Road milling asphalt waste recycling device

Abstract

The invention provides a road milling asphalt waste recycling device, which belongs to the field of solid waste recycling, and comprises a heating unit, a separation unit, a protection unit and a feeding unit, the heating unit comprises a heating tank and a heating assembly used for heating the heating tank. The separation unit comprises a separation layer and a switch part which are arranged in the heating tank, the separation layer divides the heating tank into a top area and a bottom area which are arranged up and down, a gas passing channel communicating the top area with the bottom area is formed in the separation layer, and the switch part is arranged at an inlet of the gas passing channel and used for opening or closing the gas passing channel; the protection unit comprises a protection tank used for containing inert gas, a gas outlet pipeline communicating with the protection tank and the top area, and a gas inlet pipeline communicating with the protection tank and the bottom area. The feeding unit is connected to the heating tank and used for conveying asphalt waste into the heating tank. The operation cost of the equipment is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of solid waste recycling, and in particular relates to a device for recycling road milling asphalt waste. Background Art

[0002] With the increasing number of urban road maintenance and renovation and expansion projects, a large amount of waste asphalt pavement materials are removed through milling operations. From the perspective of resource conservation, environmental protection and reducing road construction costs, recycling and reusing asphalt waste has become a consensus and inevitable trend in the field of road engineering.

[0003] The recycling and reuse of asphalt waste requires heating treatment. However, when asphalt waste is exposed to air at high temperatures (usually over 160°C), the oxygen in the air will undergo extensive oxidation reactions with the asphalt binder. The direct consequence is that the light components of the asphalt evaporate faster and the molecular structure undergoes irreversible hardening and embrittlement, which seriously damages the final quality of the recycled asphalt mixture.

[0004] Currently, attempts are being made to alleviate this problem by introducing inert gas protection. However, when asphalt is heated, harmful gases such as VOCs are continuously produced. Once VOCs and inert gases are mixed, they cannot be separated, resulting in the continuous consumption of inert gases and increased operating costs. Summary of the Invention

[0005] An embodiment of the present invention provides a device for recycling and reusing waste asphalt from road milling, aiming to solve the technical problem of high operating costs.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is to provide a road milling asphalt waste recycling and reuse device, comprising: A heating unit, comprising a heating tank and a heating assembly for heating the heating tank; a separation unit comprising a separation layer and a switch member disposed within the heating tank, wherein the separation layer separates the heating tank into a top region and a bottom region disposed one above the other, wherein a gas passage connecting the top region and the bottom region is defined within the separation layer, and wherein the switch member is disposed at an entrance of the gas passage and is used to open or close the gas passage; a protection unit comprising a protection tank for containing an inert gas, an air outlet pipe communicating with the protection tank and the top region, and an air inlet pipe communicating with the protection tank and the bottom region; and The feeding unit is connected to the heating tank and is used to transport asphalt waste into the heating tank.

[0007] In a possible implementation, a feed port communicating with the bottom area is provided at the bottom of the heating tank, and a blocking unit is provided at the feed port, and the blocking unit is used to open and close the feed port; The feeding unit comprises: A pretreatment box is connected to the feed port, and the pretreatment box is provided with a discharge port connected to the feed port; A crushing assembly, provided at the discharge port, for crushing asphalt waste; a material transport rack, one end of which is disposed in the bottom area and the other end of which extends into the pretreatment box; a material transport box, slidably connected to the material transport frame, the material transport box moving along the extension direction of the material transport frame, the material transport box having a first working state of receiving asphalt waste and a second working state of releasing asphalt waste; and A reciprocating assembly, connected to the material transport box, for driving the material transport box to move back and forth; Among them, when the material transport box is in the first working state, the material transport box is located in the pretreatment box and aligned with the discharge port. After the material transport box moves into the heating tank, the material transport box changes from the first working state to the second working state.

