Asphalt mixing device and method of using the same

Abstract

The present invention relates to the field of asphalt mixing, and discloses an asphalt mixing device and a method for using the same, comprising a mixing drum and a guide plate, wherein a plurality of stirring blades equidistantly distributed in an annular shape are arranged inside the mixing drum, a feed port and an air outlet are respectively arranged at opposite ends of the top surface of the mixing drum, the guide plate is rotatably arranged between the feed port and the stirring blade, an air channel is arranged on the end surface of the guide plate, and the device further comprises a rotating shaft, a rotary joint, a hot air blower and a motor, wherein the rotating shaft passes through the mixing drum, the guide plate and the rotary joint are respectively connected to the rotating shaft, a flow channel is arranged inside the rotating shaft, the air channel is communicated with the rotary joint through the flow channel, the hot air blower and the motor are respectively connected to the rotary joint, and by arranging the guide plate as a buffer between the feed port and the stirring blade, the asphalt or other external additives will first fall onto the guide plate after entering the mixing drum, so as to avoid direct impact on the stirring blade.

Description

Technical Field

[0001] The invention relates to the field of asphalt mixing, and in particular to an asphalt mixing device and a use method thereof. Background Art

[0002] The production of hot mix asphalt concrete is a process of mixing asphalt with hot aggregate, powder and other external additives according to a certain gradation to form a uniform mixture. In this process, in order to ensure that the asphalt has good fluidity and that the produced mixture reaches the preset temperature range, the heating system will be used to heat the materials in the mixing drum during the asphalt mixing process;

[0003] In the existing mixing drum, the heating system is used to transfer heat to the mixing drum during the mixing process. Under such high temperature conditions, the asphalt will maintain good fluidity and will not easily remain on the inner wall of the mixing drum. However, it is difficult for the heating system to transfer heat to the mixing blades, which causes the asphalt and aggregate to easily adhere to the mixing blades, forming material accumulation and affecting the mixing effect. Secondly, harmful exhaust gas will be generated during the heating and mixing process. These exhaust gases are not only harmful to the human body and the environment, but if they are not discharged from the mixing drum in time, the stability of the heating and mixing process will be further affected due to gas accumulation, thereby affecting the uniformity and quality of the asphalt mixture.

[0004] In order to solve the problem of exhaust gas pollution, ventilation ports are usually set on the mixing drum. The toxic and harmful gases generated during the heating process are concentrated through pipelines and then decomposed and deodorized by flue gas treatment equipment to meet the emission standards. However, in the relatively sealed environment of the mixing drum, high requirements are placed on the layout of the ventilation ports and the performance of related fans, otherwise the problem of uneven local ventilation is likely to occur. Summary of the invention

[0005] The purpose of the present application is to provide an asphalt mixing device and a method for using the same to solve the problem that the existing heating system is difficult to conduct heat to the mixing blades, resulting in the asphalt and aggregate easily adhering to the mixing blades, and the ventilation efficiency is low and the ventilation is easily uneven due to ventilation only relying on the ventilation port. The specific technical solution is as follows:

[0006] An asphalt mixing device comprises a mixing drum and a guide plate, wherein a plurality of stirring blades equidistantly distributed in a ring shape are arranged inside the mixing drum, a feed port and an air outlet are respectively arranged at opposite ends of the top surface of the mixing drum, the guide plate is rotatably arranged between the feed port and the stirring blades, an air channel is arranged on the end surface of the guide plate, and further comprises a rotating shaft, a rotating joint, a hot air blower and a motor, the rotating shaft is penetrated through the mixing drum and rotatably cooperates with the mixing drum, the guide plate and the rotating joint are respectively connected to the rotating shaft, a flow channel is arranged inside the rotating shaft, the air channel is communicated with the rotating joint through the flow channel, and the hot air blower and the motor are respectively connected to the rotating joint.

[0007] Preferably, the stirring blade and the guide plate are respectively arranged to rotate in two mutually perpendicular directions.

