A method and device for improving road construction curing conditions

Abstract

The present invention discloses a method and equipment for improving the curing conditions of pavement construction, and belongs to the technical field of road construction. The method for improving the curing conditions of pavement construction of the present invention is aimed at pavement construction using emulsified asphalt as a binder, and when the ambient temperature is lower than 25°C, hot air is used to improve the curing conditions and shorten the curing time. The equipment for improving the curing conditions of pavement construction of the present invention comprises a frame, on which a burner and a hot air furnace connected to the burner are provided; the hot air furnace is connected to an oven through an air outlet pipe; and the bottom of the oven is a jet orifice plate. The method of the present invention overcomes the temperature limitation of pavement construction and prolongs the construction period; in the equipment for improving the curing conditions of pavement construction of the present invention, the burner burns, and the hot air is transported to the oven through the hot air furnace and the air outlet pipe respectively, and the bottom of the oven is a jet orifice plate, which can evenly and gently transmit the hot air to the pavement to be cured, and has a high thermal energy utilization rate.

Description

Technical Field

[0001] The present invention relates to the technical field of road construction, and in particular to a method and equipment for improving road construction curing conditions. Background Art

[0002] After a certain period of use, the road has sufficient structural strength, but the road surface will have aging of the binder, cracks, insufficient skid resistance and increased water seepage. In particular, water damage accelerates the spread of the disease, so appropriate maintenance measures that do not increase the structural bearing capacity should be taken as soon as possible; improve the functional condition of the road surface, restore, improve and protect the original road surface function, extend the service life, eliminate driving safety hazards, and save later maintenance costs. The "Outline for the Development of Highway Maintenance Management" proposes maintenance goals: comprehensive preventive maintenance, the average annual implementation mileage of expressway preventive maintenance (single lane mileage) is not less than 8%, and ordinary national and provincial roads are not less than 5%. It is expected to increase by 5% year by year. By the end of 2019, with nearly 150,000 kilometers of expressways and more than 600,000 kilometers of second-level and above highways in my country, the maintenance market size is expected to continue to increase.

[0003] In 2017, the Ministry of Transport issued the "Opinions on Comprehensively and Deeply Promoting the Development of Green Transportation", proposing the important goal of initially building a green transportation system with scientific layout, eco-friendly, clean and low-carbon, intensive and efficient by 2020. During the operation and maintenance stage, all highway management and maintenance units will vigorously promote the adoption of "four new" technologies to achieve green and low-carbon daily maintenance, preventive maintenance, and asphalt pavement recycling, so as to achieve safe and comfortable driving and extend the service life of roads. Improving material performance and reducing construction temperature process requirements will promote the widespread application of emulsified asphalt.

[0004] Maintenance and construction work is generally carried out without completely blocking traffic. Therefore, in order to minimize the impact on the passage of social vehicles and occupy as little road resources as possible, maintenance and construction work is required to open traffic quickly.

[0005] In the construction of pavement with emulsified asphalt as a binder, such as anti-skid and low-noise super-surfacing, anti-skid and low-noise fine overlay, micro-surfacing, slurry seal, synchronous crushed stone seal, cold regeneration, etc., there are many restrictions on natural environmental factors, among which the temperature has the greatest impact, which is mainly manifested in the following aspects:

[0006] (1) When the ambient temperature is lower than 15°C, construction quality cannot be guaranteed and construction cannot be carried out regardless of whether there is light or not;

[0007] (2) When the ambient temperature is 15-20°C and there is sufficient light, the curing time is extended by 1-2 hours compared to when the ambient temperature is >20°C. When it is cloudy or overcast, the curing time is extended by 3-4 hours compared to when the ambient temperature is >20°C.

[0008] (3) In tunnel construction, the ambient temperature and ground temperature are both low, there is no sunlight, and the curing time is generally extended by 3 to 4 hours compared to the ideal state. Especially for highway and national and provincial trunk road construction, it is required to evacuate the construction section before dark, and the construction time is very limited;

[0009] (4) Municipal road construction, in order to avoid traffic congestion, generally requires night work (22:00 to 6:00 the next day), the ambient temperature and ground temperature are low, there is no light, and the curing time is generally 3-4 hours longer than the ideal state. Especially for the construction of urban trunk roads, it is required to evacuate the construction section before the next morning rush hour, and the construction time is very limited;

[0010] (5) For cold regeneration of emulsified asphalt, the curing period is generally 3 to 5 days. During the curing period, the upper layer cannot be paved, and the construction efficiency is low;

[0011] (6) Generally speaking, the temperature from October to May of the following year in northern China and from November to April of the following year in southern China cannot meet the normal demulsification conditions of emulsified asphalt, which in turn reduces the construction efficiency. The viscosity of asphalt is greatly reduced due to low temperature and residual moisture, which ultimately leads to the inability to ensure the quality of the maintenance layer, resulting in peeling and threshing. The effective construction season is less than half a year. With the rapid development of my country's road transportation industry, roads of all grades have entered the maintenance and repair stage on a large scale. How to overcome the construction temperature limit and extend the construction period is imminent.

