Heating and stirring device for asphalt pavement material

Abstract

The utility model discloses a heating and stirring device for an asphalt pavement material, which comprises a first stirring chamber for stirring the asphalt pavement material, a plurality of independent stirring bins which are sequentially communicated to form a stirring and conveying channel are arranged in the first stirring chamber, and a feeding hole is formed in the stirring bin at the starting end of the stirring and conveying channel; 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 heating mode of avoiding direct contact between the asphalt pavement material and open fire. According to the heating and stirring device disclosed by the utility model, the stirring chamber and the heating furnace chamber which are arranged in a split manner are adopted, and the plurality of communicated stirring bins for forming the stirring and conveying channel are arranged in the stirring chamber, so that a manner of providing heat in a non-open-fire contact manner and stirring and heating reclaimed materials in a frying pan manner is formed; the continuous heating and stirring device not only can realize continuous heating and stirring operation of asphalt pavement materials, but also can effectively solve the problem that the asphalt pavement materials are easy to adhere to the inner wall of the regeneration cylinder in the prior art, and avoids adverse factors such as severe aging of asphalt in regenerated materials and performance reduction of regenerated mixtures.

Description

Technical Field

[0001] The utility model belongs to the field of heating and stirring devices, in particular to a heating and stirring device 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 a new device that can indirectly heat and stir asphalt mixture, especially for heating and stirring recycled materials. Utility Model Content

[0005] Purpose of the utility model: The technical problem to be solved by the utility model is to provide a heating and stirring device for asphalt pavement materials, which is particularly suitable for heating and stirring recycled materials. It can not only effectively solve the existing problem of easy adhesion to the inner wall of the regeneration cylinder, but also effectively avoid the occurrence of adverse factors such as serious aging of asphalt in the recycled material and reduced performance of the recycled mixture.

[0006] Technical solution: The heating and stirring device for asphalt pavement material of the utility model comprises:

[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. A feed port is provided on the mixing chamber at the beginning of the mixing and conveying channel, and a discharge port is provided on the mixing chamber at the end of the mixing and conveying channel;

[0008] The closed hot furnace chamber is arranged at the bottom end of the first mixing chamber to provide heat for mixing the asphalt pavement material in a heating manner that prevents the asphalt pavement material from contacting with open flames.

[0009] Furthermore, the heating and stirring device may also include a second stirring chamber located at the bottom end of the closed hot furnace chamber, wherein 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, 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.

[0010] Furthermore, the mixing bin of the heating and stirring device is provided with an end cover, and a speed regulating motor reducer is provided on the end cover. A stirring shaft extending into the mixing bin body is connected to the speed regulating motor reducer, and a propulsion type stirring blade is provided on the stirring shaft. The stirring direction of the propulsion type stirring blade is from the connected mixing bin feed port toward the discharge port, so as to push the asphalt pavement material to stir and transport it backwards at the same time until it is discharged from the discharge port.

[0011] Furthermore, the rotation speed of the speed regulating motor reducer on the stirring bin corresponding to the feed port and the discharge port of the heating and stirring device is higher than the rotation speed of the speed regulating motor reducer on other stirring bins.

[0012] Furthermore, the heating and stirring device 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 for 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.

[0013] Furthermore, the heating and stirring device also includes a heat transfer oil pipe arranged in the first stirring chamber, the second 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 for 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.

[0014] Furthermore, burners for spraying fire and heating the closed hot furnace chamber of the heating and stirring device are arranged on both sides thereof, so as to provide heat for the stirring chamber and the heat transfer oil.

[0015] Furthermore, a smoke removal pipe is provided in the stirring chamber corresponding to the feeding port of the first stirring chamber of the heating and stirring device, and a smoke removal cylinder is provided in the closed hot furnace chamber.

[0016] Furthermore, a smoke removal pipe is provided in the stirring chamber corresponding to the feeding port of the first stirring chamber and the discharging port of the second stirring chamber of the heating and stirring device, and a smoke removal cylinder is provided in the closed hot furnace chamber.

