Asphalt plant-mixing primary regeneration system

Abstract

The utility model discloses an asphalt plant-mixing primary regeneration system which comprises a batching bin, an aggregate conveying mechanism, a drying cylinder, a material metering and stirring mechanism and a mixture storage bin which are communicated in sequence, the batching bin is used for receiving pavement recycled materials and new aggregates; the aggregate conveying mechanism conveys the aggregate to the drying cylinder for drying and heating; the material metering and stirring mechanism comprises a hot mixed material elevator as well as a vibrating screen, a hot aggregate storage bin and a stirrer which are sequentially communicated from top to bottom in the height direction of the hot mixed material elevator; the vibrating screen receives and screens the hot mixed material; the hot aggregate storage bin stores the screened hot aggregate, and the stirrer stirs the screened hot aggregate; and the mixture storage bin is arranged below the stirrer and is used for storing the stirred mixture. According to the utility model, not only can new aggregate be independently processed and produced, but also combined materials of the new aggregate and asphalt pavement reclaimed materials can be processed and produced, and the equipment has powerful functions; the system is intensive in heating process, small in heat loss and high in heat efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of building material production equipment, and more particularly to an asphalt plant mixing raw material regeneration system. Background Art

[0002] Asphalt mixing equipment is a mechanical device used to produce and mix various asphalt mixtures. Asphalt plant hot recycling equipment, based on the asphalt mixing equipment, heats recycled asphalt pavement material and remixes it with a certain amount of new aggregate and new asphalt to produce a recycled asphalt mixture with excellent road performance.

[0003] In traditional asphalt plant hot-mix recycling equipment, the drying and heating process of recycled asphalt pavement materials and new aggregates is completed by two drying drums. The heating process is repeated, resulting in large heat loss and low efficiency. The equipment structure is complex and the cost is high. The regeneration drying drum is arranged at a high position on the top of the mixing building, and the equipment operation stability is poor.

[0004] Some hot-mix recycling equipment at asphalt plants utilizes a single drying drum to heat both the recycled asphalt pavement material and new aggregate. Furthermore, screening and metering of both the recycled asphalt pavement material and new aggregate are performed immediately prior to entering the drying drum, with no further screening or metering required after heating. This process results in low metering accuracy, resulting in a regenerated asphalt mixture with low gradation accuracy, which cannot meet the requirements for high-quality pavement.

[0005] Therefore, how to provide an asphalt plant-mixed virgin regeneration system to optimize the heating process of new aggregates and recycled asphalt pavement materials in the recycled asphalt mixture, reduce equipment costs, and at the same time ensure the grading accuracy of the asphalt mixture is an urgent problem that technicians in this field need to solve. Utility Model Content

[0006] In view of this, the present invention provides an asphalt plant-mixed raw material regeneration system, aiming to solve the above technical problems.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] An asphalt plant mix raw material regeneration system includes a batching bin, a material collection conveying mechanism, a drying drum, a material metering and stirring mechanism, and a mixture storage bin that are sequentially connected;

[0009] There are multiple batching bins, each receiving a road surface recycled material and a new aggregate; the aggregate conveying mechanism mixes the road surface recycled material and the new aggregate and conveys the mixed material to the inner cavity of the drying drum for drying and heating to form a hot mixed material;

[0010] The material metering and mixing mechanism includes a hot mix elevator and a vibrating screen, a hot aggregate bin, and a stirrer that are sequentially connected and arranged along the height direction of the hot mix elevator from top to bottom; the hot mix elevator inlet is connected to the drying drum outlet to lift the hot mix; the vibrating screen receives the hot mix conveyed by the hot mix elevator and screens it to form hot aggregate; the hot aggregate bin stores the hot aggregate, and the stirrer mixes the hot aggregate to form asphalt mixture;

[0011] The mixture storage bin is arranged below the mixer to temporarily store the asphalt mixture.

