CN118122176A - Modified asphalt foaming equipment and preparation method thereof - Google Patents

Abstract

The invention discloses modified asphalt foaming equipment and a preparation method thereof. The equipment comprises a reaction tank, wherein a heating system is arranged in the side wall of the reaction tank, the reaction tank comprises a stirring and mixing cavity and a foaming cavity positioned below the stirring and mixing cavity, and the stirring and mixing cavity and the foaming cavity are communicated through a switch valve. The planetary stirring device comprises a driving device, an upper cover, a fixed gear, a main shaft, a rotating disc and stirring paddles, and is arranged in the device, so that efficient stirring and mixing are realized. The pressure control system consists of a vacuum negative pressure pump and an air compressor, and is communicated with the foaming cavity and the stirring and mixing cavity through an air suction pipe, so that the pressure is effectively controlled. The invention solves the problems of low foaming efficiency, complex equipment structure, high cost and the like of the modified asphalt.

Description

Modified asphalt foaming equipment and preparation method thereof

Technical Field

The invention relates to the technical field of asphalt production, in particular to modified asphalt foaming equipment and a preparation method thereof.

Background

The modified asphalt is an engineering material for improving the performance and the property of asphalt by adding chemical substances or polymers and other modifying agents into the traditional asphalt, and the modification process aims to enable the asphalt to be more suitable for specific engineering requirements and improve the durability, ageing resistance, elasticity, adhesive force and other characteristics of the asphalt. The modified asphalt is widely applied to road construction and maintenance, and the performance of the modified asphalt improves the durability and the ageing resistance of the road.

However, in certain applications, there is a need to further improve the properties of asphalt to meet specific requirements, such as reduced density, improved sound insulation properties, etc. The asphalt foaming technology is an effective improvement method, and by adding a small amount of water into high-temperature asphalt, the asphalt generates fine foam so as to expand, at the moment, the physical properties of the asphalt are temporarily changed, the viscosity of the asphalt is obviously reduced, and the asphalt can be conveniently and uniformly mixed with cold and wet granules. Currently, modified asphalt foaming apparatuses existing in the market have some limitations such as low foaming efficiency, poor foam stability, etc., and thus, it is necessary to provide an improved modified asphalt foaming apparatus and a method for preparing the same, so as to overcome the limitations of the prior art.

Disclosure of Invention

The application provides modified asphalt foaming equipment and a preparation method thereof, which solve the defects of low foaming efficiency, complex equipment structure, high cost and the like of the modified asphalt in the prior art.

The invention adopts the technical scheme that: a modified asphalt foaming apparatus, comprising: the reaction tank is internally provided with a heating system, and comprises a stirring and mixing cavity and a foaming cavity arranged below the stirring and mixing cavity, wherein the stirring and mixing cavity is communicated with the foaming cavity through a switch valve; the planetary stirring device comprises a driving device, an upper cover, a fixed gear, a main shaft, a rotating disc and stirring paddles, wherein the upper cover is arranged at the top of the reaction tank, the rotating disc is coaxially arranged at the inner side of the upper cover, the driving device is arranged at the outer side of the upper cover, the main shaft penetrates through the upper cover, the rotating disc is fixedly arranged at the lower end of the main shaft, the fixed gear is arranged at the axis of the upper cover, a plurality of stirring paddles are arranged on the rotating disc, a first pinion is arranged on the stirring paddles, and the first pinion is meshed with the fixed gear to drive the stirring paddles to rotate; the pressure control system comprises a vacuum negative pressure pump and an air compressor, wherein the air inlet end of the vacuum negative pressure pump is communicated with the foaming cavity through a first air suction pipe, the air inlet end of the vacuum negative pressure pump is also communicated with the stirring and mixing cavity through a second air suction pipe, and the air outlet end of the air compressor is communicated with the stirring and mixing cavity.

