A foamed asphalt generating device and a method of using the same

Abstract

The present invention relates to the technical field of road repair, and specifically to a foamed asphalt generating device and a method for using the same, comprising: a hollow suspension shaft is inserted from top to bottom into the inner cavity of a foaming box, the lower end of the hollow suspension shaft is fixedly connected to a hollow cylinder, the blade width of a guide vane is smaller than the radius of the hollow suspension shaft, and the guide vane drives water and air to have a tendency to flow from bottom to top; a protective cover is sleeved on the outer side of the hollow cylinder and fixedly connected to the hollow cylinder, a spray assembly itself is arc-shaped and tilted, and the other end of the spray assembly is connected to the inner cavity of the hollow cylinder; the beneficial effect is: by inserting a hollow suspension shaft from top to bottom into the inner cavity of the foaming box, the lower end of the hollow suspension shaft is connected to the hollow cylinder, during the spraying process, the protective cover rotates slowly, and water and air are gradually sprayed into the surrounding asphalt, after the asphalt is gradually foamed, the viscosity of the protective cover is reduced, and the rotation speed of the protective cover is gradually increased, which effectively improves the dispersion degree of water and air and improves the performance index of the foamed asphalt.

Description

Technical Field

[0001] The invention relates to the technical field of road repair, in particular to a foamed asphalt generating device and a use method thereof. Background Art

[0002] Foamed asphalt is mainly used for road repairs such as urban roads, rural roads, and airport runways. The foaming principle is to spray water and compressed air into hot asphalt at a certain pressure and temperature. The water absorbs enough heat in the asphalt to produce vaporization. The resulting pressure causes the asphalt to form bubbles surrounded by an asphalt film. The bubbles continue to grow under the steam expansion pressure until the surface tension of the asphalt film is balanced with the steam pressure. As the heat of the water vapor dissipates, the pressure drops, and the volume of the bubbles shrinks until they disappear.

[0003] A Chinese invention with publication number CN108867251B discloses a foamed asphalt generator, which utilizes the shear dispersion force generated by the engagement of the rotor with the stator during high-speed rotation to achieve a high dispersion of water and air in the asphalt, thereby improving the performance indicators of the foamed asphalt.

[0004] However, asphalt still has a high viscosity in a molten state, and the asphalt is wrapped around the outside of the rotor, which will greatly hinder the rotation of the rotor, thereby affecting the mixing and dispersion of water, air and asphalt. To this end, the present invention proposes a foamed asphalt generating device and a method of using the same to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a foamed asphalt generating device and a method of using the same, so as to solve the problem that high-viscosity asphalt is difficult to fully mix and disperse with water and air as mentioned in the background art.

[0006] To achieve the above object, the present invention provides the following technical solution: a foamed asphalt generating device, comprising:

[0007] A foaming box, wherein a hollow suspension shaft is inserted into the inner cavity of the foaming box from top to bottom, a hollow cylinder is fixedly connected to the lower end of the hollow suspension shaft, a mixture of water and air flowing from top to bottom is passed through the inner cavity of the hollow suspension shaft, a spiral guide blade is fixedly provided on the inner wall of the hollow suspension shaft, the blade width of the guide blade is smaller than the radius of the hollow suspension shaft, and when the hollow suspension shaft rotates, the guide blade drives the water and air to have a tendency to flow from bottom to top;

[0008] A protective cover is sleeved on the outside of the hollow cylinder and fixedly connected to the hollow cylinder. A plurality of injection assemblies distributed in a circular array are arranged between the protective cover and the hollow cylinder. The injection assemblies themselves are arc-shaped and inclined. One end of the injection assembly passes through the inner wall of the protective cover, and the other end of the injection assembly is connected to the inner cavity of the hollow cylinder.

[0009] Preferably, the injection assembly includes an outer shell, with the two ends of the outer shell being respectively arranged as a nozzle and an accelerating tube, a fixed block being fixedly connected to the middle of the inner cavity of the outer shell, and a spiral through hole being penetrated at the edge of the surface of the fixed block, a sliding block being slidably installed at one end of the inner cavity of the outer shell, a central through hole being penetrated at the center of the surface of the sliding block, and the central through hole and the spiral through hole are staggered with each other, and an elastic member is arranged on the side of the sliding block away from the fixed block.

