Miniature unmanned road nursing device

Abstract

The miniature unmanned road maintenance device comprises a locomotive body, an unmanned control module is fixed to the left side of the locomotive body, an asphalt storage tank and two asphalt recycling boxes are fixed to the locomotive body, and an asphalt spraying device is arranged on the rear side of the asphalt storage tank; the power box of the asphalt spraying device is used for driving the asphalt spray head and the asphalt foaming spray head to reciprocate, so that uniform asphalt spraying is ensured; the waste asphalt is recycled, so that the consumption of asphalt and asphalt aggregate raw materials is reduced, and the maintenance cost of the road maintenance is reduced; when the waste asphalt is subjected to foaming treatment, the air cylinder drives the push plate to move up and down in a reciprocating manner, so that not only is the function of preventing the asphalt from being supplied into the foaming cavity achieved, but also the high-temperature liquid asphalt is prevented from blocking the discharging pipe; water flow generated by water pumping of the water pump and air flow generated by air pumping of the air pump are used for asphalt foaming, and generated impact force blows the asphalt into the foaming cavity, so that residual asphalt is cleaned.

Description

Technical Field

[0001] The invention belongs to the technical field of highway maintenance, and in particular relates to a miniature unmanned highway maintenance device. Background Art

[0002] With the rapid development of highway construction, highways have shifted from pursuing quantity to pursuing quality, and from the era of emergency repairs to the era of maintenance. Every year, about 10% of the road surface needs to be renovated and maintained. It is estimated that 160 million tons of old asphalt pavement materials are generated each year, while the recycling rate of highway pavement materials is less than 30%. If traditional maintenance methods are used, not only will the maintenance time be long and the operating efficiency be low, but a large amount of waste asphalt mixture will also be generated, which will waste resources, occupy land, and damage the natural environment. Therefore, seeking new technologies and new processes to recycle old materials has become an urgent problem to be solved in order to achieve cost savings and environmental protection.

[0003] The application of foamed asphalt technology provides a solution. The foamed asphalt foaming device is the carrier for the application and promotion of foamed asphalt cold regeneration technology. Foamed asphalt regeneration technology is a cold regeneration technology with foamed asphalt as a binder. That is, in the foamed asphalt generating equipment, high-temperature asphalt is mixed with cold water to produce fine foam, which makes the asphalt expand to form foamed asphalt, and then mixed with aggregate. The obtained foamed asphalt mixture is applied to the paving and maintenance of asphalt pavement.

[0004] Foamed asphalt cold recycling technology provides an excellent way to recycle asphalt pavement materials. It not only reduces environmental pollution, but also significantly improves economic and environmental benefits. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a miniature unmanned highway maintenance device to solve the above-mentioned problems.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a miniature unmanned highway maintenance device, comprising a locomotive body, an unmanned driving control module is fixed on the left side of the locomotive body, an asphalt storage tank and two asphalt recovery boxes are fixed on the body, wherein the asphalt recovery boxes are symmetrically distributed on the left and right sides of the asphalt storage tank, an asphalt spraying device is arranged on the rear side of the asphalt storage tank, a first mounting frame is arranged between the asphalt spraying device and the asphalt storage tank, one side of the first mounting frame is fixedly connected to the rear side of the asphalt storage tank, the asphalt spraying device comprises a power box, the power box is fixedly connected to the first mounting frame, and the lower side of the power box is symmetrically arranged A sliding panel is provided, the upper edge of the sliding panel is a T-shaped structure, two guide rails are provided on the lower side of the power box, the T-shaped structure on the upper edge of the sliding panel is slidably connected to the guide rail on the lower side of the power box, and a row of asphalt spray heads and a row of asphalt foaming spray heads are provided under the power box, a second mounting frame is fixed on the upper side of the asphalt spray heads and the asphalt foaming spray heads, the second mounting frames on the upper sides of the asphalt spray heads and the asphalt foaming spray heads are respectively fixedly connected to the sliding panel on the corresponding side, the nozzles of the asphalt spray heads and the asphalt foaming spray heads are vertically downward, wherein the asphalt spray heads are connected to the asphalt storage tank through an asphalt pipe, and the asphalt foaming spray heads are connected to the asphalt recovery tank through an asphalt pipe.