[0012] The beneficial effect of the above technical solution is that the batching bin is installed with a proportioning method to distribute cold aggregate, the road surface recycled material and new aggregate are transported to the drying drum through the aggregate conveying mechanism for drying and heating, the heated hot mix is ​​lifted by the hot mix elevator, the hot mix enters the vibrating screen and is screened to form hot aggregate and enters the hot aggregate bin, and finally is stirred by the agitator to form asphalt mixture and falls into the mixture storage bin for temporary storage waiting to be transported to the construction site; this technical solution uses a drying drum to heat the road surface recycled material and new aggregate together, and the heated hot mix is ​​screened, which ensures the grading requirements of the asphalt mixture, improves the production quality of the mixture, and meets the use needs of high-quality pavement.

[0013] Preferably, the aggregate conveying mechanism includes an aggregate conveyor, the feed inlet of which is connected to the discharge outlets of the plurality of batching bins, and the discharge outlet of which is connected to the feed inlet of the drying drum. The batching bins feed recycled pavement material and new aggregate according to the batching ratio onto the conveyor belt of the aggregate conveyor, which conveys the cold aggregate (recycled pavement material and new aggregate) to the drying drum, where the cold aggregate is dried and heated.

[0014] Preferably, the aggregate conveying mechanism further includes a pre-mixing mixer and a cold mix conveyor. The feed inlet of the pre-mixing mixer is connected to the discharge outlet of the aggregate conveyor to pre-mix the cold aggregate and form a cold mix. The feed inlet of the cold mix conveyor is connected to the discharge outlet of the pre-mixing mixer, and its discharge outlet is connected to the feed inlet of the drying drum to convey the mixed cold mix to the inner cavity of the drying drum. When the particle size of the cold aggregate varies significantly, the cold aggregate can be stirred by the pre-mixing mixer to form a uniform cold mix, and then conveyed to the drying drum via the cold mix conveyor for drying and heating, thereby improving the mixing quality of the asphalt mixture ultimately produced by the mixer.

[0015] Preferably, the material metering and stirring mechanism further includes a conversion valve, which is fixed at the discharge port of the hot mix elevator. The conversion valve has two channels that are respectively connected to the vibrating screen and the hot aggregate bin. The conversion valve can control the flow direction of the heated hot mix. The conversion valve has a first and a second channel. When the heated hot mix needs to be further screened, the hot mix flows to the first channel and enters the vibrating screen. The vibrating screen screens the hot mix and then enters the hot aggregate bin. When the heated hot mix does not need to be screened, it can directly enter the hot aggregate bin through the second channel. By controlling the flow direction of the hot mix through the conversion valve, accurate materials of various particle sizes can be obtained, and subsequent accurate secondary metering of materials of various particle sizes can be achieved.

[0016] Preferably, a metering system is fixed on the top of the agitator. Materials of various particle sizes obtained through the conversion valve enter the hot aggregate bin and are weighed and measured by the metering system before entering the agitator, which can ensure the mixing quality of the asphalt mixture finally mixed in the agitator.

[0017] Preferably, an asphalt fume processor is fixed to the feed port of the drying drum. When the drying drum heats the aggregate, some asphalt fume is inevitably generated, which is processed by the asphalt fume processor to ensure that the quality of the fume discharged into the air is qualified and to prevent environmental pollution.

[0018] Preferably, the hot mix elevator is a vertical bucket elevator, a scraper conveyor, a bucket inclined elevator or a single bucket elevator.

[0019] Preferably, the drying drum adopts combustion heating or electromagnetic heating.

[0020] It can be seen from the above technical solutions that, compared with the prior art, the utility model discloses an asphalt plant-mixed virgin regeneration system, which can process and produce both pure new aggregate and a combination of new aggregate and asphalt pavement recycled materials, and the equipment has powerful functions; the system's heating process is intensive, with low heat loss and high thermal efficiency; the old asphalt in the recycled material is not prone to high-temperature aging, and the amount of asphalt smoke generated is small; the production process is simplified, the equipment configuration is simplified, and the equipment cost is low; the drying drum is arranged at a low position and placed on the equipment foundation, and the equipment has good operating stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram of the layout of the asphalt plant mix raw regeneration system provided by the utility model;

[0023] Figure 2 This is a schematic diagram of the material metering and stirring mechanism layout provided by the utility model.