[0010] Preferably, the inner diameters of the nozzle and the accelerating tube are smaller than the inner diameter of the outer shell, the elastic member is a thrust spring, and the two ends of the elastic member respectively abut against the surface of the sliding block and the inner wall of the end of the outer shell, a sealing gasket made of rubber material is provided at the joint between the sliding block and the fixed block, and a plurality of spiral through holes are provided and distributed in a circular array.

[0011] Preferably, a connecting tube is fixedly sleeved on the outer side of the end of the accelerating tube, one end of the connecting tube is fixedly connected to the hollow cylinder, the side wall of the protective cover is provided with an oblique slot for the nozzle to pass through, and a rubber sealing gasket is provided at the connection between the inner wall of the oblique slot and the nozzle surface, the end of the injection assembly is kept flush with the outer side wall of the protective cover, and an auger-shaped guide plate is fixedly provided on the inner wall of the accelerating tube.

[0012] Preferably, a sealing sleeve is fixedly provided in the middle of the upper surface of the protective cover, and the sealing sleeve is sleeved on the outside of the hollow cylinder, the bottom of the hollow cylinder and the bottom of the protective cover are fixedly connected by connecting bolts, the bottom of the protective cover is inlaid with an annular baffle, and the annular baffle covers the end of the connecting bolt, a heat exchange cylinder is fixedly installed in the middle of the inner cavity of the hollow cylinder, a heating rod is penetrated through the bottom of the protective cover, and the upper end of the heating rod is inserted into the inner cavity of the heat exchange cylinder.

[0013] Preferably, a collecting ring is fixedly installed in the middle part of the inner wall of the foaming box, the inner wall of the collecting ring is inclined and has a plurality of evenly distributed filtering holes, the inner diameter of the collecting ring is larger than the outer diameter of the protective cover, the interior of the collecting ring is hollow, and the outer wall of the collecting ring is fixedly connected to a discharge pipe, and the heating rod is fixedly connected to the bottom of the foaming box.

[0014] Preferably, a mixing chamber is provided at the upper end of the hollow suspension shaft, and the bottom of the mixing chamber is rotatably connected to the hollow suspension shaft via a rotating connector, and a water inlet pipe and an air inlet pipe are respectively connected to the two sides of the mixing chamber, and the water inlet pipe and the air inlet pipe are symmetrically distributed around the center of the mixing chamber, and the water inlet pipe and the air inlet pipe are fixedly installed on the outside of the mixing chamber in a manner of being tangent to the side of the mixing chamber, and a pressure relief valve is fixedly installed on the top of the mixing chamber.

[0015] Preferably, two suspension frames parallel to each other are arranged on the outside of the mixing chamber, a suspension ring is fixedly connected between the lower ends of the two suspension frames, the suspension ring is rotatably sleeved on the outside of the hollow suspension shaft, and a bearing is installed between the two, and the upper ends of the two suspension frames are fixedly connected to the connecting beam plate.

[0016] A method for using the foamed asphalt generating device as described above specifically comprises the following steps:

[0017] Step 1: Place the hollow cylinder and protective cover at the lower end of the hollow suspension shaft into the bottom of the inner cavity of the foaming box from top to bottom, and make the heat exchange cylinder sleeve movable on the outer side of the upper end of the heating rod;

[0018] Step 2: Water and air are introduced into the inner cavity of the mixing chamber through the water inlet pipe and the air inlet pipe respectively for mixing. The mixture of water and air is transported to the inner cavity of the hollow cylinder through the hollow suspension shaft, and is sprayed into the molten asphalt outside the protective cover after passing through the spraying assembly. The reaction force generated by the spraying of water and air on the protective cover by the spraying assembly drives the protective cover to rotate, thereby uniformly spraying the mixture of water and air into the surrounding molten asphalt.

