Asphalt pavement material plant mixing system

Abstract

The utility model discloses an asphalt pavement material plant mixing system which comprises a material conveying device, a plurality of feeding devices located on the material conveying device and a heating and stirring device connected with a discharging port of the material conveying device. Wherein the heating and stirring device comprises a first stirring chamber, a plurality of independent stirring bins which are sequentially communicated to form a stirring and conveying channel are arranged in the first stirring chamber, a feeding port is formed in the stirring bin located at the starting end of the stirring and conveying channel, and the feeding port is connected with a discharging port of the material conveying device; a discharge hole is formed in the stirring bin at the tail end of the stirring and conveying channel; and the closed heating furnace chamber is attached to the bottom end of the first stirring chamber so as to provide heat for stirring of the asphalt pavement material in a non-open-fire-contact heating mode. The system provided by the utility model not only can directly mix the new aggregate, but also is more suitable for mixing and recycling of the new aggregate and the reclaimed material obtained after fine separation and screening of the waste asphalt pavement material, and improves the utilization rate of the reclaimed material.

Description

Technical Field

[0001] The invention belongs to a factory mixing system for asphalt pavement materials. Background Art

[0002] Hot mix asphalt is produced by heating the aggregate through a drying drum, and then mixing it with hot asphalt and mineral powder after secondary screening. During the aggregate heating process, the aggregate is in direct contact with the open flame in the drying drum, which will cause the aggregate crushing value to decrease. Conventional recycled asphalt mixture is produced by heating the waste asphalt mixture (RAP) through an upper drying drum, and mixing it with the new aggregate in the lower drying drum before entering the mixing cylinder. Since the upper and lower drums are heated in the same way, on the one hand, the heating temperature of RAP is relatively low. In order to meet the mixing temperature of the asphalt mixture, the amount of RAP is relatively low; on the other hand, the contact of RAP with open flames will cause secondary aging of the asphalt.

[0003] In recent years, RAP can be finely separated to separate asphalt from aggregate, producing oil-poor coarse aggregate and oil-rich fine aggregate. In the specific application process, the oil-poor coarse aggregate is usually heated as new aggregate, which will cause the asphalt in the oil-poor coarse aggregate to burn and cause waste; the oil-rich fine aggregate is usually consumed by cold addition, which is difficult to avoid the agglomeration of fine aggregate, making it difficult for the aged asphalt to be highly integrated with the new asphalt and regeneration agent, and the mixture ratio fluctuates.

[0004] Therefore, there is an urgent need for an asphalt pavement material plant mixing system that is not only suitable for the production of new aggregates, but also more suitable for the mixing of asphalt pavement recycled materials to improve its mixing performance and further increase its dosage. Utility Model Content

[0005] Purpose of the utility model: The technical problem to be solved by the utility model is to provide a regeneration system which is not only suitable for the raw mixing of new aggregates, but also more suitable for the mixing of recycled materials of asphalt pavement, so as to improve its mixing performance and further increase its dosage.

[0006] Technical solution: The asphalt pavement material mixing system of the utility model includes a feeding device, a plurality of feeding devices located on the feeding device, and a heating and stirring device connected to the discharge port of the feeding device; wherein the heating and stirring device includes:

[0007] The first mixing chamber is used to mix the asphalt pavement material, and a plurality of independent mixing chambers are arranged therein and are connected in sequence to form a mixing and conveying channel. The mixing chamber located at the beginning of the mixing and conveying channel is provided with a feed port, which is connected to the discharge port of the feeding device, and the mixing chamber located at the end of the mixing and conveying channel is provided with a discharge port;

[0008] The closed hot furnace chamber is arranged at the bottom end of the first mixing chamber and provides heat for mixing the asphalt pavement material by adopting a heating method without open flame contact.

[0009] Furthermore, the system also includes a finished material storage device connected to the discharge port of the heating and stirring device.

[0010] Furthermore, the system also includes a recycled material storage device which is sequentially connected to the discharge port of the heating and stirring device, a stirring device which mixes and stirs the recycled material and new aggregate, and a finished material storage device.