[0008] Preferably, the rotary joint includes a shell and a rotary tube, one end of the rotary tube is rotatably connected to the shell, the outer side of the other end of the rotary tube is transmission-coordinated with the motor, and the end face of the other end of the rotary tube is connected to the rotating shaft to make the rotary tube conductive with the flow channel.

[0009] Preferably, it also includes a conveyor belt for transporting materials, and the conveyor belt is arranged above the feed port.

[0010] Preferably, it also includes an air filter device and a pipeline, wherein the air filter device is installed at the air outlet, one end of the pipeline is connected to the air filter device, the other end of the pipeline extends to the side of the conveyor belt, and the pipe mouth of the pipeline is set toward the conveyor belt.

[0011] Preferably, it further comprises an insulation box body, wherein an end surface of the insulation box body is provided with an opening, the conveyor belt passes through the insulation box body through the opening, and the pipeline is connected to the insulation box body.

[0012] A method for using a stirring device, applied to the above-mentioned asphalt stirring device, comprises the following steps:

[0013] S1. Start the conveyor belt to transport the material, and use the guide plate to guide the material into the mixing drum;

[0014] S2. Adjust the stirring blade and the guide plate so that the guide plate is placed horizontally, rotate any one of the plurality of stirring blades to the highest point and place the stirring blade vertically below the guide plate;

[0015] S3, calculating the angle between two adjacent stirring blades and the time T required for each stirring blade to rotate through the angle according to the number of stirring blades and the rotation speed of the stirring blades;

[0016] S4, driving the stirring blade and the horizontal guide plate to rotate simultaneously, and the guide plate rotates 180 degrees within time T;

[0017] S5. When the guide plate rotates in the lower half of its rotation area, the hot air blower is synchronously started to transport hot air into the air passage of the guide plate. When the guide plate rotates in the upper half of its rotation area, the hot air blower stops transporting hot air to the air passage of the guide plate.

[0018] Preferably, in step S1, the feed inlet is covered after the material is conveyed.

[0019] Preferably, in step S2, the interior of the mixing drum is configured to be divided into an upper half and a lower half along a horizontally arranged diameter of the mixing drum, the material is located in the lower half of the mixing drum, and the mixing blade at the highest point is located in the upper half.

[0020] Preferably, the temperature of the hot air delivered by the hot air blower is 150-230 degrees Celsius.

[0021] Beneficial effects of this application:

[0022] 1. By setting the guide plate as a buffer between the feed port and the stirring blade, the asphalt or other external additives will first fall onto the guide plate after entering the mixing drum, avoiding direct impact on the stirring blade; due to the rotatable nature of the guide plate, the guide plate can also guide the falling direction or angle of the asphalt or other external additives, so that the asphalt or other external additives can be laid more evenly inside the mixing drum, which is conducive to subsequent mixing operations;

[0023] 2. Use a hot air blower to cooperate with other heating systems of the mixing drum to heat and improve the heating efficiency. The hot air delivered by the hot air blower will directly contact the stirring blades, increase the surface temperature of the stirring blades, and make it difficult for asphalt to adhere to the stirring blades; even if there is asphalt remaining on the stirring blades, the adhesion of the asphalt on the stirring blades will be gradually weakened because the stirring blades are constantly in contact with other asphalt mixtures during the mixing process, making it easier to be thrown out or thrown out under the action of centrifugal force;

[0024] 3. The heat in the hot air and harmful exhaust gas discharged from the air outlet can be reused to improve energy utilization efficiency.

[0025] Additional aspects and advantages of the present invention will be given in part in the description below, and in part will become apparent from the description below, or will be understood through the practice of the present invention. Of course, it is not necessary to achieve all of the advantages described above at the same time to implement any product or method of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention 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 only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 It is a structural schematic diagram of the present invention.

[0028] Figure 2 It is a schematic structural diagram of a mixing drum of the present invention.

[0029] Figure 3 It is a structural schematic diagram of the guide plate of the present invention.

[0030] Figure 4 It is another structural schematic diagram of the guide plate of the present invention.

