Continuous Bitumen Equipment
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The continuous bitumen equipment is divided into rotary and plunger type machines. This separation indicates not only the nature of the forces causing emulsification (inertial forces in the first type and pressure from the plunger action in the second), but also the main structural parameter of the machine in the first type – the presence of a stator and rotor, and in the second – a deaf emulsification chamber. In road practice, the most widely used machines are the rotary type. Plunger-type homogenizers are widely used in the food industry.
Structurally, the rotor type of machines is simpler – it has a significantly smaller number of moving parts than a plunger one, and is more adapted for use in the road sector.
To create the best conditions for emulsifying, the working surfaces of the stator and rotor are given a different shape (conical, cylindrical, parabolic, sinuous, etc.).
With winding and serrated surfaces, in addition to frictional forces, shearing forces also appear that promote dispersion. When the elliptical shape of the working body is usually created a variable section of the working gap between the rotor and the stator, and this automatically maintains the pressure of fluids. With a conical shape, depending on the size of the taper, the magnitude of the component forces that push liquids into the working gap changes. Conical and cylindrical shapes are easier to manufacture.
In addition to single rotor, there are homogenizers, in which there are several rotors (disks) on the same shaft, and emulsifiable liquids pass through all working gaps sequentially. This process of emulsification is called multistage and in practice it is often used to introduce additional components into the emulsion.
To improve the performance of single-rotor homogenizers, they are made multi-gap with simultaneous emulsification of the liquid in all working areas.
Machines for batch operation in road practice are used only as mixers for the preparation of highly concentrated direct emulsions and reverse type emulsions. In constructive terms, the agitators are divided into bladed and screw bent. Multi-turn paddle mixers are used for the preparation of concentrated direct emulsions.
Installation for the preparation of bitumen emulsion UVB-1 is designed to produce both cationic and anionic bitumen emulsions that are used in road construction:
- for priming the base of the old pavement before applying asphalt concrete on them;
- for the preparation of cold asphalt mixes;
- for surface treatment of pavements;
- for the device of thin protective layers of coverings;
- for patching of roads;