Excavator with ripper equipped with reverse blade - Drawings

Contents

1. INTRODUCTION

2. PATENT SEARCH

3. REPLACEABLE WORKING EQUIPMENT OF EXCAVATORS

4. DEFINITION OF BASIC PARAMETERS

5. TRACTION CALCULATION

6. TILLER STRENGTH CALCULATION

7. PERFORMANCE CALCULATION

8. WORK SAFETY REQUIREMENTS

9. LITERATURE USED

10. APPLICATION

1. introduction

A single bucket excavator is a self-propelled excavating machine with a ladle-shaped working tool designed to develop soils and move them over certain distances into vehicles or dumps.

Single-bucket excavators are among the most common machines: they are widely used in civil, hydraulic and transport construction. In the working cycle of single-bucket excavators, the ladle is filled by lifting it and moving it to the unloading place, unloading the ladle, returning the empty ladle to the bottomhole, lowering it to the initial position for the next cycle.

The main parts of the excavator include working equipment (ladle, handle, boom), power plant, rotary platform with mechanisms installed on it, support frame and running equipment.

The handle may be single-beam or double-beam. Both types of handle are welded structures made of sheet or shaped rolled stock. The cross section may be rectangular or circular. Front end of handle is articulated or rigidly connected with bucket. Single-beam handles are simple in design and are used for machines with a bucket up to 1 m3. Two-beam handles are more complex in design, but they have more rigidity and use them for machines with a bucket capacity of more than 1 m3.

Booms of excavators are welded of box section from sheet steel or stamped and bent profiles, as well as welded grates from shaped rolled stock. Booms of box section can be double-beam at single-beam handle and single-beam at double-beam handle.

Excavator buckets are welded, welded or combined. Welded ladles made of high-marganteal steel are reliable in operation, but heavy. More common are welded buckets with replaceable visors, which are made of high-marganteal steel. Such buckets are quite reliable, easy to manufacture and have a significantly lower mass compared to welded ones. To reduce weight, ladles are sometimes made of light alloys, and for reinforcement they are armoured with sheet steel up to 8 mm thick. The front wall of the bucket is made with a flat-shaped visor on which the teeth are installed, or an oval-shaped visor without teeth (D.I. Fedorov's bucket). Buckets with such visors allow to reduce the resistance arising when digging soil. However, in this case, the lateral component increases, which tends to draw the bucket with the handle to the side, due to which additional loads on the saddle bearing and boom appear. Ladle D.I. Fedorov is advisable to use for draglines or when developing low-binding soils.