Separating device for asphalt and aggregate in asphalt milling material

Abstract

A separation device for asphalt and aggregate in asphalt milling materials belongs to the technical field of road engineering materials, and adopts the following specific scheme that the separation device for the asphalt and the aggregate in the asphalt milling materials comprises a material supply bin, a crushing bin, a coolant supply device, a compressor and screening equipment, a feeding control plate is arranged at the communicating position of the feeding bin and the crushing bin, snakelike cooling pipelines are arranged on the inner side walls of the feeding bin and the crushing bin correspondingly, one end of each cooling pipeline communicates with a coolant supply device, the other end of each cooling pipeline communicates with a compressor, the compressor communicates with the coolant supply device, and stirring wheels are arranged in the feeding bin and the crushing bin correspondingly. The screening equipment is arranged below the crushing bin, and a discharging control plate is arranged between a feeding port of the screening equipment and the crushing bin. According to the utility model, the purposes of eliminating'false particle size 'to the greatest extent and fully stripping asphalt adhered to the surface of the existing aggregate are achieved, so that the uniformity of the regenerated mixture is improved, and the purpose of improving the pavement performance index is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to road engineering material technical field, concretely relates to a separation device of asphalt and aggregate in asphalt milling material. BACKGROUND

[0002] Asphalt milling material refers to the mixture produced by milling old asphalt pavement through a milling machine during road maintenance or reconstruction. Asphalt milling material is mainly composed of asphalt and aggregate. In the process of pavement recycling, it is necessary to separate asphalt and aggregate as much as possible to meet higher standards of road performance.

[0003] If asphalt and aggregate in the milling material cannot be completely separated, it will limit its application range in road construction. Too much old asphalt will make the recycled mixture too soft, reduce its deformation resistance and bearing capacity, and make the recycled mixture performance unstable, making it difficult to pave and compact, affecting its adhesion and durability.

[0004] Currently, the traditional separation methods mainly include mechanical screening, solvent separation, and thermal separation. The above methods have the disadvantages of high separation cost, poor environmental friendliness, low separation efficiency, and poor separation quality, which seriously affect the recycling quality. Generally, the milling material separated by traditional technology has two factors affecting the recycling performance. One is the "false particle size" problem. In the process of milling material separation, due to the lack of crushing power, fine aggregate is attached to the surface of coarse aggregate or combined with other fine aggregate to form a ball. The second is the old asphalt layer on the surface of the aggregate, which cannot be fused with new asphalt. At the same time, in the production and processing engineering, the milling material is stored in an environment with a temperature higher than 30℃ for a long time, which will cause the milling material to stick together. The traditional separation equipment will appear the phenomenon of clogging the screen hole, and the "false particle size" problem will be aggravated. UTILITY MODEL CONTENT

[0005] In order to solve the problem that asphalt and aggregate in the milling material cannot be fully separated in the prior art, the utility model provides a separation device of asphalt and aggregate in asphalt milling material, which has the characteristics of low separation cost and strong operability.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] The utility model provides a kind of asphalt milling material separation device of asphalt and aggregate, including feed bin, crushing bin, coolant supply device, compressor and screening equipment, the feed bin is located above crushing bin and is communicated with crushing bin, the feed bin and the communication of crushing bin is provided with feed control board,'snake' cooling pipeline is uniformly arranged on the inner side wall of the feed bin and crushing bin, the inlet of two cooling pipelines is communicated with coolant supply device, outlet is communicated with compressor, the compressor is communicated with coolant supply device, stirring wheel is rotatably arranged in the feed bin and crushing bin, the screening equipment is arranged below crushing bin, and discharge control board is arranged between the feed inlet of screening equipment and the discharge outlet of crushing bin.

[0008] Further, the screening equipment is graded and screened, and each grade discharge outlet is communicated with a plurality of storage bins.

[0009] Further, the outlet of the coolant supply device is communicated with the inlet of the two cooling pipelines through a liquid delivery pipeline.

[0010] Further, a switch control valve is arranged at the outlet of the coolant supply device, and the outlet of the liquid delivery pipeline is communicated with the inlet of the two cooling pipelines through a flow rate separation control valve.

[0011] Further, the compressor is communicated with the outlet of the two cooling pipelines through a backflow pipeline.

