A cast asphalt heating and mixing device
By combining the heat transfer oil coil and heating element with the mixing assembly, the problem of uneven heating of asphalt concrete was solved, achieving uniform heating, avoiding equipment blockage and construction quality issues, and ensuring the normal operation of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN YIGAO ROAD ENGINEERING CO LTD
- Filing Date
- 2025-09-11
- Publication Date
- 2026-07-31
AI Technical Summary
Existing asphalt concrete heating equipment suffers from uneven heating, leading to fluidity stratification of the same batch of asphalt concrete, and even causing equipment blockage, affecting construction quality and equipment use.
The design incorporates a heat transfer oil coil and a heating element combined with a mixing assembly. The heat transfer oil coil heats the outer side of the asphalt concrete, while the inner heating element heats the inner side of the asphalt concrete. The mixing assembly ensures uniform heating, and the auxiliary material is preheated through the auxiliary material pipe to reduce the formation of localized low-temperature zones.
It achieves uniform heating of asphalt concrete, avoids flow separation and equipment blockage, and ensures normal equipment use and construction quality.
Smart Images
Figure CN224578583U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of asphalt mixing equipment, and more specifically, it relates to a casting-type asphalt heating and mixing equipment. Background Technology
[0002] Cast-in-place asphalt is a thermoplastic asphalt mixture composed of hard asphalt, mineral powder, and continuously graded aggregate. During high-temperature (220–250℃) construction, it exhibits a near-fluid state, achieving self-leveling and self-compacting under its own weight. After cooling, it forms a dense, waterproof structural layer with a porosity of ≤3%, achieving the required engineering strength without any compaction machinery. Cast-in-place asphalt is primarily used for steel bridge deck paving, commonly serving as a waterproof bonding layer or subbase layer in paving systems. Its deformation compliance, waterproofing, and integrity perfectly solve the problems of easy deformation and corrosion of steel bridge decks.
[0003] During the construction of cast-in-place asphalt concrete pavements, the materials need to be heated in the mixing tank to ensure the mixing quality of the mixture. However, existing asphalt concrete heating equipment suffers from uneven heating, which can lead to fluid stratification of the same batch of asphalt concrete. This can cause the asphalt concrete to solidify at the equipment outlet, or even cause equipment blockage, affecting the normal use of the equipment and impacting the density of the pavement layer and the waterproofing performance of the bridge deck.
[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a casting-type asphalt heating and mixing equipment in order to achieve a more practical purpose. Utility Model Content
[0005] In view of the problems mentioned in the background art, the present invention provides a casting-type asphalt heating and mixing equipment, which can ensure uniform heating of asphalt concrete heating equipment.
[0006] The technical solution adopted by this utility model is as follows: A cast-in-place asphalt heating and mixing device includes a first tank and a second tank disposed inside the first tank. A gap is left between the first tank and the second tank. The first tank has a first feed pipe and a discharge pipe that communicate with the interior of the second tank. A heat-conducting oil coil is wrapped around the outside of the second tank. The first tank has an oil inlet pipe and an oil outlet pipe that communicate with the heat-conducting oil coil. A mixing component and a drive mechanism for driving the mixing component to move are disposed inside the second tank. A heating element is disposed in the middle of the second tank.
[0007] The technical principle of this utility model is as follows: the heat transfer oil coil can heat the outer wall of the second tank, which can heat the outer side of the asphalt concrete inside the second tank. At the same time, the heating element can heat the inner side of the asphalt concrete. Then, the stirring component can stir the asphalt concrete, thereby making the asphalt concrete heating equipment heat evenly.
[0008] Furthermore, an auxiliary material pipe connected to the first feed pipe is provided in the gap, and a second feed pipe connected to the auxiliary material pipe is provided on the first tank body.
[0009] Furthermore, the stirring assembly includes stirring rods and connectors. The number of stirring rods is greater than one. One end of the stirring rod is mounted on the drive mechanism, and the connector is mounted on the other end of the stirring rod. The connector is rotatably mounted at the bottom of the second tank.
[0010] Furthermore, a reinforcing member is provided in the middle of the stirring rod.
[0011] Furthermore, the drive mechanism includes a drive component and a transmission assembly fixedly mounted on the first tank body. The power output shaft of the drive component passes through both the first and second tank bodies and is disposed within the second tank body. The transmission assembly includes a fixed plate fixedly mounted on the top of the second tank body, a first gear and a second gear rotatably connected to the fixed plate, the first gear and the second gear meshing with each other. The power output shaft of the drive component passes through the fixed plate. The first gear is coaxially fixedly mounted on the power output shaft of the drive component. The stirring assembly is fixedly mounted on the second gear.
[0012] The beneficial effects of this utility model are:
[0013] 1. By setting up heat transfer oil coils and heating elements, the asphalt concrete can be heated both inside and out simultaneously. Then, the asphalt concrete is stirred by the mixing components, which can ensure that the heating equipment for asphalt concrete is heated evenly.