Further, the heating system comprises a circulating heating pipeline which is arranged in the side wall of the reaction tank, a circulating medium is arranged in the circulating heating pipeline, and the circulating heating pipeline is communicated with a circulating pump and a heat exchanger.

Further, an interlayer is arranged between the stirring and mixing cavity and the foaming cavity, and the circulating heating pipeline is arranged in the interlayer.

Further, the planetary stirring device is further provided with a batching box, the batching box is arranged at the upper end of the rotating disc, a modifier and/or a foaming agent are arranged in the batching box, a discharge hole is formed in the bottom of the batching box, a pair of meshed main gears are further arranged at the discharge hole in the batching box, driving gears coaxial with the main gears are arranged on the outer side of the batching box, a second pinion meshed with one of the driving gears is further arranged at the top of the rotating disc, and the second pinion is meshed with the fixed gear to drive the main gears to rotate and discharge.

Further, the lower end of the rotating disc is also provided with a scraping plate, and the scraping plate is close to the inner wall of the stirring and mixing cavity.

Further, the stirring paddle comprises a stirring arm, and a spiral blade or a plurality of shearing wheels axially arranged are arranged on the stirring arm.

Further, the foaming cavity is also provided with an outlet, and the outlet is arranged at the lowest end of the horizontal position of the foaming cavity.

Further, the pressure control system further comprises an air storage tank, the air outlet end of the vacuum negative pressure pump is communicated with the air storage tank, and the air inlet end of the air compressor is communicated with the air storage tank.

A preparation method of modified asphalt foaming equipment comprises the following steps:

Step 1, adding modified asphalt into the stirring and mixing cavity, controlling the stirring and mixing cavity to be pressurized to a preset pressure value by a pressure control system, controlling the stirring and mixing cavity to be heated to a preset temperature range by a heating system, starting a planetary stirring device to stir and mix the modified asphalt, adding water into the stirring and mixing cavity to foam in the stirring and mixing process, and uniformly adding modifier powder into the stirring and mixing cavity by a batching box arranged on the rotating disc to stir while rotating and stirring by the planetary stirring device;

step 2, the pressure control system controls the stirring and mixing cavity to be depressurized to a preset pressure value, a switch valve is opened, asphalt in the stirring and mixing cavity automatically flows into the foaming cavity, and the asphalt volatilizes gas in the foaming cavity to foam.

A preparation method of modified asphalt foaming equipment comprises the following steps:

Step 1, adding modified asphalt into the stirring and mixing cavity, controlling the stirring and mixing cavity to be pressurized to a preset pressure value by a pressure control system, controlling the stirring and mixing cavity to be heated to a preset temperature range by a heating system, starting a planetary stirring device to stir and mix the modified asphalt, and uniformly adding foaming agent powder into the stirring and mixing cavity by a batching box arranged on a rotating disc while rotating and stirring by the planetary stirring device;

step 2, the pressure control system controls the stirring and mixing cavity to be depressurized to a preset pressure value, a switch valve is opened, asphalt in the stirring and mixing cavity automatically flows into the foaming cavity, and the asphalt volatilizes gas in the foaming cavity to foam.

Compared with the prior art, the asphalt and the modifier are stirred and mixed in the stirring and mixing cavity, stirring and pre-foaming treatment are carried out under the conditions of high pressure and high temperature, so that the modifier and the asphalt are fully mixed and diffused, the reaction is promoted, the modifying effect is improved, the asphalt is easier to flow and mix, the asphalt is directly sent into the foaming cavity after stirring treatment, and the asphalt is quickly foamed in a negative pressure environment, thus the uneven distribution of bubbles or the variation of the size of air holes can be effectively avoided, the foaming process is quicker, the waste of energy sources is reduced, and the production cost is saved. Solves the defects of low foaming efficiency, complex equipment structure, high cost and the like of the modified asphalt existing in the prior art.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic structural view of a modified asphalt foaming apparatus of the present invention;

FIG. 2 is a schematic cross-sectional structure of a modified asphalt foaming apparatus according to the present invention;

FIG. 3 is a schematic perspective view of a planetary stirring device (omitting an upper cover and a batching box);

FIG. 4 is a schematic top view of the dispensing cartridge of the present invention;

fig. 5 is a schematic cross-sectional view of a dispensing cartridge according to the present invention.