[0011] Furthermore, the feeding device of the system is a conveyor belt conveyor, or is composed of a conveyor belt conveyor and an elevator.

[0012] Furthermore, the feeding device of the system includes a material bin with a vibrating screen mesh inside and a weighing and speed-regulating belt conveyor arranged at the discharge port of the material bin to achieve metered feeding.

[0013] Furthermore, the heating and stirring device of the system also includes a second stirring chamber located at the bottom end of the closed hot furnace chamber, and a plurality of independent stirring chambers are arranged in the second stirring chamber and are connected in sequence to form a stirring and conveying channel. A feed port is provided on the stirring chamber located at the beginning of the stirring and conveying channel, and a discharge port is provided on the stirring chamber located at the end of the stirring and conveying channel, and the feed port on the second stirring chamber is connected to the discharge port on the first stirring chamber.

[0014] Furthermore, the system's mixing bin is provided with an end cover, the end cover is provided with a speed regulating motor reducer, the speed regulating motor reducer is connected to a mixing shaft extending into the mixing bin body, the mixing shaft is provided with a propulsion type mixing blade, and the stirring direction of the propulsion type mixing blade is from the connected mixing bin feed port toward the discharge port, so as to push the asphalt pavement material while stirring it and transporting it backward until it is discharged from the discharge port.

[0015] Furthermore, the heating and stirring device of the system also includes a heat transfer oil pipe arranged in the first stirring chamber and the closed hot furnace chamber to transfer heat for stirring the asphalt pavement material, a storage tank for providing heat transfer oil to the heat transfer oil pipe, and a heat transfer oil pump respectively connected to the heat transfer oil pipe and the storage tank to continuously circulate the heat transfer oil.

[0016] Furthermore, burners for spraying fire and heating the closed hot furnace chamber of the system are arranged on both sides thereof, so as to provide heat for the stirring chamber.

[0017] Furthermore, a smoke removal pipe is provided in the mixing chamber corresponding to the feeding port of the first mixing chamber of the system, and a smoke removal cylinder is provided in the closed hot furnace chamber.

[0018] Furthermore, a smoke removal pipe is provided in the mixing chamber corresponding to the first mixing chamber feed port and the second mixing chamber discharge port of the system, and a smoke removal cylinder is provided in the closed hot furnace room.

[0019] Beneficial effects: Compared with the prior art, the advantages of the utility model are: the system can not only directly mix new aggregates, but is also more suitable for the mixing and recycling of recycled materials after fine separation and screening of waste asphalt pavement materials and new aggregates, thereby improving the utilization rate of recycled materials. The addition ratio in factory-mixed hot recycled asphalt mixture can reach 50%-100%, which greatly reduces the production cost of asphalt mixtures and improves the social and economic benefits of recycling recycled materials after fine separation and screening of waste asphalt pavement materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The three-dimensional system of the utility model Figure 1 ;

[0021] Figure 2 for Figure 1 Stereo Figure 1 The main view;

[0022] Figure 3 for Figure 1 Stereo Figure 1 A top view of

[0023] Figure 4 The three-dimensional system of the utility model Figure 2 ;

[0024] Figure 5 for Figure 4 Stereo Figure 2 The main view;

[0025] Figure 6 for Figure 4 Stereo Figure 2 A top view of

[0026] Figure 7 This is a schematic diagram of the line structure of the system heating and stirring device of the utility model Figure 1 ;

[0027] Figure 8 This is a schematic diagram of the line structure of the system heating and stirring device of the utility model Figure 2 ;

[0028] Fig. 9 This is a schematic diagram of the product structure of the system heating and stirring device of the utility model. Figure 1 ;

[0029] Fig.10 This is a schematic diagram of the product structure of the heating and stirring device of the utility model system Figure 2 ;

[0030] Fig.11 It is a transverse cross-sectional view inside the first stirring chamber of the system of the utility model;

[0031] Fig.12 It is a longitudinal sectional view of the heating and stirring device of the utility model system. DETAILED DESCRIPTION

[0032] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings. It should be noted that the feeding device, stirring device, recycled material storage device, finished material storage device and weighing speed-adjusting belt conveyor used in the system of the utility model are all existing well-known components, and no relevant structural improvements have been made, such as the components involved in the public or sold by Langfang Deji Machinery Technology Co., Ltd.