[0007] A partition is provided inside the power box, which divides the inside of the power box into an upper cavity and a lower cavity. A driving motor is fixed in the upper cavity of the power box, and the output shaft of the driving motor is inserted into the lower cavity of the power box. A first transmission shaft, a second transmission shaft and a third transmission shaft are provided in the lower cavity of the power box. The first transmission shaft, the second transmission shaft and the third transmission shaft are all rotatably connected to the box body of the power box through rolling bearings. The first transmission shaft is connected to the output shaft of the driving motor through a coupling. A first gear and a second gear are fixed on the first transmission shaft and the second transmission shaft. The first gears on the first transmission shaft and the second transmission shaft are meshed. A third gear and a fourth gear are fixed on the third transmission shaft, wherein the fourth gear is located on the lower side of the power box, and the third gear is opposite to the second gear, so that the second gear and the third gear are conveniently meshed. The first gears on the first transmission shaft and the second transmission shaft are meshed, and the third gear on the third transmission shaft is respectively meshed with the second gears on the first transmission shaft and the second transmission shaft. The fourth gear is located between the two sliding panels, and a rack is fixed on the inner side of the sliding panel, which is meshed with the fourth gear.

[0008] The asphalt foaming nozzle comprises a foaming chamber and a transition chamber, wherein an asphalt pipe connected to the asphalt foaming nozzle leads to the transition chamber, a feed pipe is arranged between the foaming chamber and the transition chamber, the upper end of the feed pipe leads to the transition chamber, and the lower end of the feed pipe leads to the foaming chamber, a push-pull rod is arranged in the transition chamber, the upper end of the push-pull rod passes through the upper side of the transition chamber, and three push plates are arranged at the position where the push-pull rod is located in the transition chamber, the cross-sectional area of ​​the push plate matches the cross-sectional area of ​​the inner wall of the feed pipe, so as to facilitate the push plate to slide in the feed pipe, the upper side of the transition chamber can be resistant to high temperature sealing ring to ensure the sealing of the transition chamber and the position where the push-pull rod passes, the distance between adjacent push plates is greater than the length of the feed pipe to ensure that when any one push plate is located in the feed pipe, the other push plates are located outside the feed pipe, a cylinder is fixed on the second mounting frame on the upper side of the asphalt foaming nozzle, the telescopic end of the cylinder is vertically downward, and the telescopic end of the cylinder is fixedly connected to the upper end of the push-pull rod, and the cylinder is used to drive the push-pull rod to reciprocate up and down.

[0009] The outer wall of the foaming cavity is formed with a first annular groove and a second annular groove arranged in parallel and centered on the foaming nozzle, and the side walls of the first annular groove and the second annular groove are evenly provided with water nozzles and air nozzles connected to the foaming cavity, and the center lines of the water nozzles and the air nozzles are both horizontal, and the center lines of the water nozzles and the air nozzles deviate from the center line of the foaming cavity.

[0010] A sleeve is sleeved on the foaming cavity, the sleeve and the first annular groove form a water spray cavity, the sleeve and the second annular groove form an air jet cavity, two nozzle interfaces are distributed on the upper and lower side walls of the sleeve, the upper and lower nozzle interfaces are respectively connected to the water spray cavity and the air jet cavity, after the foaming cavity and the sleeve are sleeved, high temperature resistant sealing rings are respectively provided on the lower sides of the first annular cavity and the second annular cavity to ensure the overall sealing of the foaming cavity and the sleeve after assembly.

[0011] Preferably, the second gear has gear teeth distributed in a semicircular shape, and the cooperation of the gear teeth ensures that the gear teeth of the second gear on the first transmission shaft and the second transmission shaft are alternately connected to the third gear.

