Double-roller asphalt mixture mixing plant for RAP heating

Abstract

The utility model belongs to the technical field of asphalt concrete mixing equipment, and particularly relates to a double-roller asphalt mixture mixing plant for RAP heating. The double-roller asphalt mixture mixing plant for RAP heating comprises a main plant, a first drying roller, a second drying roller, a first discharging box, a first combustor, a first combustion chamber, a second discharging box, a second combustor, a stirring cylinder, a first storage metering mechanism and a second storage metering mechanism. Through the arrangement of the first combustor, the first drying roller achieves reverse flow type drying, the heat efficiency of the first drying roller is improved, and the device is more suitable for heating coarse aggregate with the high heat efficiency requirement. And compared with the first drying roller, the second drying roller is lower in heat efficiency, is more suitable for heating the fine aggregate with low heat efficiency requirement, and can meet different drying and heating requirements of the coarse aggregate and the fine aggregate.

Description

Technical Field

[0001] The utility model belongs to the technical field of asphalt concrete mixing equipment, and in particular relates to a double-drum asphalt mixture mixing plant for RAP heating. Background Art

[0002] With the rapid development of asphalt pavement construction in my country and the extensive reconstruction and renovation of high-grade roads, the recycling and reuse of recycled asphalt concrete (RAP) has garnered significant attention and widespread attention. RAP heating has become indispensable in existing asphalt concrete mixing plants. Reusing heated RAP saves energy, protects the environment, and creates significant social and economic value.

[0003] RAP aggregates are extremely special, with coarse aggregate having a low asphalt content and fine aggregate having a high asphalt content. However, existing RAP systems use only one set of heating drums, which heat both coarse and fine aggregates. This results in poor drying drum operation and suboptimal RAP heating, with the coarse aggregate not being heated thoroughly and the fine aggregate aging at risk. Furthermore, common parallel-type plant-mix hot recycling equipment (used for asphalt pavement regeneration) includes both split and integrated units. The RAP heating unit typically only produces half of the overall capacity, limiting the maximum addition rate to 50% of the rated capacity. Increasing the addition rate would require reducing overall capacity. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a double-drum asphalt mixing plant for RAP heating, which can dry and heat the coarse aggregate and fine aggregate in RAP respectively.

[0005] The utility model adopts the following technical solutions:

[0006] A double-drum asphalt mixing plant for RAP heating comprises a main building, a first drying drum arranged on the main building for heating coarse aggregate, a second drying drum arranged on the main building below the first drying drum for heating fine aggregate, a first discharge box arranged at the discharge end of the first drying drum, a first burner connected to the first discharge box for supplying heat to the first drying drum, a second discharge box arranged at the discharge end of the second drying drum, a second burner connected to the feed end of the second drying drum, a mixing drum arranged on the main building, a first storage and metering mechanism connected to the first discharge box for supplying material to the mixing drum, and a second storage and metering mechanism connected to the second discharge box for supplying material to the mixing drum.

[0007] Furthermore, the first storage and metering mechanism includes a first hot material bin connected to the first discharge box, a first transition bin connected to the lower end of the first hot material bin, and a first metering bin connected between the first transition bin and the mixing tank.

[0008] Furthermore, the second storage and metering mechanism includes a second hot material bin connected to the second discharge box and a second metering bin connected between the second hot material bin and the mixing tank.

[0009] Furthermore, the first metering bin and the second metering bin are arranged opposite to each other above the mixing tank.

[0010] Furthermore, it also includes a first lifting mechanism that feeds the first drying drum, the first lifting mechanism includes a first elevator, a first feed box connected to the feed end of the first drying drum, and a first feed chute connected to the first elevator to feed the first drying drum, one end of the first feed chute is connected to the first elevator, and the other end is inclined downward and extends through the first feed box to the feed end of the first drying drum.

[0011] Furthermore, it also includes a second elevator that supplies material to the second drying drum, and the second elevator is provided with a discharge section that is inclined downward to the feeding end of the second drying drum.