[0012] Further, the outlet of the two cooling pipelines is communicated with a liquid storage tank with a backflow pressure control valve, and the liquid storage tank is communicated with the backflow pipeline.

[0013] Further, the outer side wall of the feed bin and the crushing bin is provided with a thermal insulation layer, and the thickness of the thermal insulation layer is 5-10 cm.

[0014] Further, the stirring wheel includes an axle and 4-6 beating plates, and the beating plates are fixedly arranged on the axle and symmetrically arranged.

[0015] Further, a temperature sensor is arranged in the feed bin and the crushing bin.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The utility model utilizes the physical properties that asphalt will be in a glass state at low temperature and its brittleness will significantly increase, and the principle of liquid nitrogen rapid cooling at room temperature, to rapidly cool the milling material at a high outdoor ambient temperature, so that the asphalt is in a glass state. When the milling material at low temperature is impacted and vibrated by the outside world, the asphalt adhered to the surface of the milling material can be fully separated from the aggregate.

[0018] The asphalt and aggregate separating device of the asphalt milling material has the characteristics of simple operation, convenience, low production and processing cost, easy separation of asphalt and aggregate, and the purpose of fully stripping the asphalt adhered to the surface of the existing aggregate is achieved, the uniformity of the recycled mixture is improved, and the purpose of improving the road performance index is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the overall structure schematic diagram of the asphalt and aggregate separating device of the asphalt milling material;

[0020] Figure 2 is the overall cooling agent flow channel distribution diagram of the asphalt and aggregate separating device of the asphalt milling material;

[0021] Figure 3 is the structure schematic diagram of the feeding bin;

[0022] Figure 4 is the structure schematic diagram of the crushing bin;

[0023] In the figure, 1 is a feeding bin, 2 is a crushing bin, 3 is a cooling agent supply device, 4 is a compressor, 5 is a screening device, 6 is a feeding control plate, 7 is a cooling pipeline, 8 is a stirring wheel, 9 is a discharging control plate, 10 is a storage bin, 11 is a liquid conveying pipeline, 12 is an on-off control valve, 13 is a flow rate separation control valve, 14 is a backflow pipeline, 15 is a backflow pressure division control valve, and 16 is a liquid storage tank. DETAILED DESCRIPTION

[0024] The technical solutions in the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0025] Embodiment 1

[0026] The utility model makes use of the physical characteristics of asphalt material in a glass state under low temperature conditions, rapidly cools the asphalt milling material by using high-efficiency cooling agent, and the asphalt in a glass state under a low temperature condition below-25 DEG C will become hard and brittle, so that the asphalt on the surface of RAP is easy to separate out in the mechanical stripping process. The asphalt particle size after mechanical beating is generally less than 2.36 mm, the recycled material after stripping is stored according to the particle size by a specific screening process through graded screening, and the purpose of fully separating the asphalt and aggregate in the milling material is achieved.

[0027] As shown in the accompanying drawings Figures 1-4The separation device of asphalt and aggregate in asphalt milling material is shown in the figure:

[0028] The separation device of asphalt and aggregate in asphalt milling material comprises a feeding bin 1, a crushing bin 2, a coolant supply device 3, a compressor 4 and a screening device 5. The feeding bin 1 is located above the crushing bin 2 and communicates with the crushing bin 2. A feeding control plate 6 is arranged at the communication position of the feeding bin 1 and the crushing bin 2 to control the feeding speed. A'snake' shaped cooling pipeline 7 is arranged on the inner wall of the feeding bin 1 and the crushing bin 2. The inlet of the two cooling pipelines 7 communicates with the coolant supply device 3, and the outlet thereof communicates with the compressor 4. The compressor 4 communicates with the coolant supply device 3. A stirring wheel 8 is arranged in the feeding bin 1 and the crushing bin 2. The screening device 5 is arranged below the crushing bin 2. A discharging control plate 9 is arranged between the feeding inlet of the screening device 5 and the discharging outlet of the crushing bin 2 to control the discharging speed. The opening and closing degree of the feeding control plate 6 and the discharging control plate 9 is controlled manually or by circuit.

[0029] Preferably, the coolant is liquid nitrogen.

[0030] Further, the discharging outlet of each grade of the screening device 5 corresponds to a plurality of storage bins 10. Different storage bins 10 store materials with different particle sizes. The screening device 5 is a device with the function of screening materials with different particle sizes in the prior art.