[0012] The beneficial effects of the present invention are as follows: the present invention uses an unmanned driving control module to control the locomotive body to travel in the highway maintenance area, and sprays asphalt raw materials and recycled asphalt onto the road surface through an asphalt nozzle and an asphalt foaming nozzle to achieve road maintenance. Under the drive of the driving motor in the power box and the transmission action of the first transmission shaft, the second transmission shaft, and the third transmission shaft, the asphalt nozzle and the asphalt foaming nozzle are driven to move back and forth to ensure uniform asphalt spraying; waste asphalt is processed in the asphalt recovery box to separate asphalt from asphalt aggregate and then reused for highway maintenance, thereby reducing the consumption of asphalt and asphalt aggregate raw materials and reducing the maintenance cost of highway maintenance; the dissolved asphalt is heated to a certain temperature and then recycled to the road surface; the asphalt is recycled to the road surface; the asphalt is recycled to the road surface; the asphalt is recycled to the road surface; the asphalt is recycled to the road surface; the asphalt is recycled to the road surface The trichloroethylene in the asphalt extract is separated from the asphalt, and then the evaporated trichloroethylene is liquefied and recycled through condensation and cooling, which not only reduces the waste of trichloroethylene, but also avoids trichloroethylene vapor from polluting the air; when the recycled asphalt is foamed, the cylinder drives the push plate to move up and down, which not only plays a role in disconnecting the supply of asphalt into the foaming chamber, but also avoids the high-temperature liquid asphalt from clogging the feed pipe; in the process of foaming the recycled asphalt, the water flow generated by the water pump and the air flow generated by the air pump are not only used for the foaming of the asphalt, but also the impact force generated is conducive to the asphalt falling off from between the push plates into the foaming chamber, so as to achieve the cleaning of residual asphalt. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the structural diagram of the unmanned maintenance device; Figure 2 This is the structural diagram of the asphalt spraying device; Figure 3 This is the structural diagram of the asphalt foaming nozzle; Figure 4 This is the structural diagram of the asphalt foaming nozzle.

[0014] Numbers in the figure: 1 locomotive body; 2 unmanned driving control module; 3 asphalt storage tank; 4 asphalt recovery box; 5 first mounting frame; 6 power box; 601 partition; 7 sliding panel; 8 asphalt nozzle; 9 asphalt foaming nozzle; 901 foaming chamber; 902 transition chamber; 903 water nozzle; 904 air nozzle; 9001 first annular groove; 9002 second annular groove; 10 driving motor; 11 first transmission shaft; 12 second transmission shaft; 13 third transmission shaft; 14 first gear; 15 second gear; 16 third gear; 17 fourth gear; 18 rack; 19 feeding pipe; 20 push-pull rod; 21 push plate; 22 second mounting frame; 23 cylinder; 24 kit; 2401 nozzle interface. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: like Figure 1-4As shown, a miniature unmanned highway maintenance device comprises a locomotive body 1, an unmanned driving control module 2 is fixed on the left side of the locomotive body 1, an asphalt storage tank 3 and two asphalt recovery boxes 4 are fixed on the body 1, wherein the asphalt recovery boxes 4 are symmetrically distributed on the left and right sides of the asphalt storage tank 3, an asphalt spraying device is arranged on the rear side of the asphalt storage tank 3, a first mounting frame 5 is arranged between the asphalt spraying device and the asphalt storage tank 3, one side of the first mounting frame 5 is fixedly connected to the rear side of the asphalt storage tank 3, the asphalt spraying device comprises a power box 6, the power box 6 is fixedly connected to the first mounting frame 5, a sliding panel 7 is symmetrically arranged on the lower side of the power box 6, and the sliding panel The upper edge of 7 is a T-shaped structure, and two guide rails are arranged on the lower side of the power box 6. The T-shaped structure on the upper edge of the sliding panel 7 is slidably connected to the guide rail on the lower side of the power box 6, and a row of asphalt spray heads 8 and a row of asphalt foaming spray heads 9 are arranged under the power box 6. A second mounting frame 22 is fixed on the upper side of the asphalt spray heads 8 and the asphalt foaming spray heads 9. The second mounting frames 22 on the upper sides of the asphalt spray heads 8 and the asphalt foaming spray heads 9 are respectively fixedly connected to the sliding panel 7 on the corresponding side, and the nozzles of the asphalt spray heads 8 and the asphalt foaming spray heads 9 are vertically downward, wherein the asphalt spray heads 8 are connected to the asphalt storage tank 3 through an asphalt pipe, and the asphalt foaming spray heads 9 are connected to the asphalt recovery tank 4 through an asphalt pipe.

