A preventive maintenance structure for highway asphalt pavement

Abstract

This invention discloses a preventive maintenance structure for asphalt pavement, relating to the field of pavement cleaning technology. It includes a frame, a storage hopper located on one side of the frame for storing shot required for pavement cleaning, a cooling mechanism located on one side of the frame for cooling the shot, a shot blasting mechanism located on one side of the frame for blasting the shot to treat the pavement, and a separation mechanism located on one side of the frame for recovering and separating the shot and dust. This preventive maintenance structure for asphalt pavement, by incorporating a cooling mechanism, utilizes a refrigerant to absorb heat and cool the shot during its circulation path, effectively suppressing temperature rise and maintaining its hardness and impact resistance. Simultaneously, it prevents high-temperature shot from embedding into the softened pavement, thus solving the problem of decreased cleaning effectiveness due to temperature increases during shot circulation and enabling continuous operation, thereby improving maintenance efficiency.

Description

Technical Field

[0001] This invention relates to the field of road surface cleaning technology, specifically to a preventive maintenance structure for highway asphalt pavement. Background Technology

[0002] Preventive maintenance of asphalt pavement refers to maintenance measures taken before the pavement has been significantly damaged or has only minor defects, in order to prevent the spread of defects and delay the decline of pavement performance without disturbing the pavement structure or changing the strength of the pavement structure. Shot blasting is an important technical means, which cleans the pavement surface and increases the micro-texture by high-speed shot blasting, which can effectively improve the anti-skid performance of the pavement.

[0003] Chinese invention patent CN110385651B discloses a shot blasting machine equipped with a fan unit connected to a separation chamber. The separation chamber separates dust from the shot stream, improving the dust separation effect. The cross-sectional area of ​​the rebound chamber gradually decreases from bottom to top.

[0004] This causes the airflow generated by the external dust collector and the built-in fan of the shot blasting machine to gradually increase in speed within the rebound chamber. This overcomes the speed reduction caused by the weight of the rebounding shot within the rebound chamber, ensuring that all the rebounding shot can enter the separation chamber and not fall back to the ground.

[0005] Existing shot blasting equipment still has shortcomings in actual use. The frictional heat generated by the repeated impact of the shot on the road surface causes its temperature to rise continuously. On the one hand, the hardness of the high-temperature shot decreases and the impact force weakens, making it easy to stick together. On the other hand, when impacting the softened asphalt road surface, it is easy to embed into the surface layer, affecting the cleaning effect. Summary of the Invention

[0006] The purpose of this invention is to provide a preventive maintenance structure for highway asphalt pavement to solve the problems of reduced cleaning effect caused by the recycling of shot and the rise in its own temperature in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a preventive maintenance structure for highway asphalt pavement, comprising a frame, and further comprising:

[0008] A storage hopper, located on one side of the frame, is used to store the shot required for road cleaning.

[0009] A cooling mechanism, located on one side of the frame, is used to cool the shot.

[0010] A shot blasting mechanism, which is located on one side of the frame, is used to blast shot to treat the road surface;

[0011] A separation mechanism, located on one side of the frame, is used to recover and separate the pellets and dust.

[0012] The cooling mechanism includes a feeding pipe, the input end of which is fixedly connected to the storage hopper and communicates with the inside of the storage hopper. A spiral shaft is rotatably installed on the inner wall of the feeding pipe, and spiral blades are fixedly installed on the outer side of the spiral shaft. One end of the spiral shaft that is rotatably connected to the feeding pipe passes through and extends to the outside of the feeding pipe. Several vent holes are provided on the outside of the feeding pipe.

[0013] The cooling mechanism also includes a cooling drive source, which is mounted on one side of the frame via a bracket, and its output end drives the spiral shaft to rotate via gear transmission.

[0014] The cooling mechanism also includes a refrigerant hopper, which is mounted on one side of the frame via a bracket, and the refrigerant hopper is connected to the feeding pipe via a conduit.

[0015] Furthermore, a stirring shaft is rotatably mounted on the inner wall of the storage hopper, one end of which passes through and extends to the outside of the storage hopper. A stirring drive source is provided on the top of the frame, and the stirring drive source drives the stirring shaft to rotate via belt drive.

