Automation of the mixing process in the production of dry building mixtures

Contents

Contents

Introduction

Process Description

Setting the task for automation of a given part of the technological process and its feasibility study

Determination of disturbing physical quantities (parameters) acting on a given part of the process

Determination of monitored (recorded) physical quantities (process parameters) on a given part of the process

Determination of physical quantities (process parameters) controlled on a given part of the process

Determination of control actions to change the controlled physical quantity (process parameter) on a given part of the process

Selection of the main controlled physical quantity (process parameter)

Development of structural diagram of the main circuit of the automatic control system

Development of main control loop operation algorithm

Determination of physical values (process parameters) measured by emergency protection in the specified part of the process

Development and description of the structural diagram of the ESD circuit of the specified part of the process

Development of ESD loop operation algorithm

Design and description of automation diagram

Selection of measuring, monitoring and control devices for the main circuit with specification

Conclusion

List of used literature

Introduction

In recent years, dry building mixtures are increasingly used in the construction complex, which are carefully prepared in factory conditions mixtures of various purposes, consisting of mineral binders, fillers and polymer modifying additives.

To give special properties, mixtures may include hardening accelerators or retardants, blowing agents and defoaming agents, coloring agents, hydrophobizing agents and other additives.

Unlike commercial mixtures prepared according to traditional technology in a ready-to-use form, dry mixtures are delivered to objects in dry form. Dry mixtures are ready for use by closing them with water in accordance with the manufacturer's recommendations.

The introduction of technologies for the preparation of dry building mixtures, the use of bunker transportation and machine laying of building mortars reduce economic and temporary losses on transportation, significantly increase labor productivity.

Obtaining high-quality construction mixtures is one of the most important tasks of modern construction technologies. Today, the mixing of bulk materials has become a special branch of technological knowledge, which is based on mechanical processes, the goals of which are to ensure the highest degree of alignment of individual components in the mixture.

Setting the task for automation of a given part of the technological process and its feasibility study

When automating the mixing unit, we have to gain the following competitive advantages:

Maximum performance. Procedures for forming a given dose of components, their mixing should be carried out simultaneously and independently of each other, which will allow to obtain the maximum possible capacity of the plant.

Component dosing stability. The dose of components prepared in the weighing bin is discharged directly into the mixer, always completely and without residue, regardless of the physical properties of the components or atmospheric conditions. Doses of components intended for mixing are set from the signage of the weight terminal of the automated control system, which monitors the operation of the mini-plant as a whole and corrects the rates of supply of materials.

No process losses. Due to the discharge of the finished mixture from the mixer directly into the dispenser hopper, the prepared mixture is packed without residue - during reconfiguration to other formulations, time is not wasted to remove the remaining mixture from the conveyor reloaders and there is no loss of the mixture.

Reduction in the proportion of manual labor. Increasing the overall level of production automation reduces the need for a large number of workers in production, thereby reducing the cost of the finished product.

Conclusion

During the course project, the technology for the production of dry building mixtures was analyzed. An optimal set of equipment was found that contributes to the efficient operation of the enterprise.

Disturbing, controlled physical process values and the effects controlling these values have been determined.

Algorithm of ESD system operation is developed.

During the work on the project, a production area was identified that requires additional control, a version of automation of this technological process is proposed.