Modified asphalt constant-temperature storage anti-caking device

Abstract

The utility model discloses a modified asphalt constant-temperature storage anti-caking device, and belongs to the technical field of asphalt storage. The modified pitch constant-temperature storage anti-caking device comprises a closed storage tank, a central shaft, a spiral blade, a heat conduction plate, an annular heating cavity and a heat preservation shell. The central shaft is connected with the storage tank through a bearing; helical blades are arranged on the outer side of the central shaft; the heat-conducting plate is fixed on the inner wall of the storage tank; the surface corrugated groove design improves the heat conduction efficiency; an electric heating wire is arranged in the annular heating cavity and is connected with a heat-conducting oil circulating system, so that the heating uniformity is ensured; the heat preservation shell is provided with adjustable heat dissipation holes, and dynamic balance of the temperature is achieved. The modified asphalt constant-temperature storage device can effectively prevent the caking problem caused by uneven heating or local cooling of asphalt, has the characteristics of compact structure, high heat conduction efficiency and high practicability, and is suitable for constant-temperature storage of modified asphalt.

Description

Technical Field

[0001] This utility model relates to the field of asphalt storage technology, and in particular to a device for preventing caking of modified asphalt during constant temperature storage. Background Technology

[0002] With the development of asphalt storage technology, various storage devices for modified asphalt, emulsified asphalt, and other materials have emerged to meet the needs of different engineering scenarios for asphalt performance and construction efficiency. However, some problems still exist in practical applications, especially the tendency for modified asphalt to clump during long-term storage, which affects its performance and construction quality.

[0003] A search revealed a patent (CN116605545B) for an asphalt material storage device. This device uses a mixing frame and a drive rod in conjunction, with a lifting mechanism to achieve reciprocating motion, thereby reducing the solidification of asphalt during storage. However, this solution primarily relies on mechanical stirring to prevent asphalt solidification, lacking measures for constant temperature control, and thus failing to fundamentally solve the problem of asphalt agglomeration caused by temperature fluctuations. Furthermore, the device does not consider the potential for localized cooling of asphalt during prolonged static storage, resulting in limited stirring effectiveness and making it unsuitable for the long-term stable storage requirements of high-viscosity modified asphalt.

[0004] Additionally, a modified asphalt mixing and storage device and method with patent number CN110577031B was found. This device is equipped with a heating mechanism and a temperature control mechanism, and combines an insulation layer to insulate the asphalt. Simultaneously, an admixture is added through a shaking screen structure to improve the asphalt storage stability. However, this design still has certain limitations: firstly, its heating system only heats the curved surface of the tank, resulting in a limited heating area and potentially uneven heating of the asphalt within the tank; secondly, although the device has some insulation capabilities, it does not form a closed-loop constant temperature control system, making it difficult to automatically adjust the heating power according to real-time changes in the asphalt temperature. Therefore, under drastic changes in the external environment, localized overcooling or overheating of the asphalt may still occur, leading to clumping or aging problems.

[0005] In summary, existing asphalt storage devices mostly employ stirring or localized heating to prevent asphalt from solidifying. However, when facing the long-term storage requirements of modified asphalt, a material prone to caking and with high viscosity, problems such as uneven heating, low temperature control precision, and lack of intelligent feedback mechanisms still exist. Therefore, there is an urgent need for a new type of storage device that can achieve constant temperature control and effectively prevent asphalt caking, in order to improve the storage stability and reliability of modified asphalt. Utility Model Content

[0006] The purpose of this invention is to provide a device for preventing caking of modified asphalt under constant temperature storage. This device solves the problems of uneven heating, insufficient temperature fluctuation control, and caking caused by local cooling in the prior art by combining mechanical structure and heat conduction design.

[0007] To achieve the above objectives, this utility model is implemented according to the following technical solution:

[0008] This utility model includes a closed storage tank with a central shaft inside. The central shaft passes through the top of the tank and extends to the bottom, and is connected to the top of the tank by a bearing to achieve rotation. Helical blades are fixedly installed on the outer side of the central shaft, and the helical blades are distributed along the axial direction of the central shaft. A gap is left between the outer edge of the helical blades and the inner wall of the tank to form a continuous material flow channel.

[0009] Heat-conducting plates are installed on the inner wall of the storage tank, evenly distributed along the circumference of the inner wall and fixed to it with bolts. The surface of the heat-conducting plates is machined with transverse corrugated grooves, designed to increase the heat conduction area and promote heat transfer. The inner end of the heat-conducting plate contacts the outer edge of the helical blades; the contact area is connected using a gasket made of a high thermal conductivity material to reduce thermal resistance and improve heat conduction efficiency.