[0016] Furthermore, the shot blasting mechanism includes several hydraulic cylinders, which are rotatably mounted on one side of the frame, and a support plate is rotatably mounted on the output end of each hydraulic cylinder.

[0017] Furthermore, the shot blasting mechanism also includes a distribution hopper, which is disposed on one side of the frame and is fixedly connected to the output end of the feeding pipe. The distribution hopper is connected to the feeding pipe, and a plurality of shot blasting components are disposed on one side of the distribution hopper.

[0018] Furthermore, the shot blasting assembly includes a shot blasting chamber rotatably mounted inside the frame. An adjustable pipe is provided on one side of the shot blasting chamber and is connected to the distribution hopper through the adjustable pipe. A shot distribution wheel is rotatably mounted on one side of the shot blasting chamber, and an impeller is rotatably mounted on its inner wall. The shot distribution wheel and the impeller are fixedly connected. A plurality of shot blasting holes are opened through the outer side of the shot distribution wheel. A plurality of blades are provided on the outer side of the impeller, and the blades are spaced to correspond to the shot blasting holes. A directional sleeve is fixedly mounted on the inner wall of the shot blasting chamber. The directional sleeve is located between the shot distribution wheel and the blades, and its bottom is provided with an opening.

[0019] The shot blasting assembly also includes a shot blasting drive source, which is disposed on one side of the pallet and drives the shot distribution wheel and the impeller to rotate via belt drive.

[0020] Furthermore, the separation mechanism includes a recovery pipe disposed on one side of the frame, a flow guide shroud disposed on the top of the recovery pipe, and a flow divider disposed on the inner wall of the flow guide shroud.

[0021] Furthermore, the separation mechanism also includes a separation chamber located on the top of the frame. A dust removal pipe is provided on one side of the separation chamber, an air outlet baffle is fixedly installed on its inner wall, and a mesh screen is provided at the bottom of its inner wall.

[0022] The dust removal pipe is connected to the separation chamber, the flow guide is located in the inner cavity of the separation chamber, and the bottom of the separation chamber is fixedly connected to the storage hopper.

[0023] Furthermore, the bottom of the frame is equipped with several casters.

[0024] Compared with the prior art, the present invention provides a preventive maintenance structure for asphalt pavement of highways. By setting a cooling mechanism, the shot is cooled by the heat absorption of the refrigerant in the shot circulation path, which effectively suppresses the temperature rise of the shot, maintains its hardness and impact force, and avoids the high temperature shot from embedding into the softened pavement. This solves the problem of reduced cleaning effect caused by temperature rise during shot circulation, and enables continuous operation, improving maintenance efficiency. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0026] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the rack structure provided in an embodiment of the present invention;

[0028] Figure 3 This is a first schematic diagram of a partial structure provided in an embodiment of the present invention;

[0029] Figure 4 This is a first cross-sectional view of a partial structure provided in an embodiment of the present invention;

[0030] Figure 5 This is a second cross-sectional view of a portion of the structure provided in an embodiment of the present invention;

[0031] Figure 6 This is a third cross-sectional view of a partial structure provided in an embodiment of the present invention;

[0032] Figure 7 This is a second schematic diagram of a partial structure provided in an embodiment of the present invention;

[0033] Figure 8 This is a fourth cross-sectional view of a partial structure provided in an embodiment of the present invention;

[0034] Figure 9 This is a fifth cross-sectional view of a partial structure provided in an embodiment of the present invention;

[0035] Figure 10 This is a sixth cross-sectional view of a partial structure provided in an embodiment of the present invention;

[0036] Figure 11 This is a seventh cross-sectional view of a partial structure provided in an embodiment of the present invention;

[0037] Figure 12 This is an eighth cross-sectional view of a partial structure provided in an embodiment of the present invention;

[0038] Figure 13 This is a ninth cross-sectional view of a partial structure provided in an embodiment of the present invention;

[0039] Figure 14 This is a tenth cross-sectional view of a partial structure provided in an embodiment of the present invention;

[0040] Figure 15 This is a third schematic diagram of a partial structure provided in an embodiment of the present invention;

