Microwave hot air coupling heating device

Abstract

The utility model discloses a microwave hot air coupling heating device. The microwave hot air coupling heating device comprises a box body, a conveying mechanism, a microwave heating mechanism and a hot air heating mechanism, the box body is provided with a feeding hole and a discharging hole; the conveying mechanism is installed in the box body and is configured to convey materials entering the box body from the feeding port to the discharging port to be discharged. The microwave heating mechanism is communicated with the box body and is used for emitting microwaves into the box body; the hot air heating mechanism communicates with the box body and is used for conveying hot air into the box body. According to the microwave hot air coupling heating device, the inside and the outside of the asphalt reclaimed material are simultaneously heated and dehumidified, so that the heating quality of the asphalt reclaimed material is ensured, the mass heat transfer efficiency in the asphalt reclaimed material is improved, and the problems of edge overheating effect and thermal runaway are avoided.

Description

Technical Field

[0001] This application relates to the field of asphalt heating technology, and in particular to a microwave hot air coupled heating device. Background Technology

[0002] Plant-mixed hot recycling technology involves excavating old asphalt pavement and transporting it back to a mixing plant for centralized crushing and screening. Then, based on indicators such as asphalt content, asphalt aging degree, and aggregate gradation in the old material, a certain amount of new aggregate, new asphalt, and recycling agent are added and remixed in proportion to form a new mixture.

[0003] In traditional plant-mixed hot recycling processes, aggregate superheating is typically used to heat the recycled material. However, this method often limits the proportion of recycled material in the mix to below 30%, resulting in a significant waste of recyclable resources. In contrast, microwave heating technology offers unique advantages: it uses a non-contact, internal heating method to directly heat the recycled asphalt to the required construction temperature. However, microwave heating technology still faces significant challenges. The main issue is that heating the recycled asphalt to the required temperature both internally and externally requires high-energy microwaves. Heating the asphalt mixture with high-energy microwaves can lead to uneven microwave field distribution, causing edge overheating and thermal runaway problems. Utility Model Content

[0004] This application provides a microwave hot air coupling heating device, which solves the problem of edge overheating and thermal runaway caused by uneven microwave field distribution when heating asphalt mixtures with high-power microwaves in existing microwave heating technologies.

[0005] The microwave hot air coupling heating device provided in this application includes: a housing having an inlet and an outlet; a conveying mechanism installed inside the housing and configured to convey materials entering the housing from the inlet to the outlet; a microwave heating mechanism connected to the housing for emitting microwaves into the housing; and a hot air heating mechanism connected to the housing for delivering hot air into the housing.

[0006] In one possible implementation, the housing includes a first heating chamber, an insulation chamber, and a second heating chamber; the insulation chamber is connected to the first heating chamber and the second heating chamber, the first heating chamber is provided with the feed inlet, and the second heating chamber is provided with the discharge outlet; the conveying mechanism is located at the first heating chamber, the insulation chamber, and the second heating chamber; the microwave heating mechanism is connected to the first heating chamber and the second heating chamber; both hot air heating mechanisms are connected to the first heating chamber and the second heating chamber, and the hot air temperature entering the second heating chamber is higher than the hot air temperature entering the first heating chamber.

[0007] In one possible implementation, the conveying mechanism includes a motor, a drive sprocket, a chain, a driven sprocket, and a chain plate; both the drive sprocket and the driven sprocket are rotatably connected to the inner wall of the housing, and the drive sprocket is mounted on the motor shaft; the chain is wound around the drive sprocket and the driven sprocket, and the chain plate is connected to the chain.

[0008] In one possible implementation, the microwave heating mechanism includes a microwave power supply, a waveguide, and multiple pyramidal horn antennas; one end of the waveguide is connected to the microwave power supply; the multiple pyramidal horn antennas are connected to the waveguide and communicate with the housing for transmitting microwaves into the interior of the housing.

[0009] In one possible implementation, the hot air heating mechanism includes an air inlet duct, a blower, a combustion chamber, a fan, and an air outlet duct; one end of the air inlet duct is connected to the outlet of the blower, and the other end of the air inlet duct is connected to the housing; one end of the air outlet duct is connected to the inlet of the fan, and the other end of the air outlet duct is connected to the housing; both ends of the combustion chamber are respectively connected to the outlet of the fan and the inlet of the blower.