[0017] Furthermore, the heat-conducting oil pipe of the heating and stirring device is arranged to fit the body of the stirring bin and the inside of both sides of the closed hot furnace chamber.

[0018] Beneficial effect: Compared with the prior art, the significant advantages of the utility model are: the heating and stirring device adopts a separately arranged stirring chamber and a hot furnace chamber, and a plurality of connected stirring chambers are arranged in the stirring chamber to form a stirring and conveying channel, so as to provide heat in a non-open flame contact manner and stir and heat the recycled material in the form of a wok, which can not only realize the continuous heating and stirring operation of asphalt pavement materials, but also effectively solve the existing problem of easy adhesion to the inner wall of the regeneration cylinder, and avoid the occurrence of adverse factors such as serious aging of asphalt in the recycled material and reduced performance of the recycled mixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The schematic diagram of the line structure of the heating and stirring device of the utility model Figure 1 ;

[0020] Figure 2 The schematic diagram of the line structure of the heating and stirring device of the utility model Figure 2 ;

[0021] Figure 3 This is a schematic diagram of the product structure of the heating and stirring device of the utility model Figure 1 ;

[0022] Figure 4 This is a schematic diagram of the product structure of the heating and stirring device of the utility model Figure 2 ;

[0023] Figure 5 This is a transverse cross-sectional view of the first mixing chamber of the utility model;

[0024] Figure 6 It is a longitudinal sectional view of the heating and stirring device of the utility model. DETAILED DESCRIPTION

[0025] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0026] like Figures 1 to 4As shown, the heating and stirring device of the utility model is not only suitable for heating and stirring new aggregates in asphalt pavement materials, but also suitable for heating and stirring recycled asphalt mixtures. Specifically, the heating and stirring device includes a closed hot furnace chamber 3 and a first stirring chamber 1 located at the top of the closed hot furnace chamber 3. Alternatively, a second stirring chamber 4 of the same structure can be symmetrically arranged at the bottom of the closed hot furnace chamber 3 to achieve sufficient heating and stirring of the asphalt pavement material. That is, the heating and stirring device of the utility model can adopt a device structure consisting of only the closed hot furnace chamber 3 and the first stirring chamber 1 in actual application; or it can adopt a device structure consisting of the closed hot furnace chamber 3, the first stirring device 1 and the second stirring device 4. The specific setting can be flexibly set according to the actual engineering application. The closed hot furnace chamber 3 is arranged in close contact with the first stirring chamber 1 and the second stirring chamber 4, that is, the upper end plate of the closed hot furnace chamber 3 can be shared with the bottom plate of the first stirring chamber 1, and the lower end plate of the closed hot furnace chamber 3 can be shared with the bottom plate of the second stirring chamber 4, thereby realizing non-open flame contact to provide heat.

[0027] Among them, burners 12 are provided on both sides of the closed hot furnace chamber 3. The burners 12 can be located at the center positions of the two ends of the closed hot furnace chamber 3, 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 3 and the heat-conducting oil pipes located in its furnace, and then the heat is transferred to the first stirring chamber 1 and the second stirring chamber 4 through the upper and lower end plates and the heat-conducting oil pipes.

[0028] like Figure 3 and Figure 4 As shown, a plurality of independent mixing chambers 2 are arranged in sequence on the first mixing chamber 1, and 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 2 are connected in sequence to form a mixing and conveying channel for mixing and conveying the asphalt pavement material. A feed port 15 is provided on the starting mixing chamber 2 corresponding to the mixing and conveying channel, and a discharge port is provided on the end mixing chamber 2, that is, an operation mode of mixing and conveying from the feed port 15 to the discharge port is formed. In order to promote the smooth mixing and transporting of the asphalt pavement material in the mixing chamber 2, a propulsion type stirring blade 8 is provided in the mixing chamber 2. The propulsion type stirring blade 8 can be arranged to be a stirring blade inclined toward the connecting outlet of the mixing chamber 2 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 push-type stirring shafts 8 in several independently arranged mixing chambers 2 is from the connected mixing chamber 2 feed port 15 to the discharge port, and then with the help of the push-type stirring shafts 8 and the asphalt pavement material at the feed port 15 continuously feeding and squeezing to form the asphalt mixture, the stirring and conveying process can be realized until it reaches the discharge port for collection.

