Study of single stage compressor mechanism

Contents

CONTENTS

INTRODUCTION

1. STRUCTURAL ANALYSIS OF THE MECHANISM

2. KINEMATIC EXAMINATION OF THE MECHANISM

  2.1. Drawing up a plan for the provisions of the mechanism

  2.2. Building Speed Plans

  2.3. Build acceleration plans

  2.4. Create kinematic diagrams for point B

3. KINETOSTATIC EXAMINATION OF ENGINE MECHANISM. STUDY OF MOVEMENT OF THE MECHANISM

3.1. Determination of forces and moments of forces acting on the links of the mechanism

3.2. Power calculation of the group of links 4 and

3.3. Power calculation of the group of links 2 and

3.4. Power calculation of initial link

3.5. Determination of balancing force according to the method of N.E. Zhukovsky

3.6. Determination of instantaneous mechanical efficiency      

mechanism actions

3.7. Investigation of mechanism motion and determination   of moment of inertia

flywheel

3.8 Determination of the given moment of inertia of the mechanism

4. DESIGN OF CAM MECHANISM

4.1Development of rocker motion diagrams

4.2. To Create a Cam Profile of a Rocker Cam

mechanism

4.2.1 Determination of minimum radius of cam rmin

and  axial distance in the rocker cam mechanism

To Create a Cam Profile for a Rocker Cam

5. DESIGN OF INVOLUTE ENGAGEMENT OF SPUR WHEELS

GEAR DESIGN

 Analytical method

  6.2 Graphical method

CONCLUSION

Literature

Project Description

The course project includes 3 sheets of the graphic part of A1 format and 45 sheets of the explanatory note of A4 format. The explanatory note contains 6 tables and 3 figures. In carrying out this course project, 9 literary sources were used.

Keywords: mechanism; machine; structural group; kinematic pair; link; Speed plan; acceleration plan; strength.

The purpose of the course project is to acquire practical skills in kinematic analysis and synthesis of flat lever, lever, cam and gear mechanisms.

Research methods: analytical, graphic and graphoanalytic.

In this design, structural kinematic and dynamic characteristics of the lever mechanism are determined, cam and gear mechanisms are projected according to specified conditions.

Introduction

At this time, a strategy has been defined to accelerate the socio-economic development of our country for the long term. It is planned to accept and raise productive forces and production relations to a high-quality stage, to accelerate scientific and technological progress. At an accelerated pace, it is necessary to develop mechanical engineering, which is a key industry that determines the pace of technical re-equipment of all sectors of the national economy.

It is possible to solve such important economic tasks to increase the efficiency and quality of products by accurately designing the mechanism.

The goal of the course project is to consolidate the theoretical material and knowledge obtained during the study of the course, practical knowledge, skills in calculating mechanisms and machines used in transport, automotive and c/c engineering, as well as using reference data and materials of standard terminology. The course project consists of three sheets covering the main sections of the theoretical course.

The course project is carried out on an individual task. The mission of the course project provides for the study of a machine unit, which consists of a motor, a transmission gear mechanism, a working machine, and a cam control mechanism.

Design of cam mechanism

The widespread use of cam mechanisms is due to the fact that they easily reproduce the given law of motion of the driven link.

It should be borne in mind that when choosing the law of movement of the slave link, impacts in the cam mechanism may occur. The following groups of laws of movement are distinguished: with hard blows, with soft blows, without blows. Hard impacts in the cam mechanism occur when the pusher is lifted or lowered at a constant speed. With a sinusoidal law, movement occurs without hard and soft impacts (this law is recommended when designing high-speed cam mechanisms).

For the synthesis (design) of the cam mechanism, the following are specified: mechanism diagram; Maximum linear h or angular movement of the slave link; phase angles of rotation of a cam (removals - ϕу, distant standing ϕд. page, returns ϕв); Exit laws for the removal and return phase length of rocker arm l for rocker cam mechanisms. Based on the conditions of limiting the pressure angle, the main dimensions of the links of the cam mechanism are determined; minimum radius of cam, position of rocker relative to center of cam rotation, cam profile is designed by graphical or analytical methods.

Conclusion

During the course project, the skills of research and design of mechanisms and machines, use of reference literature were obtained.

During execution of the first sheet structural and kinematic analysis of the mechanism is performed.

When making the second sheet, reactions in kinematic pairs, equilibrium force = 8600.6 N, instantaneous efficiency of the mechanism, moment of inertia = 0.88 kg * m2, flywheel weight = 32.5 kg are determined, the flywheel masses of the mechanism are calculated according to the given coefficient of unevenness of motion.

During the execution of the third sheet, the following tasks were completed:

- calculation of gearing geometrical dimensions;

- determination of the coefficient of overlap of specific slips;

- estimation of projected transmission by geometric readings;

- determining the basic dimensions and geometry of the cam profile, ensuring reproduction of the required law of motion of the pusher.