Bituminous mixture cold recycling mixing equipment

Abstract

The utility model discloses asphalt mixture cold recycling mixing equipment, which belongs to the technical field of asphalt cold recycling and comprises a horizontal tank body provided with a stirring mechanism, a discharge port is arranged at the bottom of the tank body, a discharge end of a conveyor is arranged above a feed port at the top of the tank body, and the conveyor conveys screened waste stones into the tank body; the stirring mechanism is a continuous stirrer, materials are fully mixed, and the consistency and stability of products are guaranteed; an emulsified asphalt pipe, a fusion agent pipe and a water pipe are also arranged at the top of the tank body and are used for inputting emulsified asphalt, a fusion agent and water into the tank body. The discharging end of the conveyor is arranged above the feeding port in the top of the horizontal tank body, the conveyor is used for conveying screened waste stone into the tank body, emulsified asphalt, a fusion agent and water are input into the tank body through the emulsified asphalt pipe, the fusion agent pipe and the water pipe, the stirring mechanism is used for stirring the mixture in the tank body, and the mixture in the tank body is stirred through the stirring mechanism. The recycled asphalt mixture with various indexes meeting the requirements is prepared.

Description

Technical Field

[0001] The utility model belongs to the technical field of asphalt cold recycling, and particularly relates to an asphalt mixture cold recycling mixing equipment. Background Technique

[0002] After years of rapid and continuous construction, the mileage of highways in China has reached nearly 5 million kilometers, ranking among the top in the world. The road surface directly bears the action of wheel loads and the influence of the natural environment, with a short service life, rapid performance decay, and high maintenance requirements. Every year, a large number of highways enter the stage of major and medium-sized maintenance, which is one of the main sources of highway waste. Since materials such as asphalt and sand and gravel required for asphalt pavements are non-renewable resources, among the large amount of waste pavement materials generated during the major and medium-sized maintenance of highways, although their overall road use performance can no longer meet the requirements of pavement use, as materials themselves, they still have high utilization value.

[0003] At present, the recycling methods of waste pavement materials mostly adopt two methods: hot recycling and cold recycling. Hot recycling is to mix a certain amount of new aggregates, new asphalt, recycling agents (if necessary) etc. according to the asphalt content, asphalt aging degree, aggregate gradation etc. in the old materials for hot mixing to reach the specified indicators. Although the hot recycling has good recovery effect, the process is complex and the investment is high. Cold recycling is a process of softening, crushing, and screening waste materials, and then adding a certain amount of new aggregates, recycling binders, recycling agents etc. to mix at normal temperature or slightly heated in a mixing equipment to obtain recycled materials. However, the cold recycled mixture needs to be under continuous operation conditions to ensure the quality of the product. This traditional cold recycling mixing mostly adopts intermittent mixing method, and the quality of the recycled materials obtained after mixing materials is not high. Therefore, it is necessary to develop a new type of cold recycling mixing equipment to improve the quality of recycled materials and ensure that the recycled materials meet the specified indicators. Content of the Utility Model

[0004] The purpose of the utility model is to provide an asphalt mixture cold recycling mixing equipment, aiming to solve the technical problem that the quality of recycled materials obtained by cold recycling mixing in the prior art is not high.

[0005] To solve the above technical problem, the technical solution adopted by the utility model is:

[0006] An asphalt mixture cold recycling mixing equipment, including a horizontal tank body provided with a stirring mechanism, the bottom of the tank body is provided with a discharge port, above the feed port at the top of the tank body is the discharge end of a conveyor, and the conveyor is used to convey the screened waste stones into the tank body; the top of the tank body is also provided with an emulsified asphalt pipe, a fusion agent pipe and a water pipe, which are used to input emulsified asphalt, fusion agent and water into the tank body; the stirring mechanism is a continuous stirrer.

[0007] Preferably, a weighing sensor is provided at the bottom of the feeding belt of the conveyor, and flow meters are provided on the emulsified asphalt pipe, the fusion agent pipe and the water pipe. The weighing sensor and the flow meter are connected to the controller for controlling the input of waste stone, emulsified asphalt, fusion agent and water into the tank according to the set ratio.