[0010] The storage tank is encased in an insulated shell, with insulation material filling the space between the insulated shell and the outer wall of the tank. Multiple ventilation holes are located on the outer side of the insulated shell, and each ventilation hole is equipped with an adjustable baffle. The baffle is connected to the insulated shell via hinges, and the opening and closing angle of the baffle can be adjusted manually or automatically.

[0011] An annular heating chamber is located at the bottom of the storage tank. The inner wall of the annular heating chamber is tightly fitted to the outer wall of the tank bottom, and the two are connected by welding. Electric heating wires are installed inside the annular heating chamber, evenly distributed along the circumference of the chamber, with each end of the wire connected to a power controller. A heat transfer oil inlet and outlet are located at the bottom of the annular heating chamber, and both are connected to an external heat transfer oil circulation system to achieve continuous circulation of the heat transfer oil.

[0012] The top of the central shaft is connected to the drive motor via a coupling. The drive motor is fixedly mounted on a bracket on the top of the storage tank, and the bracket is bolted to the top of the storage tank. The output shaft of the drive motor and the central shaft rotate synchronously via a coupling. Both ends of the coupling are provided with keyways, and flat keys are installed in the keyways to ensure stable transmission of torque.

[0013] The storage tank has a feed inlet at the top, which connects to an external conveying pipeline via a flange. A filter screen with a mesh size of 40-60 is installed inside the feed inlet to intercept large particles. The storage tank also has a discharge outlet at the bottom, which connects to the external conveying pipeline via a valve. The valve is a ball valve, and a sealing ring made of high-temperature resistant rubber seals the valve core and body.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This invention achieves two core functions—uniform mixing and efficient heating—through the design of key components. The storage tank utilizes a stepped distribution of spiral blades, allowing the modified asphalt to flow at different speeds at different heights, effectively preventing localized cooling. The continuous rotation of the spiral blades on the central shaft propels the material to achieve a uniform mixing effect, ensuring thorough mixing. The heat-conducting plate has corrugated grooves on its surface, increasing the heat transfer area. Its contact design with the spiral blades significantly improves heat transfer efficiency, ensuring uniform heating of the material. The electric heating wire in the annular heating chamber generates heat, which is evenly transferred to the bottom of the storage tank through a heat-conducting oil circulation system, further enhancing the uniformity and stability of heating. The external insulation shell of the storage tank, combined with heat-insulating materials, effectively reduces heat loss. Adjustable heat dissipation holes are also provided to achieve dynamic temperature balance, ensuring a balanced temperature inside and outside the tank. The drive motor rotates the central shaft via a coupling, achieving continuous mixing and heating of the material, while valves control the sealing during the discharge process. In summary, this device, through its reasonable structural design and efficient working principle, effectively solves the problem of asphalt caking caused by uneven heating or localized cooling. It features a compact structure and high heat conduction efficiency, making it suitable for constant-temperature storage and anti-caking of modified asphalt. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the structure of the thermal insulation shell of this utility model without a baffle.

[0018] Figure 3 This is a cross-sectional schematic diagram of the storage tank of this utility model.

[0019] Figure 4 This is a schematic diagram of the annular heating cavity of this utility model.

[0020] Figure 5 This is a cross-sectional schematic diagram of the annular heating element of this utility model.

[0021] Figure 6 This is a schematic diagram of the structure of the heat-conducting plate of this utility model.

[0022] In the above figures, the component names corresponding to the reference numerals are as follows:

[0023] 1. Storage tank; 2. Central shaft; 3. Spiral blades; 4. Heat-conducting plate; 5. Insulation shell; 6. Heat dissipation holes; 7. Baffle; 8. Annular heating chamber; 9. Electric heating wire; 10. Heat transfer oil inlet; 11. Heat transfer oil outlet; 12. Drive motor; 13. Feed inlet; 14. Filter screen; 15. Discharge outlet; 16. Valve. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of those features. In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship 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.

[0026] Example

[0027] like Figure 1-6 As shown, storage tank 1 is a closed structure with a cylindrical shape to enhance pressure resistance and structural stability. A central shaft 2 extends from the top to the bottom of storage tank 1, and is rotatably connected to the top of storage tank 1 via a bearing. The bearing is installed at the center of the top of storage tank 1, with its inner ring fixedly connected to the central shaft 2, and its outer ring embedded in a bearing seat on the top of storage tank 1, ensuring smooth rotation of the central shaft 2. The top of the central shaft 2 is connected to a drive motor 12 via a coupling. The drive motor 12 is fixedly mounted on a bracket on the top of storage tank 1, and the bracket is securely connected to the top of storage tank 1 via bolts. Keyways are provided at both ends of the coupling, with flat keys installed within the keyways to ensure stable transmission of torque.

