Belt conveyor drive - heading

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. Welded

8.4. Calculation of unloading bushing

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 transmission; from output shaft of reduction gear box through rigidly compensating 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 (at the stage of sketched design);

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;

1. Product Summary and Purpose

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

The belt is moved by means of a punching drum. Rotation is transmitted to it by means of motor reducer consisting of cylindrical two-stage reduction gear (unfolded circuit) and asynchronous electric motor (IM 1081 version) communicating by means of belt transmission, driven pulley of which is installed on 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. The calculation life is 10000h with a reliability of rolling bearings of 90%, gears of 98%. Mass production - 500 pieces per year.

9. Calculation of belt transmission

Calculation of belt transmission with wedge belts is made on computer. According to its results, 23 versions of the belt transmission were received.

The transmission is selected by optimizing 7 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 52 mm, therefore, the pulley width should exceed this value. Of the options proposed, only nine satisfy this condition. From the remaining options, we choose one that has less pulley diameters.

The selected variant 13 is characterized by the following parameters. Center Distance

260 mm. The width of the crown is 64 mm. The number of belts is 5 SPZ section. Diameters of driving pulley 100mm driven by 200mm.

10. Selection of lubricants

To reduce friction power losses and wear intensity of friction surfaces, as well as to prevent them from jamming, gouging, corrosion and better heat removal, the friction surfaces of the parts must have reliable lubrication.

A crankcase system is widely used to lubricate the gears. Oil is poured into the reduction gear case so that wheel rims are immersed in it. When rotating, the wheels entrain the oil, spraying it inside the body. Oil enters the inner walls of the housing, from where it flows into its lower part. Inside the housing, a suspension of oil particles is formed in the air, which covers the surface of the parts located inside the housing.

The principle for assigning oil grade is as follows: the higher the circumferential speed of the wheel, the lower the viscosity of the oil and the higher the contact pressure in the engagement, the greater the viscosity of the oil.

Therefore, the required viscosity of the oil is determined depending on the contact voltage and the circumferential speed of the wheels. Contact voltages (from printout).

It is important to ensure reliable lubrication of the slow-moving stage, so the calculation is carried out according to more of the stresses. Intermediate shaft speed

As per Table 11.1 [2 c. 198] kinematic viscosity of 70 mm2/s is selected. As per Table 11.2 [2 c. 198] oil grade I-G-A-68 is selected.

And - industrial

D - for hydraulic systems

A - oil without additives

68 - kinematic viscosity class

Lubricate bearings with the same oil. Since we have a crankcase lubrication system, they are lubricated by spraying.

Bearings on the unloading bushing are not included in the general lubrication system, therefore their lubrication is carried out by laying 0.05kg of "Litol 24" PSM.

Spherical bearings in the supports of the drive shaft are lubricated by laying of 0.07kg "TSIATIM -201" PSM

Put graphite grease of GTSh in the toothed coupling

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