[0008] In a possible implementation, the blocking unit includes: An upper sealing plate is slidably connected to the heating tank, the upper sealing plate moves in an up-down direction, and a lower groove matching the material transport rack is provided at the bottom of the upper sealing plate; A lower sealing plate is slidably connected to the heating tank, the lower sealing plate moves in the up and down directions, and an upper groove matching the material transport rack is formed on the top of the upper sealing plate; and The opening and closing assembly is connected to the upper sealing plate and the lower sealing plate, and is used to drive the upper sealing plate and the lower sealing plate to move closer to or away from each other.

[0009] In a possible implementation, the material transport box includes: Two oppositely arranged half-enclosure plates enclose a material discharge area, the half-enclosure plates are slidably connected to the material transport rack, and the half-enclosure plates move along the extension direction of the material transport rack; Two half-support plates are arranged opposite to each other, corresponding to the half-enclosing plates one by one, the half-support plates are slidably connected to the corresponding half-enclosing plates, and the moving direction of the half-support plates is perpendicular to the extending direction of the material transport rack; and A displacement assembly connected to the half-support plates, for driving the two half-support plates toward or away from each other; Among them, the two half-pallets close the bottom of the discharge area, and the material transport box is in the first working state at this time; the two half-pallets open the bottom of the discharge area, and the material transport box is in the second working state at this time.

[0010] In a possible implementation, the half-support plate is provided with a plurality of first material transfer openings, and the plurality of first material transfer openings are sequentially arranged along the moving direction of the half-support plate; The material transport box further includes a bottom plate, the bottom plate is fixedly connected to the two half-enclosure plates and blocks the material discharge area, and the bottom plate is penetrated by a plurality of second material passing openings, and the plurality of second material passing openings are sequentially arranged along the moving direction of the half-support plate; Among them, when the half-pallet moves so that the first feeding port and the second feeding port are not aligned, the material transport box is in the first working state; when the half-pallet moves so that the first feeding port and the second feeding port are aligned, the material transport box is in the second working state.

[0011] In a possible implementation, a plurality of material guide strips are fixedly connected to the upper surface of the bottom plate, the cross-section of the material guide strips is triangular, and the material guide strips and the second material passing ports are alternately arranged.

[0012] In one possible implementation, the feeding unit further includes a temporary storage box arranged in the pretreatment box, the temporary storage box having a temporary storage area extending from top to bottom, the temporary storage area being aligned with the discharge port, and a discharge piece for closing or opening the temporary storage area being installed at the bottom of the temporary storage box.

[0013] In a possible implementation, the temporary storage box is slidably connected to the pre-processing box, and the temporary storage box moves in a horizontal direction; The feeding unit further comprises: An extrusion member is rotatably connected to the inner wall of the pre-treatment box, and the rotation axis of the extrusion member is perpendicular to the moving direction of the temporary storage box; a power member, drivingly connected to the extrusion member, and configured to drive the extrusion member to rotate; and An elastic member is fixedly connected between the temporary storage box and the pre-processing box, and the elastic member has a pre-tightening force that causes the temporary storage box to move toward the extrusion member.

[0014] In a possible implementation, the protection unit further includes an exhaust member connected to the interior of the heating tank, and the exhaust member is used to extract air from the heating tank.

[0015] In a possible implementation, the protection unit further includes: A monitoring component is provided in the heating tank and is used to monitor the air pressure in the heating tank; an air intake check valve connected to the air intake pipe and in communication with the monitoring component; and The gas outlet one-way valve is connected to the gas outlet pipe and is in communication with the monitoring component.

