RAP fine separation equipment

Abstract

The utility model belongs to the technical field of road engineering materials, and relates to processing of old asphalt pavement milling materials, in particular to RAP fine separation equipment. The equipment comprises a new aggregate supply device, a first separation main machine, a first screening device, a lifting conveyor, an RAP supply device, a second separation main machine and a second screening device. According to the equipment, RAP is separated into lean oil coarse aggregate and rich oil fine aggregate through a physical method, the lean oil coarse aggregate has the same specification as a new aggregate, the content of residual asphalt is greatly reduced, false particles are eliminated, and the lean oil coarse aggregate and the new aggregate can be heated by adopting the same original roller of an asphalt mixing station. The residual asphalt content of the oil-rich fine aggregate can be controlled at the maximum value that adhesion is not generated when the high-position roller of the asphalt mixing station is heated, and the high-position roller of the asphalt mixing station is independently used for heating the oil-rich fine aggregate. The use method of the RAP fine separation equipment has the characteristics of simplicity and convenience in operation and low production and processing cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of road engineering materials, relates to a processing method for old asphalt pavement milling material, and in particular to a RAP fine separation device. Technical Background

[0002] The recycling technology of old asphalt pavement milling material (hereinafter referred to as: RAP) has been vigorously promoted and applied because it can save raw materials such as asphalt and sand and gravel, and is conducive to the treatment of waste materials and environmental protection, with significant economic and social environmental benefits. At present, there are four main technologies for the recycling of RAP at home and abroad: factory-mixed hot recycling, on-site hot recycling, factory-mixed cold recycling, and on-site cold recycling. The factory-mixed hot recycling technology is a recycling technology that can achieve the recovery of the performance of aged asphalt in RAP, the graded utilization of aggregates, and the relatively uniform performance of the recycled mixture.

[0003] At present, the traditional factory-mixed hot recycling technology is to simply crush RAP and screen it into three grades of materials: 0-5mm, 5-10mm and above 10mm. The three grades of materials are simultaneously heated to 120-140℃ by the high-position drum of the asphalt mixing station, and then mixed with new aggregate, new asphalt, regeneration agent, etc. at a specific temperature and time in a certain proportion to obtain recycled asphalt mixture. However, the general addition ratio of RAP is below 30%, and the quality is unstable, the use grade is low, and the construction process is mainly controlled by experience, which affects the utilization value of the recycled materials and the economic benefits are not objective. The main reasons are: on the one hand, each level of RAP after traditional crushing and screening is still a mixture of old asphalt and old aggregate, and there are still a large number of fine aggregate agglomerates (commonly known as: false particles or false large particles or false particle sizes), which are neither aggregates nor asphalt. The material state is extremely unstable. When a large proportion is added, the volatility of the grading and oil-stone ratio of the recycled mixture is far beyond the allowable range, and the comprehensive performance of the mixture is not good; on the other hand, the old asphalt content in each level of RAP after traditional crushing and screening is high, and when the temperature is heated in the high-position drum, the old asphalt content is too high. When the softening point of aged asphalt is exceeded, it is very easy for RAP to stick to the high roller. The higher the temperature, the more obvious the adhesion is. Therefore, the heating temperature is generally 40-50°C different from the temperature required for the finished recycled mixture. Fresh aggregate needs to be heated to a higher temperature to compensate, but the compensation of fresh aggregate is not unlimited. Fresh aggregate is prone to disintegration after reaching a certain temperature. In addition, various levels of RAP, new aggregate, new asphalt and regeneration agent are mixed together in the mixing pot of the asphalt mixing station. The regeneration agent is directly added to the product of the mixture of new aggregate and old material. A large part of it is adsorbed and absorbed by the new aggregate, and cannot play a role in regenerating the aged asphalt, resulting in a decrease in the effective utilization rate of the regeneration agent and an increase in the production cost of the recycled asphalt mixture.