[0041] Figure 16 The eleventh cross-sectional view is provided for a partial structure according to an embodiment of the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Frame; 2. Storage hopper; 21. Agitator shaft; 22. Agitator drive source; 3. Cooling mechanism; 31. Feeding pipe; 32. Spiral shaft; 33. Spiral blades; 34. Cooling drive source; 35. Refrigerant hopper; 36. Vent; 4. Shot blasting mechanism; 41. Hydraulic cylinder; 42. Support plate; 43. Distribution hopper; 44. Shot blasting assembly; 441. Shot blasting chamber; 442. Adjustable pipe; 443. Shot distribution wheel; 444. Impeller; 445. Blades; 446. Orientation sleeve; 447. Shot blasting drive source; 5. Separation mechanism; 51. Recovery pipe; 52. Flow guide; 53. Diverter plate; 54. Separation chamber; 55. Dust removal pipe; 56. Air outlet baffle; 57. Grid screen; 6. Casters. Detailed Implementation

[0044] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0045] Example 1:

[0046] As attached Figure 1 To be continued Figure 6As shown:

[0047] This invention provides a preventive maintenance structure for highway asphalt pavement, including a frame 1, and further comprising:

[0048] The storage hopper 2, located on one side of the frame 1, is used to store the shot required for road cleaning.

[0049] Cooling mechanism 3, which is located on one side of frame 1, is used to cool the shot material;

[0050] The shot blasting mechanism 4 is located on one side of the frame 1 and is used to blast shot to treat the road surface;

[0051] Separation mechanism 5, which is located on one side of frame 1, is used to recover and separate the shot and dust;

[0052] The cooling mechanism 3 includes a feeding pipe 31, whose input end is fixedly connected to the storage hopper 2 and is connected to the inside of the storage hopper 2. A spiral shaft 32 is rotatably installed on the inner wall of the feeding pipe 31, and a spiral blade 33 is fixedly installed on the outer side of the spiral shaft 32. One end of the spiral shaft 32 rotatably connected to the feeding pipe 31 passes through and extends to the outer side of the feeding pipe 31. Several vent holes 36 are provided on the outer side of the feeding pipe 31.

[0053] The cooling mechanism 3 also includes a cooling drive source 34, which is mounted on one side of the frame 1 via a bracket, and its output end drives the spiral shaft 32 to rotate via gear transmission.

[0054] The cooling mechanism 3 also includes a refrigerant hopper 35, which is mounted on one side of the frame 1 via a bracket. The refrigerant hopper 35 is connected to the feeding pipe 31 via a conduit.

[0055] Detailed implementation: The frame 1 adopts a frame structure welded from steel profiles. The storage hopper 2 is fixed on one side of the frame 1. The storage hopper 2 is funnel-shaped with a larger top and a smaller bottom. Before use, the shot material that is compatible with the road surface is poured into the storage hopper 2. After the equipment is started, the shot material enters the feeding pipe 31 below the storage hopper 2. The cooling drive source 34 drives the spiral shaft 32 and spiral blades 33 to rotate through gear transmission. With the help of gravity, the shot material rolls downward.

[0056] The user adds refrigerant to the refrigerant hopper 35. The refrigerant includes, but is not limited to, dry ice particles. The dry ice particles enter the feed pipe 31 through the conduit and are fully tumbled and mixed with the pellets. The dry ice particles sublimate and absorb heat, thus cooling the pellets. At the same time, the air pressure inside the feed pipe 31 increases, and gaseous carbon dioxide is discharged through the vent 36.

[0057] The cooling drive source 34 includes, but is not limited to, a motor, which is electrically connected to an external power supply and is also controlled by an external PLC programming program. A protective cover is provided outside the gear transmission part to prevent flying stones, dust and other objects from interfering with the operation. The ventilation hole 36 adopts a combination of opening and fixing the screen. The screen can be selected from the Huafeng brand PT20 model.

[0058] Due to different working environments, the initial temperature of the shot is also different. However, the increase in temperature will reduce the hardness of the shot and thus reduce the impact force. Therefore, it is beneficial to reduce the temperature of the shot as much as possible within a certain range to ensure the working effect. In addition, the reduction of the shot temperature can carry away the heat of the ground when it hits the ground, causing the asphalt to harden and improve the impact effect.