[0008] Preferably, the agitator includes a driving component and multiple stirring shafts, the driving component is arranged outside the tank body, and the multiple stirring shafts are arranged in parallel inside the tank body; a plurality of stirring blades arranged in a spiral shape are arranged at intervals on the stirring shaft, and wear-resistant blocks are provided on the edges of the stirring blades.

[0009] Preferably, there are two stirring shafts, the two stirring shafts rotate in opposite directions, and the stirring blades on the two stirring shafts rotate in opposite directions in an alternating manner.

[0010] Preferably, the wear-resistant block includes a fixed part and a detachable movable part, the fixed part is fixed to the edge of the stirring blade, one end of the fixed part is provided with a wedge-shaped groove for installing the movable part, the movable part is a wedge-shaped block matching the wedge-shaped groove, one end of the movable part extends to the outside of the wedge-shaped groove of the fixed part and is in the same direction as the rotation direction of the stirring blade.

[0011] Preferably, the fixed portion and the bottom of the movable portion are connected and fixed by fastening bolts.

[0012] Preferably, the driving component includes a stirring motor, a driving gear, a first driven gear and a second driven gear, the output shaft of the stirring motor is coaxially fixed with the driving gear, the first driven gear and the second driven gear are coaxially fixed with two stirring shafts respectively; the first driven gear is a double-row gear, the driving gear is meshed with one row of teeth of the first driven gear, and the second driven gear is meshed with the other row of teeth of the first driven gear.

[0013] The beneficial effects of adopting the above technical scheme are as follows: Compared with the prior art, the utility model arranges the discharge end of the conveyor above the top feed port of the horizontal tank body, uses the conveyor to transport the screened waste stone into the tank body, and inputs emulsified asphalt, fusion agent and water into the tank body through the emulsified asphalt pipe, fusion agent pipe and water pipe; at the same time, the stirring mechanism adopts a continuous stirrer, which can fully mix the materials in the tank body on a large scale, ensure the uniformity of the mixing, and ensure the consistency and stability of the output material products, so as to produce a recycled asphalt mixture with various indicators that meet the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0015] In the accompanying drawings:

[0016] Figure 1 is a schematic structural view of a cold recycling mixing device for asphalt mixtures provided by an embodiment of the present utility model;

[0017] Figure 2 is a partial structural view of the stirring shaft in an embodiment of the present utility model;

[0018] Figure 3 is Figure 2 the installation schematic diagram of the wear-resistant block on the stirring blade in

[0019] Figure 4 is a schematic structural view of the driving component in an embodiment of the present utility model;

[0020] In the figure: 1 - tank body, 2 - discharge port, 3 - feed port, 4 - conveyor, 5 - emulsified asphalt pipe, 6 - flux agent pipe, 7 - water pipe, 8 - weighing sensor, 9 - flowmeter, 10 - driving component, 11 - stirring shaft, 12 - stirring blade, 13 - wear-resistant block, 131 - fixing part, 132 - movable part; 14 - fastening bolt; 15 - stirring motor; 16 - driving gear; 17 - first driven gear; 18 - second driven gear. Specific embodiments

[0021] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present utility model will be described below with reference to the accompanying drawings.

[0022] Please refer to Figure 1 , a cold recycling mixing device for asphalt mixtures provided by an embodiment of the present utility model includes a horizontal tank body 1 provided with a stirring mechanism. A discharge port 2 is provided at the bottom of the tank body 1. Above the feed port 3 at the top of the tank body is the discharge end of a conveyor 4, and the conveyor 4 is used to convey the screened waste stones into the tank body 1. The top of the tank body 1 is also provided with an emulsified asphalt pipe 5, a flux agent pipe 6 and a water pipe 7 for inputting emulsified asphalt, flux agent and water into the tank body 1. The stirring mechanism is a continuous stirrer, which can fully mix the materials in a large range to ensure the mixing uniformity. Combined with a uniform feeding device, the consistency and stability of the product are guaranteed. The mixing device of this solution adopts a structure mainly based on mixing and supplemented by conveying, and can fully mix the waste stones screened from the old asphalt pavement with emulsified asphalt, flux agent and water to realize the cold recycling of the asphalt pavement.