1. A reaction tank; 2. a heating system; 3. stirring the mixing cavity; 31. a foaming chamber; 32. opening and closing a valve; 4. a planetary stirring device; 41. a driving device; 42. an upper cover; 43. a fixed gear; 44. a main shaft; 45. a rotating disc; 46. stirring paddles; 47. a first pinion gear; 48. a batching box; 481. a discharge port; 49. a main gear; 50. a second pinion; 51. a scraper; 52. a drive gear; 6. a pressure control system; 61. a vacuum negative pressure pump; 62. an air compressor; 63. a gas storage tank; 64. a first air suction pipe; 65. and a second suction pipe.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the 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 for purposes of illustration only and are not intended to limit the scope of the invention.

The invention provides modified asphalt foaming equipment, which is shown in figures 1 and 2 and comprises the following components: the reaction tank 1 is used for loading modified asphalt raw materials, the planetary stirring device 4 is arranged in the reaction tank 1 and used for stirring and mixing the modified asphalt raw materials, and the pressure control system 6 is used for controlling the pressure environment in the reaction tank 1.

Specifically, the reaction tank 1 mainly comprises a stirring and mixing cavity 3 and a foaming cavity 31 arranged below the stirring and mixing cavity 3, a heating system 2 is arranged in the side wall of the reaction tank 1, the heating system 2 comprises a circulating heating pipeline arranged in the side wall of the reaction tank 1 and is provided with a circulating medium, the circulating heating pipeline is communicated with a circulating pump and a heat exchanger, and can provide proper temperature control when needed so as to promote chemical reaction and material diffusion in the foaming process, and the design can ensure that the constant temperature is maintained in the foaming process, so that the activity of a foaming agent and the stability of modified asphalt are enhanced, and the foaming efficiency and the product quality are improved. The outlet is designed at the lowest end of the horizontal position of the foaming chamber 31 of the planetary stirring device 4, which layout carefully takes into account the action of gravity and the flow characteristics of the material during the mixing of the asphalt. Placing the discharge port 481 at the lowest end helps to ensure that the asphalt mixture flows sufficiently, effectively avoiding the dead angle or residue when discharging the mixture, and ensuring complete discharge of the mixture.

Further, an interlayer is arranged between the stirring and mixing cavity 3 and the foaming cavity 31, the circulating heating pipeline is arranged in the interlayer, and the circulating heating pipeline is arranged in the interlayer, so that the space between the stirring and mixing cavity 3 and the foaming cavity 31 can be uniformly heated, the uniform temperature distribution in the reaction tank 1 can be ensured, and the problems of incomplete reaction or unstable product quality caused by nonuniform temperature are avoided. The circulation heating pipe can rapidly transfer heat to the interlayer space between the agitation mixing chamber 3 and the foaming chamber 31 by providing a constant heating source, thereby accelerating the heating process of the asphalt material. Therefore, the efficiency of the foaming process can be improved, the production period is shortened, and the production efficiency is improved.