[0059] After being cooled, the shot is blasted by the shot blasting mechanism 4 and impacts the ground. It is then collected and separated by the separation mechanism 5 and enters the storage hopper 2 again. At this time, due to multiple impacts, the temperature of the shot rises, making cooling necessary.

[0060] To further improve the process, the pellets can be re-entered into the feeding pipe 31 and the above cooling treatment can be repeated.

[0061] A stirring shaft 21 is rotatably installed on the inner wall of the storage hopper 2. One end of the stirring shaft 21 passes through and extends to the outside of the storage hopper 2. A stirring drive source 22 is provided on the top of the frame 1. The stirring drive source 22 drives the stirring shaft 21 to rotate through belt drive.

[0062] Specific implementation method: After multiple impacts, the shot material with increased temperature enters the storage hopper 2 again. The stirring drive source 22 drives the stirring shaft 21 to rotate through belt drive, so that the shot material with different temperature and different wear degree is fully mixed, reducing the temperature of the shot material and ensuring the impact effect. Compared with shot blasting machines that lack shot material cooling treatment, which need to stop for centralized cooling after working for a period of time, the work efficiency is greatly improved.

[0063] The stirring drive source 22 includes, but is not limited to, a motor, which is electrically connected to an external power supply and is also controlled by an external PLC programming program. A protective cover is provided outside the belt drive part to prevent flying stones, dust and other objects from interfering with the operation.

[0064] The bottom of the frame 1 is equipped with several casters 6.

[0065] Detailed implementation: Users can move the device flexibly by means of manual or mechanical traction, with the help of the moving wheels 6.

[0066] Working principle: Before operation, the pellets are loaded into storage hopper 2, and dry ice granules are loaded into refrigerant hopper 35. After starting the equipment, the stirring drive source 22 drives the stirring shaft 21 to rotate via belt drive, so that the pellets in storage hopper 2 are evenly mixed. At the same time, stirring can prevent the heated pellets from sticking together or clumping with impurities. The pellets fall into the feeding pipe 31 under the action of gravity. The cooling drive source 34 drives the spiral shaft 32 and spiral blades 33 to rotate via gear drive, pushing the pellets to roll forward along the feeding pipe 31. At the same time, the refrigerant... Dry ice particles in hopper 35 enter feed pipe 31 through conduit, mix thoroughly with shot, and rapidly sublimate, absorbing heat from the shot to achieve cooling. The generated carbon dioxide gas is discharged through vent 36, while the shot is blocked by screen and continues to be conveyed forward. The cooled shot enters shot blasting mechanism 4 and is propelled at high speed onto the road surface to complete the cleaning operation. The impacted shot and dust are recovered by separation mechanism 5, and the separated shot falls back into storage hopper 2 to enter the next cycle, thus realizing online continuous cooling and recycling of shot.

[0067] Example 2:

[0068] As attached Figure 1 To be continued Figure 2 , attached Figure 7 To be continued Figure 14 As shown:

[0069] This embodiment is basically the same as the previous embodiment, except that the shot blasting mechanism 4 includes several hydraulic cylinders 41, which are rotatably mounted on one side of the frame 1, and the output end of the hydraulic cylinder 41 is rotatably mounted with a support plate 42.

[0070] The shot blasting mechanism 4 also includes a material distribution hopper 43, which is located on one side of the frame 1 and is fixedly connected to the output end of the feeding pipe 31. The material distribution hopper 43 is connected to the feeding pipe 31, and a number of shot blasting components 44 are provided on one side of the material distribution hopper 43.

