Asphalt road surface microwave response marking heating device and method based on semi-resonance and semi-radiation

Abstract

The invention relates to an asphalt road surface microwave response marking heating device and method based on semi-resonance and semi-radiation, the heating device comprises a microwave heating unit, the microwave heating unit comprises a microwave power supply, a microwave generator, a waveguide tube and a microwave cavity, and the heating device is characterized in that the bottom part of the microwave cavity is opened to form an opening area; the opening area is arranged in the middle area of the microwave cavity, the width of the opening area is 1 / 2-3 / 4 of the width of the bottom of the microwave cavity and is not smaller than 200 mm, and the length of the opening area is equal to the length of the bottom of the microwave cavity. Compared with the prior art, the road sign removing device can quickly and efficiently remove the road sign on the asphalt road surface.

Description

Technical Field

[0001] The invention belongs to the technical field of road engineering, and relates to a device and method for heating asphalt road surface microwave response markings based on semi-resonance and semi-radiation. Background Art

[0002] As infrastructure gradually ages and traffic volume continues to grow, the demand for road reconstruction and expansion continues to increase, placing higher demands on the quality of reconstruction and expansion projects. During reconstruction and expansion projects, road traffic markings need to be replaced frequently, and the traditional method of removing markings is usually achieved by forcefully destroying the adhesion between the markings and the road surface. This method is not only energy-intensive and inefficient, but also easily damages the road surface, resulting in a decrease in surface quality and affecting the overall aesthetics of the road surface. At present, in terms of microwave heating, most of its equipment is an indoor fully enclosed heating mode, and there is no microwave heating equipment suitable for road markings.

[0003] For example, Chinese patent application CN201811544211.6 provides a method for improving the uniformity of microwave heating and a dual-port microwave heating device thereof, including a microwave heating cavity, a microwave feeding source, and a microwave phase adjustment device arranged on both sides of the heating cavity; the microwave phase adjustment device is connected to the microwave feeding source through a radiator; the microwave heating cavity is a single-mode cavity used to reduce reflection by adjusting the size of the cavity and the position of the feed. However, this patent is only applicable to small or standardized heating scenarios, and because a single-mode cavity (standard waveguide) is used, although the heating uniformity can be improved, the size and mode limitations of the single-mode cavity make it difficult to adapt to large-sized or complex-shaped heating objects (such as road surface heating). Summary of the invention

[0004] The purpose of the present invention is to provide a semi-resonant and semi-radiative asphalt road surface microwave response marking heating device and method, so as to achieve rapid and efficient removal of asphalt road surface markings.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] In the first aspect, the present invention provides a semi-resonant and semi-radiative asphalt road surface microwave response marking heating device, comprising a microwave heating unit, wherein the microwave heating unit comprises a microwave power supply, a microwave generator, a waveguide and a microwave cavity, wherein the bottom portion of the microwave cavity is open to form an opening area, so that the microwaves transmitted through the waveguide can be radiated downward, and the opening area is arranged in the middle area of ​​the microwave cavity, and the width of the opening area is 1 / 2 to 3 / 4 of the width of the bottom of the microwave cavity and is not less than 200 nm, and the length is equal to the length of the bottom of the microwave cavity.

[0007] Furthermore, the inner wall of the microwave cavity is made of metal material, preferably, the metal material is copper or aluminum.

[0008] Furthermore, the height of the opening area from the asphalt road surface during operation is 5 to 25 mm.

[0009] Furthermore, the entire bottom area of ​​the microwave cavity is also filled with a low-loss-dielectric constant dielectric layer.

[0010] Furthermore, the low-loss dielectric constant dielectric layer is a ceramic-based composite material layer, and its thickness is 3 to 8 mm.

[0011] Furthermore, the dimensions of the microwave cavity satisfy:

[0012]

[0013] In the formula, f mnl is the microwave signal frequency, which is 2450±50MHz; c is the speed of light; μ is the magnetic permeability of the medium (referring to air); ∈ is the dielectric constant of the medium (referring to air); a, b, d are the length, width and height of the microwave cavity respectively; m, n, l are the mode numbers, which are all natural numbers, such as 1, 2, 3, 4, etc. By substituting m, n, l into the calculation formula, if the calculated frequency is at the microwave input signal frequency (i.e. f mnl ), it can be considered as an excitable mode, and its number is recorded as k. The more excited modes are, the better the heating uniformity is. For the heating device of the present invention, a, b, and d are not greater than 4000mm, 500mm, and 400mm, respectively. In order to obtain a microwave cavity that can achieve uniform heating of road markings, the k value is preferably greater than or equal to 200.