[0019] Step three: after the molten asphalt gradually foams, the viscosity of the asphalt on the protective cover decreases, the rotation speed of the protective cover increases, and the guide vanes on the inner wall of the hollow suspension shaft rotate to increase the resistance of the water and air mixture flowing from top to bottom in the inner cavity of the hollow suspension shaft. The flow rate of the water and air mixture sprayed by the injection assembly decreases, and the rotation speed of the protective cover slows down until it reaches stability.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention has a hollow suspension shaft inserted from top to bottom in the inner cavity of the foaming box, the lower end of the hollow suspension shaft is connected to a hollow cylinder, a protective cover is fixedly sleeved on the outer side of the hollow cylinder, a plurality of injection components distributed in a ring array are installed between the protective cover and the hollow cylinder, and the injection component itself is in an inclined arc shape, and the front end of the injection component penetrates the inner wall of the protective cover, and can spray a high-pressure mixture of water and air into the asphalt outside the protective cover together, and during the injection process, the protective cover is subjected to the reaction force of water and air, and at the same time, it is subjected to the viscosity after being wrapped by asphalt, so the protective cover will rotate slowly, and gradually spray water and air into the surrounding asphalt, after the surrounding asphalt is gradually foamed, the viscosity of the asphalt on the protective cover is reduced, and the rotation speed of the protective cover is gradually increased, thereby effectively improving the dispersion degree of water and air and improving the performance index of the foamed asphalt, in addition, a guide blade is arranged on the inner wall of the hollow suspension shaft, when the hollow suspension shaft rotates faster with the protective cover, the hollow suspension shaft can reduce the injection amount of water and air, thereby avoiding that the ratio of water and air in the foamed asphalt is too large and affects the performance of the foamed asphalt. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a half-section schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is an exploded schematic diagram of the overall structure of the present invention;

[0024] Figure 3 A half-section schematic diagram of the hollow cylinder and protective cover structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the interior of the protective cover structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the internal structure of the injection assembly of the present invention;

[0027] Figure 6 It is a schematic cross-sectional view of the fixed block structure of the present invention;

[0028] Figure 7 It is a three-dimensional schematic diagram of the mixing chamber and the suspension frame structure of the present invention;

[0029] Figure 8 It is a schematic cross-sectional view of the mixing chamber structure of the present invention;

[0030] Fig. 9 For the present invention Figure 1 A schematic diagram of the enlarged structure in the middle.

[0031] In the figure: 1. foaming box; 2. hollow suspension shaft; 21. guide blade; 22. bearing; 3. hollow cylinder; 31. heat exchange cylinder; 4. protective cover; 41. sealing sleeve; 42. connecting bolt; 43. annular baffle; 44. oblique notch; 5. injection assembly; 51. outer shell; 52. nozzle; 53. acceleration tube; 531. guide plate; 54. connecting pipe; 55. fixing block; 551. spiral through hole; 56. sliding block; 561. central through hole; 57. elastic part; 6. mixing chamber; 61. water inlet pipe; 62. air inlet pipe; 63. rotary connector; 64. pressure relief valve; 7. suspension bracket; 71. suspension sleeve; 72. connecting beam plate; 8. collecting ring; 81. filter hole; 9. discharge pipe; 10. heating rod. DETAILED DESCRIPTION

[0032] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "one", "first", "second", "third", "fourth", "fifth", "sixth" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] For the purpose of simplicity and illustration, the principles of the embodiments are mainly described by reference to examples. In the following description, many specific details are proposed to provide a thorough understanding of the embodiments. However, it is obvious that for those of ordinary skill in the art, these embodiments may not be limited to these specific details in practice. In some instances, known methods and structures are not described in detail to avoid making these embodiments unnecessarily difficult to understand. In addition, all embodiments can be used in combination with each other.

[0036] See also Figures 1 to 9 , the present invention provides a technical solution:

[0037] Embodiment 1, a foamed asphalt generating device, comprises: a foaming box 1 and a protective cover 4.