[0014] 2. By setting up the auxiliary material pipe, the auxiliary material enters the auxiliary material pipe through the second feed pipe. The waste heat generated by the heat transfer oil coil in the gap can preheat the auxiliary material. The preheated auxiliary material is then passed into the second pipe body, which can reduce the local low temperature zone formed when the auxiliary material comes into contact with the hot asphalt, thereby reducing the difference in fluidity of the same batch of mixture. Attached Figure Description
[0015] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;
[0016] Figure 1 This is a schematic diagram of the structure of this utility model;
[0017] Figure 2 This is a cross-sectional schematic diagram of the present invention;
[0018] The attached diagram is labeled as follows:
[0019] 1. First tank body; 2. Second tank body; 3. First feed pipe; 4. Discharge pipe; 5. Heat transfer oil coil; 6. Oil inlet pipe; 7. Oil outlet pipe; 8. Heating element; 9. Auxiliary material pipe; 10. Second feed pipe;
[0020] 11. Stirring assembly; 1101. Stirring rod; 1102. Connecting parts; 1103. Reinforcing parts;
[0021] 12. Driving components;
[0022] 13. Transmission assembly; 1301. Fixing plate; 1302. First gear; 1303. Second gear;
[0023] 14. Cover; 15. Supporting legs. Detailed Implementation
[0024] like Figures 1-2 As shown, a castable asphalt heating and mixing device includes a first tank 1 and a second tank 2 disposed inside the first tank 1. A gap is left between the first tank 1 and the second tank 2. The first tank 1 has a first feed pipe 3 and a discharge pipe 4 that communicate with the interior of the second tank 2. A heat transfer oil coil 5 is wrapped around the outside of the second tank 2. The first tank 1 is provided with an oil inlet pipe 6 and an oil outlet pipe 7 that communicate with the heat transfer oil coil 5. A mixing component 11 and a drive mechanism for driving the mixing component 11 are disposed inside the second tank 2. A heating element 8 is disposed in the middle of the second tank 2.
[0025] The heat transfer oil coil 5 is spirally wound around the outer wall of the second tank 2. Compared with the straight pipe layout, the spiral winding structure can extend the length of the oil pipe, thereby increasing the heat exchange area. Furthermore, the heat transfer oil flowing inside the spiral tube can generate secondary eddies, further improving the heat exchange efficiency for materials in the edge area. Simultaneously, the heat transfer oil coil 5 can also be spirally wound in a wavy pattern, superimposed with longitudinal undulations. The wavy structure causes the heat transfer oil to pulsate in flow direction, shortening the temperature equalization time. The heat transfer oil coil 5 can heat the outer wall of the second tank 2, while the heating element 8 can heat the inner side of the asphalt concrete. The stirring assembly 11 can then stir the asphalt concrete, ensuring uniform heating of the asphalt concrete, eliminating localized low-temperature zones, and preventing flow separation of the same batch of asphalt concrete. This avoids the asphalt concrete solidifying at the equipment outlet or even causing equipment blockage, ensuring the normal operation of the equipment.
[0026] Both the first feed pipe 3 and the discharge pipe 4 pass through a gap. The high temperature within the gap preheats the asphalt concrete in the first feed pipe 3, shortening the heating time of the asphalt concrete. The mixed asphalt concrete is discharged through the discharge pipe 4. The high temperature within the gap insulates the asphalt concrete in the discharge pipe 4, eliminating localized low-temperature zones. This further prevents stratification of the same batch of asphalt concrete, avoiding solidification at the equipment outlet or even equipment blockage, ensuring normal equipment operation. A cover 14 is provided on the first feed pipe 3 to reduce heat loss from the second tank 2. Support legs 15 are provided at the bottom of the first tank 1 to facilitate discharge from the discharge pipe 4.
[0027] Furthermore, such as Figure 2 As shown, an auxiliary material pipe 9 connected to the first feed pipe 3 is provided in the gap, and a second feed pipe 10 connected to the auxiliary material pipe 9 is provided on the first tank body 1.
[0028] As a key auxiliary material, when room-temperature mineral powder is directly injected into the high-temperature mixing tank, it instantly forms a localized low-temperature zone upon contact with hot asphalt. The temperature in this zone drops sharply. Due to the extremely low thermal conductivity and high specific heat capacity of the mineral powder, and because the temperature recovery in this low-temperature zone depends entirely on heat conduction, the viscosity of the asphalt in the low-temperature zone increases dramatically, failing to fully wet the surface of the mineral powder. This results in the formation of uncoated "white spot" agglomerates. These agglomerates block the heat transfer path and form stress concentration points, leading to differences in flowability, substandard core sample density, and substandard local void sizes in the same batch of mixture. The auxiliary material pipe 9 is wound within the gap. Room-temperature mineral powder enters the auxiliary material pipe 9 through the second feed pipe 10. The waste heat generated by the heat-conducting oil coil 5 within the gap preheats the auxiliary material. The preheating time is positively correlated with the winding length of the auxiliary material pipe 9 within the gap. The preheated auxiliary material is then introduced into the second pipe, reducing the formation of agglomerates and thus minimizing differences in flowability within the same batch of mixture.
