CONTENTS:

1. Topic importance
2. Analysis of technological process
3. Aim and objectives of work
4. Review of existing and projected results
5. Conclusions
6. List of references

1 Topic importance

         Batching of refractory body - the important fabrication stage of refractory products for an iron and steel industry.
         Refractory mix make from crude ground clay of different fractions.
          The dosage compound mixtures should be made in strictly set parities or with small deviations from the installed norms. As the given operation considerably influences quality of refractory products.

2 Analysis of technological process

         Manufacture of refractory products consists of following operations:

- rough crushing of clay;

- drying of clay;

- grinding of clay on chamotte;

- grinding and division of clay on a sheaf;

- roasting of chamotte;

- crushing of chamotte;

- grinding and division of chamotte on fractions;

- dosage of components of a mixture;

- mixing and humidifying of a mixture.

3 Aim and objectives of work

         During work of a technological line there are following lacks:

1. in bunkers the part of a weighed material hangs;

2. it is not completely closed bunker shutters;

3. influence such parameters as, the size of grains of a loaded material, temperature and humidity of an environment is not considered.

The purpose of the given work is increase of a production efficiency refractory products.

- automatic measurement of a level of loading of bunkers and formation of signals of management by electric drives of conveyors-feeders and bunker shutters;

- application tenzoresistors, which allow to raise accuracy of batching.

- weight of a material in dosing out bunkers (kg);

- level in account bunkers (m);

- management of feeders;

- the control of position of shutters of dosing out bunkers.

4 Review of existing and projected results

         Figure 1 shows block diagram of the device.

         The input of a sensitive element - the strain gauge is influenced with the measured size. Entrance size is the weight шамота (m), which will be transformed by virtue of the bunker acting on fixing beam on which gauges are placed.
         Influencing force, in turn, causes change of length of an elastic element (L2 - L1) (compression) on which the measuring device is placed. Change of length is transferred to strain gauges on which it will be transformed to electric signals - change of resistance which it will be transformed to target pressure Uout.
         To strengthening a signal of the gauge apply not inverting operational amplifier where the pressure increases and then enter to ADC (analog-to-digital converter) built-in MC.. There is a coding a measured signal in a binary code. The coded signal is analyzed in MC.
         The arrangement of the coordination with an agency provides regulation of position of shutters and work of the conveyor - a feeder by means of the microcontroller.
         The block of indication is stipulated for a conclusion of a current condition of the block of loading of the dosing out bunker.
         Use of gauges of the maximal and minimal levels of a material in the account bunker, allows to raise accuracy of batching.

5 Conclusions

         The input of a sensitive element - the strain gauge is influenced with the measured size. Entrance size is the weight шамота (m), which will be transformed by virtue of the bunker acting on fixing beam on which gauges are placed. In the given work the arrangement of automated management has been developed by loading of the weight bunker and the control of a level of a material over the account bunker which provides:

1. Exception of excess of the set doze of a weighed material and full unloading of the dosing out bunker (exception of sticking of weighed components);

2. Processing of entrance signals and management of the electric drive of feeders and dampers;

3. The control of blocking of emergencies.

         All this, in turn, allows to raise accuracy of batching that is the major condition of achievement of high technical and economic parameters of manufacture and release of competitive production.