Course project on "Design of Chain Conveyor Drive"

Contents

CONTENTS

Course Project Annotation

1. Purpose and scope of the drive

2. Technical characteristics of the drive

2.1. Electric motor selection

2.2. Determination of power, speed and torque for each drive shaft

3. Description and justification of selected kinematic diagram

4. Calculations confirming the operability and reliability of the structure

4.1. Defining Shaft Diameters

4.2. Design of housing parts and covers

4.2.1. Cover on high-speed shaft

4.2.2. Cover on slow-moving shaft

4.3. Selection of rolling bearings

4.3.1. Selection of bearings for high-speed shaft

4.3.2. Selection of bearings for low-speed shaft

4.3.3. Selection of bearings for drive shaft

4.4. Check of low-speed shaft bearings by dynamic lifting capacity

4.4.1. Definition of Bearing Loading Forces

4.5. Check calculation of the most loaded shaft for fatigue strength and stiffness

4.5.1. Identification of internal power factors

4.5.2. Calculating the Geometric Characteristics of Hazardous Shaft Sections

4.5.3. Calculation of shaft for static strength

4.5.4. Calculation of shaft for fatigue resistance

4.6. Selection and calculation of key connections

4.7. Calculation of chain transmission

4.8. Calculation of safety device

4.9. Gearbox lubrication selection

4.11. Sprocket calculation for traction plate chains

4.12. Gearing Calculation Results

5. Description of organization of works using the developed drive

6. Level of standardization and unification

7. List of literature used

8. Appendix A

9. Appendix B

10. Appendix B

11. Appendix D

12. Appendix D

13. Appendix E

Summary

This course project is devoted to the development of a chain conveyor drive.

The KP made the necessary calculations, check calculations were carried out on the designed parts.

As a result of this project, the following design documents were developed:

Gearbox housing drawing.

Gearbox drawing in section.

Details.

Damn an asterisk.

Drive shaft drawing

Assembly drawing of chain conveyor drive.

7. Specifications.

The course project includes 30 pages of an explanatory note, 6 annexes. 10 sources were used in the design.

Purpose and application of the drive

Proposed drive is designed for transmission and change of rotational motion from electric motor to drive shaft of chain conveyor. This drive includes: electric motor, V-belt transmission, cylindrical reduction gear, chain transmission and drive shaft with traction sprockets.

Chain conveyors are widespread in various fields of industry. The traction element is M20 plate chain GOST 58881. The chain makes it possible to conveniently and reliably fix the load-carrying and running elements of the conveyor, provides reliable transmission of traction force due to engagement of the chain links with a sprocket and is not pulled out under load.

At the same time as transporting the load on the chain conveyor, various processing operations can be carried out. Chain conveyors are especially widely used in assembly shops and factories, since the work of the chain conveyor can be automated and performed according to a given program. To move the load on the conveyors, plates are installed that form the conveyor web, ladles, special traps, trolleys, etc.

Description of organization of works using the developed drive

In the course project, a chain conveyor drive was developed. This drive uses an asynchronous three-phase motor AIR112MV6 with a power of 4 kW and a speed of 950 rpm. AI - series; P is a variant of power binding to installation dimensions; 112 is the height of the axis of rotation; B is the mounting dimension along the length of the bed; 6 is the number of poles.

A clutch is used to transmit rotation from the electric motor to the input shaft of the reduction gear box.

The drive uses a single-stage cylindrical reduction gear. It is designed to increase and transfer torque to the chain gear. The torque on the high-speed shaft is 43.649 Nm and the rotation speed is 950 rpm, and on the slow-speed shaft is 133.37 Nm and the rotation speed is 301.587 rpm. Gear ratio of reduction gear 3.15. Reduction gear consists of cast-iron housing accommodating shaft-gear and gear wheel, bearings and glands. The gearbox is assembled in accordance with the gearbox assembly drawing, starting from the shaft assemblies: bearings are put on the drive shaft; put the key in the driven shaft and press the gear wheel until stop against the shaft collar; insert bearings. Then we put the bearing covers. Before installation of through covers, install cuff seals impregnated with hot oil into grooves .

The assembled driven shaft is laid in the base of the reduction gear case and put on the cover of the case, covering the surfaces of the joint of the cover and the case with sealant. Check rotation of shafts, absence of clamping of bearings.

A drive sprocket of a chain transmission with a diameter of 213.76 mm is attached to the output shaft of the reduction gear. Chain transmission is intended for transmission of torque from reduction gear box to drive shaft. A sprocket with a diameter of 424.5169 mm with a safety device is installed on the drive shaft from the chain drive. The transmission uses the PR circuit 25,45670. The axial distance is 637 mm.

Drive shaft is secured on two supports with ball bearings by single-row radial bearings. In connection with the relatively large long shaft, significant assembly errors, the shafts are fixed from axial displacements in one support. The outer ring of the same bearing shall be free to move axially, leaving clearances of 3... 4 mm on both sides. When only radial forces are applied to supports, less loaded force is selected as floating force. The support located at the cantilever portion of the shaft on which the chain transmission is mounted should be made fixing. Two traction sprockets are installed on the shaft on the keys. The traction element is M20 plate chain GOST 58881. The chain makes it possible to conveniently and reliably fix the load-carrying and running elements of the conveyor, provides reliable transmission of traction force due to engagement of the chain links with a sprocket.

Level of standardization and unification

GOST 1558970 M10x100 bolt - is used for connection of the case and a cover of a reducer.

GOST 1558970 M8x30 bolt - is used for a privertyvaniye of covers of bearings to the case of a reducer.

Pin 10x30 GOST 312970 - used to accurately fix the position of the gearbox cover relative to the housing

Bearing 208 GOST 833875 - serves as support for low-speed gear shaft .

Key 12 x 8 x 28 GOST 2336078- for torque transmission from shaft to gear hub or vice versa.

Nut M10 GOST 591670 - used to assemble the housing and cover of the reduction gear box.

Spring washer 10 GOST 640270 - used for reinforcement of bolt-nut connection and for protection against self-screwing.

Lubricant press GOST 1985370 - used for lubrication of sprocket with safety device.