[0038] Specifically, a hollow suspension shaft 2 is inserted from top to bottom in the inner cavity of the foaming box 1, and a hollow cylinder 3 is fixedly connected to the lower end of the hollow suspension shaft 2. A mixture of water and air flows from top to bottom in the inner cavity of the hollow suspension shaft 2, and the water and air enter the inner cavity of the hollow cylinder 3 after mixing. A spiral guide blade 21 is fixedly provided on the inner wall of the hollow suspension shaft 2, and the blade width of the guide blade 21 is smaller than the radius of the hollow suspension shaft 2. When the hollow suspension shaft 2 rotates, the guide blade 21 drives the water and air to have a tendency to flow from bottom to top. When the hollow suspension shaft 2 itself does not rotate or the rotation speed is low, the water and air in the inner cavity of the hollow suspension shaft 2 can flow from top to bottom to the inner cavity of the hollow cylinder 3 along the spiral direction of the guide blade 21, and when the rotation speed of the hollow suspension shaft 2 increases, the guide blade 21 will hinder the flow of water and air from top to bottom, thereby reducing the flow rate of the mixture of water and air entering the inner cavity of the hollow cylinder 3.

[0039] Secondly, the protective cover 4 is sleeved on the outside of the hollow cylinder 3 and fixedly connected to the hollow cylinder 3. A plurality of injection assemblies 5 distributed in a ring array are arranged between the protective cover 4 and the hollow cylinder 3. The protective cover 4 is mainly used to protect the injection assemblies 5 to prevent the molten asphalt in the inner cavity of the foaming box 1 from coating the surface of the injection assemblies 5. Figure 1 As shown, the surface of the protective cover 4 itself is relatively smooth. Although the molten asphalt is coated on the outside of the protective cover 4, the viscosity of the molten asphalt on the surface of the protective cover 4 is not too large, so the protective cover 4 can rotate at a certain speed inside the molten asphalt. In addition, the injection component 5 itself is arc-shaped and inclined. One end of the injection component 5 passes through the inner wall of the protective cover 4, and the other end of the injection component 5 is connected to the inner cavity of the hollow cylinder 3. When the mixture of water and air is sprayed out through the injection component 5, the reaction force generated by the water and air on the injection component 5 can drive the protective cover 4 to rotate and drive the hollow suspension shaft 2 to rotate accordingly. Because the asphalt is in a molten state when the mixture of water and air is first sprayed, the viscosity of the asphalt on the protective cover 4 is still relatively large, so the rotation speed of the protective cover 4 is relatively slow, and as the water and air are sprayed onto the molten asphalt As the amount in the asphalt gradually increases, the molten asphalt gradually foams, the viscosity of the asphalt itself decreases, the viscous force on the protective cover 4 decreases, the rotation speed of the protective cover 4 gradually increases, and the rotation speed of the hollow suspension shaft 2 is driven to increase. At this time, the resistance of the guide blade 21 to the mixture of water and air flowing in the inner cavity of the hollow suspension shaft 2 gradually increases, so the mixture of water and air entering the inner cavity of the hollow cylinder 3 gradually decreases, the injection flow rate of the injection component 5 gradually decreases, and the rotation speed of the protective cover 4 will also gradually decrease until the viscous force of the asphalt on the protective cover 4 and the injection amount of the injection component 5 reach a balance. At this time, the protective cover 4 keeps rotating to evenly spray water and air into the asphalt, and the flow rate of water and air will not be too large, thereby avoiding waste of resources and avoiding excessive proportion of water and air in the foamed asphalt affecting the performance of the foamed asphalt.

[0040] In order to prevent asphalt from entering the inner cavity of the hollow cylinder 3, the injection assembly 5 of the present application includes an outer shell 51, and the two ends of the outer shell 51 are respectively provided with a nozzle 52 and an accelerating tube 53. A fixing block 55 is fixedly connected to the middle of the inner cavity of the outer shell 51, and a spiral through hole 551 is penetrated and opened at the edge of the surface of the fixing block 55. The flow path of the mixture of water and air in the injection assembly 5 is: entering the outer shell 51 from the accelerating tube 53, then passing through the spiral through hole 551, and finally spraying out from the nozzle 52; a sliding block 56 is slidably installed at one end of the inner cavity of the outer shell 51, and the center of the surface of the sliding block 56 is provided with a spiral through hole 551. A central through hole 561 is provided through the center, and the central through hole 561 is offset from the spiral through hole 551. An elastic member 57 is provided on the side of the sliding block 56 away from the fixed block 55. When the sliding block 56 and the fixed block 55 fit together, the mixture of water and air can push the sliding block 56 and the fixed block 55 to separate after passing through the spiral through hole 551, and be normally sprayed out from the nozzle 52. When the spraying of the mixture of water and air stops, the sliding block 56 and the fixed block 55 fit together again to prevent external asphalt from entering the inner cavity of the hollow cylinder 3, thereby forming a function similar to a one-way valve.