[0012] Although the demulsification time of emulsified asphalt can be adjusted to a certain extent by optimizing the asphalt emulsifier formula, the problem cannot be fundamentally solved.

[0013] Considering the use of external heat sources to improve curing conditions is a useful attempt to solve the above problems. At present, there is no corresponding auxiliary equipment for improving curing conditions in the domestic market for pavement construction using emulsified asphalt as a binder, and curing is completely dependent on natural conditions.

[0014] In summary, the road construction with emulsified asphalt as binder still completely relies on natural conditions for curing, which can easily affect the construction quality and efficiency. Therefore, developing a practical method and equipment to improve the curing conditions of road construction has important social and economic benefits. Summary of the invention

[0015] In order to make up for the deficiencies of the prior art, the present invention provides a method and equipment for improving road construction curing conditions.

[0016] The technical solution of the present invention is:

[0017] A method for improving the curing conditions of road construction, wherein the road construction uses emulsified asphalt as a binder, and when the ambient temperature is lower than 25°C, hot air is used to improve the curing conditions and shorten the curing time.

[0018] As a preferred solution, the hot air temperature is 200-900°C; the road surface temperature after heating is 80-130°C.

[0019] As a preferred solution, the hot air is the hot air output from a hot air furnace.

[0020] The equipment for implementing the method for improving the road construction curing conditions comprises a frame, a burner and a hot air furnace connected to the burner are arranged on the frame; the hot air furnace is connected to an oven through an air outlet pipe; a jet orifice plate is arranged at the bottom of the oven. The hot air in the hot air furnace is blown to the road surface to be heated through the air outlet pipe and the jet orifice plate.

[0021] As a preferred solution, the oven shell includes an outer shell and an inner shell, the outer shell is flush with the bottom surface of the inner shell, the jet orifice plate serves as the bottom plate of the inner shell, and the bottom of the outer shell is connected to the inner shell through a plurality of ribs; the ribs connect the outer shell and the inner shell as a whole; the ends of the air outlet pipes extend through the outer shell and the inner shell to the inside of the inner shell respectively. The double-layer shell is mainly used to set up a hot air circulation system; in addition, the double-layer shell also has a certain heat preservation function.

[0022] Furthermore, it also includes a hot air circulation system, which includes an induced draft fan and a return air duct, one end of the return air duct is connected to the heating chamber of the hot air furnace, and the other end of the return air duct is arranged on the outer shell, and the gap between the bottom surface of the outer shell and the bottom surface of the inner shell is the return air port. After the hot air is ejected from the jet orifice plate, a part of the hot air enters the cavity between the outer shell and the inner shell through the return air port, and then is recovered to the hot air furnace by the return air duct under the action of the induced draft fan.

[0023] As a preferred solution, the holes on the jet orifice plate are unevenly distributed, and the jet orifice plate area corresponding to the rutting area has a high hole density, in order to ensure the uniformity of temperature and the efficient utilization of heat energy in a specific area as much as possible.

[0024] As a preferred solution, the center of the air outlet pipe is 0.5~1.2m away from the jet orifice plate. 2 The area of ​​the jet orifice plate is set as a non-porous area; the edge of the jet orifice plate is set as a non-porous area. The position of the jet orifice plate close to the air outlet is set as a non-porous area to prevent the local temperature from being too high and damaging the road surface; the non-porous area is set at the edge of the jet orifice plate to allow more heat to be recycled and reused, reducing heat loss from the edge of the jet orifice plate.

[0025] As a preferred solution, the front side and / or the rear side of the oven are each detachably connected to one or more air guide plates. In order to further reduce heat loss, air guide plates are provided on both sides or one side of the oven for the hot air to extend forward and backward.

[0026] As a preferred solution, the frame is placed on a tractor, and the jet orifice plate faces the ground.

[0027] As a preferred solution, oven sliding shoes are provided on both sides of the oven.

