Suspension conveyor drive - machine parts

Contents

Terms of Reference

Introduction

1 Kinematic diagram of machine unit

2 Motor selection, kinematic calculation of drive

3 Selection of gear materials and definition

allowable stresses

4 Calculation of closed cylindrical transmission

5 Calculation of open conical transmission

6 Loads of gear box shafts

7 Design calculation of shafts

Gearbox shaft design diagram

9 Check calculation of bearings

10 Structural arrangement of the drive

11 Verification calculations

Gearbox technical level calculation

Gearbox assembly

Conclusion

Literature

Introduction

A course project on machine parts is the first design documentation work, as a result of which the student acquires skills and knowledge of design rules, norms and methods. The implementation of the project is based on knowledge of physical, mathematical and general technical disciplines: mathematics, mechanics, material resistance, metal technology, mechanical engineering, etc.

When designing a machine, two main tasks must be solved simultaneously: 1. Creation of a machine that fully meets operational requirements. 2. Creation of the machine that is most economical to manufacture and operate.

Kinematic diagram of machine unit

Machine unit operating conditions

Designed machine unit serves as drive of suspended conveyor. Drive consists of electric motor whose shaft is connected through elastic clutch with sprocket to drive shaft of cylindrical helical reduction gear with lower arrangement of gear. Bevel gear of open gear train with vertical driven shaft is fitted on driven shaft of reduction gear, which drives traction chain of conveyor.

Gearbox assembly

Prior to assembly, inner cavity of reducer housing is thoroughly cleaned and covered with oil-resistant paint. Assembly is carried out in accordance with the assembly drawing of the reduction gear box, starting from the shaft assemblies: bearings pre-heated in oil to 80100 ° C are put on the drive shaft; a key is put into the driven shaft and the gear wheel is pressed until stop against the shaft collar; Then spacer bushing is put on and bearings pre-heated in oil are installed. The assembled shafts are laid in the base of the reduction gear case and put on the cover of the case, covering the surfaces of the joint of the cover and the case with alcohol varnish. For alignment, a cover is installed on the body using two conical pins; bolts that attach the cover to the housing are tightened. After that, a spacer ring is put on the driven shaft, plastic grease is put into bearing chambers, put

bearing covers with set of metal gaskets for adjustment. Prior to installation of through covers, cuff seals are put into grooves. By turning the shafts there is no jamming of bearings (the shafts must be rotated by hand) and the covers are fixed with screws. Then plug of oil discharge hole with gasket and iron oil indicator are screwed in. Gear engagement is adjusted along contact spot by changing thickness of gaskets under bearing covers.

Oil is poured into housing and inspection hole is closed with cover with gasket made of technical cardboard; cover is bolted. The assembled gearbox is rolled and tested on the bench according to the program set by the specifications.

Conclusion

The completed course project contains the solution of problems reflecting the mastery of all topics of the discipline "Machine Details."

Detailed studies of the operating conditions of the designed unit have been carried out in order to select rational materials and the technology for processing its most important parts.

Calculation of cylindrical closed and conical open gears, gearbox shafts was made on the basis of strength characteristics of materials of these parts.

General engineering skills extended and supplemented during the course project process include the following sections of calculation and design of machine parts:

- selection of electric drive of suitable power;

- selection of gear ratios of drive stages;

- calculation of gearing strength characteristics;

- calculation of parameters of reliability and durability of open transmission;

- selection of bearings and coupling with rational parameters.