[0024] in,

[0025] 1-Ingredients silo;

[0026] 2-aggregate conveying mechanism; 21-aggregate conveyor; 22-premix mixer; 23-cold mix conveyor;

[0027] 3-Drying drum;

[0028] 4-Material metering and mixing mechanism; 41-Hot mix elevator; 42-Conversion valve; 43-Vibrating screen; 44-Hot aggregate silo; 45-Metering system; 46-Agitator;

[0029] 5-Mixture storage silo;

[0030] 6-Asphalt smoke processor. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] See attached Figures 1-2 The embodiment of the utility model discloses an asphalt plant-mixed raw material regeneration system, comprising a batching bin 1, a material collection conveying mechanism 2, a drying drum 3, a material metering and stirring mechanism 4 and a mixture storage bin 5 which are sequentially connected;

[0033] There are multiple batching bins 1, each receiving recycled road material and new aggregate. The aggregate conveying mechanism 2 mixes the recycled road material and new aggregate and conveys them to the inner cavity of the drying drum 3 for drying and heating to form a hot mix.

[0034] The material metering and mixing mechanism 4 includes a hot mix elevator 41 and a vibrating screen 43, a hot aggregate bin 44, and a stirrer 46, which are sequentially connected and arranged along the height direction of the hot mix elevator 41 from top to bottom. The inlet of the hot mix elevator 41 is connected to the outlet of the drying drum 3 to lift the hot mix. The vibrating screen 43 receives the hot mix conveyed by the hot mix elevator 41 and screens it to form hot aggregate. The hot aggregate bin 44 stores the hot aggregate, and the stirrer 46 mixes the hot aggregate to form an asphalt mixture.

[0035] The mixture storage bin 5 is provided below the mixer 46 to temporarily store the asphalt mixture.

[0036] like Figure 1 As shown, the batching bin contains recycled pavement materials and new aggregates, which are automatically controlled by the EPC control system of the asphalt mixing system according to the mix ratio. The batching bin puts recycled pavement materials and new aggregates according to the quantity requirements of the mix ratio and transports them through the aggregate conveying mechanism. The aggregate conveying mechanism transports the recycled pavement materials and new aggregates to the drying drum for drying and heating to form a hot mix. The hot mix is ​​lifted by the hot mix elevator. The hot mix is ​​sieved by the vibrating screen to obtain precise hot aggregates of various particle sizes and falls into the hot aggregate bin. The hot aggregate in the hot aggregate bin falls into the agitator for mixing to form an asphalt mixture. The mixed asphalt mixture finally falls into the mixture storage bin for temporary storage. When needed, it can be pulled to the construction site by a double-load truck for paving operations.

[0037] In this embodiment, depending on the actual construction needs, the batching silo can hold fresh aggregate alone for producing new asphalt, or it can hold recycled road material and fresh aggregate separately for hot-mix regeneration at the asphalt plant. The batching silo includes a belt scale, position sensor, metering sensor, and speed sensor. The aggregates (recycled road material and fresh aggregate) are accurately measured and proportioned by the belt scale, position sensor, metering sensor, and speed sensor before being transported via the aggregate conveyor.

[0038] In some other specific embodiments, the batching bin also includes a metering bin, and the metering bin includes a metering sensor; after the aggregate passes through the metering bin, it goes from the batching bin to the aggregate conveying mechanism; the aggregate conveying mechanism includes a belt scale, a position sensor, and a speed sensor. The aggregate conveying mechanism measures and conveys the aggregate through the belt scale, the speed sensor, and the position sensor. The belt scale, the speed sensor, and the position sensor can adjust the conveying speed and the delivery drop point of the aggregate conveying mechanism.

