Belt conveyor drive design - coursework

Contents

INTRODUCTION

1 KINEMATIC AND POWER CALCULATION OF DRIVE

2. CALCULATION OF GEARS

2.1. CALCULATION OF CYLINDRICAL HELICAL GEAR

2.2. CALCULATION OF CYLINDRICAL HELICAL GEAR

3. SHAFT CALCULATION AND DESIGN

4. CALCULATION OF KEY CONNECTIONS

5. CALCULATION AND DESIGN OF BEARING ASSEMBLIES

6. DESIGN OF BODY PARTS, MACHINES AND COVERS

7. LUBRICATION OF ENGAGEMENT

8. MOUNTING FRAMES AND PLATES, ATTACHMENT TO FLOOR

9. SELECTION OF COUPLINGS

10. SELECTION OF FITS

11. GEARBOX ASSEMBLY AND ADJUSTMENT

12.SAFE TECHNICS

LIST OF LITERATURE USED

Introduction

The purposes and objectives of this design are to study the basis of calculation and design of parts and assembly units taking into account rational selection of materials, manufacturing technology and operation of the machine. Designed machines should have the highest performance (productivity, efficiency), low energy consumption and operational materials at the lowest weight and dimensions: high reliability: be economical both during production and during operation, be convenient and safe to maintain: allow automation of the machine, standardization of parts and assemblies. Mechanical engineering is of great importance in the economy, since all other industries and agriculture are developing on the basis of mechanical engineering.

The main requirements for the machine are: high performance, reliability, processability, minimum dimensions and weight, ease of use, economy and technical aesthetics.

A project is a set of technical documents related to a product intended for manufacture or modernization and containing drawings, calculations, description, etc.

A reduction gear is a mechanism consisting of gear or worm gears enclosed in a separate closed housing and operating in an oil bath.

Mounting frames and slabs, attachment to floor

When installing drives, certain requirements of accuracy of position of one assembly unit relative to another, for example, electric motor and reduction gear box, must be observed.

To meet this requirement, drive mechanisms are installed on welded frames or cast plates.

Frames are welded from sheet steel and shaped rolled stock (angles, channels).

When making welded frames from channels, it is taken into account that for the convenience of bolting, these channels must be installed with shelves outside. Oblique washers are applied to the inner surface of the shelf or oblique patches are welded, which align the support surface under the bolt heads.

Support surfaces - plates, on which reduction gears and electric motors are installed, are created by welding narrow strips of steel with a height of 5... 6 mm.

Since the frame is warped during welding, all the base (support) surfaces on which the drive mechanisms are installed are processed after welding.

Cast slabs are more expensive than welded frames, because they are less common.

Assembly units are bolted to the plate.

The configuration and dimensions of the frame depend on the type and dimensions of the gearbox and the e.

The distance between them depends on the selected coupling.

Frame is fixed to floor of shop by foundation bolts.

Gearbox assembly

Prior to assembly, inner cavity of reducer housing is thoroughly cleaned and covered with oil paint.

Assembly is performed in accordance with gearbox assembly drawing starting from shaft assemblies.

Oil retaining rings and ball bearings pre-heated in oil to 80... 100 0C are put on the driving shaft.

Keys are put on driven and intermediate shafts and gear wheel is pressed until stop against shaft collar, then spacer bushing, retaining rings are put on and ball bearings, previously heated in oil, are installed. The assembled shafts are laid in the base of the reduction gear case and the cover of the case is put on, having previously covered the surface of the joint of the cover and the case with alcohol varnish. For alignment, the cover is installed on the housing with the help of two conical pins, bolts are tightened, which attach the cover to the housing. After that, spacer rings are put on the driven shaft, solidol is put into bearing chambers of the cover, bearing covers with a set of metal gaskets for adjustment are placed.

Prior to installation of through covers felt seals impregnated with hot oil are laid in grooves.

Then the shafts turn, there is no clamping of bearings (the shafts must be rotated by hand) and attach the covers with screws. Then plug is screwed in oil of drain hole with gasket and oil indicator is installed.

Oil is poured into the housing and the inspection hole is closed with a cover with a gasket made of technical cardboard, the cover is bolted .

The assembled gearbox is rolled and tested on the bench according to the program established by the operating specification.