[0016] Compared with the prior art, the road milling asphalt waste recycling and reuse device provided by the present invention is characterized by the injection of inert gas into the bottom area through a protective tank, forming an oxygen-free environment in the bottom area, thereby inhibiting the volatilization of light components of the asphalt and the oxidation embrittlement of the molecular chain. The inert gas in the bottom area rises, and at the same time, the volatile VOCs gas generated by the heating of the asphalt rises and mixes with the inert gas; when the mixed gas passes through the gas passage, the inert gas will not be adsorbed by the separation layer due to the lack of chemical interaction between the inert gas and the activated carbon, while the VOCs gas reacts chemically with the separation layer through van der Waals forces and forms stable chemical bonds. After the separation layer is in an adsorption saturation state, the VOCs can be desorbed and regenerated by reversely introducing hot nitrogen, thereby realizing VOCs resource recovery and in-situ regeneration of the separation layer. The present invention separates VOCs from the inert gas by setting a separation layer, and the purified inert gas is returned to the protective tank through the gas outlet pipe for recycling, thereby reducing the amount of inert gas replenished and reducing the operating cost of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a device for recycling and reusing waste asphalt from road milling according to an embodiment of the present invention; Figure 2 A partial cross-sectional view of a separation unit according to an embodiment of the present invention; Figure 3 This is a partial cross-sectional view of another modified implementation of the separation unit according to an embodiment of the present invention; Figure 4 This is a partial schematic diagram of a feeding unit according to an embodiment of the present invention; Figure 5 This is a cross-sectional view of a material transport box according to an embodiment of the present invention; Figure 6 This is a structural diagram of a blocking unit according to an embodiment of the present invention; Figure 7 for Figure 6 A partial enlarged schematic diagram of part A.

[0018] Description of reference numerals: 10. Heating unit; 101. Heating tank; 1011. Top area; 1012. Bottom area; 1013. Feed port; 20. Separation unit; 201. Separation layer; 2011. Gas passage; 202. Switch member; 30. Protection unit; 301. Protection tank; 302. Air outlet pipe; 303. Air inlet pipe; 304. Air extraction component; 305. Air inlet check valve; 306. Air outlet check valve; 40. Feeding unit; 401. Pretreatment box; 402. Material transport rack; 403. Crushing assembly; 404. Reciprocating assembly; 405. Half-enclosure plate; 406. Half-support plate; 4061. First feeding port; 407. Positioning assembly; 408. Bottom plate; 4081. Second feeding port; 4082. Material guide bar; 4083. Sliding cavity; 409. Temporary storage box; 4091. Material discharge component; 410. Extrusion component; 411. Power component; 412. Elastic component; 50. Sealing unit; 501. Upper sealing plate; 5011. Lower groove; 502. Lower sealing plate; 5021. Upper groove; 503. Opening and closing assembly. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] Please also refer to Figures 1 to 7 , a road milling asphalt waste recycling and reuse device of the present invention is described.

[0021] A road milling asphalt waste recycling and reuse device includes a heating unit 10, a separation unit 20, a protection unit 30 and a feeding unit 40; the heating unit 10 includes a heating tank 101 and a heating component for heating the heating tank 101; the separation unit 20 includes a separation layer 201 and a switch 202 provided in the heating tank 101, the separation layer 201 separates the heating tank 101 into a top area 1011 and a bottom area 1012 arranged in an upper and lower position, and a connection is opened in the separation layer 201 to connect the top area 101 1 and the air passage 2011 in the bottom area 1012, the switch 202 is provided at the entrance of the air passage 2011, and the switch 202 is used to open or close the air passage 2011; the protection unit 30 includes a protection tank 301 for containing inert gas, an air outlet pipe 302 connected between the protection tank 301 and the top area 1011, and an air inlet pipe 303 connected between the protection tank 301 and the bottom area 1012; the feeding unit 40 is connected to the heating tank 101, and is used to transport asphalt waste into the heating tank 101.

[0022] It should be noted that a valve is provided at the bottom of the heating tank 101 to discharge the melted asphalt waste, the separation layer 201 can be activated carbon, and the switch 202 can be an electronic valve; the heating component is a conventional heating structure and will not be described in detail in this application.

[0023] Optionally, the air passage 2011 may be one, and the opening of the air passage 2011 is located at the bottom of the separation layer 201 and then extends upward in a winding manner to the top of the separation layer 201 .

