Bucket Conveyor Engineering Course Design

Contents

Bucket Conveyor Sketch

Introduction

1. TECHNICAL PROPOSAL

2. CONVEYOR CALCULATION

2.1. Define main pipeline parameters

2.2. Bucket conveyor traction calculation

2.3. Motor selection and kinematic calculation of the drive

2.3.1. Selection of motor and gear box

2.3.2. Selection of couplings

2.4. Calculation of conveyor for start-up and braking

2.4.1.Compute conveyor for start-up

2.4.2. Calculation of brake torque and brake

2.5. Pipeline Assembly Design

2.5.1. Determining the main parameters of the tensioner

2.6. STRENGTH CALCULATION OF CONVEYOR MAIN PARTS

2.6.1. Tensioner axis calculation

2.6.2. Calculation of drive shaft

2.6.3. Calculation of key connections

2.6.4. Refined endurance shaft calculation

2.6.5. Calculation of sliding bearings

3. STEEL STRUCTURE CALCULATION

4. SAFE WORKING CONDITIONS

5. CONCLUSION

6. List of literature used

INTRODUCTION

Introduction.

Basic types of bucket conveyors and principle of operation.

The conveyors of this group are double-chain and are designed to transport goods along complex vertically closed routes (Figure 1) with horizontal and vertical sections. They use different transportation principles. In bucket conveyors with closed and fixed buckets, the load moves in buckets (bulk load) hinged to traction chains.

Two parallel roller chains resting on horizontal sections of track on guide rails are used as traction elements of conveyors, and ladles are used as load-carrying elements. Drive and tensioner are arranged in both upper and lower parts of conveyor depending on route configuration. The direction of the alignment changes with deflecting sprockets. Loading is usually carried out at the bottom of the conveyor and unloading at the top. In vertical sections of the route, the load-carrying web is protected from swinging by rails enveloping the chain rollers on both sides.

Peculiarity of bucket conveyors is plane-parallel movement of load-carrying elements in all sections of route, excluding places of bucket conveyors unloading, where it is carried out by bucket overturning.

Axis of bucket hinge suspension is arranged so that bucket center of gravity is located above it in both empty and loaded state. Due to this, the ladle in all sections of the route retains a stable plumb position without additional fixation; unloading the bucket by rollover requires forced action on it, and after emptying it itself returns to the original plumb position.

Advantages and disadvantages of bucket conveyors.

The advantages of bucket, scraper and cradle conveyors include the non-overloading transportation of bulk and piece loads along complex vertically closed routes with horizontal and vertical sections, the compactness of the layout of transport and technological equipment, the ease of loading and unloading anywhere on the route, the possibility of automating these operations and the conveyor as a whole, and the suitability for transporting hot loads.

Their disadvantages are complexity, large mass and high cost of equipment, crushing of cargo and increased wear of friction parts (chutes and buckets). And also some complexity, both the manufacture and operation of the conveyor due to the large number of hinges and rollers that require regular lubrication; possibility of swinging and striking buckets against each other at increased speed (more than 0.4 m/s).

Scope of bucket conveyors.

Bucket conveyors are used to transport dry well-loose bulk loads (coal, limestone, calcium carbide, special charge, etc.) and in cases where it is necessary to ensure the most compact layout of transport equipment when combining horizontal movement of the load with its rise to a significant height and distribution over several points (for example, bunkers). For the transportation of wet and sticky loads, they are not suitable due to the difficulty of unloading and cleaning buckets. These conveyors were most widely used at plants in the chemical industry (soda, synthetic rubber, etc.), at fuel supplies of power plants, coke and gas plants and cement plants.

4.safe operating conditions.

Safety issues in the design and operation of transporting machines are given great attention.

General safety requirements when designing conveyors are regulated by GOST 12.2.022 - 80. They include design requirements (for the purpose of the conveyor, the features of transported goods and non-hazardous operation), devices of protective equipment (protective fences, interlocks, alarms) and the placement of conveyors in the production room (device of passages, passages for maintenance, etc.). Requirements for electrical equipment are regulated by the "Rules for the device of electrical installations" (PUE). Safety during operation of machines is determined by the corresponding operating rules and detailed instruction of workers and maintenance personnel.

Based on the above mentioned requirements, for safe operation of the designed bucket conveyor we will accept the following:

since the transported load has a slight dustiness, and for the convenience of servicing the conveyor during operation, a metal mesh is used as a protective fence;

To avoid swinging buckets when moving in vertical sections of the conveyor, guides are used that cover the rollers on both sides;

in case of breakage of the traction element, a catcher is provided, the principle of which is based on the actuation of a spring pushing the metal catcher into the profile of the chain in case of no tension of the traction element in the vertical section of the conveyor;

in the case of engine shutdown, an automatic brake is provided that prevents the self-propelled movement of the undercarriage in the reverse direction;

to protect the electric motor from overload in excess of the permissible one, a safety key is provided on the slow shaft of the reduction gear box, which is cut if the permissible torque is exceeded;

for safe operation of maintenance personnel, unloading bus is equipped with remote control.

5.zaklyucheniye

As a result of the work, a bucket conveyor with a capacity of Q = 100 t/h was designed for transportation along granular sulfur along a given route. Bucket speed is accepted in accordance with recommendations v = 0.4 m/s. Buckets are attached to two roller chains, which are driven by a reduction drive. Drive is provided with brake and two clutches. Tensioner is provided in drive structure.

The performed check calculations make it possible to conclude that the conveyor design meets the requirements of GOST and PUBE, as well as the possibility of its operation during the required period with the specified parameters.