[0028] A helical blade 3 is fixedly installed on the outer side of the central shaft 2. The helical blade 3 is distributed along the axial direction of the central shaft 2. The rotation of the helical blade 3 avoids local cooling. A gap is left between the outer edge of the helical blade 3 and the inner wall of the storage tank 1. The purpose of this gap is to provide a continuous flow channel for the material and at the same time prevent the helical blade 3 from rubbing against the inner wall of the storage tank 1.

[0029] Several heat-conducting plates 4 are installed on the inner wall of the storage tank 1. The heat-conducting plates 4 are evenly distributed along the circumference of the inner wall of the storage tank 1 and are fixed to the inner wall of the storage tank 1 with bolts. The surface of the heat-conducting plates 4 is machined with corrugated grooves, the depth of which is 1-2 mm. The design of the corrugated grooves increases the heat conduction area and facilitates rapid heat transfer. The inner end of the heat-conducting plate 4 contacts the outer edge of the spiral blade 3. The contact part is connected by a gasket made of a high thermal conductivity material. The gasket is fixed between the heat-conducting plate 4 and the spiral blade 3 with screws to reduce thermal resistance and improve heat conduction efficiency.

[0030] A ring-shaped heating chamber 8 is provided at the bottom of the storage tank 1. The inner wall of the ring-shaped heating chamber 8 is tightly fitted to the outer wall of the bottom of the storage tank 1, and the two are connected by welding. Electric heating wires 9 are installed inside the ring-shaped heating chamber 8, and are evenly distributed along the circumference of the ring-shaped heating chamber 8. Both ends of the electric heating wires 9 are connected to a power controller. A heat transfer oil inlet 10 and a heat transfer oil outlet 11 are provided at the bottom of the ring-shaped heating chamber 8. The heat transfer oil inlet 10 and the heat transfer oil outlet 11 are respectively connected to an external heat transfer oil circulation system to achieve continuous circulation of the heat transfer oil. The operation of the heat transfer oil circulation system is driven by an external pump. When the heat transfer oil flows in the ring-shaped heating chamber 8, it absorbs the heat generated by the electric heating wires 9 and evenly transfers the heat to the bottom of the storage tank 1.

[0031] The storage tank 1 is externally encased in an insulated shell 5, with a 20-30 mm thick insulating material filling the space between the insulated shell 5 and the outer wall of the storage tank 1. Multiple ventilation holes 6 are provided on the outer side of the insulated shell 5, each equipped with an adjustable baffle 7. The baffle 7 is connected to the insulated shell 5 via a hinge, and its opening angle can be adjusted manually or automatically. The baffle can be manually opened or adjusted by an electric push rod, with an adjustment range of 0° to 90°. When the internal temperature of the storage tank 1 is too high, adjusting the opening of the baffle 7 increases the ventilation through the ventilation holes 6, thereby reducing the internal temperature of the storage tank 1; conversely, when the internal temperature of the storage tank 1 is low, the baffle 7 is closed to reduce heat loss.

[0032] The storage tank 1 has a feed inlet 13 at the top, which is connected to an external conveying pipeline via a flange. A filter screen 14 with a mesh size of 40-60 is installed inside the feed inlet 13 to intercept large particles. The storage tank 1 has a discharge outlet 15 at the bottom, which is connected to the external conveying pipeline via a valve 16. The valve 16 is a ball valve, with a sealing ring made of high-temperature resistant rubber between the valve core and body. The operating handle of the valve 16 is located outside the storage tank 1 for easy manual control of the discharge.

[0033] In actual operation, modified asphalt enters storage tank 1 through inlet 13 via an external conveying pipeline. Filter screen 14 intercepts large particles of impurities in the feed, ensuring the purity of the material inside storage tank 1. After the drive motor 12 starts, it drives the central shaft 2 to rotate via the coupling, and the spiral blades 3 on the central shaft 2 rotate accordingly. The rotation of the spiral blades 3 pushes the modified asphalt in storage tank 1 to flow axially and radially, forming a uniform stirring effect, thereby avoiding localized cooling.