[0016] In this embodiment, a partition 601 is provided inside the power box 6, and the partition 601 divides the inside of the power box 6 into an upper cavity and a lower cavity, wherein a drive motor 10 is fixed in the upper cavity of the power box 6, and the output shaft of the drive motor 10 is inserted into the lower cavity of the power box 6, and a first transmission shaft 11, a second transmission shaft 12 and a third transmission shaft 13 are provided in the lower cavity of the power box 6, and the first transmission shaft 11, the second transmission shaft 12 and the third transmission shaft 13 are all rotatably connected to the box body of the power box 6 through rolling bearings, and the first transmission shaft 11 is connected to the output shaft of the drive motor 10 through a coupling, and a first gear 14 and a second gear 13 are fixed on the first transmission shaft 11 and the second transmission shaft 12 Wheel 15, the first gear 14 on the first transmission shaft 11 and the second transmission shaft 12 are meshed, and the third gear 16 and the fourth gear 17 are fixed on the third transmission shaft 13, wherein the fourth gear 17 is located on the lower side of the power box 6, and the third gear 16 is opposite to the second gear 15, so as to facilitate the meshing of the second gear 15 and the third gear 16, the first gear 14 on the first transmission shaft 11 and the second transmission shaft 12 are meshed, and the third gear 16 on the third transmission shaft 13 is respectively meshed with the second gear 15 on the first transmission shaft 11 and the second transmission shaft 12, and the fourth gear 17 is located between the two sliding panels 7, and a rack 18 is fixed on the inner side of the sliding panel 7, and the rack 18 is meshed with the fourth gear 17.

[0017] In this embodiment, the asphalt foaming nozzle 9 includes a foaming chamber 901 and a transition chamber 902, wherein the asphalt pipe connected to the asphalt foaming nozzle 9 leads to the transition chamber 902, a feed pipe 19 is arranged between the foaming chamber 901 and the transition chamber 902, the upper end of the feed pipe 19 leads to the transition chamber 902, the lower end of the feed pipe 901 leads to the foaming chamber 901, a push-pull rod 20 is arranged in the transition chamber 902, the upper end of the push-pull rod 20 passes through the upper side of the transition chamber 902, and three push plates 21 are arranged at the position where the push-pull rod 20 is located in the transition chamber 902, and the cross-sectional area of ​​the push plate 21 matches the cross-sectional area of ​​the inner wall of the feed pipe 19. The transition chamber 902 is close-fitting, which facilitates the push plate 21 to slide in the discharge pipe 19. The upper side of the transition chamber 902 can be resistant to high temperature sealing rings to ensure the sealing of the transition chamber 902 and the part where the push-pull rod 20 passes. The distance between adjacent push plates 21 is greater than the length of the discharge pipe 19 to ensure that when any one push plate 21 is located in the discharge pipe 19, the other push plates 21 are located outside the discharge pipe 19. A cylinder 23 is fixed on the second mounting frame 22 on the upper side of the asphalt foaming nozzle 9, and the telescopic end of the cylinder 23 is vertically downward, and the telescopic end of the cylinder 23 is fixedly connected to the upper end of the push-pull rod 20, and the cylinder 23 is used to drive the push-pull rod 20 to move reciprocatingly up and down.

[0018] In this embodiment, the outer wall of the foaming cavity 901 is formed with a first annular groove 9001 and a second annular groove 9002, which are arranged in parallel and centered on the foaming nozzle. The side walls of the first annular groove 9001 and the second annular groove 9002 are evenly provided with water nozzles 903 and air nozzles 904 that are connected to the foaming cavity 901. The center lines of the water nozzles 903 and the air nozzles 904 are both horizontal, and the center lines of the water nozzles 903 and the air nozzles 904 deviate from the center line of the foaming cavity 901.