[0033] The asphalt pavement material mixing system of the utility model comprises a feeding device 1, a plurality of feeding devices 2 located at the upper end of the feeding device 1 for material transmission through the feeding device 1, and a heating and stirring device 3 connected with the feeding device 1 for heating and stirring the asphalt pavement material supplied in the feeding device 2. The feeding device 1 can be a conveyor belt conveyor, or can be composed of a conveyor belt conveyor and an elevator 10, and the discharge port of the feeding device 1 is connected with the feed port of the heating and stirring device 3. Whether to select the conveyor belt conveyor or the combination of the conveyor belt conveyor and the elevator 10 is to flexibly adjust the height of the heating and stirring device 3.

[0034] The specific number of the feeding device 2 can be set according to the different specifications of the asphalt pavement materials to be mixed, and there is no specific limitation. It includes a material bin 12 located at the upper end of the feeding device 1, and a vibrating screen 11 is provided in the material bin 12, through which the material quickly enters the material bin 12. A vibrator 25 is provided on the material bin to prevent the material from arching in the material bin 12 and causing insufficient feeding. A weighing and speed-adjusting belt conveyor 13 is provided at the discharge port of the material bin 12, which can also be called a weighing belt conveyor. The weighing and speed-adjusting belt conveyor 13 can adjust the discharge speed according to the target mix ratio to discharge the material to the feeding device 1.

[0035] The system of the utility model can not only be directly used in the factory mixing process of new aggregate, but also can realize the factory mixing process of recycled material and new aggregate. The factory mixing process of recycled material and new aggregate can be realized by mixing the two together into the heating and stirring device for mixing when feeding, or heating and stirring the recycled material before mixing with the new aggregate. Based on the different engineering applications of the three, the corresponding systems are slightly different, as follows:

[0036] When the factory mixing system composed of the above basic components of the conveying device 1, several feeding devices 2 and the heating and stirring device 3 is used to directly mix the new aggregate, the system also includes a finished material storage device 7 located at the discharge port of the heating and stirring device 3. And the finished material storage device 7 is composed of a storage bin, a metering device and an electric valve. The feed port of the storage bin is connected to the discharge port of the heating and stirring device 3. This connection is a soft connection and is installed on the main building frame through the metering device; the electric valve is installed at the lower port of the storage bin. By opening and closing the electric valve, the material is discharged to the engineering vehicle through the metering device according to the loading tonnage of the engineering vehicle, such as Figures 1 to 3 shown.

[0037] When the plant mixing system composed of the above basic components of the feeding device 1, several feeding devices 2 and the heating and stirring device 3 is used to mix the recycled material with the new aggregate, and the two are mixed before heating and stirring, the system also includes a finished material storage device 7 located at the discharge port of the heating and stirring device. And the finished material storage device 7 is composed of a storage bin, a metering device and an electric valve, wherein the metering device can be a metering scale known in the art. The feed port of the storage bin is connected to the discharge port of the heating and stirring device 3, and this connection is a soft connection, which is installed on the main building frame through the metering device; the electric valve is installed at the lower port of the storage bin, and the electric valve is opened and closed, and the material is discharged to the engineering vehicle through the metering device according to the loading tonnage of the engineering vehicle.

