Calculation of the tumbling drum drive

Contents

Introduction

1. Selection of unit diagram and kinematic calculation

2. Calculation of V-belt transmission

3. Select gear materials. Define Allowable Stresses

4. Calculation of closed cylindrical gear train

5. Determination of loads on gearbox shafts

6. Design calculation of shafts

7. Pre-selection of rolling bearings

8. Design diagram of gear box shafts

9. Check calculation of bearings

10. Design of drive transmission elements

11. Oil selection and lubrication method

12. Selecting Fits and Surface Roughness

13. Coupling selection

14. Chassis Design and Gearbox Layout

15. Calculation of key connections

16. Frame Design

17. Brief description of the assembly, operation and maintenance of the drive

18. Safety precautions

17. Conclusion

List of used literature

Introduction.

It is commonly called a reduction gear, a mechanism consisting of gear or worm gears made in the form of a separate unit and serving to transfer power from the engine to the working machine. The reduction gear consists of a housing in which the transmission elements are placed - gears, shafts and bearings, etc. The reduction gears serve as mechanisms for lowering the angular velocity and, accordingly, increasing the torque; however, mechanisms for increasing angular velocity, made in the form of separate units (accelerators or multipliers), are also sometimes called reducers.

Gearboxes are classified according to the following main characteristics:

- transmission type (toothed, worm, gear-worm);

- number of stages (single-stage, two-stage, etc.);

- type of cogwheels (cylindrical, conic, konicheskotsilindrichesky);

- relative location of gear box shafts in space (horizontal, vertical, etc.);

- peculiarities of kinematic scheme (unfolded, coaxial, with bifurcated stage, etc.).

Gears can have wheels with straight, oblique or chevron teeth. Casings are most often cast from cast iron, less often used welded, sheet steel. Shafts can be mounted both on rolling bearings and on sliding bearings (usually used in heavy gearboxes).

Task.

Calculate and design the drive of the tumbling drum, including: electric motor; vertical kinematic transmission; two-stage cylindrical spur reduction gear with two planes of the connector with the upper driving and lower driven shaft; elastic coupling with toroidal shell. Operating mode - two-shift, typical loading mode - heavy.

17. Brief description of the assembly, operation and maintenance of the drive.

The assembly order of the actuator is described in the assembly drawings. First, a reduction gear is installed on the frame. We put couplings on the reduction gear, after that we install an electric motor. After installation of electric motor and reduction gear box on high-speed shaft of reduction gear box we install driven pulley of belt transmission. Then we put on the belt and tighten the belt by shifting the engine along the vertical axis. Tighten the engine attachment bolts. After installation of all elements of the drive, the oil level in the reduction gear box is checked.

Conclusion.

In this course work, I mastered the main requirements for the machine being created: high productivity, reliability, technicality, repairability, minimum dimensions and weight, ease of operation, economy, technical aesthetics. All these requirements are taken into account in the design and design process. Also in this project, the first engineering skills were acquired in the calculation and design of typical gearboxes and machine assemblies and mechanisms based on the obtained theoretical knowledge.