JPS5814886B2 - Asphalt mixture recycling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for recycling asphalt mixture.

This is based on the patent application No. 52-1453 related to the applicant's earlier application.
No. 38 (filed on November 25, 1975), the solid packaging of asphalt mixture is put into heated water in a melting tank and melted using heated steam or hot water as a heat source. The objective is to improve the asphalt mixture recycling processing means, which is configured to separate and settle it onto a feeder at the bottom of the tank, and transport it underwater to sort and collect it as recycled material coated with asphalt of the desired particle size. In particular, the melting tank is divided into multiple stages using a lattice frame with different squares, and the steam injection in each chamber is controlled by the temperature detection means installed in each chamber, and an apron flap is installed at the bottom of the tank. By installing a feeder and installing a gate for adjusting the passage of recycled material on the exit side of the feeder, it is possible to improve the efficiency of recycling processing, automate processing control, prevent insoluble foreign matter from entering, and further improve processing accuracy of recycled material. This is a useful way to deal with the problem of increase.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
Reference numeral 1 denotes a dissolving tank for asphalt mixture that stores water by forming a material input port 2 on the upper surface, and has V-shaped hopper-shaped bottom plates 3 and 3' formed at the bottom, and a feeder at the bottom 4 of the central tank. There are 7 in some cases.

A lattice frame 5 is provided in the melting tank 1, and a material input port 2 is provided.
The system uses a step-by-step dissolution mechanism that gradually melts relatively large waste materials (solid blocks of asphalt mixture) introduced from the ground into smaller pieces and guides them downward.

As for the stepwise melting mechanism here, it is desirable to provide multiple stages of lattice frames 5 with different squares, and this apparatus shows a case where three lattice frames 5a to 5c are provided in multiple stages.

Therefore, the grid frame 5a of three bodies with the square size of dog medium and small
, 5b, 5c are supported across the melting tank 1, and among them,
As shown in FIG. 4, a two-stage lattice frame 5a with relatively large squares is placed on the upper side above the dissolution tank 1, and a lower lattice frame 5c with relatively small squares as shown in FIG.
between the bottom plate parts 3 and 3' below the dissolving tank 1, and the middle lattice frame 5a with medium grid size as shown in FIG. ing.

Reference numeral 6 denotes a steam ejection pipe for ejecting heated steam upward, and one or more pipes are arranged at the bottom of the lattice frame 5, of which a pipe as shown in FIG. 6 is installed at the bottom of the middle lattice frame 5b. A branched steam jet pipe 6a is provided as shown in FIG. 8, and a steam jet pipe 6b is provided below the lower lattice frame 5c as shown in FIG. Reference numeral 8 denotes an apron feeder of the feeder portion 7, which is supported on the tank bottom 4 so as to be rotatable in the direction of the arrow in FIG.

Reference numeral 15 denotes a gate for adjusting the passage of the recycled material formed on the exit side of the apron feeder 8, and allows the pressure passing through the gap between the apron feeder 8 and the apron feeder 8 to be adjusted by a spring force of an adjusting spring 16.

Reference numeral 9 denotes a transfer chute section for recycled materials connected to the outlet of the feeder section 7, and 10 indicates a packet conveyor tank tilted at the outlet section of the transfer chute section 9, into which the recycled material is sent out from the transfer chute section 9. It rotatably supports a packet conveyor 11 that pumps up recycled materials.

Reference numeral 14 denotes a water supply pipe connected to the upper part of the packet conveyor tank 10, and water is supplied from the water supply pipe 14 to store the packet conveyor tank 10 and the dissolving tank 1 at the same water level W.

Reference numeral 12 designates a discharge chute portion formed at the upper part of the conveyor tank 10, and reference numeral 13 designates a vibrating screen provided at the outlet of the discharge chute portion 12 for sieving the recycled material according to particle size.

Reference numeral 17 denotes a thermometer installed in each chamber divided by the grid frame 5 and the steam injection pipe 6. Based on the temperature detection result of each chamber by the thermometer 17, the steam injection from the steam injection pipe 6 can be controlled only by ml. First, it controls the on/off of rotation of the apron feeder 8, its rotation speed, etc.

Thus, water is supplied from the water supply pipe 14 to the dissolving tank and the packet conveyor tank 10 to store water up to a predetermined water level W shown in FIG. The water in the dissolving tank 1 is boiled, and at the same time,
A solid block diagram (waste material) of asphalt mixture is inputted from the material input port 2 of the dissolving tank 1.