[0038] When the factory mixing system composed of the above basic components of the conveying device 1, several feeding devices 2 and the heating and stirring device 3 is used to mix the recycled material with the new aggregate, and the recycled material is first heated and stirred before being mixed with the new aggregate, the system is also provided with a recycled material storage device 8 and a stirring device 9 in sequence between the heating and stirring device 2 and the finished material storage device 7. The stirring device 9 can be an existing mixing pot. The recycled storage device 8 is composed of a storage bin, a metering device and an electric valve. The feed port of the storage bin is connected to the discharge port of the heating and stirring device. This connection is a soft connection and is installed on the main building frame through the metering device; the electric valve is installed at the lower port of the storage bin. By opening and closing the electric valve, the recycled mixture is discharged to the stirring device of the asphalt mixing plant through the metering device according to the mixing ratio of the recycled mixture and the new aggregate, and finally stored through the finished material storage device 7. Figures 4 to 6 shown.

[0039] Regardless of the above-mentioned methods, the difference lies in the different components connected to the heating and stirring device 3. The heating and stirring method of the heating and stirring device 3 used is the same whether it is for recycled materials, new aggregates, or a mixture of recycled materials and new aggregates. Specifically, Figures 7 to 10As shown, the heating device includes a separately arranged closed hot furnace chamber 6 and a first stirring chamber 4 located at the top of the closed hot furnace chamber 6. Alternatively, a second stirring chamber 14 of the same structure can be symmetrically arranged at the bottom of the closed hot furnace chamber 6. That is, the heating and stirring device of the system of the utility model can adopt a device structure consisting of only the closed hot furnace chamber 6 and the first stirring chamber 4 in actual application; or a device structure consisting of the closed hot furnace chamber 6, the first stirring device 4 and the second stirring device 14 can be adopted, and the specific settings can be flexibly set according to the actual engineering application. The closed hot furnace chamber 6 is arranged in close contact with the first stirring chamber 4 and the second stirring chamber 14, that is, the upper end plate of the closed hot furnace chamber 6 can be shared with the bottom plate of the first stirring chamber 4, and the lower end plate of the closed hot furnace chamber 6 can be shared with the top plate of the second stirring chamber 14, thereby realizing non-open flame contact to provide heat.

[0040] Among them, burners 22 are provided on both sides of the closed hot furnace chamber 6. The burners 22 can be located at the center position of the two ends of the closed hot furnace chamber 6, and flames are sprayed from the two ends to the middle to heat the upper and lower end plates of the closed hot furnace chamber 6 and the heat transfer oil pipe 19 located in its furnace, and then the heat is transferred to the first stirring chamber 4 and the second stirring chamber 14 through the upper and lower end plates and the heat transfer oil pipe 19.

[0041] like Fig.11 and Fig.12 As shown, a plurality of independent mixing chambers 5 are arranged in sequence on the first mixing chamber 4, which can be arranged in sequence along horizontal and / or vertical rows. The specific number is not limited and can be adjusted according to actual needs. The chamber bodies of the plurality of mixing chambers 5 are connected in sequence to form a mixing and conveying channel for mixing and conveying the asphalt pavement material. A feed port 26 is provided on the starting mixing chamber 5 corresponding to the mixing and conveying channel, and the feed port 26 is connected to the discharge port of the feeding device 1; a discharge port is provided on the end mixing chamber 5, that is, an operation mode of mixing and conveying from the feed port 26 to the discharge port is formed. In order to promote the smooth mixing and transporting of the asphalt pavement material in the mixing chamber, a propulsion stirring blade 18 is provided in the mixing chamber 5. The propulsion stirring blade 18 can be set to be a stirring blade inclined toward the connecting outlet of the mixing chamber 5 to form a driving force for the asphalt pavement material being mixed. The specific structure is not limited, as long as it can be formed to push it to the connecting outlet for transportation. The stirring direction of the propulsion stirring blades 18 in the several independently arranged mixing bins 5 is from the feed port of the connected mixing bins 5 to the discharge port. Then, with the help of the propulsion stirring blades 18 and the continuous feeding and squeezing of the asphalt pavement material at the feed port, the stirring and conveying process of the asphalt mixture can be realized until it reaches the discharge port for collection.