[0031] In the figure: 1. mixing drum; 2. guide plate; 3. mixing blade; 4. rotating shaft; 5. rotating joint; 6. hot air blower; 7. motor; 8. conveyor belt; 9. air filter; 10. pipeline; 11. feed inlet; 12. air outlet; 21. air duct; 41. flow channel; 51. shell; 52. rotating tube; 511. gear ring; 71. gear; 81. insulation box. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] In order to ensure that asphalt or other external additives can be fully and evenly mixed, the prior art usually sets the feed port 11 of the mixing drum 1 directly above the stirring blade 3. However, since the asphalt body is heavy, it will directly fall on the stirring blade 3 after entering the mixing drum 1, causing impact on the stirring blade 3. Based on this, the present invention provides an embodiment to solve the above technical problems, specifically including a mixing drum 1 and a guide plate 2. The interior of the mixing drum 1 is provided with a plurality of stirring blades 3 distributed in an annular shape and at equal intervals. The opposite ends of the top surface of the mixing drum 1 are respectively provided with a feed port 11 and an air outlet 12. The guide plate 2 is rotatably arranged between the feed port 11 and the stirring blade 3. By setting the guide plate 2 as a buffer between the feed port 11 and the stirring blade 3, the asphalt or other external additives will first fall on the guide plate 2 after entering the mixing drum 1, avoiding direct impact on the stirring blade 3.

[0035] Due to the rotatable feature of the guide plate 2, the guide plate 2 can also guide the falling direction or angle of the asphalt or other external additives, so that the asphalt or other external additives can be laid more evenly inside the mixing drum 1, which is beneficial to the subsequent mixing operation.

[0036] Based on the prior art, when using electric heating, hot oil heating or other heating systems to transfer heat to the mixing drum 1, it is difficult for the heat to be transferred to the mixing blades 3, causing asphalt and aggregate to easily adhere to the mixing blades 3 and relying solely on the ventilation port for ventilation, resulting in low ventilation efficiency and prone to uneven ventilation. Please refer to Figure 1-4 The present invention provides an embodiment to solve the above-mentioned problem. On the basis of the above-mentioned mixing drum 1 and guide plate 2, it also includes a rotating shaft 4, a rotary joint 5, a hot air blower 6 and a motor 7, wherein an air channel 21 is provided on the end surface of the guide plate 2, the rotating shaft 4 is penetrated in the mixing drum 1 and rotates with it, the guide plate 2 and the rotary joint 5 are respectively connected to the rotating shaft 4, a flow channel 41 is provided inside the rotating shaft 4, the air channel 21 is communicated with the rotary joint 5 through the flow channel 41, the hot air blower 6 and the motor 7 are respectively connected to the rotary joint 5, in this embodiment, the hot air output by the hot air blower 6 is transported to the mixing drum 1 through the rotary joint 5, the flow channel 41 and the air channel 21, and the hot air blower 6 is used to cooperate with other heating systems for heating to improve the heating efficiency, and the hot air will also directly contact the stirring blade 3 to increase the surface temperature of the stirring blade 3, so that the asphalt is not easy to adhere to the stirring blade 3;

[0037] When the surface temperature of the stirring blade 3 reaches a certain level, even if there is asphalt remaining on the stirring blade 3, the stirring blade 3 will continuously contact with other asphalt mixtures during the stirring process, generating shear force and impact force. These forces will act on the asphalt attached to the stirring blade 3, gradually weakening its adhesion, making it easier to be thrown out or being thrown out under the action of centrifugal force.

[0038] In some embodiments, the stirring blades 3 and the guide plates 2 are respectively arranged to rotate in two mutually perpendicular directions. Specifically, a rotating shaft is arranged inside the mixing drum 1, and a plurality of stirring blades 3 equidistantly distributed in a ring shape are connected to the surface of the rotating shaft. The stirring blades 3 are driven by the rotating shaft to rotate circumferentially. In order to guide the asphalt to fall evenly to the inner bottom surface of the mixing drum 1, the guide plates 2 need to be arranged along the axial direction of the mixing drum 1 and rotate in this direction. The stirring blades 3 and the guide plates 2 do not interfere with each other during the rotation process.