[0029] The propulsion stirring blade 8 is arranged on the stirring shaft 7, and the stirring shaft 7 is connected to the output end of the speed regulating motor reducer 6, and the speed regulating motor reducer 6 can be directly arranged on the end cover 5 located on the stirring chamber 2. The operation of the speed regulating motor reducer 6 of several stirring chambers 2 is carried out independently, and further, the setting of several speed regulating motor reducers 6 can be used to further assist the completion of the stirring and conveying operation of the asphalt pavement material, 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 6 on the stirring chamber 2 corresponding to the feed port and the discharge port can be higher than the speed of the speed regulating motor reducer 6 on other stirring chambers 2, that is, by changing the feeding and discharging rate, the working efficiency of the entire heating and stirring device can be improved. Based on this condition, the propulsion stirring blade 8 can directly adopt the existing known stirring blade, and the asphalt pavement material in the slurry state formed by the heating itself can also be stirred and conveyed.

[0030] If the heating and stirring device is provided with a first stirring chamber 1 and a second stirring chamber 4 located at the bottom and top of the closed hot furnace chamber 3, similarly, a plurality of stirring chambers 2 are arranged in the second stirring chamber 4 and are connected in sequence to form a stirring and conveying channel. A feed port is provided on the stirring chamber 2 located at the beginning of the stirring and conveying channel, and a discharge port is provided on the stirring chamber 2 located at the end of the stirring and conveying channel. A discharge pipe 16 is connected to the discharge port to communicate with subsequent equipment, and the feed port on the second stirring chamber 4 is connected to the discharge port on the first stirring chamber 1. The two can be connected by a pipeline directly penetrating the closed hot furnace chamber 3, or by other means.

[0031] In addition to the first stirring chamber 1, the second stirring chamber 4 and the closed hot furnace chamber 3, the utility model can also be provided with a heat-conducting oil pipe 9 for providing a heat source to the stirring chamber 2 in the first stirring chamber 1 and the second stirring chamber 4 in order to further enhance the heating effect. The heat-conducting oil pipe 9 is arranged and arranged in close contact with the chamber body of the stirring chamber 2 and the two sides of the closed hot furnace chamber 3. That is, the heat-conducting oil pipe 9 is first heated by the residual fire of the burner 12 from the inside of the two sides of the closed hot furnace chamber 3, that is, enters the first stirring chamber 1 or the second stirring chamber 4, and is arranged in close contact with the chamber body wall of the stirring chamber 2 of the first stirring chamber 1 and the second stirring chamber 4, and finally returns to the storage tank 10 that provides heat-conducting oil for the heat-conducting oil pipe 9 through the second stirring chamber 4 or one side of the first stirring chamber 1. In order to realize the continuous circulation heating of the heat-conducting oil, the heating and stirring device can also include a heat-conducting oil pump 11 connected to the heat-conducting oil pipe 9 and the storage tank 10 respectively. That is, the outlets of the heat transfer oil pipe 9 at both ends are connected to the inlet of the storage oil tank 10, and the inlet is connected to the outlet of the heat transfer oil pump 11, and the outlet of the storage oil tank 10 is connected to the inlet of the heat transfer oil pump 11, so that the heat transfer oil circulates through the heat transfer oil pump 11.

[0032] In addition, the heating and stirring device also includes a smoke removal tube 14 connected to the closed hot furnace chamber 3, a smoke removal pipe 13 connected to the stirring chamber 2 corresponding to the feed port of the first stirring chamber 1, or a smoke removal pipe 13 is provided in the stirring chamber 2 corresponding to the feed port of the first stirring chamber 1 and the stirring chamber 2 corresponding to the discharge port of the second stirring chamber 4, so as to discharge the smoke generated in each chamber.