[0019] In this embodiment, the foaming cavity 901 is covered with a sleeve 24, and the sleeve 24 and the first annular groove 9001 form a water spray cavity 2402, and the sleeve 24 and the second annular groove 9002 form an air jet cavity. Two nozzle interfaces 2401 are distributed on the upper and lower side walls of the sleeve 24, and the upper and lower nozzle interfaces 2401 are respectively connected to the water spray cavity and the air jet cavity. After the foaming cavity 901 and the sleeve 24 are fitted together, the lower sides of the first annular cavity 9001 and the second annular cavity 9002 are respectively provided with high temperature resistant sealing rings to ensure the overall sealing of the foaming cavity 901 and the sleeve 24 after assembly.

[0020] In this embodiment, the second gear 15 has gear teeth distributed in a semicircular shape. Under the cooperation of the gear teeth, the gear teeth of the second gear 15 on the first transmission shaft 11 and the second transmission shaft 12 are alternately connected to the third gear 16 for transmission.

[0021] In this embodiment: the working process of the present invention is: The present invention lays asphalt aggregate with a good ratio on the road surface to be maintained; uses an unmanned driving control module to control a locomotive body 1 to travel in a road maintenance area, uses an asphalt pump to pump the asphalt raw material in an asphalt storage tank 3 into an asphalt nozzle 8 through an asphalt pipe, and sprays it onto the road surface from the asphalt nozzle 8, and pumps the recycled asphalt processed and recovered in an asphalt recovery tank 4 into an asphalt foaming nozzle 9 through an asphalt pump, sprays the recycled asphalt onto the road surface, and in the process of spraying the asphalt raw material and the recycled asphalt, a driving motor 10 drives a first transmission shaft 11 and a second transmission shaft 12 to rotate, and the first transmission shaft 11 and the second transmission shaft 12 are driven by the first transmission shaft 11 and the second transmission shaft 12. A gear 14 is connected in transmission to realize that the first transmission shaft 11 and the second transmission shaft 12 rotate in opposite directions. The second gears 15 on the first transmission shaft 11 and the second transmission shaft 12 are alternately connected in transmission with the third gear 16 on the third transmission shaft 13, driving the third transmission shaft 13 to rotate back and forth, driving the fourth gear 17 to rotate back and forth, and with the cooperation of the fourth gear 17 and the rack 18, the sliding panel 7 is driven to reciprocate along the guide rail of the power box 6, thereby driving the asphalt nozzle 8 and the asphalt foaming nozzle 9 to reciprocate. The range of spraying asphalt is adjusted by reciprocating the asphalt nozzle 8 and the asphalt foaming nozzle 9 to ensure uniform asphalt spraying.