[0039] For swivel joint 5, see Figure 3 The rotary joint 5 includes a shell 51 and a rotary tube 52, one end of the rotary tube 52 is rotatably connected to the shell 51, and the outer side of the other end of the rotary tube 52 is in transmission cooperation with the motor 7. Specifically, a gear ring 511 is sleeved on the rotary tube 52 or the rotary tube 52 has a tooth groove arranged around its side, and the motor 7 is connected to a gear 71, and the gear 71 is meshed with the gear ring 511 for transmission or the gear 71 is meshed with the tooth groove for transmission to realize the transmission cooperation between the rotary tube 52 and the motor 7; in addition, the other end face of the rotary tube 52 is connected to the rotating shaft 4 to make the rotary tube 52 and the flow channel 41 conductive, and the rotary joint 5 is provided to realize the rotation of the rotating shaft 4 when conveying hot air;

[0040] The purpose of rotating the guide plate 2 is to form an air flow path toward the air outlet 12. By rotating the guide plate 2, the hot air and harmful exhaust gas generated during the stirring process are blown toward the air outlet 12. In this process, the hot air will contact the stirring blade 3 and transfer the heat to the stirring blade 3.

[0041] The heat in the hot air and harmful exhaust gas discharged from the air outlet 12 can also be reused. Specifically, in some embodiments, the present invention also includes a conveyor belt 8, an air filter device 9 and a pipeline 10 for transporting materials. The conveyor belt 8 is arranged above the feed port 11, and the air filter device 9 is installed at the air outlet 12. One end of the pipeline 10 is connected to the air filter device 9, and the other end of the pipeline 10 extends to the side of the conveyor belt 8, and the pipe mouth of the pipeline 10 is arranged in the direction of the conveyor belt 8; it can be understood that the gas discharged from the air outlet 12 still has a certain amount of heat after being purified by the air filter device 9, and this heat can be used to preheat the asphalt or other external additives on the conveyor belt 8;

[0042] In order to further improve the preheating effect and slow down the heat loss, the present invention also provides an embodiment, specifically, an insulation box 81 is set and the end face of the insulation box 81 is provided with an opening, the conveyor belt 8 passes through the insulation box 81 through the opening, and the pipeline 10 is connected to the insulation box 81, that is, the asphalt or other external additives transported by the conveyor belt 8 will pass through the insulation box 81, and the gas discharged from the air outlet 12 will make the interior of the insulation box 81 heat up, thereby realizing the preheating of the asphalt or other external additives passing through. The material of the insulation box 81 is usually insulated with high-efficiency insulation materials (such as ceramic fiber, rock wool, etc.). These insulation materials can effectively reduce heat conduction and prevent rapid heat loss. In addition, a heat insulation design is made on the safe body to reuse the discharged waste heat, which can improve energy utilization efficiency.

[0043] The present invention also provides a method for using the stirring device, comprising the following steps:

[0044] S1, start the conveyor belt 8 to transport the material, use the guide plate 2 to guide the material into the mixing drum 1, and cover the feed port 11 after the material is transported;

[0045] S2, adjusting the stirring blade 3 and the guide plate 2 so that the guide plate 2 is placed horizontally, rotating any one of the plurality of stirring blades 3 to the highest point and vertically placing the stirring blade 3 below the guide plate 2;

[0046] S3, calculating the angle between two adjacent stirring blades 3 and the time T required for each stirring blade 3 to rotate through the angle according to the number of stirring blades 3 and the rotation speed of the stirring blades 3;

[0047] S4, driving the stirring blade 3 and the horizontally placed guide plate 2 to rotate simultaneously, and the guide plate 2 rotates 180 degrees within the time T;

[0048] S5. When the guide plate 2 rotates in the lower half of its rotation area, the hot air blower 6 is synchronously started to transport hot air to the air duct 21 of the guide plate 2. When the guide plate 2 rotates in the upper half of its rotation area, the hot air blower 6 stops transporting hot air to the air duct 21 of the guide plate 2.

