Hydraulic equipment of excavator Eo 4124

Contents

Introduction

1.Excavators - purpose and classification

2. Single bucket excavator indexing system

3. Main types of hinged equipment

4.Patent analysis

5. Calculation of basic parameters

6. Calculation of the weld joint of the knife holder

7. Conclusion

List of used literature

Introduction

Earthworks occupy a large place in construction, and more than half of the work is carried out by single-bucket construction excavators.

The importance of these machines is also great in other sectors of the national economy, where they are used not only in the loading and unloading of various materials and the installation of structures, but also in the performance of reclamation, irrigation, agricultural, communal and other work. The quality of single-bucket excavators, the cost of their manufacture and operation largely depends on the cost of their work.

In recent years, universal hydraulic excavators have become widespread. In the search for new technical means when creating universal excavators, special attention has recently been paid to volumetric hydraulic transmissions that allow branching and remote energy transfer, free machine elements from mechanical connections, creating the basis for independent change in operating speeds and control of the working process. With the help of volumetric hydraulic transmissions, it is easier and more widely possible to continuously adjust the speed; they do not require scarce materials for their manufacture, they allow you to obtain, without mechanical transformation, any type of movement (translational, rotational, oscillatory).

Considering that volumetric hydraulic transmissions are characterized by high overload capacity, low inertia, susceptibility to automation, then with their use single-bucket excavators acquire new technical qualities that are not available for machines with mechanical transmissions.

Single bucket excavator indexing system

Indexation of single-bucket excavators is defined in GOST 3006793 "Single-bucket excavators are universal full-turn. General Specifications. "

The index of single-bucket universal excavators according to GOST consists of letters and numbers. The letters EO mean "single-bucket excavator."

The first digit is the size group of the excavator (operational mass, i.e. the mass of a fully filled excavator ready for operation with the main working equipment and with a driver whose weight is (75 ± 3) kg): 1 - up to 6.3 tons; 2 - over 6.3 to 10 tons; 3 - over 10 to 18 tons; 4 - over 18 to 32 tons; 5 - over 32 to 50 tons; 6 - over 50 to 71 tons.

The second digit is the type of running device: 1 - caterpillar; 2 - caterpillar with increased support surface of caterpillars; 3 - wheeled; 4 - on the basis of a special chassis of the automobile type; 5 - on the basis of a car; 6 - on the basis of a tractor.

The third digit is the performance of working equipment: 1 - with flexible suspension (cable); 2 - with rigid suspension; 3 - telescopic.

The fourth digit is the serial number of the model (1; 2; 3).

Then the letter designation of the next modernization (A, B, V.) is indicated, followed by the letter designation of the climatic version (CL, T, TV), in its absence - for the temperate climate.

Conclusion

During the course project, we were able to design working equipment for a hydraulic excavator.

A review and analysis of existing structures was carried out, the classification of machines was carried out, a description of working mechanisms was given, and a patent review was made. Description of the designed structure is given.

The equipment for the hydraulic excavator was calculated, the hydraulic equipment was also calculated and the hydraulic cylinder was selected.