[0023] In a specific embodiment of the present utility model, as Figure 1As shown, a weighing sensor 8 is provided at the bottom of the feeding belt of the conveyor 4, and flow meters 9 are provided on the emulsified asphalt pipe 5, the fluxing agent pipe 6, and the water pipe 7. The weighing sensor 8 and the flow meters 9 are both connected to a controller (not shown in the figure) for controlling the input of waste stone, emulsified asphalt, fluxing agent, and water into the tank in a set ratio. The addition ratios of waste stone, emulsified asphalt, fluxing agent, and water are as follows:

[0024] 85 - 100 parts of waste stone, 0.3 - 2.5 parts of emulsified asphalt, 0.02 - 0.3 parts of fluxing agent, and 1.0 - 4.5 parts of water. The fluxing agent includes the following components: 25 - 40 parts of aromatic oil, 1 - 10 parts of silane coupling agent, 15 - 35 parts of light oil, 1 - 8 parts of petroleum resin, and 5 - 16 parts of asphalt emulsifier. The fluxing agent can be used to age - restore the original asphalt coated on the surface of the old stone, improve the compatibility between the new and old asphalt, and produce asphalt mixture meeting the technical requirements.

[0025] Among them, the silane coupling agent can be n - octyltriethoxysilane, and the asphalt emulsifier can be cetyltrimethylammonium bromide. Of course, other silane coupling agents and asphalt emulsifiers can also be selected.

[0026] During the specific design, as Figure 1 、 2 shown, the stirrer includes a driving component 10 and multiple stirring shafts 11. The driving component 10 is arranged outside the tank body 1, and the multiple stirring shafts 11 are arranged in parallel inside the tank body 1; several sections of spiral - arranged stirring blades 12 are provided at intervals on the stirring shafts 11. The material will pass through the gaps between adjacent stirring blades 12 during the stirring process to ensure full mixing; wear - resistant blocks 13 are provided at the edges of the stirring blades 12 to effectively protect the stirring blades. In the Figure 1 shown embodiment, the stirring shafts 11 are designed as two, and the rotation directions of the two stirring shafts 11 are opposite. The stirring blades 12 on the two stirring shafts 11 rotate in a staggered and opposite direction. Through the uniform and continuous stirring of the two stirring shafts, the internal materials can be fully mixed, thereby ensuring the cold - recycling quality of the asphalt mixture.

[0027] In a specific embodiment of the present utility model, as Figure 3As shown, the wear-resistant block 13 includes a fixed part 131 and a detachable movable part 132. The fixed part 131 is welded and fixed to the edge of the stirring blade 12. One end of the fixed part 131 is provided with a wedge-shaped groove for installing the movable part 132. The movable part 132 is a wedge-shaped block matching the wedge-shaped groove. One end of the movable part 132 extends to the outside of the wedge-shaped groove of the fixed part 131 and has the same rotation direction as the stirring blade 12. The arrow in the figure indicates the rotation direction of the stirring shaft. During the rotation of the stirring shaft, the movable part can be more and more tightly embedded in the wedge-shaped groove of the fixed part. During specific manufacturing, the length of the wear-resistant block is not limited to that shown in the figure and can be slightly smaller than the arc edge length of the corresponding stirring blade to protect the stirring blade as much as possible and avoid serious wear on its edge.

[0028] To further optimize this structure, the bottom of the fixed part 131 and the movable part 132 are connected and fixed by a fastening bolt 14 to further improve the firmness of the movable part during stirring.

[0029] Since there are stones in the mixture in the tank body, during the rotation of the stirring shaft, the stones will cause serious wear to the edge of the stirring blade. After installing the wear-resistant block, the wear-resistant block will contact the material first, which can effectively protect the stirring blade and extend the service life of the stirring blade. When the movable part is severely worn, the fastening bolt can be removed, and a special rod can be used to pass through the bolt hole at the bottom of the fixed part to eject the movable part out of the wedge-shaped groove of the fixed part, and then the movable part can be replaced. The wear-resistant block with this structure plays a protective role for the stirring blade, and at the same time, it is convenient and fast to replace the movable part.