[0024] Optionally, there may be multiple air passages 2011 , and the central axis of the air passages 2011 is parallel to the up-down direction.

[0025] In the road milling asphalt waste recycling and reuse device provided in this embodiment, the asphalt waste is transported to the bottom area 1012 through the feeding unit 40. After the feeding is completed, the heating tank 101 is sealed, and then an inert gas is introduced into the bottom area 1012. After the inert gas is filled, the heating component starts to heat the asphalt waste in the heating tank 101 until the asphalt waste is melted; during the heating process of the asphalt waste, the VOCs generated rise and pass through the air channel 2011 together with the inert gas. At this time, the VOCs are adsorbed by the separation layer 201, and the inert gas passes through the separation layer 201 and then returns to the protection tank 301 for reuse.

[0026] Compared to existing technologies, inert gas is injected into the bottom region 1012 via the protective tank 301, creating an oxygen-free environment there and inhibiting the volatilization of light components in the asphalt and the oxidation embrittlement of the molecular chains. The inert gas in the bottom region 1012 rises, and simultaneously, the volatile organic compounds (VOCs) generated by the heated asphalt rise and mix with the inert gas. As the mixed gas passes through the gas passage 2011, the inert gas is not adsorbed by the separation layer 201 due to the lack of chemical interaction between the inert gas and the activated carbon. However, the VOCs react with the separation layer 201 through van der Waals forces, forming stable chemical bonds. Once the separation layer 201 reaches adsorption saturation, hot nitrogen can be introduced in the reverse direction to desorb and regenerate the VOCs, achieving VOC resource recovery and in-situ regeneration of the separation layer 201. The present invention separates VOCs from the inert gas by providing the separation layer 201. The purified inert gas is then returned to the protective tank 301 via the outlet pipe 302 for recycling, reducing the amount of inert gas required and lowering the operating costs of the equipment.

[0027] In some embodiments, see Figures 1 to 4 as well as Figure 6 A feed port 1013 communicating with the bottom area 1012 is provided at the bottom of the heating tank 101 , and a blocking unit 50 is provided at the feed port 1013 . The blocking unit 50 is used to open and close the feed port 1013 .

[0028] The feeding unit 40 includes a pretreatment box 401, a transport rack 402, a crushing assembly 403, a transport box and a reciprocating assembly 404; the pretreatment box 401 is connected to the feed port 1013, and the pretreatment box 401 is provided with a discharge port connected to the feed port 1013; the crushing assembly 403 is arranged at the discharge port, for crushing asphalt waste; one end of the transport rack 402 is arranged in the bottom area 1012, and the other end extends into the pretreatment box 401; the transport box is slidably connected to the transport rack 402, and the transport box moves along the extension direction of the transport rack 402. The transport box has a first working state of receiving asphalt waste and a second working state of releasing asphalt waste; the reciprocating assembly 404 is connected to the transport box, for driving the transport box to move back and forth.

[0029] Among them, when the material transport box is in the first working state, the material transport box is located in the pretreatment box 401 and aligned with the discharge port. After the material transport box moves into the heating tank 101, the material transport box changes from the first working state to the second working state.

[0030] It should be noted that the reciprocating assembly 404 can be a linear module; the crushing assembly 403 crushes large pieces of asphalt waste into small pieces of asphalt waste. Its specific structure is existing technology and will not be described in detail in this application.

[0031] The asphalt waste is crushed by the crushing component 403 and enters the material transport box. When the material transport box is full, the reciprocating component 404 starts to move the material transport box from the pretreatment box 401 to the heating tank 101, and then the material transport box changes from the first working state to the second working state, thereby dumping the asphalt waste inside itself into the bottom area 1012.

[0032] Crushing large pieces of asphalt waste into uniform particle size can reduce agglomeration, increase surface area, and facilitate the penetration of regeneration agents and heat transfer; at the same time, in the process of crushing asphalt waste, mechanical shear force helps to break the structure of aged asphalt and promote its fusion with new components.