[0042] The propulsion stirring blade 18 is arranged on the stirring shaft 17, and the stirring shaft 17 is connected to the output end of the speed regulating motor reducer 16, and the speed regulating motor reducer 16 can be directly arranged on the end cover 15 located on the stirring chamber 5. The operation of the speed regulating motor reducers 16 of several stirring chambers 5 is carried out independently, and further, with the help of the setting of several speed regulating motor reducers 16, the stirring and conveying operation of the asphalt pavement material can be further assisted, and the speed can be adjusted according to the production capacity and mixing uniformity, the temperature of the closed hot furnace chamber and the discharge temperature of the asphalt pavement material. For example, in order to improve the stirring and conveying efficiency, the speed of the speed regulating motor reducer 16 on the stirring chamber 5 corresponding to the feed port and the discharge port can be higher than the speed of the speed regulating motor reducer 16 on other stirring chambers 5, that is, by changing the feeding and discharging rates, the working efficiency of the entire heating and stirring device can be improved. Based on this condition, the propulsion stirring blade 18 can directly adopt the existing well-known stirring blades. When the speed is increased and the asphalt pavement material itself is in a slurry state due to heating, it can also carry out the operation of stirring and conveying.

[0043] If the heating and stirring device is provided with a first stirring chamber 4 and a second stirring chamber 14 located at the bottom and top of the closed hot furnace chamber 6, similarly, a plurality of stirring chambers 5 are arranged in the second stirring chamber 14 and are connected in sequence to form a stirring and conveying channel. A feeding port is provided on the stirring chamber 5 located at the beginning of the stirring and conveying channel, and a discharging port is provided on the stirring chamber 5 located at the end of the stirring and conveying channel. A discharging pipe 27 is connected to the discharging port, which is connected to the finished material storage device 7 or the recycled material storage device 8, and the feeding port on the second stirring chamber 14 is connected to the discharging port on the first stirring chamber 4. The connection between the two can be directly provided by a pipeline penetrating the closed hot furnace chamber 6, or can be connected in other ways.

[0044] In addition to the first stirring chamber 4, the second stirring chamber 14 and the closed hot furnace chamber 6, the present invention can also be provided with a heat transfer oil pipe 19 for providing a heat source for the stirring chamber 5 in the first stirring chamber 4 and the second stirring chamber 14 in order to further enhance the heating effect. The heat transfer oil pipe 19 is arranged and arranged in close contact with the silo body of the stirring silo 2 and the two sides of the closed hot furnace chamber 3. That is, the heat transfer oil pipe 19 is first heated by the residual fire of the burner 22 from the inside of the two sides of the closed hot furnace chamber 6, enters the first stirring chamber 4 or the second stirring chamber 14, and is arranged in close contact with the silo body wall of the stirring chamber 5 of the first stirring chamber 4 or the second stirring chamber 14, and finally returns to the storage tank 20 for providing heat transfer oil to the heat transfer oil pipe 19 through the second stirring chamber 14 or one side of the first stirring chamber 4. In order to realize the continuous circulation heating of the heat transfer oil, the heating and stirring device 3 can also include a heat transfer oil pump 21 connected to the heat transfer oil pipe 19 and the storage tank 20 respectively. That is, the outlets of the heat transfer oil pipe 19 at both ends are connected to the inlet of the storage oil tank 20, and the inlet is connected to the outlet of the heat transfer oil pump 21, and the outlet of the storage oil tank 20 is connected to the inlet of the heat transfer oil pump 21, so that the heat transfer oil circulates through the heat transfer oil pump 21.

[0045] In addition, the heating and stirring device also includes a smoke removal tube 24 connected to the closed hot furnace chamber 6. A smoke removal tube 23 is connected to the stirring chamber 5 corresponding to the feed inlet of the first stirring chamber 4, or a smoke removal tube 23 is connected in the stirring chamber 5 corresponding to the feed inlet of the first stirring chamber 4 and the stirring chamber 5 corresponding to the discharge port of the second stirring chamber 14, so as to discharge the smoke generated in each chamber.

