Asphalt Laying Hydraulic Diagram

Contents

Introduction

Selection of hydraulic motors by specified loads

1.1 Nominal pressure selection

1.2 Calculation of hydraulic cylinders

1.3 Calculation of hydraulic motors

1.4 Selection of pumps

Operating fluid selection

2 Calculation of pressure losses in the hydraulic system

2.1 Calculation of pipe diameters

2.2 Calculation of pipeline diameters in the secondary circuit

2.3 Calculation of pressure losses by pipeline length

2.4 Calculation of pressure losses in local resistance of pipelines

3 Check calculation of hydraulic system. Determination of efficiency

3.1 Check calculation of hydraulic system

3.2 Calculation of hydraulic motor power and efficiency

4 Thermal calculation of hydraulic drive

4.1 Calculation of required heat transfer surface

Conclusion

List of literature

Specification

Introduction

The wide use of hydraulic drive in all branches of engineering in various countries of the world is explained by the advantages of its use, which have been repeatedly mentioned in articles, reports and other materials. The main advantages of the hydraulic drive used in construction machines are:

1. Smaller weight and dimensions of the hydraulic drive compared to the weight and dimensions of mechanical and electric drives (due to the absence or reduction of the number of elements such as shafts, reduction gears, couplings, ropes, etc.);

2. Possibility of creating large gear ratios (up to 2000 and more in a volumetric hydraulic drive);

3. Small inertia of the hydraulic drive, providing its good dynamic properties, increasing the durability of the machine and allowing you to turn on and reverse working movements in fractions of a second. The cycle time is reduced, which increases the productivity of the machine;

4. Step-by-step control of the speed of working movements, which makes it possible to increase the coefficient of use of the drive engine, simplify its automation and improve the operating conditions of the driver;

5. A control facility that is characterized by a small energy consumption of the driver, regardless of the drive power, and the ability to automate not only individual operations, but also entire technological processes.

Operating fluid selection

For use in hydraulic drive of operating equipment we assign hydraulic fluid of VMGZ grade as per TS 3810147974, which has the following properties:

Viscosity - 0, 10· 104 m2/s.

Density - 865 kg/m3.

Temperature of hardening is not higher - 60 wasps.

The flash point is not lower than 135 ° C.

Operating range of temperature-50. +60 wasps.

The volume of liquid required to fill the system will be found later.

Conclusion

Calculation of volumetric hydraulic drive during course work

contributed to the consolidation of theoretical knowledge, developed skills

independent work when performing calculations, drawing design and drawing up text design documents.

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