[0071] The shot blasting assembly 44 includes a shot blasting chamber 441, which is rotatably mounted inside the frame 1. An adjustable pipe 442 is provided on one side of the shot blasting chamber 441 and is connected to the distribution hopper 43 through the adjustable pipe 442. A shot distribution wheel 443 is rotatably mounted on one side of the shot blasting chamber 441, and an impeller 444 is rotatably mounted on its inner wall. The shot distribution wheel 443 and the impeller 444 are fixedly connected. Several shot blasting holes are opened through the outer side of the shot distribution wheel 443. Several blades 445 are provided on the outer side of the impeller 444. The blades 445 are spaced and correspond to the shot blasting holes. A directional sleeve 446 is fixedly mounted on the inner wall of the shot blasting chamber 441. The directional sleeve 446 is located between the shot distribution wheel 443 and the blades 445, and has an opening at its bottom.

[0072] The shot blasting assembly 44 also includes a shot blasting drive source 447, which is located on one side of the support plate 42 and drives the shot distribution wheel 443 and the impeller 444 to rotate via belt drive.

[0073] Detailed implementation: In order to increase the width of a single operation and improve construction efficiency, multiple shot blasting components 44 are set up. The bottom of the distribution hopper 43 is provided with an opening corresponding to the shot blasting component 44. The distribution hopper 43 is provided with partitions of the same spacing. The parts separated by the partitions are funnel-shaped with a larger top and a smaller bottom. The shot that has been cooled flows into the distribution hopper 43 from the feeding pipe 31 and enters the adjustable pipe 442 of the corresponding shot blasting component 44 evenly under the diversion effect of the partition.

[0074] The cooled shot enters the shot blasting chamber 441 from the distribution hopper 43 through the adjustable pipe 442 and falls into the shot distribution wheel 443. The bottom of the shot blasting chamber 441 has an outlet. The shot blasting drive source 447 drives the shot distribution wheel 443 and impeller 444 to rotate through the belt, which in turn drives the blades 445 to rotate. The shot is quantitatively distributed to the opening of the directional sleeve 446 through the shot blasting hole, and then enters the root of the blades 445. Under the action of centrifugal force, it accelerates along the blades 445 and is thrown out at high speed from the outlet of the shot blasting chamber 441, impacting the road surface. The adjustable pipe 442 is a flexible hose, including but not limited to rubber material, which can be bent and twisted. The shot blasting drive source 447 includes but is not limited to a motor, which is electrically connected to an external power supply and is also controlled by an external PLC programming program.

[0075] As the shot wheel 443, impeller 444 and blade 445 rotate at high speed, negative pressure is generated inside the shot blasting chamber 441. Carbon dioxide that is not discharged in time from the feed pipe 31 is drawn in and escapes from the opening of the shot blasting chamber 441 along with the shot.

[0076] Depending on the type of road surface defects and working conditions, the angle of the shot impact on the road surface needs to be adjusted in a timely manner. When adjusting the angle, the user activates the hydraulic cylinder 41 to extend and retract, which drives the pallet 42 to adjust the angle. The pallet 42 drives the shot blasting drive source 447, which is fixedly connected to it, to adjust. The belt drive structure of the shot blasting drive source 447 is equipped with a protective cover to prevent flying stones, dust and other objects from interfering with the operation. At the same time, one side of the protective cover is fixedly connected to the pallet 42 and the other side is fixedly connected to the shot blasting chamber 441. Therefore, the adjustment of the pallet 42 will also drive the shot blasting assembly 44 to adjust, so that the outlet of the shot blasting chamber 441 faces the ground at different angles.

[0077] Working principle: During operation, the cooled shot flows from the feed pipe 31 into the distribution hopper 43. Under the diversion effect of the baffle, it enters evenly into the adjustable pipes 442 of each shot blasting assembly 44, and then falls into the shot distribution wheel 443 in the shot blasting chamber 441. The shot blasting drive source 447 drives the shot distribution wheel 443 and impeller 444 to rotate at high speed via a belt. The shot is quantitatively distributed through the shot blasting holes of the shot distribution wheel 443 to the opening of the directional sleeve 446, and then enters the root of the blade 445. Under the action of centrifugal force, it accelerates along the blade 445 and is ejected at high speed from the outlet of the shot blasting chamber 441. When impacting the road surface, multiple shot blasting components 44 work simultaneously, effectively increasing the width of a single operation and improving construction efficiency. The high-speed rotation of the shot wheel 443, impeller 444, and blades 445 creates negative pressure inside the shot blasting chamber 441, which can draw in residual carbon dioxide gas in the feed pipe 31 and discharge it along with the shot, thus assisting in cooling the road surface. When it is necessary to adjust the impact angle of the shot, the hydraulic cylinder 41 is activated to extend and retract, driving the support plate 42 to rotate the entire shot blasting component 44, thereby changing the angle between the outlet of the shot blasting chamber 441 and the road surface to adapt to the cleaning needs of different defects.