[0028] As a preferred solution, air guide plate sliding shoes are provided on both sides of the air guide plate.

[0029] As a preferred solution, a limit rod is provided between the oven and the trolley, one end of the limit rod is hinged to the trolley, and the other end of the limit rod is hinged to the oven.

[0030] As a preferred solution, the outlet duct and the return air duct are both provided with temperature collectors, and the outlet air temperature and the return air temperature perform dual temperature control on the burner ignition; the outlet air temperature is set to 200~900℃; the return air temperature is set to 50~500℃; when any temperature of the outlet air and the return air reaches the set limit, the burner automatically adjusts the ignition stage.

[0031] As a preferred solution, the induced draft fan inlet is provided with a return air regulating valve and a cold air inlet valve.

[0032] As a preferred solution, the equipment has an independent travel power system, a driven gear disc is installed on the tractor drive shaft, and hydraulic pressure is output by the equipment power system, and the driving gear disc is driven to rotate by the hydraulic motor, and the driving gear disc and the driven gear disc are meshed to drive the tractor to travel.

[0033] The beneficial effects of the present invention are:

[0034] 1. When the ambient temperature is lower than 15°C, the ambient temperature cannot meet the health-preserving conditions. By adopting the method and equipment of the present invention, the problem of insufficient low-temperature health-preserving conditions can be solved, the construction quality can be guaranteed, and the problem of being unable to construct in a low-temperature environment can be fundamentally solved;

[0035] 2. In daytime construction, tunnel construction, municipal road night construction, etc. where the ambient temperature is 15-20°C, the method and equipment of the present invention can shorten the curing time, quickly open traffic, and ensure construction quality;

[0036] 3. Cold regeneration of emulsified asphalt, by adopting the method and equipment of the present invention, shortens the curing time, ensures the construction quality and improves the construction efficiency;

[0037] 4. Overcame the construction temperature limitation and extended the construction period;

[0038] 5. The equipment for improving the curing conditions of road construction of the present invention is that the burner burns, and the hot air is transported to the oven through the hot air furnace and the air outlet pipe respectively. The bottom of the oven is a jet orifice plate, which can evenly and gently transmit the hot air to the curing road surface, avoiding the phenomenon of scorching the road surface and vegetation;

[0039] 6. The equipment for improving the road construction curing conditions of the present invention has a hot air circulation system, which effectively realizes heat recovery.

[0040] 7. The device for improving the curing conditions of road construction of the present invention has an air guide plate, which guides the hot air flowing out of the bottom of the oven to both sides, thereby significantly improving the utilization rate of heat.

[0041] 8. The equipment for improving the road construction curing conditions of the present invention is an independent equipment and can be towed by various types of load-carrying transport vehicles and vehicle-mounted crane transport vehicles. The equipment has a simple structure and low resource occupancy rate. After use, the original vehicle function can be restored after unloading.

[0042] 9. The equipment for improving the road construction curing conditions of the present invention can also be equipped with an independent travel power system, that is, a driven gear disc is installed on the drive shaft of the hauling vehicle, and the equipment power system outputs hydraulic pressure, and the driving gear disc is driven to rotate by the hydraulic motor, and the driving gear disc and the driven gear disc are meshed to drive the hauling vehicle to travel, and the travel speed is adjustable from 0 to 100 m / min, which solves the problem that the hauling vehicle still travels too fast at the lowest idle gear, affecting the heating effect. The equipment travel power system and the original vehicle power system of the hauling vehicle are switched through a clutch. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0044] Figure 1 This is a schematic diagram of the main structure of the device for improving road construction curing conditions according to the present invention;

[0045] Figure 2 A schematic diagram of the top view of the structure of the device for improving the road construction curing conditions of the present invention;

[0046] Figure 3 It is a schematic diagram of the connection relationship between the burner, the hot air furnace and the air outlet pipe;

[0047] Figure 4 It is the structural schematic diagram of the oven;

[0048] Figure 5 Schematic diagram of the top view of the oven;

[0049] Figure 6 is a schematic diagram of the connection relationship between the air deflector and the air deflector sliding shoe;

[0050] Figure 7 is a schematic diagram of the structure of the air guide plate;

[0051] Figure 8 It is the structural schematic diagram of the jet orifice plate;

[0052] Fig. 9 This is a schematic diagram of the structure of Example 2. DETAILED DESCRIPTION

[0053] 1. Equipment

[0054] Example 1

[0055] like Figure 1-Figure 8 As shown, the equipment for improving the curing conditions of road construction includes a frame, a heating mechanism, a road surface heating mechanism, a hot air circulation mechanism, a power mechanism and an air guide mechanism.