[0033] In some embodiments, see Figure 6 and Figure 7 The sealing unit 50 includes an upper sealing plate 501, a lower sealing plate 502 and an opening and closing component 503; the upper sealing plate 501 is slidably connected to the heating tank 101, and the upper sealing plate 501 moves in the up and down directions. The bottom of the upper sealing plate 501 is provided with a lower groove 5011 that matches the material transport rack 402; the lower sealing plate 502 is slidably connected to the heating tank 101, and the lower sealing plate 502 moves in the up and down directions. The top of the upper sealing plate 501 is provided with an upper groove 5021 that matches the material transport rack 402; the opening and closing component 503 is connected to the upper sealing plate 501 and the lower sealing plate 502, and is used to drive the upper sealing plate 501 and the lower sealing plate 502 to move closer to or away from each other.

[0034] Optional, see Figure 6The opening and closing components 503 can be two telescopic parts, which can be telescopic in the up and down directions. The telescopic parts can be telescopic cylinders or hydraulic cylinders.

[0035] Optionally, the opening and closing component 503 may also be two linear modules, which will not be described in detail in this application.

[0036] When the upper sealing plate 501 and the lower sealing plate 502 move away from each other, the feed port 1013 is in an open state; when the upper sealing plate 501 and the lower sealing plate 502 move toward each other until they are closed, the feed port 1013 is in a closed state.

[0037] The lower groove 5011 at the bottom of the upper sealing plate 501 and the upper groove 5021 at the top of the lower sealing plate 502 are both arranged to correspond to the shape of the material transport rack 402, forming a complementary interlocking structure, blocking the oxygen channel, forming a physical seal, and at the same time avoiding heat loss in the heating tank 101; the upper sealing plate 501, the lower sealing plate 502 and the material transport rack 402 form reverse thermal deformation compensation, that is, when heated, the material transport rack 402 expands to reduce the gap, and after the upper sealing plate 501 and the lower sealing plate 502 are heated, the two shrink to further increase the pressing force, thereby realizing the intelligent effect of "the hotter the better the seal", thereby achieving the intelligent effect of "the hotter the better the seal".

[0038] In some embodiments, see Figure 4 and Figure 5 The material transport box includes two oppositely arranged half-enclosures 405, two oppositely arranged half-pallets 406 and a displacement assembly 407; the two oppositely arranged half-enclosures 405 enclose a material discharge area, the half-enclosures 405 are slidably connected to the material transport rack 402, and the half-enclosures 405 move along the extension direction of the material transport rack 402; the two oppositely arranged half-pallets 406 correspond one-to-one to the half-enclosures 405, and the half-pallets 406 are slidably connected to the corresponding half-enclosures 405, and the moving direction of the half-pallets 406 is perpendicular to the extension direction of the material transport rack 402; the displacement assembly 407 is connected to the half-pallet 406, and is used to drive the two half-pallets 406 to approach or move away from each other.

[0039] Among them, the two half pallets 406 close the bottom of the discharge area, and the material transport box is in the first working state at this time; the two half pallets 406 open the bottom of the discharge area, and the material transport box is in the second working state at this time.

[0040] In the first working state, the half-support plate 406 completely closes the discharge area to form a bearing cavity; in the second working state, the half-support plate 406 is separated to the limit position, so that the bottom of the discharge area is opened to the maximum.

[0041] In some embodiments, see Figure 5 The half support plate 406 is provided with a plurality of first feeding openings 4061 , and the plurality of first feeding openings 4061 are sequentially arranged along the moving direction of the half support plate 406 .

[0042] The material transport box also includes a bottom plate 408, which is fixedly connected to the two half-enclosure plates 405 and blocks the material discharge area. The bottom plate 408 is penetrated by a plurality of second material passing ports 4081, and the plurality of second material passing ports 4081 are arranged in sequence along the moving direction of the half-support plate 406.