[0010] In one possible implementation, it further includes: a left-right rotating spiral feeder, which is installed inside the housing and near the feed inlet, for pushing the material to move axially along the left-right rotating spiral feeder.

[0011] In one possible implementation, it further includes an anti-sticking mechanism connected to the housing and located below the conveying mechanism, configured to apply a release agent to the conveying mechanism.

[0012] In one possible implementation, the anti-sticking mechanism includes a storage tank, a roller, and a support; the storage tank is connected to the inner wall of the tank body and opens toward the conveying mechanism for containing a release agent; the support is connected to the inner wall of the tank body, the roller is rotatably connected to the support, and the roller portion is located in the storage tank, the roller abutting against the conveying mechanism.

[0013] In one possible implementation, the support is rotatably connected to the inner wall of the housing; the anti-stick mechanism further includes a telescopic member, the two ends of which are respectively connected to the inner wall of the housing and the support, and are configured to drive the support to rotate to adjust the immersion depth of the roller in the storage tank.

[0014] In one possible implementation, the anti-sticking mechanism further includes a scraper and a scraper box connected to the inner wall of the housing; the scraper box opens toward the conveying mechanism, and the scraper is located above the scraper box and abuts against the conveying mechanism.

[0015] The technical solutions provided in this application embodiment have at least the following technical effects:

[0016] This application provides a microwave-hot-air coupled heating device, which includes a housing, a conveying mechanism, a microwave heating mechanism, and a hot-air heating mechanism. Asphalt recycled material, after crushing and screening, enters the housing through the inlet. The conveying mechanism transports the recycled asphalt from the inlet to the outlet. The microwave heating mechanism sends microwaves into the housing, heating the recycled asphalt on the conveying mechanism. The hot-air heating mechanism delivers hot air into the housing, heating the recycled asphalt inside. This microwave-hot-air coupled heating device heats the recycled asphalt during the conveying process, employing both microwave and hot-air heating methods. This allows for simultaneous heating and dehumidification of the recycled asphalt, ensuring heating quality and improving the internal mass and heat transfer efficiency. Furthermore, the microwave heating mechanism only needs to emit low-energy microwaves to bring the recycled asphalt to the required construction temperature, thus avoiding edge overheating and thermal runaway problems. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1A and Figure 1BThis is a schematic diagram of the structure of the microwave hot air coupling heating device provided in the embodiments of this application;

[0019] Figure 2 This is a schematic diagram of the structure of the microwave heating mechanism provided in the embodiments of this application;

[0020] Figure 3 This is a schematic diagram of the structure of the hot air heating mechanism provided in the embodiments of this application;

[0021] Figure 4 This is a schematic diagram of the conveying mechanism provided in the embodiments of this application;

[0022] Figure 5 The conveying mechanism and the left-right rotating spiral feeder provided in the embodiments of this application;

[0023] Figure 6 This is a schematic diagram of the anti-sticking mechanism provided in an embodiment of this application.

[0024] Reference numerals: 100-Box body; 110-First heating box; 120-Insulation box; 130-Second heating box; 131-Discharge port; 200-Conveying mechanism; 210-Motor; 220-Drive sprocket; 230-Chain; 240-Driven sprocket; 250-Chain plate; 300-Microwave heating mechanism; 310-Microwave power supply; 320-Waveguide; 330-Pyramidal horn antenna; 400-Hot air heating mechanism; 410-Air inlet duct; 420-Blower; 430-Combustion chamber; 440-Fan; 450-Air outlet duct; 500-Left and right rotating spiral material distributor; 600-Anti-sticking mechanism; 610-Storage box; 620-Roller; 630-Support; 640-Telescopic component; 650-Scraper; 660-Scraper box. Detailed Implementation

[0025] The technical solutions of 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, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of this application and for 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. Therefore, they should not be construed as limitations on this application. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0027] This application provides a microwave hot air coupling heating device, such as... Figure 1A and Figure 1B As shown, the microwave hot air coupling heating device includes a housing 100, a conveying mechanism 200, a microwave heating mechanism 300, and a hot air heating mechanism 400.

[0028] The container 100 is provided with an inlet and an outlet 131. The recycled asphalt material enters the container 100 through the inlet and is heated in the container 100 before being discharged from the container 100 through the outlet 131.

