design Overview and Analysis

By purpose, bulldozers are divided into general-purpose bulldozers, adapted to perform a variety of excavation, planning and construction work in various soil conditions, and special-purpose bulldozers, which are intended to perform certain types of work (for example, for laying roads, cleaning snow, peat removal, etc.).

According to the power of the engines of the base machines, modern bulldozers can be conditionally divided into the following groups (Table 1).

Classification of bulldozers by nominal tractive force is given in Table 1.

According to the type of propeller of the base machine, bulldozers are divided into tracked and wheeled. Wheel bulldozers are created to base of wheel tractors, wheel tractors, cars and specialized self-propelled cars (graders, etc.).

By the placement of the working element of the bulldozer equipment on the base machine, bulldozers with the front and rear location of the dump are distinguished.

In hydraulic-controlled bulldozers, the dump is forced into the ground as a result of forces developed by the hydraulic system. These forces can reach 40% or more of the total weight of the tractor. During hydraulic control, four positions can be set to the dump: lifting, forced lowering, floating position, fixed position.

Distinguish: a bulldozer with a non-rotating dump, i.e. a bulldozer, the dump of which has an unchanged position in the horizontal plane, perpendicular to the longitudinal axis of the machine; bulldozer with rotary dump, i.e. bulldozer from which it is possible to change position of dump in horizontal plane.

On the universal frame of the bulldozer, instead of a dump, the equipment of a bush cutter, a rooster-collector or a snowplow can be installed.

Conclusion

During the course work, he studied the possible structures of bulldozers, as well as the classification of bulldozers according to various features and parameters. In addition, he selected and calculated the main parameters of the bulldozer, adjusted them according to standard values. He made a traction calculation of the bulldozer, as a result of which he found out that the traction force developed by the bulldozer was enough to perform work under given conditions. Calculated the dump control mechanism; determined the force acting on it when accidental loads occur. According to the received data, he chose a hydraulic cylinder for lifting the dump.

List of sources used

Road cars: Textbook for universities. Part 1: Earthworks/T.V. Alekseev [et al.], 1972. - 504 s.

Handbook on resistance of materials: reference publication/G.S. Pisarenko, A.P. Yakovlev, V.V. Matveev. - 2nd ed. and additional - Kiev: Naukova Duma, 1988. - 736 c.