[0034] Meanwhile, the electric heating wire 9 inside the annular heating chamber 8 generates heat after being energized. This heat is evenly transferred to the bottom of the storage tank 1 through the heat transfer oil circulation system, and then diffuses upwards from the bottom of the storage tank 1 to the entire interior of the storage tank 1. The corrugated groove design of the heat-conducting plate 4 and the application of high thermal conductivity gaskets further improve the heat transfer efficiency, allowing the modified asphalt inside the storage tank 1 to be heated evenly. The insulation shell 5 and the heat insulation material effectively reduce heat loss, while the design of the heat dissipation holes 6 and baffles 7 can dynamically adjust the temperature balance inside and outside the storage tank 1 according to actual needs.

[0035] When discharge is required, valve 16 is opened, and the modified asphalt flows out of storage tank 1 through discharge port 15 and enters the external conveying pipeline. Throughout the operation, the connection relationship and coordination design between the various components ensure the stability and reliability of the device, thereby achieving the functions of constant temperature storage and anti-caking of modified asphalt.

[0036] To enable those skilled in the art to fully understand and implement this utility model, the following supplementary explanation of the specific implementation principle of this utility model is provided in conjunction with a specific application scenario.

[0037] First, the modified asphalt enters the storage tank 1 through an external conveying pipeline and inlet 13. During this process, a filter screen 14 installed inside inlet 13 intercepts large particulate impurities in the feed, ensuring that the purity of the material entering the storage tank 1 meets the requirements. After entering the storage tank 1, due to its high viscosity, the modified asphalt is prone to local cooling or clumping if left to stand for a long time. Therefore, it needs to be treated by combining mechanical stirring and heat conduction design.

[0038] After the drive motor 12 starts, it drives the central shaft 2 to rotate via the coupling, and the spiral blades 3 on the central shaft 2 rotate accordingly. The rotation of the spiral blades 3 pushes the modified asphalt in the storage tank 1 to flow axially and radially, forming a uniform mixing effect, thereby avoiding localized cooling caused by material settling. In addition, a gap is left between the outer edge of the spiral blades 3 and the inner wall of the storage tank 1. This design not only provides a continuous flow channel for the material, but also effectively prevents friction between the spiral blades 3 and the inner wall of the storage tank 1, extending the service life of the equipment.

[0039] Meanwhile, the electric heating wire 9 inside the annular heating chamber 8 generates heat after being energized, and the heat is evenly transferred to the bottom of the storage tank 1 through the heat transfer oil circulation system. The heat transfer oil inlet 10 and the heat transfer oil outlet 11 are respectively connected to the external heat transfer oil circulation system. When the heat transfer oil flows in the annular heating chamber 8, it absorbs the heat generated by the electric heating wire 9 and evenly transfers the heat to the bottom of the storage tank 1. The heat-conducting plate 4 installed on the inner wall of the storage tank 1 further improves the heat transfer efficiency. The surface of the heat-conducting plate 4 is machined with corrugated grooves with a depth of 1-2 mm. This design increases the heat conduction area and helps the heat transfer to be rapid. The inner end of the heat-conducting plate 4 contacts the outer edge of the spiral blade 3. The contact part is connected with a gasket made of a high thermal conductivity material to reduce thermal resistance and improve heat conduction efficiency. Through the above design, the modified asphalt in the storage tank 1 can be heated evenly, thereby effectively avoiding the problem of clumping caused by temperature fluctuations.

[0040] The space between the insulation shell 5 enclosing the storage tank 1 and its outer wall is filled with thermal insulation material, which is 20-30 mm thick, effectively reducing heat loss. Multiple ventilation holes 6 are provided on the outer side of the insulation shell 5, each equipped with an adjustable baffle 7. When the internal temperature of the storage tank 1 is too high, adjusting the opening of the baffle 7 increases the ventilation volume of the ventilation holes 6, thereby lowering the internal temperature of the storage tank 1; conversely, when the internal temperature of the storage tank 1 is low, the baffle 7 is closed to reduce heat loss. This dynamic adjustment function ensures the temperature balance between the inside and outside of the storage tank 1, further enhancing the constant temperature control capability of the device.

[0041] When discharge is required, the operator opens valve 16, and the modified asphalt flows out of storage tank 1 through discharge port 15 and enters the external conveying pipeline. Discharge port 15 adopts a ball valve structure, and the valve core and valve body of the ball valve are sealed by a high-temperature resistant rubber sealing ring to ensure good sealing performance even in high-temperature environments. In addition, the operating handle of valve 16 is located outside storage tank 1, which facilitates manual control of the discharge process.