[0041] In order to install the elastic member 57, the inner diameters of the nozzle 52 and the accelerating tube 53 of the present application are smaller than the inner diameter of the outer shell 51. The elastic member 57 is a thrust spring, and the two ends of the elastic member 57 are respectively against the surface of the sliding block 56 and the inner wall of the end of the outer shell 51. Therefore, the elastic member 57 can be stably installed in the inner cavity of the outer shell 51 without falling off. A rubber sealing gasket is provided at the joint between the sliding block 56 and the fixed block 55 to increase the sealing between the two and prevent asphalt from infiltrating into the inner cavity of the hollow cylinder 3. A plurality of spiral through holes 551 are provided and distributed in a circular array, which can increase the injection flow rate of the mixture of water and air.

[0042] In order to fully disperse the mixture of water and air into the asphalt, the present application also has a connecting tube 54 fixedly sleeved on the outer side of the end of the accelerating tube 53, one end of the connecting tube 54 is fixedly connected with the hollow cylinder 3, the side wall of the protective cover 4 is provided with an oblique groove 44 for the nozzle 52 to pass through, and a rubber sealing gasket is provided at the joint between the inner wall of the oblique groove 44 and the surface of the nozzle 52, the end of the injection assembly 5 is kept flush with the outer side wall of the protective cover 4, and the nozzle 52 is connected to the nozzle 52. Figure 5 and Figure 4 As shown, the protective cover 4 can protect the injection assembly 5 to prevent the asphalt from wrapping around the outside of the injection assembly 5. Since the surface of the protective cover 4 is relatively smooth and flat, the viscosity of the asphalt is relatively small, so the protective cover 4 can rotate inside the asphalt. The inner wall of the acceleration tube 53 is fixedly provided with an auger-shaped guide plate 531, as shown in FIG. Figure 5As shown, when the mixture of water and air enters the inner cavity of the accelerating tube 53 from the inner cavity of the connecting tube 54, the flow rate of the mixture of water and air will be accelerated. At this time, it can form a vortex after being guided by the guide plate 531, thereby generating a strong impact force on the asphalt at the opening of the nozzle 52, ensuring that the mixture of water and air can be fully dispersed in the asphalt for timely foaming of the asphalt.

[0043] In order to preheat the mixture of water and air, the present application also has a sealing sleeve 41 fixedly arranged in the middle of the upper surface of the protective cover 4, and the sealing sleeve 41 is sleeved on the outer side of the hollow cylinder 3, so that a seal can be formed between the hollow cylinder 3 and the protective cover 4 to prevent asphalt from penetrating. The bottom of the hollow cylinder 3 and the bottom of the protective cover 4 are fixedly connected by connecting bolts 42. The bottom of the protective cover 4 is inlaid with an annular baffle 43, and the annular baffle 43 covers the end of the connecting bolt 42. Figure 3 As shown, the annular baffle 43 is used to protect the connecting bolt 42 to prevent the hexagonal screw hole at the end of the connecting bolt 42 from being blocked by asphalt, which makes it impossible for the hollow cylinder 3 and the protective cover 4 to be disassembled normally. A heat exchange cylinder 31 is fixedly installed in the middle of the inner cavity of the hollow cylinder 3. The heat exchange cylinder 31 itself is made of heat-conducting material. A heating rod 10 is penetrated through the bottom of the protective cover 4, and the upper end of the heating rod 10 is inserted into the inner cavity of the heat exchange cylinder 31. The upper end of the heating rod 10 penetrates the bottom of the protective cover 4 and the bottom of the hollow cylinder 3 in turn, and is inserted into the inner cavity of the heat exchange cylinder 31 to keep in contact with the heat exchange cylinder 31. The heating rod 10 is used to heat the heat exchange cylinder 31, so that the mixture of water and air entering the inner cavity of the hollow cylinder 3 can be preheated, and the mixture of water and air can be vaporized faster after being sprayed into the asphalt, so as to accelerate the foaming efficiency of the asphalt.