[0030] In a specific embodiment of the present invention, as Figure 4 shown, the driving component 10 includes a stirring motor 15, a driving gear 16, a first driven gear 17 and a second driven gear 18. The output shaft of the stirring motor 15 is coaxially fixed to the driving gear 16. The first driven gear 17 and the second driven gear 18 are respectively coaxially fixed to two stirring shafts 11. The first driven gear 17 is a double-row gear. The driving gear 16 meshes with one row of teeth of the first driven gear 17, and the second driven gear 18 meshes with the other row of teeth of the first driven gear 17. By driving the driving gear to rotate through the stirring motor, the driving gear then drives the first driven gear to rotate, and the first driven gear then drives the second driven gear to rotate in the opposite direction, thereby driving the two stirring shafts to rotate in the opposite direction.

[0031] In summary, the utility model has the advantages of reasonable structural design, good material mixing effect, and good quality of the obtained mixture. The old asphalt pavement mixture after non-destructive recovery and screening is conveyed into the tank through a conveyor with a weighing sensor, and then emulsified asphalt, a fusion agent, and water are proportionally conveyed into the tank through an emulsified asphalt pipe, a fusion agent pipe, and a water pipe with flow meters. The mixture in the tank is fully stirred by a continuous mixer to produce a recycled asphalt mixture with all indicators meeting the requirements. At the same time, by installing a number of wear-resistant blocks at the edge of the mixing blades of the mixer, the wear of the mixing blades by the stone materials can be slowed down, effectively prolonging the service life of the mixing blades. Using the utility model can reduce the consumption of new road construction materials, reduce pollution and energy consumption, improve construction efficiency, and realize in-situ cold recycling of asphalt pavements, which is an important means and urgent need to achieve the sustainable development of highway transportation.

[0032] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the scope of protection of the claims of the present utility model.

Claims

1. A cold recycling mixing equipment for asphalt mixture, characterized in that: It includes a horizontal tank body provided with a stirring mechanism. There is a discharge port at the bottom of the tank body. Above the feed inlet at the top of the tank body is the discharge end of a conveyor, and the conveyor is used to convey the screened waste stones into the tank body. There are also an emulsified asphalt pipe, a fusion agent pipe and a water pipe at the top of the tank body, which are used to input emulsified asphalt, fusion agent and water into the tank body. The stirring mechanism is a continuous stirrer. The stirrer includes a driving component and multiple stirring shafts. The driving component is arranged outside the tank body, and multiple stirring shafts are arranged side by side inside the tank body. There are several sections of helically arranged stirring blades spaced on the stirring shafts, and wear-resistant blocks are provided at the edges of the stirring blades. The driving component includes a stirring motor, a driving gear, a first driven gear and a second driven gear. The output shaft of the stirring motor is coaxially fixed with the driving gear. The first driven gear and the second driven gear are respectively coaxially fixed with two stirring shafts. The first driven gear is a double-row gear. The driving gear meshes with one row of teeth of the first driven gear, and the second driven gear meshes with the other row of teeth of the first driven gear.

2. The cold recycling mixing equipment for asphalt mixture according to claim 1, characterized in that: A weighing sensor is provided at the bottom of the feeding belt of the conveyor. Flow meters are provided on the emulsified asphalt pipe, the fusion agent pipe and the water pipe. The weighing sensor and the flow meters are all connected to a controller, which is used to control the input of waste stones, emulsified asphalt, fusion agent and water into the tank body in a set proportion.

3. The cold recycling mixing equipment for asphalt mixture according to claim 1, characterized in that: There are two stirring shafts, and the rotation directions of the two stirring shafts are opposite. The stirring blades on the two stirring shafts rotate in a staggered and opposite direction.

4. The cold recycling mixing equipment for asphalt mixture according to claim 1, characterized in that: The wear-resistant block includes a fixed part and a detachable movable part. The fixed part is fixed at the edge of the stirring blade. One end of the fixed part is provided with a wedge-shaped groove for installing the movable part. The movable part is a wedge-shaped block matching the wedge-shaped groove. One end of the movable part extends outside the wedge-shaped groove of the fixed part and has the same direction as the rotation direction of the stirring blade.

5. The cold recycling mixing equipment for asphalt mixture according to claim 4, characterized in that: The bottom of the fixed part and the movable part are connected and fixed by fastening bolts.

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