Calculation and design of overhead conveyor drive station

Contents

Introduction

1 Selection of electric motor. Kinematic calculation of the drive

2 Calculation of open transmission

3 Calculation of closed gear train

4 Preliminary calculation of gear box shafts and selection of bearings

5 Gear and Wheel Design Dimensions

6 Gearbox housing structural dimensions

7 First stage of gearbox arrangement

8 Serviceability check of bearings

9 Second stage of gearbox arrangement

10 Test of key joints strength

11 Refined shaft calculation

12 Selection of fits for main parts of reduction gear box

13 Reduction gear box lubrication

14 Gearbox assembly and adjustment

List of information sources

Introduction

The course project on the discipline "Applied Mechanics" is designed to help consolidate, deepen and generalize the knowledge gained by students during the study of this discipline and apply this knowledge to the integrated solution of engineering problems in the design of parts, assemblies and the machine as a whole.

Course design in the discipline "Applied Mechanics" is a design work in which knowledge in many technical subjects is applied. This project should contribute to the development of creative initiative and prepare students for solving various production problems. In the process of working on the project, students gain skills in analyzing existing structures taking into account their advantages, disadvantages, determining ways to eliminate them using reference literature, guests, tables, etc.; To consolidate the rules for the design of the explanatory note and the graphic design of their design decisions.

Definition of cantilever forces

In the designed drive, an open belt gear is designed to determine the cantilever load on the output end of the shaft.

Determine the direction of the cantilever forces at the output ends of the shafts [1, p. 108].

Cantilever force from belt transmission Fop is perpendicular to shaft axis and is directed horizontally in compliance with transmission position in kinematic circuit of drive.

The value of the cantilever force from the belt transmission Fop was determined earlier in the design calculation of the open transmission, Fop = 236.7 N.

Gearbox assembly and adjustment

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: holding rings, roller bearings 7206A, preheated in oil up to 80100 ° C are put on the driving shaft; a key 8x12x32 is put into the driven shaft and the gear wheel is pressed to rest against the shaft collar; Then spacer bushing, containment rings are put on and roller bearings 7207A, pre-heated in oil, then sleeves of bearing units are put on.

The assembled shafts are laid in the base of the reduction gear case and put on the cover of the case, covering previously the surfaces of the joint of the cover and the case with sealant. For alignment, a cover is installed on the body using two pins; bolts with diameter M12 are tightened, which attach the cover to the housing.

Rubber reinforced cuffs are laid in grooves before installation of through covers. By turning the shafts do not lock the bearings (the shafts must be rotated by hand) and attach the covers with M8 bolts.

A key 6x6x18 is then inserted into the key groove at the end of the drive shaft and connected to the load chain through a sprocket.

After that key 7x8x28 is put into key groove on the end of driven shaft, pulley of V-belt transmission is installed and fixed with end attachment. Then plug of oil discharge hole with gasket and iron oil indicator are screwed in. 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 fixed with bolts M8.