Excavator Working Equipment Project

Contents

Introduction

1. Source Data

2. Sizing the Excavator Base Part

3. Calculation of ladle parameters

4. Determination of linear dimensions of boom and handle

5. Selection of hydraulic cylinder sizes

5.1 Selection of ladle hydraulic cylinder size

5.2 Selection of hydraulic cylinder size of handle

5.3 Selection of boom hydraulic cylinder size

6. Parameters of pump-power plant. Selection of pump and prime mover sizes

7. Parameters of rotary platform drive and selection of hydraulic motor size

7.1 External loading parameters

7.2 Shear resistance during rotation of rotary part

7.3 Selection of hydraulic motor size

8. Drive parameters of running devices. Selection of hydraulic motors sizes

9. Excavator performance

List of literature

Introduction

Currently, hydraulic machines with rigid suspension of working equipment prevail in the fleet of construction single-bucket excavators. Their wide distribution is due to the undeniable advantages of a hydraulic volume drive over a mechanical one, namely: the ability to realize large forces on working bodies with minimum sizes of transfer devices, the possibility of power action on working bodies in both direct and return directions, the simplicity of kinematic connections between energy sources and consumers.

Buckets of straight and reverse shovels, loader and grab are used as main working elements on hydraulic excavators. In the course design we consider a pneumatic wheel excavator with working equipment reverse shovel.

Reverse shovel is the main working equipment for soil development below the level of excavator parking. It is used when digging pits, trenches, when planning slopes and filling embankments. It can be used for loading operations. During reverse shovel operation soil is dug towards excavator. Hydraulic excavators with a reverse shovel can develop soil above the level of their parking, although with less efficiency than a straight shovel.

1. Source Data

Excavator weight, t

14,2

Bucket:

type

03

capacity, m 3

0,8

Running gear:

type

caterpillar

soil pressure, kPa

70

Company settings, m

digging depth

3,3

(minimum)

digging radius at parking level

7,0

unloading height

2,5

Design soil:

look

sandy loam

density, t/m 3

1,25

specific resistance to digging, kPa

115