In order to better realize the negative pressure foaming technology, the invention adopts the vacuum negative pressure pump 61 and the air compressor 62 as auxiliary devices, the pressure control system 6 also comprises the air storage tank 63, the air outlet end of the vacuum negative pressure pump 61 is communicated with the air storage tank 63, the air inlet end of the air compressor 62 is communicated with the air storage tank 63, the air inlet end of the vacuum negative pressure pump 61 is communicated with the foaming cavity 31 through the first air suction pipe 64, and the air inlet end of the vacuum negative pressure pump is also communicated with the stirring and mixing cavity 3 through the second air suction pipe 65, thereby realizing the accurate control of the air pressure in the reaction tank 1. Meanwhile, the exhaust end of the air compressor 62 is communicated with the stirring and mixing cavity 3, so that the gas pressure in the reaction tank 1 can be regulated as required, and the stable foaming process is ensured. The air storage tank 63 plays a key role in the negative pressure foaming technology, the functions of the air storage tank 63 mainly comprise recycling of hot air and accurate pressure control, the air storage tank 63 is communicated with the air outlet end of the vacuum negative pressure pump 61 and the air inlet end of the air compressor 62, so that the waste gas and fresh air can be effectively recycled, part of the waste gas contains heat energy in the foaming process, the waste gas is sent into the air storage tank 63 for storage, the heat energy in the waste gas can be effectively recycled, and the waste gas is reinjected into a system when needed to provide a required heating effect, and the recycling of the hot air can not only save energy consumption, but also reduce the heat energy emission to the external environment, and meet the environmental protection requirements of energy conservation and emission reduction. The air storage tank 63 can also accurately control the pressure of the stirring and mixing cavity 3 so as to ensure the safe operation of equipment, the pressure inside the stirring and mixing cavity 3 needs to be accurately controlled in the negative pressure foaming process so as to ensure that the formation and release processes of bubbles can be smoothly carried out, meanwhile, equipment damage or safety accidents caused by overhigh or overlow pressure are avoided, the air storage tank 63 is used as a key component part of the pressure control system 6, gas can be stably stored and released, the regulation of the pressure inside the stirring and mixing cavity 3 is realized, and the stability and safety of the foaming process are ensured.

Further, as shown in fig. 2 and 3, the planetary stirring device 4 is used as a core component in the modified asphalt foaming apparatus, and its design and function are not only limited to stirring and mixing asphalt materials and ingredients, but also relate to control and optimization of the production process and improvement and guarantee of the product quality. The device comprises a driving device 41, an upper cover 42, a fixed gear 43, a main shaft 44, a rotating disc 45, a stirring paddle 46 and other key components. The upper cover 42 is positioned at the top of the reaction tank 1, and the rotating disk 45 can be stably installed inside the upper cover 42 by coaxially disposing the inner side of the upper cover 42. The main shaft 44 passes through the upper cover 42, and a rotating disk 45 is fixed at its lower end, thus ensuring stable rotation of the rotating disk 45. The fixed gear 43 is disposed at the axial center of the upper cover 42, or the fixed gear 43 is also disposed on the upper bracket outside the upper cover 42, and the plurality of stirring paddles 46 are disposed on the rotating disk 45, and the stirring paddles 46 rotate by the first pinion 47 meshed with the fixed gear 43, thereby stirring and mixing the asphalt material. The design of the planetary stirring device 4 takes into account the actual demands and operational convenience in the production process. The device has the advantages of reasonable structural design, simplicity and convenience in operation, easiness in maintenance and cleaning, and thus, the production efficiency and the convenience in operation are improved.

Preferably, the paddles 46 are an important component of the planetary stirring device 4, the design and function of which directly affects the mixing effect of the asphalt material and the ingredients. The paddles 46 comprise a paddle arm provided with helical blades or a plurality of axially disposed shearing wheels which cooperate to achieve thorough mixing and agitation of the asphalt material and ingredients. The arms are the main body portion of the paddles 46 and generally assume a curved or bent configuration to accommodate the configuration and volume of the mixing chamber 3. The design of the stirring arms takes into account the dynamics and hydrodynamic principles during stirring to ensure that the paddles 46 can effectively mix and stir the asphalt material and ingredients, and the stirring arms are provided with helical blades or axially arranged shearing wheels, which are designed to increase the contact area and mixing efficiency between the paddles 46 and the mixed material, and the helical blades, by their special shape, can push and stir the mixed material along the axial and circumferential directions of the paddles 46, thereby achieving uniform mixing of the asphalt and ingredients. The shearing wheel arranged axially can apply shearing force in the stirring process, so that the interaction and the mixing effect between the mixed materials are further promoted, and the mixing is more thorough.