[0012] Furthermore, it also includes a first combustion chamber arranged between the first discharge box and the first burner.

[0013] Furthermore, it also includes a finished product warehouse arranged on the main building and connected to the discharge port of the mixing tank.

[0014] From the above description of the utility model, it can be seen that compared with the prior art, the beneficial effects of the utility model are as follows: the present application defines the specific structure of the double-drum asphalt mixture mixing plant, and by arranging a first burner connected to the first discharge box to supply heat to the first drying drum, the first drying drum is made to achieve countercurrent drying, thereby improving the thermal efficiency of the first drying drum and being more suitable for heating coarse aggregates with high thermal efficiency requirements, wherein, by arranging a second burner connected to the feeding end of the second drying drum, the second drying drum is made to achieve downstream drying, and the thermal efficiency of the second drying drum is lower than that of the first drying drum, and is more suitable for heating fine aggregates with low thermal efficiency requirements, and can meet the different drying and heating requirements of coarse aggregates and fine aggregates, thereby solving the heating and sticking problem of different RAP aggregate gradations and improving the gradation stability of the finished asphalt mixture; at the same time, the present application realizes a double-drum structure by arranging the first drying roller and the second drying drum on the main building, thereby increasing the production capacity of RAP, wherein the first drying drum and the second drying drum are arranged up and down to realize a double-layer structure, which is compact in structure and reduces the space occupied by the utility model;

[0015] By providing a first storage and metering mechanism coordinated with the first drying drum and a second storage and metering mechanism coordinated with the second drying drum, the mixing plant forms two independent RAP storage and metering systems. The first drying drum and the second drying drum can operate independently or in a superimposed manner without affecting each other, thereby improving the practicality of the utility model.

[0016] By relatively setting the first metering bin and the second metering bin above the mixing tank, the recycled materials in the first metering bin and the second metering bin automatically fall into the mixing tank by utilizing the principle of gravity, without setting up additional chute transition, thus reducing equipment maintenance work. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of a double-drum asphalt mixing plant.

[0018] Figure 2 Schematic diagram of part of the structure of the double-drum asphalt mixing plant Figure 1 .

[0019] Figure 3 Schematic diagram of part of the structure of the double-drum asphalt mixing plant Figure 2 .

[0020] Figure 4 Schematic diagram of part of the structure of the double-drum asphalt mixing plant Figure 3 .

[0021] In the figure: 1-main building, 11-first drying drum, 12-second drying drum, 13-first discharge box, 14-first burner, 15-first combustion chamber, 16-second discharge box, 17-second burner, 18-mixing cylinder, 19-first storage and metering mechanism, 2-second storage and metering mechanism, 21-first lifting mechanism, 22-second elevator, 23-finished product warehouse, 24-first hot material warehouse, 25-first transition warehouse, 26-first metering warehouse, 27-second hot material warehouse, 28-second metering warehouse, 29-first elevator, 3-first feed box, 31-first feed chute, 32-discharge section. DETAILED DESCRIPTION

[0022] The present invention is further described below through specific implementation methods.

[0023] like Figures 1 to 4 As shown, this embodiment provides a double-drum asphalt mixing plant for RAP heating, including a main building 1, a first drying drum 11, a second drying drum 12, a first discharge box 13, a first burner 14, a first combustion chamber 15, a second discharge box 16, a second burner 17, a mixing tank 18, a first storage and metering mechanism 19, a second storage and metering mechanism 2, a first lifting mechanism 21, a second elevator 22, and a finished product bin 23.

