Course project Crusher complex 250-400

Contents

CONTENTS

INTRODUCTION

1 Design part

1.1 Prototype Selection

1.2 Determination of basic parameters of jaw crusher

1.3 Performance Calculation

1.4 Determination of drive power

1.5 Kinematic calculation

1.6 Calculation of strength of parts of jaw crusher

1.6.1 Strength calculation of spacer plate

1.6.2 Base strength calculation

1.6.4 Calculation for strength of movable cheek

2 Economic part

2.1 Determination of Operational Capacity

2.2 Definition of specific capital investments

2.3 Determination of specific consumption of energy resources

2.4 Determination of machine shift cost

2.5 Determination of cost of production

Occupational and environmental protection

CONCLUSION

LIST OF SOURCES USED

APPLICATION

Introduction

The jaw crusher is a universal material crushing machine. It is used on rocks of any strength, on slags, some metal materials. Application is not possible on viscoelastic materials such as wood, polymers, certain metal alloys. The input size reaches 1500 mm. The size of the finished product for small crushers is up to 10 mm. Cheek crushers are available in all crushing classes: large, medium and small.

Together with millstones and mortar, the cheek crusher is one of the oldest structures for destroying large pieces. An industrial cheek crusher was made in the middle of the 19th century in the USA, at the same time its mass introduction began and the replacement of heavy manual labor practiced everywhere before. The impetus for the development of cheek crushers was an important feature of the crushing process - its cost. It is no secret that crushing is one of the most expensive enrichment processes in terms of the amount of energy consumed, the cost of repair, the replacement of rapidly wearing crushing parts, as well as the original cost of the process equipment itself, which requires the use of high-quality metals. On average, the cost of crushing equipment is about 5060% of the cost of all equipment, and the cost of crushing reaches 4045% of all operating costs. In this regard, the designers of the XIX century directed their efforts to develop an optimal crushing mechanism that would reduce the costs of the crushing process.

The principle of operation of the jaw crusher is based on compression of the working surfaces (cheeks) of the material, which leads to the emergence of high compression and shear stresses that destroy the material. The figure shows how the jaw crusher works. One of the crusher cheeks is made stationary. The second cheek is fixed on the connecting rod providing movement of the upper edge of the cheek so that the cheek makes a swinging movement. The shaft of the connecting rod is driven through V-belt transmission from the engine (electric, diesel). On the same shaft, a second pulley is attached, which plays the role of a flywheel and a counterweight for the main pulley. The lower edge of the movable jaw has the possibility of adjusting the position in the horizontal direction (mechanical drive or hydraulic drive), which affects the width of the minimum slot, which determines the maximum size of the material at the outlet of the crusher. The cheeks form a wedge-like shape of the crushing chamber, in which the material, under the influence of gravity and after destruction, moves from the upper part, into which large pieces are loaded, to the exit (unloading) slot. Side walls do not participate in the crushing process. Now cheek crushers of simple and complex rolling of the cheek are used. In the latter crushers, a higher degree of load on the material (high shear stresses) is achieved. One of the relatively recent innovations is vibrating crushers, which should be used on very durable materials.