Two-stage cylindrical reduction gear - belt conveyor drive

Contents

Introduction

1. Product Summary and Purpose

2. Kinematic calculation of the drive

3. Select Calculation Variant

4. Preliminary Shaft Calculation

5. Chassis Design

6. Bearing calculation

6.1.On high-speed shaft

6.2.On the intermediate shaft

6.3.On low-speed shaft

6.4.On drive shaft

7. Shaft Strength Check

7.1. High-speed

7.2. Intermediate

7.3. Low-speed

7.3. Driving

8. Calculation of connections

8.1.With interference

8.2. Shponochny

8.3. Pin Calculation

8.4. Calculation of glue joint

9. Calculation of belt transmission

10. Selection of lubricants

11. Coupling Selection and Calculation

List of used literature

Introduction

The purpose of the course project is to design the belt conveyor drive.

Components of the drive are an electric motor, a V-belt transmission, a cylindrical reduction gear, a clutch, a drive shaft, a tensioner, and an unloading bushing.

The drive device is as follows: torque is transmitted from the electric motor to the input shaft of the reduction gear by means of a belt gear (U _ p = 2.5); from output shaft of reduction gear box through clutch to drive shaft.

You need to perform the necessary calculations, select the best diagram parameters and develop design documentation for the manufacture of the drive:

1) Drawing of general view of cylindrical reduction gear box, drive shaft, coupling .

2) Gearbox assembly drawing (at the technical design stage);

3) Working drawings of gearbox parts;

4) General view drawing of the drive;

5) Calculation and explanatory note and specifications;

Product Summary and Purpose

Belt conveyor is designed for continuous horizontal transportation of various loads.

The belt is moved by means of a cast drum. The rotation is transmitted to it by means of a drive consisting of a cylindrical two-stage reduction gear (unfolded circuit) and an asynchronous electric motor (IM 1081 version), communicating by means of a belt transmission, the driven pulley of which is installed on the unloading bushing. Connection of drive shaft and low-speed shaft of reduction gear box is performed by means of coupling. Drive station is mounted on welded frame of conveyor.

Power is supplied from the AC 3-phase current network with a frequency of 50 Hz and a voltage of 380 V. Typical loading mode III. Design life is 10000h with reliability of rolling bearings 90%, gears 98%. Mass production - 500 pieces per year.

Select Calculation Variant

Gearbox gears are calculated on the computer. According to its results, 9 versions of the 2 stages of the reduction gear were obtained. Selection of the optimal version is carried out by means of 8 parameters characterizing transmission.

The 6 option was chosen for the following reasons. Wheel hardnesses (28.5HRC) and gears (49HRC) are optimal for transmission operation, giving better protection against wear and tooth fracture. The total axial distance is 240mm, which is the most optimal distance. Best lubrication condition.

Calculation of belt transmission

Calculation of belt transmission with wedge belts is made on computer. According to its results, 8 versions of the belt transmission were received.

The transmission is selected by optimizing 5 parameters.

A feature of this transmission is the landing of the driven wheel on the unloading bushing, which gave additional restrictions on the parameters of the pulleys. The pulley fits on the bushing by means of two bearings with a total rim width of 40 mm, therefore, the pulley width should exceed this value. From the remaining options, we choose one that has less pulley diameters and which provides the smallest axial distance.

The selected variant 4 has the following parameters: The axial distance is 212 mm. The width of the crown is 65 mm. The number of belts is 4. Section A. Diameters of driving pulley 100mm driven by 250mm.