[0022] In this embodiment, after the asphalt raw material for maintenance is put into the asphalt storage tank 3, the asphalt raw material is microwave-heated at a temperature of 130-150°C in the asphalt storage tank 3 until high-temperature liquid asphalt is formed, so that the asphalt pump can pump the asphalt raw material from the asphalt storage tank 3 into the asphalt nozzle 8 and spray it onto the road surface; In this embodiment, the asphalt recovery process is as follows: S1: Recycling the waste asphalt on the road area that needs maintenance and putting it into the asphalt recovery box 4, washing and screening it with clean water in the asphalt recovery box 4 to remove dust and other visible debris on the surface of the waste asphalt; S2: The waste asphalt after cleaning in step S1 is placed in a microwave and heated at a temperature of 100°C-120°C for 100-130 minutes to decompose the waste asphalt into small particles. S3: When the temperature of the waste asphalt after the treatment in step S2 drops to 60°C, a trichloroethylene solution is injected into the waste asphalt to immerse it, and centrifugal separation and filtration are performed to separate the asphalt extract from the asphalt aggregate, wherein the recovered asphalt aggregate is directly used for road maintenance, thereby reducing the consumption of asphalt aggregate raw materials. S4: heating the asphalt extract produced in step S3 in an oil bath, and controlling the heating temperature at 100-110° C., utilizing the different boiling points of asphalt and trichloroethylene to evaporate trichloroethylene, thereby achieving separation of asphalt and trichloroethylene; S5: The trichloroethylene produced in step S4 is condensed and cooled to 60° C., recovered and re-injected into the solution formed in step S3, thereby realizing the recycling of trichloroethylene, reducing the waste of trichloroethylene, and preventing the trichloroethylene vapor from diffusing into the air; S6: The asphalt obtained in step S4 is heated to above 150°C to form high-temperature liquid asphalt, and the high-temperature liquid asphalt is pumped into the transition chamber 902 by an asphalt pump. Then, the push plate 21 moves up and down under the driving action of the cylinder 23, and the asphalt is pushed from the transition chamber 902 into the discharge pipe 19, and is transported to the foaming chamber 901 as the push plate 21 moves downward; the up and down reciprocating movement of the push plate 21 not only plays the role of switching on and off the supply of asphalt into the foaming chamber 901, but also plays the role of mechanically cleaning the residual asphalt. S7: During step S6, the water pump sprays cold water from the first annular groove 9001 and the water nozzle 903 onto the hot asphalt in the foaming cavity 901. The cold water and the hot asphalt exchange energy, the temperature of the water droplets increases, and the temperature of the surrounding asphalt decreases; S8: The air pump sprays the high-pressure gas generated by compression into the foaming chamber 901 from the second annular groove 902 and the air nozzle 904, so as to form a high-pressure environment in the foaming chamber 901. The cold water exchanges energy with the hot asphalt and heats up to generate steam that expands rapidly. The steam bubbles are pressed into the continuous phase of the asphalt under the pressure generated by the high-pressure gas, thereby forming asphalt foam and completing the foaming treatment of the recovered asphalt. The water flow generated by the water pump and the air flow generated by the air pump are not only used for the foaming of the asphalt, but the impact force generated at the same time is conducive to blowing the asphalt into the foaming chamber 901. By recycling the asphalt and reusing it after the foaming treatment, the consumption of asphalt raw materials is reduced, and the cost of highway maintenance is reduced. In addition, since additional asphalt raw materials are provided, highway maintenance can be carried out before the recovery and foaming treatment of waste asphalt are completed, thereby ensuring the efficiency of highway maintenance.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A miniature unmanned highway maintenance device, comprising a locomotive body, Features: An unmanned driving control module is fixed on the left side of the locomotive body, an asphalt storage tank and two asphalt recovery boxes are fixed on the body, wherein the asphalt recovery boxes are symmetrically distributed on the left and right sides of the asphalt storage tank, an asphalt spraying device is arranged on the rear side of the asphalt storage tank, a first mounting frame is arranged between the asphalt spraying device and the asphalt storage tank, one side of the first mounting frame is fixedly connected to the rear side of the asphalt storage tank, the asphalt spraying device includes a power box, the power box is fixedly connected to the first mounting frame, a sliding panel is symmetrically arranged on the lower side of the power box, the upper edge of the sliding panel is a T-shaped structure, the power box Two guide rails are arranged on the lower side of the power box, and the T-shaped structure on the upper edge of the sliding panel is slidably connected to the guide rails on the lower side of the power box, and a row of asphalt spray heads and a row of asphalt foaming spray heads are arranged under the power box, and a second mounting frame is fixed on the upper side of the asphalt spray head and the asphalt foaming spray head, and the second mounting frame on the upper side of the asphalt spray head and the asphalt foaming spray head is respectively fixedly connected to the sliding panel on the corresponding side, and the nozzles of the asphalt spray head and the asphalt foaming spray head are vertically downward, wherein the asphalt spray head is connected to the asphalt storage tank through an asphalt pipe, and the asphalt foaming spray head is connected to the asphalt recovery tank through an asphalt pipe.