The combination of these designs makes the stirring paddle 46 capable of fully utilizing the mechanical energy and the fluid dynamics principle in the operation process of the planetary stirring device 4 to realize efficient mixing and stirring of asphalt materials and ingredients, and the arrangement of the spiral blades and the shearing wheels not only improves the mixing efficiency, but also can avoid dead angles and caking phenomena between materials, and ensures the uniformity and stability of mixing.

As shown in fig. 2, 4 and 5, the planetary stirring device 4 is further provided with a dispensing box 48, which is positioned at the upper end of the rotating disc 45 and internally filled with a modifier and/or a foaming agent, and a discharge port 481 is arranged at the bottom of the dispensing box 48 so as to ensure that the modifier and/or the foaming agent can be accurately and timely injected into the reaction tank 1. A pair of meshing main gears 49 are provided at the outlet 481 in the ingredient box 48, and a drive gear 52 coaxial with these main gears 49 is provided outside the ingredient box 48. In addition, the second pinion 50 on the top of the rotary disk 45 meshes with one of the drive gears 52, by which the modifier and/or foaming agent in the ingredient box 48 can be accurately injected into the stirring and mixing chamber 3, ensuring uniformity and stability of the ingredients. At the bottom of the planetary stirring device 4, a scraper 51 is also provided, which is located close to the inner wall of the stirring and mixing chamber 3. The design can ensure that asphalt materials and ingredients can be fully mixed, prevent the asphalt materials from caking or adhering to the wall of the tank in the stirring process, and further ensure the uniformity and stability of stirring. In the use process, when the planetary stirring device 4 operates, the second pinion 50 can be simultaneously driven to rotate, so as to drive the main gear 49 to relatively rotate, on one hand, the powder in the batching box 48 can be pumped to the lower discharge port 481 by the relative rotation of the main gear 49, and the batching box 48 rotates along with the rotation of the rotating disc 45, and the powder can be uniformly scattered into the batching box 48 when the asphalt is stirred, so that the mixing effect and the production efficiency of the asphalt are improved, and the powder in the batching box 48 comprises, but is not limited to, a modifier or a foaming agent, and can also be mixed powder required by the preparation of modified asphalt such as a modifier, a stabilizer and the like.

Further, the invention also provides a preparation method of the modified asphalt applied to the modified asphalt foaming equipment, and the preparation method comprises the following two steps:

Method I, adding water for foaming

Step 1: the modified asphalt is added to the agitation mixing chamber 3, and the agitation mixing chamber 3 is pressurized to a preset pressure value by the pressure control system 6. Simultaneously, the stirring and mixing cavity 3 is heated to a preset temperature range through the heating system 2, and then the planetary stirring device 4 is started to stir and mix the modified asphalt. In the stirring and mixing process, the modified asphalt is foamed by adding water to the stirring and mixing cavity 3. The planetary stirring device 4 uniformly adds the modifier powder into the stirring and mixing chamber 3 through the ingredient box 48 arranged on the rotating disk 45 while stirring in a rotating manner.

Step 2: the pressure control system 6 controls the stirring and mixing cavity 3 to be depressurized to a preset pressure value, and then opens the switch valve 32, so that the modified asphalt in the stirring and mixing cavity 3 automatically flows into the foaming cavity 31. In the foaming chamber 31, the modified asphalt volatilizes gas, thereby realizing a foaming process.

The key advantages of this preparation method are: through realizing mixing and foaming's integration operation in planetary stirring device 4, the production flow has been simplified, production efficiency has been improved, manufacturing cost and energy consumption have been reduced, through planetary stirring device 4's accurate batching control, modifier powder can be added into stirring mixing chamber 3 by accurate even, guaranteed the intensive mixing and the evenly distributed of modifier and pitch, thereby improved quality and performance of product, through adding water in stirring mixing process and foaming, design and stirring mixing chamber 3's pressure control of stirring rake 46 are combined, quick, even foaming of modified pitch has been realized, foaming efficiency and quality have been improved.