[0042] Throughout operation, the connections and fit between components ensure the stability and reliability of the device. For example, the central shaft 2 is rotatably connected to the top of the storage tank 1 via a bearing. The inner ring of the bearing is fixedly connected to the central shaft 2, while the outer ring is embedded in the bearing housing on the top of the storage tank 1, ensuring smooth rotation of the central shaft 2. The drive motor 12 is connected to the central shaft 2 via a coupling. Keyways are provided at both ends of the coupling, and flat keys are installed within these keyways to ensure stable transmission of torque. These detailed designs not only improve the operating efficiency of the device but also enhance its long-term reliability.

[0043] In summary, this invention achieves uniform mixing and constant-temperature storage of modified asphalt through the design of the spiral blade 3, the corrugated groove structure of the heat-conducting plate 4, and the combination of the annular heating chamber 8 and the heat-conducting oil circulation system. The design of the insulation shell 5 and the heat dissipation holes 6 further optimizes the temperature control capability of the device, enabling it to dynamically adjust the temperature balance inside and outside the storage tank 1 according to actual needs. The overall structure is compact and reasonable, the connection relationship between the components is clear, facilitating actual production and maintenance, and possesses high practical value and promising prospects for promotion.

[0044] It should be noted that all standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Furthermore, since this application is mainly used to protect mechanical devices, this application will not explain the control method and circuit connection in detail.

[0045] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A device for preventing caking of modified asphalt under constant temperature storage, characterized in that, The system includes a storage tank (1), a central shaft (2), and a drive motor (12). The storage tank (1) is a closed structure. The central shaft (2) runs through the top of the storage tank (1) and extends to the bottom. The central shaft (2) is connected to the top of the storage tank (1) by a bearing. A spiral blade (3) is fixedly installed on the outside of the central shaft (2). A heat-conducting plate (4) is provided on the inner wall of the storage tank (1). A high thermal conductivity pad is provided at the contact point between the heat-conducting plate (4) and the spiral blade (3). The storage tank (1) is wrapped with an insulation shell (5). An annular heating chamber (8) is provided at the bottom of the storage tank (1). An electric heating wire (9) is installed inside the annular heating chamber (8). The top of the central shaft (2) is connected to the drive motor (12) through a coupling. A feed inlet (13) is provided at the top of the storage tank (1). A discharge outlet (15) is provided at the bottom of the storage tank (1).

2. The modified asphalt constant temperature storage anti-caking device according to claim 1, characterized in that, The heat-conducting plate (4) is evenly distributed along the inner wall of the storage tank (1). The heat-conducting plate (4) is fixed to the inner wall of the storage tank (1) by bolts. The surface of the heat-conducting plate (4) is processed with transverse corrugated grooves.

3. The modified asphalt constant temperature storage anti-caking device according to claim 1, characterized in that, The space between the heat insulation shell (5) and the outer wall of the storage tank (1) is filled with heat insulation material. Multiple heat dissipation holes (6) are provided on the outside of the heat insulation shell (5), and each heat dissipation hole (6) is equipped with an adjustable baffle (7).

4. The modified asphalt constant temperature storage anti-caking device according to claim 1, characterized in that, The inner wall of the annular heating chamber (8) is tightly fitted to the outer wall of the bottom of the storage tank (1), and the two are connected by welding. The bottom of the annular heating chamber (8) is provided with a heat transfer oil inlet (10) and a heat transfer oil outlet (11), which are respectively connected to an external heat transfer oil circulation system.

5. The modified asphalt constant temperature storage anti-caking device according to claim 1, characterized in that, The drive motor (12) is fixedly installed on the bracket on the top of the storage tank (1). The bracket is fixedly connected to the top of the storage tank (1) by bolts. The output shaft of the drive motor (12) and the central shaft (2) are synchronously rotated through a coupling. The coupling has keyways at both ends, and flat keys are installed in the keyways.

6. The modified asphalt constant temperature storage anti-caking device according to claim 1, characterized in that, The feed inlet (13) is connected to an external conveying pipeline via a flange, and a filter screen (14) is provided inside the feed inlet (13).

7. The modified asphalt constant temperature storage anti-caking device according to claim 1, characterized in that, The discharge port (15) is connected to an external conveying pipeline through a valve (16). The valve (16) adopts a ball valve structure. The valve core and valve body of the ball valve are sealed by a sealing ring. The sealing ring is made of high-temperature resistant rubber.

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