An automatic asphalt mixture dry modifier adding device

Abstract

The utility model relates to an asphalt mixture dry method modifier automatic adding device, it includes storage bin, the discharge opening intercommunication of storage bin has screw feeder, is provided with microwave heating assembly at the discharge opening of screw feeder, the outlet of microwave heating assembly is connected with the mixing pot through the heat preservation delivery pipe, the one end of heat preservation delivery pipe near microwave heating assembly is connected with compressed air purging system, and screw feeder, microwave heating assembly, compressed air purging system all are electrically connected with control system, the utility model has realized the high efficiency, precision and cleanification of modifier adding process, has effectively promoted production efficiency, mixture quality and the long -term stability of equipment operation.

Description

Technical Field

[0001] This utility model relates to the technical field of road engineering material production equipment, and in particular to an automatic addition device for dry modifiers of asphalt mixtures. Background Technology

[0002] In the field of road engineering, the performance of asphalt mixtures directly determines the load-bearing capacity, durability, and resistance to road damage. As a key material for improving the high-temperature stability, low-temperature crack resistance, and water stability of asphalt mixtures, the rationality and efficiency of the addition process of dry modifiers are crucial to the quality of road construction. Therefore, configuring a dedicated modifier addition device in asphalt mixing plants has become a necessary link to achieve accurate and efficient addition of modifiers and ensure the quality of road engineering. In particular, with the continuous improvement of road construction standards, traditional manual addition methods are gradually being replaced by automated addition devices due to problems such as high labor intensity, large addition errors, and low efficiency.

[0003] While some existing asphalt mixing plants are equipped with automatic asphalt mixture modifier addition devices, which alleviates some of the drawbacks of manual addition, several shortcomings remain in practical application: Cold modifiers are directly added to the mixing pot, requiring extended dry-mixing time to ensure thorough mixing with the high-temperature liquid asphalt. This involves using the high-temperature mixing process of heated aggregates and modifiers to melt the added modifiers. In some cases, each batch requires an additional 10-30 seconds of dry-mixing time, directly reducing the overall production efficiency of asphalt mixtures (by 10% to 50%). The limitations imposed by existing modifier addition devices on the market restrict the production capacity of asphalt mixing plants. These devices only offer automatic weighing and addition, lacking temperature control capabilities. They cannot pre-adjust the modifier to its optimal activation temperature based on its characteristics, impacting asphalt mixture production efficiency and posing a risk of overheating during mixing. This could lead to performance degradation of temperature-sensitive modifiers, affecting mixture quality. Furthermore, modifier residues easily remain in the delivery pipelines after production, absorbing moisture and caking upon cooling, causing blockages that require manual cleaning—a time-consuming, labor-intensive process that can easily disrupt production. Therefore, an automated addition device capable of preheating, precisely controlling the temperature, and automatically cleaning the modifier is urgently needed to address these issues. Utility Model Content

[0004] To address the shortcomings of existing additive technologies, the purpose of this invention is to provide an automatic additive device for dry asphalt mixtures, which achieves high efficiency, precision, and cleanliness in the additive process, effectively improving production efficiency, mixture quality, and long-term stability of equipment operation.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] An automatic addition device for dry asphalt mixture modifiers includes a storage silo, the outlet of which is connected to a screw feeder, and a microwave heating component is installed at the outlet of the screw feeder; the outlet of the microwave heating component is connected to a mixing pot via an insulated conveying pipe; a compressed air purging system is connected to one end of the insulated conveying pipe near the microwave heating component; the screw feeder, microwave heating component, and compressed air purging system are all electrically connected to a control system.

[0007] The above technical solution automates the entire process of modifier production, from storage and quantitative feeding to microwave preheating and conveying. It also integrates a compressed air self-cleaning function to reduce manual intervention, shorten dry mixing time, avoid pipeline blockage, and improve production efficiency and equipment operation stability.

[0008] As a further technical solution of this utility model: the microwave heating assembly includes a microwave heating cavity and a microwave generator; the microwave generator is fixedly installed on the top of the outside of the microwave heating cavity, and the microwave generator is electrically connected to the control system.

[0009] The above technical solution utilizes microwaves to heat the modifier rapidly and uniformly, ensuring heating efficiency and quality, and laying the foundation for subsequent precise temperature control.

[0010] As a further technical solution of this utility model: the inner wall of the microwave heating cavity is smooth and inclined.

[0011] The above technical solution ensures that the modifier flows smoothly and without residue in the cavity by gravity, which not only prevents material adhesion and coking, but also simplifies the equipment structure.