[0056] The temperature raising mechanism includes a burner 6, a hot air furnace 7 and an air outlet pipe 8. The hot air furnace 7 includes a furnace 7-1, a heating chamber 7-2 and a constriction 7-3. Both the furnace 7-1 and the heating chamber 7-2 adopt a "Venturi tube" type constriction 7-3. The air outlet pipe 8 is composed of an air outlet elbow 8-1 and an air outlet hose 8-2. The hot air furnace 7 is fixed on the base frame 2, and the front end of the hot air furnace 7 is connected to the nozzle of the burner 6, and the rear end is connected to the air outlet elbow 8-1.

[0057] The road surface heating mechanism is an oven 9, and the bottom surface of the oven 9 is a jet orifice plate 9-3. The end of the air outlet hose 8-2 is connected to the inside of the oven 9, and the hot air is jetted to the curing road surface through the jet orifice plate 9-3.

[0058] In order to reduce heat loss, a hot air circulation mechanism is provided. In order to realize hot air circulation, the shell of the oven 9 includes an outer shell 9-10 and an inner shell 9-9. The outer shell 9-10 is flush with the bottom surface of the inner shell 9-9. The jet orifice plate serves as the bottom panel of the inner shell 9-9. The bottom of the outer shell 9-10 is connected to the inner shell 9-9 through a plurality of rib plates 9-5; the rib plates 9-5 connect the outer shell 9-10 and the inner shell 9-9 as a whole; the space enclosed by the inner shell 9-9 constitutes a hot air cavity 9-1; the ends of the air outlet hose 8-2 respectively pass through the outer shell 9-10 and the inner shell 9-9 and enter the hot air cavity 9-1. The gaps between the bottom surface of the outer shell 9-10 and the bottom surface of the inner shell 9-9 serve as the return air port 9-4; the outer shell 9-10 is provided with an air outlet 9-6; the space enclosed between the inner shell 9-9 and the outer shell 9-10 constitutes the recovery chamber 9-2; the hot air circulation mechanism also includes an induced draft fan 12 and a return air duct 11, one end of the return air duct 11 is connected to the heating chamber of the hot air furnace 7, and the other end of the return air duct 11 is connected to the air outlet 9-6. The hot air ejected from the jet orifice plate is partially blown to the ground, and part of it enters the recovery chamber 9-2 from the return air port 9-4 under the action of the induced draft fan 12, and then enters the return air duct 11 from the air outlet 9-6, and finally enters the heating chamber of the hot air furnace 7, realizing the recycling of heat.

[0059] In order to increase the uniformity of road surface heating, the holes on the jet orifice plate 9-3 are unevenly distributed; the density of holes in the area of ​​the jet orifice plate 9-3 opposite to the rutting area is high.

[0060] In order to avoid overheating of the area facing the air outlet, the center of the end of the air outlet hose 8-2 faces the jet orifice 9-3 with a radius of 1 m 2 The area is set as a hole-free area.

[0061] In order to further reduce heat loss, a non-porous area is set at the edge of the jet orifice plate 9-3. In addition, a fence is set at the front end of the bottom surface of the outer shell 9-10, and the height of the fence is about 3 cm; more heat can be recycled and reused, and heat loss from the edge of the jet orifice plate is reduced.

[0062] In order to further reduce heat loss, an air guide mechanism is provided, that is, three air guide plates 10 are provided at the rear side of the oven 9; two air guide plates 10 are hingedly connected to each other, and the air guide plates 10 and the oven 9 are hingedly connected to each other.

[0063] Oven sliding shoes 9-8 are fixed on both sides of the oven 9, and air guide plate sliding shoes 10-1 are fixed on both sides of the air guide plate 10. The oven sliding shoes 9-8 and the air guide plate sliding shoes 10-1 contact the curing road surface.

[0064] The frame is composed of a base frame 2 and an intermediate frame 4; the induced draft fan 12 is arranged inside the intermediate frame 4; an engine 3 is fixedly arranged on the base frame 3, the main shaft of the engine 3 drives the induced draft fan 12 to work, and the secondary shaft drives the generator 5 to work, and the generator 5 supplies power to the burner 6.

[0065] During operation, the chassis 2 can be placed on the truck undercarriage 1. When the chassis 2 is placed on the truck undercarriage, the jet orifice 9-3 faces the road surface to be maintained. A limit rod 9-7 is provided between the oven 9 and the truck, one end of which is hinged to the truck and the other end is hinged to the oven 9.