[0004] Based on the above reasons, the core reason why the RAP addition ratio in traditional factory-mixed hot recycling is not high lies in the material state of RAP. Specifically, the coarse aggregate (RAP larger than 5mm) crushed and screened has a large amount of residual asphalt, a high content of false particles and unstable grading. Specifically, the fine aggregate (RAP less than or equal to 5mm) crushed and screened has a large amount of residual asphalt, which makes it impossible to solve the adhesion problem when high-position roller heating is used. Specifically, it is because the crushed and screened materials of each grade of RAP can only rely on the high-position roller heating of the asphalt mixing station, the heating method is single and the heating temperature is not high, which makes it impossible for the new aggregate to meet the temperature required for supplementation when a high proportion is added. Utility Model Content

[0005] In order to solve the problems of low RAP addition ratio, unstable quality of recycled mixture and high cost of recycled mixture in the current factory-mixed hot recycling technology, the utility model has developed a RAP old asphalt pavement milling material fine separation equipment based on the mechanism analysis of influencing factors. This equipment separates RAP into oil-poor coarse aggregate and oil-rich fine aggregate by physical methods. The oil-poor coarse aggregate has the same specifications as the new aggregate, and the residual asphalt content is greatly reduced, eliminating the existence of false particles. It can be heated with the same asphalt mixing station original drum as the new aggregate. The residual asphalt content of the oil-rich fine aggregate can be controlled to the maximum value without adhesion when the high-position drum of the asphalt mixing station is heated. The high-position drum of the asphalt mixing station is used alone to heat the oil-rich fine aggregate, which is simple and convenient to operate and has low production and processing costs.

[0006] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] A RAP fine separation device comprises the following devices: a new aggregate supply device, a first separation host, a first screening device, a lifting conveyor, a RAP supply device, a second separation host, and a second screening device;

[0008] The new aggregate supply device includes a new aggregate hopper and a first feeder; the feed port of the first separation host is connected to the first feeder, and the discharge port of the first separation host is connected to the first screening device; the first screening device includes a first discharge port and a second discharge port;

[0009] The RAP supply device includes a RAP hopper and a second feeder; the feed port of the second separation host is connected to the second feeder, and the discharge port of the second separation host is connected to the second screening device; the second screening device includes a third discharge port, a fourth discharge port, a fifth discharge port and a sixth discharge port; the sixth discharge port is connected to the feed port of the first separation host through a lifting conveyor;

[0010] Furthermore, the new aggregate hopper is provided with an aggregate anti-blocking device;

[0011] Further, the first feeder is a vibrating feeder;

[0012] Further, the first separation host is a roll crusher or an impact crusher;

[0013] Furthermore, the first screening device is a high-frequency vibrating screen or a relaxation screen;

[0014] Furthermore, the screen of the first screening device is an anti-blocking screen;

[0015] Furthermore, the first screening device screens the material into two grades: 0-3 mm and 3-5 mm;

[0016] Further, the RAP hopper is provided with an anti-blocking device;

[0017] Furthermore, the second feeder is a vibrating feeder;

[0018] Furthermore, the second separation host is an impact crusher;

[0019] Furthermore, the second screening device is a high-frequency vibrating screen or a relaxation screen;

[0020] Furthermore, the screen of the second screening device is made of high wear-resistant steel;

[0021] Furthermore, the second screening device screens the material into three grades: 5-10 mm, 10-15 mm and above 15 mm;

[0022] Furthermore, the lifting and feeding machine is a chain bucket type lifting machine;

[0023] Furthermore, it also includes a storage device for five grades of materials including 0-3mm, 3-5mm, 5-10mm, 10-15mm and above 15mm for fine separation of finished materials.

[0024] Compared with the prior art, the RAP fine separation equipment developed by the utility model has the following beneficial effects:

[0025] (1) RAP passes through the second stripping machine, and through the combined forces of mutual collision, friction, and beating of the materials in the stripping machine, the asphalt film on the surface of the coarse aggregate larger than 5 mm in the RAP is separated from the aggregate, which greatly reduces the residual asphalt content and eliminates the existence of false particles. Therefore, on the one hand, the gradation of the finely divided coarse aggregate is the same as that of the new aggregate, which solves the technical pain point of the traditional technology that the greater the proportion of RAP added, the greater the fluctuation of the gradation and oil-stone ratio of the recycled mixture; on the other hand, the significant reduction of the residual asphalt content of the finely divided coarse aggregate can be heated in the same way as the new aggregate, which solves the difficulty of the traditional technology that the original roller heating cannot be used due to the large residual asphalt content of RAP. When the finely divided coarse aggregate is added in large quantities, there is no need for temperature compensation with the new aggregate;