[0024] The first drying drum 11 is used to heat the coarse aggregate and is arranged on the main building 1, wherein the second drying drum 12 is used to heat the fine aggregate and is arranged on the main building 1 below the first drying drum 11; by the first drying drum 11 and the second drying drum 12 arranged on the main building 1, a double-drum structure is realized, thereby increasing the production capacity of RAP. At the same time, the first drying drum 11 and the second drying drum 12 are arranged up and down to realize a double-layer structure with a compact structure, which reduces the floor space occupied by the utility model; specifically, the first discharging box 13 is arranged at the discharging end of the first drying drum 11, the first burner 14 is connected to the first discharging box 13 to supply heat to the first drying drum 11, the second discharging box 16 is arranged at the discharging end of the second drying drum 12, and the second burner 17 is connected to the feeding end of the second drying drum 12; the first drying drum 11 and the second drying drum 12 are respectively realized to realize countercurrent drying and downstream drying, which can meet the coarse aggregate and fine aggregate requirements. The different drying and heating requirements for aggregate and fine aggregate not only solve the heating and sticking problem of different RAP aggregate gradations, but also improve the gradation stability of the finished asphalt mixture; further, when the first drying drum 11 is in use, the RAP material enters from the feed end of the first drying drum 11, and the first burner 14 is located on the other side of the feed end. The RAP material and the hot air move in opposite directions. The RAP material contacts the hot air multiple times during the movement, so that the RAP material is evenly heated, thereby improving the thermal efficiency of the first drying drum 11; further, when the second drying drum 12 is in use, the RAP material enters from the feed end of the second drying drum 12, and the RAP material and the hot air move in the same direction. During the movement, the hot air is discharged from the feed end together with the moisture of the RAP material. The contact time between the RAP material and the hot air is short, therefore, the thermal efficiency of the second drying drum 12 is lower than that of the first drying drum 11; further, the first combustion chamber 15 is arranged between the first discharge box 13 and the first burner 14; the hot air is evenly mixed in the first drying drum 11 through the first combustion chamber 15.

[0025] The mixing cylinder 18 is arranged on the main building 1, wherein the first storage and metering mechanism 19 is connected to the first discharge box 13 to feed the mixing cylinder 18, and the second storage and metering mechanism 2 is connected to the second discharge box 16 to feed the mixing cylinder 18; by arranging the first storage and metering mechanism 19 cooperating with the first drying drum 11 and the second storage and metering mechanism 2 cooperating with the second drying drum 12, two independent RAP storage and metering systems are formed, so that the first drying drum 11 and the second drying drum 12 can operate independently or in superposition without affecting each other, thereby improving the practicality of the utility model; specifically, the first storage and metering mechanism 19 includes a first hot material bin 24 connected to the first discharge box 13, and a first pass connected to the lower end of the first hot material bin 24. The transition bin 25 and the first metering bin 26 connected between the first transition bin 25 and the mixing tank 18 can solve the problem of excessive material storage height and segregation by arranging the first hot material bin 24 and the first transition bin 25 connected in sequence at the lower end of the first discharge box 13; further, the second storage metering mechanism 2 includes a second hot material bin 27 connected to the second discharge box 16 and a second metering bin 28 connected between the second hot material bin 27 and the mixing tank 18; further, the first metering bin 26 and the second metering bin 28 are relatively arranged above the mixing tank 18; when in use, the recycled material in the first metering bin 26 and the second metering bin 28 automatically falls into the mixing tank 18 using the principle of gravity, without the need to set up additional chute transition, thereby reducing equipment maintenance work.

[0026] The first lifting mechanism 21 is used to feed the first drying drum 11, wherein the second elevator 22 is used to feed the second drying drum 12; specifically, the first lifting mechanism 21 includes a first elevator 29, a first feed box 3 connected to the feed end of the first drying drum 11, and a first feed chute 31 connected to the first elevator 29 to feed the first drying drum 11, one end of the first feed chute 31 is connected to the first elevator 29, and the other end is inclined downward through the first feed box 3 to extend to the feed end of the first drying drum 11; further, the second elevator 22 is provided with a discharge section 32 that is inclined downward to the feed end of the second drying drum 12.

[0027] The finished product bin 23 is provided on the main building 1 and is connected to the discharge port of the mixing tank 18; the finished products after mixing can fall into the finished product bin and be stored for use.