[0044] In order to separate the foamed asphalt from the molten asphalt, the present application also has a collecting ring 8 fixedly arranged in the middle of the inner wall of the foaming box 1. The inner wall of the collecting ring 8 is inclined and has a plurality of evenly distributed filtering holes 81. The inner diameter of the collecting ring 8 is larger than the outer diameter of the protective cover 4. The protective cover 4 can be removed from the upper end of the foaming box 1 without being hindered by the collecting ring 8. The interior of the collecting ring 8 is hollow, and the outer wall of the collecting ring 8 is fixedly connected to a discharge pipe 9. The setting of the collecting ring 8 is mainly used to collect the foamed asphalt. The asphalt in the molten In a molten state, it will accumulate at the bottom of the inner cavity of the foaming box 1. Only when the asphalt is foamed, its volume expands and rises to the position of the collecting ring 8. After passing through the filter hole 81, it can be collected in the inner cavity of the collecting ring 8 and finally discharged from the discharge pipe 9. In addition, the heating rod 10 is fixedly connected to the bottom of the foaming box 1. That is to say, the heating rod 10 of the device is fixed at the bottom of the foaming box 1. When the hollow cylinder 3 and the protective cover 4 are placed in the bottom of the inner cavity of the foaming box 1, the heating rod 10 can be inserted into the inner cavity of the heat exchange cylinder 31 to heat it.

[0045] In order to fully mix the water and the air, the present application also has a mixing chamber 6 disposed at the upper end of the hollow suspension shaft 2. The bottom of the mixing chamber 6 is rotatably connected to the hollow suspension shaft 2 through a rotating connector 63. The mixing chamber 6 itself does not rotate, and the hollow suspension shaft 2 can rotate below the mixing chamber 6. A water inlet pipe 61 and an air inlet pipe 62 are connected to both sides of the mixing chamber 6, respectively, for conveying water and air, respectively. The water inlet pipe 61 and the air inlet pipe 62 are symmetrically distributed around the mixing chamber 6, and the water inlet pipe 61 and the air inlet pipe 62 are both symmetrically distributed with respect to the mixing chamber 6. It is fixedly installed on the outside of the mixing chamber 6 in a tangential manner to the side, and a pressure relief valve 64 is fixedly installed on the top of the mixing chamber 6. Water and air are respectively transported to the inner cavity of the mixing chamber 6 through the water inlet pipe 61 and the air inlet pipe 62, and will form a vortex flow after entering the inner cavity of the mixing chamber 6 to improve the mixing degree of water and air. When the mixture of water and air passes through the inner cavity of the hollow suspension shaft 2, it is guided by the guide blades 21 and continues to maintain a vortex flow, thereby further improving the mixing effect. The setting of the pressure relief valve 64 is mainly used to relieve the pressure of the mixture of water and air.

[0046] In order to suspend and install the hollow suspension shaft 2, the present application also has two suspension frames 7 parallel to each other arranged on the outside of the mixing chamber 6, and a suspension ring 71 is fixedly connected between the lower ends of the two suspension frames 7. The suspension ring 71 is rotatably sleeved on the outside of the hollow suspension shaft 2, and a bearing 22 is installed between the two. The suspension frame 7 is mainly used to suspend the hollow suspension shaft 2 so that the hollow suspension shaft 2 itself can rotate, and the upper ends of the two suspension frames 7 are fixedly connected to the connecting beam plate 72, and the connecting beam plate 72 can be used for installation and connection with an external bracket to facilitate the positioning of the entire device.