Then, relatively large blocks among the waste materials are placed on the upper lattice frame 5a, and blocks smaller than the squares of the upper lattice frame 5a pass through the upper lattice frame 5a and are placed on the middle lattice frame 5b. The waste blocks on the middle lattice frame 5b are directly immersed in hot water, and the waste blocks on the upper lattice frame 5a are immersed directly in the steam jet pipe 6a at the bottom of the lattice frame 5b. In the hot water formed by the heated steam jetting out from below, the asphalt is indirectly heated and softens, and its own weight is also added to it, causing it to roughly melt and separate. The blocks that have fallen onto the frame 5b are directly heated by the heated steam from the steam jet pipe 6a at the bottom, causing the blocks to soften and melt and fall onto the lower lattice frame 5C.

The blocks on the lower lattice frame 5C are directly heated again by the heated steam from the lower steam jet pipe 6b and are reduced to fine particles.

At this time, if a structure is added in which the lattice frames 5a to 5c are slightly moved by an external force or a rotating body is used to operate the sieve, the amount of drop passing from each lattice frame 5a to 5C becomes more stable.

In this way, by passing from the upper lattice frame 5a with large squares to the lower lattice frame 5C with small squares, the original waste wood blocks are made as fine as possible and are reduced to appropriately sized particles with asphalt attached to the surface of the aggregate. The recycled material settles and accumulates on the apron feeder 8 at the tank bottom 4, and is conveyed underwater to the outlet side.

At this time, a gate 15 that is pressurized and adjusted by an adjustment spring 16 is provided on the exit side of the apron feeder 8.

Therefore, when the recycled material passes through the narrow gap between the gate 15 and the apron feeder 8 by rotating the apron feeder 8, it is separated while receiving the required pressure from the gate 15 and is made into finer particles. The packets fall from the transfer chute section 9 to the lower part of the packet conveyor tank 10.

The recycled materials that have fallen into the packet conveyor tank 10 are pumped up into the water by the packet conveyor 11, transported above the water level W, discharged to the outside through the discharge chute 12, and recycled by the vibrating screen 13 into the required particle size. The materials are separated and taken out.

In the above case, the gap between the apron feeder 8 and the gate 5 is
The gap is adjusted so that the maximum particle size of the recycled material passing through the adjustment gate 15 is approximately 30 mm.

Therefore, in order to allow recycled crushed stone of a larger size to pass through, the adjustment spring 16 is used to widen and adjust the gap between the gates 15.

Moreover, in the above case, the frame frame 5 having the steam jet pipe 6
After forming the melting tank 1 into multiple chambers, the temperature of each chamber is detected by the thermometer 17, and the steam injection from the steam jet pipe 6 is controlled according to the instruction from the thermometer 17. It is configured to control the intermittent control of the IDA 8 and its rotation speed.

This will further improve the efficiency of recycling waste blocks.

Moreover, by further installing one or more combinations of the lattice frame 5 and the steam jet pipe 6 in the melting tank 1, it is possible to recycle the recycled material with even higher quality accuracy.

In the first place, the softening degree of the asphalt component in asphalt mixture increases in proportion to the temperature, and the separation effect for producing the material is better at higher temperatures, and the ability to separate fine particles becomes higher. It is.

Therefore, in terms of quality, asphalt recycled material that can be used for reuse is sufficient as long as it is within the practical range, and the appropriate temperature during recycling treatment is determined from both workability and separability. It is.

In any case, the smaller the temperature change during the recycling process, the more stable the quality of the recycled material can be obtained.

At that time, the operating (processing) temperature is almost 1 degree Celsius because water is used as the medium and the pressure is in the open dissolution tank 1.
The practical working temperature is below 00 degrees Celsius and between 85 and 100 degrees Celsius.

Furthermore, in order to increase the regeneration processing capacity, it is necessary to supply a large amount of heat, and therefore either heating steam, which is a high heat source, or water, that is, hot water, which has a large amount of heat, is required.

Furthermore, it is most advantageous to use heated steam as the heat source from all aspects such as the stability of the operating temperature and the practicality of the equipment.

Next, the specific heat of the asphalt mixture as a whole is 0.22 for asphalt and around 0.2 for most crushed stones, so the ratio of the amount of heat required for melting to the amount of heat contained in water is approximately 5. It has double the capacity, and since the entire waste material is submerged in water, the heat transfer surface is wide and the heat transfer efficiency is high.

Next, regarding the method of applying physical external force to separate each material, the waste material that is heated and settled in the water in the melting tank 1 is placed on a feeder part 7 having a metal apron feeder 8. If the material is dropped and is conveyed by the feeder part 7, if resistance is applied by reducing the exit area, friction will occur between the materials, increasing the separation phenomenon and forming a gap with the feeder part 7. By adjusting the gate 15, the strength of the acting force can be adjusted to improve the uniformity of the separation effect.

Moreover, by providing the gate 15 with a buffering effect using a spring and a limiting device using a stopper, the safety of the device is ensured when large crushed stones or other foreign objects pass through, and the rotational speed of the feeder and the amount of material conveyed are regulated. They can each fulfill their respective roles.