[0066] An independent travel power system can also be set up, that is, a driven gear disc is installed on the drive shaft of the haulage vehicle, and the equipment power system outputs hydraulic pressure, and the hydraulic motor drives the active gear disc to rotate, and the active gear disc and the driven gear disc are engaged to drive the haulage vehicle to travel. The travel speed is adjustable from 0 to 100 m / min, which solves the problem that the haulage vehicle still travels too fast at the lowest idle gear, affecting the heating effect. The equipment travel power system and the original power system of the haulage vehicle are switched through a clutch.

[0067] The outlet and return air ducts are equipped with temperature collectors. The outlet and return air temperatures are used to control the burner ignition temperature. The outlet air temperature is set at 200~900℃; the return air temperature is set at 50~500℃. When any of the outlet and return air temperatures reaches the set limit, the burner automatically adjusts the ignition stage. By adjusting the outlet and return air temperatures, the heat output per unit time is adjusted to control the road surface heating effect. After heating, the road surface temperature is controlled at 80~130℃, which not only ensures the heating effect, but also avoids asphalt overheating and aging. The induced draft fan inlet is equipped with a return air regulating valve and a cold air inlet valve.

[0068] Example 2

[0069] like Fig. 9 As shown, compared with the embodiment 1, the air guide mechanism is as follows: an air guide plate 10 is arranged at the front side of the oven 9, two air guide plates 10 are arranged at the rear side of the oven 9, the two air guide plates 10 are hingedly connected, and the air guide plates 10 are hingedly connected to the oven 9. The rest is the same as the embodiment 1.

[0070] Example 3

[0071] Equipment for improving road construction curing conditions, including a frame, a heating mechanism, a road surface heating mechanism, and a power mechanism.

[0072] The temperature raising mechanism includes a burner 6, a hot air furnace 7 and an air outlet pipe 8. The hot air furnace 7 includes a furnace 7-1, a heating chamber 7-2 and a constriction 7-3. Both the furnace 7-1 and the heating chamber 7-2 adopt a "Venturi tube" type constriction 7-3. The air outlet pipe 8 is composed of an air outlet elbow 8-1 and an air outlet hose 8-2. The hot air furnace 7 is fixed on the base frame 2, and the front end of the hot air furnace 7 is connected to the nozzle of the burner 6, and the rear end is connected to the air outlet elbow 8-1.

[0073] The road surface heating mechanism is an oven 9, and the bottom surface of the oven 9 is a jet orifice plate 9-3. The end of the air outlet hose 8-2 is connected to the inside of the oven 9, and the hot air is jetted to the curing road surface through the jet orifice plate 9-3.

[0074] 2. Methods to improve road construction curing conditions

[0075] Embodiment 4:

[0076] This process is used for anti-skid and low-noise super-surfacing construction. Anti-skid and low-noise super-surfacing is a maintenance technology that uses a super-surfacing sealing vehicle to simultaneously sprinkle / spread multiple layers of interlayer interface agent, emulsified high-viscosity asphalt, aggregate, emulsified high-viscosity asphalt, surface protective agent, etc. on the original road surface; according to the construction thickness, it is divided into Type I (3mm), Type II (6mm), and Type III (8mm). The construction type of this embodiment is Type II, the construction section is a tunnel, the ambient temperature is 7~9℃, the ground temperature is 12~13℃, and the construction process is: closed traffic->anti-skid and low-noise super-surfacing spreading / spreading operation->natural curing until the construction surface has initial strength->the equipment of the present invention for improving the road construction curing conditions is towed by a haulage vehicle to heat the construction surface->heating is completed and traffic is opened.

[0077] Specifically, 2 hours after the anti-skid and low-noise super-surface spreading / spreading is completed, the curing layer has initial strength, and the equipment for improving the road construction curing conditions of the present invention is towed by the vehicle-mounted crane to heat the curing layer, and the construction vehicle speed is controlled at 8m / min. The hot air blower outlet duct and the return air duct are both equipped with temperature collectors. The outlet air temperature and the return air temperature are used to control the burner ignition temperature. The upper limit of the outlet air temperature is set at 700°C, and the upper limit of the return air temperature is set at 230°C. The road surface temperature after heating is 110°C. After the heating is completed, traffic is immediately opened. It is observed later that various road performance indicators meet the design requirements. In the natural curing section, the comparative data are as follows:

[0078]

[0079] Embodiment 5:

[0080] The process is used for micro-surfacing construction. The construction section is a highway bridge deck. The ambient temperature is 3-8°C, the ground temperature is 5-12°C, and it is cloudy. The construction process is: closed traffic -> micro-surfacing paving operation -> natural curing until the construction surface has initial strength -> the equipment for improving road construction curing conditions of the present invention is towed by a tractor to heat the construction surface -> heating is completed and traffic is opened.