[0028] In summary, with the help of the above technical solution of the present invention, a double-drum structure is realized by arranging the first drying drum 11 and the second drying drum 12 on the main building 1, thereby increasing the production capacity of RAP. At the same time, the first drying drum 11 and the second drying drum 12 are arranged up and down to realize a double-layer structure with a compact structure, which reduces the floor space occupied by the present invention. In addition, the first burner 14 connected to the first discharge box 13 to supply heat to the first drying drum 11 and the second burner 17 connected to the feeding end of the second drying drum 12 are used to respectively realize countercurrent drying and downstream drying of the first drying drum 11 and the different drying and heating requirements of coarse aggregate and fine aggregate, which not only solves the heating and sticking problem of different RAP aggregate gradations, but also improves the gradation stability of the finished asphalt mixture. Qualitative; in addition, the hot air is evenly mixed in the first drying drum 11 by setting a first combustion chamber 15 between the first discharge box 13 and the first burner 14; in addition, by setting a first storage metering mechanism 19 cooperating with the first drying drum 11 and a second storage metering mechanism 2 cooperating with the second drying drum 12, two independent RAP storage metering systems are formed, so that the first drying drum 11 and the second drying drum 12 can operate independently or in superposition without affecting each other, thereby improving the practicality of the utility model; by relatively setting the first metering bin 26 and the second metering bin 28 above the mixing cylinder 18, when in use, the recycled materials in the first metering bin 26 and the second metering bin 28 automatically fall into the mixing cylinder 18 by the principle of gravity, without the need to set an additional chute transition, thereby reducing equipment maintenance work.

[0029] The above description is merely a preferred embodiment of the present invention and therefore cannot be used to limit the scope of implementation of the present invention. In other words, equivalent changes and modifications made according to the scope of application of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A double-drum asphalt mixing plant for RAP heating, characterized by: It includes a main building, a first drying drum arranged on the main building for heating coarse aggregate, a second drying drum arranged on the main building and below the first drying drum for heating fine aggregate, a first discharge box arranged at the discharge end of the first drying drum, a first burner connected to the first discharge box to supply heat to the first drying drum, a second discharge box arranged at the discharge end of the second drying drum, a second burner connected to the feed end of the second drying drum, a mixing tank arranged on the main building, a first storage and metering mechanism connected to the first discharge box to supply material to the mixing tank, and a second storage and metering mechanism connected to the second discharge box to supply material to the mixing tank.

2. The double-drum asphalt mixing plant for RAP heating according to claim 1, characterized in that: The first storage and metering mechanism includes a first hot material bin connected to the first discharge box, a first transition bin connected to the lower end of the first hot material bin, and a first metering bin connected between the first transition bin and the mixing tank.

3. The double-drum asphalt mixing plant for RAP heating according to claim 2, characterized in that: The second storage and metering mechanism includes a second hot material bin connected to the second discharge box and a second metering bin connected between the second hot material bin and the mixing tank.

4. The double-drum asphalt mixing plant for RAP heating according to claim 3, characterized in that: The first metering bin and the second metering bin are arranged opposite to each other above the mixing tank.

5. The double-drum asphalt mixing plant for RAP heating according to claim 1, characterized in that: It also includes a first lifting mechanism that feeds the first drying drum, the first lifting mechanism includes a first elevator, a first feed box connected to the feed end of the first drying drum, and a first feed chute connected to the first elevator to feed the first drying drum, one end of the first feed chute is connected to the first elevator, and the other end is inclined downward and extends through the first feed box to the feed end of the first drying drum.

6. The double-drum asphalt mixing plant for RAP heating according to claim 1, characterized in that: The invention also comprises a second elevator for feeding materials to the second drying drum, wherein the second elevator is provided with a discharge section which is inclined downward to the feeding end of the second drying drum.

7. The double-drum asphalt mixing plant for RAP heating according to claim 1, characterized in that: The invention also includes a first combustion chamber arranged between the first discharge box and the first burner.

8. The double-drum asphalt mixing plant for RAP heating according to claim 1, characterized in that: It also includes a finished product warehouse arranged on the main building and connected to the discharge port of the mixing tank.

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