[0029] The conveying mechanism 200 is installed inside the housing 100 and is configured to convey materials entering the housing 100 from the inlet to the outlet 131 for discharge. When the recycled asphalt material enters the housing 100 from the inlet, the conveying mechanism 200 carries the recycled asphalt material from the inlet to the outlet 131, so that the asphalt is heated during the journey.

[0030] A microwave heating mechanism 300 is connected to the housing 100 and is used to emit microwaves into the interior of the housing 100. A hot air heating mechanism 400 is connected to the housing 100 and is used to supply hot air into the interior of the housing 100. Microwaves and hot air simultaneously heat the asphalt recycling material inside the housing 100, ensuring that the asphalt recycling material is heated and dehumidified both internally and externally, thus guaranteeing the heating quality of the asphalt recycling material and improving the internal mass and heat transfer efficiency. Furthermore, the microwave heating mechanism 300 only needs to emit low-energy microwaves to bring the asphalt recycling material to the required construction temperature, thereby avoiding edge overheating effects and thermal runaway problems.

[0031] like Figure 1A and Figure 1BAs shown in this embodiment, the housing 100 includes a first heating box 110, a heat preservation box 120, and a second heating box 130. The heat preservation box 120 is connected to the first heating box 110 and the second heating box 130. The first heating box 110 is provided with a feed inlet, and the second heating box 130 is provided with a discharge outlet 131. A conveying mechanism 200 is located in the first heating box 110, the heat preservation box 120, and the second heating box 130. A microwave heating mechanism 300 is connected to the first heating box 110 and the second heating box 130. Both the first heating box 110 and the second heating box 130 are connected to a hot air heating mechanism 400, and the temperature of the hot air entering the second heating box 130 is higher than the temperature of the hot air entering the first heating box 110.

[0032] Asphalt recycling material with an initial temperature (e.g., 20°C) enters the first heating box 110 through the inlet. A microwave heating device and a hot air heating device simultaneously heat the asphalt recycling material at a low temperature. When heated to approximately a first preset temperature (e.g., 100°C), the conveying mechanism 200 transports the asphalt recycling material to the insulation box 120. After entering the second heating box 130 from the insulation box 120, the microwave heating device and the hot air heating device heat the asphalt recycling material at a high temperature. When the asphalt recycling material is heated to the second preset temperature required for construction (e.g., 140°C to 160°C), it is discharged from the second heating box 130 through the outlet 131 via the conveying mechanism 200.

[0033] Furthermore, the box 100 also includes an insulation layer covering the outside of the insulation box 120, which promotes a more uniform internal temperature distribution of the asphalt recycled material and prepares it for the subsequent high-temperature heating process of the asphalt recycled material in the second heating box 130.

[0034] In some other embodiments of this application, the housing 100 may also be a single unit.

[0035] like Figure 4 As shown in this embodiment, the conveying mechanism 200 includes a motor 210, a drive sprocket 220, a chain 230, a driven sprocket 240, and a chain plate 250. Both the drive sprocket 220 and the driven sprocket 240 are rotatably connected to the inner wall of the housing 100, and the drive sprocket 220 is mounted on the shaft of the motor 210. The chain 230 is wound around the drive sprocket 220 and the driven sprocket 240, and the chain plate 250 is connected to the chain 230.

[0036] The asphalt recycling material entering the box 100 from the feed inlet falls onto the chain plate 250. The rotating shaft of the motor 210 drives the drive sprocket 220, and the chain 230 rotates on the drive sprocket 220 and the driven sprocket 240, thereby driving the chain plate 250 to move. The asphalt recycling material moves with the chain plate 250 from the feed inlet to the discharge outlet 131.

[0037] In some other embodiments of this application, the conveying mechanism 200 may also be a high-temperature resistant belt conveyor.

[0038] like Figure 2 As shown in this embodiment, the microwave heating mechanism 300 includes a microwave power supply 310, a waveguide 320, and multiple pyramidal horn antennas 330. One end of the waveguide 320 is connected to the microwave power supply 310. The multiple pyramidal horn antennas 330 are connected to the waveguide 320 and communicate with the housing 100 for transmitting microwaves into the interior of the housing 100.

[0039] When the microwave heating mechanism 300 is working, the microwave power supply 310 generates microwaves, which propagate along the waveguide 320 and are transmitted into the box 100 through multiple pyramidal horn antennas 330 to microwave heat the asphalt recycling material inside the box 100.