[0043] Among them, the movement of the half-pallet 406 makes the first feeding port 4061 and the second feeding port 4081 misaligned, and the material transport box is in the first working state; when the half-pallet 406 moves so that the first feeding port 4061 and the second feeding port 4081 are aligned, the material transport box is in the second working state.

[0044] Optional, see Figure 5 A sliding cavity 4083 is defined in the bottom plate 408 , and the half support plate 406 is slidably disposed in the sliding cavity 4083 .

[0045] Optionally, the bottom plate 408 and the half-support plate 406 are stacked.

[0046] Multiple first feed ports 4061 and multiple second feed ports 4081 are arranged in an alternating phase, which reduces the moving stroke of the half pallet 406, thereby reducing the space occupied by the material transport box when it is in the second working state, so that the space utilization in the heating tank 101 is maximized.

[0047] In some embodiments, see Figure 5 A plurality of material guide strips 4082 are fixedly connected to the upper surface of the bottom plate 408 . The cross section of the material guide strips 4082 is triangular. The material guide strips 4082 and the second material outlet 4081 are alternately arranged.

[0048] The guide strips 4082 and the second material outlet 4081 are arranged alternately. When the material transport box is in the second working state, the asphalt waste slides down the inclined surface of the guide strips 4082 and is divided by the triangular edges to form an independent material flow with uniform thickness, avoiding the vortex retention that occurs on the traditional plane, and at the same time preventing the asphalt waste from remaining in the material transport box.

[0049] In some embodiments, see Figure 4 The feeding unit 40 also includes a temporary storage box 409 arranged in the pretreatment box 401. The temporary storage box 409 has a temporary storage area that passes through from top to bottom. The temporary storage area is aligned with the discharge port. A discharge piece 4091 for closing or opening the temporary storage area is installed at the bottom of the temporary storage box 409.

[0050] It should be noted that the discharge member 4091 can be an electronic valve.

[0051] The crushed asphalt waste falls into the temporary storage area, so that the crushing work is always in operation when the transport box enters the feeding stage in the heating tank 101. After the transport box returns to the pretreatment box 401, the discharge part 4091 is opened to dump the asphalt waste in the temporary storage area into the transport box.

[0052] In some embodiments, see Figure 4 The temporary storage box 409 is slidably connected to the pre-processing box 401, and the temporary storage box 409 moves in the horizontal direction.

[0053] The feeding unit 40 also includes an extrusion member 410, a power member 411 and an elastic member 412; the extrusion member 410 is rotatably connected to the inner wall of the pretreatment box 401, and the rotation axis of the extrusion member 410 is perpendicular to the moving direction of the temporary storage box 409; the power member 411 is transmission-connected to the extrusion member 410 for driving the extrusion member 410 to rotate; the elastic member 412 is fixed between the temporary storage box 409 and the pretreatment box 401, and the elastic member 412 has a pre-tightening force that causes the temporary storage box 409 to move toward the extrusion member 410.

[0054] Specifically, the power component 411 may be a servo motor.

[0055] Alternatively, the extrusion member 410 may be a cam.

[0056] Alternatively, the extrusion 410 may be a rod.

[0057] Optionally, the elastic member 412 may be a spring.

[0058] Optionally, the elastic member 412 may be a spring rod.

[0059] The power part 411 starts to drive the extrusion part 410 to rotate. During the rotation process, the extrusion part 410 will first squeeze the temporary storage box 409. At this time, the elastic part 412 is in a compressed state. Then the extrusion part 410 will move away from the temporary storage box 409. At this time, the elastic part 412 is in a state of releasing elastic force. This reciprocating cycle causes the temporary storage box 409 to shake, so that the asphalt waste in the temporary storage area is flattened, so that the maximum loading capacity can be reached in the temporary storage area.

