Chain Conveyor Drive - Machine Parts

Introduction

The purpose of this course project is to design the belt conveyor drive on the basis of a comprehensive specification. Drive includes electric motor, open belt gear, conical cylindrical reduction gear, gear-friction clutch, drive sprockets. Within the framework of this course design, calculation and selection of the required electric motor, design calculation of the gearbox on the computer, check calculation of the gearbox, calculation of the low-speed shaft of the gearbox for fatigue strength, calculation of bearings on this shaft for dynamic lifting capacity, calculation of the strength of the veneer joints, calculation of the friction coupling are carried out.

Design calculation of closed gears per computer

2.1 Preparation of initial data for design calculation

The material of the gears should provide for closed gears - high resistance to painting of surface layers of teeth. Thermally treated carbonaceous and alloyed steels meet these requirements.

The load capacity of gear gears is simulated by contact strength.

The greatest hardness of the teeth H = 53...... 63 HRC is ensured by chemical-thermal hardening: surface saturation with carbon or nitrogen and subsequent quenching.

For TP, cementation (surface saturation of teeth with carbon, followed by hardening and low tempering) should be carried out. Nitriding (surface saturation of teeth with nitrogen). Surface hardening of HPV.

For TP: Surface hardening of TVH.

Gear - Steel 40X (GOST 454371), H1 = 52 HRC.

Wheel - Steel 45 (GOST 105088), H2 = 52 HRC.

Selection of bearings and keys

5.1 Selection of high-speed shaft bearings and keys

Select roller tapered bearings. The design of single-row conical roller bearings makes them especially suitable for receiving combined, both radial and axial loads. Conical roller bearings have a detachable structure, i.e. their inner ring, rollers and separator create a bearing assembly that can be installed independently of the outer ring.

Bearing series light, accuracy class zero.

Bearing 7208

- hole diameter d1 = 40 mm;

- diameter of outer ring D1 = 80 mm;

- bearing width B1 = 20 mm;

- dynamic radial load capacity Cr1 = 42.4 kN;

- static radial load capacity C0r1 = 32.7 kN;

- contact angle α = 14 °;

- distance from point of load application to bearing end

5.3 Selection of low-speed shaft bearings and keys

We choose radial-thrust ball bearings. These bearings are designed to receive both radial and axial loads. Moreover, the ability to perceive one-way axial load at these bearings depends on the contact angle α, which is the angle between the plane of the center of the balls and the straight line passing through the center of the ball and the point of its contact with the race. The radial thrust single row ball bearing can only receive axial load in one direction. For rigid fixation of shaft in axial direction two "tension" bearings are installed.

Bearing series light, accuracy class zero.

Bearing 215

- hole diameter d4 = 75 mm;

- diameter of outer ring D1 = 130 mm;

- bearing width B1 = 25 mm;

- dynamic radial load capacity Cr1 = 66.3 kN;

- static radial lifting capacity C0r1 = 41, kN;

- contact angle α = 12 °;

- distance from point of load application to bearing end

Literature

Zemlyansky Yu.M. Fundamentals of design of parts and assembly units of gears: Training manual for course design on machine parts. - Chelyabinsk: PMAI, 2003. 96 s. Anuryev V.I. Handbook of the designer - mechanical engineer: In 3 vols. - M.: Engineering, 1980. – 728 pages, 559 pages, 557 pages.

Berezin V. S., Kuleshov V. V. Development of kinematic schemes of drives in course design for machine parts: Tutorial. - Chelyabinsk: CSTU, 1994. – 49 pages.

Machine details: Atlas designs: Text. manual for students of engineering special universities. In 2 parts ./Reshetov D.N. - 5th ed., Rework. and additional - M.: Engineering, 1992. – 352 pages.

Dunaev P.F., Lelikov O.P. Machine details. Course Design: Manual for Mechanical Engineering Specialists. institutions of secondary and vocational education. - 3rd edition, redesign. and additional - M.: Engineering, 2002. – 536 pages.

Sohrin P.P. Belt gear design: Tutorial. - Chelyabinsk: CSTU, 1997. – 94 pages.

Ustinovsky E.P., Shevtsov Yu. A. Multivariable design of toothed cylindrical, conical and worm gears using computers: Training manual for course design on machine parts. - Chelyabinsk: CSTU, 1992. – 102 pages.