2. A miniature unmanned highway maintenance device according to claim 1 It is characterized in that A partition is provided inside the power box, which divides the inside of the power box into an upper cavity and a lower cavity. A driving motor is fixed in the upper cavity of the power box, and the output shaft of the driving motor is inserted into the lower cavity of the power box. A first transmission shaft, a second transmission shaft and a third transmission shaft are provided in the lower cavity of the power box. The first transmission shaft, the second transmission shaft and the third transmission shaft are all rotatably connected to the box body of the power box through rolling bearings. The first transmission shaft is connected to the output shaft of the driving motor through a coupling. A first gear and a second gear are fixed on the first transmission shaft and the second transmission shaft. The first gears on the first transmission shaft and the second transmission shaft are meshed. A third gear and a fourth gear are fixed on the third transmission shaft, wherein the fourth gear is located on the lower side of the power box, and the third gear is opposite to the second gear, so that the second gear and the third gear are conveniently meshed. The first gears on the first transmission shaft and the second transmission shaft are meshed, and the third gear on the third transmission shaft is respectively meshed with the second gears on the first transmission shaft and the second transmission shaft. The fourth gear is located between the two sliding panels, and a rack is fixed on the inner side of the sliding panel, which is meshed with the fourth gear.

3. A miniature unmanned road maintenance device according to claim 1 It is characterized in that The asphalt foaming nozzle comprises a foaming chamber and a transition chamber, wherein an asphalt pipe connected to the asphalt foaming nozzle leads to the transition chamber, a feed pipe is arranged between the foaming chamber and the transition chamber, the upper end of the feed pipe leads to the transition chamber, and the lower end of the feed pipe leads to the foaming chamber, a push-pull rod is arranged in the transition chamber, the upper end of the push-pull rod passes through the upper side of the transition chamber, and three push plates are arranged at the position where the push-pull rod is located in the transition chamber, the cross-sectional area of ​​the push plate matches the cross-sectional area of ​​the inner wall of the feed pipe, so as to facilitate the push plate to slide in the feed pipe, the upper side of the transition chamber can be resistant to high temperature sealing ring to ensure the sealing of the transition chamber and the position where the push-pull rod passes, the distance between adjacent push plates is greater than the length of the feed pipe to ensure that when any one push plate is located in the feed pipe, the other push plates are located outside the feed pipe, a cylinder is fixed on the second mounting frame on the upper side of the asphalt foaming nozzle, the telescopic end of the cylinder is vertically downward, and the telescopic end of the cylinder is fixedly connected to the upper end of the push-pull rod, and the cylinder is used to drive the push-pull rod to reciprocate up and down.

4. A miniature unmanned road maintenance device according to claim 2 It is characterized in that The gear teeth of the second gear are distributed in a semicircular shape. Under the cooperation of the gear teeth, it is ensured that the gear teeth of the second gear on the first transmission shaft and the second transmission shaft are alternately connected to the third gear.

5. A miniature unmanned road maintenance device according to claim 3 It is characterized in that The outer wall of the foaming cavity is formed with a first annular groove and a second annular groove arranged in parallel and centered on the foaming nozzle, and the side walls of the first annular groove and the second annular groove are evenly provided with water nozzles and air nozzles connected to the foaming cavity, and the center lines of the water nozzles and the air nozzles are both horizontal, and the center lines of the water nozzles and the air nozzles deviate from the center line of the foaming cavity.

6. A miniature unmanned road maintenance device according to claim 3 It is characterized in that A sleeve is sleeved on the foaming cavity, the sleeve and the first annular groove form a water spray cavity, the sleeve and the second annular groove form an air jet cavity, two nozzle interfaces are distributed on the upper and lower side walls of the sleeve, the upper and lower nozzle interfaces are respectively connected to the water spray cavity and the air jet cavity, after the foaming cavity and the sleeve are sleeved, high temperature resistant sealing rings are respectively provided on the lower sides of the first annular cavity and the second annular cavity to ensure the overall sealing of the foaming cavity and the sleeve after assembly.

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