[0026] (2) 0-5mm RAP material and new aggregate enter the first stripping machine at the same time. Through the combined forces of mutual collision, friction, and beating of the materials in the stripping machine, the asphalt film on the surface of the 3-5mm coarse aggregate in the RAP can be further separated from the aggregate. At the same time, a part of the new aggregate is cleverly introduced into the RAP. On the one hand, the contact area between the 3-5mm coarse aggregate and the new aggregate without residual asphalt content is increased, which helps to quickly separate the asphalt film from the surface of the old aggregate; on the other hand, the residual asphalt content in the 0-3mm total material is greatly reduced, so that when the 0-3mm fine material is heated by the high-position drum of the asphalt mixing station, due to the low asphalt content, there is no adhesion phenomenon at high temperature, eliminating the difficulty of temperature compensation for new materials in traditional technology;

[0027] (3) Due to the low residual asphalt content in each grade of finely divided coarse aggregate, according to the requirements of the "Technical Specifications for Highway Asphalt Pavement Regeneration", there is no need to use a regeneration agent to restore the asphalt performance. Therefore, in the process of producing recycled asphalt mixture, only the 0-3mm finely divided fine aggregate needs to be restored to perform asphalt performance restoration, which can significantly reduce the use of high-cost regeneration agents. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 This is a schematic structural diagram of the RAP fine separation equipment provided by the utility model.

[0030] In the figure: 1. New aggregate; 2. New aggregate hopper; 3. First feeder; 4. First separation host; 5. First screening device; 6. First discharge port; 7. Second discharge port; 8. 0-3mm fine material; 9. 3-5mm fine material; 10. Lifting conveyor; 11. RAP material; 12. RAP hopper; 13. Second feeder; 14. Second separation host; 15. Third discharge port; 16. Fourth discharge port; 17. Fifth discharge port; 18. Sixth discharge port; 19. Second screening device; 20. 5-10mm fine material; 21. 10-15mm fine material; 22. Fine material above 15mm. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in combination with the embodiment of the utility model and the accompanying drawings. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the use of "first", "second" and similar words does not indicate any order, quantity or importance, but is only used to distinguish different components. The use of "above" means that the specification is greater than or equal to a certain value, and "below" means that the specification is less than a certain value.

[0033] Example 1

[0034] As attached Figure 1 As shown, a RAP fine separation device provided by an embodiment of the utility model includes a new aggregate supply device, a first separation host 4, a first screening device 5, a lifting conveyor 10, a RAP supply device, a second separation host 14, and a second screening device 19;

[0035] The new aggregate supply device includes a new aggregate hopper 2 and a first feeder 3; the feed port of the first separation host 4 is connected to the first feeder 3, and the discharge port of the first separation host 4 is connected to the first screening device 5; the first screening device 5 includes a first discharge port 6 and a second discharge port 7;

[0036] The RAP supply device includes a RAP hopper 12 and a second feeder 13; the feed port of the second separation host 14 is connected to the second feeder 13, and the discharge port of the second separation host 14 is connected to the second screening device 19; the second screening device 19 includes a third discharge port 15, a fourth discharge port 16, a fifth discharge port 17 and a sixth discharge port 18; the sixth discharge port 18 is connected to the feed port of the first separation host 4 through the lifting conveyor 10;

[0037] Furthermore, the new aggregate hopper 2 is provided with an aggregate anti-blocking device;

[0038] Further, the first feeder 2 is a vibrating feeder;

[0039] Further, the first separation host 4 is a roller crusher;

[0040] Furthermore, the first screening device 5 is a high-frequency vibrating screen;

[0041] Furthermore, the screen of the first screening device 5 is an anti-blocking screen;

[0042] Furthermore, the first screening device 5 screens the material into two grades: 0-3 mm fine material 8 and 3-5 mm fine material 9;

[0043] Further, the RAP hopper 12 is provided with an anti-blocking device;

[0044] Further, the second feeder 13 is a vibrating feeder;

[0045] Furthermore, the second separation host 14 is an impact crusher;

[0046] Furthermore, the second screening device 19 is a high-frequency vibrating screen;

[0047] Furthermore, the screen of the second screening device 19 is made of high wear-resistant steel;

[0048] Furthermore, the second screening device 19 screens the material into three grades: 5-10 mm fine material 20, 10-15 mm fine material 21 and fine material above 15 mm 22;

[0049] Furthermore, the lifting and conveying machine 10 is a chain bucket type lifting machine;

[0050] Furthermore, the equipment includes a storage device for five grades of materials including 0-3mm, 3-5mm, 5-10mm, 10-15mm and above 15mm for fine separation of finished materials.