[0081] Specifically, 1.5 hours after the micro-surfacing is completed, the curing layer has initial strength, and the equipment for improving the curing conditions of road construction of the present invention is towed by the vehicle crane to heat the curing layer, and the construction vehicle speed is controlled at 5m / min. The hot air blower outlet duct and return air duct are both equipped with temperature collectors, and the outlet air temperature and return air temperature are used to control the burner ignition temperature. The upper limit of the outlet air temperature is set at 800°C, and the upper limit of the return air temperature is set at 300°C. The road surface temperature after heating is 105°C. After the heating is completed, traffic is immediately opened, and subsequent observations show that various road performance indicators meet the design requirements. In the section of natural curing, the comparative data are as follows:

[0082]

[0083] Embodiment 6:

[0084] The process is used for cold recycling of factory-mixed emulsified asphalt. The construction section is the national highway base, the ambient temperature is 18-25°C, and it is sunny. The construction process is: paving the cold recycled emulsified asphalt mixture in the closed operation section -> natural curing to form initial strength -> the equipment for improving the curing conditions of road construction of the present invention is towed by a tractor to heat the construction surface -> heating is completed, and the core sampling test is qualified.

[0085] Specifically, 24 hours after the emulsified asphalt cold recycled mixture is paved, the equipment for improving the road construction curing conditions of the present invention is towed by the vehicle crane to heat the curing layer, and the construction vehicle speed is controlled at 2m / min. The hot air blower outlet duct and return air duct are both equipped with temperature collectors. The outlet air temperature and return air temperature are used to control the burner ignition temperature. The upper limit of the outlet air temperature is set at 600°C, and the upper limit of the return air temperature is set at 200°C. The road surface temperature after heating is 122°C, and the core sampling test is qualified after the heating is completed. For the road sections with natural curing, the comparative data are as follows:

[0086]

Claims

1. A device for improving road construction curing conditions, characterized in that: The machine comprises a frame, on which a burner and a hot air furnace connected to the burner are arranged; the hot air furnace is connected to an oven through an air outlet pipe; a jet orifice plate is arranged at the bottom of the oven; The distribution of holes on the jet orifice plate is uneven; the density of holes in the jet orifice plate area corresponding to the rutting area is large; The center of the air outlet pipe faces the jet orifice plate with a radius of 0.5~1.2m 2 The area is set as a non-porous area; the edge of the jet orifice plate is set as a non-porous area; The front side and / or the rear side of the oven are each detachably connected to one or more air guide plates; Oven sliding shoes are arranged on both sides of the oven; and air guide plate sliding shoes are arranged on both sides of the air guide plate.

2. The device according to claim 1, characterized in that: The oven shell comprises an outer shell and an inner shell. The outer shell is flush with the bottom surface of the inner shell. The jet orifice plate serves as the bottom plate of the inner shell. The bottom of the outer shell is connected to the inner shell via a plurality of rib plates. The rib plates connect the outer shell and the inner shell as a whole. The ends of the air outlet pipe respectively pass through the outer shell and the inner shell and extend to the inside of the inner shell.

3. The device according to claim 2, characterized in that: It also includes a hot air circulation system, which includes an induced draft fan and a return air duct. One end of the return air duct is connected to the heating chamber of the hot air furnace, and the other end of the return air duct is arranged on the outer shell. The gap between the bottom surface of the outer shell and the bottom surface of the inner shell is the return air outlet.

4. The device according to any one of claims 1 to 3, characterized in that: The frame is placed on a haulage vehicle, and the jet orifice plate faces the ground.

5. The device according to claim 4, characterized in that: A limiting pull rod is provided between the oven and the hauling vehicle, one end of the limiting pull rod is hinged to the hauling vehicle, and the other end of the limiting pull rod is hinged to the oven.

6. The device according to claim 3, characterized in that: The outlet duct and the return air duct are both provided with temperature collectors, and the outlet air temperature and the return air temperature perform dual temperature control on the burner ignition; the outlet air temperature is set at 200-900°C; the return air temperature is set at 50-500°C; when any of the outlet air and return air temperatures reaches the set limit, the burner automatically adjusts the ignition stage.

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