Turbine mixer Assembly drawing

Contents

Introduction

1. Analysis of literature on this topic

2. Design Documentation Development and Calculations

3. Planning Solutions

4. Economic part

5. Occupational safety

6. Literature used

7. Applications

Introduction.

Currently, abroad there is a tendency to replace obsolete roller mixers with turbine ones. This is due to the fact that the turbine mixers have higher quality of the prepared mixture, lower energy consumption, and much smaller dimensions. As a result, there was a need to develop domestic analogues. The MAZ steel shop undergoes industrial tests of a prototype turbine mixer for the preparation of core and molding mixtures (patent RB No. 444). During the tests, the design shortcomings of the mixer were manifested. In particular: insufficient reliability of the turbine drive gearbox, imperfection of the chain tensioner, as well as insufficient reliability of the final mixture unloading mechanism. The purpose of the diploma project is to develop a more productive mixer, as well as to eliminate the shortcomings of the prototype in the design of the designed mixer .

2. Design Documentation Development and Calculations

2.1 Development of design documentation

Purpose - mixer is intended for quick and high-quality preparation of moulding mixture, which meets modern technological requirements of casting production.

Field of application - mixer is intended for operation in foundry shops.

2.1.4 Maintenance

The system of overhaul cycles determines the procedure, periodicity of timely inspection, maintenance and repair of the mixer during its operation.

Maintenance is performed during the break in operation of the mixer without disruption of the production process by the workers operating the mixer and on-duty personnel of the repair service of the workshop (locksmiths, electricians, lubricants, etc.)

Inspections for repairs are carried out in accordance with the schedule of PPM with shutdown

mixer for works performance.

Service type - periodic.

3 types of maintenance during two-shift operation are provided:

- TO1 - daily (maintenance)

- TO-2 - monthly (inspection)

- TO3 - every three months (maintenance)

TO-1 consists in checking the serviceability of all parts of the mixer and the correct interaction taking into account safety and industrial sanitation regulations.

TO-2 is carried out once a month by the personnel of the repair service and establishes the following type of work.

- measure the heating temperature of bearings at the end of the shift after intensive operation shall not exceed:

a) rolling bearings - plus 70 ° С,

b) sliding bearings - plus 60 ° С.

If the heating temperature exceeds the specified ones, then it is necessary to identify the causes and eliminate them;

- make sure of tightness of fastener bracing and safety of binding wire on them;

- check tightness of connections;

- check operation of safety devices and interlocks;

- check tension of chains.

Tighten the circuit when the engines are OFF.

TO-3 is carried out once every three months by the repair service and establishes the following list of works:

- clean from contaminants and grease, wash with white spirit and wipe external parts of mixer units;

- check and tighten attachment of all mixer units;

- check integrity and tightness of pneumatic cylinder and replace seals if necessary;

- clean electric motors, cabinets, buttons attachment on the panel from dust;

check attachment of all devices to the cabinet, switches and signal equipment, condition of their contacts;

- rinse if necessary.

During the operation of the mixer, starting from its start-up, it is mandatory to keep an operating log in which to record the technical maintenance of TO2. TO3 indicating:

- performer;

. service dates;

- tested units;

- detected deviations;

- tested adjustments;

- replacement of parts, materials .

4.1 Economic evaluation of the technical solution

The economic evaluation of the technical solution is comprehensively characterized by the useful effect of new technology and competitive scientific capacity.

The useful effect of the new technique is the cost assessment of its consumer properties: productivity, reliability, quality of products, consumption of electricity and materials, production premises and other resources.