[0049] Furthermore, in step S1, the height of the stacked materials after entering the mixing drum 1 is less than the radius of the mixing drum 1, or the height of the stacked materials is not higher than the height of the stirring blade 3, so that when the stirring blade 3 rotates downward, the stirring blade 3 contacts the asphalt, and when the stirring blade 3 rotates upward, the stirring blade 3 contacts the hot air; that is, the stirring blade 3 contacts the asphalt after being heated by the hot air;

[0050] In step S2, the interior of the mixing drum 1 is configured to be divided into an upper half and a lower half along the diameter of the mixing drum 1 which is horizontally arranged. The material is located in the lower half of the mixing drum 1, and the stirring blade 3 and the guide plate 2 which are at the highest point are located in the upper half. The guide plate 2 is placed horizontally, and a stirring blade 3 is vertically arranged below the guide plate 2 to achieve positioning. It can be understood that the guide plate 2 will continuously rotate in the process of guiding the asphalt. If the guide plate 2 and the stirring blade 3 are not positioned, it will be difficult to achieve the subsequent effect, that is, the guide plate 2 is in the process of rotating downward (rotating in the direction close to the stirring blade 3), and the air channel 21 on the end face of the guide plate 2 discharges hot air outward. If the guide plate 2 and the stirring blade 3 are started at the same time, the hot air will be briefly concentrated between two adjacent stirring blades 3 and extend in front of the rotating shaft. The stirring blade 3 which continues to rotate will directly contact with the hot air and absorb heat. Preferably, the temperature of the hot air delivered by the hot air blower 6 is 150-230 degrees Celsius, and the hot air temperature can be flexibly adjusted to adapt by setting a temperature sensor in the mixing drum 1;

[0051] If the guide plate 2 and the stirring blade 3 are not positioned, although the guide plate 2 and the stirring blade 3 do not interfere with each other in rotation, the hot air output by the guide plate 2 may be blocked by the stirring blade 3 closest to the guide plate 2, which may easily lead to heat concentration and affect the stirring blade 3, and also weaken the influence of the hot air on the stirring blade 3 far away from the guide plate 2. Therefore, the positioning step of the guide plate 2 and the stirring blade 3 is indispensable. Regarding the positioning of the guide plate 2 and the stirring blade 3, a CCD camera for shooting and capturing the guide plate 2 and the stirring blade 3 or an infrared sensor can be installed on the mixing drum 1;

[0052] Since the air passage 21 continuously outputs hot air and under the influence of the rotation of the guide plate 2, the hot air and harmful exhaust gas generated during the heating and stirring process of the asphalt will flow toward the air outlet 12, and then flow out through the air outlet 12;

[0053] In step S3, the number of stirring blades 3 of the present invention is three, and the angle between two adjacent stirring blades 3 is 120 degrees. On this basis, combined with the rotation speed, the time T required for each stirring blade 3 to rotate 120 degrees can be calculated; by adjusting the rotation speed of the motor 7, it can be ensured that within the time T, the guide plate 2 rotates downward 180 degrees, and the hot air blower 6 is started synchronously when the guide plate 2 starts to rotate in the horizontal position. After the guide plate 2 rotates 180 degrees, the hot air blower 6 stops providing hot air to the guide plate 2. In the present invention, guide plates 2 are installed on opposite sides of the rotating shaft 4, and the rotating shaft 4 has two flow channels 41 inside, which are respectively connected to the air channels 21 of the two guide plates 2. The hot air blower 6 provides hot air to the two flow channels 41 in turn to avoid the hot air blowing toward the inner wall of the mixing drum 1, thereby preventing the inner wall of the mixing drum 1 from overheating.

[0054] In the present invention, the guide plate 2 is made of a highly thermally conductive metal. The metal guide plate 2 can withstand the impact of falling asphalt. The thermal conductivity can also be used to heat the guide plate 2 with hot air, so that the guide plate 2 is not easily adhered to asphalt.