[0012] As a further technical solution of this utility model: the microwave heating cavity is made of stainless steel.

[0013] By utilizing the corrosion resistance and wear resistance of stainless steel, the service life of the microwave heating cavity can be extended, and the corrosion of the cavity by materials can be prevented from affecting the long-term operation of the equipment.

[0014] As a further technical solution of this utility model: a temperature sensor is provided at the discharge port inside the microwave heating cavity, and the temperature sensor is electrically connected to the control system.

[0015] The above technical solution provides real-time data feedback for achieving closed-loop temperature control, which is crucial for ensuring accurate and stable heating temperature of the modifier.

[0016] As a further technical solution of this utility model: the compressed air purging system includes an air compressor, a solenoid valve, and a purging pipeline;

[0017] The air outlet of the air compressor is connected to the air inlet of the solenoid valve; the air outlet of the solenoid valve is connected to the air inlet of the purge pipe, and the air outlet of the purge pipe is connected to the heat-insulating conveying pipe.

[0018] The solenoid valve is electrically connected to the control system.

[0019] The above technical solution enables automatic and thorough cleaning of the conveying pipeline during production breaks or at the end of production, fundamentally avoiding pipeline blockage and ensuring the continuity and stability of production.

[0020] As a further technical solution of this utility model: the core controller of the control system is a PLC or an industrial microcontroller.

[0021] The above technical solutions ensure the stability and accuracy of the automated control of the equipment, avoid production anomalies caused by controller failures, and improve the reliability of equipment operation.

[0022] As a further technical solution of this utility model: the control system is provided with a human-machine interface, and the human-machine interface is communicatively connected to the control system.

[0023] The above technical solutions provide an operating interface for human-computer interaction, making it convenient for staff to preset parameters (such as target temperature and feed rate) and view the equipment's operating status in real time, reducing the difficulty of operation, further improving the intelligence level of the device, and reducing the cost of manual intervention.

[0024] In summary, this utility model has at least one of the following beneficial technical effects:

[0025] 1. This utility model discloses an automatic addition device for dry asphalt mixture modifiers. It integrates a storage silo, a screw feeder, a microwave heating component, an insulated conveying pipe, a compressed air purging system, and a control system to construct a fully automated device for the entire process of modifier addition, from storage, quantitative feeding, microwave preheating to conveying. It also links the pipeline self-cleaning function to reduce manual intervention, shorten dry mixing time, avoid pipeline blockage, and improve the production efficiency and equipment operation stability of the mixing plant.

[0026] 2. This utility model discloses an automatic addition device for dry modifiers of asphalt mixtures. By setting a temperature sensor at the discharge port inside the microwave heating cavity and electrically connecting it to the control system, and using a PLC or industrial single-chip microcomputer control core, it can realize real-time monitoring and closed-loop control of the preheating temperature of the modifier, avoid overheating and damage to the activity of the modifier, and improve the quality of the finished product and the safety of equipment operation.

[0027] 3. This utility model discloses an automatic addition device for dry modifiers of asphalt mixtures. It is equipped with a compressed air purging system containing an air compressor, a solenoid valve and a purging pipeline, and is linked with the control system to realize automatic triggering of purging, so as to thoroughly remove residual modifiers in the insulated delivery pipe, prevent pipeline blockage, reduce manual maintenance workload and avoid production interruption. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of an automatic addition device for dry asphalt mixture modifier according to Embodiment 1 of this utility model.

[0029] Figure 2 for Figure 1 A schematic diagram of the internal structure of a spiral feeder.

[0030] Figure 3 This is the control logic diagram of an automatic addition device for dry asphalt mixture modifiers according to the present invention.

[0031] Reference numerals: 1. Storage silo; 2. Screw feeder; 3. Microwave heating assembly; 31. Microwave heating cavity; 32. Microwave generator; 4. Insulated conveying pipe; 5. Mixing pot; 6. Compressed air purging system; 61. Air compressor; 62. Solenoid valve; 63. Purging pipeline; 7. Control system; 8. Temperature sensor. Detailed Implementation

[0032] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0033] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] Example 1:

[0036] Reference Figure 1 and Figure 2 This utility model discloses an automatic addition device for dry-process asphalt mixture modifiers, including a storage silo 1 for storing modifiers. The outlet of the storage silo 1 is connected to a screw feeder 2 for quantitative delivery of the modifiers. The screw feeder 2 ensures the accuracy of the amount of modifier added in each batch. A microwave heating assembly 3 for preheating the modifiers is installed at the outlet. The microwave heating assembly 3 consists of a microwave heating cavity 31 and a microwave generator 32. The microwave generator 32 is fixedly installed on the top of the microwave heating cavity 31, allowing microwave energy to precisely act on the modifiers inside the microwave heating cavity 31, efficiently completing preheating and laying the foundation for shortening subsequent dry-mixing time and increasing production capacity. The inner wall of the microwave heating cavity 31 is smooth (inner wall roughness Ra≤0.8μm) and inclined at 35°-40°, which can avoid the modification... The modifier adheres to the inner wall while ensuring smooth material flow, effectively preventing uneven heating or pipe blockage caused by residue accumulation. Simultaneously, the cavity is made of stainless steel, whose excellent corrosion resistance and wear resistance significantly extend its service life, preventing the modifier from corroding the cavity and affecting the long-term stable operation of the equipment. The outlet of the microwave heating component 3 is connected to the mixing pot 5 via an insulated conveying pipe 4 to maintain the modifier temperature, ensuring that the preheated modifier does not lose temperature during transport and maintains optimal activity upon entering the mixing pot 5. A temperature sensor 8 is installed at the outlet inside the microwave heating cavity 31, electrically connected to the control system 7. This sensor collects the modifier temperature in real time and feeds back the signal to the control system 7, providing data support for closed-loop temperature control and ensuring the modifier temperature remains stable within the preset range, preventing overheating and damage to its activity.

[0037] The end of the insulated conveying pipe 4 closest to the microwave heating component 3 is connected to a compressed air purging system 6. This system includes an air compressor 61 that provides a high-pressure air source, a solenoid valve 62 that controls the airflow, and a purging pipe 63 that delivers compressed air. The outlet of the air compressor 61 is connected to the inlet of the solenoid valve 62, and the outlet of the solenoid valve 62 is connected to the inlet of the purging pipe 63. The outlet of the purging pipe 63 is connected to the insulated conveying pipe 4. The solenoid valve 62 is electrically connected to the control system 7, which precisely controls the purging action. The screw feeder 2, the microwave heating component 3, and the compressed air purging system 6 are all electrically connected to the control system 7. The control system 7 uses a highly reliable PLC or industrial microcontroller as the core controller to ensure the stability and accuracy of automated control.

[0038] Meanwhile, the control system 7 is equipped with a human-machine interface, which prioritizes the use of an industrial-grade touch screen (HMI touch screen) to facilitate staff in setting parameters (such as target temperature and amount added) and viewing the equipment's operating status, further improving the intelligence level of the device and reducing manual intervention.

[0039] The above structure enables full automation of the modifier process, from storage and quantitative feeding to microwave preheating and transportation, while simultaneously integrating pipeline self-cleaning function, effectively improving production efficiency and equipment stability.

[0040] The usage process of this utility model: When using this device, refer to... Figure 2First, staff preset production parameters through the human-machine interface of control system 7, including the amount of modifier added per tray and the target preheating temperature (usually 150-190℃, adjustable depending on the type of modifier). After the parameters are set, control system 7 sends a start signal to screw feeder 2. Screw feeder 2 quantitatively delivers modifier from storage silo 1 to microwave heating cavity 31 of microwave heating component 3. Simultaneously, control system 7 controls microwave generator 32 to start, heating the modifier in the cavity. During this process, temperature sensor 8 at the outlet of microwave heating cavity 31 monitors the modifier temperature in real time and feeds the temperature signal back to control system 7. Control system 7 dynamically adjusts the power of microwave generator 32 through PID control algorithm to keep the actual outlet temperature of modifier constant at the preset target value. The precisely preheated modifier is then discharged from the microwave... The heating chamber 31 outlet enters the insulated conveying pipe 4. Under the insulation effect of the insulated conveying pipe 4, the modifier maintains its temperature and is conveyed into the mixing pot 5, completing a single addition. If the single purging function is preset, after the single addition is completed, the control system 7 will briefly open the solenoid valve 62. The compressed air generated by the air compressor 61 enters the insulated conveying pipe 4 through the solenoid valve 62 and the purging pipe 63 to purge the residual powder in the pipe. When the control system 7 receives the production end signal of the mixing station or the staff manually triggers the purging, it will first shut down the screw feeder 2 and the microwave generator 32, and then open the solenoid valve 62. It usually lasts for 10 to 30 seconds. The compressed air generated by the air compressor 61 rushes into the insulated conveying pipe 4 at high speed, thoroughly blowing the residual modifier into the mixing pot 5, completing the self-cleaning of the pipeline. Then the solenoid valve 62 closes and the device automatically enters the standby state.