[0060] In some embodiments, see Figure 1 The protection unit 30 further includes an exhaust member 304 connected to the interior of the heating tank 101 , and the exhaust member 304 is used to extract air from the heating tank 101 .

[0061] Specifically, the air suction member 304 may be an air pump.

[0062] After the sealing unit 50 closes the feed port 1013, the switch component 202 is in the open state, and the vacuum component 304 is started to extract all the air in the heating tank 101 to create an oxygen-free environment. Then, inert gas protection is injected into the heating tank 101 through the air inlet pipe 303, while maintaining the air pressure in the heating tank 101.

[0063] In some embodiments, see Figure 1The protection unit 30 also includes a monitoring component, an air inlet check valve 305 and an air outlet check valve 306; the monitoring component is arranged in the heating tank 101, and is used to monitor the air pressure in the heating tank 101; the air inlet check valve 305 is connected to the air inlet pipe 303, and is communicated with the monitoring component; the air outlet check valve 306 is connected to the air outlet pipe 302, and is communicated with the monitoring component.

[0064] It should be noted that the monitoring component is an air pressure monitoring sensor, which monitors the air pressure value in the heating tank 101 in real time.

[0065] After the vacuum component 304 is started and all the air in the heating tank 101 is extracted, the air pressure value monitored by the monitoring component falls into the first preset air pressure range, and then the air intake check valve 305 is started to inject inert gas into the heating tank 101 until the air pressure value monitored by the monitoring component falls into the second preset air pressure range, and the air intake check valve 305 stops working.

[0066] While the heating assembly is activated to raise the temperature inside the heating tank 101, the monitoring component continuously monitors the air pressure inside the heating tank 101. If the air pressure value monitored by the monitoring component is higher than a second preset air pressure range, the air outlet check valve 306 is activated to introduce the inert gas from the top area 1011 into the protective tank 301, thereby reducing the air pressure inside the heating tank 101. If the air pressure value monitored by the monitoring component is lower than the second preset air pressure range, the air inlet check valve 305 is activated to inject the inert gas from the protective tank 301 into the heating tank 101, thereby increasing the air pressure inside the heating tank 101.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A road milling asphalt waste recycling and reuse device, characterized in that: include: A heating unit, comprising a heating tank and a heating assembly for heating the heating tank; a separation unit comprising a separation layer and a switch member disposed within the heating tank, wherein the separation layer separates the heating tank into a top region and a bottom region disposed one above the other, wherein a gas passage connecting the top region and the bottom region is defined within the separation layer, and wherein the switch member is disposed at an entrance of the gas passage and is used to open or close the gas passage; a protection unit comprising a protection tank for containing an inert gas, an air outlet pipe communicating with the protection tank and the top region, and an air inlet pipe communicating with the protection tank and the bottom region; and The feeding unit is connected to the heating tank and is used to transport asphalt waste into the heating tank.

2. The road milling asphalt waste recycling and reuse device according to claim 1, characterized in that: The bottom of the heating tank is provided with a feed port communicating with the bottom area, and a blocking unit is provided at the feed port, and the blocking unit is used to open and close the feed port; The feeding unit comprises: A pretreatment box is connected to the feed port, and the pretreatment box is provided with a discharge port connected to the feed port; A crushing assembly, provided at the discharge port, for crushing asphalt waste; a material transport rack, one end of which is disposed in the bottom area and the other end of which extends into the pretreatment box; a material transport box, slidably connected to the material transport frame, the material transport box moving along the extension direction of the material transport frame, the material transport box having a first working state of receiving asphalt waste and a second working state of releasing asphalt waste; and A reciprocating assembly, connected to the material transport box, for driving the material transport box to move back and forth; Among them, when the material transport box is in the first working state, the material transport box is located in the pretreatment box and aligned with the discharge port. After the material transport box moves into the heating tank, the material transport box changes from the first working state to the second working state.