Claims

1. A heating and stirring device for asphalt pavement material, characterized in that: The heating and stirring device comprises: A first mixing chamber (1) is used to mix asphalt pavement materials, wherein a plurality of independent mixing chambers (2) are arranged therein and are connected in sequence to form a mixing and conveying channel, wherein a material inlet is provided on the mixing chamber (2) at the beginning of the mixing and conveying channel, and a material outlet is provided on the mixing chamber (2) at the end of the mixing and conveying channel; The closed hot furnace chamber (3) is arranged at the bottom end of the first stirring chamber (1) and provides heat for stirring the asphalt pavement material in a heating manner that avoids direct contact between the asphalt pavement material and an open flame.

2. The heating and stirring device for asphalt pavement material according to claim 1, characterized in that: The heating and stirring device also comprises a second stirring chamber (4) located at the bottom end of the closed hot furnace chamber (3), wherein a plurality of stirring chambers (2) are arranged in the second stirring chamber (4) and are connected in sequence to form a stirring and conveying channel, wherein a feeding port is provided on the stirring chamber (2) located at the beginning of the stirring and conveying channel, and a discharging port is provided on the stirring chamber (2) located at the end of the stirring and conveying channel, and the feeding port on the second stirring chamber (4) is connected to the discharging port on the first stirring chamber (1).

3. The heating and stirring device for asphalt pavement material according to claim 1 or 2, characterized in that: The mixing chamber (2) is provided with an end cover (5), the end cover (5) is provided with a speed regulating motor reducer (6), the speed regulating motor reducer (6) is connected with a mixing shaft (7) extending into the mixing chamber (2), the mixing shaft (7) is provided with a propulsion type stirring blade (8), the stirring direction of the propulsion type stirring blade (8) is from the feeding port of the mixing chamber (2) connected to the mixing chamber (2) 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.

4. The heating and stirring device for asphalt pavement material according to claim 1 or 2, characterized in that: The rotation speed of the speed regulating motor reducer (6) on the stirring bin (2) corresponding to the feed port and the discharge port is higher than the rotation speed of the speed regulating motor reducer (6) on other stirring bins (2).

5. The heating and stirring device for asphalt pavement material according to claim 1, characterized in that: The heating and stirring device also includes a heat transfer oil pipe (9) arranged in the first stirring chamber (1) and the closed heat furnace chamber (3) to transfer heat for stirring the asphalt pavement material, a storage oil tank (10) to provide heat transfer oil for the heat transfer oil pipe (9), and a heat transfer oil pump (11) respectively connected to the heat transfer oil pipe (9) and the storage oil tank (10) to continuously circulate the heat transfer oil.

6. The heating and stirring device for asphalt pavement material according to claim 2, characterized in that: The heating and stirring device also includes a heat transfer oil pipe (9) arranged in the first stirring chamber (1), the second stirring chamber (4) and the closed heat furnace chamber (3) to transfer heat for stirring the asphalt pavement material, a storage oil tank (10) to provide heat transfer oil for the heat transfer oil pipe (9), and a heat transfer oil pump (11) respectively connected to the heat transfer oil pipe (9) and the storage oil tank (10) to continuously circulate the heat transfer oil.

7. The heating and stirring device for asphalt pavement material according to claim 1 or 2, characterized in that: Burners (12) for spraying fire and heating the closed hot furnace chamber (3) are provided on both sides of the closed hot furnace chamber (3), thereby providing heat for the stirring chamber.

8. The heating and stirring device for asphalt pavement material according to claim 1, characterized in that: A smoke removal pipe (13) is provided in the mixing chamber (2) corresponding to the feed port of the first mixing chamber (1), and a smoke removal cylinder (14) is provided in the closed hot furnace chamber (3).

9. The heating and stirring device for asphalt pavement material according to claim 2, characterized in that: A smoke removal pipe (13) is provided in the stirring chamber (2) corresponding to the feeding port of the first stirring chamber (1) and the stirring chamber (2) corresponding to the discharging port of the second stirring chamber (4), and a smoke removal cylinder (14) is provided in the closed hot furnace chamber (3).

10. The heating and stirring device for asphalt pavement material according to claim 5, characterized in that: The heat-conducting oil pipe (9) is arranged and disposed in contact with the body of the stirring bin (2) and inside the two sides of the closed hot furnace chamber (3).

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