Next, if a large-sized foreign object such as a concrete lump is mixed into the waste material, the lattice frames 5a to 5C, which are smaller in size than the maximum passing capacity of the gate 15, are installed in front of the feeder part 7 to prevent the passage of the foreign object. It plays the role of preventing breakdowns, breakdowns, and other troubles.

The lattice frame 5 also has the effect of protecting the steam jet pipe 6 from the impact of falling waste materials, and also plays an important role as a boundary gate when controlling the temperature of each chamber in stages.

If the sizes of such lattice frames 5a to 5C are set so that they are large at the top of the melting tank 1 and become smaller toward the bottom, they can be used to prevent large foreign objects from passing through, and to be used as partition walls in the temperature control room or in the vicinity. By providing a rotating gate screw or the like, it is possible to regulate the amount of material passing through and to ensure smooth conveyance.

The present invention constitutes the main part of an asphalt mixture recycling plant, and is useful for increasing the efficiency of the dissolution and separation operations necessary for the production of recycled materials, as well as improving the quality accuracy thereof. The effects are listed as follows.

Since the entire mechanism is underwater, the weight of heavy materials is reduced by their weight underwater, reducing the load, and since the materials are coated with asphalt, there is extremely little wear on each part.

The material can be transported by the apron feeder and the materials can be separated by the frictional force between them in the same process, and the transport amount, load conditions, and co-stability are superior to a set of screws.

The adjustment gate allows both the removal of problems caused by oversizing and the isolation effect from external force caused by the spring, and its structure is simple.

By using the combination of the lattice frame and the heat source injection mechanism as a partition wall to partition the melting tank, it is effective in controlling the temperature of each layer and preventing damage caused by foreign objects, and it also has a great effect on improving the quality of the material.

That is, the melting tank is divided into multiple stages using a lattice frame having steam injection pipes, a temperature detection means such as a thermometer is provided in each chamber, and the steam injection is controlled intermittently based on the temperature detection result of each chamber. By intermittently controlling the rotation of the apron feeder or controlling its rotation speed, automatic control of the regeneration process can be achieved.

Further, by dividing the melting tank with multi-stage lattice frames, a type of pressure chamber is formed in each compartment during the process of recycling the asphalt mixture charged into the melting tank.

Moreover, the temperature inside the tank is set higher at the bottom of the tank than at the upper tank.

Therefore, the partition wall of the lower lattice frame part is ruptured by the injection of heated steam, and the dissolved and separated material is allowed to settle downward, and when the temperature drops to the required temperature, steam is again injected to increase the temperature and close the partition wall.

These actions are repeated for each chamber as it settles from the top to the bottom.

At this time, the heat of the supplied steam injection is effectively transferred and consumed for dissolving and separating the asphalt mixture, making it very economical.

There are extremely few pollution-related factors such as odor, dust, noise, and oil floating substances associated with heat treatment.

[Brief explanation of drawings]

Fig. 1 is a front view of the device, Fig. 2 is a side view thereof, Fig. 3 is a plan view thereof, and Figs. , FIG. 4 shows the upper lattice frame, FIG. 5 shows the middle lattice frame, FIG. 6 shows the steam jet pipe, and FIG. 7 shows the lower lattice frame. FIG. 8 is a plan view showing a part of the feeder provided at the bottom of the dissolution tank. Code Table 1 Melting tank 2 Material input port 3 Bottom plate part 4 Tank bottom part 5
Lattice frame 6 Steam jet pipe 7 Feeder part 8 Apron feeder 9 Transfer chute section 10 Conveyor tank 1 1 Packet conveyor 12 Drainage chute section 1
3 Screen 14 Water supply pipe 15 Gate 16 Spring 17 Temperature meter

Claims (1)

[Claims] 1. A solid block of asphalt mixture was put into heated water in a melting tank, dissolved and separated using heated steam or hot water as a heat source, and settled on a feeder at the bottom of the tank, which was then conveyed underwater and coated with asphalt. In an apparatus for recycling asphalt mixture configured to sort and collect recycled materials with a desired particle size, the melting tank is equipped with multiple lattice frames, the squares of the upper lattice frame are made larger, and the lower tier Let the squares of the lattice frame be of small size. A steam injection pipe is arranged on the lower side of the lattice frame, and the melting tank is divided into a plurality of chambers by the lattice frame having the steam injection pipe, and the temperature detection means provided in each chamber is used to inject steam into each chamber. 1. An apparatus for recycling asphalt mixture, characterized in that an apron feeder is provided at the bottom of the tank, and a gate for adjusting the passage of the recycled material is provided on the exit side of the feeder.