Rapid asphalt heating and extracting device for indoor experiment

Abstract

The invention belongs to the technical field of asphalt melting devices. A rapid asphalt heating and extracting device for indoor experiment comprises a base for an asphalt storage bucket to be placed, wherein a suspension arm capable of vertically lifting is arranged on the base, a hollow shaft which can rotate and can be plugged into the asphalt storage bucket is arranged at one end of the suspension arm, an asphalt output pipe is arranged at the other end of the suspension arm, an extracting guide tube, an extracting pump and an asphalt storage bin are sequentially connected in the suspension arm, the extracting guide tube is communicated with the hollow shaft and is connected through a rotary sealing part, and the asphalt output pipe is connected with the asphalt storage bin. The hollow shaft is provided with a plurality of stirring blades, heating devices are installed inside the blades, the peripheral wall of the hollow shaft among the blades are provided with a plurality of asphalt sucking holes. The rapid asphalt heating and extracting device can prevent asphalt separation, is high in heating efficiency and can rapidly guide out asphaltreaching the standard.

Description

technical field [0001] The invention belongs to the technical field of asphalt melting equipment. Background technique [0002] Asphalt is an organic binder in asphalt concrete. It is composed of hydrocarbons and non-metallic (oxygen, sulfur, nitrogen, etc.) derivatives. It is usually soluble in organic solvents such as trichlorethylene and stupid. It can be used for construction or indoor index test only after it is heated to a temperature above the softening point (130°C~165°C) to make it into a fluid state. [0003] Therefore, before the start of many asphalt index tests, the experimenters will put the cans containing the gelled asphalt on the electric furnace to heat and melt them before pouring them out for use. This method of heating and using liquid asphalt has relatively large limitations, which are mainly reflected in the following aspects: 1. Asphalt is mainly composed of macromolecular components such as saturated components, aromatic components, colloids, asphal...

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Problems solved by technology

However, when asphalt forms a gel state, due to the different molecular weights and relative densities of the various components in the asphalt, it is easy to cause the components with heavier molecular weights in the molten asphalt, such as colloids, to sink and the lighter aromatic components to float up, so that The internal components of asphalt are analyzed, and the properties of asphalt in different layers in the same sample are different (for example: layers with high saturated content have lower asphalt consistency and greater penetration; layers with more colloid content have higher viscosity becomes bigger, etc.), it cannot guarantee that it reflects the original material properties of asphalt

Using the traditional local heating method, the heating is uneven, the asphalt components after melting in different layers are inconsistent, and the problem of asphalt segregation is still not solved. If it is used in the asphalt index test, the error of the asphalt index measured is relatively large; 2. The heating method is from the outside to the inside. Most of the heat of the external heating device or heating layer is lost in the air holes, and the heat directly acting on the asphalt is less (that is, the heating efficiency is low), which eventually leads to a slower melting rate of the asphalt; 3. Under normal circumstances, when the temperature of asphalt exceeds its softening point (generally above 65°C), its gelled state will be broken and gradually become a fluid state.

However, most asphalt (especially modified asphalt) can only show a strong enough viscosity after the heating temperature reaches 130~165°C, and can carry out many performance tests of asphalt and aggregates (for example, the premise of a set of Marshall index tests is that the product The temperature of the asphalt reaches 130°C and above); with the traditional heating method, the heating temperature cannot be accurately controlled during the heating process. On the one hand, it delays the progress of the test, and on the other hand, it is easy to cause asphalt to age and affect the test analysis results; 4. The existing way to export melted asphalt is to set a discharge port at the bottom of the tank or dump it directly, but in actual operation, when the test temperature is reached When the melted bitumen flows to the outlet of the tank or when it accumulates to a certain amount and can be dumped, the temperature is usually lowered below the test temperature, that is, this method cannot quickly export the melted bitumen that reaches the test temperature (standard bitumen)

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