[0047] The present invention also discloses a method for using the foamed asphalt generating device, which specifically comprises the following steps:

[0048] Step 1: Place the hollow cylinder 3 and the protective cover 4 at the lower end of the hollow suspension shaft 2 into the bottom of the inner cavity of the foaming box 1 from top to bottom, and make the heat exchange cylinder 31 movably sleeved on the outer side of the upper end of the heating rod 10;

[0049] Step 2: Water and air are introduced into the inner cavity of the mixing chamber 6 through the water inlet pipe 61 and the air inlet pipe 62 respectively for mixing. The mixture of water and air is transported to the inner cavity of the hollow cylinder 3 through the hollow suspension shaft 2, and is sprayed into the molten asphalt outside the protective cover 4 after passing through the spray assembly 5. The reaction force generated by the spray assembly 5 on the protective cover 4 drives the protective cover 4 to rotate, thereby uniformly spraying the mixture of water and air into the surrounding molten asphalt.

[0050] Step three, after the molten asphalt gradually foams, the viscosity of the asphalt on the protective cover 4 decreases, the rotation speed of the protective cover 4 increases, and the guide vanes 21 on the inner wall of the hollow suspension shaft 2 rotate to increase the resistance of the water and air mixture flowing from top to bottom in the inner cavity of the hollow suspension shaft 2. The flow rate of the water and air mixture sprayed by the injection assembly 5 decreases, and the rotation speed of the protective cover 4 slows down until it reaches stability.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A foamed asphalt generating device, characterized in that: include: A foaming box (1), wherein a hollow suspension shaft (2) is inserted into the inner cavity of the foaming box (1) from top to bottom, a hollow cylinder (3) is fixedly connected to the lower end of the hollow suspension shaft (2), a mixture of water and air flowing from top to bottom is passed through the inner cavity of the hollow suspension shaft (2), a spiral guide blade (21) is fixedly provided on the inner wall of the hollow suspension shaft (2), the blade width of the guide blade (21) is smaller than the radius of the hollow suspension shaft (2), and when the hollow suspension shaft (2) rotates, the guide blade (21) drives the water and air to have a tendency to flow from bottom to top; A protective cover (4), the protective cover (4) being sleeved on the outside of the hollow cylinder (3) and fixedly connected to the hollow cylinder (3), a plurality of injection assemblies (5) distributed in a ring array being arranged between the protective cover (4) and the hollow cylinder (3), the injection assemblies (5) themselves being arc-shaped and inclined, one end of the injection assemblies (5) penetrating the inner wall of the protective cover (4), and the other end of the injection assemblies (5) being connected to the inner cavity of the hollow cylinder (3); The injection assembly (5) comprises an outer shell (51), the two ends of the outer shell (51) are respectively provided with a nozzle (52) and an accelerating tube (53), a fixed block (55) is fixedly connected to the middle of the inner cavity of the outer shell (51), and a spiral through hole (551) is penetrated through the edge of the surface of the fixed block (55), a sliding block (56) is slidably mounted on one end of the inner cavity of the outer shell (51), a central through hole (561) is penetrated through the center of the surface of the sliding block (56), and the central through hole (561) and the spiral through hole (551) are mutually offset, and an elastic member (57) is provided on the side of the sliding block (56) away from the fixed block (55).

2. A foamed asphalt generating device according to claim 1, characterized in that: The inner diameters of the nozzle (52) and the accelerating tube (53) are both smaller than the inner diameter of the outer shell (51); the elastic member (57) is a thrust spring, and the two ends of the elastic member (57) respectively abut against the surface of the sliding block (56) and the inner wall of the end of the outer shell (51); a sealing gasket made of a rubber material is provided at the joint between the sliding block (56) and the fixed block (55); and a plurality of spiral through holes (551) are provided and distributed in a ring array.

3. A foamed asphalt generating device according to claim 2, characterized in that: A connecting pipe (54) is fixedly sleeved on the outer side of the end of the accelerating tube (53), one end of the connecting pipe (54) being fixedly connected to the hollow cylinder (3), a side wall of the protective cover (4) being provided with an oblique slot (44) for the nozzle (52) to pass through, and a sealing gasket made of rubber material is provided at the joint between the inner wall of the oblique slot (44) and the surface of the nozzle (52), the end of the injection assembly (5) is kept flush with the outer side wall of the protective cover (4), and an auger-shaped guide plate (531) is fixedly provided on the inner wall of the accelerating tube (53).