Claims

1. An asphalt pavement material mixing system, characterized in that: The system comprises a feeding device (1), a plurality of feeding devices (2) located on the feeding device (1), and a heating and stirring device (3) connected to a discharge port of the feeding device (1); wherein the heating and stirring device (3) comprises: A first mixing chamber (4) is used to mix the asphalt pavement material, wherein a plurality of independent mixing chambers (5) are arranged therein and are connected in sequence to form a mixing and conveying channel, wherein the mixing chamber (5) located at the beginning of the mixing and conveying channel is provided with a feed port, the feed port being connected to the discharge port of the feeding device (1), and the mixing chamber (5) located at the end of the mixing and conveying channel is provided with a discharge port; The closed hot furnace chamber (6) is arranged at the bottom end of the first mixing chamber (4) and provides heat for mixing the asphalt pavement material by adopting a heating method without open flame contact.

2. The asphalt pavement material mixing system according to claim 1, characterized in that: The system also includes a finished material storage device (7) connected to the discharge port of the heating and stirring device (3).

3. The asphalt pavement material mixing system according to claim 1, characterized in that: The system also includes a recycled material storage device (8) connected in sequence to the discharge port of the heating and stirring device (3), a stirring device (9) for mixing and stirring the recycled material and new aggregate, and a finished material storage device (7).

4. The asphalt pavement material mixing system according to claim 1, characterized in that: The feeding device (1) is a conveyor belt conveyor, or is composed of a conveyor belt conveyor and a hoist (10).

5. The asphalt pavement material mixing system according to claim 1, characterized in that: The feeding device (2) comprises a material bin (12) in which a vibrating screen (11) is provided, and a weighing and speed-adjustable belt conveyor (13) provided at a discharge port of the material bin (12) to achieve metered feeding.

6. The asphalt pavement material mixing system according to claim 1, characterized in that: The heating and stirring device also includes a second stirring chamber (14) located at the bottom end of the closed hot furnace chamber (6), wherein a plurality of stirring chambers (5) are arranged in the second stirring chamber (14) and are connected in sequence to form a stirring and conveying channel, wherein a feeding port is provided on the stirring chamber (5) located at the beginning of the stirring and conveying channel, and a discharging port is provided on the stirring chamber (5) located at the end of the stirring and conveying channel, and the feeding port on the second stirring chamber (14) is connected to the discharging port on the first stirring chamber (4).

7. The asphalt pavement material factory mixing system according to claim 1 or 6, characterized in that: The mixing chamber (5) is provided with an end cover (15), and a speed regulating motor reducer (16) is provided on the end cover (15). A mixing shaft (17) extending into the mixing chamber (5) is connected to the speed regulating motor reducer (16), and a propulsion type mixing blade (18) is provided on the mixing shaft (17). The stirring direction of the propulsion type mixing blade (18) is from the feeding port of the mixing chamber (5) connected to the mixing chamber (5) to the discharging port, so as to promote the mixing of the asphalt pavement material and transport it backwards until it is discharged from the discharging port.

8. The asphalt pavement material mixing system according to claim 1, characterized in that: The heating and stirring device also includes a heat transfer oil pipe (19) arranged in the first stirring chamber (4) and the closed heat furnace chamber (6) to transfer heat for stirring the asphalt pavement material, a storage oil tank (20) to provide heat transfer oil for the heat transfer oil pipe (19), and a heat transfer oil pump (21) respectively connected to the heat transfer oil pipe (19) and the storage oil tank (20) to continuously circulate the heat transfer oil.

9. The asphalt pavement material factory mixing system according to claim 1 or 6, characterized in that: Burners (22) for spraying fire and heating the closed hot furnace chamber (6) are arranged on both sides of the closed hot furnace chamber (6) to provide heat for the stirring chamber.

10. The asphalt pavement material mixing system according to claim 1, characterized in that: A smoke removal pipe (23) is provided in the mixing chamber (5) corresponding to the feed port of the first mixing chamber (4), and a smoke removal cylinder (24) is provided in the closed hot furnace chamber (6).

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