[0039] In order to further optimize the above technical solution and ensure the aggregate conveying effect, the aggregate conveying mechanism 2 includes an aggregate conveyor 21, the feed port of the aggregate conveyor 21 is connected to the discharge ports of multiple material distribution bins 1, and the discharge port of the aggregate conveyor 21 is connected to the feed port of the drying drum 3.

[0040] To further optimize the above technical solution, the aggregate conveying mechanism 2 further includes a pre-mixer 22 and a cold mix conveyor 23. The inlet of the pre-mixer 22 is connected to the outlet of the aggregate conveyor 21 to pre-mix the cold aggregate and form a cold mix. The inlet of the cold mix conveyor 23 is connected to the outlet of the pre-mixer 22, and its outlet is connected to the inlet of the drying drum 3 to convey the mixed cold mix to the inner cavity of the drying drum 3. The road recycled material and new aggregate are mixed by the pre-mixer to form a uniform cold mix, which is then dried and heated in the drying drum to form a hot mix.

[0041] According to the project requirements and raw material conditions, the cold aggregate dropped from the batching bin according to the proportion can be directly transported to the drying drum without going through the pre-mixing mixer, which simplifies the process and improves the work efficiency.

[0042] In order to further optimize the above technical solution, control the flow direction of the hot mix, and accurately obtain materials of various particle sizes, the material metering and stirring mechanism 4 also includes a conversion valve 42, which is fixed to the discharge port of the hot mix elevator 41. The conversion valve 42 has two channels and is respectively connected to the vibrating screen 43 and the hot aggregate bin 44.

[0043] The switching valve is located at the outlet of the hot mix elevator and controls the flow direction of the hot mix. Hot mix that requires secondary screening flows to the first channel of the switching valve, while hot mix that does not require secondary screening flows to the second channel of the screening switching valve.

[0044] The vibrating screen is located at the discharge port of the conversion valve. The hot mixed material entering the first channel of the conversion valve falls into the screening area of ​​the vibrating screen for secondary screening, obtaining accurate materials of various particle sizes, which can realize the subsequent accurate measurement of materials of various particle sizes; the hot mixed material entering the second channel of the conversion valve directly enters the hot aggregate silo, eliminating the secondary screening process and improving production efficiency.

[0045] In order to further optimize the above technical solution and achieve accurate metering of the hot mixed material, a metering system 45 is fixed on the top of the stirrer 46.

[0046] In order to further optimize the above technical solution and ensure that the cold mix drying and heating process is more environmentally friendly, an asphalt fume processor 6 is fixed to the feed port of the drying drum 3 .

[0047] In order to further optimize the above technical solution, the drying drum 3 adopts combustion heating or electromagnetic heating. When combustion heating is adopted, it is divided into downstream heating or countercurrent heating.

[0048] When the drying drum is a downstream heating drying drum, it includes a burner, a feed head, a cylinder, a W-shaped guide plate, a bridge-type anti-segregation device, a discharge head, a dust removal system and pipelines, a frame, a transmission device, and a heating and heat preservation device; the raw materials are fed into the drying drum through the feed head. Due to the rotation and inclination of the drying drum, the raw materials move toward the lower end. The guide plate is used to sprinkle the raw materials to form a uniform material curtain. The burner is used to provide hot air to the sprinkled material curtain. The bridge-type anti-segregation device is used to prevent large-particle raw materials from segregating from small-particle raw materials. The discharge head is used to discharge the heated raw materials. The pipeline and dust removal system are used to collect dust and harmful smoke during the raw material heating process.