4. A foamed asphalt generating device according to claim 3, characterized in that: A sealing sleeve (41) is fixedly arranged in the middle of the upper surface of the protective cover (4), and the sealing sleeve (41) is sleeved on the outside of the hollow cylinder (3). The bottom of the hollow cylinder (3) and the bottom of the protective cover (4) are fixedly connected via connecting bolts (42). An annular baffle (43) is inlaid in the bottom of the protective cover (4), and the annular baffle (43) covers the end of the connecting bolt (42). A heat exchange cylinder (31) is fixedly installed in the middle of the inner cavity of the hollow cylinder (3). A heating rod (10) is penetrated through the bottom of the protective cover (4), and the upper end of the heating rod (10) is plugged into the inner cavity of the heat exchange cylinder (31).

5. A foamed asphalt generating device according to claim 4, characterized in that: A collecting ring (8) is fixedly arranged in the middle of the inner wall of the foaming box (1); the inner wall of the collecting ring (8) is inclined and has a plurality of evenly distributed filtering holes (81); the inner diameter of the collecting ring (8) is larger than the outer diameter of the protective cover (4); the interior of the collecting ring (8) is hollow; and the outer wall of the collecting ring (8) is fixedly connected to a discharge pipe (9); and the heating rod (10) is fixedly connected to the bottom of the foaming box (1).

6. A foamed asphalt generating device according to claim 5, characterized in that: A mixing chamber (6) is provided at the upper end of the hollow suspension shaft (2); the bottom of the mixing chamber (6) is rotatably connected to the hollow suspension shaft (2) via a rotary connector (63); a water inlet pipe (61) and an air inlet pipe (62) are respectively connected to the two sides of the mixing chamber (6); the water inlet pipe (61) and the air inlet pipe (62) are symmetrically distributed around the mixing chamber (6); the water inlet pipe (61) and the air inlet pipe (62) are fixedly mounted on the outside of the mixing chamber (6) in a manner that they are tangent to the side of the mixing chamber (6); and a pressure relief valve (64) is fixedly mounted on the top of the mixing chamber (6).

7. A foamed asphalt generating device according to claim 6, characterized in that: Two mutually parallel suspension frames (7) are arranged on the outside of the mixing chamber (6); a suspension collar (71) is fixedly connected between the lower ends of the two suspension frames (7); the suspension collar (71) is rotatably sleeved on the outside of the hollow suspension shaft (2), and a bearing (22) is installed between the two; and the upper ends of the two suspension frames (7) are fixedly connected to the connecting beam plate (72).

8. A method for using the foamed asphalt generating device according to claim 7, characterized in that: The specific steps include: Step 1: Place the hollow cylinder (3) and the protective cover (4) at the lower end of the hollow suspension shaft (2) from top to bottom into the bottom of the inner cavity of the foaming box (1), and allow the heat exchange cylinder (31) to be movably sleeved on the outer side of the upper end of the heating rod (10); Step 2: water and air are introduced into the inner cavity of the mixing chamber (6) through the water inlet pipe (61) and the air inlet pipe (62) respectively for mixing; the mixture of water and air is transported to the inner cavity of the hollow cylinder (3) through the hollow suspension shaft (2) and sprayed into the molten asphalt outside the protective cover (4) after passing through the spray assembly (5); the reaction force generated on the protective cover (4) when the water and air are sprayed through the spray assembly (5) drives the protective cover (4) to rotate, thereby spraying the mixture of water and air evenly into the surrounding molten asphalt; Step 3: After the molten asphalt gradually foams, the viscosity of the asphalt on the protective cover (4) decreases, the rotation speed of the protective cover (4) increases, and the guide vanes (21) on the inner wall of the hollow suspension shaft (2) rotate to increase the resistance of the water and air mixture flowing from top to bottom in the inner cavity of the hollow suspension shaft (2). The flow rate of the water and air mixture sprayed by the spray assembly (5) decreases, and the rotation speed of the protective cover (4) slows down until it reaches stability.

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