Method I, adding foaming agent for foaming

Step 1, adding modified asphalt into a stirring and mixing cavity 3, controlling the stirring and mixing cavity 3 to be pressurized to a preset pressure value by a pressure control system 6, controlling the stirring and mixing cavity 3 to be heated to a preset temperature range by a heating system 2, starting a planetary stirring device 4 to stir and mix the modified asphalt, and uniformly adding foaming agent powder into the stirring and mixing cavity 3 by the planetary stirring device 4 through a batching box 48 arranged on a rotating disc 45 while rotating and stirring;

Step 2, the pressure control system 6 controls the stirring and mixing cavity 3 to be depressurized to a preset pressure value, the switch valve 32 is opened, asphalt in the stirring and mixing cavity 3 automatically flows into the foaming cavity 31, and the asphalt volatilizes gas in the foaming cavity 31 to foam.

The method adopts a physical foaming mode, and the asphalt is expanded by adding the foaming agent, so that the operation is relatively simple and the efficiency is high. The pressure control system 6 and the heating system 2 can accurately control the pressure and the temperature of the stirring and mixing cavity 3, so that the uniformity and the stability of the foaming process are favorably controlled, and the foaming process is carried out in the sealed stirring and mixing cavity 3, so that the contact between asphalt and the foaming agent is sufficient, the utilization rate of materials is favorably improved, and the resource waste is reduced.

The invention has the advantages that: firstly, asphalt, modifier and the like are stirred and mixed in a stirring and mixing cavity 3, stirring and pre-foaming treatment are carried out under the conditions of high pressure and high temperature, the molecular movement speed is accelerated under the conditions of high temperature and high pressure, the modifier and the asphalt are fully mixed and diffused, the reaction is promoted, the modifier and the asphalt can be fully interacted, the crosslinking reaction or other modification reaction between the asphalt and the modifier is accelerated, the modification effect is improved, the viscosity of the asphalt can be reduced by the treatment of high temperature and high pressure, and the asphalt is easier to flow and mix. This helps ensure that the modifier is thoroughly mixed with the asphalt, thereby improving the modifying effect and uniformity of the product. Then, directly send into foaming chamber 31 after handling stirring, foam fast under the negative pressure environment, directly send into foaming chamber 31 with the material after handling stirring, foam under the negative pressure environment, can realize quick high-efficient production, foam under the negative pressure environment and can ensure that the foaming bubble evenly distributed and spread rapidly, can effectively avoid the uneven distribution of bubble like this or the size of air vent is different, improved quality and outward appearance of product, the foaming process is more rapid simultaneously, also reduced the waste of the energy, be favorable to saving manufacturing cost. The invention is applicable to various foaming modes and can obtain good effects.

The foregoing description of the preferred embodiment of the invention is not intended to limit the invention to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims (10)

1. A modified asphalt foaming apparatus, comprising:

the reaction tank is internally provided with a heating system, and comprises a stirring and mixing cavity and a foaming cavity arranged below the stirring and mixing cavity, wherein the stirring and mixing cavity is communicated with the foaming cavity through a switch valve;

The planetary stirring device comprises a driving device, an upper cover, a fixed gear, a main shaft, a rotating disc and stirring paddles, wherein the upper cover is arranged at the top of the reaction tank, the rotating disc is coaxially arranged at the inner side of the upper cover, the driving device is arranged at the outer side of the upper cover, the main shaft penetrates through the upper cover, the rotating disc is fixedly arranged at the lower end of the main shaft, the fixed gear is arranged at the axis of the upper cover, a plurality of stirring paddles are arranged on the rotating disc, a first pinion is arranged on the stirring paddles, and the first pinion is meshed with the fixed gear to drive the stirring paddles to rotate;

The pressure control system comprises a vacuum negative pressure pump and an air compressor, wherein the air inlet end of the vacuum negative pressure pump is communicated with the foaming cavity through a first air suction pipe, the air inlet end of the vacuum negative pressure pump is also communicated with the stirring and mixing cavity through a second air suction pipe, and the air outlet end of the air compressor is communicated with the stirring and mixing cavity.

