Belt Conveyor Design in Course Project

Contents

Introduction

I. KINEMATIC CALCULATION OF THE DRIVE

II. CALCULATION OF LOW-SPEED STAGE OF REDUCTION GEARBOX

III. GEARBOX HIGH SPEED STAGE CALCULATION

IV. DEVELOPMENT OF DRAFT DESIGN

V. LUBRICATION AND LUBRICATION SYSTEM SELECTION

List of sources used

Introduction

Mechanical engineering has a leading role among other sectors of the economy, since machines perform the main production processes. Therefore, the technical level of many industries of many industries largely determines the level of development of engineering.

Improving operational and quality indicators, reducing the time of development and implementation of new machines, improving their reliability and durability are the main tasks of machine builders. One of the areas of solving these problems is improving the design training of students of higher technical educational institutions.

The implementation of this course project completes the general technical cycle of student training. This is our first independent creative engineering work, during which we actively use knowledge from a number of disciplines passed: material resistance, metal technology, interchangeability, etc.

The objects of course design are usually drives of various machines and mechanisms (for example, belt and chain conveyors, individual, test stands), using most parts and assemblies of general engineering applications. Engineering is a creative task. It is known that each design problem has several solutions. It is important to compare competing options according to certain criteria and choose one of them - optimal for these specific conditions.

Design recommendations are accompanied by an analysis of the working conditions, machining, and assembly of subassemblies and parts. When performing a course project, we must successively go from choosing a mechanism scheme through the multivariability of design solutions to its implementation in detailed drawings; getting involved in engineering creativity, learning from previous experience, learns to anticipate new ideas in the creation of machines that are reliable and durable, economical to manufacture and operate, convenient and safe to maintain.

The purpose of the work is to design the drive to the belt conveyor.

Conveyor is intended for transportation of dry loose materials. Drive consists of electric motor and worm two-stage reduction gear. The drive also includes couplings, a drum and a conveyor belt. Electric motor and reduction gear are installed on common welded frame.

Vii Selection of lubricants and lubrication system

In order to reduce friction power losses, reduce the wear rate of friction surfaces, their cooling and cleaning from wear products, as well as to prevent jamming, corrosion, reliable lubrication of friction surfaces must be provided.

Most often, the gearboxes use a carriage lubrication system in which the housing is an oil tank. Oil is poured into reduction gear case through upper hatch. It is poured so that the wheel is immersed in it. When rotating, the wheel attracts oil, spraying it inside the body. During the operation of the transmission, the oil is gradually contaminated with wear products, it ages - its properties deteriorate. Therefore, the oil is periodically changed. To drain oil in the housing, a drain hole is made, which is closed by a plug with a conical thread.

Oil grade is assigned depending on contact voltage and circumferential speed. Therefore, the required viscosity for worm gears at 100C is 22 mm2/s, therefore, the oil grade I-G-S-320 (AND - industrial, G - for hydraulic systems, C - oil with anti-oxidizing, anti-corrosion and anti-wear additives).

The depth of the worm immersion in the oil bath is hM ≈ 2 ∙ m.. 0.25 ∙ d2 = 2 ∙ 4.. 0.25 ∙ 148 = 8.. 37 mm, where m = 4 mm is the engagement module, d2 = 148 mm is the dividing diameter of the worm wheel.

Ix Frame Design

When installing drives consisting of an electric motor and a reduction gear box, certain requirements for the accuracy of the relative position of the units must be met. For this purpose drive units are installed on the base. As a base for single production, it is more profitable to use welded frames welded from elements of high-grade rolled stock: channels, corners, strips and sheets.

Frame height H = (0.08.. 0.1) ∙ L = (0.08.. 0.1) ∙ 570 = 45.. 57 mm,

where L = 570 mm is the approximate length of the frame.

For design reasons, we use channel No. 14 according to GOST 824089. Channel dimensions: height h = 140 mm, shelf width b = 58 mm, wall thickness S = 4.9 mm.

We place the electric motor and gearbox on the base surfaces - plates, the thickness of which is 5 mm.

Since the frame is strongly warped during welding, all base surfaces after welding are straightened.

To attach the frame to the floor, foundation bolts with a diameter of 22 mm in the amount of 8 pieces are used.