[0041] This utility model focuses on three core functions: automated conveying and preheating, precise temperature control, and automatic purging. The specific implementation principle is as follows: Storage silo 1 provides a stable storage space for the modifier. Under the control of the control system 7, the screw feeder 2 quantitatively conveys the modifier to the microwave heating component 3. The microwave heating component 3 generates high-frequency microwaves through its internal microwave generator 32, causing the polar molecules within the modifier to vibrate rapidly and generate heat, thus achieving rapid and uniform preheating. Simultaneously, the heat-insulating conveying pipe 4 reduces heat loss during the conveying process, ensuring that the modifier remains at a suitable temperature when entering the mixing pot 5. This shortens the dry mixing time and improves production efficiency. Specifically, it can reduce the dry mixing time of asphalt mixture to 3-5 seconds, significantly improving the production efficiency of the mixture. During this process, the temperature sensor 8 collects real-time data on the modifier at the outlet of the microwave heating component 3. The modifier temperature is measured and the signal is transmitted to the control system 7, which is based on a PLC or industrial microcontroller. The control system 7 uses a PID algorithm to compare the deviation between the actual temperature and the target temperature, and dynamically adjusts the power of the microwave generator 32 to form a closed-loop control. This completely avoids the risk of overheating of the modifier, ensures its activity and equipment safety, and further improves the modification effect and the quality of the finished product. At the same time, the air compressor 61 provides a high-pressure air source. The control system 7 controls the solenoid valve 62 to open according to a preset program (such as after a single addition or at the end of production). Compressed air enters the insulated delivery pipe 4 through the purging pipeline 63. The impact force of the high-speed airflow pushes the residual modifier in the pipe toward the mixing pot 5 to achieve self-cleaning without manual intervention. This reduces maintenance workload and the risk of production interruption, and also avoids long-term adhesion and corrosion of the pipeline by the modifier, thus extending the service life of the equipment.

[0042] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. An automatic addition device for dry-process asphalt mixture modifiers, characterized in that, The system includes a storage silo (1), the outlet of which is connected to a screw feeder (2), and a microwave heating component (3) is installed at the outlet of the screw feeder (2); the outlet of the microwave heating component (3) is connected to a mixing pot (5) through a heat-insulated conveying pipe (4); a compressed air purging system (6) is connected to one end of the heat-insulated conveying pipe (4) near the microwave heating component (3); the screw feeder (2), the microwave heating component (3), and the compressed air purging system (6) are all electrically connected to a control system (7).

2. The automatic addition device for dry asphalt mixture modifiers according to claim 1, characterized in that, The microwave heating assembly (3) includes a microwave heating cavity (31) and a microwave generator (32); the microwave generator (32) is fixedly installed on the top of the microwave heating cavity (31), and the microwave generator (32) is electrically connected to the control system (7).

3. The automatic addition device for dry asphalt mixture modifiers according to claim 2, characterized in that, The inner wall of the microwave heating cavity (31) is smooth and inclined.

4. The automatic addition device for dry asphalt mixture modifiers according to claim 2, characterized in that, The microwave heating cavity (31) is made of stainless steel.

5. An automatic addition device for dry asphalt mixture modifiers according to claim 3 or 4, characterized in that, A temperature sensor (8) is installed at the outlet of the microwave heating cavity (31), and the temperature sensor (8) is electrically connected to the control system (7).

6. The automatic addition device for dry asphalt mixture modifiers according to claim 1, characterized in that, The compressed air purging system (6) includes an air compressor (61), a solenoid valve (62), and a purging pipeline (63); The air outlet of the air compressor (61) is connected to the air inlet of the solenoid valve (62); the air outlet of the solenoid valve (62) is connected to the air inlet of the purge pipe (63), and the air outlet of the purge pipe (63) is connected to the heat-insulating conveying pipe (4). The solenoid valve (62) is electrically connected to the control system (7).

7. The automatic addition device for dry asphalt mixture modifiers according to claim 1, characterized in that, The core controller of the control system (7) is a PLC or an industrial microcontroller.

8. The automatic addition device for dry asphalt mixture modifiers according to claim 1, characterized in that, The control system (7) is equipped with a human-machine interface, and the human-machine interface is communicatively connected to the control system (7).

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