[0014] Furthermore, microwave suppressors are provided at the outer bottom of the microwave cavity near the edges of both sides of the opening area. The microwave suppressors can effectively absorb the microwave radiation that overflows except for the heated road markings, protecting the surrounding environment and operators from the effects of unnecessary microwave radiation.

[0015] Furthermore, the microwave heating unit also includes a cooling air duct arranged around the microwave generator and the waveguide.

[0016] Furthermore, the asphalt road surface microwave response marking heating device also includes a tractor for accommodating the microwave heating unit.

[0017] In a second aspect, the present invention provides a method for heating asphalt road surface microwave response markings based on semi-resonance and semi-radiation, which is based on the asphalt road surface microwave response marking heating device as described above, and the method is specifically:

[0018] S1, align the opening area of ​​the microwave heating unit with the mark line to be heated and maintain it at a set height, then move at a constant speed of 2 to 5 m / min;

[0019] S2, clearing the marking line after microwave heating in S1.

[0020] Preferably, in order to better cooperate with the microwave response heating removal effect of the heating device, some microwave response materials can be added to the conventional formula system during the marking process to better absorb microwaves and improve the heating effect. Exemplarily, the microwave response material can be carboxyl iron powder, graphite powder, etc.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1) Efficient and accurate microwave heating: The semi-resonant and semi-radiant microwave cavity design is adopted to achieve one-way penetrating heating of road markings. The semi-resonant and semi-radiant microwave cavity structure with one side open on the E side concentrates microwave energy on the surface of the road. At the same time, by optimizing the design of the dielectric layer, the microwave absorption effect is enhanced, the heating efficiency and accuracy are improved, and the precise heating depth of 5 to 25 mm can be achieved, which can realize efficient heating and removal of road markings, and the removal efficiency is as high as 99.9%.

[0023] 2) Effective environmental protection and safety: The equipped microwave suppressor effectively absorbs or suppresses microwaves leaking from the heating cavity, controlling the radiation to 5mW / cm 2 The following ensures that operators and the surrounding environment are not interfered by microwaves, while avoiding the impact of microwave signals on other electronic equipment, greatly improving the safety of equipment use.

[0024] 3) Advanced temperature control and heat dissipation system: The microwave generator and transmission system are cooled through cooling air ducts, which reduces the operating temperature of the microwave equipment by more than 30%, prevents equipment damage or performance degradation caused by overheating, and ensures the stability of the equipment in high-intensity operations. At the same time, the control and detection system can adjust the microwave power, fan power and heating time, and monitor the cavity and road surface temperature in real time through infrared temperature measurement equipment to ensure a stable and safe heating process.

[0025] 4) Flexible and convenient mobility: The equipment is powered by a tractor and can move at a constant speed of 2 to 5 m / min, which improves operational flexibility and construction efficiency. It is suitable for a variety of construction scenarios and meets complex road requirements.

[0026] 5) Optimized microwave cavity design: The cavity structure is made of highly conductive metal materials, and the design is optimized with the help of electromagnetic simulation software. The parameters of cavity size, material, and open surface are adjusted many times. The final cavity size is determined to be 2050mm (length) × 320mm (width) × 200mm (height), the cavity material is copper or aluminum, the opening width is not less than 200mm, and the bottom of the cavity is filled with 3-8mm ceramic-based composite materials as a dielectric layer, which can achieve the best resonant frequency and radiation characteristics.

[0027] In summary, the present invention provides an efficient, environmentally friendly, safe and convenient microwave heating method and equipment for asphalt pavement markings, which greatly improves the construction efficiency and heating effect, and provides a reliable technical guarantee for the removal of road markings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a longitudinal cross section of the heating device of the present invention;

[0029] Figure 2 It is a structural schematic diagram of a transverse cross section of the heating device of the present invention;

[0030] Figure 3 is a schematic top view of a heating device of the present invention;

[0031] Description of the markings in the figure:

[0032] 1- microwave power supply, 2- microwave generator, 3- waveguide, 4- microwave cavity, 5- opening area, 6- microwave suppressor, 7- cooling air duct, 8- control console, 9- tractor, 10- microwave heating unit. DETAILED DESCRIPTION

[0033] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the following implementation manners or examples, unless otherwise specified, functional components or structures are conventional components or conventional structures used in the art to achieve corresponding functions.

