Hydraulic motor crane

Contents

Introduction

1 Purpose and arrangement of the crane

2 Calculation of load lifting mechanism

2.1 Selection of kinematic circuit

2.2 Hook Suspension Selection

2.3 Rope Selection

2.4 Drum calculation

2.5 Engine selection

2.6 Gearbox selection

2.7 Selection of couplings and brakes

2.8 Verification calculations

2.8.1 Engine check for acceleration time

2.8.2 Engine heating check

2.8.3 Engine check for braking time

3. Calculation of boom departure change mechanism

3.1 Construction of diagram for determination of forces in boom polyspast

3.2 Determination of forces in boom polyspast

3.3 Rope selection and drum calculation

3.4 Engine selection

3.5 Gearbox selection

3.6 Selection of couplings and brakes

3.7 Verification calculations

3.7.1 Engine check for acceleration time

3.7.2 Engine check for braking time

4. Calculation of crane turning mechanism

4.1 Construction of design diagram of the crane and determination of design parameters

4.2 Definition of support reactions and selection of bearings

4.3 Determination of turning resistance moments

4.4 Engine selection

4.5 Gearbox Selection

4.6 Selection of couplings and brakes

4.7 Verification calculations

4.7.1 Engine check for acceleration time

4.7.2 Engine check for braking time

5. Crane stability

6. Safety requirements for crane operation

List of sources used

Introduction

In the process of preparing the future engineer for the independent solution of technical and production tasks, one of the leading places belongs to course design.

The purpose of this course project is to consolidate and summarize the theoretical material set out in the course "Lifting Vehicles."

Lifting machines are a highly efficient means of complex mechanization and automation of lifting, loading and unloading and storage operations. The use of such machines reduces the use of heavy manual operations and contributes to a sharp increase in productivity. Lifting machines are used in all sectors of the national economy. They use various mechanisms, drives, steel structures, etc., very clearly identify the actions of loads, especially dynamic ones.

Like any branch of mechanical engineering, cranostroy has its own specifics. Of particular note is the fact that, as a kind of energy accumulator, crane devices are a source of increased danger, which is also due to the need to know the basis of their calculation and the constant improvement in the accuracy of these calculations.

Car cranes are the most common self-propelled lifting machines. Due to their mobility and autonomy, they allow you to mechanize any construction, installation and loading and unloading work at several facilities, even if they are far from each other, without requiring the help of other machines, energy sources and vehicles.

Along with the increase in the production of car cranes, their design is changing. If at the first stages machines with a mechanical drive were created, now cranes with electric or hydraulic drives of working mechanisms are put into operation.

Any design is based on maximizing the use of existing structures, improving them and improving them. In this work, an automobile boom crane with a flexible boom suspension and an electric drive of mechanisms with a lifting capacity of 5 tons is designed.