[0031] Further, the outlet of the coolant supply device 3 communicates with the inlets of the two cooling pipelines 7 through a liquid conveying pipeline 11. A switch control valve 12 is arranged at the outlet of the coolant supply device 3. The outlet of the liquid conveying pipeline 11 communicates with the inlets of the two cooling pipelines 7 through a flow rate separation control valve 13. The separation control valve 13 is a standard part which can control the flow rate of liquid and separate the liquid, so that liquid nitrogen is supplied into the two cooling pipelines 7 to reduce the temperature of the feeding bin 1 and the crushing bin 2.

[0032] Further, the compressor 4 communicates with the outlets of the two cooling pipelines 7 through a backflow pipeline 14.

[0033] Further, the outlets of the two cooling pipelines 7 communicate with a liquid storage tank 16 with a backflow pressure control valve 15. The liquid storage tank 16 communicates with the backflow pipeline 14. That is, the two cooling pipelines 7 communicate with the liquid storage tank 16 through the backflow pressure control valve 15. The backflow pressure control valve 15 is a standard part.

[0034] Further, the outer side wall of the feeding bin 1 and the crushing bin 2 is provided with a heat preservation layer. The thickness of the heat preservation layer is 5-10 cm. The inside of the feeding bin 1 and the crushing bin 2 is provided with a temperature sensor for measuring the temperature inside the feeding bin 1 and the crushing bin 2. The temperature sensor is a conventional electronic element, which is controlled by an electric circuit and displays the temperature inside the bin.

[0035] Further, the stirring wheel 8 comprises a wheel shaft and 4-6 beating plates which are fixedly arranged on the wheel shaft and are in a symmetrical structure.

[0036] The utility model utilizes high-efficiency liquid-gas conversion coolant liquid nitrogen, which is circulated through the liquid conveying pipeline 11, the cooling pipeline 7, the backflow pipeline 14 and the compressor 4, realizes the rapid cooling of the asphalt milling material in the feeding bin 1 and the crushing bin 2, and realizes the glass state conversion of asphalt by reducing the asphalt milling material to below-25 DEG C.

[0037] The weight of the coolant liquid nitrogen is controlled by the switch control valve 12 and the flow rate separation control valve 13, the accurate temperature control of the milling material with different weights is realized, the constant temperature control of the pre-cooling feeding bin 1 and the crushing bin 2 is realized by the flow rate control valve 13, and the asphalt milling material meets the low-temperature crushing environment temperature condition. Because the volume of the coolant increases during the cooling process, the liquid storage tank 16 with the backflow pressure control valve 15 is arranged, the safe backflow of the coolant is ensured, and the backflow coolant is converted into liquid by the compressor 4 and recycled.

[0038] The circulating weight of the coolant is calculated according to the following formula:

[0039] m 冷却剂 =(m 铣刨料 ×c×ΔT) / L

[0040] m 冷却剂 is the mass of the liquid nitrogen coolant, m 铣刨料 is the mass of the asphalt milling material, c is the specific heat capacity of the asphalt milling material, ΔT is the temperature change, and L is the latent heat energy.

[0041] For example, the milling material is 1000 kg, the specific heat capacity is 800 J / (kg·K), the temperature is reduced from 10 DEG C to-30 DEG C, the latent heat of the liquid nitrogen is generally 199000 J / kg, and then the weight of the coolant required is:

[0042] m coolant =1000x800x(10-(-30)) / 199000=16.08 kg.

[0043] The feeding bin 1 plays a role in pre-cooling the asphalt milling material, and meanwhile, on-demand feeding can be realized according to the crushing requirement of the crushing bin 2. The feeding bin 1 is made of steel.

[0044] The asphalt milling material contains moisture, and rapid cooling causes the water-containing asphalt milling material particles to form clusters. The supply bin 1 is provided with a stirring wheel 8 to preliminarily crush the frozen and clustered asphalt milling material. At the same time, a feeding control plate 6 is provided to realize on-demand feeding of the crushing bin 2. The volume of the supply bin 1 should be not less than 1.5 times the effective volume of the crushing bin 2.