2. The modified-asphalt foaming apparatus according to claim 1, wherein said heating system comprises a circulation heating pipe built in a side wall of said reaction tank, a circulation medium is provided in said circulation heating pipe, and said circulation heating pipe communicates with a circulation pump and a heat exchanger.

3. The modified asphalt foaming apparatus of claim 2 wherein an interlayer is provided between said agitation mixing chamber and said foaming chamber, said circulation heating conduit being provided in said interlayer.

4. The modified asphalt foaming apparatus according to claim 1 wherein said planetary stirring device is further provided with a batching box, said batching box is provided at an upper end of said rotary disc, a modifier and/or a foaming agent are provided in said batching box, a discharge port is provided at a bottom of said batching box, a pair of meshed main gears is further provided at a discharge port in said batching box, a driving gear coaxial with each of said main gears is provided at an outer side of said batching box, and a second sub gear meshed with one of said driving gears is further provided at a top of said rotary disc, said second sub gear being meshed with said fixed gear to drive said main gears to rotate for discharging.

5. The modified-asphalt foaming apparatus of claim 4 wherein said rotating disc is further provided at a lower end thereof with a scraper, said scraper being adjacent to an inner wall of said agitation mixing chamber.

6. The modified-asphalt foaming apparatus of claim 1 wherein said stirring paddle comprises a stirring arm provided with a helical blade or a plurality of axially disposed shearing wheels.

7. The modified-asphalt foaming apparatus of claim 1 wherein said foaming chamber is further provided with an outlet, said outlet being provided at the lowest horizontal end of said foaming chamber.

8. The modified-asphalt foaming apparatus according to claim 1, wherein the pressure control system further comprises an air tank, an air outlet end of the vacuum negative pressure pump is communicated with the air tank, and an air inlet end of the air compressor is communicated with the air tank.

9. A method for producing the modified-asphalt foaming apparatus as defined in any one of claims 1 to 8, characterized by comprising:

Step 1, adding modified asphalt into the stirring and mixing cavity, controlling the stirring and mixing cavity to be pressurized to a preset pressure value by a pressure control system, controlling the stirring and mixing cavity to be heated to a preset temperature range by a heating system, starting a planetary stirring device to stir and mix the modified asphalt, adding water into the stirring and mixing cavity to foam in the stirring and mixing process, and uniformly adding modifier powder into the stirring and mixing cavity by a batching box arranged on the rotating disc to stir while rotating and stirring by the planetary stirring device;

step 2, the pressure control system controls the stirring and mixing cavity to be depressurized to a preset pressure value, a switch valve is opened, asphalt in the stirring and mixing cavity automatically flows into the foaming cavity, and the asphalt volatilizes gas in the foaming cavity to foam.

10. A method for producing the modified-asphalt foaming apparatus as defined in any one of claims 1 to 8, characterized by comprising:

Step 1, adding modified asphalt into the stirring and mixing cavity, controlling the stirring and mixing cavity to be pressurized to a preset pressure value by a pressure control system, controlling the stirring and mixing cavity to be heated to a preset temperature range by a heating system, starting a planetary stirring device to stir and mix the modified asphalt, and uniformly adding foaming agent powder into the stirring and mixing cavity by a batching box arranged on a rotating disc while rotating and stirring by the planetary stirring device;

step 2, the pressure control system controls the stirring and mixing cavity to be depressurized to a preset pressure value, a switch valve is opened, asphalt in the stirring and mixing cavity automatically flows into the foaming cavity, and the asphalt volatilizes gas in the foaming cavity to foam.