[0055] It should be noted that the terms "first", "second", etc. in this document are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0056] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. An asphalt mixing device, characterized in that: The invention comprises a mixing drum, a guide plate, a rotating shaft, a rotary joint, a hot air blower and a motor. The interior of the mixing drum is provided with three mixing blades which are equidistantly distributed in a ring shape. The interior of the mixing drum is provided with a rotating shaft. The three mixing blades are connected to the surface of the rotating shaft, and the mixing blades are driven by the rotating shaft to rotate circumferentially. The opposite ends of the top surface of the mixing drum are respectively provided with a feed port and an air outlet. The guide plate is rotatably arranged between the feed port and the mixing blades. The end surface of the guide plate is provided with an air channel. The rotating shaft is penetrated by the mixing drum and rotatably cooperates with the mixing drum. The guide plate and the rotary joint are respectively connected to the rotating shaft. The interior of the rotating shaft is provided with a flow channel, and the air channel is communicated with the rotary joint through the flow channel. The hot air blower and the motor are respectively connected to the rotary joint. The mixing drum and the rotating shaft are both horizontally arranged.

2. An asphalt mixing device according to claim 1, characterized in that: The stirring blade and the guide plate are respectively arranged to rotate in two mutually perpendicular directions.

3. An asphalt mixing device according to claim 2, characterized in that: The rotary joint includes a shell and a rotary tube, one end of the rotary tube is rotatably connected to the shell, the outer side of the other end of the rotary tube is transmission-coordinated with the motor, and the end surface of the other end of the rotary tube is connected to the rotating shaft to make the rotary tube conduct with the flow channel.

4. An asphalt mixing device according to claim 3, characterized in that: It also includes a conveyor belt for transporting materials, and the conveyor belt is arranged above the feed port.

5. An asphalt mixing device according to claim 4, characterized in that: It also includes an air filter device and a pipeline, wherein the air filter device is installed at the air outlet, one end of the pipeline is connected to the air filter device, the other end of the pipeline extends to the side of the conveyor belt, and the pipe mouth of the pipeline is arranged toward the conveyor belt.

6. An asphalt mixing device according to claim 5, characterized in that: It also includes an insulation box body, the end face of which is provided with an opening, the conveyor belt passes through the insulation box body through the opening, and the pipeline is connected to the insulation box body; the guide plates are installed on the opposite sides of the rotating shaft, the interior of the rotating shaft has two flow channels and is respectively connected to the air channels of the two guide plates, and the hot air blower provides hot air to the two flow channels in turn.

7. A method for using a stirring device, applied to the asphalt stirring device according to claim 6, characterized in that: The following steps are involved: S1. Start the conveyor belt to transport the material, and use the guide plate to guide the material into the mixing drum; S2. Adjust the stirring blade and the guide plate so that the guide plate is placed horizontally, rotate any one of the three stirring blades to the highest point and set the stirring blade vertically below the guide plate; the interior of the mixing drum is configured to be divided into an upper half and a lower half along the diameter of the mixing drum set horizontally, the material is located in the lower half of the mixing drum, and the stirring blade at the highest point is located in the upper half; S3, calculating the angle between two adjacent stirring blades and the time T required for each stirring blade to rotate through the angle according to the number of stirring blades and the rotation speed of the stirring blades; S4, driving the stirring blade and the horizontal guide plate to rotate simultaneously, and the guide plate rotates 180 degrees within time T; S5. When the guide plate rotates in the lower half of its rotation area, the hot air blower is synchronously started to transport hot air into the air passage of the guide plate. When the guide plate rotates in the upper half of its rotation area, the hot air blower stops transporting hot air to the air passage of the guide plate.

8. The method for using a stirring device according to claim 7, characterized in that: In step S1, the feed inlet is covered after the material is conveyed.

9. The method for using a stirring device according to claim 7, characterized in that: The temperature of the hot air delivered by the hot air blower is 150-230 degrees Celsius.

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