Calculations of normalized and standard assembly units of tower cranes

Contents

Introduction

1. Calculation of cargo lifting mechanism

1.1 Selection of polyspast scheme

1.2 Determination of pulling force of polyspast in rope

1.3 Selection of flexible element (rope)

1.4 Determining the main dimensions of the drum

1.5 Drum Strength Test

1.6 Calculation of rope attachment on the drum

1.7 Calculation of cargo suspension

1.7.1 Selection of the unit bearing by dynamic operability factor

1.7.2 Calculation of unit axis

1.7.3 Hook selection and calculation of hook nut

1.7.4 Selection of bearing for hook nut

1.7.5 Traverse calculation

1.7.6 Calculation of cheek

1.8 Determination of power and selection of electric motor

1.8.1 Engine check by starting torque

1.9 Gearbox selection

1.10 Selection of coupling with brake pulley

1.11 Brake selection

2 Calculation of boom departure change mechanism (movement of trolley with cable rod)

2.1 Selection of running wheel

2.2 Determination of total drag force of trolley movement

2.3 Determination of thrust force

2.4 Selection of traction rope size

2.5 Determination of design diameter of drum

2.6 Power Determination Motor Selection

2.7 Selection of standard elements

2.7.1 Gearbox selection

2.7.2 Coupling Selection

2.7.3 Selection of brake size

Conclusion

Bibliographic list

Application

Terms of Reference for the Course Project

Introduction

Course design for lifting machines (GPM)

promotes the generalization and consolidation of theoretical knowledge of students and instills in them the skills of independently solving engineering problems when developing structures of assembly units and machines.

When performing a course project on GPM, the student uses GOST, reference literature, studies and applies modern machine designs and the best achievements in the field of domestic and foreign engineering. The skills of drawing, calculating and drafting text design documents are further developed.

The objects of design are lifting machines.

The main tasks of the student are: the calculation of the main crane mechanisms, the choice on the basis of these calculations of normalized and standard assembly units, their rational layout. The mechanisms should be developed taking into account their placement on the metal structures of the crane. The mechanisms must meet the requirements of reliability, ease of installation and dismantling, maintenance, safety. All calculations must be carried out in accordance with the requirements of the rules of Rostekhnadzor of Russia.

Conclusion

During this course design, the main crane mechanisms were calculated, a choice was made based on these calculations of normalized and standard assembly units, their rational layout. All mechanisms meet the requirements of reliability, convenience of installation and dismantling, maintenance, safety. All calculations were performed in compliance with the requirements of Rostekhnadzor of Russia.