[0037] In order to achieve rapid and efficient removal of asphalt road surface markings, the present invention provides an asphalt road surface microwave response marking heating device based on semi-resonance and semi-radiation, including a microwave heating unit 10, wherein the microwave heating unit 10 includes a microwave power supply 1, a microwave generator 2, a waveguide tube 3 and a microwave cavity 4, wherein the bottom portion of the microwave cavity 4 is open to form an opening area 5, so that the microwave transmitted through the waveguide tube 3 can be radiated downward, and the opening area 5 is arranged in the middle area of ​​the microwave cavity 4, and the width of the opening area 5 is 1 / 2 to 3 / 4 of the width of the bottom of the microwave cavity 4, and is not less than 200 nm, and the length is equal to the length of the bottom of the microwave cavity 4.

[0038] In some specific implementations, the inner wall of the microwave cavity 4 is made of metal material. Preferably, the metal material is copper or aluminum.

[0039] In some specific implementations, the width of the opening area 5 is not less than 200 mm, and the height from the asphalt road surface during operation is 5 to 25 mm.

[0040] In some specific embodiments, the entire bottom area of ​​the microwave cavity 4 is also filled with a low-loss-dielectric constant dielectric layer.

[0041] Furthermore, the low-loss dielectric constant dielectric layer is a ceramic-based composite material layer, and its thickness is 3 to 8 mm.

[0042] In some specific embodiments, the size of the microwave cavity 4 satisfies:

[0043]

[0044] In the formula, f mnl is the microwave signal frequency, which is 2450±50MHz; c is the speed of light; μ is the magnetic permeability of the medium (referring to air); ∈ is the dielectric constant of the medium (referring to air); a, b, d are the length, width and height of the microwave cavity 4 respectively; m, n, l are the mode numbers, which are all natural numbers, such as 1, 2, 3, 4, etc. By substituting m, n, l into the calculation formula, if the calculated frequency is at the microwave input signal frequency (i.e. f mnl ), it can be considered as an excitable mode, and its number is recorded as k. The more excited modes are, the better the heating uniformity is. For the heating device of the present invention, a, b, and d are not greater than 4000mm, 500mm, and 400mm, respectively. In order to obtain a microwave cavity 4 that can achieve uniform heating of road markings, the k value should be greater than or equal to 200.

[0045] In some specific embodiments, a microwave suppressor 6 is further provided at the edge of the bottom of the microwave cavity 4 near the opening area 5. Preferably, when a plurality of microwave suppressors 6 are provided, the distance between two of the microwave suppressors 6 along the length direction is not greater than 1 m.

[0046] In some specific embodiments, the microwave heating unit 10 further includes a cooling air duct 7 arranged around the microwave generator 2 and the waveguide 3 .

[0047] In some specific embodiments, the asphalt road surface microwave response marking heating device further includes a tractor 9 for placing the microwave heating unit 10. At the same time, a control console 8 may also be provided, and the function of the control console 8 is to control the opening and closing of the microwave heating unit 10, etc. The specific control process of this part, as well as the structural components required to realize the control process, etc., belong to the common knowledge in the art and will not be described in detail here.

[0048] The above embodiments may be implemented individually or in any combination of two or more.

[0049] The above implementation is described in more detail below in conjunction with specific examples.

[0050] Embodiment 1:

[0051] In order to achieve rapid and efficient removal of asphalt road surface markings, the present invention provides an asphalt road surface microwave response marking heating device based on semi-resonance and semi-radiation, including a microwave heating unit 10, the microwave heating unit 10 includes a microwave power supply 1, a microwave generator 2, a waveguide 3 and a microwave cavity 4, the size of the microwave cavity 4 is 2050mm (length) × 320mm (width) × 200mm (height), the bottom part is open, forming an opening area 5 of 2050mm (length) × 200mm (width), so that the microwaves transmitted through the waveguide 3 can be radiated downward, and the opening area 5 is arranged in the middle area of ​​the microwave cavity 4.

[0052] In this embodiment, the inner wall of the microwave cavity 4 is made of metal copper. The height of the opening area 5 from the asphalt road surface during operation is controlled to be about 15 mm. The entire bottom area of ​​the microwave cavity 4 is also filled with a low-loss dielectric constant dielectric layer, which is a ceramic matrix composite material layer (such as a conventional commercially available alumina ceramic matrix composite material) in this embodiment, and its thickness is about 5 mm.

[0053] In addition, the microwave heating unit 10 further includes a cooling air duct 7 arranged around the microwave generator 2 and the waveguide 3. The cooling air duct 7 here adopts conventional methods in the art and can be used for the microwave generator 2, the waveguide 3, etc. in the microwave heating unit 10.

[0054] In order to facilitate movement, the asphalt road surface microwave response marking heating device also includes a tractor 9 for arranging the microwave heating unit 10.