[0049] When the drying drum is a countercurrent heating drying drum, it includes a feed head, a cylinder, a guide plate, a bridge-type anti-segregation device, a discharge head, a hot air furnace, an asphalt flue gas secondary circulation duct, a burner, a frame, a transmission device, a dust removal system and pipelines, air duct valves, and a heating and heat preservation device; the raw materials are fed into the drying drum through the feed head. Due to the rotation and inclination of the drying drum, the raw materials move toward the lower end. The guide plate is used to sprinkle the raw materials to form a uniform material curtain. The burner and the hot air furnace are used to provide hot air to the material curtain. During the movement of the raw materials toward the lower end, the bridge-type anti-segregation device is used to prevent segregation of large-size aggregate and small-size aggregate; the discharge head is used to output the heated raw materials, and the dust removal system and pipeline are used to collect dust during the heating process of the raw materials.

[0050] In order to further optimize the above technical solution, the hot mix elevator 41 is a vertical bucket elevator, a scraper conveyor, a bucket inclined elevator or a single bucket elevator.

[0051] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0052] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An asphalt plant mix primary regeneration system, characterized in that: It comprises a batching bin (1), a material collection conveying mechanism (2), a drying drum (3), a material metering and stirring mechanism (4) and a mixed material storage bin (5) which are connected in sequence; The batching bins (1) are multiple and receive the road surface recycled material and new aggregate respectively; the aggregate conveying mechanism (2) mixes the road surface recycled material and the new aggregate and conveys them to the inner cavity of the drying drum (3) for drying and heating to form a hot mixed material; The material metering and stirring mechanism (4) comprises a hot mix elevator (41) and a vibrating screen (43), a hot aggregate bin (44) and a stirrer (46) which are sequentially connected and arranged along the height direction of the hot mix elevator (41) from top to bottom; the inlet of the hot mix elevator (41) is connected to the outlet of the drying drum (3) to lift the hot mix; the vibrating screen (43) receives the hot mix conveyed by the hot mix elevator (41) and screens it to form hot aggregate; The hot aggregate bin (44) stores the hot aggregate, and the mixer (46) mixes the hot aggregate to form an asphalt mixture; The mixture storage bin (5) is arranged below the agitator (46) to temporarily store the asphalt mixture.

2. The asphalt plant mix regeneration system according to claim 1, characterized in that: The collecting and conveying mechanism (2) comprises a collecting conveyor (21), the feeding port of the collecting conveyor (21) is connected to the feeding ports of the plurality of the batching bins (1), and the feeding port of the collecting conveyor (21) is connected to the feeding port of the drying drum (3).

3. The asphalt plant mix regeneration system according to claim 2, characterized in that: The aggregate conveying mechanism (2) further comprises a pre-mixing mixer (22) and a cold mix conveyor (23), wherein the inlet of the pre-mixing mixer (22) is connected to the outlet of the aggregate conveyor (21) to pre-mix the cold aggregate and form a cold mix; the inlet of the cold mix conveyor (23) is connected to the outlet of the pre-mixing mixer (22), and its outlet is connected to the inlet of the drying drum (3) to convey the mixed cold mix to the inner cavity of the drying drum (3).

4. The asphalt plant mix regeneration system according to claim 1, characterized in that: The material metering and stirring mechanism (4) further comprises a conversion valve (42), which is fixed to the discharge port of the hot mixed material elevator (41). The conversion valve (42) has two channels and is respectively connected to the vibrating screen (43) and the hot aggregate bin (44).

5. The asphalt plant mix regeneration system according to claim 4, characterized in that: A metering system (45) is fixed on the top of the stirrer (46).

6. The asphalt plant mix regeneration system according to claim 1, characterized in that: An asphalt fume processor (6) is fixed to the feed inlet of the drying cylinder (3).

7. The asphalt plant mix regeneration system according to claim 1, characterized in that: The hot mixed material elevator (41) is a vertical bucket elevator, a scraper conveyor, a bucket inclined elevator or a single bucket elevator.

8. The asphalt plant mix regeneration system according to claim 1, characterized in that: The drying drum (3) adopts combustion heating or electromagnetic heating.

Images