[0078] Example 3:

[0079] As attached Figure 1 To be continued Figure 2 , attached Figure 15 To be continued Figure 16 As shown:

[0080] This embodiment is basically the same as Embodiments 1 and 2, except that the separation mechanism 5 includes a recovery pipe 51, which is disposed on one side of the frame 1. A flow guide 52 is provided on the top of the recovery pipe 51, and a flow divider 53 is provided on the inner wall of the flow guide 52.

[0081] Specific implementation method: The lower end of the recovery pipe 51 is open, and the opening is directly opposite the working area of ​​the shot blasting mechanism 4. It is used to recover the shot material scattered after blasting and the road dust that has been peeled off. The top of the recovery pipe 51 is fixedly connected to the guide hood 52. The inner wall of the guide hood 52 is provided with a flow divider 53. The flow divider 53 is arranged at an angle to change the movement direction of the mixture.

[0082] The separation mechanism 5 also includes a separation chamber 54, which is located on the top of the frame 1. A dust removal pipe 55 is provided on one side of the separation chamber 54, an air outlet baffle 56 is fixedly installed on its inner wall, and a mesh screen 57 is provided at the bottom of its inner wall.

[0083] The dust removal pipe 55 is connected to the separation chamber 54, the flow guide hood 52 is located in the inner cavity of the separation chamber 54, and the bottom of the separation chamber 54 is fixedly connected to the storage hopper 2.

[0084] Detailed implementation: The guide hood 52 is located inside the separation chamber 54. The air outlet baffle 56 is used to guide the airflow path and cause dust to settle. The mesh screen 57 is used to intercept larger particles of impurities. The dust removal pipe 55 is connected to the separation chamber 54. The bottom of the separation chamber 54 is fixedly connected to the storage hopper 2 and they are interconnected, so that the separated pellets can fall directly into the storage hopper 2 by gravity.

[0085] Working principle: During operation, the external dust removal system generates negative pressure at the outlet of the dust removal pipe 55. The dust removal system includes, but is not limited to, a fan, which creates suction at the lower end of the recovery pipe 51. After the shot blasting mechanism 4 blasts the shot and impacts the road surface, the mixture of shot and dust is drawn into the guide hood 52 through the recovery pipe 51 under the action of negative pressure. The mixture first impacts the diversion plate 53. Under the impact, the shot and impurities with larger mass fall directly to the bottom of the separation chamber 54 due to their large inertia and fast settling speed. The mesh screen 57 screens out the shot, which enters the storage hopper 2. The impurities remain above the mesh screen 57. The airflow containing fine dust bypasses the diversion plate 53 and continues to rise. After being slowed down by the outlet baffle 56, it enters the dust removal pipe 55. The outlet baffle 56 slows down the airflow and at the same time blocks the shot with a large initial velocity that is escaping, causing it to settle.

[0086] Finally, air and dust are discharged through dust removal pipe 55, larger impurities are collected on top of mesh screen 57, and the shot is returned to storage hopper 2 for reuse. Thus, the shot is efficiently recovered and recycled, while the dust is separated and discharged, achieving dust-free operation.