[0055] In specific operation, the working process of the heating device of this embodiment is as follows: align the opening area 5 of the microwave heating unit 10 with the marking line to be heated and maintain it at a set height of about 15 mm, then move at a constant speed of 2 to 5 m / min, and then quickly remove the marking line after microwave heating. In order to improve the cleaning effect and efficiency, microwave response materials can be further introduced into the conventional formula when the marking line is made. In specific operation, for the marking line containing microwave response materials, it has been tested that at a moving speed of 2 m / s, the microwave response marking line can be heated from 15°C to 80°C, and the marking line removal efficiency is as high as 99.9%.

[0056] Embodiment 2:

[0057] On the basis of Example 1, in this embodiment, microwave suppressors 6 are further provided at the edges of both sides of the bottom of the microwave heating unit near the opening area 5. The microwave suppressor 6 can adopt an existing absorption-type suppressor, which converts microwave signals into heat energy through an absorbing material, thereby achieving signal attenuation. When a plurality of microwave suppressors 6 are provided, the microwave suppressors 6 can be arranged continuously or at intervals along the length direction. In this way, the microwave signal leaked from the heating cavity can be suppressed or absorbed, the surrounding environment and operators can be protected from unnecessary microwave radiation, and the interference of microwaves to other electronic equipment can be avoided. The microwave leakage of the device is less than 5mW / cm 2 .

[0058] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A microwave response marking heating device for asphalt road surface based on semi-resonance and semi-radiation, comprising a microwave heating unit, wherein the microwave heating unit comprises a microwave power supply, a microwave generator, a waveguide and a microwave cavity, characterized in that: The bottom portion of the microwave cavity is open to form an opening area, so that the microwaves transmitted through the waveguide can be radiated downward. The opening area is arranged in the middle area of ​​the microwave cavity, and the width of the opening area is 1 / 2 to 3 / 4 of the width of the bottom of the microwave cavity and is not less than 200 mm, and the length is equal to the length of the bottom of the microwave cavity.

2. The asphalt road surface microwave response marking heating device based on semi-resonance and semi-radiation according to claim 1 is characterized in that: The inner wall of the microwave cavity is made of metal material, and the metal material is copper or aluminum.

3. The asphalt road surface microwave response marking heating device based on semi-resonance and semi-radiation according to claim 1 is characterized in that: The height of the opening area from the asphalt road surface during operation is 5 to 25 mm.

4. The asphalt road surface microwave response marking heating device based on semi-resonance and semi-radiation according to claim 1 is characterized in that: The entire bottom of the microwave cavity is also filled with a low-loss-dielectric constant dielectric layer.

5. The asphalt road surface microwave response marking heating device based on semi-resonance and semi-radiation according to claim 4 is characterized in that: The low-loss dielectric constant medium layer is a ceramic-based composite material layer, and its thickness is 3 to 8 mm.

6. The asphalt road surface microwave response marking heating device based on semi-resonance and semi-radiation according to claim 1 is characterized in that: The dimensions of the microwave cavity satisfy: In the formula, f mnl is the frequency of microwave input signal; c is the speed of light; μ is the magnetic permeability of air; ∈ is the dielectric constant of air; a, b, d are the length, width and height of the microwave cavity respectively, in m; m, n, l are all mode numbers, which are natural numbers.

7. The asphalt road surface microwave response marking heating device based on semi-resonance and semi-radiation according to claim 6 is characterized in that: Substitute any m, n, and l into the calculation formula. If the calculated frequency value is f mnl If the value of m, n, and l is within the range of , the excitation mode corresponding to the value combination of m, n, and l is considered to be an excitable mode, and the number of excitable modes is defined as k, where k ≥ 200.

8. The asphalt road surface microwave response marking heating device based on semi-resonance and semi-radiation according to claim 1 is characterized in that: Microwave suppressors are also provided at the outer bottom of the microwave cavity near the edge positions on both sides of the opening area.

9. The asphalt road surface microwave response marking heating device based on semi-resonance and semi-radiation according to claim 1 is characterized in that: The microwave heating unit further comprises a cooling air duct arranged around the microwave generator and the waveguide; The asphalt road surface microwave response marking heating device also includes a tractor for arranging the microwave heating unit.

10. A method for heating asphalt road surface microwave response markings based on semi-resonance and semi-radiation, which is based on the asphalt road surface microwave response marking heating device according to any one of claims 1 to 9, characterized in that: The method is as follows: S1, align the opening area of ​​the microwave heating unit with the mark line to be heated and maintain it at a set height, then move at a constant speed of 2 to 5 m / min; S2, clearing the marking line after microwave heating in S1.

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