[0029] Meanwhile, both preheating and heating are set within the gap, which can improve space utilization and reduce the overall size of the equipment.
[0030] Furthermore, such as Figure 2 As shown, the stirring assembly 11 includes a stirring rod 1101 and a connector 1102. The number of stirring rods 1101 is greater than 1. One end of the stirring rod 1101 is disposed on the driving mechanism, and the connector 1102 is disposed on the other end of the stirring rod 1101. The connector 1102 is rotatably disposed at the bottom of the second tank 2.
[0031] The number of stirring rods 1101 can be 2, 3, or 4, etc. To improve the mixing effect and the stability between the stirring rods 1101, a set of stirring components 11 here has three stirring rods 1101. All three stirring rods 1101 are fixedly installed on the connecting member 1102. Under the action of the driving component, the stirring component 11 rotates, stirring the asphalt concrete in the second tank 2, thereby ensuring uniform heating of the asphalt concrete heating equipment. The setting of the limiting member ensures the stability of the stirring component 11 during operation. To improve the mixing effect, three sets of stirring components 11 are preferred.
[0032] Furthermore, such as Figure 2 As shown, a reinforcing member 1103 is provided in the middle of the stirring rod 1101.
[0033] The reinforcing member 1103 is a triangular rib plate, which is inserted between the three stirring rods 1101. The reinforcing member 1103 can improve the working life of the stirring rods 1101.
[0034] Furthermore, such as Figure 2 As shown, the drive mechanism includes a drive component 12 and a transmission assembly 13 fixedly mounted on the first tank 1. The power output shaft of the drive component 12 passes through both the first tank 1 and the second tank 2 and is disposed inside the second tank 2. The transmission assembly 13 includes a fixed plate 1301 fixedly mounted on the top of the second tank 2, and a first gear 1302 and a second gear 1303 rotatably connected to the fixed plate 1301. The first gear 1302 and the second gear 1303 mesh with each other. The power output shaft of the drive component 12 passes through the fixed plate 1301. The first gear 1302 is coaxially fixedly mounted on the power output shaft of the drive component 12. The stirring assembly 11 is fixedly mounted on the second gear 1303.
[0035] The drive unit 12 is a variable frequency motor. When it rotates, it drives the first gear 1302 to rotate synchronously. When the first gear 1302 rotates, it drives the second gear 1303 to rotate synchronously, which in turn drives the stirring assembly 11 to rotate. The number of transmission components 13 is the same as the number of stirring components 11.
[0036] The present invention has been described in detail above. The specific embodiments are provided only to help understand the method and core idea of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.
Claims
1. A cast-in-place asphalt heating and mixing equipment, characterized in that: The first tank (1) and the second tank (2) are arranged inside the first tank (1). There is a gap between the first tank (1) and the second tank (2). The first tank (1) has a first feed pipe (3) and a discharge pipe (4) that communicate with the inside of the second tank (2). The second tank (2) is surrounded by a heat transfer oil coil (5). The first tank (1) is provided with an oil inlet pipe (6) and an oil outlet pipe (7) that communicate with the heat transfer oil coil (5). The second tank (2) is provided with a stirring assembly (11) and a drive mechanism for driving the stirring assembly (11) to move. The second tank (2) is provided with a heating element (8) in the middle.
2. The asphalt heating and mixing equipment for casting as described in claim 1, characterized in that: An auxiliary material pipe (9) connected to the first feed pipe (3) is provided in the gap, and a second feed pipe (10) connected to the auxiliary material pipe (9) is provided on the first tank body (1).
3. The asphalt heating and mixing equipment for casting as described in claim 2, characterized in that: The stirring assembly (11) includes a stirring rod (1101) and a connector (1102). The number of stirring rods (1101) is greater than 1. One end of the stirring rod (1101) is set on the driving mechanism, and the connector (1102) is set on the other end of the stirring rod (1101). The connector (1102) is rotatably set at the bottom of the second tank (2).
4. The asphalt heating and mixing equipment for casting as described in claim 3, characterized in that: A reinforcing member (1103) is provided in the middle of the stirring rod (1101).
5. A cast-in-place asphalt heating and mixing equipment according to claim 3 or 4, characterized in that: The drive mechanism includes a drive component (12) and a transmission assembly (13) fixedly mounted on the first tank (1). The power output shaft of the drive component (12) passes through both the first tank (1) and the second tank (2) and is located inside the second tank (2). The transmission assembly (13) includes a fixed plate (1301) fixedly mounted on the top of the second tank (2), a first gear (1302) and a second gear (1303) rotatably connected to the fixed plate (1301). The first gear (1302) and the second gear (1303) mesh with each other. The power output shaft of the drive component (12) passes through the fixed plate (1301). The first gear (1302) is coaxially fixedly mounted on the power output shaft of the drive component (12). The stirring assembly (11) is fixedly mounted on the second gear (1303).