Bulldozer loosener

Contents

Contents

Introduction

1 Traction calculation of ripper and determination of its capacity

1.1. Traction calculation

1.2. Ripper capacity

2 Calculation of cutting forces

2.1 Selection of design positions and strength calculation

2.2 Determination of forces developed during lifting and deepening of ripper struts

2.3 Calculation of operating position change mechanism pin

3 Calculation of hydraulic drive

3.1 Initial data

3.1.1 Initial data

3.1.2 Selection of pump type and grade

3.1.3 Selection of hydraulic cylinder

3.1.4 Selection of hydraulic distributor

3.1.5 Selection of brake valves and hydraulic locks

3.1.6 Piping selection

3.2 Verification calculation

3.2.1 Calculation of pressure losses in the hydraulic system

3.2.2 Calculation of output parameters of hydraulic cylinders

3.2.3 Calculation of hydraulic drive efficiency

3.2.4 Thermal calculation of hydraulic drive

List of literature used

Introduction

Looseners are designed for loosening soils on large areas and stripes. They are also used to remove large stones from the soil, break into old road clothes, frost, etc.

Currently, rippers are made only by hinged, and previously manufactured trailed rippers are discontinued. The reason for this is the great maneuverability of hinged rippers and the use of tractor gravity to deepen.

The working equipment of the ripper, which consists of teeth and a suspension frame, is hung to the body of the tractor rear axle and to its frame in three or four points. Teeth, as a rule, are rigidly attached to the frame.

Depending on the purpose of the ripper and the type of work performed, the number of teeth can be different and usually ranges from one to five. In heavy work, for example, when loosening frozen soils, single-toothed looseners are used. Therefore, the teeth must be removable to control their number. Tillage of homogeneous soils can be carried out by five-tooth tillers. The teeth themselves are straight or curved and are usually provided with removable tips.

The deepening mechanisms are installed hydraulic, which provides gravity forces of the tractor on the teeth.

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