[0045] The crushing bin 2 functions to separate and crush. A plate-type counter-attack crushing process is adopted, and the stirring wheel 8 includes 4-6 attack plates. Through the steel plates fixed in the bin, vibration attack is simulated to realize the separation of the glassy asphalt on the surface of the milling material from the stone under low-temperature conditions into small asphalt particles with a particle size of less than 2.36 mm. The crushing bin 2 is made of steel material. The crushing bin 2 realizes the control of the crushing energy by controlling the rotating speed of the attack plates of the stirring wheel 8.

[0046] The rotating speed of the attack plates of the stirring wheel 8 realizing the control of the crushing energy is represented by the following formula,

[0047]

[0048] v 击打板 is the rotating speed of the attack plates of the stirring wheel 8, m 铣刨料 is the mass of the crushed asphalt milling material, and E is the crushing energy.

[0049] For example, for 1000 kg of milling material, the asphalt milling material separation energy is not less than 128000 J, and the rotating speed of the attack plates of the stirring wheel 8 realizing the crushing energy is:

[0050] v 击打板 =(2×128000 / 1000) 1 / 2 = 16 m / s.

[0051] In the grading and screening device 5, 3-5 grades of screens are set according to the milling conditions. Linear vibration linear screening is adopted to separate the recovered material after stripping to store according to the particle size. After grading, the asphalt content of 0-2.36 mm is not less than 80%.

[0052] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. The description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A device for separating asphalt and aggregate in asphalt milling mix, characterized in that: The application relates to a material feeding device, which comprises a feeding bin (1), a crushing bin (2), a coolant supply device (3), a compressor (4) and a screening device (5), wherein the feeding bin (1) is arranged above the crushing bin (2) and communicates with the crushing bin (2), a feeding control plate (6) is arranged at the communication position of the feeding bin (1) and the crushing bin (2),'snake' shaped cooling pipes (7) are arranged on the inner walls of the feeding bin (1) and the crushing bin (2), the liquid inlet ends of the two cooling pipes (7) communicate with the coolant supply device (3), the liquid outlet ends of the two cooling pipes (7) communicate with the compressor (4), the compressor (4) communicates with the coolant supply device (3), stirring wheels (8) are rotatably arranged in the feeding bin (1) and the crushing bin (2), and the screening device (5) is arranged below the crushing bin (2), a discharging control plate (9) is arranged between the feeding inlet of the screening device (5) and the discharging outlet of the crushing bin (2).

2. A device for separating asphalt from aggregate in asphalt milling material according to claim 1, characterized in that: The discharging outlets of the screening device (5) correspond to a plurality of storage bins (10).

3. The device for separating asphalt from aggregate in asphalt milling material according to claim 1, characterized in that: The liquid outlet of the coolant supply device (3) communicates with the liquid inlet ends of the two cooling pipes (7) through a liquid conveying pipe (11).

4. A device for separating asphalt from aggregate in asphalt milling material according to claim 3, characterized in that: A switch control valve (12) is arranged at the liquid outlet of the coolant supply device (3), and the liquid outlet end of the liquid conveying pipe (11) communicates with the liquid inlet ends of the two cooling pipes (7) through a flow rate separation control valve (13).

5. The device for separating asphalt from aggregate in asphalt milling material according to claim 1, characterized in that: The compressor (4) communicates with the liquid outlet ends of the two cooling pipes (7) through a backflow pipe (14).

6. A device for separating asphalt from aggregate in asphalt milling material according to claim 5, characterized in that: The liquid outlet ends of the two cooling pipes (7) communicate with a liquid storage tank (16) provided with a backflow pressure separation control valve (15), and the liquid storage tank (16) communicates with the backflow pipe (14).

7. The device for separating asphalt from aggregate in asphalt milling material according to claim 1, characterized in that: The outer walls of the feeding bin (1) and the crushing bin (2) are provided with heat preservation layers.

8. A device for separating asphalt from aggregate in asphalt milling material according to claim 7, characterized in that: The thickness of the heat preservation layer is 5-10 cm.

9. The device for separating asphalt from aggregate in asphalt milling material according to claim 1, characterized in that: The stirring wheel (8) comprises an axle and 4-6 beating plates, the beating plates are fixedly arranged on the axle and are symmetrically arranged.

10. The device for separating asphalt from aggregate in asphalt milling material according to claim 1, characterized in that: Temperature sensors are arranged in the feeding bin (1) and the crushing bin (2).

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