[0040] like Figure 3 As shown in this embodiment, the hot air heating mechanism 400 includes an air inlet duct 410, a blower 440 / 420, a combustion chamber 430, a fan 440, and an air outlet duct 450. One end of the air inlet duct 410 is connected to the outlet of the blower 440 / 420, and the other end of the air inlet duct 410 is connected to the housing 100. One end of the air outlet duct 450 is connected to the inlet of the fan 440, and the other end of the air outlet duct 450 is connected to the housing 100; both ends of the combustion chamber 430 are respectively connected to the outlet of the fan 440 and the inlet of the blower 440 / 420.

[0041] When the hot air heating mechanism 400 is working, the blower 440 draws air out of the box 100 through the air outlet duct 450 and delivers it to the combustion chamber 430. The combustion chamber 430 heats the air to form hot air. The blower 440 420 delivers the hot air in the combustion chamber 430 to the box 100 through the air inlet duct 410, and then the hot air heats the asphalt recycling material in the box 100.

[0042] The aforementioned hot air heating mechanism 400 heats and recycles the air inside the housing 100, reducing heat loss and lowering energy consumption.

[0043] In some other embodiments of this application, the hot air heating mechanism 400 can be a hot air blower 440, the outlet of the hot air blower 440 is connected to the housing 100, and the inlet of the hot air blower 440 is connected to the outside atmosphere.

[0044] like Figure 5 As shown, the microwave hot air coupling heating device also includes a left-right rotating spiral feeder 500, which is installed inside the housing 100 and close to the feed inlet, for pushing the material to move along the axial direction of the left-right rotating spiral feeder 500.

[0045] When the asphalt mixture enters the housing 100 from the inlet, it comes into contact with the left-right rotating spiral distributor 500, causing the distributor 500 to rotate. The rotating distributor 500 can push the asphalt mixture to move along the axial direction of the distributor 500, so that the asphalt mixture can be evenly distributed on the conveying mechanism 200. In turn, the microwave heating mechanism 300 and the hot air heating mechanism 400 can heat the asphalt mixture more evenly.

[0046] like Figure 5 As shown, the microwave hot air coupling heating device also includes an anti-sticking mechanism 600, which is connected to the housing 100 and located below the conveying mechanism 200, and is configured to apply a release agent to the conveying mechanism 200.

[0047] The recycled asphalt material becomes highly adhesive after being heated, and easily sticks to the conveying mechanism 200. Applying a release agent to the conveying mechanism 200 by the anti-sticking mechanism 600 prevents the recycled asphalt material from sticking to the conveying mechanism 200.

[0048] like Figure 6 As shown in the embodiment of this application, the anti-sticking mechanism 600 includes a storage tank 610, a roller 620, and a support 630. The storage tank 610 is connected to the inner wall of the housing 100 and opens towards the conveying mechanism 200 for containing the release agent; the support 630 is connected to the inner wall of the housing 100, the roller 620 is rotatably connected to the support 630, and the roller 620 is partially located in the storage tank 610, with the roller 620 abutting against the conveying mechanism 200.

[0049] Since the roller 620 abuts against the conveying mechanism 200, when the conveying mechanism 200 is working, the roller 620 rotates on the support 630, thereby coating the release agent stored in the storage box 610 onto the surface of the conveying mechanism 200.

[0050] Furthermore, the support 630 is rotatably connected to the inner wall of the housing 100. The anti-stick mechanism 600 also includes a telescopic member 640, the two ends of which are connected to the inner wall of the housing 100 and the support 630, respectively, and is configured to drive the support 630 to rotate to adjust the immersion depth of the roller 620 in the storage tank 610.

[0051] As the anti-sticking mechanism 600 operates, the release agent in the storage tank 610 gradually decreases. The telescopic component 640 can extend and retract to drive the support 630, so that the roller 620 connected to the support 630 can always be partially immersed in the release agent, ensuring that the roller 620 can coat the release agent onto the conveying mechanism 200 during rotation.

[0052] Continue to refer to Figure 6The anti-sticking mechanism 600 also includes a scraper 650 and a scraper box 660 connected to the inner wall of the housing 100. The scraper box 660 opens toward the conveying mechanism 200, and the scraper 650 is located above the scraper box 660 and abuts against the conveying mechanism 200.