3. The road milling asphalt waste recycling and reuse device according to claim 2, characterized in that: The blocking unit comprises: An upper sealing plate is slidably connected to the heating tank, the upper sealing plate moves in an up-down direction, and a lower groove matching the material transport rack is provided at the bottom of the upper sealing plate; A lower sealing plate is slidably connected to the heating tank, the lower sealing plate moves in the up and down directions, and an upper groove matching the material transport rack is formed on the top of the upper sealing plate; and The opening and closing assembly is connected to the upper sealing plate and the lower sealing plate, and is used to drive the upper sealing plate and the lower sealing plate to move closer to or away from each other.

4. The road milling asphalt waste recycling and reuse device according to claim 2, characterized in that: The material transport box comprises: Two oppositely arranged half-enclosure plates enclose a material discharge area, the half-enclosure plates are slidably connected to the material transport rack, and the half-enclosure plates move along the extension direction of the material transport rack; Two half-support plates are arranged opposite to each other, corresponding to the half-enclosing plates one by one, the half-support plates are slidably connected to the corresponding half-enclosing plates, and the moving direction of the half-support plates is perpendicular to the extending direction of the material transport rack; and A displacement assembly connected to the half-support plates, for driving the two half-support plates toward or away from each other; Among them, the two half-pallets close the bottom of the discharge area, and the material transport box is in the first working state at this time; the two half-pallets open the bottom of the discharge area, and the material transport box is in the second working state at this time.

5. The road milling asphalt waste recycling and reuse device according to claim 4, characterized in that: The half support plate is provided with a plurality of first material passing openings, and the plurality of first material passing openings are sequentially arranged along the moving direction of the half support plate; The material transport box further includes a bottom plate, the bottom plate is fixedly connected to the two half-enclosure plates and blocks the material discharge area, and the bottom plate is penetrated by a plurality of second material passing openings, and the plurality of second material passing openings are sequentially arranged along the moving direction of the half-support plate; Among them, when the half-pallet moves so that the first feeding port and the second feeding port are not aligned, the material transport box is in the first working state; when the half-pallet moves so that the first feeding port and the second feeding port are aligned, the material transport box is in the second working state.

6. The road milling asphalt waste recycling and reuse device according to claim 5, characterized in that: A plurality of material guide strips are fixedly connected to the upper surface of the bottom plate. The cross-section of the material guide strips is triangular. The material guide strips and the second material passing ports are alternately arranged.

7. The road milling asphalt waste recycling and reuse device according to claim 2, characterized in that: The feeding unit further includes a temporary storage box arranged in the pretreatment box, the temporary storage box having a temporary storage area extending vertically, the temporary storage area being aligned with the discharge port, and a discharge member for closing or opening the temporary storage area being installed at the bottom of the temporary storage box.

8. The road milling asphalt waste recycling and reuse device according to claim 7, characterized in that: The temporary storage box is slidably connected to the pre-processing box, and the temporary storage box moves in the horizontal direction; The feeding unit further comprises: An extrusion member is rotatably connected to the inner wall of the pre-treatment box, and the rotation axis of the extrusion member is perpendicular to the moving direction of the temporary storage box; a power member, drivingly connected to the extrusion member, and configured to drive the extrusion member to rotate; and An elastic member is fixedly connected between the temporary storage box and the pre-processing box, and the elastic member has a pre-tightening force that causes the temporary storage box to move toward the extrusion member.

9. The road milling asphalt waste recycling and reuse device according to claim 2, characterized in that: The protection unit further includes an air extraction member connected to the interior of the heating tank, and the air extraction member is used to extract air from the heating tank.

10. The road milling asphalt waste recycling and reuse device according to claim 9, characterized in that: The protection unit further includes: A monitoring component is provided in the heating tank and is used to monitor the air pressure in the heating tank; an air intake check valve connected to the air intake pipe and in communication with the monitoring component; and The gas outlet one-way valve is connected to the gas outlet pipe and is in communication with the monitoring component.

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