[0087] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A preventive maintenance structure for highway asphalt pavement, comprising a frame (1), characterized in that, Also includes: A storage hopper (2), which is located on one side of the frame (1), is used to store the shot required for road cleaning; Cooling mechanism (3), which is located on one side of the frame (1), is used to cool the pellets; A shot blasting mechanism (4) is located on one side of the frame (1) and is used to blast shot to treat the road surface; A separation mechanism (5), which is located on one side of the frame (1), is used to recover and separate the pellets and dust; The cooling mechanism (3) includes a feeding pipe (31), the input end of which is fixedly connected to the storage hopper (2) and communicates with the inside of the storage hopper (2). A spiral shaft (32) is rotatably installed on the inner wall of the feeding pipe (31), and a spiral blade (33) is fixedly installed on the outer side of the spiral shaft (32). One end of the spiral shaft (32) rotatably connected to the feeding pipe (31) passes through and extends to the outer side of the feeding pipe (31). Several ventilation holes (36) are provided on the outer side of the feeding pipe (31). The cooling mechanism (3) also includes a cooling drive source (34), which is mounted on one side of the frame (1) via a bracket, and its output end drives the spiral shaft (32) to rotate via gear transmission; The cooling mechanism (3) also includes a refrigerant hopper (35), which is mounted on one side of the frame (1) via a bracket. The refrigerant hopper (35) is connected to the feeding pipe (31) via a conduit.

2. The preventive maintenance structure for highway asphalt pavement according to claim 1, characterized in that, A stirring shaft (21) is rotatably mounted on the inner wall of the storage hopper (2). One end of the stirring shaft (21) passes through and extends to the outside of the storage hopper (2). A stirring drive source (22) is provided on the top of the frame (1). The stirring drive source (22) drives the stirring shaft (21) to rotate through belt drive.

3. The preventive maintenance structure for highway asphalt pavement according to claim 1, characterized in that, The shot blasting mechanism (4) includes several hydraulic cylinders (41), which are rotatably mounted on one side of the frame (1), and the output end of the hydraulic cylinder (41) is rotatably mounted with a support plate (42).

4. The preventive maintenance structure for highway asphalt pavement according to claim 3, characterized in that, The shot blasting mechanism (4) also includes a material distribution hopper (43), which is located on one side of the frame (1) and is fixedly connected to the output end of the feeding pipe (31). The material distribution hopper (43) is connected to the feeding pipe (31), and a plurality of shot blasting components (44) are provided on one side of the material distribution hopper (43).

5. The preventive maintenance structure for highway asphalt pavement according to claim 4, characterized in that, The shot blasting assembly (44) includes a shot blasting chamber (441), which is rotatably mounted inside the frame (1). An adjustable pipe (442) is provided on one side of the shot blasting chamber (441), and it is connected to the distribution hopper (43) through the adjustable pipe (442). A shot distribution wheel (443) is rotatably mounted on one side of the shot blasting chamber (441), and an impeller (444) is rotatably mounted on its inner wall. The shot distribution wheel (443) and the impeller (444) are fixedly connected. A plurality of shot blasting holes are opened through the outer side of the shot distribution wheel (443). A plurality of blades (445) are provided on the outer side of the impeller (444). The blades (445) are spaced and correspond to the shot blasting holes. A directional sleeve (446) is fixedly mounted on the inner wall of the shot blasting chamber (441). The directional sleeve (446) is located between the shot distribution wheel (443) and the blades (445), and it has an opening at its bottom. The shot blasting assembly (44) also includes a shot blasting drive source (447), which is disposed on one side of the pallet (42) and drives the shot distribution wheel (443) and the impeller (444) to rotate via belt drive.

6. The preventive maintenance structure for highway asphalt pavement according to claim 1, characterized in that, The separation mechanism (5) includes a recovery pipe (51) which is disposed on one side of the frame (1). A flow guide (52) is provided on the top of the recovery pipe (51), and a flow divider (53) is provided on the inner wall of the flow guide (52).

7. The preventive maintenance structure for highway asphalt pavement according to claim 6, characterized in that, The separation mechanism (5) also includes a separation chamber (54), which is located on the top of the frame (1). A dust removal pipe (55) is provided on one side of the separation chamber (54), an air outlet baffle (56) is fixedly installed on its inner wall, and a mesh screen (57) is provided at the bottom of its inner wall. The dust removal pipe (55) is connected to the separation chamber (54), the flow guide hood (52) is located in the inner cavity of the separation chamber (54), and the bottom of the separation chamber (54) is fixedly connected to the storage hopper (2).

8. A preventive maintenance structure for highway asphalt pavement according to any one of claims 1, 2, 5 or 7, characterized in that, The bottom of the frame (1) is provided with several casters (6).

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