[0053] Even though the anti-sticking mechanism 600 applies a release agent to the surface of the conveying mechanism 200, a small amount of recycled asphalt may still remain on the conveying mechanism 200. The scraper 650 can scrape off the small amount of recycled asphalt remaining on the surface of the conveying mechanism 200, and the scraper box 660 can receive the scraped recycled asphalt.

[0054] In other embodiments of this application, the anti-sticking mechanism 600 includes a storage tank 610 connected to the inner wall of the housing 100 for containing a release agent; the storage tank 610 has slots on two opposite sides for the conveying mechanism 200 to pass through; the conveying mechanism 200 is... Figure 4 In this configuration, the chain plate 250 passes through the slot of the storage box 610, and the surface of the chain plate 250 is immersed in the release agent.

[0055] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0056] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A microwave hot air coupling heating device, characterized in that, include: The housing is provided with an inlet and an outlet; A conveying mechanism, installed inside the housing, is configured to convey materials entering the housing from the inlet to the outlet for discharge. A microwave heating mechanism, connected to the housing, for emitting microwaves into the interior of the housing; and A hot air heating mechanism is connected to the housing and is used to deliver hot air into the interior of the housing.

2. The microwave hot air coupling heating device according to claim 1, characterized in that, The enclosure includes a first heating chamber, an insulation chamber, and a second heating chamber; The heat preservation box is connected to the first heating box and the second heating box. The first heating box is provided with the feed inlet, and the second heating box is provided with the discharge outlet. The conveying mechanism is located in the first heating box, the heat preservation box, and the second heating box; The microwave heating mechanism is connected to the first heating box and the second heating box; both the first heating box and the second heating box are connected to the hot air heating mechanism, and the hot air temperature entering the second heating box is higher than the hot air temperature entering the first heating box.

3. The microwave hot air coupling heating device according to claim 1, characterized in that, The conveying mechanism includes a motor, a drive sprocket, a chain, a driven sprocket, and a chain plate; Both the driving sprocket and the driven sprocket are rotatably connected to the inner wall of the housing, and the driving sprocket is mounted on the motor shaft; The chain is wound around the driving sprocket and the driven sprocket, and the chain plate is connected to the chain.

4. The microwave hot air coupling heating device according to claim 1, characterized in that, The microwave heating mechanism includes a microwave power supply, a waveguide, and multiple pyramidal horn antennas. One end of the waveguide is connected to the microwave power supply; The plurality of pyramidal horn antennas are connected to the waveguide and communicate with the enclosure, for transmitting microwaves into the interior of the enclosure.

5. The microwave hot air coupling heating device according to claim 1, characterized in that, The hot air heating mechanism includes an air inlet duct, a blower, a combustion chamber, a fan, and an air outlet duct; One end of the air inlet duct is connected to the outlet of the blower, and the other end of the air inlet duct is connected to the housing; One end of the air outlet duct is connected to the inlet of the fan, and the other end of the air outlet duct is connected to the housing; The two ends of the combustion chamber are respectively connected to the outlet of the blower and the inlet of the blower.

6. The microwave hot air coupling heating device according to claim 1, characterized in that, Also includes: A left-right rotating spiral feeder is installed inside the housing and near the feed inlet to push the material along the axial direction of the left-right rotating spiral feeder.

7. The microwave hot air coupling heating device according to claim 1, characterized in that, Also includes: An anti-sticking mechanism, connected to the housing and located below the conveying mechanism, is configured to apply a release agent to the conveying mechanism.

8. The microwave hot air coupling heating device according to claim 7, characterized in that, The anti-sticking mechanism includes a storage box, rollers, and a support. The storage tank is connected to the inner wall of the tank body and opens towards the conveying mechanism to contain the release agent; The bracket is connected to the inner wall of the box, the roller is rotatably connected to the bracket, and the roller portion is located in the storage box, the roller abutting against the conveying mechanism.

9. The microwave hot air coupling heating device according to claim 8, characterized in that, The bracket is rotatably connected to the inner wall of the housing; The anti-sticking mechanism also includes a telescopic component, the two ends of which are respectively connected to the inner wall of the box and the support, and are configured to drive the support to rotate to adjust the immersion depth of the roller in the storage box.

10. The microwave hot air coupling heating device according to claim 9, characterized in that, The anti-sticking mechanism also includes a scraper and a scraper box connected to the inner wall of the box body; The scraper box opens toward the conveying mechanism, and the scraper plate is located above the scraper box and abuts against the conveying mechanism.

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