Calculation of belt conveyor drive and development of tapered spur gear

Contents

Contents

Introduction

1. Kinematic calculation of belt conveyor drive

1.1 Electric motor selection and check

1.2 Determination of total gear ratio and its breakdown between stages. 1.3 Determination of rotation speeds of drive shafts

1.4 Determination of angular speeds of rotation of drive shafts

1.5 Determination of power on drive shafts

1.6 Determination of torque on drive shafts

2. Calculation of closed conical transmission

2.1 Initial data for calculation

2.2 Selection of gearwheel materials and determination of permissible stresses

2.3 Determining the main transmission parameters

2.4 Transmission check calculations

2.5 Forces Engaged

3. Calculation of open V-belt transmission

3.1 Initial data

3.2Selection of belt section

4. Design calculation of shafts and dimensions of gearbox main parts.

4.1 Design calculation of gear box shafts

4.2 Selection of rolling bearings for gear box shafts

4.3 Main dimensions of sleeve of high-speed shaft bearing assembly and bearing covers

4.4 Selection of collars to be inserted into through bearing covers grooves

4.5 Basic Dimensions of Bevel Gear

4.6 Main structural dimensions of the gearbox housing

5. Test calculation of key connections

6. Coupling selection and check calculation

7. Grease Selection

8. Gearbox assembly

List of sources used

Attachments A - Layout Drawing

Appendix B - Computer Shaft and Bearing Calculations Printouts

Appendix B - Specification

Summary

The explanatory note contains 39 pages, including 1 table , 5 sources , 3 annexes. The graphic part is made on 1 sheet of A0 format, 2 sheets of A3 format and 1 sheet of A1 format.

This design describes the calculation of the belt conveyor drive and developed a conical spur gear. 

The development includes:

gearbox assembly drawing;

working drawings of 2 parts (shaft, gear wheel).

Introduction 

 The technical level of all branches of the national economy is largely determined by the level of development of mechanical engineering. Based on the development of mechanical engineering, complex mechanization and automation of production processes is carried out in industry, construction, agriculture, and transport.

The state has set the task of engineering to significantly increase the operational and quality indicators with a continuous increase in its output.

One of the ways of solving this problem is to improve

 design training of students of higher educational institutions.

The object of this course project is the belt conveyor drive. 

The drive consists of:

electric motor;

belt transmission;

conical spur gear box;

 couplings;

working shaft.

Gearbox Assembly Order

Prior to assembly, inner cavity of housing is thoroughly cleaned and covered with oil-resistant paint. Gearbox is assembled in accordance with gearbox assembly drawing.

 The assembly is started by putting the holding ring on the drive shaft until it rests against the shaft collar, the roller conical radial thrust bearing No. 7212A GOST2736587 is inserted into the sleeve and the spacer bushing and the second bearing No. 7212A are inserted (the bearings are preheated in oil to 801000C). The bearing assembly is tightened with a splined nut M56 × 2 GOST11871. Assembled assembly of shaft is inserted into socket located in cover of reduction gear box housing. 

At the beginning of low-speed shaft assembly key is laid and gear wheel is pressed until stop against shaft collar; Then spacer bushing, retaining rings are put on and roller conical radial-thrust bearings No. 7212A GOST2736587 heated in oil are installed. Assembled shaft is laid in base of body and cover of body is put on.

 The joint surfaces are pre-coated with a thin layer of sealing compound UT34 GOST21285. For alignment, the cover is mounted on the housing by means of two cylindrical pins; bolts are tightened, which attach the cover to the housing base.

For normal operation of bearings, it should be ensured that, on the one hand, the rotation of the movable bearing members is easy and free and, on the other hand, that there are no excessively large gaps in the bearings. Compliance with these requirements, i.e. the creation of an optimal amount of clearances in bearings, is carried out by adjusting the bearings, for which a set of thin metal gaskets are used, which are installed under the flanges of the bearing covers. The required thickness of the set of gaskets can be composed of thin metal rings 0.1 thick; 0,2; 0,4; 0.8 mm. 

For adjustment of axial position of bevel gear it is possible to move during assembly of gear sleeve. This movement is also provided by a set of thin metal gaskets which are mounted under the sleeve flanges. Therefore, the seat of the cup is carried out, as a rule, along the seat with a gap.

 Rubber cuffs are put into through bearing covers and covers of bearing units with gaskets are installed. By turning the shafts there is no jamming of bearings (the shafts must be rotated by hand) and the covers are fixed with screws.

Oil outlet plug with gasket and iron oil indicator are screwed in. Oil is poured into reducer 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 .