Process Machine Drive Design

Contents

INTRODUCTION

1 DESIGN BASIS

2 SELECTION OF ELECTRIC MOTOR AND CALCULATION OF ITS PARAMETERS

3 CALCULATION OF V-BELT TRANSMISSION

3.1 Verification calculation

4 DEVELOPMENT OF V-BELT DRIVE PULLEY

5 GEARBOX CLOSED GEAR

5.1 Verification calculation

6 CALCULATION OF SHAFTS OF CLOSED GEAR TRAIN

6.1 Drive shaft

6.2 Slow-moving shaft

7 BEARING SELECTION

8 CHOICE OF OIL GRADE

CONCLUSION

LIST OF LITERATURE USED

Introduction

Understanding Design and Design

The creation of machines that meet the needs of the national economy should provide for their greatest economic effect and high tactical, technical and analytical indicators .

The main requirements for the machine are high productivity, reliability, processability, repairability, minimum dimensions and weight, ease of operation, economy, and technical aesthetics. All these requirements are taken into account in the design and design process.

Design is the development of a common product design.

Design is a further detailed development of all issues related to the implementation of the schematic diagram into a real design.

A project is a technical document derived from design and design. Technical documentation is divided into initial, design, working.

The initial documentation includes a technical assignment (Toz Code, GOST 15.001 - 73), which establishes general information about the purpose of the created product, the operational requirements for it and its main characteristics: geometric, power, kinematic. The terms of reference regulate the stages of development of design documentation and the deadlines for performance of work stages (see Table 0.1).

GOST 2.103 - 68 establishes the stages of development of design and working design documentation for products of all industries with assignment of letters of the corresponding stage to documents: technical proposal (letter p); sketched design (letter e); technical design (letter t); working documentation (letters and - for one-time production of one or several articles). It also regulates the stages of work at stages .

The technical proposal (GOST 2.118-73) contains a feasibility study for the feasibility of developing the product and clarifies the requirements for the product obtained based on the analysis of the technical specification and the development of options for possible technical solutions of the product taking into account its design and operational features .

Draft design (GOST 2.119 - 73) - a set of design documents that should contain fundamental design solutions that give general ideas about the device and the principle of operation of the product, as well as data that determine its main parameters and overall dimensions. A draft design is usually developed in several (or one) versions and is accompanied by a detailed calculation analysis, as a result of which an option is selected for further development in the technical design .

The technical design (GOST 2.120 - 73) covers detailed design development of all elements of the optimal design version with the introduction of the necessary amendments and changes recommended during the approval of the draft design. Design documentation of the technical design contains final technical solutions on the structural structure of the product and initial data for the development of detailed documentation .

Working documentation (working design) - the final stage of designing the design documentation necessary for the manufacture of all abnormal parts (part drawings, assembly drawings, specifications).

Types of products

GOST 2.101 - 68 defines the product as any item or set of production items to be manufactured at the enterprise. The following product types are installed: part; assembly units; complexes; kits (parts and assemblies are considered during course design ).

A part is a product made of a uniform material by name and brand, without the use of assembly operations (for example, a shaft, a gear wheel, a cast body, etc.).

An assembly unit is a product whose components are to be connected to each other at the manufacturer by assembly operations (for example, a car, a machine, a reduction gear, etc., or an electromechanical drive to the machine, to the winch, etc.).

The articles, depending on the presence or absence of components in them, are divided into: unspecified (parts) - without components; specified (assembly units) - consisting of two or more parts.

Gearbox Design Assignment and Selection

A reduction gear is a mechanism made in the form of an independent unit in order to reduce the rotation speed of the driven shaft and increase the torque on the driven shaft. Reduction gear consists of gear or worm wheels, shafts, bearings, bearing covers, housing, etc.

Gearboxes are widely used in drives of various working machines in different branches of machine building. The gear box is connected to the engine using a coupling or belt and chain gears. Gearboxes are classified according to types, sizes and versions.

The type of reduction gear is determined by the type of gearing used and the order of their placement in the direction from the high-speed shaft to the slow-speed shaft, by the number of gearing stages and by the location of the geometric axis of the slow-speed shaft in space.

Reducers are cylindrical, conic, konichesko - cylindrical, worm, chervyachno cylindrical, tsilindrichesko - worm, planetary, wave, etc.

According to the number of gearboxes, one-stage, two-stage, three-stage gearboxes are distinguished.

According to the location of the geometric axis of the slow-moving shaft in space, reduction gears are distinguished: horizontal and vertical.

The gearbox size determines the type and main size of the slow-moving stage for cylindrical and worm gears, the main parameter is the axial distance, conical - the outer dividing diameter. Other parameters of gear reduction gears are gear wheel width factor, gear wheel modules, teeth inclination angles, and worm gear gears additionally have worm diameter factor.

Design of reduction gear determines gear ratio, version of assembly, shape of end sections of shafts. The main energy characteristic of the reduction gear is the nominal torque on the slow-moving shaft.

Cylindrical reduction gears are used to transfer motion between shafts whose axes are parallel.

The most common are vertical and horizontal cylindrical reduction gears with straight and chevron teeth.

The maximum gear ratio of a single-stage cylindrical reduction gear box according to GOST is 12.5. The height of a single-stage reduction gear with the same or close to it gear ratio is greater than a two-stage reduction gear with the same value. Therefore, practically gearboxes with a gear ratio close to the maximum are rarely used, limited to 6.

Conclusion

As a result of the course project, the skills of designing parts of machines and mechanisms were obtained. As a result of the design of the project, skills have been acquired to work with regulatory and technical documentation, various engineering, educational and reference literature (such as atlas, catalogs and ESKD Classifier.

When designing a cylindrical single-stage reduction gear, analytical and practical thinking was developed, as many mathematical calculations were made.

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