[0051] Example 2

[0052] As attached Figure 1 As shown, a RAP fine separation device provided by an embodiment of the utility model includes a new aggregate supply device, a first separation host 4, a first screening device 5, a lifting conveyor 10, a RAP supply device, a second separation host 14, and a second screening device 19;

[0053] The new aggregate supply device includes a new aggregate hopper 2 and a first feeder 3; the feed port of the first separation host 4 is connected to the first feeder 3, and the discharge port of the first separation host 4 is connected to the first screening device 5; the first screening device 5 includes a first discharge port 6 and a second discharge port 7;

[0054] The RAP supply device includes a RAP hopper 12 and a second feeder 13; the feed port of the second separation host 14 is connected to the second feeder 13, and the discharge port of the second separation host 14 is connected to the second screening device 19; the second screening device 19 includes a third discharge port 15, a fourth discharge port 16, a fifth discharge port 17 and a sixth discharge port 18; the sixth discharge port 18 is connected to the feed port of the first separation host 4 through the lifting conveyor 10;

[0055] Furthermore, the new aggregate hopper 2 is provided with an aggregate anti-blocking device;

[0056] Further, the first feeder 2 is a vibrating feeder;

[0057] Furthermore, the first separation host 4 is an impact crusher;

[0058] Furthermore, the first screening device 5 is a relaxation screen;

[0059] Furthermore, the screen of the first screening device 5 is an anti-blocking screen;

[0060] Furthermore, the first screening device 5 screens the material into two grades: 0-3 mm fine material 8 and 3-5 mm fine material 9;

[0061] Further, the RAP hopper 12 is provided with an anti-blocking device;

[0062] Further, the second feeder 13 is a vibrating feeder;

[0063] Furthermore, the second separation host 14 is an impact crusher;

[0064] Furthermore, the second screening device 19 is a high-frequency vibrating screen;

[0065] Furthermore, the screen of the second screening device 19 is made of high wear-resistant steel;

[0066] Furthermore, the second screening device 19 screens the material into three grades: 5-10 mm fine material 20, 10-15 mm fine material 21 and fine material above 15 mm 22;

[0067] Furthermore, the lifting and conveying machine 10 is a chain bucket type lifting machine;

[0068] Furthermore, the equipment includes a storage device for five grades of materials including 0-3mm, 3-5mm, 5-10mm, 10-15mm and above 15mm for fine separation of finished materials.

[0069] Although the terms such as new aggregate hopper, RAP hopper, feeder, separation host, screening device, lifting conveyor, discharge port, feed port, fine material, etc. are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A RAP fine separation device, characterized in that: It comprises a new aggregate supply device, a first separation main machine (4), a first screening device (5), a lifting conveyor (10), a RAP supply device, a second separation main machine (14), and a second screening device (19); The new aggregate supply device comprises a new aggregate hopper (2) and a first feeder (3); the feed port of the first separation host (4) is connected to the first feeder (3), and the discharge port of the first separation host (4) is connected to the first screening device (5); the first screening device (5) comprises a first discharge port (6) and a second discharge port (7); The RAP supply device comprises a RAP hopper (12) and a second feeder (13); the feed port of the second separation host (14) is connected to the second feeder (13), and the discharge port of the second separation host (14) is connected to a second screening device (19); the second screening device (19) comprises a third discharge port (15), a fourth discharge port (16), a fifth discharge port (17) and a sixth discharge port (18); the sixth discharge port (18) is connected to the feed port of the first separation host (4) via a lifting conveyor (10).

2. The RAP fine separation device according to claim 1, characterized in that: The first screening device (5) can screen the material into two grades: 0-3 mm fine material (8) and 3-5 mm fine material (9).

3. The RAP fine separation device according to claim 1, characterized in that: The second screening device (19) can screen the material into three grades: 5-10 mm fine material (20), 10-15 mm fine material (21) and fine material above 15 mm (22).

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